JP2009203920A - Intake device - Google Patents

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JP2009203920A
JP2009203920A JP2008047948A JP2008047948A JP2009203920A JP 2009203920 A JP2009203920 A JP 2009203920A JP 2008047948 A JP2008047948 A JP 2008047948A JP 2008047948 A JP2008047948 A JP 2008047948A JP 2009203920 A JP2009203920 A JP 2009203920A
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intake
air
flow
egr gas
intake air
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JP4853480B2 (en
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Makoto Shigematsu
信 重松
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Denso Corp
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Denso 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

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Abstract

<P>PROBLEM TO BE SOLVED: To accelerate mixing of intake air and EGR gas without complicating a shape of an intake manifold 2 nor enlarging the size. <P>SOLUTION: An air connector 7 includes a protrusion 12 deflecting main flow of intake air by separating boundary layer flow of intake air along an inner wall, and EGR piping 3 opens to promote deflection by the protrusion 12 by flow of blasted EGR gas. Consequently, the intake air flow is strongly deflected by the separated intake air boundary layer flow and flow of EGR gas and forms a swirl, so that the mixing of the intake air and EGR gas are accelerated. The protrusion 12 has a simple structure protruding into the air connector 7, thereby the shape of the intake manifold 2 is not complicated nor enlarged in size. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、インテークマニホールド内にＥＧＲガスを導入することができる吸気装置に関する。   The present invention relates to an intake device capable of introducing EGR gas into an intake manifold.

従来から、エンジンに吸気を供給する吸気装置では、エンジンから排気される排気ガスの一部をＥＧＲガスとしてインテークマニホールド内に導入し、再度エンジンに吸引させて排出ガス中の窒素酸化物を低減する技術が公知となっている。そして、この吸気装置では、吸気とＥＧＲガスとの混合を促進するために種々の構造が提案されている。   Conventionally, in an intake device that supplies intake air to an engine, a part of the exhaust gas exhausted from the engine is introduced into the intake manifold as EGR gas and is again sucked into the engine to reduce nitrogen oxides in the exhaust gas. Technology is known. In this intake device, various structures have been proposed in order to promote mixing of intake air and EGR gas.

例えば、特許文献１に記載の吸気装置によれば、インテークマニホールドにおいて、エアコネクタとサージタンクとの間に、吸気とＥＧＲガスとの混合を促すための予混合室が設けられている。そして、ＥＧＲガス配管は、予混合室に開口するようにインテークマニホールドに組み込まれている。   For example, according to the intake device described in Patent Document 1, in the intake manifold, a premixing chamber for promoting mixing of intake air and EGR gas is provided between the air connector and the surge tank. The EGR gas pipe is incorporated in the intake manifold so as to open to the premixing chamber.

また、特許文献２に記載の吸気装置によれば、インテークマニホールド内に、孔付きの隔壁板がＥＧＲガスの吹出口に対向するように配されている。また、孔は、各気筒への吸気ポートに対応するように複数の位置に設けられており、ＥＧＲガスは各孔から吹き出すことで分散されて各気筒に均等に供給される。
さらに、特許文献３に記載の吸気装置によれば、インテークマニホールド内に、ＥＧＲガスの流れに直交するとともに吸気流に平行となるリブが突設され、ＥＧＲガスはリブにより分散されて各気筒に均等に供給される。 Further, according to the intake device described in Patent Document 2, the partition plate with holes is arranged in the intake manifold so as to face the outlet of the EGR gas. Further, the holes are provided at a plurality of positions so as to correspond to the intake ports to the respective cylinders, and the EGR gas is dispersed by being blown out from the respective holes and is uniformly supplied to the respective cylinders.
Further, according to the intake device described in Patent Document 3, ribs that are orthogonal to the flow of the EGR gas and parallel to the intake flow are projected in the intake manifold, and the EGR gas is dispersed by the ribs and is distributed to each cylinder. Evenly supplied.

しかし、いずれの吸気装置においても、予混合室やリブを設けたり、隔壁板を配したりすることによって、インテークマニホールドの形状が複雑化したり、体格が大きくなったりしてしまう。
特開平１０−１９６４６６号公報 実開平３−７３６４９号公報 実開昭６２−９５１６５号公報 However, in any of the intake devices, the shape of the intake manifold is complicated or the size of the intake manifold is increased by providing a premixing chamber, ribs, or arranging a partition plate.
JP-A-10-196466 Japanese Utility Model Publication No. 3-73649 Japanese Utility Model Publication No. 62-95165

本発明は、上記の問題点を解決するためになされたものであり、その目的は、インテークマニホールドの形状を複雑にしたり、体格を大きくしたりすることなく、吸気とＥＧＲガスとの混合を促進することができる吸気装置を提供することにある。   The present invention has been made to solve the above-described problems, and its purpose is to promote the mixing of intake air and EGR gas without complicating the shape of the intake manifold or increasing the size of the intake manifold. It is an object of the present invention to provide an air intake device that can be used.

〔請求項１の手段〕
請求項１に記載の吸気装置は、エンジンの各気筒に吸気を分配するインテークマニホールドと、インテークマニホールド内にＥＧＲガスを吹き出すＥＧＲ配管とを備える。また、インテークマニホールドは、各気筒への接続口を有するサージタンクと、サージタンクの上流側に連続するように設けられ、サージタンク内に吸気を導くエアコネクタとを有している。 [Means of Claim 1]
An intake device according to a first aspect includes an intake manifold that distributes intake air to each cylinder of the engine, and an EGR pipe that blows EGR gas into the intake manifold. The intake manifold includes a surge tank having a connection port to each cylinder, and an air connector that is provided continuously to the upstream side of the surge tank and guides intake air into the surge tank.

そして、エアコネクタは、自身の内壁に沿う吸気の境界層流れを剥離させることでサージタンクに向かう吸気の主流を偏向させる偏向部を有し、ＥＧＲ配管は、吹き出したＥＧＲガスの流れによって偏向部による主流の偏向を促すことができるようにエアコネクタ内に開口している。   The air connector has a deflecting portion that deflects the main flow of the intake air toward the surge tank by separating the boundary layer flow of the intake air along the inner wall of the air connector. The air connector is opened so that the mainstream deflection can be promoted.

これにより、吸気流は、偏向部により剥離した吸気の境界層流れとＥＧＲガスの流れとにより強力に偏向されて渦流を形成する。このため、吸気とＥＧＲガスとの混合が促進される。また、偏向部は、単に境界層流れが剥離するように壁面が設定されればよいので、インテークマニホールドの形状が複雑になったり、体格が大きくなったりする虞もない。この結果、吸気装置において、インテークマニホールドの形状を複雑にしたり、体格を大きくしたりすることなく、吸気とＥＧＲガスとの混合を促進することができる。   Thereby, the intake flow is strongly deflected by the boundary layer flow of the intake air separated by the deflecting portion and the flow of EGR gas to form a vortex flow. For this reason, mixing of intake air and EGR gas is promoted. In addition, since the deflecting section may be set so that the boundary layer flow is simply separated, there is no possibility that the shape of the intake manifold becomes complicated or the physique becomes large. As a result, in the intake device, mixing of the intake air and the EGR gas can be promoted without complicating the shape of the intake manifold or increasing the size of the intake manifold.

なお、ＥＧＲガスをインテークマニホールド内に導入しない場合、ＥＧＲガスによる偏向効果がないため、渦流の発生が緩和されて吸気の圧力損失が小さくなり吸気が促進される。   When EGR gas is not introduced into the intake manifold, there is no deflection effect due to EGR gas, so that the generation of eddy currents is mitigated, the pressure loss of intake air is reduced, and intake air is promoted.

〔請求項２の手段〕
請求項２に記載の吸気装置によれば、偏向部は、エアコネクタの内壁がエアコネクタ内に膨出することで設けられている。
これにより、偏向部をエアコネクタとともに一体成形することができる。 [Means of claim 2]
According to the intake device of the second aspect, the deflecting portion is provided by causing the inner wall of the air connector to bulge into the air connector.
Thereby, a deflection | deviation part can be integrally molded with an air connector.

〔請求項３の手段〕
請求項３に記載の吸気装置によれば、ＥＧＲ配管は、偏向部よりも下流側で上方に向けて開口している。
これにより、温度の高いＥＧＲガスの上昇流を吸気流の偏向に利用することができる。このため、さらに強力に吸気流を偏向させることができる。 [Means of claim 3]
According to the intake device of the third aspect, the EGR pipe opens upward on the downstream side of the deflecting portion.
Thereby, the rising flow of the EGR gas having a high temperature can be used for the deflection of the intake air flow. For this reason, the intake flow can be deflected more powerfully.

〔請求項４の手段〕
請求項４に記載の吸気装置によれば、ＥＧＲ配管のエアコネクタ内における開口部は扁平に設けられている。
これにより、吸気流は、ＥＧＲガスによってさらに強力に偏向されるので、渦流の形成が促されて吸気とＥＧＲガスとの混合がさらに促進される。 [Means of claim 4]
According to the intake device of the fourth aspect, the opening in the air connector of the EGR pipe is provided flat.
Thereby, since the intake flow is deflected more strongly by the EGR gas, the formation of the vortex flow is promoted, and the mixing of the intake air and the EGR gas is further promoted.

最良の形態の吸気装置は、エンジンの各気筒に吸気を分配するインテークマニホールドと、インテークマニホールド内にＥＧＲガスを吹き出すＥＧＲ配管とを備える。また、インテークマニホールドは、各気筒への接続口を有するサージタンクと、サージタンクの上流側に連続するように設けられ、サージタンク内に吸気を導くエアコネクタとを有している。   The intake device of the best mode includes an intake manifold that distributes intake air to each cylinder of the engine, and an EGR pipe that blows EGR gas into the intake manifold. The intake manifold includes a surge tank having a connection port to each cylinder, and an air connector that is provided continuously to the upstream side of the surge tank and guides intake air into the surge tank.

そして、エアコネクタは、自身の内壁に沿う吸気の境界層流れを剥離させることでサージタンクに向かう吸気の主流を偏向させる偏向部を有し、ＥＧＲ配管は、吹き出したＥＧＲガスの流れによって偏向部による主流の偏向を促すことができるようにエアコネクタ内に開口している。
また、偏向部は、エアコネクタの内壁がエアコネクタ内に膨出することで設けられている。さらに、ＥＧＲ配管は、偏向部よりも下流側で上方に向けて開口している。 The air connector has a deflecting portion that deflects the main flow of the intake air toward the surge tank by separating the boundary layer flow of the intake air along the inner wall of the air connector. The air connector is opened so that the mainstream deflection can be promoted.
Moreover, the deflection | deviation part is provided because the inner wall of an air connector protrudes in an air connector. Further, the EGR pipe opens upward on the downstream side of the deflecting portion.

〔実施例１の構成〕
実施例１の吸気装置１の構成を、図面を用いて説明する。
吸気装置１は、エンジン（図示せず）に吸気を供給するものであり、例えば、図１、図２に示すように、エンジンの各気筒に吸気を分配するインテークマニホールド２と、インテークマニホールド２内にＥＧＲガスを吹き出すＥＧＲ配管３とを備える。 [Configuration of Example 1]
The configuration of the intake device 1 according to the first embodiment will be described with reference to the drawings.
The intake device 1 supplies intake air to an engine (not shown). For example, as shown in FIGS. 1 and 2, an intake manifold 2 that distributes intake air to each cylinder of the engine, and an intake manifold 2 And an EGR pipe 3 for blowing out EGR gas.

インテークマニホールド２は、例えば、４気筒のエンジンに吸気を供給するものであり、下流端がエンジンヘッド（図示せず）に取り付けられる４つの吸気ポート５と、各吸気ポート５に吸気を分配するサージタンク６と、サージタンク６の上流側に連続するように設けられ、サージタンク６内に吸気を導くエアコネクタ７とを有している。   The intake manifold 2 supplies intake air to, for example, a 4-cylinder engine, and has four intake ports 5 whose downstream ends are attached to an engine head (not shown), and a surge that distributes intake air to each intake port 5. A tank 6 and an air connector 7 are provided so as to continue to the upstream side of the surge tank 6 and guide intake air into the surge tank 6.

サージタンク６には各吸気ポート５が開口しており、吸気ポート５のサージタンク６への開口部が各気筒への接続口８をなしている。また、エアコネクタ７は略円形の断面を有し、湾曲しながらサージタンク６の一端に開口している。なお、インテークマニホールド２は、例えば、ナイロン６のような樹脂を素材として設けられている。   Each intake port 5 is opened in the surge tank 6, and the opening of the intake port 5 to the surge tank 6 forms a connection port 8 to each cylinder. The air connector 7 has a substantially circular cross section and opens at one end of the surge tank 6 while being curved. The intake manifold 2 is provided with a resin such as nylon 6 as a material, for example.

ＥＧＲ配管３の先端の開口部１０は、ＥＧＲガスが接続口８よりも上流側で吸気に対して吹き出ることができるように突出している。そして、ＥＧＲガスは、図３に示すように、接続口８よりも上流側で吸気と混合され、吸気とＥＧＲガスとの混合ガスは、旋回しながら吸気ポート５へ流入して各気筒に吸入される。なお、開口部１０は、例えば、円形に設けられている。   The opening 10 at the tip of the EGR pipe 3 protrudes so that EGR gas can be blown out of the intake air upstream of the connection port 8. As shown in FIG. 3, the EGR gas is mixed with the intake air upstream of the connection port 8, and the mixed gas of the intake air and the EGR gas flows into the intake port 5 while swirling and is sucked into each cylinder. Is done. The opening 10 is provided in a circular shape, for example.

〔実施例１の特徴〕
実施例１の吸気装置１の特徴を、図２、図４を用いて説明する。
エアコネクタ７の内壁の一部は、内部に向かって膨出して突条１２をなしている。そして、突条１２は、内壁に沿う吸気の境界層流れを剥離させることで、吸気の主流を偏向させる偏向部として機能する。つまり、内壁に沿ってサージタンク６に向かう吸気の境界層の一部は、突条１２により剥離して内壁に沿う方向から内部に向かう方向に向きを変え、この境界層の偏向により主流の偏向が促される。なお、突条１２は、エアコネクタ７やサージタンク６とともに一体成形されている。 [Features of Example 1]
Features of the intake device 1 according to the first embodiment will be described with reference to FIGS. 2 and 4.
A part of the inner wall of the air connector 7 bulges toward the inside to form a protrusion 12. And the protrusion 12 functions as a deflection | deviation part which deflects the main flow of intake air by peeling the boundary layer flow of intake air along an inner wall. That is, a part of the boundary layer of the intake air that goes to the surge tank 6 along the inner wall is peeled off by the ridge 12 and changed in a direction from the direction along the inner wall to the inside, and the deflection of the mainstream is caused by the deflection of the boundary layer. Is prompted. The protrusion 12 is integrally formed with the air connector 7 and the surge tank 6.

また、ＥＧＲ配管３は、突条１２の下流側で上方に向けて開口しており、吹き出したＥＧＲガスの流れにより、主流の偏向がさらに促される。
この結果、吸気流は、突条１２により剥離した境界層流れとＥＧＲガスの流れとにより強力に偏向されて渦流を形成する。 Further, the EGR pipe 3 opens upward on the downstream side of the ridge 12, and the mainstream deflection is further urged by the flow of the blown EGR gas.
As a result, the intake flow is strongly deflected by the boundary layer flow separated by the protrusions 12 and the EGR gas flow to form a vortex flow.

〔実施例１の効果〕
実施例１の吸気装置１によれば、エアコネクタ７は、自身の内壁に沿う吸気の境界層流れを剥離させることでサージタンク６に向かう吸気の主流を偏向させる突条１２を有し、ＥＧＲ配管３は、吹き出したＥＧＲガスの流れによって突条１２による主流の偏向を促すことができるようにエアコネクタ７内に開口している。 [Effect of Example 1]
According to the intake device 1 of the first embodiment, the air connector 7 has the protrusion 12 that deflects the main flow of the intake air toward the surge tank 6 by separating the boundary layer flow of the intake along the inner wall of the air connector 7. The pipe 3 is opened in the air connector 7 so that the mainstream can be deflected by the protrusion 12 by the flow of the blown EGR gas.

これにより、吸気流は、剥離した吸気の境界層流れとＥＧＲガスの流れとにより強力に偏向されて渦流を形成するので、吸気とＥＧＲガスとの混合が促進される。また、突条１２は、エアコネクタ７内に突出する簡易な構造なので、インテークマニホールド２の形状が複雑になったり、体格が大きくなったりする虞もない。この結果、吸気装置１において、インテークマニホールド２の形状を複雑にしたり、体格を大きくしたりすることなく、吸気とＥＧＲガスとの混合を促進することができる。   As a result, the intake air flow is strongly deflected by the separated boundary layer flow of the intake air and the flow of the EGR gas to form a vortex flow, so that mixing of the intake air and the EGR gas is promoted. Further, since the protrusion 12 has a simple structure that protrudes into the air connector 7, there is no possibility that the shape of the intake manifold 2 becomes complicated or the size of the intake manifold 2 becomes large. As a result, in the intake device 1, mixing of the intake air and the EGR gas can be promoted without complicating the shape of the intake manifold 2 or increasing the size of the intake manifold 2.

なお、ＥＧＲガスをインテークマニホールド２内に導入しない場合、ＥＧＲガスによる偏向効果がないため、渦流の発生が緩和されて吸気の圧力損失が小さくなり吸気が促進される。   If EGR gas is not introduced into the intake manifold 2, there is no deflection effect due to the EGR gas, so that the generation of vortex flow is alleviated, the pressure loss of the intake air is reduced, and the intake air is promoted.

また、ＥＧＲ配管３は、突条１２よりも下流側で上方に向けて開口している。
これにより、温度の高いＥＧＲガスの上昇流を吸気流の偏向に利用することができる。このため、さらに強力に吸気流を偏向させることができる。 Further, the EGR pipe 3 opens upward on the downstream side of the protrusion 12.
Thereby, the rising flow of the EGR gas having a high temperature can be used for the deflection of the intake air flow. For this reason, the intake flow can be deflected more powerfully.

〔変形例〕
実施例１の吸気装置１によれば、ＥＧＲ配管３の先端の開口部１０は円形に設けられていたが、例えば、図５に示すように、開口部１０を扁平に設けてもよい。
これにより、吸気流は、ＥＧＲガスによってさらに強力に偏向されるので、渦流の形成が促されて吸気とＥＧＲガスとの混合がさらに促進される。 [Modification]
According to the intake device 1 of the first embodiment, the opening 10 at the tip of the EGR pipe 3 is provided in a circular shape, but the opening 10 may be provided flat as shown in FIG. 5, for example.
Thereby, since the intake flow is deflected more strongly by the EGR gas, the formation of the vortex flow is promoted, and the mixing of the intake air and the EGR gas is further promoted.

吸気装置の斜視図である（実施例１）。(Example 1) which is a perspective view of an intake device. 吸気装置の横方向の断面図である（実施例１）。It is sectional drawing of the horizontal direction of an intake device (Example 1). 吸気装置内のガスの流れを示す説明図である（実施例１）。(Example 1) which is explanatory drawing which shows the flow of the gas in an intake device. 吸気装置の要部説明図である（実施例１）。(Example 1) which is principal part explanatory drawing of an intake device. 吸気装置の要部説明図である（変形例）。It is principal part explanatory drawing of an intake device (modification example).

符号の説明Explanation of symbols

１ 吸気装置
２ インテークマニホールド
３ ＥＧＲ配管
６ サージタンク
７ エアコネクタ
８ 接続口
１０ 開口部
１２ 突条（偏向部） DESCRIPTION OF SYMBOLS 1 Intake device 2 Intake manifold 3 EGR piping 6 Surge tank 7 Air connector 8 Connection port 10 Opening part 12 Projection (deflection part)

Claims (4)

エンジンの各気筒に吸気を分配するインテークマニホールドと、このインテークマニホールド内にＥＧＲガスを吹き出すＥＧＲ配管とを備える吸気装置において、
前記インテークマニホールドは、前記各気筒への接続口を有するサージタンクと、このサージタンクの上流側に連続するように設けられ、前記サージタンク内に吸気を導くエアコネクタとを有し、
このエアコネクタは、自身の内壁に沿う吸気の境界層流れを剥離させることで前記サージタンクに向かう吸気の主流を偏向させる偏向部を有し、
前記ＥＧＲ配管は、吹き出したＥＧＲガスの流れによって前記偏向部による前記主流の偏向を促すことができるように前記エアコネクタ内に開口していることを特徴とする吸気装置。 In an intake device including an intake manifold that distributes intake air to each cylinder of an engine, and an EGR pipe that blows EGR gas into the intake manifold,
The intake manifold has a surge tank having a connection port to each of the cylinders, and an air connector that is provided continuously to the upstream side of the surge tank and guides intake air into the surge tank,
This air connector has a deflecting portion that deflects the main flow of intake air toward the surge tank by separating the boundary layer flow of intake air along its inner wall,
The intake system according to claim 1, wherein the EGR pipe is opened in the air connector so that the deflection of the main flow by the deflecting unit can be promoted by the flow of the blown EGR gas. 請求項１に記載の吸気装置において、
前記偏向部は、前記エアコネクタの内壁が前記エアコネクタ内に膨出することで設けられていることを特徴とする吸気装置。 The intake device according to claim 1,
The intake device according to claim 1, wherein the deflecting portion is provided by an inner wall of the air connector bulging into the air connector. 請求項１または請求項２に記載の吸気装置において、
前記ＥＧＲ配管は、前記偏向部よりも下流側で上方に向けて開口していることを特徴とする吸気装置。 The intake device according to claim 1 or 2,
The intake device according to claim 1, wherein the EGR pipe opens upward on the downstream side of the deflecting portion. 請求項１ないし請求項３の内のいずれか１つに記載の吸気装置において、
前記ＥＧＲ配管の前記エアコネクタ内における開口部は扁平に設けられていることを特徴とする吸気装置。 The intake device according to any one of claims 1 to 3,
An air intake apparatus, wherein an opening in the air connector of the EGR pipe is provided flat.
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