JP2016193995A5 - - Google Patents

Claims (13)

A lubricating oil composition comprising (A) a lubricating base oil, (B) a molybdenum compound, and (C) an ashless friction modifier,
The (B) molybdenum compound includes a dinuclear organic molybdenum compound represented by the following general formula (I), and the molybdenum atom content of the dinuclear organic molybdenum compound is 0.030 based on the total amount of the lubricating oil composition. Mass% or more and 0.140 mass% or less,
The (C) ashless friction modifier includes (C1) an ester ashless friction modifier and (C2) an amine ashless friction modifier, and (C1) an ester ashless friction modifier and (C2 ) A lubricating oil composition in which the total content of amine-based ashless friction modifier is more than 0.1% by weight and 1.8% by weight or less based on the total amount of the lubricating oil composition.

[In Formula (I), R ^{1 to} R ⁴ represent a hydrocarbon group having ⁴ to 22 carbon atoms, and R ^{1 to} R ⁴ may be the same or different. X < ¹ > -X < ⁴ > represents a sulfur atom or an oxygen atom. ]   The lubricating oil composition according to claim 1, wherein the (C1) ester-based ashless friction modifier is an ester compound having one or more hydroxyl groups in the molecule.   The lubricating oil composition according to claim 2, wherein the ester compound having one or more hydroxyl groups in the molecule is glycerin monooleate. Ratio of the content of the (C2) amine-based ashless friction modifier and the content of the (C1) ester-based ashless friction modifier [(C2) Content of the amine-based ashless friction modifier / (C1 The lubricating oil composition according to any one of claims 1 to 3 , wherein the content of the) content of the ester-based ashless friction modifier] is less than 1.00. Furthermore, the lubricating oil composition of any one of Claims 1-4 containing the boron modified body of (D) succinimide. The lubricating oil composition according to claim 5 , wherein the boron-modified content of the boron-modified succinimide (D) is 0.050% by mass or less based on the total amount of the lubricating oil composition. The mass of the total content of the (C1) ester-based ashless friction modifier and the (C2) amine-based ashless friction modifier with respect to the boron atom content of the boron-modified succinimide (D). Ratio [content of boron modification of (D) succinimide modified boron / (content of (C1) ester-based ashless friction modifier + content of (C2) amine-based ashless friction modifier) The lubricating oil composition according to claim 5 or 6 , wherein the amount] is 0.011 or more. Additionally, (E) poly (meth) lubricating oil composition according to any one of claims 1 to 7 including the acrylates. The lubricating oil composition according to any one of claims 1 to 8 , further comprising (F) a metal-based detergent. The lubricating oil composition according to any one of claims 1 to 9 including the (G) zinc dithiophosphate. (A) the lubricating base oil, the base oil classification American Petroleum Institute, any one of claim 1 to 10 at least one selected from mineral oil or synthetic oil is classified into the group 3 and group 4 The lubricating oil composition described in 1. The lubricating oil composition according to any one of claims 1 to 11 , which is used for an internal combustion engine. A method for reducing friction in an internal combustion engine, wherein the lubricating oil composition according to any one of claims 1 to 11 is added to the internal combustion engine.