WO2013031705A1 - グリース組成物及び転動装置 - Google Patents
グリース組成物及び転動装置 Download PDFInfo
- Publication number
- WO2013031705A1 WO2013031705A1 PCT/JP2012/071509 JP2012071509W WO2013031705A1 WO 2013031705 A1 WO2013031705 A1 WO 2013031705A1 JP 2012071509 W JP2012071509 W JP 2012071509W WO 2013031705 A1 WO2013031705 A1 WO 2013031705A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- grease composition
- bearing
- test
- base oil
- Prior art date
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- CTJJGIVJOBVMEO-UHFFFAOYSA-N tetraoctyl benzene-1,2,4,5-tetracarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC(C(=O)OCCCCCCCC)=C(C(=O)OCCCCCCCC)C=C1C(=O)OCCCCCCCC CTJJGIVJOBVMEO-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical class C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- SMYKBXMWXCZOLU-UHFFFAOYSA-N tris-decyl benzene-1,2,4-tricarboxylate Chemical compound CCCCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCCCC)C(C(=O)OCCCCCCCCCC)=C1 SMYKBXMWXCZOLU-UHFFFAOYSA-N 0.000 description 1
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
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Images
Classifications
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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
- C10M169/02—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
- C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
- C10M171/02—Specified values of viscosity or viscosity index
-
- 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
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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
- 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
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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
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- 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
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- 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
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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
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- 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
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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
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- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/16—Naphthenic acids
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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
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- C10M2207/28—Esters
- C10M2207/2805—Esters used as base material
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/287—Partial esters
- C10M2207/288—Partial esters containing free carboxyl groups
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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
- 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
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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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
- 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
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral 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
- C10M2223/047—Thioderivatives not containing metallic elements
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- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
-
- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/067—Unsaturated Compounds
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- 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
- C10N2030/02—Pour-point; Viscosity index
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- 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
- C10N2030/08—Resistance to extreme temperature
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- 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
- C10N2030/26—Waterproofing or water resistance
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- 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
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- 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
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- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
- F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
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- 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
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
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- 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
Definitions
- the present invention relates to a grease composition having water resistance that is sealed in a bearing used in an environment in contact with water.
- the present invention also relates to a rolling device enclosing the grease composition.
- a so-called “hub unit bearing” with a seal as shown in FIG. 1 is often used as a bearing for a vehicle such as an automobile or a railway vehicle.
- a hub unit bearing shown in FIG. 1
- a flange 3 is formed, and an inner ring raceway 4a and a stepped portion 5 are formed on the outer peripheral surface of the intermediate portion.
- the inner ring element 1 having the inner ring raceway 4b formed on the outer peripheral surface has a stepped portion on the outer end surface (left end surface in the drawing). 5 is supported by external fitting in a state where it abuts against 5.
- a male screw portion 6 is formed at a portion near the inner end of the hub 2. Then, the inner ring element 1 is fixed to a predetermined portion of the outer peripheral surface of the hub 2 by screwing the nut 7 into the male screw portion 6 and further tightening.
- an outward flange-like attachment portion 9 is provided for fixing the outer ring 8 to a suspension device (not shown).
- outer ring raceways 10a and 10b are formed on the inner peripheral surface of the outer ring 8 so as to face the inner ring raceways 4a and 4b, respectively.
- a plurality of rolling elements 11, 11 are provided between the inner ring raceways 4a, 4b and the pair of outer ring raceways 10a, 10b, respectively, to freely rotate the hub 2 inside the outer ring 8.
- Each of these rolling elements 11 and 11 is held in each row so as to be freely rollable by holders 12 and 12, respectively.
- a seal ring 13 made of an elastic material typified by a nitrile rubber composition is attached between the inner peripheral surface of the outer end of the outer ring 8 (left end in the figure) and the outer peripheral surface of the hub 2.
- the seal ring 13 is provided between the inner peripheral surface of the outer ring 8 and the outer peripheral surfaces of the hub 2 and the inner ring element 1, and the outer end opening of a space 15 provided with a plurality of rolling elements 11, 11. 28 is blocked.
- the inner end (right end in the figure) opening of the outer ring 8 is closed by a cover 14, and foreign matter such as dust and rainwater enters the space 15 from the inner end opening, and the inside of the space 15.
- the grease (not shown) filled in is prevented from leaking.
- unit bearings of double row ball bearings as shown in the figure are used, but in large automobiles, unit bearings of double row tapered roller bearings using tapered rollers as rolling elements 11 in FIG.
- unit bearings of double row tapered roller bearings using tapered rollers as rolling elements 11 in FIG.
- the same tapered roller bearing unit bearing or a double row cylindrical roller bearing unit bearing using a cylindrical roller as the rolling element 11 is often used.
- Patent Document 1 discloses that the kinematic viscosity at 100 ° C. is 5.0 ⁇ 10 ⁇ 6 to 9.0 ⁇ .
- a rolling bearing unit for vehicle transportation that uses grease of 10 ⁇ 6 m 2 / s (5 to 9 cSt).
- the grease described in Patent Document 1 is effective for lowering the torque of the wheel-supporting rolling bearing unit
- the base oil has a lower viscosity than before, so that the oil film thickness on the friction surface is sufficiently large.
- the durable life of the wheel bearing rolling bearing unit will be insufficient. Therefore, when it is intended to achieve high performance of the wheel support rolling bearing unit by means of design, the grease described in Patent Document 1 can be applied to any design of wheel support rolling bearing unit. There was room for consideration because it was not.
- the hub unit bearing supports the mass of the vehicle via the evening gear, and receives radial, thrust and moment loads from the tire ground according to the running state of the vehicle, and also an impact load, so the bearing is likely to be worn.
- a method of increasing the viscosity of the base oil and increasing the thickness of the lubricating oil film has been taken as an anti-wearing technique, but a sufficient effect has not been obtained and there is room for examination.
- hubs are required to have improved maneuverability (maneuverability and stability) and fuel efficiency, and are also required to have less change in bearing torque against changes in hub bearing pressure. .
- the present invention has been made paying attention to the above problems, and its purpose is low torque, wear resistance, fretting resistance at low temperatures, water resistance, low friction characteristics, and when encapsulated in a bearing. It is an object of the present invention to provide a grease composition that is excellent in low leakage and can maintain a good lubricating state for a long time, and a rolling device in which the grease composition is enclosed.
- This invention is based on the said knowledge by the present inventors, and provides the following grease composition and rolling device in order to solve the said subject.
- a grease composition wherein the base oil has a pressure viscosity coefficient at 40 ° C. of 33 GPa ⁇ 1 or less, and the projected area ratio of the thickener is 10 area% or more.
- a rolling element characterized in that a plurality of rolling elements are movably held between an inner ring and an outer ring via a cage, and the grease composition described in (1) above is enclosed. Moving device.
- the projected area ratio of the thickener is an area ratio occupied by fibers and particles of the thickener present in the visual field when a grease composition having a thickness of 0.1 mm is photographed with an optical microscope. is there.
- the thickener fibers and particles appear black, and the base oil appears transparent or white. Therefore, the projected area ratio of the thickener is obtained by binarizing the optical micrograph and calculating the area ratio of the black portion in the field of view.
- the thickener is a diurea compound represented by the following general formula (I) or general formula (II), particularly an aromatic diurea compound represented by the following general formula (I), and the amount of the thickener Is 10 to 40% by mass based on the total amount of the grease composition.
- R 2 —NHCONH—R 1 —NHCONH—R 3 ...
- General formula (I) (In the general formula (I), R 1 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms, R 2 and R 3 represent an aromatic hydrocarbon group having 6 to 12 carbon atoms. R 2 and R 3 represent They may be the same or different.)
- R 5 —NHCONH—R 4 —NHCONH—R 6 ...
- R 4 is an aromatic hydrocarbon group having 6 to 15 carbon atoms
- R 5 and R 6 are aliphatic hydrocarbon groups having 6 to 20 carbon atoms
- cyclohexyl derivatives having 6 to 12 carbon atoms.
- the ratio of the cyclohexyl derivative group in the total amount of R 5 and R 6 is 50 to 90 mol%, and R 5 and R 6 may be the same or different.
- a rust inhibitor and an antiwear agent are included.
- the rust inhibitor is a carboxylic acid rust inhibitor, a carboxylate rust inhibitor, or an amine rust inhibitor.
- the antiwear agent is triphenyl phosphorothioate.
- the grease composition has a pour point of ⁇ 35 ° C. or lower and a kinematic viscosity of 70 to 150 mm 2 / s.
- the grease composition of the present invention is excellent in low torque, wear resistance, fretting resistance at low temperatures, water resistance, low friction characteristics, and low leakage when encapsulated in a bearing, and maintains a good lubrication state for a long time. it can.
- the rolling device of the present invention in which such a grease composition is enclosed exhibits excellent lubrication performance even in an environment in contact with water, and has a long life.
- the grease composition contains a base oil, a thickener, a rust inhibitor, and an antiwear agent.
- Base oil mineral oil, synthetic oil or a mixed oil thereof is preferable.
- mineral oils include paraffinic mineral oils and naphthenic mineral oils that are refined by appropriately combining vacuum distillation, oil removal, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, clay purification, hydrorefining, etc. Can be mentioned.
- Synthetic oils include hydrocarbon oils, aromatic oils, ester oils, ether oils, and the like.
- hydrocarbon oil it is preferable to employ hydrocarbon oil in terms of good torque characteristics and good durability of the bearing rubber seal.
- Specific examples of the hydrocarbon oil include normal paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer, poly- ⁇ -olefin such as 1-decene and ethylene co-oligomer, and hydrides thereof. .
- aromatic oil examples include alkylbenzenes such as monoalkylbenzene and dialkylbenzene, and alkylnaphthalenes such as monoalkylnaphthalene, dialkylnaphthalene and polyalkylnaphthalene.
- ester oils include dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl glutarate, and methyl acetyl cinnolate, or trioctyl triole.
- Aromatic ester oils such as melitrate, tridecyl trimellitate, tetraoctyl pyromellitate, trimethylolpropane caprylate, trimethylolpropane verargonate, pentaerythritol-2-ethylhexanoate, pentaerythritol belargo
- polyol ester oils such as nates, and complex ester oils that are oligoesters of polyhydric alcohols and mixed fatty acids of dibasic acids and monobasic acids.
- ether oil examples include polyethylene glycol, polypropylene glycol, polyethylene glycol monoether, polyglycol such as polypropylene glycol monoether, or monoalkyl triphenyl ether, alkyl diphenyl ether, dialkyl diphenyl ether, pentaphenyl ether, tetraphenyl ether, And phenyl ether oils such as monoalkyl tetraphenyl ether and dialkyl tetraphenyl ether.
- the base oil preferably has a kinematic viscosity at 40 ° C. of 70 to 150 mm 2 / s in order to avoid occurrence of abnormal noise at low-frequency startup and seizure that occurs because an oil film is difficult to form at high temperatures. More preferably, it is 70 to 130 mm 2 / s, and particularly preferably 70 to 100 mm 2 / sec.
- the base oil preferably has a pour point of ⁇ 35 ° C. or lower. When the pour point of the base oil exceeds ⁇ 35 ° C., the fretting wear at low temperatures is inferior.
- the dielectric constant When the base oil is only synthetic oil, it is preferable that the dielectric constant at 25 ° C. and 1 MHz is less than 4 in order to avoid seizure and wear due to the improvement of the oil film thickness.
- the dielectric constant is 4 or more, the aggregate area ratio of the thickener in the grease decreases, and the effect of improving the oil film thickness cannot be obtained.
- a base oil having a dielectric constant of less than 1.9 is difficult to obtain, and the dielectric constant is substantially 1.9 or more and less than 4.
- the base oil has a pressure viscosity coefficient at 40 ° C. of 33 GPa ⁇ 1 or less, and preferably 27 GPa ⁇ 1 or less.
- the pressure viscosity coefficient ⁇ of the base oil at 40 ° C. can be calculated using the following So-Klaus estimation formula.
- ⁇ 0 is the kinematic viscosity of the base oil at 40 ° C.
- ⁇ is the density of the base oil at 40 ° C. is there.
- ⁇ 1.030 + 3.509 (log ⁇ 0 ) 3.0627 + 2.412 ⁇ 10 ⁇ 4 m 0 5.1903 (log ⁇ 0 ) 1.5976 -3.387 (log ⁇ 0 ) 3.0975 ⁇ 0.1162
- the pressure viscosity coefficient is less than 23 GPa ⁇ 1, it is not preferable because the oil film forming property (base oil film thickness ratio) is lowered. Accordingly, the lower limit of the viscosity pressure coefficient is preferably 23 GPa- 1 .
- the viscosity index is preferably 115 to 190. If the viscosity index is less than 115, the rate of increase in viscosity at low temperatures is high, and the low-temperature fretting property may be reduced. If it exceeds 190, the oil film forming property (base oil film thickness ratio) may be reduced.
- the viscosity index is measured by the method described in HIS K2283.6.
- a diurea compound can be preferably used for the thickener.
- aliphatic diurea, alicyclic diurea, and aromatic diurea can be used.
- aromatic diurea is used in consideration of fretting wear caused by vibrations caused by operation.
- the thickener is preferably contained in an amount of 10 to 40% by mass based on the total amount of the grease composition. If the content of the thickener is less than 10% by mass, it becomes difficult to maintain the grease state, and leakage when encapsulated in the bearing becomes high. On the other hand, if the content of the thickener exceeds 40% by mass, the grease composition becomes too hard and the lubricating state cannot be fully exhibited, which is not preferable.
- the diurea compound represented by the following general formula (I) is preferable as the aromatic diurea.
- R 1 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms
- R 2 and R 3 represent an aromatic hydrocarbon group having 6 to 12 carbon atoms.
- R 2 and R 3 may be the same or different.
- the content of the diurea compound represented by the following general formula (I) is less than 10% by mass, it is difficult to maintain the grease state, which is not preferable.
- the content of the diurea compound represented by the following general formula (I) exceeds 40% by mass, the grease composition becomes too hard and the lubricating state cannot be sufficiently exhibited. Absent.
- R 2 NHCONH—R 1 —NHCONH—R 3 ...
- aliphatic diurea or alicyclic diurea As the aliphatic diurea or alicyclic diurea, specifically, a diurea compound represented by the following general formula (II) is preferable.
- R 4 is an aromatic hydrocarbon group having 6 to 15 carbon atoms
- R 5 and R 6 are aliphatic hydrocarbon groups having 6 to 20 carbon atoms, and 6 to 12 carbon atoms. Represents a cyclohexyl derivative group, the proportion of the cyclohexyl derivative group in the total amount of R 5 and R 6 is 50 to 90 mol%, and R 5 and R 6 may be the same or different.
- rust inhibitor a carboxylic acid rust inhibitor, a carboxylate rust inhibitor, and an amine rust inhibitor are preferable, and it is particularly preferable to use a combination of these three types. By combining these three kinds of rust preventives, water resistance can be improved more than before.
- the content of the rust inhibitor relative to the total amount of the grease composition is preferably 1% by mass or more.
- the carboxylic acid-based rust inhibitor and the carboxylate-based rust inhibitor are each preferably 0.1 to 5% by mass based on the total amount of the grease composition. If the addition amount is less than 0.1% by mass, a sufficient effect cannot be obtained, and even if the addition amount exceeds 5%, the effect is not improved.
- the addition amount of the carboxylic acid rust inhibitor and the carboxylate rust inhibitor is more preferably 0.5 to 3% by mass.
- the addition amount of the amine rust inhibitor is preferably 0.1 to 3% by mass of the total amount of grease.
- the amount of amine-based rust inhibitor added is less than 0.1% by mass, a sufficient effect cannot be obtained, and adding more than 3% does not improve the effect and increases the amount of adsorption on the bearing member surface. Therefore, there is a risk of inhibiting the formation of an oxide film or the like derived from the enclosed grease.
- carboxylic acid-based antirust agent examples include monocarboxylic acids, linear fatty acids such as lauric acid and stearic acid, and saturated carboxylic acids having a naphthene nucleus.
- Dicarboxylic acids include succinic acid derivatives such as succinic acid, alkyl succinic acid, alkyl succinic acid half ester, alkenyl succinic acid, alkenyl succinic acid half ester, succinimide, hydroxy fatty acid, mercapto fatty acid, sarcosine derivative, and wax or Examples thereof include an oxidized wax such as an oxide of petrolatum. Among them, succinic acid half ester is preferable.
- carboxylate rust inhibitor examples include fatty acid, naphthenic acid, abietic acid, lanolin fatty acid, alkenyl succinic acid, and metal salts of amino acid derivatives.
- metal element of the metal salt examples include cobalt, manganese, zinc, aluminum, calcium, barium, lithium, magnesium, copper, and the like. Of these, zinc naphthenate is preferred.
- amine-based rust preventive examples include alkoxyphenylamines, amine salts of fatty acids, and partial amides of dibasic carboxylic acids. Of these, fatty acid amine salts are preferred.
- the antiwear agent is preferably a sulfur-phosphorus (SP) compound.
- SP sulfur-phosphorus
- Specific examples include triphenyl phosphate compounds and dithiophosphate compounds. Among them, triphenyl phosphorothioate (TPPT) represented by the following general formula (III) is preferable.
- the content of the antiwear agent is preferably 0.1 to 5% by mass with respect to the total amount of the grease composition. If the content is less than 0.1% by mass, a sufficient effect cannot be obtained, and if it exceeds 5%, the effect is not improved.
- antioxidants In order to further improve various performances, other additives may be added to the grease composition as desired.
- antioxidants extreme pressure agents, oiliness improvers, metal deactivators and the like can be added alone or in admixture of two or more.
- the content (addition amount) of these other additives is not limited as long as the effects of the present invention are not impaired, but is preferably 0.1 to 20% by mass of the total amount of the grease composition. If the addition amount is less than 0.1% by mass, the effect of addition is not sufficient, and even if added in excess of 20% by mass, the effect is saturated, and the amount of base oil is relatively small, so that the lubricity may be lowered. There is.
- antioxidant examples include amine-based antioxidants, phenol-based antioxidants, sulfur-based antioxidants, and zinc dithiophosphate.
- amine-based antioxidants include phenyl-1-naphthylamine, phenyl-2-naphthylamine, diphenylamine, phenylenediamine, oleylamidoamine, phenothiazine and the like.
- phenolic antioxidant examples include pt-butyl-phenyl salicylate, 2,6-di-t-butyl-p-phenylphenol, 2,2′-methylenebis (4-methyl-6- t-octylphenol), 4,4′-butylidenebis-6-t-butyl-m-cresol, tetrakis [methylene-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate] methane 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, n-octadecyl- ⁇ - (4′-hydroxy-3 ′, 5 '-Di-t-butylphenyl) propionate, 2-n-octyl-thio-4,6-di (4'-hydroxy-3', 5'-di-t-butyl) phenoxy-1,3,5- Hinders
- sulfur-based participation inhibitors include bis [2-methyl-4- ⁇ 3-n-alkyl (C12 or C14) thiopropionyloxy ⁇ -5-tert-butylphenyl] sulfide, dilauryl thiodipropionate, etc. Is mentioned.
- Examples of the extreme pressure agent include organic molybdenum.
- oil improver examples include fatty acids such as oleic acid and stearic acid, alcohols such as lauryl alcohol and oleyl alcohol, amines such as stearylamine and cetylamine, phosphate esters such as tricresyl phosphate, and animal and vegetable oils.
- fatty acids such as oleic acid and stearic acid
- alcohols such as lauryl alcohol and oleyl alcohol
- amines such as stearylamine and cetylamine
- phosphate esters such as tricresyl phosphate
- animal and vegetable oils examples include fatty acids such as oleic acid and stearic acid, alcohols such as lauryl alcohol and oleyl alcohol, amines such as stearylamine and cetylamine, phosphate esters such as tricresyl phosphate, and animal and vegetable oils.
- Metal deactivator examples include benzotriazole.
- ⁇ Projected area ratio of thickener is 10 area% or more>
- the projected area ratio of the thickener is 10 area% or more. If the projected area ratio is 10% by area or more, the surface of the raceway surface is well protected by the thickener, suppresses fretting wear that occurs during transportation, suppresses oil film degradation at high temperatures, and extends the service life. can do.
- the projected area ratio of the preferred thickener is 12 area% or more. However, if the projected area ratio of the thickener is too high, the amount of the base oil is relatively reduced and the lubricity is lowered. Therefore, the upper limit is preferably 50 area%.
- ⁇ Method for producing grease composition There is no particular limitation on the method for producing the grease composition, and it is appropriately selected according to the purpose.
- rust prevention is performed after reacting the raw material of the thickener (aromatic diurea compound) in the base oil.
- a constant amount of an agent and an antiwear agent are added, and the mixture is sufficiently stirred and kneaded with a kneader or a roll mill to obtain a uniform dispersion. In this process, it is also effective to heat.
- the present invention also provides a rolling device in which the above grease composition is enclosed.
- the rolling device is not limited, and the above grease composition is applied to lubricating parts such as various rolling bearings, linear guide devices, and ball screw devices in addition to the vehicle hub unit bearing as shown in FIG.
- the grease composition is excellent in various properties such as water resistance, and particularly exhibits excellent lubricating performance even in an environment in contact with water, resulting in a long life.
- Examples 1 to 45, Comparative Examples 1 to 18 A grease composition having the composition shown in Table 1 was prepared, and for each grease composition, the following (1) bearing torque test, (2) friction test, (3) high-speed four-ball test (abrasion resistance test), (4 ) Fretting resistance test, (5) Rolling four-ball test (water resistance test), (6) Bearing leakage test, (7) Low temperature fretting test, and (8) High temperature standing test.
- the outline of each of the tests (1) to (8) will be described below, and the results of each test are also shown in Table 1. Further, (9) Thickener projected area ratio, (10) Base oil dielectric constant, and (11) Base oil film thickness ratio were measured. The results are also shown in Table 1.
- mineral oil M1 is a mineral oil having a kinematic viscosity at 40 ° C. of 30 mm 2 / s.
- mineral oil M2 is a mineral oil having a kinematic viscosity at 40 ° C. of 70 mm 2 / s.
- mineral oil M3 is a mineral oil having a kinematic viscosity at 40 ° C. of 75 mm 2 / s.
- Mineral oil M4 is a mineral oil having a kinematic viscosity at 40 ° C. of 100 mm 2 / s.
- Mineral oil M5 is a mineral oil having a kinematic viscosity at 40 ° C. of 130 mm 2 / s.
- Mineral oil M6 is a mineral oil having a kinematic viscosity at 40 ° C. of 150 mm 2 / s.
- poly ⁇ -olefin oil P1 is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 30 mm 2 / s.
- the “poly ⁇ -olefin oil P2” is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 70 mm 2 / s.
- Poly ⁇ -olefin oil P3 is a poly- ⁇ -olefin having a kinematic viscosity at 40 ° C. of 75 mm 2 / s.
- the “poly ⁇ -olefin oil P4” is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 100 mm 2 / s.
- the “poly ⁇ -olefin oil P5” is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 130 mm 2 / s.
- the “poly ⁇ -olefin oil P6” is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 150 mm 2 / s.
- the “poly ⁇ -olefin oil P7” is a poly ⁇ -olefin oil having a kinematic viscosity at 40 ° C. of 400 mm 2 / s.
- ester oil ES1 is an ester oil having a kinematic viscosity at 40 ° C. of 30 mm 2 / s.
- ester oil ES2 is an ester oil having a kinematic viscosity at 40 ° C. of 70 mm 2 / s.
- ester oil ES3 is an ester oil having a kinematic viscosity at 40 ° C. of 75 mm 2 / s.
- “Ester oil ES4” is an ester oil having a kinematic viscosity at 40 ° C. of 100 mm 2 / s.
- Ester oil ES5 is an ester oil having a kinematic viscosity at 40 ° C. of 130 mm 2 / s.
- Ester oil ES6 is an ester oil having a kinematic viscosity at 40 ° C. of 150 mm 2 / s.
- Ester oil ES7 is an ester oil having a kinematic viscosity at 40 ° C. of 400 mm 2 / s.
- ether oil ET1 is an ether oil having a kinematic viscosity at 40 ° C. of 30 mm 2 / s.
- ether oil ET2 is an ether oil having a kinematic viscosity at 40 ° C. of 70 mm 2 / s.
- ether oil ET3 is an ether oil having a kinematic viscosity at 40 ° C. of 75 mm 2 / s.
- “Ether oil ET4” is an ether oil having a kinematic viscosity at 40 ° C. of 100 mm 2 / s.
- “Ether oil ET5” is an ether oil having a kinematic viscosity at 40 ° C. of 130 mm 2 / s.
- “Ether oil ET6” is an ether oil having a kinematic viscosity at 40 ° C. of 400 mm 2 / s.
- “Glycol oil G” is a polyglycol oil having a kinematic viscosity of 75 mm 2 / s at 40 ° C.
- aromatic diurea is a diurea compound formed by the reaction of 4,4′-diphenylmethane diisocyanate and p-toluidine.
- alicyclic diurea is a diurea compound formed by the reaction of 4,4′-diphenylmethane diisocyanate and cyclohexylamine.
- aliphatic diurea is a diurea compound formed by the reaction of 4,4′-diphenylmethane diisocyanate and stearylamine.
- bearing torque test A single-row deep groove ball bearing with a non-contact seal (inner diameter: 17 mm, outer diameter: 40 mm, width: 12 mm) is made with each grease composition shown in Table 1 to produce a test bearing. did. The test bearing was rotated for 600 seconds at a rotational speed of 450 r / min, an axial load of 392 N, and a radial load of 29.4 N, and then the rotational torque was measured.
- the evaluation standard is a relative torque value with respect to Comparative Example 1, and the grease composition filled in the test bearing having the relative torque value of less than 1.0 was regarded as acceptable.
- the evaluation results are shown in Table 1. All of the test bearings of Comparative Examples 1 to 13 are 1.0 or more, while all of the test bearings of Examples 1 to 45 have a relative torque value of 1. It is less than 0 and satisfies the acceptance criteria.
- the rotating sphere was rotated in the same manner, and a load (welding load) when welding occurred was obtained.
- the abrasion resistance is evaluated by the maximum non-seizure load (LNS L: Last Non-seizure Load) and the welding load (WP: Weld Point), and the maximum non-seizure load is 490 N or more.
- the welding load was 1236 N or more, respectively (Good).
- the evaluation results are shown in Table 1.
- Rolling four-ball test The water resistance of each grease composition was evaluated by a rolling four-ball test. That is, three steel balls for bearing with a diameter of 15 mm were prepared, placed in a regular triangle shape in a cylindrical container with an inner diameter of 36.0 mm at the bottom, an inner diameter of 31.63 mm at the upper end, and a depth of 10.98 mm. 20 g of 20% water mixed in the product is applied, and another 5/8 inch diameter bearing ball is placed in a recess formed by 3 steel balls, and 5/8 inch diameter at room temperature. The bearing steel balls were rotated at 1000 min ⁇ 1 while applying a surface pressure of 4.1 GPa. As a result, three steel balls for bearings having a diameter of 15 mm revolve while rotating, but were continuously rotated until separation occurred. The total number of revolutions when peeling occurred was defined as the life. The evaluation results are shown in Table 1.
- Base oil oil film thickness ratio The oil film thickness ratio was determined using a ball-on-disk tester (room temperature, surface pressure 0.5 GPa, rolling speed 0.1 m / s) using a light interference method and a base oil and grease composition. The oil film thickness of the grease composition was measured as the ratio of the oil film thickness of the grease composition to the oil film thickness of the base oil. The evaluation results are shown in Table 1.
- the grease composition having a pressure viscosity coefficient at 40 ° C. of 33 GPa ⁇ 1 or less and a thickener projected area ratio of 10 area% or more has low temperature fretting properties, low torque properties, and oil film formation properties. It can also be seen that the leakage resistance when sealed in the bearing is excellent.
- grease compositions in which the base oil or thickener does not satisfy the above conditions have poor lubricity, and therefore any of torque characteristics, wear resistance, seizure resistance, and leakage resistance when encapsulated in a bearing. It turns out that the result is inferior.
- grease compositions containing three types of carboxylic acid-based rust preventive additives, carboxylate-based rust preventive additives, and amine-based rust preventive agents, and antiwear agents have anti-peeling properties, wear resistance, and fretting resistance. It can also be seen that it has excellent corrosion resistance.
- a grease composition containing barium sulfonate as a rust preventive agent without adding three kinds of carboxylic acid rust preventive additive, carboxylate rust preventive additive and amine rust preventive agent is sufficient. It can be seen that excellent peel resistance and corrosion resistance cannot be obtained.
- the carboxylic acid-based rust preventive additive, the carboxylate-based rust preventive additive, and the amine-based rust preventive agent have a function of suppressing an increase in the total acid value. It can also be seen that the grease composition containing no antiwear agent does not provide sufficient wear resistance. It can also be seen that a grease composition using an aliphatic urea compound as a thickener is inferior in fretting resistance.
- the content rate (mass%) of a rust preventive agent is 1 mass% or more with respect to the grease composition whole quantity.
- low torque resistance, wear resistance, fretting resistance at low temperatures, water resistance, low friction characteristics, and low leakage when encapsulated in a bearing, and a good lubrication state are long.
- a grease composition that can be maintained for a long time can be provided.
- Japanese patent applications filed on August 26, 2011 Japanese Patent Application No. 2011-184987
- Japanese patent applications filed on August 26, 2011 Japanese Patent Application No. 2011-184988
- Japanese patent application Japanese patent application (Japanese Patent Application No. 2011-209410)
- Japanese patent application filed on December 28, 2011 Japanese patent application filed on December 28, 2011
- Japanese patent application filed on December 28, 2011 Japanese Patent Application No. 2011-289572
- 2012 Japanese patent application
- the present invention is useful not only for vehicle hub unit bearings but also for various rolling bearings, linear guide devices, ball screw devices, and the like, particularly for rolling devices used in an environment in contact with water. First of all, it becomes excellent in various characteristics.
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Abstract
Description
(1)基油の40℃における圧力粘度係数が33GPa-1以下であり,かつ,増ちょう剤の投影面積率が10面積%以上であることを特徴とするグリース組成物。
(2)内輪と外輪との間に、保持器を介して複数の転動体を転動自在に保持してなり、かつ、上記(1)記載のグリース組成物を封入したことを特徴とする転動装置。
(1)増ちょう剤が、下記一般式(I)又は一般式(II)で表されたジウレア化合物、特に下記一般式(I)で表された芳香族系ジウレア化合物であり、増ちょう剤量がグリース組成物全量に対して10~40質量%である。
R2-NHCONH-R1-NHCONH-R3・・・・・・一般式(I)
(一般式(I)中のR1は炭素数6~15の芳香族系炭化水素基、R2及びR3は炭素数6~12の芳香族炭化水素基を示す。R2及びR3は同一であっても異なっていてもよい。)
R5-NHCONH-R4-NHCONH-R6・・・・・・一般式(II)
(一般式(II)中のR4は炭素数6~15の芳香族系炭化水素基、R5及びR6は炭素数6~20の脂肪族炭化水素基、炭素数6~12のシクロヘキシル誘導体基を示し、R5及びR6の全量中に占めるシクロヘキシル誘導体基の割合が、50~90モル%であり、R5及びR6は同一であっても異なっていてもよい。)
(2)添加剤として、防錆剤及び摩耗防止剤を含む。
(3)防錆剤が、カルボン酸系防錆剤、カルボン酸塩系防錆剤、アミン系防錆剤である。
(4)摩耗防止剤がトリフェニルホスホロチオエートである。
(5)グリース組成物の流動点が-35℃以下であり、動粘度が70~150mm2/sである。
(6)基油が、鉱油と合成油との混合油であり、混合比(質量%)が鉱油:合成油=0:100~20:80である。
(7)防錆剤が、カルボン酸系防錆添加剤、カルボン酸塩系防錆添加剤及びアミン系防錆剤の3種であり、3種の防錆剤の含有量がグリース全量の1質量%以上である。
グリース組成物は、基油と、増ちょう剤と、防錆剤と、摩耗防止剤とを含有する。
基油としては、鉱油、合成油又はこれらの混合油が好ましく、混合油が用いられる場合は、鉱油と合成油の混合比(質量%)が、鉱油:合成油=0:100~20:80であることが好ましい。合成油の混合割合が80質量%未満であると、良好なトルク特性と耐熱性とが維持できない。
また、基油は、低音起動時の異音発生や、高温で油膜が形成され難いために起こる焼付きを避けるために、40℃における動粘度が70~150mm2/sであることが好ましく、70~130mm2/sであることがより好ましく、70~100mm2/secであることが特に好ましい。
基油は、流動点が-35℃以下であることが好ましい。基油の流動点が-35℃を超えると、低温時のフレッチング摩耗が劣る。
基油は、合成油のみである場合は、油膜厚さ向上による焼付、摩耗を避けるために、25℃、1MHzにおける誘電率が4未満であることが好ましい。誘電率が4以上となると、グリース中の増ちょう剤の凝集体面積率が低下し、油膜厚さ向上の効果が得られない。また、鉱油と合成油とを混合した場合は、合成油の誘電率が4未満で、混合比(質量%)が鉱油:合成油=0:100~20:80であれば、油膜厚さ向上の効果を得ることができる。
基油は、40℃における圧力粘度係数が33GPa-1以下であり、27GPa-1以下であることが好ましい。基油の40℃における圧力粘度係数が33GPa-1を超えると、軸受トルクが高くなる。なお、基油の40℃における圧力粘度係数αは、下記のSo-Klausの推算式を用いて算出することができる。下記式において、ν0は40℃における基油の動粘度、m0はWalterの式(ν0=(10AT)-m0-0.7)の定数、ρは40℃における基油の密度である。
α=1.030+3.509(logν0)3.0627
+2.412×10-4m0 5.1903(logν0)1.5976
-3.387(logν0)3.0975ρ0.1162
基油のその他の特性としては、粘度指数が115~190であることが好ましい。粘度指数が115未満では低温での粘度の上昇率が高く、低温フレッチング性が低下するおそれがあり、190超では油膜形成性(基油油膜厚さ比)が低下するおそれがある。尚、粘度指数は、HIS K2283.6に記載の方法による測定される。
増ちょう剤には、ジウレア化合物が好適に使用できる。例えば、脂肪族ジウレア、脂環式ジウレア、芳香族ジウレアが使用できる。好ましくは、運転に伴う振動により生じるフレッチング摩耗を考慮して、芳香族ジウレアが用いられる。前記増ちょう剤は、当該グリース組成物全量に対して10~40質量%含有されることが好ましい。増ちょう剤の含有率が10質量%未満であると、グリース状態を維持することが困難になってしまい、軸受に封入した際の漏洩性が高くなる。一方、増ちょう剤の含有率が40質量%を超えると、グリース組成物が硬くなりすぎて、潤滑状態を十分に発揮することができなくなってしまうため、好ましくない。
芳香族ジウレアとして、具体的に、下記一般式(I)で表されたジウレア化合物が好ましい。なお、下記一般式(I)において、R1は炭素数6~15の芳香族系炭化水素基、R2及びR3は炭素数6~12の芳香族炭化水素基を示す。R2及びR3は同一であっても異なっていてもよい。
ここで、下記一般式(I)で表されたジウレア化合物の含有率が10質量%未満であると、グリース状態を維持することが困難になってしまうため、好ましくない。一方、下記一般式(I)で表されたジウレア化合物の含有率が40質量%を超えると、グリース組成物が硬くなりすぎて、潤滑状態を十分に発揮することができなくなってしまうため、好ましくない。
R2-NHCONH-R1-NHCONH-R3・・・・・・一般式(I)
脂肪族ジウレア又は脂環式ジウレアとして、具体的に、下記一般式(II)で表されたジウレア化合物が好ましい。なお、下記一般式(II)において、R4は炭素数6~15の芳香族系炭化水素基、R5及びR6は炭素数6~20の脂肪族炭化水素基、炭素数6~12のシクロヘキシル誘導体基を示し、R5及びR6の全量中に占めるシクロヘキシル誘導体基の割合が50~90モル%であり、R5及びR6は同一であっても異なっていてもよい。
ここで、下記一般式(II)で表されたジウレア化合物の含有率が10質量%未満であると、グリース状態を維持することが困難になってしまうため、好ましくない。一方、下記一般式(II)で表されたジウレア化合物の含有率が30質量%を超えると、グリース組成物が硬くなりすぎて、潤滑状態を十分に発揮することができなくなってしまうため、好ましくない。
R5-NHCONH-R4-NHCONH-R6・・・・・・一般式(II)
防錆剤としてカルボン酸系防錆剤、カルボン酸塩系防錆剤及びアミン系防錆剤が好ましく、特にこれら3種を組み合わせて使用することが好ましい。これら3種の防錆剤を組み合わせることで、これまでよりも耐水性を向上させることができる。
カルボン酸系防錆剤としては、モノカルボン酸では、ラウリン酸、ステアリン酸等の直鎖脂肪酸、並びにナフテン核を有する飽和カルボン酸が挙げられる。また、ジカルボン酸では、コハク酸、アルキルコハク酸、アルキルコハク酸ハーフエステル、アルケニルコハク酸、アルケニルコハク酸ハーフエステル、コハク酸イミド等のコハク酸誘導体、ヒドロキシ脂肪酸、メルカプト脂肪酸、ザルコシン誘導体、並びにワックスやペトロラタムの酸化物等の酸化ワックス等が挙げられる。中でも、コハク酸ハーフエステルが好適である。
カルボン酸塩系防錆剤としては、脂肪酸、ナフテン酸、アビエチン酸、ラノリン脂肪酸、アルケニルコハク酸、アミノ酸誘導体の各金属塩等が挙げられる。なお、前記金属塩の金属元素としては、コバルト、マンガン、亜鉛、アルミニウム、カルシウム、バリウム、リチウム、マグネシウム、銅等が挙げられる。中でも、ナフテン酸亜鉛が好適である。
アミン系防錆剤としては、アルコキシフェニルアミン、脂肪酸のアミン塩、二塩基性カルボン酸の部分アミド等を挙げることができる。中でも、脂肪酸のアミン塩が好適である。
摩耗防止剤としては、硫黄-リン系(SP系)化合物が好ましい。具体的には、トリフェニルフォスフェート系化合物やジチオフォスフェート系化合物が挙げられるが、中でも下記一般式(III)で表されるトリフェニルホスホロチオエート(TPPT)が好適である。
グリース組成物には、各種性能を更に向上させるために、所望によりその他の添加剤を添加してもよい。例えば、酸化防止剤、極圧剤、油性向上剤、金属不活性化剤等をそれぞれ単独で、あるいは2種以上を混合して添加することができる。
酸化防止剤は、アミン系酸化防止剤、フェノール系酸化防止剤、硫黄系酸化防止剤、ジチオリン酸亜鉛等が挙げられる。
極圧剤としては、例えば、有機モリブデン等が挙げられる。
油性向上剤としては、オレイン酸やステアリン酸等の脂肪酸、ラウリルアルコールやオレイルアルコール等のアルコール、ステアリルアミンやセチルアミン等のアミン、リン酸トリクレジル等のリン酸エステル、動植物油等が挙げられる。
金属不活性化剤としては、例えば、ベンゾトリアゾール等が挙げられる。
上記したグリース組成物において、増ちょう剤の投影面積率は10面積%以上である。この投影面積率が10面積%以上であれば、増ちょう剤により軌道面表面が良好に保護され、輸送時などに発生するフレッチング摩耗を抑制し、かつ高温時の油膜低下を抑制し寿命を延長することができる。好ましい増ちょう剤の投影面積率は、12面積%以上である。但し、増ちょう剤の投影面積率が高すぎると、相対的に基油量が減ることになり、潤滑性が低下するため、上限は50面積%が好ましい。
グリース組成物の製造方法には特に制限はなく、目的に応じて適宜選択されるが、一般的には基油中で増ちょう剤(芳香族ジウレア化合物)の原料を反応させた後、防錆剤及び摩耗防止剤をそれぞれ定量添加し、ニーダやロールミル等で十分に攪拌し、均一分散して得られる。なお、この処理に際し、加熱することも有効である。また、その他の添加剤を添加する場合は、防錆剤や摩耗防止剤と同時に添加することが工程上好ましい。
本発明はまた、上記のグリース組成物を封入した転動装置を提供する。転動装置には制限はなく、図1に示したような車両用ハブユニット軸受の他、各種転がり軸受、リニアガイド装置、ボールねじ装置等の潤滑部位に上記のグリース組成物を適用する。そして、上記のグリース組成物が持つ、耐水性をはじめとする各種特性に優れ、特に水との接触する環境においても優れた潤滑性能を示し、長寿命となる。
表1に示す組成のグリース組成物を調製し、各グリース組成物について、下記に示す(1)軸受トルク試験、(2)摩擦試験、(3)高速四球試験(耐摩耗性試験)、(4)耐フレッチング試験、(5)転がり四球試験(耐水性試験)、(6)軸受漏洩試験、(7)低温フレッチング試験、(8)高温放置試験を行った。上記(1)~(8)の各試験の概要を下記に説明すると共に各試験結果を表1に併記する。また、(9)増ちょう剤投影面積率、(10)基油誘電率、(11)基油油膜厚さ比を測定した。結果を表1に併記する。
非接触シ-ル付きの単列深溝玉軸受(内径17mm、外径40mm、幅12mm)に、表1に示す各グリース組成物を充慎して、供試軸受を作製した。そして、供試軸受を、回転数450r/min、アキシアル荷重392N、ラジアル荷重29.4Nにて600秒間回転させた後、回転トルクを測定した。評価基準は、比較例1に対する相対トルク値であり、この相対トルク値が1.0未満である供試軸受に充填されたグリース組成物を合格とした。評価結果を表1に示すが、比較例1~13の供試軸受は何れも1.0以上であるのに対して、実施例1~45の供試軸受は何れも相対トルク値が1.0未満であり、前記合格基準を満たしている。
ボールオンディスク試験機で各グリース組成物のすべり摩擦係数を測定した。試験片には、ボールに3/8インチ、ディスクに鏡面仕上げをしたSUJ2を用いた。試験条件は、ディスクに各グリース組成物を厚さ0.5mmで塗布し、垂直荷重4.9N、すべり速度1m/sとし、試験開始1秒後から2秒後までの1秒間の摩擦係数の平均を各グリース組成物の摩擦係数とした。評価基準は、比較例1に対する相対摩擦係数であり、この相対摩擦係数が1.0以下であるグリース組成物を合格とした。評価結果を表1に示すが、実施例1~45の各グリース組成物は何れも相対摩擦係数が1.0以下であり、前記合格基準を満たしている。
ASTM D2596に規定された高速四球試験により、各グリース組成物の耐摩耗性を評価した。即ち、各グリース組成物で充満された試験容器に3個の固定球を正三角形状に固定し、3個の鋼球で形成される窪みに、回転軸に取り付けた1個の回転球を置き、ある荷重を加えながら1770min-1で10秒間回転させ、そのときに固定球に生じた摩耗痕を測定した。そして、摩耗痕の平均直径がASTM D 2596に記された補償摩耗痕径値より小さくなるときの荷重(最大非焼付き荷重)を求めた。また、回転球を同様にして回転させ、溶着が生じたときの荷重(溶着荷重)を求めた。そして、耐摩耗性は最大非焼付き荷重(L.N.S.L:Last Non-seizure Load)及び溶着荷重(W.P.:Weld Point)により評価し、最大非焼付き荷重は490N以上、溶着荷重は1236N以上をそれぞれ合格(Good)とした。評価結果を表1に示す。
各グリース組成物について、ASTM D4170に規定された試験方法により耐フレッチング試験を行い、試験前後の質量差を測定し、下記3ランクに分類した。自動車用としてはAランク及びBランクが好ましいとされており、本試験でもAランク及びBランクを合格とした。評価結果を表1に示す。
Aランク:質量減が3mg以下
Bランク:質量減が3mg超5mg未満
Cランク:質量減が5mg以上
転がり四球試験により、各グリース組成物の耐水性を評価した。即ち、直径15mmの軸受用鋼球を3個用意し、底面の内径36.0mm、上端部の内径31.63mm、深さ10.98mmの円筒状容器内に正三角形状に置き、各グリース組成物に水を20%混入させたものを20g塗布し、更に3個の鋼球で形成される窪みに直径5/8インチの軸受用鋼球を1個置き、室温で、直径5/8インチの軸受用鋼球を面圧4.1GPaの負荷を加えながら1000min-1で回転させた。これにより、3個の直径15mmの軸受用鋼球も自転しながら公転するが、剥離が生じるまで連続回転させた。剥離が生じた時点の総回転数を寿命とした。評価結果を表1に示す。
各グリース組成物について、非接触シール付の単列深溝玉軸受(内径25mm、外径62mm、幅17mm)に封入すると共に、外輪温度80℃、アキシアル荷重98N、ラジアル荷重98N、回転速度5000min-1にて20時間連続回転させ、回転前後のグリース組成物の質量差からグリース組成物の漏洩率(軸受漏洩試験)を測定した。評価結果を表1に示す。なお、軸受漏洩試験の評価は、比較例1のグリース組成物の軸受漏洩試験の結果(グリース組成物の漏洩率)を1とした相対漏洩率が2.0以下を合格とし、相対漏洩率が2.0未満を不合格とした。
各グリース組成物について、SNR-FEB2試験(荷重:8000N,5時間、揺動角:6°、揺動サイクル:24Hz、温度:-20℃)により低温フレッチング試験を行い、試験前後の質量差を測定し、下記3ランクに分類した。自動車用としてはAランク及びBランクが好ましいとされており、本試験でもAランク及びBランクを合格とした。評価結果を表1に示す。
Aランク:質量減が20mg以下
Bランク:質量減が20mg超50mg未満
Cランク:質量減が50mg以上
各グリース組成物を金属板に厚さ2mmで塗布し、150℃の恒温槽に200時間放置した。その後、水酸化カリウムで全酸価を測定し、恒温放置していない当該グリース組成物の全酸価との差を計算した。この値はグリースの酸化が進んでいるほど大きな値を示し、劣化が進んでいるということができる。本実施例では、全酸価が減少したもの(負の値)を合格とした。評価結果を表1に示す。
各グリース組成物をスライドガラスに厚さ0.1mmで塗布し、光学顕微鏡写真を(OLYMPUS、BX51)で光学5倍レンズにて撮影して画像処理し、黒い部分を増ちょう剤とし、白い部分を基油と見做し、視野中に占める黒い部分(増ちょう剤)の面積割合(面積%)を算出した。評価結果を表1に示す。
各グリース組成物の基油の誘電率を、LCRメータを用いて測定した。測定値は、1MHz時の値とした。評価結果を表1に示す。
油膜厚さ比は,ボールオンディスク試験機(室温、面圧0.5GPa、転がり速度0.1m/s)で光干渉法を用いて基油とグリース組成物の油膜厚さを測定し,基油の油膜厚さに対するグリース組成物の油膜厚さの比とした。評価結果を表1に示す。
2 ハブ
4a,4b 内輪軌道
5 段部
6 雄ねじ部
7 ナット
8 外輪
10a,10b 外輪軌道
11 転動体
12 保持器
13 シールリング
Claims (2)
- 基油の40℃における圧力粘度係数が33GPa-1以下であり,かつ,増ちょう剤の投影面積率が10面積%以上であることを特徴とするグリース組成物。
- 内輪と外輪との間に、保持器を介して複数の転動体を転動自在に保持してなり、かつ、請求項1記載のグリース組成物を封入したことを特徴とする転動装置。
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JP2011-209410 | 2011-09-26 | ||
JP2011209410 | 2011-09-26 | ||
JP2011289572 | 2011-12-28 | ||
JP2011-289572 | 2011-12-28 | ||
JP2011289571 | 2011-12-28 | ||
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JP2012116841 | 2012-05-22 | ||
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US (1) | US20140199009A1 (ja) |
EP (1) | EP2749631A4 (ja) |
JP (1) | JPWO2013031705A1 (ja) |
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JP2019172760A (ja) * | 2018-03-27 | 2019-10-10 | Ntn株式会社 | グリース組成物およびグリース封入転がり軸受 |
WO2020105702A1 (ja) * | 2018-11-21 | 2020-05-28 | 協同油脂株式会社 | 円すいころ軸受用グリース組成物 |
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WO2016104010A1 (ja) * | 2014-12-25 | 2016-06-30 | 株式会社ジェイテクト | グリース組成物およびスプライン伸縮軸 |
JP2016121296A (ja) * | 2014-12-25 | 2016-07-07 | 株式会社ジェイテクト | グリース組成物およびスプライン伸縮軸 |
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JP7166068B2 (ja) | 2018-03-27 | 2022-11-07 | Ntn株式会社 | グリース封入転がり軸受 |
WO2020105702A1 (ja) * | 2018-11-21 | 2020-05-28 | 協同油脂株式会社 | 円すいころ軸受用グリース組成物 |
JP2020083994A (ja) * | 2018-11-21 | 2020-06-04 | 協同油脂株式会社 | 円すいころ軸受用グリース組成物 |
CN113166673A (zh) * | 2018-11-21 | 2021-07-23 | 协同油脂株式会社 | 圆锥滚子轴承用润滑脂组合物 |
JP7294796B2 (ja) | 2018-11-21 | 2023-06-20 | 協同油脂株式会社 | 円すいころ軸受用グリース組成物 |
Also Published As
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CN103097504B (zh) | 2014-06-18 |
EP2749631A4 (en) | 2014-07-23 |
US20140199009A1 (en) | 2014-07-17 |
EP2749631A1 (en) | 2014-07-02 |
JPWO2013031705A1 (ja) | 2015-03-23 |
CN103097504A (zh) | 2013-05-08 |
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