JPS6282222A - Combustion chamber structure in engine - Google Patents

Combustion chamber structure in engine

Info

Publication number
JPS6282222A
JPS6282222A JP60221402A JP22140285A JPS6282222A JP S6282222 A JPS6282222 A JP S6282222A JP 60221402 A JP60221402 A JP 60221402A JP 22140285 A JP22140285 A JP 22140285A JP S6282222 A JPS6282222 A JP S6282222A
Authority
JP
Japan
Prior art keywords
combustion chamber
intake
spark plug
fuel injection
valves
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
JP60221402A
Other languages
Japanese (ja)
Inventor
Hiroyuki Oda
博之 小田
Toshiharu Masuda
益田 俊治
Hiroyasu Uchida
浩康 内田
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP60221402A priority Critical patent/JPS6282222A/en
Publication of JPS6282222A publication Critical patent/JPS6282222A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02F1/42Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20SOHC [Single overhead camshaft]

Landscapes

  • 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 make a combustion chamber perform stratified combustion so easily while aiming at improvement in charging efficiency at the time of high load, by adjoining a spark plug to the combustion chamber through between respective exhaust valves as well as adjoining a fuel injection nozzle to the combustion chamber through between these valves. CONSTITUTION:Respective suction valves 6 and 7 and exhaust valves 8 and 9 are all driven by a cam shaft 17 via swing arms 18 and 19. A spark plug 22 passes through between these exhaust valves 8 and 9 and its tip is adjoined to the vicinity of the central part of a combustion chamber 4. A fuel injection nozzle 23 passes through between these suction valves 6 and 7 and adjoins to the vicinity of the central part of the combustion chamber 4 as well. Thus, as aiming at improvement in charging efficiency at the time of high load, stratified combustion is made possible to be done so easily.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、1気筒当り2つずつの吸気バルブおよび排気
バルブを備えたエンジンにおいて、筒中な構造で成層燃
焼を図るようにした燃焼室構造に関するものである。
Detailed Description of the Invention (Industrial Application Field) The present invention relates to a combustion chamber structure in which stratified combustion is achieved in an in-cylinder structure in an engine equipped with two intake valves and two exhaust valves per cylinder. It is related to.

(従来技術) 従来から、低負荷時に燃料を相対的に点火プラグ付近に
多く供給して成層燃焼を行むわぜることにより、全体的
には混合気を希薄化しつつ燃焼を可能にして燃費の節減
を図るようにする技術は一般に知られている。特にこの
J:うへ成層燃焼を行なわせる場合に、例えば実開昭5
8−56117号公報にみられるように、点火プラグの
先端部を燃焼室に臨ませるとともに、燃料噴射ノズルら
その燃料噴孔部を点火プラグの先端部に対向させて燃焼
室に臨ませることにより、燃料を直接点火プラグの先端
付近に噴射して筒中な構造で成層化を容易にするように
したものも提案されている。従来のこの種の構造は、燃
焼室にり・1して吸気バルブおよσtJF気バルブがそ
れぞれ1つずつ設けられていて他の部材を配備するに充
分41余地があるエンジンに適用されている。
(Prior art) Conventionally, at low loads, a relatively large amount of fuel is supplied near the spark plug to perform stratified combustion, which enables combustion while diluting the mixture as a whole, thereby reducing fuel consumption. Techniques for achieving savings are generally known. In particular, when performing stratified combustion, for example,
As seen in Publication No. 8-56117, the tip of the spark plug is made to face the combustion chamber, and the fuel injection nozzle and other fuel injection holes are made to face the tip of the spark plug and face the combustion chamber. There have also been proposals in which fuel is directly injected near the tip of the spark plug to facilitate stratification with an in-cylinder structure. Conventionally, this type of structure is applied to engines in which the combustion chamber is provided with one intake valve and one σtJF air valve, and there is sufficient room for other components. .

ところで、高負荷時の吸気充填効率を高めて高出力化を
図るため、吸気バルブJ5よび排気バルブをそれぞれ1
気筒当り2つずつ配設し、ざらに動弁系のコストダウン
のため、上記吸気バルブおよび排気バルブを1つのカム
シャフトによりスイングアームを介して駆動するように
したエンジンがあり、この種のエンジンでも低負荷時に
は燃費節減のため成層燃焼を行なうようにすることが望
まれる。しかしながらこのようなエンジンでは、吸。
By the way, in order to increase the intake air filling efficiency under high load and achieve high output, the intake valve J5 and the exhaust valve are each set to 1.
Some engines have two per cylinder, and in order to reduce the cost of the valve train, the intake valve and exhaust valve are driven by a single camshaft via a swing arm. However, it is desirable to perform stratified combustion at low loads to reduce fuel consumption. However, in such an engine, the intake.

排気バルブが多弁化されるとともにその上方に動弁系が
存在するため、他の部材を組込むための余裕が少なく、
また他の部材を組込むことによって吸気ボー1−が屈曲
したりその開口面積が小さくなったりすると吸気抵抗が
増加して高出力化の要求に反する。これらのことから、
従来では上記の多弁化されたエンジンに点火プラグおよ
び燃料噴射ノズルを合理的に組込んで成層燃焼を達成す
るようにしたものは開発されていなかった。
As exhaust valves become more numerous and the valve train is located above them, there is less room to incorporate other parts.
Furthermore, if the intake bow 1- is bent or its opening area is reduced by incorporating other members, the intake resistance increases, which goes against the demand for high output. from these things,
Until now, no engine has been developed in which a spark plug and a fuel injection nozzle are rationally incorporated into the multi-valve engine to achieve stratified combustion.

(発明の目的) 本発明は、このような事情に鑑みて、1気筒当り2つず
つの吸気バルブおよび排気バルブとこれらを1つのカム
シャフトにより駆動する動弁機構とを備えたエンジンに
おいて、吸、排気バルブと干渉したり吸気抵抗を増加さ
せたりすることなく点火プラグおよび燃料噴射ノズルを
それぞれ燃焼室に臨ませてシリンダヘッドに組込むこと
ができ、高負荷峙の出力向上を図りつつ、低負荷時の成
層燃焼を容易にするエンジンの燃焼室構造を提供するも
のである。
(Object of the Invention) In view of the above circumstances, the present invention provides an intake valve and an exhaust valve for each cylinder in an engine equipped with two intake valves and two exhaust valves, and a valve mechanism that drives these by one camshaft. , the spark plug and fuel injection nozzle can be installed in the cylinder head facing the combustion chamber without interfering with the exhaust valve or increasing intake resistance, which improves output under high loads and improves output under low loads. The present invention provides a combustion chamber structure for an engine that facilitates stratified combustion during combustion.

(発明の構成) 本発明は、シリンダヘッドの幅方向の中央部に1つのカ
ムシャフトを配没し、このカムシャフトによりスイング
アームを介して2つの吸気バルブおよび2つの排気バル
ブを駆動するように構成したエンジンにおいて、点火プ
ラグを、上記各排気バルブ間を通りかつ先端部が燃焼室
の中央部刊近に臨むように設けるとともに、燃料噴射ノ
ズルを、各吸気バルブ間を通りかつ燃料噴孔部が上記点
火プラグの先端部と対向して燃焼室の中央部付近に臨む
ように設けたものである。
(Structure of the Invention) The present invention has one camshaft disposed in the center of the cylinder head in the width direction, and this camshaft drives two intake valves and two exhaust valves via a swing arm. In the configured engine, the spark plug is provided so as to pass between each of the exhaust valves and its tip faces toward the center of the combustion chamber, and the fuel injection nozzle is provided so as to pass between each intake valve and face the fuel injection hole. is provided so as to face the tip of the spark plug and face near the center of the combustion chamber.

つまり、吸気系と比べて排気系のバルブ径およびボート
径は小さくて済むことと、燃料噴射ノズルは点火プラグ
と比べて細くすることができることに着目し、2つの排
気バルブ間と2つの吸気バルブ間とに、特に吸気バルブ
を細くしたり屈曲させたりすることなく、点火プラグお
よび燃料噴射ノズルを成層燃焼に適した配置に組込むよ
うにしたものである。
In other words, we focused on the fact that the exhaust system's valve diameter and boat diameter can be smaller than the intake system, and that the fuel injection nozzle can be made thinner than the spark plug. In between, the ignition plug and fuel injection nozzle are incorporated in an arrangement suitable for stratified combustion without making the intake valve particularly thin or bent.

(実施例) 第1図および第2図は本発明の一実施例を示し、これら
の図において、1はシリンダブロック、2はシリンダヘ
ッド、3はシリンダブロック1のボア内に挿入されたビ
スミーンであり、ピストン3とシリンダヘッド下面2a
との間に燃焼室4が形成されている。図示の実施例にお
ける燃焼室4は、上記シリンダヘッド下面2aが偏平と
され、かつピストン3の頂面に、その周部に偏平面3a
を残した状態で凹状のキャビティ5を有する形状となっ
ており、ピストン3の上死点位置で、上記キャビティ5
が主燃焼室を構成するとともにピストン3周部の偏平面
3aとシリンダヘッド下面2aとが微小間隙で対向して
スキッシュゾーンを構成するようにしている。
(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention. In these figures, 1 is a cylinder block, 2 is a cylinder head, and 3 is a bismine inserted into the bore of the cylinder block 1. Yes, piston 3 and cylinder head lower surface 2a
A combustion chamber 4 is formed between the two. In the illustrated embodiment, the combustion chamber 4 has a flat lower surface 2a of the cylinder head, and a flat surface 3a on the top surface of the piston 3 and around the top surface of the piston 3.
It has a shape that has a concave cavity 5 while leaving .
constitutes a main combustion chamber, and the flat surface 3a of the circumferential portion of the piston 3 and the lower surface 2a of the cylinder head face each other with a minute gap to constitute a squish zone.

上記シリンダヘッド2には、1気筒当り2個ずつの吸気
バルブ6.7および排気バルブ8.9が、それぞれシリ
ンダヘッド下面2aに対して垂直な状態で配設されてい
る。そして、上記吸気バルブ6.7により開14される
各吸気ボート10.11と、上記排気バルブ8.9によ
り開閉される排気ボート12.13とがシリンダヘッド
2に形成されている。上記吸気ボート10.11はシリ
ンダヘッド2の一側面2bから燃焼室4に至り、排気ボ
ート12.13はシリンダヘッド2の他側面2Cから燃
焼室4に至るように形成されており、上記各吸気ボート
10.11に連通する吸気通路14および各排気ポート
12.13に連通する排気通路15がシリンダヘッド2
の各側面2b、2Cに連結されている。
The cylinder head 2 is provided with two intake valves 6.7 and two exhaust valves 8.9 per cylinder, each perpendicular to the cylinder head lower surface 2a. The cylinder head 2 is formed with intake boats 10.11 that are opened 14 by the intake valves 6.7, and exhaust boats 12.13 that are opened and closed by the exhaust valves 8.9. The intake boat 10.11 is formed to extend from one side 2b of the cylinder head 2 to the combustion chamber 4, and the exhaust boat 12.13 is formed to extend from the other side 2C of the cylinder head 2 to the combustion chamber 4. An intake passage 14 communicating with the boat 10.11 and an exhaust passage 15 communicating with each exhaust port 12.13 are connected to the cylinder head 2.
It is connected to each side 2b, 2C of.

また、低負荷時には一方の吸気ボート10のみから燃焼
室4に吸気が供給されるようにし、例えば使方の吸気ボ
ート11の上流に低負荷時に111しるスワールコント
ロール弁16を設けておくことにより、低負荷時には上
記一方の吸気ボート10からの吸気によって燃焼室4に
第2図に矢印Aで示すようなスワールが生じるようにし
ている。
In addition, when the load is low, the intake air is supplied to the combustion chamber 4 from only one intake boat 10. For example, by providing a swirl control valve 16 upstream of the intake boat 11 that is being used, which turns 111 when the load is low. When the load is low, the intake air from one of the intake boats 10 creates a swirl in the combustion chamber 4 as shown by arrow A in FIG.

上記各吸気バルブ6.7および各排気バルブ8゜9は、
シリンダヘッド2の上部に装備された1本のカムシャフ
ト17によりスイングアーム18゜19を介してそれぞ
れ駆動されるようになっている。すなわち、上記カムシ
ャフト17はシリンダヘッド2の幅方向の中央部に配置
され、このカムシャフト17の両側方部下方にはカムシ
ャフト17と平行に一対のスイングシャツl〜20.2
1が配設されており、これらのスイングシレフト20゜
21に吸気バルブ用および排気バルブ用の各スイングア
ーム18,19が揺動可能に取付けられている。上記ス
イングアーム18,19は、内側端部の上端がカムシャ
フト17のカム17aに当接するとともに、下端が吸気
バルブ6.7、排気バルブ8.9の各バルブステムの上
端に当接し、カムシャフト17の回転に伴って揺動する
ことにより吸気バルブ6.7J3よび排気バルブ8.9
をそれぞれ所定のタイミングで開閉するようになってい
る。
Each of the above-mentioned intake valves 6.7 and each exhaust valve 8.9 is
They are driven by a single camshaft 17 mounted on the upper part of the cylinder head 2 via swing arms 18 and 19, respectively. That is, the camshaft 17 is arranged at the center in the width direction of the cylinder head 2, and a pair of swing shirts l to 20.2 are arranged parallel to the camshaft 17 below on both sides of the camshaft 17.
1 are disposed, and swing arms 18 and 19 for intake valves and exhaust valves are swingably attached to these swing shafts 20 and 21, respectively. The swing arms 18, 19 have upper ends of their inner ends in contact with the cam 17a of the camshaft 17, and lower ends of the swing arms 18, 19 with the upper ends of the valve stems of the intake valve 6.7 and the exhaust valve 8.9. 17, the intake valve 6.7J3 and the exhaust valve 8.9
are designed to open and close at predetermined timings.

また、シリンダヘッド2には、点火プラグ22および燃
料噴射ノズル23が取付けられており、それぞれの先端
部が上記キャビティ5で構成される主燃焼室に臨んでい
る。
Further, a spark plug 22 and a fuel injection nozzle 23 are attached to the cylinder head 2, and the tips of each face the main combustion chamber formed by the cavity 5.

上記点火プラグ22は各排気バルブ8,9間を通って先
端が燃焼室4の中央部付近に臨むように、シリンダヘッ
ド2の側面部から斜めに形成された点火プラグ挿入孔2
4に取付けられている。上記排気ポート12.13は点
火プラグ挿入孔24を避けるようにやや湾曲した形に形
成されている。
The spark plug 22 passes between the exhaust valves 8 and 9, and the spark plug insertion hole 2 is formed diagonally from the side surface of the cylinder head 2 so that its tip faces near the center of the combustion chamber 4.
It is attached to 4. The exhaust ports 12 and 13 are formed in a slightly curved shape so as to avoid the spark plug insertion hole 24.

一方、点火プラグ22と比べると細く形成されている燃
料噴射ノズル23は、各吸気バルブ6゜7間を通り、か
つ先端の燃料噴孔部23aが点火プラグ22の先端部と
対向して燃焼室4の中央部付近に臨むように、シリンダ
ヘッド2の側面部から斜めに形成されたノズル挿入孔2
5に取付(プられており、この燃料噴財ノズル23の後
部は図外の燃料通路に連結されている。そして、低負荷
時には成層燃焼のため吸気行程終期から圧縮行程初期に
かけて燃料を噴射し、高負荷時には吸気行程初期から、
燃料を噴射するように、図外の制御手段により噴射タイ
ミングが制御されている。なお、前述のように低負荷時
にスワール(矢印A)が生じるようにしている場合に、
燃料噴射ノズル23の燃料噴孔部23aは、上記スワー
ルの方向からみて点火プラグ22の先端より上流側に位
置する排気バルブ8付近に向けて燃料を噴射するように
、噴射方向を設定しておくことが好ましい。第2図中の
一点鎖線Bはこの燃料噴孔部23aからの燃料II?j
Q4方向を示している。
On the other hand, the fuel injection nozzle 23, which is formed thinner than the spark plug 22, passes between each intake valve 6. The nozzle insertion hole 2 is formed obliquely from the side surface of the cylinder head 2 so as to face the vicinity of the center of the cylinder head 2.
The rear part of this fuel injection nozzle 23 is connected to a fuel passage (not shown).At low load, fuel is injected from the end of the intake stroke to the beginning of the compression stroke for stratified combustion. , at high loads, from the beginning of the intake stroke,
The injection timing is controlled by a control means (not shown) so that the fuel is injected. In addition, when swirl (arrow A) is generated at low load as mentioned above,
The injection direction of the fuel injection hole portion 23a of the fuel injection nozzle 23 is set so that fuel is injected toward the vicinity of the exhaust valve 8 located upstream from the tip of the spark plug 22 when viewed from the direction of the swirl. It is preferable. Dot-dash line B in FIG. 2 indicates fuel II from this fuel injection hole portion 23a? j
It shows the Q4 direction.

26はシリンダヘッドカバーであり、27はウォータジ
ャケットである。
26 is a cylinder head cover, and 27 is a water jacket.

以上のような構成によると、燃料噴射ノズル23の燃料
噴孔部23aを点火プラグ22の先端と対向させて燃焼
室4に臨ませていることにより、低負荷時には上記燃料
噴射ノズル23から噴射された燃料が点火プラグ22先
端付近に多く供給されて成層燃焼が行なわれ、燃費の節
減が図られる。
According to the above configuration, the fuel injection hole portion 23a of the fuel injection nozzle 23 faces the tip of the spark plug 22 and faces the combustion chamber 4, so that the fuel is injected from the fuel injection nozzle 23 during low load. A large amount of fuel is supplied to the vicinity of the tip of the spark plug 22, and stratified combustion is performed, thereby reducing fuel consumption.

また、1気筒当り2個ずつの吸気バルブ6.7および排
気バルブ8.9が設けられていることにより高負荷時の
吸気充填効率の向上が図られ、さらにこれらのバルブが
1本のカムシャフト17で駆動されるようにしでいるこ
とにより動弁系のコストダウンが図られる。
In addition, by providing two intake valves 6.7 and two exhaust valves 8.9 per cylinder, intake air filling efficiency during high loads is improved, and these valves are connected to a single camshaft. 17, the cost of the valve train can be reduced.

そして特に、点火プラグ22が各排気バルブ8゜9間に
組込まれ、燃料噴射ノズル23が各吸気バルブ6.7間
に組込まれていることにより、上記の成層燃焼作用と、
高負荷時の充1眞効率向上作用とが共に良好に発揮され
る。つまり、点火プラグ22は高電圧に対する絶縁性等
が要求されることから比較的太くならざるを得ず、この
ため、bし点火プラグ22を吸気バルブ6.7間に配置
しようとすると、吸気ボート10.11はこの点火プラ
グ22を避けるべく小径とするか屈曲させた形状としな
ければならず、吸気抵抗が大きくなる。
In particular, since the spark plug 22 is installed between each exhaust valve 8.9 and the fuel injection nozzle 23 is installed between each intake valve 6.7, the above-mentioned stratified combustion effect,
Both charging and efficiency improvement effects at high loads are well exhibited. In other words, since the spark plug 22 is required to have insulation properties against high voltage, it has to be relatively thick.For this reason, if you try to place the spark plug 22 between the intake valves 6 and 7, 10.11 must have a small diameter or a bent shape to avoid this spark plug 22, which increases intake resistance.

これに対し、燃料哨用ノズル23は点火プラグ222よ
りも細く形成(Jることができるため、これを各吸気バ
ルブ6.7間に組込んでも、吸気ボー)−10,11を
小径化したり屈曲させたりする必要がない。一方、排気
ボート12.13は吸気ボート10.11よりも小径で
よく、かつ多少屈曲させてもあまり充填効率に影響を及
ぼすことはないので、各排気バルブ8.9間に点火プラ
グ22を組込/vでも支障はない。
On the other hand, the fuel nozzle 23 is formed thinner than the spark plug 222 (J), so even if it is installed between each intake valve 6. There is no need to bend it. On the other hand, the exhaust boat 12.13 may have a smaller diameter than the intake boat 10.11, and even if it is bent a little, it will not affect the charging efficiency much, so the spark plug 22 is assembled between each exhaust valve 8.9. There is no problem even if it is included/v.

また、当実施例のように、低負荷時にスワールを生じさ
けるようにするとともに、このスワールの方向からみて
点火プラグ22の先端部より上流の排気バルブ8に向け
て燃1′11が噴射されるように燃料噴射ノズル23か
らの燃料方向を設定しておけば、噴射された燃料が排気
バルブ8により温められて気化が促進されつつ点火プラ
グ22の先端部付近に送られるため、着火性が向上して
成層燃焼がより一層良好に行なわれる。
In addition, as in this embodiment, swirl is avoided at low loads, and the fuel 1'11 is injected toward the exhaust valve 8 upstream from the tip of the spark plug 22 when viewed from the direction of the swirl. If the direction of the fuel from the fuel injection nozzle 23 is set in this manner, the injected fuel is warmed by the exhaust valve 8 and vaporized while being sent to the vicinity of the tip of the spark plug 22, improving ignition performance. As a result, stratified combustion is performed even better.

さらに、燃焼室4の形状としては、実施例のようにシリ
ンダヘッド下面2aを偏平面とし、かつピストン3の頂
面に周部に偏平面3aを残してキャビティ5を形成して
おけば、圧縮行程終期に燃焼室4に強力4丁スキッシュ
が生じて燃焼促進作用が高められ、しかもスキッシュゾ
ーンとなるシリンダヘッド下面2aとピストン3の周部
偏平面3aとの間の隙間の管理が容易となる。また各吸
気バルブ6.7および排気バルブ8.9が偏平なシリン
ダヘッド下面2aに対して垂直な状態に配設されること
に伴い、一対のスインダシ11フI−20。
Furthermore, as for the shape of the combustion chamber 4, if the lower surface 2a of the cylinder head is made into a flat surface as in the embodiment, and the cavity 5 is formed by leaving the flat surface 3a around the top surface of the piston 3, compression can be achieved. A strong four-tooth squish occurs in the combustion chamber 4 at the end of the stroke, increasing the combustion promotion effect, and making it easier to manage the gap between the lower surface 2a of the cylinder head, which forms the squish zone, and the circumferential flat surface 3a of the piston 3. . Further, since each intake valve 6.7 and exhaust valve 8.9 are disposed perpendicularly to the flat lower surface 2a of the cylinder head, the pair of windshields 11 and 8.9 are arranged perpendicularly to the flat lower surface 2a of the cylinder head.

21おJ、び各スイングアーム18.19を近接配置す
ることができ、エンジンの全幅を狭くすることができる
21 and 18 and each swing arm 18 and 19 can be arranged close to each other, and the overall width of the engine can be narrowed.

なお、低負荷時にス1ノールを生じさせる手段としては
、上記実施例のほかにも、例えば第3図に示すように、
両吸気ポート10.11に連通1−る吸気通路14に、
低負荷時に閉じて高負荷時に聞くシャッター弁16′を
設けるとともに、このシャッター弁16′をバイパスし
て下流端が一方の吸気ボート10に連通するにうにした
比較的通路面積が小さい補助吸気通路14aを設け、低
負荷時にこの補助吸気通路14aから吸気を供給するよ
うにしてもよい。このようにすれば低負荷時の吸気流速
およびスワールをより増大させることができる。
In addition to the above-mentioned embodiments, as a means for causing a snort at low load, for example, as shown in FIG. 3,
An intake passage 14 communicating with both intake ports 10.11,
An auxiliary intake passage 14a having a relatively small passage area is provided with a shutter valve 16' that closes at low load and opens at high load, and bypasses this shutter valve 16' so that its downstream end communicates with one of the intake boats 10. may be provided, and intake air may be supplied from this auxiliary intake passage 14a during low load. In this way, it is possible to further increase the intake flow velocity and swirl at low load.

また、燃焼室4の形状も上記実施例に限定されず、例え
ばシリンダヘッド下面2aを屋根形に窪ませたベントル
ーフ型等も採用し得る。
Further, the shape of the combustion chamber 4 is not limited to the above-mentioned embodiment, and for example, a vent roof type in which the lower surface 2a of the cylinder head is recessed in the shape of a roof may be adopted.

(発明の効m> 以上のように本発明は、1気筒に2つの吸気バルブと2
つの排気バルブとを備え、かつこれらのバルブが1つの
カムシャフトで駆動されるようにしたエンジンにおいて
、比較的太い点火プラグを各排気バルブ間を通して燃焼
室に臨まぜるとともに、点火プラグに比べて細い燃料噴
射ノズルを各吸気バルブ間を通して燃焼室に臨まけてい
るため、多弁化されたエンジンのシリンダヘッドに合理
的に点火プラグと燃料噴射ノズルとが組込まれ、吸気抵
抗を増大させず高負荷時の充填効率の向上を図りつつ、
容易に成層燃焼を行なわせることができるものである。
(Effects of the invention m> As described above, the present invention has two intake valves and two intake valves in one cylinder.
In an engine that is equipped with two exhaust valves and these valves are driven by one camshaft, a relatively thick spark plug is passed between each exhaust valve and faces the combustion chamber, and a spark plug that is thinner than the spark plug is inserted between the exhaust valves. Since the fuel injection nozzle faces the combustion chamber through between each intake valve, the spark plug and fuel injection nozzle can be rationally integrated into the cylinder head of a multi-valve engine, and it can be used under high loads without increasing intake resistance. While aiming to improve the filling efficiency of
This allows stratified combustion to be carried out easily.

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

第1図は本発明の一実施例を示す断面図、第2図はシリ
ンダヘッドの概略底面図、第3図は別の実施例を示ηシ
リンダヘッドの概略底面図である。 1・・・シリンダブロック、2・・・シリンダヘッド、
3・・・ピストン、4・・・燃焼室、6.7・・・吸気
バルブ、8.9・・・排気バルブ、22・・・点火プラ
グ、23・・・燃料噴射ノズル、23a・・・燃料噴孔
部。 特許出願人     マ ツ ダ 株式会社代 理 人
     弁理士  半行 悦司同       弁理
士  長1) 上向       弁理士  仮谷 康
夫第  1  図 第  2  図
FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a schematic bottom view of a cylinder head, and FIG. 3 is a schematic bottom view of a cylinder head showing another embodiment. 1... Cylinder block, 2... Cylinder head,
3... Piston, 4... Combustion chamber, 6.7... Intake valve, 8.9... Exhaust valve, 22... Spark plug, 23... Fuel injection nozzle, 23a... Fuel injection hole. Patent Applicant Mazda Co., Ltd. Agent Patent Attorney Etsushi Hangyo Patent Attorney Chief 1) Patent Attorney Yasuo Kariya Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] 1、シリンダヘッドの幅方向の中央部に1つのカムシャ
フトを配設し、このカムシャフトによりスイングアーム
を介して2つの吸気バルブおよび2つの排気バルブを駆
動するように構成したエンジンにおいて、点火プラグを
、上記各排気バルブ間を通りかつ先端部が燃焼室の中央
部付近に臨むように設けるとともに、燃料噴射ノズルを
、各吸気バルブ間を通りかつ燃料噴孔部が上記点火プラ
グの先端部と対向して燃焼室の中央部付近に臨むように
設けたことを特徴とするエンジンの燃焼室構造。
1. In an engine configured such that one camshaft is disposed in the center of the cylinder head in the width direction, and this camshaft drives two intake valves and two exhaust valves via a swing arm, the spark plug A fuel injection nozzle is provided so that it passes between each of the exhaust valves and its tip faces near the center of the combustion chamber, and a fuel injection nozzle is provided that passes between each intake valve and has a fuel injection hole that meets the tip of the spark plug. A combustion chamber structure for an engine, characterized in that the combustion chambers are arranged so as to face each other and face near the center of the combustion chamber.
JP60221402A 1985-10-03 1985-10-03 Combustion chamber structure in engine Pending JPS6282222A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60221402A JPS6282222A (en) 1985-10-03 1985-10-03 Combustion chamber structure in engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60221402A JPS6282222A (en) 1985-10-03 1985-10-03 Combustion chamber structure in engine

Publications (1)

Publication Number Publication Date
JPS6282222A true JPS6282222A (en) 1987-04-15

Family

ID=16766189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60221402A Pending JPS6282222A (en) 1985-10-03 1985-10-03 Combustion chamber structure in engine

Country Status (1)

Country Link
JP (1) JPS6282222A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62191616A (en) * 1986-02-18 1987-08-22 Mazda Motor Corp Fuel injection type engine
DE3903842A1 (en) * 1988-02-10 1989-09-14 Toyota Motor Co Ltd OTTO INTERNAL COMBUSTION ENGINE WITH DIRECT FUEL INJECTION
DE3904760A1 (en) * 1988-02-26 1989-10-05 Toyota Motor Co Ltd OTTO INTERNAL COMBUSTION ENGINE WITH DIRECT INJECTION
JPH02125911A (en) * 1988-11-04 1990-05-14 Toyota Motor Corp Cylinder direct injection internal combustion engine
US5335635A (en) * 1992-07-22 1994-08-09 Fuji Jukogyo Kabushiki Kaisha Combustion chamber for an internal combustion engine
EP0893584A3 (en) * 1997-07-25 1999-08-25 Mitsubishi Jidosha Kogyo Kabushiki Kaisha In-cylinder injection type spark ignition internal combustion engine
DE3943816C2 (en) * 1988-02-10 2001-01-25 Toyota Motor Co Ltd Direct-injection Otto-cycle engine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62191616A (en) * 1986-02-18 1987-08-22 Mazda Motor Corp Fuel injection type engine
DE3903842A1 (en) * 1988-02-10 1989-09-14 Toyota Motor Co Ltd OTTO INTERNAL COMBUSTION ENGINE WITH DIRECT FUEL INJECTION
US4958604A (en) * 1988-02-10 1990-09-25 Toyota Jidosha Kabushiki Kaisha Direct fuel injection type spark ignition internal combustion engine
DE3903842C2 (en) * 1988-02-10 1998-12-10 Toyota Motor Co Ltd Otto engine with direct fuel injection
DE3943816C2 (en) * 1988-02-10 2001-01-25 Toyota Motor Co Ltd Direct-injection Otto-cycle engine
DE3904760A1 (en) * 1988-02-26 1989-10-05 Toyota Motor Co Ltd OTTO INTERNAL COMBUSTION ENGINE WITH DIRECT INJECTION
US4920937A (en) * 1988-02-26 1990-05-01 Toyota Jidosha Kabushiki Kaisha Direct fuel injection type spark ignition internal combustion engine having a squish flow for assisting fuel evaporation
JPH02125911A (en) * 1988-11-04 1990-05-14 Toyota Motor Corp Cylinder direct injection internal combustion engine
US5335635A (en) * 1992-07-22 1994-08-09 Fuji Jukogyo Kabushiki Kaisha Combustion chamber for an internal combustion engine
EP0893584A3 (en) * 1997-07-25 1999-08-25 Mitsubishi Jidosha Kogyo Kabushiki Kaisha In-cylinder injection type spark ignition internal combustion engine
CN1083929C (en) * 1997-07-25 2002-05-01 三菱自动车工业株式会社 Cylinder internal spark injection igniting type internal combustion engine

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