JP2004011607A

JP2004011607A - Exhaust pipe joint device

Info

Publication number: JP2004011607A
Application number: JP2002170124A
Authority: JP
Inventors: Yoshikazu Sakairi; 坂入　良和; Kohei Kurose; 黒瀬　講平
Original assignee: Oiles Industry Co Ltd
Current assignee: Oiles Industry Co Ltd
Priority date: 2002-06-11
Filing date: 2002-06-11
Publication date: 2004-01-15
Anticipated expiration: 2022-06-11
Also published as: JP4325149B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe joint device which generates no abnormal sound due to stick slip or the like, gives no unpleasant feeling to a driver, and prevents position difference of a structuring member and the generation of a clearance between sliding surfaces, even when force in a twisting direction and a sharing direction is inputted on an exhaust pipe connected to a manifold. <P>SOLUTION: In the exhaust pipe joint device 1, an upstream side exhaust pipe 2 and a downstream side exhaust pipe 3 are disposed so as to be opposite to each other at each end surface 4, 5 by spacing. A flange member 8 having a toroidal concave surface 7 is attached to a pipe end portion 6 of the downstream side exhaust pipe 3, and a flange member 11 having a conical concave surface 10 is attached to a pipe end portion 9 of the downstream side exhaust pipe 3. An annular seal element 16 having a concave spherical surface 15 is attached to the conical concave surface 10. The flange member 8, 11 are elastically energized in an axial direction to come close to each other by a pair of elastic means 17, so as to elastically press the toroidal convex surface 7 on the concave surface 15. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、排気管継手装置、特に自動車の排気管継手装置に関する。
【０００２】
【発明が解決しようとする課題】
自動車エンジンの排気ガスは、エンジンから車体フレームなどに配置された排気管に導かれて大気中に排出されるが、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操り返し曲げ応力を受けるので、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にもなるばかりでなく排気管の疲労折損などの不具合を生じる危険もある。このような問題を解決するために、球面管継手（環状シール体）を有した排気管継手装置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。
【０００３】
球面管継手は、多くの場合、その凸球面状外面で、下流側排気管の端部に固着されたフランジ部材の凹球面状内面に摺動自在に接触するようにして、その内周面で上流側排気管の管端部の外周面に嵌装されて用いられ、フランジ部材の凹球面状内面に対する凸球面状外面の相対的な摺動で応力を吸収するようにしている。
【０００４】
ところで、前輪駆動横置きエンジン（ＦＦ車）では、一般に、エンジンのマニホールド近傍に排気管継手装置が配置されるのであるが、斯かるＦＦ車の場合には、マニホールドでの曲げ応力が縦置きエンジンの場合に比較してかなり大きいものとなり、マニホールドに接続される排気管には剪断方向（排気管の管軸と直交する方向）の力に加えて、特に捩り方向（排気管の管軸を中心とした回転方向）の力が大きく加わり、この力が排気管継手装置にも入力されることになる。
【０００５】
排気管継手装置に捩り方向の力が大きく加わると、互いに嵌合された球面管継手の内周面と上流側排気管の管端部の外周面との間でスティックスリップが生じ、スティックスリップに起因する異音が発生して自動車の運転者、乗客に不快感を与えることになる。
【０００６】
この問題を解決すべく種々の技術が提案されているが、提案の一つの技術には、球面管継手をその内周面で上流側排気管の管端部の外周面に装着しないで、代わりに、その外周面でフランジ部材に装着して、これによりスティックスリップに起因する異音の発生を防止するようにしたものがあるが、斯かる技術によれば、構成部材の位置ずれ及び摺動面間での隙間が生じ易く、必ずしも満足し得るものではない。
【０００７】
本発明は前記諸点に鑑みてなされたものであって、その目的とするところは、マニホールドに接続された排気管に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等に起因する異常音を発生させることがなく、運転者に不快感を与えることがない上に、構成部材の位置ずれ及び摺動面間での隙間の生じない排気管継手装置を提供することにある。
【０００８】
【課題を解決するための手段】
本発明の第一の態様の排気管継手装置は、上流側排気管と下流側排気管とをそれぞれの端面で隙間を残して相対峙して配置し、上流側排気管と下流側排気管とのうちの一方の排気管の管端部に凹球面を有する環状シール体を設け、上流側排気管と下流側排気管とのうちの他方の排気管の管端部に、凹球面に摺動自在に接触すると共に、凹球面の曲率中心から一方の排気管方向側に所与の距離だけ離れた軸心上の位置を中心とする円であって軸方向に直交する面内に位置する円の上を曲率中心とし且つ凹球面の曲率半径Ｒに対して小さい曲率半径ｒのトロイダル凸曲面を設け、両排気管の管端部間に、トロイダル凸曲面を凹球面に弾性的に押圧する弾性押圧手段を設けてなる。
【０００９】
第一の態様の排気管継手装置によれば、環状シール体の凹球面にトロイダル凸曲面を摺動自在に接触させるために、摺動面が限られた領域となる結果、マニホールドに接続された排気管に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等の発生確率が減少して、スティックスリップ等に起因する異常音を実質的に発生させることがなく、運転者に不快感を与えることがない上に、トロイダル凸曲面を環状シール体の凹球面で包むようになるために、構成部材の位置ずれ及び摺動面での隙間を生じさせないようにし得る。
【００１０】
また第一の態様の排気管継手装置によれば、環状シール体と排気管の管端部の外周面との間での摺動がなくなる結果、ここでのスティックスリップの発生がなく、而して、マニホールドに接続された排気管に捩り方向の力が入力された場合においても、スティックスリップ等に起因する異常音を上記と相俟って発生させることがない。
【００１１】
本発明の第一の態様における環状シール体は、好ましい例ではその第二の態様の排気管継手装置のように、ポリテトラフルオロエチレン樹脂と金網からなる補強材との圧縮成形物からなる潤滑すべり層を有しており、ここで、凹球面は、ポリテトラフルオロエチレン樹脂と金網からなる補強材とが混在一体となっている潤滑すべり層の平滑な露出面からなる。
【００１２】
上記の態様の排気管継手装置では、トロイダル凸曲面を下流側排気管の管端部に、環状シール体を上流側排気管の管端部に夫々設けてもよいのであるが、好ましくは本発明の第三の態様の排気管継手装置のように、トロイダル凸曲面は上流側排気管の管端部に、環状シール体は下流側排気管の管端部に設けられている。
【００１３】
本発明の第四の態様の排気管継手装置は、上流側排気管と下流側排気管とをそれぞれの端面で隙間を残して相対峙して配置し、上流側排気管と下流側排気管とのうちの一方の排気管の管端部に凸球面を設け、上流側排気管と下流側排気管とのうちの他方の排気管の管端部に、凸球面に摺動自在に接触すると共に、凸球面の曲率中心から一方の排気管方向側に所与の距離だけ離れた軸心上の位置を中心とする円であって軸方向に直交する面内に位置する円の上を曲率中心とし且つ凸球面の曲率半径ｒに対して大きい曲率半径Ｒのトロイダル凹曲面を有する環状シール体を設け、両排気管の管端部間に、凸球面をトロイダル凹曲面に弾性的に押圧する弾性押圧手段を設けてなる。
【００１４】
第四の態様の排気管継手装置によれば、第一の態様の排気管継手装置と同様に、環状シール体のトロイダル凹曲面を凸球面に摺動自在に接触させるために、摺動面が限られた領域となる結果、マニホールドに接続された排気管に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等の発生確率が減少して、スティックスリップ等に起因する異常音を実質的に発生させることがなく、運転者に不快感を与えることがない上に、凸球面を環状シール体のトロイダル凹曲面で包むようになるために、構成部材の位置ずれ及び摺動面での隙間を生じさせないようにできる。
【００１５】
また第四の態様の排気管継手装置でも、環状シール体と排気管の管端部の外周面との間での摺動がなくなる結果、ここでのスティックスリップの発生がなく、而して、マニホールドに接続された排気管に捩り方向の力が入力された場合においても、スティックスリップ等に起因する異常音を上記と相俟って発生させることがない。
【００１６】
本発明の第四の態様における環状シール体も、好ましい例ではその第五の態様の排気管継手装置のように、ポリテトラフルオロエチレン樹脂と金網からなる補強材との圧縮成形物からなる潤滑すべり層を有しており、ここで、トロイダル凹曲面は、ポリテトラフルオロエチレン樹脂と金網からなる補強材とが混在一体となっている潤滑すべり層の平滑な露出面からなる。
【００１７】
上記の第四又は第五の態様の排気管継手装置でも、凸球面を下流側排気管の管端部に、環状シール体を上流側排気管の管端部に夫々設けてもよいのであるが、好ましくは本発明の第六の態様の排気管継手装置のように、凸球面は上流側排気管の管端部に、環状シール体は下流側排気管の管端部に設けられている。
【００１８】
本発明において環状シール体は、好ましい例ではその第七の態様の排気管継手装置のように、主に膨張黒鉛を含んだ耐熱材と、この耐熱材が隙間に配されていると共に耐熱材と混在一体となった金網からなる補強材との圧縮成形物からなる。
【００１９】
次に本発明の実施の形態を、図に示す好ましい例に基づいてさらに詳細に説明する。なお、本発明はこれら例には何等限定されないのである。
【００２０】
【発明の実施の形態】
図１に示す排気管継手装置１は、上流側排気管２と下流側排気管３とをそれぞれの端面４及び５で隙間を残して相対峙して配置し、上流側排気管２と下流側排気管３とのうち、自動車エンジンのマニホールドに接続された上流側排気管２の管端部６には、トロイダル凸曲面７を有するフランジ部材８が取り付けられており、上流側排気管２と下流側排気管３とのうち、大気側に配された下流側排気管３の管端部９には、円錐凹面１０を有するフランジ部材１１が取り付けられており、円錐凹面１０には、凹球面１５を有した環状シール体１６が装着されており、フランジ部材８及び１１は、トロイダル凸曲面７を凹球面１５に弾性的に押圧するべく、一対の弾性手段１７により互いに接近するように軸方向に弾性的に付勢されている。
【００２１】
フランジ部材８は、トロイダル凸曲面７に加えて、管端部６内と管端部９内とを連通する貫通孔３１を規定する内周面３２を有すると共に、トロイダル凸曲面７が設けられたフランジ基部３３と、フランジ基部３３と一体に形成されていると共に、一対の貫通孔３４を有したフランジ部３５とを具備しており、フランジ基部３３において管端部６に溶接等により固着されて取り付けられている。
【００２２】
上流側排気管２の管端部６にフランジ部材８を介して設けられていると共に、凹球面１５に摺動自在に接触したトロイダル凸曲面７は、凹球面１５の曲率中心Ｏ１から下流側排気管３方向側に所与の距離δＬ１だけ離れた軸心Ｘ上の位置３６を中心とすると共に、軸方向に直交する面（図１の紙面に直交する面）内に位置する曲率半径Δｒ１の円の上を曲率中心Ｏ２とし且つ凹球面１５の曲率半径Ｒに対して小さい曲率半径ｒを有している。
【００２３】
トロイダル凸曲面７は、上流側排気管２及び下流側排気管３間に剪断方向の相対角変位（揺動）が生じていない際に、曲率中心Ｏ１と曲率中心Ｏ２とを結ぶ線の延長線上の位置３７を略中央として凹球面１５に面接触している。
【００２４】
フランジ部材１１は、円錐凹面１０に加えて、円錐凹面１０に連接すると共に、軸方向に対して実質的に直交する面からなる環状平坦内面４１を更に有しているフランジ基部４２と、フランジ基部４２と一体に形成されていると共に、一対の貫通孔４３を有したフランジ部４４とを具備しており、フランジ基部４２において管端部９に溶接等により固着されて取り付けられている。
【００２５】
下流側排気管３の管端部９にフランジ部材１１を介して設けられていると共に、凹球面１５を有する環状シール体１６は、主に膨張黒鉛を含んだ耐熱材と、この耐熱材が隙間に配されていると共に耐熱材と混在一体となった金網からなる補強材との圧縮成形物からなって、凹球面１５を有した内面側に、ポリテトラフルオロエチレン樹脂と金網からなる補強材との圧縮成形物からなる潤滑すべり層５１を有しており、凹球面１５は、ポリテトラフルオロエチレン樹脂と金網からなる補強材とが混在一体となっている潤滑すべり層５１の平滑な露出面からなっている。
【００２６】
また、環状シール体１６は、円錐凹面１０に対応して円錐外面５２を有している上に、軸方向に対して実質的に直交する面からなると共に、環状平坦内面４１に当接する環状平坦端面５３を有しており、円錐外面５２及び環状平坦端面５３でフランジ部材１１の円錐凹面１０及び環状平坦内面４１に接触して装着されている。
【００２７】
両排気管２及び３の管端部６及び９間に設けられた弾性手段１７は、一端部がフランジ部３５の各貫通孔３４を貫通した一対のボルト６１と、各ボルト６１の一端部に螺着されたナット６２と、各ボルト６１を囲繞していると共に各ボルト６１の頭部６３とフランジ部４４との間に配された一対のコイルばね６４とを具備しており、トロイダル凸曲面７の凹球面１５への摺動自在な接触を確保する弾性力を発生している。
【００２８】
以上の排気管継手装置１において、上流側排気管２及び下流側排気管３間に生ずる剪断方向の相対角変位（揺動）及び捩り方向の相対的回転（捩り）は、潤滑すべり層５１の露出面である環状シール体１６の凹球面１５とフランジ部材８のトロイダル凸曲面７との相対的な摺動で許容される。
【００２９】
そして、排気管継手装置１においては、環状シール体１６の凹球面１５にトロイダル凸曲面７を摺動自在に接触させるために、相互の摺動面が限られた領域となる結果、マニホールドに接続された上流側排気管２に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等の発生確率が減少して、スティックスリップ等に起因する異常音を実質的に発生させることがなく、運転者に不快感を与えることがない上に、トロイダル凸曲面７を環状シール体１６の凹球面１５で包むようになるために、フランジ部材８を軸方向の位置及び大きな揺動に関して拘束できて、フランジ部材８の先端部が過度に環状シール体１６に嵌入されることを防止できる上に、フランジ部材８が環状シール体１６から離反することを防止でき、而して、フランジ部材８の位置ずれを生じさせないようにし得ると共に、トロイダル凸曲面７と凹球面１５との間の摺動面に隙間を生じさせないようにし得る。
【００３０】
更に、排気管継手装置１においては、環状シール体１６がフランジ部材１１の円錐凹面１０に装着されているために、環状シール体１６と上流側排気管２の管端部６の外周面との間又は下流側排気管３の管端部９の外周面との間での摺動がなくなる結果、ここでのスティックスリップの発生がなく、而して、マニホールドに接続された上流側排気管２に捩り方向の力が入力された場合においても、スティックスリップ等に起因する異常音を発生させることがない。
【００３１】
また、排気管継手装置１においては、フランジ部材１１の環状平坦内面４１に環状シール体１６の環状平坦端面５３が当接しているために、弾性手段１７による環状シール体１６の軸方向の移動を確実に阻止でき、環状シール体１６の位置がフランジ部材１１に対して弾性手段１７による弾性力により軸方向にずれることがなくなる。
【００３２】
ところで、上記の排気管継手装置１においては、トロイダル凸曲面７を有してフランジ部材８を構成する一方、凹球面１５を有して環状シール体１６を構成したが、これに代えて、図２に示すように、凸球面７１を有してフランジ部材８を構成する一方、トロイダル凹曲面７２を有して環状シール体１６を構成してもよい。
【００３３】
即ち、図２に示す排気管継手装置１においては、上流側排気管２の管端部６には、凸球面７１を有するフランジ部材８が取り付けられており、下流側排気管３の管端部９に取り付けられたフランジ部材１１の円錐凹面１０には、トロイダル凹曲面７２を有した環状シール体１６が装着されている。
【００３４】
上流側排気管２の管端部６にフランジ部材８を介して設けられた凸球面７１は、一対の弾性手段１７によりトロイダル凹曲面７２に弾性的に押圧されて当該トロイダル凹曲面７２に摺動自在に接触しており、下流側排気管３の管端部９にフランジ部材１１を介して設けられた環状シール体１６のトロイダル凹曲面７２は、凸球面７１の曲率中心Ｏ３から上流側排気管２方向側に所与の距離δＬ２だけ離れた軸心Ｘ上の位置７５を中心とすると共に、軸方向に直交する面（図２の紙面に直交する面）内に位置する曲率半径Δｒ２の円の上を曲率中心Ｏ４とし且つ凸球面７１の曲率半径ｒに対して大きい曲率半径Ｒを有しており、本例においても、主に膨張黒鉛を含んだ耐熱材と、この耐熱材が隙間に配されていると共に耐熱材と混在一体となった金網からなる補強材との圧縮成形物からなる環状シール体１６は、ポリテトラフルオロエチレン樹脂と金網からなる補強材との圧縮成形物からなる潤滑すべり層７６をトロイダル凹曲面７２側に有しており、潤滑すべり層７６の平滑な露出面からなるトロイダル凹曲面７２は、上流側排気管２及び下流側排気管３間に剪断方向の相対角変位（揺動）が生じていない際に、曲率中心Ｏ４と曲率中心Ｏ３とを結ぶ線の延長線上の位置７７を略中央として凸球面７１に面接触している。
【００３５】
図２に示す排気管継手装置１でも、図１に示す排気管継手装置１と同様に、上流側排気管２及び下流側排気管３間に生ずる剪断方向の相対角変位（揺動）及び捩り方向の相対的回転（捩り）は、フランジ部材８の凸球面７１と潤滑すべり層７６の露出面である環状シール体１６のトロイダル凹曲面７２との相対的な摺動で許容される。
【００３６】
そして、図２に示す排気管継手装置１においては、環状シール体１６のトロイダル凹曲面７２に凸球面７１を摺動自在に接触させるために、相互の摺動面が限られた領域となる結果、マニホールドに接続された上流側排気管２に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等の発生確率が減少して、スティックスリップ等に起因する異常音を実質的に発生させることがなく、運転者に不快感を与えることがない上に、フランジ部材８の凸球面７１を環状シール体１６のトロイダル凹曲面７２で包むようになるために、フランジ部材８を軸方向の位置及び大きな揺動に関して拘束できて、フランジ部材８の先端部が過度に環状シール体１６に嵌入されることを防止できる上に、フランジ部材８が環状シール体１６から離反することを防止でき、而して、フランジ部材８の位置ずれを生じさせないようにし得ると共に、凸球面７１とトロイダル凹曲面７２との間の摺動面に隙間を生じさせないようにし得る。
【００３７】
更に、図２に示す排気管継手装置１においても、環状シール体１６がフランジ部材１１の円錐凹面１０に装着されているために、環状シール体１６と上流側排気管２の管端部６の外周面との間又は下流側排気管３の管端部９の外周面との間での摺動がなくなる結果、ここでのスティックスリップの発生がなく、而して、マニホールドに接続された上流側排気管２に捩り方向の力が入力された場合においても、スティックスリップ等に起因する異常音を発生させることがない上に、フランジ部材１１の環状平坦内面４１に環状シール体１６の環状平坦端面５３が当接しているために、弾性手段１７による環状シール体１６の軸方向の移動を確実に阻止でき、環状シール体１６の位置がフランジ部材１１に対して弾性手段１７による弾性力により軸方向にずれることがなくなる。
【００３８】
【発明の効果】
本発明によれば、マニホールドに接続された排気管に捩り方向及び剪断方向の力が入力された場合においても、スティックスリップ等に起因する異常音を発生させることがなく、運転者に不快感を与えることがない上に、構成部材の位置ずれ及び摺動面間での隙間の生じない排気管継手装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態の好ましい一例の縦断面図である。
【図２】本発明の実施の形態の好ましい他の例の縦断面図である。
【符号の説明】
１　排気管継手装置
２　上流側排気管
３　下流側排気管
４、５　端面
６、９　管端部
８、１１　フランジ部材
１０　円錐凹面
１５　凹球面
１６　環状シール体
１７　弾性手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an exhaust pipe coupling device, and more particularly to an exhaust pipe coupling device for an automobile.
[0002]
[Problems to be solved by the invention]
Exhaust gas from an automobile engine is guided from an engine to an exhaust pipe arranged on a body frame or the like, and is exhausted into the atmosphere. This exhaust pipe is subjected to bending stress due to engine torque reaction and inertia. Therefore, there is a danger that the vibration of the engine is transmitted through the exhaust pipe suspension device and is brought into the vehicle interior, or not only causes noise, but also causes a problem such as fatigue breakage of the exhaust pipe. In order to solve such a problem, measures have been taken such as disposing an exhaust pipe joint device having a spherical pipe joint (annular seal body) to absorb stress.
[0003]
In many cases, the spherical pipe joint has its convex spherical outer surface slidably in contact with the concave spherical inner surface of the flange member fixed to the end of the downstream exhaust pipe, and the inner peripheral surface thereof It is used by being fitted to the outer peripheral surface of the pipe end of the upstream side exhaust pipe, and absorbs stress by relative sliding of the convex spherical outer surface with respect to the concave spherical inner surface of the flange member.
[0004]
By the way, in a front-wheel-drive laterally mounted engine (FF vehicle), an exhaust pipe joint device is generally arranged near an engine manifold. In the case of such an FF vehicle, the bending stress in the manifold is reduced by a vertical engine. The exhaust pipe connected to the manifold exerts a force in the shearing direction (a direction perpendicular to the pipe axis of the exhaust pipe), and especially in the torsional direction (centering on the pipe axis of the exhaust pipe). (In the rotation direction described above), and this force is also input to the exhaust pipe joint device.
[0005]
When a large force in the torsional direction is applied to the exhaust pipe joint device, stick slip occurs between the inner peripheral surface of the fitted spherical pipe joint and the outer peripheral surface of the pipe end of the upstream exhaust pipe. As a result, abnormal noise is generated, which causes discomfort to the driver and the passenger of the automobile.
[0006]
Various techniques have been proposed to solve this problem, but one of the proposed techniques is to attach a spherical joint to the outer peripheral surface of the pipe end of the upstream exhaust pipe on its inner peripheral surface instead of mounting it. In some cases, the outer peripheral surface is attached to a flange member to thereby prevent the generation of abnormal noise caused by stick-slip. Gaps between the surfaces are likely to occur, which is not always satisfactory.
[0007]
The present invention has been made in view of the above-described points, and has an object to cause stick-slip or the like even when torsional and shear forces are input to an exhaust pipe connected to a manifold. An object of the present invention is to provide an exhaust pipe coupling device that does not generate abnormal noise and does not give a driver an uncomfortable feeling, and that does not cause displacement of constituent members and no gap between sliding surfaces.
[0008]
[Means for Solving the Problems]
In the exhaust pipe coupling device of the first aspect of the present invention, the upstream exhaust pipe and the downstream exhaust pipe are disposed so as to face each other with a gap left at each end surface, and the upstream exhaust pipe and the downstream exhaust pipe are disposed. An annular seal body having a concave spherical surface is provided at a pipe end of one of the exhaust pipes, and a concave spherical surface is slid on the pipe end of the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe. A circle centered on a position on the axis that is freely contacted and that is separated from the center of curvature of the concave spherical surface by a given distance to one exhaust pipe direction side and that is located in a plane orthogonal to the axial direction. Is provided with a toroidal convex surface having a radius of curvature r with respect to the radius of curvature R of the concave spherical surface with a center of curvature above, and elastically pressing the toroidal convex curved surface against the concave spherical surface between the pipe ends of both exhaust pipes. Pressing means is provided.
[0009]
According to the exhaust pipe coupling device of the first aspect, the toroidal convex curved surface is slidably contacted with the concave spherical surface of the annular seal body. Even when forces in the torsional and shear directions are input to the exhaust pipe, the probability of occurrence of stick-slip and the like is reduced, and substantially no abnormal noise due to stick-slip or the like is generated, and the In addition to giving no discomfort, the toroidal convex curved surface is wrapped by the concave spherical surface of the annular seal body, so that it is possible to prevent the displacement of the constituent members and the generation of a gap in the sliding surface.
[0010]
Further, according to the exhaust pipe joint device of the first aspect, as a result of the sliding between the annular seal body and the outer peripheral surface of the pipe end of the exhaust pipe being eliminated, there is no occurrence of stick-slip here. Therefore, even when a force in the torsional direction is input to the exhaust pipe connected to the manifold, abnormal noise due to stick-slip or the like is not generated in combination with the above.
[0011]
In a preferred example, the annular seal body according to the first aspect of the present invention is a lubricating slide made of a compression-molded product of a polytetrafluoroethylene resin and a reinforcing member made of a wire mesh, as in the exhaust pipe coupling device of the second aspect. Here, the concave spherical surface has a smooth exposed surface of a lubricating sliding layer in which a polytetrafluoroethylene resin and a reinforcing material made of a metal mesh are mixed and integrated.
[0012]
In the exhaust pipe joint device of the above aspect, the toroidal convex curved surface may be provided at the pipe end of the downstream exhaust pipe, and the annular seal body may be provided at the pipe end of the upstream exhaust pipe. As in the exhaust pipe coupling device of the third aspect, the toroidal convex curved surface is provided at the pipe end of the upstream exhaust pipe, and the annular seal body is provided at the pipe end of the downstream exhaust pipe.
[0013]
An exhaust pipe coupling device according to a fourth aspect of the present invention is arranged such that an upstream exhaust pipe and a downstream exhaust pipe face each other with a gap left at each end face, and an upstream exhaust pipe and a downstream exhaust pipe are arranged. A convex spherical surface is provided at the pipe end of one of the exhaust pipes, and the pipe end of the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe is slidably contacted with the convex spherical face. , The center of curvature on a circle centered on a position on the axial center separated by a given distance from the center of curvature of the convex spherical surface toward one exhaust pipe and located in a plane orthogonal to the axial direction And an annular seal having a toroidal concave surface having a radius of curvature R larger than the radius of curvature r of the convex spherical surface, and elastically pressing the convex spherical surface against the toroidal concave surface between the ends of the two exhaust pipes. Pressing means is provided.
[0014]
According to the exhaust pipe coupling device of the fourth aspect, like the exhaust pipe coupling device of the first aspect, the sliding surface is slidably contacting the toroidal concave curved surface of the annular seal body with the convex spherical surface. As a result, even if a torsional or shearing force is input to the exhaust pipe connected to the manifold, the probability of occurrence of stick-slip or the like is reduced, resulting in abnormal noise caused by stick-slip or the like. Does not substantially occur, and does not give the driver any discomfort.In addition, since the convex spherical surface is wrapped by the toroidal concave curved surface of the annular seal body, the displacement of the constituent members and the sliding surface Can be prevented from being generated.
[0015]
Also in the exhaust pipe coupling device of the fourth aspect, as a result of eliminating sliding between the annular seal body and the outer peripheral surface of the pipe end of the exhaust pipe, there is no occurrence of stick-slip here. Even when a torsional force is input to the exhaust pipe connected to the manifold, abnormal noise caused by stick-slip or the like is not generated in combination with the above.
[0016]
In a preferred example, the annular seal body according to the fourth aspect of the present invention is also a lubricating slide made of a compression-molded product of a polytetrafluoroethylene resin and a reinforcing member made of a wire mesh, as in the exhaust pipe joint device of the fifth aspect. In this case, the concave toroidal curved surface is a smooth exposed surface of a lubricating sliding layer in which a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh are mixed and integrated.
[0017]
In the exhaust pipe joint device of the fourth or fifth aspect, the convex spherical surface may be provided at the pipe end of the downstream exhaust pipe, and the annular seal may be provided at the pipe end of the upstream exhaust pipe. Preferably, as in the exhaust pipe coupling device according to the sixth aspect of the present invention, the convex spherical surface is provided at the pipe end of the upstream exhaust pipe, and the annular seal body is provided at the pipe end of the downstream exhaust pipe.
[0018]
In the present invention, the annular seal body is preferably a heat-resistant material mainly containing expanded graphite, such as the exhaust pipe joint device of the seventh embodiment, and a heat-resistant material in which the heat-resistant material is arranged in the gap. It is made of a compression-molded product with a reinforcing material made of a wire mesh which is mixed and integrated.
[0019]
Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
In an exhaust pipe joint device 1 shown in FIG. 1, an upstream exhaust pipe 2 and a downstream exhaust pipe 3 are disposed so as to face each other with a gap between their end surfaces 4 and 5, and the upstream exhaust pipe 2 and the downstream exhaust pipe 3 Of the exhaust pipe 3, a flange member 8 having a toroidal convex curved surface 7 is attached to a pipe end 6 of the upstream exhaust pipe 2 connected to the manifold of the automobile engine. A flange member 11 having a conical concave surface 10 is attached to a pipe end portion 9 of the downstream exhaust pipe 3 arranged on the atmosphere side with respect to the side exhaust pipe 3. The flange members 8 and 11 are axially moved closer to each other by a pair of elastic means 17 so as to elastically press the toroidal convex curved surface 7 against the concave spherical surface 15. It is elastically biased.
[0021]
The flange member 8 has, in addition to the toroidal convex curved surface 7, an inner peripheral surface 32 that defines a through hole 31 that communicates between the inside of the tube end 6 and the inside of the tube end 9, and the toroidal convex curved surface 7 is provided. A flange base 33 and a flange 35 formed integrally with the flange base 33 and having a pair of through holes 34 are provided. The flange base 33 is fixed to the pipe end 6 by welding or the like at the flange base 33. Installed.
[0022]
The toroidal convex curved surface 7, which is provided on the pipe end portion 6 of the upstream exhaust pipe 2 via the flange member 8 and slidably contacts the concave spherical surface 15, exhausts the downstream exhaust gas from the curvature center O1 of the concave spherical surface 15. The center of a position 36 on the axis X, which is separated by a given distance δL1 on the side of the tube 3, and has a radius of curvature Δr1 located in a plane perpendicular to the axial direction (a plane perpendicular to the plane of FIG. 1). The circle has a center of curvature O2 and has a radius of curvature r smaller than the radius of curvature R of the concave spherical surface 15.
[0023]
The toroidal convex curved surface 7 is an extension of a line connecting the centers of curvature O1 and O2 when there is no relative angular displacement (oscillation) in the shear direction between the upstream exhaust pipe 2 and the downstream exhaust pipe 3. Is in surface contact with the concave spherical surface 15 with the position 37 substantially at the center.
[0024]
The flange member 11 further includes, in addition to the conical concave surface 10, a flange base 42 having an annular flat inner surface 41 which is connected to the conical concave surface 10 and is substantially perpendicular to the axial direction. And a flange 44 having a pair of through holes 43, and is fixed to the pipe end 9 at the flange base 42 by welding or the like.
[0025]
An annular seal body 16 provided at the pipe end 9 of the downstream side exhaust pipe 3 via a flange member 11 and having a concave spherical surface 15 is formed by a heat-resistant material mainly containing expanded graphite and a heat-resistant material. A compression molded product of a reinforcing material made of a wire mesh mixed and integrated with a heat resistant material, and a reinforcing material made of a polytetrafluoroethylene resin and a wire mesh on the inner surface side having the concave spherical surface 15. And the concave spherical surface 15 is formed from a smooth exposed surface of the lubricating slide layer 51 in which the polytetrafluoroethylene resin and the reinforcing material made of wire mesh are mixed and integrated. Has become.
[0026]
The annular seal body 16 has a conical outer surface 52 corresponding to the conical concave surface 10 and has a surface substantially orthogonal to the axial direction, and has an annular flat surface abutting on the annular flat inner surface 41. It has an end surface 53, and is mounted in contact with the conical concave surface 10 and the annular flat inner surface 41 of the flange member 11 with the conical outer surface 52 and the annular flat end surface 53.
[0027]
The elastic means 17 provided between the pipe ends 6 and 9 of both the exhaust pipes 2 and 3 are provided with a pair of bolts 61 each having one end passing through each through hole 34 of the flange 35 and one end of each bolt 61. A toroidal convex curved surface includes a screwed nut 62 and a pair of coil springs 64 surrounding each bolt 61 and disposed between the head 63 and the flange portion 44 of each bolt 61. 7 generates an elastic force for ensuring slidable contact with the concave spherical surface 15.
[0028]
In the exhaust pipe joint device 1 described above, the relative angular displacement (swing) in the shear direction and the relative rotation (twist) in the torsional direction generated between the upstream exhaust pipe 2 and the downstream exhaust pipe 3 are caused by the lubrication slide layer 51. The relative sliding between the concave spherical surface 15 of the annular seal body 16 which is the exposed surface and the toroidal convex curved surface 7 of the flange member 8 is allowed.
[0029]
In the exhaust pipe coupling device 1, since the toroidal convex curved surface 7 is slidably contacted with the concave spherical surface 15 of the annular seal body 16, the mutual sliding surface is limited, and as a result, the exhaust pipe coupling device 1 is connected to the manifold. Even when the force in the torsional direction and the shearing direction is input to the upstream exhaust pipe 2 that is performed, the probability of occurrence of a stick-slip or the like is reduced, and abnormal noise caused by the stick-slip or the like can be substantially generated. In addition, since the toroidal convex curved surface 7 is wrapped by the concave spherical surface 15 of the annular seal body 16, the flange member 8 can be restrained with respect to the axial position and large swinging without giving the driver any discomfort. As a result, the distal end of the flange member 8 can be prevented from being excessively fitted into the annular seal body 16, and the flange member 8 can be prevented from separating from the annular seal body 16, To, the can so as not to cause positional displacement of the flange member 8 may be so as not to cause a gap on the sliding surface between the toroidal convex surface 7 and the concave spherical surface 15.
[0030]
Further, in the exhaust pipe coupling device 1, since the annular seal body 16 is attached to the conical concave surface 10 of the flange member 11, the annular seal body 16 and the outer peripheral surface of the pipe end 6 of the upstream exhaust pipe 2 are connected. As a result, there is no sliding between the outer exhaust pipe 3 and the outer peripheral surface of the pipe end 9 of the downstream exhaust pipe 3, so that no stick-slip occurs here, and thus the upstream exhaust pipe 2 connected to the manifold is not provided. Even when a force in the torsional direction is input to the device, no abnormal sound due to stick-slip or the like is generated.
[0031]
Further, in the exhaust pipe joint device 1, since the annular flat end face 53 of the annular seal body 16 is in contact with the annular flat inner surface 41 of the flange member 11, the axial movement of the annular seal body 16 by the elastic means 17 is prevented. As a result, the position of the annular seal body 16 does not shift in the axial direction with respect to the flange member 11 due to the elastic force of the elastic means 17.
[0032]
By the way, in the exhaust pipe joint device 1 described above, the flange member 8 has the toroidal convex curved surface 7 and the annular seal body 16 has the concave spherical surface 15. As shown in FIG. 2, the flange member 8 may be configured to have the convex spherical surface 71, while the annular seal body 16 may be configured to have the toroidal concave curved surface 72.
[0033]
That is, in the exhaust pipe coupling device 1 shown in FIG. 2, the flange member 8 having the convex spherical surface 71 is attached to the pipe end 6 of the upstream exhaust pipe 2, and the pipe end of the downstream exhaust pipe 3 is provided. An annular seal body 16 having a toroidal concave curved surface 72 is mounted on the conical concave surface 10 of the flange member 11 attached to the flange member 9.
[0034]
The convex spherical surface 71 provided on the pipe end 6 of the upstream side exhaust pipe 2 via the flange member 8 is elastically pressed against the toroidal concave curved surface 72 by the pair of elastic means 17 and slides on the toroidal concave curved surface 72. The toroidal concave surface 72 of the annular seal body 16 provided at the pipe end portion 9 of the downstream exhaust pipe 3 via the flange member 11 is freely contacting with the upstream exhaust pipe 3 from the curvature center O3 of the convex spherical surface 71. A circle having a radius of curvature Δr2 centered on a position 75 on the axis X separated by a given distance δL2 in two directions and located in a plane orthogonal to the axial direction (a plane orthogonal to the paper of FIG. 2). Is a center of curvature O4 and has a radius of curvature R that is larger than the radius of curvature r of the convex spherical surface 71. In this example, too, a heat-resistant material mainly containing expanded graphite and this heat-resistant material It is arranged and mixed with heat resistant material The annular seal body 16 made of a compression molded product of a reinforcing material made of a wire mesh has a lubricating sliding layer 76 made of a compression molded product of a reinforcing material made of a polytetrafluoroethylene resin and a wire mesh on the toroidal concave curved surface 72 side. In addition, the toroidal concave surface 72 of the lubricating sliding layer 76, which is a smooth exposed surface, has a curvature when no relative angular displacement (oscillation) in the shear direction occurs between the upstream exhaust pipe 2 and the downstream exhaust pipe 3. The surface 77 is in surface contact with the convex spherical surface 71 with the position 77 on the extension of the line connecting the center O4 and the center of curvature O3 substantially at the center.
[0035]
In the exhaust pipe joint device 1 shown in FIG. 2, similarly to the exhaust pipe joint device 1 shown in FIG. 1, relative angular displacement (oscillation) and torsion in the shear direction generated between the upstream exhaust pipe 2 and the downstream exhaust pipe 3. The relative rotation (torsion) in the direction is allowed by relative sliding between the convex spherical surface 71 of the flange member 8 and the toroidal concave curved surface 72 of the annular seal body 16 which is the exposed surface of the lubricating sliding layer 76.
[0036]
In the exhaust pipe joint device 1 shown in FIG. 2, since the convex spherical surface 71 is slidably contacted with the toroidal concave curved surface 72 of the annular seal body 16, the mutual sliding surface is limited. Even when a force in a torsional direction and a shearing direction is input to the upstream exhaust pipe 2 connected to the manifold, the probability of occurrence of stick-slip or the like is reduced, and abnormal noise caused by stick-slip or the like is substantially reduced. The flange member 8 does not cause any discomfort, and the convex spherical surface 71 of the flange member 8 is wrapped by the toroidal concave curved surface 72 of the annular seal body 16. The position and the large swing can be restrained, and the tip of the flange member 8 can be prevented from being excessively fitted into the annular seal body 16. Can be prevented from separating from and Thus, the can so as not to cause positional displacement of the flange member 8 may be so as not to cause a gap on the sliding surface between the convex spherical surface 71 and the toroidal concave surface 72.
[0037]
Further, also in the exhaust pipe coupling device 1 shown in FIG. 2, since the annular seal body 16 is mounted on the conical concave surface 10 of the flange member 11, the annular seal body 16 and the pipe end 6 of the upstream exhaust pipe 2 are formed. As a result, there is no sliding between the outer peripheral surface and the outer peripheral surface of the pipe end 9 of the downstream side exhaust pipe 3, so that no stick-slip occurs here, and thus the upstream connected to the manifold. Even when a force in the torsional direction is input to the side exhaust pipe 2, abnormal noise due to stick-slip or the like is not generated, and the annular flat inner surface 41 of the flange member 11 Since the end face 53 is in contact, the axial movement of the annular seal body 16 by the elastic means 17 can be reliably prevented, and the position of the annular seal body 16 is adjusted by the elastic force of the elastic means 17 with respect to the flange member 11. No longer be shifted in the direction.
[0038]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even when the force of a torsion direction and a shearing direction is input into the exhaust pipe connected to the manifold, it does not generate an abnormal noise due to stick-slip or the like, and discomforts the driver. It is possible to provide an exhaust pipe joint device which does not give any displacement and which does not cause displacement of constituent members and no gap between sliding surfaces.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a preferred example of an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of another preferred example of the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust pipe coupling device 2 Upstream exhaust pipe 3 Downstream exhaust pipe 4, 5 End face 6, 9 Pipe end 8, 11 Flange member 10 Conical concave surface 15 Concave spherical surface 16 Annular seal body 17 Elastic means

Claims

The upstream exhaust pipe and the downstream exhaust pipe are disposed so as to face each other with a gap at each end face, and a concave spherical surface is formed at a pipe end of one of the upstream exhaust pipe and the downstream exhaust pipe. An annular seal body having: is provided, and the pipe end of the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe is slidably contacted with the concave spherical surface, and one of the ends from the center of curvature of the concave spherical surface. The center of curvature is a circle centered on a position on the axial center separated by a given distance on the exhaust pipe direction side and located in a plane orthogonal to the axial direction, and the radius of curvature R of the concave spherical surface is An exhaust pipe joint device provided with a toroidal convex curved surface having a small radius of curvature r, and elastic pressing means for elastically pressing the toroidal convex curved surface to a concave spherical surface between pipe ends of both exhaust pipes.

The annular seal body has a lubricating sliding layer made of a compression molded product of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh, and the concave spherical surface has a mixture of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh. 2. The exhaust pipe joint device according to claim 1, comprising a smooth exposed surface of the integrated lubricating slide layer.

The exhaust pipe joint device according to claim 1 or 2, wherein the toroidal convex curved surface is provided on the upstream exhaust pipe, and the annular seal body is provided on the downstream exhaust pipe.

The upstream exhaust pipe and the downstream exhaust pipe are arranged facing each other with a gap left at each end face, and a convex spherical surface is formed on a pipe end of one of the upstream exhaust pipe and the downstream exhaust pipe. And slidably contact the convex spherical surface with the end of the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe, and from the center of curvature of the convex spherical face to one exhaust pipe direction side. A circle centered on a position on the axis center separated by a given distance and having a center of curvature on a circle located in a plane orthogonal to the axial direction and having a large radius of curvature with respect to the radius of curvature r of the convex spherical surface An exhaust pipe joint device comprising: an annular seal having a toroidal concave curved surface of R; and elastic pressing means for elastically pressing a convex spherical surface to the toroidal concave curved surface between pipe ends of both exhaust pipes.

The annular seal body has a lubricating sliding layer made of a compression molded product of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh, and the toroidal concave curved surface has a reinforcing material made of a polytetrafluoroethylene resin and a wire mesh. The exhaust pipe joint device according to claim 4, comprising a smooth exposed surface of the lubricating slip layer which is mixed and integrated.

The exhaust pipe joint device according to claim 4 or 5, wherein the convex spherical surface is provided on the upstream exhaust pipe, and the annular seal body is provided on the downstream exhaust pipe.

2. A compression molded product of a heat-resistant material mainly containing expanded graphite, and a reinforcing material made of a wire mesh which is arranged in a gap and is integrally mixed with the heat-resistant material. The exhaust pipe joint device according to any one of claims 1 to 6.

An annular seal body for use in the exhaust pipe coupling device according to claim 1.