The invention relates to a belt tightening drive for tightening a safety belt which can be wound up around a winding shaft, said belt tightening drive comprising an electric motor, a spindle shaft and a output wheel coupled with the winding shaft and a worm gear, by way of which the output wheel is driven by the spindle shaft, wherein for the formation of the worm gear an external helical gear of the output wheel is combing with a worm drive supported torsionally rigid on the spindle shaft and it is provided according to the invention that the external gear of the output wheel comprises at least two gear sections, wherein a first gear section comprises a gear with constant geometry and a following second gear section is designed with an increasing root circle diameter and/or increasing tip circle diameter and/or increasing tooth thickness.
Belt tensioner drive
2015-09-29
Patent
Electronic Resource
English
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |