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Lubricant composition

A lubricating oil composition, lubricating oil technology, applied in the direction of lubricating composition, petroleum industry, base materials, etc., can solve the problems that have not been discussed, and achieve long metal fatigue life, low viscosity, low temperature fluidity and excellent oxidation stability Effect

Inactive Publication Date: 2009-07-29
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of all these compositions on fatigue life when lowering the viscosity of lubricating oils is not discussed at all

Method used

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  • Lubricant composition
  • Lubricant composition
  • Lubricant composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4 and comparative example 1～6

[0121] Lubricating oil compositions having the components shown in Table 2 were prepared, and physical properties other than oxidation stability were evaluated. The results are shown in Table 2.

[0122] Oxidation stability was evaluated for Example 1 and Comparative Example 1. The results are shown in Table 3.

[0123]

[0124]

[0125] table 3

[0126]

[0127] The results in Table 2 show that the low-temperature viscosity (-40°C) of the lubricating oil compositions of the present invention (Examples 1-4) is less than 10,000, and the fatigue life [L50] exceeds 150 minutes, good low-temperature fluidity, and long metal fatigue life . In contrast, the fatigue life [L50] of Comparative Examples 1 to 4 and Comparative Example 6 was less than 150, and the metal fatigue life was short; and the low-temperature viscosities (-40°C) of Comparative Examples 1, 4, and 6 exceeded 10,000, and the low-temperature fluidity was poor. .

[0128] On the other hand, the fatigue li...

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Abstract

Disclosed is a lubricant composition containing a lubricant base oil and 0.5-10% by mass of an ethylene / a-olefin copolymer (A) having a number average molecular weight of 2,800-8,000. A lubricant base oil having a kinematic viscosity at 100 DEG C of 1.5-40 mm / s, a viscosity index of not less than 100, a pour point of not more than -25 DEG C, and a sulfur content of not more than 0.01% by mass is used in this lubricant composition. This lubricant composition has low viscosity and long metal fatigue life, while being excellent in low-temperature fluidity and oxidation stability. Consequently, this lubricant composition is particularly useful as a lubricant for automobile transmissions or the like.

Description

technical field [0001] The present invention relates to a lubricating oil composition, and more specifically, to a lubricating oil composition that has low viscosity, excellent low-temperature fluidity and oxidation stability, and has a long metal fatigue life, and is particularly suitable as a lubricating oil for automobile transmissions, etc. thing. Background technique [0002] In recent years, in response to environmental problems, energy saving of automobiles, construction machinery, agricultural machinery, etc., that is, fuel consumption saving has become a top priority, and engines, transmissions, final reducers, compressors, hydraulic devices, etc. that contribute to energy saving are urgently needed device. Therefore, the lubricating oil used in these devices needs to reduce stirring resistance and frictional resistance more than ever. [0003] For example, as one of the methods of reducing fuel consumption in transmissions and final reduction gears, there is a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M101/02C10M135/36C10M137/04C10M137/08C10M143/00C10N20/00C10N20/02C10N20/04C10N30/00C10N30/02C10N30/08C10N30/10C10N40/02C10N40/04C10N40/08C10N40/25
CPCC10M143/02C10N2230/43C10N2240/04C10M2225/00C10N2230/06C10M2219/106C10M2205/02C10N2230/08C10M2205/022C10M161/00C10N2230/02C10M2209/084C10N2030/02C10N2030/08C10N2030/43C10N2040/04C10N2030/06C10M2205/024C10N2020/04C10N2020/02C10M2205/028C10M171/00C10M135/36C10M137/04
Inventor 山田亮高仓丰
Owner IDEMITSU KOSAN CO LTD
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