US Patent 9033836 Drive device for hybrid electric vehicle

A drive device for a hybrid electric vehicle includes a power splitting gear set including a first planetary gear set having three rotatable elements of a first sun gear, a first ring gear and a first pinion carrier, and first and second motors/generators. An input shaft is connectable with the first ring gear. The output shaft is connected with the first pinion carrier. The first motor/generator is connected with the first sun gear. The second motor/generator is connectable with the output shaft and the first ring gear. The first ring gear is capable of being fixed to a stationary part.