Patent ID: 7944106

Claim:
A hybrid transmission comprising: an input shaft and an output shaft which together define a first axis of rotation; a transmission case at least partially defining a manifold; a transmission cover mounted to the transmission case, the transmission cover at least partially defining an oil passage; a first motor/generator at least partially enclosed by the transmission case, and having a first rotor sharing the first axis of rotation; a second motor/generator at least partially enclosed by the transmission case, and having a second rotor with a second axis of rotation that is distinct from the first axis of rotation, wherein the second motor/generator is disposed between the transmission case and the transmission cover, the second motor/generator comprising: a generally cylindrical stator disposed within a stator housing, the stator circumscribing the second rotor; a tube disposed along the central axis of the second rotor; a rotor drum mounted to the second rotor; a rotor hub mounted to the rotor drum; a first bearing configured to rotatably support the rotor drum, wherein oil is transferable through the manifold in order to lubricate the first bearing; a second bearing configured to rotatably support the rotor hub, wherein oil is transferable through the manifold, and through the tube in order to lubricate the second bearing; and a torque transfer device coupled to the rotor hub such that output from the second motor/generator can be transferred to the output shaft, wherein oil is transferable through the manifold, through the tube, and through the oil passage in order to lubricate the torque transfer device.