Patent ID: 6053706
Filing Date: 2000-04-25
Classification: F04C

Abstract:
An oil pump for use in a vehicle engine, comprising:a rotary pump for pressurizing oil to be pumped to the engine, said rotary pump including a pump housing; anda movable piston positioned at least partially within the pump housing and cooperating with said rotary pump to facilitate metering of oil;wherein said rotary pump comprises an orifice therein for selectively receiving said pressurized oil, said movable piston comprises a solenoid-operated piston movable for selectively blocking said orifice, and the oil pump further comprises a metering chamber having first and second chamber portions separated by a diaphragm, said first chamber portion being selectively communicated with said orifice when the piston is moved away from the orifice, and said second chamber portion including an inlet and outlet for metering oil therefrom as the piston is stroked.