Vane pump
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United States of America Patent
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-
Feb 20, 2018
Grant Date -
Nov 17, 2016
app pub date -
Jan 19, 2015
filing date -
Jan 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A vane pump used as a fluid pressure source includes: a rotor that is rotationally driven; a plurality of vanes that are inserted into the rotor in a freely slidable manner; a cam ring at which tip-end portions of the vanes slides as the rotor rotates; a pump chamber that is defined between the adjacent vanes; a suction port that guides working fluid to the pump chamber; a discharge port through which the working fluid discharged from the pump chamber is guided; a groove-like notch that extends from an opening edge of the discharge port in an opposite direction from rotation direction of the rotor, and the notch has a gradient-changing portion at which a rate of change of opening area is decreased in the rotation direction of the rotor.
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