| 摘要 |
<p>A sleeve (20) has splines (20a) formed with a groove (20d), a high-speed-stage slanting surface (20g) and a turn-off slanting surface (20i). A synchronizer ring (22) has splines (22c) and first projecting portions (22b). Lever members (24) are arranged among the sleeve (20), the hub (12) and the synchronizer ring (22) to transmit pushing force from the sleeve (22) to the synchronizer ring (22). The synchronizer ring (22) is pushed against a speed gear (18) to generate frictional torque, being pushed by the lever members (24) pressed by a high-speed-stage slanting surface (20g). The lever members (24) turn over and transmit pushing force applied from a turn-over slanting surface (20i) to the synchronizer ring (22) as to press a friction surface (22a) against a cone surface (18b) to synchronize them when the sleeve (20) moves in a direction opposite to the speed gear (18). A diameter of the first inner diameter portion (20f) is set larger than that of the second inner diameter portion (20h).
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