Sliding parts

Patent metadata

Field	Value
Publication number	US-9829043-B2
Application number	US-201414900064-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 18, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

By randomly arranging dimples provided on a sealing face, a sliding characteristic is improved in a wide range of a bearing characteristic number on the sealing face. A pair of sliding parts in which a plurality of dimples is arranged on at least one of sealing faces that relatively slide on each other is characterized in that each of the plurality of dimples is provided independently from the other dimples, and arranged in such a manner that the plurality of dimples having different opening diameters is randomly distributed.

First claim

The invention claimed is:

1. A pair of sliding parts respectively having sealing faces that slide relative to each other for sealing a sealed fluid that exists in inner or outer peripheries of the sealing faces, each of the sealing faces being a flat surface, wherein:
a plurality of dimples is arranged in a dimple formation region defined on at least one of sealing faces, the dimple formation region communicating with a high pressure fluid side and being isolated from a low pressure fluid side by only a flat surface portion of the sealing face, and, wherein:
at least some of the dimples have different opening diameters, each of the plurality of dimples being isolated from the other dimples by the sealing face in such a manner that the flat surface exists between adjoining dimples, the dimples being arranged in such a manner that the plurality of dimples having different opening diameters is randomly distributed.

2. The sliding parts as set forth in claim 1 , wherein:
the opening diameters of the plurality of dimples are set within a range from 30 to 100 μm.

3. The sliding parts as set forth in claim 1 , wherein:
depth of the plurality of dimples is set within a range from 50 to 1,000 nm.

4. The sliding parts as set forth in claim 1 , wherein:
the depth of the plurality of dimples is set within a range from 100 to 200 nm.

5. The sliding parts as set forth in claim 1 , wherein:
an area ratio of the plurality of dimples relative to the sealing face is 30 to 50%.

6. The sliding parts as set forth in claim 1 , wherein:
a plurality of the dimple formation regions are defined on the sealing face, and the dimple formation regions are arranged so that the flat surface exists between adjoining two of the dimple formation regions.

7. The sliding parts as set forth in claim 2 , wherein:
the dimple formation regions are aligned in a circumferential direction.

8. The sliding parts as set forth in claim 1 , wherein:
some of the dimples adjacent to the high pressure fluid side are opened at a circumferential surface of the sliding part to directly communicate with the high pressure fluid side.

9. The sliding parts as set forth in claim 1 , wherein:
more of the dimples having smaller opening diameters are distributed in comparison to the dimples having larger opening diameters.

Assignees

• Eagle Ind Co Ltd

Inventors

• Inoue Hideyuki
• NEGISHI Yuta
• Hosoe Takeshi
• TOKUNAGA Yuuichiro

Classifications

• F16C33/107

  Grooves for generating pressure · CPC title

• F16C17/02

  for radial load only · CPC title

• F16C33/74 Primary

  of sliding-contact bearings · CPC title

• F16J15/3424

  with microcavities · CPC title

• F16J15/3412 Primary

  with cavities (F16J15/3424 takes precedence) · CPC title