VANE PUMP

To improve operation efficiency of a vane pump.SOLUTION: A vane pump 200 comprises: a plurality of vanes 103; a cam ring 4; a side plate 130 having a slide contact surface 30a with which one side surface of a rotor 2 is in slide contact; a suction port 31 that opens to the slide contact surface 30a; a discharge port 32 that opens to the slide contact surface 30a; and a first magnet 40 that generates a magnetic field that acts on the vanes 103. The vane 103 is made of a magnetic material or has a second magnet 41, and is pressed against an inner peripheral cam surface 4a by a centrifugal force generated by the rotation of the rotor 2 and a repulsive force that repels the first magnet 40 or a suction force that attracts the first magnet 40. The repulsive force or suction force is smaller in the order of a suction region 50, a transition region 52, and a discharge region 51, where in the suction region 50, the suction port 31 is provided and the volume of a pump chamber 6 expands; in the discharge region 51, the discharge port 32 is provided and the volume of the pump chamber 6 contracts; and in the transition region 52 is provided between the suction region 50 and the discharge region 51.SELECTED DRAWING: Figure 7 【課題】ベーンポンプの作動効率を向上させる。【解決手段】ベーンポンプ２００は、複数のベーン１０３と、カムリング４と、ロータ２の一方の側面が摺接する摺接面３０ａを有するサイドプレート１３０と、摺接面３０ａに開口する吸込ポート３１と、摺接面３０ａに開口する吐出ポート３２と、ベーン１０３に作用する磁場を発生させる第一磁石４０と、を備え、ベーン１０３は、磁性体で形成されまたは第二磁石４１を有し、ロータ２の回転により生じる遠心力と、第一磁石４０と反発する反発力または第一磁石４０と引き付け合う吸引力と、によって内周カム面４ａに押圧され、反発力または吸引力は、吸込ポート３１が設けられポンプ室６の容積が拡張する吸込領域５０、吐出ポート３２が設けられポンプ室６の容積が収縮する吐出領域５１、及び吸込領域５０と吐出領域５１の間の遷移領域５２において、吸込領域５０、遷移領域５２、及び吐出領域５１の順で小さい。【選択図】図７