Parallel hybrid powertrain for an automotive vehicle

A hybrid vehicle powertrain comprising an internal combustion engine and an electric motor-generator unit;

• a transmission having multiple-ratio gearing between a transmission power input shaft and a transmission power output shaft;
• a geared differential assembly having a differential carrier connected drivably to said transmission power output shaft and to side gears;
• a pair of driving axle shafts connected drivably to said side gears, said transmission power output shaft being a sleeve shaft, and one of said driving axle shafts being rotatably received within said sleeve shaft;
• auxiliary gearing defining an auxiliary torque flow path between said motor-generator unit and said differential carrier;
• said multiple-ratio gearing defining a main torque flow path between said transmission power input shaft and said differential carrier, said main torque flow path being disposed in parallel relationship with respect to said auxiliary torque flow path;
• engageable and disengageable main clutch means for establishing and disestablishing a driving connection between said engine and said transmission power input shaft;
• and
• an electrical energy storage reservoir connected electrically to said motor-generator unit;
• said motor-generator unit storing electric energy in said storage reservoir when said engine delivers torque to said transmission power input shaft with said clutch means engaged and said motor-generator unit delivering torque to said differential carrier when said main torque flow path is interrupted by disengagement of said main clutch means.