| 摘要 |
PURPOSE: A power train of an auto transmission is provided to reduce the volume and whole length of the auto transmission, thereby reducing the weight and production cost of the auto transmission. CONSTITUTION: A deceleration planetary gear set outputs the rotation of an input shaft(10) as deceleration rotation. A complex planetary gear set receives selectively non-deceleration rotation and deceleration rotation from the input shaft and the deceleration planetary gear set to output multi-stage speed change rotation to an output shaft(20). The deceleration planetary gear set a first working element which is constantly restricted by a transmission case(30), a second working element which is selectively connected to a plurality of working elements equipped with the working element of the complex planetary gear set, and a third working element which is constantly connected to the input shaft. The complex planetary gear set comprises a fourth working element, a fifth working element, a sixth working element, and a seventh working element. The fifth working element is selectively connected to the input shaft, and is selectively restricted by the transmission case, and shares constantly a pair of working elements among the working elements of the complex planetary gear set.
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