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A seat belt retractor for a vehicle with a rotatably mounted belt reel on which a seat belt can be wound and unwound has a biased motive spring that acts on the belt reel to produce a pulling force which acts on the seat belt, and during winding and unwinding follows a characteristic curve which is

A seat belt retractor for a vehicle with a rotatably mounted belt reel on which a seat belt can be wound and unwound has a biased motive spring that acts on the belt reel to produce a pulling force which acts on the seat belt, and during winding and unwinding follows a characteristic curve which is dependent on the extracted length of belt webbing. An electric motor drive adjusts the bias of the motive spring in such a way that the pulling force follows a characteristic curve corresponding to room temperature, which is approximately 20.degree. C., at any temperature.

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[ I claim:] [1.]1. A seat belt retractor comprising a rotatably mounted belt reel on which a seat belt is wound and unwound, a biased motive spring which acts on the belt reel to produce a pulling force which acts on the seat belt and, during winding and unwinding, follows a characteristic curve whi

[ I claim:] [1.]1. A seat belt retractor comprising a rotatably mounted belt reel on which a seat belt is wound and unwound, a biased motive spring which acts on the belt reel to produce a pulling force which acts on the seat belt and, during winding and unwinding, follows a characteristic curve which is dependent on the extracted length of belt webbing, and an electric motor drive with which the pulling force produced by the motive spring can be adjusted, bias of the motive spring is adjusted by the drive in such a way that the pulling force follows a characteristic curve corresponding to room temperature, which is approximately 20.degree. C., at any temperature.