VARIABLE DISPLACEMENT PUMPS AND VANE PUMP CONTROL SYSTEMS
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United States of America Patent
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Issued Date -
Nov 25, 2010
app pub date -
May 20, 2010
filing date -
May 20, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A vane pump assembly is provided having a rotor, a plurality of vanes, first and second pistons, at least one fluid passageway, a spring, and an activator. The plurality of vanes adjustably extend from the rotor. The moveable stator ring encircles the rotor and is configured to affect fluid flow when located in offset and non-offset positions relative to the rotor. At least one of the vanes is configured to selectively engage the rotor when the stator ring is located in the offset position to move fluid engaging the vane. The first and second pistons oppose each other and are configured to act on the stator ring to move the stator between offset and non-offset positions relative to the rotor. At least one fluid passageway is in fluid communication with the first piston. The spring is configured to move the second piston. The activator is configured to selectively initiate or cease fluid flow from the vane pump. The spring is configured to move the second piston to move the stator ring to the offset position to create fluid flow by the vanes.
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