| 摘要 |
<p>An automatic transmission has a first input shaft (10a) and a second input shaft (10b) which are arranged concentrically, and an output shaft (19) which is in parallel thereto, and a plurality of transmission gear trains are provided between the input shafts (10a, 10b) and the output shaft (19). An input switching shaft (20) is arranged in parallel to the input shafts (10a, 10b) and the output shaft (19), and the input switching shaft (20) is provided with a first friction clutch (31) which switches into a power transmission state and a disconnection state with respect to the first input shaft (10a), and a second friction clutch (31) which switches into a power transmission state and a disconnection state with respect to the second input shaft (10b). A damper (49) damping an engine vibration and transmitting the engine power to the input switching shaft (20) is provided between a crankshaft (48) of the engine and the input switching shaft (20). And the engine power is bypassed to the input switching shaft (20) so as to be transmitted to the output shaft 19 via the first friction clutch (31) or the second friction clutch (32) and to effectively shorter the entire length of the transmission.
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