High pressure fuel pump with mechanical pressure regulation

A high pressure fuel pump includes an inlet metering valve arranged to control a quantity of fuel delivered to the pumping chamber during retracting motion of the pumping plunger. The inlet metering valve includes a metering valve member movable between a closed position and an open position, movement of the metering valve member from the closed position to the open position defining a variable flow area that increases as the metering valve member moves from the closed position toward the open position. An actuator piston in an actuator bore is exposed to pressure in the common rail. The actuator piston is biased toward a first position corresponding to low pressure in the common rail and movable toward a second position corresponding to maximum pressure in the common rail. The actuator piston includes a valve stop that determines a metering position of the metering valve member.

Inlet Control Valve for High Pressure Fuel Pump

The disclosed inlet check valve is used in a high pressure fuel pump and is comprised of a valve member integrally connected to a valve stem which is coupled to an inlet valve armature. The valve member has a stroke along an axis between an open position and a closed position. An inlet valve solenoid generates a magnetic field in an inlet valve pole to attract the inlet valve armature and move the valve member from the open position to the closed position. In the open position, the valve member contacts an inlet valve stop and a gap greater than the stroke of the valve member is defined along the axis between the inlet valve armature and the inlet valve pole. In the closed position, an inlet valve seat mates with the valve member and an armature gap remains between the inlet valve armature and the inlet valve pole. 1. An inlet control valve for a high pressure fuel pump , said high pressure fuel pump having an inlet valve feed passage and a pumping chamber where a pumping plunger reciprocates between a pumping phase and a charging phase , said inlet control valve comprising:an inlet control valve arranged to control fluid flow from said inlet valve feed passage to said pumping chamber, said inlet valve including a disc-shaped valve member integrally connected to an inlet valve stem, said valve member having a stroke along an axis between an open position to a closed position, said valve stem coupled to an inlet valve armature;an inlet valve bias member biasing said valve member toward said open position;an inlet valve seat having an annular surface configured to mate with said valve member and defining a cylindrical bore, said cylindrical bore receiving said valve stem and guiding movement of the valve member between said open and closed positions, a first side of said valve member in communication with said inlet valve feed passage and a second side of said valve member in communication with said pumping chamber;an inlet valve stop facing said inlet valve seat and ...

Integrated Outlet Check Valve and Pressure Relief Valve

The disclosed integrated outlet check valve and pressure relief valve are used in a high pressure fuel pump including a pumping chamber and an outlet fitting defining an outlet passage to a common rail. The pressure relief valve comprises a movable pressure relief valve shuttle including a pressure relief valve surface configured to mate with a pressure relief valve seat in a closed position. The pressure relief valve shuttle moves from the closed position to an open position when pressure in the common rail exerts a force greater than the bias of a pressure relief valve spring. The pressure relief valve shuttle also includes an outlet check valve seat configured to mate with an outlet check valve ball in a closed position. The outlet valve ball moves from the closed position to an open position when pressure in the outlet passage is less than pressure in the pumping chamber. 1. An integrated outlet check valve and pressure relief valve for a high pressure fuel pump , said high pressure fuel pump having a pumping chamber where a pumping plunger reciprocates between a pumping phase and a charging phase and an outlet fitting defining an outlet passage to a common rail , said integrated outlet check valve and pressure relief valve comprising:a pressure relief valve shuttle movable between a closed position and an open position, said pressure relief valve shuttle having a pressure relief valve surface configured to mate with a pressure relief valve seat and an outlet check valve seat configured to mate with an outlet check valve ball;a pressure relief valve cup arranged concentrically about at least a portion of said pressure relief valve shuttle;a pressure relief valve spring comprising a conical disc spring arranged between said pressure relief valve shuttle and said pressure relief valve cup, said pressure relief valve spring biasing said pressure relief valve shuttle toward said closed position;a pressure relief valve support defining an outlet flow path and ...

High pressure fuel pump with mechanical pressure regulation