Patent ID: 9611892
Date: 2017-04-04
CPC Classifications: A01K,F16C,F16J

Claim:
1. A magnetic fluid sealed bearing, comprising: a bearing body, the bearing body including an inner ring, an outer ring, and a plurality of rolling members interposed between the inner ring and the outer ring; a pair of ring-shaped magnets disposed in an annular space between the inner ring and the outer ring, the pair of ring-shaped magnets being disposed on each side of the bearing body in an axial direction with the rolling members interposed therebetween; polar plates retaining the magnets respectively; and magnetic fluid retained by a magnetic circuit formed by the pair of magnets to seal the rolling members, wherein the pair of magnets are magnetized such that magnetic poles point in the axial direction of the bearing body, and opposing sides of the pair of magnets have different magnetic polarities from each other; and wherein the magnetic fluid is retained either between the polar plates and an outer circumferential surfaces of the inner ring or between the polar plates and an inner circumferential surface of the outer ring.