JP2004123858A - Grease composition for constant velocity joint - Google Patents

Grease composition for constant velocity joint Download PDF

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Publication number
JP2004123858A
JP2004123858A JP2002288398A JP2002288398A JP2004123858A JP 2004123858 A JP2004123858 A JP 2004123858A JP 2002288398 A JP2002288398 A JP 2002288398A JP 2002288398 A JP2002288398 A JP 2002288398A JP 2004123858 A JP2004123858 A JP 2004123858A
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JP
Japan
Prior art keywords
mass
constant velocity
grease composition
content
component
Prior art date
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Abandoned
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JP2002288398A
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Japanese (ja)
Inventor
Junichi Imai
今井 淳一
Takashi Okaniwa
岡庭 隆志
Naohiro Ogura
小倉 尚宏
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Honda Motor Co Ltd
Kyodo Yushi Co Ltd
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Honda Motor Co Ltd
Kyodo Yushi Co Ltd
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Priority to JP2002288398A priority Critical patent/JP2004123858A/en
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Abandoned legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a grease composition for a constant velocity joint which is excellent in anti-flaking performance and heat-resistant performance and shows a low friction coefficient. <P>SOLUTION: The grease composition for the constant velocity joint contains (a) a base oil, (b) a diurea compound of the formula: R<SB>1</SB>NH-CO-NH-C<SB>6</SB>H<SB>4</SB>-p-CH<SB>2</SB>-C<SB>6</SB>C<SB>4</SB>-p-NH-CO-NHR<SB>2</SB>(wherein R<SB>1</SB>and R<SB>2</SB>are identical to or different from each other and are each a 6-7C aryl group or a cyclohexyl group), (c) melamine cyanurate, (d) molybdenum disulfide, (e) a phosphorus-free, sulfur extreme-pressure additive, (f) a calcium salt of an alkyl aromatic sulfonic acid and (g) molybdenum dithiocarbamate. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、等速ジョイント用グリース組成物、特にプランジング型等速ボールジョイント用又は固定型等速ボールジョイント用グリース組成物に関するものである。等速ジョイントの潤滑条件は、極めて高面圧であり、その結果、異常摩耗や金属疲労の発生による、剥離現象、すなわち、ジョイントのフレーキングが発生し易い。本発明は、このような等速ジョイントを潤滑し、ジョイントの摩耗を効果的に低減し、潤滑部分のフレーキングの発生を効果的に防止することのできる等速ジョイント用グリース組成物に関するものである。
【0002】
【従来の技術】
従来、このような等速ジョイントに用いられている潤滑グリースとしては、二硫化モリブデンを含有するリチウム系極圧グリースや、二硫化モリブデンと硫黄−リン系極圧剤やナフテン酸の鉛塩を含有するリチウム系極圧グリースが挙げられる。しかし、これらの等速ジョイント用グリースは、近年の高性能自動車において発生する厳しい作用条件の下では、必ずしも満足なものとはいえない。プランジング型等速ボールジョイントとして用いられているダブルオフセット型等速ジョイントやクロスグルーブ型等速ジョイント等、また固定型等速ボールジョイントとして用いられているバーフィールドジョイント等は、いずれも6個のボールでトルクを伝達する構造を持つ。これらの等速ジョイントでは、回転時高面圧下で複雑なころがりすべりの往復運動により、ボール及びボールと接触する金属表面に繰り返し応力が加わり、金属疲労によるフレーキング現象が発生し易い。近年のエンジンの高出力化、また燃費向上のための自動車の軽量化により、ジョイントのサイズも小さくなるため、相対的に高面圧となり、従来のグリースではフレーキング現象を充分に防止することができない。また、グリースの耐熱性向上も必要になってきている。
上記要求を満足するグリース組成物として、特許文献1には、基油、下記式で表されるジウレア化合物:
NH−CO−NH−C−p−CH−C−p−NH−CO−NHR
(式中、R 及びR は、同一もしくは異なる炭素原子数6又は7のアリール基もしくはシクロヘキシル基である)、メラミンシアヌレート、二硫化モリブデン、及びリン分を含まない硫黄系極圧添加剤を含む等速ジョイント用グリース組成物が記載されている。このグリース組成物は高速四球試験機にて高い極圧性能を示すが、この高い極圧性能を維持しつつ、低摩擦力性に優れたグリース組成物が望まれている。
【特許文献1】
特開平9−255983号公報
【0003】
【発明が解決しようとする課題】
従って、本発明の目的は、フレーキング防止性能及び耐熱性能に優れ、かつ摩擦係数の低い、等速ジョイント用の新規なグリース組成物を提供することである。
【0004】
【課題を解決するための手段】
本発明者等は等速ジョイントの摩耗を最適化し、異常な摩耗や金属疲労によるジョイントのフレーキングを防止し、かつ耐熱性能に優れたグリース組成物を開発するため種々の研究を行った。上記のような高面圧下での複雑なころがりすべり往復運動を伴う潤滑条件で使用するグリースの性能評価を、特にすべり運動に着目し、高速四球試験機として知られる、潤滑性能試験機を用いて行い、各種極圧添加剤、固体潤滑剤又は各種添加剤の組合せによる極圧性能について検討した。その結果本発明者等は、前記特許文献1記載のグリース組成物を開発した。本発明者等はさらにこの組成物の高い極圧性能を維持しつつ、低摩擦力性に優れたグリース組成物について、復動摩擦磨耗試験機(SRV試験機)を用いて検討し、上記グリース組成物にさらにアルキル芳香族スルホン酸のカルシウム塩を添加したグリース組成物、あるいはさらにモリブデンジチオカーバメートを添加したグリース組成物が、高い極圧性能及び低摩擦性を示すことを見出し、さらに、実際の等速ジョイントを用いた耐久性能試験においても、従来の等速ジョイント用グリースとは異なり、フレーキング現象の発生を効果的に防止し得ることを確認し、本発明を完成するに至った。
【0005】
本発明は、下記の成分を含む等速ジョイント用グリース組成物である。
(a) 基油、
(b) 下記式で表されるジウレア化合物:
NH−CO−NH−C−p−CH−C−p−NH−CO−NHR
(式中、R 及びR は、同一もしくは異なる炭素原子数6又は7のアリール基もしくはシクロヘキシル基である)、
(c) メラミンシアヌレート、
(d) 二硫化モリブデン、
(e) リン分を含まない硫黄系極圧添加剤、及び
(f) アルキル芳香族スルホン酸のカルシウム塩。
【0006】
【発明の実施の形態】
本発明の好ましい実施態様は、上記(a) 〜(f) 成分に加えて、(g) モリブデンジチオカーバメートを含有する等速ジョイント用グリース組成物である。
本発明に使用する(a) 成分の基油としては、鉱物油、エステル系合成油、エーテル系合成油、炭化水素系合成油等の普通に使用されている潤滑油又はそれらの混合油が挙げられるが、これらに限定されるものではない。
本発明に使用する(b) 成分のジウレア化合物は、アニリン、p−トルイジン等の芳香族系アミン、シクロヘキシルアミン、又はこれらの混合物と、ジイソシアネート化合物との反応によって得られる、ジウレア化合物であり、ジウレア化合物中のアリール基は6又は7個の炭素原子を有するものが好ましく、ジウレア化合物中のアリール基の割合は、100ないし0%である。
【0007】
本発明に使用する(c) 成分のメラミンシアヌレートは、メラミンとシアヌル酸の付加物である。シアヌル酸は、イソシアヌル酸と互変異性の関係にあり、通常市販されているメラミンシアヌレートは、メラミン1モルとシアヌル酸1モルの付加物であり、メラミンイソシアヌレートの形態にある。この明細書において、メラミンシアヌレートは、メラミンとシアヌル酸又はイソシアヌル酸の付加物を示すものとする。メラミンシアヌレートは、例えば、メラミン水溶液とシアヌル酸又はイソシアヌル酸水溶液を混合すると容易に白色の沈殿として析出してくる。メラミンシアヌレートは、通常平均粒径1〜2μmの白色微粉末として市販されており、6員環構造のメラミン分子とシアヌル酸分子が水素結合で強力に結合して平面状に配列し、その平面が互いに弱い結合力で層状に重なりあって、二硫化モリブデンと同様にへき開性を有すると推定され、優れた潤滑性を与えるものと考えられる。
【0008】
本発明に使用する(d) 成分の二硫化モリブデンは、一般に極圧添加剤として広く用いられている。その潤滑機構としては、層状格子構造を持ち、すべり運動により薄層状に容易にせん断し、摩擦係数を低下させることが知られている。また、ジョイントの焼け付き防止にも効果がある。
本発明に使用する(e) 成分である、リン分を含まない、硫黄極圧添加剤として好ましいものは、硫黄分35〜50質量%のものである。
本発明に使用する(f) 成分である、アルキル芳香族スルホン酸のカルシウム塩は、エンジン油等の潤滑油に用いられる金属系清浄分散剤や防錆剤として知られているジノニルナフタレンスルホン酸やアルキルベンゼンスルホン酸のようなアルキル芳香族スルホン酸などの合成スルホン酸のカルシウム塩である。
【0009】
本発明に使用する(g)成分である、モリブデンジチオカーバメートの好ましい例としては下記の式で表されるものが挙げられる。
〔RN−CS−S〕−Mo(式中、R 及びR は、それぞれ独立して、炭素原子数1〜24、好ましくは3〜18のアルキル基を表し、mは0〜3、nは4〜1、m+n=4である。)
本発明の等速ジョイント用グリース組成物には、上記成分に加えて、酸化防止剤、防錆剤、防食剤等を含有させることができる。
【0010】
本発明の等速ジョイント用グリース組成物は、好ましくはグリース組成物の全質量に対して、(a) 成分の基油:60.0〜98.3質量%、(b) 成分のジウレア化合物:1〜25質量%、(c) 成分のメラミンシアヌレート:0.1〜5.0質量%、(d) 成分の二硫化モリブデン:0.5〜5.0質量%、(e) 成分のアルキル芳香族スルホン酸のカルシウム塩:0.1〜5質量%、及び(f) 成分のリン分を含まない硫系極圧添加剤:0.1〜5.0質量%を含んでいる。
本発明の他の等速ジョイント用グリース組成物は、好ましくは、グリース組成物の全質量に対して、(a) 成分の基油:55.0〜98.2質量%、(b) 成分のジウレア化合物:1〜25質量%、(c) 成分のメラミンシアヌレート:0.1〜5.0質量%、(d) 成分の二硫化モリブデン:0.5〜5.0質量%、(e) 成分のアルキル芳香族スルホン酸のカルシウム塩:0.1〜5質量%、(f) 成分のリン分を含まない硫黄系極圧添加剤:0.1〜5.0質量%、(g) 成分のモリブデンジチオカーバメート:0.1〜5.0質量%を含んでいる。
【0011】
(b) 成分のジウレア化合物の含有量が1質量%未満では、増ちょう効果が少なくなり、グリース化しにくくなり、25質量%より多いと、得られた組成物が硬くなり過ぎ、所期の効果が得られにくくなる。
(c) 成分のメラミンシアヌレートの含有量が0.1質量%未満、(d) 成分の二硫化モリブデンの含有量が0.5 質量%未満、(e) 成分のアルキル芳香族スルホン酸のカルシウム塩の含有量が0.1質量%未満、(f) 成分のリン分を含まない硫黄系極圧添加剤の含有量が0.1質量%未満では、所期の効果を十分に得ることが困難な場合があり、一方(c) 成分の含有量が5質量%より多く、(d) 成分の含有量が5質量%より多く、(e) 成分の含有量が5質量%より多く、(f) 成分の含有量が5質量%より多い場合にも、効果の増大はなく、フレーキング防止効果においては、むしろ逆効果である。
また、(g) 成分のモリブデンジチオカーバメートの含有量が0.1質量%未満であるか、5質量%より多い場合には、添加効果が顕著でなくなる。
【0012】
【実施例】
次に本発明を実施例及び比較例により説明する。
〔実施例1〜4、比較例1〜5〕
容器に基油4100gとジフェニルメタン−4,4′−ジイソシアネート1012gをとり、混合物を70〜80℃に加熱した。別容器に基油4100gとシクロヘキシルアミン563g、アニリン225gをとり、70〜80℃に加熱後、先の容器に加えた。混合物をよく攪拌しながら、30分間反応させ、その後攪拌しながら、160℃まで昇温し、放冷し、ベースウレアグリースを得た。
このベースグリースに、表1及び表2に示す配合で、添加剤を添加し、適宜基油を加え、得られる混合物を、三段ロールミルにて、ちょう度No. 1 グレードに調整した。上記実施例及び比較例において、いずれもグリースの基油としては以下の特性を有するP系鉱油を使用した。
粘度100℃ 16.5mm/s
【0013】
これらのグリース組成物につき以下に示す試験方法で物性の評価を行い、得られた結果を表1及び表2に併記した。

Figure 2004123858
【0014】
<実ジョイント台上耐久試験>
下記条件にて、実ジョイントでの台上耐久試験を行い、フレーキング等の発生の時間を評価した。
Figure 2004123858
【0015】
【表1】
Figure 2004123858
【0016】
【表2】
Figure 2004123858
【0017】
1) モノアミンとして、シクロヘキシルアミンとアニリンを混合使用したジウレア化合物を用いたジウレアグリース
2) メラミンシアヌレート(商品名:MCA 三菱化学株式会社製)
3) 二硫化モリブデン(スーパーファイン グレード)(商品名:Molysulfide CLIMAX MOLYBDENUM COMPANY 製平均粒径0.45μm)
4) 硫黄系極圧剤(商品名:Anglamol 33 日本ルーブリゾール(Lubrizol)社製)
5) モリブデンジチオカーバメート(商品名:Molyvan A R.T.Vanderbilt社製)
6) カルシウムスルホネート(商品名:NASUL 729 KING INDUSTRIES社製)
【0018】
表1及び表2から、以下のことが分かる。
成分(a) ̄(f)を含む実施例1及び2のグリース組成物は、高い極圧性能を有するとともに、摩擦係数が低く、剥離寿命が長い。成分(a) ̄(f)及び成分(g)を含む実施例3及び4のグリース組成物は、高い極圧性能を維持するとともに、摩擦係数がさらに低く、剥離寿命がさらに長い。
成分(c)及び成分(g)を含まない比較例1のグリース組成物は、極圧性能が低く、摩擦係数が高く、剥離寿命が短い。成分(d)及び成分(g)を含まない比較例2のグリース組成物は、極圧性能が低く、摩擦係数が高く、剥離寿命が短い。成分(e)を含まない比較例3のグリース組成物は、極圧性能が低く、摩擦係数が高く、剥離寿命が短い。成分(f)を含まない比較例4及び5のグリース組成物は、極圧性能は高いが、摩擦係数が高く、剥離寿命が短い。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grease composition for a constant velocity joint, and more particularly to a grease composition for a plunging type constant velocity ball joint or a fixed type constant velocity ball joint. The lubricating condition of the constant velocity joint is extremely high surface pressure, and as a result, a peeling phenomenon, that is, flaking of the joint due to occurrence of abnormal wear or metal fatigue is likely to occur. The present invention relates to a grease composition for a constant velocity joint that can lubricate such a constant velocity joint, effectively reduce the wear of the joint, and effectively prevent the occurrence of flaking in the lubricated portion. is there.
[0002]
[Prior art]
Conventionally, lubricating greases used in such constant velocity joints include lithium extreme pressure grease containing molybdenum disulfide, molybdenum disulfide and sulfur-phosphorus extreme pressure agent, and lead salt of naphthenic acid. Lithium-based extreme pressure grease. However, these greases for constant velocity joints are not always satisfactory under the severe operating conditions that occur in recent high-performance automobiles. Double offset constant velocity joints and cross groove constant velocity joints used as plunging constant velocity ball joints, and bar field joints used as fixed constant velocity ball joints are all six. It has a structure to transmit torque with a ball. In these constant velocity joints, the ball and the metal surface in contact with the ball are repeatedly subjected to stress by the reciprocating motion of the complicated rolling and sliding under a high surface pressure during rotation, and a flaking phenomenon due to metal fatigue is likely to occur. In recent years, the output of engines has been increased, and the weight of automobiles has been reduced to improve fuel efficiency.The joint size has also been reduced, resulting in a relatively high surface pressure, and conventional grease has been able to sufficiently prevent the flaking phenomenon. Can not. In addition, it has become necessary to improve the heat resistance of grease.
As a grease composition satisfying the above requirements, Patent Document 1 discloses a base oil and a diurea compound represented by the following formula:
R 1 NH-CO-NH- C 6 H 4 -p-CH 2 -C 6 C 4 -p-NH-CO-NHR 2
(Wherein, R 1 and R 2 are the same or different and are an aryl group or cyclohexyl group having 6 or 7 carbon atoms), melamine cyanurate, molybdenum disulfide, and a sulfur-based extreme pressure additive containing no phosphorus component A grease composition for constant velocity joints containing: This grease composition exhibits high extreme pressure performance in a high-speed four-ball testing machine, and a grease composition excellent in low frictional force while maintaining this high extreme pressure performance is desired.
[Patent Document 1]
JP-A-9-255983
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a novel grease composition for a constant velocity joint, which has excellent anti-flaking performance and heat resistance performance and has a low coefficient of friction.
[0004]
[Means for Solving the Problems]
The present inventors have conducted various studies to optimize the wear of a constant velocity joint, prevent flaking of the joint due to abnormal wear and metal fatigue, and develop a grease composition having excellent heat resistance. Performance evaluation of grease used under lubricating conditions involving complex rolling sliding reciprocating motion under high surface pressure as described above, paying particular attention to sliding motion, using a lubrication performance tester known as a high-speed four-ball testing machine Then, the extreme pressure performance of various extreme pressure additives, solid lubricants or combinations of various additives was examined. As a result, the present inventors have developed the grease composition described in Patent Document 1. The present inventors further studied a grease composition having excellent low frictional force while maintaining high extreme pressure performance of this composition using a backward friction and abrasion tester (SRV tester). Grease composition obtained by further adding a calcium salt of an alkyl aromatic sulfonic acid to the product, or a grease composition further added by molybdenum dithiocarbamate, shows high extreme pressure performance and low frictional properties. In a durability performance test using a speed joint, it has been confirmed that unlike the conventional grease for constant velocity joints, the occurrence of the flaking phenomenon can be effectively prevented, and the present invention has been completed.
[0005]
The present invention is a grease composition for a constant velocity joint that includes the following components.
(A) base oil,
(B) a diurea compound represented by the following formula:
R 1 NH-CO-NH- C 6 H 4 -p-CH 2 -C 6 C 4 -p-NH-CO-NHR 2
(Wherein, R 1 and R 2 are the same or different aryl groups or cyclohexyl groups having 6 or 7 carbon atoms),
(C) melamine cyanurate,
(D) molybdenum disulfide,
(E) a sulfur-based extreme pressure additive that does not contain phosphorus, and (f) a calcium salt of an alkyl aromatic sulfonic acid.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention is a grease composition for a constant velocity joint containing (g) molybdenum dithiocarbamate in addition to the above components (a) to (f).
Examples of the base oil (a) used in the present invention include commonly used lubricating oils such as mineral oils, ester-based synthetic oils, ether-based synthetic oils, and hydrocarbon-based synthetic oils, or mixtures thereof. However, the present invention is not limited to these.
The diurea compound (b) used in the present invention is a diurea compound obtained by reacting an aromatic amine such as aniline or p-toluidine, cyclohexylamine, or a mixture thereof with a diisocyanate compound. The aryl group in the compound preferably has 6 or 7 carbon atoms, and the ratio of the aryl group in the diurea compound is 100 to 0%.
[0007]
The melamine cyanurate of the component (c) used in the present invention is an adduct of melamine and cyanuric acid. Cyanuric acid has a tautomeric relationship with isocyanuric acid, and commercially available melamine cyanurate is an adduct of 1 mol of melamine and 1 mol of cyanuric acid, and is in the form of melamine isocyanurate. In this specification, melamine cyanurate shall mean an adduct of melamine and cyanuric acid or isocyanuric acid. Melamine cyanurate easily precipitates as a white precipitate when, for example, a melamine aqueous solution is mixed with a cyanuric acid or isocyanuric acid aqueous solution. Melamine cyanurate is usually commercially available as a fine white powder having an average particle diameter of 1 to 2 μm, and a melamine molecule having a 6-membered ring structure and a cyanuric acid molecule are strongly bonded by hydrogen bonding and arranged in a plane. Are layered with weak bonding force to each other and are presumed to have cleavage like molybdenum disulfide, and are considered to provide excellent lubricity.
[0008]
Molybdenum disulfide as the component (d) used in the present invention is generally widely used as an extreme pressure additive. It is known that the lubricating mechanism has a laminar lattice structure, easily shears into a thin layer by a sliding motion, and lowers the friction coefficient. It is also effective in preventing seizure of the joint.
As the (e) component used in the present invention, a sulfur-free, extreme-pressure additive which does not contain phosphorus is preferably one having a sulfur content of 35 to 50% by mass.
The calcium salt of alkyl aromatic sulfonic acid, which is the component (f) used in the present invention, is dinonyl naphthalene sulfonic acid, which is known as a metal-based detergent / dispersant or rust inhibitor used in lubricating oils such as engine oils. And a calcium salt of a synthetic sulfonic acid such as an alkyl aromatic sulfonic acid such as alkylbenzenesulfonic acid.
[0009]
Preferred examples of molybdenum dithiocarbamate which is the component (g) used in the present invention include those represented by the following formula.
[R 4 R 3 N-CS- S ] in 2 -Mo 2 O m S n (wherein, R 3 and R 4 are each independently 1 to 24 carbon atoms, preferably an alkyl group having 3 to 18 And m is 0 to 3, n is 4 to 1, and m + n = 4.)
The grease composition for a constant velocity joint of the present invention may contain an antioxidant, a rust inhibitor, an anticorrosive, and the like in addition to the above components.
[0010]
The grease composition for a constant velocity joint of the present invention is preferably 60.0 to 98.3% by mass of the base oil of the component (a), and the diurea compound of the component (b), based on the total mass of the grease composition. 1 to 25% by mass, melamine cyanurate of component (c): 0.1 to 5.0% by mass, molybdenum disulfide of component (d): 0.5 to 5.0% by mass, alkyl of component (e) It contains 0.1 to 5% by mass of a calcium salt of an aromatic sulfonic acid, and 0.1 to 5.0% by mass of a sulfur-based extreme pressure additive containing no component (f).
Another grease composition for a constant velocity joint of the present invention is preferably a base oil of component (a): 55.0 to 98.2% by mass, and a component (b) of the total mass of the grease composition. Diurea compound: 1 to 25% by mass, melamine cyanurate of component (c): 0.1 to 5.0% by mass, molybdenum disulfide of component (d): 0.5 to 5.0% by mass, (e) Component calcium salt of alkyl aromatic sulfonic acid: 0.1 to 5% by mass, component (f) sulfur-free extreme pressure additive containing no phosphorus component: 0.1 to 5.0% by mass, component (g) Molybdenum dithiocarbamate: 0.1 to 5.0% by mass.
[0011]
(B) If the content of the diurea compound as the component is less than 1% by mass, the thickening effect is reduced and it is difficult to form a grease. If the content is more than 25% by mass, the obtained composition becomes too hard and the desired effect is obtained. Is difficult to obtain.
(C) the content of melamine cyanurate of the component is less than 0.1% by mass, (d) the content of molybdenum disulfide of less than 0.5% by mass, (e) calcium of the alkyl aromatic sulfonic acid of the component If the content of the salt is less than 0.1% by mass and the content of the sulfur-based extreme pressure additive containing no phosphorus component (f) is less than 0.1% by mass, the desired effect can be sufficiently obtained. In some cases, the content of the component (c) is more than 5% by mass, the content of the component (d) is more than 5% by mass, the content of the component (e) is more than 5% by mass, f) When the content of the component is more than 5% by mass, the effect is not increased, and the anti-flaking effect is rather the opposite effect.
When the content of molybdenum dithiocarbamate as the component (g) is less than 0.1% by mass or more than 5% by mass, the effect of addition becomes insignificant.
[0012]
【Example】
Next, the present invention will be described with reference to Examples and Comparative Examples.
[Examples 1 to 4, Comparative Examples 1 to 5]
4100 g of base oil and 1012 g of diphenylmethane-4,4'-diisocyanate were placed in a container, and the mixture was heated to 70 to 80C. 4100 g of base oil, 563 g of cyclohexylamine, and 225 g of aniline were placed in another container, heated to 70 to 80 ° C., and added to the previous container. The mixture was reacted for 30 minutes with good stirring, then heated to 160 ° C. with stirring, and allowed to cool to obtain a base urea grease.
Additives were added to this base grease in the proportions shown in Tables 1 and 2, and a base oil was added as appropriate. Adjusted to 1 grade. In each of the above Examples and Comparative Examples, a P-based mineral oil having the following characteristics was used as a base oil for grease.
Viscosity 100 ° C 16.5mm 2 / s
[0013]
Physical properties of these grease compositions were evaluated by the following test methods, and the obtained results are shown in Tables 1 and 2.
Figure 2004123858
[0014]
<Endurance test on actual joint table>
Under the following conditions, a bench durability test was performed with the actual joint, and the time of occurrence of flaking and the like was evaluated.
Figure 2004123858
[0015]
[Table 1]
Figure 2004123858
[0016]
[Table 2]
Figure 2004123858
[0017]
1) Diurea grease using a diurea compound using a mixture of cyclohexylamine and aniline as a monoamine 2) Melamine cyanurate (trade name: MCA manufactured by Mitsubishi Chemical Corporation)
3) Molybdenum disulfide (super fine grade) (trade name: Polysulfide Climax Molybden Company, average particle size 0.45 μm)
4) Sulfur-based extreme pressure agent (trade name: Anglamol 33 manufactured by Lubrizol Japan)
5) Molybdenum dithiocarbamate (trade name: Molyvan A RT Vanderbilt)
6) Calcium sulfonate (trade name: NASUL 729 KING INDUSTRIES)
[0018]
The following can be seen from Tables 1 and 2.
The grease compositions of Examples 1 and 2 containing the components (a)  ̄ (f) have high extreme pressure performance, a low coefficient of friction, and a long peel life. The grease compositions of Examples 3 and 4 containing component (a)  ̄ (f) and component (g) maintain high extreme pressure performance, have a lower coefficient of friction, and have a longer peel life.
The grease composition of Comparative Example 1, which does not contain the component (c) and the component (g), has a low extreme pressure performance, a high coefficient of friction, and a short peel life. The grease composition of Comparative Example 2, which does not contain the component (d) and the component (g), has a low extreme pressure performance, a high friction coefficient, and a short peel life. The grease composition of Comparative Example 3 containing no component (e) has a low extreme pressure performance, a high coefficient of friction, and a short peel life. The grease compositions of Comparative Examples 4 and 5, which do not contain the component (f), have high extreme pressure performance, but have a high coefficient of friction and a short peel life.

Claims (4)

下記の成分を含む等速ジョイント用グリース組成物。
(a) 基油、
(b)下記式で表されるジウレア化合物:
NH−CO−NH−C−p−CH−C−p−NH−CO−NHR
(式中、R 及びR は、同一もしくは異なる炭素原子数6又は7のアリール基もしくはシクロヘキシル基である)、
(c) メラミンシアヌレート、
(d) 二硫化モリブデン、
(e) リン分を含まない硫黄系極圧添加剤、及び
(f) アルキル芳香族スルホン酸のカルシウム塩。
A grease composition for a constant velocity joint containing the following components.
(A) base oil,
(B) a diurea compound represented by the following formula:
R 1 NH-CO-NH- C 6 H 4 -p-CH 2 -C 6 C 4 -p-NH-CO-NHR 2
(Wherein, R 1 and R 2 are the same or different aryl groups or cyclohexyl groups having 6 or 7 carbon atoms),
(C) melamine cyanurate,
(D) molybdenum disulfide,
(E) a sulfur-based extreme pressure additive that does not contain phosphorus, and (f) a calcium salt of an alkyl aromatic sulfonic acid.
さらに、(g) モリブデンジチオカーバメートを含有する、請求項1記載の等速ジョイント用グリース組成物。The grease composition for constant velocity joints according to claim 1, further comprising (g) molybdenum dithiocarbamate. 全組成物中、ジウレア化合物の含有量が、1〜25質量%、メラミンシアヌレートの含有量が0.1〜5質量%、二硫化モリブデンの含有量が0.5〜5質量%、リン分を含まない硫黄系極圧添加剤の添加量が0.1〜3質量%、アルキル芳香族スルホン酸のカルシウム塩の添加量が0.1〜5質量%である、請求項1記載の等速ジョイント用グリース組成物。In the entire composition, the content of the diurea compound is 1 to 25% by mass, the content of melamine cyanurate is 0.1 to 5% by mass, the content of molybdenum disulfide is 0.5 to 5% by mass, The constant velocity according to claim 1, wherein the addition amount of the sulfur-based extreme pressure additive containing no is 0.1 to 3% by mass, and the addition amount of the calcium salt of the alkyl aromatic sulfonic acid is 0.1 to 5% by mass. Grease composition for joints. 全組成物中、ジウレア化合物の含有量が1〜25質量%、メラミンシアヌレートの含有量が0.1〜5質量%、二硫化モリブデンの含有量が0.5〜5質量%、リン分を含まない硫黄系極圧添加剤の添加量が0.1〜3質量%、アルキル芳香族スルホン酸のカルシウム塩の添加量が0.1〜5質量%、モリブデンジチオカーバメートの添加量が0.1〜5質量%である、請求項2記載の等速ジョイント用グリース組成物。In the entire composition, the content of the diurea compound is 1 to 25% by mass, the content of the melamine cyanurate is 0.1 to 5% by mass, the content of the molybdenum disulfide is 0.5 to 5% by mass, 0.1 to 3% by mass of the sulfur-based extreme pressure additive not contained, 0.1 to 5% by mass of the calcium salt of the alkyl aromatic sulfonic acid, and 0.1 to 5% by mass of the molybdenum dithiocarbamate. The grease composition for a constant velocity joint according to claim 2, wherein the amount is 5 to 5% by mass.
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WO2006004035A1 (en) * 2004-07-01 2006-01-12 Kyodo Yushi Co., Ltd. Grease composition for constant velocity joints and constant velocity joints prelubricated with the same
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US7910526B2 (en) 2004-07-01 2011-03-22 Kyodo Yushi Co., Ltd. Grease composition for constant velocity joint and constant velocity joint containing the composition sealed therein
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