JP4655449B2

JP4655449B2 - Sphere-shaped sealing body and method for manufacturing the same

Info

Publication number: JP4655449B2
Application number: JP2002372196A
Authority: JP
Inventors: 一稔若月; 良和坂入
Original assignee: Oiles Corp
Current assignee: Oiles Corp
Priority date: 2002-12-24
Filing date: 2002-12-24
Publication date: 2011-03-23
Anticipated expiration: 2022-12-24
Also published as: JP2004204879A

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車排気管の球面管継手に使用される球帯状シール体及びその製造方法に関する。
【０００２】
【従来の技術】
【特許文献１】
特公昭５８−２１１４４号公報
【特許文献２】
特公平１−１７０３３号公報
【特許文献３】
実公昭６３−２５２９８号公報
【０００３】
自動車のエンジンの排気ガスは、排気管に導かれて大気中に放出されるが、この排気管は、エンジンのトルク反力及び慣性力などにより、繰返し曲げ応力を受ける。とくに、前輪駆動横置きエンジンの場合には、縦置きエンジンの場合に比較して、この曲げ応力はかなり大きいものとなる。したがって、エンジンの振動が排気管つり架具を伝わって車室内にもたらされたり、あるいは、騒音の原因となるばかりでなく、排気管の疲労強度低下を招く虞がある。
【０００４】
【発明が解決しようとする課題】
このような問題を解決するために、排気管の所要箇所に球面管継手を配置して応力を吸収させるなどの手段が講じられているが、球面管継手の摺接面に配置されるシール体の耐熱性の問題と、高温下における摩擦摩耗の問題がある。このような問題を解決するものとして、膨張黒鉛、雲母などの耐火材をワイヤメッシュで補強した排気シールが提案されている（特許文献１所載）。
【０００５】
この排気シールは、上記問題に対処し得るものであるが、近年の自動車エンジンの性能向上等に起因する新たな問題点が提起された。すなわち、自動車エンジンの性能向上に起因する排気ガス温度の上昇により、または自動車のＮＶＨ特性（車輌音響振動特性）の向上を目的として、排気ガスの出口（マニホールド）付近に球面管継手を配置する場合、球面管継手がエンジン側により近づくことに起因する排気ガス温度の上昇により、シール体に該排気ガスの熱が伝達されて該シール体に熱が蓄積され、とくにシール体が大気中に露出する部位に酸化を生起せしめ、これによりシール体の酸化消耗、ひいてはシール体の耐久性の問題があり、シール体への排気ガス熱の断熱手段を考慮しなければ使用し難いという問題がある。
【０００６】
排気シールの耐熱性を高める手段としては、例えば膨張黒鉛、雲母などの耐火材自体を改質して耐熱性を付与する方法と、排気シールへの排気ガスの熱の伝達を極力抑える方法などが考えられる。後者の方法として、排気シールが固着される排気管構造を二重構造とする方法が提案されている（特許文献２所載）。しかしながら、この方法は排気管球面継手自体のコスト高に繋がるという問題がある。
【０００７】
また、他の方法として、シールリングとこのシールリングが固着される排気管との間に断熱性材料からなるブッシュを固定する方法が提案されている（特許文献３所載）。しかしながら、シールリングは排気管の外周面に固定された断熱性材料からなるブッシュの外周面に固着されるため、該ブッシュとシールリングとの間の密封性の問題と、シールリングが該ブッシュの外周面で揺動回転し、シールリングと該ブッシュとの摺動により往々にして異常摩擦音を発生させる虞がある。
【０００８】
本発明は、上記諸点に鑑みてなされたものであり、その目的とするところは、相手材と摺接する外面への排気ガスの熱の伝達を極力抑え、該熱に起因する外面の酸化消耗を抑え、耐久性を高めることができると共に排気ガス温度の低下を防ぐことができる自動車排気管の球面継手に使用される球帯状シール体及びその製造方法を提供することにある。
【０００９】
【課題を解決するための手段】
本発明の第一の態様の球帯状シール体は、円筒内面と部分凸球面状面と部分凸球面状面の大径側及び小径側の環状の端面とにより規定された球帯状基体と、この球帯状基体の部分凸球面状面に一体的に形成された外層とを備えた球帯状シール体であって、球帯状基体は、圧縮された金網からなる補強材と、この補強材の金網の網目を充填し、かつこの補強材と混在一体化されて圧縮された膨張黒鉛からなる耐熱材と、該補強材及び耐熱材と相互に絡み合って円周方向に広がると共に厚さ方向に複数個の孔を備えた断熱シート材又はセラミックシート若しくはペーパーからなる断熱シート材からなる少なくとも一層の断熱層とを有しており、外層は、膨張黒鉛からなる耐熱材と、この耐熱材に混在一体化された金網からなる補強材とを有しており、外層において外部に露出した部分凸球面状の外面は、前記耐熱材と補強材とが混在一体化された平滑な面となっていることを特徴とする。
【００１０】
第一の態様の球帯状シール体によれば、円筒内面と部分凸球面状面と部分凸球面状面の大径側及び小径側の環状の端面とにより規定された球帯状基体は、圧縮された金網からなる補強材と、この補強材の金網の網目を充填し、かつこの補強材と混在一体化されて圧縮された膨張黒鉛からなる耐熱材と、該補強材及び耐熱材と相互に絡み合って円周方向に広がる少なくとも一層の断熱層とを有しているため、大気中に露出する外層側への排気管を導通する排気ガスの熱の伝達が少なくとも一層の断熱層により抑えられるので、当該外層部位での高温酸化による酸化消耗が抑制されることになり、酸化消耗に起因する球帯状シール体の密封性等の耐久性を高めることができる。
【００１１】
また、外層は、膨張黒鉛からなる耐熱材と、この耐熱材に混在一体化された金網からなる補強材とを有しており、外層において外部に露出した部分凸球面状の外面は、前記耐熱材と補強材とが混在一体化された平滑な面となっている結果、該外層への排気ガスの熱の伝達が抑えられて当該外層部位での酸化消耗が抑制されるていることと相俟って相手材との摺接においては、相手材表面に外層を形成する耐熱材の過剰な被膜の形成を抑制し、相手材表面との円滑な摺接が行われるので、球帯状シール体の密封性等の耐久性を高めることができる。
【００１２】
本発明の第二の態様の球帯状シール体では、上記第一の態様の球帯状シール体において、外層は、潤滑滑り材からなる潤滑被覆層とこの潤滑被覆層に混在一体化された金網からなる補強材とを有しており、外層において外部に露出した部分凸球面状の外面は、前記潤滑滑り材と補強材とが混在一体化された平滑な潤滑すべり面となっており、この潤滑滑り材は、好ましくは本発明の第三の態様のように、四ふっ化エチレン樹脂及び窒化ホウ素のうちの少なくとも一つからなる。
【００１３】
第二及び第三の態様の球帯状シール体によれば、外層において外部に露出した部分凸球面状の外面は、平滑な面であって、しかも、潤滑滑り材と補強材とが混在一体化された平滑な潤滑すべり面となっているので、相手材との摺接において円滑な摺動が行われる。
【００１４】
本発明の第四の態様の球帯状シール体では、上記第一から第三のいずれかの態様の球帯状シール体において、断熱層は、セラミックシート又はペーパーからなり、このセラミックシート又はペーパーは、好ましくは本発明の第五の態様の球帯状シール体のように、珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択された断熱材からなる。
【００１５】
第四及び第五の態様の球帯状シール体によれば、好ましくは珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択された断熱材からなるセラミックシート又はペーパーは、球帯状シール体の球帯状基体内に円周方向に広がって配置されることにより、球帯状基体内に断熱層を形成するので、排気管を導通する排気ガスの熱の球帯状シール体の外層側への伝達を極力抑えることができる。
【００１６】
本発明の第六の態様の球帯状シール体では、第一から第五のいずれかの態様の球帯状シール体において、球帯状基体の膨張黒鉛からなる耐熱材が円筒内面において露出している。
【００１７】
第六の態様の球帯状シール体によれば、球帯状シール体が排気管の外面に嵌合固定された際、球帯状シール体の円筒内面と排気管の外面との間の密封性が円筒内面の膨張黒鉛からなる耐熱材により高められるので、当該接触面からの排気ガスの漏洩を極力防ぐことができる。
【００１８】
本発明の第七の態様の球帯状シール体では、第一から第五のいずれかの態様の球帯状シール体において、球帯状基体の金網からなる補強材が円筒内面において露出している。
【００１９】
第七の態様の球帯状シール体によれば、球帯状基体の金網からなる補強材が円筒内面において露出しているので、球帯状シール体を排気管の外面に嵌合固定する際、円筒内面と排気管の外面との間の摩擦が円筒内面における金網からなる補強材により高められ、結果として球帯状シール体が排気管の外面に強固に固定されることになる。
【００２０】
円筒内面と部分凸球面状面と該部分凸球面状面の大径側及び小径側の環状の端面とにより規定された球帯状基体と、この球帯状基体の部分凸球面状面に一体的に形成された外層とを備えた本発明の第一の態様の球帯状シール体の製造方法は、膨張黒鉛からなる耐熱シート材と厚さ方向に複数個の孔を備えた断熱シート材又はセラミックシート若しくはペーパーからなる断熱シート材と金網からなる補強材とを重ね合わせたのち、この重合体をうず巻き状に捲回して筒状母材を形成する工程と、別の耐熱シート材を準備し、該別の耐熱シート材と該別の耐熱シート材を覆って配した金網からなる別の補強材とからなる外面層形成部材を形成する工程と、該外面層形成部材を前記筒状母材の外周面に捲回して予備円筒成形体を形成する工程と、該予備円筒成形体を金型のコア外周面に挿入し、該コアを金型内に配置すると共に該金型内において予備円筒成形体をコア軸方向に圧縮成形する工程とからなり、ここで、球帯状基体は、断熱シート材と金網からなる補強材とが圧縮され、互いに絡み合って構造的一体性を有するように構成されて、圧縮された金網からなる補強材と、この補強材の金網の網目を充填し、かつこの補強材と混在一体化されて圧縮された膨張黒鉛からなる耐熱材と、該補強材及び耐熱材と相互に絡み合った断熱シート材からなる円周方向に広がる少なくとも一層の断熱層とを含んでおり、外層は、膨張黒鉛からなる耐熱材と、この耐熱材に混在一体化された金網からなる補強材とを有しており、外層において外部に露出した部分凸球面状の外面は、前記耐熱材と補強材とが混在一体化された平滑な面となっていることを特徴とする。
【００２１】
第一の態様の製造方法によれば、断熱シート材はその厚さ方向に複数個の孔を備えているので、圧縮工程において膨張黒鉛からなる耐熱シート材及び金網からなる補強材と相互に絡み合って構造的一体性を有して球帯状基体内の円周方向に広がって断熱層を形成し得る結果、断熱層を有していても強固に一体化された球帯状シール体を得ることができる。
【００２２】
円筒内面と部分凸球面状面と該部分凸球面状面の大径側及び小径側の環状の端面とにより規定された球帯状基体と、この球帯状基体の部分凸球面状面に一体的に形成された外層とを備えた本発明の第二の態様の球帯状シール体の製造方法は、膨張黒鉛からなる耐熱シート材と厚さ方向に複数個の孔を備えた断熱シート材又はセラミックシート若しくはペーパーからなる断熱シート材と金網からなる補強材とを重ね合わせたのち、この重合体をうず巻き状に捲回して筒状母材を形成する工程と、一方の表面に潤滑滑り材からなる潤滑被覆層を備えた別の耐熱シート材を準備し、該別の耐熱シート材と該別の耐熱シート材の潤滑被覆層を覆って配した金網からなる別の補強材とからなる外面層形成部材を形成する工程と、該外面層形成部材を前記筒状母材の外周面に捲回して予備円筒成形体を形成する工程と、該予備円筒成形体を金型のコア外周面に挿入し、該コアを金型内に配置すると共に該金型内において予備円筒成形体をコア軸方向に圧縮成形する工程とからなり、ここで、球帯状基体は、断熱シート材と金網からなる補強材とが圧縮され、互いに絡み合って構造的一体性を有するように構成されて、圧縮された金網からなる補強材と、この補強材の金網の網目を充填し、かつこの補強材と混在一体化されて圧縮された膨張黒鉛からなる耐熱材と、該補強材及び耐熱材と相互に絡み合った断熱シート材からなる円周方向に広がる少なくとも一層の断熱層とを含んでおり、外層は、潤滑滑り材からなる潤滑被覆層と、この潤滑被覆層に混在一体化された金網からなる補強材とを有しており、外層において外部に露出した部分凸球面状の外面は、前記潤滑滑り材と補強材とが混在一体化された平滑な潤滑すべり面となっていることを特徴とする。
【００２３】
第二の態様の製造方法によれば、第一の態様の製造方法と同様に、断熱シート材はその厚さ方向に複数個の孔を備えているので、圧縮工程において膨張黒鉛からなる耐熱シート材及び金網からなる補強材と相互に絡み合って構造的一体性を有して球帯状基体内の円周方向に広がって断熱層を形成し得る結果、断熱層を有していても強固に一体化された球帯状シール体を得ることができる。
【００２４】
また、第二の態様の製造方法によれば、別の耐熱シート材がその一方の表面に潤滑滑り材からなる潤滑被覆層を備えているために、圧縮工程により展延された潤滑滑り材からなる潤滑被覆層とこの潤滑被覆層に混在一体化された金網からなる補強材とを有した外層を形成でき、而して、展延された潤滑滑り材と補強材とが混在一体化された平滑な潤滑すべり面として外層において外部に露出した部分凸球面状の外面を形成することができる。
【００２５】
この潤滑滑り材としては、好ましくは第三の態様の球帯状シール体の製造方法のように、四ふっ化エチレン樹脂及び窒化ホウ素のうちの少なくとも一つからなる。
【００２６】
本発明の第四の態様の球帯状シール体の製造方法では、第一から第三の態様の球帯状シール体の製造方法において、断熱シート材は、セラミックシート又はペーパーからなり、セラミックシート又はペーパーは、第五の態様の球帯状シール体の製造方法のように、珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択された断熱材からなるとよい。
【００２７】
斯かる断熱シート材は、球帯状基体内に補強材及び耐熱材と相互に絡み合って円周方向に広がる断熱層を形成する。
【００２８】
本発明の第六の態様の球帯状シール体の製造方法では、第一から第五のいずれかの態様の球帯状シール体の製造方法において、重合体を耐熱シート材を内側にしてうず巻き状に捲回して筒状母材を形成する。
【００２９】
第六の態様の製造方法によれば、円筒内面において球帯状基体の膨張黒鉛からなる耐熱材が露出している球帯状シール体を製造できる。
【００３０】
本発明の第七の態様の球帯状シール体の製造方法は、第一から第五のいずれかの態様の球帯状シール体の製造方法において、重合体を金網からなる補強材を内側にしてうず巻き状に捲回して筒状母材を形成する。
【００３１】
第七の態様の製造方法によれば、円筒内面において球帯状基体の金網からなる補強材が露出している球帯状シール体を製造できる。
【００３２】
以下、本発明及びその実施の形態を、図面に示す好ましい例に基づいて説明する。なお、本発明はこれらの例に何等限定されないのである。
【００３３】
【発明の実施の形態】
本発明の球帯状シール体における構成材料及び球帯状シール体の製造方法について説明する。
【００３４】
＜耐熱シート材について＞
酸処理黒鉛原料を高温、例えば１０００℃の温度で加熱（膨張）処理を施して、分解ガスを発生せしめ、そのガス圧により黒鉛層間を拡張して膨張黒鉛粒子を形成し、この膨張黒鉛粒子をロール成形して得られる膨張黒鉛からなる耐熱シート材が使用される。
【００３５】
＜補強材について＞
補強材には、鉄系としてオーステナイト系のＳＵＳ３０４もしくはＳＵＳ３１６又はフェライト系のＳＵＳ４３０等のステンレス鋼線又は鉄線（ＪＩＳ−Ｇ−３５３２）もしくは亜鉛メッキ鉄線（ＪＩＳ−Ｇ−３５４７）、また銅系として銅−ニッケル合金（白銅）、銅−ニッケル−亜鉛合金（洋白）、黄銅、ベリリウム銅からなる線径０．１０〜０．３２ｍｍ程度の細線材を１本又は２本以上使用して織ったり、編んだりして形成された網目３〜６ｍｍ程度の金網が使用される。
【００３６】
＜断熱材について＞
断熱材には、珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択されるものが好適に使用され、断熱シート材には、斯かる珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択された断熱材からなるセラミックシート又はペーパーが使用される。この断熱シート材は、０．５〜１．０ｍｍの厚さを有し、厚さ方向に複数個の孔を具備している。
【００３７】
つぎに、上記構成材料からなる球帯状シール体の製造方法について図面に基づき説明する。
【００３８】
＜第一の態様の球帯状シール体の製造方法＞
（第一工程）図２に示すように金属細線を円筒状に編んで形成した筒状金網１をローラ２及び３間に通して所定の幅Ｄの帯状の金網４を作製し、帯状の金網４を所定の長さＬに切断した補強材５、又は金属細線を織ったり、編んだりすることによって直接形成される帯状金網を所定の幅Ｄと長さＬとに切断した補強材５を準備する。
【００３９】
（第二工程）図３に示すように、補強材５の幅Ｄに対して１．１×Ｄから２．１×Ｄの幅ｄを有すると共に、補強材５の長さＬに対して１．３０×Ｌから２．７０×Ｌの長さｌを有するように切断された膨張黒鉛からなる耐熱シート材６を準備する。
【００４０】
（第三工程）図４に示すように、前記補強材５と同様の幅Ｄと長さＬとを有し、厚さ方向に複数個の孔７を有すると共に珪酸カルシウム、酸化アルミニウム、炭化ケイ素から選択された断熱材製のセラミックシート又はペーパーからなる断熱シート材８を準備する。
【００４１】
（第四工程）後述する球帯状シール体５８又は６１において、部分凸球面状面５３の軸方向の少なくとも一方の端縁側の環状の端面である大径側の端面５４に全体的に膨張黒鉛からなる耐熱材が露出するようにすべく、図５に示すように、部分凸球面状面５３の大径側の環状の端面５４となる補強材５及び断熱シート材８の幅方向の少なくとも一方の端縁９から最大で０．１×Ｄから０．８×Ｄのはみ出し量δ１だけ耐熱シート材６が幅方向にはみ出すと共に、端縁９からの耐熱シート材６の幅方向のはみ出し量δ１が部分凸球面状面５３の小径側の端面５５となる補強材５及び断熱シート材８の幅方向の他方の端縁１０からのはみ出し量δ２よりも多くなるようにし、しかも、補強材５の長さ方向の一方の端縁１１から最大で０．３０×Ｌから１．７０×Ｌだけ耐熱シート材６が長さ方向にはみ出すと共に、補強材５及び断熱シート材８の長さ方向の他方の端縁１２と当該端縁１２に対応する耐熱シート材６の長さ方向の端縁１３とを実質的に一致させて、補強材５と断熱シート材８と耐熱シート材６との幅方向及び長さ方向を合致させて当該補強材５と断熱シート材８と耐熱シート材６とを互いに重ね合わせた重合体１４を作製する。
【００４２】
（第五工程）重合体１４を図６に示すように耐熱シート材６を内側にしてうず巻き状であって耐熱シート材６が１回多くなるように捲回して、内周側及び外周側の両方に耐熱シート材６が露出した筒状母材１５を形成する。耐熱シート材６としては、筒状母材１５における耐熱シート材６の巻き回数が補強材５及び断熱シート材８の巻き回数よりも多くなるように、補強材５及び断熱シート材８の長さＬに対して１．３０×Ｌから２．７０×Ｌの長さｌを有したものが予め準備される。筒状母材１５においては、図７に示すように、耐熱シート材６は、幅方向の一方の端縁側において補強材５及び断熱シート材８の一方の端縁９から幅方向にδ１だけはみ出しており、また耐熱シート材６の幅方向の他方の端縁側において補強材５及び断熱シート材８の他方の端縁１０から幅方向にδ２だけはみ出している。
【００４３】
（第六工程）前記耐熱シート材６と同様であるが、幅Ｄよりも小さい幅Ｗを有すると共に筒状母材１５を１回巻きできる程度の長さＹを有した図８に示すような耐熱シート材６を別途用意する。一方、前記第一工程で説明したように、金属細線を編んで筒状金網１を形成したのち、これをローラ２及び３間に通して作製した帯状の金網４からなる補強材５を別に準備し、図９に示すように、帯状の金網４内に、耐熱シート材６を挿入するとともに、これらを図１０に示すように、ローラ１６及び１７間に通して一体化させ、これにより別の耐熱シート材６と該別の耐熱シート材６を覆って配した帯状の金網４からなる別の補強材５とからなる外面層形成部材１８を形成する。
【００４４】
（第七工程）このようにして得た外面層形成部材１８を前記筒状母材１５の外周面に捲回し、図１１に示すような予備円筒成形体１９を作製する。
【００４５】
（第八工程）内面に円筒壁面３１と円筒壁面３１に連なる部分凹球面壁面３２と部分凹球面壁面３２に連なる貫通孔３３とを備え、貫通孔３３に段付きコア３４を嵌挿することによって内部に中空円筒部３５と該中空円筒部３５に連なる球帯状中空部３６とが形成された図１２に示すような金型３７を準備し、該金型３７の段付きコア３４に予備円筒成形体１９を挿入する。
【００４６】
金型３７の中空円筒部３５及び球帯状中空部３６に位置せしめられた予備円筒成形体１９をコア軸方向に１〜３トン／ｃｍ^２の圧力で圧縮成形し、図１に示すような、中央部に貫通孔５１を有すると共に、円筒内面５２と部分凸球面状面５３と部分凸球面状面５３の大径側及び小径側の環状の端面５４及び５５とにより規定された球帯状基体５６と、球帯状基体５６の部分凸球面状面５３に一体的に形成された外層５７とを備えた球帯状シール体５８を作製する。
【００４７】
この圧縮成形により、球帯状基体５６は、耐熱シート材６と金網からなる補強材５とが圧縮され、互いに絡み合って構造的一体性を有するように構成されて、圧縮された金網からなる補強材５と、この補強材５の金網の網目を充填し、かつ耐熱シート材６が圧縮されてなると共に補強材５と混在一体化された膨張黒鉛からなる耐熱材と、該補強材５及び耐熱材と相互に絡み合って円周方向に広がると共に断熱シート材８の断熱材からなる断熱層５９とを有しており、外層５７は、耐熱シート材６が圧縮された膨張黒鉛からなる耐熱材と、この耐熱材に混在一体化された金網からなる補強材５とを有しており、外層５７において外部に露出した部分凸球面状の外面６０は平滑な面に形成され、貫通孔５１を規定する円筒内面５２において耐熱シート材６が圧縮された膨張黒鉛からなる耐熱材が露出して形成される。
【００４８】
上述した方法によって作製された図１に示す球帯状シール体５８において、耐熱シート材６は、内部構造を形成する金網からなる補強材５と絡み合って一体となっており、部分凸球面状の外面６０は、外面層形成部材１８によって形成された膨張黒鉛からなる耐熱材の外面層と金網からなる補強材５とが混在一体となった平滑な面に形成されていると共に、部分凸球面状面５３の大径側の環状の端面５４及び小径側の端面５５は、補強材５から幅方向にはみ出した耐熱シート材６が部分凸球面状面５３の大径側の環状の端面５４及び小径側の端面５５に曲折され、かつ展延されることによって膨張黒鉛からなる耐熱材でもって形成されている。
【００４９】
上述した製造方法の第三工程において、断熱シート材８の長さＬを適宜調整することにより、球帯状基体５６中に断熱シート材８からなる断熱層５９の層数を適宜調整することができる。また、前述の第二工程において、補強材５及び断熱シート材８の長さＬに対して実質的に同じ長さｌを有するように切断された耐熱シート材６を準備して、これらを前述の第四工程と同様に重ね合わせて重合体１４を得、この重合体１４を補強材５を内側にして前述の第五工程と同様にして筒状母材１５を形成し、以下、第六工程から第八工程を経て、貫通孔５１を規定する円筒内面５２において球帯状基体５６の金網からなる補強材５が露出している球帯状シール体５８を作製することができる。
【００５０】
＜第二の態様の球帯状シール体の製造方法＞
第一工程から第五工程までは上記第一工程から第五工程までと同じ。
【００５１】
（第六工程）前記耐熱シート材６と同様であるが、幅Ｄよりも小さい幅Ｗを有すると共に筒状母材１５を１回巻きできる程度の長さＹを有した耐熱シート材６を別途準備し、この耐熱シート材６の一方の表面に四ふっ化エチレン樹脂、窒化ホウ素のうちの少なくとも一つからなる潤滑滑り材の水性ディスパージョンを刷毛塗り、ローラ塗り、スプレー等の手段で被覆し、これを乾燥させて図１３に示すような潤滑滑り材からなる潤滑被覆層２０を形成する。
【００５２】
前記第六工程で説明した帯状の金網４からなる補強材５を別途準備し、図１４に示すように帯状の金網４内に、一方の表面に潤滑滑り材からなる潤滑被覆層２０を備えた耐熱シート材６を挿入すると共にこれらを図１５に示すように、ローラ２１及び２２間に通して一体化させ、これにより別の耐熱シート材６と該別の耐熱シート材６の潤滑被覆層２０を覆って配した帯状の金網４からなる別の補強材５とからなる外面層形成部材２３を形成する。
【００５３】
（第七工程）このようにして得た外面層形成部材２３を潤滑被覆層２０を外側にして前記筒状母材１５の外周面に捲回し、図１６に示すような予備円筒成形体２４を作製する。この予備円筒成形体２４を前記第八工程と同様な方法で圧縮成形し、図１７及び図１８に示すような、中央部に貫通孔５１を有すると共に、円筒内面５２と部分凸球面状面５３と部分凸球面状面５３の大径側及び小径側の環状の端面５４及び５５とにより規定された球帯状基体５６と、球帯状基体５６の部分凸球面状面５３に一体的に形成された外層５７とを備えた球帯状シール体６１を作製する。
【００５４】
この圧縮成形により、球帯状基体５６は、耐熱シート材６と金網からなる補強材５とが圧縮され、互いに絡み合って構造的一体性を有するように構成されて、圧縮された金網からなる補強材５と、この補強材５の金網の網目を充填し、かつ耐熱シート材６が圧縮されてなると共に補強材５と混在一体化された膨張黒鉛からなる耐熱材と、該補強材５及び耐熱材と相互に絡み合って円周方向に広がると共に断熱シート材８の断熱材からなる断熱層５９とを有しており、外層５７は、潤滑被覆層２０と該被覆層２０に一体化された金網からなる補強材５とが圧縮され、互いに絡み合って構造的一体性を有するように構成されて、潤滑滑り材からなる潤滑被覆層２０とこの潤滑被覆層２０に混在一体化された金網からなる補強材５とを有しており、外層５７において外部に露出した部分凸球面状の外面６０は、潤滑被覆層２０の潤滑滑り材と補強材５とが混在一体化された平滑な潤滑すべり面となり、貫通孔５１を規定する円筒内面５２において耐熱シート材６が圧縮された膨張黒鉛からなる耐熱材が露出して形成されており、部分凸球面状面５３の大径側の環状の端面５４及び小径側の端面５５は、補強材５から幅方向にはみ出した耐熱シート材６が部分凸球面状面５３の大径側の環状の端面５４及び小径側の端面５５に曲折され、かつ展延されることによって膨張黒鉛からなる耐熱材でもって形成されている。
【００５５】
この第二の態様の球帯状シール体６１においても、上述した製造方法の第三工程において、断熱シート材８の長さＬを適宜調整することにより、球帯状基体５６中に断熱シート材８からなる断熱層５９の層数を適宜調整することができる。また、前述の第二工程において、補強材５及び断熱シート材８の長さＬに対して実質的に同じ長さｌを有するように切断された耐熱シート材６を準備して、これらを前述の第四工程と同様に重ね合わせて重合体１４を得、この重合体１４を補強材５を内側にして前述の第五工程と同様にして筒状母材１５を形成し、以下、第六工程から第八工程を経て、貫通孔５１における円筒内面５２に球帯状基体５６の金網からなる補強材５が露出している球帯状シール体６１を作製することができる。
【００５６】
球帯状シール体５８又は６１は、例えば図１９に示す排気管球面継手に組込まれて使用される。すなわち、エンジン側に連結された上流側排気管１００の外周面には、管端部１０１を残してフランジ２００が立設されており、管端部１０１には、球帯状シール体５８又は６１が貫通孔５１を規定する円筒内面５２において嵌合されており、大径側端面５４において球帯状シール体５８又は６１がフランジ２００に当接されて着座せしめられている。上流側排気管１００と相対峙してマフラー側に連結され、端部に凹球面部３０２と凹球面部３０２の開口部周縁にフランジ部３０３とを備えた径拡大部３０１が一体に形成された下流側排気管３００が凹球面部３０２を球帯状シール体５８又は６１の部分凸球面状の外面６０に摺接させて配置されている。
【００５７】
図１９に示す排気管球面継手において、一端がフランジ２００に固定され、他端が径拡大部３０１のフランジ部３０３を挿通して配された一対のボルト４００とボルト４００の膨大頭部及びフランジ部３０３の間に配された一対のコイルバネ５００とにより、下流側排気管３００には、常時、上流側排気管１００方向にバネ力が付勢されている。そして、排気管球面継手は、上、下流側排気管１００、３００に生じる相対角変位に対しては、球帯状シール体５８又は６１の部分凸球面状の外面６０と下流側排気管３００の端部に形成された径拡大部３０１の凹球面部３０２との摺接でこれを許容するように構成されている。
【００５８】
排気管球面継手に組込まれた球帯状シール体５８又は６１は、その球帯状基体５６内に形成された断熱層５９により、該球帯状シール体５８又は６１が嵌合着座せしめられた上流側排気管１００を導通する排気ガスの熱の伝達が極力抑えられているので、とくに、該球帯状シール体５８又は６１の大気中に曝される部分凸球面状の外面６０への排気ガス熱の影響が抑えられるので、当該部分凸球面状の外面６０における高温酸化が極力抑えられる結果、球帯状シール体５８又は６１の酸化消耗、ひいては酸化消耗に起因するシール性の低下等を生じることがない。
【００５９】
また、球帯状シール体５８においては、外層５７は、膨張黒鉛からなる耐熱材と、この耐熱材に混在一体化された金網４からなる補強材５とを有しており、外層５７において外部に露出した部分凸球面状の外面６０は、前記耐熱材と補強材５とが混在一体化された平滑な面となっている結果、該外層５７への排気ガスの熱の伝達が抑えられて当該外層５７部位での酸化消耗が抑制されていることと相俟って相手材との摺接においては、相手材表面に外層５７を形成する耐熱材の過剰な被膜の形成を抑制し、相手材表面との円滑な摺接が行われるので、球帯状シール体５８の密封性等の耐久性を高めることができ、球帯状シール体６１においては、外層５７において外部に露出した部分凸球面状の外面６０は、平滑な面であって、しかも、潤滑滑り材と補強材５とが混在一体化された平滑な潤滑すべり面となっているので、相手材との摺接において円滑な摺動が行われる。
【００６０】
【発明の効果】
本発明によれば、相手材と摺接する外面への排気ガスの熱の伝達を極力抑え、該熱に起因する外面の酸化消耗を抑え、耐久性を高めることができると共に排気ガス温度の低下を防ぐことができる自動車排気管の球面継手に使用される球帯状シール体及びその製造方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の球帯状シール体の好ましい一例の縦断面図である。
【図２】本発明の球帯状シール体の製造工程における補強材の形成方法の説明図である。
【図３】本発明の球帯状シール体の製造工程における耐熱シート材の斜視図である。
【図４】本発明の球帯状シール体の製造工程における断熱シート材の斜視図である。
【図５】本発明の球帯状シール体の製造工程における重合体の斜視図である。
【図６】本発明の球帯状シール体の製造工程における筒状母材の平面図である。
【図７】図６に示す筒状母材の縦断面図である。
【図８】本発明の球帯状シール体の製造工程における耐熱シート材の斜視図である。
【図９】本発明の球帯状シール体の製造工程における外面層形成部材の形成方法の説明図である。
【図１０】本発明の球帯状シール体の製造工程における外面層形成部材の形成方法の説明図である。
【図１１】本発明の球帯状シール体の製造工程における予備円筒成形体の平面図である。
【図１２】本発明の球帯状シール体の製造工程における金型中に予備円筒成形体を挿入した状態を示す縦断面図である。
【図１３】本発明の球帯状シール体の製造工程における潤滑被覆層を形成した耐熱シート材の縦断面図である。
【図１４】本発明の球帯状シール体の製造工程における外面層形成部材の形成方法の説明図である。
【図１５】本発明の球帯状シール体の製造工程における外面層形成部材の形成方法の説明図である。
【図１６】本発明の球帯状シール体の製造工程における予備円筒成形体の平面図である。
【図１７】本発明の球帯状シール体の他の好ましい例の縦断面図である。
【図１８】図１７に示す例の部分凸球面状外面の部分拡大断面図である。
【図１９】図１及び図１７の例の球帯状シール体を組込んだ排気管球面継手の縦断面図である。
【符号の説明】
４金網
５補強材
５２円筒内面
５３部分凸球面状面
５４、５５端面
５６球帯状基体
５７外層
５８球帯状シール体
５９断熱層
６０外面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ball-shaped seal body used for a spherical pipe joint of an automobile exhaust pipe and a manufacturing method thereof.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Publication No.58-21144
[Patent Document 2]
Japanese Examined Patent Publication No. 1-17033
[Patent Document 3]
Japanese Utility Model Publication No. 63-25298
[0003]
The exhaust gas of an automobile engine is guided to an exhaust pipe and released into the atmosphere. This exhaust pipe is subjected to repeated bending stress due to the torque reaction force and inertia force of the engine. In particular, in the case of a front-wheel drive horizontal engine, this bending stress is considerably larger than that of a vertical engine. Therefore, the vibration of the engine may be brought into the passenger compartment through the exhaust pipe suspension, or may cause noise, and may cause a reduction in fatigue strength of the exhaust pipe.
[0004]
[Problems to be solved by the invention]
In order to solve such a problem, means such as arranging a spherical pipe joint at a required location of the exhaust pipe to absorb the stress is taken, but the seal body arranged on the sliding contact surface of the spherical pipe joint There are problems of heat resistance and frictional wear at high temperatures. In order to solve such a problem, an exhaust seal in which a refractory material such as expanded graphite and mica is reinforced with a wire mesh has been proposed (Patent Document 1).
[0005]
Although this exhaust seal can cope with the above-mentioned problems, new problems have been raised due to the recent improvement in performance of automobile engines. That is, when a spherical pipe joint is arranged near the exhaust gas outlet (manifold) for the purpose of improving the NVH characteristic (vehicle acoustic vibration characteristic) of the automobile due to the increase in the exhaust gas temperature resulting from the performance improvement of the automobile engine The exhaust gas temperature rises due to the spherical pipe joint being closer to the engine side, so that the heat of the exhaust gas is transmitted to the seal body, and the heat is accumulated in the seal body. In particular, the seal body is exposed to the atmosphere. Oxidation occurs at the site, which causes oxidation problems of the sealing body, and thus durability of the sealing body, and there is a problem that it is difficult to use unless heat insulation means for exhaust gas heat to the sealing body is taken into consideration.
[0006]
Examples of means for improving the heat resistance of the exhaust seal include a method of imparting heat resistance by modifying a refractory material itself such as expanded graphite and mica, and a method of suppressing heat transfer of exhaust gas to the exhaust seal as much as possible. Conceivable. As the latter method, a method has been proposed in which the exhaust pipe structure to which the exhaust seal is fixed has a double structure (described in Patent Document 2). However, this method has a problem that it leads to high cost of the exhaust pipe spherical joint itself.
[0007]
As another method, a method of fixing a bush made of a heat insulating material between a seal ring and an exhaust pipe to which the seal ring is fixed has been proposed (Patent Document 3). However, since the seal ring is fixed to the outer peripheral surface of the bush made of a heat insulating material fixed to the outer peripheral surface of the exhaust pipe, the sealing problem between the bush and the seal ring and the seal ring of the bush There is a possibility that abnormal frictional noise is often generated due to the sliding rotation between the seal ring and the bush.
[0008]
The present invention has been made in view of the above-described points, and the object of the present invention is to suppress the heat transfer of the exhaust gas to the outer surface that is in sliding contact with the counterpart material as much as possible, and to reduce the oxidative consumption of the outer surface due to the heat. An object of the present invention is to provide a ball-shaped seal body used for a spherical joint of an automobile exhaust pipe that can suppress and enhance durability and prevent a decrease in exhaust gas temperature, and a method of manufacturing the same.
[0009]
[Means for Solving the Problems]
A spherical belt-shaped sealing body according to a first aspect of the present invention includes a spherical belt-shaped substrate defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large-diameter side and small-diameter side of the partially convex spherical surface, A spherical belt-shaped sealing body including an outer layer integrally formed on a partially convex spherical surface of a spherical belt-shaped substrate, the spherical belt-shaped substrate including a reinforcing material made of a compressed wire mesh, and a wire mesh of the reinforcing material. A heat-resistant material made of expanded graphite filled with a mesh and compressed integrally mixed with the reinforcing material, and intertwined with the reinforcing material and the heat-resistant material spread in the circumferential direction, and a plurality of heat-resistant materials in the thickness direction. It has at least one heat insulating layer made of a heat insulating sheet material made of ceramic sheet or paper with holes, and the outer layer is mixed and integrated with the heat resistant material made of expanded graphite. A reinforcement made of wire mesh , Exposed partially convex spherical outer surface to the outside in the outer layer, characterized in that said heat-resistant material and the reinforcing material is in the mixed integrated smooth surface.
[0010]
According to the spherical belt-shaped sealing body of the first aspect, the spherical belt-shaped substrate defined by the cylindrical inner surface, the partially convex spherical surface, and the annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface is compressed. A reinforcing material made of an open metal mesh, a heat-resistant material made of expanded graphite that is packed together with the reinforcing material and meshed with the reinforcing material, and entangled with the reinforcing material and the heat-resistant material. Since at least one heat insulating layer spreads in the circumferential direction, the heat transfer of the exhaust gas that conducts the exhaust pipe to the outer layer exposed to the atmosphere is suppressed by at least one heat insulating layer, Oxidation consumption due to high-temperature oxidation at the outer layer portion is suppressed, and durability such as sealing performance of the ball-shaped seal body due to oxidation consumption can be enhanced.
[0011]
The outer layer has a heat-resistant material made of expanded graphite and a reinforcing material made of a wire mesh mixed and integrated with the heat-resistant material, and the partially convex spherical outer surface exposed to the outside in the outer layer is the heat-resistant material. As a result of the smooth surface in which the material and the reinforcing material are mixed and integrated, the heat transfer of the exhaust gas to the outer layer is suppressed, and the oxidation consumption in the outer layer part is suppressed. As a result, in sliding contact with the mating material, the formation of an excessive coating of the heat-resistant material that forms the outer layer on the mating material surface is suppressed, and smooth sliding contact with the mating material surface is performed. It is possible to improve durability such as sealing performance.
[0012]
In the spherical belt-shaped sealing body according to the second aspect of the present invention, in the spherical belt-shaped sealing body according to the first aspect, the outer layer is composed of a lubricating coating layer made of a lubricating sliding material and a wire mesh that is mixed and integrated with the lubricating coating layer. The outer surface of the partially convex spherical surface exposed to the outside in the outer layer is a smooth lubricating sliding surface in which the lubricating sliding material and the reinforcing material are mixed and integrated. The sliding material is preferably composed of at least one of ethylene tetrafluoride resin and boron nitride as in the third aspect of the present invention.
[0013]
According to the spherical belt-like sealing body of the second and third aspects, the outer surface of the partially convex spherical surface exposed to the outside in the outer layer is a smooth surface, and the lubricating sliding material and the reinforcing material are mixed and integrated. Since the smooth sliding surface is smoothed, smooth sliding is performed in sliding contact with the counterpart material.
[0014]
In the spherical belt-shaped sealing body according to the fourth aspect of the present invention, in the spherical belt-shaped sealing body according to any one of the first to third aspects, the heat insulating layer is made of a ceramic sheet or paper, and the ceramic sheet or paper is Preferably, it is made of a heat insulating material selected from calcium silicate, aluminum oxide, and silicon carbide as in the ball-shaped seal body of the fifth aspect of the present invention.
[0015]
According to the spherical band-shaped sealing body of the fourth and fifth aspects, the ceramic sheet or paper preferably made of a heat insulating material selected from calcium silicate, aluminum oxide, and silicon carbide is provided in the spherical band-shaped substrate of the spherical band-shaped sealing body. Since the heat-insulating layer is formed in the spherical band-shaped substrate by being arranged in the circumferential direction, it is possible to suppress the transmission of the heat of the exhaust gas conducting through the exhaust pipe to the outer layer side of the spherical band-shaped sealing body as much as possible. .
[0016]
In the spherical belt-shaped sealing body according to the sixth aspect of the present invention, in the spherical belt-shaped sealing body according to any one of the first to fifth aspects, the heat-resistant material made of expanded graphite of the spherical belt-shaped substrate is exposed on the inner surface of the cylinder.
[0017]
According to the sixth embodiment of the ball-shaped seal body, when the ball-shaped seal body is fitted and fixed to the outer surface of the exhaust pipe, the sealing property between the cylindrical inner surface of the ball-shaped seal body and the outer surface of the exhaust pipe is cylindrical. Since it is enhanced by a heat-resistant material made of expanded graphite on the inner surface, it is possible to prevent leakage of exhaust gas from the contact surface as much as possible.
[0018]
In the spherical belt-shaped sealing body according to the seventh aspect of the present invention, in the spherical belt-shaped sealing body according to any one of the first to fifth aspects, the reinforcing material made of a metal mesh of the spherical belt-shaped substrate is exposed on the inner surface of the cylinder.
[0019]
According to the spherical belt-shaped sealing body of the seventh aspect, since the reinforcing material made of the metal mesh of the spherical belt-shaped substrate is exposed on the cylindrical inner surface, when the spherical belt-shaped sealing body is fitted and fixed to the outer surface of the exhaust pipe, And the outer surface of the exhaust pipe are increased by a reinforcing material made of a metal mesh on the inner surface of the cylinder, and as a result, the spherical belt-like seal body is firmly fixed to the outer surface of the exhaust pipe.
[0020]
A spherical base defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface, and the partially convex spherical surface of the spherical base A manufacturing method of a spherical belt-shaped sealing body according to the first aspect of the present invention including a formed outer layer includes a heat-resistant sheet material made of expanded graphite and a heat-insulating sheet material or ceramic sheet having a plurality of holes in the thickness direction. Alternatively, after superposing a heat insulating sheet material made of paper and a reinforcing material made of wire mesh, winding the polymer in a spiral shape to form a cylindrical base material, and preparing another heat resistant sheet material, Forming an outer surface layer-forming member comprising another heat-resistant sheet material and another reinforcing material comprising a wire mesh covering the other heat-resistant sheet material, and forming the outer surface layer-forming member on the outer periphery of the cylindrical base material Winding a surface to form a preliminary cylindrical formed body, and The step of inserting a cylindrical body into the outer peripheral surface of the core of the mold, placing the core in the mold and compressing the preliminary cylindrical body in the mold in the axial direction of the core, The spherical belt-shaped substrate is configured such that a heat insulating sheet material and a reinforcing material made of a wire mesh are compressed and entangled with each other to have structural integrity, and a reinforcing material made of a compressed wire mesh and a wire mesh of the reinforcing material At least one layer extending in the circumferential direction consisting of a heat-resistant material made of expanded graphite filled with a mesh and compressed and mixed and integrated with this reinforcing material, and a heat-insulating sheet material intertwined with the reinforcing material and the heat-resistant material A heat-insulating layer, and the outer layer has a heat-resistant material made of expanded graphite and a reinforcing material made of a wire mesh mixed and integrated with the heat-resistant material. The outer surface of the Characterized in that the wood has a mixed integrated smooth surface.
[0021]
According to the manufacturing method of the first aspect, since the heat insulating sheet material has a plurality of holes in its thickness direction, the heat-resistant sheet material made of expanded graphite and the reinforcing material made of wire mesh are entangled with each other in the compression process. As a result of having a structural integrity and spreading in the circumferential direction in the spherical belt-shaped substrate to form a heat insulating layer, it is possible to obtain a strongly integrated spherical belt-shaped sealing body even if it has a heat insulating layer it can.
[0022]
A spherical base defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface, and the partially convex spherical surface of the spherical base A method for producing a spherical band-shaped sealing body according to the second aspect of the present invention including the formed outer layer includes a heat-resistant sheet material made of expanded graphite and a heat-insulating sheet material or ceramic sheet having a plurality of holes in the thickness direction. Alternatively, after superposing a heat insulating sheet material made of paper and a reinforcing material made of wire mesh, the polymer is wound in a spiral shape to form a cylindrical base material, and lubrication consisting of a lubricating sliding material on one surface An outer surface layer forming member comprising another heat-resistant sheet material provided with a coating layer, and comprising another heat-resistant sheet material and another reinforcing material made of a wire mesh covering the lubricating coating layer of the other heat-resistant sheet material Forming the outer surface layer forming member A step of forming a preliminary cylindrical molded body by winding on the outer peripheral surface of the shaped base material, inserting the preliminary cylindrical molded body into the core outer peripheral surface of the mold, placing the core in the mold, and in the mold In which the pre-cylindrical molded body is compression-molded in the core axial direction. Here, the spherical belt-like substrate is compressed by a heat insulating sheet material and a reinforcing material made of a wire mesh, and is entangled with each other so as to have structural integrity. A reinforcing material made of compressed wire mesh, a heat-resistant material made of expanded graphite, which is packed together with the reinforcing material and compressed by being mixed and integrated with the reinforcing material, and the reinforcing material And at least one heat-insulating layer that extends in the circumferential direction made of a heat-insulating sheet material intertwined with the heat-resistant material, and the outer layer is a mixture of a lubricating coating layer made of a lubricating sliding material and this lubricating coating layer. A reinforcing member made of a wire mesh Cage, partially convex spherical outer surface which is exposed to the outside in the outer layer, characterized in that said lubricating sliding material and the reinforcing material is in the mixed integrated smooth lubrication sliding surface.
[0023]
According to the manufacturing method of the second aspect, as in the manufacturing method of the first aspect, the heat insulating sheet material has a plurality of holes in its thickness direction, so that the heat-resistant sheet made of expanded graphite in the compression step As a result, the heat-insulating layer can be formed by spreading in the circumferential direction within the spherical belt-shaped substrate by intertwining with the reinforcing material composed of the material and the wire mesh and having structural integrity. A spherical ball-shaped seal body can be obtained.
[0024]
Moreover, according to the manufacturing method of the second aspect, since another heat-resistant sheet material has a lubricating coating layer made of a lubricating sliding material on one surface thereof, the lubricating sliding material spread by the compression process is used. An outer layer having a lubricating coating layer and a reinforcing material made of a wire mesh mixed and integrated with the lubricating coating layer can be formed. Thus, the extended lubricating sliding material and the reinforcing material are mixed and integrated. A partially convex spherical outer surface exposed to the outside in the outer layer can be formed as a smooth lubricating sliding surface.
[0025]
This lubricating sliding material is preferably made of at least one of ethylene tetrafluoride resin and boron nitride, as in the method for producing a spherical belt-shaped sealing body of the third aspect.
[0026]
According to a fourth aspect of the present invention, there is provided a method for manufacturing a spherical band-shaped sealing body. In the method for manufacturing a spherical band-shaped sealing body according to the first to third aspects, the heat insulating sheet material is made of a ceramic sheet or paper. Is preferably made of a heat insulating material selected from calcium silicate, aluminum oxide, and silicon carbide, as in the method of manufacturing the spherical band-shaped sealing body of the fifth aspect.
[0027]
Such a heat insulating sheet material forms a heat insulating layer that is intertwined with the reinforcing material and the heat-resistant material and spreads in the circumferential direction in the spherical base.
[0028]
According to a sixth aspect of the present invention, there is provided a method for producing a spherical band-shaped sealing body. In the method for producing a spherical band-shaped sealing body according to any one of the first to fifth aspects, the polymer is spirally wound with the heat-resistant sheet material inside. Winding to form a cylindrical base material.
[0029]
According to the manufacturing method of the sixth aspect, it is possible to manufacture a spherical band seal body in which the heat resistant material made of expanded graphite of the spherical band base is exposed on the inner surface of the cylinder.
[0030]
The manufacturing method of the spherical belt-shaped sealing body according to the seventh aspect of the present invention is the method of manufacturing the spherical belt-shaped sealing body according to any one of the first to fifth aspects, wherein the polymer is swirled with the reinforcing material made of a wire mesh inside. A cylindrical base material is formed by winding into a shape.
[0031]
According to the manufacturing method of the seventh aspect, it is possible to manufacture a spherical belt-shaped sealing body in which a reinforcing material made of a wire mesh of a spherical belt-shaped substrate is exposed on the inner surface of the cylinder.
[0032]
Hereinafter, the present invention and its embodiments will be described based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
The constituent material in the spherical belt-shaped sealing body of the present invention and the manufacturing method of the spherical belt-shaped sealing body will be described.
[0034]
<About heat-resistant sheet material>
A heat treatment (expansion) treatment is performed on the acid-treated graphite raw material at a high temperature, for example, 1000 ° C. to generate a decomposition gas, and the graphite layer is expanded by the gas pressure to form expanded graphite particles. A heat-resistant sheet material made of expanded graphite obtained by roll forming is used.
[0035]
<About reinforcing material>
Reinforcing materials include stainless steel wire such as austenitic SUS304 or SUS316 or ferritic SUS430 or iron wire (JIS-G-3532) or galvanized iron wire (JIS-G-3547), and copper as copper. -Nickel alloy (white copper), copper-nickel-zinc alloy (white and white), brass, weaving using one or more thin wires with a wire diameter of about 0.10 to 0.32 mm made of beryllium copper, A wire mesh having a mesh of about 3 to 6 mm formed by knitting is used.
[0036]
<About insulation>
As the heat insulating material, a material selected from calcium silicate, aluminum oxide and silicon carbide is preferably used, and as the heat insulating sheet material, a ceramic sheet comprising a heat insulating material selected from such calcium silicate, aluminum oxide and silicon carbide. Or paper is used. This heat insulating sheet material has a thickness of 0.5 to 1.0 mm and has a plurality of holes in the thickness direction.
[0037]
Next, a method for producing a spherical belt-shaped sealing body made of the above-described constituent materials will be described with reference to the drawings.
[0038]
<The manufacturing method of the spherical belt-shaped sealing body of a 1st aspect>
(First Step) A strip-shaped wire mesh 4 having a predetermined width D is produced by passing a cylindrical wire mesh 1 formed by knitting a thin metal wire into a cylindrical shape as shown in FIG. A reinforcing material 5 obtained by cutting 4 into a predetermined length L, or a reinforcing material 5 obtained by cutting a band-shaped wire mesh directly formed by weaving or knitting a thin metal wire into a predetermined width D and length L is prepared. To do.
[0039]
(Second Step) As shown in FIG. 3, the width d of the reinforcing material 5 has a width d of 1.1 × D to 2.1 × D, and 1 with respect to the length L of the reinforcing material 5. A heat-resistant sheet material 6 made of expanded graphite cut so as to have a length l of 30 × L to 2.70 × L is prepared.
[0040]
(Third Step) As shown in FIG. 4, the reinforcing member 5 has the same width D and length L, and has a plurality of holes 7 in the thickness direction and calcium silicate, aluminum oxide, silicon carbide. A heat insulating sheet material 8 made of a ceramic sheet or paper made of a heat insulating material selected from the above is prepared.
[0041]
(Fourth Step) In the spherical band-shaped sealing body 58 or 61 described later, the expanded graphite is entirely formed on the large-diameter end surface 54 which is an annular end surface in the axial direction of the partially convex spherical surface 53. As shown in FIG. 5, at least one of the reinforcing material 5 and the heat insulating sheet material 8 in the width direction of the annular end surface 54 on the large diameter side of the partially convex spherical surface 53 is provided so that the heat-resistant material to be exposed is exposed. The heat-resistant sheet material 6 protrudes in the width direction from the edge 9 by a protrusion amount δ1 of 0.1 × D to 0.8 × D at the maximum, and the protrusion amount δ1 in the width direction of the heat-resistant sheet material 6 from the edge 9 is The amount of protrusion δ2 from the other end edge 10 in the width direction of the reinforcing material 5 and the heat insulating sheet material 8 serving as the end surface 55 on the small diameter side of the partially convex spherical surface 53 is increased. From one edge 11 in the vertical direction up to 0.30 × L While the heat-resistant sheet material 6 protrudes in the length direction by 1.70 × L, the length of the other edge 12 in the length direction of the reinforcing material 5 and the heat-insulating sheet material 8 and the length of the heat-resistant sheet material 6 corresponding to the edge 12 The width direction and the length direction of the reinforcing material 5, the heat insulating sheet material 8, and the heat resistant sheet material 6 are matched by substantially matching the edge 13 in the length direction, and the reinforcing material 5 and the heat insulating sheet material 8 A polymer 14 in which the heat-resistant sheet material 6 is superposed on each other is produced.
[0042]
(Fifth Step) The polymer 14 is spirally wound with the heat-resistant sheet material 6 on the inside as shown in FIG. 6 and wound so that the heat-resistant sheet material 6 is increased once, and the inner periphery side and the outer periphery side are wound. A cylindrical base material 15 with the heat-resistant sheet material 6 exposed on both sides is formed. As the heat-resistant sheet material 6, the length of the reinforcing material 5 and the heat insulating sheet material 8 is such that the number of windings of the heat-resistant sheet material 6 in the cylindrical base material 15 is larger than the number of windings of the reinforcing material 5 and the heat insulating sheet material 8. L having a length l of 1.30 × L to 2.70 × L is prepared in advance. In the cylindrical base material 15, as shown in FIG. 7, the heat-resistant sheet material 6 protrudes from the one edge 9 of the reinforcing material 5 and the heat insulating sheet 8 by δ 1 in the width direction on one edge side in the width direction. Further, on the other end edge side in the width direction of the heat-resistant sheet material 6, only δ2 protrudes from the other end edge 10 of the reinforcing material 5 and the heat insulating sheet material 8 in the width direction.
[0043]
(Sixth Step) As shown in FIG. 8, which is the same as the heat-resistant sheet material 6, but has a width W smaller than the width D and a length Y enough to wind the cylindrical base material 15 once. A heat-resistant sheet material 6 is prepared separately. On the other hand, as described in the first step, after forming the cylindrical wire mesh 1 by knitting a thin metal wire, a reinforcing material 5 composed of a belt-like wire mesh 4 produced by passing the wire between the rollers 2 and 3 is prepared separately. Then, as shown in FIG. 9, the heat-resistant sheet material 6 is inserted into the belt-shaped wire mesh 4, and these are integrated through the rollers 16 and 17, as shown in FIG. An outer surface layer forming member 18 composed of a heat-resistant sheet material 6 and another reinforcing material 5 composed of a strip-shaped wire net 4 disposed so as to cover the other heat-resistant sheet material 6 is formed.
[0044]
(Seventh Step) The outer surface layer forming member 18 obtained in this way is wound around the outer peripheral surface of the cylindrical base material 15 to produce a preliminary cylindrical molded body 19 as shown in FIG.
[0045]
(Eighth step) By including a cylindrical wall surface 31, a partially concave spherical wall surface 32 continuous with the cylindrical wall surface 31 and a through hole 33 continuous with the partially concave spherical wall surface 32 on the inner surface, and inserting a stepped core 34 into the through hole 33. A mold 37 as shown in FIG. 12 having a hollow cylindrical part 35 and a spherical hollow part 36 connected to the hollow cylindrical part 35 formed therein is prepared, and preliminary cylindrical molding is performed on the stepped core 34 of the mold 37. Insert body 19.
[0046]
The preliminary cylindrical molded body 19 positioned in the hollow cylindrical portion 35 and the spherical belt-shaped hollow portion 36 of the mold 37 is 1 to 3 ton / cm in the core axial direction. ² 1 and has a through hole 51 in the center as shown in FIG. 1, and an annular surface on the large diameter side and a small diameter side of the cylindrical inner surface 52, the partially convex spherical surface 53, and the partially convex spherical surface 53. A spherical belt-shaped sealing body 58 is produced, which includes a spherical belt-shaped substrate 56 defined by the end surfaces 54 and 55 and an outer layer 57 integrally formed on the partially convex spherical surface 53 of the spherical belt-shaped substrate 56.
[0047]
By this compression molding, the ball-shaped base 56 is configured such that the heat-resistant sheet material 6 and the reinforcing material 5 made of a wire mesh are compressed and entangled with each other to have structural integrity, and the reinforcing material made of a compressed wire mesh. 5, a heat-resistant material made of expanded graphite, which is filled with the mesh of the reinforcing material 5 and the heat-resistant sheet material 6 is compressed and mixed and integrated with the reinforcing material 5, and the reinforcing material 5 and the heat-resistant material And a heat insulating layer 59 made of a heat insulating material of the heat insulating sheet material 8 and spread in the circumferential direction, the outer layer 57 is a heat resistant material made of expanded graphite in which the heat resistant sheet material 6 is compressed, The outer surface 60 of the partially convex spherical surface exposed to the outside in the outer layer 57 is formed in a smooth surface and defines the through-hole 51. On the inner surface 52 of the cylinder, Heat-resistant material made of expanded graphite which bets member 6 is compressed is formed by exposure.
[0048]
In the spherical belt-shaped sealing body 58 shown in FIG. 1 manufactured by the above-described method, the heat-resistant sheet material 6 is intertwined with the reinforcing material 5 made of a wire mesh that forms the internal structure, and has a partially convex spherical outer surface. Reference numeral 60 denotes a partially convex spherical surface that is formed on a smooth surface in which the outer surface layer of heat-resistant material made of expanded graphite formed by the outer surface layer forming member 18 and the reinforcing material 5 made of wire mesh are mixed and integrated. The large-diameter-side annular end surface 54 and the small-diameter-side end surface 55 of the heat-resistant sheet material 6 protruding from the reinforcing material 5 in the width direction are the large-diameter-side annular end surface 54 and small-diameter side of the partially convex spherical surface 53. It is formed with a heat-resistant material made of expanded graphite by being bent and spread on the end face 55 of the glass.
[0049]
In the third step of the manufacturing method described above, by appropriately adjusting the length L of the heat insulating sheet material 8, the number of the heat insulating layers 59 made of the heat insulating sheet material 8 in the ball-shaped base 56 can be adjusted as appropriate. . In the second step, the heat-resistant sheet material 6 cut to have substantially the same length l with respect to the length L of the reinforcing material 5 and the heat insulating sheet material 8 is prepared, and these are described above. In the same manner as in the fourth step, a polymer 14 is obtained by superimposing the polymer 14 with the reinforcing material 5 on the inside to form a cylindrical base material 15 in the same manner as in the fifth step described above. Through the eighth step from the step, it is possible to produce a spherical belt-shaped sealing body 58 in which the reinforcing material 5 made of a wire mesh of the spherical belt-shaped substrate 56 is exposed on the cylindrical inner surface 52 that defines the through hole 51.
[0050]
<The manufacturing method of the spherical belt-shaped sealing body of a 2nd aspect>
The first process to the fifth process are the same as the first process to the fifth process.
[0051]
(Sixth Step) The heat resistant sheet material 6 is the same as the heat resistant sheet material 6 except that the heat resistant sheet material 6 has a width W smaller than the width D and a length Y enough to wind the cylindrical base material 15 once. Prepare and coat one surface of the heat-resistant sheet material 6 with an aqueous dispersion of a lubricating sliding material composed of at least one of ethylene tetrafluoride resin and boron nitride by means of brushing, roller coating, spraying or the like. Then, this is dried to form a lubricating coating layer 20 made of a lubricating sliding material as shown in FIG.
[0052]
The reinforcing material 5 made of the strip-shaped wire mesh 4 described in the sixth step is separately prepared, and as shown in FIG. 14, a lubricating coating layer 20 made of a lubricating sliding material is provided on one surface in the belt-shaped wire mesh 4. As shown in FIG. 15, the heat-resistant sheet material 6 is inserted and integrated between the rollers 21 and 22, so that another heat-resistant sheet material 6 and the lubricating coating layer 20 of the other heat-resistant sheet material 6 are obtained. An outer surface layer forming member 23 composed of another reinforcing material 5 composed of a strip-shaped wire mesh 4 disposed so as to cover the surface is formed.
[0053]
(Seventh Step) The outer surface layer forming member 23 obtained in this way is wound around the outer peripheral surface of the cylindrical base material 15 with the lubricating coating layer 20 on the outside, and a preliminary cylindrical molded body 24 as shown in FIG. Make it. The preliminary cylindrical molded body 24 is compression-molded by the same method as in the eighth step, and has a through hole 51 at the center as shown in FIGS. 17 and 18, and a cylindrical inner surface 52 and a partially convex spherical surface 53. And a spherical belt-like substrate 56 defined by the large-diameter and small-diameter annular end surfaces 54 and 55 of the partially convex spherical surface 53, and the partially convex spherical surface 53 of the spherical belt-like substrate 56. A spherical belt-like seal body 61 having an outer layer 57 is produced.
[0054]
By this compression molding, the ball-shaped base 56 is configured such that the heat-resistant sheet material 6 and the reinforcing material 5 made of a wire mesh are compressed and entangled with each other to have structural integrity, and the reinforcing material made of a compressed wire mesh. 5, a heat-resistant material made of expanded graphite, which is filled with the mesh of the reinforcing material 5 and the heat-resistant sheet material 6 is compressed and mixed and integrated with the reinforcing material 5, and the reinforcing material 5 and the heat-resistant material And a heat insulating layer 59 made of a heat insulating material of the heat insulating sheet material 8, and the outer layer 57 is made of a lubricating coating layer 20 and a wire mesh integrated with the coating layer 20. The reinforcing material 5 is compressed and entangled with each other to have structural integrity. The lubricating coating layer 20 made of a lubricating sliding material and the reinforcing material made of a metal mesh mixed and integrated with the lubricating coating layer 20 5 and The partially convex spherical outer surface 60 exposed to the outside in the layer 57 becomes a smooth lubricating sliding surface in which the lubricating sliding material and the reinforcing material 5 of the lubricating coating layer 20 are mixed and integrated, and the cylindrical inner surface defining the through hole 51 52, the heat-resistant sheet material 6 is formed by exposing the heat-resistant material made of expanded graphite, and the large-diameter-side annular end surface 54 and the small-diameter-side end surface 55 of the partially convex spherical surface 53 are formed of a reinforcing material. The heat-resistant sheet material 6 that protrudes in the width direction from 5 is bent at the annular end surface 54 on the large-diameter side and the end surface 55 on the small-diameter side of the partially convex spherical surface 53, and is expanded so that it is made of expanded graphite. It is formed with it.
[0055]
Also in the ball-shaped seal body 61 of this second aspect, in the third step of the manufacturing method described above, the length L of the heat-insulating sheet material 8 is appropriately adjusted, so that the heat-insulating sheet material 8 is inserted into the ball-shaped substrate 56. The number of layers of the heat insulating layer 59 can be adjusted as appropriate. In the second step, the heat-resistant sheet material 6 cut to have substantially the same length l with respect to the length L of the reinforcing material 5 and the heat insulating sheet material 8 is prepared, and these are described above. In the same manner as in the fourth step, a polymer 14 is obtained by superimposing the polymer 14 with the reinforcing material 5 on the inside to form a cylindrical base material 15 in the same manner as in the fifth step described above. Through the eighth step from the step, it is possible to produce a spherical belt-shaped sealing body 61 in which the reinforcing material 5 made of a wire mesh of the spherical belt-shaped substrate 56 is exposed on the cylindrical inner surface 52 in the through hole 51.
[0056]
The spherical belt-like seal body 58 or 61 is used by being incorporated in, for example, an exhaust pipe spherical joint shown in FIG. That is, a flange 200 is erected on the outer peripheral surface of the upstream side exhaust pipe 100 connected to the engine side, leaving the pipe end portion 101, and a ball-shaped seal body 58 or 61 is provided on the pipe end portion 101. The cylindrical inner surface 52 that defines the through-hole 51 is fitted, and a spherical seal 58 or 61 is abutted against the flange 200 and seated on the large-diameter end surface 54. A diameter-enlarging portion 301 having a concave spherical portion 302 at the end and a flange portion 303 at the periphery of the opening of the concave spherical portion 302 is formed integrally with the upstream exhaust pipe 100 and connected to the muffler side. The downstream exhaust pipe 300 is disposed so that the concave spherical surface portion 302 is in sliding contact with the partially convex spherical outer surface 60 of the spherical belt-shaped seal body 58 or 61.
[0057]
In the exhaust pipe spherical joint shown in FIG. 19, a pair of bolts 400 having one end fixed to the flange 200 and the other end inserted through the flange portion 303 of the enlarged diameter portion 301 and the enormous head and flange portion of the bolt 400. A spring force is always applied to the downstream side exhaust pipe 300 in the direction of the upstream side exhaust pipe 100 by the pair of coil springs 500 arranged between 303. Further, the exhaust pipe spherical joint is configured to prevent the relative angular displacement generated in the upper and downstream exhaust pipes 100 and 300 from being partially convex spherical outer surface 60 of the spherical belt-shaped seal body 58 or 61 and the end of the downstream exhaust pipe 300. This is configured to allow this by sliding contact with the concave spherical surface portion 302 of the enlarged diameter portion 301 formed in the portion.
[0058]
The ball-shaped seal body 58 or 61 incorporated in the exhaust pipe spherical joint is an upstream exhaust gas in which the ball-shaped seal body 58 or 61 is fitted and seated by a heat insulating layer 59 formed in the ball-shaped base body 56. Since the heat transfer of the exhaust gas passing through the tube 100 is suppressed as much as possible, the influence of the exhaust gas heat on the partially convex spherical outer surface 60 exposed to the atmosphere of the spherical seal 58 or 61 in particular. As a result, high temperature oxidation on the partially convex spherical outer surface 60 is suppressed as much as possible. As a result, oxidation consumption of the ball-shaped seal body 58 or 61, and hence deterioration in sealing performance due to oxidation consumption, and the like do not occur.
[0059]
Further, in the ball-shaped seal body 58, the outer layer 57 has a heat-resistant material made of expanded graphite and a reinforcing material 5 made of a wire mesh 4 mixed and integrated with the heat-resistant material. The exposed partially convex spherical outer surface 60 is a smooth surface in which the heat-resistant material and the reinforcing material 5 are mixed and integrated. As a result, the heat transfer of the exhaust gas to the outer layer 57 is suppressed, and In combination with the suppression of oxidation consumption at the outer layer 57 site, in the sliding contact with the counterpart material, formation of an excessive coating of the heat-resistant material that forms the outer layer 57 on the counterpart material surface is suppressed, and the counterpart material Since smooth sliding contact with the surface is performed, durability such as sealing performance of the ball-shaped seal body 58 can be enhanced. In the ball-shaped seal body 61, the outer layer 57 has a partially convex spherical shape exposed to the outside. The outer surface 60 is a smooth surface and is lubricated. . Doing so may material and the reinforcing member 5 is in the mixed integrated smooth lubrication sliding surfaces, smooth sliding is effected in sliding contact with the mating member.
[0060]
【The invention's effect】
According to the present invention, the heat transfer of the exhaust gas to the outer surface that is in sliding contact with the counterpart material is suppressed as much as possible, the oxidation consumption of the outer surface due to the heat is suppressed, durability can be improved, and the exhaust gas temperature can be reduced. It is possible to provide a ball-shaped seal body used for a spherical joint of an automobile exhaust pipe that can be prevented and a method for manufacturing the same.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a preferred example of a ball-shaped seal body of the present invention.
FIG. 2 is an explanatory view of a method for forming a reinforcing material in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 3 is a perspective view of a heat-resistant sheet material in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 4 is a perspective view of a heat insulating sheet material in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 5 is a perspective view of a polymer in the manufacturing process of the spherical belt-shaped sealing body of the present invention.
FIG. 6 is a plan view of a cylindrical base material in the manufacturing process of the ball-shaped seal body of the present invention.
7 is a longitudinal sectional view of the cylindrical base material shown in FIG.
FIG. 8 is a perspective view of a heat-resistant sheet material in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 9 is an explanatory view of a method for forming an outer surface layer forming member in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 10 is an explanatory diagram of a method for forming an outer surface layer forming member in the manufacturing process of the spherical belt-shaped sealing body of the present invention.
FIG. 11 is a plan view of a pre-cylindrical molded body in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 12 is a longitudinal sectional view showing a state in which a pre-cylindrical molded body is inserted into a mold in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 13 is a longitudinal cross-sectional view of a heat-resistant sheet material on which a lubricating coating layer is formed in the manufacturing process of the spherical belt-shaped sealing body of the present invention.
FIG. 14 is an explanatory diagram of a method for forming an outer surface layer forming member in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 15 is an explanatory diagram of a method for forming an outer surface layer forming member in the manufacturing process of the ball-shaped seal body of the present invention.
FIG. 16 is a plan view of a pre-cylindrical molded body in the manufacturing process of the spherical belt-shaped sealing body of the present invention.
FIG. 17 is a longitudinal sectional view of another preferred example of the ball-shaped seal body of the present invention.
18 is a partially enlarged sectional view of the partially convex spherical outer surface of the example shown in FIG. 17;
19 is a longitudinal sectional view of an exhaust pipe spherical joint incorporating the ball-shaped seal body of the example of FIGS. 1 and 17. FIG.
[Explanation of symbols]
4 Wire mesh
5 Reinforcing material
52 Cylindrical inner surface
53 Partially convex spherical surface
54, 55 end face
56 Spherical belt-shaped substrate
57 outer layer
58 Sphere-shaped seal
59 Thermal insulation layer
60 exterior

Claims

A spherical base defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface, and the partially convex spherical surface of the spherical base A spherical band-shaped sealing body having a formed outer layer, and the spherical band-shaped substrate is filled with a reinforcing material made of a compressed wire mesh and a mesh of the wire mesh of the reinforcing material, and mixed with the reinforcing material. Heat-resistant material made of expanded graphite that has been compressed, and the reinforcing material and the heat-resistant material are intertwined with each other and spread in the circumferential direction and have a plurality of holes in the thickness direction, or a plurality of ceramic sheets in the thickness direction And at least one heat insulating layer made of paper heat insulating sheet material, and the outer layer is a heat resistant material made of expanded graphite and a reinforcing material made of a wire mesh mixed and integrated with this heat resistant material. And is exposed to the outside in the outer layer. The outer surface of the partially convex spherical shape is a smooth surface in which the heat-resistant material and the reinforcing material are mixed and integrated, and the outer layer is mixed and integrated with the lubricating coating layer made of a lubricating sliding material. The outer surface of the partially convex spherical surface exposed to the outside in the outer layer is a smooth lubricating sliding surface in which the lubricating sliding material and the reinforcing material are mixed and integrated. A spherical belt-like seal body characterized by being.

2. The spherical belt-shaped seal body according to claim 1, wherein the lubricating sliding material is made of at least one of ethylene tetrafluoride resin and boron nitride.

The spherical sheet-like sealing body according to claim 1 or 2, wherein the ceramic sheet or paper is made of a heat insulating material selected from calcium silicate, aluminum oxide, and silicon carbide.

The ball-shaped seal body according to any one of claims 1 to 3, wherein a heat-resistant material made of expanded graphite of the ball-shaped substrate is exposed on the inner surface of the cylinder.

The spherical band-shaped sealing body according to any one of claims 1 to 3, wherein a reinforcing material made of a metal net of a spherical band-shaped substrate is exposed on an inner surface of the cylinder.

A spherical base defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface, and the partially convex spherical surface of the spherical base A method for producing a spherical belt-shaped sealing body having a formed outer layer, comprising a heat-resistant sheet material made of expanded graphite and a heat-insulating sheet material having a plurality of holes in the thickness direction, or a heat-insulating sheet made of a ceramic sheet or paper And a step of forming a cylindrical base material by winding this polymer in a spiral shape after superposing a reinforcing material made of a material and a wire mesh, and preparing another heat-resistant sheet material, A step of forming an outer surface layer forming member made of another reinforcing material made of a wire mesh covering the other heat resistant sheet material, and winding the outer surface layer forming member around the outer peripheral surface of the cylindrical base material Step of forming cylindrical molded body and preliminary cylindrical molded body A step of inserting the core into the outer peripheral surface of the mold, placing the core in the mold, and compressing and molding the preliminary cylindrical molded body in the core axial direction in the mold. And the reinforcement made of wire mesh are compressed and entangled with each other to have structural integrity, and the reinforcement made of compressed wire mesh and the mesh of the reinforcement mesh are filled, and this reinforcement A heat-resistant material composed of expanded graphite mixed and integrated with the material, and at least one heat-insulating layer extending in the circumferential direction composed of a heat-insulating sheet material intertwined with the reinforcing material and the heat-resistant material, The outer layer has a heat-resistant material made of expanded graphite and a reinforcing material made of a wire mesh mixed and integrated with the heat-resistant material, and the outer surface of the partially convex spherical surface exposed to the outside in the outer layer is the heat-resistant material. The reinforcement material is mixed and integrated. Method of manufacturing a spherical annular seal member, characterized in that has a smooth surface.

A spherical base defined by a cylindrical inner surface, a partially convex spherical surface, and annular end surfaces on the large diameter side and the small diameter side of the partial convex spherical surface, and the partially convex spherical surface of the spherical base A method for producing a spherical belt-shaped sealing body having a formed outer layer, comprising a heat-resistant sheet material made of expanded graphite and a heat-insulating sheet material having a plurality of holes in the thickness direction, or a heat-insulating sheet made of a ceramic sheet or paper After superimposing a material and a reinforcing material made of a wire mesh, the polymer is spirally wound to form a cylindrical base material, and another surface is provided with a lubricating coating layer made of a lubricating sliding material on one surface. Preparing a heat-resistant sheet material, and forming an outer surface layer forming member composed of another heat-resistant sheet material and another reinforcing material composed of a wire mesh covering the lubricating coating layer of the other heat-resistant sheet material, The outer surface layer forming member is an outer periphery of the cylindrical base material. And forming a preliminary cylindrical molded body, inserting the preliminary cylindrical molded body into the outer peripheral surface of the core of the mold, placing the core in the mold, and forming the preliminary cylindrical molded body in the mold. A compression-molded metal mesh comprising a step of compression molding in the core axial direction, and a spherical band-shaped substrate is formed by compressing a heat insulating sheet material and a reinforcing material made of a metal mesh so that they are intertwined with each other and have structural integrity. A heat-resistant material made of expanded graphite, which is filled with a mesh of the reinforcing material and which is mixed and integrated with the reinforcing material, and is intertwined with the reinforcing material and the heat-resistant material. At least one heat insulating layer extending in the circumferential direction made of a sheet material, and the outer layer includes a lubricating coating layer made of a lubricating sliding material and a reinforcing material made of a metal mesh mixed and integrated with the lubricating coating layer. Has and outside in the outer layer Exposed partially convex spherical outer surface, method of manufacturing a spherical annular seal member, characterized in that said lubricating sliding material and the reinforcing material is in the mixed integrated smooth lubrication sliding surface.

The manufacturing method of the spherical belt-shaped sealing body according to claim 7, wherein the lubricating sliding material is made of at least one of ethylene tetrafluoride resin and boron nitride.

The method for manufacturing a spherical belt-shaped sealing body according to any one of claims 6 to 8, wherein the heat insulating sheet material is made of a ceramic sheet or paper.

10. The method for producing a spherical belt-shaped sealing body according to claim 6, wherein the ceramic sheet or paper is made of a heat insulating material selected from calcium silicate, aluminum oxide, and silicon carbide.

The manufacturing method of the spherical belt-shaped sealing body as described in any one of Claims 6-10 which forms a cylindrical preform | base_material by winding a polymer in a spiral shape with a heat-resistant sheet material inside.

The manufacturing method of the spherical belt-shaped sealing body as described in any one of Claim 6 to 10 which forms a cylindrical preform | base_material by winding a polymer in the spiral shape by making the reinforcement material which consists of metal meshes inside.