EP0885949A1 - Grease composition for maintenance-free articulated transmission shaft - Google Patents

Grease composition for maintenance-free articulated transmission shaft Download PDF

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Publication number
EP0885949A1
EP0885949A1 EP98109053A EP98109053A EP0885949A1 EP 0885949 A1 EP0885949 A1 EP 0885949A1 EP 98109053 A EP98109053 A EP 98109053A EP 98109053 A EP98109053 A EP 98109053A EP 0885949 A1 EP0885949 A1 EP 0885949A1
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EP
European Patent Office
Prior art keywords
weight
percent
lubricant
lubricant according
amount
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.)
Granted
Application number
EP98109053A
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German (de)
French (fr)
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EP0885949B1 (en
Inventor
Wilfried Dr. Rer. Nat. Dipl.-Chem. Dresel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuchs Europe Schmierstoffe GmbH and Co KG
Spicer Gelenkwellenbau GmbH
Original Assignee
GKN Gelenkwellenbau GmbH
Fuchs Dea Schmierstoffe GmbH and Co KG
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Priority claimed from DE19817055A external-priority patent/DE19817055A1/en
Application filed by GKN Gelenkwellenbau GmbH, Fuchs Dea Schmierstoffe GmbH and Co KG filed Critical GKN Gelenkwellenbau GmbH
Publication of EP0885949A1 publication Critical patent/EP0885949A1/en
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Publication of EP0885949B1 publication Critical patent/EP0885949B1/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • 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
    • C10N2010/02—Groups 1 or 11
    • 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
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    • 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
    • C10N2010/10—Groups 5 or 15
    • 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
    • C10N2010/12—Groups 6 or 16

Definitions

  • the invention relates to a lubricant for maintenance-free Cardan shafts.
  • German patent application 195 30 504 is already a grease known that even at high temperatures can be used in constant velocity joints with can be produced with little effort and as a permanent solid lubricant filling to an increased lifespan of constant velocity joints leads. It contains mineral and / or as a basis synthetic oils, urea compounds as thickeners and Molybdenum sulfide as a dispersed solid lubricant as well additionally graphite, polytetrafluoroethylene and at least one organic molybdenum compound.
  • organic phosphates in the lubricating oils described there Contain phosphines, phosphonates or phosphites that are suitable for the Improve the properties of the lubricant as a whole be viewed critically.
  • Such lubricants are characterized by a content of inorganic molybdenum disulfide and are suitable for homokinetic constant velocity joints, but do not give good when used in universal joint shafts Services.
  • a suitable basis for the lubricant according to the invention Mineral oils and / or synthetic hydrocarbon oils.
  • a naphthenic solvent raffinate which by a combination of naphthenic base mineral oil with one synthetic hydrocarbon oil in a ratio of 1: 3 until 1: 5 is obtained.
  • a paraffinic solvent refinate suitable which is a mixture of a paraffin base mineral oil with a synthetic hydrocarbon oil in a ratio of 1: 3 to 1: 5 and a viscosity of about 100 to 150 centistokes at 40 ° C.
  • the lubricant according to the invention contains a as a thickener Lithium soap obtained from a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms is derived.
  • a thickener Lithium soap obtained from a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms is derived.
  • complex lithium soaps made from a mixture various fatty acids and other acids.
  • the Sebacic acid or boric acid have thickeners for Lubricants have already found multiple uses because of them at higher temperatures than the simple lithium soaps can be used.
  • the lithium salts of aliphatic, cycloaliphatic or aromatic mono- or dicarboxylic acids and lithium borate have proven themselves particularly well as thickeners of lubricants.
  • the lithium salt is added to the base fat in an amount of 5 to 20 percent by weight based on the amount of base fat admitted.
  • control oils are olefin copolymers, Polybutenes, polyol esters, polyalfaolefins, perfluoropolyethers, Polysiloxanes and hydrogenated diene-styrene copolymers are suitable. They are generally added to the base fat in an amount of 2 up to 40 percent by weight based on the total amount of Lubricant added.
  • antioxidants sterically hindered phenols and Amines, for example phenyl- ⁇ -naphthylamine.
  • the correct properties of the lubricant according to the invention are also achieved by being next to others Additives dithiocarbamates or dithiophosphates of molybdenum, zinc or bismuth in combination with a thiadiazole contains. Molybdenum dithiophosphate and molybdenum dithiocarbamate have proven themselves particularly well. Such molybdenum compounds together with a 1-thia-3,4-diazole or his sulfur-bridged dimers are used, then the Lubrication properties both at high temperatures as well so strong with mechanical loads in the long term improved that the lubrication of the pin sets when Manufacturer for the entire service life of the commercial vehicle is sufficient.
  • an anti-corrosion agent such as N-acyl sarcosine and / or one High pressure additive such as methylene bis (dibutyl dithio carbamate) Lubricant clogged.
  • an anti-corrosion agent such as N-acyl sarcosine and / or one High pressure additive such as methylene bis (dibutyl dithio carbamate) Lubricant clogged.
  • the amount of added Additives in a quantity range from 2 to 10 Percent by weight, based on the total lubricant, lie.
  • the lubricant according to the invention is produced so that the by reacting lithium hydroxide with a aliphatic or aromatic mono- or dicarboxylic acid Alkylsulfonic acid or the boric acid lithium salts to be dissolved or suspended in the base and part of the Additives to the control oil is added. These two mixes are then at an elevated temperature between 80 to 240 ° C. a stirring or mixing device mixed together. High pressure homogenizers have been used to manufacture the Lubricant according to the invention with a uniform and particularly homogeneous distribution of its ingredients proven. The temperature sensitive additives are just before added to the homogenization.
  • This mixture is in the lubricant according to the invention in contain an amount of 53 percent by weight.
  • This mixture is in the lubricant according to the invention in contain an amount of 40 percent by weight.
  • This mixture is in the lubricant in an amount of 7 Weight percent included.
  • This mixture is in the lubricant according to the invention in an amount of 86 percent by weight.
  • This mixture is in the lubricant according to the invention in an amount of 7 percent by weight.
  • This mixture is in the lubricant according to the invention in an amount of 7 percent by weight.
  • Lubricants became the lubricant according to the recipe of Example 1 a lifetime failure test on universal joints subject. 8 universal joints with the invention Lubricant from example 1 and 6 universal joints with compared to a standard lubricant with the following composition:
  • This mixture is in a quantity in the standard lubricant of 86 percent by weight.
  • This component is 5 percent by weight in the standard lubricant contain.
  • the mixture of these additives is in your standard lubricant contained in an amount of 9 percent by weight.
  • the B10 value for the tested joints describes the determined service life at which 90% of the joints are not yet have failed.
  • the B63.2 value describes the same determined lifespan at which 36.8% of the universal joints still have not failed.
  • Fig. 1 shows the graphical representation of this experiment. It it can be seen that the running time when using the invention Lubricant is significantly higher than that of the Use of the standard lubricant, the failure-free Time must be added according to the table. This is in the Diagram listed again as t0 in the box at the bottom right.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)

Abstract

Grease for maintenance-free drive shafts contains: (a) naphthenic and/or paraffinic solvent raffinate(s) as base; (b) a Li salt of a 10-24 C hydroxy-fatty acid or a 2-12 C (cyclo)aliphatic dicarboxylic acid; (c) neutral oil(s); and (d) a Mo, Zn or Bi dithiocarbamate or dithiophosphate together with a thiadiazole and also antioxidants, corrosion inhibitors and high pressure additives normally used in lubricants.

Description

Gegenstand der Erfindung ist ein Schmierstoff für wartungsfreie Gelenkwellen.The invention relates to a lubricant for maintenance-free Cardan shafts.

Aus der deutschen Offenlegungsschrift 195 30 504 ist bereits ein Schmierfett bekannt, das auch bei hoher Temperaturbelastung in Gleichlaufgelenken angewendet werden kann, mit geringem Aufwand herstellbar ist und als permanente Festschmierstoffüllung zu einer erhöhten Lebensdauer von Gleichlaufgelenken führt. Es enthält als Basis mineralische und/oder synthetische Öle, Harnstoff-Verbindungen als Verdicker und Molybdänsulfid als dispergierten Festschmierstoff sowie zusätzlich Graphit, Polytetrafluorethylen und wenigstens eine molybdänorganische Verbindung. Weiterhin ist aus der internationalen Patentanmeldung WO 97/03152 die Verwendung von Molybdändisulfid, Zinknaphthenat und einem oder mehreren Metalldithiophosphaten als eine Reibung vermindernde Additivmischung in Schmierölen auf Basis eines mineralischen und/oder synthetischen Öles bekannt. Darüberhinaus ist aus der internationalen Patentanmeldung WO 94/11470 ein Lithiumseifen enthaltendes Schmierfett bekannt, dem Dithiocarbamate oder Dithiophosphate des Molybdäns im Gemisch mit Dithiocarbamaten oder Dithiophosphaten des Wismuts, des Bleis, des Antimons und anderer Schwermetalle bei gleichzeitiger Anwesenheit unterschiedlicher organischer Schwefelverbindungen, unter denen sich auch Thiadiazole befinden, zugesetzt sind. Außerdem sind in den dort beschriebenen Schmierölen organische Phosphate, Phosphine, Phosphonate oder Phosphite enthalten, die für die Verbesserung der Eigenschaften des Schmierstoffes als ganz entscheidend angesehen werden. Derartige Schmierstoffe sind durch einen Gehalt an anorganischem Molybdändisulfid gekennzeichnet und eignen sich für homokinetische Gleichlaufgelenke, geben aber beim Einsatz in Kreuzgelenkwellen keine guten Leistungen.From the German patent application 195 30 504 is already a grease known that even at high temperatures can be used in constant velocity joints with can be produced with little effort and as a permanent solid lubricant filling to an increased lifespan of constant velocity joints leads. It contains mineral and / or as a basis synthetic oils, urea compounds as thickeners and Molybdenum sulfide as a dispersed solid lubricant as well additionally graphite, polytetrafluoroethylene and at least one organic molybdenum compound. Furthermore, from the international Patent application WO 97/03152 the use of Molybdenum disulfide, zinc naphthenate and one or more Metal dithiophosphates as a friction reducing additive mixture in lubricating oils based on a mineral and / or known synthetic oils. Furthermore, from the international patent application WO 94/11470 a lithium soap containing grease known, the dithiocarbamate or Dithiophosphates of molybdenum mixed with dithiocarbamates or dithiophosphates of bismuth, lead, antimony and other heavy metals in the presence of different ones organic sulfur compounds, among which there are also thiadiazoles added. Also are organic phosphates in the lubricating oils described there, Contain phosphines, phosphonates or phosphites that are suitable for the Improve the properties of the lubricant as a whole be viewed critically. Such lubricants are characterized by a content of inorganic molybdenum disulfide and are suitable for homokinetic constant velocity joints, but do not give good when used in universal joint shafts Services.

Es besteht deshalb ein Bedarf bei der Entwicklung von wartungsfreien Kreuzgelenkwellen, insbesondere Kreuzgelenkgarnituren für schwere Nutzfahrzeuge durch eine Verbesserung der Eigenschaften von Schmierstoffen die Laufleistung, die Wirtschaftlichkeit und die Umweltverträglichkeit von Teilen der Nutzfahrzeuge Zu verbessern.There is therefore a need to develop maintenance-free universal joint shafts, especially universal joint sets for heavy commercial vehicles by improving the Properties of lubricants the mileage that Economy and environmental compatibility of parts of commercial vehicles to improve.

Erfindungsgemäß wird diese Aufgabe durch einen Schmierstoff gelöst, der

  • a) ein naphthenisches oder paraffinisches Solventraffinat einzeln oder im Gemisch als Basis,
  • b) ein Lithiumsalz einer Hydroxifettsäure mit 10 bis 24 Kohlenstoffatomen oder ein Lithiumsalz einer aliphatischen oder cycloaliphatischen Dicarbonsäure mit 2 bis 12 Kohlenstoffatomen,
  • c) ein oder mehrere Stellöle und
  • d) ein Molybdän-, Zink- oder Wismut-dithiocarbamat oder - dithiophosphat zusammen mit einem Thiadiazol
    • und weitere, in Schmierstoffen üblicherweise eingesetzte Oxida- tions-, Korrosions- und Hochdruckadditive enthält. According to the invention, this object is achieved by a lubricant which
  • a) a naphthenic or paraffinic solvent raffinate individually or in a mixture as a base,
  • b) a lithium salt of a hydroxy fatty acid with 10 to 24 carbon atoms or a lithium salt of an aliphatic or cycloaliphatic dicarboxylic acid with 2 to 12 carbon atoms,
  • c) one or more control oils and
  • d) a molybdenum, zinc or bismuth dithiocarbamate or dithiophosphate together with a thiadiazole
    • and contains further oxidation, corrosion and high pressure additives that are commonly used in lubricants.

    Für den erfindungsgemäßen Schmierstoff eignen sich als Basis Mineralöle und/oder synthetische Kohlenwasserstofföle. Bevorzugt wird ein naphthenisches Solventraffinat, das durch eine Kombination von Naphthenbasismineralöl mit einem synthetischen Kohlwasserstofföl in einem Verhältnis von 1:3 bis 1:5 erhalten wird. Ebenso ist ein paraffinisches Solventraffinat geeignet, das eine Mischung eines Paraffinbasismineralöls mit einem synthetischen Kohlenwasserstofföl in einem Verhältnis von 1:3 bis 1:5 ist und eine Viskosität von etwa 100 bis 150 Centistoke bei 40°C aufweist.A suitable basis for the lubricant according to the invention Mineral oils and / or synthetic hydrocarbon oils. Preferred is a naphthenic solvent raffinate, which by a combination of naphthenic base mineral oil with one synthetic hydrocarbon oil in a ratio of 1: 3 until 1: 5 is obtained. Also a paraffinic solvent refinate suitable, which is a mixture of a paraffin base mineral oil with a synthetic hydrocarbon oil in a ratio of 1: 3 to 1: 5 and a viscosity of about 100 to 150 centistokes at 40 ° C.

    Der erfindungsgemäße Schmierstoff enthält als Verdicker eine Lithiumseife, die von einer gesättigten oder ungesättigten, aliphatischen Mono- oder Dicarbonsäure mit 10 bis 24, vorzugsweise 16 bis 18 Kohlenstoffatomen abgeleitet ist. Zu bevorzugen sind komplexe Lithiumseifen, die aus einer Mischung verschiedener Fettsäuren und anderer Säuren gebildet werden. Vor allem Mischungen des Lithiumsalzes der 12-Hydroxstearinsäure mit den Lithiumsalzen der Azelainsäure, der Sebacinsäure oder der Borsäure haben als Verdickungsmittel für Schmierstoffe bereits vielfache Verwendung gefunden, weil sie bei höheren Temperaturen als die einfachen Lithiumseifen eingesetzt werden können.The lubricant according to the invention contains a as a thickener Lithium soap obtained from a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms is derived. To Preferred are complex lithium soaps made from a mixture various fatty acids and other acids. Especially mixtures of the lithium salt of 12-hydroxstearic acid with the lithium salts of azelaic acid, the Sebacic acid or boric acid have thickeners for Lubricants have already found multiple uses because of them at higher temperatures than the simple lithium soaps can be used.

    Auch die Lithiumsalze von aliphatischen, cycloaliphatischen oder aromatischen Mono- oder Dicarbonsäuren sowie Lithiumborat haben sich als Verdicker von Schmierstoffen besonders bewährt. Das Lithiumsalz wird dem Basisfett in einer Menge von 5 bis 20 Gewichtsprozent, bezogen auf die Menge des Basisfetts zugegeben.The lithium salts of aliphatic, cycloaliphatic or aromatic mono- or dicarboxylic acids and lithium borate have proven themselves particularly well as thickeners of lubricants. The lithium salt is added to the base fat in an amount of 5 to 20 percent by weight based on the amount of base fat admitted.

    Schließlich können für den erfindungsgemäßen Schmierstoff auch Amide von aromatischen Dicarbonsäuren, insbesondere die als Terephthalamate bezeichneten Amide der Terephthalsäure, vor allem das Octadecylamid der Terephthalsäure, mit gutem Erfolg eingesetzt werden.Finally, also for the lubricant according to the invention Amides of aromatic dicarboxylic acids, especially those as Terephthalamates called amides of terephthalic acid especially the octadecylamide of terephthalic acid, with good success be used.

    Zum Erreichen eines während des Betriebes möglichst flachen Viskositäts-Temperatur-Verlaufes werden dem Basisfett ein oder mehrere Stellöle zugegeben, in welchen die Additive bereits gelöst sein können. Als Stellöle sind Olefincopolymere, Polybutene, Polyolester, Polyalfaolefine, Perfluorpolyether, Polysiloxane und hydrierte Dien-Styrol-Copolymere geeignet. Sie werden dem Basisfett im allgemeinen in einer Menge von 2 bis 40 Gewichtsprozent, bezogen auf die Gesamtmenge des Schmierstoffes zugegeben.To achieve a flat as possible during operation The viscosity-temperature curve becomes one or more of the base fat added several control oils, in which the additives already can be solved. As control oils are olefin copolymers, Polybutenes, polyol esters, polyalfaolefins, perfluoropolyethers, Polysiloxanes and hydrogenated diene-styrene copolymers are suitable. They are generally added to the base fat in an amount of 2 up to 40 percent by weight based on the total amount of Lubricant added.

    Um den erfindungsgemäßen Schmierstoff gegen die hohen thermischen und mechanischen Beanspruchungen zu stabilisieren, die bei seiner Anwendung in der Lagerung des Zapfenkreuzes auftreten, müssen ihm Additive Zugesetzt werden. Als Antioxydantien eignen sich hierfür sterisch gehinderte Phenole und Amine, zum Beispiel Phenyl-α-naphthylamine.To the lubricant according to the invention against the high stabilize thermal and mechanical loads, which in its application in the bearing of the cross Additives must be added to it. As antioxidants sterically hindered phenols and Amines, for example phenyl-α-naphthylamine.

    Die richtigen Eigenschaften des erfindungsgemäßen Schmierstoffes werden zudem dadurch erreicht, daß er neben anderen Additiven Dithiocarbamate oder Dithiophosphate des Molybdäns, des Zinks oder des Wismuts in Kombination mit einem Thiadiazol enthält. Molybdän-dithiophosphate und Molybdändithiocarbamate haben sich ganz besonders bewährt. Werden derartige Molybdänverbindungen zusammen mit einem 1-Thia-3,4-diazol oder seinem schwefelverbrückten Dimeren eingesetzt, dann werden die Schmiereigenschaften sowohl bei hohen Temperaturen als auch bei mechanischen Belastungen auf dauerhafte Weise so stark verbessert, daß die Schmierung der Zapfengarnituren beim Hersteller für die ganze Lebensdauer des Nutzfahrzeuges ausreicht. The correct properties of the lubricant according to the invention are also achieved by being next to others Additives dithiocarbamates or dithiophosphates of molybdenum, zinc or bismuth in combination with a thiadiazole contains. Molybdenum dithiophosphate and molybdenum dithiocarbamate have proven themselves particularly well. Such molybdenum compounds together with a 1-thia-3,4-diazole or his sulfur-bridged dimers are used, then the Lubrication properties both at high temperatures as well so strong with mechanical loads in the long term improved that the lubrication of the pin sets when Manufacturer for the entire service life of the commercial vehicle is sufficient.

    Weitere Verbesserung lassen sich dadurch erreichen, daß man ein Korrosionsschutzmittel wie N-Acyl-Sarkosin und/oder einen Hochdruckzusatz wie Methylen-bis(dibutyl-dithio-carbamat) dem Schmierstoff zusetzt. Insgesamt soll die Menge der zuzusetzenden Additive in einem Mengenbereich von 2 bis 10 Gewichtsprozent, bezogen auf den gesamten Schmierstoff, liegen.Further improvement can be achieved in that an anti-corrosion agent such as N-acyl sarcosine and / or one High pressure additive such as methylene bis (dibutyl dithio carbamate) Lubricant clogged. Overall, the amount of added Additives in a quantity range from 2 to 10 Percent by weight, based on the total lubricant, lie.

    Die Herstellung des erfindungsgemäßen Schmierstoffes erfolgt so, daß die durch Umsetzung von Lithiumhydroxyd mit einer aliphatischen oder aromatischen Mono- oder Dicarbonsäure einer Alkylsulfonsäure oder der Borsäure hergestellten Lithiumsalze in der Basis gelöst oder suspendiert werden und ein Teil der Additive dem Stellöl zugegeben wird. Diese beiden Mischungen werden dann bei erhöhter Temperatur zwischen 80 bis 240°C in einer Rühr- oder Mischvorrichtung miteinander vermischt. Hochdruckhomogenisatoren haben sich für die Herstellung des erfindungsgemäßen Schmierstoffes mit einer gleichmäßigen und homogenen Verteilung seiner Inhaltsstoffe ganz besonders bewährt. Die temperaturempfindlichen Additive werden erst vor dem Homogenisieren zugegeben.The lubricant according to the invention is produced so that the by reacting lithium hydroxide with a aliphatic or aromatic mono- or dicarboxylic acid Alkylsulfonic acid or the boric acid lithium salts to be dissolved or suspended in the base and part of the Additives to the control oil is added. These two mixes are then at an elevated temperature between 80 to 240 ° C. a stirring or mixing device mixed together. High pressure homogenizers have been used to manufacture the Lubricant according to the invention with a uniform and particularly homogeneous distribution of its ingredients proven. The temperature sensitive additives are just before added to the homogenization.

    Die folgenden Beispiel zeigen Rezepturen des erfindungsgemäßen Schmierstoffes, die sich zur Lebensdauerschmierung von Zapfenkreuzlagerungen von Kreuzgelenken als hervorragend geeignet erwiesen haben: The following examples show formulations of the invention Lubricant that can be lubricated for life Pin cross bearings of universal joints as excellent have proven suitable:

    Beispiel 1example 1

    Es wurde ein erfindungsgemäßer Schmierstoff mit folgender allgemeiner Zusammensetzung hergestellt:There was a lubricant according to the invention with the following general composition:

    1. Basis1st base

    1,0 Gewichtsprozent1.0 percent by weight
    ArylcarbonsäureAryl carboxylic acid
    1,0 Gewichtsprozent1.0 percent by weight
    AlkylsulfonsäureAlkyl sulfonic acid
    3,0 Gewichtsprozent3.0 weight percent
    aliphatische Dicarbonsäuren mit 6 bis 10 C-Atomenaliphatic dicarboxylic acids with 6 up to 10 carbon atoms
    8,0 Gewichtsprozent8.0 percent by weight
    aliphatische Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre Glyceridealiphatic monocarboxylic acids with 12 up to 22 carbon atoms or their Glycerides
    3,0 Gewichtsprozent3.0 weight percent
    LithiumhydroxydLithium hydroxide
    43,0 Gewichtsprozent43.0 percent by weight
    naphthenisches Solventraffinatnaphthenic solvent refinate

    Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 53 Gewichtsprozent enthalten.This mixture is in the lubricant according to the invention in contain an amount of 53 percent by weight.

    Synthetische StellkomponentenSynthetic control components

    6,0 Gewichtsprozent6.0 percent by weight
    OlefincopolymeresOlefin copolymer
    18,0 Gewichtsprozent18.0 percent by weight
    PolyolesterPolyol ester
    76,0 Gewichtsprozent76.0 percent by weight
    Poly-α-OlefinePoly-α-olefins

    Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 40 Gewichtsprozent enthalten.This mixture is in the lubricant according to the invention in contain an amount of 40 percent by weight.

    AdditiveAdditives

    0,5 Gewichtsprozent0.5 percent by weight
    aminisches Antioxidansaminic antioxidant
    0,5 Gewichtsprozent0.5 percent by weight
    Carbonsäurealkanolamid Carboxylic acid alkanolamide
    2,0 Gewichtsprozent2.0 percent by weight
    MolybdänverbindungMolybdenum compound
    1,0 Gewichtsprozent1.0 percent by weight
    pflanzliches Ölvegetable oil
    1,0 Gewichtsprozent1.0 percent by weight
    SarkosinderivatSarcosine derivative
    2,0 Gewichtsprozent2.0 percent by weight
    ThiadiazolderivatThiadiazole derivative

    Diese Mischung ist in dem Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.This mixture is in the lubricant in an amount of 7 Weight percent included.

    Beispiel 2Example 2

    Es wurde ein weiterer erfindungsgemäßer Schmierstoff mit folgender allgemeiner Zusammensetzung hergestellt:Another lubricant according to the invention was used of the following general composition:

    1. Basis1st base

    2,0 Gewichtsprozent2.0 percent by weight
    BorsäureBoric acid
    14,0 Gewichtsprozent14.0 percent by weight
    Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre GlyzerideMonocarboxylic acids with 12 to 22 carbon atoms or their glycerides
    1,0 Gewichtsprozent1.0 percent by weight
    PolycarbonsäurePolycarboxylic acid
    3,0 Gewichtsprozent3.0 weight percent
    LithiumhydroxidLithium hydroxide
    66,0 Gewichtsprozent66.0 percent by weight
    paraffinisches Solventraffinatparaffinic solvent refinate

    Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 86 Gewichtsprozent enthalten.This mixture is in the lubricant according to the invention in an amount of 86 percent by weight.

    Synthetische StellkomponentenSynthetic control components

    12,0 Gewichtsprozent12.0 percent by weight
    OlefincopolymereOlefin copolymers
    36,0 Gewichtsprozent36.0 percent by weight
    PolyolesterPolyol ester
    52,0 Gewichtsprozent52.0 percent by weight
    Poly-α-olefinPoly-α-olefin

    Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.This mixture is in the lubricant according to the invention in an amount of 7 percent by weight.

    AdditiveAdditives

    0,5 Gewichtsprozent0.5 percent by weight
    aminisches Antioxidansaminic antioxidant
    0,5 Gewichtsprozent0.5 percent by weight
    CarbonsäurealkanolamidCarboxylic acid alkanolamide
    2,0 Gewichtsprozent2.0 percent by weight
    MolybdänverbindungMolybdenum compound
    1,0 Gewichtsprozent1.0 percent by weight
    pflanzliches Ölvegetable oil
    1,0 Gewichtsprozent1.0 percent by weight
    SarkosinderivatSarcosine derivative
    2,0 Gewichtsprozent2.0 percent by weight
    ThiadiazolderivatThiadiazole derivative

    Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.This mixture is in the lubricant according to the invention in an amount of 7 percent by weight.

    Beispiel 3Example 3

    Zur Beurteilung der Leistungsfähigkeit der erfindungsgemäßen Schmierstoffe wurde der Schmierstoff gemäß der Rezeptur von Beispiel 1 einem Lebensdauerausfalltest an Kreuzgelenken unterworfen. Dabei wurden 8 Kreuzgelenke mit dem erfindungsgemäßen Schmierstoff von Beispiel 1 und 6 Kreuzgelenke mit einem Standardschmierstoff folgender Zusammensetzung verglichen:To assess the performance of the invention Lubricants became the lubricant according to the recipe of Example 1 a lifetime failure test on universal joints subject. 8 universal joints with the invention Lubricant from example 1 and 6 universal joints with compared to a standard lubricant with the following composition:

    1. Basis1st base

    2,0 Gewichtsprozent2.0 percent by weight
    BorsäureBoric acid
    14,0 Gewichtsprozent14.0 percent by weight
    Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre GlyzerideMonocarboxylic acids with 12 to 22 carbon atoms or their glycerides
    1,0 Gewichtsprozent1.0 percent by weight
    PolycarbonsäurePolycarboxylic acid
    3,0 Gewichtsprozent3.0 weight percent
    LithiumhydroxidLithium hydroxide
    66,0 Gewichtsprozent66.0 percent by weight
    paraffinisches Solventraffinatparaffinic solvent refinate

    Diese Mischung ist in dem Standardschmierstoff in einer Menge von 86 Gewichtsprozent enthalten.This mixture is in a quantity in the standard lubricant of 86 percent by weight.

    Synthetische StellkomponentenSynthetic control components

    5,0 Gewichtsprozent5.0 percent by weight
    PolyolesterPolyol ester

    Diese Komponente ist zu 5 Gewichtsprozent in dem Standardschmierstoff enthalten.This component is 5 percent by weight in the standard lubricant contain.

    AdditiveAdditives

    0,5 Gewichtsprozent0.5 percent by weight
    aminisches Antioxidansaminic antioxidant
    0,7 Gewichtsprozent0.7 percent by weight
    CarbonsäurealkanolamidCarboxylic acid alkanolamide
    1,0 Gewichtsprozent1.0 percent by weight
    ImidazolinderivatImidazoline derivative
    1,0 Gewichtsprozent1.0 percent by weight
    pflanzliches Ölvegetable oil
    0,5 Gewichtsprozent0.5 percent by weight
    phenolisches Antioxidansphenolic antioxidant
    1,0 Gewichtsprozent1.0 percent by weight
    ThiadiazolderivatThiadiazole derivative
    2,5 Gewichtsprozent2.5 percent by weight
    ZinkdialkyldithiophosphatZinc dialkyl dithiophosphate
    1,5 Gewichtsprozent1.5 percent by weight
    ZinknaphthenatZinc naphthenate

    Die Mischung dieser Additive ist in dein Standardschmierstoff in einer Menge von 9 Gewichtsprozent enthalten.The mixture of these additives is in your standard lubricant contained in an amount of 9 percent by weight.

    Der vorstehend genannte Standardschmierstoff und der erfindungsgemäße Schmierstoff gemäß Beispiel 1 ergaben bei einer Auswertung der Lebensdauereinzelwerte mittels Weibull-Verteilung (VDA: Qualitätskontrolle der Automobilindustrie: Zuverlässigkeitssicherung bei Automobilherstellern und Lieferanten, Verfahren und Beispiele; Verband der Automobilindustrie e.V. (VDA), Westendstraße 61, Frankfurt am Main, 1976) eine deutlich verbesserte Lebensdauer beim Einsatz des erfindungsgemäßen Schmierstoffes. Die Kreuzgelenke wurden bei der Durchführung des Versuches einer Umgebungstemperatur von 80°C ausgesetzt. Als Ausfall wurde ein Überschreiten der Außentemperatur von 100°C, gemessen am Boden der Lagerbüchse der Zapfenkreuzgarnitur des Kreuzgelenkes, gewertet. Bei Verwendung des erfindungsgemäßen Schmierstoffes wurden deutlich höhere B10- und B63,2-Werte erzielt. Weibull-Verteilung erfindungsgemäßer Schmierstoff Standardschmierstoff Zahl der geprüften Gelenke 8 6 B10[h] 868 316 B63,2[h] 1.887 447 Korrelation 0,95 0,98 Ausfallfreie Zeit (h) 348 307 The above-mentioned standard lubricant and the lubricant according to the invention according to Example 1 resulted in an evaluation of the individual life values by means of Weibull distribution (VDA: quality control of the automotive industry: reliability assurance for automobile manufacturers and suppliers, processes and examples; Verband der Automobilindustrie eV (VDA), Westendstrasse 61, Frankfurt am Main, 1976) a significantly improved service life when using the lubricant according to the invention. The universal joints were exposed to an ambient temperature of 80 ° C when the test was carried out. The failure to exceed the outside temperature of 100 ° C, measured at the bottom of the bearing bush of the universal pin assembly of the universal joint, was rated. When using the lubricant according to the invention, significantly higher B10 and B63.2 values were achieved. Weibull distribution Lubricant according to the invention Standard lubricant Number of joints tested 8th 6 B10 [h] 868 316 B63.2 [h] 1,887 447 correlation 0.95 0.98 Failure free time (h) 348 307

    Hierbei beschreibt der B10-Wert für die geprüften Gelenke die ermittelte Lebensdauer, bei der 90% der Gelenke noch nicht ausgefallen sind. Analog beschreibt der B63,2-Wert die ermittelte Lebensdauer, bei der 36,8% der Kreuzgelenke noch nicht ausgefallen sind.The B10 value for the tested joints describes the determined service life at which 90% of the joints are not yet have failed. The B63.2 value describes the same determined lifespan at which 36.8% of the universal joints still have not failed.

    Fig. 1 zeigt die grafische Darstellung dieses Versuches. Es ist ersichtlich, daß die Laufzeit bei Verwendung des erfindungsgemäßen Schmierstoffes deutlich höher ist als bei der Verwendung des Standard-Schmierstoffes, wobei die ausfallfreie Zeit gemäß Tabelle hinzuaddiert werden muß. Diese ist in dem Diagramm als t0 im Kästchen unten rechts nochmals aufgeführt.Fig. 1 shows the graphical representation of this experiment. It it can be seen that the running time when using the invention Lubricant is significantly higher than that of the Use of the standard lubricant, the failure-free Time must be added according to the table. This is in the Diagram listed again as t0 in the box at the bottom right.

    Claims (6)

    Schmierstoff für wartungsfreie Gelenkwellen, dadurch gekennzeichnet, daß er a) ein naphthenisches oder paraffinisches Solventraffinat einzeln oder im Gemisch als Basis, b) ein Lithiumsalz einer Hydroxifettsäure mit 10 bis 24 Kohlenstoffatomen oder ein Lithiumsalz einer aliphatischen oder cycloaliphatischen Dicarbonsäure mit 2 bis 12 Kohlenstoffatomen, c) ein oder mehrere Stellöle und d) ein Molybdän-, Zink- oder Wismut-dithiocarbamat oder -dithiophosphat zusammen mit einem Thiadiazol und weitere, in Schmierstoffen üblicherweise eingesetzte Oxidations-, Korrosionsschutz- und Hochdruckadditive enthält.Lubricant for maintenance-free cardan shafts, characterized in that it a) a naphthenic or paraffinic solvent raffinate individually or in a mixture as a base, b) a lithium salt of a hydroxy fatty acid with 10 to 24 carbon atoms or a lithium salt of an aliphatic or cycloaliphatic dicarboxylic acid with 2 to 12 carbon atoms, c) one or more control oils and d) a molybdenum, zinc or bismuth dithiocarbamate or dithiophosphate together with a thiadiazole and contains further oxidation, corrosion protection and high pressure additives which are usually used in lubricants. Schmierstoff nach Anspruch 1, dadurch gekennzeichnet, daß er als Stellöl ein Olefincopolymeres, ein Polybuten, einen Polyolester, ein Polyalfaolefin, einen Perfluorpolyether oder ein Polysiloxan enthält.Lubricant according to claim 1, characterized in that it contains an olefin copolymer, a polybutene, a polyol ester, a polyalfaolefin, a perfluoropolyether or a polysiloxane as the adjusting oil. Schmierstoff nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß er das Stellöl in einer Menge von 2 bis 40 Gew.-%, bezogen auf die Gesamtmenge des Schmierstoffes, enthält. Lubricant according to claims 1 and 2, characterized in that it contains the control oil in an amount of 2 to 40% by weight, based on the total amount of the lubricant. Schmierstoff nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß er das Lithiumsalz in einer Menge von 5 bis 20 Gew.-% bezogen auf die Menge des Basisfetts, enthält.Lubricant according to Claims 1 to 3, characterized in that it contains the lithium salt in an amount of 5 to 20% by weight based on the amount of the base grease. Schmierstoff nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß er als weitere Additive aminische und/oder phenolische Antioxidantien enthält.Lubricant according to claims 1 to 4, characterized in that it contains aminic and / or phenolic antioxidants as further additives. Schmierstoff nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß er als weiteres Additiv N-Acyl-sarkosin als Korrosionsschutzmittel enthält.Lubricant according to claims 1 to 5, characterized in that it contains N-acyl sarcosine as a further additive as a corrosion protection agent.
    EP98109053A 1997-06-20 1998-05-19 Use of a grease composition for maintenance-free articulated transmission shaft Expired - Lifetime EP0885949B1 (en)

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    DE19726127 1997-06-20
    DE19726127 1997-06-20
    DE19817055 1998-04-17
    DE19817055A DE19817055A1 (en) 1997-06-20 1998-04-17 Lubricant for maintenance-free cardan shafts

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    EP0885949B1 EP0885949B1 (en) 2000-08-09

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    Also Published As

    Publication number Publication date
    ES2152724T3 (en) 2001-02-01
    US6541427B1 (en) 2003-04-01
    EP0885949B1 (en) 2000-08-09
    JPH1121579A (en) 1999-01-26

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