| 摘要 |
A crowned part (65) is provided to a flat surface (61a) of a low-pressure-side bush (61). The crowned part (65) is a section that has been crowned toward a cylinder chamber (55)-side end part from a start position that is further toward a backpressure space (64) than an oscillation center position (O). The oscillation center position (O) is the position at which, during the eccentric rotary motion of a piston (60), the interval between a blade (62) and the bush (61) is constant. |
