Patent ID: 8974343
Filing Date: 2015-03-10
Classification: F16H

Abstract:
1. A planetary gear train of an automatic transmission for a vehicle, comprising: a first shaft receiving a torque of an engine; a second shaft disposed substantially in parallel with the first shaft; a first planetary gear set disposed on the first shaft, and including a first sun gear operated as an output element or a fixed element, a first planet carrier directly connected to the first shaft and operated as an input element, and a first ring gear operated as an output element, wherein the first sun gear, the first planet carrier and the first ring gear are rotation elements thereof; a second planetary gear set disposed on the second shaft, and including a second sun gear connected to the first ring gear through an externally-meshed gear, a second planet carrier, and a second ring gear selectively connected to the first planet carrier and the first ring gear through externally-meshed gears, wherein the second sun gear, the second planet carrier, and the second ring gear are rotation elements thereof; a third planetary gear set disposed on the second shaft, and including a third sun gear connected to the second ring gear, a third planet carrier selectively connected to the second planet carrier and directly connected to an output gear to be operated as an output element, and a third ring gear selectively connected to the first sun gear through an externally-meshed gear, wherein the third sun gear, the third planet carrier and the third ring gear are rotation elements thereof; three transfer gears forming the externally-meshed gears; and frictional elements selectively interconnecting the rotation elements of the first, second, and third planetary gear sets or selectively connecting at least one rotation element to a transmission housing, wherein the three transfer gears comprise a first transfer gear selectively connecting the first planet carrier to the second ring gear; a second transfer gear connecting the first ring gear directly to the second sun gear and selectively to the second ring gear; and a third transfer gear selectively connecting the first sun gear to the third ring gear.