JP2010255485A - Exhaust gas recirculation device in internal combustion engine - Google Patents

Exhaust gas recirculation device in internal combustion engine Download PDF

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JP2010255485A
JP2010255485A JP2009105178A JP2009105178A JP2010255485A JP 2010255485 A JP2010255485 A JP 2010255485A JP 2009105178 A JP2009105178 A JP 2009105178A JP 2009105178 A JP2009105178 A JP 2009105178A JP 2010255485 A JP2010255485 A JP 2010255485A
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cylinder
exhaust gas
distribution passage
internal combustion
combustion engine
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JP5424698B2 (en
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Tomonori Moriuchi
智則 守内
Shigeji Mori
成示 森
Teruo Yamashita
輝朗 山下
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Daihatsu Motor Co Ltd
Toyota Motor Corp
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Daihatsu Motor Co Ltd
Toyota Motor 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To improve distribution performances of exhaust gas to each cylinder in an exhaust gas recirculation device in which an exhaust gas distribution passage 20 to each cylinder formed inside a spacer member 14 put between an intake manifold 8 and an intake side surface 3 of an internal combustion engine 1 comprises a main distribution passage 21 and branch distribution passages 22-25 to each cylinder from the main distribution passage, and an exhaust gas introduction part 26 from an exhaust system is disposed at an outside of a cylinder A4 positioned at the outermost position of the cylinders. <P>SOLUTION: Length of the branch distribution passages 22-25 at each cylinder is arranged in such a manner that it is longer at the cylinder A4 nearest to an exhaust gas discharge port out of the cylinders. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は，内燃機関において，その排気ガスのクリーン化等を図るために，排気ガスの一部を吸気系に還流するようにした排気還流装置に関するものである。   The present invention relates to an exhaust gas recirculation apparatus in an internal combustion engine that recirculates a part of exhaust gas to an intake system in order to clean the exhaust gas.

最近の内燃機関においては，その排気ガスのクリーン化等を図ることのために，排気ガスの一部を吸気系に還流することが行なわれており，この排気ガスの還流に際しては，排気ガスを，各気筒に等しく分配することが必要である。   In recent internal combustion engines, a part of the exhaust gas is recirculated to the intake system in order to clean the exhaust gas and the like. , It is necessary to distribute equally to each cylinder.

そこで，先行技術としての特許文献１，２は，
「内燃機関のうち各気筒への吸気ポートが開口する吸気側面と吸気マニホールドとの間に介挿したスペーサ部材の内部に，排気ガスを前記各気筒における吸気ポートに分配する排気ガス分配通路を形成し，この排気ガス分配通路を，前記各気筒の列方向に延びるメイン分配通路と，このメイン分配通路から前記各気筒の吸気ポートごとに分岐する枝分配通路にて構成し，前記各気筒のうち外側に位置する気筒より更に外側の部分に，排気系から前記メイン分配通路への排気ガス導入部を設けて成る排気ガス還流装置。」
を提案している。 Therefore, Patent Documents 1 and 2 as prior arts are as follows:
“An exhaust gas distribution passage for distributing exhaust gas to the intake ports in each cylinder is formed in the spacer member interposed between the intake side surface where the intake port to each cylinder of the internal combustion engine opens and the intake manifold. The exhaust gas distribution passage includes a main distribution passage extending in the column direction of the cylinders and a branch distribution passage branched from the main distribution passage for each intake port of the cylinders. An exhaust gas recirculation device in which an exhaust gas introduction portion from the exhaust system to the main distribution passage is provided in a portion further outside the cylinder located outside.
Has proposed.

特開２００４−１８３４８４号公報JP 2004-183484 A 特開２００４−２７０５８８号公報JP 2004-270588 A

しかし，この先行技術において，各気筒に対する枝分配通路を，各気筒について略同じ口径で，且つ，略同じ長さに構成していることにより，各気筒のうち排気ガス導入部に最も近い気筒では，排気ガスの還流が，流れ抵抗が低いこと等によって他の気筒よりも過剰になるというように，各気筒に還流する排気ガス量にバラ付きが存在するという問題があった。   However, in this prior art, the branch distribution passage for each cylinder is configured to have substantially the same diameter and the same length for each cylinder. The exhaust gas recirculation becomes excessive as compared with other cylinders due to low flow resistance, and there is a problem in that the amount of exhaust gas recirculating to each cylinder varies.

また，前記先行技術においては，前記各気筒における吸気ポート内に存在する吸気脈動が，各気筒に対する枝分配通路を介してその上流のメイン分配通路にまで伝播し，これによって前記メイン分配通路内における排気ガスの流れが乱されるので，各気筒に還流する排気ガス量のバラ付きが一層に増大されるおそれが大きいという問題もあった。   Further, in the prior art, the intake pulsation existing in the intake port in each cylinder is propagated to the main distribution passage upstream thereof via the branch distribution passage for each cylinder, and thereby in the main distribution passage. Since the flow of exhaust gas is disturbed, there is also a problem that the variation in the amount of exhaust gas recirculated to each cylinder is likely to be further increased.

本発明は，これらの問題を解消することを技術的課題とするものである。   The present invention has a technical problem to solve these problems.

この技術的課題を達成するため請求項１は，
「内燃機関のうち各気筒への吸気ポートが開口する吸気側面と吸気マニホールドとの間に介挿したスペーサ部材の内部に，排気ガスを前記各気筒における吸気ポートに分配する排気ガス分配通路を形成し，この排気ガス分配通路を，前記各気筒の列方向に延びるメイン分配通路と，このメイン分配通路から前記各気筒の吸気ポートごとに分岐する枝分配通路にて構成し，前記各気筒のうち外側に位置する気筒より更に外側の部分に，排気系から前記メイン分配通路への排気ガス導入部を設けて成る排気ガス還流装置において，
前記各気筒における枝分配通路の長さは，前記各気筒の排気ガス導入口に最も近い気筒において他の気筒よりも長く構成されている。」
ことを特徴としている。 In order to achieve this technical problem, claim 1
“An exhaust gas distribution passage for distributing exhaust gas to the intake ports in each cylinder is formed in the spacer member interposed between the intake side surface where the intake port to each cylinder of the internal combustion engine opens and the intake manifold. The exhaust gas distribution passage includes a main distribution passage extending in the column direction of the cylinders and a branch distribution passage branched from the main distribution passage for each intake port of the cylinders. In an exhaust gas recirculation device in which an exhaust gas introduction portion from an exhaust system to the main distribution passage is provided in a portion further outside the cylinder located outside,
The length of the branch distribution passage in each cylinder is configured to be longer in the cylinder closest to the exhaust gas inlet of each cylinder than in the other cylinders. "
It is characterized by that.

また，請求項２は，
「前記請求項１の記載において，前記枝分配通路は，Ｌ字状に屈曲した形状である。」
ことを特徴としている。 Claim 2
“In the description of claim 1, the branch distribution passage has an L-shaped bent shape.”
It is characterized by that.

更にまた，請求項３は，
「前記請求項１又は２の記載において，前記各気筒のうち前記排気ガス導入口に最も近い気筒における枝分配通路は，前記排気ガス導入部に最も近い気筒と，これに隣接する気筒との間に設けられている。」
ことを特徴としている。 Furthermore, claim 3
“In the first or second aspect of the present invention, the branch distribution passage in the cylinder closest to the exhaust gas inlet among the cylinders is between the cylinder closest to the exhaust gas inlet and the cylinder adjacent thereto. Is provided. "
It is characterized by that.

請求項１によると，各気筒の枝分配通路における長さが，排気ガス導入部に最も近い気筒において他の気筒よりも長いことにより，当該枝分配通路における流れ抵抗が，他の気筒における枝分配通路よりも大きくなるから，各気筒のうち排気ガス導入部に最も近い気筒に対する排気ガスの過剰還流を確実に抑制できて，各気筒への排気ガスの分配性を向上できる。   According to claim 1, since the length of the branch distribution passage of each cylinder is longer than that of the other cylinders in the cylinder closest to the exhaust gas introduction portion, the flow resistance in the branch distribution passage is reduced in the branch distribution in the other cylinders. Since it becomes larger than the passage, excessive recirculation of exhaust gas to the cylinder closest to the exhaust gas introduction portion among the cylinders can be reliably suppressed, and the distribution of exhaust gas to each cylinder can be improved.

請求項２によると，各気筒の枝分配通路をＬ字状に屈曲したことにより，各気筒の吸気ポートにおける吸気脈動のメイン分配通路への伝播を減衰することができるから，前記メイン分配通路における排気ガスの流れが吸気脈動にて乱されることを少なくでき，各気筒への排気ガスの分配性を確保できる。   According to claim 2, since the branch distribution passage of each cylinder is bent in an L shape, the propagation of intake pulsation in the intake port of each cylinder to the main distribution passage can be attenuated. It is possible to reduce the disturbance of the exhaust gas flow due to the intake pulsation, and to ensure the distribution of the exhaust gas to each cylinder.

請求項３によると，各気筒のうち排気ガス導入部に最も近い気筒における枝分配通路は，前記排気ガス導入部からより離れる（遠ざかる）ことになって，排気ガスの過剰還流をより抑制できるから，前記分配性の向上を助長できる。   According to the third aspect of the present invention, the branch distribution passage in the cylinder closest to the exhaust gas introduction portion among the cylinders is further away (away from) the exhaust gas introduction portion, so that excessive exhaust gas recirculation can be further suppressed. , Can improve the distribution.

内燃機関の要部を示す平面図である。It is a top view which shows the principal part of an internal combustion engine. 図１のII−II視拡大断面図である。FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. 図１のIII −III 視拡大断面図である。FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 1. 図１のIV−IV視拡大断面図である。FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1.

以下，本発明の実施の形態を，図１〜図４の図面について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

これらの図において，符号１は，内燃機関を示し，この内燃機関１は，クランク軸線２に沿って複数の気筒，つまり第１気筒Ａ１，第２気筒Ａ２，第３気筒Ａ３及び第４気筒Ａ４を備えている。   In these drawings, reference numeral 1 denotes an internal combustion engine. The internal combustion engine 1 has a plurality of cylinders along a crank axis 2, that is, a first cylinder A1, a second cylinder A2, a third cylinder A3, and a fourth cylinder A4. It has.

この内燃機関１において，前記クランク軸線２の方向に延びる一つの側面（吸気側面）３には，前記各気筒Ａ１〜Ａ４における吸気ポート４，５，６，７が開口している。   In the internal combustion engine 1, intake ports 4, 5, 6, and 7 in the cylinders A <b> 1 to A <b> 4 are opened on one side surface (intake side surface) 3 that extends in the direction of the crank axis 2.

符号８は，図示しないエアクリーナからの吸気を前記内燃機関１における各気筒Ａ１〜Ａ４に分配するための吸気マニホールドを示し，この吸気マニホールド８は，前記内燃機関１のうち各気筒Ａ１〜Ａ４における吸気ポート４〜７が開口する一つの側面（吸気側面）３に対して，複数本のボルト９の締結にて取付けられており，この吸気マニホールド８における各吸気管１０，１１，１２，１３が，前記各気筒Ａ１〜Ａ４における吸気ポート４，５，６，７の各々に連通している。   Reference numeral 8 denotes an intake manifold for distributing intake air from an air cleaner (not shown) to each of the cylinders A1 to A4 in the internal combustion engine 1. A plurality of bolts 9 are attached to one side surface (intake side surface) 3 where the ports 4 to 7 are opened, and the intake pipes 10, 11, 12, 13 in the intake manifold 8 are The cylinders A1 to A4 communicate with the intake ports 4, 5, 6, and 7, respectively.

前記内燃機関１における一つの側面３と，これに複数本のボルト９にて締結される吸気マニホールド８との間には，アルミニウム等の軽合金製のスペーサ部材１４が介挿されている。   A spacer member 14 made of a light alloy such as aluminum is interposed between one side face 3 of the internal combustion engine 1 and an intake manifold 8 fastened to the side face 3 by a plurality of bolts 9.

このスペーサ部材１４は，第１スぺーサ板１５ａと第２スペーサ板１５ｂとの二枚重ねに構成されており，このスペーサ部材１４には，吸気マニホールド８における各吸気管１０〜１３と各気筒Ａ１〜Ａ４の吸気ポート４〜７との各々を連通するための連通孔１６，１７，１８，１９が穿設されている。   The spacer member 14 is constituted by two sheets of a first spacer plate 15a and a second spacer plate 15b. The spacer member 14 includes the intake pipes 10 to 13 and the cylinders A1 to A1 in the intake manifold 8. Communication holes 16, 17, 18, and 19 are provided for communicating each of the A4 intake ports 4 to 7.

前記スペーサ部材１４のうち第１スペーサ板１５ａと第２スペーサ板１５ｂとの合わせ面には，排気ガスを各気筒Ａ１〜Ａ４に分配するための排気ガス分配通路２０が，前記クランク軸線２の方向，つまり，気筒列の方向に延びるように形成されている。   An exhaust gas distribution passage 20 for distributing exhaust gas to each of the cylinders A1 to A4 is provided on the mating surface of the first spacer plate 15a and the second spacer plate 15b of the spacer member 14 in the direction of the crank axis 2. That is, it is formed to extend in the direction of the cylinder row.

この排気ガス分配通路２０は，前記第１スペーサ板１５ａと第２スペーサ板１５ｂとの両方に跨がって凹み形成したメイン分配通路２１と，このメイン分配通路２１から前記各気筒Ａ１〜Ａ４ごとに分岐する枝分配通路２２，２３，２４，２５とによって構成されている。   The exhaust gas distribution passage 20 includes a main distribution passage 21 formed in a recess extending over both the first spacer plate 15a and the second spacer plate 15b, and the cylinders A1 to A4 from the main distribution passage 21. The branch distribution passages 22, 23, 24, and 25 are branched to each other.

前記排気ガス分配通路２０における各枝分配通路２２〜２５は，その先端が，該各枝分配通路２２〜２５の各々に対する連通孔１６〜１９に連通するという構成であり，これら各枝分配通路２２〜２５のうち第１気筒Ａ１に対する枝分配通路２２は直線状であるが，他の気筒，つまり，第２気筒Ａ２，第３気筒Ａ３及び第４気筒Ａ４に対する枝分配通路２３〜２５は，Ｌ字状に屈曲する形状に構成されている。   The branch distribution passages 22 to 25 in the exhaust gas distribution passage 20 are configured such that their tips communicate with the communication holes 16 to 19 corresponding to the branch distribution passages 22 to 25, respectively. To 25, the branch distribution passage 22 for the first cylinder A1 is linear, but the branch distribution passages 23 to 25 for the other cylinders, that is, the second cylinder A2, the third cylinder A3, and the fourth cylinder A4 are L It is configured to be bent in a letter shape.

また，これら各枝分配通路２２〜２５のうち，第４気筒Ａ４に対する枝分配通路２５は，第４気筒Ａ４における連通孔１９と第３気筒Ａ３における連通孔１８との間の部位に設けられ，第３気筒Ａ３に対する枝分配通路２４及び第２気筒Ａ２に対する枝分配通路２３は，第３気筒Ａ３における連通孔１８と第２気筒Ａ２における連通孔１７との間の部位に設けられ，そして，第１気筒Ａ１に対する枝分配通路２２は，第１気筒Ａ１における連通孔１６と第２気筒Ａ２における連通孔１７との間の部位に設けられている。   Of these branch distribution passages 22 to 25, the branch distribution passage 25 for the fourth cylinder A4 is provided at a portion between the communication hole 19 in the fourth cylinder A4 and the communication hole 18 in the third cylinder A3. The branch distribution passage 24 for the third cylinder A3 and the branch distribution passage 23 for the second cylinder A2 are provided at a portion between the communication hole 18 in the third cylinder A3 and the communication hole 17 in the second cylinder A2. The branch distribution passage 22 for one cylinder A1 is provided at a portion between the communication hole 16 in the first cylinder A1 and the communication hole 17 in the second cylinder A2.

更にまた，前記第４気筒Ａ４に対する枝分配通路２５の長さは，他の気筒Ａ１〜Ａ３に対する枝分配通路２２〜２４の長さよりも適宜寸法だけ長くするいう構成にしている。   Furthermore, the length of the branch distribution passage 25 for the fourth cylinder A4 is set to be appropriately longer than the length of the branch distribution passages 22 to 24 for the other cylinders A1 to A3.

一方，前記排気ガス分配通路２０におけるメイン分配通路２１は，前記各気筒Ａ１〜Ａ４のうち外側に位置する第４気筒Ａ４より更に外側の部分に，当該メイン分配通路２１への排気ガス導入部２６を備えて，この排気ガス導入部２６に，前記内燃機関１における排気系からの排気ガス還流管路２７が接続されている。   On the other hand, the main distribution passage 21 in the exhaust gas distribution passage 20 has an exhaust gas introduction portion 26 to the main distribution passage 21 at a portion further outside the fourth cylinder A4 located outside the cylinders A1 to A4. The exhaust gas recirculation pipe 27 from the exhaust system in the internal combustion engine 1 is connected to the exhaust gas introduction portion 26.

なお，前記スペーサ部材１４と，前記内燃機関１の側面３及び前記吸気マニホールド８との間の各々には，シール用ガスケット２８，２９が設けられており，このスペーサ部材１４における第１スペーサ板１５ａと第２スペーサ板１５ｂとの間にもシール用ガスケット３０が設けられている。   Sealing gaskets 28 and 29 are provided between the spacer member 14 and the side surface 3 of the internal combustion engine 1 and the intake manifold 8, and the first spacer plate 15a in the spacer member 14 is provided. A sealing gasket 30 is also provided between the first spacer plate 15b and the second spacer plate 15b.

この構成において，内燃機関１における排気系からの還流排気ガスは，排気ガス還流管路２７を通って排気ガス分配通路２０におけるメイン分配通路２１に，その一端の排気ガス導入部２６から入り，このメイン分配通路２１から各枝分配通路２２〜２５を介して各気筒Ａ１〜Ａ４に分配される。   In this configuration, the recirculated exhaust gas from the exhaust system in the internal combustion engine 1 enters the main distribution passage 21 in the exhaust gas distribution passage 20 through the exhaust gas recirculation pipe 27 from the exhaust gas introduction portion 26 at one end thereof. The main distribution passage 21 is distributed to the cylinders A1 to A4 through the branch distribution passages 22 to 25.

この場合において，各気筒Ａ１〜Ａ４のうち第４気筒Ａ４は，前記排気ガス分配通路２０への排気ガス導入部２６に最も近いことにより，この第４気筒Ａ４への排気ガスの還流が，他の気筒Ａ１〜Ａ３よりも過剰になる。   In this case, among the cylinders A1 to A4, the fourth cylinder A4 is closest to the exhaust gas introduction part 26 to the exhaust gas distribution passage 20, and therefore the recirculation of the exhaust gas to the fourth cylinder A4 is the other. More than the cylinders A1 to A3.

そこで，本発明においては，前記したように，前記第４気筒Ａ４に対する枝分配通路２５の長さを，他の気筒Ａ１〜Ａ３に対する枝分配通路２２〜２４の長さよりも適宜寸法だけ長くするという構成にしている。   Therefore, in the present invention, as described above, the length of the branch distribution passage 25 for the fourth cylinder A4 is made to be appropriately longer than the length of the branch distribution passages 22 to 24 for the other cylinders A1 to A3. It has a configuration.

これにより，当該第４気筒Ａ４に対する枝分配通路２５における流れ抵抗が，他の気筒Ａ１〜Ａ３における枝分配通路２２〜２４よりも大きくなるから，前記第４気筒Ａ４に対する排気ガスの過剰還流を確実に抑制することができる。   As a result, the flow resistance in the branch distribution passage 25 for the fourth cylinder A4 is greater than that in the branch distribution passages 22 to 24 in the other cylinders A1 to A3, so that excessive exhaust gas recirculation to the fourth cylinder A4 is ensured. Can be suppressed.

また，本発明は，前記第４気筒Ａ４に対する枝分配通路２５を，前記第４気筒Ａ４とこれに隣接する第３気筒Ａ３との間に設けるという構成にしたもので，これにより，前記第４気筒Ａ４に対する枝分配通路２５は，前記排気ガス導入部２６からより離れる（遠ざかる）ことになって，排気ガスの過剰還流をより抑制できる。   In the present invention, the branch distribution passage 25 for the fourth cylinder A4 is provided between the fourth cylinder A4 and the third cylinder A3 adjacent thereto, whereby the fourth cylinder A4 is provided. The branch distribution passage 25 with respect to the cylinder A4 is further away (away from) the exhaust gas introduction portion 26, so that excessive exhaust gas recirculation can be further suppressed.

特に，前記排気ガス分配通路２０における各枝分配通路２２，２３，２４，２５のうち，第２気筒Ａ２，第３気筒Ａ３及び第４気筒Ａ４に対する枝分配通路２３〜２５の各々を，Ｌ字状に屈曲するいう構成にしたことにより，各気筒Ａ２〜Ａ４の吸気ポート５〜７における吸気脈動の上流側への伝播を，Ｌ字状の屈曲にて減衰することができるから，前記各吸気ポート５〜７における新規吸気の排気系への逆流を抑制できる。   In particular, among the branch distribution passages 22, 23, 24, and 25 in the exhaust gas distribution passage 20, each of the branch distribution passages 23 to 25 for the second cylinder A2, the third cylinder A3, and the fourth cylinder A4 is L-shaped. By being configured to be bent in a shape, the propagation of the intake pulsation upstream of the intake ports 5 to 7 of each cylinder A2 to A4 can be attenuated by the L-shaped bend. Backflow of new intake air to the exhaust system at ports 5 to 7 can be suppressed.

ところで，前記排気ガス導入部２６から最も遠い第１気筒Ａ１に対する枝分配通路２２は，Ｌ字状の屈曲した構成ではなく，直線状に構成することにより，前記第１気筒Ａ１への還流排気ガスの流れ抵抗を小さくして，第１気筒Ａ１に対する排気ガスの還流に不足が発生しないようにしている。   By the way, the branch distribution passage 22 for the first cylinder A1 farthest from the exhaust gas introduction portion 26 is not configured to be bent in an L shape, but is configured in a straight line, whereby the recirculated exhaust gas to the first cylinder A1 is formed. The flow resistance is reduced so that there is no shortage in the exhaust gas recirculation to the first cylinder A1.

また，前記第１気筒Ａ１に対する枝分配通路２２は，メイン分配通路２１の終端に接続されていることにより，前記第１気筒Ａ１に対する枝分配通路２２において吸気の逆流が発生しても，この吸気逆流が他の気筒に対する排気ガスの分配に悪影響を及ぼすことを僅少にとどめることができる。   Further, the branch distribution passage 22 for the first cylinder A1 is connected to the end of the main distribution passage 21, so that even if a reverse flow of intake air occurs in the branch distribution passage 22 for the first cylinder A1, It is possible to minimize the adverse effect of the reverse flow on the distribution of exhaust gas to the other cylinders.

１ 内燃機関
２ クランク軸線
Ａ１〜Ａ４ 気筒
３ 吸気側面
４〜７ 吸気ポート
８ 吸気マニホールド
１０〜１３ 吸気管
１４ スペーサ部材
１５ａ，１５ｂ スペーサ板
１６〜１９ 連通孔
２０ 排気ガス分配通路
２１ メイン分配通路
２２〜２５ 枝分配通路
２６ 排気ガス導入部 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Crank axis A1-A4 Cylinder 3 Intake side surface 4-7 Intake port 8 Intake manifold 10-13 Intake pipe 14 Spacer member 15a, 15b Spacer plate 16-19 Communication hole 20 Exhaust gas distribution path 21 Main distribution path 22- 25 Branch distribution passage 26 Exhaust gas introduction part

Claims (3)

内燃機関のうち各気筒への吸気ポートが開口する吸気側面と吸気マニホールドとの間に介挿したスペーサ部材の内部に，排気ガスを前記各気筒における吸気ポートに分配する排気ガス分配通路を形成し，この排気ガス分配通路を，前記各気筒の列方向に延びるメイン分配通路と，このメイン分配通路から前記各気筒の吸気ポートごとに分岐する枝分配通路にて構成し，前記各気筒のうち外側に位置する気筒より更に外側の部分に，排気系から前記メイン分配通路への排気ガス導入部を設けて成る排気ガス還流装置において，
前記各気筒における枝分配通路の長さは，前記各気筒の排気ガス導入口に最も近い気筒において他の気筒よりも長く構成されていることを特徴とする内燃機関における排気ガス還流装置。 An exhaust gas distribution passage for distributing exhaust gas to the intake port in each cylinder is formed in the spacer member interposed between the intake side surface where the intake port to each cylinder of the internal combustion engine opens and the intake manifold. The exhaust gas distribution passage is composed of a main distribution passage extending in the column direction of each cylinder and a branch distribution passage branched from the main distribution passage for each intake port of each cylinder. In an exhaust gas recirculation device comprising an exhaust gas introduction portion from the exhaust system to the main distribution passage in a portion further outside the cylinder located at
An exhaust gas recirculation device in an internal combustion engine, wherein a length of a branch distribution passage in each cylinder is configured to be longer in a cylinder closest to an exhaust gas introduction port of each cylinder than in other cylinders. 前記請求項１の記載において，前記枝分配通路は，Ｌ字状に屈曲した形状であることを特徴とする内燃機関における排気ガス還流装置。   2. The exhaust gas recirculation device in an internal combustion engine according to claim 1, wherein the branch distribution passage has an L-shaped bent shape. 前記請求項１又は２の記載において，前記各気筒のうち前記排気ガス導入口に最も近い気筒における枝分配通路は，前記排気ガス導入部に最も近い気筒と，これに隣接する気筒との間に設けられていることを特徴とする内燃機関における排気ガス還流装置。   The branch distribution passage in the cylinder closest to the exhaust gas introduction port among the cylinders is defined between the cylinder closest to the exhaust gas introduction portion and a cylinder adjacent thereto. An exhaust gas recirculation device for an internal combustion engine, comprising:
JP2009105178A 2009-04-23 2009-04-23 Exhaust gas recirculation device in internal combustion engine Expired - Fee Related JP5424698B2 (en)

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