JP2721685B2 - Spark ignition gas engine - Google Patents
Spark ignition gas engineInfo
- Publication number
- JP2721685B2 JP2721685B2 JP63306098A JP30609888A JP2721685B2 JP 2721685 B2 JP2721685 B2 JP 2721685B2 JP 63306098 A JP63306098 A JP 63306098A JP 30609888 A JP30609888 A JP 30609888A JP 2721685 B2 JP2721685 B2 JP 2721685B2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- injection hole
- spark ignition
- torch
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、火花点火ガスエンジンの副室形状によるト
ーチ形成法に関するもので、ガソリンエンジン又は予混
合のアルコールエンジン等予混合、火花点火エンジン全
般に適用することができる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a torch using a sub chamber shape of a spark ignition gas engine, and more particularly to a premixed, spark ignition engine such as a gasoline engine or a premixed alcohol engine. Can be applied to
第６図，第７図に示すように、副室06内へ点火しやす
い混合比のガス燃料をトーチ用ガス燃料導管07から導入
し、副室06内部に設置された点火プラグ09により点火
し、副室噴孔08から噴出する火炎により主室内01にトー
チを形成し、給気管04から導入された、大部分の通常は
点火しにくい希薄なガス燃料に点火し、安定な火炎伝播
を得る。As shown in FIGS. 6 and 7, gas fuel having a mixture ratio that facilitates ignition is introduced into the sub-chamber 06 from the gas fuel conduit 07 for the torch, and is ignited by the ignition plug 09 installed in the sub-chamber 06. , A torch is formed in the main chamber 01 by the flame spouted from the sub chamber injection hole 08, and most of the normally difficult to ignite lean gas fuel introduced from the air supply pipe 04 is ignited to obtain stable flame propagation. .
このようにして、混合比をより希薄にして、安定に燃
焼させることができると、NOXを低減できる。In this way, if the mixture ratio can be made leaner and stable combustion can be performed, NO X can be reduced.
従来の副室付トーチ点火ガスエンジンでは、第６図，
第７図に示すように、副室噴孔08がシリンダヘツドのほ
ぼ中央にある副室中心に対称に形成されているため、圧
縮時に副室06内にガス燃料の混合気の縦旋回流が形成さ
れない、従って、点火プラグ09まわりから火炎が拡が
り、最初に、副室噴孔08から、副室内の未燃ガスが噴出
し、ついで火炎が噴出するので、強力なトーチを形成す
ることができない。In the conventional torch ignition gas engine with sub chamber, FIG.
As shown in FIG. 7, since the sub chamber injection hole 08 is formed symmetrically at the center of the sub chamber located substantially at the center of the cylinder head, the vertical swirling flow of the gas-fuel mixture in the sub chamber 06 during compression. It is not formed, so that the flame spreads around the spark plug 09, and first, the unburned gas in the sub-chamber is blown out from the sub-chamber injection hole 08, and then the flame is blown out, so that a strong torch cannot be formed. .
従って給気管から主室内へ供給された大部分の混合気
に効率良く、点火することができない。Therefore, most of the air-fuel mixture supplied from the air supply pipe into the main chamber cannot be efficiently ignited.
NOXを低減するには、主室内の混合気をできるだけ希
薄にすることが必要であるが、トーチの形成が十分でな
いと十分に希薄にできず、NOXを十分に低減できない。In order to reduce NO X , it is necessary to make the mixture in the main chamber as lean as possible. However, if the formation of the torch is not sufficient, the mixture cannot be made sufficiently lean and NO X cannot be reduced sufficiently.
そこで、できるだけ副室からの未燃ガスの噴出を抑
え、早く火炎を主室へ噴出させ、十分に強いトーチを形
成させる必要がある。Therefore, it is necessary to suppress the ejection of unburned gas from the sub-chamber as much as possible, to eject the flame to the main chamber as soon as possible, and to form a sufficiently strong torch.
シリンダ中心のほぼ中央に設けられた主室内の燃料ガ
スのトーチ点火用の副室噴孔を、副室中心軸に対して、
噴孔と中心軸を含む断面内で噴孔方向角度を同一に保っ
て噴孔径を非対称とする。The sub chamber injection hole for torch ignition of the fuel gas in the main chamber provided substantially at the center of the cylinder center, with respect to the sub chamber center axis,
The diameter of the injection hole is made asymmetric by maintaining the same injection direction angle in the cross section including the injection hole and the central axis.
副室噴孔をシリンダヘツドのほぼ中央にある副室中心
軸線に対して非対称としているため、圧縮時に噴孔から
副室内に流れ込むガス燃料の混合気が副室内に縦旋回流
を形成する。そのため点火プラグにより点火されたガム
燃料の混合気の火炎が旋回流に乗って比較的早く主室に
噴出し、主室内に効率的に強力なトーチを形成する。Since the sub-chamber injection hole is asymmetrical with respect to the sub-chamber center axis substantially at the center of the cylinder head, the gaseous fuel mixture flowing into the sub-chamber from the injection hole during compression forms a vertical swirling flow in the sub-chamber. Therefore, the flame of the mixture of the gum fuel ignited by the spark plug jets into the main chamber relatively quickly along the swirling flow and efficiently forms a strong torch in the main chamber.
第１図，第２図において、１はシリンダヘツド、２は
シリンダライナ、３はピストン、４は給気ポート、５は
給気弁、６はトーチジエツト用副室、７はトーチ形成用
ガス燃料導管、8,8′は非対称位置に配置された副室噴
孔、6aは圧縮時に生じる副室内縦旋回流、９は点火プラ
グ、ｃは副室の中心軸線である。1 and 2, 1 is a cylinder head, 2 is a cylinder liner, 3 is a piston, 4 is an air supply port, 5 is an air supply valve, 6 is a sub chamber for a torch jet, and 7 is a gas fuel conduit for forming a torch. , 8, 8 'are sub-chamber injection holes arranged at asymmetric positions, 6a is a vertical swirling flow generated in the sub-chamber, 9 is a spark plug, and c is a central axis of the sub-chamber.
副室６の噴孔８が例えば、４孔ある場合に、副室６の
中心軸線ｃを含む面ｐの一方側（図では右側）に２つの
噴孔８′を寄せて形成する。For example, when there are four injection holes 8 in the sub-chamber 6, two injection holes 8 'are formed on one side (the right side in the drawing) of the plane p including the central axis c of the sub-chamber 6.
このような装置において、シリンダヘツド１とシリン
ダライナ２とピストン３とで形成される主燃焼室へ、給
気ポート４、給気弁５を通して、混合比の希薄な大部分
のガス燃料を導入し、点火しやすい混合比の少量のガス
燃料（全量の３〜５％程度）を導管７を通じて小さな容
積の副室６（圧縮時の全燃焼室容積の３〜５％程度）へ
導入する。吸収が終了し圧縮を開始すると、副室６の噴
孔８からガスの流入が始まる。In such an apparatus, most of the gaseous fuel having a low mixing ratio is introduced into the main combustion chamber formed by the cylinder head 1, the cylinder liner 2, and the piston 3 through the air supply port 4 and the air supply valve 5. A small amount of gaseous fuel (approximately 3 to 5% of the total amount) is introduced into the small-volume sub-chamber 6 (approximately 3 to 5% of the total combustion chamber volume during compression) through a conduit 7 with a mixture ratio that facilitates ignition. When the absorption is completed and the compression is started, the flow of gas starts from the injection hole 8 of the sub chamber 6.
この時、副室噴孔8,8′は、第２図に示すように、副
室の中心線ｃに対して、非対称に配列されているので、
縦旋回流6aを形成する。At this time, as shown in FIG. 2, the sub chamber injection holes 8, 8 'are arranged asymmetrically with respect to the center line c of the sub chamber.
A vertical swirling flow 6a is formed.
従来の副室では、縦旋回流が生じないため、点火栓９
によって点火された混合気は、第８図の如く、点火栓９
の近くから順次火炎が伝播し、点火直後には、未燃の副
室内のガス燃料の混合気が副室噴孔08から噴出するのみ
であるのに対して、本発明によれば、第５図の如く、副
室内に生じる渦流（縦の旋回流）により、点火後の火炎
が旋回流に乗りすみやかに噴孔近くへ伝播するので、未
燃のガス燃料の噴出が少なく、主室内へ、強力な火炎の
トーチジエツトを形成することができる。In the conventional sub-chamber, since no vertical swirling flow occurs, the ignition plug 9
The air-fuel mixture ignited by the spark plug 9 as shown in FIG.
In contrast to the above, the flame propagates sequentially from near, and immediately after the ignition, the gas-fuel mixture in the unburned sub-chamber only gushes from the sub-chamber injection hole 08. As shown in the figure, the swirling flow (vertical swirling flow) generated in the sub-chamber causes the flame after ignition to propagate immediately to the vicinity of the injection hole by riding the swirling flow. Can form a powerful flame torch jet.
なお本発明は、副室の中心軸線に対して噴孔の位置の
みでなく、噴孔の数（配置）あるいは面積（噴孔径）が
非対称の場合も同じ効果がある。The present invention has the same effect when the number (arrangement) or area (diameter of injection holes) of the injection holes is not asymmetric with respect to the position of the injection holes with respect to the center axis of the sub chamber.
その場合の副室噴孔の断面の図を第３図，第４図に示
す。FIGS. 3 and 4 show cross-sectional views of the sub chamber injection holes in that case.
第３図は、噴孔8a,8bの数（配置）が副室中心軸線に
対して非対称の場合を示し、第４図は、噴孔8aが他の噴
孔8dより孔径が大きく形成され、噴孔自体は全部放射状
に配されている場合を示す。FIG. 3 shows a case where the number (arrangement) of the injection holes 8a and 8b is asymmetric with respect to the center axis of the sub chamber, and FIG. 4 shows that the injection hole 8a has a larger diameter than the other injection holes 8d. The case where the injection holes themselves are all arranged radially is shown.
本発明による火花点火ガスエンジンは、シリンダヘツ
ドのほぼ中央に副室を持ち、その内部へ点火しやすい混
合比のガス燃料を導き点火プラグによっ点火し副室噴孔
より、主室内へトーチを形成する火花点火エンジンにお
いて、圧縮時に前記副室内に縦旋回流が生じるように副
室噴孔を、副室中心軸に対して噴孔と中心軸を含む断面
内で噴孔方向角度を同一に保って噴孔径を非対称にした
ことにより次の効果を生ずる。The spark ignition gas engine according to the present invention has a sub-chamber substantially at the center of the cylinder head, guides gas fuel having a mixture ratio that is easy to ignite into the sub-chamber, ignites with a spark plug, and forms a torch into the main chamber from the sub-chamber injection hole. In the spark ignition engine to be formed, the sub-chamber injection hole is made to have the same injection hole direction angle in a cross section including the injection hole and the central axis with respect to the sub-chamber central axis so that a vertical swirling flow is generated in the sub-chamber during compression. The following effects are produced by making the injection hole diameter asymmetrical while maintaining the same.
副室内に縦旋回流を形成することにより、副室内で点
火された火災が旋回流に乗って点火後、早期に副室噴孔
部へ運ばれ、主室内へ火災を噴出させ、効率的にしかも
強力なトーチを形成することができる。By forming a vertical swirling flow in the sub-chamber, the fire ignited in the sub-chamber rides on the swirling flow and is swiftly carried to the sub-chamber orifice, causing the fire to squirt into the main room and efficiently. Moreover, a strong torch can be formed.
従って、給気管から導入するガスの混合比を非常に希
薄にしても安定に点火、確実な火災伝播を確保でき、NO
Xの生成を低レベルに抑えることができる。Therefore, stable ignition and reliable fire propagation can be ensured even if the mixture ratio of the gas introduced from the intake pipe is extremely lean, and NO
X generation can be kept to a low level.
第１図は本発明火花点火ガスエンジンの実施例における
燃焼室まわりの縦断面図、第２図は第１図の副室噴孔断
面、第３図は本発明の他の実施例における副室噴孔断面
図、第４図は本発明の更に他の実施例における副室噴孔
断面図。第５図は本発明による火花点火ガスエンジンの
副室内の火災伝播状況を示す。第６図は従来の火花点火
ガスエンジンにおける燃焼室まわりの縦断面図、第７図
は第６図の副室噴孔断面図、第８図は従来の火花点火ガ
スエンジンの副室内の火災伝播状況を示す。 １……シリンダヘツド、２……シリンダライナ ３……ピストン、６……副室 8,8′……副室噴孔FIG. 1 is a longitudinal sectional view around a combustion chamber in an embodiment of a spark ignition gas engine of the present invention, FIG. 2 is a sectional view of a sub-chamber injection hole in FIG. 1, and FIG. 3 is a sub-chamber in another embodiment of the present invention. FIG. 4 is a sectional view of a sub-chamber injection hole in still another embodiment of the present invention. FIG. 5 shows a fire propagation situation in the sub-chamber of the spark ignition gas engine according to the present invention. 6 is a longitudinal sectional view around a combustion chamber in a conventional spark ignition gas engine, FIG. 7 is a sectional view of a sub-chamber injection hole in FIG. 6, and FIG. 8 is a fire propagation in a sub-chamber of a conventional spark ignition gas engine. Indicates the situation. 1 ... Cylinder head, 2 ... Cylinder liner 3 ... Piston, 6 ... Sub chamber 8,8 '... Sub chamber injection hole
フロントページの続き (56)参考文献 特開 昭63−162922（ＪＰ，Ａ) 実開 平２−67030（ＪＰ，Ｕ) 特公 昭60−5766（ＪＰ，Ｂ２) 実公 昭31−3803（ＪＰ，Ｙ１)Continuation of the front page (56) References JP-A-63-162922 (JP, A) JP-A-2-67030 (JP, U) JP-B-60-5766 (JP, B2) JP-B-31-3803 (JP) , Y1)
Claims (1)
その内部へ点火しやすい混合比のガス燃料を導き点火プ
ラグによって点火し副室噴孔より、主室内へトーチを形
成する火花点火エンジンにおいて、圧縮時に前記副室内
に縦旋回流が生じるように副室噴孔を副室中心軸に対し
て、噴孔と中心軸を含む断面内で噴孔方向角度を同一に
保って噴孔径を非対称にしたことを特徴とする火花点火
ガスエンジン。A subchamber is provided substantially at the center of a cylinder head.
In a spark ignition engine in which a gas fuel having a mixture ratio that is easy to ignite is introduced and ignited by a spark plug to form a torch into the main chamber from a sub chamber injection hole, a sub-chamber is formed so that a vertical swirling flow is generated in the sub chamber during compression. A spark ignition gas engine characterized in that a diameter of an injection hole is made asymmetric by keeping an angle of an injection hole direction in a cross section including an injection hole and a central axis of a chamber injection hole with respect to a center axis of a sub chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63306098A JP2721685B2 (en) | 1988-12-05 | 1988-12-05 | Spark ignition gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63306098A JP2721685B2 (en) | 1988-12-05 | 1988-12-05 | Spark ignition gas engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02153221A JPH02153221A (en) | 1990-06-12 |
| JP2721685B2 true JP2721685B2 (en) | 1998-03-04 |
Family
ID=17953013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63306098A Expired - Lifetime JP2721685B2 (en) | 1988-12-05 | 1988-12-05 | Spark ignition gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721685B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001227344A (en) * | 2000-02-14 | 2001-08-24 | Mitsubishi Heavy Ind Ltd | Nozzle hole structure of torch ignition-type gas engine |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020031119A (en) * | 2002-02-21 | 2002-04-26 | 정성식 | Inducing self-ignition device and its method for spark ignition in an internal combustion engine |
| JP4147403B2 (en) * | 2003-07-31 | 2008-09-10 | マックス株式会社 | Combustion chamber structure of gas-fired impact tool |
| JP6076662B2 (en) | 2012-09-20 | 2017-02-08 | 三菱重工業株式会社 | Sub-chamber gas engine |
| JP6796471B2 (en) * | 2016-12-08 | 2020-12-09 | 三菱重工エンジン＆ターボチャージャ株式会社 | Sub-chamber gas engine |
| JP6562019B2 (en) | 2017-03-16 | 2019-08-21 | トヨタ自動車株式会社 | Internal combustion engine |
| DE102020001385A1 (en) | 2020-03-04 | 2021-09-09 | Daimler Ag | Pre-chamber spark plug for a combustion chamber of an internal combustion engine, internal combustion engine and motor vehicle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605766A (en) * | 1983-06-21 | 1985-01-12 | Matsushita Electric Ind Co Ltd | Flat type dc motor |
| JPH07116991B2 (en) * | 1986-12-24 | 1995-12-18 | ヤンマーディーゼル株式会社 | Subchamber type gas chamber subchamber structure |
-
1988
- 1988-12-05 JP JP63306098A patent/JP2721685B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001227344A (en) * | 2000-02-14 | 2001-08-24 | Mitsubishi Heavy Ind Ltd | Nozzle hole structure of torch ignition-type gas engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02153221A (en) | 1990-06-12 |
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