JP2700814B2 - Dome type sub-combustion chamber spark ignition engine - Google Patents
Dome type sub-combustion chamber spark ignition engineInfo
- Publication number
- JP2700814B2 JP2700814B2 JP1010652A JP1065289A JP2700814B2 JP 2700814 B2 JP2700814 B2 JP 2700814B2 JP 1010652 A JP1010652 A JP 1010652A JP 1065289 A JP1065289 A JP 1065289A JP 2700814 B2 JP2700814 B2 JP 2700814B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- sub
- spark ignition
- ignition engine
- cylinder
- 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
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、ドーム形副燃焼室を有する火花点火エンジ
ンに関する。Description: TECHNICAL FIELD The present invention relates to a spark ignition engine having a dome-shaped auxiliary combustion chamber.
＜背景＞ このドーム形副燃焼室式火花点火エンジンは、シリン
ダヘッドを副室式ディーゼルエンジンのシリンダヘッド
と共通部品にして、安価に製造できる点で有利である。<Background> The dome-shaped sub-combustion-chamber spark ignition engine is advantageous in that the cylinder head is made common with the cylinder head of the sub-chamber diesel engine and can be manufactured at low cost.
このシリンダヘッドの共通化が行える理由は、共通の
シリンダヘッドのドーム形の副室形成凹部から、ディー
ゼルエンジンの副室と火花点火エンジンの副燃焼室とを
造り分けることができることによる。The reason why the cylinder head can be shared is that the sub-chamber of the diesel engine and the sub-combustion chamber of the spark ignition engine can be formed separately from the dome-shaped sub-chamber forming recess of the common cylinder head.
この形式の火花点火エンジンの副燃焼室は、上記ディ
ーゼルエンジンの副室と造り分けができるようにするた
めに、その容積をあまり大きくすることができない。こ
のため、ピストンヘッドに大容積の主燃焼室を形成する
ことが必要である。The auxiliary combustion chamber of a spark ignition engine of this type cannot be made so large in volume that it can be separately formed from the auxiliary chamber of the diesel engine. For this reason, it is necessary to form a large-volume main combustion chamber in the piston head.
以上のことから、この形式の火花点火エンジンの基本
的な構造は、例えば第１図又は第３図に示すようなる。From the above, the basic structure of this type of spark ignition engine is as shown in, for example, FIG. 1 or FIG.
即ち、シリンダヘッド１にドーム形の副燃焼室２をシ
リンダ室３の軸心Ｓから偏心する部分に臨ませて凹入形
成し、ピストンヘッド４に主燃焼室５を凹入形成し、副
燃焼室２に点火栓６を設けてなる。That is, the dome-shaped sub-combustion chamber 2 is formed in the cylinder head 1 so as to face a portion eccentric from the axis S of the cylinder chamber 3, and the main combustion chamber 5 is formed in the piston head 4 so as to be recessed. An ignition plug 6 is provided in the chamber 2.
＜従来技術＞ 従来では、上記基本構造において、主燃焼室５の形状
は、例えば第３図及び第４図に示すように、偏平な円筒
孔状に形成されている。そして、副燃焼室２に臨む位置
で主燃焼室５の周肉壁部に連通溝９が形成されている。<Prior Art> Conventionally, in the above basic structure, the shape of the main combustion chamber 5 is formed in a flat cylindrical hole shape, for example, as shown in FIG. 3 and FIG. A communication groove 9 is formed in the peripheral wall of the main combustion chamber 5 at a position facing the sub-combustion chamber 2.
＜発明が解決しようとする課題＞ しかし、上記従来技術では次の問題がある。<Problem to be Solved by the Invention> However, the above-described conventional technology has the following problem.
（イ）副燃焼室から噴出した火炎が主燃焼室の端部にま
で至る道程（火炎伝播路）が長く、ノックが起こり易い
ので、シリンダヘッドやピストンヘッドがノック時の衝
撃力により損傷し易く、またノック音が騒音の原因にな
る。(A) Since the flame (flame propagation path) from the sub-combustion chamber to the end of the main combustion chamber has a long path to reach the end of the main combustion chamber and knock easily occurs, the cylinder head and piston head are easily damaged by the impact force at the time of knock. Also, knocking noise causes noise.
（ロ）上述のように、ノックを起こし易いことから、燃
焼室の圧縮比を高くすることができない。しかも、主燃
焼室が浅くて広いため、圧縮時の混合気の流れ及び爆発
・膨張時の燃焼ガスの流れがスムーズでない。(B) As described above, since the knock is liable to occur, the compression ratio of the combustion chamber cannot be increased. In addition, since the main combustion chamber is shallow and wide, the flow of air-fuel mixture during compression and the flow of combustion gas during explosion and expansion are not smooth.
このため、燃焼室での燃焼性能が低く、熱効率が低く
なり易い。Therefore, the combustion performance in the combustion chamber is low, and the thermal efficiency is likely to be low.
本発明は、火炎伝播路を短くしてノックを起こしにく
くするとともに、熱効率を高めて燃焼性能を向上させる
ことを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to shorten the flame propagation path so as to make knock less likely to occur, and to improve thermal efficiency to improve combustion performance.
＜課題を解決するための手段＞ 本発明は、上記基本構造において、上記目的を達成す
るために、例えば、第１図に示すように、主燃焼室
（５）は縦断面形状をくさび形に形成し、そのくさび形
状は副燃焼室（２）に臨む位置で深くなり、ここからシ
リンダ軸心（Ｓ）側に向かって次第に浅くなる形に形成
し、浅くなった側の上端縁（Ｔ）は副燃焼室（２）側か
ら見てシリンダ軸心（Ｓ）よりも遠方に位置し、シリン
ダ軸心（Ｓ）〜上端縁（Ｔ）迄の距離L1と、上端縁
（Ｔ）〜副燃焼室（２）と反対側のピストン外周面迄の
距離L2との関係を、L1＜L2に設定する。<Means for Solving the Problems> According to the present invention, in the above-described basic structure, in order to achieve the above object, for example, as shown in FIG. The wedge shape becomes deeper at a position facing the sub-combustion chamber (2), and is formed so as to gradually become shallower toward the cylinder axis (S) side, and the upper end edge (T) of the shallower side is formed. It is located farther than the cylinder axis (S) when viewed from the sub-combustion chamber (2) side, a distance L 1 up to the cylinder axis (S) ~ upper edge (T), the upper edge (T) ~ sub the relationship between the distance L 2 until the piston outer peripheral surface opposite to the combustion chamber (2) is set to L 1 <L 2.
＜作用＞ 主燃焼室（５）を上記のようなくさび形に形成し、シ
リンダ軸心（Ｓ）〜上端縁（Ｔ）迄の距離L1と、上端縁
（Ｔ）〜副燃焼室（２）と反対側のピストン外周面迄の
距離L2との関係を、L1＜L2に設定すると、スキッシュ面
を大きくできるので、その分、圧縮時において、スキッ
シュ空間から吐出される混合気の直進性を高めることが
できる。また、その速度を大きくできる。<Action> main combustion chamber (5) formed in the wedge-shaped as described above, the distance L 1 up to the cylinder axis (S) ~ upper edge (T), the upper edge (T) ~ auxiliary combustion chamber (2 ) and the relationship between the distance L 2 until the piston outer peripheral surface of the opposite side is set to L 1 <L 2, since the squish surface can be increased, correspondingly, at the time of compression, the gas mixture discharged from the squish space Straightness can be improved. Further, the speed can be increased.
そして、この混合気は、主燃焼室（５）の浅くなった
側の傾斜面（5a）の案内作用により、速度エネルギを減
じられることなく速やかに副燃焼室（２）側に流入し、
続いて浅くなった側の傾斜面（5b）の案内作用により副
燃焼室（２）内にスムーズに流入する。The air-fuel mixture quickly flows into the sub-combustion chamber (2) without reducing the velocity energy by the guiding action of the inclined surface (5a) on the shallow side of the main combustion chamber (5),
Subsequently, the fluid smoothly flows into the sub-combustion chamber (2) by the guiding action of the inclined surface (5b) on the shallower side.
このため、主燃焼室（５）の内壁に吸気の一部が衝突
して、滞留したりすることがないので、副燃焼室（２）
内における混合気の濃度を高めることができる。即ち、
点火栓（６）の近傍の混合気の濃度を高めることができ
る。For this reason, since part of the intake air does not collide with the inner wall of the main combustion chamber (5) and stay there, the auxiliary combustion chamber (2)
The concentration of the air-fuel mixture in the interior can be increased. That is,
The concentration of the air-fuel mixture near the ignition plug (6) can be increased.
主燃焼室（５）のうち副燃焼室（２）に臨む部分を深
く形成して、主燃焼室（２）に必要な容積を確保しなが
らも主燃焼室（５）の端部を副燃焼室（２）に近付けら
れるようにしたので、その分、火炎伝播距離を短くでき
る。A portion of the main combustion chamber (5) facing the sub-combustion chamber (2) is formed deep, and the end of the main combustion chamber (5) is sub-combusted while securing a necessary volume for the main combustion chamber (2). Since it is made to approach the chamber (2), the flame propagation distance can be shortened accordingly.
また、爆発・膨張時に、燃焼ガスが副燃焼室（２）か
ら主燃焼室（５）に流入する時には、主燃焼室（５）の
うち副燃焼室（２）に臨む部分で速やかに、スムーズに
案内されながら、傾斜面（5a）に沿ってシリンダ軸心
（Ｓ）側にスムーズに流れる。Also, when the combustion gas flows from the sub-combustion chamber (2) into the main combustion chamber (5) during the explosion / expansion, the portion of the main combustion chamber (5) facing the sub-combustion chamber (2) quickly and smoothly. While flowing along the inclined surface (5a), flows smoothly toward the cylinder axis (S).
＜発明の効果＞ 本発明では以下の効果を奏することができる。<Effects of the Invention> The present invention has the following effects.
イ．副燃焼室内における混合気の濃度を高めることがで
きるので、点火栓による発火ミスをなくせ、また、火炎
の伝播速度を速くできるので、燃焼性能を向上できる。
従って、燃費を向上できる。I. Since the concentration of the air-fuel mixture in the sub-combustion chamber can be increased, ignition mistakes caused by the spark plug can be eliminated, and the flame propagation speed can be increased, so that the combustion performance can be improved.
Therefore, fuel efficiency can be improved.
ロ．火炎伝播距離を短くできるので、その分、ガソリン
ノックを抑制できる。このため、シリンダヘッドやピス
トンヘッドが損傷しにくくなるので、その寿命を向上で
きる。また、ノック音に起因する騒音を低減できる。B. Since the flame propagation distance can be shortened, gasoline knock can be suppressed accordingly. Therefore, the cylinder head and the piston head are less likely to be damaged, and the life thereof can be improved. Further, noise due to knocking noise can be reduced.
ハ．上述のように、ガソリンノックを起こしにくいこと
から、燃焼室の圧縮比を高くすることができる。しか
も、圧縮時の混合気の流れ及び爆発・膨張時の燃焼ガス
の流れがスムーズである。C. As described above, since gasoline knock is unlikely to occur, the compression ratio of the combustion chamber can be increased. In addition, the flow of the air-fuel mixture during compression and the flow of combustion gas during explosion and expansion are smooth.
このため、燃焼室での燃焼性能が向上し、熱効率を高
めることができる。Therefore, the combustion performance in the combustion chamber is improved, and the thermal efficiency can be improved.
＜実施例＞ 次に、本発明の実施例を第１図及び第２図に基づき説
明する。<Example> Next, an example of the present invention will be described with reference to FIGS.
本実施例のシリンダヘッド１はディーゼルエンジン用
としても、火花点火エンジン（ガソリンエンジン、ガス
エンジン等）用としても兼用可能であり、ディーゼルエ
ンジンとして用いる場合にはシリンダ室３の軸心Ｓから
偏心する部分に臨ませて位置させた副室２に口金用の組
付け面を加工し、連通路をシリンダ軸心Ｓ側に向けて形
成した口金を上記組付け面に組付ける。The cylinder head 1 of this embodiment can be used for both a diesel engine and a spark ignition engine (gasoline engine, gas engine, etc.). When used as a diesel engine, it is eccentric from the axis S of the cylinder chamber 3. A mounting surface for a base is machined in the sub-chamber 2 positioned so as to face the portion, and a base formed with the communication path toward the cylinder axis S is mounted on the mounting surface.
また、火花点火エンジンとして用いる場合には副燃焼
室２に点火栓６を設けるとともに、例えば第１図に示す
ように、副燃焼室２をシリンダ軸心Ｓ側に向かう傾斜状
に加工する。When used as a spark ignition engine, an ignition plug 6 is provided in the sub-combustion chamber 2 and, at the same time, the sub-combustion chamber 2 is machined so as to be inclined toward the cylinder axis S, for example, as shown in FIG.
ピストンヘッド４には主燃焼室５がくさび形に凹入形
成されている。このくさび形状は副燃焼室２に臨む位置
では深く、ここからシリンダ軸心Ｓ側に向って次第に浅
くなる形状になっている。A main combustion chamber 5 is formed in the piston head 4 in a wedge-shaped recess. The wedge shape is deep at a position facing the sub-combustion chamber 2 and gradually becomes shallower from here toward the cylinder axis S side.
第１図及び第２図は本発明の実施例を示し、第１図はシ
リンダヘッドとピストンヘッドの要部縦断面図、第２図
はピストンヘッドの要部斜視図であり、第３図及び第４
図は従来例を示し、第３図は第１図相当図、第４図は第
２図相当図である。 １……シリンダヘッド、２……副燃焼室、３……シリン
ダ室、４……ピストンヘッド、５……主燃焼室、６……
点火栓、Ｓ……３の軸心。1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a cylinder head and a piston head, and FIG. 2 is a perspective view of a main part of a piston head. 4th
FIG. 3 shows a conventional example, FIG. 3 is a diagram corresponding to FIG. 1, and FIG. 4 is a diagram corresponding to FIG. 1 ... Cylinder head, 2 ... Sub combustion chamber, 3 ... Cylinder chamber, 4 ... Piston head, 5 ... Main combustion chamber, 6 ...
Spark plug, S ... 3 axis.
フロントページの続き (56)参考文献 特開 昭52−147205（ＪＰ，Ａ) 実開 昭61−63437（ＪＰ，Ｕ) 実開 昭61−76114（ＪＰ，Ｕ) 実開 昭63−4329（ＪＰ，Ｕ) 実開 平１−125820（ＪＰ，Ｕ) 実公 昭50−7382（ＪＰ，Ｙ２)Continuation of front page (56) References JP-A-52-147205 (JP, A) JP-A-61-63437 (JP, U) JP-A-61-76114 (JP, U) JP-A-63-4329 (JP) , U) Japanese Utility Model 1-125820 (JP, U) Japanese Utility Model 50-7382 (JP, Y2)
Claims (1)
室（２）をシリンダ室（３）の軸心（Ｓ）から偏心する
部分に臨ませて凹入形成し、ピストンヘッド（４）に主
燃焼室（５）を凹入形成し、副燃焼室（２）に点火栓
（６）を設けてなるドーム形副燃焼室式火花点火エンジ
ンにおいて、 主燃焼室（５）は縦断面形状をくさび形に形成し、 そのくさび形状は副燃焼室（２）に臨む位置で深くな
り、ここからシリンダ軸心（Ｓ）側に向って次第に浅く
なる形に形成し、 浅くなった側の上端縁（Ｔ）は副燃焼室（２）側から見
てシリンダ軸心（Ｓ）よりも遠方に位置し、 シリンダ軸心（Ｓ）〜上端縁（Ｔ）迄の距離L1と、上端
縁（Ｔ）〜副燃焼室（２）と反対側のピストン外周面迄
の距離L2との関係を、 L1＜L2に設定した事を特徴とするドーム形副燃焼室式火
花点火エンジン。A dome-shaped auxiliary combustion chamber (2) is formed in a cylinder head (1) so as to be recessed so as to face a portion eccentric from an axis (S) of a cylinder chamber (3). The main combustion chamber (5) has a longitudinal sectional shape in a dome-shaped sub-combustion chamber type spark ignition engine in which a main combustion chamber (5) is recessed and a spark plug (6) is provided in a sub-combustion chamber (2). Is formed in a wedge shape, and the wedge shape becomes deeper at a position facing the sub-combustion chamber (2), and gradually becomes shallower from here toward the cylinder axis (S), and the upper end of the shallower side is formed. edge (T) is located farther than the cylinder axis (S) when viewed from the sub-combustion chamber (2) side, a distance L 1 up to the cylinder axis (S) ~ upper edge (T), the upper edge ( de to T) ~ auxiliary combustion chamber the relationship between the distance L 2 until the piston outer peripheral surface of the opposite side (2), characterized in that set in L 1 <L 2 Domed auxiliary combustion chamber spark ignition engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1010652A JP2700814B2 (en) | 1989-01-18 | 1989-01-18 | Dome type sub-combustion chamber spark ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1010652A JP2700814B2 (en) | 1989-01-18 | 1989-01-18 | Dome type sub-combustion chamber spark ignition engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02191810A JPH02191810A (en) | 1990-07-27 |
| JP2700814B2 true JP2700814B2 (en) | 1998-01-21 |
Family
ID=11756154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1010652A Expired - Lifetime JP2700814B2 (en) | 1989-01-18 | 1989-01-18 | Dome type sub-combustion chamber spark ignition engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2700814B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS507382U (en) * | 1973-05-16 | 1975-01-25 | ||
| DE2624211A1 (en) * | 1976-05-29 | 1977-12-15 | Daimler Benz Ag | MIXED COMPRESSING COMBUSTION MACHINE |
| JPH0220423Y2 (en) * | 1984-09-29 | 1990-06-04 | ||
| JPH0511297Y2 (en) * | 1986-06-26 | 1993-03-19 |
-
1989
- 1989-01-18 JP JP1010652A patent/JP2700814B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02191810A (en) | 1990-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5351665A (en) | Internal combustion engine | |
| JPS5949407B2 (en) | Combustion chamber of internal combustion engine | |
| JP7388224B2 (en) | Internal combustion engine with prechamber | |
| US3923015A (en) | Combustion chamber of spark ignition internal combustion engine | |
| JPS6212370B2 (en) | ||
| JP2689132B2 (en) | Two-cycle diesel engine | |
| JPS58170820A (en) | Two cycle internal-combustion engine | |
| JPS6145044B2 (en) | ||
| JP2000248945A (en) | Cylinder direct injection engine | |
| JPS64576B2 (en) | ||
| JP2700814B2 (en) | Dome type sub-combustion chamber spark ignition engine | |
| US6701883B2 (en) | Cylinder head for use on a spark-ignition internal combustion engine and such spark-ignition internal combustion engine | |
| JPS5845572B2 (en) | Combustion chamber of internal combustion engine | |
| JP3037515B2 (en) | Two-point ignition engine | |
| JP3332694B2 (en) | Combustion chamber of subchamber internal combustion engine | |
| US6167864B1 (en) | Arrangement for spark-igniting direct-injection internal combustion engine | |
| JPS648170B2 (en) | ||
| US4329955A (en) | Combustion chamber of an internal combustion engine | |
| JP3389263B2 (en) | Spark ignition internal combustion engine | |
| US4532898A (en) | Fuel injection type internal combustion engine | |
| JP3212457B2 (en) | Combustion chamber of subchamber internal combustion engine | |
| KR100503818B1 (en) | Piston for medium and heavy duty spark ignition lean burn engine | |
| JPS633130B2 (en) | ||
| JPS6018586Y2 (en) | Sub-combustion chamber of sub-chamber diesel engine | |
| JP3080816B2 (en) | Combustion chamber of subchamber internal combustion engine |