| 摘要 |
A shift device includes a hub (12), a sleeve (22) splined wit the hub (12), a pair of speed gears (18, 20) located at both sides of the hub (12), and a pair of synchronizer rings (24) arranged between the hub (12) and the speed gears (18, 20). Thrust pieces (26) are respectively engageable with projections (22h) of the sleeve (22) and movable in notch portions (12f) of the hub (12) in an axial direction the shift device. The thrust pieces (26) are formed with first slanted surfaces (26k to 26n) pressable on chamfers (24c, 24d) of the synchronizer rings (24) and second slanted surfaces (26o to 26r) contactable with slanted surfaces (12g to 12j) of the hub (12). The thrust pieces (26) engage and move together with the sleeve (22) in the axial direction when the first slanted surfaces (26k to 26n) press the chamfers (24c, 24d) of the synchronizer ring (24) and are disengaged from the sleeve (22) before the splines (22a) of the sleeve (22) and the speed gear (18; 20) are engaged.
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