Patent ID: 7354253
Filing Date: 2008-04-08
Classification: F04C,F05C

Abstract:
1. An oil pump comprising: a base including an actuating chamber, a suction port, a delivery port, a suction passage for supplying oil to said suction port, a delivery passage into which said oil is delivered from said delivery port, and a bypass passage for communicating with said delivery passage and said suction passage; a rotor disposed rotatably in said actuating chamber for actuating a pump action to suck said oil in said suction passage from said suction port and to supply said oil to said delivery passage by way of said delivery port; and a flow control valve disposed in said base for returning an excessive oil from said delivery passage to said suction passage as a returning flow of oil by way of said bypass passage when a flow amount of oil is excessive in said delivery passage; and a corrosion-proof member having corrosion resistance, wherein said corrosion-proof member extends over less than half of the at least one of said suction passage and said bypass passage in a circumferential direction of a center line in a cross section which intersects said center line of one of said suction passage and said bypass passage at right angles and is circumferentially positioned in the at least one of said suction passage and said bypass passage to face the returning flow of oil.