Patent ID: 7553253

Claim:
An automatic transmission in which an input shaft and an output part are disposed on the same axis, first to fourth planetary gear sets each formed of a sun gear, a carrier and a ring gear are provided and first to third clutches and first and second brakes are selectively operated to switch between power transmission paths from the input shaft to the output part, thereby providing at least six forward speeds, wherein each of the first and second planetary gear sets includes a given rotation element connected to the input shaft to consistently reduce the speed of input rotation and output the speed-reduced rotation, the third and fourth planetary gear sets are single pinion planetary gear sets and are connected to each other to have four rotation elements in combination, one of the four rotation elements being connected to the output part, and the first and second planetary gear sets are arranged oppositely in the axial direction of the third and fourth planetary gear sets with the third and fourth planetary gear sets interposed therebetween.