JP2019148205A - Reflux exhaust gas introduction structure of intake manifold - Google Patents

Reflux exhaust gas introduction structure of intake manifold Download PDF

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JP2019148205A
JP2019148205A JP2018032698A JP2018032698A JP2019148205A JP 2019148205 A JP2019148205 A JP 2019148205A JP 2018032698 A JP2018032698 A JP 2018032698A JP 2018032698 A JP2018032698 A JP 2018032698A JP 2019148205 A JP2019148205 A JP 2019148205A
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exhaust gas
gas introduction
intake
throttle valve
introduction pipe
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JP7058911B2 (en
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美幸 西口
Yoshiyuki Nishiguchi
美幸 西口
前田　直紀
Naoki Maeda
直紀 前田
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Daihatsu Motor Co Ltd
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Abstract

To provide a reflux exhaust gas introduction structure of an intake manifold which improves the distribution accuracy to cylinders, and can suppress the accumulation of deposits to a throttle valve at the blowback of intake air.SOLUTION: In a reflux exhaust gas introduction structure of an intake manifold, a surge tank 5 is arranged at a downstream side of a throttle valve 7, connected with intake branch pipes 3a, 3b and 3c of a plurality of cylinders, and distributes intake air introduced via the throttle valve 7 to the plurality of intake branch pipes. An exhaust gas introduction pipe 9 for discharging a reflux exhaust gas is protrusively inserted into the surge tank. The exhaust gas introduction pipe 9 has at least one of discharge ports 11a, 11b and 11c, and at least one discharge port of the exhaust gas introduction pipe 9 is arranged while opposing at least one of the intake branch pipes of the plurality of the cylinders.SELECTED DRAWING: Figure 1

Description

本発明は、自動車用等のエンジンから排出された排気ガスの一部を吸気側に還流されるＥＧＲ（Ｅｘｈａｕｓｔ Ｇａｓ Ｒｅｃｉｒｃｕｌａｔｉｏｎ）装置において、ＥＧＲ通路からの還流排気ガス（ＥＧＲガス）をインテークマニホールドに導入する、インテークマニホールドの還流排気ガス導入構造に関する。   The present invention introduces recirculated exhaust gas (EGR gas) from an EGR passage into an intake manifold in an EGR (Exhaust Gas Recirculation) device that recirculates part of exhaust gas discharged from an engine for automobiles or the like to the intake side. The present invention relates to a return exhaust gas introduction structure for an intake manifold.

従来、ＥＧＲガスを還流させるため、サージタンク内に排ガス導入パイプを挿入し、各気筒への分配改善や、樹脂製のサージタンクやインテークマニホールドへの熱害を防止する技術が提案されている（例えば、特許文献１、２参照）。これらの技術は、排ガス導入パイプを、スロットルバルブの上流側に設けたサージタンクの脹らみ部に開口させて、スロットルバルブからの吸気の流れに乗せて、各気筒の分岐管への分配を改善させたり、インテークマニホールドのシリンダヘッド接合面に開口するＥＧＲガス還流口に排ガス導入パイプを接続することで、高温ＥＧＲガスによる熱害を防止するものである。これらの技術は、いずれも、サージタンクの空間内に排ガス導入パイプが開口され、各分岐管に吸入される吸気の流れに混合されてＥＧＲガスが吸入される。そのため、各気筒への分配はある程度均一化されるが、その精度にはおのずと限界がある。また、スロットルバルブへの吸気吹き返しにより、デポジットが堆積する懸念がある。   Conventionally, in order to recirculate EGR gas, a technique has been proposed in which an exhaust gas introduction pipe is inserted into a surge tank to improve distribution to each cylinder and to prevent thermal damage to a plastic surge tank or intake manifold ( For example, see Patent Documents 1 and 2). In these technologies, the exhaust gas introduction pipe is opened in the swell portion of the surge tank provided on the upstream side of the throttle valve, and is placed on the flow of intake air from the throttle valve to distribute to the branch pipes of each cylinder. By improving or by connecting an exhaust gas introduction pipe to the EGR gas recirculation port that opens to the cylinder head joint surface of the intake manifold, heat damage due to high temperature EGR gas is prevented. In any of these techniques, an exhaust gas introduction pipe is opened in the space of the surge tank, and EGR gas is sucked by being mixed with the flow of intake air sucked into each branch pipe. Therefore, the distribution to each cylinder is made uniform to some extent, but the accuracy is naturally limited. Moreover, there is a concern that deposits may accumulate due to the return of intake air to the throttle valve.

特開２０１１−１１１９８１号公報JP2011-111981 特開２００１−２６３１８３号公報JP 2001-263183 A

図３に、従来のインテークマニホールド内の構造を概略的に示した断面図を示す。同図においては、吸気の流れを実線で、還流排気ガスの流れを破線で示している。インテークマニホールド１は、エンジン（図示せず）に接続される複数の気筒の吸気分岐管３ａ、３ｂ、３ｃが接続されており、その上部にはサージタンク５が設けられている。サージタンク５は、スロットルバルブ７の下流に設けられており、スロットルバルブ７を経て導入した吸気を、複数の気筒に分配する。サージタンク５には、排ガス導入パイプ１９から、還流排気ガスが直接戻される構造となっており、吸気と還流排気ガスとの各吸気分岐管への均等分配は困難であった。   FIG. 3 is a cross-sectional view schematically showing a structure in a conventional intake manifold. In the figure, the flow of intake air is indicated by a solid line, and the flow of recirculated exhaust gas is indicated by a broken line. The intake manifold 1 is connected to intake branch pipes 3a, 3b, and 3c of a plurality of cylinders connected to an engine (not shown), and a surge tank 5 is provided on the upper part thereof. The surge tank 5 is provided downstream of the throttle valve 7 and distributes the intake air introduced through the throttle valve 7 to a plurality of cylinders. The surge tank 5 has a structure in which the recirculated exhaust gas is directly returned from the exhaust gas introduction pipe 19, and it is difficult to evenly distribute the intake air and the recirculated exhaust gas to the intake branch pipes.

本発明は上記問題点を解決するものであり、各気筒への分配精度を向上させるとともに、吸気吹き返し時のスロットルバルブへのデポジット堆積を抑制することが可能な、インテークマニホールドの還流排気ガス導入構造を提供することを目的とする。   The present invention solves the above-mentioned problems, and improves the distribution accuracy to each cylinder and suppresses the accumulation of deposits on the throttle valve when the intake air is blown back. The purpose is to provide.

上記目的を達成するために、本発明のインテークマニホールドの還流排気ガス導入構造は、
スロットルバルブ下流に設けられ、複数の気筒の吸気分岐管が接続されており、前記スロットルバルブを経て導入した吸気を、前記複数の気筒に分配するサージタンク内に、
還流排気ガスを吐出する排ガス導入パイプが突出して挿入され、
前記排ガス導入パイプは、少なくとも一つの吐出口を有しており、
前記排ガス導入パイプの少なくとも一つの吐出口が、前記複数の気筒の吸気分岐管の少なくとも一つに向けて対向して配置されることを特徴とする。 In order to achieve the above object, the return exhaust gas introduction structure of the intake manifold of the present invention comprises:
Provided downstream of the throttle valve, and connected to intake branch pipes of a plurality of cylinders, and in a surge tank that distributes the intake air introduced through the throttle valve to the plurality of cylinders,
An exhaust gas introduction pipe for discharging the recirculated exhaust gas is inserted protrudingly,
The exhaust gas introduction pipe has at least one discharge port,
At least one discharge port of the exhaust gas introduction pipe is disposed to face at least one of the intake branch pipes of the plurality of cylinders.

本発明のインテークマニホールドの還流排気ガス導入構造によれば、各気筒への分配精度を向上させるとともに、吸気吹き返し時のスロットルバルブへのデポジット堆積を抑制することが可能な、インテークマニホールドの還流排気ガス導入構造を提供することができる。   According to the intake manifold recirculation exhaust gas introduction structure of the present invention, the recirculation exhaust gas of the intake manifold can improve the distribution accuracy to each cylinder and can suppress the deposit accumulation on the throttle valve when the intake air blows back. An introduction structure can be provided.

この発明の上述の目的，その他の目的，特徴および利点は、図面を参照して行う以下の実施例の詳細な説明から一層明らかとなろう。   The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

図１は、本発明の第１の実施形態に係るインテークマニホールド内の構造を概略的に示した断面図である。FIG. 1 is a cross-sectional view schematically showing a structure in an intake manifold according to the first embodiment of the present invention. 図２は、本発明の第２の実施形態に係るインテークマニホールド内の構造を概略的に示した断面図である。FIG. 2 is a cross-sectional view schematically showing the structure in the intake manifold according to the second embodiment of the present invention. 図３は、従来のインテークマニホールド内の構造を概略的に示した断面図である。FIG. 3 is a cross-sectional view schematically showing a structure in a conventional intake manifold.

以下、この発明の実施の形態を、図面を参照しながら説明する。ただし、本発明は、以下の例に限定および制限されない。なお、以下で参照する図面は、模式的に記載されたものであり、図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited or limited to the following examples. The drawings referred to below are schematically described, and the ratio of the dimensions of objects drawn in the drawings may be different from the ratio of dimensions of actual objects. The dimensional ratio of the object may be different between the drawings.

（第１の実施形態）
図１は、本発明の第１の実施形態に係るインテークマニホールド１内の構造を概略的に示した断面図である。同図においては、吸気の流れを実線で、還流排気ガスの流れを破線で示している。なお、同図においては、３気筒の態様を例示しているが、本発明はこれに限定されるものではない。 (First embodiment)
FIG. 1 is a cross-sectional view schematically showing the structure in the intake manifold 1 according to the first embodiment of the present invention. In the figure, the flow of intake air is indicated by a solid line, and the flow of recirculated exhaust gas is indicated by a broken line. In addition, in the same figure, although the aspect of 3 cylinders is illustrated, this invention is not limited to this.

インテークマニホールド１は、エンジン（図示せず）に接続される複数の気筒の吸気分岐管３ａ、３ｂ、３ｃが接続されている。本実施形態では、気筒の吸気分岐管３ａ、３ｂ、３ｃは、並列に並んで配置されているが、これに限定されるものではない。各吸気分岐管３ａ、３ｂ、３ｃの上部にはサージタンク５が設けられている。サージタンク５は、スロットルバルブ７の下流に設けられており、スロットルバルブ７を経て導入した吸気を、複数の気筒に分配する。サージタンク５内には、排ガス導入パイプ９が突出して挿入されている。排ガス導入パイプ９は、少なくとも一つの吐出口を有しており、サージタンク５内に、還流排気ガスを吐出する。本実施形態においては、排ガス導入パイプ９には、複数の気筒の吸気分岐管（ポート開口部）３ａ、３ｂ、３ｃに対応して、３つの吐出口１１ａ、１１ｂ、１１ｃが、各吸気分岐管に対向して配置されている。   The intake manifold 1 is connected to intake branch pipes 3a, 3b, 3c of a plurality of cylinders connected to an engine (not shown). In the present embodiment, the intake branch pipes 3a, 3b, 3c of the cylinders are arranged in parallel, but the present invention is not limited to this. A surge tank 5 is provided above each intake branch pipe 3a, 3b, 3c. The surge tank 5 is provided downstream of the throttle valve 7 and distributes the intake air introduced through the throttle valve 7 to a plurality of cylinders. An exhaust gas introduction pipe 9 is protruded and inserted into the surge tank 5. The exhaust gas introduction pipe 9 has at least one discharge port, and discharges the recirculated exhaust gas into the surge tank 5. In the present embodiment, the exhaust gas introduction pipe 9 has three discharge ports 11a, 11b, 11c corresponding to the intake branch pipes (port openings) 3a, 3b, 3c of a plurality of cylinders. It is arranged to face.

このように、排ガス導入パイプ９の吐出口１１ａ、１１ｂ、１１ｃが吸気分岐管３ａ、３ｂ、３ｃに向けて開口することによって、各気筒の負圧に応じてそれぞれ均一な量の排気ガスが吸入され、吸気と還流排気ガスとの分配精度を向上させることができる。また、スロットルバルブ７の下流側の吸気分岐管３ａ、３ｂ、３ｃに向けて排ガス導入パイプ９の開口（吐出口）が設けられるので、吸気吹き返し時に、スロットルバルブ７へのデポジットの原因となる煤、未燃燃料成分、オイル成分等がスロットルバルブ７まで届きにくい。したがって、スロットルバルブ７へのデポジット堆積を抑制することも可能である。   In this way, when the discharge ports 11a, 11b, and 11c of the exhaust gas introduction pipe 9 are opened toward the intake branch pipes 3a, 3b, and 3c, a uniform amount of exhaust gas is sucked according to the negative pressure of each cylinder. Thus, the distribution accuracy between the intake air and the recirculated exhaust gas can be improved. Further, since the opening (discharge port) of the exhaust gas introduction pipe 9 is provided toward the intake branch pipes 3a, 3b, 3c on the downstream side of the throttle valve 7, it may cause a deposit to the throttle valve 7 when the intake air blows back. In addition, unburned fuel components, oil components, etc. are difficult to reach the throttle valve 7. Therefore, deposit accumulation on the throttle valve 7 can be suppressed.

なお、図１に示すように、スロットルバルブ７の搭載位置は、吸気分岐管の軸線方向に対して、オフセットしていることが好ましい。このような構造とすることで、耐デポジット性をより向上されることができる。   In addition, as shown in FIG. 1, it is preferable that the mounting position of the throttle valve 7 is offset with respect to the axial direction of the intake branch pipe. By setting it as such a structure, deposit resistance can be improved more.

また、各吸気分岐管に対向する吐出口の開口面積は、吸気と還流排気ガスとの分配精度を確認しながらマッチングしていることが好ましい。具体的には、他の吸気分岐管に比べて吸気の分配割合が多くなる吸気分岐管に対しては、対向する吐出口の開口面積を広くすればよい。前記開口面積を広くすることで、還流排気ガスの分配割合をより大きくなるようにして、他の吸気分岐管における分配割合との均一化を図ることができ、分配精度をさらに向上させることができる。   Moreover, it is preferable that the opening area of the discharge port facing each intake branch pipe is matched while confirming the distribution accuracy between the intake air and the recirculated exhaust gas. Specifically, the opening area of the opposed discharge ports may be widened for the intake branch pipe where the distribution ratio of the intake air is larger than other intake branch pipes. By widening the opening area, the distribution ratio of the recirculated exhaust gas can be increased, and the distribution ratio in the other intake branch pipes can be made uniform, and the distribution accuracy can be further improved. .

（第２の実施形態）
図２は、本発明の第２の実施形態に係るインテークマニホールド１内の構造を概略的に示した断面図である。同図においては、吸気の流れを実線で、還流排気ガスの流れを破線で示している。なお、同図においては、３気筒の態様を例示しているが、本発明はこれに限定されるものではない。 (Second Embodiment)
FIG. 2 is a cross-sectional view schematically showing a structure in the intake manifold 1 according to the second embodiment of the present invention. In the figure, the flow of intake air is indicated by a solid line, and the flow of recirculated exhaust gas is indicated by a broken line. In addition, in the same figure, although the aspect of 3 cylinders is illustrated, this invention is not limited to this.

本実施形態においては、排ガス導入パイプ９Ａの全長が、並列に並んだ吸気分岐管端部（３ｃの位置）までの距離に満たない長さに設定されている。排ガス導入パイプ長を短縮することで、排ガス導入パイプの強度確保を容易にし、コスト抑制を図ることができる。このような場合、少なくとも吸気分岐管に対向する部分については、排ガス導入パイプに対応する開口（吐出口）を設けることが好ましい。図２においては、排ガス導入パイプ９Ａの届く範囲にある吸気分岐管３ａに対しては、対向して配置される吐出口１１ｄを設けている。排ガス導入パイプ９Ａの先端部には、パイプ軸線方向に向けて開口（吐出口）１１ｅが設けられていればよい。このように、スロットルバルブ７に近い吸気分岐管のポート開口部に向けて、排ガス導入パイプ９Ａの開口（吐出口）１１ｄを設けることで分配精度を向上させ、スロットルバルブ７から遠い吸気分岐管のポート開口部への還流排気ガスの分配は、還流排気ガスをサージタンク５に返して行うことができる。本実施形態において、吸気と還流排気ガスとの分配は、吐出口の開口面積比やパイプ軸線方向の開口（１１ｅに相当する部分）の絞り形状（ノズル形状）の調整により、均一化を図ることができる。   In the present embodiment, the total length of the exhaust gas introduction pipe 9A is set to a length that is less than the distance to the end of the intake branch pipe (position 3c) arranged in parallel. By shortening the length of the exhaust gas introduction pipe, it is possible to easily secure the strength of the exhaust gas introduction pipe and reduce the cost. In such a case, it is preferable to provide an opening (discharge port) corresponding to the exhaust gas introduction pipe at least at a portion facing the intake branch pipe. In FIG. 2, a discharge port 11d that is disposed to face the intake branch pipe 3a that is within the reach of the exhaust gas introduction pipe 9A is provided. An opening (discharge port) 11e may be provided at the tip of the exhaust gas introduction pipe 9A in the pipe axial direction. Thus, by providing the opening (discharge port) 11d of the exhaust gas introduction pipe 9A toward the port opening of the intake branch pipe close to the throttle valve 7, distribution accuracy is improved, and the intake branch pipe far from the throttle valve 7 is improved. Distribution of the recirculated exhaust gas to the port opening can be performed by returning the recirculated exhaust gas to the surge tank 5. In the present embodiment, the distribution of the intake air and the recirculated exhaust gas is made uniform by adjusting the opening area ratio of the discharge ports and the throttle shape (nozzle shape) of the opening in the pipe axis direction (portion corresponding to 11e). Can do.

１ …インテークマニホールド
３ａ、３ｂ、３ｃ…吸気分岐管
５ …サージタンク
７ …スロットルバルブ
９、９Ａ、１９ …排ガス導入パイプ
１１ａ、１１ｂ、１１ｃ、１１ｄ、１１ｅ…吐出口 DESCRIPTION OF SYMBOLS 1 ... Intake manifold 3a, 3b, 3c ... Intake branch pipe 5 ... Surge tank 7 ... Throttle valve 9, 9A, 19 ... Exhaust gas introduction pipe 11a, 11b, 11c, 11d, 11e ... Discharge port

Claims (1)

スロットルバルブ下流に設けられ、複数の気筒の吸気分岐管が接続されており、前記スロットルバルブを経て導入した吸気を、前記複数の気筒に分配するサージタンク内に、
還流排気ガスを吐出する排ガス導入パイプが突出して挿入され、
前記排ガス導入パイプは、少なくとも一つの吐出口を有しており、
前記排ガス導入パイプの少なくとも一つの吐出口が、前記複数の気筒の吸気分岐管の少なくとも一つに向けて対向して配置されることを特徴とするインテークマニホールドの還流排気ガス導入構造。

Provided downstream of the throttle valve, and connected to intake branch pipes of a plurality of cylinders, and in a surge tank that distributes the intake air introduced through the throttle valve to the plurality of cylinders,
An exhaust gas introduction pipe for discharging the recirculated exhaust gas is inserted protrudingly,
The exhaust gas introduction pipe has at least one discharge port,
At least one discharge port of the exhaust gas introduction pipe is disposed facing at least one of the intake branch pipes of the plurality of cylinders, and the return exhaust gas introduction structure of the intake manifold is characterized in that:

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US11852109B1 (en) * 2022-08-25 2023-12-26 GM Global Technology Operations LLC Vehicle gas distribution to intake manifold runners

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CN112160852A (en) * 2020-10-09 2021-01-01 潍柴动力股份有限公司 Air inlet mixing device and engine
US11852109B1 (en) * 2022-08-25 2023-12-26 GM Global Technology Operations LLC Vehicle gas distribution to intake manifold runners

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