JP5595018B2 - EGR device - Google Patents

EGR device Download PDF

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JP5595018B2
JP5595018B2 JP2009272159A JP2009272159A JP5595018B2 JP 5595018 B2 JP5595018 B2 JP 5595018B2 JP 2009272159 A JP2009272159 A JP 2009272159A JP 2009272159 A JP2009272159 A JP 2009272159A JP 5595018 B2 JP5595018 B2 JP 5595018B2
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passage
egr
air supply
supply passage
engine
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JP2011112038A (en
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賢二 平岡
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Mitsubishi Heavy Industries Ltd
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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

Description

本発明は、エンジンの排気通路から分岐したＥＧＲ通路を有し、エンジンの排気ガスの一部を抽出してなるＥＧＲガスを前記ＥＧＲ通路を通して給気通路内の吸入空気と合流させるＥＧＲ装置に関するものである。   The present invention relates to an EGR device having an EGR passage branched from an engine exhaust passage, and for joining EGR gas obtained by extracting a part of engine exhaust gas with intake air in an air supply passage through the EGR passage. It is.

ディーゼルエンジンの排気ガス中の窒素酸化物（ＮＯｘ）を低減する技術として、排気ガス再循環（以下、ＥＧＲと称する）が知られている。該ＥＧＲは、エンジンの排気通路から排気ガスの一部を抽出してなるＥＧＲ（排気ガス再循環）ガスを、ＥＧＲ通路を通して給気通路に還流するものである。即ち、ＥＧＲを使用した場合、エンジンの燃焼室内には新規の吸入空気と排気ガスの一部、即ちＥＧＲガスが混合されて導入される。   As a technique for reducing nitrogen oxide (NOx) in exhaust gas of a diesel engine, exhaust gas recirculation (hereinafter referred to as EGR) is known. The EGR recirculates an EGR (exhaust gas recirculation) gas obtained by extracting a part of the exhaust gas from the exhaust passage of the engine to the air supply passage through the EGR passage. That is, when EGR is used, new intake air and a part of the exhaust gas, that is, EGR gas is mixed and introduced into the combustion chamber of the engine.

通常、ＥＧＲガスは、ＥＧＲガスと給気通路中の吸入空気との圧力差を利用して給気通路中に導入される。このために、ＥＧＲガスと吸入空気との圧力差が大きくなるエンジンの低負荷域においては、ＥＧＲガスが給気通路中に導入されやすい。しかし、ＥＧＲガスと吸入空気との圧力差が小さくなるエンジンの高負荷域においては、ＥＧＲガスが給気通路中に導入されにくく、ＮＯｘの低減が困難なものとなっている。   Usually, the EGR gas is introduced into the air supply passage using a pressure difference between the EGR gas and the intake air in the air supply passage. For this reason, the EGR gas is easily introduced into the air supply passage in a low load region of the engine where the pressure difference between the EGR gas and the intake air becomes large. However, in a high load region of the engine where the pressure difference between the EGR gas and the intake air is small, it is difficult for the EGR gas to be introduced into the air supply passage, and it is difficult to reduce NOx.

また、油圧ショベルやフォークリフトなど、使用する機器によっては搭載性の観点から、前記ＥＧＲ通路と給気通路は垂直に合流される。このように、給気通路へ一方向からしかＥＧＲガスが入らず、しかも合流部の直後にインテークマニホールドがあるとＥＧＲと吸入空気との混合が進まず、多気筒エンジンにおいては気筒間でＥＧＲ量のバラツキが生じる。   In addition, depending on the equipment used, such as a hydraulic excavator and a forklift, the EGR passage and the air supply passage are vertically joined from the viewpoint of mountability. In this way, if EGR gas enters the air supply passage only from one direction and there is an intake manifold immediately after the merging portion, mixing of EGR and intake air does not proceed, and in a multi-cylinder engine, the amount of EGR between cylinders does not advance. Variation occurs.

そこで、エンジンの高負荷域においても、ＥＧＲガスを給気通路中に導入しＮＯｘの低減が可能な技術が特許文献１に開示されている。図５は特許文献１に開示された従来技術におけるＥＧＲ装置の要部断面図である。特許文献１に開示された技術は、図５に示すように、ＥＧＲ通路１０４を給気通路１０３に合流させることにより、排気通路から取り出したＥＧＲガスを給気通路１０３を経て燃焼室に再循環させるようにした過給エンジンにおいて、前記ＥＧＲガスの流出口１１３を構成するＥＧＲノズル１１２を給気通路１１２の中央部付近に開口させたことにより、高負荷域においても流出口１１３に作用する給気の静圧を低下させてＥＧＲを円滑に吸い出させるようにしたものである。   Therefore, Patent Document 1 discloses a technique capable of reducing NOx by introducing EGR gas into an air supply passage even in a high engine load range. FIG. 5 is a cross-sectional view of a principal part of an EGR device disclosed in Patent Document 1 according to the prior art. As shown in FIG. 5, the technique disclosed in Patent Document 1 joins the EGR passage 104 to the air supply passage 103 to recirculate the EGR gas taken out from the exhaust passage to the combustion chamber through the air supply passage 103. In the supercharged engine, the EGR nozzle 112 that constitutes the EGR gas outlet 113 is opened near the center of the air supply passage 112, so that the supply of air that acts on the outlet 113 even in a high load region is provided. EGR is sucked out smoothly by reducing the static pressure of Qi.

さらに、高負荷域でのＥＧＲガスの給気通路中への導入性の向上に加えて、ＥＧＲガスと吸入空気の混合性を向上させた技術として、特許文献２には、ＥＧＲ通路の先端部を給気通路内に挿入及び突出させるとともに、ＥＧＲ管の先端の開口部を給気の上流側に向けて配設し、更に該開口部の近傍に渦流発生部を設けた技術が開示されている。   Furthermore, as a technique for improving the mixing property of EGR gas and intake air in addition to the improvement of the introduction property of EGR gas into the supply passage in a high load region, Patent Document 2 discloses a tip portion of the EGR passage. Is inserted and protruded into the air supply passage, the opening at the tip of the EGR pipe is disposed toward the upstream side of the air supply, and a vortex generator is provided in the vicinity of the opening. Yes.

特開２０００−９７１１１号公報JP 2000-97111 A 特開２０００−５４９１５号公報JP 2000-54915 A

しかしながら、特許文献１、特許文献２に開示された技術の何れにおいても、給気通路内にＥＧＲ通路の一部が存在するため、該ＥＧＲ通路の一部が給気通路内の吸入空気の流れの障害となり、燃費の悪化が生じたり、吸入空気量を安定させることが難しくなる。   However, in both of the techniques disclosed in Patent Document 1 and Patent Document 2, since a part of the EGR passage is present in the supply passage, a part of the EGR passage is a flow of the intake air in the supply passage. As a result, the fuel consumption deteriorates and it becomes difficult to stabilize the intake air amount.

従って、本発明はかかる従来技術の問題に鑑み、給気通路内にＥＧＲ通路の先端部などの障害物を配することなく、エンジンの高負荷域においてもＥＧＲガスを吸入空気に合流させて排気ガス中のＮＯｘの低減が可能であり、しかもＥＧＲガスと給気通路内の吸入空気とＥＧＲガスの混合性を向上させたＥＧＲ装置を提供することを目的とする。   Therefore, in view of the problems of the prior art, the present invention combines the EGR gas with the intake air even in a high engine load range without disposing an obstacle such as the tip of the EGR passage in the air supply passage. An object of the present invention is to provide an EGR device capable of reducing NOx in gas and improving the mixing of EGR gas, intake air in a supply passage and EGR gas.

上記課題を解決するため本発明においては、エンジンの排気通路から分岐したＥＧＲ通路を有し、エンジンの排気ガスの一部を抽出してなるＥＧＲガスを前記ＥＧＲ通路を通して給気通路内の吸入空気と合流させるＥＧＲ装置において、前記ＥＧＲ通路をエンジンの給気マニホールドに接続するとともに、前記ＥＧＲ通路内に前記給気通路の先端部を侵入させ、該給気通路の先端部を、前記エンジンの給気マニホールドよりも上流に、前記ＥＧＲ通路と給気通路とで二重管構造を形成するラップ部が生じるように配し、前記侵入される給気通路の先端部以降には前記ＥＧＲ通路と同一の内径を有し該ＥＧＲ通路と一体に形成されて前記給気マニホールドに接続される合流通路を有し、さらに、前記給気通路を形成する管は、前記ＥＧＲ通路の屈曲部の外側から、該屈曲部の外側の管壁面を貫通して侵入し、該ＥＧＲ通路内では屈折部を有さずに同一通路径で直状に形成されるとともに、前記ラップ部の二重管構造は、前記ＥＧＲ通路の屈曲部から前記給気通路の先端部までＥＧＲ通路の通路軸線と平行に且つ直状に形成され、前記ＥＧＲ通路の屈曲部の上流側と下流側では略同等の通路径を有して形成され、前記屈曲部の上流側と下流側の前記ＥＧＲ通路の通路径は、前記ＥＧＲ通路内に侵入される直状に形成された前記給気通路の通路径よりも大きく形成されることを特徴とする。
In order to solve the above-described problems, the present invention has an EGR passage branched from the exhaust passage of the engine, and the intake air in the supply passage through the EGR passage is used to extract EGR gas extracted from a part of the exhaust gas of the engine. The EGR passage is connected to an air supply manifold of the engine, and a front end portion of the air supply passage is inserted into the EGR passage, and the front end portion of the air supply passage is connected to the supply air of the engine. Arranged so that a lap portion forming a double pipe structure is formed by the EGR passage and the air supply passage upstream from the air manifold, and is the same as the EGR passage after the leading end of the air supply passage to be invaded. And a joint passage formed integrally with the EGR passage and connected to the air supply manifold, and a pipe forming the air supply passage is formed on the EGR passage. From the outside of the curved portions, penetrate through the outer tube wall surface of the bent portion, with the said EGR passage is formed in a straight shape in the same passage diameter without a bent portion, of the lap portion two The heavy pipe structure is formed in a straight shape parallel to the passage axis of the EGR passage from the bent portion of the EGR passage to the tip portion of the air supply passage, and is substantially the same on the upstream side and the downstream side of the bent portion of the EGR passage. The passage diameter of the EGR passage on the upstream side and the downstream side of the bent portion is larger than the passage diameter of the air supply passage formed in a straight shape that penetrates into the EGR passage. Is also formed to be large .

これにより、エンジンが運転されると、吸入空気は給気通路内を流れ、給気通路内の先端部以降は給気マニホールドなどのエンジンの給気側に接続されるＥＧＲ通路内を流れる。このとき、吸入空気の流れによって減圧し、該流れの外部の流体であるＥＧＲガスを吸引する。即ち、上記構成によりエジェクターの原理によって吸入空気がＥＧＲガスを吸引し、これによりＥＧＲガスの吸入空気への導入性が向上し、ＥＧＲガスと吸入空気の混合性も向上する。また、ＥＧＲ通路と給気通路とで二重管構造を形成するラップ部の存在により、ＥＧＲガスの流れを吸入空気の流れと同方向に揃えることができ、エジェクターの原理による吸入空気のＥＧＲガスを吸引する効果が高まる。さらに、上記構成により吸入空気の流れを妨げるものはないため、燃費の悪化や吸入空気導入量の安定性などの面での障害も生じない。
これにより、ＥＧＲガスの吸入空気への導入性が向上するため、エンジンの高負荷域においてもＥＧＲガスを吸入空気へ導入することが可能となり、排気ガス中のＮＯｘの低減が可能となる。
さらに、構成が簡単であるため、既設設備にあっては簡単な改造で、新規設備にあっては低コストで本発明を実施することができる。 As a result, when the engine is operated, the intake air flows in the air supply passage, and after the tip in the air supply passage, it flows in the EGR passage connected to the air supply side of the engine such as an air supply manifold. At this time, the pressure is reduced by the flow of the intake air, and the EGR gas that is a fluid outside the flow is sucked. That is, with the above configuration, the intake air sucks the EGR gas according to the principle of the ejector, thereby improving the introduction of the EGR gas into the intake air and improving the mixability of the EGR gas and the intake air. In addition, the presence of a lap portion that forms a double-pipe structure with the EGR passage and the air supply passage allows the EGR gas flow to be aligned in the same direction as the intake air flow, and the EGR gas of the intake air according to the ejector principle The effect of sucking in is increased. Furthermore, since there is nothing that obstructs the flow of intake air by the above configuration, there are no problems in terms of deterioration of fuel consumption and stability of intake air introduction amount.
As a result, the introduction of EGR gas into the intake air is improved, so that the EGR gas can be introduced into the intake air even in a high load region of the engine, and NOx in the exhaust gas can be reduced.
Furthermore, since the configuration is simple, the present invention can be implemented with simple modifications for existing facilities and at low cost for new facilities.

また、前記給気通路は、前記給気通路のＥＧＲ通路内への侵入域で、屈折部を有さずに直状に形成されている。
これにより、吸入空気とＥＧＲガスの合流部周辺では、前記給気通路形状が吸入空気の流れの障害となることなく、エジェクターの原理による吸入空気のＥＧＲガスを吸引する効果をより効率的に発揮させることができる。 The air supply passage is an intrusion area of the air supply passage into the EGR passage, and is formed in a straight shape without a refracting portion .
As a result, in the vicinity of the merged portion of the intake air and the EGR gas, the shape of the supply passage does not obstruct the flow of the intake air, and the effect of sucking the EGR gas of the intake air based on the ejector principle is more efficiently exhibited. Can be made.

また、前記給気通路を形成する管は、前記ＥＧＲ通路の屈曲部の外側から、該屈曲部の外側の管壁面を貫通して侵入される。
ＥＧＲ通路の屈折部を利用して、給気通路をＥＧＲ通路内に侵入させることで、給気通路をＥＧＲ通路内への侵入域で屈折部を有さずに直状に形成することが容易となる。 The pipe forming the air supply passage penetrates from the outside of the bent portion of the EGR passage through the pipe wall surface outside the bent portion.
By using the refracting part of the EGR passage to allow the air supply passage to enter the EGR passage, it is easy to form the air supply passage in a straight shape without the refracting portion in the intrusion area into the EGR passage. It becomes.

また、前記給気通路の先端部よりも下流側の前記合流通路にＥＧＲガスの流れをＥＧＲ通路中央方向に向けるＥＧＲガス偏向手段を設けるとよい。
これにより、吸入空気とＥＧＲガスとの混合がさらに促進される。エンジンに導入される吸入空気とＥＧＲガスとが混合を促進することで、エンジンにおける気筒間でＥＧＲ量のバラツキをさらに抑制することができる。 Further, an EGR gas deflecting means for directing the flow of EGR gas toward the center of the EGR passage may be provided in the merge passage downstream of the front end portion of the air supply passage.
Thereby, mixing of intake air and EGR gas is further promoted. The intake air introduced into the engine and the EGR gas promote the mixing, whereby the variation in the EGR amount between the cylinders in the engine can be further suppressed.

また、前記給気通路のＥＧＲ通路内への侵入域より上流側のＥＧＲ通路に、ＥＧＲガスの流量調整可能なＥＧＲバルブを設けるとよい。
これにより、給気通路中の吸入空気に合流させるＥＧＲガス量の調整が可能となる。 Further, an EGR valve capable of adjusting the flow rate of the EGR gas may be provided in the EGR passage upstream of the area where the air supply passage enters the EGR passage.
This makes it possible to adjust the amount of EGR gas that is merged with the intake air in the supply passage.

以上記載のごとく本発明によれば、給気通路内にＥＧＲ通路の先端部などの障害物を配することなく、エンジンの高負荷域においてもＥＧＲガスを吸入空気に導入して排気ガス中のＮＯｘの低減が可能であり、しかもＥＧＲガスと給気通路内の吸入空気とＥＧＲガスの混合性を向上させたＥＧＲ装置を提供することができる。   As described above, according to the present invention, the EGR gas is introduced into the intake air even in the high load region of the engine without disposing an obstacle such as the tip of the EGR passage in the supply passage. It is possible to provide an EGR device capable of reducing NOx and improving the mixing of EGR gas, intake air in the supply passage and EGR gas.

実施例に係るＥＧＲ装置を示す概略図である。It is the schematic which shows the EGR apparatus which concerns on an Example. 図１におけるＡ部拡大図である。It is the A section enlarged view in FIG. 図２におけるＢ−Ｂ断面図である。It is BB sectional drawing in FIG. 図１におけるＡ部拡大図の別の形態を示すものである。It shows another form of the A section enlarged view in FIG. 従来技術におけるＥＧＲ装置の要部断面図である。It is principal part sectional drawing of the EGR apparatus in a prior art.

以下、図面を参照して本発明の好適な実施例を例示的に詳しく説明する。但しこの実施例に記載されている構成部品の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、この発明の範囲をそれに限定する趣旨ではなく、単なる説明例に過ぎない。   Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

図１は、本実施例に係るＥＧＲ装置を示す概略図である。図１において、エンジン２は４つの気筒を有する４サイクルディーゼルエンジンである。   FIG. 1 is a schematic diagram illustrating an EGR apparatus according to the present embodiment. In FIG. 1, the engine 2 is a four-cycle diesel engine having four cylinders.

エンジン２には、給気マニホールド６、合流通路９を介して給気通路８が合流されるとともに、排気マニホールド４を介して排気通路４０が接続されている。
給気通路８には、ターボチャージャ２０のコンプレッサ２０ａが設けられている。コンプレッサ２０ａは後述するタービン２０ｂに同軸駆動されるものである。給気通路８のコンプレッサ２０ａよりも下流側には、給気通路８を流れる吸入空気と大気で熱交換を行うインタークーラー１０が設けられている。また、給気通路８のインタークーラー１０よりも下流側には、給気通路８内を流通する吸入空気の流量を調節するスロットバルブ１２が設けられている。 An air supply passage 8 is joined to the engine 2 via an air supply manifold 6 and a merge passage 9, and an exhaust passage 40 is connected to the engine 2 via an exhaust manifold 4.
The air supply passage 8 is provided with a compressor 20 a of the turbocharger 20. The compressor 20a is coaxially driven by a turbine 20b described later. An intercooler 10 that exchanges heat between the intake air flowing through the air supply passage 8 and the atmosphere is provided downstream of the compressor 20a in the air supply passage 8. Further, a slot valve 12 for adjusting the flow rate of the intake air flowing through the air supply passage 8 is provided downstream of the intercooler 10 in the air supply passage 8.

排気通路４０には、ターボチャージャ２０のタービン２０ｂが設けられている。タービン２０ｂは、エンジン２からの排気ガスにより駆動されるものである。また、排気マニホールド４には、排気の一部を給気側へ再循環させるＥＧＲ通路１４が接続されている。なお本実施例においては、ＥＧＲ通路１４を排気マニホールド４に接続しているが、ＥＧＲ通路１４を排気通路４０に接続することもできる。ＥＧＲ通路１４には、ＥＧＲクーラー１８及びＥＧＲバルブ１６が設けられている。
ＥＧＲクーラー１８は、ＥＧＲバルブ１６よりも排気マニホールド４側に設けられ、ＥＧＲクーラー１８を通過するＥＧＲガスと冷却水とで熱交換して、該ＥＧＲガスの温度を低下させるものである。また、ＥＧＲバルブ１６は、ＥＧＲ通路１４の通路断面積を変更することで、ＥＧＲ通路１４を流れるＥＧＲガスの量を変更するものである。 In the exhaust passage 40, a turbine 20b of the turbocharger 20 is provided. The turbine 20 b is driven by exhaust gas from the engine 2. The exhaust manifold 4 is connected to an EGR passage 14 that recirculates a part of the exhaust to the supply side. In this embodiment, the EGR passage 14 is connected to the exhaust manifold 4, but the EGR passage 14 may be connected to the exhaust passage 40. An EGR cooler 18 and an EGR valve 16 are provided in the EGR passage 14.
The EGR cooler 18 is provided closer to the exhaust manifold 4 than the EGR valve 16, and performs heat exchange between the EGR gas passing through the EGR cooler 18 and the cooling water to lower the temperature of the EGR gas. The EGR valve 16 changes the amount of EGR gas flowing through the EGR passage 14 by changing the passage sectional area of the EGR passage 14.

図２は、図１におけるＡ部拡大図であり、給気通路８とＥＧＲ通路１４との接続部を示している。図１及び図２を使用して給気通路８とＥＧＲ通路１４との接続部について説明する。   FIG. 2 is an enlarged view of a portion A in FIG. 1 and shows a connection portion between the air supply passage 8 and the EGR passage 14. The connection part of the air supply channel | path 8 and the EGR channel | path 14 is demonstrated using FIG.1 and FIG.2.

本実施例における給気通路８とＥＧＲ通路１４との接続部においては、ＥＧＲ通路１４内に、ＥＧＲ通路１４の屈曲部の外側から、給気通路８を挿入している。そして、ＥＧＲ通路１４内に挿入した給気通路８の先端８ａは、給気マニホールド４よりも上流側に配されるとともに、図３に示したようにＥＧＲ通路１４と給気通路８とが二重管構造となる図２にａで示したラップ部分を形成するように配される。さらに、給気通路８は、ＥＧＲ通路１４内で屈曲部を有さず直状に形成され、給気通路８内を流れる吸入空気の流れがＥＧＲ通路１４との接続前後を通じて同方向に流れるようにＥＧＲ通路１４内に挿入される。   In the connection portion between the air supply passage 8 and the EGR passage 14 in this embodiment, the air supply passage 8 is inserted into the EGR passage 14 from the outside of the bent portion of the EGR passage 14. The leading end 8a of the air supply passage 8 inserted into the EGR passage 14 is arranged upstream of the air supply manifold 4, and the EGR passage 14 and the air supply passage 8 are separated from each other as shown in FIG. It arrange | positions so that the lap | wrap part shown by a in FIG. Further, the air supply passage 8 is formed in a straight shape without a bent portion in the EGR passage 14 so that the flow of the intake air flowing in the air supply passage 8 flows in the same direction before and after the connection with the EGR passage 14. Into the EGR passage 14.

かかる構成により、エンジン２が運転されると、吸入空気が図２において右側から左側に向けて示した矢印のように給気通路８内を流れ、給気通路８の先端部８ａ以降はＥＧＲ通路１４と一体に形成されて給気マニホールド６に接続される合流通路９内を流れる。このとき、図２において右側から左側に向けた矢印で示した吸入空気の流れによって減圧し、該吸入空気の流れの外部にある流体であるＥＧＲガスを吸引する。即ち、上記構成によりエジェクターの原理によって吸入空気がＥＧＲガスを吸引し、これによりＥＧＲガスの吸入空気への導入性が向上し、ＥＧＲガスと吸入空気の混合性も向上し、エンジン２における気筒間でＥＧＲ量のバラツキを抑制することができる。また、ＥＧＲ通路と給気通路とで二重管構造を形成するラップ部の存在により、ＥＧＲガスの流れを吸入空気の流れと同方向に揃えることができ、エジェクターの原理による吸入空気のＥＧＲガスを吸引する効果が高められる。さらに、上記構成により吸入空気の流れを妨げるものはないため、燃費の悪化や吸入空気導入量の安定性などの面での障害も生じない。
これにより、ＥＧＲガスの吸入空気への導入性及びＥＧＲガスと吸入空気の混合性が向上するため、エンジンの高負荷域においてもＥＧＲガスを吸入空気へ導入することが可能となり、排気ガス中のＮＯｘの低減が可能となる。 With this configuration, when the engine 2 is operated, the intake air flows in the air supply passage 8 as shown by the arrows shown from the right side to the left side in FIG. 14 flows in a confluence passage 9 formed integrally with the air supply manifold 6. At this time, the pressure is reduced by the flow of the intake air indicated by the arrow from the right side to the left side in FIG. 2, and the EGR gas that is the fluid outside the flow of the intake air is sucked. That is, with the above configuration, the intake air sucks EGR gas according to the principle of the ejector, thereby improving the introduction of EGR gas into the intake air, and improving the mixing of EGR gas and intake air. Thus, variation in the EGR amount can be suppressed. In addition, the presence of a lap portion that forms a double-pipe structure with the EGR passage and the air supply passage allows the EGR gas flow to be aligned in the same direction as the intake air flow, and the EGR gas of the intake air according to the ejector principle The effect of sucking in is increased. Furthermore, since there is nothing that obstructs the flow of intake air by the above configuration, there are no problems in terms of deterioration of fuel consumption and stability of intake air introduction amount.
As a result, the introduction of EGR gas into the intake air and the mixing of EGR gas and intake air are improved, so that it is possible to introduce EGR gas into the intake air even in a high engine load range. NOx can be reduced.

図４は、図１におけるＡ部拡大図の別の形態を示すものである。図４に示すように、給気通路８の先端部の下流側である合流通路９内に、ＥＧＲガスの流れを合流通路９の中央方向に向けるガイド２４を設けている。なお、ガイド２４は、ＥＧＲガスの流れを合流通路９の中央方向に向けるものであればフィンなどとすることもでき、形態は限定されるものではない。
ガイド２４を設けて、ＥＧＲガスの流れを合流通路９の中央方向に向けることにより、吸入空気とＥＧＲガスとの混合がさらに促進され、エンジン２における気筒間でＥＧＲ量のバラツキをさらに抑制することができる。 FIG. 4 shows another form of the A-part enlarged view in FIG. As shown in FIG. 4, a guide 24 that directs the flow of EGR gas toward the center of the merging passage 9 is provided in the merging passage 9 on the downstream side of the tip of the air supply passage 8. The guide 24 may be a fin or the like as long as it directs the flow of EGR gas toward the center of the merging passage 9, and the form is not limited.
By providing the guide 24 and directing the flow of EGR gas toward the center of the merge passage 9, the mixing of the intake air and the EGR gas is further promoted, and the variation in the EGR amount between the cylinders in the engine 2 is further suppressed. Can do.

なお、エンジン２に導入する吸入空気とＥＧＲガスとの比率はＥＧＲバルブ１６の開度により調整する。ＥＧＲガスと吸入空気との圧力差は、エンジン及び使用するターボによって異なるため、ＥＧＲバルブ１６の開度は、エンジンごとに負荷及び回転数に応じたマップを作成し、エンジン運転時に該マップを参照して調整、制御するとよい。   The ratio between the intake air introduced into the engine 2 and the EGR gas is adjusted by the opening degree of the EGR valve 16. Since the pressure difference between the EGR gas and the intake air differs depending on the engine and the turbo used, the opening of the EGR valve 16 is created for each engine according to the load and rotation speed, and this map is referred to when the engine is operating. Then, it is good to adjust and control.

エンジンの高負荷域においてもＥＧＲガスを吸入空気に導入して排気ガス中のＮＯｘの低減が可能であり、しかもＥＧＲガスと給気通路内の吸入空気とＥＧＲガスの混合性を向上させたＥＧＲ装置として利用することができる。   EGR gas is introduced into the intake air even in the high load range of the engine, and NOx in the exhaust gas can be reduced, and the EGR gas, the intake air in the air supply passage, and the EGR gas are improved in mixing characteristics. It can be used as a device.

２ エンジン
４ 排気マニホールド
６ 給気マニホールド
８ 給気通路
８ａ 給気通路の先端部
１６ ＥＧＲバルブ
２４ ガイド（偏向手段）
４０ ＥＧＲ通路
2 Engine 4 Exhaust Manifold 6 Air Supply Manifold 8 Air Supply Passage 8a Tip of Air Supply Passage 16 EGR Valve 24 Guide (Deflecting Means)
40 EGR passage

Claims (3)

エンジンの排気通路から分岐したＥＧＲ通路を有し、エンジンの排気ガスの一部を抽出してなるＥＧＲガスを前記ＥＧＲ通路を通して給気通路内の吸入空気と合流させるＥＧＲ装置において、
前記ＥＧＲ通路をエンジンの給気マニホールドに接続するとともに、前記ＥＧＲ通路内に前記給気通路の先端部を侵入させ、
該給気通路の先端部を、前記エンジンの給気マニホールドよりも上流に、前記ＥＧＲ通路と給気通路とで二重管構造を形成するラップ部が生じるように配し、
前記侵入される給気通路の先端部以降には前記ＥＧＲ通路と同一の内径を有し該ＥＧＲ通路と一体に形成されて前記給気マニホールドに接続される合流通路を有し、
さらに、前記給気通路を形成する管は、前記ＥＧＲ通路の屈曲部の外側から、該屈曲部の外側の管壁面を貫通して侵入し、該ＥＧＲ通路内では屈折部を有さずに同一通路径で直状に形成されるとともに、
前記ラップ部の二重管構造は、前記ＥＧＲ通路の屈曲部から前記給気通路の先端部までＥＧＲ通路の通路軸線と平行に且つ直状に形成され、
前記ＥＧＲ通路の屈曲部の上流側と下流側では略同等の通路径を有して形成され、前記屈曲部の上流側と下流側の前記ＥＧＲ通路の通路径は、前記ＥＧＲ通路内に侵入される直状に形成された前記給気通路の通路径よりも大きく形成されることを特徴とするＥＧＲ装置。 In an EGR apparatus that has an EGR passage branched from an exhaust passage of an engine, and combines EGR gas obtained by extracting a part of engine exhaust gas with intake air in an air supply passage through the EGR passage,
The EGR passage is connected to an air supply manifold of the engine, and a front end portion of the air supply passage is inserted into the EGR passage,
The tip of the air supply passage is arranged upstream of the air supply manifold of the engine so that a lap portion forming a double pipe structure is formed by the EGR passage and the air supply passage,
After the leading end of the air supply passage to be intruded, there is a confluence passage that has the same inner diameter as the EGR passage and is formed integrally with the EGR passage and connected to the air supply manifold,
Further, the pipe forming the air supply passage enters from the outside of the bent portion of the EGR passage through the pipe wall surface outside the bent portion, and is the same without having a refracting portion in the EGR passage. It is formed in a straight shape with a passage diameter ,
The double pipe structure of the wrap portion is formed in a straight shape parallel to the passage axis of the EGR passage from the bent portion of the EGR passage to the tip of the air supply passage,
The upstream and downstream sides of the bent portion of the EGR passage are formed with substantially the same passage diameter, and the upstream and downstream passage diameters of the EGR passage are intruded into the EGR passage. An EGR device having a diameter larger than the diameter of the air supply passage formed in a straight shape . 前記給気通路の先端部よりも下流側の前記合流通路にＥＧＲガスの流れをＥＧＲ通路中央方向に向けるＥＧＲガス偏向手段を設けたことを特徴とする請求項１に記載のＥＧＲ装置。   2. The EGR apparatus according to claim 1, wherein EGR gas deflecting means for directing the flow of EGR gas toward the center of the EGR passage is provided in the merging passage downstream of the front end portion of the air supply passage. 前記給気通路のＥＧＲ通路内への侵入域より上流側のＥＧＲ通路に、ＥＧＲガスの流量調整可能なＥＧＲバルブを設けたことを特徴とする請求項１または２に記載のＥＧＲ装置。
3. The EGR device according to claim 1, wherein an EGR valve capable of adjusting an EGR gas flow rate is provided in an EGR passage upstream of a region where the air supply passage enters the EGR passage. 4.
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