Patent ID: 7544145

Claim:
A power train of an automatic transmission comprising: a first planetary gear set comprising a first ring gear, a first sun gear, a first pinion gear, and a first carrier; a second planetary gear set comprising a second ring gear, a second sun gear, a second pinion gear, and a second carrier; a third planetary gear set comprising a third ring gear, a third sun gear, a third pinion gear, and a third carrier; a fourth planetary gear set comprising a fourth ring gear, a fourth sun gear, a fourth pinion gear, and a fourth carrier; a first clutch for connecting the first and second sun gears and the second ring gear; a second clutch for connecting the first and third ring gears and fourth carrier; and a brake unit for selectively restraining rotation of the sun gears, the carriers, and the ring gears; wherein the first and second carriers are connected; the first and second sun gears are connected; the third ring gear and the fourth carrier are connected; the third and fourth sun gears are connected; the first ring gear is connected to an input shaft; and the third carrier is connected to an output shaft.