| 摘要 |
PURPOSE:To easily obtain a drooping characteristic and to reduce the driving force of a pump by varying the cross-sectional area of a discharge side throttle passage by means of a control spool which is displaced in accordance with a jet pressure on the discharge side of a pressure working fluid. CONSTITUTION:The velocity of a fluid in a discharge passage 28 is increased with the increase in the speed of rotation of a pump rotor 14 and, at the same time, as a jet pressure is increased, a control spool 36 is displaced to a throttle member 38 side against the pressing force of a spring 39 due to the jet pressure which acts on a pressure receiving part 43. Thereby, the cylindrical part 41 of the control spool 36 makes a throttle passage 37 a throttling condition, increasing pressure difference across the throttle passage 37. The increase pressure difference across the throttle passage 37 causes a spool valve 31 to be displaced, increasing excessive flow which is bypassed to produce a desired drooping characteristic.
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