JPH0861058A - Steel pipe-made exhaust manifold of multi-cylinder engine and manufacture thereof - Google Patents
Steel pipe-made exhaust manifold of multi-cylinder engine and manufacture thereofInfo
- Publication number
- JPH0861058A JPH0861058A JP19339194A JP19339194A JPH0861058A JP H0861058 A JPH0861058 A JP H0861058A JP 19339194 A JP19339194 A JP 19339194A JP 19339194 A JP19339194 A JP 19339194A JP H0861058 A JPH0861058 A JP H0861058A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- pipe
- exhaust pipes
- thermal expansion
- axial direction
- 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)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明は、鋼管を使用した多気
筒エンジンの排気マニホールドの構造およびその製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an exhaust manifold of a multi-cylinder engine using a steel pipe and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】一般に各気筒毎の排気管を一体的に形成
した多気筒エンジンの排気マニホールドは、耐熱性の点
から鋳鉄で形成されているケースが多いが、鋳鉄性のも
のはかなり重くなり、エンジン自体の軽量化を損ねる。
また、内面の流体抵抗も大きい。2. Description of the Related Art Generally, an exhaust manifold of a multi-cylinder engine in which an exhaust pipe for each cylinder is integrally formed is often made of cast iron from the viewpoint of heat resistance, but a cast iron type is considerably heavy. , Impairs the weight reduction of the engine itself.
Also, the fluid resistance on the inner surface is large.
【０００３】このため、例えば実開平５−１８１９号公
報に示されるように、上記各気筒毎の排気管を鋼管で形
成、つまりステンレス鋼等の鋼製パイプ材を排気干渉を
招くことがないように曲げ加工して上記各排気管を含む
排気マニホールドを形成することにより、軽量化と流体
抵抗の低減を図るようにしたものが提案されている。こ
のように排気マニホールドの各排気管が鋼管製とされた
場合に、その排気下流側集合部の構造としては、一般に
各鋼管製排気管の排気下流側端部が一体に収束され、こ
の集束部がさらに一本の集合管に嵌合状態で接合される
ことになる。Therefore, as disclosed in Japanese Utility Model Laid-Open No. 5-1819, for example, the exhaust pipe for each cylinder is formed of a steel pipe, that is, a steel pipe material such as stainless steel does not cause exhaust interference. It has been proposed that the exhaust manifold including the above exhaust pipes is formed by bending into a hollow shape to reduce the weight and the fluid resistance. In this way, when each exhaust pipe of the exhaust manifold is made of steel pipe, the structure of the exhaust downstream side collecting part is generally such that the exhaust downstream side end part of each steel pipe exhaust pipe is converged integrally and this collecting part Will be joined to one collecting pipe in a fitted state.
【０００４】該従来の多気筒エンジンにおける鋼管製排
気マニホールドの構造の一例を図５〜図７に示す。An example of the structure of a steel pipe exhaust manifold in the conventional multi-cylinder engine is shown in FIGS.
【０００５】本例では、多気筒エンジンとして、例えば
直列４気筒エンジン(図示省略)が採用されており、それ
に対応して例えば図５に示すような構造の不干渉型の排
気マニホールド１が設けられている。In this example, as a multi-cylinder engine, for example, an in-line 4-cylinder engine (not shown) is adopted, and correspondingly, a non-interference type exhaust manifold 1 having a structure as shown in FIG. 5 is provided. ing.
【０００６】該排気マニホールド１は、上記直列４気筒
エンジンの第１〜第４の各気筒Ｎo１〜Ｎo４に対応した
第１〜第４の各排気管１１〜１４を有し、それら各排気
管１１〜１４の排気上流側端部１１a〜１４aにはエンジ
ン本体側の排気口部と接合するためのフランジ部２が一
体形成されている一方、他方、排気下流側端部１１b〜
１４bは図５、図６に示すように収束一体化されてい
る。該集束部３における上記各排気管１１〜１４の排気
下流側端部１１b〜１４bの各々は、それぞれ図６に示す
ように断面略扇形をなし、相交錯するＸ−Ｙ軸方向のコ
ーナ部の２片同士が全体として略円形断面を形成するよ
うに嵌合され、かつ相互に溶接されて接合一体化されて
いる。そして、該一体化された円筒形の集束部３に対し
て下流側一本の集合管との接続用ブラケット４が嵌合さ
れるようになっている。The exhaust manifold 1 has first to fourth exhaust pipes 11 to 14 corresponding to the first to fourth cylinders No1 to No4 of the in-line four-cylinder engine, and the exhaust pipes 11 to 14 are provided. Flange portions 2 for joining to the exhaust port portion on the engine body side are integrally formed on the exhaust upstream side end portions 11a to 14a, while the exhaust downstream side end portion 11b to
14b is converged and integrated as shown in FIGS. Each of the exhaust downstream side end portions 11b to 14b of the exhaust pipes 11 to 14 in the converging portion 3 has a substantially fan-shaped cross section as shown in FIG. 6, and the corner portions in the XY axial directions intersect with each other. The two pieces are fitted together so as to form a substantially circular cross section as a whole, and are welded to each other to be joined and integrated. Then, a bracket 4 for connecting with one downstream collecting pipe is fitted to the integrated cylindrical converging portion 3.
【０００７】そして、上記収束された排気管各下流側端
部１１b〜１４bの溶接部は、例えば図７から明らかなよ
うに、上側左右に並列する共に管長の長い第１の排気管
１１および第４の排気管１４の各下部壁と下側左右に並
列する共に管長の短かい第２の排気管１２および第３の
排気管１３の各上壁部との接合ラインＬＸと左側上下に
並列する管長差の大きい第１の排気管１１と第２の排気
管１２の各縦壁部と右側に位置して上下に並列する管長
差の大きい第４の排気管１４と第３の排気管１３の各縦
壁部との接合ラインＬＹとに、各々当該接合ラインＬ
Ｘ,ＬＹのＬＹ側を先ず先に溶着した後、続いてＬＸ側
を溶着することにより接合されており、その結果、形成
された各接合ラインのＬＸ,ＬＹの溶接ビードＢＸ,ＢＹ
は、上記接合ラインＬＹ側の溶接ビードＢＹの方が接合
ラインＬＸ側の溶接ビードＢＸの排気上流側に位置して
集束部３中央Ｏ点部でクロスする構造となっている。Then, the welded portions of the converged exhaust pipe downstream end portions 11b to 14b are arranged in parallel on the left and right sides of the first exhaust pipe 11 and the first exhaust pipe 11 having a long pipe length, as is apparent from FIG. 4 are arranged in parallel to the lower walls of the four exhaust pipes 14 and to the lower left and right, and are arranged vertically to the left and above the joining line LX with the upper wall portions of the second exhaust pipe 12 and the third exhaust pipe 13 having short pipe lengths. The first exhaust pipe 11 and the second exhaust pipe 12 having a large pipe length difference are vertically arranged in parallel with each other on the vertical wall portions of the fourth exhaust pipe 14 and the third exhaust pipe 13 having a large pipe length difference. Each of the joining lines L and the joining line LY with each vertical wall
The LY side of X and LY is welded first, and then the LX side is welded, and as a result, the weld beads BX and BY of LX and LY of the formed joining lines are joined.
Has a structure in which the welding bead BY on the joining line LY side is located on the exhaust upstream side of the welding bead BX on the joining line LX side and crosses at the center O point of the focusing portion 3.
【０００８】[0008]
【発明が解決しようとする課題】ところが、図５のよう
な多気筒エンジンの鋼管製排気マニホールドの場合、上
述のように、その気筒位置との関係で上記集束部３まで
の各排気管１１〜１４の長さおよび曲成状態が異なり、
それに応じてエンジン運転時における各々の軸方向の熱
伸び量も相当に異なる。However, in the case of a steel pipe exhaust manifold for a multi-cylinder engine as shown in FIG. 5, as described above, the exhaust pipes 11 to 11 up to the converging portion 3 are related to the cylinder position. 14 length and bending state are different,
Correspondingly, the amount of thermal expansion in each axial direction during engine operation also differs considerably.
【０００９】その結果、上側左右に位置する共に管長の
長い第１および第４の排気管１１,１４の熱伸び量が下
側左右に位置する共に管長の短かい第２、第３の排気管
１２,１３の熱伸び量よりも相当に大きく、しかも第
１、第４の排気管１１,１４同士の溶接ビードＢＹは中
央Ｏ点部では溶接ビードＢＸによっても拘束されてい
る。従って、特に伸び変形側と拘束部との境界点である
Ｐ1点部分の溶接ビードＢＹに応力歪みによるクラック
(図面の手前側の折れ)が発生する問題がある。その結
果、シール性が害される。As a result, the first and fourth exhaust pipes 11 and 14 located on the upper left and right sides and having a long pipe length have the thermal expansion amounts located on the lower left and right sides, and the second and third exhaust pipes having a short pipe length. The weld bead BY of the first and fourth exhaust pipes 11 and 14 is also restrained by the weld bead BX at the central O point, which is considerably larger than the thermal elongation of 12 and 13. Therefore, cracks due to stress strain are generated especially in the weld bead BY at the point P 1 which is the boundary point between the extension deformation side and the restraint.
There is a problem that (folding on the front side of the drawing) occurs. As a result, the sealing property is impaired.
【００１０】本願発明は、このような問題を解決するこ
とを目的とするものである。The present invention aims to solve such a problem.
【００１１】[0011]
【課題を解決するための手段】本願発明の多気筒エンジ
ンの鋼管製排気マニホールドおよびその製造方法は、上
記の目的を達成するために、それぞれ次のような有効な
課題解決手段を備えて構成されている。The steel pipe exhaust manifold for a multi-cylinder engine and the method of manufacturing the same according to the present invention are each provided with the following effective problem solving means in order to achieve the above object. ing.
【００１２】すなわち、先ず本願発明の多気筒エンジン
の鋼管製排気マニホールドは、軸方向への熱伸び量が異
なる少なくとも３本の鋼管製排気管を排気下流側端部で
相互に集束させるとともに該集束部の各排気管の相互に
隣接する管壁部間を溶接することにより一体化してなる
多気筒エンジンの鋼管製排気マニホールドであって、上
記集束部中央において軸方向への熱伸び量の差が大きい
排気管同士の管壁部間の溶接ビードが軸方向への熱伸び
量の差が小さい排気管同士の管壁部間の溶接ビードより
も排気上流側に位置して重合されて形成されている。That is, first, in the steel pipe-made exhaust manifold of the multi-cylinder engine of the present invention, at least three steel pipe-made exhaust pipes having different amounts of thermal expansion in the axial direction are mutually focused at the exhaust downstream end and Is a steel pipe exhaust manifold of a multi-cylinder engine that is integrated by welding between mutually adjacent pipe wall portions of the exhaust pipe of the section, the difference in the amount of thermal expansion in the axial direction at the center of the focusing portion is The weld bead between the pipe walls of the large exhaust pipes is formed by being superposed on the exhaust upstream side of the weld bead between the pipe walls of the exhaust pipes with a small difference in the amount of thermal expansion in the axial direction. There is.
【００１３】また、その場合、集束部中央の溶接ビード
重合部における排気下流側溶接ビードの溶接方向は、軸
方向への熱伸び量が大きい排気管同士の管壁部間側から
軸方向への熱伸び量が小さい排気管同士の管壁部間側方
向、又はその逆の方向に向けて溶接されて形成されてい
る。Further, in that case, the welding direction of the exhaust bead on the downstream side of the exhaust gas at the weld bead overlapping portion at the center of the converging portion is from the side between the pipe wall portions of the exhaust pipes having a large thermal expansion in the axial direction to the axial direction. It is formed by welding in a direction between pipe wall portions of exhaust pipes having a small amount of thermal expansion, or in the opposite direction.
【００１４】さらに、また、本願発明の多気筒エンジン
の鋼管製排気マニホールドは、第１および第４の排気管
の管長が第２、第３の排気管の管長よりも長い第１〜第
４の４本の排気管を排気下流側端部で相互に集束させる
とともに該集束部の各排気管の相互に隣接する管壁部間
を溶接することにより一体化してなる直列４気筒エンジ
ンの鋼管製排気マニホールドであって、上記集束部中央
において上記第１の排気管および第４の排気管と上記第
２の排気管および第３の排気管との管壁部間の溶接ビー
ドが上記第１の排気管および第２の排気管と上記第４の
排気管および第３の排気管との管壁部間の溶接ビードよ
りも排気上流側に位置して重合されて形成されている。Further, in the steel pipe exhaust manifold of the multi-cylinder engine of the present invention, the first and fourth exhaust pipes have the pipe lengths longer than the pipe lengths of the second and third exhaust pipes. Steel pipe exhaust of in-line 4-cylinder engine in which four exhaust pipes are bundled together at the exhaust downstream side end and the exhaust pipes of the converging part are integrated by welding between mutually adjacent pipe wall portions In the manifold, the weld bead between the pipe walls of the first exhaust pipe and the fourth exhaust pipe and the second exhaust pipe and the third exhaust pipe at the center of the focusing portion has the first exhaust pipe. The pipe and the second exhaust pipe and the fourth exhaust pipe and the third exhaust pipe are formed by being superposed on the exhaust upstream side of the weld bead between the pipe wall portions.
【００１５】また、本願発明の多気筒エンジンの鋼管製
排気マニホールドの製造方法は、軸方向への熱伸び量が
異なる少なくとも３本の鋼管製排気管を排気下流側端部
で相互に集束させるとともに該集束部の各排気管の相互
に隣接する管壁部間を溶接することにより一体化してな
る多気筒エンジンの鋼管製排気マニホールドの製造方法
であって、先ず最初に軸方向への熱伸び量の差が大きい
排気管同士の管壁部間の溶接を行ない、次いで軸方向へ
の熱伸び量の差が小さい排気管同士の管壁部間の溶接を
行うことにより、上記集束部における各排気管の相互に
隣接する管壁部間を接合するように構成されている。Further, in the method for manufacturing a steel pipe exhaust manifold for a multi-cylinder engine of the present invention, at least three steel pipe exhaust pipes having different amounts of thermal expansion in the axial direction are mutually focused at the exhaust downstream end. A method for manufacturing an exhaust manifold made of steel pipe for a multi-cylinder engine, wherein the exhaust pipes of the converging part are integrated by welding the mutually adjacent pipe wall parts, and first, the amount of thermal expansion in the axial direction is first. Of the exhaust pipes having a large difference between the exhaust pipes, and then the pipe walls of the exhaust pipes having a small difference in the amount of thermal expansion in the axial direction are welded to each other. It is configured to join the mutually adjacent tube wall portions of the tube.
【００１６】さらに、また、その場合において、後から
行われる軸方向への熱伸び量の差が小さい排気管同士の
管壁部間の溶接は、軸方向への熱伸び量が大きい排気管
同士の管壁部間側から軸方向への熱伸び量が小さい排気
管同士の管壁部間側方向、又はその逆の方向に向けて行
うようになっている。Furthermore, in that case, the welding between the pipe wall portions of the exhaust pipes, which has a small difference in the thermal expansion amount in the axial direction, which is performed later, is performed between the exhaust pipes having a large thermal expansion amount in the axial direction. Is performed in the direction between the pipe wall portions of the exhaust pipes having a small amount of thermal expansion in the axial direction from the side between the pipe wall portions, or in the opposite direction.
【００１７】[0017]
【作用】本願発明の多気筒エンジンの鋼管製排気マニホ
ールドおよびその製造方法は、上記構成に対応して各々
次のような作用を奏する。The steel pipe exhaust manifold for a multi-cylinder engine and the method of manufacturing the same according to the present invention have the following operations corresponding to the above-described configurations.
【００１８】すなわち、先ず本願発明の多気筒エンジン
の鋼管製排気マニホールドの構成では、上述のように、
軸方向への熱伸び量が異なる少なくとも３本の鋼管製排
気管を排気下流側端部で相互に集束させるとともに該集
束部の各排気管の相互に隣接する管壁部間を溶接するこ
とにより一体化してなる多気筒エンジンの鋼管製排気マ
ニホールドであって、上記集束部中央において軸方向へ
の熱伸び量の差が大きい排気管同士の管壁部間の溶接ビ
ードが軸方向への熱伸び量の差が小さい排気管同士の管
壁部間の溶接ビードよりも排気上流側に位置して重合状
態になるように形成されており、軸方向への熱伸び量の
差が小さい排気管同士の管壁部間の溶接ビードの拘束力
は小さくなり、上記熱伸び量の差による応力を同溶接ビ
ードの曲がりによって吸収することができるようにな
り、クラック抑止作用が実現される。That is, first, in the structure of the steel pipe exhaust manifold of the multi-cylinder engine of the present invention, as described above,
By concentrating at least three steel pipe exhaust pipes having different amounts of thermal expansion in the axial direction at the exhaust downstream end, and by welding the mutually adjacent pipe wall portions of the exhaust pipes of the converging portion. In a steel pipe exhaust manifold of a multi-cylinder engine integrated, the welding bead between the pipe wall portions of the exhaust pipes having a large difference in the amount of thermal expansion in the axial direction at the center of the converging portion has a thermal expansion in the axial direction. Exhaust pipes that have a small difference in the amount of heat and are formed so as to be in a superposed state on the exhaust upstream side of the weld bead between the pipe walls of the exhaust pipes, and that have a small difference in the amount of thermal expansion in the axial direction. The restraining force of the weld bead between the pipe wall portions is reduced, and the stress due to the difference in the thermal elongation amount can be absorbed by the bending of the weld bead, and the crack suppressing action is realized.
【００１９】また、該場合において、同集束部中央の溶
接ビード重合部における排気下流側溶接ビードの溶接方
向は、軸方向への熱伸び量が大きい排気管同士の管壁部
間側から軸方向への熱伸び量が小さい排気管同士の管壁
部間側方向、又はその逆の方向に向けて溶接されて形成
されていると、当該作用が、より有効に実現される。Further, in this case, the welding direction of the exhaust downstream side welding bead in the weld bead overlapping portion in the center of the converging portion is such that the axial direction from the pipe wall portion side of the exhaust pipes is large in the axial direction. When the exhaust pipes having a small amount of thermal expansion toward the pipe wall portions are welded in the direction between the pipe wall portions or in the opposite direction, the action is more effectively realized.
【００２０】さらに、また、本願発明の多気筒エンジン
の鋼管製排気マニホールドは、第１および第４の排気管
の管長が第２、第３の排気管の管長よりも長い第１〜第
４の４本の排気管を排気下流側端部で相互に集束させる
とともに該集束部の各排気管の相互に隣接する管壁部間
を溶接することにより一体化してなる直列４気筒エンジ
ンの鋼管製排気マニホールドであって、上記集束部中央
において上記第１の排気管および第４の排気管と上記第
２の排気管および第３の排気管との管壁部間の溶接ビー
ドが上記第１の排気管および第２の排気管と上記第４の
排気管および第３の排気管との管壁部間の溶接ビードよ
りも排気上流側に位置して重合されて形成されている
と、直列４気筒エンジンの鋼管製排気マニホールドの場
合において、上記と全く同様の作用を実現することがで
きる。Further, in the steel pipe exhaust manifold of the multi-cylinder engine of the present invention, the first and fourth exhaust pipes have the pipe lengths longer than the pipe lengths of the second and third exhaust pipes. Steel pipe exhaust of in-line 4-cylinder engine in which four exhaust pipes are bundled together at the exhaust downstream side end and the exhaust pipes of the converging part are integrated by welding between mutually adjacent pipe wall portions In the manifold, the weld bead between the pipe walls of the first exhaust pipe and the fourth exhaust pipe and the second exhaust pipe and the third exhaust pipe at the center of the focusing portion has the first exhaust pipe. The in-line four-cylinder is formed by being overlapped and formed on the exhaust upstream side of the weld bead between the pipe wall portions of the pipe and the second exhaust pipe and the fourth exhaust pipe and the third exhaust pipe. In the case of an engine steel pipe exhaust manifold, Ku can achieve similar effects.
【００２１】また、本願発明の多気筒エンジンの鋼管製
排気マニホールドの製造方法のように、軸方向への熱伸
び量が異なる少なくとも３本の鋼管製排気管を排気下流
側端部で相互に集束させるとともに該集束部の各排気管
の相互に隣接する管壁部間を溶接することにより一体化
してなる多気筒エンジンの鋼管製排気マニホールドの製
造方法であって、先ず最初に軸方向への熱伸び量の差が
大きい排気管同士の管壁部間の溶接を行ない、次いで軸
方向への熱伸び量の差が小さい排気管同士の管壁部間の
溶接を行うことにより、上記集束部における各排気管の
相互に隣接する管壁部間を接合するようにすると、結局
集束部中央において、軸方向への熱伸び量の差が大きい
排気管同士の管壁部間の溶接ビードが軸方向への熱伸び
量の差が小さい排気管同士の管壁部間の溶接ビードより
も排気上流側に位置して重合形成されるようになり、上
記と同様の作用を実現することができる。Further, as in the method for manufacturing a steel pipe exhaust manifold for a multi-cylinder engine according to the present invention, at least three steel pipe exhaust pipes having different axial thermal expansions are mutually focused at the exhaust downstream end. A method for manufacturing a steel pipe exhaust manifold for a multi-cylinder engine, wherein the exhaust pipes of the converging part are integrated by welding the mutually adjacent pipe wall parts to each other. By performing welding between the pipe wall portions of the exhaust pipes having a large difference in elongation amount, and then performing welding between the pipe wall portions of the exhaust pipes having a small difference in thermal elongation amount in the axial direction, If the pipe walls adjacent to each other are joined together, the weld bead between the pipe walls of the exhaust pipes in the axial direction has a large difference in the amount of thermal expansion in the axial direction at the center of the converging part. The difference in the amount of thermal expansion to Than weld bead between the tube wall of the tube between now be polymerized form positioned on the exhaust upstream side, it is possible to realize the same effect as described above.
【００２２】さらに、また、該場合において、後から行
われる軸方向への熱伸び量の差が小さい排気管同士の管
壁部間の溶接は、軸方向への熱伸び量が大きい排気管同
士の管壁部間側から軸方向への熱伸び量が小さい排気管
同士の管壁部間側方向、又はその逆の方向に向けて行う
ようにすると、上記作用をより有効に実現することがで
きる。Furthermore, in this case, the welding between the pipe wall portions of the exhaust pipes having a small thermal expansion amount in the axial direction, which is performed later, is performed by the exhaust pipes having a large thermal expansion amount in the axial direction. When the heat expansion amount from the side between the pipe wall portions in the axial direction is small toward the side between the pipe wall portions of the exhaust pipes or vice versa, the above effect can be more effectively realized. it can.
【００２３】[0023]
【発明の効果】以上の結果、本願発明の多気筒エンジン
の鋼管製排気マニホールドおよびその製造方法による
と、軸方向への熱伸び量の差が大きな排気管間の応力を
溶接ビードの曲げ変形によって吸収させ得るようにな
り、従来のような歪み応力によるクラックの発生が防止
される。従って、シール性を喪失することもない。その
結果、耐久性が向上する。As described above, according to the steel pipe exhaust manifold for a multi-cylinder engine and the method of manufacturing the same according to the present invention, stress between exhaust pipes having a large difference in the amount of thermal expansion in the axial direction is caused by bending deformation of the weld beads. As a result, the crack can be prevented from being generated due to strain stress as in the conventional case. Therefore, the sealing property is not lost. As a result, durability is improved.
【００２４】[0024]
【実施例】図１〜図３は、本願発明の実施例に係る多気
筒エンジンの鋼管製排気マニホールドの構造およびその
製造方法を示している。1 to 3 show the structure of a steel pipe exhaust manifold of a multi-cylinder engine and a method of manufacturing the same according to an embodiment of the present invention.
【００２５】本実施例では、多気筒エンジンとして、例
えば従来例の場合と同様の直列４気筒エンジンが採用さ
れており、それに対応して例えば図５に示す従来と同様
の構造の排気マニホールド１が設けられている。In this embodiment, as the multi-cylinder engine, for example, an in-line four-cylinder engine similar to that of the conventional example is adopted, and correspondingly, for example, the exhaust manifold 1 having the same structure as the conventional one shown in FIG. It is provided.
【００２６】該排気マニホールド１は、上記直列４気筒
エンジンの第１〜第４の各気筒に対応した第１〜第４の
各排気管１１〜１４を有し、それら各排気管１１〜１４
の排気上流側端部(エンジン本体側端部)１１a〜１４aに
はエンジン本体側の排気口部と接合するためのフランジ
部２が一体的に形成されている一方、他方、排気下流側
端部１１b〜１４bは図６に示すように集束一体化されて
いる。該集束部３における上記排気管１１〜１４の排気
下流側端部１１b〜１４bの各々は、それぞれ断面略扇形
をなし、縦横２つのフラットな接合壁を有するコーナ面
同士を全体として略円形断面を形成するように相互に嵌
合させて一体化するようになっている。The exhaust manifold 1 has first to fourth exhaust pipes 11 to 14 corresponding to the first to fourth cylinders of the in-line four-cylinder engine, and the exhaust pipes 11 to 14 are provided.
On the exhaust upstream side end portions (engine main body side end portions) 11a to 14a, a flange portion 2 for joining with the exhaust port portion on the engine main body side is integrally formed, while on the other hand, on the other hand, the exhaust downstream side end portion 11b to 14b are converged and integrated as shown in FIG. Each of the exhaust downstream side end portions 11b to 14b of the exhaust pipes 11 to 14 in the converging portion 3 has a substantially fan-shaped cross section, and has a substantially circular cross section as a whole with corner surfaces having two flat joint walls in the vertical and horizontal directions. As they are formed, they are fitted together and integrated.
【００２７】該嵌合は、上記直列４気筒エンジンの両端
側第１(Ｎo１)、第４(Ｎo４)気筒の管長が長く熱伸び量
が大きい第１、第４の排気管下流側端部１１b,１４bを
上部側左右に、又同直列４気筒エンジンの中間側第２
(Ｎo２)、第３(Ｎo３)気筒の管長が短く熱伸び量が小さ
い第２、第３の排気管下流側端部１２b,１３bを下部側
左右に、各々並設させた状態で実現されており、その結
果、該嵌合によって十字状に形成される第１〜第４の排
気管１１〜１４間の相互に直交するＸ−Ｙ方向２本の溶
接接合ラインＬＸ,ＬＹは、Ｘ軸方向の第１の接合ライ
ンＬＸが熱伸び量の差が大きい第２の接合ライン、Ｙ軸
方向の接合ラインＬＹが熱伸び量の差の小さい接合ライ
ンとなる。The fitting is performed by the first (No1) and fourth (No4) cylinders on both ends of the in-line four-cylinder engine, which have long pipe lengths and large thermal expansion amounts. , 14b on the left and right on the upper side, and on the middle side of the same in-line 4-cylinder engine
(No2), the third (No3) cylinder has a short pipe length and a small amount of thermal expansion. The second and third exhaust pipe downstream end portions 12b, 13b are arranged side by side on the lower left and right sides, respectively. As a result, the two welding joint lines LX and LY in the XY directions which are orthogonal to each other between the first to fourth exhaust pipes 11 to 14 formed in a cross shape by the fitting are formed in the X-axis direction. The first joining line LX is a second joining line having a large difference in thermal expansion amount, and the joining line LY in the Y-axis direction is a joining line having a small difference in thermal expansion amount.
【００２８】そして、上記集束された各排気管１１〜１
４の下流側端部１１b〜１４bの上記Ｘ−Ｙ方向２本の第
１、第２の接合ラインＬＸ,ＬＹは、図１に示すように
次のような関係で溶接される。Then, the exhaust pipes 11 to 1 each of which is focused as described above.
The two first and second joining lines LX and LY in the XY direction of the downstream end portions 11b to 14b of No. 4 are welded in the following relationship as shown in FIG.
【００２９】すなわち、先ず最初にＸ軸方向の第１の接
合ラインＬＸに沿って矢印(イ)方向(左側から右側にか
けて)の溶接を行う。この結果、図１中の符号ＢＸで示
すような溶接ビードが形成され、それによって上下に位
置する熱伸び量の差の大きな第１の排気管１１の下流側
端部１１bと第２の排気管１２の下流側端部１２bおよび
第４の排気管１４の下流側端部１４bと第３の排気管１
３の下流側端部１３bとの溶着接合が先に実現される。That is, first, welding is performed along the first joining line LX in the X-axis direction in the arrow (a) direction (from the left side to the right side). As a result, a weld bead as indicated by reference numeral BX in FIG. 1 is formed, and as a result, the downstream side end portion 11b of the first exhaust pipe 11 and the second exhaust pipe 11 having a large difference in the amount of thermal expansion located between the upper and lower sides. 12 and the downstream end 14b of the fourth exhaust pipe 14 and the third exhaust pipe 1
The welding and joining with the downstream end portion 13b of 3 is realized first.
【００３０】次に、その上でＹ軸方向の第２の接合ライ
ンＬＹに沿って矢印(ロ)方向(上側から下側にかけて)の
溶接を行う。この結果、図１〜図３中の符号ＢＹで示す
ような上記第１の溶接ビードＢＸと集束部３の中央Ｏ点
で山状に交叉重合する第２の溶接ビードが形成され、そ
れによって左右に位置する熱伸び量の差の小さな第１の
排気管１１の下流側端部１１bと第４の排気管１４の下
流側端部１４bおよび第２の排気管１２の下流側端部１
２bと第３の排気管１３の下流側端部１３bとの確実な溶
着接合が実現される。Next, welding is carried out along the second joining line LY in the Y-axis direction in the arrow (B) direction (from the upper side to the lower side). As a result, the first weld bead BX shown in FIG. 1 to FIG. 3 and the second weld bead that is cross-polymerized in a mountain shape at the center O point of the focusing portion 3 are formed. Located at the lower end of the first exhaust pipe 11 having a small difference in thermal expansion amount, the downstream end 14b of the fourth exhaust pipe 14 and the downstream end 1 of the second exhaust pipe 12.
2b and the downstream end portion 13b of the third exhaust pipe 13 are reliably welded and joined together.
【００３１】この結果、熱伸び量の差が大きく、熱伸び
時の歪応力によるクラックが発生しやすかった上記Ｐ1
点は第１、第２の２つの溶接ビードＢＸ,ＢＹの接合力
によって強固に固定されることになる一方、熱伸び応力
による歪みは、排気下流側に位置することになって拘束
力が低下した第２の溶接ビードＢＹの曲がり変形によっ
て吸収されてしまうので、Ｐ1点においても従来のよう
なクラックが発生しにくくなる。[0031] As a result, the P 1 where difference in thermal extension amount is large, cracks due to strain stress at the time of thermal expansion is likely to occur
The point is firmly fixed by the joining force of the first and second weld beads BX and BY, while the strain due to the thermal elongation stress is located on the downstream side of the exhaust gas and the restraining force is reduced. Since it is absorbed by the bending deformation of the second weld bead BY, the conventional crack is unlikely to occur at the point P 1 .
【００３２】なお、以上の実施例では、上記Ｘ軸方向第
１の接合ラインＬＸを左からの右の矢印(イ)方向に、ま
たＹ軸方向第２の接合ラインＬＹを上から下の矢印(ロ)
方向に各々溶接して行く溶接方法を採用したが、それら
２つの溶接方向は、それぞれ右から左(図示ハ方向)、下
から上(図示ニ方向)の上記とは逆の方向であっても良い
ことは言うまでもない。In the above embodiment, the first joining line LX in the X-axis direction is in the right arrow (a) direction from the left, and the second joining line LY in the Y-axis direction is from the top to the bottom arrow. (B)
We adopted the welding method of welding in each direction, but the two welding directions are right to left (direction C in the figure) and from bottom to top (direction D in the figure) opposite to the above. Not to mention good things.
【００３３】また、以上の実施例では、直列４気筒エン
ジンの排気マニホールドの場合を例として説明したが、
例えばＶ型６気筒エンジン等の左右各バンクの３本の排
気管１１〜１３を有する排気マニホールドの場合にも図
４に示すようにすれば、同様の作用効果を実現すること
ができる。In the above embodiments, the case of the exhaust manifold of the in-line 4-cylinder engine has been described as an example.
For example, in the case of an exhaust manifold having three exhaust pipes 11 to 13 in each of the left and right banks, such as a V-type 6-cylinder engine, if the configuration shown in FIG.
【００３４】すなわち、該場合においては、例えば第
１、第３、第５気筒又は第２、第４、第６気筒の内の第
１、第２,第５、第６気筒に対応する第１、第２,第５、
第６の排気管１１、１２,１５、１６の管長が長くて熱
伸び量が大きく、一方それらの間の第３、第４気筒に対
応する第３、第４の排気管１３,１４の管長が短くて熱
伸び量が小さい。そして、それら各排気管１１,１２、
１３,１４、１５,１６の各下流側端部１１b,１２b、１
３b,１４b、１５b,１６bの集束部３の嵌合状態が図示の
ようになっているとすると(なお、図には左右両バンク
側の各排気管集束部を併せて示している)、上記実施例
の場合と同様に熱伸び量の差が大きい第１、第２、第
５、第６の排気管下流側端部１１b,１２b,１５b,１６b
と第３、第４の排気管下流側端部１３b,１４bとのへの
字状の接合ラインＬＡを先ず最初に矢印(ホ)方向(又は
その逆方向)に溶接して接合する。その結果、図示ＢＡ
のようなへの字状に連続する溶接ビードが形成される。That is, in this case, for example, the first, third, fifth cylinder or the first, second, fifth, and sixth cylinders corresponding to the first, second, fifth, and sixth cylinders of the second, fourth, and sixth cylinders, for example. , Second, fifth,
The sixth exhaust pipes 11, 12, 15, 16 have a long pipe length and a large thermal expansion amount, while the third and fourth exhaust pipes 13, 14 corresponding to the third and fourth cylinders between them have the same pipe length. Is short and thermal expansion is small. And each of these exhaust pipes 11, 12,
13, 14, 15, 16 downstream end portions 11b, 12b, 1
If the fitting state of the focusing portions 3 of 3b, 14b, 15b, 16b is as shown in the drawing (note that the exhaust pipe focusing portions on both the left and right banks are also shown in the figure), Similar to the case of the embodiment, the first, second, fifth, and sixth exhaust pipe downstream-side end portions 11b, 12b, 15b, 16b having large differences in thermal expansion amount.
First, the V-shaped joining line LA between the third and fourth exhaust pipe downstream end portions 13b, 14b is welded and joined in the arrow (e) direction (or the opposite direction). As a result, illustrated BA
A continuous welding bead is formed in a V shape.
【００３５】その後、続いて熱伸び量の差が小さい第
１、第２の排気管下流側端部１１b,１２bと第５、第６
の排気管下流側端部１５b,１６bとの直線状の接合ライ
ンＬＢを矢印(ヘ)方向(又はその逆方向)に溶接して接合
する。After that, the first and second exhaust pipe downstream end portions 11b and 12b and the fifth and sixth exhaust pipes, which have a small difference in thermal expansion, are subsequently introduced.
A straight joining line LB with the exhaust pipe downstream side end portions 15b, 16b is welded and joined in the arrow (f) direction (or the opposite direction).
【００３６】その結果、図示ＢＢのような下端側が上記
への字状の第１の溶接ビードＢＡの頂点部Ｐ2に重合す
る第２の溶接ビードが形成される。As a result, a second weld bead is formed such that the lower end side thereof as shown in BB overlaps with the apex P 2 of the first V-shaped weld bead BA.
【００３７】したがって、該構成によっても、熱伸び量
の差が大きく、歪応力によるクラックが発生しやすい第
２の溶接ビードＢＢが排気下流側に位置するようにな
り、拘束力が低下して曲がり易くなるので、そのＰ2点
部でのクラックの発生が防止される。Therefore, also with this configuration, the second welding bead BB, which has a large difference in thermal expansion amount and is susceptible to cracks due to strain stress, is located on the downstream side of the exhaust gas, and the binding force is lowered to bend. Since it becomes easier, the occurrence of cracks at the point P 2 is prevented.
【図１】図１は、本願発明の実施例に係る多気筒エンジ
ンの鋼管製排気マニホールド集束部の接合後の構造を示
す拡大正面図である。FIG. 1 is an enlarged front view showing a structure after joining of a steel pipe exhaust manifold converging portion of a multi-cylinder engine according to an embodiment of the present invention.
【図２】図２は、図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図３は、図１のＢ−Ｂ線断面図である。3 is a sectional view taken along line BB of FIG.
【図４】図４は、本願発明の他の実施例に係る多気筒エ
ンジンの鋼管製排気マニホールド集束部接合後の構造を
示す拡大正面図である。FIG. 4 is an enlarged front view showing the structure of the multi-cylinder engine according to another embodiment of the present invention after joining the steel pipe exhaust manifold converging portion.
【図５】図５は、従来例および本願発明実施例に共通な
多気筒エンジンの排気マニホールドの全体的な構造を示
す正面図である。FIG. 5 is a front view showing an overall structure of an exhaust manifold of a multi-cylinder engine common to a conventional example and an embodiment of the present invention.
【図６】図６は、同図５の排気マニホールドの排気下流
側集束部接合前の状態の拡大正面図である。FIG. 6 is an enlarged front view of the exhaust manifold of FIG. 5 in a state before joining the exhaust downstream side focusing portion.
【図７】図７は、従来の多気筒エンジンの鋼管製排気マ
ニホールド集束部の接合後の状態の拡大正面図である。FIG. 7 is an enlarged front view of the state after joining the steel pipe exhaust manifold converging portion of the conventional multi-cylinder engine.
１は排気マニホールド、３は集束部、１１は第１の排気
管、１２は第２の排気管、１３は第３の排気管、１４は
第４の排気管、ＬＸ、ＬＡは第１の接合ライン、ＬＹ,
ＬＢは第２の接合ライン、ＢＸ,ＢＹは第１の溶接ビー
ド、ＢＹ,ＢＢは第２の溶接ビードである。1 is an exhaust manifold, 3 is a focusing part, 11 is a first exhaust pipe, 12 is a second exhaust pipe, 13 is a third exhaust pipe, 14 is a fourth exhaust pipe, and LX and LA are first joints. Line, LY,
LB is the second joining line, BX and BY are the first weld beads, and BY and BB are the second weld beads.
Claims (5)
３本の鋼管製排気管を排気下流側端部で相互に集束させ
るとともに該集束部の各排気管の相互に隣接する管壁部
間を溶接することにより一体化してなる多気筒エンジン
の鋼管製排気マニホールドであって、上記集束部中央に
おいて軸方向への熱伸び量の差が大きい排気管同士の管
壁部間の溶接ビードが軸方向への熱伸び量の差が小さい
排気管の管壁部間の溶接ビードよりも排気上流側に位置
して重合形成されていることを特徴とする多気筒エンジ
ンの鋼管製排気マニホールド。1. At least three steel pipe-made exhaust pipes having different amounts of thermal expansion in the axial direction are mutually focused at an end portion on the exhaust downstream side, and the exhaust pipes of the converging portion are located between mutually adjacent pipe wall portions. A steel pipe exhaust manifold for a multi-cylinder engine, which is integrated by welding, where the weld bead between the pipe wall portions of the exhaust pipes having a large difference in the amount of thermal expansion in the axial direction at the center of the converging portion is the shaft. An exhaust manifold made of steel pipe for a multi-cylinder engine, wherein the exhaust pipe is superposed and formed on the exhaust upstream side of a weld bead between the pipe wall portions of the exhaust pipe with a small difference in the amount of thermal expansion in the direction.
排気下流側溶接ビードの溶接方向は、軸方向への熱伸び
量が大きい排気管同士の管壁部間側から軸方向への熱伸
び量が小さい排気管同士の管壁部間側方向、又はその逆
の方向に向けて溶接されて形成されていることを特徴と
する請求項１記載の多気筒エンジンの鋼管製排気マニホ
ールド。2. The welding direction of the exhaust bead on the downstream side of the exhaust gas in the weld bead overlapping portion at the center of the focusing portion is such that the amount of thermal expansion in the axial direction is large in the axial direction from the side between pipe wall portions of exhaust pipes. 2. A steel pipe exhaust manifold for a multi-cylinder engine according to claim 1, wherein the exhaust pipes are formed by welding in a direction between pipe walls of small exhaust pipes or in a direction opposite thereto.
第３の排気管の管長よりも長い第１〜第４の４本の排気
管を排気下流側端部で相互に集束させるとともに該集束
部の各排気管の相互に隣接する管壁部間を溶接すること
により一体化してなる直列４気筒エンジンの鋼管製排気
マニホールドであって、上記集束部中央において上記第
１の排気管および第４の排気管と上記第２の排気管およ
び第３の排気管との管壁部間の溶接ビードが上記第１の
排気管および第２の排気管と上記第４の排気管および第
３の排気管との管壁部間の溶接ビードよりも排気上流側
に位置して重合形成されていることを特徴とする多気筒
エンジンの鋼管製排気マニホールド。3. The pipe lengths of the first and fourth exhaust pipes are second,
The first to fourth four exhaust pipes, which are longer than the pipe length of the third exhaust pipe, are focused on each other at the exhaust downstream end, and the exhaust pipes of the focusing portion are connected to each other between adjacent pipe wall portions. A steel pipe exhaust manifold for an in-line 4-cylinder engine integrated by welding, comprising: the first exhaust pipe, the fourth exhaust pipe, the second exhaust pipe, and the third exhaust gas at the center of the focusing portion. The weld bead between the pipe and the pipe wall is on the exhaust upstream side of the weld bead between the pipe walls of the first exhaust pipe and the second exhaust pipe and the fourth exhaust pipe and the third exhaust pipe. An exhaust manifold made of a steel pipe for a multi-cylinder engine, characterized in that the exhaust manifold is formed at the position of the cylinder.
３本の鋼管製排気管を排気下流側端部で相互に集束させ
るとともに該集束部の各排気管の相互に隣接する管壁部
間を溶接することにより一体化してなる多気筒エンジン
の鋼管製排気マニホールドの製造方法であって、先ず最
初に軸方向への熱伸び量の差が大きい排気管同士の管壁
部間の溶接を行ない、次いで軸方向への熱伸び量の差が
小さい排気管同士の管壁部間の溶接を行うことにより、
上記集束部における各排気管の相互に隣接する管壁部間
を接合するようにしたことを特徴とする多気筒エンジン
の鋼管製排気マニホールドの製造方法。4. At least three steel pipe exhaust pipes having different amounts of thermal expansion in the axial direction are mutually focused at the exhaust downstream end, and the exhaust pipes of the converging portion are adjacent to each other. A method for manufacturing a steel pipe exhaust manifold for a multi-cylinder engine, which is integrated by welding, first of all, welding is performed between pipe wall portions of exhaust pipes having a large difference in thermal expansion in the axial direction. , Next, by welding the pipe wall portions of the exhaust pipes with a small difference in the amount of thermal expansion in the axial direction,
A method for manufacturing a steel pipe exhaust manifold for a multi-cylinder engine, characterized in that pipe walls adjacent to each other of the exhaust pipes in the converging portion are joined to each other.
が小さい排気管同士の管壁部間の溶接は、軸方向への熱
伸び量が大きい排気管同士の管壁部間側から軸方向への
熱伸び量が小さい排気管同士の管壁部間側方向、又はそ
の逆の方向に向けて行うようにしたことを特徴とする請
求項４記載の多気筒エンジンの鋼管製排気マニホールド
の製造方法。5. The subsequent welding between the pipe wall portions of the exhaust pipes having a small difference in the thermal expansion amount in the axial direction is performed between the pipe wall portions of the exhaust pipes having a large thermal expansion amount in the axial direction. 5. The exhaust pipe made of steel pipe for a multi-cylinder engine according to claim 4, characterized in that the heat expansion from the pipe to the axial direction is performed in the direction between the pipe wall portions of the exhaust pipes or in the opposite direction. Manifold manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19339194A JP3455930B2 (en) | 1994-08-17 | 1994-08-17 | Steel pipe exhaust manifold for multi-cylinder engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19339194A JP3455930B2 (en) | 1994-08-17 | 1994-08-17 | Steel pipe exhaust manifold for multi-cylinder engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0861058A true JPH0861058A (en) | 1996-03-05 |
| JP3455930B2 JP3455930B2 (en) | 2003-10-14 |
Family
ID=16307165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19339194A Expired - Fee Related JP3455930B2 (en) | 1994-08-17 | 1994-08-17 | Steel pipe exhaust manifold for multi-cylinder engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3455930B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338331A (en) * | 2020-09-16 | 2021-02-09 | 西部超导材料科技股份有限公司 | Welding method for eliminating titanium and titanium alloy consumable electrode weld cracks |
-
1994
- 1994-08-17 JP JP19339194A patent/JP3455930B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338331A (en) * | 2020-09-16 | 2021-02-09 | 西部超导材料科技股份有限公司 | Welding method for eliminating titanium and titanium alloy consumable electrode weld cracks |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3455930B2 (en) | 2003-10-14 |
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