| 摘要 |
<p>A shift mechanism for a transmission (16) having a first and a second combination of gears (24, 26) is disclosed. The shift mechanism has a rod member and a hydraulic actuator (28) operatively connected to an end of the rod member (34). The hydraulic actuator is configured to move the rod member between a first position at which the first combination of gears (24) is engaged to transmit power, a second position at which the second combination of gears (26) is engaged to transmit power, and a third position at which neither the first nor the second combination of gears is engaged to transmit power. The hydraulic actuator has a first piston (48) slidably connected to the rod member, a second piston (50) fixedly connected to the rod member, and a housing. The housing forms three chambers (42, 45, 46) and has only two fluid conduits (52, 54) in communication with the three chambers.</p> |
