| 摘要 |
An automatic transmission is provided with an input shaft in which a plurality of drive gears are provided, and an output shaft in which a plurality of driven gears constantly engaging with the drive gears are provided. A transmission gear for transmitting a power is selectively switched from a plurality of transmission gear trains formed by the drive gears and the driven gears respectively engaging with the drive gears, by a switching mechanism. An input clutch for switching a transmission of an engine power to the input shaft and a disconnection thereof is arranged between a crankshaft of the engine and the input shaft. A plurality of bypass clutches capable of transmitting the power to the respective transmission gear trains are provided at an end portion of the input shaft, and the engine power is transmitted to the output shaft via at least any one of the bypass clutches at a time of shifting gears. The input clutch and the plurality of bypass clutches are concentrically arranged in series between the engine and the input shaft, whereby it is possible to avoid the automatic transmission unit from becoming long and large in size.
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