JP4052882B2

JP4052882B2 - Connection structure between thin metal pipe and flexible hose

Info

Publication number: JP4052882B2
Application number: JP2002170147A
Authority: JP
Inventors: 治雄西原; 保司坂本; 一儀滝川
Original assignee: Usui Co Ltd
Current assignee: Usui Co Ltd
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2008-02-27
Anticipated expiration: 2022-06-11
Also published as: JP2004011877A

Description

【０００１】
【産業上の利用分野】
本発明は、自動車、一般産業用機械等に於いて、ガソリン、軽油等の液体燃料、プロパン、天然ガス等の気体燃料、圧縮エアー、オイル、負圧等を目的部に供給するための供給路として配設される比較的細径の細径金属管と、樹脂、ゴム等で形成した可撓ホースとの接続構造に係るものである。
【０００２】
【従来の技術】
従来、自動車、一般産業用機械等に於いて、ガソリン、軽油等の液体燃料、プロパン、天然ガス等の気体燃料、圧縮エアー、オイル、負圧等を目的部に供給するための外径２０mm以下の比較的細径の金属管と、樹脂、ゴム等で形成した可撓ホースとの接続構造として、特開平９−１２６３７４号公報記載の発明、特許第２６７３４１８号公報記載の発明等が存在する。これらの従来発明では、細径金属管または細径金属管に接続するコネクタの外周に、テーパー状のブッシュ部材を接続するとともに、このブッシュ部材に隣接して、スプール加工により環状膨出部を突設している。この環状膨出部とブッシュ部材とで構成される装着凹部に、可撓ホースの内周面に弾性的に密着するシールリング部材を挿入配置する事により、細径金属管と可撓ホースとの気密性を保とうとしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、この従来の接続構造では、ブッシュ部材と環状膨出部とで構成するシールリング部材の装着凹部の形状や形成幅にばらつきを生じ易かった。また、ブッシュ部材の成形に、高精度なインジェクションモールディングや圧造、切削等の手間や材料費が掛かるとともに、細径金属管にブッシュ部材を組み付ける手間も掛かり、生産性を低下させていた。
【０００４】
また、特開平９−１００９５９号公報記載の他の異なる従来発明では、可撓ホースの内周面に、ゴム又は樹脂を塗布して固着層を設けている。そして、可撓ホース内に細径金属管等を挿入接続した際に、この粘着性の高い固着層を細径金属管の外周に密着させる事により、細径金属管と可撓ホースとの気密性を保とうとしていた。しかしながら、ゴムや樹脂を溶剤に溶解して可撓ホースに塗布するため、溶剤の乾燥が不十分な状態で細径金属管を挿入すると、細径金属管によって可撓ホースの内周面から固着層が擦り取られ気密性を損なったり、過度に乾燥すると、十分な気密性が得られない可能性があった。そのため、高い品質を維持するには、固着層を適度に乾燥して安定させてから可撓ホースと細径金属管との接続作業を行う必要があり、ポットライフの管理が煩わしく非効率的な作業であった。また、溶剤を使用するため、作業者の健康を害したり、環境にも悪影響を及ぼす危険性もあった。
【０００５】
本発明は上述の如き課題を解決しようとするものであって、車輌、船、建設機械等、各種機械装置、特に自動車に於いて、燃料のメイン配管、リターン配管、エバポ配管、バキューム配管、オイル配管、その他の比較的細径の細径金属管と可撓ホースとの接続構造に於いて、信頼性の高い気密性を得る事を可能とするものである。また、この気密性の高い接続構造を、容易な製造方法で多くの部材を使用せずに実現するとともに、気密性を長期に持続可能な耐久性に優れたものとする。
【０００６】
【課題を解決するための手段】
本発明は上述の如き課題を解決するため、可撓ホース内に細径金属管を挿入接続する接続構造に於いて、可撓ホース内に挿入される細径金属管の挿入側の先端部方向の外周に、環状突出壁を設け、この環状突出壁の挿入側面の基部外周に、シールリング部材を、可撓ホースの内周面と密着可能に装着して成るものである。
【０００７】
また、細径金属管は、環状突出壁を介して挿入側の先端部方向とは反対側の後端部方向の外周面に、樹脂チューブを密着配置しても良い。
【０００８】
また、細径金属管は、環状突出壁の基部に配置したシールリング部材と挿入側の先端部との間に、樹脂チューブを密着配置しても良い。
【０００９】
また、シールリング部材は、細径金属管と接触する内周面に、細径金属管の挿入側の先端部方向に突出する少なくとも一つの足部を設けた異形断面足付きシールリング部材とし、この足部の外表面及び細径金属管の先端部方向の外周面に、樹脂チューブを密着配置し、シールリング部材の足部を細径金属管の外周面に固定しても良い。
【００１０】
また、細径金属管は、樹脂チューブを配置する外周面の環状突出壁よりも後端部方向に、環状膨出部を設けても良い。
【００１１】
また、シールリング部材は、断面三角形状としても良い。
【００１２】
また、樹脂チューブは、細径金属管と接触する内周面に接着剤を塗布するか又は熱収縮により、細径金属管の外周面に密着させても良い。
【００１３】
また、シールリング部材を配置する環状突出壁は、挿入側面と細径金属管の外周面とで挟む挟角が鋭角となるよう、挿入側面を先端部方向に傾斜させても良い。
【００１４】
【作用】
本発明は上述の如く構成したものであるから、車輌、船、建設機械等、各種機械装置、特に自動車に於いて、燃料のメイン配管、リターン配管、エバポ配管、バキューム配管、オイル配管、その他の比較的細径の金属管を、ゴム、樹脂製の可撓ホースと接続するには、まず細径金属管の可撓ホースへの挿入側の先端部方向の外周に、バルジ加工、スプール加工等により環状突出壁を設ける。そして、この環状突出壁の挿入側の挿入側面の基部外周に、可撓ホースの内周面に密着させるためのシールリング部材を装着する。尚、本明細書中では、可撓ホースへの挿入側の先端を、先端部方向とし、この先端部方向に対して反対側を、後端部方向とする。
【００１５】
次に、このシールリング部材を装着した細径金属管を可撓ホース内に挿入し、可撓ホースを細径金属管の後端部方向に押し込んで、細径金属管を可撓ホース内に一定長さを挿入させる事により、細径金属管と可撓ホースとを接続する。この可撓ホース内への細径金属管の挿入時には、可撓ホースの内周面がシールリング部材を押圧しながら後端部方向に摺動するので、シールリング部材には、後端部方向へ移動させようとする可撓ホースからの押圧力が作用する。しかし、シールリング部材は、後端部方向の背面を環状突出壁に突き当てているので、シールリング部材が環状突出壁を乗り越えて細径金属管の後端部方向に移動したり、歪みを生じにくい。従って、細径金属管と可撓ホースとの接続が完了すると、可撓ホースにより押圧変形されたシールリング部材が、可撓ホースの内周面に均一に密着するので、細径金属管と可撓ホースの接続構造に、信頼性の高い気密性が得られる。
【００１６】
また、本発明では、可撓ホースが環状突出壁に内径を拡開されているので、この拡開力に対する反作用により、環状突出壁付近では可撓ホースには、強い縮径力を生じる。この縮径力により、可撓ホースが細径金属管の外周面を強く締め付け、可撓ホースと細径金属管との耐引き抜け力が高まる。更に、可撓ホースの縮径力及びシールリング部材の弾性力との相乗効果で、可撓ホースの内周面へのシールリング部材の密着性が高まり、優れた気密性を得る事ができる。
【００１７】
また、前記特開平９−１２６３７４号公報記載の発明、特許第２６７３４１８号公報記載の発明では、細径金属管と可撓ホースとの接続にブッシュ部材等の部品を必要とし、部品製作や組み付けの手間が増え、コスト高となる虞があった。しかし、本発明では、環状突出壁の基部にシールリング部材を装着し、細径金属管を可撓ホース内に挿入するだけで、気密性に優れた接続が可能となり、細径金属管と可撓ホースとの接続構造を、少ない部品と単純な構造で、廉価に実現する事ができる。
【００１８】
また、特開平９−１００９５９号とは異なり、本発明では溶剤等を全く使用しないので、作業環境への悪影響も防ぐとともに、煩わしく非効率的な乾燥作業や管理の手間がなく、可撓ホースと細径金属管との接続作業を短時間で効率的に行う事ができる。
【００１９】
また、細径金属管は、環状突出壁を介して挿入側の先端部とは反対側の後端部方向の外周に、樹脂チューブを密着配置しても良い。この樹脂チューブが可撓ホースと細径金属管との間に介在する事により、可撓ホースの内径が拡開され、その反作用による可撓ホースの縮径力が高まり、可撓ホースが細径金属管をより強い力で締付けるので、細径金属管と可撓ホースとの耐引き抜け力が向上する。また、樹脂チューブを使用する事により、部品点数は増えるが、長尺なチューブを切断して細径金属管に装着するだけの簡単な作業であり、従来のブッシュ部材の如き製作の手間を必要とする事はないし、材料も廉価であるから、生産性に影響を及ぼす事はない。
【００２０】
また、細径金属管は、環状突出壁の基部に配置したシールリング部材と挿入側の先端部との間に、樹脂チューブを密着配置すれば、細径金属管の先端部方向での可撓ホースの縮径力が高まり、この先端部方向の外周面を可撓ホースが強く締付けて、細径金属管と可撓ホースとの耐引き抜け力を向上させる事ができる。
【００２１】
また、シールリング部材は、細径金属管と接触する内周面に、細径金属管の挿入側の先端部方向に突出する少なくとも一つの足部を設けた異形断面足付きシールリング部材とし、この足部の外表面及び細径金属管の先端部方向の外周面に、樹脂チューブを密着配置し、シールリング部材の足部を細径金属管の外周面に固定すれば、シールリング部材の位置ズレや過度の歪みの防止効果が高まり、可撓ホースの内周面にシールリング部材が均一に密着して、細径金属管と可撓ホースとの接続構造に、信頼性の高い気密性を得る事ができる。前記足部を設ける際には、シールリング部材に環状の足部を一つ設けても良いし、シールリング部材に小片状の足部を、一定間隔で円周状に複数個配置しても良い。
【００２２】
また、上記樹脂チューブを細径金属管の外周面に配置する場合は、環状突出壁よりも後端部方向に配置する場合でも、環状突出壁よりも先端部方向に配置する場合でも、シールリング部材の足部を細径金属管の外周面に固定する場合であっても、樹脂チューブを配置する細径金属管の外周面の環状突出壁よりも後端部方向に、スプール加工、バルジ加工等により環状膨出部を設けても良い。このように環状膨出部を設けて樹脂チューブを配置する事により、環状膨出部と樹脂チューブとの相乗効果で、可撓ホースの内径が大きく拡開され、その反作用による縮径力が高まる。従って、環状膨出部位置での可撓ホースによる細径金属管の締め付け力が更に強くなり、細径金属管と可撓ホースとの耐引き抜け力を更に向上させる事ができる。
【００２３】
また、シールリング部材は、可撓ホースの内周面との当接部付近の断面形状が円形状又は楕円形状のものでも良いが、シールリング部材が密着する可撓ホースは、環状突出壁の形成部と非形成部の外周面との間で、テーパー状に配置される。そのため、可撓ホースのテーパー状の内周面にシールリング部材の外周面が広い面積で確実に密着可能となるように、シールリング部材を断面三角形状に形成すれば、信頼性の高い気密性が得られるとともに、シールリング部材に使用する材料を減らす事ができる。尚、本発明で言う断面三角形状のシールリング部材とは、三つの角部と直線的な三辺を有するいわゆる三角形であるのは勿論、角部を丸めたり、曲線的な辺を有するオムスビ型、水滴型等のような、ほぼ三角形に近い形状も含むものである。
【００２４】
また、樹脂チューブは、細径金属管と接触する内周面に接着剤を塗布するか又は熱収縮により細径金属管の外周面に密着させれば、細径金属管との接着性が高まるので、引き抜け力が作用しても、細径金属管から樹脂チューブが分離しにくくなり、細径金属管と可撓ホースとの耐引き抜け力の信頼性を高める事ができる。
【００２５】
また、シールリング部材を配置する環状突出壁は、挿入側面と細径金属管の外周面とで挟む挟角が鋭角となるよう、挿入側面を先端部方向に傾斜させて細径金属管を形成すれば、この挿入側面と細径金属管の外周面とでシールリング部材が挟持固定される。そのため、細径金属管への可撓ホースの装着時のシールリング部材の位置ズレ防止効果や、環状突出壁の乗り越え防止効果が向上する。
【００２６】
【実施例】
以下、本発明を自動車の流体供給機構に実施した一例を図面に於て説明すれば、(１)は細径金属管で、アンダーフロアパネル、前面パネル等に配設し、燃料タンクからエンジンルームへ燃料を供給するフューエルメイン配管、エンジンからの余剰燃料を燃料タンクへ戻すフューエルリターン配管、燃料タンク内の燃料の蒸気をエンジンルーム内のキャニスターに吸着させるためのエバポ配管、吸気の負圧を利用するバキューム配管、オイル配管等、比較的細径のものである。そして、図１に示す如く、これら複数の細径金属管(１)をゴム、樹脂製の可撓ホース(２)で連結し、燃料その他を流通している。この細径金属管(１)と可撓ホース(２)との接続構造の気密性を保つとともに、接続作業を行い易くするため、本発明では、シールリング部材(３)を細径金属管(１)に装着し、この細径金属管(１)を下記に示す如き構造としている。
【００２７】
まず、図１、図２に示す第１実施例では、細径金属管(１)は、外面平滑な素管(４)を使用し、可撓ホース(２)に挿入する先端部方向の外周に、スプール加工により環状突出壁(７)を設けている。この環状突出壁(７)は、細径金属管(１)対して垂直に突出する挿入側面(５)及び後端側面(６)を有している。また、細径金属管(１)は、この環状突出壁(７)と一定の間隔を介して後端部方向に、スプール加工により、環状膨出部(８)を突設している。
【００２８】
また、上記環状突出壁(７)は、管軸に垂直で極めて面粗度が高く、真っ平らな成形工具で高い面圧で加工する事により、高精度で面粗さが良好なシール面が得られ、環状突出壁(７)の外周面が可撓ホース(２)の内周面に、信頼性の高い気密性で密着するものとなる。そして、上記の如く構成した細径金属管(１)に於いて、前記環状突出壁(７)の、挿入側面(５)の基部外周に、該環状突出壁(７)よりも外径をやや径小とし可撓ホース(２)の内周面との当接部付近の断面形状が円形状又は楕円形状のシールリング部材(３)を、可撓ホース(２)内周面に密着可能に装着している。
【００２９】
また、シールリング部材(３)は、前述の如く高精度な環状突出壁(７)の挿入側面(５)に当接させて配置しているので、シールリング部材(３)の位置ズレや過度の歪みの防止効果が高い。更に、このシールリング部材(３)を、環状突出壁(７)よりも外径をやや径小としているので、細径金属管(１)を可撓ホース(２)に挿入する際に可撓ホース(２)の内周面が後端部方向にシールリング部材(３)を押圧しても、シールリング部材(３)が環状突出壁(７)を乗り越えて、後端部方向に移動しにくいものとなる。また、シールリング部材(３)を径小に形成しても、後述の如く、シールリング部材(３)は可撓ホース(２)の内周面への密着性が高く、信頼性の高い気密性を得る事ができる。
【００３０】
上述の如き細径金属管(１)と可撓ホース(２)とを接続するには、図１に示す如く、細径金属管(１)の先端を可撓ホース(２)に挿入し、細径金属管(１)の後端部方向に可撓ホース(２)を押し込む。この押し込み作業の際に、可撓ホース(２)の内周面が、シールリング部材(３)を径方向に押圧して変形させるとともに、後端部方向にシールリング部材(３)を移動させようとする。しかし、前述の如く、シールリング部材(３)を高精度な環状突出壁(７)の挿入側面(５)に配置し、環状突出壁(７)よりも径小としているので、シールリング部材(３)の位置ズレや過度の歪みが防止可能となるとともに、可撓ホース(２)と細径金属管(１)との円滑な接続作業が可能となる。
【００３１】
この接続作業の完了により、可撓ホース(２)内周面に押圧されて弾性変形したシールリング部材(３)が、その反力による復元力で、可撓ホース(２)の内周面に弾性的に密着する。尚、可撓ホース(２)は、環状突出壁(７)を設けた細径金属管(１)に装着する事により、この環状突出壁(７)にて内周面を拡開され、図１に示す如く、テーパー部(９)が形成される。従って、この可撓ホース(２)のテーパー部(９)の内周面に、環状突出壁(７)の外径よりも径小としたシールリング部材(３)が確実に密着するものとなる。また、環状突出壁(７)に内径を拡開される事により、その反作用として、可撓ホース(２)は、環状突出壁(７)及び環状膨出部(８)の各々の当接部に於いて強い縮径力が作用する。この強い縮径力により可撓ホース(２)が細径金属管(１)を締め付けるので、可撓ホース(２)と細径金属管(１)との耐引き抜け力が高まるものとなる。
【００３２】
また、可撓ホース(２)は、この環状突出壁(７)との当接部だけでなく、テーパー部(９)に於いても、強い縮径力が作用する。このシールリング部材(３)の外周での可撓ホース(２)の縮径力と、位置ズレや過度の歪みのないシールリング部材(３)の弾性力とにより、シールリング部材(３)が可撓ホース(２)の内周面に良好に密着するものとなり、可撓ホース(２)と細径金属管(１)との接続構造は、信頼性の高い気密性を得る事ができる。
【００３３】
また、従来技術の特開平９−１２６３７４号公報記載の発明、特許第２６７３４１８号公報記載の発明では、細径金属管と可撓ホースとの接続に、ブッシュ部材等の部品を必要とし、高精度なインジェクションモールディングや圧造、切削等の成形の手間や材料費が掛かり、コスト高となっていた。しかし、本発明では、環状突出壁(７)の基部にシールリング部材(３)を装着し、細径金属管(１)に可撓ホース(２)を押し込むだけで、接続作業が完了するとともに、信頼性の高い気密性を得る事ができ、細径金属管(１)と可撓ホース(２)との接続構造を、少ない部品と単純な構造で、廉価に実施可能となる。
【００３４】
また、特開平９−１００９５９号とは異なり、本発明では溶剤等を全く使用しないので、作業環境への悪影響も防ぐとともに、煩わしく非効率的な乾燥作業や管理の手間がなく、可撓ホース(２)と細径金属管(１)との接続作業を短時間で効率的に行う事ができる。
【００３５】
また、上記第１実施例では、細径金属管(１)に設けた環状突出壁(７)及び環状膨出部(８)により、可撓ホース(２)と細径金属管(１)との耐引き抜け力を得ている。これに対して、他の異なる第２実施例では、図３に示す如く、環状突出壁(７)の後端側面(６)の基部から環状膨出壁(８)を介して後端部方向の細径金属管(１)の外周面に、短尺な樹脂チューブ(１０)を密着配置させ、耐引き抜け力を得ようとしている。
【００３６】
この樹脂チューブ(１０)は、細径金属管(１)との接触面に、接着剤を塗布して細径金属管(１)の外周面に接着したり、熱収縮性の樹脂チューブ(１０)を細径金属管(１)の外周面に配置し熱収縮させる事で、分離不能に細径金属管(１)に密着配置させている。また、第２実施例では、細径金属管(１)の先端部方向の外周面に、シールリング部材(３)装着用の環状突出壁(７)を設け、この環状突出壁(７)と一定の間隔を介して、後端部方向に外径の径小な環状膨出部(８)を設けるとともに、細径金属管(１)の挿入側の先端部に、バルジ部(１１)を突設している。
【００３７】
このように細径金属管(１)の可撓ホース(２)との間に、樹脂チューブ(１０)を介在させる事により、この樹脂チューブ(１０)の外周面での可撓ホース(２)の縮径力が高まり、可撓ホース(２)が樹脂チューブ(１０)を介して細径金属管(１)を強く締め付けるので、細径金属管(１)と可撓ホース(２)との耐引き抜け力を更に向上させる事ができる。尚、樹脂チューブ(１０)を使用する事で、部品点数及び樹脂チューブ(１０)の装着の手間があるが、長尺な樹脂チューブ(１０)を適宜に切断して、接着剤又は熱収縮により細径金属管(１)に装着するだけなので、従来技術の如く、ブッシュ部材の成形や細径金属管への装着の如き精密な手間が掛からないし、材料も廉価であるから、生産性に影響する事はない。
【００３８】
また、第２実施例では、環状突出壁(７)の後端側面(６)の基部から、環状膨出部(８)を含む細径金属管(１)の後端部方向の外周面に樹脂チューブ(１０)を配置しているが、この樹脂チューブ(１０)は、環状膨出部(８)の外周面のみに配置しても良いし、環状突出壁(７)の基部と環状膨出部(８)との間の細径金属管(１)の外周面に配置しても良い。また、樹脂チューブ(１０)は、環状膨出部(８)よりも後端部方向の細径金属管(１)の外周面のみに配置しても良いし、環状突出壁(７)と環状膨出部(８)との間の任意の位置から環状膨出部(８)よりも後端部方向までの細径金属管(１)の外周面に配置するものであっても良い。
【００３９】
また、上記第１、第２実施例では、シールリング部材(３)を配置する環状突出壁(７)の挿入側面(５)を、細径金属管(１)に対して垂直に突設しているが、他の異なる第３実施例では、図４に示す如く、前記挿入側面(５)と細径金属管(１)の外周面との挟角が鋭角となるよう、挿入側面(５)を、細径金属管(１)の挿入側の先端部方向に傾斜させて環状突出壁(７)を突設している。そして、鋭角状に配置された前記挿入側面(５)と細径金属管(１)の外周面とでシールリング部材(３)が挟持固定されるので、細径金属管(１)への可撓ホース(２)の押し込み時に、シールリング部材(３)の位置ズレ防止効果を向上させる事ができる。そのため、可撓ホース(２)の内面へのシールリング部材(３)の均一な密着が可能となり、細径金属管(１)と可撓ホース(２)との接続構造に、信頼性の高い気密性が得られる。
【００４０】
また、上記第１〜第３実施例では、可撓ホースの内周面との当接部付近の断面系樹が円形状又は楕円形状のシールリング部材(３)を配置しているが、第４実施例では、図５に示す如く、挿入側面(５)方向の外形を径大とし、細径金属管(１)の先端部方向を径小とするテーパー面(１３)を有する断面三角形状のシールリング部材(３)を配置している。この断面三角形状とは、三つの角部と直線的な三辺を有するいわゆる三角形であるのは勿論、角部を丸めたり、曲線的な辺を有するオムスビ型、図５に示す水滴型等のような、ほぼ三角形に近い形状も含むものである。このように、三角形状としても、可撓ホース(２)は、環状突出壁(７)と先端部方向の細径金属管(１)の外周面の間でテーパー部(９)を形成するので、前記シールリング部材(３)のテーパー面(１３)が、可撓ホース(２)の内周面に確実に密着する。また、可撓ホース(２)の内周面との当接部付近の断面形状が円形状又は楕円形状のシールリング部材(３)と比べて、可撓ホース(２)の内周面との接触面積が多くなり、信頼性の高い気密性が得られるとともに、シールリング部材(３)に使用する材料を減らす事ができる。
【００４１】
また、第４実施例も、環状突出壁(７)の挿入側面(５)を、第３実施例と同様に、先端部方向に傾斜させて、挿入側面(５)と細径金属管(１)の外周面とで断面三角形状のシールリング部材(３)を挟持し、シールリング部材(３)の位置ズレ防止効果を高めている。更に、環状突出壁(７)と一定の間隔を介した後端部方向の外周に、環状膨出部(８)を突設し、可撓ホース(２)と細径金属管(１)との耐引き抜け力を高めている。
【００４２】
また、前記第２実施例では、樹脂チューブ(１０)を、環状突出壁(７)よりも後端部方向の、細径金属管(１)の外周面に配置しているが、第５実施例では、図６に示す如く、細径金属管(１)の外周面の、シールリング部材(３)に臨ませた位置から細径金属管(１)の挿入側の先端部までの間に、樹脂チューブ(１０)を密着配置している。この構成により、細径金属管(１)では、先端部方向の外周面での可撓ホース(２)の縮径力が高まり、細径金属管(１)の前記区間に於ける外周面を可撓ホース(２)が強く締め付け、耐引き抜け力が向上する。
【００４３】
また、図７に示す第６実施例では、シールリング部材(３)として、細径金属管(１)と接触する内周面に、細径金属管(１)の挿入側の先端部方向に突出する少なくとも一つの足部(１２)を設けた異形断面足付きのものを使用している。この足部(１２)は、シールリング部材(３)に環状の足部(１２)を一つのみ設けても良いし、小片状の足部(１２)を一定間隔で円周状に複数個、シールリング部材(３)に突設しても良い。そして、このシールリング部材(３)を環状突出壁(７)の挿入側面(５)の基部外周に配置し、足部(１２)の外表面から細径金属管(１)の挿入側の先端部までの間に、図７に示す如く、樹脂チューブ(１０)を密着配置し、シールリング部材(３)の足部(１２)を細径金属管(１)に固定している。
【００４４】
また、本実施例でも、シールリング部材(３)を配置する環状突出壁(７)の挿入側面(５)を、前記第３実施例と同じく先端部方向に傾斜させ、シールリング部材(３)の位置ズレ防止効果を高めても良い。そして、シールリング部材(３)の足部(１２)を固定する事により、シールリング部材(３)の位置ズレ防止効果や過度の歪み防止効果が更に高まるので、可撓ホース(２)の内周面へのシールリング部材(３)の均一な密着が可能となり、細径金属管(１)と可撓ホース(２)との接続構造は、信頼性の高い気密性を得る事ができる。また、本実施例でも、細径金属管(１)の外周に環状膨出部(８)を突設し、可撓ホース(２)と細径金属管(１)との耐引き抜け力を高めている。
【００４５】
また、図８に示す第７実施例では、シールリング部材(３)を配置する環状突出壁(７)を、細径金属管(１)の可撓ホース(２)への挿入側に於いて、やや後端部寄りに形成している。また、図９に示す第８実施例では、環状突出壁(７)を、細径金属管(１)の挿入側の先端部に近接して形成するとともに、この環状突出壁(７)の後端部方向の外周に、樹脂チューブ(１０)を長尺状に密着配置し、可撓ホース(２)による細径金属管(１)の締め付け力を高めて、可撓ホース(２)と細径金属管(１)との耐引き抜け力を向上させている。
【００４６】
【発明の効果】
本発明は上述の如く構成したもので、車輌、船、建設機械等、各種機械装置、特に自動車に於いて、燃料のメイン配管、リターン配管、エバポ配管、バキューム配管、オイル配管、その他の比較的細径の細径金属管と可撓ホースとの接続に、高い気密性を得る事ができる。また、このような信頼性の高い気密性を有する接続構造は、細径金属管の外周に環状突出壁を設け、この環状突出壁の挿入側面の基部にシールリング部材を配置しただけの単純な構造であり、接続方法も、細径金属管を可撓ホース内に挿入して、可撓ホースの内周面にシールリング部材を密着させるだけの簡単な作業で実現できる。従って、従来技術の如く、ブッシュ部材等を使用する場合に比べ、少ない部品点数と容易な製作技術で、廉価に得る事ができる。また、溶剤等を全く使用しないので、作業環境への悪影響も防ぐとともに、煩わしく非効率的な乾燥作業や管理の手間がなく、可撓ホースと細径金属管との接続作業を短時間で効率的に行う事ができる。
【図面の簡単な説明】
【図１】本発明の第１実施例の可撓ホースと細径金属管の接続構造の側面図。
【図２】第１実施例の可撓ホースと細径金属管の接続過程を示す側面図。
【図３】第２実施例の可撓ホースと細径金属管の接続構造の側面図。
【図４】第３実施例の細径金属管の側面図。
【図５】第４実施例の細径金属管の側面図。
【図６】第５実施例の細径金属管の側面図。
【図７】第６実施例の細径金属管の側面図。
【図８】第７実施例の可撓ホースと細径金属管の接続構造の側面図。
【図９】第８実施例の可撓ホースと細径金属管の接続構造の側面図。
【符号の説明】
１細径金属管
２可撓ホース
３シールリング部材
５挿入側面
７環状突出壁
８環状膨出部
１０樹脂チューブ
１２足部[0001]
[Industrial application fields]
The present invention relates to a supply path for supplying liquid fuel such as gasoline and light oil, gaseous fuel such as propane and natural gas, compressed air, oil, negative pressure and the like to a target part in automobiles, general industrial machines, and the like. The structure relates to a connection structure between a relatively small-diameter metal tube disposed as a flexible hose formed of resin, rubber, or the like.
[0002]
[Prior art]
Conventionally, in automobiles, general industrial machinery, etc., an outer diameter of 20 mm or less for supplying liquid fuel such as gasoline and light oil, gaseous fuel such as propane and natural gas, compressed air, oil, negative pressure, etc. to the target part As a connection structure between a relatively thin metal tube and a flexible hose made of resin, rubber or the like, there are an invention described in JP-A-9-126374, an invention described in Japanese Patent No. 2673418, and the like. In these conventional inventions, a tapered bush member is connected to the outer periphery of a thin metal tube or a connector connected to the thin metal tube, and an annular bulge is projected by spooling adjacent to the bush member. Has been established. By inserting and arranging a seal ring member that elastically adheres to the inner peripheral surface of the flexible hose in the mounting recess formed by the annular bulging portion and the bush member, the small metal pipe and the flexible hose Trying to keep her tight.
[0003]
[Problems to be solved by the invention]
However, in this conventional connection structure, the shape and width of the mounting recess of the seal ring member constituted by the bush member and the annular bulging portion are likely to vary. In addition, the molding of the bush member takes time and material costs for high-precision injection molding, forging, cutting, and the like, as well as the work of assembling the bush member to the small-diameter metal tube, reducing productivity.
[0004]
In another different conventional invention described in Japanese Patent Application Laid-Open No. 9-100959, rubber or resin is applied to the inner peripheral surface of the flexible hose to provide a fixing layer. Then, when a thin metal pipe or the like is inserted into and connected to the flexible hose, the tight adhesion layer having a high adhesiveness is brought into close contact with the outer periphery of the thin metal pipe so that the air tightness between the thin metal pipe and the flexible hose is achieved. I was trying to keep sex. However, since rubber and resin are dissolved in a solvent and applied to the flexible hose, if the thin metal pipe is inserted in a state where the solvent is not sufficiently dried, the thin metal pipe is fixed from the inner peripheral surface of the flexible hose. When the layer is scraped off to impair airtightness or excessively dried, there is a possibility that sufficient airtightness cannot be obtained. Therefore, in order to maintain high quality, it is necessary to connect the flexible hose and the thin metal tube after the fixing layer is properly dried and stabilized, and the pot life management is cumbersome and inefficient. It was work. In addition, since a solvent is used, there is a risk of harming the health of workers and adversely affecting the environment.
[0005]
The present invention is intended to solve the above-described problems, and is used in various mechanical devices such as vehicles, ships, construction machines, etc., especially in automobiles. Main piping of fuel, return piping, evaporation piping, vacuum piping, oil It is possible to obtain highly reliable airtightness in the connection structure between the pipe and other relatively small-diameter metal pipes and the flexible hose. In addition, this highly airtight connection structure is realized by an easy manufacturing method without using many members, and the airtightness is excellent in long-term sustainable durability.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a connection structure in which a thin metal tube is inserted and connected into a flexible hose. An annular projecting wall is provided on the outer periphery of the annular projecting wall, and a seal ring member is mounted on the outer periphery of the base of the insertion side surface of the annular projecting wall so as to be in close contact with the inner peripheral surface of the flexible hose.
[0007]
In addition, the thin metal tube may have a resin tube in close contact with the outer peripheral surface in the rear end direction opposite to the insertion end direction through an annular protruding wall.
[0008]
Further, in the small-diameter metal tube, a resin tube may be closely disposed between the seal ring member disposed at the base portion of the annular projecting wall and the distal end portion on the insertion side.
[0009]
Further, the seal ring member is a seal ring member with a deformed cross-section foot provided with at least one foot projecting in the direction of the distal end portion on the insertion side of the thin metal tube on the inner peripheral surface in contact with the thin metal tube, A resin tube may be disposed in close contact with the outer surface of the foot portion and the outer peripheral surface in the tip portion direction of the thin metal tube, and the foot portion of the seal ring member may be fixed to the outer peripheral surface of the thin metal tube.
[0010]
In addition, the thin metal pipe may be provided with an annular bulge portion in the rear end direction from the annular projecting wall on the outer peripheral surface on which the resin tube is disposed.
[0011]
The seal ring member may have a triangular cross section.
[0012]
Further, the resin tube may be brought into close contact with the outer peripheral surface of the small-diameter metal tube by applying an adhesive to the inner peripheral surface in contact with the small-diameter metal tube or by thermal contraction.
[0013]
Further, the annular protruding wall on which the seal ring member is arranged may be inclined toward the distal end portion so that the included angle between the insertion side surface and the outer peripheral surface of the thin metal tube becomes an acute angle.
[0014]
[Action]
Since the present invention is configured as described above, in various mechanical devices such as vehicles, ships, construction machines, etc., particularly in automobiles, fuel main piping, return piping, evaporation piping, vacuum piping, oil piping, etc. To connect a relatively thin metal tube to a flexible hose made of rubber or resin, first, bulge processing, spool processing, etc. on the outer periphery of the thin metal tube in the direction of the distal end on the insertion side of the flexible hose To provide an annular protruding wall. And the seal ring member for making it closely_contact | adhere to the inner peripheral surface of a flexible hose is attached to the base part outer periphery of the insertion side of this insertion side of this cyclic | annular protrusion wall. In addition, in this specification, let the front-end | tip of the insertion side to a flexible hose be a front-end | tip part direction, and let the opposite side with respect to this front-end | tip part direction be a rear-end part direction.
[0015]
Next, the thin metal tube fitted with this seal ring member is inserted into the flexible hose, the flexible hose is pushed toward the rear end of the thin metal tube, and the thin metal tube is inserted into the flexible hose. The thin metal pipe and the flexible hose are connected by inserting a certain length. When inserting the thin metal pipe into the flexible hose, the inner peripheral surface of the flexible hose slides toward the rear end while pressing the seal ring member. The pressing force from the flexible hose to be moved to acts. However, since the seal ring member abuts the back surface in the rear end direction against the annular projecting wall, the seal ring member moves over the annular projecting wall and moves toward the rear end portion of the small-diameter metal tube. Hard to occur. Therefore, when the connection between the thin metal pipe and the flexible hose is completed, the seal ring member pressed and deformed by the flexible hose is uniformly adhered to the inner peripheral surface of the flexible hose. Reliable and airtightness can be obtained in the connection structure of the flexible hose.
[0016]
In the present invention, since the flexible hose has its inner diameter expanded on the annular projecting wall, a strong diameter reducing force is generated in the flexible hose near the annular projecting wall due to the reaction to the expanding force. Due to this reduced diameter force, the flexible hose strongly tightens the outer peripheral surface of the thin metal tube, and the pull-out resistance between the flexible hose and the thin metal tube increases. Furthermore, due to the synergistic effect of the diameter reduction force of the flexible hose and the elastic force of the seal ring member, the adhesion of the seal ring member to the inner peripheral surface of the flexible hose is increased, and excellent airtightness can be obtained.
[0017]
Further, in the invention described in Japanese Patent Laid-Open No. 9-126374 and the invention described in Japanese Patent No. 2673418, a part such as a bush member is required to connect the thin metal pipe and the flexible hose, and the parts are manufactured and assembled. There was a risk that the labor would increase and the cost would be high. However, in the present invention, a seal ring member is attached to the base of the annular projecting wall, and the thin metal pipe is simply inserted into the flexible hose, so that an excellent airtight connection can be achieved. The connection structure with the flexible hose can be realized at low cost with few parts and a simple structure.
[0018]
Further, unlike JP-A-9-100959, the present invention does not use any solvent or the like, thus preventing adverse effects on the working environment, and eliminating the troublesome and inefficient drying work and management troubles. The connection work with the thin metal pipe can be efficiently performed in a short time.
[0019]
In addition, the resin tube may be disposed in close contact with the outer periphery in the direction of the rear end portion on the side opposite to the distal end portion on the insertion side through the annular protruding wall. By interposing this resin tube between the flexible hose and the thin metal tube, the inner diameter of the flexible hose is expanded, and the diameter reduction force of the flexible hose due to the reaction is increased. Since the metal tube is tightened with a stronger force, the pull-out resistance between the thin metal tube and the flexible hose is improved. In addition, using resin tubes increases the number of parts, but it is a simple task of cutting a long tube and attaching it to a thin metal tube, requiring the work of manufacturing like a conventional bush member. And the material is inexpensive, so there is no impact on productivity.
[0020]
In addition, if the resin tube is disposed in close contact between the seal ring member disposed at the base of the annular protruding wall and the distal end portion on the insertion side, the small diameter metal tube is flexible in the direction of the distal end portion of the small diameter metal tube. The diameter reduction force of the hose is increased, and the flexible hose strongly tightens the outer peripheral surface in the direction of the tip portion, so that the pull-out resistance between the thin metal tube and the flexible hose can be improved.
[0021]
Further, the seal ring member is a seal ring member with a deformed cross-section foot provided with at least one foot projecting in the direction of the distal end portion on the insertion side of the thin metal tube on the inner peripheral surface in contact with the thin metal tube, If the resin tube is placed in close contact with the outer surface of the foot and the outer peripheral surface of the thin metal tube in the direction of the tip, and the foot of the seal ring member is fixed to the outer peripheral surface of the thin metal tube, the seal ring member The effect of preventing misalignment and excessive distortion is enhanced, and the seal ring member is uniformly adhered to the inner peripheral surface of the flexible hose, and the connection structure between the thin metal tube and the flexible hose is highly reliable and airtight. Can be obtained. When providing the foot portion, one ring-shaped foot portion may be provided on the seal ring member, or a plurality of small foot portions may be circumferentially arranged at regular intervals on the seal ring member. Also good.
[0022]
In addition, when the resin tube is disposed on the outer peripheral surface of the thin metal tube, the seal ring may be disposed in the rear end direction with respect to the annular projecting wall or in the distal direction with respect to the annular projecting wall. Even when fixing the foot part of the member to the outer peripheral surface of the thin metal tube, spooling and bulging are performed in the direction of the rear end of the annular protruding wall on the outer peripheral surface of the thin metal tube on which the resin tube is placed. An annular bulging portion may be provided by, for example. By providing the annular bulging portion and arranging the resin tube in this way, the inner diameter of the flexible hose is greatly expanded by the synergistic effect of the annular bulging portion and the resin tube, and the diameter reducing force due to the reaction increases. . Therefore, the tightening force of the thin metal tube by the flexible hose at the position of the annular bulge portion is further increased, and the pull-out resistance between the thin metal tube and the flexible hose can be further improved.
[0023]
In addition, the seal ring member may have a circular or elliptical cross-sectional shape in the vicinity of the contact portion with the inner peripheral surface of the flexible hose. It arrange | positions in a taper shape between the outer peripheral surface of a formation part and a non-formation part. Therefore, if the seal ring member is formed in a triangular shape so that the outer peripheral surface of the seal ring member can be securely adhered to the tapered inner peripheral surface of the flexible hose over a wide area, a highly reliable airtightness can be obtained. In addition, the material used for the seal ring member can be reduced. The seal ring member having a triangular cross section referred to in the present invention is a so-called triangle having three corners and three straight sides, as well as an Omusubi type having rounded corners or curved sides. It also includes a shape that is almost a triangle, such as a water droplet type.
[0024]
In addition, if the resin tube is coated with an adhesive on the inner peripheral surface that comes into contact with the small-diameter metal tube or is adhered to the outer peripheral surface of the small-diameter metal tube by heat shrinkage, the adhesiveness with the small-diameter metal tube is increased. Therefore, even if a pull-out force acts, it becomes difficult to separate the resin tube from the small-diameter metal tube, and the reliability of the pull-out resistance between the small-diameter metal tube and the flexible hose can be improved.
[0025]
In addition, the annular protruding wall on which the seal ring member is arranged forms the thin metal tube by inclining the insertion side surface toward the tip so that the included angle between the insertion side surface and the outer peripheral surface of the thin metal tube is an acute angle. Then, the seal ring member is sandwiched and fixed between the insertion side surface and the outer peripheral surface of the small-diameter metal tube. Therefore, the effect of preventing the displacement of the seal ring member when the flexible hose is attached to the thin metal pipe and the effect of preventing the annular protruding wall from getting over are improved.
[0026]
【Example】
Hereinafter, an example in which the present invention is applied to a fluid supply mechanism of an automobile will be described with reference to the drawings. (1) is a thin metal pipe, which is disposed on an under floor panel, a front panel, etc. Fuel main piping for supplying fuel to the fuel, fuel return piping for returning surplus fuel from the engine to the fuel tank, evaporation piping for adsorbing the fuel vapor in the fuel tank to the canister in the engine room, negative intake pressure Vacuum pipes, oil pipes, etc. that have relatively small diameters. As shown in FIG. 1, the plurality of small-diameter metal tubes (1) are connected by a flexible hose (2) made of rubber or resin to distribute fuel and the like. In order to maintain the airtightness of the connection structure between the thin metal pipe (1) and the flexible hose (2) and to facilitate the connection work, in the present invention, the seal ring member (3) is provided with a thin metal pipe ( The thin metal tube (1) is attached to 1) and has a structure as shown below.
[0027]
First, in the first embodiment shown in FIG. 1 and FIG. 2, the thin metal pipe (1) uses a smooth outer pipe (4) and is inserted into the flexible hose (2). Further, an annular projecting wall (7) is provided by spool processing. The annular projecting wall (7) has an insertion side surface (5) and a rear end side surface (6) projecting perpendicularly to the thin metal tube (1). The thin metal pipe (1) has an annular bulging portion (8) protruding from the annular projecting wall (7) in the direction of the rear end portion with a certain distance by spooling.
[0028]
Further, the annular projecting wall (7) has a very high surface roughness perpendicular to the tube axis, and is processed with a high surface pressure with a flat molding tool, so that a sealing surface with high accuracy and good surface roughness can be obtained. As a result, the outer peripheral surface of the annular projecting wall (7) is in close contact with the inner peripheral surface of the flexible hose (2) with high reliability and airtightness. In the thin metal pipe (1) configured as described above, the outer diameter of the annular protruding wall (7) is slightly larger than the annular protruding wall (7) on the outer periphery of the base of the insertion side surface (5). The seal ring member (3) having a small diameter and a circular or elliptical cross section near the inner peripheral surface of the flexible hose (2) can be brought into close contact with the inner peripheral surface of the flexible hose (2). Wearing.
[0029]
Further, since the seal ring member (3) is disposed in contact with the insertion side surface (5) of the high-precision annular protruding wall (7) as described above, the seal ring member (3) is misaligned or excessively moved. High distortion prevention effect. Further, since the outer diameter of the seal ring member (3) is slightly smaller than that of the annular projecting wall (7), it is flexible when the thin metal pipe (1) is inserted into the flexible hose (2). Even if the inner peripheral surface of the hose (2) presses the seal ring member (3) toward the rear end, the seal ring member (3) moves over the annular protruding wall (7) and moves toward the rear end. It will be difficult. Even if the seal ring member (3) is formed to have a small diameter, the seal ring member (3) has high adhesion to the inner peripheral surface of the flexible hose (2) and is highly reliable as described later. You can get sex.
[0030]
In order to connect the thin metal pipe (1) and the flexible hose (2) as described above, the tip of the thin metal pipe (1) is inserted into the flexible hose (2) as shown in FIG. Push the flexible hose (2) in the direction of the rear end of the thin metal tube (1). During the pushing operation, the inner peripheral surface of the flexible hose (2) presses and deforms the seal ring member (3) in the radial direction and moves the seal ring member (3) in the rear end direction. Try to. However, as described above, the seal ring member (3) is arranged on the insertion side surface (5) of the highly accurate annular projecting wall (7) and is smaller in diameter than the annular projecting wall (7). 3) Positional displacement and excessive distortion can be prevented, and smooth connection work between the flexible hose (2) and the thin metal pipe (1) is possible.
[0031]
Upon completion of this connection work, the seal ring member (3) that is elastically deformed by being pressed against the inner peripheral surface of the flexible hose (2) is applied to the inner peripheral surface of the flexible hose (2) by the restoring force of the reaction force. It adheres elastically. The flexible hose (2) is attached to a thin metal pipe (1) provided with an annular projecting wall (7) so that the inner peripheral surface is expanded by the annular projecting wall (7). As shown in FIG. 1, a tapered portion (9) is formed. Accordingly, the seal ring member (3) having a diameter smaller than the outer diameter of the annular projecting wall (7) is securely adhered to the inner peripheral surface of the tapered portion (9) of the flexible hose (2). . Further, by expanding the inner diameter of the annular projecting wall (7), the flexible hose (2) has a contact portion between the annular projecting wall (7) and the annular bulging portion (8) as a reaction. In this, a strong diameter reducing force acts. Since the flexible hose (2) tightens the thin metal pipe (1) by this strong diameter reducing force, the pull-out resistance between the flexible hose (2) and the thin metal pipe (1) increases.
[0032]
Further, the flexible hose (2) exerts a strong diameter reducing force not only on the contact portion with the annular projecting wall (7) but also on the tapered portion (9). The seal ring member (3) is deformed by the diameter-reducing force of the flexible hose (2) on the outer periphery of the seal ring member (3) and the elastic force of the seal ring member (3) without positional deviation or excessive distortion. The flexible hose (2) is in close contact with the inner peripheral surface, and the connection structure between the flexible hose (2) and the thin metal pipe (1) can provide highly reliable airtightness.
[0033]
Further, in the invention described in Japanese Patent Application Laid-Open No. 9-126374 and the invention described in Japanese Patent No. 2673418, parts such as a bush member are required for the connection between the thin metal pipe and the flexible hose. The cost and cost of molding such as injection molding, forging, cutting, and material costs were high. In the present invention, however, the seal ring member (3) is attached to the base of the annular projecting wall (7) and the flexible hose (2) is pushed into the thin metal pipe (1), thereby completing the connection operation. Therefore, it is possible to obtain highly reliable airtightness, and the connection structure between the thin metal pipe (1) and the flexible hose (2) can be implemented at low cost with a small number of parts and a simple structure.
[0034]
Further, unlike JP-A-9-100959, the present invention does not use any solvent or the like, thereby preventing adverse effects on the working environment, and eliminating the troublesome and inefficient drying work and the trouble of management. The connection work between 2) and the thin metal pipe (1) can be efficiently performed in a short time.
[0035]
In the first embodiment, the flexible hose (2) and the thin metal pipe (1) are provided by the annular projecting wall (7) and the annular bulge (8) provided on the thin metal pipe (1). Has a pull-out resistance. On the other hand, in another different second embodiment, as shown in FIG. 3, the direction of the rear end portion from the base portion of the rear end side surface (6) of the annular projecting wall (7) through the annular bulging wall (8). A short resin tube (10) is disposed in close contact with the outer peripheral surface of the thin metal tube (1) to obtain a pull-out resistance.
[0036]
This resin tube (10) is applied to the contact surface with the thin metal tube (1) by applying an adhesive and adhered to the outer peripheral surface of the thin metal tube (1), or a heat-shrinkable resin tube (10). ) Is disposed on the outer peripheral surface of the thin metal tube (1) and thermally contracted, so that it is in close contact with the thin metal tube (1) so as not to be separated. Further, in the second embodiment, an annular protruding wall (7) for mounting the seal ring member (3) is provided on the outer peripheral surface in the direction of the distal end of the thin metal tube (1), and this annular protruding wall (7) An annular bulging portion (8) having a small outer diameter is provided in the direction of the rear end portion at a constant interval, and a bulge portion (11) is provided at the distal end portion on the insertion side of the thin metal tube (1). It is protruding.
[0037]
Thus, by interposing the resin tube (10) between the thin metal pipe (1) and the flexible hose (2), the flexible hose (2) on the outer peripheral surface of the resin tube (10) is provided. The diameter reduction force of the tube increases and the flexible hose (2) strongly tightens the thin metal tube (1) through the resin tube (10), so the thin metal tube (1) and the flexible hose (2) The pull-out resistance can be further improved. Note that the use of the resin tube (10) is troublesome in the number of parts and the mounting of the resin tube (10). However, the long resin tube (10) is appropriately cut and bonded by adhesive or heat shrinkage. Since it is only attached to the small diameter metal pipe (1), it does not require precise work such as molding of the bushing member or attachment to the small diameter metal pipe as in the prior art, and the material is inexpensive, which affects the productivity. There is nothing to do.
[0038]
In the second embodiment, from the base of the rear end side surface (6) of the annular projecting wall (7) to the outer peripheral surface in the direction of the rear end portion of the thin metal pipe (1) including the annular bulge portion (8). Although the resin tube (10) is disposed, the resin tube (10) may be disposed only on the outer peripheral surface of the annular bulging portion (8), or the base portion of the annular protruding wall (7) and the annular bulging portion. You may arrange | position in the outer peripheral surface of a thin metal pipe (1) between protrusion parts (8). The resin tube (10) may be disposed only on the outer peripheral surface of the small-diameter metal tube (1) in the rear end direction with respect to the annular bulging portion (8), or the annular protruding wall (7) and the annular You may arrange | position on the outer peripheral surface of the small diameter metal pipe (1) from the arbitrary positions between the bulging part (8) to the rear end part direction rather than the annular bulging part (8).
[0039]
Further, in the first and second embodiments, the insertion side surface (5) of the annular projecting wall (7) on which the seal ring member (3) is arranged projects vertically with respect to the thin metal pipe (1). However, in another different third embodiment, as shown in FIG. 4, the insertion side surface (5) is set so that the included angle between the insertion side surface (5) and the outer peripheral surface of the thin metal tube (1) is an acute angle. ) Is inclined in the direction of the distal end portion on the insertion side of the small-diameter metal tube (1) to project the annular projecting wall (7). Since the seal ring member (3) is sandwiched and fixed between the insertion side surface (5) arranged in an acute angle and the outer peripheral surface of the small diameter metal tube (1), it is possible to attach to the small diameter metal tube (1). When the flexible hose (2) is pushed in, the effect of preventing the positional deviation of the seal ring member (3) can be improved. For this reason, the seal ring member (3) can be evenly adhered to the inner surface of the flexible hose (2), and the connection structure between the thin metal pipe (1) and the flexible hose (2) is highly reliable. Airtightness is obtained.
[0040]
Moreover, in the said 1st-3rd Example, although the cross-section tree | tree near the contact part with the internal peripheral surface of a flexible hose has arrange | positioned the circular or elliptical seal ring member (3), In the fourth embodiment, as shown in FIG. 5, the outer shape in the direction of the insertion side surface (5) is large in diameter, and has a triangular cross section having a tapered surface (13) whose diameter is small in the tip direction of the thin metal tube (1). The seal ring member (3) is arranged. The triangular cross section is a so-called triangle having three corners and three straight sides, as well as an Omusubi type having rounded corners or a curved side, a water drop type shown in FIG. Such a shape that is almost a triangle is also included. Thus, even if it is triangular, the flexible hose (2) forms a tapered portion (9) between the annular projecting wall (7) and the outer peripheral surface of the thin metal tube (1) in the direction of the tip. The tapered surface (13) of the seal ring member (3) is securely adhered to the inner peripheral surface of the flexible hose (2). Further, the cross-sectional shape in the vicinity of the contact portion with the inner peripheral surface of the flexible hose (2) is different from that of the inner peripheral surface of the flexible hose (2) in comparison with the circular or elliptical seal ring member (3). The contact area is increased, highly reliable airtightness is obtained, and the material used for the seal ring member (3) can be reduced.
[0041]
Also, in the fourth embodiment, the insertion side surface (5) of the annular projecting wall (7) is inclined in the direction of the distal end as in the third embodiment, so that the insertion side surface (5) and the small diameter metal tube (1 The seal ring member (3) having a triangular cross-section is sandwiched between the outer peripheral surface of the seal ring member (3), and the effect of preventing the displacement of the seal ring member (3) is enhanced. Furthermore, an annular bulging portion (8) is provided on the outer periphery in the direction of the rear end portion with a certain distance from the annular protruding wall (7), and a flexible hose (2) and a thin metal pipe (1) are provided. The pull-out resistance is increased.
[0042]
Moreover, in the said 2nd Example, although the resin tube (10) is arrange | positioned in the outer peripheral surface of the small diameter metal pipe (1) of the rear-end part direction from the cyclic | annular protrusion wall (7), In the example, as shown in FIG. 6, between the position of the outer peripheral surface of the thin metal tube (1) facing the seal ring member (3) and the distal end on the insertion side of the thin metal tube (1). The resin tube (10) is closely arranged. With this configuration, in the thin metal tube (1), the diameter reducing force of the flexible hose (2) on the outer peripheral surface in the direction of the tip is increased, and the outer peripheral surface in the section of the thin metal tube (1) is increased. The flexible hose (2) is strongly tightened and the pull-out resistance is improved.
[0043]
Further, in the sixth embodiment shown in FIG. 7, the seal ring member (3) has an inner peripheral surface in contact with the thin metal tube (1) and a distal end portion on the insertion side of the thin metal tube (1). A thing with a modified cross-section foot provided with at least one leg part (12) which protrudes is used. The foot portion (12) may be provided with only one annular foot portion (12) on the seal ring member (3), or a plurality of small foot portions (12) may be circumferentially arranged at regular intervals. Individually, it may project from the seal ring member (3). And this seal ring member (3) is arrange | positioned in the base outer periphery of the insertion side surface (5) of a cyclic | annular protrusion wall (7), and the front end of the insertion side of a thin metal pipe (1) from the outer surface of a foot | leg part (12). As shown in FIG. 7, the resin tube (10) is disposed in close contact with the portion, and the foot (12) of the seal ring member (3) is fixed to the thin metal tube (1).
[0044]
Also in the present embodiment, the insertion side surface (5) of the annular projecting wall (7) on which the seal ring member (3) is disposed is inclined in the direction of the tip as in the third embodiment, so that the seal ring member (3) The effect of preventing misalignment may be enhanced. And, by fixing the foot portion (12) of the seal ring member (3), the effect of preventing the displacement of the seal ring member (3) and the effect of preventing excessive distortion are further enhanced. The seal ring member (3) can be evenly adhered to the peripheral surface, and the connection structure between the thin metal pipe (1) and the flexible hose (2) can obtain highly reliable airtightness. Also in this embodiment, an annular bulging portion (8) is provided on the outer periphery of the thin metal tube (1) to provide a pull-out resistance between the flexible hose (2) and the thin metal tube (1). It is increasing.
[0045]
Further, in the seventh embodiment shown in FIG. 8, the annular protruding wall (7) on which the seal ring member (3) is arranged is arranged on the insertion side of the thin metal pipe (1) into the flexible hose (2). A little closer to the rear end. Further, in the eighth embodiment shown in FIG. 9, the annular projecting wall (7) is formed close to the distal end portion on the insertion side of the thin metal tube (1), and the rear end of the annular projecting wall (7). The resin tube (10) is closely attached to the outer periphery in the end direction, and the tightening force of the thin metal pipe (1) by the flexible hose (2) is increased so that it is fine with the flexible hose (2). The pull-out resistance with the diameter metal pipe (1) is improved.
[0046]
【The invention's effect】
The present invention is configured as described above, and in various mechanical devices such as vehicles, ships, construction machines, etc., particularly in automobiles, main piping of fuel, return piping, evaporation piping, vacuum piping, oil piping, and other relatively High airtightness can be obtained in the connection between the thin metal pipe having a small diameter and the flexible hose. Further, such a reliable and airtight connection structure is a simple structure in which an annular projecting wall is provided on the outer periphery of the thin metal pipe, and a seal ring member is disposed at the base of the insertion side surface of the annular projecting wall. The structure and the connection method can also be realized by a simple operation of inserting a small-diameter metal tube into the flexible hose and bringing the seal ring member into close contact with the inner peripheral surface of the flexible hose. Therefore, as compared with the case of using a bush member or the like as in the prior art, it can be obtained inexpensively with a small number of parts and an easy manufacturing technique. In addition, since no solvent is used, the adverse effect on the work environment is prevented, and there is no troublesome and inefficient drying and management, and the connection work between the flexible hose and the thin metal tube is efficient in a short time. Can be done.
[Brief description of the drawings]
FIG. 1 is a side view of a connection structure between a flexible hose and a thin metal pipe according to a first embodiment of the present invention.
FIG. 2 is a side view showing a connection process between the flexible hose and the thin metal pipe of the first embodiment.
FIG. 3 is a side view of a connection structure between a flexible hose and a thin metal pipe according to a second embodiment.
FIG. 4 is a side view of a thin metal pipe according to a third embodiment.
FIG. 5 is a side view of a thin metal pipe according to a fourth embodiment.
FIG. 6 is a side view of a thin metal pipe according to a fifth embodiment.
FIG. 7 is a side view of a thin metal pipe according to a sixth embodiment.
FIG. 8 is a side view of a connection structure between a flexible hose and a thin metal pipe according to a seventh embodiment.
FIG. 9 is a side view of a connection structure between a flexible hose and a thin metal pipe according to an eighth embodiment.
[Explanation of symbols]
1 Small metal pipe
2 Flexible hose
3 Seal ring member
5 Insertion side
7 annular protruding wall
8 Annular bulge
10 Resin tube
12 feet

Claims

In a connection structure in which a thin metal tube is inserted and connected into a flexible hose, an annular protruding wall is provided on the outer periphery in the direction of the distal end portion on the insertion side of the thin metal tube inserted into the flexible hose. A connection structure between a thin metal pipe and a flexible hose, wherein a seal ring member is attached to the outer periphery of the base of the insertion side surface of the protruding wall so as to be in close contact with the inner peripheral surface of the flexible hose.

2. The small-diameter metal tube according to claim 1, wherein the thin-diameter metal tube has a resin tube in close contact with an outer periphery in the rear end direction opposite to the insertion tip direction through an annular protruding wall. And flexible hose connection structure.

2. The thin metal tube according to claim 1, wherein the resin tube is closely disposed between the seal ring member disposed at the base portion of the annular protruding wall and the distal end portion on the insertion side. Connection structure with hose.

The seal ring member is a seal ring member with a deformed cross-section foot provided with at least one foot portion protruding in the direction of the distal end portion on the insertion side of the thin metal tube on the inner peripheral surface in contact with the thin metal tube. 2. A resin tube is disposed in close contact with the outer surface of the portion and the outer peripheral surface in the direction of the tip of the thin metal tube, and the foot portion of the seal ring member is fixed to the outer peripheral surface of the thin metal tube. Connection structure of 2 or 3 thin metal pipe and flexible hose.

The thin metal pipe according to claim 1, 2, 3, or 4, wherein the thin metal pipe is provided with an annular bulge portion in a rear end direction direction from an annular projecting wall on an outer peripheral surface on which the resin tube is disposed. Connection structure between tube and flexible hose.

5. The connection structure between a thin metal pipe and a flexible hose according to claim 1, wherein the seal ring member has a triangular cross section.

6. The resin tube is characterized in that an adhesive is applied to an inner peripheral surface that comes into contact with the thin metal tube, or is adhered to the outer peripheral surface of the thin metal tube by heat shrinkage. Connection structure of thin metal pipe and flexible hose.

The annular projecting wall on which the seal ring member is arranged is characterized in that the insertion side surface is inclined toward the tip so that the included angle between the insertion side surface and the outer peripheral surface of the thin metal tube is an acute angle. Connection structure of 2, 3, or 6 thin metal tube and flexible hose.