Patent ID: 9618092
Date: 2017-04-11
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; a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element; a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element; a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element; and a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element, wherein the input shaft is directly connected to the fourth rotation element and is selectively connected to the eleventh rotation element, the output shaft is directly connected to the twelfth rotation element, the twelfth rotation element is directly connected to the eighth rotation element, the third rotation element is directly connected to the seventh and tenth rotation elements, the second rotation element is directly connected to the sixth rotation element, the first rotation element is selectively connected to the eighth rotation element, the fourth rotation element is selectively connected to the fifth rotation element, the third rotation element is selectively connected to the fifth rotation element, the fifth rotation element is selectively connected to the transmission housing, the first rotation element is selectively connected to the transmission housing, and the ninth rotation element is selectively connected to the transmission housing.