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EP0622444B2 - Utilisation de composes phosphoriques inorganiques pour ameliorer les proprietes frictionnelles de lubrifiants pour embrayages ou freins a disque humide une huile lubrifiante pour embrayages ou freins a disque humide - Google Patents
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EP0622444B2 - Utilisation de composes phosphoriques inorganiques pour ameliorer les proprietes frictionnelles de lubrifiants pour embrayages ou freins a disque humide une huile lubrifiante pour embrayages ou freins a disque humide - Google Patents

Utilisation de composes phosphoriques inorganiques pour ameliorer les proprietes frictionnelles de lubrifiants pour embrayages ou freins a disque humide une huile lubrifiante pour embrayages ou freins a disque humide Download PDF

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Publication number
EP0622444B2
EP0622444B2 EP94908130A EP94908130A EP0622444B2 EP 0622444 B2 EP0622444 B2 EP 0622444B2 EP 94908130 A EP94908130 A EP 94908130A EP 94908130 A EP94908130 A EP 94908130A EP 0622444 B2 EP0622444 B2 EP 0622444B2
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EP
European Patent Office
Prior art keywords
acid
use according
lubricant
wet
friction coefficient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94908130A
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German (de)
English (en)
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EP0622444A4 (fr
EP0622444A1 (fr
EP0622444B1 (fr
Inventor
Kuniaki Nippon Cooper Company Kaga
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Afton Chemical Japan Corp
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Afton Chemical Japan Corp
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Publication of EP0622444A4 publication Critical patent/EP0622444A4/fr
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    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/24—Compounds containing phosphorus, arsenic or antimony
    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/04—Hydroxy compounds
    • C10M129/06—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/08—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least 2 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/04—Hydroxy compounds
    • C10M129/10—Hydroxy compounds having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
    • C—CHEMISTRY; METALLURGY
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    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
    • C—CHEMISTRY; METALLURGY
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    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/68—Esters
    • C10M129/76—Esters containing free hydroxy or carboxyl groups
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    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M133/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M133/08—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups
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    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/38—Heterocyclic nitrogen compounds
    • C10M133/44—Five-membered ring containing nitrogen and carbon only
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    • C10M133/38—Heterocyclic nitrogen compounds
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    • C10M133/46—Imidazoles
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    • C10M133/52—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of 30 or more atoms
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    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/02—Sulfurised compounds
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    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/02—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic oxygen-containing compound
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    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/06—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic nitrogen-containing compound
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    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
    • C10M145/12—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate monocarboxylic
    • C10M145/14—Acrylate; Methacrylate
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    • C10M155/00—Lubricating compositions characterised by the additive being a macromolecular compound containing atoms of elements not provided for in groups C10M143/00 - C10M153/00
    • C10M155/02—Monomer containing silicon
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    • C10M159/12—Reaction products
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Definitions

  • the present invention relates to the use of an inorganic phosphorus compound to improve the frictional properties of a wet-clutch or wet-brake lubricant composition.
  • a wet clutch or a wet brake of a power transmission device such as an automatic transmission for an automobile, an agricultural machine, a construction machine, or other industrial machines transmits a driving force by regulating the frictional properties of a plate on the driving side and a plate on the driven side, wherein the frictional properties of a lubricant employed for lubrication have a very important bearing.
  • a wet clutch is taken up for explanation as a representative in the following description. Since inappropriate frictional properties cause a power transmission loss in the clutch and greatly affect the comfort on operating the machine, it is important for the lubricant to have appropriate frictional properties.
  • the friction control of a wet clutch of this type involves three friction coefficients, i.e. dynamic friction coefficient, break-away friction coefficient, and static friction coefficient, and it is conventionally required for the regulation of the friction in a wet clutch of this type to raise the power transmission torque (called as dynamic friction coefficient in view of the friction coefficient and usually expressed as ⁇ d; hereinafter referred to as ⁇ d), and at the same time, to lower the friction transmission torque at the engaging point of the wet clutch (called as break-away friction coefficient in view of the friction coefficient and usually expressed as ⁇ 0; hereinafter referred to as ⁇ 0). If the ratio of ⁇ 0/ ⁇ d exceeds 1, a transmission shock is produced to arouse discomfort at the change of speed (when the clutch is operated). If the ratio is 1 or less, no such a transmission shock is produced and the transmission properties which do not impair the comfort are obtained.
  • the power transmitting capacity of the wet clutch is also of importance, and in this connection, it is importantto increase the static friction torque (called as static friction coefficient and expressed as ⁇ s to be distinguished from the break-away friction coefficient; hereinafter referred to as ⁇ s).
  • the lubricant is required to show good durability in a long-time use while undergoing little aging change in the friction coefficient and to suppress the transmission shock over a long period of time, however, the addition of a large amount of a friction modifier, etc. to obtain this effect is associated with a problem of lowering in ⁇ s.
  • the ⁇ 0/ ⁇ d ratio and the ⁇ s are in a trade-off relation with each other as described heretofore, and accordingly, a variety of designs and inventions have hitherto been made as will be described below.
  • a lock-up clutch has recently come to be used in an automatic transmission for an automobile to reduce the fuel consumption and to reduce the power loss in a torque converter and thus, the lubricant has been imposed with a still more complicated factor.
  • the problem in the lock-up clutch case is a vibration called shudder.
  • the frictional properties at different rotations have an important bearing on the suppression of the vibration and the lubricant composition need be designed to have a ratio of the change in friction coefficient ( ⁇ ) to the change in slipping velocity (v) at the time when the speed of rotation is changed, i.e., d ⁇ /dv ⁇ 0.
  • a lubricant composition comprising (A) a phosphoric ester having from 4 to 30 carbon atoms or an amine salt thereof, and (B) one compound selected from the group consisting of a sorbitan fatty acid ester, a glycerol fatty acid ester, a palm kernel oil fatty acid, a coconut oil fatty acid, a compound represented by the general formula (RCOO) 2 Zn, a mixture of a fat and oil and a fatty acid, and a reaction product of a polyalkylenepolyamine and a fatty acid.
  • a series of Japanese Patent Application (Laid-Open) Nos. 39395/1991, 39396/1991, 39397/1992, 39398/1991 and 39399/1991 propose the use of a combination of (A) one compound selected from a phosphoric ester, a phosphorous ester, and an amine salt thereof each having from 4 to 30 carbon atoms, and (B) a tertiary amine, an aliphatic dicarboxylic acid, a primary zinc thiophosphate, a succinimide, an overbased magnesium, calcium sulfonate, or the like to improve frictional properties.
  • A one compound selected from a phosphoric ester, a phosphorous ester, and an amine salt thereof each having from 4 to 30 carbon atoms
  • B a tertiary amine, an aliphatic dicarboxylic acid, a primary zinc thiophosphate, a succinimide, an overbased magnesium, calcium sulfonate, or the like
  • the present invention provides the use of an inorganic phosphorus compound which may contain sulfur atoms and/or oxygen atoms as its constituent elements, or an amine salt thereof, to improve the frictional properties of a wet-clutch or wet-brake lubricant composition as defined in claim 1.
  • the lubricant composition used in accordance with the present invention preferably satisfies the following conditions: (1) the ⁇ 0/ ⁇ d ratio is reduced to eliminate any shock arising from a speed change, (2) the ⁇ s is increased as high as possible to enhance a torque transmitting property, and (3) the vibration of a lock-up clutch is prevented, while all friction coefficients are free from the temperature dependence.
  • the lubricant composition is excellent not only in initial properties but is also durable in view of the prevention of vibration of a lock-up clutch.
  • the inorganic phosphorus compound used in accordance with the invention preferably contains a sulfur atom and/or an oxygen atom as its constituent elements, or is an amine salt thereof.
  • the lubricant used in the present invention contains at least one organic polyol compound having at least two hydroxyl groups in one molecule.
  • the above-described lubricant composition for a wet-clutch or a wet-brake may further comprise an ashless dispersing agent containing a nitrogen atom.
  • the lubricant composition used in the present invention typically comprises, as a principal component, a base oil.
  • the base oil is not particularly restricted as far as it is a base oil usually employed for a lubricant, and may be a synthetic oil, a mineral oil, or a mixture thereof.
  • the base oil preferably has a kinematic viscosity of 1x10 -6 to 8x10 -5 m 2 /s (1 to 80 cSt (centisokes)), more preferably 2x10 -6 to 5x10 -5 m 2 /s (2 to 50 cSt), at 100°C.
  • Examples of the mineral oil include a paraffin-based mineral oil, a naphthene-based mineral oil, and a paraffin-naphthene-based mineral oil, and further, a mineral oil dewaxed by a usual method or a mineral oil modified to have a high viscosity index may be used.
  • Examples of the synthetic lubricant oil include various synthetic oils such as poly- ⁇ -olefin, a low-molecular ethylene- ⁇ -olefin copolymer, polybutene, a dibasic acid ester, polyglycol, a hindered ester, alkylbenzene, and polyether.
  • a mixed oil of the above-described mineral oil and synthetic oil may also be used.
  • the inorganic phosphorus compound which may contain an oxygen atom and/or a sulfur atom as its constituent elements includes the followings.
  • Examples are phosphorous acid, phosphoric acid, hypophosphoric acid, phosphorus trioxide, phosphorus tetroxide, phosphorus pentoxide, phosphorotetrathionic acid (H 3 PS 4 ), phosphoromonothionic acid (H 3 PO 3 S), phosphorodithionic acid (H 3 PO 2 S 2 ), phosphorotrithionic acid (H 3 PO 2 S 3 ), and P 2 S 5 .
  • phosphorous acid and phosphoric acid are preferred.
  • An amine salt of an inorganic phosphorus compound can also be preferably used.
  • Examples of the amine for use in the amine salt include primary, secondary and tertiary amines, and, in particular, amines containing a tertiary alkyl group, for example, those containing tertiary carbon atoms as carbon atoms adjacent to nitrogen atoms, more specifically, those represented by R-C(CH 3 ) 2 -NH 2 (wherein R is an alkyl group having from 16 to 22 carbon atoms), are preferred. It is also possible to use a plurality of inorganic phosphorus compounds of these together.
  • the inorganic phosphorus compound is preferably contained in an amount of from 0.005 wt% to 0.1 wt%, preferably from 0.01 wt% to 0.05 wt%, in terms of the molar amount of phosphorus, based on the total lubricant oil composition, and within this range, the effect of the present invention can be achieved.
  • Examples of the organic polyol compound having at least two hydroxyl groups in one molecule include 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,2-hexanediol, 2,4-hexanediol, 2,4-octanediol, and 1,3-dodecanediol.
  • a triol, tetraol, or higher alcohol can be used as a simple substance, or as a partially esterified compound of the alcohol, such as a monoester, diester, ortriester compound.
  • a monoester, diester, ortriester compound such as a monoester, diester, ortriester compound.
  • an ester with a carboxylic acid having from 1 to 40 carbon atoms, preferably with a fatty acid having from 1 to 24 carbon atoms is used.
  • the ester is usually a mixture of mono-, di- and triesters, and it is preferred to distill and refine it by molecular distillation, etc. to convert it into a mixture of diester and monoester, or preferably a monoester of higher purity.
  • An ester of a polyhydric alcohol such as tetraol can also be used, and a mixture of di-, tri-, and tetraesters formed with the above-described acids can also be used to leave at least two hydroxyl groups in one molecule.
  • an alkylaryl group may be used or a carboxylic ester having an alkylaryl group may be formed to increase solubility in the base oil.
  • a polyhydric alcohol having an ester group may be in the form of a thioester.
  • one of the hydroxyl groups is preferably in the ⁇ , ⁇ , or ⁇ -position relative to the other hydroxyl group. Two or more of various compounds containing these hydroxyl groups may also be used.
  • the polyol compound containing at least two hydroxyl groups in one molecule is preferably contained in an amount of from 0.01 wt% to 4 wt%, preferably from 0.1 wt% to 1 wt% based on the total lubricant composition, and within this range, the effects of the present invention can be achieved.
  • the lubricant composition may contain, for the purpose of improving performance as a lubricant, additives usually employed, if desire, such as an antioxidant, a detergent-dispersant, an extreme-pressure agent, a friction modifier, an oiliness improver, an anti-wear agent, a corrosion inhibitor, a rust preventing agent, a rubber swelling agent, a defoaming agent, a pour-point depressant, and a viscosity index improver.
  • additives usually employed, if desire such as an antioxidant, a detergent-dispersant, an extreme-pressure agent, a friction modifier, an oiliness improver, an anti-wear agent, a corrosion inhibitor, a rust preventing agent, a rubber swelling agent, a defoaming agent, a pour-point depressant, and a viscosity index improver.
  • a phenol-based antioxidant As the antioxidant, a phenol-based antioxidant, an aromatic amine-based antioxidant, a zinc dithiophosphate, etc., is used, and specific examples thereof include 2,6-di-t-butyl-4-methylphenol, 4,4'-methylenebis(2,6-di-t-butylphenol), phenyl- ⁇ -naphthylamine, dialkyldiphenylamine, zinc di-2-ethylhexyldithiophosphate, zinc diamyldithiocarbamate, and pinene pentasulfide.
  • the antioxidant is added in an amount of from 0.01 wt% to 2 wt%, preferably from 0.05 wt% to 1 wt%, based on the lubricant composition.
  • the detergent-dispersant may be an ashless dispersant, a metallic detergent, or an ashless dispersant containing boron. Specific examples thereof include alkenyl succinimide- and benzylamine-type ashless dispersants, boronized polyisobutenyl succinimide- and boronized benzylamine-type ashless dispersants, metal sulfonate, metal phenate and metal salicylate.
  • the metallic detergent indicates those containing a metal such as magnesium, calcium, or barium.
  • the detergent-dispersant is added in an amount of from 0.01 wt% to 10 wt%, preferably from 0.5 wt% to 5 wt%, based on the lubricant composition.
  • the friction modifier examples include an amine compound such as oleyldiethanolamine, dodecyldiethanolamine, dodecyldipropanolamine, oleylamine, hexadecylamine, dodecyldiethylamine, dodecylethanolamine, and a mixture thereof, an amide such as oleic amide, dodecylcarboxylic acid diethanolamide, dodecylcarboxylic acid propanolamide, oleic acid diethanolamide, oleic acid propanolamide, hexadecylcarboxylic acid diethanolamide, hexadecylcarboxylic acid propanolamide, and a mixture thereof, and N-hydroxyethyl oleylimidazoline.
  • an amine compound such as oleyldiethanolamine, dodecyldiethanolamine, dodecyldipropanolamine, oleylamine, hex
  • additives other than the antioxidant, the detergent-dispersant and the friction modifier are added in such an amount as in the addition for modifying a lubricant for a wet clutch or a wet brake.
  • the maximum friction coefficient at the engaging point at 0.7 rpm was measured as the static friction coefficient ( ⁇ s).
  • the ⁇ d was likewise adopted as for ⁇ d.
  • Disk Paper disk for automatic transmission (1 disk) Plate Steel plate for automatic transmission (1 plate) Surface pressure 10 kg/cm 2 Lubricant temp. 40°C, 100°C
  • the rotating speed was intermittently varied in a range of from 1 to 100 rpm.
  • the rotating speed was varied to determine the friction coefficient ( ⁇ ) versus the slip velocity (v), and when d ⁇ /dv ⁇ 0, the vibration was prevented and judgement was good.
  • the friction coefficient at the rotation speed of 1 rpm was defined as ⁇ 1 and the friction coefficient at 50 rpm was defined as ⁇ 50.
  • the ⁇ 1/ ⁇ 50 ratio was employed as the index.
  • the lubricant satisfying ⁇ l/ ⁇ 50 ⁇ 1 was concluded as having a preferred ability of preventing vibration.
  • ⁇ l/ ⁇ 50 ⁇ 1 is easily achieved in the vicinity of a practical working temperature range of from 80°C to 120°C, the reduction in the absolute value of ⁇ 1 disadvantageously causes the slipping of the clutch.
  • the value of ⁇ generally shows the temperature dependence and becomes smaller as the temperature is elevated, and a lubricant free of the temperature dependence is demanded.
  • the test was conducted at 165.5°C for 120 hours in accordance with the oxidation stability test of a lubricant for an internal combustion engine (JIS K-2514).
  • the amount of copper eluted after the processing at 150°C for 16 hours in accordance with JIS K-2513 was measured and the evaluation was made for judging the corrosion thereafter.
  • Samples each having the following composition were prepared by further adding thereto, in addition to the additives set forth below and additives described in respective tables, a paraffin-based mineral oil having a kinematic viscosity of 4 ⁇ 2x10 -6 m 2 /s (4.2 cSt) at 100°C as the rest to make up 100 wt% in total, in which the phosphorus was added so that the molar amounts of the phosphorus in the compositions became equal, and the above-described evaluation was conducted.
  • Table 1 and Table 2 In Tables, the overall characteristics as a lubricant composition are expressed by as excellent, O as good, ⁇ as acceptable, and ⁇ as unacceptable.
  • Lubricant Composition wt%) Polybutenyl succinimide (HiTEC 644: produced by Ethyl Petroleum Additives Inc.) 4.0 Phenol-based antioxidant (HiTEC 4728: produced by Ethyl Petroleum Additives Inc.) 0.5 N-Hydroxyethyl oleylimidazoline 0.02 Hydroxyethyl long-chained amine (Ethomeen T-12: produced by Akzo Chem.
  • orthophosphorous acid was used as an inorganic phosphorus compound and monolauryl glyceride as a polyol.
  • Example 1 As is apparent from comparison of Example 1 with Comparative Examples 1, 3 and 5, the samples containing the inorganic phosphorus compound show high ⁇ d and ⁇ s, the lowest ⁇ 0/ ⁇ d ratio, and low ⁇ s and ⁇ d indicating the aging change of the friction coefficient, revealing to be best. Other samples show high ⁇ 0/ ⁇ d ratio and also high ⁇ s and ⁇ d, revealing to be bad.
  • Lubricant compositions were prepared in the same manner as the lubricant compositions in Example 1 and Comparative Examples 1 to 6, except for adding 0.1 wt% of boric acid.
  • Example 2 As is apparent from comparison between Example 2 and Comparative Examples 7 to 10, when the inorganic phosphorus compound and monolauryl glyceride are present together as in Example 2, the samples satisfying both the frictional properties in SAE No. 2 test and the durability and temperature dependence in LVFA test are obtained.
  • Lubricant compositions were prepared in the same manner as the lubricant compositions in Example 2 and Comparative Examples 7 to 10 above, except for changing the friction modifier to the polyol compound variously.
  • the composition of each lubricant composition is shown in Table 5, and the results are shown in Tables 5 and 6.
  • the samples containing an inorganic phosphorus compound of the present invention and 2,4-hexanediol, 2,4-octanediol, monobutyl glyceride, monolauryl glyceride, or dioleylpentaerythritol ester show a low ⁇ 0/ ⁇ d ratio, while maintaining a high ⁇ s.
  • the ⁇ l/ ⁇ 50 ratio in LVFA of the lubricant used in the SAE NO. 2 friction test is low and no temperature dependence appears.
  • the lubricant composition used in the present invention exhibits excellent frictional properties in a wet clutch and a wet brake, in particular, provides a high ⁇ d (dynamic friction coefficient) and a high ⁇ s (static friction coefficient), shows good prevention of vibration in a lock-up clutch used for an automatic transmission, is imparted with good durability for preventing the vibration, thus showing excellent properties as a lubricant composition for a wet clutch or a wet brake, further, has friction coefficients free from the temperature dependence, and works sufficiently effectively as a shock absorber oil, a power steering oil, a hydraulic suspension oil, etc.

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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)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)

Claims (9)

  1. Utilisation d'un composé de phosphore inorganique qui peut contenir des atomes de soufre et/ou des atomes d'oxygène comme éléments constitutifs, ou d'un de ses sels d'amines, pour augmenter le coefficient de frottement statique (µs) à une valeur égale ou supérieure à 0,122 et réduire le rapport du coefficient de frottement au démarrage (µo) au coefficient de frottement dynamique (µd), de telle sorte que µo/µd ≤ 1,1, mesurés à 120°C dans l'essai de frottement SAE n° 2 tel que décrit précédemment, de frottement d'une composition de lubrifiant pour embrayage à bain d'huile ou frein à bain d'huile, comprenant au moins un polyol organique ayant au moins deux groupes hydroxyle dans la molécule.
  2. Utilisation suivant la revendication 1, dans laquelle la composition de lubrifiant comprend une huile de base qui consiste en au moins une huile minérale et/ou au moins une huile lubrifiante synthétique choisie entre des poly-α-oléfines, des copolymères éthylène-α-oléfine de bas poids moléculaire, des polybutènes, des esters de diacides, des polyglycols, des esters à encombrement stérique, des alkylbenzènes et des polyéthers.
  3. Utilisation suivant la revendication 1, dans laquelle le ou les polyols contenant au moins deux groupes hydroxyle dans la molécule est/sont présent(s) en une quantité de 0,01 % en poids à 4 % en poids.
  4. Utilisation suivant l'une quelconque des revendications précédentes, dans laquelle la composition de lubrifiant contient un dispersant sans cendre contenant des atomes d'azote.
  5. Utilisation suivant l'une quelconque des revendications 2 à 4, dans laquelle l'huile de base a une viscosité cinématique comprise dans l'intervalle de 1 x 10-6 à 8 x 10-5 m2/s (1 à 80 cst (centistokes)) à 100°C.
  6. Utilisation suivant l'une quelconque des revendications précédentes, dans laquelle le composé de phosphore inorganique est choisi entre l'acide phosphoreux, l'acide phosphorique, l'acide hypophosphorique, le trioxyde de phosphore, le tétroxyde de phosphore, l'anhydride phosphorique, l'acide phosphoro-tétrathionique (H3PS4), l'acide phosphoromonothionique (H3PO3S), l'acide phosphorodithionique (H3PO2S2) l'acide phosphorotrithionique (H3PO2S3) et le pentasulfure de phosphore (P2S5).
  7. Utilisation suivant l'une quelconque des revendications précédentes, dans laquelle le sel d'amine d'un composé de phosphore inorganique est utilisé.
  8. Utilisation suivant l'une quelconque des revendications précédentes, dans laquelle la composition de lubrifiant comprend en outre au moins un additif choisi entre des anti-oxydants, des dispersants-détergents, des agents extrême-pression, des modificateurs de frottement, des agents améliorant l'onctuosité, des agents anti-usure, des inhibiteurs de corrosion, des additifs anti-rouille, des agents de gonflement des caoutchoucs, des agents anti-mousse, des agents abaissant le point d'écoulement et des agents améliorant l'indice de viscosité.
  9. Utilisation suivant l'une quelconque des revendications précédentes, dans laquelle la quantité de composé de phosphore inorganique est comprise dans l'intervalle de 0,005 % en poids à 0,1 % en poids en termes de la quantité molaire de phosphore, sur la base de la composition totale.
EP94908130A 1992-08-18 1993-08-18 Utilisation de composes phosphoriques inorganiques pour ameliorer les proprietes frictionnelles de lubrifiants pour embrayages ou freins a disque humide une huile lubrifiante pour embrayages ou freins a disque humide Expired - Lifetime EP0622444B2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP21920092 1992-08-18
JP21920092 1992-08-18
JP219200/92 1992-08-18
PCT/JP1993/001155 WO1994004637A1 (fr) 1992-08-18 1993-08-18 Huile lubrifiante pour embrayages ou freins a disque humide

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EP0622444A1 EP0622444A1 (fr) 1994-11-02
EP0622444A4 EP0622444A4 (fr) 1995-02-15
EP0622444B1 EP0622444B1 (fr) 1999-12-29
EP0622444B2 true EP0622444B2 (fr) 2003-10-22

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EP (1) EP0622444B2 (fr)
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WO (1) WO1994004637A1 (fr)

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BR9509885A (pt) * 1994-12-09 1997-10-21 Exxon Chemical Patents Inc Aditivo solúvel em óleo composição de óleo lubrificante composição concentrada e processo para formar o aditivo
US5858929A (en) * 1995-06-09 1999-01-12 The Lubrizol Corporation Composition for providing anti-shudder friction durability performance for automatic transmissions
AU710294B2 (en) 1995-09-12 1999-09-16 Lubrizol Corporation, The Lubrication fluids for reduced air entrainment and improved gear protection
AU717747B2 (en) * 1995-10-18 2000-03-30 Lubrizol Corporation, The Antiwear enhancing composition for lubricants and functional fluids
CA2195702C (fr) * 1996-01-31 2005-11-22 Sumanth Addagarla Composition lubrifiante utile pour moteurs a deux temps, a injection directe et balayage carter
US5972851A (en) * 1997-11-26 1999-10-26 Ethyl Corporation Automatic transmission fluids having enhanced performance capabilities
US6225266B1 (en) * 1999-05-28 2001-05-01 Infineum Usa L.P. Zinc-free continuously variable transmission fluid
US6528458B1 (en) 2002-04-19 2003-03-04 The Lubrizol Corporation Lubricant for dual clutch transmission
EP1507841B1 (fr) * 2002-05-09 2013-03-27 The Lubrizol Corporation Fluides de transmission variable continue comprenant une combinaison de detergents surbasiques contenant du calcium et du magnesium
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JP5441480B2 (ja) * 2009-04-10 2014-03-12 昭和シェル石油株式会社 潤滑油組成物
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WO1994004637A1 (fr) 1994-03-03
DE69327453T2 (de) 2000-05-11
DE69327453T3 (de) 2004-07-01
EP0622444A4 (fr) 1995-02-15
DE69327453D1 (de) 2000-02-03
EP0622444A1 (fr) 1994-11-02
EP0622444B1 (fr) 1999-12-29

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