Patent ID: 8734287

Claim:
A power train for a hybrid vehicle, comprising: two single planetary gear sets having one rotary element, respectively, in which the rotary members are consistently connected; a first motor generator connected to a rotary element of a first planetary gear set, one of the single two planetary gear sets; a second motor generator connected to a rotary element of a second planetary gear set, the other of the two single planetary gear sets; an input element connected to any one of the rotary elements of the first planetary gear set; an output element connected to any one of the rotary elements not connected with the second motor generator, in the rotary elements of the second planetary gear set; and four torque transmission mechanisms connected to the rotary elements of the first planetary gear set and the second planetary gear set, wherein the first planetary gear set includes a first sun gear, a first carrier, and a first ring gear, as the rotary elements, the second planetary gear set includes a second sun gear, a second carrier, and a second ring gear, as the rotary elements, the input element is an engine consistently connected to the first carrier, the output element is consistently connected to the second carrier, two of the four torque transmission mechanisms are clutches connecting/disconnecting two rotary members, the others of the clutches are brakes connecting/disconnecting rotary members to fixed members to stop rotation; and at least one of the two brakes is connected to any one of the second sun gear and the second ring gear of the second planetary gear set, and wherein the first ring gear of the first planetary gear set is consistently connected to the second carrier of the second planetary gear set, the first motor generator is connected to the first sun gear, the second motor generator is connected to the second sun gear, the two clutches are a first clutch and a second clutch, the first clutch connects/disconnects the first sun gear and the second ring gear, the second clutch connects/disconnects the first carrier and the second sun gear, the two brakes are a first brake and a second brake, the first brake is connected to the second ring gear, and the second brake is connected to the second sun gear.