Lubricant oil composition for internal combustion engine

Abstract

A lubricant oil composition for internal combustion engines with which further reduction of friction can be achieved to provide excellent fuel efficiency is provided. (A) A lubricant oil base oil having a kinematic viscosity at 100° C. of 2.0 to 5.0 mm2 / s; (B) a molybdenum-based friction modifier in an amount of 0.005 to 0.2 mass % in terms of the mass of the molybdenum relative to the total mass of the composition; (C) a metal-based detergent in an amount of 0.01 to 1 mass % in terms of the mass of the metal relative to the total mass of the composition; and (D) 0.01 to 10 mass % of at least one compound selected from amino acids having a C6-24 alkyl, alkenyl, or acyl group, and / or derivatives of the amino acids.

Description

TECHNICAL FIELD[0001]The present invention relates to a fuel-efficient lubricant oil composition for internal combustion engines.BACKGROUND ART[0002]The trend for improving the fuel efficiency of automobiles since the wake of the oil crisis remains an important issue in light of resource protection and environmental protection, and the need for improved fuel efficiency has been higher. The conventional approach for improving the fuel efficiency of automobiles includes vehicle weight reduction, improvement of engine combustion, and reduction of friction in engines and the drive train. Low engine friction is achieved through improving the valve train mechanism, reducing the surface roughness of sliding members, and using a fuel-efficient lubricant oil composition for internal combustion engines (engine oil).[0003]Among them, the use of a fuel-efficient engine oil is gaining the acceptance in the market because of its high cost effectiveness. As an effort to achieve high fuel efficienc...

AI Technical Summary

Benefits of technology

The lubricant oil composition described in this patent has the benefits of low friction and good fuel efficiency in internal combustion engines. This means that the oil helps to reduce the resistance when moving parts in the engine move, and it also helps to save fuel by improving the engine's performance.

Problems solved by technology

However, a problem of the molybdenum-based friction modifier is that increasing its content produces only a limited friction reducing effect.

There is also a stability problem due to formation of precipitates.

Another drawback is that use of the molybdenum-based friction modifier with ester- or amine-based ashless friction modifiers hardly improves the friction reducing effect.

In today's environment where the demand for more fuel efficient lubricants continues to increase, the conventional engine oils are insufficient in terms of fuel efficiency.

However, adding of these modifiers in a lubricant oil composition for internal combustion engines, and a synergistic effect on reducing friction by using these modifiers with molybdenum-based friction modifiers have not been known.

Such an effect also has not been anticipated by a skilled artisan.

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