JP2509161Y2 - Exhaust manifold - Google Patents
Exhaust manifoldInfo
- Publication number
- JP2509161Y2 JP2509161Y2 JP1989098469U JP9846989U JP2509161Y2 JP 2509161 Y2 JP2509161 Y2 JP 2509161Y2 JP 1989098469 U JP1989098469 U JP 1989098469U JP 9846989 U JP9846989 U JP 9846989U JP 2509161 Y2 JP2509161 Y2 JP 2509161Y2
- Authority
- JP
- Japan
- Prior art keywords
- group
- branch pipes
- branch
- branch pipe
- exhaust manifold
- 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.)
- Expired - Fee Related
Links
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は、４気筒エンジン用の鋳物製の排気マニホル
ドに関する。DETAILED DESCRIPTION OF THE INVENTION Industrial Field The present invention relates to a cast exhaust manifold for a four cylinder engine.
（従来の技術） 従来、４気筒エンジン用の排気マニホルドでは、排気
干渉を避けるため分岐管を＃１、＃４気筒に連なる第１
のグループと、＃２、＃３気筒に連なる第２のグループ
との２つのグループに組分けし、共通の出口フランジに
各グループ毎に分岐管を合流して接合するようにしてお
り、該フランジに各グループの合流部を気筒列方向に並
設して結合する場合、第１のグループの一方の分岐管が
第２のグループの分岐管に交差するように配設され、こ
の場合従来は、実開昭61−190423号公報に見られるよう
に、これら分岐管を交差箇所において外壁を共用するよ
うに重合させている。(Prior Art) Conventionally, in an exhaust manifold for a four-cylinder engine, in order to avoid exhaust interference, the first branch pipe is connected to the # 1 and # 4 cylinders.
Group and a second group connected to the # 2 and # 3 cylinders, and the branch pipes of each group are joined and joined to a common outlet flange. When the merging portions of the respective groups are arranged side by side in the cylinder row direction and are coupled to each other, one branch pipe of the first group is disposed so as to intersect the branch pipe of the second group. In this case, conventionally, As seen in Japanese Utility Model Laid-Open No. Sho 61-190423, these branch pipes are polymerized so as to share the outer wall at the intersection.
（考案が解決しようとする課題） 上記の如く分岐管を交差箇所で重合させると、交差す
る一方の分岐管と他方の分岐管の熱変形方向の差異に起
因して、重合部に集中応力が作用するようになり、補強
のため重合部の周囲に駄肉を付けざるを得なくなって、
排気マニホルドの重量が増し、更に重量増に起因して排
気マニホルドの熱容量が増すため、始動後暫くは排気ガ
スの熱が排気マニホルドに奪われて排気温が上昇しなく
なり、排気浄化性能が悪くなる。(Problems to be solved by the invention) When the branch pipes are superposed at the intersections as described above, due to the difference in the thermal deformation direction between the one branch pipe and the other branch pipe intersecting, a concentrated stress is generated in the superposed portion. It started to work, and there was no choice but to put extra meat around the overlapping part for reinforcement,
Since the weight of the exhaust manifold increases and the heat capacity of the exhaust manifold increases due to the increase in weight, the heat of the exhaust gas is taken away by the exhaust manifold for a while after starting, the exhaust temperature does not rise, and the exhaust purification performance deteriorates. .
本考案は、かかる不具合を解決すべく、駄肉を不要と
して軽量化を図れるようにした排気マニホルドを提供す
ることをその目的としている。An object of the present invention is to provide an exhaust manifold which can reduce the weight by eliminating the useless meat in order to solve such a problem.
（課題を解決するための手段） 上記目的を達成すべく、本考案は、４気筒エンジン用
の鋳物製の排気マニホルドであって、エンジンの排気ポ
ートに接合される共通の入口フランジに結合される４本
の分岐管を備え、これら分岐管を、気筒列方向両外側の
２個の気筒に連通する２本の分岐管から成る第１グルー
プと、気筒列方向内側の２個の気筒に連通する２本の分
岐管から成る第２グループとにグループ分けし、第１グ
ループの一方の分岐管を第２グループの両分岐管に交差
するように配置して、各グループ毎に分岐管を合流し、
第１グループの分岐管の合流部と第２グループの分岐管
の合流部とを共通の出口フランジに結合するものにおい
て、エンジン本体から離間する方向を外方、接近する方
向を内方として、第１グループの一方の分岐管を第２グ
ループの両分岐管に対し該両分岐管の内方に空隙を存し
て交差させると共に、交差部において第１グループの一
方の分岐管を内方と、第２グループの両分岐管を外方と
に湾曲させ、且つ、第２グループの両分岐管の湾曲度合
を第１グループの一方の分岐管の湾曲度合よりも大きく
したことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention is a cast exhaust manifold for a four-cylinder engine, which is connected to a common inlet flange joined to an exhaust port of the engine. Four branch pipes are provided, and these branch pipes are connected to a first group of two branch pipes that communicate with two cylinders on both outer sides in the cylinder row direction and two cylinders on the inner side in the cylinder row direction. It is divided into a second group consisting of two branch pipes, one branch pipe of the first group is arranged so as to intersect both branch pipes of the second group, and the branch pipes are joined to each group. ,
In a case where the merging portion of the branch pipes of the first group and the merging portion of the branch pipes of the second group are coupled to a common outlet flange, the direction away from the engine body is the outer side, and the approaching direction is the inner side. One branch pipe of one group is intersected with both branch pipes of the second group with a gap inside the both branch pipes, and one branch pipe of the first group is inward at the intersection. It is characterized in that both branch pipes of the second group are curved outward and the degree of curvature of both branch pipes of the second group is made larger than the degree of curvature of one branch pipe of the first group.
（作用） 交差する一方と他方の分岐管が重合していないため、
従来技術の如く重合部での応力は発生せず、強度アップ
のための余分な肉付けが不要となり、排気マニホルドの
軽量化を図れる。(Function) Since the branch pipes of one side and the other side that intersect are not polymerized,
As in the prior art, no stress is generated in the overlapping portion, extra flesh is not required to increase the strength, and the exhaust manifold can be made lightweight.
また、交差部において第１グループの分岐管と第２グ
ループの分岐管とが互に反対方向に湾曲しているため、
両グループの分岐管は熱応力で互に離間する方向に変形
し、交差部の空隙を左程広く確保しなくても、これら分
岐管の熱変形による接触を防止でき、排気マニホルドを
コンパクトに構成できる。Further, since the branch pipes of the first group and the branch pipes of the second group are curved in opposite directions at the intersection,
The branch pipes of both groups are deformed by thermal stress in the direction of separating from each other, and even if the space at the intersection is not widened to the left, contact due to thermal deformation of these branch pipes can be prevented, and the exhaust manifold is made compact. it can.
ところで、各分岐管はその上流端及び下流端において
共通の入口フランジ及び出口フランジを介して相互に拘
束されるため、各分岐管の熱膨張差による応力がフラン
ジや分岐管に作用し、この場合、各分岐管の湾曲度合が
同一であると、何れの分岐管に応力が集中するか特定す
ることが困難になるため、広範囲に補強用の肉付けをす
る必要がある。然し、本考案では、交差する分岐管の一
方の湾曲度合を他方よりも大きくしているため、湾曲度
合の大きな分岐管の方が変形し易くなって、その変形に
より各分岐管の熱膨張差が優先的に吸収されることにな
り、応力集中箇所の特定が容易になって、無駄な肉付け
をせずに済み、排気マニホルドの一層の軽量化を図れ
る。By the way, since each branch pipe is mutually restrained at its upstream end and downstream end via a common inlet flange and outlet flange, the stress due to the thermal expansion difference of each branch pipe acts on the flange and the branch pipe. When the degree of curvature of each branch pipe is the same, it is difficult to specify in which branch pipe the stress concentrates. Therefore, it is necessary to add reinforcement for a wide area. However, in the present invention, since the degree of bending of one of the intersecting branch pipes is larger than that of the other branch pipe, the branch pipe having a large bending degree is more likely to be deformed, and the deformation causes a difference in thermal expansion between the branch pipes. Are preferentially absorbed, the location of stress concentration can be easily identified, useless fleshing can be avoided, and the exhaust manifold can be further reduced in weight.
また、スペース的に有利な外方位置に第２グループの
分岐管を配置して、該分岐管の湾曲度合を大きくするこ
とにより各分岐管の等長化も図れるようにし、且つ、内
方に配置する第１グループの分岐管の湾曲度合を小さく
して、エンジン本体に対する熱影響を抑制できるように
しており、合理的なレイアウトになっている。Further, by arranging the branch pipes of the second group at the outer position, which is advantageous in terms of space, and increasing the degree of bending of the branch pipes, the lengths of the respective branch pipes can be made equal, and inward The degree of curvature of the branch pipes of the first group to be arranged is reduced to suppress the thermal influence on the engine body, and the layout is rational.
（実施例） 第１図は点火順序を＃１→＃３→＃４→＃２とする４
気筒エンジン用の排気マニホルドを示し、（１）はエン
ジンのシリンダヘッドに接合する入口フランジ、（２）
は排気管を接続する出口フランジであり、＃１乃至＃４
気筒に各連通する第１乃至第４の４本の分岐管（31）
（32）（33）（34）を、第１、第４分岐管（31）（34）
から成る第１グループと第２、第３分岐管（32）（33）
から成る第２グループとの２つのグループに分け、各グ
ループ毎に分岐管を合流して、第１、第４分岐管（31）
（34）の合流部（41）と第２、第３分岐管（32）（33）
の合流部（42）とを気筒列方向に並設して出口フランジ
（２）に結合し、第４分岐管（34）を第２、第３分岐管
（32）（33）に交差させて合流部（41）に導くようにし
た。尚、隣接する分岐管間及び合流部（41）（42）間は
空隙（５）とし、軽量化を図るようにした。(Embodiment) In FIG. 1, the ignition order is # 1 → # 3 → # 4 → # 2 4
Shows an exhaust manifold for a cylinder engine, (1) is an inlet flange that joins to the cylinder head of the engine, (2)
Is an outlet flange for connecting the exhaust pipe, and is # 1 to # 4.
First to fourth branch pipes (3 1 ) each communicating with the cylinder
(3 2 ) (3 3 ) (3 4 ) to the 1st and 4th branch pipes (3 1 ) (3 4 )
1st group consisting of 2nd and 3rd branch pipes (3 2 ) (3 3 )
It is divided into two groups, a second group consisting of 1 and a branch pipe for each group, and the first and fourth branch pipes (3 1 )
Confluence part (4 1 ) of (3 4 ) and second and third branch pipes (3 2 ) (3 3 )
And the merging portion (4 2 ) of the second branch pipe (3 4 ) are arranged side by side in the cylinder row direction and connected to the outlet flange (2), and the fourth branch pipe (3 4 ) is connected to the second and third branch pipes (3 2 ) (3 3 ) It was made to intersect with and lead to the confluence (4 1 ). A space (5) was provided between the adjacent branch pipes and between the merging portions (4 1 ) (4 2 ) to reduce the weight.
各分岐管は同じグループに属する分岐管に気筒列方向
から見て重なり合うように配設されており、第１グルー
プの気筒列方向の配設面ａに対し第２グループの気筒列
方向の配設面ｂを第２図に示す如く外方に離間させて、
第４分岐管（34）が第３図に示す如く第２、第３分岐管
（32）（33）の内方を空隙（６）を存して交差するよう
にし、更に前記両配設面ａ、ｂの中間部が互に遠ざかる
ように、第２、第３分岐管（32）（33）を外方に湾曲さ
せると共に第４分岐管（34）を内方に湾曲させて、各分
岐管が熱膨張により前記両フランジ（１）（２）間で湾
曲するように変形しても、第４分岐管（34）と第２、第
３分岐管（32）（33）とが接触しないようにし、熱変形
に対してのより大きな許容度を持てるようにした。The branch pipes are arranged so as to overlap the branch pipes belonging to the same group when viewed from the cylinder row direction, and are arranged in the cylinder row direction of the second group with respect to the arrangement surface a in the cylinder row direction of the first group. The surface b is separated outward as shown in FIG.
As shown in FIG. 3, the fourth branch pipe (3 4 ) intersects the insides of the second and third branch pipes (3 2 ) (3 3 ) with a gap (6), and further The second and third branch pipes (3 2 ) (3 3 ) are curved outward and the fourth branch pipe (3 4 ) is oriented inward so that the intermediate portions of the mounting surfaces a and b are separated from each other. Even if the branch pipes are bent and deformed so as to be bent between the flanges (1) and (2) due to thermal expansion, the fourth branch pipe (3 4 ) and the second and third branch pipes (3 2) ) (3 3) and is prevented from contacting and (s) to have a greater tolerance to heat deformation.
尚、前記両合流部（41）（42）を結合する出口フラン
ジ（２）に作用する応力は、両合流部（41）（42）の夫
々の変形方向が近似しているため左程大きくならず、特
別な補強を行わなくとも実用上問題はない。Note that the two merging portion (4 1) (4 2) stresses acting on the outlet flange (2) that binds the two merging portion (4 1) (4 2) the deformation direction of each is similar in It is not as large as on the left, and there is no problem in practice without special reinforcement.
また、第２、第３分岐管（32）（33）の湾曲度合を第
４分岐管（34）の湾曲度合よりも大きくし、第２、第３
分岐管（32）（33）の管長を長くして、各分岐管の等長
化を図れるようにしている。In addition, the degree of bending of the second and third branch pipes (3 2 ) (3 3 ) is made larger than the degree of bending of the fourth branch pipe (3 4 ).
The branch pipes (3 2 ) (3 3 ) are lengthened so that each branch pipe can be made equal in length.
（考案の効果） 以上の説明から明らかなように、本考案によれば、排
気マニホルドの軽量化を図れると共に、軽量化による排
気マニホルドの熱容量の低減により、始動直後の排気温
上昇が促進され、排気浄化性能を向上でき、更に、各分
岐管の等長化が可能となり、各気筒の出力性能を均等化
して音や振動を抑制できる。(Effects of the Invention) As is clear from the above description, according to the present invention, the exhaust manifold can be made lighter, and the heat capacity of the exhaust manifold is reduced by the weight reduction, so that the exhaust temperature rise immediately after the start is promoted. The exhaust gas purification performance can be improved, the branch pipes can be made equal in length, and the output performance of each cylinder can be equalized to suppress noise and vibration.
第１図は本案排気マニホルドの１例の正面図、第２図は
その側面図、第３図は第２図のIII−III線截断面図であ
る。 （１）…入口フランジ、（２）…出口フランジ （31）〜（34）…分岐管、（41）（42）…合流部 （６）…空隙FIG. 1 is a front view of an example of the exhaust manifold of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along the line III-III of FIG. (1) ... Inlet flange, (2) ... Outlet flange (3 1 ) to (3 4 ) ... Branching pipe, (4 1 ) (4 2 ) ... Merging part (6) ... Void
───────────────────────────────────────────────────── フロントページの続き (72)考案者 前田 文彦 埼玉県和光市中央１丁目４番１号 株式 会社本田技術研究所内 (56)参考文献 実開 昭59−99118（ＪＰ，Ｕ) 実開 平１−66424（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumihiko Maeda 1-4-1 Chuo, Wako-shi, Saitama Honda R & D Co., Ltd. (56) Bibliography Sho 59-99118 (JP, U) 1-66424 (JP, U)
Claims (1)
ドであって、エンジンの排気ポートに接合される共通の
入口フランジに結合される４本の分岐管を備え、これら
分岐管を、気筒列方向両外側の２個の気筒に連通する２
本の分岐管から成る第１グループと、気筒列方向内側の
２個の気筒に連通する２本の分岐管から成る第２グルー
プとにグループ分けし、第１グループの一方の分岐管を
第２グループの両分岐管に交差するように配置して、各
グループ毎に分岐管を合流し、第１グループの分岐管の
合流部と第２グループの分岐管の合流部とを共通の出口
フランジに結合するものにおいて、エンジン本体から離
間する方向を外方、接近する方向を内方として、第１グ
ループの一方の分岐管を第２グループの両分岐管に対し
該両分岐管の内方に空隙を存して交差させると共に、交
差部において第１グループの一方の分岐管を内方と、第
２グループの両分岐管を外方とに湾曲させ、且つ、第２
グループの両分岐管の湾曲度合を第１グループの一方の
分岐管の湾曲度合よりも大きくしたことを特徴とする排
気マニホルド。1. An exhaust manifold made of casting for a four-cylinder engine, comprising four branch pipes connected to a common inlet flange joined to an exhaust port of the engine. 2 communicating with two cylinders on both sides in the direction
Grouped into a first group consisting of two branch pipes and a second group consisting of two branch pipes communicating with two cylinders inward in the cylinder row direction, and one branch pipe of the first group is divided into a second group. The branch pipes are arranged so as to intersect with both branch pipes of the group, and the branch pipes of each group are joined together, and the joining portion of the branch pipes of the first group and the joining portion of the branch pipes of the second group are connected to a common outlet flange. In the connection, one branch pipe of the first group is spaced from the engine body outward and the approaching direction is inward with respect to both branch pipes of the second group, and a gap is formed inside the both branch pipes. At the intersection, one branch pipe of the first group is curved inward and both branch pipes of the second group are curved outward at the intersection, and
An exhaust manifold, wherein the degree of curvature of both branch pipes of the group is larger than the degree of curvature of one branch pipe of the first group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989098469U JP2509161Y2 (en) | 1989-08-25 | 1989-08-25 | Exhaust manifold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989098469U JP2509161Y2 (en) | 1989-08-25 | 1989-08-25 | Exhaust manifold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0337230U JPH0337230U (en) | 1991-04-11 |
| JP2509161Y2 true JP2509161Y2 (en) | 1996-08-28 |
Family
ID=31647567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989098469U Expired - Fee Related JP2509161Y2 (en) | 1989-08-25 | 1989-08-25 | Exhaust manifold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2509161Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5999118U (en) * | 1982-12-23 | 1984-07-04 | 日産自動車株式会社 | Internal combustion engine exhaust manifold |
| JPH0166424U (en) * | 1987-10-22 | 1989-04-27 |
-
1989
- 1989-08-25 JP JP1989098469U patent/JP2509161Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0337230U (en) | 1991-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |