JP4537842B2

JP4537842B2 - Exhaust pipe joint and manufacturing method thereof

Info

Publication number: JP4537842B2
Application number: JP2004364481A
Authority: JP
Inventors: 政男平; 道貞隈崎
Original assignee: Hirotec Corp
Current assignee: Hirotec Corp
Priority date: 2004-12-16
Filing date: 2004-12-16
Publication date: 2010-09-08
Anticipated expiration: 2024-12-16
Also published as: JP2006170094A

Description

本発明は、Ｖ型エンジンの排気路に設けられる排気管ジョイントと、この排気管ジョイントの製造方法に関する。 The present invention relates to an exhaust pipe joint provided in an exhaust path of a V-type engine and a method for manufacturing the exhaust pipe joint.

図１７はＶ型エンジンの排気管の構成を示す配置図である。図１７に示すように、Ｖ
型エンジンEの排気ガスは、V型エンジンEのシリンダヘッドの排気ポートから、各シリンダより独立した管を集合させるエキゾースト・マニホールド３０と、それに接続された二股排気管３１ａ、３１ｂの少なくとも一方に使用された排気管ジョイント１０と、その下流に配設されたフレキシブルチューブ３３を通り、その下流に接続された排気ガス中の有害成分を化学反応によって無害な成分に変化させる触媒コンバータ３４を通り、排出音を小さくするサブマフラー３５、メーンマフラー３６を経由して、大気に放出される。
前記フレキシブルチューブ３３の目的は、排気ガスの排気効率を向上させてエンジンの出力性能を改善するとともに、排気ガスの温度低下を抑制して触媒コンバータ３４に流入する排気ガスの温度の立ち上がりを早くして触媒を活性化させ、排気ガスの浄化性能を改善することにある。
これに対して、前記排気管ジョイント１０の目的は、二股排気管のV型エンジンＥへの組付け性の向上と、熱による二股排気管相互の伸びを吸収することにあり、それに加えて、エキゾースト・マニホールド３０側の振動のマフラ側への伝達を軽減することにあり、前記フレキシブルチューブ３３の目的と排気管ジョイント１０の目的とは大きく異なる。 FIG. 17 is a layout diagram showing the configuration of the exhaust pipe of the V-type engine. As shown in FIG.
Exhaust gas of type E engine is used for at least one of exhaust manifold 30 that collects independent pipes from each cylinder and bifurcated exhaust pipes 31a and 31b connected from the exhaust port of the cylinder head of type V engine E The exhaust pipe joint 10 and the flexible tube 33 disposed downstream of the exhaust pipe joint 10 pass through the catalytic converter 34 that changes the harmful components in the exhaust gas connected downstream thereof into harmless components by a chemical reaction, and is discharged. The sound is emitted to the atmosphere via the sub muffler 35 and the main muffler 36 that reduce the sound.
The purpose of the flexible tube 33 is to improve the exhaust gas exhaust efficiency and improve engine output performance, and to suppress the temperature drop of the exhaust gas to accelerate the rise of the temperature of the exhaust gas flowing into the catalytic converter 34. The purpose is to activate the catalyst and improve the exhaust gas purification performance.
On the other hand, the purpose of the exhaust pipe joint 10 is to improve the assembly of the bifurcated exhaust pipe to the V-type engine E and absorb the mutual expansion of the bifurcated exhaust pipe due to heat. The purpose of the flexible tube 33 and the purpose of the exhaust pipe joint 10 are greatly different from each other in reducing the transmission of vibrations on the exhaust manifold 30 side to the muffler side.

図１８は従来の自動車排気管用の継手１０１の断面図である。図１８に示すように、並置された一対の排気管１０２、排気管１０３と、相互に連結された一対の枝管１０４、枝管１０５を有した二股排気管１０６のその枝管１０４、枝管１０５とを相互に連結している。前記継手１０１は、排気管１０２に、その排気管１０２に対応して配される二股排気管１０６の一方の枝管１０４を連結する球面継手１０７と、排気管１０３に対応して配される他方の枝管１０５を連結する可撓性の伸縮自在の継手１０８とが設けられている（例えば、特許文献１）。
特開平９−１４４５３４号公報（段落番号０００８〜００１１、図１） FIG. 18 is a sectional view of a conventional joint 101 for an automobile exhaust pipe. As shown in FIG. 18, the branch pipe 104 and the branch pipe of a bifurcated exhaust pipe 106 having a pair of juxtaposed exhaust pipe 102 and exhaust pipe 103 and a pair of branch pipes 104 and branch pipes 105 connected to each other. 105 are connected to each other. The joint 101 includes a spherical joint 107 that connects one branch pipe 104 of a bifurcated exhaust pipe 106 arranged corresponding to the exhaust pipe 102 to the exhaust pipe 102, and the other arranged corresponding to the exhaust pipe 103. And a flexible telescopic joint 108 for connecting the branch pipes 105 to each other (for example, Patent Document 1).
JP-A-9-144534 (paragraph numbers 0008 to 0011, FIG. 1)

しかしながら、V型エンジンEの排気管として使用する場合、マニホールドのフランジ１１０のような同一平面にはならないので２つに分割しなければならず、従来の自動車排気管用の継手１０１では、排気管１０３と枝管１０４とが分割されており、さらに、排気管１０３と枝管１０５とが分割されているため、組み付けに時間がかかるという問題があった。
さらに、このような蛇腹式の伸縮自在な継手１０８の外管のみでは、排気ガスが直接蛇腹に当り、排気抵抗が大きくなって排気効率が悪くなるという問題があった。
また、球面継手１０７は、図１８において紙面に対して直角方向には遥動するが、紙面の平面方向には遥動できないため、動く方向が一方向に限定されるので、当然、取り付け方向も限定されて、組付け作業性が悪いという問題があった。また、伸縮方向には全く対応できないという問題があった。
さらに、排気ガスが漏れないように、球面継手１０７の球面部を一定の力で押圧するため、バネやボルトをセットするためのフランジを設ける必要があり、球面継手１０７の取り付けスペースが大きいという問題があった。
また、球面継手１０７が遥動できる方向に動かして取り付けられた場合、排気管１０４側（球面継手の凹側）の球面１１７に排気ガスが当ることになり、排気抵抗が大きくなって排気効率が悪くなるという問題があった。 However, when it is used as an exhaust pipe of a V-type engine E, it does not have the same plane as the flange 110 of the manifold, so it must be divided into two. In the conventional joint 101 for an automobile exhaust pipe, the exhaust pipe 103 And the branch pipe 104 are divided, and further, the exhaust pipe 103 and the branch pipe 105 are divided, which causes a problem that it takes time to assemble.
Furthermore, with only the outer tube of such a bellows-type telescopic joint 108, there is a problem that exhaust gas directly hits the bellows, increasing the exhaust resistance and reducing the exhaust efficiency.
In addition, the spherical joint 107 swings in a direction perpendicular to the paper surface in FIG. 18 but cannot swing in the plane direction of the paper surface, so that the moving direction is limited to one direction. Limited, there was a problem that the assembly workability was poor. In addition, there is a problem that it cannot cope with the expansion and contraction direction at all.
Further, in order to press the spherical surface of the spherical joint 107 with a constant force so that the exhaust gas does not leak, it is necessary to provide a flange for setting a spring or a bolt, and there is a problem that the mounting space for the spherical joint 107 is large. was there.
Further, when the spherical joint 107 is mounted so as to move in the far direction, the exhaust gas hits the spherical surface 117 on the exhaust pipe 104 side (the concave side of the spherical joint), and the exhaust resistance increases and the exhaust efficiency increases. There was a problem of getting worse.

そこで、本発明は、従来の継手の問題点を解決するために創案されたものであり、組付け作業性がよく、組み付けに時間がかからず、排気ガスが通過する際の排気抵抗が小さくて排気効率が良く、排ガス温度低下抑制効果の向上（触媒の活性化維持）となり、さらに、取り付けスペースが小さい排気管ジョイントと、この排気管ジョイントの製造方法を提供することを課題とする。 Therefore, the present invention was created to solve the problems of conventional joints, has good assembly workability, does not take time for assembly, and has low exhaust resistance when exhaust gas passes through. It is an object of the present invention to provide an exhaust pipe joint that has good exhaust efficiency, improves the exhaust gas temperature decrease suppression effect (maintains activation of the catalyst), and has a small mounting space, and a method for manufacturing the exhaust pipe joint.

請求項１に係る発明は、エンジンの排気路に配設され、外管（１）と内管（２）の２層から構成された排気管ジョイント（１０）であって、前記外管（１）は、一端に開口部（１ａ）が形成され、他端に開口部（１ｄ）が形成され、その中間部には管中心線上に中心点を有する半径（Ｒ）の内球面部（１ｂ）が形成され、その内球面部（１ｂ）の下流側近傍に蛇腹部（１ｃ）が形成され、前記内管（２）は、一端が前記外管（１）の前記内球面部（１ｂ）に内接され、回動可能とする外球面部（２ｂ）を有し、その外球面部（２ｂ）に連続して前記外管（１）の蛇腹部（１ｃ）と所定距離を保って軸方向に沿う流体通路（２ｃ）を形成するとともに、他端の開口部（２ｄ）が、前記外管（１）の他端の開口部（１ｄ）に摺動可能に内接され、前記外管（１）の開口部（１ｄ）の近傍にあり、前記外管（１）と前記内管（２）における径方向の相対距離を一定にするために、前記内管（２）側へ突出する凸状のビード（１ｅ）または外管（１）側へ突出する凸状のビード（２ｅ）を前記外管（１）または前記内管（２）に形成したことを特徴とする。 The invention according to claim 1 is an exhaust pipe joint (10) disposed in an exhaust passage of an engine and composed of two layers of an outer pipe (1) and an inner pipe (2), wherein the outer pipe (1) ), an opening (1a) is formed at one end, opening at the other end (1d) is formed, the inner spherical surface of radius (R) having a center point on the tube centerline in the middle part (1b) There is formed, the bellows portion (1c) is formed in the vicinity of the downstream side of the inner spherical surface portion (1b), said inner tube (2), the inside spherical portion of the outer tube end (1) to (1b) It has an outer spherical surface portion (2b) that is inscribed and can be rotated, and is continuous with the outer spherical surface portion (2b) to maintain a predetermined distance from the bellows portion (1c) of the outer tube (1) in the axial direction. to form a fluid passage (2c) along the openings of the other end (2d), is slidably inscribed in the opening of the other end of the outer tube (1) (1d), In the vicinity of the opening (1d) of the outer tube (1), the inner tube (2) side is used to make the radial relative distance between the outer tube (1) and the inner tube (2) constant. A convex bead (1e) protruding toward the outer tube (1) or a convex bead (2e) protruding toward the outer tube (1) is formed on the outer tube (1) or the inner tube (2) .

請求項２に係る発明は、エンジンの排気路に配設され、外管（１）と内管（２）の２層から構成された排気管ジョイント（１０）であって、前記外管（１）は、一端に開口部（１ａ）が形成され、他端に開口部（１ｄ）が形成され、その中間部には管中心線上に中心点を有する半径（Ｒ）の内球面部（１ｂ）が形成され、その内球面部（１ｂ）の下流側近傍に蛇腹部（１ｃ）が形成され、前記内管（２）は、一端が前記外管（１）の前記内球面部（１ｂ）に内接されて、回動可能とする外球面部（２ｂ）を有し、その外球面部（２ｂ）に連続して前記外管（１）の蛇腹部（１ｃ）と所定距離を保って軸方向に沿う流体通路（２ｃ）を形成するとともに、他端の開口部（２ｄ）が、前記外管（１）の他端の開口部（１ｄ）に摺動可能に内接され、前記外管（１）の開口部（１ｄ）あるいは前記内管（２）の開口部（２ｄ）の近傍に、リング状のワイヤーメッシュ（８）を装着したことを特徴とする。 The invention according to claim 2 is an exhaust pipe joint (10) disposed in an exhaust passage of an engine and composed of two layers of an outer pipe (1) and an inner pipe (2), wherein the outer pipe (1) ) Has an opening (1a) at one end, an opening (1d) at the other end, and an inner spherical portion (1b) of radius (R) having a center point on the tube center line at the middle thereof. A bellows portion (1c) is formed near the downstream side of the inner spherical surface portion (1b), and one end of the inner tube (2) is connected to the inner spherical surface portion (1b) of the outer tube (1). It has an outer spherical surface portion (2b) that is inscribed and can be rotated, and is continuous with the outer spherical surface portion (2b) while maintaining a predetermined distance from the bellows portion (1c) of the outer tube (1). to form a fluid passage along a direction (2c), the opening of the other end (2d), is slidably inscribed in the opening of the other end (1d) of the outer tube (1) In the vicinity of the opening portion of the opening portion (1d) or the inner tube (2) of the outer tube (1) (2d), characterized by being fitted with a ring-shaped wire mesh (8).

請求項３に係る発明は、エンジンの排気路に配設され、外管（１）と内管（２）の２層から構成された排気管ジョイント（１０）であって、前記外管（１）は、一端に開口部（１ａ）が形成され、他端に開口部（１ｄ）が形成され、その中間部には管中心線上に中心点を有する半径（Ｒ）の内球面部（１ｂ）が形成され、その内球面部（１ｂ）の下流側近傍に蛇腹部（１ｃ）が形成され、前記内管（２）は、一端が前記外管（１）の前記内球面部（１ｂ）に内接されて、回動可能とする外球面部（２ｂ）を有し、その外球面部（２ｂ）に連続して前記外管（１）の蛇腹部（１ｃ）と所定距離を保って軸方向に沿う流体通路（２ｃ）を形成するとともに、他端の開口部（２ｄ）が、前記外管（１）の他端の開口部（１ｄ）に摺動可能に内接され、前記外管（１）の開口部（１ｄ）の近傍の内周面にリング状に固定され、その固定部から中央部へ向かって縮径して伸延し、前記内管（２）の開口部（２ｄ）の近傍の外周面に摺接するスライドパイプ（４）を設けたことを特徴とする。 The invention according to claim 3 is an exhaust pipe joint (10) disposed in the exhaust passage of the engine and composed of two layers of an outer pipe (1) and an inner pipe (2), the outer pipe (1). ) Has an opening (1a) at one end, an opening (1d) at the other end, and an inner spherical portion (1b) of radius (R) having a center point on the tube center line at the middle thereof. A bellows portion (1c) is formed near the downstream side of the inner spherical surface portion (1b), and one end of the inner tube (2) is connected to the inner spherical surface portion (1b) of the outer tube (1). It has an outer spherical surface portion (2b) that is inscribed and can be rotated, and is continuous with the outer spherical surface portion (2b) while maintaining a predetermined distance from the bellows portion (1c) of the outer tube (1). to form a fluid passage along a direction (2c), the opening of the other end (2d), is slidably inscribed in the opening of the other end (1d) of the outer tube (1) The inner tube (2) is fixed to the inner peripheral surface in the vicinity of the opening (1d) of the outer tube (1) in a ring shape, and the diameter is reduced from the fixed portion toward the central portion. A slide pipe (4) is provided which is in sliding contact with the outer peripheral surface in the vicinity of (2d).

請求項４に係る発明は、請求項１〜請求項３のいずれか一項に記載の排気管ジョイント（１０）であって、前記球面ジョイント部３を覆う漏斗状のカバー（１１）を前記外管（１）に取り付けたことを特徴とする。 Invention relates to an exhaust pipe joint according to any one of claims 1 to 3 (10), the outer funnel-shaped cover covering the spherical joint portion 3 (11) according to claim 4 It is attached to the pipe (1).

請求項５に係る発明は、請求項１〜請求項３のいずれか一項に記載の排気管ジョイントの製造方法であって、前記外管（１）は、前記内球面部（１ｂ）と、前記蛇腹部（１ｃ）とを別途成形した後、溶接により一体に形成することを特徴とする。 Invention of Claim 5 is a manufacturing method of the exhaust pipe joint as described in any one of Claims 1-3 , Comprising: The said outer pipe (1) is the said inner spherical surface part (1b), The bellows portion (1c) is separately formed and then integrally formed by welding.

請求項６に係る発明は、請求項１〜請求項３のいずれか一項に記載の排気管ジョイント（１０）の製造方法であって、前記外管（１）に前記蛇腹部（１ｃ）を成形する工程と、前記内管（２）に前記外球面部（２ｂ）を予備成形する工程と、前記外管（１）と前記内管（２）とを組み付ける工程と、前記外管（１）の内球面形成部（１ｂ′）と、前記内管（２）の外球面形成部（２ｂ′）とを内側から外側へ押圧する同時成形により前記球面ジョイント部（３）を成形する工程とを含むことを特徴とする。 Invention of Claim 6 is a manufacturing method of the exhaust pipe joint (10) as described in any one of Claims 1-3 , Comprising: The said bellows part (1c) is put on the said outer pipe (1). A step of forming, a step of preforming the outer spherical surface portion (2b) on the inner tube (2), a step of assembling the outer tube (1) and the inner tube (2), and the outer tube (1 And forming the spherical joint portion (3) by simultaneous molding of pressing the inner spherical surface forming portion (1b ') of the inner tube (2) and the outer spherical surface forming portion (2b') of the inner tube (2) from the inside to the outside. It is characterized by including.

請求項７に係る発明は、請求項１〜請求項３のいずれか一項に記載の排気管ジョイント（１０）の製造方法であって、前記外管（１）に前記蛇腹部（１ｃ）と、前記内球面部（１ｂ）とを成形する工程と、前記内管（２）に外球面形成部（２ｂ′）の予備成形と、流体通路（２ｃ）とを成形する工程と、前記外管（１）と前記内管（２）とを組み付ける工程と、前記外管（１）の前記内球面部（１ｂ）に対して、前記内管（２）の外球面形成部（２ｂ′）を内側から外側へ押圧して成形することにより球面ジョイント部（３）を成形する工程と、を含むことを特徴とする。 The invention according to claim 7 is a method of manufacturing an exhaust pipe joint according to any one of claims 1 to 3 (10), the bellows portion in the outer tube (1) and (1c) Forming the inner spherical surface portion (1b), preforming the outer spherical surface forming portion (2b ') in the inner tube (2), forming the fluid passage (2c), and the outer tube. (1) and a step of assembling the inner pipe (2), wherein the spherical portion of the outer tube (1) with respect to (1b), the outer spherical surface forming part of said inner tube (2) and (2b ') And a step of forming the spherical joint portion (3) by pressing from the inside to the outside and forming.

請求項１に係る発明によれば、外管は、一端に開口部が形成され、他端に開口部が形成され、その中間部には管中心線上に中心点を有する半径の内球面部が形成され、その内球面部の下流側近傍に蛇腹部が形成され、前記内管は、一端が前記外管の前記内球面部に内接されて、回動可能とする外球面部を有し、その外球面部に連続して前記外管の蛇腹部と所定距離を保って軸方向に沿う流体通路を形成するとともに、他端の開口部が、前記外管の他端の開口部に摺動可能に内接されたことにより、小型軽量かつコンパクトな排気管ジョイントを提供できる。
また、組付け作業性がよく、組み付けに時間がかからず、排気ガスが通過する際の排気抵抗が小さて排気効率が良く、熱損失が少ないので排ガス温度低下抑制効果（触媒の活性化維持）が向上し、さらに、一体方式のジョイントのため、取り付けスペースが小さい排気管ジョイントを提供することができる。 According to the first aspect of the present invention, the outer tube has an opening formed at one end , an opening formed at the other end , and an intermediate spherical portion having a center point on the tube center line at the intermediate portion. is formed, the bellows portion is formed near the downstream side of the inner spherical surface portion, the inner pipe has one end being inscribed in said spherical portion of the outer tube has an outer spherical portion that can rotate , to form a fluid passage along the axial direction while maintaining the bellows portion by a predetermined distance of the outer pipe continuously in the outer spherical surface portion, the opening of the other end, sliding the opening of the other end of the outer tube By being inscribed in a movable manner, a small, lightweight and compact exhaust pipe joint can be provided.
Also, the assembly workability is good, the assembly does not take time, the exhaust resistance when exhaust gas passes is small, the exhaust efficiency is good, and the heat loss is low, so the exhaust gas temperature lowering suppression effect (maintaining catalyst activation) In addition, the integrated joint can provide an exhaust pipe joint with a small mounting space.

また、請求項１に係る発明によれば、外管の開口部の近傍にあり、前記外管と前記内管における径方向の相対距離を一定にするために、前記内管側へ突出する凸状のビード、または、前記内管の開口部の近傍に、外管側へ突出する凸状のビードを形成したことにより、摺動部の当接面の面積を減少させ、摩擦抵抗の減少と管端部の剛性向上を図ることができ、これにより取り扱いが容易になり、組付け作業性をよくすることができる。 According to the first aspect of the present invention, the protrusion that is in the vicinity of the opening of the outer tube and protrudes toward the inner tube in order to make the radial relative distance between the outer tube and the inner tube constant. Or a convex bead that protrudes toward the outer tube in the vicinity of the opening of the inner tube, thereby reducing the area of the abutment surface of the sliding portion and reducing the frictional resistance. The rigidity of the pipe end can be improved, which facilitates handling and improves the assembling workability.

請求項２に係る発明によれば、外管の開口部あるいは内管の開口部の近傍に、リング状のワイヤーメッシュを装着したことにより、外管と内管における径方向の相対距離を一定に保つことができ、かつ、外管と内管とが軸方向に摺動することが容易にできる。また、ワイヤーメッシュの多少の伸縮により剪断方向のズレに対応が可能であるため、振動の伝達を防止することができる。 According to the invention of claim 2 , by mounting the ring-shaped wire mesh in the vicinity of the opening of the outer tube or the opening of the inner tube, the radial relative distance between the outer tube and the inner tube is made constant. The outer tube and the inner tube can be easily slid in the axial direction. Moreover, since it is possible to cope with the shear direction deviation by some expansion and contraction of the wire mesh, transmission of vibration can be prevented.

請求項３に係る発明によれば、前記外管の開口部の近傍の内周面にリング状に固定され、その固定部から中央部へ向かって縮径して伸延し、前記内管の開口部の近傍の外周面に摺接するスライドパイプを設けたことにより、軸方向の内外管の摺動が容易で、排気管ジョイントの耐久性の向上を図ることができる。 According to the invention of claim 3 , the ring is fixed to the inner peripheral surface in the vicinity of the opening portion of the outer tube, and the diameter is reduced from the fixing portion toward the center portion. By providing the slide pipe in sliding contact with the outer peripheral surface in the vicinity of the portion, the sliding of the inner and outer pipes in the axial direction is easy, and the durability of the exhaust pipe joint can be improved.

請求項４に係る発明によれば、前記球面ジョイント部３を覆う漏斗状のカバーを外管に取り付けたことにより、排気管ジョイントの球面ジョイント部の損傷防止ができ、また、排気管ジョイントの保温性の向上ができる。 According to the fourth aspect of the present invention, it is possible to prevent the spherical joint portion of the exhaust pipe joint from being damaged by attaching the funnel-shaped cover that covers the spherical joint portion 3 to the outer pipe, and to keep the exhaust pipe joint warm. Can improve the performance.

請求項５に係る発明によれば、外管は、内球面部と、蛇腹部とを別途成形した後、溶接により一体に形成することにより、一体とする外管構成になるため、工程設計の変更が可能で、一本パイプから成型加工するより、作業が容易にできる。 According to the invention of claim 5 , since the outer tube is formed integrally by welding after separately forming the inner spherical surface portion and the bellows portion, the outer tube has an integrated outer tube structure. It can be changed, and the work can be made easier than molding from a single pipe.

請求項６に係る発明によれば、請求項１項１〜請求項３のいずれか一項に記載の排気管ジョイントの製造方法は、外管に蛇腹部を成形する工程と、内管に外球面部の形成部を予備成形する工程と、外管と内管とを組み付ける工程と、前記外管の内球面形成部と、前記内管の外球面形成部とを内側から外側へ押圧する同時成形により前記球面ジョイント部を成形する工程とを含む製造方法により、簡単な製造工程と、同時成形による加工のため、品質のよいものをつくることができる。 According to the invention which concerns on Claim 6 , the manufacturing method of the exhaust pipe joint as described in any one of Claims 1-3 WHEREIN: The process of shape | molding a bellows part in an outer tube, and outside in an inner tube Simultaneously pressing the step of preforming the forming portion of the spherical portion, the step of assembling the outer tube and the inner tube, and the inner spherical surface forming portion of the outer tube and the outer spherical surface forming portion of the inner tube from the inside to the outside By a manufacturing method including a step of forming the spherical joint portion by molding, a high quality product can be produced due to a simple manufacturing step and processing by simultaneous molding.

請求項７に係る発明によれば、請求項１〜請求項３のいずれか一項に記載の排気管ジョイントの製造方法は、外管に蛇腹部と、内球面部とを成形する工程と、内管に外球面形成部の予備成形と、流体通路とを成形する工程と、外管と内管とを組み付ける工程と、外管の内球面部に対して、内管の外球面形成部を内側から外側へ押圧して成形することにより球面ジョイント部を成形する工程とを含むことにより、簡単な製造工程と、同時成形による加工のため、品質のよいものをつくることができる。また、一体成形による用具費が軽減され、その製作の作業性がよい。 According to the invention of claim 7, a manufacturing method of an exhaust pipe joint according to any one of claims 1 to 3, the step of forming the bellows portion, and an inner spherical surface portion to the outer tube, The step of preforming the outer spherical surface forming portion on the inner tube, the step of forming the fluid passage, the step of assembling the outer tube and the inner tube, and the outer spherical surface forming portion of the inner tube with respect to the inner spherical portion of the outer tube. By including the step of forming the spherical joint part by pressing from the inside to the outside and forming it, it is possible to produce a high quality product due to a simple manufacturing process and processing by simultaneous forming. Moreover, the tool cost by integral molding is reduced, and the workability of the production is good.

以下、本発明の実施の形態を、図面を参照しながら説明する。
＜第1実施形態＞
図１は第１実施形態を示す排気管ジョイント１０の断面図である。図１に示すように、外管１は、排気管ジョイント１０の両端側に接続のための左端の開口部１ａと右端の開口部１ｄが形成され、上流側の開口部１ａから排気ガスが流入し、下流側の開口部１ｄから流出する。また、外管１の間には管中心線上に中心点を有する半径Ｒの内球面部１ｂが形成され、その内球面部１ｂの下流側近傍に蛇腹部１ｃが形成されている。
なお、半径Ｒは、パイプ径＋２×球面高さ１ｈ（２〜１６ｍｍ）の１／２とするとよい。
外管１の蛇腹部１ｃは、一般にはベローズと言われるものである。また、外管１の板厚ｔ₁は、内管２の板厚ｔ₂（図２参照）と同等か、板厚ｔ₂よりも厚くする（ｔ₁≧ｔ₂）ことが好ましい。
また、Ｖ型エンジンＥにおけるエキゾースト・マニホールド３０（図１６参照）の熱変形に対応容易で、かつ、コンパクトなため、エンジン回りのレイアウトが容易である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a cross-sectional view of an exhaust pipe joint 10 showing a first embodiment. As shown in FIG. 1, the outer pipe 1 has a left end opening 1a and a right end opening 1d for connection at both ends of the exhaust pipe joint 10, and exhaust gas flows from the upstream opening 1a. And flows out from the opening 1d on the downstream side. Further, an inner spherical surface portion 1b having a radius R having a center point on the tube center line is formed between the outer tubes 1, and a bellows portion 1c is formed in the vicinity of the downstream side of the inner spherical surface portion 1b.
The radius R is preferably 1/2 of the pipe diameter + 2 × spherical height 1h (2 to 16 mm).
The bellows portion 1c of the outer tube 1 is generally called a bellows. Further, the thickness t ₁ of the outer tube 1 is either equal to the thickness t ₂ of the inner tube 2 (see FIG. 2), it is thicker than the thickness t ₂ (t ₁ ≧ t ₂₎ is preferred.
Further, since the exhaust manifold 30 (see FIG. 16) in the V-type engine E can easily cope with thermal deformation and is compact, the layout around the engine is easy.

内管２は、左端を外管１の内球面部１ｂに内接し、かつ、回動可能とする内管２の外球面部２ｂが形成され、その外球面部２ｂに連続して外管１の蛇腹部１ｃと距離を保って軸方向に沿う流体通路２ｃを形成するとともに、内管２の流体通路２ｃに設けた深めのビード（輪帯またはハチマキともいう）２ｅが形成されており、右端部が外管１の開口部１ｄに内接されている。しかも、外管１の開口部１ｄと内管２の開口部２ｄとは、お互いに摺動可能になっており、振動の減衰に効果がある。また、このビード２ｅにより、内管２の剛性が向上できる。 The inner tube 2 is formed with an outer spherical surface 2b of the inner tube 2 in which the left end is inscribed in the inner spherical surface 1b of the outer tube 1 and is rotatable, and the outer tube 1 is continuous with the outer spherical surface 2b. The fluid passage 2c is formed along the axial direction while maintaining a distance from the bellows portion 1c of the inner tube 2, and a deep bead (also referred to as a ring zone or a bee) 2e provided in the fluid passage 2c of the inner tube 2 is formed. The portion is inscribed in the opening 1 d of the outer tube 1. Moreover, the opening 1d of the outer tube 1 and the opening 2d of the inner tube 2 are slidable with respect to each other, which is effective in damping vibration. Further, the rigidity of the inner tube 2 can be improved by the bead 2e.

＜第２実施形態＞
図２は、第２実施形態を示す排気管ジョイント１０の断面図である。図２に示すように、排気管ジョイント１０は、外管１と内管２との２層から構成されている。図１とは相違点を説明するが、同部位には同符号を付して重複する説明は省略する。図１に示す排気管ジョイント１０との相違点は、内管２の流体通路２ｃに設けられた深めのビード２ｅの代わりに、外管１の内周面に深めのビード１ｅが施されている点である。このビード１ｅの先端部が、内管２の流体通路２ｃの外周面に当接することにより、摺動部の当接面の面積を減少させ、摩擦抵抗の削減と外管端部の剛性が向上できる。さらに、摺動可能により取り扱いが容易である。 <Second Embodiment>
FIG. 2 is a cross-sectional view of the exhaust pipe joint 10 showing the second embodiment. As shown in FIG. 2, the exhaust pipe joint 10 is composed of two layers of an outer pipe 1 and an inner pipe 2. Differences from FIG. 1 will be described, but the same parts are denoted by the same reference numerals and redundant description will be omitted. The difference from the exhaust pipe joint 10 shown in FIG. 1 is that a deep bead 1e is applied to the inner peripheral surface of the outer pipe 1 instead of the deep bead 2e provided in the fluid passage 2c of the inner pipe 2. Is a point. The tip of the bead 1e is in contact with the outer peripheral surface of the fluid passage 2c of the inner tube 2, thereby reducing the area of the contact surface of the sliding portion, reducing frictional resistance, and improving the rigidity of the outer tube end. it can. Furthermore, it is easy to handle because it is slidable.

＜第３実施形態＞
図３は第３実施形態を示す排気管ジョイント１０の断面図である。前記同様に同部位には同符号を付し、重複する説明は省略する。図３に示すように、排気管ジョイント１０は同様に、外管１と内管２の２層から構成されている。外管１の右端開口部１ｄの近傍に外周方向に突出する浅めのＲ形状のビード１ｅを設け、このビード１ｅの内周面にリング状のワイヤーメッシュ８を装着し、外管１と内管２における径方向の相体距離を一定に、かつ、外管１と内管２の軸方向に摺動可能に形成している。これにより、軸方向の外管１、内管２の摺動が容易になり、ワイヤーメッシュ８の多少の伸縮により剪断方向のズレに対応可能になっている。
ワイヤーメッシュ８は、形状はＯリング状であるが、材質はワイヤーの細線によって編み上げられており、耐久性、弾性にすぐれ、かつ緩衝、防振、消音などに顕著な効果を発揮する。なお、その他のワイヤーメッシュ８の装着方法としては、内管２の右端開口部２ｄの近傍に内周方向に突出する浅めのＲ形状のビード２ｅを設け、このビード２ｅの外周面にリング状のワイヤーメッシュ８を装着しても構わないし、ワイヤーメッシュ８の複数箇所を円周方向に潰し加工を施し、外管の内周壁あるいは内管の外周壁に溶接（スポット溶接が好ましい）接合しても構わない。 <Third Embodiment>
FIG. 3 is a cross-sectional view of the exhaust pipe joint 10 showing the third embodiment. Similarly to the above, the same parts are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 3, the exhaust pipe joint 10 is similarly composed of two layers, an outer pipe 1 and an inner pipe 2. A shallow R-shaped bead 1e protruding in the outer peripheral direction is provided in the vicinity of the right end opening 1d of the outer tube 1, and a ring-shaped wire mesh 8 is attached to the inner peripheral surface of the bead 1e. 2 is formed so as to be slidable in the axial direction of the outer tube 1 and the inner tube 2 at a constant radial distance. Thereby, sliding of the outer tube 1 and the inner tube 2 in the axial direction is facilitated, and the shearing direction can be accommodated by some expansion and contraction of the wire mesh 8.
The wire mesh 8 has an O-ring shape, but the material is knitted with fine wire wires, and is excellent in durability and elasticity, and exerts remarkable effects such as buffering, vibration isolation, and noise reduction. As another method for attaching the wire mesh 8, a shallow R-shaped bead 2e protruding in the inner peripheral direction is provided in the vicinity of the right end opening 2d of the inner tube 2, and a ring-like shape is provided on the outer peripheral surface of the bead 2e. The wire mesh 8 may be attached, or a plurality of portions of the wire mesh 8 may be crushed in the circumferential direction and welded (preferably spot welding) to the inner peripheral wall of the outer tube or the outer peripheral wall of the inner tube. I do not care.

＜第４実施形態＞
図４は第４実施形態を示す排気管ジョイント１０の断面図である。図４に示すように、図１との同部位には同符号を付し、重複する説明は省略する。
図４に示すように、排気管ジョイント１０は、外管１と内管２との２層に、このスライドパイプ（接続管）４の１層を追加した３層で構成されている。
スライドパイプ４は外管１の右端開口部１ｄの内周面にスポット溶接等で溶接されており、内管２の流体通路２ｃの外周面に円筒部が当接している。つまり、外管１の右端開口部１ｄの内周面にスライドパイプ４の左端部を固定し、中央部へ縮径して伸延し、内管２の右端開口部２ｄに摺動自在に嵌挿させたスライドパイプ４が構成されている。この構成ではビード１ｅ，２ｅが不要になるため、この分、比較的製造が容易である。 <Fourth embodiment>
FIG. 4 is a cross-sectional view of the exhaust pipe joint 10 showing the fourth embodiment. As shown in FIG. 4, the same parts as those in FIG.
As shown in FIG. 4, the exhaust pipe joint 10 includes three layers in which one layer of the slide pipe (connection pipe) 4 is added to the two layers of the outer tube 1 and the inner tube 2.
The slide pipe 4 is welded to the inner peripheral surface of the right end opening 1d of the outer tube 1 by spot welding or the like, and the cylindrical portion is in contact with the outer peripheral surface of the fluid passage 2c of the inner tube 2. That is, the left end portion of the slide pipe 4 is fixed to the inner peripheral surface of the right end opening portion 1d of the outer tube 1, and the diameter of the slide pipe 4 is reduced and extended to the center portion, and is slidably inserted into the right end opening portion 2d of the inner tube 2. A slide pipe 4 is formed. In this configuration, the beads 1e and 2e are not required, and therefore the manufacturing is relatively easy.

＜第５実施形態＞
図５は第５実施形態を示し、（ａ）は排気管ジョイントの通常形状の断面図であり、（ｂ）は力を受けて芯ズレが発生した変形形状を示す断面図である。図１との同部位には同符号を付し、重複する説明は省略する。
図５の（ａ）に示すように、排気管ジョイント１０は、外管１と内管２の２層から構成され、内管２の両端にはそれぞれ外球面部２ｂと外球面部２ｆが成形されている。
左端の外球面部２ｂは、外管１の内球面部１ｂに嵌め合い、球面ジョイント３を形成し、右端の外球面部２ｆは、管中心線上に中心点を有する半径Ｒ′の外球面部２ｆであり、外管１の開口部１ｄ近傍に嵌合されている。
なお、半径Ｒ′は、左端の外球面部２ｂの半径Ｒと同じであってもよいし、違ってもよい。
上流側の開口部１ａには正面視で上向きの小さな力Ｆａが発生し、下流側の開口部１ｄにはちょうど相反する小さな力Ｆｄの剪断荷重が発生しているが、各力Ｆａ，Ｆｄが微力のため、ここでは芯ズレは生じていない。
しかし、図５の（ｂ）に示すように、上向きに大きな力Ｆａが発生し、下流側の開口部１ｄにはちょうど相反する大きな力Ｆｄが発生すると、この剪断荷重により芯ズレaが生じることになる。
この場合、内管２には、外球面部２ｂと外球面部２ｆの働きにより、角度αで傾くだけで、変形しないことが判る。
なお、上向きの大きな力Ｆａは、平面視で左側からの大きな力Ｆａであってよいし、下向きの大きな力Ｆｄは、平面視で右側からの大きな力Ｆｂであって構わない。
このように、本発明の排気管ジョイント１０は、蛇腹部１ｃにより柔軟に変形することが可能であり、また、元の状態に戻ることも可能であり、変形したそのままの状態で、本来の排気管ジョイント１０の機能を発揮し続けることもできる。 <Fifth Embodiment>
5A and 5B show a fifth embodiment, in which FIG. 5A is a cross-sectional view of a normal shape of an exhaust pipe joint, and FIG. 5B is a cross-sectional view showing a deformed shape in which core misalignment occurs due to force. The same parts as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.
As shown in FIG. 5A, the exhaust pipe joint 10 is composed of two layers of an outer pipe 1 and an inner pipe 2, and an outer spherical surface portion 2b and an outer spherical surface portion 2f are formed at both ends of the inner pipe 2, respectively. Has been.
The outermost spherical surface portion 2b at the left end is fitted to the inner spherical surface portion 1b of the outer tube 1 to form a spherical joint 3, and the outer spherical surface portion 2f at the rightmost end is an outer spherical surface portion having a radius R ′ having a center point on the tube center line. 2f, which is fitted in the vicinity of the opening 1d of the outer tube 1.
The radius R ′ may be the same as or different from the radius R of the left outermost spherical portion 2b.
In the upstream opening 1a, a small upward force Fa is generated in the front view, and in the downstream opening 1d, a shear load of a small force Fd that is just opposite to each other is generated, but each force Fa, Fd is There is no misalignment here because of the weak force.
However, as shown in FIG. 5B, when a large force Fa is generated in the upward direction and a large force Fd is generated in the opening 1d on the downstream side, a misalignment a is generated due to the shear load. become.
In this case, it can be seen that the inner tube 2 is merely inclined at an angle α and not deformed by the action of the outer spherical surface portion 2b and the outer spherical surface portion 2f.
The large upward force Fa may be a large force Fa from the left side in a plan view, and the large downward force Fd may be a large force Fb from the right side in a plan view.
As described above, the exhaust pipe joint 10 of the present invention can be flexibly deformed by the bellows portion 1c, and can be returned to the original state. The function of the pipe joint 10 can also be continued.

＜第６実施形態＞
図６は第６実施形態を示す排気管ジョイントの完成品の断面図である。図６は、請求項６に係り、詳細に説明する。図６に示すように、この排気管ジョイント１０は、外管１と内管２の他に、球面ジョイント部３を覆う漏斗状のカバー１１が設けられており、外管１にスポット溶接で固定されている。
漏斗状のカバー１１の材質は、ステンレス（ＳＵＳ３０４）材であり、その厚みｔ₃は、０．３ｍｍが好適である。このように、漏斗状のカバー１１を設けることにより、球面ジョイント部３へ小石等の飛散による損傷を防止できる。また、球面ジョイント部３の変形を防止することができる。そのことにより、運搬作業における取り扱いが容易となる。また、排気管ジョイント（１０）の保温性の向上ができる。 <Sixth Embodiment>
FIG. 6 is a sectional view of a completed exhaust pipe joint showing a sixth embodiment. FIG. 6 relates to claim 6 and will be described in detail. As shown in FIG. 6, the exhaust pipe joint 10 is provided with a funnel-shaped cover 11 covering the spherical joint portion 3 in addition to the outer pipe 1 and the inner pipe 2, and is fixed to the outer pipe 1 by spot welding. Has been.
The material of the funnel-shaped cover 11 is a stainless steel (SUS304) material, its thickness t ₃ is 0.3 mm is suitable. Thus, by providing the funnel-shaped cover 11, damage to the spherical joint portion 3 due to scattering of pebbles and the like can be prevented. Further, deformation of the spherical joint portion 3 can be prevented. This facilitates handling during transportation work. Moreover, the heat retention of the exhaust pipe joint (10) can be improved.

＜第１実施形態の製造方法＞
ここで、第1実施形態に示す排気管ジョイント１０の製造方法を説明する。図７の（ａ）は、排気管ジョイント１０を構成する外管１をパイプから製造した後の断面図、（ｂ）は内管２をパイプから製造した後の断面図である。
図７の（ａ）に示すように、この形状の前工程は、パイプ材の材料取りであり、この蛇腹部１ｃを形成した外管１の長さに合わせて切断した後、左端の開口部１ａは拡径し、内球面形成部１ｂ′がパイプ材の素材径で円筒状に形成され、蛇腹部１ｃには、ベローズの製作加工を施している。
図７の（ｂ）に示すように、内管２も同様に、パイプ材の材料取りでは、仕上がり形状の長さに合わせ、左端部は外球面形成部２ｂ′が拡径し、外管１の蛇腹部１ｃとの干渉防止のため外球面部２ｂのＲより少し小さな寸法で段差部２ａを設け、そこからパイプ材の素材径とした流体通路２ｃを設け、右端の開口部２ｄの近傍に、外径側に凸状のビード２ｅを施している。 <The manufacturing method of 1st Embodiment>
Here, a manufacturing method of the exhaust pipe joint 10 shown in the first embodiment will be described. FIG. 7A is a cross-sectional view after the outer pipe 1 constituting the exhaust pipe joint 10 is manufactured from a pipe, and FIG. 7B is a cross-sectional view after the inner pipe 2 is manufactured from a pipe.
As shown in FIG. 7 (a), the pre-process of this shape is the material removal of the pipe material, and after cutting according to the length of the outer tube 1 forming this bellows portion 1c, the opening at the left end The diameter 1a is enlarged, the inner spherical surface forming portion 1b 'is formed in a cylindrical shape with the diameter of the pipe material, and the bellows portion 1c is processed to produce a bellows.
As shown in FIG. 7 (b), the inner pipe 2 is also made of pipe material in the same manner as the length of the finished shape, and the outer end surface forming part 2b 'is expanded in diameter at the left end, and the outer pipe 1 In order to prevent interference with the bellows portion 1c, a step portion 2a having a size slightly smaller than R of the outer spherical portion 2b is provided, and a fluid passage 2c having a pipe material diameter is provided therefrom, in the vicinity of the right end opening 2d. A convex bead 2e is provided on the outer diameter side.

図８は外管１と内管２を組み付けた組付品の断面図である。
図８に示すように、図７の（ｂ）に示す内管２は、外管１の左端開口部１ａより挿入すると干渉なく挿入できるので都合がよい。 FIG. 8 is a cross-sectional view of an assembled product in which the outer tube 1 and the inner tube 2 are assembled.
As shown in FIG. 8, the inner tube 2 shown in FIG. 7B can be inserted without interference when inserted from the left end opening 1 a of the outer tube 1, which is convenient.

図９は、外管１と内管２を組み付けた組付品をプレス装置５に装着した様子を示す断面図である。図９に示すように、図の上が上方であり、図の下が下方である。
プレス装置５は、金型の上型５ａと、金型の下型５ｂと、受圧芯金５ｃと、加圧芯金５ｄと、ガイド５ｅと、弾性体６とから構成されており、金型が上下に分割線ｂによって分割されている。
受圧芯金５ｃと加圧芯金５ｄとの間に角リング状の弾性体６を介してガイド５ｅによって一体に組み付けられ、図８に示した排気管ジョイント１０が挿入され、これらが分割された金型の下型５ｂに装着された後、金型の上型５ａによって挟持され、固定される。
上型５ａ、下型５ａには、リング状の空洞部５ｆが形成され、この空洞部５ｆにはちょうど蛇腹部１ｃの凸部が外周部を嵌合させて装着されている。
さらに、上型５ｂには、内球面部１ｂを形成する球面状の凹部５ｇが形成されており、この段階では、外管１との間が空洞になっている。
弾性体６は、ウレタンゴムであるが、弾性体であれば、これ以外の高分子化合物であってもよい。 FIG. 9 is a cross-sectional view showing a state in which an assembled product in which the outer tube 1 and the inner tube 2 are assembled is mounted on the press device 5. As shown in FIG. 9, the top of the figure is the top and the bottom of the figure is the bottom.
The press device 5 includes an upper mold 5a of a mold, a lower mold 5b of the mold, a pressure receiving metal core 5c, a pressure metal core 5d, a guide 5e, and an elastic body 6. Are vertically divided by a dividing line b.
The pressure receiving metal core 5c and the pressure metal core 5d are assembled together by a guide 5e through a square ring-shaped elastic body 6, and the exhaust pipe joint 10 shown in FIG. 8 is inserted and divided. After being mounted on the lower mold 5b of the mold, it is sandwiched and fixed by the upper mold 5a of the mold.
The upper mold 5a and the lower mold 5a are formed with ring-shaped cavities 5f, and the convex portions of the bellows 1c are fitted into the cavities 5f with the outer peripheral portions fitted.
Further, the upper mold 5b is formed with a spherical concave portion 5g for forming the inner spherical surface portion 1b. At this stage, the space between the upper die 5b and the outer tube 1 is hollow.
The elastic body 6 is urethane rubber, but may be a polymer compound other than this as long as it is an elastic body.

図１０はウレタンバルジ加工を示す断面図である。図１０に示すように、加圧芯金５ｄが右方向へ可動して弾性体６が加圧されると、この弾性体６は、受圧芯金５ｃによって上型５ｂ内に形成された球面の凹部５ｇの形状に合わせて太鼓状に変形し、内球面部１ｂと外球面部２ｂとが内側から外側へ押圧されて塑性加工され、球面ジョイント部３が成形される。 FIG. 10 is a cross-sectional view showing urethane bulge processing. As shown in FIG. 10, when the pressure core 5d moves to the right and the elastic body 6 is pressurized, the elastic body 6 is a spherical surface formed in the upper die 5b by the pressure receiving core 5c. The inner spherical surface portion 1b and the outer spherical surface portion 2b are pressed from the inside to the outside to be plastically processed according to the shape of the concave portion 5g, and the spherical joint portion 3 is formed.

図１１は金型から取り出した完成品の断面図である。このように、製造方法は極めて簡単である。この結果、排気ガスは上流側から下流側へ流れるが、排気ガスの流れを遮る出っ張りがなく、排気ガスが内管２を通過する排気抵抗は小さくて排気効率が良く、さらに、取り付けスペースが小さい排気管ジョイントと、排気管ジョイントの製造方法を提供することができる。 FIG. 11 is a cross-sectional view of the finished product taken out from the mold. Thus, the manufacturing method is very simple. As a result, the exhaust gas flows from the upstream side to the downstream side, but there is no protrusion that blocks the flow of the exhaust gas, the exhaust resistance through which the exhaust gas passes through the inner pipe 2 is small, the exhaust efficiency is good, and the mounting space is small An exhaust pipe joint and a method for manufacturing the exhaust pipe joint can be provided.

＜第２実施形態の製造方法＞
つぎに、第２実施形態に示す排気管ジョイント１０の製造方法を説明する。図１２の（ａ）は排気管ジョイント１０の外管１をパイプから製造した断面図、（ｂ）は内管２の側面図、（ｃ）は（ａ）に示す溶接部を設けた場合の溶接部の拡大図である。
図１２の（ａ）に示すように、パイプ材の材料の長さは、この蛇腹部１ｃを形成した外管１の長さに合わせ、左端開口部１ａは縮径して、かつ、２本のビード１ｆ，１ｇを形成し、その右隣には半径Ｒの内球面部１ｂが形成されている。さらに、その内球面部１ｂの右隣には、蛇腹部１ｃが形成され、さらに、ビード１ｅが形成されている。
図１２の（ｂ）に示すように、内管２は、パイプ材の材料取りでは、仕上がり形状の長さに合わせて切断した後、右端開口部２ｄは縮径して、内球面部１ｂの半径Ｒに合わせた球面の段差部２ａが形成されている。 <Manufacturing Method of Second Embodiment>
Below, the manufacturing method of the exhaust pipe joint 10 shown in 2nd Embodiment is demonstrated. 12A is a cross-sectional view of the outer pipe 1 of the exhaust pipe joint 10 manufactured from a pipe, FIG. 12B is a side view of the inner pipe 2, and FIG. 12C is a case where the weld shown in FIG. It is an enlarged view of a welding part.
As shown in FIG. 12 (a), the length of the pipe material matches the length of the outer tube 1 forming the bellows portion 1c, the left end opening 1a is reduced in diameter, and two The beads 1f and 1g are formed, and an inner spherical surface portion 1b having a radius R is formed on the right side thereof. Further, a bellows portion 1c is formed on the right side of the inner spherical surface portion 1b, and a bead 1e is further formed.
As shown in FIG. 12 (b), in the pipe material processing, the inner tube 2 is cut to the length of the finished shape, and then the right end opening 2d is reduced in diameter so that the inner spherical portion 1b A stepped portion 2a having a spherical surface matching the radius R is formed.

図１２の（ｃ）は、請求項６に係り、詳細に説明する。図１２の（ｃ）に示すように、外管（１）は、内球面部（１ｂ）と、蛇腹部（１ｃ）とを別途成形した後に、溶接により一体に形成してもよい。溶接の形式、方法等はこのような重ね継手溶接以外にも、突合せ溶接であってもよく、また、重ね継手の接着剤による一体化であっても構わない。
例えば、このような２ピース化によって、内球面部１ｂの板厚ｔ₁を蛇腹部１ｃより厚い板厚のパイプを使用し、内球面部１ｂの強度アップを図ることが可能である。また、蛇腹部１ｃの板厚ｔ₁を内球面部１ｂより薄い板厚のパイプを使用することにより蛇腹部１ｃの機能であるエンジンの振動を減衰させ、下流側にある排気装置に悪影響を与えないように機能の向上を図ることも可能となる。 FIG. 12C relates to claim 6 and will be described in detail. As shown in FIG. 12 (c), the outer tube (1) may be integrally formed by welding after separately forming the inner spherical surface portion (1b) and the bellows portion (1c). The welding type, method, and the like may be butt welding in addition to such lap joint welding, or may be integration of the lap joint with an adhesive.
For example, such a two-piece of the plate thickness t ₁ using a thick plate thickness of the pipe from the bellows portion 1c of the inner spherical surface portion 1b, it is possible to increase the strength of the inner spherical surface portion 1b. Further, by using a pipe having a plate thickness t ₁ of the bellows portion 1c thinner than that of the inner spherical surface portion 1b, the vibration of the engine which is a function of the bellows portion 1c is attenuated, and the exhaust device on the downstream side is adversely affected. It is also possible to improve the function so that there is no problem.

図１３は外管１と内管２とを組み付けた組付品の断面図である。図１３に示すように、内管２は、外管１の開口部１ａから干渉なく挿入することができる。このとき、外管１と内管２との隙間に極薄のシート７を挿入してもよい。このシート７分の厚みが隙間になってちょうどよい嵌合の球状ジョイント３を容易に成形することができる。 FIG. 13 is a cross-sectional view of an assembled product in which the outer tube 1 and the inner tube 2 are assembled. As shown in FIG. 13, the inner tube 2 can be inserted from the opening 1 a of the outer tube 1 without interference. At this time, an extremely thin sheet 7 may be inserted into the gap between the outer tube 1 and the inner tube 2. It is possible to easily form the spherical joint 3 having a good fit with the sheet having a thickness of 7 minutes.

図１４は、外管１と内管２とを組み付けた組立品をプレス装置５に装着した様子を示す断面図である。図１４に示すように、プレス装置５は、前記同様、金型の上型５ａと、金型の下型５ｂと、受圧芯金５ｃと、加圧芯金５ｄと、ガイド５ｅと、弾性体６とから構成されており、金型が上下に分割線ｂによって分割されている。
受圧芯金５ｃと加圧芯金５ｄとの間に角リング状の弾性体６を介してガイド５ｅによって一体に組み付けられ、図１３に示した排気管ジョイント１０が、これらが分割された金型の下型５ｂに装着された後、金型の上型５ａによって挟持され、固定される。
上型５ａ、下型５ｂには、リング状の空洞部５ｆが形成され、この空洞部５ｆにはちょうど同じ幅寸法の蛇腹部１ｃが外周部を嵌合させて装着されている。
上型５ａ、下型５ｂには、球面状の凹部５ｇが形成され、内球面部１ｂが嵌合されている。そして、装着された外管１と内管２との間に空洞ができており、この空洞にシート７が介在している。
弾性体６は、ウレタンゴムであるが、弾性体であれば、高分子化合物であってもよいし、これ以外であってもよい。 FIG. 14 is a cross-sectional view illustrating a state in which an assembly in which the outer tube 1 and the inner tube 2 are assembled is mounted on the press device 5. As shown in FIG. 14, the press device 5 includes a mold upper mold 5a, a mold lower mold 5b, a pressure receiving metal core 5c, a pressure metal core 5d, a guide 5e, and an elastic body. 6 and the mold is vertically divided by a dividing line b.
A mold in which the exhaust pipe joint 10 shown in FIG. 13 is divided by a guide 5e that is integrally assembled between a pressure receiving metal core 5c and a pressure metal core 5d via a rectangular ring-shaped elastic body 6. After being mounted on the lower mold 5b, it is clamped and fixed by the upper mold 5a of the mold.
The upper mold 5a and the lower mold 5b are formed with ring-shaped cavities 5f, and the accordion portions 1c having the same width are fitted to the cavities 5f with the outer peripheral portions thereof fitted.
The upper mold 5a and the lower mold 5b are formed with spherical recesses 5g and fitted with the inner spherical surface 1b. A cavity is formed between the mounted outer tube 1 and inner tube 2, and a sheet 7 is interposed in the cavity.
The elastic body 6 is urethane rubber, but may be a polymer compound or any other material as long as it is an elastic body.

図１５はウレタンバルジ加工を示す断面図である。図１５に示すように、排気管ジョイント１０は、加圧芯金５ｄが右方向へ可動して弾性体６が加圧されると、この弾性体６は、受圧芯金５ｃによって上型５ｂ内に形成された球面の凹部形状に合わせて太鼓状に変形し、シート７を挟んで内球面部１ｂが外球面部２ｂに内側から外側へ押圧されて球面ジョイント部３が成形される。
なお、シート７の材質は、たとえば、カーボンブラック入りポリプロピレンシートまたはポリエチレンシート、ポリプロピレンシートまたはポリエチレンシートの両面にカーボン入り塗料、または、潤滑剤を塗付するものが好適である。これらのシート材の分解温度は、ポリプロピレンが３２８〜４１０℃で、ポリエチレンが３３５〜４５０℃であり、これらの加熱によって分解するため、回動するための隙間嵌合を容易に形成することができる。 FIG. 15 is a sectional view showing urethane bulge processing. As shown in FIG. 15, in the exhaust pipe joint 10, when the pressure core 5d is moved rightward and the elastic body 6 is pressurized, the elastic body 6 is moved into the upper die 5b by the pressure receiving core 5c. The inner spherical surface portion 1b is pressed against the outer spherical surface portion 2b from the inner side to the outer side with the sheet 7 interposed therebetween, so that the spherical joint portion 3 is formed.
In addition, the material of the sheet 7 is preferably, for example, a carbon black-containing polypropylene sheet or polyethylene sheet, or a coating containing carbon or a lubricant on both surfaces of the polypropylene sheet or polyethylene sheet. The decomposition temperatures of these sheet materials are 328 to 410 ° C. for polypropylene and 335 to 450 ° C. for polyethylene. Since these materials are decomposed by heating, gap fitting for rotation can be easily formed. .

図１６は、完成品の半断面図である。図１６に示すように、排気管ジョイント１０は、この外管１の外周には、さらにアウターブレード９が設けられている。このアウターブレード９の材質は、ＳＵＳ３０４であり、φ０．４の細線で織り込まれている。ちょうど４５°方向に交差させて織られているため、伸縮性を有している。このアウターブレード９の装着により、下流にキャタリストなどの重量物が吊り下げられると、悪路走行で振動が発生した場合、蛇腹部１ｂに下方向の荷重がかることになるが、このアウターブレード９を取り付けることにより、蛇腹部１ｂのベローズが必要以上に伸びることを防止して排気管ジョイント１０の耐久性の向上を図ることができるとともに、蛇腹部１ｂのベローズに板厚の薄いものを使用して伸縮しやすいようにした場合には、エンジンの振動が原因で蛇腹部１ｂのベローズが共振を起こすのを抑制する効果（共振振動抑制効果）がある。
また、排気管ジョイント１０の球面ジョイント部３は、物などが当たり、少しの変形でダメージをうけるので、この変形防止と、排気管ジョイント１０保温性の向上を図ることができる。さらに、排気管ジョイント１０に直接触れることがないので、火傷防止という安全対策もできる。 FIG. 16 is a half sectional view of the finished product. As shown in FIG. 16, the exhaust pipe joint 10 is further provided with an outer blade 9 on the outer periphery of the outer pipe 1. The material of the outer blade 9 is SUS304, and is woven with a fine wire of φ0.4. Since it is woven by crossing in the 45 ° direction, it has elasticity. When a heavy object such as a catalyst is suspended downstream by the attachment of the outer blade 9, a downward load is applied to the bellows portion 1b when vibration occurs on a rough road. By attaching the bellows, the bellows of the bellows portion 1b can be prevented from extending more than necessary to improve the durability of the exhaust pipe joint 10, and the bellows of the bellows portion 1b is made of a thin plate. In this case, the bellows of the bellows portion 1b has an effect of suppressing resonance (resonance vibration suppression effect) due to engine vibration.
Further, since the spherical joint portion 3 of the exhaust pipe joint 10 is hit by an object or the like and is damaged by a slight deformation, it is possible to prevent the deformation and improve the heat retention of the exhaust pipe joint 10. Further, since the exhaust pipe joint 10 is not directly touched, a safety measure for preventing burns can be taken.

本発明はその技術思想の範囲内で種々の改造、変更が可能である。例えば、排気管ジョイント１０はＶ型エンジン用として説明したが、他のエンジンであっても構わない。
また、ポリプロピレン等の高分子化合物以外のシート材として、ペーパーであってもよい。加熱により分解燃焼し隙間を形成できるものであれば、その他であってもよい。 The present invention can be modified and changed in various ways within the scope of its technical idea. For example, although the exhaust pipe joint 10 has been described for a V-type engine, it may be another engine.
Further, paper may be used as a sheet material other than a polymer compound such as polypropylene. Others may be used as long as they can be decomposed and burned by heating to form a gap.

第1実施形態を示す排気管ジョイントの断面図である。1 is a cross-sectional view of an exhaust pipe joint showing a first embodiment. 第２実施形態を示す排気管ジョイントの断面図である。It is sectional drawing of the exhaust pipe joint which shows 2nd Embodiment. 第３実施形態を示す排気管ジョイントの断面図である。It is sectional drawing of the exhaust pipe joint which shows 3rd Embodiment. 第４実施形態を示す排気管ジョイントの断面図である。It is sectional drawing of the exhaust pipe joint which shows 4th Embodiment. 第５実施形態を示し、（ａ）は排気管ジョイントの通常形状の断面図であり、（ｂ）は力を受けて芯ズレが発生した変形形状を示す断面図である。FIG. 5A is a cross-sectional view of a normal shape of an exhaust pipe joint, and FIG. 5B is a cross-sectional view illustrating a deformed shape in which a core misalignment occurs due to a force. 第６実施形態を示す排気管ジョイントの完成品の断面図である。It is sectional drawing of the completed product of the exhaust pipe joint which shows 6th Embodiment. （ａ）は排気管ジョイントの外管１をパイプから製造した後の断面図、（ｂ）は内管をパイプから製造した後の断面図である。(A) is sectional drawing after manufacturing the outer pipe 1 of an exhaust pipe joint from a pipe, (b) is sectional drawing after manufacturing an inner pipe from a pipe. 外管と内管を組み付けた組付品の断面図である。It is sectional drawing of the assembly | attachment goods which assembled | attached the outer tube | pipe and the inner tube | pipe. 外管と内管を組み付けた組付品をプレス装置に装着した様子を示す断面図である。It is sectional drawing which shows a mode that the assembly | attachment goods which assembled | attached the outer tube and the inner tube were mounted | worn with the press apparatus. ウレタンバルジ加工を示す断面図である。It is sectional drawing which shows a urethane bulge process. 金型から取り出した完成品の断面図である。It is sectional drawing of the finished product taken out from the metal mold | die. （ａ）は排気管ジョイントの外管をパイプから製造した断面図、（ｂ）は内管の側面図、（ｃ）は（ａ）に示す溶接部の拡大図である。(A) is sectional drawing which manufactured the outer tube | pipe of the exhaust pipe joint from the pipe, (b) is a side view of an inner tube, (c) is an enlarged view of the welding part shown to (a). 外管と内管とを組み付けた組付品の断面図である。It is sectional drawing of the assembly | attachment goods which assembled | attached the outer tube | pipe and the inner tube | pipe. 外管と内管とを組み付けた組付品をプレス装置に装着した様子を示す断面図である。It is sectional drawing which shows a mode that the assembly | attachment goods which assembled | attached the outer tube and the inner tube were mounted | worn with the press apparatus. ウレタンバルジ加工を示す断面図である。It is sectional drawing which shows a urethane bulge process. 完成品の半断面図である。It is a half sectional view of a finished product. Ｖ型エンジンＥの排気管の構成を示す配置図である。3 is a layout diagram illustrating a configuration of an exhaust pipe of a V-type engine E. FIG. 従来の自動車排気管用の継手の断面図である。It is sectional drawing of the coupling for conventional vehicle exhaust pipes.

Explanation of symbols

１外管
１ａ開口部
１ｂ内球面部
１ｂ′ 内球面形成部
１ｃ蛇腹部
１ｄ開口部
１ｅ，１ｆ，１ｇ，２ｅビード（輪帯、ハチマキ）
１ｈ球面高さ
２内管
２ａ段差部
２ｂ，２ｆ外球面部
２ｂ′ 外球面形成部
２ｃ流体通路
３球面ジョイント部
４スライドパイプ（接続管）
５プレス装置
５ａ上型
５ｂ下型
５ｃ加圧芯金
５ｄ受圧芯金
５ｅガイド
５ｆ空洞部
５ｇ凹部
６弾性体（ウレタンゴム）
７シート
８ワイヤーメッシュ
９アウターブレード
１０排気管ジョイント
１１漏斗状カバー
ａ芯ズレ
ｂ分割線 DESCRIPTION OF SYMBOLS 1 Outer tube 1a Opening part 1b Inner spherical surface part 1b 'Inner spherical surface formation part 1c Bellows part 1d Opening part 1e, 1f, 1g, 2e Bead (ring zone, Hachimaki)
1h Spherical height 2 Inner tube 2a Stepped portion 2b, 2f Outer spherical surface portion 2b 'Outer spherical surface forming portion 2c Fluid passage 3 Spherical joint portion 4 Slide pipe (connection pipe)
DESCRIPTION OF SYMBOLS 5 Press apparatus 5a Upper mold | type 5b Lower mold | type 5c Pressure cored bar 5d Pressure receiving cored bar 5e Guide 5f Cavity part 5g Recessed part 6 Elastic body (urethane rubber)
7 Sheet 8 Wire mesh 9 Outer blade 10 Exhaust pipe joint 11 Funnel-shaped cover a Core misalignment b Dividing line

Claims

An exhaust pipe joint (10) disposed in the exhaust path of the engine and composed of two layers of an outer pipe (1) and an inner pipe (2),
The outer tube (1) has an opening (1a) is formed at one end, the other end opening (1d) is formed on, of the radius (R) having a center point on the tube centerline in the intermediate section A spherical portion (1b) is formed, and a bellows portion (1c) is formed near the downstream side of the inner spherical portion (1b) .
The inner tube (2) has an outer spherical surface portion (2b) whose one end is inscribed in the inner spherical surface portion (1b) of the outer tube (1) and is rotatable. 2b), a fluid passageway (2c) is formed along the axial direction while maintaining a predetermined distance from the bellows part (1c) of the outer tube (1), and the opening (2d) at the other end is slidably inscribed in the opening of the other end of the tube (1) (1d),
In the vicinity of the opening (1d) of the outer pipe (1), the inner pipe (2) side is used to make the radial relative distance between the outer pipe (1) and the inner pipe (2) constant. Exhaust gas characterized in that a convex bead (1e) protruding toward the outer tube (1) or a convex bead (2e) protruding toward the outer tube (1) is formed on the outer tube (1) or the inner tube (2). Pipe joint (10).

An exhaust pipe joint (10) disposed in the exhaust path of the engine and composed of two layers of an outer pipe (1) and an inner pipe (2),
The outer tube (1) has an opening (1a) at one end, an opening (1d) at the other end, and an intermediate portion of a radius (R) having a center point on the tube center line. A spherical portion (1b) is formed, and a bellows portion (1c) is formed near the downstream side of the inner spherical portion (1b).
The inner tube (2) has an outer spherical surface portion (2b) whose one end is inscribed in the inner spherical surface portion (1b) of the outer tube (1) and is rotatable. 2b), a fluid passageway (2c) is formed along the axial direction while maintaining a predetermined distance from the bellows part (1c) of the outer tube (1), and the opening (2d) at the other end is Slidably inscribed in the opening (1d) at the other end of the tube (1),
An exhaust pipe joint (10) characterized by mounting a ring-shaped wire mesh (8) in the vicinity of the opening (1d) of the outer pipe (1) or the opening (2d) of the inner pipe (2). ).

An exhaust pipe joint (10) disposed in the exhaust path of the engine and composed of two layers of an outer pipe (1) and an inner pipe (2),
The outer tube (1) has an opening (1a) at one end, an opening (1d) at the other end, and an intermediate portion of a radius (R) having a center point on the tube center line. A spherical portion (1b) is formed, and a bellows portion (1c) is formed near the downstream side of the inner spherical portion (1b).
The inner tube (2) has an outer spherical surface portion (2b) whose one end is inscribed in the inner spherical surface portion (1b) of the outer tube (1) and is rotatable. 2b), a fluid passageway (2c) is formed along the axial direction while maintaining a predetermined distance from the bellows part (1c) of the outer tube (1), and the opening (2d) at the other end is Slidably inscribed in the opening (1d) at the other end of the tube (1) ,
The inner tube (2) is fixed to the inner peripheral surface in the vicinity of the opening (1d) of the outer tube (1) in a ring shape, and the diameter is reduced from the fixed portion toward the central portion. An exhaust pipe joint (10) characterized in that a slide pipe (4) is provided in sliding contact with the outer peripheral surface in the vicinity of (2d).

The exhaust pipe joint (10) according to any one of claims 1 to 3 , wherein a funnel-shaped cover (11) covering the spherical joint part 3 is attached to the outer pipe (1). .

The outer tube (1), the inside spherical surface portion and (1b), after the bellows part and (1c) separately forming any of claims 1 to 3, characterized in that integrally formed by welding A method for manufacturing the exhaust pipe joint (10) according to claim 1.

Forming the bellows portion (1c) in the outer tube (1);
Preforming the outer spherical surface portion (2b) on the inner tube (2);
Assembling the outer pipe (1) and the inner pipe (2);
The spherical joint portion (3) is simultaneously molded by pressing the inner spherical surface forming portion (1b ') of the outer tube (1) and the outer spherical surface forming portion (2b') of the inner tube (2) from the inside to the outside. Forming the step,
The manufacturing method of the exhaust pipe joint (10) as described in any one of Claims 1-3 characterized by the above-mentioned.

Forming the inner spherical surface portion (1b) and the bellows portion (1c) in the outer tube (1);
A step of preforming an outer spherical surface forming portion (2b ') in the inner tube (2) and a fluid passage (2c);
Assembling the outer pipe (1) and the inner pipe (2);
Against the inner spherical surface portion of the outer tube (1) (1b), the spherical joint portion by outer spherical surface forming portion (2b ') is molded by pressing from the inside to the outside of the inner tube (2) (3 )
The manufacturing method of the exhaust pipe joint (10) as described in any one of Claims 1-3 characterized by the above-mentioned.