EP1612258B1 - Utilisation d'additifs dans une composition d'huile lubrifiante pour l' entreinment automobile - Google Patents

Utilisation d'additifs dans une composition d'huile lubrifiante pour l' entreinment automobile Download PDF

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Publication number
EP1612258B1
EP1612258B1 EP05011429.7A EP05011429A EP1612258B1 EP 1612258 B1 EP1612258 B1 EP 1612258B1 EP 05011429 A EP05011429 A EP 05011429A EP 1612258 B1 EP1612258 B1 EP 1612258B1
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EP
European Patent Office
Prior art keywords
oil
lubricant composition
zinc
alkaline earth
earth metal
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Application number
EP05011429.7A
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German (de)
English (en)
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EP1612258A3 (fr
EP1612258A2 (fr
Inventor
Tomohiro Kato
Narihiko Yoshimura
Kazuo Yamamori
Koji c/o TonenGeneral Sekiyu K.K Saito
Tetsuzo Yoneda
Yoshikazu Yamamoto
Akihiko Ichikawa
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Tonen General Sekiyu KK
Toyota Motor Corp
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Tonen General Sekiyu KK
Toyota Motor Corp
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Publication of EP1612258A3 publication Critical patent/EP1612258A3/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/027—Neutral salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/028—Overbased salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/144—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings containing hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbasedsulfonic acid salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure

Definitions

  • the present invention pertains to a lubricant composition for automobile gears, especially for a manual speed-change gear.
  • WO 00/70001 discloses the use high boron formulations as fluids for continuously variable transmissions to improve friction and anti-seizure properties and US 6.503.872 discloses manual transmission lubricants comprising a major amount of an oil of lubricating viscosity, at least one metal thiophosphate, at least one phosphite, at least one basic salt of an acidic organic compound and, optionally, at least one neutral or basic alkaline earth metal salt of a phenol or an aromatic carboxylic acid.
  • the objective of the present invention is to solve the aforementioned problems relating to the prior art for improving mileage by providing a type of lubricant composition for automobile gears, especially a lubricant composition for a manual speed-change gear, characterized by the fact that the mileage can be improved by lowering the viscosity of the lubricant and, at the same time, the durability of wear resistance can be maintained.
  • the present inventors have performed extensive research. As a result of this research, it was found that when an specific alkaline earth metal salt and zinc dithiophosphate are mixed at a prescribed ratio, it is possible to obtain a lubricant composition that has a 40°C kinematic viscosity of 40 mm 2 /s or lower, and, at the same time, that has excellent wear resistance for steel parts and, especially, for aluminum parts, equal to or better than the wear resistance of a conventional commercially available lubricant with a 40°C kinematic viscosity of 76 mm 2 /s.
  • the present invention was achieved based on this finding.
  • the present invention provides the use of a at least one alkaline earth metal salt and a zinc dithiophosphate in a lubricant composition to increase the wear resistance of manual speed-change gears, characterised in that the alkaline earth metal salt is magnesium sulfonate, the amount of magnesium element based on the total weight of lubricant composition is of 0.1 wt% or more, the elemental ratio of zinc to alkaline earth metal from the additive is in the range of 0.2 to 1.0 and the kinematic viscosity at 40°C of the lubricant composition is 40 mm 2 / s or less.
  • the alkaline earth metal salt is magnesium sulfonate
  • the amount of magnesium element based on the total weight of lubricant composition is of 0.1 wt% or more
  • the elemental ratio of zinc to alkaline earth metal from the additive is in the range of 0.2 to 1.0
  • the kinematic viscosity at 40°C of the lubricant composition is 40 mm 2
  • magnesium sulfonate as organic acid alkaline earth metal salt, in a prescribed quantity in a base oil with a low viscosity, and by mixing said organic acid alkaline earth metal salt and zinc dithiophosphate at a prescribed ratio, it is possible to obtain a type of lubricant for a manual speed-change gear that can display significant wear resistance for not only steel parts but also aluminum sliding parts, and that has an excellent effect in increasing mileage.
  • the present invention provides the use of a lubricant composition for manual speed-change gear, characterized by the fact that the lubricant composition is composed of a low-viscosity base oil as well as an organic acid alkaline earth metal salt and zinc dithiophosphate in a prescribed ratio.
  • the preferable embodiments are the following :
  • the lubricant composition for a manual speed-change gear contains a base oil as well as an organic acid alkaline earth metal salt, zinc dithiophosphate, and other additives for a speed-change gear that maintain the extreme-pressure performance, etc., added to the base oil.
  • the base oil as a structural component of the lubricant composition for a manual speed-change gear may be a conventional base oil for a lubricant or another usable type, and there is no special limitation on the type. More specifically, examples include mineral oil base oils, GTL (gas to liquid)-based base oil, synthetic oil-based base oil, as well as mixed base oils.
  • mineral oil base oils examples include solvent refined mineral oils or hydrogenation treated oils and other mineral oils prepared by treatment of a lubricant distillation fraction obtained by reduced pressure distillation of residual oil from an ambient pressure distillation device for paraffin-based, intermediate-based, or naphthene-based feed oil by means of solvent refinement, hydrogenation decomposition, hydrogenating treatment, hydrogenating refinement, solvent dewaxing, contact dewaxing, white clay treatment or another refinement method, mineral oil prepared by treatment in said refinement process of de-bitumen oil prepared by solvent de-bitumen treatment of reduced pressure distillation residual oil, mineral oil obtained by isomerizing a wax component, as well as mixed oils thereof.
  • solvents for solvent dewaxing include liquefied propane, MEK (methyl ethyl ketone)/toluene, and the like.
  • MEK methyl ethyl ketone
  • contact dewaxing for example, a shape-selecting zeolite or the like may be used as the dewaxing solvent.
  • Examples of refined base oil substrates prepared in the above include different types of light neutral oils, middle neutral oils, heavy neutral oils, bright stock, etc., having different viscosity levels. One may blend said substrates appropriately to prepare the mineral oil-type base oil.
  • GTL-type base oils examples include the lubricant fraction separated from liquid product obtained from natural gas or another raw material using a GTL process, the lubricant fraction obtained by means of hydrogenation decomposition of generated wax, etc.
  • a synthetic oil base oil one may select from the following group of compounds to obtain an appropriate viscosity property for the lubricant composition for a manual speed-change gear: a poly( ⁇ -olefin) (such as poly(1-hexene), poly(1-octene), poly(1-decene), and their mixtures); polybutene; an ethylene-alkylene copolymer; an alkyl benzene (such as dodecylbenzene, tetradecylbenzene, di(2-ethylhexyl)benzene, dinonylbenzene, etc.); a polyphenyl (such as biphenyl, alkylated polyphenyl, etc.); an alkylated diphenylether, an alkylated diphenyl sulfide, and their derivatives; esters formed from dibasic acids (such as phthalic acid, succinic acid, alkyl succinic acid, al
  • the base oil of the lubricant composition for a manual speed-change gear in the present invention is prepared by selecting one of said various types of base oil substrates, either alone or as a mixture of several, such that the 40°C kinematic viscosity of the lubricant composition is 40 mm 2 /s or lower, or preferably 30 mm 2 /s or lower.
  • the base oil has the desired viscosity and other properties required for a lubricant. Consequently, the viscosity of the base oil should be appropriate to provide a lubricant composition of the present invention.
  • the viscosity depends on the composition of the additives, etc., and can be selected preferably from those having a 40°C kinematic viscosity in the range of 25-40 mm 2 /s.
  • the alkaline earth metal sulfonate is an alkaline earth metal salt of a petroleum sulfonic acid, long-chain alkylbenzene sulfonic acid, and alkyl napththalene sulfonic acid. It is a component of the composition for a manual speed-change gear of the present invention.
  • a typical example is represented by formula (1):
  • M represents an alkaline earth metal, such as magnesium.
  • R 1 and R 2 are C1-30 hydrocarbon groups, which may be identical or different from each other. At least one of the hydrocarbon groups should be a C6 or higher alkyl group. Examples of preferable hydrocarbon groups include C1-18 straight chain or branched alkyl groups; C2-18 straight chain or branched alkenyl groups; C6-30 cycloalkyl groups; C6-18 aryl groups, etc. The aryl groups are optionally substituted with C1-12 alkyl groups or C2-12 alkenyl groups. Especially preferable hydrocarbon groups include C6-18 straight-chain or branched alkyl groups.
  • perbasic salts are preferred. However, it is also possible to use a normal salt or basic salt.
  • a perbasic salt has excess hydroxide or carbonate dispersed in colloidal form in the sulfonate. It is preferred that the total base value be 200 mgKOH/g or higher.
  • the quantity of alkaline earth metal sulfonate should be appropriate so that the magnesium quantity in the oil with respect to the total weight of the composition is 0.1 wt% or more, or preferably in the range of 0.15-0.6 wt%, or more preferably in the range of 0.15-0.3 wt%.
  • R 1 and R 2 represent C1-20 hydrocarbon groups, which may be identical or different from each other.
  • hydrocarbon groups include C1-20 alkyl groups; C2-20 alkenyl groups; C6-20 cyclohexyl groups, aryl groups, alkyl aryl groups, aryl alkyl groups, etc.
  • Specific examples include a methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, stearyl group, oleyl group, butylphenyl group, nonylphenyl group, etc., as well as branched alkyl groups thereof, etc.
  • Preferable hydrocarbon groups are C3-18 alkyl groups.
  • alkyl groups include primary and secondary alkyl groups. More specifically, it is preferred that compounds having the following groups be used: isopropyl group, isobutyl group, secondary butyl group, pentyl group, hexyl group, 4-methyl-2-pentyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, as well as dodecyl group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group, and other alkyl groups.
  • zinc dithiophosphate examples include zinc diisopropyl dithiophosphate, zinc diisobutyl dithiophosphate, zinc di-secondary butyl thiophosphate, zinc di(n-pentyl) dithiophosphate, zinc di(n-hexyl) dithiophosphate, zinc di(4-methyl-2-pentyl) dithiophosphate, zinc di(n-octyl) dithiophosphate, zinc di(2-ethylhexyl) dithiophosphate, zinc di(n-nonyl) dithiophosphate, zinc di(n-decyl) dithiophosphate, zinc di(n-dodecyl) dithiophosphate, zinc di(n-tridecyl) dithiophosphate, zinc di(n-tetradecyl) dithiophosphate, zinc di(n-hexadecyl) dithiophosphate, zinc di(n-octadecyl
  • zinc dithiophosphate containing primary and secondary alkyl groups is preferred.
  • a zinc dithiophosphate having primary alkyl groups as the main component and a zinc dithiophosphate having secondary alkyl groups as the main component appropriately to adjust the proportions of the primary and secondary alkyl groups.
  • the quantity of said zinc dithiophosphate in the lubricant composition should be appropriate corresponding to an elemental zinc quantity in the oil in the range of 0.05-0.5 wt%, or preferably in the range of 0.1-0.2 wt%.
  • the quantity of said organic acid alkaline earth metal salt should be appropriate corresponding to an alkaline earth metal element quantity in the oil of 0.1 wt% or more; and the quantity of said zinc dithiophosphate should be appropriate corresponding to an elemental zinc quantity in the oil in the range of 0.05-0.5 wt%.
  • the ratio of the quantity of element zinc in the oil to the quantity of alkaline earth metal element in the oil is from 0.2 1 and where, the quantity of elemental zinc in the oil is derived from said zinc dithiophosphate, and the quantity of alkaline earth metal element in the oil is derived from said organic acid alkaline earth metal salt.
  • the preferred ratio of the quantity of elemental zinc in the oil to the quantity of alkaline earth metal element in the oil is from 0.3 to 0.8.
  • the wear resistance decreases. On the other hand, if said ratio is less than 0.2, the wear resistance is worsened, and this is undesired.
  • An extreme-pressure agent is added in the lubricant composition for a manual speed-change gear of the present invention to maintain the extreme-pressure performance.
  • other additives appropriately, such as an ash-free dispersing agent, friction-adjusting agent, dissolving agent, rubber-expansion agent, fluid point lowering agent, and oxidation inhibitor.
  • other additives may be added as needed.
  • extreme pressure agents examples include an olefin polysulfide, sulfurized oils and fats, dialkyl polysulfide, and other sulfur-based compounds; alkyl and allyl phosphate, alkyl and allyl phosphite, amine phosphate, and other phosphorus-based compounds; paraffin chloride, and other chlorine-based compounds. They may be used either alone or as a mixture of several. Also, a combination of a sulfur based composition and a phosphorus based composition may be used. For example, a combination of an olefin sulfide and an alkyl phosphate may be used. The quantity is usually in the range of 0.05-3 wt%.
  • ash-free dispersing agents examples include polybutenyl succinic acid imide-based compounds, polybutenyl succinic acid amide-based compounds, benzyl amine-based compounds, succinic ester-based compounds, succinic ester-acid-based compounds, etc., usually added in a quantity in the range of 0.05-7 wt%.
  • friction-adjusting agents examples include organic molybdenum-based compounds, fatty acids, higher alcohols, fatty acid esters, oils and fats, amines, polyamide, sulfide ester, phosphates, acidic phosphates, phosphites, phosphate amine salts, etc. They are usually added in a quantity of 0.05-5 wt%.
  • defoaming agents examples include a dimethyl polysiloxane, polyacrylate, etc. They may be added appropriately in a small quantity.
  • fluid point decreasing agents examples include an ethylene-vinyl acetate copolymer, condensate of chlorinated paraffin and naphthalene, condensate of chlorinated paraffin and phenol, polymethacrylate, polyalkyl styrene, etc. Usually, the quantity is in the range of 0.1-10 wt%.
  • oxidation inhibitors examples include an alkylated diphenylamine, phenyl- ⁇ -naphthylamine, alkylated- ⁇ -naphthylamine, and other amine-based oxidation inhibitors, 2,6-ditertiary butylphenol, 4,4'-methylene bis(2,6-ditertiary butylphenol), and other phenolic oxidation inhibitors, as well as zinc dithiophosphate, etc.
  • the quantity is usually in the range of 0.05-5 wt%.
  • Zinc dithiophosphate Mixture having primary/secondary alkyl groups.
  • Magnesium sulfonate Perbasic salt with total base value of 400 mgKOH/g.
  • Extreme-pressure agent Sulfur-phosphorus-based package containing sulfur-based and phosphorus-based extreme-pressure agents, as well as an ash-free dispersing agent, friction-adjusting agent, defoaming agent, etc.
  • magnesium sulfonate was added at a quantity corresponding to a content of elemental Mg in the oil of 0.15 wt%
  • zinc dithiophosphate was added in a quantity corresponding to a content of elemental Zn in the oil of 0.1 wt%, with the ratio of the quantity of elemental Zn in the oil to the quantity of elemental Mg in the oil adjusted to 0.67.
  • sulfur-phosphorus based (S-P) package was added in a quantity of 7.1 wt%, forming oil sample A with a 40°C kinematic viscosity of 30 mm 2 /s.
  • the friction width measured using the aforementioned wear-resistance evaluation method was found to be 0.74 mm.
  • Oil sample B with a 40°C kinematic viscosity of 30 mm 2 /s was prepared in the same way as in Example 1, except that the magnesium sulfonate was added in a quantity corresponding to a quantity of elemental Mg in the oil of 0.3 wt%, and the zinc dithiophosphate was added in a quantity corresponding to a quantity of elemental Zn in the oil of 0.2 wt%, with the ratio of elemental Zn to elemental Mg in the oil being 0.67.
  • the friction width measured using the aforementioned wear-resistance evaluation method was found to be 0.80 mm.
  • Oil sample C with a 40°C kinematic viscosity of 30 mm 2 /s was prepared in the same way as in Application Example 1, except that the magnesium sulfonate was added in a quantity corresponding to a quantity of elemental Mg in the oil of 0.3 wt%, and the zinc dithiophosphate was added in a quantity corresponding to a quantity of elemental Zn in the oil of 0.1 wt%, with the ratio of elemental Zn to elemental Mg in the oil being 0.33.
  • the friction width measured using the aforementioned wear-resistance evaluation method was found to be 0.80 mm.
  • oil sample (a) A low-viscosity refined mineral oil was used to prepare oil sample (a) with a 40°C kinematic viscosity of 30 mm 2 /s.
  • the ratio of the quantity of elemental Zn in the oil to the quantity of elemental Ca in the oil was the same as that of the commercially available oil used in Comparative Example 1-1, that is, 5.00.
  • the friction width of oil sample (a) measured using the wear-resistance evaluation method was found to be 1.05 mm.
  • magnesium sulfonate and zinc dithiophosphate were added in the quantities listed in Table 1, and, as other additives, an S-P-based package corresponding to GL-4 was added in a quantity of 7.1 wt% to obtain oil samples (b)-(g).
  • Example 1 was compared with Comparative Examples 2 and 3 with the same quantity of elemental Mg.
  • the ratio of the quantity of elemental Zn in the oil to the quantity of elemental Mg in the oil is 0.67, that is, within the aforementioned prescribed range.
  • the ratio of the quantity of elemental Zn in the oil to the quantity of elemental Mg in the oil is 1.33, that is, outside the aforementioned range, and the wear resistance is much worse.
  • the lubricant composition for a manual speed-change gear of the present invention with the aforementioned constitution can be used not only as a lubricant for an automobile driving system consisting of a manual transmission (MT), but also for a manual transmission axle (MTX) in transfer, a differential (Dif.), etc. Consequently, it can be used as a common lubricant for said MT, MTX and differential for FF cars, etc.
  • MT manual transmission
  • MTX manual transmission axle
  • Dif. differential
  • the lubricant composition for a manual speed-change gear of the present invention contributes to protection of the environment since it is an environmentally friendly lubricant by realizing low viscosity. Also, it can be used as a high-quality lubricant for an automobile driving system, such as a manual transmission, manual transmission axle, etc. Consequently, it greatly contributes to the petroleum and automobile industries with regard to manufacture and application.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Claims (4)

  1. Utilisation d'au moins un sel de métal alcalino-terreux et d'un dithiophosphate de zinc dans une composition de lubrifiant pour augmenter la résistance à l'usure d'engrenages de changements de vitesses manuels, caractérisée en ce que le sel de métal alcalino-terreux est du sulfonate de magnésium, la quantité de magnésium, par rapport au poids total de la composition de lubrifiant, est de 0,1 % en poids ou plus, le rapport élémentaire du zinc au métal alcalino-terreux de l'additif est dans la plage de 0,2 à 1,0 et la viscosité cinématique à 40°C de la composition de lubrifiant est de 40 mm2/s ou moins.
  2. Utilisation selon la revendication 1, dans laquelle la quantité de métal alcalino-terreux est comprise entre environ 0,15 % en poids et environ 0,6 % en poids.
  3. Utilisation selon la revendication 1 ou 2, dans laquelle la viscosité cinématique à 40°C est de 30 mm2/s ou moins.
  4. Utilisation selon l'une quelconque des revendications 1 à 3, dans laquelle le rapport du zinc au métal alcalino-terreux est de 0,3 à 0,8.
EP05011429.7A 2004-06-01 2005-05-27 Utilisation d'additifs dans une composition d'huile lubrifiante pour l' entreinment automobile Active EP1612258B1 (fr)

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JP2004163106A JP4768234B2 (ja) 2004-06-01 2004-06-01 自動車用駆動系潤滑油組成物

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EP1612258A3 EP1612258A3 (fr) 2008-05-28
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JP4768234B2 (ja) 2011-09-07
EP1612258A3 (fr) 2008-05-28
EP1612258A2 (fr) 2006-01-04
JP2005343954A (ja) 2005-12-15
US20050267002A1 (en) 2005-12-01

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