JP2576466B2 - Stratified combustion engine - Google Patents
Stratified combustion engineInfo
- Publication number
- JP2576466B2 JP2576466B2 JP61134901A JP13490186A JP2576466B2 JP 2576466 B2 JP2576466 B2 JP 2576466B2 JP 61134901 A JP61134901 A JP 61134901A JP 13490186 A JP13490186 A JP 13490186A JP 2576466 B2 JP2576466 B2 JP 2576466B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- combustion chamber
- fuel spray
- air
- combustion
- 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
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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
- F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
- F02B23/0621—Squish flow
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
-
- 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
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、ピストンの頭部に設けられる燃焼室に燃料
噴射ノズルから燃料を噴射し、上記燃焼室に供給される
空気と上記燃料噴霧との混合気を点火栓で点火して爆発
燃焼する層状燃焼エンジンに係り、特に燃焼室構造の改
良に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention injects fuel from a fuel injection nozzle into a combustion chamber provided at the head of a piston, and supplies air supplied to the combustion chamber. The present invention relates to a stratified combustion engine that ignites a mixture of fuel and the above fuel spray with an ignition plug and performs explosive combustion, and more particularly to an improvement in a combustion chamber structure.
（従来の技術） この種層状燃焼エンジンは、いわゆる筒内燃料噴射式
火花点火エンジンとも呼ばれ、たとえば自動車等の車両
用エンジンとして用いられるものである。その構造は第
７図に示すようになっていて、頭部に燃焼室ａを備えた
ピストンｂが、図示しないシリンダの上死点の近傍にあ
るとき、噴射ノズルｃに設けられる複数の噴孔から、上
記燃焼室ａの周壁に向って複数条の燃料を放射状に噴射
する。また、上記燃焼室ａには図示しない吸気ポートか
ら燃焼用空気が供給され、この空気は燃焼室ａ内におい
てたとえば図中矢印方向の渦流（スワール）となる。こ
の空気渦流により上記燃料噴霧と空気とが混合して混合
気が生成され、燃焼室ａの外周近傍に設けた点火栓ｄで
点火する。混合気は爆発燃焼し、ピストンｂを上下駆動
するものである。すなわち上記点火栓ｄは、これに向か
って噴出される燃料噴霧および空気との混合気を点火
し、燃焼せしめる。この燃焼火炎は、空気渦流方向に隣
接する噴射された燃料噴霧と空気との混合気を点火す
る。以下、順次混合気に対する点火燃焼が、空気渦流方
向に沿って極く短時間でなされる。すなわち、はじめに
着火した燃料噴霧との混合気から、火炎伝播する燃焼が
なされる。上記燃料としては、普通、アルコールなど着
火性の低い燃料が用いられ、エンジンとしては、いわゆ
るガソリンエンジンと、ディーゼルエンジンとの中間的
な構成作用をなす。(Prior Art) This kind of stratified combustion engine is also called a so-called in-cylinder fuel injection type spark ignition engine, and is used, for example, as an engine for vehicles such as automobiles. The structure is as shown in FIG. 7. When a piston b having a combustion chamber a at its head is located near a top dead center of a cylinder (not shown), a plurality of injection holes provided in the injection nozzle c are provided. Therefore, a plurality of fuels are radially injected toward the peripheral wall of the combustion chamber a. In addition, combustion air is supplied to the combustion chamber a from an intake port (not shown), and this air is swirled in the combustion chamber a, for example, in the direction of an arrow in the figure. The air vortex mixes the fuel spray with the air to produce a mixture, which is ignited by an ignition plug d provided near the outer periphery of the combustion chamber a. The air-fuel mixture explosively burns and drives the piston b up and down. That is, the ignition plug d ignites and burns a mixture of fuel spray and air jetted toward the ignition plug d. The combustion flame ignites a mixture of the injected fuel spray and air adjacent in the direction of the air vortex. Hereinafter, the ignition combustion of the air-fuel mixture is performed in a very short time along the direction of the air vortex. That is, the combustion that propagates the flame is performed from the air-fuel mixture with the initially ignited fuel spray. As the fuel, a fuel having low ignitability such as alcohol is generally used, and the engine has an intermediate function between a so-called gasoline engine and a diesel engine.
ところで、上記燃焼室ａは平面円形状に凹陥形成され
ていて、第８図に示すように、この周壁に上記噴射ノズ
ルｃから噴出される噴霧状の燃料が衝突し、周壁に沿っ
て拡散する。周壁には何等の加工も施されておらず、か
つ円周の極く一部に燃料噴霧が衝突するのであるから、
この衝突面は略平面に近い。したがって、燃料の拡散方
向は上下左右方向ともに略均等となり、拡散範囲は比較
的小さい。噴射ノズルには複数の噴孔があり、ここから
噴出される燃料噴霧は全て同図に示すように、比較的狭
い範囲で拡散する。By the way, the combustion chamber a is formed into a concave shape in a plane circular shape, and as shown in FIG. 8, the fuel in the form of a spray ejected from the injection nozzle c collides with the peripheral wall and diffuses along the peripheral wall. . No processing is applied to the peripheral wall, and fuel spray collides with a very small part of the circumference,
This collision surface is almost flat. Therefore, the directions of diffusion of the fuel are substantially equal in the vertical and horizontal directions, and the diffusion range is relatively small. The injection nozzle has a plurality of injection holes, and all the fuel sprays injected from the injection nozzles diffuse in a relatively narrow range as shown in FIG.
このことから、燃料噴射量が少ない部分負荷時には、
燃料の拡散範囲がより小さくなって隣接する燃料噴霧相
互間の接触が起り難い。すると、燃焼した火炎が伝播せ
ず、点火栓ｄ近傍の燃料噴霧以外は未燃焼のまま排出さ
れることが多い。したがって、燃焼効率が極端に低下す
るという不具合があった。From this, at the time of partial load where the fuel injection amount is small,
As the diffusion range of the fuel becomes smaller, contact between adjacent fuel sprays hardly occurs. Then, the burned flame does not propagate, and the fuel other than the fuel spray in the vicinity of the spark plug d is often discharged without being burned. Therefore, there is a problem that the combustion efficiency is extremely reduced.
（発明が解決しようとする問題点） 本発明は、上述したような燃料噴射量が少ない部分負
荷時においても、燃料噴霧相互の接触を確実なものとし
て着火性を良好化し、よって、エンジン性能の向上を得
られる層状燃焼エンジンを提供することを目的とする。(Problems to be Solved by the Invention) The present invention improves the ignitability by ensuring the mutual contact of the fuel sprays even at the partial load where the fuel injection amount is small as described above, thereby improving the engine performance. It is an object of the present invention to provide a stratified combustion engine capable of obtaining an improvement.
（問題点を解決するための手段） すなわち本発明は、ピストンの頭部に燃焼室を凹陥形
成し、この燃焼室に燃料噴射ノズルの複数の噴孔から複
数条の燃料噴霧を放射状に噴射し、上記燃焼室に供給さ
れる燃焼室の周方向の空気渦流により混合した上記燃料
噴霧と空気との混合気を燃焼室の外周近傍に設けた点火
栓で点火して爆発燃焼するものにおいて、燃焼室周壁に
燃料噴霧の数に対応してそれぞれ周方向に沿いかつ隣接
する端部が各々接続された複数の円弧状の凹部からなる
環状の案内凹部を設け、上記案内凹部内に噴射される燃
料噴霧の衝突する燃料噴霧衝突面の噴射軸線に対する接
線角度が空気流れ方向側に90°以上の鈍角となるよう
に、各燃料噴霧の噴射軸線を上記案内凹部の空気流れ方
向の上流側に指向させたことを特徴とする層状燃焼エン
ジンである。(Means for Solving the Problems) That is, according to the present invention, a plurality of fuel sprays are radially injected from a plurality of injection holes of a fuel injection nozzle into the combustion chamber by forming a combustion chamber in the head of the piston. A combustion chamber for igniting an air-fuel mixture of the fuel spray and air mixed by an air vortex in a circumferential direction of the combustion chamber supplied to the combustion chamber with an ignition plug provided near an outer periphery of the combustion chamber to perform explosive combustion; An annular guide recess formed of a plurality of arc-shaped recesses, each of which has a circumferentially extending and adjacent end corresponding to the number of fuel sprays, is provided on the chamber peripheral wall, and the fuel injected into the guide recess is provided. The injection axis of each fuel spray is directed upstream of the guide recess in the air flow direction such that the tangent angle of the fuel spray collision surface with the spray to the injection axis is an obtuse angle of 90 ° or more toward the air flow direction. Layer characterized by having A combustion engine.
（作用） このような構成によれば、燃焼室に分散された燃料噴
霧は、燃料噴霧衝突面の噴射軸線に対する接線角度が空
気流れ方向側に90°以上の鈍角となって、かつ隣接する
凹部の両端が各々接続されているため、燃料噴霧が円弧
状の凹部に沿って良好に拡散される。さらに、その燃料
噴霧の拡散方向が空気の流れ方向に沿って案内されるた
め、燃料噴霧の拡散が促進され、隣接する燃料噴霧が確
実に接触する。(Operation) According to such a configuration, the fuel spray dispersed in the combustion chamber has an obtuse angle of 90 ° or more toward the air flow direction with respect to the injection axis of the fuel spray collision surface, and the adjacent recess. Are connected to each other, so that the fuel spray is satisfactorily diffused along the arc-shaped concave portion. Furthermore, since the diffusion direction of the fuel spray is guided along the flow direction of the air, the diffusion of the fuel spray is promoted, and the adjacent fuel sprays surely come into contact with each other.
その結果、特に部分負荷の燃料噴射量が少ない場合で
も、燃料噴霧の拡散が促進され隣接する燃料噴霧が確実
に接続されて、点火栓により着火された燃料噴霧から順
次火炎伝播して全ての燃料噴霧で燃焼が開始される。よ
って火炎伝播が途切れることなく円滑になされる。As a result, even when the fuel injection amount of the partial load is small, the diffusion of the fuel spray is promoted, the adjacent fuel sprays are reliably connected, and the flame is sequentially propagated from the fuel spray ignited by the spark plug, so that all the fuel is sprayed. Combustion is started by spraying. Therefore, flame propagation is smoothly performed without interruption.
（実施例） 以下、本発明の一実施例を図面にもとづいて説明す
る。第１図および第２図に示すように、１は頭部に後述
する燃焼室２を備えたピストンであり、このピストン１
はシリンダ３内を上下動自在に支持される。４はシリン
ダ３の開口面を閉成するシリンダヘッドであって、上記
燃焼室２の中心部に対向する位置には燃料噴射ノズル５
が設けられる。この燃料噴射ノズル５の先端部には、周
面に沿って複数の噴孔が所定間隔を存して設けられ、複
数条の燃料を放射条に噴出できるようになっている。な
お説明すれば、図中二点鎖線矢印に示すように、燃料の
噴出方向は燃焼室２の周壁に衝突するように定められ
る。一方、６は点火栓であって、これはシリンダヘッド
４の燃焼室２周壁に対向する位置に設けられる。なお、
燃焼室２には、たとえば時計廻り方向に空気渦流が生じ
るよう、図示しない渦流形成機構から燃焼用空気が供給
されるようになっている。(Example) Hereinafter, one example of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, reference numeral 1 denotes a piston provided with a combustion chamber 2 described later on its head.
Are supported so as to be able to move up and down in the cylinder 3. Reference numeral 4 denotes a cylinder head which closes an opening surface of the cylinder 3, and a fuel injection nozzle 5 is provided at a position facing the center of the combustion chamber 2.
Is provided. At the tip of the fuel injection nozzle 5, a plurality of injection holes are provided at predetermined intervals along the peripheral surface so that a plurality of fuels can be jetted to the radiation strip. In other words, as shown by a two-dot chain line arrow in the figure, the direction of fuel ejection is determined so as to collide with the peripheral wall of the combustion chamber 2. On the other hand, reference numeral 6 denotes an ignition plug, which is provided at a position facing the peripheral wall of the combustion chamber 2 of the cylinder head 4. In addition,
The combustion chamber 2 is supplied with combustion air from a vortex forming mechanism (not shown) so that an air vortex is generated in a clockwise direction, for example.
つぎに、上記燃焼室２について説明する。これはピス
トン１の頭部に凹陥形成されていて、その底面略中央部
はその周辺より上方に突出する。周壁は略垂直の断面で
あるが、その一部に周方向に沿って、かつ隣接する端部
が各々接続された複数の円弧状の凹部からなる環状の案
内凹部７が設けられる。第３図に示すように、上記案内
凹部７の位置は上記燃焼噴射ノズル５から噴出される燃
料噴霧が衝突する位置、すなわち燃料噴霧の数に対応し
た位置であり、かつその上下方向寸法は燃料噴霧を確実
に受け入れる最小限の寸法に形成される。案内凹部７は
周方向に沿い、隣接する端部が各々接続された複数の円
弧状の凹部からなる環状に形成されるところから、受け
入れた複数条の燃料噴霧はそれぞれ案内凹部７内に沿っ
て拡がるようになっている。そして第４図に示すよう
に、案内凹部７におけるそれぞれの燃料噴霧が衝突する
面である燃料噴霧衝突面7aの噴射軸線S1に対する接線S2
の角度θ（燃料衝突角度）が、空気流れ方向側に90°以
上の鈍角になるように各燃料噴霧の噴射軸線を上記案内
凹部７の空気流れ方向の上流側に指向させる必要があ
る。これは当然のことながら、燃料噴霧衝突面7aに衝突
した燃料噴霧を空気渦流の流れによって助長され燃焼用
空気との混合を良くするとともに隣接する燃料噴霧との
接触を良好ならしめるためである。90°以下の燃料衝突
角度であれば、燃料噴霧が空気渦流の流れ方向とは逆の
方向に向うことになり、90°であれば衝突した燃料噴霧
が左右略均等に拡がり、いずれにしても空気渦流が邪魔
をして隣接する燃料噴霧との接触が充分でなくなる。Next, the combustion chamber 2 will be described. This is formed as a depression in the head of the piston 1, and the substantially central portion of the bottom surface protrudes upward from its periphery. The peripheral wall has a substantially vertical cross-section, and a part thereof is provided with an annular guide concave portion 7 composed of a plurality of arc-shaped concave portions each of which is connected to an adjacent end along the circumferential direction. As shown in FIG. 3, the position of the guide recess 7 is a position where the fuel spray ejected from the combustion injection nozzle 5 collides, that is, a position corresponding to the number of fuel sprays, and its vertical dimension is It is formed to the minimum dimensions that will reliably accept the spray. Since the guide recess 7 is formed in an annular shape composed of a plurality of arc-shaped recesses whose adjacent ends are connected to each other in the circumferential direction, the plurality of fuel sprays received respectively along the guide recess 7. It is expanding. Then, as shown in FIG. 4, the tangent S 2 for the injection axis lines S 1 of the fuel spray impingement surface 7a each of the fuel spray in the guide recesses 7 is a surface for impinging
(Fuel collision angle) must be directed to the upstream side in the air flow direction of the guide recess 7 so that the injection axis of each fuel spray is directed to the air flow direction side at an obtuse angle of 90 ° or more. Naturally, this is because the fuel spray colliding with the fuel spray colliding surface 7a is promoted by the flow of the air vortex to improve the mixing with the combustion air and to improve the contact with the adjacent fuel spray. If the fuel collision angle is 90 ° or less, the fuel spray will be directed in the direction opposite to the flow direction of the air vortex, and if it is 90 °, the collided fuel spray will spread almost equally to the left and right, in any case. The air turbulence interferes with insufficient contact with the adjacent fuel spray.
しかして、第５図および第６図に示すように、このよ
うにして構成される層状燃焼エンジンの燃焼室２に、燃
料噴射ノズル５の噴孔から燃料を霧状にして噴射する。
上記噴孔は複数あるところから、燃料は複数条に分れ、
かつ放射状に噴出される。そして、この燃料噴霧は燃焼
室２の周壁に設けられる案内凹部７内に侵入し、かつ燃
料噴霧衝突面7aに衝突する。衝突面7aの衝突角度θが空
気渦流の流れ方向に鈍角に形成されているところから、
燃料噴霧は空気渦流の流れ方向に沿って円滑に進行す
る。同時に、上記燃焼室２には図中矢印方向に空気渦流
（スワール）が形成され、この空気渦流による燃焼用空
気と上記燃料噴霧が混合して混合気を生成する。ピスト
ン１が上死点近傍にあり、かつ混合気が充分圧縮される
タイミングをとって、点火栓６が点火する。上記点火栓
６は、はじめこれに向かって噴出される燃料噴霧を点火
し、燃焼せしめる。この燃焼による火炎は、空気渦流方
向に隣接する噴射された燃料噴霧と空気との混合気を点
火する。すなわち、はじめに着火した燃料噴霧から順次
火炎伝播して燃焼がなされるが、燃料噴霧は案内凹部７
内に侵入し、かつ衝突面7aに沿って進行するところか
ら、隣接する燃料噴霧と確実に接触する。したがって、
燃焼室２の周壁に亘って火炎伝播がほとんど瞬間的に行
われ、燃焼作用は確実、かつ円滑である。Then, as shown in FIGS. 5 and 6, fuel is sprayed into the combustion chamber 2 of the stratified combustion engine configured as described above from the injection hole of the fuel injection nozzle 5.
Since there are multiple injection holes, the fuel is divided into multiple lines,
And it is ejected radially. Then, the fuel spray enters the guide recess 7 provided on the peripheral wall of the combustion chamber 2 and collides with the fuel spray collision surface 7a. Since the collision angle θ of the collision surface 7a is formed at an obtuse angle in the flow direction of the air vortex,
The fuel spray proceeds smoothly along the flow direction of the air vortex. At the same time, an air swirl (swirl) is formed in the combustion chamber 2 in the direction of the arrow in the figure, and the combustion air and the fuel spray by the air swirl are mixed to generate an air-fuel mixture. The ignition plug 6 is ignited at a timing when the piston 1 is near the top dead center and the air-fuel mixture is sufficiently compressed. The ignition plug 6 first ignites and burns the fuel spray ejected toward it. The flame due to this combustion ignites a mixture of the injected fuel spray and air adjacent in the direction of the air vortex. That is, the flame is propagated sequentially from the fuel spray ignited first and combustion is performed.
From inside and proceeds along the collision surface 7a, so as to make reliable contact with the adjacent fuel spray. Therefore,
The flame spreads almost instantaneously over the peripheral wall of the combustion chamber 2, and the combustion action is reliable and smooth.
以上説明したように本発明によれば、特に部分負荷の
燃料噴射量が少ない場合でも、燃料噴霧の拡散が促進さ
れ隣接する燃料噴霧が確実に接続されて、点火栓により
着火された燃料噴霧から順次火炎伝播して全ての燃料噴
霧で燃焼が開始される。それゆえ、着火性が改善されて
燃焼効率が向上すると共に、エンジン性能が向上し、未
燃焼混合気がそのまま排出されることを未然に防止する
などの種々の効果を奏する。As described above, according to the present invention, even when the fuel injection amount of the partial load is small, the diffusion of the fuel spray is promoted, the adjacent fuel spray is securely connected, and the fuel spray ignited by the spark plug is used. Flame is sequentially propagated and combustion is started with all the fuel sprays. Therefore, the ignitability is improved, the combustion efficiency is improved, the engine performance is improved, and various effects such as preventing unburned air-fuel mixture from being discharged as they are are exhibited.
第１図ないし第６図は本発明の一実施例を示し、第１図
は層状燃焼エンジン要部の平面図、第２図はその縦断面
図、第３図はピストンの一部切欠した斜視図、第４図は
要部を拡大した図、第５図はピストンの横断平面図、第
６図は案内凹部の展開図、第７図および第８図は本発明
の従来例を示し、第７図は層状燃焼エンジン要部の平面
図、第８図はピストンの一部切欠した斜視図である。 １……ピストン、２……燃焼室、５……燃料噴射ノズ
ル、６……点火栓、７……案内凹部、7a……燃料噴霧衝
突面。1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of a main part of a stratified combustion engine, FIG. 2 is a longitudinal sectional view thereof, and FIG. FIG. 4 is an enlarged view of a main part, FIG. 5 is a cross-sectional plan view of a piston, FIG. 6 is a developed view of a guide recess, FIGS. 7 and 8 show a conventional example of the present invention. FIG. 7 is a plan view of a main part of the stratified combustion engine, and FIG. 8 is a perspective view of a piston with a part cut away. 1 ... piston, 2 ... combustion chamber, 5 ... fuel injection nozzle, 6 ... spark plug, 7 ... guide recess, 7a ... fuel spray collision surface.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−106024（ＪＰ，Ａ) 特開 昭47−32204（ＪＰ，Ａ) 特開 昭50−116807（ＪＰ，Ａ) 実開 昭57−193024（ＪＰ，Ｕ) 実開 昭58−178419（ＪＰ，Ｕ) 特公 昭46−11681（ＪＰ，Ｂ１) 特公 昭49−16881（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-106024 (JP, A) JP-A-47-32204 (JP, A) JP-A 50-116807 (JP, A) 193024 (JP, U) Japanese Utility Model Showa 58-178419 (JP, U) JP-B 46-11681 (JP, B1) JP-B 49-16881 (JP, B2)
Claims (1)
燃料噴射ノズルの複数の噴孔から複数条の燃料噴霧を放
射状に噴射し、上記燃焼室に供給される燃焼室の周方向
の空気渦流により混合した上記燃料噴霧と空気との混合
気を燃焼室の外周近傍に設けた点火栓で点火して爆発燃
焼するものにおいて、 燃焼室周壁に燃料噴霧の数に対応してそれぞれ周方向に
沿いかつ隣接する端部が各々接続された複数の円弧状の
凹部からなる環状の案内凹部を設け、上記案内凹部内に
噴射される燃料噴霧の衝突する燃料噴霧衝突面の噴射軸
線に対する接線角度が空気流れ方向側に90°以上の鈍角
となるように、各燃料噴霧の噴射軸線を上記案内凹部の
空気流れ方向の上流側に指向させたことを特徴とする層
状燃焼エンジン。1. A combustion chamber, which is recessed at the top of a piston,
A plurality of fuel sprays are radially injected from a plurality of injection holes of a fuel injection nozzle, and a mixture of the fuel spray and air mixed by a circumferential air vortex of the combustion chamber supplied to the combustion chamber is mixed with the combustion chamber. A plurality of arc-shaped combustion chambers ignited by an ignition plug provided in the vicinity of the outer periphery of the combustion chamber, and each of which is connected to the peripheral wall of the combustion chamber along the circumferential direction and adjacent ends corresponding to the number of fuel sprays. An annular guide recess formed of a recess is provided so that a tangent angle of a fuel spray collision surface against which fuel spray injected into the guide recess collides with an injection axis becomes an obtuse angle of 90 ° or more toward the air flow direction. A stratified combustion engine characterized in that the injection axis of the fuel spray is directed upstream of the guide recess in the air flow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61134901A JP2576466B2 (en) | 1986-06-12 | 1986-06-12 | Stratified combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61134901A JP2576466B2 (en) | 1986-06-12 | 1986-06-12 | Stratified combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62291424A JPS62291424A (en) | 1987-12-18 |
| JP2576466B2 true JP2576466B2 (en) | 1997-01-29 |
Family
ID=15139168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61134901A Expired - Lifetime JP2576466B2 (en) | 1986-06-12 | 1986-06-12 | Stratified combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2576466B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01131823U (en) * | 1988-03-02 | 1989-09-07 | ||
| WO2001012966A1 (en) * | 1999-08-13 | 2001-02-22 | Yanmar Diesel Engine Co., Ltd. | Combustion chamber of direct injection diesel engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56106024A (en) * | 1980-01-26 | 1981-08-24 | Hino Motors Ltd | Combustion chamber for direct-injection type diesel engine |
| JPS57193024U (en) * | 1981-05-28 | 1982-12-07 | ||
| JPS58178419U (en) * | 1982-05-26 | 1983-11-29 | 株式会社小松製作所 | Diesel engine spark assist device |
-
1986
- 1986-06-12 JP JP61134901A patent/JP2576466B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62291424A (en) | 1987-12-18 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |