| 摘要 |
A seat belt retractor absorbs impact by deforming a roll made of steel just like reversely rolling up. When acceleration exceeds a threshold for example in the event of vehicle collision, a lock gear is locked by a lock activating mechanism and pawls engage some of internal teeth of a lock base. A webbing is loaded with significantly large tension by the occupant being moved forward due to the acceleration so that extremely large torque is applied to the lock base from the reel through the pawls. Because of this torque, the steel roll plastically deforms just like being reversely rolled up from the inner end so that the webbing is gradually unwound, thereby softening impact acting on the occupant by the webbing.
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