Patent ID: 8007248
Filing Date: 2011-08-30
Classification: F01M

Abstract:
1. An internal combustion engine including a mechanism compartment containing a rotatable member operable at a rotational speed related to engine speed, the member in operation creating fluid flow along a rotatable surface of the member; a variable displacement engine oil vane pump driven by the engine and associated with the mechanism compartment, the pump including: pumping chambers defined by slide vanes carried by a rotor rotatable in a housing for pumping engine oil from an inlet to a pressurized outlet; a displacement control for controlling displacement of the pumping chambers, the displacement control including: a cam ring in the housing pivotally connected to a wall of the housing by a pivot, the cam ring being internally engaged by the vanes; a control chamber defined by the cam ring and the housing wall; a control orifice for communicating control oil to the control chamber and operative to urge the cam ring in a direction to limit pump oil outlet flow as oil outlet pressure increases; a vent chamber generally opposite the control chamber and defined by the cam ring and the housing wall; a vent opening through the housing wall and communicating the vent chamber with the fluid flow along the rotatable surface; and means blocking the fluid flow beyond the vent opening and converting the momentum of the fluid flow into a static fluid pressure within the vent chamber that urges the cam ring in an oil flow increasing direction and thereby increases the pump outlet oil flow as the engine speed increases.