US20230416633A1 - Grease composition for constant-velocity joints - Google Patents
Grease composition for constant-velocity joints Download PDFInfo
- Publication number
- US20230416633A1 US20230416633A1 US18/252,723 US202018252723A US2023416633A1 US 20230416633 A1 US20230416633 A1 US 20230416633A1 US 202018252723 A US202018252723 A US 202018252723A US 2023416633 A1 US2023416633 A1 US 2023416633A1
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- United States
- Prior art keywords
- mass
- grease composition
- composition
- oil
- constant
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
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- 239000000203 mixture Substances 0.000 title claims abstract description 87
- 239000004519 grease Substances 0.000 title claims abstract description 51
- KHYKFSXXGRUKRE-UHFFFAOYSA-J molybdenum(4+) tetracarbamodithioate Chemical compound C(N)([S-])=S.[Mo+4].C(N)([S-])=S.C(N)([S-])=S.C(N)([S-])=S KHYKFSXXGRUKRE-UHFFFAOYSA-J 0.000 claims abstract description 31
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 29
- 239000002199 base oil Substances 0.000 claims abstract description 22
- 239000002562 thickening agent Substances 0.000 claims abstract description 18
- 239000011701 zinc Substances 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 15
- XMKLTEGSALONPH-UHFFFAOYSA-N 1,2,4,5-tetrazinane-3,6-dione Chemical compound O=C1NNC(=O)NN1 XMKLTEGSALONPH-UHFFFAOYSA-N 0.000 claims abstract description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 13
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- XYRMLECORMNZEY-UHFFFAOYSA-B [Mo+4].[Mo+4].[Mo+4].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S Chemical compound [Mo+4].[Mo+4].[Mo+4].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S XYRMLECORMNZEY-UHFFFAOYSA-B 0.000 claims abstract description 11
- 125000001931 aliphatic group Chemical group 0.000 claims description 8
- 230000001629 suppression Effects 0.000 abstract description 14
- -1 urea compound Chemical class 0.000 description 22
- 239000003921 oil Substances 0.000 description 19
- 235000019198 oils Nutrition 0.000 description 18
- 125000000217 alkyl group Chemical group 0.000 description 13
- 125000004432 carbon atom Chemical group C* 0.000 description 13
- 239000003963 antioxidant agent Substances 0.000 description 11
- 239000000654 additive Substances 0.000 description 9
- 230000003078 antioxidant effect Effects 0.000 description 9
- 239000002480 mineral oil Substances 0.000 description 9
- 235000010446 mineral oil Nutrition 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 5
- 125000003118 aryl group Chemical group 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010696 ester oil Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 150000003460 sulfonic acids Chemical class 0.000 description 3
- COGHWIKGZJHSAG-UHFFFAOYSA-L zinc;2,3-di(nonyl)naphthalene-1-sulfonate Chemical compound [Zn+2].C1=CC=C2C(S([O-])(=O)=O)=C(CCCCCCCCC)C(CCCCCCCCC)=CC2=C1.C1=CC=C2C(S([O-])(=O)=O)=C(CCCCCCCCC)C(CCCCCCCCC)=CC2=C1 COGHWIKGZJHSAG-UHFFFAOYSA-L 0.000 description 3
- DMBHHRLKUKUOEG-UHFFFAOYSA-N N-phenyl aniline Natural products C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920013639 polyalphaolefin Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 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 2
- YFMDXYVZWMHAHJ-UHFFFAOYSA-N 1-pentaphen-1-yloxypentaphene Chemical compound C1=CC=CC2=CC3=C(C=C4C(OC=5C6=CC7=C8C=C9C=CC=CC9=CC8=CC=C7C=C6C=CC=5)=CC=CC4=C4)C4=CC=C3C=C21 YFMDXYVZWMHAHJ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000005069 Extreme pressure additive Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- NCXUIEDQTCQZRK-UHFFFAOYSA-L disodium;decanedioate Chemical class [Na+].[Na+].[O-]C(=O)CCCCCCCCC([O-])=O NCXUIEDQTCQZRK-UHFFFAOYSA-L 0.000 description 1
- QFYNUCAKHMSPCY-UHFFFAOYSA-L disodium;nonanedioate Chemical class [Na+].[Na+].[O-]C(=O)CCCCCCCC([O-])=O QFYNUCAKHMSPCY-UHFFFAOYSA-L 0.000 description 1
- SDWYUQHONRZPMW-UHFFFAOYSA-L disodium;octanedioate Chemical class [Na+].[Na+].[O-]C(=O)CCCCCCC([O-])=O SDWYUQHONRZPMW-UHFFFAOYSA-L 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- CJMZLCRLBNZJQR-UHFFFAOYSA-N ethyl 2-amino-4-(4-fluorophenyl)thiophene-3-carboxylate Chemical compound CCOC(=O)C1=C(N)SC=C1C1=CC=C(F)C=C1 CJMZLCRLBNZJQR-UHFFFAOYSA-N 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000002608 ionic liquid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012170 montan wax Substances 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000008301 phosphite esters Chemical class 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- RYYWUUFWQRZTIU-UHFFFAOYSA-K thiophosphate Chemical compound [O-]P([O-])([O-])=S RYYWUUFWQRZTIU-UHFFFAOYSA-K 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 235000019871 vegetable fat Nutrition 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- MBBWTVUFIXOUBE-UHFFFAOYSA-L zinc;dicarbamodithioate Chemical compound [Zn+2].NC([S-])=S.NC([S-])=S MBBWTVUFIXOUBE-UHFFFAOYSA-L 0.000 description 1
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
- C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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
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- 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
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- 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
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/08—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium containing a sulfur-to-oxygen bond
- C10M135/10—Sulfonic acids or derivatives thereof
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- C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
- C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
- C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
- C10M135/18—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
-
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
- C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
- C10M137/04—Phosphate esters
- C10M137/10—Thio derivatives
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- C10M141/02—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic oxygen-containing compound
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M141/08—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
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- C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
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- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- 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
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- 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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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—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 containing hydroxy groups; Ethers thereof
- C10M2207/1285—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 containing hydroxy groups; Ethers thereof used as thickening agents
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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
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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
- C10M2219/046—Overbasedsulfonic acid salts
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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
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
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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
- 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
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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
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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
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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
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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
- C10N2030/52—Base number [TBN]
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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
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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
- 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
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
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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—Semi-solids; greasy
Definitions
- the present invention relates to a grease composition for constant-velocity joints.
- FF front-wheel-drive
- CO2 reduction vehicle environmental measures
- CVJ constant-velocity joints
- a plunging type constant-velocity joint rotates at angle, and internal parts of the joint perform complicated rolling and sliding motions. During these motions, the friction of the internal parts generates sliding resistance in the axial direction, and the sliding resistance, if large, may cause vibration and noise.
- Patent Literature 1 As greases with excellent vibration suppression performance, there have been 30 proposed a grease for constant-velocity joints (see Patent Literature 1) obtained by using a urea grease in combination with additives of molybdenum dithiocarbamate and molybdenum dithiophosphate or in combination with these organomolybdenum compounds mixed with zinc dithiophosphate; and a grease composition for constant-velocity joints comprising a base oil, a urea thickener, molybdenum dithiocarbamate, calcium sulfonate, and thiophosphate (see Patent Literature 2).
- a grease composition for constant-velocity joints comprising: a grease composed of a base oil and a urea compound thickener; and a mixture of molybdenum dialkyldithiocarbamate, at least one of molybdenum dialkyldithiophosphate and molybdenum diaryldithiophosphate, and ashless dithiocarbamate or zinc dithiocarbamate (see Patent Literature 3), and a grease composition for constant-velocity joints comprising a base oil, a diurea thickener, molybdenum dialkyldithiocarbamate sulfide, zinc sulfonate, a sulfur-phosphorus extreme pressure agent, and vegetable fat and oil (see Patent Literature 4).
- the present invention has an object to provide a grease composition excellent in durability even at high temperature and vibration suppression performance.
- a base oil usable in the composition of the present invention is not particularly limited and a mineral oil and/or a synthetic oil may be used.
- the synthetic oils include: synthetic hydrocarbon oils such as poly- ⁇ -olefin; phenyl ether oils such as pentaphenyl ether, tetraphenyl ether, monoalkyltetraphenyl ether, dialkyltetraphenyl ether, and alkyldiphenyl ether oils; alkylbenzene oils; ester oils such as monoester oils, diester oils, polyol ester oils, and aromatic ester oils; polyglycol oils; silicone oils; fluorine oils; ionic liquids, and the like.
- a mineral oil is preferably used from the viewpoint of cost.
- a base oil may be used in which a mineral oil as a main component is mixed with a synthetic oil.
- the base oil in the present invention is a mixture oil of a mineral oil and a synthetic oil
- the content of the mineral oil based on the total mass of the base oil is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and further preferably 90 to 100% by mass.
- the kinematic viscosity at 100° C. of the base oil in the present invention is preferably 5 to 30 mm 2 /s and more preferably 7 to 20 mm 2 /s.
- the kinematic viscosity is less than 5 mm 2 /s, the durability tends to be insufficient because no oil film is formed in a constant-velocity joint.
- the kinematic viscosity exceeds 30 mm 2 /s, the durability tends to decrease due to heat generation in the CVJ.
- the content of the base oil based on the total mass of the composition is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and further preferably 80 to 100% by mass.
- the diurea thickener usable in the present invention is expressed by the following formula (1).
- R 2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms.
- tolylene diisocyanate or diphenylmethane diisocyanate are preferable and diphenylmethane diisocyanate is more preferable.
- R 1 and R 3 which may be the same as or different from each other, are each a linear or branched alkyl group having 6 to 30 carbon atoms, an aryl group having 6 or 7 carbon atoms, or a cyclohexyl group.
- an aliphatic diurea compound in which both of R 1 and R 3 are alkyl groups having 6 to 30 carbon atoms may be obtained through a reaction of diisocyanate and aliphatic monoamine.
- an alicyclic aliphatic diurea compound in which one of R 1 and R 3 is an alkyl group having 6 to 30 carbon atoms and the other one is a cyclohexyl group is preferable. Since the alicyclic aliphatic diurea compound can be obtained through a reaction of diisocyanate with alicyclic monoamine and aliphatic monoamine, the alicyclic aliphatic diurea compound in fact is not only an alicyclic aliphatic diurea compound but also a mixture comprising an aliphatic diurea compound and an alicyclic diurea compound.
- any one of R 1 and R 3 is a cyclohexyl group
- the other one is preferably a linear alkyl group having 8 or 18 carbon atoms.
- a ratio of the cyclohexyl group to the total of the cyclohexyl group and the alkyl group is preferably 70 to 100 mol % and more preferably 80 to 100 mol % from the viewpoint of fluidity.
- an aliphatic diurea compound is preferable from the viewpoint of durability.
- a diurea compound in the formula (1) in which both of R 1 and R 3 are alkyl groups having 8 to 30 carbon atoms and R 2 is diphenylmethane diisocyanate.
- R 1 and R 3 are linear alkyl groups having 8 or 18 carbon atoms and R 2 is diphenylmethane diisocyanate.
- the consistency of the grease composition of the present invention is preferably 250 to 400, more preferably 280 to 370, and further preferably 310 to 340.
- the term “consistency” refers to a 60-stoke worked penetration. The consistency may be measured in accordance with JIS K2220 7.
- the content of the thickener based on the total mass of the composition is preferably 10% by mass or less, more preferably 5 to 10% by mass, and further preferably 6 to 7% by mass such that the consistency of the grease composition can be set within the above range.
- the molybdenum dithiocarbamate usable in the present invention is a general term for organometallic load bearing additives whose metal group is molybdenum, and is generally widely used as an extreme pressure additive.
- a preferred example of the molybdenum dithiocarbamate can be expressed by the following formula (2).
- the molybdenum dithiocarbamate includes oil-soluble molybdenum dithiocarbamate (that is, liquid at room temperature (about 25° C.)) and oil-insoluble molybdenum dithiocarbamate (that is, solid at room temperature).
- oil-soluble molybdenum dithiocarbamate that is, liquid at room temperature (about 25° C.)
- oil-insoluble molybdenum dithiocarbamate that is, solid at room temperature.
- any of them may be used, but a combination of an oil-soluble molybdenum dithiocarbamate and an oil-insoluble molybdenum dithiocarbamate is preferable because the resultant composition is excellent in durability and heat generation suppression and vibration suppression in the CSJ.
- the content of the component (b) based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and further preferably 1 to 3% by mass from the viewpoint of vibration suppression.
- the composition contains an oil-soluble molybdenum dithiocarbamate and an oil-insoluble molybdenum dithiocarbamate, it is preferable to use them in a mass ratio of the oil-soluble molybdenum dithiocarbamate to the oil-insoluble molybdenum dithiocarbamate of preferably 4:6 to 10:0 and more preferably 6:4 to 8:2 because the resultant composition is excellent in vibration suppression.
- a preferred example of the molybdenum dithiophosphate used in the present invention is expressed by the following formula (3).
- the content of the component (d) based on the total mass of the composition is preferably 0.1% by mass or more, more preferably 0.1 to 5% by mass, and further preferably 0.2 to 2% by mass from the viewpoint of durability.
- the overbased calcium sulfonate used in the present invention is a calcium sulfonate having a base number of 200 mgKOH/g or more.
- the base number is preferably 300 mgKOH/g or more and more preferably 300 to 500 mgKOH/g from the viewpoint of durability.
- the base number is a value measured in accordance with JIS K 2501.
- a calcium salt of a sulfonic acid having a lipophilic organic group can be used.
- organic sulfonic acids include: petroleum sulfonic acids obtained by sulfonation of aromatic hydrocarbon components in lubricating oil fractions; synthetic sulfonic acids such as dinonylnaphthalene sulfonic acid and heavy alkylbenzene sulfonic acid; and the like.
- calcium sulfonates overbased with calcium carbonate are preferable. Above all, an alkyl aromatic calcium sulfonate containing calcium carbonate is preferable.
- the content of the component (e) in the grease composition of the present invention based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 1.2 to 3.5% by mass from the viewpoint of durability.
- the neutral zinc sulfonate used in the present invention has a base number of 10 mgKOH/g or less.
- the sulfonic acid constituting the zinc sulfonate is the same as described for the component (e).
- neutral zinc sulfonate zinc dinonylnaphthalene sulfonate is preferable.
- the content of the neutral zinc sulfonate in the grease composition of the present invention based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and further preferably 0.8 to 3% by mass from the viewpoint of durability.
- the total content of the components (e) and (f) based on the total mass of the composition is preferably 0.5 to 5% by mass and more preferably 1 to 3% by mass because excellent heat resistance can be obtained.
- the grease composition of the present invention may comprise additives, which are commonly used in greases, as needed.
- the content of these additives based on the total mass of the grease composition is usually 0.1 to 5% by mass and preferably 0.5 to 3% by mass.
- antioxidants such as amine-based, phenol-based, quinoline-based, sulfur-based, and zinc dithiophosphate antioxidants
- rust preventives such as zinc-based, carboxylic acid-based, carboxylate-based (especially dibasic salts of sodium sebacate, sodium azelate, sodium suberate, and the like), and amine-based rust preventives
- anti-wear agents such as sulfurized oil and fat, sulfurized olefin, phosphate ester, phosphite ester, and acid phosphate amine salt
- oiliness agents such as fatty acid, fatty acid ester, and phosphate ester
- solid lubricants such as graphite, polytetrafluoroethylene (PTFE), and zinc oxide.
- the grease composition preferably comprises an antioxidant.
- an amine-based antioxidant is preferable and alkyl diphenylamine is more preferable.
- the content of the antioxidant based on the total mass of the composition is preferably 0.1% by mass or more, more preferably 0.1 to 2% by mass, and further preferably 0.2 to 1% by mass.
- composition of the present invention preferably comprises only:
- the contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- composition of the present invention preferably comprises:
- the contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- composition of the present invention preferably comprises:
- the contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- the grease composition of the present invention is applicable to constant-velocity joints.
- a grease composition in Comparative Example 5 was prepared in accordance with the description of Example C4 in Japanese Patent No. 6470851.
- the components used to prepare the grease compositions are as follows.
- a TE77 tester is a vibration friction wear tester under sliding conditions. It has been reported that there is a relationship between vibration caused by a constant-velocity joint as a vibration source and the friction coefficient measured with the TE77 tester under vibration conditions (Japanese Patent Application Publication No. 2010-065194). Therefore, the vibration suppression in a constant-velocity joint was evaluated by using the TE77 tester.
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- Chemical & Material Sciences (AREA)
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Abstract
Description
- The present invention relates to a grease composition for constant-velocity joints.
- Regarding automobiles, front-wheel-drive (FF) vehicles are widely used from the viewpoints of weight reduction for vehicle environmental measures (CO2 reduction) and securing of a living space, and constant-velocity joints (CVJ), which are essential for power transmission in FF vehicles, are widely used.
- Among CVJ type joints, a plunging type constant-velocity joint rotates at angle, and internal parts of the joint perform complicated rolling and sliding motions. During these motions, the friction of the internal parts generates sliding resistance in the axial direction, and the sliding resistance, if large, may cause vibration and noise.
- Along with a recent increase in the power output of automobile engines, a lubrication condition inside the constant-velocity joint has shifted to a high surface pressure condition. As the surface pressure as the lubrication condition becomes higher, wear tends to occur more easily inside the constant-velocity joint, which may cause problems such as deterioration of durability (anti-flaking property) and increase in vibration.
- In addition, such constant-velocity joints are also required to ensure the durability at high temperature.
- As greases with excellent vibration suppression performance, there have been 30 proposed a grease for constant-velocity joints (see Patent Literature 1) obtained by using a urea grease in combination with additives of molybdenum dithiocarbamate and molybdenum dithiophosphate or in combination with these organomolybdenum compounds mixed with zinc dithiophosphate; and a grease composition for constant-velocity joints comprising a base oil, a urea thickener, molybdenum dithiocarbamate, calcium sulfonate, and thiophosphate (see Patent Literature 2). In addition, in order to meet the recent demand for even more quietness, there have been also proposed a grease composition for constant-velocity joints comprising: a grease composed of a base oil and a urea compound thickener; and a mixture of molybdenum dialkyldithiocarbamate, at least one of molybdenum dialkyldithiophosphate and molybdenum diaryldithiophosphate, and ashless dithiocarbamate or zinc dithiocarbamate (see Patent Literature 3), and a grease composition for constant-velocity joints comprising a base oil, a diurea thickener, molybdenum dialkyldithiocarbamate sulfide, zinc sulfonate, a sulfur-phosphorus extreme pressure agent, and vegetable fat and oil (see Patent Literature 4).
- As a grease prepared also in consideration of durability, there has been proposed a composition for constant-velocity joints comprising a base oil, a thickener, montan wax, zinc sulfonate, and molybdenum dialkyldithiocarbamate sulfide (see Patent Literature 5).
- Thus, the grease compositions for constant-velocity joints in the related art have demonstrated excellent performance in vibration suppression, and their durability at room temperature has also been studied. On the other hand, however, it cannot be said that the problem of durability at high temperature has been sufficiently studied.
-
- Patent Literature 1: Japanese Examined Patent Application Publication No. H05-79280
- Patent Literature 2: Japanese Patent Application Publication No. H11-172276
- Patent Literature 3: Japanese Patent Application Publication No. 2009-235416
- Patent Literature 4: Japanese Patent Application Publication No. 2011-37950
- Patent Literature 5: International Publication No. WO2014/0954797
- Therefore, the present invention has an object to provide a grease composition excellent in durability even at high temperature and vibration suppression performance.
-
-
- 1. A grease composition for constant-velocity joints comprising:
- (a) a base oil;
- (b) a diurea thickener;
- (c) molybdenum dithiocarbamate;
- (d) molybdenum dithiophosphate;
- (e) overbased calcium sulfonate; and
- (f) neutral zinc sulfonate.
- 2. The grease composition according to claim 1, wherein a content of the component (f) is 0.1 to 10% by mass based on the total mass of the composition.
- 3. The grease composition according to claim 1 or 2, wherein a content of the component (f) is 0.5 to 5% by mass based on the total mass of the composition.
- 4. The grease composition according to any one of claims 1 to 3, wherein a content of the component (f) is 0.8 to 3% by mass based on the total mass of the composition.
- 5. The grease composition according to any one of claims 1 to 4, wherein a content of the component (e) is 0.1 to 10% by mass based on the total mass of the composition.
- 6. The grease composition according to any one of claims 1 to 5, wherein a content of the component (e) is 0.2 to 5% by mass based on the total mass of the composition.
- 7. The grease composition according to any one of claims 1 to 6, wherein a content of the component (e) is 1.2 to 3.5% by mass based on the total mass of the composition.
- 8. The grease composition according to any one of claims 1 to 7, wherein the component (b) is an aliphatic diurea thickener.
- 9. A constant-velocity joint in which the grease composition according to any one of claims 1 to 8 is enclosed.
- 1. A grease composition for constant-velocity joints comprising:
- According to the present invention, it is possible to provide a grease composition excellent in durability even at high temperature and also excellent in vibration suppression.
- A base oil usable in the composition of the present invention is not particularly limited and a mineral oil and/or a synthetic oil may be used. The synthetic oils include: synthetic hydrocarbon oils such as poly-α-olefin; phenyl ether oils such as pentaphenyl ether, tetraphenyl ether, monoalkyltetraphenyl ether, dialkyltetraphenyl ether, and alkyldiphenyl ether oils; alkylbenzene oils; ester oils such as monoester oils, diester oils, polyol ester oils, and aromatic ester oils; polyglycol oils; silicone oils; fluorine oils; ionic liquids, and the like.
- As the base oil in the present invention, a mineral oil is preferably used from the viewpoint of cost. A base oil may be used in which a mineral oil as a main component is mixed with a synthetic oil.
- In the case where the base oil in the present invention is a mixture oil of a mineral oil and a synthetic oil, the content of the mineral oil based on the total mass of the base oil is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and further preferably 90 to 100% by mass.
- The kinematic viscosity at 100° C. of the base oil in the present invention is preferably 5 to 30 mm2/s and more preferably 7 to 20 mm2/s. When the kinematic viscosity is less than 5 mm2/s, the durability tends to be insufficient because no oil film is formed in a constant-velocity joint. When the kinematic viscosity exceeds 30 mm2/s, the durability tends to decrease due to heat generation in the CVJ.
- From the viewpoint of the fluidity, the content of the base oil based on the total mass of the composition is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, and further preferably 80 to 100% by mass.
- The diurea thickener usable in the present invention is expressed by the following formula (1).
-
R1—NHCONH—R2—NHCONH—R3 (1) - In the formula, R2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms. As R2, tolylene diisocyanate or diphenylmethane diisocyanate are preferable and diphenylmethane diisocyanate is more preferable. R1 and R3, which may be the same as or different from each other, are each a linear or branched alkyl group having 6 to 30 carbon atoms, an aryl group having 6 or 7 carbon atoms, or a cyclohexyl group.
- As the diurea compound in the formula (1), an aliphatic diurea compound in which both of R1 and R3 are alkyl groups having 6 to 30 carbon atoms. The aliphatic diurea compound may be obtained through a reaction of diisocyanate and aliphatic monoamine.
- In addition, as the diurea compound in the formula (1), an alicyclic aliphatic diurea compound in which one of R1 and R3 is an alkyl group having 6 to 30 carbon atoms and the other one is a cyclohexyl group is preferable. Since the alicyclic aliphatic diurea compound can be obtained through a reaction of diisocyanate with alicyclic monoamine and aliphatic monoamine, the alicyclic aliphatic diurea compound in fact is not only an alicyclic aliphatic diurea compound but also a mixture comprising an aliphatic diurea compound and an alicyclic diurea compound.
- In the case where any one of R1 and R3 is a cyclohexyl group, the other one is preferably a linear alkyl group having 8 or 18 carbon atoms. In this compound, a ratio of the cyclohexyl group to the total of the cyclohexyl group and the alkyl group is preferably 70 to 100 mol % and more preferably 80 to 100 mol % from the viewpoint of fluidity.
- As the thickener in the present invention, an aliphatic diurea compound is preferable from the viewpoint of durability.
- In particular, preferred is a diurea compound in the formula (1) in which both of R1 and R3 are alkyl groups having 8 to 30 carbon atoms and R2 is diphenylmethane diisocyanate.
- Above all, preferred is a diurea compound in the formula (1) in which both of R1 and R3 are linear alkyl groups having 8 or 18 carbon atoms and R2 is diphenylmethane diisocyanate.
- The consistency of the grease composition of the present invention is preferably 250 to 400, more preferably 280 to 370, and further preferably 310 to 340. In the present specification, the term “consistency” refers to a 60-stoke worked penetration. The consistency may be measured in accordance with JIS K2220 7.
- The content of the thickener based on the total mass of the composition is preferably 10% by mass or less, more preferably 5 to 10% by mass, and further preferably 6 to 7% by mass such that the consistency of the grease composition can be set within the above range.
- The molybdenum dithiocarbamate usable in the present invention is a general term for organometallic load bearing additives whose metal group is molybdenum, and is generally widely used as an extreme pressure additive. A preferred example of the molybdenum dithiocarbamate can be expressed by the following formula (2).
-
[R4R5N—CS—S]2—Mo2OmSm (2) - In the formula, R4 and R5, which may be the same as or different from each other, are each independently a liner or branched alkyl group having 1 to 24 carbon atoms or preferably 3 to 18 carbon atoms, m is 0 to 3, n is 4 to 1, and m+n=4.
- The molybdenum dithiocarbamate includes oil-soluble molybdenum dithiocarbamate (that is, liquid at room temperature (about 25° C.)) and oil-insoluble molybdenum dithiocarbamate (that is, solid at room temperature). As the molybdenum dithiocarbamate in the present invention, any of them may be used, but a combination of an oil-soluble molybdenum dithiocarbamate and an oil-insoluble molybdenum dithiocarbamate is preferable because the resultant composition is excellent in durability and heat generation suppression and vibration suppression in the CSJ.
- In the grease composition of the present invention, the content of the component (b) based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and further preferably 1 to 3% by mass from the viewpoint of vibration suppression. In the case where the composition contains an oil-soluble molybdenum dithiocarbamate and an oil-insoluble molybdenum dithiocarbamate, it is preferable to use them in a mass ratio of the oil-soluble molybdenum dithiocarbamate to the oil-insoluble molybdenum dithiocarbamate of preferably 4:6 to 10:0 and more preferably 6:4 to 8:2 because the resultant composition is excellent in vibration suppression.
- A preferred example of the molybdenum dithiophosphate used in the present invention is expressed by the following formula (3).
-
[(R6O)(R7O)PS—S]2MO2OmSn - (In the formula, R6 and R7 are each independently an alkyl group having 1 to 24 carbon atoms or an aryl group having 6 to 30 carbon atoms, m is 0 to 3, n is 4 to 1, and m+n=4.)
- In the grease composition of the present invention, the content of the component (d) based on the total mass of the composition is preferably 0.1% by mass or more, more preferably 0.1 to 5% by mass, and further preferably 0.2 to 2% by mass from the viewpoint of durability.
- The overbased calcium sulfonate used in the present invention is a calcium sulfonate having a base number of 200 mgKOH/g or more. The base number is preferably 300 mgKOH/g or more and more preferably 300 to 500 mgKOH/g from the viewpoint of durability. In the present invention, the base number is a value measured in accordance with JIS K 2501.
- As the component (e), a calcium salt of a sulfonic acid having a lipophilic organic group can be used. Such organic sulfonic acids include: petroleum sulfonic acids obtained by sulfonation of aromatic hydrocarbon components in lubricating oil fractions; synthetic sulfonic acids such as dinonylnaphthalene sulfonic acid and heavy alkylbenzene sulfonic acid; and the like. As the component (e), calcium sulfonates overbased with calcium carbonate are preferable. Above all, an alkyl aromatic calcium sulfonate containing calcium carbonate is preferable.
- The content of the component (e) in the grease composition of the present invention based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and further preferably 1.2 to 3.5% by mass from the viewpoint of durability.
- The neutral zinc sulfonate used in the present invention has a base number of 10 mgKOH/g or less.
- The sulfonic acid constituting the zinc sulfonate is the same as described for the component (e).
- As the neutral zinc sulfonate, zinc dinonylnaphthalene sulfonate is preferable.
- The content of the neutral zinc sulfonate in the grease composition of the present invention based on the total mass of the composition is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and further preferably 0.8 to 3% by mass from the viewpoint of durability.
- The total content of the components (e) and (f) based on the total mass of the composition is preferably 0.5 to 5% by mass and more preferably 1 to 3% by mass because excellent heat resistance can be obtained.
- The mass ratio of the component (e) to the component (f) is preferably (e):(f)=9:1 to 1:9 because excellent durability can be obtained. The mass ratio is more preferably (e):(f)=8:2 to 3:7 and further preferably (e):(f)=7:3 to 4:6. In particular, it is preferable that the total content of the components (e) and (f) based on the total mass of the composition be 1 to 3% by mass and the mass ratio of the component (e) to the component (f) be (e):(f)=7:3 to 4:6, because excellent durability and heat resistance can be obtained.
- The grease composition of the present invention may comprise additives, which are commonly used in greases, as needed. The content of these additives based on the total mass of the grease composition is usually 0.1 to 5% by mass and preferably 0.5 to 3% by mass.
- Examples of these additives include: antioxidants such as amine-based, phenol-based, quinoline-based, sulfur-based, and zinc dithiophosphate antioxidants; rust preventives such as zinc-based, carboxylic acid-based, carboxylate-based (especially dibasic salts of sodium sebacate, sodium azelate, sodium suberate, and the like), and amine-based rust preventives; anti-wear agents such as sulfurized oil and fat, sulfurized olefin, phosphate ester, phosphite ester, and acid phosphate amine salt; oiliness agents such as fatty acid, fatty acid ester, and phosphate ester; and solid lubricants such as graphite, polytetrafluoroethylene (PTFE), and zinc oxide.
- From the viewpoint of heat resistance, the grease composition preferably comprises an antioxidant.
- As the antioxidant, an amine-based antioxidant is preferable and alkyl diphenylamine is more preferable. The content of the antioxidant based on the total mass of the composition is preferably 0.1% by mass or more, more preferably 0.1 to 2% by mass, and further preferably 0.2 to 1% by mass.
- The composition of the present invention preferably comprises only:
-
- (a) a base oil;
- (b) a diurea thickener;
- (c) molybdenum dithiocarbamate;
- (d) molybdenum dithiophosphate;
- (e) overbased calcium sulfonate;
- (f) neutral zinc sulfonate; and
- (g) an antioxidant.
- The contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- Alternatively, the composition of the present invention preferably comprises:
-
- (a) a base oil;
- (b) an aliphatic diurea thickener;
- (c) molybdenum dithiocarbamate;
- (d) molybdenum dithiophosphate;
- (e) overbased calcium sulfonate containing calcium carbonate and having a base number of 300 mgKOH/g or more;
- (f) neutral zinc sulfonate; and
- (g) an amine-based antioxidant.
- The contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- Instead, the composition of the present invention preferably comprises:
-
- (a) a base oil;
- (b) an aliphatic diurea thickener in the above formula (1) in which R1 and R3 are both linear alkyl groups having 8 carbon atoms and R2 is diphenylmethane diisocyanate;
- (c) a mixture of oil-soluble molybdenum dithiocarbamate and oil-insoluble molybdenum dithiocarbamate;
- (d) molybdenum dithiophosphate;
- (e) alkyl aromatic calcium sulfonate containing calcium carbonate and having a base number of 300 to 500 mgKOH/g;
- (f) zinc dinonylnaphthalene sulfonate having a base number of 10 mgKOH/g or less; and
- (g) alkyl diphenylamine.
- The contents of the components in the above composition based on the total mass of the composition preferably are: (a) 80 to 100% by mass, (b) 6 to 7% by mass, (c) 1 to 3% by mass, (d) 0.2 to 2% by mass, (e) 0.5 to 3% by mass, (f) 0.8 to 3% by mass, and (g) 0.2 to 1% by mass.
- The grease composition of the present invention is applicable to constant-velocity joints. In particular, it is preferable to apply the grease composition to plunging type constant-velocity joints, especially tripod type constant-velocity joints, and double offset type constant-velocity joints, especially inboard side constant-velocity joints, because the grease composition is excellent in durability and vibration suppression.
- In a base oil, 1 mol of 4′,4-diphenylmethane diisocyanate and 2 mol of octylamine were reacted, followed by heating and cooling. Thereafter, additives were blended in the ratio specified in Table 1 or 2, and the resultant mixture was kneaded in a three-roll mill to produce a grease composition with a worked penetration of 315. The numerical values in Tables 1 and 2 specify % by mass based on the total mass of the grease composition, unless otherwise specified.
- A grease composition in Comparative Example 5 was prepared in accordance with the description of Example C4 in Japanese Patent No. 6470851.
- The components used to prepare the grease compositions are as follows.
-
-
- Mineral oil (kinematic viscosity at 100° C.: 12.4 mm2/s)
- Mineral oil+Synthetic oil: poly-α-olefin (kinematic viscosity at 100° C.: 12.0 mm2/s)
-
-
- MoDTC (oil-insoluble): molybdenum dithiocarbamate (ADEKA SAKURA-LUBE 600, manufactured by Adeka Corporation)
- MoDTC (oil-insoluble): molybdenum dithiocarbamate (Molyvan A, manufactured by Vanderbilt, used in Comparative Example 5)
- MoDTC (oil soluble): molybdenum dithiocarbamate (ADEKA SAKURA-LUBE 525, manufactured by Adeka Corporation)
- MoDTP: Molybdenum dithiophosphate (ADEKA SAKURA-LUBE 300, manufactured by Adeka Corporation)
- MoDTP: Molybdenum dithiophosphate (Molyvan L, manufactured by Vanderbilt, used in Comparative Example 5)
- Ca sulfonate (overbased): calcium salt of alkyl aromatic sulfonic acid (LUBRIZOL 5283C, manufactured by The Lubrizol Corporation, base number 375 mgKOH/g)
- Zn sulfonate (neutral): zinc dinonylnaphthalene sulfonate (NA-SUL ZS, manufactured by KING INDUSTRIES, base number 5 mgKOH/g)
- Antioxidant
-
-
- Test speed: 11.9 mm/s (frequency: 3.3 Hz, stroke: 1.8 mm)
- Test temperature: 90° C.
- Load: 5.5 GPa
- Specimen: Ball (diameter 17.5 mm, SUJ-2)/plate (SUJ-2, surface roughness Rz 0.5 μm)
[Evaluation criteria] - ⊚ (Pass): Friction coefficient of 0.08 or less
- ◯ (Pass): Friction coefficient of more than 0.08 to 0.10 or less
- Δ (Pass): Friction coefficient of more than 0.10 to 0.12 or less
- X (Failure): Occurrence of seizure or friction coefficient of more than 0.12
-
-
- Test speed: 2.0 mm/s (frequency: 3.3 Hz, stroke: 0.3 mm)
- Test temperature: 95° C.
- Load: 2.1 GPa
- Specimen: Ball (diameter 17.5 mm, SUJ-2)/plate (SUJ-2, surface roughness Rz 5 μm)
-
-
- ◯ (Pass): Friction coefficient of 0.10 or less
- Δ (Pass): Friction coefficient of more than 0.10 to 0.14 or less
- X (Failure): Occurrence of seizure or friction coefficient of more than 0.14
- A TE77 tester is a vibration friction wear tester under sliding conditions. It has been reported that there is a relationship between vibration caused by a constant-velocity joint as a vibration source and the friction coefficient measured with the TE77 tester under vibration conditions (Japanese Patent Application Publication No. 2010-065194). Therefore, the vibration suppression in a constant-velocity joint was evaluated by using the TE77 tester.
-
-
- Test speed: 16 mm/s (frequency: 10 Hz, stroke: 0.8 mm)
- Test temperature: 40° C.
- Load: 1.2 GPa
- Specimen: Ball (17.5 mm diameter, SUJ-2)/Plate (SCM)
-
-
- ◯ (Pass): Friction coefficient of 0.07 or less
- Δ (Pass): Friction coefficient of more than 0.07 to 0.10 or less
- X (Failure): Friction coefficient of more than 0.10
-
-
- ◯ (Pass): The grease composition passed in all of the above test results.
- X (Failure): The grease composition failed in one or more of the above test results.
- The results are shown in Tables 1 and 2.
-
TABLE 1 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 (b) Thickener Aliphatic Diurea 6.0 6.0 6.0 6.0 6.0 6.0 6.0 (a) Base Oil Mineral Oil Balance Balance Balance Balance Balance Balance Balance Kinematic Viscosity 12.4 12.4 12.4 12.4 12.4 12.4 12.4 (mm2/s @100° C.) Additives (c) MoDTC Oil-Insoluble 0.8 0.8 0.8 0.8 0.8 0.8 — Oil-Soluble 1.8 1.8 1.8 1.8 1.8 1.8 2.3 (d) MoDTP 0.5 0.5 0.5 0.5 0.5 0.5 0.5 (e) Ca Sulfonate Overbased 1.6 3.2 1.1 0.9 1.6 0.2 1.6 (f) Zn Sulfonate Neutral 1.0 2.8 1.0 0.8 0.6 1.0 1.0 Antioxidant 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Comprehensive Evaluation ◯ ◯ ◯ ◯ ◯ ◯ ◯ Durability SRV Test @High Load ⊚ ⊚ ⊚ ◯ ◯ ⊚ ◯ SRV Test @Low Load ◯ ◯ ◯ ◯ Δ Δ ◯ Vibration TE77 Test ◯ ◯ Δ Δ Δ Δ ◯ Suppression -
TABLE 2 Comp. Ex. 1 Comp. Ex. 2 Comp. Ex. 3 Comp. Ex. 4 Comp. Ex. 5 (b) Thickener Aliphatic Diurea 6.0 6.0 6.0 6.0 — Li-OHSt — — — — 6.0 (a) Base Oil Mineral Oil Balance Balance Balance Balance Balance Synthetic Oil — — — — Kinematic Viscosity 12.4 12.4 12.4 12.4 12.0 (mm2/s @100° C.) Additives (c) MoDTC Oil-Insoluble 0.8 0.8 — 0.8 1.5 Oil-Soluble 1.8 1.8 — 1.8 — (d) MoDTP 0.5 0.5 0.5 — 0.5 (e) Ca Sulfonate Overbased — 1.1 1.6 1.6 — (f) Zn Sulfonate Neutral 1.0 — 1.0 1.0 3.0 Antioxidant 0.5 0.5 0.5 0.5 0.3 Comprehensive Evaluation X X X X X Durability SRV Test @High Load X Δ X X X SRV Test @Low Load Δ X Δ ◯ X Vibration TE77 Test Δ X Δ Δ X Suppression
Claims (9)
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US (1) | US20230416633A1 (en) |
EP (1) | EP4253507A4 (en) |
JP (1) | JPWO2022113239A1 (en) |
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Family Cites Families (14)
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JPS6346299A (en) | 1986-01-16 | 1988-02-27 | Ntn Toyo Bearing Co Ltd | Grease for constant speed joint |
JPH0579280A (en) | 1991-09-19 | 1993-03-30 | Kajima Corp | Tail clearance measuring device for shieled excavating machine |
JP4397977B2 (en) | 1997-12-10 | 2010-01-13 | 協同油脂株式会社 | Grease composition for constant velocity joints |
JP4102627B2 (en) * | 2002-09-13 | 2008-06-18 | 株式会社ジェイテクト | Rolling bearing |
TW200624549A (en) * | 2004-11-08 | 2006-07-16 | Thk Co Ltd | Grease composition conforming to vibration and guide employing the same |
JP5379343B2 (en) * | 2006-05-10 | 2013-12-25 | 昭和シェル石油株式会社 | Grease composition for constant velocity joints |
JP5344422B2 (en) * | 2008-09-12 | 2013-11-20 | 協同油脂株式会社 | Grease composition for constant velocity joint and constant velocity joint |
JP5113807B2 (en) | 2009-06-19 | 2013-01-09 | 昭和シェル石油株式会社 | Grease composition for constant velocity joints |
JP5028701B2 (en) | 2009-08-07 | 2012-09-19 | 協同油脂株式会社 | Grease composition for constant velocity joint and constant velocity joint |
US9567548B2 (en) | 2012-10-05 | 2017-02-14 | Kyodo Yushi Co., Ltd. | Grease composition |
JP5641487B2 (en) * | 2012-12-21 | 2014-12-17 | 協同油脂株式会社 | Grease composition |
CN107532103B (en) | 2015-03-31 | 2020-03-31 | Gkn动力传动系统国际有限责任公司 | Grease composition for constant velocity universal joint |
JP5807833B1 (en) * | 2015-05-16 | 2015-11-10 | 有限会社タービュランス・リミテッド | Lubricating oil additive and lubricating oil composition |
JP6841595B2 (en) * | 2015-12-25 | 2021-03-10 | 協同油脂株式会社 | Lubricant composition for reducer and reducer |
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