| 摘要 |
A rotary fluid pressure device is disclosed of the type including housing means defining a fluid inlet (57) and a fluid outlet (61) and including some form of rotary fluid energy-translating displacement mechanism associated with the housing. In one embodiment of the invention, the displacement mechanism comprises a gerotor gear set (17) including a housing member (22), an internally-toothed ring (23), and an externally-toothed star (27). Included is a free-wheeling mechanism (71) having an engagement member (73) and an actuation means (81) operable to move the engagement member between first and second positions. In a first position, the engagement member (73) prevents rotational movement of the ring (23) and the star (27) has its normal and orbital rotational movement to define expanding (28) and contracting (29) fluid volume chambers. In a second position, the engagement member (73) permits the ring (23) to rotate freely and the star (27) and ring (23) rotate together such that the fluid volume chambers neither expand nor contract and no fluid is displaced from the displacement mechanism. |
