Patent ID: 8647228
Filing Date: 2014-02-11
Classification: F16H

Abstract:
1. A gear train of an automatic transmission for vehicles provided with first, second, and third planetary gear sets, each respectively having three members, the gear train comprising: a first rotation element having a first member of the first planetary gear set directly connected to an input shaft so as to be always operated as an input element; a second rotation element having a second member of the first planetary gear set forming a first intermediate output path through which a reduced rotation speed is output and operated as a selective fixed element; a third rotation element having a third member of the first planetary gear set forming a second intermediate output path through which an inverse rotation speed is output and operated as a selective fixed element; a fourth rotation element having a first member of the second planetary gear set connected selectively to the first and second intermediate output paths so as to form a first variable input path; a fifth rotation element having a second member of the second planetary gear set and a first member of the third planetary gear set selectively connected to an input shaft so as to form a second variable input path and operated as a selective fixed element; a sixth rotation element having a second member of the third planetary gear set connected to an output gear so as to form a final output path; a seventh rotation element having a third member of the second planetary gear set and a third member of the third planetary gear set selectively connected to the input shaft so as to form a third variable input path; and friction members having a plurality of clutches selectively connecting each rotation element to the input shaft or another rotation element and a plurality of brakes selectively connecting each rotation element to a transmission housing.