Patent ID: 8992371
Filing Date: 2015-03-31
Classification: F16H

Abstract:
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 compound planetary gear set having five rotation shafts, the first compound planetary gear set formed by combining first and second planetary gear sets and firstly changing torque input through one input path and two variable input paths into six speeds; a second compound planetary gear set having four rotation shafts, the second compound planetary gear set formed by combining third and fourth planetary gear sets, secondly changing the six speeds input from the first compound planetary gear set and a rotation speed of the input shaft input through one variable input path into eleven forward speeds and reverse speed, and finally outputting the changed rotation speed, wherein any one rotation shaft of the first compound planetary gear set is directly connected to any one rotation shaft of the second compound planetary gear set; and friction members including clutches interposed between any two rotation shafts or between any one rotation shaft and the input shaft, and brakes interposed between any one rotation shaft and a transmission housing.