Method and apparatus for providing a hydraulic transmission pump assembly having a differential actuation

摘要

A hydraulic transmission pump assembly including a pump, an electric motor operatively coupled to the pump, and a differential gear assembly interposed between the two. The differential gear assembly acts to divide engine torque between the pump and the electric motor at engine speeds above a predetermined level thereby providing fluid under pressure to the transmission and driving the electric motor to generate electricity; the electric motor also being operable to drive the pump at engine speeds below the predetermined level thereby providing fluid under pressure to the transmission during this operating condition.