Patent ID: 6668801
Filing Date: 2003-12-30
Classification: F02M,F04B

Abstract:
In an internal combustion engine having a hydraulically-actuated electronically-controlled fuel injection system of the type including a fuel injector valving high pressure fluid in response to commands from an ECM to timely inject a metered quantity of fuel into the engine's combustion chamber; the injector in fluid communication with the outlet of a high pressure pump having an inlet in fluid communication with a low pressure pump; the improvement comprising:a high pressure pump having a housing and a plurality of piston bores within the housing; a piston within each piston bore having one end in contact with a formed shaft portion rotatable relative to the housing, each piston movable in its piston bore to uncover and cover a suction opening of set area and pump fluid at its opposite end through a discharge vent opening in the cylinder; a check valve at each discharge vent opening and each discharge vent opening in fluid communication with the pump outlet whereby the flow of fluid pumped by the pump is generally constant throughout the operating range of the pump.