Patent ID: 8203333
Filing Date: 2012-06-19
Classification: B62D,G01D

Abstract:
1. A rotation angle detecting device comprising: a housing; a rotating shaft rotatably held by the housing; a driving gear having a plurality of teeth and fixed to the rotating shaft; a driven gear having a plurality of teeth and engaged with the driving gear; a magnetic field generating part fixed in the driven gear, having a permanent magnet, and configured to generate a magnetic field; a magnetic sensor element configured to detect a change in the magnetic field due to a rotational movement of the magnetic field generating part; a signal processor configured to process a signal from the magnetic sensor element for detecting a rotation angle of the rotating shaft, and a screw receiver held by the housing and screwed with the driven gear, wherein: each of the teeth of the driving gear has a first circumferential width on an addendum circle that connects radial-outside surfaces of the teeth of the driving gear; each of the teeth of the driven gear has a second circumferential width on an addendum circle that connects radial-outside surfaces of the teeth of the driven gear; the second circumferential width is greater than the first circumferential width; the screw receiver has a female screw surface; each of the radial-outside surfaces of the teeth of the driven gear has a male screw surface screwed with the female screw surface; and the rotating shaft is a steering shaft of a vehicle.