Patent ID: 9709135
Date: 2017-07-18
CPC Classifications: F16H

Claim:
1. A planetary gear train of an automatic transmission for a vehicle, comprising: an input shaft configured to receive an engine torque; an output shaft configured to output a shifted torque; a first planetary gear set having first, second, and third rotational elements; a second planetary gear set having fourth, fifth, and sixth rotational elements; a third planetary gear set having seventh, eighth, and ninth rotational elements; a fourth planetary gear set having tenth, eleventh, and twelfth rotational elements; a first shaft connected with the first rotational element and directly connected with the transmission housing; a second shaft that interconnects the second rotational element, the sixth rotational element, and the seventh rotational element and is selectively connected with the transmission housing; a third shaft connected with the third rotational element; a fourth shaft connected with the fourth rotational element, directly connected with the input shaft, and selectively connected with the third shaft; a fifth shaft connected with the fifth rotational element and selectively connected with the first shaft; a sixth shaft connecting the eighth rotational element and the twelfth rotational element, selectively connected with the fourth shaft and selectively connected with the transmission housing; a seventh shaft that interconnects the ninth rotational element and the eleventh rotational element and is directly connected with the output shaft; and an eighth shaft connected with the tenth rotational element and selectively connected with the fourth shaft.