COLLISION MITIGATION MECHANISM

[Object] The present invention mitigates damage from a collision, and realizes an improvement in fuel efficiency and reduction in environmental load. [Solution Means] When a collision occurs, a driving force of a drive shaft 12 is transmitted to a reversing high-load multiple disk clutch 850 via an inertia absorbing gear mechanism 840. Then, the driving force is transmitted to a gear 862 via a gear 866, and inertia is absorbed and the driving force acts to rotate an output shaft 14 at a low speed. On the other hand, when the gear 862 rotates, a regenerative/backing up motor 864 also rotates, and so-called regenerative driving is also performed. Due to these operations, the output shaft 14 rapidly decreases in rotation speed, and goes into a rotation stopping state from a forward rotating state. Then, when a vehicle speed sensor 304 detects that the vehicle speed has reached "0," the regenerative/backing up motor 864 is driven, the output shaft 14 is driven to rotate reversely for several seconds, and thereafter, driving of the regenerative/backing up motor 864 is stopped.