JP4144253B2

JP4144253B2 - Exhaust pipe fitting device

Info

Publication number: JP4144253B2
Application number: JP2002146798A
Authority: JP
Inventors: 良和坂入; 講平黒瀬
Original assignee: Oiles Corp
Current assignee: Oiles Corp
Priority date: 2002-05-21
Filing date: 2002-05-21
Publication date: 2008-09-03
Anticipated expiration: 2022-05-21
Also published as: JP2003343262A

Description

【０００１】
【発明の属する技術分野】
本発明は、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がそれぞれの端面で隙間を残して相対峙して配置されており、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は、凸球面状外面を有する第一のフランジ部材が取り付けられており、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は、凹面状内面を有する第二のフランジ部材が取り付けられており、凹面状内面には、凸球面状外面の少なくとも二部位で摺動自在に接触するように、少なくとも二つの円錐状内面を有した環状シール体が装着されており、第一及び第二のフランジ部材とが、弾性手段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ことを特徴とする。
【０００９】
第一の態様の排気管継手装置によれば、環状シール体が少なくとも二つの円錐状内面を有し、しかも、この少なくとも二つの円錐状内面を介して第一のフランジ部材の凸球面状外面の少なくとも二部位で摺動自在に接触するようになっているために、少なくとも二つの円錐状内面のうちで軸方向に対して大きな傾斜をもった円錐状内面で、第一のフランジ部材の凸球面状外面からの軸方向の弾性押圧力を受けとめて第一のフランジ部材を軸方向の位置に関して拘束できて、第一のフランジ部材の先端部が過度に環状シール体に嵌入されることを防止できると共に、二つの円錐状内面のうちで軸方向に対して小さい傾斜をもった円錐状内面で、第一のフランジ部材の先端部を包み込むようにして第一のフランジ部材を剪断方向に関して拘束できて、第一のフランジ部材が環状シール体から離反することを防止でき、而して、第一のフランジ部材と環状シール体との間の軸方向の力に起因した相互の位置ずれ及び第一のフランジ部材と環状シール体との間に剪断方向の力に起因した隙間が夫々生じないようにできる。
【００１０】
また第一の態様の排気管継手装置によれば、環状シール体が第二のフランジ部材の凹面状内面に装着されているために、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発生させることがない。
【００１１】
第一の態様の排気管継手装置において、凸球面状外面と円錐状内面とが摺動自在に接触する少なくとも二部位の夫々は、線状である必要はなく、面状、即ち帯状であってもよい。
【００１２】
本発明において環状シール体は、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、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になった金網からなる補強材との圧縮成形物からなる。
【００１３】
本発明において環状シール体は、好ましい例ではその第三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、少なくとも二つの円錐状内面は、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。
【００１４】
本発明において、好ましい例ではその第四の態様の排気管継手装置のように、少なくとも二つの円錐状内面のうちの一方の円錐状内面は、軸方向に対して４５゜以上の角度を有しており、少なくとも二つの円錐状内面のうちの他方の円錐状内面は、軸方向に対して４５゜以下の角度を有しており、更に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、少なくとも二つの円錐状内面のうちの一方の円錐状内面は、軸方向に対して６０゜以上の角度を有しており、少なくとも二つの円錐状内面のうちの他方の円錐状内面は、軸方向に対して３０゜以下の角度を有している。
【００１５】
本発明の第六の態様の排気管継手装置では、上記のいずれかの態様の排気管継手装置において、環状シール体は、環状シール体の少なくとも二つの円錐状内面に対応して少なくとも二つの円錐状外面を有しており、第二のフランジ部材の凹面状内面は、環状シール体の少なくとも二つの円錐状外面に相補的な形状を有する二つの円錐状内面を具備しており、環状シール体は、その二つの円錐状外面で第二のフランジ部材の凹面状内面の対応の二つの円錐状内面に装着されている。
【００１６】
第六の態様の排気管継手装置によれば、環状シール体がその二つの円錐状外面で第二のフランジ部材の凹面状内面の対応の二つの円錐状内面に装着されているために、環状シール体の第二のフランジ部材に対する位置を確実に保持でき、第二のフランジ部材に対して環状シール体が剪断方向に関して位置ずれを起こすような事態を避けることができる。
【００１７】
なお、本発明の第七の態様の排気管継手装置のように、環状シール体が第一のフランジ部材の凸球面状外面に対応した形状の凸球面状外面を有し、第二のフランジ部材の凹面状内面が環状シール体の凸球面状外面に相補的な形状を有する凹球面状内を具備し、環状シール体がその凸球面状外面で第二のフランジ部材の凹球面状内面に装着されていてもよい。
【００１８】
本発明では、第一のフランジ部材を下流側排気管の管端部に、第二のフランジ部材を上流側排気管の管端部に夫々取り付けてもよいのであるが、好ましくは本発明の第八の態様の排気管継手装置のように、第一のフランジ部材は上流側排気管の管端部に、第二のフランジ部材は下流側排気管の管端部に夫々取り付けられている。
【００１９】
本発明の第九の態様の排気管継手装置では、上記のいずれかの態様の排気管継手装置において、第二のフランジ部材は、凹面状内面に連接すると共に、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を更に有しており、環状シール体は、軸方向に対して実質的に直交する面からなると共に、環状平坦内面に当接する環状平坦端面を有している。
【００２０】
第九の態様の排気管継手装置のように、第二のフランジ部材の環状平坦内面に環状シール体の環状平坦端面が当接していると、弾性手段による環状シール体の軸方向の移動を確実に阻止でき、環状シール体の位置が第二のフランジ部材に対して弾性手段による弾性力により軸方向にずれることがなくなる。
【００２１】
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、本発明はこれら実施例には何等限定されないのである。
【００２２】
【発明の実施の形態】
図１に示す排気管継手装置１において、上流側排気管２と下流側排気管３とがそれぞれの端面４及び５で隙間を残して相対峙して配置されており、上流側排気管２と下流側排気管３とのうちの一方の排気管、本例では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、凸球面状外面７を有するフランジ部材８が取り付けられており、他方の排気管である大気側に配された下流側排気管３の管端部９には、凹面状内面１０を有するフランジ部材１１が取り付けられており、凹面状内面１０には、凸球面状外面７の二部位１２及び１３で摺動自在に接触するように、二つの円錐状内面１４及び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、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。
【００２３】
フランジ部材８は、凸球面状外面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を有したフランジ基部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。
【００２４】
フランジ部材１１は、凹面状内面１０に加えて、凹面状内面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】
凹面状内面１０は、環状シール体１６の二つの円錐状外面５１及び５２に相補的な形状を有する二つの円錐状内面５３及び５４を具備している。
【００２６】
環状シール体１６は、特に図２及び図３にそれ自体を示すように、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になった金網からなる補強材との圧縮成形物からなって、円錐状内面１４及び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６１を有しており、二つの円錐状内面１４及び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６１の平滑な露出面からなっている。
【００２７】
また、環状シール体１６は、円錐状内面１４及び１５並びに円錐状内面１４及び１５に対応して少なくとも二つの円錐状外面５１及び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６２を有しており、円錐状外面５１及び５２でフランジ部材１１の凹面状内面１０の対応の二つの円錐状内面５３及び５４に接触して装着されている。
【００２８】
円錐状内面１４は、軸方向に対して３０゜以下の角度θ１、本例では実質的にθ１＝１５°を有しており、円錐状内面１４に連接された円錐状内面１５は、軸方向に対して６０゜以上の角度θ２、本例では実質的にθ２＝７５°を有している。
【００２９】
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７１と、各ボルト７１の一端部に螺着されたナット７２と、各ボルト７１を囲繞していると共に各ボルト７１の頭部７３とフランジ部４４との間に配された一対のコイルばね７４とを具備しており、凸球面状外面７の二部位１２及び１３への円錐状内面１４及び１５の摺動自在な接触を確保する弾性力を発生している。
【００３０】
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６１の露出面である環状シール体１６の円錐状内面１４及び１５とフランジ部材８の凸球面状外面７の二部位１２及び１３との相対的な摺動で許容される。
【００３１】
そして、排気管継手装置１においては、環状シール体１６が円錐状内面１４及び１５を有し、しかも、円錐状内面１４及び１５を介してフランジ部材８の凸球面状外面７の二部位１２及び１３で摺動自在に接触するようになっているために、軸方向に対して大きな傾斜（傾斜角θ２＝７５°）をもった円錐状内面１５で、フランジ部材８の凸球面状外面７からの軸方向の弾性押圧力を受けとめてフランジ部材８を軸方向の位置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と共に、軸方向に対して小さい傾斜（傾斜角θ１＝１５°）をもった円錐状内面１４で、フランジ部材８の先端部を包み込むようにしてフランジ部材８を大きな揺動に関して拘束できて、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と環状シール体１６との間の軸方向の力に起因した相互の位置ずれ及びフランジ部材８と環状シール体１６との間に剪断方向の力に起因した隙間が夫々生じないようにできる。
【００３２】
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の凹面状内面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。
【００３３】
また、排気管継手装置１においては、環状シール体１６がその二つの円錐状外面５１及び５２でフランジ部材１１の凹面状内面１０の対応の二つの円錐状内面５３及び５４に装着されているために、環状シール体１６のフランジ部材１１に対する位置を確実に保持でき、フランジ部材１１に対して環状シール体１６が位置ずれを起こすような事態を避けることができる上に、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６２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。
【００３４】
ところで、上記の排気管継手装置１においては、環状シール体１６をその二つの円錐状外面５１及び５２でフランジ部材１１の凹面状内面１０の対応の二つの円錐状内面５３及び５４に装着したが、これに代えて、図４に示すように、フランジ部材８の凸球面状外面７に対応した形状の凸球面状外面８１を有して環状シール体１６を構成し、環状シール体１６の凸球面状外面８１に相補的な形状を有する凹球面状内面８２をフランジ基部４２に具備してフランジ部材１１の凹面状内面１０を構成し、環状シール体１６をその凸球面状外面８１でフランジ部材１１の凹球面状内面８２に接触させて装着してもよい。
【００３５】
図４に示す排気管継手装置１でも、フランジ部材８と環状シール体１６との間に位置ずれ及び隙間が生じないようにできる上に、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。
【００３６】
【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、位置ずれ及び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】図１に示す環状シール体の説明図である。
【図３】図１に示す環状シール体の斜視図である。
【図４】本発明の実施の形態の好ましい他の例の一部の縦断面図である。
【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
７凸球面状外面
８フランジ部材
１０凹面状内面
１１フランジ部材
１２、１３部位
１４、１５円錐状内面
１６環状シール体
１７弾性手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust pipe joint device for an automobile.
[0002]
[Problems to be solved by the invention]
The exhaust gas of an automobile engine is led from an engine to an exhaust pipe disposed on a body frame or the like and discharged into the atmosphere. This exhaust pipe is subjected to bending stress due to torque reaction force and inertial force of the engine. Therefore, there is a risk that the vibration of the engine is brought into the passenger compartment through the exhaust pipe suspension frame or causes noise, and also causes problems such as fatigue breakage of the exhaust pipe. In order to solve such a problem, means such as disposing an exhaust pipe joint device having a spherical pipe joint (annular seal body) to absorb stress is taken.
[0003]
In many cases, the spherical pipe joint is slidably in contact with the concave spherical inner surface of the flange member fixed to the end of the downstream exhaust pipe at the convex spherical outer surface, and the inner peripheral surface thereof. It is used by being fitted on the outer peripheral surface of the pipe end portion 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 horizontally mounted engine (FF vehicle), an exhaust pipe joint device is generally arranged in the vicinity of the engine manifold. In such an FF vehicle, the bending stress in the manifold is caused by the vertical engine. In addition to the force in the shearing direction (in the direction perpendicular to the pipe axis of the exhaust pipe), the exhaust pipe connected to the manifold is particularly torsional (centered around the pipe axis of the exhaust pipe). The force in the rotation direction) is greatly applied, and this force is also input to the exhaust pipe joint device.
[0005]
When a large torsional force is applied to the exhaust pipe joint device, stick slip occurs between the inner peripheral surface of the spherical pipe joint fitted to each other and the outer peripheral surface of the pipe end of the upstream exhaust pipe. An abnormal noise is generated, which causes discomfort to the driver and passenger of the car.
[0006]
Various techniques have been proposed to solve this problem, but one proposed technique is to replace the spherical pipe joint on the outer peripheral surface of the pipe end of the upstream exhaust pipe on its inner peripheral surface. In addition, there is one that is attached to the flange member on the outer peripheral surface thereof, thereby preventing the generation of abnormal noise due to stick slip. It is likely to occur and is not always satisfactory.
[0007]
The present invention has been made in view of the above-described points, and the object of the present invention is due to stick slip or the like even when forces in the twisting direction and shearing direction are input to the exhaust pipe connected to the manifold. It is an object of the present invention to provide an exhaust pipe joint device that does not generate an abnormal sound and does not give a driver unpleasant feeling and that does not cause a positional shift and a gap between components.
[0008]
[Means for Solving the Problems]
In the exhaust pipe joint device of the first aspect of the present invention, the upstream side exhaust pipe and the downstream side exhaust pipe are arranged so as to face each other leaving a gap at each end face, and the upstream side exhaust pipe and the downstream side exhaust pipe are arranged. A first flange member having a convex spherical outer surface is attached to a pipe end of one of the exhaust pipes, and the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe A second flange member having a concave inner surface is attached to the pipe end of the tube, and at least two of the concave inner surface are slidably contacted with at least two portions of the convex spherical outer surface. An annular seal body having a conical inner surface is mounted, and the first and second flange members are elastically biased in the axial direction so as to approach each other by elastic means. .
[0009]
According to the exhaust pipe coupling device of the first aspect, the annular seal body has at least two conical inner surfaces, and the convex spherical outer surface of the first flange member is interposed through the at least two conical inner surfaces. A convex spherical surface of the first flange member having a conical inner surface having a large inclination with respect to the axial direction among at least two conical inner surfaces because the slidable contact is made in at least two parts. The first flange member can be constrained with respect to the axial position by receiving the axial elastic pressing force from the outer surface, and the tip portion of the first flange member can be prevented from being excessively fitted into the annular seal body. In addition, the conical inner surface having a small inclination with respect to the axial direction of the two conical inner surfaces can constrain the first flange member with respect to the shearing direction so as to wrap the tip of the first flange member. , The first flange member can be prevented from separating from the annular seal body, and thus the mutual displacement and the first difference caused by the axial force between the first flange member and the annular seal body can be prevented. It is possible to prevent gaps caused by the force in the shearing direction from occurring between the flange member and the annular seal body.
[0010]
Further, according to the exhaust pipe joint device of the first aspect, since the annular seal body is mounted on the concave inner surface of the second flange member, the annular seal body and the outer peripheral surface of the pipe end of the exhaust pipe As a result, there is no occurrence of stick-slip here, and even when force in the torsional direction is input to the exhaust pipe connected to the manifold, abnormalities caused by stick-slip etc. Does not generate sound.
[0011]
In the exhaust pipe joint device according to the first aspect, each of at least two portions where the convex spherical outer surface and the conical inner surface are slidably contacted does not need to be linear, but is planar, that is, belt-shaped. Also good.
[0012]
In the present invention, the annular seal body is preferably a heat-resistant material mainly containing expanded graphite, and the heat-resistant material is disposed in the gap and is heat-resistant as in the exhaust pipe joint device according to the second embodiment. It consists of a compression-molded product with a reinforcing material consisting of a mixed and integrated wire mesh.
[0013]
In the present invention, the annular seal body has a lubricating slip layer made of a compression molded product of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh, like the exhaust pipe joint device of the third aspect in a preferred example. Here, the at least two conical inner surfaces are formed of a smooth exposed surface of the lubricating slip layer in which a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh are mixed and integrated.
[0014]
In the present invention, in a preferred example, the conical inner surface of at least two conical inner surfaces has an angle of 45 ° or more with respect to the axial direction as in the exhaust pipe joint device of the fourth aspect. The other conical inner surface of the at least two conical inner surfaces has an angle of 45 ° or less with respect to the axial direction. In a more preferable example, the exhaust pipe joint device of the fifth aspect Thus, one conical inner surface of the at least two conical inner surfaces has an angle of 60 ° or more with respect to the axial direction, and the other conical inner surface of the at least two conical inner surfaces is And an angle of 30 ° or less with respect to the axial direction.
[0015]
In the exhaust pipe joint device according to the sixth aspect of the present invention, in the exhaust pipe joint device according to any one of the above aspects, the annular seal body corresponds to at least two conical inner surfaces of the annular seal body. The concave inner surface of the second flange member includes two conical inner surfaces having a shape complementary to at least two conical outer surfaces of the annular seal member. Are attached to the corresponding two conical inner surfaces of the concave inner surface of the second flange member at their two conical outer surfaces.
[0016]
According to the exhaust pipe joint device of the sixth aspect, since the annular seal body is mounted on the two conical inner surfaces of the concave inner surface of the second flange member at its two conical outer surfaces, The position of the seal body with respect to the second flange member can be reliably held, and a situation in which the annular seal body is displaced with respect to the shear direction with respect to the second flange member can be avoided.
[0017]
As in the exhaust pipe joint device of the seventh aspect of the present invention, the annular seal body has a convex spherical outer surface corresponding to the convex spherical outer surface of the first flange member, and the second flange member The concave inner surface has a concave spherical inner shape complementary to the convex spherical outer surface of the annular seal body, and the annular seal body is mounted on the concave spherical inner surface of the second flange member with the convex spherical outer surface. May be.
[0018]
In the present invention, the first flange member may be attached to the pipe end of the downstream exhaust pipe, and the second flange member may be attached to the pipe end of the upstream exhaust pipe. As in the exhaust pipe joint device according to the eighth aspect, the first flange member is attached to the pipe end of the upstream exhaust pipe, and the second flange member is attached to the pipe end of the downstream exhaust pipe.
[0019]
In the exhaust pipe joint device according to the ninth aspect of the present invention, in the exhaust pipe joint device according to any one of the above aspects, the second flange member is connected to the concave inner surface and substantially in the axial direction. The annular seal body further includes an annular flat inner surface made of an orthogonal surface, and the annular seal body has an annular flat end surface that abuts against the annular flat inner surface while being substantially orthogonal to the axial direction.
[0020]
If the annular flat end surface of the annular seal body is in contact with the annular flat inner surface of the second flange member as in the exhaust pipe joint device of the ninth aspect, the axial movement of the annular seal body by the elastic means is ensured. Therefore, the position of the annular seal body does not shift in the axial direction with respect to the second flange member due to the elastic force of the elastic means.
[0021]
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.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In the exhaust pipe joint device 1 shown in FIG. 1, the upstream side exhaust pipe 2 and the downstream side exhaust pipe 3 are arranged so as to face each other with a gap between the end faces 4 and 5. A flange member 8 having a convex spherical outer surface 7 is attached to one of the downstream exhaust pipes 3 and, in this example, the pipe end 6 of the upstream exhaust pipe 2 connected to the manifold of the automobile engine. A flange member 11 having a concave inner surface 10 is attached to the pipe end portion 9 of the downstream exhaust pipe 3 arranged on the atmosphere side which is the other exhaust pipe. An annular seal body 16 having two conical inner surfaces 14 and 15 is attached so as to be slidably in contact with the two portions 12 and 13 of the convex spherical outer surface 7, and the flange members 8 and 11 are Axial to approach each other by elastic means 17 It is resiliently biased to.
[0023]
In addition to the convex spherical outer surface 7, the flange member 8 includes a flange base 33 having an inner peripheral surface 32 that defines a through hole 31 that communicates the inside of the pipe end 6 and the inside of the pipe end 9, and the flange base 33. And a flange portion 35 having a pair of through holes 34. The flange base portion 33 is fixedly attached to the pipe end portion 6 by welding or the like.
[0024]
In addition to the concave inner surface 10, the flange member 11 is connected to the concave inner surface 10, and further includes an annular flat inner surface 41 having a surface substantially orthogonal to the axial direction; The flange base portion 42 is formed integrally with the flange base portion 42 and includes a flange portion 44 having a pair of through holes 43. The flange base portion 42 is fixedly attached to the pipe end portion 9 by welding or the like.
[0025]
The concave inner surface 10 includes two conical inner surfaces 53 and 54 having a shape complementary to the two conical outer surfaces 51 and 52 of the annular seal body 16.
[0026]
2 and 3, the annular seal body 16 is mainly composed of a heat-resistant material mainly containing expanded graphite, and the heat-resistant material is arranged in the gap and mixed with the heat-resistant material. A lubricating slip layer 61 made of a compression molded product of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh is formed on the inner surface side having the conical inner surfaces 14 and 15 made of a compression molded product made of a reinforcing material made of a wire mesh. The two conical inner surfaces 14 and 15 are formed of smooth exposed surfaces of the lubricated sliding layer 61 in which a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh are mixed and integrated.
[0027]
Further, the annular seal body 16 has at least two conical outer surfaces 51 and 52 corresponding to the conical inner surfaces 14 and 15 and the conical inner surfaces 14 and 15, and substantially in the axial direction. It has an annular flat end face 62 that is orthogonal to the annular flat inner face 41 and has two conical inner faces 53 and 54 corresponding to the concave inner face 10 of the flange member 11 at the conical outer faces 51 and 52. It is attached in contact with.
[0028]
The conical inner surface 14 has an angle θ1 of 30 ° or less with respect to the axial direction, and in this example, substantially θ1 = 15 °, and the conical inner surface 15 connected to the conical inner surface 14 has an axial direction. The angle θ2 is 60 ° or more, and in this example, substantially θ2 = 75 °.
[0029]
The elastic means 17 surrounds each pair of bolts 71, a pair of bolts 71 having one end passing through each through hole 34 of the flange portion 35, a nut 72 screwed to one end of each bolt 71, and each bolt 71. A pair of coil springs 74 disposed between the head portion 73 of the bolt 71 and the flange portion 44 are provided, and the conical inner surfaces 14 and 15 slide on the two portions 12 and 13 of the convex spherical outer surface 7. An elastic force is generated to ensure a movable contact.
[0030]
In the exhaust pipe joint device 1 described above, the relative angular displacement (oscillation) in the shearing direction and the relative rotation (twisting) in the torsional direction that occur between the upstream exhaust pipe 2 and the downstream exhaust pipe 3 are caused by the lubrication slip layer 61. It is permitted by relative sliding between the conical inner surfaces 14 and 15 of the annular seal body 16 that is the exposed surface and the two portions 12 and 13 of the convex spherical outer surface 7 of the flange member 8.
[0031]
In the exhaust pipe joint device 1, the annular seal body 16 has the conical inner surfaces 14 and 15, and the two portions 12 of the convex spherical outer surface 7 of the flange member 8 and the conical inner surfaces 14 and 15, and 13 is slidably in contact with the conical inner surface 15 having a large inclination (inclination angle θ2 = 75 °) with respect to the axial direction, and from the convex spherical outer surface 7 of the flange member 8. By receiving the elastic pressing force in the axial direction, the flange member 8 can be constrained with respect to the position in the axial direction, so that the tip end portion of the flange member 8 can be prevented from being excessively fitted into the annular seal body 16 and the axial direction can be prevented. With the conical inner surface 14 having a small inclination (inclination angle θ1 = 15 °), the flange member 8 can be restrained with respect to a large swing so as to wrap the front end portion of the flange member 8, and the flange member 8 It is possible to prevent separation from the body 16, and thus, mutual displacement due to the axial force between the flange member 8 and the annular seal body 16 and between the flange member 8 and the annular seal body 16. It is possible to prevent the gaps caused by the forces in the shearing direction from occurring.
[0032]
Further, in the exhaust pipe coupling device 1, the annular seal body 16 is attached to the concave inner surface 10 of the flange member 11, so that the outer peripheral surface of the annular seal body 16 and the pipe end 6 of the upstream side exhaust pipe 2 or As a result of the absence of sliding with the outer peripheral surface of the pipe end portion 9 of the downstream side exhaust pipe 3, there is no occurrence of stick-slip here, and thus the upstream side exhaust pipe 2 connected to the manifold is twisted. Even when a directional force is input, no abnormal sound due to stick-slip or the like is generated.
[0033]
Further, in the exhaust pipe coupling device 1, the annular seal body 16 is mounted on the corresponding two conical inner surfaces 53 and 54 of the concave inner surface 10 of the flange member 11 by the two conical outer surfaces 51 and 52. In addition, the position of the annular seal body 16 relative to the flange member 11 can be reliably held, and a situation in which the annular seal body 16 is displaced relative to the flange member 11 can be avoided. Since the annular flat end surface 62 of the annular seal body 16 is in contact with the inner surface 41, 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 fixed to the flange member 11. In contrast, the elastic means 17 does not shift in the axial direction due to the elastic force.
[0034]
By the way, in the exhaust pipe joint device 1 described above, the annular seal body 16 is mounted on the two conical inner surfaces 53 and 54 corresponding to the concave inner surface 10 of the flange member 11 by the two conical outer surfaces 51 and 52. Instead, as shown in FIG. 4, the annular seal body 16 is configured by having a convex spherical outer surface 81 having a shape corresponding to the convex spherical outer surface 7 of the flange member 8. A concave spherical inner surface 82 having a shape complementary to the spherical outer surface 81 is provided in the flange base portion 42 to constitute the concave inner surface 10 of the flange member 11, and the annular seal body 16 is flanged by the convex spherical outer surface 81. 11 may be mounted in contact with the concave spherical inner surface 82.
[0035]
In the exhaust pipe joint device 1 shown in FIG. 4 as well, it is possible to prevent a positional shift and a gap between the flange member 8 and the annular seal body 16, and to the upstream side exhaust pipe 2 connected to the manifold in the torsional direction. Even when force is input, no abnormal sound due to stick-slip or the like is generated.
[0036]
【The invention's effect】
According to the present invention, even when a force in the torsional direction and shearing direction is input to the exhaust pipe connected to the manifold, an abnormal noise caused by stick-slip or the like is not generated, and the driver feels uncomfortable. In addition, it is possible to provide an exhaust pipe joint device that does not give a positional shift and a gap.
[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 an explanatory diagram of the annular seal body shown in FIG.
3 is a perspective view of the annular seal body shown in FIG. 1. FIG.
FIG. 4 is a longitudinal sectional view of a part of another preferred example of an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust pipe coupling apparatus 2 Upstream side exhaust pipe 3 Downstream side exhaust pipe 4, 5 End surface 6, 9 Pipe end part 7 Convex spherical outer surface 8 Flange member 10 Concave inner surface 11 Flange members 12, 13 Sites 14, 15 Conical inner surface 16 annular seal body 17 elastic means

Claims

The upstream side exhaust pipe and the downstream side exhaust pipe are arranged so as to face each other with a gap at each end face, and are arranged at the pipe end of one of the upstream side exhaust pipe and the downstream side exhaust pipe. Is attached with a first flange member having a convex spherical outer surface, and a second end having a concave inner surface at the pipe end of the other exhaust pipe of the upstream exhaust pipe and the downstream exhaust pipe. An annular seal body having at least two conical inner surfaces is attached to the concave inner surface so as to be slidably in contact with at least two portions of the convex spherical outer surface. The exhaust pipe joint device in which the first and second flange members are elastically biased in the axial direction so as to approach each other by elastic means.

The annular seal body is composed of a compression molded product mainly composed of a heat-resistant material containing expanded graphite and a reinforcing material made of a wire mesh in which the heat-resistant material is disposed in the gap and is integrally mixed with the heat-resistant material. An exhaust pipe joint device according to claim 1.

The annular seal body has a lubricating slip layer made of a compression molded product of a polytetrafluoroethylene resin and a reinforcing material made of a wire mesh, and at least two conical inner surfaces are reinforced with a polytetrafluoroethylene resin and a wire mesh. The exhaust pipe joint device according to claim 1 or 2, comprising a smooth exposed surface of a lubricating slip layer in which a material is mixed and integrated.

One conical inner surface of the at least two conical inner surfaces has an angle of 45 ° or more with respect to the axial direction, and the other conical inner surface of the at least two conical inner surfaces is the axial direction. The exhaust pipe joint device according to any one of claims 1 to 3, wherein the exhaust pipe joint device has an angle of 45 ° or less with respect to the angle.

One conical inner surface of the at least two conical inner surfaces has an angle of 60 ° or more with respect to the axial direction, and the other conical inner surface of the at least two conical inner surfaces is the axial direction. The exhaust pipe joint device according to any one of claims 1 to 3, wherein the exhaust pipe joint device has an angle of 30 ° or less with respect to the angle.

The annular seal body has at least two conical outer surfaces corresponding to the at least two conical inner surfaces of the annular seal body, and the concave inner surface of the second flange member is at least two cones of the annular seal body. Two conical inner surfaces having a complementary shape to the outer surface of the ring, and the annular sealing body is formed on the two conical inner surfaces corresponding to the concave inner surface of the second flange member at the two conical outer surfaces. The exhaust pipe joint device according to any one of claims 1 to 5, wherein the exhaust pipe joint device is attached.

The annular seal body has a convex spherical outer surface having a shape corresponding to the convex spherical outer surface of the first flange member, and the concave inner surface of the second flange member is in contact with the convex spherical outer surface of the annular seal body. The concave spherical inner surface having a complementary shape is provided, and the annular seal body is attached to the concave spherical inner surface of the second flange member by the convex spherical outer surface. The exhaust pipe joint device according to one item.

The exhaust according to any one of claims 1 to 7, wherein the first flange member is attached to the pipe end of the upstream exhaust pipe, and the second flange member is attached to the pipe end of the downstream exhaust pipe. Pipe fitting device.

The second flange member is connected to the concave inner surface and further has an annular flat inner surface made of a surface substantially orthogonal to the axial direction, and the annular seal body is substantially connected to the axial direction. The exhaust pipe joint device according to any one of claims 1 to 8, wherein the exhaust pipe joint device has an annular flat end face that comes into contact with the annular flat inner surface.

An annular seal body for use in the exhaust pipe joint device according to any one of claims 1 to 9, wherein the annular seal body has at least two conical inner surfaces.