JP3430815B2 - Exhaust gas recirculation device for internal combustion engine - Google Patents

Exhaust gas recirculation device for internal combustion engine

Info

Publication number
JP3430815B2
JP3430815B2 JP24579496A JP24579496A JP3430815B2 JP 3430815 B2 JP3430815 B2 JP 3430815B2 JP 24579496 A JP24579496 A JP 24579496A JP 24579496 A JP24579496 A JP 24579496A JP 3430815 B2 JP3430815 B2 JP 3430815B2
Authority
JP
Japan
Prior art keywords
exhaust gas
gas recirculation
exhaust
control valve
housing
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
Application number
JP24579496A
Other languages
Japanese (ja)
Other versions
JPH1089160A (en
Inventor
聡 東吾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP24579496A priority Critical patent/JP3430815B2/en
Priority to US08/931,497 priority patent/US5970960A/en
Priority to DE19740998A priority patent/DE19740998C2/en
Priority to GB9719921A priority patent/GB2317420B/en
Priority to KR1019970047525A priority patent/KR100324455B1/en
Priority to GB9816016A priority patent/GB2324338B/en
Publication of JPH1089160A publication Critical patent/JPH1089160A/en
Priority to US09/317,144 priority patent/US6173701B1/en
Application granted granted Critical
Publication of JP3430815B2 publication Critical patent/JP3430815B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Landscapes

  • Exhaust-Gas Circulating Devices (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は、内燃機関の排気
系から吸気系へ排気の一部を還流する排気還流装置に関
し、特に、合成樹脂製吸気マニホルドに排気還流制御弁
を支持させてなる排気還流装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation system for recirculating a part of exhaust gas from an exhaust system of an internal combustion engine to an intake system, and in particular, an exhaust gas having a synthetic resin intake manifold supporting an exhaust gas recirculation control valve. The present invention relates to improvement of a reflux device.

【０００２】[0002]

【従来の技術】内燃機関の排気系から吸気系へ排気の一
部を還流させる排気還流装置においては、排気還流量を
制御するために、ダイヤフラム弁からなる排気還流制御
弁が排気還流通路に介装されているが、この排気還流制
御弁は、一般に、還流排気（ＥＧＲガス）の導入位置と
もなる吸気マニホルドに取り付けられ、該吸気マニホル
ドに支持されている。ここで、軽量化のために吸気マニ
ホルドを合成樹脂製とする場合には、ＥＧＲガスが通流
する排気還流制御弁が非常に高温となることから、該排
気還流制御弁の取付部において、吸気マニホルドが熱的
損傷を受けないように、何らかの対策が必要となる。2. Description of the Related Art In an exhaust gas recirculation system for recirculating a part of exhaust gas from an exhaust system of an internal combustion engine to an intake system, an exhaust gas recirculation control valve composed of a diaphragm valve is interposed in an exhaust gas recirculation passage in order to control an exhaust gas recirculation amount. Although mounted, this exhaust gas recirculation control valve is generally attached to and supported by the intake manifold, which also serves as a position for introducing recirculated exhaust gas (EGR gas). Here, when the intake manifold is made of synthetic resin in order to reduce the weight, the exhaust gas recirculation control valve through which the EGR gas flows becomes extremely hot. Some measures must be taken to prevent the manifold from being thermally damaged.

【０００３】例えば、特開平６−１０１５８７号公報に
おいては、薄肉のステンレス材からなる波形状に屈曲し
た取付ハウジングを介して排気還流制御弁を合成樹脂製
吸気マニホルドに支持させた構成が示されている。また
特開平５−２５６２１７号公報には、合成樹脂製吸気マ
ニホルドと排気還流制御弁との間に、断熱用のヒートイ
ンシュレータを介装し、吸気マニホルドに第１のボルト
でもって固定されたヒートインシュレータに対して、排
気還流制御弁を第２のボルトでもって固定するようにし
た構成が開示されている。For example, Japanese Unexamined Patent Publication No. 6-101587 discloses a structure in which an exhaust gas recirculation control valve is supported by a synthetic resin intake manifold via a mounting housing made of a thin stainless material and bent into a wave shape. There is. Further, in Japanese Patent Laid-Open No. 5-256217, a heat insulator for heat insulation is interposed between a synthetic resin intake manifold and an exhaust gas recirculation control valve, and the heat insulator is fixed to the intake manifold with a first bolt. On the other hand, a configuration is disclosed in which the exhaust gas recirculation control valve is fixed by the second bolt.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、前者の
特開平６−１０１５８７号公報記載の構成においては、
ＥＧＲガスから多量の熱を受ける排気還流制御弁を取付
ハウジングによって十分に冷却するためには、取付ハウ
ジングの熱交換面積を大きく確保する必要があり、従っ
て、取付ハウジングが大型化し、自動車のエンジンルー
ム内に搭載することが困難となる不具合がある。However, in the former configuration disclosed in JP-A-6-101587,
In order to sufficiently cool the exhaust gas recirculation control valve that receives a large amount of heat from the EGR gas with the mounting housing, it is necessary to secure a large heat exchange area of the mounting housing. There is a problem that it is difficult to mount inside.

【０００５】また後者の特開平５−２５６２１７号公報
の構成においては、積極的な冷却を行わずに単にヒート
インシュレータでもって断熱するようにしているため、
該ヒートインシュレータの温度が非常に高くなるので、
第２のボルトによる排気還流制御弁の取付強度の確保が
難しい。つまり、この第２のボルトが螺合するヒートイ
ンシュレータの雌ねじが高温下でへたりやすくなり、第
２のボルトが緩みやすい。Further, in the latter structure of Japanese Patent Laid-Open No. 5-256217, since heat is simply insulated with a heat insulator without actively cooling,
Since the temperature of the heat insulator becomes very high,
It is difficult to secure the mounting strength of the exhaust gas recirculation control valve with the second bolt. That is, the female screw of the heat insulator with which the second bolt is screwed is likely to be depressed under high temperature, and the second bolt is easily loosened.

【０００６】[0006]

【課題を解決するための手段】上記の課題を解決するた
めに、この発明は、合成樹脂製吸気マニホルドの取付座
部に排気還流制御弁が取り付けられ、該取付座部に開口
形成された排気導入孔から排気が導入される内燃機関の
排気還流装置において、上記取付座部と排気還流制御弁
との間に、金属製の冷却ハウジングを介在させるととも
に、この冷却ハウジングの略中央部に排気通路が貫通し
て形成され、かつ上記排気還流制御弁を上記冷却ハウジ
ングに固定するための制御弁固定用ボルトが螺合するね
じ孔が、上記排気通路とともに上記冷却ハウジングに形
成されており、これらの排気通路とねじ孔との周囲を囲
むように上記冷却ハウジング内部に冷却水通路が形成さ
れ、この冷却水通路に冷却水を通流させることを特徴と
している。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to an exhaust gas recirculation control valve attached to a mounting seat portion of a synthetic resin intake manifold, and an exhaust gas having an opening formed in the mounting seat portion. In an exhaust gas recirculation device for an internal combustion engine in which exhaust gas is introduced from an introduction hole, a metal cooling housing is interposed between the mounting seat portion and the exhaust gas recirculation control valve, and an exhaust passage is provided at a substantially central portion of the cooling housing. Penetrates
And the exhaust gas recirculation control valve is connected to the cooling housing.
The control valve fixing bolt for fixing to the ring is screwed.
A hole in the cooling housing together with the exhaust passage.
The exhaust passage and screw holes are surrounded by
A cooling water passage is formed inside the cooling housing.
The cooling water is made to flow through this cooling water passage .

【０００７】排気還流制御弁の熱は、金属製の冷却ハウ
ジングに伝わり、かつ該ハウジング内部を通流する冷却
水によって冷却される。そのため、合成樹脂製吸気マニ
ホルドの取付座部が高温となることがない。そして、制
御弁固定用ボルトが螺合するねじ孔が冷却水によって確
実に冷却される。 The heat of the exhaust gas recirculation control valve is transmitted to the metal cooling housing and is cooled by the cooling water flowing inside the housing. Therefore, the mounting seat of the synthetic resin intake manifold does not become hot. And control
The screw hole into which the valve fixing bolt is screwed in is secured by the cooling water.
Really cooled.

【０００８】また請求項２の発明では、上記冷却ハウジ
ングが、上記排気導入孔に挿通される排気吐出管を有
し、この排気吐出管と排気導入孔内周面との間に微小間
隙が保たれている。According to the second aspect of the present invention, the cooling housing has an exhaust discharge pipe inserted into the exhaust introduction hole, and a minute gap is maintained between the exhaust discharge pipe and the inner peripheral surface of the exhaust introduction hole. Is dripping

【０００９】従って、高温のＥＧＲガスは、排気吐出管
を通して吸気マニホルド内に導入されることになり、合
成樹脂からなる排気導入孔内周面にＥＧＲガスが直接接
触することがない。しかも、排気吐出管と排気導入孔内
周面との間に微小間隙を確保することで、排気吐出管か
ら排気導入孔内周面への熱の伝達が回避される。Therefore, the high temperature EGR gas is introduced into the intake manifold through the exhaust discharge pipe, and the EGR gas does not directly contact the inner peripheral surface of the exhaust introduction hole made of synthetic resin. Moreover, by ensuring a minute gap between the exhaust discharge pipe and the inner peripheral surface of the exhaust introduction hole, heat transfer from the exhaust discharge pipe to the inner peripheral surface of the exhaust introduction hole is avoided.

【００１０】請求項３の発明においては、上記のねじ孔
の開口部に、カウンタボアが形成されている。[0010] In the invention of claim 3, the opening of the upper Symbol screw holes, counterbore is formed.

【００１１】より具体的には、上記カウンタボアの軸方
向の深さは、制御弁取付面から上記冷却水通路までの肉
厚以上に設定されている。[0011] More specifically, the axial depth of the upper Symbol counterbore is set to more than the thickness of up to the cooling water passage from the control valve mounting surface.

【００１２】すなわち、制御弁固定用ボルトの螺条とか
み合う雌ねじ部分が冷却水によって確実に冷却されるよ
うになっており、排気還流制御弁から制御弁固定用ボル
トへ多量の熱が伝わったとしても、雌ねじ部分が高温と
なることがなく、そのへたりが防止される。That is, the internal thread portion of the control valve fixing bolt that meshes with the thread is surely cooled by the cooling water, and even if a large amount of heat is transferred from the exhaust gas recirculation control valve to the control valve fixing bolt. However, the internal thread portion does not reach a high temperature and its settling is prevented.

【００１３】また請求項４の発明では、上記冷却ハウジ
ングを上記吸気マニホルドに固定するためのハウジング
固定用ボルトが貫通する貫通孔が上記冷却ハウジングの
外周部に形成されており、かつ、上記ハウジング固定用
ボルトの頭部もしくはナットを支持する座面が、制御弁
取付面よりも凹んだ位置に設けられていることを特徴と
している。Further, according to the invention of claim 4 , a through hole through which a housing fixing bolt for fixing the cooling housing to the intake manifold is formed is formed in an outer peripheral portion of the cooling housing, and the housing fixing is made. The seating surface for supporting the head or nut of the utility bolt is provided at a position recessed from the control valve mounting surface.

【００１４】この構成においては、排気還流制御弁の熱
が伝わる制御弁取付面から上記座面までの距離が大きく
なり、それだけ熱伝導に対する抵抗が大きくなって、座
面付近の温度上昇が抑制される。また、この座面付近が
冷却ハウジング内部の冷却水通路に近くなり、積極的に
冷却される。従って、ハウジング固定用ボルトへの熱の
伝達が少なくなる。In this structure, the distance from the control valve mounting surface, through which the heat of the exhaust gas recirculation control valve is transferred, to the seat surface is increased, and the resistance to heat conduction is increased accordingly, and the temperature rise near the seat surface is suppressed. It Further, the vicinity of this seat surface is close to the cooling water passage inside the cooling housing, and is actively cooled. Therefore, heat transfer to the housing fixing bolt is reduced.

【００１５】[0015]

【発明の効果】この発明に係る内燃機関の排気還流装置
によれば、冷却水の通流により積極的に冷却される冷却
ハウジングが合成樹脂製吸気マニホルドと排気還流制御
弁との間に介在するので、排気還流制御弁から合成樹脂
製吸気マニホルドへの熱の伝達が抑制され、合成樹脂製
吸気マニホルドが熱的損傷を受けることがない。しかも
熱容量の大きな冷却水で冷却することにより、冷却ハウ
ジングを小型化できる。そして、制御弁固定用ボルトが
螺合する冷却ハウジング側の雌ねじを確実に冷却でき、
その高温化に伴う制御弁固定用ボルトの緩みを防止でき
る。 According to the exhaust gas recirculation system for an internal combustion engine of the present invention, the cooling housing, which is positively cooled by the flow of the cooling water, is interposed between the synthetic resin intake manifold and the exhaust gas recirculation control valve. Therefore, the transfer of heat from the exhaust gas recirculation control valve to the synthetic resin intake manifold is suppressed, and the synthetic resin intake manifold is not thermally damaged. Moreover, the cooling housing can be downsized by cooling with cooling water having a large heat capacity. And the control valve fixing bolt
The female screw on the cooling housing side to be screwed can be cooled securely,
It is possible to prevent the control valve fixing bolts from loosening due to the high temperature.
It

【００１６】また、請求項２の構成によれば、冷却ハウ
ジングの一部をなす排気吐出管を介して吸気マニホルド
内に排気が導入されるため、合成樹脂からなる排気導入
孔付近の温度上昇を確実に防止できる。Further, according to the second aspect of the invention, since the exhaust gas is introduced into the intake manifold through the exhaust gas discharge pipe forming a part of the cooling housing, the temperature rise in the vicinity of the exhaust gas introduction hole made of synthetic resin. It can be surely prevented.

【００１７】[0017]

【００１８】さらに請求項４の構成によれば、排気還流
制御弁からハウジング固定用ボルトへの熱の伝達が抑制
され、該ボルトを介した吸気マニホルドへの熱伝達が一
層少なくなる。Further, according to the structure of claim 4 , heat transfer from the exhaust gas recirculation control valve to the housing fixing bolt is suppressed, and heat transfer to the intake manifold via the bolt is further reduced.

【００１９】[0019]

【発明の実施の形態】以下、この発明の好ましい実施の
形態を図面に基づいて詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

【００２０】図１は、この発明に係る排気還流装置の要
部を分解して示す斜視図であって、合成樹脂製吸気マニ
ホルド１は、気筒列方向に沿って細長い箱状をなすコレ
クタ部２と、このコレクタ部２の側面から延びた図示せ
ぬ複数のブランチ部と、コレクタ部２の一端に形成され
た図示せぬスロットルチャンバが取り付けられる吸気入
口フランジ３と、から大略構成されており、適宜な合成
樹脂にて各部一体に成形されている。そして、上記吸気
入口フランジ３に近いコレクタ部２の側面に、排気還流
制御弁取付座部４が形成されている。この取付座部４
は、略矩形状をなし、その中心には、円形の排気導入孔
５が貫通形成されている。FIG. 1 is an exploded perspective view of an essential part of an exhaust gas recirculation system according to the present invention, in which a synthetic resin intake manifold 1 has a box-shaped collector portion 2 elongated in the cylinder row direction. And a plurality of branch portions (not shown) extending from the side surface of the collector portion 2 and an intake inlet flange 3 formed at one end of the collector portion 2 to which a throttle chamber (not shown) is attached. Each part is integrally molded with an appropriate synthetic resin. An exhaust gas recirculation control valve mounting seat portion 4 is formed on the side surface of the collector portion 2 near the intake inlet flange 3. This mounting seat 4
Has a substantially rectangular shape, and a circular exhaust introduction hole 5 is formed at the center thereof.

【００２１】上記取付座部４には、金属製の冷却ハウジ
ング６が取り付けられ、該冷却ハウジング６に、さらに
排気還流制御弁７が取り付けられている。この排気還流
制御弁７は、ダイヤフラム弁からなり、金属製の排気還
流パイプ８を介して、図示せぬ排気マニホルドから排気
の一部が導入されるようになっている。A metallic cooling housing 6 is mounted on the mounting seat portion 4, and an exhaust gas recirculation control valve 7 is further mounted on the cooling housing 6. The exhaust gas recirculation control valve 7 is a diaphragm valve, and a part of the exhaust gas is introduced from an exhaust manifold (not shown) through a metal exhaust gas recirculation pipe 8.

【００２２】図２および図３は、上記冷却ハウジング６
を示している。そして、図４は、この冷却ハウジング６
をコレクタ部２の取付座部４に取り付けた状態の断面図
を示している。この冷却ハウジング６は、例えばアルミ
ニウムダイキャストからなり、取付座部４側に位置する
冷却ハウジングリア１１と、排気還流制御弁７側に位置
する冷却ハウジングフロント１２とに２分割して構成さ
れているとともに、両者が、液体ガスケット等の適宜な
シール材を介して接合され、かつ３本のボルト１３（図
３参照）によって互いに一体に組み立てられている。上
記冷却ハウジングリア１１の背面は、上記取付座部４に
当接する平坦なコレクタ接合面１１ａとなっており、ま
た冷却ハウジングフロント１２の前面中央部分には、排
気還流制御弁７のボディ７ａがガスケット１６を介して
接合される平坦な制御弁取付面１２ａが形成されてい
る。2 and 3 show the cooling housing 6 described above.
Is shown. FIG. 4 shows the cooling housing 6
3 is a cross-sectional view showing a state in which is attached to the attachment seat portion 4 of the collector portion 2. The cooling housing 6 is made of, for example, aluminum die cast, and is divided into two parts, that is, a cooling housing rear 11 located on the mounting seat 4 side and a cooling housing front 12 located on the exhaust gas recirculation control valve 7 side. At the same time, the two are joined together through an appropriate sealing material such as a liquid gasket, and are integrally assembled with each other by three bolts 13 (see FIG. 3). The rear surface of the cooling housing rear 11 is a flat collector joint surface 11a that abuts the mounting seat portion 4, and the body 7a of the exhaust gas recirculation control valve 7 is a gasket at the center of the front surface of the cooling housing front surface 12. A flat control valve mounting surface 12a joined via 16 is formed.

【００２３】上記冷却ハウジング６の略中央部には、冷
却ハウジングリア１１と冷却ハウジングフロント１２と
の双方を貫通して排気通路１４が直線状に形成されてお
り、かつこの排気通路１４の周囲を全周に亙って囲むよ
うに、冷却ハウジング６内部に冷却水通路１５が形成さ
れている。上記排気通路１４の前端は、上記制御弁取付
面１２ａの中央に開口しており、ここに排気還流制御弁
７側の排気出口が接続されるようになっている。また、
排気通路１４の後端部分は、冷却ハウジングリア１１の
一部としてコレクタ接合面１１ａから円筒状に突出した
排気吐出管１７によって構成されている。上記排気吐出
管１７は、その外径が排気導入孔５の径よりも僅かに小
さく、排気導入孔５内周面との間に、微小間隙が確保さ
れている（図４参照）。An exhaust passage 14 is formed in a straight line at a substantially central portion of the cooling housing 6 so as to penetrate both the cooling housing rear 11 and the cooling housing front 12 and to surround the exhaust passage 14. A cooling water passage 15 is formed inside the cooling housing 6 so as to surround the entire circumference. The front end of the exhaust passage 14 is opened at the center of the control valve mounting surface 12a, and the exhaust outlet on the exhaust gas recirculation control valve 7 side is connected thereto. Also,
The rear end portion of the exhaust passage 14 is configured by an exhaust discharge pipe 17 that protrudes in a cylindrical shape from the collector joint surface 11 a as a part of the cooling housing rear 11. The exhaust discharge pipe 17 has an outer diameter slightly smaller than the diameter of the exhaust introduction hole 5, and a small gap is secured between the exhaust discharge pipe 17 and the inner peripheral surface of the exhaust introduction hole 5 (see FIG. 4).

【００２４】上記冷却ハウジングフロント１２の制御弁
取付面１２ａに開口した排気通路１４の両側には、一対
のねじ孔１８が形成されている。このねじ孔１８は、排
気還流制御弁７を固定するための図示せぬ制御弁固定用
ボルトが螺合するものであって、図４に示すように、冷
却ハウジングフロント１２の厚さの略全体に亙って形成
されており、かつ、その開口部には、カウンタボア１８
ａがそれぞれ形成されている。冷却ハウジング６内部の
冷却水通路１５は、冷却ハウジングフロント１２側にお
いては、図２に破線で示すように、ねじ孔１８が形成さ
れるボス部の外側を囲むように形成されている。そし
て、上記カウンタボア１８ａの軸方向の深さは、制御弁
取付面１２ａから上記冷却水通路１５に至るまでの肉厚
以上に設定されている。具体的には、この実施例では、
上記の肉厚に略等しいものとなっている。従って、ねじ
孔１８の中で実際に雌ねじが形成されている部分は、そ
の全体が冷却水通路１５によって囲まれ、確実に冷却さ
れるようになっている。A pair of screw holes 18 are formed on both sides of the exhaust passage 14 which is opened in the control valve mounting surface 12a of the cooling housing front 12. The screw hole 18 is for screwing a control valve fixing bolt (not shown) for fixing the exhaust gas recirculation control valve 7, and as shown in FIG. 4, substantially the entire thickness of the cooling housing front 12 is provided. The counterbore 18 is formed in the opening.
a are formed respectively. On the cooling housing front 12 side, the cooling water passage 15 inside the cooling housing 6 is formed so as to surround the outside of the boss portion where the screw hole 18 is formed, as shown by the broken line in FIG. The axial depth of the counter bore 18a is set to be equal to or larger than the wall thickness from the control valve mounting surface 12a to the cooling water passage 15. Specifically, in this example,
It is approximately equal to the above wall thickness. Therefore, the portion of the screw hole 18 where the internal thread is actually formed is surrounded by the cooling water passage 15 and is surely cooled.

【００２５】また上記冷却ハウジングフロント１２の下
部には、冷却水の入口となる略Ｌ字形のコネクタ１９
が、側部には、冷却水の出口となる略Ｌ字形のコネクタ
２０が、それぞれ取り付けられている。これらのコネク
タ１９，２０には、図示せぬ冷却水ホースが接続され、
内燃機関本体の冷却系統から冷却水の一部が供給され
る。At the lower part of the cooling housing front 12, a substantially L-shaped connector 19 which serves as an inlet for cooling water is provided.
However, a substantially L-shaped connector 20 serving as an outlet of the cooling water is attached to each side portion. A cooling water hose (not shown) is connected to these connectors 19 and 20,
Part of the cooling water is supplied from the cooling system of the internal combustion engine body.

【００２６】上記冷却ハウジングフロント１２の外周部
は、制御弁取付面１２ａから一段凹んでおり、この外周
部の３カ所に、ハウジング固定用ボルト２１が貫通する
貫通孔２２が形成されている。つまり、上記ハウジング
固定用ボルト２１の頭部２１ａを支持する座面１２ｂが
上記制御弁取付面１２ａから一段凹んでいる。上記ハウ
ジング固定用ボルト２１は、冷却ハウジング６を吸気コ
レクタ１の取付座部４に固定するためのものであり、図
４に示すように、取付座部４に埋め込まれた金属製イン
サート２３のねじ孔に先端部が螺合する。なお、上記取
付座部４の座面には、環状のシールリング２４を収容す
るための凹溝２５が形成されているとともに、該凹溝２
５の外周に、断熱用の凹溝２６が同心状に形成されてい
る。The outer peripheral portion of the cooling housing front 12 is recessed from the control valve mounting surface 12a by one step, and through holes 22 through which the housing fixing bolts 21 penetrate are formed at three locations on the outer peripheral portion. That is, the seat surface 12b that supports the head portion 21a of the housing fixing bolt 21 is recessed from the control valve mounting surface 12a by one step. The housing fixing bolts 21 are for fixing the cooling housing 6 to the mounting seat portion 4 of the intake collector 1, and as shown in FIG. 4, screws of the metal insert 23 embedded in the mounting seat portion 4. The tip is screwed into the hole. A recessed groove 25 for accommodating the annular seal ring 24 is formed on the seating surface of the mounting seat portion 4 and the recessed groove 2 is formed.
A heat insulating groove 26 is concentrically formed on the outer periphery of the groove 5.

【００２７】図５は、冷却ハウジングリア１１のみを示
している。この図５に示すように、冷却ハウジングリア
１１の下部には、一対のねじ孔２７を備えたブラケット
部２８が延設されている。また、この冷却ハウジングリ
ア１１の背面には、前述したボルト１３の頭部を収容す
るための凹部２９が３カ所に形成されている。冷却水通
路１５は、排気通路１４の全周に亙って形成されている
が、その上部に連通するように、空気抜き孔３０が設け
られている。この空気抜き孔３０は、雌ねじを備えてお
り、ここに螺合する空気抜きプラグ３１（図２参照）に
よって閉塞されている。また、排気通路１４の半径方向
に沿って、冷却ハウジングリア１１上面から排気通路１
４に達する温度センサ取付孔３２が形成されている。こ
の温度センサ取付孔３２はやはり雌ねじを備えており、
ＥＧＲガスの温度を測定するための図示せぬ温度センサ
が取り付けられるようになっている。FIG. 5 shows only the cooling housing rear 11. As shown in FIG. 5, a bracket portion 28 having a pair of screw holes 27 is provided at the lower portion of the cooling housing rear 11. Further, the rear surface of the cooling housing rear 11 is formed with three recesses 29 for accommodating the heads of the bolts 13 described above. Although the cooling water passage 15 is formed over the entire circumference of the exhaust passage 14, an air vent hole 30 is provided so as to communicate with the upper portion thereof. The air vent hole 30 is provided with a female screw and is closed by an air vent plug 31 (see FIG. 2) screwed into the female screw. Further, along the radial direction of the exhaust passage 14, from the upper surface of the cooling housing rear 11 to the exhaust passage 1
A temperature sensor mounting hole 32 reaching 4 is formed. The temperature sensor mounting hole 32 is also provided with a female screw,
A temperature sensor (not shown) for measuring the temperature of the EGR gas is attached.

【００２８】上記実施例の構成においては、非常に高温
となる排気還流制御弁７と合成樹脂製吸気マニホルド１
との間に冷却ハウジング６が介在し、かつこの冷却ハウ
ジング６が冷却水の通流によって強制冷却されるので、
合成樹脂製吸気マニホルド１に伝わる熱を大幅に低減で
きる。また、排気吐出管１７を通して排気が導入される
ため、吸気マニホルド１の排気導入孔５に高温排気ガス
が接触することがない。また、制御弁固定用ボルトが螺
合するねじ孔１８の雌ねじ部分が冷却水通路１５によっ
て確実に冷却されるため、該雌ねじ部分の高温へたりが
防止され、制御弁固定用ボルトの緩みを回避できる。さ
らに、ハウジング固定用ボルト２１の頭部２１ａを支持
する座面１２ｂが制御弁取付面１２ａから一段凹んでい
るため、排気還流制御弁７からハウジング固定用ボルト
２１へ熱が伝わる経路が長くなって熱伝導に対する抵抗
が増大し、ハウジング固定用ボルト２１を介した吸気マ
ニホルド１への熱伝達が抑制される。同時に、頭部２１
ａを含めてハウジング固定用ボルト２１全体が冷却水通
路１５によって冷却作用を受けることになり、吸気マニ
ホルド１への熱の移動が一層確実に防止される。In the construction of the above embodiment, the exhaust gas recirculation control valve 7 and the synthetic resin intake manifold 1 which become extremely hot.
Since the cooling housing 6 is interposed between the cooling housing 6 and the cooling housing 6, and the cooling housing 6 is forcibly cooled by the flow of cooling water,
The heat transferred to the synthetic resin intake manifold 1 can be greatly reduced. Further, since the exhaust gas is introduced through the exhaust discharge pipe 17, the high temperature exhaust gas does not come into contact with the exhaust gas introduction hole 5 of the intake manifold 1. Further, since the female screw portion of the screw hole 18 with which the control valve fixing bolt is screwed is reliably cooled by the cooling water passage 15, the temperature rise of the female screw portion is prevented, and the loosening of the control valve fixing bolt is avoided. it can. Further, since the seat surface 12b supporting the head portion 21a of the housing fixing bolt 21 is recessed from the control valve mounting surface 12a by one step, the heat transfer path from the exhaust gas recirculation control valve 7 to the housing fixing bolt 21 becomes long. Resistance to heat conduction increases, and heat transfer to the intake manifold 1 via the housing fixing bolts 21 is suppressed. At the same time, the head 21
The entire housing fixing bolt 21 including a is subjected to the cooling action by the cooling water passage 15, so that the transfer of heat to the intake manifold 1 is further reliably prevented.

【００２９】なお、ハウジング固定用ボルト２１として
スタッドボルトを用い、これに螺合するナットを上記座
面１２ｂにおいて支持するようにしてもよい。また上記
実施例では、排気吐出管１７を冷却ハウジング６と一体
に形成しているが、別部材からなる金属管を圧入等によ
り固定してもよい。この場合、金属管としてステンレス
等の断熱性に優れたものを用いれば、排気導入孔５の加
熱を一層抑制できる。A stud bolt may be used as the housing fixing bolt 21, and a nut screwed with the stud bolt may be supported on the seat surface 12b. Further, in the above embodiment, the exhaust gas discharge pipe 17 is formed integrally with the cooling housing 6, but a metal pipe made of another member may be fixed by press fitting or the like. In this case, if a metal tube having excellent heat insulating property such as stainless steel is used, heating of the exhaust gas introduction hole 5 can be further suppressed.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明に係る排気還流装置の要部を示す分解
斜視図。FIG. 1 is an exploded perspective view showing a main part of an exhaust gas recirculation device according to the present invention.

【図２】冷却ハウジングの正面図。FIG. 2 is a front view of a cooling housing.

【図３】冷却ハウジングの側面図。FIG. 3 is a side view of the cooling housing.

【図４】冷却ハウジングを吸気マニホルドに取り付けた
状態を示す断面図。FIG. 4 is a cross-sectional view showing a state in which the cooling housing is attached to the intake manifold.

【図５】冷却ハウジングリアの正面図。FIG. 5 is a front view of a cooling housing rear.

【符号の説明】[Explanation of symbols]

１…吸気マニホルド ４…取付座部 ５…排気導入孔 ６…冷却ハウジング ７…排気還流制御弁 １５…冷却水通路 １７…排気吐出管 １８…ねじ孔 １８ａ…カウンタボア ２１…ハウジング固定用ボルト 1 ... Intake manifold 4 ... Mounting seat 5 ... Exhaust introduction hole 6 ... Cooling housing 7 ... Exhaust gas recirculation control valve 15 ... Cooling water passage 17 ... Exhaust discharge pipe 18 ... Screw hole 18a ... Counter bore 21 ... Housing fixing bolt

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−146251（ＪＰ，Ａ) 特開 平５−44583（ＪＰ，Ａ) 特開 平６−101587（ＪＰ，Ａ) 特開 平５−256217（ＪＰ，Ａ) 特開 平６−346782（ＪＰ，Ａ) 特開 平８−74677（ＪＰ，Ａ) 実開 昭63−164554（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 25/07 580 F02M 25/07 520 F02M 35/10 311 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-146251 (JP, A) JP-A-5-44583 (JP, A) JP-A-6-101587 (JP, A) JP-A-5- 256217 (JP, A) JP-A-6-346782 (JP, A) JP-A-8-74677 (JP, A) Actual development Sho 63-164554 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F02M 25/07 580 F02M 25/07 520 F02M 35/10 311

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 合成樹脂製吸気マニホルドの取付座部に
排気還流制御弁が取り付けられ、該取付座部に開口形成
された排気導入孔から排気が導入される内燃機関の排気
還流装置において、上記取付座部と排気還流制御弁との
間に、金属製の冷却ハウジングを介在させるとともに、
この冷却ハウジングの略中央部に排気通路が貫通して形
成され、かつ上記排気還流制御弁を上記冷却ハウジング
に固定するための制御弁固定用ボルトが螺合するねじ孔
が、上記排気通路とともに上記冷却ハウジングに形成さ
れており、これらの排気通路とねじ孔との周囲を囲むよ
うに上記冷却ハウジング内部に冷却水通路が形成され、
この冷却水通路に冷却水を通流させることを特徴とする
内燃機関の排気還流装置。1. An exhaust gas recirculation system for an internal combustion engine, wherein an exhaust gas recirculation control valve is attached to a mounting seat portion of a synthetic resin intake manifold, and exhaust gas is introduced from an exhaust gas introduction hole formed in the mounting seat portion. A metal cooling housing is interposed between the mounting seat and the exhaust gas recirculation control valve, and
An exhaust passage is formed in the approximate center of this cooling housing.
And an exhaust gas recirculation control valve for the cooling housing
Hole into which the control valve fixing bolt for fixing to
Is formed in the cooling housing together with the exhaust passage.
And surround the perimeter of these exhaust passages and screw holes.
As described above, a cooling water passage is formed inside the cooling housing,
An exhaust gas recirculation device for an internal combustion engine, characterized in that cooling water is caused to flow through the cooling water passage . 【請求項２】 上記冷却ハウジングが、上記排気導入孔
に挿通される排気吐出管を有し、この排気吐出管と排気
導入孔内周面との間に微小間隙が保たれていることを特
徴とする請求項１記載の内燃機関の排気還流装置。2. The cooling housing has an exhaust discharge pipe inserted into the exhaust introduction hole, and a minute gap is maintained between the exhaust discharge pipe and the inner peripheral surface of the exhaust introduction hole. An exhaust gas recirculation system for an internal combustion engine according to claim 1. 【請求項３】 上記ねじ孔の開口部に、カウンタボアが
形成されており、このカウンタボアの軸方向の深さは、
制御弁取付面から上記冷却水通路までの肉厚以上に設定
されていることを特徴とする請求項１または２に記載の
内燃機関の排気還流装置。3. A counterbore is provided at the opening of the screw hole.
Is formed and the axial depth of this counterbore is
The exhaust gas recirculation device for an internal combustion engine according to claim 1 or 2, wherein the thickness is set to be equal to or greater than the thickness from the control valve mounting surface to the cooling water passage. 【請求項４】 上記冷却ハウジングを上記吸気マニホル
ドに固定するためのハウジング固定用ボルトが貫通する
貫通孔が上記冷却ハウジングの外周部に形成されてお
り、かつ、上記ハウジング固定用ボルトの頭部もしくは
ナットを支持する座面が、制御弁取付面よりも凹んだ位
置に設けられていることを特徴とする請求項１〜３のい
ずれかに記載の内燃機関の排気還流装置。4. A through hole through which a housing fixing bolt for fixing the cooling housing to the intake manifold penetrates is formed in an outer peripheral portion of the cooling housing, and a head of the housing fixing bolt or The exhaust gas recirculation device for an internal combustion engine according to any one of claims 1 to 5 , wherein the seat surface supporting the nut is provided at a position recessed from the control valve mounting surface.
JP24579496A 1996-09-18 1996-09-18 Exhaust gas recirculation device for internal combustion engine Expired - Fee Related JP3430815B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP24579496A JP3430815B2 (en) 1996-09-18 1996-09-18 Exhaust gas recirculation device for internal combustion engine
US08/931,497 US5970960A (en) 1996-09-18 1997-09-16 Exhaust gas recirculation system of internal combustion engine
DE19740998A DE19740998C2 (en) 1996-09-18 1997-09-17 Exhaust gas recirculation system for an internal combustion engine
KR1019970047525A KR100324455B1 (en) 1996-09-18 1997-09-18 Exhaust Gas Recirculation System of Internal Combustion Engine
GB9719921A GB2317420B (en) 1996-09-18 1997-09-18 Exhaust gas recirculation system of internal combustion engine
GB9816016A GB2324338B (en) 1996-09-18 1997-09-18 Exhaust gas recirculation system having a plastic intake passage
US09/317,144 US6173701B1 (en) 1996-09-18 1999-05-24 Exhaust gas recirculation system of internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24579496A JP3430815B2 (en) 1996-09-18 1996-09-18 Exhaust gas recirculation device for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH1089160A JPH1089160A (en) 1998-04-07
JP3430815B2 true JP3430815B2 (en) 2003-07-28

Family

ID=17138938

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24579496A Expired - Fee Related JP3430815B2 (en) 1996-09-18 1996-09-18 Exhaust gas recirculation device for internal combustion engine

Country Status (1)

Country Link
JP (1) JP3430815B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015190416A (en) * 2014-03-28 2015-11-02 マツダ株式会社 Engine exhaust gas recirculation device

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3321619B2 (en) * 1998-12-25 2002-09-03 愛知機械工業株式会社 Mounting structure of EGR valve and EGR tube
WO2001098647A1 (en) * 2000-06-20 2001-12-27 Mitsubishi Denki Kabushiki Kaisha Water-cooled exhaust gas recirculating device
JP4659511B2 (en) * 2005-04-28 2011-03-30 株式会社小松製作所 EGR cooler device
EP2402585B1 (en) 2009-02-12 2015-12-16 MAHLE Behr GmbH & Co. KG Device for recirculating exhaust gas for an internal combustion engine
FR2954413B1 (en) * 2009-12-21 2016-01-01 Valeo Systemes Thermiques GAS SUPPLY MODULE OF A MOTOR VEHICLE ENGINE, ASSEMBLY OF A CYLINDER HEAD OF AN ENGINE AND SUCH A MODULE AND THERMAL MOTOR COMPRISING SUCH AN ASSEMBLY.
JP5146556B2 (en) * 2010-04-16 2013-02-20 株式会社デンソー Low pressure EGR valve unit
JP2012117386A (en) * 2010-11-29 2012-06-21 Toyota Boshoku Corp Intake manifold
JP5936321B2 (en) * 2011-09-05 2016-06-22 日野自動車株式会社 Freezing prevention device for EGR device
WO2017034043A1 (en) * 2016-09-26 2017-03-02 株式会社小松製作所 Egr device and dump truck provided with same
FR3068103B1 (en) * 2017-06-27 2020-02-14 Valeo Systemes De Controle Moteur GAS FLOW REGULATION VALVE FOR ASSEMBLY OF A RECEPTACLE AND ASSEMBLY COMPRISING SUCH A VALVE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015190416A (en) * 2014-03-28 2015-11-02 マツダ株式会社 Engine exhaust gas recirculation device

Also Published As

Publication number Publication date
JPH1089160A (en) 1998-04-07

Similar Documents

Publication Publication Date Title
US6173701B1 (en) Exhaust gas recirculation system of internal combustion engine
JP3430815B2 (en) Exhaust gas recirculation device for internal combustion engine
JP3558792B2 (en) Intake manifold, intake control device and manufacturing method thereof
US6422221B2 (en) Intake manifold with integrated exhaust gas recirculation system
US10767544B2 (en) Valve body, electronic control throttle body, motor-driven throttle body, and valve device
US4938176A (en) Mounting structure of EGR valve for internal combustion engine
US7487765B1 (en) Intake air heater and air delivery assembly for engines
JP2001123901A (en) Intake manifold and method of manufacturing it
US6244255B1 (en) Mounting structure for EGR valve or EGR tube
JP3674389B2 (en) Intake manifold for internal combustion engine
JPH09317579A (en) Intake device for internal combustion engine
CN113027648B (en) Intake manifold and EGR system connection structure
JP3310144B2 (en) Fuel piping system
JPH07102993A (en) Exhaust temperature sensor installation device for catalyst case
JP2000002109A (en) Connection structure for blow-by hose
JPH09317466A (en) Mounting structure of thermostat cap
JPH0751919B2 (en) EGR valve mounting structure for internal combustion engine
JPH09256928A (en) Intake device for cylinder direct injection type gasoline engine
JP4285621B2 (en) Mounting structure of fuel injection valve
JPS6314053Y2 (en)
JP2005537415A (en) Cylinder head of internal combustion engine
JPH0968118A (en) Exhaust gas recirculation device for intake manifold made of resin
JPH11294274A (en) Intake manifold for internal combustion engine
JPH0524937U (en) EGR passage mounting structure for resin intake manifold
JPH07180619A (en) Egr valve fitting structure for internal combustion engine

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080523

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090523

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees