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US 12,442,418 B2Granted
Sealing device and sealing structure
AssigneeNok Corporation
InventorYuya Sakano
Life of this patent
Estimating the term…
Abstract
A sealing device and a sealing structure with which an improvement is achieved in terms of suppressing the infiltration of foreign matter such as muddy water. An elastic seal includes a main lip, a side lip, and an intermediate lip, and a second annular recess formed along an outer peripheral surface of the side lip is recessed in a central axis direction of an inner ring and toward a sealing target space side by a greater depth than a first annular recess formed between the side lip and the intermediate lip.
Claims10
A sealing device for sealing an annular gap between an inner ring and an outer ring of a hub bearing, the sealing device comprising:
- a slinger having a cylindrical portion configured to be mounted on the inner ring, and an outward flange that is provided on an end of the cylindrical portion;
- and
- a seal body configured to be mounted on the outer ring and includes a reinforcing ring and an elastic seal formed from an elastomer material and provided integrally with the reinforcing ring,
- wherein the elastic seal includes:
- a main lip;
- a side lip that extends radially outwardly and toward an opposite side to a sealing target space, and contacts the outward flange;
- an intermediate lip that is provided between the main lip and the side lip, extends radially outwardly and toward the opposite side to the sealing target space, and contacts the outward flange,
- a first annular recess formed between the side lip and the intermediate lip;
- and
- a second annular recess formed along an outer peripheral surface of the side lip, wherein
- the second annular recess is recessed in a central axis direction of the inner ring and toward the sealing target space side by a greater depth than the first annular recess;
- and
- wherein a bottom of the second annular recess is positioned farther toward the sealing target space side in the central axis direction of the inner ring than a surface of the reinforcing ring outward flange on the side to which the outer ring is fitted,
- wherein the reinforcing ring includes a trunk portion having a convex shape oppositely facing and protruding towards the bottom of the second annular recess, and
- wherein the convex shape spans an entire length of the bottom of the second annular recess in a direction perpendicular to the central axis direction of the inner ring.
12 more elements
A sealing structure comprising:
- an inner ring having a columnar surface-shaped outer peripheral surface, a planar end surface, and a curved surface connecting the outer peripheral surface to the end surface;
- an outer ring provided concentrically with the inner ring;
- and
- a sealing device that seals an annular gap between the inner ring and the outer ring,
- the sealing device comprising:
- a slinger including a cylindrical portion that is mounted on the inner ring, and an outward flange that is provided on an end of the cylindrical portion;
- and
- a seal body that is mounted on the outer ring and includes a reinforcing ring and an elastic seal formed from an elastomer material and provided integrally with the reinforcing ring,
- wherein the elastic seal includes:
- a main lip;
- a side lip that extends radially outwardly and toward an opposite side to a sealing target space, and contacts the outward flange;
- and
- an intermediate lip that is provided between the main lip and the side lip, extends radially outwardly and toward the opposite side to the sealing target space, and contacts the outward flange,
- the cylindrical portion is mounted along the outer peripheral surface of the inner ring, the outward flange is mounted so as to closely contact the end surface of the inner ring, and the slinger includes a curved portion that is provided so as to connect the cylindrical portion to the outward flange and closely contacts the curved surface of the inner ring,
- wherein the sealing device includes a first annular recess formed between the side lip and the intermediate lip and a second annular recess formed along an outer peripheral surface of the side lip, and the second annular recess is recessed in a central axis direction of the inner ring and toward the sealing target space side by a greater depth than the first annular recess,
- wherein a bottom of the second annular recess is positioned farther toward the sealing target space side in the central axis direction of the inner ring than a surface of the reinforcing ring outward flange on the side to which the outer ring is fitted,
- wherein the reinforcing ring includes a trunk portion having a convex shape oppositely facing and protruding towards the bottom of the second annular recess, and
- wherein the convex shape spans an entire length of the bottom of the second annular recess in a direction perpendicular to the central axis direction of the inner ring.
15 more elements
Dependencies are inferred from the claim text.