IP Library › Granted Patent US 12,631,215
Granted Patent B2
US 12,631,215 · App. 17/772,499 · Granted May 19, 2026

Sliding components

Inventor: Minehiro Arai (Tokyo, JP)
Assignee: EAGLE INDUSTRY CO., LTD.
F16C33/16F16C33/74F16C2240/54
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Quick Facts
Patent No.
US 12,631,215
App. No.
17/772,499
Granted
May 19, 2026
Kind
B2
Abstract

Provided are sliding components capable of obtaining a stable low-friction effect under a wide range of conditions of use. A sliding component has a relatively sliding surface. A base material of one of the sliding components is coated with a graphite film, and the sliding surface of the other of the sliding components is made of the graphite film.

Claims (40)

1 . Sliding components having sliding surfaces sliding relative to each other,

wherein a base material of one of the sliding components is coated with a graphite film and the sliding surface of the one of the sliding components is made of the graphite film,

the base material is formed of ceramics,

the graphite film is brought into contact with the base material,

the graphite film has a thickness larger than an arithmetic mean roughness Ra of a surface of the base material,

the graphite film has a hexagonal crystal structure,

the graphite film has a ratio of a surface area of graphitized portion with respect to all of the surface area of the graphite film of 50% to 90%, and

the graphite film contains glassy carbon.

2 . The sliding components according to claim 1 , wherein the graphite film is lower in hardness than the sliding surface of remaining one of the sliding components.

3 . The sliding components according to claim 1 , wherein the graphite film is lower in hardness than the base material.

4 . The sliding components according to claim 1 , wherein an arithmetic mean roughness Ra of the surface of the base material is 0.1 μm or more.

5 . The sliding components according to claim 1 , wherein the graphite film is formed on only the sliding surface of the one of the sliding components sliding relative to each other.

6 . The sliding components according to claim 2 , wherein the graphite film is lower in hardness than the base material.

7 . The sliding components according to claim 2 , wherein an arithmetic mean roughness Ra of the surface of the base material is 0.1 μm or more.

8 . The sliding components according to claim 2 , wherein the graphite film is formed on only the sliding surface of the one of the sliding components sliding relative to each other.

9 . The sliding components according to claim 3 , wherein an arithmetic mean roughness Ra of the surface of the base material is 0.1 μm or more.

10 . The sliding components according to claim 3 , wherein the graphite film is formed on only the sliding surface of the one of the sliding components sliding relative to each other.

11 . Sliding components having sliding surfaces sliding relative to each other,

wherein a base material of one of the sliding components is coated with a graphite film and the sliding surface of the one of the sliding components is made of the graphite film,

the base material is formed of ceramics,

the graphite film is brought into contact with the base material,

an arithmetic mean roughness Ra of a surface of the base material is 0.1 μm or more,

the graphite film has a hexagonal crystal structure,

the graphite film has a ratio of a surface area of graphitized portion with respect to all of the surface area of the graphite film of 50% to 90%, and

the graphite film contains glassy carbon.

12 . The sliding components according to claim 11 , wherein the graphite film is lower in hardness than the sliding surface of remaining one of the sliding components.

13 . The sliding components according to claim 11 , wherein the graphite film is lower in hardness than the base material.

14 . The sliding components according to claim 11 , wherein the graphite film has a thickness larger than an arithmetic mean roughness Ra of a surface of the base material.

15 . The sliding components according to claim 11 , wherein the graphite film is formed on only the sliding surface of the one of the sliding components sliding relative to each other.

16 . Sliding components having sliding surfaces sliding relative to each other,

wherein a base material of one of the sliding components is coated with a graphite film and the sliding surface of the one of the sliding components is made of the graphite film,

the graphite film is lower in hardness than the base material,

the graphite film has a hexagonal crystal structure,

the graphite film has a ratio of a surface area of graphitized portion with respect to all of surface of the graphite film of 50% to 90%, and

the graphite film contains glassy carbon.

17 . The sliding components according to claim 16 , wherein

a base material of the other of the sliding components is made of ceramics, and

the sliding surface of the other of the sliding components is formed of the ceramics.

18 . The sliding components according to claim 16 , wherein

the base material of the one of the sliding components is made of ceramics.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 3, 2022
From: ARAI, MINEHIRO
To: EAGLE INDUSTRY CO., LTD.
Reel/Frame 060095/0277 →
Priority Claims (1)
JP 2019-207206 · Nov 15, 2019 · national
Continuity (1)
Related Publication 20220389961A1 · Dec 8, 2022
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