JP3954892B2 - Flexible joint structure in exhaust system - Google Patents

Flexible joint structure in exhaust system Download PDF

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Publication number
JP3954892B2
JP3954892B2 JP2002121243A JP2002121243A JP3954892B2 JP 3954892 B2 JP3954892 B2 JP 3954892B2 JP 2002121243 A JP2002121243 A JP 2002121243A JP 2002121243 A JP2002121243 A JP 2002121243A JP 3954892 B2 JP3954892 B2 JP 3954892B2
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Prior art keywords
flexible tube
outer blade
flexible
exhaust pipe
outermost
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JP2003314273A (en
Inventor
美彦 江口
正彦 樋口
巧 高賀茂
秀徳 鈴木
徹 服部
順 深澤
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Honda Motor Co Ltd
Sankei Giken Kogyo Co Ltd
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Honda Motor Co Ltd
Sankei Giken Kogyo Co Ltd
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Priority to JP2002121243A priority Critical patent/JP3954892B2/en
Priority to CNB031222234A priority patent/CN1236199C/en
Publication of JP2003314273A publication Critical patent/JP2003314273A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
    • F16L27/1004—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations introduced in exhaust pipes for hot gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/10—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations
    • F16L27/107—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve
    • F16L27/11—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve the sleeve having the form of a bellows with multiple corrugations
    • F16L27/111—Adjustable joints, Joints allowing movement comprising a flexible connection only, e.g. for damping vibrations the ends of the pipe being interconnected by a flexible sleeve the sleeve having the form of a bellows with multiple corrugations the bellows being reinforced
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Joints Allowing Movement (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、車両、主として自動車の車体前部に配置された走行用エンジンから車体の後方へ伸びる排気系の途中に接続される、排気系におけるフレキシブルジョイント構造に関するものである。
【０００２】
【従来の技術】
一般に、自動車などの車両において、走行用のエンジンを、車体の前部に配置したものでは、該エンジンの排気系は、車体の前部からその後方へ向けて延長されていて、その全長が長いため、自動車の走行時に発生する走行振動やエンジンの運転振動が排気系に均等に伝わらずに、排気系を構成する排気管の一部に局部的に、曲げ、捩り、剪断などの応力が加わり、これがその排気管に亀裂などを発生させる原因となっていた。
【０００３】
そこで、従来では、図５に示すように、このような亀裂の発生を防止するために、排気管の途中に断面コルゲート状のフレキシブルチューブを接続し、このフレキシブルチューブにより前記応力を吸収するようにし、またこのフレキシブルチューブが、自動車の走行時に、タイヤなどにより撥ね飛ばされた飛石などが当たって損傷するのを防止するためフレキシブルチューブの外周を筒状のアウタブレードにより覆うようにし、さらに、フレキシブルチューブの外端部外周面と、アウタブレードの外端部内周面との強く擦れ合う部分にインナプレートを介在して、それらの摩耗、亀裂などの発生を防止するようにしている。
【０００４】
【発明が解決しようとする課題】
ところが、前記従来のものでは、図５に示すように、フレキシブルチューブとアウタブレードとの擦れ合いを防止するための、インナプレートはフレキシブルチューブの外端の外周面と、アウタブレードの外端の内周面との間に配置されていて、フレキシブルチューブの最外端の凸条部を覆うように、その凸条部側に向けて湾曲しているので、少なくとも最外端の凸条部を、残りの凸条部よりも低く形成しなければならなかった。
【０００５】
ところが、一般に断面コルゲート状のフレキシブルチューブでは、凸条部の高さを低くすると曲げおよび伸び方向の両方のバネ定数が高くなり、特に凸条部の高さを低くする個所が、両端に近いほど曲げ方向のバネ定数がより高くなる傾向となるので、前述のように、フレキシブルチューブの最外端の凸条部を、残りの凸条部よりも低く設定すれば、フレキシブルチューブ全体の曲げおよび伸び方向のバネ定数が高くなり、その結果、排気系の揺動による、曲げ、伸びなどの応力を吸収するというフレキシブルジョイント本来の機能が損なわれるという問題がある。そして、かかる問題を解決するには、凸条部の数、凸条部の高さの増加、フレキシブルチューブの板厚の薄肉化などの対策が必要となり、フレキシブルジョイントのコストアップ、大型化を招くという別の問題がある。
【０００６】
さらに、従来のフレキシブルジョイントでは、インナプレートの先端部のエッジがアウタブレードの内周面に近接しているため、このエッジがアウタブレードの内周面に干渉して、該アウタブレードを損傷する虞れがあるという問題もある。
【０００７】
本発明はかかる実情に鑑みてなされたものであり、前記フレキシブルチューブおよびインナプレートに改良を加えて、前記問題をすべて解決した、新規な排気系におけるフレキシブルジョイント構造を提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
前記目的を達成するため、本請求項１記載の発明は、上流側排気管と、下流側排気管とを接続する排気系におけるフレキシブルジョイント構造であって、
接続端部を残して多数の同じ高さの、凸条部と凹条部とを交互に有して断面コルゲート状に形成されるフレキシブルチューブと、このフレキシブルチューブの外周を覆うアウタブレードと、前記フレキシブルチューブの最外端の凸条部と、前記アウタブレードの端壁部間に設けられるインナプレートとを備え、前記インナプレートは、前記アウタブレードとフレキシブルチューブ間に挟持される接続端部と、この接続端部の内側からフレキシブルチューブの最外端の凸条部の外側面に密着するように径方向に伸びるプレート部と、そのプレート部の径方向外側より前記最外端の凸条部から離れる方向にループ状に巻かれるループ状部とを有し、そのループ状部の高さが、前記フレキシブルチューブの凸条部の高さよりも高く、アウタブレードとフレキシブルチューブの間に環状の間隙を形成してなることを特徴としており、かかる特徴によれば、多数の凸条部と凹条部を有するフレキシブルチューブは、その全長にわたり同径に形成されてフレキシブルチューブの曲げ方向および伸び方向のバネ定数が高くなることがなく、その上、フレキシブルチューブの多数の凸条部と凹条部は、アウタブレードと接触することがないので、上流側および下流側排気管にかかる捩り、曲げなどの応力の吸収緩和能率およびその振動吸収能率を高めることができ、フレキシブルチューブ自体の製作も容易になる。また、フレキシブルチューブは、最外端の凸条部を、残りの凸条部と同じ高さに形成したにも拘らず、インナプレートにより最外端の凸条部とアウタブレードとの直接接触を回避したため、それらの接触部の摩耗を防止することができ、さらにインナプレートのループ状部は、最外端の凸条部に対して離れる方向に湾曲していることにより、該インナプレートのエッジ部分が、アウタブレードの内面と干渉することがなく、アウタブレードを損傷させることがない。
【０００９】
【発明の実施の形態】
以下、本発明の実施形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１０】
まず、図１〜３を参照して本発明の実施例について説明する。
【００１１】
この実施例は、本発明排気系におけるフレキシブルジョイント構造を、自動車用エンジンに実施した場合であり、図１は、本発明フレキシブルジョイント構造を自動車用エンジンの実施した場合の全体側面図、図２は、図１の２−２線に沿うフレキシブルジョイントの縦断側面図、図３は、図２のに仮想線囲い部分の拡大図である。
【００１２】
図１において、自動車の車体Ｂの前部には、その走行用エンジンＥが横置き（そのクランク軸Ｓｃが、自動車の前後方向と直交する方向）に搭載されている。エンジンＥの頭部前面に開口される吸気ポートには、吸気系Ｉｎが接続され、またその後面に開口される排気ポートには、排気系Ｅｘが接続される。この排気系Ｅｘは、前記排気ポートに一体に接続されるエキゾーストマニホールドＭｅと、排気管Ｐｅとを備えている。前記排気管Ｐｅは、自動車の床下を、前後方向に長く伸びていて上流側排気管１と、下流側排気管２とを備えており、エキゾーストマニホールドＭｅと上流側排気管１との間に球面ジョイントＪｂが介在され、また、上流側排気管１と下流側排気管２との間に、本発明にかかるフレキシブルジョイントＪｆが介在され、さらに下流側排気管の途中には、触媒コンバータＣａが介在されている。触媒コンバータＣａの下流側は、図示しない消音器を介して大気に開口される。球面ジョイントＪｂのケーシング部分は、ステー３を介して前記エンジンＥの本体部分に支持され、また下流側排気管２と触媒コンバータＣａとの接続部は他のステー４を介して車体Ｂのクロスメンバーに弾性支持されている。
【００１３】
図２に示すように、円筒状に形成される上流側排気管１の下流端と、下流側排気管２の上流端間には、本発明にかかるフレキシブルジョイントＪｆの前後両端が溶接接続される。上流側排気管１の下流側と、下流側排気管２の上流側はいずれも端部にいくにつれて段階的に小径に形成されており、それらの最小径の、下流端と上流端間は、可撓性のインナーパイプ５により気密に連通接続されており、上流側排気管２を流れる排ガスは、このインナーパイプ５を通って下流側排気管２へと流れる。
【００１４】
なお、前記可撓性のインナーパイプ５は帯状のパイプ素材５ａを螺旋状に巻曲してカシメ止めし、その外周をパイプ材５ｂにより被覆して構成されるが、このインナーパイプ５は従来公知のものであるので、その詳細な説明を省略する。
【００１５】
つぎに、図２，３を参照して、本発明にかかるフレキシブルジョイントＪｆの構造を詳細に説明するに、このフレキシブルジョイントＪｆは、フレキシブルチューブ７と、その外周を覆うアウタブレード８と、フレキシブルチューブ７の両端部外周面と、アウタブレード８の両端部内周面間に設けられる前、後のインナプレート９，９と、アウタブレード８の前後両端部外周を覆う前、後のエンドプレート１０，１０とより構成され、これらは何れもステンレス鋼板により構成される。
【００１６】
前記フレキシブルチューブ７は、その大部分を構成していて多数の凸条部Ｐ…と凹条部Ｄ…とを交互に連続した縦断面コルゲート状をなして全長にわたり同径に形成される筒状部７ａと、この筒状部７ａの最外端の凸条部Ｐｏの基部から軸方向に延びる前後の円筒状の接続端部（取付端部）７ｂ，７ｂとより形成されていて、充分な可撓性を保有しており、各凸条部Ｐおよび各凹条部Ｄの断面形状は、図３に明瞭に示すように、基端部から先端部にいくにつれて漸次末広状に拡がり、それらの先端部は、それらの基部よりも幅広に形成されている。そして左右最外端の凸条部Ｐｏ，Ｐｏの基部は、フレキシブルチューブ７の両端接続部（取付部）７ｂ，７ｂに一体につながっている。
【００１７】
一方、前記アウタブレード８は、前記フレキシブルチューブ７のコルゲート状筒状部７ａを覆う直状の円筒部８ａと、該円筒部８ａの前、後両端より径方向内方に屈曲される端壁部８ｂ，８ｂと、該端壁部８ｂ，８ｂの内側から軸方向に延びる小径な円筒状の両端の接続端部（取付部）８ｃ，８ｃとより構成されている。 さらに、前記インナプレート９は、前記アウタブレード８とフレキシブルチューブ７の接続端部８ｃ，７ｂ間に挟持される接続端部９ｂと、この接続端部９ｂの軸方向の内側からフレキシブルチューブ７の最外端の凸条部Ｐｏの外側面に密着状態で対面するように径方向に外側に延びるプレート部９ａと、そのプレート部９ａの径方向外端から前記最外端の凸条部Ｐｏから離れる方向にループ状に巻かれるループ状部９ｃとを有し、そのループ状部９ｃは、フレキシブルチューブ７の凸条部Ｐ，Ｐｏよりも高く、すなわち径方向に大きく形成されており、これにより、フレキシブルチューブ７のコルゲート状筒状部７ａを覆うアウタブレード８の直状の円筒部８ａ内周面と、フレキシブルチューブ７のコルゲート状筒状部７ａの外周面間には、環状の間隙ｓが形成され、フレキシブルジョイントＪｆが撓曲された際にもそれらが接触することがないようにしている。
【００１８】
また、アウタブレード８の接続端部８ｃおよび端壁部８ｂを含む前後の外端部は、前記エンドプレート１０により被覆されている。
【００１９】
図３に明瞭に示すように、フレキシブルチューブ７、インナプレート９およびアウタブレード８の、接続端部７ｂ，９ｂおよび８ｃは、順次に積層され、さらに、アウタブレード８の接続端部８ｃの外面にエンドプレート１０の接続端部が積層され、それらの両端縁は、上流側排気管１の下流端部および下流側排気管２の上流側端部外周に溶接結合される。
【００２０】
つぎに、この実施例の作用について説明する。
【００２１】
いま、エンジンＥの運転により発生する排ガスはエキゾーストマニホールドＭｅ、球面ジョイントＪｂ、上流側排気管１、フレキシブルジョイントＪｆ、下流側排気管２、触媒コンバータＣａ、および図示しない消音器を通り、その間にＨＣ、ＣＯなどの有害成分が浄化され、排気音が消音されて大気に放出される。
【００２２】
ところで前記排気系Ｅｘは、自動車の床下に配設されて、その全体の長さが長いため、自動車の走行時に発生する振動やエンジンＥの運転振動が排気系全体に均等に伝わらずに、上流側および下流側排気管１，２に捩り方向や曲げ方向の応力が発生するが、この応力を、前記フレキシブルジョイントＪｆにより吸収緩和することができる。特にこの発明に従うこの実施例では、フレキシブルチューブ７の多数の凸条部Ｐ…と凹条部Ｄ…を有する筒状部７ａは、その全長にわたり同径に形成されて、具体的には、最外端の凸条部Ｐｏが残りの凸条部Ｐよりも低くなる（前記従来のもの）ことがないので、フレキシブルチューブ７の曲げ方向および伸び方向のバネ定数が高くなることがなく、その上、フレキシブルチューブ７の筒状部７ａは、アウタブレード８と接触することがないので、上流側および下流側排気管１，２にかかる捩り、曲げなどの応力の吸収緩和能率およびその振動吸収能率を高めることができ、フレキシブルチューブ７自体の製作も容易になる。また、フレキシブルチューブ７は、最外端の凸条部Ｐｏを、残りの凸条部Ｐを同じ高さに形成したにも拘らず、インナプレート９により最外端の凸条部Ｐｏとアウタブレード８との直接接触を回避したため、それらの接触部の摩耗を防止することができ、さらにインナプレート９のループ状部９ｃは、最外端の凸条部Ｐｏに対して離れる方向に湾曲していることにより、該インナプレート９のエッジ部分が、アウタブレード８の内面と干渉することがなく、アウタブレード８を損傷させることがない。
【００２３】
つぎに、図４を参照して参考例について説明する。
【００２４】
図４は、フレキシブルジョイントの一部の断面図であり、図中前記実施例と同じ要素には、同じ符号が付される。
【００２５】
この参考例は、前記実施例のものにおいて、フレキシブルチューブ７の最外端の凸条部Ｐｏの外側面と、インナプレート９の径方向に延びるプレート状部９ａとの間に、環状の間隙ｄを形成した場合であり、その他の構成は前記実施例のものと同じである。
【００２６】
しかして、この参考例のものでは、前記間隙ｄの存在により、フレキシブルチューブ７の筒状部７ａの最外端の凸条部Ｐｏが、インナプレート９側にも変移することが可能であり、これにより、フレキシブルチューブ７のバネ定数の一層の低減化を図ることができ、その振動吸収能率をより高めることができる。
【００２７】
以上、本発明の実施例について説明したが、本発明はその実施例に限定されることなく、本発明の範囲内で種々の実施例が可能である。
【００２８】
【発明の効果】
以上のように、本請求項１記載の発明によれば、多数の凸条部と凹条部を有するフレキシブルチューブは、その全長にわたり同径に形成されるので、フレキシブルチューブの曲げ方向および伸び方向のバネ定数が高くなることがなく、その上、フレキシブルチューブの凸条部と凹条部は、アウタブレードと接触することがないので、上流側および下流側排気管にかかる捩り、曲げなどの応力の吸収緩和能率およびその振動吸収能率を高めることができ、フレキシブルチューブ自体の製作も容易になる。
【００２９】
また、アウタブレードとフレキシブルチューブ間に挟持される接続端部と、この接続端部の内側からフレキシブルチューブの最外端の凸条部の外側面に密着するように径方向に伸びるプレート部と、そのプレート部の径方向外側より前記最外端の凸条部から離れる方向にループ状に巻かれるループ状部とを有するインナプレートを備えているので、フレキシブルチューブは、最外端の凸条部を残りの凸条部と同じ高さに形成したにも拘らず、インナプレートにより最外端の凸条部とアウタブレードとの直接接触を回避できて、それらの接触部の摩耗を防止することができ、さらにインナプレートのループ状部は、最外端の凸条部に対して離れる方向に湾曲していることにより、該インナプレートのエッジ部分が、アウタブレードの内面と干渉することがなく、アウタブレードを損傷させることがない。
【図面の簡単な説明】
【図１】 本発明フレキシブルジョイント構造を自動車用エンジンに実施した場合の全体側面図（実施例）
【図２】 図１の２−２線に沿うフレキシブルジョイントの縦断側面図
【図３】 図２の仮想線囲い部分の拡大図
【図４】 フレキシブルジョイントの一部の縦断側面図（参考例）
【図５】 従来のフレキシブルジョイントの一部の縦断側面図
【符号の説明】
１・・・・上流側排気管
２・・・・下流側排気管
７・・・・フレキシブルチューブ
７ｂ・・・接続端部
Ｐ・・・・凸条部
Ｐｏ・・・最外端の凸条部
８・・・・アウタブレード
８ｂ・・・端壁部
９・・・・インナプレート
９ａ・・・プレート部
９ｂ・・・接続端部
９ｃ・・・ループ状部
ｓ・・・・間隙[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible joint structure in an exhaust system that is connected in the middle of an exhaust system that extends rearward of a vehicle body from a traveling engine that is disposed at the front of the vehicle body, mainly a vehicle.
[0002]
[Prior art]
Generally, in a vehicle such as an automobile, in which a traveling engine is arranged at the front part of the vehicle body, the exhaust system of the engine is extended from the front part of the vehicle body to the rear thereof, and the overall length thereof is long. For this reason, the vibrations generated when the vehicle is running and the engine vibrations are not evenly transmitted to the exhaust system, and stress such as bending, twisting, and shearing is locally applied to a part of the exhaust pipe constituting the exhaust system. This caused the exhaust pipe to crack.
[0003]
Therefore, conventionally, as shown in FIG. 5, in order to prevent the occurrence of such cracks, a flexible tube having a cross-sectional corrugated shape is connected in the middle of the exhaust pipe, and the stress is absorbed by the flexible tube. In addition, in order to prevent the flexible tube from being damaged by hitting a stepping stone repelled by a tire or the like during driving of the automobile, the outer periphery of the flexible tube is covered with a cylindrical outer blade. An inner plate is interposed in a portion where the outer peripheral surface of the outer end portion and the inner peripheral surface of the outer end portion of the outer blade rub against each other to prevent the occurrence of wear, cracks, and the like.
[0004]
[Problems to be solved by the invention]
However, in the prior art, as shown in FIG. 5, the inner plate for preventing the friction between the flexible tube and the outer blade is the outer peripheral surface of the outer end of the flexible tube and the inner end of the outer blade. Since it is arranged between the peripheral surface and is curved toward the ridge portion side so as to cover the ridge portion at the outermost end of the flexible tube, at least the ridge portion at the outermost end, It had to be formed lower than the remaining ridges.
[0005]
However, in general, in a corrugated flexible tube having a cross-section, if the height of the ridge is lowered, the spring constants in both the bending and elongation directions are increased, and the portion where the height of the ridge is lowered is closer to both ends. Since the spring constant in the bending direction tends to be higher, as described above, if the outermost convex portion of the flexible tube is set lower than the remaining convex portions, the bending and elongation of the entire flexible tube will occur. As a result, the spring constant of the direction becomes high, and as a result, there is a problem that the original function of the flexible joint, which absorbs stress such as bending and elongation due to oscillation of the exhaust system, is impaired. In order to solve such problems, measures such as the number of ridges, an increase in the height of the ridges, and a reduction in the thickness of the flexible tube are required, leading to an increase in the cost and size of the flexible joint. There is another problem.
[0006]
Further, in the conventional flexible joint, since the edge of the tip of the inner plate is close to the inner peripheral surface of the outer blade, this edge may interfere with the inner peripheral surface of the outer blade and damage the outer blade. There is also a problem that there is.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flexible joint structure in a novel exhaust system that improves all of the above problems by improving the flexible tube and the inner plate. It is.
[0008]
[Means for Solving the Problems]
In order to achieve the object, the invention according to claim 1 is a flexible joint structure in an exhaust system that connects an upstream exhaust pipe and a downstream exhaust pipe,
A flexible tube formed in a corrugated cross-section with alternating ridges and ridges having a plurality of same heights leaving the connection end, an outer blade covering the outer periphery of the flexible tube, A convex end portion of the outermost end of the flexible tube, and an inner plate provided between end wall portions of the outer blade, the inner plate having a connection end portion sandwiched between the outer blade and the flexible tube; From the inner side of this connecting end part, a plate part extending in the radial direction so as to be in close contact with the outer side surface of the outermost protruding part of the flexible tube, and from the outermost protruding part from the outer side in the radial direction of the plate part A loop-shaped portion wound in a loop shape in a direction away from the outer blade, and the height of the loop-shaped portion is higher than the height of the ridge portion of the flexible tube, An annular gap is formed between the flexible tubes. According to this feature, a flexible tube having a large number of ridges and ridges is formed with the same diameter over the entire length and is flexible. The spring constant in the bending direction and the extension direction of the tube does not increase, and in addition, the large number of ridges and ridges of the flexible tube do not come into contact with the outer blade. It is possible to increase the stress absorption relaxation efficiency and the vibration absorption efficiency of stress such as torsion and bending applied to the tube, and the flexible tube itself can be easily manufactured. In addition, the flexible tube has an inner plate that allows direct contact between the outermost ridge and the outer blade, even though the outermost ridge is formed at the same height as the remaining ridges. Therefore, the wear of those contact portions can be prevented, and the inner plate loop-shaped portion is curved in a direction away from the outermost convex portion, so that the edge of the inner plate can be prevented. The portion does not interfere with the inner surface of the outer blade and does not damage the outer blade .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0010]
First, description will be given real施例of the present invention with reference to FIGS.
[0011]
The actual施例is a flexible joint structure in the present invention the exhaust system, a case was conducted in an automobile engine, Figure 1, overall side view in which the present invention the flexible joint structure was performed of an automobile engine, FIG. 2 FIG. 3 is a longitudinal sectional side view of the flexible joint taken along line 2-2 in FIG. 1, and FIG.
[0012]
In FIG. 1, the traveling engine E is mounted horizontally (the crankshaft Sc is in a direction perpendicular to the front-rear direction of the automobile) at the front portion of the vehicle body B of the automobile. An intake system In is connected to an intake port opened on the front face of the engine E, and an exhaust system Ex is connected to an exhaust port opened on the rear face. The exhaust system Ex includes an exhaust manifold Me integrally connected to the exhaust port and an exhaust pipe Pe. The exhaust pipe Pe extends long in the front-rear direction under the floor of the automobile and includes an upstream exhaust pipe 1 and a downstream exhaust pipe 2. A spherical surface is provided between the exhaust manifold Me and the upstream exhaust pipe 1. The joint Jb is interposed, the flexible joint Jf according to the present invention is interposed between the upstream exhaust pipe 1 and the downstream exhaust pipe 2, and the catalytic converter Ca is interposed in the middle of the downstream exhaust pipe. Has been. The downstream side of the catalytic converter Ca is opened to the atmosphere via a silencer (not shown). The casing portion of the spherical joint Jb is supported by the main body portion of the engine E via the stay 3, and the connecting portion between the downstream exhaust pipe 2 and the catalytic converter Ca is a cross member of the vehicle body B via another stay 4. Is supported elastically.
[0013]
As shown in FIG. 2, the front and rear ends of the flexible joint Jf according to the present invention are welded between the downstream end of the upstream exhaust pipe 1 formed in a cylindrical shape and the upstream end of the downstream exhaust pipe 2. . Both the downstream side of the upstream side exhaust pipe 1 and the upstream side of the downstream side exhaust pipe 2 are formed to have small diameters as they go to the ends, and the minimum diameter between the downstream end and the upstream end is as follows. The flexible inner pipe 5 is connected in an airtight manner, and the exhaust gas flowing through the upstream exhaust pipe 2 flows to the downstream exhaust pipe 2 through the inner pipe 5.
[0014]
The flexible inner pipe 5 is formed by winding a band-shaped pipe material 5a in a spiral shape and crimping it, and covering the outer periphery with a pipe material 5b. This inner pipe 5 is conventionally known. Therefore, detailed description thereof is omitted.
[0015]
Next, the structure of the flexible joint Jf according to the present invention will be described in detail with reference to FIGS. 2 and 3. The flexible joint Jf includes a flexible tube 7, an outer blade 8 covering the outer periphery thereof, and a flexible tube. 7 is provided between the outer peripheral surfaces of both end portions and the inner peripheral surfaces of both end portions of the outer blade 8, before and after the inner plates 9, 9, and before and after the outer peripheral end portions of the outer blade 8 are covered. These are all constituted by a stainless steel plate.
[0016]
The flexible tube 7 constitutes a large part of the tube, and is formed in a cylindrical shape formed in the same diameter over the entire length by forming a corrugated longitudinal section in which a large number of ridges P... And dents D. A portion 7a and cylindrical connecting end portions (attachment end portions) 7b and 7b extending in the axial direction from the base portion of the convex portion Po at the outermost end of the cylindrical portion 7a. As shown clearly in FIG. 3, the cross-sectional shape of each ridge portion P and each ridge portion D gradually expands from the base end portion to the tip end portion. The tip of each is formed wider than their base. The bases of the left and right outermost protruding strips Po, Po are integrally connected to both end connection portions (attachment portions) 7b, 7b of the flexible tube 7.
[0017]
On the other hand, the outer blade 8 includes a straight cylindrical portion 8a covering the corrugated cylindrical portion 7a of the flexible tube 7, and an end wall portion bent radially inward from both front and rear ends of the cylindrical portion 8a. 8b, 8b, and connecting end portions (attachment portions) 8c, 8c at both ends of a small cylindrical shape extending in the axial direction from the inside of the end wall portions 8b, 8b. Further, the inner plate 9 includes a connection end 9b sandwiched between the outer blade 8 and the connection ends 8c and 7b of the flexible tube 7, and the flexible tube 7 from the inner side in the axial direction of the connection end 9b. From the plate portion 9a extending radially outward so as to face the outer surface of the outermost convex portion Po in close contact with the outermost convex portion Po from the radial outer end of the plate portion 9a A loop-shaped portion 9c wound in a loop shape in a direction away from the loop-shaped portion 9c. The loop-shaped portion 9c is higher than the ridges P and Po of the flexible tube 7, that is, is formed larger in the radial direction. Between the inner peripheral surface of the straight cylindrical portion 8a of the outer blade 8 covering the corrugated cylindrical portion 7a of the flexible tube 7 and the outer peripheral surface of the corrugated cylindrical portion 7a of the flexible tube 7. , Annular gap s is formed, which even when the flexible joint Jf is flexed is so as not to contact.
[0018]
The front and rear outer ends including the connection end 8 c and the end wall 8 b of the outer blade 8 are covered with the end plate 10.
[0019]
As clearly shown in FIG. 3, the connection ends 7 b, 9 b and 8 c of the flexible tube 7, the inner plate 9 and the outer blade 8 are sequentially laminated, and the connection end 8 c of the outer blade 8 is further stacked. The connection end portions of the end plate 10 are laminated on the outer surface, and both end edges thereof are welded to the downstream end portion of the upstream exhaust pipe 1 and the outer periphery of the upstream end portion of the downstream exhaust pipe 2.
[0020]
Next, a description will be given of the operation of the real施例.
[0021]
The exhaust gas generated by the operation of the engine E now passes through the exhaust manifold Me, the spherical joint Jb, the upstream side exhaust pipe 1, the flexible joint Jf, the downstream side exhaust pipe 2, the catalytic converter Ca, and a silencer (not shown). , CO and other harmful components are purified, and the exhaust noise is silenced and released to the atmosphere.
[0022]
By the way, the exhaust system Ex is disposed under the floor of the automobile, and its entire length is long. Therefore, the vibration generated when the automobile travels and the operating vibration of the engine E are not evenly transmitted to the entire exhaust system, and the upstream The side and downstream side exhaust pipes 1 and 2 generate stress in the twisting direction and bending direction, and this stress can be absorbed and relaxed by the flexible joint Jf. In particular, in this embodiment according to the present invention, the cylindrical portion 7a having a large number of ridges P ... and dents D ... of the flexible tube 7 is formed to have the same diameter over its entire length. Since the convex portion Po at the outer end is not lower than the remaining convex portion P (the conventional one), the spring constant in the bending direction and the extending direction of the flexible tube 7 is not increased. Since the cylindrical portion 7a of the flexible tube 7 does not come into contact with the outer blade 8, the absorption and relaxation efficiency of stress such as torsion and bending applied to the upstream and downstream exhaust pipes 1 and 2 and its vibration absorption efficiency are reduced. The flexible tube 7 itself can be easily manufactured. In addition, the flexible tube 7 has the outermost convex portion Po and the outer blade formed by the inner plate 9 even though the outermost convex portion Po is formed at the same height as the remaining convex portion P. Since the direct contact with 8 is avoided, the wear of those contact portions can be prevented, and the loop-like portion 9c of the inner plate 9 is curved in a direction away from the outermost convex portion Po. As a result, the edge portion of the inner plate 9 does not interfere with the inner surface of the outer blade 8, and the outer blade 8 is not damaged.
[0023]
Next, a reference example will be described with reference to FIG.
[0024]
Figure 4 is a partial sectional view of a full lexical Bull joint, the same elements as the in FIG real施例, same reference numerals are attached.
[0025]
The reference example, in those of the real施例, an outer surface of the convex portion Po of the outermost end of the flexible tube 7, between the plate-shaped portion 9a extending in a radial direction of the inner plate 9, an annular gap a case of forming the d, other configurations are the same as those of the real施例.
[0026]
Thus, in this reference example, due to the presence of the gap d, the outermost convex portion Po of the tubular portion 7a of the flexible tube 7 can be shifted to the inner plate 9 side, Thereby, the spring constant of the flexible tube 7 can be further reduced, and the vibration absorption efficiency can be further increased.
[0027]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.
[0028]
【The invention's effect】
As described above, according to the invention as claimed in claim 1, a flexible tube having a convex portion and the concave portion of the multi-number, since it is formed in the same diameter over its entire length, the flexible tube bending direction and elongation The spring constant in the direction does not increase, and the ridges and ridges of the flexible tube do not come into contact with the outer blade, so twisting, bending, etc. on the upstream and downstream exhaust pipes The stress absorption relaxation efficiency and the vibration absorption efficiency can be increased, and the flexible tube itself can be easily manufactured.
[0029]
A connecting end portion sandwiched between the outer blade and the flexible tube; and a plate portion extending in the radial direction so as to be in close contact with the outer surface of the outermost convex portion of the flexible tube from the inside of the connecting end portion; The flexible tube is provided with an inner plate having a loop-like portion wound in a loop shape in a direction away from the outermost convex portion from the radially outer side of the plate portion. In spite of forming the same height as the rest of the ridges, the inner plate can avoid the direct contact between the outermost ridges and the outer blade, and prevent wear of those contact parts Furthermore, the loop portion of the inner plate is bent in a direction away from the convex portion at the outermost end, so that the edge portion of the inner plate interferes with the inner surface of the outer blade. There is no Rukoto, there is no damaging the outer blade.
[Brief description of the drawings]
[1] The present invention overall side view in the case where the flexible joint structure carried on an automobile engine (actual施例)
2 is a longitudinal side view of the flexible joint taken along line 2-2 in FIG. 1. FIG. 3 is an enlarged view of the imaginary line enclosing portion in FIG. 2. FIG. 4 is a longitudinal side view of a part of the flexible joint ( reference example).
[Fig. 5] Vertical side view of a part of a conventional flexible joint [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 .... Upstream side exhaust pipe 2 .... Downstream side exhaust pipe 7 ... Flexible tube 7b ... Connection end P ... Projection part Po ... Outermost projection Portion 8 ··· Outer blade 8b ··· End wall portion 9 ··· Inner plate 9a · · · Plate portion 9b · · · Connection end portion 9c · · · Loop-shaped portion s ··· Gap

Claims (1)

上流側排気管（１）と、下流側排気管（２）とを接続する排気系におけるフレキシブルジョイント構造であって、
接続端部（７ｂ）を残して多数の同じ高さの、凸条部（Ｐ）と凹条部（Ｄ）とを交互に有して断面コルゲート状に形成されるフレキシブルチューブ（７）と、このフレキシブルチューブ（７）の外周を覆うアウタブレード（８）と、前記フレキシブルチューブ（７）の最外端の凸条部（Ｐｏ）と、前記アウタブレード（８）の端壁部（８ｂ）間に設けられるインナプレート（９）とを備え、
前記インナプレート（９）は、前記アウタブレード（８）とフレキシブルチューブ（７）間に挟持される接続端部（９ｂ）と、この接続端部（９ｂ）の内側からフレキシブルチューブ（７）の最外端の凸条部（Ｐｏ）の外側面に密着するように径方向に伸びるプレート部（９ａ）と、そのプレート部（９ａ）の径方向外側より前記最外端の凸条部（Ｐｏ）から離れる方向にループ状に巻かれるループ状部（９ｃ）とを有し、
そのループ状部（９ｃ）の高さが、前記フレキシブルチューブ（７）の凸条部（Ｐ，Ｐｏ）の高さよりも高く、アウタブレード（８）とフレキシブルチューブ（７）の間に環状の間隙（ｓ）を形成してなることを特徴とする、排気系におけるフレキシブルジョイント構造。 A flexible joint structure in an exhaust system that connects an upstream exhaust pipe (1) and a downstream exhaust pipe (2),
A flexible tube (7) formed in a cross-sectional corrugated shape having alternating ridges (P) and dents (D) of a number of the same height, leaving the connection end (7b), Between the outer blade (8) that covers the outer periphery of the flexible tube (7), the outermost protrusion (Po) of the flexible tube (7), and the end wall (8b) of the outer blade (8) An inner plate (9) provided in the
The inner plate (9) includes a connection end (9b) sandwiched between the outer blade (8) and the flexible tube (7), and an innermost portion of the flexible tube (7) from the inside of the connection end (9b). A plate portion (9a) extending in the radial direction so as to be in close contact with the outer side surface of the convex portion (Po) at the outer end, and the convex portion (Po) at the outermost end from the radial outer side of the plate portion (9a). A loop portion (9c) wound in a loop shape in a direction away from
The height of the loop-shaped part (9c) is higher than the height of the convex part (P, Po) of the flexible tube (7), and an annular gap is formed between the outer blade (8) and the flexible tube (7). (s) to form, characterized by comprising, flexible joint structure in the exhaust system.
JP2002121243A 2002-04-23 2002-04-23 Flexible joint structure in exhaust system Expired - Fee Related JP3954892B2 (en)

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KR100602770B1 (en) * 2004-07-20 2006-07-20 주식회사 에스제이엠 Flexible Tube for Exhaust Pipe of automobile
JP4815522B2 (en) * 2009-09-30 2011-11-16 本田技研工業株式会社 Flexible Tube
KR101933945B1 (en) * 2014-03-27 2018-12-31 주식회사 에스제이엠 Flexible conduit tube and a connecting device for use in exhaust systems
CN105134356B (en) * 2015-08-06 2017-12-01 天津市神驰汽车零部件有限公司 A kind of tailpipe with absorption plant

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