Sealing device

Patent metadata

Field	Value
Publication number	US-10119571-B2
Application number	US-201514750360-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jul 1, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A sealing device configured to seal a gap on a flange portion side between an outer member and an inner member by being attached to the outer member. A circular plate portion of a metal ring has an extending portion extending opposite to a flange portion. A seal body has a projecting portion and a weir portion, the projecting portion being positioned inward in a diametrical direction from the extending portion and extending toward the flange portion, the weir portion being positioned outward in a diametrical direction from the extending portion and extending toward the flange portion. The projecting portion and the weir portion overlap the extending portion in a diametrical direction, the projecting portion and the weir portion being provided adjacent to the extending portion, thereby forming a labyrinth. The labyrinth has a plurality of labyrinth constituting portions folding back along inner and outer faces of the extending portion in a diametrical direction, and the labyrinth is configured to meander.

First claim

The invention claimed is:

1. A sealing device configured to be provided for a mechanical apparatus having an inner member with a flange portion continuously enlarging in a diametrical direction and an outer member rotating relative to the inner member around a shaft of the mechanical apparatus, the sealing device being configured to seal a gap between the flange portion and an end face of the outer member facing the flange portion and between the outer member and the inner member by being attached to the outer member,
the sealing device comprising:
a core member attached to the outer member;
a seal body fixed to the core member; and
a metal ring having a cylindrical portion fitted to the inner member and having a circular plate portion extending outward in a diametrical direction from an end portion on the flange portion side of the cylindrical portion;
the circular plate portion having an extending portion extending opposite to the flange portion;
the seal body having a projecting portion and a weir portion, the projecting portion being positioned inward in a diametrical direction from the extending portion and extending toward the flange portion, the weir portion being positioned outward in a diametrical direction from the extending portion and extending toward the flange portion,
the projecting portion and the weir portion overlapping the extending portion in a diametrical direction, the projecting portion and the weir portion being provided adjacent to the extending portion, thereby forming a labyrinth, the labyrinth having a plurality of labyrinth constituting portions folding back along inner and outer faces of the extending portion in a diametrical direction, the labyrinth being configured to meander to prevent entry of muddy water, and the core member having a cylindrical portion and a circular plate portion, the cylindrical portion extending inward in the axial direction from an end portion of the cylindrical portion of the core member, the circular plate portion extending inward in a diametrical direction from the end portion of the cylindrical portion of the core member,
wherein the weir portion projects from the end portion of the cylindrical portion of the core member outward in the axial direction and toward a direction opposite to the direction to which the cylindrical portion of the core member extends in the axial direction, and a projection length of the weir portion in the axial direction from the end portion of the cylindrical portion of the core member is equal to or more than a projection length of the projecting portion in the axial direction, and
a length of the labyrinth between the projecting portion and the circular plate portion of the metal ring in the axial direction is smaller than a length of the labyrinth in the diametrical direction.

2. The sealing device as set forth in claim 1 ,
wherein the extending portion is configured to extend in parallel with the shaft, and the labyrinth comprises a first labyrinth constituting portion and a second labyrinth constituting portion, the first labyrinth constituting portion being configured to be parallel with the extending portion between the weir portion and the extending portion, the second labyrinth constituting portion being configured to be parallel with the extending portion between the projecting portion and the extending portion.

3. The sealing device as set forth in claim 1 , wherein the labyrinth further comprises an adjacent portion of the weir portion and the flange portion in the axial direction as a labyrinth constituting portion.

4. The sealing device as set forth in claim 1 , wherein the projecting portion is adjacent to the circular plate portion of the metal ring and the labyrinth further comprises an adjacent portion of the projecting portion and the circular plate portion of the metal ring as a labyrinth constituting portion.

5. The sealing device as set forth in claim 1 ,
wherein the seal body comprises a cover portion covering the cylindrical portion of the core member, and the weir portion is configured to be integral with the cover portion and to be greater in diameter than the cover portion.

6. A sealing device configured to be provided for a mechanical apparatus having an inner member with a flange portion continuously enlarging in a diametrical direction and an outer member rotating relative to the inner member around a shaft of the mechanical apparatus, the sealing device being configured to seal a gap between the flange portion and an end face of the outer member facing the flange portion and between the outer member and the inner member by being attached to the outer member,
the sealing device comprising:
a core member attached to the outer member; and
a seal body fixed to the core member;
the flange portion having an eave portion extending toward the seal body side;
the seal body having a projecting portion and a weir portion, the projecting portion being positioned inward in a diametrical direction from the eave portion and extending toward the flange portion, the weir portion being positioned outward in a diametrical direction further than the eave portion and extending toward the flange portion, and
the projecting portion and the weir portion overlapping the eave portion in a diametrical direction, the projecting portion and the weir portion being provided adjacent to the eave portion, thereby forming a labyrinth, the labyrinth having a plurality of labyrinth constituting portions folding back along inner and outer faces of the eave portion in a diametrical direction, the labyrinth being configured to meander to prevent entry of muddy water, and the core member having a cylindrical portion and a circular plate portion, the cylindrical portion extending inward in the axial direction from an end portion of the cylindrical portion of the core member, the circular plate portion extending inward in a diametrical direction from the end portion of the cylindrical portion of the core member,
wherein the weir portion projects from the end portion of the cylindrical portion of the core member outward in the axial direction and toward a direction opposite to the direction to which the cylindrical portion of the core member extends in the axial direction, and a projection length of the weir portion in the axial direction from the end portion of the cylindrical portion of the core member is equal to or more than a projection length of the projecting portion in the axial direction, and
a length of the labyrinth between the projecting portion and the circular plate portion of the metal ring in the axial direction is smaller than a length of the labyrinth in the diametrical direction.

7. The sealing device as set forth in claim 2 , wherein the labyrinth further comprises an adjacent portion of the weir portion and the flange portion in the axial direction as a labyrinth constituting portion.

8. The sealing device as set forth in claim 2 , wherein the projecting portion is adjacent to the circular plate portion of the metal ring and the labyrinth further comprises an adjacent portion of the projecting portion and the circular plate portion of the metal ring as a labyrinth constituting portion.

9. The sealing device as set forth in claim 3 , wherein the projecting portion is adjacent to the circular plate portion of the metal ring and the labyrinth further comprises an adjacent portion of the projecting portion and the circular plate portion of the metal ring as a labyrinth constituting portion.

10. The sealing device as set forth in claim 2 ,
wherein the seal body comprises a cover portion covering the cylindrical portion of the core member, and the weir portion is configured to be integral with the cover portion and

Assignees

• Uchiyama Mfg

Inventors

• Seno Hiroshi
• Shiotsuka Ai

Classifications

• F16J15/3232

  having two or more lips · CPC title

• F16C33/80

  Labyrinth sealings {(F16C33/761 takes precedence)} · CPC title

• F16J15/3264

  the elements being separable from each other · CPC title

• F16J15/4476

  with radial path · CPC title

• F16C33/805 Primary

  in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips · CPC title