JP4240197B2

JP4240197B2 - SEALING DEVICE FOR ROLLING BEARING AND ROLLING BEARING DEVICE

Info

Publication number: JP4240197B2
Application number: JP2002212206A
Authority: JP
Inventors: 和也藤本; 雅英砂川
Original assignee: JTEKT Corp; Koyo Sealing Techno Co Ltd
Current assignee: JTEKT Corp; Koyo Sealing Techno Co Ltd
Priority date: 2002-07-22
Filing date: 2002-07-22
Publication date: 2009-03-18
Anticipated expiration: 2022-07-22
Also published as: JP2004052924A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば圧延機に設けられるロールのロールネック部等を回転自在に支持するための転がり軸受用密封装置および転がり軸受装置に関する。
【０００２】
【従来の技術】
一般に、圧延機に付設されるロールネック用転がり軸受装置は、多列の円すいころ軸受を有する。これら多列の円すいころ軸受内には、組立て時にグリースが封入され、ロールネック用軸受装置の両端部には、グリースが外部に漏れるのを防止するシール部材を配置している。
【０００３】
ところで一般に、圧延機は、作業工程上加減速パターン運転が行われる。そして、圧延機の加減速パターン運転や、ロールネック用軸受装置の内外での温度差の発生により、ロールネック用軸受装置の内部が負圧になり、これに伴なって冷却水がロールネック用軸受装置の内部に侵入することがある。
【０００４】
そこで、ロールネック用軸受装置の内外の圧力差に対応するために、シール部材に通気孔を設け、この通気孔部分にロールネック用軸受装置の内外の圧力差に応じて開閉するベント穴や弁部材を設けている。
【０００５】
【発明が解決しようとする課題】
上記ロールネック用軸受装置では、密封装置（シール部材）に付設される弁部材を通気孔部分に取付ける作業が必要であった。さらにロールネック用軸受装置の内外の圧力差に応じて開閉するだけの弁部材では、ロールネック用軸受装置の内部に空気が流入するのといっしょに冷却水が侵入することがあり、この場合、ロールネック用軸受装置の寿命低下が懸念される。
【０００６】
【課題を解決するための手段】
本発明の請求項１に係る転がり軸受用密封装置は、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る内輪部材と、前記外輪部材および内輪部材の間に転動自在に配置される転動体とを含む転がり軸受における前記外輪部材と内輪部材との間の環状空間を密封して、前記環状空間内の潤滑剤が前記転がり軸受の外部に漏れるのを防止するためのシール部材を含む転がり軸受用密封構造であって、前記シール部材は、芯金と前記芯金に一体形成される弾性シール体とを含み、前記シール部材の前記芯金における径方向途中部位に円形の孔が形成され、前記円形の孔の周面に巻込むように延長された弾性シール体の周壁に、前記転がり軸受の内部と外部との圧力調整をするための弁体を有する弁機構が嵌着され、前記弁機構の外周部に、前記外周部より径方向の外方の側に突出した複数個の環状の係止片が形成されるとともに、前記弁機構の外周部の軸方向の一方の側には前記外周部より大径のフランジ部が形成され、前記弁機構の第一の係止片と前記フランジ部とは前記弾性シール体の軸方向の両側で外周部の径方向において前記弾性シール体と重なるよう形成され、前記弁機構の第二の係止片は前記芯金に軸方向に重なるよう形成されかつ上記弾性シール体に埋まるように係合する。
【０００７】
上記構成の転がり軸受用密封装置において、シール部材の前記芯金における径方向途中部位に円形の孔が形成され、前記円形の孔の周面に巻込むように延長された弾性シール部材の周壁に、前記転がり軸受の内部と外部との圧力調整をするための弁体を有する弁機構が嵌着されると、弾性シール体の周壁に係止片が係合して、弁機構がシール部材に対して強固に固定される。
【０００８】
本発明の請求項２に係る転がり軸受用密封装置は、請求項１に記載の転がり軸受用密封装置であって、前記弁機構の外周部と、前記第一の係止片および前記第二の係止片と、前記フランジ部とは合成樹脂または金属により一体に形成されている。
本発明の請求項３に係る転がり軸受用密封装置は、請求項１または２に記載の転がり軸受用密封装置であって、前記第一の係止片および前記第二の係止片の軸方向に前記フランジ部とは反対側の面が、軸方向に前記フランジ部に向かって拡径する傾斜した面である。
本発明の請求項４に係る転がり軸受用密封装置は、請求項１ないし３のいずれか一つに記載の転がり軸受用密封装置であって、前記弁体として、空気を通過可能で水分および油分を遮断可能な材質が用いられたものである。この場合、転がり軸受内部と外部とで圧力差が発生した場合であっても、水分が転がり軸受内部に侵入するのを防止するので、転がり軸受の所定の寿命を確保することができる。
本発明の請求項５に係る転がり軸受装置は、前記内輪部材と、前記外輪部材と、前記転動体と、請求項１ないし４のいずれかに記載の転がり軸受用密封装置と、を備え、前記転がり軸受用密封装置は、前記内輪部材と、前記外輪部材との間の環状空間を外部空間から密封する。
本発明の請求項６に係る転がり軸受装置は、前記内輪部材と、前記外輪部材と、前記転動体と、請求項１ないし４のいずれかに記載の転がり軸受用密封装置と、を備え、前記転動体は４列に配置される円錐ころであり、前記内輪部材における前記円錐ころと接触する内輪軌道面は軸方向の一方側から軸方向の他方側へ順に、拡径する第一の内輪軌道面と、縮径する第二の軌道面と、拡径する第三の軌道面と、縮径する第四の軌道面と、を有し、前記転がり軸受用密封装置は、前記内輪部材と、前記外輪部材との間の環状空間を外部空間から密封する。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態に係る転がり軸受用密封装置を、ロールネック用転がり軸受装置に用いる密封装置を例に、図面を参照して説明する。図１は密封装置を含むロールネック用転がり軸受装置の全体構成を示す断面図、図２は図１における第一密封装置部分の拡大断面図、図３は図２における第一密封装置をさらに拡大した断面図、図４は図３における一部省略側面図、図５は図１における第二密封装置の拡大断面図、図６は図５における第二密封装置をさらに拡大した断面図である。
【００１４】
図において、１は圧延機のロールを示し、２はそのロールネックを示す。本発明の転がり軸受装置Ｂは、ハウジング３に非回転に内嵌されるとともに、軸心方向に並べられた外輪部材４，５，６を有する。これら外輪部材４，５，６は、軸心方向両側に配置された端部側の単列軌道を有する外輪部材４，６と、これら両外輪部材４，６の間に配置される複列軌道を有する外輪部材５とから構成される。転がり軸受装置Ｂは、各外輪部材４，５，６の径方向内方に軸心回りに回転自在に配置される軸心方向に一対の複列の内輪部材７，８を有する。図１の符号２ａは、内輪部材７，８とロールネック２との間に潤滑剤を供給するための油溝を示す。
【００１５】
外輪部材４，５，６と内輪部材７，８との間には、転動体としての４列の円すいころ９，１０，１１，１２が、外輪部材４，５，６の軌道面、内輪部材７，８の軌道面間に転動自在に配置されている。
【００１６】
一方側２列の円すいころ９，１０は、一方の内輪部材７を共通にして、それぞれこの一方の内輪部材７と一方の外輪部材４との間と、中央の外輪部材５の一方側との間に配置され、他方側２列の円すいころ１１，１２は、他方の内輪部材８を共通にして、それぞれこの他方の内輪部材８と他方の外輪部材６との間と、中央の外輪部材５の他方側との間に配置されている。各列の円すいころ９，１０，１１，１２は、それぞれ保持器１３によって円周方向等配位置に配置されている。
【００１７】
前記両側の外輪部材４，６と、中央の外輪部材５とは、軸心方向に所定長さを有する間座（符号省略）を介して配置され、この間座に、転がり軸受装置Ｂに対して潤滑剤を供給するための給脂管１４が取付けられている。
【００１８】
さらに転がり軸受装置Ｂは、外輪部材４，５，６と内輪部材７，８との間の環状空間１５の両側にそれぞれ配置される第一密封装置１８，１８を有する。
【００１９】
図２に示すように、各第一密封装置１８は、環状空間１５内の潤滑剤が外部に漏れるのを防止するためのシール部材１９と、このシール部材１９の径方向途中位置に配置された開口２０に取付けられて、軸受内部と外部との圧力調整をするための弁体２１を備えた弁機構２２とを有する。このような第一密封装置１８，１８は、外輪部材４，６の両側の端部にそれぞれ配置される径方向外側ホルダー２３，２３と、ホルダー２３，２３に対して系方向内側に配置された内輪部材７，８との間の空間に配置されている。
【００２０】
なお、他方側の第一密封装置１８は、一方側の第一密封装置１８と同様の構成で左右対称の構成となるため、図２では一方側の第一密封装置１８のみを表している。図２において、符号３１は、ホルダー２３の外周に形成された凹部２３ａに嵌着してハウジング３とホルダー２３との間をシールするためのＯリングを示す。
【００２１】
シール部材１９は、芯金２４と、この芯金２４に一体形成される弾性シール体２５と、内輪部材８の外周面に接触して弾性シール体２５に一体形成されているリップ部２９と、このリップ部２９を内輪部材８の外周面に向けて押圧するためのコイルばね３０とから構成される。
【００２２】
芯金２４は、ホルダー２３の内周面に組込まれるの環状の支持部２６と、この支持部２６の径方向内方部位で、軸心方向外側に膨出する環状の膨出部２７とから構成される。
【００２３】
弾性シール体２５は、芯金２４に一体的に形成され、芯金２４の膨出部２７の径方向外方部位に固着されるとともにホルダー２３の内周面に嵌合する環状の固定部２８に固着される。
【００２４】
図３に示すように、前記芯金２４の膨出部２７における側壁の円周方向所定箇所に側面視円形の孔２０ａが形成され、この孔２０ａの周面に巻込むように折曲形成された弾性シール体２５の巻込み部３２が形成され、この巻込み部３２を周壁とする開口２０が形成されている。
【００２５】
この開口２０に、転がり軸受内部と外部との圧力調整をするための前記弁体２１を有する合成樹脂または金属製の前記弁機構２２が嵌合されている。この弁機構２２は、円盤状の本体３３と、この本体３３の軸心方向外側に一体的に形成されて本体３３よりも大径のフランジ３４とを有する。
【００２６】
弁機構２２の中心部には、転がり軸受内部と外部とを通気するための通気孔３５が形成されている。本体３３の外周部先端位置および外周部途中位置には、開口２０周面に本体３３を嵌合させた際に、開口２０の軸方向内方端面および巻込み部３２の周面途中位置と係合する環状の係止凸片３６ａ，３６ｂが形成されている。
【００２７】
弁機構２２の本体３３には、通気孔３５より大径の座面３７が形成され、この座面３７に転がり軸受内部と外部との圧力調整をするための前記弁体２１が着座されている。この弁体２１は、空気が通過可能で、水分、油分を遮断可能な材質で膜状に形成される。この弁体２１は気体透過性、接着性、強靭性、耐候性などに優れる材質であり、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）材に特殊加工を施したゴアテックス（商品名）などが用いられる。この弁体２１は、本体３３の側面部を縮径して保持片３８を形成することにより、環状の抑え部材３９を介して本体３３に保持されている。
【００２８】
転がり軸受装置Ｂは、図５に示すように、内輪部材７，８間の当接面どうし部分の外周凹部４０に嵌合する第二密封装置４５を有する。この第二密封装置４５は、シール部材４６と、転がり軸受内部と外部との圧力調整をするための弁体４７を有する弁機構４８とから構成される。
【００２９】
シール部材４６は、断面Ｌ字形の環状の芯金４９と、内輪部材７，８との間の外周凹部４０底面に接触するラジアルリップ５０を有して芯金４９に一体的に設けられる環状の弾性シール体５１とから構成される。このシール部材４６には、その略中心位置に開口５２が形成されている。図６に示すように、芯金４９の中心位置に開口５２と連通する凹部５３が形成されている。
【００３０】
弁機構４８は、シール部材４６の周方向所定位置に配置される。この弁機構４８は、凹部５３の底面に装着されるフランジ部５４と、このフランジ部５４よりも小径の胴部５５とを有する。胴部５５は、芯金４９から弾性シールに亙るように、開口５２に挿通されている。
【００３１】
フランジ部５４に転がり軸受内部と外部との圧力調整をするための弁体４７が着座する座面５４ａが形成され、この弁体４７は、空気を通過可能で、水分、油分を遮断可能な材質が用いられる。これは、例えば上記と同様に、シート状に形成したゴアテックス（商品名）などであり、膜状に形状されている。
【００３２】
この弁体４７は、フランジ部５４の径方向外側面部を縮径して保持片５６を形成することにより、環状の抑え部材５７を介してフランジ部５４に保持されている。胴部５５の外周面には数条の溝５８が形成され、これらの溝５８に接着剤が充填されている。
【００３３】
上記構成の転がり軸受装置Ｂにおいて、第一密封装置１８における弁機構２２は、弁体２１を本体３３の座面３７に当て、弁体２１に抑え部材３９を重ねた状態で、本体３３の側面部相当部分を縮径して保持片３８を形成することにより、弁体２１を抑え部材３９を介して本体３３に保持する。
【００３４】
第一密封装置１８は、上記のようにして組立てた弁機構２２を、シール部材１９に対して組付けることで製作する。すなわち、芯金２４の膨出部２７における開口２０（巻込み部３２）に弁機構２２の本体３３を挿入するようにし、フランジ３４を弾性シール体２５の固定部２８に当接するまで押込む。
【００３５】
このようにすると、本体３３の途中位置にある係止凸片３６ｂが開口２０の途中に、巻込み部３２の弾性に抗して埋まるように係合し、本体３３の先端位置にある断面三角形の係止凸片３６ａが巻込み部３２の端面に係止する。
【００３６】
このように、第一密封装置１８は、弁機構２２をシール部材１９に挿入するという簡単な作業でもって弁機構２２が容易に抜けないようにシール部材１９装着することができる。さらに、弁機構２２の本体３３に形成した各係止凸片３６ａ，３６ｂがシール部材１９に係止して強固に取付けられるので、第一密封装置１８を厳しい条件下で使用したとしても、弁機構２２がシール部材１９から離脱したり、開口２０との間に隙間が発生したりするのを防止できる。
【００３７】
加えて、弁機構２２は転がり軸受内部と外部との圧力調整をするための弁体２１を備えているので、圧延機が作業工程上、加減速パターン運転を行い、転がり軸受の内外で温度差が発生した場合、この弁体２１を空気が通過し、転がり軸受の内外で圧力差が発生するのを防止できる。そして弁体２１は、空気を通過させ得るとともに、水分、油分は遮断するため、転がり軸受外部から冷却水が侵入するのを防止するとともに、転がり軸受内部の潤滑剤の侵出を防止し、これにより転がり軸受の寿命を延長し得る。
【００３８】
また、第二密封装置４５は、シール部材４６の開口５２に、胴部５５から弁機構４８を挿入し、そのフランジ部５４を凹部５３の底面に当てることにより組付ける。また、弁機構４８の胴部５５外周面に接着剤を塗布して溝５８に接着剤を充填させたり、凹部５３の径をフランジ部５４の径よりも大きく形成しておき、その隙間に、さらに接着剤を充填する。このようにすることにより第二密封装置４５におけるシール部材４６と弁機構４８とをさらに強固に固着することができる。
【００３９】
この第二密封装置４５も第一密封装置１８と同様に、弁機構４８をシール部材４６に挿入するといった簡単な作業でもって製作することができる。
【００４０】
そして、この第二密封装置４５においても第一密封装置１８の場合と同様に、転がり軸受の内外で、弁体４７を介して空気の遣り取りのみ行われるので、転がり軸受外部から冷却水が侵入するのを防止するとともに、転がり軸受内部の潤滑剤の侵出を防止する。
【００４１】
図７は、第一密封装置５９の他の実施形態を示す断面図である。なお、図２に示す実施形態とは、第一密封装置５９を除いて同様の形態であるので、図２と同一の符号を付してその説明を省略する。
【００４２】
図７に示した第一密封装置５９は、環状空間１５内の潤滑剤が外部に漏れるのを防止するための環状のシール部材６０と、このシール部材６０の径方向途中位置に形成された開口６１に取付けられて、軸受内部と外部との圧力調整をするための弁体６２を有する弁機構６３とを有する。
【００４３】
シール部材６０は、断面Ｌ字形の芯金６４と、この芯金６４に一体形成される弾性シール体６５とから構成される。
【００４４】
弾性シール体６５は、芯金６４に固着される固定部６６と、この固定部６６の径方向内方に一体的に形成されて内輪部材８の外周面に接触するリップ部６７と、このリップ部６７を内輪部材８の外周面に押圧するためのコイルばね６８とから構成される。このような第一密封装置５９は、両側の外輪部材４，６の端部にそれぞれに隣合うように配置されるホルダー２３に取付けられる。
【００４５】
前記芯金６４の側壁途中部分の円周方向所定箇所に孔７１が形成され、固定部６６の一部には、孔７１の周面に巻込むように折曲した巻込み部７２を形成して、これにより開口６１が形成されている。
【００４６】
この開口６１に、転がり軸受内部と外部との圧力調整をするための前記弁体６２を備えた金属製の弁機構６３が嵌合されている。この弁機構６３は筒状の本体７３と、この本体７３の軸心方向内側に一体的に形成されて本体７３よりも大径のフランジ７４とから構成されている。
【００４７】
弁機構６３の中心部には、転がり軸受内部と外部とを通気するための通気孔７５が形成されている。この通気孔７５の軸心方向外側を被覆するように、本体７３の途中まで前記弁体６２が設けられている。この弁体６２は、上記各実施形態と同様の材質で形成されている。
【００４８】
上記構成において、第一密封装置５９における弁機構６３は、弁体６２を弁機構６３における本体７３の通気孔７５を覆うようにして本体７３の途中まで被せて固定し、芯金６４の開口６１に弁機構６３の本体７３を、フランジ７４が弾性シール体６５に当接するまで挿入するようにして組付ける。
【００４９】
弁体６２とフランジ７４の間に接着剤７６を塗布することによって弁機構６３が開口６１にさらに強固に接着固定される。
【００５０】
このように、第一密封装置５９は、弁機構６３を開口６１に装着するといった簡単な作業でもって組立てることができる。また、転がり軸受の内外で温度差が発生した場合、弁体６２を空気が通過し、転がり軸受の内外で圧力差が発生するのを防止する。そして弁体６２は、空気を通過させ得るとともに、水分、油分は遮断するため、転がり軸受外部から冷却水が侵入するのを防止するとともに、転がり軸受内部の潤滑剤の侵出を防止し、これにより転がり軸受の寿命を延長し得る。
【００５１】
上記実施形態では、弁体２１，４７，６２としてポリテトラフルオロエチレン材に特殊加工を施したゴアテックス（商品名）を用いたが、これに限定されない。例えば、ポリテトラフルオロエチレン材に延伸加工を施して形成したポリテトラフルオロエチレンシートと、毛、繊維を圧縮して形成した不織布とを貼合わせたものを用いてもよい。この場合も空気を透過可能で水分は遮断するので、上記各実施形態と同様に、転がり軸受外部から冷却水が侵入するのを防止するとともに、転がり軸受内部の潤滑剤の侵出を防止し、これにより転がり軸受の寿命を延長し得る。
【００５２】
【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、密封装置は、シール部材の前記芯金における径方向途中部位に円形の孔が形成され、前記円形の孔の周面に巻込むように延長された弾性シール部材の周壁に弁機構を取付けるといった簡単な作業でもって製造することができ、また、シール部材の弾性シール体の周壁に係止片が係止し、弁機構がシール部材に対して容易かつ強固に固定され、かつ厳しい使用条件下であっても、弁機構はシール部材に対して長期的に保持される。
【図面の簡単な説明】
【図１】本発明の実施形態を示す転がり軸受装置の全体構成を示す断面図である。
【図２】同じく第一密封装置およびその周辺部分を示す断面図である。
【図３】同じく第一密封装置をさらに拡大した状態の断面図である。
【図４】同じく図３における一部省略側面図である。
【図５】同じく第二密封装置およびその周辺部分を示す断面図である。
【図６】同じく第二密封装置をさらに拡大した状態の断面図である。
【図７】他の実施形態を示す第一密封装置およびその周辺部分を示す断面図である。
【符号の説明】
１圧延機のロール
２ロールネック
４〜６外輪部材
７，８内輪部材
９〜１２円すいころ
１８第一密封装置
１９シール部材
２１弁体
２２弁機構
２４芯金
２５弾性シール体
２７膨出部
２８固定部
２９リップ部
３２巻込み部
３３本体
３４フランジ
３５通気孔
３６係止凸片
Ｂ転がり軸受装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing sealing device and a rolling bearing device for rotatably supporting, for example, a roll neck portion of a roll provided in a rolling mill.
[0002]
[Prior art]
Generally, a roll neck rolling bearing device attached to a rolling mill has multi-row tapered roller bearings. Grease is enclosed in these multi-row tapered roller bearings during assembly, and seal members for preventing the grease from leaking to the outside are disposed at both ends of the roll neck bearing device.
[0003]
By the way, generally, a rolling mill is subjected to an acceleration / deceleration pattern operation in a work process. Then, due to the acceleration / deceleration pattern operation of the rolling mill and the occurrence of a temperature difference between the inside and outside of the roll neck bearing device, the inside of the roll neck bearing device becomes negative pressure, and the cooling water is used for the roll neck. It may enter the inside of the bearing device.
[0004]
Therefore, in order to cope with the pressure difference between the inside and outside of the roll neck bearing device, a vent hole is provided in the seal member, and a vent hole or valve that opens and closes according to the pressure difference between the inside and outside of the roll neck bearing device is provided in this vent hole portion. A member is provided.
[0005]
[Problems to be solved by the invention]
In the roll neck bearing device, it is necessary to attach a valve member attached to a sealing device (seal member) to the vent hole portion. Further, in the valve member that only opens and closes according to the pressure difference between the inside and outside of the roll neck bearing device, cooling water may enter the air as the air flows into the roll neck bearing device. There is a concern that the life of the roller neck bearing device may be reduced.
[0006]
[Means for Solving the Problems]
A rolling bearing sealing device according to claim 1 of the present invention is rollable between an outer ring member, an inner ring member concentrically arranged radially inward of the outer ring member, and the outer ring member and the inner ring member. A seal for sealing an annular space between the outer ring member and the inner ring member in a rolling bearing including a rolling element arranged to prevent the lubricant in the annular space from leaking to the outside of the rolling bearing. A rolling bearing sealing structure including a member, wherein the seal member includes a cored bar and an elastic seal body formed integrally with the cored bar, and the seal member has a circular shape in the middle in the radial direction of the cored bar . hole is formed, the peripheral wall of the circumferential surface entangle as extended elastic seal member of said circular hole, the valve mechanism is fitted with a valve member for the pressure adjustment between the inside and the outside of the rolling bearing is deposited on the outer peripheral portion of the valve mechanism, A plurality of annular locking pieces protruding outward in the radial direction from the outer peripheral portion are formed, and one axial side of the outer peripheral portion of the valve mechanism is larger in diameter than the outer peripheral portion. A flange portion is formed, and the first locking piece of the valve mechanism and the flange portion are formed on both sides of the elastic seal body in the axial direction so as to overlap the elastic seal body in the radial direction of the outer peripheral portion; The second locking piece of the mechanism is formed so as to overlap the core metal in the axial direction and engages with the elastic seal body so as to be buried.
[0007]
In the rolling bearing sealing device having the above-described configuration , a circular hole is formed in a radially intermediate portion of the core member of the sealing member, and the peripheral wall of the elastic sealing member is extended so as to be wound around the peripheral surface of the circular hole. When a valve mechanism having a valve body for adjusting the pressure between the inside and the outside of the rolling bearing is fitted , a locking piece is engaged with the peripheral wall of the elastic seal body, and the valve mechanism is attached to the seal member. On the other hand, it is firmly fixed.
[0008]
A rolling bearing sealing device according to a second aspect of the present invention is the rolling bearing sealing device according to the first aspect , wherein an outer peripheral portion of the valve mechanism, the first locking piece, and the second locking member are provided. and the engaging piece, and the flange portion are integrally formed by synthetic resin or metal.
A rolling bearing sealing device according to claim 3 of the present invention is the rolling bearing sealing device according to claim 1 or 2, wherein the axial direction of the first locking piece and the second locking piece is the same. The surface opposite to the flange portion is an inclined surface that expands in the axial direction toward the flange portion.
A rolling bearing sealing device according to a fourth aspect of the present invention is the rolling bearing sealing device according to any one of the first to third aspects, wherein the valve body is capable of passing air and has moisture and oil content. The material which can block is used. In this case, even when a pressure difference is generated between the inside and outside of the rolling bearing, moisture is prevented from entering the inside of the rolling bearing, so that a predetermined life of the rolling bearing can be ensured.
A rolling bearing device according to a fifth aspect of the present invention includes the inner ring member, the outer ring member, the rolling element, and the rolling bearing sealing device according to any one of the first to fourth aspects, The rolling bearing sealing device seals an annular space between the inner ring member and the outer ring member from an external space.
A rolling bearing device according to a sixth aspect of the present invention includes the inner ring member, the outer ring member, the rolling element, and the rolling bearing sealing device according to any one of the first to fourth aspects, The rolling elements are tapered rollers arranged in four rows, and the inner ring raceway surface in contact with the tapered rollers in the inner ring member is a first inner ring raceway whose diameter increases in order from one axial side to the other axial side. A second raceway surface to be reduced in diameter, a third raceway surface to be enlarged, and a fourth raceway surface to be reduced in diameter, and the rolling bearing sealing device includes the inner ring member, An annular space between the outer ring member and the outer space is sealed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a rolling bearing sealing device according to an embodiment of the present invention will be described with reference to the drawings, taking a sealing device used for a roll neck rolling bearing device as an example. 1 is a cross-sectional view showing the overall configuration of a roll neck rolling bearing device including a sealing device, FIG. 2 is an enlarged cross-sectional view of a first sealing device portion in FIG. 1, and FIG. 3 is an enlarged view of the first sealing device in FIG. 4 is a partially omitted side view in FIG. 3, FIG. 5 is an enlarged sectional view of the second sealing device in FIG. 1, and FIG. 6 is a further enlarged sectional view of the second sealing device in FIG.
[0014]
In the figure, 1 indicates a roll of the rolling mill, and 2 indicates the roll neck. The rolling bearing device B according to the present invention has outer ring members 4, 5, and 6 that are non-rotatably fitted in the housing 3 and arranged in the axial direction. These outer ring members 4, 5, and 6 are an outer ring member 4, 6 having a single-row track on the end side disposed on both sides in the axial direction, and a double-row track disposed between these outer ring members 4, 6. And an outer ring member 5 having The rolling bearing device B includes a pair of double-row inner ring members 7 and 8 in the axial direction that are rotatably arranged around the axis center in the radial direction of the outer ring members 4, 5, and 6. Reference numeral 2 a in FIG. 1 denotes an oil groove for supplying a lubricant between the inner ring members 7 and 8 and the roll neck 2.
[0015]
Between the outer ring members 4, 5, 6 and the inner ring members 7, 8, four rows of tapered rollers 9, 10, 11, 12 as rolling elements are provided on the raceway surfaces of the outer ring members 4, 5, 6, and the inner ring member. 7 and 8 are disposed between the raceway surfaces so as to freely roll.
[0016]
The tapered rollers 9 and 10 in two rows on one side share one inner ring member 7 between the one inner ring member 7 and one outer ring member 4 and one side of the central outer ring member 5. The other two rows of tapered rollers 11 and 12 share the other inner ring member 8 between the other inner ring member 8 and the other outer ring member 6 and the central outer ring member 5. Between the other side. The tapered rollers 9, 10, 11, 12 in each row are arranged at equidistant positions in the circumferential direction by the cage 13.
[0017]
The outer ring members 4 and 6 on the both sides and the outer ring member 5 at the center are arranged via a spacer (reference number omitted) having a predetermined length in the axial direction. A greasing pipe 14 for supplying a lubricant is attached.
[0018]
Further, the rolling bearing device B has first sealing devices 18 and 18 disposed on both sides of the annular space 15 between the outer ring members 4, 5 and 6 and the inner ring members 7 and 8, respectively.
[0019]
As shown in FIG. 2, each first sealing device 18 is disposed at a midpoint in the radial direction of the seal member 19 for preventing the lubricant in the annular space 15 from leaking to the outside. It has a valve mechanism 22 that is attached to the opening 20 and includes a valve body 21 for adjusting the pressure inside and outside the bearing. Such first sealing devices 18, 18 are arranged on the inner side in the system direction with respect to the radial outer holders 23, 23 arranged at both ends of the outer ring members 4, 6, respectively. It is arranged in a space between the inner ring members 7 and 8.
[0020]
Since the first sealing device 18 on the other side has the same configuration as that of the first sealing device 18 on the one side and a symmetrical configuration, only the first sealing device 18 on one side is shown in FIG. In FIG. 2, reference numeral 31 denotes an O-ring that is fitted in a recess 23 a formed on the outer periphery of the holder 23 and seals between the housing 3 and the holder 23.
[0021]
The seal member 19 includes a cored bar 24, an elastic seal body 25 formed integrally with the cored bar 24, a lip portion 29 formed integrally with the elastic seal body 25 in contact with the outer peripheral surface of the inner ring member 8, The lip portion 29 is composed of a coil spring 30 for pressing the lip portion 29 toward the outer peripheral surface of the inner ring member 8.
[0022]
The cored bar 24 includes an annular support portion 26 incorporated in the inner peripheral surface of the holder 23, and an annular bulge portion 27 that bulges outward in the axial direction at a radially inner portion of the support portion 26. Composed.
[0023]
The elastic seal body 25 is formed integrally with the core metal 24, and is fixed to the radially outer portion of the bulging portion 27 of the core metal 24 and is fitted to the inner peripheral surface of the holder 23. It is fixed to.
[0024]
As shown in FIG. 3, a hole 20a having a circular shape in a side view is formed at a predetermined position in the circumferential direction of the side wall of the bulging portion 27 of the metal core 24, and is bent so as to be wound around the peripheral surface of the hole 20a. A winding portion 32 of the elastic seal body 25 is formed, and an opening 20 having the winding portion 32 as a peripheral wall is formed.
[0025]
The opening 20 is fitted with a synthetic resin or metal valve mechanism 22 having the valve body 21 for adjusting the pressure inside and outside the rolling bearing. The valve mechanism 22 includes a disc-shaped main body 33 and a flange 34 that is integrally formed outside the main body 33 in the axial direction and has a larger diameter than the main body 33.
[0026]
A vent hole 35 for ventilating the inside and outside of the rolling bearing is formed at the center of the valve mechanism 22. When the main body 33 is fitted to the peripheral surface of the opening 20, the outer peripheral portion tip position and the peripheral portion intermediate position of the main body 33 are related to the axially inner end surface of the opening 20 and the peripheral surface intermediate position of the winding portion 32. The mating annular locking projections 36a and 36b are formed.
[0027]
A seat surface 37 having a diameter larger than that of the vent hole 35 is formed on the main body 33 of the valve mechanism 22, and the valve body 21 for adjusting the pressure inside and outside the rolling bearing is seated on the seat surface 37. . The valve body 21 is formed in a film shape with a material through which air can pass and which can block moisture and oil. The valve body 21 is a material excellent in gas permeability, adhesiveness, toughness, weather resistance, and the like. For example, Gore-Tex (trade name) obtained by specially processing polytetrafluoroethylene (PTFE) material is used. . The valve body 21 is held by the main body 33 via an annular holding member 39 by reducing the diameter of the side surface of the main body 33 to form a holding piece 38.
[0028]
As shown in FIG. 5, the rolling bearing device B includes a second sealing device 45 that fits into the outer peripheral recess 40 in the portion between the contact surfaces between the inner ring members 7 and 8. The second sealing device 45 includes a seal member 46 and a valve mechanism 48 having a valve body 47 for adjusting the pressure inside and outside the rolling bearing.
[0029]
The seal member 46 has an annular cored bar 49 having an L-shaped cross section and a radial lip 50 that comes into contact with the bottom surface of the outer peripheral recess 40 between the inner ring members 7, 8. An elastic seal body 51 is included. The seal member 46 has an opening 52 at a substantially central position thereof. As shown in FIG. 6, a recess 53 that communicates with the opening 52 is formed at the center position of the cored bar 49.
[0030]
The valve mechanism 48 is disposed at a predetermined position in the circumferential direction of the seal member 46. The valve mechanism 48 includes a flange portion 54 attached to the bottom surface of the recess 53 and a body portion 55 having a smaller diameter than the flange portion 54. The body 55 is inserted through the opening 52 so as to extend from the cored bar 49 to the elastic seal.
[0031]
A seat surface 54a on which a valve body 47 for adjusting the pressure inside and outside the rolling bearing is seated is formed on the flange portion 54. The valve body 47 can pass air and can block moisture and oil. Is used. This is, for example, a Gore-Tex (trade name) formed in a sheet shape as described above, and is formed in a film shape.
[0032]
The valve body 47 is held by the flange portion 54 via an annular restraining member 57 by reducing the diameter of the radially outer surface portion of the flange portion 54 to form a holding piece 56. Several grooves 58 are formed on the outer peripheral surface of the body portion 55, and these grooves 58 are filled with an adhesive.
[0033]
In the rolling bearing device B having the above-described configuration, the valve mechanism 22 in the first sealing device 18 is configured such that the valve body 21 is brought into contact with the seat surface 37 of the main body 33 and the restraining member 39 is stacked on the valve body 21. By reducing the diameter of the corresponding portion to form the holding piece 38, the valve body 21 is held on the main body 33 via the restraining member 39.
[0034]
The first sealing device 18 is manufactured by assembling the valve mechanism 22 assembled as described above to the seal member 19. That is, the main body 33 of the valve mechanism 22 is inserted into the opening 20 (winding portion 32) in the bulging portion 27 of the core metal 24, and the flange 34 is pushed in until it comes into contact with the fixing portion 28 of the elastic seal body 25.
[0035]
In this way, the engaging convex piece 36b in the middle position of the main body 33 is engaged in the middle of the opening 20 so as to be buried against the elasticity of the winding portion 32, and a triangular cross section in the tip position of the main body 33. The locking convex piece 36 a is locked to the end surface of the winding portion 32.
[0036]
As described above, the first sealing device 18 can be attached to the seal member 19 so that the valve mechanism 22 is not easily removed by a simple operation of inserting the valve mechanism 22 into the seal member 19. Further, since the locking projections 36a and 36b formed on the main body 33 of the valve mechanism 22 are locked and firmly attached to the seal member 19, even if the first sealing device 18 is used under severe conditions, the valve It is possible to prevent the mechanism 22 from being detached from the seal member 19 and generating a gap with the opening 20.
[0037]
In addition, since the valve mechanism 22 includes a valve body 21 for adjusting the pressure between the inside and outside of the rolling bearing, the rolling mill performs an acceleration / deceleration pattern operation in the work process, and the temperature difference between the inside and outside of the rolling bearing. When this occurs, it is possible to prevent air from passing through the valve body 21 and generating a pressure difference between the inside and outside of the rolling bearing. The valve body 21 allows air to pass through and blocks moisture and oil, thereby preventing cooling water from entering from the outside of the rolling bearing and preventing the lubricant inside the rolling bearing from escaping. Can extend the life of the rolling bearing.
[0038]
The second sealing device 45 is assembled by inserting the valve mechanism 48 from the body portion 55 into the opening 52 of the seal member 46 and contacting the flange portion 54 against the bottom surface of the recess 53. Further, an adhesive is applied to the outer peripheral surface of the body 55 of the valve mechanism 48 to fill the groove 58 with the adhesive, or the diameter of the recess 53 is formed larger than the diameter of the flange 54, Further, an adhesive is filled. By doing so, the sealing member 46 and the valve mechanism 48 in the second sealing device 45 can be more firmly fixed.
[0039]
The second sealing device 45 can also be manufactured by a simple operation such as inserting the valve mechanism 48 into the sealing member 46 in the same manner as the first sealing device 18.
[0040]
In the second sealing device 45, as in the case of the first sealing device 18, only the exchange of air is performed through the valve body 47 inside and outside the rolling bearing, so that cooling water enters from the outside of the rolling bearing. And prevent the lubricant inside the rolling bearing from leaching out.
[0041]
FIG. 7 is a cross-sectional view showing another embodiment of the first sealing device 59. The embodiment shown in FIG. 2 is the same as the embodiment except for the first sealing device 59, and therefore, the same reference numerals as those in FIG.
[0042]
The first sealing device 59 shown in FIG. 7 includes an annular seal member 60 for preventing the lubricant in the annular space 15 from leaking to the outside, and an opening formed at a midway position in the radial direction of the seal member 60. And a valve mechanism 63 having a valve body 62 for adjusting the pressure inside and outside the bearing.
[0043]
The seal member 60 includes a cored bar 64 having an L-shaped cross section and an elastic seal body 65 formed integrally with the cored bar 64.
[0044]
The elastic seal body 65 includes a fixed portion 66 fixed to the cored bar 64, a lip portion 67 that is integrally formed radially inward of the fixed portion 66 and contacts the outer peripheral surface of the inner ring member 8, and the lip The coil spring 68 is configured to press the portion 67 against the outer peripheral surface of the inner ring member 8. Such a first sealing device 59 is attached to the holders 23 arranged so as to be adjacent to the ends of the outer ring members 4 and 6 on both sides.
[0045]
A hole 71 is formed at a predetermined position in the circumferential direction in the middle portion of the side wall of the cored bar 64, and a winding part 72 that is bent so as to wind around the peripheral surface of the hole 71 is formed in a part of the fixing part 66. Thus, an opening 61 is formed.
[0046]
A metal valve mechanism 63 having the valve body 62 for adjusting the pressure inside and outside the rolling bearing is fitted into the opening 61. The valve mechanism 63 includes a cylindrical main body 73 and a flange 74 that is integrally formed on the inner side in the axial center direction of the main body 73 and has a larger diameter than the main body 73.
[0047]
A vent hole 75 for ventilating the inside and outside of the rolling bearing is formed at the center of the valve mechanism 63. The valve body 62 is provided halfway along the main body 73 so as to cover the axially outer side of the vent hole 75. The valve body 62 is made of the same material as that of the above embodiments.
[0048]
In the above configuration, the valve mechanism 63 in the first sealing device 59 covers the valve body 62 so as to cover the vent hole 75 of the main body 73 in the valve mechanism 63 and is fixed to the middle of the main body 73, and the opening 61 of the cored bar 64. The main body 73 of the valve mechanism 63 is assembled so as to be inserted until the flange 74 comes into contact with the elastic seal body 65.
[0049]
By applying an adhesive 76 between the valve body 62 and the flange 74, the valve mechanism 63 is more firmly bonded and fixed to the opening 61.
[0050]
Thus, the first sealing device 59 can be assembled by a simple operation such as mounting the valve mechanism 63 to the opening 61. Further, when a temperature difference occurs between the inside and outside of the rolling bearing, air passes through the valve body 62, thereby preventing a pressure difference from being generated inside and outside the rolling bearing. The valve body 62 allows air to pass through and blocks moisture and oil, thereby preventing cooling water from entering from the outside of the rolling bearing and preventing the lubricant inside the rolling bearing from escaping. Can extend the life of the rolling bearing.
[0051]
In the above embodiment, Gore-Tex (trade name) obtained by specially processing a polytetrafluoroethylene material is used as the valve bodies 21, 47, 62, but is not limited thereto. For example, a polytetrafluoroethylene sheet formed by stretching a polytetrafluoroethylene material and a non-woven fabric formed by compressing hairs and fibers may be used. In this case as well, air can be permeated and moisture is blocked, so that the cooling water can be prevented from entering from the outside of the rolling bearing as well as the lubricant inside the rolling bearing. This can extend the life of the rolling bearing.
[0052]
【The invention's effect】
As is apparent from the above description, according to the present invention, the sealing device is extended so that a circular hole is formed in a midway portion in the radial direction of the core of the sealing member and is wound around the circumferential surface of the circular hole. The valve mechanism can be manufactured by a simple operation such as attaching the valve mechanism to the peripheral wall of the elastic seal member, and the locking piece is locked to the peripheral wall of the elastic seal body of the seal member, The valve mechanism is held against the seal member for a long period of time even if it is easily and firmly fixed and is used under severe conditions.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an overall configuration of a rolling bearing device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the first sealing device and its peripheral part.
FIG. 3 is a sectional view of the first sealing device in a further enlarged state.
4 is a partially omitted side view of FIG. 3. FIG.
FIG. 5 is a cross-sectional view showing the second sealing device and its peripheral portion in the same manner.
FIG. 6 is a sectional view of the second sealing device in a further enlarged state.
FIG. 7 is a cross-sectional view showing a first sealing device showing another embodiment and a peripheral portion thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll of rolling mill 2 Roll necks 4-6 Outer ring members 7, 8 Inner ring members 9-12 Tapered roller 18 First sealing device 19 Seal member 21 Valve body 22 Valve mechanism 24 Core metal 25 Elastic seal body 27 Expansion part 28 Fixation Part 29 lip part 32 winding part 33 main body 34 flange 35 vent hole 36 locking convex piece B rolling bearing device

Claims

The outer ring member in a rolling bearing including an outer ring member, an inner ring member concentrically disposed radially inward of the outer ring member, and a rolling element that is freely rollable between the outer ring member and the inner ring member; A rolling bearing sealing structure including a sealing member for sealing an annular space between the inner ring member and preventing the lubricant in the annular space from leaking to the outside of the rolling bearing,
The seal member includes a cored bar and an elastic seal body integrally formed with the cored bar,
A circular hole is formed in the middle portion of the seal member in the radial direction in the cored bar,
A valve mechanism having a valve body for adjusting pressure between the inside and the outside of the rolling bearing is fitted to the peripheral wall of the elastic seal body extended so as to be wound around the circumferential surface of the circular hole,
A plurality of annular locking pieces projecting radially outward from the outer peripheral portion are formed on the outer peripheral portion of the valve mechanism, and on the one axial side of the outer peripheral portion of the valve mechanism. Is formed with a flange portion having a larger diameter than the outer peripheral portion,
The first locking piece of the valve mechanism and the flange portion are formed so as to overlap the elastic seal body in the radial direction of the outer peripheral portion on both sides in the axial direction of the elastic seal body,
2. The rolling bearing sealing device according to claim 1, wherein the second locking piece of the valve mechanism is formed so as to overlap the core metal in the axial direction and is embedded in the elastic seal body.

The rolling bearing sealing device according to claim 1,
And the outer peripheral portion of the valve mechanism, the sealing rolling bearing, characterized in that it is formed integrally with the first locking piece and the second engaging piece, and the flange portion of a synthetic resin or metal apparatus.

A rolling bearing sealing device according to claim 1 or 2,
The surface opposite to the flange portion in the axial direction of the first locking piece and the second locking piece is an inclined surface that expands in the axial direction toward the flange portion. Sealing device for rolling bearing.

A rolling bearing sealing device according to any one of claims 1 to 3,
A rolling bearing sealing device characterized in that a material capable of passing air and blocking moisture and oil is used as the valve body.

The inner ring member;
The outer ring member;
The rolling element;
A rolling bearing sealing device according to any one of claims 1 to 4,
With
The rolling bearing sealing device is a rolling bearing device that seals an annular space between the inner ring member and the outer ring member from an external space.

The inner ring member;
The outer ring member;
The rolling element;
A rolling bearing sealing device according to any one of claims 1 to 4,
With
The rolling elements are tapered rollers arranged in four rows,
The inner ring raceway surface in contact with the tapered roller in the inner ring member, in order from one axial side to the other axial side, is a first inner ring raceway whose diameter is increased, a second raceway surface whose diameter is reduced, and an expansion. A third raceway surface to be diametered and a fourth raceway surface to be reduced in diameter,
The rolling bearing sealing device is a rolling bearing device that seals an annular space between the inner ring member and the outer ring member from an external space.