| 摘要 |
An automatic transmission having input and output shafts, a plurality of gear trains, a shift mechanism, and a sub clutch. An actuator operates the shift mechanism to shift the gear trains according to a driving state of the vehicle. The sub clutch transmits the driving force from the input shaft to the output shaft during gearshift. The driving force transmitting path in which the sub clutch is disposed, forms a third speed gear train that is the third gear counted from the gear having the maximum speed ratio. The sub clutch functions as a third speed shift mechanism for the third speed gear train.
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