JP2005214162A - Cooling structure for exhaust manifold - Google Patents

Cooling structure for exhaust manifold Download PDF

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Publication number
JP2005214162A
JP2005214162A JP2004025450A JP2004025450A JP2005214162A JP 2005214162 A JP2005214162 A JP 2005214162A JP 2004025450 A JP2004025450 A JP 2004025450A JP 2004025450 A JP2004025450 A JP 2004025450A JP 2005214162 A JP2005214162 A JP 2005214162A
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water jacket
exhaust manifold
cylinder
cooling structure
exhaust
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JP4382508B2 (en
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Hirotaka Yamamoto
浩貴 山本
Ayako Saito
綾子 齋藤
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure for an exhaust manifold capable of increasing cooling efficiency of a gathering part of air exhaust passages from each cylinder. <P>SOLUTION: In the cooling structure of an exhaust manifold 1 provided on one side wall of a cylinder head of a multi-cylinder engine, an upper part water jacket 4 and a lower part water jacket 5 independently communicating to a water jacket formed in the cylinder head of the engine is provided on the gathering part 3 of the air exhaust passage 2a-2d from each cylinder. The water jacket having sufficient heat exchange capacity can be formed without trouble in manufacturing an exhaust manifold by dividing the water jacket to the upper part and the lower part for increasing cooling efficiency of the gathering part of air exhaust passage which especially gets high temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、多気筒エンジンにおけるシリンダヘッドの一側壁に設けられる排気マニホルドの冷却構造に関するものである。   The present invention relates to an exhaust manifold cooling structure provided on one side wall of a cylinder head in a multi-cylinder engine.

燃焼室からの排出ガスの温度を低減するための方策として、燃焼室からエンジン外へ排出ガスを導出する排気管の周囲に、冷却水が流通するウォータジャケットを形成したものが知られている（例えば特許文献１を参照されたい）。
特開２０００−２５７４２３号公報 As a measure for reducing the temperature of the exhaust gas from the combustion chamber, a water jacket in which cooling water flows is known around the exhaust pipe that leads the exhaust gas out of the engine from the combustion chamber ( For example, see Patent Document 1).
JP 2000-257423 A

しかるに、多気筒エンジンの排気マニホルドにおける各気筒の排気ポートに連結された排気通路の集合部は、複数の気筒からの排出ガスが絶え間なく流過するため、他の部位に比して特に高温になりがちであるが、上記文献に開示された技術は、単気筒の船舶用エンジンを対象にしたものであり、多気筒エンジンの排気マニホルドの冷却効率を高めるのに十分とは言い難い。   However, in the exhaust manifold of a multi-cylinder engine, the exhaust passage connected to the exhaust port of each cylinder continuously flows exhaust gas from a plurality of cylinders. However, the technique disclosed in the above document is intended for a single-cylinder marine engine and is not sufficient to increase the cooling efficiency of the exhaust manifold of a multi-cylinder engine.

このような課題を解決し、各気筒からの排気通路の集合部の冷却効率を高めることのできる排気マニホルドの冷却構造を提供するため、本発明の請求項１は、多気筒エンジンにおけるシリンダヘッドの一側壁に設けられる排気マニホルド（１）の冷却構造を、各気筒からの排気通路（２ａ〜２ｄ）の集合部（３）に、当該エンジンのシリンダヘッドに画成されたウォータジャケットに互いに独立して連通する上部ウォータジャケット（４）及び下部ウォータジャケット（５）を設けることを特徴とするものとした。   In order to solve such a problem and to provide a cooling structure for an exhaust manifold that can improve the cooling efficiency of the collection portion of the exhaust passage from each cylinder, claim 1 of the present invention provides a cylinder head in a multi-cylinder engine. The cooling structure of the exhaust manifold (1) provided on one side wall is independent of the water jacket defined in the cylinder head of the engine in the assembly portion (3) of the exhaust passages (2a to 2d) from each cylinder. The upper water jacket (4) and the lower water jacket (5) communicating with each other are provided.

また本発明の請求項２は、上記構成に加えて、前記上部ウォータジャケットにて前記集合部の上方を覆うものとし、前記下部ウォータジャケットにて前記集合部の下方から各気筒のシリンダヘッドとの連結端近傍の下方までを覆うものとした。   According to a second aspect of the present invention, in addition to the above configuration, the upper water jacket covers the upper portion of the collecting portion, and the lower water jacket covers the cylinder head of each cylinder from below the collecting portion. It was supposed to cover up to the lower part near the connection end.

また本発明の請求項３は、前記ウォータジャケットを、当該排気マニホルドのシリンダ列方向の一方に冷却水入口（９ａ〜９ｄ）を備え、他方に冷却水出口（９ｅ〜９ｇ）を備えるものとした。   According to a third aspect of the present invention, the water jacket is provided with a cooling water inlet (9a to 9d) on one side in the cylinder row direction of the exhaust manifold and a cooling water outlet (9e to 9g) on the other side. .

さらに本発明の請求項４は、前記集合部にボルト孔が設けられ、前記ウォータジャケットは、前記ボルト孔の周囲にも形成されることを特徴とするものとした。   Furthermore, a fourth aspect of the present invention is characterized in that a bolt hole is provided in the collecting portion, and the water jacket is also formed around the bolt hole.

このような本発明の請求項１の構成によれば、特に高温になる排気通路の集合部の冷却効果を高めるためのウォータジャケットを上下に分割することにより、排気マニホルドの製造を困難にせずに十分な熱交換容量を有するウォータジャケットを形成することができる。   According to the configuration of the first aspect of the present invention as described above, the water jacket for enhancing the cooling effect of the collecting portion of the exhaust passage that becomes particularly high temperature is divided into upper and lower parts without making it difficult to manufacture the exhaust manifold. A water jacket having a sufficient heat exchange capacity can be formed.

また請求項２の構成によれば、デッドスペースとなる排気マニホルドの下方にウオータジャケットの大部分が形成されるので、排気マニホルドを大型化せずに熱交換部位を広く形成することができ、しかも最も高温になる燃焼室に近接する部位の冷却水流量を増加させることができる。   According to the second aspect of the present invention, most of the water jacket is formed below the exhaust manifold, which becomes a dead space, so that the heat exchanging portion can be widely formed without increasing the size of the exhaust manifold. It is possible to increase the flow rate of the cooling water in the portion adjacent to the combustion chamber that is the hottest.

また請求項３の構成によれば、排気マニホルドに形成したウォータジャケット内に淀みなく冷却水を流過させることができるので、排気通路の集合部の冷却効率を高めることができる。   According to the third aspect of the present invention, the cooling water can be allowed to flow without any stagnation in the water jacket formed in the exhaust manifold, so that the cooling efficiency of the collecting portion of the exhaust passage can be increased.

そして請求項４の構成によれば、排気通路の集合部に例えば触媒コンバータなどをフランジ接続するために設けられたボルト孔の周囲にもウォータジャケットが形成されるので、ボルトの昇温を抑制して熱負荷によるボルトの緩みを防止することができる。   According to the fourth aspect of the present invention, since the water jacket is also formed around the bolt hole provided for flange-connecting, for example, a catalytic converter or the like to the collecting portion of the exhaust passage, the temperature rise of the bolt is suppressed. Thus, the bolt can be prevented from loosening due to heat load.

以下に添付の図面を参照して本発明について詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

図１並びに図２は、本発明に基づき構成された排気マニホルドの概要を示しており、図１は上方から見た図であり、図２は下方から見た図である。この排気マニホルド１は、直列４気筒エンジンのシリンダヘッドの側面に開口した排気ポート（図示せず）に個々に連結される４つの排気通路２ａ〜２ｄを１つに集合してなるものであり、その４つの排気通路２ａ〜２ｄの集合部３の上面のみを覆う上部ウォータジャケット４と、多岐通路の下面の略全体を覆うと共に、各排気通路２ａ〜２ｄの上方の一部並びに排気通路集合部３の下方および左右両側方を覆う下部ウォータジャケット５とを備えている。なお、これらの排気通路２ａ〜２ｄ、集合部３、上部ウォータジャケット４および下部ウォータジャケット５は、共に鋳物内の空間として形成されるものであり、図１並びに図２はこの空間のみを示している。   1 and 2 show an outline of an exhaust manifold constructed according to the present invention. FIG. 1 is a view from above, and FIG. 2 is a view from below. The exhaust manifold 1 is formed by assembling four exhaust passages 2a to 2d that are individually connected to an exhaust port (not shown) opened on a side surface of a cylinder head of an in-line four-cylinder engine. The upper water jacket 4 that covers only the upper surface of the collective portion 3 of the four exhaust passages 2a to 2d, the substantially entire lower surface of the manifold passage, and a part above the exhaust passages 2a to 2d and the exhaust passage collective portion 3 and a lower water jacket 5 covering both the left and right sides. The exhaust passages 2a to 2d, the collecting portion 3, the upper water jacket 4 and the lower water jacket 5 are all formed as spaces in the casting, and FIGS. 1 and 2 show only this space. Yes.

このように、上下２分割のウォータジャケット構成を採ることにより、製造の困難化を招かずに十分な熱交換容量を有するウォータジャケット４・５を排気マニホルド１に一体成型することができる。   In this way, by adopting a water jacket configuration that is divided into two parts, the water jackets 4 and 5 having a sufficient heat exchange capacity can be integrally formed in the exhaust manifold 1 without causing difficulty in manufacturing.

上部ウォータジャケット４は、シリンダヘッド内に画成されたウォータジャケットを流れる冷却水を、シリンダヘッドとの接合面に設けられた取水口６から取り込み、排気通路集合部３の最下流側（例えば触媒コンバータとの接続口）近傍に設けた排水口７からシリンダブロックの冷却水出口通路にゴムホース等で連結されてラジエタに戻される。このようにして、圧力差が十分な２つの部位に冷却水の入口６並びに出口７を繋ぐことにより、流路が比較的短い上部ウォータジャケット４を淀みなく冷却水が流過するようにしている。また、排気通路集合部３の端末には、図示しない触媒コンバータなどをフランジ接続するためのボルト孔が設けられるが、上部ウォータジャケット４のボルト孔に対応する部分には凹部１１ａ・１１ｂが形成されており、これにより、ウォータジャケットの一部がボルト孔の周囲にも形成されている。   The upper water jacket 4 takes in cooling water flowing through the water jacket defined in the cylinder head from a water intake 6 provided on the joint surface with the cylinder head, and is located on the most downstream side (for example, a catalyst) The drainage port 7 provided in the vicinity of the converter connection port) is connected to the cooling water outlet passage of the cylinder block by a rubber hose or the like and returned to the radiator. In this way, the cooling water inlet 6 and the outlet 7 are connected to two parts having a sufficient pressure difference, so that the cooling water flows without squeezing the upper water jacket 4 having a relatively short flow path. . In addition, a bolt hole for flange-connecting a catalytic converter (not shown) is provided at the end of the exhaust passage collecting portion 3, but concave portions 11a and 11b are formed in portions corresponding to the bolt holes of the upper water jacket 4. Thus, a part of the water jacket is also formed around the bolt hole.

下部ウォータジャケット５は、各排気通路２ａ〜２ｄの各上方の一部を覆うための延出部８ａ〜８ｄの端部と、各排気通路２ａ〜２ｄ同士間の各下方との合計７ヶ所に設けられた連通口９ａ〜９ｇを介してシリンダヘッド内に画成されたウォータジャケットと連通している。そして、シリンダ列方向の中間より一側の連通口９ａ〜９ｄを取水口として冷却水が流入し、他側の連通口９ｅ〜９ｇを排水口として冷却水が流出するようにしてある。これにより、シリンダヘッドのウォータジャケット内の圧力差を利用して下部ウォータジャケット５内を冷却水が流れるようにしてあるので、流路が比較的長い下部ウォータジャケット５内を淀みなく冷却水が流過するため、下部ウォータジャケット５から延出したコ字形をなす部分１０で排気通路集合部３の周囲を取り囲んだことと相俟って、排気マニホルド１全体の冷却効率を高めることができる。また排気マニホルド１は、シリンダヘッドから下向きに湾曲して延出され、エンジン本体の側面と概ね対向する下方はデッドスペースとなるので、容積の比較的大きなウォータジャケットを設けても、エンジン本体の大型化には繋がらずに済む。   The lower water jacket 5 has a total of seven locations, that is, end portions of the extending portions 8a to 8d for covering a part of the upper portions of the exhaust passages 2a to 2d and the lower portions of the exhaust passages 2a to 2d. It communicates with a water jacket defined in the cylinder head through the provided communication ports 9a to 9g. Then, the cooling water flows in with the communication ports 9a to 9d on one side from the middle in the cylinder row direction as the water outlet, and the cooling water flows out with the communication ports 9e to 9g on the other side as the drain ports. As a result, the cooling water flows through the lower water jacket 5 using the pressure difference in the water jacket of the cylinder head, so that the cooling water flows without stagnation in the lower water jacket 5 having a relatively long flow path. Therefore, the cooling efficiency of the exhaust manifold 1 as a whole can be increased in combination with the fact that the portion 10 having a U-shape extending from the lower water jacket 5 surrounds the exhaust passage assembly 3. Further, the exhaust manifold 1 is curved and extended downward from the cylinder head, and a lower portion that is substantially opposite to the side surface of the engine body is a dead space. It does not lead to the transformation.

図示しない触媒コンバータなどをフランジ接続するために排気通路集合部３の端末に設けられるボルト孔は、下部ウォータジャケット５のコ字形をなす部分１０の側にも設けられるが、コ字形をなす部分１０におけるボルト孔に対応する部分にも、ウォータジャケットの一部をボルト孔の周囲に画成すべく凹部１２ａ・１２ｂが形成されている。   A bolt hole provided at the end of the exhaust passage assembly 3 to flange-connect a catalytic converter or the like (not shown) is also provided on the side 10 of the lower water jacket 5, but the U-shaped portion 10. Recesses 12a and 12b are also formed at portions corresponding to the bolt holes in order to define a part of the water jacket around the bolt holes.

このようにして、排気通路の周囲に冷却水を流すことにより、燃焼室周囲の冷却水流量が増大するため、最も高温になる燃焼室の温度、つまり燃焼温度を下げてノッキングを防ぐことができるので、点火時期を進角させて出力をより一層高めることができる。   In this way, the flow of the cooling water around the exhaust passage increases the flow rate of the cooling water around the combustion chamber, so that the temperature of the combustion chamber that is the highest temperature, that is, the combustion temperature can be lowered to prevent knocking. Therefore, the ignition timing can be advanced to further increase the output.

また、排気マニホルド１の排気通路集合部３に触媒コンバータなどをフランジ接続するために設けられたボルト孔の周囲にもウォータジャケット形成されているので、ボルトの昇温を抑制して熱負荷によるボルトの緩みを防止することができる。   Further, a water jacket is also formed around a bolt hole provided for flange-connecting a catalytic converter or the like to the exhaust passage collecting portion 3 of the exhaust manifold 1, so that the temperature rise of the bolt is suppressed and a bolt caused by a thermal load is suppressed. Can be prevented.

以上詳述した通り、本発明によれば、排気マニホルドの製造を困難にせず、しかも排気マニホルドを大型化せずに、十分な熱交換容量を有するウォータジャケットを形成することができる上、最も高温になる燃焼室近傍並びに排気通路集合部の冷却効率を高めることができる。   As described above in detail, according to the present invention, a water jacket having a sufficient heat exchange capacity can be formed without making the manufacture of the exhaust manifold difficult and without increasing the size of the exhaust manifold, and at the highest temperature. Thus, the cooling efficiency in the vicinity of the combustion chamber and in the exhaust passage assembly can be increased.

本発明による排気マニホルドとウォータジャケットとの関係を示す上方からの斜視図である。It is a perspective view from the top which shows the relationship between the exhaust manifold by this invention, and a water jacket. 本発明による排気マニホルドとウォータジャケットとの関係を示す下方からの斜視図である。It is a perspective view from the lower part which shows the relationship between the exhaust manifold by this invention, and a water jacket.

符号の説明Explanation of symbols

１ 排気マニホルド
２ａ〜２ｄ 排気通路
３ 集合部
４ 上部ウォータジャケット
５ 下部ウォータジャケット
９ａ〜９ｄ 冷却水入口
９ｅ〜９ｇ 冷却水出口
１１ａ・１１ｂ・１２ａ・１２ｂ 凹部 DESCRIPTION OF SYMBOLS 1 Exhaust manifold 2a-2d Exhaust passage 3 Collecting part 4 Upper water jacket 5 Lower water jacket 9a-9d Cooling water inlet 9e-9g Cooling water outlet 11a * 11b * 12a * 12b Recessed part

Claims (4)

多気筒エンジンにおけるシリンダヘッドの一側壁に設けられる排気マニホルドの冷却構造であって、
各気筒からの排気通路の集合部に、当該エンジンのシリンダヘッドに画成されたウォータジャケットに互いに独立して連通する上部ウォータジャケット及び下部ウォータジャケットを設けることを特徴とする排気マニホルドの冷却構造。 An exhaust manifold cooling structure provided on one side wall of a cylinder head in a multi-cylinder engine,
An exhaust manifold cooling structure, characterized in that an upper water jacket and a lower water jacket, which communicate with each other independently from a water jacket defined in a cylinder head of the engine, are provided at a collection portion of exhaust passages from each cylinder. 前記上部ウォータジャケットは、前記集合部の上方を覆うものであり、前記下部ウォータジャケットは、前記集合部の下方から各気筒のシリンダヘッドとの連結端近傍の下方までを覆うものであることを特徴とする請求項１に記載の排気マニホルドの冷却構造。   The upper water jacket covers the upper part of the collecting part, and the lower water jacket covers the lower part of the collecting part to the lower part near the connection end with the cylinder head of each cylinder. The exhaust manifold cooling structure according to claim 1. 前記ウォータジャケットは、当該排気マニホルドのシリンダ列方向の一方に冷却水入口を備え、他方に冷却水出口を備えるものであることを特徴とする請求項１若しくは２に記載の排気マニホルドの冷却構造。   3. The exhaust manifold cooling structure according to claim 1, wherein the water jacket includes a cooling water inlet on one side in a cylinder row direction of the exhaust manifold and a cooling water outlet on the other side. 4. 前記集合部にボルト孔が設けられ、前記ウォータジャケットは、前記ボルト孔の周囲にも形成されることを特徴とする請求項１乃至３のいずれかに記載の排気マニホルドの冷却構造。   The exhaust manifold cooling structure according to any one of claims 1 to 3, wherein a bolt hole is provided in the gathering portion, and the water jacket is also formed around the bolt hole.
JP2004025450A 2004-02-02 2004-02-02 Exhaust manifold cooling structure Expired - Fee Related JP4382508B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009002166A (en) * 2007-06-19 2009-01-08 Honda Motor Co Ltd Cooling system for exhaust manifold
JP2009228533A (en) * 2008-03-21 2009-10-08 Mazda Motor Corp Exhaust manifold
JP2014084739A (en) * 2012-10-19 2014-05-12 Honda Motor Co Ltd Water jacket structure of cylinder head

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101198790B1 (en) 2010-09-29 2012-11-07 현대자동차주식회사 Engine that water jacket is formed

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009002166A (en) * 2007-06-19 2009-01-08 Honda Motor Co Ltd Cooling system for exhaust manifold
JP4575934B2 (en) * 2007-06-19 2010-11-04 本田技研工業株式会社 Exhaust manifold cooling system
JP2009228533A (en) * 2008-03-21 2009-10-08 Mazda Motor Corp Exhaust manifold
JP2014084739A (en) * 2012-10-19 2014-05-12 Honda Motor Co Ltd Water jacket structure of cylinder head

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