Patent ID: 9726260
Date: 2017-08-08
CPC Classifications: F16H

Claim:
1. A planetary gear train of an automatic transmission for a vehicle, comprising: an input shaft for receiving an engine torque; an output shaft for outputting a shifted torque; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; a first shaft interconnecting the first rotation element and the fourth rotation element; a second shaft interconnecting the second rotation element and the sixth rotation element; a third shaft connected to the third rotation element; a fourth shaft interconnecting the fifth rotation element and the seventh rotation element and directly connected to the input shaft; a fifth shaft connected to the eighth rotation element; a sixth shaft interconnecting the ninth rotation element and the eleventh rotation element and selectively connectable to the second shaft; a seventh shaft connected to the tenth rotation element and selectively connectable to the second shaft and the fifth shaft respectively; and an eighth shaft connected to the twelfth rotation element, selectively connectable to the fifth shaft, and directly connected to the output shaft.