JPH11349968A - Fluid for traction drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject fluid comprising a specific naphthenic ring-contg. hydrocarbon, exhibiting excellent power transmission and the outstanding ability as a fluid for hydraulic pressure control or wet clutch friction control as well, and therefore useful in e.g. automotive stepless speed change gears. SOLUTION: This fluid for traction drive comprises (A) a compound of formula I [R<4> is a (naphthenic ring-contg.) 1-8C alkyl; R<1> to R<3> and R<5> to R<8> are each H or the same as R<4> , and, as necessary, furthermore (B) a mineral oil or a synthetic oil 150-800 in molecular weight, (C) a viscosity index improver [e.g. a (hydrogenated) ethylene-α-olefin copolymer with a number-average molecular weight of 800-150,000], (D) an ash-free dispersant and phosphorus-based additive, (E) a friction regulator having 6-30C alkyl or alkenyl group in the molecule but containing no >=31C hydrocarbon group, and/or (F) a metal-based cleaning agent with a total base value of 20-450 mgKOH/g; by the way, the component A is prepared, for example, by reaction between a compound of formula II and a compound of formula III followed by nuclear hydrogenation of the reaction product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction drive fluid, and more particularly to a traction drive type continuously variable transmission for an automobile, a hydraulic transmission mechanism, a hydraulic control mechanism, and a wet type. The present invention relates to a traction drive fluid that can be used for a friction characteristic control mechanism of a clutch.

[0002]

2. Description of the Related Art Conventionally, in the field of industrial machinery, a traction drive fluid has been used in a traction drive type power transmission device that transmits power via an oil film. In such a device, the traction drive fluid is required to have a high traction coefficient indicating the power transmission capacity. Research and development of traction drive fluids are being pursued for use in continuously variable transmissions for automobiles. When used for automobiles, the traction drive fluid is
It is used not only for a power transmission mechanism but also for a hydraulic control mechanism and a friction characteristic control mechanism of a wet clutch. By the way, automatic transmission oil (hereinafter, ATF) is used as a lubricating oil used for a hydraulic control mechanism and a friction control mechanism of a wet clutch as a transmission for an automobile. A
It is a well-known fact that TF is required to have a certain high kinematic viscosity at high temperature and to have excellent low-temperature fluidity in order to fulfill its role as a hydraulic control mechanism. . In addition, in order to fulfill the role of a friction characteristic control mechanism of a wet clutch, particularly a control mechanism with a slip control mechanism added, the ATF is compounded with an additive having excellent friction characteristics, especially excellent anti-shudder characteristics. Is also a well-known fact. Therefore, when the traction drive fluid is used in a traction drive type continuously variable transmission for an automobile, the traction drive fluid is required not only for the power transmission capability originally excellent in performance but also for the ATF. A capacity as a hydraulic control fluid and a capacity as a friction control fluid of a wet clutch are required. But,
Commercially available traction drive fluids include:
There is a "Santo truck", which is widely known for its excellent power transmission capacity.However, when used in a continuously variable transmission for automobiles, it must meet the fluidity at low temperatures and other performances. At present, fluids for traction drives for automobiles have not yet been commercialized. Accordingly, the present invention has been made in view of such circumstances, and its purpose is to not only excel in power transmission capability, but also as a hydraulic control fluid performance and a wet clutch friction control fluid. Another object of the present invention is to provide a traction drive fluid having excellent capability.

[0003]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, they have been used in traction drive fluids, more particularly in traction drive type continuously variable transmissions for automobiles. A traction drive fluid has been developed that is applicable not only to a traction drive fluid, more specifically to a traction drive fluid transmission mechanism, but also to a hydraulic control mechanism and a friction characteristic control mechanism of a wet clutch. That is, the traction drive fluid of the present invention comprises a naphthenic ring-containing hydrocarbon represented by the following general formula (1).

Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and the others independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. (It may contain a naphthene ring.) The traction drive fluid of the present invention is composed of a naphthene ring-containing hydrocarbon represented by the following general formula (2).

Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ¹ , R ² ,
^{R 3, R 5, R 6} , R 7 and R ⁸ each represent independently hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may have a naphthene ring), ^{and, R 1, R 3, R} 6 And at least one arbitrarily selected from R ⁸ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring). )

Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ¹ , R ² ,
R ³ , R ⁵ , R ⁶ , R ⁷ and R ⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), and R ¹ , R ² , R ³ , R ⁶ , R ⁷ and R ⁸
At least one arbitrarily selected from represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring). Further, the traction drive fluid of the present invention comprises the naphthenic ring-containing hydrocarbon, mineral oil and a molecular weight of 150-8.
And at least one selected from synthetic oil No. 00.

It is preferable to add a viscosity index improver to the traction drive fluid. It is preferable that the viscosity index improver is an ethylene-α-olefin copolymer having a number average molecular weight of more than 800 and not more than 150,000 or a hydride thereof. Further, it is preferable to mix an ashless dispersant and a phosphorus-based additive with the traction drive fluid. Further, a friction modifier containing at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and containing no hydrocarbon group having 31 or more carbon atoms in the molecule is blended with the traction drive fluid. Is preferred. Furthermore, it is preferable to mix a metal-based detergent having a total base number of 20 to 450 mgKOH / g to the traction drive fluid.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail. The fluid for traction drive of the present invention is:
It comprises a naphthene ring-containing hydrocarbon represented by the following general formula (1).

Embedded image In the formula (1), among R ^{1 to} R ⁸ , R ⁴ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably 1
To 4 alkyl groups, more preferably a methyl group.
The others are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. Among the naphthene ring-containing hydrocarbons represented by the general formula (1), preferred are compounds having a particularly high traction coefficient, such as compounds represented by the following general formula (2).

Embedded image In the formula (2), among R ^{1 to} R ⁸ , R ⁴ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group. It is. R ¹ , R ² , R ³ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably a hydrogen atom or a carbon atom; An alkyl group of Formulas 1 to 4, more preferably a hydrogen atom or a methyl group, and at least one, preferably at least two or more, more preferably any one selected from R ¹ , R ³ , R ⁶ and R ⁸ In the formula, at least R ¹ and R ⁶ are an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group. Further, among the naphthene ring-containing hydrocarbons represented by the general formula (1), compounds which are particularly preferable in terms of particularly excellent low-temperature viscosity characteristics include compounds represented by the following general formula (3).

Embedded image In the formula (3), among R ^{1 to} R ⁸ , R ⁴ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group. It is. R ¹ , R ² , R ³ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably a hydrogen atom or a carbon atom; An alkyl group of formulas ^{1 to} 4, more preferably a hydrogen atom or a methyl group, and at least one arbitrarily selected from R ¹ , R ² , R ³ , R ⁶ , R ⁷ and R ⁸ has 1 carbon atom ~
An alkyl group of 8 (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group. Further, among the naphthene ring-containing hydrocarbons represented by the general formula (3), the hydrocarbon has excellent low-temperature viscosity characteristics,
In addition, in view of showing a high traction coefficient, R ¹ to
Among R ⁸ , R ⁴ is an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, and R ¹ , R ² , R
³ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms More preferably a hydrogen atom or a methyl group, and at least one arbitrarily selected from R ¹ , R ³ , R ⁶ and R ⁸ having 1 to 8 carbon atoms (may include a naphthene ring); It is more preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group. In formulas (1), (2) and (3), examples of the alkyl group representing R ^{1 to} R ⁸ include a methyl group, an ethyl group, and an n group.
-Propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl Group, straight-chain or branched octyl group,
Cyclopentylmethyl, cyclopentylethyl, cyclopentylpropyl, methylcyclopentylmethyl, ethylcyclopentylmethyl, dimethylcyclopentylmethyl, methylcyclopentylethyl, cyclohexylmethyl, cyclohexylethyl, methylcyclohexylmethyl, cycloheptylmethyl, etc. And among these, an alkyl group of 1 to 4 is particularly preferable. When the number of carbon atoms is 9 or more, the low temperature viscosity of the fluid deteriorates, which is not preferable. More specifically, examples of the naphthene ring-containing hydrocarbon include the following compounds. In the compounds, A represents a methylmethylene group or a dimethylmethylene group as described below.

Embedded image (1) Number of alkyl groups added to cyclohexane ring: 0

Embedded image (2) Number of alkyl groups added to cyclohexane ring: 1

Embedded image (3) Number of alkyl groups added to cyclohexane ring: 2

Embedded image

Embedded image (4) Number of alkyl groups added to cyclohexane ring: 3

Embedded image

Embedded image (5) Number of alkyl groups added to cyclohexane ring: 4

Embedded image

Embedded image Among these compounds, preferable ones are (2-1) and (3-) because the traction coefficient is particularly high.
2), (3-3), (3-4), (3-11), (3-
12), (3-13), (4-6), (4-7), (4
-8), (4-10), (4-11), (4-12),
(4-14), (4-15), (4-16), (4-1)
7), (4-21) (5-10), (5-11), (5
-14), (5-15), (5-17) and (5-1)
It is a compound represented by 8). More preferred are:
(3-10), (4-2), (4-3), (4-4),
It is a compound represented by (5-5) and (5-6). Even more preferred are (3-1), (4-5), (4)
-9), (4-13), (5-7), (5-8), (5
-9), (5-12), (5-13) and (5-16)
It is a compound represented by these. Even more preferred are (4-1), (5-2), (5-3) and (5-
It is a compound represented by 4). The most preferred is (5
-1). The method for synthesizing the naphthene ring-containing hydrocarbon represented by the general formula (1) is not particularly limited, and various conventionally known methods can be applied. For example, a synthesis method by the following addition reaction is employed. be able to. (1) Synthesis by addition reaction An aromatic compound represented by the general formula (a)
Sulfuric acid, methanesulfonic acid,
The reaction is carried out at room temperature to 30 ° C. in the presence of an acid catalyst such as clay or a non-aqueous ion exchange resin (Amberlite), and the resulting addition reaction product is reacted in the presence of a metal-based hydrogenation catalyst such as nickel or platinum. By performing nuclear hydrogenation under the conditions of a hydrogen pressure of 30 to 150 atm and a temperature of 100 to 200 ° C., a naphthene ring-containing hydrocarbon represented by the above general formula (1) can be obtained.

Embedded image

Embedded image

[0006] The traction drive fluid of the present invention comprises:
The naphthenic ring-containing hydrocarbon, mineral oil and a molecular weight of 15
It is preferably composed of at least one selected from synthetic oils of 0 to 800, preferably 150 to 500.
As the mineral oil in the present invention, specifically, for example, a lubricating oil fraction obtained by distilling a crude oil under normal pressure and reduced pressure is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, and catalytic dewaxing. Oils such as paraffinic and naphthenic oils and normal paraffins, which are appropriately combined with purification treatments such as hydrorefining, sulfuric acid washing, and clay treatment, can be used. The kinematic viscosity of the mineral oil in the case of using the mineral oil is not particularly limited and is arbitrary.
１００100 mm ² / s, preferably ² to 8 mm ² / s. Synthetic oil used in the present invention,
It is necessary that the molecular weight is 150 to 800, preferably 150 to 500. When the molecular weight is less than 150, evaporation loss increases, and when it exceeds 800, the low-temperature fluidity deteriorates, which is not preferable. Although there is no particular limitation on the synthetic oil, poly-α-olefin (1
-Octene oligomer, 1-decene oligomer, ethylene-propylene oligomer, etc.) and hydrides thereof,
Isobutene oligomer and its hydride, isoparaffin, alkylbenzene, alkylnaphthalene, diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sebacate, etc.), polyol ester (trimethylolpropane capri Rate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, dialkyldiphenyl ether, polyphenyl ether and the like can be used. Among the synthetic oils, isobutene oligomers or hydrides thereof, or synthetic oils represented by the following general formulas (4) to (8) have a particularly high traction coefficient by being blended into a traction drive fluid. It is a particularly preferred synthetic oil because it has a high traction drive fluid that is high, has excellent low-temperature fluidity, has a high-temperature viscosity, and has excellent overall performance.

Embedded image (Wherein R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ ,
R ¹⁶ , R ¹⁷ and R ¹⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms. )

Embedded image (Where R ¹⁹ , R ²⁰ , R ²¹ , R ²² , R ²³ , R ²⁴ , R ²⁵ ,
R ²⁶ , R ²⁷ , R ²⁸ , R ²⁹ and R ³⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably an alkyl group having 1 to 4 carbon atoms. )

Embedded image (Wherein, R ³¹ , R ³² , R ³³ , R ³⁴ , R ³⁵ and R ³⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably 1 to 4 alkyl group). )

Embedded image (Wherein, R ³⁷ , R ³⁸ , R ³⁹ , R ⁴⁰ , R ⁴¹ and R ⁴² each represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably 1 to 4 Represents an alkyl group.)

Embedded image (Wherein R ⁴³ , R ⁴⁴ , R ⁴⁵ , R ⁴⁶ , R ⁴⁷ and R ⁴⁸ are each a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), preferably 1 to 4 In the general formulas (4) to (8), specific examples of the alkyl group represented by R ^{9 to} R ⁴⁸ include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n- Butyl group,
Isobutyl group, sec-butyl group, tert-butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, cyclopentyl Methyl group, cyclopentylethyl group, cyclopentylpropyl group, methylcyclopentylmethyl group, ethylcyclopentylmethyl group, dimethylcyclopentylmethyl group, methylcyclopentylethyl group, cyclohexylmethyl group, cyclohexylethyl group, methylcyclohexylmethyl group, cycloheptylmethyl group, etc. And among these, 1-4 alkyl groups are particularly preferred. The blending ratio of the naphthenic ring-containing hydrocarbon to the mineral oil and / or the synthetic oil is not particularly limited, but is 1:99 to 100: 0, preferably 5:95 to 10.
0: 0 is desirable.

The traction drive fluid of the present invention preferably contains a viscosity index improver. In the present invention, as the viscosity index improver (V component), for example,
A so-called non-polymer such as a copolymer of one or more monomers selected from the compounds (V-1) represented by the following general formulas (9), (10) and (11) or a hydride thereof, A dispersion-type viscosity index improver, or one or more monomers selected from compounds (V-1) and (V-2) compounds represented by formulas (12) and (13) A so-called dispersion type viscosity index improver such as a copolymer with one or more kinds of monomers selected from the group or a hydride thereof is exemplified.

Embedded image (9) In the formula, R ⁴⁹ represents a hydrogen atom or a methyl group, R ⁵⁰
Represents an alkyl group having 1 to 18 carbon atoms.

Embedded image (10) In the formula, R ⁵¹ represents a hydrogen atom or a methyl group;
⁵² represents a hydrocarbon group having 1 to 12 carbon atoms.

Embedded image (11) In the formula, Y ¹ and Y ² are each independently a hydrogen atom or a residue of an alkyl alcohol having 1 to 18 carbon atoms (—O
R ⁵³ : R ⁵³ is an alkyl group having 1 to 18 carbon atoms, or a residue of a monoalkylamine having 1 to 18 carbon atoms (—N
HR ⁵⁴ : R ⁵⁴ represents an alkyl group having 1 to 18 carbon atoms).
Specific examples of the alkyl group having 1 to 18 carbon atoms representing R ⁵⁰ include a methyl group, an ethyl group, an n-propyl group,
Isopropyl group, n-butyl group, isobutyl group, sec
-Butyl group, tert-butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched A nonyl group, a straight or branched decyl group, a straight or branched decyl group, a straight or branched undecyl group, a straight or branched dodecyl group, a straight or branched tridecyl group, A chain or branched tetradecyl group, a linear or branched pentadecyl group,
Examples thereof include a linear or branched hexadecyl group, a linear or branched heptadecyl group, and a linear or branched octadecyl group. Examples of the hydrocarbon group represented by R ^52, and specific examples include a methyl group, an ethyl group, n- propyl group, an isopropyl group, n- butyl group, isobutyl group, sec- butyl group, tert- butyl group, a straight-chain Or a branched pentyl group,
Straight or branched hexyl group, straight or branched heptyl group, straight or branched octyl group, straight or branched nonyl group, straight or branched decyl group, straight or branched chain Alkyl groups such as undecyl group, linear or branched dodecyl group; linear or branched butenyl group, linear or branched pentenyl group, linear or branched hexenyl group, linear or branched Alkenyl such as a heptenyl group, a linear or branched octenyl group, a linear or branched nonenyl group, a linear or branched decenyl group, a linear or branched undecenyl group, a linear or branched dodecenyl group A cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group or a cycloheptyl group; a methylcyclopentyl group, a dimethylcyclopentyl group (including all structural isomers), a methylethylcyclopentyl group (all structures) Isomer), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), Diethylcyclohexyl group (including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl An alkylcycloalkyl group having 6 to 11 carbon atoms such as a group (including all structural isomers); an aryl group such as a phenyl group and a naphthyl group:
Tolyl group (including all structural isomers), xylyl group (including all structural isomers), ethylphenyl group (including all structural isomers), linear or branched propylphenyl group (including all structural isomers) Isomers), linear or branched butylphenyl groups (including all structural isomers), linear or branched pentylphenyl groups (including all structural isomers), linear or branched C7-C12 alkylaryl groups such as hexylphenyl group (including all structural isomers); benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomer), phenylbutyl group (butyl Group isomers), phenylpentyl groups (including pentyl group isomers), and phenylhexyl groups (including hexyl group isomers) such as arylalkyl groups having 7 to 12 carbon atoms; It is. Specific examples of preferred monomers as the component (V-1) include, for example, C1 to C18 alkyl acrylates, C1 to C18 alkyl methacrylates, C2 to C20 olefins, styrene, methylstyrene, and anhydrides. Maleic esters, maleic anhydride amides, and mixtures thereof, and the like.

Embedded image (12) In the formula, R ⁵⁵ represents a hydrogen atom or a methyl group;
⁵⁶ represents an alkylene group having 2 to 18 carbon atoms, and Z ¹ represents an amine residue or a heterocyclic residue containing 1-2 nitrogen atoms and 0-2 oxygen atoms. A is an integer of 0 or 1.

Embedded image (13) In the formula, R ⁵⁷ represents a hydrogen atom or a methyl group;
² represents an amine residue or a heterocyclic residue containing 1-2 nitrogen atoms and 0-2 oxygen atoms. Specific examples of the alkylene group for R ⁵⁶ include a linear or branched ethylene group, a linear or branched propylene group, a linear or branched butylene group, and a linear or branched pentylene group. A straight or branched hexylene group, a straight or branched heptylene group, a straight or branched octylene group, a straight or branched nonylene group,
Straight or branched decylene group, straight or branched undecylene group, straight or branched dodecylene group, straight or branched tridecylene group, straight or branched tetradecylene group, straight or branched Pentadecylene group, linear or branched hexadecylene group, linear or branched heptadecylene group, linear or branched octadecylene group, and the like. Z ¹ and Z ²
Specifically, for example, each individually, for example, dimethylamino group, diethylamino group, dipropylamino group, dibutylamino group, anilino group, toluidino group, xylidino group, acetylamino group, benzoylamino group, morpholino Groups, a pyrrolyl group, a pyrrolino group, a pyridyl group, a methylpyridyl group, a pyrrolidinyl group, a piperidinyl group, a quinonyl group, a pyrrolidonyl group, a pyrrolidno group, an imidazolino group, a pyrazino group, and the like. (V-
Preferred as the nitrogen-containing monomer as the component 2) are, for example, dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-methyl-5-vinylpyridine, morpholinomethyl methacrylate, Examples include morpholinoethyl methacrylate, N-vinylpyrrolidone, and mixtures thereof. In addition, the dispersion type viscosity index improver in the present invention means a copolymer having a nitrogen-containing monomer as a comonomer, such as the component (V-2). The dispersion-type viscosity index improver comprises one or two or more monomers selected from the compounds (V-1) and (V-
2) It can be obtained by copolymerizing one or more nitrogen-containing monomers selected from compounds.
The molar ratio of the component (V-1) to the component (V-2) at the time of copolymerization is arbitrary, but is generally about 80:20 to 95: 5. The copolymerization may be carried out in any manner, but usually, in the presence of a polymerization initiator such as benzoyl peroxide (V
A copolymer can be easily obtained by radical solution polymerization of the component -1) and the component (V-2). Specific examples of the viscosity index improver include non-dispersed and dispersed polymethacrylates, non-dispersed and dispersed ethylene-α-olefin copolymers and hydrides thereof, polyisobutylene and hydrides thereof, and styrene-diene hydrogen. Copolymerized copolymer, styrene-maleic anhydride copolymer, polyalkylstyrene and the like. By blending one or two or more arbitrarily selected from these viscosity index improvers, the high temperature viscosity particularly required for traction drive fluids for automobiles is increased, and the balance with low temperature fluidity is obtained. Can be improved. The addition amount of the viscosity index improver is not particularly limited, but is preferably 0.1 to 20% by mass, and more preferably 0.1 to 10% by mass. If the addition amount exceeds 20% by mass, the traction coefficient of the fluid decreases, while if it is less than 0.1% by mass, the effect of addition is poor. Usually, the viscosity index improver is used together with its synthetic solvent, but in the present invention,
A fluid represented by the general formula (1), an isobutene oligomer,
It is desirable to use the hydride and the compounds represented by the general formulas (4) to (8) as a solvent in the synthesis. It is necessary to select the molecular weight of these viscosity index improvers in consideration of shear stability. Specifically, the number average molecular weight of the viscosity index improver is, for example, in the case of a dispersion type and non-dispersion type polymethacrylate, 5000 to 150,000,
Preferably, those having 5000 to 35000 are desirable. In the case of polyisobutylene and its hydride, 800
-5000, preferably 2000-4000. If the number average molecular weight of polyisobutylene and its hydride is less than 800, the viscosity increase is low and the traction coefficient is low. If it exceeds 5,000, the shear stability is deteriorated and the low temperature fluidity is deteriorated. Among these viscosity index improvers, in particular, the number average molecular weight is more than 800 and 150,000 or less, preferably 3000 to 20,000.
The ethylene-α-olefin copolymer or its hydride has a high traction coefficient, and is excellent in low-temperature fluidity, and high in high-temperature viscosity, and is generally excellent by being blended in a traction drive fluid. It is a particularly preferred synthetic oil in that a traction drive fluid having performance can be obtained. The number average molecular weight of the ethylene-α-olefin copolymer or its hydride is 80.
When it is less than 0, the viscosity increase is low and the traction coefficient decreases, and when it exceeds 150,000, the shear stability deteriorates. The ethylene component content in the ethylene-α-olefin copolymer or its hydride is not particularly limited, but is preferably 30 to 80 mol%, more preferably 50 mol%.
~ 80 mol%. Examples of the α-olefin include propylene and 1-butene, and propylene is more preferable.

The traction drive fluid of the present invention preferably contains an ashless dispersant and a phosphorus-based additive. By combining these ashless dispersants (Q component) and phosphorus-based additives (P component), it is possible to add abrasion resistance, oxidation stability and cleanliness required for a hydraulic control mechanism.
In the present invention, the Q component includes, for example,
A nitrogen-containing compound having at least one alkyl group or alkenyl group in the molecule or a derivative thereof, or a modified product of alkenyl succinimide, and one or more arbitrarily selected from these. Can be blended. The alkyl group or alkenyl group may be linear or branched, but is preferably, for example, olefins such as propylene, 1-butene and isobutylene, and oligomers of ethylene and propylene. Derived branched alkyl groups and branched alkenyl groups are exemplified. The alkyl or alkenyl group has 40 to 400, preferably 60 to 350, carbon atoms. When the number of carbon atoms of the alkyl group or alkenyl group is less than 40, the solubility of the compound in the lubricating base oil is reduced. On the other hand, when the number of carbon atoms of the alkyl group or alkenyl group exceeds 400, the low temperature of the traction drive fluid is low. Since the fluidity deteriorates, each is not preferable. The nitrogen content of the nitrogen-containing compound mentioned as an example of the Q component is arbitrary, but from the viewpoint of wear resistance, oxidation stability, friction characteristics, and the like, the nitrogen content is usually 0.01 to
10% by mass, preferably 0.1 to 10% by mass is desirably used. Specific examples of the Q component include: (Q-1) succinimide having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in a molecule, or a derivative thereof (Q-2) having 40 to 40 carbon atoms Benzylamine having at least one alkyl or alkenyl group of 400 in the molecule or a derivative thereof (Q-3) Polyamine having at least one alkyl or alkenyl group having 40 to 400 carbon atoms in the molecule or a derivative thereof And one or more compounds selected from the above. As the succinimide (Q-1), more specifically, for example, the following general formula (14) or (1)
And the compound represented by 5).

Embedded image (Wherein R ⁵⁸ has 40 to 400 carbon atoms, preferably 60 to 400 carbon atoms)
350 represents an alkyl group or an alkenyl group, and b represents 1 to
5, preferably an integer from 2 to 4. )

Embedded image (Wherein, R ⁵⁹ and R ⁶⁰ each independently have 40 to 40 carbon atoms)
Represents an alkyl or alkenyl group of 400, preferably 60 to 350, and c is an integer of 0 to 4, preferably 1 to 3. The succinimide is a compound represented by the general formula (1) in which succinic anhydride is added to one end of a polyamine during imidization.
A so-called monotype succinimide such as 4),
There is a so-called bis-type succinimide represented by the general formula (15) in which succinic anhydride is added to both ends of a polyamine. As the component (Q-1), any one of
Also, a mixture of these can be used. The above (Q-
2) As benzylamine, more specifically, for example,
Examples include compounds represented by the general formula (16).

Embedded image (Wherein R ⁶¹ has 40 to 400 carbon atoms, preferably 60 to 400 carbon atoms)
Represents 350 alkyl groups or alkenyl groups, and d is 1 to
5, preferably an integer from 2 to 4. The method for producing this benzylamine is not particularly limited. For example, a polyolefin such as a propylene oligomer, polybutene, or ethylene-α-olefin copolymer is reacted with phenol to form an alkylphenol, which is then reacted with formaldehyde. It can be obtained by reacting a polyamine such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine by a Mannich reaction. More specifically, the (Q-3) polyamine includes, for example, a compound represented by the general formula (17).

Embedded image (Wherein, R ⁶² has 40 to 400 carbon atoms, preferably 60 to 400 carbon atoms.
Represents 350 alkyl groups or alkenyl groups, and e is 1 to
5, preferably an integer from 2 to 4. The method for producing the polyamine is not limited at all. For example, after chlorinating a polyolefin such as propylene oligomer, polybutene, and ethylene-α-olefin copolymer, the polyamine is added to ammonia, ethylenediamine, diethylenetriamine, and triethylene. It can be obtained by reacting a polyamine such as tetramine, tetraethylenepentamine and pentaethylenehexamine. In addition, specific examples of the derivative of the nitrogen-containing compound mentioned as an example of the Q component include, for example, a monocarboxylic acid having 2 to 30 carbon atoms (such as a fatty acid), oxalic acid, and phthalate as described above. Acid, trimellitic acid, by reacting a polycarboxylic acid having 2 to 30 carbon atoms such as pyromellitic acid,
A so-called acid-modified compound in which a part or all of the remaining amino group and / or imino group is neutralized or amidated; Or a so-called boron-modified compound in which a part or all of the imino group is neutralized or amidated; a sulfur-modified compound obtained by allowing a sulfur compound to act on the nitrogen-containing compound described above; A modified compound obtained by combining two or more modifications selected from acid modification, boron modification, and sulfur modification. Also,
The content of the Q component is not particularly limited, and is 0.01 to 10.0% by weight, preferably 0.1 to 7.0% by weight based on the total amount of the composition.
% By weight is desirable. When the content of the Q component is less than 0.01% by mass, there is no effect on cleanliness.
If the content exceeds 0.0% by mass, the low-temperature fluidity of the traction drive fluid is significantly deteriorated, which is not preferable.

In the present invention, the P component includes zinc alkyldithiophosphate, phosphoric acid, phosphorous acid, phosphoric acid monoesters, phosphoric diesters, phosphoric triesters,
Examples include phosphite monoesters, phosphite diesters, phosphite triesters, and salts of the aforementioned esters with amines, alkanolamines, and the like. Among the P components mentioned above, those excluding phosphoric acid and phosphorous acid are esters comprising an aromatic group such as an alkyl group and / or an alkenyl group and / or a phenyl group or a toluyl group having 3 to 18 carbon atoms. is there. One or more of these P components can be arbitrarily compounded. These P
The amount of the component is not particularly limited and can be arbitrarily determined, but is usually 0.005 to 0.2% by weight as a phosphorus element.
Is desirable. If it is less than 0.005, there is no effect on the abrasion resistance, and if it exceeds 0.2, the oxidation stability is deteriorated, which is not preferable.

The traction drive fluid of the present invention preferably contains a friction modifier. The friction modifier has at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule and does not contain a hydrocarbon group having 31 or more carbon atoms in the molecule. By blending the (S component), a traction drive fluid having optimized friction characteristics can be obtained. The alkyl or alkenyl group of the friction modifier may be linear or branched, but has 6 to 30, preferably 9 to 9 carbon atoms.
Twenty-four compounds are desirable. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. Specific examples of the alkyl group or alkenyl group include a linear or branched hexyl group, a linear or branched heptyl group, a linear or branched octyl group, and a linear or branched nonyl group. A linear or branched decyl group, a linear or branched undecyl group, a linear or branched dodecyl group, a linear or branched tridecyl group, a linear or branched tetradecyl group, a linear or branched A branched pentadecyl group, a straight or branched hexadecyl group, a straight or branched heptadecyl group, a straight or branched octadecyl group, a straight or branched nonadecyl group, a straight or branched icosyl group, Straight or branched henicosyl group, straight or branched docosyl group, straight or branched tricosyl group, straight or branched tetracosyl group, straight or branched pentacosyl group, straight or branched Hexacosyl group, straight-chain or branched heptaco An alkyl group such as a linear or branched octacosyl group, a linear or branched nonacosyl group, a linear or branched triacontyl group; a linear or branched hexenyl group, a linear or branched heptenyl group Group, straight or branched octenyl group, straight or branched nonenyl group, straight or branched decenyl group, straight or branched undecenyl group, straight or branched dodecenyl group, straight or A branched tridecenyl group, a straight or branched tetradecenyl group, a straight or branched pentadecenyl group, a straight or branched hexadecenyl group,
Straight or branched heptadecenyl group, straight or branched octadecenyl group, straight or branched nonadecenyl group, straight or branched icosenyl group, straight or branched henicocenyl group, straight or branched A docosenyl group, a linear or branched tricosenyl group, a linear or branched tetracosenyl group, a linear or branched pentacosenyl group, a linear or branched hexacosenyl group, a linear or branched heptacosenyl group, An alkenyl group such as a chain or branched octacocenyl group, a linear or branched nonacocenyl group, and a linear or branched triacontenyl group. Further, it is not preferable to contain a hydrocarbon group having 31 or more carbon atoms as a friction modifier because the friction characteristics of the wet clutch deteriorate.

Specific examples of the friction modifier (S component) include: (S-1) at least one alkyl or alkenyl group having 9 to 30 carbon atoms in the molecule and 31 or more carbon atoms. Compounds having no hydrocarbon group in the molecule or derivatives thereof (S-2) Hydrocarbons having at least one alkyl or alkenyl group having 9 to 30 carbon atoms in the molecule and having 31 or more carbon atoms A phosphorus compound having no group in the molecule, or a derivative thereof; (S-3) a hydrocarbon group having at least one alkyl group or alkenyl group having 9 to 30 carbon atoms in the molecule and having 31 or more carbon atoms. Preferred compounds include one or more compounds selected from amides or metal salts of fatty acids not contained in the molecule. Here (S
As the amine compound of -1), more specifically, for example, an aliphatic monoamine represented by the following general formula (18) or an alkylene oxide adduct thereof, and the following general formula (1)
The aliphatic polyamine represented by 9) and the imidazoline compound represented by the general formula (20) are exemplified.

Embedded image (Wherein R ⁶³ has 9 to 30 carbon atoms, preferably 11 to 24 carbon atoms)
R ⁶⁴ and R ⁶⁵ each independently represent an ethylene group or a propylene group;
⁶⁶ and R ⁶⁷ are each independently a hydrogen atom or a group having 1 to 3 carbon atoms.
0 represents a hydrocarbon group, and f and g each independently represent 0
-10, preferably an integer of 0-6, and f + g =
It is 0-10, preferably 0-6. )

Embedded image (Wherein R ⁶⁸ has 9 to 30 carbon atoms, preferably 11 to 24 carbon atoms)
Represents an alkyl group or an alkenyl group, R ⁶⁹ represents an ethylene group or a propylene group, R ⁷⁰ and R ⁷¹ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms,
h is an integer of 1 to 5, preferably 1 to 4. )

Embedded image (Wherein R ⁷² has 9 to 30 carbon atoms, preferably 11 to 24 carbon atoms)
R ⁷³ represents an ethylene group or a propylene group; R ⁷⁴ represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; i represents 0 to 10, preferably 0 to 6; Is an integer. The alkyl group or alkenyl group represented by R ⁶³ , R ⁶⁸ and R ⁷² may be linear or branched, and preferably has 6 to 30, preferably 9 to 24 carbon atoms. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6, or 30
If it exceeds, the friction characteristics of the wet clutch deteriorate, which is not preferable. Specific examples of the alkyl group or alkenyl group represented by R ⁶³ , R ⁶⁸ and R ⁷² include, for example, the various alkyl groups and alkenyl groups described above. , Lauryl group, myristyl group, palmityl group, stearyl group, oleyl group, etc.
Is particularly preferred. Examples of the group represented by R ⁶⁶ , R ⁶⁷ , R ⁷⁰ , R ⁷¹ and R ⁷⁴ include, for example, a hydrogen atom; a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group;
Isobutyl, sec-butyl, tert-butyl, linear or branched pentyl, linear or branched hexyl, linear or branched heptyl, linear or branched octyl, Chain or branched nonyl group, straight or branched decyl group, straight or branched undecyl group, straight or branched dodecyl group, straight or branched tridecyl group, straight or branched Tetradecyl group, linear or branched pentadecyl group, linear or branched hexadecyl group, linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear Or a branched icosyl group, a straight or branched henicosyl group, a straight or branched docosyl group, a straight or branched tricosyl group, a straight or branched tetracosyl group, a straight or branched pentacosyl Group, straight-chain or branched hexacosyl group, straight Or an alkyl group such as a branched or heptacosyl group, a straight or branched octacosyl group, a straight or branched nonacosyl group, a straight or branched triacontyl group; a straight or branched butenyl group, a straight or branched Branched pentenyl group, straight or branched hexenyl group, straight or branched heptenyl group, straight or branched octenyl group, straight or branched nonenyl group, straight or branched decenyl group A linear or branched undecenyl group, a linear or branched dodecenyl group, a linear or branched tridecenyl group, a linear or branched tetradecenyl group, a linear or branched pentadecenyl group, a linear or branched A branched hexadecenyl group, a linear or branched heptadecenyl group, a linear or branched octadecenyl group, a linear or branched nonadecenyl group, a linear or branched icosenyl group, a linear or branched henicocenyl group, Straight chain Is a branched docosenyl group, a linear or branched tricosenyl group, a linear or branched tetracosenyl group, a linear or branched pentacosenyl group, a linear or branched hexacosenyl group, a linear or branched heptacosenyl An alkenyl group such as a group, a linear or branched octacosenyl group, a linear or branched nonacosenyl group, a linear or branched triacontenyl group; and a carbon number of 5 to 5 carbon atoms such as a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. 7, a cycloalkyl group; a methylcyclopentyl group,
Dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (including all structural isomers), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers) (Including structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers) ), A methylethylcycloheptyl group (including all structural isomers), a diethylcycloheptyl group (including all structural isomers), etc.
Aryl groups such as phenyl group and naphthyl group: tolyl group (including all structural isomers), xylyl group (including all structural isomers), and ethylphenyl group (including all structural isomers). Propylphenyl group (including all structural isomers), linear or branched butylphenyl group (including all structural isomers), linear or branched pentylphenyl group (Including all structural isomers), linear or branched hexylphenyl group (including all structural isomers), linear or branched heptylphenyl group (including all structural isomers), linear Or a branched octylphenyl group (including all structural isomers), a linear or branched nonylphenyl group (including all structural isomers), a linear or branched decylphenyl group (including all structural isomers) Body), linear or Branched undecylphenyl (including all structural isomers), carbon atoms such as linear or branched dodecylphenyl group (including all structural isomers) 7
Benzyl group, phenylethyl group, phenylpropyl group (including isomer of propyl group), phenylbutyl group (including isomer of butyl group), phenylpentyl group (isomer of pentyl group) ), And arylalkyl groups having 7 to 12 carbon atoms such as a phenylhexyl group (including isomers of a hexyl group). As the aliphatic monoamine represented by the formula (18) or the alkylene oxide adduct thereof, the formula (18)
In the above, R ⁶⁶ and R ⁶⁷ are each independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and an aliphatic monoamine wherein f = g = 0, or R ⁶⁶ and R ⁶⁷ are hydrogen atoms, and Alkylene oxide adducts of aliphatic monoamines in which f and g are independently 0 to 6 and f + g = 1 to 6 are more preferably used. In addition, as the aliphatic polyamine represented by the formula (19), in the formula (19), R ⁷⁰ and R ⁷¹ are each independently a hydrogen atom or a carbon atom having 1 to 6 carbon atoms because the friction characteristics of a wet clutch are more excellent. The aliphatic polyamine which is the alkyl group is more preferably used. The imidazoline compound represented by the formula (20) is preferably an imidazoline compound in which R ⁷⁴ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms in the formula (20), since the friction characteristics of a wet clutch are more excellent. Is more preferably used.
On the other hand, as the derivative of the amine compound referred to in (S-1), specifically, for example, an amine compound represented by the above formulas (18) to (20) is added to a monocarboxylic acid having 2 to 30 carbon atoms (such as a fatty acid). Or by reacting a polycarboxylic acid having 2 to 30 carbon atoms such as oxalic acid, phthalic acid, trimellitic acid, and pyromellitic acid to neutralize a part or all of the remaining amino group and / or imino group. Amidated, so-called acid-modified compound; a boric acid acting on an amine compound represented by formulas (18) to (20) to neutralize a part or all of the remaining amino group and / or imino group; A so-called boric acid-modified compound; an amine compound represented by formulas (18) to (20) having one or two hydrocarbon groups having 1 to 30 carbon atoms in the molecule;
By reacting an acidic phosphoric acid ester or an acidic phosphite which does not contain a hydrocarbon group having at least 31 carbon atoms and has at least one hydroxyl group, a part or all of the remaining amino group and / or imino group is reacted. Neutralized phosphoric acid ester salts; so-called alkylene oxide adducts of amine compounds obtained by reacting an amine compound such as formula (19) or (20) with an alkylene oxide such as ethylene oxide or propylene oxide; Modified products of amine compounds obtained by combining two or more types of modifications selected from Specific examples of the amine compound (S-1) or a derivative thereof include laurylamine, lauryldiethylamine, lauryldiethanolamine, dodecyldipropanolamine, palmitylamine, stearylamine, and the like, from the viewpoint of excellent friction characteristics of a wet clutch. Amine compounds such as stearyltetraethylenepentamine, oleylamine, oleylpropylenediamine, oleyldiethanolamine, N-hydroxyethyloleylimidazoline; alkylene oxide adducts of these amine compounds; these amine compounds and acidic phosphate esters (for example, di-2-ethylhexylline Acid esters), salts with acidic phosphites (e.g., di-2-ethylhexyl phosphite); these amine compounds,
An alkylene oxide adduct of an amine compound or a boric acid-modified (phosphite) phosphate salt of an amine compound; or a mixture thereof is particularly preferably used.

More specifically, the phosphorus compound (S-2) is, for example, a phosphoric ester represented by the following general formula (21) and a phosphorus suboxide represented by the following general formula (22) Acid esters and the like.

Embedded image (Wherein, R ⁷⁵ represents an alkyl group or alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms; R ⁷⁶ and R ⁷⁷ each represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; ¹ , X ² , X ³ and X ⁴ are each independently an oxygen atom or a sulfur atom, and at least one of X ¹ , X ² , X ³ and X ⁴ is an oxygen atom.)

Embedded image (Wherein, R ⁷⁸ represents an alkyl group or alkenyl group having 6 to 30 carbon atoms, preferably 9 to 24 carbon atoms, and R ⁷⁹ and R ⁸⁰ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. , X ^5, X ⁶ and X ⁷ are each independently an oxygen atom or a sulfur atom, and at least one of X ^5, X ⁶ and X ⁷ is an oxygen atom.) in addition, the R ⁷⁵ and R ⁷⁸ The alkyl group or alkenyl group shown may be linear or branched, but preferably has 6 to 30, preferably 9 to 24 carbon atoms. When the number of carbon atoms of the alkyl group or the alkenyl group is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate,
Each is not preferred. Specific examples of the alkyl group or the alkenyl group include various alkyl groups and alkenyl groups as described above, and in particular, a lauryl group,
A straight-chain alkyl or alkenyl group having 12 to 18 carbon atoms such as a myristyl group, a palmityl group, a stearyl group, and an oleyl group is particularly preferred. R ⁷⁶ , R ⁷⁷ , R ⁷⁹ and R ⁸⁰
Specific examples include, for example, individually a hydrogen atom; methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, A chain or branched pentyl group,
Straight or branched hexyl group, straight or branched heptyl group, straight or branched octyl group, straight or branched nonyl group, straight or branched decyl group, straight or branched chain A undecyl group, a linear or branched dodecyl group, a linear or branched tridecyl group, a linear or branched tetradecyl group, a linear or branched pentadecyl group, a linear or branched hexadecyl group,
Linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or branched icosyl group, linear or branched henicosyl group, linear or branched A docosyl group, a straight or branched tricosyl group, a straight or branched tetracosyl group, a straight or branched pentacosyl group, a straight or branched hexacosyl group, a straight or branched heptacosyl group, An alkyl group such as a chain or branched octakosyl group, a straight or branched nonacosyl group, a straight or branched triacontyl group; a straight or branched butenyl group,
Linear or branched pentenyl group, linear or branched hexenyl group, linear or branched heptenyl group, linear or branched octenyl group, linear or branched nonenyl group, linear or branched A decenyl group, a linear or branched undecenyl group, a linear or branched dodecenyl group, a linear or branched tridecenyl group, a linear or branched tetradecenyl group, a linear or branched pentadecenyl group, A chain or branched hexadecenyl group,
Linear or branched heptadecenyl group, linear or branched octadecenyl group, linear or branched nonadecenyl group, linear or branched icosenyl group, linear or branched henicocenyl group, linear or branched A docosenyl group, a linear or branched tricosenyl group, a linear or branched tetracosenyl group, a linear or branched pentacosenyl group, a linear or branched hexacosenyl group, a linear or branched heptacosenyl group, An alkenyl group such as a chain or branched octacocenyl group, a linear or branched nonacocenyl group, a linear or branched triacontenyl group; a cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group or a cycloheptyl group; Alkyl group; methylcyclopentyl group, dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (all structural isomers) Includes), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (Including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcycloheptyl group (all An alkylcycloalkyl group having 6 to 11 carbon atoms such as a phenyl group, a naphthyl group and the like: a tolyl group (including all structural isomers), a xylyl group (including all structural isomers) ), An ethylphenyl group (including all structural isomers), a linear or branched propylphenyl group Linear or branched butylphenyl groups (including all structural isomers), linear or branched pentylphenyl groups (including all structural isomers), linear or branched A branched hexylphenyl group (including all structural isomers), a linear or branched heptylphenyl group (including all structural isomers), a linear or branched octylphenyl group (including all structural isomers) ), A linear or branched nonylphenyl group (including all structural isomers), a linear or branched decylphenyl group (including all structural isomers), a linear or branched undecyl Each alkylaryl group having 7 to 18 carbon atoms such as a phenyl group (including all structural isomers), a linear or branched dodecylphenyl group (including all structural isomers); a benzyl group, a phenylethyl group, Phenylpropyl group (of propyl group Having 7 to 7 carbon atoms such as phenylbutyl group (including isomer of pentyl group), phenylpentyl group (including isomer of pentyl group), phenylhexyl group (including isomer of hexyl group) 12 arylalkyl groups; and the like. As the phosphorus compound (S-2), the friction characteristics of the wet clutch are more excellent.
In the formula (21), an acidic phosphate ester in which at least one of R ⁷⁶ and R ⁷⁷ is a hydrogen atom, or the formula (2)
In 2), an acidic phosphite in which at least one of R ⁷⁹ and R ⁸⁰ is a hydrogen atom is more preferably used. Specific examples of the derivative of the phosphorus compound represented by (S-2) include, for example, an acidic phosphate ester in which at least one of R ⁷⁶ and R ⁷⁷ in the formula (21) is a hydrogen atom, 22) In the acidic phosphite wherein at least one of R ⁷⁹ and R ⁸⁰ is a hydrogen atom in 22),
A salt obtained by reacting ammonia or a nitrogen-containing compound such as an amine compound containing only a hydrocarbon group having 1 to 8 carbon atoms or a hydroxyl group-containing hydrocarbon group in a molecule to neutralize a part or all of the remaining acidic hydrogen. And the like. Specific examples of the nitrogen-containing compound include, for example, ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, Diethylamine, methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine,
Alkylamines such as propylbutylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, and dioctylamine (the alkyl group may be linear or branched); monomethanolamine, monoethanolamine, monopropanolamine, monoamine Butanolamine, monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine , Ethanol butanolamine, propanol butanolamine, dibutanolamine, dipentanolamine, dihexano Triethanolamine, di-heptanol amine,
Alkanolamines such as dioctanolamine (alkanol groups may be linear or branched); and mixtures thereof. Specific examples of the phosphorus compound (S-2) or its derivative include monolauryl phosphate,
Dilauryl phosphate, monostearyl phosphate, distearyl phosphate, monooleyl phosphate, dioleyl phosphate, monolauryl phosphite, dilauryl phosphite, monostearyl phosphite, distearyl phosphorous Acid ester, monooleyl phosphite, dioleyl phosphite, monolauryl thiophosphate, dilauryl thiophosphate, monostearyl thiophosphate, distearyl thiophosphate, monooleyl thiophosphate, dioleyl thiophosphate , Monolaurylthiophosphite, dilaurylthiophosphite, monostearylthiophosphite, distearylthiophosphite, monooleylthiophosphite Stell, dioleyl thiophosphite, and phosphates, phosphites, thiophosphates, amine salts of thiophosphites (such as mono-2-ethylhexylamine salt), and mixtures thereof are particularly preferably used. Can be

The fatty acid in the fatty acid amide or fatty acid metal salt of (S-3) may be a linear fatty acid or a branched fatty acid, and may be a saturated fatty acid or an unsaturated fatty acid. Is 6 ~
30, preferably 9 to 24. When the number of carbon atoms of the alkyl group or the alkenyl group of the fatty acid is less than 6 or more than 30, the friction characteristics of the wet clutch deteriorate, which is not preferable. Specific examples of the fatty acid include linear or branched heptanoic acid, linear or branched octanoic acid, linear or branched nonanoic acid, linear or branched decanoic acid, linear or branched Branched undecanoic acid, straight or branched dodecanoic acid, straight or branched tridecanoic acid, straight or branched tetradecanoic acid, straight or branched pentadecanoic acid, straight or branched hexadecanoic acid Linear or branched heptadecanoic acid, linear or branched octadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid,
Straight or branched henicosanoic acid, straight or branched docosanoic acid, straight or branched tricosanoic acid, straight or branched tetracosanoic acid, straight or branched pentacosanoic acid, straight or branched Saturated fatty acids such as hexacosanoic acid, linear or branched heptacosanoic acid, linear or branched octacosanoic acid, linear or branched nonacosanoic acid, linear or branched triacontyl group; linear or branched Heptenoic acid, linear or branched octenoic acid, linear or branched nonenoic acid, linear or branched decenoic acid, linear or branched undecenoic acid, linear or branched dodecenoic acid, linear Or branched tridecenoic acid, straight or branched tetradecenoic acid, straight or branched pentadecenoic acid, straight or branched hexadecenoic acid, straight or branched heptadecenoic acid, straight or branched octadecene Acid, linear or branched nonadecene Linear or branched icosenoic acid, linear or branched henicosenoic acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, linear or branched tetracosenoic acid, linear or branched Branched pentacosenoic acid, straight or branched hexacosenoic acid, straight or branched heptacosenoic acid, straight or branched octacosenic acid, straight or branched nonacosenic acid, straight or branched triaconthenic acid Unsaturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and linear fatty acids derived from various fats and oils (coconut oil). Fatty acid) and a mixture of a linear fatty acid synthesized by an oxo method and a branched fatty acid. As the fatty acid amide referred to in (S-3), specifically, for example, the aforementioned fatty acid or its acid chloride contains only ammonia, a hydrocarbon group having 1 to 8 carbon atoms, or a hydroxyl group-containing hydrocarbon group in a molecule. An amide obtained by reacting a nitrogen-containing compound such as an amine compound is exemplified. As this nitrogen-containing compound,
Specifically, for example, ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine,
Alkylamines such as methylethylamine, diethylamine, methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, etc. May be chain or branched); monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine,
Monopentanolamine, monohexanolamine, monoheptanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanol Alkanolamines such as amines, propanolbutanolamine, dibutanolamine, dipentanolamine, dihexanolamine, diheptanolamine, dioctanolamine (alkanol groups may be linear or branched); and mixtures thereof And the like. As the fatty acid amide of (S-3),
Specifically, lauric amide, lauric diethanolamide, lauric monopropanolamide, myristic amide, myristic diethanolamide, myristic monopropanolamide, palmitic amide, palmitic amide Acid diethanolamide, palmitic acid monopropanolamide, stearic acid amide, stearic acid diethanolamide, stearic acid monopropanolamide, oleic acid amide, oleic acid diethanolamide, oleic acid monopropanolamide, coconut oil fatty acid amide, coconut oil fatty acid diethanolamide Coconut oil fatty acid monopropanolamide, C12-13 synthetic mixed fatty acid amide, C12-13 synthetic mixed fatty acid diethanolamide, carbon 12-13 Synthetic mixed fatty acid mono-propanol amides, and mixtures thereof and the like are particularly preferably used. On the other hand, specific examples of the fatty acid metal salt referred to in (S-3) include, for example, alkaline earth metal salts of the fatty acid (magnesium salt, calcium salt, etc.).
And zinc salts. As the fatty acid metal salt of (S-3), specifically, calcium laurate, calcium myristate, calcium palmitate, calcium stearate, calcium oleate, calcium cocoate, C12 to C13 synthetic mixed fatty acid calcium, zinc laurate, zinc myristate, zinc palmitate,
Particularly preferred are zinc stearate, zinc oleate, coconut oil fatty acid zinc, synthetic mixed fatty acid zinc having 12 to 13 carbon atoms, and mixtures thereof.

One or more arbitrarily selected S components may be added in any amount as long as it does not affect other performances, such as oxidation stability. In order to increase the durability of the frictional characteristics, it is necessary to prevent the deterioration of the frictional characteristics due to the deterioration of the S component. It is effective. However, if the amount is too large, the coefficient of static friction, which needs to be high to maintain the engagement of the wet clutch, also decreases. Therefore, the amount of the S component is limited. When it is necessary to add an S component exceeding this limit in order to increase the durability of the friction characteristics, an additive (Y component) for increasing the friction coefficient can be added. The following are examples of the Y component. (Y-1) A compound having a polar group represented by the S component in the same molecule and a lipophilic group being a hydrocarbon group having 100 or less carbon atoms. In using the Y-1 component, its polar group may be the same as or different from the S component used. (Y-2) a nitrogen-containing compound (e.g., succinimide or amide compound) having a hydrocarbon group having 60 or less carbon atoms, or a modified product thereof with a boron compound (e.g., boric acid) or a sulfur compound; Certain compounds.

Further, the traction drive fluid of the present invention preferably contains a metal-based detergent. By blending the metal-based detergent (T component), it is possible to optimize the friction characteristics of the wet clutch and to suppress a decrease in strength against repeated compression. The metal-based detergent has a total base number of 20 to 450 mgKOH / g, preferably 50 to 450 mgKOH / g.
A basic metal based detergent of 400 mg KOH / g is desirable. In addition, the total base number mentioned here is JIS K2501
7. Petroleum products and lubricating oils-Neutralization number test method Means the total base number measured by the perchloric acid method in accordance with When the total base number of the metal-based detergent is less than 20 mgKOH / g, the effect of suppressing the decrease in strength against repeated compression of the wet clutch is insufficient, while the total base number is 4 mgKOH / g.
If it exceeds 50 mgKOH / g, it is not preferable because it is structurally unstable and the storage stability of the composition deteriorates. Specific examples of the T component include (T-1) an alkaline earth metal sulfonate having a total base number of 20 to 450 mgKOH / g, and (T-2) an alkaline earth metal phenate having a total base number of 20 to 450 mgKOH / g. T-3) One or more metal-based detergents selected from alkaline earth metal salicylates having a total base number of 20 to 450 mgKOH / g. More specifically, the (T-1) alkaline earth metal sulfonate is, for example, an alkyl aromatic sulfone obtained by sulfonating an alkyl aromatic compound having a molecular weight of 100 to 1500, preferably 200 to 700. Alkaline earth metal salts of acids, particularly magnesium salts and / or calcium salts, are preferably used. Specific examples of the alkyl aromatic sulfonic acids include so-called petroleum sulfonic acids and synthetic sulfonic acids. As petroleum sulfonic acids,
Generally, sulfonated alkyl aromatic compounds in lubricating oil fractions of mineral oil and by-products during the production of white oil,
So-called mahoganic acid is used. As the synthetic sulfonic acid, for example, an alkylbenzene having a linear or branched alkyl group, which is obtained as a by-product from an alkylbenzene production plant, which is a raw material of a detergent, or obtained by alkylating a polyolefin to benzene, is used as a raw material. A sulfonated version thereof, or a sulfonated version of dinonylnaphthalene is used.
The sulfonating agent for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid or sulfuric acid is usually used. Also, here (T-
2) As the alkaline earth metal phenate, more specifically, for example, an alkylphenol having at least one linear or branched alkyl group having 4 to 30, preferably 6 to 18 carbon atoms, and the alkylphenol and the element Alkaline earth metal salts, especially magnesium salts, of alkylphenol sulfide obtained by reacting sulfur or Mannich reaction product of alkylphenol obtained by reacting this alkylphenol with formaldehyde
Alternatively, a calcium salt is preferably used. Further, as the (T-3) alkaline earth metal salicylate, more specifically, for example, at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms. Alkaline earth metal salts of alkyl salicylic acid, particularly magnesium salts and / or calcium salts, are preferably used. In addition, the alkaline earth metal sulfonate, alkaline earth metal phenate and alkaline earth metal salicylate have metal salts of 20 to 450 mg KO.
As long as it is within the range of H / g, alkyl aromatic sulfonic acid, alkyl phenol, alkyl phenol sulfide, Mannich reaction product of alkyl phenol, alkyl salicylic acid, etc. can be directly converted to magnesium or / and calcium alkaline earth metal oxide or water. Neutral salts (normal salts) obtained by reacting with alkaline earth metal bases such as oxides, or by once replacing alkali metal salts such as sodium salts and potassium salts with alkaline earth metal salts And further obtained by heating these neutral salts (normal salts) and excess alkaline earth metal salts or alkaline earth metal bases (hydroxides or oxides of alkaline earth metals) in the presence of water. Basic salts,
Overbased salts (ultrabasic salts) obtained by reacting a neutral salt (normal salt) with a base of an alkaline earth metal in the presence of carbon dioxide gas are also included. In addition, these reactions are usually
The reaction is performed in a solvent (such as an aliphatic hydrocarbon solvent such as hexane, an aromatic hydrocarbon solvent such as xylene, or a light lubricating base oil). The metal-based detergent is usually commercially available in a diluted state with a light lubricating base oil or the like, and is available, but generally has a metal content of 1.0 to 20% by mass. , Preferably 2.0 to 16% by mass. The amount of the arbitrarily selected one or two or more T components is not particularly limited, and may be 0.01 to 5.0.
% By mass, preferably 0.05 to 4.0% by mass. When the amount is less than 0.01% by mass, the effect of suppressing the decrease in strength of the wet clutch against repeated compression is insufficient. On the other hand, when the amount exceeds 5.0% by mass, the oxidation stability of the composition becomes poor. It is not preferable because they decrease.

By mixing the Q, P, T and S components, the traction drive fluid can be used for abrasion resistance, oxidation stability and cleanliness required for a hydraulic control mechanism, and for a friction characteristic control mechanism of a wet clutch. It is possible to add necessary friction characteristics to wet clutches, strength against repeated compression of wet clutches, etc., but to further improve these performances, and to improve corrosion resistance to non-ferrous metals such as copper-based materials, and nylon Antioxidants, extreme pressure additives, corrosion inhibitors, rubber swelling agents, defoamers, coloring agents, etc. can be further compounded, alone or in combination, for the purpose of improving the durability of resins such as materials. it can. As the antioxidant, any one commonly used in lubricating oils such as a phenolic compound and an amine compound can be used. Specifically, 2-6-di-tert-butyl-4-
Alkylphenols such as methylphenol, methylene-4,4-bisphenol (2,6-di-tert-
Bisphenols such as butyl-4-methylphenol), naphthylamines such as phenyl-α-naphthylamine, dialkyldiphenylamines, zinc dialkyldithiophosphates such as zinc di-2-ethylhexyldithiophosphate, (3,5-di-tert) -Butyl-4-hydroxyphenyl) fatty acid (such as propionic acid) and a monohydric or polyhydric alcohol such as methanol, octadecanol, 1,6-hexanediol, neopentyl glycol, thiodiethylene glycol, triethylene glycol, and pentane Esters with erythritol and the like can be mentioned. One or two or more compounds arbitrarily selected from these can be blended in any amount, but it is usually desirable to blend 0.01 to 5.0% by mass. Examples of extreme pressure additives include sulfur compounds such as disulfides, sulfurized olefins, and sulfurized oils and fats. One or two or more compounds arbitrarily selected from these can be blended in an arbitrary amount, but it is usually desirable to blend 0.1 to 5.0% by mass. Examples of the corrosion inhibitor include benzotriazole-based, tolyltriazole-based, thiadiazole-based and imidazole-based compounds. One or two or more compounds arbitrarily selected from these can be blended in an arbitrary amount, but are usually 0.0
It is desirable to mix 1 to 3.0% by mass. Examples of the antifoaming agent include silicones such as dimethyl silicone and fluorosilicone. One or two or more compounds arbitrarily selected from these can be blended in an arbitrary amount, and are usually 0.001 to 0.001.
It is desirable to add 0.05% by mass. The colorant can be added in any amount, but is usually 0.001 to 1.
It is desirable to mix 0% by mass.

[0017]

As described above, the traction drive fluid of the present invention is not only excellent in power transmission capacity, but also is a traction drive commercially available conventionally, which is particularly required as a continuously variable transmission for automobiles. Hydraulic fluid control fluid and friction characteristics control fluid of wet clutches, which are not included in hydraulic fluids, can be used as traction drive fluids for automobiles. It has become possible.

[0018]

EXAMPLES 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.

First, five kinds of fluids composed of the following components are prepared, and their traction coefficients and ＠ −
Brookfield viscosities (BF viscosities) at 30C and -40C were measured. Table 1 shows the results. In addition, fluid 1-5
Is a naphthene ring-containing hydrocarbon according to the present invention. The traction coefficient was measured using a 4-roller traction coefficient tester. The test conditions were a peripheral speed of 3.14 m / s and an oil temperature of 1.
00 ° C., maximum Hertz pressure 1.49 GPa, slip rate 2%. Component A1: 1,1-dicyclohexylethane Component A2: 1- (3,4-dimethylcyclohexyl)-
1-cyclohexylethane Component A3: 1- (4-methylcyclohexyl) -1-cyclohexylethane Component B1: 1- (2,4-dimethylcyclohexyl)-
1-cyclohexylethane Component B2: 1- (2,5-dimethylcyclohexyl)-
1-cyclohexylethane Component C: isobutene oligomer (number average molecular weight 33
0) In addition, the component A2 was obtained as follows. o-xylene 1
200 g and 150 g of sulfuric acid were collected in a 2 L flask, cooled with ice from the outside, and styrene 500
A mixture of cc and 400 cc of o-xylene was added.
During this time, the reaction temperature was kept at 10 ° C. or lower. Next, after stirring was continued for 1 hour, the reaction was terminated. The obtained product was washed with an aqueous NaOH solution and then with water. After drying, styrene adduct of xylene was obtained by distillation under reduced pressure. 1 L of the above product was collected in a 2 L autoclave and 30 g of nickel / diatomaceous earth catalyst was added. This was hydrogenated under the conditions of 170 ° C. and a hydrogen pressure of 70 atm to obtain an intended product. Similarly, component A3, component B1, and component B2 were also synthesized. The component A1 was obtained by hydrogenating commercially available 1,1-diphenylethane.

[0020]

[Table 1]

As a typical example of a synthetic oil, component D: 2-methyl-2,4-dimethylcyclohexylpentane was selected.
The traction coefficient and the BF viscosity ＠ −30 ° C. were measured for each of the fluid obtained by mixing the fluid 5 and the component D and the fluid obtained by mixing the component C and the component D. Table 2 shows the results.

[0022]

[Table 2]

The fluid 5 itself and the fluid 5 include polymethacrylate (PMA), polyisobutylene (PI
B) and a fluid containing ethylene-α-olefin copolymer (OCP), each having a kinematic viscosity of about 10
0 ° C, low temperature viscosity -30 ° C, and traction coefficient were measured. Table 3 shows the results. The PMA used,
The number average molecular weight (Mn) and the amount of addition of PIB and OCP were PMA: Mn 18,000 and 8.5 mass, respectively.
%, PIB: Mn2700, 7.6 mass%, OC
P: Mn 9900, 3.2 mass%.

[0024]

[Table 3]

The fluid 4 was mixed with an ashless dispersant, a phosphorus-based additive and the like in the proportions shown in the respective examples (fluids 11 to 16) in Table 4 to produce the fluids 11 to 1 respectively.
For No. 6, the abrasion resistance and oxidation stability were evaluated. Table 4 shows the results.

[0026]

[Table 4] ASTM D2882: INDICATING THE WEAR CHARACTE
RISTICS OFPETRORIUM AND NON-PETRORIUM HYDRAULIC FL
UIDSIN A CONSTANT VOLUME VANE PUMP JIS K2514: Lubricating oil, oxidation stability test Ashless dispersant A: Alkenyl succinimide (number average molecular weight 5500) Ashless dispersant B: Borated alkenyl succinimide (number average molecular weight 4500) Phosphorus Additive A: diphenyl hydrogen phosphite

For each of the fluids having the compositions (% by mass) shown in Table 5, the dependency of the friction coefficient on the slip velocity was measured using a low-speed slip tester under the following conditions. Table 5 shows the results. <Test conditions: Conforms to JASO M349-95 (Test method for preventing oil shudder in automatic transmission)> Oil amount: 0.2 L Oil temperature: 80 ° C. Surface pressure: 0.98
MPa

[0028]

[Table 5] Ashless dispersant A: alkenyl succinimide (number average molecular weight 5500) Ashless dispersant B: borated alkenyl succinimide (number average molecular weight 4500) Phosphorus additive A: diphenyl hydrogen phosphite Mg sulfonate A: petroleum, Total base number (perchloric acid method) 300 mgKOH / g Ca sulfonate A: petroleum, total base number (perchloric acid method) 300 mgKOH / g

For each of the fluids shown in Table 6, the effects of additives on the strength of the wet clutch against repeated compression were examined. Using a stroke tester, the wet clutch was repeatedly compressed under the following conditions, and the number of cycles until peeling of the friction material surface layer was measured. Table 6 shows the results. <Test conditions> Friction material: Cellulose-based friction material Surface pressure: 9.8 MPa
Oil temperature: 120 ° C 1 cycle: pressing 3 seconds / opening 7 seconds

[0030]

[Table 6] Ashless dispersant A: alkenyl succinimide (number average molecular weight 5500) Ashless dispersant B: borated alkenyl succinimide (number average molecular weight 4500) Phosphorus additive A: diphenyl hydrogen phosphite Ca sulfonate A: petroleum Total base number (perchloric acid method) 300 mgKOH / g Ca sulfonate B: Petroleum, Total base number (perchloric acid method) 400 mgKOH / g Ca sulfonate C: Petroleum type, total base number (perchloric acid method) 13 mgKOH / g

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10N 40:04 (72) Inventor Tetsuo Okawa 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Nippon Oil & Oil Co., Ltd.

Claims (9)

[Claims] 1. A traction drive fluid comprising a naphthene ring-containing hydrocarbon represented by the following general formula (1). Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and the others independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. (Which may contain a naphthene ring).) 2. A traction drive fluid comprising a naphthene ring-containing hydrocarbon represented by the following general formula (2). Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ¹ , R ² ,
^{R 3, R 5, R 6} , R 7 and R ⁸ each represent independently hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may have a naphthene ring), ^{and, R 1, R 3, R} 6 And at least one arbitrarily selected from R ⁸ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring). ) 3. A traction drive fluid comprising a naphthene ring-containing hydrocarbon represented by the following general formula (3). Embedded image (In the formula, among R ^{1 to} R ⁸ , R ⁴ represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring), and R ¹ , R ² ,
R ³ , R ⁵ , R ⁶ , R ⁷ and R ⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms (which may contain a naphthene ring), and R ¹ , R ² , R ³ , R ⁶ , R ⁷ and R ⁸
At least one arbitrarily selected from represents an alkyl group having 1 to 8 carbon atoms (which may include a naphthene ring). ) 4. The traction drive fluid according to claim 1, 2, 3 or 4, mineral oil and a molecular weight of 150 to 80.
A traction drive fluid comprising at least one selected from the group consisting of synthetic oils No. 0 and No. 0. 5. A traction drive fluid, characterized in that a viscosity index improver is blended with the traction drive fluid according to claim 1, 2, 3, or 4. 6. The traction drive fluid according to claim 5, wherein the viscosity index improver is an ethylene-α-olefin copolymer having a number average molecular weight of more than 800 and not more than 150,000 or a hydride thereof. 7. A traction drive fluid characterized by comprising an ashless dispersant and a phosphorus-based additive in the traction drive fluid according to claim 1, 2, 3, 4, 5, or 6. 8. The traction drive fluid according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the traction drive fluid has 6 to 6 carbon atoms.
A traction drive fluid comprising a friction modifier containing at least one alkyl group or 30 alkenyl group in the molecule and containing no hydrocarbon group having 31 or more carbon atoms in the molecule. 9. The method of claim 1, 2, 3, 4, 5, 6, or 7.
Or a traction drive fluid according to 8, wherein a metal-based detergent having a total base number of 20 to 450 mgKOH / g is blended.