Robert Boschgmbh

Matthias Distel

Achim Koehler

Sascha Ambrock

Stefan Kieferle

Burkhard Boos

Jochen Aleker

Markus Nieslony

Alfons Schoetz

Falko Bredow

Waldemar Kiel

Karsten Ruth

Jaroslav Zivny

Ulrich Maier

A check valve having a valve housing inserted into a receptacle in which housing a pistonlike valve member is guided longitudinally displaceably and cooperating with a valve seat on the valve housing. The valve member is urged in the closing direction by a prestressed closing spring and in the opening direction by the pressure prevailing in an inlet, and the valve member is inserted into the valve housing from the side of the valve seat. The valve housing is embodied in one piece and is embodied as cup-shaped and has both a bottom and a jacket region that defines a recess. With the open end of its recess, the valve housing points out of the receptacle, and the valve seat is located on the bottom of the valve housing, facing away from the recess. With a shaft, the valve member protrudes through a bore in the bottom into the recess in which the closing spring is located.

Check valve for a high-pressure pump of a fuel injection system for an internal combustion engine

A high-pressure a radial piston fuel pump in which the intake valves are embodied as ball valves, which has an advantageous effect on the efficiency of the high-pressure fuel pump. Moreover, the production and assembly of the high-pressure fuel pump of the invention are simplified by the use of ball valves.

High-pressure fuel pump with a ball valve in the low-pressure inlet

Fuel injection system having a feed pump by which fuel is pumped out of a fuel tank to the intake side of a high-pressure pump pumps fuel into a reservoir as a function of engine operating parameters. A fuel metering device is provided for adjusting the fuel quantity pumped into the reservoir by the high-pressure pump. An electrically actuated blocking valve is disposed between the feed pump and the high-pressure pump, and by means of this valve the high-pressure pump can be disconnected completely from the feed pump. By means of the blocking valve, it can still be attained that no fuel is pumped by the high-pressure pump even if the fuel metering device does not provide complete sealing.

Fuel-injection device for an internal combustion engine

The fuel injection system has a high-pressure pump, by which fuel is pumped into a reservoir, with which injectors disposed on cylinders of the engine communicate. A feed pump pumps fuel out of a fuel tank to the high-pressure pump and a fuel metering device triggered by a control unit and disposed between the feed pump and the high-pressure pump controls the fuel quantity delivered to the high-pressure pump. The fuel metering device is formed by a clocking valve, which is opened and closed in pulse-width-modulated fashion by the control unit, and the fuel quantity delivered to the intake side of the high-pressure pump is proportional to the opening duration of the clocking valve.

Fuel injection system for an internal combustion engine

Growing community of inventors

Ostfildern, Germany

Matthias Distel