| 摘要 |
PROBLEM TO BE SOLVED: To provide a vane pump capable of reducing noise.SOLUTION: In a vane pump in which a common pressure (suction pressure Pi) available in a suction port 43 is introduced and a suction-side back pressure port 45 is arranged that communicates with a base end of a slit 61 that houses a plurality of vanes 7 positioned in a suction area, a suction-side back pressure port pressure increasing means (control valve 2, etc.) is arranged that increases the pressure of the suction-side back pressure port 45 than the common pressure (suction pressure Pi) available in the suction port 43 when the number of rotations of a rotor 6 is a predetermined value &bgr; or lower. |
