Rotation detecting device

摘要

A steering output part is fixed with a worm wheel (15) for power assist. By a spur gear (15b) formed on the worm wheel, an input gear (22a) of a detecting unit (20) is rotated with a speed increase. Within the detecting unit, provided is a speed-reducing mechanism for speed-reducing the rotation of the detecting shaft (22). By this speed reduction, a detection rotating member provided in a case rotates at an angle of 1 : 1 to the rotation of the steering output part, a rotation angle of which is detected by a detecting element.