JP2004100811A

JP2004100811A - Eye joint, connecting structure between eye joint and pipe and its method

Info

Publication number: JP2004100811A
Application number: JP2002263006A
Authority: JP
Inventors: Shu Yotsumoto; 四元　衆
Original assignee: Usui Kokusai Sangyo Kaisha Ltd
Current assignee: Usui Kokusai Sangyo Kaisha Ltd
Priority date: 2002-09-09
Filing date: 2002-09-09
Publication date: 2004-04-02

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure between a pipe for an automobile or others and an eye joint with highly reliable airtightness and a pullout resistance force and to improve the productivity and to secure safety by connecting and manufacturing of the eye joint by a simple method and with a low cost. <P>SOLUTION: This eye joint 3 comprises an eye joint body 6 penetratingly formed with a fitting hole 8 for an eye bolt 17 in a shaft core part and provided with a flow passage 26 orthogonally crossing with the fitting hole 8, and a branch pipe 10 orthogonally crossing with the shaft core of the fitting hole 8 integrally with the eye joint body 6 and provided communicably with the flow passage 26. The pipe 1 can be inserted and connected to the branch pipe 10, a contact part between the outer circumferential surface 2 of the insertion part 4 of the pipe 1 and the internal circumferential surface 12 of the branch pipe is made of resin and can be welded and fixed by a welding means. An engagement claw 16 of the branch pipe 10 is engaged with an annular swelling part 5 formed in the outer circumference of the pipe 1 via a prescribed interval apart from the tip of the insertion part 4 and formed into a pullout prevention means of the pipe 1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【産業上の利用分野】
本発明は、自動車用配管、各種機械・装置用配管、その他の配管を基体に直交して取り付けるためのアイジョイント及びこのアイジョイントと配管との接続構造並びにその接続方法に係るもので、アイジョイントと配管との接続を容易な接続方法で廉価に行い、アイジョイントと配管との信頼性の高い気密性及び耐引き抜け力を得るとともに、このようなアイジョイントを容易に形成可能とするものである。
【０００２】
【従来の技術】
従来、自動車用配管、各種機械・装置用配管、その他の金属製の配管、特に自動車用の燃料、エアー、潤滑油等を流通する配管を、アンダーフロアパネル、前面パネル等に配設する際に、該配管を基体に直交して接続する継手として、金属製のアイジョイントが一般的に使用されている。このアイジョイントは、例えば鋼材を冷間鍛造して球状に形成したアイジョイント本体の側面に、配管挿入用の枝管をアイボルトと直交方向に突出形成する。そして、アイジョイント本体の内部と枝管内部とを加工して、燃料その他の流体の流路を、互いに連通可能に形成している。このように形成したアイジョイントの枝管内に配管を挿入し、枝管の先端と配管の外周面とをろう付けして、アイジョイントと配管とを接続していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の如き従来技術では、アイジョイントの加工や配管との接続に、熟練作業による複雑な技術と多くの工数が掛かり、製造コストが高価であった。また、ろう付け作業時に使用するフラックス等により、作業環境や人体に影響を与える等の問題もあった。また、ろう付け作業では、亜鉛メッキ等の防錆処理済みの配管を用いると、ろう付け時の熱で亜鉛メッキが剥げてしまう。そのため、防錆処理を施していない配管を使用し、ろう付け終了後に、亜鉛メッキ等の防錆処理を行う必要があり、製造工程を更に増やしていた。
【０００４】
また、実公昭６０−５１９０号公報記載の考案の如く、アイジョイントを樹脂で形成して、加工作業を簡易化した製品が存在する。この従来技術では、枝管の先端のシート面に、フレア加工した配管を当接した後に、金属製の接続ナットで枝管と配管とを外周から締め付け、双方の接続を行っていた。従って、アイジョイントと配管との接続にろう付けを必要とせず、防錆処理済みの配管を使用でき、作業環境や人体にも安全であった。しかし、この従来技術では、枝管の外周に金属螺子環を融着固定しているので、枝管先端のシート面に配管を当接するには、配管にフレア加工を施して塑性変形させる必要があり、配管の製造に手間や多くの技術を必要とする。また、金属製の接続ナットを用いる等、部品点数が多く、組み付けに多くの手数を必要としていた。
【０００５】
また、公開前であるが、本出願人の特願２００１−３０３３５５号の発明では、アイジョイント本体を樹脂で形成し、この樹脂製のアイジョイント本体の枝管に、樹脂被膜又は樹脂チューブを外周に密着配置した金属製の配管を挿入し、この配管の外周の樹脂被膜又は樹脂チューブと枝管の樹脂とを溶着固定し、配管とアイジョイント本体とを接続するものである。
【０００６】
このような樹脂同志の溶着によって接続する事で、アイジョイントと配管との接続構造に、信頼性の高い気密性が得られるとともに、この溶着部で引き抜け力が作用した際の互いの分離もある程度防止できる。しかしながら、過度に強い引き抜け力が作用した場合、樹脂被膜や樹脂チューブが配管の表面から剥がれる可能性もあり、アイジョイントと配管との接続構造の気密性が低下したり、アイジョイントと配管との離脱を生じる虞があった。
【０００７】
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、樹脂の溶着によりアイジョイントと配管とを接続可能とし、アイジョイントと配管との接続を容易に行う事を可能とするとともに、この接続構造に信頼性の高い気密性と高い耐引き抜け力を得ようとするものである。また、アイジョイントと配管との接続を容易で安全な方法により行い、作業環境への悪影響を防いで、人体への安全性も確保する。また、この信頼性の高い気密性と耐引き抜け力を有するアイジョイントを、簡易な構造で容易に製造可能とし、生産性を向上させる。
【０００８】
【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、第１の発明は、軸芯部にアイボルトの取付孔を貫通形成しこの取付孔と連通する流通路を、取付孔の軸芯と直交方向に設けたアイジョイント本体と、このアイジョイント本体の外表面に一体に設けられて前記取付孔の軸芯と直交方向に配置し流通路と連通する枝管とから成り、このアイジョイント本体の枝管に配管を挿入接続可能とするとともに、この配管の挿入部の外周面及びこの外周面と接触する枝管の内周面を樹脂製とし、前記挿入部の先端から所望の間隔を介して配管の外周に形成した環状膨出部に係合して配管の抜け止め手段となす係合爪を、枝管の内面に枝管と一体又は別体に形成し、前記枝管の内周面の樹脂と配管の外周面の樹脂とを溶着手段により溶着固定可能としたアイジョイントである。
【０００９】
また、第２発明は、軸芯部にアイボルトの取付孔を貫通形成しこの取付孔と連通する流通路を、取付孔の軸芯と直交方向に設けたアイジョイント本体に、前記取付孔の軸芯と直交し流通路と連通する枝管をアイジョイント本体と一体に設け、このアイジョイント本体の枝管に配管を挿入接続可能とし、この配管を、枝管への挿入部の外周面を樹脂製とするとともに、この挿入部の先端から所望の間隔を介した外周に環状膨出部を設けて形成し、この環状膨出部に係合して配管の抜け止め手段となす係合爪を枝管の内面に一体又は別体に形成するとともに、配管の挿入部の外周面と接触する枝管の内周面を樹脂製とし、この枝管の内周面の樹脂と配管の外周面の樹脂とを溶着手段により溶着固定する、アイジョイントと配管との接続構造である。
【００１０】
また、第３発明は、アイジョイント本体の枝管内に、この枝管内への挿入部の外周面を樹脂製とし、この挿入部の先端から所望の間隔を介した外周に環状膨出部を設けた配管を挿入するとともに、この配管の環状膨出部に、枝管の内面に一体又は別体に形成した係合爪を係合して配管の抜け止め手段となす工程と、配管の挿入部の外周面と接触する枝管の内周面を樹脂製とした枝管の該樹脂と配管の外周面の樹脂とを溶着手段により溶着固定する工程とにより、アイジョイント本体と配管とを接続する、アイジョイントと配管との接続方法である。
【００１１】
また、第４発明は、軸芯部にアイボルトの取付孔を貫通形成しこの取付孔と連通する流通路を、取付孔の軸芯と直交方向に設けたアイジョイント本体と、このアイジョイント本体への接続側の外周面に環状膨出部を設けるとともにこの環状膨出部を含む外周面にモールディング成形により樹脂製の枝管を固定する事で抜け止め手段とした配管を形成し、この配管に固定した枝管を、アイジョイント本体の樹脂製とした溶着面に、取付孔の軸芯と直交方向で流通路と連通可能に、溶着手段により溶着固定する、アイジョイントと配管との接続構造である。
【００１２】
また、第５発明は、アイジョイント本体との接続側の外周面に環状膨出部を設けた配管の、環状膨出部を含む外周面に、モールディング成形により樹脂製の枝管を固定する事で配管の抜け止め手段となす工程と、前記配管に固定した枝管を、アイジョイント本体の樹脂製とした溶着面に、アイボルトの取付孔の軸芯と直交方向に流通路と連通可能に接触配置し、溶着手段によりアイジョイント本体に枝管を溶着固定する工程とにより、アイジョイント本体と配管とを接続する、アイジョイントと配管との接続方法である。
【００１３】
【作用】
本発明は上述の如く構成したものであり、第１、第２、第３発明のアイジョイントは、アイジョイント本体と枝管とを一体に成形している。このようなアイジョイントと、自動車用配管、各種機械・装置用配管、その他の配管とを接続する方法は、まず、アイジョイント本体と一体に設けた枝管内に、配管を挿入する。
この挿入により、配管の挿入部の外周面に配置した樹脂と枝管の内周面に配置した樹脂とが互いに接触するとともに、先端から所望の間隔を介して設けた配管の環状膨出部に、枝管の係合爪が係合し、枝管からの配管の抜けを防止可能な抜け止め手段をなすものとなる。
【００１４】
次に、配管の挿入部と枝管との接触部に、枝管の外面から適宜の溶着手段を加えると、該挿入部の外周面の樹脂と枝管の内周面の樹脂とが溶着固定され、アイジョイント本体と配管との接続作業が完了する。このように、アイジョイントと配管とを樹脂の溶着により接続するので、アイジョイント本体と配管との接続構造に、信頼性の高い気密性を得る事ができる。また、この樹脂による溶着だけでも、アイジョイントと配管との互いの離脱を防止可能であるが、前記係合爪と環状膨出部との係合による抜け止め手段によって、耐引き抜け力が向上し、アイジョイントと配管との離脱を効果的に防止可能となる。また、この係合爪による優れた耐引き抜け力により、配管の軸方向への移動も防止し、更にアイジョイントの枝管と配管との溶着部の剥離も防止して、信頼性の高い気密性を持続可能となる。従って、アイジョイントを介して直交方向に連結される配管と基体とは、漏洩等のない、円滑な流体の流動が可能となる。
【００１５】
尚、上記枝管の樹脂と配管の樹脂との溶着手段として、超音波振動加熱溶着、高周波誘導加熱溶着等の方法を用いれば、枝管と配管との接続部分にのみ超音波や高周波のエネルギーを与えて加工する事が可能となり、過剰な高温化等を防いで、接続作業を安全かつ容易に行う事ができる。そして、超音波や高周波により樹脂が溶融或いは半溶融状態と成った際に、枝管の外部から接続部分を加圧する事により、枝管の内周面の樹脂と配管の外周面の樹脂との溶着を強固とし、より高い耐久性を持たせる事ができる。
【００１６】
また、枝管の内周面と配管の外周面とは、互いの接触部全体を樹脂製としても良いし、接触部の一部のみを樹脂製としても良い。また、枝管の内周面の樹脂と配管の外周面の樹脂との溶着の際も、互いの接触部の樹脂全体を溶着しても良いし、接触部の樹脂の一部のみを溶着しても良い。
【００１７】
このように、アイジョイントの枝管に配管を挿入して溶着手段を加えるだけで、信頼性の高い気密性と耐引き抜け力を持つ接続が可能となり、熟練技術を必要とする事がなく、接続作業の効率を向上させる事ができる。また、ろう付けを行わないので、亜鉛メッキや樹脂被膜等の防錆処理済みの配管を使用する事ができ、接続後の防錆処理の工程を省く事ができるとともに、作業環境や人体に影響のある物質を使用したり、有害ガス等が発生する事もなく、安全な作業が可能となる。また、配管との気密性と耐引き抜け力に優れた接続が可能なアイジョイントを、枝管の内周面を樹脂製とし、係合爪を設けただけの簡易な構造で形成でき、アイジョイントの生産性も向上させることができる。
【００１８】
また、係合爪を設けた抜け止め手段は、成形時に枝管と一体に形成しても良いが、抜け止め手段を、枝管の本体と別個に形成すれば、枝管を設けたアイジョイント本体の金型を単純化して、生産性を向上させる事ができる。また、抜け止め手段の金型を別個に形成するので、係合爪の成形後の金型からの取り外しが容易となり、係合爪を設けた抜け止め手段の容易な形成が可能となるとともに、製作精度も高める事ができる。そして、この別個に形成した抜け止め手段を、枝管の一側に、溶着手段により溶着固定するか又は部品同志の嵌合等により接続固定すれば良く、枝管と抜け止め手段との接続作業も容易となる。
【００１９】
また、別個に形成した枝管と抜け止め手段とを、樹脂の溶着固定にて接続する場合は、互いの溶着部の外周に、樹脂を溶着シールすれば、枝管と抜け止め手段との接続強度や気密性が向上し、抜け止め手段の耐引き抜け力の信頼性を更に高める事ができる。
【００２０】
また、前記配管は、環状膨出部を設けた金属製の配管とし、この金属製の配管の外周面に、枝管との溶着を可能とするため、樹脂チューブ又は樹脂被膜を密着配置したものであっても良い。また、金属製の配管全体を樹脂被膜又は樹脂チューブで被覆した製品が、低コストで一般に提供されているので、このような配管を用いれば、経済性が向上し、樹脂被膜又は樹脂チューブを、枝管との溶着手段として使用でき、アイジョイント本体と配管との接続作業を容易に行う事ができ、同時に樹脂による金属製の配管の優れた防錆効果も得られる。
【００２１】
しかしながら、必ずしも金属製の配管の外周面全体に樹脂チューブ又は樹脂被膜を密着配置する必要はなく、枝管の内周面の樹脂と接触し、互いに溶着可能であれば、配管の挿入部の外周面のみに樹脂チューブ又は樹脂被膜を配置しても良いし、配管の先端付近のみに配置する等、挿入部の外周面の一部のみに配置するものであっても良い。また、枝管に於いても、配管の挿入部の外周面に配置した樹脂と接触し、互いに溶着可能であれば、枝管の内周面全体を樹脂製としても良いし、内周面の一部のみを樹脂製としても良い。また、金属製の配管に樹脂チューブ又は樹脂被膜を密着配置する際は、溶着や接着剤の使用等で、配管と樹脂とが容易に分離不能に接着されたものを使用する。
【００２２】
また、樹脂製の配管を用いれば、アイジョイントの枝管との溶着を容易かつ強い接続力で行う事が可能となる。そして、この樹脂製の配管の挿入部の内周面に、金属チューブを配置し、この金属チューブを含む樹脂製の配管の外周に環状膨出部を設ければ、係合爪を係合する環状膨出部の強度が増し、信頼性の高い耐引き抜け力を得る事ができる。
【００２３】
また、他の異なる第４、第５発明に於いて、アイジョイントはアイジョイント本体と枝管とを別個に形成し、接続工程にて双方を溶着固定するもので、アイジョイント本体は、枝管を溶着する溶着面を少なくとも樹脂製としている。このようなアイジョイントと配管とを接続する第１の工程では、まず、配管のアイジョイント本体との接続側の外周面に、環状膨出部を突設し、この環状膨出部を含む配管の外周面に、モールディング成形により樹脂製の枝管を固定形成する。
【００２４】
この配管への枝管の固定形成により、配管と枝管とを強固に接続可能となり、配管と枝管との接続部に信頼性の高い気密性を得る事ができる。また、枝管の樹脂に配管の環状膨出部を埋設する事で、枝管と配管との互いの離脱を防止可能な信頼性の高い耐引き抜け力を持つ抜け止め手段が得られる。
【００２５】
そして、次工程では、アイジョイント本体の樹脂製とする溶着面に、アイボルトの取付孔の軸芯と直交方向で流通路と連通可能に枝管を接触配置する。この接触部に溶着手段を加える事により、アイジョイント本体の側面に枝管が溶着固定され、該枝管を介してアイジョイントと配管との接続が完了する。従って、第４、第５発明でも、アイジョイントと配管との安全で容易な接続作業が可能となり、この接続構造に、信頼性の高い気密性と耐引き抜け力を得る事ができる。
【００２６】
また、上記第４、第５発明では、アイジョイント本体と枝管との溶着固定後、互いの溶着面の外周に、樹脂を溶着シールすれば、アイジョイント本体と枝管との接続強度が高まり、アイジョイント本体と枝管との分離を防ぎ、アイジョイントと配管との耐引き抜け力だけでなく、気密性に対する信頼性も向上する。
【００２７】
また、上記第４、第５発明に於いても、前記第１、第２、第３発明と同様に、外周面に樹脂被膜又は樹脂チューブを密着配置した金属製の配管を用いても良いし、枝管への挿入部の内周面に金属チューブを配置した樹脂製の配管を用いても良く、これらの樹脂が枝管の樹脂と溶着され、枝管と配管とのより強固な接続が可能となる。しかし、この第４、第５発明は、配管の外周に枝管をモールディング加工により固定形成する方式であるから、外周面に何ら樹脂を配置していない金属製の配管を用いる事もでき、信頼性の高い気密性や耐引き抜け力を持つ接続構造を低コストで実施可能となるとともに、この接続構造及び接続方法を、あらゆる種類の配管で実施する事が可能な汎用性が得られる。
【００２８】
【実施例】
以下、本発明の実施例を図面に於て説明すれば、図１、図２は、本発明を自動車の流体供給機構に実施した第１実施例で、アイジョイントと一体に形成した枝管と配管とを溶着するものであり、図３、図４は、配管の先端をテーパー状とした第２実施例である。また、図５に示す第３実施例は、係合爪を設けた抜け止め手段を枝管と別個に形成し、抜け止め手段を枝管に溶着固定するもので、図６に示す第４実施例は、枝管とは別個に係合爪を設けたクリップ部材を形成し、このクリップ部材を枝管に嵌合により接続するものである。また、図７、図８に示す第５実施例は、枝管を配管にモールディング成形により固定し、枝管とアイジョイント本体とを溶着固定するものである。
【００２９】
まず、図１、図２に示す第１実施例を詳細に説明すれば、（１）は金属製の配管で、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、オイル配管等である。これらの配管（１）は、自動車用の燃料、エアー、潤滑油等を流通する基体（２４）から、直交方向に分岐して前記パネル側に配設されている。
【００３０】
上記配管（１）は、金属製の素管の外周面（２）全体を、好ましくは下地のメッキ被膜上を樹脂被膜（９）で被覆し、アイジョイント（３）に挿入接続可能とする挿入部（４）には、先端から所望の間隔を介した外周に、環状膨出部（５）を突設するとともに、先端から環状膨出部（５）付近までの外径を略同一な平滑なものとしている。また、配管（１）の樹脂被膜（９）は、アイジョイント（３）と配管（１）との接続工程で配管（１）に施すものであっても良いが、本実施例では、全長にわたり樹脂被膜（９）で被覆済みの既製の配管（１）を使用している。この既成の配管（１）の樹脂被膜（９）を、後述のアイジョイント（３）との溶着用の樹脂として使用できるので、本発明の接続工程での配管（１）への樹脂の配置の手間を省くと同時に、配管（１）の防錆効果を得る事ができる。
【００３１】
一方、上記配管（１）を接続するアイジョイント（３）は、全体を樹脂で一体成形し、図１、図２に示す如く、円筒形のアイジョイント本体（６）の軸芯部に、図１に２点鎖線で示すアイボルト（１７）を接続可能な取付孔（８）を貫通形成し、この取付孔（８）と連通する流通路（２６）を、取付孔（８）の軸芯と直交方向に開口している。また、アイジョイント本体（６）の内部には、取付孔（８）と同軸に流通路（２６）と連通する環状凹溝（７）を設け、この環状凹溝（７）を介して流通路（２６）とアイボルト（１７）の内部に設けたボルト内連通路（２７）と連通可能とし、前記流通路（２６）とボルト内連通路（２７）間の流体の流通を可能としている。
【００３２】
また、アイジョイント本体（６）の側面には、取付孔（８）の軸芯と直交方向で流通路（２６）と連通可能に、円筒状の枝管（１０）を一体に突出形成し、この枝管（１０）の端部に設けた挿入口（１１）を介して枝管（１０）内に、前記配管（１）の挿入部（４）を挿入接続可能としている。そして、枝管（１０）は、図１、図２に示す如く、アイジョイント本体（６）側に、挿入部（４）の平滑な先端側を密着挿入可能とするため、内周面（１２）の内径を配管（１）の外径と略同一とする密着部（１３）を配置し、この密着部（１３）に連なって、配管（１）の環状膨出部（５）を配置可能に内周面（１２）を大径とするとともに、配管（１）の抜け止め手段を設けた抜け止め部（１４）を配置している。
【００３３】
上記抜け止め部（１４）は、外周に一対の切欠部（１５）を設け、この切欠部（１５）の挿入口（１１）側の基部から抜け止め部（１４）の内部方向に、逆テーパー状に係合爪（１６）を配置し、この係合爪（１６）を配管（１）の環状膨出部（５）の背面に係合可能としている。そして、上記密着部（１３）と抜け止め部（１４）とから成る枝管（１０）を、樹脂にてアイジョイント本体（６）と一体に成形する事で、アイジョイント（３）の加工成形を容易とし、製造コストも抑えて、生産性の向上を可能とするとともに、以下の第２工程に示す配管（１）との溶着作業を、容易なものとしている。
【００３４】
上記第１実施例のアイジョイント（３）と配管（１）を接続する第１工程では、図２に示す如く、挿入口（１１）を介して枝管（１０）内に配管（１）の挿入部（４）を挿入すると、環状膨出部（５）が係合爪（１６）に当接する。そして、環状膨出部（５）にて係合爪（１６）を外方に弾性変形させながら挿入部（４）を更に挿入すると、環状膨出部（５）が係合爪（１６）を乗り越え、この係合爪（１６）が復元して先端面を環状膨出部（５）の背面に係合するとともに、挿入部（４）の先端側が枝管（１０）の密着部（１３）内に挿入配置される。前記係合爪（１６）と環状膨出部（５）との係合により、枝管（１０）と配管（１）と互いの離脱を良好に防止可能な耐引き抜け力を有する抜け止め手段が得られるものとなる。
【００３５】
また、配管（１）の環状膨出部（５）が係合爪（１６）を乗り越えた際の反動、又は環状膨出部（５）や係合爪（１６）の成形の際の多少の製作誤差で、環状膨出部（５）の背面と係合爪（１６）の先端面との間に、隙間を生じる事がある。このままの状態で次工程の樹脂の溶着を行うと、過度に強い引き抜け力が作用した際に配管（１）が抜け方向に移動し、枝管（１０）との溶着部に於いて配管（１）の金属から樹脂が剥離し、気密性を損なう虞がある。従って、上記隙間を生じた場合には、配管（１）を抜け方向に後退させ、環状膨出部（５）を係合爪（１６）に確実に当接させるか又は、配管（１）を後退させずに、環状膨出部（５）と係合爪（１６）との隙間に、この隙間を閉塞可能な適宜のスぺーサーを介在させても良い。このように、係合爪（１６）や環状膨出部（５）の形成位置等に多少の製作誤差を生じても、気密性や抜け止め効果を損なう事がなく、アイジョイント（３）や配管（１）の成形及び接続作業に高度な製作精度を必要とせず、低コストで容易な実施が可能となる。
【００３６】
次に第２工程では、枝管（１０）の内周面（１２）と配管（１）の外周面（２）との接触部の樹脂を互いに溶着するが、本実施例では、接触部の樹脂全体を溶着せず、配管（１）の先端付近のみの樹脂を溶着している。この溶着のため、図１に示す如く、挿入部（４）の挿入後、密着部（１３）の外周に高周波誘電コイル（１８）を配置し、高周波電磁誘導により配管（１）の金属を発熱させ、この熱で配管（１）の先端付近の外周面（２）の樹脂被膜（９）を溶融又は半溶融状態とする。
【００３７】
この溶融状態で密着部（１３）の外表面から加圧する事により、密着部（１３）の樹脂と挿入部（４）の先端側の樹脂被膜（９）とが溶着固定され、アイジョイント（３）と配管（１）との接続作業が完了する。そして、樹脂の溶着による接続なので、この接続構造に信頼性の高い気密性を持たせる事ができるとともに、耐引き抜け力も更に向上するものとなる。
【００３８】
また、本実施例では、溶着手段として、高周波誘導加熱溶着を行っているが、超音波振動加熱溶着等で行っても良い。また、枝管（１０）と配管（１）との溶着も、密着部（１３）の内周面（１２）と挿入部（４）の外周面（２）との接触部の樹脂全体を溶着するものであっても良いし、密着部（１３）での溶着だけでなく、更に係合爪（１６）の先端面と環状膨出部（５）との接触部の樹脂を溶着しても良い。
【００３９】
このように、本発明のアイジョイント（３）と配管（１）との接続構造は、信頼性の高い気密性と耐引き抜け力が得られるから、液体漏れやエアー漏れ等を良好に防止し、アイジョイント（３）を介して配管（１）とこの配管（１）の取り付け先の基体（２４）間での、燃料、エアー、潤滑油等の円滑な流通が可能となる。また、廉価な樹脂を用いて容易な加工方法でアイジョイント（３）を製造する事ができるとともに、アイジョイント（３）と配管（１）との接続も、樹脂の溶着による簡易な技術で行う事ができ、生産性を向上させる事ができる。また、ろう付けを行う必要がないので、環境や人体への安全性にも優れた作業が可能となる。
【００４０】
次に、図３、図４に示す第２実施例について詳細に説明すれば、上記第１実施例では、配管（１）の先端から環状膨出部（５）までの外径を同一としているが、本第２実施例では、配管（１）の先端側を縮径して、先端を最小径とするテーパー部（２０）を設けている。また、このテーパー部（２０）に対応して、枝管（１０）の密着部（１３）の内周面（１２）もテーパー状としている。このテーパー状の内周面（１２）に配管（１）のテーパー部（２０）を挿入するので、挿入部（４）の先端側と密着部（１３）との位置合わせ、及び環状膨出部（５）と係合爪（１６）との位置合わせが容易でより正確なものとなり、挿入完了後は枝管（１０）の内周面（１２）からのテーパー部（２０）への面圧を高く保つ事ができ、環状膨出部（５）を確実に係合爪（１６）に当接させ、良好な係合状態を維持する事ができる。
【００４１】
また、第１実施例では、配管（１）の挿入後に高周波誘導加熱により配管（１）と枝管（１０）との樹脂を溶着しているが、第２実施例では、図４に示す如く、配管（１）の挿入部（４）を枝管（１０）内に挿入しながら、高周波誘導により配管（１）の金属を発熱させている。この熱により挿入部（４）が通過する密着部（１３）の内周面（１２）全体の樹脂が溶融又は半溶融状態となり、挿入部（４）の挿入完了後は挿入部（４）の外周面（２）と密着部（１３）の内周面（１２）との接触面全体の樹脂が溶着され、より信頼性の高い気密性が得られ、耐引き抜け力も向上する。
【００４２】
また、第１実施例では、アイジョイント本体（６）の内部に環状凹溝（７）を設け、この環状凹溝（７）を介してアイジョイント本体（６）の流通路（２６）とアイボルト（１７）のボルト内連通路（２７）とを連通可能としているが、第２実施例では、図３、図４に示す如く、アイジョイント本体（６）の内部は取付孔（８）のみ形成し、アイボルト（１７）の外周に環状凹溝（２８）を設ける事により、流通路（２６）とボルト内連通路（２７）との連通を可能としている。
【００４３】
また、上記第１、第２実施例では、外周面（２）全体又は一部を樹脂被膜（９）で被覆した金属製の配管（１）を使用しているが、他の異なる実施例として、亜鉛メッキ等で防錆処理を施した金属製の配管（１）を使用し、この配管（１）の環状膨出部（５）を含む先端部側の外周面に、内面コンパウンド付き樹脂チューブを装着しても良い。この樹脂チューブは、熱収縮性を有する樹脂を用い、配管（１）への装着後に加熱する事により収縮させ、配管（１）の外表面に、容易に分離不能に密着固定させる。この樹脂チューブを配管（１）に固定する手段は、他の適宜の溶着手段を用いても良いし、接着剤を塗布する等の手段を用いても良い。この配管（１）の外周面（２）に配置した樹脂チューブと枝管（１０）の内周面（１２）の樹脂とを溶着する事により、配管（１）とアイジョイント（３）とを、優れた気密性で接続する事ができる。
【００４４】
また、上記第１、第２実施例では、アイジョイント本体（６）を、樹脂のみで形成しているが、他の異なる実施例として、アイジョイント本体（６）の内表面全体に、補強部材として鋼板を接着配置する等、樹脂以外の部材を使用しても良く、アイジョイント（３）の耐久性を向上させ、過度の歪みや変形を防止して、気密性の長期の保持を可能とする事ができる。
【００４５】
次に、第３、第４実施例を詳細に説明すれば、まず、アイジョイント（３）は、ポリアミド等のエンジニアリングプラスチック（以下、エンプラと言う）で形成する事により、形状安定性が優れたものとなるが、係合爪（１６）は、アイジョイント（３）の内部方向にテーパー状となり、逆テーパー形状を呈している。そのため、この逆テーパー形状の係合爪（１６）をアイジョイント本体（６）と同一の型枠で成形しようとすると、逆テーパー部分が型から抜けにくくなる等、成形の困難さを生じ易い。そのため、図５に示す第３実施例及び図６に示す第４実施例では、係合爪（１６）をアイジョイント本体（６）とは別個に形成し、各部材の容易な成形を可能としている。
【００４６】
まず、図５に示す第３実施例では、枝管（１０）の密着部（１３）のみアイジョイント本体（６）と一体に成形するが、抜け止め部（１４）はアイジョイント本体（６）と別個に成形するとともに、この抜け止め部（１４）に係合爪（１６）を一体に成形している。そして、各々の成形後に、密着部（１３）の側面に抜け止め部（１４）を溶着固定する。このように、係合爪（１６）を持つ抜け止め部（１４）を別個に成形する事により、第１、第２実施例に比べて、アイジョイント本体（６）の型枠が単純化し、アイジョイント本体（６）の加工性が向上するとともに、抜け止め部（１４）に設ける係合爪（１６）自体の加工も容易となり、アイジョイント（３）の成形時の作業効率及び工作精度を高める事ができる。
【００４７】
また、図６に示す第４実施例では、係合爪（１６）を設けずに枝管（１０）をアイジョイント本体（６）と一体に形成し、該枝管（１０）の抜け止め部（１４）は、切欠部（１５）を開口した円筒形に形成する。そして、枝管（１０）を設けたアイジョイント本体（６）とは別個に、係合爪（１６）を設けたクリップ部材（２１）を形成する。そして、このクリップ部材（２１）を、図６に示す如く、挿入口（１１）を介して抜け止め部（１４）内に差し込み、係合爪（１６）の後端側壁面（２５）を抜け止め部（１４）に開口した切欠部（１５）の基部に係合する事により、抜け止め部（１４）にクリップ部材（２１）を嵌合している。
【００４８】
従って、第４実施例では、アイジョイント本体（６）と別個のクリップ部材（２１）に係合爪（１６）を設ける事で、アイジョイント本体（６）は、逆テーパー形状の無い容易な成形が可能となり、低コストな実施が可能となる。また、クリップ部材（２１）は、枝管（１０）と同一のエンプラ樹脂等で形成しても良いし、係合爪（１６）を型から抜き易い他の樹脂で形成しても良いし、金属板を折曲して形成しても良く、何れの場合でも係合爪（１６）を容易にかつ高精度に形成可能となる。
【００４９】
次に、第５実施例を図７、図８にて詳細に説明すれば、上記第１〜第４実施例では、アイジョイント（３）の成形時に、アイジョイント本体（６）と、枝管（１０）の全部又は一部を一体に成形しているが、第５実施例では、枝管（１０）は、アイジョイント本体（６）とは別個に、配管（１）と一体に形成し、後工程で枝管（１０）とアイジョイント本体（６）とを溶着固定するものである。
【００５０】
まず、第１工程では、図８に示す如く、金属製の配管（１）の外周面に、先端から所望の間隔を介して環状膨出部（５）を突設する。この金属製の配管（１）は、外周面（２）に亜鉛メッキ等の防錆処理を施して、防錆性を持たせても良い。そして、この環状膨出部（５）を含む配管（１）の挿入部（４）の外周面（２）に、モールディング成形により樹脂製の枝管（１０）を円筒状に固定形成する。このモールディング成形により配管（１）に枝管（１０）を設けるので、配管（１）の外周面（２）を必ずしも樹脂製としなくても、枝管（１０）と配管（１）とを分離不能に、かつ信頼性の高い気密性で接続可能となる。また、枝管（１０）の樹脂に環状膨出部（５）を埋設する事で、枝管（１０）と配管（１）との耐引き抜け力が高い抜け止め手段が得られる。
【００５１】
次に、第２工程では、図７に示す如く、アイジョイント本体（６）の側面の樹脂製とする溶着面（２３）に、アイボルト（１７）と直交方向で枝管（１０）の先端面を接触配置する。この接触部に、超音波振動加熱溶着、高周波誘導加熱溶着等の溶着手段を加え、アイジョイント本体（６）と枝管（１０）とを溶着固定する。
【００５２】
このアイジョイント本体（６）と枝管（１０）との溶着固定により、アイジョイント（３）と配管（１）との接続が完了するが、第５実施例では更に、図７に示す如く、この溶着部の外周に樹脂を溶着してシール部（２２）を設けている。このシール部（２２）の溶着も、超音波振動加熱溶着や、高周波誘導加熱溶着で容易に行う事ができる。このようにシール部（２２）を設ける事により、アイジョイント本体（６）と枝管（１０）との接続強度が更に高まり、気密性及び耐引き抜け力に対する信頼性を、より向上させる事が可能となる。
【００５３】
このように、第５実施例の如く、アイジョイント本体（６）と枝管（１０）とを別個に成形し、後工程で双方を溶着固定する方法でも、アイジョイント（３）と配管（１）との接続構造に、信頼性の高い気密性と耐引き抜け力を持たせる事ができるし、枝管（１０）の構造が単純となり、係合爪（１６）を設ける等の手間を必要とせず、生産性が向上するとともに、作業環境や人体にも安全な作業が可能である。
【００５４】
また、上記第５実施例では、枝管（１０）をモールディング成形により配管（１）に固定するので、外周面（２）に何ら樹脂を配置してない金属製の配管（１）を使用しているが、外周面（２）全体又は挿入部（４）の外周面（２）に樹脂被膜（９）や樹脂チューブを密着配置した金属製の配管（１）を使用しても良いし、環状膨出部（５）を含む内周面に、金属チューブを配置した樹脂製の配管（１）を使用しても良い。
これらの配管（１）では、外周面（２）に配置した樹脂と枝管（１０）の樹脂とが溶着するので、配管（１）と枝管（１０）との一体性を高める事ができる。
【００５５】
【発明の効果】
本発明は上述の如く構成したもので、自動車用配管、各種機械・装置用配管、その他の配管とアイジョイントとの接続を、アイジョイントの枝管の内周面に配置した樹脂と配管の外周面に配置した樹脂との溶着で行うか又は配管にモールディング成形した枝管をアイジョイントに溶着して行っているので、配管とアイジョイントとの接続構造に、信頼性の高い気密性を得る事ができる。また、アイジョイントの枝管に、配管の抜け止め手段を設けているので、配管とアイジョイントとの互いの離脱を防止可能な優れた耐引き抜け力を得る事ができる。
【００５６】
従って、流体の流れ方向が互いに直交する配管と基体間で、アイジョイントを介して漏洩等のない円滑な流体の流動が可能となる。また、配管とアイジョイントとの接続は、金属によるろう付けではなく樹脂の溶着により行うので、熟練技術や多くの工数を必要とせず、容易な方法で行う事ができ、作業環境や人体への影響も防ぐ事ができる。そして、アイジョイントの製造及び配管との接続作業を効率的に行って、生産性を向上させる事ができる。
【図面の簡単な説明】
【図１】本発明の第１実施例のアイジョイントと配管との接続構造の断面図。
【図２】第１実施例に於いて、枝管への配管の挿入過程を示す断面図。
【図３】第２実施例の断面図で、配管の先端にテーパー部を設けたものである。
【図４】第２実施例に於いて、枝管への配管の挿入過程を示す断面図。
【図５】第３実施例の断面図で、抜け止め部を枝管の本体とは別個に形成したものである。
【図６】第４実施例の断面図で、抜け止め部の本体とは別個のクリップ部材に係合爪を形成したものである。
【図７】第５実施例の断面図で、モールディング成形により配管に固定した枝管をアイジョイント本体に溶着固定したものである。
【図８】第５実施例に於いて、配管に固定した枝管とアイジョイント本体との溶着前の状態の断面図。
【符号の説明】
１　配管
２　外周面
３　アイジョイント
４　挿入部
５　環状膨出部
６　アイジョイント本体
８　取付孔
９　樹脂被膜
１０　枝管
１２　内周面
１６　係合爪
１７　アイボルト
２６　流通路[0001]
[Industrial applications]
The present invention relates to an eye joint for mounting automotive piping, piping for various machines and devices, and other piping orthogonally to a base, a connection structure between the eye joint and the piping, and a connection method thereof. The connection between the eye joint and the pipe is made inexpensively by an easy connection method, and the highly reliable airtightness and pull-out resistance between the eye joint and the pipe are obtained, and such an eye joint can be easily formed. is there.
[0002]
[Prior art]
Conventionally, when laying pipes for automobiles, pipes for various machines and equipment, and other metal pipes, especially pipes for circulating fuel, air, lubricating oil, etc. for automobiles, on underfloor panels, front panels, etc. A metal eye joint is generally used as a joint for connecting the pipe orthogonally to the base. In this eye joint, for example, a branch pipe for inserting a pipe is formed on a side surface of a spherical eye joint body formed by cold forging a steel material in a direction orthogonal to the eye bolt. Then, the inside of the eye joint body and the inside of the branch pipe are machined to form a flow path for fuel and other fluids so that they can communicate with each other. The pipe was inserted into the branch pipe of the eye joint thus formed, and the tip of the branch pipe and the outer peripheral surface of the pipe were brazed to connect the eye joint and the pipe.
[0003]
[Problems to be solved by the invention]
However, according to the above-described conventional techniques, the processing of the eye joint and the connection to the piping require a complicated technique and a large number of man-hours due to skilled work, and the manufacturing cost is high. There is also a problem that the working environment and the human body are affected by the flux and the like used during the brazing operation. In addition, in the brazing operation, if a pipe that has been subjected to rust prevention treatment such as galvanizing is used, the galvanizing peels off due to heat during brazing. For this reason, it is necessary to use a pipe that has not been subjected to rust-prevention treatment and to perform a rust-prevention treatment such as galvanization after the brazing, thus further increasing the number of manufacturing steps.
[0004]
Further, as disclosed in Japanese Utility Model Publication No. Sho 60-5190, there is a product in which an eye joint is formed of a resin to simplify a processing operation. In this conventional technique, a flare-processed pipe is brought into contact with the sheet surface at the tip of the branch pipe, and then the branch pipe and the pipe are tightened from the outer periphery with a metal connection nut to connect the two. Therefore, no brazing was required for the connection between the eye joint and the pipe, and the rust-proofed pipe could be used, which was safe for the working environment and the human body. However, in this conventional technique, a metal screw ring is fusion-fixed to the outer circumference of the branch pipe. Therefore, in order for the pipe to abut on the sheet surface at the tip of the branch pipe, it is necessary to perform flare processing on the pipe and plastically deform it. Yes, it takes time and a lot of skills to manufacture piping. In addition, the number of components is large, such as using a metal connection nut, and a large number of steps are required for assembling.
[0005]
Before the disclosure, in the invention of Japanese Patent Application No. 2001-303355 of the present applicant, the eye joint body is formed of a resin, and a resin coating or a resin tube is provided on the branch pipe of the resin-made eye joint body. A metal pipe closely attached to the pipe is inserted, and a resin film or a resin tube on the outer circumference of the pipe is welded and fixed to the resin of the branch pipe to connect the pipe to the eye joint body.
[0006]
By connecting these resins together by welding, highly reliable airtightness can be obtained in the connection structure between the eye joint and the piping, and separation when the pull-out force acts at this welded part. Can be prevented to some extent. However, if an excessively strong pull-out force is applied, the resin coating or the resin tube may be peeled off from the surface of the pipe, and the airtightness of the connection structure between the eye joint and the pipe may be reduced, or the eye joint and the pipe may not be connected. There is a fear that the separation may occur.
[0007]
The present invention is to solve the problems as described above, and enables connection of an eye joint and a pipe by welding of a resin, and enables easy connection between the eye joint and a pipe. The purpose is to obtain a highly reliable airtightness and a high pull-out resistance in the connection structure. In addition, the connection between the eye joint and the pipe is made in an easy and safe manner, preventing adverse effects on the working environment and ensuring safety for the human body. Further, the eye joint having the highly reliable airtightness and pull-out resistance can be easily manufactured with a simple structure, and the productivity is improved.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, an eyebolt mounting hole is formed through a shaft core portion and a flow passage communicating with the mounting hole is provided in a direction orthogonal to the axis of the mounting hole. An eye joint body, and a branch pipe integrally provided on the outer surface of the eye joint body and arranged in a direction orthogonal to the axis of the mounting hole and communicating with the flow passage. The pipe can be inserted and connected, and the outer peripheral surface of the insertion portion of the pipe and the inner peripheral surface of the branch pipe in contact with the outer peripheral surface are made of resin, and the outer periphery of the pipe is inserted at a desired distance from the tip of the insertion portion. An engaging claw that engages with the annular bulging portion formed as described above and serves as a pipe retaining means is formed integrally with or separately from the branch pipe on the inner surface of the branch pipe, and is formed with resin on the inner peripheral surface of the branch pipe. Eye join that can be welded and fixed to the resin on the outer peripheral surface of the pipe by welding means It is.
[0009]
In a second aspect of the present invention, an eye joint body in which a mounting hole for an eye bolt is formed through a shaft core portion and a flow passage communicating with the mounting hole is provided in a direction orthogonal to the axis of the mounting hole, the shaft of the mounting hole is provided. A branch pipe orthogonal to the core and communicating with the flow passage is provided integrally with the eye joint body, and a pipe can be inserted into and connected to the branch pipe of the eye joint body. In addition to the above, an engaging claw which is formed by providing an annular bulging portion on the outer periphery at a desired distance from the tip of the insertion portion and which is engaged with the annular bulging portion and serves as a pipe retaining means. In addition to being formed integrally or separately on the inner surface of the branch pipe, the inner peripheral surface of the branch pipe that is in contact with the outer peripheral surface of the pipe insertion portion is made of resin, and the resin on the inner peripheral surface of this branch pipe and the outer peripheral surface of the pipe are formed. This is a connection structure between the eye joint and the pipe, which fixes the resin by welding.
[0010]
According to a third aspect of the present invention, in the branch pipe of the eye joint body, an outer peripheral surface of an insertion portion into the branch pipe is made of resin, and an annular bulge is provided on an outer circumference of the insertion pipe at a desired distance from a tip of the insertion section. Inserting the inserted pipe into the annular bulging portion of the pipe and engaging an engaging claw formed integrally or separately with the inner surface of the branch pipe to form a pipe retaining means; Connecting the eye joint body and the pipe by welding and fixing the resin of the branch pipe having an inner peripheral surface made of resin and the resin of the outer peripheral surface of the pipe by welding means. And the connection method between the eye joint and the pipe.
[0011]
According to a fourth aspect of the present invention, there is provided an eye joint body in which a mounting hole for an eye bolt is formed through a shaft core portion and a flow passage communicating with the mounting hole is provided in a direction orthogonal to the axis of the mounting hole. An annular swelling portion is provided on the outer peripheral surface on the connection side of, and a pipe serving as a retaining means is formed by fixing a resin branch pipe by molding on the outer peripheral surface including the annular swelling section, and this pipe is formed. The connection structure between the eye joint and the pipe is fixed by welding means to the fixed branch pipe by welding means so that it can communicate with the flow path in the direction perpendicular to the axis of the mounting hole on the welding surface made of resin of the eye joint body. is there.
[0012]
According to a fifth aspect of the present invention, a resin branch pipe is fixed by molding to an outer peripheral surface including an annular bulge portion of a pipe having an annular bulge portion on an outer peripheral surface on a connection side with an eye joint body. And forming a branch pipe fixed to the pipe with a welding surface made of resin of the eye joint body so as to be able to communicate with the flow passage in a direction orthogonal to the axis of the mounting hole of the eye bolt. A method of connecting the eye joint and the pipe, wherein the step of disposing and welding and fixing the branch pipe to the eye joint body by the welding means connects the eye joint body and the pipe.
[0013]
[Action]
The present invention is configured as described above, and the eye joint of the first, second, and third inventions has an eye joint body and a branch pipe integrally formed. In a method of connecting such an eye joint to a pipe for a vehicle, a pipe for various machines and devices, and other pipes, first, a pipe is inserted into a branch pipe provided integrally with the eye joint body.
By this insertion, the resin disposed on the outer peripheral surface of the insertion portion of the pipe and the resin disposed on the inner peripheral surface of the branch pipe come into contact with each other, and the annular bulging portion of the pipe provided at a desired distance from the tip end. The engagement claws of the branch pipe are engaged with each other to form a retaining means capable of preventing the pipe from falling off the branch pipe.
[0014]
Next, when appropriate welding means is added from the outer surface of the branch tube to the contact portion between the insertion portion of the pipe and the branch tube, the resin on the outer peripheral surface of the insertion portion and the resin on the inner peripheral surface of the branch tube are welded and fixed. Then, the connection work between the eye joint body and the pipe is completed. As described above, since the eye joint and the pipe are connected by welding the resin, highly reliable airtightness can be obtained in the connection structure between the eye joint body and the pipe. Further, it is possible to prevent the eye joint and the pipe from separating from each other only by welding with the resin, but the pull-out resistance is improved by the retaining means by the engagement between the engaging claw and the annular bulging portion. In addition, the separation between the eye joint and the pipe can be effectively prevented. In addition, the excellent pull-out resistance of the engaging claw prevents the pipe from moving in the axial direction, and also prevents the welded part between the branch pipe of the eye joint and the pipe from peeling, thus providing a highly reliable airtight. Sex becomes sustainable. Therefore, the pipe and the base, which are connected in the orthogonal direction via the eye joint, can flow smoothly without leakage.
[0015]
If a method such as ultrasonic vibration heating welding or high-frequency induction heating welding is used as a means for welding the resin of the branch pipe and the resin of the pipe, the ultrasonic or high-frequency energy is applied only to the connection between the branch pipe and the pipe. The connection work can be performed safely and easily by preventing excessively high temperature and the like. Then, when the resin is melted or semi-molten by ultrasonic waves or high frequency, the connection portion is pressurized from the outside of the branch pipe, so that the resin on the inner peripheral surface of the branch pipe and the resin on the outer peripheral surface of the pipe are connected. The welding can be strengthened and higher durability can be provided.
[0016]
Also, the inner peripheral surface of the branch pipe and the outer peripheral surface of the pipe may be made entirely of resin, or only a part of the contact part may be made of resin. Also, when welding the resin on the inner peripheral surface of the branch pipe and the resin on the outer peripheral surface of the pipe, the entire resin at the contact portion of each other may be welded, or only a part of the resin at the contact portion may be welded. May be.
[0017]
In this way, by simply inserting the pipe into the branch pipe of the eye joint and adding welding means, a connection with high reliability and airtightness and pull-out resistance becomes possible, without requiring skill. The efficiency of the connection work can be improved. In addition, since brazing is not performed, rust-proof piping such as zinc plating and resin coating can be used, eliminating the need for a rust-proofing process after connection and affecting the working environment and the human body. Safe operation is possible without the use of toxic substances or the generation of harmful gases. In addition, an eye joint that can be connected to the pipe with excellent airtightness and pull-out resistance can be formed with a simple structure in which the inner peripheral surface of the branch pipe is made of resin and an engaging claw is provided. The productivity of the joint can also be improved.
[0018]
Further, the retaining means provided with the engaging claws may be formed integrally with the branch pipe at the time of molding. However, if the retaining means is formed separately from the main body of the branch pipe, an eye joint provided with the branch pipe is provided. The mold of the main body can be simplified, and the productivity can be improved. Further, since the mold of the retaining claw is formed separately, it is easy to remove the engaging claw from the mold after molding, and it is possible to easily form the retaining claw provided with the engaging claw. Manufacturing accuracy can be increased. Then, the separately formed retaining means may be welded and fixed to one side of the branch pipe by welding means or connected and fixed by fitting parts together, etc. Also becomes easier.
[0019]
Further, when the separately formed branch pipe and the retaining means are connected by welding and fixing the resin, if the resin is welded and sealed to the outer periphery of the welded portion, the connection between the branch pipe and the retaining means is established. Strength and airtightness are improved, and the reliability of the pull-out resistance of the retaining means can be further increased.
[0020]
Further, the pipe is a metal pipe provided with an annular bulging portion, and a resin tube or a resin film is closely attached to an outer peripheral surface of the metal pipe so as to be able to be welded to a branch pipe. It may be. In addition, products in which the entire metal pipe is coated with a resin coating or a resin tube are generally provided at low cost, so using such a pipe improves economical efficiency, and a resin coating or a resin tube is used. It can be used as a means for welding to the branch pipe, and the connection work between the eye joint body and the pipe can be easily performed, and at the same time, an excellent rust-preventing effect of the metal pipe made of resin can be obtained.
[0021]
However, it is not always necessary to arrange a resin tube or a resin film in close contact with the entire outer peripheral surface of the metal pipe. A resin tube or a resin coating may be disposed only on the surface, or may be disposed only on a part of the outer peripheral surface of the insertion portion, such as disposed only near the tip of the pipe. Also, in the branch pipe, the entire inner peripheral surface of the branch pipe may be made of resin as long as it comes into contact with the resin disposed on the outer peripheral surface of the insertion portion of the pipe and can be welded to each other. Only a part may be made of resin. When a resin tube or a resin film is placed in close contact with a metal pipe, a pipe that is easily and inseparably bonded to the resin by welding or use of an adhesive is used.
[0022]
In addition, if resin piping is used, welding to the branch pipe of the eye joint can be performed easily and with a strong connection force. Then, a metal tube is arranged on the inner peripheral surface of the insertion portion of the resin pipe, and if an annular bulge is provided on the outer periphery of the resin pipe including the metal tube, the engaging claw is engaged. The strength of the annular bulge is increased, and a highly reliable pull-out resistance can be obtained.
[0023]
Further, in another different fourth and fifth inventions, the eye joint forms the eye joint body and the branch pipe separately and welds and fixes them both in the connecting step. Is made of at least a resin. In the first step of connecting the eye joint and the pipe, first, an annular bulge is protruded from the outer peripheral surface of the pipe on the connection side with the eye joint body, and the pipe including the annular bulge is provided. A resin-made branch pipe is fixedly formed on the outer peripheral surface by molding.
[0024]
By fixing the branch pipe to the pipe, the pipe and the branch pipe can be firmly connected, and highly reliable airtightness can be obtained at the connection between the pipe and the branch pipe. Further, by burying the annular bulging portion of the pipe in the resin of the branch pipe, a highly reliable pull-out preventing means capable of preventing the branch pipe and the pipe from separating from each other can be obtained.
[0025]
In the next step, the branch pipe is placed in contact with the resin welding surface of the eye joint body so as to be able to communicate with the flow passage in a direction orthogonal to the axis of the mounting hole of the eye bolt. By adding welding means to this contact portion, the branch pipe is welded and fixed to the side surface of the eye joint body, and the connection between the eye joint and the pipe is completed via the branch pipe. Therefore, also in the fourth and fifth inventions, a safe and easy connection work between the eye joint and the pipe becomes possible, and a highly reliable airtightness and pull-out resistance can be obtained in this connection structure.
[0026]
In the fourth and fifth aspects of the present invention, if the resin is welded and sealed to the outer periphery of the welding surfaces of the eye joint body and the branch pipe after the welding and fixing of the eye joint body and the branch pipe, the connection strength between the eye joint body and the branch pipe is increased. This prevents separation of the eye joint body and the branch pipe, and improves not only the pull-out resistance of the eye joint and the pipe, but also the reliability of airtightness.
[0027]
Also, in the fourth and fifth inventions, similarly to the first, second, and third inventions, a metal pipe in which a resin film or a resin tube is closely attached to an outer peripheral surface may be used. Alternatively, resin piping in which a metal tube is disposed on the inner peripheral surface of the insertion portion into the branch pipe may be used, and these resins are welded to the resin of the branch pipe, and a stronger connection between the branch pipe and the pipe is obtained. It becomes possible. However, in the fourth and fifth inventions, since the branch pipe is fixedly formed on the outer circumference of the pipe by molding, it is possible to use a metal pipe in which no resin is disposed on the outer peripheral surface. A connection structure having high airtightness and pull-out resistance can be implemented at a low cost, and versatility can be obtained in which this connection structure and connection method can be implemented with all kinds of pipes.
[0028]
【Example】
1 and 2 show a first embodiment in which the present invention is applied to a fluid supply mechanism of an automobile. FIG. 1 and FIG. 2 show a branch pipe integrally formed with an eye joint. FIGS. 3 and 4 show a second embodiment in which the tip of the pipe is tapered. In the third embodiment shown in FIG. 5, a retaining means provided with an engaging claw is formed separately from the branch pipe, and the retaining means is welded and fixed to the branch pipe. The fourth embodiment shown in FIG. In the example, a clip member provided with an engagement claw separately from the branch pipe is formed, and this clip member is connected to the branch pipe by fitting. In the fifth embodiment shown in FIGS. 7 and 8, the branch pipe is fixed to the pipe by molding, and the branch pipe and the eye joint body are welded and fixed.
[0029]
First, the first embodiment shown in FIGS. 1 and 2 will be described in detail. (1) is a metal pipe which is disposed on an underfloor panel, a front panel, or the like, and supplies fuel from a fuel tank to an engine room. Fuel main pipe to be supplied, fuel return pipe to return excess fuel from the engine to the fuel tank, evaporative pipe to adsorb fuel vapor in the fuel tank to the canister in the engine room, and vacuum pipe to use negative pressure of intake air , Oil piping and the like. These pipes (1) are arranged on the panel side in a direction perpendicular to the base (24) through which fuel, air, lubricating oil, and the like for the vehicle flow.
[0030]
The pipe (1) is formed by covering the entire outer peripheral surface (2) of the metal pipe, preferably on a base plating film, with a resin film (9), and inserting and connecting to the eye joint (3). The portion (4) has an annular bulge (5) protruding from an outer periphery thereof at a desired distance from the tip and has a smooth outer diameter from the tip to the vicinity of the annular bulge (5). It is assumed that. The resin film (9) of the pipe (1) may be applied to the pipe (1) in the step of connecting the eye joint (3) and the pipe (1). A ready-made pipe (1) coated with a resin coating (9) is used. Since the resin coating (9) of the existing pipe (1) can be used as a resin for welding to an eye joint (3) described later, the arrangement of the resin on the pipe (1) in the connection step of the present invention is determined. At the same time, the rust prevention effect of the pipe (1) can be obtained.
[0031]
On the other hand, an eye joint (3) for connecting the pipe (1) is integrally formed of resin as a whole, and as shown in FIGS. 1 and 2, the eye joint (3) is attached to a shaft core of a cylindrical eye joint body (6). A mounting hole (8) that can be connected to an eyebolt (17) indicated by a two-dot chain line is formed through the mounting hole (1), and a flow passage (26) communicating with the mounting hole (8) is formed with a shaft core of the mounting hole (8). It is open in the orthogonal direction. Further, an annular groove (7) communicating with the flow passage (26) coaxially with the mounting hole (8) is provided inside the eye joint body (6), and the flow passage is formed through the annular groove (7). (26) and a communication passage (27) in the bolt provided inside the eye bolt (17), so that a fluid can flow between the flow passage (26) and the communication passage (27) in the bolt.
[0032]
A cylindrical branch pipe (10) is integrally formed on the side surface of the eye joint body (6) so as to be able to communicate with the flow passage (26) in a direction orthogonal to the axis of the mounting hole (8). The insertion portion (4) of the pipe (1) can be inserted and connected into the branch pipe (10) through an insertion port (11) provided at the end of the branch pipe (10). As shown in FIGS. 1 and 2, the branch pipe (10) has an inner peripheral surface (12) so that the smooth distal end of the insertion portion (4) can be closely inserted into the eye joint body (6). ) Is provided with a contact portion (13) having an inner diameter substantially equal to the outer diameter of the pipe (1), and an annular bulging portion (5) of the pipe (1) can be disposed following the contact portion (13). The inner peripheral surface (12) has a large diameter and a retaining portion (14) provided with a retaining means for the pipe (1).
[0033]
The retaining portion (14) is provided with a pair of notches (15) on the outer periphery, and has a reverse taper from the base of the notch (15) on the insertion port (11) side toward the inside of the retaining portion (14). An engaging claw (16) is arranged in a shape, and the engaging claw (16) can be engaged with the back surface of the annular bulging portion (5) of the pipe (1). Then, the branch pipe (10) composed of the above-mentioned close contact portion (13) and the retaining portion (14) is integrally formed with the eye joint body (6) by resin, thereby forming the eye joint (3). , The manufacturing cost is suppressed, the productivity can be improved, and the welding work with the pipe (1) shown in the following second step is made easy.
[0034]
In the first step of connecting the eye joint (3) and the pipe (1) of the first embodiment, as shown in FIG. 2, the pipe (1) is inserted into the branch pipe (10) through the insertion port (11). When the insertion portion (4) is inserted, the annular bulge (5) comes into contact with the engagement claw (16). When the insertion portion (4) is further inserted while the engaging claw (16) is elastically deformed outward by the annular bulging portion (5), the annular bulging portion (5) pushes the engaging claw (16). The engaging claw (16) is restored and the distal end face is engaged with the back surface of the annular bulging portion (5), and the distal end side of the insertion portion (4) is brought into close contact with the branch pipe (10) (13). Inserted and placed inside. With the engagement between the engaging claw (16) and the annular bulging portion (5), a pull-out preventing means having pull-out resistance capable of favorably preventing the branch pipe (10) and the pipe (1) from separating from each other. Is obtained.
[0035]
Also, a reaction when the annular bulging portion (5) of the pipe (1) gets over the engaging claw (16), or a slight reaction when the annular bulging portion (5) or the engaging claw (16) is formed. Due to a manufacturing error, a gap may be formed between the rear surface of the annular bulging portion (5) and the distal end surface of the engaging claw (16). If the resin is welded in the next step in this state, the pipe (1) moves in the pull-out direction when an excessively strong pull-out force is applied, and the pipe (1) is welded to the branch pipe (10) at the welded portion. There is a possibility that the resin is peeled off from the metal of 1) and the airtightness is impaired. Therefore, when the gap is generated, the pipe (1) is retracted in the pull-out direction, and the annular bulging portion (5) is reliably brought into contact with the engaging claw (16), or the pipe (1) is Instead of retreating, an appropriate spacer that can close this gap may be interposed in the gap between the annular bulging portion (5) and the engagement claw (16). As described above, even if a slight manufacturing error occurs in the formation position of the engagement claw (16) or the annular bulging portion (5), the airtightness and the retaining effect are not impaired. The high-precision manufacturing precision is not required for the forming and connecting work of the pipe (1), so that the pipe (1) can be easily implemented at low cost.
[0036]
Next, in the second step, the resin at the contact portion between the inner peripheral surface (12) of the branch pipe (10) and the outer peripheral surface (2) of the pipe (1) is welded to each other. The resin is welded only near the tip of the pipe (1) without welding the entire resin. Due to this welding, as shown in FIG. 1, after the insertion portion (4) is inserted, a high-frequency dielectric coil (18) is arranged on the outer periphery of the contact portion (13), and the metal of the pipe (1) is heated by high-frequency electromagnetic induction. Then, the resin coating (9) on the outer peripheral surface (2) near the tip of the pipe (1) is melted or semi-melted by this heat.
[0037]
By applying pressure from the outer surface of the contact portion (13) in this molten state, the resin of the contact portion (13) and the resin coating (9) on the tip end side of the insertion portion (4) are welded and fixed, and the eye joint (3) is fixed. ) Is connected to the pipe (1). And, since the connection is made by welding the resin, the connection structure can be provided with a highly reliable airtightness, and the pull-out resistance can be further improved.
[0038]
Further, in this embodiment, high-frequency induction heating welding is performed as the welding means, but ultrasonic vibration heating welding or the like may be used. Also, the welding between the branch pipe (10) and the pipe (1) is performed by welding the entire resin at the contact portion between the inner peripheral surface (12) of the contact portion (13) and the outer peripheral surface (2) of the insertion portion (4). Not only welding at the contact portion (13), but also resin at the contact portion between the tip surface of the engaging claw (16) and the annular bulging portion (5) may be welded. good.
[0039]
As described above, since the connection structure between the eye joint (3) and the pipe (1) of the present invention can obtain a highly reliable airtightness and pull-out resistance, it can prevent liquid leakage, air leakage, and the like satisfactorily. Through the eye joint (3), smooth flow of fuel, air, lubricating oil and the like between the pipe (1) and the base (24) to which the pipe (1) is attached becomes possible. Further, the eye joint (3) can be manufactured by an easy processing method using an inexpensive resin, and the connection between the eye joint (3) and the pipe (1) is performed by a simple technique by welding the resin. Can improve productivity. In addition, since it is not necessary to perform brazing, it is possible to perform work excellent in safety for the environment and the human body.
[0040]
Next, the second embodiment shown in FIGS. 3 and 4 will be described in detail. In the first embodiment, the outer diameter from the tip of the pipe (1) to the annular bulge (5) is the same. However, in the second embodiment, a tapered portion (20) is provided in which the diameter of the distal end side of the pipe (1) is reduced so that the distal end has a minimum diameter. The inner peripheral surface (12) of the contact portion (13) of the branch pipe (10) is also tapered in correspondence with the tapered portion (20). Since the tapered portion (20) of the pipe (1) is inserted into the tapered inner peripheral surface (12), the position of the distal end side of the insertion portion (4) and the contact portion (13) are adjusted, and the annular bulging portion is formed. The alignment between the (5) and the engaging claw (16) is easy and more accurate, and after the insertion is completed, the surface pressure from the inner peripheral surface (12) of the branch pipe (10) to the tapered portion (20) is obtained. Can be kept high, and the annular bulge (5) can be reliably brought into contact with the engagement claw (16), and a good engagement state can be maintained.
[0041]
Further, in the first embodiment, the resin between the pipe (1) and the branch pipe (10) is welded by high-frequency induction heating after the insertion of the pipe (1). In the second embodiment, as shown in FIG. While the insertion portion (4) of the pipe (1) is inserted into the branch pipe (10), the metal of the pipe (1) is heated by high-frequency induction. The heat causes the resin on the entire inner peripheral surface (12) of the contact portion (13) through which the insertion portion (4) passes to be in a molten or semi-molten state, and after the insertion of the insertion portion (4) is completed, the resin of the insertion portion (4) is removed. The resin on the entire contact surface between the outer peripheral surface (2) and the inner peripheral surface (12) of the contact portion (13) is welded, so that more reliable airtightness is obtained and the pull-out resistance is improved.
[0042]
In the first embodiment, an annular groove (7) is provided inside the eye joint body (6), and the flow passage (26) of the eye joint body (6) and the eyebolt are provided through the annular groove (7). Although it is possible to communicate with the communication passage (27) in the bolt (17), in the second embodiment, as shown in FIGS. 3 and 4, only the mounting hole (8) is formed inside the eye joint body (6). By providing an annular groove (28) on the outer periphery of the eye bolt (17), communication between the flow passage (26) and the bolt communication passage (27) is enabled.
[0043]
In the first and second embodiments, the metal pipe (1) in which the whole or a part of the outer peripheral surface (2) is covered with the resin coating (9) is used. Using a metal pipe (1) that has been rust-proofed by zinc plating or the like, a resin tube with an internal compound is provided on the outer peripheral surface of the pipe (1) including the annular bulge (5) at the tip end side. May be attached. The resin tube is made of a heat-shrinkable resin, and is shrunk by being heated after being attached to the pipe (1), so that the resin tube is easily and inseparably fixed to the outer surface of the pipe (1). As a means for fixing the resin tube to the pipe (1), other appropriate welding means may be used, or a means such as applying an adhesive may be used. By welding the resin tube arranged on the outer peripheral surface (2) of the pipe (1) and the resin on the inner peripheral surface (12) of the branch pipe (10), the pipe (1) and the eye joint (3) are connected. , Can be connected with excellent airtightness.
[0044]
Further, in the first and second embodiments, the eye joint body (6) is formed only of resin. However, as another different embodiment, a reinforcing member is provided on the entire inner surface of the eye joint body (6). A member other than a resin may be used, such as a steel sheet bonded and arranged, and the durability of the eye joint (3) can be improved, excessive distortion and deformation can be prevented, and long-term airtightness can be maintained. You can do it.
[0045]
Next, the third and fourth embodiments will be described in detail. First, the eye joint (3) has excellent shape stability by being formed of an engineering plastic such as polyamide (hereinafter referred to as engineering plastic). However, the engaging claw (16) has a tapered shape in the inner direction of the eye joint (3) and has an inverted tapered shape. Therefore, if it is attempted to form the reverse-tapered engaging claw (16) with the same mold as the eye joint body (6), it becomes difficult to form such that the reverse-tapered portion is difficult to remove from the mold. For this reason, in the third embodiment shown in FIG. 5 and the fourth embodiment shown in FIG. 6, the engaging claw (16) is formed separately from the eye joint body (6), and each member can be easily formed. I have.
[0046]
First, in the third embodiment shown in FIG. 5, only the contact portion (13) of the branch pipe (10) is formed integrally with the eye joint body (6), but the retaining portion (14) is formed of the eye joint body (6). And an engaging claw (16) is integrally formed with the retaining portion (14). Then, after each molding, a retaining portion (14) is welded and fixed to the side surface of the contact portion (13). In this manner, by separately forming the retaining portion (14) having the engaging claw (16), the form of the eye joint body (6) is simplified as compared with the first and second embodiments, and The workability of the eye joint body (6) is improved, and the processing of the engagement claws (16) provided on the retaining portion (14) is also facilitated. Can be enhanced.
[0047]
Further, in the fourth embodiment shown in FIG. 6, the branch pipe (10) is formed integrally with the eye joint body (6) without providing the engaging claws (16), and the retaining portion of the branch pipe (10) is prevented. (14) The cutout (15) is formed in an open cylindrical shape. Then, a clip member (21) provided with an engaging claw (16) is formed separately from the eye joint body (6) provided with the branch pipe (10). Then, as shown in FIG. 6, this clip member (21) is inserted into the retaining portion (14) through the insertion opening (11), and is pulled out of the rear end side wall surface (25) of the engaging claw (16). The clip member (21) is fitted to the retaining portion (14) by engaging with the base of the notch (15) opened to the retaining portion (14).
[0048]
Therefore, in the fourth embodiment, by providing the engaging claw (16) on the clip member (21) separate from the eye joint body (6), the eye joint body (6) can be easily formed without a reverse taper shape. And implementation at low cost is possible. Further, the clip member (21) may be formed of the same engineering plastic resin or the like as the branch pipe (10), or the engaging claw (16) may be formed of another resin that is easy to remove from the mold. The metal plate may be formed by bending. In any case, the engaging claw (16) can be formed easily and with high precision.
[0049]
Next, a fifth embodiment will be described in detail with reference to FIGS. 7 and 8. In the first to fourth embodiments, when the eye joint (3) is formed, the eye joint body (6) and the branch pipe are formed. Although all or part of (10) is integrally formed, in the fifth embodiment, the branch pipe (10) is formed integrally with the pipe (1) separately from the eye joint body (6). In a later step, the branch pipe (10) and the eye joint body (6) are welded and fixed.
[0050]
First, in the first step, as shown in FIG. 8, an annular bulge (5) is provided on the outer peripheral surface of the metal pipe (1) at a desired interval from the tip. The metal pipe (1) may be provided with a rust preventive treatment by subjecting the outer peripheral surface (2) to a rust preventive treatment such as zinc plating. Then, a resin branch pipe (10) is fixedly formed in a cylindrical shape by molding on the outer peripheral surface (2) of the insertion portion (4) of the pipe (1) including the annular bulge portion (5). Since the branch pipe (10) is provided in the pipe (1) by this molding, the branch pipe (10) and the pipe (1) can be separated even if the outer peripheral surface (2) of the pipe (1) is not necessarily made of resin. It becomes impossible and can be connected with highly reliable airtightness. Further, by burying the annular bulge portion (5) in the resin of the branch pipe (10), a retaining means having a high pull-out resistance between the branch pipe (10) and the pipe (1) can be obtained.
[0051]
Next, in the second step, as shown in FIG. 7, the distal end surface of the branch pipe (10) is attached to the welding surface (23) made of resin on the side surface of the eye joint body (6) in a direction orthogonal to the eye bolt (17). Is placed in contact. A welding means such as ultrasonic vibration heating welding or high frequency induction heating welding is added to the contact portion, and the eye joint body (6) and the branch pipe (10) are welded and fixed.
[0052]
By welding and fixing the eye joint body (6) and the branch pipe (10), the connection between the eye joint (3) and the pipe (1) is completed. In the fifth embodiment, as shown in FIG. Resin is welded to the outer periphery of the welded portion to provide a seal portion (22). The welding of the seal portion (22) can also be easily performed by ultrasonic vibration heating welding or high frequency induction heating welding. By providing the seal portion (22) in this manner, the connection strength between the eye joint body (6) and the branch pipe (10) is further increased, and the reliability with respect to airtightness and pull-out resistance can be further improved. It becomes possible.
[0053]
In this way, as in the fifth embodiment, the eye joint body (6) and the branch pipe (10) are separately formed, and the both are welded and fixed in a later step. ) Can be provided with a highly reliable airtightness and pull-out resistance, the structure of the branch pipe (10) becomes simple, and labor such as providing an engaging claw (16) is required. Not only that, productivity can be improved, but also work that is safe for the work environment and the human body is possible.
[0054]
In the fifth embodiment, since the branch pipe (10) is fixed to the pipe (1) by molding, a metal pipe (1) having no resin disposed on the outer peripheral surface (2) is used. However, a metal pipe (1) in which a resin coating (9) or a resin tube is closely attached to the entire outer peripheral surface (2) or the outer peripheral surface (2) of the insertion portion (4) may be used, A resin pipe (1) having a metal tube disposed on the inner peripheral surface including the annular bulge (5) may be used.
In these pipes (1), the resin disposed on the outer peripheral surface (2) and the resin of the branch pipe (10) are welded, so that the integrity of the pipe (1) and the branch pipe (10) can be increased. .
[0055]
【The invention's effect】
The present invention is configured as described above, and the connection between the automobile pipe, the pipe for various machines and devices, and other pipes and the eye joint is formed by the resin disposed on the inner peripheral surface of the branch pipe of the eye joint and the outer periphery of the pipe. Since the welding is performed by welding with the resin placed on the surface or by welding the branch pipe molded to the pipe to the eye joint, the connection structure between the pipe and the eye joint must have a highly reliable airtightness. Can be. Further, since the branch pipe of the eye joint is provided with a pipe retaining means, it is possible to obtain an excellent pull-out resistance capable of preventing the pipe and the eye joint from separating from each other.
[0056]
Therefore, the fluid can flow smoothly without leakage through the eye joint between the pipe and the base body in which the fluid flow directions are orthogonal to each other. In addition, since the connection between the pipe and the eye joint is made by welding of resin instead of brazing with metal, it can be done by an easy method without the need for skilled skills and many man-hours, and it can be connected to the work environment and the human body. The effect can be prevented. Then, the production of the eye joint and the connection work with the pipe can be efficiently performed, and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a connection structure between an eye joint and a pipe according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a process of inserting a pipe into a branch pipe in the first embodiment.
FIG. 3 is a cross-sectional view of the second embodiment, in which a tapered portion is provided at a tip of a pipe.
FIG. 4 is a sectional view showing a process of inserting a pipe into a branch pipe in the second embodiment.
FIG. 5 is a cross-sectional view of the third embodiment, in which a retaining portion is formed separately from the main body of the branch pipe.
FIG. 6 is a cross-sectional view of the fourth embodiment, in which an engaging claw is formed on a clip member separate from the main body of the retaining portion.
FIG. 7 is a cross-sectional view of the fifth embodiment, in which a branch pipe fixed to a pipe by molding is welded and fixed to an eye joint body.
FIG. 8 is a sectional view of a state before welding of a branch pipe fixed to a pipe and an eye joint body in a fifth embodiment.
[Explanation of symbols]
1 Piping
2 Outer surface
3 Eye joint
4 Insertion part
5 Annular bulge
6 Eye joint body
8 Mounting holes
9 Resin coating
10 Branch pipe
12 Inner circumference
16 Engagement pawl
17 Eye Bolt
26 Flow passage

Claims

An eye bolt mounting hole is formed through the shaft core, and a flow passage communicating with the mounting hole is provided integrally with an eye joint body provided in a direction orthogonal to the axis of the mounting hole and an outer surface of the eye joint body. And a branch pipe arranged in a direction orthogonal to the axis of the mounting hole and communicating with the flow passage, the pipe can be inserted and connected to the branch pipe of the eye joint body, and the outer peripheral surface of the insertion portion of the pipe and The inner peripheral surface of the branch pipe that is in contact with the outer peripheral surface is made of resin, and is engaged with an annular bulge formed on the outer periphery of the pipe through a desired interval from the tip of the insertion portion, and a pipe retaining means. The engaging claw to be formed is formed integrally with or separately from the branch pipe on the inner surface of the branch pipe, and the resin on the inner peripheral surface of the branch pipe and the resin on the outer peripheral surface of the pipe can be welded and fixed by welding means. The characteristic eye joint.

A mounting hole for the eyebolt is formed through the shaft core, and a flow passage communicating with the mounting hole is provided in an eye joint body provided in a direction orthogonal to the shaft core of the mounting hole. A communicating branch pipe is provided integrally with the eye joint body, and a pipe can be inserted into and connected to the branch pipe of the eye joint body. An annular bulge is formed on the outer circumference at a desired distance from the tip of the part, and an engagement claw that engages with the annular bulge and serves as a means for preventing the pipe from being removed is integrated with the inner surface of the branch pipe. In addition to being formed separately, the inner peripheral surface of the branch pipe that is in contact with the outer peripheral surface of the pipe insertion portion is made of resin, and the resin on the inner peripheral surface of the branch pipe and the resin on the outer peripheral surface of the pipe are welded by welding means. The connection structure between the eye joint and the piping, which is fixed.

In the branch pipe of the eye joint body, an outer peripheral surface of an insertion portion into the branch pipe is made of resin, and a pipe provided with an annular bulging portion on an outer circumference at a desired interval from a tip of the insertion section is inserted, A step of engaging an engaging claw integrally or separately formed on the inner surface of the branch pipe with the annular bulging portion of the pipe to serve as a pipe retaining means, and a branch contacting the outer peripheral surface of the insertion section of the pipe. Connecting the eye joint body and the pipe by welding and fixing the resin of the branch pipe having an inner circumferential surface of the pipe made of resin and the resin of the outer circumferential face of the pipe by welding means. And connection method with piping.

A mounting hole for the eyebolt is formed through the shaft core, and a flow passage communicating with the mounting hole is provided in an eye joint body provided in a direction orthogonal to the shaft core of the mounting hole, and on an outer peripheral surface on a connection side to the eye joint body. A pipe as a retaining means is formed by providing an annular bulge and fixing a resin branch pipe by molding to the outer peripheral surface including the annular bulge, and forming a branch pipe fixed to this pipe with an eye. A connection structure between an eye joint and a pipe, characterized in that the joint body is welded and fixed to the welding surface made of resin of the joint body by a welding means so as to be able to communicate with the flow passage in a direction orthogonal to the axis of the mounting hole.

A pipe with an annular bulge on the outer peripheral surface on the connection side with the eye joint body, and a resin branch pipe fixed to the outer peripheral surface including the annular bulge by molding to prevent the pipe from falling off. And a branch pipe fixed to the pipe is disposed in contact with the resin-made welding surface of the eye joint body so as to be able to communicate with the flow passage in a direction orthogonal to the axis of the mounting hole of the eye bolt, and the welding means A method of connecting an eye joint and a pipe, wherein the step of welding and fixing a branch pipe to the joint body connects the eye joint body and the pipe.