| 摘要 |
PROBLEM TO BE SOLVED: To provide a vane pump providing reduced pulsation and impulsive sound by minimizing a pressure difference of pressurized oil delivered from both delivery ports. SOLUTION: This vane pump is provided with a cam ring 18 arranged in a body 16, a rotor 4 rotatably stored in the cam ring 18, a pair of high-pressure parts 15a, 15b wherein chambers partitioned by vanes 5 protruding from the rotor 4 become high pressure, and a pair of delivery ports 13a, 13b formed in a side plate 11 and communicating with the high pressure parts 15a, 15b. The body 16 is provided with a driving mechanism circumferentially rotating the cam ring 18 according to differential pressure between the pair of delivery ports 13a, 13b. When the differential pressure is generated between the pair of delivery ports 13a, 13b, the driving mechanism is operated according to the differential pressure, and also the cam ring 18 is circumferentially rotated by operation of the driving mechanism, thereby varying a relative positional relationship between the pair of high-pressure parts 15a, 15b and the pair of delivery ports 13a, 13b. COPYRIGHT: (C)2008,JPO&INPIT
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