Patent ID: 6905317
Filing Date: 2005-06-14
Classification: F04C

Abstract:
1. An oil pump apparatus mounted on an engine block comprising: a body having a pump chamber, a suction port and a discharge port; a first rotor and a second rotor disposed in the pump chamber so as to be rotated by a shaft and rotate each other for pumping oil from the suction port to the discharge port; a regulator valve mechanism for regulating the pressure of oil discharged to portions of an engine, the regulator valve mechanism including a regulator valve member which moves in the direction being in parallel with rotation axes of the first and second rotors in response to the discharged oil pressure; and a discharge passage formed in the engine block so as to fluidly communicate with the discharge port, wherein the discharge port and the discharge passage are located to be opposite each other so that the regulator valve mechanism is adapted to be disposed in both the discharge port and the discharge passage, the regulator valve mechanism is adapted to be disposed inside of the body and a cylinder block of the engine block, and the regulator valve mechanism comprises a cylindrical housing including an inner space, an opening formed at one end thereof, a bottom portion at the other end thereof, a relief hole formed on the bottom portion, a spring urging the regulator valve member accommodated in the inner space so as to close the relief hole as well as a plug for closing the opening and having an exhaust hole, wherein the regulator valve mechanism projects into the discharge port and the bottom portion of the housing is accommodated in the discharge passage.