WO2006095809A1 - Composition de graisse et roulement scelle a la graisse - Google Patents

Composition de graisse et roulement scelle a la graisse Download PDF

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Publication number
WO2006095809A1
WO2006095809A1 PCT/JP2006/304581 JP2006304581W WO2006095809A1 WO 2006095809 A1 WO2006095809 A1 WO 2006095809A1 JP 2006304581 W JP2006304581 W JP 2006304581W WO 2006095809 A1 WO2006095809 A1 WO 2006095809A1
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WO
WIPO (PCT)
Prior art keywords
grease
rolling bearing
grease composition
oil
cold
Prior art date
Application number
PCT/JP2006/304581
Other languages
English (en)
Japanese (ja)
Inventor
Takayuki Kawamura
Original Assignee
Ntn Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of WO2006095809A1 publication Critical patent/WO2006095809A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • 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
    • 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
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers 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
    • C10M2207/28—Esters
    • C10M2207/2805—Esters 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
    • 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
    • C10N2030/08—Resistance to extreme temperature
    • 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
    • C10N2030/76—Reduction of noise, shudder, or vibrations
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • 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 enclosed in a rolling bearing incorporated in various industrial machines, vehicles, etc., and particularly used at high speed rotation in a wide range of temperatures up to high temperatures.
  • the present invention relates to a grease composition suitable for a bearing.
  • a rolling bearing incorporated in various industrial machines, vehicles and the like is filled with a grease composition in order to impart lubricity.
  • This grease composition is obtained by kneading a base oil and a thickening agent, and as the base oil, a synthetic lubricating oil such as mineral oil, ester oil, silicone oil, ether oil, or fluorine oil is used.
  • a synthetic lubricating oil such as mineral oil, ester oil, silicone oil, ether oil, or fluorine oil is used.
  • metal soap urea compounds such as lithium soap and fluorine resin are generally used.
  • rolling bearings tend to be used at high-speed rotation, and accordingly, grease compositions are required to have high temperature resistance.
  • the use of metal soap as a thickening agent promotes oxidation of the base oil at high temperatures and reduces the lubricating action.
  • a grease that has excellent durability at high temperatures and suppresses abnormal noise during cold, there are 8 or more ester groups on one side of 8 or more carbon atoms constituting the chain molecule of synthetic hydrocarbon oil and oil.
  • a grease is known in which a urea compound is added as a thickening agent to a base oil composed of a mixed oil with an ester synthetic oil arranged in the form of a dithiophosphate as an extreme pressure agent (Patent Literature). 1).
  • a grease composition in which a base oil consisting of poly a-olefin (hereinafter abbreviated as PAO) oil and ester oil is blended with an alicyclic diurea compound as a thickener and zinc dithiocarbamate is added as an additive.
  • PAO poly a-olefin
  • a bearing in which an object is enclosed, and a plurality of balls interposed between the inner ring constituting the bearing and the outer ring are brought into contact with the ball and at least one of the inner ring or the outer ring at two points.
  • a bearing for an automobile pulley to which a contact angle is imparted is known! / Squeal (see Patent Document 2).
  • Patent Document 1 Japanese Patent Laid-Open No. 9-208982
  • Patent Document 2 Japanese Patent Laid-Open No. 11-270566 Disclosure of the invention
  • the present invention has been made to address such problems, and can reliably prevent the occurrence of cold noise during cold weather, and has a high temperature durability and a grease composition and grease.
  • the purpose is to provide a sealed rolling bearing.
  • the grease composition of the present invention is a grease composition containing a base oil and a thickening agent, wherein the thickening agent contains a urea compound represented by the following formula (1).
  • R 1 and R 2 represent a monovalent aliphatic hydrocarbon group having 1 to 7 carbon atoms.
  • R and R may be the same or different.
  • R is a divalent aromatic compound having 6 to 12 carbon atoms.
  • the base oil contains an aliphatic hydrocarbon oil.
  • the above dull composition includes at least one compound selected from polymetatalylate and polyatalylate (hereinafter, abbreviated as poly (meth) acrylate) as an additive.
  • the grease composition includes dithiophosphate as an additive.
  • the grease-filled rolling bearing of the present invention is a rolling bearing comprising an inner ring and an outer ring, and rolling elements interposed between the inner ring and the outer ring, and a grease composition sealed around the rolling elements.
  • the grease composition is the above grease composition.
  • the grease-filled rolling bearing of the present invention is used in an electrical accessory for automobiles that rotatably supports a rotating shaft that is driven to rotate by engine output on a stationary member, and is a heat and cold resistant noise bearing. And
  • the above-mentioned automotive auxiliary equipment includes a fan coupling device, an alternator, an idler pulley, It is a tension pulley, an electromagnetic clutch, or a compressor.
  • the grease composition of the present invention is a grease composition containing a base oil and a thickening agent, and the thickening agent contains a urea compound represented by the above formula (1). Therefore, a decrease in viscosity at low temperatures can be suppressed. As a result, it exhibits good lubricity in a wide temperature range from low temperature to high temperature, can prevent the occurrence of cold noise immediately after starting at low temperature, and has excellent properties at high temperature durability for a long time. It becomes a grease composition that can be maintained, and it becomes a grease composition for enclosing a bearing that can extend the life of the bearing as much as possible.
  • a grease-filled rolling bearing according to the present invention is a bearing comprising an inner ring and an outer ring, and rolling elements interposed between the inner ring and the outer ring, and the above grease composition is sealed around the rolling elements.
  • the low-temperature force also exhibits good lubricity in a wide temperature range up to high temperature, can prevent the occurrence of cold noise immediately after starting at low temperature, and the force is also excellent in high temperature durability for a long time. It becomes a rolling bearing that can be maintained. As a result, the life of the rolling bearing can be extended as much as possible.
  • the grease-filled rolling bearing is a rolling bearing used in an electrical accessory for automobiles, it is possible to reliably prevent the generation of cold abnormal noise during cold weather while maintaining lubrication performance at high temperatures.
  • the inventors of the present invention have intensively studied for the purpose of providing a dull composition and a grease-filled rolling bearing capable of reliably preventing the occurrence of cold noise during cold weather.
  • the thickening agent used in the grease composition of the present invention is a urea compound and is represented by the following formula (1), preferably a urea having two urea bonds in the molecule. [Chemical 2]
  • R 1 and R 2 represent a monovalent aliphatic hydrocarbon group having 1 to 7 carbon atoms
  • R is a divalent aromatic hydrocarbon group having 6 to 12 carbon atoms
  • An example of a method for producing a urea compound is to obtain a diisocyanate compound by reacting an amine group equivalent of an amine compound.
  • R and R are linear or branched having 1 to 7 carbon atoms.
  • an n-butyl group may be mentioned.
  • R and R have less than 1 carbon, i.e.
  • the fibers of the thickening agent become large, and noise during cold is likely to occur.
  • the number of carbon atoms is 8 or more, the heat resistance is poor and the high-temperature life is shortened.
  • the degree of miscibility of the grease yarn composition that can be used in the present invention is the degree of miscibility measured by JIS K 2220, and is preferably in the range of 150 to 400. If it is less than 150, the lubrication performance at low temperatures deteriorates, and if it exceeds 400, the grease composition tends to leak, such being undesirable.
  • base oil that can be used in the present invention, mineral oil, synthetic oil, or a mixed oil usually used for grease can be used.
  • the mineral oil includes paraffinic mineral oil and naphthenic mineral oil
  • the synthetic oil includes ester oil, ether oil, synthetic hydrocarbon oil, and the like. These can be used alone or in any mixture.
  • ether oils include dialkyl phenol ether oils and alkyl triphenyls. -Luether oil, alkyl tetraether ether oil, etc.
  • ester oils include diester oils, polyol ester oils, and their complex ester oils and aromatic ester oils.
  • Synthetic hydrocarbon oil is a hydrocarbon compound with a compound power of carbon and hydrogen.
  • PAO oil copolymer of ⁇ -olefin and olefin, aliphatic hydrocarbon oil such as polybutene, alkylbenzene, alkylnaphthalene, polyphenylene And aromatic hydrocarbon oils such as synthetic naphthene.
  • the kinematic viscosity of the base oil at 40 ° C. is preferably 15 mm 2 / s to 200 mmVs.
  • the kinematic viscosity of the base oil is the kinematic viscosity measured according to JIS K 2283. In the present invention, it is preferable to mix two oils.
  • the PAO oil is usually ⁇ -olefin or a mixture of isomerized ⁇ -olefin oligomers or polymers.
  • olefins include 1-octaten, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1 pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1 nonade Sen, 1-eicosene, 1-docosene, 1-tetracosene and the like can be mentioned, and usually a mixture thereof is used.
  • the synthetic hydrocarbon oil suitable for the present invention has both the stability of the oil film at a low temperature and the durability at a high temperature when a urea type thickener and an extreme pressure agent described later are blended. It is an aliphatic hydrocarbon oil that can be produced.
  • cocoon oil a copolymer of ⁇ -olefin and olefin, and polybutene are preferable.
  • a structure in which hydrogen is added to a terminal double bond of an oligomer which is a low polymer of ⁇ -olefin is represented by the following formula (2).
  • ⁇ is an integer and may be an integer in a range in which the synthetic hydrocarbon oil retains the kinematic viscosity described later in consideration of lubrication performance and lubrication life at high temperature and high speed.
  • polybutene which is a kind of koji.
  • This polybutene also has a starting material strength mainly composed of isobutylene. It can be produced by polymerization using a catalyst such as aluminum. Polybutene may be used as it is or after hydrogenation.
  • R 1 and R 2 represent an aliphatic hydrocarbon group having 1 to 20 carbon atoms, and R 1 and R 2 are the same.
  • R preferably has 8 carbon atoms and R has 10 carbon atoms.
  • the grease composition of the present invention contains the above-described base oil and thickener as essential components, and further includes an extreme pressure agent, an antioxidant, an antifungal agent, a metal deactivator, an oily agent, and the like.
  • the conventional Dalis additive can be further added.
  • organometallic compounds include organic molybdenum compounds such as molybdenum dithiocarbamate and molybdenum dithiophosphate, organic zinc compounds such as zinc dithiocarbamate, zinc dithiophosphate and zinc phenate, and dithiopower.
  • Organic antimony compounds such as antimony rubamate and antimony dithiophosphate, organic selenium compounds such as selenium dithiocarbamate, organic bismuth compounds such as bismuth naphthenate and bismuth dithiocarnomate, iron dithiocarbarate and iron octylate Organic iron compounds such as copper dithiocarbamate and copper naphthenate, organic tin compounds such as lead naphthenate and tin dithiorubamate, and organic tin compounds such as tin maleate and dibutyltin sulfide Or alkali metal, alkaline earth metal organic sulfonate, Over DOO, Ho Suhoneto, gold, silver, titanium, an organometallic compound such as cadmium can also be used if necessary.
  • organic selenium compounds such as selenium dithiocarbamate
  • organic bismuth compounds such as bismuth naphthenate and bismuth dithiocarnomate
  • sulfur compounds sulfides such as dibenzyldisulfide or polysulfide compounds, sulfurized fats and oils, ashless strength rubamic acid compounds, thiourea compounds, or thiocarbonates are used. be able to.
  • phosphoric acid extreme pressure agents include phosphate esters such as trioctyl phosphate and tricresyl phosphate, acidic phosphate esters, and phosphorous acid.
  • Phosphate ester compounds such as acid esters and acidic phosphites can be used.
  • halogen-based extreme pressure agents such as chlorinated paraffin, or solids such as boron compounds such as molybdenum disulfide, tungsten disulfide, graphite, polytetrafluoroethylene, antimony sulfide, and boron nitride.
  • a lubricant can be used.
  • dithiorubamate compounds and dithiophosphate compounds can be suitably used.
  • Anti-oxidation agents can be used by appropriately selecting anti-aging agents, ozone deterioration inhibitors, and anti-oxidation agents added to rubber, plastics, lubricants, etc.
  • the following compounds can be used. That is, Phenol 1-naphthylamine, Phenol 2-naphthylamine, Diphenyl-p-Phenoldiamine, Dipyridylamine, Phenothiazine, N-Methylphenothiazine, N-ethylphenothiazine, 3,7-Dioctyl Amine compounds such as phenothiazine, ⁇ , ⁇ '-dioctyldiphenylamine, ⁇ , ⁇ '-diisopropyl mono- ⁇ phenylenediamine, ⁇ , ⁇ '-di sec butyl- ⁇ -phenylenediamine, and the like can be used.
  • a phenol-based anti-oxidation agent can be used.
  • phenolic acid retardants include 2, 6 di-tert-dibutylphenol, n-octadecyl-3- (3 ', 5'-di-tert-butyl-4-hydroxyphenol) propionate, tetrakis (methylene). 3— (3 ′, 5 ′ —di-tert-butyl 4-hydroxyphenol) propionate) methane, 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 4,4′-butylidenebis (3-methyl-6-t butylphenol).
  • the following compounds can be used.
  • Ammonium salts of organic sulfonic acids organic sulfonic acid salts such as zinc, alkali metals, alkaline earth metals, etc., organic carboxylates, phenates, phosphonates, alkyls or alkyls such as alkenyl succinic acid esters, Alkenyl succinic acid derivatives, partial esters of polyhydric alcohols such as sorbitan monooleate, hydroxy fatty acids such as oleoylsarcosine, 1 mercapto fatty acids such as mercaptostearic acid or metal salts thereof, stearic acid, etc.
  • Higher fatty acids higher alcohols such as isostearyl alcohol, higher alcohol Esters of higher fatty acids, 2,5 dimercapto 1,3,4-thiadiazole, thiazoles such as 2-mercaptothiadiazole, 2- (decyldithio) monobenzimidazole, imidazole compounds such as benzimidazole, or 2, 5 Bis (dodecyldithio) -disulfide compounds such as benzimidazole, phosphate esters such as tris-nolferphosphite, thiocarboxylic acid ester compounds such as dilauryl thiopropionate, etc. Can be used.
  • corrosion inhibitors such as nitrites, nitrates, chromates, phosphates, molybdates and tungstates that passivate the metal surface can also be used.
  • a triazole compound such as venestriazole or tolyltriazole can be used.
  • Oily agent [0024] Oily agent:
  • the oily agent for example, the following compounds can be used. That is, fatty acids such as oleic acid stearic acid, fatty acid alcohols such as oleyl alcohol, fatty acid esters such as polyoxyethylene stearic acid ester polyglyceryl oleic acid ester, phosphoric acid, tricresyl phosphate, lauric acid ester or polyoxy Phosphoric acid esters such as ethylene glycol ether phosphoric acid can be used.
  • fatty acids such as oleic acid stearic acid, fatty acid alcohols such as oleyl alcohol, fatty acid esters such as polyoxyethylene stearic acid ester polyglyceryl oleic acid ester, phosphoric acid, tricresyl phosphate, lauric acid ester or polyoxy Phosphoric acid esters such as ethylene glycol ether phosphoric acid
  • fatty acids such as oleic acid stearic acid, fatty acid alcohols such as o
  • Viscosity index improver [0025] Viscosity index improver:
  • the viscosity index improver examples include poly (meth) acrylate.
  • the poly (meth) atrelate is a polymer or copolymer of an acrylate monomer represented by an alkyl (meth) acrylate.
  • the alkyl (meth) acrylate refers to at least one monomer selected from alkyl methacrylate and alkyl acrylate.
  • alkyl group examples include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a Noel group, a decyl group, a dodecyl group, a tetradecyl group, and a hexadecyl group.
  • the grease composition of the present invention is preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener. If the blending ratio of the additive is less than 0.1 parts by weight, the effect of adding the additive is insufficient, and if it exceeds 20 parts by weight, the dully becomes soft and easily leaks.
  • the blending ratio of the base oil is preferably 50 to 95 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener. If the blending ratio of base oil is less than 50 parts by weight, the grease is hard and the lubricity at low temperatures is poor. If it exceeds 95 parts by weight, it will be soft and leaky.
  • the blending ratio of the thickener is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener. If it is less than 5 parts by weight, it becomes a low-viscosity liquid and easily leaks, making it difficult to seal the bearing. If it exceeds 50 parts by weight, it will solidify to a consistency of 100 or less, making it impractical as a grease for bearings.
  • FIG. Figure 1 is a cross-sectional view of a rolling bearing.
  • the grease-filled rolling bearing 1 has an inner ring 2 having an inner ring rolling surface 2a on the outer peripheral surface and an outer ring 3 having an outer ring rolling surface 3a on the inner peripheral surface, and is arranged concentrically, and the inner ring rolling surface 2a and the outer ring rolling surface.
  • a plurality of rolling elements 4 are arranged between 3a and 3a.
  • Sealers 6 that are fixed to the cage 5 that holds the plurality of rolling elements 4, the outer ring 3, and the like are provided in the axial end openings 8 a and 8 b of the inner ring 2 and the outer ring 3, respectively.
  • the grease composition 7 is sealed at least around the rolling element 4.
  • FIGS. Fig. 2 is a cross-sectional view of the fan coupling device.
  • the fan coupling device is provided with an oil chamber 11 in which a viscous fluid such as silicone oil is filled in a case 10 that supports a cooling fan 9 and a stirring chamber 12 in which a drive disk 18 is incorporated.
  • a port 14 is formed in the partition plate 13 provided between the 12 and the end of a spring 15 that opens and closes the port 14 is fixed to the partition plate 13.
  • a bimetal 16 is attached to the front surface of the case 10, and a piston 17 of a spring 15 is provided on the bimetal 16.
  • the bimetal 16 becomes flat when the temperature of the air that has passed through the radiator is below the set temperature, for example, 60 ° C, the piston 17 presses the spring 15, and the spring 15 closes the port 14. If the temperature of the air exceeds the set temperature, As shown in FIG. 3, the bimetal 16 is bent outward, the piston 17 releases the pressure of the spring 15, and the spring 15 is elastically deformed to open the port 14.
  • the fan 9 is equivalent to being connected if it is hot enough to be disconnected from the drive shaft 20.
  • the die-sealed rolling bearing 1 is used in a wide temperature range and a wide rotation range from low temperature to high temperature.
  • Figure 4 shows an example of an alternator for automotive electrical equipment.
  • Figure 4 is a cross-sectional view of the alternator.
  • the alternator includes a pair of frames 21 a and 21 b forming a stationary member housing, and a rotor rotating shaft 23 having a rotor 22 mounted thereon is rotatably supported by a pair of grease-filled rolling bearings 1.
  • a rotor coil 24 is attached to the rotor 22, and a stator coil 2 of 3 mm at a phase of 120 ° is provided to the stator 25 disposed on the outer periphery of the rotor 22. 6 is installed.
  • the rotor rotating shaft 23 is rotationally driven by a rotational torque transmitted by a belt (not shown) to a pulley 27 attached to the tip of the rotor rotating shaft 23.
  • Pulley 27 is attached to rotor rotating shaft 23 in a cantilevered state, and vibration is also generated as rotor rotating shaft 23 rotates at high speed.Grease-filled rolling bearing 1 that supports pulley 27 side is particularly difficult. Under load.
  • FIG. 5 shows an example of an idler pulley used as a belt tensioner for an auxiliary drive belt of an automobile.
  • FIG. 5 is a sectional view of the idler pulley.
  • This pulley includes a pulley body 28 made of a steel plate press and a grease-filled rolling bearing 1 which is a single row deep groove ball bearing fitted to the inner diameter of the pulley body 28.
  • the pulley body 28 includes an inner diameter cylindrical portion 28a, a flange portion 28b in which one end force of the inner diameter cylindrical portion 28a extends to the outer diameter side, an outer diameter cylindrical portion 28c extending in the axial direction from the flange portion 28b, and the other end of the inner diameter cylindrical portion 28a.
  • This is an annulus composed of a flange portion 28d extending from the inside to the inner diameter side.
  • the outer diameter 3 of the grease-sealed rolling bearing 1 is fitted to the inner diameter of the inner diameter cylindrical portion 28a, and the outer peripheral diameter of the outer diameter cylindrical portion 28c is provided with a pulley peripheral surface 28e that comes into contact with the belt driven by the engine. /! By bringing the pulley peripheral surface 28e into contact with the belt, the pulley functions as an idler.
  • Grease-filled rolling bearing 1 includes an outer ring 3 fitted to the inner diameter of the inner cylindrical portion 28a of the pulley body 28, an inner ring 2 fitted to a fixed shaft (not shown), and transfer surfaces 2a and 3a of the inner and outer rings 2 and 3. It is composed of a plurality of rolling elements 4 incorporated between them, a cage 5 that holds the rolling elements 4 at equal intervals around the circumference, and a pair of seal members 6 that seal the dolly, and the inner ring 2 and the outer ring 3 are each united. Is formed.
  • FIG. 6 is a sectional view of the electromagnetic clutch and the scroll compressor.
  • Grease-filled rolling bearing 1 built in pulley 31 is mounted on the nose portion 37 of the compressor 30 and its outer ring is always rotated by belt drive.
  • the clutch plate 36 fixed to the compressor rotating shaft 35 is attracted to the pulley 31 by the magnetic flux generated by the coil current and connected to drive the compressor rotating shaft 35.
  • the electromagnetic clutch transmits and shuts off torque between the engine and the compressor by the above operation. It has functions such as adjusting the compressor speed by selecting a single diameter, mitigating impact during compressor operation, and absorbing torque fluctuations during steady rotation.
  • the scroll-type compressor 30 has a pair of spiral parts, a movable scroll 32 and a fixed scroll 33, and the space force between the two scrolls moves from the outside to the center, reducing the volume and compressing the refrigerant. It has a structure.
  • the rotation speed of the compressor rotating shaft 35 is 10000 rpm or more, and the maximum is about 12000 rpm, and the ambient temperature may rise to about 180 ° C. Therefore, the dolly-enclosed rolling bearing 1 of the electromagnetic clutch 29 shown in FIG. 6 and other rolling bearings (not shown) in the compressor must have sufficient durability even under the use conditions.
  • a base oil, a thickener and an additive were blended in the proportions shown in Table 1 to obtain a grease composition.
  • the additive the blending amount with respect to a total of 100 parts by weight of the thickener and the base oil is shown in parts by weight.
  • the obtained grease composition was subjected to a measurement of the degree of mixing according to JIS K 2220, a cold abnormal noise measurement and a high temperature grease life test, and the results are also shown in Table 1. Test methods and test conditions are as follows.
  • Kikuloop Z1 1 2 manufactured by Asahi Denka Kogyo Co., Ltd.
  • the grease using the thickener represented by the formula (1) generates noise during cold. High temperature and long life. This is because the increase in viscosity of the grease composition during cold weather is prevented by the addition of the above-mentioned thickener, and the occurrence of oil film unevenness on the bearing raceway surface is suppressed, thereby increasing the effect of preventing cold noise. it is conceivable that. Therefore, it can be suitably used for a rolling bearing used in cold weather, particularly a rolling bearing for electrical equipment.
  • the grease composition of the present invention exhibits good lubricity in a wide temperature range from low temperature to high temperature, and can prevent the occurrence of cold abnormal noise immediately after starting at low temperature.
  • the bearing in which the gas composition is sealed can be suitably used for a bearing for a vehicle such as an automobile in cold weather.
  • FIG. 1 is a cross-sectional view of a rolling bearing.
  • FIG. 2 is a cross-sectional view of the fan coupling device.
  • FIG. 3 is a cross-sectional view of the fan coupling device.
  • FIG. 4 is a sectional view of an alternator.
  • FIG. 5 is a sectional view of an idler pulley.
  • FIG. 6 is a cross-sectional view of an electromagnetic clutch and a compressor.

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

Abstract

L’invention présente une composition de graisse et un roulement scellé à la graisse qui peut empêcher de manière fiable l’apparition de bruits anormaux à froid à basses températures et qui présente une résistance aux hautes températures. La composition de graisse comporte une huile de base et un agent épaississant. L’agent épaississant est caractérisé par le fait qu’il contient un composé d’urée représenté par la formule (1). (1) où R1 et R3, qui peuvent être semblables ou différents, représentent un groupe hydrocarbone monovalent aliphatique avec entre 1 et 7 atomes de carbone ; et R2 représente un groupe hydrocarbone divalent aromatique avec entre 6 et 12 atomes de carbone. Le roulement scellé à la graisse (1) comporte un anneau interne (2), un anneau externe (3), et un élément roulant (4) placé entre l’anneau interne (2) et l’anneau externe (3). La composition de graisse ci-dessus est scellée sur la périphérie de l’élément roulant (4). Le roulement scellé à la graisse (1) est utilisé dans un équipement auxiliaire électrique de véhicule.
PCT/JP2006/304581 2005-03-11 2006-03-09 Composition de graisse et roulement scelle a la graisse WO2006095809A1 (fr)

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JP2005068603A JP2006249271A (ja) 2005-03-11 2005-03-11 グリース組成物およびグリース封入転がり軸受
JP2005-068603 2005-03-11

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2009063830A1 (fr) * 2007-11-15 2009-05-22 Ntn Corporation Composition de graisse et palier à graisse scellée
WO2021075553A1 (fr) * 2019-10-16 2021-04-22 協同油脂株式会社 Composition de graisse pour partie réducteur de vitesse d'un composant électrique embarqué

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5797596B2 (ja) * 2011-04-21 2015-10-21 株式会社ジェイテクト 転がり軸受
JP5892822B2 (ja) * 2012-03-22 2016-03-23 株式会社ジェイテクト グリース組成物および転動装置
BR112015017754A2 (pt) * 2013-02-08 2017-07-11 Shell Int Research processo para preparar um lubrificante de ureia
JP2013173956A (ja) * 2013-06-10 2013-09-05 Ntn Corp グリース封入軸受

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JPH03128993A (ja) * 1989-07-07 1991-05-31 Nippon Oil Co Ltd ジウレアグリース組成物
JPH08113793A (ja) * 1994-10-17 1996-05-07 Nippon Seiko Kk グリース組成物
JPH093466A (ja) * 1995-06-22 1997-01-07 Nippon Seiko Kk 転がり軸受用グリース組成物
JPH11503771A (ja) * 1995-03-22 1999-03-30 エクソン リサーチ アンド エンジニアリング カンパニー 繊維状ポリウレアグリース
JP2004149620A (ja) * 2002-10-29 2004-05-27 Nsk Ltd グリース組成物及びグリース封入転がり軸受
JP2004359809A (ja) * 2003-06-04 2004-12-24 Nsk Ltd グリース組成物及び転がり軸受

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JPH03128993A (ja) * 1989-07-07 1991-05-31 Nippon Oil Co Ltd ジウレアグリース組成物
JPH08113793A (ja) * 1994-10-17 1996-05-07 Nippon Seiko Kk グリース組成物
JPH11503771A (ja) * 1995-03-22 1999-03-30 エクソン リサーチ アンド エンジニアリング カンパニー 繊維状ポリウレアグリース
JPH093466A (ja) * 1995-06-22 1997-01-07 Nippon Seiko Kk 転がり軸受用グリース組成物
JP2004149620A (ja) * 2002-10-29 2004-05-27 Nsk Ltd グリース組成物及びグリース封入転がり軸受
JP2004359809A (ja) * 2003-06-04 2004-12-24 Nsk Ltd グリース組成物及び転がり軸受

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009063830A1 (fr) * 2007-11-15 2009-05-22 Ntn Corporation Composition de graisse et palier à graisse scellée
JP2009120738A (ja) * 2007-11-15 2009-06-04 Ntn Corp グリース組成物および該グリース封入軸受
WO2021075553A1 (fr) * 2019-10-16 2021-04-22 協同油脂株式会社 Composition de graisse pour partie réducteur de vitesse d'un composant électrique embarqué
JP2021063183A (ja) * 2019-10-16 2021-04-22 協同油脂株式会社 車載電装品の減速機部用グリース組成物
JP7280800B2 (ja) 2019-10-16 2023-05-24 協同油脂株式会社 車載電装品の減速機部用グリース組成物
US12077721B2 (en) 2019-10-16 2024-09-03 Kyodo Yushi Co., Ltd. Grease composition for speed reducer part of on-vehicle electric component

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