Patent ID: 8475322
Filing Date: 2013-07-02
Classification: F16H

Abstract:
1. An automatic transmission comprising: a double-pinion planetary gearset including: a first single-pinion planetary gearset including: a second single-pinion planetary gearset including: an input shaft; an output shaft constantly coupled to the third planet-pinion carrier; a first coupling member arranged to be selectively applied to couple the second planet-pinion carrier to the first rotor unit; a second coupling member arranged to be selectively applied to couple the second planet-pinion carrier to the second rotor unit; a third coupling member arranged to be selectively applied to couple the input shaft to the second planet-pinion carrier; a fourth coupling member arranged to be selectively applied to couple the second ring gear to the third sun gear; a fifth coupling member arranged to be selectively applied to couple the second ring gear to the third planet-pinion carrier; and a sixth coupling member arranged to be selectively applied to couple the input shaft to the third sun gear; wherein at least first to eighth forward gear ratios and one reverse gear ratio are obtained between the input shaft and the output shaft by simultaneous application of three of the first to sixth coupling members.