Patent ID: 7363913

Claim:
A high-pressure pump for a fuel injection system of an internal combustion engine, the high-pressure pump having a multi-part pump housing comprising: a basic body portion adapted to rotatably support a drive shaft and a cylinder head connected to the basic body portion, a cylinder bore formed in the cylinder head, a pump piston guided displaceably in the cylinder bore, one end of the pump piston defining a pump work chamber in the cylinder bore, into which fuel is aspirated via an inlet valve upon an intake stroke of the pump piston and from which fuel is positively displaced upon a pumping stroke of the pump piston, the inlet valve having a pistonlike valve member with a head having a sealing face which cooperates with a valve seat for controlling the communication of the pump work chamber with a fuel inlet, the valve member being urged in a closing direction by a closing spring and by pressure prevailing in the pump work chamber and in an opening direction by pressure prevailing in the fuel inlet, the head of the valve member being disposed in the pump work chamber and protruding from the pump work chamber with a shaft adjoining the head, the closing spring being disposed outside the pump work chamber and engaging the shaft, the valve seat being formed on the cylinder head at a transition from the cylinder bore to an adjoining, smaller-diameter bore formed in the cylinder head; wherein the valve member, with its shaft, protrudes through the smaller-diameter bore into a further bore in the cylinder head remote from the pump work chamber; and wherein the closing spring is disposed in this further bore in the cylinder head.