JP2001304466A - Coupling pipe - Google Patents
Coupling pipeInfo
- Publication number
- JP2001304466A JP2001304466A JP2000124334A JP2000124334A JP2001304466A JP 2001304466 A JP2001304466 A JP 2001304466A JP 2000124334 A JP2000124334 A JP 2000124334A JP 2000124334 A JP2000124334 A JP 2000124334A JP 2001304466 A JP2001304466 A JP 2001304466A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- folded
- enlarged diameter
- connecting pipe
- holding member
- 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.)
- Withdrawn
Links
Landscapes
- Exhaust Silencers (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば内燃機関の
排気マニホールド等に採用される連結管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting pipe used for an exhaust manifold of an internal combustion engine, for example.
【０００２】[0002]
【従来の技術】通常、上記排気マニホールドは、複数の
管体が連結されてなり、それらの連結部に、排気ガスの
熱による管体自身の熱膨張及び熱収縮を吸収するための
機構が備えられている。そして従来、この吸収機構を備
えた連結管としては、例えば実開昭６３―１１２２１９
号公報に記載されたものが知られている。2. Description of the Related Art Generally, a plurality of pipes are connected to an exhaust manifold, and a mechanism for absorbing thermal expansion and thermal contraction of the pipes themselves due to heat of exhaust gas is provided at a connection portion between the pipes. Have been. Conventionally, as a connecting pipe provided with this absorbing mechanism, for example, Japanese Utility Model Laid-Open No. 63-112219
Japanese Unexamined Patent Publication (Kokai) No. H10-264, pp. 157-334 is known.
【０００３】この公報に記載される連結管は図１１に示
されるように、その連結部において、一方の管体１０１
と他方の管体１０２とがジャバラ１０３を介して接続さ
れている。詳しくは、ジャバラ１０３の一端１０３ａに
は、管体１０２がジャバラ１０３の内周面に当接して摺
動可能に挿入されるとともに、同ジャバラ１０３の外周
面には、これを管体１０２側に付勢する円筒状の付勢部
材１０４が挿入されている。一方、ジャバラ１０３の他
端１０３ｂには、管体１０１がジャバラ１０３の内周面
に当接して挿入されるとともに、これらジャバラ１０３
の他端１０３ｂと一方の管体１０１とは溶接によって固
定されている。As shown in FIG. 11, a connecting pipe described in this publication has one connecting pipe 101 at its connecting portion.
And the other pipe 102 are connected via bellows 103. Specifically, the pipe body 102 is slidably inserted into one end 103a of the bellows 103 by abutting against the inner peripheral surface of the bellows 103, and is inserted into the outer peripheral surface of the bellows 103 toward the pipe body 102 side. A cylindrical urging member 104 for urging is inserted. On the other hand, the pipe body 101 is inserted into the other end 103b of the bellows 103 in contact with the inner peripheral surface of the bellows 103, and the bellows 103
Is fixed to the other end 103b by welding.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記吸収機
構は、ジャバラ１０３の一端１０３ａが管体１０２に対
して摺動することにより、その伸縮が可能とはなってい
るものの、次のような問題も無視できないものとなって
いる。The above-mentioned absorbing mechanism can be expanded and contracted by sliding one end 103a of the bellows 103 with respect to the tube 102, but has the following problem. Are not negligible.
【０００５】すなわち、この連結管にあっては、付勢部
材１０４の付勢力によりジャバラ１０３の一端１０３ａ
と管体１０２との連結部におけるシール性が確保される
反面、この付勢力によって管体１０２が縮径する方向に
変形し易くなる。こうした変形が管体１０２に発生する
と、ジャバラ１０３の一端１０３ａが管体１０２の外周
面に沿って摺動し難くなり、熱膨張や熱収縮する際の連
結管の伸縮が適切に吸収されなくなる。その結果、過大
な熱応力に起因した亀裂等の発生を招くおそれがある。That is, in this connecting tube, one end 103 a of the bellows 103 is pressed by the urging force of the urging member 104.
While the sealing property at the connecting portion between the pipe 102 and the pipe 102 is ensured, the urging force tends to cause the pipe 102 to be deformed in the direction in which the diameter is reduced. When such deformation occurs in the tubular body 102, one end 103a of the bellows 103 becomes difficult to slide along the outer peripheral surface of the tubular body 102, and expansion and contraction of the connecting pipe during thermal expansion and thermal contraction cannot be properly absorbed. As a result, cracks and the like due to excessive thermal stress may occur.
【０００６】なお、上述した内燃機関の排気マニホール
ドに限らず、冷熱サイクルの繰り返し等に起因する管体
自身の伸縮が無視できない環境に用いられる連結管にあ
っては、こうした実情も概ね共通したものとなってい
る。[0006] Not only the exhaust manifold of the internal combustion engine described above, but also a connecting pipe used in an environment where expansion and contraction of the pipe itself due to repetition of a cooling / heating cycle cannot be ignored. It has become.
【０００７】本発明は、上記実情に鑑みてなされたもの
であり、その目的は、連結部でのシール性を好適に確保
しつつ、亀裂等の生じない安定した連結状態を確保する
ことのできる連結管を提供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to ensure a stable connection state in which cracks and the like do not occur while suitably securing the sealing property at a connection portion. It is to provide a connecting pipe.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
の手段及びその作用効果について以下に記載する。請求
項１に記載の発明は、第１及び第２の管体が連結されて
なる連結管において、前記第１の管体はその端部が全周
にわたり管体本体と所定の間隙をもって折り返された折
り返し部を有し、前記第２の管体はその端部が前記折り
返し部に外嵌されるように全周にわたって拡径された拡
径部を有し、これら嵌合された折り返し部及び拡径部が
断面略Ｕ字形状の挟持部材により全周にわたって挟持さ
れてなることを要旨とする。The means for achieving the above object and the effects thereof will be described below. According to a first aspect of the present invention, in the connecting pipe in which the first and second pipes are connected, the first pipe is folded over the entire circumference thereof with a predetermined gap from the pipe main body. The second tube body has a diameter-enlarged portion whose diameter is enlarged over the entire circumference so that an end of the second tube body is externally fitted to the folded portion. The gist is that the enlarged diameter portion is sandwiched by a clamping member having a substantially U-shaped cross section over the entire circumference.
【０００９】上記構成では、前記折り返し部及び拡径部
が挟持部材の挟持力によって当接したまま互いに摺動す
ることにより連結管の伸縮が吸収されるようになる。更
に、折り返し部及び拡径部の連結部におけるシール性を
高めるべく挟持部材の挟持力を大きくしたとしても、そ
の挟持力によって第１及び第２の管体の本体側に変形が
生じて連結管の伸縮が阻害されることはない。従って、
これら連結管におけるシール性を好適に確保しつつ、亀
裂等の発生しない安定した連結状態を確保することがで
きるようになる。In the above configuration, the folded portion and the enlarged diameter portion slide against each other while being in contact with each other by the holding force of the holding member, so that the expansion and contraction of the connecting pipe can be absorbed. Furthermore, even if the holding force of the holding member is increased in order to enhance the sealing performance at the connection portion between the folded portion and the enlarged diameter portion, the holding force causes deformation on the main body side of the first and second pipes, and the connecting tube is deformed. The expansion and contraction of is not hindered. Therefore,
It is possible to secure a stable connection state in which cracks or the like do not occur while suitably securing the sealing properties of these connection pipes.
【００１０】ここで、上記折り返し部や拡径部を別部材
とし、これらを各管体の本体に溶接によって設けるよう
にした構成では、その溶接に際して熱応力が残るように
なるため、その後に連結管が熱膨張や熱収縮した際に同
溶接部に発生する熱応力が過大になり亀裂等の損傷を招
く懸念がある。Here, in the configuration in which the folded-back portion and the enlarged-diameter portion are formed as separate members, and these are provided on the main body of each tube body by welding, thermal stress remains during the welding, so that the connecting portions are thereafter connected. When the pipe undergoes thermal expansion or contraction, the thermal stress generated in the welded portion becomes excessive, and there is a concern that damage such as cracks may occur.
【００１１】そこで、請求項２に記載の発明では、請求
項１に記載した連結管において、前記折り返し部が前記
第１の管体の端部に一体形成され、且つ、前記拡径部が
前記第２の管体の端部に一体形成されてなることを要旨
とする。Therefore, in the second aspect of the invention, in the connecting pipe according to the first aspect, the folded portion is formed integrally with an end of the first tubular body, and the enlarged diameter portion is formed in the connecting pipe. The gist is that it is formed integrally with the end of the second tube.
【００１２】上記構成によれば、こうした溶接に伴う残
留熱応力の発生を防止して亀裂等の発生しない安定した
連結状態を確保することができるようになる。請求項３
に記載の発明では、請求項１または２記載の連結管にお
いて、前記折り返し部及び前記拡径部のいずれか一方に
は全周にわたってその周方向に延びる凸部が形成され、
その凸部が前記折り返し部及び前記拡径部の他方に接触
することを要旨とする。According to the above configuration, it is possible to prevent the generation of residual thermal stress due to such welding and to secure a stable connection state in which cracks and the like do not occur. Claim 3
According to the invention described in (1), in the connecting pipe according to claim 1 or 2, a convex portion extending in the circumferential direction over the entire circumference is formed on one of the folded portion and the enlarged diameter portion,
The gist is that the convex portion contacts the other of the folded portion and the enlarged diameter portion.
【００１３】上記構成によれば、折り返し部と拡径部と
の接触面積を小さくしてそれらの接触圧を増大させるこ
とができ、連結部におけるシール性を一層高めることが
できるようになる。According to the above configuration, the contact area between the folded portion and the enlarged diameter portion can be reduced to increase the contact pressure therebetween, and the sealing performance at the connecting portion can be further improved.
【００１４】請求項４に記載の発明では、請求項３に記
載の連結管において、前記折り返し部及び前記拡径部の
いずれか一方はその一部若しくは全部が断面波状に形成
されてなることを要旨とする。According to a fourth aspect of the present invention, in the connecting pipe according to the third aspect, one of the folded portion and the enlarged diameter portion has a part or the whole formed in a wavy cross section. Make a summary.
【００１５】上記構成によれば、折り返し部及び拡径部
のいずれか一方はその一部若しくは全部が断面波状に形
成されているため、その断面波状に形成された部分は挟
持部材の挟持によって弾性変形した状態で折り返し部及
び拡径部の他方に接触するようになる。従って、折り返
し部及び拡径部の連結部が振動したような場合であって
も、これらの接触圧の変動を極力抑えることができ、そ
のシール性を一層高めることができるようになる。According to the above configuration, one or both of the folded portion and the enlarged diameter portion are formed in a wavy cross section, so that the portion formed in a wavy cross section is elastic by being held by the holding member. In the deformed state, it comes into contact with the other of the folded portion and the enlarged diameter portion. Therefore, even when the connecting portion between the folded portion and the enlarged diameter portion vibrates, the fluctuation of the contact pressure can be suppressed as much as possible, and the sealing property can be further improved.
【００１６】請求項５に記載の発明は、請求項１〜４の
いずれかに記載の連結管において、前記折り返し部及び
拡径部のいずれか一方と前記挟持部材との間には前記折
り返し部の折り返し方向における挟持部材の移動を規制
する規制手段が設けられてなることを要旨とする。According to a fifth aspect of the present invention, in the connecting pipe according to any one of the first to fourth aspects, the folded portion is provided between one of the folded portion and the enlarged diameter portion and the holding member. The gist is that a regulating means for regulating the movement of the holding member in the folding direction is provided.
【００１７】上記構成によれば、挟持部材が折り返し部
及び拡径部の連結部から抜け落ちるのを抑制することが
でき、同挟持部材によって折り返し部及び拡径部を確実
に挟持してそれら連結部のシール性を維持することがで
きるようになる。According to the above configuration, the holding member can be prevented from falling off from the connecting portion between the folded portion and the enlarged diameter portion. Can be maintained.
【００１８】請求項６に記載の発明は、請求項５記載の
連結管において、前記規制手段が前記折り返し部及び拡
径部のいずれか一方に設けられた凸部と前記挟持部材に
設けられてこれに係止される被係止部とからなることを
要旨とする。According to a sixth aspect of the present invention, in the connecting pipe according to the fifth aspect, the restricting means is provided on a convex portion provided on one of the folded portion and the enlarged diameter portion and on the holding member. The gist of the present invention consists of a locked portion to be locked to this.
【００１９】上記構成によれば、容易な構成で挟持部材
の移動を規制することができる。請求項７に記載の発明
は、請求項１〜６のいずれかに記載の連結管において、
前記第１及び第２の管体が内燃機関の排気マニホールド
の一部を構成する管体であることを要旨とする。According to the above configuration, the movement of the holding member can be restricted with a simple configuration. The invention according to claim 7 is the connection pipe according to any one of claims 1 to 6,
The gist is that the first and second pipes are pipes that constitute a part of an exhaust manifold of an internal combustion engine.
【００２０】排気マニホールド内には、燃焼直後の高温
となっている排気ガスが流通するため、このマニホール
ドを構成する管体も機関停止時と比較して極めて高温と
なり、管体自身の熱膨張・熱収縮に伴う変形量が大きく
なる。Since high-temperature exhaust gas immediately after combustion flows through the exhaust manifold, the temperature of the pipe constituting the manifold also becomes extremely high as compared with when the engine is stopped, and the thermal expansion of the pipe itself is reduced. The amount of deformation due to heat shrinkage increases.
【００２１】この点、上記構成によれば、このように熱
膨張・熱収縮に伴う変形量が大きくなる排気マニホール
ドであっても、これら連結管におけるシール性を好適に
確保しつつ、亀裂等の発生しない安定した連結状態を確
保することができるようになる。In this regard, according to the above-described structure, even in the exhaust manifold in which the amount of deformation due to thermal expansion and thermal contraction is large, cracks and the like can be obtained while ensuring the sealing properties of these connecting pipes. A stable connection state that does not occur can be secured.
【００２２】[0022]
【発明の実施の形態】以下、本発明の連結管を内燃機関
の排気マニホールドに適用するようにした一実施の形態
について、図１〜図３を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the connecting pipe of the present invention is applied to an exhaust manifold of an internal combustion engine will be described below with reference to FIGS.
【００２３】図１は、本実施の形態にかかる排気マニホ
ールドを示す概略図である。この排気マニホールド１１
は、集合管１２と、この集合管１２から内燃機関３０の
気筒数分だけ分岐した分岐管１５とを備えている。各分
岐管１５は、それらの一端が内燃機関３０のシリンダヘ
ッドに接続されており、これら各分岐管１５を介して内
燃機関３０の燃焼室（図示略）と集合管１２とが連通さ
れている。FIG. 1 is a schematic diagram showing an exhaust manifold according to the present embodiment. This exhaust manifold 11
Is provided with a collecting pipe 12 and a branch pipe 15 branched from the collecting pipe 12 by the number of cylinders of the internal combustion engine 30. One end of each of the branch pipes 15 is connected to a cylinder head of the internal combustion engine 30, and a combustion chamber (not shown) of the internal combustion engine 30 and the collecting pipe 12 are communicated via the branch pipes 15. .
【００２４】集合管１２は、上流管１３と下流管１４と
を備え、これらが連結部１６において連結されることで
構成されている。連結部１６は、集合管１２において上
流管１３及び下流管１４が接続される部分の間に設けら
れている。The collecting pipe 12 includes an upstream pipe 13 and a downstream pipe 14, which are connected at a connecting portion 16. The connecting portion 16 is provided between a portion of the collecting pipe 12 where the upstream pipe 13 and the downstream pipe 14 are connected.
【００２５】図２は、この連結部１６の断面構造を示し
ている。同図に示されるように、上流管１３の下流側部
分には、その端部が全周にわたり管本体と所定の隙間を
もってその軸方向に折り返された折り返し部１３ａが一
体形成されている。一方、下流管１４の上流側端部に
は、上記折り返し部１３ａに外嵌されるように全周にわ
たって拡径された拡径部１４ａが一体形成されている。FIG. 2 shows a sectional structure of the connecting portion 16. As shown in the figure, the downstream portion of the upstream pipe 13 is integrally formed with a folded portion 13a whose end is folded in the axial direction with a predetermined gap with the pipe body over the entire circumference. On the other hand, the downstream end of the downstream pipe 14 is integrally formed with an enlarged diameter portion 14a whose diameter is increased over the entire circumference so as to be fitted to the folded portion 13a.
【００２６】そして、折り返し部１３ａに拡径部１４ａ
が嵌合された状態で、これら折り返し部１３ａ及び拡径
部１４ａを環状の挟持部材１７により全周にわたって弾
性的に挟持されている。Then, the enlarged diameter portion 14a is added to the folded portion 13a.
Are fitted, the folded portion 13a and the enlarged diameter portion 14a are elastically held by the annular holding member 17 over the entire circumference.
【００２７】図２及び図３に示されるように、この挟持
部材１７は断面が略Ｕ字形状をなし、折り返し部１３ａ
及び拡径部１４ａを挟む内壁部１７ａ及び外壁部１７ｂ
と、これら各壁部１７ａ、１７ｂの一端をつなぐ底部１
７ｃとを備えている。また、上記両壁部１７ａ、１７ｂ
において開側（図２における左側）の端部近傍には、そ
れらの対向面間の幅が底部１７ｃ側の部分よりも狭くな
った幅狭部１７ｄが形成されており、この幅狭部１７ｄ
が折り返し部１３ａ及び拡径部１４ａに当接されてい
る。更に両壁部１７ａ、１７ｂのほぼ中央部には、幅狭
部１７ｄから底部１７ｃ側にかけてそれらの対向面間の
幅が徐々に拡がる段部１７ｅが形成されている。As shown in FIGS. 2 and 3, the holding member 17 has a substantially U-shaped cross section, and has a folded portion 13a.
And an inner wall portion 17a and an outer wall portion 17b sandwiching the enlarged diameter portion 14a
And a bottom 1 connecting one end of each of the walls 17a and 17b.
7c. Further, the both wall portions 17a, 17b
In the vicinity of the end on the open side (left side in FIG. 2), a narrow portion 17d in which the width between the opposing surfaces is smaller than the portion on the side of the bottom portion 17c is formed, and the narrow portion 17d is formed.
Are in contact with the folded portion 13a and the enlarged diameter portion 14a. Further, a step portion 17e is formed at a substantially central portion between the two wall portions 17a and 17b, and the width between the opposing surfaces gradually increases from the narrow portion 17d to the bottom portion 17c.
【００２８】また、折り返し部１３ａの内周面には周方
向に延びる一対の環状をなす凸部１８ａ、１８ｂが幅狭
部１７ｄを挟むように所定間隔を隔てて形成されてい
る。そして、これらのうち一方の凸部１８ａにより、挟
持部材１７の内壁部１７ａの段部１７ｅが係止されて、
折り返し部１３ａの折り返し方向（図２における右方
向）における挟持部材１７の移動が規制される。また、
他方の凸部１８ｂにより内壁部１７ａの端部が係止され
て上記折り返し方向と逆方向における挟持部材１７の移
動が規制される。A pair of annular convex portions 18a and 18b extending in the circumferential direction are formed on the inner peripheral surface of the folded portion 13a at predetermined intervals so as to sandwich the narrow portion 17d. Then, the step portion 17e of the inner wall portion 17a of the holding member 17 is locked by one of the convex portions 18a,
The movement of the holding member 17 in the folding direction of the folded portion 13a (right direction in FIG. 2) is restricted. Also,
The end of the inner wall portion 17a is locked by the other convex portion 18b, and the movement of the holding member 17 in the direction opposite to the folding direction is restricted.
【００２９】また、上記上流管１３、下流管１４、及び
挟持部材１７は、例えば次のように組み付けられる。ま
ず、挟持部材１７に分岐管１５が接合されていない上流
管１３の上流側端部を挿入させる。次いで、上流管１３
の折り返し部１３ａに下流管１４の拡径部１４ａを外嵌
させた後、挟持部材１７をこれら折り返し部１３ａ及び
拡径部１４ａに嵌め込む。この際、挟持部材１７を弾性
変形させて両壁部１７ａ、１７ｂの間を拡げながら嵌め
込んで幅狭部１７ｄを折り返し部１３ａの両凸部１８
ａ、１８ｂの間に位置させる。その後、集合管１２の上
流管１３に分岐管１５を接合する。The upstream pipe 13, the downstream pipe 14, and the holding member 17 are assembled as follows, for example. First, the upstream end of the upstream pipe 13 to which the branch pipe 15 is not joined is inserted into the holding member 17. Next, the upstream pipe 13
After the enlarged diameter portion 14a of the downstream pipe 14 is externally fitted to the folded portion 13a, the holding member 17 is fitted to the folded portion 13a and the enlarged diameter portion 14a. At this time, the holding member 17 is elastically deformed and fitted while expanding between the two wall portions 17a and 17b, and the narrow portion 17d is formed into the two convex portions 18 of the folded portion 13a.
a, 18b. Thereafter, the branch pipe 15 is joined to the upstream pipe 13 of the collecting pipe 12.
【００３０】以上詳述した本実施の形態にかかる連結管
によれば、以下に示すような優れた効果が得られるよう
になる。 （１）上流管１３の下流側端部に形成された折り返し部
１３ａに下流管１４の上流側端部に形成された拡径部１
４ａを外嵌させ、更にこの嵌合された折り返し部１３ａ
及び拡径部１４ａを挟持部材１７により全周にわたって
挟持する構成としたため、折り返し部１３ａ及び拡径部
１４ａが挟持部材１７の挟持力によって当接したまま互
いに摺動することにより集合管１２の伸縮が吸収される
ようになる。更に、集合管１２の連結部１６におけるシ
ール性を高めるべく挟持部材１７の挟持力を大きくした
としても、その挟持力によって上流管１３及び下流管１
４の管本体に変形が生じて集合管１２の伸縮が阻害され
ることはない。従って、これら集合管１２におけるシー
ル性を好適に確保しつつ、亀裂等の発生しない安定した
連結状態を確保することができるようになる。According to the connecting pipe according to the present embodiment described in detail above, the following excellent effects can be obtained. (1) The enlarged diameter portion 1 formed at the upstream end of the downstream pipe 14 at the folded portion 13 a formed at the downstream end of the upstream pipe 13.
4a, and the fitted folded portion 13a
Since the enlarged diameter portion 14a is sandwiched by the clamping member 17 over the entire circumference, the folded portion 13a and the enlarged diameter portion 14a slide with each other while being in contact with the clamping force of the clamping member 17, thereby expanding and contracting the collecting pipe 12. Will be absorbed. Furthermore, even if the holding force of the holding member 17 is increased in order to enhance the sealing performance at the connecting portion 16 of the collecting pipe 12, the holding force is increased by the holding force.
The deformation of the collecting pipe 12 due to the deformation of the pipe body 4 is not hindered. Therefore, it is possible to secure a stable connection state in which cracks and the like do not occur, while suitably securing the sealing properties of these collecting pipes 12.
【００３１】（２）折り返し部１３ａを上流管１３の端
部に一体形成し、また、拡径部１４ａも下流管１４の端
部に一体形成するようにしたため、これら折り返し部１
３ａ及び拡径部１４ａを各管１３、１４にそれぞれ溶接
するようにした構成とは異なり、その溶接に伴う残留熱
応力の発生を防止して亀裂等の発生しない安定した連結
状態を確保することができるようになる。(2) The folded portion 13a is formed integrally with the end of the upstream pipe 13, and the enlarged diameter portion 14a is formed integrally with the end of the downstream pipe 14.
Unlike the configuration in which the 3a and the enlarged diameter portion 14a are welded to the pipes 13 and 14, respectively, the generation of residual thermal stress due to the welding is prevented, and a stable connection state free from cracks and the like is secured. Will be able to
【００３２】（３）上流管１３の折り返し部１３ａには
凸部１８ａ、１８ｂを設け、これらにより挟持部材１７
の端部及び段部１７ｅを係止するようにしたため、簡単
な構成で挟持部材１７が折り返し部１３ａ及び拡径部１
４ａから抜け落ちるのを抑制でき、挟持部材１７によっ
て折り返し部１３ａ及び拡径部１４ａを確実に挟持して
連結部１６のシール性を維持することができるようにな
る。(3) Protrusions 18a and 18b are provided at the folded portion 13a of the upstream pipe 13, and the holding members 17
And the stepped portion 17e are locked, so that the holding member 17 has a simple structure so that the folded portion 13a and the enlarged diameter portion 1
4A can be suppressed, and the folded-back portion 13a and the enlarged-diameter portion 14a can be reliably held by the holding member 17, and the sealing property of the connecting portion 16 can be maintained.
【００３３】（４）熱膨張・熱収縮に伴う変形量が大き
くなる排気マニホールドであっても、集合管１２におけ
る排気ガスのシール性を好適に確保しつつ、亀裂等の発
生しない安定した連結状態を確保することができるよう
になる。(4) Even in the case of an exhaust manifold in which the amount of deformation due to thermal expansion and contraction is large, a stable connection state in which cracks and the like do not occur while suitably securing the exhaust gas sealing property in the collecting pipe 12. Can be secured.
【００３４】なお、上記実施の形態は例えば、以下のよ
うにその構成を適宜変更することもできる。 ・上記実施の形態では、一対の凸部１８ａ、１８ｂを折
り返し部１３ａに形成しこれらにより挟持部材１７の端
部及び段部１７ｅを係止してその移動を規制するように
したが、同挟持部材１７の端部を係止する一方の凸部１
８ｂについてはこれを省略するようにしてもよい。この
ようにしても、挟持部材１７が嵌合された折り返し部１
３ａ及び拡径部１４ａから抜け落ちることを抑制するこ
とはできる。In the above embodiment, for example, the configuration can be appropriately changed as follows. In the above-described embodiment, the pair of convex portions 18a and 18b are formed in the folded portion 13a, and the end portions and the step portion 17e of the holding member 17 are locked by these to restrict the movement. One convex portion 1 for locking the end of the member 17
This may be omitted for 8b. Even in this case, the folded portion 1 in which the holding member 17 is fitted is provided.
It is possible to suppress falling off from the 3a and the enlarged diameter portion 14a.
【００３５】・図４に示すように、挟持部材１７の両端
部あるいは一方の端部のみを外方に折り曲げて幅狭部１
７ｄにおける両壁部１７ａ、１７ｂ間の幅を部分的に拡
げるようにしてもよい。このようにすれば、挟持部材１
７を嵌合された折り返し部１３ａ及び拡径部１４ａには
め込む作業が容易になる。As shown in FIG. 4, both ends or only one end of the sandwiching member 17 is bent outward to form the narrow portion 1.
The width between the two wall portions 17a and 17b in 7d may be partially enlarged. By doing so, the holding member 1
The work of fitting the 7 into the folded-back portion 13a and the enlarged-diameter portion 14a fitted therein becomes easy.
【００３６】・図５に示すように、拡径部１４ａの先端
部の全部または一部を更に外方に拡げて第２の拡径部１
４ｂを形成してもよい。このようにすれば、第２の拡径
部１４ｂが挟持部材１７の段部１７ｅに係止されること
で上流管１３から離間する方向（同図５中において左方
向）における下流管１４の移動が規制され、拡径部１４
ａが段部１７ｅの間から抜けることを抑制することがで
きる。As shown in FIG. 5, the whole or a part of the distal end of the enlarged diameter portion 14a is further expanded outward to form the second enlarged diameter portion 1a.
4b may be formed. With this configuration, the second enlarged diameter portion 14b is locked to the step portion 17e of the holding member 17, so that the downstream tube 14 moves in the direction away from the upstream tube 13 (to the left in FIG. 5). Is regulated and the enlarged diameter portion 14
a can be suppressed from falling out from between the steps 17e.
【００３７】・上記実施の形態では、内燃機関の排気マ
ニホールドの一部を構成する連結管の例を示したが、本
発明は、排気管を構成するその他の部分にも同様に適用
することができる。要は、冷熱サイクルの繰り返し等に
起因する管体自身の伸縮が無視できない環境に用いられ
る連結管に適用することができる。In the above embodiment, the example of the connecting pipe constituting a part of the exhaust manifold of the internal combustion engine has been described. However, the present invention can be similarly applied to other parts constituting the exhaust pipe. it can. In short, the present invention can be applied to a connecting pipe used in an environment where expansion and contraction of the pipe itself due to repetition of a cooling / heating cycle cannot be ignored.
【００３８】・上記実施の形態では、凸部１８ａ及び１
８ｂを折り返し部１３ａの内周面に形成するようにした
が、図６に示すように、これら各凸部１８ａ、１８ｂを
拡径部１４ａの外周面に形成するようにしてもよい。In the above embodiment, the convex portions 18a and 1
Although 8b is formed on the inner peripheral surface of the folded portion 13a, as shown in FIG. 6, these convex portions 18a and 18b may be formed on the outer peripheral surface of the enlarged diameter portion 14a.
【００３９】・上記実施の形態では、折り返し部１３ａ
の凸部１８ａ、１８ｂにより挟持部材１７の端部及び段
部１７ｅを係止して挟持部材１７の移動を規制すること
とした。しかし、この挟持部材１７の移動を規制する構
成はこうしたものには限られない。例えば、折り返し部
１３ａに凹部を、一方、挟持部材１７に凸部をそれぞれ
設けたり、折り返し部１３ａに貫通孔を設けるととも
に、挟持部材１７の幅狭部１７ｄにこの貫通孔に係止さ
れる凸部を形成した構成を採用するようにしてもよい。In the above embodiment, the folded portion 13a
The protrusions 18a and 18b lock the end of the holding member 17 and the step 17e to restrict the movement of the holding member 17. However, the configuration for restricting the movement of the holding member 17 is not limited to this. For example, a concave portion is provided in the folded portion 13a, a convex portion is provided in the holding member 17, a through hole is provided in the folded portion 13a, and a convex portion locked in the through hole is provided in the narrow portion 17d of the holding member 17. A configuration in which a portion is formed may be adopted.
【００４０】・拡径部１４ａを例えば、図７に示される
ように、その一部を断面波状に形成したり、図８に示さ
れるように、その全部を断面波状に形成したりしてもよ
い。また、図９に示されるように、折り返し部１３ａの
一部を断面波状に形成したり、図１０に示されるよう
に、その全部を断面波状に形成したりしてもよい。For example, as shown in FIG. 7, a part of the enlarged diameter portion 14a may be formed in a wavy cross section, or the entire enlarged portion 14a may be formed in a wavy cross section as shown in FIG. Good. Further, as shown in FIG. 9, a part of the folded portion 13a may be formed in a wavy cross section, or as shown in FIG. 10, the whole may be formed in a wavy cross section.
【００４１】これらのようにすれば、折り返し部１３ａ
及び拡径部１４ａの面精度が高くない場合であっても、
排気マニホールド１１の使用時、上流管１３及び下流管
１４が周方向に熱膨張することにより、折り返し部１３
ａと拡径部１４ａとが一様に接触し易くなる。また、折
り返し部１３ａと拡径部１４ａとの接触圧を増大させる
ことができ、シール性を一層高めることができるように
なる。By doing so, the folded portion 13a
Even when the surface accuracy of the enlarged diameter portion 14a is not high,
When the exhaust manifold 11 is used, the upstream pipe 13 and the downstream pipe 14 thermally expand in the circumferential direction, so that the folded portion 13
a and the large-diameter portion 14a are easily and uniformly contacted. Further, the contact pressure between the folded portion 13a and the enlarged diameter portion 14a can be increased, and the sealing performance can be further improved.
【００４２】更に、折り返し部１３ａや拡径部１４ａの
一部若しくは全部を断面波状に形成する場合には、その
断面波状に形成された部分が挟持部材１７の挟持力によ
って弾性変形した状態で折り返し部１３ａ及び拡径部１
４ａの他方に接触するようになる。従って、連結部１６
が振動したりするような場合であっても、これらの接触
圧の変動を抑えることができ、そのシール性を一層高め
ることができるようになる。Further, when a part or the whole of the folded portion 13a or the enlarged diameter portion 14a is formed in a wavy section, the folded portion is elastically deformed by the holding force of the holding member 17 in a state of being turned back. Part 13a and enlarged diameter part 1
4a comes into contact with the other side. Therefore, the connecting portion 16
Even when the vibration occurs, the fluctuation of the contact pressure can be suppressed, and the sealing performance can be further improved.
【図１】本発明にかかる連結管の一実施の形態について
その構成を示す側面図。FIG. 1 is a side view showing a configuration of an embodiment of a connecting pipe according to the present invention.
【図２】上記実施の形態に採用される連結管の連結部の
断面構造を示す断面図。FIG. 2 is a cross-sectional view showing a cross-sectional structure of a connecting portion of a connecting pipe employed in the embodiment.
【図３】同実施の形態に用いられる挟持部材の斜視図。FIG. 3 is a perspective view of a holding member used in the embodiment.
【図４】挟持部材の他の例を示す断面図。FIG. 4 is a cross-sectional view showing another example of a holding member.
【図５】他の例の連結部の断面構造を示す拡大断面図。FIG. 5 is an enlarged cross-sectional view showing a cross-sectional structure of a connecting portion of another example.
【図６】他の例の連結部の断面構造を示す拡大断面図。FIG. 6 is an enlarged cross-sectional view illustrating a cross-sectional structure of a connecting portion according to another example.
【図７】他の例の連結部の断面構造を示す拡大断面図。FIG. 7 is an enlarged cross-sectional view illustrating a cross-sectional structure of a connecting portion according to another example.
【図８】他の例の連結部の断面構造を示す拡大断面図。FIG. 8 is an enlarged cross-sectional view illustrating a cross-sectional structure of a connecting portion according to another example.
【図９】他の例の連結部の断面構造を示す拡大断面図。FIG. 9 is an enlarged cross-sectional view illustrating a cross-sectional structure of a connecting portion according to another example.
【図１０】他の例の連結部の断面構造を示す拡大断面
図。FIG. 10 is an enlarged cross-sectional view showing a cross-sectional structure of a connection portion of another example.
【図１１】従来構成にかかる連結管の連結部の断面図。FIG. 11 is a sectional view of a connecting portion of a connecting pipe according to a conventional configuration.
１１…排気マニホールド、１３…上流管、１３ａ…折り
返し部、１４…下流管、１４ａ…拡径部、１６…連結
部、１７…挟持部材、１７ａ…内壁部、１７ｂ…外壁
部、１７ｃ…底部、１７ｄ…幅狭部、１７ｅ…段部、１
８ａ、１８ｂ…凸部。Reference numeral 11: exhaust manifold, 13: upstream pipe, 13a: folded portion, 14: downstream pipe, 14a: enlarged diameter section, 16: connecting section, 17: holding member, 17a: inner wall section, 17b: outer wall section, 17c: bottom section, 17d: narrow portion, 17e: step portion, 1
8a, 18b ... convex parts.
Claims (7)
管において、 前記第１の管体はその端部が全周にわたり管体本体と所
定の間隙をもって折り返された折り返し部を有し、前記
第２の管体はその端部が前記折り返し部に外嵌されるよ
うに全周にわたって拡径された拡径部を有し、これら嵌
合された折り返し部及び拡径部が断面略Ｕ字形状の挟持
部材により全周にわたって挟持されてなることを特徴と
する連結管。1. A connecting pipe comprising a first pipe and a second pipe connected to each other, wherein the first pipe has a folded portion whose entire end is folded with a predetermined gap from the pipe body. The second tubular body has a diameter-enlarging portion whose diameter is enlarged over the entire circumference so that an end thereof is fitted to the folding-back portion. A connecting pipe characterized in that it is held by a holding member having a substantially U-shaped cross section over its entire circumference.
一体形成され、且つ、前記拡径部が前記第２の管体の端
部に一体形成されてなる請求項１の連結管。2. The connection according to claim 1, wherein said folded portion is formed integrally with an end of said first tube, and said enlarged diameter portion is formed integrally with an end of said second tube. tube.
一方には全周にわたってその周方向に延びる凸部が形成
され、その凸部が前記折り返し部及び前記拡径部の他方
に接触する請求項１又は２記載の連結管。3. One of the folded portion and the enlarged diameter portion is formed with a convex portion extending in the circumferential direction over the entire circumference, and the convex portion contacts the other of the folded portion and the enlarged diameter portion. The connecting pipe according to claim 1.
一方はその一部若しくは全部が断面波状に形成されてな
る請求項３に記載の連結管。4. The connecting pipe according to claim 3, wherein one of the folded portion and the enlarged diameter portion is partially or entirely formed in a wavy cross section.
おいて、 前記折り返し部及び拡径部のいずれか一方と前記挟持部
材との間には前記折り返し部の折り返し方向における挟
持部材の移動を規制する規制手段が設けられてなること
を特徴とする連結管。5. The connecting pipe according to claim 1, wherein one of the folded portion and the enlarged diameter portion is provided between the holding member and the holding member in a folding direction of the folded portion. A connecting pipe provided with a restricting means for restricting movement.
のいずれか一方に設けられた凸部と前記挟持部材に設け
られてこれに係止される被係止部とからなる請求項５記
載の連結管。6. The control means according to claim 5, wherein said restricting means comprises a convex portion provided on one of said folded portion and said enlarged diameter portion, and a locked portion provided on said holding member and locked thereto. The connecting pipe as described.
マニホールドの一部を構成する管体である請求項１〜６
のいずれかに記載の連結管。7. The pipe according to claim 1, wherein said first and second pipes form a part of an exhaust manifold of an internal combustion engine.
The connecting pipe according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000124334A JP2001304466A (en) | 2000-04-25 | 2000-04-25 | Coupling pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000124334A JP2001304466A (en) | 2000-04-25 | 2000-04-25 | Coupling pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001304466A true JP2001304466A (en) | 2001-10-31 |
Family
ID=18634478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000124334A Withdrawn JP2001304466A (en) | 2000-04-25 | 2000-04-25 | Coupling pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001304466A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013526674A (en) * | 2010-05-21 | 2013-06-24 | ベンテラー アウトモビールテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Turbine housing of exhaust gas turbocharger |
-
2000
- 2000-04-25 JP JP2000124334A patent/JP2001304466A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013526674A (en) * | 2010-05-21 | 2013-06-24 | ベンテラー アウトモビールテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Turbine housing of exhaust gas turbocharger |
| US9341081B2 (en) | 2010-05-21 | 2016-05-17 | Benteler Automobiltechnik Gmbh | Turbine housing of an exhaust gas turbocharger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7328685B2 (en) | Slip joint exhaust manifolds | |
| JP3840556B2 (en) | Combustor liner seal structure | |
| US5761905A (en) | Exhaust manifold | |
| US4142366A (en) | Exhaust double pipe of an internal combustion engine | |
| US4185463A (en) | Exhaust double pipe of an internal combustion engine | |
| JPH07139425A (en) | Stirling engine | |
| JP2001304466A (en) | Coupling pipe | |
| JP2007023849A (en) | Fastening structure of exhaust manifold | |
| JP2001263054A (en) | Exhaust pipe | |
| KR101807025B1 (en) | Sealing device for exhaust manifold | |
| JP4224179B2 (en) | Pipe joint structure | |
| JP2003220465A (en) | Piping joint structure for flange | |
| JP2004190610A (en) | Joint structure of double piping | |
| JPH07293276A (en) | Spring clip structure of supercharger | |
| US6687996B2 (en) | Method of making an exhaust gas collector | |
| JP3417120B2 (en) | Flexible joint for automobile exhaust pipe | |
| JP3382760B2 (en) | Exhaust pipe connection structure | |
| JP2536135Y2 (en) | Exhaust silencer | |
| JP2000282858A (en) | Exhaust pipe for engine | |
| JP2562096Y2 (en) | Exhaust pipe fitting | |
| JP3600607B2 (en) | Channel cutoff device | |
| JP2009228474A (en) | Double pipe structure and exhaust pipe structure of internal combustion engine | |
| JPH1136856A (en) | Double exhaust pipe | |
| JPH09257164A (en) | Pipe connecting structure | |
| JPH1193657A (en) | Pipe coupling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050926 |
|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20061213 |