Vane pump
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United States of America Patent
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Jan 19, 2016
Grant Date -
Oct 24, 2013
app pub date -
Oct 20, 2011
filing date -
Oct 22, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A vane pump including a cam ring, a rotor, slits formed in the rotor, vanes inserted slidably into the slits, pump chambers defined by the vanes, back pressure chambers defined between respective base end portions of the vanes and the slits, back pressure grooves capable of communicating with the back pressure chambers as the rotor rotates, and connecting grooves connecting back pressure grooves that are adjacent in a circumferential direction of the rotor to each other, wherein a connecting groove that communicates with a back pressure groove positioned in a suction region formed above a rotary center of the rotor so as to suction a working fluid into the pump chambers is formed to have a larger passage sectional area than a connecting groove that communicates with another back pressure groove positioned in another suction region formed below the rotary center of the rotor.
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