Sealing device

Patent metadata

Field	Value
Publication number	US-2016003302-A1
Application number	US-201514750360-A
Country	US
Kind code	A1
Filing date	Jun 25, 2015
Priority date	Jul 1, 2014
Publication date	Jan 7, 2016
Grant date	—

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

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 on the flange portion side 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, and 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, and the labyrinth being configured to meander.

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 weir portion is adjacent to the flange portion and the labyrinth further comprises an adjacent portion of the weir portion and the flange portion 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 and the labyrinth further comprises an adjacent portion of the projecting portion and the circular plate portion as a labyrinth constituting portion.

5 . The sealing device as set forth in claim 1 ,
wherein the core member comprises a cylindrical portion fitted to an outer circumference of the outer member and a circular plate portion extending inward in a diametrical direction from the end portion on the flange portion side of the cylindrical portion, the seal body comprises a cover portion covering the cylindrical portion, 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 on the flange portion side 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, and the labyrinth being configured to meander.

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

10 . The sealing device as set forth in claim 2 ,
wherein the core member comprises a cylindrical portion fitted to an outer circumference of the outer member and a circular plate portion extending inward in a diametrical direction from the end portion on the flange portion side of the cylindrical portion, the seal body comprises a cover portion covering the cylindrical portion, and the weir portion is configured to be integral with the cover portion and to be greater in diameter than the cover portion.

11 . The sealing device as set forth in claim 3 ,
wherein the core member comprises a cylindrical portion fitted to an outer circumference of the outer member and a circular plate portion extending inward in a diametrical direction from the end portion on the flange portion side of the cylindrical portion, the seal body comprises a cover portion covering the cylindrical portion, and the weir portion is configured to be integral with the cover portion and to be greater in diameter than the cover portion.

12 . The sealing device as set forth in claim 4 ,
wherein the core member comprises a cylindrical portion fitted to an outer circumference of the outer member and a circular plate portion extending inward in a diametrical direction from the end portion on the flange portion side of the cylindrical portion, the seal body comprises a cover portion covering the cylindrical portion, and the weir portion is configured to be integral with the cover portion and to be greater in diameter than the cover portion.

Assignees

• Uchiyama Mfg

Inventors

• Seno Hiroshi
• Shiotsuka Ai

Classifications

• F16C33/805 Primary

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

• F16J15/3232

  having two or more lips · CPC title

• F16C2326/02

  Wheel hubs or castors · CPC title

• F16J15/447

  Labyrinth packings · CPC title

• F16C19/186

  with three raceways provided integrally on parts other than race rings, e.g. third generation hubs · CPC title