Lubricant composition

A lubricating oil composition and composition technology, applied in the direction of lubricating composition, petroleum industry, base materials, etc., can solve problems such as oil film rupture resistance to sintering, extreme pressure reduction, gear fatigue life degradation, etc.

Active Publication Date: 2018-01-02
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a method of improving fuel economy, for example, it is conceivable to use low-viscosity gear oil to reduce viscous resistance, but this method is prone to oil film rupture and reduced seizing resistance. New problems such as fatigue life deterioration

Method used

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  • Lubricant composition
  • Lubricant composition
  • Lubricant composition

Examples

Experimental program
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Effect test

Embodiment 1～5 and comparative example 1～10

[0099] The lubricating oil composition was prepared in the compounding quantity (mass %) shown in Table 1 and Table 2. Their properties are shown in Table 1 and Table 2, respectively. In addition, the detail of a component is as follows.

[0100] Base oil A: Poly-α-olefin (PAO), kinematic viscosity at 100°C: 2mm 2 / s, viscosity index: 117

[0101] Base oil B: poly-alpha-olefin (PAO), kinematic viscosity at 100°C: 4mm 2 / s, viscosity index: 117

[0102] Base oil C: Poly-α-olefin (PAO), kinematic viscosity at 100°C: 100mm 2 / s, viscosity index: 117

[0103] Base oil D: poly-alpha-olefin (PAO), kinematic viscosity at 100°C: 150mm 2 / s, viscosity index: 117

[0104] Base oil E: Ester base oil, kinematic viscosity at 100°C: 4mm 2 / s, viscosity index: 139

[0105] Base oil F: Mineral oil classified in Group III of the API base oil category, kinematic viscosity at 100°C: 2mm 2 / s, viscosity index: 116

[0106] Base oil G: Mineral oil classified in Group III of the API base...

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Abstract

Provided is a lubricant composition which has achieved a good balance between fuel consumption saving and extreme-pressure properties, while having shear stability, oxidation stability and wear resistance. Specifically, provided is a lubricant composition which is characterized by containing a base oil, a viscosity index improver, a molybdenum-based friction modifier, a boron-containing dispersant, and a sulfur/phosphorus-based extreme-pressure additive or at least two extreme-pressure additives selected from among a sulfur-based extreme-pressure additive, a phosphorus-based extreme-pressure additive and a sulfur/phosphorus-based extreme-pressure additive, and which is also characterized in that: the base oil is composed only of a synthetic oil; the base oil has a kinematic viscosity of from 3 mm2/s to 10 mm2/s (inclusive) at 100 DEG; the viscosity index improver is a resin having a number average molecular weight (Mn) of from 1,000 to 10,000 (inclusive); the mass ratio of the boron atoms (B) contained in the boron-containing dispersant to the molybdenum atoms (Mo) contained in the molybdenum-based friction modifier, namely (B)/(Mo) is from 1 to 5 (inclusive); and the mass ratio ofthe sulfur atoms (S) contained in the extreme-pressure additive(s) to the phosphorus atoms (P) contained in the extreme-pressure additive(s), namely (S)/(P) is from 10 to 20 (inclusive).

Description

technical field [0001] This invention relates to lubricating oil compositions. Background technique [0002] Lubricating oil compositions are used in various fields, for example, for internal combustion engines used in gasoline engines, diesel engines, and other internal combustion engines, or for gear devices (gears). Commonly required performances in these applications include fuel economy and improvement by reducing the coefficient of friction or the coefficient of traction. For example, Patent Document 1 discloses a lubricating oil composition in which poly-α-olefin (PAO) is blended into a base oil to reduce frictional loss and thereby provide excellent fuel economy. [0003] In addition, lubricating oil compositions are required to have specific performances according to applications in addition to common performances such as fuel economy. For example, lubricating oil compositions for gear devices are further divided into high-speed and high-load gears such as automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M161/00C10M135/00C10M137/00C10M139/00C10M143/00C10N10/12C10N20/02C10N20/04C10N30/00C10N30/06C10N30/10C10N40/04
CPCC10M161/00C10N2040/25C10N2040/04C10N2030/06C10M2205/0285C10M2207/2805C10M2203/1025C10M2205/022C10N2020/04C10M2209/084C10M2223/041C10M2223/049C10M2219/022C10M2215/28C10M2215/08C10M2219/068C10N2030/02C10N2030/68C10N2030/10C10M169/044C10N2020/02C10M2205/024C10N2060/14C10N2010/12C10M139/00C10M135/00C10M137/00C10M143/00C10M105/32C10M107/02C10M111/04C10M133/06C10M135/04C10M135/22C10M137/02C10M137/08C10M137/10C10M143/04C10M2205/0206C10M2215/26C10M2219/082C10M2223/043C10M2223/047C10M2227/00C10M2227/066
Inventor 砂川洋二
Owner IDEMITSU KOSAN CO LTD
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