JP2004052888A - Connecting structure between small diameter metal pipe and flexible resin hose - Google Patents
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Abstract
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、外径２０ｍｍ以下の比較的細径の金属管と、樹脂製可撓ホースとの接続構造に係るもので、金属管と樹脂製可撓ホースとの気密性を長期に保持可能とし、かつ廉価な接続構造とする事を目的とする。
【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、ゴム等で形成した樹脂製可撓ホースとの接続構造として、特開平９−７９４６２号公報記載の発明、実用新案登録第２５７１６５６号公報記載の考案等が存在する。前者の特開平９−７９４６２号公報記載の従来発明では、金属管の外周に設けた環状凹溝に、樹脂製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、金属管と樹脂製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、上記従来発明では、シールリング部材の環状凹部の形状や形成幅に、金属管ごとにばらつきを生じ易く、シールリング部材の位置ズレや歪みを生じる可能性があった。また、環状凹部の形状が均一であっても、形成幅が広過ぎると、樹脂製可撓ホースとの接触によりシールリング部材が横方向に押し潰されて、樹脂製可撓ホース内周に強く密着できず、気密性を損なう虞があった。更に、金属管に拡径部や環状凹溝を設けるのは、金属管の加工に手間が掛かるとともに、シールリング部材の組み付け工数や部品点数の増加を招き、コスト高となる虞があった。
【０００４】
また、実用新案登録第２５７１６５６号公報記載の従来考案では、金属管の外周に、気密的に密着する樹脂スリーブを装着し、樹脂製可撓ホースへの挿入側の外径を大きくしている。そして、樹脂スリーブを装着した金属管を、樹脂製可撓ホース内に挿入接続し、樹脂製可撓ホースの復元収縮力により前記樹脂スリーブを樹脂製可撓ホース内周に密着させる事により、気密性を保つとともに、抜けも防止しようとしていた。
【０００５】
しかしながら、樹脂製可撓ホースの復元収縮力により樹脂スリーブと密着させているので、内部を流通する流体が高圧な場合は、その圧力により樹脂製可撓ホースが膨張して、樹脂製可撓ホースと樹脂スリーブとの間に隙間を生じて気密性が損われる虞がある。この不具合を防止するため、樹脂製可撓ホースと金属管との接続部の外周に、緊締バンド等を装着する手段もあるが、部品点数や組み立て工数の増加を招き、煩わしいものとなる。
【０００６】
本発明は上述の如き課題を解決しようとするものであり、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と樹脂製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。
【０００７】
【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、樹脂製可撓ホース内に金属管を挿入接続する接続構造に於いて、樹脂製可撓ホースと、この樹脂製可撓ホース内に挿入接続し外周に樹脂被膜を有した金属管とから成り、金属管外周の樹脂被膜と樹脂製可撓ホース内周とを融点の近似した樹脂で形成し、この両樹脂の加熱に伴う溶着固定により樹脂製可撓ホースと金属管とを接続して成るものである。
【０００８】
また、第２の発明は、樹脂製可撓ホース内に金属管を挿入接続する接続構造に於いて、内周に非溶着素材又は後述する金属管外周の樹脂被膜とは融点の異なる素材を配置した樹脂製可撓ホースと、この樹脂製可撓ホース内に挿入接続し外周に樹脂被膜を有した金属管と、この金属管と樹脂製可撓ホースとの接続部外周に配置する樹脂スリーブとから成り、樹脂スリーブ内周と金属管外周の樹脂被膜、及び樹脂スリーブ内周と樹脂製可撓ホースの外周とを融点の近似した樹脂で形成し、樹脂被膜、樹脂スリーブ、樹脂製可撓ホースを各々溶着する事により樹脂製可撓ホースと金属管とを接続して成るものである。
【０００９】
また、金属管は、樹脂製可撓ホース内への挿入側の外周に環状凹凸を設け、この環状凹凸形状に対応させて樹脂製可撓ホースを金属管外周に密着配置しても良い。
【００１０】
また、樹脂製可撓ホースは、一つの樹脂素材から成る単層で形成するか又は異なる素材から成る複数層で形成し、少なくとも金属管外周の樹脂被膜と接触する最内層を、樹脂被膜と融点の近似した樹脂としても良い。
【００１１】
また、樹脂製可撓ホースは、異なる素材から成る複数層で形成し、少なくとも最外層を、金属管外周の樹脂被膜及び樹脂スリーブと融点の近似した樹脂としても良い。
【００１２】
【作用】
本発明は上述の如く構成したものであり、第１の発明で、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で樹脂被膜を外周に有した金属管を、樹脂製可撓ホースと接続するには、例えば高周波により、金属管の先端を加熱し、先端外周に存在する樹脂被膜を溶融する。次に、この加熱箇所の樹脂被膜の十分な溶融が確認されたら、樹脂製可撓ホース内に金属管の先端を挿入して装着する。この樹脂製可撓ホースと金属管との接続部を、空冷等により冷却する事により、先に溶融した樹脂が次第に固化し、樹脂製可撓ホース内周の樹脂と金属管外周の樹脂被膜との溶着面が互いに溶融固化して接着される。そして、樹脂被膜と樹脂製可撓ホースとを十分に固着させる事により、金属管への樹脂製可撓ホースの接続が完了するものである。
【００１３】
上述の如く、融点が近似する金属管外周の樹脂被膜と樹脂製可撓ホースの樹脂とを溶着するので、両樹脂が一体化し、信頼性の高い気密性を得る事ができるとともに、この気密性を長期に持続可能で、耐久性に優れた接続構造を得る事ができる。また、金属管からの樹脂製可撓ホースの抜け防止効果も高いものとなる。また、気密性の高い接続構造を、樹脂の溶着を行うだけで容易に実現可能であるし、シールリング部材や緊締バンド等を必要とせず、部品点数や組み立て工数の増加を抑えて、廉価な製品とする事ができる。
【００１４】
また、上記樹脂の溶着手段として、上記には金属の先端を加熱し表面の樹脂被膜を溶融して樹脂製可撓ホースを溶着させる高周波溶着を挙げてあるが、金属管に樹脂製可撓ホースを装着し、接続部に熱風を当てて溶着を行う熱風溶着で行っても良いし、誘導加熱溶着、超音波溶着、射出溶着等で行っても良い。
【００１５】
また、樹脂製可撓ホースは、内部を流通する流体の種類や使用目的により、一つの樹脂素材から成る単層で形成する場合と、異なる素材から成る複数層で形成する場合がある。何れの場合でも、少なくとも金属管外周の樹脂被膜と接触する最内層を、金属管の樹脂被膜と融点の近似した樹脂とする事により、両樹脂の良好な溶着が可能となり、金属管と樹脂製可撓ホースとの接続構造の気密性と抜け防止効果を高める事ができる。尚、上記融点の近似した樹脂とは、同一の温度で溶融するか又はほぼ同一の近似した温度で溶融し、両樹脂の良好な溶着が可能なものを示すものである。また、樹脂製可撓ホースや金属管の樹脂被膜に使用するのが好ましい樹脂は、ポリアミド１１やポリアミド１２等があり、気密性の高い溶着が可能となる。
【００１６】
また、樹脂製可撓ホースは、ガス透過性を少なくするため、例えばポリアミド層の内周にフッ素系樹脂を配置する等、溶着のための樹脂とは異なる素材を樹脂製可撓ホースの内側に配置して、複数層で形成する場合がある。このような場合、フッ素系樹脂と金属管の樹脂被膜に使用するポリアミドとは融点が異なり、樹脂製可撓ホース内周と金属管の樹脂被膜との溶着が困難となる。
【００１７】
そのため、第２の発明では、樹脂製可撓ホースと金属管とを、樹脂スリーブを介して接続している。それには、まず樹脂製可撓ホースを樹脂スリーブに挿入接続し、この接続部を超音波等により加熱する。この加熱により、樹脂製可撓ホースの外周の樹脂と樹脂スリーブの樹脂とが気密的に溶着される。次に、金属管の先端側を高周波等により加熱し、外周の樹脂被膜を溶融する。この樹脂被膜の十分な溶融状態で、金属管を樹脂スリーブ及び樹脂製可撓ホースに挿入すると、金属管の樹脂被膜と樹脂スリーブとが気密的に溶着される。従って、樹脂スリーブを介して金属管と樹脂製可撓ホースとの接続が可能となるとともに、この接続構造は、信頼性の高い気密性と抜け防止効果を得る事ができる。また、本発明の樹脂の溶着も、高周波溶着、熱風溶着、誘導加熱溶着、超音波溶着、射出溶着等で行う事ができる。
【００１８】
また、上述の如く、内部を流通する流体の種類や使用目的に応じて、樹脂製可撓ホースを異なる素材から成る複数層で形成した場合は、気密性の高い溶着を可能とするために、少なくとも樹脂スリーブと溶着する最外層を、金属管外周の樹脂被膜及び樹脂スリーブと融点の近似する樹脂とするのが好ましい。
【００１９】
また、金属管は、樹脂製可撓ホース内への挿入側の外周に環状凹凸を設け、樹脂製可撓ホース又は樹脂スリーブを、前記環状凹凸形状に対応させて金属管外周に密着配置し、金属管と樹脂製可撓ホースとを溶着すれば、金属管と樹脂製可撓ホースとの気密性や抜け防止効果を高める事ができる。
【００２０】
【実施例】
以下、本発明を自動車の流体供給機構に実施した第１実施例を、図１、図２に於て説明すれば、（１）は金属管で、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。このような金属管（１）を、樹脂製可撓ホース（３）で連結し、燃料その他の流体を流通可能としている。
【００２１】
そして、第１実施例では、直径８．０ｍｍ、肉厚０．７ｍｍの金属製素管の外周に、ポリアミド１２（以下ＰＡ１２と言う）を溶着させて厚さ５０μｍの樹脂被膜（２）を形成し、本実施例の金属管（１）を得ている。そして、金属管（１）の挿入側の先端から３０ｍｍの位置に、スプール加工によりガイドスプール部（４）を設け、金属管（１）に樹脂製可撓ホース（３）を装着する際の目安としている。一方、金属管（１）に装着する樹脂製可撓ホース（３）は、可塑剤７％を混入したＰＡ１２を用いて形成し、ＰＡ１２層（５）のみの単層構造としている。
【００２２】
そして、本発明では、金属管（１）と樹脂製可撓ホース（３）とを、融点の近似した樹脂同志の熱溶着により行い、金属管（１）と樹脂製可撓ホース（３）との接続構造の気密性を保つとともに、容易な接続作業を可能とするものである。第１実施例に於ける金属管（１）と樹脂製可撓ホース（３）との接続工程を説明すれば、まず、図２に示す如く、金属管（１）の先端からガイドスプール部（４）までの間の外周に、リング状の高周波電極（１３）を配置し、高周波を発生させる。この高周波エネルギーにより、金属管（１）の先端が発熱するので、該金属管（１）の先端外周の樹脂被膜（２）が半溶融ないし溶融される。
【００２３】
次に、この樹脂被膜（２）の十分な溶融が確認されたら、該金属管（１）の先端を樹脂製可撓ホース（３）に挿入して装着する。この装着は、図１に示す如く、樹脂製可撓ホース（３）の先端がガイドスプール部（４）に突き当たるまで樹脂製可撓ホース（３）を押し込むとともに、金属管（１）や樹脂被膜（２）の温度低下が生じないうちに迅速に行う。
【００２４】
上記金属管（１）への樹脂製可撓ホース（３）の装着状態で、この接続部を空冷等により又は加圧手段（１４）にて加圧しながら冷却すると、金属管（１）の外周のＰＡ１２と樹脂製可撓ホース（３）の内周のＰＡ１２とが固化し、互いに固着される。そして、樹脂被膜（２）と樹脂製可撓ホース（３）のＰＡ１２とを十分に固着させる事により、信頼性の高い気密性と抜け防止効果を有する金属管（１）と樹脂製可撓ホース（３）の接続が可能となる。
【００２５】
また、金属管（１）への樹脂製可撓ホース（３）の押し込み時に、樹脂製可撓ホース（３）の先端により溶融状態の樹脂被膜（２）の表面がシゴかれ、図１に示す如く、ＰＡ１２の一部が樹脂製可撓ホース（３）の先端と金属管（１）のガイドスプール部（４）との間に溜まって固化し、ＰＡ溜（９）を形成する。このＰＡ溜（９）により樹脂製可撓ホース（３）の先端とガイドスプール部（４）とが溶着するので、接続構造の気密性と抜け防止効果が、より高まるものとなる。
【００２６】
また、第１実施例では、金属管（１）の樹脂被膜（２）と樹脂製可撓ホース（３）を、ＰＡ１２を用いて同一の融点の樹脂で形成しているので、気密性に優れた強固な溶着が可能となる。しかし、溶融温度が同一又は近似し、好ましくは相溶性或いは同質の樹脂であれば、ＰＡ１２以外の樹脂で、樹脂被膜（２）と樹脂製可撓ホース（３）とを形成しても良い。例えば、樹脂被膜（２）と樹脂製可撓ホース（３）とを、ポリアミド１１で形成しても良い。また、フッ素系樹脂で形成しても良いが、但し、この場合はフッ素系樹脂に熱可塑性材料を含んだものが、より好ましい。例えば、フッ素系樹脂にアクリルを含むＰＶｄＦ（ポリフッ化ビニリデン）等がある。このような樹脂とする事で、金属管（１）と樹脂製可撓ホース（３）との良好な溶着が可能となる。
【００２７】
上記の如く、本発明の金属管（１）と樹脂製可撓ホース（３）との接続は、ＰＡ１２等の樹脂の溶着によって行うので、信頼性の高い気密性を得る事ができるとともに、接続構造の耐久性にも優れ、高い気密性を長期に持続可能となる。また、金属管（１）からの樹脂製可撓ホース（３）の抜け防止効果も高まるものである。更に、樹脂の溶着を行うだけで、容易に接続作業を行う事ができ、従来技術の如く、気密性を得るためのシールリング部材や緊締バンド等を必要とせず、部品点数や組み立て工数の増加を抑えて、信頼性の高い気密性を有する接続構造を、廉価に実施する事が可能となる。
【００２８】
また、上記第１実施例では、樹脂製可撓ホース（３）をＰＡ１２層（５）のみの単層で形成しているので、金属管（１）の樹脂被膜（２）と直に溶着できるが、他の異なる第２実施例では、図３に示す如く、樹脂製可撓ホース（３）のガス透過性を低下させるため、ＰＡ１２から成るＰＡ１２層（５）の内側に接着層（図示せず）を介して１００〜２００μｍの厚さでフッ素系樹脂層（６）を配置して、複数層構造の樹脂製可撓ホース（３）としている。
【００２９】
しかし、フッ素系樹脂層（６）は、金属管（１）の樹脂被膜（２）であるＰＡ１２とは融点が異なるため、このままでは溶着が困難である。そこで、第２実施例では、金属管（１）と樹脂製可撓ホース（３）との接続部外周に樹脂スリーブ（７）を装着し、この樹脂スリーブ（７）を介して金属管（１）と樹脂製可撓ホース（３）とを接続する。
【００３０】
前記樹脂スリーブ（７）は、本実施例では、直径１０ｍｍ、厚さ１．０ｍｍとし、ＰＡ１２にて単層で形成している。また、金属管（１）は、図３に示す如く、該樹脂スリーブ（７）への挿入部分を拡径して拡径部（８）を設け、樹脂製可撓ホース（３）に挿入する先端側は、絞り加工により径小な径小部（１０）としている。
【００３１】
本実施例での金属管（１）と樹脂製可撓ホース（３）との接続工程は、図４の左側に示す如く、まず樹脂製可撓ホース（３）の先端を、この樹脂製可撓ホース（３）と融点を同一とする樹脂スリーブ（７）内に挿入接続し、この接続部を超音波により加熱し、樹脂製可撓ホース（３）の外周に配置したＰＡ１２層（５）と樹脂スリーブ（７）とを溶着させる。
【００３２】
次に、図４の右側に示す如く、高周波電極（１３）により金属管（１）の拡径部（８）に高周波を当てて加熱し、拡径部（８）の外周に存在する樹脂被膜（２）を溶融する。この樹脂被膜（２）の十分な溶融状態で、金属管（１）を樹脂スリーブ（７）内に挿入し、拡径部（８）を樹脂スリーブ（７）内に配置するとともに、金属管（１）の先端の径小部（１０）を樹脂製可撓ホース（３）内に挿入する。この挿入により、融点の近似する拡径部（８）の樹脂被膜（２）と樹脂スリーブ（７）とが互いに溶着され、金属管（１）と樹脂製可撓ホース（３）とは、樹脂スリーブ（７）を介して接続される。
【００３３】
上記溶着時には、図３に示す如く、金属管（１）の樹脂被膜（２）と樹脂スリーブ（７）との接続部の外周全体、及び樹脂製可撓ホース（３）と樹脂スリーブ（７）との接続部の外周全体を、加圧手段（１４）により加圧しながら冷却する事により、高い気密性と接続強度を持つ溶着が可能となる。従って、第２実施例に於いても、金属管（１）と樹脂製可撓ホース（３）との接続構造は、信頼性の高い気密性と抜け防止効果が得られる。
【００３４】
また、上記各実施例では、樹脂の溶着を高周波溶着又は超音波溶着により行っているが、熱風溶着、誘導加熱溶着、射出溶着等で樹脂の溶着を行っても良い。
【００３５】
また、図５に示す他の異なる第３実施例は、上記第１実施例と同様に、金属管（１）の樹脂被膜（２）と樹脂製可撓ホース（３）とを直に溶着するものであるが、第１実施例よりも、樹脂製可撓ホース（３）への金属管（１）の挿入距離を長尺としている。従って、金属管（１）と樹脂製可撓ホース（３）との溶着面積が増し、気密性や抜け防止効果が更に高まるものとなる。
【００３６】
また、図６〜図１２に示す第４〜第１０実施例では、後述の如く、拡径部（８）や径小部（１０）、環状膨出部（２）を設ける事で金属管（１）の外周に形成される環状凹凸により、金属管（１）からの樹脂製可撓ホース（３）の抜け防止効果や気密性を更に高めようとしている。まず、図６に示す第４実施例では、金属管（１）の先端とガイドスプール部（４）との間に、鋸歯状壁（１１）を有する環状膨出部（１２）を一つ設けている。そして、環状膨出部（１２）の環状凹凸に沿って樹脂製可撓ホース（３）を変形させて、金属管（１）の表面に密着させて、互いを溶着する事により、樹脂製可撓ホース（３）に抜け力が作用した際に、樹脂製可撓ホース（３）の内面に前記鋸歯状壁（１１）が食い込むので、抜け防止効果が高い。また、樹脂の溶着の際に、図６に示す如く、鋸歯状壁（１１）とガイドスプール部（４）との間の、樹脂製可撓ホース（３）と金属管（１）との接触部外周を加圧手段（１４）により加圧する事により、樹脂の固着度が高まり、気密性と抜け防止効果が高まる。
【００３７】
また、図７に示す第５実施例は、鋸歯状壁（１１）を有する環状膨出部（１２）を、金属管（１）の外周に２つ形成して、気密性と抜け防止効果を更に高めたものである。また、図８に示す第６実施例では、樹脂製可撓ホース（３）よりも径大な金属管（１）と樹脂製可撓ホース（３）とを接続するため、金属管（１）の先端を絞り加工して径小部（１０）を設けている。このような接続構造に於いても、本発明の樹脂の溶着にて接続を行う事により、信頼性の高い気密性と抜け防止効果を得る事ができる。
【００３８】
また、図９に示す第７実施例では、樹脂製可撓ホース（３）の装着の目安としてガイドスプール部（４）を設けずに、このガイドスプール部（４）の相当位置を絞り加工して、金属管（１）に径小部（１０）を設けている。そして、この径小部（１０）を樹脂製可撓ホース（３）装着のための目安とするとともに、環状凹凸により、樹脂製可撓ホース（３）と金属管（１）との気密性と抜け防止効果を高めている。また、図１０に示す第８実施例では、金属管（１）の先端を拡径して、長尺な拡径部（８）を設け、この拡径部（８）の外周全体を被覆するように樹脂製可撓ホース（３）を装着している。
【００３９】
また、図１１に示す第９実施例では、金属管（１）の先端に長尺な拡径部（８）を設けるとともに、更にこの拡径部（８）に、鋸歯状壁（１１）を有する環状膨出部（１２）を二つ形成している。また、図１２に示す第１０実施例では、金属管（１）にガイドスプール部（４）を設けるとともに、金属管（１）の先端とガイドスプール部（４）との間に、第４、第５、第９実施例とは異なる形状の、断面円弧状の環状膨出部（１２）を設けている。上記第４〜第１０実施例に於いても、樹脂の溶着により、金属管（１）と樹脂製可撓ホース（３）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、拡径部（８）や径小部（１０）、環状膨出部（１２）を設ける事で金属管（１）に形成される環状凹凸により、接続構造に信頼性の高い気密性と抜け防止効果を持たせる事ができる。
【００４０】
【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金属管と樹脂製可撓ホースとの接続を、金属管外周に設けた樹脂被膜と樹脂製可撓ホースとの樹脂の溶着により行っているから、信頼性の高い気密性と耐久性を得る事ができる。また、接続後は、装置使用時の振動その他の刺激によって、樹脂製可撓ホースから金属管が容易に抜ける事はなく、良好な使用が持続するものである。また、このように気密性の高い接続構造を、樹脂の溶着を行うだけで、容易に実施可能であるし、シールリング部材や緊締バンド等の部材を必要とせず、部品点数や組み立て工数の増加を抑えて、廉価な製品を得る事ができる。
【００４１】
また、内部を流通する流体の種類、その他の使用目的により、樹脂製可撓ホースの内周に、金属管の樹脂被膜とは異質の素材を配置した場合は、金属管と樹脂製可撓ホースとの接続部の外周に、樹脂スリーブを装着し、この樹脂スリーブを介して、金属管と樹脂製可撓ホースとを、気密的に接続する事が可能である。即ち、樹脂スリーブと樹脂製可撓ホースの外周の樹脂とを溶着するとともに、樹脂スリーブと金属管の樹脂被膜とを溶着する事により、金属管と樹脂製可撓ホースとを、信頼性の高い気密性で接続可能となり、抜け防止効果も高いものとなる。
【図面の簡単な説明】
【図１】本発明の第１実施例の樹脂製可撓ホースと金属管の接続構造の断面図。
【図２】第１実施例の樹脂製可撓ホースと金属管との接続過程を示す断面図。
【図３】第２実施例の樹脂製可撓ホースと金属管の接続構造の断面図。
【図４】第２実施例の樹脂製可撓ホースと金属管との接続過程を示す断面図。
【図５】第３実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図６】第４実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図７】第５実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図８】第６実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図９】第７実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図１０】第８実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図１１】第９実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【図１２】第１０実施例の樹脂製可撓ホースと金属管との接続構造の断面図。
【符号の説明】
１ 金属管
２ 樹脂被膜
３ 樹脂製可撓ホース
７ 樹脂スリーブ[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 structure relates to a connection structure between a relatively thin metal tube having an outer diameter of 20 mm or less and a flexible resin hose, and the airtightness between the metal tube and the flexible resin hose is maintained for a long time. The purpose is to make the connection structure possible and inexpensive.
[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 The invention described in Japanese Patent Application Laid-Open No. 9-79462, the invention described in Utility Model Registration No. 2571656, and the like, as a connection structure between a relatively small-diameter metal tube and a resin flexible hose formed of resin, rubber, or the like. Exists. In the former prior art described in Japanese Patent Application Laid-Open No. 9-79462, a seal ring member that elastically adheres to the inner peripheral surface of a flexible resin hose is inserted and arranged in an annular groove provided on the outer periphery of a metal tube. Thereby, the airtightness between the metal tube and the resin flexible hose is to be maintained.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional invention, the shape and the width of the annular concave portion of the seal ring member tend to vary from one metal tube to another, and there is a possibility that the position and distortion of the seal ring member may occur. In addition, even if the shape of the annular concave portion is uniform, if the formed width is too wide, the seal ring member is crushed in the lateral direction due to contact with the resin flexible hose, and strongly adheres to the inner periphery of the resin flexible hose. There was a possibility that airtightness could be impaired due to inability to adhere. Further, providing an enlarged diameter portion or an annular concave groove in the metal pipe requires time and effort for processing the metal pipe, and also increases the number of steps for assembling the seal ring member and the number of parts, which may increase the cost.
[0004]
Further, in the conventional device described in Japanese Utility Model Registration No. 2571656, a resin sleeve is hermetically attached to the outer periphery of a metal tube to increase the outer diameter on the insertion side of the resin flexible hose. Then, the metal tube to which the resin sleeve is attached is inserted into and connected to the resin flexible hose, and the resin sleeve is brought into close contact with the inner periphery of the resin flexible hose by the restoring contraction force of the resin flexible hose, thereby providing airtightness. He was trying to keep his character and prevent it from falling off.
[0005]
However, since the resin flexible hose is brought into close contact with the resin sleeve due to the restoring contraction force of the resin flexible hose, when the fluid flowing through the inside is high in pressure, the resin flexible hose expands due to the pressure, and the resin flexible hose expands. There is a possibility that a gap is formed between the resin and the resin sleeve, and the airtightness is impaired. In order to prevent this problem, there is a means for attaching a tightening band or the like to the outer periphery of the connection portion between the resin-made flexible hose and the metal pipe. However, the number of parts and the number of assembling steps are increased, which is troublesome.
[0006]
The present invention is intended to solve the above-described problems, and in various mechanical devices such as vehicles, ships, and construction machines, particularly in automobiles, a fuel main pipe, a return pipe, an evaporation pipe, a vacuum pipe, an oil pipe. In other connection structures of a relatively small diameter metal tube and a flexible resin hose, it is possible to obtain highly reliable airtightness. 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.
[0007]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a connection structure for inserting and connecting a metal tube into a resin flexible hose. And a metal tube having a resin coating on the outer periphery. The resin coating on the outer periphery of the metal tube and the inner periphery of the resin flexible hose are formed of a resin having a melting point close to that of the metal tube. It is formed by connecting a flexible hose made of resin and a metal tube by welding and fixing.
[0008]
According to a second aspect of the present invention, in a connection structure in which a metal tube is inserted and connected in a resin flexible hose, a non-welded material or a material having a melting point different from that of a resin coating on the outer periphery of the metal tube described later is arranged on the inner periphery. A flexible resin hose, a metal tube inserted and connected in the flexible resin hose and having a resin coating on the outer periphery, and a resin sleeve disposed on the outer periphery of a connection portion between the metal tube and the flexible resin hose. The resin coating on the inner periphery of the resin sleeve and the outer periphery of the metal tube, and the inner periphery of the resin sleeve and the outer periphery of the flexible hose made of resin are formed of resin having similar melting points. Are welded to connect a flexible hose made of resin and a metal tube.
[0009]
Further, the metal tube may be provided with annular irregularities on the outer periphery on the side of insertion into the resin flexible hose, and the resin flexible hose may be closely attached to the outer periphery of the metal tube corresponding to the annular irregular shape.
[0010]
In addition, the resin flexible hose may be formed of a single layer made of one resin material or may be formed of a plurality of layers made of different materials, and at least the innermost layer that comes into contact with the resin film on the outer periphery of the metal pipe is formed of a resin film and a melting point. May be used.
[0011]
Further, the resin flexible hose may be formed of a plurality of layers made of different materials, and at least the outermost layer may be made of a resin whose melting point is similar to that of the resin coating and the resin sleeve on the outer periphery of the metal tube.
[0012]
[Action]
The present invention is configured as described above, and in the first invention, in various mechanical devices such as a vehicle, a ship, and a construction machine, particularly in an automobile, a main pipe for fuel, a return pipe, an evaporative pipe, a vacuum pipe, To connect an oil pipe or other metal pipe having a relatively small diameter and a resin coating on the outer circumference to a flexible hose made of resin, for example, the tip of the metal pipe is heated by high frequency and the resin existing on the outer circumference of the tip is connected. Melt the coating. Next, when it is confirmed that the resin film at the heated portion has sufficiently melted, the distal end of the metal tube is inserted and mounted in a flexible hose made of resin. By cooling the connection between the resin-made flexible hose and the metal tube by air cooling or the like, the resin melted earlier is gradually solidified, and the resin at the inner periphery of the resin-made flexible hose and the resin coating at the outer periphery of the metal tube are formed. Are melted and solidified and bonded to each other. By sufficiently fixing the resin coating and the resin flexible hose, the connection of the resin flexible hose to the metal tube is completed.
[0013]
As described above, the resin coating on the outer periphery of the metal tube having a similar melting point is welded to the resin of the flexible hose made of resin, so that the two resins are integrated, and highly reliable airtightness can be obtained. Can be obtained for a long time, and a connection structure with excellent durability can be obtained. Further, the effect of preventing the resin flexible hose from coming off from the metal tube is also high. In addition, a highly airtight connection structure can be easily realized only by welding the resin, does not require a seal ring member or a tightening band, and suppresses an increase in the number of parts and assembling man-hours. It can be a product.
[0014]
Further, as a means for welding the resin, high-frequency welding in which the tip of the metal is heated to melt the resin coating on the surface and the resin flexible hose is welded is mentioned above. And welding may be performed by hot air welding in which hot air is applied to the connection portion to perform welding, or may be performed by induction heating welding, ultrasonic welding, injection welding, or the like.
[0015]
Further, the resin flexible hose may be formed of a single layer made of one resin material, or may be formed of a plurality of layers made of different materials, depending on the type of fluid flowing through the inside and the purpose of use. In any case, by forming at least the innermost layer that is in contact with the resin coating on the outer periphery of the metal tube with a resin having a melting point close to that of the resin coating of the metal tube, good welding of both resins becomes possible, and the metal tube and the resin The airtightness of the connection structure with the flexible hose and the effect of preventing disconnection can be enhanced. The resins having similar melting points are those which are melted at the same temperature or are melted at substantially the same approximate temperature so that both resins can be satisfactorily welded. In addition, a resin that is preferably used for a resin flexible hose or a resin coating of a metal tube includes
[0016]
In addition, in order to reduce the gas permeability of the resin flexible hose, a material different from the resin for welding is placed inside the resin flexible hose, for example, by arranging a fluorine resin on the inner periphery of the polyamide layer. In some cases, they are arranged and formed in a plurality of layers. In such a case, the melting point of the fluororesin is different from that of the polyamide used for the resin coating of the metal tube, and it becomes difficult to weld the inner periphery of the resin-made flexible hose to the resin coating of the metal tube.
[0017]
Therefore, in the second invention, the resin flexible hose and the metal pipe are connected via the resin sleeve. To do this, first, a flexible resin hose is inserted and connected to the resin sleeve, and this connection is heated by ultrasonic waves or the like. By this heating, the resin on the outer periphery of the resin flexible hose and the resin on the resin sleeve are hermetically welded. Next, the distal end side of the metal tube is heated by high frequency or the like to melt the resin coating on the outer periphery. When the metal tube is inserted into the resin sleeve and the resin flexible hose in a sufficiently molten state of the resin film, the resin film of the metal tube and the resin sleeve are hermetically welded. Accordingly, connection between the metal tube and the flexible resin hose can be achieved via the resin sleeve, and the connection structure can achieve highly reliable airtightness and an effect of preventing detachment. In addition, welding of the resin of the present invention can be performed by high frequency welding, hot air welding, induction heating welding, ultrasonic welding, injection welding, or the like.
[0018]
In addition, as described above, depending on the type and purpose of the fluid flowing through the inside, if the resin flexible hose is formed of a plurality of layers made of different materials, in order to enable highly airtight welding, It is preferable that at least the outermost layer to be welded to the resin sleeve is made of a resin whose melting point is close to that of the resin film and the resin sleeve on the outer periphery of the metal tube.
[0019]
In addition, the metal tube is provided with annular irregularities on the outer periphery on the insertion side into the resin flexible hose, and the resin flexible hose or the resin sleeve is arranged in close contact with the outer periphery of the metal tube corresponding to the annular irregular shape, If the metal tube and the resin flexible hose are welded, the airtightness between the metal tube and the resin flexible hose and the effect of preventing the resin hose from coming off can be enhanced.
[0020]
【Example】
1 and 2, a first embodiment in which the present invention is applied to a fluid supply mechanism of an automobile will be described with reference to FIGS. 1 and 2. (1) is a metal tube which is disposed on an underfloor panel, a front panel, or the like. A fuel main pipe for supplying fuel from the fuel tank to the engine room, a fuel return pipe for returning surplus fuel from the engine to the fuel tank, an evaporative pipe for adsorbing fuel vapor in the fuel tank to a canister in the engine room, It has a relatively small diameter, such as a vacuum pipe or an oil pipe using the negative pressure of the intake air. Such a metal pipe (1) is connected by a flexible hose (3) made of resin, so that fuel and other fluids can flow.
[0021]
In the first embodiment, a resin coating (2) having a thickness of 50 μm is formed by welding polyamide 12 (hereinafter referred to as PA12) to the outer periphery of a metal tube having a diameter of 8.0 mm and a thickness of 0.7 mm. Then, the metal tube (1) of the present embodiment is obtained. A guide spool portion (4) is provided by spooling at a position 30 mm from the tip of the insertion side of the metal tube (1), and a guide when attaching the resin flexible hose (3) to the metal tube (1). And On the other hand, the resin flexible hose (3) attached to the metal tube (1) is formed using PA12 mixed with 7% of a plasticizer, and has a single-layer structure of only the PA12 layer (5).
[0022]
In the present invention, the metal tube (1) and the flexible resin hose (3) are welded to each other by heat welding of resins having similar melting points, and the metal tube (1) and the flexible resin hose (3) are joined together. In addition, the airtightness of the connection structure can be maintained and an easy connection operation can be performed. The process of connecting the metal tube (1) and the resin flexible hose (3) in the first embodiment will be described. First, as shown in FIG. A ring-shaped high-frequency electrode (13) is arranged on the outer periphery up to 4) to generate a high frequency. The high-frequency energy generates heat at the tip of the metal tube (1), so that the resin coating (2) on the outer periphery of the tip of the metal tube (1) is semi-melted or melted.
[0023]
Next, when sufficient melting of the resin film (2) is confirmed, the tip of the metal tube (1) is inserted into the resin flexible hose (3) and mounted. As shown in FIG. 1, this mounting is performed by pushing the resin flexible hose (3) until the tip of the resin flexible hose (3) comes into contact with the guide spool portion (4), and by pressing the metal tube (1) or the resin coating. The step (2) is performed promptly before the temperature is lowered.
[0024]
In a state where the resin flexible hose (3) is attached to the metal pipe (1), the connection is cooled by air cooling or the like while pressurizing with a pressurizing means (14). PA12 and the PA12 on the inner periphery of the resin flexible hose (3) are solidified and fixed to each other. Then, by sufficiently fixing the resin coating (2) and the PA12 of the resin-made flexible hose (3), the metal tube (1) having a highly reliable airtightness and an effect of preventing the resin hose from coming off and the resin-made flexible hose are provided. The connection of (3) becomes possible.
[0025]
In addition, when the flexible resin hose (3) is pushed into the metal pipe (1), the surface of the resin film (2) in a molten state is cut by the tip of the flexible resin hose (3), as shown in FIG. As described above, a part of the
[0026]
Further, in the first embodiment, the resin coating (2) of the metal tube (1) and the flexible hose (3) made of resin are formed of resin having the same melting point by using PA12, so that the airtightness is excellent. A strong welding can be achieved. However, the resin coating (2) and the resin flexible hose (3) may be formed of a resin other than PA12 as long as the resin has the same or similar melting temperature, and is preferably a resin having the same or similar melting temperature. For example, the resin film (2) and the resin flexible hose (3) may be formed of
[0027]
As described above, the connection between the metal tube (1) of the present invention and the flexible hose (3) made of resin is performed by welding resin such as PA12, so that highly reliable airtightness can be obtained and the connection can be achieved. The durability of the structure is excellent, and high airtightness can be maintained for a long time. In addition, the effect of preventing the resin flexible hose (3) from coming off from the metal pipe (1) is enhanced. Furthermore, the connection work can be easily performed only by welding the resin, and a seal ring member and a tightening band for obtaining airtightness are not required unlike the related art, and the number of parts and the number of assembly steps are increased. , And a highly reliable and airtight connection structure can be implemented at low cost.
[0028]
In the first embodiment, since the resin flexible hose (3) is formed of a single layer of only the PA12 layer (5), it can be directly welded to the resin coating (2) of the metal tube (1). However, in another different second embodiment, as shown in FIG. 3, in order to reduce the gas permeability of the resin flexible hose (3), an adhesive layer (not shown) is provided inside the PA12 layer (5) made of PA12. ), A fluororesin layer (6) having a thickness of 100 to 200 μm is disposed therebetween to form a resin flexible hose (3) having a multilayer structure.
[0029]
However, the melting point of the fluororesin layer (6) is different from that of PA12, which is the resin coating (2) of the metal tube (1), so that it is difficult to perform welding as it is. Therefore, in the second embodiment, a resin sleeve (7) is attached to the outer periphery of the connection portion between the metal tube (1) and the resin flexible hose (3), and the metal tube (1) is inserted through the resin sleeve (7). ) And a flexible hose (3) made of resin.
[0030]
In the present embodiment, the resin sleeve (7) has a diameter of 10 mm and a thickness of 1.0 mm, and is formed as a single layer of PA12. Further, as shown in FIG. 3, the metal tube (1) is provided with an enlarged portion (8) by increasing the diameter of a portion to be inserted into the resin sleeve (7), and is inserted into a resin flexible hose (3). The front end side is formed into a small diameter portion (10) by drawing.
[0031]
In the connecting step between the metal tube (1) and the resin flexible hose (3) in this embodiment, as shown on the left side of FIG. 4, first, the distal end of the resin flexible hose (3) is connected to the resin flexible hose (3). The PA12 layer (5) is inserted and connected in a resin sleeve (7) having the same melting point as that of the flexible hose (3) and heated by ultrasonic waves to be connected to the outer periphery of the resin flexible hose (3). And the resin sleeve (7) are welded.
[0032]
Next, as shown on the right side of FIG. 4, the high-frequency electrode (13) applies high frequency to the enlarged diameter portion (8) of the metal tube (1) and heats the metal tube (1). (2) is melted. With the resin film (2) in a sufficiently molten state, the metal tube (1) is inserted into the resin sleeve (7), the enlarged diameter portion (8) is arranged in the resin sleeve (7), and the metal tube ( Insert the small diameter portion (10) at the end of 1) into the flexible hose (3) made of resin. By this insertion, the resin coating (2) and the resin sleeve (7) of the enlarged diameter portion (8) having similar melting points are welded to each other, and the metal tube (1) and the resin flexible hose (3) are separated from each other by the resin. Connected via sleeve (7).
[0033]
At the time of the welding, as shown in FIG. 3, the entire outer periphery of the connection portion between the resin coating (2) of the metal tube (1) and the resin sleeve (7), and the resin flexible hose (3) and the resin sleeve (7) By cooling the entire outer periphery of the connecting portion with the pressure means (14) while applying pressure, welding with high airtightness and connection strength can be performed. Therefore, also in the second embodiment, the connection structure between the metal pipe (1) and the flexible hose (3) made of resin provides highly reliable airtightness and an effect of preventing detachment.
[0034]
In each of the above embodiments, the resin is welded by high frequency welding or ultrasonic welding. However, the resin may be welded by hot air welding, induction heating welding, injection welding, or the like.
[0035]
In another different third embodiment shown in FIG. 5, a resin coating (2) of a metal tube (1) and a flexible hose (3) made of resin are directly welded similarly to the first embodiment. However, the insertion distance of the metal tube (1) into the resin flexible hose (3) is longer than in the first embodiment. Therefore, the welding area between the metal tube (1) and the flexible hose (3) made of resin is increased, and the airtightness and the effect of preventing detachment are further enhanced.
[0036]
Further, in the fourth to tenth embodiments shown in FIGS. 6 to 12, as described later, a metal pipe (8), a small diameter part (10), and an annular bulge (2) are provided to provide a metal pipe ( The annular unevenness formed on the outer periphery of 1) is intended to further enhance the effect of preventing the
[0037]
In the fifth embodiment shown in FIG. 7, two annular bulges (12) each having a saw-tooth wall (11) are formed on the outer periphery of the metal tube (1) to improve the airtightness and the effect of preventing detachment. It is further enhanced. In the sixth embodiment shown in FIG. 8, the metal tube (1) is connected to the metal tube (1) having a larger diameter than the resin flexible hose (3) and the resin flexible hose (3). Is formed by drawing at its tip to form a small-diameter portion (10). Even in such a connection structure, by performing the connection by welding the resin of the present invention, it is possible to obtain highly reliable airtightness and a detachment prevention effect.
[0038]
In the seventh embodiment shown in FIG. 9, the guide spool (4) is not provided as a guide for mounting the flexible hose (3) made of resin, and the corresponding position of the guide spool (4) is drawn. Thus, a small-diameter portion (10) is provided in the metal tube (1). The small diameter portion (10) is used as a guide for mounting the resin flexible hose (3), and the airtightness between the resin flexible hose (3) and the metal tube (1) is improved by the annular unevenness. The dropout prevention effect is enhanced. In the eighth embodiment shown in FIG. 10, the distal end of the metal tube (1) is enlarged to provide a long enlarged portion (8), and the entire outer periphery of the enlarged portion (8) is covered. The flexible hose (3) made of resin is mounted as described above.
[0039]
In the ninth embodiment shown in FIG. 11, a long enlarged portion (8) is provided at the tip of the metal tube (1), and a saw-tooth wall (11) is further provided on the enlarged portion (8). Two annular bulges (12) are formed. In the tenth embodiment shown in FIG. 12, a guide spool (4) is provided on a metal tube (1), and a fourth spool is provided between the tip of the metal tube (1) and the guide spool (4). An annular bulge (12) having a shape different from those of the fifth and ninth embodiments and having a circular arc cross section is provided. Also in the fourth to tenth embodiments, a highly reliable airtightness can be obtained in the connection structure between the metal pipe (1) and the flexible hose (3) made of resin by welding of the resin, and the expansion is achieved. By providing the diameter portion (8), the small diameter portion (10), and the annular bulge portion (12), the connection structure has a highly reliable airtightness and a detachment prevention effect due to the annular unevenness formed on the metal tube (1). Can be provided.
[0040]
【The invention's effect】
The present invention is configured as described above. 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 The connection between the small-diameter metal tube and the resin-made flexible hose is made by welding the resin between the resin coating provided on the outer periphery of the metal tube and the resin-made flexible hose. Can be obtained. After the connection, the metal tube does not easily come off from the resin flexible hose due to vibration or other stimuli during use of the device, and good use is maintained. In addition, such a highly airtight connection structure can be easily implemented only by welding resin, and does not require members such as a seal ring member and a tightening band, and increases the number of parts and the number of assembly steps. And a cheaper product can be obtained.
[0041]
When a material different from the resin coating of the metal tube is arranged on the inner periphery of the resin flexible hose depending on the type of fluid flowing through the inside and other purposes of use, the metal tube and the resin flexible hose may be used. It is possible to attach a resin sleeve to the outer periphery of the connection portion between the metal tube and the metal tube and the resin flexible hose via the resin sleeve in an airtight manner. That is, by welding the resin sleeve and the resin on the outer periphery of the resin flexible hose, and by welding the resin sleeve and the resin coating of the metal tube, a highly reliable metal tube and the resin flexible hose can be formed. The connection can be made in an airtight manner, and the detachment prevention effect is also high.
[Brief description of the drawings]
FIG. 1 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a connection process between the resin flexible hose and the metal pipe of the first embodiment.
FIG. 3 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a second embodiment.
FIG. 4 is a cross-sectional view showing a connection process between a resin flexible hose and a metal tube according to a second embodiment.
FIG. 5 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a third embodiment.
FIG. 6 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a fourth embodiment.
FIG. 7 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a fifth embodiment.
FIG. 8 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a sixth embodiment.
FIG. 9 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a seventh embodiment.
FIG. 10 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to an eighth embodiment.
FIG. 11 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a ninth embodiment.
FIG. 12 is a sectional view of a connection structure between a resin flexible hose and a metal tube according to a tenth embodiment.
[Explanation of symbols]
DESCRIPTION OF
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002210620A JP4587434B2 (en) | 2002-07-19 | 2002-07-19 | Connection structure between thin metal pipe and resin flexible hose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002210620A JP4587434B2 (en) | 2002-07-19 | 2002-07-19 | Connection structure between thin metal pipe and resin flexible hose |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2004052888A true JP2004052888A (en) | 2004-02-19 |
| JP2004052888A5 JP2004052888A5 (en) | 2005-10-27 |
| JP4587434B2 JP4587434B2 (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002210620A Expired - Fee Related JP4587434B2 (en) | 2002-07-19 | 2002-07-19 | Connection structure between thin metal pipe and resin flexible hose |
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| JP (1) | JP4587434B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017020055A (en) * | 2015-07-07 | 2017-01-26 | トヨタ自動車株式会社 | High frequency induction heating method |
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2002
- 2002-07-19 JP JP2002210620A patent/JP4587434B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017020055A (en) * | 2015-07-07 | 2017-01-26 | トヨタ自動車株式会社 | High frequency induction heating method |
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| Publication number | Publication date |
|---|---|
| JP4587434B2 (en) | 2010-11-24 |
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