JP3378659B2 - Connection structure of exhaust gas recirculation device - Google Patents
Connection structure of exhaust gas recirculation deviceInfo
- Publication number
- JP3378659B2 JP3378659B2 JP17181394A JP17181394A JP3378659B2 JP 3378659 B2 JP3378659 B2 JP 3378659B2 JP 17181394 A JP17181394 A JP 17181394A JP 17181394 A JP17181394 A JP 17181394A JP 3378659 B2 JP3378659 B2 JP 3378659B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- connector
- intake manifold
- gas pipe
- bent portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/08—Thermoplastics
-
- 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
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は内燃機関の排気ガス再
循環装置（以下ＥＧＲと略称する。）における、排気ガ
ス管のインテークマニホルドへの接続構造に関する。
【０００２】
【従来の技術】ＥＧＲは排気ガスの一部をインテークマ
ニホルドに取り入れることにより、内燃機関の排出ガス
の無公害化をはかるものであり、排気ガスの一部を排気
管から排気ガス管によりインテークマニホルドに流入さ
せ、吸入空気に混入させている。その流入位置はインテ
ークマニホルドの各気筒毎への分岐の上流で空気流量の
多い位置である。この部分の接続構造例を図３に示す。
【０００３】インテークマニホルド１１は軽量化等の目
的で合成樹脂製とされ、その開口１２に、金属パイプで
なる排気ガス管１４が、コネクタ１３を介して取り付け
られている。コネクタ１３はステンレス鋼等の金属でな
り、排気ガス管１４に溶接され、インテークマニホルド
１１への取付けは、インテークマニホルド１１にインサ
ートされたナット１５とボルト１６とにより、パッキン
１７を介して締付けによってなされる。排気ガスは矢印
Ｇのようにインテークマニホルド１１の内部１８に流入
し吸入空気（矢印Ａ）に混入する。
【０００４】
【発明が解決しようとする課題】矢印Ｇのように流入す
る排気ガスは高温（１５０℃〜６５０℃）であって、排
気ガス管１４からコネクタ１３を介してインテークマニ
ホルド１１へ熱が伝わる。インテークマニホルド１１は
合成樹脂製であってこの熱に耐えられずコネクタ１３を
取付けた部分が熱変形し、取付部に隙間ができて、取付
ガタを生じたり、隙間から空気が流入して吸入空気量が
変化しエンジン出力を低下させたりする。コネクタ１３
には屈曲部１９を設けて放熱をはかっているが、これだ
けでは不十分である。
【０００５】
【課題を解決するための手段】この発明はＥＧＲの排気
ガス管と合成樹脂製のインテークマニホルドとの間に介
在させる環状のコネクタの排気ガス管に近接した部分を
排気ガス管の外面との間に間隙を空けて筒状の屈曲部を
形成するとともに、該屈曲部の端部と排気ガス管の端部
とを接合し、さらにコネクタの屈曲部の外周面に放熱フ
ィンを設け、該放熱フィンおよび屈曲部をインテークマ
ニホルド内側の吸入空気流路に臨ませて配置したもので
ある。
【０００６】
【作用】排気ガスは排気ガス管から流入し、コネクタへ
熱を伝えるが、コネクタの屈曲部外周面に放熱フィンが
あり、これがインテークマニホルド内側の吸入空気流路
内に臨むように設けられているから、排気ガスの熱は放
熱フィンから吸入空気中に放出される。従ってコネクタ
外周部のインテークマニホルドに取付けられる部分から
伝わる熱量は少なく、インテークマニホルドが熱変形を
起こすには至らない。
【０００７】
【実施例】図１に実施例を示す。内燃機関の合成樹脂製
インテークマニホルド１は、その壁面開口２にコネクタ
３を介在させて排気ガス管４が取付けられている。開口
２はインテークマニホルド１が各気筒へ分岐する上流側
の、吸入空気（矢印Ａ）流量が多い位置に設ける。排気
ガス管４は、基端が内燃機関の排気管（図示しない）に
接続され、末端部はコネクタ３の内周側（後述の屈曲部
７下端部）に溶接される。コネクタ３の外周側は適宜個
数のボルト６によってインテークマニホルド１の開口２
の周縁に締付けられる。
【０００８】コネクタ３の中間部は屈曲部７となって筒
状になっており、排気ガス管４外面との間に間隙が形成
されている。コネクタの内周部寄りで排気ガス管４に近
接した部分すなわち屈曲部７の下端部分外周面に、複数
の並行な放熱フィン５が環状に突出して形成されてい
る。放熱フィン５はインテークマニホルド１の内側の吸
入空気流路（矢印Ａ）に臨ませてある。コネクタ３は金
属製で、排気ガス管４とともにステンレス鋼を採用して
もよく、またアルミニウムを用いてもよく、材質は限定
されない。また図２に示すように図１の放熱フィン５と
ともにこれと直角で放射状の縦放熱フィン５ａを複数個
設けてもよい。
【０００９】コネクタ３はボルト６でインテークマニホ
ルド１成形の際埋め込まれたインサートナット８に締め
付けられ、パッキン９を介してコネクタ３の外周部が固
着される。
【００１０】排気ガスは矢印Ｇのように排気ガス管４内
を流れて空気流路１０で吸入空気（矢印Ａ）に混入す
る。排気ガスの熱は排気ガス管４からコネクタ３へ伝わ
るが、放熱フィン５又は放熱フィン５および５ａによっ
て吸入空気に熱を放出し、コネクタ３の外周部へ伝わる
熱量は少なく、インテークマニホルド１の接続部分が熱
によって変形することはない。
【００１１】
【発明の効果】この発明のＥＧＲの接続構造では、イン
テークマニホールド内側の吸入空気流 路内に臨ませたコ
ネクタの屈曲部外周面に設けた放熱フィンにより排気ガ
スの熱が吸入空気中に放出されるので、コネクタから合
成樹脂製のインテークマニホルドへ伝わる熱量は少な
く、インテークマニホルドの熱影響による取付ゆるみや
隙間洩れが無くなる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting an exhaust gas pipe to an intake manifold in an exhaust gas recirculation system (hereinafter abbreviated as EGR) of an internal combustion engine. 2. Description of the Related Art EGR is designed to make exhaust gas of an internal combustion engine non-polluting by introducing a part of the exhaust gas into an intake manifold. To make it flow into the intake manifold and mix into the intake air. The inflow position is a position where the air flow rate is large upstream of the branch of the intake manifold into each cylinder. FIG. 3 shows an example of a connection structure of this portion. [0003] The intake manifold 11 is made of synthetic resin for the purpose of weight reduction and the like, and an exhaust gas pipe 14 made of a metal pipe is attached to an opening 12 thereof through a connector 13. The connector 13 is made of a metal such as stainless steel, and is welded to the exhaust gas pipe 14. The connector 13 is attached to the intake manifold 11 by tightening via a packing 17 with a nut 15 and a bolt 16 inserted into the intake manifold 11. You. The exhaust gas flows into the interior 18 of the intake manifold 11 as shown by the arrow G and mixes with the intake air (arrow A). The exhaust gas flowing as indicated by the arrow G has a high temperature (150 ° C. to 650 ° C.), and heat is generated from the exhaust gas pipe 14 to the intake manifold 11 through the connector 13. Convey. The intake manifold 11 is made of a synthetic resin and cannot withstand the heat, and the portion where the connector 13 is mounted is thermally deformed, and a gap is formed in the mounting portion. The amount changes and the engine output decreases. Connector 13
Is provided with a bent portion 19 to dissipate heat, but this is not sufficient. [0005] Means for Solving the Problems] The part close to the exhaust gas pipe of the annular connector is interposed between the invention and the intake manifold made of EGR exhaust gas pipe and a synthetic resin
Leave a gap between the outer surface of the exhaust gas pipe and the cylindrical
And the end of the bent portion and the end of the exhaust gas pipe.
And a heat sink on the outer peripheral surface of the bent part of the connector.
And the radiation fins and the bent portion are arranged facing the intake air flow path inside the intake manifold. The exhaust gas flows from the exhaust gas pipe and transfers heat to the connector. There are radiating fins on the outer peripheral surface of the bent portion of the connector, and these fins serve as intake air flow paths inside the intake manifold.
Since it is provided so as to face inside, the heat of the exhaust gas is released from the radiation fins into the intake air. Therefore, the amount of heat transmitted from the portion of the connector outer peripheral portion attached to the intake manifold is small, and the intake manifold does not cause thermal deformation. FIG. 1 shows an embodiment. An intake manifold 1 made of a synthetic resin for an internal combustion engine has an exhaust gas pipe 4 attached to a wall opening 2 thereof with a connector 3 interposed therebetween. The opening 2 is provided at a position on the upstream side where the intake manifold 1 branches to each cylinder, where the flow rate of intake air (arrow A) is large. The exhaust gas pipe 4 has a proximal end connected to an exhaust pipe (not shown) of the internal combustion engine, and a distal end located on an inner peripheral side of the connector 3 (a bent portion described later).
7 lower end) . An outer peripheral side of the connector 3 is formed by an appropriate number of bolts 6 with an opening 2 of the intake manifold 1.
Is fastened to the periphery. The middle portion of the connector 3 has a bent portion 7 and has a cylindrical shape, and a gap is formed between the connector 3 and the outer surface of the exhaust gas pipe 4.
Have been. A plurality of parallel radiating fins 5 are formed to protrude annularly on a portion near the inner peripheral portion of the connector and close to the exhaust gas pipe 4, that is, on an outer peripheral surface of a lower end portion of the bent portion 7 . The radiation fins 5 face the intake air flow path (arrow A) inside the intake manifold 1. The connector 3 is made of metal, and stainless steel may be used together with the exhaust gas pipe 4 or aluminum may be used, and the material is not limited. Further, as shown in FIG. 2, a plurality of vertical radiating fins 5a may be provided at right angles to the radiating fin 5 of FIG. The connector 3 is tightened with a bolt 6 to an insert nut 8 embedded at the time of molding the intake manifold 1, and an outer peripheral portion of the connector 3 is fixed via a packing 9. The exhaust gas flows through the exhaust gas pipe 4 as shown by the arrow G and mixes with the intake air (arrow A) in the air flow path 10. Although the heat of the exhaust gas is transmitted from the exhaust gas pipe 4 to the connector 3, the heat is radiated to the intake air by the radiation fins 5 or the radiation fins 5 and 5 a, and the amount of heat transmitted to the outer peripheral portion of the connector 3 is small, and the connection of the intake manifold 1 is performed. The parts are not deformed by heat. [0011], according to the present invention in the connection structure of the EGR of the present invention, in
The heat of the exhaust gas is released into the intake air by the radiation fins provided on the outer peripheral surface of the bent portion of the connector facing the intake air flow path inside the take manifold. The amount of heat transmitted to the intake manifold is small, and there is no loose mounting or gap leakage due to the thermal influence of the intake manifold.
【図面の簡単な説明】 【図１】実施例の断面図 【図２】他の実施例の要部の斜視図 【図３】従来の接続構造の断面図 【符号の説明】 １ インテークマニホルド ３ コネクタ ４ 排気ガス管 ５ 放熱フィン[Brief description of the drawings] FIG. 1 is a sectional view of an embodiment. FIG. 2 is a perspective view of a main part of another embodiment. FIG. 3 is a cross-sectional view of a conventional connection structure. [Explanation of symbols] 1 Intake manifold 3 Connector 4 Exhaust gas pipe 5 Heat radiation fins
Claims (1)
ス管と合成樹脂製のインテークマニホルドとを環状のコ
ネクタを介在させて接続する接続構造において、コネク
タの排気ガス管に近接した部分を排気ガス管の外面との
間に間隙を空けて筒状の屈曲部を形成するとともに、該
屈曲部の端部と排気ガス管の端部とを接合し、さらにコ
ネクタの屈曲部の外周面に放熱フィンを設け、該放熱フ
ィンおよび屈曲部をインテークマニホルド内側の吸入空
気流路に臨ませて配置したことを特徴とする排気ガス再
循環装置の接続構造。(1) A connecting structure for connecting an exhaust gas pipe of an exhaust gas recirculation device of an internal combustion engine and an intake manifold made of synthetic resin through an annular connector. Connect the part close to the exhaust gas pipe with the outer surface of the exhaust gas pipe.
While forming a cylindrical bent portion with a gap between them,
Join the end of the bent part and the end of the exhaust gas pipe,
The heat radiation fins on the outer circumferential surface of the bent portion of the connector is provided, connecting structure of an exhaust gas recirculation system, characterized in that it arranged so as to face the heat radiating fin and the bent portion to the intake air passage of the intake manifold inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17181394A JP3378659B2 (en) | 1994-06-30 | 1994-06-30 | Connection structure of exhaust gas recirculation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17181394A JP3378659B2 (en) | 1994-06-30 | 1994-06-30 | Connection structure of exhaust gas recirculation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0821316A JPH0821316A (en) | 1996-01-23 |
| JP3378659B2 true JP3378659B2 (en) | 2003-02-17 |
Family
ID=15930211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17181394A Expired - Fee Related JP3378659B2 (en) | 1994-06-30 | 1994-06-30 | Connection structure of exhaust gas recirculation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3378659B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010036759A (en) * | 1999-10-11 | 2001-05-07 | 정주호 | The Connecting Structure For Joining The Exhaust Gas Recirculation Pipe To The Plastic Intake Manifold |
| JP6430185B2 (en) * | 2014-09-12 | 2018-11-28 | 日野自動車株式会社 | EGR device |
-
1994
- 1994-06-30 JP JP17181394A patent/JP3378659B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0821316A (en) | 1996-01-23 |
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