Magnetic encoder and wheel support bearing assembly utilizing the same

Abstract

To substantially eliminate deficiencies such as portions of the resinous coating, where the film thickness is reduced considerably during the press-fitting, and to aim at providing a high productivity with a reduced cost and without the possibility of occurrence of rusting after a prolonged time of use under severe environmental conditions due to an excellent anticorrosive property, a magnetic encoder () includes a multipolar magnet () having a plurality of alternating magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal () supporting the multipolar magnet (). The multipolar magnet () is formed of a sintered element prepared by mixing and sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder. The multipolar magnet () is fixed on the core metal () by staking a portion of the core metal (), and a sintered element/core metal assembly () fixed on the core metal () is surface treated to have with an anticorrosive resinous coating () for anticorrosive purpose. When the magnetic encoder is press-fitted on an encoder carrier member, one of a press-fitting punch and the magnetic encoder () is heated to a temperature within the range of 60 to 150° C.