Patent ID: 8021264
Filing Date: 2011-09-20
Classification: F16H

Abstract:
1. A gear train of an automatic transmission for a vehicle comprising: a first planetary gear set being a simple planetary gear set provided with three rotational members, wherein a first rotational member is always operated as a substantially fixed member, a second rotational member forms a first intermediate output pathway where a reduced rotational speed is output, and a third rotational member forms an input pathway that is directly connected with an input shaft; a second planetary gear set combined with first and second simple planetary gear sets that have three rotational members respectively, and the second planetary gear set realizes fourth, fifth, sixth, and seventh rotational members; wherein the fourth rotational member, which is realized with one rotational member, forms a first intermediate input path by being directly connected with the second rotational member; the fifth rotational member, which is realized with one rotational member, is operated as an output element by being connected with an output shaft; the sixth rotational member, which is realized with two rotational members directly connected with each other, forms a first variable input path by being variably connected with the input shaft, and is selectively operated as a fixed element by being connected with a transmission housing; the seventh rotational member, which is realized with two rotational members variably connected or separated from each other, forms a second intermediate input path by being variably connected with the second rotational member, forms a second variable input path by being variably connected with the input shaft, and is operated as a variable fixed element by being variably connected with the transmission housing; and a plurality of friction members comprising clutches and brakes that selectively connect the rotational members with one of the other rotational members, the transmission housing, or the input shaft; wherein the plurality of friction members comprises: a second brake disposed between the seventh rotational member and the transmission housing; wherein: