JP2004011877A

JP2004011877A - Connection structure of small-diameter metal tube and flexible hose

Info

Publication number: JP2004011877A
Application number: JP2002170147A
Authority: JP
Inventors: Haruo Nishihara; 西原　治雄; Yasuji Sakamoto; 坂本　保司; Kazuyoshi Takigawa; 滝川　一儀
Original assignee: Usui Kokusai Sangyo Kaisha Ltd
Current assignee: Usui Kokusai Sangyo Kaisha Ltd
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2004-01-15
Anticipated expiration: 2022-06-11
Also published as: JP4052882B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide the connection structure which can prevent a leak of the fuel by obtaining highly reliable airtightness in the connection structure of a small-diameter metal tube having a relatively small diameter and to be used for various piping of a vehicle, a vessel and a construction machinery and a flexible hose to each other, and to provide the connection structure having excellent airtightness without using a lot of members. <P>SOLUTION: In the connection structure for inserting the small-diameter metal tube 1 into the flexible hose 2 for connection, an annular projecting wall 7 is provided in the periphery of the small-diameter metal tube, which is to be inserted into the flexible hose 2, at a tip part thereof to be inserted. A seal ring member 3 is installed in the periphery of a base part of a surface 5 of the annular projecting wall 7 on the insertion side thereof freely to adhere the inner peripheral surface of the flexible hose 2. <P>COPYRIGHT: (C)2004,JPO

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 applications]
The present invention relates to a supply path for supplying liquid fuels such as gasoline and light oil, gaseous fuels such as propane and natural gas, compressed air, oil, negative pressure and the like to a target portion in an automobile, a general industrial machine and the like. The present invention relates to a connection structure between a relatively small-diameter thin metal tube provided as a flexible pipe and a flexible hose formed of resin, rubber, or the like.
[0002]
[Prior art]
Conventionally, the outer diameter of 20 mm or less for supplying liquid fuels such as gasoline and light oil, gaseous fuels such as propane and natural gas, compressed air, oil, negative pressure, etc. to target parts in automobiles and general industrial machines As a connection structure between a relatively small diameter metal tube and a flexible hose formed of resin, rubber, or the like, there are an invention described in Japanese Patent Application Laid-Open No. 9-126374 and an invention described in Japanese Patent No. 2673418. In these conventional inventions, a tapered bush member is connected to the outer periphery of a small-diameter metal tube or a connector connected to the small-diameter metal tube, and an annular bulging portion is projected adjacent to the bush member by spool processing. Has been established. By inserting and disposing a seal ring member elastically in close contact with the inner peripheral surface of the flexible hose in the mounting concave portion formed by the annular bulging portion and the bush member, the small diameter metal tube and the flexible hose can be connected to each other. They are trying to keep them airtight.
[0003]
[Problems to be solved by the invention]
However, in this conventional connection structure, the shape and width of the mounting concave portion of the seal ring member composed of the bush member and the annular bulging portion are likely to vary. In addition, the molding of the bush member requires labor and material costs such as high-precision injection molding, forging, cutting, and the like, and also requires assembling the bush member on a small-diameter metal pipe, thereby reducing productivity.
[0004]
In another different conventional invention described in JP-A-9-100959, a fixing layer is provided by applying rubber or resin to the inner peripheral surface of a flexible hose. When a small-diameter metal tube or the like is inserted and connected in the flexible hose, this highly adhesive fixing layer is brought into close contact with the outer periphery of the small-diameter metal tube, thereby making the small-diameter metal tube and the flexible hose airtight. She was trying to keep her sex. However, since the rubber or resin is dissolved in a solvent and applied to the flexible hose, if the small-diameter metal tube is inserted while the solvent is not sufficiently dried, it is fixed from the inner peripheral surface of the flexible hose by the small-diameter metal tube. If the layer is rubbed off and the airtightness is impaired or excessively dried, sufficient airtightness may not be obtained. Therefore, in order to maintain high quality, it is necessary to dry the fixing layer appropriately and stabilize it before connecting the flexible hose and the small-diameter metal pipe, which makes the management of the pot life cumbersome and inefficient. It was work. In addition, since the solvent is used, there is a danger of harming the health of workers and adversely affecting the environment.
[0005]
The present invention is intended to solve the above-mentioned problems, and in various mechanical devices such as vehicles, ships, and construction machines, particularly in automobiles, fuel main pipes, return pipes, evaporative pipes, vacuum pipes, oil pipes, and the like. It is possible to obtain highly reliable airtightness in a connection structure between a flexible hose and a pipe or other small metal pipe having a relatively small diameter. In addition, this highly airtight connection structure can be realized by an easy manufacturing method without using many members, and the airtightness can be maintained for a long time and excellent in durability.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a connection structure for inserting and connecting a small-diameter metal tube into a flexible hose. An annular protruding wall is provided on the outer periphery of the flexible protruding wall, and a seal ring member is attached to the inner peripheral surface of the flexible hose so as to be in close contact with the inner peripheral surface of the insertion side surface of the annular protruding wall.
[0007]
Further, in the small-diameter metal tube, a resin tube may be disposed in close contact with the outer peripheral surface in the direction of the rear end opposite to the direction of the distal end on the insertion side via the annular protruding wall.
[0008]
In the small-diameter metal tube, a resin tube may be closely arranged between the seal ring member arranged at the base of the annular protruding wall and the distal end 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 portion protruding in the direction of the distal end on the insertion side of the small-diameter metal tube on the inner peripheral surface in contact with the small-diameter metal tube, A resin tube may be closely attached to the outer surface of the foot portion and the outer peripheral surface in the direction of the distal end of the small-diameter metal tube, and the foot portion of the seal ring member may be fixed to the outer peripheral surface of the small-diameter metal tube.
[0010]
Further, the small-diameter metal tube may be provided with an annular bulge in a direction toward the rear end from the annular protruding wall on the outer peripheral surface where the resin tube is arranged.
[0011]
Further, the seal ring member may have a triangular cross section.
[0012]
In addition, the resin tube may be adhered to 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 heat shrinkage.
[0013]
Further, the annular protruding wall on which the seal ring member is arranged may have the insertion side surface inclined toward the distal end so that the included angle between the insertion side surface and the outer peripheral surface of the small-diameter metal tube becomes an acute angle.
[0014]
[Action]
Since the present invention is configured as described above, in a variety of mechanical devices such as vehicles, ships, and construction machines, particularly in automobiles, fuel main piping, return piping, evaporation piping, vacuum piping, oil piping, and other To connect a relatively small-diameter metal tube to a flexible hose made of rubber or resin, first, bulge processing, spool processing, etc. are performed on the outer periphery of the small-diameter metal tube in the direction of the distal end on the side of insertion into the flexible hose. To provide an annular protruding wall. Then, a seal ring member is attached to the outer periphery of the base of the insertion side surface on the insertion side of the annular protruding wall so as to make close contact with the inner peripheral surface of the flexible hose. In addition, in this specification, the front end on the insertion side into the flexible hose is defined as the front end direction, and the opposite side to the front end direction is defined as the rear end direction.
[0015]
Next, the small-diameter metal tube to which the seal ring member is attached is inserted into a flexible hose, and the flexible hose is pushed toward the rear end of the small-diameter metal tube so that the small-diameter metal tube is inserted into the flexible hose. By inserting a fixed length, the thin metal tube and the flexible hose are connected. When the small-diameter metal tube is inserted 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 that is to be moved acts on. However, since the back surface of the seal ring member in the rear end direction abuts against the annular protruding wall, the seal ring member moves over the annular protruding wall toward the rear end portion of the small-diameter metal tube, and may cause distortion. It is unlikely to occur. Therefore, when the connection between the small-diameter metal tube and the flexible hose is completed, the seal ring member pressed and deformed by the flexible hose uniformly adheres to the inner peripheral surface of the flexible hose. A highly reliable airtightness is obtained in the connection structure of the flexible hose.
[0016]
In the present invention, since the inner diameter of the flexible hose is expanded at the annular protruding wall, a strong radial contraction force is generated in the flexible hose near the annular protruding wall due to a reaction to the expanding force. Due to this diameter reducing force, the flexible hose strongly tightens the outer peripheral surface of the small-diameter metal tube, and the pull-out resistance between the flexible hose and the small-diameter metal tube increases. Further, due to the synergistic effect of the diameter reducing 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 Application Laid-Open No. Hei 9-126374 and the invention described in Japanese Patent No. 2673418, parts such as a bush member are required for connecting the small-diameter metal tube and the flexible hose, and the production and assembly of the parts are required. There is a concern that the labor is increased and the cost is increased. However, in the present invention, it is possible to achieve a highly airtight connection simply by attaching the seal ring member to the base of the annular protruding wall and inserting the small-diameter metal tube into the flexible hose. The connection structure with the flexible hose can be realized at low cost with a small number of parts and a simple structure.
[0018]
Also, unlike Japanese Patent Application Laid-Open No. 9-100959, the present invention does not use any solvent or the like at all, so that it has no adverse effects on the working environment, and has no troublesome and inefficient drying work and labor for management. Connection work with a small-diameter metal tube can be performed efficiently in a short time.
[0019]
Further, in the small-diameter metal tube, a resin tube may be arranged in close contact with the outer periphery in the direction of the rear end opposite to the front end on the insertion side via the annular protruding wall. When the resin tube is interposed between the flexible hose and the small-diameter metal tube, the inner diameter of the flexible hose is widened, and the reaction reduces the diameter of the flexible hose. Since the metal tube is tightened with a stronger force, the pull-out resistance between the small-diameter metal tube and the flexible hose is improved. In addition, the use of resin tubes increases the number of components, but it is a simple task of cutting a long tube and attaching it to a small-diameter metal tube. It does not affect the productivity because the material is inexpensive.
[0020]
Further, if the resin tube is closely attached between the seal ring member disposed at the base of the annular protruding wall and the distal end on the insertion side, the small-diameter metal tube can be flexed in the distal direction of the small-diameter metal tube. The diameter reducing force of the hose is increased, and the outer peripheral surface in the direction of the distal end is strongly tightened by the flexible hose, so that the pull-out resistance between the small-diameter 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 portion protruding in the direction of the distal end on the insertion side of the small-diameter metal tube on the inner peripheral surface in contact with the small-diameter metal tube, If the resin tube is closely attached to the outer surface of the foot portion and the outer peripheral surface in the direction of the distal end of the small-diameter metal tube, and the foot portion of the seal ring member is fixed to the outer peripheral surface of the small-diameter metal tube, The effect of preventing displacement and excessive distortion is enhanced, and the seal ring member is evenly adhered to the inner peripheral surface of the flexible hose, providing a highly reliable airtight connection to the connection structure between the small-diameter metal tube and the flexible hose. Can be obtained. When providing the foot portion, one annular foot portion may be provided on the seal ring member, or a plurality of small piece-shaped foot portions may be arranged on the seal ring member circumferentially at regular intervals. Is also good.
[0022]
Further, when the resin tube is arranged on the outer peripheral surface of the small-diameter metal tube, the seal ring may be arranged regardless of whether the resin tube is arranged rearward of the annular protruding wall or distal end of the annular protruding wall. Even when the foot of the member is fixed to the outer peripheral surface of the small-diameter metal tube, spooling and bulging are performed in the direction toward the rear end from the annular protruding wall on the outer peripheral surface of the small-diameter metal tube where the resin tube is arranged. For example, an annular bulge may be provided. By arranging the resin tube by providing the annular bulging portion 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 contraction force due to the reaction increases. . Therefore, the tightening force of the flexible hose at the position of the annular bulging portion by the flexible hose is further increased, and the pull-out resistance between the small diameter metal tube and the flexible hose can be further improved.
[0023]
Further, the seal ring member may have a circular or elliptical cross-sectional shape in the vicinity of the abutting portion with the inner peripheral surface of the flexible hose. It is arranged in a taper shape between the formed portion and the outer peripheral surface of the non-formed portion. Therefore, if the seal ring member is formed to have a triangular cross section 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, highly reliable airtightness can be obtained. And the material used for the seal ring member can be reduced. Note that the seal ring member having a triangular cross section in the present invention is not only a so-called triangle having three corners and three straight sides, but also an osby type having rounded corners and curved sides. , Such as a water drop type or the like.
[0024]
Further, 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 enhanced. Therefore, even if a pull-out force acts, the resin tube is hardly separated 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 is formed such that the insertion side surface is inclined toward the distal end so that the included angle between the insertion side surface and the outer peripheral surface of the small diameter metal tube becomes an acute angle to form a small diameter metal tube. 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 displacement of the seal ring member when the flexible hose is attached to the small-diameter metal tube and the effect of preventing the annular protruding wall from getting over are improved.
[0026]
【Example】
An example in which the present invention is applied to a fluid supply mechanism of an automobile will be described below with reference to the drawings. (1) A small-diameter metal pipe is provided on an underfloor panel, a front panel, and the like, and is provided from a fuel tank to an engine room. Utilizes fuel main pipe to supply fuel to fuel tank, fuel return pipe to return excess fuel from engine to fuel tank, evaporative pipe to adsorb fuel vapor in fuel tank to canister in engine room, and negative pressure of intake air It has a relatively small diameter, such as a vacuum pipe or an oil pipe. As shown in FIG. 1, the plurality of small metal tubes (1) are connected by a flexible hose (2) made of rubber or resin, and the fuel and the like are circulated. In order to maintain the airtightness of the connection structure between the small-diameter metal tube (1) and the flexible hose (2) and to facilitate the connection operation, in the present invention, the seal ring member (3) is connected to the small-diameter metal tube ( 1), and the small-diameter metal tube (1) has a structure as shown below.
[0027]
First, in the first embodiment shown in FIGS. 1 and 2, the thin metal tube (1) uses an outer tube (4) having a smooth outer surface and is inserted into a flexible hose (2) in the direction of the distal end. , An annular protruding wall (7) is provided by spool processing. The annular protruding wall (7) has an insertion side surface (5) and a rear end side surface (6) projecting perpendicularly to the small-diameter metal tube (1). Further, the small-diameter metal tube (1) has an annular bulge (8) projecting from the annular projecting wall (7) toward the rear end portion at a predetermined interval by spool processing.
[0028]
Further, the annular protruding wall (7) has a very high surface roughness perpendicular to the pipe axis, and is processed at 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) closely adheres to the inner peripheral surface of the flexible hose (2) with high reliability and airtightness. Then, in the small-diameter metal tube (1) configured as described above, the outer diameter of the annular projecting wall (7) is slightly smaller than the annular projecting wall (7) on the outer periphery of the base of the insertion side surface (5). A seal ring member (3) having a small diameter and having a circular or elliptical cross section near a contact portion with the inner peripheral surface of the flexible hose (2) can be closely attached to the inner peripheral surface of the flexible hose (2). I am wearing it.
[0029]
In addition, since the seal ring member (3) is disposed in contact with the insertion side surface (5) of the high-precision annular projecting wall (7) as described above, misalignment or excessive displacement of the seal ring member (3) occurs. The effect of preventing distortion is high. Further, since the outer diameter of the seal ring member (3) is slightly smaller than that of the annular protruding wall (7), the seal ring member (3) is flexible when the small diameter metal tube (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 projecting 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, as described later, the seal ring member (3) has high adhesion to the inner peripheral surface of the flexible hose (2), and has a highly reliable airtightness. You can get sex.
[0030]
To connect the small diameter metal tube (1) and the flexible hose (2) as described above, as shown in FIG. 1, insert the tip of the small diameter metal tube (1) into the flexible hose (2), A flexible hose (2) is pushed toward the rear end of the small-diameter metal tube (1). During this 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) toward the rear end. To try. However, as described above, since the seal ring member (3) is arranged on the insertion side surface (5) of the high-precision annular protruding wall (7) and has a smaller diameter than the annular protruding wall (7), the seal ring member (3) is formed. The displacement and excessive distortion of 3) can be prevented, and the connection work between the flexible hose (2) and the small-diameter metal tube (1) can be performed smoothly.
[0031]
Upon completion of this connection work, the seal ring member (3), which has been pressed against the inner peripheral surface of the flexible hose (2) and elastically deformed, is restored to the inner peripheral surface of the flexible hose (2) by the restoring force of the reaction force. Adhere elastically. The flexible hose (2) is attached to the small-diameter metal tube (1) provided with the 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. Therefore, the seal ring member (3) having a diameter smaller than the outer diameter of the annular protruding wall (7) is securely adhered to the inner peripheral surface of the tapered portion (9) of the flexible hose (2). . In addition, by expanding the inner diameter of the annular protruding wall (7), as a reaction, the flexible hose (2) comes into contact with each of the annular protruding wall (7) and the annular bulging portion (8). In this case, a strong contraction force acts. Since the flexible hose (2) tightens the small-diameter metal tube (1) by the strong diameter-reducing force, the pull-out resistance between the flexible hose (2) and the small-diameter metal tube (1) is increased.
[0032]
Further, the flexible hose (2) exerts a strong radial contraction force not only on the contact portion with the annular protruding wall (7) but also on the tapered portion (9). The seal ring member (3) is formed by the contraction force of the flexible hose (2) at the outer periphery of the seal ring member (3) and the elastic force of the seal ring member (3) without displacement and excessive distortion. The flexible hose (2) comes into close contact with the inner peripheral surface of the flexible hose (2), and the connection structure between the flexible hose (2) and the small-diameter metal tube (1) can obtain highly reliable airtightness.
[0033]
In addition, in the prior art 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 connection between a small-diameter metal tube and a flexible hose, and high precision is required. Injection molding, forging, cutting, and other forming processes and material costs were required, resulting in high costs. However, in the present invention, the connection operation is completed by simply attaching the seal ring member (3) to the base of the annular protruding wall (7) and pushing the flexible hose (2) into the small-diameter metal tube (1). A highly reliable airtightness can be obtained, and the connection structure between the small-diameter metal tube (1) and the flexible hose (2) can be implemented at low cost with a small number of parts and a simple structure.
[0034]
Also, unlike Japanese Patent Application Laid-Open No. 9-100959, the present invention does not use any solvent or the like at all, so that adverse effects on the working environment are prevented, and there is no need for cumbersome and inefficient drying work and management, and a flexible hose ( The connection work between 2) and the small-diameter metal pipe (1) can be efficiently performed in a short time.
[0035]
In the first embodiment, the flexible hose (2) and the small-diameter metal tube (1) are connected to each other by the annular protruding wall (7) and the annular bulge (8) provided on the small-diameter metal tube (1). Withdrawal resistance. On the other hand, in another different second embodiment, as shown in FIG. 3, the base portion of the rear end side surface (6) of the annular protruding wall (7) is moved toward the rear end portion through the annular bulging wall (8). A short resin tube (10) is closely attached to the outer peripheral surface of the small-diameter metal tube (1) to obtain a pull-out resistance.
[0036]
The resin tube (10) may be coated with an adhesive on the contact surface with the small-diameter metal tube (1) and adhered to the outer peripheral surface of the small-diameter metal tube (1). ) Is arranged on the outer peripheral surface of the small-diameter metal tube (1) and is thermally contracted, so that the small-diameter metal tube (1) is closely attached to the small-diameter metal tube (1). In the second embodiment, an annular protruding wall (7) for mounting a seal ring member (3) is provided on the outer peripheral surface of the small-diameter metal tube (1) in the direction of the distal end. An annular bulge (8) having a small outer diameter is provided in the direction of the rear end at a constant interval, and a bulge (11) is provided at the tip of the small-diameter metal tube (1) on the insertion side. It is protruding.
[0037]
By interposing the resin tube (10) between the flexible tube (1) and the flexible hose (2) in this manner, the flexible hose (2) on the outer peripheral surface of the resin tube (10) is provided. As the flexible hose (2) strongly tightens the small-diameter metal tube (1) via the resin tube (10), the diameter of the small-diameter metal tube (1) and the flexible hose (2) are increased. The pull-out resistance can be further improved. In addition, by using the resin tube (10), the number of parts and the labor of mounting the resin tube (10) are required. However, the long resin tube (10) is appropriately cut, and an adhesive or heat shrinkage is performed. Since it is only attached to the small-diameter metal tube (1), there is no need for precise work such as molding of the bush member or mounting to the small-diameter metal tube as in the prior art, and the material is inexpensive, which affects productivity. Nothing to do.
[0038]
In the second embodiment, the outer peripheral surface of the small-diameter metal tube (1) including the annular bulge (8) extends from the base of the rear end side surface (6) of the annular protruding wall (7) toward the rear end. Although the resin tube (10) is arranged, the resin tube (10) may be arranged only on the outer peripheral surface of the annular bulging portion (8), or may be arranged with the base of the annular protruding wall (7). It may be arranged on the outer peripheral surface of the small-diameter metal tube (1) between the protrusion (8). Further, the resin tube (10) may be arranged only on the outer peripheral surface of the small-diameter metal tube (1) in the direction toward the rear end portion from the annular bulging portion (8). It may be arranged on the outer peripheral surface of the small-diameter metal tube (1) from an arbitrary position between the bulging portion (8) and the rear end direction from the annular bulging portion (8).
[0039]
In the first and second embodiments, the insertion side surface (5) of the annular protruding wall (7) on which the seal ring member (3) is arranged is provided so as to project perpendicularly to the small-diameter metal tube (1). However, in another different third embodiment, as shown in FIG. 4, the insertion side surface (5) is so formed that the included angle between the insertion side surface (5) and the outer peripheral surface of the small-diameter metal tube (1) is an acute angle. ) Is inclined toward the distal end on the insertion side of the small-diameter metal tube (1) to project the annular projecting wall (7). Then, the seal ring member (3) is sandwiched and fixed between the insertion side surface (5) arranged at an acute angle and the outer peripheral surface of the small-diameter metal tube (1). When the flexible hose (2) is pushed in, the effect of preventing the displacement of the seal ring member (3) can be improved. Therefore, the seal ring member (3) can be uniformly adhered to the inner surface of the flexible hose (2), and the connection structure between the small-diameter metal tube (1) and the flexible hose (2) has high reliability. Airtightness is obtained.
[0040]
In the first to third embodiments, the seal ring member (3) having a circular or elliptical cross section in the vicinity of the contact portion with the inner peripheral surface of the flexible hose is arranged. In the fourth embodiment, as shown in FIG. 5, a triangular cross section having a tapered surface (13) having a large outer shape in the direction of the insertion side surface (5) and a small diameter in the tip end direction of the small-diameter metal tube (1). The seal ring member (3) is disposed. This triangular cross section is not only a so-called triangle having three corners and three straight sides, but also a rounded corner, an omsby type having curved sides, a water droplet type shown in FIG. 5, and the like. Such a shape includes an almost triangular shape. As described above, even when the flexible hose (2) has a triangular shape, the flexible hose (2) forms the tapered portion (9) between the annular protruding wall (7) and the outer peripheral surface of the small-diameter metal tube (1) in the distal end direction. The tapered surface (13) of the seal ring member (3) securely adheres to the inner peripheral surface of the flexible hose (2). Further, compared to the seal ring member (3) having a circular or elliptical cross-section near the contact portion with the inner peripheral surface of the flexible hose (2), the flexible hose (2) has a larger cross-sectional shape. The contact area increases, highly reliable airtightness can be 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 protruding wall (7) is inclined toward the distal end as in the third embodiment, so that the insertion side surface (5) and the small-diameter metal tube (1) are inclined. The seal ring member (3) having a triangular cross section is sandwiched between the outer peripheral surface of the seal ring member and the seal ring member (3) to enhance the effect of preventing the seal ring member (3) from being displaced. Further, an annular bulge (8) is protrudingly provided on the outer periphery in the rear end direction at a predetermined distance from the annular protruding wall (7) to provide a flexible hose (2) and a small-diameter metal tube (1). Of the pull-out resistance.
[0042]
In the second embodiment, the resin tube (10) is disposed on the outer peripheral surface of the small-diameter metal tube (1) in the direction toward the rear end from the annular protruding wall (7). In the example, as shown in FIG. 6, between the position on the outer peripheral surface of the small-diameter metal tube (1) facing the seal ring member (3) and the tip of the insertion side of the small-diameter metal tube (1). , And a resin tube (10) is closely arranged. With this configuration, in the small-diameter metal tube (1), the diameter reducing force of the flexible hose (2) on the outer peripheral surface in the distal end portion direction is increased, and the outer peripheral surface of the small-diameter metal tube (1) in the section is reduced. The flexible hose (2) is strongly tightened, and pull-out resistance is improved.
[0043]
In the sixth embodiment shown in FIG. 7, the seal ring member (3) is provided on the inner peripheral surface in contact with the small-diameter metal tube (1) in the direction toward the distal end of the insertion side of the small-diameter metal tube (1). A profiled foot with at least one protruding foot (12) is used. This 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. Alternatively, the protrusion may be provided on the seal ring member (3). Then, this seal ring member (3) is arranged on the outer periphery of the base of the insertion side surface (5) of the annular protruding wall (7), and the tip of the insertion side of the small-diameter metal tube (1) from the outer surface of the foot (12). As shown in FIG. 7, a 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 small-diameter metal tube (1).
[0044]
Also, in this embodiment, the insertion side surface (5) of the annular protruding wall (7) on which the seal ring member (3) is disposed is inclined toward the distal end similarly to the third embodiment, and the seal ring member (3) is formed. May be improved. By fixing the foot portion (12) of the seal ring member (3), the effect of preventing the position of the seal ring member (3) from shifting and the effect of preventing excessive distortion are further enhanced. The seal ring member (3) can be uniformly adhered to the peripheral surface, and the connection structure between the small-diameter metal tube (1) and the flexible hose (2) can obtain highly reliable airtightness. Also in this embodiment, an annular bulge (8) is protruded from the outer periphery of the small-diameter metal tube (1) to reduce the pull-out resistance between the flexible hose (2) and the small-diameter metal tube (1). Is increasing.
[0045]
In the seventh embodiment shown in FIG. 8, the annular protruding wall (7) on which the seal ring member (3) is disposed is located on the side of the small-diameter metal tube (1) inserted into the flexible hose (2). It is formed slightly near the rear end. In the eighth embodiment shown in FIG. 9, the annular protruding wall (7) is formed close to the distal end of the small-diameter metal tube (1) on the insertion side, and is formed behind the annular protruding wall (7). A resin tube (10) is closely attached in a long shape to the outer periphery in the end direction, and the tightening force of the flexible hose (2) for the small-diameter metal tube (1) is increased, so that the resin tube (10) and the flexible hose (2) can be narrowed. 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, a fuel main pipe, a return pipe, an evaporation pipe, a vacuum pipe, an oil pipe, and other relatively High airtightness can be obtained for the connection between the thin metal tube and the flexible hose. In addition, such a connection structure having a highly reliable airtightness is a simple structure in which an annular projecting wall is provided on the outer periphery of a small-diameter metal tube, and a seal ring member is arranged at a base of an insertion side surface of the annular projecting wall. The connection method can be realized by a simple operation in which a small-diameter metal tube is inserted into a flexible hose and the seal ring member is brought 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 is possible to obtain inexpensively with a smaller number of parts and easier manufacturing technology. In addition, since no solvent is used at all, the work environment can be prevented from being adversely affected, and there is no need for cumbersome and inefficient drying work and labor for management. Can be done
[Brief description of the drawings]
FIG. 1 is a side view of a connection structure between a flexible hose and a small-diameter metal tube 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 small-diameter metal tube of the first embodiment.
FIG. 3 is a side view of a connection structure between a flexible hose and a small-diameter metal tube according to a second embodiment.
FIG. 4 is a side view of a small-diameter metal tube according to a third embodiment.
FIG. 5 is a side view of a small-diameter metal tube according to a fourth embodiment.
FIG. 6 is a side view of a small-diameter metal tube according to a fifth embodiment.
FIG. 7 is a side view of a small-diameter metal tube according to a sixth embodiment.
FIG. 8 is a side view of a connection structure between a flexible hose and a small-diameter metal tube according to a seventh embodiment.
FIG. 9 is a side view of a connection structure between a flexible hose and a small-diameter metal tube according to an eighth embodiment.
[Explanation of symbols]
1 small diameter metal tube
2 Flexible hose
3 Seal ring member
5 Insert side
7 annular protruding wall
8 Annular bulge
10 Resin tube
12 feet

Claims

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

2. The small-diameter metal tube according to claim 1, wherein the small-diameter metal tube has a resin tube closely attached to an outer periphery in a rear end direction opposite to a front end direction on an insertion side via an annular projecting wall. Connection structure between the flexible hose.

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

The seal ring member is a seal ring member with a modified cross-section foot having at least one foot protruding in the direction of the distal end on the insertion side of the small-diameter metal tube on the inner peripheral surface in contact with the small-diameter metal tube. The resin tube is closely attached to the outer surface of the portion and the outer peripheral surface of the small-diameter 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 small-diameter metal tube. A connection structure between a small-diameter metal tube of 2 or 3 and a flexible hose.

5. The small-diameter metal tube according to claim 1, wherein the small-diameter metal tube has an annular bulging portion provided in a direction toward a rear end portion of the outer peripheral surface on which the resin tube is disposed. Connection structure between pipe and flexible hose.

5. The connection structure according to claim 1, wherein the seal ring member has a triangular cross section.

6. The resin tube according to claim 2, wherein an adhesive is applied to an inner peripheral surface of the resin tube which is in contact with the small-diameter metal tube, or the resin tube is brought into close contact with an outer peripheral surface of the small-diameter metal tube by heat shrinkage. Connection structure between a small diameter metal tube and a flexible hose.

2. An annular projecting wall on which a seal ring member is disposed, wherein the insertion side surface is inclined toward the distal end so that the included angle between the insertion side surface and the outer peripheral surface of the small-diameter metal tube becomes an acute angle. Connection structure between 2, 3, or 6 small diameter metal tubes and flexible hoses.