JP6211246B2 - EGR gas mixing device - Google Patents

EGR gas mixing device Download PDF

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JP6211246B2
JP6211246B2 JP2012024658A JP2012024658A JP6211246B2 JP 6211246 B2 JP6211246 B2 JP 6211246B2 JP 2012024658 A JP2012024658 A JP 2012024658A JP 2012024658 A JP2012024658 A JP 2012024658A JP 6211246 B2 JP6211246 B2 JP 6211246B2
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venturi
annular slit
annular
egr
pipe
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JP2013160189A (en
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永哉 杉村
永哉 杉村
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Hino Motors 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
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Description

本発明は、ＥＧＲガス混合装置に関するものである。   The present invention relates to an EGR gas mixing device.

従来より、自動車のエンジン等では、排気側から排気ガスの一部を抜き出して吸気側へと戻し、その吸気側に戻された排気ガスでエンジン内での燃料の燃焼を抑制させて燃焼温度を下げることによりＮＯxの発生を低減するようにした、いわゆる排気ガス再循環（ＥＧＲ：Exhaust Gas Recirculation）が行われており、一般的に、この種の排気ガス再循環を行う場合には、排気マニホールドから排気管に至る排気通路の適宜位置と、吸気マニホールドの入口付近の吸気管との間をＥＧＲパイプにより接続し、該ＥＧＲパイプを通して排気ガスを再循環するようにしている。   2. Description of the Related Art Conventionally, in an automobile engine or the like, a part of exhaust gas is extracted from the exhaust side and returned to the intake side, and combustion of fuel in the engine is suppressed by the exhaust gas returned to the intake side so that the combustion temperature is increased. So-called exhaust gas recirculation (EGR), which reduces the generation of NOx by lowering, is performed. Generally, when this type of exhaust gas recirculation is performed, an exhaust manifold is used. An appropriate position of the exhaust passage extending from the exhaust pipe to the exhaust pipe and an intake pipe near the inlet of the intake manifold are connected by an EGR pipe, and the exhaust gas is recirculated through the EGR pipe.

ただし、吸気管の側面に単純にＥＧＲパイプを接続するだけでは、吸気管内を流れる吸気に対して排気ガスを均一に混合することが難しく、更には、吸気管に対するＥＧＲパイプの接続部分における開口が狭いために吸気に対する排気ガスの混入割合を急激に高めることができないなどの不都合があった。   However, simply connecting the EGR pipe to the side surface of the intake pipe makes it difficult to uniformly mix the exhaust gas with the intake air flowing through the intake pipe. Furthermore, there is an opening at the connection portion of the EGR pipe to the intake pipe. Due to the narrowness, there is a disadvantage that the mixing ratio of the exhaust gas to the intake air cannot be increased rapidly.

このような不都合を改善するため、図４〜図７に示す如く、吸気管１の途中に吸気２の流れを絞り込むベンチュリ部３を形成して該ベンチュリ部３の外周に環状チャンバ４を設け、該環状チャンバ４に対し排気側から排気ガス５の一部を抜き出して導くＥＧＲパイプ６を接続し、前記ベンチュリ部３のスロート部に環状チャンバ４と吸気管１内部とを連通する環状スリット７を形成して前記ベンチュリ部３を上流側の縮径部８と下流側の拡張部９とに分割したＥＧＲガス混合装置が提案されている。   In order to improve such inconvenience, as shown in FIGS. 4 to 7, a venturi portion 3 for narrowing the flow of the intake air 2 is formed in the middle of the intake pipe 1, and an annular chamber 4 is provided on the outer periphery of the venturi portion 3. An EGR pipe 6 that extracts and guides a part of the exhaust gas 5 from the exhaust side is connected to the annular chamber 4, and an annular slit 7 that connects the annular chamber 4 and the inside of the intake pipe 1 is connected to the throat portion of the venturi 3. There has been proposed an EGR gas mixing device that is formed and divides the venturi portion 3 into an upstream reduced diameter portion 8 and a downstream expanded portion 9.

即ち、このようにすれば、ＥＧＲパイプ６により環状チャンバ４に導かれた排気ガス５が、ベンチュリ部３に形成した環状スリット７を通して全周から吸気管１内部に流入し、しかも、前記ベンチュリ部３の拡張部９側に生じる負圧部により環状チャンバ４内の排気ガス５が良好に吸引されることになるので、大量の排気ガス５を吸気管１内の吸気２に対し良好に混合せしめて混合ガス２’とすることができる。   That is, in this way, the exhaust gas 5 guided to the annular chamber 4 by the EGR pipe 6 flows into the intake pipe 1 from the entire circumference through the annular slit 7 formed in the venturi portion 3, and the venturi portion 3, the exhaust gas 5 in the annular chamber 4 is satisfactorily sucked by the negative pressure portion generated on the side of the expansion portion 9, so that a large amount of the exhaust gas 5 is mixed well with the intake air 2 in the intake pipe 1. Thus, a mixed gas 2 ′ can be obtained.

この際、ベンチュリ部３の縮径部８の終端に対し拡張部９の始端を半径方向外側にずらして段差を形成することが本発明と同じ出願人により既に提案されており（下記の特許文献１を参照）、このようにすれば、ベンチュリ部３の最小内径部位置（縮径部８の終端位置）よりも下流側（拡張部９側）に生じる負圧部が環状スリット７の内部に入り込み易くなり、縮径部８及び拡張部９の夫々の端面に傾斜面を後加工した場合と変わらない高い吸引作用が得られる。   At this time, it has already been proposed by the same applicant as the present invention to form a step by shifting the starting end of the expansion portion 9 radially outward with respect to the end of the reduced diameter portion 8 of the venturi portion 3 (the following patent document). 1), the negative pressure portion generated on the downstream side (expansion portion 9 side) of the minimum inner diameter portion position (end position of the reduced diameter portion 8) of the venturi portion 3 is formed inside the annular slit 7 in this way. It becomes easy to enter, and a high suction action that is the same as when the inclined surfaces are post-processed on the respective end faces of the reduced diameter portion 8 and the expanded portion 9 is obtained.

また、本発明と同じ出願人は、環状スリット７の最下レベルより低い環状チャンバ４の領域を前記環状スリット７の最下レベルまで底上げして形成することも提案しており（下記の特許文献２を参照）、このようにすれば、排気側から吸気側へ再循環される排気ガスが結露して凝縮水が生じても、その凝縮水が環状チャンバ４内に大量に溜まってしまう事態が起こらなくなる。   The same applicant as the present invention has also proposed that the region of the annular chamber 4 that is lower than the lowest level of the annular slit 7 is raised to the lowest level of the annular slit 7 (Patent Documents below). 2), in this way, even if the exhaust gas recirculated from the exhaust side to the intake side is condensed and condensed water is generated, a large amount of the condensed water is accumulated in the annular chamber 4. It won't happen.

特開２００７−９２５９２号公報JP 2007-92592 A 特開２０１０−１０１１９１号公報JP 2010-101191 A

しかしながら、図４〜図７に示す従来のＥＧＲガス混合装置を以ってしても、エンジンにターボチャージャが搭載されている場合には、吸気側が過給されているために排気側との圧力差が少なくなってしまい、特に回転数の高い運転領域等で必要な量の排気ガス５を再循環させることが難しくなるため、ターボチャージャとして容量可変式のターボチャージャ（バリアブルジオメトリーターボチャージャ）を採用し、該ターボチャージャを制御することで排気圧力を強制的に高める措置を施し、これにより吸気側と排気側との圧力差を確保して必要な量の排気ガス５を再循環させるようにしているが、このようなターボチャージャによる排気圧力を上げる措置がポンピングロスを増加させて燃費の悪化を招いてしまっており、いかに少ない差圧で必要な排気ガスの再循環量を確保できるようにするかが未だに大きな課題として残っている。   However, even if the conventional EGR gas mixing device shown in FIGS. 4 to 7 is used, when the turbocharger is mounted on the engine, the pressure on the exhaust side is increased because the intake side is supercharged. Since the difference becomes smaller and it becomes difficult to recirculate the required amount of exhaust gas 5 particularly in the operating region where the rotational speed is high, a variable capacity turbocharger (variable geometry turbocharger) is used as a turbocharger. Adopting and taking measures to forcibly increase the exhaust pressure by controlling the turbocharger, thereby ensuring a pressure difference between the intake side and the exhaust side and recirculating a necessary amount of exhaust gas 5 However, measures to increase the exhaust pressure by such a turbocharger have increased pumping loss, leading to a deterioration in fuel consumption. , OR can be ensured recirculation amount of required exhaust gas is still remains a major challenge.

本発明は、斯かる実情に鑑みて成したもので、従来よりも少ない差圧で必要な排気ガスの再循環量を確保し得るＥＧＲガス混合装置を提供することを目的としている。   The present invention has been made in view of such a situation, and an object of the present invention is to provide an EGR gas mixing device capable of ensuring a necessary amount of exhaust gas recirculation with a differential pressure less than that of the prior art.

本発明は、吸気管の途中にベンチュリ部を形成して該ベンチュリ部の外周に環状チャンバを設けると共に、該環状チャンバに対し排気側から排気ガスの一部を抜き出して導くＥＧＲパイプを接続し、前記ベンチュリ部に環状チャンバ内部と吸気管内部とを連通する環状スリットを形成して前記ベンチュリ部を上流側の縮径部と下流側の拡張部とに分割したＥＧＲガス混合装置であって、前記環状スリットが前記ベンチュリ部の軸心方向に間隔を空けて形成されていると共に、前記環状チャンバに前記ＥＧＲパイプを接続するにあたり、該ＥＧＲパイプの軸心が前記環状スリットの中間位置より縮径部側へオフセットされ且つ前記ＥＧＲパイプを延長した先が環状スリットに対し部分的に重複するように配置されており、しかも、ベンチュリ部の縮径部の終端に対し拡張部の始端を半径方向外側にずらして段差が形成されるようにしたことを特徴とするものである。 The present invention forms a venturi part in the middle of the intake pipe and provides an annular chamber on the outer periphery of the venturi part, and connects an EGR pipe for extracting and guiding a part of the exhaust gas from the exhaust side to the annular chamber, An EGR gas mixing device in which an annular slit that communicates the inside of the annular chamber and the inside of the intake pipe is formed in the venturi portion, and the venturi portion is divided into an upstream reduced diameter portion and a downstream extension portion, An annular slit is formed at an interval in the axial direction of the venturi portion, and when the EGR pipe is connected to the annular chamber, the EGR pipe has an axial center that is smaller in diameter than an intermediate position of the annular slit. destination of and extended the EGR pipe is offset to the side is arranged so as to partially overlap with respect to the annular slit, moreover, the venturi section To the end of the reduced diameter portion by shifting the starting end of the extension portion radially outward and is characterized in that it has such a step is formed.

而して、このようにすれば、ＥＧＲパイプを通して導かれた排気ガスが、ベンチュリ部の環状スリットに対し吸気の流れ方向の上流側から斜めに流入し、吸気の流れに沿うように円滑に吸気管内に流れ込むことになるため、ＥＧＲパイプの軸心を環状スリットの中間位置に合わせて配置していた時に生じていたような渦流が環状スリットへの流入時に形成されなくなり、ＥＧＲパイプからの排気ガスが吸気管に吸い込まれ易くなって高い吸引作用が得られ、同じ量の排気ガスを従来よりも少ない差圧で再循環させることが可能となる。   Thus, in this way, the exhaust gas guided through the EGR pipe flows obliquely from the upstream side in the flow direction of the intake air into the annular slit of the venturi portion, and smoothly takes in the intake air so as to follow the intake air flow. Since it flows into the pipe, the eddy current that was generated when the axis of the EGR pipe was arranged at the intermediate position of the annular slit is not formed when the EGR pipe flows into the annular slit, and the exhaust gas from the EGR pipe Becomes easy to be sucked into the intake pipe and a high suction action is obtained, and the same amount of exhaust gas can be recirculated with a lower differential pressure than in the prior art.

また、ベンチュリ部の縮径部の終端に対し拡張部の始端を半径方向外側にずらして段差が形成されるようにしているので、ベンチュリ部の最小内径部位置（縮径部の終端位置）よりも下流側（拡張部側）に生じる負圧部が環状スリットの内部に入り込み易くなって更に高い吸引作用が得られる。 Also, since the start of the extension to the end of the reduced diameter portion of the base Nchuri portion to the step is shifted radially outward are formed, the end position of the minimum inner diameter portion position (reduced diameter portion of the venturi section The negative pressure portion generated on the downstream side (expanded portion side) more easily enters the inside of the annular slit, and a higher suction action is obtained.

更に、本発明においては、環状スリットの最下レベルより低い環状チャンバの領域を前記環状スリットの最下レベルまで底上げして形成することが好ましく、このようにすれば、排気側から吸気側へ再循環される排気ガスが結露して凝縮水が生じても、その凝縮水が環状チャンバ内に大量に溜まってしまう事態が起こらなくなる。   Furthermore, in the present invention, it is preferable that the annular chamber region lower than the lowest level of the annular slit is formed so as to rise to the lowest level of the annular slit. Even if the circulated exhaust gas is condensed and condensed water is generated, a situation in which the condensed water is accumulated in a large amount in the annular chamber does not occur.

本発明のＥＧＲガス混合装置によれば、下記の如き種々の優れた効果を奏し得る。   According to the EGR gas mixing device of the present invention, the following various excellent effects can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、従来よりも少ない差圧で必要な排気ガスの再循環量を確保することができるので、エンジンの回転数が高い運転領域等でターボチャージャを制御して強制的に排気圧力を上げる措置の度合を従来よりも軽減することができ、これによりポンピングロスを減少させて燃費の向上を図ることができる。   (I) According to the invention described in claim 1 of the present invention, a necessary amount of exhaust gas recirculation can be ensured with a lower differential pressure than in the prior art. The degree of the measure for forcibly increasing the exhaust pressure by controlling the turbocharger can be reduced as compared with the prior art, thereby reducing the pumping loss and improving the fuel consumption.

（ＩＩ）本発明の請求項１に記載の発明によれば、ベンチュリ部の最小内径部位置（縮径部の終端位置）よりも下流側（拡張部側）に生じる負圧部を環状スリットの内部に入り込み易くして更に高い吸引作用を得ることができるので、エンジンの回転数が高い運転領域等でターボチャージャを制御して強制的に排気圧力を上げる措置の度合を更に軽減することができ、これによりポンピングロスを減少させてより一層の燃費の向上を図ることができる。 According to the invention described in claim 1, (II) the present invention, the negative pressure portion than the minimum inner diameter portion position of the venturi section (end position of the reduced diameter portion) occurs in the downstream side (extension side) of the annular slit Since it can easily enter the interior and obtain a higher suction action, it is possible to further reduce the degree of measures to forcibly increase the exhaust pressure by controlling the turbocharger in an operating region where the engine speed is high. Thus, the pumping loss can be reduced to further improve fuel efficiency.

（ＩＩＩ）本発明の請求項２に記載の発明によれば、排気側から吸気側へ再循環される排気ガスが結露して凝縮水が生じても、その凝縮水が環状チャンバ内に大量に溜まってしまう事態を未然に防止することができ、これによって、排気ガスの凝縮水が何らかの拍子で大量にエンジン側に導かれて該エンジンを損傷してしまったり、その溜まり部に凝縮水が濃縮されながら溜まり続けることで腐食が生じてしまったりする虞れを未然に防止することができる。 (III) According to the invention described in claim 2 of the present invention, even if the exhaust gas recirculated from the exhaust side to the intake side is condensed to produce condensed water, a large amount of the condensed water is generated in the annular chamber. It is possible to prevent the situation where it accumulates, and as a result, a large amount of exhaust gas condensate is led to the engine side in a certain amount of time, causing damage to the engine, or condensate condensing in the reservoir However, it is possible to prevent the possibility that corrosion will occur by continuing to accumulate while being accumulated.

本発明を実施する形態の一例を側方から見た断面図である。It is sectional drawing which looked at an example of the form which implements the present invention from the side. 図１の構造を上方から見た平面図である。It is the top view which looked at the structure of FIG. 1 from upper direction. 本形態例の効果について検証したグラフである。It is the graph which verified about the effect of this form example. 従来例を上方から見た断面図である。It is sectional drawing which looked at the prior art example from the upper part. 従来例を上方から見た平面図である。It is the top view which looked at the conventional example from the upper part. 図５のＶＩ−ＶＩ矢視の断面図である。It is sectional drawing of the VI-VI arrow of FIG. 図６のＶＩＩ−ＶＩＩ矢視の断面図である。It is sectional drawing of the VII-VII arrow of FIG.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１及び図２は本発明を実施する形態の一例を示すもので、先に説明した図４〜図７の従来例と同様に構成したＥＧＲガス混合装置の場合と同様に、吸気管１の途中にベンチュリ部３が形成されており、該ベンチュリ部３の外周に環状チャンバ４が設けられていると共に、該環状チャンバ４に対し排気側から排気ガス５の一部を抜き出して導くＥＧＲパイプ６が接続され、前記ベンチュリ部３に環状チャンバ４内部と吸気管１内部とを連通する環状スリット７が形成されて前記ベンチュリ部３が上流側の縮径部８と下流側の拡張部９とに分割されるようになっているが、本形態例においては、前記環状スリット７が前記ベンチュリ部３の軸心方向に間隔を空けて形成されていると共に、前記環状チャンバ４に前記ＥＧＲパイプ６を接続するにあたり、該ＥＧＲパイプ６の軸心６ａが前記環状スリット７の中間位置Ｐより縮径部８側へオフセットされ且つ前記ＥＧＲパイプ６を延長した先が環状スリット７に対し部分的に重複するように配置したところを特徴としている。 1 and 2 show an example of an embodiment for carrying out the present invention. Similarly to the case of the EGR gas mixing apparatus configured in the same manner as the conventional example shown in FIGS. A venturi portion 3 is formed in the middle, and an annular chamber 4 is provided on the outer periphery of the venturi portion 3, and an EGR pipe 6 that extracts and guides a part of the exhaust gas 5 from the exhaust side to the annular chamber 4. Are connected to each other, and an annular slit 7 is formed in the venturi portion 3 so as to communicate the inside of the annular chamber 4 and the inside of the intake pipe 1. In this embodiment, the annular slit 7 is formed with a space in the axial direction of the venturi 3, and the EGR pipe 6 is connected to the annular chamber 4. To connect Or, as previously the axis 6a is extending the intermediate position P and are offset from the reduced diameter portion 8 side EGR pipe 6 of the annular slit 7 of the EGR pipe 6 is partially overlapping with respect to the annular slit 7 It is characterized by its location.

即ち、本発明者は、図４〜図７の従来例でＥＧＲパイプ６の軸心６ａが環状スリット７の中間位置Ｐに合わせて配置されていることに着目し、このような配置を採用した場合に、ＥＧＲパイプ６からの排気ガス５の流れが吸気管１内の吸気２の流れに対し直交する向きから流入し、ここで急激に曲げられて吸気２の流れに混合することで渦流（図６参照）が生じて円滑な流れ込みが阻害されているという事実を見いだし、排気ガス５の円滑な合流を図るために、ＥＧＲパイプ６の軸心６ａを環状スリット７の中間位置Ｐより縮径部８側へオフセットして配置することを創案するに到った。   That is, the present inventor paid attention to the fact that the shaft center 6a of the EGR pipe 6 is arranged in accordance with the intermediate position P of the annular slit 7 in the conventional examples of FIGS. In this case, the flow of the exhaust gas 5 from the EGR pipe 6 flows in from the direction orthogonal to the flow of the intake air 2 in the intake pipe 1, and is bent suddenly and mixed with the flow of the intake air 2. In order to find out the fact that the smooth inflow is hindered and the exhaust gas 5 is smoothly joined, the shaft center 6a of the EGR pipe 6 is reduced in diameter from the intermediate position P of the annular slit 7 in order to find out the fact that The inventors have come up with the idea of arranging the components offset to the part 8 side.

例えば、ここに図示している例では、環状スリット７の幅を約１０ｍｍ程度に設定しているが、ＥＧＲパイプ６の軸心６ａを前記環状スリット７の中間位置Ｐを基準として縮径部８側へ約５ｍｍ程度のずらし量でオフセットして配置することにより、後述する如き吸引作用の向上が図られることを確認している。   For example, in the example shown here, the width of the annular slit 7 is set to about 10 mm, but the shaft center 6a of the EGR pipe 6 is set to the reduced diameter portion 8 with the intermediate position P of the annular slit 7 as a reference. It has been confirmed that the suction action can be improved as will be described later by disposing it to the side with an offset amount of about 5 mm.

また、特に本形態例においては、図４〜図７の従来例の場合と同様に、ベンチュリ部３の縮径部８の終端に対し拡張部９の始端を半径方向外側にずらして段差を形成するようしてあり、しかも、環状スリット７の最下レベルより低い環状チャンバ４の領域を前記環状スリット７の最下レベルまで底上げして形成するようにしてある。   Further, particularly in the present embodiment, as in the case of the conventional example of FIGS. 4 to 7, a step is formed by shifting the starting end of the expanded portion 9 radially outward with respect to the end of the reduced diameter portion 8 of the venturi portion 3. In addition, the region of the annular chamber 4 lower than the lowest level of the annular slit 7 is formed so as to be raised to the lowest level of the annular slit 7.

而して、このようにＥＧＲガス混合装置を構成すれば、ＥＧＲパイプ６を通して導かれた排気ガス５が、ベンチュリ部３の環状スリット７に対し吸気２の流れ方向の上流側から斜めに流入し、吸気２の流れに沿うように円滑に吸気管１内に流れ込むことになるため、ＥＧＲパイプ６の軸心６ａを環状スリット７の中間位置Ｐに合わせて配置していた時に生じていたような渦流が環状スリット７への流入時に形成されなくなり、ＥＧＲパイプ６からの排気ガス５が吸気管１に吸い込まれ易くなって高い吸引作用が得られ、同じ量の排気ガス５を従来よりも少ない差圧で再循環させることが可能となる。   Thus, if the EGR gas mixing device is configured in this way, the exhaust gas 5 guided through the EGR pipe 6 flows obliquely from the upstream side in the flow direction of the intake air 2 into the annular slit 7 of the venturi section 3. Since the air smoothly flows into the intake pipe 1 along the flow of the intake air 2, the shaft center 6 a of the EGR pipe 6 seems to have occurred when the shaft center 6 a is arranged at the intermediate position P of the annular slit 7. A vortex flow is not formed when flowing into the annular slit 7, the exhaust gas 5 from the EGR pipe 6 is easily sucked into the intake pipe 1, and a high suction action is obtained. It becomes possible to recirculate with pressure.

事実、図３に検証結果をグラフで示している通り、ＥＧＲパイプ６の軸心６ａを環状スリット７の中間位置Ｐに合わせて配置した「オフセットなし」の例において、所定量の排気ガス５を再循環するのに必要であった圧力に対し、ＥＧＲパイプ６の軸心６ａを環状スリット７の中間位置Ｐより縮径部８側へ５ｍｍオフセットして配置した「５ｍｍオフセット」の例では、同じ量の排気ガス５を再循環するのに必要な圧力が大幅に低減されることが本発明者により確かめられている。   In fact, as shown in the graph of the verification result in FIG. 3, in the example of “no offset” in which the axis 6 a of the EGR pipe 6 is arranged at the intermediate position P of the annular slit 7, a predetermined amount of exhaust gas 5 is removed. In the example of “5 mm offset” in which the shaft center 6 a of the EGR pipe 6 is offset by 5 mm from the intermediate position P of the annular slit 7 toward the reduced diameter portion 8 with respect to the pressure required for recirculation. The inventor has confirmed that the pressure required to recirculate a quantity of exhaust gas 5 is greatly reduced.

従って、上記形態例によれば、従来よりも少ない差圧で必要な排気ガス５の再循環量を確保することができるので、エンジンの回転数が高い運転領域等でターボチャージャを制御して強制的に排気圧力を上げる措置の度合を従来よりも軽減することができ、これによりポンピングロスを減少させて燃費の向上を図ることができる。   Therefore, according to the above embodiment, the necessary recirculation amount of the exhaust gas 5 can be ensured with a lower differential pressure than in the prior art. Therefore, the turbocharger is controlled and forced in an operation region where the engine speed is high. In particular, the degree of measures to increase the exhaust pressure can be reduced as compared with the conventional method, and thereby the pumping loss can be reduced and the fuel consumption can be improved.

また、本形態例においては、ベンチュリ部３の縮径部８の終端に対し拡張部９の始端を半径方向外側にずらして段差を形成したことにより、ベンチュリ部３の最小内径部位置（縮径部８の終端位置）よりも下流側（拡張部９側）に生じる負圧部を環状スリット７の内部に入り込み易くして更に高い吸引作用を得ることができるので、エンジンの回転数が高い運転領域等でターボチャージャを制御して強制的に排気圧力を上げる措置の度合を更に軽減することができ、これによりポンピングロスを減少させてより一層の燃費の向上を図ることができる。   Further, in the present embodiment, the minimum inner diameter portion position (reduced diameter) of the venturi portion 3 is formed by shifting the starting end of the expanded portion 9 radially outward with respect to the end of the reduced diameter portion 8 of the venturi portion 3. Since the negative pressure portion generated on the downstream side (the extended portion 9 side) from the end position of the portion 8 can easily enter the inside of the annular slit 7 and obtain a higher suction action, operation with a high engine speed is possible. It is possible to further reduce the degree of measures for forcibly increasing the exhaust pressure by controlling the turbocharger in a region or the like, thereby reducing the pumping loss and further improving the fuel consumption.

更に、環状スリット７の最下レベルより低い環状チャンバ４の領域を前記環状スリット７の最下レベルまで底上げして形成したことにより、排気側から吸気２側へ再循環される排気ガス５が結露して凝縮水が生じても、その凝縮水が環状チャンバ４内に大量に溜まってしまう事態を未然に防止することができ、これによって、排気ガス５の凝縮水が何らかの拍子で大量にエンジン側に導かれて該エンジンを損傷してしまったり、その溜まり部に凝縮水が濃縮されながら溜まり続けることで腐食が生じてしまったりする虞れを未然に防止することができる。   Further, the region of the annular chamber 4 lower than the lowest level of the annular slit 7 is formed so as to be raised to the lowest level of the annular slit 7, so that the exhaust gas 5 recirculated from the exhaust side to the intake 2 side is condensed. Even when condensed water is generated, it is possible to prevent a large amount of the condensed water from being accumulated in the annular chamber 4. It is possible to prevent the possibility that the engine will be damaged by being guided to the point where the engine is damaged, or that the corrosion will occur due to the accumulation of condensed water in the reservoir while continuing to accumulate.

尚、本発明のＥＧＲガス混合装置は、上述の形態例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, the EGR gas mixing apparatus of this invention is not limited only to the above-mentioned example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

１ 吸気管
３ ベンチュリ部
４ 環状チャンバ
５ 排気ガス
６ ＥＧＲパイプ
６ａ ＥＧＲパイプの軸心
７ 環状スリット
８ 縮径部
９ 拡張部
Ｐ 環状スリットの中間位置 DESCRIPTION OF SYMBOLS 1 Intake pipe 3 Venturi part 4 Annular chamber 5 Exhaust gas 6 EGR pipe 6a Axis center of EGR pipe 7 Annular slit 8 Reduced diameter part 9 Expansion part P Intermediate position of annular slit

Claims (2)

吸気管の途中にベンチュリ部を形成して該ベンチュリ部の外周に環状チャンバを設けると共に、該環状チャンバに対し排気側から排気ガスの一部を抜き出して導くＥＧＲパイプを接続し、前記ベンチュリ部に環状チャンバ内部と吸気管内部とを連通する環状スリットを形成して前記ベンチュリ部を上流側の縮径部と下流側の拡張部とに分割したＥＧＲガス混合装置であって、前記環状スリットが前記ベンチュリ部の軸心方向に間隔を空けて形成されていると共に、前記環状チャンバに前記ＥＧＲパイプを接続するにあたり、該ＥＧＲパイプの軸心が前記環状スリットの中間位置より縮径部側へオフセットされ且つ前記ＥＧＲパイプを延長した先が環状スリットに対し部分的に重複するように配置されており、しかも、ベンチュリ部の縮径部の終端に対し拡張部の始端を半径方向外側にずらして段差が形成されるようにしたことを特徴とするＥＧＲガス混合装置。 A venturi is formed in the middle of the intake pipe, and an annular chamber is provided on the outer periphery of the venturi, and an EGR pipe for extracting and guiding a part of the exhaust gas from the exhaust side is connected to the annular chamber, and the venturi is connected to the venturi. An EGR gas mixing device in which an annular slit that communicates the inside of the annular chamber and the inside of the intake pipe is formed, and the venturi portion is divided into an upstream reduced diameter portion and a downstream extended portion, wherein the annular slit is the It is formed with a space in the axial direction of the venturi part, and when connecting the EGR pipe to the annular chamber, the axis of the EGR pipe is offset from the intermediate position of the annular slit toward the reduced diameter part. and previously obtained by extending the EGR pipe is disposed so as to partially overlap with respect to the annular slit, moreover, the reduced diameter portion of the venturi section EGR gas mixing apparatus being characterized in that as a step is formed by shifting the starting end of the extension portion radially outward relative to an end. 環状スリットの最下レベルより低い環状チャンバの領域を前記環状スリットの最下レベルまで底上げして形成したことを特徴とする請求項１に記載のＥＧＲガス混合装置。 2. The EGR gas mixing apparatus according to claim 1 , wherein a region of the annular chamber lower than the lowest level of the annular slit is formed by raising the bottom of the annular slit to the lowest level of the annular slit.
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