Planetary gear train of automatic transmission for vehicle

摘要

A planetary gear train of an automatic transmission for a vehicle may include: an input; an output; a first planetary gear set on the input including a first rotation element selectively connected to the input and selectively operated as a fixed element, a second rotation element selectively connected to the input and a third rotation element; a second planetary gear set on the output including a fourth rotation element connected to the second rotation element and selectively operated as a fixed element, a fifth rotation element connected to the third rotation element and directly connected to the output, and a sixth rotation element selectively connected to the input; four transfer gears; and frictional elements including clutches connecting the input and the rotation elements of the first and second planetary gear sets, and brakes connecting the rotation elements of the first and second planetary gear sets and a transmission housing.

主权项

1. A planetary gear train of an automatic transmission for a vehicle, comprising:
an input shaft receiving torque of an engine; an output shaft disposed in parallel with the input shaft at a predetermined distance from the input shaft and outputting changed torque; a first planetary gear set disposed on the input shaft and including a first rotation element selectively connected to the input shaft and selectively operated as a fixed element, a second rotation element selectively connected to the input shaft, and a third rotation element; a second planetary gear set disposed on the output shaft, and including a fourth rotation element connected to the second rotation element through a first externally-meshed gear and selectively operated as a fixed element, a fifth rotation element connected to the third rotation element through a second externally-meshed gear and directly connected to the output shaft, and a sixth rotation element selectively connected to the input shaft through third and fourth externally-meshed gears, wherein a gear ratio of the third externally-meshed gear is different from that of the fourth externally-meshed gear; four transfer gears forming the first, second, third and fourth externally-meshed gears; and frictional elements including clutches connecting the input shaft and the rotation elements of the first and second planetary gear sets and brakes connecting the rotation elements of the first and second planetary gear sets and a transmission housing, wherein the first planetary gear set is a single pinion planetary gear set including a first sun gear being the first rotation element, a first planet carrier being the second rotation element, and a first ring gear being the third rotation element, and the second planetary gear set is a single pinion planetary gear set and including a second sun gear being the fourth rotation element, a second planet carrier being the fifth rotation element, and a second ring gear being the sixth rotation element.