Patent ID: 7571713
Filing Date: 2009-08-11
Classification: F02M,F04B

Abstract:
1. In a high-pressure pump for a fuel injection system of an internal combustion engine, the pump having at least one pump element including a pump piston driven in a reciprocating motion and guided displaceably in a cylinder bore of a pump housing part which piston defines a pump work chamber in the cylinder bore that can be filled with fuel from a fuel inlet via a suction valve in the intake stroke of the pump piston the suction valve having a pistonlike valve member which cooperates with a valve seat to completely close off communication of the pump work chamber from the fuel inlet, the valve member being urged in the opening direction by the pressure prevailing in the fuel inlet and to its closed position by the pressure prevailing in the pump work chamber, the valve member having a cylindrical shaft and a head of larger cross section compared to the shaft with at least the shaft of the valve member being guided displaceably in a guide bore of a valve housing, the improvement comprising guide portions embodied on the head of the valve member and guided displaceably in a bore of the valve housing, the guide portions being spaced apart from one another in the circumferential direction, and flowthrough portions of reduced cross section compared to the guide portions on the head of the valve member between the guide portions, by means of which flowthrough portions, a fuel flow out of the fuel inlet into the pump work chamber is enabled.