Sealing device for hub bearing
AssigneeNok Corporation
InventorsKenichi Tamura, Kazuki Hirota
Life of this patent
Estimating the term…
Abstract
A hub seal seals a gap between an outer race member and an inner race member of a hub bearing. The hub seal includes: an annular base; and a seal member attached to the base and including an annular elastic material. The seal member includes a side lip extending toward an outer side and an intermediate lip extending toward the outer side on an inner periphery side relative to the side lip. A sliding surface of the side lip that comes into contact to seal the gap between the outer race member and the inner race member is rougher than a sliding surface of the intermediate lip that comes into contact to seal the gap between the outer race member and the inner race member.
Claims14
A sealing device for a hub bearing for sealing a gap between an outer race member and an inner race member of a hub bearing, the sealing device comprising:
- a base having an annular shape around an axis;
- and
- an elastic body attached to the base, the elastic body including an elastic material having an annular shape around the axis, wherein
- the elastic body includes a side lip extending toward one side relative to a direction of the axis, an intermediate lip extending toward the one side on an inner periphery side relative to the side lip, and a grease lip,
- a seal surface of the side lip that is a surface that comes into contact to seal the gap has a surface roughness that is greater than that of a seal surface of the intermediate lip that is a surface that comes into contact to seal the gap,
- a position of a seal surface of the grease lip, the seal surface of the grease lip being a surface that comes into contact to seal the gap, is on an inner side of the grease lip that faces the seal surface of the intermediate lip, and
- a surface roughness of the seal surface of the grease lip is greater than that of the seal surface of the intermediate lip.
Dependencies are inferred from the claim text.