JP2019048935A - Grease composition and grease-sealed rolling bearing - Google Patents

Grease composition and grease-sealed rolling bearing Download PDF

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JP2019048935A
JP2019048935A JP2017173406A JP2017173406A JP2019048935A JP 2019048935 A JP2019048935 A JP 2019048935A JP 2017173406 A JP2017173406 A JP 2017173406A JP 2017173406 A JP2017173406 A JP 2017173406A JP 2019048935 A JP2019048935 A JP 2019048935A
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oil
mass
base oil
grease composition
kinematic viscosity
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元博 伊藤
Motohiro Ito
元博 伊藤
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to PCT/JP2018/033131 priority patent/WO2019049963A1/en
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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
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/18—Ethers, e.g. epoxides
    • 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
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02—Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To provide a grease composition capable of suppressing occurrence of abnormal noise at a low temperature even under an ultra-low temperature condition lower than -20°C.SOLUTION: A grease composition 7 comprises: base oil comprising mixed oil of ether oil and poly-α-olefin oil, and thickener, wherein the ether oil has a kinematic viscosity of 20 to 40 mm/s at 40°C, the poly-α-olefin oil has a kinematic viscosity of 30 to 50 mm/s at 40°C and is contained in an amount of 20 to 40 mass% based on whole base oil, or the poly-α-olefin oil has the kinematic viscosity of 5 mm/s or more to less than 30 mm/s at 40°C and is contained in the amount of 10 to 40 mass% based on the whole base oil, and the thickener is an alicyclic diurea compound and is contained in the amount of 10 mass% or more to 18 mass% or less based on a total amount of the base oil and the thickener.SELECTED DRAWING: Figure 1

Description

本発明は、各種産業機械や車両に組み込まれる転がり軸受に封入されるグリース組成物に関し、特に冷時異音が発生する超低温において使用される転がり軸受に好適なグリース組成物に関する。   The present invention relates to a grease composition sealed in rolling bearings incorporated in various industrial machines and vehicles, and more particularly to a grease composition suitable for rolling bearings used at an extremely low temperature at which cold noise is generated.

各種産業機械や車両などに組み込まれる転がり軸受には、潤滑性を付与するためにグリース組成物が封入されている。この転がり軸受は、例えば、自動車の動力伝達系に設けられるプーリ等にも組み込まれている。このようなプーリを、寒冷地などの低温（０℃など）にさらされた状況下で作動させると、作動直後に異音が発生することがある。この寒冷時に発生する異音を冷時異音と呼ぶ。   A grease composition is enclosed in a rolling bearing incorporated in various industrial machines, vehicles and the like in order to impart lubricity. The rolling bearing is also incorporated in, for example, a pulley provided in a power transmission system of a car. If such a pulley is operated under conditions exposed to a low temperature (such as 0 ° C.) such as a cold area, abnormal noise may occur immediately after the operation. The abnormal noise generated at the time of cold is called cold abnormal noise.

冷時異音が発生する原因はいまだ解明されていないが、転がり軸受に封入されたグリース組成物が固化することによって発生すると考えられている。この考えに基づき、低温下でも流動性の良好な基油を含むグリース組成物を用いることで、冷時異音の発生を抑制する技術が提案されている（例えば、特許文献１参照）。   The cause of the generation of abnormal noise during cold weather has not been elucidated yet, but is considered to be caused by solidification of the grease composition enclosed in the rolling bearing. Based on this idea, there has been proposed a technique for suppressing the generation of abnormal noise at the time of cold by using a grease composition containing a base oil having good fluidity even at low temperatures (see, for example, Patent Document 1).

特開２００６−２４９２７１号公報Unexamined-Japanese-Patent No. 2006-249271

上記の特許文献１では、低温条件として−２０℃を想定しており、各グリース組成物についてその温度での冷時異音の発生の有無を検討している。しかしながら、極寒冷地などでは、−２０℃よりもさらに低い超低温条件（−４０℃など）となる場合がある。そのため、転がり軸受が超低温条件で使用された場合であっても、冷時異音の発生が抑制されることが望ましい。   In the above Patent Document 1, -20 ° C. is assumed as the low temperature condition, and the presence or absence of occurrence of cold abnormal noise at each temperature is examined for each grease composition. However, in extremely cold regions, there may be cases where ultra-low temperature conditions (such as -40.degree. C.) which are even lower than -20.degree. Therefore, it is desirable that the occurrence of cold abnormal noise be suppressed even when the rolling bearing is used under ultra-low temperature conditions.

本発明は上記事情に鑑みてなされたものであり、−２０℃よりもさらに低い超低温条件下であっても、冷時異音の発生を抑制することができるグリース組成物を提供することを目的とする。また、そのグリース組成物が封入された転がり軸受を提供することを目的とする。   The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a grease composition capable of suppressing the occurrence of abnormal noise even under ultra-low temperature conditions lower than -20 ° C. I assume. Another object of the present invention is to provide a rolling bearing in which the grease composition is enclosed.

本発明のグリース組成物は、エーテル油およびポリ−α−オレフィン油の混合油からなる基油と、増ちょう剤とを含むグリース組成物であって、上記エーテル油は、４０℃における動粘度が２０〜４０ｍｍ2／ｓであり、上記ポリ−α−オレフィン油が、該ポリ−α−オレフィン油の４０℃における動粘度が３０〜５０ｍｍ2／ｓであり、上記基油全体に対して２０〜４０質量％含まれるか、または、該ポリ−α−オレフィン油の４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満であり、上記基油全体に対して１０〜４０質量％含まれ、上記増ちょう剤は、脂環式ジウレア化合物であり、上記基油と上記増ちょう剤との合計量に対して１０質量％以上１８質量％未満含まれることを特徴とする。 The grease composition of the present invention is a grease composition comprising a base oil comprising a mixed oil of an ether oil and a poly-α-olefin oil, and a thickener, wherein the ether oil has a kinematic viscosity at 40 ° C. 20~40mm a 2 / s, the poly -α- olefin oil, kinematic viscosity at 40 ° C. of the poly -α- olefin oil is 30 to 50 mm 2 / s,. 20 to for the entire above base oil 40% by mass, or the kinematic viscosity at 40 ° C. of the poly-α-olefin oil is 5 mm 2 / s or more and less than 30 mm 2 / s, and 10 to 40% by mass with respect to the whole base oil The thickener is an alicyclic diurea compound, and is contained in an amount of 10% by mass to less than 18% by mass with respect to the total amount of the base oil and the thickener.

本発明のグリース組成物は、エーテル油およびポリ−α−オレフィン油の混合油からなる基油と、増ちょう剤とを含むグリース組成物であって、上記エーテル油は、４０℃における動粘度が６０〜１１０ｍｍ2／ｓであり、上記ポリ−α−オレフィン油が、該ポリ−α−オレフィン油の４０℃における動粘度が３０〜３５ｍｍ2／ｓであり、上記基油全体に対して３０〜４０質量％含まれるか、または、該ポリ−α−オレフィン油の４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満であり、上記基油全体に対して２０〜４０質量％含まれ、上記増ちょう剤は、脂環式ジウレア化合物であり、上記基油と上記増ちょう剤との合計量に対して１０質量％以上１８質量％未満含まれることを特徴とする。 The grease composition of the present invention is a grease composition comprising a base oil comprising a mixed oil of an ether oil and a poly-α-olefin oil, and a thickener, wherein the ether oil has a kinematic viscosity at 40 ° C. 60-110 mm 2 / s, and the above-mentioned poly-α-olefin oil has a dynamic viscosity of 30-35 mm 2 / s at 40 ° C. of the poly-α-olefin oil, and 30 to 30 with respect to the whole base oil 40% by mass, or the kinematic viscosity at 40 ° C. of the poly-α-olefin oil is 5 mm 2 / s or more and less than 30 mm 2 / s, and 20 to 40% by mass with respect to the whole base oil The thickener is an alicyclic diurea compound, and is contained in an amount of 10% by mass to less than 18% by mass with respect to the total amount of the base oil and the thickener.

上記エーテル油が、アルキルジフェニルエーテル油であることを特徴とする。   The ether oil is characterized in that it is an alkyl diphenyl ether oil.

本発明のグリース封入転がり軸受は、グリース組成物を封入してなるグリース封入転がり軸受であって、上記グリース組成物が、本発明のグリース組成物であることを特徴とする。   The grease-sealed rolling bearing of the present invention is a grease-sealed rolling bearing formed by sealing a grease composition, and the above-mentioned grease composition is the grease composition of the present invention.

自動車用電装補機に用いられ、該自動車用電装補機がファンカップリング装置、オルタネータ、アイドラプーリ、テンションプーリ、電磁クラッチ、またはコンプレッサであることを特徴とする。   It is used for an automotive electrical accessory, and the automotive electrical accessory is a fan coupling device, an alternator, an idler pulley, a tension pulley, an electromagnetic clutch, or a compressor.

本発明のグリース組成物は、エーテル油およびポリ−α−オレフィン油の混合油からなる基油と、増ちょう剤とを含み、エーテル油とポリ−α−オレフィン油のそれぞれの動粘度に応じて基油における各配合量が適正化されているとともに、基油と増ちょう剤との合計量に対する脂環式ジウレア化合物の配合量も適正化されているので、−２０℃未満の超低温条件で使用される場合であっても適度な流動性を有し、冷時異音を抑制することができる。   The grease composition of the present invention comprises a base oil consisting of a mixture of an ether oil and a poly-α-olefin oil, and a thickener, depending on the kinematic viscosity of each of the ether oil and the poly-α-olefin oil. Since each compounding amount in the base oil is optimized, and the compounding amount of the alicyclic diurea compound with respect to the total amount of the base oil and the thickener is also optimized, it is used under ultra-low temperature conditions less than -20 ° C Even in the case where it is used, it has appropriate fluidity, and cold abnormal noise can be suppressed.

エーテル油がアルキルジフェニルエーテル油であるので、耐冷時異音特性を備えつつ、高温での耐久性にも優れる。   Since the ether oil is an alkyl diphenyl ether oil, it is excellent in durability at high temperature while being provided with abnormal noise resistance during cold.

本発明のグリース封入転がり軸受は、本発明のグリース組成物を封入しているので、−２０℃未満の超低温条件で使用される場合であっても、冷時異音を抑制することができる。また、自動車用電装補機であるファンカップリング装置、オルタネータ、アイドラプーリ、テンションプーリ、電磁クラッチ、またはコンプレッサにグリース封入軸受を適用する場合、幅広い温度環境下で使用され、−２０℃未満の超低温条件下での使用も想定される。本発明のグリース封入転がり軸受は、優れた耐冷時異音特性を備えているので、これらの用途に好適に利用できる。   Since the grease-sealed rolling bearing of the present invention encloses the grease composition of the present invention, cold noise can be suppressed even when used under ultra-low temperature conditions of less than -20 ° C. Also, when applying grease filled bearings to fan coupling devices, alternators, idler pulleys, tension pulleys, electromagnetic clutches, or compressors that are electrical equipment auxiliary equipment for automobiles, they are used under a wide range of temperature environments and have extremely low temperatures of less than -20 ° C. Use under conditions is also envisioned. The grease-sealed rolling bearing according to the present invention has excellent cold noise resistance, and therefore can be suitably used for these applications.

本実施形態に係る深溝玉軸受の断面図である。It is a sectional view of a deep groove ball bearing concerning this embodiment. 各温度下における音圧の測定結果を示す図である。It is a figure which shows the measurement result of the sound pressure under each temperature.

一般にグリース組成物が封入された転がり軸受を低温下で使用する際には、冷時異音が問題となる。本発明における冷時異音としては、始動時のわずかな時間において発生する物体が剥がれるような音であるジャリ音を対象とする。この冷時異音は、転がり軸受の使用温度が低温になればなるほど、発生する可能性が高くなる。本発明のグリース組成物は、低温下で使用されることを想定しており、例えば−２０℃未満の低温下で使用され、好ましくは−３０℃以下の低温下で使用され、より好ましくは−４０℃以下の低温下で使用される。なお、本発明において−２０℃未満の低温を超低温ともいう。   In general, when using a rolling bearing in which a grease composition is enclosed at low temperature, cold abnormal noise becomes a problem. As the cold abnormal noise in the present invention, a javelin sound which is a sound that an object generated in a short time at the start is peeled off is targeted. This cold abnormal noise is more likely to occur as the operating temperature of the rolling bearing becomes lower. The grease composition of the present invention is assumed to be used at a low temperature, for example, used at a low temperature of less than -20.degree. C., preferably at a temperature of -30.degree. C. or less, more preferably- Used at low temperatures of 40 ° C or less. In the present invention, a low temperature of less than -20 ° C is also referred to as an ultra low temperature.

本発明者らは、超低温下でも冷時異音の発生を抑制するべく、グリース組成物について検討した。グリース組成物の基油には、一般に広く使用され耐熱性にも優れるエーテル油を用い、該エーテル油をベースとしながらも冷時異音が抑制できる基油を検討した。その結果、エーテル油に低動粘度のＰＡＯ油を所定量添加することで、冷時異音を抑制できることが分かった。さらに、より低動粘度のエーテル油およびＰＡＯ油を用いることで、基油全体におけるエーテル油の含有量を高めつつ、冷音異音を抑制できることが分かった。つまり、本発明者らは、エーテル油およびＰＡＯ油からなる基油を含むグリース組成物において、エーテル油の動粘度とＰＡＯ油の動粘度と各油の混合比とが、冷時異音の抑制に重要であることを見出した。本発明はこのような知見に基づくものである。   The present inventors examined a grease composition in order to suppress the occurrence of cold abnormal noise even at extremely low temperatures. As a base oil of the grease composition, an ether oil which is generally used widely and which is excellent in heat resistance was used, and a base oil capable of suppressing abnormal noise while being based on the ether oil was examined. As a result, it was found that by adding a predetermined amount of low dynamic viscosity PAO oil to ether oil, it is possible to suppress cold abnormal noise. Furthermore, it was found that by using an ether oil and a PAO oil having a lower kinematic viscosity, it is possible to suppress cold noise while increasing the content of the ether oil in the whole base oil. That is, in the grease composition containing a base oil consisting of an ether oil and a PAO oil, the inventors of the present invention suppress the abnormal noise during cooling of the kinematic viscosity of the ether oil, the kinematic viscosity of the PAO oil, and the mixing ratio of each oil Found to be important. The present invention is based on such findings.

本発明のグリース組成物は、基油と増ちょう剤とを含む。基油は、エーテル油とポリ−α−オレフィン油（ＰＡＯ油）のみからなる混合油であり、エーテル油を主成分とする。   The grease composition of the present invention comprises a base oil and a thickener. The base oil is a mixed oil consisting only of ether oil and poly-α-olefin oil (PAO oil), and is mainly composed of ether oil.

エーテル油としては、例えば、ポリフェニルエーテル油、アルキルジフェニルエーテル油、アルキルトリフェニルエーテル油、アルキルテトラフェニルエーテル油などが挙げられる。これらの中でも、高温での耐久性の点から、アルキルジフェニルエーテル油が好ましい。 アルキルジフェニルエーテル油としては、モノアルキルジフェニルエーテル油、ジアルキルジフェニルエーテル油、ポリアルキルジフェニルエーテルなどが挙げられる。   Examples of the ether oil include polyphenyl ether oil, alkyl diphenyl ether oil, alkyl triphenyl ether oil, alkyl tetraphenyl ether oil and the like. Among these, alkyl diphenyl ether oils are preferable in terms of durability at high temperatures. As the alkyl diphenyl ether oil, mono alkyl diphenyl ether oil, dialkyl diphenyl ether oil, polyalkyl diphenyl ether and the like can be mentioned.

ＰＡＯ油は、α−オレフィンまたは異性化されたα−オレフィンのオリゴマーまたはポリマーの混合物である。α−オレフィンの具体例としては、１−オクテン、１−ノネン、１−デセン、１−ドデセン、１−トリデセン、１−テトラデセン、１−ペンタデセン、１−ヘキサデセン、１−ヘプタデセン、１−オクタデセン、１−ノナデセン、１−エイコセン、１−ドコセン、１−テトラドコセンなどが挙げられ、通常はこれらの混合物が使用される。   PAO oils are mixtures of oligomers or polymers of alpha-olefins or isomerized alpha-olefins. Specific examples of α-olefins include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1 -Nonadecene, 1-eicosene, 1-docosene, 1-tetradocosene etc. are mentioned, and usually these mixtures are used.

本発明に用いられる基油は エーテル油を主成分として含むので、エーテル油の含有量は基油（混合油）全体に対して５０質量％以上であり、好ましくは５５〜９５質量％であり、より好ましくは６０〜９０質量％であり、さらに好ましくは７０〜９０質量％である。この場合、基油の残部はＰＡＯ油であり、ＰＡＯ油の含有量は、基油全体に対して５０質量％未満であり、好ましくは５〜４５質量％であり、より好ましくは１０〜４０質量％であり、さらに好ましくは１０〜３０質量％である。   Since the base oil used in the present invention contains an ether oil as a main component, the content of the ether oil is 50% by mass or more, preferably 55 to 95% by mass, based on the whole base oil (mixed oil), More preferably, it is 60-90 mass%, More preferably, it is 70-90 mass%. In this case, the balance of the base oil is PAO oil, and the content of PAO oil is less than 50% by mass, preferably 5 to 45% by mass, and more preferably 10 to 40% by mass with respect to the whole base oil. %, More preferably 10 to 30% by mass.

基油に用いられるエーテル油は、４０℃における動粘度が２０〜１１０ｍｍ2／ｓである。このうち、基油の１つの形態としては、４０℃における動粘度が２０〜４０ｍｍ2／ｓのエーテル油が用いられる。さらに、該動粘度は２５〜３５ｍｍ2／ｓであることが好ましく、３０〜３５ｍｍ2／ｓであることがより好ましい。また、基油の他の形態としては、４０℃における動粘度が６０〜１１０ｍｍ2／ｓのエーテル油が用いられる。さらに、該動粘度は６５〜１０５ｍｍ2／ｓであることが好ましく、６５〜７０ｍｍ2／ｓであることがより好ましい。 Ether oil used for base oil has a kinematic viscosity at 40 ° C. of 20 to 110 mm 2 / s. Among them, an ether oil having a kinematic viscosity of 20 to 40 mm 2 / s at 40 ° C. is used as one form of the base oil. Further, it is preferable that kinematic viscosity is 25 to 35 mm 2 / s, more preferably 30 to 35 mm 2 / s. In addition, as another form of the base oil, an ether oil having a kinematic viscosity of 60 to 110 mm 2 / s at 40 ° C. is used. Further, it is preferable that kinematic viscosity is 65~105mm 2 / s, more preferably 65~70mm 2 / s.

基油に用いられるＰＡＯ油は、４０℃における動粘度が５〜５０ｍｍ2／ｓである。このうち、基油の１つの形態としては、４０℃における動粘度が３０〜５０ｍｍ2／ｓのＰＡＯ油が用いられる。さらに、該動粘度は３０〜４０ｍｍ2／ｓであることが好ましく、３０〜３５ｍｍ2／ｓであることがより好ましい。また、基油の他の形態としては、４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満のＰＡＯ油が用いられる。さらに、該動粘度は１０〜２５ｍｍ2／ｓであることが好ましく、１５〜２０ｍｍ2／ｓであることがより好ましい。 The PAO oil used for the base oil has a kinematic viscosity at 40 ° C. of 5 to 50 mm 2 / s. Among them, as one form of base oil, PAO oil having a kinematic viscosity of 30 to 50 mm 2 / s at 40 ° C. is used. Further, it is preferable that kinematic viscosity is 30 to 40 mm 2 / s, more preferably 30 to 35 mm 2 / s. Moreover, as another form of base oil, PAO oil whose kinematic viscosity at 40 ° C. is 5 mm 2 / s or more and less than 30 mm 2 / s is used. Further, it is preferable that kinematic viscosity is 10 to 25 mm 2 / s, more preferably 15 to 20 mm 2 / s.

本発明に用いられる基油は、４０℃における動粘度が上記の各数値範囲に属するエーテル油と、４０℃における動粘度が上記の各数値範囲に属するＰＡＯ油とをそれぞれ組み合わせて構成される。以上を考慮して、基油の特に好ましい形態を以下に示す。   The base oil used in the present invention is configured by combining an ether oil whose kinematic viscosity at 40 ° C. falls within each of the above-mentioned numerical ranges and a PAO oil whose kinematic viscosity at 40 ° C. falls within each of the above-mentioned respective numerical ranges. In view of the above, a particularly preferred form of base oil is shown below.

（１）基油Ａ：４０℃における動粘度が２０〜４０ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して６０〜８０質量％含み、４０℃における動粘度が３０〜５０ｍｍ2／ｓのＰＡＯ油を基油全体に対して２０〜４０質量％含む。さらに、基油Ａにおいて、４０℃における動粘度が２５〜３５ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して７０〜８０質量％含み、４０℃における動粘度が３０〜４０ｍｍ2／ｓのＰＡＯ油を基油全体に対して２０〜３０質量％含む形態がより好ましい。 (1) Base Oil A: kinematic viscosity at 40 ℃ comprises 60 to 80 wt% of alkyl diphenyl ether oil 20 to 40 mm 2 / s for the whole base oil, kinematic viscosity at 40 ℃ is 30 to 50 mm 2 / s PAO oil is contained in an amount of 20 to 40% by mass based on the whole base oil. Further, in the base oil A, kinematic viscosity at 40 ℃ comprises 70-80 wt% of alkyl diphenyl ether oil 25 to 35 mm 2 / s for the whole base oil, kinematic viscosity at 40 ℃ is 30 to 40 mm 2 / s More preferred is a form containing 20 to 30% by mass of PAO oil based on the whole base oil.

（２）基油Ｂ：４０℃における動粘度が２０〜４０ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して６０〜９０質量％含み、４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満のＰＡＯ油を基油全体に対して１０〜４０質量％含む。さらに、基油Ｂにおいて、４０℃における動粘度が２５〜３５ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して８０〜９０質量％含み、４０℃における動粘度が１０〜２５ｍｍ2／ｓのＰＡＯ油を基油全体に対して１０〜２０質量％含む形態がより好ましい。 (2) Base Oil B: 40 contains 60 to 90% by weight, based on the total base oil kinematic viscosity of the alkyl diphenyl ether oil 20 to 40 mm 2 / s at ° C., 40 kinematic viscosity at ° C. is 5 mm 2 / s or more 30 mm 2 It contains 10 to 40% by mass of PAO oil less than 1 / s based on the whole base oil. Further, in the base oil B, kinematic viscosity at 40 ℃ comprises 80 to 90 wt% of alkyl diphenyl ether oil 25 to 35 mm 2 / s for the whole base oil, kinematic viscosity at 40 ℃ is 10 to 25 mm 2 / s More preferred is a form containing 10 to 20% by mass of PAO oil based on the whole base oil.

（３）基油Ｃ：４０℃における動粘度が６０〜１１０ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して６０〜７０質量％含み、４０℃における動粘度が３０〜３５ｍｍ2／ｓのＰＡＯ油を基油全体に対して３０〜４０質量％含む。 (3) Base Oil C: kinematic viscosity at 40 ° C. comprises 60 to 70% by weight, based on the total base oil alkyl diphenyl ether oil 60~110mm 2 / s, 40 kinematic viscosity at ° C. of 30 to 35 mm 2 / s PAO oil is contained in an amount of 30 to 40% by mass based on the entire base oil.

（４）基油Ｄ：４０℃における動粘度が６０〜１１０ｍｍ2／ｓのアルキルジフェニルエーテル油を基油全体に対して６０〜８０質量％含み、４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満のＰＡＯ油を基油全体に対して２０〜４０質量％含む。 (4) Base Oil D: kinematic viscosity at 40 ° C. comprises 60 to 80% by weight, based on the total base oil alkyl diphenyl ether oil 60~110mm 2 / s, kinematic viscosity at 40 ° C. is 5 mm 2 / s or more 30 mm 2 20 to 40 mass% of PAO oil less than 1 / s with respect to the whole base oil.

増ちょう剤としては、脂環式ジウレア化合物が用いられる。脂環式ジウレア化合物は、ジイソシアネート成分とモノアミン成分とを反応して得られる。ジイソシアネート成分としては、フェニレンジイソシアネート、トリレンジイソシアネート、ジフェニルジイソシアネート、ジフェニルメタンジイソシアネート（ＭＤＩ）、オクタデカンジイソシアネート、デカンジイソシアネート、ヘキサンジイソシアネー卜などが挙げられる。これらのうち、芳香族ジイソシアネートがより好ましい。また、モノアミン成分としては脂環式モノアミンが用いられ、例えば、シクロヘキシルアミン、シクロペンチルアミンなどが挙げられる。   As a thickening agent, an alicyclic diurea compound is used. An alicyclic diurea compound is obtained by reacting a diisocyanate component with a monoamine component. Examples of the diisocyanate component include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate (MDI), octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, and the like. Among these, aromatic diisocyanates are more preferred. In addition, as a monoamine component, an alicyclic monoamine is used, and examples thereof include cyclohexylamine and cyclopentylamine.

上述した基油に増ちょう剤としての脂環式ジウレア化合物を配合してグリース組成物が得られる。このグリース組成物は、基油中でジイソシアネート成分とモノアミン成分とを反応させて作製する。基油および増ちょう剤の合計量に対する増ちょう剤の含有量は、１０質量％以上１８質量％未満であり、好ましくは１０〜１５質量％である。増ちょう剤の含有量が１８質量％をこえると、冷時異音の抑制が困難となるおそれがある。   A grease composition is obtained by blending the above-mentioned base oil with an alicyclic diurea compound as a thickener. The grease composition is prepared by reacting a diisocyanate component and a monoamine component in a base oil. The content of the thickener relative to the total amount of the base oil and the thickener is 10% by mass or more and less than 18% by mass, preferably 10% by mass to 15% by mass. If the content of the thickening agent exceeds 18% by mass, it may be difficult to suppress cold noise.

グリース組成物の混和ちょう度（ＪＩＳ Ｋ ２２２０）は、２００〜３５０の範囲にあることが好ましい。ちょう度が２００未満である場合は、油分離が小さく潤滑不良となるおそれがある。一方、ちょう度が３５０をこえる場合は、グリース組成物が軟質で軸受外に流出しやすくなり好ましくない。   The worked penetration (JIS K 2220) of the grease composition is preferably in the range of 200 to 350. If the consistency is less than 200, oil separation may be small, resulting in poor lubrication. On the other hand, when the consistency is more than 350, the grease composition is soft and is likely to flow out of the bearing, which is not preferable.

また、グリース組成物には、必要に応じて公知の添加剤を添加できる。添加剤としては、例えば、有機亜鉛化合物、有機モリブデン化合物などの極圧剤、アミン系、フェノール系、イオウ系化合物などの酸化防止剤、イオウ系、リン系化合物などの摩耗防止剤、多価アルコールエステルなどの防錆剤、二硫化モリブデン、グラファイトなどの摩擦低減剤、エステル、アルコールなどの油性剤などが挙げられる。   In addition, known additives can be added to the grease composition as needed. Additives include, for example, extreme pressure agents such as organic zinc compounds and organic molybdenum compounds, antioxidants such as amines, phenols and sulfur compounds, antiwear agents such as sulfur and phosphorus compounds, polyhydric alcohols Antirust agents such as esters, friction reducing agents such as molybdenum disulfide and graphite, and oil agents such as esters and alcohols.

本発明のグリース組成物が封入された転がり軸受の一例を図１に基づいて説明する。図１は深溝玉軸受の断面図である。転がり軸受１は、外周面に内輪転走面２ａを有する内輪２と内周面に外輪転走面３ａを有する外輪３とが同心に配置され、内輪転走面２ａと外輪転走面３ａとの間に複数個の転動体４が配置される。この転動体４は、保持器５により保持される。また、内・外輪の軸方向両端開口部８ａ、８ｂがシール部材６によりシールされ、少なくとも転動体４の周囲にグリース組成物７が封入される。内輪２、外輪３および転動体４は鉄系金属材料からなり、グリース組成物７が転動体４との転走面に介在して潤滑される。   An example of a rolling bearing in which the grease composition of the present invention is sealed will be described based on FIG. FIG. 1 is a cross-sectional view of a deep groove ball bearing. In the rolling bearing 1, the inner ring 2 having the inner ring rolling surface 2a on the outer peripheral surface and the outer ring 3 having the outer ring rolling surface 3a on the inner peripheral surface are concentrically arranged. The inner ring rolling surface 2a and the outer ring rolling surface 3a A plurality of rolling elements 4 are disposed between the two. The rolling element 4 is held by the cage 5. Further, the axial end openings 8 a and 8 b of the inner and outer rings are sealed by the seal member 6, and the grease composition 7 is enclosed at least around the rolling element 4. The inner ring 2, the outer ring 3 and the rolling element 4 are made of an iron-based metal material, and the grease composition 7 is lubricated by being interposed on the rolling surface with the rolling element 4.

図１では転がり軸受として玉軸受について例示したが、本発明の転がり軸受は、上記以外の円筒ころ軸受、円すいころ軸受、自動調心ころ軸受、針状ころ軸受、スラスト円筒ころ軸受、スラスト円すいころ軸受、スラスト針状ころ軸受、スラスト自動調心ころ軸受などとしても使用できる。   Although FIG. 1 illustrates ball bearings as rolling bearings, the rolling bearings of the present invention are cylindrical roller bearings other than those described above, tapered roller bearings, self-aligning roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust tapered rollers It can also be used as a bearing, thrust needle roller bearing, thrust spherical roller bearing, etc.

本発明の転がり軸受は、−２０℃未満の超低温条件でも冷時異音を発生しないため、極寒冷地などで使用される転がり軸受に適している。特に、本発明の転がり軸受は、幅広い温度環境下で使用される自動車用電装補機に適している。自動車電装用補機としては、ファンカップリング装置、オルタネータ、アイドラプーリ、テンションプーリ、電磁クラッチ、コンプレッサ等が挙げられる。   The rolling bearing of the present invention is suitable for rolling bearings used in extremely cold regions and the like because it does not generate cold noise even under ultra-low temperature conditions of less than -20 ° C. In particular, the rolling bearing of the present invention is suitable for an automotive electrical accessory used in a wide temperature environment. As an accessory for automobile electrical equipment, a fan coupling device, an alternator, an idler pulley, a tension pulley, an electromagnetic clutch, a compressor, etc. may be mentioned.

実施例１〜９および比較例１〜２０について、表１および表２に示す配合組成（質量％）で基油および増ちょう剤を混合してグリース組成物を得た。表１および表２に示すエーテル油およびＰＡＯ油の質量％は、基油全体に対する各油の質量％であり、増ちょう剤の質量％は、基油および増ちょう剤の合計量における質量％である。なお、表１下記の１）〜７）は、表２においても同じである。得られた各グリース組成物を軸受（ＮＴＮ社製６２０３）に０．７ｇ封入して、試験用軸受を得た。   The base oil and the thickener were mixed with the composition (mass%) shown in Table 1 and Table 2 for Examples 1 to 9 and Comparative Examples 1 to 20 to obtain a grease composition. The weight% of ether oil and PAO oil shown in Table 1 and Table 2 is the weight% of each oil with respect to the whole base oil, and the weight% of thickener is the weight% in the total amount of base oil and thickener is there. The following 1) to 7) in Table 1 are the same in Table 2. Each of the obtained grease compositions was sealed in a bearing (6203 manufactured by NTN) to obtain a test bearing.

得られた試験用軸受を各試験温度（−４０℃、２０℃）下で回転させて、音圧をそれぞれ測定した。試験温度−４０℃の場合は、試験用軸受を−５０℃で１時間冷却した後、試験機に組み付け、−４０℃になってから運転を開始した。試験では、開始３０秒間で７０００ｍｉｎ-1まで試験用軸受を回転させた。 The sound pressure was measured by rotating the obtained test bearing under each test temperature (-40 degreeC, 20 degreeC). In the case of a test temperature of -40 ° C, the test bearing was cooled at -50 ° C for 1 hour, then assembled into a tester, and the operation started after reaching -40 ° C. In the test, the test bearing was rotated to 7000 min- 1 with a start time of 30 seconds.

図２には、各試験温度下における音圧の時間変化を示す。図２に示すように、−４０℃では、運転開始後のわずかな時間（約７〜１３秒の間）に音圧が一時的に上昇しており、この上昇した音圧が冷時異音となる。一方、２０℃ではこの音圧上昇は見られない。そのため、−４０℃の音圧と２０℃の音圧との差分（音圧差）が大きいほど冷時異音が大きいといえる。実施例１〜９および比較例１〜２０について、この音圧差を求め、各値を表１および表２に併記した。なお、音圧差は、−４０℃での音圧から２０℃での音圧を引いた値の運転時間（５０ｓ）における総和に、測定間隔（０．１ｓ）を乗算して求めた。   The time change of the sound pressure under each test temperature is shown in FIG. As shown in FIG. 2, at −40 ° C., the sound pressure is temporarily increased for a short time (about 7 to 13 seconds) after the start of operation, and the increased sound pressure is abnormal noise during cold It becomes. On the other hand, this sound pressure rise is not seen at 20 ° C. Therefore, it can be said that the cold abnormal noise is larger as the difference (sound pressure difference) between the sound pressure at -40 ° C and the sound pressure at 20 ° C is larger. This sound pressure difference was determined for Examples 1 to 9 and Comparative Examples 1 to 20, and the respective values are shown in Table 1 and Table 2. In addition, the sound pressure difference calculated | required by multiplying the measurement space | interval (0.1 s) by the total in the driving time (50 s) of the value which deducted the sound pressure in 20 degreeC from the sound pressure in -40 degreeC.

また、試験では試験者の聴覚により冷時異音の発生の有無を評価した。各試験例について、冷時異音が発生しなかった場合を〇、冷時異音が発生した場合を×とした。なお、冷時異音の発生の有無は音圧差の数値と相関しており、音圧差が１０以下（負値も含む）の場合には冷時異音は観測されず、音圧差が１０より大きい場合には冷時異音が観測された。
転がり軸受 ： ６２０３（プーリ組み込み）
試験温度 ： −４０℃、２０℃
軸受回転条件 ： 開始３０秒間で７０００ｍｉｎ-1まで加速
試験荷重 ： 荷重２８０Ｎ In addition, in the test, the presence or absence of cold abnormal noise was evaluated by the examiner's hearing. In each of the test examples, the case where no abnormal noise occurred during cold was 〇, and the case where abnormal noise occurred during cold was ×. The presence or absence of cold abnormal noise is correlated with the numerical value of the sound pressure difference, and when the sound pressure difference is 10 or less (including negative values), the cold abnormal noise is not observed and the sound pressure difference is from 10 When it is large, cold noise was observed.
Rolling bearing: 6203 (with pulley)
Test temperature: -40 ° C, 20 ° C
Bearing rotation conditions: Acceleration to 7000 min- 1 in 30 seconds from start Test load: Load 280 N

Figure 2019048935
Figure 2019048935

Figure 2019048935
Figure 2019048935

表１には、基油全体に対してエーテル油を７０質量％、ＰＡＯ油を３０質量％含む基油を用いたグリース組成物を示し、表２には、基油全体に対してエーテル油を８０〜１００質量％、ＰＡＯ油を０〜２０質量％含む基油を用いたグリース組成物を示す。   Table 1 shows a grease composition using a base oil containing 70% by mass of ether oil and 30% by mass of PAO oil based on the whole base oil, and Table 2 shows an ether oil based on the whole base oil The grease composition using the base oil containing 80-100 mass% and 0-20 mass% of PAO oil is shown.

基油としてエーテル油のみを用いた場合には冷時異音が発生したが（比較例１７〜１９）、エーテル油に対してＰＡＯ油を所定量混合した基油とすることで、冷時異音を抑制することができた。ＰＡＯ油としては、比較的低動粘度のＰＡＯ油を用いることで冷時異音が抑制される傾向となった（実施例１〜４、比較例１〜５）。エーテル油としては、より低動粘度のエーテル油（ＬＢ３２）を用いることで冷時異音が抑制される傾向となった（実施例４、５、９、比較例１、２、１０〜１３）。また、より低動粘度のＰＡＯ油（ＰＡＯ４０１）を用いることで、ＰＡＯ油の含有量が少なくても冷時異音を抑制することができた（実施例６〜９）。特に、実施例９では、低動粘度のエーテル油（ＬＢ３２）と低動粘度のＰＡＯ油（ＰＡＯ４０１）を組み合わせることで、ＰＡＯ油が１０質量％でも冷時異音を抑制しており、この場合には、エーテル油の含有量を高くすることができる。一方、増ちょう剤については、基油および増ちょう剤の合計量において増ちょう剤が１８質量％以上となると、冷時異音が発生した（比較例６〜９、２０）。   When only ether oil was used as the base oil, cold noise occurred (comparative examples 17 to 19), but when the ether oil is mixed with a predetermined amount of PAO oil, the base oil is different from cold. I was able to suppress the sound. As PAO oil, by using PAO oil having a relatively low dynamic viscosity, abnormal noise tends to be suppressed during cold (Examples 1 to 4, Comparative Examples 1 to 5). As the ether oil, by using a lower kinematic viscosity ether oil (LB 32), abnormal noise tends to be suppressed during cold (Examples 4, 5, 9; Comparative Examples 1, 2, 10-13) . Further, by using PAO oil (PAO 401) having a lower dynamic viscosity, it was possible to suppress cold abnormal noise even if the content of PAO oil is small (Examples 6 to 9). In particular, in Example 9, by combining the low dynamic viscosity ether oil (LB 32) and the low dynamic viscosity PAO oil (PAO 401), even when the PAO oil is 10% by mass, cold abnormal noise is suppressed in this case. In addition, the content of ether oil can be increased. On the other hand, as for the thickener, when the thickener was 18% by mass or more in the total amount of the base oil and the thickener, cold noise occurred (Comparative Examples 6 to 9, 20).

以上のように、本発明のグリース組成物は、基油においてはエーテル油およびＰＡＯ油それぞれの４０℃における動粘度とそれらの混合比とに着目し、増ちょう剤においてはその含有量に着目してなされたものであり、これらが適正化されることで超低温条件下であっても冷時異音を抑制することができる。   As described above, the grease composition of the present invention focuses on the kinematic viscosities of the ether oil and PAO oil at 40 ° C. in the base oil and their mixing ratio, and focuses on the content of the thickener. By making these appropriate, it is possible to suppress cold abnormal noise even under ultra-low temperature conditions.

本発明のグリース組成物は、−２０℃よりもさらに低い超低温条件下であっても、冷時異音の発生を抑制することができるので、極寒冷地などでの使用に適している。特に、自動車用電装補機であるファンカップリング装置、オルタネータ、アイドラプーリ、テンションプーリ、電磁クラッチ、またはコンプレッサに適用する転がり軸受のグリース組成物として好適である。   The grease composition of the present invention can suppress the generation of cold abnormal noise even under ultra-low temperature conditions lower than -20 ° C, and therefore is suitable for use in extremely cold regions and the like. In particular, it is suitable as a grease composition of a rolling bearing applied to a fan coupling device, an alternator, an idler pulley, a tension pulley, an electromagnetic clutch, or a compressor, which is an automotive electrical accessory.

１ 転がり軸受
２ 内輪
３ 外輪
４ 転動体
５ 保持器
６ シール部材
７ グリース組成物
８ 開口部 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 4 Rolling element 5 Cage 6 Seal member 7 Grease composition 8 Opening

Claims (5)

エーテル油およびポリ−α−オレフィン油の混合油からなる基油と、増ちょう剤とを含むグリース組成物であって、
前記エーテル油は、４０℃における動粘度が２０〜４０ｍｍ2／ｓであり、
前記ポリ−α−オレフィン油が、該ポリ−α−オレフィン油の４０℃における動粘度が３０〜５０ｍｍ2／ｓであり、前記基油全体に対して２０〜４０質量％含まれるか、または、該ポリ−α−オレフィン油の４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満であり、前記基油全体に対して１０〜４０質量％含まれ、
前記増ちょう剤は、脂環式ジウレア化合物であり、前記基油と前記増ちょう剤との合計量に対して１０質量％以上１８質量％未満含まれることを特徴とするグリース組成物。 A grease composition comprising a base oil comprising a mixed oil of an ether oil and a poly-α-olefin oil, and a thickener.
The ether oil has a kinematic viscosity at 40 ° C. of 20 to 40 mm 2 / s,
The poly-α-olefin oil has a kinematic viscosity of 30 to 50 mm 2 / s at 40 ° C. of the poly-α-olefin oil, and is contained in an amount of 20 to 40% by mass with respect to the entire base oil, or The kinematic viscosity at 40 ° C. of the poly-α-olefin oil is 5 mm 2 / s or more and less than 30 mm 2 / s, and is contained in 10 to 40% by mass with respect to the entire base oil,
The grease composition characterized in that the thickening agent is an alicyclic diurea compound and is contained in an amount of 10% by mass to less than 18% by mass with respect to the total amount of the base oil and the thickening agent. エーテル油およびポリ−α−オレフィン油の混合油からなる基油と、増ちょう剤とを含むグリース組成物であって、
前記エーテル油は、４０℃における動粘度が６０〜１１０ｍｍ2／ｓであり、
前記ポリ−α−オレフィン油が、該ポリ−α−オレフィン油の４０℃における動粘度が３０〜３５ｍｍ2／ｓであり、前記基油全体に対して３０〜４０質量％含まれるか、または、該ポリ−α−オレフィン油の４０℃における動粘度が５ｍｍ2／ｓ以上３０ｍｍ2／ｓ未満であり、前記基油全体に対して２０〜４０質量％含まれ、
前記増ちょう剤は、脂環式ジウレア化合物であり、前記基油と前記増ちょう剤との合計量に対して１０質量％以上１８質量％未満含まれることを特徴とするグリース組成物。 A grease composition comprising a base oil comprising a mixed oil of an ether oil and a poly-α-olefin oil, and a thickener.
The ether oil has a kinematic viscosity at 40 ° C. of 60 to 110 mm 2 / s,
The poly-α-olefin oil has a kinematic viscosity at 40 ° C. of 30 to 35 mm 2 / s of the poly-α-olefin oil, and is contained in an amount of 30 to 40% by mass with respect to the whole base oil, or The kinematic viscosity at 40 ° C. of the poly-α-olefin oil is 5 mm 2 / s or more and less than 30 mm 2 / s, and is contained in 20 to 40% by mass with respect to the whole base oil,
The grease composition characterized in that the thickening agent is an alicyclic diurea compound and is contained in an amount of 10% by mass to less than 18% by mass with respect to the total amount of the base oil and the thickening agent. 前記エーテル油が、アルキルジフェニルエーテル油であることを特徴とする請求項１または請求項２記載のグリース組成物。   The grease composition according to claim 1 or 2, wherein the ether oil is an alkyl diphenyl ether oil. グリース組成物を封入してなるグリース封入転がり軸受であって、
前記グリース組成物が、請求項１から請求項３までのいずれか１項記載のグリース組成物であることを特徴とするグリース封入転がり軸受。 A grease-sealed rolling bearing in which a grease composition is sealed,
The grease-sealed rolling bearing according to any one of claims 1 to 3, wherein the grease composition is the grease composition according to any one of claims 1 to 3. 自動車用電装補機に用いられ、該自動車用電装補機がファンカップリング装置、オルタネータ、アイドラプーリ、テンションプーリ、電磁クラッチ、またはコンプレッサであることを特徴とする請求項４記載のグリース封入転がり軸受。   The grease-sealed rolling bearing according to claim 4, characterized in that it is used for an automotive electrical accessory, and the automotive electrical accessory is a fan coupling device, an alternator, an idler pulley, a tension pulley, an electromagnetic clutch, or a compressor. .
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