JP2007177949A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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JP2007177949A
JP2007177949A JP2005379062A JP2005379062A JP2007177949A JP 2007177949 A JP2007177949 A JP 2007177949A JP 2005379062 A JP2005379062 A JP 2005379062A JP 2005379062 A JP2005379062 A JP 2005379062A JP 2007177949 A JP2007177949 A JP 2007177949A
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outer ring
mass
rolling bearing
elastic member
inner ring
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Takahiko Uchiyama
貴彦 内山
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NSK Ltd
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NSK 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
    • F16C33/7856—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race with a single sealing lip

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing having sufficient rust preventive properties even if a large amount of rust preventive oil is not applied thereto. <P>SOLUTION: This deep groove ball bearing comprises: an inner ring 1; an outer ring 2; a plurality of balls 3 rollingly disposed between the inner ring 1 and the outer ring 2; a cage 4 holding the balls 3 between the inner ring 1 and the outer ring 2; and seals 5, 5 mounted on the inner peripheral surfaces of the outer ring 2 at both ends. The seal 5 is formed by molding a ring-like core 5a integrally with a resin elastic member 5b. The resin elastic member 5b is made of a resin composition in which a volatile corrosion inhibitor is mixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は転がり軸受に関する。   The present invention relates to a rolling bearing.

各種装置や機器の回転支持部分には転がり軸受が組み込まれるが、通常このような転がり軸受には、封入されたグリースの漏洩や外部からの異物の侵入を防ぐためにシールが取り付けられている。この転がり軸受の内輪，外輪，転動体は、通常軸受鋼と呼ばれる高炭素クロム鋼（ＪＩＳ Ｇ４８０５又はＡＩＳＩ ５２１００）で構成されているが、この鋼は錆び易いので、保管や出荷に際しては、転がり軸受の内部や表面に多量の防錆油が塗布されている。
特開２０００−２０５２８１号公報 特開平１１−３３６７６５号公報 特開平８−１４３０６９号公報 特開２０００−１２０７０９号公報 Rolling bearings are incorporated in the rotation support portions of various devices and devices. Usually, seals are attached to such rolling bearings in order to prevent leakage of encapsulated grease and intrusion of foreign substances from the outside. The inner ring, outer ring, and rolling element of this rolling bearing are made of high-carbon chromium steel (JIS G4805 or AISI 52100), usually called bearing steel, but this steel is easily rusted. A large amount of rust preventive oil is applied to the inside and the surface of the.
JP 2000-205281 A JP 11-336765 A JP-A-8-143069 JP 2000-120709 A

ところで、転がり軸受は、その用途や目的によって内輪や外輪に別部材が取り付けられる場合がある。例えば、事務機器等に使用される転がり軸受や自動車のアイドラプーリー用の軸受では、外輪に樹脂製のローラー，歯車，プーリをインサート成形や圧入によって取り付ける場合がある。しかしながら、その場合に、外輪の外径面に塗布されている防錆油の塗布量が多すぎると、インサート成形時に防錆油を巻込んで成形不良となるおそれがある。   By the way, another member may be attached to an inner ring or an outer ring depending on the application or purpose of the rolling bearing. For example, in a rolling bearing used for office equipment or a bearing for an automobile idler pulley, a resin roller, gear, and pulley may be attached to the outer ring by insert molding or press-fitting. However, in that case, if the amount of the rust preventive oil applied to the outer diameter surface of the outer ring is too large, the rust preventive oil may be entrained during insert molding, resulting in a molding failure.

そうすると、樹脂本来の強度が発現できず転がり軸受の使用中に破損したり、外輪とローラー，歯車，プーリとの固定力が低下し、長時間の稼働の間に両者の間に滑りが生じてローラー，歯車，プーリが脱落してしまうおそれがある。
そこで、従来は、樹脂製のローラー，歯車，プーリをインサート成形する場合には、事前に表面の防錆油を拭き取っていた。しかしながら、拭き取りが不十分もしくは過剰である場合があった。また、拭き取り中に水分が混入して、錆が発生するという問題もあった。 If it does so, the original strength of the resin cannot be expressed and it will be damaged during use of the rolling bearing, or the fixing force between the outer ring and the rollers, gears and pulleys will be reduced, causing slippage between the two during long-time operation. Rollers, gears, and pulleys may fall off.
Thus, conventionally, when insert molding resin rollers, gears, and pulleys, the rust preventive oil on the surface has been wiped off in advance. However, the wiping may be insufficient or excessive. In addition, there was a problem that water was mixed during wiping and rust was generated.

また、ＶＴＲのドラムスピンドル用等の精密小型モータ等に使用される転がり軸受では、内輪と軸との固定及び外輪とハウジングとの固定を接着剤で行うことが多いが、この場合も内輪の内径面や外輪の外径面の防錆油の塗布量が多すぎると、接着剤が固化しなかったり、または接着力が低下するという問題が生じる。さらに、防錆油の塗布量が多すぎると、転がり軸受の周辺を汚染するという問題もある。   Also, in rolling bearings used for precision small motors for VTR drum spindles, etc., the inner ring and shaft and the outer ring and housing are often fixed with an adhesive. If the coating amount of the rust preventive oil on the surface or outer diameter surface of the outer ring is too large, there arises a problem that the adhesive does not solidify or the adhesive strength decreases. Furthermore, when there is too much application | coating amount of rust preventive oil, there also exists a problem of contaminating the periphery of a rolling bearing.

さらに、シールを備え内部にグリースが封入された密封軸受においても、製造された転がり軸受は機器に組み込まれるまでの在庫期間中はほとんど回転されないために、封入したグリースが軸受の軌道面や転動体の転動面の隅々まで十分に付着していることは少ない。内輪，外輪，転動体のグリースが付着している部分は空気との接触が遮断されているため錆が発生することはないが、グリースが付着していない部分では錆が発生するおそれがある。   Furthermore, even in sealed bearings that have a seal and are sealed with grease, the manufactured rolling bearing is hardly rotated during the inventory period until it is incorporated into equipment. There is little adhesion to every corner of the rolling surface. The inner ring, the outer ring, and the rolling parts where the grease is attached do not generate rust because the contact with the air is blocked, but there is a possibility that rust may occur in the parts where the grease does not adhere.

このような事情に鑑み、特許文献４には、軸受内径を構成する表面及び軸受外径を構成する表面に、４０℃における動粘度が７〜１２０ｍｍ2 ／ｓの鉱油系、合成炭化水素系、又はフッ素系の潤滑油に防錆剤を配合した防錆油を、１ｃｍ2 当たり０．０８〜１．６ｍｇ付着させた転がり軸受が提案されている。しかしながら、このような構成の転がり軸受は、比較的短期間の保管では優れた防錆性を示すが、長期の保管や海上輸送では、いまだ十分とは言えない。 In view of such circumstances, Patent Document 4 discloses a mineral oil system, a synthetic hydrocarbon system having a kinematic viscosity at 40 ° C. of 7 to 120 mm 2 / s on the surface constituting the bearing inner diameter and the surface constituting the bearing outer diameter. Alternatively, a rolling bearing is proposed in which 0.08 to 1.6 mg of rust preventive oil in which a rust preventive agent is blended with fluorine-based lubricating oil is attached per 1 cm 2 . However, although the rolling bearing having such a configuration exhibits excellent rust prevention properties when stored for a relatively short period of time, it is still not sufficient for long-term storage or sea transportation.

また、転がり軸受を包装する際に、気化性防錆紙を共に包装することで、防錆性を維持する試みもなされているが、コスト上昇の要因となる。
そこで、本発明は、上記のような従来技術が有する問題点を解決し、多量の防錆油を塗布しなくても十分な防錆性を有する転がり軸受を提供することを課題とする。 In addition, when packaging a rolling bearing, attempts have been made to maintain rust prevention by packaging together with vaporizable rustproof paper, but this causes an increase in cost.
Therefore, an object of the present invention is to solve the above-described problems of the prior art and to provide a rolling bearing having sufficient rust prevention properties without applying a large amount of rust prevention oil.

前記課題を解決するため、本発明は次のような構成からなる。すなわち、本発明に係る請求項１の転がり軸受は、内輪と、外輪と、前記内輪及び前記外輪の間に転動自在に配された複数の転動体と、前記内輪又は前記外輪に滑り接触又は近接する樹脂製弾性部材を有するシールと、を備える転がり軸受において、前記樹脂製弾性部材は気化性防錆剤を含有することを特徴とする。   In order to solve the above problems, the present invention has the following configuration. That is, the rolling bearing according to the first aspect of the present invention includes an inner ring, an outer ring, a plurality of rolling elements arranged in a freely rolling manner between the inner ring and the outer ring, and sliding contact with the inner ring or the outer ring. A rolling bearing comprising a seal having an adjacent resin elastic member, wherein the resin elastic member contains a vaporizable rust preventive.

本発明の転がり軸受は、気化性防錆剤を含有する樹脂製弾性部材を有するシールを備えているので、多量の防錆油を塗布しなくても十分な防錆性を有する   Since the rolling bearing of the present invention includes a seal having a resin elastic member containing a vaporizable rust preventive agent, the rolling bearing has sufficient rust resistance even without applying a large amount of rust preventive oil.

本発明に係る転がり軸受の実施の形態を、図面を参照しながら詳細に説明する。
図１は、本発明に係る転がり軸受の一実施形態である深溝玉軸受の構造を示す縦断面図である。図１の深溝玉軸受は、内輪１と、外輪２と、内輪１及び外輪２の間に転動自在に配された複数の玉３と、内輪１及び外輪２の間に複数の玉３を保持する保持器４と、外輪２の両端部の内周面に取り付けられたシール５，５と、を備えている。このシール５は内輪１及び外輪２の間に介在され、内輪１の外周面と外輪２の内周面との間の開口部分をほぼ覆っている。 Embodiments of a rolling bearing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing the structure of a deep groove ball bearing which is an embodiment of a rolling bearing according to the present invention. The deep groove ball bearing shown in FIG. 1 includes an inner ring 1, an outer ring 2, a plurality of balls 3 that are arranged to freely roll between the inner ring 1 and the outer ring 2, and a plurality of balls 3 between the inner ring 1 and the outer ring 2. A retainer 4 to be retained, and seals 5 and 5 attached to inner peripheral surfaces of both end portions of the outer ring 2 are provided. This seal 5 is interposed between the inner ring 1 and the outer ring 2 and substantially covers the opening between the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2.

また、内輪１及び外輪２の間に形成され玉３が配された空隙部内には、図示しないグリース組成物又は潤滑油が配されており、シール５により深溝玉軸受内部に密封されている。このシール５は、リング状の芯金５ａと樹脂製弾性部材５ｂとが一体成形されて構成されており、樹脂製弾性部材５ｂに形成されたリップ部５ｃが内輪１に滑り接触している。なお、シール５は、上記のような接触タイプのものに限らず、リップ部５ｃが内輪１に近接するのみで接触しない非接触タイプのものでもよい。また、保持器４は備えていなくてもよい。   In addition, a grease composition or lubricating oil (not shown) is disposed in a gap formed between the inner ring 1 and the outer ring 2 and provided with the balls 3, and is sealed inside the deep groove ball bearing by a seal 5. The seal 5 is formed by integrally forming a ring-shaped cored bar 5a and a resin elastic member 5b, and a lip portion 5c formed on the resin elastic member 5b is in sliding contact with the inner ring 1. Note that the seal 5 is not limited to the contact type as described above, but may be a non-contact type in which the lip portion 5c is not in contact with the inner ring 1 only. Further, the cage 4 may not be provided.

樹脂製弾性部材５ｂは、気化性防錆剤が配合された樹脂組成物で構成されており、保管時や輸送時に気化性防錆剤が気化して樹脂製弾性部材５ｂから蒸散する。そのため、図１の転がり軸受は、多量の防錆油を塗布しなくても十分な防錆性を有している。よって、内輪１，外輪２に図示しない樹脂製のローラー，歯車，プーリをインサート成形や圧入によって取り付ける場合や、内輪１と図示しない軸との固定及び外輪２と図示しないハウジングとの固定を接着剤で行う場合にも、防錆油の拭き取り作業が必要ない。その結果、上記取り付け作業及び固定作業の作業性が大きく向上する。
また、転がり軸受を包装する際に気化性防錆紙を共に包装する必要がないので、コストの低減や省資源化が図れる。 The resin elastic member 5b is composed of a resin composition in which a vaporizable rust preventive agent is blended, and the vaporizable rust preventive agent vaporizes during storage or transportation and evaporates from the resin elastic member 5b. Therefore, the rolling bearing of FIG. 1 has sufficient rust prevention properties without applying a large amount of rust prevention oil. Therefore, when attaching resin rollers, gears, and pulleys (not shown) to the inner ring 1 and outer ring 2 by insert molding or press-fitting, fixing the inner ring 1 to a shaft (not shown) and fixing the outer ring 2 to a housing (not shown) are adhesives. No need to wipe off rust-preventing oil even when performing the above. As a result, the workability of the mounting work and the fixing work is greatly improved.
Moreover, since it is not necessary to wrap the vaporizable rust-proof paper when packaging the rolling bearing, cost reduction and resource saving can be achieved.

以下に、樹脂製弾性部材５ｂについて詳細に説明する。
〔気化性防錆剤について〕
気化性防錆剤としては、アミン又はアンモニウムの無機酸塩，アミン又はアンモニウムの有機酸塩，複素環式アミン化合物，複素環式イミン化合物，尿素系化合物，芳香族酸塩，無機酸塩等があげられる。
アミン又はアンモニウムの無機酸塩の具体例としては、ジシクロヘキシルアンモニウムナイトライト，ジイソプロピルアンモニウムナイトライト，ニトロナフタリンアンモニウムナイトライト，リン酸三アンモニウム，リン酸水素アンモニウム，モリブデン酸アンモニウム，リン酸ジシクロヘキシルアミン塩，シクロヘキシルアミンカーバメートがあげられる。 The resin elastic member 5b will be described in detail below.
[Vaporizable rust inhibitor]
Vaporizable rust preventives include amine or ammonium inorganic acid salts, amine or ammonium organic acid salts, heterocyclic amine compounds, heterocyclic imine compounds, urea compounds, aromatic acid salts, inorganic acid salts, etc. can give.
Specific examples of amine or ammonium inorganic acid salts include dicyclohexylammonium nitrite, diisopropylammonium nitrite, nitronaphthalene ammonium nitrite, triammonium phosphate, ammonium hydrogen phosphate, ammonium molybdate, dicyclohexylamine phosphate, cyclohexyl Examples include amine carbamates.

また、アミン又はアンモニウムの有機酸塩の具体例としては、アンモニウムベンゾエート，シクロヘキシルアミンベンゾエート，モノエタノールアミンベンゾエート，ジシクロヘキシルアンモニウムベンゾエート，ジイソプロピルアンモニウムベンゾエート，フタル酸アンモニウム，ジシクロヘキシルアンモニウム・カプリレート，シクロヘキシルアミンラウレート，ジシクロヘキシルアンモニウムサリシレート，ジシクロヘキシルアンモニウムシクロヘキサンカルボキシレート，シクロヘキシルアミンシクロヘキサンカルボキシレート，ジシクロヘキシルアンモニウムアクリレート，シクロヘキシルアミンアクリレートがあげられる。   Specific examples of amine or ammonium organic acid salts include ammonium benzoate, cyclohexylamine benzoate, monoethanolamine benzoate, dicyclohexylammonium benzoate, diisopropylammonium benzoate, ammonium phthalate, dicyclohexylammonium caprylate, cyclohexylamine laurate, Examples include dicyclohexylammonium salicylate, dicyclohexylammonium cyclohexanecarboxylate, cyclohexylamine cyclohexanecarboxylate, dicyclohexylammonium acrylate, and cyclohexylamine acrylate.

さらに、複素環式アミン化合物，複素環式イミン化合物の具体例としては、ベンゾトリアゾール，メチルベンゾトリアゾール，トリルトリアゾール，２−ヘプタデジルイミダゾール，チオナリドがあげられる。
さらに、尿素系化合物の具体例としては、尿素，チオ尿素，ウロトロピン，ガルバミン酸フェニルがあげられる。
さらに、芳香族酸塩の具体例としては、安息香酸ナトリウム，安息香酸亜鉛，フタル酸ナトリウムがあげられる。
さらに、無機酸塩の具体例としては、クロム酸ナトリウム，亜硝酸ナトリウム，ヘキサメタリン酸ナトリウムがあげられる。
これらの気化性防錆剤は、単独で用いてもよいし、２種以上を適宜組み合せて用いてもよい。 Furthermore, specific examples of the heterocyclic amine compound and the heterocyclic imine compound include benzotriazole, methylbenzotriazole, tolyltriazole, 2-heptadecylimidazole, and thionalide.
Furthermore, specific examples of the urea compound include urea, thiourea, urotropine, and phenyl galbamate.
Furthermore, specific examples of the aromatic acid salt include sodium benzoate, zinc benzoate, and sodium phthalate.
Furthermore, specific examples of inorganic acid salts include sodium chromate, sodium nitrite, and sodium hexametaphosphate.
These vaporizable rust preventives may be used alone or in appropriate combination of two or more.

樹脂製弾性部材中の気化性防錆剤の含有量は、０．５質量％以上１０質量％以下とすることが好ましい。１０質量％を超えて配合すると、気化性防錆剤の揮発による樹脂製弾性部材の収縮が大きくなるため、シールの密封性が低下するおそれがある。一方、０．５質量％未満であると、防錆効果が不十分となるおそれがある。   The content of the vaporizable rust inhibitor in the resin elastic member is preferably 0.5% by mass or more and 10% by mass or less. If the blending amount exceeds 10% by mass, shrinkage of the elastic member made of resin due to volatilization of the vaporizable rust preventive agent is increased, which may reduce the sealing performance of the seal. On the other hand, if it is less than 0.5% by mass, the rust preventive effect may be insufficient.

〔樹脂製弾性部材を構成する樹脂組成物について〕
樹脂組成物のマトリックスを構成する樹脂の種類は特に限定されるものではないが、従来からシールの弾性部材の材料として用いられてきたゴム材料が好ましい。例えば、ニトリルゴム，アクリルゴム，シリコーンゴム，フッ素ゴムがあげられる。
このような樹脂には、必要に応じて、充填材，加硫剤，加硫促進剤，加硫促進助剤，老化防止剤，加工助剤，摩耗改良剤，摩擦改良剤，潤滑剤，潤滑油，補強剤，可塑剤，カップリング剤，顔料，染料，離型剤，導電性付与剤等の添加剤を配合してもよい。 [About the resin composition constituting the elastic member made of resin]
Although the kind of resin which comprises the matrix of a resin composition is not specifically limited, The rubber material conventionally used as a material of the elastic member of a seal | sticker is preferable. Examples thereof include nitrile rubber, acrylic rubber, silicone rubber, and fluoro rubber.
For such resins, fillers, vulcanizing agents, vulcanization accelerators, vulcanization accelerating aids, anti-aging agents, processing aids, wear improvers, friction improvers, lubricants, lubricants are included as necessary. You may mix | blend additives, such as oil, a reinforcing agent, a plasticizer, a coupling agent, a pigment, dye, a mold release agent, and an electroconductivity imparting agent.

また、必要に応じて補強性充填材を配合してもよい。補強性充填材としては、カーボンブラックや無機系化合物の白色系充填材等があげられる。カーボンブラックの種類は特に限定されるものではないが、ＳＡＦ（Super Abrasion Furnace black），ＩＳＡＦ（Intermediate Super Abrasion Furnace black ），ＨＡＦ（High Abrasion Furnace black ），ＭＡＦ（Medium Abrasion Furnace black ），ＦＥＦ（Fast Extruding Furnace black），ＧＰＦ（General Purpose Furnace black ），ＳＲＦ（Semi-Reinforcing Furnace black），ＦＴ（Fine Thermal Furnace black），ＭＴ（Medium Thermal Furnace black）等を例示することができる。これらの中では、補強性及び成形加工性のバランスに優れたＨＡＦ，ＭＡＦ，ＦＥＦ，ＧＰＦ，ＳＲＦがより好ましく、ＦＥＦ，ＧＰＦ，ＳＲＦがさらに好ましい。これらのカーボンブラックは１種を単独で用いてもよいし、２種以上を組み合わせて用いてもよい。   Moreover, you may mix | blend a reinforcing filler as needed. Examples of the reinforcing filler include carbon black and white fillers of inorganic compounds. The type of carbon black is not particularly limited, but SAF (Super Abrasion Furnace black), ISAF (Intermediate Super Abrasion Furnace black), HAF (High Abrasion Furnace black), MAF (Medium Abrasion Furnace black), FEF (Fast Examples include Extruding Furnace black (GPF), General Purpose Furnace black (GPF), Semi-Reinforcing Furnace black (SRF), Fine Thermal Furnace black (FT), Medium Thermal Furnace black (MT), and the like. Among these, HAF, MAF, FEF, GPF, and SRF, which are excellent in balance between reinforcement and moldability, are more preferable, and FEF, GPF, and SRF are more preferable. These carbon blacks may be used alone or in combination of two or more.

また、白色系充填材の種類は特に限定されるものではないが、各種シリカ（含水シリカ等），クレー，タルク，炭酸カルシウム，珪藻土，ウォラストナイト等があげられる。これらの白色系充填材は１種を単独で用いてもよいし、２種以上を組み合わせて用いてもよい。また、カーボンブラックと白色系充填材はそれぞれ単独で用いてもよいし、両者を併用してもよい。   The type of white filler is not particularly limited, and examples thereof include various silicas (hydrous silica etc.), clay, talc, calcium carbonate, diatomaceous earth, wollastonite and the like. One of these white fillers may be used alone, or two or more thereof may be used in combination. Carbon black and white filler may be used alone or in combination.

補強性充填材の添加量は、カーボンブラック単独の場合は、樹脂１００質量部に対し１５質量部以上１２０質量部以下とすることが好ましい。１５質量部未満であると十分な補強性が発現されず耐摩耗性が不十分となるおそれがある。一方、１２０質量部超過としても、補強性や耐摩耗性の更なる向上が認められないだけでなく、成形加工性が低下して樹脂組成物からの成形品の製造が実質的に困難となるおそれがある。また、樹脂組成物の硬さが高くなるとともに伸びが低くなり、本来有する弾性が低下してしまう。   In the case of carbon black alone, the amount of the reinforcing filler added is preferably 15 parts by mass or more and 120 parts by mass or less with respect to 100 parts by mass of the resin. If the amount is less than 15 parts by mass, sufficient reinforcing property is not exhibited and the wear resistance may be insufficient. On the other hand, when the amount exceeds 120 parts by mass, not only the improvement of the reinforcing property and the wear resistance is not recognized, but also the molding processability is lowered and the production of the molded product from the resin composition becomes substantially difficult. There is a fear. Further, the hardness of the resin composition increases and the elongation decreases, and the inherent elasticity decreases.

白色系充填材単独の場合は、樹脂１００質量部に対し２０質量部以上１８０質量部以下とすることが好ましい。２０質量部未満であると十分な補強性が発現されず、耐摩耗性が不十分となるおそれがある。一方、１８０質量部超過としても、補強性や耐摩耗性の更なる向上が認められないだけでなく、成形加工性が低下して樹脂組成物からの成形品の製造が実質的に困難となるおそれがある。また、樹脂組成物の硬さが高くなるとともに伸びが低くなり、本来有する弾性が低下してしまう。   In the case of the white filler alone, it is preferably 20 parts by mass or more and 180 parts by mass or less with respect to 100 parts by mass of the resin. If the amount is less than 20 parts by mass, sufficient reinforcing properties are not exhibited, and the wear resistance may be insufficient. On the other hand, even if the amount exceeds 180 parts by mass, not only further improvement of the reinforcing property and wear resistance is not recognized, but also the molding processability is lowered and it becomes substantially difficult to produce a molded product from the resin composition. There is a fear. Further, the hardness of the resin composition increases and the elongation decreases, and the inherent elasticity decreases.

さらに、補強性充填材としてカーボンブラックと白色系充填材とを併用する場合は、樹脂１００質量部に対し、合計で２０質量部以上２４０質量部以下とすることが好ましい。このうち、カーボンブラックは１０質量部以上９０質量部以下で、白色系充填材は１０質量部以上１５０質量部以下である。合計の添加量が２０質量部未満であると十分な補強性が発現されず、また、２４０質量部超過であると、補強性や耐摩耗性の更なる向上が認められないだけでなく、成形加工性が低下して樹脂組成物からの成形品の製造が実質的に困難となるおそれがある。また、樹脂組成物の硬さが高くなるとともに伸びが低くなり、本来有する弾性が低下してしまう。   Furthermore, when carbon black and a white filler are used in combination as the reinforcing filler, the total is preferably 20 parts by mass or more and 240 parts by mass or less with respect to 100 parts by mass of the resin. Among these, carbon black is 10 mass parts or more and 90 mass parts or less, and a white type filler is 10 mass parts or more and 150 mass parts or less. If the total addition amount is less than 20 parts by mass, sufficient reinforcement will not be exhibited, and if it exceeds 240 parts by mass, not only further improvement in reinforcement and wear resistance will be observed, but also molding. There is a possibility that the processability is lowered and it becomes substantially difficult to produce a molded product from the resin composition. Further, the hardness of the resin composition increases and the elongation decreases, and the inherent elasticity decreases.

次に、樹脂組成物の物性面について説明する。樹脂組成物の硬さは、補強性充填材や摩耗改良剤等の添加量等によって影響を受けるが、転がり軸受のシールに求められる密封性や追従性から、ＪＩＳ Ｋ６３０１に規定されたスプリング硬さＡスケールで、５０以上９０以下であることが好ましい。スプリング硬さが５０未満であると、シールの摩擦抵抗が大きくなるとともに、耐摩耗性が低下する。一方、スプリング硬さが９０超過であると、シールの反発力や緊迫力が大きくなりすぎて、転がり軸受の回転トルクが過大となるおそれがある。また、ゴム弾性が低下するので、シールの密封性，追従性が低下し、塵埃が多い環境や泥水に曝される状況等で使用すると、転がり軸受の寿命が低下するおそれがある。   Next, physical properties of the resin composition will be described. The hardness of the resin composition is affected by the addition amount of reinforcing fillers, wear improvers, etc., but the spring hardness specified in JIS K6301 is required due to the sealing properties and followability required for rolling bearing seals. It is preferably 50 or more and 90 or less on the A scale. If the spring hardness is less than 50, the frictional resistance of the seal increases and the wear resistance decreases. On the other hand, if the spring hardness is more than 90, the repulsive force and the tightening force of the seal become too large, and the rotational torque of the rolling bearing may be excessive. In addition, since the rubber elasticity is lowered, the sealing performance and followability of the seal are lowered, and if used in an environment where there is a lot of dust or exposed to muddy water, the life of the rolling bearing may be reduced.

弾性部材を構成する樹脂組成物を製造する方法は特に限定されるものではないが、樹脂，気化性防錆剤等の上記各成分を、混練ロール，加圧ニーダー，バンバリーミキサー等のような従来公知の混練装置を用いて均一に混練する方法が好ましい。混練条件は特に限定されるものではないが、通常は３０℃以上８０℃以下の温度で５分以上６０分以下混練することによって、樹脂組成物中に各種添加剤を十分に分散させることができる。   The method for producing the resin composition constituting the elastic member is not particularly limited, but the above-described components such as the resin and the vaporizable rust preventive are conventionally used as kneading rolls, pressure kneaders, Banbury mixers, and the like. A method of uniformly kneading using a known kneading apparatus is preferred. The kneading conditions are not particularly limited. Usually, various additives can be sufficiently dispersed in the resin composition by kneading at a temperature of 30 ° C. to 80 ° C. for 5 minutes to 60 minutes. .

また、樹脂組成物からシールの弾性部材を製造する方法は特に限定されるものではないが、未架橋の樹脂組成物を金型等の中で加圧しながら加熱する方法が好ましい。例えば、圧縮成形法，トランスファー成形法，射出成形法等のような従来公知の成形方法が好ましい。圧縮成形法の場合は、金型中に予め接着剤を塗布した芯金（シールの芯部を形成する部材）を配し、その上に未架橋の樹脂組成物で構成されたシートを乗せ、通常は１５０℃以上２３０℃以下で０．２分以上３０分以下、加圧しながら加熱して架橋させる。また、必要に応じて、１２０℃以上２００℃以下で１０分以上１０時間以下加熱して、後架橋してもよい。   The method for producing the elastic member of the seal from the resin composition is not particularly limited, but a method in which the uncrosslinked resin composition is heated while being pressed in a mold or the like is preferable. For example, a conventionally known molding method such as a compression molding method, a transfer molding method, an injection molding method or the like is preferable. In the case of the compression molding method, a cored bar (a member that forms the core part of the seal) previously coated with an adhesive is placed in a mold, and a sheet composed of an uncrosslinked resin composition is placed on the cored bar, Usually, crosslinking is carried out by heating at 150 ° C. or higher and 230 ° C. or lower for 0.2 to 30 minutes while applying pressure. Moreover, you may post-crosslink by heating at 120 degreeC or more and 200 degrees C or less for 10 minutes or more and 10 hours or less as needed.

なお、本実施形態は本発明の一例を示したものであって、本発明は本実施形態に限定されるものではない。例えば、本実施形態においては、転がり軸受の例として深溝玉軸受をあげて説明したが、転がり軸受の種類は深溝玉軸受に限定されるものではなく、本発明は様々な種類の転がり軸受に対して適用することができる。例えば、アンギュラ玉軸受，自動調心玉軸受，円筒ころ軸受，円すいころ軸受，針状ころ軸受，自動調心ころ軸受等のラジアル形の転がり軸受や、スラスト玉軸受，スラストころ軸受等のスラスト形の転がり軸受である。   In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, in this embodiment, a deep groove ball bearing has been described as an example of a rolling bearing. However, the type of rolling bearing is not limited to a deep groove ball bearing, and the present invention is applicable to various types of rolling bearings. Can be applied. For example, radial rolling bearings such as angular contact ball bearings, self-aligning ball bearings, cylindrical roller bearings, tapered roller bearings, needle roller bearings, and self-aligning roller bearings, and thrust types such as thrust ball bearings and thrust roller bearings This is a rolling bearing.

〔実施例〕
以下に、実施例を示して、本発明をさらに具体的に説明する。下記の各種材料（ゴム，気化性防錆剤，補強性充填材，各種添加剤等）を下記に示すような組成で配合してなるゴム組成物からゴムシートを製造した。
・中高ニトリルゴム：日本ゼオン株式会社製のＮｉｐｏｌ ＤＮ３３５０（１００質量部）
・気化性防錆剤：城北化学工業株式会社製のベンゾトリアゾール（０質量部又は３質量部（表１を参照））
・カーボンブラック（ＳＲＦ）：東海カーボン株式会社製のシーストＳ（４０質量部） ・焼成クレー：Ｅｎｇｅｌｈａｒｄ Ｍｉｎｅｒａｌｓ社製のサティントン＃５（４０質量部）
・硫黄（加硫剤）：鶴見化学工業株式会社製のＳｕｌｆａｘ ＰＭＣ（０．７５質量部） 〔Example〕
Hereinafter, the present invention will be described more specifically with reference to examples. A rubber sheet was produced from a rubber composition obtained by blending the following various materials (rubber, vaporizable rust preventive agent, reinforcing filler, various additives, etc.) with the following composition.
Medium and high nitrile rubber: Nipol DN3350 (100 parts by mass) manufactured by Nippon Zeon Co., Ltd.
・ Vaporizable rust preventive agent: Benzotriazole (0 mass part or 3 mass parts (see Table 1)) manufactured by Johoku Chemical Industry Co., Ltd.
Carbon black (SRF): Seast S (40 parts by mass) manufactured by Tokai Carbon Co., Ltd. Fired clay: Satinton # 5 (40 parts by mass) manufactured by Engelhard Minerals
・ Sulfur (vulcanizing agent): Sulfax PMC (0.75 part by mass) manufactured by Tsurumi Chemical Co., Ltd.

・テトラメチルチウラムジスルフィド（加硫促進剤）：大内新興化学工業株式会社製のノクセラーＴＴ（０．８質量部）
・テトラエチルチウラムジスルフィド（加硫促進剤）：大内新興化学工業株式会社製のノクセラーＴＥＴ（１．５質量部）
・Ｎ−シクロヘキシル−２−ベンゾチアジル・スルフェンアミド（加硫促進剤）：大内新興化学工業株式会社製のノクセラーＣＺ（１質量部）
・ステアリン酸（加硫促進助剤）：花王株式会社製のＬｕｎａｃ Ｓ−３５（１質量部）
・酸化亜鉛（加硫促進助剤）：堺化学工業株式会社製のフランス法１号（５質量部） Tetramethylthiuram disulfide (vulcanization accelerator): Noxeller TT (0.8 parts by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Tetraethylthiuram disulfide (vulcanization accelerator): Noxeller TET (1.5 parts by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
N-cyclohexyl-2-benzothiazyl sulfenamide (vulcanization accelerator): Noxeller CZ (1 part by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
・ Stearic acid (vulcanization accelerator): Lunac S-35 (1 part by mass) manufactured by Kao Corporation
・ Zinc oxide (vulcanization accelerator): French method No. 1 (5 parts by mass) manufactured by Sakai Chemical Industry Co., Ltd.

・アジピン酸系ポリエステル（可塑剤）：旭電化工業株式会社製のアデカサイザー ＰＮ−１５０（５質量部）
・４，４’−ビス（α, α−ジメチルベンジル）ジフェニルアミン（老化防止剤）：大内新興化学工業株式会社製のノクラックＣＤ（２質量部）
・２−メルカプトベンズイミダゾールの亜鉛塩（老化防止剤）：大内新興化学工業株式会社製のノクラックＭＢＺ（１質量部）
・特殊ワックス（老化防止剤）：大内新興化学工業株式会社製のサンノック（１質量部）
・γ−メルカプトプロピルトリメトキシシラン（カップリング剤）：信越シリコーン社製のＫＢＭ８０３（０．５質量部） Adipic acid-based polyester (plasticizer): Adeka Sizer PN-150 (5 parts by mass) manufactured by Asahi Denka Kogyo Co., Ltd.
・ 4,4′-bis (α, α-dimethylbenzyl) diphenylamine (anti-aging agent): Nocrack CD (2 parts by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
-Zinc salt of 2-mercaptobenzimidazole (anti-aging agent): NOCRACK MBZ (1 part by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Special wax (anti-aging agent): Sunnock (1 part by mass) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Γ-mercaptopropyltrimethoxysilane (coupling agent): KBM803 (0.5 parts by mass) manufactured by Shin-Etsu Silicone

Figure 2007177949
Figure 2007177949

以下に、ゴムシートの製造方法について説明する。気化性防錆剤及び３種の加硫促進剤以外の材料を加圧ニーダーに投入し、設定温度８０℃で混練を行った（ニーダー混練工程）。混練した材料を加圧ニーダーから取り出し、２本のロールを有する混練ロール機に投入し、さらに気化性防錆剤及び３種の加硫促進剤を投入して、設定温度５０℃で混練を行った（ロール混練工程）。そして、得られたゴム組成物を、厚さ２．２ｍｍのシート状に成形した。なお、使用した２本のロールは６インチロールであり、それぞれ、２０ｒｐｍ，３２ｒｐｍの回転速度で回転させた。   Below, the manufacturing method of a rubber sheet is demonstrated. Materials other than the vaporizable rust preventive and the three types of vulcanization accelerators were charged into a pressure kneader and kneaded at a set temperature of 80 ° C. (kneader kneading step). The kneaded material is taken out from the pressure kneader, put into a kneading roll machine having two rolls, and further a vaporizable rust inhibitor and three kinds of vulcanization accelerators are added, and kneading is performed at a set temperature of 50 ° C. (Roll kneading step). And the obtained rubber composition was shape | molded in the sheet form of thickness 2.2mm. The two rolls used were 6-inch rolls, which were rotated at a rotational speed of 20 rpm and 32 rpm, respectively.

こうして得られた未加硫のゴムシートと、洗浄した後に接着剤を塗布して焼き付けた冷延鋼板製の芯金とを、金型内に載置した。この金型は、呼び番号６３０５の単列深溝玉軸受（内径２５ｍｍ，外径６２ｍｍ，幅１７ｍｍ）に組み込まれる接触シールを製造するための金型である。圧力４０ＭＰａで加圧しつつ１８０℃で３分間加熱して、加硫成形を行ない、前記ゴム組成物で構成された弾性部材を有する接触シールを得た。   The unvulcanized rubber sheet thus obtained and a cored bar made of cold-rolled steel sheet that had been washed and then baked by applying an adhesive were placed in a mold. This mold is a mold for manufacturing a contact seal incorporated in a single row deep groove ball bearing having an identification number 6305 (inner diameter 25 mm, outer diameter 62 mm, width 17 mm). While being pressurized at a pressure of 40 MPa, it was heated at 180 ° C. for 3 minutes to perform vulcanization molding, and a contact seal having an elastic member composed of the rubber composition was obtained.

このようにして得られた接触シールを、内輪，外輪，玉が軸受鋼（ＪＩＳ Ｇ４８０５のＳＵＪ２）で構成された呼び番号６３０５の単列深溝玉軸受に組み込んだ。そして、実施例１及び比較例１の軸受については、ｎ−ヘキサンを用いて完全に脱脂洗浄した。また、実施例２及び比較例２の軸受については、４０℃における動粘度が３２ｍｍ2 ／ｓのパラフィン系鉱油に防錆剤であるカルシウムスルホネートを濃度が５質量％となるように混合した防錆油を５ｍｇ塗布した。 The contact seal thus obtained was incorporated into a single row deep groove ball bearing having a nominal number 6305 in which the inner ring, the outer ring, and the ball were made of bearing steel (SUJ2 of JIS G4805). The bearings of Example 1 and Comparative Example 1 were completely degreased and cleaned using n-hexane. Further, for the bearings of Example 2 and Comparative Example 2, rust prevention in which calcium sulfonate as a rust inhibitor is mixed with paraffin mineral oil having a kinematic viscosity at 40 ° C. of 32 mm 2 / s to a concentration of 5% by mass. 5 mg of oil was applied.

これらの軸受を、厚さ０．０７ｍｍ，幅１００ｍｍ，長さ１８０ｍｍの低密度ポリエチレン製の包装袋１０に入れ、開口部１１を３重に折り返した（図２を参照）。軸受が入った包装袋１０を、温度５０℃，相対湿度９０％ＲＨに設定した恒温恒湿槽（楠本化成株式会社製のエタックＨＩＦＬＥＸ α ＦＨ０８）内に静置した。そして、軸受の外径面に、面積率で１０％の錆が発生するまでの時間により、防錆効果を評価した。結果を表１に示す。   These bearings were placed in a low density polyethylene packaging bag 10 having a thickness of 0.07 mm, a width of 100 mm, and a length of 180 mm, and the opening 11 was folded back three times (see FIG. 2). The packaging bag 10 containing the bearing was placed in a constant temperature and humidity chamber (Etac HIFLEX α FH08 manufactured by Enomoto Kasei Co., Ltd.) set to a temperature of 50 ° C. and a relative humidity of 90% RH. And the antirust effect was evaluated by the time until 10% of rust is generated on the outer diameter surface of the bearing. The results are shown in Table 1.

表１の結果から分かるように、接触シールの弾性部材に気化性防錆剤を添加した実施例１及び実施例２は、優れた防錆効果を有していた。特に、少量の防錆油を軸受へ塗布した実施例２は、気化性防錆剤と防錆油との両方の効果により、より優れた防錆効果を有していた。これに対して、少量の防錆油を塗布しただけの比較例２は、長期間の静置により防錆油被膜にムラを生じたため、防錆効果が低下したものと思われる。   As can be seen from the results of Table 1, Example 1 and Example 2 in which a vaporizable rust inhibitor was added to the elastic member of the contact seal had an excellent rust preventive effect. In particular, Example 2 in which a small amount of rust preventive oil was applied to the bearing had a more excellent rust preventive effect due to the effects of both the vaporizable rust preventive agent and the rust preventive oil. On the other hand, in Comparative Example 2 in which only a small amount of rust-preventing oil was applied, the rust-preventing effect was thought to have deteriorated because unevenness occurred in the rust-preventing oil coating after standing for a long period of time.

次に、接触シールの弾性部材中の気化性防錆剤の含有量と防錆効果との関係を調査した。すなわち、前述の実施例１と同様の転がり軸受において気化性防錆剤の含有量を種々変更したものを用意して、前述と同様の方法により防錆効果を評価した。結果を図３のグラフに示す。このグラフから分かるように、ゴム組成物全体に対する気化性防錆剤の含有量が０．５質量％以上であると、良好な防錆効果を有していた。   Next, the relationship between the content of the vaporizable rust inhibitor in the elastic member of the contact seal and the rust prevention effect was investigated. That is, the same rolling bearing as in Example 1 described above was prepared with various contents of the vaporizable rust inhibitor, and the rust prevention effect was evaluated by the same method as described above. The results are shown in the graph of FIG. As can be seen from this graph, when the content of the vaporizable rust preventive agent relative to the entire rubber composition was 0.5% by mass or more, it had a good rust preventive effect.

さらに、弾性部材中の気化性防錆剤の含有量とシールの寸法変化との関係を調査した。その方法を以下に説明する。１８０℃に加熱した熱プレスに、厚さ２ｍｍ用のシート成形金型を装着し、そこに前述の接触シールの場合と同一の未加硫のゴムシートを載置した。そして、圧力４０ＭＰａで５分間加圧して、縦１５０ｍｍ，横１５０ｍｍ，厚さ２ｍｍの加硫ゴムシートを得た。   Furthermore, the relationship between the content of the vaporizable rust inhibitor in the elastic member and the dimensional change of the seal was investigated. The method will be described below. A 2 mm-thick sheet molding die was mounted on a hot press heated to 180 ° C., and the same unvulcanized rubber sheet as in the case of the contact seal was placed thereon. And it pressurized for 5 minutes with the pressure of 40 Mpa, and obtained the vulcanized rubber sheet of length 150mm, width 150mm, and thickness 2mm.

得られた加硫ゴムシートから幅２０ｍｍ，長さ５０ｍｍ，厚さ２ｍｍの短冊状試験片を切り出し、オーブンを用いて１２０℃で７０時間熱処理を行った。そして、処理前後の
試験片の体積を水中置換法により求め、熱処理による体積変化率を算出した。
結果を図４のグラフに示す。グラフから分かるように、気化性防錆剤の含有量が多いほど、体積変化（収縮量）が大きくなった。 A strip-shaped test piece having a width of 20 mm, a length of 50 mm, and a thickness of 2 mm was cut out from the obtained vulcanized rubber sheet and heat-treated at 120 ° C. for 70 hours using an oven. And the volume of the test piece before and behind a process was calculated | required by the underwater substitution method, and the volume change rate by heat processing was computed.
The results are shown in the graph of FIG. As can be seen from the graph, the volume change (shrinkage) increased as the content of the vaporizable rust inhibitor increased.

本発明の転がり軸受は、工作機械，一般機械，自動車用ファンモータ，エアコンディショナ用モータ，各種機械装置の冷却用ファンモータ等の各種回転機械の回転支持部分に好適に使用可能である。   The rolling bearing of the present invention can be suitably used for rotation support portions of various rotating machines such as machine tools, general machines, automobile fan motors, air conditioner motors, and cooling fan motors for various mechanical devices.

本発明に係る転がり軸受の一実施形態を示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows one Embodiment of the rolling bearing which concerns on this invention. 包装袋に入れた軸受の図である。It is a figure of the bearing put in the packaging bag. 接触シールの弾性部材中の気化性防錆剤の含有量と防錆効果との関係を示すグラフである。It is a graph which shows the relationship between content of the vaporizable rust preventive agent in the elastic member of a contact seal, and a rust prevention effect. 接触シールの弾性部材中の気化性防錆剤の含有量とシールの体積変化率との関係を示すグラフである。It is a graph which shows the relationship between content of the vaporizable rust preventive agent in the elastic member of a contact seal, and the volume change rate of a seal.

符号の説明Explanation of symbols

１ 内輪
２ 外輪
３ 玉
５ シール
５ｂ 樹脂製弾性部材 1 Inner ring 2 Outer ring 3 Ball 5 Seal 5b Resin elastic member

Claims (1)

内輪と、外輪と、前記内輪及び前記外輪の間に転動自在に配された複数の転動体と、前記内輪又は前記外輪に滑り接触又は近接する樹脂製弾性部材を有するシールと、を備える転がり軸受において、前記樹脂製弾性部材は気化性防錆剤を含有することを特徴とする転がり軸受。   Rolling provided with an inner ring, an outer ring, a plurality of rolling elements that are arranged to freely roll between the inner ring and the outer ring, and a seal having a resin elastic member that is in sliding contact with or close to the inner ring or the outer ring. The rolling bearing according to claim 1, wherein the elastic member made of resin contains a vaporizable rust inhibitor.
JP2005379062A 2005-12-28 2005-12-28 Rolling bearing Pending JP2007177949A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054338A1 (en) * 2007-10-26 2009-04-30 Ntn Corporation Rolling bearing and seal for rolling bearing
JP2009121670A (en) * 2007-10-26 2009-06-04 Ntn Corp Rolling bearing and seal member for rolling bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054338A1 (en) * 2007-10-26 2009-04-30 Ntn Corporation Rolling bearing and seal for rolling bearing
JP2009121670A (en) * 2007-10-26 2009-06-04 Ntn Corp Rolling bearing and seal member for rolling bearing
US8313243B2 (en) 2007-10-26 2012-11-20 Ntn Corporation Rolling bearing and seal for rolling bearing

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