| 摘要 |
When a first rotating shaft is rotationally driven, it rotates a first cylinder barrel splined thereto, and a second cylinder barrel and a valve block united with the first cylinder barrel. In accordance with these rotations, first pistons in first cylinders slide circumferentially on the inclined face of a first swash plate so that they are reciprocated axially in the first cylinder barrel, and second pistons in second cylinders slide circumferentially on the inclined face of a second swash plate so that they are reciprocated axially in the second cylinder barrel. Simultaneously with these reciprocations, a first change-over valve is switched in accordance with the rotations of the first rotating shaft, and a second change-over valve is switched in accordance with the relative rotations of the first rotating shaft and the second rotating shaft. Thus, a high-pressure liquid discharged from the second cylinders during forward strokes of the second pistons is supplied via a second common liquid passage into the first cylinders during backward strokes of the first pistons, and a low-pressure liquid discharged from the first cylinders during forward strokes of the first pistons is sucked via a first common liquid passage into the second cylinders during backward strokes of the second pistons.
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