| 摘要 |
Two hydraulic units, each operable as a pump or hydraulic motor, have coaxial shafts in end-to-end relationship which can be coupled and disengaged from each other by a coupling. Valve means hydraulically connect the two units, so that a single unit can be operated as a pump or motor, that both units can be simultaneously operated as pumps or motors, and so that the two units can form a hydrostatic transmission in which one unit operates as a pump driven by a prime mover, and the other unit operates as a hydraulic motor.
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