Patent ID: 6837816

Claim:
A transmission comprising: a transmission case; a first power source; a second power source; an electrical energy storage device in electrical communication with said second power source; a compound planetary gear set; an output shaft fixedly connected to at least a portion of said compound planetary gear set; and a plurality of torque transfer devices for selectively operatively connecting said first power source to said compound planetary gear set, and for connecting at least a portion of said planetary gear set to said transmission case, said plurality of torque transfer devices being simultaneously operable to selectively: (i) sum torque from said first and second power sources and transfer said summed torque to said output shaft; (ii) split torque from said first power source to simultaneously transfer a first portion of said split torque to said output shaft and a second portion of said split torque to said second power source; (iii) transmit torque from only a single one of said first and second power sources to said output shaft; (iv) transfer torque from said output shaft to said first and second power sources; and (v) transfer torque from said output shaft to either of said first or said second power sources independently; said compound planetary gear set further comprising: an input planetary gear train having a plurality of input gear train members, said input gear train members further comprising: an input sun gear, an input ring gear, and a plurality of input planetary gears engaging said input sun gear and said input ring gear and being operatively connected to an input planetary gear carrier; and an output planetary gear train having a plurality of output gear train members, said output gear train members further comprising: an output sun gear, an output ring gear, and a plurality of output planetary gears engaging said output sun gear and said output ring gear and being operatively connected to an output planetary gear carrier; wherein said input sun gear is conjoined with said output sun gear, and said input ring gear is conjoined with said output planetary gear carrier and said output shaft.