JP3674329B2 - Exhaust gas introduction structure for exhaust gas recirculation system - Google Patents

Exhaust gas introduction structure for exhaust gas recirculation system Download PDF

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JP3674329B2
JP3674329B2 JP25086298A JP25086298A JP3674329B2 JP 3674329 B2 JP3674329 B2 JP 3674329B2 JP 25086298 A JP25086298 A JP 25086298A JP 25086298 A JP25086298 A JP 25086298A JP 3674329 B2 JP3674329 B2 JP 3674329B2
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exhaust gas
passage
intake
gas recirculation
introduction part
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JP2000080962A (en
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佳彦 加藤
光彦 大沼
晃 高橋
泰幸 岡本
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Mitsubishi Motors 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
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Description

【０００１】
【発明の属する技術分野】
本発明は、自動車などの内燃機関において、排気ガスの一部を吸気系に戻すようにする排気ガス還流装置に関し、特に排気ガス還流装置用排気ガス導入部構造に関するものである。
【０００２】
【従来の技術】
自動車用エンジンには、排気ガス中のＮＯｘを効果的に抑制するため、排気ガスの一部を吸気通路側に戻す排気ガス還流（ＥＧＲ：Ｅｘｈａｕｓｔ Ｇａｓ Ｒｅｃｉｒｃｕｌａｔｉｏｎ）装置がよく用いられている。
図４は従来の一般的なＥＧＲ装置を備えたエンジン全体の構成を示す図である。エンジン本体１には、各シリンダ内へ空気を供給する吸気通路（吸気マニホールド）２、各シリンダから排気ガスを排出する排気通路（排気マニホールド）３、排気通路３内の排気ガスを吸気通路２に還流させるためのＥＧＲ通路４、吸気通路２内に還流させる排気ガス量を調整するＥＧＲバルブ５、吸気通路の上流端に設けられたサージタンク６が接続されている。
【０００３】
図５は図４におけるＡ−Ａ矢視断面を示すものである。図５に示すように、サージタンク６上流の吸気管７の内部でスロットルバルブ８を通過した矢印Ｃで示す新気（外気から導入した空気）は、ＥＧＲ導入部９を通過した後、サージタンク６に送られ、吸気マニホールド２を通じて各気筒に送られる。また、ＥＧＲ導入部９周囲には環状通路１０が設けられ、ＥＧＲ通路４から導入される排気ガスが開口部１１から環状通路１０を通じてＥＧＲ導入部９に導かれるように構成されている。
【０００４】
そして、図６（ａ）の側面図及び図６（ｂ）の断面図〔図３（ａ）のＢ−Ｂ断面図〕に示すように、ＥＧＲ導入部９は、周上にほぼ等間隔に複数の孔部１２が形成されたアウタリング１３と、一端がアウタリング１３上流側の内壁に全周に渡り接合され他端がアウタリング１３内壁から離隔しているインナリング１４とから構成されている。
【０００５】
排気マニホールド３から排出される排気ガスの一部がＥＧＲ通路４を通じて環状通路１０に入ると、ＥＧＲ導入部９のアウタリング１３に形成された孔部１２を通じてアウタリング１３とインナリング１４との間に形成された空間に流入して、図５に示す矢印Ｄのように吸気管７に導かれ、新気に混入される。
【０００６】
【発明が解決しようとする課題】
しかしながら、図７のスロットルバルブ８の正面図に示すように、スロットルバルブ８と吸気管７との隙間が大きい上下部分２２からは新気が多く流入してＥＧＲ導入部９へ流れていくが、スロットルバルブ８と吸気管７との隙間が少ないスロットルバルブ８の軸１５を中心とした中央部分１７より下流では流れが生じにくく、特にスロットルバルブ８の開度が低い状態では、ＥＧＲ導入部９から流入した排気ガスが前記中央部分１７の後方で図５に示す矢印Ｅのように逆流することがあり、大量のＥＧＲが導入されるエンジンではＥＧＲによる排気ガスが逆流してスロットルバルブ８に達し、運転時間が延びるに従ってＥＧＲを導入している時間が増えるためスロットルバルブ８を汚損することがあった。
【０００７】
本発明は、上記の点に鑑みてなされたもので、ＥＧＲにより流入する排気ガスの逆流を防止してスロットルバルブの汚損を防止することができるようにした、排気ガス還流装置用排気ガス導入部構造を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１の本発明の排気ガス還流装置用排気ガス導入部構造は、排気通路内の排気ガスを吸気通路内に還流させる排気ガス還流通路と、上記吸気通路に設けられたスロットルバルブの下流側に配設されると共に上記排気ガス還流通路に接続されたＥＧＲ導入部とを備え、上記スロットルバルブは、開閉のための軸を有し、上記ＥＧＲ導入部は、上記吸気通路の内周に亘って形成され上記排気ガス還流通路からの排気ガスを該吸気通路の下流側に導く排気ガス流入路と、上記スロットルバルブにより生じる上記吸気通路内の吸気流の強い主流部分に上記排気ガス還流通路からの排気ガスが導かれるように、上記排気ガス流入路の上記軸を含む上記スロットルバルブの中心部分の下流側をを閉塞する隔壁とを有することを特徴としている。これによって、排気ガスを吸気主流に導くことができ、吸気との混合が促進されるとともに排気ガスが逆流され難くなる。
請求項２の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項１記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス流入路は、上記吸気通路を形成する吸気管に沿って設けられるアウタリングと、一端が該アウタリングの上流側に接合され他端が該アウタリングの内壁から離隔されたインナリングとから構成され、上記隔壁は上記アウタリングと上記インナリングとの間に装架されたことを特徴としている。
請求項３の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項２記載の排気ガス還流装置用排気ガス導入部構造において、上記アウタリングの外周には、上記排気ガス流入路内に上記排気ガス還流通路からの排気ガスを導く複数の孔部が形成されていることを特徴としている。
【０００９】
請求項４の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項１〜３の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス還流通路は、上記吸気通路の外周に亘って設けられた環状通路を有し、上記排気ガスは該環状通路を介して上記排気ガス流入路に導かれることを特徴としている。
さらに、請求項５の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項１〜４の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス流入路から上記吸気通路内に流入した上記排気ガスが上記吸気流の強い主流部分以外に流れることを規制する逆流規制部材を備え、該逆流規制部材は、上記軸を含む上記スロットルバルブの中心部分の下流側に位置することを特徴としている。これにより、排気ガスが吸気通路内の吸気主流以外に流れるのが規制され、排気ガスが吸気主流に効果的に導かれる。
請求項６の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項２〜４の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス流入路から上記吸気通路内に流入した上記排気ガスが上記吸気流の強い主流部分以外に流れることを規制する逆流規制部材を備え、該逆流規制部材は、上記軸を含む上記スロットルバルブの中心部分の下流側に位置し、上記隔壁が設けられた部分の上記インナリングを下流側に延長した延長部であることを特徴としている。
【００１０】
また、請求項７の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項１〜６の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス流入路と上記吸気通路との間に設けられ、上記排気ガス流入路から上記吸気通路へ流入する直前の吸気の流れに乱れを発生させる乱れ発生部材をさらに備えたことを特徴としている。これにより、吸気に乱れを生じさせ、排気ガスが吸気に導入されやすくなり排気ガスを吸気に均一に混入することができる。
請求項８の本発明の排気ガス還流装置用排気ガス導入部構造は、請求項２〜６の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造において、上記排気ガス流入路と上記吸気通路との間に設けられ、吸気の流れに乱れを発生させる乱れ発生部材をさらに備え、該乱れ発生部材は、上記隔壁が設けられていない部分の上記インナリングから上記吸気管の中心に向かって突出する突起板であることを特徴としている。
【００１１】
【発明の実施の形態】
以下、図面により本発明の実施の形態について説明する。
図１は本発明の第１実施形態としての排気ガス還流装置用排気ガス導入部構造を示し、図２は本発明の第２実施形態としての排気ガス還流装置用排気ガス導入部構造を示し、図３は本発明の第３実施形態としての排気ガス還流装置用排気ガス導入部構造を示す。なお、図１〜図３において、従来技術（図６参照）と同一の部材には同一符号を付して詳細な説明を省略する。
【００１２】
まず、図１を参照して本発明の第１実施形態について説明する。
本構造にかかるＥＧＲ導入部（排気ガス導入部）９は、図４に示すように、排気通路３内の排気ガスを吸気通路２に還流させるためのＥＧＲ通路４の下流端にそなえられ、このＥＧＲ導入部９周囲には、図５に示すように、環状通路１０が設けられ、ＥＧＲ通路４から導入される排気ガスが開口部１１から環状通路１０を通じてＥＧＲ導入部９に導かれるように構成されている。
【００１３】
本ＥＧＲ導入部９は、図１に示すように、周上にほぼ等間隔に複数の孔部１２が形成されたアウタリング１３と、一端がアウタリング１３上流側の内壁に全周に渡り接合され他端がアウタリング１３内壁から離隔しているインナリング１４と、インナリング１４の他端において互いに離隔したインナリング１４とアウタリング１３との間に装架される隔壁１８とから構成される。
【００１４】
隔壁１８は、図１（Ｂ）に示すように、アウタリング１３とインナリング１４との隙間のうち左右の離隔部分を塞ぐように形成されている。この隔壁１８の設置位置は、ＥＧＲ導入部９が吸気管７に接続された状態でＥＧＲ導入部９の直上流に位置するスロットルバルブ８の軸１５を中心とした中央部分１７（図７参照）と対応する位置、即ち、中央部分１７からの新気の流れが流入する位置である。また、アウタリング１３とインナリング１４の上下方向の離隔部分は解放され、排気ガス流入路１９を形成している。
【００１５】
本発明の第１実施形態としての排気ガス還流装置用排気ガス導入部構造は、このように構成されるため、ＥＧＲ導入部９では、排気ガス流入路１９により、新気の流れの強いスロットルバルブ８の上下部分２２（図７参照）の下流側からのみ排気ガスが流出して、排気ガスが吸気の主流部分に導入されるようになり、流れの弱い中央部分１７の下流側からの排気ガスの流出は隔壁１８により規制されるので、流れの弱い中央部分１７の下流側で吸気のスロットル側への逆流が発生しても逆流への排気ガスの混入を大幅に減少させることができ、バルブの汚損を防ぐことができる。
【００１６】
次に、図２を参照して本発明の第２実施形態について説明する。
第２実施形態としての排気ガス導入部（ＥＧＲ導入部）構造では、図２に示すように、第１実施形態の排気ガス導入部構造に加えて、隔壁１８の形成された部分のインナリング１４を下流側に延長した逆流規制部材としての延長部２０が設けられている。
【００１７】
したがって、本発明の第２実施形態としての排気ガス還流装置用排気ガス導入部構造によれば、第１実施形態の効果に加えて、吸気管７の壁面周囲に沿って逆流してきた排気ガスやインテークマニホールド２から逆流してきたブローバイガスが延長部２０によりスロットルバルブ８まで逆流することが規制され、より効果的にスロットルバルブ８の汚損を防ぐことが可能となる。
【００１８】
次に、図３を参照して本発明の第３実施形態について説明する。
第３実施形態としての排気ガス導入部（ＥＧＲ導入部）構造では、図３に示すように、第２実施形態の排気ガス導入部構造に加えて、隔壁１８の設けられていないアウタリング１３とインナリング１４とが離隔した部分に、インナリング１４から吸気管７の中心に向かい突出して吸気流に乱れを発生させる乱れ発生部材としての突起板２１が設けられている。
【００１９】
したがって、本発明の第３実施形態としての排気ガス還流装置用排気ガス導入部構造によれば、流れの強いスロットルバルブ８の上下部分２２の下流側に設けられた突起板２１により、吸気の流れが乱されてＥＧＲ導入部から導入される排気ガスが新気の流れに導入されやすくなる。これにより、還流排気ガスの逆流を防ぐとともに、ＥＧＲによる排気ガスを新気に均一に混合することが可能となって、効果的にスロットルバルブ８の汚損を防ぐことが可能となり、さらには、ＥＧＲによる排気ガス混入濃度の気筒管のばらつきを抑えて燃焼を安定にするとともにドライバビリティを確保することが可能となる。またＥＧＲ本来の効果である排気ガス中のＮＯｘ低減効果も十分達成される。
【００２０】
なお、上記第１実施形態に示した排気ガス流入路１９、第２実施形態に示した延長部２０、第３実施形態に示した突起板２１をそれぞれ単独あるいは任意に組み合わせてＥＧＲ導入部９に適用しても上述と同様スロットルバルブ８の汚損を防止することができるという利点を有するものである。
【００２１】
【発明の効果】
以上詳述したように、請求項１の本発明の排気ガス還流装置用排気ガス導入部構造によれば、吸気通路側に流入する排気ガスを吸気通路内の吸気流の強い主流部分に導く排気ガス流入路と隔壁とを備えているため、排気ガスは吸気の主流に導入され、吸気との混合が促進されるとともに排気ガスが逆流され難くなる。この結果、上流側にスロットルバルブ等を設置してある場合には、このバルブの汚損を防止することが可能となる。
【００２２】
さらに、請求項５及び６の本発明では、排気ガスが吸気の主流部分以外に流れることを規制する逆流規制部材を備えているので、排気ガスが吸気通路内の吸気主流以外に流れるのが規制されて排気ガスを吸気主流に効果的に導くことが可能となる。
また、請求項７及び８の本発明では、吸気の流れに乱れを発生させる乱れ発生部材をさらに備えたことを特徴としているので、排気ガスが吸気の流れに導入されやすくなって逆流を防ぐとともに、ＥＧＲによる排気ガスを吸気に均一に混合することが可能となる。それによって効果的にスロットルバルブの汚損を防ぐことが可能となるとともに、ＥＧＲによる排気ガス混入濃度の気筒管のばらつきを抑えて燃焼を安定にするとともにドライバビリティを確保することが可能となる。
【図面の簡単な説明】
【図１】本発明の第１実施形態としての排気ガス導入部構造を示す図であり、（Ａ）はその側面図、（Ｂ）はその正面図である。
【図２】本発明の第２実施形態としての排気ガス導入部構造を示す図であり、（Ａ）はその側面図、（Ｂ）はその正面図である。
【図３】本発明の第３実施形態としての排気ガス導入部構造を示す図であり、（Ａ）はその側面図、（Ｂ）はその正面図である。
【図４】従来の一般的な排気ガス還流装置を備えたエンジンの模式図である。
【図５】従来の排気ガス還流装置の要部断面図（図４のＡ−Ａ矢視断面図）である。
【図６】従来の排気ガス導入部構造を示す図であり、（Ａ）はその側面図、（Ｂ）はその断面図〔図６（Ａ）のＢ−Ｂ矢視断面図〕である。
【図７】一般に排気ガス還流装置の上流側にそなえられるスロットルバルブの正面図である。
【符号の説明】
２ 吸気通路
３ 排気通路
４ 排気ガス還流通路（ＥＧＲ通路）
７ 吸気管
８ スロットルバルブ
９ ＥＧＲ導入部
１１ 開口部
１２ 孔部
１３ アウタリング
１４ インナリング
１８ 隔壁
１９ 排気ガス流入路
２０ 延長部（逆流規制部材）
２１ 突起板（乱れ発生部材）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust gas recirculation device that returns a part of exhaust gas to an intake system in an internal combustion engine such as an automobile, and more particularly to an exhaust gas introduction structure for an exhaust gas recirculation device.
[0002]
[Prior art]
In order to effectively suppress NOx in exhaust gas, an exhaust gas recirculation (EGR: Exhaust Gas Recirculation) device for returning a part of the exhaust gas to the intake passage side is often used for automobile engines.
FIG. 4 is a diagram showing a configuration of the entire engine provided with a conventional general EGR device. The engine body 1 includes an intake passage (intake manifold) 2 for supplying air into each cylinder, an exhaust passage (exhaust manifold) 3 for exhausting exhaust gas from each cylinder, and exhaust gas in the exhaust passage 3 into the intake passage 2. An EGR passage 4 for recirculation, an EGR valve 5 for adjusting the amount of exhaust gas recirculated into the intake passage 2, and a surge tank 6 provided at the upstream end of the intake passage are connected.
[0003]
FIG. 5 shows a cross section taken along line AA in FIG. As shown in FIG. 5, fresh air (air introduced from the outside air) indicated by an arrow C that has passed through the throttle valve 8 inside the intake pipe 7 upstream of the surge tank 6 passes through the EGR introduction part 9, and then enters the surge tank. 6 and is sent to each cylinder through the intake manifold 2. An annular passage 10 is provided around the EGR introduction portion 9, and exhaust gas introduced from the EGR passage 4 is guided from the opening portion 11 to the EGR introduction portion 9 through the annular passage 10.
[0004]
Then, as shown in the side view of FIG. 6A and the cross-sectional view of FIG. 6B [the BB cross-sectional view of FIG. 3A], the EGR introduction portions 9 are arranged at substantially equal intervals on the circumference. An outer ring 13 having a plurality of holes 12 and an inner ring 14 having one end joined to the inner wall on the upstream side of the outer ring 13 and the other end spaced apart from the inner wall of the outer ring 13. Yes.
[0005]
When a part of the exhaust gas discharged from the exhaust manifold 3 enters the annular passage 10 through the EGR passage 4, it is located between the outer ring 13 and the inner ring 14 through the hole 12 formed in the outer ring 13 of the EGR introduction portion 9. And is introduced into the intake pipe 7 as indicated by an arrow D shown in FIG. 5 and mixed into fresh air.
[0006]
[Problems to be solved by the invention]
However, as shown in the front view of the throttle valve 8 in FIG. 7, a large amount of fresh air flows from the upper and lower portions 22 where the gap between the throttle valve 8 and the intake pipe 7 is large and flows to the EGR introduction portion 9. A flow is unlikely to occur downstream of the central portion 17 centering on the shaft 15 of the throttle valve 8 where the clearance between the throttle valve 8 and the intake pipe 7 is small. Especially when the opening of the throttle valve 8 is low, the EGR introduction portion 9 The inflowing exhaust gas may flow backward as indicated by an arrow E shown in FIG. 5 behind the central portion 17. In an engine in which a large amount of EGR is introduced, the exhaust gas due to EGR flows backward and reaches the throttle valve 8. Since the time during which EGR is introduced increases as the operation time increases, the throttle valve 8 may be soiled.
[0007]
The present invention has been made in view of the above points, and an exhaust gas recirculation device for an exhaust gas recirculation device that prevents backflow of exhaust gas flowing in by EGR and prevents fouling of a throttle valve. The purpose is to provide a structure.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an exhaust gas introduction part structure for an exhaust gas recirculation device according to the present invention of claim 1 is provided in an exhaust gas recirculation passage for recirculating exhaust gas in the exhaust passage into the intake passage, and in the intake passage. And an EGR introduction portion that is disposed downstream of the throttle valve and connected to the exhaust gas recirculation passage. The throttle valve has a shaft for opening and closing, and the EGR introduction portion includes the EGR introduction portion. An exhaust gas inflow passage that is formed over the inner periphery of the intake passage and guides exhaust gas from the exhaust gas recirculation passage to the downstream side of the intake passage, and a main flow portion with a strong intake flow in the intake passage generated by the throttle valve to as exhaust gas from the exhaust gas recirculation passage is introduced, to have a partition wall for closing the downstream side of the central portion of the throttle valve including the axis of the exhaust gas inflow channel It is characterized. As a result, the exhaust gas can be guided to the main intake air stream, and mixing with the intake air is promoted and the exhaust gas is less likely to flow backward.
An exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to a second aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to the first aspect, wherein the exhaust gas inflow passage forms an intake passage that forms the intake passage. An outer ring provided along the pipe, and an inner ring having one end joined to the upstream side of the outer ring and the other end spaced apart from the inner wall of the outer ring, and the partition includes the outer ring and the inner ring It is characterized by being mounted between.
An exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to a third aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to the second aspect, wherein an outer periphery of the outer ring is disposed in the exhaust gas inflow path. And a plurality of holes for guiding the exhaust gas from the exhaust gas recirculation passage.
[0009]
Exhaust gas inlet structure for an exhaust gas recirculation system of the present invention 請 Motomeko 4 is the exhaust gas inlet structure for an exhaust gas recirculation system according to any one of claim 1 to 3, wherein the exhaust gas recirculation passage Has an annular passage provided over the outer periphery of the intake passage, and the exhaust gas is guided to the exhaust gas inflow passage through the annular passage.
Furthermore, an exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to a fifth aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 1 to 4 , wherein the exhaust gas inflow A reverse flow restricting member that restricts the exhaust gas flowing into the intake passage from the passage from flowing to a portion other than the main flow portion where the intake flow is strong , and the reverse flow restricting member includes a central portion of the throttle valve including the shaft. It is characterized by being located on the downstream side . As a result, the exhaust gas is restricted from flowing other than the intake main flow in the intake passage, and the exhaust gas is effectively guided to the intake main flow.
An exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to a sixth aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 2 to 4 , wherein A reverse flow restricting member for restricting the exhaust gas flowing into the intake passage from flowing to a portion other than the main flow portion where the intake flow is strong, and the reverse flow restricting member is located downstream of the central portion of the throttle valve including the shaft. It is an extension part which extended the said inner ring of the part provided in the said partition to the downstream.
[0010]
An exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to a seventh aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 1 to 6 , wherein And a turbulence generating member that is provided between the passage and the intake passage and generates turbulence in the flow of intake air just before flowing into the intake passage from the exhaust gas inflow passage. As a result, the intake air is disturbed and the exhaust gas is easily introduced into the intake air, so that the exhaust gas can be uniformly mixed into the intake air.
An exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to an eighth aspect of the present invention is the exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 2 to 6 , wherein A turbulence generating member provided between the intake passage and generating turbulence in the flow of intake air is further provided, and the turbulence generating member extends from the inner ring of the portion where the partition wall is not provided to the center of the intake pipe. It is characterized by being a protruding plate projecting toward it.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an exhaust gas introduction part structure for an exhaust gas recirculation apparatus as a first embodiment of the present invention, FIG. 2 shows an exhaust gas introduction part structure for an exhaust gas recirculation apparatus as a second embodiment of the present invention, FIG. 3 shows an exhaust gas introduction part structure for an exhaust gas recirculation device as a third embodiment of the present invention. 1 to 3, the same members as those in the prior art (see FIG. 6) are denoted by the same reference numerals, and detailed description thereof is omitted.
[0012]
First, a first embodiment of the present invention will be described with reference to FIG.
An EGR introduction portion (exhaust gas introduction portion) 9 according to this structure is provided at the downstream end of the EGR passage 4 for returning the exhaust gas in the exhaust passage 3 to the intake passage 2, as shown in FIG. As shown in FIG. 5, an annular passage 10 is provided around the EGR introduction portion 9, and exhaust gas introduced from the EGR passage 4 is guided from the opening 11 to the EGR introduction portion 9 through the annular passage 10. Has been.
[0013]
As shown in FIG. 1, the present EGR introduction portion 9 includes an outer ring 13 having a plurality of holes 12 formed at substantially equal intervals on the circumference, and one end joined to the inner wall on the upstream side of the outer ring 13 over the entire circumference. The other end of the inner ring 14 is separated from the inner wall of the outer ring 13, and the inner ring 14 is separated from the inner ring 14 at the other end of the inner ring 14 and the partition 18 is mounted between the outer ring 13. .
[0014]
As shown in FIG. 1B, the partition wall 18 is formed so as to block the left and right separated portions in the gap between the outer ring 13 and the inner ring 14. The partition 18 is installed at a central portion 17 centering on the shaft 15 of the throttle valve 8 located immediately upstream of the EGR introduction portion 9 in a state where the EGR introduction portion 9 is connected to the intake pipe 7 (see FIG. 7). That is, a position where a flow of fresh air from the central portion 17 flows. Further, the vertically spaced apart portions of the outer ring 13 and the inner ring 14 are released to form an exhaust gas inflow passage 19.
[0015]
Since the exhaust gas recirculation device structure for the exhaust gas recirculation device according to the first embodiment of the present invention is configured as described above, the EGR introduction unit 9 has a throttle valve with a strong fresh air flow through the exhaust gas inflow passage 19. The exhaust gas flows out only from the downstream side of the upper and lower portions 22 (see FIG. 7), and the exhaust gas is introduced into the mainstream portion of the intake air, so that the exhaust gas from the downstream side of the weak central portion 17 flows. Since the outflow of air is regulated by the partition wall 18, even if a reverse flow to the throttle side of the intake air occurs downstream of the weak central portion 17, the mixture of exhaust gas into the reverse flow can be greatly reduced. Can be prevented from fouling.
[0016]
Next, a second embodiment of the present invention will be described with reference to FIG.
In the exhaust gas introduction part (EGR introduction part) structure as the second embodiment, as shown in FIG. 2, in addition to the exhaust gas introduction part structure of the first embodiment, the inner ring 14 in the portion where the partition wall 18 is formed. An extension portion 20 is provided as a backflow restricting member extending to the downstream side.
[0017]
Therefore, according to the exhaust gas introducing portion structure for the exhaust gas recirculation device as the second embodiment of the present invention, in addition to the effects of the first embodiment, the exhaust gas flowing back along the periphery of the wall surface of the intake pipe 7 The blow-by gas that has flowed back from the intake manifold 2 is restricted from flowing back to the throttle valve 8 by the extension portion 20, so that the throttle valve 8 can be more effectively prevented from being contaminated.
[0018]
Next, a third embodiment of the present invention will be described with reference to FIG.
In the exhaust gas introduction part (EGR introduction part) structure as the third embodiment, as shown in FIG. 3, in addition to the exhaust gas introduction part structure of the second embodiment, the outer ring 13 without the partition wall 18 is provided. A protruding plate 21 serving as a turbulence generating member that protrudes from the inner ring 14 toward the center of the intake pipe 7 and generates turbulence in the intake air flow is provided at a portion separated from the inner ring 14.
[0019]
Therefore, according to the exhaust gas recirculation device for exhaust gas recirculation device as the third embodiment of the present invention, the flow of intake air is caused by the projection plate 21 provided on the downstream side of the upper and lower portions 22 of the throttle valve 8 having a strong flow. Is disturbed and the exhaust gas introduced from the EGR introduction part is easily introduced into the flow of fresh air. As a result, the backflow of the recirculated exhaust gas can be prevented, the exhaust gas by EGR can be uniformly mixed with fresh air, and the throttle valve 8 can be effectively prevented from being polluted. It is possible to stabilize the combustion and to ensure the drivability by suppressing the variation of the exhaust gas mixture concentration due to the cylinder tube. Moreover, the NOx reduction effect in exhaust gas, which is the original effect of EGR, can be sufficiently achieved.
[0020]
Note that the exhaust gas inflow passage 19 shown in the first embodiment, the extension 20 shown in the second embodiment, and the protruding plate 21 shown in the third embodiment are individually or arbitrarily combined into the EGR introduction section 9. Even when applied, the throttle valve 8 can be prevented from being soiled as described above.
[0021]
【The invention's effect】
As described in detail above, according to the exhaust gas recirculation device for exhaust gas recirculation apparatus of the first aspect of the present invention, the exhaust gas flowing into the intake passage is led to the main flow portion where the intake flow is strong in the intake passage. Since the gas inflow path and the partition wall are provided, the exhaust gas is introduced into the main flow of the intake air, and mixing with the intake air is promoted and the exhaust gas is difficult to flow back. As a result, when a throttle valve or the like is installed on the upstream side, it is possible to prevent the valve from being contaminated.
[0022]
Further, in the present invention according to claims 5 and 6, since a backflow restricting member for restricting the flow of exhaust gas to other than the main flow portion of the intake air is provided, the flow of exhaust gas to other than the main flow of intake air in the intake passage is restricted. As a result, the exhaust gas can be effectively guided to the intake mainstream.
Further, the present invention according to claims 7 and 8 is characterized by further comprising a turbulence generating member that generates turbulence in the flow of intake air, so that exhaust gas is easily introduced into the flow of intake air and prevents backflow. , EGR exhaust gas can be uniformly mixed with the intake air. As a result, it becomes possible to effectively prevent the throttle valve from being polluted, to suppress the variation of the exhaust gas mixture concentration due to EGR, and to stabilize the combustion and to ensure the drivability.
[Brief description of the drawings]
1A and 1B are views showing an exhaust gas introducing portion structure as a first embodiment of the present invention, in which FIG. 1A is a side view thereof, and FIG. 1B is a front view thereof.
FIGS. 2A and 2B are views showing an exhaust gas introducing portion structure as a second embodiment of the present invention, in which FIG. 2A is a side view thereof, and FIG. 2B is a front view thereof.
FIGS. 3A and 3B are views showing an exhaust gas introduction portion structure as a third embodiment of the present invention, in which FIG. 3A is a side view thereof, and FIG. 3B is a front view thereof.
FIG. 4 is a schematic view of an engine equipped with a conventional general exhaust gas recirculation device.
FIG. 5 is a cross-sectional view of a main part of a conventional exhaust gas recirculation device (a cross-sectional view taken along line AA in FIG. 4).
6A and 6B are diagrams showing a conventional exhaust gas introduction portion structure, in which FIG. 6A is a side view thereof, and FIG. 6B is a cross-sectional view thereof [a cross-sectional view taken along line BB in FIG.
FIG. 7 is a front view of a throttle valve generally provided on the upstream side of the exhaust gas recirculation device.
[Explanation of symbols]
2 Intake passage 3 Exhaust passage 4 Exhaust gas recirculation passage (EGR passage)
7 Intake pipe 8 Throttle valve 9 EGR introduction part 11 Opening part 12 Hole part 13 Outer ring 14 Inner ring 18 Bulkhead 19 Exhaust gas inflow path 20 Extension part (back flow restricting member)
21 Protrusion plate (disturbance generating member)

Claims (8)

排気通路内の排気ガスを吸気通路内に還流させる排気ガス還流通路と、
上記吸気通路に設けられたスロットルバルブの下流側に配設されると共に上記排気ガス還流通路に接続されたＥＧＲ導入部とを備え、
上記スロットルバルブは、開閉のための軸を有し、
上記ＥＧＲ導入部は、上記吸気通路の内周に亘って形成され上記排気ガス還流通路からの排気ガスを該吸気通路の下流側に導く排気ガス流入路と、上記スロットルバルブにより生じる上記吸気通路内の吸気流の強い主流部分に上記排気ガス還流通路からの排気ガスが導かれるように、上記排気ガス流入路の上記軸を含む上記スロットルバルブの中心部分の下流側を閉塞する隔壁とを有することを特徴とする、排気ガス還流装置用排気ガス導入部構造。An exhaust gas recirculation passage for recirculating exhaust gas in the exhaust passage into the intake passage;
An EGR introduction portion disposed on the downstream side of the throttle valve provided in the intake passage and connected to the exhaust gas recirculation passage,
The throttle valve has a shaft for opening and closing,
The EGR introduction portion is formed over the inner periphery of the intake passage and leads to an exhaust gas inflow passage that leads exhaust gas from the exhaust gas recirculation passage to the downstream side of the intake passage, and an inside of the intake passage that is generated by the throttle valve. A partition wall that blocks the downstream side of the central portion of the throttle valve including the shaft of the exhaust gas inflow passage so that the exhaust gas from the exhaust gas recirculation passage is guided to the main flow portion where the intake air flow is strong. An exhaust gas introduction structure for an exhaust gas recirculation device. 上記排気ガス流入路は、上記吸気通路を形成する吸気管に沿って設けられるアウタリングと、一端が該アウタリングの上流側に接合され他端が該アウタリングの内壁から離隔されたインナリングとから構成され、上記隔壁は上記アウタリングと上記インナリングとの間に装架されたことを特徴とする、請求項１記載の排気ガス還流装置用排気ガス導入部構造。  The exhaust gas inflow passage includes an outer ring provided along an intake pipe forming the intake passage, an inner ring having one end joined to the upstream side of the outer ring and the other end separated from the inner wall of the outer ring. The exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to claim 1, wherein the partition wall is mounted between the outer ring and the inner ring. 上記アウタリングの外周には、上記排気ガス流入路内に上記排気ガス還流通路からの排気ガスを導く複数の孔部が形成されていることを特徴とする、請求項２記載の排気ガス還流装置用排気ガス導入部構造。  The exhaust gas recirculation device according to claim 2, wherein a plurality of holes for guiding exhaust gas from the exhaust gas recirculation passage are formed in the exhaust gas inflow passage on an outer periphery of the outer ring. Exhaust gas introduction part structure. 上記排気ガス還流通路は、上記吸気通路の外周に亘って設けられた環状通路を有し、上記排気ガスは該環状通路を介して上記排気ガス流入路に導かれることを特徴とする、請求項１〜３の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造。The exhaust gas recirculation passage has an annular passage provided over an outer periphery of the intake passage, and the exhaust gas is guided to the exhaust gas inflow passage through the annular passage. The exhaust gas introduction part structure for an exhaust gas recirculation device according to any one of 1 to 3 . 上記排気ガス流入路から上記吸気通路内に流入した上記排気ガスが上記吸気流の強い主流部分以外に流れることを規制する逆流規制部材を備え、該逆流規制部材は、上記軸を含む上記スロットルバルブの中心部分の下流側に位置することを特徴とする、請求項１〜４の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造。A reverse flow restricting member that restricts the exhaust gas flowing into the intake passage from the exhaust gas inflow passage from flowing to a portion other than the main flow portion where the intake flow is strong , and the reverse flow restricting member includes the throttle valve including the shaft The exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 1 to 4 , wherein the exhaust gas introduction part structure is located downstream of a central portion of the exhaust gas recirculation apparatus. 上記排気ガス流入路から上記吸気通路内に流入した上記排気ガスが上記吸気流の強い主流部分以外に流れることを規制する逆流規制部材を備え、該逆流規制部材は、上記軸を含む上記スロットルバルブの中心部分の下流側に位置し、上記隔壁が設けられた部分の上記インナリングを下流側に延長した延長部であることを特徴とする、請求項２〜４の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造。A reverse flow restricting member that restricts the exhaust gas flowing into the intake passage from the exhaust gas inflow passage from flowing to a portion other than the main flow portion where the intake flow is strong, and the reverse flow restricting member includes the throttle valve including the shaft of located downstream of the central portion, characterized in that it is an extension that extends the inner ring of the portion where the partition wall is provided on the downstream side, according to any one of claims 2-4 Exhaust gas introduction part structure for exhaust gas recirculation device. 上記排気ガス流入路と上記吸気通路との間に設けられ、上記排気ガス流入路から上記吸気通路へ流入する直前の吸気の流れに乱れを発生させる乱れ発生部材をさらに備えたことを特徴とする、請求項１〜６の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造。A turbulence generating member is provided between the exhaust gas inflow passage and the intake passage, and generates a turbulence in the flow of intake air just before flowing into the intake passage from the exhaust gas inflow passage. The exhaust gas introduction part structure for an exhaust gas recirculation device according to any one of claims 1 to 6 . 上記排気ガス流入路と上記吸気通路との間に設けられ、吸気の流れに乱れを発生させる乱れ発生部材をさらに備え、該乱れ発生部材は、上記隔壁が設けられていない部分の上記インナリングから上記吸気管の中心に向かって突出する突起板であることを特徴とする、請求項２〜６の何れか１項に記載の排気ガス還流装置用排気ガス導入部構造。A turbulence generating member is provided between the exhaust gas inflow passage and the intake passage and generates turbulence in the flow of intake air, and the turbulence generation member is formed from the inner ring in a portion where the partition wall is not provided. The exhaust gas introduction part structure for an exhaust gas recirculation apparatus according to any one of claims 2 to 6 , wherein the exhaust gas recirculation apparatus has a projecting plate projecting toward the center of the intake pipe.
JP25086298A 1998-09-04 1998-09-04 Exhaust gas introduction structure for exhaust gas recirculation system Expired - Fee Related JP3674329B2 (en)

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JP2002180913A (en) * 2000-12-08 2002-06-26 Yamaha Motor Co Ltd Egr structure
ITBO20010761A1 (en) * 2001-12-14 2003-06-16 Magneti Marelli Powertrain Spa INTAKE MANIFOLD FOR AN INTERNAL COMBUSTION ENGINE PROVIDED WITH EXHAUST GAS RECIRCULATION
JP4552663B2 (en) * 2005-01-21 2010-09-29 株式会社豊田自動織機 Engine intake system
FR2896546B1 (en) * 2006-01-23 2012-12-21 Peugeot Citroen Automobiles Sa DEVICE FOR RECYCLING EXHAUST GAS FROM A MOTOR VEHICLE
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