Synchronous belt drive for driving ball screw in electromechanical steering mechanism for motor car, has belt wheel comprising helical gearing whose outer contour comprises arc shaped profile in section by rotational axis

摘要

The drive has a toothed belt comprising a helical gearing, and a belt wheel (22a) with a rotational axis (21a). Another helical gearing (24a) of the belt wheel is combined with the former helical gearing of the toothed belt. An outer contour of the latter helical gearing of the belt wheel comprises an arc shaped profile in a section by the rotational axis, where the profile deviates in a cylindrical manner. A contact point of a tooth of the belt wheel with the toothed belt lies in a range of 0.02 to 0.5 of width of the toothed belt.