US20070173420A1 - Grease composition and rolling device - Google Patents

Grease composition and rolling device Download PDF

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Publication number
US20070173420A1
US20070173420A1 US10/590,238 US59023804A US2007173420A1 US 20070173420 A1 US20070173420 A1 US 20070173420A1 US 59023804 A US59023804 A US 59023804A US 2007173420 A1 US2007173420 A1 US 2007173420A1
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grease
weight
amount
grease composition
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Kenichi Iso
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NSK Ltd
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NSK Ltd
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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
    • 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
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/16—Naphthenic acids
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups 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
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—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
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • 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—Semi-solids; greasy

Definitions

  • the present invention relates to a grease composition particularly excellent in anti-flaking performance and anti-seizure performance in a wide temperature range of from a low temperature to a high temperature and having a low torque performance. Moreover, the invention relates to a rolling device such as a rolling bearing, a ball screw device, or a linear guide device into which such a grease composition is charged.
  • a rolling device such as a rolling bearing, a ball screw device, or a linear guide device into which such a grease composition is charged.
  • sulfonate salt excellent in antirust properties is frequently added to a grease composition (e.g., see Japanese Patent Unexamined Publication JP-A-7-179879).
  • the sulfonate salt has a problem that it promotes generation of hydrogen owing to degradation of a grease composition and is apt to induce flaking involving white texture change caused by the hydrogen (hereinafter referred to as “white texture flaking”).
  • the invention is conducted in consideration of the above circumstances and an object of the invention is to provide a grease composition particularly maintaining a low torque over a wide temperature range of from a low temperature to a high temperature and further suppressing generation of white texture flaking as well as a rolling device into which the above grease composition is charged and which works with a low torque, hardly induces white texture flaking, and is excellent in durability.
  • the present invention provides a grease composition
  • a grease composition comprising a base oil having a dynamic viscosity at 40° C. of 20 to 50 mm 2 /s; a urea compound as a thickening agent in an amount of 8 to 30% by weight with respect to total weight of the grease; at least one antirust additive selected from carboxylic acids, carboxylate salts, and ester-based antirust additives in an amount of 0.1 to 10% by weight per single additive with respect to total weight of the grease and in an amount of 0.1 to 15% by weight in total of the additive with respect to total weight of the grease, and a rolling device into which the above grease composition is charged.
  • FIG. 1 is a sectional view illustrating one embodiment of a rolling bearing which is one of the rolling devices of the invention
  • FIG. 2 is a graph illustrating the relationship between dynamic viscosity of a base oil and an flaking life ratio obtained in Examples
  • FIG. 3 is a graph illustrating the relationship between dynamic viscosity of a base oil and dynamic torque obtained in Examples
  • FIG. 4 is a graph illustrating the relationship between dynamic viscosity of a base oil and a seizure life ratio obtained in Examples
  • FIG. 5 is a schematic block diagram illustrating a test apparatus for use in measurement of flaking generation probability
  • FIG. 6 is a graph illustrating the relationship between an amount of zinc naphthenate added and flaking generation probability or a rust evaluation score obtained in Examples, and
  • FIG. 7 is a graph illustrating the relationship between an amount of an organometallic salt (ZnDTC) and flaking generation probability or seizure life time obtained in Examples.
  • Numeral 1 represents an inner ring
  • 2 represents an outer ring
  • 3 represents a ball
  • 4 represents a holder
  • 5 represents a sealing member in the figures.
  • the base oil for use in the grease composition is not particularly limited except that the dynamic viscosity at 40° C. is from 20 to 50 mm 2 /s.
  • the dynamic viscosity of the base oil at 40° C. is preferably from 25 to 50 mm 2 /s.
  • the base oil there may be mentioned mineral oil-, synthetic oil-, or natural oil-based lubricating oil and the like.
  • mineral oil-based lubricating oil use can be made of those obtained by purifying mineral oil by suitably combining distillation under reduced pressure, oil-deasphalting, solvent extraction, hydrogenolysis, solvent dewaxing, sulfuric acid washing, clay purification, hydrogenative purification, and the like.
  • synthetic oil-based lubricating oil there may be mentioned hydrocarbon oil, aromatic oil, ester-based oil, ether-based oil, and the like.
  • hydrocarbon oil there may be mentioned normal paraffins, isoparaffins, poly- ⁇ -olefins such as polybutene, polyisobutyrene, 1-decene oligomers, and cooligomers of 1-decene with ethylene, hydrogenated products thereof, and the like.
  • aromatic oil there may be mentioned alkylbenzenes such as monoalkylbenzenes and dialkylbenzenes, alkylnaphthalenes such as monoalkylnaphthalenes, dialkylnaphthalenes, and polyalkylnaphthalene, and the like.
  • ester-based oil there may be mentioned diester oil such as dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl glutamate, and methyl acetylcinolate, aromatic ester oil such as trioctyl trimellitate, tridecyl trimellitate, and tetraoctyl pyromellitate, further, polyol ester oil such as trimethylolpropane caprilate, trimethylolpropane pelargonate, pentaerythritol-2-ethylhexanoate, pentaerythritol pelargonate, furthermore, complex ester oil which are oligoesters of polyhydric alcohols with mixed fatty acids of dibasic acids and monobasic acids, and the like.
  • diester oil such as dibutyl se
  • ether-based oil there may be mentioned polyglycols such as polyethylene glycol, polypropylene glycol, polyethylene glycol monoethers, and polypropylene glycol monoethers, phenyl ether oil such as monoalkyl triphenyl ether, alkyl diphenyl ether, dialkyl diphenyl ether, pentaphenyl ether, tetraphenyl ether, monoalkyltetraphenyl ether, and dialkyltetraphenyl ether, and the like.
  • tricresyl phosphate silicone oil, perfluoroalkyl ethers, and the like.
  • oil-based lubricating base oil there may be mentioned oil-and-fat-based oil such as beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil and hydrogenation products thereof.
  • oil-and-fat-based oil such as beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil and hydrogenation products thereof.
  • ester-based synthetic oil, synthetic hydrocarbon oil, ether-based synthetic oil, and the like are preferred.
  • the lubricating oil mentioned above can be used singly or as a mixture obtained by suitably combining them and they are adjusted to a preferred dynamic viscosity as mentioned above.
  • any compound can be used without particular limitation as far as it is a urea compound
  • a mixture of diurea compounds represented by the following general formulae (1) to (3) is preferred.
  • the blending amount of the thickening agent is from 8 to 30% by weight with respect to total weight of the grease. When the amount is less than 8% by weight, the form as grease cannot be formed or maintained and when it exceeds 30% by weight, a low torque performance cannot be realized.
  • R 1 is a cyclohexyl group or an alkylcyclohexyl group having 7 to 12 carbon atoms
  • R 2 is a divalent aromatic ring-containing hydrocarbon group having 6 to 15 carbon atoms
  • R 3 is an alkyl group having 8 to 20 carbon atoms.
  • the above diurea compounds are mixed so that a ratio of [number of moles of R 1 /(number of moles of R 1 +number of moles of R 3 )] becomes from 0.1 to 1.0.
  • the ratio is preferably from 0.2 to 0.9.
  • At least one antirust additive selected from carboxylic acids, carboxylate salts, and ester-based antirust additives is blended into the grease composition.
  • These antirust additives do not promote generation of hydrogen involved in grease degenerative decomposition unlike sulfonate salts and can suppress the generation of white texture flaking.
  • the amount of the antirust additive to be added is from 0.1 to 10% by weight per single additive with respect to total weight of the grease. When the amount is less than 0.1% by weight, impartment of the antirust performance is insufficient and when the amount exceeds 10% by weight, grease is softened and grease leakage tends to occur. In view of sufficient impartment of the antirust performance and grease leakage, the amount to be added is preferably from 0.25 to 5% by weight. Furthermore, total amount of the antirust additives is from 0.1 to 15% by weight.
  • the naphthenate salts are not particularly limited as far as they are saturated carboxylate salts having a naphthene base.
  • saturated monocyclic carboxylate salts C n H 2n ⁇ 1 COOM
  • saturated polycyclic carboxylate salts C n H 2n ⁇ 3 COOM
  • aliphatic carboxylate salts C n H 2n+1 COOM
  • monocyclic carboxylate salts compounds represented by the following general formulae (4) and (5) can be exemplified:
  • R 4 represents a hydrocarbon group and specifically, an alkyl group, an alkenyl group, an aryl group, an alkaryl group, or an aralkyl group, or the like may be mentioned; and M represents a metal element and specifically Co, Mn, Zn, Al, Ca, Ba, Li, Mg, Cu, or the like. These naphthenate salts may be used singly or as a suitable combination thereof.
  • succinic acid derivate is also preferable.
  • succinic acid derivate succinic acid, alkylsuccinic acid, alkylsuccinic half ester, alkenylsuccinic acid, alkenylsuccinic half ester, succinic acid imido can be raised.
  • succinic acid derivates can be used singly or as a mixture obtained by suitably combining them.
  • organometallic salts are additives effective for improving flaking performance.
  • dialkyl dithiocarbamic acid(DTC)-based compounds shown in the following general formula (6) and dialkyl dithiophosphoric acid(DTP)-based compounds shown in the following general formula (7) can be suitably used:
  • M represents a metal species and specifically Sb, Bi, Sn, Ni, Te, Se, Fe, Cu, Mo, or Zn is used;
  • R 5 and R 6 may be the same or different from each other and each represents an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group, an alkylaryl group, or an arylalkyl group.
  • Particularly preferred groups include a 1,1,3,3-tetramethylbutyl group, a 1,1,3,3-tetramethylhexyl group, a 1,1,3-trimethylhexyl group, a 1,3-dimethylbutyl group, 1-methylundecane group, a 1-methylhexyl group, a 1-methylpentyl group, a 2-ethylbutyl group, a 2-ethylhexyl group, a 2-methylcyclohexyl group, a 3-heptyl group, a 4-methylcyclohexyl group, an n-butyl group, an isobutyl group, an isopropyl group, an isoheptyl group, an isopentyl group, an undecyl group, an eicosyl group, an ethyl group, an octadecyl group, an octyl group, a cyclooctyl group, a cyclo
  • ashless dithiocarbamates such as methylene-bis-alkyl dithiocarbamate represented by the following general formula (8):
  • R 7 and R 8 each represents a hydrocarbon group having 1 to 18 carbon atoms and R 7 and R 8 may be the same or different from each other.
  • the above organometallic salts may be used singly or as a combination of two or more thereof. In this connection, no limitation exists for the combination. Moreover, the organometallic salt is added in an amount of 0.1 to 10% by weight with respect to total weight of the grease in the case that it is used singly.
  • the organometallic salt has an action of forming a reaction film in minute spaces to suppress the white texture flaking but this action is not sufficiently exhibited when the amount added is less than 0.1% by weight. On the other hand, when the amount added exceeds 10% by weight, there is a possibility of deteriorating seizure performance through induction of excessive reaction between the organometallic salts. Furthermore, the organometallic salt is expensive and hence the case is not preferred also economically.
  • the amount of each organometallic salt is from 0.1 to 10% by weight as in the case of single use but the total amount is preferably 15% by weight or less.
  • the amount added is more than 15% by weight, blending ratios of the base oil, the thickening agent, and the antirust additive relatively decrease and thus respective effects become insufficient.
  • the process for producing the grease composition is not particularly limited.
  • An antirust additive and furthermore, if necessary, various additives such as organometallic salts and ashless dithiocarbamate may be added to a grease composition obtained by reacting a thickening agent in the base oil and the whole may be thoroughly mixed and homogeneously dispersed. At the time when the treatment is conducted, heating is also effective.
  • consistency of the above grease composition is preferably NLGI (National Lubricating Grease Institute) No. 1 to 3.
  • the invention relates to a rolling device into which the above grease composition is charged.
  • the rolling device is not limited and a rolling bearing, a ball screw device, a linear guide device, and the like can be exemplified.
  • the constitution is not limited and it may be known one.
  • a rolling bearing a ball bearing shown in FIG. 1 can be exemplified.
  • the rolling bearing shown in the figure has a constitution wherein there are provided an outer ring 2 having an outer ring raceway 2 a on its inside surface, an inner ring 1 having an inner ring raceway 1 a on its outside surface, a plurality of rolling elements, balls 3 provided between the outer ring raceway 2 a and the inner ring raceway 1 a in a freely rollable manner, and a holder 4 which holds a plurality of the balls 3 in a freely rollable manner, the above grease composition G is charged into a space 6 between the outer ring raceway 2 a and the inner ring raceway 1 a , and a space between the inner ring 1 and the outer ring 2 is sealed by a sealing member 5 fixed to a seal groove 2 b of the outer ring 2 .
  • the amount of the grease composition to be charged is suitably selected according to the kind of rolling devices.
  • Test greases were prepared with formulations shown in Table 1. With regard to Examples 1 and 2 and Comparative Examples 2 to 6, a base oil mixed with a diisocyanate was reacted with the same base oil mixed with an amine and the whole was stirred under heating to obtain a semi-solid material, an antirust additive (zinc naphthenate, a succinate ester, barium sulfonate) and/or an organometallic salt (zinc dialkyldithiocarbamate: ZnDTC, zinc dialkyldithiophosphate: ZnDTP), which were already solved in the base oil, were added to the semi-solid material, and the whole was thoroughly stirred and, after gradual cooling, was passed through a roll mill to obtain a grease.
  • an antirust additive zinc naphthenate, a succinate ester, barium sulfonate
  • an organometallic salt zinc dialkyldithiocarbamate: ZnDTC, zinc dialkyldithiophosphate: Zn
  • test greases were charged in an amount of 2.3 g into a single row deep groove ball bearing fitted with a contact rubber seal having an inner diameter of 17 mm, an outer diameter of 47 mm, and a width of 14 mm to prepare a test bearing. Then, the test bearing was continuously rotated under conditions of an inner ring rotation speed of 10500 min ⁇ 1 , room temperature atmosphere, and a radial load of 1320 N. When flaking was induced on the running surface of the outer ring to generate vibration, the rotation was stopped and time passed until that time was measured. The test was repeated five times per each of the test greases and an average value was regarded as white flaking life. The results are shown in FIG. 2 , the results being shown as relative values to the white flaking life of the test grease of Comparative Example 2.
  • test greases were charged in an amount of 3.4 g into a single row deep groove ball bearing fitted with a non-contact rubber seal having an inner diameter of 25 mm, an outer diameter of 62 mm, and a width of 17 mm (see FIG. 1 ) to prepare a test bearing. Then, dynamic torque was measured when the test bearing was continuously rotated for 30 minutes under conditions of an inner ring rotation speed of 3600 min ⁇ 1 , a bearing temperature of 30° C., a radial load of 30 N, and an axial load of 60 N.
  • test greases were charged in an amount of 2.0 g into a single row deep groove ball bearing fitted with a non-contact rubber seal having an inner diameter of 25 mm, an outer diameter of 62 mm, and a width of 17 mm (see FIG. 1 ) to prepare a test bearing. Then, the test bearing was continuously rotated under conditions of an inner ring rotation speed of 10000 min ⁇ 1 , a bearing temperature of 120° C., and a radial load of 98 N. When the outer ring temperature reached 150° C. due to seizure, the rotation was stopped and time passed until that time was measured. The test was repeated four times per each of the test greases and an average value was regarded as seizure life. The results are shown in FIG. 4 , the results being shown as relative values to the seizure life of the test grease of Comparative Example 1.
  • seizure life increases as the dynamic viscosity of the base oil increases and the life is almost saturated in the range exceeding 50 mm 2 /s (40° C.). Moreover, when the dynamic viscosity of the base oil is less than 20 mm 2 /s (40° C.), an improving effect on the seizure life is hardly observed.
  • the test apparatus shown in the figure has a constitution that the inner ring of a test bearing 75 was fitted to an edge of a shaft 70 supported by one pair of supporting bearings 71 , 71 , furthermore its outer ring is fixed to a holder 72 , and rotation from a motor (not shown in the figure) is transmitted to the test bearing 75 .
  • the test was conducted under the same conditions as in the above (1) white flaking life test.
  • test grease was charged in an amount of 2.3 g into a single row deep groove ball bearing with a contact rubber seal having an inner diameter of 17 mm, an outer diameter of 47 mm, and a width of 14 mm to prepare a test bearing. After it was rotated at 1800 min ⁇ 1 for 1 minute, 0.5 mL of 0.5% by weight of saline was introduced into the bearing and then the bearing was rotated at 1800 min ⁇ 1 for another 1 minute. After the test bearing was allowed to stand under conditions of 52° C. and 100% RH for 48 hours, the test bearing was dismantled and a rusting state of each track surface of the inner and outer rings was observed. Evaluation was conducted according to the following standards and a score of 2 or less was regarded to be acceptable.
  • Results of the flaking generation probability and rust evaluation score are shown in FIG. 6 . It is found that the generation of the white texture flaking and the rust generation are both suppressed when the amount of zinc naphthenate added falls within the range of 0.1 to 10% by weight.
  • results of the flaking generation probability and rust evaluation score are shown in FIG. 7 and it is found that the white texture flaking generation is suppressed when the amount of zinc naphthenate added falls within the range of 0.1 to 10% by weight and the seizure life is also improved at the same time.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
US10/590,238 2004-02-23 2004-02-23 Grease composition and rolling device Abandoned US20070173420A1 (en)

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US20140142012A1 (en) * 2011-07-28 2014-05-22 Kyodo Yushi Co., Ltd. Grease composition for ev/hev driving motor bearing and ev/hev driving motor bearing
US20140193110A1 (en) * 2011-09-26 2014-07-10 Nsk Ltd Grease Composition and Wheel Supporting Rolling Bearing Unit Having Grease Composition Packed Therein
US20140254968A1 (en) * 2011-09-30 2014-09-11 Nsk Ltd. Grease composition for rolling bearing and rolling bearing
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US9012386B2 (en) 2010-02-26 2015-04-21 Kyodo Yushi Co., Ltd. Grease composition for hub unit bearing employing an angular contact ball bearing and hub unit bearing
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US9012386B2 (en) 2010-02-26 2015-04-21 Kyodo Yushi Co., Ltd. Grease composition for hub unit bearing employing an angular contact ball bearing and hub unit bearing
US9567545B2 (en) * 2011-07-28 2017-02-14 Nsk Ltd. Grease composition for EV/HEV driving motor bearing and EV/HEV driving motor bearing
US20140142012A1 (en) * 2011-07-28 2014-05-22 Kyodo Yushi Co., Ltd. Grease composition for ev/hev driving motor bearing and ev/hev driving motor bearing
US20140193110A1 (en) * 2011-09-26 2014-07-10 Nsk Ltd Grease Composition and Wheel Supporting Rolling Bearing Unit Having Grease Composition Packed Therein
US20140254968A1 (en) * 2011-09-30 2014-09-11 Nsk Ltd. Grease composition for rolling bearing and rolling bearing
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CN104212612A (zh) * 2013-05-31 2014-12-17 中国石油化工股份有限公司 一种环烷酸钙基六聚脲润滑脂及其制备方法
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US11390826B2 (en) 2016-03-11 2022-07-19 Denso Corporation Grease composition, machine component, and starter overrunning clutch
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CN1922295A (zh) 2007-02-28
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WO2005080536A1 (ja) 2005-09-01

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