JP2003221589A - Heavy duty diesel engine lubricating oil composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating oil composition effective for improving the fuel economy of a heavy duty diesel engine. <P>SOLUTION: The economical efficiency of a heavy duty diesel engine is improved by using an effective amount of one or more compounds capable of reducing friction coefficients under mixed lubrication or boundary lubrication conditions in a heavy duty diesel engine lubricating oil composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to one or more compounds capable of reducing the coefficient of friction under mixed lubrication or boundary lubrication conditions in heavy duty diesel engine lubricating oil compositions. Regarding the use of.
The present invention also relates to such lubricating oil compositions, which have been found to improve fuel economy during operation of heavy duty diesel engines.

[0002]

BACKGROUND OF THE INVENTION In the heavy duty truck market, diesel engines are used as the preferred power source because of their excellent life and special lubricants that meet the more stringent performance requirements of such heavy duty diesel engines. Is being developed. Also, several engine tests are required to evaluate satisfactory heavy-duty performance, for example the Cummins M11 which evaluates soot-related valve train wear, filter clogging and sludge.
Exams are included. Fuel consumption of heavy-duty diesel engines is significant to the fleet operator because the fuel cost is 30% of the freight cost.
Because it occupies Therefore, the use of a fuel efficient lubricating oil composition would help reduce fuel consumption, even a reduction of 1% would be a significant cost savings. RI Taylor says “Heavy Duty Diesel Engine Fue
l Economy: Lubricant Sensitivities ”00FL-309, SAE
2000 Millennium Publication “Advances in Powertr
In ain Tribology ”, SAE 2000, heavy-duty diesel engines are more drivable under hydrodynamic conditions than passenger car engines, so friction modifiers are not effective in reducing engine friction loss in heavy-duty diesel engines This conclusion was made by Stauffer et al. On the Lubrication Engine.
ering (December 1984), pp. 744-751; and Kagay.
supported by SAE 811412.

[0003]

DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION AND MEANS FOR SOLVING THE PROBLEMS In contrast, friction modifiers have been found to be effective in improving the fuel economy performance of heavy duty diesel engines. Accordingly, in a first aspect, the present invention reduces the coefficient of friction under mixed lubrication or boundary lubrication conditions in a heavy duty diesel engine lubricating oil composition to improve the fuel economy of a heavy duty diesel engine. Use of an effective amount of one or more compounds is possible. In a second aspect, according to the present invention, a heavy duty diesel engine lubricating oil composition comprising a large amount of oil having a lubricating viscosity and the following (A) to (C): (A) mixture added thereto. A detergent composition comprising an effective amount of one or more compounds capable of reducing the coefficient of friction under lubrication or boundary lubrication conditions; (B) a small amount of a metal salt of an aromatic carboxylic acid. And (C) a composition containing a small amount of a dispersant additive and having a nitrogen content (preferably derived from the dispersant additive) based on the weight of the composition of at least 0.06% by weight; Provided.

In a third aspect, in accordance with the present invention, a heavy duty diesel engine additive concentrate composition comprising a diluent and the following (A)-(C): (A) mixed lubrication or boundary lubrication conditions. One or more compounds capable of reducing the friction coefficient by means of: (B) a detergent composition containing a metal salt of an aromatic carboxylic acid; and (C) an additive containing a dispersant additive. The heavy duty diesel engine lubricating oil composition according to the second aspect, wherein the heavy duty diesel engine lubricating oil composition contains one kind or two or more kinds, and the ratio of each is 2 to 20% by mass. There is provided the composition as it is provided. In a fourth aspect, the present invention provides a combination of a heavy duty diesel engine in a land-based vehicle and the lubricating oil composition according to the second aspect, wherein the total displacement of the engine is
(total displacement) is at least 6.5 liters, and the displacement per cylinder is at least 1.0.
The combination is provided in liters. In a fifth aspect, according to the present invention, a method of lubricating a heavy duty diesel engine in land transport means, wherein the total displacement of the engine is at least 6.5 liters and the displacement per cylinder is Is at least 1.0 liter, and the method is provided comprising supplying to the engine the lubricating oil composition according to the second aspect.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION American Petroleum Institute (API), European Association of Automobile Manufacturers (Association des Constructeur Europeen d '
Autombile) (ACEA) and Japanese Organizational Standard (Japanese Standard)
s Organization (JASO) has specified the level of performance required for lubricating oil compositions. There are also globally known performance standards, including ACEA, API and J
Includes ASO standard testing and performance levels. Accordingly, the heavy duty lubricating oil composition of the present invention preferably has at least the performance requirements of a heavy duty diesel engine lubricant, such as at least API CF-4 or API C.
G-4; preferably satisfying at least API CH-4; especially at least API Cl-4. In another embodiment, the lubricating oil composition of the present invention, independently of meeting API performance requirements, preferably at least ACEA E.
2-96; more preferably at least ACEA E3-96; especially at least ACEA E4-99; advantageously at least ACEA E5-99. In a further embodiment, the lubricating oil composition of the present invention is preferably JASO DH-1 or Global independent of meeting API and ACEA performance requirements.
It satisfies DHD-1. Features of the invention are described in more detail below.

Heavy Duty Diesel Engine The heavy duty diesel engine of the present invention is used in land transportation means, preferably large road vehicles, such as large trucks. Road vehicles typically weigh more than 12 tons. Engines used in such vehicles tend to have a total displacement of at least 6.5 liters, preferably at least 8 liters, more preferably at least 10 liters, for example at least 15 liters; A 20 liter engine is preferred. In general, an engine with a total displacement of more than 24 liters is not considered to be a land vehicle. The engine according to the invention also has a displacement per cylinder of at least 1.0 liter or at least 1.5 liter, for example at least 1.75 liter, preferably at least 2 liter. In general,
Heavy duty diesel engines in road vehicles have a displacement per cylinder of up to 3.5 liters, eg up to 3.0 liters; preferably up to 2.5 liters.
It is a liter. The term "heavy duty" as it relates to internal combustion engines is known in the art (see ASTM D4485 Chapter 3.17): where heavy duty engine operation refers to average speed, power and internal temperature (general Is closer to the potential maximum): Therefore, heavy duty diesel engines are generally considered to be operated under such conditions. The term "total displacement" used in this specification
And "displacement per cylinder" are known to those skilled in the art for internal combustion engines ("Diesel Engine Reference Book", B. Challen and
Edited by R. Baranescu, 2nd edition, 1999, SAE International
See publication). Briefly, the term "displacement" corresponds to the cylinder capacity in the engine as determined by piston movement, and thus "total displacement" is the total capacity depending on the number of cylinders; “Displacement” is
It is the ratio of total displacement to the number of cylinders in the engine.

Lubricating Oil Composition In each aspect of the present invention, the lubricating oil composition preferably has a phosphorus content of 0.
Less than 13% by mass, or less than 0.1% by mass, or 0.09
Less than 0.08% by weight, or less than 0.08% by weight, or less than 0.07% by weight, or less than 0.06% by weight; more preferably at most 0.05% by weight, or at most 0.04% by weight,
Or a maximum of 0.03% by mass; for example, 0.001 to
0.03 mass%; for example, 0.2 mass% at the maximum, or 0.01 mass% at the maximum. In a preferred embodiment of each aspect, the lubricating oil composition has a phosphorus content of zero. In each aspect of the invention, the lubricating oil composition preferably has a sulfur content based on the weight of the composition, independent of the phosphorus content, of up to 1.0% by weight, or up to 0.75% by weight. %, Or at most 0.50% by mass, or at most 0.45% by mass, or at most 0.4% by mass, or at most 0.35% by mass, or at most 0.3% by mass, or at most 0.25% by mass Yes; especially 0.2 mass% or 0.15 mass% at maximum; for example, 0.001 to 0.1 mass%. In a preferred embodiment of each aspect, the lubricating oil composition has a sulfur content of zero.

The amounts of phosphorus and sulfur in the lubricating oil composition are each measured by ASTM D5185. In an embodiment of each aspect of the invention, the amounts of phosphorus and sulfur are derived from antiwear additives such as zinc dithiophosphate. The lubricating oil composition of the present invention comprises SAE 20W-X,
SAE 15W-X, SAE10W-X, SAE 5W
-X or SAE 0W-X viscosity form (visco
metric form), where X is 20, 3
Represents either 0, 40 or 50; the properties of different viscosity grades can be found in the SAE J300 classification. In an embodiment of each aspect of the invention, independently of the other embodiments, the lubricating oil composition comprises SAE 5W-
X or SAE 0W-X, where X is 2
Represents either 0, 30, 40 or 50. Preferably X is 20 or 30. It has also been found that the lubricating oil composition of the present invention meets the wear protection requirements required by heavy duty diesel engines, such as the Cummins M11 requirements for evaluating soot related valve train wear. Accordingly, heavy duty diesel engine lubricating oil compositions of the present invention, particularly low viscosity lubricating oil compositions, such as SAE 5W-X or SAE 0W.
The -X lubricant, where X is as described above, can improve fuel economy and wear protection for heavy duty diesel engines.

Therefore, in a preferred embodiment of each aspect of the present invention, preferably SAE5W-X or SAE
A heavy duty diesel engine lubricating oil composition in the form of a 0W-X oil composition comprises one or more compounds capable of reducing the coefficient of friction under mixed lubrication or boundary lubrication conditions, and , 100 ° C., a base blend viscosity of at least 8.2 mm ² s ⁻¹ , for example 8.5 to 30 mm ² s ⁻¹ , preferably 8.5 to 10 mm ² s ⁻¹ . As used herein, the term "base blend viscosity" refers to Newtonian behaviour, and all components of the present invention (including carrier oils such as basestocks, but viscosity modifiers that are believed not to exhibit Newtonian behaviour. Solid polymer or'active ingredient 'is excluded) of the composition comprising a component or mixture of components corresponding to 100, as measured by ASTM D445.
Means viscosity in ° C. Therefore, the base blend viscosity is based on the base stock oil, dispersant, detergent, ZDD
It can mean the viscosity of a composition comprising P, antioxidants, all carrier and diluent oils of the components, pour point depressants and other components exhibiting Newtonian behaviour, such as defoamers.

Computer model systems can also be used to predict the base blend viscosity of lubricating oil compositions based on the viscosity of the components present therein. Alternatively, the base blend viscosity can be measured by removing the viscosity improver polymer from the lubricating oil composition and then measuring the viscosity of the resulting composition. Alternatively, the base blend viscosity can be determined by measuring the viscosity of the lubricating oil composition at high shear rates, which shear rate corresponds to a rate that does not affect the viscosity of the oil composition, and is generally , Its speed is 10 ⁷ s
^-1 higher. A lubricating oil composition having a given base blend viscosity parameter and one or more given compounds improves fuel economy and at least Cummins.
M11 ACEA for 200 hour crosshead wear test
It has been found to meet E5-99 and / or APICH-4 standard limits. In a preferred embodiment of each aspect of the present invention, the oil composition has an ash content, measured according to ASTM D874, of less than 2% by weight, preferably 1.
Less than 5% by weight, in particular less than 1% by weight;
It is 0.5% by mass.

Oils of Lubricating Viscosity The lubricating oil may be synthetic or mineral oils of lubricating viscosity selected from the group consisting of Group I, II, III, IV and V base stocks and mixtures thereof.
Basestocks can be produced using a variety of processes including but not limited to distillation, solvent refining, hydrotreating, oligomerization, esterification and rerefining. API 1509 "Engine Oil Lice
nsing and Certification System ”, 4th Edition, 1996
In December, 2010, it was stated that all base stocks fall into five general categories:

Group I base stocks have a saturation of 9
Less than 0% and / or a sulfur content greater than 0.03% and a viscosity index equal to or greater than 80 and less than 120; Group II basestocks
A degree of saturation equal to or higher than 90%, a sulfur content equal to or lower than 0.03% and a viscosity index equal to or higher than 80 and lower than 120; Group III base Stock has a saturation of 90
% Or higher, with a sulfur content of 0.03%
Is less than or equal to, and has a viscosity index of 12
Group IV base stocks include polyalphaolefins (PAOs); and Group V base stocks include all other base stocks not included in Group I, II, III, or IV.

Group IV base stock, namely poly alpha
Olefins (PAOs) include hydrogenated oligomers of alpha olefins, the most important methods of oligomerization being free radical treatment, Ziegler catalysis, cation and Friedel-
Crafts catalysis. Preferably, the lubricating oil is selected from any of Group IV basestocks.
Especially preferred are any of Group II, III, IV or V basestocks or mixtures of two or more thereof, or 5-80% by weight of Group I, I.
Mixtures of I, III or V basestocks with Group IV basestocks, for example, fully synthetic mixtures of Group IV and Group V basestocks. The test method used in identifying the above groups is ASTM D2007 for saturation;
Viscosity index is ASTM D2270; sulfur content is ASTM D2622, 4294, 49
27 and 3120.

Compounds Compounds capable of reducing the coefficient of friction under mixed lubrication or boundary lubrication conditions (eg, at high pressure and sliding contact) are known as friction modifiers, and those skilled in the art will appreciate such compounds. Could be confirmed by tests known in the art, such as tests performed on high frequency reciprocating rigs. Examples of contacts where high pressure and slip conditions occur are in valve trains, piston ring liners and journal bearings. The class of friction modifiers is derived from polar compounds that can be adsorbed on metal surfaces, which compounds have polar head groups and lipophilic hydrocarbyl chains. They can be broadly divided into two categories: (A) nitrogen-containing compounds such as amines, imides and amides, and (B) oxygen-containing compounds such as fatty acids and their complete or partial esters.

The nitrogen compound (A) is suitably selected from the group consisting of (i) to (iv): (i) an alkyleneamine, especially a monoalkylenediamine, a dialkylenetriamine and / or a polyalkylenediamine. Alkylenepolyamines, N, N'-dimethylethylenediamine, which in turn may have further alkyl and / or hydroxy substituents; (ii) alkanolamines, in particular alkanolamines, for example ethanolamine,
N-alkyl derivatives of propanolamine, isopropanolamine and butanolamine (in which
The number of N-alkyl groups is 1 to 20, preferably 12 to 18.
C., N, N-dialkanolamines, N-alkyleneaminoalkyl dialkanolamines, and di (polyalkyleneoxy) alkanolamines; (iii) alkylamides, in which N-
Alkyl groups have 1 to 25, preferably 12 to 22 carbon atoms); (iv) alkanolamides, especially mono- and di-alkanolamides of alkylcarboxylic acids and their (polyalkyleneoxy) alkanols. Amide. Specific examples of the nitrogen-containing organic friction modifiers included in the above category are as follows.

(I) Monoethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine, and their N-alkyl derivatives such as Duomeen® T, and N, N'-di (1-
Hydroxyl-1,1-dimethylmethyl) ethylenediamine, namely Kaneda® No. 6; (ii) N-alkyl of ethanolamine, diethanolamine, propanolamine, isopropanolamine, butanolamine or a suitable N, N-dialkyl derivative, N-alkyleneaminoalkylethanolamine (wherein the alkyl group is from 10 to 10). Having 20 carbon atoms), a di (polyalkyleneoxy) alkanolamine (in which the total number of alkyleneoxy groups is 2-20, preferably 5-15), especially N-methylethanolamine (Kaneda (registered trademark)
No. 1), N-hydrocarbyldiethanolamine (Kaneda (registered trademark) No. 2B), N, N-dibutylethanolamine (Kaneda (registered trademark) No. 4), N
-Dodecyldiethanolamine (Eethomeen (registered trademark) C12), N-hydrocarbyldiethanolamine (Ethomeen (registered trademark) S12), N-trimethyleneaminoalkyldiethanolamine (in which the alkyl group has 12 to 18 carbon atoms) (Ethodu
omeen®), N-alkyl-di (polyalkyleneoxy) diethanolamine (5, 10 respectively)
And 15 polyethyleneoxy groups) (Tamno®-5, -10 and -15 respectively), and N, N′-dihydroxyethylethylenediamine (Kane
da (registered trademark) No. 5);

(Iii) alkylamines, in which the alkyl groups have 1 to 30, preferably 5 to 20 carbon atoms and may be straight-chain or branched. For example, Armoslip (registered trademark) CP-P and Armoslip
(Registered trademark) E (in which the alkyl group has 17 and 21 carbon atoms, respectively); (iv) ethanolamide, diethanolamide and its (polyalkyleneoxy) ethanolamide, and their N- Alkyl derivatives, in which the N-alkyl group has 1 to 25, preferably 5 to 20 carbon atoms, and in the case of (polyalkyleneoxy) ethanolamide the amide is 5 to Having 20 polyoxyalkylene groups), such as N-acyl ethanolamine, such as Kaneda® No. 9
(In which the alkyl group in the acyl component has 12 carbon atoms), diethanolamine, such as Amizole® ISDE (in which the alkyl group in the acyl component has 18 carbon atoms). No.), Kaneda (registered trademark) No. 10
(In which the alkyl group in the acyl component has 12 carbon atoms), di (polyethyleneoxy) ethanolamide (in which the acyl group in the acyl component has 17 carbon atoms) , And the total number of polyethyleneoxy groups in the molecule is 5) (eg Tamdo®-5).

Particularly preferred examples are compounds of oleic acid and tetraethylenepentamine, ethoxylated tallow amine and ethoxylated tallow ether amine. Also, organometallic compounds of hydrocarbyl amine compounds, for example,
Those disclosed in GB-A-882,295 are useful. The amines can be used on their own or in the form of reaction products or adducts with boron compounds such as boron oxides, boron halides, metaborates, boric acids or mono-, di- or tri-alkyl borates. it can. Examples of oxygen-containing organic friction modifiers (B) are carboxylic acids having 1 to 25 carbon atoms, such as stearic acid and oleic acid,
Preferably having from 12 to 17 carbon atoms; full or partial esters thereof with di- and / or polyhydric alcohols, such as glycerol, trimethylolpropane,
Pentaerythritol and polyhydroxypyran; and metal salts thereof, such as metal stearates and oleates, in which the metal is a transition metal (eg, zinc), a Group 1 metal and a Group 2 metal ( For example, it is selected from calcium)). Specific examples of oxygen-containing organic friction modifiers (B) include glycerol and alkylcarboxylic acids such as mono-, di- and tri-esters of oleic acid; corresponding pentaerythritol esters such as
Oleic acid esters, especially mono-oleic acid esters; and monoesters of 1-methylenehydroxy-2,3,4-trihydroxypyran, in which the methylenehydroxy group is esterified with acetic acid. is there. Esters of carboxylic acids and anhydrides with alkanols are described in US-A-4,702,850.

Examples of other conventional friction modifiers are M. Belzer.
"Journal of Tribology" (1992), Vol. 114, pp. 6
75-682 and M. Belzer and S Jahanmir “Lubrication S
cience ”(1988), Vol. pp. 3-26. Molybdenum disulfide-depositing oil-soluble additives are also effective friction modifiers, eg oil-soluble or oil-dispersible. Examples of the organic molybdenum compound include molybdenum xanthate, thioxanthate, and
Alkoxides, carboxylates (eg derivatives of polyhydric fatty acid esters such as MOLYVAN® 85
5), dialkyldithiocarbamates, dialkyldithiophosphinates and dialkyldithiophosphates. The molybdenum compound may be, for example, mononuclear, binuclear, trinuclear or tetranuclear. Dinuclear molybdenum compounds of the formula _{Mo 2 O X S 4-X} L 2 ( wherein, L is a ligand, for example, dialkyl dithiocarbamates and dialkyl dithiophosphates, X is an integer of 0-4) represented by be able to. An example of a binuclear (or dimeric) molybdenum dialkyldithiocarbamate is represented by the formula:

[0020]

[Chemical 1] (Wherein R _{1 to} R ₄ independently represent a linear, branched or aromatic hydrocarbyl group having 1 to 24 carbon atoms; and X _{1 to} X ₄ are independently Represents an oxygen atom or a sulfur atom). The four hydrocarbyl groups, R _{1 to} R _4, are
They may be the same or different from each other.

Another group of organomolybdenum compounds useful in the lubricating compositions of the present invention are trinuclear (or trimer) molybdenum compounds, especially compounds of the formula Mo ₃ S _k L _n Q _z and mixtures thereof. Where L is an independently selected ligand having an organic group having a sufficient number of carbon atoms to dissolve the compound in oil, and n is 1 to 4
Where k varies from 4 to 7, Q is selected from the group consisting of neutral electron donating compounds, such as water, amines, alcohols, phosphines, ethers, z is 0 to 5, nonstoichiometry Contains the value. A total of at least 21, for example at least 25, at least 30 or at least 35 carbon atoms should be present in all of the ligand organic groups. The ligands are:

[0022]

[Chemical 2] And a mixture thereof, wherein X, X ₁ , X ₂ and Y are selected from the group consisting of oxygen and sulfur, and in the formula R ₁ , R ₂ and R are , Selected from the group consisting of hydrogen and organic groups which may be the same or different. Preferably, the organic group is a hydrocarbyl group, such as alkyl (eg, in which the carbon atom attached to the rest of the ligand is primary or secondary).
Aryl, substituted aryl and ether groups. More preferably, each ligand has the same hydrocarbyl group.

The term "hydrocarbyl" as used herein refers to a substituent having a carbon atom directly attached to the remainder of the ligand and is of predominantly hydrocarbon character. Such substituents include the following: Hydrocarbon substituents, ie aliphatic (eg alkyl or alkenyl), alicyclic (eg cycloalkyl or cycloalkenyl) substituents, aromatic-, aliphatic- and alicyclic-substituted aromatic nuclei, and cyclic substituents , Where the ring is
It is completed via the other part of the ligand (ie the two substituents together form an alicycle). 2. Substituted hydrocarbon substituents, ie, those containing non-hydrocarbon radicals that do not alter the predominant hydrocarbyl properties of the substituent. Those skilled in the art will be aware of suitable groups such as halo, especially chloro and fluoro, amino, alkoxyl, mercapto, alkylmercapto, nitro, nitroso, sulfoxy and the like. Importantly, the ligand's organic groups have a sufficient number of carbon atoms to render the compound soluble in oil. For example, the number of carbon atoms in each group will generally be 1-100, preferably 1-30, and more preferably 4-20. Preferred ligands include dialkyldithiophosphates, alkylxanthates, carboxylates, dialkyldithiocarbamates (“dtc”) and mixtures thereof. Most preferred is a dialkyldithiocarbamate. Those skilled in the art will appreciate that formation of the compounds of the present invention (as shown below)
It will be appreciated that there is a need to select a ligand with a suitable charge to balance the charge of the core.

The compound having the formula Mo ₃ S _k L _n Q _z has a cationic core surrounded by an anionic ligand,
Among them, the cationic core is, for example,

[Chemical 3] Represented by a structure such as that has a net charge of +4
It Trinuclear molybdenum Mo ₃S_kSpecies (K is 4-7)
The electrical neutrality of
And a cationic compound. Four
Two monoanionic ligands, eg dithiocarbame
Is preferred. Not bound by theory, but two
Are three or more trinuclear cores with one or more ligands
May be coupled or interconnected,
The ligand may be polydentate, ie 1 or
Considered to have multiple connections to more than one core
To be Oxygen and / or selenium replaces sulfur in the core
It is considered that they may be replaced.

The oil-soluble trinuclear molybdenum compound is a molybdenum source such as (NH ₄ ) _{2 in} a suitable liquid / solvent.
Mo ₃ S ₁₃ · n (H ₂ O) (where n varies from 0 to 2,
(Including non-stoichiometric values) can be prepared by reacting with a suitable source of ligand such as tetraalkyl thiuram disulfide. Other oil-soluble trinuclear molybdenum compounds are molybdenum sources such as (NH ₄ ) ₂ Mo ₃ S _{1 3} · n (H ₂ O), ligand sources such as tetraalkylthiuram disulfide, dialkyldithiocarbamates in a suitable solvent. Alternatively, it may be formed during the reaction of a dialkyldithiophosphate and a sulfur-abstracting agent such as cyanide, sulfite or a substituted phosphine. Alternatively, trinuclear molybdenum sulfur halide salts such as [M '] ₂ [Mo ₃ S ₇ A ₆ ].
Wherein M'is a counterion and A is a halogen, such as Cl, Br or I, is reacted with a ligand source, such as a dialkyldithiocarbamate or dialkyldithiophosphate in a suitable liquid / solvent, An oil soluble trinuclear molybdenum compound may be formed. Suitable liquids / solvents may be, for example, aqueous or organic. The selected ligand must have a sufficient number of carbon atoms to solubilize the compound in the lubricating composition.

Trinuclear molybdenum compounds for use in the compositions of the present invention have the formula Mo ₃ S ₇ ((alkyl) ₂ d
tc) ₄ having an alkyl of about 8-18
Of carbon atoms) and alkyl is
Preferably, "here (coco)" is an alkyl chain, it is typically C _8-18 alkyl, vary even number of carbon atoms chain of mainly the C _10, C ₁₂ and C ₁₄ alkyl derived from coconut oil Is a mixture of. As another example of the molybdenum compound, (i) an acidic molybdenum compound is selected from the group consisting of succinimide, carboxylic acid amide, hydrocarbyl monoamine, phosphoramide, thiophosphoramide, Mannich base, dispersant viscosity index improver or a mixture thereof. Reacting with a selected basic nitrogen compound in the presence of a polar promoter to form a molybdenum complex, and (ii) reacting the molybdenum complex with a sulfur-containing compound, thereby sulfur- and molybdenum A molybdenum sulfide-containing compound produced by forming a containing compound. In one embodiment of the present invention, the molybdenum compound is preferably binuclear or trinuclear, more preferably trinuclear. In another embodiment of the present invention, the molybdenum compound has a nuclear nature.
)), it is fully sulphided, ie its core contains only sulfur as a non-metallic element, eg M
o ₂ S ₄ , Mo ₃ S ₄ and Mo ₃ S ₇ .

In another embodiment of the invention, the molybdenum compound is preferably a dithiocarbamate compound, for example a dinuclear or trinuclear molybdenum dithiocarbamate compound; a particularly effective compound is of the formula Mo ₃ S ₇ (( A molybdenum dialkyldithiocarbamate compound represented by alkyl) ₂ dtc) ₄ . Colloidal friction modifiers such as graphite, borate and molybdenum disulfide (present in the oil composition by dispersion),
It may be used in the present invention. The oil composition may include a friction modifier, such as a mixture of polar compounds (which may be organic or organometallic) capable of being adsorbed on the metal surface, and a molybdenum compound. In an embodiment, the friction modifier is an organic polar compound having a lipophilic hydrocarbyl chain, such as glycerol monooleate. In another embodiment, the friction modifier is a molybdenum compound. The friction modifier is present in an amount sufficient to improve the fuel economy of the lubricated engine.
The amount is typically 0.01 to 5.0% by weight, preferably 0.05 to 5.0% by weight, based on the weight of the oil composition.
1.5% by mass, more preferably 0.1 or 0.15
It is 0.5% by mass. In the case where the friction modifier is a molybdenum compound, the lubricating oil composition is preferably 5 to 5000 mass pp, based on the mass of the lubricating oil composition.
m, more preferably 10 to 1000 mass ppm, especially 50 to 750 mass ppm, for example 75 to 500 mass pp.
m of molybdenum may be included. The amount of molybdenum is measured by ASTTM D5185.

Detergent Compositions Detergents may also be present in the lubricating oil composition of the present invention. Detergents are additives that reduce the formation of piston deposits, such as hot varnish and lacquer deposits in engines; they have acid-neutralizing properties and are capable of keeping finely divided solids in suspension. It is possible. It is based on the metal "soap", a metal salt of an organic acid, known as a surfactant. The detergent comprises a polar head, i.e. a metal salt of an organic acid, with a long hydrophobic tail for oil solubility. Thus, the organic acid is typically one or more functional groups, such as OH or COOH or SO ₃ H; having and hydrocarbyl substituent. Examples of organic acids include sulfonic acids, phenols and their sulfurized derivatives, and carboxylic acids. Thus, for example, a detergent composition may be present that includes one or more organic acid metal salts, such as a mixture of sulfonic acid metal salts and carboxylic acid metal salts. It has been found that detergent compositions containing a metal salt of an aromatic carboxylic acid improve performance.

A preferred detergent composition comprises greater than 50 mole% of a metal salt of an aromatic carboxylic acid, based on the moles of metal salt of an organic acid in the detergent composition. Preferably, the proportion of aromatic carboxylic acid metal salt is at least 6 based on the moles of organic acid metal salt in the detergent composition.
0 mol% or at least 70 mol%; more preferably at least 80 mol% or at least 90 mol%.
In the most preferred embodiment, the detergent composition comprises 100 mole% of a metal salt of an aromatic carboxylic acid, based on the moles of organic acid metal salt in the detergent composition, i.e., the detergent composition comprises: It contains only aromatic carboxylic acids as organic acids. The aromatic component of the aromatic carboxylic acid may contain heteroatoms such as nitrogen and oxygen. Preferably, the component contains only carbon atoms; more preferably the component contains 6 or 7 or more carbon atoms;
Benzene is the preferred component. Aromatic carboxylic acid
It may contain one or more aromatic components, for example one or more benzene rings (condensation or bonding via alkylene bonds). The carboxylic acid component may be directly or indirectly bound to the aromatic component. Preferably, the carboxylic acid group is directly attached to a carbon atom in the aromatic moiety, such as a carbon atom in the benzene ring.

More preferably, the aromatic moiety also contains a second functional group, such as a hydroxyl group or a sulfonate group, which may be attached directly or indirectly to a carbon atom in the aromatic moiety. Preferred examples of aromatic carboxylic acids are salicylic acid and their sulfurized derivatives, such as hydrocarbyl-substituted salicylic acids and their derivatives. For example, methods of sulfiding hydrocarbyl-substituted salicylic acids are similar to those used for phenols and are well known to those skilled in the art. Salicylic acid is typically prepared by carboxylation of phenoxide, for example by the Kolbe-Schmidt process, in which case it is usually obtained in a mixture with a non-carboxylated phenol, in a diluent. Let's do it. Preferred substituents in oil-soluble salicylic acid are alkyl substituents. In alkyl-substituted salicylic acids, the alkyl groups are advantageously 5-100, preferably 9-30, especially 14
Contains -20 carbon atoms. When more than one alkyl group is present, the average number of carbon atoms in all alkyl groups is preferably at least 9 to ensure proper oil solubility. The detergent composition may include organic acids other than aromatic carboxylic acids, such as sulfonic acids, phenols and their sulfurized derivatives, and metal salts of carboxylic acids. Such organic acids are described in WO97 / 46643, which is hereby included.

Each of the metal detergents in the detergent composition may be neutralized or overbased,
These terms are understood by those of ordinary skill in the art. The detergent of the present invention may be a salt of one type of organic acid, or a salt of two or more types of organic acid, such as a hybrid complex detergent. Preferably, they are salts of one type of organic acid. Hybrid composite detergents have the basic material within the detergent stabilized by more than one type of organic acid. It will be appreciated by those skilled in the art that a single type of organic acid can include a mixture of the same type of organic acid. For example, the sulfonic acid can include a mixture of sulfonic acids having various molecular weights. Such organic acid compositions are considered as one type. Therefore, the complex detergent
A distinction is made from a mixture of two or more separate overbased detergents, for example a mixture of overbased calcium salicylate detergent and overbased calcium carbonate salt detergent.

The prior art describes examples of overbased complex detergents. For example, International Patent Application Publication Serial Nos. 97-46643 / 4/5/6 and 7 disclose that a mixture of more than one acidic organic compound and a basic metal compound is neutralized and then the mixture is overbased. Hybrid composites produced by oxidization are described. The individual basic micelles of the detergent are therefore stabilized by several types of organic acids. Examples of hybrid complex detergents include calcium phenate-salicylate-sulfonate detergents, calcium phenate-sulfonate detergents and calcium phenate-salicylate detergents. EP-A-0 750 659 describes calcium salicylate phenate complexes prepared by carboxylating calcium phenate and then sulfiding and overbasing a mixture of calcium salicylate and calcium phenate. Such a complex is called "phenalate.
(Phenalate). Preferred complex detergents are salicylate-based detergents such as calcium phenate-salicylate-sulfonate detergents and "phenalates".

When more than one type of organic acid is present in a single detergent, the ratio of any one type of organic acid to the other is not critical.
However, the detergent composition contains a metal salt of an aromatic carboxylic acid in a predetermined ratio. For the avoidance of doubt, the detergent composition should be
It may also contain an ashless dispersant, ie a non-metal containing detergent. Preferably, the detergent composition is at least 1
Includes one overbased metal detergent. Preferred overbased metal detergents include one or more metal aromatic carboxylic acid salts, preferably one or more metal salicylates. First
Group I and Group II metals are preferred as metals in the detergent: more preferably calcium and magnesium, especially calcium. It has been found that a detergent composition comprising at least one calcium salicylate-based detergent, preferably at least one overbased calcium salicylate-based detergent, is particularly effective in the present invention. . Calcium salicylate-based detergent (whether neutral or overbased)
It is believed that a detergent composition containing only one would be advantageous.

Preferably, the detergent composition is such that the amount in the oil composition is based on the surfactant content in the oil composition in millimoles per mmol of surfactant (mmol / mmol / mol).
kg), at least 5 mmol / kg, preferably at least 10 mmol / kg, eg at least 20 m
mol / kg or at least 30 mmol / kg, more preferably at least 50 mmol / kg, most preferably up to 75 mmol / kg. In one embodiment, the amount of detergent composition in the oil composition, based on the content of surfactant, is 10-15 mmol / k.
It is g. Means for measuring the amount of metal salt of aromatic carboxylic acid and the amount of surfactant are known to those skilled in the art. For example, one of ordinary skill in the art would appreciate from information regarding the amount of feedstock (eg, organic acid) used to produce the detergent, and from information regarding the amount of detergent used in the final oil composition. The amount in can be calculated. Analytical methods such as potentiometric titration and chromatography can be used to determine the amount of surfactant and metal salt of aromatic carboxylic acid. By the method of determining the amount of the metal salt of an organic acid (also known as a surfactant), including the amount of the metal salt of an aromatic carboxylic acid, is the best approximation, and by different methods, always, Those of ordinary skill in the art will understand that the exact same results are not obtained; however, they are sufficiently accurate to enable the invention to be practiced.

Dispersant Additive The dispersant additive suspends the oil-insoluble material resulting from oxidation during use in the fluid and thus prevents sludge flocculation and settling or deposition on the metal part. So-called ashless dispersants are organic materials, which, in contrast to metal-containing (ash-forming) detergents, produce substantially no ash on combustion. The borated metal-free dispersant is
It is also recognized herein as an ashless dispersant. Suitable dispersants include, for example, derivatives of long-chain hydrocarbyl-substituted carboxylic acids, in which the hydrocarbyl group contains less than 15,000, such as 5
Having a number average molecular weight of less than 000; examples of derivatives thereof are:
It is a derivative of the high molecular weight hydrocarbyl-substituted succinic acid. Such hydrocarbyl-substituted carboxylic acids can be reacted, for example, with nitrogen-containing compounds, advantageously polyoxyalkylene polyamines, or alcohols. A particularly preferred dispersant is the reaction product of a polyalkylene amine and an alkenyl succinic anhydride. Examples of specifications disclosing dispersants of the last-mentioned type are US-A-3,202,678, US-A-
3,154,560, US-A-3,172,892, US-A-3,024,195, US-A-3,
024,237, US-A-3,219,666, US-A-3,216,936 and BE-A-66
It is 2,875. Alternatively, dispersibility can be obtained with polymeric compounds that improve viscosity index and can provide dispersibility, such compounds being known as multifunctional viscosity index improvers. Such polymers may have, for example, dispersibility and / or
Or, it is different from the conventional viscosity index improver in that it retains performance characteristics such as antioxidant property.

Dispersant olefin copolymers and dispersant polymethacrylates are examples of multifunctional viscosity index improvers. The multifunctional viscosity index improver includes various functional components such as amines, alcohols and amides with a polymer (preferably a number average molecular weight of at least 15,000, for example 20 as measured by gel permeation chromatography or light scattering methods). 000-600,000)
It is manufactured by chemically bonding to. The polymers used may be those described above in connection with the viscosity improver. Therefore, by introducing an amine molecule, dispersion and / or
Alternatively, antioxidant properties may be imparted, but phenolic molecules may be introduced to improve the antioxidant properties. Examples include, therefore, post-grafting with an active monomer, such as maleic anhydride, and then, for example,
It is an ethylene-propylene copolymer derived from an alcohol or an amine. EP-A-24146 and EP-A-0 854
904 describes examples of dispersants and dispersant viscosity index improvers, which are intended to be included herein. Heavy duty diesel engine lubricating oil compositions tend to require greater amounts of dispersant than, for example, passenger car engine oil compositions because more oil insoluble materials, such as soot, are found in heavy duty diesel engines. Because it is formed. Accordingly, the amount of dispersant additive (which may be in the form of a dispersant additive and / or a multifunctional viscosity index improver additive) in a heavy duty diesel engine lubricating oil composition is based on nitrogen. , Based on the weight of the oil composition, preferably at least 0.06% by weight, more preferably at least 0.09% by weight, especially at least 0.
It is 12 mass%. The amount of nitrogen derived from the dispersant is
There is a tendency not to exceed 0.2% by mass.

In each case the oil composition has a phosphorus content of less than 0.09% by weight based on the weight of the oil composition, and the oil composition does not contain a dispersant viscosity index improver. The nitrogen content therein is preferably at least 0.045 wt%, more preferably at least 0.5 wt%, such as at least 0.055 wt%, advantageously at least 0.0, based on the weight of the oil composition.
6% by weight, in particular at least 0.065% by weight, for example at least 0.08% by weight, for example at least 0.1%
It is% by mass. The amount of nitrogen is preferably at most 0.3% by weight, for example at most 0.25% by weight, or at most 0.2% by weight, based on the weight of the oil composition. Nitrogen content is measured by ASTM D4629. Preferably, the nitrogen content is derived from a dispersant additive such as polyisobutenylsuccinimide. In the case where the dispersant viscosity index improver additive is present in the lubricating oil composition, the amount of nitrogen is 0. 0, based on the weight of the oil composition.
It may be less than 045% by mass, for example 0.001 to 0.04% by mass. In a preferred embodiment, the amount of nitrogen is at least 0.045 wt%, whether or not the oil composition includes a dispersant viscosity index improver additive. In the case where the oil composition comprises a dispersant viscosity index improver additive, the amount of additive is preferably 0.01-5% by weight, preferably 0.05-3, based on the weight of the oil composition. %, Especially 0.1 to 2% by weight.

Co- Additives Other additives may also be present in the oil composition of the present invention. Suitable auxiliary additives in the present invention include:
Viscosity index improvers, corrosion inhibitors, other oxidation inhibitors or antioxidants, rust inhibitors or rust inhibitors, antiwear agents, pour point depressants, demulsifiers and defoamers. Viscosity index improvers (or viscosity improvers) impart high and low temperature workability to lubricating oils, which are stable shear at elevated temperatures.
And retains an acceptable viscosity or pour point at low temperatures. Compounds suitable for use as viscosity modifiers are generally high molecular weight hydrocarbon polymers,
Polyesters such as polymethacrylate; poly (ethylene-co-propylene) polymers and closely related modifiers (so-called olefin copolymers); hydrogenated poly (styrene-co-butadiene or -isoprene) polymers and modifiers; and Esterified poly (styrene-c
o-maleic anhydride) polymer. Oil-soluble viscosity improving polymers generally have a number average molecular weight of at least 15,000 to 1,000,000, preferably 2 as measured by gel permeation chromatography or light scattering.
It is 50,000 to 600,000. “Chemistry & Te
chnology of Lubricants ”, editedby RM Mortier a
nd ST Orzulik, First edition, 1992, Blackie Aca
The disclosure content of Chapter 5 of demic & Professional shall be included in this specification.

The corrosion inhibitor reduces decomposition of the metal part due to contact with the lubricating oil composition. Thiadiazoles such as US-A-2,719,125, US-A-2,719,126 and US-A
No. 3,087,932 is an example of a corrosion inhibitor for lubricating oil. Antioxidants or antioxidants are used,
Mineral oils have a reduced tendency to deteriorate and evidence of such deterioration is, for example, the formation of varnish-like deposits and sludges on metal surfaces, and increased viscosity. Suitable oxidation inhibitors include sulfurized alkylphenols and their alkali or alkaline earth metal salts; hindered phenols; diphenylamines; phenylnaphthylamines; and phosphosulfurized or sulfurized hydrocarbons. Other oxidation inhibitors or antioxidants that can be used in the lubricant include oil soluble copper compounds. Copper may be blended in oil as a suitable oil-soluble copper compound. Oil-soluble means that the compound is oil-soluble under normal blending conditions in the oil or additive package. Copper may be in the form of, for example, dihydrocarbylthio- or dithio-phosphate. Alternatively, copper can be added as a copper salt of a synthetic or natural carboxylic acid, such as a _C8-18 fatty acid, an unsaturated acid or a branched carboxylic acid. Also useful are oil soluble copper dithiocarbamates, sulfonates, phenates and acetylacetonates. Examples of particularly useful copper compounds are:
Basic derived from alkenyl succinic acid or anhydride,
Neutral or acidic copper Cu ^I and / or Cu ^II salt. Copper antioxidants are generally used in the final lubricating composition in amounts of about 5 to 500 ppm by weight of copper.

A rust inhibitor selected from the group consisting of nonionic polyoxyalkylene polyols and their esters, polyoxyalkylene phenols, and anionic alkyl sulfonic acids can be used. Antiwear agents, as the name implies, reduce wear of metal parts.
Zinc dihydrocarbyl dithiophosphate (ZDDP) is very widely used as an antiwear agent. An example of ZDDP for use in oil-based compositions is the formula Zn [S
P (S) (OR ¹ ) (OR ² )] ₂ (wherein R ¹ and R ² are
Those having 1 to 18 carbon atoms, preferably 2 to 12 carbon atoms). Sulfur- and molybdenum-containing compounds are also examples of antiwear additives. Also suitable are ashless phosphorus- and sulfur-containing compounds. What are known as pour point depressants, or lube oil flow improvers, lower the minimum temperature at which a fluid will flow or can be poured. Such additives are well known. Foam control can be achieved with polysiloxane type defoamers such as silicone oils or polydimethylsiloxanes.

Small amounts of demulsifier compounds may be used.
Preferred demulsifiers are described in EP-A-0 330 522. It is obtained by reacting an adduct obtained by the reaction of a polyhydric alcohol and a bis-epoxide with an alkylene oxide. Some of the above additives may be multifunctional; thus, for example, a single additive may act as a dispersant-oxidation inhibitor. This approach is well known and need not be discussed further herein. Preferably, an antiwear agent, such as a metal salt of dihydrocarbyl dithiophosphate, such as
Zinc dihydrocarbyl dithiophosphate may be present in the lubricating oil composition of the present invention. When the lubricating composition comprises one or more of the above additives, including detergents, each additive is typically blended into the base oil in an amount that allows the additive to perform its desired function. To be done. Typical effective amounts of those additives, when used in a lubricant, are:

[0042] *% By weight of active ingredient based on final lubricating oil composition

The additives can be introduced into the base oil by any convenient method. Thus, each additive can be added directly to the oil by dispersing or dissolving it in the oil at the desired level of concentration. Such blending may occur at ambient or elevated temperatures. When multiple additives are used, one or more additive packages (known as additive compositions or concentrates) containing the additives are produced, thereby providing a viscosity improver, It is desirable, but not essential, to add several additives at the same time to the base oil to form the lubricating oil composition, except for the multifunctional viscosity improver and the pour point depressant. The dissolution of the additive package in the lubricating oil is
And can be facilitated by mixing with mild heating, but is not required. The additive package is typically formulated to contain the additive in an amount suitable to provide the desired concentration in the final formulation when combined with a predetermined amount of basestock. Will be done. The nitrogen content of such additive concentrates is generally 0.5 to 1.5% by weight, based on the weight of the additive concentrate,
It is preferably 0.7 to 1.0% by mass. Thus, one or more detergents, along with other desired additives, may be added to a small amount of base oil or other compatible solvent (eg carrier oil or diluent oil), based on the additive package. For example, 2.5-90% by weight, and preferably 5-75% by weight, and most preferably 8-60.
Additive packages can be formed that contain the appropriate percentages by weight of additive, with the balance being diluent. The final formulation may typically contain from 5 to 40% by weight of the additive package, the balance being diluent.

The amount of additives in the final lubricating oil composition will generally depend on the type of oil composition, for example, a heavy duty diesel engine lubricating oil composition, based on the weight of the oil composition, 2 -20 mass%, preferably 5-18 mass%, more preferably 7-16 mass%,
For example, it has 8 to 14 mass% of additive. Therefore, the method of producing the oil composition of the present invention comprises mixing an oil having a lubricating viscosity and one or more predetermined compounds, or an additive package containing one or more predetermined compounds. Can be included. It will be appreciated that the additives, including two or more detergents, after the two or more additives have been introduced into the oil composition, an interaction may occur between them. The interaction can occur either in the mixing step or in the conditions to which the composition is subsequently applied, including the use of the composition in its working environment. Interactions may also occur when additional auxiliary additives are added to the composition of the invention or to the oil components. Such interactions may include interactions that alter the chemical structure of the additive. Thus, the compositions of the present invention include, for example, compositions in which interaction occurs between any of the additives, and compositions in which no interaction occurs, for example, between components mixed in oil.

As used herein: The term "comprising" as used herein is intended to identify the presence of the stated features, integers, steps or components, but one or more other features. Does not exclude the presence or addition of integers, steps, components or combinations thereof. As used herein, the term "oil soluble" or "oil dispersible"
Does not mean that the additives are soluble, soluble, miscible or suspendable in oil in all proportions. However, they mean that the additives are, for example, soluble or stable dispersible in the oil to the extent that they exert their intended effect in the environment in which the oil composition is used. . Furthermore, the further introduction of other additives, such as those mentioned above, may affect the solubility or dispersibility of the additives. "Major amount" means greater than 50% by weight of the composition. "Small amount" means 50% by mass of the composition
Means less than, both for the additives mentioned and for the total weight% of all additives present in the composition, calculated as the active ingredient of the additive. "TBN" is the total base number as measured by ASTM D2896. All percentages stated are weight percentages on an active ingredient basis, ie without regard to carrier or diluent oil, unless stated otherwise. The abbreviation SAE is
Means the Society of Automotive Engineers, which classifies lubricating oils by viscosity grade. The invention is illustrated by the following examples, without being limited thereto.

[0046]

EXAMPLES Lubricating oil compositions, each composition being SAE 5W3
0 lubricating oil composition was blended by known methods. Each oil composition contained a detergent composition containing a salicylate detergent; zinc dihydrocarbyl dithiophosphate; and a borated dispersant. Therefore, each oil composition was compared to each other, which shows that Examples 1 and 2 contained a friction modifier: In Example 1, glycerol monooleate was added as a friction modifier at 0. 3% by mass, on the other hand, in Example 2, the friction reducing agent contains the same additive except that it contains trinuclear molybdenum dithiocarbamate in an amount of 450 ppm of molybdenum. A lubricating oil composition (Comparative Example A, Example 1 and Example 2) was applied to a total driveline rig including a Volvo FH-12 liter heavy duty diesel engine with a transmission including a gearbox and a spindle.
The fuel economy in the line rig) was tested. The rig is based on the widespread use of electronic engine management systems, which, to some extent, enable the communication of transaxles and transmissions via a CAN (Control Area Network) as a full driveline rig. is there. This rig is a “Neues F & E-Zentrum fur
Antriebsstrang-Schmierung ”by Peter Ahrweiler and
Gerd Rentel, ATZ Automobiletechnische Zeitschrif
t, 100 (1998), 3, pages 202-209.
One of the main advantages of full driveline rigs is their low error form for measuring heavy duty diesel fuel economy. Fleet trial
Elimination of error sources, such as driver variations, tire pressure variations, drive cycle variations and aerodynamic variations are essential if rigorous fuel economy measurements are to be made. This is currently possible by using full driveline rigs. Historical data is
Economic measurements higher than 0.29% have 95% confidence intervals (c
It is realistic in the onfidence interval). Fuel economy measurements are quoted as percent improvement compared to a lubricating oil composition having the same additive components as Comparative Example A, but blended into SAE 15W40 grade. Table 1 summarizes the results obtained,
It has been shown that the use of friction modifiers in heavy duty diesel engine lubricating oil compositions improves the fuel economy of the engine: the improvement is almost twice that of oil compositions without friction modifiers. (Comparative Example A with Example 1 or Example 2). Table 1 also describes some properties of the oil composition.

Table 1: 1-Percentage improvement in fuel economy for lubricating oil compositions blended in SAE 15W40 grade 2-2 Average of two measurements

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C10M 133/04 C10M 133/04 133/08 133/08 133/16 133/16 135/10 135/10 135 / 12 135/12 135/18 135/18 135/30 135/30 137/10 137/10 A // C10N 10:02 C10N 10:02 10:04 10:04 10:12 10:12 20:00 20 : 00 Z 20:02 20:02 30:06 30:06 40:25 40:25 (72) Inventor Charles H. Bovington England Oxfordshire SSN 7 7 S Farindon Longcott Kings Lane Ashborn (72) Inventor Steven Arousmith United Kingdom Oxfordshire Ox 119 IA Oxon Didcot Saxons Way 16 (72) Inventor Rebecca Seacastle United Kingdom Drington Ox 5 1B L Oxford 106 Sea Flat 1 (72) Inventor Peter Wrench Oxford Ox 12 7 Lx Wantage Grove Glebe Gardens 31 F Term (Reference) 4H104 BB17C BB24C BB34C BB35C BE02C BE04C BE11C BG06BG BG16C BH07C DA02A EA02A EA02Z EA30A EB02 LA03 PA42

Claims (10)

[Claims] 1. An effective amount of a heavy duty diesel engine lubricating oil composition capable of reducing a coefficient of friction under mixed lubrication or boundary lubrication conditions to improve fuel economy of a heavy duty diesel engine. Use of one or more compounds. 2. A heavy duty diesel engine lubricating oil composition comprising a large amount of oil having a lubricating viscosity and the following (A) to (C) added thereto: (A) mixed lubrication or boundary lubrication conditions. An effective amount of one or more compounds capable of reducing the coefficient of friction below; (B) a detergent composition comprising a small amount of a metal salt of an aromatic carboxylic acid; and (C). It contains a small amount of a dispersant additive and has a nitrogen content of at least 0.0 based on the weight of the composition.
6% by weight of the composition. 3. The at least API CG-4 performance standard and / or the ACEAE2-96 performance standard is met.
The oil composition according to. 4. SAE 5W-X or SAE 0W-X
The oil composition according to claim 2 or 3, which is in the form of a lubricating oil composition, wherein X is 20, 30, 40 or 50. 5. The oil composition according to any one of claims 2 to 4, wherein the base blend viscosity at 100 ° C is at least 8.2 mm ² s ^-1 . 6. At least one of the compounds has a polar head group and a lipophilic hydrocarbyl chain.
The oil composition according to any one of 5 above. 7. The oil composition according to claim 2, wherein at least one of the compounds is a molybdenum compound. 8. A heavy duty diesel engine additive concentrate composition comprising a diluent and the following (A):
(C): (A) one or more compounds capable of reducing the friction coefficient under mixed lubrication or boundary lubrication conditions; (B) a detergent composition containing a metal salt of an aromatic carboxylic acid And one or more additives including (C) a dispersant additive, and the proportion of each is 2 to 20% by mass when the heavy duty diesel engine lubricating oil composition contains the additive. The heavy duty diesel engine lubricating oil composition of claim 2 as such. 9. A combination of a heavy duty diesel engine in land transportation means and a lubricating oil composition according to any one of claims 2 to 7, wherein the engine has a total displacement of at least 6.5 liters. And the displacement per cylinder is at least 1.0 liter. 10. A method of lubricating a heavy duty diesel engine in land transportation means, the engine having a total displacement of at least 6.5 liters.
And a method of supplying the lubricating oil composition according to any one of claims 2 to 7 to the engine, wherein the displacement per cylinder is at least 1.0 liter.