Belt tightener, safety belt device, and method for operating a safety belt device
AssigneeDaimler AG
InventorTill HEINRICH
Life of this patent
Estimating the term…
Abstract
A belt tightener for tightening a safety belt in a vehicle includes an impulse screw drive unit to generate a greater torque than can be achieved by a mechanical coupling between a motor and the belt tightener.
Claims12
1-10. (canceled)
A belt tightener for tightening a safety belt in a vehicle, the belt tightener comprising:
- an impulse screw drive unit.
A safety belt device of a vehicle, comprising:
- a belt retractor, comprising a shaft operatively configured to unwind and wind a safety belt in the vehicle;
- and
- a belt tightener comprising an impulse screw drive unit.
A method for operating a safety belt device of a vehicle, the safety belt device comprising a belt retractor, comprising a shaft operatively configured to unwind and wind a safety belt in the vehicle and a belt tightener coupled to a controller and comprising an impulse screw drive unit, wherein the impulse screw drive unit comprises an electric motor, a container, and an output component, the method comprising:
- activating, by the controller, the belt tightener and specifying, by the controller, a tightening force based on collision-relevant information before occurrence of a detected impending collision of the vehicle;
- activating a first ignition stage of the belt tightener at a specific tightening force;
- and
- activating a second ignition stage of the belt tightener at a further specific tightening force,
- wherein the further specific tightening force that activates the second ignition stage is higher than the specific tightening force that activates the first ignition stage, wherein, in the first ignition stage, the output component is rotated so as to correspond with the electric motor, and
- wherein, in the second ignition stage, the output component is rotated relative to the electric motor in a pulse-like manner.
Dependencies are inferred from the claim text.