Surface processing method of disk member of sealing apparatus, and sealing apparatus

Patent metadata

Field	Value
Publication number	US-11698105-B2
Application number	US-201916754536-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	Oct 31, 2018
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

A sealing apparatus which is capable of preventing static leakage of a target to be sealed without increasing sliding resistance with respect to a shaft, and a surface processing method of a disk member of the sealing apparatus which is capable of processing a surface of the disk member, such as a slinger, provided at the sealing apparatus. A surface processing method of a disk member of a sealing apparatus for forming a plurality of fine spiral grooves on a surface of the disk member provided at the sealing apparatus has a grinding member having a plurality of fine projections that is moved to an outer edge side while the grinding member is pressed against the surface of the disk member which relatively rotates around an axis, and the sealing apparatus includes a slinger at which a plurality of fine spiral grooves are randomly formed on another side surface of a flange portion.

First claim

The invention claimed is:

1. A surface processing method of a disk member of a sealing apparatus for forming a plurality of fine spiral grooves on a surface of the disk member provided at the sealing apparatus, the surface processing method comprising:
moving a grinding member having a plurality of fine projections to an outer edge side while pressing the grinding member against the surface of the disk member which relatively rotates around a shaft,
wherein a polishing material which is obtained by applying abrasive grains for polishing on base cloth and which is fixed with an adhesive is used as the grinding member, and wherein, as a result of the abrasive grains being randomly arranged, dropping or moving on a surface of the polishing material, the grooves have a random shape where intervals between the grooves are not constant and where relative motion of the grinding member with respect to the disk member and shapes of the grooves does not match, and
wherein the grooves include grooves which have positions being displaced in a radial direction in each lap, grooves which break halfway, and grooves whose spiral shapes are not the same.

2. The surface processing method of the disk member of the sealing apparatus according to claim 1 ,
wherein a surface of the grinding member, which abuts on the surface of the disk member is the polishing material.

3. The surface processing method of the disk member of the sealing apparatus according to claim 1 ,
wherein, after the disk member rotates one or more revolutions while the grinding member is pressed against the surface of the disk member, the grinding member is moved to the outer edge side of the disk member.

4. The surface processing method of the disk member of the sealing apparatus according to claim 1 ,
wherein the disk member is a slinger which is provided at the sealing apparatus for realizing sealing of an annular gap between a shaft and a hole into which the shaft is to be inserted, along with a sealing apparatus body fitted into the hole, and which is attached to the shaft,
the sealing apparatus body includes a reinforcing ring which is 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 other side surface of the flange portion in the axis line direction and annular around the axis line, and
a surface against which the grinding member is to be pressed is the other side surface of the flange portion of the slinger.

5. A sealing apparatus for realizing sealing of 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 fitted into the hole; and
a slinger attached to the shaft,
wherein the sealing apparatus body includes a reinforcing ring which is 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 which is 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 other side surface of the flange portion in the axis line direction, and annular around the axis line, and
a plurality of fine spiral grooves are randomly formed on the other side surface of the flange portion of the slinger, wherein
the grooves include grooves which have positions being displaced in a radial direction in each lap, grooves which break halfway, and grooves whose spiral shapes are not the same.

6. The sealing apparatus according to claim 5 ,
wherein a depth of the grooves falls within a range between 2 μm and 20 μm.

Assignees

• Nok Corp

Inventors

• YONAI Hisato
• Sakano yuya
• Inoue Masahiko

Classifications

• B24B7/10 Primary

  Single-purpose machines or devices (grinding tools or machines specially designed for use on assembled railway track E01B31/17) · CPC title

• F16C33/74 Primary

  of sliding-contact bearings · CPC title

• F16J15/328 Primary

  Manufacturing methods specially adapted for elastic sealings (moulding B29C) · CPC title

• F16J15/3232

  having two or more lips · CPC title

• B24B29/04

  for rotationally symmetrical workpieces, e.g. ball-, cylinder- or cone-shaped workpieces · CPC title