WO2007052826A1

WO2007052826A1 - Lubricant composition

Info

Publication number: WO2007052826A1
Application number: PCT/JP2006/322318
Authority: WO
Inventors: Hitoshi Komatsubara; Shigeki Matsui
Original assignee: Nippon Oil Corporation
Priority date: 2005-11-02
Filing date: 2006-11-01
Publication date: 2007-05-10
Also published as: JP2007126542A

Abstract

A lubricant that has excellent scratch noise preventing capability and excels with good balance in inter-metallic frictional coefficient and shudder preventing performance, and that is suitable for use as an oil of continuously variable transmission equipped with a belt CVT and a slip control wet clutch. There is provided a lubricant composition comprising a lubricant base oil and, contained therein, (A) metallic cleaning agent and (B) friction regulating agent, wherein on the basis of the whole amount of composition, (B1) fatty acid metal salt friction regulating agent is contained in an amount of 0.01 to 5 mass% and (A1) sulfonate cleaning agent and/or (A2) salicylate cleaning agent contained in an amount of 0.01 to 0.4 mass% in terms of metal quantity.

Description

Lubricating oil composition

[Technical field]

The present invention relates to a lubricating oil composition, and more particularly, to maintain the anti-shudder performance in a slip control type wet clutch of an automatic transmission for a long period of time, and to reduce the friction coefficient between metals when applied to a belt type CVT of an automobile. While maintaining a high level (maintaining high power transmission capacity), it is possible to prevent the occurrence of scratching noise by making the μ 1 V characteristic positive slope, in particular, continuously variable transmission with belt type CVT and starting clutch The present invention relates to a lubricating oil composition suitable for a machine. book

[Background]

Recent automatic transmissions and continuously variable transmissions are desired to be lighter and smaller, and as the combined output of the engine increases, the power transmission capacity is being improved. Some of these automatic transmissions and continuously variable transmissions have a control (slip lock-up control) that causes the lock-up clutch built in the torque converter to slide at a low speed. Improvements are being made so that engine torque can be efficiently transmitted to the speed change mechanism while absorbing and improving ride comfort. In addition, some continuously variable transmissions are provided with a wet start clutch, and the start clutch is first slid and then connected to perform smooth start from a stop state. Slip control is performed. The lubricating oil used in transmissions that perform slip control, such as these lock-up clutches and starting clutches, has excellent torque transmission force and low shift shock, and excellent initial anti-shudder performance. Performance that is maintained for a long time is required.

On the other hand, some continuously variable transmissions have a belt-type CVT composed of a driving pulley, a driven pulley, and a belt for transmitting power. The belt is an element (hereinafter referred to as a top). It consists of a belt (steel strip) that holds it. The lubricating oil used in such belt-type CVTs has the ability to transmit power with cooling, lubricity, and wear resistance, and with a higher coefficient of friction between the metal pulley and metal belt. There is a demand for excellent products.

In addition, in vehicles using belt-type CVTs, a phenomenon that generates noise (scratch noise) peculiar to garage entry, start-up, etc., a so-called scratch phenomenon may occur.

This scratch phenomenon is caused by uneven rotation of the driven pulley, and is found to be caused by the gear rattling noise behind the CVT. Further, the uneven rotation is due to the friction coefficient () between the belt and the top. It has also been found that the change occurs when the slope is negative with respect to the change in velocity (V) (see, for example, Patent Document 1).

Therefore, in a continuously variable transmission having a belt-type CV and a slip-control type wet clutch such as a lock-up clutch or a start-up clutch, the anti-shudder performance is maintained for a long period of time, and between the metal pulley and the metal belt. It is important to keep the coefficient of friction high (keep the power transmission capability high) and prevent the generation of scratch noise by making the μ_V characteristic positive.

Conventionally, as a transmission oil composition capable of improving scratch noise prevention, improvement of friction coefficient between metals and durability of shudder prevention, for example, Patent Document 1 includes sulfonate, ashless dispersant, acid By blending an amide, an organomolybdenum compound and an amine-based antioxidant, it is possible to prevent the scratch phenomenon while maintaining a large transmission power, and to maintain the μ-V characteristic at a positive gradient for a long time. Patent Document 2 discloses that a continuously variable transmission oil composition includes a phosphorus: calcium: boron: io element ratio at a specific ratio, thereby preventing a scratch phenomenon and preventing this over a long period of time. A lubricating oil composition is disclosed in Patent Document 3, which contains an organic acid metal salt having a specific structure, an antiwear agent, and boron-containing succinic acid imide as essential components. A lubricating oil composition for a continuously variable transmission that achieves both a friction coefficient and a slip control mechanism for a slip control mechanism is disclosed in Patent Document 4 as calcium salicylate, phosphorus-based antiwear agent, friction modifier, and distributed viscosity index. A lubricating oil composition for a continuously variable transmission that combines a high coefficient of friction between metals and an anti-shudder property with respect to a slip control mechanism and that can be used for a long period of time is disclosed in Patent Document 5 as calcium sulfonate and It has anti-shudder life performance for slip lock-up devices and contains sarcosine derivatives or reaction products of carboxylic acids and amines, and prevents scratching noise for belt-type CVT devices. Long-life performance An automatic transmission oil composition is disclosed.

However, there is a trade-off relationship between the anti-scratch noise and anti-shudder properties and the coefficient of friction between metals, and there is room for further improvement from the viewpoint of balancing these performances.

Patent Document 1: Japanese Patent Laid-Open No. 9-263782

Patent Document 2: Japanese Patent Laid-Open No. 2003-73683

Patent Document 3: Japanese Patent Laid-Open No. 2001-32329.2

Patent Document 4: Japanese Unexamined Patent Publication No. 2000-355695

Patent Document 5: Japanese Patent Laid-Open No. 10-306292

[Disclosure of the Invention]

In view of the circumstances as described above, the object of the present invention is to maintain the anti-skid performance of the slip control type wet clutch for a long period of time and maintain a high coefficient of friction between metals of the metal pulley and the metal belt (high power transmission capability). By maintaining the μ-V characteristic with a positive slope and preventing the occurrence of scratching noise, a lubricating oil composition suitable for a continuously variable transmission having a belt-type CVT and a starting clutch is provided. is there.

As a result of intensive studies to solve the above problems, the present inventors have found that a lubricating oil composition containing a specific metal-based cleaner and a specific friction modifier, or further a specific phosphorus-based antiwear agent, The present inventors have found that the above problems can be improved and have completed the present invention. That is, the present invention relates to a lubricating oil composition containing (i) a metal-based detergent and (ii) a friction modifier in a lubricating base oil, and based on the total amount of the composition: (A 1) a sulfonate-based detergent And / or (Α2) 0.01 to 0.4% by mass of salicylate detergent as a metal amount, and (B1) 0.01 to 5% by mass of a fatty acid metal salt friction modifier. The lubricating oil composition is characterized in that.

The present invention further comprises (さらに 2) an alkanolamine-based friction modifier in an amount of 0.01 to 5% by mass based on the total amount of the composition. Lubricating oil composition.

Further, the present invention further provides (C) a phosphorus-based antiwear agent: (C 1) an alkyl phosphate having an alkyl group with a carbon number of 17 or less and / or (C 2) a carbon atom having 6 to 12 carbon atoms. Rukir) Aryl Phosphite as a phosphorus amount based on the total amount of the composition 0.001 The lubricating oil assembly 1¾ product according to claim 1 or 2, characterized by comprising ~ 0.1 mass%.

Further, the present invention is characterized in that the amount of metal of (e 2) component (M e B) / (A 1) of component (M e A) force is 0 or more than 0 and 1.5 or less. The lubricating oil composition according to 1 or 2.

In the present invention, the component (A 2) has a constituent ratio of the monoalkyl salicylic acid metal salt of 85 to 100 mo 1% and a constituent ratio of the dialkyl salicylic acid metal salt of 0 to 15 mo 1%. 3. The alkyl salicylic acid metal salt ¾ |, and / or its (per) basic salt, wherein the composition ratio of the 3—alkyl salicylic acid metal salt is 40 to 10 O O 1%. Lubricating oil composition.

The present invention is also directed to the lubricating oil composition according to claim 1 or 2, wherein the lubricating oil composition is for an automatic transmission or a continuously variable transmission.

3. The lubricating oil composition according to claim 1, wherein the lubricating oil composition is used for a continuously variable transmission having a belt type CVT and a slip control type wet clutch.

The lubricating oil composition according to claim 1 or 2, wherein the slip control type wet clutch is a starting clutch.

[The invention's effect]

The lubricating oil composition of the present invention is excellent for use in continuously variable transmissions having a slip-type wet clutch such as a belt-type CVT and a starting clutch, which have excellent scratch noise prevention properties, excellent friction coefficient between metals, and anti-shudder performance. It is a particularly suitable lubricating oil composition, and is also suitable for a lubricating oil composition for an automatic transmission because it can be expected to improve the anti-shudder life.

[Best Mode for Carrying Out the Invention]

The present invention is described in detail below.

The lubricating base oil in the lubricating oil composition of the present invention is not particularly limited, and mineral oil base oils and synthetic base oils used for ordinary lubricating oils can be used.

Specifically, as mineral base oils, lubricating oil fractions obtained by depressurizing and distilling atmospheric residual oil obtained by atmospheric distillation of crude oil can be desolvated, solvent extracted, and hydrocracked. , Hydrogen different Refined by one or more treatments such as liquefaction, solvent dewaxing, hydrorefining, etc., or base oil produced by isomerizing wax isomerized mineral oil, GTL WAX (gastric liquid wax), etc. Can be illustrated.

Specific examples of synthetic base oils include polybutene or a hydride thereof; 1-octenolomer, 1-deceneoligomers, etc., poly- _α -olefins or hydrides thereof; ditridecylglutarate, di-2 -Diestenole such as ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, and di-2-ethylhexyl sebacate; And polyol esters such as pentaerythritol 2-ethyl hexanoate and pentaerythritol pelargonate; aromatic synthetic oils such as alkylnaphthalene, alkylbenzene, and aromatic ester, or mixtures thereof.

As the lubricating base oil in the present invention, the above mineral base oil, the above synthetic base oil, or an arbitrary mixture of two or more selected from these can be used. For example, there may be mentioned one or more mineral base oils, one or more synthetic base oils, a mixed oil of one or more mineral base oils and one or more synthetic base oils.

The kinematic viscosity of the lubricating base oil used in the present invention is not particularly limited, but the kinematic viscosity at 100 ° C is preferably ² to 8 mm ² Zs, more preferably ^{2.5 to} 6 mm ² Z s, It is particularly preferable that the thickness is adjusted to 3 to 4.5 mm ² / s. When the kinematic viscosity of the lubricating base oil at 100 ° C exceeds Smm ² , s, the low-temperature viscosity characteristics deteriorate, while when the kinematic viscosity is less than 2 mm ² / s, Insufficient oil film formation results in poor lubricity and increases the evaporation loss of the lubricating base oil, which is not preferable.

The sulfur content of the lubricating base oil used in the present invention is not particularly limited, but is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and still more preferably 0.01. It is desirable that it is less than mass%.

The evaporation loss amount of the lubricating base oil is not particularly limited, but the NOACK evaporation amount is preferably adjusted to 10 to 50% by mass, more preferably 20 to 40% by mass, and particularly preferably 22 to 35% by mass. It is desirable that By using a lubricating base oil whose NO AC K evaporation amount is adjusted within the above range, both low temperature characteristics and wear resistance can be achieved. The NO AC K evaporation here means the evaporation measured in accordance with CEC L-40-V-87.

Specific examples of the lubricating base oil in the present invention include: (a) a kinematic viscosity at 100 ° C. of 1.5 to 3.5 mm ² Z s, preferably ^{2 to} 3.2 mm ² / s, more preferably 2. 5 to ³ mm ² Z s, and the sulfur content is 0.05 mass% or less, preferably 0.0 1 mass% or less, more preferably 0.005 mass. / ₀ or less, NO AC K evaporation amount 20-80 mass. / ₀ , preferably 30 to 65 mass%, more preferably 30 to 55 mass%, and (b) a kinematic viscosity at 100 ° C. of 3.5 to 6 mm ² _/ s, preferably 3. 8 to 4.5 mm ² / s, more preferably 3.9 to 4.3 mm ² / s, and the sulfur-containing soot content is 0.05% by mass or less, preferably 0.0 1% by mass or less, more preferably 0 005% by mass or less and NO ACK evaporation amount of 5 to 20% by mass, preferably 10 to 18% by mass, more preferably 12 to 16% by mass of base oil, 10: 90 to 90% 90:10, preferably 25:75 to 75:25, more preferably 25:75 to 50:50, and kneading viscosity, sulfur content and NOACK of the mixed base oil at 100 ° C. It is preferable that the evaporation amount be in the above range. As a result, it is possible to obtain a composition that can satisfy both low temperature characteristics and lubricating performance suitable as a transmission oil composition.

The above mixed base oil has a kinematic viscosity of 6 mm ² Z s or more at 100 ° C, preferably 10 to 35 mm ² / s, and a sulfur content of 0.05 from the viewpoint of improving fatigue life. To 1% by mass, preferably 0.1 to 0.7% by mass, more preferably 0.2 to 0.6% by mass, 1 ^ 0 01: the evaporation amount is 10% by mass or less, preferably 5% by mass or less More preferably, a base oil of 3% by mass or less may be mixed in a small amount, for example, 5-30% by mass.

The component (A) in the lubricating oil composition of the present invention is (A 1) a sulfonate detergent and Z or (A2) a salicylate detergent, and its structure is not particularly limited and can be used.

(A 1) Examples of the sulfonate detergent include alkyl aromatic sulfonic acids obtained by sulfonating alkyl aromatic compounds having a molecular weight of 100 to 1,500, preferably 200 to 700. A lithium metal salt or an alkaline earth metal salt, in particular, a magnesium salt and a Z or calcium salt are preferably used, Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid. As the petroleum sulfonic acid, what is commonly referred to as mahogany acid, which is produced as a by-product during the production of white oil, is obtained by sulfonating an alkyl aromatic compound in a lubricating oil fraction of mineral oil. Synthetic sulfonic acids have linear or branched alkyl groups, for example, by-produced from an alkylbenzene production plant that is a raw material for detergents or obtained by alkylating polyolefin to benzene. A sulfonated product of alkylbenzene as a raw material or a sulfonated product of dinonylnaphthalene is used. The sulfonating agent for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid and sulfuric acid are usually used.

In addition, as the alkaline earth metal sulfonate, the above-mentioned alkyl aromatic sulfonic acid can be directly combined with an alkaline earth metal base such as magnesium or / or calcium alkaline earth metal oxide or hydroxide. Not only neutral alkaline earth metal sulfonates obtained by reacting them, or once replacing them with alkaline earth metal salts such as sodium salts and strong lithium salts, and then replacing them with alkaline earth metal salts. A base obtained by heating the above neutral alkaline earth metal sulfonate and excess alkaline earth metal salt or alkaline earth metal salt (hydroxide or oxide) in the presence of water. The basic alkaline earth metal sulfonate, the neutral alkaline earth metal sulfonate is reacted with the alkaline earth metal base in the presence of carbon dioxide and Z or boric acid or borate. More resulting carbonate overbased Al force Li earth metal sulfonates, also include borate overbased alkaline earth metal sulfonate.

As the sulfonate detergent in the present invention, the above neutral alkaline earth metal sulfonates, basic alkaline earth metal sulfonates, overbased alkaline earth metal sulfonates, and mixtures thereof can be used. .

As the component (A 1) in the present invention, it is preferable to use a calcium sulfonate detergent or a magnesium sulfonate detergent, and it is particularly preferable to use a calcium sulfonate detergent in terms of improving the coefficient of friction between metals. preferable.

Sulfonate detergents are usually marketed in a state diluted with a light lubricating base oil or the like, and are also available, but generally the metal content is 1.0 to 20 mass. %, Preferably 2.0 to 16% by mass. The base number of the sulfonate detergent used in the present invention is arbitrary, and is usually 0 to 500 mg KOHZg. However, the base number is from 100 to 100 because it is superior in improving the friction coefficient between metals and wet friction characteristics. It is desirable to use 45 Omg KOH / g, preferably 200-40 Omg KOHZg.

The base number here means the base number by the perchloric acid method measured according to 7 of JIS K250 1 “Testing method for neutralization value of petroleum products and lubricants”. In the lubricating oil composition of the present invention, the content of the component (A 1) is preferably from 0.001 to 0.4% by mass as the metal equivalent (Me A) based on the total amount of the composition. Ku is 0. a 0 1～O. 3 wt%, more preferably 0.02 to 0.2 mass ^_0/0, and particularly preferably from 0.04 to 0.1 5 wt%. By making the content of the (A 1) component within the above range, it is possible to extend the anti-shudder life compared to the case where the (A 1) component is not blended, and to further improve the μ-V characteristics between metals.

The component (油 2) in the lubricating oil composition of the present invention is a salicylate detergent, and the structure thereof is not particularly limited, but a metal salt of salicylic acid having 1 to 2 alkyl groups having 1 to 40 carbon atoms, Alkali metal salts or alkaline earth metal salts, particularly magnesium salts and cocoons or calcium salts are preferably used.

As the component (Α2) in the present invention, a salicylate detergent containing a dialkyl salicylic acid metal salt is preferable, and the composition ratio of the monoalkyl salicylic acid metal salt is 85 to 100 m o 1%, and the composition of the dialkyl salicylic acid metal salt. The alkyl salicylic acid metal salt in which the ratio is 0 to 15 mo 1% and the composition ratio of the 3_alkyl salicylic acid metal salt is 40 to 100 mo 1%, and / or its (over) basic salt This is preferable because the anti-shudder life can be further improved.

The monoalkyl salicylic acid metal salt as used herein means an alkyl salicylic acid metal salt having one alkyl group such as 3_alkyl salicylic acid metal salt, 4 mono-alkyl salicylic acid metal salt, 5-alkyl salicylic acid metal salt, and the like. The composition ratio of the salt is 85 to 100 mo 1%, preferably 88 to 98 mo 1%, more preferably 90 to 95 mo 1% with respect to 100mo 1% of the alkyl salicylic acid metal salt. The constituent ratio of the metal salt of an alkyl salicylic acid other than a salt, for example, a metal salt of a dialkyl salicylic acid, is 0 to 15 mo 1%, preferably 2 to 12 mol%, more preferably 5 to 10 mol 1%. Also 3-alkyl The constituent ratio of the metal salicylic acid salt is 40 1 00 mo 1%, preferably 45 to 80 mol%, more preferably 50 to 60 mol% with respect to 1% of the alkyl salicylic acid metal salt 1 O Omo. The total composition ratio of the 4-alkyl salicylic acid metal salt and the 5-alkyl salicylic acid metal salt is obtained by excluding the above-mentioned 3-alkyl salicylic acid metal salt and dialkyl salicylic acid metal salt with respect to 100 mol 1% of the alkyl salicylic acid metal salt. The ratio corresponds to 0 to 6 Omo 1%, preferably 20 to 5 Omo 1%, more preferably 30 to 45 mo 1%. By containing a small amount of a metal salt of dialkyl salicylic acid, it is possible to obtain a composition that achieves both anti-wear properties and low-temperature properties. By making the composition ratio of 3-alkylsalicyle at least 4% Omo, The composition ratio of the alkyl salicylate metal salt can be relatively lowered, and the oil solubility can be improved.

The alkyl group in the alkyl salicylic acid metal salt constituting the component (A2) has 10 to 40 carbon atoms, preferably 10 to 19 carbon atoms or 20 to 30 carbon atoms, and more preferably carbon atoms. An alkyl group having 14 to 18 or 20 to 26 carbon atoms, particularly preferably an alkyl group having 14 to 18 carbon atoms. Examples of the alkyl group having 10 to 40 carbon atoms include a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, a octadecyl group, a nonadecyl group, an icosyl group, a hencosyl group, Examples thereof include an alkyl group having 10 to 40 carbon atoms such as a docosyl group, a tricosyl group, a tetracosinole group, a pentacosinole group, a hexacosinole group, a heptacosyl group, a octacosyl group, a nonacosyl group, and a triacontyl group ^. These alkyl groups may be linear or branched, and may be a primary alkyl group or a secondary alkyl group. In the present invention, the salicylic acid metal salt satisfying the definition of the component (A2) A secondary alkyl group is particularly preferred in that it is easy to obtain.

Examples of the metal in the alkyl salicylic acid metal salt include alkali metals such as sodium and rhodium, alkaline earth metals such as calcium and magnesium, and are preferably calcium and magnesium, and particularly calcium. preferable.

The component (A 2) of the present invention can be produced by a known method, and is not particularly limited. For example, 1 mol 1 or more of ethylene, 1 mol 1 of phenol, Polymerization such as propylene and butene or copolymers such as copolymers with 10 to 40 carbon atoms, preferably linear α-olefins such as ethylene polymers, and carboxylated with carbon dioxide or the like Alkyl salicylic acid mainly composed of monoalkyl salicylic acid obtained by a method, or a method of alkylating with 1 mo 1 or more of such olefins, preferably linear α-olefins, to 1 mo 1 of salicylic acid In addition, it is allowed to react with a metal base such as an oxide or hydroxide of an alkali metal or alkaline earth metal, or an alkali metal salt such as a sodium salt or an alkaline salt, or an alkali metal salt. It can be obtained by substituting with an alkaline earth metal salt. Here, the reaction ratio of phenol or salicylic acid and olefin is preferably controlled to, for example, 1: 1 to: I.15 (molar ratio), more preferably, 1: 1.05 to 1.1 (molar ratio). Thus, the composition ratio of the monoalkyl salicylic acid metal salt and the dialkyl salicylic acid metal salt can be controlled to a desired ratio, and by using a linear α-olefin as the olefin, a 3-alkyl salicylic acid metal It is easy to control the constituent ratio of the salt, 5-alkylsalicylic acid metal salt, etc. to a desired ratio as in the component (Α2) specified in the present application, and the alkylsalicylic acid metal salt having a secondary alkyl preferred in the present invention is mainly used. Especially preferred because it can be obtained as an ingredient. When branched olefins are used as olefins, it is easy to obtain only 5-alkylsalicylic acid metal salts. However, oils can be obtained by mixing 3-alkylsalicylic acid metal salts, etc., so as to constitute the component (Α2). This is an undesirable method because it requires improved solubility and the manufacturing process is diversified.

The component (Α2) of the present invention includes an alkali metal or alkaline earth metal salicylate (neutral salt) obtained as described above, an excess of an alkaline metal or alkaline earth metal salt, A basic salt obtained by heating a metal or an alkaline earth metal base (a hydroxide or oxide of an alkaline earth metal or an alkaline earth metal) in the presence of water, carbon dioxide gas or boron Also included are overbased salts obtained by reacting the above neutral salts with bases such as hydroxides of alkaline metals or alkaline metals in the presence of acids or borates.

These reactions are usually carried out in a solvent (an aliphatic hydrocarbon solvent such as hexane, an aromatic hydrocarbon solvent such as xylene, a light lubricating base oil, etc.), and the metal content thereof is 1. It is desirable to use 0 to 20% by mass, preferably 2.0 to 16% by mass. That's right.

The most preferable component (A 2) in the present invention is that the composition ratio of the monoalkyl salicylic acid metal salt is 85 to 95 mo 1%, and the composition ratio of the dialkyl salicylic acid metal salt is that the initial shudder prevention performance is excellent. 5 to 15 mo 1%, 3-alkylsalicylic acid metal salt is 50 to 6 Omo 1%, 4 alkylsalicylic acid metal salt and 5-alkylsalicylic acid metal salt is 35 to 45 mo 1% A metal salt of an alkyl salicylic acid, and Z or a (per) basic salt thereof. The alkyl group here is particularly preferably a secondary alkyl group.

In the present invention, the base number of the component (A2) is usually 0 to 50 Omg KOH g, preferably 20 to 300 mg KOH g, particularly preferably 100 to 200 mg KO HZ g. One or two or more selected from the above can be used in combination. The base number here means the base number by the perchloric acid method measured according to 7. of J. ISK 2501 “Petroleum products and lubricating oil mono-neutralization test method”. In the lubricating oil composition of the present invention, the content of the component (A2) is as follows. When the component (A1) is not used in combination, the amount of metal (Me B) based on the total amount of the composition is as follows: 0 1 to 0.4 Mass. / ₀ , preferably 0.0 1 to 0.3% by mass, more preferably 0.02 to 0.2% by mass, and still more preferably 0.04 to 0.15% by mass, and the component (A 1) When used in combination, the content of the component (A2) is preferably 0.001 to 0.1% by mass, more preferably 0.005 to 0.08% by mass, and particularly preferably 0.01 to 0. 04 Mass%.

In addition, the total content of these (A 1) component and Z or (A2) component is 0.01 to 0.4 mass% as a metal amount based on the total amount of the composition, preferably 0.0 1 ˜0.3% by mass, more preferably 0.02˜0.2% by mass, particularly preferably 0.04˜0.15% by mass. By using both the (A 1) component and the (A2) component, the anti-shudder life can be extended while maintaining a high coefficient of friction between metals. In the lubricating oil composition of the present invention, the mass ratio ((Me B) Z (Me A)) of the content of the component (A 1) and the component (A 2) is not particularly limited, but exceeds 0 or 0. 1. Preferably 5 or less.

When (A 1) component and (A2) component are used in combination, (Me B) / (Me A) is preferably 0.0 1 to 1.5, more preferably 0.05 to 1.4. And more Preferably it is 0.1 to 1, particularly preferably 0.2 to 0.5. The combined use of the (A 1) and (A 2) components can improve the anti-shudder life compared to when they are used alone, and maintain high levels of transmission torque capacity and transmission characteristics even in wet clutches. can do.

In the lubricating oil composition of the present invention, (B) the friction modifier must contain (B 1) a fatty acid metal salt.

(B 1) The fatty acid in the fatty acid metal salt may be a linear fatty acid or a branched fatty acid, and may be a saturated fatty acid or an unsaturated fatty acid, but if the number of carbons in the alkyl group or alkenyl group is 6 to 30, Preferably, 9 to 24 is desirable. If the alkyl group or alkenyl group of the fatty acid has less than 6 carbon atoms or more than 30 carbon atoms, the friction characteristics of the wet clutch are deteriorated.

Specific examples of the fatty acid include heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, Saturated fatty acids such as nonadecanoic acid, icosanoic acid, henocosanoic acid, docosanoic acid, tricosanoic acid, tetracosanoic acid, pentacosanoic acid, hexacosanoic acid, heptacosanoic acid, octacosanoic acid, nonacosanoic acid, triaconylic acid, etc. May be branched.); Heptenoic acid, octenoic acid, nonenic acid, decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid, tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, heptadecenoic acid, octadecenoic acid, nonadecene Acid, isenoic acid, f Unsaturated fatty acids such as icosenoic acid, docosenoic acid, tricosenoic acid, tetracosenoic acid, pentacosenoic acid, hexacosenoic acid, heptacosenoic acid, octacosenoic acid, nonacosenic acid, triacontenoic acid (these unsaturated fatty acids may be linear or branched) The position of the double bond is also arbitrary.);, Etc., but particularly from the point that it is more excellent in the friction characteristics of the wet clutch, from lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, various fats and oils A linear fatty acid such as a linear fatty acid that is derived (coconut oil fatty acid, etc.) or a mixture of a linear fatty acid and a branched fatty acid synthesized by an oxo method or the like is preferably used. Specific examples of the component (B 1) include the alkaline earth metal salts (magnesium salts, calcium salts, etc.) and zinc salts of the above fatty acids. More specifically, the friction coefficient between metals is kept high, and the friction characteristics between metals and anti-shudder properties are well balanced. From the viewpoint that can be improved, calcium laurate, calcium myristate, no. Calcium luminate, calcium stearate, calcium oleate, coconut oil fatty acid calcium, synthetic mixed fatty acid calcium having 12 to 13 carbon atoms, zinc laurate, zinc myristate, zinc palmitate, zinc stearate, oleic acid Particularly preferred are zinc, coconut oil fatty acid zinc, synthetic mixed fatty acid zinc having 12 to 13 carbon atoms, and mixtures thereof.

The content of (B 1) component in the present invention, the total amount of the composition is zero. 0 1-5 mass%, preferably 0.0 5-1 mass ^_0/0, and particularly preferably 0.0 5 to 0.5 mass. / ₀ . By making the (B 1) component within the above range, the anti-shudder life can be significantly improved, and the metal-to-metal / i-V characteristics can be improved and scratch noise can be prevented while maintaining a high coefficient of friction between metals. be able to. In addition, when the amount of (B 1) component increases, the coefficient of friction between metals tends to decrease. In order to express the above properties in a well-balanced manner, the content of (B 1) component should be 0.3% by mass or less. Is particularly preferred.

In the lubricating oil composition of the present invention, it is preferable to further use a friction modifier other than the component (B 1) as (B) a friction modifier. As the friction modifier other than the component (B 1), any compound other than the component (B 1) that is usually used as a friction modifier for lubricating oil can be used, but an alkyl group having 6 to 30 carbon atoms. Or at least one alkenyl group, especially a straight-chain alkyl group or straight-chain alkenyl group having 6 to 30 carbon atoms, amine-based friction modifier, imide-based friction modifier, amide-based friction modifier Agents, fatty acid ester friction modifiers, and the like.

Examples of the amine-based friction modifier include linear or branched carbon atoms having 6 to 30 carbon atoms, preferably linear aliphatic monoamines, linear or branched carbon atoms having 6 to 30 carbon atoms, and preferably Preferably, aliphatic amine rubs such as linear aliphatic alkanolamines, linear or branched, preferably linear aliphatic polyamines, or alkylene oxide adducts of these aliphatic amines. Examples thereof include regulators.

The imid friction modifier has one or two linear or branched, preferably branched hydrocarbon groups having 6 to 30 carbon atoms, preferably 8 to 18 carbon atoms. Mono and Z or psuccinic acid imide, and one or more selected from boric acid, phosphoric acid, a carboxylic acid having 1 to 20 carbon atoms, or a sulfur-containing compound. Examples thereof include succinic acid-based friction modifiers such as succinic acid-modified compounds that are reacted with.

Examples of the amide friction modifier include straight-chain or branched, preferably straight-chain alkyl or alkenyl fatty acids having 6 to 30 carbon atoms, ammonia, aliphatic monoamines or aliphatic polyamines. Examples thereof include fatty acid amide type friction preparation agents such as amides.

Examples of the fatty acid friction modifier include linear or branched, preferably fatty acid having a linear alkyl group or alkenyl group having 6 to 30 carbon atoms, the fatty acid and an aliphatic monovalent alcohol or aliphatic. And fatty acid esters such as esters with polyvalent T-col.

In the present invention, the friction modifier other than the component (B 1) can be blended with one or more selected from the above, and its content is based on the total amount of the composition, 0 0.1 to 5% by mass, preferably 0.5 to 1% by mass, and particularly preferably 0.05 to 0.5% by mass.

In the present invention, as the friction modifier other than the component (B 1), it is particularly preferable to use the (B 2) alcohol-based friction modifier among the above. By using both the (B 1) component and the (B 2) component together, it is possible to improve the anti-shudder life, the friction coefficient between metals, and the μ-V characteristics between metals in a well-balanced manner.

(Β2) Specific examples of the alkanolamine friction modifier include aliphatic alkanols having a linear or branched, preferably linear, alkyl or alkenyl group having 6 to 30 carbon atoms. More specifically, hexyldiethanolamine, heptyljetanolamine, octyljetanolamine, nonyljetanolamine, decyljetanolamine, undecyljetano 1 Lumine, Dodecyl Jetanol, Tridecyl Jetanol, Tetradecyl Jetanol, Pentadecyl Jetanol, Hexadecyl Diethanolamine, Heptadecyl Jetanol, Octadecyl Jetanolamine Straight chain or branched alkyl having 6 to 30 carbon atoms, preferably 12 to 18 carbon atoms. A saturated aliphatic alkanolamine having a group and an alkyl group having 1 to 10 carbon atoms, preferably 1 to 4 carbon atoms, more preferably 2 carbon atoms; hexenyljetanolamine, heptuldiethanolamine, octene Two Rugetano Luamine, Nonenyljetanolamine, Decenyljetanolamine, Undesenyljetanolamine, Dodecenyljetanolamine, Tridecenyljetanolamine, Tetradedecyljetanolamine, Pentadecenyljetanolamine, Hexadecenylger A straight-chain or branched alkenyl group having 6 to 30 carbon atoms, preferably 12 to 18 carbon atoms, such as tananolamine, heptadecenyljetanolamine, octadeceni, lugetanolamine, and the like; An unsaturated aliphatic alkanolamine having an alkyl group having 10 to 10 carbon atoms, preferably 1 to 4 carbon atoms, and more preferably 2 carbon atoms can be mentioned. Of these, lauryldiethanolamine, dodecyldipropanolamine, and oleyljetanolamine are particularly preferable.

The content of the component (B 2) is preferably from 0.1 to 5% by mass, more preferably from 0.5 to 1% by mass, and particularly preferably from 0.01 to 5% by mass, based on the total amount of the lubricating oil composition. 5 0.5% by mass.

In addition, when the (B 1) component and the (B 2) component are used in combination, the mass ratio is not particularly limited, but the (B 1) component: (B 2) component is preferred because of excellent transmission characteristics. Is 1: 5 to 5: 1, more preferably 1: 3 to 3: 1, and particularly preferably 1: 2 to 2: 1.

The lubricating oil composition of the present invention preferably contains (C) a phosphorus wear inhibitor in order to further increase the coefficient of friction between metals.

The phosphorus-based antiwear agent is not particularly limited as long as it contains phosphorus in the molecule. For example, phosphoric monoesters, phosphoric diesters, phosphorous having a hydrocarbon group having 1 to 30 carbon atoms. Acid triesters, phosphorous acid monoesters, phosphorous acid diesters, phosphorous acid triesters, thiophosphoric acid monoesters, thiophosphoric acid diesters, thiophosphoric acid triesters, thiophosphoric acid monoesters Thiophosphorous diesters, thiophosphite triesters, salts of these esters with amines or alkanolamines, metal salts such as zinc salts, and the like can be used. Specific examples of the hydrocarbon group having 1 to 30 carbon atoms include an alkyl group, a cycloalkyl group, an alkenyl group, an alkyl-substituted alkyl group, an aryl group, an alkyl-substituted aryl group, and an aryl alkyl group. 1 type or 2 types or more can be arbitrarily blended. The content of the phosphorus-based antiwear agent in the lubricating oil composition of the present invention is usually from 0.001 to 5 mass ⁰ / based on the total amount of the composition. Although, as the phosphorus element concentration, preferably 0.0 0 1 to 0.1% by weight, more preferably 0.005 to 0.08 wt%, further preferred properly is 0.0 1 to 0.06 mass ⁰ / _0, particularly preferably 0.02 to 0.05 mass ^_0/0. By setting the content of the phosphorus-based antiwear agent in the above range, it is possible to obtain a composition that is excellent in antiwear property and initial anti-shudder performance and can easily maintain anti-shudder performance for a long period of time.

In the present invention, among the above (C) phosphorus-based antiwear agents, (C1) has an alkyl group having a carbon number of 17 or less, preferably 4 to 8 carbon atoms, more preferably 4 to 6 carbon atoms. Preferably, it contains an alkyl phosphate, more preferably one or more selected from monobutyl phosphate, dibutyl phosphate and tributyl phosphate, and most preferably dibutyl phosphate . Alkyl phosphates with an alkyl group carbon number of 17 or less, especially alkyl phosphates with a short alkyl chain length, such as dibutyl phosphate, provide excellent μ-V characteristics between metals and prevent scratch noise. As a result, a lubricating oil composition having a higher coefficient of friction between metals and a higher torque transmission capability can be obtained as compared with the case of using an alkyl phosphate having an alkyl group having 18 or more carbon atoms.

Further, in the present invention, (C 2) 6 to 12 carbon atoms, preferably 6 to 8 carbon atoms (alkyl) in that the friction coefficient between metals can be further increased and the torque transmission capability can be increased. More preferably, the aryl group contains an aryl phosphite (an alkyl group is an alkyl group having 1 to 6, preferably 1 to 2 carbon atoms). Specific examples of the (alkyl) aryl phosphate include monophenyl phosphite, diphenyl phosphite, triphenyl phosphite, monocresino phosphite, dicresyl phosphite, tricresyl phosphite, etc. 1 or 2 or more selected from these are more preferable, and diphenyl phosphate is most preferable.

In addition, it is preferable to use both (C 2) component and (Β 1) component in terms of further improving the anti-shudder life, (C 2) component, (B 1) component and (Β 2) component. It is more preferable to use together.

In addition, when (C 2) component alone is used, the balance between (Α) component and (Β) component Z-V characteristics also tend to deteriorate, so it is superior to the μ-V characteristics between metals and can be used in combination with the (C 1) component and (C 2) component in that the friction coefficient between metals can be further increased. It is particularly preferable to do this.

Therefore, in the present invention, it is possible to optimize all of the improvement of scratch noise prevention, the prevention of shudder life and the improvement of the coefficient of friction between metals in terms of balance. Or (C 2) component, (B 1). And (Β 2) component are particularly preferably used in combination.

In the present invention, the content when the component (C 1) is used is 0'.00 1 to 0.1% by mass, preferably 0.0 1 to 0.05% by mass based on the total amount of the composition. %, More preferably 0.02 to 0.03 mass%, and the content when using the component (C 2) is 0.001 to 0 .. 1 in terms of phosphorus based on the total amount of the composition. mass%, the preferred properly 0.005 to 0.05 mass ^_0/0, still more preferably from 0 1 to 0.02 wt% 0., when used in combination (C 1) component and (C 2) component The content ratio is preferably as follows: Phosphorus element ratio (mass ratio): 1: 0.1 to 5: 1, more preferably 1: 0 .. 3 to 1: 1, more preferably 1: 0.5 to 5: 1: 0.8.

In addition, in the lubricating oil composition of the present invention, when (C) a phosphorus-based antiwear agent is contained, the content of (A 1) in the metal element concentration of the component (A 1) relative to the content (元素) in the phosphorus element concentration The mass ratio of the amount (Me A) ((Me A) / (P)) is not particularly limited and is usually 250 or less, preferably 0.1 to 250, more preferably 0.5 to 50, More preferably, it is 0.8-5, and particularly preferably 1-3. (C) By making the mass ratio of the component (A 1) to the content (P) in the phosphorus element concentration of the component within the above range, the wear resistance and the initial shudder prevention performance are excellent, and the shudder prevention performance It is possible to obtain a composition that can be easily maintained for a long time.

According to the lubricating oil composition of the present invention, a lubricating oil composition having a good balance between improvement in scratch noise prevention, improvement in inter-metal friction coefficient and anti-shudder performance can be obtained with the above-described configuration. For the purpose of enhancing, or for the purpose of further imparting the necessary performance as a lubricating oil composition, known lubricating oil additives can be added. Additives that can be added include, for example, ashless dispersants, metallic detergents other than (A 1) component and (A2) component, antioxidants, extreme pressure additives, viscosity index improvers, metal deactivators Anti-tacking agents, corrosion inhibitors, pour point depressants, rubber swelling agents, antifoaming agents, colorants, etc. I can make it. These can be used alone or in combination.

As the ashless dispersant, any compound usually used as an ashless dispersant for lubricating oil can be used. For example, nitrogen-containing compounds such as succinic acid, benzylamine, and polyamine having at least one alkyl group or alkenyl group having 40 to 40, preferably 60 to 35, carbon atoms in the molecule, or Examples thereof include derivatives or modified products thereof. The alkyl group or alkenyl group having 40 to 400 carbon atoms may be linear or branched. Specifically, preferred are olefin oligomers such as propylene, 1-ptene and isobutylene. And branched alkyl groups and branched alkenyl groups derived from ethylene and propylene copolymers. If the alkyl group or alkenyl group has less than 40 carbon atoms, the solubility of the compound in the lubricating base oil will be reduced, whereas if the alkyl group or alkenyl group has more than 400 carbon atoms, The low temperature fluidity of the composition deteriorates.

Examples of the derivative or modified product of the nitrogen-containing compound mentioned as an example of the above ashless dispersant include, for example, the above-mentioned nitrogen-containing compounds, monocarboxylic acids having 2 to 30 carbon atoms (fatty acids, etc.), Shu By reacting polycarboxylic acids having 2 to 30 carbon atoms such as acid, phthalic acid, trimellitic acid and pyromellitic acid to neutralize some or all of the remaining amino groups and Z or imino groups An amidated so-called acid-modified compound; a boron compound such as boric acid or borate is allowed to act on the nitrogen-containing compound as described above, and a part or all of the remaining amino groups and Z or imino groups A so-called boron-modified compound that has been neutralized or amidated; phosphoric acid or phosphorous acid is allowed to act on the nitrogen-containing compound as described above, and a part or all of the remaining amino groups and Z or imino groups are removed. Neutralized A so-called phosphorus-modified compound; a sulfur-modified compound obtained by allowing a sulfur compound to act on a nitrogen-containing compound as described above; and an acid-modified, boron-modified, phosphorous-modified sulfur containing a nitrogen-containing compound as described above. Examples thereof include modified compounds in which two or more kinds of modifications selected from modification are combined.

In the lubricating oil composition of the present invention, one or two or more compounds arbitrarily selected from these can be used in an arbitrary ratio.

The lubricating oil composition of the present invention preferably contains these ashless dispersants, and is expected to improve the transmission torque capacity in wet clutches and the coefficient of friction between metals. It is preferable to contain a non-boron succinic acid ashless dispersant, because it can. It is also possible to use boron-containing succinic acid ash-based ashless dispersant because it can be expected to improve transmission torque capacity, transmission characteristics, and friction coefficient between metals when used in combination with component (A 1). Useful.

The content of the ashless dispersant of the lubricant based on the total amount of the composition, preferably from 0.1 to 1 0 mass ^_0/0, more preferably 1-6 wt%, typically 0.1 .005～ as nitrogen content It is 0.4% by mass, preferably 0.01 to 0.2% by mass, particularly preferably 0.02 to 0.15% by mass. Further, when the boron-containing succinic acid imide ashless dispersant is used, the content of the total amount of the composition is 0.001 to 0.1% by mass, preferably 0.00. 00 5 to 0.08 mass ^_0/0, more preferably 0.0:! ˜0.05% by mass, particularly preferably 0.01 5 to 0.025% by mass.

Examples of metallic detergents other than the components (A 1) and (A2) include phenate detergents.

Specific examples of the phenate detergent include reacting sulfur with an alkylphenol having at least one linear or branched alkyl group having 4 to 30 carbon atoms, and preferably 6 to 18 carbon atoms. Alkyl phenol sulfide obtained by reacting this alkynole phenol with formaldehyde to produce a Mannich reaction product of alkyl phenol, especially an alkaline earth metal salt, especially magnesium salt or calcium salt, etc. Preferably used.

The base number of metallic detergents other than these (A1) component and (A2) component is usually 0 to 500 mg KOH / g, preferably 20 to 450 mg KOH / g.

In the lubricating oil composition of the present invention, when a metal-based cleaning agent other than the components (A 1) and (A2) is included, the content is not particularly limited, but is usually 0.0 on the basis of the total amount of the composition. 1-5 mass ⁰ /. , And the preferably 0.05 to 1% by weight, particularly preferably 0.5:! There Nde ~ 0.5 mass ^0.

Antioxidants that can be used are those generally used in lubricating oils, such as funinol compounds and amine compounds.

Specifically, alkylphenols such as 2-6-di-tert-butyl-4-methylphenol, methylene-1,4-bisphenol (2,6-ditert. Bisphenols such as 1-butyl-1,4-methylphenol), naphthylamines such as phenol-α-naphthylamine, dialkyldiphenylamines, (3,5-di-tert-butyl-4-hydroxyphenyl) fatty acid (Propionic acid, etc.) and mono- or polyhydric alcohols such as methanol, octadecanol, 1,6-hexadiol, neopentylglycolanol, thiodiethylene glycol, triethylene glycol, pentaerythritol, etc., phenothiazine And organometallic antioxidants such as molybdenum, copper and zinc, and mixtures thereof.

In the present invention, one kind or two or more kinds of compounds arbitrarily selected from these can be contained in any amount, but usually the content is 0.001 based on the total amount of the lubricating oil composition. -5.0 mass%.

In the present invention, it is preferable to use phenolic antioxidants and Z or amine-based antioxidants. In particular, phenolic antioxidants and amine-based antioxidants are easy to maintain the anti-shudder performance for a longer period of time. It is preferable to use an antioxidant together. The mass ratio when the funinol-based antioxidant and the amine-based antioxidant are used in combination is preferably 1: 5 to 10: 1, more preferably 1 ::! To 8: 1, and even more preferably 2 :: ! ~ 6: 1.

As the extreme pressure additive, any compound usually used as an extreme pressure additive for lubricating oils can be used. For example, dithiocarbamates, disulfides, sulfurized olefins, sulfurized oils and fats, etc. A sulfur type compound etc. are mentioned. In the present invention, one or two or more compounds arbitrarily selected from these can be contained in any amount, but usually the content is 0.0 on the basis of the total amount of the lubricating oil composition: ! ~ 5.0% by mass.

As the viscosity index improver, specifically, a so-called non-dispersion type viscosity index improver such as a copolymer of one or more monomers selected from various methacrylic acid esters or a hydrogenated product thereof, or further Examples thereof include a so-called dispersion type viscosity index improver obtained by copolymerizing various methacrylic acid esters containing a nitrogen compound. Specific examples of other viscosity index improvers include non-dispersed or dispersed ethylene mono-alpha-olefin copolymers.

(Examples of ct-olefin include propylene, 1-butene, 1-pentene, etc.) Or a hydride thereof, polyisobutylene or a hydrogenated product thereof, styrene-gen water Examples thereof include an elementary copolymer, a styrene monomaleic anhydride ester copolymer, and a polyalkylstyrene.

The molecular weight of these viscosity index improvers must be selected in consideration of shear stability. Specifically, the number average molecular weight of the viscosity index improver is, for example, 5000 to 150000, preferably 5000 to 35000 in the case of dispersed and non-dispersed polymethacrylates, polyisobutylene or a hydride thereof. In the case of 800 to 5000, preferably 1 000 to 4000, in the case of ethylene-α-olefin copolymer or its hydride, 800 to 150,000, preferably 3000 to: I 2000 is preferred.ヽ.

In the present invention, one or two or more compounds arbitrarily selected from these viscosity index improvers can be contained in any amount, but the content thereof is usually a lubricating oil. It is 0.:!~20.0% by mass on the basis of the composition.

Examples of metal deactivators include thiazole compounds and thiadiazole compounds, and thiadiazole compounds are preferably used. The thiadiazole compound includes 2,5-bis (alkylthio) 1, 1,3,4-thiadiazole having a straight chain or branched alkyl group having 6 to 24 carbon atoms, a straight chain or branched chain having 6 to 24 carbon atoms. 2,5-bis (alkyldithio) -1, 3,4-thiadiazole having a branched alkyl group, 2_ (alkylthio) 1-5-mercapto 1 having a linear or branched alkyl group having 6 to 24 carbon atoms 1, 3, 4-thiadiazole, having a straight chain or branched alkyl group having 6 to 24 carbon atoms, 2_ (alkyldithio) 1-5_mercapto 1, 3,3,4-thiadiazole and mixtures thereof Can be mentioned. Among these, 2,5-bis (alkyldithio) 1 1,3,4-thiadiazole is particularly preferable. The content of these metal deactivators is 0.005 to 0.5% by mass based on the total amount of the composition. Examples of the anti-tacking agent include alkenyl succinic acid, alkenyl succinic acid ester, polyvalent alcoholol ester, petroleum sulfonate, dinonylnaphthalene sulfonate and the like.

Examples of the corrosion inhibitor include benzotriazole, tolyltriazole, and imidazole compounds.

Examples of the pour point depressant include polymetatalate polymers that are compatible with the lubricating base oil used. Examples of rubber swelling agents include aromatic and ester rubber swelling agents. Examples of the antifoaming agent include silicones such as dimethyl silicone and fluorosilicone.

The content of these additives is arbitrary, but the content of the corrosion inhibitor is usually from 0.005 to 0.2% by mass, and the content of the antifoaming agent is from 0.0005 to 0.00, based on the total amount of the composition. The content of 0% by mass and other additives is about 0.005 to 10% by mass, respectively.

The kinematic viscosity of the lubricating oil composition of the present invention at 100 ° C. is usually 2 to 25 mm ² / s, preferably 3 to 15 mm ² / s, more preferably 4 to 10 mm ² Z s, more preferably It is preferably 5 to 7 mm ² / s.

The lubricating oil composition of the present invention is a continuously variable transmission having a slip type wet clutch such as a belt type C VT and a start clutch, which has excellent scratch noise prevention, inter-metal friction coefficient and shudder prevention performance. The lubricating oil composition is particularly suitable for use in an automobile, and is also suitable for a lubricating oil composition for an automatic transmission because it can be expected to improve the anti-shudder life.

The lubricating oil composition of the present invention is also excellent in performance as a transmission oil other than the above, and is used for automatic transmissions such as automobiles, construction machines, and agricultural machines, manual transmissions, and differential gears. It is also preferably used as an oil. Also suitable for industrial gear oil, automobiles such as motorcycles and automobiles, gas engines for power generation and marine use, diesel engines, lubricating oils for gas engines, turbine oils, compressor oils, etc. Can be used.

[Industrial applicability]

The lubricating oil composition of the present invention is suitably used as a lubricating oil composition for automatic transmissions and / or continuously variable transmissions.

[Example]

Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these.

(Examples 1 to 3 and Comparative Examples 1 to 6) Lubricating oil compositions shown in Examples 1 to 3 in Table 1 (in addition, a viscosity index improver was prepared as an additive so that the kinematic viscosity of the composition was 10 mm ² / s) and comparison Therefore, each lubricating oil composition shown in Comparative Examples 1 to 6 was prepared, and the following (1) Intermetallic friction characteristics (μ-V characteristics), (2) Intermetallic friction coefficient and (3) Anti-shudder life The results are shown in Table 1. The ratio of base oil is based on the total amount of base oil, and the amount of each additive is based on the total amount of composition.

(1) Friction characteristics between metals (u-V characteristics)

Using the Falex Block-on-Ring Test Machine, a friction test is performed under the following conditions, and the friction coefficient is obtained from the friction force measured at a sliding speed of 2 cm / s and 20 cm / s. 0 was calculated. _{If μ} 2 / ^ 2 0 is 1 or less, especially less than 1.0 0/1 V has a positive slope, it was determined that it has excellent scratch noise prevention.

(Test conditions)

Ring: Falex S-10 Test Ring (SAE 4620 Steel)

Block: Falex H-60 Test Block (SAE 01 Steel)

Oil temperature: 60 ° C

Applied load: 90 N

(2) Coefficient of friction between metals

In order to evaluate the friction characteristics between the belt and pulley of a metal belt type continuously variable transmission, the friction test was conducted using the Falex Block-on-Ring Test Machine under the following conditions. From this, the coefficient of friction was determined.

(Test conditions)

Ring: Falex S'10 Test Ring (SAE 4620 Steel)

Block: Falex H-60 Test Block

Oil temperature: 80 ° C

Applied load: 6 60 N

Sliding speed: 50 cm / s

(3) Shatter prevention life

JAS O M3 4 9— 9 8 A low-speed slip test is performed in accordance with “Automatic transmission oil shudder prevention performance test method”, and the life of the reference oil specified in the test method, examples and The sustainability of the shudder prevention performance was evaluated by the ratio with the life of the comparative example. If the service life is 48 hours or more, it is a general level with excellent anti-shudder life, and if it is 12 O h or more, it is judged that the lubricating oil composition has extremely excellent anti-shudder performance life. . As the friction material, a cellulose-based wet friction material was used. As is clear from the results in Table 1, when the compositions of Examples 1 to 3 according to the present invention were used, the friction characteristics between metals d zZdV indicating a positive index for the anti-scratch noise property showed a positive slope and It can be seen that the friction coefficient can be kept high, the anti-shudder life is long, and it has excellent performance. On the other hand, when any of the components (A) to (B) is not used (Comparative Examples 1 and 2), when the component (B 1) is not used as the component (B) (Comparative Examples 3 to 6), It can be seen that either or all of the metal-to-metal friction coefficient, the metal-to-metal friction characteristic, and the shudder prevention life cannot be achieved at the same time. '

table 1

1) Hydrocracked base oil (100 ° C kinematic viscosity 2.6mm ² / s, viscosity index 105, NOACK evaporation 52 mass <½, S content 0.1 mass% or less)

2) Hydrocracked base oil (100 ° C kinematic viscosity 4.0mm ² / s, viscosity index 125, NOACK evaporation 16 mass, S content 0.1 mass! 4 or less)

3) Calcium sulfonate (base number 300mgKOH g, Ca content: 12.5% by mass)

4) Carbon salicylate of an alkyl salicylic acid Ca salt having a secondary G14 to C18 alkyl group Ca overbasic salt (base number 170 mg KOH / g, Ca content: 6 mass ¹ ½, composition of alkyl salicylic acid Ca salt: 3-alkyl: 53 mol%, 4-alkyl: 4 mol¾, 5-alkyl: 35 mol¾, 3.5-dialkyl: 8 mol¾)

5) Zinc oleate 6) Oleyljetanolamine 7) Amides 8) Imides

9) Dibutyl phosphite (phosphorus content 16.4% by mass) 10) Diphenyl phosphite (phosphorus content: 13.2 mass)

11) Polybutenyl succinimide (nitrogen content: 2.2% by mass) 12) Dialkyldiph I nylamine

13) Bisphenol 14) Polydimethylsiloxane

Claims

The scope of the claims

1. A lubricating oil composition containing (A) a metallic detergent and (B) a friction modifier in a lubricating base oil, and based on the total amount of the composition, (A 1) a sulfonate detergent and Or (A2) containing 0.01 to 0.4 mass% of salicylate detergent as metal, and (B1) 0,0 to 5 mass% of fatty acid metal salt friction modifier. A lubricating oil composition characterized by comprising:

2. The lubricating oil composition according to claim 1, further comprising (B 2) an alkanolamine friction modifier in an amount of 0.01 to 5% by mass based on the total amount of the composition.

3. Further, (C) Phosphorus antiwear agent (C 1) Alkyl phosphite 卜 and alkyl having an alkyl group having a carbon number of 17 or less, or (C 2) (alkyl) Reel phosphate is calculated based on the total amount of the composition.

3. The lubricating oil composition according to claim 1, comprising 1% by mass.

4. The metal content of the component (A 2) (Me B.) / (A 1) The metal content of the component (Me A) is 0 or more than 0 and 1.5 or less. The lubricating oil composition described in 1.

5. The component (A2) has a monoalkyl salicylic acid metal salt composition ratio of 85 to 100 mo 1% and a dialkyl salicylic acid metal salt composition ratio of 0 to 15 mo 1%, and a 3-alkyl salicylic acid metal salt. The lubricating oil composition according to claim 1 or 2, which is an alkyl salicylic acid metal salt having a salt composition ratio of 40 to 10 Omo 1%, and Z or a (per) basic salt thereof.

6. The lubricating oil composition according to claim 1, which is used for an automatic transmission and a Z or continuously variable transmission.

7. The lubricating oil composition according to claim 1, wherein the lubricating oil composition is for a continuously variable transmission having a belt type CVT and a slip control type wet clutch.

8. The lubricating oil composition according to claim 7, wherein the slip control type wet clutch is a starting clutch.