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
  • C10M169/02—Mixtures of base-materials and thickeners
• • 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
  • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
  • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
• • 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
• • 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
  • 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/003—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions 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
  • 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
  • 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
  • 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
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • 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 and machine elements, and particularly, to a grease composition which is suitably used for rolling bearings and constant-velocity joints for automobile instruments or auxiliaries, and to a rolling bearing, or constant-velocity joints in which the grease composition is filled.
• the service life of lubrication units used for rolling and rolling-sliding is associated with fatigue, i.e. flaking. In order to prevent this flaking and prolong the service life, it is required to decrease the frequency of direct contact of both surfaces lubricating with each other. As a method of not contacting both the surfaces each other, a measure is generally taken to increase the viscosity of the lubricating oil, i.e. the base oil in the grease, and to thicken the oil layer.
• Such a property of the grease composition is strongly required when machine elements to be lubricated are constant-velocity joints, gears or rolling bearings for automobiles.
• a diurea grease in which the base oil mainly comprises a synthetic hydrocarbon oil and a phenyl ether synthetic oil is used.
• diurea greases particularly aromatic diurea is often used because of its high temperature resistance.
• this kind of grease lacks the property to easily flow into the lubricating unit and thus generates a flaking due to insufficiency of lubricant.
• Patent Document 1 proposes a grease characterized in that a gelling agent is incorporated as an essential ingredient in a base oil comprising more than 50% by weight of ether synthetic oil, which gelling agent comprises at least one of diurea compounds represented by the following general formula,
• R 1 represents a C 6 -C 15 divalent aromatic hydrocarbon group
• R 2 and R 3 are the same or different groups and each of R 2 and R 3 represents a cyclohexyl group, a C 7 -C 12 cyclohexyl derivative group or a C 8 -C 20 alkyl group
• gelling agent the content ratio of cyclohexyl group or derivative group thereof [ ⁇ (cyclohexyl group or derivative group thereof)/(cyclohexyl group or derivative group thereof+alkyl group) ⁇ 100 ⁇ is 50 to 100%.
• the thickener is short and needs improvement in the flaking.
• Patent Document 1 JP 2979274 B
• An object of the present invention is to provide a grease composition which contains a large amount of a thickener and which prevents flaking effectively for a long period and which has an excellent inflow property, and machine elements in which the grease is filled.
• Another object of the present invention is to provide a grease composition which, if used for machine elements such as constant-velocity joints, gears, rolling bearing and the like, has an improved property to easily flow into the lubrication unit and has a long fatigue life even under high temperature conditions, and machine elements in which the grease is filled.
• the present invention provides the grease composition described below and machine elements using the grease composition.
• a grease composition comprising a thickener and a base oil, characterized in that the thickener contains a diurea compound represented by the Formula (I),
• R 1 and R 3 are a phenyl group and/or a cyclohexyl group
• R 2 is a C 6 -C 15 divalent hydrocarbon group
• the molar ratio of cyclohexyl group/(cyclohexyl group+phenyl group) in R 1 and R 3 is 0.95 to 0.10.
• the grease composition of the present invention contains a sufficient amount of thickener and the inflow property of the grease composition into the lubrication unit is improved, the fatigue life of machine elements such as constant-velocity joint, gear and bearing is long.
• the grease composition of the present invention may be generally applied to rolling bearing.
• the grease composition of the present invention may suitably be used for rolling bearings for automobile instruments or auxiliaries which rolling bearings have flaking problems.
• Such bearings include electromagnetic clutches for automobile air conditioners; bearings used for intermediate pulley, idler pulley and tension pulley and bearings used for alternators.
• the grease composition of the present invention is suitably used for constant velocity joints such as fixed-type (e.g., Rzeppa-type and Barfield-type) constant-velocity joints; and slide-type (e.g., double offset type and cross groove type) constant-velocity joints.
• fixed-type e.g., Rzeppa-type and Barfield-type
• slide-type e.g., double offset type and cross groove type
• a 1 flaking is associated with the service life, which needs improvement.
• the present invention was completed based on the finding that a grease composition which uses a specific diurea thickener may effectively prevent the direct contact between both the surfaces lubricating each other, and improves anti-flaking property without increasing the viscosity of the base oil.
• the grease composition of the present invention comprising a specific diurea compound as a thickener easily enters between the lubricating surfaces of rolling to prevent the direct contact of both the surfaces of the metals and to effectively prevent a flaking.
• the base oil used for the present invention is not restricted and those usually used for grease compositions may be employed.
• a base oil having a kinematic viscosity of 10 to 400 mm 2 /s, more preferably 20 to 250 mm 2 /s, and still more preferably 40 to 150 mm 2 /s at a temperature of 40° C. is preferred.
• Examples of the base oil include mineral oils, synthetic oils and natural oils.
• Examples of the synthetic oils include hydrocarbon oils, aromatic oils, ester oils and ether oils.
• Examples of the hydrocarbon oils include poly- ⁇ -olefins such as normal paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer, 1-decene and ethylene co-oligomer and hydrogenation products thereof.
• Examples of the aromatic oils include alkyl benzenes such as monoalkyl benzenes and dialkyl benzenes and alkyl naphthalenes such as monoalkyl naphthalenes, dialkyl naphthalenes and polyalkyl naphthalenes.
• ester oils examples include diester oils such as dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate and ditridecyl glutarate; aromatic ester oils such as trimellitic acid esters, pyromellitic acid esters; polyol ester oils such as trimethylolpropane esters, pentaerythritol esters and dipentaerythritol esters; and complex ester oils which are oligoesters of polyhydric alcohols and fatty acid mixtures of dibasic acid monobasic acid.
• ether oils examples include polyglycols such as polyethylene glycol, polypropylene glycol, polyethylene glycol mono-ethers and polypropylene glycol mono-ethers; and phenyl ether oils such as monoalkyl triphenyl ethers, alkyl diphenyl ethers, pentaphenyl ether, tetraphenyl ether, monoalkyl tetraphenyl ethers and dialkyl tetraphenyl ethers.
• phenyl ether oils such as monoalkyl triphenyl ethers, alkyl diphenyl ethers, pentaphenyl ether, tetraphenyl ether, monoalkyl tetraphenyl ethers and dialkyl tetraphenyl ethers.
• other synthetic oils include tricresyl phosphate, silicone oils and perfluoro alkyl ethers.
• oils examples include fats and oils such as beef tallow, lard, soybean oil, rape oil, rice bran oil, coconut oil, palm oil, palm kernel oil and hydrogenation products thereof. These base oils may be used individually or as a mixture of two or more of them.
• the thickener used for the grease composition of the present invention is a diurea compound represented by the above-described formula (I).
• R 1 and R 3 are a phenyl group and/or a cyclohexyl group, and the molar ratio of cyclohexyl group/(cyclohexyl group+phenyl group) in R 1 and R 3 is 0.95 to 0.10, and preferably 0.90 to 0.15.
• R 2 is a C 6 -C 15 divalent hydrocarbon group such as a linear or branched alkylene group, a linear or branched alkenylene group, a cycloalkylene group or an aromatic group.
• the diurea thickener used in the present invention may be obtained by, for example, reacting a prescribed diisocyanate and a prescribed monoamine.
• a prescribed diisocyanate include diphenylmethane-4,4′-diisocyanate (MDI) and tolylene diisocyanate (TDI).
• a mixture of aniline and cyclohexylamine is used in a prescribed ratio.
• a mixture of a diurea obtained from a diisocyanate and aniline, and a diurea obtained from a diisocyanate and cyclohexylamine, containing the diureas at the above-described prescribed ratio may also be used.
• the content of the thickener in the grease composition of the present invention may be the amount which is appropriate for obtaining the required consistency, and the content is usually preferably 1 to 20%, more preferably 2 to 20% by mass based on the total mass of the grease composition.
• the grease composition of the present invention may contain additives such as extreme pressure additives, antioxidants, rust preventives and anticorrosives, which are usually used for grease compositions.
• a diurea compound was prepared by reacting diphenylmethane-4,4′-diisocyanate with aniline and/or cyclohexylamine in a prescribed ratio in a base oil. Then the base oil was added to the diurea compound in an amount to attain a consistency of 300 to prepare a test grease composition.
• the base oils used are the following two kinds.
• Mineral oil 500 neutral oil (kinematic viscosity at 40° C.: 100 mm 2 /s)
• Alkyl diphenyl ether oil MORESCO HILUBE LB 100 (Matsumura Oil Research Corp.; kinematic viscosity at 40° C.: 100 mm 2 /s)
• the fatigue life test of the grease composition was estimated by the following rolling four ball test.
• Three bearing steel balls having a diameter of 15 mm are provided and placed into a cylindrical container having an inside diameter at the bottom of 36.0 mm, an inside diameter at the top end of 31.63 mm and a depth of 10.95 mm, and then 20 g of a test grease is applied.
• a steel ball for bearing having a diameter of 5 ⁇ 8 inches is contacted and when the steel ball is rotated at a prescribed rotation rate, the bottom three steel balls revolve while rotating. These steel balls are allowed to rotate continuously until a flaking occurs on the surface of the steel ball.
• a flaking occurs between balls where the contact pressure is the highest.
• the fatigue life is defined as a total rotation number at the time when a flaking occurs.
• Test steel ball ( ⁇ 5 ⁇ 8 inch steel ball for bearing (rotating ball), ( ⁇ 15 mm steel ball for bearing (driven ball)
• compositions of the grease compositions and the test results are show in Table 1 and Table 2.

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

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• 2007
  • 2007-03-08 JP JP2007058772A patent/JP4809793B2/ja active Active
• 2008
  • 2008-03-10 US US12/530,119 patent/US20100029521A1/en not_active Abandoned
  • 2008-03-10 WO PCT/JP2008/054280 patent/WO2008108489A1/ja active Application Filing
  • 2008-03-10 CN CN200880010798A patent/CN101652456A/zh active Pending
  • 2008-03-10 EP EP08721696.6A patent/EP2135924B1/en active Active
  • 2008-03-10 KR KR1020097018690A patent/KR101265167B1/ko active IP Right Grant

Patent Citations (11)

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