| 摘要 |
An automatic transmission includes primary drive gears that are fixed on main-shaft sleeve provided on a main shaft; primary driven gears which are rotatably provided on a countershaft, which constantly mesh with the primary drive gears, and which are selectively connected to the countershaft. Further, a first clutch engages and disengages power between the main shaft and the main-shaft sleeve; and secondary drive gears are rotatably provided on the main shaft, and are selectively connected to the main shaft. Secondary driven gears which are fixed on a countershaft sleeve provided on the countershaft, and which constantly mesh with the secondary drive gears. A second clutch engages and disengages power between the countershaft and the countershaft sleeve. A parking lock position is established when clutches are disengaged and one forward gear and a reverse gear are concurrently connected to the countershaft.
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