Patent ID: 6227167
Filing Date: 2001-05-08
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:an axial piston, high pressure pump having a plurality of piston bores circumferentially spaced about a longitudinal centerline of the pump; a piston within each cylinder having one end in contact with a swash plate rotatable relative to the cylinder, each piston axially movable in its piston bore to uncover and cover a transversely positioned suction slot of set area formed in the piston bore 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.