WO1998017747A1

WO1998017747A1 - Lubricating oil composition for automatic transmissions

Info

Publication number: WO1998017747A1
Application number: PCT/JP1997/002025
Authority: WO
Inventors: Hiroyuki Kaneko; Takanori Kugimiya; Hiroshi Ishida
Original assignee: Tonen Corporation; Toyota Jidosha Kabushiki Kaisha
Priority date: 1996-10-22
Filing date: 1997-06-11
Publication date: 1998-04-30
Also published as: EP0889112A1

Abstract

A lubricating oil composition for automatic transmissions, comprising a base oil and a compound of general formula (I), wherein R?1 and R2¿ are each hydrocarbyl having 5 or more carbon atoms; R3 is a C¿1?-C5 hydrocarbon group; R?4¿ is hydrogen or a C¿1?-C20 hydrocarbyl optionally having an amino group and/or an amide linkage; and n is an integer of 0 to 10.

Description

Specification

Technical field of the invention

TECHNICAL FIELD The present invention relates to a lubricating oil composition for an automatic transmission, and more particularly, to a lubricating oil composition having a high transmission torque capacity and excellent shudder-vibration prevention performance, and particularly suitable for an automatic transmission having a slip control mechanism. It is about things.

In addition, the present invention provides a method of lubricating an automatic transmission having a slip control mechanism. Further, the present invention provides a lubricating method for an automatic transmission having a high transmission torque capacity and an excellent anti-shugging function. It is intended to provide an automatic transmission filled with an oil composition. Background art

The automatic transmission is composed of a torque converter, a wet-type multi-plate clutch, a gear bearing mechanism, and a hydraulic control mechanism that controls them, and has a mechanism that automatically sets the transmission torque capacity according to running conditions.

Lubricating oil for automatic transmission (ATF) is commonly used in these mechanisms in such automatic transmissions. In order to operate the automatic transmission smoothly, as a power transmission fluid, It is required to function as oil and hydraulic oil.

By the way, in recent years, automatic transmissions of many automobiles have a built-in lock-up clutch in the torque converter that is effective for improving the fuel consumption rate, and it is necessary to switch between the torque converter overnight drive and direct drive at the appropriate time. Is designed to directly transmit the driving force of the engine to the transmission according to the driving conditions, thereby improving the efficiency of the torque converter.However, the conventional lock-up mechanism operates only in the high-speed range, Since it was not operated in the low-speed range, when the vehicle started, the vehicle was not operated in the low-speed range. When torque was transmitted by the LUC converter 1, a power transmission loss occurred between the engine output speed and the transmission input speed, causing the fuel consumption rate to deteriorate. In order to reduce this power transmission loss and improve the fuel consumption rate, a slip control system that activates the lock-up mechanism even in the low speed range of automatic transmissions has recently been introduced.

However, it has been pointed out that when the drop-up mechanism is operated in a low speed range, abnormal body vibration called shudder (Shu dder) frequently occurs on the friction surface of the lock-up clutch. In particular, in the case of the slip control type mouth-up clutch, when the friction coefficient decreases as the sliding speed increases, shudder tends to occur, so that the friction coefficient as the sliding speed increases is reduced. There is a demand for lubricating oil for automatic transmissions with improved μ (coefficient of friction)-V (slip speed) characteristics and high anti-shudder vibration prevention performance.

Conventionally, it has been proposed to use amides, carboxylic acids, amines, and the like in addition to phosphate esters as friction modifiers in lubricating oils for automatic transmissions. There was a problem that the friction coefficient of the clutch part was reduced and the transmission torque capacity was insufficient. For this reason, a lubricating oil for an automatic transmission having both shudder vibration prevention performance and transmission torque capacity has been demanded, and technical development thereof has been strongly desired. Disclosure of the invention

SUMMARY OF THE INVENTION The first object of the present invention is to provide a lubricating oil composition for an automatic transmission that is excellent in anti-shudder-vibration performance without impairing the transmission torque capacity in view of the above-mentioned development situation of the lubricating oil for an automatic transmission. Is to provide.

A second object of the present invention is to provide a lubricating method for an automatic transmission having a slip control mechanism using a lubricating oil composition for an automatic transmission having a high transmission torque capacity and excellent shudder vibration prevention performance. Is to provide.

Further, a third object of the present invention is to provide an automatic transmission filled with a lubricating oil composition having a high transmission torque capacity and excellent shudder vibration prevention performance. It is in.

The present inventors have conducted intensive studies to achieve the above object, and as a result, a lubricating oil composition obtained by adding a specific imide compound as described in detail below to a lubricating base oil. It was found that the product had sufficient lubrication characteristics, transmission torque capacity and anti-shudder vibration prevention performance required for lubricating oil for automatic transmissions, and could achieve the intended purpose. Thus, the present invention has been completed.

That is, according to the present invention,

Lubricating base oil,

The following general formula [I]

R ¹

(In the general formula [I], R and R ² may be the same or different, each is a hydrocarbon group having 5 or more carbon atoms, and R ³ is a divalent C 1 to C 5 carbon atom. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and n is an integer of 0 to 10). The present invention relates to a lubricating oil composition for a transmission.

According to the present invention,

The lubricating base oil, based on the total weight of the lubricating oil composition,

(a)

(In the above general formula [I], R ¹ and R ² may be different bite other are identical to each other, are each 5 or more carbon atoms of the hydrocarbon group, R ³

H

Is a divalent hydrocarbon group having 1 to C5 carbon atoms, R ⁴ is a hydrogen atom or a carbon cohydrogen group having 1 to 20 carbon atoms, and n is an integer of 0 to 10. 0.02% to 4% by weight of a compound represented by the formula:

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates and phosphonates; 0.02% by weight to 5% by weight

A lubricating oil composition for an automatic transmission, comprising:

(a) General formula [I]

R ^1. 0 0 .R ²

\ II II z

HC-C C-CH

. /

N Chi R ³ -NR ³ -N [I]

R 'n C-CH _:

II

0

(In the general formula [I], R ¹ and R ² may be the same or different from each other, each is a hydrocarbon group having 5 or more carbon atoms, and R ³ is a divalent group having 1 to 5 carbon atoms. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and n is an integer of 0 to 10.) A compound represented by the following formula: 0.02% by weight to 4% weight%,

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates and phosphonates; from 0.02% to 5% by weight; and

(c) at least one compound selected from the group consisting of phosphate, acid phosphate, phosphite, and acid phosphite 0.01% by weight to 5% by weight Can be provided. According to the present invention,

A method for lubricating an automatic transmission using a lubricating oil composition for an automatic transmission containing the compound represented by the general formula [I] can be provided.

Further, according to the present invention,

An object of the present invention is to provide an automatic transmission filled with a lubricating oil composition for an automatic transmission containing the compound represented by the general formula [I].

The specificity of the present invention is characterized in that R ¹ and R ² of the imid compound represented by the general formula [I] are each a linear hydrocarbon group having 5 or more carbon atoms. The effect of a friction modifier, which could not be recognized in the past, was to improve the anti-shudder vibration performance without lowering the transmission torque capacity of lubricating oil for automatic transmissions. We have focused on what can be improved. BEST MODE FOR CARRYING OUT THE INVENTION

The base oil of the lubricating oil composition for an automatic transmission according to the present invention is not particularly limited, and any oil that is generally used as a lubricating oil base oil can be used. Any of these can be used.

Mineral base oils include solvent-refined raffinates and lubricating oil raw materials obtained by treating lubricating oil raw materials obtained by atmospheric distillation and vacuum distillation of crude oils with aromatic extraction solvents such as phenol, furfural, and N-methylpyrrolidone. A hydrogenated oil obtained by contacting hydrogen with hydrogen under hydrotreating conditions in the presence of a hydrotreating catalyst, and a hydrogenated oil obtained by contacting PEX with hydrogen under isomerizing conditions in the presence of a catalyst for isomerizing. The isomerized oil obtained or a mixed oil thereof can be used. The lubricating oil-mixed base material can usually be produced by arbitrarily combining a solvent refining process, a hydrogenation process, an isomerization process, and the like. A purification step such as a white clay treatment step can be optionally employed. Mineral oil mixture Specific examples of the base material include light neutral oil, medium neutral oil, and heavy neutral oil bright stock.

Examples of the synthetic base oil include poly-α-olefin, α-olefin copolymer, polybutene, alkylbenzene, polyol ester, dibasic acid ester, polyoxyalkylene glycol, polyoxyalkylene glycol ester and polyoxyalkylene glycol. Examples include alkylene glycol ethers and silicone oils.

Synthesize one or more mineral oils or mineral oils, such as two or more mineral oils or mineral oils, in order to satisfy the required quality including the kinematic viscosity required for automatic transmission lubricating oils. A desired lubricating base oil can be prepared by appropriately mixing oil and the like. The lubricating base oil of the present invention has a kinematic viscosity at 100 ° C. of usually 2 mm ² / s to 20 mm ² / s, preferably 3 mm ² / s to 15 mm ² Zs. Those having the following can be used. If the viscosity of the lubricating base oil is too high, its low-temperature viscosity properties will be reduced.On the other hand, if the viscosity is too low, wear on the sliding parts of the gear bearing mechanism, clutch, etc. of the automatic transmission may increase. There is.

The imide compound used in the lubricating oil composition for an automatic transmission of the present invention has the following general formula [I]

R ¹ R:

[I]

It is a compound represented by these.

In the above general formula [I], R ¹ and R ² may be the same or different from each other, and each is a saturated or unsaturated hydrocarbon group having 5 or more carbon atoms, preferably 5 to 40 carbon atoms. Examples of the hydrocarbon group include pentyl, hexyl, heptyl, octyl, nonyl, and decyl , Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, oleyl group, and other hydrocarbon groups having up to 40 carbon atoms. it can. Particularly, preferred hydrocarbon groups include straight-chain hydrocarbon groups having 8 to 25 carbon atoms. When the number of carbon atoms of the hydrocarbon group is 4 or less, there is a possibility that the performance of preventing the vibration from shudder is reduced and a lubricating oil composition having sufficiently practical value as a lubricating oil for an automatic transmission may not be provided. .

In the general formula [I], R ³ is a divalent hydrocarbon group having 1 to 5 carbon atoms, preferably an alkylene group having 2 to 3 carbon atoms.

In the above general formula [I], R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms. As the hydrocarbon group, an alkyl group having 1 to 20 carbon atoms

An alkenyl group having 2 to 20 carbon atoms; a cycloalkyl group having 6 to 20 carbon atoms

An aryl group having 6 to 20 carbon atoms, and an aryl group having 1 to

It may have 12 alkyl groups. R ₄ is particularly preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. As the above hydrocarbon group

In the structure, there are several amino groups or amide bonds and both,

Each having about 1 to 5 can be used.

An amino group is represented by one NH— or one NH ₂ , and the amide bond is

0

II

Represented by one C-N- and bonded at any position to the carbon atom of the hydrocarbon group

I

Things are fine.

In the above general formula [I], n is an integer of 1 to 10, preferably 1 to 5.

According to the present invention, as the compound of the general formula [I], specifically, a compound represented by the following general formula [II] is particularly preferable. R ^1. 0

\ II

HC-C

: N CH ₂ -CH ₂ -N CH ₂ -CH ₂ -N [II] n \

H ₂ CC C-CH ₂

II II

0 0

In the above general formula [], R ¹ and R ² each have 8 carbon atoms.

25 is a linear hydrocarbon group, R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond. , N ;! ~ 5.

The imid compound of the present invention is added in an effective amount to the base oil of the lubricating oil composition for an automatic transmission. The effective amount of the imid compound varies depending on the components and properties of the base oil, but is preferably 0.02% to 4% by weight, preferably 0.03% by weight based on the total weight of the lubricating oil composition. 3% by weight can be used co =

You.

c z

The above-mentioned imid compound is composed of hydrocarbon-substituted succinic anhydride and polyamine

R

Can be synthesized by the reaction with Examples of preferred polyamines for the synthesis include monodiamines such as ethylenediamine, propylenediamine, butylenediamine and pentylenediamine, and polyalkylenepolyamines such as diethylenetriamine, triethylenetetramine and tetraethylenepentamine. it can.

The lubricating oil composition for an automatic transmission according to the present invention contains the imide compound represented by the above general formula [I] as an essential component, so that when used as an automatic transmission oil, the transmission torque capacity is reduced. Without lowering, the performance of preventing shudder vibration is improved, and it has a remarkable effect especially in preventing shudder vibration of an automatic transmission with a slip control mechanism. Further, by adding a metal salt of an organic acid and / or a phosphorus-based compound and combining it with an imid-based compound, it is possible to further improve the performance of preventing shudder vibration.

Organic acid metal salts include sulfonates, phenates, salicylates and the like. And phosphonates. The metal component of the organic acid metal salt is preferably an alkaline earth metal, for example, calcium, magnesium, norium and the like. Specific examples of the organic acid metal salt include calcium sulfonate, phenate, salicylate and phosphonate, and magnesium sulfonate, phenate, salicylate and phosphonet. Sulfonate, phenate, salicylate and phosphonate have a hydrocarbon group, and at least one of the hydrocarbon groups is preferably a relatively long chain having 6 or more carbon atoms. For example, a linear or branched alkyl group having 6 to 18 carbon atoms; a linear or branched alkenyl group having 6 to 18 carbon atoms; a cycloalkyl group having 6 to 18 carbon atoms; An aryl group of 8 or the like can be used, and the aryl group may have an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms as a substituent. Among the above hydrocarbon groups, a preferred hydrocarbon group is an alkyl group having 6 to 18 carbon atoms, and an alkyl group having 8 to 12 carbon atoms is particularly preferred from the viewpoint of improving the transfer torque capacity. Specific examples of the sulfone include alkyl benzene sulfonates, for example, hexyl benzene sulfonate, hexadecyl toluene sulfonate, hexadecyl xylene sulfonate, octadecyl benzene sulfonate, dodecyl benzene sulfonate Salt and the like can be mentioned, and calcium and magnesium are preferable as the metal component. The salicylate preferably has an alkyl group having 10 to 14 carbon atoms, and specific examples thereof include dodecylzalicylate. Calcium and magnesium are preferred as metal components. The phenolate is preferably a metal salt of an alkylphenol or a sulfurized alkylphenol, such as a calcium salt of dodecylphenol or dodecylphenol sulfide. Phosphonate is a metal salt of phosphonic acid or thiophosphonic acid obtained by reacting polyolefin with phosphorus pentasulfide, and calcium and magnesium are used as metal components. These organic acid metal salts preferably have a total base number of 1 O mg KOHZ g to 400 mg KOH / g. The organic metal salt of sulfonate, phenate, salicylate and phosphonate is contained in an amount of from 0.02% to 5% by weight, preferably from 0.1% to 2% by weight, based on the total weight of the lubricating oil composition. It is effective to mix them.

These organic acid metal salts may be those produced by a known method, and commercially available products may be selected and used.

Examples of the phosphorus compound include a phosphoric acid ester, an acidic phosphoric acid ester, a phosphite, an acidic phosphite, zinc thiophosphate, etc., and represented by the general formulas [III], [IV] And those represented by [V] can be used.

(R ⁵ — 0-) — P

ノ 3 [I I I]

0

(R ^c 0 P [IV]

\ (0H) 3, _- x

(R ⁵ — 0) _y \ 0

P [V]

In (H0) ₂ _ _y \ H above general formula [III] ~ [V], R 5 is a carbon hydrocarbon radical or a sulfur atom-containing hydrocarbon group having 1 to 30 carbon atoms, the same or in each of the general formula It may be different. X is 1, 2 or 3, and y is 1 or 2. Preferred hydrocarbon groups are alkyl groups having 1 to 30 carbon atoms; alkenyl groups having 2 to 30 carbon atoms; cycloalkyl groups having 6 to 30 carbon atoms; aryl groups having 6 to 30 carbon atoms, alkylaryl groups, and arylalkyl groups. It is. Particularly preferred hydrocarbon groups are linear or branched alkyl groups having 3 to 24 carbon atoms.

Specifically, triphosphates and the like are used as phosphate esters. Yes, for example, benzyl diphenyl phosphate, aryl diphenyl phosphate, triphenyl phosphate, tricresyl phosphate, ethyl diphenyl phosphate, tributyl phosphate, dibutyl phosphate, cresyl diphenyl phosphate, Dicresyl phenyl phosphate, ethyl phenyl diphenyl phosphate, dimethyl phenyl phosphate, propyl phenyl diphenyl phosphate, diphenyl phenyl phenyl phosphate, triethyl phenyl phosphate, triethyl phenyl phosphate, Tripropyl phenyl phosphate, butyl phenyl diphenyl phosphate, dibutyl phenyl phenyl phosphate, tributyl phenyl phosphate, propyl phenyl phenyl phosphate mixture, Can be exemplified chill off We sulfonyl Tilia sulfonyl phosphite Tilia compounds such as one bets mixture. Of these compounds, phosphites having an alkyl group having 3 to 10 carbon atoms are preferred.

Examples of the acidic phosphoric acid ester include monobutyl phosphate, monohexyl phosphate, monooctyl phosphate, monolauryl phosphate, monophenyl phosphate, dibutyl phosphate, dioctyl phosphate, and di (2-ethylhexyl) phosphate. And didecyl phosphate, dilauryl phosphate, dioleyl phosphate, distearyl phosphate, diphenyl phosphate and the like. Among these, a mono- or dialkyl phosphite having an alkyl group having 3 to 10 carbon atoms or a mixture thereof is preferable.

Examples of phosphites include triphenyl phosphite, tri (P-cresyl) phosphite, tris (nonyl phenyl) phosphite, trioctyl phosphite and triisooctyl phosphite. And diphenyl isodecyl phosphite, phenyl isodecyl phosphite, triisodecyl phosphite, tristearyl phosphite, trioleyl phosphite and the like.

Acid phosphites include, for example, di-2-ethylhexylhydrogen phosphite, dilauryl hydrogen phosphite, Georail Hydrogen Phosphite and the like.

Examples of the sulfur atom-containing hydrocarbon group include a dodecylthioethyl group.

The above-mentioned phosphorus compound is present in an amount of 0.01 to 5% by weight, preferably 0.03 to 3% by weight, based on the total weight of the lubricating oil composition, based on the lubricating oil base oil. It is compounded by. A particularly preferred amount is in the range of 0.05% by weight to 1% by weight.

The phosphorus compound may be one obtained by a usual production method, and a commercially available product can be selected and used.

Further, the lubricating oil composition for an automatic transmission according to the present invention may further contain, if necessary, other additives such as other friction modifiers, antiwear agents, viscosity index improvers, ashless dispersants, and antioxidants. An extreme pressure agent, a metal deactivator, a pour point depressant, an antifoaming agent, a corrosion inhibitor and the like can be added as appropriate.

As the viscosity index improver, for example, polymethacrylate-based, polyisobutylene-based, ethylene-propylene copolymer-based, styrene-butadiene hydrogenated copolymer and the like can be used, and these are 3% by weight to 35% by weight. Used in proportions.

Examples of the ashless dispersant include polybutenyl succinic acid imid type, polybutenyl succinic acid imid type, benzylamine type, and succinic ester type. These are 0.05% to 7% by weight. Used in proportions.

Examples of the antioxidant include amide-based antioxidants such as alkylated difuunilamine, phenyl α-naphthylamine, alkylated phenyl-α-naphthylamine, 2,6-ditertiarybutylphenol, and 4,4′-methylenebis-monoamine. Examples thereof include phenolic antioxidants such as (2,6-di-tert-butylphenol) and zinc dithiophosphate, which are used in a proportion of 0.05% by weight to 5% by weight. . Examples of extreme pressure agents include dibenzyl sulfide and dibutyl disulfide, which are used at a rate of 0.05% to 3% by weight. Is done.

Examples of the metal deactivator include benzotriazole, thiadiazole, etc., which are used in a proportion of 0.1% to 3% by weight o

Pour point depressants include, for example, ethylene-vinyl acetate copolymer, condensates of chlorinated balafins with naphthalene, condensates of chlorinated paraffins with phenol, polymethacrylates, polyalkylstyrenes, etc. These are used in a ratio of 0.1% by weight to 10% by weight. Further, other additives such as a corrosion inhibitor and an antifoaming agent can be used as long as the object of the present invention is not impaired.

The amounts of the above various additives are as follows. Formulation:%) Preferred Formulation;%) Viscosity Index Improver 3 35 4'30

Ashless dispersant 0.05 7 0. 1 '5

Antioxidant 0. 05 5 0. 1 '3

Extreme pressure agent 0. 05 3 0. 1 '2

Metal deactivator 0.01 3 0.01 '2

Pour point depressant 0.1 1 10 0.5 '8

Corrosion inhibitor 0.01 '5

Antifoaming agent 0.0001 ′ 1 Next, preferred embodiments (1) to (13) of the lubricating oil composition of the present invention will be described below.

(1) In a lubricating base oil, based on the total weight of the composition,

General formula [I] ΙΓ

(In the above general formula [I], R ¹ and R ² may be the same or different from each other, each is a hydrocarbon group having 5 to 40 carbon atoms, and R ³ is a hydrocarbon group having 1 to 5 carbon atoms. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond; A lubricating oil composition for an automatic transmission, comprising an effective amount of a compound represented by the formula:

(2) Lubricant base oil, based on the total weight of the composition,

(a) General formula [I]

(In the above general formula [I], R ¹ and R ² may be the same or different from each other, each is a hydrocarbon group having 5 to 40 carbon atoms, and R ³ is a hydrocarbon group having 1 to 5 carbon atoms. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group may have an amino group and a Z or amide bond; A compound represented by the formula: 0.02% to 4% by weight;

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates and phosphonates 0.02% by weight to 5% by weight (3) Lubricating base oil, based on the total weight of the composition. (A) — General formula [I]

(In the general formula [I], R ¹ and R ² may be the same or different from each other, and may be H, each having 8 to 25 carbon atoms and having no branch, and C and R ³ are A divalent hydrocarbon group having 2 to 5 carbon atoms, R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group has an amino group and a no or amide bond; N may be an integer from 0 to 10.

A lubricating oil composition for an automatic transmission comprising an effective amount of a compound represented by the formula: (5) a lubricating base oil, based on the total weight of the composition,

(a) — General formula [I]

R ^1. 0 R ²

\ II

HC-C

NR [I]

(In the formula [I], bite the other R ¹ and R ² are identical to each other may be different, are each a straight-chain hydrocarbon group having no branching carbon atoms 8 to 2 5, R ³ Is a divalent hydrocarbon group having 2 to 5 carbon atoms, R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group has an amino group and / or an amide bond. And n is an integer from 0 to 10.

From 0.02% by weight to 2% by weight and

A lubricating oil composition for an automatic transmission, comprising

(6) Lubricant base oil, based on the total weight of the composition,

(a) — General formula [I] R

R

(In the above general formula [I], R ¹ and R ² may be the same or different from each other, each is a straight-chain hydrocarbon group having 825 carbon atoms and having no branch, and R ³ is A divalent hydrocarbon group having 25 carbon atoms, R ⁴ is a hydrogen atom or a hydrocarbon group having 120 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond; , N is an integer of 0 10.)

0.02% by weight to 2% by weight of a compound represented by

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates and phosphonates; 0.02% by weight 5% by weight;

(c) at least one compound selected from the group consisting of phosphate, acid phosphate, phosphite, and acid phosphite 0.01% by weight to 5% by weight

A lubricating oil composition for an automatic transmission, comprising

(7) For lubricating base oil,

General formula [I]

(In the above general formula [I], R ¹ and R ² are the same as each other. R ³ is a divalent hydrocarbon group having 2 to 5 carbon atoms, each of which is a straight-chain unsaturated hydrocarbon group having 8 to 25 carbon atoms and having no branch. ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group may have an amino group and a amino or amide bond, and n is an integer of 0 to 10. )

(8) A lubricating oil composition for an automatic transmission comprising an effective amount of a compound represented by the following formula:

(a) — General formula [I]

R

(In the above general formula [I], R ¹ and R ² may be the same or different from each other, and each is a straight-chain unsaturated hydrocarbon group having 8 to 25 carbon atoms and having no branch; ³ is a divalent hydrocarbon group having 2 to 5 carbon atoms, R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group has an amino group and / or an amide bond. N may be an integer from 0 to 10.

0.02% to 2% by weight of the compound represented by

A lubricating oil composition for an automatic transmission, comprising

(9) In the lubricating base oil, based on the total weight of the composition,

(a) General formula [I] 9

R 0 0 No R:

\ II II z

HC-C C-CH

N na R ³ ― NR ³ -N [I]

H ₂ CC V n C-CH ₂

II II

0 0

(In the general formula [I], R ¹ and R ² may be the same or different from each other, and each is a straight-chain unsaturated hydrocarbon group having 8 to 25 carbon atoms and having no branch, R ³ is a divalent hydrocarbon group having 2 to 5 carbon atoms, R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the hydrocarbon group is an amino group and a di- or amide group. It may have a bond, and n is an integer of 0 to 10.)

0.02% by weight to 2% by weight of a compound represented by

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates, and phosphonates;

(c) at least one compound selected from the group consisting of phosphate, acid phosphate, phosphite and acid phosphite 0.01% by weight to 5% by weight

A lubricating oil composition for an automatic transmission, comprising

(10) In lubricating base oil,

General formula [II]

R ¹

[II]

(In the general formula [II], R ¹ and R ² are the same as each other. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, wherein R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms. The group may have an amino group and / or an amide bond, and n is an integer of 1-5. )

A lubricating oil composition for an automatic transmission comprising an imid compound represented by the formula: (11) a lubricating base oil, based on the total weight of the composition,

(a) General formula [II]

R no R:

z

-CH

[II]

(In the general formula [II], R ¹ and R ² may be the same as or different from each other, and are an unbranched H straight-chain hydrocarbon group having 8 to 25 carbon atoms. ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond, and n is an integer of from! is there. )

0.02% by weight to 4% by weight of an imid compound represented by the formula: and (b) at least one metal salt of an organic acid selected from the group consisting of sulfonate, phenate, salicylate and phosphonate 0.02% by weight to 5% by weight

A lubricating oil composition for an automatic transmission, comprising

(1 2) In the lubricating base oil, based on the total weight of the composition,

(a) — General formula [II] RR ²

[II]

(In the general formula [II], R ¹ and R ² may be the same or different from each other, are a straight-chain hydrocarbon group having 8 to 25 carbon atoms and having no branch, and R ⁴ is a hydrogen atom. Or a hydrocarbon group having 1 to 10 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond, and n is an integer of from!

0.02% by weight to 4% by weight of an imid compound represented by

(b) at least one metal salt of an organic acid selected from the group consisting of sulfonates, phenates, salicylates and phosphonates; 0.02% by weight;

~ 5% by weight and

Or a lubricating oil composition for an automatic transmission comprising

(13) The lubricating base oil contains the compound represented by the general formula [I] and the metal salt of an organic acid and / or a phosphorus compound, and further has an anti-wear agent and an improved viscosity index. Ashless dispersant, antioxidant, metal deactivator, corrosion inhibitor, antifoaming agent, and at least one additive selected from the group consisting of additives required for lubricating oil compositions for automatic transmissions Oil composition for automatic transmissions containing

Can be provided.

More specifically, a solvent refined paraffinic mineral oil having a kinematic viscosity of 4 mm ² Zs at 100 was used as a lubricating base oil, and based on the total weight of the lubricating oil composition, an imid compound (compound A) was used. 0.5 to 2% by weight

• Organic acid metal salt (calcium sulfonate) 0.1 to 0.5% by weight • Phosphorus compound (trialkyl phosphate) 0.1 to 0.5% by weight • Polymethacrylate 2 to 1Q% by weight • Polybutenyl succinate imide 2 to 5% by weight-2,6-di-t-butyl 4 monomethylphenol 0.2-1% by weight and

Provided is a lubricating oil composition for an automatic transmission, which contains 0.02 to 0.1% of benzotriazole.

[Example]

Hereinafter, 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 and the like.

The shudder vibration prevention performance and transmission torque capacity were evaluated by the following measurement methods.

(1) Anti-vibration performance

LVFA the (L ow V elocity F riction Ap paratus) used as a tester, a mu _H and ML in the following experimental conditions were each measured to calculate the mu _Eta / mu ratio.

Test condition

• Friction material: SD-1777

• Oil amount: 100 c c

• Oil temperature: 80 ° C

'Surface pressure: l O kgf Zc m ²

The _μ Η · · · relative slip speed 1. Friction coefficient UHM _l ratio in friction coefficient ML · · · relative slip velocity 0. 5 ms in 5 ms and shudder one antivibration performance index criteria shudder one antivibration effect And If μ _Η UL ratio (Shaguh anti-vibration performance index)> 1, shudder will not occur in the actual machine.

(2) Transfer torque capacity

Using a SAE No. 2 friction tester as a tester, perform a dynamic test and a static test under the following conditions. • Friction material: SD-1777, 3 pieces

• Oil volume: 800 c c

'Oil temperature: 100. C

'Surface pressure: S kgf Zc m ²

[D y n a m i e expression test]

The friction material is rotated at 3600 rpm with an inertial weight of 3.5 kgf · cm · s ² without load, and pressure is applied so that the friction material is sandwiched between steel plates, and the rotation is stopped.

[Sta tic test]

Pressure is applied so that the friction material is sandwiched between steel plates, the friction material is rotated at a rotation speed of 0.72 rpm, and the rotational torque generated at that time is read and converted to a friction coefficient. Measure the static friction coefficient μs at the maximum torque that starts sliding at low speed.

The transmission torque capacity is evaluated based on the static friction coefficient s at 100 c / c in SA EN No. 2 test. The higher the s is over 0.100, the higher the transmission torque capacity is evaluated.

Table 1 shows the composition of the imide compound of the present invention (compounds Α to Η) and the imide compound (compounds I to J) used for comparison, and the base oils used in Examples and Comparative Examples are shown in Table 1. Tables 2 to 4 summarize the additive composition and the performance evaluation of the lubricating oil composition.

Example 1

Solvent-refined paraffinic mineral oil (kinematic viscosity at 100 ° C; 4 mm ² / s) was used as the lubricating base oil. Imide-based compound (Compound A) 1.0% by weight, calcium sulfonate (total base) Value 300 mg K 0 H / g) 0.3% by weight, tributyl phosphate 0.2% by weight, polymethacrylate (viscosity index improver) 5.0% by weight, polyisobutenyl succinic acid imid (none Ash dispersant) 4.0% by weight, 2.6-di-tert-butyl-4-methylphenol (antioxidant) 0.4% by weight and benzotriazole (metal deactivator) 0.05% by weight A lubricating oil composition containing was prepared. Used here As shown in Table 4, in compound A, R ¹ and R ² are each a linear alkyl group having 12 carbon atoms, R ³ is an alkylene group having 2 carbon atoms, R ⁴ is a hydrogen atom, and n is It is an imid compound of 2. The resulting lubricating oil composition was measured for its anti-shudder vibration performance and transmitted torque capacity, and the following results were obtained.

- shudder one antivibration performance index _(μ Η / L ratio in LVFA): 1.06

• Transmission torque capacity (Static friction coefficient (s) at 100 c / c in SAE No.2 test: 0.146) According to the above evaluation results, the Shader-One-vibration prevention performance index 1.06 exceeds 1.00, and the transmission torque capacity Since the value of 0.146 exceeds 0.100, it can be understood that the power transmission performance is extremely excellent.

As the lubricating base oil, α-olefin copolymer-based synthetic oil (kinematic viscosity at 100 ° C: 4 mm ² / s [SHF 41 by Mobile Oil Co., Ltd.]) was used instead of solvent-refined paraffinic mineral oil. In all other respects, a lubricating oil composition was prepared in the same manner as in Example 1. The performance index of shudder vibration prevention and transmission torque capacity were measured, and the results are shown in Table 1. Substantially equivalent results were obtained when compared to mineral base oils.

Examples 3 to 9

Compound A and various additives were added to the base oils shown in Table 1 at the ratios shown in the table to prepare lubricating oil compositions. In particular, as the phosphorus compound, triptyl phosphate (Example 3), tricresyl phosphate (Example 4), trioctyltrithiophosphate (Example 5), a mixture of monooctyl phosphate and dioctyl phosphate (1: 1) (Example 6) was used. The shudder vibration prevention performance and the transmission torque capacity of each of the obtained lubricating oil compositions were determined, and the results shown in Table 1 were obtained.

Example 10

A lubricating oil composition was prepared in the same manner as in Example 1 except that Compound B shown in Table 4 was used instead of Compound A as the imide compound. In the compound B, R ¹ and R ² are each a straight-chain alkyl group having 12 carbon atoms, R ³ is an ethylene group, R ⁴ is an alkyl group having 6 carbon atoms, and an —NH— group It is an imid compound in which _two — and three NH ₂ atoms are bonded. Also, n is 2. The lubricating oil composition was subjected to performance evaluation, and the results shown in Table 2 were obtained. Shada One-vibration prevention performance index (μ _Η

Ratio) was 1.07, and the transmission torque capacity (s) was 0.146, which was an extremely good result.

Example 1 1

A lubricating oil composition was obtained under the same conditions and operations as in Example 1 except that compound C was used instead of compound として as the imide compound. As shown in Table 4, R ¹ and R ² are each a linear alkyl group having 18 carbon atoms, R ³ is an ethylene group, R ⁴ is a hydrogen atom, and n is 2 It is an imid compound. Table 2 shows the measurement results of the lubricating oil composition's shudder vibration prevention performance index ( _μΗL ratio) and transmission torque capacity (S).

Example 12: I 4

Example 1 was repeated except that Compound A (Example 12), Compound E (Example 13) and Compound F (Example 14) were used instead of Compound A as imid compounds. A lubricating oil composition was prepared in the same manner.

As shown in Table 4, in compound D, R ¹ and R ² each have a linear alkyl group having 18 carbon atoms, R ³ has an ethylene group, and R ⁴ has two amide bonds (one CO—N—). An alkyl group having one amino group (—NH—) and having 1 ◦ carbon atom, and n is 2;

Compound E is an imid compound in which R ¹ and R ² are each a linear alkyl group having 24 carbon atoms, R ³ is an ethylene group, R ⁴ is a hydrogen atom, and n is 2.

Compound F is an imid compound in which R ¹ and R ² are each a linear alkyl group having 8 carbon atoms, R ³ is an ethylene group, R ⁴ is a hydrogen atom, and n is 2.

Examples 15 to; I 6

As an imid compound, compound G (Example 15) instead of compound A A lubricating oil composition was prepared in the same manner as in Example 1 except that Compound H and Compound H (Example 16) were used. As shown in Table 4, compounds G and H are imid compounds in which R ¹ and R ² each have a linear unsaturated hydrocarbon group. Table 3 shows the evaluation results.

Examples 17 to L9

A lubricating oil composition was prepared using Compound G as the imide compound and using acid phosphate and acid phosphite in the proportions shown in Table 3 in place of the phosphate. Table 3 shows the results of the composition and performance evaluation (shudder vibration prevention performance and transmission torque capacity).

Comparative Examples 1 to 14

The lubricating oil composition was prepared by mixing the base oils shown in Table 3 and various additives in the proportions shown in the same table. For each composition, the shudder vibration prevention performance index ( _μΗL ratio) and the transmitted torque capacity were determined, and the results are shown in Table 3.

In the compound I used in Comparative Example 12, R ¹ and R ² are each an n-butyl group having 4 carbon atoms, R ³ is an ethylene group, R ⁴ is a hydrogen atom, and n is 2 It is a compound of the type.

In the compound J of Comparative Example 14, R ¹ is a straight-chain alkyl group having 12 carbon atoms, whereas R ² is a cyclic hydrocarbon group and is not a straight-chain saturated hydrocarbon group. It is an imid compound containing a hydrocarbon group.

From the above Examples and Comparative Examples, it has been clarified that the use of the novel imide-based compound according to the present invention can satisfy all of the anti-vibration performance and the transmission torque capacity. In Comparative Example 12, Compound I was used as the imid compound, and R ¹ and R ² were each an n-butyl group having 4 carbon atoms, and were substituted with the hydrocarbon group having 5 or more carbon atoms of the present invention. Not applicable. In Comparative Example 13, polyisobutenyl succinic acid imide (bis type) was added as an ashless detergent and dispersant by 2% by weight as compared with the other Examples and Comparative Examples. However, the polyisobutenyl group of the polyisobutenyl succinic acid imide used here is different from the straight-chain hydrocarbon group having 5 or more carbon atoms and having no branch in the present invention. Yes, no improvement in shudder vibration prevention performance.

The anti-shudder vibration index of the lubricating oil composition of Comparative Example 14 using Compound J was reduced to 0.94 and 1.00 or less, resulting in the lack of anti-shudder vibration prevention performance. Since R ^{2 of} compound J is a cyclic compound, if both R ¹ and R ² are not straight-chain hydrocarbons, they provide anti-shaddle vibration prevention performance while maintaining transmission torque capacity. It indicates that it is not possible.

R ¹ and R ² of the compound A~H is a linear alkyl group having 8 or more carbon atoms as shown in Table, shudder one antivibration performance without these lubricating oil composition using compromising torque capacity Has a remarkable effect.

Further, as understood from Comparative Examples 8 and 9, it was also found that the imid-based compound of the present invention has a content range in which a more remarkable effect can be exhibited.

table 1

* Compounds A to H are imid-based compounds according to the present invention, novel friction modifiers, and compounds I and J are compounds listed for comparison-

Table 2 t

C

* The content of the additives is indicated by% by weight based on the total weight of the composition.

Table 3

Table 4

* The content of additives is shown as% by weight based on the total mss of the products.

Industrial applicability

The lubricating oil composition for an automatic transmission according to the present invention comprises the above-mentioned imid compound in a lubricating base oil, and is an index of anti-shudder vibration prevention performance in an automatic transmission with a slip control mechanism. It can improve the slope of the μ-V curve, and even when the lock-up mechanism is operated in the low-speed range, it exhibits excellent anti-shudder vibration prevention performance without impairing the transmission torque capacity, and power transmission. Very useful as a fluid.

Further, according to the present invention, it is possible to provide a method of lubricating an automatic transmission with a slip control mechanism using the lubricating oil composition for an automatic transmission containing an imid-based compound. Further, it is possible to provide an automatic transmission equipped with a lock-up mechanism filled with a lubricating oil composition having a high transmission torque capacity and an excellent anti-shudder vibration prevention performance.

Claims

1. For lubricating base oil,

The following general formula [I]

(In the above general formula [I], R ¹ and R ² may be the same or different from each other, each is a hydrocarbon group having 5 or more carbon atoms, and R ³ is 2 to 5 carbon atoms. R ⁴ is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and n is an integer of 0 to 10.) An effective amount of a compound represented by the following formula: Lubricating oil composition for automatic transmission.

2. The lubricating oil composition for an automatic transmission according to claim 1, wherein the effective amount of the compound of the general formula [I] is 0.02 to 4% by weight based on the total weight of the lubricating oil composition. .

3. The lubricating oil composition for an automatic transmission according to claim ¹ , wherein in the general formula [I], R ¹ and R ² are each a hydrocarbon group having 5 to 40 carbon atoms.

4. In the general formula [I], R ¹ and R ² are each a straight-chain hydrocarbon group having 8 to 25 carbon atoms and having no branch, and R ³ is a divalent hydrocarbon having 2 to 5 carbon atoms. The lubricating oil composition for an automatic transmission according to claim 1, which is a base.

5. The lubricating oil composition for an automatic transmission according to claim 1, wherein in the general formula [I], R ⁴ is an amino group and a hydrocarbon group which may have Z or an amide bond.

6. The compound represented by the general formula [I] is represented by the following general formula [II]

R

(In the general formula [II], R ¹ and R ² may be the same or different from each other, are a straight-chain hydrocarbon group having 8 to 25 carbon atoms and having no branch, and R ⁴ is a hydrogen atom. Or a hydrocarbon group having 1 to 10 carbon atoms, and the hydrocarbon group may have an amino group and / or an amide bond, and n is an integer of 1 to 5.)

The lubricating oil composition for an automatic transmission according to claim 1, which is an imid compound represented by the formula:

7. The lubricating base oil and (a) a compound represented by the above general formula [I], further comprising (b) a sulfonate, a phenol, a salicylate, and a phosphonate based on the total weight of the lubricating oil composition. 2. The lubricating oil composition for an automatic transmission according to claim 1, comprising 0.02% by weight to 5% by weight of at least one selected metal salt of an organic acid.

8. The lubricating base oil and (a) the compound represented by the general formula [I], further comprising (b) sulfonate, phenol, salicylate and phosphonet based on the total weight of the lubricating oil composition. From 0.02% to 5% by weight of at least one metal salt of an organic acid selected from the group;

(c) 0.01% to 5% by weight of at least one phosphorus compound selected from the group consisting of phosphate esters, acidic phosphate esters, phosphite esters and acidic phosphite esters. A lubricating oil composition for an automatic transmission according to claim 1.

9. The compound represented by the general formula [I] is added to the lubricating base oil to the organic acid. It contains a metal salt and / or a phosphorus compound, and is used for anti-wear agents, viscosity index improvers, ashless dispersants, antioxidants, metal deactivators, corrosion inhibitors, defoamers and other automatic transmissions 2. The lubricating oil composition for an automatic transmission according to claim 1, wherein at least one additive selected from the group consisting of additives necessary for the lubricating oil composition is blended.

10. A method for lubricating an automatic transmission using the lubricating oil composition for an automatic transmission according to claim 1.

11. An automatic transmission filled with the lubricating oil composition for an automatic transmission according to claim 1.