JP2006200491A - Multi-cylinder diesel engine - Google Patents

Multi-cylinder diesel engine Download PDF

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JP2006200491A
JP2006200491A JP2005014964A JP2005014964A JP2006200491A JP 2006200491 A JP2006200491 A JP 2006200491A JP 2005014964 A JP2005014964 A JP 2005014964A JP 2005014964 A JP2005014964 A JP 2005014964A JP 2006200491 A JP2006200491 A JP 2006200491A
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intake
egr gas
port
cylinder
passage
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JP4431062B2 (en
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Toshio Nakanishi
俊夫 中西
Satoru Maekoya
哲 前小屋
Takatoshi Imai
隆敏 今井
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Kubota Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-cylinder diesel engine capable of making EGR gas distribution amount of respective cylinders uniform. <P>SOLUTION: In the multi-cylinder diesel engine, a plurality of the cylinders 1 are provided, a helical suction port 2 and a straight suction port 3 are provided for each of the cylinders 1, and EGR gas 5 is added to suction air 4. EGR gas distribution passage 6 is provided, a plurality of gas distribution outlets 7 of the EGR gas distribution passage 6 are respectively opened only by a port inlet 8 of the respective helical suction ports 2, and thereby the EGR gas 5 is introduced into the respective helical suction ports 2, and is not introduced into the straight suction ports 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、多気筒ディーゼルエンジンに関し、詳しくは、各シリンダへのＥＧＲガス分配量を均等にすることができる多気筒ディーゼルエンジンに関するものである。   The present invention relates to a multi-cylinder diesel engine, and more particularly to a multi-cylinder diesel engine capable of equalizing an EGR gas distribution amount to each cylinder.

従来の多気筒エンジンとして、本発明と同様、複数のシリンダを備え、各シリンダ毎にヘリカル吸気ポートとストレート吸気ポートとを設け、吸気にＥＧＲガスを添加するようにしたものがある(例えば、特許文献１参照)。
この種の多気筒エンジンでは、ヘリカル吸気ポートでシリンダ内にスワールを発生させ、シリンダ内での空気と燃料の混合性能を高めるとともに、ストレート吸気ポートで吸気の充填効率を高めることにより、出力向上を図ることができる利点がある。また、同時に、ＥＧＲガスの添加で最高燃焼温度を低下させることにより、窒素酸化物の発生量を低減させることができる利点もある。 As in the present invention, a conventional multi-cylinder engine includes a plurality of cylinders, each of which is provided with a helical intake port and a straight intake port, and EGR gas is added to the intake air (for example, a patent) Reference 1).
In this type of multi-cylinder engine, the helical intake port generates swirl in the cylinder, improving the mixing performance of air and fuel in the cylinder, and improving the charging efficiency of the intake through the straight intake port. There is an advantage that can be achieved. At the same time, there is an advantage that the amount of nitrogen oxides generated can be reduced by lowering the maximum combustion temperature by adding EGR gas.

しかし、上記従来の多気筒エンジンでは、ＥＧＲガス供給通路の単一のガス出口を吸気分配通路で開口させているため、問題が生じるおそれがある。   However, in the conventional multi-cylinder engine, a single gas outlet of the EGR gas supply passage is opened by the intake air distribution passage, which may cause a problem.

実開平６−６７８４６号公報(図１参照)Japanese Utility Model Publication No. 6-67846 (see FIG. 1)

上記従来技術では、次の問題が生じるおそれがある。
《問題》 各シリンダへのＥＧＲガス分配量が均等になりにくい。
ＥＧＲガス供給通路の単一のガス出口を吸気分配通路で開口させているため、ＥＧＲガスが吸気分配通路を通過する過程で、ＥＧＲガスの濃度分布が変化し、各シリンダの吸気ポートの位置毎に、各シリンダへのＥＧＲガス分配量が相違し、各シリンダへのＥＧＲガス分配量が均等になりにくい。この場合、各シリンダでの燃焼状態の差が大きくなり、運転の不調、排気ガスの悪化等の弊害が生じる。 In the above prior art, the following problems may occur.
<< Problem >> The EGR gas distribution amount to each cylinder is difficult to be equalized.
Since the single gas outlet of the EGR gas supply passage is opened by the intake distribution passage, the concentration distribution of the EGR gas changes in the process of passing the EGR gas through the intake distribution passage, and the intake port position of each cylinder changes. In addition, the EGR gas distribution amount to each cylinder is different, and the EGR gas distribution amount to each cylinder is not easily equalized. In this case, the difference in the combustion state between the cylinders becomes large, causing problems such as malfunction of the operation and deterioration of the exhaust gas.

本発明は、上記問題点を解決することができる多気筒エンジン、すなわち、各シリンダのＥＧＲガス分配量を均等にすることができる多気筒エンジン、を提供することを課題とする。   An object of the present invention is to provide a multi-cylinder engine that can solve the above-described problems, that is, a multi-cylinder engine that can equalize the EGR gas distribution amount of each cylinder.

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(Ａ)に例示するように、複数のシリンダ(１)(１)を備え、各シリンダ(１)毎にヘリカル吸気ポート(２)とストレート吸気ポート(３)とを設け、吸気(４)にＥＧＲガス(５)を添加するようにした、多気筒ディーゼルエンジンにおいて、
図１(Ｂ)(Ｃ)に例示するように、ＥＧＲガス分配通路(６)を設け、このＥＧＲガス分配通路(６)の複数のガス分配出口(７)を各ヘリカル吸気ポート(２)のポート入口(８)のみでそれぞれ開口させることにより、ＥＧＲガス(５)が各ヘリカル吸気ポート(２)には導入されるが、各ストレート吸気ポート(３)には導入されないようにした、ことを特徴とする、多気筒ディーゼルエンジン。 Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1A, a plurality of cylinders (1) and (1) are provided, and a helical intake port (2) and a straight intake port (3) are provided for each cylinder (1), and intake (4 In a multi-cylinder diesel engine in which EGR gas (5) is added to
As illustrated in FIGS. 1B and 1C, an EGR gas distribution passage (6) is provided, and a plurality of gas distribution outlets (7) of the EGR gas distribution passage (6) are connected to each helical intake port (2). By opening each port only at the port inlet (8), EGR gas (5) is introduced into each helical intake port (2) but not to each straight intake port (3). Features a multi-cylinder diesel engine.

（請求項１に係る発明）
《効果》 各シリンダへのＥＧＲガス分配量を均等にすることができる。
図１(Ｂ)(Ｃ)に例示するように、ＥＧＲガス分配通路(６)を設け、このＥＧＲガス分配通路(６)の複数のガス分配出口(７)を各ヘリカル吸気ポート(２)のポート入口(８)のみでそれぞれ開口させるので、各シリンダ(１)のヘリカル吸気ポート(２)の位置に拘わらず、各シリンダ(１)へのＥＧＲガス(５)の分配量を一致させやすく、各シリンダ(１)へのＥＧＲガス分配量を均等にすることができる。このため、各シリンダ(１)での燃焼状態の差が大きくなる不具合がなくなり、この不具合に起因する運転の不調、排気ガスの悪化等の弊害が生じにくい。 (Invention according to Claim 1)
<Effect> The EGR gas distribution amount to each cylinder can be made uniform.
As illustrated in FIGS. 1B and 1C, an EGR gas distribution passage (6) is provided, and a plurality of gas distribution outlets (7) of the EGR gas distribution passage (6) are connected to each helical intake port (2). Since each port is opened only at the port inlet (8), the distribution amount of the EGR gas (5) to each cylinder (1) can be easily matched regardless of the position of the helical intake port (2) of each cylinder (1). The EGR gas distribution amount to each cylinder (1) can be equalized. For this reason, the problem that the difference in the combustion state in each cylinder (1) becomes large is eliminated, and adverse effects such as malfunction of the operation and deterioration of the exhaust gas due to this problem are unlikely to occur.

《効果》 ＥＧＲガスと空気との混合が良好になる。
図１(Ｂ)(Ｃ)に例示するように、ＥＧＲガス(５)が各ヘリカル吸気ポート(２)には導入されるが、各ストレート吸気ポート(３)には導入されないため、ＥＧＲガス(５)の全てがスワール用の吸気(４)に添加され、スワール比が高まり、シリンダ(１)内でのＥＧＲガス(５)と空気との混合が良好になる。これにより、ＥＧＲガス添加時のスモークの発生を抑制することができ、ひいてはＥＧＲガスの還元率を高めて、窒素酸化物の低減機能を高めることができる。 <Effect> Mixing of EGR gas and air is improved.
As illustrated in FIGS. 1B and 1C, EGR gas (5) is introduced into each helical intake port (2), but is not introduced into each straight intake port (3). All of 5) is added to the swirl intake air (4), the swirl ratio is increased, and mixing of the EGR gas (5) and air in the cylinder (1) is improved. Thereby, generation | occurrence | production of the smoke at the time of EGR gas addition can be suppressed, and by extension, the reduction rate of EGR gas can be raised and the reduction function of nitrogen oxides can be raised.

（請求項２に係る発明）
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》 ＥＧＲガスと空気との混合が良好になる。
図１(Ｂ)に例示するように、各シリンダ(１)のヘリカル吸気ポート(２)のポート入口上部(８ａ)とポート入口下部(８ｂ)のうち、ポート入口上部(８ａ)に吸気分配出口(１５)を臨ませ、ポート入口下部(８ｂ)にガス分配出口(７)を臨ませたため、ヘリカル吸気ポート(２)の上部に比較的温度が低く比重の重い吸気(４)が流れ込み、ヘリカル吸気ポート(２)の下部に比較的温度が高く比重の軽いＥＧＲガス(５)が流れ込む。このため、ヘリカル吸気ポート(２)内で、比重の軽いＥＧＲガス(５)は浮上し、比重の重い吸気(４)は下降し、これらがヘリカル吸気ポート(２)内で予備的に混合され、シリンダ(１)内での空気とＥＧＲガス(５)との混合が良好になる。これにより、ＥＧＲガス添加時のスモークの発生を抑制することができ、ひいてはＥＧＲガスの還元率を高めて、窒素酸化物の低減機能を高めることができる。 (Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> Mixing of EGR gas and air is improved.
As illustrated in FIG. 1 (B), among the port inlet upper part (8 a) and the port inlet lower part (8 b) of the helical intake port (2) of each cylinder (1), the intake distribution outlet is located at the port inlet upper part (8 a). (15) is faced, and the gas distribution outlet (7) is faced to the port inlet lower part (8b), so that the intake air (4) having a relatively low temperature and heavy specific gravity flows into the upper part of the helical intake port (2), and the helical EGR gas (5) having a relatively high temperature and a low specific gravity flows into the lower portion of the intake port (2). For this reason, the light EGR gas (5) with a low specific gravity rises in the helical intake port (2), the intake with a high specific gravity (4) descends, and these are preliminarily mixed in the helical intake port (2). The mixing of the air and the EGR gas (5) in the cylinder (1) becomes good. Thereby, generation | occurrence | production of the smoke at the time of EGR gas addition can be suppressed, and by extension, the reduction rate of EGR gas can be raised and the reduction function of nitrogen oxides can be raised.

（請求項３に係る発明）
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》 ＥＧＲガス分岐通路を安価に製造することができる。
図２に例示するように、吸気分配手段(１１)の内部に通路区画壁(１３)を設け、この通路区画壁(１３)を、吸気分配手段(１１)の成型時に、吸気分配手段(１１)の外壁(１２)と一体成型で形成し、この通路区画壁(１３)で吸気分配通路(１４)とＥＧＲガス分配通路(６)とを区画したので、ＥＧＲガス分配通路(６)を吸気分配手段(１１)の成型時に同時に形成することができ、ＥＧＲガス分岐通路(６)を安価に製造することができる。 (Invention according to claim 3)
In addition to the effect of the invention according to claim 1 or claim 2, the following effect is achieved.
<Effect> The EGR gas branch passage can be manufactured at low cost.
As illustrated in FIG. 2, a passage partition wall (13) is provided inside the intake air distribution means (11), and this passage partition wall (13) is used when the intake air distribution means (11) is molded. ) And the outer partition wall (12), and the intake partition passage (14) and the EGR gas distribution passage (6) are partitioned by the passage partition wall (13), so that the EGR gas distribution passage (6) is taken into the intake air. It can be formed simultaneously with the molding of the distribution means (11), and the EGR gas branch passage (6) can be manufactured at low cost.

本発明の実施の形態を図面に基づいて説明する。図１から図３は本発明の実施形態に係る多気筒ディーゼルエンジンを説明する図で、この実施形態では、コモンレール噴射式で過給機付きの縦型水冷直列４気筒ディーゼルエンジンについて説明する。   Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 are diagrams for explaining a multi-cylinder diesel engine according to an embodiment of the present invention. In this embodiment, a vertical water-cooled in-line four-cylinder diesel engine with a common rail injection type and a supercharger will be described.

本発明の実施形態の概要は、次の通りである。
図３に示すように、シリンダブロックの上部にシリンダヘッド(９)を組み付け、シリンダヘッド(９)の上部にヘッドカバー(１６)を組み付けている。シリンダヘッド(９)の幅方向を横方向として、シリンダヘッド(９)の一方の横壁に排気合流手段(１７)を取り付け、他方の横壁(１０)に吸気分配手段(１１)を取り付けている。吸気分配手段(１１)とは、各シリンダ(１)に吸気を分配するための手段で、一般には、吸気マニホルドというが、この実施形態のものは、箱型で、分岐管を備えていないため、このような表現とした。また、排気合流手段(１７)は、各シリンダ(１)からの排気を合流させるための手段で、一般には、排気マニホルドというが、吸気分配手段(１１)という表現に合わせてこのような表現とした。燃料は、燃料サプライポンプ(２４)でコモンレール(２５)に供給され、コモンレール(２５)から高圧管(２６)を介して各シリンダ(１)のインジェクタ(２７)に供給される。 The outline of the embodiment of the present invention is as follows.
As shown in FIG. 3, the cylinder head (9) is assembled to the upper part of the cylinder block, and the head cover (16) is assembled to the upper part of the cylinder head (9). The exhaust merging means (17) is attached to one lateral wall of the cylinder head (9), and the intake air distributing means (11) is attached to the other lateral wall (10) with the width direction of the cylinder head (9) as the lateral direction. The intake air distribution means (11) is a means for distributing the intake air to each cylinder (1), and is generally called an intake manifold, but this embodiment is a box type and does not have a branch pipe. , With such an expression. The exhaust merging means (17) is a means for merging the exhaust from the cylinders (1), and is generally referred to as an exhaust manifold, but this expression is adapted to the expression of the intake air distributing means (11). did. The fuel is supplied to the common rail (25) by the fuel supply pump (24), and is supplied from the common rail (25) to the injector (27) of each cylinder (1) through the high-pressure pipe (26).

吸気装置の構成は、次の通りである。
図３に示すように、排気合流手段(１７)の出口には過給機(１８)が配置されている。この過給機(１８)から過給パイプ(図外)を介して吸気分配手段(１１)の入口に過給がなされる。このエンジンは、４本のシリンダ(１)(１)を備え、図１(Ａ)に示すように、シリンダ(１)毎にヘリカル吸気ポート(２)とストレート吸気ポート(３)とを設け、吸気(４)にＥＧＲガス(５)を添加するようになっている。図中の符号(４)はヘリカル吸気ポート(２)に導入される吸気、(２８)はストレート吸気ポート(３)に導入される吸気である。 The configuration of the intake device is as follows.
As shown in FIG. 3, a supercharger (18) is arranged at the outlet of the exhaust merging means (17). The supercharger (18) is supercharged to the inlet of the intake air distribution means (11) through a supercharge pipe (not shown). This engine includes four cylinders (1) and (1). As shown in FIG. 1 (A), a helical intake port (2) and a straight intake port (3) are provided for each cylinder (1). The EGR gas (5) is added to the intake air (4). Reference numeral (4) in the figure denotes intake air introduced into the helical intake port (2), and (28) denotes intake air introduced into the straight intake port (3).

ＥＧＲガス供給装置の構成は、次の通りである。
図３に示すように、排気合流手段(１７)の後部からＥＧＲガス出口通路(１９)を導出し、シリンダヘッド(９)の後方にＥＧＲガスクーラ(２０)を配置し、ＥＧＲガス出口通路(１９)を、ＥＧＲガスクーラ(２０)と逆止弁ケース(２１)とＥＧＲ弁ケース(２２)とを順に介して、吸気分配手段(１１)に設けた図２のＥＧＲガス分配通路(６)に連通させている。ＥＧＲガスクーラ(２０)は、ＥＧＲガスを冷却し、吸気の充填効率の低下を抑制するとともに、ＥＧＲ弁の熱損傷を抑制する。逆止弁ケース(２２)は、内部に逆止弁を収容し、この逆止弁は、過給圧が排気圧を越えた場合に閉弁し、ＥＧＲガス分配通路(６)からＥＧＲガスクーラ(２０)側にＥＧＲガスが逆流するのを防止する。ＥＧＲ弁ケース(２２)は、内部にＥＧＲ弁を収容している。このＥＧＲ弁は弁アクチュエータ(２３)に連動させ、弁アクチュエータ(２３)は制御手段(図外)に連携させている。制御手段は、マイクロコンピュータで、エンジン負荷やエンジン回転数等の運転状態に応じて、ＥＧＲ弁の開度を調節する。 The configuration of the EGR gas supply device is as follows.
As shown in FIG. 3, the EGR gas outlet passage (19) is led out from the rear part of the exhaust merging means (17), the EGR gas cooler (20) is arranged behind the cylinder head (9), and the EGR gas outlet passage (19 ) Communicated with the EGR gas distribution passage (6) of FIG. 2 provided in the intake distribution means (11) through the EGR gas cooler (20), the check valve case (21), and the EGR valve case (22) in this order. I am letting. The EGR gas cooler (20) cools the EGR gas, suppresses a decrease in intake charging efficiency, and suppresses thermal damage to the EGR valve. The check valve case (22) accommodates a check valve inside, and the check valve is closed when the supercharging pressure exceeds the exhaust pressure, and the EGR gas cooler (6) is connected to the EGR gas distribution passage (6). 20) Prevent EGR gas from flowing back to the side. The EGR valve case (22) accommodates an EGR valve therein. The EGR valve is linked to a valve actuator (23), and the valve actuator (23) is linked to control means (not shown). The control means is a microcomputer and adjusts the opening degree of the EGR valve in accordance with the operating state such as the engine load and the engine speed.

ＥＧＲガス供給装置の工夫は、次の通りである。
図１(Ａ)〜(Ｃ)に示すように、ＥＧＲガス分配通路(６)の複数のガス分配出口(７)を各ヘリカル吸気ポート(２)のポート入口(８)のみでそれぞれ開口させることにより、ＥＧＲガス(５)が各ヘリカル吸気ポート(２)には導入されるが、各ストレート吸気ポート(３)には導入されないようにしている。吸気分配手段(１１)の上部に吸気分配通路(１４)を配置し、吸気分配手段(１１)の下部にＥＧＲガス分配通路(６)を配置し、各シリンダ(１)のヘリカル吸気ポート(２)のポート入口上部(８ａ)とポート入口下部(８ｂ)のうち、ポート入口上部(８ａ)に吸気分配出口(１５)を臨ませ、ポート入口下部(８ｂ)にガス分配出口(７)を臨ませている。 The device of the EGR gas supply device is as follows.
As shown in FIGS. 1A to 1C, the plurality of gas distribution outlets (7) of the EGR gas distribution passage (6) are opened only at the port inlets (8) of the respective helical intake ports (2). Thus, the EGR gas (5) is introduced into each helical intake port (2) but is not introduced into each straight intake port (3). An intake distribution passage (14) is disposed above the intake distribution means (11), an EGR gas distribution passage (6) is disposed below the intake distribution means (11), and the helical intake port (2) of each cylinder (1) is disposed. ) Of the port inlet upper part (8a) and the port inlet lower part (8b), the port inlet upper part (8a) faces the intake distribution outlet (15), and the port inlet lower part (8b) faces the gas distribution outlet (7). Not.

吸気分配手段の構成は、次の通りである。
図１(Ａ)〜(Ｃ)に示すように、シリンダヘッド(９)の幅方向を横方向として、シリンダヘッド(９)の横壁(１０)に吸気分配手段(１１)を取り付け、この吸気分配手段(１１)の内部に通路区画壁(１３)を設け、この通路区画壁(１３)を、吸気分配手段(１１)の成型時に、吸気分配手段(１１)の外壁(１２)と一体成型で形成し、この通路区画壁(１３)で吸気分配通路(１４)とＥＧＲガス分配通路(６)とを区画している。この吸気分配手段(１１)は鋳造品である。 The configuration of the intake air distribution means is as follows.
As shown in FIGS. 1 (A) to 1 (C), the intake head distribution means (11) is attached to the horizontal wall (10) of the cylinder head (9) with the width direction of the cylinder head (9) as the horizontal direction. A passage partition wall (13) is provided inside the means (11), and the passage partition wall (13) is integrally formed with the outer wall (12) of the intake distribution means (11) when the intake distribution means (11) is molded. The intake partition passage (14) and the EGR gas distribution passage (6) are partitioned by the passage partition wall (13). The intake air distribution means (11) is a cast product.

本発明の実施形態に係るエンジンのシリンダヘッドの吸気分配手段を説明する図で、図１(Ａ)は横断平面図、図１(Ｂ)は図１(Ａ)のＢ−Ｂ線断面図、図１(Ｃ)は図１(Ａ)のＣ−Ｃ線断面図である。FIGS. 1A and 1B are cross-sectional plan views, FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A, and FIG. FIG. 1C is a cross-sectional view taken along the line CC of FIG. 図１(Ａ)のII−II線断面図である。It is the II-II sectional view taken on the line of FIG. 本発明の実施形態に係るエンジンの平面図である。1 is a plan view of an engine according to an embodiment of the present invention.

符号の説明Explanation of symbols

(１)‥シリンダ、(２)‥ヘリカル吸気ポート、(３)‥‥ストレート吸気ポート、(４)‥吸気、(５)‥ＥＧＲガス、(６)‥ＥＧＲガス分配通路、(７)‥ガス分配出口、(８)‥ポート入口、(８ａ)‥ポート入口上部、(８ｂ)‥ポート入口下部、(９)‥シリンダヘッド、(１０)‥横壁、(１１)‥吸気分配手段、(１２)‥外壁、(１３)‥通路区画壁、(１４)‥吸気分配通路、(１５)‥吸気分配出口。
(1) Cylinder, (2) Helical intake port, (3) Straight intake port, (4) Intake, (5) EGR gas, (6) EGR gas distribution passage, (7) Gas Distribution outlet, (8) ... Port inlet, (8a) ... Port inlet upper part, (8b) ... Port inlet lower part, (9) ... Cylinder head, (10) ... Side wall, (11) ... Intake distribution means, (12) ...... External wall, (13) Passage partition wall, (14) Intake distribution passage, (15) Intake distribution outlet.

Claims (3)

複数のシリンダ(１)(１)を備え、各シリンダ(１)毎にヘリカル吸気ポート(２)とストレート吸気ポート(３)とを設け、吸気(４)にＥＧＲガス(５)を添加するようにした、多気筒ディーゼルエンジンにおいて、
ＥＧＲガス分配通路(６)を設け、このＥＧＲガス分配通路(６)の複数のガス分配出口(７)を各ヘリカル吸気ポート(２)のポート入口(８)のみでそれぞれ開口させることにより、ＥＧＲガス(５)が各ヘリカル吸気ポート(２)には導入されるが、各ストレート吸気ポート(３)には導入されないようにした、ことを特徴とする、多気筒ディーゼルエンジン。 A plurality of cylinders (1) and (1) are provided, each cylinder (1) is provided with a helical intake port (2) and a straight intake port (3), and EGR gas (5) is added to the intake (4). In a multi-cylinder diesel engine,
By providing an EGR gas distribution passage (6) and opening a plurality of gas distribution outlets (7) of the EGR gas distribution passage (6) only at the port inlets (8) of the respective helical intake ports (2), EGR A multi-cylinder diesel engine characterized in that gas (5) is introduced into each helical intake port (2) but is not introduced into each straight intake port (3). 請求項１に記載した多気筒ディーゼルエンジンにおいて、
吸気分配手段(１１)の上部に吸気分配通路(１４)を配置し、吸気分配手段(１１)の下部にＥＧＲガス分配通路(６)を配置し、各シリンダ(１)のヘリカル吸気ポート(２)のポート入口上部(８ａ)とポート入口下部(８ｂ)のうち、ポート入口上部(８ａ)に吸気分配出口(１５)を臨ませ、ポート入口下部(８ｂ)にガス分配出口(７)を臨ませた、ことを特徴とする、多気筒ディーゼルエンジン。 The multi-cylinder diesel engine according to claim 1,
An intake distribution passage (14) is disposed above the intake distribution means (11), an EGR gas distribution passage (6) is disposed below the intake distribution means (11), and the helical intake port (2) of each cylinder (1) is disposed. ) Of the port inlet upper part (8a) and the port inlet lower part (8b), the port inlet upper part (8a) faces the intake distribution outlet (15), and the port inlet lower part (8b) faces the gas distribution outlet (7). A multi-cylinder diesel engine characterized by that. 請求項１または請求項２に記載した多気筒ディーゼルエンジンにおいて、
シリンダヘッド(９)の幅方向を横方向として、シリンダヘッド(９)の横壁(１０)に吸気分配手段(１１)を取り付け、この吸気分配手段(１１)の内部に通路区画壁(１３)を設け、この通路区画壁(１３)を、吸気分配手段(１１)の成型時に、吸気分配手段(１１)の外壁(１２)と一体成型で形成し、この通路区画壁(１３)で吸気分配通路(１４)とＥＧＲガス分配通路(６)とを区画した、ことを特徴とする多気筒ディーゼルエンジン。

The multi-cylinder diesel engine according to claim 1 or 2,
An intake distributing means (11) is attached to the horizontal wall (10) of the cylinder head (9) with the width direction of the cylinder head (9) as the horizontal direction, and a passage partition wall (13) is provided inside the intake distributing means (11). The passage partition wall (13) is formed integrally with the outer wall (12) of the intake distribution means (11) when the intake distribution means (11) is molded, and the intake distribution passage is formed by the passage partition wall (13). A multi-cylinder diesel engine characterized by partitioning (14) and an EGR gas distribution passage (6).

JP2005014964A 2005-01-24 2005-01-24 Multi-cylinder diesel engine Expired - Fee Related JP4431062B2 (en)

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