Vane pump device

Abstract

A vane pump includes: a rotor configured to rotate under rotational force from a rotary shaft while supporting multiple vanes and including a curved surface portion with an arc shape centered on the rotary shaft and a rotor recess depressed from the curved surface portion toward a rotation center; a cam ring disposed so as to surround the rotor and including an inner peripheral surface facing the curved surface portion of the rotor; and an inner plate disposed on one end of the cam ring in an axial direction of the rotary shaft so as to cover an opening of the cam ring and including a suction inner recess depressed toward the rotation center relative to the curved surface portion of the rotor.

1 . A vane pump device comprising:
 a rotor configured to rotate under rotational force from a rotary shaft while supporting a plurality of vanes, the rotor including a curved surface portion with an arc shape centered on the rotary shaft, the rotor including a first recess depressed from the curved surface portion toward a rotation center;   a cam ring disposed so as to surround the rotor, the cam ring including an inner peripheral surface facing the curved surface portion of the rotor; and   a one side member disposed on one end of the cam ring in an axial direction of the rotary shaft so as to cover an opening of the cam ring, the one side member including a second recess depressed toward the rotation center relative to the curved surface portion of the rotor.   
     
     
         2 . The vane pump device according to  claim 1 , wherein
 the one side member includes an inner portion that constitutes a portion of a suction port on a side thereof closer to the rotation center, the suction port being configured to suction a working fluid into a pump chamber defined by an outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes of the plurality of vanes, and   the second recess is a portion that is a part of the inner portion and depressed toward the rotation center.   
     
     
         3 . The vane pump device according to  claim 2 , wherein
 the inner portion of the one side member comprises a portion that is contoured to a shape of the curved surface portion of the rotor, and   a portion of the inner portion between the portion contoured to the shape of the curved surface portion and the second recess is contoured to a shape of the inner peripheral surface of the cam ring.   
     
     
         4 . The vane pump device according to  claim 2 , wherein
 the second recess of the one side member is formed at a downstream portion of the inner portion in a circumferential direction.   
     
     
         5 . The vane pump device according to  claim 2 , wherein
 the second recess of the one side member is formed substantially at a center of the inner portion in a circumferential direction.   
     
     
         6 . The vane pump device according to  claim 1 , wherein
 the second recess of the one side member is formed over an entire region of a portion of a suction port on a side thereof closer to the rotation center, the suction port being configured to suction a working fluid into a pump chamber defined by an outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes of the plurality of vanes.   
     
     
         7 . The vane pump device according to  claim 1 , wherein
 the cam ring includes a third recess depressed in an axial direction of the rotary shaft from a mating surface of the cam ring for mating with the one side member, the third recess being configured to constitute a suction port, the suction port being configured to constitute a suction path through which a working fluid is suctioned into a pump chamber defined by an outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes of the plurality of vanes, and   the first recess of the rotor is formed at a portion of the rotor facing the third recess of the cam ring.   
     
     
         8 . The vane pump device according to  claim 7 , wherein
 a size of the first recess of the rotor in the axial direction of the rotary shaft is smaller than a size of the third recess of the cam ring in the axial direction of the rotary shaft.   
     
     
         9 . The vane pump device according to  claim 1 , wherein
 the one side member includes an inner portion that constitutes a portion of a discharge port on a side thereof closer to the rotation center, the discharge port being configured to discharge a working fluid from a pump chamber defined by an outer peripheral surface of the rotor, the inner peripheral surface of the cam ring, and two adjacent vanes of the plurality of vanes, and   the second recess is a portion that is a part of the inner portion and depressed toward the rotation center.