DIRECT CONTROL LINEAR VARIABLE DISPLACEMENT VANE PUMP
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United States of America Patent
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Issued Date -
Apr 19, 2012
app pub date -
Feb 23, 2010
filing date -
Mar 5, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A fluid pumping system for a power transmission device includes a variable displacement vane pump having a housing containing a rotor, a plurality of vanes coupled to the rotor and a linearly translatable slide for varying the displacement of the pump. A control system varies the displacement of the pump and provides a fluid output pressure selected from a continuously variable range of output pressures which are independent from the operating speed of the pump. The control system includes a linear actuator for moving the slide between minimum and maximum pump displacement positions. The linear actuator includes an electric stepper motor for bi-directionally translating an actuator shaft acting on the slide.
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