Patent ID: 7800361
Filing Date: 2010-09-21
Classification: F16C,F16J,G01D,G01P,H01F

Abstract:
1. A magnetic encoder constituting rotation detector in combination with a magnetic sensor fixed onto a stationary side member, said magnetic encoder comprising a metal reinforcing ring fitted into a rotary side member and a circular multipolar magnet fixed to said metal reinforcing ring with an adhesive, in which said circular multipolar magnet has a projecting portion on its surface projecting toward said metal reinforcing ring and a slant surface with a terminal end constituted by said projecting portion and a gap for an adhesive layer is formed between said slant surface and said metal reinforcing ring, wherein: said projecting portion is formed along the whole inner circumference of said circular multipolar magnet, said slant surface is formed so slant that the thickness of said circular multipolar magnet is gradually smaller from an inner circumferential side of said circular multipolar magnet to an outer circumferential side thereof, and said adhesive layer is formed such that it is gradually thinner from said outer circumferential side of said circular multipolar magnet to said inner circumferential side thereof.