Patent ID: 8241166

Claim:
A power train for a hybrid vehicle comprising: a first planetary gear set having three rotary elements; a second planetary gear set having three rotary elements, two of which elements are, respectively, connected with two of the three elements of the first planetary gear set so as to form two pairs of connected rotary elements; an engine that is connected to the first planetary gear set and the second planetary gear set; a first motor generator that is connected to the first planetary gear set; a second motor generator that is connected to the second planetary gear set; an output element that is connected to the second planetary gear set; a first brake that is configured to restrain rotation of one of the two pairs of connected rotary elements; a second brake that is configured to restrain rotation of one of the three rotary elements of the first planetary gear set; and a clutch configured to shift connecting state between one of the two pairs of connected rotary elements of the first planetary gear set and the second planetary gear set and the other rotary elements of the first planetary gear set and the second planetary gear set, such that all the rotary elements of the first planetary gear set and all the rotary elements of the second planetary gear set can be locked to each other and can integrally rotate, when the clutch is engaged, wherein the engine is connected directly to one of the two pairs of connected rotary elements, and the output element is connected to the other pair, and the first motor generator is connected with the other rotary element, which is not connected with the engine and the output element, of the first planetary gear set, wherein the first brake is configured to restrain rotation of the pair that is connected with the engine, and the second brake is configured to restrain rotation of the other rotary element, which is not connected with the rotary elements of second planetary gear set, of the first planetary gear set, and wherein the clutch is disposed between the pair that is connected with the engine and the rotary element of the first planetary gear set, of which the rotation is restrained by second brake, and the second motor generator is connected to the other rotary element, which is not connected with the rotary elements of the first planetary gear set, of the second planetary gear set.