BEARING APPARATUS WITH MAGNETIC ENCODER

摘要

PROBLEM TO BE SOLVED: To provide a bearing apparatus with a magnetic encoder capable of improving resistance to the occurrence of crevice corrosion in adverse environments by blocking the intrusion of salt water between a plastic magnet and a slinger while securing desired functions as a magnetic encoder for detecting the rotational speed of a rotator.

SOLUTION: A rolling bearing unit 2a for supporting axles comprises an outer ring 5a; a hub 7a and an inner ring 16a for rotating relatively to the outer ring 5a; a plurality of balls 17a rotation-freely arranged between the outer ring 5a and the hub 7a and the inner ring 16a; and the magnetic encoder 26 comprising both the slinger 25 mounted to the inner ring 16a and a magnetic-pole-forming ring 27 joined to the slinger 25 and containing a magnetic powder of 60-80 vol.% for detecting the rotational speed of both the hub 7a and the inner ring 16a. The slinger 25 has recession and protrusion parts 28 formed by blasting, and the magnetic-pole-forming ring 27 is adhered and joined only to the recession and protrusion parts 28.

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