Power train and power transmission therefor.

The present invention relates to a power train that is interposed between the internal combustion engine (11) and the drive ratio selection transmission (39) of a vehicle. An electric motor/generator (14) is operatively connected to a power transmission (10), and the power transmission selectively drives accessories (53-56) to the internal combustion engine, such as an oil pump, power steering pump and air conditioning compressor. The power transmission employs compounded first and second planetary gear sets (19,21). A common gear member (16) serves not only as the ring gear for the first planetary gear set but also as the sun gear for the second planetary gear set. The electric motor/generator drives the accessories when the internal combustion engine is idling or off, allowing those accessories to be smaller while delivering adequate output.