Planetary gear train of automatic transmission for vehicles

摘要

A planetary gear train of an automatic transmission may include a first planetary gear set including a first ring gear directly connected to a first shaft, a first planet carrier, and a first sun gear, a second planetary gear set disposed on a second shaft and including a second sun gear receiving an inverse rotation speed from the first planet carrier, a second ring gear selectively connected to the second shaft, and a second planet carrier, a third planetary gear set including a third sun gear directly connected to the second shaft, a third ring gear selectively connected to the first sun gear, and a third planet carrier directly connected to the second planet carrier and directly connected to an output gear, three transfer gears interposed between rotation elements, and five frictional elements selectively interconnecting the rotation elements or selectively connecting the rotation elements to a transmission housing.

主权项

1. A planetary gear train of an automatic transmission for a vehicle, comprising:
a first shaft receiving torque of an engine; a second shaft disposed in parallel with the first shaft and selectively receiving a rotation speed of the first shaft as an inverse rotation speed; a first planetary gear set disposed on the first shaft, and including a first ring gear directly connected to the first shaft so as to be continuously operated as an input element, a first planet carrier selectively operated as an output element, and a first sun gear selectively operated as an output element as rotation elements thereof; a second planetary gear set disposed on the second shaft, and including a second sun gear receiving an inverse rotation speed from the first planet carrier, a second ring gear selectively connected to the second shaft, and a second planet carrier as rotation elements thereof; a third planetary gear set disposed on the second shaft, and including a third sun gear directly connected to the second shaft, a third ring gear selectively connected to the first sun gear and receiving an inverse rotation speed, and a third planet carrier directly connected to the second planet carrier and directly connected to an output gear as rotation elements thereof; three transfer gears interposed at connecting portions between the rotation elements; and five frictional elements selectively interconnecting the rotation elements or selectively connecting the rotation elements to a transmission housing.