Patent ID: 7001296

Claim:
A hybrid transmission comprising: a two-degree of freedom differential unit including four or more rotary members and structured in such a way that, when revolution states of two rotary members from among the four or more rotary members are determined, the revolution states of the other rotary members are determined; a coupling section that sequentially couples the respective rotary members, in a higher revolution speed order, to one motor/generator, to one of an output to a drive system and an input from a main power source, to the other of the output and input, and to another motor/generator; and a brake installed to fix one of the rotary members which is coupled to the input from the main power source, wherein, during a vehicle start, the brake is engaged to fix the rotary member coupled to the input and respective motors are driven for both of the motor/generators to generate torques of a same direction to the output.