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Lubricating oil composition

a technology of lubricating oil and composition, which is applied in the direction of lubricant composition, additives, petroleum industry, etc., can solve the problems of low removal efficiency and increase wear amount, and achieve the effect of high fuel efficiency, durability and piston detergency in internal combustion engines

Inactive Publication Date: 2015-08-06
IDEMITSU KOSAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a lubricating oil that can improve fuel efficiency, durability and piston detergency in internal combustion engines. It can achieve this at a high level.

Problems solved by technology

In this case, it is known that metal fractions mix in exhaust gas streams and deposit in aftertreatment devices to lower the removal efficiency.
However, a too low HTHS viscosity increases a wear amount.

Method used

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  • Lubricating oil composition

Examples

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Effect test

examples

[0103]The present invention is described in more detail with reference to the following Examples. The present invention is not limited to the following Examples.

[Properties Measurement of Lubricating Oil Composition]

(1) Kinematic Viscosity (at 40° C. and 100° C.)

[0104]Measured according to ASTM D445.

(2) Viscosity Index of Base Oil

[0105]Measured according to “Test Method for Kinematic Viscosity of Petroleum Products” defined in JIS K 2283.

(3) CCS Viscosity of Composition

[0106]Measured according to ASTM D2602.

(4) NOACK Value of Composition

[0107]Measured according to ASTM D5800.

(5) HTHS Viscosity (High-Temperature High-Shear Viscosity), at 80° C., 100° C., 150° C.

[0108]Measured according to ASTM D4683.

(6) Phosphorus and Calcium Content

[0109]Measured according to JPI-5S-38-92.

[Properties Evaluation]

[0110]300 ml of a sample oil was heated in a heating tank at 100° C., and splashed on an aluminium plate arranged on the top of the heating tank and heated at 300° C. using feathers, and this...

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Abstract

[Problem]To provide a lubricating oil composition capable of attaining high-level fuel efficiency, durability and piston detergency in internal-combustion engines.[Means for Resolution]The lubricating oil composition according to the present invention contains a viscosity index improver and a metallic detergent in at least one base oil selected from mineral oils and synthetic oils therein, wherein the viscosity index improver contains a polymethacrylate viscosity index improver and an olefin copolymer viscosity index improver, the polymethacrylate viscosity index improver is contained in an amount of from 3.0% by mass to 9.5% by mass based on the total amount of the lubricating oil composition, the metallic detergent is at least one selected from calcium sulfonate, calcium phenate and calcium salicylate, the calcium amount derived from the metallic detergent is from 500 ppm to 1500 ppm based on the total amount of the lubricating oil composition, the high-temperature high-shear viscosity at 150° C. of the lubricating oil composition is 2.6 mPa·s or more, the high-temperature high-shear viscosity at 80° C. of the lubricating oil composition is 7.8 mPa·s or less, and the ratio of the high-temperature high-shear viscosity at 100° C. of the lubricating oil composition to the high-temperature high-shear viscosity at 150° C. thereof is 2.05 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating oil composition for use in internal-combustion engines such as diesel engines, gasoline engines, gas engines, engines for hybrid cars, etc.BACKGROUND ART[0002]At present, with the surge of the consciousness for the environment on the earth scale, implementation of measures against environmental issues such as global warming, etc., as well as against depletion of oil resources is desired. In vehicle-related fields, emission control, development of fuel-efficient automobiles and others are much more desired.[0003]For measures for emission control, employed are exhaust gas filters such as diesel particulate filters, gasoline particulate filters and the like for removing metal fractions (also referred to as ash fractions) derived from lubricating oil compositions used in internal-combustion engines, and exhaust-gas aftertreatment devices such as ternary catalysts, oxidation catalysts, etc.[0004]In this case, it is known...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M161/00
CPCC10M161/00C10M169/048C10N2240/104C10N2240/102C10N2240/10C10N2230/74C10N2230/68C10N2230/54C10N2230/50C10N2230/42C10N2230/10C10N2230/06C10N2230/04C10N2230/02C10M2223/045C10M2215/28C10M2215/221C10M2209/084C10M2207/026C10M2205/04C10M2205/026C10M2205/022C10M2207/027C10N2210/02C10M2207/028C10M2207/144C10M2207/262C10M2219/044C10M2219/046C10N2220/021C10M2205/06C10M2205/028C10N2030/04C10N2030/02C10N2030/10C10N2030/50C10N2030/42C10N2030/54C10N2030/68C10N2030/74C10N2030/06C10N2040/252C10N2040/255C10N2040/25C10N2020/04C10N2010/04
Inventor ITO, KOKIFUJIMOTO, KOSUKEYAMASHITA, MINORU
Owner IDEMITSU KOSAN CO LTD
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