Power train system for vehicle

摘要

A power train system for a vehicle is disclosed, in which the vehicle is provided with front wheels and rear wheels, one of which are main drive wheels and the other of which are subsidiary drive wheels. The system comprises a first power source arranged to power the main drive wheels and a second power source arranged to power the subsidiary drive wheels. The system further comprises a wheel coupling shaft mechanically coupled with the subsidiary drive wheels and a power distribution device mechanically coupled with the wheel coupling shaft and the second power source to perform power distributions to and from the wheel coupling shaft.