| 摘要 |
A first fluid pressure chamber 21 is provided in one of the swing directions of a cam ring 8 and a second fluid pressure chamber 22 is provided in the other direction, with a spring 17 for urging the cam ring 8 toward the second fluid pressure chamber 22. Within the cam ring 8, a rotor having a plurality of vanes 27 is eccentrically disposed. A metering orifice 136 is provided halfway on a discharge passage 135 of pressure fluid discharged from the pump, and a control vale is activated due to a pressure difference between the upstream and downstream sides of the metering orifice 136. A fluid pressure of the first fluid pressure chamber 21 is controlled by activation of the control valve 123. The second fluid pressure chamber 22 is shut off from the control valve 123 to introduce a pressure on the suction side at any time. To return the cam ring 8 in a direction of expanding a pump chamber 11, an internal pressure of the cam ring 8 is applied in the return direction
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