| 摘要 |
<p>The invention relates to a hydraulic motor device with a displacement selector (16) in at least two positions, methods of controlling said selector comprising a hydraulic control chamber (18) that can be supplied with fluid via a control conduit (20) and first opposing return means (17). The device comprises a braking system with a brake release chamber (38) and second opposing return means (39). The control conduit (20) can be connected to the brake release chamber (38) and the first return means (17) can be used to return the displacement selector (16) to its large displacement position when the pressure in the chamber drops below a first threshold value, while the second return means (39) return the braking means (36) to a braking position when the pressure in the brake release chamber drops below a second threshold value, which is lower than the first threshold value.</p> |
