Patent ID: 8585521

Claim:
A transmission comprising: an input member; an output member; a stationary member; a first and a second planetary gear set each having a first member, a second member and a third member; a power-split unit including the first planetary gear set and having: a first electric motor/generator having a first rotor connected for rotation with the first member of the first planetary gear set and a first stator grounded to the stationary member; a second electric motor/generator having a second rotor connected for rotation with the second member of the first planetary gear set and a second stator grounded to the stationary member; wherein the second member of the first planetary gear set is connected for common rotation with the output member; a ratio-changing unit including the second planetary gear set and having: a first torque-transmitting mechanism selectively engageable to establish torque flow between the first member of the second planetary gear set and the third member of the first planetary gear set; a second torque-transmitting mechanism selectively engageable to establish torque flow between the second member of the second planetary gear set and the third member of the first planetary gear set; the first and second torque-transmitting mechanisms thereby providing two different speed ratios between the input member and the third member of the first planetary gear set; wherein the first member of the second planetary gear set is connected for common rotation with the input member; and wherein the third member of the second planetary gear set is grounded to the stationary member.