Patent ID: 9534597
Date: 2017-01-03
CPC Classifications: F01C,F04C

Claim:
1. A variable capacity vane pump for an automobile including a drivetrain in receipt of a fluid pressurized by the pump, the pump comprising: a pump housing; a pump control ring including a cavity and positioned within the housing to move about a pivot; a vane pump rotor positioned within the cavity of the pump control ring, wherein a position of the pump control ring determines an offset between a center of the pump control ring cavity and an axis of rotation of the vane pump rotor; vanes being driven by the rotor and engaging a surface of the pump control ring that surrounds the cavity, the vanes and the surface at least partially defining working fluid chambers; a first control chamber between the pump housing and a first outer surface of the pump control ring, the first outer surface of the pump control ring being positioned on an opposite side of the pump control ring as the working fluid chambers, the first control chamber operable to receive pressurized fluid to create a force to move the pump control ring to reduce a volumetric capacity of the pump; a second control chamber between the pump housing and a second outer surface of the pump control ring, the second outer surface of the pump control ring being positioned on an opposite side of the pump control ring as the working fluid chambers, the second control chamber operable to receive pressurized fluid to create a force to move the pump control ring to reduce the volumetric capacity of the pump; and a return spring biasing the pump control ring toward a position of maximum volumetric capacity, the return spring acting against the forces created by the pressurized fluid within the first and second control chambers.