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Vane Pump

  • US 20130251571A1
  • Filed: 02/14/2013
  • Published: 09/26/2013
  • Est. Priority Date: 03/22/2012
  • Status: Active Grant
First Claim
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1. A vane pump comprising:

  • a rotor rotatably driven by a drive shaft, the rotor having a plurality of slits formed on an outer periphery of the rotor;

    a plurality of vanes, each of the vanes being housed in a corresponding one of the slits in a manner of being capable of protruding from, and retracting in, the slit and having both end faces formed into curved surfaces in a plane perpendicular to a rotational axis of the rotor;

    a cam ring oscillatably disposed so as to surround the rotor;

    a pump body for housing therein the cam ring, the rotor, and the vanes, the pump body having a surface disposed to face axial side surfaces of the cam ring and the rotor, the surface forming, in addition to the cam ring, the rotor, and the vanes, a plurality of pump chambers thereon, the surface havinga suction port communicating with a suction zone in which each of the pump chambers has a volume that increases with rotation of the rotor,a suction side back pressure port introducing pressure common to that of the suction port and communicating with proximal end portions of the slits that house the vanes positioned in the suction zone,a discharge port communicating with a discharge zone in which each of the pump chambers has a volume that decreases with rotation of the rotor, anda discharge side back pressure port introducing pressure common to that of the discharge port and communicating with proximal end portions of the slits that house the vanes positioned in the discharge zone;

    a recess formed in an end portion of the rotor axially opposite to the surface in which the suction side back pressure port and the discharge side back pressure port are formed;

    a vane cam disposed in the recess such that an outer peripheral surface thereof contacts the proximal end portions of all vanes to thereby forcedly make the vanes protrude and retract, the vane cam being movable so as to vary an amount of eccentricity relative to the drive shaft; and

    a cam port formed in a surface of the pump body on a side in abutment with the vane cam, the cam port communicating with the recess in the rotor in which the vane cam is housed,wherein the vane cam partitions the proximal end portions of the slits that house the vanes positioned in the suction zone from the proximal end portions of the slits that house the vanes positioned in the discharge zone.

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