JP2007309188A - Cylinder head for internal combustion engine - Google Patents

Cylinder head for internal combustion engine Download PDF

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JP2007309188A
JP2007309188A JP2006138473A JP2006138473A JP2007309188A JP 2007309188 A JP2007309188 A JP 2007309188A JP 2006138473 A JP2006138473 A JP 2006138473A JP 2006138473 A JP2006138473 A JP 2006138473A JP 2007309188 A JP2007309188 A JP 2007309188A
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exhaust
cylinder
cylinder head
interfere
internal combustion
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JP4760526B2 (en
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Takashi Ogino
崇 荻野
Norifumi Mizushima
教文 水嶋
智則 ▲高▼場
Tomonori Takaba
Masahiro Nakajima
正博 中島
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder head structure capable of inhibiting exhaust gas interference with keeping compactness. <P>SOLUTION: Exhaust ports 3 of #2 cylinder and #3 cylinder of which exhaust gas does not easily interfere are merged at an upper part of a cylinder head 1 and exhaust ports 3 of #1 cylinder and #4 cylinder of which exhaust gas does not easily interfere are merged at a lower part of the cylinder head 1. The merge parts 3A, 3B (exhaust ports of which exhaust gas easily interfere) is separated by a bulkhead 11 to separate exhaust gas flow to an exhaust gas outlet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、複数の燃焼室から延びる排気ポートの合流部から排気出口まで一体形成した内燃機関のシリンダヘッドに関する。   The present invention relates to a cylinder head of an internal combustion engine that is integrally formed from a merging portion of exhaust ports extending from a plurality of combustion chambers to an exhaust outlet.

特許文献１に記載された内燃機関のシリンダヘッドでは、複数の燃焼室から延びる排気ポートの合流部から排気出口まで一体形成することにより機関のコンパクト化を図っている。
特許３６０５５２１号 In the cylinder head of the internal combustion engine described in Patent Document 1, the engine is made compact by integrally forming from a confluence portion of exhaust ports extending from a plurality of combustion chambers to an exhaust outlet.
Japanese Patent No. 3605521

特許文献１のシリンダヘッドを、直列４気筒、Ｖ型８気筒など、排気干渉しやすい（各気筒の爆発間隔が短い）機関のシリンダヘッドに適用し、複数の排気ポートをシリンダヘッド内部で合流させる構造とした場合、他の気筒からの排気干渉が発生し、排気がシリンダ内に残ガスとして停留し、機関の発生トルクの低下や燃焼室温度上昇によるノッキングが発生する。   The cylinder head of Patent Document 1 is applied to a cylinder head of an engine such as an in-line 4-cylinder, V-type 8-cylinder, etc., which easily causes exhaust interference (the explosion interval of each cylinder is short), and a plurality of exhaust ports are joined inside the cylinder head In the case of the structure, exhaust interference from other cylinders occurs, the exhaust gas remains as residual gas in the cylinders, and knocking occurs due to a decrease in the generated torque of the engine and an increase in the combustion chamber temperature.

本発明は、このような従来の課題に着目してなされたもので、コンパクト性を維持しつつ排気干渉を抑制できるようにしたシリンダヘッド構造を提供することを目的とする。   The present invention has been made paying attention to such conventional problems, and an object of the present invention is to provide a cylinder head structure capable of suppressing exhaust interference while maintaining compactness.

このため、本発明は、
複数の燃焼室から延びる排気ポートを集合させた排気集合部を一体形成した内燃機関のシリンダヘッドにおいて、
前記排気集合部で、排気干渉しにくい排気ポート同士を合流させつつ、排気干渉しやすい排気ポート同士の排気流を分離する構造としたことを特徴とする。 For this reason, the present invention
In a cylinder head of an internal combustion engine integrally forming an exhaust collecting portion in which exhaust ports extending from a plurality of combustion chambers are gathered,
The exhaust collecting portion is configured to separate exhaust flows between exhaust ports that are likely to interfere with exhaust gas while joining exhaust ports that are less likely to interfere with exhaust gas.

本発明によれば、排気集合部で、排気干渉しにくい排気ポート同士を合流させてコンパクト性を維持しつつ、排気干渉しやすい排気ポート同士の排気流を分離する構造としたことにより、排気干渉の発生を抑制することができる。   According to the present invention, the exhaust gathering portion joins the exhaust ports that are difficult to interfere with the exhaust to maintain the compactness, and the exhaust flow between the exhaust ports that are likely to interfere with the exhaust is separated. Can be suppressed.

以下に本発明の実施の形態を図面に基づいて説明する。
図１は、本発明を点火順序が＃１→＃３→＃４→＃２である直列４気筒内燃機関に適用した第１の実施形態の構成を示す。
本内燃機関のシリンダヘッド１は、＃１〜＃４気筒の各シリンダ頂部２からそれぞれ２つの排気弁（図示せず）によって開閉される２本に分岐した排気ポート３、同じく２つの吸気弁（図示せず）によって開閉される２本に分岐した吸気ポート４が形成されている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a configuration of a first embodiment in which the present invention is applied to an in-line four-cylinder internal combustion engine whose ignition order is # 1 → # 3 → # 4 → # 2.
The cylinder head 1 of the present internal combustion engine includes an exhaust port 3 branched into two opened and closed by two exhaust valves (not shown) from each cylinder top portion 2 of cylinders # 1 to # 4, and two intake valves ( An intake port 4 branched into two is opened and closed by a not-shown).

吸気ポート４は、気筒毎に分離してシリンダヘッド側面に吸気入口が開口され、吸入空気は、シリンダヘッド１に接続される吸気マニホールド（図示せず）のブランチ部で分岐された後、各気筒の吸気入口からシリンダヘッド1内に導入される。
これに対し、排気ポート３については、本発明の対象とするシリンダヘッドでは、全ての排気ポート３をシリンダ配列方向中央部に集合させた排気集合部が、シリンダヘッド１に一体形成されている。そして、前記排気集合部が以下のような本発明に係る構造に形成されている。 The intake port 4 is separated for each cylinder, an intake inlet is opened on the side of the cylinder head, and the intake air is branched at a branch portion of an intake manifold (not shown) connected to the cylinder head 1, and then Is introduced into the cylinder head 1 from the intake port.
On the other hand, with respect to the exhaust port 3, in the cylinder head that is the subject of the present invention, an exhaust collecting portion in which all the exhaust ports 3 are gathered at the center in the cylinder arrangement direction is integrally formed with the cylinder head 1. The exhaust collecting portion is formed in the following structure according to the present invention.

すなわち、＃１気筒と＃４気筒の排気ポート３同士は、爆発行程の間隔が離れて排気干渉しにくく、同じく＃２気筒と＃３気筒同士の排気ポート３同士も排気干渉しにくく、＃１気筒及び＃４気筒の排気ポート３と、＃２気筒及び＃３気筒の排気ポート３とは、爆発行程が隣り合って排気干渉しやすい。
そこで、排気干渉しにくい＃１気筒と＃４気筒同士の排気ポート３をシリンダヘッド１内部で合流し、同じく排気干渉しにくい＃２気筒と＃３気筒同士の排気ポート３をシリンダヘッド１内部で合流させる一方、これら各合流された合流部同士、つまり排気干渉しやすい排気ポート同士は、排気流を分離する構造とする。 That is, the exhaust ports 3 of the # 1 cylinder and the # 4 cylinder are separated from each other by the interval of the explosion stroke so that the exhaust interference does not easily occur. Similarly, the exhaust ports 3 of the # 2 cylinder and the # 3 cylinder do not easily interfere with each other. The exhaust port 3 of the cylinder and the # 4 cylinder and the exhaust port 3 of the # 2 cylinder and the # 3 cylinder are adjacent to each other in the explosion stroke and are likely to interfere with the exhaust.
Therefore, the exhaust ports 3 between the # 1 cylinder and # 4 cylinder that are less likely to interfere with exhaust gas are merged inside the cylinder head 1, and the exhaust ports 3 between the # 2 cylinder and # 3 cylinder that are also less likely to interfere with exhaust gas are located within the cylinder head 1. On the other hand, the merged portions, that is, the exhaust ports that are likely to interfere with the exhaust, are separated from each other.

具体的には、＃２気筒と＃３気筒の排気ポート３同士を、シリンダヘッド１の上部で合流させ、＃１気筒及び＃４気筒の排気ポート３同士を、シリンダヘッド１の下部で合流させ、これら各合流部３Ａ，３Ｂ同士は排気出口まで、隔壁１１によって隔離して排気流を分離する構造とする。
なお、上記各合流部３Ａ，３Ｂから排気出口までの部分は、シリンダヘッド１の排気側側面を突出して形成されている。 Specifically, the exhaust ports 3 of the # 2 cylinder and the # 3 cylinder are merged at the upper part of the cylinder head 1, and the exhaust ports 3 of the # 1 cylinder and the # 4 cylinder are merged at the lower part of the cylinder head 1. The merging portions 3A and 3B are separated from each other by the partition wall 11 up to the exhaust outlet to separate the exhaust flow.
In addition, the part from each said confluence | merging part 3A, 3B to an exhaust outlet is formed so that the exhaust side surface of the cylinder head 1 may protrude.

ここで、合流部３Ａ，３Ｂにおける各通路断面をシリンダ配列方向に偏平な形状として、前記各合流部３Ａ，３Ｂを上下（シリンダ軸方向）に分割することによりシリンダヘッド１の高さが増大することを抑制しつつ、通路断面積を確保している。
また、シリンダ配列方向に冷却水を流通させる２つのウォータジャケット１２，１３が、シリンダヘッド１の各排気ポート３を挟んで上下に設けられる。ウォータジャケット１２，１３は、それぞれ、対応する排気ポート３群の外延に沿うように、シリンダ配列方向の中央部分が排気出口側に向けて形成され、特に、上側のウォータジャケット１２は、同中央部分が合流部３Ａの上部を跨ぐように上側にも突出して形成されている。 Here, the height of the cylinder head 1 is increased by dividing each passage section in the merging portions 3A and 3B into a flat shape in the cylinder arrangement direction and dividing the merging portions 3A and 3B vertically (in the cylinder axial direction). While suppressing this, the passage cross-sectional area is secured.
In addition, two water jackets 12 and 13 for circulating cooling water in the cylinder arrangement direction are provided above and below the exhaust ports 3 of the cylinder head 1. Each of the water jackets 12 and 13 is formed so that the central portion in the cylinder arrangement direction faces the exhaust outlet side so as to extend along the outer extension of the corresponding group of exhaust ports 3, and in particular, the upper water jacket 12 has the same central portion. Is formed so as to protrude also on the upper side so as to straddle the upper part of the joining portion 3A.

かかる構成とすれば、排気干渉しやすい排気ポート３同士が、排気出口に至るまで隔壁１１で隔離されて排気流を分離されることにより、排気脈動が他の排気ポートへ伝達されるのを抑制して排気干渉を確実に防止することができ、ひいては、残ガス量を減少させてエンジントルクの低下、燃焼室温度上昇によるノッキングの発生を防止できる。
図２は、上記第１の実施形態において、ウォータジャケットを変形した第２の実施例を示す。 With this configuration, the exhaust ports 3 that are likely to interfere with the exhaust are separated by the partition wall 11 until the exhaust outlets are separated and the exhaust flow is separated, thereby suppressing the exhaust pulsation from being transmitted to other exhaust ports. Thus, it is possible to reliably prevent the exhaust interference, and consequently reduce the amount of residual gas, thereby preventing the occurrence of knocking due to a decrease in engine torque and a rise in combustion chamber temperature.
FIG. 2 shows a second example in which the water jacket is deformed in the first embodiment.

本第２の実施形態では、上側のウォータジャケット１２’のシリンダ配列方向中央部分を、＃２気筒と＃３気筒の排気ポートの合流部３Ａとの干渉を回避するため、該合流部３Ａのシリンダ側に凹ませて形成している。このようにすれば、第１の実施形態のように、合流部３Ａの上側を跨いで形成した場合より、シリンダヘッド１の高さを、より低くすることが可能となる。   In the second embodiment, in order to avoid interference between the central portion of the upper water jacket 12 'in the cylinder arrangement direction with the merging portion 3A of the exhaust port of the # 2 cylinder and the # 3 cylinder, the cylinder of the merging portion 3A It is dented to the side. If it does in this way, it will become possible to make the height of the cylinder head 1 lower than the case where it forms over 3 A of merge parts like 1st Embodiment.

図３は、本発明を、Ｖ型８気筒内燃機関に適用した第３の実施形態を示す。
本内燃機関の点火順序は、＃１→＃８→＃７→＃３→＃６→＃５→＃４→＃２である。
したがって、左バンク側のシリンダヘッド１Ｌについては、＃１気筒と＃３気筒の排気ポート３Ｌ同士、＃５気筒と＃７気筒の排気ポート３Ｌ同士が、爆発行程が離れて排気干渉しにくく、＃１気筒及び＃３気筒の排気ポート３Ｌと、＃５気筒及び＃７気筒の排気ポート３Ｌとは、排気干渉しやすい。 FIG. 3 shows a third embodiment in which the present invention is applied to a V-type 8-cylinder internal combustion engine.
The ignition order of the internal combustion engine is # 1 → # 8 → # 7 → # 3 → # 6 → # 5 → # 4 → # 2.
Accordingly, for the cylinder head 1L on the left bank side, the exhaust ports 3L of the # 1 cylinder and the # 3 cylinder, the exhaust ports 3L of the # 5 cylinder and the # 7 cylinder are separated from each other by the explosion stroke, and the exhaust interference is difficult. The exhaust ports 3L of the 1st cylinder and the # 3 cylinder and the exhaust ports 3L of the # 5 and # 7 cylinders are likely to interfere with exhaust.

そこで、＃１気筒と＃３気筒の排気ポート３Ｌ同士をシリンダヘッド１の上部で合流させ、＃５気筒と＃７気筒の排気ポート３Ｌ同士をシリンダヘッド１ＬＨの下部で合流させ、これら各合流された合流部３ＡＬ，３ＢＬ同士、つまり排気干渉しやすい排気ポート３Ｌ同士は、隔壁１１Ｌによって排気流を分離する構造とする。
また、右バンク側のシリンダヘッド１Ｒについては、＃２気筒と＃６気筒の排気ポート３同士、＃４気筒と＃８気筒の排気ポート３Ｒ同士が排気干渉しにくく、＃１気筒及び＃３気筒の排気ポート３と、＃５気筒及び＃７気筒の排気ポート３Ｒとは、排気干渉しやすい。 Therefore, the exhaust ports 3L of the # 1 cylinder and the # 3 cylinder are merged at the upper part of the cylinder head 1, and the exhaust ports 3L of the # 5 cylinder and the # 7 cylinder are merged at the lower part of the cylinder head 1LH. The joining portions 3AL and 3BL, that is, the exhaust ports 3L that are likely to interfere with exhaust gas, have a structure in which the exhaust flow is separated by the partition wall 11L.
For the cylinder head 1R on the right bank side, the exhaust ports 3 of the # 2 cylinder and the # 6 cylinder, the exhaust ports 3R of the # 4 cylinder and the # 8 cylinder do not easily interfere with each other, and the # 1 cylinder and the # 3 cylinder The exhaust port 3 and the exhaust ports 3R of the # 5 and # 7 cylinders are likely to interfere with exhaust.

そこで、＃２気筒と＃６気筒の排気ポート３Ｒ同士をシリンダヘッド１Ｒの下部で合流させ、＃４気筒と＃８気筒の排気ポート３Ｒ同士をシリンダヘッド１Ｒの上部で合流させ、これら各合流された合流部３ＡＲ，３ＢＲ同士、つまり排気干渉しやすい排気ポート同士は、隔壁１１Ｒによって排気流を分離する構造とする。
このようにすることで、左右のバンクについて、それぞれ排気干渉しやすい排気ポート３Ｌ（３Ｒ）同士が、排気出口に至るまで隔壁１１Ｌ（１１Ｒ）で隔離されて排気流を分離されることにより、排気脈動が他の排気ポート３Ｌ（３Ｒ）へ伝達されるのを抑制して排気干渉を確実に防止することができ、ひいては、残ガス量を減少させてエンジントルクの低下、燃焼室温度上昇によるノッキングの発生を防止できる。 Therefore, the exhaust ports 3R of the # 2 cylinder and the # 6 cylinder are merged at the lower part of the cylinder head 1R, and the exhaust ports 3R of the # 4 cylinder and the # 8 cylinder are merged at the upper part of the cylinder head 1R. The joining portions 3AR and 3BR, that is, the exhaust ports that are likely to interfere with the exhaust, have a structure in which the exhaust flow is separated by the partition wall 11R.
By doing so, the exhaust ports 3L (3R) that are liable to interfere with each other in the left and right banks are separated by the partition wall 11L (11R) until reaching the exhaust outlet, and the exhaust flow is separated. It is possible to prevent the pulsation from being transmitted to the other exhaust ports 3L (3R) to reliably prevent the exhaust interference. As a result, the residual gas amount is reduced to reduce the engine torque, and the knocking due to the increase in the combustion chamber temperature. Can be prevented.

また、左右のバンクについて、第１，第２の実施形態同様に、上部と下部にウォータージャケット１２Ｌ，１３Ｌ（１２Ｒ，１３Ｒ）を設けるが、それぞれ上側の排気ポート３Ｌ（３Ｒ）同士の合流部３ＡＬ（３ＡＲ）の気筒配列方向中央部より片側の排気ポート３Ｌ（３Ｒ）の張り出しが無い、又は張り出しの小さい側の側面を、上側のウォータージャケット１２Ｌ（１２Ｒ）を回り込ませて覆うように、下側に段差を設けて形成する。   Further, as in the first and second embodiments, the water jackets 12L and 13L (12R and 13R) are provided on the left and right banks at the upper and lower portions, respectively, but the merging portion 3AL between the upper exhaust ports 3L (3R). (3AR) The lower side of the exhaust port 3L (3R) on one side from the center of the cylinder arrangement direction is not overhanging or covers the side surface on the side where the overhanging is small by wrapping around the upper water jacket 12L (12R). Are provided with a step.

このようにすれば、排気ポートが合流して過熱しやすい部分を、上面と側面の双方を覆うウォータージャケット１２Ｌ（１２Ｒ）によって、効率よく冷却することができる。
以上示した実施形態では、排気出口部において、排気干渉しやすい排気ポート同士の排気流を、シリンダヘッドの構造部材で形成した隔壁で分離する構造を示したが、その他の、排気流を分離する構造を、図４に示す。 If it does in this way, the part which an exhaust port joins and tends to overheat can be efficiently cooled by water jacket 12L (12R) which covers both an upper surface and a side.
In the above-described embodiment, the exhaust flow between the exhaust ports that are likely to interfere with the exhaust is separated by the partition formed by the structural member of the cylinder head at the exhaust outlet, but other exhaust flows are separated. The structure is shown in FIG.

図４の（Ａ）は、シリンダヘッド１とは別部品で形成した隔壁２１によって、排気出口の通路断面を分割する構造としたものを示す。
図４の（Ｂ）は、排気出口部の通路断面をだるま形状とし、中央の内側に突出する部分３１の整流作用で上下の排気干渉を生じやすい排気ポートの排気流を分離する構造としたものを示す。 FIG. 4A shows a structure in which the passage section of the exhaust outlet is divided by a partition wall 21 formed as a separate part from the cylinder head 1.
FIG. 4B shows a structure in which the passage cross section of the exhaust outlet portion has a darling shape, and the exhaust flow of the exhaust port that tends to cause vertical exhaust interference by the rectifying action of the portion 31 protruding inside the center is separated. Indicates.

本発明の第１の実施形態を示す直列４気筒内燃機関のシリンダヘッドの平面、正面、側面をそれぞれ示す図。The figure which shows the plane of the cylinder head of the in-line 4 cylinder internal combustion engine which shows the 1st Embodiment of this invention, the front, and the side, respectively. 本発明の第２の実施形態を示す直列４気筒内燃機関のシリンダヘッドの平面、正面、側面をそれぞれ示す図。The figure which shows the plane of the cylinder head of the in-line 4 cylinder internal combustion engine which shows the 2nd Embodiment of this invention, the front, and the side, respectively. 本発明の第３の実施形態を示すＶ型８気筒内燃機関のシリンダヘッドの各バンクの平面及び正面をそれぞれ示す図。The figure which each shows the plane and front of each bank of the cylinder head of a V type 8 cylinder internal combustion engine which shows the 3rd Embodiment of this invention. 同上各実施形態における排気出口部構造の変形態様を示す図。The figure which shows the deformation | transformation aspect of the exhaust outlet part structure in each embodiment same as the above.

符号の説明Explanation of symbols

１，１Ｌ，１Ｒ シリンダヘッド
２ シリンダ頂部
３，３Ｌ，３Ｒ 排気ポート
３Ａ，３ＡＬ，３ＡＲ 一方の排気干渉しない排気ポート同士の合流部
３Ｂ，３ＢＬ，３ＢＲ 他方の排気干渉しない排気ポート同士の合流部
１１，２１ 隔壁
１２，１２Ｌ，１２Ｒ 上側のウォータジャケット
１３，１３Ｌ，１３Ｒ 下側のウォータジャケット
１１ 燃焼室部ウォータジャケット
２１ 排気集合部ウォータジャケット
２１Ａ 排気集合部下部ウォータジャケット
２１Ｂ 排気集合部上部ウォータジャケット
２１Ｃ 連通部ウォータジャケット
３１ 排気出口部通路断面の内側に突出する部分 1,1L, 1R Cylinder head
2 Cylinder top 3, 3L, 3R Exhaust port 3A, 3AL, 3AR Junction between exhaust ports that do not interfere with one exhaust 3B, 3BL, 3BR Merge between exhaust ports that do not interfere with other exhaust
11, 21 Bulkhead 12, 12L, 12R Upper water jacket 13, 13L, 13R Lower water jacket
11 Combustion chamber water jacket
21 Exhaust assembly water jacket
21A Exhaust assembly lower water jacket
21B Exhaust assembly upper water jacket
21C Communication water jacket
31 Portion protruding inside the exhaust outlet section passage section

Claims (5)

複数の燃焼室から延びる排気ポートを集合させた排気集合部を一体形成した内燃機関のシリンダヘッドにおいて、
前記排気集合部で、排気干渉しにくい排気ポート同士を合流させつつ、排気干渉しやすい排気ポート同士の排気流を分離する構造としたことを特徴とする内燃機関のシリンダヘッド。 In a cylinder head of an internal combustion engine integrally forming an exhaust collecting portion in which exhaust ports extending from a plurality of combustion chambers are gathered,
A cylinder head of an internal combustion engine characterized by having a structure that separates exhaust flows between exhaust ports that are likely to interfere with exhaust gas while joining exhaust ports that are less likely to interfere with exhaust gas at the exhaust collecting portion. 前記排気干渉しやすい排気ポート同士を、シリンダ軸方向にずらすことによって、排気流を分離する構造としたことを特徴とする請求項１に記載の内燃機関のシリンダヘッド。   2. The cylinder head of the internal combustion engine according to claim 1, wherein the exhaust flow is separated by shifting the exhaust ports that are likely to interfere with the exhaust gas in the cylinder axial direction. 前記排気干渉しやすい排気ポート同士を、シリンダヘッド構造部材または、別部品によってシリンダ軸方向に隔離することにより、排気流を分離する構造としたことを特徴とする請求項２に記載の内燃機関のシリンダヘッド。   The internal combustion engine according to claim 2, wherein the exhaust ports that are likely to interfere with exhaust gas are separated from each other in the cylinder axial direction by a cylinder head structural member or a separate part, thereby separating the exhaust flow. cylinder head. 前記排気干渉しやすい排気ポート同士を、排気出口部の通路断面をシリンダ軸方向中央部分が内側に突出するだるま形状とすることにより、整流作用で排気流を分離する構造としたことを特徴とする請求項２に記載の内燃機関のシリンダヘッド。   The exhaust ports, which are likely to interfere with the exhaust, have a structure in which the exhaust flow is separated by a rectifying action by making the passage cross section of the exhaust outlet part a dome shape with the central portion in the cylinder axial direction protruding inward. The cylinder head of the internal combustion engine according to claim 2. 前記排気干渉しやすい排気ポートに対してシリンダ軸方向にずれた排気ポートの側方部分を覆うようにウォータジャケットが形成されていることを特徴とする請求項２〜請求項４のいずれか１つに記載の内燃機関のシリンダヘッド。   The water jacket is formed so as to cover a side portion of the exhaust port that is displaced in the cylinder axial direction with respect to the exhaust port that is likely to interfere with the exhaust. The cylinder head of the internal combustion engine described in 1.
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