JPH07253053A - Exhaust gas recirculation device of engine - Google Patents
Exhaust gas recirculation device of engineInfo
- Publication number
- JPH07253053A JPH07253053A JP6043506A JP4350694A JPH07253053A JP H07253053 A JPH07253053 A JP H07253053A JP 6043506 A JP6043506 A JP 6043506A JP 4350694 A JP4350694 A JP 4350694A JP H07253053 A JPH07253053 A JP H07253053A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- port
- valve
- gas recirculation
- exhaust
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/16—Indirect injection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、エンジンの排気ガス
中のＮＯX を低減させる排ガス再循環装置（以下、ＥＧ
Ｒ装置という）に関し、特に排ガス還流通路の配管を不
要にして、コスト低減を図る技術に関する。BACKGROUND OF THE INVENTION This invention is an exhaust gas recirculation apparatus for reducing NO X in the exhaust gas of the engine (hereinafter, EG
R device), and particularly to a technique for reducing costs by eliminating the need for piping in the exhaust gas recirculation passage.
【０００２】[0002]
【従来の技術】この種のＥＧＲ装置としては、従来より
例えば図３中符号１０で示すものがある。それはエンジ
ンＥの吸気ポート４と排気ポート５とをＥＧＲ制御弁１
２を有する排ガス還流通路１１で連通して構成されてい
る。この従来例はシリンダヘッド２の外に排ガス還流通
路１１を配管して構成されている。このＥＧＲ装置１０
を付設することにより、特に高負荷運転時に排気ガスを
吸気に還流させてＮＯXの排出を低減させ、最高燃焼温
度を下げるのに効果的である。2. Description of the Related Art As an EGR device of this type, there is a conventional device shown by reference numeral 10 in FIG. It connects the intake port 4 and the exhaust port 5 of the engine E to the EGR control valve 1
An exhaust gas recirculation passage 11 having two is connected to each other. In this conventional example, an exhaust gas recirculation passage 11 is arranged outside the cylinder head 2. This EGR device 10
By attaching a particularly refluxed exhaust gas to the intake at high load operation to reduce the emission of the NO X and is effective to lower the maximum combustion temperature.
【０００３】なお、このエンジンＥは一部油冷式強制空
冷ディーゼルエンジンであり、フライホイルファン２１
で起こした冷却風Ａを、ファンケース２２で案内して、
シリンダの外周、シリンダヘッド２に形成されたトンネ
ル式冷却風路３、及び放熱器２０に向けて分流させるよ
うに構成されている。また、シリンダヘッド２内の副燃
焼室８の外周には油冷室９が形成され、潤滑油がオイル
パンから油冷室９に圧送されて副燃焼室８を冷却し、放
熱器２０を経て放熱し、再びオイルパンへ還流するよう
に構成されている。Incidentally, the engine E is a partially oil-cooled forced air-cooled diesel engine, and the flywheel fan 21
Guide the cooling air A generated in step 2 with the fan case 22,
The flow is divided toward the outer periphery of the cylinder, the tunnel-type cooling air passage 3 formed in the cylinder head 2, and the radiator 20. Further, an oil cooling chamber 9 is formed on the outer periphery of the sub combustion chamber 8 in the cylinder head 2, and lubricating oil is pumped from the oil pan to the oil cooling chamber 9 to cool the sub combustion chamber 8 and pass through the radiator 20. The heat is radiated and the oil is returned to the oil pan again.
【０００４】[0004]
【発明が解決しようとする課題】上記従来例では、エン
ジンＥの吸気ポート４と排気ポート５とを連通する排ガ
ス還流通路１１が、シリンダヘッド２の外に配管されて
いることから、その配管のための部品点数が増え、コス
ト低減を図るうえで障害になる。また、この種のＥＧＲ
装置によれば、還流排気ガスにより吸気を暖めて冷始動
後のエンジンの暖機運転を促進するとともに、白煙の発
生を抑制することができるとされているが、上記従来例
の配管構造は、排ガス還流通路１１を流通する間に還流
排気ガスの温度が大幅に低下するため、エンジンの暖機
運転を促進し、白煙の発生を抑制するうえで障害にな
る。本発明はこのような事情を考慮してなされたもの
で、 上記配管を無くして部品点数の削減とコスト低減を
図ること、 冷始動後の暖機運転の促進と白煙の防止を効果的に
達成すること、を技術課題とする。In the above-mentioned conventional example, the exhaust gas recirculation passage 11 that connects the intake port 4 and the exhaust port 5 of the engine E is piped outside the cylinder head 2. As a result, the number of parts used for this purpose increases, which is an obstacle to cost reduction. Also, this kind of EGR
According to the device, it is said that the intake air can be warmed by the recirculated exhaust gas to promote the warm-up operation of the engine after the cold start, and the generation of white smoke can be suppressed. Since the temperature of the recirculated exhaust gas significantly decreases while flowing through the exhaust gas recirculation passage 11, it becomes an obstacle in promoting warm-up operation of the engine and suppressing generation of white smoke. The present invention has been made in consideration of such circumstances, and effectively eliminates the above-mentioned piping to reduce the number of parts and costs, promotes warm-up operation after cold start and prevents white smoke. Achievement is a technical issue.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明が採用した手段は、エンジンＥの吸気ポート
４と排気ポート５とをＥＧＲ制御弁１２を有する排ガス
還流通路１１で連通して構成したエンジンの排ガス再循
環装置において、上記吸気ポート４の吸気弁口４ａと排
気ポート５の排気弁口５ａとの間の弁口間肉壁６に上記
ＥＧＲ制御弁１２を有する排ガス還流通路１１を形成
し、上記吸気弁口４ａと排気弁口５ａとを上記排ガス還
流通路１１で連通したことを特徴とするものである。In order to solve the above-mentioned problems, the means adopted by the present invention is to connect the intake port 4 and the exhaust port 5 of the engine E with an exhaust gas recirculation passage 11 having an EGR control valve 12. In the exhaust gas recirculation system for an engine configured as described above, an exhaust gas recirculation passage having the EGR control valve 12 on a wall wall 6 between valve intake ports 4a of the intake port 4 and an exhaust valve port 5a of the exhaust port 5 11 is formed, and the intake valve port 4a and the exhaust valve port 5a are communicated with each other through the exhaust gas recirculation passage 11.
【０００６】[0006]
【発明の作用・効果】本発明では、吸気ポート４の吸気
弁口４ａと排気ポート５の排気弁口５ａとの間の弁口間
肉壁６にＥＧＲ制御弁１２を有する排ガス還流通路１１
を形成し、吸気弁口４ａと排気弁口５ａとを上記排ガス
還流通路１１で連通したことから、シリンダヘッド２の
外に配管する必要はなく、部品点数の削減とコスト低減
を図ることができる。また、吸気弁口４ａと排気弁口５
ａとは排ガス還流通路１１によって最短距離で連通され
るので、この排ガス還流通路１１を流通する間に還流排
気ガスの温度が大幅に低下することは避けられる。これ
により、冷始動後のエンジンの暖機運転を促進し、白煙
の防止を効果的に達成することができる。According to the present invention, the exhaust gas recirculation passage 11 having the EGR control valve 12 on the inter-valve wall 6 between the intake valve port 4a of the intake port 4 and the exhaust valve port 5a of the exhaust port 5 is provided.
Since the intake valve opening 4a and the exhaust valve opening 5a are communicated with each other through the exhaust gas recirculation passage 11, it is not necessary to provide piping outside the cylinder head 2, and the number of parts and cost can be reduced. . Further, the intake valve port 4a and the exhaust valve port 5
Since it is communicated with a by the exhaust gas recirculation passage 11 at the shortest distance, it is possible to prevent the temperature of the recirculated exhaust gas from significantly decreasing while flowing through the exhaust gas recirculation passage 11. As a result, the warm-up operation of the engine after the cold start can be promoted, and the white smoke can be effectively prevented.
【０００７】[0007]
【実施例】以下本発明の実施例を図面に基づいてさらに
詳しく説明する。図１は本発明の第１の実施例に係るデ
ィーゼルエンジンの要部横断平面図、図２は図１のII−
II線矢視縦断面図である。このエンジンＥは前記従来例
と同様に一部油冷式強制空冷の頭上弁ディーゼルエンジ
ンとして構成されている。即ち、このエンジンＥは、エ
ンジン本体１の前側に設けたフライホイルファン２１及
びファンケース２２と、シリンダヘッド２の前側上部に
設けたオイルクーラ（放熱器）２０と、シリンダヘッド
２に貫通形成したトンネル式冷却風路３と、油冷室９と
を具備して成り、フライホイルファン２１で起こした冷
却風Ａを、ファンケース２２で案内してシリンダブロッ
ク、トンネル式冷却風路３及び放熱器２０に向けて分流
させ、また、潤滑油をオイルパンから給油路７を経て油
冷室９に圧送し、副燃焼室８を冷却してから放熱器２０
を経て放熱させ、再びオイルパンへ還流させるように構
成されている。Embodiments of the present invention will now be described in more detail with reference to the drawings. 1 is a cross-sectional plan view of a main part of a diesel engine according to a first embodiment of the present invention, and FIG.
It is a vertical cross-sectional view taken along the line II. This engine E is configured as an oil-cooled forced air-cooled overhead valve diesel engine similar to the conventional example. That is, the engine E is formed by penetrating through the cylinder head 2 with a flywheel fan 21 and a fan case 22 provided on the front side of the engine body 1, an oil cooler (radiator) 20 provided on the upper front side of the cylinder head 2. The tunnel-type cooling air passage 3 and the oil cooling chamber 9 are provided, and the cooling air A generated by the flywheel fan 21 is guided by the fan case 22 to the cylinder block, the tunnel-type cooling air passage 3, and the radiator. 20, the lubricating oil is pressure-fed from the oil pan to the oil cooling chamber 9 via the oil supply passage 7 to cool the auxiliary combustion chamber 8, and then the radiator 20
It is configured to radiate heat after passing through and return to the oil pan again.
【０００８】本発明の特徴をなすＥＧＲ装置１０は、図
１及び図２に示すように、吸気ポート４の吸気弁口４ａ
と排気ポート５の排気弁口５ａとの間の弁口間肉壁６に
ＥＧＲ制御弁１２を有する排ガス還流通路１１を形成
し、この排ガス還流通路１１で吸気弁口４ａと排気弁口
５ａとを連通するように構成されている。上記吸気ポー
ト４は、吸気弁口４ａからシリンダヘッド２の横一側に
導出され、排気ポート５は吸気ポート４と略直交するよ
うに排気弁口５ａからシリンダヘッド２の後方横一側に
導出されている。上記トンネル式冷却風路３は、吸気弁
口４ａと排気弁口５ａとに隣接する位置でシリンダボア
１８の一端部上側に、シリンダヘッド２を前後方向へ貫
通して形成され、また、副燃焼室８は、上記トンネル式
冷却風路３とは反対側の位置で、シリンダボア１８の他
端部上側に形成されている。As shown in FIGS. 1 and 2, the EGR device 10 which is a feature of the present invention has an intake valve port 4a of the intake port 4.
The exhaust gas recirculation passage 11 having the EGR control valve 12 is formed in the inter-valve wall 6 between the exhaust port 5a of the exhaust port 5 and the exhaust port 5a. Are configured to communicate with each other. The intake port 4 is led out to one lateral side of the cylinder head 2 from the intake valve port 4a, and the exhaust port 5 is led out to one lateral rear side of the cylinder head 2 from the exhaust valve port 5a so as to be substantially orthogonal to the intake port 4. Has been done. The tunnel-type cooling air passage 3 is formed at a position adjacent to the intake valve opening 4a and the exhaust valve opening 5a above one end of the cylinder bore 18 so as to pass through the cylinder head 2 in the front-rear direction, and also to the auxiliary combustion chamber. Reference numeral 8 is a position opposite to the tunnel-type cooling air passage 3 and is formed above the other end of the cylinder bore 18.
【０００９】上記排ガス還流通路１１は、図１及び図２
で示すように、前記弁口間肉壁６に吸気ポート５側より
キリ１９で孔加工して貫通形成される。この排ガス還流
通路１１にはＥＧＲ制御弁１２を構成する弁軸１３がヘ
ッドカバー１７側より垂直に組み込まれている。上記Ｅ
ＧＲ制御弁１２は、排ガス還流通路１１に臨む位置に開
口１４を有する弁軸１３と、この弁軸１３の上部の操作
レバー１５を回動操作するアクチュエータ１６とから成
り、アクチュエータ１６が上記弁軸１３を回動操作する
ことにより、排ガス還流通路１１に臨む開口１４の有効
面積を調量して還流排気ガスの還流率を制御するように
構成されている。なお、上記ＥＧＲ制御弁１２は、必ず
しも開口１４の有効面積を調量するものに限らず、エン
ジンの冷始動時の暖機運転時や高負荷運転時にのみ上記
排ガス還流通路１１を開くものでもよい。また、上記ア
クチュエータ１６としては吸気負圧で作動するダイヤフ
ラム弁、暖機温度の検出に基づき電子制御回路を介して
作動するステッピングモータや電磁弁等を用いることが
できる。The exhaust gas recirculation passage 11 is shown in FIGS.
As shown in FIG. 5, a hole 19 is drilled from the intake port 5 side in the wall wall 6 between the valve openings to form a through hole. In the exhaust gas recirculation passage 11, a valve shaft 13 that constitutes an EGR control valve 12 is vertically installed from the head cover 17 side. E above
The GR control valve 12 is composed of a valve shaft 13 having an opening 14 at a position facing the exhaust gas recirculation passage 11, and an actuator 16 for rotating an operating lever 15 above the valve shaft 13, and the actuator 16 is the valve shaft. By rotating 13 the effective area of the opening 14 facing the exhaust gas recirculation passage 11 is adjusted to control the recirculation rate of the recirculated exhaust gas. The EGR control valve 12 is not limited to one that adjusts the effective area of the opening 14, and may open the exhaust gas recirculation passage 11 only during warm-up operation during cold start of the engine or during high-load operation. . Further, as the actuator 16, a diaphragm valve that operates with negative intake pressure, a stepping motor that operates via an electronic control circuit based on detection of warm-up temperature, a solenoid valve, or the like can be used.
【００１０】上記構成により、シリンダヘッド２の外に
従来例のような配管をする必要はなく、部品点数の削減
とコスト低減を図ることができる。また、吸気弁口４ａ
と排気弁口５ａとは排ガス還流通路１１によって最短距
離で連通され、この排ガス還流通路１１を流通する間に
還流排気ガスの温度が大幅に低下することは避けられる
ので、冷始動後のエンジンの暖機運転を促進し、白煙の
防止を効果的に達成することができる。With the above structure, it is not necessary to provide piping outside the cylinder head 2 as in the conventional example, and the number of parts and cost can be reduced. In addition, the intake valve port 4a
And the exhaust valve port 5a are communicated with each other by the exhaust gas recirculation passage 11 at the shortest distance, and it is possible to prevent the temperature of the recirculated exhaust gas from significantly decreasing while flowing through the exhaust gas recirculation passage 11. The warm-up operation can be promoted and the prevention of white smoke can be effectively achieved.
【００１１】なお、上記弁口間肉壁６には図２で示すよ
うに、排ガス還流通路１１の下側に潤滑油を油冷室９に
圧送する給油路７が貫通形成されており、エンジンの高
負荷運転時には、上記給油路７を介して吸気ポート４へ
の還流排気ガスを適度に冷却する。これにより、還流排
気ガスの密度が増し、見かけの流量は同じでも多くの排
気ガスを還流できる。従って、排ガス還流通路１１の有
効断面積を小さくできるので、弁口間肉壁６に狭い排ガ
ス還流通路１１を形成した場合でもその必要断面積を十
分に確保でき、排気ガス中のＮＯX を効果的に低減させ
る。As shown in FIG. 2, an oil supply passage 7 for pumping the lubricating oil to the oil cooling chamber 9 is formed through the lower wall of the exhaust gas recirculation passage 11 in the wall 6 between the valve openings, and During the high load operation, the recirculated exhaust gas to the intake port 4 is appropriately cooled via the oil supply passage 7. As a result, the density of the recirculated exhaust gas is increased, and a large amount of exhaust gas can be recirculated even if the apparent flow rate is the same. Therefore, since the effective cross-sectional area of the exhaust gas recirculation passage 11 can be reduced, the required cross-sectional area even in the case of forming a narrow exhaust gas recirculation passage 11 to the valve port between the meat wall 6 can be sufficiently ensured, the NO X in the exhaust gas effectively To reduce.
【００１２】図３は本発明の第２の実施例に係るディー
ゼルエンジンの要部横断平面図である。この実施例で
は、図３に示すように、弁口間肉壁６の中央部が薄く形
成され、この弁口間肉壁６に縦向きに（シリンダヘッド
２の頂部側より）キリ孔１９ａを加工し、このキリ孔１
９ａに前記弁軸１３をヘッドカバー１７側から垂直に組
み込んである。この実施例では、キリ孔１９ａは前後一
対の円弧形状をなし、弁軸１３の開口１４は、キリ孔１
９ａで適度に塞がれて有効面積が調量されることにな
る。そして弁軸１３の開口１４が排ガス還流通路１１を
形成する。その他の点は図１及び図２と同様に構成され
ている。なお、本発明はディーゼルエンジンに限るもの
ではなく、ガソリンエンジンについても、適宜変更を加
えて実施し得ることは、多言を要しない。FIG. 3 is a cross-sectional plan view of essential parts of a diesel engine according to a second embodiment of the present invention. In this embodiment, as shown in FIG. 3, the central portion of the inter-valve wall 6 is formed thin, and a perforation hole 19a is formed in the longitudinal wall 6 (from the top side of the cylinder head 2) in the vertical direction. Processed and drilled 1
9a, the valve shaft 13 is vertically assembled from the head cover 17 side. In this embodiment, the drill hole 19a has a pair of front and rear circular arc shapes, and the opening 14 of the valve shaft 13 has the drill hole 1a.
It is appropriately blocked by 9a and the effective area is measured. The opening 14 of the valve shaft 13 forms the exhaust gas recirculation passage 11. The other points are the same as those in FIGS. 1 and 2. It should be noted that the present invention is not limited to the diesel engine, and it is not necessary to say that the gasoline engine can be implemented with appropriate modifications.
【図１】本発明の第１の実施例に係るディーゼルエンジ
ンの要部横断平面図である。FIG. 1 is a cross-sectional plan view of essential parts of a diesel engine according to a first embodiment of the present invention.
【図２】図１中のII−II線矢視縦断面図である。FIG. 2 is a vertical sectional view taken along the line II-II in FIG.
【図３】本発明の第２の実施例に係るディーゼルエンジ
ンの要部横断平面図である。FIG. 3 is a cross-sectional plan view of main parts of a diesel engine according to a second embodiment of the present invention.
【図４】従来例に係るディーゼルエンジンの要部横断平
面図である。FIG. 4 is a cross-sectional plan view of a main part of a diesel engine according to a conventional example.
Ｅ…エンジン、 ４…吸気ポート、
４ａ…吸気弁口、５…排気ポート、 ５ａ…排
気弁口、 ６…弁口間肉壁、１０…排ガス再循環
装置、 １１…排ガス還流通路、 １２…ＥＧＲ制御
弁。E ... Engine, 4 ... Intake port,
4a ... Intake valve port, 5 ... Exhaust port, 5a ... Exhaust valve port, 6 ... Inter-valve wall, 10 ... Exhaust gas recirculation device, 11 ... Exhaust gas recirculation passageway, 12 ... EGR control valve.
Claims (1)
ート(５)とをＥＧＲ制御弁(12)を有する排ガス還流通路
(11)で連通して構成したエンジンの排ガス再循環装置に
おいて、 上記吸気ポート(４)の吸気弁口(4a)と排気ポート(５)の
排気弁口(5a)との間の弁口間肉壁(６)に上記ＥＧＲ制御
弁(12)を有する排ガス還流通路(11)を形成し、上記吸気
弁口(4a)と排気弁口(5a)とを上記排ガス還流通路(11)で
連通したことを特徴とするエンジンの排ガス再循環装
置。1. An exhaust gas recirculation passage having an EGR control valve (12) for an intake port (4) and an exhaust port (5) of an engine (E).
In the exhaust gas recirculation device for an engine configured to communicate with each other at (11), between the valve ports between the intake valve port (4a) of the intake port (4) and the exhaust valve port (5a) of the exhaust port (5). An exhaust gas recirculation passage (11) having the EGR control valve (12) is formed in the meat wall (6), and the intake valve port (4a) and the exhaust valve port (5a) are connected by the exhaust gas recirculation passage (11). Exhaust gas recirculation system for engines characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6043506A JPH07253053A (en) | 1994-03-15 | 1994-03-15 | Exhaust gas recirculation device of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6043506A JPH07253053A (en) | 1994-03-15 | 1994-03-15 | Exhaust gas recirculation device of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07253053A true JPH07253053A (en) | 1995-10-03 |
Family
ID=12665623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6043506A Pending JPH07253053A (en) | 1994-03-15 | 1994-03-15 | Exhaust gas recirculation device of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07253053A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010209775A (en) * | 2009-03-10 | 2010-09-24 | Daihatsu Motor Co Ltd | Exhaust gas recirculating device for internal combustion engine |
-
1994
- 1994-03-15 JP JP6043506A patent/JPH07253053A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010209775A (en) * | 2009-03-10 | 2010-09-24 | Daihatsu Motor Co Ltd | Exhaust gas recirculating device for internal combustion engine |
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