JPH0932652A - Exhaust gas recirculation device - Google Patents

Exhaust gas recirculation device

Info

Publication number
JPH0932652A
JPH0932652A JP7177514A JP17751495A JPH0932652A JP H0932652 A JPH0932652 A JP H0932652A JP 7177514 A JP7177514 A JP 7177514A JP 17751495 A JP17751495 A JP 17751495A JP H0932652 A JPH0932652 A JP H0932652A
Authority
JP
Japan
Prior art keywords
exhaust gas
recirculation
throttle valve
intake
port
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.)
Granted
Application number
JP7177514A
Other languages
Japanese (ja)
Other versions
JP3479756B2 (en
Inventor
Masahiro Kobayashi
昌弘 小林
Toshiro Makimura
敏朗 牧村
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.)
Aisan Industry Co Ltd
Original Assignee
Aisan Industry 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 Aisan Industry Co Ltd filed Critical Aisan Industry Co Ltd
Priority to JP17751495A priority Critical patent/JP3479756B2/en
Priority to EP96304661A priority patent/EP0753656B1/en
Priority to DE69600224T priority patent/DE69600224T2/en
Publication of JPH0932652A publication Critical patent/JPH0932652A/en
Application granted granted Critical
Publication of JP3479756B2 publication Critical patent/JP3479756B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To keep the stable operability by decreasing adhesion of a deposit to an intake throttle valve and cooling the peripheral part of a recirculation port. SOLUTION: An exhaust gas recirculation device 1A comprises an intake throttle valve 10 shaft-supported on a throttle valve main body 14 to open and close an intake passage 15, and a recirculation control valve 20 which is formed in such a manner as to open and close a recirculation port 31 communicated with an exhaust gas recirculation passage, the recirculation port 31 being projected and opened to the intake passage 15 downstream from the intake throttle valve 10. The recirculation port 31 of the recirculation control valve 20 is provided with a ventilation hood 35 for guiding the flow of exhaust gas to the downstream of the intake passage 15. An air passage 40 communicated with the intake passage 15 is formed between the ventilation hood 35 and the throttle valve main body 14, and the outer peripheral part of the recirculation port 31 is formed in such a manner as to be exposed to the inside of the air passage 40.

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ガ
ス還流装置に関し、特に吸気絞り弁と還流制御弁とが一
体に構成された排気ガス還流装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation system for an internal combustion engine, and more particularly to an exhaust gas recirculation system in which an intake throttle valve and a recirculation control valve are integrally formed.

【０００２】[0002]

【従来の技術】従来、内燃機関から排出される排気ガス
を吸気通路に再循環させる装置において、吸気絞り弁と
還流制御弁とが一体に構成され、排気ガス還流路に連通
された還流口を吸気絞り弁下流の吸気通路に突出して開
口させ、還流量を制御された排気ガスを吸気中に分散さ
せるようにした装置が知られている。（例えば、実開昭
５７−１０４５５号公報参照）。2. Description of the Related Art Conventionally, in a device for recirculating exhaust gas discharged from an internal combustion engine to an intake passage, an intake throttle valve and a recirculation control valve are integrally formed, and a recirculation port communicating with an exhaust gas recirculation passage is provided. 2. Description of the Related Art There is known a device that projects and opens an intake passage downstream of an intake throttle valve to disperse exhaust gas whose recirculation amount is controlled in intake air. (See, for example, Japanese Utility Model Laid-Open No. 57-10455).

【０００３】[0003]

【発明が解決しようとする課題】しかし、このような従
来の排気ガス還流装置においては、内燃機関の減速操作
により吸気絞り弁直下流に一時的に負圧が生じ、その負
圧により排気ガスが吸気絞り弁に巻込まれ、、吸気絞り
弁や絞り弁軸等にデポジットが付着し、次第に堆積して
吸気絞り弁の作動性を低下させるという問題があった。However, in such a conventional exhaust gas recirculation system, a negative pressure is temporarily generated immediately downstream of the intake throttle valve due to the deceleration operation of the internal combustion engine, and the negative pressure causes exhaust gas to be exhausted. There is a problem that the intake throttle valve is caught, deposits are attached to the intake throttle valve, throttle valve shaft, etc., and gradually accumulate to reduce the operability of the intake throttle valve.

【０００４】この発明は、上記問題を解決するためにな
されたものであり、その目的とするところは、吸気絞り
弁へのデポジットの付着を減少させるとともに還流口周
辺部の冷却を行って安定した作動性を保持することので
きる排気ガス還流装置を提供しようとするものである。The present invention has been made in order to solve the above problems, and its object is to reduce the adhesion of deposits to the intake throttle valve and to cool the periphery of the recirculation port for stable operation. It is intended to provide an exhaust gas recirculation device that can maintain operability.

【０００５】[0005]

【課題を解決するための手段】この発明は上記目的を達
成するためになされたものであり、本発明の排気ガス還
流装置は、絞り弁本体に軸支されて吸気通路を開閉可能
な吸気絞り弁と、排気ガス還流路に連通された還流口を
開閉可能に形成されるとともに該還流口が前記吸気絞り
弁下流の吸気通路に突出開口された還流制御弁と、を備
えた排気ガス還流装置において、前記還流制御弁の還流
口は、排気ガスの流れを前記吸気通路の下流方向へ案内
する通気フードを備え、前記通気フードと前記絞り弁本
体との間に前記吸気通路に連通する空気通路が形成され
るとともに、前記空気通路内に前記還流口外周部が露出
形成されてなる、ことを特徴とする排気ガス還流装置で
ある。The present invention has been made to achieve the above object, and an exhaust gas recirculation device according to the present invention is an intake throttle which is pivotally supported by a throttle valve body to open and close an intake passage. An exhaust gas recirculation device including a valve and a recirculation port communicating with the exhaust gas recirculation passage that is openable and closable and has a recirculation control valve that projects into the intake passage downstream of the intake throttle valve. In the recirculation control valve, a recirculation port is provided with a ventilation hood that guides a flow of exhaust gas in a downstream direction of the intake passage, and an air passage communicating with the intake passage between the ventilation hood and the throttle valve body. And the outer peripheral portion of the recirculation port is exposed and formed in the air passage.

【０００６】[0006]

【発明の実施の形態】以下、この発明の実施の形態を図
面に基づいて説明する。Embodiments of the present invention will be described below with reference to the drawings.

【０００７】図１，２に示す排気ガス還流装置１Ａは、
吸気絞り弁１０と、排気ガス還流路に連通されるととも
に吸気通路１５内に突出開口された還流口３１を有する
還流制御弁２０とを備えて一体的に構成され、還流口３
１には通気フード３５が設けられている。The exhaust gas recirculation system 1A shown in FIGS.
The intake throttle valve 10 and a recirculation control valve 20 that is in communication with the exhaust gas recirculation passage and has a recirculation opening 31 that projects into the intake passage 15 are integrally configured.
1, a ventilation hood 35 is provided.

【０００８】吸気絞り弁１０は、絞り弁軸１１に固着さ
れ、軸受（図示省略）を介して絞り弁本体１４に回動可
能に支持されている。The intake throttle valve 10 is fixed to a throttle valve shaft 11 and is rotatably supported by a throttle valve body 14 via a bearing (not shown).

【０００９】絞り弁本体１４は、アルミニウム合金等の
金属部材からなり、図１において上下方向に貫通する吸
気通路１５を備えるとともに、吸気絞り弁１０の下流
（図１の下方側）の所定位置に、還流制御弁２０のため
のアクチュエータ受部１６、還流口受部１７が形成され
ている。The throttle valve main body 14 is made of a metal member such as an aluminum alloy, has an intake passage 15 penetrating in the vertical direction in FIG. 1, and is provided at a predetermined position downstream of the intake throttle valve 10 (lower side in FIG. 1). An actuator receiving portion 16 and a return opening receiving portion 17 for the recirculation control valve 20 are formed.

【００１０】なお、絞り弁軸１１は、図示しない玉軸受
に回動可能に支持されるとともに、一端には図示しない
アクセルワイヤが接続され、他端にはスロットルバルブ
開度センサ（図示省略）が取付けられている。また、還
流口受部１７近傍の吸気通路１５内の所定位置には、後
述する通気フード３５が絞り弁本体１４と一体に形成さ
れている。The throttle valve shaft 11 is rotatably supported by a ball bearing (not shown), an accelerator wire (not shown) is connected to one end, and a throttle valve opening sensor (not shown) is connected to the other end. Installed. A ventilation hood 35, which will be described later, is formed integrally with the throttle valve body 14 at a predetermined position in the intake passage 15 near the return port receiving portion 17.

【００１１】還流制御弁２０は、制御弁体２７を駆動す
るダイアフラム式のアクチュエータ２１と、還流口３１
を備えた還流口本体３０とにより構成されている。The recirculation control valve 20 includes a diaphragm type actuator 21 for driving a control valve body 27 and a recirculation port 31.
And a return port main body 30 including.

【００１２】アクチュエータ２１は、アクチュエータ受
部１６をケースの一部とするとともに、ケース２２，ダ
イアフラム２３，ばね２４等とから構成されており、ダ
イアフラム２３とケース２２との間に負圧室２５が形成
されている。ダイアフラム２３には制御弁軸２６が取付
けられており、制御弁軸２６は、吸気通路１５の軸線に
直交して吸気通路１５内に突出するとともに、先端部に
は制御弁体２７が固着されている。なお、符号２８は制
御弁軸２６を軸方向に移動可能に支持する弁軸受であ
る。The actuator 21 has the actuator receiving portion 16 as a part of the case, and is composed of a case 22, a diaphragm 23, a spring 24 and the like. A negative pressure chamber 25 is provided between the diaphragm 23 and the case 22. Has been formed. A control valve shaft 26 is attached to the diaphragm 23. The control valve shaft 26 projects into the intake passage 15 at right angles to the axis of the intake passage 15, and a control valve body 27 is fixed to the tip end portion thereof. There is. Reference numeral 28 is a valve bearing that supports the control valve shaft 26 so as to be movable in the axial direction.

【００１３】還流口本体３０は、例えば、筒状のステン
レス鋼材からなり、還流口受部１７に圧入して固着され
るとともに、一側の開口に還流口３１が形成されて吸気
通路１５内に突出し、他側の開口には、排気ガス還流路
が接続される還流ポート３３が形成されている。また、
還流口３１の開口端は弁座部３２を形成し、制御弁体２
７に対面して配設されて、制御弁体２７の移動により開
閉され、還流口３１の先端部は、通気フード３５の嵌合
孔３６に嵌入されている。The recirculation port body 30 is made of, for example, a cylindrical stainless steel material, is press-fitted into the recirculation port receiving portion 17 and is fixed thereto, and the recirculation port 31 is formed on one side opening so that the recirculation port body 30 is provided in the intake passage 15. A recirculation port 33, to which the exhaust gas recirculation passage is connected, is formed in the projecting and other side opening. Also,
The open end of the return port 31 forms a valve seat portion 32, and the control valve body 2
7, the control valve body 27 is opened and closed by the movement of the control valve body 27, and the tip of the return port 31 is fitted into the fitting hole 36 of the ventilation hood 35.

【００１４】通気フード３５は、一方が開口した箱形状
に形成され開口部３８が下流方向へ向けて開口するとと
もに、所定位置に嵌合孔３６および貫通孔３７が形成さ
れている。そして、嵌合孔３６は還流口３１先端部と嵌
合し、貫通孔３７には制御弁軸２６が貫通している。The ventilation hood 35 is formed in a box shape with one side open, and an opening 38 opens in the downstream direction, and a fitting hole 36 and a through hole 37 are formed at predetermined positions. The fitting hole 36 is fitted to the tip of the return port 31, and the control valve shaft 26 penetrates the through hole 37.

【００１５】この通気フード３５は、脚部３９，３９を
介して絞り弁本体１４と一体に形成されて吸気通路１５
内に設けられ、絞り弁本体１４内壁との間には空気通路
４０が形成されている。従って、空気通路４０は上流
側，下流側ともに吸気通路１５と連通し、空気通路４０
内には、還流口本体３０の還流口３１外周部が露出して
横断している（図２参照）。The ventilation hood 35 is formed integrally with the throttle valve main body 14 via the leg portions 39, 39 to form the intake passage 15.
An air passage 40 is provided in the inside of the throttle valve body 14 and inside of the throttle valve body 14. Therefore, the air passage 40 communicates with the intake passage 15 on both the upstream side and the downstream side, and the air passage 40
An outer peripheral portion of the return port 31 of the return port body 30 is exposed and traversed therein (see FIG. 2).

【００１６】次にこのように構成された排気ガス還流装
置１Ａの作用について説明する。Next, the operation of the exhaust gas recirculation system 1A thus constructed will be described.

【００１７】排気ガス還流装置１Ａは、内燃機関の吸気
系に取付けられるとともに、排気ガス還流路が還流ポー
ト３３に接続され、還流制御弁２０の負圧室２５は図示
しない負圧源に接続されている。The exhaust gas recirculation system 1A is attached to the intake system of an internal combustion engine, the exhaust gas recirculation path is connected to the recirculation port 33, and the negative pressure chamber 25 of the recirculation control valve 20 is connected to a negative pressure source (not shown). ing.

【００１８】そして、内燃機関の運転状態に応じ、絞り
弁軸１１は回動して絞り弁本体１４は吸気通路１５を開
閉し、還流制御弁２０には負圧が作用して、制御弁体２
７が還流口３１を開閉する。Then, according to the operating state of the internal combustion engine, the throttle valve shaft 11 rotates, the throttle valve body 14 opens and closes the intake passage 15, and a negative pressure acts on the recirculation control valve 20 to control the valve body. Two
7 opens and closes the reflux port 31.

【００１９】これにより、排気ガス還流路よりの排気ガ
スは、還流口３１から導入されるとともに、通気フード
３５により吸気通路１５の下流方向へ流れの向きを変
え、開口部３８より吸気通路１５内に吐出され（図１の
破線矢印Ｅ参照）、吸気通路１５および空気通路４０を
下流へ向かう吸気（図１の２点鎖線矢印Ｃ参照）と混合
されて、内燃機関の各気筒へ送られる。As a result, the exhaust gas from the exhaust gas recirculation passage is introduced from the recirculation port 31, and the flow direction of the exhaust gas is changed to the downstream direction of the intake passage 15 by the ventilation hood 35, and the inside of the intake passage 15 is opened from the opening 38. 1 (see a dashed arrow E in FIG. 1), and is mixed with intake air flowing in the intake passage 15 and the air passage 40 toward the downstream (see a two-dot chain line arrow C in FIG. 1) and sent to each cylinder of the internal combustion engine.

【００２０】内燃機関の減速操作により、吸気絞り弁１
０の直下流に一時的な負圧が生じたとき、通気フード３
５の開口部３８と吸気絞り弁１０との間の距離が離れて
いること、および上記負圧の作用方向と排気ガスの吐出
方向とが１８０度異なっているため、その負圧による排
気ガスの巻き込みが少なくなり、吸気絞り弁１０や絞り
弁軸１１へのデポジットの付着が減少する。The intake throttle valve 1 is operated by decelerating the internal combustion engine.
Ventilation hood 3 when a temporary negative pressure occurs immediately downstream of 0
Since the distance between the opening 38 of No. 5 and the intake throttle valve 10 is large, and the acting direction of the negative pressure and the discharge direction of the exhaust gas are different by 180 degrees, the exhaust gas due to the negative pressure is Entrainment is reduced, and deposits on the intake throttle valve 10 and throttle valve shaft 11 are reduced.

【００２１】また、排気ガスの高熱は、還流口本体３０
より還流口受部１７を経て絞り弁本体１４へ伝達され
る。ここで、還流口本体３０は、還流口３１外周部が空
気通路４０において吸気（図１の２点鎖線矢印Ｄ参照）
に晒され、通気フード３５の冷却フィン作用とともに、
空気通路４０および吸気通路１５を流れる吸気により熱
を奪われて冷却される。Further, the high heat of the exhaust gas is caused by the recirculation port body 30.
It is transmitted to the throttle valve body 14 via the return port receiving portion 17. Here, in the return port main body 30, the outer peripheral portion of the return port 31 is inhaled in the air passage 40 (see the two-dot chain line arrow D in FIG. 1).
Exposed to the cooling fin action of the ventilation hood 35,
The intake air flowing through the air passage 40 and the intake passage 15 removes heat and is cooled.

【００２２】この冷却効果を、比較例Ａで示す他の形状
の通気フード５２（図３に示すように排気ガスの流れを
単に転向させるもの）を備えたの排気ガス還流装置５１
Ａ、および比較例Ｂで示す還流口３１が吸気通路１５壁
とほぼ同じ面に開口した排気ガス還流装置５１Ｂ（図４
参照）と比較して説明する。なお、図３，４において排
気ガス還流装置１Ａと同一、あるいは同等な構成要素は
同一符号を附してある。Exhaust gas recirculation device 51 having this cooling effect is provided with ventilation hood 52 of another shape shown in Comparative Example A (which simply diverts the flow of exhaust gas as shown in FIG. 3).
Exhaust gas recirculation device 51B shown in FIG.
(See) and explain. 3 and 4, constituent elements that are the same as or equivalent to those of the exhaust gas recirculation device 1A are given the same reference numerals.

【００２３】図５は、還流される排気ガスの温度が、還
流ポート３３において、例えば５００℃のときの、各排
気ガス還流装置１Ａ，５１Ａ，５１Ｂの還流口受部１７
の測温点Ｔにおける温度を比較して示した図である。す
なわち、本発明品の排気ガス還流装置１Ａは、測温点Ｔ
において１９０℃であり、排気ガス還流装置５１Ａでは
２５０℃に達し、排気ガス還流装置５１Ｂでは１４０℃
であった。FIG. 5 shows that the temperature of the recirculated exhaust gas at the recirculation port 33 is, for example, 500.degree.
It is the figure which compared and showed the temperature in the temperature measurement point T of. That is, the exhaust gas recirculation device 1A of the present invention has the temperature measurement point T
Is 190 ° C., the exhaust gas recirculation device 51A reaches 250 ° C., and the exhaust gas recirculation device 51B is 140 ° C.
Met.

【００２４】この比較結果から明らかなように、排気ガ
ス還流装置１Ａと５１Ａとでは、導入された排気ガスを
下流方向へ転向して吐出する点では同様であるが、還流
口３１周辺部における冷却効果に大きな差異がある。As is clear from this comparison result, the exhaust gas recirculation devices 1A and 51A are similar in that the introduced exhaust gas is diverted in the downstream direction and discharged, but the cooling around the recirculation port 31 is performed. There is a big difference in the effect.

【００２５】絞り弁本体１４に使用されている金属材料
は、クリープ温度が２５０℃であり、排気ガス還流装置
５１Ａでは還流口受部１７がクリープ温度に達して、圧
入固着力が小さくなり、還流口本体３０の取付けが緩む
おそれがある。比較例の内、Ｔ点温度の最も低いのは還
流口３１に通気フードのない排気ガス還流装置５１Ｂで
あり、本案の排気ガス還流装置１Ａは、還流口本体３０
の冷却効果により測温点Ｔ温度をクリープ温度以下に低
下させて、装置を安定して作動させることができる。The metal material used for the throttle valve body 14 has a creep temperature of 250 ° C., and in the exhaust gas recirculation device 51A, the recirculation port receiving portion 17 reaches the creep temperature, the press-fitting fixing force becomes small, and recirculation occurs. The attachment of the mouth body 30 may be loosened. Among the comparative examples, the lowest T-point temperature is the exhaust gas recirculation device 51B having no ventilation hood at the recirculation port 31, and the exhaust gas recirculation device 1A of the present invention has the recirculation port body 30.
The temperature measurement point T temperature can be lowered to the creep temperature or lower by the cooling effect of 1, and the device can be operated stably.

【００２６】図６，７は、絞り弁軸１１と制御弁軸２６
とが並行に配設された実施態様の排気ガス還流装置１Ｂ
を示す。なお、符号１２は玉軸受であり、絞り弁軸１１
の端部にはスロットルバルブ開度センサ１９が取付けら
れている。6 and 7 show the throttle valve shaft 11 and the control valve shaft 26.
Exhaust gas recirculation device 1B of the embodiment in which and are arranged in parallel
Is shown. Reference numeral 12 is a ball bearing, and the throttle valve shaft 11
A throttle valve opening sensor 19 is attached to the end of the.

【００２７】[0027]

【発明の効果】以上説明したように本発明の排気ガス還
流装置によれば、排気ガスの還流口に通気フードを備え
て、導入された排気ガスの流れを吸気通路の下流方向へ
案内する構成なので、内燃機関の減速操作により吸気絞
り弁の直下流に一時的に負圧が生じても、吸気通路への
排気ガス吐出口と吸気絞り弁との間の距離が離れてお
り、しかも、この負圧の作用方向と排気ガス吐出方向と
が１８０度異なっているため、吸気絞り弁への排気ガス
巻き込みが少なくなる。As described above, according to the exhaust gas recirculation system of the present invention, the exhaust gas recirculation port is provided with the ventilation hood to guide the flow of the introduced exhaust gas in the downstream direction of the intake passage. Therefore, even if a negative pressure is temporarily generated immediately downstream of the intake throttle valve due to the deceleration operation of the internal combustion engine, the distance between the exhaust gas discharge port to the intake passage and the intake throttle valve is large, and Since the acting direction of the negative pressure and the exhaust gas discharge direction are different by 180 degrees, the amount of entrained exhaust gas in the intake throttle valve is reduced.

【００２８】従って、吸気絞り弁や絞り弁軸へのデポジ
ットの付着が減少して、吸気絞り弁の絞り弁本体への固
着を防止し、安定した作動性を保持することができる。Therefore, the adhesion of the deposit to the intake throttle valve and the throttle valve shaft is reduced, the intake throttle valve is prevented from sticking to the throttle valve body, and stable operability can be maintained.

【００２９】また、通気フードと絞り弁本体との間に空
気通路を設けて、還流口本体を吸気で冷却する構成なの
で、還流口本体の絞り弁本体への圧入固着部の温度が、
絞り弁本体を形成する材料のクリープ温度以下に保た
れ、排気ガスの高温の伝導による還流口本体固着の緩み
を防止することができる。Further, since the air passage is provided between the ventilation hood and the throttle valve body to cool the return port body with intake air, the temperature of the portion of the return port body which is press-fitted and fixed to the throttle valve body is
The temperature is kept below the creep temperature of the material forming the throttle valve body, and it is possible to prevent loosening of the recirculation port body due to conduction of high temperature exhaust gas.

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

【図１】本発明の排気ガス還流装置の実施の形態を示す
縦断面図。FIG. 1 is a longitudinal sectional view showing an embodiment of an exhaust gas recirculation device of the present invention.

【図２】図１のＡ矢視図。FIG. 2 is a view on arrow A in FIG.

【図３】比較例Ａの排気ガス還流装置を示す縦断面図。3 is a vertical cross-sectional view showing an exhaust gas recirculation device of Comparative Example A. FIG.

【図４】比較例Ｂの排気ガス還流装置を示す縦断面図。FIG. 4 is a vertical sectional view showing an exhaust gas recirculation device of Comparative Example B.

【図５】還流口周辺部の温度比較図。FIG. 5 is a temperature comparison diagram around the reflux port.

【図６】本発明装置の他の実施態様を示す縦断面図。FIG. 6 is a vertical sectional view showing another embodiment of the device of the present invention.

【図７】図６のＢ矢視図。FIG. 7 is a view on arrow B of FIG.

【符号の説明】[Explanation of symbols]

１Ａ，１Ｂ 排気ガス還流装置 １０ 吸気絞り弁 １４ 絞り弁本体 １５ 吸気通路 ２０ 還流制御弁 ３０ 還流口本体 ３１ 還流口 ３５ 通気フード ４０ 空気通路 1A, 1B Exhaust gas recirculation device 10 Intake throttle valve 14 Throttle valve body 15 Intake passage 20 Reflux control valve 30 Reflux port body 31 Reflux port 35 Ventilation hood 40 Air passage

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 絞り弁本体に軸支されて吸気通路を開閉
可能な吸気絞り弁と、排気ガス還流路に連通された還流
口を開閉可能に形成されるとともに該還流口が前記吸気
絞り弁下流の吸気通路に突出開口された還流制御弁と、
を備えた排気ガス還流装置において、 前記還流制御弁の還流口は、排気ガスの流れを前記吸気
通路の下流方向へ案内する通気フードを備え、 前記通気フードと前記絞り弁本体との間に前記吸気通路
に連通する空気通路が形成されるとともに、 前記空気通路内に前記還流口外周部が露出形成されてな
る、 ことを特徴とする排気ガス還流装置。1. An intake throttle valve pivotally supported by a throttle valve main body and capable of opening and closing an intake passage, and a recirculation port communicating with an exhaust gas recirculation passage are formed to be openable and closable, and the recirculation port is the intake throttle valve. A recirculation control valve projectingly opened in the downstream intake passage,
In the exhaust gas recirculation device, the recirculation port of the recirculation control valve includes a ventilation hood that guides a flow of exhaust gas in a downstream direction of the intake passage, and the recirculation port is provided between the ventilation hood and the throttle valve body. An exhaust gas recirculation device, wherein an air passage communicating with an intake passage is formed, and the outer peripheral portion of the recirculation port is exposed and formed in the air passage.
JP17751495A 1995-07-13 1995-07-13 Exhaust gas recirculation device Expired - Fee Related JP3479756B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP17751495A JP3479756B2 (en) 1995-07-13 1995-07-13 Exhaust gas recirculation device
EP96304661A EP0753656B1 (en) 1995-07-13 1996-06-25 Exhaust gas recirculation
DE69600224T DE69600224T2 (en) 1995-07-13 1996-06-25 Exhaust gas recirculation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17751495A JP3479756B2 (en) 1995-07-13 1995-07-13 Exhaust gas recirculation device

Publications (2)

Publication Number Publication Date
JPH0932652A true JPH0932652A (en) 1997-02-04
JP3479756B2 JP3479756B2 (en) 2003-12-15

Family

ID=16032247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17751495A Expired - Fee Related JP3479756B2 (en) 1995-07-13 1995-07-13 Exhaust gas recirculation device

Country Status (1)

Country Link
JP (1) JP3479756B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010249141A (en) * 2009-04-18 2010-11-04 Mahle Internatl Gmbh Intake module incorporated with exhaust gas recirculating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010249141A (en) * 2009-04-18 2010-11-04 Mahle Internatl Gmbh Intake module incorporated with exhaust gas recirculating device

Also Published As

Publication number Publication date
JP3479756B2 (en) 2003-12-15

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