Planetary gear train of automatic transmission for vehicles

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 a first inverse rotation speed;
• a first planetary gear set disposed on the first shaft and including as rotation elements a first planet carrier, a first ring gear, and a first sun gear, wherein the first planet carrier is directly connected to the first shaft and always operated as an input element, the first ring gear is selectively operated as an output element, and the first sun gear is selectively operated as an output element or a fixed element;
• a second planetary gear set disposed on the second shaft and including as rotation elements a second sun gear, a second ring gear, and a second planet carrier, wherein the second sun gear receives a second inverse rotation speed from the first ring gear;
• a third planetary gear set disposed on the second shaft and including as rotation elements a third sun gear, a third ring gear, and a third planet carrier, wherein the third sun gear is directly connected to the second shaft, the third ring gear is selectively connected to the first sun gear so as to selectively receive a third inverse rotation speed from the first sun gear, the third ring gear is selectively connected to the second planet carrier, and the third planet carrier is directly connected to the second ring gear and an output gear;
• three transfer gears interposed at connecting portions between the rotation elements, wherein a third transfer gear of the three transfer gears includes a third transfer drive gear selectively directly connected to the first sun gear and a third transfer driven gear connected to the third ring gear;
• and
• five frictional elements each selectively interconnecting one of the rotation elements of the first, second, and third planetary gear sets with another of the rotation elements of the first, second, and third planetary gear sets, or selectively connecting one of the rotation elements of the first, second, and third planetary gear sets to a transmission housing.