| 摘要 |
A vehicle automatic transmission includes an input shaft connected to an output shaft of an engine, an output shaft, and a torque converter for transmitting driving torque from the engine to the automatic transmission. A planetary gear system of the automatic transmission is provided with first, second, third and fourth planetary gear sets. The first gear set has a first sun gear, a first ring gear, a pair of first pinion gears, and a first planetary carrier. The second, third and fourth gear sets respectively have second, third and fourth sun gears, second, third and fourth ring gears, second, third and fourth single pinion gears, and second, third and fourth planetary carriers. The planetary gear system is further provided with four rotational elements, two clutches, and three brakes.
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