HYDRAULIC AXLE DRIVE DEVICE

HYDRAULIC AXLE-DRIVE DEVICE

Hydraulic pump unit, hydraulic pump set, and working vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port block. The drain port is provided on a wall surface other than an opposing wall surface facing each other of the wall surfaces of said first and second assemblies when arranging the first and second assemblies so that the input ends of each pump shaft are directed in the same direction.

Tractor

A tractor of the present invention can reduce a manufacturing cost of a lift arm support body. The tractor is configured such that a lift arm is mounted on an upper portion of a transmission casing by way of a lift arm support body, the lift arm is hydraulically controllable by a hydraulic control valve by way of a hydraulic circuit body, and the hydraulic circuit body and the hydraulic control valve are fixed to the transmission casing as bodies separate from a lift arm support body.

Hydraulic transaxle

A transaxle (1), having a hydraulic drive unit (20) and a pair of left and right wheel support units (2L and 2R), is suspended from a vehicle frame so as to be turnable around a turning-center axis oriented in a fore-and-aft direction of a vehicle. The hydraulic drive unit (20) comprises: a pair of left and right hydraulic motors (23L and 23R) having respective left and right horizontal motor shafts (23b); a center section (22) formed therein with an oil passage for hydraulically connecting at least one of the hydraulic motors to a hydraulic pump, the center section having motor attachment surfaces onto which the hydraulic motors are attached; and a pair of left and right axle casings (2L and 2R) containing the respective hydraulic motors and supporting the respective motor shafts. The pair of wheel support units (30L and 30R), supporting respective left and right travel wheels (1L and 1R), are joined to respective outer ends of the left and right axle casings, and drivingly connected to ...

Transmission for a Working Vehicle and Vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed at a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

System of valve of regulation of oil pressure for hydrostatic transmissions

Dans ce système, un mécanisme de valve servant à la régulation de la pression de l'huile dans un circuit d'huile (13) raccordant une pompe hydraulique (11) et un moteur (12) d'une transmission hydrostatique (10), un piston différentiel (23) servant de valve de décompression pour augmenter progressivement la pression d'huile, comporte sur son côté situé à l'opposé au circuit d'huile une surface d'application de pression qui est plus grande que celle située sur le côté où se trouve ce circuit. Un passage d'huile étranglé (24) est prévu pour diriger l'huile sous pression dans le circuit situé vers la surface de plus grande étendue. Le piston est sollicité par un ressort (25) par l'intermédiaire d'un piston de commande (26). Un élément récepteur (27) pour le ressort et un élément d'arrêt (28) pour le piston de commande sont conçus de manière à pouvoir être réglés en position indépendamment l'un de l'autre. On peut ainsi régler dans un large éventail l'augmentation de la pression de l'huile. In this system, a valve mechanism for regulating the pressure of the oil in an oil circuit (13) connecting a hydraulic pump (11) and a motor (12) of a hydrostatic transmission (10), a differential piston (23) serving as a decompression valve to gradually increase the oil pressure, has on its side located opposite to the oil circuit a pressure application surface which is larger than that located on the side where this circuit is located. A throttled oil passage (24) is provided to direct pressurized oil through the circuit to the larger area. The piston is biased by a spring (25) via a control piston (26). A receiving element (27) for the spring and a stop element (28) for the control piston are designed so that they can be adjusted in position independently of each other. The increase in oil pressure can thus be regulated over a wide range.

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Hydraulic steering transaxle and hydraulic driving vehicle

A steering transaxle comprises: left and right drive shafts drivingly connected to respective steerable wheels; a differential gear unit differentially connecting the drive shafts to each other; a transaxle casing having an opening and incorporating the differential gear unit and the drive shafts; a cover for covering the opening of the transaxle casing; a variable hydraulic motor having a movable swash plate; a motor control mechanism for controlling the movable swash plate; and a hydraulic oil port for oil supply and delivery to and from the hydraulic motor, the hydraulic oil port being provided on the outside of the cover. The hydraulic motor is provided on the inside of the cover, and the motor control mechanism is provided on the outside of the cover.

Drive for tractor etc. with hydrostatic transmission

The drive comprises a variable displacement pump (15) which is driven by the driveshaft (17) and contains a first swash-plate (28) which can be angularly displaced from a neutral position steplessly in one direction or another. An hydraulic motor (16) with variable displacement is in fluid link with the pump such that it is driven by the pump. The hydraulic motor has a second swash-plate (29) steplessly displaceable from its neutral position into several angular positions. The hydraulic motor drives an output shaft (18) drivably coupled to the tractor wheels.

Transmission for a working vehicle and vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed with a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

TRACTOR

Production cost of a rear arm supporting body is reduced. A lift arm is installed on the upper part of a transmission case with the lift arm supporting body in between. The lift arm can be hydraulically controlled by a hydraulic control valve through a hydraulic circuit body. The hydraulic circuit body and the hydraulic control valve are separate bodies from the lift arm supporting body and fixed to the transmission case. © KIPO & WIPO 2007 ...

HYDRAULISCHE ACHSENANTRIEBSVORRICHTUNG

Pump unit

There is provided a pump unit including a housing, a first and a second pump shafts, a first and a second hydraulic pump main bodies, a first and a second trunnion type movable swash pates, and a first and a second transmission gears. The housing has an inlet port for introducing oil from the outside into its pump accommodating chamber, an oil passage for communicating between the pump accommodating chamber and its gear accommodating chamber, and a discharge port for taking out oil from the gear accommodating chamber to the outside. The pump accommodating chamber includes a supporting wall that supports each base end of the swash plates so that each operational end of the swash plates is directed to the opposite directions to each other. The inlet port and the oil passage are respectively provided at one side and the other side of the pump accommodating chamber with the supporting wall as a reference.

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

TRANSMISSION FOR VEHICLES OF WORK

Cette transmission contient une transmission hydrostatique qui comprend un moteur hydraulique (16) à cylindrée variable dont le plateau oscillant (29) est déplacé de sa position neutre, dans une seule direction et par paliers, vers plusieurs positions angulaires afin de définir des plages de vitesses élevées ou faibles pour le véhicule. Dans ces plages, on peut modifier la vitesse du véhicule de manière continue grâce à une pompe hydraulique (15) comportant un plateau oscillant (28) déplaçable de façon continue. L'arbre de sortie (18) du moteur est couplé aux roues arrière en permanence par un mécanisme (21) de transmission mécanique et aux roues avant de façon sélective par un mécanisme d'embrayage (26) comprenant de préférence un embrayage unidirectionnel.

Axle driving apparatus

An axle driving apparatus comprises a housing containing a pair of coaxial axles and a pair of stepless transmissions drivingly connected to the respective axles. The pair of stepless transmissions are symmetrically centered on a central point on the axis of the axles. In one embodiment, the central point of the axis is located in a gap between the axles.

Hydraulic four-wheel driving articulated vehicle

A hydraulic four-wheel driving articulated vehicle comprises: a first frame, on which first axles and a first hydraulic motor driving the first axles are mounted; a second frame, on which second axles and a second hydraulic motor driving the second axles are mounted, wherein the first and second frames are connected to each other so as to be relatively rotatable centering on a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, wherein the hydraulic circuit includes a passage interposed between the first and second hydraulic motors; and pressure control means for releasing oil from the passage between the first and second hydraulic motors when the first and second frames are relatively rotated by the steering operation of the stationary vehicle and backpressure oil discharged from the first and second hydraulic motors is excessively accumulated in the passage between the first ...

Hyrdaulic transmission

A hydraulic transmission comprises a hydraulic pump and a hydraulic motor, which are mounted onto a center section to be fluidly connected to each other through a closed fluid circuit formed in the center section. A neutral valve is connected to the closed fluid circuit. The neutral valve is fitted into an outward opened end of a vertical slanted oil hole of the closed fluid circuit. Alternatively, the neutral valve is fitted into an outward opened end of a straight oil hole having an opposite outward opened end into which a charge check valve is fitted.

Hydrostatic transmission and power train for vehicle

A hydrostatic transmission for vehicle interposed in a drive-power transmission path between a driving power source and a driving axle for non-stepwisely changing the speed of the vehicle includes an HST housing; a hydraulic pump unit having a pump shaft with first and second ends extending in a fore-aft direction of the vehicle away from each other; a hydraulic motor unit having a motor shaft for outputting the drive power from the motor shaft whose speed is non-stepwisely varied in cooperation with the hydraulic pump unit; a PTO unit having a PTO shaft extending in the fore-aft direction of the vehicle, the PTO shaft being operatively connected to the pump shaft; a charge pump unit for replenishing pressurized hydraulic fluid to a hydraulic circuit, the hydraulic circuit hydraulically connecting the hydraulic pump unit with the hydraulic motor unit, the charge pump unit including a charge pump body, and a charge pump case connected to the HST housing through its wall closer to the driving ...

Working vehicle comprising a hydrostatic transmission

A flywheel housing is partitioned by a partition wall disposed at an intermediate position in the lengthwise direction thereof to form a pair of housing portions in which a flywheel is accommodated in one housing portion, and an HST unit that receives power from the flywheel is installed in the other housing portion, the HST unit comprising an oil hydraulic motor, an oil hydraulic pump, an oil hydraulic circuit block containing an oil hydraulic circuit therein and supporting one end of an oil hydraulic motor shaft and one end of an oil hydraulic pump shaft, and a cover housing secured to the oil hydraulic circuit block to cover the oil hydraulic motor and the oil hydraulic pump and support the other end of the oil hydraulic motor shaft and the other end of the oil hydraulic pump shaft; the oil hydraulic circuit block being secured to the flywheel housing.

Getriebe für ein Arbeitsfahrzeug und Fahrzeug

Hydraulic fluid supply structure

There is provided a hydraulic fluid supply structure including: a discharge line fluidly connected to a discharge port of a hydraulic pump body and regulated to have a first pressure value; an external hydraulic fluid extraction line for supplying the hydraulic fluid to an actuator for raising and lowering a working machine, the external hydraulic fluid extraction line being fluidly connected to the discharge line through a resistance valve; a PTO hydraulic fluid line for supplying the hydraulic fluid to a hydraulic operating type clutch mechanism for engaging or disengaging power transmission to the working machine, the PTO hydraulic line being fluidly connected to the discharge line through a throttle valve and regulated to have a second pressure value lower than the first pressure value; and a PTO switching valve interposed in the PTO hydraulic fluid line so as to turn ON/OFF the supply of the hydraulic fluid to the hydraulic clutch mechanism. The PTO switching valve is configured to ...

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22a for receiving an input at its rear end, and a hydraulic motor ...

Transmission for a working vehicle and vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed at a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

Pump system and axle-driving system

A pump system includes a housing, an input shaft, a pump shaft; a hydraulic pump body, a PTO shaft, a power transmission gear train, and a PTO clutch mechanism. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears of the power transmission gear train, a PTO clutch accommodating space which surrounds the PTO clutch mechanism and which is fluidly communicated with the gear accommodating space, and a pair of first and second suction/discharge ports which communicate the internal space of the housing with an outside of the housing. The first suction/discharge port is arranged within the gear accommodating space so as to be positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween.

Öldruckregelventil-Baugruppe für hydrostatische Getriebe

Getriebe für ein Arbeitsfahrzeug und Fahrzeug

Hydraulische Vierradantriebsvorrichtung

Antriebsgetriebe für Arbeitsfahrzeuge

Antriebsgetriebe für Arbeitsfahrzeuge mit einem hydrostatischen Getriebe (14), umfassend: eine Antriebswelle (17), die durch einen Motor (3) angetrieben wird; eine Pumpe (15) mit variabler Verdrängung, die durch die Antriebswelle (17) angetrieben wird und eine erste Taumelscheibe (28) umfaßt, die aus ihrer neutralen Position stufenlos in der einen oder anderen Richtung winkelverstellt werden kann; einen Motor (16) mit variabler Verdrängung, der mit der Pumpe (15) derart in Fluidverbindung steht, daß er durch die Pumpe (15) angetrieben wird, wobei der Motor (16) eine in ihrer Winkelstellung verstellbare zweite Taumelscheibe (29) umfaßt; und eine Abtriebswelle (18), die durch den Motor (16) angetrieben wird und in Verbindung mit den Fahrzeugrädern (1, 2) steht; dadurch gekennzeichnet, daß die zweite Taumelscheibe (29) aus ihrer neutralen Position in einer Richtung stufenweise in mehrere Winkelstellungen gebracht werden kann und ein Feststellmechanismus (37) vorhanden ist, der betätigbar ist ...

TRAMSMISSION MECHANISM FOR VEHICLES HAVING HST AND PRESSURE OIL SUPPLY SYSTEM THEREFOR

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20 , and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic ...

Hydraulic pump unit, hydraulic pump set, and working vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port ...

Hydraulic Steering Transaxle and Hydraulic Driving Vehicle

A steering transaxle comprises: left and right drive shafts drivingly connected to respective steerable wheels; a differential gear unit differentially connecting the drive shafts to each other; a transaxle casing having an opening, the transaxle casing incorporating the differential gear unit and the drive shafts; a cover for covering the opening of the transaxle casing; a variable hydraulic motor having a movable swash plate, the hydraulic motor being provided on the inside of the cover; a motor control mechanism for controlling the movable swash plate, the motor control mechanism being provided on the outside of the cover; and a hydraulic oil port for oil supply and delivery to and from the hydraulic motor, the hydraulic oil port being provided on the outside of the cover.

Hydraulische Vierradantriebsvorrichtung

Hydraulic axle-drive device

A transaxle ( 1 ), having a hydraulic drive unit ( 20 ) and a pair of left and right wheel support units ( 2 L and 2 R), is suspended from a vehicle frame so as to be turnable around a turning-center axis oriented in a fore-and-aft direction of a vehicle. The hydraulic drive unit ( 20 ) comprises: a pair of left and right hydraulic motors ( 23 L and 23 R) having respective left and right horizontal motor shafts ( 23 b); a center section ( 22 ) formed therein with an oil passage for hydraulically connecting at least one of the hydraulic motors to a hydraulic pump, the center section having motor attachment surfaces onto which the hydraulic motors are attached; and a pair of left and right axle casings ( 2 L and 2 R) containing the respective hydraulic motors and supporting the respective motor shafts. The pair of wheel support units ( 30 L and 30 R), supporting respective left and right travel wheels ( 1 L and 1 R), are joined to respective outer ends of the left and right axle casings, ...

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

WORK VEHICLE EQUIPPED WITH A HYDROSTATIC TRANSMISSION FOR EASILY MOUNTING THE HST AND REDUCING POSSIBLE MALFUNCTIONS AFTER MOUNTING

PURPOSE: A work vehicle equipped with a hydrostatic transmission(HST) is provided to easily mount the HST, to decrease malfunctions after mounting, to introduce an excellent soundproof vehicle, and to preclude steel powder and sludge from infiltrating into operating oil. CONSTITUTION: A work vehicle(1) equipped with a hydrostatic transmission(HST) is composed of a cellular wall(14) formed in a longitudinal central unit of a flywheel housing(13); a pair of housing units sectioned in the flywheel housing by the cellular wall; a flywheel(2) accommodated in one side of the housing units; an HST unit(5) inserted into the other side of the housing units to receive power from the flywheel and formed with a hydraulic motor(10), a hydraulic pump(9), and a hydraulic circuit; a hydraulic circuit block(17) supporting one side of a shaft of the hydraulic motor and a shaft of the hydraulic pump; and a cover housing fixed to the hydraulic circuit block to cover the hydraulic motor and the hydraulic pump ...

Pump system and axle-driving system

A pump system includes a housing, an input shaft, a pump shaft; a hydraulic pump body, a PTO shaft, a power transmission gear train, and a PTO clutch mechanism. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears of the power transmission gear train, a PTO clutch accommodating space which surrounds the PTO clutch mechanism and which is fluidly communicated with the gear accommodating space, and a pair of first and second suction/discharge ports which communicate the internal space of the housing with an outside of the housing. The first suction/discharge port is arranged within the gear accommodating space so as to be positioned in an opposite side to the PTO clutch accommodating space with the mesh point between the first and second transmission gears interposed therebetween.

HYDROSTATISCHER KRAFTFAHRZEUGANTRIEB UND DAFÜR VORGESEHENE DRUCKQUELLE

Hydraulische Lenkung für ein vierradgetriebenes Knicklenker-Fahrzeug

Leistungsteilungs- und Wellenantriebseinrichtung für ein Arbeitsfahrzeug

Hydraulic transaxle and vehicle comprising it

A hydraulic transaxle comprises a transaxle casing for supporting left and right axles, a pair of hydraulic motors disposed in the transaxle casing so as to drive the respective left and right axles, hydraulic ports provided in the transaxle casing so as to fluidly connect the pair of hydraulic motors in parallel to a common hydraulic pump, and a system for restricting or canceling differential rotation of the pair of hydraulic motors.

Hydrostatic transmission

A hydrostatic transaxle comprises: a housing, an interior space of the housing serving as a fluid sump; an axle supported by the housing; a hydrostatic transmission disposed in the housing so as to drive the axle, the hydrostatic transmission including a hydraulic pump disposed in the housing, a hydraulic motor disposed in the housing, and a center section disposed in the housing, wherein the hydraulic pump and the hydraulic motor are mounted onto the center section, and wherein the center section is formed therein with a fluid circuit for circulation of fluid between the hydraulic pump and the hydraulic motor, and formed with an outwardly opened hole connected to the fluid circuit; a valve holding member fitted into the hole; and a relief valve connected to the fluid circuit through valve holding member. The relief valve is provided with a fixed flow restricting means for passing a specific amount of fluid from a higher-pressurized portion of the fluid circuit to a lower-pressurized portion ...

Hydraulische Lenkung für ein vierradgetriebenes Knicklenker-Fahrzeug

Hydrostatic transmission and power train for vehicle

A hydrostatic transmission for vehicle interposed in a drive-power transmission path between a driving power source and a driving axle for non-stepwisely changing the speed of the vehicle includes an HST housing; a hydraulic pump unit having a pump shaft with first and second ends extending in a fore-aft direction of the vehicle away from each other; a hydraulic motor unit having a motor shaft for outputting the drive power from the motor shaft whose speed is non-stepwisely varied in cooperation with the hydraulic pump unit; a PTO unit having a PTO shaft extending in the fore-aft direction of the vehicle, the PTO shaft being operatively connected to the pump shaft; a charge pump unit for replenishing pressurized hydraulic fluid to a hydraulic circuit, the hydraulic circuit hydraulically connecting the hydraulic pump unit with the hydraulic motor unit, the charge pump unit including a charge pump body, and a charge pump case connected to the HST housing through its wall closer to the driving ...

Tractor

A tractor of the present invention can reduce a manufacturing cost of a lift arm support body. The tractor is configured such that a lift arm is mounted on an upper portion of a transmission casing by way of a lift arm support body, the lift arm is hydraulically controllable by a hydraulic control valve by way of a hydraulic circuit body, and the hydraulic circuit body and the hydraulic control valve are fixed to the transmission casing as bodies separate from a lift arm support body.

Hydraulic transaxle and vehicle comprising it

A hydraulic transaxle comprises a transaxle casing for supporting left and right axles, a pair of hydraulic motors disposed in the transaxle casing so as to drive the respective left and right axles, hydraulic ports provided in the transaxle casing so as to fluidly connect the pair of hydraulic motors in parallel to a common hydraulic pump, and a system for restricting or canceling differential rotation of the pair of hydraulic motors.

Hydraulische angetriebene Achse und entsprechendes Fahrzeug

Hydraulic four-wheel driving articulated vehicle

A hydraulic four-wheel driving articulated vehicle comprises: a first frame, on which first axles and a first hydraulic motor driving the first axles are mounted; a second frame, on which second axles and a second hydraulic motor driving the second axles are mounted, wherein the first and second frames are connected to each other so as to be relatively rotatable centering on a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, wherein the hydraulic circuit includes a passage interposed between the first and second hydraulic motors; and pressure control means for releasing oil from the passage between the first and second hydraulic motors when the first and second frames are relatively rotated by the steering operation of the stationary vehicle and backpressure oil discharged from the first and second hydraulic motors is excessively accumulated in the passage between the first and second hydraulic motors.

Working vehicle comprising a hydrostatic transmission

A flywheel housing is partitioned by a partition wall disposed at an intermediate position in the lengthwise direction thereof to form a pair of housing portions in which a flywheel is accommodated in one housing portion, and an HST unit that receives power from the flywheel is installed in the other housing portion, the HST unit comprising an oil hydraulic motor, an oil hydraulic pump, an oil hydraulic circuit block containing an oil hydraulic circuit therein and supporting one end of an oil hydraulic motor shaft and one end of an oil hydraulic pump shaft, and a cover housing secured to the oil hydraulic circuit block to cover the oil hydraulic motor and the oil hydraulic pump and support the other end of the oil hydraulic motor shaft and the other end of the oil hydraulic pump shaft; the oil hydraulic circuit block being secured to the flywheel housing.

Nutzfahrzeug

Valve for regulating oil pressure in oil line in hydrostatic gearbox - has independently adjustable valve spring and pistons to vary rise in oil pressure.

The spring holder (27) holding one end of the valve spring (25) is set on the side opposite the control piston (26). A lock (28) extends through the spring holder and restricts the movement of the control piston (26) away from the stepped piston (23). The spring holder and lock can be moved independently of each other up to and away from the control piston (26). The force of the valve spring can be adjusted by changing the position of the spring holder. The stroke of the piston can be changed independently of this by changing the position of the lock. USE/ADVANTAGE - Valve for regulating oil pressure in oil line in hydrostatic gearbox gives smooth rises in oil pressure ensure smooth travelling. The rise in the oil pressure can be faster or slower depending on the inertia mass to be driven by the gearing.

Hyrdaulic Transmission

A hydraulic transmission comprises a hydraulic pump and a hydraulic motor, which are mounted onto a center section to be fluidly connected to each other through a closed fluid circuit formed in the center section. A neutral valve is connected to the closed fluid circuit. The neutral valve is fitted into an outward opened end of a vertical slanted oil hole of the closed fluid circuit. Alternatively, the neutral valve is fitted into an outward opened end of a straight oil hole having an opposite outward opened end into which a charge check valve is fitted.

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20 , and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Hydrostatic transmission and power train for vehicle

A hydrostatic transmission for vehicle interposed in a drive-power transmission path between a driving power source and a driving axle for non-stepwisely changing the speed of the vehicle includes an HST housing; a hydraulic pump unit having a pump shaft with first and second ends extending in a fore-aft direction of the vehicle away from each other; a hydraulic motor unit having a motor shaft for outputting the drive power from the motor shaft whose speed is non-stepwisely varied in cooperation with the hydraulic pump unit; a PTO unit having a PTO shaft extending in the fore-aft direction of the vehicle, the PTO shaft being operatively connected to the pump shaft; a charge pump unit for replenishing pressurized hydraulic fluid to a hydraulic circuit, the hydraulic circuit hydraulically connecting the hydraulic pump unit with the hydraulic motor unit, the charge pump unit including a charge pump body, and a charge pump case connected to the HST housing through its wall closer to the driving ...

Pump system

There is provided a pump system including; a base unit which has an input portion operatively connected to a driving source on a first end face and has a plurality of output portions capable of outputting a power transmitted from the input portion on a second end face at the opposite side of the first end face, the first end face capable of being directly or indirectly mounted on a support member; a pump unit which has a plurality of pump shafts driven by each of the plurality of output portions, a plurality of hydraulic pump bodies driven by each of the plurality of pump shafts, and a pump case surrounding the plurality of hydraulic pump bodies, the pump case being detachably connected to the second end face of the base unit; and a PTO unit which has a PTO shaft driven by the power transmitted from the input portion and is accommodated in the base unit.

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Wheel motor device

There is provided a wheel motor device including a hydraulic motor unit. The hydraulic motor unit includes a hydraulic motor main body, a motor shaft, a motor case and a port block. The port block includes a motor surface to which the motor case is connected, a pump surface to which a pump case surrounding a hydraulic pump main body is detachably connected so as to form a pump space for accommodating the hydraulic pump main body, and a pair of operational fluid passages fluidly connecting between the hydraulic motor main body accommodated in the motor space in a state of being contacted with the motor surface in a sliding manner around its axis line and the hydraulic pump main body accommodated in the pump space in a state of being contacted with the pump surface in a sliding manner around its axis line.

Hydrostatic transmission and power train for vehicle

A hydrostatic transmission for vehicle interposed in a drive-power transmission path between a driving power source and a driving axle for non-stepwisely changing the speed of the vehicle includes an HST housing; a hydraulic pump unit having a pump shaft with first and second ends extending in a fore-aft direction of the vehicle away from each other; a hydraulic motor unit having a motor shaft for outputting the drive power from the motor shaft whose speed is non-stepwisely varied in cooperation with the hydraulic pump unit; a PTO unit having a PTO shaft extending in the fore-aft direction of the vehicle, the PTO shaft being operatively connected to the pump shaft; a charge pump unit for replenishing pressurized hydraulic fluid to a hydraulic circuit, the hydraulic circuit hydraulically connecting the hydraulic pump unit with the hydraulic motor unit, the charge pump unit including a charge pump body, and a charge pump case connected to the HST housing through its wall closer to the driving ...

Load controller for hydrostatic transmission in work vehicles

Disclosed is a load controller for use in a hydrostatic transmission for a work vehicle. Power supplied from an engine is branched to drive an implement system and a traveling system. The hydrostatic transmission connects, in an oil-hydraulic closed circuit, an oil-hydraulic pump driven by the engine and an oil-hydraulic motor driven by the oil-hydraulic pump. The load controller includes a bypass oil line for bypassing an oil line that has high pressure during forward movement in the oil-hydraulic closed circuit to reach an oil line that has low pressure during forward movement or an oil tank; a first opening/closing valve for opening or closing the bypass oil line; and an opening/closing valve controller that detects a load applied to the engine while traveling during working and opens the first opening/closing valve when the load exceeds a predetermined level.

VANE PUMP

The purpose of the present invention is to provide a vane pump that is able to prevent decrease of power transmission efficiency when the vane pump is used in combination with a device such as a transmission device, for example. Therefore, this vane pump () has a hollow shaft (), the hollow shaft () is configured such that a hollow portion thereof allows a rotation driving shaft (which is, for example, an input shaft of a transmission device as illustrated in , and, which also includes an input shaft which is inserted directly into the transmission device from a driving source without having a coupling interposed therebetween) of the driving source () to be inserted therethrough, and the hollow shaft () and the rotation driving shaft () are coupled by means of a mechanism (spline, key and key groove, etc.) for transmitting a torque but transmitting no thrust. 1. A vane pump comprising a hollow shaft , whereinthe hollow shaft is constructed such that a rotation driving shaft of a driving source can be inserted into a hollow portion; andthe hollow shaft and the rotation driving shaft are connected by a mechanism for transmitting a torque but transmitting no thrust.2. The vane pump according to claim 1 , whereina rotor is mounted on said hollow shaft.3. The vane pump according to claim 2 , whereinsaid hollow shaft and the rotor are mounted such that relative rotation is not possible and movement in an axial direction is limited by a wire ring; andthe wire ring is disposed in a mode across a shaft-side recess portion and a rotor-side stepped portion in a state where the shaft-side recess portion formed on said hollow shaft and the rotor-side stepped portion formed on the rotor are aligned.4. The vane pump according to claim 1 , whereina mechanical seal is provided on both end portions in the axial direction of said hollow shaft; anda circuit for allowing the mechanical seals on the both end portions to communicate is formed.5. The vane pump according to claim 1 , ...

Hydrostatic transmission and power train for vehicle

A hydrostatic transmission for vehicle interposed in a drive-power transmission path between a driving power source and a driving axle for non-stepwisely changing the speed of the vehicle includes an HST housing; a hydraulic pump unit having a pump shaft with first and second ends extending in a fore-aft direction of the vehicle away from each other; a hydraulic motor unit having a motor shaft for outputting the drive power from the motor shaft whose speed is non-stepwisely varied in cooperation with the hydraulic pump unit; a PTO unit having a PTO shaft extending in the fore-aft direction of the vehicle, the PTO shaft being operatively connected to the pump shaft; a charge pump unit for replenishing pressurized hydraulic fluid to a hydraulic circuit, the hydraulic circuit hydraulically connecting the hydraulic pump unit with the hydraulic motor unit, the charge pump unit including a charge pump body, and a charge pump case connected to the HST housing through its wall closer to the driving axle for supporting the charge pump body; the PTO shaft having an one end closer to the driving axle, the one end extending outwardly through the HST housing to have an outer extension positioned outside of the HST housing; and the charge pump case being designed so as to bearing-support the outer extension of the PTO shaft.

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22a for receiving an input at its rear end, and a hydraulic motor ...

Transmission for a working vehicle and vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed at a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Axial piston device

There is provided an axial piston device that includes a housing, a rotary shaft, a cylinder block, and a piston. The housing includes a housing body opened at a first end thereof and a plate disposed at the first end of the housing body. The rotary shaft is rotatably supported about an axis by the housing body and the plate. The cylinder block is rotated together with the rotary shaft and is accommodated inside the housing. The piston is accommodated in the cylinder block in slidable a manner in an axial direction. Furthermore, the plate is provided with a pair of first oil passages having first ends communicating with a discharge port and a suction port of the cylinder block and second ends opened to the surface of the plate, and a drain oil passage for allowing at least one of the first oil passages to communicate with an oil sump. The drain oil passage is provided with a rotary valve which can selectively switch a shutoff position at which the drain oil passage is shut off and a communication ...

Pump system and pump unit

A pump system has a base unit and a pump unit. The base unit includes an input part operatively connected to a driving source and a plurality of output parts to which power is transmitted from the input part. The base unit is capable of being mounted to a support member. The pump unit includes a plurality of pump shafts respectively driven by the plurality of output parts, a plurality of hydraulic pump bodies respectively driven by the plurality of pump shafts, and a plurality of pump cases for respectively surrounding the plurality of hydraulic pump bodies, the pump unit detachably connected to the base unit. The pump shafts are connected to the corresponding output parts by connecting the pump cases to the base unit.

Hydraulic four-wheel driving apparatus

A hydraulic four-wheel driving apparatus is provided for a vehicle having a pair of left and right unsteerable wheels and a pair of left and right steerable wheels. The hydraulic four-wheel driving apparatus comprises: a transmission casing supporting the unsteerable wheels; a hydraulic pump disposed integrally with the transmission casing, the hydraulic pump being driven by a power source outside the transmission casing; a first hydraulic motor for driving the unsteerable wheels fluidly connected to the hydraulic pump, the first hydraulic motor being disposed integrally with the transmission casing; and a second hydraulic motor for driving the steerable wheels fluidly connected to the hydraulic pump, the second hydraulic motor being disposed integrally with the transmission casing and disposed on one side of the first hydraulic motor toward the steerable wheels.

Transmission for a working vehicle and vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed at a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

Power-dividing device and axle-driving device for a working vehicle

A power-dividing device for a working vehicle includes a case member, an input shaft supported by the case member so that a first end portion of the input shaft can be operatively connected to a driving source, a PTO unit having a PTO shaft supported by the case member so as to be offset with respect to the input shaft, a power transmission mechanism accommodated in the case member to transmit power from the input shaft to the PTO shaft, and a first pump unit having a first pump shaft operatively connected to the input shaft and being fluid-connected to an actuator disposed outside.

Pump system and pump unit

There is provided there is provided a pump system having a base unit and a pump unit. The base unit includes an input part operatively connected to a driving source and a plurality of output parts to which power is transmitted from the input part. The base unit is capable of being mounted to a support member. The pump unit includes a plurality of pump shafts respectively driven by the plurality of output parts, a plurality of hydraulic pump bodies respectively driven by the plurality of pump shafts, and a plurality of pump cases for respectively surrounding the plurality of hydraulic pump bodies, the pump unit detachably connected to the base unit. The pump shafts are connected to the corresponding output parts by connecting the pump cases to the base unit.

Wheel Motor Device

There is provided a wheel motor device including a hydraulic motor unit. The hydraulic motor unit includes a hydraulic motor main body, a motor shaft, a motor case and a port block. The port block includes a motor surface to which the motor case is connected, a pump surface to which a pump case surrounding a hydraulic pump main body is detachably connected so as to form a pump space for accommodating the hydraulic pump main body, and a pair of operational fluid passages fluidly connecting between the hydraulic motor main body accommodated in the motor space in a state of being contacted with the motor surface in a sliding manner around its axis line and the hydraulic pump main body accommodated in the pump space in a state of being contacted with the pump surface in a sliding manner around its axis line.

Hydraulic pump unit, hydraulic pump set, and working vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port ...

Hydraulic steering transaxle and hydraulic driving vehicle

A fluid passage member includes a pump mounting surface onto which a hydraulic pump having a rotary axis is mounted; first and second kidney ports opened at the pump mounting surface; a first fluid extraction port outwardly opened and connected to the first kidney port; a motor mounting surface onto which a hydraulic motor having a rotary axis is mounted so that the rotary axis of the hydraulic motor is parallel to the rotary axis of the hydraulic pump; third and fourth kidney ports opened at the motor mounting surface; and a second fluid extraction port outwardly opened and connected to the third kidney port.

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Hydraulic axle-drive device

A transaxle ( 2 ), having a hydraulic drive unit ( 20 ) and a pair of left and right wheel support units ( 2 L and 2 R), is suspended from a vehicle frame so as to be turnable around a turning-center axis oriented in a fore-and-aft direction of a vehicle. The hydraulic drive unit ( 20 ) comprises: a pair of left and right hydraulic motors ( 23 L and 23 R) having respective left and right horizontal motor shafts ( 23 b); a center section ( 22 ) formed therein with an oil passage for hydraulically connecting at least one of the hydraulic motors to a hydraulic pump, the center section having motor attachment surfaces onto which the hydraulic motors are attached; and a pair of left and right axle casings ( 2 L and 2 R) containing the respective hydraulic motors and supporting the respective motor shafts. The pair of wheel support units ( 2 L and 2 R), supporting respective left and right travel wheels ( 12 L and 12 R) are joined to respective outer ends of the left and right axle casings, and ...

Pump unit

There is provided a pump unit including a plurality of hydraulic pump bodies disposed in parallel to each other, a plurality of pump shafts respectively supporting the plurality of hydraulic pump bodies in a relatively non-rotatable manner and a pump housing accommodating the plurality of pump bodies and supporting the plurality of pump shafts in a rotatable manner around respective axis lines, wherein each of the plurality of pump shafts has at least one end extending outward from the pump housing so as to form an input end.

Neutral Valve Structure

There is provided a neutral valve structure applied to at least one of a pair of operation fluid lines in an HST, including: a valve body slidable in the axis line direction so as to take a closing position where the corresponding operation fluid line is liquid-tightly closed and a releasing position where the corresponding operation fluid line is released to a low-pressure area; and a biasing member for urging the valve body toward the releasing position on one side of the axis line direction. The valve body includes: a closing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the closing position on the other side of the axis line direction against the urging force of the biasing member; and a releasing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the releasing position on one side of the ...

Pump system and axle-driving system

There is provided a pump system including a housing capable of reserving oil in an internal space; an input shaft supported by the housing so as to be operatively connected to a driving source; a pump shaft supported by the housing; a hydraulic pump body which is accommodated in the housing and is driven by the pump shaft; a PTO shaft supported by the housing; a power transmission gear train which transmits a power from the input shaft to the pump shaft and the PTO shaft, and is accommodated in the housing; and a PTO clutch mechanism accommodated in the housing so as to be positioned in a power transmission path from the input shaft to the PTO shaft. The power transmission gear train has at least two first and second transmission gears meshed with each other. The housing has a narrow gear accommodating space surrounding a region including a mesh point between the first and second transmission gears, a PTO clutch accommodating space which surrounds the PTO clutch mechanism and which is fluidly ...

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Hydraulic pump unit, hydraulic pump set, and working vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port ...

Working vehicle comprising a hydrostatic transmission

A flywheel 2 and an HST unit 5 are accommodated in a flywheel housing 13 of a working vehicle, the HST unit 5 comprising an oil hydraulic motor 9 , an oil hydraulic pump 10 , an oil hydraulic circuit block 17 containing an oil hydraulic circuit therein and supporting one end of an oil hydraulic motor shaft and one end of an oil hydraulic pump shaft, and a cover housing 18 secured to the oil hydraulic circuit block to cover the oil hydraulic motor and the oil hydraulic pump and support the other end of the oil hydraulic motor shaft and the other end of the oil hydraulic pump shaft; the oil hydraulic circuit block 17 being secured to an intermediate housing connected to the flywheel housing 13.

Pump Unit

There is provided a pump unit including a plurality of hydraulic pump bodies disposed in parallel to each other, a plurality of pump shafts respectively supporting the plurality of hydraulic pump bodies in a relatively non-rotatable manner and a pump housing accommodating the plurality of pump bodies and supporting the plurality of pump shafts in a rotatable manner around respective axis lines, wherein each of the plurality of pump shafts has at least one end extending outward from the pump housing so as to form an input end.

Hydraulic transaxle and vehicle comprising it

A hydraulic transaxle comprises a transaxle casing for supporting left and right axles, a pair of hydraulic motors disposed in the transaxle casing so as to drive the respective left and right axles, hydraulic ports provided in the transaxle casing so as to fluidly connect the pair of hydraulic motors in parallel to a common hydraulic pump, and a system for restricting or canceling differential rotation of the pair of hydraulic motors.

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20 , and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Hydraulic Pump Unit, Hydraulic Pump Set, and Working Vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port ...

CONTROL VALVE UNIT FOR DISPLACEMENT CONTROL OF AGRICULTURAL MACHINE

PURPOSE: To eliminate necessity for any complicated link mechanism as well as to prevent any shock occurring when an agricultural machine changes its position, by setting up, a control valve in form of a spool valve and operating this spool valve by means of the rotation of a pulse motor so as to control the speed of spool displacement. CONSTITUTION: A control valve 2 is set up in form of a spool valve. This spool valve is so arranged as capable of making sliding motion following the rotation of a pulse motor 4. This pulse motor 4 is controlled by an electric controller 59 including a pulse generator. And this controller 59 outputs a control pulse of variable width and frequency. The spool valve is slowly controlled at the initial stage of displacement etc. by means of this control pulse, thus preventing shock(s) on the agricultural machine. COPYRIGHT: (C)1986,JPO&Japio ...

Working vehicle comprising a hydrostatic transmission

A flywheel housing 13 is partitioned by a partition wall 14 disposed at an intermediate position in the lengthwise direction thereof to form a pair of housing portions in which a flywheel 13 is accommodated in one housing portion 13 X, and an HST unit that receives power from the flywheel is installed in the other housing portion 13 Y, the HST unit 5 comprising an oil hydraulic motor 9, an oil hydraulic pump 10, an oil hydraulic circuit block 17 containing an oil hydraulic circuit therein and supporting one end of an oil hydraulic motor shaft and one end of an oil hydraulic pump shaft, and a cover housing 18 secured to the oil hydraulic circuit block to cover the oil hydraulic motor and the oil hydraulic pump and support the other end of the oil hydraulic motor shaft and the other end of the oil hydraulic pump shaft; the oil hydraulic circuit block 17 being secured to the flywheel housing.

Transmission mechanism of vehicle with HST and pressure oil feeding device for the mechanism

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20 , and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Working vehicle comprising a hydrostatic transmission

A flywheel housing 13 is partitioned by a partition wall 14 disposed at an intermediate position in the lengthwise direction thereof to form a pair of housing portions in which a flywheel 13 is accommodated in one housing portion 13 X, and an HST unit that receives power from the flywheel is installed in the other housing portion 13 Y, the HST unit 5 comprising an oil hydraulic motor 9 , an oil hydraulic pump 10 , an oil hydraulic circuit block 17 containing an oil hydraulic circuit therein and supporting one end of an oil hydraulic motor shaft and one end of an oil hydraulic pump shaft, and a cover housing 18 secured to the oil hydraulic circuit block to cover the oil hydraulic motor and the oil hydraulic pump and support the other end of the oil hydraulic motor shaft and the other end of the oil hydraulic pump shaft; the oil hydraulic circuit block 17 being secured to the flywheel housing.

Hydraulic Fluid Supply Structure

There is provided a hydraulic fluid supply structure including: a discharge line fluidly connected to a discharge port of a hydraulic pump body and regulated to have a first pressure value; an external hydraulic fluid extraction line for supplying the hydraulic fluid to an actuator for raising and lowering a working machine, the external hydraulic fluid extraction line being fluidly connected to the discharge line through a resistance valve; a PTO hydraulic fluid line for supplying the hydraulic fluid to a hydraulic operating type clutch mechanism for engaging or disengaging power transmission to the working machine, the PTO hydraulic line being fluidly connected to the discharge line through a throttle valve and regulated to have a second pressure value lower than the first pressure value; and a PTO switching valve interposed in the PTO hydraulic fluid line so as to turn ON/OFF the supply of the hydraulic fluid to the hydraulic clutch mechanism. The PTO switching valve is configured to ...

Pump system

There is provided a pump system including; a base unit which has an input portion operatively connected to a driving source on a first end face and has a plurality of output portions capable of outputting a power transmitted from the input portion on a second end face at the opposite side of the first end face, the first end face capable of being directly or indirectly mounted on a support member; a pump unit which has a plurality of pump shafts driven by each of the plurality of output portions, a plurality of hydraulic pump bodies driven by each of the plurality of pump shafts, and a pump case surrounding the plurality of hydraulic pump bodies, the pump case being detachably connected to the second end face of the base unit; and a PTO unit which has a PTO shaft driven by the power transmitted from the input portion and is accommodated in the base unit.

Hydraulic pump unit, hydraulic pump set, and working vehicle

There is provided a working vehicle having first and second hydraulic pump units operatively driven by a driving source and arranged away to each other in a width direction of the vehicle. In the working vehicle, each of the first and second hydraulic pump units includes a pump body; a port block formed with an oil passage for supplying/discharging an operating fluid to/from said pump body; a pump case connected to the port block so as to define a pump body accommodating space for surrounding the pump body; and a pump shaft for rotatably driving the pump body, the pump shaft having an input end operatively connected to said driving source. A drain port for opening the pump body accommodating space outward and a charge suction port for drawing in an oil from an oil tank in order to supply a charge oil to a hydraulic circuit fluidly connecting with the corresponding hydraulic motor unit are provided respectively in first and second assemblies formed by the corresponding pump case and port ...

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

Hydraulic steering transaxle and hydraulic driving vehicle

A steering transaxle comprises: left and right drive shafts drivingly connected to respective steerable wheels; a differential gear unit differentially connecting the drive shafts to each other; a transaxle casing having an opening, the transaxle casing incorporating the differential gear unit and the drive shafts; a cover for covering the opening of the transaxle casing; a variable hydraulic motor having a movable swash plate, the hydraulic motor being provided on the inside of the cover; a motor control mechanism for controlling the movable swash plate, the motor control mechanism being provided on the outside of the cover; and a hydraulic oil port for oil supply and delivery to and from the hydraulic motor, the hydraulic oil port being provided on the outside of the cover.

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission disposed between a differential gear unit and an HST and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST comprises a hydraulic pump having a pump shaft for receiving an input at its rear end, and a hydraulic motor having a motor shaft ...

Neutral valve structure

There is provided a neutral valve structure applied to at least one of a pair of operation fluid lines in an HST, including: a valve body slidable in the axis line direction so as to take a closing position where the corresponding operation fluid line is liquid-tightly closed and a releasing position where the corresponding operation fluid line is released to a low-pressure area; and a biasing member for urging the valve body toward the releasing position on one side of the axis line direction. The valve body includes: a closing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the closing position on the other side of the axis line direction against the urging force of the biasing member; and a releasing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the releasing position on one side of the ...

Tractor

Drive transmission for working vehicles

A vehicle drive transmission includes a hydrostatic transmission (14) which comprises a hydraulic motor (16) of a variable displacement type. Swash plate (29) of this motor is displaced from its neutral position in one direction in a stepwise manner to plural angular positions. The motor is used for setting one of plural speed ranges or low-speed and high-speed ranges of vehicle within which vehicle speed can be changed in a non-stepwise manner by a hydraulic pump (15) having a non-stepwisely displaceable swash plate (28). Output shaft (18) driven by the motor is connected to rear wheels (2) for a constant drive thereof through a mechanical transmission mechanism (21) and to front wheels (1) for a selective drive thereof through a clutch mechanism (26; 126; 226). The clutch mechanism preferably includes a one-way clutch (85) for providing a selective drive mode in which front wheels are additionally driven automatically when slipping of the rear wheels is caused during the two wheel-drive condition.

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

Axle driving apparatus

An axle driving apparatus comprises a housing containing a pair of coaxial axles and a pair of stepless transmissions drivingly connected to the respective axles. The pair of stepless transmissions are symmetrically centered on a central point on the axis of the axles. In one embodiment, the central point of the axis is located in a gap between the axles.

Oil pressure regulating valve system for hydrostatic transmissions

TRANSMISSION FOR WORKING VEHICLES

Hydraulic transaxle

A hydraulic transaxle (1), comprising: a pair of right and left motor shafts (23b); an axle casing (2,2R,2L) supporting the pair of motor shafts (23b), the axle casing (2,2R,2L) having an opening (60) at front or rear side thereof and formed therein with a chamber (S); and an assembly (120) including a cover (61; 91; 101) and a pair of hydraulic motors (23R,23L) fastened to the cover (61; 91; 101) for driving the respective motor shafts (23b), wherein the assembly (120) is attached to the axle casing (2,2R,2L) so as to install the pair of hydraulic motors (23R,23L) into the chamber (S) of the axle casing (2,2R,2L) through the opening (60), and to cover the opening (60) with the cover (61; 91; 101) so as to enclose the pair of hydraulic motors (23R,23L) by the axle casing (2,2R,2L) and the cover (61; 91; 101).

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Tramsmission mechanism for vehicles having hst and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20 , and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Hydraulic four-wheel driving apparatus

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Steering apparatus for a vehicle

A steering apparatus for a vehicle which is provided at part of a handle shaft of a handle with a steering mechanism so that a steering cylinder expands and contracts to perform hydraulic steering and, even when a hydraulic system is in trouble, the steering mechanism serves as a speed reduction mechanism, thereby enabling mechanical steering.

Hydraulic steering system for a four-wheel driven articulated vehicle

A hydraulic four-wheel driving articulated vehicle comprises: a first frame, on which first axles and a first hydraulic motor driving the first axles are mounted; a second frame, on which second axles and a second hydraulic motor driving the second axles are mounted, wherein the first and second frames are connected to each other so as to be articulated relatively about a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, wherein the hydraulic circuit includes a passage interposed between the first and second hydraulic motors; and pressure control means for releasing oil from the passage between the first and second hydraulic motors when the first and second frames are relatively rotated by the steering operation of the stationary vehicle and backpressure oil discharged from the first and second hydraulic motors is excessively accumulated in the passage between the first and second hydraulic motors.

Hydraulic steering system for a four-wheel driven articulated vehicle

A hydraulic four-wheel driving articulated vehicle comprises: a first frame, on which first axles and a first hydraulic motor driving the first axles are mounted; a second frame, on which second axles and a second hydraulic motor driving the second axles are mounted, wherein the first and second frames are connected to each other so as to be articulated relatively about a vertical axis by a steering operation; a hydraulic pump; a hydraulic circuit fluidly connecting the first and second hydraulic motors in series to the hydraulic pump, wherein the hydraulic circuit includes a passage interposed between the first and second hydraulic motors; and pressure control means for releasing oil from the passage between the first and second hydraulic motors when the first and second frames are relatively rotated by the steering operation of the stationary vehicle and backpressure oil discharged from the first and second hydraulic motors is excessively accumulated in the passage between the first and second hydraulic motors.

Axle driving apparatus

An axle driving apparatus comprises: a common housing; a pair of coaxial axles disposed in the housing; a common input shaft for receiving power from a prime mover, the common input shaft being extended perpendicular to the axles in the housing and passed through a gap between the axles; and a pair of stepless transmissions sharing power from the common input shaft, and transmitting power to the respective axles. The pair of stepless transmissions are arranged in the housing symmetrically centered on an axis of the common input shaft. The axle driving apparatus further comprises: a PTO shaft disposed coaxially to the common input shaft; a clutch disposed in the housing and interposed between the common input shaft and the PTO shaft; and a brake which is applied simultaneously to disengagement of said clutch so as to prevent inertial rotation of said PTO shaft.

Hydraulic steering system for a four-wheel driven articulated vehicle

Hydrostatic transmission and power train for vehicle

Hyrdaulic Transmission

A hydraulic transmission comprises a hydraulic pump and a hydraulic motor, which are mounted onto a center section to be fluidly connected to each other through a closed fluid circuit formed in the center section. A neutral valve is connected to the closed fluid circuit. The neutral valve is fitted into an outward opened end of a vertical slanted oil hole of the closed fluid circuit. Alternatively, the neutral valve is fitted into an outward opened end of a straight oil hole having an opposite outward opened end into which a charge check valve is fitted.

Hydraulic Steering Transaxle and Hydraulic Driving Vehicle

A steering transaxle comprises: left and right drive shafts drivingly connected to respective steerable wheels; a differential gear unit differentially connecting the drive shafts to each other; a transaxle casing having an opening, the transaxle casing incorporating the differential gear unit and the drive shafts; a cover for covering the opening of the transaxle casing; a variable hydraulic motor having a movable swash plate, the hydraulic motor being provided on the inside of the cover; a motor control mechanism for controlling the movable swash plate, the motor control mechanism being provided on the outside of the cover; and a hydraulic oil port for oil supply and delivery to and from the hydraulic motor, the hydraulic oil port being provided on the outside of the cover.

Working vehicle

In a working vehicle, a variable output HST and a planetary gear unit are connected with an engine, which is supported on a vehicle frame closer to a first side of a fore and aft direction of the vehicle in vibration free manner so as to together constitute a driving-side unit, which is integrally supported on the vehicle frame in vibration free manner. A transmission case of a transmission is fixedly supported on the vehicle frame closer to a second side of the fore and aft direction of the vehicle with a distance from the driving-side unit. An output element of the planetary gear unit is operatively connected with a wheel drive train of the transmission via a shaft coupling extending along the fore and aft direction of the vehicle.

Transmission for a Working Vehicle and Vehicle

A transmission for a working vehicle for transmitting drive power from an engine to a driving axle that includes: a flywheel including a flywheel body operatively connected with the engine and a flywheel housing for accommodating the flywheel body; a main-speed-change unit including a main-input shaft operatively connected with the engine via the flywheel body and a main-output shaft for outputting drive power to be transmitted to the driving axle; and a sub-speed-change unit including a sub-input shaft and a sub-output shaft, and disposed at a distance from the main-speed-change unit. The engine, the flywheel and the main-speed-change unit are integrally connected with each other so as to vibrate freely relative to a vehicle frame, and the main-output shaft of the main-speed-change unit is operatively coupled with the sub-input shaft of the sub-speed-change unit via a vibration-absorbing shaft coupling.

Transmission mechanism for vehicles having HST and pressure oil supply system therefor

A transmission mechanism and a pressure oil supply system therefor are provided for use in work vehicles provided with a work device externally of the body of the vehicle at longitudinal one side thereof, the transmission mechanism being simple in construction and serving to shorten the overall length of the vehicle while holding a transmission shaft interconnecting a PTO shaft and an input shaft for the work device close to a horizontal. A work vehicle provided with a work device in front of the vehicle body comprises a transmission 30 disposed between a differential gear unit 10 and an HST 20 and providing a travel cooperative mechanism, a PTO shaft projecting from the housing of the HST 20, and a PTO cooperative mechanism disposed in the housing for dividedly deriving power for the PTO shaft from the travel cooperative mechanism for the transmission of the power. The HST 20 comprises a hydraulic pump 22 having a pump shaft 22 a for receiving an input at its rear end, and a hydraulic motor 23 having a motor shaft 23 a for delivering a front wheel driving force and a rear wheel driving force from the front end and rear end thereof, respectively.

Hydraulische achsenantriebsvorrichtung

Axial piston device

There is provided an axial piston device with which a pair of first oil passages and a drain oil passage for allowing at least one of the first oil passages to communicate with an oil sump. The axial piston device includes a rotary valve rotated around its axis so as to take a shutoff position/a communication position at which the drain oil passage is respectively shut off and communicated. The rotary valve includes a main body, a small-diameter portion that is contracted with a step from the main body, a flange portion that is enlarged from the small-diameter portion with a step, and a communication groove formed on the outer peripheral surface of the main body. The communication groove is formed at the position in the circumferential direction so as to be fluidly shutoff with respect to an upstream-side drain oil passage of the drain oil passage when the rotary valve is positioned at the shutoff position, and fluidly connected to the upstream-side drain oil passage when the rotary valve is positioned at the communication position.

油圧式操向装置

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Pump system

There is provided a pump system including; a base unit which has an input portion operatively connected to a driving source on a first end face and has a plurality of output portions capable of outputting a power transmitted from the input portion on a second end face at the opposite side of the first end face, the first end face capable of being directly or indirectly mounted on a support member; a pump unit which has a plurality of pump shafts driven by each of the plurality of output portions, a plurality of hydraulic pump bodies driven by each of the plurality of pump shafts, and a pump case surrounding the plurality of hydraulic pump bodies, the pump case being detachably connected to the second end face of the base unit; and a PTO unit which has a PTO shaft driven by the power transmitted from the input portion and is accommodated in the base unit.