System for transmitting torque with speed modulation

A system for transmitting torque with speed modulation between a motor generator and an engine, the system comprising:

• a first shaft configured to rotatably connect with the motor generator;
• a second shaft configured to rotatably connect with the engine;
• a first reduction gearset rotatably supported at least in part on the first shaft, the first reduction gearset disposed in selective engagement with the first shaft via a first overrunning clutch disposed therebetween;
• a second reduction gearset rotatably supported at least in part on the first shaft and at least in part on the second shaft, the second reduction gearset disposed in selective engagement with the first shaft via a second overrunning clutch disposed therebetween;
• wherein the first overrunning clutch is engaged and the second overrunning clutch is disengaged to transmit torque from the first shaft to the second shaft via the first and second reduction gearsets in tandem;
• and
• wherein the first overrunning clutch is disengaged and the second overrunning clutch is engaged to transmit torque from the second shaft to the first shaft via the second reduction gearset.

A method of transmitting torque with speed modulation between a motor generator and an engine, the method comprising:

• rotatably connecting a first shaft with the motor generator;
• rotatably supporting a first reduction gearset and a second reduction gearset at least in part on the first shaft;
• rotatably connecting a second shaft with the engine;
• rotatably supporting the second reduction gearset at least in part on the second shaft;
• selectively engaging and disengaging the first reduction gearset and the second reduction gearset with the first shaft while transmitting torque between the first shaft and the second shaft.