JP4064024B2 - Rolling bearing - Google Patents
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- JP4064024B2 JP4064024B2 JP33631299A JP33631299A JP4064024B2 JP 4064024 B2 JP4064024 B2 JP 4064024B2 JP 33631299 A JP33631299 A JP 33631299A JP 33631299 A JP33631299 A JP 33631299A JP 4064024 B2 JP4064024 B2 JP 4064024B2
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Description
【０００１】
【発明の属する技術分野】
この発明は、軸受を潤滑する含油樹脂を内臓した転がり軸受に関する。
【０００２】
【従来の技術】
内輪、外輪および転動体を備えた転がり軸受の内部空隙に、固体状に成形された含油樹脂を内蔵させる技術が、特公昭６３−２３２３９号公報等に開示されている。
【０００３】
この技術は、含油樹脂の樹脂成分として、超高分子量ポリエチレンなどを用いて軸受に所要量の潤滑油を連続的に適当な速度で滲み出させて供給しようとするものであり、転がり軸受に対して外部から潤滑油を供給する必要がなくなり、転がり軸受は、自己潤滑機能のみで長時間安定した動作が可能になる。
【０００４】
上記の転がり軸受は、内輪、外輪および転動体を備えた転がり軸受の内部空隙に含油樹脂の材料である混合物を空隙を満たすように注入し、その後に加熱し、次いで冷却することにより、含油樹脂を硬化させる方法で製造される。
【０００５】
他の製造法としては、含油樹脂の成分として熱可塑性樹脂を採用し、射出成形のように加熱溶融樹脂と潤滑油の混合物を転がり軸受の内部空隙を満たすように圧入し、そのまま封入した状態で冷却することにより、転がり軸受の内部空隙に含油樹脂を充填した状態で固化させる方法もある。
【０００６】
通常、このようにして製造される転がり軸受は、含油樹脂のデュロメータＡ硬さ（ＪＩＳ Ｋ６２５３）が８０〜９０である。
【０００７】
【発明が解決しようとする課題】
しかし、上記した従来の転がり軸受は、使用中に負荷のある状態で含油樹脂に対して外輪または内輪が度々圧接することにより、含油樹脂を介して軸受の負荷が転動体の回転抵抗として伝わり、転動体の回転速度を下げるという問題点がある。
【０００８】
このように転がり軸受の回転トルクが、内蔵された含油樹脂との接触時に損失すると、回転エネルギーを伝達する際の効率性の向上の観点からみて好ましくない。
【０００９】
そこで、この発明の課題は、上記した問題点を解決して、含油樹脂を内蔵した転がり軸受における回転トルクが低く安定し、含油樹脂の潤滑特性が効率よく発揮される転がり軸受とすることを課題としている。
【００１０】
【課題を解決するための手段】
上記の課題を解決するため、この発明においては、内輪、外輪および転動体を備えた転がり軸受の内部空隙に含油樹脂を内蔵した転がり軸受において、前記含油樹脂のデュロメータＡ硬さ（ＪＩＳ Ｋ６２５３）が７９以下である転がり軸受としたのである。前記した含油樹脂のデュロメータＡ硬さ（ＪＩＳ Ｋ６２５３）は、３０〜７９であることが好ましい。また、この発明において、含油樹脂として超高分子量ポリオレフィン、ポリアミドおよびポリアセタールから選ばれる一種以上の熱可塑性樹脂を主成分とする含油樹脂を採用することが好ましい。
【００１１】
上記したように構成された転がり軸受は、含油樹脂の硬さがデュロメータＡ硬さ（ＪＩＳ Ｋ６２５３）７９以下、すなわち従来品より軟質になるような所定値以下（または所定範囲）の硬さに調整されているので、使用中に負荷のある状態で外輪または内輪が度々含油樹脂に対して圧接した場合でも、軸受の負荷が転動体の回転抵抗として含油樹脂を介して伝わり難く、転動体の回転速度を下げる傾向が顕著に少ない。
【００１２】
すなわち、この発明の転がり軸受は、内蔵された含油樹脂と軸受付品との接触時に回転トルクが損失する程度が極めて小さく、そのために回転エネルギーを伝達する効率性が向上する。
【００１３】
【発明の実施の形態】
本願の発明に用いる含油樹脂は、潤滑油または潤滑グリースを樹脂中に分散保持した状態で固化（硬化）したものであり、その成分となる樹脂や潤滑油、潤滑グリースの種類は特に限定しないで採用可能である。また、樹脂として熱可塑性樹脂を使用し、かつ潤滑グリースを使用する場合には、熱可塑性樹脂のゲル化点より高い滴点を有する潤滑グリースを採用することが好ましい。
【００１４】
含油樹脂の樹脂成分の具体例としては、ポリオレフィン、ポリアミド、ポリアセタール、ポリカーボネート、ポリブチレンテレフタレート、ポリフェニレンスルフィド、ポリエーテルスルホン、ポリエーテルケトン、ポリアミドイミド、ポリスチレンなどの熱可塑性樹脂が挙げられる。このうち、より好ましくは超高分子量ポリオレフィン、ポリアミド、ポリアセタールなどである。また、このような熱可塑性樹脂に対してフェノール樹脂、エポキシ樹脂、シリコーン樹脂、ウレタン樹脂などの熱硬化性樹脂を混合し、耐熱性を高めた樹脂組成物を採用してもよい。
【００１５】
また、前記した超高分子量ポリオレフィンは、平均分子量１×１０6 〜５×１０6 の超高分子量ポリエチレンその他の超高分子量ポリオレフィンからなるものであり、粒径１〜１００μｍ程度の粉末状のものを採用することが均一混合のために好ましい。また、超高分子量ポリオレフィン１〜９５重量％と、潤滑油または潤滑グリース５〜９９重量％からなる混合物を使用して含油樹脂を転がり軸受の内部空隙に成形することができる。
【００１６】
含油樹脂の潤滑成分のうち、潤滑油の具体例としては、鉱油、合成炭化水素油、ジエステル油、ポリオールエステル油、リン酸エステル油、エーテル油、シリコーン油、フッ素油、フッ化シリコーン油、シクロペンタン油、その他の周知の潤滑油が挙げられる。
【００１７】
また、含油樹脂の潤滑成分のうち、潤滑グリースの具体例を増ちょう剤−基油の材料系で示すと以下の通りである。すなわち、リチウム石けん−鉱油系グリース、リチウム石けん−ジエステル油系グリース、リチウム石けん−ポリオールエステル油系グリース、ナトリウム石けん−鉱油系グリース、アルミニウム石けん−鉱油系グリース、非石けん−鉱油系グリース、非石けん−ジエステル油系グリース、非石けん−ポリオールエステル油系グリース、リチウム石けん−シリコーン油系グリース、ＰＴＦＥ−フッ素油系グリース、リチウム石けん−シクロペンタン油系グリースなどが挙げられる。なお、上記したグリースにおける非石けん系とは、石けん以外の増ちょう剤を用いて基油を増ちょうさせたグリースをいい、そのような増ちょう剤の具体例としては、ベントナイト、シリカ、亜硝酸ホウ素、テレフタラメート、アリルウレア、ポリウレア、フッ素化合物などが挙げられる。
【００１８】
【実施例および比較例】
実施例および比較例の転がり軸受において、内部空隙に充填するための流動性の混合物を構成する樹脂、潤滑油および添加剤を以下に列挙し、混合物の組成を表１にまとめて示した。
(1) 超高分子量ポリオレフィン（三井化学社製：ミペロン）
(2) 低分子量ポリオレフィン含有固形ワックス（三井化成社製：サンワックス）
(3) リチウム石けん−鉱油系グリース（昭和シェル社製）
(4) ウレア−鉱油系グリース（昭和シェル社製）
(5) ポリオールエステル油（チバガイギー社製：レオルーブ）。
【００１９】
〔実施例１〜４〕
深溝玉軸受（ＮＴＮ社製：軸受番号６０８、内径φ８ｍｍ、外径φ２２ｍｍ、幅７ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に３０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した実施例１〜３の転がり軸受を製造した。
【００２０】
また、自動調心ころ軸受（ＮＴＮ社製：軸受番号２２２１６、内径φ８０ｍｍ、外径φ１４０ｍｍ、幅３３ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に６０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した実施例４の自動調心ころ軸受を製造した。
【００２１】
得られた転がり軸受内の含油樹脂の硬さを以下の方法で測定すると共に、深溝玉軸受（ＮＴＮ社製：軸受番号６０８）の回転トルク試験、および自動調心ころ軸受（ＮＴＮ社製：軸受番号２２２１６）の回転トルク試験を以下のように行ない、これらの結果を表１中に併記した。
（ａ）硬さ：ＪＩＳ Ｋ ６２５３のタイプＡ圧子を用いたデュロメータＡ硬さを測定した。
（ｂ）深溝玉軸受（軸受番号６０８）の回転トルク試験：試験軸受にスラスト荷重２ｋｇｆを負荷し、室温にて３６００ｒｐｍで回転させた時の回転トルクを測定した。
（ｃ）自動調心ころ軸受（軸受番号２２２１６）の回転トルク試験：試験軸受にラジアル荷重９００ｋｇｆを負荷し、室温にて１２００ｒｐｍで１時間連続して回転させた時の回転トルクを測定した。
【００２２】
【表１】
〔実施例５〕
深溝玉軸受（ＮＴＮ社製：軸受番号６２０４、内径φ２０ｍｍ、外径φ４７ｍｍ、幅１４ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に３０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した実施例５の転がり軸受を製造した。
【００２４】
得られた転がり軸受内の含油樹脂の硬さを下記の方法で測定すると共に、回転トルク試験を以下の条件で行ない、これらの結果を表１中に併記した。
（ｄ）深溝玉軸受（軸受番号６２０４）の回転トルク試験：試験軸受にスラスト荷重４ｋｇｆを負荷し、室温にて６０００ｒｐｍで１時間連続して回転させた時の回転トルクを測定した。
【００２５】
〔比較例１〜４〕
深溝玉軸受（ＮＴＮ社製：軸受番号６０８、内径φ８ｍｍ、外径φ２２ｍｍ、幅７ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に３０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した比較例１、４の転がり軸受を製造した。
【００２６】
また、自動調心ころ軸受（ＮＴＮ社製：軸受番号２２２１６、内径φ８０ｍｍ、外径φ１４０ｍｍ、幅３３ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に６０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した比較例２の自動調心ころ軸受を製造した。
【００２７】
また、深溝玉軸受（ＮＴＮ社製：軸受番号６２０４、内径φ２０ｍｍ、外径φ４７ｍｍ、幅１４ｍｍ）の軸受内部空間に表１の組成の含油樹脂材料（流動性のある混合物）を充填すると共に、軸受の両端面に開口する空隙を金属製の平板で蓋をして混合物を封入し、軸受を１５０℃の恒温槽に３０分入れ、次いで恒温槽から取り出した軸受を室温にまで放冷して混合物を固形状化し、含油樹脂を内蔵した比較例３の転がり軸受を製造した。
【００２８】
得られた比較例１〜４の転がり軸受内の含油樹脂の硬さを前記の方法で測定すると共に、回転トルク試験を以下の条件で行ない、これらの結果を表１中に併記した。
【００２９】
表１の結果からも明らかなように、比較例１〜４のころ軸受は、デュロメータＡ硬さが７９以下のものであり、各主の軸受の回転トルクは大きかった。これに対して実施例１〜４のころ軸受は、それぞれ同型の軸受である比較例の場合に比べて回転トルクが顕著に低いものであった。
【００３０】
【発明の効果】
本願の含油樹脂を内蔵した転がり軸受に係る発明は、以上説明したように、含油樹脂として所定硬さのものを使用したので、含油樹脂を介して軸受の負荷が転動体の回転抵抗として伝わることがなく、含油樹脂を内蔵した転がり軸受における回転トルクが低くて安定し、含油樹脂の潤滑特性が効率よく発揮される自己潤滑性に優れた転がり軸受になるという利点がある。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing incorporating an oil-containing resin that lubricates the bearing.
[0002]
[Prior art]
Japanese Patent Publication No. 63-23239 discloses a technique of incorporating an oil-containing resin molded into a solid state into an internal space of a rolling bearing provided with an inner ring, an outer ring, and rolling elements.
[0003]
This technology uses ultra-high molecular weight polyethylene as the resin component of the oil-impregnated resin to continuously ooze and supply the required amount of lubricating oil to the bearing at an appropriate speed. Therefore, it is not necessary to supply lubricating oil from the outside, and the rolling bearing can operate stably for a long time only by the self-lubricating function.
[0004]
The above rolling bearing is made by injecting a mixture, which is a material of the oil-impregnated resin, into the inner space of the rolling bearing having the inner ring, the outer ring and the rolling elements so as to fill the space, and then heating and then cooling the mixture. It is manufactured by a method of curing.
[0005]
As another manufacturing method, a thermoplastic resin is used as a component of the oil-impregnated resin, and a mixture of a heat-melting resin and a lubricating oil is press-fitted so as to fill the internal voids of the rolling bearing as in injection molding, and is encapsulated as it is. There is also a method of solidification in a state where the internal voids of the rolling bearing are filled with the oil-containing resin by cooling.
[0006]
Usually, the rolling bearing manufactured in this way has an oil-containing resin durometer A hardness (JIS K6253) of 80 to 90.
[0007]
[Problems to be solved by the invention]
However, in the conventional rolling bearing described above, the outer ring or the inner ring is frequently in pressure contact with the oil-impregnated resin in a state where there is a load during use, so that the load of the bearing is transmitted as the rotational resistance of the rolling element via the oil-impregnated resin. There is a problem of lowering the rotational speed of the rolling elements.
[0008]
Thus, if the rotational torque of the rolling bearing is lost at the time of contact with the built-in oil-containing resin, it is not preferable from the viewpoint of improving the efficiency in transmitting rotational energy.
[0009]
Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a rolling bearing in which the rotational torque in the rolling bearing incorporating the oil-containing resin is low and stable, and the lubricating properties of the oil-containing resin are efficiently exhibited. It is said.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, in a rolling bearing in which an oil-impregnated resin is incorporated in an internal space of a rolling bearing having an inner ring, an outer ring, and a rolling element, the durometer A hardness (JIS K6253) of the oil-impregnated resin is set. The rolling bearing is 79 or less. The durometer A hardness (JIS K6253) of the oil-containing resin described above is preferably 30 to 79. In the present invention, it is preferable to employ an oil-containing resin mainly composed of one or more thermoplastic resins selected from ultrahigh molecular weight polyolefin, polyamide and polyacetal.
[0011]
The rolling bearing configured as described above is adjusted to a durometer A hardness (JIS K6253) of 79 or less, that is, a hardness of a predetermined value or less (or a predetermined range) that is softer than the conventional product. Therefore, even when the outer ring or inner ring is frequently in pressure contact with the oil-impregnated resin during use, the bearing load is difficult to be transmitted through the oil-impregnated resin as the rotational resistance of the rolling element. Remarkably less tendency to reduce speed.
[0012]
That is, in the rolling bearing of the present invention, the degree of loss of rotational torque when contacting the built-in oil-impregnated resin and the bearing-equipped product is extremely small, and therefore the efficiency of transmitting rotational energy is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The oil-impregnated resin used in the invention of the present application is obtained by solidifying (curing) lubricating oil or lubricating grease while being dispersed and retained in the resin, and the types of resin, lubricating oil, and lubricating grease as components thereof are not particularly limited. It can be adopted. Further, when a thermoplastic resin is used as the resin and a lubricating grease is used, it is preferable to employ a lubricating grease having a dropping point higher than the gel point of the thermoplastic resin.
[0014]
Specific examples of the resin component of the oil-containing resin include thermoplastic resins such as polyolefin, polyamide, polyacetal, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyethersulfone, polyetherketone, polyamideimide, and polystyrene. Of these, ultra high molecular weight polyolefin, polyamide, polyacetal and the like are more preferable. Moreover, you may employ | adopt the resin composition which mixed thermosetting resins, such as a phenol resin, an epoxy resin, a silicone resin, and a urethane resin, with such a thermoplastic resin, and improved heat resistance.
[0015]
The ultra-high molecular weight polyolefin described above is composed of ultra-high molecular weight polyethylene having an average molecular weight of 1 × 10 6 to 5 × 10 6 and other ultra-high molecular weight polyolefin, and is in the form of a powder having a particle size of about 1 to 100 μm. It is preferable to adopt it for uniform mixing. In addition, the oil-containing resin can be formed into the internal gap of the rolling bearing by using a mixture of 1 to 95% by weight of ultrahigh molecular weight polyolefin and 5 to 99% by weight of lubricating oil or lubricating grease.
[0016]
Among the lubricating components of the oil-containing resin, specific examples of the lubricating oil include mineral oil, synthetic hydrocarbon oil, diester oil, polyol ester oil, phosphate ester oil, ether oil, silicone oil, fluorine oil, fluorosilicone oil, cyclohexane Examples include pentane oil and other well-known lubricating oils.
[0017]
Further, among the lubricating components of the oil-containing resin, a specific example of the lubricating grease is shown below as a thickener-base oil material system. Lithium soap-mineral oil grease, lithium soap-diester oil grease, lithium soap-polyol ester oil grease, sodium soap-mineral oil grease, aluminum soap-mineral oil grease, non-soap-mineral oil grease, non-soap- Examples include diester oil-based greases, non-soap-polyol ester oil-based greases, lithium soap-silicone oil-based greases, PTFE-fluorine oil-based greases, and lithium soap-cyclopentane oil-based greases. In addition, the non-soap system in the above-mentioned grease refers to a grease in which a base oil is increased using a thickener other than soap, and specific examples of such a thickener include bentonite, silica, nitrous acid. Examples thereof include boron, terephthalamate, allyl urea, polyurea, and fluorine compounds.
[0018]
Examples and Comparative Examples
In the rolling bearings of Examples and Comparative Examples, resins, lubricating oils, and additives constituting the fluid mixture for filling the internal voids are listed below, and the composition of the mixture is summarized in Table 1.
(1) Ultra high molecular weight polyolefin (Mitsui Chemical Co., Ltd .: Mipperon)
(2) Low molecular weight polyolefin-containing solid wax (Mitsui Kasei Co., Ltd .: Sun Wax)
(3) Lithium soap-mineral oil grease (made by Showa Shell)
(4) Urea-mineral oil grease (made by Showa Shell)
(5) Polyol ester oil (manufactured by Ciba Geigy: Leorb).
[0019]
[Examples 1 to 4]
A deep groove ball bearing (made by NTN: bearing number 608, inner diameter φ8 mm, outer diameter φ22 mm, width 7 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1 at both ends of the bearing. The gap opening in the surface is covered with a metal flat plate to enclose the mixture, the bearing is placed in a thermostatic bath at 150 ° C. for 30 minutes, and then the bearing taken out of the thermostatic bath is allowed to cool to room temperature to solidify the mixture. Rolling bearings of Examples 1 to 3 having a shape and containing an oil-containing resin were manufactured.
[0020]
In addition, the bearing inner space of a self-aligning roller bearing (made by NTN: bearing number 22216, inner diameter φ80 mm, outer diameter φ140 mm, width 33 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1. Then, the gaps opened at both end faces of the bearing are covered with a metal flat plate, the mixture is sealed, the bearing is placed in a thermostatic bath at 150 ° C. for 60 minutes, and then the bearing taken out from the thermostatic bath is allowed to cool to room temperature. Thus, the mixture was solidified to produce a self-aligning roller bearing of Example 4 in which an oil-containing resin was incorporated.
[0021]
The hardness of the oil-impregnated resin in the obtained rolling bearing was measured by the following method, a rotational torque test of a deep groove ball bearing (NTN company: bearing number 608), and a self-aligning roller bearing (NTN company: bearing). The rotational torque test of No. 22216) was performed as follows, and these results are shown in Table 1.
(A) Hardness: Durometer A hardness using a JIS K 6253 type A indenter was measured.
(B) Rotational torque test of deep groove ball bearing (Bearing No. 608): The rotational torque when a thrust load of 2 kgf was applied to the test bearing and rotated at 3600 rpm at room temperature was measured.
(C) Rotational torque test of self-aligning roller bearing (Bearing No. 22216): A rotational load was measured when a radial load of 900 kgf was applied to the test bearing and continuously rotated at 1200 rpm for 1 hour at room temperature.
[0022]
[Table 1]
Example 5
A deep groove ball bearing (made by NTN: bearing number 6204, inner diameter φ20 mm, outer diameter φ47 mm, width 14 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1 at both ends of the bearing. The gap opening in the surface is covered with a metal flat plate to enclose the mixture, the bearing is placed in a thermostatic bath at 150 ° C. for 30 minutes, and then the bearing taken out of the thermostatic bath is allowed to cool to room temperature to solidify the mixture. The rolling bearing of Example 5 having a shape and containing an oil-containing resin was manufactured.
[0024]
The hardness of the oil-containing resin in the obtained rolling bearing was measured by the following method, and a rotational torque test was performed under the following conditions. These results are also shown in Table 1.
(D) Rotational torque test of deep groove ball bearing (Bearing No. 6204): A thrust load of 4 kgf was applied to the test bearing, and the rotational torque was measured by continuously rotating at 6000 rpm for 1 hour at room temperature.
[0025]
[Comparative Examples 1-4]
A deep groove ball bearing (made by NTN: bearing number 608, inner diameter φ8 mm, outer diameter φ22 mm, width 7 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1 at both ends of the bearing. The gap opening in the surface is covered with a metal flat plate to enclose the mixture, the bearing is placed in a thermostatic bath at 150 ° C. for 30 minutes, and then the bearing taken out of the thermostatic bath is allowed to cool to room temperature to solidify the mixture. The rolling bearings of Comparative Examples 1 and 4 having a shape and containing an oil-containing resin were manufactured.
[0026]
In addition, the bearing inner space of a self-aligning roller bearing (made by NTN: bearing number 22216, inner diameter φ80 mm, outer diameter φ140 mm, width 33 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1. Then, the gaps opened at both end faces of the bearing are covered with a metal flat plate, the mixture is sealed, the bearing is placed in a thermostatic bath at 150 ° C. for 60 minutes, and then the bearing taken out from the thermostatic bath is allowed to cool to room temperature. Thus, the mixture was solidified to produce a self-aligning roller bearing of Comparative Example 2 containing an oil-containing resin.
[0027]
Further, a deep groove ball bearing (made by NTN: bearing number 6204, inner diameter φ20 mm, outer diameter φ47 mm, width 14 mm) is filled with an oil-containing resin material (fluid mixture) having the composition shown in Table 1 and the bearing The gaps opened at both end surfaces of the metal plate are covered with a metal flat plate, the mixture is sealed, the bearing is placed in a thermostatic bath at 150 ° C. for 30 minutes, and then the bearing taken out of the thermostatic bath is allowed to cool to room temperature and then the mixture is mixed. Was made into a solid and a rolling bearing of Comparative Example 3 containing an oil-containing resin was produced.
[0028]
The hardness of the oil-containing resin in the obtained rolling bearings of Comparative Examples 1 to 4 was measured by the above method, and a rotational torque test was performed under the following conditions. These results are also shown in Table 1.
[0029]
As is apparent from the results in Table 1, the roller bearings of Comparative Examples 1 to 4 had a durometer A hardness of 79 or less, and the rotational torque of each main bearing was large. On the other hand, each of the roller bearings of Examples 1 to 4 had a remarkably low rotational torque as compared with the comparative example, which is the same type of bearing.
[0030]
【The invention's effect】
As described above, the invention relating to the rolling bearing incorporating the oil-impregnated resin according to the present application uses a predetermined hardness as the oil-impregnated resin, so that the load of the bearing is transmitted as the rotational resistance of the rolling element via the oil-impregnated resin. There is no advantage, and the rolling bearing in which the oil-impregnated resin is incorporated has the advantage that the rotational torque is low and stable, and the roller bearing is excellent in self-lubricating properties in which the lubricating properties of the oil-impregnated resin are efficiently exhibited.
Claims (2)
前記含油樹脂が、超高分子量ポリオレフィンを主成分とする樹脂中に、ウレア増ちょう剤で鉱油を増ちょうしたウレア−鉱油系グリースを分散保持した状態で固化したものからなり、この含油樹脂のデュロメータＡ硬さ（ＪＩＳＫ６２５３）が３５〜６９に調整されていることを特徴とする転がり軸受。In rolling bearings containing oil-impregnated resin in the internal gaps of rolling bearings with inner rings, outer rings and rolling elements,
The oil-impregnated resin is a resin whose main component is an ultra-high molecular weight polyolefin, which is solidified in a state in which a urea-mineral oil-based grease in which mineral oil is increased with a urea thickener is dispersed and held. A rolling bearing characterized in that the A hardness (JISK6253) is adjusted to 35 to 69.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33631299A JP4064024B2 (en) | 1999-11-26 | 1999-11-26 | Rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP33631299A JP4064024B2 (en) | 1999-11-26 | 1999-11-26 | Rolling bearing |
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| Publication Number | Publication Date |
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| JP2001152171A JP2001152171A (en) | 2001-06-05 |
| JP4064024B2 true JP4064024B2 (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP33631299A Expired - Lifetime JP4064024B2 (en) | 1999-11-26 | 1999-11-26 | Rolling bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5086564B2 (en) * | 2006-05-29 | 2012-11-28 | Ｎｔｎ株式会社 | Solid lubricant and rolling bearing with solid lubricant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55137198A (en) * | 1979-04-13 | 1980-10-25 | Ntn Toyo Bearing Co Ltd | Lubricating composition for ball-and-roller bearing |
| JP3263492B2 (en) * | 1993-07-29 | 2002-03-04 | エヌティエヌ株式会社 | Heat resistant solid lubricant |
| JPH08117245A (en) * | 1994-10-20 | 1996-05-14 | Nippon Seiko Kk | Dental handpiece |
| JPH08269255A (en) * | 1994-12-29 | 1996-10-15 | Ntn Corp | Lubricating resin composition |
| JPH08183982A (en) * | 1994-12-29 | 1996-07-16 | Ntn Corp | Production of rolling bearing containing solid lubricant sealed therein |
| JPH08309793A (en) * | 1995-05-22 | 1996-11-26 | Nippon Seiko Kk | Production of oil-containing polymer molded product |
| JP3647942B2 (en) * | 1995-09-29 | 2005-05-18 | Ｎｔｎ株式会社 | Manufacturing method of rolling bearing filled with solid lubricant |
| JPH10184684A (en) * | 1996-10-31 | 1998-07-14 | Ntn Corp | Sliding bearing for oral cavity hygienic instrument |
| JP4009388B2 (en) * | 1999-05-07 | 2007-11-14 | 株式会社ジェイテクト | Lubricant composition for rolling bearing, rolling bearing filled with the lubricant composition, and method for producing lubricant composition for rolling bearing |
| JP4013016B2 (en) * | 1999-06-01 | 2007-11-28 | 日本精工株式会社 | Lubricant supply composition and rolling bearing filled with the same |
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1999
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