Patent ID: 9005073
Filing Date: 2015-04-14
Classification: F16H

Abstract:
1. A planetary gear train of an automatic transmission for a vehicle comprising: an input shaft receiving a torque of an engine; an output shaft outputting a changed torque; a first planetary gear set disposed at the input shaft and having a first sun gear, a first planet carrier, and first ring gear; a second planetary gear set disposed rearward to the first planetary gear set and having a second sun gear, a second planet carrier, and a second ring gear; a third planetary gear set disposed rearward to the second planetary gear set and having a third sun gear, a third planet carrier, and a third ring gear; a fourth planetary gear set disposed rearward to the third planetary gear set and having a fourth sun gear, a fourth planet carrier, and fourth ring gear; a first rotating body including the first sun gear; a second rotating body including the first planet carrier and being directly connected the input shaft; a third rotating body including the first ring gear and the third and fourth sun gears; a fourth rotating body including the second sun gear; a fifth rotating body including the second planet carrier; a sixth rotating body including the second ring gear and the third planet carrier; a seventh rotating body including the third ring gear and the fourth planet carrier and being directly connected to the output shaft; an eighth rotating body including the fourth ring gear; a first clutch variably connecting the first rotating body and the fourth rotating body; a second clutch variably connecting the second rotating body and the fourth rotating body; a third clutch variably connecting the third rotating body and the fifth rotating body; a fourth clutch variably connecting the fifth rotating body and the eighth rotating body; a first brake variably connecting the first rotating body and a transmission housing; and a second brake variably connecting the eighth rotating body and the transmission housing.