JP5779558B2 - Engine exhaust manifold - Google Patents

Engine exhaust manifold Download PDF

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JP5779558B2
JP5779558B2 JP2012183841A JP2012183841A JP5779558B2 JP 5779558 B2 JP5779558 B2 JP 5779558B2 JP 2012183841 A JP2012183841 A JP 2012183841A JP 2012183841 A JP2012183841 A JP 2012183841A JP 5779558 B2 JP5779558 B2 JP 5779558B2
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exhaust
exhaust manifold
head side
build
engine
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JP2014040808A (en
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小山　秀行
秀行 小山
宮▲崎▼　学
学 宮▲崎▼
藤井　聡
聡 藤井
諭 長谷川
諭 長谷川
達也 森本
達也 森本
篠原　祐次
祐次 篠原
神 深田
神 深田
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Kubota Corp
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Kubota Corp
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Description

本発明は、エンジンの排気マニホルドに関し、詳しくは、シリンダヘッドと排気入口フランジとの間のシール性の低下を抑制することができる、エンジンの排気マニホルドに関する。   The present invention relates to an exhaust manifold of an engine, and more particularly to an exhaust manifold of an engine that can suppress a decrease in sealing performance between a cylinder head and an exhaust inlet flange.

従来、エンジンの排気マニホルドとして、排気マニホルドの中央に配置された排気合流部と、この排気合流部の両端側に配置された複数の枝管とを備え、各枝管にシリンダヘッドに取り付ける排気入口フランジを設けたものがある(例えば、特許文献１参照)。
しかし、この従来技術では、シリンダヘッドに対向させるヘッド側面とその反対側の反ヘッド側面のうち、反ヘッド側面にその長手方向に沿うリブ状の反ヘッド側肉盛り部を形成するに当たり、排気合流部と枝管の両方に反ヘッド側肉盛り部を形成しているため、問題がある。 2. Description of the Related Art Conventionally, as an exhaust manifold of an engine, an exhaust inlet that includes an exhaust merging portion disposed at the center of the exhaust manifold and a plurality of branch pipes disposed at both ends of the exhaust merging portion, and is attached to the cylinder head in each branch pipe Some have a flange (see, for example, Patent Document 1).
However, in this prior art, of forming the rib-like anti-head-side build-up portion along the longitudinal direction on the anti-head side surface out of the head side surface facing the cylinder head and the opposite anti-head side surface, There is a problem because the head-side built-up portion is formed in both the portion and the branch pipe.

特開２００１−２０７８４１号公報(図１、図２参照)JP 2001-207841 A (see FIGS. 1 and 2)

《問題》 シリンダヘッドと排気マニホルドの排気入口フランジとの間のシール性が低下しやすい。
排気合流部と枝管の両方に反ヘッド側肉盛り部を形成しているため、エンジン運転後にエンジンを停止すると、シリンダヘッドと排気マニホルドの排気入口フランジとの間のシール性が低下しやすい。 <Problem> The sealing performance between the cylinder head and the exhaust inlet flange of the exhaust manifold is likely to deteriorate.
Since the anti-head-side build-up portion is formed in both the exhaust merging portion and the branch pipe, when the engine is stopped after the engine is operated, the sealing performance between the cylinder head and the exhaust inlet flange of the exhaust manifold is likely to deteriorate.

本発明の課題は、シリンダヘッドと排気マニホルドの排気入口フランジとの間のシール性の低下を抑制することができる、エンジンの排気マニホルドを提供することにある。   The subject of this invention is providing the exhaust manifold of an engine which can suppress the fall of the sealing performance between a cylinder head and the exhaust inlet flange of an exhaust manifold.

《発明に至る経過》
本発明の発明者らは、エンジンの排気マニホルドを研究した結果、次の知見を得た。
エンジン運転中、排気合流部には各枝管を通過した高温の排気が合流して通過するため、排気合流部の肉壁の蓄熱量は、各枝管のそれに比べて多く、エンジン停止後のこれらの温度低下速度差、ひいては、温度差が大きくなり、排気マニホルドの熱歪みにより、シリンダヘッドと排気マニホルドの排気入口フランジとの間のシール性が低下しやすい。特に、排気温度が高い高負荷運転後にはこの問題が顕在化する。
本発明者らは、この知見に基づき、本発明に至った。 《Progress to invention》
The inventors of the present invention have studied the engine exhaust manifold and obtained the following knowledge.
During engine operation, high-temperature exhaust gas that has passed through each branch pipe joins and passes through the exhaust merge section, so the amount of heat stored in the wall of the exhaust merge section is greater than that in each branch pipe, and after the engine is stopped These temperature drop speed differences, and hence the temperature difference, become large, and the sealing performance between the cylinder head and the exhaust inlet flange of the exhaust manifold is likely to deteriorate due to thermal distortion of the exhaust manifold. In particular, this problem becomes apparent after high load operation where the exhaust temperature is high.
Based on this finding, the present inventors have reached the present invention.

請求項１に係る発明の発明特定事項は、次の通りである。
図１〜図３に例示するように、排気マニホルド(１)の中央に配置された排気合流部(２)と、この排気合流部(２)の両端側に配置された複数の枝管(３)(３)とを備え、各枝管(３)にシリンダヘッドに取り付ける排気入口フランジ(４)を設けた、エンジンの排気マニホルドにおいて、
シリンダヘッドに対向させる排気マニホルド(１)のヘッド側面(１ａ)とその反対側の反ヘッド側面(１ｂ)のうち、反ヘッド側面(１ｂ)にその長手方向に沿うリブ状の反ヘッド側肉盛り部(７)を形成するに当たり、
両端の枝管(３)(３)に反ヘッド側肉盛り部(７)(７)を形成し、排気合流部(２)に反ヘッド側肉盛り部(７)のない反ヘッド側面(１ｂ)を形成した、ことを特徴とするエンジンの排気マニホルド。 Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIGS. 1 to 3, an exhaust merging portion (2) disposed at the center of the exhaust manifold (1) and a plurality of branch pipes (3) disposed at both ends of the exhaust merging portion (2). ) (3), and provided with an exhaust inlet flange (4) attached to the cylinder head in each branch pipe (3).
Of the head side surface (1a) of the exhaust manifold (1) opposed to the cylinder head and the opposite head side surface (1b) on the opposite side, the rib side anti-head side build-up along the longitudinal direction of the head side surface (1b) In forming part (7),
Anti-head side build-up portions (7) and (7) are formed in the branch pipes (3) and (3) at both ends, and the anti-head side surface (1b) without the anti-head side build-up portion (7) in the exhaust merge portion (2). An exhaust manifold of the engine, characterized in that

(請求項１に係る発明)
請求項１に係る発明は、次の効果を奏する。
《効果》 シリンダヘッドと排気マニホルドの排気入口フランジとの間のシール性の低下を抑制することができる。
図１〜図３に例示するように、両端の枝管(３)(３)に反ヘッド側肉盛り部(７)(７)を形成し、排気合流部(２)に反ヘッド側肉盛り部(７)のない反ヘッド側面(１ｂ)を形成したので、エンジン運転中の枝管(３)(３)の肉壁の蓄熱量が、排気合流部(２)のそれに近づき、エンジン停止後のこれらの温度低下速度差、ひいては、温度差が小さくなり、排気マニホルド(１)の熱歪みが抑制され、シリンダヘッドと排気マニホルド(１)の排気入口フランジ(４)との間のシール性の低下を抑制することができる。 (Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to suppress a decrease in the sealing performance between the cylinder head and the exhaust inlet flange of the exhaust manifold.
As shown in FIGS. 1 to 3, anti-head-side build-up portions (7) and (7) are formed in the branch pipes (3) and (3) at both ends, and the anti-head-side build-up is formed in the exhaust merge portion (2). Since the anti-head side face (1b) without the part (7) is formed, the heat storage amount of the wall of the branch pipe (3) (3) during engine operation approaches that of the exhaust merging part (2), and after the engine stops Thus, the temperature difference between the cylinder head and the exhaust inlet flange (4) of the exhaust manifold (1) is suppressed, and the heat distortion of the exhaust manifold (1) is suppressed. The decrease can be suppressed.

(請求項２に係る発明)
請求項２に係る発明は、請求項１に係る発明の効果に加え、次の効果を奏する。
《効果》 排気マニホルドの熱歪みが抑制される。
図２、図３に例示するように、ヘッド側肉盛り部(８)でも、反ヘッド側肉盛り部(７)と同様の機能が得られるので、排気マニホルド(１)の熱歪みが抑制される。また、排気マニホルド(１)がリブ状のヘッド側肉盛り部(８)と反ヘッド側肉壁部(７)の両方で補強されているので、この点でも排気マニホルド(１)の熱歪みが抑制される。 (Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Thermal distortion of the exhaust manifold is suppressed.
As illustrated in FIGS. 2 and 3, the head-side built-up portion (8) can obtain the same function as the non-head-side built-up portion (7), so that thermal distortion of the exhaust manifold (1) is suppressed. The Further, since the exhaust manifold (1) is reinforced by both the rib-like head side build-up portion (8) and the non-head side wall portion (7), the heat distortion of the exhaust manifold (1) is also in this respect. It is suppressed.

(請求項３に係る発明)
請求項３に係る発明は、請求項１または請求項２に係る発明の効果に加え、次の効果を奏する。
《効果》 排気マニホルドの熱歪みが抑制される。
図１〜図３に例示するように、排気合流部(２)に排気導入管(２ａ)とこの排気導入管(２ａ)から上向きに導出した排気導出管(２ｂ)を設け、この排気導出管(２ｂ)の導出端に排気出口フランジ(６)を形成し、枝管(３)の上面(５)にリブ状の上面肉盛り部(１０)を形成し、枝管(３)の下面にはリブ状の肉盛部を形成しないので、排気合流部(２)の上側と枝管(３)の上側の蓄熱量が平衡に近づき、エンジン停止後のこれらの温度低下速度差、ひいては、温度差が小さくなり、排気マニホルド(１)の熱歪みが抑制される。 (Invention of Claim 3 )
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2 .
<Effect> Thermal distortion of the exhaust manifold is suppressed.
As shown in FIGS. 1 to 3 , an exhaust introduction pipe (2 a) and an exhaust lead pipe (2 b) led upward from the exhaust introduction pipe (2 a) are provided in the exhaust merge section (2), and this exhaust lead pipe An exhaust outlet flange (6) is formed at the lead-out end of (2b), a rib-like upper surface build-up portion (10) is formed on the upper surface (5) of the branch pipe (3), and a lower surface of the branch pipe (3) is formed. Does not form a rib-like built-up part, the heat storage amount on the upper side of the exhaust merging part (2) and the upper side of the branch pipe (3) approaches equilibrium, and the difference in temperature decrease rate after the engine stops, The difference is reduced and thermal distortion of the exhaust manifold (1) is suppressed.

(請求項４に係る発明)
請求項４に係る発明は、請求項３に係る発明の効果に加え、次の効果を奏する。
《効果》 上面肉盛り部がマニホルド取付ボルトの取り付けの邪魔になることがない。
図１〜図３に例示するように、リブ状の上面肉盛り部(１０)を排気マニホルド(１)の長手方向と交差する方向に沿わせ、この上面肉盛り部(１０)をマニホルド取付ボルトのボルト挿通ボス(１１)としたので、上面肉盛り部(１０)がマニホルド取付ボルトの取り付けの邪魔になることがない。 (Invention of Claim 4 )
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 3 .
<Effect> The upper surface build-up portion does not obstruct the mounting of the manifold mounting bolt.
As illustrated in FIGS. 1 to 3 , the rib-shaped upper surface buildup portion (10) is set along the direction intersecting the longitudinal direction of the exhaust manifold (1), and the upper surface buildup portion (10) is connected to the manifold mounting bolt. Since the bolt insertion boss (11) is used, the upper surface build-up portion (10) does not obstruct the mounting of the manifold mounting bolt.

本発明の第１実施形態に係る排気マニホルドを説明する図で、図１(Ａ)は平面図、図１(Ｂ)は側面図、図１(Ｃ)は図１(Ｂ)のＣ−Ｃ線断面図、図１(Ｄ)は図１(Ｂ)のＤ−Ｄ線断面図、図１(Ｅ)は図１(Ｂ)のＥ方向矢視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an exhaust manifold according to a first embodiment of the present invention, in which FIG. 1 (A) is a plan view, FIG. 1 (B) is a side view, and FIG. 1D is a cross-sectional view taken along the line DD of FIG. 1B, and FIG. 1E is a view taken in the direction of the arrow E in FIG. 1B. 本発明の第２実施形態に係る排気マニホルドを説明する図で、図２(Ａ)は平面図、図２(Ｂ)は側面図である。It is a figure explaining the exhaust manifold which concerns on 2nd Embodiment of this invention, FIG. 2 (A) is a top view, FIG.2 (B) is a side view. 本発明の第３実施形態に係る排気マニホルドを説明する図で、図３(Ａ)は平面図、図３(Ｂ)は側面図である。FIG. 3A is a plan view and FIG. 3B is a side view illustrating an exhaust manifold according to a third embodiment of the present invention. 本発明の参考形態に係る排気マニホルドを説明する図で、図４(Ａ)は平面図、図４(Ｂ)は側面図である。FIG. 4A is a plan view and FIG. 4B is a side view illustrating an exhaust manifold according to a reference embodiment of the present invention.

図１〜図３は本発明の実施形態に係るエンジンの排気マニホルドを説明する図であり、図１は第１実施形態、図２は第２実施形態、図３は第３実施形態である。図４は参考形態である。
各実施形態と参考形態では、過給機付きの立型直列４気筒ディーゼルエンジンの排気マニホルドについて説明する。 1 to 3 are views for explaining an exhaust manifold of an engine according to the embodiment of the present invention, FIG. 1 is a first embodiment, FIG. 2 is a second embodiment, FIG. 3 is a third embodiment. FIG. 4 is a reference form .
In each embodiment and reference embodiment , an exhaust manifold of a vertical in-line four-cylinder diesel engine with a supercharger will be described.

まず、第１実施形態について説明する。
図１(Ａ)(Ｂ)に示すように、排気マニホルド(１)の中央に配置された排気合流部(２)と、この排気合流部(２)の両端側に配置された複数の枝管(３)(３)とを備え、各枝管(３)にシリンダヘッドに取り付ける排気入口フランジ(４)を設けている。
排気合流部(２)には、排気導入管(２ａ)とこの排気導入管(２ａ)から導出した排気導出管(２ｂ)を設け、この排気導出管(２ｂ)の導出端に排気出口フランジ(６)を形成している。排気出口フランジ(６)には、過給機を取り付ける。図１(Ｂ)に示すように、排気導入管(２ａ)から排気導出管(２ｂ)を上向きに導出し、排気導出管(２ｂ)の下方に位置する排気導入管(２ａ)の下壁(９)を上向きに凹入させている。枝管(３)は各シリンダの排気を通過させる管で、排気合流部(２)は複数の枝管(３)(３)の排気を合流させる部分である。
平面視で、排気マニホルド(１)は、排気合流部(２)と、両端の一対の枝管(３)(３)とで弓形管を形成し、この弓形管のシリンダヘッド側に中央寄りの一対の枝管(３)(３)を形成している。中央寄りの一対の枝管(３)(３)の隣り合う排気入口フランジ(４)(４)同士は架橋部(１２)で相互に連結されている。 First, the first embodiment will be described.
As shown in FIGS. 1 (A) and 1 (B), an exhaust merging portion (2) disposed at the center of the exhaust manifold (1) and a plurality of branch pipes disposed at both ends of the exhaust merging portion (2). (3) and (3), and each branch pipe (3) is provided with an exhaust inlet flange (4) attached to the cylinder head.
The exhaust junction section (2) is provided with an exhaust introduction pipe (2a) and an exhaust lead pipe (2b) derived from the exhaust introduction pipe (2a), and an exhaust outlet flange ( 6) is formed. A supercharger is attached to the exhaust outlet flange (6). As shown in FIG. 1B, the exhaust lead pipe (2b) is led upward from the exhaust lead pipe (2a), and the lower wall of the exhaust lead pipe (2a) located below the exhaust lead pipe (2b) ( 9) is recessed upward. The branch pipe (3) is a pipe through which the exhaust of each cylinder passes, and the exhaust merging section (2) is a section where the exhaust of the plurality of branch pipes (3) (3) is joined.
In plan view, the exhaust manifold (1) forms an arcuate tube with the exhaust confluence (2) and a pair of branch pipes (3) (3) at both ends, and is located closer to the center of the arcuate tube on the cylinder head side. A pair of branch pipes (3) and (3) is formed. The adjacent exhaust inlet flanges (4) and (4) of the pair of branch pipes (3) and (3) closer to the center are connected to each other by a bridging portion (12).

図１(Ａ)に示すように、シリンダヘッドに対向させる排気マニホルド(１)のヘッド側面(１ａ)とその反対側の反ヘッド側面(１ｂ)のうち、反ヘッド側面(１ｂ)にその長手方向に沿うリブ状の反ヘッド側肉盛り部(７)を形成するに当たり、両端の枝管(３)(３)に反ヘッド側肉盛り部(７)(７)を形成し、排気合流部(２)に反ヘッド側肉盛り部(７)のない反ヘッド側面(１ｂ)を形成している。   As shown in FIG. 1 (A), of the exhaust manifold (1) facing the cylinder head, the head side surface (1a) and the opposite side surface (1b) opposite to the head side surface (1b) are arranged in the longitudinal direction. Are formed on the branch pipes (3) and (3) at both ends, and the exhaust merging portion (7) is formed. The anti-head side surface (1b) without the anti-head-side build-up portion (7) is formed in 2).

図１(Ａ)(Ｂ)に示すように、排気合流部(２)に排気導入管(２ａ)とこの排気導入管(２ａ)から上向きに導出した排気導出管(２ｂ)を設け、この排気導出管(２ｂ)の導出端に排気出口フランジ(６)を形成し、枝管(３)の上面(５)にリブ状の上面肉盛り部(１０)を形成し、枝管(３)の下面にはリブ状の肉盛部を形成しない。   As shown in FIGS. 1A and 1B, an exhaust introduction pipe (2a) and an exhaust lead-out pipe (2b) led upward from the exhaust introduction pipe (2a) are provided in the exhaust merging section (2). An exhaust outlet flange (6) is formed at the lead-out end of the lead-out pipe (2b), a rib-like upper surface build-up part (10) is formed on the top face (5) of the branch pipe (3), and the branch pipe (3) A rib-shaped build-up portion is not formed on the lower surface.

図１(Ａ)(Ｂ)(Ｃ)(Ｅ)に示すように、リブ状の上面肉盛り部(１０)を排気マニホルド(１)の長手方向と交差する方向に沿わせ、この上面肉盛り部(１０)をマニホルド取付ボルトのボルト挿通ボス(１１)としている。
ボルト挿通ボス(１１)としているのは、両端側の枝管(３)(３)の上面肉盛り部(１０)(１０)のみで、中央の一対の枝管(３)(３)の上面肉盛り部(１０)(１０)はボルト挿通ボス(１１)にはなっていない。 As shown in FIGS. 1 (A), (B), (C), and (E), the rib-shaped upper surface buildup portion (10) is placed along the direction intersecting the longitudinal direction of the exhaust manifold (1), and this upper surface buildup is performed. The portion (10) is a bolt insertion boss (11) of the manifold mounting bolt.
The bolt insertion bosses (11) are only the upper surface build-up portions (10) and (10) of the branch pipes (3) and (3) on both ends, and the upper surfaces of the pair of central branch pipes (3) and (3). The built-up portions (10) and (10) are not bolt insertion bosses (11).

図２に示す第２実施形態と、図３に示す第３実施形態は、第１実施形態にヘッド寄り肉盛り部(８)を追加したものである。
すなわち、図２(Ａ)または図３(Ａ)に示すように、排気マニホルド(１)のヘッド側面(１ａ)にその長手方向に沿うリブ状のヘッド側肉盛り部(８)を形成するに当たり、両端の枝管(３)(３)にヘッド側肉盛り部(８)(８)を形成し、排気合流部(２)に、ヘッド側肉盛り部(８)のないヘッド側面(１ａ)を形成している。
第２実施形態のものは、反ヘッド側肉盛部(７)とヘッド側肉盛部(８)の両方を備えているため、反ヘッド側肉盛部(７)の垂直幅(７ａ)は、第１実施形態のそれよりも小さくし、その体積を小さくしている。
第３実施形態のものは、反ヘッド側肉盛部(７)とヘッド側肉盛部(８)の両方を備えているが、いずれも水平方向の突出寸法が小さいため、反ヘッド側肉盛部(７)の垂直幅(７ａ)は、第１実施形態のそれよりも大きくし、その体積を確保している。
また、第２実施形態と第３実施形態では、全ての隣合う排気フランジ(４)(４)同士を架橋部(１２)で相互に連結している。
他の構成は、第１実施形態と同じであり、図２、図３中、第１実施形態と同一の要素には、図１と同じ符号を付しておく。 The second embodiment shown in FIG. 2 and the third embodiment shown in FIG. 3 are obtained by adding a head-side built-up portion (8) to the first embodiment.
That is, as shown in FIG. 2 (A) or FIG. 3 (A), when forming the rib-like head side build-up portion (8) along the longitudinal direction on the head side surface (1a) of the exhaust manifold (1). Further, the head side build-up portions (8) and (8) are formed in the branch pipes (3) and (3) at both ends, and the head side surface (1a) without the head side build-up portion (8) is formed in the exhaust merge portion (2). Is forming.
Since the thing of 2nd Embodiment is equipped with both the anti-head side overlaid part (7) and the head side overlaid part (8), the vertical width (7a) of the anti head side overlaid part (7) is The volume is smaller than that of the first embodiment.
Although the thing of 3rd Embodiment is equipped with both the anti-head side build-up part (7) and the head side build-up part (8), since all are small in the protrusion dimension of a horizontal direction, anti-head side build-up is provided. The vertical width (7a) of the part (7) is made larger than that of the first embodiment to ensure its volume.
Moreover, in 2nd Embodiment and 3rd Embodiment, all the adjacent exhaust flanges (4) (4) are mutually connected by the bridge | bridging part (12).
Other configurations are the same as those in the first embodiment, and the same reference numerals as those in FIG. 1 are given to the same elements as those in the first embodiment in FIGS.

図４に示す参考形態は、反ヘッド側肉盛り部(７)は設けず、ヘッド側肉盛り部(８)のみを設けたものである。
すなわち、図４(Ａ)に示すように、シリンダヘッドに対向させる排気マニホルド(１)のヘッド側面(１ａ)にその長手方向に沿うリブ状のヘッド側肉盛り部(８)を形成するに当たり、両端の枝管(３)(３)にヘッド側肉盛り部(８)(８)を形成し、排気合流部(２)に、ヘッド側肉盛り部(８)のないヘッド側面(１ａ)を形成したものである。
このため、エンジン運転中の枝管(３)(３)の肉壁の蓄熱量が、排気合流部(２)のそれに近づき、エンジン停止後のこれらの温度低下速度差、ひいては、温度差が小さくなり、排気マニホルド(１)の熱歪みが抑制され、シリンダヘッドと排気マニホルド(１)の排気入口フランジ(４)との間のシール性の低下を抑制することができる。
また、参考形態では、第２実施形態と第３実施形態と同様、全ての隣合う排気フランジ(４)(４)同士を架橋部(１２)で相互に連結している。
他の構成は、第１実施形態と同じであり、図４中、第１実施形態と同一の要素には、図１と同じ符号を付しておく。
本発明の実施形態と参考形態は、過給機付きディーゼルエンジンの排気マニホルドについて説明したが、本発明は、これに限らず、自然吸気ディーゼルエンジンの排気マニホルド、過給機付き火花点火式エンジンの排気マニホルド、自然吸気火花点火式エンジンの排気マニホルドに適用してもよいことは勿論である。 In the reference form shown in FIG. 4, the non-head-side built-up portion (7) is not provided, but only the head-side built-up portion (8) is provided.
That is, as shown in FIG. 4 (A), in forming the rib-like head side build-up portion (8) along the longitudinal direction on the head side surface (1a) of the exhaust manifold (1) opposed to the cylinder head, The head side build-up portions (8) and (8) are formed in the branch pipes (3) and (3) at both ends, and the head side surface (1a) without the head side build-up portion (8) is formed in the exhaust merge portion (2). Formed.
For this reason, the amount of heat stored in the wall of the branch pipes (3) and (3) during engine operation approaches that of the exhaust merging section (2), and the difference between the temperature decrease rates after the engine stops, and thus the temperature difference is small. Thus, the thermal distortion of the exhaust manifold (1) is suppressed, and the deterioration of the sealing performance between the cylinder head and the exhaust inlet flange (4) of the exhaust manifold (1) can be suppressed.
Moreover, in the reference form , like the second embodiment and the third embodiment, all the adjacent exhaust flanges (4), (4) are connected to each other by the bridging portion (12).
Other configurations are the same as those of the first embodiment. In FIG. 4, the same reference numerals as those of FIG. 1 are given to the same elements as those of the first embodiment.
Although the embodiment and the reference embodiment of the present invention have been described with respect to the exhaust manifold of a diesel engine with a supercharger, the present invention is not limited to this, the exhaust manifold of a naturally aspirated diesel engine, and the spark ignition engine with a supercharger. Of course, the present invention may be applied to an exhaust manifold and an exhaust manifold of a naturally aspirated spark ignition engine.

(１) 排気マニホルド
(１ａ) ヘッド側面
(１ｂ) 反ヘッド側面
(２) 排気合流部
(２ａ) 排気導入管
(２ｂ) 排気導出管
(３) 枝管
(４) 排気入口フランジ
(５) 上面
(６) 排気出口フランジ
(７) 反ヘッド側肉盛り部
(８) ヘッド側肉盛り部
(９) 下壁
(１０) 上面肉盛り部 (1) Exhaust manifold
(1a) Head side
(1b) Anti-head side
(2) Exhaust junction
(2a) Exhaust pipe
(2b) Exhaust outlet pipe
(3) Branch pipe
(4) Exhaust inlet flange
(5) Top surface
(6) Exhaust outlet flange
(7) Anti-head side overlay
(8) Head side overlay
(9) Lower wall
(10) Top surface overlay

Claims (4)

排気マニホルド(１)の中央に配置された排気合流部(２)と、この排気合流部(２)の両端側に配置された複数の枝管(３)(３)とを備え、各枝管(３)にシリンダヘッドに取り付ける排気入口フランジ(４)を設けた、エンジンの排気マニホルドにおいて、
シリンダヘッドに対向させる排気マニホルド(１)のヘッド側面(１ａ)とその反対側の反ヘッド側面(１ｂ)のうち、反ヘッド側面(１ｂ)にその長手方向に沿うリブ状の反ヘッド側肉盛り部(７)を形成するに当たり、
両端の枝管(３)(３)に反ヘッド側肉盛り部(７)(７)を形成し、排気合流部(２)に反ヘッド側肉盛り部(７)のない反ヘッド側面(１ｂ)を形成した、ことを特徴とするエンジンの排気マニホルド。 An exhaust merging section (2) disposed at the center of the exhaust manifold (1) and a plurality of branch pipes (3) (3) disposed at both ends of the exhaust merging section (2) In the exhaust manifold of the engine provided with the exhaust inlet flange (4) attached to the cylinder head in (3),
Of the head side surface (1a) of the exhaust manifold (1) opposed to the cylinder head and the opposite head side surface (1b) on the opposite side, the rib side anti-head side build-up along the longitudinal direction of the head side surface (1b) In forming part (7),
Anti-head side build-up portions (7) and (7) are formed in the branch pipes (3) and (3) at both ends, and the anti-head side surface (1b) without the anti-head side build-up portion (7) in the exhaust merge portion (2). An exhaust manifold of the engine, characterized in that 請求項１に記載したエンジンの排気マニホルドにおいて、
排気マニホルド(１)のヘッド側面(１ａ)にその長手方向に沿うリブ状のヘッド側肉盛り部(８)を形成するに当たり、
両端の枝管(３)(３)にヘッド側肉盛り部(８)(８)を形成し、排気合流部(２)に、ヘッド側肉盛り部(８)のないヘッド側面(１ａ)を形成した、ことを特徴とするエンジンの排気マニホルド。 The engine exhaust manifold as claimed in claim 1.
In forming the rib-like head side build-up portion (8) along the longitudinal direction on the head side surface (1a) of the exhaust manifold (1),
The head side build-up portions (8) and (8) are formed in the branch pipes (3) and (3) at both ends, and the head side surface (1a) without the head side build-up portion (8) is formed in the exhaust merge portion (2). An engine exhaust manifold characterized by being formed. 請求項１または請求項２に記載したエンジンの排気マニホルドにおいて、
排気合流部(２)に排気導入管(２ａ)とこの排気導入管(２ａ)から上向きに導出した排気導出管(２ｂ)を設け、この排気導出管(２ｂ)の導出端に排気出口フランジ(６)を形成し、枝管(３)の上面(５)にリブ状の上面肉盛り部(１０)を形成し、枝管(３)の下面にはリブ状の肉盛部を形成しない、ことを特徴とするエンジンの排気マニホルド。 In the exhaust manifold of the engine according to claim 1 or 2 ,
An exhaust inlet pipe (2a) and an exhaust outlet pipe (2b) led upward from the exhaust inlet pipe (2a) are provided in the exhaust junction (2), and an exhaust outlet flange (2b) is provided at the outlet end of the exhaust outlet pipe (2b). 6) is formed, a rib-shaped upper surface build-up portion (10) is formed on the upper surface (5) of the branch pipe (3), and a rib-shaped build-up portion is not formed on the lower surface of the branch pipe (3). The engine exhaust manifold is characterized by that. 請求項３に記載したエンジンの排気マニホルドにおいて、
リブ状の上面肉盛り部(１０)を排気マニホルド(１)の長手方向と交差する方向に沿わせ、この上面肉盛り部(１０)をマニホルド取付ボルトのボルト挿通ボス(１１)とした、ことを特徴とするエンジンの排気マニホルド。 The exhaust manifold of the engine according to claim 3 ,
The rib-shaped upper surface buildup part (10) is set along the direction intersecting the longitudinal direction of the exhaust manifold (1), and the upper surface buildup part (10) is used as a bolt insertion boss (11) of the manifold mounting bolt. An engine exhaust manifold characterized by
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