JP3710194B2 - Sealing device - Google Patents

Description

【０００１】
【産業上の利用分野】
本発明は、各種装置の軸封部等に用いられる密封装置に関し、特に２つのシール部材を組み合わせた組立型の密封装置に関する。
【０００２】
【従来の技術】
従来のこの種の組立型の密封装置としては、たとえば、図５に示すようなものが知られている。
【０００３】
すなわち、ハウジング１００の軸孔１０１と、この軸孔１０１内に移動自在に挿入される移動軸１０２間の環状隙間をシールするもので、軸方向に並べて設けられる第１および第２シール部材１０３，１０４を備えている。第１シール部材１０３には前記第２シール部材１０４側に向かって軸方向に延びる筒状部１０５が設けられ、この筒状部１０５内周に第２シール部材１０４外周が軸方向に圧入されて組み付けられていた。
【０００４】
特に、図５(ａ)は筒状部１０５内周と第２シール部材１０４外周が金属同士の嵌合、図５(ｂ)は筒状部１０５内周が金属、第２シール部材１０４がゴム状弾性材である場合、同図５(ｃ)は筒状部１０５内周がゴム状弾性材、第２シール部材１０４外周が金属の場合である。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記した従来技術にあっては、第１シール部材１０３の筒状部１０５内周と第２シール部材１０４外周間の嵌合力はお互いの嵌合しろによっている。
【０００６】
そのため、外力の影響等で嵌合しろが無くなった場合等の抜け止め機構が無かった。
【０００７】
本発明は上記した従来技術の問題点を解決するためになされたもので、その目的とするところは、組立てた第１，第２シール部材の離脱を防止し得る密封装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明にあっては、
ハウジングの軸孔と該軸孔内に移動自在に挿入される移動軸間の環状隙間をシールするもので、
軸方向に並べて設けられる第１および第２シール部材を備え、
前記第１シール部材に前記第２シール部材側に向かって軸方向に延びる筒状部を設け、該筒状部内周には金属環を備えた前記第２シール部材外周と軸方向に嵌合する嵌合面を設けて組み付けた密封装置において、
前記第１シール部材の筒状部内周であって前記嵌合面よりも前記筒状部の開口端側に内向き突起を設けると共に前記第２シール部材外周に外向き突起を設け、前記外向き突起の外径を前記内向き突起の内径よりも大きく設定し、凹状に形成され前記第２シール部材を組み込んだ状態で前記外向き突起が嵌合される外向き突起嵌合面を前記筒状部内周であって前記内向き突起と前記嵌合面との間に設け、前記第１シール部材の筒状部の嵌合面及び前記外向き突起嵌合面には軸方向に通じる空気抜き用の通路が形成され、前記外向き突起は前記金属環の前記嵌合面に嵌合する部分より前記開口端側へはずれた位置に形成されると共にゴム状弾性材によって構成されたことを特徴とする。
【０００９】
本発明にあっては、第２シール部材を第１シール部材の筒状部内周に軸方向に圧入していくと第２シール部材の外向き突起が第１シール部材の筒状部内周の内向き突起に対して軸方向に当接し、さらに強く押し込むと外向き突起と内向き突起の当接部が半径方向に弾性変形して、外向き突起が内向き突起を乗り越えて筒状部の開口端とは反対側に位置する。
【００１０】
したがって、第２シール部材を組み込んだ状態では、外向き突起が内向き突起に干渉して第２シール部材の抜け止めが図られる。
【００１１】
さらに、内向き突起と外向き突起の少なくともいずれか一方をゴム状弾性材によって構成しているので、組み込み時に内向き突起と外向き突起間の当接部が弾性変形がしやすく、組み込み作業が容易にできる。
【００１２】
第１シール部材の筒状部内周に設けられる内向き突起の筒状部先端側の端縁には先端側に向かって徐々に拡径する挿入ガイド用テーパ面が設けられていることを特徴とする。
【００１３】
また、第２シール部材外周の外向き突起の挿入方向先端側の端縁に挿入方向に向かって徐々に縮径される挿入ガイド用テーパ面が設けられていることを特徴とする。
【００１４】
このように、内向き突起や外向き突起に挿入ガイド用テーパ面を設けておけば、この挿入ガイド用テーパ面に沿って徐々に弾性変形して、外向き突起がスムーズに内向き突起を乗り越え、組込み性が向上する。
【００１５】
【実施の形態】
以下に本発明を図示の実施の形態に基づいて説明する。
【００１６】
図１乃至図３には、本発明の一実施の形態に係る密封装置を示している。
【００１７】
図中、１は密封装置全体を示すもので、概略、ハウジング２の軸孔３と軸孔３内に回転方向（回転運動）あるいは軸方向（往復運動）に移動自在に挿入される移動軸４間の環状隙間をシールするもので、軸方向に並べて設けられる第１，第２シール部材１０，２０を備えている。
【００１８】
第１シール部材１０には第２シール部材２０側に向かって軸方向に延びる筒状部としての外筒部１１が設けられ、この外筒部１１内周に第２シール部材２０外周が嵌合して組み付けられている。
【００１９】
第１シール部材１０は軸方向密封対象流体側に開いた断面略Ｊ字形状の環状部材で、ハウジング２の軸孔３内周に嵌合される前記外筒部１１と、この外筒部１１の軸方向一端から半径方向内方に向かって延びる内向きフランジ部１２と、この内向きフランジ部１２の内径端から外筒部１１と同一方向に延びる第１リップ部１３と、を備えている。第１リップ部１３は外筒部１１の略半分程度の長さにわたって軸方向に延びており、リップ先端１４が移動軸４の外周面に摺動自在に密封接触しており、リップ先端１４の背面側には緊迫力を付与するためのばね部材１５が装着されている。
【００２０】
また、第１リップ部１３の基端部には、第１リップ部１３と反対方向に傾斜して延びる補助リップ１６が設けられている。
【００２１】
第１シール部材１０はゴム状弾性材製の型成形品で、外筒部１１と内向きフランジ部１２内に断面Ｌ字形状の第１金属環１７が埋設されている。すなわち、外筒部１１は第１金属環１７の内周と外周にゴム状弾性材１８が被覆され、さらに内向きフランジ部１２についても、その両側面がゴム状弾性材１９によって被覆されている。
【００２２】
第２シール部材２０は断面逆Ｌ字形状の環状部材で、第１シール部材１０の外筒部１１内周に嵌合される内筒部２１と、内筒部２１の前記第１シール部材１０の内向きフランジ部１２と反対側の端部から半径方向内方に向かって延びる内向きフランジ部２２と、この内向きフランジ部２２の内径端に設けられた第２リップ部２３と、から構成されている。
【００２３】
この第２シール部材２０もゴム状弾性材製の型成形品で、第２金属環２４とゴム状弾性材２５とから構成されている。
【００２４】
第１シール部材２０の外筒部１１内周には内向き突起５が設けられ、第２シール部材２０外周には外向き突起６が設けられている。この外向き突起６の外径φＢは内向き突起５の内径φＡよりも大きく設定し、第２シール部材２０を組み込んだ状態で外向き突起６が内向き突起５に対して外筒部１１の開口端とは反対側（以下、基端側と称す）に位置するように構成されている。
【００２５】
第１シール部材１０の内向き突起５は、外筒部１１の先端部内周に突出形成されており、内向き突起５を除いた外筒部１１の基端部から内向き突起５手前までの範囲には、第２シール部材２０外周の第２金属環２４が嵌合される金属環嵌合面７１と、外向き突起６が嵌合される外向き突起嵌合面７２とが形成されている。金属環嵌合面７１の内径は内向き突起５の内径φＡとほぼ等しくなっており、外向き突起嵌合面７２は、金属環嵌合面７１と内向き突起５の間で凹状に成形されている。金属環嵌合面７１と第２金属環２４間の嵌合は嵌合しろを有するしまりばめであることが必要であるが、外向き突起嵌合面７２と外向き突起６間の嵌合は、しまりばめに限られず、図示するように隙間を有するすきまばめでも、また中間ばめでもよい。
【００２６】
また、第１，第２シール部材１０，２０間の空間の負圧が問題になる場合を考慮し、金属環嵌合面７１および外向き突起嵌合面７２には適宜空気抜き用の通路を構成する溝等を設けられている。図示例では外向き突起嵌合面７２と内向き突起５に軸方向に延びる溝が形成されている。金属環嵌合面７１には、図示していないが適宜溝等を形成する。
【００２７】
内向き突起５はゴム状弾性材で形成され、その外筒部１１の先端側端縁には先端側に向かって徐々に拡径する円錐状の第１挿入ガイド用テーパ面８１が設けられている。この第１挿入ガイド用テーパ面８１の軸に対する傾斜角度αは、圧入しやすいように小さい角度に設定されている。
【００２８】
また、内向き突起５の外筒部１１基端側の端縁には、外筒部１１の軸方向基端部に向けて徐々に拡径するように傾斜する円錐状の第１抜き出しガイド用テーパ面９１が形成されている。この抜き出しガイド用テーパ面９１の角度βは、逆に離脱しにくいように、第１挿入ガイド用テーパ面８１の傾斜角度αよりも大きい角度に設定されている。
【００２９】
第２シール部材２０外周の外向き突起６は、第２シール部材２０の内筒部２１の挿入方向後端部外周に設けられるもので、この後端部２１ａは第２金属環２４の後端よりも後方に延びておりゴム状弾性材のみで構成されている。この外向き突起６の挿入方向先端側の端縁には挿入方向に向かって徐々に縮径される第２挿入ガイド用テーパ面８２が設けられている。この第２挿入ガイド用テーパ面８２の傾斜角度α′は、第１シール部材１０内周の内向き突起５に設けられた第１挿入ガイド用テーパ面８１の傾斜角度αと同程度に設定されている。
【００３０】
また、外向き突起６の抜き出し方向先端側（挿入方向後端側）の端縁には、抜き出し方向に向かって徐々に縮径されるように傾斜する第２抜き出しガイド用テーパ面９２が設けられている。この第２抜き出しガイド用テーパ面９２の傾斜角度は第１抜き出しガイド用テーパ面９１と同程度に設定され、離脱しにくい構成となっている。
【００３１】
本発明にあっては、第２シール部材２０を第１シール部材１０の外筒部１１内周に軸方向に圧入していくと第２シール部材２０の外向き突起６が第１シール部材１０の外筒部１１内周の内向き突起５に対して軸方向に当接し、さらに強く押し込むと外向き突起６と内向き突起５の当接部が半径方向に弾性変形して、外向き突起６が内向き突起５を乗り越えて外筒部１１の基端側に位置する。
【００３２】
したがって、第２シール部材２０を組み込んだ状態では、外向き突起６が内向き突起５に干渉して第２シール部材２０の抜け止めが図られる。
【００３３】
内向き突起５と外向き突起６の少なくともいずれか一方をゴム状弾性材によって構成しておけば、組み込み時に内向き突起５と外向き突起６間の当接部が弾性変形しやすく、組み込み作業が容易にできる。
【００３４】
また、内向き突起５や外向き突起６に第１，第２挿入ガイド用テーパ面８１，８２が設けられているので、この第１，第２挿入ガイド用テーパ面８１，８２に沿って徐々に弾性変形し、外向き突起６がスムーズに内向き突起５を乗り越えるので、組込み性が向上する。
【００３５】
［実施の形態２］
図２には本発明の実施の形態２を示している。
【００３６】
この実施の形態２に係る密封装置２０１も、ハウジング２０２の軸孔２０３と軸孔２０３内に移動自在に挿入される移動軸２０４間の環状隙間をシールするもので、軸方向に並べて設けられる第１および第２シール部材２１０，２２０を備えている。
【００３７】
第１シール部材２１０には、前記第２シール部材２２０側に向かって軸方向に延びる筒状部としての外筒部２１１が設けられ、この外筒部２１１内周に第２シール部材２２０外周を軸方向に嵌合して組み付けられている。
【００３８】
第１シール部材２１０は断面略Ｓ字形状の環状部材で、ハウジング２０２の軸孔２０３内周に嵌合される前記外筒部２１１と、この外筒部２１１の軸方向一端から半径方向内方に向かって延びる内向きフランジ部２１２と、この内向きフランジ部２１２の内径端から外筒部２１１と逆方向に延びる第１リップ部２１３と、を備えている。外筒部２１１の先端部にはハウジング２０２の軸孔２０３の周縁に係合される係合フランジ部２１１ａが設けられている。
【００３９】
また、内向きフランジ部２１２の内径端部は第２シール部材２２０側に屈曲する段付き形状で、屈曲部２１２ａ先端に第１リップ部２１３が設けられている。この第１リップ部２１３は第２シール部材２２０と反対側に内向きフランジ部２１２の端面とほぼ同一位置まで延びて移動軸２０４外周面に対して摺動自在に密封接触している。このリップ先端２１４の背面側には緊迫力を付与するためのばね部材２１５が装着されている。
【００４０】
また、第１リップ部２１３の基端部には、第１リップ部２１３と反対方向に傾斜して延びる補助リップ２１６が設けられている。
【００４１】
第１シール部材２１０はゴム状弾性材製の型成形品で、係合フランジ部２１１ａ，外筒部２１１，内向きフランジ部２１２および屈曲部２１２ａにかけて第１金属環２１７が埋設されている。すなわち、外筒部２１１は第１金属環２１７の内周と外周にゴム状弾性材２１８が被覆され、さらに内向きフランジ部２１２についても、その両側面がゴム状弾性材２１９によって被覆されている。
【００４２】
第２シール部材２２０は断面Ｚ字形状の環状部材で、第１シール部材２１０の外筒部２１１内周に嵌合される内筒部２２１と、内筒部２２１の前記第１シール部材２１０の内向きフランジ部２１２と反対側の端部から半径方向内方に向かって延びる内向きフランジ部２２２と、この内向きフランジ部２２２の内径端に設けられる第２リップ部２２３と、から構成されている。この第２リップ部２２３は、第１シール部材２１０の第１リップ部２１３とは反対方向に延びている。
【００４３】
この内向きフランジ部２２２の内径端部は第１シール部材２１０の内向きフランジ部２１２側に屈曲する段付き形状となっており、屈曲部２２２ａの内径端に、第１シール部材２１０の第１リップ部２１３の軸方向反対方向に向かう第２リップ部２２３が設けられている。
【００４４】
この第２シール部材２２０も第２金属環２２４とゴム状弾性材２２５とから構成されるもので、内筒部の第１シール部材２１０の外筒部２１１内周に嵌合する嵌合面には第２金属環２２４が露出している。
【００４５】
この第２シール部材２２０の屈曲部２２２ａは第１シール部材２１０の屈曲部２１２ａと背面同士が突き合わされており、第１シール部材２１０と第２シール部材２２０との間に、内向きフランジ部２１２，２２２間に形成される第１環状空間２３０と、第１，第２リップ部２１３，２２３間に形成される第２環状空間２３１とを区画形成している。
【００４６】
第１シール部材２１０の屈曲部２１２ａの背面には、第２シール部材２２０側に向かって徐々に拡径するように開くゴム状弾性材によって形成されるサイドリップ２３２が設けられ、組み付けた際にサイドリップ２３２は変形することにより第２シール部材２２０の屈曲部２２２ａ背面に密接する。このサイドリップ２３２には一部切欠き２３２ａが設けられている。また、サイドリップ２３２が密接する第２シール部材２２０の屈曲部２２２ａ背面には第１，第２環状空間２３０，２３１とを連通する空気抜き用の溝２３３が設けられている。
【００４７】
第１シール部材２２０の外筒部２１１内周には内向き突起２０５が設けられ、第２シール部材２２０外周には外向き突起２０６が設けられている。この外向き突起２０６の外径φＢは内向き突起２０５の内径φＡよりも大きく設定され、第２シール部材２２０を組み込んだ状態で外向き突起２０６が内向き突起２０５に対して外筒部２１１の基端側に位置するように構成されている。
【００４８】
第１シール部材２１０の内向き突起２０５は、外筒部２１１の先端部内周に突出形成されており、内向き突起２０５を除いた外筒部２１１の基端部から内向き突起２０５手前までの範囲には、第２シール部材２２０外周の第２金属環２２４が嵌合される金属環嵌合面２７１と、外向き突起２０６が嵌合される外向き突起嵌合面２７２とが形成されている。金属環嵌合面２７１の内径は内向き突起２０５の内径φＡとほぼ等しくなっており、外向き突起嵌合面２７２は、金属環嵌合面２７１と内向き突起２０５の間で凹状に成形されている。
【００４９】
そして、金属環嵌合面２７１には空気抜き用の切欠き２７１ａが、内向き突起２０５および外向き突起嵌合面２７２には空気抜き用の溝２０５ａが形成されている。
【００５０】
内向き突起２０５はゴム状弾性材で形成され、その外筒部２１１の先端側端縁には先端側に向かって徐々に拡径する円錐状の第１挿入ガイド用テーパ面２８１が設けられている。この第１挿入ガイド用テーパ面２８１の軸に対する傾斜角度αは、圧入しやすいように小さい角度に設定されている。
【００５１】
また、内向き突起２０５の外筒部２１１基端側の端縁には、外筒部２１１の軸方向基端部に向けて徐々に拡径するように傾斜する円錐状の第１抜き出しガイド用テーパ面２９１が形成されている。この抜き出しガイド用テーパ面２９１の角度βは、逆に離脱しにくいように、第１挿入ガイド用テーパ面２８１の傾斜角度αよりも大きい角度に設定されている。
【００５２】
第２シール部材２２０外周の外向き突起２０６は、第２シール部材２２０の内筒部２２１の挿入方向後端部外周に設けられるもので、この後端部２２１ａは第２金属環２２４の後端よりも後方にひさし状に延びており、ゴム状弾性材のみで構成されている。この外向き突起２０６の挿入方向先端側の端縁には挿入方向に向かって徐々に縮径される第２挿入ガイド用テーパ面２８２が設けられている。この第２挿入ガイド用テーパ面２８２の傾斜角度α′は、第１シール部材２１０内周の内向き突起２０５に設けられた第１挿入ガイド用テーパ面８１の傾斜角度αと同程度に設定されている。
【００５３】
また、外向き突起２０６の抜き出し方向先端側（挿入方向後端側）の端縁には、抜き出し方向に向かって徐々に縮径されるように傾斜する第２抜き出しガイド用テーパ面２９２が設けられている。この第２抜き出しガイド用テーパ面２９２の傾斜角度は第１抜き出しガイド用テーパ面２９１と同程度に設定され、離脱しにくい構成となっている。
【００５４】
本発明にあっては、第２シール部材２２０を第１シール部材２１０の外筒部２１１内周に軸方向に圧入していくと第２シール部材２２０の外向き突起６が第１シール部材２１０の外筒部２１１内周の内向き突起２０５に対して軸方向に当接し、さらに強く押し込むと外向き突起２０６と内向き突起２０５の当接部が半径方向に弾性変形して、外向き突起２０６が内向き突起２０５を乗り越えて外筒部２１１の外向き突起嵌合面２７２に嵌合する。
【００５５】
したがって、第２シール部材２２０を組み込んだ状態では、外向き突起２０６が内向き突起２０５に干渉して第２シール部材２２０の抜け止めが図られる。
【００５６】
内向き突起２０５と外向き突起２０６の少なくともいずれか一方をゴム状弾性材によって構成しておけば、組み込み時に内向き突起２０５と外向き突起２０６間の当接部が弾性変形しやすく、組み込み作業が容易にできる。特に、この実施の形態では、内筒部２２１の後端部２２１ａがゴム状弾性材のみで形成され、しかも片持ちばり状に突出しているので、組立作業が一層簡単になる。
【００５７】
また、内向き突起２０５や外向き突起２０６に第１，第２挿入ガイド用テーパ面２８１，２８２が設けられているので、この第１，第２挿入ガイド用テーパ面２８１，２８２に沿って徐々に弾性変形し、外向き突起２０６がスムーズに内向き突起２０５を乗り越えるので、組込み性が向上する。
【００５８】
一方、第２シール部材２２０の内向きフランジ部２２２の屈曲部２２２ａが、第１シール部材２１０の内向きフランジ部２１２の屈曲部２１２ａに設けられたサイドリップ２３２を押圧し、屈曲部２２２ａ，２１２ａ同士がサイドリップ２３２を介して密接する。
【００５９】
また、第１，第２リップ部間の第２環状空間の負圧は、屈曲部間の溝、第１環状空間、切欠きおよび溝を通じて解消される。
【００６０】
［試験結果］
次に、図３に示すようなサンプルＳを製作し、その嵌合状態を試験した結果について説明する。サンプルＳは、上記実施の形態２における第１シール部材２１０の内向きフランジ部の屈曲部を切断したものである。
【００６１】
ー落下試験ー
試験は、まず、第１シール部材２１０に第２シール部材２２０を圧入して、第２シール部材２２０の傾斜量を測定する。
【００６２】
その後、５０，１００，１５０［ｃｍ］の高さから落下させ、第２シール部材２２０の傾斜量を測定した。
【００６３】
ー離脱力の測定（離脱試験）ー
さらに、図３に示すように、第２シール部材２２０の内向きフランジ部の屈曲部背面に抜き治具３００を当てて、離脱力を測定した。離脱スピードは２０［mm／sec］、サンプルＳとしては、落下試験前の正規品と落下試験後のサンプルおよび従来品について比較した。
【００６４】
試験結果を表１に、離脱力の比較を図４に示す。
【００６５】
第２シール部材２２０の傾斜量は、第２シール部材２２０のａ位置にダイアルゲージを当て、全体を回転させて、その最大値と最小値の差を読み取ることによって行われる。この傾斜量によって第１，第２シール部材２１０，２２０の嵌合状態を確認する。落下試験は離脱試験の方向と同一方向、すなわち第２シール部材２２０を下にして落下させた。
【００６６】
【表１】

表１および図４に示されるように、サンプルＮｏ．３〜８の落下試験前後の傾斜量には大きな差は無く、離脱荷重についてもほとんど差が無いことがわかる（落下前は２２０〜２３５［ｋｇｆ］、落下後は２０８〜２７０［ｋｇｆ］）。
【００６７】
これに対して、突起を設けない従来タイプ（Ｎｏ．１０１〜１０６）では、落下試験後の傾斜量が０．５６〜２．５４［ｍｍ］と変動が大きく、離脱するものもあった。また、離脱荷重についても３０〜９０［ｋｇｆ］と極端に低下しており、本発明のように内向きおよび外向き突起を設けることで嵌合状態が安定化することがわかる。従来品についても、正規の状態での傾斜量および離脱荷重は本発明のサンプルの正規の状態と同等の設定である。
【００６８】
【発明の効果】
以上説明したように、本発明にあっては、第１シール部材の筒状部内周に内向き突起を設けると共に第２シール部材外周に外向き突起を設け、外向き突起の外径を内向き突起の内径よりも大きく設定し、第２シール部材を組み込んだ状態で外向き突起を内向き突起に対して筒状部の開口端とは反対側に位置させたので、外向き突起が内向き突起に干渉して第２シール部材の抜け止めを図ることができる。
【００６９】
さらに、内向き突起と外向き突起の少なくともいずれか一方をゴム状弾性材によって構成しているので、組み込み時に内向き突起と外向き突起間の当接部が弾性変形がしやすく、組み込み作業が容易にできる。
【００７０】
また、第１シール部材の内向き突起の筒状部先端側の端縁あるいは第２シール部材の外向き突起の挿入方向先端側の端縁に挿入ガイド用テーパ面を設けることにより、組み込み作業が一層容易になる。
【図面の簡単な説明】
【図１】 図１(ａ)は本発明の実施の形態１に係る密封装置の要部断面図、同図(ｂ)は同図(ａ)の嵌合部の拡大断面図である。
【図２】 図２(ａ)は本発明の実施の形態２に係る密封装置の要部断面図、同図(ｂ)は同図(ａ)の第２のシール部材を取り外した状態の要部断面図、同図(ｃ)は同図(ａ)のＣ方向の部分矢視であり、第１シール部材２１０の内向き突起２０５を示す図である。
【図３】 図３は図２の密封装置の嵌合状態の試験方法を示す図である。
【図４】 図４は、本発明と従来例の第２シール部材の傾斜量と離脱力の関係を示すグラフである。
【図５】 図５は従来の種々の密封装置の要部断面図である。
【符号の説明】
１，２０１ 密封装置
２，２０２ ハウジング
３，２０３ 軸孔
４，２０４ 移動軸
１０，２１０ 第１シール部材
１１，２１１ 外筒部（筒状部）
２１１ａ 係合フランジ部
１２，２１２ 内向きフランジ部
２１２ａ 屈曲部
１３，２１３ 第１リップ部
１４，２１４ リップ先端
１５，２１５ ばね部材
１６，２１６ 補助リップ
１７，２１７ 第１金属環
１８，２１８ ゴム状弾性材
１９，２１９ ゴム状弾性材
２０，２２０ 第２シール部材
２１，２２１ 内筒部
２１ａ，２２１ａ 後端部
２２，２２２ 内向きフランジ部
２２２ａ 屈曲部
２３，２２３ 第２リップ部
２４，２２４ 第２金属環
２５，２２５ ゴム状弾性材
５，２０５ 内向き突起
６，２０６ 外向き突起
７１，２７１ 金属環嵌合面
７２，２７２ 外向き突起嵌合面
８１，８２，２８１，２８２ 第１，第２挿入ガイド用テーパ面
９１，９２，２９１，２９２ 第１，第２抜き出しガイド用テーパ面
２３０，２３１ 第１，第２環状空間
２３２ サイドリップ
２３２ａ 切欠き
２３３ 溝[0001]
[Industrial application fields]
The present invention relates to a sealing device used for a shaft seal portion of various devices, and more particularly to an assembly-type sealing device in which two seal members are combined.
[0002]
[Prior art]
As a conventional assembly-type sealing device of this type, for example, a device as shown in FIG. 5 is known.
[0003]
That is, it seals the annular gap between the shaft hole 101 of the housing 100 and the moving shaft 102 that is movably inserted into the shaft hole 101. The first and second seal members 103 provided side by side in the axial direction, 104 is provided. The first seal member 103 is provided with a cylindrical portion 105 that extends in the axial direction toward the second seal member 104, and the outer periphery of the second seal member 104 is press-fitted in the axial direction into the inner periphery of the cylindrical portion 105. It was assembled.
[0004]
5A shows that the inner periphery of the cylindrical portion 105 and the outer periphery of the second seal member 104 are metal-fitted, and FIG. 5B shows that the inner periphery of the cylindrical portion 105 is metal and the second seal member 104 is rubber. 5C shows a case where the inner periphery of the cylindrical portion 105 is a rubber-like elastic material and the outer periphery of the second seal member 104 is a metal.
[0005]
[Problems to be solved by the invention]
However, in the above-described prior art, the fitting force between the inner periphery of the cylindrical portion 105 of the first seal member 103 and the outer periphery of the second seal member 104 depends on the amount of fitting between each other.
[0006]
For this reason, there is no retaining mechanism for cases where there is no allowance due to the influence of external force or the like.
[0007]
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing device capable of preventing the assembled first and second seal members from being detached. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
Sealing the annular gap between the shaft hole of the housing and the moving shaft that is movably inserted into the shaft hole,
Comprising first and second seal members arranged side by side in the axial direction;
The first seal member is provided with a cylindrical portion extending in the axial direction toward the second seal member, and is fitted in the axial direction with the outer periphery of the second seal member provided with a metal ring on the inner periphery of the cylindrical portion. In a sealing device assembled with a fitting surface,
The outward protrusion provided on the second sealing member periphery with there by a cylindrical inner peripheral of the first seal member providing inwardly protruding the opening end side of the tubular portion than the fitting surface, the outward the outer diameter of the projection is set larger than the inner diameter of the inward projection, the tubular outward projection fitting surface of the outward protrusion in a state of incorporating the second sealing member is formed in a concave shape is fitted It is a part inner periphery, provided between the inward projection and the fitting surface, and is used for venting air in the axial direction to the fitting surface of the cylindrical portion of the first seal member and the outward projection fitting surface. A passage is formed, and the outward projection is formed at a position deviating from the portion of the metal ring fitted to the fitting surface to the opening end side and is made of a rubber-like elastic material. .
[0009]
In the present invention, when the second seal member is axially press-fitted into the inner circumference of the cylindrical portion of the first seal member, the outward projection of the second seal member becomes the inner side of the inner circumference of the cylindrical portion of the first seal member. Axial contact with the direction protrusion, and when pressed further, the contact portion between the outward protrusion and the inward protrusion elastically deforms in the radial direction, and the outward protrusion overcomes the inward protrusion and opens the cylindrical portion. Located on the opposite side of the edge .
[0010]
Therefore, in a state where the second seal member is incorporated, the outward projection interferes with the inward projection, and the second seal member is prevented from coming off.
[0011]
Furthermore, since at least one of the inward projections and outward projection is constituted by a rubber-like elastic material, the contact portion between the inward protrusions and the outward protrusions at embedded is easily elastically deformed, the embedder Easy to do.
[0012]
A taper surface for an insertion guide that gradually increases in diameter toward the distal end side is provided at an end edge on the distal end side of the tubular portion of the inward projection provided on the inner periphery of the first seal member. To do.
[0013]
In addition, an insertion guide taper surface that is gradually reduced in diameter in the insertion direction is provided on an end edge of the outward projection on the outer periphery of the second seal member in the insertion direction.
[0014]
In this way, if the insertion guide taper surface is provided on the inward projection or the outward projection, it gradually elastically deforms along the insertion guide taper surface, and the outward projection smoothly gets over the inward projection. , Improved embedding.
[0015]
Embodiment
The present invention will be described below based on the illustrated embodiments.
[0016]
1 to 3 show a sealing device according to an embodiment of the present invention.
[0017]
In the figure, reference numeral 1 denotes the whole sealing device. In general, the shaft hole 3 of the housing 2 and the moving shaft 4 inserted into the shaft hole 3 so as to be movable in the rotational direction (rotational motion) or axial direction (reciprocating motion). It seals an annular gap between them, and includes first and second seal members 10 and 20 provided side by side in the axial direction.
[0018]
The first seal member 10 is provided with an outer cylinder portion 11 as a cylindrical portion extending in the axial direction toward the second seal member 20, and the outer periphery of the second seal member 20 is fitted to the inner periphery of the outer cylinder portion 11. Are assembled.
[0019]
The first seal member 10 is an annular member having a substantially J-shaped cross section that opens to the fluid to be sealed in the axial direction. The outer cylinder portion 11 is fitted into the inner periphery of the shaft hole 3 of the housing 2, and the outer cylinder portion 11. An inward flange portion 12 extending radially inward from one axial end thereof, and a first lip portion 13 extending from the inner diameter end of the inward flange portion 12 in the same direction as the outer cylinder portion 11. . The first lip portion 13 extends in the axial direction over approximately half the length of the outer cylinder portion 11, and the lip tip 14 is in slidable sealing contact with the outer peripheral surface of the moving shaft 4. A spring member 15 for applying a tension force is mounted on the back side.
[0020]
Further, an auxiliary lip 16 is provided at the base end portion of the first lip portion 13 so as to be inclined and extend in the direction opposite to the first lip portion 13.
[0021]
The first seal member 10 is a molded product made of a rubber-like elastic material, and a first metal ring 17 having an L-shaped cross section is embedded in the outer cylinder portion 11 and the inward flange portion 12. That is, the outer cylinder portion 11 is covered with the rubber-like elastic material 18 on the inner periphery and the outer periphery of the first metal ring 17, and the both sides of the inward flange portion 12 are covered with the rubber-like elastic material 19. .
[0022]
The second seal member 20 is an annular member having an inverted L-shaped cross section, and an inner cylinder portion 21 fitted to the inner periphery of the outer cylinder portion 11 of the first seal member 10, and the first seal member 10 of the inner cylinder portion 21. from the end of the inward flange portion 1 2 and the opposite side of the inward flange portion 22 extending radially inward of, the second lip portion 23 formed in the inner diameter end of the inward flange portion 22, from It is configured.
[0023]
The second seal member 20 is also a molded product made of a rubber-like elastic material, and includes a second metal ring 24 and a rubber-like elastic material 25.
[0024]
An inward projection 5 is provided on the inner periphery of the outer cylinder portion 11 of the first seal member 20, and an outward projection 6 is provided on the outer periphery of the second seal member 20. The outer diameter φB of the outward projection 6 is set to be larger than the inner diameter φA of the inward projection 5, and the outward projection 6 is in the outer cylinder portion 11 with respect to the inward projection 5 with the second seal member 20 incorporated. It is comprised so that it may be located on the opposite side (henceforth a base end side) from an opening end .
[0025]
The inward projection 5 of the first seal member 10 is formed to protrude from the inner periphery of the distal end portion of the outer cylinder portion 11, and extends from the base end portion of the outer cylinder portion 11 excluding the inward projection 5 to the front of the inward projection 5. In the range, a metal ring fitting surface 71 into which the second metal ring 24 on the outer periphery of the second seal member 20 is fitted and an outward projection fitting surface 72 into which the outward projection 6 is fitted are formed. Yes. The inner diameter of the metal ring fitting surface 71 is substantially equal to the inner diameter φA of the inward projection 5, and the outward projection fitting surface 72 is formed in a concave shape between the metal ring fitting surface 71 and the inward projection 5. ing. The fitting between the metal ring fitting surface 71 and the second metal ring 24 needs to be an interference fit having a fitting margin, but the fitting between the outward projection fitting surface 72 and the outward projection 6 is However, the present invention is not limited to the interference fit, and may be a clearance fit having a gap as shown in the figure, or an intermediate fit.
[0026]
In consideration of the case where the negative pressure in the space between the first and second seal members 10 and 20 becomes a problem, the metal ring fitting surface 71 and the outward projection fitting surface 72 are appropriately configured with a venting passage. It provided with grooves or the like for. In the illustrated example, a groove extending in the axial direction is formed in the outward protrusion fitting surface 72 and the inward protrusion 5. The metal ring fitting surface 71, although not shown that form a suitable groove or the like.
[0027]
The inward projection 5 is formed of a rubber-like elastic material, and a conical first insertion guide taper surface 81 that gradually increases in diameter toward the distal end side is provided on the distal end side edge of the outer cylindrical portion 11. Yes. The inclination angle α with respect to the axis of the first insertion guide taper surface 81 is set to a small angle so as to facilitate press-fitting.
[0028]
Further, a conical first extraction guide that is inclined at the end of the inward projection 5 on the base end side of the outer tube portion 11 so as to gradually increase in diameter toward the base end portion in the axial direction of the outer tube portion 11. A tapered surface 91 is formed. The angle β of the extraction guide taper surface 91 is set to be larger than the inclination angle α of the first insertion guide taper surface 81 so that it is difficult to separate.
[0029]
The outward projection 6 on the outer periphery of the second seal member 20 is provided on the outer periphery of the rear end portion in the insertion direction of the inner cylinder portion 21 of the second seal member 20, and the rear end portion 21 a is the rear end of the second metal ring 24. Further, it extends rearward and is composed only of a rubber-like elastic material. A second insertion guide taper surface 82 that is gradually reduced in diameter in the insertion direction is provided on the end edge of the outward projection 6 on the distal side in the insertion direction. The inclination angle α ′ of the second insertion guide taper surface 82 is set to be approximately the same as the inclination angle α of the first insertion guide taper surface 81 provided on the inward projection 5 on the inner periphery of the first seal member 10. ing.
[0030]
Further, a second extraction guide taper surface 92 that is inclined so as to be gradually reduced in diameter in the extraction direction is provided at the end edge of the outward protrusion 6 on the front end side (rear end side in the insertion direction). ing. The inclination angle of the second extraction guide taper surface 92 is set to be approximately the same as that of the first extraction guide taper surface 91, and is not easily detached.
[0031]
In the present invention, when the second seal member 20 is press-fitted axially into the inner periphery of the outer cylinder portion 11 of the first seal member 10, the outward projection 6 of the second seal member 20 is the first seal member 10. Of the outer cylindrical portion 11 is in axial contact with the inward projection 5 on the inner periphery of the outer cylindrical portion 11, and when pressed further, the abutting portion of the outward projection 6 and the inward projection 5 is elastically deformed in the radial direction so that the outward projection 6 climbs over the inward projection 5 and is located on the proximal end side of the outer cylinder portion 11.
[0032]
Therefore, in the state in which the second seal member 20 is incorporated, the outward projection 6 interferes with the inward projection 5 to prevent the second seal member 20 from coming off.
[0033]
If at least one of the inward projection 5 and the outward projection 6 is made of a rubber-like elastic material, the abutting portion between the inward projection 5 and the outward projection 6 is easily elastically deformed during assembling. Can be easily done.
[0034]
Further, since the inward projection 5 and the outward projection 6 are provided with the first and second insertion guide taper surfaces 81 and 82, gradually along the first and second insertion guide taper surfaces 81 and 82. Since the outward projection 6 smoothly gets over the inward projection 5, the assemblability is improved.
[0035]
[Embodiment 2]
FIG. 2 shows a second embodiment of the present invention.
[0036]
The sealing device 201 according to the second embodiment also seals the annular gap between the shaft hole 203 of the housing 202 and the moving shaft 204 that is movably inserted into the shaft hole 203, and is provided side by side in the axial direction. The first and second seal members 210 and 220 are provided.
[0037]
The first seal member 210 is provided with an outer cylinder portion 211 as a cylindrical portion extending in the axial direction toward the second seal member 220, and the outer periphery of the second seal member 220 is formed on the inner periphery of the outer cylinder portion 211. It is assembled by fitting in the axial direction.
[0038]
The first seal member 210 is an annular member having a substantially S-shaped cross section. The outer cylinder portion 211 is fitted into the inner periphery of the shaft hole 203 of the housing 202, and is radially inward from one axial end of the outer cylinder portion 211. And an inward flange portion 212 extending in the direction of the inner flange, and a first lip portion 213 extending from the inner diameter end of the inward flange portion 212 in the direction opposite to the outer tube portion 211. An engagement flange portion 211 a that is engaged with the peripheral edge of the shaft hole 203 of the housing 202 is provided at the distal end portion of the outer cylinder portion 211.
[0039]
Further, the inner diameter end portion of the inward flange portion 212 has a stepped shape that is bent toward the second seal member 220, and a first lip portion 213 is provided at the tip of the bent portion 212a. The first lip portion 213 extends to the same position as the end surface of the inward flange portion 212 on the side opposite to the second seal member 220 and is in slidable sealing contact with the outer peripheral surface of the moving shaft 204. A spring member 215 for applying a tightening force is attached to the back side of the lip tip 214.
[0040]
In addition, an auxiliary lip 216 extending at an angle in the direction opposite to the first lip 213 is provided at the base end of the first lip 213.
[0041]
The first seal member 210 is a molded product made of rubber-like elastic material, and a first metal ring 217 is embedded in the engagement flange portion 211a, the outer cylinder portion 211, the inward flange portion 212, and the bent portion 212a. That is, the outer cylinder portion 211 is covered with the rubber-like elastic material 218 on the inner periphery and the outer periphery of the first metal ring 217, and the both sides of the inward flange portion 212 are covered with the rubber-like elastic material 219. .
[0042]
The second seal member 220 is an annular member having a Z-shaped cross section, and an inner cylinder portion 221 fitted to the inner periphery of the outer cylinder portion 211 of the first seal member 210, and the first seal member 210 of the inner cylinder portion 221. The inward flange portion 222 extends radially inward from the end opposite to the inward flange portion 212, and a second lip portion 223 provided at the inner diameter end of the inward flange portion 222. Yes. The second lip portion 223 extends in the direction opposite to the first lip portion 213 of the first seal member 210.
[0043]
The inner diameter end portion of the inward flange portion 222 has a stepped shape that bends toward the inward flange portion 212 side of the first seal member 210, and the first seal member 210 has a first shape at the inner diameter end of the bent portion 222 a. A second lip portion 223 is provided in the direction opposite to the axial direction of the lip portion 213 .
[0044]
The second seal member 220 is also composed of a second metal ring 224 and a rubber-like elastic material 225, and has a fitting surface that fits on the inner periphery of the outer cylinder portion 211 of the first seal member 210 of the inner cylinder portion. The second metal ring 224 is exposed.
[0045]
The bent portion 222 a of the second seal member 220 has the bent portion 212 a of the first seal member 210 and the back face of each other, and the inward flange portion 212 is between the first seal member 210 and the second seal member 220. , 222 and a second annular space 231 formed between the first and second lip portions 213 and 223 are partitioned.
[0046]
The rear of the bent portion 212a of the first seal member 210, the side lip 232 which is formed by a rubber-like elastic material open to gradually enlarged toward the second seal member 22 0 side is provided, when being installed In addition, the side lip 232 is deformed to come into close contact with the back surface of the bent portion 222a of the second seal member 220. It is provided with some notches 232a in the side lip 23 2. An air vent groove 233 communicating with the first and second annular spaces 230 and 231 is provided on the back surface of the bent portion 222a of the second seal member 220 with which the side lip 232 is in close contact.
[0047]
An inward projection 205 is provided on the inner periphery of the outer cylindrical portion 211 of the first seal member 220, and an outward projection 206 is provided on the outer periphery of the second seal member 220. An outer diameter φB of the outward projection 206 is set to be larger than an inner diameter φA of the inward projection 205, and the outward projection 206 is in the outer cylindrical portion 211 with respect to the inward projection 205 in a state where the second seal member 220 is incorporated. It is comprised so that it may be located in the base end side.
[0048]
The inward projection 205 of the first seal member 210 is formed to protrude from the inner periphery of the distal end portion of the outer cylinder portion 211, and extends from the base end portion of the outer cylinder portion 211 excluding the inward projection 205 to the front of the inward projection 205. In the range, a metal ring fitting surface 271 to which the second metal ring 224 on the outer periphery of the second seal member 220 is fitted and an outward projection fitting surface 272 to which the outward projection 206 is fitted are formed. Yes. The inner diameter of the metal ring fitting surface 271 is substantially equal to the inner diameter φA of the inward projection 205, and the outward projection fitting surface 272 is formed in a concave shape between the metal ring fitting surface 271 and the inward projection 205. ing.
[0049]
Then, the metal ring fitting surface 271 notches 27 1 a of the air vent is in the inward projection 205 and the outward protrusion mating surface 272 groove 205a for come air disconnect is formed.
[0050]
The inward projection 205 is formed of a rubber-like elastic material, and a conical first insertion guide taper surface 281 that gradually increases in diameter toward the distal end side is provided on the distal end side edge of the outer cylindrical portion 211. Yes. The inclination angle α with respect to the axis of the first insertion guide taper surface 281 is set to a small angle so as to facilitate press-fitting.
[0051]
Further, a conical first extraction guide that inclines so as to gradually increase in diameter toward the axial base end of the outer tube portion 211 at the end of the inward projection 205 on the base end side of the outer tube portion 211. A tapered surface 291 is formed. The angle β of the extraction guide taper surface 291 is set to be larger than the inclination angle α of the first insertion guide taper surface 281 so that it is difficult to separate.
[0052]
The outward projection 206 on the outer periphery of the second seal member 220 is provided on the outer periphery of the rear end portion in the insertion direction of the inner cylinder portion 221 of the second seal member 220, and the rear end portion 221 a is the rear end of the second metal ring 224. It extends in the shape of an eaves to the rear, and is composed only of rubber-like elastic material. A second insertion guide taper surface 282 that gradually decreases in diameter in the insertion direction is provided on the end edge of the outward protrusion 206 in the insertion direction. The inclination angle α ′ of the second insertion guide taper surface 282 is set to be approximately the same as the inclination angle α of the first insertion guide taper surface 81 provided on the inward projection 205 on the inner periphery of the first seal member 210. ing.
[0053]
Further, a second extraction guide taper surface 292 that is inclined so as to be gradually reduced in diameter in the extraction direction is provided at the edge of the outward projection 206 on the front end side in the extraction direction (rear end side in the insertion direction). ing. The inclination angle of the second extraction guide taper surface 292 is set to be approximately the same as that of the first extraction guide taper surface 291, so that it is difficult to be detached.
[0054]
In the present invention, when the second seal member 220 is press-fitted in the axial direction into the inner periphery of the outer cylindrical portion 211 of the first seal member 210, the outward projection 6 of the second seal member 220 becomes the first seal member 210. Of the outer cylindrical portion 211 is in axial contact with the inward projection 205 on the inner periphery, and when pressed further, the contact portion between the outward projection 206 and the inward projection 205 is elastically deformed in the radial direction, and the outward projection 206 gets over the inward projection 205 and fits to the outward projection fitting surface 272 of the outer cylindrical portion 211.
[0055]
Therefore, in the state in which the second seal member 220 is incorporated, the outward projection 206 interferes with the inward projection 205 to prevent the second seal member 220 from coming off.
[0056]
If at least one of the inward projection 205 and the outward projection 206 is made of a rubber-like elastic material, the abutting portion between the inward projection 205 and the outward projection 206 is easily elastically deformed during assembling. Can be easily done. In particular, in this embodiment, the rear end portion 221a of the inner cylinder portion 221 is formed of only a rubber-like elastic material and protrudes like a cantilever, so that the assembling work is further simplified.
[0057]
In addition, since the inward projection 205 and the outward projection 206 are provided with the first and second insertion guide taper surfaces 281 and 282, gradually along the first and second insertion guide taper surfaces 281 and 282. Since the outward projection 206 smoothly gets over the inward projection 205, the assemblability is improved.
[0058]
On the other hand, the bent portion 222a of the inward flange portion 222 of the second seal member 220 presses the side lip 232 provided on the bent portion 212a of the inward flange portion 212 of the first seal member 210, and the bent portions 222a and 212a. They are in close contact with each other via the side lip 232.
[0059]
Further, the negative pressure in the second annular space between the first and second lip portions is eliminated through the groove between the bent portions, the first annular space, the notch and the groove.
[0060]
[Test results]
Next, the result of having manufactured the sample S as shown in FIG. 3 and testing the fitting state will be described. The sample S is obtained by cutting the bent portion of the inward flange portion of the first seal member 210 in the second embodiment.
[0061]
-Drop Test-In the test, first, the second seal member 220 is press-fitted into the first seal member 210, and the amount of inclination of the second seal member 220 is measured.
[0062]
Then, it dropped from the height of 50,100,150 [cm], and the amount of inclination of the 2nd seal member 220 was measured.
[0063]
—Measurement of Detachment Force (Separation Test) — Furthermore, as shown in FIG. 3, a removal jig 300 was applied to the back surface of the bent portion of the inward flange portion of the second seal member 220 to measure the detachment force. The separation speed was 20 [mm / sec], and the sample S was compared between a regular product before the drop test, a sample after the drop test, and a conventional product.
[0064]
The test results are shown in Table 1, and the comparison of the release force is shown in FIG.
[0065]
The amount of inclination of the second seal member 220 is determined by applying a dial gauge to the position a of the second seal member 220 and rotating the whole to read the difference between the maximum value and the minimum value. The fitting state of the first and second seal members 210 and 220 is confirmed by the amount of inclination. The drop test was dropped in the same direction as the detachment test, that is, with the second seal member 220 facing down.
[0066]
[Table 1]

As shown in Table 1 and FIG . It can be seen that there is no significant difference in the amount of inclination before and after the drop test of 3 to 8 and there is almost no difference in the separation load (220 to 235 [kgf] before dropping, 208 to 270 [kgf] after dropping).
[0067]
On the other hand, in the conventional type (Nos. 101 to 106) in which no protrusion is provided, the inclination amount after the drop test is as large as 0.56 to 2.54 [mm], and some of them are detached. Further, the separation load is extremely reduced to 30 to 90 [kgf], and it can be seen that the fitting state is stabilized by providing the inward and outward protrusions as in the present invention. For the conventional product, the inclination amount and the separation load in the normal state are set to be equivalent to those in the normal state of the sample of the present invention.
[0068]
【The invention's effect】
As described above, in the present invention, the inward projection is provided on the inner periphery of the cylindrical portion of the first seal member, the outward projection is provided on the outer periphery of the second seal member, and the outer diameter of the outward projection is inward. Since the outward protrusion is positioned on the side opposite to the opening end of the tubular portion with respect to the inward protrusion, the outward protrusion is inward, with the inner diameter of the protrusion set larger than the inner diameter of the protrusion. The second seal member can be prevented from coming off by interfering with the protrusion.
[0069]
Furthermore, since at least one of the inward projections and outward projection is constituted by a rubber-like elastic material, the contact portion between the inward protrusions and the outward protrusions at embedded is easily elastically deformed, the embedder Easy to do.
[0070]
Further, by providing an insertion guide taper surface on the end edge on the distal end side of the cylindrical portion of the inward projection of the first seal member or on the end edge side in the insertion direction of the outward projection of the second seal member, the assembling work can be performed. It becomes easier.
[Brief description of the drawings]
FIG. 1 (a) is a cross-sectional view of an essential part of a sealing device according to Embodiment 1 of the present invention, and FIG. 1 (b) is an enlarged cross-sectional view of a fitting portion in FIG. 1 (a).
FIG. 2 (a) is a cross-sectional view of an essential part of a sealing device according to Embodiment 2 of the present invention, and FIG. 2 (b) is a diagram showing a state in which the second seal member in FIG. 2 (a) is removed. FIG. 7C is a partial cross-sectional view of the first seal member 210 and is a partial arrow view in the C direction of FIG.
FIG. 3 is a view showing a test method of a fitting state of the sealing device of FIG. 2;
FIG. 4 is a graph showing a relationship between an inclination amount and a detachment force of the second seal member of the present invention and a conventional example.
FIG. 5 is a cross-sectional view of a main part of various conventional sealing devices.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,201 Sealing device 2,202 Housing 3,203 Shaft hole 4,204 Moving shaft 10,210 First seal member 11,211 Outer cylinder part (cylindrical part)
211a Engaging flange portion 12, 212 Inward flange portion 212a Bent portion 13, 213 First lip portion 14, 214 Lip tip 15, 215 Spring member 16, 216 Auxiliary lip 17, 217 First metal ring 18, 218 Rubber elasticity Material 19,219 Rubber elastic material 20,220 Second seal member 21,221 Inner tube portion 21a, 221a Rear end portion 22,222 Inward flange portion 222a Bending portion 23,223 Second lip portion 24,224 Second metal Ring 25,225 Rubber elastic material 5,205 Inward projection 6,206 Outward projection 71,271 Metal ring fitting surface 72,272 Outward projection fitting surface 81,82,281,282 First, second insertion Tapered surfaces for guides 91, 92, 291, 292 First and second extraction tapered surfaces 230, 231 First and second rings Space 232 Side lip 232a Notch 233 Groove

Claims (4)

ハウジングの軸孔と該軸孔内に移動自在に挿入される移動軸間の環状隙間をシールするもので、
軸方向に並べて設けられる第１および第２シール部材を備え、
前記第１シール部材に前記第２シール部材側に向かって軸方向に延びる筒状部を設け、該筒状部内周には金属環を備えた前記第２シール部材外周と軸方向に嵌合する嵌合面を設けて組み付けた密封装置において、
前記第１シール部材の筒状部内周であって前記嵌合面よりも前記筒状部の開口端側に内向き突起を設けると共に前記第２シール部材外周に外向き突起を設け、前記外向き突起の外径を前記内向き突起の内径よりも大きく設定し、凹状に形成され前記第２シール部材を組み込んだ状態で前記外向き突起が嵌合される外向き突起嵌合面を前記筒状部内周であって前記内向き突起と前記嵌合面との間に設け、前記第１シール部材の筒状部の嵌合面及び前記外向き突起嵌合面には軸方向に通じる空気抜き用の通路が形成され、前記外向き突起は前記金属環の前記嵌合面に嵌合する部分より前記開口端側へはずれた位置に形成されると共にゴム状弾性材によって構成されたことを特徴とする密封装置。Sealing the annular gap between the shaft hole of the housing and the moving shaft that is movably inserted into the shaft hole,
Comprising first and second seal members arranged side by side in the axial direction;
The first seal member is provided with a cylindrical portion extending in the axial direction toward the second seal member, and is fitted in the axial direction with the outer periphery of the second seal member provided with a metal ring on the inner periphery of the cylindrical portion. In a sealing device assembled with a fitting surface,
The outward protrusion provided on the second sealing member periphery with there by a cylindrical inner peripheral of the first seal member providing inwardly protruding the opening end side of the tubular portion than the fitting surface, the outward the outer diameter of the projection is set larger than the inner diameter of the inward projection, the tubular outward projection fitting surface of the outward protrusion in a state of incorporating the second sealing member is formed in a concave shape is fitted It is a part inner periphery, provided between the inward projection and the fitting surface, and is used for venting air in the axial direction to the fitting surface of the cylindrical portion of the first seal member and the outward projection fitting surface. A passage is formed, and the outward projection is formed at a position deviating from the portion of the metal ring fitted to the fitting surface to the opening end side and is made of a rubber-like elastic material. Sealing device. 第１シール部材の筒状部内周に設けられる内向き突起の筒状部先端側の端縁には先端側に向かって徐々に拡径する挿入ガイド用テーパ面が設けられている請求項１に記載の密封装置。  The insertion guide taper surface that gradually increases in diameter toward the distal end side is provided at an end edge of the cylindrical portion distal end side of the inward projection provided on the inner periphery of the first seal member. The sealing device as described. 第２シール部材外周の外向き突起の挿入方向先端側の端縁に挿入方向に向かって徐々に縮径される挿入ガイド用テーパ面が設けられている請求項１又は２に記載の密封装置。  3. The sealing device according to claim 1, wherein an insertion guide taper surface that is gradually reduced in diameter in the insertion direction is provided at an end edge on the distal end side in the insertion direction of the outward projection on the outer periphery of the second seal member. 前記筒状部内周の前記嵌合面の内径は、前記内向き突起の内径に略等しいことを特徴とする請求項１〜３のいずれかに記載の密封装置。The sealing device according to claim 1, wherein an inner diameter of the fitting surface on the inner periphery of the cylindrical portion is substantially equal to an inner diameter of the inward projection.

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