| 摘要 |
A hydraulic control device to vary the displacement of a hydraulic piston unit, such as pump or motor, in function of the operating pressure, is provided with a pilot-operated servo piston. The pilot system comprises a sensing piston responsive to the operating pressure actuating a pilot piston and a force exerting member acting at an angle to the direction of movement of the sensing piston, the sensing piston and force exerting member acting on a movable bearing. The pilot piston is hydraulically and the movable bearing mechanically, e.g. by a coupling lever, connected to the main piston.
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