| 摘要 |
PURPOSE: To achieve a remarkably high gear ratio in a lowest gear by freely and rotatably mounting a common gear on an output shaft, and locking the shaft by a coupling device. CONSTITUTION: When the driving is performed in a first gear (solid line), a freely rotatable gear 22 is free in a state that a coupling sleeve 27 is located on a neutral position. The torque is successively transmitted to an input shaft 6, a gear 17, a gear 22 and a gear 19, and further transmitted to a locked gear 40 on an output shaft through a gear ring 41. When a second gear is engaged (broken line), the gear 19 is disengaged and declutched, and the torque is transmitted to the output shaft 20 through the gear ring 41. Accordingly in two lowest gears, the torque is transmitted to the common gear ring 41, and as the gear ring 41 is directly formed on a lay-shaft 15, it can endure the large load, and high gear ratio can be obtained by providing the gear with a small diameter. |
