Patent ID: 6840885

Claim:
A six-speed powertrain for a vehicle, comprising: a main shift section realized through first and second single pinion planetary gearsets, in which a first planet carrier, which acts as an output element, is fixedly connected to a second ring gear, a first ring gear is fixedly connected to a second planet carrier, and a first sun gear, the second planet carrier, and a second sun gear are variably connected to an input shaft with first, second, and third clutches respectively interposed therebetween, a connecting member connecting the first ring gear and the second planet carrier being variably connected to a housing through a first brake and a first one-way clutch, and the second sun gear being variably connected to the housing by a second brake; and a secondary shift section realized through a third single pinion planetary gearset, in which a third sun gear is connected to a third planet carrier, which operates as an output element, with a fourth clutch interposed therebetween, and which is also connected to the housing through a third brake and a second one-way clutch, wherein the main shift section and the secondary shift section are mounted along a common axis.