Patent ID: 8425359
Filing Date: 2013-04-23
Classification: F16H

Abstract:
1. A hybrid transmission comprising: an input member and an output member; a first and a second motor/generator; a first, a second, and a third planetary gear set; wherein the input member is continuously connected for common rotation with a member of the first planetary gear set; wherein the output member is continuously connected for common rotation with a member of the third planetary gear set; wherein the first motor/generator is continuously connected for common rotation with another member of the first planetary gear set; wherein the second motor/generator is continuously connected for common rotation with a member of the second planetary gear set; an interconnecting member continuously connected for common rotation with a respective member of each of the first, the second, and the third planetary gear sets that is not connected for common rotation with the input member, the output member or either of the motor/generators; a plurality of torque-transmitting mechanisms each selectively engageable to connect a member of one of the planetary gear sets to one of a stationary member and another member of one of the planetary gear sets; wherein the plurality of torque-transmitting mechanisms includes a torque-transmitting mechanism that is selectively engageable to connect the interconnecting member to another member of the third planetary gear set; and wherein the motor/generators and the torque-transmitting mechanisms are selectively engageable in different combinations to provide four electric-only operating modes between the input member and the output member; wherein the torque-transmitting mechanisms are selectively engageable in different combinations to provide four electrically-variable operating modes between the input member and the output member, including two input-split operating modes and two compound-split operating modes when one or both motor/generators are powered and power is provided at the input member; and wherein the third planetary gear set provides a speed reduction ratio both in one of the two input-split operating modes and in one of the two compound-split operating modes, and provides a direct drive ratio by engaging said torque-transmitting mechanism to connect the interconnecting member to said another member of the third planetary gear set in the other of the two input-split operating modes and the other of the two compound-split operating modes.