JPH11294156A - Exhaust device for vehicular engine - Google Patents
Exhaust device for vehicular engineInfo
- Publication number
- JPH11294156A JPH11294156A JP10451698A JP10451698A JPH11294156A JP H11294156 A JPH11294156 A JP H11294156A JP 10451698 A JP10451698 A JP 10451698A JP 10451698 A JP10451698 A JP 10451698A JP H11294156 A JPH11294156 A JP H11294156A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- exhaust pipe
- partition plate
- welding
- engine
- 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.)
- Granted
Links
Landscapes
- Exhaust Silencers (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は自動車等の車両用エンジ
ンの排気装置、特に多気筒エンジンの排気装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for a vehicle engine such as an automobile, and more particularly to an exhaust system for a multi-cylinder engine.
【0002】[0002]
【従来の技術】上記のような排気装置は、一般にエンジ
ンの排気マニホルドに、いわゆるフロントパイプと称す
る排気管を接続し、その排気管の下流側に、排気ガスを
浄化するための触媒コンバータや消音用のマフラ等を接
続した構成である。この場合、多気筒エンジンにあって
は排気マニホルドから直接1本の排気管に合流させる
と、エンジンにバックプレッシャが掛かって出力が低下
するため、排気管を気筒数に対応して複数本設けたり、
あるいは各気筒からの排気のうち互いに干渉するおそれ
の少ない排気をマニホルド内で合流させて複数本の排気
管に導いたのち1本の排気管に合流させる等の方法が採
られている。2. Description of the Related Art An exhaust system as described above generally connects an exhaust pipe called a front pipe to an exhaust manifold of an engine, and a downstream side of the exhaust pipe is provided with a catalytic converter for purifying exhaust gas and a silencer. Are connected. In this case, in the case of a multi-cylinder engine, if the exhaust manifold directly joins one exhaust pipe, the engine is back-pressured and the output decreases, so that a plurality of exhaust pipes may be provided corresponding to the number of cylinders. ,
Alternatively, a method is adopted in which exhaust gases, which are less likely to interfere with each other, of the exhaust gases from the cylinders are joined in the manifold, guided to a plurality of exhaust pipes, and then joined to one exhaust pipe.
【0003】例えば4気筒のエンジンにおいては、その
4つの気筒からの排気のうち、互いに干渉するおそれの
少ない2気筒ずつをマニホルド内で合流させて2本の排
気管に導き、その2本の排気管を1本の排気管に合流さ
せて触媒コンバータやマフラに導くようにしている。[0003] For example, in a four-cylinder engine, of the four exhaust cylinders, two cylinders, each of which is less likely to interfere with each other, are joined together in the manifold and led to two exhaust pipes, and the two exhaust pipes are exhausted. The pipes are merged into one exhaust pipe so as to lead to a catalytic converter and a muffler.
【0004】ところが、上記のように排気管を複数本並
べて配置するものは、大きな設置スペースを必要とし、
自動車等の車両用エンジンの排気装置にあっては、車体
底部の限られた空間内に設置するのが困難である場合が
少なくない。しかも、表面積が大きいため、下流に設置
する触媒コンバータに至るまでに排気温度が低下して排
気浄化性能が低下する等の不具合がある。However, the arrangement of a plurality of exhaust pipes as described above requires a large installation space,
2. Description of the Related Art It is often difficult to install an exhaust system for a vehicle engine such as an automobile in a limited space at the bottom of a vehicle body. In addition, since the surface area is large, there is a problem that the exhaust gas temperature is lowered before reaching the catalytic converter installed downstream and the exhaust purification performance is reduced.
【0005】そこで、例えば排気マニホルドから触媒コ
ンバータに至る排気管内を仕切板で仕切ったり、あるい
は排気管自体を断面S字状に形成することによって、1
つの排気管内に複数個の排気通路を形成することが提案
されている(例えば実開昭63−196425号、特開
平9−264128号公報参照)。[0005] Therefore, for example, the inside of the exhaust pipe from the exhaust manifold to the catalytic converter is partitioned by a partition plate, or the exhaust pipe itself is formed into an S-shaped cross section, thereby reducing the number of parts.
It has been proposed to form a plurality of exhaust passages in one exhaust pipe (for example, see Japanese Utility Model Application Laid-Open No. 63-196425 and Japanese Patent Application Laid-Open No. 9-264128).
【0006】[0006]
【発明が解決しようとする課題】しかしながら、前者の
ように排気管内を仕切板で仕切るものは、例えば図6お
よび図7に示すように仕切板2の幅方向両端部2a・2
aを互いに反対方向に折り曲げて排気管1の内面に溶接
等で固着するのが一般的である。この場合、上記仕切板
2は図7に示すように左右非対称であるため安定性が悪
く、溶接時はその不安定な状態で排気管内に治具等を挿
入して溶接しなけらばならないので作業性が悪い等の不
具合がある。また溶接時には、治具に溶接スパッタが付
着して溶接精度を損ねたり、治具を頻繁に清掃もしくは
交換する必要があり、さらには溶接スパッタが管内に付
着し、その箇所から腐食が発生する等の問題があった。However, in the former, the inside of the exhaust pipe is partitioned by a partition plate, as shown in FIGS. 6 and 7, for example, as shown in FIG. 6 and FIG.
In general, a is bent in opposite directions and fixed to the inner surface of the exhaust pipe 1 by welding or the like. In this case, since the partition plate 2 is asymmetrical as shown in FIG. 7, the stability is poor. At the time of welding, it is necessary to insert a jig or the like into the exhaust pipe in an unstable state and perform welding. There are problems such as poor workability. At the time of welding, welding spatter adheres to the jig and impairs welding accuracy, and the jig needs to be cleaned or replaced frequently.Furthermore, welding spatter adheres to the inside of the pipe, causing corrosion from that location. There was a problem.
【0007】さらに上記のような溶接作業を行う際に
は、溶接強度を向上させるため、あるいは溶接部やその
周辺からの腐食を防止するために、バックシールドガス
と称する不活性ガスを流しながら溶接する方法がある
が、車両用エンジン等の排気管にあっては、管内の容積
が比較的大きいため、多量のガスを必要とし、実用上は
殆ど適用不可能であった。Further, when performing the above welding work, in order to improve welding strength or to prevent corrosion from the welded portion and its surroundings, the welding is performed while flowing an inert gas called a back shield gas. However, the exhaust pipe of a vehicle engine or the like requires a large amount of gas since the pipe has a relatively large volume, and is practically not applicable.
【0008】本発明は上記従来の問題点に鑑みて提案さ
れたもので、製作が容易で、強度が強く、しかも耐腐食
性に優れ、排気洩れ等の生じるおそれの少ない排気装置
を提供することを目的とする。The present invention has been proposed in view of the above-mentioned conventional problems, and provides an exhaust device which is easy to manufacture, has high strength, has excellent corrosion resistance, and has a low possibility of causing exhaust leakage. With the goal.
【0009】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明による車両用エンジンの排気装置は、以下の
構成としたものである。即ち、エンジンの排気マニホル
ドの下流側に接続される排気管内を仕切板により仕切っ
て複数個の排気通路を形成するようにした車両用エンジ
ンの排気装置において、上記仕切板の排気管内面と当接
する端部を袋状に形成したことを特徴とする。To achieve the above object, an exhaust system for a vehicle engine according to the present invention has the following arrangement. That is, in an exhaust device for a vehicle engine in which a plurality of exhaust passages are formed by partitioning the inside of an exhaust pipe connected to the downstream side of an exhaust manifold of the engine with a partition plate, the exhaust pipe contacts the inner surface of the exhaust pipe of the partition plate. The end portion is formed in a bag shape.
【0010】[0010]
【発明の実施の形態】以下、本発明による車両用エンジ
ンの排気装置を、図に示す実施形態に基づいて具体的に
説明する。図1は本発明による排気装置の一実施形態を
示す縦断面図、図2(a)および(b)は図1における
A−AおよびB−B線断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an exhaust system for a vehicle engine according to the present invention will be specifically described based on an embodiment shown in the drawings. FIG. 1 is a longitudinal sectional view showing one embodiment of the exhaust device according to the present invention, and FIGS. 2A and 2B are sectional views taken along lines AA and BB in FIG.
【0011】図示例の排気装置は、排気管1内に仕切板
2を配置し、その仕切板2の排気管内面と当接する幅方
向両端部21・21を袋状に形成すると共に、仕切板2
の幅方向ほぼ中央部には屈曲部22が形成されている。
上記袋状の端部21は上記屈曲部22により排気管1の
内面に弾力的に且つ気密に密着し、その密着部に溶接W
を施すことによって、上記仕切板2と排気管1とが一体
に固着されている。また袋状端部21の上流側(図1で
左上)の端縁21sは、図2(a)に示すように扁平に
押し潰すことによって閉塞され、それによって袋状端部
21内に排気ガスが流入しないようにしている。In the illustrated exhaust device, a partition plate 2 is disposed in an exhaust pipe 1, and both ends 21 in the width direction of the partition plate 2 which are in contact with the inner surface of the exhaust pipe are formed in a bag shape. 2
A bent portion 22 is formed substantially at the center in the width direction.
The bag-shaped end 21 is elastically and air-tightly adhered to the inner surface of the exhaust pipe 1 by the bent portion 22, and a weld W
, The partition plate 2 and the exhaust pipe 1 are integrally fixed. The edge 21s on the upstream side (upper left in FIG. 1) of the bag-like end 21 is closed by being squashed flat as shown in FIG. To prevent inflow.
【0012】図1において、11・12は上記排気管1
の上流側と下流側の端部に設けた接続用フランジで、そ
の上流側のフランジ11によって図に省略したエンジン
の排気マニホルドに上記排気管1が接続され、また下流
側のフランジ12に触媒コンバータが接続されると共
に、その下流側にはマフラ等が接続されるが図には省略
した。In FIG. 1, reference numerals 11 and 12 denote the exhaust pipe 1
Connection flanges provided at the upstream and downstream ends of the engine, the exhaust pipe 1 is connected to an exhaust manifold of an engine (not shown) by an upstream flange 11, and a catalytic converter is connected to a downstream flange 12. Are connected, and a muffler and the like are connected downstream thereof, but they are omitted in the figure.
【0013】上記排気装置を構成する部材の材質や寸法
等は適宜であるが、本実施形態における排気管1および
仕切板2の材質としては、それぞれステンレス鋼板(S
US430M)が用いられている。また排気管1の板厚
は0.8mmで、外径は65mmに形成されている。こ
れに対し、仕切板2の板厚は1.2mm以上とするのが
好ましく、本実施形態においては1.2mmのものが用
いられている。Although the materials and dimensions of the members constituting the exhaust device are appropriate, the materials of the exhaust pipe 1 and the partition plate 2 in this embodiment are stainless steel plates (S
US430M). The exhaust pipe 1 has a thickness of 0.8 mm and an outer diameter of 65 mm. On the other hand, it is preferable that the plate thickness of the partition plate 2 is 1.2 mm or more, and in the present embodiment, the plate thickness is 1.2 mm.
【0014】また袋状端部21の断面形状や寸法等も適
宜であるが、図示例の袋状端部21の断面形状は図2
(b)に示すように略三角形状に形成され、その袋状端
部21の図2で左右方向の最大幅は約10mmに形成さ
れている。また袋状端部21の排気管内面との接触部
は、該排気管内面と略同じ曲率の円弧面に形成され、該
接触部の排気管周方向の長さ(接触幅)は約7mm程度
である。The sectional shape and dimensions of the bag-like end 21 are also appropriate, but the sectional shape of the bag-like end 21 in the illustrated example is shown in FIG.
2 (b), the bag-shaped end 21 has a maximum width in the left-right direction of about 10 mm in FIG. The contact portion of the bag-shaped end portion 21 with the inner surface of the exhaust pipe is formed on an arc surface having substantially the same curvature as the inner surface of the exhaust pipe, and the length (contact width) of the contact portion in the circumferential direction of the exhaust pipe is about 7 mm. It is.
【0015】さらに上記排気管1や仕切板2の製造方法
等は任意であり、例えば排気管1と仕切板2とを、それ
ぞれプレス成形やロール成形、その他の製法によって予
め個別に製造した後、それらを組み合わせる。あるいは
ロール成形等によって排気管1と仕切板2とを同時に成
形しながら連続的に組み合わせて一体化することもでき
る。The method of manufacturing the exhaust pipe 1 and the partition plate 2 is arbitrary. For example, the exhaust pipe 1 and the partition plate 2 are individually manufactured in advance by press forming, roll forming, or other manufacturing methods. Combine them. Alternatively, the exhaust pipe 1 and the partition plate 2 can be integrally combined by being continuously formed while being simultaneously formed by roll forming or the like.
【0016】図3は排気管1と仕切板2とを個別に製造
して組み合わせる場合の一例を示すもので、同図(a)
のように予め円形管状に形成し且つ所定の長さに切断さ
れた排気管1を、図に省略した押圧部材等により左右両
側から押すことによって楕円形状に変形させ、その排気
管1内にその一端側から仕切板2を挿入する。その状態
で上記の押圧部材を排除すれば排気管1は、その弾性復
元力で同図(b)のように元の円形形状に戻り、仕切板
2は排気管1の直径方向に起立した状態に位置決め保持
される。FIG. 3 shows an example in which the exhaust pipe 1 and the partition plate 2 are separately manufactured and combined, and FIG.
The exhaust pipe 1 previously formed into a circular tubular shape and cut into a predetermined length as described above is deformed into an elliptical shape by being pressed from both right and left sides by a pressing member or the like not shown in the drawing, and the exhaust pipe 1 is placed in the exhaust pipe 1. The partition plate 2 is inserted from one end side. If the above-mentioned pressing member is removed in that state, the exhaust pipe 1 returns to its original circular shape as shown in FIG. 3B by its elastic restoring force, and the partition plate 2 stands in the diameter direction of the exhaust pipe 1. Is held in position.
【0017】特に、本発明の仕切板2の幅方向両端部2
1・21は袋状に形成され、その袋状端部21と排気管
内面との接触部は前記のように所定の幅を有し、しかも
上記接触部は図示例においては仕切板2の中央部の板面
に対して左右略対称であるため排気管1の中央に安定性
よく位置決め保持させることができる。なお、この場
合、仕切板2の幅、すなわち図3(b)における上下方
向の長さを排気管1の内径(直径)よりもやや大きめに
形成するか、排気管1の少なくとも仕切板幅方向の内径
を仕切板2の幅よりも小さめに形成しておけば、同図
(b)のように排気管1内に仕切板2を装着したときに
該仕切板2を排気管内面に更に良好に密着固定させるこ
とができる。In particular, both ends 2 in the width direction of the partition plate 2 of the present invention
1 and 21 are formed in a bag shape, and the contact portion between the bag-shaped end portion 21 and the inner surface of the exhaust pipe has a predetermined width as described above, and the contact portion is located at the center of the partition plate 2 in the illustrated example. Since it is substantially symmetrical with respect to the plate surface of the portion, it can be stably positioned and held at the center of the exhaust pipe 1. In this case, the width of the partition plate 2, that is, the length in the vertical direction in FIG. 3B is formed to be slightly larger than the inner diameter (diameter) of the exhaust pipe 1, or at least in the partition plate width direction of the exhaust pipe 1. Is formed to be smaller than the width of the partition plate 2, when the partition plate 2 is mounted in the exhaust pipe 1 as shown in FIG. Can be tightly fixed.
【0018】次に、上記仕切板2の袋状端部21と排気
管内面とを、溶接W等によって一体的に固着するもの
で、その溶接方法としては、例えばレーザー溶接や高周
波溶接等を適用することができる。又その際、仕切板2
は排気管1内に安定性よく位置決め保持されるので、必
ずしも強固な治具は必要がなく、簡易治具で簡単・確実
に固定することができる。また場合によっては治具を省
略することもできる。Next, the bag-like end 21 of the partition plate 2 and the inner surface of the exhaust pipe are integrally fixed by welding W or the like. As a welding method, for example, laser welding, high-frequency welding, or the like is applied. can do. At that time, the partition plate 2
Is stably positioned and held in the exhaust pipe 1, so that a strong jig is not necessarily required, and a simple jig can be used to easily and reliably fix the jig. In some cases, the jig can be omitted.
【0019】図4は排気管1と仕切板2とを同時に成形
しながら連続的に組み合わせて一体化する場合の製造方
法の一例を示す。ロール状に巻いた仕切板2の素材板2
0を順次繰り出しながら多数の成形用ローラ3で所定形
状の仕切板2を順次成形する。それと同時に排気管1を
形成するための平板状の素材板10を多数の成形用ロー
ラ4により順次円形に湾曲させ、その内方に仕切板2を
包み込むようにして素材板10を筒状に丸めながら端部
を突き合わせて溶接W1すると共に、仕切板2の袋状の
両端部21を排気管内面に密着させて溶接Wすればよ
い。本例においても仕切板は略対称であるため倒れるこ
となく排気管の中央に位置させることができる。FIG. 4 shows an example of a manufacturing method in a case where the exhaust pipe 1 and the partition plate 2 are continuously combined while being formed simultaneously and integrated. Material plate 2 of partition plate 2 wound in a roll
While sequentially feeding 0, the partition plate 2 having a predetermined shape is sequentially formed by a large number of forming rollers 3. At the same time, the flat material plate 10 for forming the exhaust pipe 1 is sequentially curved into a circular shape by a number of forming rollers 4, and the material plate 10 is rounded into a cylindrical shape so as to wrap the partition plate 2 inward. Welding W1 may be performed by welding the ends while abutting the ends, and bringing the bag-shaped ends 21 of the partition plate 2 into close contact with the inner surface of the exhaust pipe. Also in this example, since the partition plate is substantially symmetric, it can be positioned at the center of the exhaust pipe without falling down.
【0020】なお上記実施形態においては図4(b)に
示すように筒状に丸めた素材板10の両端部を仕切板2
の側方位置で溶接W1したが、仕切板2の袋状端部21
の外面位置で該仕切板2と一体に溶接するようにしても
よい。In the above embodiment, as shown in FIG.
Was welded at the lateral position of
May be integrally welded to the partition plate 2 at the outer surface position.
【0021】前記のようにして排気管1と仕切板2とを
一体化した後は、車両底部等への配置形状に合わせて適
宜曲げ加工を施すもので、その場合、仕切板2に前記の
ような屈曲部22を形成すると、上記の曲げ加工を施す
際の応力緩和、および実車装着時に排気温による仕切板
の収縮に対する応力緩和等の機能が発揮され、仕切板と
管との溶接部が剥離したり分離するのを未然に防止する
ことが可能となる。After the exhaust pipe 1 and the partition plate 2 are integrated as described above, they are appropriately bent in accordance with the shape of the arrangement on the vehicle bottom or the like. When such a bent portion 22 is formed, functions such as stress relaxation at the time of performing the bending process and stress relaxation against shrinkage of the partition plate due to the exhaust temperature when the vehicle is mounted on the vehicle are exhibited, and the welded portion between the partition plate and the pipe is formed. Peeling or separation can be prevented beforehand.
【0022】また上記曲げ加工の曲げがきつく、前記袋
状端部21の合わせ縁部21aが開くおそれがある場合
には、例えば図5に示すように袋状端部21の合わせ縁
部21aを仕切板2の幅方向中央部の板面に延長して該
板面に添わせ、その板面と上記縁部21aとを溶接W2
するようにしてもよい。If there is a possibility that the bending edge of the bag-shaped end 21 may be opened due to the sharp bending of the bending process, for example, as shown in FIG. The partition plate 2 is extended to the plate surface at the center in the width direction of the partition plate 2 and is attached to the plate surface.
You may make it.
【0023】前記従来の図6・図7の構造では、前述の
ように仕切板2は左右非対称であるため安定性が悪く、
溶接時には、ほとんど余裕空間のない治具を使用せざる
を得ず、作業性が悪い等の不具合があったが、本発明に
よる上記の実施形態においては仕切板2が略対称である
ため安定性がよく、治具に余裕が持たせられる。また従
来の仕切板2の両端折曲部(へミング部)2aは、いわ
ゆる波打ちが生じやすく、排気管の内方側に波打ちした
部分は排気管との間に隙間が生じて溶接不良となり、安
定した溶接が得にくい等の問題があるが、本発明におい
ては仕切板2の両端部21を袋状に形成し、その端部2
1の縁部21aは仕切板本体に付き当てることにより、
波打ち等が生じることなく、しかも端部21を排気管内
面に付き当てるようにしたので、良好かつ安定に溶接固
定することができる。また排気管使用時においても上記
溶接部やその近傍に腐食性の排気ガスが直接触れること
がないので耐食性を向上させることができる。In the above-mentioned conventional structure shown in FIGS. 6 and 7, since the partition plate 2 is asymmetrical as described above, the stability is poor.
At the time of welding, a jig having almost no extra space had to be used, and there were problems such as poor workability. However, in the above embodiment according to the present invention, since the partition plate 2 is substantially symmetric, Is good, and the jig has room. In addition, the bending portion (heming portion) 2a at both ends of the conventional partition plate 2 is apt to cause so-called waving, and a wavy portion on the inner side of the exhaust pipe has a gap between the exhaust pipe and the weld, resulting in poor welding. Although there is a problem that it is difficult to obtain stable welding, in the present invention, both ends 21 of the partition plate 2 are formed in a bag shape and the ends 2 are formed.
The first edge 21a is brought into contact with the partition plate body,
Since the end 21 is brought into contact with the inner surface of the exhaust pipe without causing waving or the like, welding and fixing can be performed satisfactorily and stably. In addition, even when the exhaust pipe is used, the corrosive exhaust gas does not directly come into contact with the welded portion or its vicinity, so that the corrosion resistance can be improved.
【0024】さらに上記の溶接作業は、一般に排気管外
部から行われ、従来は溶接スパッタ等が排気管に飛散
し、排気管内面に付着して腐食の原因となったり、溶接
スパッタが溶接治具に付着して溶接精度を損ねたり、頻
繁に治具を清掃もしくは交換しなければならない等の問
題があったが、本発明においては上記溶接スパッタ等は
袋状の端部21内に回収されて排気管内には飛散しない
ので上記のような問題点も良好に解消することができる
ものである。Further, the above welding operation is generally performed from the outside of the exhaust pipe. Conventionally, welding spatter or the like scatters on the exhaust pipe and adheres to the inner surface of the exhaust pipe to cause corrosion, or welding spatter is generated by a welding jig. However, the welding spatter and the like are collected in the bag-shaped end portion 21 in the present invention. Since the particles do not scatter in the exhaust pipe, the above-mentioned problems can be solved satisfactorily.
【0025】また排気管1に溶接する仕切板2の両端部
21を袋状にしたことによって、排気管1内における溶
接領域と接する空間の容積を狭くすることができるた
め、上記袋状端部21にバックシールドガスを流しなが
ら溶接することが可能となる。それによって、溶接強度
を高めることができると共に、溶接時に活性ガス等で溶
接部やその近傍が変質することがなく腐食の発生を低減
することができる。Further, by forming both ends 21 of the partition plate 2 to be welded to the exhaust pipe 1 in a bag shape, the volume of the space in contact with the welding area in the exhaust pipe 1 can be reduced, so that the bag-shaped end portion is formed. It is possible to perform welding while flowing a back shield gas to the gas. Thereby, the welding strength can be increased, and the occurrence of corrosion can be reduced without deterioration of the welded portion and its vicinity by active gas or the like during welding.
【0026】なお上記実施形態においては、排気管1を
1重としたが、例えばエンジンから触媒コンバータに至
るまでに排気温度が低下するのを防止するために上記排
気管1の外周に、断熱用の外管を被覆するようにしても
よい。その場合、上記排気管1と上記外管との間は中空
にして空気断熱層とする、あるいは上記排気管と外管と
の間にグラスウール等の断熱材等を充填してもよい。In the above-described embodiment, the exhaust pipe 1 is made single, but, for example, in order to prevent the exhaust gas temperature from dropping from the engine to the catalytic converter, a heat insulating material is provided around the outer circumference of the exhaust pipe 1. May be coated. In this case, the space between the exhaust pipe 1 and the outer pipe may be hollow to form an air heat insulating layer, or the space between the exhaust pipe and the outer pipe may be filled with a heat insulating material such as glass wool.
【0027】[0027]
【発明の効果】以上説明したように本発明は、エンジン
の排気マニホルドの下流側に接続される排気管1内を仕
切板2により仕切って複数個の排気通路を形成するよう
にした車両用エンジンの排気装置において、上記仕切板
2の排気管内面と当接する端部21を袋状に形成したか
ら、仕切板2の両端部を排気管内面に弾力的に良好に且
つ安定に密着保持させることができる。そのため、上記
仕切板両端部と排気管内面とを溶接する際には、仕切板
2を必ずしも強固な治具等を用いることなく固定できる
と共に、排気管使用時においても上記溶接部やその近傍
に排気ガスが直接触れることがないので腐食が少なく耐
久性を大幅に向上させることができる。さらに溶接時に
は、治具に溶接スパッタが付着せず、治具を頻繁に清掃
もしくは交換する必要がなく管内にも付着しない。また
上記袋状端部21にバックシールドガスを流しながら溶
接することが可能となり、溶接強度を高めることができ
ると共に、溶接時に活性ガス等で溶接部やその近傍が変
質して腐食の原因となるのを防止できる等の効果があ
る。As described above, the present invention provides a vehicle engine in which a plurality of exhaust passages are formed by partitioning an exhaust pipe 1 connected to a downstream side of an exhaust manifold of an engine by a partition plate 2. In the exhaust device described above, since the end 21 of the partition plate 2 that contacts the inner surface of the exhaust pipe is formed in a bag shape, both ends of the partition plate 2 are elastically and stably held in close contact with the inner surface of the exhaust pipe. Can be. Therefore, when welding both ends of the partition plate and the inner surface of the exhaust pipe, the partition plate 2 can be fixed without necessarily using a strong jig or the like. Since the exhaust gas does not come into direct contact, corrosion is small and durability can be greatly improved. Further, at the time of welding, welding spatter does not adhere to the jig, so that the jig does not need to be frequently cleaned or replaced, and does not adhere to the inside of the pipe. In addition, it is possible to perform welding while flowing a back shield gas to the bag-shaped end portion 21, thereby increasing the welding strength, and at the time of welding, the welded portion and its vicinity are deteriorated by active gas or the like, which causes corrosion. And the like.
【図1】本発明による車両用エンジンの排気装置の一実
施形態を示す一部縦断側面図。FIG. 1 is a partially longitudinal side view showing an embodiment of an exhaust device for a vehicle engine according to the present invention.
【図2】(a)および(b)は図1におけるA−Aおよ
びB−B線拡大断面図。FIGS. 2A and 2B are enlarged cross-sectional views taken along lines AA and BB in FIG.
【図3】(a)および(b)は上記排気装置の製法の一
例を示す説明図。FIGS. 3A and 3B are explanatory diagrams illustrating an example of a method of manufacturing the exhaust device.
【図4】(a)は上記排気装置の製法の他の例を示す説
明図。(b)、(c)、(d)は(a)におけるB−
B、C−C、D−D線断面図。FIG. 4A is an explanatory view showing another example of a method of manufacturing the exhaust device. (B), (c), and (d) show B- in (a).
B, CC, DD sectional drawing.
【図5】本発明による車両用エンジンの排気装置の他の
実施形態を示す断面図。FIG. 5 is a sectional view showing another embodiment of the exhaust device for a vehicle engine according to the present invention.
【図6】従来の排気装置の一例を示す一部縦断側面図。FIG. 6 is a partially longitudinal side view showing an example of a conventional exhaust device.
【図7】図6におけるE−E線拡大断面図。FIG. 7 is an enlarged sectional view taken along line EE in FIG. 6;
1 排気管 2 仕切板 11、12 接続用フランジ 21 袋状端部 22 屈曲部 REFERENCE SIGNS LIST 1 exhaust pipe 2 partition plate 11, 12 connection flange 21 bag-like end 22 bent part
Claims (3)
続される排気管内を仕切板により仕切って複数個の排気
通路を形成するようにした車両用エンジンの排気装置に
おいて、上記仕切板の排気管内面と当接する端部を袋状
に形成したことを特徴とする車両用エンジンの排気装
置。1. An exhaust system for a vehicle engine in which an exhaust pipe connected to a downstream side of an exhaust manifold of the engine is partitioned by a partition plate to form a plurality of exhaust passages. An exhaust device for a vehicle engine, wherein an end portion of the exhaust device is formed in a bag shape.
当接部を溶接により一体的に固着してなる請求項1記載
の車両用エンジンの排気装置。2. The exhaust system for a vehicle engine according to claim 1, wherein a contact portion between the bag-like end of the partition plate and the inner surface of the exhaust pipe is integrally fixed by welding.
を形成してなる請求項1または2記載の車両用エンジン
の排気装置。3. The exhaust device for a vehicle engine according to claim 1, wherein a bent portion is formed at a substantially central portion in a width direction of the partition plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10451698A JP4083284B2 (en) | 1998-04-15 | 1998-04-15 | Exhaust device for vehicle engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10451698A JP4083284B2 (en) | 1998-04-15 | 1998-04-15 | Exhaust device for vehicle engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH11294156A true JPH11294156A (en) | 1999-10-26 |
JP4083284B2 JP4083284B2 (en) | 2008-04-30 |
Family
ID=14382669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10451698A Expired - Lifetime JP4083284B2 (en) | 1998-04-15 | 1998-04-15 | Exhaust device for vehicle engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4083284B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1329606A2 (en) * | 2002-01-17 | 2003-07-23 | Nissan Motor Company, Limited | Exhaust arrangement for internal combustion engine |
-
1998
- 1998-04-15 JP JP10451698A patent/JP4083284B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1329606A2 (en) * | 2002-01-17 | 2003-07-23 | Nissan Motor Company, Limited | Exhaust arrangement for internal combustion engine |
EP1329606A3 (en) * | 2002-01-17 | 2003-11-05 | Nissan Motor Company, Limited | Exhaust arrangement for internal combustion engine |
US6722126B2 (en) | 2002-01-17 | 2004-04-20 | Nissan Motor Co., Ltd. | Exhaust arrangement for internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JP4083284B2 (en) | 2008-04-30 |
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