Patent ID: 8435151
Filing Date: 2013-05-07
Classification: F16H

Abstract:
1. A gear train of an automatic transmission for vehicles achieving at least ten forward speeds and one reverse speed, comprising: an input shaft receiving torque of an engine which is driving source; an output gear outputting a changed torque; first, second, third, and fourth planetary gear sets respectively having first, second, third, and fourth sun gears, first, second, third, and fourth planet carriers, and first, second, third, and fourth ring gears as rotation elements thereof; eight rotation shafts each formed by connecting one rotation element to another rotation element, the input shaft, or the output gear, or being the rotation element; and friction members having first, second, third, and fourth clutches disposed between selected rotation shafts and controls delivery of the torque therebetween and first and second brakes selectively connecting selected rotation shafts to a transmission housing; wherein the eight rotation shafts comprises: a first rotation shaft directly connecting the input shaft with the second planet carrier; a second rotation shaft directly connecting the output gear with the third planet carrier; a third rotation shaft directly connecting the first planet carrier with the second sun gear; a fourth rotation shaft being the first sun gear; a fifth rotation shaft directly connecting the third sun gear with the fourth ring gear; a sixth rotation shaft directly connecting the first ring gear with the third ring gear; a seventh rotation shaft directly connecting the second ring gear with the fourth sun gear; and an eighth rotation shaft being the fourth planet carrier.