Patent ID: 7261661

Claim:
A hybrid electro-mechanical transmission comprising: an input member for receiving power from a power source; an output member for delivering power from the transmission; a single motor/generator; an energy storage device for interchanging electrical power with said motor/generator; three planetary gear sets utilizing first, second and third members; wherein said first, second and third planetary gear sets are coaxially aligned; wherein said motor/generator annularly circumscribes at least one of said planetary gear sets; first, second and third interconnecting members each continuously interconnecting a different one of said members of one of said planetary gear sets to another different one of said members of another of said planetary gear sets; and four torque-transmitting mechanisms operative to connect said members of said gear sets with other members or with a stationary member and selectively engagable alone or in pairs to provide a reverse mode powered only be said motor/generator, a launch mode powered only by said motor/generator, and at least five fixed forward speed ratios powered by said power source and with selective assisting power by said motor/generator.