# US 2010/0163353 A1 · Friction couple

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- Number: US 2010/0163353 A1
- Document ID: US20100163353A1
- Status: Published application
- Kind: A1
- Application number: 12/576,528
- Filed: 2009-10-09
- Published: 2010-07-01
- Earliest claimed: 2008-10-10
- Assignees: Toyota Jidosha Kabushiki Kaisha; Advics Co., Ltd.
- Inventors: Kenji ABE; Masaaki Nishiwaki; Hiroshi Isono; Hiroyuki Fujikawa; Satoshi Wakamatsu; Yoshio Shimura; Yuji Nagasawa
- Web page: https://patentgrep.com/patent/US20100163353A1

## CPC

- F16D 69/027: {Compositions based on metals or inorganic oxides}
- F16D 13/60: Clutching elements (friction lining or attachment thereof F16D69/00)
- F16D 69/00: Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces (clutching elements F16D13/60; braking members F16D65/02)
- F16D 69/028: {containing fibres}
- F16D 2069/003: {Selection of coacting friction materials}
- F16D 2069/005: {having a layered structure}
- F16D 2300/10: Surface characteristics; Details related to material surfaces
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A friction couple including: a first friction member that contains a metallic material and includes a first friction surface; and a second friction member that includes a second friction surface that contacts the first friction surface and that contains an oxidation film developer that accelerates formation of an oxidation film on at least one of the first friction surface and the second friction surface by oxidizing the metallic material when the first friction surface and the second friction surface contact each other.

## Claims

### Claim 1

A friction couple comprising:
a first friction member that contains a metallic material and includes a first friction surface; and
a second friction member that includes a second friction surface that contacts the first friction surface and that contains an oxide film developer that accelerates formation of an oxide film on at least one of the first friction surface and a second friction surface by oxidizing the metallic material when the first friction surface and the second friction surface contact each other.

### Claim 2 (depends on 1)

The friction couple according to claim 1, wherein the metallic material is iron or an iron compound.

### Claim 3 (depends on 1)

The friction couple according to claim 1, wherein the second friction member contains, as the oxide film developer, at least one of a single metallic element and a metallic compound that are less likely oxidized than the metallic material.

### Claim 4 (depends on 3)

The friction couple according to claim 3, wherein the single metallic element is at least one of copper, tin, cobalt, indium, iridium, silver, bismuth, gold, platinum, rhodium, and palladium.

### Claim 5 (depends on 3)

The friction couple according to claim 3, wherein the metallic compound contains at least one of copper, tin, cobalt, indium, iridium, silver, bismuth, gold, platinum, rhodium, and palladium.

### Claim 6 (depends on 1)

The friction couple according to claim 1, wherein the second friction member contains, as the oxide film developer, two or more metallic oxides that contain same metallic atoms whose oxidation numbers are different.

### Claim 7 (depends on 1)

The friction couple according to claim 1, wherein the second friction member contains at least one of a-Fe2O3 and Fe3O4 as the oxide film developer.

### Claim 8 (depends on 1)

The friction couple according to claim 1, wherein the second friction member contains a-Fe2O3 and Fe3O4 as the oxide film developer.

### Claim 9 (depends on 1)

The friction couple according to claim 1, wherein the metallic material is iron or a iron compound, and the second friction member contains, as the oxide film developer, a substance that has a stronger tendency to be negatively charged than iron.

### Claim 10 (depends on 9)

The friction couple according to claim 9, wherein the substance that has a stronger tendency to be negatively charged than iron is at least one of copper, platinum, silicon, silver, sulfur, polyethylene, polypropylene, polyurethane, rayon, polyester, and vinyl resin.

### Claim 11 (depends on 1)

The friction couple according to claim 1, wherein the second friction member contains, as the oxide film developer, a substance that acts as an oxidation catalyst by friction.

### Claim 12 (depends on 11)

The friction couple according to claim 11, wherein the second friction member contains, as the substance that acts as the oxidation catalyst by friction, at least one of TiO2, BaTiO3, ZrO2, and p-type semiconductor.