JP3985618B2 - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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Publication number
JP3985618B2
JP3985618B2 JP2002208148A JP2002208148A JP3985618B2 JP 3985618 B2 JP3985618 B2 JP 3985618B2 JP 2002208148 A JP2002208148 A JP 2002208148A JP 2002208148 A JP2002208148 A JP 2002208148A JP 3985618 B2 JP3985618 B2 JP 3985618B2
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Japan
Prior art keywords
ring member
outer ring
fitted
cap
axial direction
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Expired - Fee Related
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JP2002208148A
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Japanese (ja)
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JP2004052831A (en
Inventor
照之 脇阪
直樹 益田
洋一 津崎
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JTEKT Corp
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JTEKT Corp
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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
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/30—Material joints
    • F16C2226/40—Material joints with adhesive
    • 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
    • F16C2326/02—Wheel hubs or castors
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles

Description

【０００１】
【発明の属する技術分野】
本発明は、転がり軸受装置に関する。
【０００２】
【従来の技術】
車軸用転がり軸受装置は、車体側に非回転に支持される外輪部材と、この外輪部材の径方向内方に軸心回りに回転自在に配置される内輪部材と、外輪部材と内輪部材との間に転動自在に配置される２列の玉とを備える。内輪部材は、ブレーキディスクおよびタイヤホイールが取付けられるハブ軸と、このハブ軸の車両インナ側に嵌着される環状部材とを備える。
【０００３】
外輪部材の内周面には、各列の玉の内輪軌道面が形成されている。ハブ軸の外周面途中部および環状部材の外周面は、玉の内輪軌道面が形成され、ハブ軸の端部にナットを螺着締結することで、各列の玉に対して所定の予圧が付与される。
【０００４】
外輪部材と内輪部材との間の空間を車両インナ側で覆う保護キャップが、外輪部材の内周面に嵌着されている。この保護キャップは、車軸用転がり軸受の内部に泥水等が浸入するのを防止する機能を有する。またこの保護キャップは、環状部材の外周面に嵌着されるパルサーリングからの出力信号を検出する回転数センサの取付け部材として利用される。
【０００５】
このような保護キャップは、外輪部材に対する嵌合いのために、外輪部材の端部内周面に、軸方向に所定の長さの嵌合部を有する。
【０００６】
【発明が解決しようとする課題】
上記車軸用転がり軸受装置において、コストの低減のために保護キャップを樹脂製とする場合がある。
【０００７】
ところで、車軸用転がり軸受装置では、その使用に伴なって外輪部材、保護キャップの温度が上昇する。そして金属製の外輪部材と樹脂製の保護キャップとでは熱膨張率（線膨張係数）が異なるため、外輪部材と保護キャップとの間に隙間が発生しやすい。このことは、泥水等が車軸用転がり軸受の内部に侵入し易くなる要因となる。
【０００８】
【課題を解決するための手段】
本発明における転がり軸受装置は、外周部に車体に固定されるフランジ部を有する金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置され軸方向一方側端部に車輪取付け用フランジ部を有する内輪部材と、前記外輪部材と内輪部材との間の環状空間に配置される複数個の転動体と、有底円筒形状に形成され、開口側端部が外輪部材の軸方向他方側端部に嵌着される樹脂製のキャップとを含み、前記外輪部材の軸方向一方側端部および前記キャップの軸方向他方側端部に、互いに径方向で対向して嵌着する円筒形状の嵌着部が軸方向に沿って設けられ、前記外輪部材の嵌着部の内周面に、前記キャップの嵌着部の樹脂製の外周面が所定の締代をもって内嵌するよう嵌着され、前記外輪部材とキャップとの嵌着状態における外輪部材の軸方向他方側端部とキャップの開口側端部とが軸方向に対向する両対向面間に、接着性を有する弾性部材が設けられている。
【０００９】
上記構成によれば、外輪部材とキャップの熱膨張率が異なっていたとしても、弾性部材が両対向面間の間隔の変位（距離の変化）に対して弾性的に追随するので、両対向面間に隙間を発生させることがなく必要なシール性を確保することができる。
【００１０】
また、前記キャップの開口側端部には、前記嵌着状態で前記外輪部材の軸方向他方側端部の軸方向端面に対向する環状のストッパ部が設けられ、前記外輪部材の軸方向他方側端部の前記軸方向端面と前記ストッパ部の軸方向端面との軸方向両対向面間に前記弾性部材が設けられている。
【００１１】
この構成においても、外輪部材の軸方向端面とキャップのストッパ部の軸方向端面との間に隙間を発生させることなく弾性部材が追随するので、外輪部材とキャップの熱膨張率が異なっていたとしても、常に必要なシール性を確保することができる。
【００１３】
【発明の実施の形態】
以下本発明の実施形態を図面に基づいて説明する。なお、図１〜図３は参考例であり、図４、図５は本発明の実施形態である。まず、参考例について説明する。図１は車軸用転がり軸受装置の全体構成を示す断面図、図２は保護キャップを外輪部材に嵌着する前の要部拡大断面図、図３は保護キャップを外輪部材に嵌着した後の要部拡大断面図である。
【００１４】
まず、図１に基づいて車軸用転がり軸受装置１の全体構成を説明する。この車軸用転がり軸受装置１は、外輪部材２と、この外輪部材２の径方向内方に軸心回りに回転自在に配置される内輪部材３と、外輪部材２と内輪部材３との間に転動自在に配置される転動体としての２列の玉４，５とを備える。
【００１５】
外輪部材２は、例えばＪＩＳ規格Ｓ５５Ｃ、あるいはＳＵＪ２に規定される材質（鋼材）によって円筒状に形成され、その外周面途中には、径方向外向きに突出する固定用フランジ６が形成されている。この固定用フランジ６を介して外輪部材２が車体側に非回転に支持される。外輪部材２の内周面には、各列の玉４，５の内輪軌道面が形成されている。
【００１６】
内輪部材３は、ハブ軸７を有する。ハブ軸７は、その車両アウタ側（軸方向一方側）位置に、径方向外向きに突出するハブフランジ９を有する。内輪部材３は、このハブ軸７の車両インナ側（軸方向他方側）に嵌着される環状部材８を備える。ハブフランジ９に、ブレーキディスク１０およびタイヤホイール１１が重ねて取付けられる。環状部材８は、ハブ軸７の車両インナ側に形成された環状凹部１２に嵌合されている。ハブ軸７の外周面途中部および環状部材８の外周面に、玉４，５の内輪軌道面が形成されている。
【００１７】
ハブ軸７は、環状部材８から車両インナ側に突出する突出部１３を有し、この突出部１３の外周面にねじが形成されている。この突出部１３にナット１４が螺着締結され、これにより、各列の玉４，５に対して所定の予圧が付与されるとともに、ハブ軸７と環状部材８とが軸心回りに回転一体となる。
【００１８】
外輪部材２の車両アウタ側端部とハブフランジ９との間に、環状空間１５をその車両アウタ側で密封するシール部材１６が設けられている。
【００１９】
環状部材８の外周面に、内輪部材３とともに軸心回りに回転するパルサーリング１７が嵌着されている。外輪部材２と内輪部材３との間の空間を車両インナ側で覆う被覆部材としての有底円筒形状で樹脂製の保護キャップ１８が、外輪部材２の内周面に嵌着されている。この保護キャップ１８は、車軸用転がり軸受装置１の内部に泥水等が浸入するのを防止して、軸受内部を保護する防水機能を有する。保護キャップ１８の形成材料として、ＰＰＳ樹脂（ポリフェニレンサルファイド）等が好適に用いられる。
【００２０】
またこの保護キャップ１８は、パルサーリング１７からの出力信号を検出する回転数センサ２１の取付け部材として利用される。保護キャップ１８は、円筒部１９と、この円筒部１９の車両インナ側を覆うよう一体的に形成される円盤部２０とから形成される。
【００２１】
保護キャップ１８は、円盤部２０に回転数センサ２１の取付け部２２を有する。保護キャップ１８は、円筒部１９の外周面途中に、径方向外向きに突出して外輪部材２の端面に当接するストッパ部２３を有する。このストッパ部２３から車両アウタ側の円筒部１９が、外輪部材２の車両インナ側端部２ａ（以下被嵌合部２ａという）に嵌合・嵌着する嵌合部２４とされる。この嵌合部２４は、外輪部材２との嵌め合いのために、軸方向に沿って所定の長さＬを有する。外輪部材２の被嵌合部２ａ内周面と、嵌合部２４の外周面とが嵌合される。
【００２２】
図２および図３に示すように、外輪部材２の被嵌合部２ａにおける端面２ｂとストッパ部２３の端面２３ａ、すなわち外輪部材２とストッパ部２３との両軸方向対向面間に、両者の熱膨張率の相違に伴なう両端面２ｂ，２３ａの軸方向間隔の変位（距離の変化）に伴なって弾性的に追随する弾性部材２５が配置されている。この弾性部材２５は、ゴム、エラストマー等の弾性材からなり、その形状は環状かつシート状で、特に軸方向の弾性に富む。
【００２３】
上記構成において、外輪部材２に対して玉４，５、内輪部材３を組付け、ナット１４をハブ軸７の端部に螺着する。そしてパルサーリング１７を環状部材８に嵌着して、次に保護キャップ１８を外輪部材２の被嵌合部２ａに内嵌する。
【００２４】
保護キャップ１８を外輪部材２の被嵌合部２ａに内嵌するに当たって、図２に示すように、予め保護キャップ１８の嵌合部２４から弾性部材２５を外嵌するようにして装着し、弾性部材２５をストッパ部２３の端面２３ａに当てて保持しておく。
【００２５】
ところで、一般に、保護キャップ１８の車両アウタ側の方が保護キャップ１８の車両インナ側に比べて、外輪部材２の被嵌合部２ａの内周面との間で面圧が小さくなる。
【００２６】
しかし上記実施形態では、外輪部材２における被嵌合部２ａの端面２ｂとストッパ部２３の端面２３ａ間に、弾性に富む弾性部材２５が配置され、両端面２ｂ，２３ａに接触ている。この弾性部材２５によって、保護キャップ１８の車両アウタ側の方が保護キャップ１８の車両インナ側に比べて、外輪部材２の被嵌合部２ａの内周面との間で面圧が小さくなっていたとしても、外輪部材２とストッパ部２３との両軸方向対向面間のシール性が、従来に比べて向上し、軸受け内部に泥水等が侵入するのを確実に防止することができる。
【００２７】
また、車軸用転がり軸受装置１の使用に伴なって、外輪部材２および保護キャップ１８の温度は上昇する。このとき外輪部材２および保護キャップ１８を形成する材料、すなわち鋼材と樹脂とでは熱膨張率が異なり、鋼材の方が樹脂よりも大きい。
【００２８】
しかし、外輪部材２における被嵌合部２ａの端面２ｂとストッパ部２３の端面２３ａ、すなわち外輪部材２とストッパ部２３との両軸方向対向面間に、外輪部材２および保護キャップ１８両者の熱膨張率の相違に伴なう両端面２ｂ，２３ａの軸方向変位に伴なって弾性的に追随する弾性部材２５が配置されている。
【００２９】
このため、外輪部材２および保護キャップ１８とが異なった熱膨張率を有していたとしても、弾性部材２５が両者に接触した状態で軸方向に膨張して、両者の間に隙間が発生するのを防止でき、シール性を確保して軸受内部に泥水等が侵入するのを防止できる。
【００３０】
本発明の実施形態を図４および図５に基づいて説明する。図４は保護キャップを外輪部材に嵌着する前の要部拡大断面図、図５は保護キャップを外輪部材に嵌着した後の要部拡大断面図である。
【００３１】
上記実施形態では、軸受内部に泥水等が侵入するのを防止するようシール性を確保するために、外輪部材２における被嵌合部２ａの端面２ｂとストッパ部２３の端面２３ａ、すなわち外輪部材２とストッパ部２３との両軸方向対向面間に、両者の熱膨張率の相違に伴なう両端面２ｂ，２３ａの軸方向変位に伴なって弾性的に追随するシート状の弾性部材２５を配置した。
【００３２】
この実施形態では、上記シート状の弾性部材に代えて、嵌合部２４の外周面２４ａおよびストッパ部２３の端面２３ａに、弾性に加えて、さらに接着性を有する樹脂からなる弾性部材３０を施している。この弾性部材３０は、室温硬化性の接着剤であり、耐オイル性に優れ、非腐食性を有する例えばシリコーン樹脂系の接着剤（商品名：ロックタイト５９１０等の接着剤）が用いられる。
【００３３】
このような接着剤を嵌合部２４の外周面２４ａおよびストッパ部２３の端面２３ａに塗布し、これが未硬化の状態で、保護キャップ１８の嵌合部２４を外輪部材２の被嵌合部２ａに内嵌し、この状態で接着剤を室温で硬化させ、外輪部材２の被嵌合部２ａと、保護キャップ１８の嵌合部２４およびストッパ部２３とを接着する。このようにすることで、接着剤はゴムのような弾性を有する弾性部材３０となる。他の構成は、上記実施形態と同様であるので同一の符号を付してその説明を省略する。
【００３４】
車軸用転がり軸受装置１の使用に伴なって、外輪部材２および保護キャップ１８の温度は上昇する。このとき外輪部材２および保護キャップ１８を形成する材料、すなわち鋼材と樹脂とでは熱膨張率が異なり、鋼材の方が樹脂よりも大きい。
【００３５】
しかし、嵌合部２４の外周面２４ａおよびストッパ部２３の端面２３ａに、弾性に加えてさらに接着性を有する樹脂からなる弾性部材３０を施しており、この弾性部材３０は、室温硬化性の接着剤を硬化させることで形成され、この弾性部材３０は、耐オイル性に優れ、非腐食性を有するものである。そしてこの弾性部材３０は、外輪部材２および保護キャップ１８両者の熱膨張率の相違に伴なう両端面の軸方向変位に伴なって弾性的に追随する。従って、外輪部材２および保護キャップ１８とが異なった熱膨張率を有していたとしても、弾性部材２５が両者に接触した状態（接着された状態）で軸方向に膨張して、両者の間に隙間が発生するのを防止でき、シール性を確保して軸受内部に泥水等が侵入するのを防止できる。
【００３６】
【発明の効果】
以上の説明から明らかな通り、本発明によれば、外輪部材とキャップの熱膨張率が異なっていたとしても、弾性部材が、外輪部材とキャップとの嵌着状態における外輪部材の端部とキャップとが対向する両対向面の変位に弾性的に追随するので、必要なシール性を確保することができる。
【図面の簡単な説明】
【図１】 参考例の実施形態を示す車軸用転がり軸受装置の全体構成を示す断面図である。
【図２】 同じく保護キャップを外輪部材に嵌着する前の要部拡大断面図である。
【図３】 同じく保護キャップを外輪部材に嵌着した後の要部拡大断面図である。
【図４】 本発明の実施形態を示す保護キャップを外輪部材に嵌着する前の要部拡大断面図である。
【図５】 同じく保護キャップを外輪部材に嵌着した後の要部拡大断面図である。
【符号の説明】
１ 車軸用転がり軸受装置
２ 外輪部材
２ｂ 外輪部材の端面
３ 内輪部材
１８ 保護キャップ
１９ 円筒部
２０ 円盤部
２３ ストッパ部
２３ａ ストッパ部の端面
２４ 嵌合部
２５ 弾性部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device.
[0002]
[Prior art]
A rolling bearing device for an axle includes an outer ring member that is supported non-rotatingly on the vehicle body side, an inner ring member that is rotatably disposed about a shaft center radially inward of the outer ring member, and an outer ring member and an inner ring member. And two rows of balls arranged so as to roll freely between them. The inner ring member includes a hub shaft to which a brake disk and a tire wheel are attached, and an annular member that is fitted to the vehicle inner side of the hub shaft.
[0003]
Inner ring raceways of balls in each row are formed on the inner circumferential surface of the outer ring member. The middle part of the outer peripheral surface of the hub shaft and the outer peripheral surface of the annular member are formed with an inner raceway surface of the ball, and a predetermined preload is applied to the balls in each row by screwing and fastening a nut to the end of the hub shaft. Is granted.
[0004]
A protective cap that covers the space between the outer ring member and the inner ring member on the vehicle inner side is fitted on the inner peripheral surface of the outer ring member. This protective cap has a function of preventing muddy water or the like from entering the inside of the axle rolling bearing. The protective cap is used as a mounting member for a rotation speed sensor that detects an output signal from a pulsar ring that is fitted to the outer peripheral surface of the annular member.
[0005]
Such a protective cap has a fitting portion having a predetermined length in the axial direction on the inner peripheral surface of the end portion of the outer ring member for fitting to the outer ring member.
[0006]
[Problems to be solved by the invention]
In the axle rolling bearing device, the protective cap may be made of resin for cost reduction.
[0007]
By the way, in the rolling bearing device for axles, the temperature of an outer ring member and a protective cap rises with the use. Since the metal outer ring member and the resin protective cap have different coefficients of thermal expansion (linear expansion coefficient), a gap is likely to occur between the outer ring member and the protective cap. This is a factor that makes it easier for muddy water and the like to enter the axle rolling bearing.
[0008]
[Means for Solving the Problems]
A rolling bearing device according to the present invention includes a metal outer ring member having a flange portion fixed to a vehicle body on an outer peripheral portion, and a wheel mounting at one end in the axial direction that is concentrically disposed radially inward of the outer ring member. An inner ring member having a flange portion, a plurality of rolling elements arranged in an annular space between the outer ring member and the inner ring member, and a bottomed cylindrical shape, the opening side end being the other axial direction of the outer ring member A cylindrical cap that includes a resin cap that is fitted to a side end, and that is fitted in a radially opposite direction to the one axial end of the outer ring member and the other axial end of the cap Are fitted along the axial direction, and the resin outer peripheral surface of the fitting portion of the cap is fitted into the inner peripheral surface of the fitting portion of the outer ring member with a predetermined tightening allowance. It is, the outer ring member in the fitted state between the outer ring member and the cap Between two facing surfaces of the opening side end portion of the other direction along the side end of the cap is axially opposite, the elastic member is provided with an adhesive.
[0009]
According to the above configuration, even when the outer ring member and the cap have different thermal expansion coefficients, the elastic member elastically follows the displacement (change in distance) between the opposing surfaces. Necessary sealing properties can be secured without generating a gap therebetween.
[0010]
An opening-side end of the cap is provided with an annular stopper portion facing the axial end surface of the other axial end of the outer ring member in the fitted state, and the other axial end of the outer ring member The elastic member is provided between both axial facing surfaces of the axial end surface of the end portion and the axial end surface of the stopper portion.
[0011]
Even in this configuration, since the elastic member follows without generating a gap between the axial end surface of the outer ring member and the axial end surface of the stopper portion of the cap, the thermal expansion coefficients of the outer ring member and the cap are different. However, it is possible to always ensure the necessary sealing performance.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 are reference examples, and FIGS. 4 and 5 are embodiments of the present invention. First, a reference example will be described. FIG. 1 is a cross-sectional view showing the overall configuration of a rolling bearing device for an axle, FIG. 2 is an enlarged cross-sectional view of a main part before the protective cap is fitted to the outer ring member, and FIG. 3 is a diagram after the protective cap is fitted to the outer ring member It is a principal part expanded sectional view.
[0014]
First, the overall configuration of the axle rolling bearing device 1 will be described with reference to FIG. This axle rolling bearing device 1 includes an outer ring member 2, an inner ring member 3 that is rotatably arranged around the axis center in the radial direction of the outer ring member 2, and an outer ring member 2 and an inner ring member 3. It has two rows of balls 4 and 5 as rolling elements that are arranged to roll freely.
[0015]
The outer ring member 2 is formed in a cylindrical shape by a material (steel material) defined in, for example, JIS standard S55C or SUJ2, and a fixing flange 6 protruding outward in the radial direction is formed in the middle of the outer peripheral surface. . The outer ring member 2 is non-rotatably supported on the vehicle body side via the fixing flange 6. On the inner peripheral surface of the outer ring member 2, inner ring raceway surfaces of the balls 4 and 5 in each row are formed.
[0016]
The inner ring member 3 has a hub shaft 7. The hub shaft 7 has a hub flange 9 projecting radially outward at a position on the vehicle outer side (one side in the axial direction). The inner ring member 3 includes an annular member 8 that is fitted to the vehicle inner side (the other side in the axial direction) of the hub shaft 7. A brake disc 10 and a tire wheel 11 are attached to the hub flange 9 in an overlapping manner. The annular member 8 is fitted in an annular recess 12 formed on the vehicle inner side of the hub shaft 7. Inner ring raceway surfaces of the balls 4 and 5 are formed in the middle portion of the outer peripheral surface of the hub shaft 7 and the outer peripheral surface of the annular member 8.
[0017]
The hub shaft 7 has a protrusion 13 that protrudes from the annular member 8 toward the vehicle inner side, and a screw is formed on the outer peripheral surface of the protrusion 13. A nut 14 is screwed and fastened to the protruding portion 13, whereby a predetermined preload is applied to the balls 4 and 5 in each row, and the hub shaft 7 and the annular member 8 are integrally rotated around the axis. It becomes.
[0018]
A seal member 16 that seals the annular space 15 on the vehicle outer side is provided between the end portion of the outer ring member 2 on the vehicle outer side and the hub flange 9.
[0019]
A pulsar ring 17 that rotates around the axis together with the inner ring member 3 is fitted to the outer peripheral surface of the annular member 8. A protective cap 18 made of resin with a bottomed cylindrical shape as a covering member that covers the space between the outer ring member 2 and the inner ring member 3 on the vehicle inner side is fitted to the inner peripheral surface of the outer ring member 2. The protective cap 18 has a waterproof function of preventing the muddy water and the like from entering the inside of the axle rolling bearing device 1 and protecting the inside of the bearing. As a material of the protective cap 18, PPS resin (polyphenylene service Rufaido) or the like is preferably used.
[0020]
The protective cap 18 is used as an attachment member for the rotation speed sensor 21 that detects an output signal from the pulsar ring 17. The protective cap 18 is formed of a cylindrical portion 19 and a disk portion 20 that is integrally formed so as to cover the vehicle inner side of the cylindrical portion 19.
[0021]
The protective cap 18 has a mounting portion 22 for the rotation speed sensor 21 in the disk portion 20. The protective cap 18 has a stopper portion 23 that protrudes radially outward in contact with the end surface of the outer ring member 2 in the middle of the outer peripheral surface of the cylindrical portion 19. The cylindrical portion 19 on the vehicle outer side from the stopper portion 23 serves as a fitting portion 24 that fits and fits on the vehicle inner side end portion 2a (hereinafter referred to as the fitted portion 2a) of the outer ring member 2. The fitting portion 24 has a predetermined length L along the axial direction for fitting with the outer ring member 2. The inner peripheral surface of the fitted portion 2 a of the outer ring member 2 and the outer peripheral surface of the fitting portion 24 are fitted.
[0022]
As shown in FIGS. 2 and 3, the end surface 2 b of the fitted portion 2 a of the outer ring member 2 and the end surface 23 a of the stopper portion 23, that is, between both the axially opposed surfaces of the outer ring member 2 and the stopper portion 23, An elastic member 25 that elastically follows the displacement (change in distance) of the axial distance between both end faces 2b, 23a accompanying the difference in thermal expansion coefficient is disposed. The elastic member 25 is made of an elastic material such as rubber or elastomer, and its shape is annular and sheet-like, and is particularly rich in axial elasticity.
[0023]
In the above configuration, the balls 4 and 5 and the inner ring member 3 are assembled to the outer ring member 2, and the nut 14 is screwed to the end of the hub shaft 7. Then, the pulsar ring 17 is fitted into the annular member 8, and then the protective cap 18 is fitted into the fitted portion 2 a of the outer ring member 2.
[0024]
When the protective cap 18 is fitted into the fitted portion 2a of the outer ring member 2, as shown in FIG. 2, the elastic member 25 is fitted from the fitting portion 24 of the protective cap 18 in advance so as to be elastic. The member 25 is held against the end surface 23 a of the stopper portion 23.
[0025]
By the way, generally, the surface pressure on the vehicle outer side of the protective cap 18 is smaller between the inner peripheral surface of the fitted portion 2a of the outer ring member 2 than the vehicle inner side of the protective cap 18.
[0026]
However, in the above embodiment, the elastic member 25 rich in elasticity is arranged between the end surface 2b of the fitted portion 2a and the end surface 23a of the stopper portion 23 in the outer ring member 2, and is in contact with both end surfaces 2b and 23a. By this elastic member 25, the surface pressure between the protective cap 18 on the vehicle outer side and the inner peripheral surface of the fitted portion 2 a of the outer ring member 2 is smaller than that on the vehicle inner side of the protective cap 18. Even so, the sealing performance between the axially opposed surfaces of the outer ring member 2 and the stopper portion 23 is improved as compared with the conventional case, and muddy water or the like can be reliably prevented from entering the bearing.
[0027]
Further, as the axle rolling bearing device 1 is used, the temperatures of the outer ring member 2 and the protective cap 18 rise. At this time, the material forming the outer ring member 2 and the protective cap 18, that is, the steel material and the resin have different coefficients of thermal expansion, and the steel material is larger than the resin.
[0028]
However, the heat of both the outer ring member 2 and the protective cap 18 between the end surface 2b of the fitted portion 2a and the end surface 23a of the stopper portion 23 in the outer ring member 2, that is, between the axially opposed surfaces of the outer ring member 2 and the stopper portion 23. An elastic member 25 that elastically follows the axial displacement of both end faces 2b and 23a accompanying the difference in expansion coefficient is disposed.
[0029]
For this reason, even if the outer ring member 2 and the protective cap 18 have different thermal expansion coefficients, the elastic member 25 expands in the axial direction in contact with both, and a gap is generated between them. Can be prevented, and sealing performance can be secured to prevent muddy water or the like from entering the bearing.
[0030]
An embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is an enlarged cross-sectional view of a main part before the protective cap is fitted to the outer ring member, and FIG. 5 is an enlarged cross-sectional view of the main part after the protective cap is fitted to the outer ring member.
[0031]
In the above embodiment, the end surface 2b of the fitted portion 2a and the end surface 23a of the stopper portion 23 of the outer ring member 2, that is, the outer ring member 2 are secured in order to ensure the sealing performance so as to prevent muddy water and the like from entering the bearing. A sheet-like elastic member 25 that elastically follows the axial displacement of both end faces 2b, 23a due to the difference in thermal expansion coefficient between the two axially opposing surfaces of the stopper portion 23 and the stopper portion 23. Arranged.
[0032]
In this embodiment, instead of the sheet-like elastic member, an elastic member 30 made of a resin having adhesiveness in addition to elasticity is applied to the outer peripheral surface 24a of the fitting portion 24 and the end surface 23a of the stopper portion 23. ing. The elastic member 30 is a room temperature curable adhesive, and is made of, for example, a silicone resin adhesive (trade name: adhesive such as Loctite 5910) having excellent oil resistance and non-corrosive properties.
[0033]
Such an adhesive is applied to the outer peripheral surface 24a of the fitting portion 24 and the end surface 23a of the stopper portion 23, and in an uncured state, the fitting portion 24 of the protective cap 18 is fitted to the fitted portion 2a of the outer ring member 2. In this state, the adhesive is cured at room temperature, and the fitted portion 2a of the outer ring member 2, the fitting portion 24 of the protective cap 18, and the stopper portion 23 are bonded. By doing in this way, an adhesive agent serves as elastic member 30 which has elasticity like rubber. Since other configurations are the same as those in the above embodiment, the same reference numerals are given and description thereof is omitted.
[0034]
As the axle rolling bearing device 1 is used, the temperatures of the outer ring member 2 and the protective cap 18 rise. At this time, the material forming the outer ring member 2 and the protective cap 18, that is, the steel material and the resin have different coefficients of thermal expansion, and the steel material is larger than the resin.
[0035]
However, an elastic member 30 made of a resin having adhesiveness in addition to elasticity is applied to the outer peripheral surface 24a of the fitting portion 24 and the end surface 23a of the stopper portion 23, and the elastic member 30 is bonded to room temperature curable. The elastic member 30 is formed by curing the agent, and is excellent in oil resistance and non-corrosive. The elastic member 30 elastically follows the axial displacement of both end faces accompanying the difference in thermal expansion coefficient between both the outer ring member 2 and the protective cap 18. Therefore, even if the outer ring member 2 and the protective cap 18 have different coefficients of thermal expansion, the elastic member 25 expands in the axial direction in a state where the elastic member 25 is in contact with the two (adhered state). It is possible to prevent a gap from being generated in the bearing, to ensure sealing performance and to prevent muddy water and the like from entering the bearing.
[0036]
【The invention's effect】
As is apparent from the above description, according to the present invention, even if the coefficients of thermal expansion of the outer ring member and the cap are different from each other, the elastic member is the end of the outer ring member and the cap in the fitted state of the outer ring member and the cap. Elastically follows the displacement of both opposing surfaces facing each other, so that necessary sealing properties can be ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an overall configuration of a rolling bearing device for an axle showing an embodiment of a reference example .
FIG. 2 is an enlarged cross-sectional view of a main part before the protective cap is similarly fitted to the outer ring member.
FIG. 3 is an enlarged cross-sectional view of a main part after the protective cap is similarly fitted to the outer ring member.
FIG. 4 is an enlarged cross-sectional view of a main part before a protective cap showing an embodiment of the present invention is fitted to an outer ring member.
FIG. 5 is an enlarged cross-sectional view of a main part after the protective cap is similarly fitted to the outer ring member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus for axles 2 Outer ring member 2b End surface of outer ring member 3 Inner ring member 18 Protection cap 19 Cylindrical part 20 Disk part 23 Stopper part 23a End face of stopper part 24 Fitting part 25 Elastic member

Claims (2)

外周部に車体に固定されるフランジ部を有する金属製の外輪部材と、前記外輪部材の径方向内方に同心に配置され軸方向一方側端部に車輪取付け用フランジ部を有する内輪部材と、前記外輪部材と内輪部材との間の環状空間に配置される複数個の転動体と、有底円筒形状に形成され、開口側端部が外輪部材の軸方向他方側端部に嵌着される樹脂製のキャップとを含み、
前記外輪部材の軸方向一方側端部および前記キャップの軸方向他方側端部に、互いに径方向で対向して嵌着する円筒形状の嵌着部が軸方向に沿って設けられ、
前記外輪部材の嵌着部の内周面に、前記キャップの嵌着部の樹脂製の外周面が所定の締代をもって内嵌するよう嵌着され、
前記外輪部材とキャップとの嵌着状態における外輪部材の軸方向他方側端部とキャップの開口側端部とが軸方向に対向する両対向面間に、接着性を有する弾性部材が設けられている、ことを特徴とする軸受装置。A metal outer ring member having a flange portion fixed to the vehicle body on the outer periphery, an inner ring member concentrically arranged radially inward of the outer ring member and having a wheel mounting flange portion at one axial end. A plurality of rolling elements disposed in an annular space between the outer ring member and the inner ring member and a bottomed cylindrical shape, and an opening side end is fitted to the other end in the axial direction of the outer ring member. Including a cap made of resin,
A cylindrical fitting portion is provided along the axial direction, and is fitted to the one end portion in the axial direction of the outer ring member and the other end portion in the axial direction of the cap so as to face each other in the radial direction.
The inner peripheral surface of the fitting portion of the outer ring member is fitted so that the resin outer peripheral surface of the fitting portion of the cap is fitted with a predetermined tightening margin,
An elastic member having adhesiveness is provided between both opposing surfaces in which the other end portion in the axial direction of the outer ring member and the end portion on the opening side of the cap in the fitted state of the outer ring member and the cap are opposed in the axial direction. A bearing device characterized by that. 請求項１記載の転がり軸受装置において、前記キャップの開口側端部には、前記嵌着状態で前記外輪部材の軸方向他方側端部の軸方向端面に対向する環状のストッパ部が設けられ、前記外輪部材の軸方向他方側端部の前記軸方向端面と前記ストッパ部の軸方向端面との軸方向両対向面間に前記弾性部材が設けられている、ことを特徴とする転がり軸受装置。In the rolling bearing device according to claim 1, an annular stopper portion that is opposed to the axial end surface of the other end portion in the axial direction of the outer ring member in the fitted state is provided at the opening end portion of the cap. The rolling bearing device according to claim 1, wherein the elastic member is provided between both axially opposed surfaces of the axial end surface of the other end portion in the axial direction of the outer ring member and the axial end surface of the stopper portion.
JP2002208148A 2002-07-17 2002-07-17 Rolling bearing device Expired - Fee Related JP3985618B2 (en)

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JP4600004B2 (en) * 2004-11-18 2010-12-15 株式会社ジェイテクト Wheel bearing device
JP2006226491A (en) * 2005-02-21 2006-08-31 Jtekt Corp Rolling bearing device and its manufacturing method
JP5561007B2 (en) * 2010-08-06 2014-07-30 日本精工株式会社 Sealing device for rolling bearing unit
CN105121878B (en) * 2013-03-27 2018-07-31 Ntn株式会社 Wheel bearing arrangement
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