Patent ID: 8308370

Claim:
A sealing device for a radial bearing including an inner ring, an outer ring and rolling elements interposed between the inner and outer rings, the sealing device comprising: a slinger which includes a radially inner circumferential edge portion fit to the inner ring and a body plate for axially obstructing an annular opening formed between the inner and outer rings; and a sliding seal portion which includes: an axial base surface facing the body plate of the slinger with forming an axial seal clearance between the axial base surface and the body plate at an axially inner side of the slinger; a radially outer circumferential edge which is formed at a radially outer end of the axial base surface and is fit to the outer ring; a main seal lip which is formed at a radially inner end of the axial base surface and is slide-contacted with an outer side of an axial end portion of the inner ring; and a sub-seal lip which extends from the axial base surface in the axial seal clearance so that a slide contact edge at a distal end portion of the sub-seal lip is slide-contacted with the body plate, wherein the sub-seal lip abuts against the inner surface of the body plate by being elastically deformed such that a slide contact area between the slide contact edge and the inner surface of the body plate has a substantially annular band shape; wherein the sub-seal lip is elastically deformed so as to be inclined toward the axial base surface by a centrifugal force generated due to rotation of the outer ring, and wherein a radial width of the annular band shape of the slide contact area is reduced towards the slide contact edge with increase in the centrifugal force.