Patent ID: 9103343
Filing Date: 2015-08-11
Classification: F04C

Abstract:
1. A high-performance, variable speed oil pump for pumping oil in a variable speed internal combustion engine, comprising: an enclosed housing having side walls extending between a first end and a second end of said housing, wherein said first end has a single inlet defined by ends of said side walls for receiving oil from an oil reservoir and said second end has a single outlet for discharging oil to said internal combustion engine, wherein said inlet has a longitudinal axis; a pair of gears rotatably and matingly disposed within a pumping chamber of said housing for pumping oil from said inlet to said outlet, wherein said pumping chamber has a longitudinal axis; an inlet passageway extending from said inlet to an inlet side of said pumping chamber, wherein said inlet passageway has a longitudinal axis substantially parallel to said longitudinal axis of said pumping chamber and said longitudinal axis of said inlet, wherein said inlet has a substantially constant and consistently larger opening than said inlet passageway extending from said ends of said side walls to said inlet passageway, said inlet and said inlet passageway together forming a valve-less path from said ends of said side walls to said pumping chamber; an outlet passageway extending from an outlet side of said pumping chamber to said outlet, wherein said outlet is larger than said outlet passageway; and a pressure regulating circuit disposed within a bore in said housing redirects a portion of oil from said outlet side of said pumping chamber to said inlet passageway when the pressure differential between said outlet of said pumping chamber and said inlet side of said pumping chamber exceeds a predetermined level in order to increase the pressure on said inlet side of said pumping chamber and reduce or eliminate cavitation of oil in said oil pump.