Patent ID: 6364631
Filing Date: 2002-04-02
Classification: F02M,F04B

Abstract:
A pump system for supplying high-pressure fluid to a hydraulically-actuated fuel injection system of an internal combustion engine having a crankshaft, a high pressure rail for receiving high pressure fluid and supplying it to hydraulically powered fuel injectors, and internal fluid passageways, said pump system comprising:a pump having a housing and an annular flange surrounding a portion of said crankshaft, a low pressure fluid inlet port, a wobble plate within said housing rotatable about a central axis to raise the pressure of fluid within said housing, and a high pressure fluid outlet port; said pump mounted directly to, and with said annular flange abutting, said engine with said inlet and outlet ports being surrounded by said annular flange and in direct communication with a first and a second one of said internal fluid passageways, respectively; a rail pressure control valve physically separated and spaced from said pump and having an inlet communicating directly with said second fluid passageway, a first outlet communicating with said high pressure rail, and a second outlet; and a fluid reservoir physically separated and spaced from both said pump and said rail pressure control valve and having an inlet communicating with said rail pressure control valve second outlet to receive from said rail pressure control valve fluid in excess of that required to maintain the pressure of fluid in said high pressure rail at a desired level.