Patent ID: 8414444
Filing Date: 2013-04-09
Classification: F16H

Abstract:
1. A planetary gear train of an automatic transmission for vehicles, comprising: an input shaft adapted to receive a torque of an engine; an output gear adapted to output a changed torque; a first planetary gear set having a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof; a second planetary gear set having a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof; a third planetary gear set having a third sun gear, a third planet carrier, and a third ring gear as rotation elements thereof; a first rotation shaft connected to the first sun gear and selectively connected to a transmission housing; a second rotation shaft connected to the first planet carrier; a third rotation shaft connected to the first ring gear and directly connected to the input shaft; a fourth rotation shaft connected to the second sun gear and selectively connected to the second rotation shaft; a fifth rotation shaft connected to the third ring gear and directly connected to the output gear; a sixth rotation shaft directly connected to the second planet carrier and the third planet carrier and selectively connected to the input shaft; a seventh rotation shaft directly connected to the second ring gear and the third sun gear and selectively connected to the first rotation shaft or the second rotation shaft; and six friction members interposed selectively at connecting portions of the rotation shafts.