| 摘要 |
A vehicle seat belt tightening system for taking up slack from a seat belt in high acceleration or deceleration condition to positively restrain a vehicle occupant but otherwise permitting the seat belt to be paid out to accommodate a movement of the vehicle occupant, comprising: a retractor unit comprising a winding spool, a seat belt tightening unit arranged at a seat belt outlet end of the retractor unit, a drive unit for selectively activating the seat belt tightening unit, and a deceleration detection unit for acting upon the seat belt tightening unit, which are integrally mounted on a common frame. Thus, the reliability of the system is improved and the installing and the servicing of the system is simplified. In particular, the operation reliability may be improved if the reverse rotation of the seat belt tightening unit is prevented by a ratchet mechanism in which a ratchet wheel received in a mutually spaced relationship in an opening provided with inner ratchet teeth and the ratchet wheel is adapted to be displaced into meshing engagement with the inner ratchet teeth of the opening when the ratchet wheel is pulled by tension from the seat belt.
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