Lubricating oil composition for continuously variable transmission

A technology of lubricating oil composition and speed changer, which is applied in the direction of lubricating composition, petroleum industry, additives, etc., can solve the problems such as the inability to meet the requirements of fuel saving, and achieve improved fuel economy, high power transmission force, and low traction coefficient Effect

Active Publication Date: 2015-04-01
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oil cannot meet recent demands for further fuel saving

Method used

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  • Lubricating oil composition for continuously variable transmission
  • Lubricating oil composition for continuously variable transmission
  • Lubricating oil composition for continuously variable transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4

[0193] (Examples 1 to 4, Comparative Examples 1 to 3)

[0194] Table 1 shows the viscosity-temperature characteristics, EC×V40, shear test (JASO sonic method, 20 hours) of the lubricating oil compositions of the present invention (Examples 1 to 4) and those used for comparison (Comparative Examples 1 to 3) The results of the viscosity reduction rate, and the measured value of the traction coefficient.

Embodiment 5 to 12

[0195] (Examples 5 to 12, Comparative Examples 4 to 10)

[0196] Table 2 shows the intermetallic friction coefficients, transmission clutch characteristics (static friction coefficient, μ0 / μd), and anti-aliasing properties of lubricating oil compositions of the present invention (Examples 5 to 12) and those used for comparison (Comparative Examples 4 to 10). The result of the measured value of the jitter.

[0197] [Table 1]

[0198]

[0199] [Table 2]

[0200]

[0201] As shown in Tables 1 and 2, the lubricating oil composition of the present invention maintained a high metal-to-metal friction coefficient, was excellent in transmission clutch characteristics and anti-shudder properties, and was able to achieve further improvement in fuel economy due to a low traction coefficient.

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Abstract

Provided is a lubricating oil composition for a continuously variable transmission, said composition exhibiting a low viscosity whilst maintaining the viscosity required of the lubricating oil composition throughout a period of use in a mechanism, and maintaining a high friction coefficient between metals so as to ensure a high power-transmitting force provide the wet clutch friction characteristics and the shudder prevention properties required in a transmission. The composition also achieves improved fuel economy due to a low traction coefficient. In the composition, (B) a phosphorus compound, (C) a calcium salicylate and / or a calcium sulfonate, (D) a boron-modified ashless dispersant, and (E) a friction regulating agent are included, each at a specified amount, in a base-oil that has been adjusted so that the product (ECxV40) of the mass percent (EC(mass%)) of a saturated cyclic component, as based on the total base-oil mass, and the kinematic viscosity (V40(mm2 / s)) at 40 DEG is equal to or less than 500, and the kinetic viscosity at 100 DEG is 3.6-4.1mm2 / s. The lubricating oil composition has a kinematic viscosity at 100 DEG of 5.2-5.6mm2 / s and a viscosity index of equal to or greater than 165.

Description

technical field [0001] The present invention relates to a lubricating oil composition for continuously variable transmissions, and more particularly to a lubricating oil composition suitable for metal belt continuously variable transmissions of automobiles having improved fuel economy. Background technique [0002] In recent years, in order to deal with environmental problems such as reduction of carbon dioxide emissions, energy saving, ie, fuel saving, of automobiles, construction machines, and agricultural machines has become an urgent need, and systems such as engines, transmissions, final reduction gears), compressors or hydraulic power units contribute to energy savings. [0003] As one of means for saving fuel in transmissions, the use of continuously variable transmissions has been continuously expanding. This is to maximize fuel economy by driving the internal combustion engine under the most efficient driving conditions. [0004] In addition, the continuously vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M129/76C10M133/16C10M137/02C10M139/00C10M159/22C10M159/24C10N20/02C10N30/00C10N30/02C10N30/06C10N40/04
CPCC10M169/045C10M2203/1065C10M2207/281C10M2215/08C10M2219/046C10M2207/262C10N2020/02C10N2020/019C10N2030/02C10N2030/06C10N2030/42C10N2030/45C10N2030/54C10N2030/68C10N2030/76C10N2040/045C10N2060/14C10N2010/04C10M141/10
Inventor 大沼田靖之菖蒲纪子福水崇裕山下实小川仁志西之园纯一
Owner JX NIPPON OIL & ENERGY CORP
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