Patent ID: 8920035

Claim:
A rolling bearing used in a power transmission device for transmitting power such as turning force, the rolling bearing characterized in that at least one magnet for holding in a lubrication portion of said rolling bearing a lubricating magnetic fluid for lubricating said lubrication portion is provided on at least one side of an outer race of the rolling bearing, and an annular yoke made of a magnetic material loosely fitted to a rotating shaft is provided on the opposite side of said magnet relative to said outer race, and a cross-sectional profile of the yoke has an I-shape, wherein a projecting portion is provided on a side of the annular yoke facing the magnet, a plurality of cylindrical or rectangular recessed portions is provided in a circumferential direction in said projecting portion, the recessed portions opening toward the outer race side of the rolling bearing, and the at least one magnet being fitted into each of the recessed portions.