Sealing apparatus

Patent metadata

Field	Value
Publication number	US-2019277403-A1
Application number	US-201916423250-A
Country	US
Kind code	A1
Filing date	May 28, 2019
Priority date	Nov 25, 2016
Publication date	Sep 12, 2019
Grant date	—

Abstract

A sealing apparatus which seals an annular gap of a hole into which a shaft is to be inserted, includes a sealing apparatus body to be fitted into the hole, and a slinger to be attached to the shaft. The sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion attached to the reinforcing ring and annular around the axis line. The slinger includes a flange portion extending toward an outer periphery side and annular around the axis line. The elastic body portion includes an end-face lip extending on one side in an axis line direction, contacting the flange portion from another side in the axis line direction, and annular around the axis line. At least one groove is formed on the other side of the flange portion, and a plurality of projections are formed side by side in a circumferential direction on an inner periphery surface of the end-face lip extending in a spiral manner in a rotation direction of the shaft from the other side to the one side and being formed on an inner periphery side of a slinger contact portion of the end-face lip.

First claim

What is claimed is:

1 . A sealing apparatus for sealing an annular gap between a shaft and a hole into which the shaft is to be inserted, the sealing apparatus comprising:
a sealing apparatus body to be fitted into the hole; and a slinger to be attached to the shaft, wherein the sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion which is formed with an elastic body attached to the reinforcing ring and which is annular around the axis line, the slinger includes a flange portion which is a portion extending toward an outer periphery side and annular around the axis line, the elastic body portion includes an end-face lip which is a lip extending toward one side in the axis line direction, contacting the flange portion from another side in the axis line direction, and annular around the axis line, at least one groove is formed on the other side of the flange portion of the slinger, a plurality of projections are formed side by side in a circumferential direction on a surface on an inner periphery side of the end-face lip, and the projections extend in a spiral manner in a rotation direction of the shaft from the other side toward the one side, and are formed on an inner periphery side of a slinger contact portion which is a portion where the end-face lip contacts the slinger at the end-face lip.

2 . The sealing apparatus according to claim 1 ,
wherein the projections are formed at intervals from the slinger contact portion at the end-face lip.

3 . The sealing apparatus according to claim 2 ,
wherein the projections are formed at intervals from the slinger contact portion so as to reach a pumping region from a circular current region in the sealing apparatus.

4 . The sealing apparatus according to claim 1 , wherein the projections partially overlap with the projections adjacent on a side of a rotation direction of the shaft when seen from an inner periphery side to an outer periphery side in the axis line direction.

5 . A sealing apparatus for sealing an annular gap between a shaft and a hole into which the shaft is to be inserted, the sealing apparatus comprising;
a sealing apparatus body to be fitted into the hole; and a slinger to be attached to the shaft, wherein the sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion which is formed with an elastic body attached to the reinforcing ring and which is annular around the axis line, the slinger includes a flange portion which is a portion extending toward an outer periphery side and annular around the axis line, the elastic body portion includes an end-face lip which is a lip extending toward one side in an axis line direction, contacting the flange portion from another side in the axis line direction and annular around the axis line, at least one groove is formed on the other side of the flange portion of the slinger, a plurality of projections are formed side by side in a circumferential direction at regular intervals on a surface on an inner periphery side of the end-face lip, and the projections extend so that at least tip portions are along a rotation direction of the shaft.

6 . The sealing apparatus according to claim 5 ,
wherein the tip portions are formed by being bent from predetermined positions of body portions of the projections, and the tip portions extend so as to be along a rotation direction of the shaft.

7 . The sealing apparatus according to claim 5 ,
wherein the tip portions are formed by being bent in a crank shape or in an S shape from predetermined positions of body portions of the projections, and the tip portions extend so as to be along a rotation direction of the shaft.

8 . The sealing apparatus according to claim 5 ,
wherein the projections are formed while being wholly curved in a convex shape from an inner periphery side toward an outer periphery side of the end-face lip, and the tip portions extend so as to be along a rotation direction of the shaft.

9 . The sealing apparatus according to claim 5 ,
wherein the projections partially overlap with each other when seen from an inner periphery side to an outer periphery side in the axis line direction.

10 . A sealing apparatus for sealing an annular gap between a shaft and a hole into which the shaft is to be inserted, the sealing apparatus comprising:
a sealing apparatus body to be fitted into the hole; and a slinger to be attached to the shaft, wherein the sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion which is formed with an elastic body attached to the reinforcing ring and which is annular around the axis line, the slinger includes a flange portion which is a portion extending toward an outer periphery side and annular around the axis line, the elastic body portion includes an end-face lip which is a lip extending toward one side in an axis line direction, contacting the flange portion from another side in the axis line direction, and annular around the axis line, at least one groove is formed on the other side of the flange portion of the slinger, a plurality of main projections are formed side by side in a circumferential direction on a surface on an inner periphery side of the end-face lip, and in addition to the plurality of main projections, a plurality of sub-projections which are parallel to the plurality of main projections and which are shorter than the plurality of main projections are formed on the surface on the inner periphery side of the end-face lip.

11 . The sealing apparatus according to claim 10 ,
wherein the plurality of sub-projections are alternately disposed between the plurality of main projections.

12 . The sealing apparatus according to claim 10 ,
wherein the plurality of sub-projections are disposed closer to an end portion on the outer periphery side than the plurality of main projections.

13 . The sealing apparatus according to claim 10 , wherein the main projections and the sub-projections are formed on an inner periphery side of a slinger contact portion which is a portion where the end-face lip contacts the slinger at the end-face lip.

14 . The sealing apparatus according to claim 10 ,
wherein the main projections and the sub-projections partially overlap with each other when seen from the inner periphery side to the outer periphery side in the axis line direction.

15 . A sealing apparatus for sealing an annular gap between a shaft and a hole into which the shaft is to be inserted, the sealing apparatus comprising:
a sealing apparatus body to be fitted into the hole; and a slinger to be attached to the shaft, wherein the sealing apparatus body includes a reinforcing ring annular around an axis line, and an elastic body portion which is formed with an elastic body attached to the reinforcing ring and which is annular around the axis line, the slinger includes a flange portion which is a portion extending toward an outer periphery side and annular around the axis line, the elastic body portion includes an end-face lip which is a lip extending toward one side in an axis line direction, contacting the flange portion from another side in the axis line direction, and annular around the axis line, at least one groove is formed on the other side of the flange portion of the slinger, normal rotation projections and reverse rotation projections are alternately formed side by side in a circumferential direction on a surface on the inner periphery side of the end-face lip, the normal rotation projections include a

Assignees

• Nok Corp

Inventors

• Sakano yuya
• Matsui Hiroki
• Hamamoto Kokichi
• Nakagawa Takehiro
• YONAI Hisato
• Inoue Masahiko

Classifications

• F16J15/3256

  comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals · CPC title

• F16J15/3456

  without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip · CPC title

• F16J15/3204

  with at least one lip · CPC title

• F16J15/3244 Primary

  with hydrodynamic pumping action · CPC title

• F16J15/164 Primary

  the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid · CPC title