Patent ID: 7980985

Claim:
A gear train of an automatic transmission for a vehicle, comprising: a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear; a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear; a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear; a fourth planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear; and first, second, and third clutches and first and second brakes, wherein an input shaft is directly connected with the second planet carrier; the second sun gear is directly connected with the first ring gear; the first planet carrier is directly connected with the third ring gear; the second ring gear is directly connected with the fourth sun gear; the third sun gear is directly connected with the fourth ring gear; the third planet carrier is variably connected with the fourth planet carrier; the fourth sun gear is variably connected with the fourth planet carrier; the second planet carrier is variably connected with the third sun gear; the first sun gear and the first ring gear are variably connected with a transmission housing, respectively; and the third planet carrier is connected with an output gear.