JP6605367B2 - Grease composition for constant velocity joint and constant velocity joint - Google Patents
Grease composition for constant velocity joint and constant velocity joint Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/06—Mixtures of thickeners and additives
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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
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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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
- 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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- 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
- 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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- 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
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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
- C10M2219/06—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
- 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
- C10N2030/68—Shear stability
-
- 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
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- General Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Lubricants (AREA)
Description
本発明は、等速ジョイント用グリース組成物及び等速ジョイントに関する。 The present invention relates to a grease composition for a constant velocity joint and a constant velocity joint.
有機銅系化合物と有機モリブデン化合物もしくは有機亜鉛系化合物または両者を併用することによりグリースの摩擦係数が低下し、誘起スラスト(軸力)を低減することが可能であることが報告されている（特許文献１）。 It has been reported that the use of an organic copper compound and an organomolybdenum compound or an organozinc compound or both can reduce the friction coefficient of grease and reduce induced thrust (axial force) (patent) Reference 1).
しかし、ジョイント内でグリースが熱やせん断によるダメージを受けることで初期の摩擦特性が経時的に低下しスティックスリップ現象が発生してしまう。スティックスリップは、摺動面が起動し始めに引っ掛かりを起こす現象を指す。摺動面の停止中は理論上油膜厚さがゼロになってしまうため、起動し始めにこの現象が起こる。
したがって、本発明が解決しようとする課題は、熱やせん断を受けても初期と変わらぬ摩擦特性を維持することにより、耐スティックスリップ特性を維持する等速ジョイント用グリース組成物を提供することである。
However, when the grease is damaged by heat and shear in the joint, the initial frictional characteristics are deteriorated with time, and a stick-slip phenomenon occurs. Stick-slip refers to a phenomenon in which a sliding surface is caught at the start of activation. Since the oil film thickness theoretically becomes zero while the sliding surface is stopped, this phenomenon occurs at the start of starting.
Therefore, the problem to be solved by the present invention is to provide a grease composition for a constant velocity joint that maintains the stick-slip resistance by maintaining the same friction characteristics as the initial state even when subjected to heat or shear. is there.
本発明者らは、ジチオカルバミン酸モリブデンの構造、具体的には炭素鎖の鎖長及び常温での状態、およびグリース組成物に対する含有量を最適化することにより、上記課題を解決できることを見出し、本発明を完成した。すなわち、本発明により、以下のグリース組成物を提供する：
１．増ちょう剤、基油、添加剤として有機モリブデン系化合物を含有する等速ジョイント用グリース組成物であって、
基油が鉱油を含み、
増ちょう剤が下記式（１）で表されるジウレア化合物であり、
Ｒ１−ＮＨＣＯＮＨ−Ｒ２−ＮＨＣＯＮＨ−Ｒ３ （１）
（式（１）中、Ｒ２は炭素数６〜１５の２価の芳香族炭化水素基であり、Ｒ１及びＲ３は、互いに同一でも異なっていてもよく、炭素数６又は７のアリール基又はシクロヘキシル基である。）
有機モリブデン系化合物が下記式（２）で表され、２５℃で液体であるジチオカルバミン酸モリブデンであり、及び
[Ｒ3Ｒ4Ｎ−ＣＳ−Ｓ]2−Ｍｏ2ＯmＳn （２）
（式（２）中、Ｒ3，Ｒ4は、互いに同一でも異なっていても良く、それぞれ炭素数が１１〜２０の直鎖又は分岐アルキル基である。ｍは０〜３、ｎは１〜４であり、ｍ＋ｎ＝４である。）
前記組成物が、組成物の全質量を基準として、有機モリブデン系化合物を４〜１０質量％含有する、前記グリース組成物。
２．前記基油の４０℃における動粘度が１００〜１５０ｍｍ2／ｓである、前記１項記載の等速ジョイント用グリース組成物。
３．添加剤としてさらに有機スルホン酸金属塩および硫化油脂を含む、前記１又は２項記載の等速ジョイント用グリース組成物。
４．有機スルホン酸金属塩がカルシウム塩である、前記３項記載の等速ジョイント用グリース組成物。
５．前記１〜４のいずれか１項記載のグリース組成物を封入した、等速ジョイント。
The present inventors have found that the above problems can be solved by optimizing the structure of molybdenum dithiocarbamate, specifically the chain length of the carbon chain and the state at room temperature, and the content of the grease composition. Completed the invention. That is, according to the present invention, the following grease composition is provided:
1. A grease composition for constant velocity joints containing an organic molybdenum compound as a thickener, base oil, and additive,
The base oil contains mineral oil,
The thickener is a diurea compound represented by the following formula (1),
R1-NHCONH-R2-NHCONH-R3 (1)
(In the formula (1), R2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 may be the same as or different from each other, and are an aryl group or cyclohexyl having 6 or 7 carbon atoms. Group.)
The organomolybdenum compound is represented by the following formula (2), and is a molybdenum dithiocarbamate that is liquid at 25 ° C .; and
[R 3 R 4 N-CS -S] 2 -Mo 2 O m S n (2)
(In the formula (2), R 3, R 4 may be the same or different from each other, each carbon number of straight-chain or branched alkyl group having 11 to 20 .m is 0 to 3, n is 1 to 4 and m + n = 4.)
The said grease composition contains the organic molybdenum type compound 4-10 mass% on the basis of the total mass of a composition.
2. 2. The grease composition for constant velocity joints according to 1 above, wherein the base oil has a kinematic viscosity at 40 ° C. of 100 to 150 mm 2 / s.
3. 3. The grease composition for constant velocity joints according to 1 or 2 above, further comprising an organic sulfonic acid metal salt and a sulfurized fat / oil as additives.
4). 4. The grease composition for constant velocity joints according to 3 above, wherein the organic sulfonic acid metal salt is a calcium salt.
5. The constant velocity joint which enclosed the grease composition of any one of said 1-4.
本発明によれば、熱やせん断を受けてもグリース組成物の摩擦特性を維持することにより、耐スティックスリップ特性を維持することが可能である。本発明のグリース組成物はまた、耐摩耗性にも優れる。 According to the present invention, the stick-slip resistance can be maintained by maintaining the friction characteristics of the grease composition even when subjected to heat or shear. The grease composition of the present invention is also excellent in wear resistance.
＜増ちょう剤＞
本発明のグリース組成物に使用される増ちょう剤は、下記式（１）で表されるジウレア化合物である。
Ｒ１−ＮＨＣＯＮＨ−Ｒ２−ＮＨＣＯＮＨ−Ｒ３ （１）
式中、Ｒ２は炭素数６〜１５の２価の芳香族炭化水素基である。式中、Ｒ１及びＲ３は、互いに同一でも異なっていてもよく、炭素数６又は７のアリール基又はシクロヘキシル基である。
式（１）のジウレア化合物は、例えば、基油中で、所定のジイソシアネートと、所定のモノアミンとを反応させることにより得ることができる。ジイソシアネートの好ましい具体例は、ジフェニルメタン−４，４’−ジイソシアネート、トリレンジイソシアネートである。モノアミンとしては、炭素数６又は７の芳香族アミン、炭素数６又は７の脂環式アミン又はこれらの混合物が挙げられる。芳香族アミンの具体例としては、アニリン、ｐ−トルイジン及びナフチルアミン等が挙げられる。脂環式アミンの具体例としては、シクロヘキシルアミン、ジシクロヘキシルアミン等が挙げられる。このうち、ジフェニルメタン−４，４’−ジイソシアネートと、アニリン及びシクロヘキシルアミンとの反応生成物がとりわけ好ましい。この反応生成物は、以下の式で表される３つの化合物の混合物である。
<Thickener>
The thickener used in the grease composition of the present invention is a diurea compound represented 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. In the formula, R 1 and R 3 may be the same as or different from each other, and are an aryl group or a cyclohexyl group having 6 or 7 carbon atoms.
The diurea compound of the formula (1) can be obtained, for example, by reacting a predetermined diisocyanate with a predetermined monoamine in a base oil. Preferred specific examples of the diisocyanate are diphenylmethane-4,4′-diisocyanate and tolylene diisocyanate. Examples of monoamines include aromatic amines having 6 or 7 carbon atoms, alicyclic amines having 6 or 7 carbon atoms, or mixtures thereof. Specific examples of the aromatic amine include aniline, p-toluidine and naphthylamine. Specific examples of the alicyclic amine include cyclohexylamine and dicyclohexylamine. Of these, the reaction product of diphenylmethane-4,4′-diisocyanate with aniline and cyclohexylamine is particularly preferred. This reaction product is a mixture of three compounds represented by the following formula.
本発明のグリース組成物中の増ちょう剤の含有量は、好ましくは１０〜２５質量％、より好ましくは１０〜２０質量％である。本発明のグリース組成物の混和ちょう度は、２５０〜４００が好適であり、２５０〜３５０がより好ましい。
The content of the thickener in the grease composition of the present invention is preferably 10 to 25% by mass, more preferably 10 to 20% by mass. The blending degree of the grease composition of the present invention is preferably 250 to 400, more preferably 250 to 350.
＜基油＞
本発明のグリース組成物に使用される基油は、鉱油を含むこと以外、特に限定されない。基油は、単独で用いてもよく、二種以上を併用してもよい。
鉱油としては、パラフィン系鉱油、ナフテン系鉱油、これらの混合物を使用することができる。このうち、パラフィン系鉱油が好ましい。
合成油としては、ジエステル、ポリオールエステルに代表されるエステル系合成油；ポリα オレフィン、ポリブテンに代表される合成炭化水素油；アルキルジフェニルエーテル、ポリプロピレングリコールに代表されるエーテル系合成油；シリコーン油、フッ素化油など各種合成油が使用できる。
基油としては、鉱油が好ましい。とりわけパラフィン系鉱油が好ましい。
本発明における基油の動粘度は特に限定されない。必要に応じて基油動粘度を選定することができる。４０℃の基油動粘度が５０〜５００ｍｍ2／ｓであるのが好ましく、５０〜３００ｍｍ2／ｓであるのがより好ましく、１００〜１５０ｍｍ2／ｓであるのがさらに好ましい。
本発明のグリース組成物中の基油の含有量は、５０〜９５質量％が好ましく、６０〜９０質量％がより好ましい。
<Base oil>
The base oil used in the grease composition of the present invention is not particularly limited except that it contains mineral oil. A base oil may be used independently and may use 2 or more types together.
As mineral oils, paraffinic mineral oils, naphthenic mineral oils, and mixtures thereof can be used. Of these, paraffinic mineral oil is preferred.
Synthetic oils include ester-based synthetic oils typified by diesters and polyol esters; synthetic hydrocarbon oils typified by polyalphaolefins and polybutenes; ether-based synthetic oils typified by alkyl diphenyl ethers and polypropylene glycols; silicone oils, fluorine Various synthetic oils such as chemical oils can be used.
As the base oil, mineral oil is preferable. Paraffinic mineral oil is particularly preferable.
The kinematic viscosity of the base oil in the present invention is not particularly limited. The base oil kinematic viscosity can be selected as necessary. Is preferably a base oil kinematic viscosity of 40 ° C. is 50 to 500 mm 2 / s, more preferably from 50 to 300 mm 2 / s, even more preferably 100 to 150 mm 2 / s.
The content of the base oil in the grease composition of the present invention is preferably 50 to 95% by mass, and more preferably 60 to 90% by mass.
＜添加剤＞
有機モリブデン系化合物は、下記式（２）で表されるジチオカルバミン酸モリブデンであって、２５℃で液体である。
[Ｒ3Ｒ4Ｎ−ＣＳ−Ｓ]2−Ｍｏ2ＯmＳn （２）
式中、Ｒ3，Ｒ4は、互いに同一でも異なっていても良く、それぞれ炭素数が１１〜２０の直鎖又は分岐アルキル基、好ましくは炭素数１１〜１８の直鎖又は分岐アルキル基であり、より好ましくは炭素数１１〜１５の直鎖又は分岐アルキル基である。ｍは０〜３、ｎは１〜４であり、ｍ＋ｎ＝４である。ジチオカルバミン酸モリブデンは一般的に、分解反応により反応被膜を形成し、その被膜が摺動部材同士の接触を防ぐところ、炭素数が本発明で規定する範囲内であれば、分解反応速度が緩やかであり、換言すれば、ジチオカルバミン酸モリブデンの消費速度が遅いため、反応膜を摺動部材表面に適度に形成することが可能となることから、長期間使用しても摩擦特性を維持することができる。一方、炭素数が１１未満の場合、分解反応速度（つまり、反応膜形成の速度）が速く、ジチオカルバミン酸モリブデンの消費速度が速く、満足のいく反応膜を形成できなかったり、長時間摩擦特性を維持することができなくなったりする。また固体のジチオカルバミン酸モリブデンの場合、熱やせん断を受けるとグリース組成物の摩擦特性を維持することができなくなる。これは、熱やせん断により粒径が変化し、摺動部品の金属表面に形成される反応膜が変化したためと推測される。一方、液体のジチオカルバミン酸モリブデンの場合、熱やせん断により粒径が変化しないため、摺動部品の金属表面に形成される反応膜が変化しにくく、グリース組成物の摩擦特性を維持することができる。
<Additives>
The organomolybdenum compound is molybdenum dithiocarbamate represented by the following formula (2) and is liquid at 25 ° C.
[R 3 R 4 N-CS -S] 2 -Mo 2 O m S n (2)
In the formula, R 3 and R 4 may be the same or different from each other, and each is a linear or branched alkyl group having 11 to 20 carbon atoms, preferably a linear or branched alkyl group having 11 to 18 carbon atoms. More preferably, it is a linear or branched alkyl group having 11 to 15 carbon atoms. m is 0 to 3, n is 1 to 4, and m + n = 4. In general, molybdenum dithiocarbamate forms a reaction film by a decomposition reaction, and the film prevents contact between sliding members. If the carbon number is within the range specified in the present invention, the decomposition reaction rate is slow. In other words, since the consumption rate of molybdenum dithiocarbamate is slow, the reaction film can be appropriately formed on the surface of the sliding member, so that the friction characteristics can be maintained even when used for a long time. . On the other hand, when the number of carbon atoms is less than 11, the decomposition reaction rate (that is, the reaction film formation rate) is high, the consumption rate of molybdenum dithiocarbamate is high, and a satisfactory reaction film cannot be formed. It can no longer be maintained. In the case of solid molybdenum dithiocarbamate, the friction characteristics of the grease composition cannot be maintained when subjected to heat or shear. This is presumably because the reaction particle formed on the metal surface of the sliding part changed due to the change in particle size due to heat or shear. On the other hand, in the case of liquid molybdenum dithiocarbamate, since the particle size does not change due to heat or shear, the reaction film formed on the metal surface of the sliding part is unlikely to change, and the friction characteristics of the grease composition can be maintained. .
有機モリブデン系化合物の含有量は、グリース組成物の全質量を基準にして、４〜１０質量％である。グリース組成物中の有機モリブデン系化合物の含有量が上記範囲にあると、グリースが熱やせん断を受けても初期と変わらない摩擦特性を維持し、耐スティックスリップ性を維持することができる。
有機モリブデン系化合物の含有量は、グリース組成物の全質量を基準にして、好ましくは４〜８質量％であり、さらに好ましくは４〜６質量％である。
The content of the organomolybdenum compound is 4 to 10% by mass based on the total mass of the grease composition. When the content of the organomolybdenum compound in the grease composition is in the above range, even if the grease is subjected to heat or shear, the friction characteristics that are the same as the initial state can be maintained and the stick-slip resistance can be maintained.
The content of the organomolybdenum compound is preferably 4 to 8% by mass, more preferably 4 to 6% by mass, based on the total mass of the grease composition.
＜その他の添加剤＞
上記添加剤に加え、必要に応じてその他の添加剤が使用可能であり、フェノール系、アミン系に代表される酸化防止剤、ベンゾトリアゾールに代表される金属腐食防止剤、亜硝酸ソーダなどの無機不働態化剤、スルホネート系、コハク酸系、アミン系、カルボン酸塩、酸化亜鉛などの固体添加剤に代表される錆止め剤、脂肪酸、脂肪酸エステル、リン酸エステル、ひまし油などに代表される油性剤、ポリテトラフルオロエチレンや二硫化モリブデンに代表される固体潤滑剤などが挙げられる。これらの成分の使用量は、通常０．１〜２０質量％程度、好ましくは０．５〜１０質量％である。
特に、有機スルホン酸金属塩および硫化油脂を含むことが好ましい。有機スルホン酸金属塩はカルシウム塩であることがより好ましく、アルキルナフタレンスルホン酸カルシウム塩が特に好ましい。ジノニルナフタレンスルホン酸カルシウム塩が最も好ましい。有機スルホン酸金属塩は、組成物の全質量を基準として、０．５〜５質量％含まれるのが好ましい。硫化油脂は硫黄分が３０〜５０質量％であることが好ましく、４０〜５０質量％であることがより好ましく、４０〜４５質量％であることが最も好ましい。硫化油脂は、組成物の全質量を基準として、０．１〜５質量％含まれるのが好ましい。
<Other additives>
In addition to the above additives, other additives can be used as necessary. Inorganics such as antioxidants represented by phenols and amines, metal corrosion inhibitors represented by benzotriazole, and sodium nitrite Rust preventives typified by solid additives such as passivating agents, sulfonates, succinic acids, amines, carboxylates, zinc oxide, and oily agents typified by fatty acids, fatty acid esters, phosphate esters, castor oil, etc. And solid lubricants typified by polytetrafluoroethylene and molybdenum disulfide. The usage-amount of these components is about 0.1-20 mass% normally, Preferably it is 0.5-10 mass%.
In particular, it is preferable to contain an organic sulfonic acid metal salt and sulfurized fat. The organic sulfonic acid metal salt is more preferably a calcium salt, and alkyl naphthalene sulfonic acid calcium salt is particularly preferable. Most preferred is dinonyl naphthalene sulfonate calcium salt. The organic sulfonic acid metal salt is preferably contained in an amount of 0.5 to 5% by mass based on the total mass of the composition. The sulfurized oil / fat preferably has a sulfur content of 30 to 50% by mass, more preferably 40 to 50% by mass, and most preferably 40 to 45% by mass. It is preferable that 0.1-5 mass% of sulfurized fats and oils are contained on the basis of the total mass of a composition.
＜混和ちょう度＞
本発明のグリース組成物の混和ちょう度は、好ましくは２５０〜４００、より好ましくは２５０〜３５０である。
<Mixed penetration>
The penetration of the grease composition of the present invention is preferably 250 to 400, more preferably 250 to 350.
基油中で、ジフェニルメタンジイソシアネートとアミン（シクロヘキシルアミン及びアニリン）とを反応させ、昇温、冷却した後、必要な添加剤を混合し、３本ロールミルで混練し、混和ちょう度３００（６０回往復混和、ＪＩＳ Ｋ２２２０）のグリース組成物を製造した。
調製したグリース組成物の加熱せん断前後のμｓ及びμｄを、ＳＲＶ試験機を用いて下記表２の試験条件により測定した。結果を下記表３に示す。なお、グリース組成物は、表１に記載した条件下において、ＡＳＴＭ Ｄ１８３１に規定されるロール安定度試験を行うことにより加熱し、せん断を加えた。また、μｓは静摩擦係数を、μｄは動摩擦係数を示し、静摩擦係数と動摩擦係数との差は、耐スティックスリップ性を表す。
In the base oil, diphenylmethane diisocyanate and amine (cyclohexylamine and aniline) are reacted, heated and cooled, then the necessary additives are mixed, kneaded with a three-roll mill, and a blending consistency of 300 (reciprocating 60 times). A grease composition of JIS K2220) was produced.
Μs and μd before and after heating shearing of the prepared grease composition were measured under the test conditions shown in Table 2 below using an SRV tester. The results are shown in Table 3 below. The grease composition was heated and sheared by performing a roll stability test specified in ASTM D1831 under the conditions described in Table 1. Further, μs represents a static friction coefficient, μd represents a dynamic friction coefficient, and a difference between the static friction coefficient and the dynamic friction coefficient represents stick-slip resistance.
＜評価基準＞
摩擦特性
○：加熱せん断後のμsおよびμdが０．０７５〜０．０８５
×：加熱せん断後のμsおよびμdのいずれか又は両方が上記範囲外
耐スティックスリップ性
○：加熱せん断後のμs-μdが０．０１２以下
×：加熱せん断後のμs-μdが０．０１２超
<Evaluation criteria>
Friction characteristics ○: μs and μd after heat shearing are 0.075 to 0.085
×: Either or both of μs and μd after heat shearing are out of the above range. Stick-slip resistance ○: μs-μd after heat shearing is 0.012 or less ×: μs-μd after heat shearing exceeds 0.012
＜総合評価＞
○：摩擦特性及び耐スティックスリップ性のいずれも○
×：摩擦特性及び耐スティックスリップ性のいずれか又は両方が×
<Comprehensive evaluation>
○: Both friction characteristics and stick-slip resistance ○
X: Either or both of friction characteristics and stick-slip resistance are x
Claims (5)
基油が鉱油を含み、
増ちょう剤が下記式（１）で表されるジウレア化合物であり、
Ｒ１−ＮＨＣＯＮＨ−Ｒ２−ＮＨＣＯＮＨ−Ｒ３ （１）
（式（１）中、Ｒ２は炭素数６〜１５の２価の芳香族炭化水素基であり、Ｒ１及びＲ３は、互いに同一でも異なっていてもよく、炭素数６又は７のアリール基又はシクロヘキシル基である。）
有機モリブデン系化合物が下記式（２）で表され、２５℃で液体であるジチオカルバミン酸モリブデンであり、及び
[Ｒ3Ｒ4Ｎ−ＣＳ−Ｓ]2−Ｍｏ2ＯmＳn （２）
（式（２）中、Ｒ3，Ｒ4は、互いに同一でも異なっていても良く、それぞれ炭素数が１１〜２０の直鎖又は分岐アルキル基である。ｍは０〜３、ｎは１〜４であり、ｍ＋ｎ＝４である。）
前記組成物が、組成物の全質量を基準として、有機モリブデン系化合物を４〜１０質量％含有する、前記グリース組成物。 A grease composition for constant velocity joints containing an organic molybdenum compound as a thickener, base oil, and additive,
The base oil contains mineral oil,
The thickener is a diurea compound represented by the following formula (1),
R1-NHCONH-R2-NHCONH-R3 (1)
(In the formula (1), R2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 may be the same as or different from each other, and are an aryl group or cyclohexyl having 6 or 7 carbon atoms. Group.)
The organomolybdenum compound is represented by the following formula (2), and is a molybdenum dithiocarbamate that is liquid at 25 ° C .; and
[R 3 R 4 N-CS -S] 2 -Mo 2 O m S n (2)
(In the formula (2), R 3, R 4 may be the same or different from each other, each carbon number of straight-chain or branched alkyl group having 11 to 20 .m is 0 to 3, n is 1 to 4 and m + n = 4.)
The said grease composition contains the organic molybdenum type compound 4-10 mass% on the basis of the total mass of a composition.
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| CN201710138483.5A CN107177403B (en) | 2016-03-10 | 2017-03-09 | Grease composition for constant velocity joint and constant velocity joint |
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| JPH0823034B2 (en) * | 1988-07-09 | 1996-03-06 | 本田技研工業株式会社 | Grease composition for tripod type slide joint |
| JP3988895B2 (en) * | 1996-03-22 | 2007-10-10 | 協同油脂株式会社 | Grease composition for constant velocity joints |
| US6022835A (en) * | 1997-10-22 | 2000-02-08 | Shell Oil Company | Lubricating composition |
| KR100805905B1 (en) * | 2004-02-27 | 2008-02-21 | 교도유시 가부시끼가이샤 | Grease composition for constant velocity joint and constant velocity joint |
| JP4864296B2 (en) * | 2004-07-01 | 2012-02-01 | 協同油脂株式会社 | Grease composition for constant velocity joint and constant velocity joint enclosing it |
| JP4812840B2 (en) * | 2006-04-19 | 2011-11-09 | アール．ティー． ヴァンダービルト カンパニー インコーポレーティッド | Process for the preparation of molybdenum dialkyldithiocarbamate sulphide |
| ES2436776T3 (en) * | 2008-04-01 | 2014-01-07 | Gkn Driveline International Gmbh | Grease composition for use in homokinetic joints |
| US8673829B2 (en) * | 2008-09-05 | 2014-03-18 | Ntn Corporation | Grease composition and grease composition-enclosed rolling bearing and universal joint |
| JP5214649B2 (en) * | 2010-02-26 | 2013-06-19 | 協同油脂株式会社 | Grease composition for hub unit bearing using angular ball bearing and hub unit bearing |
| JP5832082B2 (en) * | 2010-10-27 | 2015-12-16 | リューベ株式会社 | Lubricating grease composition |
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