| 摘要 |
PROBLEM TO BE SOLVED: To provide a vane pump which prevents a leakage of an operating fluid from between the end of a vane and the inner peripheral surface of a pump chamber, and also prevents wear caused by excessive sliding resistance applied to the vane when changing the rotating speed of a rotor. SOLUTION: The vane pump comprises: the rotor 3 enclosed in the pump chamber 2; a plurality of vanes 4 retractably provided at the rotor 3; a working chamber 5 surrounded by the inner surface of the pump chamber 2, the outer peripheral surface of the rotor 3 and the vanes 4 and changed in volume by the rotational driving of the rotor 3; a suction port part 6 allowing the operating fluid to flow into the working chamber 5 in a volume enlarging process; and a discharge port part 7 discharging the operating fluid from the working chamber 5 in a volume reducing process. The end part, coming in sliding contact with the inner peripheral surface 2a of the pump chamber 2, of each vane 4 is composed of a permanent magnet. An electromagnet 9 generating magnetic force for attracting the end part of each vane 4 composed of the permanent magnet is provided on the outside in the radial direction of the rotor 3 rather than each vane 4. COPYRIGHT: (C)2008,JPO&INPIT
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