JP2012241650A - Exhaust gas reflux device - Google Patents

Exhaust gas reflux device Download PDF

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JP2012241650A
JP2012241650A JP2011113878A JP2011113878A JP2012241650A JP 2012241650 A JP2012241650 A JP 2012241650A JP 2011113878 A JP2011113878 A JP 2011113878A JP 2011113878 A JP2011113878 A JP 2011113878A JP 2012241650 A JP2012241650 A JP 2012241650A
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exhaust gas
valve
surge tank
passage
intake system
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JP5800572B2 (en
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Yasuhiro Mito
康裕 三戸
Hideki Terada
英樹 寺田
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Daihatsu Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • 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 improve stability of combustion while reducing cost by reduction in assembly man-hours and reduction in the number of components in assembling an exhaust gas reflux device with an internal combustion engine.SOLUTION: An EGR device 15 provided in an internal combustion engine and serving as the exhaust gas reflux device which refluxes an exhaust gas to the downstream of a throttle valve of an intake system includes: an EGR valve serving as an exhaust gas reflux valve for controlling a flow rate of the exhaust gas to be refluxed; a valve case 22 for accommodating the EGR valve, and in addition having a passage 22a1 communicating with a surge tank 11 serving as an inlet manifold part of the intake system on the downstream of the EGR valve; and a check valve 24 integrally provided with the valve case 22. Such a constitution is employed, that the passage 22a1 in the valve case 22 extends in a direction intersecting with the surge tank 11, and the passage 22a1 is present on the approximately same plane with the surge tank 11 or located to offset from a longitudinal center of the surge tank 11.

Description

本発明は、車両等に搭載される内燃機関に用いられる排気ガス還流装置に関する。   The present invention relates to an exhaust gas recirculation device used for an internal combustion engine mounted on a vehicle or the like.

従来、排気ガスを吸気系のスロットル弁よりも下流側に還流させる排気ガス還流装置には、還流させる排気ガスの流量を調整する排気ガス還流弁と、この排気ガス還流弁を収納するとともに吸気系に直接接続してなる弁ケースと、この弁ケースより上流側に設けられ排気ガスを冷却すべく設けられる排気ガスクーラと、排気ガス還流弁と吸気系との間に設けられる逆止弁とを備える構成が採用されてきた（例えば、特許文献１を参照）。   2. Description of the Related Art Conventionally, an exhaust gas recirculation device that recirculates exhaust gas downstream of an intake system throttle valve houses an exhaust gas recirculation valve that adjusts the flow rate of the exhaust gas to be recirculated, and the exhaust system. A valve case directly connected to the exhaust gas cooler, an exhaust gas cooler provided upstream of the valve case to cool the exhaust gas, and a check valve provided between the exhaust gas recirculation valve and the intake system. A configuration has been adopted (see, for example, Patent Document 1).

ここで、特許文献１記載の構成では、逆止弁を排気ガス還流弁と吸気系との間に別体に設けているが、このような構成では部品点数及び組立工数を多く必要とする。また、排気ガス還流弁を通過し吸気系からの新気と合流する際に、排気ガスが新気とほぼ平行な方向に流れて吸気系の吸気集合部に達することから、排気ガスと新気とが混じり合わないまま燃焼室内に達し、燃焼が不安定になることがあるという不具合も存在する。   Here, in the configuration described in Patent Document 1, the check valve is provided separately between the exhaust gas recirculation valve and the intake system, but such a configuration requires a large number of parts and assembly steps. Also, when passing through the exhaust gas recirculation valve and merging with fresh air from the intake system, the exhaust gas flows in a direction almost parallel to the fresh air and reaches the intake system intake section. There is also a problem that the combustion chamber may become unstable due to reaching the combustion chamber without being mixed.

特許第４１７１７１４号公報Japanese Patent No. 4171714

本発明は以上の点に着目し、内燃機関に排気ガス還流装置を取り付けるにあたって、組付工数及び部品点数の低減によるコスト低下を図りつつ、燃焼の安定性の向上をも図ることを目的とする。   The present invention pays attention to the above points and aims to improve the stability of combustion while reducing the cost by reducing the number of assembling steps and the number of parts when attaching the exhaust gas recirculation device to the internal combustion engine. .

すなわち本発明に係る排気ガス還流装置は、内燃機関に備えられ、排気ガスを吸気系のスロットル弁よりも下流側に還流させる排気ガス還流装置であって、還流させる排気ガスの流量を調整する排気ガス還流弁と、この排気ガス還流弁を収納するとともに排気ガス還流弁より下流側に吸気系の吸気集合部に連通する通路を有する弁ケースと、この弁ケースに一体的に設けられる逆止弁とを備え、前記弁ケース内の通路が吸気系の吸気集合部の長手方向と交差する方向に延び、前記通路が吸気系の吸気集合部の長手方向に延びる中心軸と略同一平面上にあるか、又は吸気系の吸気集合部の長手方向に延びる中心軸とオフセットするよう位置することを特徴とする。   That is, an exhaust gas recirculation device according to the present invention is an exhaust gas recirculation device that is provided in an internal combustion engine and recirculates exhaust gas downstream of an intake system throttle valve, and is an exhaust that adjusts the flow rate of the recirculated exhaust gas. A gas recirculation valve, a valve case that houses the exhaust gas recirculation valve and has a passage that communicates with an intake air collection portion on the downstream side of the exhaust gas recirculation valve, and a check valve provided integrally with the valve case And the passage in the valve case extends in a direction intersecting the longitudinal direction of the intake manifold portion of the intake system, and the passage is substantially flush with the central axis extending in the longitudinal direction of the intake manifold portion of the intake system. Or an offset from a central axis extending in the longitudinal direction of the intake air collecting portion of the intake system.

このようなものであれば、排気ガス還流弁を収納する弁ケースに逆止弁を一体的に設けているので、組付工数及び部品点数の低減によるコスト低下を図ることができる。また、前記弁ケース内の通路が吸気系の吸気集合部の長手方向と交差する方向に延び、前記通路が吸気系の吸気集合部の長手方向に延びる中心軸と略同一平面上にあるか、又は吸気系の吸気集合部の長手方向に延びる中心軸とオフセットするよう位置するので、排気ガスと新気とを従来の構成と比較してより均一に混ぜることができ、従って燃焼の安定性の向上を図ることができる。   In this case, since the check valve is integrally provided in the valve case that houses the exhaust gas recirculation valve, the cost can be reduced by reducing the number of assembling steps and the number of parts. Further, the passage in the valve case extends in a direction intersecting the longitudinal direction of the intake manifold portion of the intake system, and the passage is substantially flush with a central axis extending in the longitudinal direction of the intake manifold portion of the intake system, Or it is positioned so as to be offset from the central axis extending in the longitudinal direction of the intake manifold portion of the intake system, so that the exhaust gas and the fresh air can be mixed more uniformly compared with the conventional configuration, and therefore the stability of combustion is improved. Improvements can be made.

本発明によれば、内燃機関に排気ガス還流装置を取り付けるにあたって、組付工数及び部品点数の低減によるコスト低下を図りつつ、燃焼の安定性の向上を図ることができる。   According to the present invention, when attaching an exhaust gas recirculation device to an internal combustion engine, it is possible to improve the stability of combustion while reducing costs by reducing the number of assembling steps and the number of parts.

本発明の一実施形態に係る内燃機関を概略的に示す図。1 is a diagram schematically showing an internal combustion engine according to an embodiment of the present invention. 同実施形態に係る内燃機関の要部を示す平面図。The top view which shows the principal part of the internal combustion engine which concerns on the same embodiment. 同実施形態に係る内燃機関の要部を示す正面図。The front view which shows the principal part of the internal combustion engine which concerns on the same embodiment. 同実施形態に係る内燃機関の要部を示す側面図。The side view which shows the principal part of the internal combustion engine which concerns on the same embodiment. 本発明の他の実施形態に係る内燃機関を概略的に示す図。The figure which shows schematically the internal combustion engine which concerns on other embodiment of this invention.

本発明の一実施形態について、図１〜図４を参照しつつ以下に述べる。   An embodiment of the present invention will be described below with reference to FIGS.

本実施形態に係る内燃機関たるエンジン１００は、図１に概略的に示すように、内部にそれぞれ燃焼室を備えた２気筒を有するとともに各気筒の上部を被覆するシリンダヘッド１ａを備えたエンジン本体１と、エンジン本体１の各気筒に空気を供給する吸気系２と、エンジン本体１からの排気ガスを外部に排出するための排気系３と、排気ガスで駆動されるタービン５及びタービン５に回転軸で接続されるコンプレッサ６を備えるターボチャージャ４とを備えている。吸気系は、上流側から順に、エアクリーナ７と、コンプレッサ６と、コンプレッサ６から吐き出される過給空気を冷却するインタークーラ８と、エンジン本体１に供給する過給空気の流量を制御するスロットル弁９と、吸気集合部たるサージタンク１１及び分岐管１２を一体に有するインテークマニホルド１０とを備えている。一方、排気系には、上流側から順に、エキゾーストマニホルド１３と、タービン５と、三元触媒１４とを備えている。なお、エキゾーストマニホルド１３の上流側の部位は、シリンダヘッド１ａ内に形成している。加えて、このエンジン１００は、排気系のエキゾーストマニホルド１３からの排気ガスの一部を吸気系のスロットル弁９よりも下流側に還流させて吸入空気に混合するための排気ガス還流装置たるＥＧＲ装置１５を備えている。なお、図２〜図４においては、エンジン本体１は想像線により示している。   An engine 100, which is an internal combustion engine according to the present embodiment, has two cylinders each provided with a combustion chamber therein and a cylinder head 1a that covers the upper part of each cylinder, as schematically shown in FIG. 1, an intake system 2 for supplying air to each cylinder of the engine body 1, an exhaust system 3 for exhausting exhaust gas from the engine body 1, and a turbine 5 and a turbine 5 driven by the exhaust gas And a turbocharger 4 having a compressor 6 connected by a rotating shaft. The intake system includes, in order from the upstream side, an air cleaner 7, a compressor 6, an intercooler 8 that cools the supercharged air discharged from the compressor 6, and a throttle valve 9 that controls the flow rate of the supercharged air supplied to the engine body 1. And an intake manifold 10 integrally having a surge tank 11 and a branch pipe 12 as an intake air collecting portion. On the other hand, the exhaust system includes an exhaust manifold 13, a turbine 5, and a three-way catalyst 14 in order from the upstream side. The upstream portion of the exhaust manifold 13 is formed in the cylinder head 1a. In addition, this engine 100 is an EGR device that is an exhaust gas recirculation device for recirculating a part of exhaust gas from the exhaust system exhaust manifold 13 to the downstream side of the intake system throttle valve 9 and mixing it with intake air. 15 is provided. 2 to 4, the engine body 1 is indicated by an imaginary line.

このＥＧＲ装置１５は、図１〜図４に示すように、還流させる排気ガスの流量を調整する排気ガス還流弁たるＥＧＲ弁２１と、このＥＧＲ弁２１を収納するとともにサージタンク１１に直接接続してなる弁ケース２２と、この弁ケース２２に一体的に取り付けられる逆止弁２４と、前記弁ケース２２内部と排気系のエキゾーストマニホルド１３とを接続する管路である排気ガスクーラ２３とを備えている。   As shown in FIGS. 1 to 4, the EGR device 15 houses an EGR valve 21, which is an exhaust gas recirculation valve for adjusting the flow rate of exhaust gas to be recirculated, and the EGR valve 21 and is directly connected to the surge tank 11. And a check valve 24 that is integrally attached to the valve case 22, and an exhaust gas cooler 23 that is a pipe line that connects the inside of the valve case 22 and the exhaust manifold 13 of the exhaust system. Yes.

ＥＧＲ弁２１は、図３に示すように、前記弁ケース２２に形成した弁座２２ｘに着座し排気ガスの流通を遮断する閉止位置と前記弁座２２ｘから離間し排気ガスの流通を許可する全開位置との間で移動可能なポペット弁である。このＥＧＲ弁２１は、前記弁ケース２２に取り付けてなるアクチュエータ２２ｃにより駆動される。このアクチュエータ２２ｃは、外部に備えた図示しない電子制御装置からの信号を受け付けることにより、ＥＧＲ弁２１の弁体を駆動する電磁弁である。   As shown in FIG. 3, the EGR valve 21 is seated on a valve seat 22x formed in the valve case 22 and is closed from the valve seat 22x and fully opened to allow the exhaust gas to flow. A poppet valve movable between positions. The EGR valve 21 is driven by an actuator 22c attached to the valve case 22. The actuator 22c is an electromagnetic valve that drives the valve body of the EGR valve 21 by receiving a signal from an electronic control device (not shown) provided outside.

弁ケース２２は、上述したように、また図３に示すように、内部にＥＧＲ弁２１を収納している。また、この弁ケース２２の内部には、図２及び図３に示すように、一端部を前記排気ガスクーラ２３に接続し、他端部を吸気系の吸気集合部たるサージタンク１１に接続してなる排気ガス流通路２２ａを設けている。この排気ガス流通路２２ａの途中には、閉止位置にあるＥＧＲ弁２１を着座させるための前記弁座２２ｘを設けている。ここで、排気ガス流通路２２ａのうち弁座２２ｘよりも下流側の部分２２ａ１は、サージタンク１１の長手方向に延びる中心軸と略同一平面上にあり、該サージタンク１１の長手方向と交差する方向に延びている。そして、図２に示すように、この排気ガス流通路２２ａの下流端側とサージタンク１１とを接続する接続面２２ｂは、サージタンク１１に一体に設けた分岐管１２とエンジン本体１のシリンダヘッド１ａとを接続する接続面１２ａと平行である。   As described above, as shown in FIG. 3, the valve case 22 houses the EGR valve 21 therein. As shown in FIGS. 2 and 3, one end of the valve case 22 is connected to the exhaust gas cooler 23, and the other end is connected to the surge tank 11 serving as an intake air collecting portion of the intake system. An exhaust gas flow passage 22a is provided. In the middle of the exhaust gas flow passage 22a, the valve seat 22x for seating the EGR valve 21 in the closed position is provided. Here, the portion 22a1 downstream of the valve seat 22x in the exhaust gas flow passage 22a is substantially flush with the central axis extending in the longitudinal direction of the surge tank 11, and intersects the longitudinal direction of the surge tank 11. Extending in the direction. As shown in FIG. 2, the connecting surface 22 b that connects the downstream end side of the exhaust gas flow passage 22 a and the surge tank 11 includes a branch pipe 12 that is provided integrally with the surge tank 11 and a cylinder head of the engine body 1. It is parallel to the connection surface 12a that connects 1a.

逆止弁２４は、図２及び図３に示すように、前記弁ケース２２の下流側の端部に一体的に取り付けられる。また、この逆止弁２４は、吸気の流れの上流側の端部を弁ケース２２に枢着して固定端２４ａとしているとともに、下流側の端部を自由端としている板状の部材である。さらに、この逆止弁２４は、サージタンク１１内の圧力が排気系のエキゾーストマニホルド１３内の圧力を上回る場合に、圧力差により自由端が弁ケース２２に接する閉止位置側に付勢されるよう構成している。そして、この逆止弁２４を通過した排気ガスは、サージタンク１１内において新気の流れに対して角度を有する方向に流れ、新気と混合した状態でエンジン本体１の各シリンダ内に導かれる。   As shown in FIGS. 2 and 3, the check valve 24 is integrally attached to the downstream end of the valve case 22. The check valve 24 is a plate-like member having an upstream end portion of intake air flow pivotally attached to the valve case 22 as a fixed end 24a and a downstream end portion being a free end. . Further, when the pressure in the surge tank 11 exceeds the pressure in the exhaust system exhaust manifold 13, the check valve 24 is urged toward the closed position where the free end contacts the valve case 22 due to the pressure difference. It is composed. The exhaust gas that has passed through the check valve 24 flows in a direction having an angle with respect to the flow of fresh air in the surge tank 11, and is introduced into each cylinder of the engine body 1 in a state of being mixed with fresh air. .

排気ガスクーラ２３は、図２、図３及び図４に示すように、一端部を排気系のエグゾーストマニホルド１３に接続してなるとともに、他端部を弁ケース２２に接続してなる管路である。排気ガスは、この排気ガスクーラ２３を通過することにより外気と熱交換を行い冷却される。また、本実施形態では、排気ガス中に含まれる水蒸気が凝縮して発生する水分を回収させるべく、排気系側すなわち上流側よりも弁ケース２２側すなわち下流側が上方となるような傾斜を有する。そして、図示は省略するが、上流側に、水分を回収するための排水口を設けている。この排水口は、図示しない排水管路を経てサージタンク１１に連通している。   As shown in FIGS. 2, 3, and 4, the exhaust gas cooler 23 is a pipe line having one end connected to the exhaust manifold 13 of the exhaust system and the other end connected to the valve case 22. . The exhaust gas passes through the exhaust gas cooler 23 and is cooled by exchanging heat with the outside air. Further, in the present embodiment, in order to collect moisture generated by condensation of water vapor contained in the exhaust gas, the valve case 22 side, that is, the downstream side has an inclination higher than the exhaust system side, that is, the upstream side. And although illustration is abbreviate | omitted, the drain outlet for collect | recovering water | moisture contents is provided in the upstream. The drain port communicates with the surge tank 11 via a drain pipe (not shown).

すなわち、一方の気筒の燃焼室から排気弁を経て排出される排気ガスの一部は、シリンダヘッド１ａ内のエグゾーストマニホルド１３からＥＧＲ装置６の排気ガスクーラ２３に導かれ、排気ガスクーラ２３内を流通する間に外気と熱交換を行うことにより冷却される。それから、排気ガスは弁ケース２２内に導かれ、ＥＧＲ弁２１が開放位置に位置している場合には弁ケース２２内の排気ガス流通路２２ａを経て逆止弁２４の直前に達する。そして、サージタンク１１内の圧力がエグゾーストマニホルド１３内の圧力を上回らない場合には、圧力差により逆止弁２４が開弁して排気ガスがサージタンク１１内に導入される。   That is, a part of the exhaust gas discharged from the combustion chamber of one cylinder through the exhaust valve is led from the exhaust manifold 13 in the cylinder head 1 a to the exhaust gas cooler 23 of the EGR device 6 and circulates in the exhaust gas cooler 23. It is cooled by exchanging heat with the outside air. Then, the exhaust gas is guided into the valve case 22 and reaches the point just before the check valve 24 via the exhaust gas flow passage 22a in the valve case 22 when the EGR valve 21 is located at the open position. When the pressure in the surge tank 11 does not exceed the pressure in the exhaust manifold 13, the check valve 24 is opened due to the pressure difference, and the exhaust gas is introduced into the surge tank 11.

以上に述べたように、本実施形態のＥＧＲ装置１５の構成によれば、ＥＧＲ弁２１を収納する弁ケース２２に逆止弁２４を一体的に設けているので、組付工数及び部品点数の低減によるコスト低下を図ることができる。また、前記弁ケース２２内の通路２２ａがサージタンク１１の長手方向と交差する方向に延び、かつ前記通路２２ａがサージタンク１１の長手方向に延びる中心軸と略同一平面上にあるので、排気ガスと新気とを従来の構成と比較してより均一に混ぜることができ、従って燃焼の安定性の向上を図ることができる。さらに、シリンダヘッド１ａ内部のエグゾーストマニホルド１３と排気ガスクーラ２３と、また、排気ガスクーラ２３と弁ケース２２とをそれぞれ直接接続しているとともに、弁ケース２２とサージタンク１１とをも直接接続しているので、この点からも組付工数及び部品点数の低減によるコスト低下を図ることができる。そして、弁ケース２２とサージタンク１１とを直接接続しているので、ＥＧＲ弁２１とインテークマニホルド１０との間の経路が短くなり、排気ガスに含まれる凝縮水をＥＧＲ装置１５内にたまりにくくすることもできる。   As described above, according to the configuration of the EGR device 15 of the present embodiment, since the check valve 24 is integrally provided in the valve case 22 that houses the EGR valve 21, the number of assembling steps and the number of parts can be reduced. Cost reduction due to reduction can be achieved. Further, since the passage 22a in the valve case 22 extends in a direction intersecting the longitudinal direction of the surge tank 11, and the passage 22a is substantially flush with the central axis extending in the longitudinal direction of the surge tank 11, the exhaust gas And fresh air can be mixed more uniformly as compared with the conventional structure, and therefore the stability of combustion can be improved. Further, the exhaust manifold 13 and the exhaust gas cooler 23 inside the cylinder head 1a are directly connected to the exhaust gas cooler 23 and the valve case 22, respectively, and the valve case 22 and the surge tank 11 are also directly connected to each other. Therefore, also from this point, the cost can be reduced by reducing the number of assembling steps and the number of parts. Since the valve case 22 and the surge tank 11 are directly connected, the path between the EGR valve 21 and the intake manifold 10 is shortened, and the condensed water contained in the exhaust gas is less likely to accumulate in the EGR device 15. You can also.

なお、本発明は以上に述べた実施形態に限らない。   The present invention is not limited to the embodiment described above.

例えば、弁ケースとサージタンクとの接続態様に、図５を参照しつつ以下に述べるような態様を採用してもよい。なお、以下の説明において、図１〜図４を参照しつつ前述した実施態様に係るものに対応する各部位には、それぞれ同一の名称を付し、前述した実施態様に係るものの先頭にＡを付加した符号を付している。   For example, an aspect described below with reference to FIG. 5 may be adopted as a connection aspect between the valve case and the surge tank. In the following description, parts corresponding to those according to the embodiment described above with reference to FIGS. 1 to 4 are given the same names, and A at the head of those according to the embodiment described above. The added code is attached.

この態様では、弁ケースＡ２２内の排気ガス流通路が吸気系の吸気集合部たるサージタンクＡ１１と交差する方向に延びているとともに、サージタンクＡ１１の長手方向軸中心とオフセットするように配している。   In this aspect, the exhaust gas flow passage in the valve case A22 extends in a direction intersecting with the surge tank A11 that is the intake manifold portion of the intake system, and is arranged so as to be offset from the longitudinal axis center of the surge tank A11. Yes.

この排気ガス流通路を通過した排気ガスは、サージタンクＡ１１内の圧力が排気系内の圧力を上回らず圧力差により逆止弁Ａ２４が開弁している場合、サージタンクＡ１１の内壁に沿って螺旋状に流れ、下流側に進むにつれ新気と混合される。   Exhaust gas that has passed through this exhaust gas flow passage is along the inner wall of the surge tank A11 when the pressure in the surge tank A11 does not exceed the pressure in the exhaust system and the check valve A24 is opened due to the pressure difference. It flows spirally and mixes with fresh air as it travels downstream.

すなわち、この態様を採用した場合も、サージタンクＡ１１内において排気ガスと新気とを従来の構成と比較してより均一に混ぜることができ、従って燃焼の安定性の向上を図ることができる。   That is, even when this mode is adopted, the exhaust gas and the fresh air can be mixed more uniformly in the surge tank A11 as compared with the conventional configuration, and therefore the combustion stability can be improved.

その他、本発明の趣旨を損ねない範囲で種々に変形してよい。   In addition, various modifications may be made without departing from the spirit of the present invention.

１１…サージタンク（吸気集合部）
１５…ＥＧＲ装置（排気ガス還流装置）
２１…ＥＧＲ弁（排気ガス還流弁）
２２…弁ケース
２２ａ…排気ガス流通路
２４…逆止弁 11 ... Surge tank (intake air collecting part)
15 ... EGR device (exhaust gas recirculation device)
21 ... EGR valve (exhaust gas recirculation valve)
22 ... Valve case 22a ... Exhaust gas flow passage 24 ... Check valve

Claims (1)

内燃機関に備えられ、排気ガスを吸気系のスロットル弁よりも下流側に還流させる排気ガス還流装置であって、
還流させる排気ガスの流量を調整する排気ガス還流弁と、この排気ガス還流弁を収納するとともに排気ガス還流弁より下流側に吸気系の吸気集合部に連通する通路を有する弁ケースと、この弁ケースに一体的に設けられる逆止弁とを備え、
前記弁ケース内の通路が吸気系の吸気集合部の長手方向と交差する方向に延び、
前記通路が吸気系の吸気集合部の長手方向に延びる中心軸と略同一平面上にあるか、又は吸気系の吸気集合部の長手方向に延びる中心軸とオフセットするよう位置することを特徴とする排気ガス還流装置。 An exhaust gas recirculation device that is provided in an internal combustion engine and recirculates exhaust gas downstream of an intake system throttle valve,
An exhaust gas recirculation valve that adjusts the flow rate of the exhaust gas to be recirculated, a valve case that houses the exhaust gas recirculation valve and has a passage that communicates with the intake air collecting portion of the intake system downstream from the exhaust gas recirculation valve; A check valve provided integrally with the case,
The passage in the valve case extends in a direction intersecting the longitudinal direction of the intake manifold portion of the intake system,
The passage is located substantially on the same plane as the central axis extending in the longitudinal direction of the intake manifold portion of the intake system, or is positioned to be offset from the central axis extending in the longitudinal direction of the intake manifold portion of the intake system. Exhaust gas recirculation device.
JP2011113878A 2011-05-20 2011-05-20 Exhaust gas recirculation device Expired - Fee Related JP5800572B2 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0252950U (en) * 1988-10-07 1990-04-17
JPH11210564A (en) * 1998-01-26 1999-08-03 Nissan Motor Co Ltd Exhaust gas recirculation system for engine
JP2002021646A (en) * 2000-07-04 2002-01-23 Mitsubishi Motors Corp Exhaust gas recirculation device
JP2004100653A (en) * 2002-09-12 2004-04-02 Aichi Mach Ind Co Ltd Intake manifold
JP2008014265A (en) * 2006-07-07 2008-01-24 Yamaha Motor Co Ltd Spark ignition type multiple cylinder engine
JP4171714B2 (en) * 2004-03-26 2008-10-29 株式会社クボタ Turbocharged engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0252950U (en) * 1988-10-07 1990-04-17
JPH11210564A (en) * 1998-01-26 1999-08-03 Nissan Motor Co Ltd Exhaust gas recirculation system for engine
JP2002021646A (en) * 2000-07-04 2002-01-23 Mitsubishi Motors Corp Exhaust gas recirculation device
JP2004100653A (en) * 2002-09-12 2004-04-02 Aichi Mach Ind Co Ltd Intake manifold
JP4171714B2 (en) * 2004-03-26 2008-10-29 株式会社クボタ Turbocharged engine
JP2008014265A (en) * 2006-07-07 2008-01-24 Yamaha Motor Co Ltd Spark ignition type multiple cylinder engine

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