Patent ID: 7045998
Filing Date: 2006-05-16
Classification: B62D,G01D

Abstract:
1. A rotation detecting device comprising: a case; an automotive steering shalt is provided with a power assist rotator to which an assist power is to be provided; a detecting shaft to be rotated by the power assist rotator, extending inside and outside the case and rotatably supported; an input gear provided at an outside of the case and fixed to the detecting shaft; a speed-reducing mechanism provided in the case and for speed-reducing a rotation of the detecting shaft; a detection rotating member to be rotated by the speed-reducing mechanism so that a speed of the detection rotating member is less than a speed of the rotation of the detecting shaft; and a detecting member for detecting a rotation angle of the detection rotating member; wherein provided is a speed-increasing mechanism for delivering a rotation with speed increase from the automotive steering shaft as a subject of detection to the input gear, a rotation force from the automotive steering shaft being delivered to the detection rotating member through the speed-increasing mechanism and the speed-reducing mechanism, a rotation angle of the detection rotating member being set at one-Nth of a rotation angle of the automotive steering shaft where N is an integer and N≧2; wherein the speed-reducing mechanism is isolated from the speed-increasing mechanism by the case, wherein the speed-increasing mechanism is coupled to the automotive steering shaft and the speed-reducing mechanism is coupled to the detecting shaft, and wherein a gear is integrally formed on the power assist rotator, the input gear provided on the detecting shaft being in mesh with the gear formed on the power assist rotator.