Patent ID: 8491438

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; wherein the second planetary gear set includes a second sun gear, a second carrier, and a second ring gear, as the rotary elements; wherein the input element is an engine consistently connected to the first carrier; wherein the output element is consistently connected to the second carrier; wherein two of the four torque transmission mechanisms are clutches directly connecting/disconnecting only two rotary members of each of the two single planetary gear sets, the others of the clutches are brakes connecting/disconnecting rotary members to fixed members to stop rotation; and wherein 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.