EP0885949B1 - Verwendung einer Schmierfettzusammentsetzung für wartungsfreie Gelenkwellen - Google Patents

Verwendung einer Schmierfettzusammentsetzung für wartungsfreie Gelenkwellen Download PDF

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Publication number
EP0885949B1
EP0885949B1 EP98109053A EP98109053A EP0885949B1 EP 0885949 B1 EP0885949 B1 EP 0885949B1 EP 98109053 A EP98109053 A EP 98109053A EP 98109053 A EP98109053 A EP 98109053A EP 0885949 B1 EP0885949 B1 EP 0885949B1
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Prior art keywords
percent
weight
lubricant
mixture
molybdenum
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EP98109053A
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English (en)
French (fr)
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EP0885949A1 (de
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
Gwb Gelenkwellenbau & Co KG GmbH
Spicer Gelenkwellenbau GmbH
Fuchs Dea Schmierstoffe GmbH and Co KG
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Priority claimed from DE19817055A external-priority patent/DE19817055A1/de
Application filed by Gwb Gelenkwellenbau & Co KG GmbH, Spicer Gelenkwellenbau GmbH, Fuchs Dea Schmierstoffe GmbH and Co KG filed Critical Gwb Gelenkwellenbau & Co KG GmbH
Publication of EP0885949A1 publication Critical patent/EP0885949A1/de
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    • 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
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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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
    • 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
    • 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 the use of 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.
  • this object is achieved through the use of a lubricant solved according to claim 1.
  • a suitable basis for the lubricant Mineral oils and / or synthetic hydrocarbon oils 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.
  • 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 contains a complex as a thickener Lithium soap made from a mixture of a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms and other acids is formed.
  • a complex as a thickener Lithium soap made from a mixture of a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms and other acids is formed.
  • a complex as a thickener Lithium soap made from a mixture of a saturated or unsaturated, aliphatic mono- or dicarboxylic acid with 10 to 24, preferably 16 to 18 carbon atoms and other acids is formed.
  • 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.
  • the lithium salts of aliphatic, Mono- or dicarboxylic acids 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 right properties of the lubricant are also achieved by being next to others Additives dithiocarbamates or dithiophosphates of molybdenum, in combination with a thiadiazole derivative 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 is manufactured so that the by reacting lithium hydroxide with a aliphatic mono- or dicarboxylic acid, produced 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 with a uniform and particularly homogeneous distribution of its ingredients proven. The temperature sensitive additives are just before added to the homogenization.
  • a lubricant according to the invention with the following general composition was produced: 1st base 1.0 Percent by weight Aryl carboxylic acid 1.0 Percent by weight Alkyl sulfonic acid 3.0 Percent by weight aliphatic dicarboxylic acids with 6 to 10 carbon atoms 8.0 Percent by weight aliphatic monocarboxylic acids with 12 to 22 carbon atoms or their glycerides 3.0 Percent by weight Lithium hydroxide 43.0 Percent by weight naphthenic solvent refinate
  • This mixture is contained in the lubricant according to the invention in an amount of 53 percent by weight.
  • Synthetic control components 6.0 Percent by weight Olefin copolymer 18.0 Percent by weight Polyol ester 76.0 Percent by weight Poly- ⁇ -olefins
  • This mixture is contained in the lubricant according to the invention in an amount of 40 percent by weight.
  • Additives 0.5 Percent by weight aminic antioxidant 0.5 Percent by weight Carboxylic acid alkanolamide 2.0 Percent by weight Molybdenum compound 1.0 Percent by weight vegetable oil 1.0 Percent by weight Sarcosine derivative 2.0 Percent by weight Thiadiazole derivative
  • This mixture is in the lubricant in an amount of 7 Weight percent included.
  • a further lubricant according to the invention with the following general composition was produced: 1st base 2.0 Percent by weight Boric acid 14.0 Percent by weight Monocarboxylic acids with 12 to 22 carbon atoms or their glycerides 1.0 Percent by weight Polycarboxylic acid 3.0 Percent by weight Lithium hydroxide 66.0 Percent by weight paraffinic solvent refinate
  • This mixture is contained in the lubricant according to the invention in an amount of 86 percent by weight.
  • Synthetic control components 12.0 Percent by weight Olefin copolymers 36.0 Percent by weight Polyol ester 52.0 Percent by weight Poly- ⁇ -olefin
  • This mixture is contained in the lubricant according to the invention in an amount of 7 percent by weight.
  • Additives 0.5 Percent by weight aminic antioxidant 0.5 Percent by weight Carboxylic acid alkanolamide 2.0 Percent by weight Molybdenum compound 1.0 Percent by weight vegetable oil 1.0 Percent by weight Sarcosine derivative 2.0 Percent by weight Thiadiazole derivative
  • This mixture is in the lubricant according to the invention in an amount of 7 percent by weight.
  • Example 1 8 universal joints with the lubricant according to the invention from Example 1 and 6 universal joints with a standard lubricant of the following composition were compared: 1st base 2.0 Percent by weight Boric acid 14.0 Percent by weight Monocarboxylic acids with 12 to 22 carbon atoms or their glycerides 1.0 Percent by weight Polycarboxylic acid 3.0 Percent by weight Lithium hydroxide 66.0 Percent by weight paraffinic solvent refinate
  • the standard lubricant contains 5 percent by weight of this component.
  • Additives 0.5 Percent by weight aminic antioxidant 0.7 Percent by weight Carboxylic acid alkanolamide 1.0 Percent by weight Imidazoline derivative 1.0 Percent by weight vegetable oil 0.5 Percent by weight phenolic antioxidant 1.0 Percent by weight Thiadiazole derivative 2.5 Percent by weight Zinc dialkyl dithiophosphate 1.5 Percent by weight Zinc naphthenate
  • the mixture of these additives is in the 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 runtime when using the 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)

Description

Gegenstand der Erfindung ist die Verwendung einer Schmierstoffes für wartungsfreie Gelenkwellen.
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.
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.
Erfindungsgemäß wird diese Aufgabe durch die Verwendung einer Schmierstoffes nach Anspruch 1 gelöst.
Für den 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.
Der Schmierstoff enthält als Verdicker eine Komplexe Lithiumseife, die aus einer Mischung von einer gesättigten oder ungesättigten, aliphatischen Mono- oder Dicarbonsäure mit 10 bis 24, vorzugsweise 16 bis 18 Kohlenstoffatomen und anderer Säuren gebildet wird. 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.
Auch die Lithiumsalze von aliphatischen, Mono- oder Dicarbonsäuren 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.
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.
Um den 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.
Die richtigen Eigenschaften des Schmierstoffes werden zudem dadurch erreicht, daß er neben anderen Additiven Dithiocarbamate oder Dithiophosphate des Molybdäns, in Kombination mit einem Thiadiazol-Derivat 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.
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.
Die Herstellung des Schmierstoffes erfolgt so, daß die durch Umsetzung von Lithiumhydroxyd mit einer aliphatischen Mono- oder Dicarbonsäure, 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 Schmierstoffes mit einer gleichmäßigen und homogenen Verteilung seiner Inhaltsstoffe ganz besonders bewährt. Die temperaturempfindlichen Additive werden erst vor dem Homogenisieren zugegeben.
Die folgenden Beispiel zeigen Rezepturen des Schmierstoffes, die sich zur Lebensdauerschmierung von Zapfenkreuzlagerungen von Kreuzgelenken als hervorragend geeignet erwiesen haben:
Beispiel 1
Es wurde ein erfindungsgemäßer Schmierstoff mit folgender allgemeiner Zusammensetzung hergestellt:
1. Basis
1,0 Gewichtsprozent Arylcarbonsäure
1,0 Gewichtsprozent Alkylsulfonsäure
3,0 Gewichtsprozent aliphatische Dicarbonsäuren mit 6 bis 10 C-Atomen
8,0 Gewichtsprozent aliphatische Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre Glyceride
3,0 Gewichtsprozent Lithiumhydroxyd
43,0 Gewichtsprozent naphthenisches Solventraffinat
Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 53 Gewichtsprozent enthalten.
Synthetische Stellkomponenten
6,0 Gewichtsprozent Olefincopolymeres
18,0 Gewichtsprozent Polyolester
76,0 Gewichtsprozent Poly-α-Olefine
Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 40 Gewichtsprozent enthalten.
Additive
0,5 Gewichtsprozent aminisches Antioxidans
0,5 Gewichtsprozent Carbonsäurealkanolamid
2,0 Gewichtsprozent Molybdänverbindung
1,0 Gewichtsprozent pflanzliches Öl
1,0 Gewichtsprozent Sarkosinderivat
2,0 Gewichtsprozent Thiadiazolderivat
Diese Mischung ist in dem Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.
Beispiel 2
Es wurde ein weiterer erfindungsgemäßer Schmierstoff mit folgender allgemeiner Zusammensetzung hergestellt:
1. Basis
2,0 Gewichtsprozent Borsäure
14,0 Gewichtsprozent Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre Glyzeride
1,0 Gewichtsprozent Polycarbonsäure
3,0 Gewichtsprozent Lithiumhydroxid
66,0 Gewichtsprozent paraffinisches Solventraffinat
Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 86 Gewichtsprozent enthalten.
Synthetische Stellkomponenten
12,0 Gewichtsprozent Olefincopolymere
36,0 Gewichtsprozent Polyolester
52,0 Gewichtsprozent Poly-α-Olefin
Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.
Additive
0,5 Gewichtsprozent aminisches Antioxidans
0,5 Gewichtsprozent Carbonsäurealkanolamid
2,0 Gewichtsprozent Molybdänverbindung
1,0 Gewichtsprozent pflanzliches Öl
1,0 Gewichtsprozent Sarkosinderivat
2,0 Gewichtsprozent Thiadiazolderivat
Diese Mischung ist in dem erfindungsgemäßen Schmierstoff in einer Menge von 7 Gewichtsprozent enthalten.
Beispiel 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:
1. Basis
2,0 Gewichtsprozent Borsäure
14,0 Gewichtsprozent Monocarbonsäuren mit 12 bis 22 Kohlenstoffatomen oder ihre Glyzeride
1,0 Gewichtsprozent Polycarbonsäure
3,0 Gewichtsprozent Lithiumhydroxid
66,0 Gewichtsprozent paraffinisches Solventraffinat
Diese Mischung ist in dem Standardschmierstoff in einer Menge von 86 Gewichtsprozent enthalten.
Synthetische Stellkomponenten
5,0 Gewichtsprozent Polyolester
Diese Komponente ist zu 5 Gewichtsprozent in dem Standardschmierstoff enthalten.
Additive
0,5 Gewichtsprozent aminisches Antioxidans
0,7 Gewichtsprozent Carbonsäurealkanolamid
1,0 Gewichtsprozent Imidazolinderivat
1,0 Gewichtsprozent pflanzliches Öl
0,5 Gewichtsprozent phenolisches Antioxidans
1,0 Gewichtsprozent Thiadiazolderivat
2,5 Gewichtsprozent Zinkdialkyldithiophosphat
1,5 Gewichtsprozent Zinknaphthenat
Die Mischung dieser Additive ist in dem Standardschmierstoff in einer Menge von 9 Gewichtsprozent enthalten.
Der vorstehend genannte Standardschmierstoff und der 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 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 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
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.
Fig. 1 zeigt die grafische Darstellung dieses Versuches. Es ist ersichtlich, daß die Laufzeit bei Verwendung des 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.

Claims (3)

  1. Verwendung eines Schmierstoffes für wartungsfreie Kreuzgelenkwellen, dadurch gekennzeichnet, dass er
    a) ein naphthenisches oder paraffinisches Solventraffinat einzeln oder im Gemisch als Basisfett,
    b) 5-20 Gew.-%, bezogen auf die Menge des Basisfetts, von einer gesättigten oder ungesättigten, aliphatischen Mono- oder Dicarbonsäure mit 10 bis 24 Kohlenstoffatomen einer komplexe Lithiumseife, die aus einer Mischung und anderer Säuren gebildet wird,
    c) 2-40 Gew.-%, bezogen auf die Gesamtmenge des Schmierstoffes mehrerer Stellöle aus der Gruppe der Olefincopolymeren des Polybutenes, eines Polyolesters eines Polyalphaolefins eines Perfluorpolyethers, eines Polysiloxans oder eines hydrierten Dien-Styrol-Copolymeren.
    d) ein Molybdän-dithiocarbamat oder -dithio-phosphat zusammen mit einem Thiadiazol-Derivat
    und weitere, in Schmierstoffen üblicherweise eingesetzte Oxidations-, Korrosionsschutz- und Hochdruckadditive enthält.
  2. Verwendung eines Schmierstoffes nach den Anspruch 1, dadurch gekennzeichnet, dass er als weitere Additive aminische und/oder phenolische Antioxidantien enthält.
  3. Verwendung eines Schmierstoffes nach den Anspruch 1 bis 2, dadurch gekennzeichnet, dass er als weiteres Additiv N-Acylsarkosin als Korrosionsschutzmittel enthält.
EP98109053A 1997-06-20 1998-05-19 Verwendung einer Schmierfettzusammentsetzung für wartungsfreie Gelenkwellen Expired - Lifetime EP0885949B1 (de)

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DE19817055 1998-04-17

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GB0002524D0 (en) * 2000-02-04 2000-03-29 Castrol Ltd A process for producing organometallic dithio-compounds and the orgenometallic dithio-compounds produced therefrom
JP4238509B2 (ja) * 2002-02-27 2009-03-18 Ｎｏｋクリューバー株式会社 グリース組成物
EP1673422A4 (de) * 2003-10-10 2009-12-30 Vanderbilt Co R T Schmiermittel, enthaltend synthetisches estergrundöl, molybdänverbindungen und verbindungen auf thiadiazol-basis
US7763574B2 (en) * 2003-10-10 2010-07-27 R.T. Vanderbilt Company, Inc. Lubricating compositions containing synthetic ester base oil, molybdenum compounds and thiadiazole-based compounds
MX2010006510A (es) * 2007-12-14 2010-10-04 Vanderbilt Co R T Composicion aditiva para grasas de presion extrema (ep) con excelentes propiedades de corrosion y antidesgaste.
KR101080763B1 (ko) * 2009-09-21 2011-11-07 현대자동차주식회사 장수명 가솔린 엔진오일 조성물
KR101543039B1 (ko) * 2009-10-26 2015-08-10 현대자동차주식회사 임피던스 매칭법을 이용한 인버터 커패시터 모듈의 회로 구성방법
CN102703168A (zh) * 2012-06-20 2012-10-03 津滨东宝(天津)科技发展有限公司 一种极压抗磨添加剂组合物及其在润滑脂中的应用
WO2019133238A1 (en) 2017-12-29 2019-07-04 Exxonmobil Research And Engineering Company Grease compositions for low temperatures operation
CN110804480A (zh) * 2018-08-06 2020-02-18 南京三佳万向节制造有限公司 一种万向节用润滑剂

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