Patent ID: 7011069

Claim:
An oil supply system for an engine comprising: a pump body including an inlet port for suctioning a hydraulic oil in response to the rotation of a rotor driven by synchronizing with a crankshaft, a first outlet port for discharging the hydraulic oil and a second outlet port for discharging the hydraulic oil in response to the rotation of the rotor; a hydraulic-oil-delivery passage for delivering the hydraulic oil to a hydraulic-oil receiving unit; a first oil passage for delivering the hydraulic oil discharged out of the first outlet port to the hydraulic-oil-delivery passage; a second oil passage for delivering the hydraulic oil discharged out of the second outlet port to the hydraulic-oil-delivery passage; and a return hydraulic passage for returning the hydraulic oil discharged out of a hydraulic-pressure control valve including a valve body which is moved in response to the hydraulic pressure delivered to the hydraulic-oil-delivery passage, to at least either the inlet port or an oil pan, wherein the valve body divides a hydraulic-oil receiving portion for receiving the hydraulic oil in the hydraulic-pressure control valve into a first valve chamber and a second valve chamber, and when the hydraulic pressure oil delivered to the hydraulic-oil-delivery passage is in a predetermined value, the hydraulic oil discharged out of the second outlet port is delivered to the hydraulic-oil-delivery passage via the first valve chamber, and further when the hydraulic pressure delivered to the hydraulic-oil-delivery passage exceeds the predetermined value, the hydraulic oil discharged out of the second outlet port is delivered to the hydraulic-oil-delivery passage via the second valve chamber.