JPS63179123A - Internal combustion engine - Google Patents

Internal combustion engine

Info

Publication number
JPS63179123A
JPS63179123A JP62011809A JP1180987A JPS63179123A JP S63179123 A JPS63179123 A JP S63179123A JP 62011809 A JP62011809 A JP 62011809A JP 1180987 A JP1180987 A JP 1180987A JP S63179123 A JPS63179123 A JP S63179123A
Authority
JP
Japan
Prior art keywords
combustion chamber
chamber
fuel
ignition
injection nozzle
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
Application number
JP62011809A
Other languages
Japanese (ja)
Inventor
Katsuhiko Nagakura
克彦 永倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
Priority to JP62011809A priority Critical patent/JPS63179123A/en
Publication of JPS63179123A publication Critical patent/JPS63179123A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/08Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
    • F02B23/10Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
    • F02B23/101Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on or close to the cylinder centre axis, e.g. with mixture formation using spray guided concepts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/12Other methods of operation
    • F02B2075/125Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/24Cylinder heads
    • F02F2001/244Arrangement of valve stems in cylinder heads
    • F02F2001/247Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

PURPOSE:To increase mixture gas formation speed and to improve the combustion efficiency, by projecting a base portion having a collision face from the bottom face of a combustion chamber formed by recessing a piston head, and diffusing fuel being ejected into the combustion chamber radially outward. CONSTITUTION:Injection nozzle 24 of a fuel injection valve 23 and a spark electrode section 27 of an ignition plug 28 are arranged while facing with an ignition chamber 22 provided in a cylinder head 17. In such arrangement, a piston head 18 of a piston 16 inserted slidably into a cylinder 15 facing with a cylinder head 17 is recessed to a combustion chamber 19. A base portion 21 having a collision face 25 is projected upward from the bottom face 20 of the combustion chamber 19 so that fuel injected from the injection nozzle 24 through the ignition chamber 22 into the combustion chamber 19 is diffused radially outward. Consequently, mixture gas forming speed is increased resulting in the improvement of combustion efficiency.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、燃料噴射弁の噴射ノズルと点火プラグのス
パーク電極部とをシリンダヘッドに設けた点火室に臨ん
で配設して、燃焼室における燃料と空気との混合気を、
上記の点火室において発生した火炎ジェットによって着
火するようにした内燃機関に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides an arrangement in which an injection nozzle of a fuel injector and a spark electrode part of a spark plug are disposed facing an ignition chamber provided in a cylinder head, thereby disposing fuel in a combustion chamber. and air mixture,
This invention relates to an internal combustion engine that is ignited by a flame jet generated in the ignition chamber.

従来の技術 この種の内燃機関としては、例えば第5図に示すような
ものがある。このものでは、シリンダ(1)へ上下摺動
自在に内挿したピストン(2)に、シリンダヘッド(3
)に対面したピストンヘッド(4)を窪ませた燃焼室(
5)を設ける一方、その一端側が上記の燃焼室(5)へ
臨んで開口する直筒状の点火室(6)を前記のシリンダ
ヘッド(3)に設けて、その点火室(6)の奥に燃料噴
射弁(7)の噴射ノズル(8)を配置している。この噴
射ノズル(8)は、前記のピストン(5)が上死点付近
へ来たときに、前記燃焼室(5)の平底状をした燃焼室
底面(9)に前記の点火室(6)を介して対峙するよう
になっている。そして、その噴射ノズル(8)から噴出
した燃料の噴射流(10)は、上記の燃焼室底面(9)
に衝突してから、燃焼室半径方向へ向かって放射状に拡
散し、その間において図の斜線で示すような周辺部分の
空気と接触して、空気との混合気を形成するようになっ
ている。
BACKGROUND OF THE INVENTION An example of this type of internal combustion engine is the one shown in FIG. In this device, a cylinder head (3) is attached to a piston (2) inserted vertically and slidably into a cylinder (1).
) The piston head (4) facing the combustion chamber (
5), and a straight cylindrical ignition chamber (6) whose one end side opens facing the combustion chamber (5) is provided in the cylinder head (3), and at the back of the ignition chamber (6). An injection nozzle (8) of a fuel injection valve (7) is arranged. The injection nozzle (8) is inserted into the ignition chamber (6) when the piston (5) approaches the top dead center. It is now possible to confront each other through. The injection flow (10) of fuel ejected from the injection nozzle (8) is directed to the bottom surface (9) of the combustion chamber.
After colliding with the air, the air diffuses radially in the radial direction of the combustion chamber, and during that time it comes into contact with the air in the surrounding area as shown by the hatched area in the figure, forming a mixture with the air.

また、シリンダヘッド(3)には、前記の点火室(6)
に臨んでスパーク電極部(11)が配設された点火プラ
グ(12)が設けられている。この点火プラグ(12)
には、前記の噴射ノズル(8)から燃料が噴射されてい
る途中の適当なタイミングを見計らって高電圧がかけら
れ、上記のスパーク電極部(11)においてスパーク火
花が発生するようになっている。すなわち、点火室(6
)では、噴射ノズル(8)から噴射された燃料による濃
混合気が、上記のスパーク火花によって着火するように
なっており、その火炎噴流が前記の燃焼室(5)に伝播
して、その燃焼室(5)にある大量の混合気が点火され
て、主燃焼が発生するようになっている。
In addition, the cylinder head (3) has the above-mentioned ignition chamber (6).
A spark plug (12) with a spark electrode portion (11) facing the spark plug (12) is provided. This spark plug (12)
A high voltage is applied to the fuel at an appropriate timing while fuel is being injected from the injection nozzle (8), so that spark sparks are generated at the spark electrode (11). . That is, the ignition chamber (6
), the rich mixture of fuel injected from the injection nozzle (8) is ignited by the spark, and the flame jet propagates to the combustion chamber (5), causing its combustion. The large amount of air-fuel mixture in chamber (5) is ignited so that main combustion occurs.

発明が解決しようとする問題点 しかしながら、上記従来技術では、燃焼室底面に噴霧流
を衝突するようになっているため、その燃焼室底面によ
って燃焼室半径外方向へ拡散した燃料噴霧の上部側しか
空気と接触せず、接触面積が少なくなって混合気形成速
度が遅くなり、上記の点火室において生じた火炎噴流に
よる燃焼室の主燃焼が遅れて、燃焼効率が悪くなるとい
う問題点があった。
Problems to be Solved by the Invention However, in the above-mentioned prior art, since the spray flow collides with the bottom surface of the combustion chamber, only the upper side of the fuel spray diffused in the radial direction of the combustion chamber by the bottom surface of the combustion chamber is There was a problem in that it did not come into contact with air, and the contact area was reduced, slowing the rate of mixture formation, and the main combustion in the combustion chamber due to the flame jet generated in the ignition chamber was delayed, resulting in poor combustion efficiency. .

この発明は、このような問題点に鑑みて、前記のような
燃料噴射弁の噴射ノズルと点火プラグのスパーク電極部
とをシリンダヘッドに設けた点火室へ臨んで配設するよ
うにした内燃機関において、混合気形成速度を早めて、
燃焼効率を向上させること目的として成されたものであ
る。
In view of these problems, the present invention provides an internal combustion engine in which the injection nozzle of the fuel injection valve and the spark electrode part of the ignition plug are arranged facing an ignition chamber provided in the cylinder head. , the speed of mixture formation is increased,
The purpose was to improve combustion efficiency.

問題点を解決するための手段 上記目的を達成するための手段を、この発明の一実施例
に対応する第1図を用いて説明する。
Means for Solving the Problems Means for achieving the above object will be explained using FIG. 1, which corresponds to an embodiment of the present invention.

すなわち、この発明では、シリンダ(15)へ摺動自在
に内挿したピストン(16)の、シリンダヘッド(17
)に対面したピストンヘッド(18)を窪ませて燃焼室
(19)を形成するとともに、燃料噴射弁(23)の噴
射ノズル(24)から点火室(22)を介して燃焼室(
19)へ噴射される噴射燃料を燃焼室半径外方向へ拡散
させる衝突面(25)を有する凸状台部(21)を、燃
焼室底面(20)から上方に突出させている。
That is, in the present invention, the cylinder head (17) of the piston (16) is slidably inserted into the cylinder (15).
) is recessed to form a combustion chamber (19), and the combustion chamber (
A convex platform (21) having an impact surface (25) that diffuses the injected fuel injected into the combustion chamber 19) in a radially outward direction of the combustion chamber protrudes upward from the bottom surface (20) of the combustion chamber.

作    用 すなわち、前記の噴射ノズル(24)から噴出した噴霧
流は、燃焼室底面(20)から突出した衝突面(25)
に衝突して、燃焼室(19)の上下中間部分において燃
焼室半径方向に拡散することになるから、その拡散され
た燃料噴霧が、上下両側の空気と接触することになり、
燃料噴霧と空気との接触面積が相対的に増加して混合気
形成速度が早くなる。したがって、燃焼室(19)へ臨
んで開口した点火室(22)から噴出した火炎噴流によ
り、燃焼室(19)の混合気が急速燃焼する。
In other words, the spray jet ejected from the injection nozzle (24) hits the collision surface (25) protruding from the bottom surface (20) of the combustion chamber.
Since the fuel spray collides with the combustion chamber (19) and diffuses in the radial direction of the combustion chamber (19) in the upper and lower intermediate portions, the diffused fuel spray comes into contact with the air on both the upper and lower sides.
The contact area between the fuel spray and air increases relatively, and the rate of mixture formation becomes faster. Therefore, the air-fuel mixture in the combustion chamber (19) is rapidly combusted by the flame jet ejected from the ignition chamber (22) which is open facing the combustion chamber (19).

実施例 以下、この発明の一実施例を図面に基づいて説明する。Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

第1図において、(13)は、エンジン本体(14)の
シリンダブロックを示し、このシリンダブロック(13
)に設けられた上下方向のシリンダ(15)には、ピス
トン(16)が上下摺動自在に内挿されている。このピ
ストン(16)には、上記シリンダブロック(13)の
上部に設けられたシリンダヘラド(17)に面したピス
トンヘッド(18)を窪ませた燃焼室(19)が形成さ
れている。この燃焼室(19)は、第2図に示すように
、その燃焼室中心がピストン中心から一方の側に偏って
おり、上記のシリンダヘッド(17)と向き合う燃焼室
底面(20)には、その中央部分において上方に突出す
る断面円形状の凸状台部(21)が一体に設けられてい
る。なお、この凸状台部(21)の半径R1は、燃焼室
半径R2の30%〜70%とするのが望ましく、同じく
凸状台部(21)の燃焼室底面(20)からの高さHl
を、燃焼室深さH2の30%〜80%とするのが望まし
い。
In FIG. 1, (13) indicates the cylinder block of the engine body (14), and this cylinder block (13) indicates the cylinder block of the engine body (14).
) A piston (16) is inserted into the vertical cylinder (15) so as to be vertically slidable. This piston (16) is formed with a combustion chamber (19) in which a piston head (18) facing a cylinder head (17) provided at the top of the cylinder block (13) is recessed. As shown in FIG. 2, the combustion chamber (19) has its center offset to one side from the piston center, and the bottom surface (20) of the combustion chamber facing the cylinder head (17) has a A convex pedestal (21) having a circular cross section and protruding upward is integrally provided at its central portion. The radius R1 of the convex base (21) is preferably 30% to 70% of the radius R2 of the combustion chamber, and the height of the convex base (21) from the bottom surface (20) of the combustion chamber Hl
It is desirable to set the depth H2 to 30% to 80% of the combustion chamber depth H2.

一方、シリンダヘッド(17)には、前記の燃焼室(1
9)に臨んで開口する直筒状の点火室(22)が、上記
凸状台部(21)の鉛直上方に配設されている。そして
、その点火室(22)の奥には、燃料噴射弁(23)の
上下方向に配向した噴射ノズル(24)が設けられてお
り、その噴射ノズル(24)から垂直下方に噴射された
燃料噴霧は、図のFで示した矢印のように、点火室(2
2)の中央部分を通り、その噴射方向を横切るように配
置された上記凸状台部(21)の水平方向の衝突面(2
5)へ衝突するようになっている。すなわち、この実施
例では、前記の噴射ノズル(24)から噴射された噴霧
流は、略90°の衝突角度でもって衝突面(25)へ衝
突することになる。
On the other hand, the cylinder head (17) has the combustion chamber (1
A straight cylindrical ignition chamber (22) that opens facing the ignition chamber 9) is disposed vertically above the convex platform (21). An injection nozzle (24) oriented in the vertical direction of the fuel injection valve (23) is provided at the back of the ignition chamber (22), and fuel is injected vertically downward from the injection nozzle (24). The spray is directed to the ignition chamber (2) as shown by the arrow F in the figure.
The horizontal collision surface (2) of the convex platform (21) is arranged to pass through the central part of the convex platform (21) and cross the injection direction.
5). That is, in this embodiment, the spray stream injected from the injection nozzle (24) collides with the impact surface (25) at an impact angle of approximately 90°.

また、上記の点火室(22)の周壁部分に開口された傾
斜状の横穴(26)には、先端部分のスパーク電極部(
27)を点火室(22)へ臨んで配置した点火プラグ(
28)が配設されている。なお、(29)は1.上記の
燃料噴射弁(23)と並んで上下方向に配設された吸気
弁を示し、この吸気弁(29)を開閉することにより、
シリンダヘッド(17)に設けた吸気通路(30)を介
して前記の燃焼室(19)へ新気を導入するようになっ
ている。
In addition, the spark electrode portion (
The spark plug (27) is placed facing the ignition chamber (22).
28) is provided. Note that (29) is 1. It shows an intake valve arranged vertically alongside the above-mentioned fuel injection valve (23), and by opening and closing this intake valve (29),
Fresh air is introduced into the combustion chamber (19) through an intake passage (30) provided in the cylinder head (17).

さて、以上のような構造をした燃焼室形状において、前
記の燃料噴射弁(23)の噴射ノズル(24)から噴射
された噴霧流は、第3図に示すように前記の凸状台部(
21)の円形状をした衝突面(25)の略中央に衝突し
た後、その衝突面(25)に添って燃焼室半径外方向へ
放射伏に拡散することになる。したがって、その拡散噴
霧は、図の斜線範囲で示すように、上下両側において空
気と接触することになり、接触面積が増大して混合気形
成速度が向上することになる。
Now, in the combustion chamber having the above-described structure, the spray flow injected from the injection nozzle (24) of the fuel injection valve (23) is directed to the convex platform (2) as shown in FIG.
After colliding with the approximate center of the circular collision surface (25) of 21), the particles radially spread outward in the radial direction of the combustion chamber along the collision surface (25). Therefore, the diffused spray comes into contact with air on both the upper and lower sides, as shown by the shaded area in the figure, and the contact area increases, resulting in an improvement in the air-fuel mixture formation rate.

しかも、この実施例では、凸状台部(21)に設けた衝
突面(25)の略中央に、噴霧流を垂直に衝突するよう
にしたことにより、前記の点火室(22)において生じ
た火炎噴流(32)が、第2図の2点鎖線で示すように
、凸状台部(21)の衝突面(25)へ衝突して、その
衝突面(25)の付近に滞留する比較的高濃度の混合気
を確実に燃焼させるばかりでなく、燃焼室(19)の中
央付近から周囲の燃焼室側壁面(31)へ向けて略対称
的に燃え拡がることにより、均一な燃焼性能が得られる
という利点がある。
Moreover, in this embodiment, by making the spray flow perpendicularly collide with approximately the center of the collision surface (25) provided on the convex platform (21), the above-mentioned ignition chamber (22) The flame jet (32) collides with the collision surface (25) of the convex platform (21), as shown by the two-dot chain line in FIG. Uniform combustion performance is achieved by not only reliably burning a highly concentrated air-fuel mixture, but also by spreading the flame approximately symmetrically from near the center of the combustion chamber (19) toward the surrounding combustion chamber side wall surface (31). It has the advantage of being able to

特に、この実施例のように、凸状台部(21)の半径R
1を、燃焼室半径R2の30%〜70%とすることによ
り、前記の噴射ノズル(24)から噴射された噴霧流が
、凸状台部(21)の衝突面(25)へ確実に衝突する
だけでな(、その衝突面(25)にそって周囲へ拡散し
た燃料噴霧が燃焼室側壁面(31)へ直接衝突するのが
防止されるという利点がある。また、同じく凸状台部(
21)の燃焼室底面(20)からの高さHlを、燃焼室
深さH2の30%〜80%とすることにより、衝突面(
25)に添って拡散する燃料噴霧の上下両方の空気を特
に有効−1用できるという利点もある。
In particular, as in this embodiment, the radius R of the convex platform (21)
By setting 1 to 30% to 70% of the combustion chamber radius R2, the spray stream injected from the injection nozzle (24) reliably collides with the collision surface (25) of the convex platform (21). This has the advantage that the fuel spray diffused to the surroundings along the collision surface (25) is prevented from directly colliding with the side wall surface (31) of the combustion chamber. (
The collision surface (
25) There is also the advantage that the air both above and below the fuel spray that is diffused along the lines can be used particularly effectively.

第4図は、この発明の別の実施例を示す、この実施例で
は、ピストンヘッド(18)の中央部分を窪ませて、燃
焼室(19)の燃焼室中心をピストン中心に一致させて
いる。そして、シリンダヘッド(17)に設けた直筒状
の点火室(22)の配向方向を、その点火室(22)の
奥に配置した燃料噴射弁(23)の噴射ノズル(24)
から噴出した噴霧流が、上記のピストン(16)が上死
点へ移動したときにおける凸状台部(21)の衝突面(
25)に対して、例えば45°の衝突角度でもって斜め
に衝突するようにしている。なお、この実施例では、シ
リンダヘッド(17)に設けた吸気弁(29)と前記の
燃料噴射弁(23)との間に点火プラグ(28)を配設
し、その点火プラグ(28)のスパーク電極部(27)
を前記の点火室(22)へ臨んで配置している。
FIG. 4 shows another embodiment of the present invention. In this embodiment, the center portion of the piston head (18) is recessed to align the center of the combustion chamber (19) with the center of the piston. . Then, the orientation direction of the straight cylindrical ignition chamber (22) provided in the cylinder head (17) is aligned with the injection nozzle (24) of the fuel injection valve (23) arranged at the back of the ignition chamber (22).
The spray stream ejected from the collision surface (
25), the collision is made obliquely, for example, at a collision angle of 45°. In this embodiment, a spark plug (28) is provided between the intake valve (29) provided in the cylinder head (17) and the fuel injection valve (23), and the spark plug (28) is Spark electrode part (27)
is arranged facing the ignition chamber (22).

このように、点火室(22)を傾斜状に配置したことに
より、比較的大きな設置スペースを必要とする燃料噴射
弁(23)が傾斜状に配設することが可能となり、第1
図実施例のように燃料噴射弁(23)を上下方向に配設
するレイアウト構造を取りにくい場合においても、燃焼
室底面(20)から突出した凸状台部(21)の衝突面
(25)へ噴霧流を衝突させることができるという実益
がある。
By arranging the ignition chamber (22) in an inclined manner as described above, it becomes possible to arrange the fuel injection valve (23) in an inclined manner, which requires a relatively large installation space.
Even when it is difficult to adopt a layout structure in which the fuel injection valves (23) are disposed vertically as in the example shown in the figure, the collision surface (25) of the convex platform (21) protruding from the bottom surface (20) of the combustion chamber There is a practical benefit of being able to impinge the spray stream on

なお、この実施例においても、凸状台部(21)の半径
R1は、燃焼室半径R2の30%〜70%とするのが望
ましく、同じく凸状台部(21)の燃焼室底面(20)
からの高さHlを、燃焼室深さH2の30%〜80%と
するのが望ましい。
In this embodiment as well, it is desirable that the radius R1 of the convex platform (21) is 30% to 70% of the radius R2 of the combustion chamber. )
It is desirable that the height Hl from the combustion chamber is 30% to 80% of the combustion chamber depth H2.

発明の効果 以上のように、この発明では、燃料噴射弁の噴射ノズル
と点火プラグの電極部とを、シリンダヘッドに設けた点
火室へ臨んで配置したものにおいて、シリンダへ摺動自
在に内挿したピストンの、上記のシリンダヘッドに対面
したピストンヘッドを窪ませて燃焼室を形成するととも
に、前記の噴射ノズルから点火室を介して燃焼室へ噴射
された噴射燃料を燃焼室半径外方向へ拡散させる衝突面
を有する凸状台部を、燃焼室底面から上方に突出したこ
とにより、燃焼室半径方向へ拡散する燃料噴霧は、上下
両側において空気と接触することになり、従来のように
単純に対向壁へ燃料噴霧を衝突させる場合よりも、燃料
と空気の接触面積が相対的に増大することになり、混合
気形成速度が早くなって、前記の点火室から噴出する火
炎噴流が燃焼室の混合気へ速やかに伝播し、混合気が急
速に燃焼して排気ガスが清浄化するばかりでなく、燃焼
効率が向上することにより高出力化するという利点があ
る。
Effects of the Invention As described above, in this invention, the injection nozzle of the fuel injection valve and the electrode part of the spark plug are arranged so as to face the ignition chamber provided in the cylinder head, and are slidably inserted into the cylinder. The piston head of the piston facing the cylinder head is recessed to form a combustion chamber, and the injected fuel injected from the injection nozzle into the combustion chamber via the ignition chamber is diffused radially outward of the combustion chamber. By protruding upward from the bottom surface of the combustion chamber, the convex platform having a collision surface causes the fuel spray that diffuses in the radial direction of the combustion chamber to come into contact with the air on both the top and bottom sides, making it difficult to simply Compared to the case where the fuel spray collides with the opposing wall, the contact area between the fuel and the air becomes relatively larger, the mixture formation speed becomes faster, and the flame jet ejected from the ignition chamber enters the combustion chamber. This has the advantage that it not only quickly propagates to the air-fuel mixture and rapidly burns the air-fuel mixture to purify the exhaust gas, but also increases combustion efficiency and increases output.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、この発明の一実施例を示す燃焼室付近の縦断
面図、第2図は、第1図のA−A線断面図、第3図は、
燃焼室における噴霧流の流を示す燃焼室付近の概略縦断
面図、第4図は、この発明の別の実施例を示す燃焼室付
近の縦断面図、第5図は、従来例を示す燃焼室付近の概
略縦断面図である。 (15)・・・シリンダ、(16)・・・ピストン、(
17) ・・・シリンダヘッド、 (18)・・・ピストンヘッド、(19)・・・燃焼室
、(20)・・・燃焼室底面、(21)・・・凸状台部
、(22)・・・点火室、(25)・・・衝突面。
FIG. 1 is a longitudinal cross-sectional view of the vicinity of the combustion chamber showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG.
FIG. 4 is a schematic vertical cross-sectional view of the vicinity of the combustion chamber showing the flow of the spray in the combustion chamber. FIG. 4 is a vertical cross-sectional view of the vicinity of the combustion chamber showing another embodiment of the present invention. FIG. FIG. 3 is a schematic vertical cross-sectional view of the vicinity of the chamber. (15)...Cylinder, (16)...Piston, (
17) Cylinder head, (18) Piston head, (19) Combustion chamber, (20) Bottom of combustion chamber, (21) Convex base, (22) ...Ignition chamber, (25)...Collision surface.

Claims (1)

【特許請求の範囲】 1、燃料噴射弁の噴射ノズルと点火プラグのスパーク電
極部とを、シリンダヘッドに設けた点火室へ臨んで配置
したものにおいて、 シリンダへ摺動自在に内挿したピストンの、上記のシリ
ンダヘッドに対面したピストンヘッドを窪ませて燃焼室
を形成するとともに、前記の噴射ノズルから点火室を介
して燃焼室へ噴射された噴射燃料を燃焼室半径外方向へ
拡散させる衝突面を有する凸状台部を、燃焼室底面から
上方に突出したことを特徴とする内燃機関。 2、上記の凸状台部を断面円形状として、その半径を、
燃焼室半径の30%〜70%とするとともに、同じく凸
状台部の燃焼室底面からの高さを、燃焼室深さの30%
〜80%とした特許請求の範囲第1項記載の内燃機関。
[Scope of Claims] 1. In a structure in which the injection nozzle of a fuel injection valve and the spark electrode part of a spark plug are arranged facing an ignition chamber provided in a cylinder head, a piston is slidably inserted into a cylinder. , an impact surface which forms a combustion chamber by recessing the piston head facing the cylinder head, and which diffuses the injected fuel injected from the injection nozzle into the combustion chamber via the ignition chamber in a radial direction of the combustion chamber; What is claimed is: 1. An internal combustion engine characterized in that a convex pedestal having a shape protrudes upward from a bottom surface of a combustion chamber. 2. The above convex platform has a circular cross section, and its radius is
The radius of the combustion chamber should be 30% to 70%, and the height of the convex platform from the bottom of the combustion chamber should be 30% of the depth of the combustion chamber.
The internal combustion engine according to claim 1, wherein the ratio is 80%.
JP62011809A 1987-01-21 1987-01-21 Internal combustion engine Pending JPS63179123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62011809A JPS63179123A (en) 1987-01-21 1987-01-21 Internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62011809A JPS63179123A (en) 1987-01-21 1987-01-21 Internal combustion engine

Publications (1)

Publication Number Publication Date
JPS63179123A true JPS63179123A (en) 1988-07-23

Family

ID=11788153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62011809A Pending JPS63179123A (en) 1987-01-21 1987-01-21 Internal combustion engine

Country Status (1)

Country Link
JP (1) JPS63179123A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02239933A (en) * 1989-03-15 1990-09-21 Asahi Chem Ind Co Ltd Biaxially stretched styrene-based resin heat resistant laminated sheet
DE4324642A1 (en) * 1992-07-22 1994-01-27 Fuji Heavy Ind Ltd Combustion chamber for an internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02239933A (en) * 1989-03-15 1990-09-21 Asahi Chem Ind Co Ltd Biaxially stretched styrene-based resin heat resistant laminated sheet
DE4324642A1 (en) * 1992-07-22 1994-01-27 Fuji Heavy Ind Ltd Combustion chamber for an internal combustion engine

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