Patent ID: 9328804
Filing Date: 2016-05-03
CPC Classification: F16H

Claim Text:
1. A planetary gear train of an automatic transmission for a vehicle, comprising: an input shaft into which power of an engine is input; a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear; a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear; a first rotational shaft including the first sun gear, selectively connected to the input shaft, and selectively connected to a transmission housing; a second rotational shaft including the first planetary carrier and the second ring gear, and selectively connected to the transmission housing; a third rotational shaft including the second planetary carrier; a fourth rotational shaft including the second sun gear and directly connected to the input shaft; a fifth rotational shaft including the first ring gear and the fourth sun gear, and selectively connected to the third rotational shaft; a sixth rotational shaft including the third ring gear and the fourth planetary carrier, and selectively connected to the input shaft; a seventh rotational shaft including the third planetary carrier and the fourth ring gear or the fourth ring gear only, and directly connected to an output shaft; and an eighth rotational shaft including the third sun gear and directly connected to the transmission housing.