Patent ID: 9644712
Date: 2017-05-09
CPC Classifications: F16H

Claim:
1. A planetary gear train of an automatic transmission for a vehicle, comprising: an input shaft receiving torque of an engine; an output shaft outputting changed torque of the engine; a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear; a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear; a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear; a fourth planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear; a first rotation shaft including the first sun gear and the third planet carrier and directly connected to the input shaft; a second rotation shaft including the first planet carrier and the third ring gear and selectively connected to a transmission housing; a third rotation shaft including the first ring gear and the second planet carrier; a fourth rotation shaft including the fourth sun gear; a fifth rotation shaft including the second ring gear and directly connected to the transmission housing; a sixth rotation shaft including the third sun gear; a seventh rotation shaft including the fourth sun gear, selectively connected to the fourth rotation shaft, and selectively connected to the transmission housing; an eighth rotation shaft including the fourth planet carrier, selectively connected to the third rotation shaft, and directly connected to the output shaft; and a ninth rotation shaft including the fourth ring gear and selectively connected to the second rotation shaft.