Patent ID: 6065879
Filing Date: 2000-05-23
Classification: F16C,F16J

Abstract:
A rolling bearing unit with a speed detecting encoder comprising a rotating outer race member, a stationary inner race member, a plurality of rolling elements provided between the rotating outer race member and stationary inner race member, a seal unit which is provided for sealing an opening portion of the bearing unit and comprised of an outer sealing member fixed to the rotating outer race member and rotating therewith so that a centrifugal force is produced radially toward the outer race member during rotation of said outer sealing member along with said outer race member, said outer sealing member being placed in sliding contact with the stationary inner race member where a small relative circumferential speed at the sliding contact is produced, an inner sealing member located closer to the rolling elements in an axial direction of the rolling bearing unit than said outer sealing member, fixed to the stationary inner race member and placed in sliding contact with the rotating outer race member, and an intermediate seal lip which extends from one of the outer and inner sealing members so as to be in sliding contact with the other seal member, and the speed detecting encoder mounted to the outer sealing member, located on the radially outer side of the sealing portion of the outer sealing member, and made of a magnetic rubber, wherein the centrifugal force produced during said rotation prevents any foreign matter from penetrating a space where said rolling elements are provided.