JP2015121276A - Solid lubricant assembled bearing - Google Patents

Solid lubricant assembled bearing Download PDF

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JP2015121276A
JP2015121276A JP2013265611A JP2013265611A JP2015121276A JP 2015121276 A JP2015121276 A JP 2015121276A JP 2013265611 A JP2013265611 A JP 2013265611A JP 2013265611 A JP2013265611 A JP 2013265611A JP 2015121276 A JP2015121276 A JP 2015121276A
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Prior art keywords
resin
solid lubricant
bearing
cage
component
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恵梨子 板橋
Eriko Itabashi
恵梨子 板橋
芳英 姫野
Yoshihide Himeno
芳英 姫野
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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    • 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
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/664—Retaining the liquid in or near the bearing
    • F16C33/6648—Retaining the liquid in or near the bearing in a porous or resinous body, e.g. a cage impregnated with the liquid
    • 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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/30—Fluoropolymers
    • F16C2208/34—Polyvinylidenefluoride [PVDF]
    • 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
    • F16C33/38—Ball cages
    • F16C33/42—Ball cages made from wire or sheet metal strips
    • F16C33/422—Ball cages made from wire or sheet metal strips made from sheet metal
    • F16C33/427—Ball cages made from wire or sheet metal strips made from sheet metal from two parts, e.g. ribbon cages with two corrugated annular parts
    • 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
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6688—Lubricant compositions or properties, e.g. viscosity

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a solid lubricant assembled bearing which can be reduced in torque and elongated in life even if used in a high-temperature environment, and can utilize a resin-made cage which is formed of an arbitrary resin material.SOLUTION: A solid lubricant assembled bearing 1 is formed by assembling a solid lubricant 6 into a cage 5 in a bearing. The solidified solid lubricant 6 is formed by heating a mixture of a resin component and a lubrication component at a melting point of the resin component or higher, and cooling and solidifying the resin component. The resin component is a polyvinylidene fluoride resin which is synthesized by an emulsion polymerization method, and the lubrication component contains fluorine grease or fluorine oil. The resin component is contained in the mixture at a ratio of 10 to 40 vol.% as a whole, and the lubrication component is contained in the mixture at a ratio of 60 to 90 vol.% as a whole.

Description

本発明は、固形潤滑剤を内部に組み込んだ軸受に関し、特に固形潤滑剤の樹脂母材としてポリフッ化ビニリデン樹脂を用いた転がり軸受に関する。   The present invention relates to a bearing in which a solid lubricant is incorporated, and more particularly to a rolling bearing using a polyvinylidene fluoride resin as a resin base material of the solid lubricant.

転がり軸受の内部には、転がり摩擦や滑り摩擦の軽減等を目的として、潤滑用のグリースが封入されている。グリースを封入した転がり軸受は、長寿命で外部の潤滑ユニットなどが不要かつ安価であるため、自動車や産業用機器などの汎用用途によく利用される。しかし、グリースのような半固体状潤滑剤を使用した場合、潤滑剤に起因する攪拌抵抗のために回転トルクが大きくなる。この不具合を解決するため、例えば特許文献１〜特許文献３のような軸受が開発されている。   Lubricating grease is enclosed inside the rolling bearing for the purpose of reducing rolling friction and sliding friction. Rolling bearings filled with grease are often used for general purposes such as automobiles and industrial equipment because they have a long life and do not require an external lubrication unit. However, when a semisolid lubricant such as grease is used, the rotational torque increases due to the stirring resistance caused by the lubricant. In order to solve this problem, for example, bearings such as Patent Documents 1 to 3 have been developed.

特許文献１では、自己潤滑性の保持器を組み込んだ転がり軸受が提案されている。この保持器は、所定の自己潤滑性の樹脂材料を射出成形してなる。射出成形用の樹脂材料は、低分子量ポリエチレン等のポリオレフィン系樹脂と潤滑油とを１５０℃程度で加熱しながら混合して均一に相溶させ、放冷して固化し、この固形物と超高分子量ポリエチレン等とを粉砕混合して得ている。   Patent Document 1 proposes a rolling bearing incorporating a self-lubricating cage. This cage is formed by injection molding a predetermined self-lubricating resin material. The resin material for injection molding is made by mixing polyolefin resin such as low molecular weight polyethylene and lubricating oil while heating at about 150 ° C., mixing them uniformly, allowing to cool, solidifying, It is obtained by grinding and mixing with molecular weight polyethylene or the like.

特許文献２では、転がり軸受において、潤滑剤含有ポリマを内輪の外径面や外輪の内径面に固定し、転動体の軸受空隙部に露出した部分のうち一部に接触させたものが提案されている。潤滑剤供給部材となる上記潤滑剤含有ポリマの態様としては、例えば、平板リング状の鋼板等（シール部材）を芯材として、潤滑剤含有ポリマをインサート成形したものを用いている。潤滑剤含有ポリマの母材樹脂としては、特許文献１と同様にポリオレフィン系樹脂を主に採用している。   Patent Document 2 proposes a rolling bearing in which a lubricant-containing polymer is fixed to an outer diameter surface of an inner ring or an inner diameter surface of an outer ring and is in contact with a part of a portion exposed to a bearing gap of a rolling element. ing. As an aspect of the lubricant-containing polymer serving as the lubricant supply member, for example, a material obtained by insert-molding the lubricant-containing polymer using a flat ring-shaped steel plate or the like (seal member) as a core material is used. As a base material resin of the lubricant-containing polymer, a polyolefin resin is mainly employed as in Patent Document 1.

特許文献３では、耐熱性に優れた固形潤滑剤を封入した軸受として、フッ素樹脂粉末９５〜１重量％と、フッ素油もしくはフッ素シリコーン油または両者を併用した潤滑油を混合した混合物を軸受の潤滑対象物の空所に封入して、上記フッ素樹脂の融点以上の温度で加熱した後に冷却して固形化したものが提案されている。   In Patent Document 3, as a bearing in which a solid lubricant excellent in heat resistance is sealed, a mixture obtained by mixing 95 to 1% by weight of a fluororesin powder and fluorine oil or fluorine silicone oil or a lubricating oil using a combination of both is used to lubricate the bearing. There has been proposed a product that is sealed in a void of an object, heated at a temperature equal to or higher than the melting point of the fluororesin, and then cooled and solidified.

特許第３３６５４４９号公報Japanese Patent No. 3365449 特開２００１−３１７５５７号公報JP 2001-317557 A 特許第３２６３４９１号公報Japanese Patent No. 3263491

特許文献１や特許文献２の転がり軸受では、潤滑剤供給部材（保持器本体や潤滑含有ポリマ）から潤滑剤を供給することで、グリースのような半固体状潤滑剤を封入する場合と比較してトルクを低減させている。しかし、これら文献にあるように樹脂母材としてポリエチレン等のポリオレフィン系樹脂を用いる場合、融点が低く、高温環境下（例えば１５０℃以上）で該軸受を使用することは困難である。   The rolling bearings of Patent Document 1 and Patent Document 2 are compared with the case where a semi-solid lubricant such as grease is sealed by supplying a lubricant from a lubricant supply member (cage body or lubrication-containing polymer). To reduce torque. However, as described in these documents, when a polyolefin resin such as polyethylene is used as a resin base material, the melting point is low, and it is difficult to use the bearing in a high temperature environment (for example, 150 ° C. or more).

特許文献３で使用する固形潤滑剤は、フッ素樹脂を母材とするため高温での使用が可能となる。しかし、フッ素樹脂の種類によっては、十分な固形化ができずに早期に飛散して長寿命化が図れないおそれや、その他軸受性能に悪影響を及ぼすおそれがある。例えば、フッ素樹脂として、特許文献３の実施例で使用するポリテトラフルオロエチレン（ＰＴＦＥ）樹脂およびエチレン−テトラフルオロエチレン（ＥＴＦＥ）樹脂を用いる場合、固形化の際に３５０℃程度の高温で焼成する必要があり、軸受に封入した後に焼成すると軸受の寸法精度および硬度の低下のおそれがある。また、樹脂製保持器を用いた構成とする場合、保持器の樹脂材質を上記焼成工程に耐え得る超高耐熱性樹脂とする必要があり、樹脂製保持器の樹脂材質として汎用的であるポリアミド樹脂（例えば、ポリアミド（ＰＡ）６６）などは採用できない。   Since the solid lubricant used in Patent Document 3 uses a fluororesin as a base material, it can be used at a high temperature. However, depending on the type of the fluororesin, there is a possibility that it cannot be sufficiently solidified and scattered at an early stage so that the service life cannot be extended, or other bearing performance may be adversely affected. For example, when the polytetrafluoroethylene (PTFE) resin and the ethylene-tetrafluoroethylene (ETFE) resin used in Examples of Patent Document 3 are used as the fluororesin, firing is performed at a high temperature of about 350 ° C. during solidification. If it is necessary and fired after being sealed in the bearing, the dimensional accuracy and hardness of the bearing may be reduced. In the case of using a resin cage, it is necessary to make the resin material of the cage an ultra-high heat-resistant resin that can withstand the firing process. Polyamide, which is a general-purpose resin material for resin cages Resin (for example, polyamide (PA) 66) cannot be used.

本発明はこのような問題に対処するためになされたものであり、高温環境下での使用においても、低トルク化および長寿命化が図れ、さらに任意の樹脂材料による樹脂製保持器を利用できる固形潤滑剤組込軸受を提供することを目的とする。   The present invention has been made to cope with such a problem. Even when used in a high temperature environment, the torque can be reduced and the life can be extended, and a resin cage made of any resin material can be used. An object is to provide a solid lubricant built-in bearing.

本発明の固形潤滑剤組込軸受は、軸受内に固形潤滑剤を組み込んだ固形潤滑剤組込軸受であって、上記固形潤滑剤は、樹脂成分と潤滑成分との混合物を、該樹脂成分の融点以上で加熱し、冷却固化して固形化した潤滑剤であり、上記樹脂成分が乳化重合法で合成されたポリフッ化ビニリデン（ＰＶＤＦ）樹脂であり、上記潤滑成分がフッ素グリースおよび／またはフッ素油を含み、上記混合物全体に対して、上記樹脂成分が１０〜４０体積％、上記潤滑成分が６０〜９０体積％の割合で含まれることを特徴とする。   The solid lubricant built-in bearing of the present invention is a solid lubricant built-in bearing in which a solid lubricant is incorporated in the bearing, and the solid lubricant contains a mixture of a resin component and a lubricating component. A lubricant that is heated above the melting point, solidified by cooling and solidifying, the resin component is a polyvinylidene fluoride (PVDF) resin synthesized by an emulsion polymerization method, and the lubricant component is fluorine grease and / or fluorine oil The resin component is contained in a proportion of 10 to 40% by volume and the lubricating component is contained in a proportion of 60 to 90% by volume with respect to the whole mixture.

上記ＰＶＤＦ樹脂は、樹脂温度２３２℃、せん断速度１００ｓ−１における溶融粘度（ＡＳＴＭ Ｄ ３８３５）が１５００Ｐａ・ｓ以上であることを特徴とする。また、上記固形潤滑剤の硬さが、ショア硬さ（Ｈｓ；ＡＳＴＭ Ｄ ２２４０Ａ（スプリング式））で６５以上であることを特徴とする。 The PVDF resin has a melt viscosity (ASTM D 3835) at a resin temperature of 232 ° C. and a shear rate of 100 s −1 of 1500 Pa · s or more. The solid lubricant may have a hardness of 65 or more in Shore hardness (Hs; ASTM D 2240A (spring type)).

上記固形潤滑剤組込軸受が、転動体および該転動体を保持する保持器を有する転がり軸受であり、上記保持器に上記固形潤滑剤を組み込んでなることを特徴とする。また、上記保持器が樹脂製保持器であることを特徴とする。特に、上記樹脂製保持器の樹脂材料がＰＡ樹脂であり、上記固形潤滑剤が、上記保持器に一体成形されて組み込まれていることを特徴とする。なお、本発明での一体成形とは、例えば、予め成形された保持器に対して、上記混合物を充填して成形（固形化）し、保持器と固形潤滑剤とを一体化することをいう。   The solid lubricant built-in bearing is a rolling bearing having a rolling element and a cage for holding the rolling element, and the solid lubricant is incorporated in the cage. Further, the cage is a resin cage. In particular, the resin material of the resin cage is a PA resin, and the solid lubricant is integrally formed and incorporated in the cage. In addition, integral molding in the present invention refers to, for example, filling (mixing) the above mixture into a pre-molded cage, and integrating the cage and the solid lubricant. .

本発明の固形潤滑剤組込軸受は、軸受内に固形潤滑剤を組み込んだ固形潤滑剤組込軸受であり、上記固形潤滑剤は、樹脂成分と潤滑成分との混合物を、該樹脂成分の融点以上で加熱し、冷却固化して固形化した潤滑剤であり、上記樹脂成分が乳化重合法で合成されたＰＶＤＦ樹脂であり、上記潤滑成分がフッ素グリースおよび／またはフッ素油を含み、上記混合物全体に対して、上記樹脂成分が１０〜４０体積％、上記潤滑成分が６０〜９０体積％の割合で含まれるので、使用時には上記潤滑成分が徐々に滲み出して潤滑に寄与し、低トルク化が図れる。また、潤滑成分量も多いので、長寿命化が図れる。特に、固形潤滑剤が、乳化重合法によるＰＶＤＦ樹脂と、フッ素グリース／フッ素油とを組み合わせたものであるので、十分な固形化が可能であり、早期に飛散すること等を防止できる。また、ＰＶＤＦ樹脂を母材とする固形潤滑剤とすることで、高温環境下（１５０℃程度）での使用に十分耐えることができ、かつ、固形化時の加熱温度は他のフッ素樹脂と比較して低くできる。このため、軸受性能への悪影響を少なくでき、併用する樹脂製保持器の材質としても汎用樹脂が採用できる。   The solid lubricant built-in bearing of the present invention is a solid lubricant built-in bearing in which a solid lubricant is incorporated in the bearing, and the solid lubricant contains a mixture of a resin component and a lubricating component, and a melting point of the resin component. A lubricant that has been heated, cooled, solidified and solidified, and the resin component is a PVDF resin synthesized by an emulsion polymerization method. The lubricant component contains fluorine grease and / or fluorine oil, and the entire mixture On the other hand, since the resin component is contained in a proportion of 10 to 40% by volume and the lubricating component is contained in a proportion of 60 to 90% by volume, the lubricating component gradually oozes out during use, contributing to lubrication and reducing torque. I can plan. In addition, since the amount of the lubricating component is large, the life can be extended. In particular, since the solid lubricant is a combination of PVDF resin obtained by an emulsion polymerization method and fluorine grease / fluorine oil, sufficient solidification is possible, and early scattering can be prevented. In addition, by using a solid lubricant based on PVDF resin, it can sufficiently withstand use in a high temperature environment (about 150 ° C), and the heating temperature during solidification is compared with other fluororesins. Can be lowered. For this reason, the adverse effect on the bearing performance can be reduced, and general-purpose resin can be adopted as the material of the resin cage used together.

上記ＰＶＤＦ樹脂は、樹脂温度２３２℃、せん断速度１００ｓ−１における溶融粘度が１５００Ｐａ・ｓ以上であるので、焼成後の固形潤滑剤の硬さ（Ｈｓ）が大きくなり、軸受回転による飛散を抑制しやすくなる。特に、上記固形潤滑剤の硬さが、ショア硬さ（Ｈｓ）で６５以上であるので、上記飛散をより抑制しやすく、軸受の長寿命化が図れる。 Since the PVDF resin has a melt viscosity of 1500 Pa · s or more at a resin temperature of 232 ° C. and a shear rate of 100 s −1 , the hardness (Hs) of the solid lubricant after firing is increased and scattering due to bearing rotation is suppressed. It becomes easy. In particular, since the hardness of the solid lubricant is 65 or more in Shore hardness (Hs), the scattering can be more easily suppressed and the life of the bearing can be extended.

上記固形潤滑剤組込軸受が、転動体および該転動体を保持する保持器を有する転がり軸受であり、上記保持器に上記固形潤滑剤を組み込んでなるので、固形潤滑剤が保持器の一部に保持され、固形潤滑剤自体には軸受構造材に要求される程度の高い機械的強度は不要であり、その潤滑成分量や使用できるＰＶＤＦ樹脂の種類の自由度が増える。   The solid lubricant built-in bearing is a rolling bearing having a rolling element and a cage for holding the rolling element, and the solid lubricant is incorporated into the cage, so that the solid lubricant is a part of the cage. Therefore, the solid lubricant itself does not require the high mechanical strength required for the bearing structure material, and the degree of freedom of the amount of the lubricating component and the type of PVDF resin that can be used increases.

上記保持器が樹脂製保持器であり、この樹脂材料がＰＡ樹脂であり、固形潤滑剤が、該保持器に一体成形されて組み込まれているので、汎用樹脂であるＰＡ樹脂で保持器本体を形成し、これにフッ素樹脂であるＰＶＤＦ樹脂を母材とする固形潤滑剤を一体化した一部品の保持器とできる。   The cage is a resin cage, the resin material is PA resin, and the solid lubricant is integrally molded and incorporated in the cage. It is possible to form a one-piece cage which is formed and integrated with a solid lubricant whose base material is a PVDF resin which is a fluororesin.

本発明の固形潤滑剤組込軸受の一例を示す断面図である。It is sectional drawing which shows an example of the solid lubricant built-in bearing of this invention. 図１における保持器の斜視図である。It is a perspective view of the holder | retainer in FIG. 本発明の固形潤滑剤組込軸受の他の例を示す正面図および断面図である。It is the front view and sectional drawing which show the other example of the solid lubricant built-in bearing of this invention.

本発明の固形潤滑剤組込軸受は、軸受内に固形潤滑剤を組み込んだ固形潤滑剤組込軸受である。固形潤滑剤は、既存の軸受構造内の空隙部に封入する他、保持器等の軸受部材に組み込む部分を設けて、該部分に組み込む態様としてもよい。ここで、固形潤滑剤は、（Ａ）樹脂成分と（Ｂ）潤滑成分との混合物を、該樹脂成分の融点以上で加熱し、冷却固化して固形化した潤滑剤である。   The solid lubricant built-in bearing of the present invention is a solid lubricant built-in bearing in which a solid lubricant is incorporated in the bearing. In addition to encapsulating the solid lubricant in a gap in an existing bearing structure, a part to be incorporated in a bearing member such as a cage may be provided and incorporated into the part. Here, the solid lubricant is a lubricant obtained by heating a mixture of the (A) resin component and the (B) lubrication component at a melting point or higher of the resin component, solidifying by cooling and solidifying.

（Ａ）樹脂成分はＰＶＤＦ樹脂である。
本発明に使用できるＰＶＤＦ樹脂としては、フッ化ビニリデン（ＶＤＦ）の単独重合体であるホモポリマータイプと、ＶＤＦと少量の他成分を共重合したコポリマータイプ（例えば、フッ化ビニリデン−ヘキサフルオロプロピレン共重合体等）が挙げられる。曲げ強度などに優れ、軸受使用時における飛散を防止しやすいことから、ホモポリマータイプを用いることが好ましい。また、本発明に使用できるＰＶＤＦ樹脂は、α型、β型、γ型などの種々の結晶構造を有する結晶性樹脂である。 (A) The resin component is PVDF resin.
The PVDF resin that can be used in the present invention includes a homopolymer type that is a homopolymer of vinylidene fluoride (VDF), and a copolymer type that is a copolymer of VDF and a small amount of other components (for example, vinylidene fluoride-hexafluoropropylene copolymer). Polymer, etc.). It is preferable to use a homopolymer type because it is excellent in bending strength and easily prevents scattering when the bearing is used. The PVDF resin that can be used in the present invention is a crystalline resin having various crystal structures such as α-type, β-type, and γ-type.

ＰＶＤＦ樹脂の合成法としては、一般に乳化重合法または懸濁重合法が知られている。本発明では、この中でも乳化重合法で合成されたＰＶＤＦ樹脂を用いることを特徴としている。乳化重合法としては公知の方法を採用できる。例えば、フッ素系乳化剤を使用して、ＶＤＦ単独またはＶＤＦとヘキサフルオロプロピレンなどのコモノマーとを水媒体中に乳化させ、ラジカル重合開始剤を加えて撹拌しながら重合を行ない、重合後に微小なラテックスを凝集剤により析出・凝集させて、ＰＶＤＦ樹脂の粒子を回収する。乳化重合法により合成されたＰＶＤＦ樹脂粒子（パウダー）は、粒径が小さく、分子量分布が広い特徴を有するため、固形時の油保持性に優れる。また、不純物が少ない極めて高純度のポリマが得られる。なお、乳化重合法により得られたホモポリマーの結晶化度は３０％〜５０％程度である。   As a method for synthesizing a PVDF resin, an emulsion polymerization method or a suspension polymerization method is generally known. Among them, the present invention is characterized by using a PVDF resin synthesized by an emulsion polymerization method. A known method can be adopted as the emulsion polymerization method. For example, using a fluorine-based emulsifier, VDF alone or VDF and a comonomer such as hexafluoropropylene are emulsified in an aqueous medium, and polymerization is performed with stirring by adding a radical polymerization initiator. Precipitate and agglomerate with a flocculant to recover PVDF resin particles. The PVDF resin particles (powder) synthesized by the emulsion polymerization method have a small particle size and a wide molecular weight distribution, and therefore have excellent oil retention when solid. In addition, an extremely high-purity polymer with few impurities can be obtained. In addition, the crystallinity of the homopolymer obtained by the emulsion polymerization method is about 30% to 50%.

本発明に使用するＰＶＤＦ樹脂としては、樹脂温度２３２℃、せん断速度１００ｓ−１における溶融粘度（ＡＳＴＭ Ｄ ３８３５）が、１５００Ｐａ・ｓ以上であることが好ましく、２０００Ｐａ・ｓ以上がより好ましい。上記溶融粘度が１５００Ｐａ・ｓ以上であると、焼成後の固形潤滑剤の硬さ（Ｈｓ）が大きくなり、軸受回転による飛散が抑制される。また、上記溶融粘度が高すぎる場合、固形潤滑剤の成形性等に劣るため、上限としては４０００Ｐａ・ｓ以下が好ましい。上記溶融粘度のより好ましい範囲としては２３５０〜３４００Ｐａ・ｓであり、さらに好ましい範囲としては２８００〜３４００Ｐａ・ｓであり、最も好ましい範囲としては２９００〜３３００Ｐａ・ｓである。 The PVDF resin used in the present invention preferably has a melt viscosity (ASTM D 3835) at a resin temperature of 232 ° C. and a shear rate of 100 s −1 of 1500 Pa · s or more, and more preferably 2000 Pa · s or more. When the melt viscosity is 1500 Pa · s or more, the hardness (Hs) of the solid lubricant after firing increases, and scattering due to bearing rotation is suppressed. Moreover, when the melt viscosity is too high, the formability of the solid lubricant is inferior, so the upper limit is preferably 4000 Pa · s or less. A more preferable range of the melt viscosity is 2350 to 3400 Pa · s, a further preferable range is 2800 to 3400 Pa · s, and a most preferable range is 2900 to 3300 Pa · s.

本発明に使用するＰＶＤＦ樹脂の融点は、１５０〜１８０℃が好ましく、１５５〜１７５℃がより好ましい。ＰＶＤＦ樹脂の融点は、示差走査熱量計（ＤＳＣ）により測定される値である。融点が１５０℃未満であると、軸受使用温度が１５０℃をこえる環境下で使用する場合、固形潤滑剤が融解して飛散しやすくなるおそれがある。一方、融点が１８０℃をこえると、固形化の際の焼成温度が高くなり、軸受の寸法精度の低下のおそれがあり、また、汎用樹脂を用いた樹脂保持器との一体構造化が困難となる場合がある。   The melting point of the PVDF resin used in the present invention is preferably 150 to 180 ° C, more preferably 155 to 175 ° C. The melting point of PVDF resin is a value measured by a differential scanning calorimeter (DSC). If the melting point is less than 150 ° C, the solid lubricant may be easily melted and scattered when used in an environment where the bearing operating temperature exceeds 150 ° C. On the other hand, if the melting point exceeds 180 ° C., the firing temperature at the time of solidification becomes high, there is a risk that the dimensional accuracy of the bearing may be lowered, and it is difficult to make an integral structure with a resin cage using a general-purpose resin. There is a case.

ＰＶＤＦ樹脂以外の一般的なフッ素樹脂として、ポリテトラフルオロエチレン（ＰＴＦＥ）樹脂、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体（ＦＥＰ）樹脂、テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ）樹脂、エチレン−テトラフルオロエチレン共重合体（ＥＴＦＥ）樹脂、ポリクロロトリフルオロエチレン（ＰＣＴＦＥ）樹脂、エチレン−クロロトリフルオロエチレン共重合体（ＥＣＴＦＥ）樹脂などがある。これらの樹脂は固形化時の焼成が高温になり過ぎる場合があり、また焼成温度を低く抑制すると固形化自体が困難となるため、本発明においては使用できない。   General fluororesins other than PVDF resin include polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) resin , Ethylene-tetrafluoroethylene copolymer (ETFE) resin, polychlorotrifluoroethylene (PCTFE) resin, ethylene-chlorotrifluoroethylene copolymer (ECTFE) resin, and the like. These resins may not be used in the present invention because firing at the time of solidification may become too high, and if the firing temperature is kept low, solidification itself becomes difficult.

（Ｂ）潤滑成分は、フッ素グリースおよび／またはフッ素油を含む。フッ素グリースのみ、フッ素油のみ、または、これらの混合物としてもよい。本発明では、少なくともフッ素グリースを含むことが好ましい。フッ素グリースの状態で樹脂成分と固形化することでフッ素油を保持しやすくなる。 (B) The lubricating component contains fluorine grease and / or fluorine oil. Only fluorine grease, only fluorine oil, or a mixture thereof may be used. In the present invention, it is preferable to include at least fluorine grease. It becomes easy to hold fluorine oil by solidifying the resin component in the state of fluorine grease.

本発明に使用できるフッ素油としては、脂肪族炭化水素ポリエーテルの水素原子をフッ素原子で置換した化合物であるパーフルオロポリエーテル（ＰＦＰＥ）油が挙げられる。特に、耐熱性や耐酸化劣化性に優れることから、水素原子を完全にフッ素原子で置換したものが好ましい。また、上記ＰＦＰＥ油としては、直鎖状、側鎖を有するもののいずれも使用できる。フッ素油は、１種類単独でも、２種類以上を混合しても使用できる。   Examples of the fluorine oil that can be used in the present invention include perfluoropolyether (PFPE) oil, which is a compound in which a hydrogen atom of an aliphatic hydrocarbon polyether is substituted with a fluorine atom. In particular, those in which hydrogen atoms are completely substituted with fluorine atoms are preferable because of excellent heat resistance and oxidation deterioration resistance. Moreover, as said PFPE oil, what has a linear form and a side chain can be used. Fluorine oil can be used alone or in combination of two or more.

本発明に使用できるフッ素グリースは、上記フッ素油を基油とし、フッ素樹脂粒子を増ちょう剤とするグリースである。フッ素グリースの増ちょう剤とするフッ素樹脂粒子は、上記ＰＦＰＥ油などのフッ素系油と親和性が高く、高温安定性、耐薬品性を有する粉末が使用できる。フッ素樹脂としては、ＰＴＦＥ樹脂、ＰＦＡ樹脂、ＦＥＰ樹脂などのパーフルオロ系フッ素樹脂が挙げられる。これらの中でも、ＰＴＦＥ樹脂が高温安定性などに優れているため好ましい。これらの増ちょう剤は、１種類単独でも、２種類以上を混合しても使用できる。   The fluorine grease that can be used in the present invention is a grease that uses the above-mentioned fluorine oil as a base oil and fluorine resin particles as a thickener. Fluorine resin particles used as a thickener for fluorine grease can be used as a powder having high affinity with fluorine-based oils such as the above-mentioned PFPE oil and having high temperature stability and chemical resistance. Examples of the fluororesin include perfluoro fluororesins such as PTFE resin, PFA resin, and FEP resin. Among these, PTFE resin is preferable because it has excellent high-temperature stability. These thickeners can be used alone or in combination of two or more.

フッ素グリースのベースグリース組成としては、フッ素油を５０〜９５重量％、増ちょう剤であるフッ素樹脂粒子を５０〜５重量％することが好ましい。樹脂成分と固形化するため、グリースとして軸受に直接封入する場合よりも、増ちょう剤量を少なくできる。   The base grease composition of the fluorine grease is preferably 50 to 95% by weight of fluorine oil and 50 to 5% by weight of fluorine resin particles as a thickener. Since it is solidified with the resin component, the amount of the thickener can be reduced as compared with the case where it is directly sealed in the bearing as grease.

また、潤滑成分には、必要に応じて公知の添加剤を含有させることができる。添加剤として、例えば、有機亜鉛化合物、アミン系化合物などの酸化防止剤、ベンゾトリアゾールなどの金属不活性剤、ポリメタクリレート、ポリスチレンなどの粘度指数向上剤、二硫化モリブデン、グラファイトなどの固体潤滑剤、金属スルホネート、ポリアルコールエステルなどの防錆剤、有機モリブデンなどの摩擦低減剤、エステル、アルコールなどの油性剤、りん系化合物などの摩耗防止剤などが挙げられる。これらは１種類単独でも、２種類以上を組み合せて添加することもできる。   The lubricating component can contain a known additive as required. Examples of additives include antioxidants such as organic zinc compounds and amine compounds, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, solid lubricants such as molybdenum disulfide and graphite, Examples thereof include rust preventives such as metal sulfonates and polyalcohol esters, friction reducing agents such as organic molybdenum, oily agents such as esters and alcohols, and antiwear agents such as phosphorus compounds. These may be added alone or in combination of two or more.

固形潤滑剤を形成する混合物における（Ａ）樹脂成分および（Ｂ）潤滑成分の配合割合は、潤滑成分と樹脂成分との混合物全体に対して、樹脂成分が１０〜４０体積％、潤滑成分が６０〜９０体積％の割合とする。樹脂成分：１５〜３５体積％、潤滑成分：６５〜８５体積％が好ましく、樹脂成分：２０〜３０体積％、潤滑成分：７０〜８０体積％がより好ましい。樹脂成分が１０体積％未満であると、固形化が困難であり、軸受使用時に飛散等のおそれもある。樹脂成分が４０体積％をこえると、潤滑成分量が不足し、潤滑成分供給性に劣る。本発明では、樹脂固形潤滑剤そのもので保持器等の軸受部材を形成するのではなく、既存の保持器等の軸受部材に組み込んで使用する、または、軸受空隙部に封入して使用するものであるため、固形潤滑剤に軸受構造材として耐え得る程度の機械的強度は不要であり、潤滑成分量を上記範囲に示すように多量に配合できる。   The blending ratio of the (A) resin component and the (B) lubrication component in the mixture forming the solid lubricant is such that the resin component is 10 to 40% by volume and the lubrication component is 60 with respect to the entire mixture of the lubrication component and the resin component. It is set as the ratio of -90 volume%. Resin component: 15 to 35% by volume, lubrication component: 65 to 85% by volume is preferable, resin component: 20 to 30% by volume, and lubrication component: 70 to 80% by volume are more preferable. If the resin component is less than 10% by volume, solidification is difficult, and there is a risk of scattering when the bearing is used. When the resin component exceeds 40% by volume, the amount of the lubricating component is insufficient, and the lubricating component supply ability is poor. In the present invention, the resin solid lubricant itself is not used to form a bearing member such as a cage, but is used by being incorporated in a bearing member such as an existing cage or enclosed in a bearing gap. Therefore, the mechanical strength that can withstand the solid lubricant as a bearing structure material is not necessary, and the amount of the lubricating component can be blended in a large amount as shown in the above range.

本発明の固形潤滑剤組込軸受における固形潤滑剤は、上述の樹脂成分と潤滑成分との混合物を、該樹脂成分の融点以上で加熱し、冷却固化して固形化した潤滑剤である。樹脂成分と潤滑成分との混合物の加熱（焼成）は、該混合物が充填された保持器等の軸受部材ごと、または、該混合物が空隙部に封入された軸受ごと行なうことができる。また、保持器等の軸受部材を金型内に配置して、これに上記混合物を用いて固形潤滑剤をインサート射出成形する態様としてもよい。混合物は加熱焼成・冷却固化されて、充填空間の形状を有するとともに潤滑成分が含浸された固形潤滑剤として得られる。   The solid lubricant in the solid lubricant built-in bearing of the present invention is a lubricant obtained by heating the mixture of the resin component and the lubrication component above the melting point of the resin component, solidifying by cooling and solidifying. The heating (firing) of the mixture of the resin component and the lubricating component can be performed for each bearing member such as a cage filled with the mixture or for each bearing in which the mixture is sealed in the gap. Moreover, it is good also as an aspect which arrange | positions bearing members, such as a holder | retainer, in a metal mold | die, and insert injection-molds a solid lubricant using the said mixture for this. The mixture is heated and fired and cooled and solidified to obtain a solid lubricant having a shape of a filling space and impregnated with a lubricating component.

また、混合物を軸受部材内や軸受内に充填する以外の方法として、成形用金型内に充填後、加熱・冷却固化してもよく、また成形用金型を用いずに加熱・冷却固化させることもできる。成形用金型を用いずに固形化した固形潤滑剤は、裁断や研削等で目的の形状に後加工して軸受部材内や軸受内に組み込むことができる。これらの方法の中で後加工が不要であることから、混合物を軸受部材内や軸受内に充填する方法を採用することが作業面、コスト面で好ましい。また、固形潤滑剤を保持器等の樹脂製の軸受部材に組み込む場合は、軸受部材と固形潤滑剤とを公知の２色成形により射出成形等することで、製造効率に優れる。   Further, as a method other than filling the mixture in the bearing member or the bearing, it may be solidified by heating / cooling after filling into the molding die, or may be solidified by heating / cooling without using the molding die. You can also. The solid lubricant solidified without using a molding die can be post-processed into a desired shape by cutting, grinding, or the like, and incorporated in the bearing member or the bearing. Since post-processing is unnecessary among these methods, it is preferable in terms of work and cost to employ a method of filling the mixture in the bearing member or the bearing. Further, when the solid lubricant is incorporated in a resin bearing member such as a cage, the production efficiency is excellent by injection molding the bearing member and the solid lubricant by a known two-color molding.

樹脂成分と潤滑成分とを混合する方法は、特に限定されることなく、例えばヘンシェルミキサー、リボンミキサー等、一般に用いられる撹拌機を使用することができる。また、加熱（焼成）温度は、樹脂成分であるＰＶＤＦ樹脂の融点（１５０〜１８０℃）以上とする。ＰＶＤＦ樹脂の融点より低いと樹脂粉末（パウダー）が溶融せず固形化できない。また、ＰＶＤＦ樹脂は、３５０℃程度以上の温度に加熱するとＨＦガスを発生して分解する。ＰＶＤＦ樹脂は、融点と上記分解点までの加工可能な温度領域が広いが、本発明では融点〜融点＋３０℃の範囲で加熱焼成することが好ましい。このようなＰＶＤＦ樹脂の融点近傍範囲で加熱焼成を行なうことで、高温焼成による軸受の寸法精度および硬度の低下を防止でき、また、樹脂製保持器等の軸受部材の材質として汎用的な樹脂（例えば、ＰＡ６６）を採用できる。   The method of mixing the resin component and the lubricating component is not particularly limited, and a commonly used stirrer such as a Henschel mixer or a ribbon mixer can be used. Moreover, heating (baking) temperature shall be more than melting | fusing point (150-180 degreeC) of PVDF resin which is a resin component. If the melting point of the PVDF resin is lower, the resin powder (powder) does not melt and cannot be solidified. PVDF resin decomposes by generating HF gas when heated to a temperature of about 350 ° C. or higher. The PVDF resin has a wide melting temperature and a processable temperature range up to the above decomposition point, but in the present invention, it is preferably heated and fired in the range of the melting point to the melting point + 30 ° C. By performing baking in the vicinity of the melting point of such PVDF resin, it is possible to prevent a decrease in the dimensional accuracy and hardness of the bearing due to high-temperature baking, and a general-purpose resin (as a material for bearing members such as resin cages) For example, PA66) can be employed.

本発明の固形潤滑剤組込軸受における固形潤滑剤の硬さは、ＡＳＴＭ Ｄ ２２４０Ａ（スプリング式）によるショア硬さ（Ｈｓ）で６５以上であることが好ましい。この範囲であると、軸受回転による飛散を抑制しやすくなる。好ましくは６５〜９０である。   The hardness of the solid lubricant in the solid lubricant built-in bearing of the present invention is preferably 65 or more in Shore hardness (Hs) according to ASTM D 2240A (spring type). Within this range, scattering due to bearing rotation can be easily suppressed. Preferably it is 65-90.

本発明の固形潤滑剤組込軸受の一例を図１および図２に基づき説明する。図１は、本発明の固形潤滑剤組込軸受として樹脂製の冠型保持器に固形潤滑剤を組み込んだ転がり軸受の断面図であり、図２は上記冠型保持器の斜視図である。図１に示すように、固形潤滑剤組込軸受１は、外周面に転走面２ａを有する内輪２と、内周面に転走面３ａを有する外輪３とが同心に配置される。内輪の転走面２ａと外輪の転走面３ａとの間に複数個の転動体４が介在して配置される。この複数個の転動体４が、固形潤滑剤６を組み込んだ樹脂製の保持器５により保持される。保持器５の固形潤滑剤６から徐々に滲み出す潤滑成分が、軸回転により転走面に飛散して潤滑がなされる。固形潤滑剤６を保持器５に組み込んだ形状とすることで、固形潤滑剤が転走面と密着することを防止でき、回転初期においてトルクが高くなることを防止できる。なお、必要に応じて、低トルクを維持できる範囲で、上記固形潤滑剤とは別に、少量のグリースを予め軸受内に封入しておいてもよい。   An example of the solid lubricant built-in bearing of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a rolling bearing in which a solid lubricant is incorporated into a resin-made crown cage as a solid lubricant built-in bearing of the present invention, and FIG. 2 is a perspective view of the crown cage. As shown in FIG. 1, in the solid lubricant built-in bearing 1, an inner ring 2 having a rolling surface 2a on an outer peripheral surface and an outer ring 3 having a rolling surface 3a on an inner peripheral surface are arranged concentrically. A plurality of rolling elements 4 are disposed between the rolling surface 2a of the inner ring and the rolling surface 3a of the outer ring. The plurality of rolling elements 4 are held by a resin cage 5 in which a solid lubricant 6 is incorporated. Lubricating components that gradually ooze out from the solid lubricant 6 of the cage 5 are scattered on the rolling surface by the shaft rotation and lubricated. By adopting a shape in which the solid lubricant 6 is incorporated in the cage 5, the solid lubricant can be prevented from coming into close contact with the rolling surface, and torque can be prevented from increasing at the initial stage of rotation. If necessary, a small amount of grease may be enclosed in the bearing in advance in addition to the solid lubricant as long as low torque can be maintained.

図２に示すように、樹脂製の保持器５は、環状の本体７上面に周方向に一定ピッチをおいて対向一対の保持爪８を形成し、その対向する各保持爪８を相互に接近する方向にわん曲させるとともに、その保持爪８間に転動体である玉を保持する転動体保持用ポケット９を形成したものである。隣接するポケット９における相互に隣接する保持爪８の背面相互間に、保持爪８の立ち上がり基準面となる平坦部１０が形成される。固形潤滑剤６は、保持爪８の背面相互間において、環状の本体７のポケット開口部の反対面と環状外径面に露出した形で組み込まれている。保持器５に該固形潤滑剤６を組み込む空間部分が形成されている。この空間部分は、上述のとおり、保持爪８の背面相互間（隣接するポケット９の間）の環状外径面（外輪側面）を切り抜いて設けられている。また、環状内径面（内輪側面）を切り抜く形状としてもよい。固形潤滑剤６の該部分への組み込みは、上述のとおり、固形潤滑剤６の成形後であっても、混合物の状態で封入して固形化してもよい。   As shown in FIG. 2, the resin cage 5 has a pair of opposed holding claws 8 formed on the upper surface of the annular main body 7 at a constant pitch in the circumferential direction, and the opposed holding claws 8 approach each other. A rolling element holding pocket 9 for holding a ball as a rolling element is formed between the holding claws 8. A flat portion 10 is formed between the back surfaces of the holding claws 8 adjacent to each other in the adjacent pockets 9 as a rising reference surface of the holding claws 8. The solid lubricant 6 is incorporated between the back surfaces of the holding claws 8 so as to be exposed on the surface opposite to the pocket opening of the annular main body 7 and on the annular outer diameter surface. A space for incorporating the solid lubricant 6 into the cage 5 is formed. As described above, this space portion is provided by cutting out the annular outer diameter surface (side surface of the outer ring) between the back surfaces of the holding claws 8 (between adjacent pockets 9). Moreover, it is good also as a shape which cuts out an annular internal surface (inner ring side surface). As described above, the solid lubricant 6 may be incorporated into the portion, and may be solidified by being sealed in a mixture state even after the solid lubricant 6 is molded.

保持器５の樹脂材料としては、射出成形可能であり、保持器として十分な耐熱性、機械的強度、弾性率を有するものであればよい。例えば、ポリエーテルエーテルケトン（ＰＥＥＫ）樹脂、ポリフェニレンスルフィド（ＰＰＳ）樹脂、熱可塑性ポリイミド樹脂、ポリアミドイミド樹脂、ＰＡ６６樹脂、ＰＡ４６樹脂などのポリアミド樹脂を母材とするものが挙げられる。これらは単独で使用しても、ポリマーアロイとして混合して使用してもよい。固形潤滑剤を混合物の状態で充填して保持器ごと加熱焼成やインサート射出成形する場合であっても、固形潤滑剤母材がＰＶＤＦ樹脂であり、その加熱焼成温度を比較的低温に抑えることができるので、上記ＰＡ６６樹脂やＰＡ４６樹脂も好適に利用できる。   The resin material of the cage 5 may be any material that can be injection-molded and has sufficient heat resistance, mechanical strength, and elastic modulus as the cage. Examples thereof include those based on a polyamide resin such as polyether ether ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, thermoplastic polyimide resin, polyamideimide resin, PA66 resin, PA46 resin. These may be used alone or in combination as a polymer alloy. Even when solid lubricant is filled in a mixture and the entire cage is heated and fired or insert injection molded, the solid lubricant base material is PVDF resin, and the heating and firing temperature can be kept relatively low. Therefore, the PA66 resin and PA46 resin can also be suitably used.

また、保持器５の樹脂材料には、機械的強度、弾性率を上げる目的や、耐熱劣化性を改善する目的で、強化繊維等の充填剤や添加剤を配合してもよい。例えば、強化繊維としては、ＰＡＮ系炭素繊維、ピッチ系炭素繊維、ガラス繊維、アラミド繊維、ウィスカ類などが挙げられ、添加剤としては、固体潤滑剤、酸化防止剤、可塑剤、着色剤、離型剤などが挙げられる。   Moreover, you may mix | blend fillers and additives, such as a reinforced fiber, in the resin material of the holder | retainer 5 in order to raise mechanical strength and an elasticity modulus, or to improve heat-resistant deterioration property. Examples of reinforcing fibers include PAN-based carbon fibers, pitch-based carbon fibers, glass fibers, aramid fibers, whiskers, etc., and additives include solid lubricants, antioxidants, plasticizers, colorants, release agents. Examples include molds.

固形潤滑剤６の組み込み位置は、特に限定されず、滲み出す潤滑成分を転走面に供給可能な位置であれば保持器の任意の箇所とできる。また、本発明の固形潤滑剤組込軸受は、保持器以外のシール部材等に固形潤滑剤を組み込む態様としてもよい。さらに、保持器等における固形潤滑剤組み込み用の空間部と固形潤滑剤との嵌合形状を、該固形潤滑剤の抜け止めとなるようなアンダーカット形状とすることもできる。保持器を樹脂製保持器とすることで、このような嵌合形状の形成が容易となる。   The installation position of the solid lubricant 6 is not particularly limited, and can be an arbitrary portion of the cage as long as the lubricant component that exudes can be supplied to the rolling surface. Moreover, the solid lubricant built-in bearing of this invention is good also as an aspect which incorporates a solid lubricant in sealing members other than a holder | retainer. Furthermore, the fitting shape of the space for incorporating the solid lubricant in the cage or the like and the solid lubricant can be an undercut shape that prevents the solid lubricant from coming off. By forming the cage as a resin cage, it is easy to form such a fitting shape.

本発明の固形潤滑剤組込軸受において、内・外輪は、軸受鋼等の軸受材料として一般的に使用される鋼材で構成される。また、保持器については、図２では樹脂製の冠型保持器であるが、これに限定されず、金属板（波型）保持器なども適宜採用できる。   In the solid lubricant built-in bearing of the present invention, the inner and outer rings are made of a steel material generally used as a bearing material such as bearing steel. Further, the cage is a resin-made crown cage in FIG. 2, but is not limited to this, and a metal plate (wave type) cage or the like can be appropriately employed.

本発明の固形潤滑剤組込軸受の他の例を図３に示す。図３は、本発明の固形潤滑剤組込軸受として固形潤滑を軸受空隙部（フルパック状）に封入した転がり軸受の正面図（図３（ａ））および断面図（図３（ｂ））である。図３（ａ）および図３（ｂ）に示すように、固形潤滑剤組込軸受１１は、内輪１２および外輪１３と、この内輪１２および外輪１３との間に介在する転動体１４と、転動体１４を保持する保持器１５とを備える。この転動体１４の周囲に、固形前の上記混合物を充填して焼成することで軸受内で固形化し、固形潤滑剤１６が封入された軸受としている。図３に示す例では、固形潤滑剤１６は、内輪１２と外輪１３の間全体に、フルパック状に充填しているが、これに限定されず、部分的にスポットパック状に封入してもよい。なお、封入する際は、必要に応じて軸受１１の側面に金具で蓋をし、固形潤滑剤が漏れない様にする。   Another example of the solid lubricant built-in bearing of the present invention is shown in FIG. FIG. 3 is a front view (FIG. 3 (a)) and a cross-sectional view (FIG. 3 (b)) of a rolling bearing in which solid lubricant is sealed in a bearing gap (full pack shape) as a solid lubricant built-in bearing of the present invention. It is. As shown in FIGS. 3A and 3B, the solid lubricant built-in bearing 11 includes an inner ring 12 and an outer ring 13, a rolling element 14 interposed between the inner ring 12 and the outer ring 13, and a rolling element. And a cage 15 that holds the moving body 14. The rolling element 14 is filled with the mixture before solidification and fired to solidify in the bearing, and the solid lubricant 16 is sealed. In the example shown in FIG. 3, the solid lubricant 16 is filled in a full pack shape between the inner ring 12 and the outer ring 13. However, the solid lubricant 16 is not limited to this and may be partially enclosed in a spot pack shape. Good. In addition, when enclosing, if necessary, the side surface of the bearing 11 is covered with a metal fitting so that the solid lubricant does not leak.

固形潤滑剤を軸受内の空隙部（保持器と内・外輪との空間、保持器のない転がり軸受における内・外輪間の空間など）に封入した場合、転走面近くに固形潤滑剤が存在し、潤滑成分が転走面に供給されやすいという利点がある。また、外部からの塵・水分等の侵入に対してはシールの役割も果たす。   When solid lubricant is sealed in the gap in the bearing (space between the cage and inner / outer ring, space between inner / outer rings in a rolling bearing without a cage, etc.), there is solid lubricant near the rolling surface. However, there is an advantage that the lubricating component is easily supplied to the rolling surface. It also serves as a seal against entry of dust, moisture, etc. from the outside.

以上、図１〜図３に基づき、本発明の固形潤滑剤組込軸受を説明したが、軸受形態はこれに限定されるものではない。軸受形式としては、例えば、玉軸受、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のころ軸受や、滑り軸受としてもよい。   As mentioned above, although the solid lubricant built-in bearing of this invention was demonstrated based on FIGS. 1-3, a bearing form is not limited to this. Bearing types include, for example, ball bearings, cylindrical roller bearings, tapered roller bearings, self-aligning roller bearings, needle roller bearings, thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings, thrust self-aligning rollers It may be a roller bearing such as a bearing or a sliding bearing.

以下に、実施例および比較例を挙げて本発明をさらに説明するが、本発明は、これによって何ら制限されるものではない。   Hereinafter, the present invention will be further described with reference to examples and comparative examples, but the present invention is not limited thereto.

実施例１〜実施例７
表１に示す組成で樹脂成分と潤滑成分とを混合し、この混合物をＰＶＤＦ樹脂の融点以上（１８０℃）で加熱し、冷却（放冷）固化して固形化して固形潤滑剤の試験片を作成した。この試験片の硬さを、ＡＳＴＭ Ｄ ２２４０Ａ（スプリング式）による測定で測定し、１８０℃焼結後の硬さ（ショア硬さ（Ｈｓ））として表１に記載した。 Examples 1 to 7
A resin component and a lubricating component are mixed in the composition shown in Table 1, and the mixture is heated at a melting point or higher (180 ° C.) of the PVDF resin, cooled (cooled), solidified by solidification, and a solid lubricant test piece is prepared. Created. The hardness of this test piece was measured by the measurement by ASTM D 2240A (spring type) and listed in Table 1 as the hardness after calcination at 180 ° C. (Shore hardness (Hs)).

また、図２に示す形状の保持器をＰＡ６６樹脂を用いて射出成形した。保持器における固形潤滑剤組み込み用の空間部は、隣接するポケット間の外輪側の壁を切抜くことで設けた。この空間部分に、各実施例および比較例で示す組成の混合物を充填し、保持器ごと上記条件で加熱して固形化し、固形潤滑剤が一体に組み込まれた自己潤滑性樹脂保持器を作成した。この自己潤滑性樹脂保持器を玉軸受６２０４（ＮＴＮ社製、内径２０ｍｍ、外径：４７ｍｍ、幅：１４ｍｍ）に組み込んで試験軸受とし、所定の軸受寿命試験に供した。軸受寿命試験は、回転数条件：２０００ｍｉｎ−１、荷重条件：Ｆａ＝Ｆｒ＝６７Ｎ、温度条件：１５０℃、で行なった。この試験において、固形潤滑剤が少しでも飛散していることを目視で確認した時点で打切りとし、試験開始からそれまでの時間を軸受寿命時間（ｈ）とした。結果を表１に示す。なお、軸受の実使用に際しては、飛散の程度が僅かである場合には、特に問題なく運転が可能である。 Further, a cage having the shape shown in FIG. 2 was injection molded using PA66 resin. A space for incorporating the solid lubricant in the cage was provided by cutting out a wall on the outer ring side between adjacent pockets. The space portion was filled with a mixture having the composition shown in each of the examples and comparative examples, and the entire cage was heated and solidified under the above conditions, thereby creating a self-lubricating resin cage in which a solid lubricant was integrally incorporated. . This self-lubricating resin cage was incorporated into a ball bearing 6204 (manufactured by NTN, inner diameter 20 mm, outer diameter: 47 mm, width: 14 mm) as a test bearing and subjected to a predetermined bearing life test. The bearing life test was performed under the rotation speed condition: 2000 min −1 , the load condition: Fa = Fr = 67 N, and the temperature condition: 150 ° C. In this test, when it was visually confirmed that the solid lubricant was scattered even a little, it was discontinued, and the time from the start of the test to that time was defined as the bearing life time (h). The results are shown in Table 1. In actual use of the bearing, if the degree of scattering is slight, operation is possible without any particular problem.

比較例１〜４
表２に示す組成で樹脂成分と潤滑成分とを混合し、この混合物を実施例１と同じ条件で加熱し、冷却（放冷）固化して固形化を試みた。しかしながら、いずれの場合も十分に固まらず、硬さ試験、軸受寿命試験に供することはできなかった。 Comparative Examples 1-4
A resin component and a lubricating component were mixed in the composition shown in Table 2, and this mixture was heated under the same conditions as in Example 1, solidified by cooling (cooling) and solidification. However, in either case, it was not sufficiently hardened and could not be used for a hardness test or a bearing life test.

なお、実施例および比較例に用いたＰＶＤＦ樹脂の重合方法や溶融粘度は各表に示すとおりであり、表中「Ｈｙｌａｒ」「Ｋｙｎａｒ」「ＮＯＸＬＵＢ」「Ｋｒｙｔｏｘ」「Ｈａｌａｒ」は、それぞれ登録商標である。   The polymerization methods and melt viscosities of the PVDF resins used in Examples and Comparative Examples are as shown in each table. In the tables, “Hylar”, “Kynar”, “NOXLUB”, “Krytox”, and “Halar” are registered trademarks. is there.

Figure 2015121276
Figure 2015121276

Figure 2015121276
Figure 2015121276

表１に示すように、各実施例の固形潤滑剤組込軸受では、十分に固形化された固形潤滑剤が得られた。特に、溶融粘度が１５００Ｐａ・ｓ以上である実施例１〜６では、固形潤滑剤の硬さ（Ｈｓ）が６５以上であり、飛散をより防止でき、長寿命化を図れることが分かる。   As shown in Table 1, in the solid lubricant built-in bearing of each example, a sufficiently solidified solid lubricant was obtained. In particular, in Examples 1 to 6 in which the melt viscosity is 1500 Pa · s or more, it is understood that the solid lubricant has a hardness (Hs) of 65 or more, which can further prevent scattering and extend the life.

本発明の固形潤滑剤組込軸受は、高温環境下での使用においても、低トルク化および長寿命化が図れ、さらに任意の樹脂材料による樹脂製保持器を利用でき、自動車や産業用機器などに用いる軸受として多様な用途に好適に利用できる。   The solid lubricant built-in bearing of the present invention can achieve low torque and long life even when used in a high temperature environment, and can use a resin cage made of any resin material, such as automobiles and industrial equipment. It can be suitably used for various applications as a bearing used in the above.

１、１１ 固形潤滑剤組込軸受
２、１２ 内輪
３、１３ 外輪
４、１４ 転動体
５、１５ 保持器
６、１６ 固形潤滑剤
７ 保持器本体
８ 保持爪
９ ポケット
１０ 平坦部 DESCRIPTION OF SYMBOLS 1,11 Solid lubricant built-in bearing 2,12 Inner ring 3,13 Outer ring 4,14 Rolling element 5,15 Cage 6,16 Solid lubricant 7 Cage body 8 Claw 9 Pocket 10 Flat part

Claims (6)

軸受内に固形潤滑剤を組み込んだ固形潤滑剤組込軸受であって、
前記固形潤滑剤は、樹脂成分と潤滑成分との混合物を、該樹脂成分の融点以上で加熱し、冷却固化して固形化した潤滑剤であり、
前記樹脂成分が乳化重合法で合成されたポリフッ化ビニリデン樹脂であり、前記潤滑成分がフッ素グリースおよび／またはフッ素油を含み、
前記混合物全体に対して、前記樹脂成分が１０〜４０体積％、前記潤滑成分が６０〜９０体積％の割合で含まれることを特徴とする固形潤滑剤組込軸受。 A solid lubricant built-in bearing in which a solid lubricant is incorporated in the bearing,
The solid lubricant is a lubricant obtained by heating a mixture of a resin component and a lubricating component at a melting point or higher of the resin component, solidifying by cooling,
The resin component is a polyvinylidene fluoride resin synthesized by an emulsion polymerization method, and the lubricating component contains fluorine grease and / or fluorine oil,
A solid lubricant built-in bearing comprising 10 to 40% by volume of the resin component and 60 to 90% by volume of the lubricating component with respect to the entire mixture. 前記ポリフッ化ビニリデン樹脂は、樹脂温度２３２℃、せん断速度１００ｓ−１における溶融粘度が１５００Ｐａ・ｓ以上であることを特徴とする請求項１記載の固形潤滑剤組込軸受。 2. The solid lubricant built-in bearing according to claim 1, wherein the polyvinylidene fluoride resin has a melt viscosity of 1500 Pa · s or more at a resin temperature of 232 ° C. and a shear rate of 100 s −1 . 前記固形潤滑剤の硬さが、ショア硬さ（Ｈｓ）で６５以上であることを特徴とする請求項１または請求項２記載の固形潤滑剤組込軸受。   The solid lubricant built-in bearing according to claim 1, wherein the solid lubricant has a Shore hardness (Hs) of 65 or more. 前記固形潤滑剤組込軸受が、転動体および該転動体を保持する保持器を有する転がり軸受であり、
前記保持器に前記固形潤滑剤を組み込んでなることを特徴とする請求項１、請求項２または請求項３記載の固形潤滑剤組込軸受。 The solid lubricant built-in bearing is a rolling bearing having a rolling element and a cage for holding the rolling element,
The solid lubricant built-in bearing according to claim 1, wherein the solid lubricant is incorporated in the cage. 前記保持器が樹脂製保持器であることを特徴とする請求項４記載の固形潤滑剤組込軸受。   The solid lubricant built-in bearing according to claim 4, wherein the cage is a resin cage. 前記樹脂製保持器の樹脂材料がポリアミド樹脂であり、
前記固形潤滑剤が、前記保持器に一体成形されて組み込まれていることを特徴とする請求項５記載の固形潤滑剤組込軸受。 The resin material of the resin cage is a polyamide resin,
The solid lubricant built-in bearing according to claim 5, wherein the solid lubricant is integrally formed and incorporated in the cage.
JP2013265611A 2013-12-24 2013-12-24 Solid lubricant assembled bearing Pending JP2015121276A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3628882B1 (en) * 2018-09-26 2022-11-09 Aktiebolaget SKF Motor vehicle wheel or motorcycle oscillation roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3628882B1 (en) * 2018-09-26 2022-11-09 Aktiebolaget SKF Motor vehicle wheel or motorcycle oscillation roller bearing

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