Variable capacity vane pump with force reducing chamber on displacement ring
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United States of America Patent
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Nov 10, 2009
Grant Date -
Mar 19, 2009
app pub date -
Oct 25, 2005
filing date -
Oct 25, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A novel variable displacement vane pump is provided wherein pressurized working fluid is provided to a portion of the pump chamber to act on the outside of the capacity varying ring to substantially balance the force created by the high pressure working fluid inside the ring. As the resultant high pressure force acting on the pivoting pin is reduced, the movement of the displacement control ring is smoother, reducing undesirable hysteresis, the wear on the pin is reduced and the additional force required to move the ring to vary the volumetric displacement of the pump is less than would otherwise be needed, allowing the related control mechanisms to be smaller.
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