Integrated hybrid transmission with inertia assisted launch

A power transmission for a vehicle having an internal combustion engine, a motor/generator and a drive ratio selection transmission, said power transmission comprising:

• compounded first and second planetary gear sets, each having sun gear means, ring gear means and a plurality of planetary gears mounted on first and second carriers operatively to connect said sun and ring gear means of the respective first and second planetary gear sets;
• a common gear member serving not only as the ring gear for said first planetary gear set but also as the sun gear for said second planetary gear set;
• the internal combustion engine adapted selectively to provide torque to the ring and carrier of said second planetary gear set;
• means selectively to transfer torque between the motor/generator and said sun gear of said first planetary gear set and said second carrier;
• means selectively to transfer torque to and from the drive ratio selection transmission and the internal combustion engine, said ring gear of the second planetary gear set and the motor/generator through said second carrier;
• said first carrier being selectively connected to ground;
• and
• means selectively connecting said drive ratio selection transmission to ground.

A power transmission for a vehicle having an internal combustion engine, a motor/generator and a drive ratio selection transmission, said power transmission comprising:

• interconnected first and second planetary gear sets each having sun gear means, ring gear means and a plurality of planetary gears mounted on first and second carriers operatively to connect said ring and sun gear means of the respective first and second planetary gear sets;
• the ring gear for said first planetary gear set directly connected with the sun gear for said second planetary gear set;
• the internal combustion engine adapted selectively to provide torque to the ring and carrier of said second planetary gear set;
• means selectively to transfer torque between the motor/generator and said sun gear of said first planetary gear set and said second carrier;
• means selectively to transfer torque to and from the drive ratio selection transmission and the internal combustion engine, said ring gear of the second planetary gear set and the motor/generator through said second carrier;
• said first carrier being selectively connected to ground;
• and,
• means selectively connecting said drive ratio selection transmission to ground.

A power transmission for a vehicle having an internal combustion engine, a motor/generator and a drive ratio selection transmission, said power transmission comprising:

• compounded first and second planetary gear sets, each having first gear means, second gear means and a plurality of planetary gears mounted on first and second carriers operatively to connect said first and second gear means of the respective first and second planetary gear sets;
• a common gear member serving not only as the second gear for said first planetary gear set but also as the first gear for said second planetary gear set;
• the internal combustion engine adapted selectively to provide torque to one gear means carrier of said second planetary gear set;
• means selectively to transfer torque between the motor/generator and said one gear means of said first planetary gear set and said second carrier;
• means selectively to transfer torque to and from the drive ratio selection transmission and the internal combustion engine, said one gear means of the second planetary gear set and the motor/generator through said second carrier;
• said first carrier being selectively connected to ground;
• and,
• means selectively connecting said drive ratio selection transmission to ground.