Patent ID: 8608612
Filing Date: 2013-12-17
Classification: F16H

Abstract:
1. A planetary gear train of an automatic transmission for vehicles, comprising: an input shaft adapted to receive torque of an engine; an output shaft adapted to output a changed torque; a first planetary gear set having a first rotation element selectively connected to the input shaft and adapted to be operated as a selective input element, a second rotation element adapted to be always operated as a fixed element, and a third rotation element adapted to be operated as an output element; a second planetary gear set having a fourth rotation element directly connected to the second rotation element of the first planetary gear set and adapted to be always operated as a fixed element, a fifth rotation element directly connected to the input shaft and adapted to be always operated as an input element and to output a speed of the input shaft, and a sixth rotation element adapted to be always operated as an output element; a compound planetary gear set having four rotation elements, wherein a seventh rotation element adapted to selectively receive the speed of the input shaft from the fifth rotation element of the second planetary gear set or to be operated as a selective fixed element, an eighth rotation element adapted to selectively receive an increased speed from the sixth rotation element of the second planetary gear set or to be operated as a selective fixed element, a ninth rotation element directly connected to the output shaft and adapted to be always operated as an output element, and a tenth rotation element selectively connected to the input shaft and adapted to be operated as a selective input element; eight rotation members consisting of at least one of rotation elements of the first and second planetary gear sets and the compound planetary gear set; and six friction members including clutches interposed between the selected two rotation member among the rotation members or between the selected rotation member and the input shaft and brakes interposed between the selected rotation member among the rotation members and the transmission housing.