JPS5853629A - Construction of combustion chamber in engine - Google Patents
Construction of combustion chamber in engineInfo
- Publication number
- JPS5853629A JPS5853629A JP15263581A JP15263581A JPS5853629A JP S5853629 A JPS5853629 A JP S5853629A JP 15263581 A JP15263581 A JP 15263581A JP 15263581 A JP15263581 A JP 15263581A JP S5853629 A JPS5853629 A JP S5853629A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- plasma
- combustion
- insulating material
- heat insulating
- 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
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/11—Thermal or acoustic insulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は、エンジンの燃焼室構造に関するものである。[Detailed description of the invention] The present invention relates to a combustion chamber structure of an engine.
従来、燃焼室の熱効率を高めるために、エンジンの燃焼
室を断熱材で被覆した構造のものが、実開昭５２−１５
８２０３号公報で提案されている。Conventionally, in order to increase the thermal efficiency of the combustion chamber, the combustion chamber of the engine was covered with a heat insulating material.
This is proposed in Publication No. 8203.
確かに、かかる燃焼室ＩＣおいては熱効率が向上し燃焼
温度も高くなり実用上好ましいものであるが、未だ実用
化されていない。It is true that such a combustion chamber IC has improved thermal efficiency and a higher combustion temperature, which is preferable for practical use, but it has not yet been put into practical use.
これは、点火栓が通常の火花点火方式のものであると、
火炎伝播が遅いため、燃焼室の高８化により燃焼室に付
着したカーボン等が発火源となり、正常燃焼過程におい
て、混合気の未燃焼部分に自己点火が起り、ノッキング
等の異常燃焼が生じるため実用化されていないものと考
えられる。This means that if the spark plug is a regular spark ignition type,
Because flame propagation is slow, carbon, etc. that adhere to the combustion chamber due to the height 8 of the combustion chamber becomes an ignition source, and during the normal combustion process, self-ignition occurs in the unburned part of the air-fuel mixture, causing abnormal combustion such as knocking. It is thought that it has not been put into practical use.
本発明者らは、この断熱材で被覆された燃焼室の不具合
を解決するために種々検討の結果、点火栓を周知のプラ
ズマ点火栓とすれば、この点火栓においては火炎伝播が
早く燃焼速度が速いため前記のようにノッキング等の異
常燃焼が生じないということを見出した。The inventors of the present invention have conducted various studies to solve the problems of combustion chambers covered with heat insulating materials, and have found that if the ignition plug is a well-known plasma ignition plug, the flame propagation will be faster and the combustion speed will be faster. It was discovered that because the combustion speed is fast, abnormal combustion such as knocking does not occur as described above.
本発明は、前記の知見にもとずいてなされたもので、断
熱材で被覆された燃焼室と、該燃焼室に臨設され、正負
両極間の点火間隙の周囲を電気絶縁材で包囲して形成さ
れる放電空間を有して該放電空間に発生するプラズマ状
ガスを噴孔から前記燃焼室に噴出するプラズマ点火栓と
を備えて前記不具合を除去したエンジンの燃焼室構造を
提供することを目的とする。The present invention has been made based on the above-mentioned knowledge, and includes a combustion chamber covered with a heat insulating material, and an electric insulating material installed in the combustion chamber and surrounding the ignition gap between the positive and negative poles. It is an object of the present invention to provide a combustion chamber structure for an engine which eliminates the above-mentioned disadvantages by having a plasma spark plug that has a discharge space formed therein and injects plasma-like gas generated in the discharge space from a nozzle hole into the combustion chamber. purpose.
つぎに、本発明を一実施例である図面にしたが。、って
説明する。Next, the present invention is illustrated in a drawing which is an embodiment of the present invention. , explains.
図において、１はピストン２をシ１７ンタ′３内で往復
運動させて回転出力を得るよう（どしたレシプロエンジ
ンの気筒、４は燃焼室５の上部を画成するシリンダヘッ
ドである。６．７は前記ピストン２の上端面およびシリ
ンダヘッド４の内面１ど設Ｃすた断熱材、８は先喘を燃
焼室５に臨ませてシリンダヘッド４に螺合固定したプラ
ズマ点火栓である。In the figure, 1 is a cylinder of a reciprocating engine that reciprocates a piston 2 in a cylinder '3 to obtain rotational output, and 4 is a cylinder head that defines the upper part of a combustion chamber 5.6. 7 is a heat insulating material provided on the upper end surface of the piston 2 and the inner surface of the cylinder head 4; 8 is a plasma ignition plug screwed and fixed to the cylinder head 4 with its leading end facing the combustion chamber 5;
このプラズマ点火栓８は、周知のもので、中）０１電極
９と外周にねじを切った側方電極１０とをセラミック等
の電気絶縁材１１で仕切って内部に放雷空間１２を形成
し、両電極９．１０間番こ最初高電圧を印加して放電空
間１２の絶縁破壊を行なったのち、両電極９．１０間に
低電圧を印加してプラズマガスを噴孔１３から燃焼室５
内番と噴出させるようになっている。This plasma ignition plug 8 is well-known, and has a middle electrode 9 and a side electrode 10 having a thread cut on the outer periphery separated by an electrical insulating material 11 such as ceramic to form a lightning discharge space 12 inside. First, a high voltage is applied between both electrodes 9 and 10 to cause dielectric breakdown of the discharge space 12, and then a low voltage is applied between both electrodes 9 and 10 to direct plasma gas from the nozzle hole 13 to the combustion chamber 5.
It is made to squirt with the inner number.
１４は火花放電エネルギーを前記プラズマ、截火栓８に
供給する高電圧発生回路、１８（まプラズマ火花エネル
ギーをプラズマ点火栓旧こ供給する低電圧発生回路であ
る。そして、前記高電圧発生回路１４は、従来の火花点
火装置同様、電源であるバッテリＥに直列接続されたキ
ースイッチＳＷ。14 is a high voltage generation circuit that supplies spark discharge energy to the plasma and the ignition plug 8; 18 is a low voltage generation circuit that supplies plasma spark energy to the plasma ignition plug 8; Similarly to the conventional spark ignition device, a key switch SW is connected in series to a battery E which is a power source.
−次コイル１５ａおよび二次コイル１５ｂからなる点火
コイル１５、及びブレーカポイント１６から構成されて
、二次コイル１５ｂの一端はダイオードＤ１を介してデ
ィストリビュータ１７により各気筒のプラズマ点火栓８
に接続されている。一方、低電圧発生回路１８は前記電
源Ｅまたはそれとは別の独立した電源に接続され、田源
甫圧を３ＫＶ程麿にまで昇圧するＤＣ／ＤＣＣ／式−タ
１９と、それに並列接続された抵抗Ｒおよびコンデンサ
Ｃにより構成され、ダイオードＤ２〜Ｄ５を介して各プ
ラズマ点火栓８に接続されている。- Consisting of an ignition coil 15 consisting of a primary coil 15a and a secondary coil 15b, and a breaker point 16, one end of the secondary coil 15b is connected to the plasma ignition plug 8 of each cylinder by a distributor 17 via a diode D1.
It is connected to the. On the other hand, the low voltage generation circuit 18 is connected to the power supply E or another independent power supply, and includes a DC/DCC/type generator 19 that boosts the Tagenho pressure up to about 3KV, and a resistor connected in parallel thereto. R and a capacitor C, and is connected to each plasma ignition plug 8 via diodes D2 to D5.
したがって、まず、高電圧発生回路１４からディストリ
ビュータ１７を介して５ＱＫＶ程度の高電圧がプラズマ
点火栓８の中心電極９と側方電極１０との間に印加され
て火花を生じさせ、ついで、両電極９．１０間に印加さ
れている低電圧発生回路１８からの低電圧により、前記
火花によって絶縁破壊された放電空間１２内に放電状態
を持続させ、それによって放電空間１２内に生じる高温
高子のプラズマ状ガスを噴孔１３から燃焼室５内に噴出
させて、燃焼室５内の混合気を着火して急速に燃焼させ
ることになる。この結果、燃焼速度の早いプラズマ点火
を行うことによって断熱材を形成した燃焼室においても
、ノッキング等の異常燃焼の発生を防止することができ
、断熱材を形成することによるメリットを最大限利用す
ることが可能となる。つまり、燃焼温度が高くなること
からエンジンの燃焼効率が向上し、また排気系に過給用
のタービンを介設するものにおいては、排気ガス温度が
高くなるため、タービンの回転力が向上し、より過給効
率が向上する。Therefore, first, a high voltage of about 5QKV is applied from the high voltage generation circuit 14 via the distributor 17 between the center electrode 9 and the side electrodes 10 of the plasma ignition plug 8 to generate a spark, and then both electrodes The low voltage from the low voltage generation circuit 18 applied during 9.10 maintains the discharge state in the discharge space 12 dielectrically broken down by the spark, thereby causing high temperature polymers generated in the discharge space 12. Plasma-like gas is ejected from the nozzle hole 13 into the combustion chamber 5, and the air-fuel mixture within the combustion chamber 5 is ignited and rapidly combusted. As a result, it is possible to prevent abnormal combustion such as knocking even in a combustion chamber where a heat insulating material is formed by performing plasma ignition with a high combustion speed, and to maximize the benefits of forming a heat insulating material. becomes possible. In other words, the engine's combustion efficiency improves due to the higher combustion temperature, and in those with a supercharging turbine installed in the exhaust system, the exhaust gas temperature increases, which improves the rotational force of the turbine. Supercharging efficiency is further improved.
以上のことから明らかなように、本発明によれば、燃焼
室を断熱材で覆うことにより燃焼室の熱効率を高める一
方、点火栓を燃焼速度の速いプラズマ点火栓とすること
により、付着カーボン等による自己点火を防止し、ノッ
クキング等の異常燃焼の発生を未然に阻止するエンジン
の燃焼室構造の実現を可能ならしめることに成功したも
のである。As is clear from the above, according to the present invention, the thermal efficiency of the combustion chamber is increased by covering the combustion chamber with a heat insulating material, and the ignition plug is a plasma ignition plug with a high combustion speed, thereby reducing the amount of deposited carbon. This work has succeeded in creating a combustion chamber structure for an engine that prevents self-ignition caused by combustion and prevents the occurrence of abnormal combustion such as knocking.
小１図は本発明にかかるエンジンの燃焼室構造を示す構
成図である。
ｌ・・・気筒、５・・・燃焼室、６．７・・・断熱材、
８・・・プラズマ点火栓、９・・・中心電極、１０・・
・側方電極、１２・・・放電空間、１３・・・噴孔、１
４・・・高電圧発生回路、１８・・・低電圧発生回路。FIG. 1 is a configuration diagram showing the structure of a combustion chamber of an engine according to the present invention. l...Cylinder, 5...Combustion chamber, 6.7...Insulating material,
8... Plasma spark plug, 9... Center electrode, 10...
・Side electrode, 12...Discharge space, 13...Nozzle hole, 1
4...High voltage generation circuit, 18...Low voltage generation circuit.
Claims (1)
れ、正負両極間の点火間隙の周囲を電気絶縁材で包囲し
て形成される放電空間を有して該放電空間に発生するプ
ラズマ状ガスを噴孔から前記燃焼室に噴出するプラズマ
点火栓と、を備えたことを特徴とするエンジンの燃焼室
構造。(1) A combustion chamber covered with a heat insulating material, and a discharge space provided in the combustion chamber and formed by surrounding the ignition gap between the positive and negative poles with an electrical insulating material, and the discharge generated in the space. A combustion chamber structure for an engine, comprising: a plasma ignition plug that injects plasma-like gas from a nozzle hole into the combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15263581A JPS5853629A (en) | 1981-09-26 | 1981-09-26 | Construction of combustion chamber in engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15263581A JPS5853629A (en) | 1981-09-26 | 1981-09-26 | Construction of combustion chamber in engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5853629A true JPS5853629A (en) | 1983-03-30 |
Family
ID=15544699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15263581A Pending JPS5853629A (en) | 1981-09-26 | 1981-09-26 | Construction of combustion chamber in engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5853629A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60171797U (en) * | 1984-04-24 | 1985-11-14 | 三菱重工業株式会社 | Small and large container carrier |
| US4864987A (en) * | 1987-12-14 | 1989-09-12 | Isuzu Motors Limited | Heat insulating engine |
-
1981
- 1981-09-26 JP JP15263581A patent/JPS5853629A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60171797U (en) * | 1984-04-24 | 1985-11-14 | 三菱重工業株式会社 | Small and large container carrier |
| US4864987A (en) * | 1987-12-14 | 1989-09-12 | Isuzu Motors Limited | Heat insulating engine |
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