Patent ID: 7290991

Claim:
An engine oil pump assembly comprising: a housing defining an interior cavity and including a common inlet for receiving oil from an external reservoir, first and second outlets for supplying pressurized oil for lubrication of separate external mechanisms with return to the external reservoir, and a common internal reservoir disposed within the housing; a shaft extending longitudinally though the housing and having an external drive; a first pump mechanism driven by the shaft and communicating with the common inlet and the first outlet of the housing; a second pump mechanism driven by the shaft and communicating with the common inlet and the second outlet of the housing; a first pressure relief valve connected to receive oil from the first pump mechanism and to limit pressure to the first outlet by discharging excess oil flow to the common internal reservoir; a second pressure relief valve connected to receive oil from the second pump mechanism and to limit pressure to the second outlet by discharging excess oil flow to the common internal reservoir; and the common internal reservoir connected to supply supplemental inlet oil to the first and second pump mechanisms.