JP2007127157A - Sealed rolling bearing - Google Patents

Sealed rolling bearing Download PDF

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Publication number
JP2007127157A
JP2007127157A JP2005318442A JP2005318442A JP2007127157A JP 2007127157 A JP2007127157 A JP 2007127157A JP 2005318442 A JP2005318442 A JP 2005318442A JP 2005318442 A JP2005318442 A JP 2005318442A JP 2007127157 A JP2007127157 A JP 2007127157A
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Japan
Prior art keywords
rolling bearing
sealed
bearing
film
resin
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JP2005318442A
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Japanese (ja)
Inventor
Tsukasa Toyoda
司 豊田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2005318442A priority Critical patent/JP2007127157A/en
Publication of JP2007127157A publication Critical patent/JP2007127157A/en
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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
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • 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
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/60—Thickness, e.g. thickness of coatings
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/06—Drive shafts
    • 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
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed rolling bearing which prevents the fixing of an outer race to a receiving portion of the bearing by growing no rust on the outside diameter surface of the outer race due to water and muddy water for a long time. <P>SOLUTION: The outside diameter surface of the outer race 3 is covered with a rubber film 8. The thickness of the film 8 is set to be 0.5 to 1.5 mm. As a result, the generation of rust on the outside diameter surface of the outer race 3 due to water and muddy water is prevented for a long time, and the fixing of the outer race 3 to a bracket, etc. is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内輪と外輪の間の軸受空間を接触シールで密封し、内輪回転で使用される密封型転がり軸受に関する。   The present invention relates to a sealed type rolling bearing that is used in inner ring rotation by sealing a bearing space between an inner ring and an outer ring with a contact seal.

車両の床下部位でプロペラシャフトやドライブシャフト等に連結される車両用等速ジョイントのサポート用軸受のように、水や泥水が飛散する環境で使用される転がり軸受には、これらの水や泥水が内輪と外輪の間の軸受空間へ侵入するのを防止するために、接触シールで軸受空間を密封した密封型転がり軸受が用いられている。接触シールは、ゴム等の弾性部材で形成されたリップを内輪や外輪のシール摺接面と接触させて、軸受空間を密封するものである。   Rolling bearings used in an environment where water or muddy water scatters, such as support bearings for constant velocity joints for vehicles that are connected to propeller shafts, drive shafts, etc. under the floor of the vehicle, have these water and muddy water. In order to prevent entry into the bearing space between the inner ring and the outer ring, a sealed type rolling bearing in which the bearing space is sealed with a contact seal is used. The contact seal seals the bearing space by bringing a lip formed of an elastic member such as rubber into contact with a seal sliding contact surface of an inner ring or an outer ring.

この種の密封型転がり軸受には、軸受空間の両側に１枚ずつの接触シールを装着したものや（例えば、特許文献１参照）、これらの１枚ずつ装着した接触シールの外側に、さらに非接触のシールドを装着したものがある（例えば、特許文献２参照）。また、本出願人は、軸受空間を内外２枚の接触シールで密封した密封型転がり軸受も提案している（特願２００５−２９１１６）。   This type of sealed-type rolling bearing is provided with one contact seal on each side of the bearing space (see, for example, Patent Document 1), or on the outside of the contact seals installed one by one. Some have a contact shield (see, for example, Patent Document 2). The applicant has also proposed a hermetic rolling bearing in which the bearing space is sealed with two contact seals (in Japanese Patent Application No. 2005-29116).

実開平７−１０５５５号公報Japanese Utility Model Publication No. 7-10555 実公平８−３７１０号公報No. 8-3710

上述した水や泥水が飛散する環境で使用される密封型転がり軸受で、内輪回転で使用されるものでは、ブラケット等に内嵌固定される外輪の外径面に錆が発生する。このように外輪の外径面に錆が発生すると、例えば、前記車両用等速ジョイントのサポート用軸受のように、ブラケット等から軸受を取り外す必要があるものでは、外輪が錆でブラケット等と固着し、軸受の取り外しができなくなる問題がある。   In the above-described sealed type rolling bearing used in an environment where water or muddy water scatters and used in inner ring rotation, rust is generated on the outer diameter surface of the outer ring that is fitted and fixed to a bracket or the like. When rust occurs on the outer diameter surface of the outer ring in this way, for example, in the case where the bearing needs to be removed from the bracket or the like, such as the support bearing for the constant velocity joint for the vehicle, the outer ring is fixed to the bracket or the like with rust. However, there is a problem that the bearing cannot be removed.

なお、一般的な軸受の防錆手段としては、軸受部品の表面に化成処理皮膜を形成し、この化成処理皮膜に防錆剤含浸処理や樹脂含浸処理を施す方法（特開２００２−２９４４６５号公報）や、軸受部品の表面に防錆グリースを塗布する方法（特開２００３−２３９０９０号公報）が提案されている。しかしながら、これらの方法は、初期の使用における錆の発生は防止できるが、軸受をブラケット等から着脱してメンテナンスする際に、化成処理皮膜が剥がれたり、グリース皮膜がなくなったりするので、長期間の使用に耐えることができない。   Incidentally, as a general bearing rust preventive means, a chemical conversion treatment film is formed on the surface of a bearing component, and this chemical conversion treatment film is subjected to a rust inhibitor impregnation treatment or a resin impregnation treatment (Japanese Patent Laid-Open No. 2002-294465). ) And a method of applying a rust preventive grease to the surface of a bearing component (Japanese Patent Laid-Open No. 2003-239090) has been proposed. However, these methods can prevent the occurrence of rust in the initial use, but when the bearing is removed from the bracket or the like for maintenance, the chemical conversion film may be peeled off or the grease film may be lost. Cannot withstand use.

そこで、本発明の課題は、水や泥水による外輪の外径面での錆の発生を長期間に亘ってなくし、外輪の軸受収納部への固着を防止することである。   Accordingly, an object of the present invention is to eliminate the occurrence of rust on the outer diameter surface of the outer ring due to water or muddy water for a long period of time, and to prevent the outer ring from sticking to the bearing housing portion.

上記の課題を解決するために、本発明は、内輪と外輪の間の軸受空間を接触シールで密封し、内輪回転で使用される密封型転がり軸受において、前記外輪の外径面をゴムまたは樹脂の皮膜で覆い、この皮膜の厚みを０．５〜１．５ｍｍとした構成を採用した。   In order to solve the above-described problems, the present invention provides a sealed rolling bearing used for rotating an inner ring in which a bearing space between an inner ring and an outer ring is sealed with a contact seal, and an outer diameter surface of the outer ring is made of rubber or resin. The film was covered with a film having a thickness of 0.5 to 1.5 mm.

すなわち、外輪の外径面をゴムまたは樹脂の皮膜で覆い、この皮膜の厚みを０．５〜１．５ｍｍとすることにより、水や泥水による外輪の外径面での錆の発生を長期間に亘ってなくし、外輪のブラケット等への固着を防止できるようにした。皮膜の厚みを０．５〜１．５ｍｍとしたのは、厚みが０．５ｍｍ未満では、軸受をブラケット等へ着脱する際に皮膜が破れる恐れがあり、厚みが１．５ｍｍを超えると、ブラケット等への固定が不安定になるからである。   That is, by covering the outer diameter surface of the outer ring with a rubber or resin film and setting the thickness of this film to 0.5 to 1.5 mm, the generation of rust on the outer diameter surface of the outer ring due to water or muddy water is prolonged. This prevents the outer ring from sticking to the bracket or the like. If the thickness is less than 0.5 mm, the coating may be broken when the bearing is attached to or detached from the bracket or the like. If the thickness exceeds 1.5 mm, the bracket This is because the fixation to etc. becomes unstable.

前記皮膜の硬さをデュロメータ硬さタイプＡで８０以上とすることにより、皮膜の強度を十分に確保できるとともに、軸受をより安定してブラケット等に固定することができる。   By setting the hardness of the coating to 80 or more with durometer hardness type A, the strength of the coating can be sufficiently secured, and the bearing can be more stably fixed to a bracket or the like.

前記皮膜は、ニトリルゴム、アクリルゴム、フッ素ゴム、エチレンプロピレンジエンターポリマのいずれかのゴム、またはポリアミド樹脂、ポリフェニレンスルフィド樹脂、ポリフタルアミド樹脂、ポリエーテルエーテルケトン樹脂のいずれかの樹脂で形成することができる。   The film is formed of any one of nitrile rubber, acrylic rubber, fluoro rubber, ethylene propylene diene polymer, or polyamide resin, polyphenylene sulfide resin, polyphthalamide resin, polyether ether ketone resin. be able to.

上述した各密封型転がり軸受は、車両用等速ジョイントのサポート用軸受に好適である。   Each of the above-described sealed rolling bearings is suitable as a support bearing for a constant velocity joint for a vehicle.

本発明の密封型転がり軸受は、外輪の外径面をゴムまたは樹脂の皮膜で覆い、この皮膜の厚みを０．５〜１．５ｍｍとしたので、水や泥水による外輪の外径面での錆の発生を長期間に亘ってなくし、外輪のブラケット等への固着を防止することができる。   In the sealed type rolling bearing of the present invention, the outer diameter surface of the outer ring is covered with a rubber or resin film, and the thickness of this film is set to 0.5 to 1.5 mm. The generation of rust can be eliminated over a long period of time, and adhesion of the outer ring to the bracket or the like can be prevented.

前記皮膜の硬さをデュロメータ硬さタイプＡで８０以上とすることにより、皮膜の強度を十分に確保できるとともに、軸受をより安定してブラケット等に固定することができる。   By setting the hardness of the coating to 80 or more with durometer hardness type A, the strength of the coating can be sufficiently secured, and the bearing can be more stably fixed to a bracket or the like.

以下、図面に基づき、本発明の実施形態を説明する。この密封型転がり軸受は、図１に示すように、内輪２と外輪３の間でボール４が保持器５に保持された軸受空間の両側を、内側の接触シール６と外側のシールド７で密封した玉軸受１であり、外輪３の外径面がニトリルゴムの皮膜８で覆われている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this sealed rolling bearing seals both sides of the bearing space where the balls 4 are held by the cage 5 between the inner ring 2 and the outer ring 3 with an inner contact seal 6 and an outer shield 7. The outer diameter surface of the outer ring 3 is covered with a nitrile rubber film 8.

前記接触シール６は芯金部６ａとゴム部６ｂとから成り、外輪３の内径面に固定されて、ゴム部６ｂに設けられた内外２枚のリップ６ｃが内輪２の外径面に摺接するようになっている。また、金属板で形成されたシールド７は内輪２の外径面に固定されている。   The contact seal 6 includes a cored bar portion 6a and a rubber portion 6b. The contact seal 6 is fixed to the inner diameter surface of the outer ring 3, and two inner and outer lips 6c provided on the rubber portion 6b are in sliding contact with the outer diameter surface of the inner ring 2. It is like that. The shield 7 made of a metal plate is fixed to the outer diameter surface of the inner ring 2.

前記皮膜８は、外輪３の外径面と対向させた金型との間に液状のニトリルゴムを流し込むことにより成形されたものであり、その厚みが０．５〜１．５ｍｍ、硬さがデュロメータ硬さタイプＡで８０以上とされている。なお、皮膜８を樹脂で形成する場合は、外輪３の外径面と対向させた金型との間に樹脂を射出成形するとよい。   The coating 8 is formed by pouring a liquid nitrile rubber between a mold facing the outer diameter surface of the outer ring 3 and has a thickness of 0.5 to 1.5 mm and a hardness of The durometer hardness type A is 80 or more. When the coating 8 is formed of resin, the resin may be injection-molded between the outer diameter surface of the outer ring 3 and a mold facing the outer ring 3.

図２は、上述した玉軸受１を車両用等速ジョイントのサポート用軸受として使用した状態を示す。この玉軸受１は、外輪３が車両の床下部位に固定されるブラケット１１に内嵌され、トランスミッションと等速ジョイント（図示省略）を連結する中間軸１２を支持して、等速ジョイントをサポートするようになっている。等速ジョイントには車輪が連結される。この外輪３の外径面はゴムの皮膜８で覆われているので、水や泥水が飛散しても長期間錆が発生することはなく、外輪３がブラケット１１に固着することはない。   FIG. 2 shows a state in which the above-described ball bearing 1 is used as a support bearing for a constant velocity joint for a vehicle. The ball bearing 1 is fitted in a bracket 11 whose outer ring 3 is fixed to an underfloor part of a vehicle, and supports an intermediate shaft 12 that connects a transmission and a constant velocity joint (not shown) to support the constant velocity joint. It is like that. Wheels are connected to the constant velocity joint. Since the outer diameter surface of the outer ring 3 is covered with the rubber film 8, rust does not occur for a long time even when water or muddy water scatters, and the outer ring 3 does not adhere to the bracket 11.

上述した実施形態では、外輪の外径面の皮膜をニトリルゴムで形成したが、この皮膜は、アクリルゴム、フッ素ゴム、エチレンプロピレンジエンターポリマ等の他のゴムや、ポリアミド樹脂、ポリフェニレンスルフィド樹脂、ポリフタルアミド樹脂、ポリエーテルエーテルケトン樹脂等の樹脂で形成することもできる。これらのゴムや樹脂にグラスファイバやカーボンファイバ等の添加剤を添加することもできる。   In the embodiment described above, the outer diameter surface film of the outer ring is formed of nitrile rubber, but this film is made of other rubber such as acrylic rubber, fluorine rubber, ethylene propylene diene terpolymer, polyamide resin, polyphenylene sulfide resin, It can also be formed of a resin such as a polyphthalamide resin or a polyether ether ketone resin. Additives such as glass fiber and carbon fiber can be added to these rubbers and resins.

また、上述した実施形態では、密封型転がり軸受を玉軸受とし、その軸受空間を接触シールとシールドで密封したが、本発明に係る密封型転がり軸受は、ころ軸受等の他の種類の転がり軸受にも適用することができ、軸受空間の密封形式も実施形態のものに限定されることはない。   In the above-described embodiment, the sealed rolling bearing is a ball bearing and the bearing space is sealed with a contact seal and a shield. However, the sealed rolling bearing according to the present invention is another type of rolling bearing such as a roller bearing. The sealing type of the bearing space is not limited to that of the embodiment.

密封型転がり軸受の実施形態を示す縦断面図Longitudinal sectional view showing an embodiment of a sealed rolling bearing 図１の密封型転がり軸受を車両用等速ジョイントのサポート用軸受として使用した状態を示す要部縦断面図FIG. 1 is a longitudinal sectional view of an essential part showing a state in which the sealed type rolling bearing of FIG.

符号の説明Explanation of symbols

１ 玉軸受
２ 内輪
３ 外輪
４ ボール
５ 保持器
６ 接触シール
６ａ 芯金部
６ｂ ゴム部
６ｃ リップ
７ シールド
８ 皮膜
１１ ブラケット
１２ 中間軸 DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Inner ring 3 Outer ring 4 Ball 5 Cage 6 Contact seal 6a Metal core part 6b Rubber part 6c Lip 7 Shield 8 Film 11 Bracket 12 Intermediate shaft

Claims (4)

内輪と外輪の間の軸受空間を接触シールで密封し、内輪回転で使用される密封型転がり軸受において、前記外輪の外径面をゴムまたは樹脂の皮膜で覆い、この皮膜の厚みを０．５〜１．５ｍｍとしたことを特徴とする密封型転がり軸受。   The bearing space between the inner ring and the outer ring is sealed with a contact seal. In a sealed type rolling bearing used for inner ring rotation, the outer diameter surface of the outer ring is covered with a rubber or resin film, and the thickness of this film is 0.5. Sealed type rolling bearing characterized by a thickness of ˜1.5 mm. 前記皮膜の硬さをデュロメータ硬さタイプＡで８０以上とした請求項１に記載の密封型転がり軸受。   The hermetic rolling bearing according to claim 1, wherein the hardness of the coating is 80 or more in durometer hardness type A. 前記皮膜を、ニトリルゴム、アクリルゴム、フッ素ゴム、エチレンプロピレンジエンターポリマのいずれかのゴム、またはポリアミド樹脂、ポリフェニレンスルフィド樹脂、ポリフタルアミド樹脂、ポリエーテルエーテルケトン樹脂のいずれかの樹脂で形成した請求項１または２に記載の密封型転がり軸受。   The film is formed of any one of nitrile rubber, acrylic rubber, fluoro rubber, ethylene propylene diene polymer, or polyamide resin, polyphenylene sulfide resin, polyphthalamide resin, or polyether ether ketone resin. The sealed rolling bearing according to claim 1 or 2. 前記密封型転がり軸受が、車両用等速ジョイントのサポート用軸受である請求項１乃至３のいずれかに記載の密封型転がり軸受。   The sealed rolling bearing according to any one of claims 1 to 3, wherein the sealed rolling bearing is a support bearing for a constant velocity joint for a vehicle.
JP2005318442A 2005-11-01 2005-11-01 Sealed rolling bearing Pending JP2007127157A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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WO2009155938A1 (en) * 2008-06-23 2009-12-30 Ab Skf A bearing component
WO2011060041A2 (en) * 2009-11-13 2011-05-19 Entemerson Power Transmission Corporation External bearing shroud
JP2013160280A (en) * 2012-02-03 2013-08-19 Ntn Corp Sealed rolling bearing
US20220355615A1 (en) * 2021-05-07 2022-11-10 Aktiebolaget Skf Secondary sealing device for wheel bearing assemblies

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8333515B2 (en) 2006-06-30 2012-12-18 Emerson Power Transmission Corporation External bearing shroud
WO2009155938A1 (en) * 2008-06-23 2009-12-30 Ab Skf A bearing component
WO2011060041A2 (en) * 2009-11-13 2011-05-19 Entemerson Power Transmission Corporation External bearing shroud
WO2011060041A3 (en) * 2009-11-13 2011-09-29 Entemerson Power Transmission Corporation External bearing shroud
JP2013160280A (en) * 2012-02-03 2013-08-19 Ntn Corp Sealed rolling bearing
US20220355615A1 (en) * 2021-05-07 2022-11-10 Aktiebolaget Skf Secondary sealing device for wheel bearing assemblies
US11668348B2 (en) * 2021-05-07 2023-06-06 Aktiebolaget Skf Secondary sealing device for wheel bearing assemblies

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