JP6533689B2 - Automatic transmission oil - Google Patents

Description

  The present invention relates to automatic transmission fluids.

In recent years, automatic transmissions having lock-up clutches have been widely used for the purpose of improving fuel consumption. However, in the lockup clutch, the μ-V characteristic between the paper disk and the metal plate is deteriorated due to the deterioration of the automatic transmission fluid, and self-induced vibration (judder) is easily generated. Therefore, in order to keep the so-called μ-V characteristics on a positive slope, the automatic transmission fluid is compounded with a friction modifier for reducing the friction coefficient in the low speed region.
With regard to the reduction of the friction coefficient in the low-speed range, a fluid composition for automatic transmissions has been proposed in which the shift feeling property is sustained over a long period of time by adding the N-substituted dialkanolamine to the viscosity-adjusted base oil. (See Patent Document 1).
On the other hand, a high clutch capacity is required for the lockup clutch and the transmission clutch in order to make the automatic transmission compact. For example, a power transmission oil has been proposed in which a primary amine is blended as an initial friction modifier, and a dialkanolamine is blended as a friction modifier that exhibits an effect over time (see Patent Document 2).
However, if the amount of the friction modifier is reduced to increase the clutch capacity, the judder life will be shortened. That is, increasing the judder life of the lockup clutch and increasing the clutch capacity of the lockup clutch and the shift clutch are in a trade-off relationship with automatic transmission fluid.
Under the circumstances, there has been proposed an automatic transmission oil composition in which a high clutch capacity and a long judder life are made compatible with a lockup clutch by blending a predetermined carboxylic acid glyceride (see Patent Document 3).

Unexamined-Japanese-Patent No. 1-259096 JP 2001-515099 JP 2003-82375 A

  However, even with the automatic transmission oil composition disclosed in Patent Document 3, it is not possible to sufficiently achieve both a high clutch capacity and a long judder life with respect to the lockup clutch.

  An object of the present invention is to provide an automatic transmission fluid capable of sufficiently achieving both a high clutch capacity and a long judder life with respect to a lockup clutch.

  In order to solve the above problems, the present invention provides a base oil comprising (A) two or more succinimides having an alkenyl group or an alkyl group and having different mass average molecular weights of the alkenyl group or the alkyl group, (B) A primary amine having a carbon chain having 12 to 24 carbon atoms, (C) an aliphatic amine alkylene oxide adduct having a carbon chain having 12 to 20 carbon atoms, and (D) an amide compound An automatic transmission fluid characterized by the above.

  The automatic transmission fluid of the present invention can sufficiently achieve both a high clutch capacity and a long judder life with respect to a lockup clutch.

Hereinafter, the automatic transmission fluid (it is also called "this transmission fluid") which is one embodiment of the present invention is explained in detail.
In the automatic transmission fluid of the present invention, not only that each component is blended but also "a component containing each component" is a modified product in which the component is modified instead of "at least any component of each component". And “containing a reaction product obtained by reacting any two or more components of each component” are also included.

[Base oil]
There is no restriction | limiting in particular as a base oil used for this transmission oil, Either mineral oil or a synthetic oil may be sufficient. As mineral oil, so-called highly refined mineral oil is preferable, for example, distillate obtained by atmospheric distillation of paraffin-based crude oil, intermediate crude oil or naphthenic crude oil, or distillation of residual oil under atmospheric pressure. And a deep dewaxed oil obtained by further deep dewaxing treatment after the purification, and further a hydrogenated oil obtained by hydrotreating and the like. There is no particular limitation on the purification method at that time, and various methods can be used. The mineral oil may be used alone or in combination of two or more.
Synthetic oils include, for example, alkylbenzenes, alkylnaphthalenes, poly-α-olefins, polyvinyl ethers, polyalkylene glycols, polycarbonates, and polyol esters. These synthetic oils may be used alone or in combination of two or more.
Mineral oil and synthetic oil may be used in combination. In addition, the 100 ° C. dynamic viscosity of the base oil is preferably 1.5 mm ² / s or more and 4 mm ² / s or less, more preferably 2.1 mm ² / s or more and 3.5 mm ² / s or less, 2.5 mm ² / s or more 3 mm ² / s or less is more preferable. When the 100 ° C. dynamic viscosity of the base oil is 1.5 mm ² / s or more, the wear on sliding parts such as gear bearings and clutches of the transmission can be reduced. In addition, the low temperature viscosity can be sufficiently lowered when the 100 ° C. dynamic viscosity of the base oil is 4 mm ² / s or less. The kinematic viscosity of the base oil at 100 ° C. may be measured in accordance with JIS K 2283 (2000).

[(A) component]
The component (A) used for the present transmission oil is an succinimide having two or more types having an alkenyl group or an alkyl group and having different mass average molecular weights of the alkenyl group or the alkyl group. The component (A) functions as a dispersant. However, using only one kind of succinimide can not sufficiently solve the problems of the present invention. As such succinimide, a succinate monoimide is preferable. For example, an alkenyl or alkyl succinimide as represented by the following general formula (1) is more preferable.

In the above formula (1), R ¹ is an alkenyl group or an alkyl group, and the mass average molecular weight is 800 or more and 1,500 or less.
When the mass average molecular weight of R ¹ described above is 800 or more, the clutch capacity can be maintained high, and the solubility in base oil is also improved. Further, when the weight average molecular weight of R ¹ is 1500 or less, with a judder life can be prolonged, thereby improving dispersibility.
As component (A), in particular, succinic acid monoimide (A1) having an alkenyl group or alkyl group having a mass average molecular weight of 1200 or more and 1,500 or less and an succinic acid having an alkenyl group or alkyl group having a mass average molecular weight of 800 or more and less than 1200. It is preferable to use an acid monoimide (A2) in combination. The mass average molecular weight of the alkenyl group or alkyl group in the component (A1) is 1250 or more and 1450 or less, and more preferably 1300 or more and 1400 or less. Further, the mass average molecular weight of the alkenyl group or the alkyl group in the component (A2) is preferably 850 or more and 1150 or less, and more preferably 900 or more and 1100 or less.
By combining the (A1) component and the (A2) component and further blending the (B) component, the (C) component, and the (D) component to be described later, a high clutch capacity and a long judder life of the lockup clutch can be further enhanced. It becomes possible to make it fully compatible.

Wherein R ² is an alkylene group, each of preferable number of carbon atoms is 2 to 5. m is an integer but is preferably 1 or more and 10 or less, more preferably 2 or more and 5 or less, and still more preferably 3 or 4. When m is 1 or more, dispersibility is good, and when m is 10 or less, solubility in a base oil is good.

  Examples of the alkenyl group include polybutenyl group, polyisobutenyl group and ethylene-propylene copolymer, and examples of the alkyl group include those obtained by hydrogenating these. Suitable alkenyl groups include polybutenyl or polyisobutenyl groups. The polyisobutenyl group is preferably obtained as a mixture of 1-butene and isobutene or as a polymerized product of high purity isobutene. Moreover, as a representative example of a suitable alkyl group, what hydrogenated the polybutenyl group or the polyisobutenyl group is mentioned. These mass average molecular weights can be easily determined by GPC.

The above alkenyl or alkyl succinimide is generally reacted with a polyamine with an alkenyl succinic anhydride obtained by the reaction of a polyolefin and maleic anhydride, or an alkyl succinic anhydride obtained by hydrogenating the same. It can be manufactured by
As an olefin monomer which forms said polyolefin, although 1 type, or 2 or more types of C2-C8 alpha olefin can be mixed and used, it is used, The mixture of isobutene and butene-1 is used suitably be able to.
On the other hand, as polyamines, single diamines such as ethylenediamine, propylenediamine, butylenediamine and pentylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, di (methylethylene) triamine, dibutylenetriamine and triamine Mention may be made of butylene tetramine and polyalkylene polyamines such as pentapentyl hexamine.

[(B) component]
The component (B) in the present transmission oil is a primary amine having a carbon chain having 12 to 24 carbon atoms. In the present transmission fluid, component (B) functions as a friction modifier. If the carbon number of the carbon chain is 12 or more, the μ-V characteristics of the lockup clutch become good, and it becomes easy to dissolve in the base oil. Therefore, the carbon number of the carbon chain is preferably 14 or more, more preferably 16 or more. On the other hand, when the carbon number of the carbon chain is 24 or less, it becomes easy to satisfy both the shift clutch capacity and the μ-V characteristic of the lockup clutch. Therefore, the carbon number of the carbon chain is preferably 22 or less, more preferably 20 or less.

The primary amine of component (B) is preferably an aliphatic primary amine, and may be an alkylamine or an alkenylamine. The alkyl group and the alkenyl group may be linear or branched, but linear is preferable from the viewpoint of improving the μ-V characteristics of the lockup clutch.
As such an alkylamine or alkenylamine, for example, n-dodecylamine, n-tridecylamine, n-tetradecylamine, 2-methyl-n-tridecylamine, n-pentadecylamine, n-hexadecyl Amine, n-heptadecylamine, n-octadecylamine, isooctadecylamine, n-nonadecylamine, n-icosylamine, n-octadecenylamine, stearylamine, oleylamine and the like can be mentioned.

  The component (B) may form an amine salt with an acidic phosphoric acid ester or an acidic phosphorous acid ester. Examples of acidic phosphoric acid esters include 2-ethylhexyl acid phosphate, ethyl acid phosphate, butyl acid phosphate, oleyl acid phosphate, tetracosyl acid phosphate, isodecyl acid phosphate, lauryl acid phosphate, tridecyl acid phosphate, stearyl acid phosphate And isostearyl acid phosphate and the like. Moreover, as an acidic phosphite, for example, ethyl hydrogen phosphite, n-propyl hydrogen phosphite, n-butyl hydrogen phosphite, 2-ethylhexyl hydrogen phosphite, di-2-ethylhexyl hydrogen phos These include, for example, fight, dilauryl hydrogen phosphite, and dioleyl hydrogen phosphite.

[(C) component]
The component (C) in the present transmission oil is an aliphatic amine alkylene oxide adduct having a carbon chain having 12 to 20 carbon atoms. In the present transmission fluid, the component (C) functions as a friction modifier.
The component (C) is obtained by adding an alkylene oxide to an aliphatic amine having a carbon chain having 12 to 20 carbon atoms in a conventional manner. The above-mentioned aliphatic amine is preferably a primary amine, and may be linear or branched, and may be saturated or unsaturated.
Specific examples of the above-mentioned primary amines include n-dodecylamine, n-tridecylamine, n-tetradecylamine, 2-methyl-n-tridecylamine, n-pentadecylamine, n-hexadecylamine, Examples thereof include n-heptadecylamine, n-octadecylamine, isooctadecylamine, n-nonadecylamine, n-icosylamine, n-octadecenylamine, stearylamine and oleylamine. As the primary amine, one type may be used, or a mixture of any two or more types may be used. As a mixture of two or more types, fatty primary amines derived from animal and vegetable oils such as beef tallow amine, hardened beef tallow amine, coconut oil amine, palm oil amine and soybean oil amine can be mentioned. It is desirable that these primary amines be purified by distillation.

  Alkylene oxides having 2 to 4 carbon atoms (EO: ethylene oxide, PO: propylene oxide, and BO: butylene oxide) are preferable from the viewpoint of easy addition reaction as an alkylene oxide in the present transmission oil and being easily obtained. Particularly preferred from the viewpoint of the μ-V characteristic of the lockup clutch is EO. The alkylene oxide having 2 to 4 carbon atoms can be used singly or in combination of two or more optionally, and when two or more alkylene oxides are used, even if they are added in block form, they are random It may be added to

[(D) component]
The component (D) used for the present transmission oil is an amide compound. Component (D) in the present transmission oil functions as a friction modifier.
The amide compound as the component (D) is preferably an amide of an aliphatic carboxylic acid, and the aliphatic group is preferably an alkyl group or an alkenyl group. It is preferable that carbon number of this alkyl group or an alkenyl group is 12 or more and 20 or less from a viewpoint of a friction coefficient. As such (D) component, stearic acid amide, isostearic acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, oleic acid amide etc. are mentioned, for example. In addition, these amide compounds may be used individually by 1 type, and may be used combining 2 or more types arbitrarily.

[This transmission fluid]
The present transmission oil is obtained by blending the above-mentioned component (A), component (B), component (C) and component (D) with the base oil, so the judder life of the lockup clutch is maintained long. It is possible to maintain a higher shift clutch capacity.

The blending amount of the component (A) is preferably 4.5% by mass or more and 6% by mass or less, and more preferably 4.75% by mass or more and 5.75% by mass or less, based on the transmission oil as a standard. It is more preferable that the content is not less than mass% and not more than 5.5 mass%. When the blending amount of the component (A) is in the above-described range, the judder life of the lockup clutch can be kept longer, and a higher shift clutch capacity can be maintained.
Moreover, succinic acid monoimide (A1) having an alkenyl group or alkyl group having a mass average molecular weight of 1200 to 1500 as component (A), and succinic acid monoimide having an alkenyl group or alkyl group having a mass average molecular weight of 800 to less than 1200. When using (A2), it is preferable that the compounding ratio of (A1) component is 50 mass% or more and 80 mass% or less on the basis of the total amount of (A1) component and said (A2) component, 55 mass% It is more preferable that it is 75 mass% or less. When the blend ratio of the (A1) component and the (A2) component is in this range, the judder life of the lockup clutch can be kept longer, and a higher shift clutch capacity can be maintained.

  About the compounding quantity of (B) component, 24 mass ppm or more and 235 mass ppm or less are preferable in nitrogen conversion amount in this transmission oil whole quantity standard from a viewpoint of μ-V characteristic improvement of a lockup clutch, 26 mass ppm or more and 226 mass ppm or less is more preferable, and 28 mass ppm or more and 210 mass ppm or less is more preferable.

About the compounding quantity of (C) component, 10 mass ppm or more and 320 mass ppm or less are preferable in nitrogen conversion amount in this transmission oil whole quantity standard from a viewpoint of μ-V characteristic improvement of a lockup clutch, 12 mass ppm or more 300 mass ppm or less is more preferable, and 14 mass ppm or more and 280 mass ppm or less is more preferable.
From the viewpoint of improving the μ-V characteristics of the lockup clutch, the compounding amount of the component (D) is preferably 62 mass ppm or more and 310 mass ppm or less, and 70 mass ppm or more and 300 mass ppm The following are more preferable, and 80 mass ppm or more and 290 mass ppm or less are more preferable.

As this transmission fluids, preferably 100 ° C. kinematic viscosity is less than 3.5 mm ² / s or more 10 mm ² / s, more preferably not more than ^{4 mm} 2 / s or more 8.5mm ² / s, 4. More preferably, it is 5 mm ² / s or more and 7.5 mm ² / s or less. The low temperature viscosity can be sufficiently lowered when the kinematic viscosity of the present transmission fluid is 10 mm ² / s or less. Further, when the 100 ° C. dynamic viscosity of the present transmission fluid is 3.5 mm ² / s or more, the wear on sliding parts such as the gear bearings and the clutch of the continuously variable transmission can be reduced. The 100 ° C. dynamic viscosity may be measured in accordance with JIS K 2283 (2000).
Because this transmission oil has a high clutch capacity (torque transmission capacity) and a long judder life, a belt type continuously variable transmission (push type, chain type) using a metal belt, or a toroidal type continuously variable transmission, etc. And can be suitably used for various continuously variable transmissions. The transmission oil is particularly suitable for a continuously variable transmission having a torque converter with a lockup clutch. In addition, the high clutch capacity of the transmission clutch and the long judder life of the lockup clutch are suitable for use in a stepped automatic transmission.

[(E) component]
It is preferable to further add a tertiary amine as the component (E) to the present transmission oil. By blending a tertiary amine, the friction coefficient in the low speed region can be further reduced. As the component (E), tertiary amines as represented by the following general formula (2) are preferable.
R ³ R ⁴ NR ⁵ (2)
Here, R ³ is a hydrocarbon group, preferably having a carbon number of 12 or more, more preferably 14 or more, and still more preferably 16 or more. When the carbon number is in the above range, the μ-V characteristic of the lockup clutch can be effectively improved. However, from the viewpoint of lowering the coefficient of friction, the carbon number of R ³ is preferably 28 or less, more preferably 24 or less, and still more preferably 20 or less.
Examples of such a hydrocarbon group include an alkyl group, an alkenyl group, an aryl group, and an aralkyl group. Among these hydrocarbon groups, aliphatic hydrocarbon groups are preferable, and those having a saturated structure are more preferable. Therefore, the R ^3, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, and a heneicosyl group, and docosyl group. Of these, octadecyl is most preferred.
The carbon chain portion may have a linear structure or a branched structure, but a linear structure is particularly preferable.

Each of R ⁴ and R ⁵ is a hydrocarbon group, and each carbon number is 4 or less. The preferred carbon numbers of R ⁴ and R ⁵ are each independently 1 or 2. Specifically, it is a methyl group, an ethyl group or a vinyl group. When the carbon number of R ⁴ and R ⁵ is in the above range, the anti-judder effect can be strongly exhibited. Further, in view of stability, a methyl group or an ethyl group is preferable to a vinyl group having an unsaturated structure. In addition, each terminal part of R ⁴ and R ⁵ may combine to form a ring.

Specific examples of the component (E) include dimethylhexadecylamine, dimethyloctadecylamine, dimethylhemeicosylamine, diethyloctadecylamine, and methylethyloctadecylamine. The tertiary amine as the component (E) to be blended in the present transmission oil may be used alone or in combination of two or more.
In addition, the content of nitrogen derived from the component (E) is preferably 10 mass ppm or more in terms of the total amount of nitrogen of the present transmission oil, from the viewpoint of both the anti-judder effect and the extended effect of judder life. It is more preferable that it is mass ppm or more, and it is further more preferable that it is 20 mass ppm or more. However, even if the compounding amount of the component (E) is too much, the effect of preventing the judder and the effect of extending the judder life are saturated, so the content of nitrogen resulting from the component (E) becomes 100 mass ppm or less It is desirable to limit the amount blended.

  The present transmission oil can further contain various additives. Examples of additives include viscosity index improvers, pour point depressants, antioxidants, oiling agents, extreme pressure agents, detergents and dispersants, rust inhibitors, metal deactivators and antifoam agents.

Examples of viscosity index improvers include polymethacrylates, dispersed polymethacrylates, olefin copolymers (eg, ethylene-propylene copolymer etc.), dispersed olefin copolymers, styrene copolymers (eg, styrene) Examples include diene copolymers, styrene-isoprene copolymers, and the like. The compounding amount of the viscosity index improver is about 0.5% by mass or more and 15% by mass or less based on the total amount of the transmission oil from the viewpoint of the compounding effect.
As the pour point depressant, for example, polymethacrylate having a mass average molecular weight of about 10,000 or more and about 150,000 or less is used. The preferable blending amount of the pour point depressant is about 0.01% by mass or more and 10% by mass or less based on the total amount of the transmission oil from the viewpoint of the blending effect.

  As the antioxidant, amine-based antioxidants, phenol-based antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants that are used in conventional hydrocarbon-based lubricating oils can be used. These antioxidants can be used singly or optionally in combination of two or more. Examples of amine-based antioxidants include monoalkyl diphenylamine compounds such as monooctyl diphenylamine and monononyl diphenylamine, 4,4-dibutyl diphenylamine, 4,4-dipentyl diphenylamine, 4,4-dihexyl diphenylamine, 4,4- Dialkyldiphenylamine compounds such as diheptyl diphenylamine, 4, 4-dioctyl diphenylamine, and 4, 4- dinonyl diphenylamine; polyalkyl diphenylamine compounds such as tetrabutyl diphenylamine, tetrahexyl diphenylamine, tetraoctyl diphenylamine, and tetranonyl diphenylamine; α-naphthylamine, phenyl-α-naphthylamine, butylphenyl-α-naphthylamine, pentyl fe Le -α- naphthylamine, hexylphenyl -α- naphthylamine, heptylphenyl -α- naphthylamine, naphthylamine compounds such as octylphenyl -α- naphthylamine and nonylphenyl -α- naphthylamine, and the like.

Examples of phenolic antioxidants include monophenolic compounds such as 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 4,4- Diphenolic compounds such as methylenebis (2,6-di-tert-butylphenol) and 2,2-methylenebis (4-ethyl-6-tert-butylphenol) can be mentioned.
Examples of sulfur-based antioxidants include 2,6-di-tert-butyl-4- (4,6-bis (octylthio) -1,3,5-triazin-2-ylamino) phenol, phosphorus pentasulfide and the like Examples thereof include thioterpene compounds such as a reaction product with pinene, and dialkylthiodipropionates such as dilaurylthiodipropionate and distearylthiodipropionate.
Examples of phosphorus-based antioxidants include triphenyl phosphite, diethyl [3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] phosphonate and the like.
From the point of blending effect, the blending amount of these antioxidants is preferably 0.01% by mass or more and 10% by mass or less, and more preferably 0.03% by mass or more and 5% by mass or less based on the whole transmission oil is there.

  Examples of the oil agent include fatty alcohols, fatty acid compounds such as fatty acids and fatty acid metal salts, polyol esters, ester compounds such as sorbitan esters and glycerides, and amine compounds such as aliphatic amines. The blending amount of these oil agents is preferably 0.1% by mass or more and 30% by mass or less, and more preferably 0.5% by mass or more and 10% by mass or less based on the total amount of the transmission oil from the viewpoint of compounding effect .

Extreme pressure agents include sulfur-based extreme pressure agents, phosphorus-based extreme pressure agents, extreme pressure agents containing sulfur and metals, and extreme pressure agents containing phosphorus and metals. These extreme pressure agents can be used singly or optionally in combination of two or more. The extreme pressure agent may be any one that contains at least one of a sulfur atom and a phosphorus atom in the molecule and can exhibit load resistance and wear resistance. The extreme pressure agent containing sulfur in the molecule includes, for example, sulfurized oil, sulfurized fatty acid, sulfurized ester, sulfurized olefin, dihydrocarbyl polysulfide, thiadiazole compound, alkylthiocarbamoyl compound, triazine compound, thioterpene compound, dialkylthiodipropionate compound, etc. Can be mentioned.
As an extreme pressure agent containing sulfur and a metal and an extreme pressure agent containing phosphorus and a metal, zinc dialkylthiocarbamate (Zn-DTC), molybdenum dialkylthiocarbamate (Mo-DTC), lead dialkylthiocarbamate, dialkylthio Examples thereof include tin carbamate, zinc dialkyl dithiophosphate (Zn-DTP), molybdenum dialkyl dithiophosphate (Mo-DTP), sodium sulfonate, calcium sulfonate and the like. Typical of extreme pressure agents containing phosphorus in the molecule are phosphoric esters such as tricresyl phosphate and amine salts thereof. The blending amount of these extreme pressure agents is preferably 0.01% by mass or more and 30% by mass or less, and more preferably 0.01% by mass or more and 10% by mass or less based on the present transmission oil from the viewpoint of compounding effect and economy It is.

Detergent dispersants include metal sulfonates, metal salicylates, metal finates, and succinimides. The amount of the cleaning / dispersing agent is preferably 0.01% by mass to 30% by mass, more preferably 0.05% by mass to 10% by mass in terms of the total amount of the metal, in terms of metal amount, from the viewpoint of compounding effect. It is below.
Examples of the rust inhibitor include metal sulfonates, succinates, alkylamines and alkanolamines such as monoisopropanolamine. The blending amount of these rustproofing agents is preferably 0.01% by mass to 10% by mass, more preferably 0.05% by mass to 5% by mass, based on the present transmission oil, from the viewpoint of the blending effect.

Examples of the metal deactivator include benzotriazole, thiadiazole and the like. The preferable blending amount of these metal deactivators is preferably 0.01% by mass or more and 10% by mass or less, and more preferably 0.01% by mass or more and 1% by mass or less based on the present transmission oil from the viewpoint of compounding effect It is.
As an antifoamer, methyl silicone oil, fluoro silicone oil, polyacrylate etc. can be mentioned. The blending amount of these antifoaming agents is preferably 0.0005% by mass or more and 0.01% by mass or less on the basis of the present transmission oil from the viewpoint of the blending effect.

EXAMPLES The present invention will next be described in more detail by way of Examples and Comparative Examples, which should not be construed as limiting the invention in any way.
[Examples 1 to 6, Comparative Examples 1 to 4]
Each sample oil was prepared at the mixing ratio shown in Table 1 assuming transmission oil. The kinematic viscosity of each sample oil at 100 ° C. is in the range of 5.5 to 5.6 mm ² / s, as shown in Table 1.

1) Base oil: mixed base oil consisting of 60N mineral oil and 150N mineral oil (100 ° C. kinematic viscosity: 3.0 mm ² / s)
2) Dispersant A1: polyisobutenyl succinic acid monoimide (mass average molecular weight of polyisobutenyl group: 1300, nitrogen content: 1.7% by mass)
3) Dispersant A2: polyisobutenyl succinic acid monoimide (mass average molecular weight of polyisobutenyl group: 950, nitrogen content: 2.1 mass%)
4) Friction modifier B: oleylamine (nitrogen content: 4.7% by mass)
5) Friction modifier C: diethanol tallow amine (nitrogen content: 4% by mass)
6) Friction modifier D: isostearic acid amide (nitrogen content: 6.2% by mass)
7) Friction modifier E: dimethyloctadecylamine 8) other additives (additive package): PMA viscosity index improver, amine antioxidant, phenolic antioxidant, phosphorus extreme pressure agent, sulfur electrode Pressure agents, sulfur-based copper deactivators, and antifoam agents

〔Evaluation method〕
The capacity of the shift clutch and the judder life of the lockup clutch were measured for each sample oil by the following method, and the results are shown in Table 1.
(Capacity of shift clutch)
The test was conducted in accordance with M348-2002, and μs (coefficient of static friction) at 100 ° C. was determined to determine the clutch capacity.
(Judder life of lockup clutch)
The test conditions were in accordance with JASO M 349-98, and performance tests were conducted during the continuous slip endurance test. Specifically, a μ-V curve was obtained at 120 ° C., and the time (hr) in which dμ / dV became negative was taken as the judder life.

〔Evaluation results〕
From the results of Table 1, it is found that the sample oils of Examples 1 to 6 in which the (A) component, the (B) component, the (C) component and the (D) component are blended have a high clutch capacity and a long judder life. It turns out that it is making it compatible. On the other hand, the sample oils of Comparative Examples 1 to 4 lacking any of the (A) component, the (B) component, the (C) component and the (D) component can not achieve both high clutch capacity and long judder life . Incidentally, Comparative Example 1 and Comparative Example 2 use the component (A1) and the component (A2) alone, respectively, and the component (A) is not blended. Therefore, in the sample oil of Comparative Example 1, although the judder life is long, the clutch capacity is not sufficient. In the sample oil of Comparative Example 2, the clutch capacity is sufficient but the judder life is short.
The present invention includes the following aspects.
[1]
In base oil,
(A) Two or more kinds of succinimides having an alkenyl group or an alkyl group, and having a different mass average molecular weight of the alkenyl group or the alkyl group,
(B) Primary amines having a carbon chain having 12 to 24 carbon atoms,
(C) Aliphatic amine alkylene oxide adducts having a carbon chain having 12 to 20 carbon atoms,
And (D) an amide compound
Automatic transmission oil characterized by
[2]
In the automatic transmission fluid according to the above [1],
The succinimide in the component (A) is a succinate monoimide
Automatic transmission oil characterized by
[3]
In the automatic transmission oil according to the above [1] or [2],
The mass average molecular weight of the alkenyl group or the alkyl group is 800 or more and 1,500 or less
Automatic transmission oil characterized by
[4]
In the automatic transmission fluid according to the above [3],
The component (A) is a succinimide (A1) having an alkenyl group or an alkyl group having a mass average molecular weight of 1200 to 1,500, and a succinimide having an alkenyl group or an alkyl group having a mass average molecular weight of 800 to less than 1200 (A2) is included
Automatic transmission oil characterized by
[5]
In the automatic transmission fluid described in [4] above,
The blending ratio of the component (A1) is 50% by mass or more and 80% by mass or less based on the total amount of the component (A1) and the component (A2).
Automatic transmission oil characterized by
[6]
In the automatic transmission oil according to any one of the above [1] to [5],
The blending amount of the component (A) is 4.5% by mass or more and 6% by mass or less based on the automatic transmission fluid
Automatic transmission oil characterized by
[7]
In the automatic transmission oil according to any one of the above [1] to the above [6],
The blending amount of the component (B) is 24 mass ppm or more and 235 mass ppm or less based on the automatic transmission fluid and nitrogen conversion amount.
Automatic transmission oil characterized by
[8]
The automatic transmission oil according to any one of the above [1] to [7],
The blending amount of the component (C) is 10 mass ppm or more and 320 mass ppm or less in terms of nitrogen based on the basis of the automatic transmission fluid.
Automatic transmission oil characterized by
[9]
In the automatic transmission oil according to any one of [1] to [8],
The blending amount of the component (D) is 62 mass ppm or more and 310 mass ppm or less in terms of nitrogen based on the basis of the automatic transmission fluid.
Automatic transmission oil characterized by

Claims (12)

In base oil,
(A) Two or more kinds of succinimides having an alkenyl group or an alkyl group, and having a different mass average molecular weight of the alkenyl group or the alkyl group,
(B) at least one primary amine selected from alkylamines and alkenylamines having a carbon chain having 12 to 24 carbon atoms,
(C) Aliphatic amine alkylene oxide adducts having a carbon chain having 12 to 20 carbon atoms,
And (D) an automatic transmission oil formed by blending an aliphatic carboxylic acid amide having a carbon chain having a carbon number of 12 or more and 20 or less ,
Component (A) is a non-modified succinimide (A1) having an alkenyl group or an alkyl group having a mass average molecular weight of 1200 to 1,500, and a non-modified succinimide having an alkenyl group or an alkyl group having a mass average molecular weight of 800 to less than 1200 An automatic transmission oil comprising a modified succinimide (A2) and the like. The automatic transmission fluid according to claim 1, wherein
An automatic transmission oil, wherein the succinimide in the component (A) is a succinate monoimide. The automatic transmission oil according to claim 1 or 2,
An automatic transmission oil characterized in that a blending ratio of the component (A1) is 50% by mass or more and 80% by mass or less based on a total amount of the component (A1) and the component (A2). The automatic transmission oil according to any one of claims 1 to 3
An automatic transmission fluid characterized in that a blending amount of the component (A) is 4.5% by mass or more and 6% by mass or less on the basis of the automatic transmission fluid. The automatic transmission oil according to any one of claims 1 to 4,
An automatic transmission oil characterized in that a blending amount of the component (B) is 24 mass ppm or more and 235 mass ppm or less in terms of nitrogen based on the said automatic transmission oil. The automatic transmission oil according to any one of claims 1 to 5,
An automatic transmission oil characterized in that a blending amount of the component (C) is 10 mass ppm or more and 320 mass ppm or less in terms of nitrogen based on the automatic transmission oil. The automatic transmission oil according to any one of claims 1 to 6,
An automatic transmission oil characterized in that a blending amount of the component (D) is 62 mass ppm or more and 310 mass ppm or less in terms of nitrogen based on the automatic transmission oil. The automatic transmission oil according to any one of claims 1 to 7,
An automatic transmission fluid characterized in that the base oil has a kinematic viscosity at 100 ° C. of 1.5 mm ² / s or more and 4 mm ² / s or less. The automatic transmission oil according to any one of claims 1 to 8,
The mass average molecular weight of the alkenyl group or alkyl group in the component (A1) is 1300 or more and 1400 or less, and the mass average molecular weight of the alkenyl group or alkyl group in the component (A2) is 900 or more and 1100 or less. Automatic transmission oil. The automatic transmission oil according to any one of claims 1 to 9 ,
An automatic transmission oil characterized in that the component (D) comprises one or more selected from stearic acid amide, isostearic acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, and oleic acid amide. The automatic transmission oil according to any one of claims 1 to 10 ,
An automatic transmission oil characterized by further comprising (E) a tertiary amine. The automatic transmission fluid according to claim 11 , wherein
An automatic transmission oil characterized in that a blending amount of the component (E) is 10 mass ppm or more and 100 mass ppm or less in terms of nitrogen based on the automatic transmission oil.