| 摘要 |
PURPOSE: A gear train of a 4 speeds automatic transmission for a vehicle improves shift quality thereof by making an asynchronous speed change at 1-2 and 3-4 gear changes. CONSTITUTION: An automatic transmission having very short length is designed by applying of a combined planetary gear set assembled to a radial direction. Thus, the transmission is easily adapted to a transversally disposed front drive vehicle. Especially, the transmission implements improve an asynchronous speed change at 1-2 and 3-4 gear changes, thereby improving the shift quality thereof. Therefore, the control of friction members becomes easy.
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