JP2764724B2 - Grease composition with long life at high temperature - Google Patents
Grease composition with long life at high temperatureInfo
- Publication number
- JP2764724B2 JP2764724B2 JP63086631A JP8663188A JP2764724B2 JP 2764724 B2 JP2764724 B2 JP 2764724B2 JP 63086631 A JP63086631 A JP 63086631A JP 8663188 A JP8663188 A JP 8663188A JP 2764724 B2 JP2764724 B2 JP 2764724B2
- Authority
- JP
- Japan
- Prior art keywords
- grease
- oil
- high temperature
- grease composition
- long life
- 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.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 （産業上の利用分野） 近年の機械技術の進歩は著しく、自動車産業では、部
品の小型・軽量化による軸受の高速化が進み、潤滑箇所
が高温となる傾向がある。特に電装品では、潤滑箇所が
発熱体であるエンジンに直結あるいは近傍に位置してお
り高温化が著しい。また、製鉄産業においても、連続鋳
造設備等の普及により、高温の潤滑箇所が増加してい
る。本発明は、これらの潤滑条件に応える高温で、長寿
命、高信頼性を有するグリース組成物に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) In recent years, mechanical technology has made remarkable progress, and in the automobile industry, the speed of bearings has been increased by reducing the size and weight of parts, and the temperature of lubricated parts tends to be high. . In particular, in electrical components, the lubricating point is directly connected to or near the engine, which is a heating element, and the temperature rises remarkably. Also, in the steelmaking industry, high-temperature lubricating points are increasing due to the spread of continuous casting equipment and the like. The present invention relates to a grease composition having a long service life and high reliability at a high temperature which meets these lubrication conditions.
（従来の技術） このような高温箇所の潤滑をグリースの使用技術から
見ると、例えば自動車産業では、潤滑部品の早期交換に
よって、また製鉄産業では、グリースの集中給脂によっ
て対処されてきた。しかし、これらの方法は、メンテナ
ンスフリー化や省資源等の考え方に反するものである。(Prior art) From the viewpoint of grease application technology, lubrication at such a high-temperature portion has been dealt with, for example, by early replacement of lubricating parts in the automobile industry and by centralized grease lubrication in the steelmaking industry. However, these methods are contrary to the concept of maintenance-free and resource saving.
グリースの内容では、高温で長寿命を有するグリース
を得る為に、様々な改良、発明がなされており、その多
くはグリースの基本となる基油と増ちょう剤に関するも
のであった。In terms of grease, various improvements and inventions have been made in order to obtain grease having a long service life at high temperatures, and many of them have been concerned with base oils and thickeners which are basic greases.
（発明が解決しようとする課題） かかる現況下で、基油の面では市場のグリースの多く
のものでは鉱油が使用されている。鉱油は、蒸発・酸化
劣化の点で、高温での連続使用に耐えない。合成油であ
るエステル油やポリαオレフィン油は、一般に鉱油より
耐熱性に優れるが、前者は、高温潤滑に対して粘度が不
足している事、蒸発・酸化劣化の点で、後者は、蒸発・
酸化劣化およびこれに伴うスラッジの生成等の欠点があ
り、160℃以上での長時間の使用に耐えない。増ちょう
剤の面では、金属石けん系は、高温下で増ちょう剤構造
が破壊され長期の使用に耐えず、クレイ系は、高温下で
の潤滑性に欠点が有る。ウレア系は、これらより良好な
耐熱性を示すが、末端基が、脂肪族および脂環族主体の
ものは、せん断安定性に欠点が有り、また潤滑面に対し
ての付着性も劣る事より潤滑部からの軟化漏洩という欠
点が有った。(Problems to be Solved by the Invention) Under the present situation, mineral oil is used in many greases on the market in terms of base oil. Mineral oil does not withstand continuous use at high temperatures in terms of evaporation and oxidative degradation. Ester oils and poly-α-olefin oils, which are synthetic oils, generally have better heat resistance than mineral oils, but the former has insufficient viscosity for high-temperature lubrication, and the latter has the・
It has drawbacks such as oxidative deterioration and associated sludge formation, and cannot withstand long-term use at 160 ° C. or higher. In terms of thickeners, metallic soaps have a thickener structure that is destroyed at high temperatures and cannot withstand long-term use, and clays have a drawback in lubricity at high temperatures. The urea-based compounds exhibit better heat resistance than these, but those having terminal groups mainly composed of aliphatic and alicyclic groups have disadvantages in shear stability and poor adhesion to lubricated surfaces. There was a drawback of softening leakage from the lubrication part.
従って本発明は、基油に、高温下において蒸発、酸化
劣化、スラッジ生成の少ない耐熱性の優れた合成油を使
用し、増ちょう剤に、せん断安定性、付着性の優れたウ
レア系化合物を使用する事により、高温で長寿命を有す
るグリースを得る、この高い信頼性を有するグリースを
産業界に提供することで、メンテナンスフリー化、省資
源化を促進することを目的としている。Therefore, the present invention uses a synthetic oil excellent in heat resistance with little evaporation, oxidative deterioration and sludge formation at high temperature as a base oil, and as a thickener, a urea-based compound excellent in shear stability and adhesion. An object of the present invention is to provide a grease having a high reliability at a high temperature by using the grease. The grease having a high reliability is provided to the industry to promote maintenance-free and resource saving.
（課題を解決するための手段） 本発明は、高温で長寿命かつ高信頼性を有するグリー
スを得るべく鋭意研究の結果達成されたもので、合成油
としてアルキルジフェニルエーテル油を必須成分とする
基油に、増ちょう剤として、次の一般式 （式中のR2は炭素数６〜15の芳香族系炭化水素基、R1お
よびR3は炭素数６〜12の芳香族系炭化水素基または炭素
数８〜20の直鎖アルキル基で、かつR1およびR3中に占め
る芳香族系炭化水素基の割合が70〜100モル％である）
で表されるジウレア化合物を２〜35重量％配合したこと
を特徴とする高温で長寿命を有するグリース組成物に関
するものである。(Means for Solving the Problems) The present invention has been achieved as a result of earnest studies to obtain a grease having a long life and high reliability at a high temperature, and a base oil containing an alkyldiphenyl ether oil as an essential component as a synthetic oil. In addition, as a thickener, the following general formula (In the formula, R 2 is an aromatic hydrocarbon group having 6 to 15 carbon atoms, R 1 and R 3 are an aromatic hydrocarbon group having 6 to 12 carbon atoms or a linear alkyl group having 8 to 20 carbon atoms. And the proportion of the aromatic hydrocarbon group in R 1 and R 3 is 70 to 100 mol%)
The present invention relates to a grease composition having a long life at a high temperature, characterized by containing a diurea compound represented by the following formula (2) to 35% by weight.
本発明に用いられるアルキルジフェニルエーテルは、
ジフェニルエーテル１モルと、炭素数10〜22のα−オレ
フィン１〜３モルの付加反応により得られ、α−オレフ
ィンの炭素数、使用モル数によって性状は異なるが、無
色から黄色の透明液体であり、それ自体公知物質であ
る。アルキルジフェニルエーテル油に関しては、特公昭
51−44263号公報にアルキルジフェニルエーテル油を必
須成分とするロータリーポンプ油、特公昭52−1722号公
報に耐海水性作動油、特公昭52−24628号公報に拡散ポ
ンプ油、特公昭58−22515号公報に高温下で使用される
チェーン用潤滑油が開示されている。本発明において
は、アルキルジフェニルエーテルの含有量は特に限定し
ないが、高温で長寿命を有するグリースを得る為に、好
ましくは、基油に対して50重量％以上を含有させる必要
があり、併用できる基油は、例えば鉱油、およびジエス
テル、テトラエステルに代表されるエステル系合成油、
ポリαオレフィンで代表される合成炭化水素油である。Alkyl diphenyl ether used in the present invention,
It is obtained by the addition reaction of 1 mol of diphenyl ether and 1 to 3 mol of α-olefin having 10 to 22 carbon atoms, and its properties vary depending on the number of carbon atoms and the number of moles of α-olefin, but it is a colorless to yellow transparent liquid. It is a known substance per se. Regarding alkyl diphenyl ether oil,
JP-B-51-44263 discloses a rotary pump oil containing an alkyldiphenyl ether oil as an essential component, JP-B-52-1722 discloses a seawater-resistant hydraulic oil, JP-B-52-24628 discloses a diffusion pump oil, and JP-B-58-22515. The gazette discloses a chain lubricating oil used at high temperatures. In the present invention, the content of the alkyl diphenyl ether is not particularly limited. However, in order to obtain a grease having a long life at a high temperature, it is preferable that the content of the alkyl diphenyl ether be 50% by weight or more based on the base oil. Oils are, for example, mineral oils, and ester-based synthetic oils represented by diesters and tetraesters,
It is a synthetic hydrocarbon oil represented by polyalphaolefin.
また、増ちょう剤として用いられる式（１）で表わさ
れるジウレア化合物は、通常、ジイソシアネートとモノ
アミンの反応で得られるもので、本発明においては式
（１）中のR1およびR3中に占める芳香族炭化水素基の割
合は70〜100モル％とするが、このようにする理由は70
モル％以上とするとせん断安定性および潤滑面に対して
の付着性に優れ、高温下での軸受からの漏洩がほとんど
なく、長時間の使用に耐えるからである。上記反応後に
R2となるジイソシアネートとしては2,4−トリレンジイ
ソシアネート、2,6−トリレンジイソシアネート、ジフ
ェニルメタン−4,4′−ジイソシアネート、ナフタレン
−1,5−ジイソシアネート等の芳香族イソシアネートお
よび、これらの混合物であり、R1,R3となるモノアミン
としては、アニリン、ベンジルアミン、トルイジン、ク
ロロアニリン等の芳香族アミンおよび、オクチルアミ
ン、ノニルアミン、デシルアミン、ウンデシルアミン、
ドデシルアミン、トリデシルアミン、テトラデシルアミ
ン、ペンタデシルアミン、ヘキサデシルアミン、ヘプタ
デシルアミン、オクタデシルアミン、ノニルデシルアミ
ン、エイコシルアミン等の直鎖アミンである。上記ジウ
レア化合物の配合量は、基油に対して２〜35重量％で、
２重量％未満では、得られるグリースは流動状であり、
また35重量％を超えると固体化してしまうためいずれも
軸受等を潤滑するグリースとして適さない。The diurea compound represented by the formula (1) used as a thickener is usually obtained by a reaction of a diisocyanate and a monoamine, and occupies in R 1 and R 3 in the formula (1) in the present invention. The proportion of the aromatic hydrocarbon group is set to 70 to 100 mol%.
If it is at least mol%, the shear stability and the adhesion to the lubricated surface will be excellent, there will be almost no leakage from the bearing at high temperatures, and it will withstand long-term use. After the above reaction
Examples of the diisocyanate to be R 2 include aromatic isocyanates such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, and naphthalene-1,5-diisocyanate, and mixtures thereof. There, R 1 , R 3 as a monoamine, aniline, benzylamine, toluidine, aromatic amines such as chloroaniline, and octylamine, nonylamine, decylamine, undecylamine,
It is a linear amine such as dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, octadecylamine, nonyldecylamine and eicosylamine. The amount of the diurea compound is 2 to 35% by weight based on the base oil.
Below 2% by weight, the resulting grease is fluid,
If it exceeds 35% by weight, it will solidify, and neither is suitable as grease for lubricating bearings.
また、本発明のグリース組成物には、必要に応じて、
酸化防止剤、防錆剤、極圧剤、油性剤、固体潤滑剤等の
添加剤を添加することができる。Further, the grease composition of the present invention, if necessary,
Additives such as antioxidants, rust inhibitors, extreme pressure agents, oil agents, solid lubricants, etc. can be added.
（作 用） 本発明に使用したアルキルジフェニルエーテル油は、
高温下で、充分な粘度を有し、従来の合成油、すなわ
ち、エステル油や、ポリα−オレフィン油より高温下で
の蒸発が少なく、また、酸化安定性に優れスラッジの生
成も少ない、また、末端芳香族および末端芳香族主体の
ジウレア化合物を増ちょう剤としたグリースは、ウレア
グリース特有の良好な耐熱性、酸化安定性を示す事はも
とより、良好なせん断安定性、付着性を示し、軸受から
の漏洩が少ない事が確認された。(Action) The alkyl diphenyl ether oil used in the present invention is
At high temperatures, has a sufficient viscosity, less oil at high temperatures than conventional synthetic oils, i.e., ester oils and poly-α-olefin oils, and has excellent oxidation stability and little sludge formation. A grease containing a terminal aromatic and terminal aromatic-based diurea compound as a thickener has good heat resistance and oxidation stability unique to urea grease, as well as good shear stability and adhesion. It was confirmed that there was little leakage from the bearing.
本発明のグリース組成物は、耐熱性、酸化安定性に優
れるアルキルジフェニルエーテルを必須成分とした基油
を使用し、増ちょう剤に耐熱性、酸化安定性、せん断安
定性、付着性に優れる末端芳香族および末端芳香族主体
のジウレア化合物を使用した事で、高温下で、長寿命で
ある事を可能にした。The grease composition of the present invention uses a base oil containing alkyldiphenyl ether as an essential component, which is excellent in heat resistance and oxidation stability, and is used as a thickener in heat resistance, oxidation stability, shear stability and terminal aroma with excellent adhesion. The use of a diurea compound mainly composed of an aromatic group and a terminal aromatic compound enables a long life at high temperatures.
（実施例） 以下、本発明を実施例により具体的に説明する。(Examples) Hereinafter, the present invention will be described specifically with reference to examples.
尚、各実施例および比較例において表１および２に示
す配合成分に基づいてグリースを製造し、次に示す方法
により物性を評価した。In each of the examples and comparative examples, greases were produced based on the components shown in Tables 1 and 2, and the physical properties were evaluated by the following methods.
（イ）ちょう度…JIS K 2220による。(A) Consistency: According to JIS K 2220.
（ロ）含水10％シェルロール…ASTM D 1831に従い、80
℃×168hrの試験を行い25℃における1/4混和ちょう度
（JIS K 2220）を測定する。今回は、促進条件としてグ
リース中に水を10％加え、試験を行った。(B) 10% water-containing shell roll: 80 in accordance with ASTM D 1831
Perform a test at ℃ 168 hr and measure the 1/4 mixing penetration (JIS K 2220) at 25 ° C. This time, the test was performed by adding 10% of water to the grease as the accelerating condition.
（ハ）軸受潤滑寿命…ASTM D 1741に従い、180℃にて試
験を行った。また、試験前後の軸受の重量を測定し、次
式により、グリース残存量を算出した。(C) Bearing lubrication life: Tested at 180 ° C according to ASTM D1741. The weight of the bearing before and after the test was measured, and the remaining amount of grease was calculated by the following equation.
実施例１〜５ 反応容器に、表１に示す基油の半量とモノアミン全量
をとり、70〜80℃に加温した。別容器に、基油半量とジ
イソシアネート全量をとり70〜80℃に加温し、これを反
応容器に加え攪拌した。発熱反応の為、反応物の温度は
上昇するが、約30分間、この状態で攪拌を続け、反応を
充分に行った後、昇温し175〜185℃で30分間保持し冷却
した。これを３段ロールミルで、混練し、目的のグリー
スを得た。 Examples 1 to 5 Half of the base oil and all of the monoamine shown in Table 1 were placed in a reaction vessel and heated to 70 to 80 ° C. In a separate container, half the amount of the base oil and the entire amount of the diisocyanate were heated to 70 to 80 ° C., added to the reaction container, and stirred. Although the temperature of the reaction product increased due to the exothermic reaction, stirring was continued in this state for about 30 minutes, and after the reaction was sufficiently performed, the temperature was raised, and the temperature was maintained at 175 to 185 ° C. for 30 minutes and cooled. This was kneaded with a three-stage roll mill to obtain the desired grease.
実施例６ 反応容器に、基油156.0gとオクタデシルアミン全量を
とり、70〜80℃に加温した。別容器に、基油156.0gとト
リレンジイソシアネート21.2gをとり70〜80℃に加温
し、これを反応容器に加え、攪拌した。約30分間、攪拌
を続けた後、これを昇温すると180〜200℃で、完全に溶
解するので、ただちに冷却し、３段ロールミルで混練し
た。これで得たグリース400gと実施例３で得たグリース
1600gを均一に混合し、３段ロールミルで、混練し、目
的のグリースを得た。Example 6 In a reaction vessel, 156.0 g of base oil and the whole amount of octadecylamine were placed and heated to 70 to 80 ° C. In a separate container, 156.0 g of base oil and 21.2 g of tolylene diisocyanate were heated to 70 to 80 ° C., added to a reaction container, and stirred. After the stirring was continued for about 30 minutes, the temperature was raised to 180 to 200 ° C. and completely dissolved, so it was immediately cooled and kneaded with a three-roll mill. 400 g of the grease thus obtained and the grease obtained in Example 3.
1600 g were uniformly mixed and kneaded with a three-stage roll mill to obtain a target grease.
比較例1,2,4 実施例１〜５と同一方法により、但し表２の配合成分
を用いて目的のグリースを得た。Comparative Examples 1, 2, 4 The desired grease was obtained in the same manner as in Examples 1 to 5, except that the components shown in Table 2 were used.
比較例３ 反応容器に、基油780.0gとオクタデシルアミン全量を
とり、70〜80℃に加温した。別容器に、基油780.0gとト
リレンジイソシアネート106.0gをとり70〜80℃に加温
し、これを反応容器に加え、攪拌した。約30分間、攪拌
を続けた後、これを昇温すると180〜200℃で、完全溶解
するので、ただちに冷却した。これを３段ロールミルで
混練し、目的のグリースを得た。Comparative Example 3 A reaction vessel was charged with 780.0 g of base oil and the whole amount of octadecylamine, and heated to 70 to 80 ° C. In a separate container, 780.0 g of the base oil and 106.0 g of tolylene diisocyanate were heated to 70 to 80 ° C., added to the reaction container, and stirred. After the stirring was continued for about 30 minutes, the temperature was raised to 180 to 200 ° C. and completely dissolved. This was kneaded with a three-stage roll mill to obtain the desired grease.
尚、実施例および、比較例に示されるアルキルジフェ
ニルエーテル油は、40℃の動粘度が123.0cSt、粘度指数
125、引火点284℃の性状を有する合成油、ペンタエリス
リトールエステル油は、40℃の動粘度が、29.6cSt、粘
度指数124、引火点254℃の性状を有する合成油を基油と
した。また使用したトリレンジイソシアネートは、2,4
−トリレンジイソシアネートと2,6−トリレンジイソシ
アネートが8:2である市販品を使用した。The alkyl diphenyl ether oils shown in Examples and Comparative Examples have a kinematic viscosity at 40 ° C. of 123.0 cSt and a viscosity index of 123.0 cSt.
125, a synthetic oil having properties of a flash point of 284 ° C., and pentaerythritol ester oil, a kinematic viscosity at 40 ° C. of 29.6 cSt, a viscosity index of 124, and a property of a flash point of 254 ° C. were used as base oils. The tolylene diisocyanate used was 2,4
A commercial product in which tolylene diisocyanate and 2,6-tolylene diisocyanate was 8: 2 was used.
実施例および、比較例をせん断安定性で整理すると、
増ちょう剤であるジウレア化合物の末端基が、芳香族系
が主体であるもの、即ち実施例１〜６と比較例４が良好
である。また、軸受潤滑寿命試験（180℃）における残
存量は実施例が全て良好である。比較例では、増ちょう
剤の耐熱性が不足しており、熱による軟化で、軸受外に
漏洩するもの（比較例1,3）や極度のチャネリング現象
で、軸受外に脱落が見られるもの（比較例２）が見られ
た。これらの現象は、潤滑寿命時間にも顕著に現れてい
る。比較例４は、増ちょう剤が、末端芳香族系のジウレ
ア化合物である為、せん断安定性、付着性が良かった
が、基油の蒸発、酸化が大きく、実施例より短寿命であ
った。 When the examples and comparative examples are arranged by shear stability,
Those in which the terminal group of the diurea compound as a thickener is mainly of an aromatic type, that is, Examples 1 to 6 and Comparative Example 4 are good. Further, the residual amount in the bearing lubrication life test (180 ° C.) is all good in Examples. In the comparative example, the heat resistance of the thickener was insufficient, and the thickener was softened by heat and leaked out of the bearing (Comparative Examples 1 and 3). Comparative Example 2) was observed. These phenomena are also noticeable in the lubrication life time. In Comparative Example 4, since the thickener was a terminal aromatic diurea compound, the shear stability and adhesion were good, but the evaporation and oxidation of the base oil were large, and the life was shorter than in the Examples.
（発明の効果） 以上説明から明らかなように本発明のグリース組成物
は、アルキルジフェニルエーテル油を必須成分とする基
油に特定のジウレア化合物を特定量配合したことによ
り、高温下で、蒸発、酸化が少なく、またせん断安定性
付着性に優れ、長寿命である事を可能ならしめた。(Effects of the Invention) As is clear from the above description, the grease composition of the present invention is characterized in that a specific amount of a specific diurea compound is blended with a base oil containing an alkyldiphenyl ether oil as an essential component, thereby evaporating and oxidizing at a high temperature. Low shear, excellent shear stability and excellent adhesion, and a long service life.
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ１０Ｎ 50:10 (72)発明者 遠藤 敏明 神奈川県藤沢市辻堂元町４―15―17 (56)参考文献 特開 昭54−113606（ＪＰ，Ａ)Continuation of the front page (51) Int.Cl. 6 Identification code FI C10N 50:10 (72) Inventor Toshiaki Endo 4-15-17 Tsujido Motomachi, Fujisawa-shi, Kanagawa (56) References JP-A-54-113606 (JP) , A)
Claims (1)
とする基油に、増ちょう剤として次の一般式 （式中のR2は炭素数６〜15の芳香族系炭化水素基、R1お
よびR3は炭素数６〜12の芳香族系炭化水素基または炭素
数８〜20の直鎖アルキル基で、かつR1およびR3中に占め
る芳香族系炭化水素基の割合が70〜100モル％である）
で表されるジウレア化合物を２〜35重量％配合したこと
を特徴とする高温で長寿命を有するグリース組成物。1. A base oil comprising an alkyldiphenyl ether oil as an essential component, and a thickener represented by the following general formula: (In the formula, R 2 is an aromatic hydrocarbon group having 6 to 15 carbon atoms, R 1 and R 3 are an aromatic hydrocarbon group having 6 to 12 carbon atoms or a linear alkyl group having 8 to 20 carbon atoms. And the proportion of the aromatic hydrocarbon group in R 1 and R 3 is 70 to 100 mol%)
A grease composition having a long life at a high temperature, characterized by containing 2 to 35% by weight of a diurea compound represented by the formula:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63086631A JP2764724B2 (en) | 1988-04-08 | 1988-04-08 | Grease composition with long life at high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63086631A JP2764724B2 (en) | 1988-04-08 | 1988-04-08 | Grease composition with long life at high temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01259097A JPH01259097A (en) | 1989-10-16 |
| JP2764724B2 true JP2764724B2 (en) | 1998-06-11 |
Family
ID=13892376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63086631A Expired - Lifetime JP2764724B2 (en) | 1988-04-08 | 1988-04-08 | Grease composition with long life at high temperature |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2764724B2 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03250094A (en) * | 1990-02-28 | 1991-11-07 | Ntn Corp | Grease-filled gearing for electrical equipment and auxiliary machinery of vehicle |
| US5569643A (en) * | 1991-03-07 | 1996-10-29 | Nippon Oil Co., Ltd. | Grease composition for constant velocity joint |
| US5282689A (en) * | 1991-09-20 | 1994-02-01 | Nsk Ltd. | Rolling bearing |
| US5385412A (en) * | 1991-09-20 | 1995-01-31 | Nsk Ltd. | Rolling bearing |
| JP3519417B2 (en) * | 1991-10-04 | 2004-04-12 | 協同油脂株式会社 | Grease composition for bearings with excellent low starting torque for high temperature, high speed and high load application |
| IT1263745B (en) * | 1992-01-22 | 1996-08-27 | Ntn Toyo Bearing Co Ltd | CONTACT ROLLING BEARING CLOSED WITH GREASE |
| JP2544560B2 (en) * | 1992-01-22 | 1996-10-16 | エヌティエヌ株式会社 | Grease composition for bearing encapsulation |
| JP2557597B2 (en) * | 1992-01-22 | 1996-11-27 | エヌティエヌ株式会社 | Rolling bearing with grease for alternator |
| JP2979274B2 (en) * | 1992-06-29 | 1999-11-15 | 日本精工株式会社 | Grease composition for high-speed rolling bearings |
| JP3337593B2 (en) * | 1995-06-22 | 2002-10-21 | 日本精工株式会社 | Grease composition for rolling bearings |
| DE19749979C2 (en) * | 1997-11-05 | 2000-01-13 | Schering Ag | Medicaments containing N, N'-substituted ureas and their derivatives |
| JP4620219B2 (en) * | 2000-06-02 | 2011-01-26 | Ｊｘ日鉱日石エネルギー株式会社 | Grease composition |
| JP4883743B2 (en) | 2002-08-02 | 2012-02-22 | Ｎｔｎ株式会社 | Grease composition and bearing containing the grease composition |
| JP5727276B2 (en) | 2011-03-04 | 2015-06-03 | 協同油脂株式会社 | Grease composition and grease-filled rolling bearing |
| US9567545B2 (en) | 2011-07-28 | 2017-02-14 | Nsk Ltd. | Grease composition for EV/HEV driving motor bearing and EV/HEV driving motor bearing |
| JP2016014087A (en) * | 2014-07-01 | 2016-01-28 | Ntn株式会社 | Lubricant composition and lubricant composition sealed bearing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6386631A (en) * | 1986-09-30 | 1988-04-18 | Nec Corp | Address filtering method |
-
1988
- 1988-04-08 JP JP63086631A patent/JP2764724B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01259097A (en) | 1989-10-16 |
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