JPH09151730A - Exhaust double pipe - Google Patents
Exhaust double pipeInfo
- Publication number
- JPH09151730A JPH09151730A JP31340495A JP31340495A JPH09151730A JP H09151730 A JPH09151730 A JP H09151730A JP 31340495 A JP31340495 A JP 31340495A JP 31340495 A JP31340495 A JP 31340495A JP H09151730 A JPH09151730 A JP H09151730A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- flange
- exhaust
- connecting short
- fixed
- 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
- 238000003466 welding Methods 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 9
- 230000002093 peripheral effect Effects 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000011491 glass wool Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は排気二重管に関する
もので、より詳しくは、内燃機関の排気管において、内
外二重管に具備されるフランジ部の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust double pipe, and more particularly, to an improvement of a flange portion provided in an inner and outer double pipe in an exhaust pipe of an internal combustion engine.
【０００２】[0002]
【従来の技術】自動車においては、排気管の下流部に触
媒コンバータを配置して排気ガスの浄化を図る排気対策
が行われている。この場合、浄化効果の面ではエンジン
始動時が問題となる。すなわち、エンジン始動時は、触
媒及び排気ガスが共に低温であるため、触媒温度が活性
温度に至らず、化学変化が起こりにくく排気ガス内の未
燃成分が十分に反応しきれない状況が発生する。2. Description of the Related Art In automobiles, a catalytic converter is arranged downstream of an exhaust pipe to take measures for exhaust gas to purify exhaust gas. In this case, when starting the engine, there is a problem in terms of purification effect. That is, when the engine is started, both the catalyst and the exhaust gas are at a low temperature, so the catalyst temperature does not reach the activation temperature, chemical changes hardly occur, and unburned components in the exhaust gas may not fully react. .
【０００３】そこで、従来、図６及び図７に示すよう
に、排気管を二重構造にして、その内外管１，２の中間
部に断熱層３を設け、かつ、その内外管１を薄肉に形成
して排気管の熱容量を小さくして、エンジン始動時にお
ける排気ガスの温度低下を防いで、触媒を早期に活性化
させるようにしたものが特開平７−６３０５１号公報や
特開平７−１５８４３５号公報に開示されている。Therefore, conventionally, as shown in FIGS. 6 and 7, the exhaust pipe has a double structure, a heat insulating layer 3 is provided in an intermediate portion between the inner and outer pipes 1 and 2, and the inner and outer pipes 1 are thin-walled. In order to reduce the heat capacity of the exhaust pipe to prevent the temperature of the exhaust gas from lowering when the engine is started and activate the catalyst early, there is disclosed in Japanese Unexamined Patent Publication No. 7-63051 or No. 7-63051. It is disclosed in Japanese Patent No. 158435.
【０００４】そして、その内外管１，２の端部にフラン
ジ４を固着する方法として、図６に示すように、薄肉の
内外管１，２を相互にスポット溶接５ａにより固着し、
この内外管を厚みＤ1 が１０ｍｍ程の厚肉のフランジ４
の嵌合内面に嵌合してその外管２をフランジ４に溶接５
にて固着するものや図７に示すように、薄肉の内管１を
厚みＤ1 が１０ｍｍ程の厚肉のフランジ４の嵌合内面に
嵌合し、外管２を、フランジ４に形成した突部４ａの外
面に嵌合してその外管２をフランジ４に溶接５にて固着
するものがある。As a method of fixing the flange 4 to the ends of the inner and outer tubes 1 and 2, as shown in FIG. 6, the thin inner and outer tubes 1 and 2 are fixed to each other by spot welding 5a,
This inner and outer pipe is provided with a thick flange 4 having a thickness D 1 of about 10 mm.
And the outer tube 2 is welded to the flange 4 by fitting the inner surface of the
7, the thin inner tube 1 is fitted to the fitting inner surface of the thick flange 4 having a thickness D 1 of about 10 mm, and the outer tube 2 is formed on the flange 4. There is one in which the outer tube 2 is fitted to the outer surface of the projection 4a and the outer tube 2 is fixed to the flange 4 by welding 5.
【０００５】[0005]
【発明が解決しようとする課題】上記従来のように、薄
肉の内管１又は外管２を厚肉のフランジ４に溶接固着し
たものにおいては、触媒を早期に昇温させるために内外
管を薄肉に形成し、かつ断熱したにもかかわらず熱容量
の大きい厚肉のフランジ４を使用しているため、排気熱
がフランジ４を昇温するために多量に費やされてしま
い、このフランジ４も触媒の早期昇温に影響を及ぼして
いた。As described above, in the case where the thin inner tube 1 or the outer tube 2 is welded and fixed to the thick flange 4 as in the above-mentioned conventional method, the inner and outer tubes are provided in order to quickly raise the temperature of the catalyst. Since the thick flange 4 which has a large heat capacity despite being thinly formed and insulated is used, a large amount of exhaust heat is consumed to raise the temperature of the flange 4, and this flange 4 also This affected the early temperature rise of the catalyst.
【０００６】更に、フランジ４に内外管１，２を溶接固
定する際に、薄肉の内外管１，２と厚肉のフランジ４と
ではその熱容量差が大きいため、熱容量の小さい薄肉の
内外管１，２が溶け落ち易くて溶接が困難になる問題も
あった。Further, when the inner and outer pipes 1 and 2 are fixed to the flange 4 by welding, there is a large difference in heat capacity between the thin inner and outer pipes 1 and the thick flange 4, and thus the thin inner and outer pipes 1 having a small heat capacity. , 2 easily melted down, and there was a problem that welding became difficult.
【０００７】そこで本発明は、上記の課題を解決する排
気二重管を提供することを目的とするものである。[0007] Therefore, the present invention has an object to provide an exhaust double pipe for solving the above problems.
【０００８】[0008]
【課題を解決するための手段及びその作用】上記の課題
を解決するために、請求項１記載の第１の発明は、排気
管を内外管により構成し、該排気管の端部にフランジを
溶接固定するものにおいて、上記フランジ（１０）を、
金属の薄板（なお、通常、鋼板において薄板という場合
は、数ミリ程度の肉厚のものを指し、本発明においても
同様である。）で形成したことを特徴とするものであ
る。In order to solve the above-mentioned problems, the first aspect of the present invention is to provide an exhaust pipe with inner and outer pipes, and a flange at the end of the exhaust pipe. In the case of welding and fixing, the flange (10) is
It is characterized in that it is formed of a metal thin plate (usually, a thin plate in a steel plate refers to a thin plate having a thickness of about several millimeters and the same in the present invention).
【０００９】請求項２記載の第２の発明は、排気管を内
外管により構成し、該排気管の端部にフランジを溶接固
定するものにおいて、上記フランジを、プレス加工によ
る金属の薄板の折り曲げにより、一般平面部（１０ａ）
と一般平面部（１０ａ）から一体的に突設した接続短管
（１０ｂ）とで形成するとともに、内管（７）か外管
（８）の少なくとも一方を接続短管（１０ｂ）に溶接固
定したことを特徴とするものである。According to a second aspect of the present invention, in which the exhaust pipe is constituted by an inner pipe and an outer pipe, and a flange is welded and fixed to an end portion of the exhaust pipe, the flange is bent by bending a thin metal plate. Due to the general plane part (10a)
And a connecting short pipe (10b) integrally protruding from the general plane portion (10a), and at least one of the inner pipe (7) and the outer pipe (8) is welded and fixed to the connecting short pipe (10b). It is characterized by having done.
【００１０】請求項３記載の第３の発明は、請求項２記
載の排気管（６）を構成する内管（７）と外管（８）の
両端部（７ａ）（８ａ）を重合し、その外管（８）の端
部（８ａ）をフランジ（１０）の接続短管（１０ｂ）の
内面に嵌合したことを特徴とするものである。In a third aspect of the present invention, the inner pipe (7) and the outer pipe (8) constituting the exhaust pipe (6) of the second aspect are polymerized at both ends (7a) (8a). The end portion (8a) of the outer pipe (8) is fitted to the inner surface of the connecting short pipe (10b) of the flange (10).
【００１１】請求項４記載の第４の発明は、請求項２記
載の排気管（６）を構成する内管（７）の端部（７ａ）
がフランジ（１０）における接続短管（１０ｂ）の内面
に嵌合され、外管（８）の端面が接続短管（１０ｂ）の
端面に当接していることを特徴とするものである。According to a fourth aspect of the present invention, the end portion (7a) of the inner pipe (7) which constitutes the exhaust pipe (6) according to the second aspect.
Is fitted to the inner surface of the connecting short pipe (10b) in the flange (10), and the end surface of the outer pipe (8) is in contact with the end surface of the connecting short pipe (10b).
【００１２】請求項５記載の第５の発明は、請求項２記
載の排気管（６）を構成する内管（７）の端部（７ａ）
がフランジ（１０）における接続短管（１０ｂ）の内面
に嵌合され、外管（８）の端部（８ａ）が接続短管（１
０ｂ）の外面に嵌合されていることを特徴とするもので
ある。According to a fifth aspect of the present invention, the end portion (7a) of the inner pipe (7) constituting the exhaust pipe (6) according to the second aspect.
Is fitted to the inner surface of the connecting short pipe (10b) in the flange (10), and the end portion (8a) of the outer pipe (8) is connected to the short connecting pipe (1).
0b) is fitted on the outer surface.
【００１３】請求項６記載の第６の発明は、請求項２記
載の排気管（６）における内管（７）の端部（７ａ）と
外管（８）の端部（８ａ）を重合し、その内管（７）の
端部（７ａ）をフランジ（１０）における接続短管（１
０ｂ）の外面に嵌合したことを特徴とするものである。In a sixth aspect of the present invention, the end portion (7a) of the inner pipe (7) and the end portion (8a) of the outer pipe (8) in the exhaust pipe (6) according to the second aspect are polymerized. Then, connect the end portion (7a) of the inner pipe (7) to the connecting short pipe (1) at the flange (10).
It is characterized in that it is fitted to the outer surface of 0b).
【００１４】請求項７記載の第７の発明は、請求項３又
は６記載において、内外管（７）（８）の両端部（７
ａ）（８ａ）を相互にスポット溶接（Ｗ1 ）にて固着し
てフランジ（１０）の接続短管（１０ｂ）に嵌合し、そ
の嵌合端とフランジ（１０）とをアーク溶接（Ｗ2 ）に
て固着したことを特徴とするものである。A seventh invention according to claim 7 is the third invention according to claim 3 or 6, wherein both end portions (7) of the inner and outer pipes (7) and (8) are
a) and (8a) are fixed to each other by spot welding (W 1 ) and fitted into the connecting short pipe (10b) of the flange (10), and the fitting end and the flange (10) are arc welded (W). It is characterized by being fixed in 2 ).
【００１５】請求項８記載の第８の発明は、請求項４又
は５記載の内管（７）の端部（７ａ）をフランジ（１
０）の接続短管（１０ｂ）にスポット溶接にて固着した
ことを特徴とするものである。In an eighth aspect of the present invention as defined in claim 8, the end portion (7a) of the inner pipe (7) according to claim 4 or 5 is provided with a flange (1).
It is characterized by being fixed to the connecting short pipe (10b) of 0) by spot welding.
【００１６】[0016]
【発明の実施の形態】図１は本発明の第１実施例を示
す。６は排気管で、図示しないエンジンと、該エンジン
の排気を浄化する触媒コンバータとの間に設けられるも
ので、金属製の内管７の外部に、それよりは大径の金属
製の外管８を適宜隙間Ｄ2 を存した状態で略同心的に配
置してなる二重管で形成されている。外管８の肉厚は強
度保持部材としての機能を発揮し得る寸法、例えば１．
５〜２．５ｍｍに設定され、内管７の肉厚は、その熱容
量を小さくできるように外管８よりもかなり薄く、例え
ば０．６〜０．８ｍｍに設定されている。FIG. 1 shows a first embodiment of the present invention. Reference numeral 6 denotes an exhaust pipe, which is provided between an engine (not shown) and a catalytic converter that purifies exhaust gas of the engine. The exhaust pipe 6 is provided outside the metal inner pipe 7 and has a larger diameter than that. It is formed of a double tube in which 8 is arranged substantially concentrically with a gap D 2 appropriately present. The wall thickness of the outer tube 8 is a dimension capable of exerting a function as a strength holding member, for example, 1.
The thickness of the inner tube 7 is set to 5 to 2.5 mm, and the wall thickness of the inner tube 7 is set to be considerably smaller than that of the outer tube 8 so as to reduce the heat capacity thereof, for example, 0.6 to 0.8 mm.
【００１７】上記隙間Ｄ2 内には、断熱性を有するグラ
スウール等の断熱材９が充填されている。尚、この断熱
材９を充填せずに隙間Ｄ2 内を空洞にしてもよい。上記
内管７の端部７ａは直管に形成され、外管８の端部８ａ
は小径に絞って内管７の外面に重合されている。そし
て、両端部７ａ，８ａは相互にスポット溶接Ｗ1 により
固着されている。The gap D 2 is filled with a heat insulating material 9 such as glass wool having a heat insulating property. It should be noted that the space D 2 may be hollow without filling the heat insulating material 9. The end portion 7a of the inner pipe 7 is formed as a straight pipe, and the end portion 8a of the outer pipe 8 is formed.
Are narrowed to a small diameter and are superposed on the outer surface of the inner tube 7. Both ends 7a, 8a are fixed to each other by spot welding W 1 .
【００１８】１０は金属の薄板で形成したフランジであ
る。尚、通常、鋼板において薄板という場合は数ミリ程
度の肉厚のものを指し、本発明の薄板も数ミリ程度の肉
厚を意味するものである。そして、実施に際しては、肉
厚Ｄ3 が約３ｍｍ前後の金属板をプレス加工により折曲
してフランジ１０が形成されている。フランジ１０の断
面形状は、一般平面部１０ａにポート１０ｅを貫通形成
するとともにそのポート１０ｅの周囲を内外管７，８が
接続される側に折曲して形成した接続短管１０ｂと、一
般平面部１０ａの外周部を上記接続短管１０ｂの折曲方
向へ折曲して形成した外周壁１０ｃとからなるコ字状に
形成されている。また、これにより、フランジ１０の一
般平面部１０ａの中央部に、上記接続短管１０ｂの内面
を嵌合面１０ｄとした円形のポート１０ｅが形成されて
いる。また、接続短管１０ｂと外周壁１０ｃの前後方向
長、すなわち、軸方向長は所定の強度を発揮し得るに必
要かつ十分な短さに設定されており、接続短管１０ｂの
長さＤ4は例えば１２ｍｍに設定されている。また、外
周壁１０ｂは接続短管１０ｂより若干短く設定されてい
る。尚、上記の外周壁１０ｃは必ずしも必要ではなく、
一般平面部１０ａのみで強度上十分ならば外周壁１０ｃ
は不要である。また、上記のポート１０ｅは円形である
必要はなく、任意の断面形状でよい。Reference numeral 10 is a flange formed of a thin metal plate. In general, a thin plate of a steel plate means a thickness of about several millimeters, and the thin plate of the present invention also means a thickness of about several millimeters. Then, in practice, the flange 10 is formed by bending a metal plate having a wall thickness D 3 of about 3 mm by press working. The cross-sectional shape of the flange 10 includes a connecting short pipe 10b formed by penetrating the port 10e in the general flat surface portion 10a and bending the periphery of the port 10e to the side to which the inner and outer pipes 7 and 8 are connected, and a general flat surface. The outer peripheral portion of the portion 10a is formed in a U-shape including an outer peripheral wall 10c formed by bending the connecting short pipe 10b in the bending direction. Further, thereby, a circular port 10e having the inner surface of the connecting short pipe 10b as the fitting surface 10d is formed at the center of the general flat surface portion 10a of the flange 10. Further, the length in the front-rear direction of the connecting short pipe 10b and the outer peripheral wall 10c, that is, the axial length is set to a length that is necessary and sufficient for exhibiting a predetermined strength, and the length D 4 of the connecting short pipe 10b is set. Is set to, for example, 12 mm. The outer peripheral wall 10b is set to be slightly shorter than the connecting short pipe 10b. The outer peripheral wall 10c is not always necessary,
If only the general plane portion 10a is sufficient for strength, the outer peripheral wall 10c
Is unnecessary. Further, the port 10e does not have to be circular and may have any cross-sectional shape.
【００１９】そして、上記内外管７，８とフランジ１０
との組立ては、内外管７，８間に断熱材９を介在して内
外管７，８の重合した端部７ａ，８ａをスポット溶接Ｗ
1 により固着し、その外管８の端部８ａをフランジ１０
における接続短管１０ｂの嵌合面１０ｄに嵌合し、その
端部８ａの端面とフランジ１０とをすみ肉溶接等のアー
ク溶接Ｗ2 にて固着する。Then, the inner and outer tubes 7 and 8 and the flange 10 are
In order to assemble the above, the end portions 7a, 8a of the inner and outer pipes 7, 8 that have been polymerized are spot-welded W by interposing a heat insulating material 9 between the inner and outer pipes 7, 8.
1 by fixed, flange 10 the ends 8a of the outer tube 8
Is fitted to the fitting surface 10d of the connecting short pipe 10b, and the end surface of the end portion 8a and the flange 10 are fixed by arc welding W 2 such as fillet welding.
【００２０】本実施例においては、フランジ１０を金属
の薄板にしてその熱容量を小さくしたので、エンジン始
動時において、排気熱におけるフランジ１０の昇温へ費
やされる熱量が少なくなる。そのため、熱容量の小さい
薄肉の内外管７，８と相まってエンジンの冷間始動時に
おける排気熱の浪費が少なくなり、触媒の早期昇温が図
られる。In this embodiment, since the flange 10 is made of a thin metal plate to reduce its heat capacity, the amount of heat consumed by the exhaust heat to raise the temperature of the flange 10 is reduced when the engine is started. Therefore, waste of exhaust heat at the time of cold starting of the engine is reduced together with the thin inner and outer pipes 7 and 8 having a small heat capacity, and the temperature of the catalyst can be quickly raised.
【００２１】また、フランジ１０を薄板にしてその熱容
量を排気管６、より詳しくは外管８の熱容量に近づけた
ので、溶接時におけるこれらの熱容量差が少なくなり、
従来のような外管が溶け落ちて溶接が困難になることを
防止できる。Further, since the flange 10 is made a thin plate and its heat capacity is brought close to the heat capacity of the exhaust pipe 6, more specifically, the outer pipe 8, the difference between these heat capacities during welding is reduced,
It is possible to prevent the conventional outer pipe from melting down and making welding difficult.
【００２２】更に、内外管７，８を予め相互にスポット
溶接してこれをフランジ１０に溶接組付けするため製造
が容易になる。更に、フランジ１０は、金属の薄板をプ
レス加工して形成できるため材料費や加工費が安くな
り、製品コストが安価で、かつ製品が軽量になる。Further, since the inner and outer pipes 7 and 8 are previously spot-welded to each other and are welded and assembled to the flange 10, manufacturing is facilitated. Further, since the flange 10 can be formed by pressing a thin metal plate, the material cost and the processing cost are low, the product cost is low, and the product is lightweight.
【００２３】図２は本発明の第２実施例を示す。本実施
例は、上記第１実施例における内管７の端部７ａをフラ
ンジ１０の接続短管１０ｂに直接嵌合してその端面をア
ーク溶接Ｗ2 にてフランジ１０に固着し、また、外管８
の端部８ａを内管７の外面に重合するとともにその端面
をフランジ１０における接続短管１０ｂの端面に当接し
てアーク溶接Ｗ2 により固着したものである。その他の
構造は上記第１実施例と同様であるので同一部分には同
一符号を付してその説明は省略する。FIG. 2 shows a second embodiment of the present invention. This embodiment is fixed to the end face fitted directly to an end portion 7a of the inner tube 7 to the short connection tube 10b of the flange 10 to the flange 10 by an arc welding W 2 in the first embodiment, also, the outer Tube 8
End portion 8a of the inner tube 7 is superposed on the outer surface of the inner tube 7, and the end surface is brought into contact with the end surface of the connecting short tube 10b of the flange 10 and fixed by arc welding W 2 . Since the other structure is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.
【００２４】本第２実施例においては、上記第１実施例
と同様の作用、効果を発揮する上に、上記第１実施例に
比べてフランジ部におけるポート１０ｅの開口面積が外
管８の板厚分広くとれ、排気ガスの流通を向上できる。In the second embodiment, the same action and effect as those of the first embodiment are exhibited, and the opening area of the port 10e in the flange portion is larger than that of the first embodiment in the plate of the outer tube 8. The thickness is wide and the flow of exhaust gas can be improved.
【００２５】図３は本発明の第３実施例を示す。本実施
例は、上記第２実施例における外管８の端部８ａを内管
７に重合することなくフランジ１０における接続短管１
０ｂの外面に嵌合したもので、その他の構造は上記第２
実施例と同様である。上記第２実施例と同一部分には同
一部号を付してその説明は省略する。FIG. 3 shows a third embodiment of the present invention. In this embodiment, the connecting short pipe 1 in the flange 10 is formed without overlapping the end portion 8a of the outer pipe 8 with the inner pipe 7 in the second embodiment.
It is fitted to the outer surface of 0b.
This is the same as the embodiment. The same parts as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００２６】本第３実施例においても上記第２実施例と
同一の作用、効果を発揮する。図４は本発明の第４実施
例を示す。本実施例は、上記第３実施例における内管７
の端部７ａをフランジ１０における接続短管１０ｂにお
ける嵌合面１０ｄに、フランジ１０と溶接することなく
単に嵌合したもので、その他の構造は上記第３実施例と
同様である。上記第３実施例と同一部分には同一符号を
付してその説明は省略する。Also in the third embodiment, the same operation and effect as those of the second embodiment are exhibited. FIG. 4 shows a fourth embodiment of the present invention. This embodiment is the same as the inner pipe 7 in the third embodiment.
The end portion 7a is simply fitted to the fitting surface 10d of the connecting short pipe 10b of the flange 10 without welding to the flange 10, and the other structure is the same as that of the third embodiment. The same parts as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００２７】本第４実施例においては、上記第３実施例
の作用、効果を発揮する上に、内管７が固定されていな
いのでその熱膨張に伴う応力の発生を防ぐことができ
る。図５は本発明の第５実施例を示す。In the fourth embodiment, in addition to exerting the action and effect of the third embodiment, since the inner pipe 7 is not fixed, it is possible to prevent the generation of stress due to its thermal expansion. FIG. 5 shows a fifth embodiment of the present invention.
【００２８】本実施例は、外管８を直管とし、内管７の
端部７ａを拡径してその端部７ａと外管８の端部８ａを
相互にスポット溶接Ｗ1 にて固着し、その両端部７ａ，
８ａをフランジ１０における接続短管１０ｂの外面に嵌
合し、かつその両端部７ａ，８ａの端面をアーク溶接Ｗ
2 でフランジ１０に固着したものである。その他の構造
は上記第１実施例と同様であるので同一部分には同一符
号を付してその説明は省略する。In this embodiment, the outer pipe 8 is a straight pipe, the end portion 7a of the inner pipe 7 is expanded, and the end portion 7a and the end portion 8a of the outer pipe 8 are fixed to each other by spot welding W 1 . And both ends 7a,
8a is fitted to the outer surface of the connecting short pipe 10b in the flange 10, and the end surfaces of both end portions 7a, 8a thereof are arc welded W.
It is fixed to the flange 10 at 2 . Since the other structure is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.
【００２９】本第５実施例においては、上記第１実施例
の作用、効果を発揮する上に、フランジ１０におけるポ
ート１０ｅの開口面積を、上記各実施例のものよりも広
くすることができ、排気ガスの流通を向上できる。In the fifth embodiment, in addition to exerting the action and effect of the first embodiment, the opening area of the port 10e in the flange 10 can be made wider than that of each of the above embodiments. The flow of exhaust gas can be improved.
【００３０】尚、上記図２、図３に示す実施例におい
て、その内管７の端部７ａをフランジ１０の接続短管１
０ｂにアーク溶接ではなくスポット溶接で固定してもよ
い。In the embodiment shown in FIGS. 2 and 3, the end portion 7a of the inner pipe 7 is connected to the flange 10 by the connecting short pipe 1.
It may be fixed to 0b by spot welding instead of arc welding.
【００３１】[0031]
【発明の効果】以上のようであるから、請求項１乃至８
記載の発明によれば、フランジ（１０）を薄板にしてそ
の熱容量を小さくしたので、エンジン始動時において、
排気熱におけるフランジ（１０）の昇温へ費やされる熱
量が少なくなる。そのため、熱容量の小さい薄肉の内外
管（７）（８）と相まってエンジンの冷間始動時におけ
る排気熱の浪費が少なくなり、触媒の早期昇温が図られ
る。As described above, according to the first to eighth aspects of the invention.
According to the described invention, the flange (10) is made thin to reduce its heat capacity.
The amount of heat consumed for raising the temperature of the flange (10) in the exhaust heat is reduced. Therefore, waste of exhaust heat at the time of cold starting of the engine is reduced in combination with the thin inner and outer pipes (7) and (8) having a small heat capacity, and the temperature of the catalyst can be quickly raised.
【００３２】更に、フランジ（１０）を薄板にして排気
管の熱容量に近づけたので、溶接時におけるこれらの熱
容量差が少なくなり、従来のような外管が溶け落ちて溶
接が困難になることを防止できる。更に、フランジを薄
板から簡単に形成できるため、製造コストが安価でかつ
軽量になる。Furthermore, since the flange (10) is made a thin plate to be close to the heat capacity of the exhaust pipe, the difference in heat capacities at the time of welding is reduced, and it is difficult to weld the outer pipe as in the conventional case, which makes welding difficult. It can be prevented. Further, since the flange can be easily formed from a thin plate, the manufacturing cost is low and the weight is low.
【００３３】請求項４及び５記載の発明によれば、更
に、フランジ部におけるポート開口面積が広くとれ、排
気ガスの流通を向上できる。請求項６記載の発明によれ
ば、更により一層フランジ部におけるポート開口面積が
広くとれ、排気ガスの流通を向上できる。According to the fourth and fifth aspects of the invention, the port opening area in the flange portion can be further widened, and the flow of exhaust gas can be improved. According to the invention described in claim 6, the port opening area in the flange portion can be further increased, and the flow of exhaust gas can be improved.
【００３４】請求項７記載の発明によれば、更に、内外
管を予め相互にスポット溶接してこれをフランジに溶接
組付けできるため、製造が容易になる。According to the invention of claim 7, the inner and outer tubes can be spot-welded to each other in advance and welded and assembled to the flange, which facilitates the manufacturing.
【図１】本発明の第１実施例を示す側断面図。FIG. 1 is a side sectional view showing a first embodiment of the present invention.
【図２】本発明の第２実施例を示す側断面図。FIG. 2 is a side sectional view showing a second embodiment of the present invention.
【図３】本発明の第３実施例を示す側断面図。FIG. 3 is a side sectional view showing a third embodiment of the present invention.
【図４】本発明の第４実施例を示す側断面図。FIG. 4 is a side sectional view showing a fourth embodiment of the present invention.
【図５】本発明の第５実施例を示す側断面図。FIG. 5 is a sectional side view showing a fifth embodiment of the present invention.
【図６】第１の従来構造を示す側断面図。FIG. 6 is a side sectional view showing a first conventional structure.
【図７】第２の従来構造を示す側断面図。FIG. 7 is a side sectional view showing a second conventional structure.
６…排気管 ７…内管 ７ａ…端部 ８…外管 ８ａ…端部 １０…フランジ １０ａ…前壁 １０ｂ…接続短管 Ｗ1 …スポット溶接 Ｗ2 …アーク溶接6 ... exhaust pipe 7 ... inner tube 7a ... end 8 ... outer tube 8a ... end 10 ... flange 10a ... front wall 10b ... short connection pipe W 1 ... spot welding W 2 ... arc welding
Claims (8)
の端部にフランジを溶接固定するものにおいて、 上記フランジ（１０）を、金属の薄板で形成したことを
特徴とする排気二重管。1. An exhaust double pipe, wherein the exhaust pipe is constituted by inner and outer pipes, and a flange is welded and fixed to an end portion of the exhaust pipe, wherein the flange (10) is formed of a thin metal plate. tube.
の端部にフランジを溶接固定するものにおいて、 上記フランジを、プレス加工による金属の薄板の折り曲
げにより、一般平面部（１０ａ）と一般平面部（１０
ａ）から一体的に突設した接続短管（１０ｂ）とで形成
するとともに、内管（７）か外管（８）の少なくとも一
方を接続短管（１０ｂ）に溶接固定したことを特徴とす
る排気二重管。2. An exhaust pipe comprising inner and outer pipes, wherein a flange is welded and fixed to an end of the exhaust pipe, wherein the flange is formed into a general flat surface portion (10a) by bending a thin metal plate by press working. General plane part (10
and a connecting short pipe (10b) integrally protruding from a), and at least one of the inner pipe (7) and the outer pipe (8) is welded and fixed to the connecting short pipe (10b). Exhaust double pipe.
内管（７）と外管（８）の両端部（７ａ）（８ａ）を重
合し、その外管（８）の端部（８ａ）をフランジ（１
０）の接続短管（１０ｂ）の内面に嵌合したことを特徴
とする排気二重管。3. The ends (7a) (8a) of the inner pipe (7) and the outer pipe (8) constituting the exhaust pipe (6) according to claim 2 are polymerized, and the ends of the outer pipe (8) are polymerized. Replace the part (8a) with the flange (1
An exhaust double pipe fitted to the inner surface of the connecting short pipe (10b) of 0).
内管（７）の端部（７ａ）がフランジ（１０）における
接続短管（１０ｂ）の内面に嵌合され、外管（８）の端
面が接続短管（１０ｂ）の端面に当接していることを特
徴とする排気二重管。4. The end portion (7a) of the inner pipe (7) constituting the exhaust pipe (6) according to claim 2, is fitted to the inner surface of the connecting short pipe (10b) in the flange (10), and the outer pipe is formed. An exhaust double pipe in which the end face of (8) is in contact with the end face of the connecting short pipe (10b).
内管（７）の端部（７ａ）がフランジ（１０）における
接続短管（１０ｂ）の内面に嵌合され、外管（８）の端
部（８ａ）が接続短管（１０ｂ）の外面に嵌合されてい
ることを特徴とする排気二重管。5. The end portion (7a) of the inner pipe (7) constituting the exhaust pipe (6) according to claim 2, is fitted to the inner surface of the connecting short pipe (10b) in the flange (10), and the outer pipe is formed. An exhaust double pipe, wherein an end (8a) of (8) is fitted to an outer surface of a connecting short pipe (10b).
管（７）の端部（７ａ）と外管（８）の端部（８ａ）を
重合し、その内管（７）の端部（７ａ）をフランジ（１
０）における接続短管（１０ｂ）の外面に嵌合したこと
を特徴とする排気二重管。6. The exhaust pipe (6) according to claim 2, wherein the end portion (7a) of the inner pipe (7) and the end portion (8a) of the outer pipe (8) are polymerized to form the inner pipe (7). Connect the end (7a) to the flange (1
An exhaust double pipe fitted to the outer surface of the connecting short pipe (10b) in 0).
（７）（８）の両端部（７ａ）（８ａ）を相互にスポッ
ト溶接（Ｗ1 ）にて固着してフランジ（１０）の接続短
管（１０ｂ）に嵌合し、その嵌合端とフランジ（１０）
とをアーク溶接（Ｗ2 ）にて固着したことを特徴とする
排気二重管。7. The flange (10) according to claim 3 or 6, wherein both ends (7a) (8a) of the inner and outer tubes (7) and (8) are fixed to each other by spot welding (W 1 ). Fits in the short pipe (10b), and the fitting end and the flange (10)
An exhaust double pipe characterized in that and are fixed by arc welding (W 2 ).
（７ａ）をフランジ（１０）の接続短管（１０ｂ）にス
ポット溶接にて固着したことを特徴とする排気二重管。8. A dual exhaust system, characterized in that the end portion (7a) of the inner pipe (7) according to claim 4 or 5 is fixed to the connecting short pipe (10b) of the flange (10) by spot welding. tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31340495A JPH09151730A (en) | 1995-12-01 | 1995-12-01 | Exhaust double pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31340495A JPH09151730A (en) | 1995-12-01 | 1995-12-01 | Exhaust double pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09151730A true JPH09151730A (en) | 1997-06-10 |
Family
ID=18040871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31340495A Pending JPH09151730A (en) | 1995-12-01 | 1995-12-01 | Exhaust double pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09151730A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006192445A (en) * | 2005-01-11 | 2006-07-27 | Calsonic Kansei Corp | Structure for positioning pipe end joint of duplex pipe to be welded to another member |
| JP2009057862A (en) * | 2007-08-30 | 2009-03-19 | Hino Motors Ltd | Heat insulation exhaust pipe |
| JP2011012598A (en) * | 2009-07-02 | 2011-01-20 | Yanmar Co Ltd | Exhaust emission control device |
| EP2314840A1 (en) | 2009-10-20 | 2011-04-27 | Nakagawa Sangyo Co., Ltd. | Heat insulator for a vehicle exhaust pipe, vehicle pipe and methods for manufacturing the same |
| JP2012082836A (en) * | 2011-12-22 | 2012-04-26 | Yanmar Co Ltd | Exhaust emission purifying apparatus |
| JP2014040836A (en) * | 2013-09-30 | 2014-03-06 | Yanmar Co Ltd | Engine device |
| JP2014040834A (en) * | 2013-09-30 | 2014-03-06 | Yanmar Co Ltd | Engine device |
| CN113631846A (en) * | 2019-01-29 | 2021-11-09 | 肯发系统有限公司 | Welding cap and plug welding for fluid delivery systems |
-
1995
- 1995-12-01 JP JP31340495A patent/JPH09151730A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006192445A (en) * | 2005-01-11 | 2006-07-27 | Calsonic Kansei Corp | Structure for positioning pipe end joint of duplex pipe to be welded to another member |
| JP2009057862A (en) * | 2007-08-30 | 2009-03-19 | Hino Motors Ltd | Heat insulation exhaust pipe |
| JP2011012598A (en) * | 2009-07-02 | 2011-01-20 | Yanmar Co Ltd | Exhaust emission control device |
| EP2314840A1 (en) | 2009-10-20 | 2011-04-27 | Nakagawa Sangyo Co., Ltd. | Heat insulator for a vehicle exhaust pipe, vehicle pipe and methods for manufacturing the same |
| JP2012082836A (en) * | 2011-12-22 | 2012-04-26 | Yanmar Co Ltd | Exhaust emission purifying apparatus |
| JP2014040836A (en) * | 2013-09-30 | 2014-03-06 | Yanmar Co Ltd | Engine device |
| JP2014040834A (en) * | 2013-09-30 | 2014-03-06 | Yanmar Co Ltd | Engine device |
| CN113631846A (en) * | 2019-01-29 | 2021-11-09 | 肯发系统有限公司 | Welding cap and plug welding for fluid delivery systems |
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