Bearing sealing device
AssigneeNtn Corporation
InventorYoshitaka Okaji
Life of this patent
Estimating the term…
Abstract
A bearing sealing device includes two seals (inner and outer seals) sealing the space between the inner and outer races of a bearing to ensure higher seal performance, and also to reduce the area of the inner periphery of the outer race that needs to be ground. The bearing sealing device includes a ring constituted by a metal annulus, and a rubber part. The metal annulus is formed by cold pressing, and has a seal contact surface kept in contact with seal lips of the outer seal. The rubber part includes a press-fitted portion fixed to the inner periphery of the outer race. The inner race has, on its outer periphery, a cylindrical fitting surface to which the outer seal is press-fitted.
Claims7
A bearing sealing device for a bearing including an inner race having a raceway surface on an outer periphery of the inner race, an outer race having an raceway surface on an inner periphery of the outer race, the bearing sealing device comprising:
- a seal groove in the inner periphery of the outer race;
- an inner seal including a radially outer portion fixed in the seal groove;
- an outer seal including a radially inner portion fixed to the outer periphery of the inner race, and a seal lip;
- and
- a ring having a press-fitted portion fixed to the inner periphery of the outer race, and a seal contact surface with which the seal lip of the outer seal is in contact,
- wherein the outer seal is located outwardly of the inner seal;
- wherein the seal lip of the outer seal is one of a plurality of seal lips of the outer seal, and another of the plurality of seal lips is an outermost seal lip located at an outermost position of the bearing among the plurality of seal lips,
- wherein a labyrinth gap is defined between the outermost seal lip and the inner periphery of the outer race,
- wherein a seal lip or seal lips of the plurality of seal lips other than the outermost seal lip are in contact with the seal contact surface of the ring, and
- wherein the outer race has an end surface, and the labyrinth gap comprises an axial gap portion defined between the ring and the outermost seal lip, and a radial gap portion defined between the end surface of the outer race and the outermost seal lip.
Dependencies are inferred from the claim text.