TRANSMISSION GEAR ENGAGEMENT MECHANISM AND METHOD OF OPERATION

摘要

A transmission (12) for a vehicle (10) includes a gear shaft (40) having a fluid passage (106), and a gear (42) having a first bore mounted to the gear shaft (40). The gear has a first axial face (74) with a plurality of teeth (76), and a first undercut (78) at each of the first bore and the first axial face. A shift collar (64) has a second bore (88) mounted to the gear shaft (40). The second bore (88) is axially movable and rotationally fixed relative to the gear shaft (40). The shift collar (64) has a second axial face (92) with a plurality of teeth (94), and a second undercut (98) at each of the second bore (88) and the second axial face (92). The teeth (94) of the second axial face (92) are enmeshable with the teeth (76) of the first axial face (74). An annular piston (66) is slidably mounted to the gear shaft (40) and positioned within each of the first undercut (78) and the second undercut (98). The annular piston (66) is configured to move the shift collar (64) away from the gear using pressurized fluid in the fluid passage (106).