Rotation angle detection device

摘要

The present invention relates to a rotation angle detection device mainly used for rotation angle detection of a steering wheel of an automobile and the like.;In the rotation angle detection device of the present invention, support portions for supporting lower surfaces of magnets and retention portions for retaining upper surfaces of the magnets are provided in respective accommodation portions of first and second detection bodies. The magnets are turned in the accommodation portions, and the magnets are press-fitted into lower surfaces of the retention portions so as to be retained and fixed between the support portions and the retention portions. Thereby, an inexpensive rotation angle detection device in which the magnets can be easily and reliably installed in the detection bodies with a simple configuration without individually using holders can be realized.

主权项

1. A rotation angle detection device, comprising:
a rotation body rotated in conjunction with a steering; a first detection body rotated in conjunction with the rotation body; a cuboid first magnet installed in a first accommodation portion which is provided in a center of the first detection body; a first magnetism detection element arranged so as to face the first magnet; and control means for detecting a rotation angle of the rotation body by a detection signal from the first magnetism detection element, wherein the first accommodation portion includes a first support portion for supporting a first surface of the first magnet, and a pair of first retention portions for retaining a second surface opposite to the first surface of the first magnet, each of the pair of first retention portions protruding inward at an inner periphery of the first accommodation portion, wherein the each of the first retention portions has a downward first inner inclination portion, and a substantially arc shape upper support wall portion having a predetermined radius from a rotation axis of the first detection body, on a lower surface of the first retention portion, the second surface of the first magnet is retained by pressing both lateral ends of longitudinal ends of the second surface of the first magnet onto the first inner inclination portions, and the first magnet is installed in the first accommodation portion by supporting both the longitudinal ends of the first magnet using the upper support wall portions.