| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear train of an automatic transmission for a vehicle capable of reducing fuel consumption by improving mountability and power transmission performance.SOLUTION: A planetary gear train of an automatic transmission for a vehicle includes an input shaft which receives transmission of engine power, an output shaft which outputs speed-changed rotary power, a first planetary gear set having a first rotary element selectively connected to the input shaft, a second rotary element selectively connected to the input shaft, and simultaneously selectively operating as a fixed element, and a third rotary element operating as an output element, a second planetary gear set having a forth rotary element disposed on the output shaft and selectively operating as a fixed element, a fifth rotary element directly connected to the output shaft, and a sixth rotary element selectively connected through a plurality of circumscribing gears, four transfer gears, and a plurality of frictional elements composed of a plurality of clutches for connecting the input shaft and the plurality of rotary elements of the first and second planetary gear sets to each other, and a plurality of brakes connecting the plurality of rotary elements of the first and second planetary gear sets with a transmission housing. |
