| 摘要 |
A hydraulic machine includes a valve plate, with first and second fluid port s in a surface thereof. A cylinder barrel is rotatably coupled to the valve plate. A plurality of cylinders is formed in the cylinder barrel, such that, as the barrel rotates, each cylinder is coupled to the first and second flui d ports, sequentially. First and second pressure relief ports are formed in th e surface of the valve plate between the first and second fluid ports at top- and bottom-dead-center, respectively. A cross-port bore is formed in the val ve plate, placing the first and second pressure relief ports in fluid communication with each other. As each cylinder rotates to top-dead-center, an opposite cylinder rotates to bottom-dead-center. The respective cylinders ar e coupled to the first and second pressure relief ports, such that differentia l pressure in the cylinders is equalized.
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