Vane pump with multiple control chambers
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United States of America Patent
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Jan 3, 2017
Grant Date -
Dec 24, 2015
app pub date -
Aug 31, 2015
filing date -
Dec 22, 2004
priority date (Note) -
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Abstract
A variable capacity vane pump for an automobile includes a pump control ring positioned within the housing to move about a pivot. A rotor is positioned within a cavity of the control ring such that a position of the control ring determines an offset between a center of the cavity and an axis of rotation of the rotor. A first control chamber is provided between the pump housing and a first outer surface of the control ring. The first outer surface is positioned on an opposite side of the control ring as the working fluid chambers within the cavity. A second control chamber is provided between the pump housing and a second outer surface of the control ring. A return spring biases the control ring toward a position of maximum volumetric capacity against the forces created by the pressurized fluid within the first and second control chambers.
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