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Low-friction sliding mechanism

a sliding mechanism and low friction technology, applied in the direction of mechanical equipment, shafts and bearings, lubricant compositions, etc., to achieve the effect of excellent ultra-low friction characteristics and low shearing stress compounds

Inactive Publication Date: 2009-05-07
NISSAN MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a low-friction sliding mechanism that can exhibit a highly excellent ultra-low friction characteristics in sliding faces existing under various applications. The mechanism includes a lubricant containing hydroxyl group and sliding members with hard carbon thin films formed thereon. The hard carbon thin film is a diamond-like carbon thin film formed of amorphous carbon and / or tetrahedral carbon. The mechanism can reduce friction loss in sliding sections of machines and improve fuel economy in vehicles. The technical effect of the invention is to improve the performance of sliding mechanisms in machines and vehicles, particularly in reducing friction and improving fuel economy.

Problems solved by technology

Global environmental problems such as global warming and ozone layer destruction of whole the earth are coming to the fore.

Method used

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Examples

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example

[0061]Hereinafter, the present invention will be discussed with reference to Examples and Comparative Examples; however, the present invention is not limited to these Examples.

examples 1 to 9

, and Comparative Examples 1 to 3

[0062]As shown in FIG. 3, as a sliding mechanism of each Example, a reciprocating sliding friction tester was used in which a reciprocating pin was pressed on a fixed disc plate wetted with a lubricating oil. At this time, a load is 400 N, the pin had a dimension of 22 mm×18 mm diameter, and a plate had a dimension of 8 mm×24 mm.

[0063]Additionally, friction sliding specimens of respective Examples were produced according to the specifications of materials as shown in Table 1 mentioned below.

[0064]The plate was formed of SCM415 carburized steel and of cemented carbide in a part of Examples.

[0065]Additionally, 5 ml of a lubricant shown in Table 1 was dropped on the obtained plate in such a manner that the surface of the plate was uniformly wetted with the lubricant.

[0066]In Examples 1 to 9 and Comparative Examples 1 and 2, glycerol 100% was used as the lubricant.

[0067]In Comparative Example 3, a lubricant used was prepared by adding 1.0% of GMO (glycer...

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Abstract

[Summary][Object] To provide a low-friction sliding mechanism capable of exhibiting an extremely excellent ultra-low friction characteristics at a sliding face existing in a variety of uses.[Solving means] A low-friction sliding mechanism is constituted by disposing a lubricant containing glycerol, at a sliding face formed between sliding members which have respectively hard carbon thin films. A low-friction sliding mechanism is constituted by disposing a lubricant containing hydroxyl group, at a sliding face formed between sliding members which have respectively hard carbon thin films, wherein a friction coefficient of smaller than 0.02 is exhibited in a sliding contacting condition under a boundary lubrication which exhibits a friction coefficient of 0.1 to 0.14 at a sliding face between a steel and a steel in presence of an engine oil. Each hard carbon thin film is formed of a-C or ta-C. Each hard carbon thin film has a hardness of 1500 to 5000 Hv in micro-Vickers hardness under a load of 10 g. Each hard carbon thin film has a film thickness of 0.3 to 2.0 μm. The lubricant containing hydroxyl group is one of alcohols, and is glycerol.

Description

TECHNICAL FIELD[0001]This invention relates to a low-friction sliding mechanism, and more particularly to a low-friction sliding mechanism capable of improving a friction characteristics of a variety of sliding faces, for example, in an internal combustion engine or a drive-system transmission machine.BACKGROUND ART[0002]Global environmental problems such as global warming and ozone layer destruction of whole the earth are coming to the fore. As it has been said that the global warming is significantly affected by CO2 emission, the reduction of CO2 emission, notably the setting of CO2 emission standards, has become a big concern to each country.[0003]One of challenges to reduce CO2 emission is to lower an energy loss due to friction loss of machines, facilities and the like, particularly to improve a fuel economy of motor vehicles, in which sliding materials and lubricants play important roles.[0004]The roles of the sliding materials are to demonstrate an excellent wear resistance a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M129/06
CPCC10M105/14C10N2230/06F16C33/16C10N2280/00C10N2240/10C10N2030/06C10N2040/25C10N2080/00C10M5/00F16C33/10F16C33/12F16C33/24
Inventor MARTINKANO, MAKOTOSAGAWA, TAKUMARUWATANABE, MASAHIKO
Owner NISSAN MOTOR CO LTD
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