Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/06—Mixtures of thickeners and additives
• • 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
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • 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
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/10—Amides of carbonic or haloformic acids
  • C10M2215/102—Ureas; Semicarbazides; Allophanates
  • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
  • C10M2219/068—Thiocarbamate metal salts
• • 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
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • 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
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/02—Bearings
• • 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
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy

Definitions

• the present invention relates to a grease composition for use in an automobile wheel bearing.
• the bearings support the weight of the vehicle via tires and receive radial, thrust and moment loads, and impact loads from the tire contact point according to the running state of the vehicle. Used under severe load conditions (Non-Patent Document 1). Therefore, flaking due to metal fatigue is likely to occur. Conventionally, a method of increasing the thickness of the lubricating oil film (increasing the viscosity of the oil) has been used to extend the flaking life (fatigue life of the bearing material), but a grease composition that still has satisfactory performance has been used. I got it.
• the bearings may wear due to slight vibrations during transportation of the freight car, causing a phenomenon called fretting.
• fretting a phenomenon in order to reduce fretting, measures such as improving the lubricity by using grease with high oil film strength and good fluidity have been taken.
• a satisfactory grease composition has not yet been obtained.
• roller end face may be damaged due to the oil film running out. This damage is generally referred to as force squeezing on the roller end face.
• measures such as increasing the amount of oil and improving the extreme pressure of the lubricant have been taken.
• automobile wheel bearings have a single bearing (using two standard conforming bearings) depending on the structure, the first generation that combines two bearings, the second generation that incorporates part of the hub axle or knuckle into the bearing, It can be divided into the 3rd generation, which is built into the hub ring and the knuckle bearing, and the 4th generation, where the bearing inner ring and the constant velocity joint outer ring are integrated, but the problems described above are common to each generation. Is.
• Non-Patent Document 1 Japan Society for Automotive Engineers, Automotive Tribology, Yokendo, March 15, 1997, 270 pages
• an object of the present invention is to provide a grease composition for an automobile wheel bearing that extends the flaking life and lubrication life of the automobile wheel bearing and reduces fretting.
• the present invention provides an automotive wheel bearing grease containing (a) a urea-based thickening agent represented by the following general formula (1), (b) an organic molybdenum compound and (c) a base oil. Provide a composition.
• R and R may be the same or different from each other and each have 6 to 12 carbon atoms.
• R represents an aromatic hydrocarbon group having 6 to 15 carbon atoms
• the grease of the present invention can significantly extend flaking and lubrication life in automobile wheel bearings and reduce fretting. In particular, it is possible to run 1.2 million km for 10 years by controlling the roller end face force in the tapered roller bearing type.
• urea thickeners that can be used in the present invention are generally used as thickeners having excellent heat resistance and are represented by the following general formula:
• R and R may be the same or different from each other and each have 6 to 12 carbon atoms.
• An aromatic hydrocarbon group is shown. Specific examples include a phenyl group, a tolyl group, a xylyl group, a benzyl group, a t-butylphenol group, a benzyl group, and a mesityl group. Of these, The ru group is preferred.
• R represents an aromatic hydrocarbon group having 6 to 15 carbon atoms.
• R represents an aromatic hydrocarbon group having 6 to 15 carbon atoms.
• urea compounds that can be used include those represented by the following formulas (1-1) and (1-2). Of these, urea-based thickening agents represented by the formula (1-1) are particularly preferred.
• the content of the urea compound is not particularly limited, but is preferably 2 to 35 mass% with respect to the base oil.
• the urea type thickening agent of the present invention can be obtained, for example, by reacting monoamine with diisocyanate at 10 to 200 ° C., and the reaction method is not particularly limited and can be carried out by a known method.
• a volatile solvent may be used, but if a base oil is used as a solvent, it can be blended as it is in the composition of the present invention.
• diisocyanates that can be used include 2,4 tolylene diisocyanate, 2,6 tolylene diisocyanate, diphenylenomethane 4,4'-diisocyanate, naphthylene 1,5 diisocyanate, and the like.
• monoamines include aromatic amines such as aline, benzylamine, toluidine, and chloroarine.
• This urea thickener has a film-forming ability, so it has a long life (flaking) and flaking. The hitting can be improved.
• metal stone thickeners it does not promote the base oil's acidity, so that the acidity life (lubrication life) can be extended.
• the organomolybdenum compound that can be used in the present invention is a general term for organometallic load bearing additives whose metal group is molybdenum, and is generally widely used as an extreme pressure additive.
• molybdenum dithiocarbamate (MoDTC) molybdenum dithiocarbamate
• MoDTC molybdenum dithiophosphate
• R and R may be the same or different from each other, and each independently represents carbon.
• a linear or branched alkyl group having a number of 1 to 24, preferably 3 to 18, is represented, m is 0 to 3, n is 4 to 1, and m + n 4.
• compositions of the present invention is not limited in particular, the content of the organic molybdenum compound, and more preferably 0.1 to 10 mass 0/0, and even preferable instrument 1 to 5 mass 0/0.
• the base oil used in the present invention is generally used as a lubricating oil excellent in high temperature stability and low temperature fluidity.
• the base oil is preferably a mixed base oil containing 20-50 mass% synthetic oil and 80-50% mineral oil, which can be used regardless of mineral oil or synthetic oil.
• Synthetic oils that can be used in the present invention include, for example, poly ⁇ -olefin oil starting from 1 decene, co-oligomer oil of ⁇ -olefin and ethylene, ether ether synthetic oil, ester synthetic oil, polyglycol All known synthetic oils such as synthetic oils and silicone oils can be used.
• the synthetic oil is a hydrocarbon oil that is powered by carbon and hydrogen atoms.
• the grease composition of the present invention can contain an antioxidant, an antifungal agent, an anticorrosive agent and the like in addition to the above components.
• Preferable formulation examples of the composition of the present invention include the following:
• the urea type thickening agent represented by the above formula (G) or (1-2) is contained in an amount of 10 to 25% by mass based on the total mass of the yarn and the composition.
• MoDTC is contained in an amount of 1 to 5% by mass relative to the total mass of the composition
• composition comprising 60% mineral oil and 40% synthetic hydrocarbon oil, especially a mixed base oil of poly- ⁇ -olefin oil, as component (c).
• compositions containing an additive such as an anti-oxidation agent or an antifungal agent in an amount of 1 to 10% by mass relative to the total mass of the composition are particularly preferred.
• each component is added to the base oil simultaneously or sequentially and kneaded by a roll mill or the like. Can be manufactured. Alternatively, it can be prepared by preparing an additive composition having a concentration of 5 to 10 times the concentration of the final composition of the present invention and mixing the additive composition and the base oil.
• the grease yarns of Examples 1 to 4 and Comparative Examples 1 to 2 were prepared by adding the thickener and the organic molybdenum compound shown in Table 1 to the base oil shown in Table 1, and three roll mills. Kneaded and manufactured. The numerical value in a table
• surface shows content (%) in a composition.
• an aromatic urea compound represented by the above formula (1-1) was used as the thickeners of Examples 1 to 4 and Comparative Example 2, an aromatic urea compound represented by the above formula (1-1) was used.
• each composition was mixed with 3% by weight of an antioxidant and 2% by weight of an antifungal agent as optional components.
• the consistency of the dulle composition was measured according to IS K2220, and the consistency was all adjusted to 300.
• the flaking life in the turning life test of the taper roller bearing for large trucks was expressed as the life time.
• roller end face of the slewing life tester for the taper roller bearing for large trucks was observed, and the results were expressed in terms of the force of the roller end face and rough surface.
• the lubrication life of the deep groove ball bearing was taken as the result, and the result was expressed as the life time.
• Test conditions ASTM D 3336 compliant, test temperature 150 ° C,
• Test conditions ASTM D 4170 compliant, test bearing 5120 J, test time 2h
• the grease composition for automobile wheel bearings of the examples has improved flaking life and lubrication life and reduced fretting compared to the grease composition for automobile wheel bearings of the comparative examples. Reduced reduction of roller end face force of tapered roller bearings

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=36036402

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (14)

Citations (6)

Family Cites Families (7)

• 2004
  • 2004-09-07 JP JP2004260170A patent/JP4776193B2/ja not_active Expired - Lifetime
• 2005
  • 2005-09-07 EP EP05781950.0A patent/EP1801192B1/en not_active Expired - Lifetime
  • 2005-09-07 CN CN200580029689XA patent/CN101010419B/zh not_active Expired - Lifetime
  • 2005-09-07 WO PCT/JP2005/016401 patent/WO2006028121A1/ja not_active Ceased
• 2007
  • 2007-03-02 US US11/712,992 patent/US20070155634A1/en not_active Abandoned
• 2010
  • 2010-12-16 US US12/970,572 patent/US20110086785A1/en not_active Abandoned

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events