| 摘要 |
<p>A fluid pump or motor (10, 110) has a stationary cylinder block (28), pistons (24), and a swash plate type mechanism (36) to link reciprocation of the pistons with rotation of a shaft (46, 146). A valve plate (66) rotates with the shaft (46, 146), and controls the flow of fluid between low and high pressure connections (18, 16; 22, 20) and ports (60) in the cylinder block (28), leading to the cylinder bores (26). The valve plate (66) is biased against the cylinder block (28) by an axially-movable but non-rotating balancing member (80), which contains balancing pistons (88), supplied with pressure from the ports (76, 78) in the valve plate (66) through passages (86). The reaction from the pistons (88) biases the member (80) against the valve plate (66). The balancing member (80) is also biased by the pressure from the high-pressure connection (16; 20) acting on a shoulder (96). </p> |
