| 摘要 |
A power train of the auto transmission is provided to raise the performance of the power transfer by increasing the implemented number of speed-changing steps. A power train of the auto transmission comprises the input shaft(100), the output gear(200), the transmission case(300), the first planetary gear set (PG1), the second planet gear set (PG2), the third planetary gear set (PG1), and the plurality of friction members(C1,C2,C3,C4,B1,B2). The deceleration unit comprises the first operation member, the second operation member, and the third operation member. The output unit comprises the fourth operation member, the fifth operation member, and the sixth operation member. The friction member connects the operation members of first, second, third planetary gear set to the input shaft, and the other operation members or the transmission case.
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