| 摘要 |
The control system for a hydraulic drive comprising linear or rotary motors (3, 4) operating a pump (2) comprises a first pair of control lines (23, 25) in one of the lines (6) linking the motors and pump. These are connected with cylinders (15, 17) containing pistons (19, 21). Backflow lines (8, 9) connected to the motors are fitted with a second pair of control lines (24, 26) which connect with second cylinders (16, 18) which contain second pistons (20, 22). Each pair of first and second pistons forms a control valve (11, 12) for the motors.
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