Lubricating oil composition

Abstract

Provided is a lubricating oil composition containing a base oil (A), a metal-based cleaning agent (B) containing a magnesium sulfonate (B1), a boron-modified succinimide (C), and an organic zinc dithiophosphate (D), wherein the atomic content of phosphorus is 500-900 mass ppm on the basis of the total amount of the lubricating oil composition. The lubricating oil composition is substantially free of tetrapropenylphenol, and is used to lubricate equipment mounted on motorcycles.

Description

lubricating oil composition

[0001] The present invention relates to a lubricating oil composition and a lubricating method using the lubricating oil composition.

[0002] In systems where the same lubricant is used for both engine lubricating oil and power transmission lubricating oil, such as in motorcycles, it is necessary for the lubricating oil to have the fuel-saving performance required for power transmission lubricating oil in addition to the wear resistance and other properties required for engine lubricating oil. In particular, to improve the fuel-saving performance of power transmission devices such as transmissions, improved clutch characteristics are required to improve power transmission rate and reduce size and weight. To meet these demands, various lubricating oil compositions have been developed. For example, Patent Document 1 discloses a lubricating oil composition for use in wet clutches of motorcycles, etc., which contains a base oil, a specified amount or less of an alkaline earth metal phenate, and a succinimide having a hydrocarbon group with a specified number of carbon atoms, but does not contain zinc alkyldithiophosphate. The metal phenate used in the lubricating oil composition described in Patent Document 1 is known as an additive that has excellent wear resistance and clutch properties.

[0003] Japanese Patent Application Laid-Open No. 2002-38180

[0004] In recent years, tetrapropenylphenol (hereinafter also referred to as "TPP"), a raw material for metal phenates, has become a concern due to its health hazards to living organisms. Therefore, safety is also an issue for lubricating oil compositions using metal phenates, such as those described in Patent Document 1, because they contain TPP, a raw material for metal phenates. Therefore, there is a demand for lubricating oil compositions that are substantially free of TPP, that are safe for living organisms, and that have excellent wear resistance and clutch characteristics and can be used to lubricate equipment installed in motorcycles.

[0005]

[0009] As a result of extensive research, the present inventors have found that a lubricating oil composition that is substantially free of tetrapropenylphenol, which comprises a base oil, a metallic detergent containing magnesium sulfonate, a boron-modified succinimide, and an organic zinc dithiophosphate, and which has a phosphorus atom content within a specified range, can solve the above-mentioned problems. Specifically, the present invention discloses the following aspects: [1] A lubricating oil composition for lubricating equipment mounted on a motorcycle, which comprises a base oil (A), a metallic detergent (B) containing magnesium sulfonate (B1), a boron-modified succinimide (C), and an organic zinc dithiophosphate (D), wherein the phosphorus atom content is 500 ppm by mass or more and 900 ppm by mass or less based on the total amount of the lubricating oil composition, and which is substantially free of tetrapropenylphenol. [2] The lubricating oil composition according to [1] above, wherein the content of component (B1) in terms of magnesium atoms is 500 ppm by mass or more, based on the total amount of the lubricating oil composition. [3] The lubricating oil composition according to [1] or [2] above, wherein the content of component (D) in terms of zinc atoms is 300 ppm by mass or more, based on the total amount of the lubricating oil composition. [4] The lubricating oil composition according to any one of [1] to [3] above, wherein the content of molybdenum atoms is less than 100 ppm by mass, based on the total amount of the lubricating oil composition. [5] The lubricating oil composition according to any one of [1] to [4] above, wherein the lubricating oil composition is substantially free of metal phenates. [6] The lubricating oil composition according to any one of [1] to [5] above, wherein the total amount of sulfur-containing compounds (S) selected from the group consisting of thiazole compounds, thiadiazole compounds, dithiocarbamate compounds, molybdenum dithiocarbamate compounds, dihydrocarbyl polysulfite compounds, and sulfurized esters, calculated as sulfur atoms, is less than 0.01 mass% based on the total amount of the lubricating oil composition. [7] The lubricating oil composition according to any one of [1] to [6] above, wherein component (B) contains calcium sulfonate (B2) together with component (B1). [8] The lubricating oil composition according to [7] above, wherein the ratio [Mg / Ca] of the content of magnesium atoms derived from component (B1) to the content of calcium atoms derived from component (B2) is 0.40 or more.[9] The lubricating oil composition according to any one of [1] to [8] above, wherein the calcium salicylate content is less than 10.0 mass%, based on the total amount of component (B).

[10] The lubricating oil composition according to any one of [1] to [9] above, wherein the boron atom content derived from component (C) is 50 to 400 ppm by mass, based on the total amount of the lubricating oil composition.

[11] The lubricating oil composition according to any one of [1] to

[10] above, wherein the sulfur atom content is 500 to 4,000 ppm by mass, based on the total amount of the lubricating oil composition.

[12] The lubricating oil composition according to any one of [1] to

[11] above, wherein the sulfated ash content is 1.20 mass% or less, based on the total amount of the lubricating oil composition.

[13] A lubricating method for lubricating equipment mounted on a motorcycle using the lubricating oil composition according to any one of [1] to

[12] above.

[14] The lubrication method according to

[13] above, wherein the equipment includes an engine and a transmission.

[0006] The lubricating oil composition of a preferred embodiment of the present invention is substantially free of TPP, and is excellent in wear resistance and clutch properties while ensuring safety to living organisms, and therefore can be suitably used for lubricating equipment mounted on motorcycles.

[0007] Regarding the numerical ranges described herein, the upper and lower limits can be arbitrarily combined. For example, when a numerical range is described as "preferably 30 to 100, more preferably 40 to 80," the ranges "30 to 80" and "40 to 100" are also included in the numerical ranges described herein. Furthermore, when a numerical range is described as "preferably 30 or more, more preferably 40 or more, and preferably 100 or less, more preferably 80 or less," the ranges "30 to 80" and "40 to 100" are also included in the numerical ranges described herein. In other words, when specifying the upper and lower limits described herein, the numerical range from the lower limit to the upper limit can be specified by appropriately selecting from the respective options and combining them arbitrarily. Furthermore, as a numerical range described herein, for example, "60 to 100" means a range of "60 or more (more than 60) and 100 or less (less than 100 or 100)." In addition, multiple combinations of the various requirements described as preferred aspects described herein can be used.

[0008] In this specification, the kinematic viscosity and viscosity index refer to values ​​measured and calculated in accordance with JIS K2283:2000. In this specification, the contents of alkali metal atoms, alkaline earth metal atoms, phosphorus atoms (P), zinc atoms (Zn), boron atoms (B), sulfur atoms (S), and molybdenum atoms (Mo) refer to values ​​measured in accordance with ASTM D4951. The content of nitrogen atoms (N) refers to a value measured in accordance with ASTM D4629.

[0009] [Configuration of Lubricating Oil Composition] The lubricating oil composition of one embodiment of the present invention is a lubricating oil composition that is substantially free of tetrapropenylphenol (TPP). Lubricating oil compositions used to lubricate motorcycle equipment are required to have performance properties such as wear resistance and clutch characteristics, and these performance requirements have been met by including a metal phenate. However, in recent years, tetrapropenylphenol (TPP), a raw material for metal phenates, has been criticized for its risk to the reproductive functions of living organisms, and there is a demand for lubricating oil compositions that are free of metal phenates and substantially free of TPP and have excellent wear resistance and clutch characteristics. The lubricating oil composition of one embodiment of the present invention is substantially free of TPP and contains a metal-based detergent (B) containing magnesium sulfonate (B1), a boron-modified succinimide (C), and an organic zinc dithiophosphate (D). By adjusting the phosphorus atom content to 500 ppm by mass or more and 900 ppm by mass or less, the lubricating oil composition improves wear resistance and clutch characteristics while ensuring safety to living organisms, thereby meeting the above requirements.

[0010] In the lubricating oil composition of one embodiment of the present invention, "substantially free of TPP" excludes cases in which additives such as metal phenates that may contain TPP are added with a specific intention, but does not exclude cases in which the TPP is inevitably contained. Furthermore, a lubricating oil composition that does not contain a metal phenate can be considered a lubricating oil composition that is substantially free of TPP. When the lubricating oil composition is substantially free of TPP, the specific TPP content may be less than 0.10 mass%, less than 0.05 mass%, less than 0.01 mass%, less than 0.001 mass%, or less than 0.0001 mass%, based on the total amount (100 mass%) of the lubricating oil composition. The TPP content can be measured by reverse-phase high-performance liquid chromatography (HPLC).

[0011] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the content of phosphorus atoms is, based on the total amount (100 mass%) of the lubricating oil composition, 500 ppm by mass or more, 510 ppm by mass or more, 520 ppm by mass or more, 530 ppm by mass or more, 540 ppm by mass or more, 550 ppm by mass or more, 560 ppm by mass or more, 570 ppm by mass or more, 580 ppm by mass or more, 590 ppm by mass or more Preferably, the concentration is 900 ppm by mass or less, 880 ppm by mass or less, 860 ppm by mass or less, 840 ppm by mass or less, 820 ppm by mass or less, 800 ppm by mass or less, 780 ppm by mass or less, 760 ppm by mass or less, 740 ppm by mass or less, 720 ppm by mass or less, 700 ppm by mass or less, 680 ppm by mass or less, 660 ppm by mass or less, 640 ppm by mass or less, or 620 ppm by mass or less.

[0012] The lubricating oil composition of one embodiment of the present invention may further contain other lubricating oil additives in addition to components (A) to (D), provided that the effects of the present invention are not impaired. In the lubricating oil composition of one embodiment of the present invention, the total content of components (A) to (D) is preferably 60 mass% or more, 65 mass% or more, 70 mass% or more, 75 mass% or more, 80 mass% or more, 85 mass% or more, or 90 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and may be 100 mass% or less, 99.9 mass% or less, 99.0 mass% or less, 98.0 mass% or less, 97.0 mass% or less, 96.0 mass% or less, or 95.0 mass% or less.

[0013] Hereinafter, each component contained in the lubricating oil composition of one embodiment of the present invention will be described in detail.

[0014] <Component (A): Base Oil> In the lubricating oil composition of one embodiment of the present invention, the base oil used as component (A) may be one or more selected from mineral oils and synthetic oils. Examples of mineral oils include atmospheric residues obtained by atmospheric distillation of crude oils such as paraffin-based crude oils, intermediate-based crude oils, and naphthene-based crude oils; distillates obtained by vacuum distillation of these atmospheric residues; and refined oils obtained by subjecting the distillates to one or more refining treatments such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrorefining.

[0015] Examples of synthetic oils include poly-α-olefins such as α-olefin homopolymers or α-olefin copolymers (for example, α-olefin copolymers having 8 to 14 carbon atoms, such as ethylene-α-olefin copolymers); isoparaffins; polyalkylene glycols; ester oils such as polyol esters, dibasic acid esters, and phosphate esters; ether oils such as polyphenyl ether; alkylbenzenes; alkylnaphthalenes; synthetic oils (GTL) obtained by isomerizing wax (GTL wax (Gas To Liquids WAX)) produced from natural gas by the Fischer-Tropsch method or the like, CTL base oils obtained by a direct liquefaction method (such as the Bergius method) in which coal is crushed and mixed with a solvent and reacted directly with hydrogen under high temperature and pressure, and coal is gasified once (coal gasification), and the resulting gas is separated and purified. Examples of CTL base oils include CTL base oils obtained by an indirect liquefaction method (such as the Fischer-Tropsch method) in which the produced gas is synthetically reacted with the separated and purified raw material to liquefy the resulting gas.

[0016] The kinematic viscosity at 40°C of the component (A) used in one embodiment of the present invention is 10 mm ２ / s or more, 15mm ２ / s or more, 20mm ２ / s or more, 25mm ２ / s or more, 30mm ２ / s or more, 35mm ２ / s or more, or 40 mm ２ / s or more, and ２ / s or less, 150mm ２ / s or less, 120mm ２ / s or less, 100mm ２ / s or less, 95mm ２ / s or less, 90mm ２ / s or less, 85mm ２ / s or less, 80mm ２ / s or less, 75mm ２ / s or less, 70mm ２ / s or less, 65mm ２ / s or less, 60mm ２ / s or less, 55mm ２ / s or less, 50mm ２ / s or less, or 45 mm ２ It is preferable to set the value to / s or less.

[0017] The kinematic viscosity at 100°C of the component (A) used in one embodiment of the present invention is 2.0 mm ２ / s or more, 2.5mm ２ / s or more, 3.0mm ２ / s or more, 3.5mm ２ / s or more, 4.0mm ２ / s or more, 4.5mm ２ / s or more, 5.0mm ２ / s or more, 5.5mm ２ / s or more, 6.0mm ２ / s or more, 6.5mm ２ / s or more, or 7.0 mm ２ / s or more, and 20.0 mm ２ / s or less, 18.0mm ２ / s or less, 16.0mm ２ / s or less, 14.0mm ２ / s or less, 12.0mm ２ / s or less, 10.0mm ２ / s or less, 9.0mm ２ / s or less, or 8.0 mm ２ It is preferable to set the value to / s or less.

[0018] The viscosity index of component (A) used in one embodiment of the present invention is preferably 70 or more, 80 or more, 90 or more, 95 or more, 100 or more, 105 or more, 110 or more, 115 or more, 120 or more, or 125 or more, and may be 200 or less, 180 or less, 170 or less, 160 or less, 150 or less, 140 or less, or 130 or less. In one embodiment of the present invention, when a mixed oil combining two or more base oils is used as component (A), the kinematic viscosity and viscosity index of the mixed oil are preferably within the above ranges. Furthermore, the weighted average calculated from the kinematic viscosity or viscosity index and content ratio of each base oil constituting the mixed oil can be considered to be the kinematic viscosity or viscosity index of the mixed oil.

[0019] In the lubricating oil composition of one embodiment of the present invention, the content of component (A) is preferably 40.0 mass% or more, 45.0 mass% or more, 50.0 mass% or more, 55.0 mass% or more, 60.0 mass% or more, 65.0 mass% or more, 70.0 mass% or more, 75.0 mass% or more, 80.0 mass% or more, or 85.0 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and may be 99.5 mass% or less, 99.0 mass% or less, 98.0 mass% or less, 97.0 mass% or less, 96.0 mass% or less, 95.0 mass% or less, 94.0 mass% or less, 93.0 mass% or less, or 92.0 mass% or less.

[0020] <Component (B): Metallic Detergent> The lubricating oil composition of one embodiment of the present invention contains a metallic detergent (B) containing a magnesium sulfonate (B1). By including magnesium sulfonate (B1) as component (B), it is possible to obtain a lubricating oil composition that improves wear resistance and clutch characteristics while ensuring biological safety. From the above viewpoints, in the lubricating oil composition of one embodiment of the present invention, the content of component (B1) in component (B) is preferably 10 mass% or more, 20 mass% or more, 25 mass% or more, 30 mass% or more, 35 mass% or more, 40 mass% or more, or 50 mass% or more relative to the total amount (100 mass%) of component (B) contained in the lubricating oil composition, and may also be 100 mass% or less, 90 mass% or less, 80 mass% or less, 75 mass% or less, 70 mass% or less, 65 mass% or less, or 60 mass% or less.

[0021] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (B) is preferably 0.20 mass% or more, 0.30 mass% or more, 0.40 mass% or more, 0.50 mass% or more, 0.60 mass% or more, 0.65 mass% or more, 0.70 mass% or more, 0.75 mass% or more, 0.80 mass% or more, 0.85 mass% or more, 0.90 mass% or more, 0.95 mass% or more, or 1.00 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and further preferably 1.20 mass% or more, It may be 1.40% by mass or more, 1.60% by mass or more, 1.80% by mass or more, 2.00% by mass or more, 2.20% by mass or more, 2.40% by mass or more, or 2.60% by mass or more, and 10.0% by mass or less, 8.00% by mass or less, 6.00% by mass or less, 5.00% by mass or less, 4.50% by mass or more. Below, 4.00 mass% or less, 3.50 mass% or less, 3.00 mass% or less, 2.80 mass% or less, 2.60 mass% or less, 2.40 mass% or less, 2.20 mass% or less, 2.00 mass% or less, 1.80 mass% or less, 1.60 mass% or less, 1.40 mass% or less, or 1.20 mass% or less.

[0022] <Component (B1): Magnesium Sulfonate> Examples of the component (B1) used in one embodiment of the present invention include magnesium sulfonates represented by the following general formula (b-1).

[0023]

[0024] In the above general formula (b-1), R is a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms. The hydrocarbon group may be a linear hydrocarbon group or a branched hydrocarbon group. Examples of hydrocarbon groups that can be selected as R include alkyl groups having 1 to 24 carbon atoms, alkenyl groups having 1 to 24 carbon atoms, cycloalkyl groups having 3 to 24 ring carbon atoms, aryl groups having 6 to 24 ring carbon atoms, alkylaryl groups having 7 to 24 carbon atoms, and arylalkyl groups having 7 to 24 carbon atoms.

[0025] Examples of component (B1) used in one embodiment of the present invention include neutral magnesium sulfonates having a base number of 0 to 20 mgKOH / g, basic magnesium sulfonates having a base number of 20 to 100 mgKOH / g, and overbased magnesium sulfonates having a base number of 100 mgKOH / g or more. Among these, from the viewpoint of obtaining a lubricating oil composition that has improved wear resistance and clutch properties while ensuring safety to living organisms, component (B1) used in one embodiment of the present invention is preferably an overbased magnesium sulfonate having a base number of 100 mgKOH / g or more.

[0026] From the viewpoint of obtaining a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the base number of component (B1) used in one embodiment of the present invention is 100 mgKOH / g or more, 120 mgKOH / g or more, 140 mgKOH / g or more, 160 mgKOH / g or more, 180 mgKOH / g or more, 200 mgKOH / g or more, 220 mgKOH / g or more, 240 mgKOH / g or more, 260 mgKOH / g or more, 270 mgKOH / g or more, 280 mgKOH / g or more, 290 mgKOH / g or more, 300 mgKOH / g or more, 310 mgKOH / g or more, 320 mgKOH / g or more, 330 mgKOH / g or more, 340 mgKOH / g or more, 350 mgKOH / g or more, 360 mgKOH / g or more, 370 mgKOH / g or more, 380 mgKOH / g or more, 390 mgKOH / g or more, 400 mgKOH / g or more, 410 mgKOH / g or more, 420 mgKOH / g or more, 430 mgKOH / g or more, 440 mgKOH / g or more, 450 mgKOH / g or more, 460 mgKOH / g or more, 470 mgKOH / g or more, 480 mgKOH / g or more, 490 mgKOH / g or more, 500 mgKOH / g or more, 510 mgKOH / g or more, 520 mgKOH / g or more, 530 mgKOH / g or more, 540 mgKOH / g or more, 550 mgKOH / g or more, 560 mgKOH / It is preferably 80 mgKOH / g or more, 300 mgKOH / g or more, 320 mgKOH / g or more, 340 mgKOH / g or more, 360 mgKOH / g or more, 380 mgKOH / g or more, or 400 mgKOH / g or more, and may also be 800 mgKOH / g or less, 700 mgKOH / g or less, 600 mgKOH / g or less, 550 mgKOH / g or less, 500 mgKOH / g or less, or 450 mgKOH / g or less.

[0027] In this specification, the base number refers to a value measured in accordance with "9. Potentiometric titration method (base number, perchloric acid method)" of JIS K2501 "Petroleum products and lubricants - Neutralization number test method."

[0028] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (B1) in terms of magnesium atom is, based on the total amount (100 mass%) of the lubricating oil composition, 240 ppm by mass or more, 260 ppm by mass or more, 280 ppm by mass or more, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, It is preferable that the concentration is 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more, 510 ppm by mass or more, 520 ppm by mass or more, 530 ppm by mass or more, 540 ppm by mass or more, or 550 ppm by mass or more, and further 560 ppm by mass or more, 580 ppm by mass or more, 600 ppm by mass or more, 700 ppm by mass or more, 800 ppm by mass or more. The concentration may be 900 mass ppm or more, 1000 mass ppm or more, 1100 mass ppm or more, 1200 mass ppm or more, 1300 mass ppm or more, 1400 mass ppm or more, 1500 mass ppm or more, 1600 mass ppm or more, or 1700 mass ppm or more, and may be 3000 mass ppm or less, 2500 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1700 mass ppm or less, 1600 mass ppm or less, or 1700 mass ppm or more. Quantity ppm or less, 1500 mass ppm or less, 1400 mass ppm or less, 1300 mass ppm or less, 1200 mass ppm or less, 1100 mass ppm or less, 1000 mass ppm or less, 950 mass ppm or less, 900 mass ppm Hereinafter, it may be 850 mass ppm or less, 800 mass ppm or less, 750 mass ppm or less, 700 mass ppm or less, 650 mass ppm or less, 600 mass ppm or less, 580 mass ppm or less, or 560 mass ppm or less.

[0029] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (B1) is preferably 0.10 mass% or more, 0.15 mass% or more, 0.20 mass% or more, 0.25 mass% or more, 0.30 mass% or more, 0.35 mass% or more, 0.40 mass% or more, 0.45 mass% or more, 0.50 mass% or more, or 0.55 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and further preferably 0.60 mass% or more, 0.70 mass% or more, 0.80 mass% or more, 0.90 mass% or more, or % or more, 1.00% by mass or more, 1.10% by mass or more, 1.20% by mass or more, 1.30% by mass or more, 1.40% by mass or more, 1.50% by mass or more, or 1.60% by mass or more, and 5.00% by mass or less, 4.50% by mass or less, 4.00% by mass or less, 3.50% by mass or less, 3 .00 mass% or less, 2.50 mass% or less, 2.00 mass% or less, 1.80 mass% or less, 1.60 mass% or less, 1.40 mass% or less, 1.20 mass% or less, 1.00 mass% or less, 0.90 mass% or less, 0.80 mass% or less, 0.70 mass% or less, or 0.60 mass% or less.

[0030] <Component (B2): Calcium Sulfonate> In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, component (B) preferably contains calcium sulfonate (B2) together with component (B1). Examples of component (B2) used in one embodiment of the present invention include calcium sulfonates represented by the following general formula (b-2):

[0031]

[0032] In the above general formula (b-2), R is a hydrogen atom or a hydrocarbon group having 1 to 24 carbon atoms. The hydrocarbon group may be a linear hydrocarbon group or a branched hydrocarbon group. Examples of hydrocarbon groups that can be selected as R include alkyl groups having 1 to 24 carbon atoms, alkenyl groups having 1 to 24 carbon atoms, cycloalkyl groups having 3 to 24 ring carbon atoms, aryl groups having 6 to 24 ring carbon atoms, alkylaryl groups having 7 to 24 carbon atoms, and arylalkyl groups having 7 to 24 carbon atoms.

[0033] Examples of component (B2) used in one embodiment of the present invention include neutral calcium sulfonates with a base number of 0 to 20 mgKOH / g, basic calcium sulfonates with a base number of 20 to 100 mgKOH / g, and overbased calcium sulfonates with a base number of 100 mgKOH / g or greater. Among these, from the perspective of providing a lubricating oil composition that has improved wear resistance and clutch properties while ensuring safety to living organisms, component (B2) used in one embodiment of the present invention is preferably an overbased calcium sulfonate with a base number of 100 mgKOH / g or greater.

[0034] From the viewpoint of obtaining a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the base number of component (B2) used in one embodiment of the present invention is preferably 100 mgKOH / g or more, 120 mgKOH / g or more, 140 mgKOH / g or more, 160 mgKOH / g or more, 180 mgKOH / g or more, 200 mgKOH / g or more, 220 mgKOH / g or more, 240 mgKOH / g or more, 260 mgKOH / g or more, 280 mgKOH / g or more, or 300 mgKOH / g or more, and may also be 600 mgKOH / g or less, 550 mgKOH / g or less, 500 mgKOH / g or less, 450 mgKOH / g or less, 400 mgKOH / g or less, or 350 mgKOH / g or less.

[0035] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (B2) in terms of calcium atoms is preferably 240 ppm by mass or more, 260 ppm by mass or more, 280 ppm by mass or more, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more, 520 ppm by mass or more, 540 ppm by mass or more, 560 ppm by mass or more, or 580 ppm by mass or more, based on the total amount (100 mass%) of the lubricating oil composition. The concentration may be 3000 mass ppm or more, 700 mass ppm or more, 800 mass ppm or more, 900 mass ppm or more, or 1000 mass ppm or more, and may be 3000 mass ppm or less, 2500 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1700 mass ppm or less, 1600 mass ppm or less, 1500 mass ppm or less, 14 ... 00 mass ppm or less, 1300 mass ppm or less, 1200 mass ppm or less, 1100 mass ppm or less, 1000 mass ppm or less, 950 mass ppm or less, 900 mass ppm or less, 85 It may be 0 mass ppm or less, 800 mass ppm or less, 750 mass ppm or less, 700 mass ppm or less, 650 mass ppm or less, 600 mass ppm or less, or 580 mass ppm or less.

[0036] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (B2) is preferably 0.10 mass% or more, 0.15 mass% or more, 0.20 mass% or more, 0.25 mass% or more, 0.30 mass% or more, 0.35 mass% or more, 0.40 mass% or more, 0.45 mass% or more, or 0.50 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and further preferably 0.55 mass% or more, 0.60 mass% or more, % or more, 0.70 mass% or more, 0.80 mass% or more, or 0.90 mass% or more, and 5.00 mass% or less, 4.50 mass% or less, 4.00 mass% or less, 3.50 mass% or less, 3.00 mass% or less, 2.50 mass% or less, 2.00 mass% % or less, 1.80 mass% or less, 1.60 mass% or less, 1.40 mass% or less, 1.20 mass% or less, 1.00 mass% or less, 0.90 mass% or less, 0.80 mass% or less, 0.70 mass% or less, 0.60 mass% or less, or 0.55 mass% or less.

[0037] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the ratio [Mg / Ca] of the content of magnesium atoms derived from component (B1) to the content of calcium atoms derived from component (B2) is preferably 0.40 or more, 0.45 or more, 0.50 or more, 0.55 or more, 0.60 or more, 0.65 or more, 0.70 or more, 0.75 or more, 0.80 or more, 0.85 or more, 0.90 or more, or 0.95 or more, and further preferably 1.00 or more, 1.10 or more, 1.20 or more, 1.30 or more, 1.40 or more, 1.50 or more. It may be 1.60 or more, 1.70 or more, 1.80 or more, 1.90 or more, 2.00 or more, 2.10 or more, 2.20 or more, 2.30 or more, 2.40 or more, or 2.50 or more, and is preferably 5.00 or less, 4.80 or less, 4.60 or less, 4.40 or less, 4.20 or less, 4.00 or less, 3.80 or less, 3.60 or less, 3.40 or less, 3.20 or less, 3.00 or less, 2.80 or less, or 2.60 or less, and may further be 2.40 or less, 2.20 or less, 2.00 or less, 1.80 or less, 1.60 or less, 1.50 or less, 1.40 or less, 1.30 or less, 1.20 or less, or 1.10 or less.

[0038] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the total content of magnesium atoms derived from component (B1) and calcium atoms derived from component (B2) is, based on the total amount (100 mass%) of the lubricating oil composition, 500 ppm by mass or more, 520 ppm by mass or more, 540 ppm by mass or more, 560 ppm by mass or more, 580 ppm by mass or more, 600 ppm by mass or more, 620 ppm by mass or more, 640 ppm by mass or more, 660 ppm by mass or more, 680 ppm by mass or more, 700 ppm by mass or more, 750 ppm by mass or more, 800 ppm by mass or more, 900 ppm by mass or more, 1000 ppm by mass or more, or 1100 ppm by mass or more. It is preferable that the concentration is 1200 mass ppm or more, 1400 mass ppm or more, 1600 mass ppm or more, 1800 mass ppm or more, 2000 mass ppm or more, 2200 mass ppm or more, or 2400 mass ppm or more, and may also be 4000 mass ppm or less, 3500 mass ppm or less, 3000 mass ppm or less, 2800 mass ppm or less. pm or less, 2600 mass ppm or less, 2400 mass ppm or less, 2200 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1 It may be 700 mass ppm or less, 1600 mass ppm or less, 1500 mass ppm or less, 1400 mass ppm or less, 1300 mass ppm or less, or 1200 mass ppm or less.

[0039] <Metallic Detergent Other Than Components (B1) and (B2)> The lubricating oil composition of one embodiment of the present invention may contain, as component (B), a metallic detergent that does not fall under components (B1) and (B2), as long as the effects of the present invention are not impaired.

[0040] However, from the viewpoint of providing a lubricating oil composition that is substantially free of TPP and ensures biological safety, it is preferable that the lubricating oil composition of one embodiment of the present invention is substantially free of metal phenates. Note that "substantially free of metal phenates" excludes embodiments in which metal phenates are added with a specific intention, but does not exclude embodiments in which metal phenates are unavoidably contained. In the embodiment in which "substantially free of metal phenates" is used, the specific metal phenate content may be less than 0.10 mass%, less than 0.01 mass%, less than 0.001 mass%, or less than 0.0001 mass%, based on the total amount (100 mass%) of the lubricating oil composition.

[0041] In the lubricating oil composition of one embodiment of the present invention, examples of metallic detergents that can be used as component (B) and that do not fall under components (B1) and (B2) include metal sulfonates such as sodium sulfonate; metal salicylates such as calcium salicylate, magnesium salicylate, and sodium salicylate; etc. These metallic detergents may be used alone or in combination of two or more.

[0042] In the lubricating oil composition of one embodiment of the present invention, the lower the calcium salicylate content, the more preferable it is, from the viewpoint of obtaining a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms. From this viewpoint, the specific calcium salicylate content is preferably less than 10.0 mass%, less than 8.0 mass%, less than 6.0 mass%, less than 4.0 mass%, less than 3.0 mass%, less than 2.0 mass%, less than 1.0 mass%, less than 0.10 mass%, less than 0.01 mass%, or less than 0.001 mass%, relative to the total amount (100 mass%) of component (B) contained in the lubricating oil composition.

[0043] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of obtaining a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring biological safety, the lower the content of metal salicylate, the more preferable.From the above viewpoint, the specific content of metal salicylate is preferably less than 10.0 mass%, less than 8.0 mass%, less than 6.0 mass%, less than 4.0 mass%, less than 3.0 mass%, less than 2.0 mass%, less than 1.0 mass%, less than 0.10 mass%, less than 0.01 mass%, or less than 0.001 mass%, relative to the total amount (100 mass%) of component (B) contained in the lubricating oil composition.

[0044] <Component (C): Boron-modified succinimide> The lubricating oil composition of one embodiment of the present invention contains a boron-modified succinimide as component (C). By containing component (C), it is possible to obtain a lubricating oil composition with improved wear resistance and clutch characteristics. In one embodiment of the present invention, component (C) may be used alone or in combination of two or more types.

[0045] Component (C) used in one aspect of the present invention is preferably at least one selected from boron-modified alkenyl succinic acid bisimides represented by the following general formula (c-1) and boron-modified alkenyl succinic acid monoimides represented by the following general formula (c-2):

[0046] In the above general formulas (c-1) and (c-2), R Ｃ１ , R Ｃ２ and R Ｃ３ are each independently an alkenyl group having a mass average molecular weight (Mw) of 500 to 3000 (preferably 900 to 2500). In this specification, the mass average molecular weight (Mw) and number average molecular weight (Mn) are values ​​calculated in terms of standard polystyrene measured by gel permeation chromatography (GPC). Ｃ１ , R Ｃ２ and R Ｃ３ Examples of the alkenyl group that can be selected as A include a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer, and the like. Among these, a polybutenyl group or a polyisobutenyl group is preferred. Ｃ１ , AＣ２ and A Ｃ３ are each independently an alkylene group having 2 to 5 carbon atoms. z1 is an integer of 0 to 10, preferably an integer of 1 to 4, and more preferably 2 or 3. z2 is an integer of 1 to 10, preferably an integer of 2 to 5, and more preferably 3 or 4.

[0047] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the content ratio of boron atoms to nitrogen atoms constituting component (C) [B / N], in mass ratio, is preferably 0.30 or more, 0.40 or more, 0.50 or more, 0.60 or more, 0.65 or more, 0.70 or more, 0.75 or more, 0.80 or more, 0.85 or more, 0.90 or more, 0.95 or more, or 1.00 or more, and is also preferably less than 2.00, 1.90 or less, 1.80 or less, 1.70 or less, 1.60 or less, 1.50 or less, 1.40 or less, 1.30 or less, 1.20 or less, or 1.10 or less.

[0048] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of boron atoms derived from component (C) is, based on the total amount of the lubricating oil composition, 50 ppm by mass or more, 70 ppm by mass or more, 90 ppm by mass or more, 100 ppm by mass or more, 110 ppm by mass or more, 120 ppm by mass or more, 130 ppm by mass or more, 140 ppm by mass or more, 160 ppm by mass or more, 180 ppm by mass or more, 200 ppm by mass or more, 220 ppm by mass or more, 240 ppm by mass or more It is preferable to set the concentration to 400 ppm by mass or less, 380 ppm by mass or less, 360 ppm by mass or less, 340 ppm by mass or less, 330 ppm by mass or less, 320 ppm by mass or less, 310 ppm by mass or less, 300 ppm by mass or less, 290 ppm by mass or less, 280 ppm by mass or less, or 270 ppm by mass or less, and further, it may be set to 250 ppm by mass or less, 220 ppm by mass or less, 200 ppm by mass or less, 180 ppm by mass or less, 160 ppm by mass or less, or 140 ppm by mass or less.

[0049] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance and clutch characteristics while ensuring safety to living organisms, the content of component (C) is, based on the total amount (100 mass%) of the lubricating oil composition, 0.10 mass% or more, 0.20 mass% or more, 0.40 mass% or more, 0.60 mass% or more, 0.70 mass% or more, 0.80 mass% or more, 0.90 mass% or more, 1.00 mass% or more, 1.10 mass% or more, 1.20 mass% or more, 1.40 mass% or more, 1.60 mass% or more, 1.80 mass% or more, 2.0 mass% or more, 3.0 mass% or more, 4.0 mass% or more, 5.0 mass% or more, 6.0 mass% or more, 7.0 mass% or more, 8.0 mass% or more, 9.0 mass% or more, 10.0 mass% or more, 11.0 mass% or more, 12.0 mass% or more, 13.0 mass% or more, 14.0 mass% or more, 15.0 mass% or more, 16.0 mass% or more, 17.0 mass% or more, 18.0 mass% or more, 19.0 mass% or more, 20.0 mass% or more, 21.0 mass% or more, 22.0 mass% or more, 23.0 mass% or more, 24.0 mass% or more, 25.0 mass% or more, 26.0 mass% or more, 27.0 mass% or more, 28.0 mass% or more, 29.0 mass% or more, 30.0 mass% or more, 31.0 mass% or more, 32.0 mass% or more, 33.0 mass It is preferable to set it to 0% by mass or more, and it may further be 2.50% by mass or more, 3.00% by mass or more, 3.50% by mass or more, 4.00% by mass or more, 4.50% by mass or more, or 5.00% by mass or more, and it is also preferable to set it to 8.00% by mass or less, 7.00% by mass or less, 6.00% by mass or less, or 5.50% by mass or less, and it may further be 5.00% by mass or less, 4.50% by mass or less, 4.00% by mass or less, 3.50% by mass or less, 3.00% by mass or less, 2.50% by mass or less, 2.00% by mass or less, or 1.50% by mass or less.

[0050] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that ensures biological safety while particularly improving clutch properties, the ratio [Mg / B] of the content of magnesium atoms derived from component (B1) to the content of boron atoms derived from component (C) is 0.50 or more, 1.00 or more, 1.20 or more, 1.40 or more, 1.60 or more, 1.70 or more, 1.80 or more, 2.00 or more, 2.10 or more, 2.20 or more, 2.40 or more, 2.60 or more, 2.80 or more, 3.00 or more, 3.20 or more, 3.40 or more, 3.60 or more, 3.80 or more, 4.00 or more, 4.10 or more, or 4.2 It is preferable that the β-dispersion index is 0 or more, and may further be 4.30 or more, 4.50 or more, 5.00 or more, 6.00 or more, 7.00 or more, 8.00 or more, 9.00 or more, 10.0 or more, or 11.0 or more, and is also preferably 30.0 or less, 25.0 or less, 20.0 or less, 18.0 or less, 16.0 or less, 14.0 or less, 12.0 or less, 10.0 or less, 9.00 or less, 8.00 or less, 7.00 or less, 6.00 or less, 5.00 or less, 4.50 or less, 4.00 or less, 3.50 or less, 3.00 or less, 2.90 or less, 2.80 or less, 2.70 or less, 2.60 or less, 2.40 or less, or 2.20 or less.

[0051] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that is improved in particular in anti-wear properties while ensuring safety to living organisms, the ratio of the content of zinc atoms derived from component (D) to the content of boron atoms derived from component (C) [Zn / B] is 1.00 or more, 1.20 or more, 1.40 or more, 1.60 or more, 1.80 or more, 2.00 or more, 2.10 or more, 2.20 or more, 2.40 or more, 2.60 or more, 2.80 or more, 3.00 or more, 3.20 or more, 3.40 or more, 3.60 or more. It is preferably 3.80 or more, 4.00 or more, 4.10 or more, or 4.20 or more, and is also preferably 7.00 or less, 6.50 or less, 6.00 or less, 5.50 or less, 5.00 or less, 4.80 or less, 4.60 or less, 4.50 or less, 4.40 or less, or 4.30 or less, and may further be 4.20 or less, 4.00 or less, 3.80 or less, 3.60 or less, 3.40 or less, 3.20 or less, 3.00 or less, 2.80 or less, 2.60 or less, 2.40 or less, or 2.20 or less.

[0052] <Non-boron-modified succinimide> The lubricating oil composition of one embodiment of the present invention may further contain a non-boron-modified succinimide, as long as the effects of the present invention are not impaired. Examples of the non-boron-modified succinimide used in one embodiment of the present invention include alkenyl succinic acid bisimide represented by general formula (c-1) above before boron modification and alkenyl succinic acid monoimide represented by general formula (c-2) below before boron modification. The non-boron-modified succinimide may be used alone or in combination of two or more types.

[0053] In the lubricating oil composition of one embodiment of the present invention, the content of the non-boron-modified succinimide may be 0.10 mass % or more, 0.50 mass % or more, or 1.0 mass % or more, based on the total amount (100 mass %) of the lubricating oil composition, and may be 10.0 mass % or less, 8.0 mass % or less, 6.0 mass % or less, 5.0 mass % or less, 4.0 mass % or less, or 3.0 mass % or less.

[0054] <Component (D): Zinc Organic Dithiophosphate> The lubricating oil composition of one embodiment of the present invention contains zinc organic dithiophosphate (ZnDTP) as component (D). By containing component (D), it is possible to obtain a lubricating oil composition that is improved in particular in wear resistance while ensuring safety to living organisms. In one embodiment of the present invention, component (D) may be used alone or in combination of two or more types.

[0055] Component (D) used in one embodiment of the present invention includes a compound represented by the following general formula (d-1).

[0056] In the above formula (d-1), R Ｄ１ ~R Ｄ４ are each independently a hydrocarbon group, and may be the same or different from each other. Ｄ１ ~R Ｄ４ The number of carbon atoms in the hydrocarbon group that can be selected as above is preferably 1 to 20, more preferably 1 to 16, even more preferably 3 to 12, and even more preferably 3 to 10.

[0057] R Ｄ１ ~R Ｄ４Examples of the hydrocarbon group that can be selected as the above include straight-chain or branched alkyl groups such as methyl, ethyl, propyl (n-propyl, isopropyl, etc.), butyl (n-butyl, isobutyl, s-butyl, t-butyl, etc.), pentyl (n-pentyl, i-pentyl, neopentyl), hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, and octadecyl; vinyl, propenyl, isopropenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, and undecenyl. linear or branched alkenyl groups such as a cyclohexyl group, a dodecenyl group, a tridecenyl group, a tetradecenyl group, or a pentadecenyl group; cycloalkyl groups such as a cyclohexyl group, a dimethylcyclohexyl group, an ethylcyclohexyl group, a methylcyclohexylmethyl group, a cyclohexylethyl group, a propylcyclohexyl group, a butylcyclohexyl group, or a heptylcyclohexyl group; aryl groups such as a phenyl group, a naphthyl group, an anthracenyl group, a biphenyl group, or a terphenyl group; alkylaryl groups such as a tolyl group, a dimethylphenyl group, a butylphenyl group, a nonylphenyl group, a methylbenzyl group, or a dimethylnaphthyl group; and arylalkyl groups such as a phenylmethyl group, a phenylethyl group, or a diphenylmethyl group. Ｄ１ ~R Ｄ４ The alkyl and alkenyl groups that can be selected as R and the alkyl and alkenyl groups that can be bonded as substituents to the cycloalkyl and aryl groups may be linear or branched. Ｄ１ ~R Ｄ４ The hydrocarbon group that can be selected as is preferably an alkyl group, more preferably a primary or secondary alkyl group, and even more preferably a secondary alkyl group.

[0058] From the viewpoint of providing a lubricating oil composition that is improved in wear resistance, while ensuring safety to living organisms, component (D) used in one embodiment of the present invention preferably contains one or more selected from primary zinc dialkylthiophosphates and secondary zinc dialkylthiophosphates, and more preferably contains secondary zinc dialkylthiophosphates.

[0059] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance while ensuring safety to living organisms, the content of component (D) in terms of zinc atom is, based on the total amount (100 mass%) of the lubricating oil composition, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more, 600 ppm by mass or more, 700 ppm by mass or more, 800 ppm by mass or more, 900 ppm by mass or more, 1000 ppm by mass or more, 1100 ppm by mass or more, 1200 ppm by mass or more, 1300 ppm by mass or more, 1400 ppm by mass or more, 1500 ppm by mass or more, 1600 ppm by mass or more, 1700 ppm by mass or more, 1800 ppm by mass or more, 1900 ppm by mass or more, 2000 ppm by mass or more, 2100 ppm by mass or more, 2200 ppm by mass or more, 2300 ppm by mass or more, 2400 ppm by mass or more, 2500 ppm by mass or more, 2600 ppm by mass or more, 2700 ppm by mass or more, 2800 ppm by mass or more, 2900 ppm by mass or more, 3000 ppm by mass or more, 3100 ppm by mass or more, 3200 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 40 It is preferable that the concentration is 510 ppm by mass or more, 520 ppm by mass or more, 530 ppm by mass or more, 540 ppm by mass or more, or 550 ppm by mass or more, and is 2000 ppm by mass or less, 1500 ppm by mass or less, 1200 ppm by mass or less, 1000 ppm by mass or less, 900 ppm by mass or less, 800 ppm by mass or less, 750 ppm by mass or less, 700 ppm by mass or less, 650 ppm by mass or less, 600 ppm by mass or less, or 580 ppm by mass or less.

[0060] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance while ensuring safety to living organisms, the content of component (D) is preferably 0.10 mass% or more, 0.20 mass% or more, 0.30 mass% or more, 0.40 mass% or more, 0.45 mass% or more, 0.50 mass% or more, 0.55 mass% or more, 0.60 mass% or more, 0.65 mass% or more, 0.70 mass% or more, or 0.75 mass% or more, based on the total amount (100 mass%) of the lubricating oil composition, and is preferably 7.0 mass% or less, 6.0 mass% or less, 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% or less, 2.0 mass% or less, 1.5 mass% or less, 1.2 mass% or less, 1.0 mass% or less, or 0.90 mass% or less.

[0061] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that has a well-balanced improvement in wear resistance and clutch characteristics while ensuring safety to living organisms, the ratio [Zn / Mg] of the content of zinc atoms derived from component (D) to the content of magnesium atoms derived from component (B1) is 0.05 or more, 0.10 or more, 0.15 or more, 0.20 or more, 0.25 or more, 0.30 or more, 0.35 or more, 0.40 or more, 0.45 or more, 0.50 or more, 0.55 or more. , 0.60 or more, 0.65 or more, 0.70 or more, 0.75 or more, 0.80 or more, 0.85 or more, 0.90 or more, 0.95 or more, or 1.00 or more, and may also be 5.00 or less, 4.50 or less, 4.00 or less, 3.50 or less, 3.00 or less, 2.80 or less, 2.60 or less, 2.40 or less, 2.20 or less, 2.00 or less, 1.80 or less, 1.60 or less, 1.50 or less, 1.40 or less, 1.30 or less, 1.20 or less, or 1.10 or less.

[0062] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that has a well-balanced improvement in wear resistance and clutch characteristics while ensuring safety to living organisms, the ratio of the content of zinc atoms derived from component (D) to the total content of magnesium atoms derived from component (B1) and calcium atoms derived from component (B2), [Zn / (Mg+Ca)], is 0.10 or more, 0.12 or more, 0.14 or more, 0.16 or more, 0.18 or more, 0.20 or more, 0.22 or more, 0.24 or more, 0.26 or more, 0.27 or more, 0.28 or more, 0.29 or more, 0.30 or more, 0.31 or more, 0.32 or more, 0.33 or more, 0.34 or more, 0.35 or more, 0.36 or more, 0.37 or more, 0.38 or more, 0.39 or more, 0.40 or more, 0.41 or more, 0.42 or more, 0.43 or more, 0.44 or more, 0.45 or more, 0.46 or more, 0.47 or more, 0.48 or more, 0.49 or more, 0.50 or more, 0.51 or more, 0.52 or more, 0.53 or more, 0.54 or more, 0.55 or more, 0.56 or more, 0.57 or more, 0.58 or more, 0.59 or more, 0.60 or more, 0.61 or more, 0.62 or more, 0.63 or more, 0.64 or more, 0.65 or more, 0.66 or more, 0.67 or more, 0.68 or more, 0.69 It is preferably 0.26 or more, 0.28 or more, 0.30 or more, 0.32 or more, 0.34 or more, 0.36 or more, 0.38 or more, 0.40 or more, 0.42 or more, 0.44 or more, 0.46 or more, or 0.48 or more, and is preferably 10.0 or less, 9.00 or less, 8.00 or less, 7.00 or less, 6.50 or less, 6.00 or less, 5.50 or less, or 5.00 or less, and may further be 4.50 or less, 4.00 or less, 3.50 or less, 3.00 or less, or 2.50 or less.

[0063] <Lubricating Oil Additives> The lubricating oil composition of one embodiment of the present invention may further contain lubricating oil additives other than components (B) to (D), as necessary, to the extent that the effects of the present invention are not impaired. Examples of such lubricating oil additives include pour point depressants, viscosity index improvers, antioxidants, friction modifiers, antiwear agents, extreme pressure agents, oiliness agents, metal deactivators, corrosion inhibitors, rust inhibitors, and antifoaming agents. These lubricating oil additives may be used alone or in combination of two or more.

[0064] The content of each of the above lubricating oil additives can be adjusted as appropriate within a range that does not impair the effects of the present invention, but is typically 0.001 to 15 mass %, preferably 0.005 to 10 mass %, and more preferably 0.01 to 5 mass %, for each additive independently, based on the total amount (100 mass %) of the lubricating oil composition.

[0065] Furthermore, the lubricating oil composition of one embodiment of the present invention may have limited contents of the lubricating oil additives, and the content of each of the lubricating oil additives may be less than 5.0 mass%, less than 2.0 mass%, less than 1.0 mass%, less than 0.1 mass%, less than 0.01 mass%, less than 0.001 mass%, less than 0.0001 mass%, or less than 0.00001 mass%, based on the total amount (100 mass%) of the lubricating oil composition.

[0066] [Pour Point Depressant] The lubricating oil composition of one embodiment of the present invention may further contain a pour point depressant. The pour point depressants may be used alone or in combination of two or more. Examples of pour point depressants used in one embodiment of the present invention include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffins and naphthalene, condensates of chlorinated paraffins and phenols, polymethacrylates, polyalkylstyrenes, etc. The weight average molecular weight (Mw) of the pour point depressant used in one embodiment of the present invention may be 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, 20,000 or more, 25,000 or more, 30,000 or more, 35,000 or more, 40,000 or more, 45,000 or more, 50,000 or more, 55,000 or more, or 60,000 or more; and may be 150,000 or less, 120,000 or less, 100,000 or less, 90,000 or less, 80,000 or less, 60,000 or less, 50,000 or less, 40,000 or less, 30,000 or less, or 20,000 or less.

[0067] [Viscosity Index Improver] The lubricating oil composition of one embodiment of the present invention may further contain a viscosity index improver. The viscosity index improver may be used alone or in combination of two or more types. Examples of viscosity index improvers used in one embodiment of the present invention include polymers such as non-dispersant polymethacrylate, dispersant polymethacrylate, olefin copolymers (e.g., ethylene-propylene copolymers, etc.), dispersant olefin copolymers, and styrene copolymers (e.g., styrene-diene copolymers, styrene-isoprene copolymers, etc.). The viscosity index improver used in one embodiment of the present invention may also be a star polymer, a comb polymer, or the like.

[0068] The viscosity index improver used in one embodiment of the present invention may have a mass average molecular weight (Mw) of 5,000 or more, 10,000 or more, 20,000 or more, 50,000 or more, 100,000 or more, 200,000 or more, 300,000 or more, 400,000 or more, 500,000 or more, or 600,000 or more, or may have a molecular weight distribution (Mw / Mn) of 1,500,000 or less, 1,200,000 or less, 1,000,000 or less, 800,000 or less, 700,000 or less, or 650,000 or less. The viscosity index improver used in one embodiment of the present invention may also have a molecular weight distribution (Mw / Mn) of 8.0 or less, 7.0 or less, 6.0 or less, 5.0 or less, 4.0 or less, 3.0 or less, or 1.9 or less, and is typically 1.01 or more.

[0069] [Antioxidant] The lubricating oil composition of one embodiment of the present invention may further contain an antioxidant. The antioxidant may be used alone or in combination of two or more types. Examples of the antioxidant used in one embodiment of the present invention include amine-based antioxidants such as alkylated diphenylamine, phenylnaphthylamine, and alkylated phenylnaphthylamine; and phenol-based antioxidants such as 2,6-di-t-butylphenol, 4,4'-methylenebis(2,6-di-t-butylphenol), isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.

[0070] [Friction modifiers and anti-wear agents] The lubricating oil composition of one embodiment of the present invention may further contain a friction modifier or anti-wear agent. The friction modifiers or anti-wear agents may be used alone or in combination of two or more. Examples of the friction modifiers and anti-wear agents used in one embodiment of the present invention include sulfur-based compounds such as sulfurized olefins, dialkyl polysulfides, diaryl alkyl polysulfides, and diaryl polysulfides; phosphorus-based compounds such as phosphate esters, thiophosphate esters, phosphites, alkyl hydrogen phosphites, phosphate ester amine salts, and phosphites ester amine salts; ashless friction modifiers such as fatty acid esters, fatty acid amides, fatty acids, aliphatic alcohols, aliphatic ethers, urea-based compounds, and hydrazide-based compounds.

[0071] [Extreme Pressure Agent] The lubricating oil composition of one embodiment of the present invention may further contain an extreme pressure agent. The extreme pressure agent may be used alone or in combination of two or more. Examples of the extreme pressure agent used in one embodiment of the present invention include sulfur-based compounds such as sulfurized olefins, dialkyl polysulfides, diaryl alkyl polysulfides, and diaryl polysulfides, and phosphorus-based compounds such as phosphate esters, thiophosphate esters, phosphite esters, alkyl hydrogen phosphites, phosphate ester amine salts, and phosphite ester amine salts.

[0072] [Oilability Agent] The lubricating oil composition of one embodiment of the present invention may further contain an oiliness agent. The oiliness agent may be used alone or in combination of two or more types. Examples of oiliness agents used in one embodiment of the present invention include saturated and unsaturated aliphatic monocarboxylic acids such as stearic acid and oleic acid, polymerized fatty acids such as dimer acid and hydrogenated dimer acid, hydroxy fatty acids such as ricinoleic acid and 12-hydroxystearic acid, saturated and unsaturated aliphatic monoalcohols such as lauryl alcohol and oleyl alcohol, saturated and unsaturated aliphatic monoamines such as stearylamine and oleylamine, and saturated and unsaturated aliphatic monocarboxylic acid amides such as lauric acid amide and oleic acid amide.

[0073] [Metal Deactivator] The lubricating oil composition of one embodiment of the present invention may further contain a metal deactivator. The metal deactivators may be used alone or in combination of two or more. Examples of the metal deactivator used in one embodiment of the present invention include benzotriazole-based compounds, tolyltriazole-based compounds, imidazole-based compounds, thiadiazole-based compounds, and pyrimidine-based compounds.

[0074] [Corrosion inhibitor] The lubricating oil composition of one embodiment of the present invention may further contain a corrosion inhibitor. The corrosion inhibitor may be used alone or in combination of two or more. Examples of the corrosion inhibitor used in one embodiment of the present invention include amine compounds, alkanolamine compounds, amide compounds, and carboxylic acid compounds.

[0075] [Rust inhibitor] The lubricating oil composition of one embodiment of the present invention may further contain a rust inhibitor. The rust inhibitor may be used alone or in combination of two or more. Examples of the rust inhibitor used in one embodiment of the present invention include fatty acids, alkenyl succinic acid half esters, fatty acid soaps, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, and alkyl polyoxyethylene ethers.

[0076] [Antifoaming Agent] The lubricating oil composition of one embodiment of the present invention may further contain an antifoaming agent. The antifoaming agent may be used alone or in combination of two or more. Examples of the antifoaming agent used in one embodiment of the present invention include alkylsilicone-based antifoaming agents, fluorosilicone-based antifoaming agents, and fluoroalkyl ether-based antifoaming agents.

[0077] In the lubricating oil composition of one embodiment of the present invention, the content of the sulfur-containing compound (S) selected from the group consisting of thiazole compounds, thiadiazole compounds, dithiocarbamate compounds, molybdenum dithiocarbamate compounds, dihydrocarbyl polysulfite compounds, and sulfurized esters may be limited. The total content of the sulfur-containing compound (S) in the lubricating oil composition of this embodiment, calculated as sulfur atoms, is preferably less than 0.01 mass%, less than 0.001 mass%, less than 1.0 mass ppm, less than 0.1 mass ppm, less than 0.01 mass ppm, or less than 0.001 mass ppm, based on the total amount of the lubricating oil composition.

[0078] [Method for producing lubricating oil composition] There are no particular limitations on the method for producing the lubricating oil composition of one embodiment of the present invention, but from the viewpoint of productivity, it is preferred that the method comprises a step of blending the above-mentioned components (B) to (D) and, as necessary, other lubricating oil additives into the base oil (A).

[0079] [Properties of Lubricating Oil Composition] The kinematic viscosity of the lubricating oil composition of one embodiment of the present invention at 40°C is ２ / s or more, 15mm ２ / s or more, 20mm ２ / s or more, 25mm ２ / s or more, 30mm ２ / s or more, 35mm ２ / s or more, 40mm ２ / s or more, 42 mm ２ / s or more, 43mm ２ / s or more, 45mm ２ / s or more, 50mm ２ / s or more, 55mm ２ / s or more, 60mm ２ / s or more, or 65 mm ２ / s or more, and ２ / s or less, 150mm ２ / s or less, 120mm ２ / s or less, 110mm ２ / s or less, 105mm ２ / s or less, 100mm ２ / s or less, 95mm ２ / s or less, 90mm ２ / s or less, 85mm ２ / s or less, 80mm ２ / s or less, 75mm ２ / s or less, or 70 mm ２ It is preferable to set the value to / s or less.

[0080] The lubricating oil composition of one embodiment of the present invention has a kinematic viscosity at 100°C of 2.0 mm ２ / s or more, 2.5mm ２ / s or more, 3.0mm ２ / s or more, 3.5mm ２ / s or more, 4.0mm ２ / s or more, 4.5mm ２ / s or more, 5.0mm ２ / s or more, 5.5mm ２ / s or more, 6.0mm ２ / s or more, 6.5mm ２ / s or more, 7.0mm ２ / s or more, 7.5mm ２ / s or more, 8.0mm ２ / s or more, 8.5mm ２ / s or more, 9.0mm ２ / s or more, 9.2mm ２ / s or more, 9.3mm ２ / s or more, 9.5mm ２ / s or more, 10.0mm ２ / s or more, or 10.5 mm ２ / s or more, and 25.0 mm ２ / s or less, 22.0mm ２ / s or less, 20.0mm ２ / s or less, 18.0mm ２ / s or less, 17.0mm ２ / s or less, 16.5mm ２ / s or less, 16.0mm ２ / s or less, 15.0mm ２ / s or less, 14.0mm ２ / s or less, 13.0mm ２ / s or less, or 12.0 mm ２ It is preferable to set the value to / s or less.

[0081] The viscosity index of the lubricating oil composition of one embodiment of the present invention is preferably 70 or more, 80 or more, 90 or more, 100 or more, 110 or more, 120 or more, 125 or more, 130 or more, 140 or more, or 150 or more, and may be 300 or less, 270 or less, 250 or less, 240 or less, 230 or less, 220 or less, 200 or less, 190 or less, 180 or less, 170 or less, or 160 or less.

[0082] The SAE standard viscosity of the lubricating oil composition of one embodiment of the present invention is preferably 0W-20, 0W-30, 0W-40, 5W-20, 5W-30, 5W-40, 10W-30, 10W-40, 15W-40, 20W-40, or 25W-40, and more preferably 5W-30, 10W-30, or 10W-40.

[0083] The base number of the lubricating oil composition of one embodiment of the present invention is preferably 1.0 mgKOH / g or more, 1.5 mgKOH / g or more, 2.0 mgKOH / g or more, 2.5 mgKOH / g or more, 3.0 mgKOH / g or more, 3.5 mgKOH / g or more, 4.0 mgKOH / g or more, 4.5 mgKOH / g or more, 5.0 mgKOH / g or more, or 5.5 mgKOH / g or more, and further preferably 6.0 mgKOH / g or more, 6.5 mgKOH / g or more, 7.0 mgKOH / g or more, 7.5 mgKOH / g or more, or / g or more, 8.0 mgKOH / g or more, 8.5 mgKOH / g or more, or 9.0 mgKOH / g or more, and is preferably 15.0 mgKOH / g or less, 12.0 mgKOH / g or less, 10.0 mgKOH / g or less, 9.7 mgKOH / g or less, 9.5 mgKOH / g or less, 9.0 mgKOH / g or less, 8.5 mgKOH / g or less, 8.0 mgKOH / g or less, 7.5 mgKOH / g or less, 7.0 mgKOH / g or less, or 6.5 mgKOH / g or less.

[0084] The sulfated ash content of the lubricating oil composition of one embodiment of the present invention is preferably 1.20 mass% or less, 1.10 mass% or less, 1.00 mass% or less, less than 1.00 mass%, 0.95 mass% or less, 0.90 mass% or less, 0.85 mass% or less, 0.80 mass% or less, 0.75 mass% or less, 0.70 mass% or less, 0.65 mass% or less, 0.60 mass% or less, 0.55 mass% or less, or 0.50 mass% or less, based on the total amount (100 mass%) of the lubricating oil composition. In this specification, sulfated ash content refers to the value measured in accordance with JIS K2272:1998.

[0085] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of magnesium atoms is, based on the total amount (100 mass%) of the lubricating oil composition, 240 ppm by mass or more, 260 ppm by mass or more, 280 ppm by mass or more, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 400 ppm by mass or more, 450 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 490 ppm by mass or more, 500 ppm by mass or more, 510 ppm by mass or more, 520 ppm by mass or more, 530 ppm by mass or more, 540 ppm by mass or more, 550 ppm by mass or more, 560 ppm by mass or more, 570 ppm by mass or more, 580 ppm by mass or more, 590 ppm by mass or more, 600 ppm by mass or more, 610 ppm by mass or more, 620 ppm by mass or more, 630 ppm by mass or more, 640 ppm by mass or more, 650 ppm by mass or more, 660 ppm by mass or more, 670 ppm by mass or more, 680 ppm by mass or more, 690 ppm by mass or more, 700 ppm by mass or more, 710 ppm by mass or more, 720 ppm by mass or more, 730 ppm by mass or more, 740 ppm by mass or more, 750 ppm by mass or more, 760 ppm by mass or more, 770 ppm by mass or more, 780 ppm by mass or more, 790 ppm by mass or more, 790 ppm by mass or more It is preferable that the concentration is 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more, 510 ppm by mass or more, 520 ppm by mass or more, 530 ppm by mass or more, 540 ppm by mass or more, or 550 ppm by mass or more, and further 560 ppm by mass or more, 580 ppm by mass or more, 600 ppm by mass or more, 700 ppm by mass or more, 800 ppm by mass or more, 900 ppm by mass or more, It may be 1000 mass ppm or more, 1100 mass ppm or more, 1200 mass ppm or more, 1300 mass ppm or more, 1400 mass ppm or more, 1500 mass ppm or more, 1600 mass ppm or more, or 1700 mass ppm or more, and may be 3000 mass ppm or less, 2500 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1700 mass ppm or less, 1600 mass ppm or less, or 1700 mass ppm or more. pm or less, 1500 mass ppm or less, 1400 mass ppm or less, 1300 mass ppm or less, 1200 mass ppm or less, 1100 mass ppm or less, 1000 mass ppm or less, 950 mass ppm or less, 900 mass ppm or less Below, it may be 850 mass ppm or less, 800 mass ppm or less, 750 mass ppm or less, 700 mass ppm or less, 650 mass ppm or less, 600 mass ppm or less, 580 mass ppm or less, or 560 mass ppm or less.

[0086] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the calcium atom content is preferably 240 ppm by mass or more, 260 ppm by mass or more, 280 ppm by mass or more, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more, 520 ppm by mass or more, 540 ppm by mass or more, 560 ppm by mass or more, or 580 ppm by mass or more, based on the total amount (100 mass%) of the lubricating oil composition. The concentration may be 3000 mass ppm or less, 2500 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1700 mass ppm or less, 1600 mass ppm or less, 1500 mass ppm or less, 1400 mass ppm or less, or 3000 mass ppm or less, 2500 mass ppm or less, 2000 mass ppm or less, 1900 mass ppm or less, 1800 mass ppm or less, 1700 mass ppm or less, 1600 mass ppm or less, 1500 mass ppm or less, 1400 mass ppm or less. Quantity ppm or less, 1300 mass ppm or less, 1200 mass ppm or less, 1100 mass ppm or less, 1000 mass ppm or less, 950 mass ppm or less, 900 mass ppm or less, 850 mass ppm or less The amount may be less than or equal to 800 mass ppm, 750 mass ppm or less, 700 mass ppm or less, 650 mass ppm or less, 600 mass ppm or less, or 580 mass ppm or less.

[0087] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that further improves wear resistance and clutch characteristics while ensuring safety to living organisms, the content of boron atoms is, based on the total amount of the lubricating oil composition, 50 ppm by mass or more, 70 ppm by mass or more, 90 ppm by mass or more, 100 ppm by mass or more, 110 ppm by mass or more, 120 ppm by mass or more, 130 ppm by mass or more, 140 ppm by mass or more, 160 ppm by mass or more, 180 ppm by mass or more, 200 ppm by mass or more, 220 ppm by mass or more, 240 ppm by mass or more, is preferably 260 ppm by mass or more, and is preferably 400 ppm by mass or less, 380 ppm by mass or less, 360 ppm by mass or less, 340 ppm by mass or less, 330 ppm by mass or less, 320 ppm by mass or less, 310 ppm by mass or less, 300 ppm by mass or less, 290 ppm by mass or less, 280 ppm by mass or less, or 270 ppm by mass or less, and may further be 250 ppm by mass or less, 220 ppm by mass or less, 200 ppm by mass or less, 180 ppm by mass or less, 160 ppm by mass or less, or 140 ppm by mass or less.

[0088] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition that has improved wear resistance while ensuring safety to living organisms, the content of zinc atoms is, based on the total amount (100 mass%) of the lubricating oil composition, 300 ppm by mass or more, 320 ppm by mass or more, 340 ppm by mass or more, 360 ppm by mass or more, 380 ppm by mass or more, 400 ppm by mass or more, 420 ppm by mass or more, 440 ppm by mass or more, 460 ppm by mass or more, 480 ppm by mass or more, 500 ppm by mass or more It is preferable that the concentration is 2000 ppm by mass or less, 1500 ppm by mass or less, 1200 ppm by mass or less, 1000 ppm by mass or less, 900 ppm by mass or less, 800 ppm by mass or less, 750 ppm by mass or less, 700 ppm by mass or less, 650 ppm by mass or less, 600 ppm by mass or less, or 580 ppm by mass or less.

[0089] The content of molybdenum atoms in the lubricating oil composition of one embodiment of the present invention may be, based on the total amount (100% by mass) of the lubricating oil composition, less than 1000 ppm by mass, less than 500 ppm by mass, less than 100 ppm by mass, less than 50 ppm by mass, less than 40 ppm by mass, less than 30 ppm by mass, 20 ppm by mass or less, less than 10 ppm by mass, less than 5.0 ppm by mass, less than 2.0 ppm by mass, less than 1.0 ppm by mass, less than 100 ppb by mass, less than 10 ppb by mass, or less than 1.0 ppb by mass.

[0090] In the lubricating oil composition of one embodiment of the present invention, the nitrogen atom content is preferably 200 ppm by mass or more, 250 ppm by mass or more, 300 ppm by mass or more, 350 ppm by mass or more, 400 ppm by mass or more, 450 ppm by mass or more, 500 ppm by mass or more, 550 ppm by mass or more, 600 ppm by mass or more, 650 ppm by mass or more, or 700 ppm by mass or more, based on the total amount (100% by mass) of the lubricating oil composition. The concentration may be 100 ppm by mass or more, or 800 ppm by mass or more, and is preferably 3000 ppm by mass or less, 2500 ppm by mass or less, 2000 ppm by mass or less, 1800 ppm by mass or less, 1600 ppm by mass or less, 1400 ppm by mass or less, 1200 ppm by mass or less, 1000 ppm by mass or less, 900 ppm by mass or less, or 850 ppm by mass or less, and may further be 800 ppm by mass or less, or 750 ppm by mass or less.

[0091] In the lubricating oil composition of one embodiment of the present invention, the content of sulfur atoms is preferably 500 ppm by mass or more, 600 ppm by mass or more, 700 ppm by mass or more, 800 ppm by mass or more, 900 ppm by mass or more, 1000 ppm by mass or more, 1050 ppm by mass or more, 1100 ppm by mass or more, 1150 ppm by mass or more, or 1200 ppm by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, and further preferably 1300 ppm by mass or more, 1400 ppm by mass or more, 1600 ppm by mass or more, 1800 ppm by mass or more, 2000 ppm by mass or more, 2200 ppm by mass or more, It may be 2400 ppm by mass or more, or 2400 ppm by mass or more, and is preferably 4000 ppm by mass or less, 3500 ppm by mass or less, 3000 ppm by mass or less, 2500 ppm by mass or less, 2200 ppm by mass or less, 2100 ppm by mass or less, 2000 ppm by mass or less, 1900 ppm by mass or less, 1800 ppm by mass or less, 1700 ppm by mass or less, 1600 ppm by mass or less, 1500 ppm by mass or less, 1450 ppm by mass or less, 1400 ppm by mass or less, 1350 ppm by mass or less, 1300 ppm by mass or less, or 1250 ppm by mass or less.

[0092] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that has a well-balanced improvement in wear resistance and clutch characteristics while ensuring safety to living organisms, the ratio of the content of sulfur atoms to the content of magnesium atoms [S / Mg] is 0.10 or more, 0.50 or more, 0.60 or more, 0.70 or more, 0.80 or more, 0.90 or more, 1.00 or more, 1.10 or more, 1.20 or more, 1.30 or more, 1.40 or more, 1.50 or more, 1.60 or more, 1.70 or more, 1.80 or more, 1.9 ...90 or more, 1.90 or more, 1.90 or more, 1.90 or more, 1.90 or more, 1.90 or more, 1.90 or more, It is preferably 60 or more, 1.70 or more, 1.80 or more, 1.90 or more, 2.00 or more, or 2.10 or more, and is preferably 6.00 or less, 5.50 or less, 5.00 or less, 4.50 or less, 4.00 or less, 3.80 or less, 3.60 or less, 3.40 or less, 3.20 or less, 3.00 or less, 2.90 or less, 2.80 or less, 2.70 or less, 2.60 or less, 2.50 or less, 2.40 or less, 2.30 or less, or 2.20 or less. It is also preferable that the ratio [S / Mg] of the content of sulfur atoms to the content of magnesium atoms derived from component (B1) is within the above range.

[0093] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition that ensures biological safety while further improving wear resistance and clutch characteristics in a balanced manner, the ratio of the content of sulfur atoms to the total content of magnesium atoms and calcium atoms [S / (Mg+Ca)] is 0.10 or more, 0.15 or more, 0.20 or more, 0.25 or more, 0.30 or more, 0.35 or more, 0.40 or more, 0.45 or more, 0.50 or more, 0.55 or more, 0.60 or more, 0.65 or more, 0.70 or more, 0.80 or more, 0.85 or more, 0.90 or more, 0.9 ... Preferably, the sulfur content is 0.75 or more, 0.80 or more, 0.85 or more, 0.90 or more, 0.95 or more, 1.00 or more, or 1.05 or more, and is 5.00 or less, 4.50 or less, 4.00 or less, 3.50 or less, 3.00 or less, 2.50 or less, 2.00 or less, 1.90 or less, 1.80 or less, 1.70 or less, 1.65 or less, 1.60 or less, 1.55 or less, 1.50 or less, 1.45 or less, 1.40 or less, 1.35 or less, 1.30 or less, 1.25 or less, or 1.20 or less. The ratio [S / (Mg+Ca)] of the content of sulfur atoms to the total content of magnesium atoms derived from component (B1) and calcium atoms derived from component (B2) is also preferably within the above range.

[0094] The amount of wear of the blocks and pins measured using a lubricating oil composition according to one embodiment of the present invention by the method described in the Examples below is preferably less than 44.0 mg, more preferably 43.6 mg or less, even more preferably 40.0 mg or less, still more preferably 38.0 mg or less, and particularly preferably 36.0 mg or less.

[0095] The value of dμ / dV(10)×1000 measured and calculated using a lubricating oil composition according to one embodiment of the present invention by the method described in the Examples below is preferably 0 or greater, more preferably 0.10 or greater, even more preferably 0.20 or greater, still more preferably 0.30 or greater, and particularly preferably 0.40 or greater.

[0096] [Uses of the Lubricating Oil Composition] The lubricating oil composition of one embodiment of the present invention is substantially free of TPP, and is excellent in wear resistance and clutch properties while ensuring safety to living organisms, and therefore can be suitably used for lubricating equipment mounted on motorcycles.

[0097] In consideration of the above-described properties of the lubricating oil composition of one embodiment of the present invention, the present invention can also provide the following [I] and [II]. [I] A two-wheeled vehicle equipped with equipment lubricated with the lubricating oil composition of one embodiment of the present invention. [II] A lubrication method in which equipment mounted on a two-wheeled bicycle is lubricated with the lubricating oil composition of one embodiment of the present invention. Examples of the equipment described in [I] and [II] above include engines and transmissions. In other words, the lubricating oil composition of one embodiment of the present invention functions as both an engine oil and a power transmission lubricant, and can be used to lubricate both the engine and the transmission.

[0098] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. The methods for measuring various physical properties are as follows.

[0099] (1) Kinematic viscosity and viscosity index: Measured and calculated in accordance with JIS K2283:2000. (2) Base number (perchloric acid method): Measured in accordance with "9. Potentiometric titration method (base number, perchloric acid method)" of JIS K2501 "Petroleum products and lubricants - Neutralization number test method." (3) Contents of magnesium atoms (Mg), calcium atoms (Ca), phosphorus atoms (P), zinc atoms (Zn), boron atoms (B), sulfur atoms (S), and molybdenum atoms (Mo): Measured in accordance with ASTM D4951. (4) Contents of nitrogen atoms (N): Measured in accordance with ASTM D4629. (5) Sulfated ash content: Measured in accordance with JIS K2272:1998.

[0100] Examples 1-2 and Comparative Examples 1-3: Lubricating oil compositions were prepared by adding and mixing the base oil and various additives in the amounts shown in Table 1. Details of the components used in preparing the lubricating oil compositions are as follows. The contents of other additives include diluent oil (mineral oil). The non-boron succinimide was prepared in the same amount in all Examples and Comparative Examples, ranging from 1.0 to 3.0 mass% based on the total amount of the lubricating oil composition. The lubricating oil compositions prepared in the Examples and Comparative Examples did not contain any metal phenate, and the TPP content was less than 0.1 mass%. Therefore, the lubricating oil compositions were substantially free of TPP.

[0101] <Base oil> "Mineral oil (a-1)": base oil classified into Group III of the API base oil category, kinematic viscosity at 40°C = 44 mm ２ / s, 100℃ kinematic viscosity = 7.2mm ２ / s, viscosity index = 127. <Various Additives> - "Mg Sulfonate (b-1)": Overbased magnesium sulfonate with a base number of 405 mg KOH / g, Mg content = 9.3 mass%, S content = 1.74 mass%. - "Ca Sulfonate (b-2)": Overbased calcium sulfonate with a base number of 307 mg KOH / g, Ca content = 11.6 mass%, S content = 1.63 mass%. - "Boron-modified succinimide (c-1)": Boron-modified mono-type alkenyl succinimide represented by the general formula (c-2), B atom content = 1.30 mass%, N atom content = 1.23 mass%, B / N ratio = 1.06. "ZnDTP (d-1)": secondary zinc dialkyldithiophosphate, P atom content = 7.85 mass%, Zn atom content = 7.2 mass%, S atom content = 14.4 mass%. "Other additives": additive mixture of a viscosity index improver consisting of a star polymer with Mw = 600,000, a pour point depressant, a non-boron succinimide, an antioxidant, and an antifoaming agent.

[0102] The kinematic viscosity at 40°C and 100°C, viscosity index, content of each element, sulfated ash, and TPP content of the prepared lubricating oil compositions were measured or calculated, and the following wear resistance test and clutch friction property test were also carried out. The results are shown in Table 1.

[0103] [Wear Resistance Test] The following pin and block were set in a FALEX testing machine described in ASTM D3233, and 60 g of the lubricating oil composition to be evaluated was introduced into the test vessel. The wear amount (mg) of the block and pin was measured under the following conditions. Note that if seizure occurred or the wear amount reached 44.0 mg or more, the test was terminated without carrying out the next clutch characteristics test. <Test Conditions> Test pin: SAE3135 Test block: AISI1137 Rotation speed: 800 rpm Test temperature: 80°C Test load: 1334 N Test time: 60 minutes

[0104] [Clutch characteristic test] The following friction plate and steel plate were assembled in a low-speed sliding friction tester described in JASO M349, and 150 mL of the lubricating oil composition to be evaluated was introduced. A break-in was carried out under the following break-in conditions. After the break-in, the friction coefficients of the friction plate and steel plate were measured under the following μ-V characteristic measurement conditions. At this time, the friction coefficient per rotation (μ １ ) and the friction coefficient (μ １０ ) was obtained, and the value of "dμ / dV(10) × 1000" was calculated using the following formula. The value of "dμ / dV(10) × 1000" indicates the slope of the friction coefficient with respect to the rotation speed, and lubricating oil compositions for which this value is negative are considered to cause clutch slippage when applied to a motorcycle. dμ / dV(10) × 1000 = (μ １０ -μ １ ) / 9 x 1000 <Friction plate and steel plate> Friction plate: A795. D0AK Steel plate: FZ132-8Y2 <Break-in test conditions> Oil temperature: 80°C Break-in surface pressure: 1.00 MPa Sliding speed: 0.60 m / s Time: 30 minutes <μ-V characteristic measurement conditions> Oil temperature: 80°C Measurement surface pressure: 1.00 MPa Sliding speed: 0 to 1.5 m / s

[0105]

[0106] As can be seen from Table 1, the lubricating oil compositions prepared in Examples 1 and 2 exhibited excellent wear resistance and clutch characteristics despite being substantially free of TPP. Therefore, these lubricating oil compositions can be suitably used to lubricate equipment installed in motorcycles. On the other hand, in Comparative Examples 1 and 3, the wear amount was 44.0 mg or more or seizure occurred, so the clutch characteristics test was terminated without being performed. Furthermore, the lubricating oil composition of Comparative Example 2 had a negative value for dμ / dV(10) × 1000, suggesting that clutch slippage would occur if the lubricating oil composition were applied to a motorcycle.

Claims

1. A lubricating oil composition for use in lubricating equipment mounted on a motorcycle, comprising a base oil (A), a metal-based detergent (B) containing a magnesium sulfonate (B1), a boron-modified succinimide (C), and an organic zinc dithiophosphate (D), wherein the phosphorus atom content is 500 ppm by mass or more and 900 ppm by mass or less, based on the total amount of the lubricating oil composition, and the lubricating oil composition is substantially free of tetrapropenylphenol.

2. The lubricating oil composition according to claim 1, wherein the content of component (B1) in terms of magnesium atoms is 500 mass ppm or more based on the total amount of the lubricating oil composition.

3. The lubricating oil composition according to claim 1 or 2, wherein the content of component (D) in terms of zinc atoms is 300 mass ppm or more based on the total amount of the lubricating oil composition.

4. The lubricating oil composition according to any one of claims 1 to 3, wherein the content of molybdenum atoms is less than 100 ppm by mass based on the total amount of the lubricating oil composition.

5. The lubricating oil composition according to any one of claims 1 to 4, which is substantially free of metal phenates.

6. The lubricating oil composition according to any one of claims 1 to 5, wherein the total content of sulfur-containing compounds (S) selected from the group consisting of thiazole compounds, thiadiazole-based compounds, dithiocarbamate-based compounds, molybdenum dithiocarbamate-based compounds, dihydrocarbyl polysulfite-based compounds, and sulfurized esters, calculated as sulfur atoms, is less than 0.01 mass% based on the total amount of the lubricating oil composition.

7. The lubricating oil composition according to any one of claims 1 to 6, wherein component (B) contains calcium sulfonate (B2) together with component (B1).

8. The lubricating oil composition according to claim 7, wherein the ratio [Mg / Ca] of the content of magnesium atoms derived from component (B1) to the content of calcium atoms derived from component (B2) is 0.40 or more.

9. The lubricating oil composition according to any one of claims 1 to 8, wherein the calcium salicylate content is less than 10.0 mass % based on the total amount of component (B).

10. The lubricating oil composition according to any one of claims 1 to 9, wherein the content of boron atoms derived from component (C) is 50 to 400 ppm by mass, based on the total amount of the lubricating oil composition.

11. The lubricating oil composition according to any one of claims 1 to 10, wherein the content of sulfur atoms is 500 to 4,000 ppm by mass based on the total amount of the lubricating oil composition.

12. The lubricating oil composition according to any one of claims 1 to 11, wherein the sulfated ash content is 1.20 mass % or less, based on the total amount of the lubricating oil composition.

13. A lubrication method for lubricating equipment mounted on a motorcycle using the lubricating oil composition according to any one of claims 1 to 12.

14. The lubrication method of claim 13, wherein the equipment includes an engine and a transmission.

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