System having DLC contacting faces, method for lubricating the system and lubricating oil for the system

A contact surface, lubricant technology, applied in the system field, can solve the problems of low friction characteristics, reducing effect, etc.

Active Publication Date: 2006-11-15
NIPPON OIL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, it has been reported that DLC materials having excellent low-friction properties in air have only a limited friction-reducing effect in the presence of lubricants (Non-Patent Literature Publication 1); Lubricants of organomolybdenum compounds do not produce sufficient friction reducing effect in DLC materials (Non-Patent Document Publication 2)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative Embodiment 1

[0178] Embodiment 1-9 and comparative example 1 and comparative example

[0179] A DLC-coated gasket for a train engine valve was prepared to measure engine motor torque as an example of a low-friction system DLC contact surface.

[0180] Gasket Preparation: The test piece was prepared by polishing a SUJ2 heat-treated material to have a predetermined surface roughness (Ra=0.2um or less).

[0181] Using VCD treatment, the obtained surface was coated with a-C (invisible carbon) type DLC to have a thickness of 1.1 μm, and polished to a surface roughness (Ra=0.04um) with a wrapping tape, and the surface hardness Hv reached 1800. .

[0182] Lubricant preparation

[0183] represents lubricants according to the invention (Examples 1-9), Comparative Example 1 and sulfur-containing molybdenum lubricants (Comparative Example)

[0184] In Table 1, base oil I is a severely hydrocracked mineral oil having a dynamic viscosity of 24.0 mm2 / s at 100°C, a viscosity index of 125, an aromatic...

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Abstract

The present invention relates to a system wherein a pair of relatively movable, facing DLC contact surfaces at least one of which is coated with a DLC film, are further lowered in friction, and the low friction property is stably maintained. The present invention also relates to a lubricant for the system, and a lubricating method. The lubricant for the system having the DLC contact surfaces contains lubricant base oil (A) mainly composed of base oil (X), and sulfur-containing molybdenum complex (B). The base oil (X) is at least one of hydrocracked mineral oils, wax-isomerized mineral oils, and poly-+--olefin base oils, and has a kinematic viscosity of 2 to 20 mm 2 / s at 100 DEG C, a total aromatic content of not higher than 5 mass%, and a total sulfur content of not higher than 0.005 mass%.

Description

technical field [0001] The present invention relates to a system, such as an internal combustion engine, having a pair of relatively movable, face-to-face diamond-like carbon (DLC) contact surfaces, wherein at least one of the contact surfaces is coated with DLC. In particular, the present invention relates to a system, For internal combustion engines, the system has both DLC-coated and non-DLC-coated contact surfaces. The invention also relates to a lubricant for use in the above system and a method of lubricating a system with a DLC contact surface with the lubricant. Background technique [0002] Recently, global environmental problems have attracted attention, such as global warming and ozone depletion. especially CO 2 The release is quite interesting, it is said to have a significant impact on global warming, and countries are concerned about its regulation standards. [0003] CO 2 One of the main challenges of reduction is to reduce energy losses due to frictional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M101/02C10M107/02C10M129/00C10M133/00C10M135/00F01M11/00F16H57/04
CPCY02T10/86
Inventor 小西正三郎加纳真上野贵文石川贵朗
Owner NIPPON OIL CO LTD
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