Belt retractor with an electromotive winding aid and method for activating an electromotive winding aid for a belt retractor

摘要

The invention relates to a belt retractor with an electromotive winding aid (4) comprising a belt shaft (1) which is pretensioned in the winding-up direction by a spring and is mounted rotatably in a frame (3) of the belt retractor on which a belt strap (2) can be wound up. The electromotive winding aid (4) can be activated as a function of the belt-strap-retraction speed (BRS).

主权项

1. A seat belt retractor for a seat belt comprising:
a belt shaft rotatably mounted in a frame of the seat belt retractor for winding the seat belt and a retractor spring for pretensioning the seat belt in a direction of winding of the seat belt; an electromotive winding aid acting on the belt shaft; and a control device for controlling the electromotive winding aid as a function of a seat belt feed rate, wherein the retractor spring provides a return force in the direction of winding of the seat belt, and the electromotive winding aid provides a further return force in the direction of winding, such that the return force and the further return force are added together to form a constant total return force or a total return force that corresponds to a predetermined curve to wind the seat belt in the direction of winding.