Rotation angle detection apparatus

摘要

Rotation angle detection apparatus includes a magnet provided in a main gear and a magnetism detector positioned to face to the magnet. Magnet rotates integrally with main gear and magnetism detector detects changes in magnetic field of magnet so a rotation angle of main gear is detected. Main gear includes bottomed recessed part and plurality of mounting pins arranged in recessed part. Magnet is inserted in recessed part wherein a part of magnet protrudes from an upper end of the recessed part. Magnet inserted in recessed part is pressed against main gear by an elastically deformable retaining plate made of non-magnetic material. An outer portion of retaining plate includes plurality of mounting holes. Magnet inserted in recessed part is pressed against main gear by elastically deformed retaining plate and mounting pins inserted in mounting holes are thermally caulked wherein magnet is secured to the main gear.

主权项

1. A rotation angle detection apparatus provided with: a rotor; a magnet retained in the rotor; and a magnetism detector positioned to face to the magnet,
the rotation angle detection apparatus being configured to detect a rotation angle of the rotor in such a way that the magnet rotates integrally with the rotor and the magnetism detector detects changes in magnetic field of the magnet, wherein
the rotor includes a bottomed recessed part and a plurality of mounting pins arranged in the recessed part,the magnet is inserted in the recessed part such that a part of the magnet protrudes from an upper end of the recessed part,the rotation angle detection apparatus includes an elastically deformable retaining plate made of non-magnetic material configured to press and hold the magnet inserted in the recessed part to the rotor,the retaining plate includes a center portion and an outer portion, the outer portion including a plurality of mounting holes in each of which the mounting pins are inserted, andthe magnet inserted in the recessed part is pressed at an outer peripheral edge against the rotor by the elastically deformed retaining plate and each of the mounting pins inserted one in each of the mounting holes is thermally caulked so that the magnet is secured to the rotor.