Abstract: A power transmission system for transmitting power from a crank shaft of an engine to a drive shaft of a transmission gear box via a clutch assembly is disclosed. The clutch assembly facilitates co-rotation of the crank and drive shaft when engaged and allows relative rotation between the crank and drive shaft when not engaged. The system includes an electric motor with an input/output shaft and a gear assembly coupled to the input/output and drive shaft. Rotation of the drive shaft is transmitted to rotation of the input/output shaft via the gear assembly and rotation of the input/output shaft is transmitted to rotation of the drive shaft via the gear assembly. The drive shaft is drivable by the engine via the crank shaft when the clutch assembly is engaged and is drivable by the electric motor via the input/output shaft and gear assembly when the clutch assembly is not engaged.

Abstract: One embodiment of an electric drive system includes first and second gear assemblies coupled to a hollow axle tube, and first and second electric motors respectively coupled to the first and second gear assemblies. Further, the electric drive system includes first and second drive axles positioned within the hollow axle tube. The first drive axle includes a first end portion coupled to a first wheel and a second end portion coupled to the first gear assembly. Similarly, the second drive axle includes a first end portion coupled to a second wheel spaced-apart from the first wheel and a second end portion coupled to the second gear assembly. Actuation of the first electric motor rotates the first drive axle and first wheel via the first gear assembly and actuation of the second electric motor rotates the second drive axle and second wheel via the second gear assembly.