JPH07158436A - Exhaust pipe connecting structure and exhaust pipe connecting collar structure - Google Patents
Exhaust pipe connecting structure and exhaust pipe connecting collar structureInfo
- Publication number
- JPH07158436A JPH07158436A JP30661893A JP30661893A JPH07158436A JP H07158436 A JPH07158436 A JP H07158436A JP 30661893 A JP30661893 A JP 30661893A JP 30661893 A JP30661893 A JP 30661893A JP H07158436 A JPH07158436 A JP H07158436A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- flange
- collar
- corrugated
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排気ガスの保温効果の
高い排気管の接続構造、及び排気管接続用カラー構造に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe connecting structure having a high effect of keeping exhaust gas warm and an exhaust pipe connecting collar structure.
【０００２】[0002]
【従来の技術】従来、自動車等では、排気ガス浄化のた
めに、化学反応による触媒を排気管に介設している。こ
の場合、触媒の低温活性を向上させることは一般に車両
のコスト低減、及び信頼性向上に寄与し、極めて重要な
課題となる。しかし、排気ガス温、触媒ともに低温であ
る始動時には排気ガス内未燃成分が十分に反応しきれな
い状況が発生するため、排気管に高価な大容量触媒を装
着し、あるいはマニホールド直下に触媒を装着する必要
がある。これにより、始動時でもある程度化学反応を促
進させ得るが、特にマニホールド直下に触媒を装着する
ことは、その高温特性により周囲の電気部品等に悪影響
を与えることになる。このため、触媒を囲む遮熱板を大
型化したり、冷却ファン容量を増大させて対応する必要
がある。2. Description of the Related Art Conventionally, in automobiles and the like, a catalyst by a chemical reaction is provided in an exhaust pipe for purifying exhaust gas. In this case, improving the low temperature activity of the catalyst generally contributes to cost reduction and reliability improvement of the vehicle, which is a very important issue. However, since both the exhaust gas temperature and the catalyst are at low temperature, the unburned components in the exhaust gas may not fully react at the time of startup.Therefore, install an expensive large-capacity catalyst in the exhaust pipe or install the catalyst directly below the manifold. Must be installed. As a result, the chemical reaction can be promoted to some extent even at the time of starting, but especially when the catalyst is mounted directly below the manifold, its high temperature characteristics adversely affect the surrounding electric parts and the like. Therefore, it is necessary to increase the size of the heat shield plate surrounding the catalyst or increase the capacity of the cooling fan to cope with the problem.
【０００３】一方、上記のような問題を招くことなく触
媒の低温活性を向上させるには、排気ガスの保温効果を
できるだけ高めれば良く、このためには、排気管内壁温
度を速やかに上昇させる必要がある。しかし、一般には
排気管取付フランジ部の外気に接する伝熱面積が大きい
ことや、シリンダヘッドという低温部品に接続されてい
ることから、排気ガスの熱量を吸収してしまい、昇温特
性を阻害する恐れがある。On the other hand, in order to improve the low temperature activity of the catalyst without causing the above problems, it is sufficient to increase the heat retention effect of the exhaust gas as much as possible. For this purpose, it is necessary to raise the temperature of the exhaust pipe inner wall promptly. There is. However, in general, the heat transfer area of the exhaust pipe mounting flange in contact with the outside air is large, and since it is connected to a low temperature component called a cylinder head, it absorbs the heat quantity of the exhaust gas and hinders the temperature rise characteristics. There is a fear.
【０００４】このことは、例えば熱地での高負荷走行時
に、排気ガスから排気管に伝わる熱がフランジ部を介し
てシリンダヘッドに逆流する結果、冷却水の放熱量を増
大させてエンジン温度を高くする現象を招く。This is because, for example, when running under a high load in a hot area, the heat transmitted from the exhaust gas to the exhaust pipe flows back to the cylinder head through the flange portion, so that the heat radiation amount of the cooling water is increased and the engine temperature is increased. Invites the phenomenon of increasing the height.
【０００５】従って今日では、排気管取付フランジ部に
断熱手段を講じることが一般化している。Therefore, it is now common to provide a heat insulating means on the exhaust pipe mounting flange portion.
【０００６】従来の断熱手段を有する一般的な排気管で
は、図８に示すように、エンジン１と排気管２とを接続
する際に、エンジン１のシリンダヘッド１a と排気管２
のフランジ２a との間に、ガスケット３を介在させてい
る。この場合の温度特性は、図９に示すように、シリン
ダヘッド１a の部分は冷却水循環のため最も温度が低
く、ガスケット３の部分で排気管２から熱伝導により熱
は逃げるが、一気に温度が上昇し、排気管２ではガスケ
ット３近傍から排気下流側にかけてさらに温度が上昇す
るという特性である。従って、排気管２のフランジ２a
の付近では高温の熱が伝導により逃げており、この部分
では内壁温が低く、排気ガスは対流放熱により多くの熱
を放散し、昇温性能が損なわれている。In a conventional exhaust pipe having conventional heat insulating means, as shown in FIG. 8, when connecting the engine 1 and the exhaust pipe 2, the cylinder head 1a of the engine 1 and the exhaust pipe 2 are connected.
The gasket 3 is interposed between the flange 2a and the flange 2a. As for the temperature characteristic in this case, as shown in FIG. 9, the cylinder head 1a has the lowest temperature due to the circulation of the cooling water, and the heat escapes from the exhaust pipe 2 at the gasket 3 by heat conduction, but the temperature rises at once. However, in the exhaust pipe 2, the temperature further rises from the vicinity of the gasket 3 to the exhaust downstream side. Therefore, the flange 2a of the exhaust pipe 2
In the vicinity of, the high temperature heat escapes by conduction, the inner wall temperature is low in this part, and the exhaust gas dissipates much heat by convective heat dissipation, impairing the temperature raising performance.
【０００７】そこで、昇温特性を向上させた排気管が種
々開発されている。その従来例としては、例えば、実開
昭５５−３６９５３号公報、特開昭５５−１６１９１４
号公報、特開平２−７５７１４号公報のものが知られて
いる。Therefore, various exhaust pipes having improved temperature rising characteristics have been developed. As conventional examples thereof, for example, Japanese Utility Model Laid-Open No. 55-36953 and Japanese Patent Laid-Open No. 55-161914.
JP-A No. 2-75714 and JP-A No. 2-75714 are known.
【０００８】実開昭５５−３６９５３号公報に記載の排
気管は、図１０に示すように、排気ポート１１と排気管
１２の接続フランジ１３との間に、両者に挟持される環
状の挟持部材１４を介して円筒状のカラー１５を一体的
に固定したものであり、カラー１５が排気管１２内へ伸
びて、接続フランジ１３等の内周側を覆っている。従っ
て、排気ガスは、接続フランジ１３等との接触が抑制さ
れ、排気ガスの保温効果を期待することができる。The exhaust pipe described in Japanese Utility Model Laid-Open No. 55-36953 is, as shown in FIG. 10, an annular holding member held between the exhaust port 11 and the connecting flange 13 of the exhaust pipe 12. A cylindrical collar 15 is integrally fixed via 14 and the collar 15 extends into the exhaust pipe 12 to cover the inner peripheral side of the connection flange 13 and the like. Therefore, the contact of the exhaust gas with the connection flange 13 and the like is suppressed, and the heat retaining effect of the exhaust gas can be expected.
【０００９】特開昭５５−１６１９１４号公報に記載の
排気管は、図１１に示すように、シリンダヘッド２１側
に、フランジを有する筒状のカラー２２を設け、排気集
合管２３側にも、フランジを有する筒状のカラー２４を
設けている。従って、カラー２２，２４により、排気ガ
スの保温効果を期待することができる。As shown in FIG. 11, the exhaust pipe described in JP-A-55-161914 is provided with a cylindrical collar 22 having a flange on the cylinder head 21 side, and also on the exhaust collecting pipe 23 side. A tubular collar 24 having a flange is provided. Therefore, the collars 22 and 24 can be expected to have an effect of keeping exhaust gas warm.
【００１０】特開平２−７５７１４号公報に記載の排気
管は、図１２に示すように、排気管取付フランジ３１の
両側にガスケット３２を設けている。この場合、両側の
ガスケット３２で伝導による熱移動量を低減させ、排気
ガスの保温効果を期待することができる。As shown in FIG. 12, the exhaust pipe described in Japanese Patent Laid-Open No. 2-75714 has gaskets 32 provided on both sides of the exhaust pipe mounting flange 31. In this case, the amount of heat transfer due to conduction can be reduced by the gaskets 32 on both sides, and the effect of keeping the exhaust gas warm can be expected.
【００１１】[0011]
【発明が解決しようとする課題】図１０〜図１２に示す
従来技術においては、いずれも部品点数が多く、組付け
が困難である。また低温のフランジ部とカラー本体、あ
るいは排気管本体との熱膨脹差により変形したり、亀裂
を生じる恐れがある。さらに各接続部は面接触であるた
め、伝熱面積が大きく、十分な断熱効果が得られていな
いという問題がある。In each of the prior arts shown in FIGS. 10 to 12, the number of parts is large and assembly is difficult. Further, there is a risk of deformation or cracking due to the difference in thermal expansion between the flange portion at low temperature and the collar body or the exhaust pipe body. Further, since the respective connecting portions are in surface contact with each other, there is a problem that the heat transfer area is large and a sufficient heat insulating effect is not obtained.
【００１２】本発明は、上記課題に鑑みて成されたもの
であり、少ない部品点数で組付けを容易にし、しかも熱
膨脹差による悪影響の低減、及び伝熱面積の縮小化を図
り、常に安定した状態で断熱効果を向上させることので
きる排気管の接続構造、及び排気管接続用カラー構造を
提供することを目的とする。The present invention has been made in view of the above problems, and facilitates the assembly with a small number of parts, and further reduces the adverse effect due to the difference in thermal expansion and reduces the heat transfer area, and is always stable. An object of the present invention is to provide an exhaust pipe connecting structure and an exhaust pipe connecting collar structure capable of improving the heat insulating effect in a state.
【００１３】[0013]
【課題を解決するための手段】請求項１記載の発明は、
端部周囲に結合フランジを有した排気管を、排気口に合
わせて配置し、前記結合フランジを前記排気口周囲の相
手方取付面に締結結合する排気管の接続構造において、
前記排気口側から前記排気管側へ渡って遊嵌状態で挿入
された筒状のカラー本体を設け、前記カラー本体の外周
を、前記結合フランジと相手方取付面との間に介設され
る環状のシールフランジの内周に固定し、前記シールフ
ランジを、内周側から外周側にかけて波板状に形成して
半径方向内側に自由状態で最も低い第１の波部、同中間
部に最も高い第２の波部、同外側に同第２の波部より低
い第３の波部を設け、かつ、外周端縁を前記結合フラン
ジまたは相手方取付面に指向して設け、前記結合フラン
ジまたは相手方取付面に、前記締結結合時に、前記シー
ルフランジの外周端縁を半径方向外側で係止する係合部
を設けたことを特徴とする。The invention according to claim 1 is
In an exhaust pipe connecting structure, an exhaust pipe having a coupling flange around an end portion is arranged in accordance with an exhaust port, and the coupling flange is fastened and coupled to a mating mounting surface around the exhaust port,
A tubular collar main body inserted in a loosely fitted state from the exhaust port side to the exhaust pipe side is provided, and an outer periphery of the collar main body is provided between the coupling flange and the mating mounting surface. Fixed to the inner circumference of the seal flange, the seal flange is formed in a corrugated plate shape from the inner circumference side to the outer circumference side, and is the lowest in the free state radially inward, and the highest in the middle section. A second corrugation, a third corrugation lower than the second corrugation on the same outer side, and an outer peripheral edge directed toward the coupling flange or the mating mounting surface, and the coupling flange or mating mounting The surface is provided with an engaging portion that locks the outer peripheral edge of the seal flange at the outer side in the radial direction during the fastening connection.
【００１４】請求項２記載の発明は、請求項１記載の排
気管の接続構造であって、前記カラー本体に対して排気
下流側に、触媒を有し、前記カラー本体の端部が前記触
媒に向けられていることを特徴とする。According to a second aspect of the present invention, there is provided the exhaust pipe connecting structure according to the first aspect, wherein a catalyst is provided on an exhaust downstream side of the collar body, and an end portion of the collar body is the catalyst. Is characterized by being directed to.
【００１５】請求項３記載の発明は、筒状のカラー本体
の外周に、環状のシールフランジの内周側を固定し、前
記シールフランジを、内周側から外周側にかけて波板状
に形成して半径方向内側に自由状態で最も低い第１の波
部、同中間部に同最も高い第２の波部、同外側に同第２
の波部より低い第３の波部を設け、かつ、外周端縁をカ
ラー本体の軸方向側へ指向させたことを特徴とする。According to a third aspect of the invention, the inner peripheral side of the annular seal flange is fixed to the outer periphery of the tubular collar body, and the seal flange is formed in a corrugated plate shape from the inner peripheral side to the outer peripheral side. In the radial direction, the first wave portion is lowest in the free state, the second wave portion is highest in the middle portion, and the second wave portion is in the outer side.
A third corrugation lower than the corrugation is provided, and the outer peripheral edge is directed toward the axial direction side of the collar body.
【００１６】[0016]
【作用】請求項１記載の発明においては、シールフラン
ジの内周を例えば溶接等によりカラー本体の外周に接合
する。組付け（締結結合）時は、最も高い第２の波部が
取付面と結合フランジとに当接して圧縮変形し、次いで
第２の波部よりも低い第３の波部が取付面と結合フラン
ジに当接して圧縮変形している。シールフランジの外周
端縁が取付面または結合フランジに設けられた係合部に
係止すると、第３の波部の変形が制限される結果、締結
結合時には、取付面と結合フランジに対し、第２の波
部、第３の波部のみ当接し、最も低い第１の波部は当接
しない。一方、排気ガスを流通させた結果、カラー本体
が熱拡張した場合、カラー本体に最も近い第１の波部が
他の波部に比べ最も低いため、取付面と結合フランジに
対し当接しておらず、従ってカラー本体の熱拡張は第１
の波部に吸収される。また取付面と結合フランジに当接
している第２，第３の波部が線接触のシール部材とな
り、伝熱面積が非常に小さい状態でガス漏れを防止す
る。According to the first aspect of the invention, the inner circumference of the seal flange is joined to the outer circumference of the collar body by, for example, welding. At the time of assembling (fastening connection), the highest second corrugation comes into contact with the mounting surface and the coupling flange for compression deformation, and then the third corrugation lower than the second corrugation couples to the mounting surface. It comes into contact with the flange and is compressed and deformed. When the outer peripheral edge of the seal flange is locked to the engaging portion provided on the mounting surface or the coupling flange, the deformation of the third corrugated portion is limited. Only the second corrugation and the third corrugation are in contact, and the lowest first corrugation is not in contact. On the other hand, when the collar body thermally expands as a result of circulating exhaust gas, the first corrugation closest to the collar body is the lowest compared to the other corrugations, so contact the mounting surface and the coupling flange. Therefore, the thermal expansion of the collar body is the first
Is absorbed by the wave part of. Further, the second and third corrugations that are in contact with the mounting surface and the coupling flange serve as line-contact seal members to prevent gas leakage in a state where the heat transfer area is very small.
【００１７】請求項２記載の発明においては、カラー本
体の端部が触媒に向けられているため、カラーを通過し
た排気ガスは触媒周囲の排気管の低温壁に接触せず、高
温のまま触媒中心部へ拡散せずに流入する。このため触
媒中心の温度は素早く活性温度を越えて高くなることが
可能になる。According to the second aspect of the present invention, since the end portion of the collar main body is directed toward the catalyst, the exhaust gas passing through the collar does not come into contact with the low temperature wall of the exhaust pipe around the catalyst, and the catalyst remains at a high temperature. It flows into the center without diffusion. As a result, the temperature at the center of the catalyst can quickly rise above the activation temperature and rise.
【００１８】請求項３記載の発明においては、排気口側
から排気管側へ筒状のカラー本体を挿入した状態で、カ
ラー本体の外周にあるシールフランジを排気口周囲の取
付面と排気管の結合フランジとの間で例えばボルトによ
り締結結合する。これによりカラーの組付けが完了す
る。According to the third aspect of the invention, with the tubular collar body inserted from the exhaust port side to the exhaust pipe side, the seal flange on the outer periphery of the collar body is attached to the mounting surface around the exhaust port and the exhaust pipe. For example, bolts are fastened and coupled to the coupling flange. This completes the color assembly.
【００１９】[0019]
【実施例】以下、本発明を図示の実施例に基づいて説明
する。The present invention will be described below with reference to the illustrated embodiments.
【００２０】図１（ａ）は本発明の実施例に係わる排気
管接続用カラーの断面図、同図（ｂ）はその上面図であ
る。排気管接続用カラー５１のカラー本体５２は円筒状
に形成されている。カラー本体５２の略中央の円周上に
はシールフランジ５３が例えば溶接等により配設されて
いる。シールフランジ５３は、カラー本体５２との接続
部分が円環状の板材５４となっており、円環状の板材５
４の半径方向外側には、円環状の第１，第２，第３の波
部Ａ，Ｂ，Ｃが設けられている。FIG. 1 (a) is a sectional view of an exhaust pipe connecting collar according to an embodiment of the present invention, and FIG. 1 (b) is a top view thereof. The collar main body 52 of the exhaust pipe connecting collar 51 is formed in a cylindrical shape. A seal flange 53 is arranged by welding or the like on the circumference of the collar main body 52 substantially at the center. The seal flange 53 has an annular plate member 54 at the connecting portion with the collar body 52.
Ring-shaped first, second, and third wave portions A, B, and C are provided on the outer side in the radial direction of 4.
【００２１】即ち詳細には、板材５４の半径方向外側に
は図示下方へ突設する波の凸部５５が形成され、波の凸
部５５の半径方向外側には図示上方へ突設する波の凸部
５６が形成されており、この上下１組の波の凸部５５，
５６で半径方向内側の第１の波部Ａが形成されている。
また波の凸部５６の半径方向外側には図示下方へ吐出す
る波の凸部５７が形成され、波の凸部５７の半径方向外
側には図示上方へ突設する波の凸部５８が形成されてお
り、この上下１組の波の凸部５７，５８で半径方向中間
部の第２の波部Ｂが形成されている。また波の凸部５８
の半径方向外側には図示下方へ突設する波の凸部５９が
形成され、この波の凸部５９により半径方向外側の第３
の波部Ｃが形成されている。尚、波の凸部５９の半径方
向外側には波の凸部５９と共に第３の波部Ｃを形成すべ
き一点鎖線で示す波の凸部５９aが形成されるべきであ
るが、本実施例では削除され、シールフランジ５３の外
周縁となる外周端縁６０が形成されている。More specifically, the wave convex portion 55 protruding downward in the drawing is formed on the outer side in the radial direction of the plate member 54, and the wave convex portion protruding upward in the drawing is formed on the outer side in the radial direction of the wave convex portion 55. A convex portion 56 is formed, and a pair of upper and lower wave convex portions 55,
At 56, the first wave portion A on the inner side in the radial direction is formed.
Further, a wave convex portion 57 ejected downward in the drawing is formed on the outer side in the radial direction of the wave convex portion 56, and a wave convex portion 58 protruding upward in the figure is formed on the outer side in the radial direction of the wave convex portion 57. The pair of upper and lower wave convex portions 57 and 58 form a second corrugated portion B which is an intermediate portion in the radial direction. In addition, the wave convex portion 58
A wave convex portion 59 protruding downward in the drawing is formed on the outer side in the radial direction.
The corrugated portion C is formed. It should be noted that a wave convex portion 59a indicated by a dot-dash line which should form the third wave portion C together with the wave convex portion 59 should be formed on the outer side of the wave convex portion 59 in the radial direction. Then, the outer peripheral edge 60 which is the outer peripheral edge of the seal flange 53 is formed.
【００２２】ここで、第１の波部Ａの全高は自由状態で
最も低いＨ1 の寸法にあり、第２の波部Ｂの全高は自由
状態で最も高いＨ2 の寸法にあり、第３の波部Ｃの全高
は自由状態でＨ1 よりも高く、Ｈ2 よりも低い中間の寸
法Ｈ3 にある。尚、第３の波部Ｃの高さＨ3 は凸部５９
と仮想の凸部５９a との間での高さを考えている。第３
の波部Ｃから突出する外周端縁６０の高さは波の凸部５
８と同じ高さである。またこの外周端縁６０は半径方向
に対して鋭角なる角度αで延伸し傾いている。Here, the total height of the first wave portion A is at the lowest dimension H 1 in the free state, the total height of the second wave portion B is at the highest dimension H 2 in the free state, and the third The total height of the corrugation C of C is higher than H 1 in the free state and lower than H 2 at an intermediate dimension H 3 . In addition, the height H 3 of the third wave portion C is determined by the convex portion 59.
The height between the virtual convex portion 59a and the virtual convex portion 59a is considered. Third
The height of the outer peripheral edge 60 protruding from the wave portion C of the
It is the same height as 8. Further, the outer peripheral edge 60 extends and is inclined at an angle α which is an acute angle with respect to the radial direction.
【００２３】尚、排気管接続用カラー５１のカラー本体
５２は、詳しくは後述するが、波部の配列の関係で図示
下半分が排気ガス流の上流側となり、図示上半分が下流
側となる。The collar main body 52 of the exhaust pipe connecting collar 51 will be described in detail later, but the lower half in the figure is the upstream side of the exhaust gas flow and the upper half in the figure is the downstream side due to the arrangement of the wave portions. .
【００２４】図２は本発明の実施例に係わる排気管のボ
ルト締付け途中の状態を示す断面図である。シリンダヘ
ッド６１には、弁６２が配置される排気通路６３が形成
され、排気通路６３の端部に排気口６３a が形成されて
いる。排気口６３a 周囲におけるシリンダヘッド６１の
側面が取付面（相手方取付面）６３b となっている。前
記排気管６４は、前記排気口６３a に合わせて配置さ
れ、結合フランジ６５が前記取付面６３b にボルト６６
によって締結結合される構成となっている。結合フラン
ジ６５には段状の係合部６７が設けられている。一方、
前記カラー本体５２は排気口６３a 側から排気管６４側
へ渡って遊嵌状態で挿入されている。即ちシリンダヘッ
ド６１の排気口６３a 側には排気管接続用カラー５１の
カラー本体５２の上流側が挿入され、排気管６４内に
は、同下流側が挿入されている。シリンダヘッド６１の
取付面６３b と排気管６４の結合フランジ６５との間に
は、排気管接続用カラー５１のシールフランジ５３が介
設されている。FIG. 2 is a sectional view showing a state in which the exhaust pipe according to the embodiment of the present invention is being bolted. An exhaust passage 63 in which the valve 62 is arranged is formed in the cylinder head 61, and an exhaust port 63a is formed at an end of the exhaust passage 63. The side surface of the cylinder head 61 around the exhaust port 63a serves as a mounting surface (counterpart mounting surface) 63b. The exhaust pipe 64 is arranged to match the exhaust port 63a, and the coupling flange 65 is attached to the mounting surface 63b by a bolt 66.
It is configured to be fastened and coupled by. The coupling flange 65 is provided with a stepped engagement portion 67. on the other hand,
The collar main body 52 is loosely inserted from the exhaust port 63a side to the exhaust pipe 64 side. That is, the upstream side of the collar body 52 of the exhaust pipe connecting collar 51 is inserted into the exhaust port 63a side of the cylinder head 61, and the downstream side thereof is inserted into the exhaust pipe 64. A seal flange 53 of the exhaust pipe connecting collar 51 is provided between the mounting surface 63b of the cylinder head 61 and the coupling flange 65 of the exhaust pipe 64.
【００２５】この状態では、図３にも示す通り、シール
フランジ５３の第１，第２，第３の波部Ａ，Ｂ，Ｃのう
ち、半径方向中間部の第２の波部Ｂの凸部５７，５８が
シリンダヘッド６１の取付面６３b に当接している。従
って、このボルト締結途中では、第２の波部Ｂが結合フ
ランジ６５と取付面６３b との間に挟持され、排気管接
続用カラー５１の位置決めが行われている。前記シール
フランジ６３の外周端縁６０は、前記係合部６７に半径
方向へ対向している。In this state, as also shown in FIG. 3, of the first, second, and third corrugations A, B, and C of the seal flange 53, the convex portion of the second corrugation B at the radial middle portion. The parts 57 and 58 are in contact with the mounting surface 63b of the cylinder head 61. Therefore, during the fastening of the bolt, the second corrugated portion B is sandwiched between the coupling flange 65 and the mounting surface 63b, and the exhaust pipe connecting collar 51 is positioned. The outer peripheral edge 60 of the seal flange 63 faces the engaging portion 67 in the radial direction.
【００２６】図４は本発明の実施例に係わる排気管のボ
ルト締付け後の状態を示す断面図である。ボルト６６を
シリンダヘッド６１に所定位置まで深く螺入させ、シリ
ンダヘッド６１の取付面６３b と排気管６４の結合フラ
ンジ６５とで排気管接続用カラー５１のシールフランジ
５３を強く挟持している。この場合、シールフランジ５
３は、特に第２の波部Ｂの凸部５７，５８が取付面６３
b 及び結合フランジ６５間で押圧されて変形して半径方
向内側及び外側へそれぞれ展伸する。しかし半径方向内
側での変形量は凸部５７，５８により位置が最初に規定
されているため、変形量はそれほど大きくならず、半径
方向外側では第３の波部Ｃの凸部５９へと外側へ向かっ
て順次圧縮されて行き、凸部５９もシリンダヘッド６１
の取付面６３b に当接する。そして外周端縁６０が外側
へ展伸して結合フランジ６５の係合部６７に当接し停止
する。FIG. 4 is a sectional view showing a state of the exhaust pipe according to the embodiment of the present invention after the bolt is tightened. The bolt 66 is deeply screwed into the cylinder head 61 to a predetermined position, and the seal flange 53 of the exhaust pipe connecting collar 51 is strongly sandwiched between the mounting surface 63b of the cylinder head 61 and the coupling flange 65 of the exhaust pipe 64. In this case, the seal flange 5
3, the convex portions 57 and 58 of the second corrugated portion B are particularly attached to the mounting surface 63.
It is pressed between b and the coupling flange 65 to be deformed and spread radially inward and outward. However, since the position of the deformation amount on the inner side in the radial direction is first defined by the protrusions 57 and 58, the amount of deformation does not increase so much, and on the outer side in the radial direction, the protrusion 59 of the third corrugated portion C is outside. The projection 59 is also compressed toward the cylinder head 61.
Abuts on the mounting surface 63b. Then, the outer peripheral edge 60 expands outward and comes into contact with the engaging portion 67 of the coupling flange 65 to stop.
【００２７】こうして、図５にも示す通り、シールフラ
ンジ５３の第１，第２，第３の波部Ａ，Ｂ，Ｃのうち、
半径方向中間部の第２の波部Ｂの凸部５７と第３の波部
Ｃの凸部５９とがシリンダヘッド６１の取付面６３b に
当接し、第２の波部Ｂの凸部５８と外周端縁６０とが結
合フランジ６５に当接している。これにより圧力が高い
上流側では二段（５７，５９）のシールでガス漏れを防
止することになり、確実なシールを行うことになる。
尚、下流側でも凸部５８の外、外周端縁６０がシール作
用に寄与し、確実なシールを行うことができる。Thus, as shown in FIG. 5, among the first, second, and third corrugations A, B, C of the seal flange 53,
The convex portion 57 of the second corrugated portion B and the convex portion 59 of the third corrugated portion C in the middle portion in the radial direction come into contact with the mounting surface 63b of the cylinder head 61, and the convex portion 58 of the second corrugated portion B is formed. The outer peripheral edge 60 is in contact with the coupling flange 65. As a result, on the upstream side where the pressure is high, gas leakage is prevented by a two-stage (57, 59) seal, and reliable sealing is performed.
Even on the downstream side, the outer peripheral edge 60 in addition to the convex portion 58 contributes to the sealing action, and reliable sealing can be performed.
【００２８】この排気管を排気ガスが通過する場合、排
気管接続用カラー５１のカラー本体５２がシリンダヘッ
ド６１の取付面６３b と排気管６４の結合フランジ６５
を跨いで両排気通路内へ延伸しているため、排気ガス
は、排気管接続用カラー５１のカラー本体５２内を通過
し、排気管６４の結合フランジ６５近傍の低温の排気通
路に接触することなく、下流側の触媒（図示せず）へ流
れる。When the exhaust gas passes through the exhaust pipe, the collar body 52 of the exhaust pipe connecting collar 51 is connected to the mounting surface 63b of the cylinder head 61 and the connecting flange 65 of the exhaust pipe 64.
The exhaust gas passes through the inside of the collar body 52 of the exhaust pipe connecting collar 51 and contacts the low temperature exhaust passage in the vicinity of the coupling flange 65 of the exhaust pipe 64 because it extends into both exhaust passages. Instead, it flows to the downstream catalyst (not shown).
【００２９】特に、本実施例においては、シリンダヘッ
ド６１の取付面６３b 及び排気管６４の結合フランジ６
５間では、シールフランジ５３によるシールが円環状の
線接触となっているため、排気管接続用カラー５１から
結合フランジ６５への熱移動量が少なく、排気管接続用
カラー５１の本体部５２の表面温度は高く保たれ、排気
ガスの冷却は抑制される。従って、排気ガスの保温効果
が高く、始動時等でも触媒の化学反応を促進させること
ができる。また排気管６４の結合フランジ６５とシリン
ダヘッド６１との間の伝熱面積も同様に非常に小さいも
のとなり、排気管６４からシリンダヘッド６１への伝導
伝熱量も低減される。このためシリンダヘッド６１の高
温化をも回避することができ、車両の熱地での高負荷走
行時にエンジン作動温度を低くすることが可能になる。Particularly, in this embodiment, the mounting surface 63b of the cylinder head 61 and the coupling flange 6 of the exhaust pipe 64 are connected.
Since the seal by the seal flange 53 is an annular line contact between the five, the amount of heat transfer from the exhaust pipe connecting collar 51 to the coupling flange 65 is small, and the main body portion 52 of the exhaust pipe connecting collar 51 is The surface temperature is kept high and the cooling of the exhaust gas is suppressed. Therefore, the heat retention effect of the exhaust gas is high, and the chemical reaction of the catalyst can be promoted even at the time of starting. Further, the heat transfer area between the coupling flange 65 of the exhaust pipe 64 and the cylinder head 61 is also very small, and the amount of conductive heat transfer from the exhaust pipe 64 to the cylinder head 61 is also reduced. For this reason, it is possible to prevent the temperature of the cylinder head 61 from rising, and it is possible to reduce the engine operating temperature during high-load traveling in a hot place of the vehicle.
【００３０】さらに排気管接続用カラー５１のカラー本
体５２が熱拡張により変形しても、最も内側の第１の波
部Ａがシリンダヘッド６１の取付面６３b 及び結合フラ
ンジ６５に接触しないフリーの状態となっているため、
第１の波部Ａが前記の変形を吸収し、亀裂等の損傷に至
ることはない。Further, even when the collar body 52 of the exhaust pipe connecting collar 51 is deformed by thermal expansion, the innermost first wave portion A does not come into contact with the mounting surface 63b of the cylinder head 61 and the coupling flange 65. Since,
The first wave portion A absorbs the above deformation and does not lead to damage such as cracks.
【００３１】図６は本発明の第２の実施例に係わる排気
管を示す断面図である。尚、図２と同一部分には同一符
号を付して説明を省略する。本実施例の排気管接続用カ
ラー７１はそのシールフランジ５３が上流側排気管８１
の結合フランジ８２と下流側排気管８３の結合フランジ
８４との間に挟持されるものである。従って、本実施例
では、上流側の結合フランジ８２の取付面８２a が相手
方取付面となる。本実施例の排気管接続用カラー７１の
カラー本体７２は上述したシールフランジ５３を備えて
いる他、カラー本体７２の下流側の端部７２a が触媒７
３へ向けて湾曲形成され、その流路中心が触媒７３の中
心部へ向かっている。これにより排気管接続用カラー７
１のカラー本体７２を通過した排気ガスは触媒ハウジン
グの低温壁に接触せず、高温のまま拡散せずに触媒中心
部へ流入することになる。FIG. 6 is a sectional view showing an exhaust pipe according to the second embodiment of the present invention. The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. In the exhaust pipe connecting collar 71 of the present embodiment, the seal flange 53 is located on the upstream side exhaust pipe 81.
It is sandwiched between the connecting flange 82 and the connecting flange 84 of the downstream exhaust pipe 83. Therefore, in this embodiment, the mounting surface 82a of the coupling flange 82 on the upstream side becomes the mating mounting surface. The collar main body 72 of the exhaust pipe connecting collar 71 of this embodiment is provided with the above-mentioned seal flange 53, and the downstream end 72a of the collar main body 72 is the catalyst 7.
It is curved toward 3, and the center of the flow path is toward the center of the catalyst 73. This allows the exhaust pipe connection collar 7
The exhaust gas that has passed through the first color main body 72 does not come into contact with the low temperature wall of the catalyst housing, and flows into the center of the catalyst without being diffused at high temperature.
【００３２】図７は本実施例の触媒温度を従来のものと
比較した実験結果を示している。線分で示す従来では
温度分布が触媒の中心から外周部にかけて略均一で触媒
中心の温度が低く活性化温度に達しないのに対して、線
分で示す本実施例では触媒中心の温度が活性化温度を
越えて高くなることが確認できた。従って、本実施例の
排気管では触媒中心部が早い時期に活性化温度に達し、
触媒の反応熱を利用した温度上昇効果が得られることに
なる。FIG. 7 shows the result of an experiment comparing the catalyst temperature of this example with that of the conventional catalyst. In the conventional case shown by the line segment, the temperature distribution is substantially uniform from the center of the catalyst to the outer peripheral portion and the temperature of the catalyst center is low and does not reach the activation temperature, whereas in the present example shown by the line segment, the temperature of the catalyst center is active. It was confirmed that the temperature became higher than the oxidization temperature. Therefore, in the exhaust pipe of this example, the catalyst center reaches the activation temperature at an early stage,
A temperature increasing effect using the reaction heat of the catalyst can be obtained.
【００３３】他の効果は上記実施例と略同様である。Other effects are substantially the same as those of the above embodiment.
【００３４】尚、シールフランジ５３の外周端縁６０を
係止する係合部６７は、取付面６３b 、８２a 側に設け
ることもできる。この場合、外周端縁６０は、取付面６
３b、８２a 側へ指向することとなる。また第１，第
２，第３の波部Ａ，Ｂ，Ｃはその凸部をさらに増加させ
ることもでき、その数も各波部Ａ，Ｂ，Ｃで同一とする
必要もない。The engaging portion 67 for locking the outer peripheral edge 60 of the seal flange 53 may be provided on the mounting surfaces 63b, 82a side. In this case, the outer peripheral edge 60 is attached to the mounting surface 6
It will be directed to the 3b, 82a side. The convex portions of the first, second, and third wave portions A, B, C can be further increased, and the number of wave portions A, B, C need not be the same.
【００３５】[0035]
【発明の効果】請求項１記載の発明によれば、シールフ
ランジが、内周側から外周側にかけて波板状に形成され
ており、伝熱面積の縮小化により、安定した断熱効果で
排気ガスの保温効果を向上させることができる。また半
径方向内側に自由状態で最も低い第１の波部が設けられ
ているため、第１の波部は相手方取付面にも排気管の結
合フランジ部にも当接せず、カラー本体の熱拡張を第１
の波部で吸収し、亀裂の発生を抑制することができる。
さらに取付面には、シールフランジの外周端縁が結合フ
ランジの係合部に係合するため、シールフランジを締結
結合により容易に固定し、カラーの取付けが完了するか
ら、少ない部品点数でカラーの組付けを容易にすること
ができる。According to the invention of claim 1, the seal flange is formed in a corrugated plate shape from the inner peripheral side to the outer peripheral side, and the exhaust gas is stabilized with a heat insulating effect by reducing the heat transfer area. The heat retention effect of can be improved. Further, since the lowest first wave portion in the free state is provided on the inner side in the radial direction, the first wave portion does not abut on the mating mounting surface or the coupling flange portion of the exhaust pipe, and the heat of the collar main body is not contacted. Expansion first
It can be absorbed by the corrugated part and the occurrence of cracks can be suppressed.
Furthermore, since the outer peripheral edge of the seal flange engages with the engaging portion of the coupling flange on the mounting surface, the seal flange can be easily fixed by fastening and the collar mounting is completed. Assembly can be facilitated.
【００３６】請求項２記載の発明によれば、請求項１記
載の発明の効果に加えて、カラー本体の端部を触媒に向
けているため、カラー本体を通過した排気ガスが触媒ハ
ウジングの低温壁に接触するのが抑制され、高温のまま
触媒中心部へ流入する。このため触媒中心の温度は素早
く活性温度を越えて高くなることが可能になる。According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the end of the collar body is directed toward the catalyst, the exhaust gas passing through the collar body has a low temperature in the catalyst housing. The contact with the wall is suppressed, and it flows into the center of the catalyst at a high temperature. As a result, the temperature at the center of the catalyst can quickly rise above the activation temperature and rise.
【００３７】請求項３記載の発明によれば、請求項１記
載の構造に用いる排気管接続用カラーが得られる。According to the invention of claim 3, the exhaust pipe connecting collar used in the structure of claim 1 can be obtained.
【図１】本発明の実施例に係わるカラーの構造を説明す
る説明図である。FIG. 1 is an explanatory view illustrating a structure of a collar according to an embodiment of the present invention.
【図２】本発明の第１の実施例に係わる排気管のボルト
締付け前の状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state of an exhaust pipe according to a first embodiment of the present invention before bolt tightening.
【図３】本発明の第１の実施例に係わる排気管の要部の
ボルト締付け前の状態を示す要部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part of the exhaust pipe according to the first embodiment of the present invention showing a state before tightening the bolt.
【図４】本発明の第１の実施例に係わる排気管のボルト
締付け後の状態を示す断面図である。FIG. 4 is a cross-sectional view showing a state after tightening bolts of the exhaust pipe according to the first embodiment of the present invention.
【図５】本発明の第１の実施例に係わる排気管の要部の
ボルト締付け後の状態を示す要部拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a main portion of the exhaust pipe according to the first embodiment of the present invention, showing a state after tightening the bolt.
【図６】本発明の第２の実施例に係わる排気管の構成を
示す断面図である。FIG. 6 is a sectional view showing a structure of an exhaust pipe according to a second embodiment of the present invention.
【図７】本発明の第２の実施例に係わる排気管による触
媒温度特性を示すグラフである。FIG. 7 is a graph showing a catalyst temperature characteristic of an exhaust pipe according to a second embodiment of the present invention.
【図８】従来の排気管の構成を示す断面図である。FIG. 8 is a cross-sectional view showing a configuration of a conventional exhaust pipe.
【図９】図８に示す従来の排気管の温度特性を示すグラ
フである。9 is a graph showing temperature characteristics of the conventional exhaust pipe shown in FIG.
【図１０】従来の他の排気管の構成を示す断面図であ
る。FIG. 10 is a cross-sectional view showing the configuration of another conventional exhaust pipe.
【図１１】従来のさらに他の排気管の構成を示す断面図
である。FIG. 11 is a sectional view showing the structure of still another conventional exhaust pipe.
【図１２】従来のさらに他の排気管の構成を示す断面図
である。FIG. 12 is a sectional view showing the structure of still another conventional exhaust pipe.
５１ 排気管接続用カラー ５２ カラー本体 ５３ シールフランジ ５４ 円環状の板材 Ａ 第１の波部 Ｂ 第２の波部 Ｃ 第３の波部 ６０ 外周端縁 ６１ シリンダヘッド ６３ 排気通路 ６３a 排気口 ６３b 相手方取付面 ６４ 排気管 ６５ 結合フランジ ６７ 係合部 ７１ 排気管接続用カラー ７２ カラー本体 ７３ 触媒 ８１ 排気管 ８２ 結合フランジ ８２a 相手方取付面 ８３ 排気管 ８４ 結合フランジ 51 Exhaust Pipe Connection Collar 52 Collar Main Body 53 Seal Flange 54 Annular Plate Material A First Corrugation B Second Corrugation C Third Corrugation 60 Outer Edge 61 Cylinder Head 63 Exhaust Passage 63a Exhaust Port 63b Counterpart Mounting surface 64 Exhaust pipe 65 Coupling flange 67 Engaging portion 71 Exhaust pipe connecting collar 72 Color body 73 Catalyst 81 Exhaust pipe 82 Combining flange 82a Opposite mounting surface 83 Exhaust pipe 84 Combining flange
Claims (3)
を、排気口に合わせて配置し、前記結合フランジを前記
排気口周囲の相手方取付面に締結結合する排気管の接続
構造において、 前記排気口側から前記排気管側へ渡って遊嵌状態で挿入
された筒状のカラー本体を設け、 前記カラー本体の外周を、前記結合フランジと相手方取
付面との間に介設される環状のシールフランジの内周に
固定し、 前記シールフランジを、内周側から外周側にかけて波板
状に形成して半径方向内側に自由状態で最も低い第１の
波部、同中間部に最も高い第２の波部、同外側に同第２
の波部より低い第３の波部を設け、かつ、外周端縁を前
記結合フランジまたは相手方取付面に指向して設け、 前記結合フランジまたは相手方取付面に、前記締結結合
時に、前記シールフランジの外周端縁を半径方向外側で
係止する係合部を設けた、 ことを特徴とする排気管の接続構造。1. An exhaust pipe connecting structure in which an exhaust pipe having a coupling flange around an end portion is arranged in accordance with an exhaust port, and the coupling flange is fastened and coupled to a mating mounting surface around the exhaust port, A tubular collar main body inserted loosely from the exhaust port side to the exhaust pipe side is provided, and an outer periphery of the collar main body is an annular shape provided between the coupling flange and the mating mounting surface. It is fixed to the inner circumference of the seal flange, and the seal flange is formed in a corrugated plate shape from the inner circumference side to the outer circumference side, and the first corrugated portion is the lowest in the free state radially inward and the highest corrugated portion is in the middle portion. 2 corrugated part, 2nd part on the same outside
A third corrugation lower than the corrugation, and the outer peripheral edge is provided so as to be oriented toward the coupling flange or the mating mounting surface, and the coupling flange or the mating mounting surface is provided with the seal flange An exhaust pipe connecting structure, characterized in that an engaging portion for locking the outer peripheral edge radially outward is provided.
て、前記カラー本体に対して排気下流側に、触媒を有
し、前記カラー本体の端部が前記触媒に向けられてい
る、 ことを特徴とする排気管の接続構造。2. The exhaust pipe connection structure according to claim 1, further comprising a catalyst on an exhaust downstream side with respect to the collar body, and an end portion of the collar body facing the catalyst. Exhaust pipe connection structure characterized by
ルフランジの内周側を固定し、 前記シールフランジを、内周側から外周側にかけて波板
状に形成して半径方向内側に自由状態で最も低い第１の
波部、同中間部に同最も高い第２の波部、同外側に同第
２の波部より低い第３の波部を設け、かつ、外周端縁を
カラー本体の軸方向側へ指向させた、 ことを特徴とする排気管接続用カラーの構造。3. An inner peripheral side of an annular seal flange is fixed to the outer periphery of a tubular collar body, and the seal flange is formed in a corrugated plate shape from the inner peripheral side to the outer peripheral side and is free inward in the radial direction. In the state, the first corrugated part is lowest, the second corrugated part is highest in the middle part, the third corrugated part is lower than the second corrugated part in the outer side, and the outer peripheral edge is the collar body. The structure of the collar for connecting the exhaust pipe is characterized by being oriented toward the axial side of the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30661893A JPH07158436A (en) | 1993-12-07 | 1993-12-07 | Exhaust pipe connecting structure and exhaust pipe connecting collar structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30661893A JPH07158436A (en) | 1993-12-07 | 1993-12-07 | Exhaust pipe connecting structure and exhaust pipe connecting collar structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07158436A true JPH07158436A (en) | 1995-06-20 |
Family
ID=17959254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30661893A Pending JPH07158436A (en) | 1993-12-07 | 1993-12-07 | Exhaust pipe connecting structure and exhaust pipe connecting collar structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07158436A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014672A (en) * | 2015-03-30 | 2016-10-12 | 本田技研工业株式会社 | Exhaust passage structure of internal combustion engine |
| CN109281745A (en) * | 2018-11-29 | 2019-01-29 | 汽解放汽车有限公司 | Heat-insulated cumulative bushing type exhaust pipe and cylinder cover attaching structure |
| CN109458250A (en) * | 2018-12-20 | 2019-03-12 | 宁波盛昕能源有限公司 | A kind of new energy turbogenerator |
-
1993
- 1993-12-07 JP JP30661893A patent/JPH07158436A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014672A (en) * | 2015-03-30 | 2016-10-12 | 本田技研工业株式会社 | Exhaust passage structure of internal combustion engine |
| JP2016188585A (en) * | 2015-03-30 | 2016-11-04 | 本田技研工業株式会社 | Exhaust passage structure for internal combustion engine |
| CN109281745A (en) * | 2018-11-29 | 2019-01-29 | 汽解放汽车有限公司 | Heat-insulated cumulative bushing type exhaust pipe and cylinder cover attaching structure |
| CN109458250A (en) * | 2018-12-20 | 2019-03-12 | 宁波盛昕能源有限公司 | A kind of new energy turbogenerator |
| CN109458250B (en) * | 2018-12-20 | 2020-11-27 | 阜阳市鼎铭汽车配件制造有限公司 | New energy turbine engine |
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