Abstract: An infinitely variable power branching transmission with first and second operating modes, whereof the components are distributed between two power paths connecting in parallel an engine to vehicle wheels. At least two planetary trains, two electrical machines, a reduction stage, and a control orient differently the power between the transmission input and output based on the operating mode thereof. Two reduction stages are arranged in parallel between the two planetary trains on the same power path, the two reduction stages being respectively urged in the first and in the second operating transmission mode.

Abstract: The invention concerns an infinitely variable power branching transmission with two operating modes, whereof the components are distributed between two power paths connecting in parallel the heat engine (1) to the vehicle wheels (3), said means including at least two planetary trains (5, 6) two electrical machines (2, 4), a reduction stage (7), and control means orienting differently the power between the transmission input and output based on the operating mode thereof. The invention is characterised in that it comprises two reduction stages (7) arranged in parallel between the two trains (5, 6) on the same power path, said two stages being respectively urged in the first and in the second operating transmission mode.