JPH01211612A - 4-cycle engine with auxiliary combustion chamber - Google Patents
4-cycle engine with auxiliary combustion chamberInfo
- Publication number
- JPH01211612A JPH01211612A JP3537488A JP3537488A JPH01211612A JP H01211612 A JPH01211612 A JP H01211612A JP 3537488 A JP3537488 A JP 3537488A JP 3537488 A JP3537488 A JP 3537488A JP H01211612 A JPH01211612 A JP H01211612A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- umbrella
- auxiliary combustion
- valve
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 65
- 235000001674 Agaricus brunnescens Nutrition 0.000 abstract 4
- 239000011148 porous material Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 1
- 239000004927 clay Substances 0.000 description 1
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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、副燃焼室付ぎ四サイクルエンジンに関り−
る。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a four-stroke engine with a secondary combustion chamber.
Ru.
四サイクルエンジンは、燃焼室に通じる吸気孔及び排気
孔の端に傘型バルブを設け、クランク軸の回転に同期さ
けて、吸気用の傘型バルブが開いたとぎに吸気ガスを吸
入し、１ノ１気用の傘型バルブが開いたとぎに、燃焼し
た排気ガスを初出するようになつ′Ｃいる。燃焼室を含
むシリンダー内ぐの吸気ガスの点火燃焼の効率は、吸気
の乱れによる火炎の伝播速度が大きく影響し、吸気孔に
渦流れを作る部分を設けたりして、適度の吸気カスの乱
れを起して、燃焼効率゛を高めて出力増加を図るように
している。どころが、エンジンが中速以上で運転される
場合は、吸気ガスの流入速度が早く、適度の乱れを作る
ことかでき為が、低速で運転しているとぎは、吸気ガス
の流入速度が遅く、吸気孔などの形状選定では、吸気カ
スに適度の乱れを作ることができず、燃焼効率が悪くな
る。口のため、燃焼室に副燃焼室を設り、この副燃焼室
からの噴流で、吸気ガスに乱れを作ることが１３ねれ−
（ａ３す、口の副燃焼室は低速出力白土に有効である。A four-cycle engine has umbrella-shaped valves at the ends of the intake and exhaust holes leading to the combustion chamber, and intake gas is taken in when the intake umbrella-shaped valve opens in synchronization with the rotation of the crankshaft. As soon as the umbrella-shaped valve for the first air is opened, the combusted exhaust gas begins to be released. The efficiency of ignition and combustion of intake gas inside the cylinder, including the combustion chamber, is greatly influenced by the flame propagation speed caused by turbulence in the intake air. The aim is to raise combustion efficiency and increase output. However, when the engine is operated at medium speed or above, the intake gas flows in at a high speed and can create a moderate amount of turbulence, but when the engine is operated at low speeds, the intake gas flows at a slow speed. When selecting the shape of the intake hole, etc., it is not possible to create appropriate turbulence in the intake scum, resulting in poor combustion efficiency. For this purpose, an auxiliary combustion chamber is installed in the combustion chamber, and the jet flow from this auxiliary combustion chamber creates turbulence in the intake gas.
(A3, the auxiliary combustion chamber at the mouth is effective for low-speed output white clay.
。
一般に、副燃焼室を設りる場合（、Ｌ、第４図及び第５
図に示すＪ：うに、シリンターヘットＡの燃焼室Ｂに扶
りＣを設Ｇプて、副燃焼輩りを圧入し、小孔１三で、副
燃焼室りと燃焼室Ｂを通じさせである。. Generally, when installing an auxiliary combustion chamber (L, Figures 4 and 5)
J: As shown in the figure, install a support C in the combustion chamber B of the cylinder head A, press fit the auxiliary combustion chamber, and make the auxiliary combustion chamber and the combustion chamber B communicate through the small hole 13. be.
このようにすると、シリンダーヘッドＡ（７）燃焼室Ｂ
に通じる部分に副燃焼室ｌ〕を取付ける容積が必要にな
り、燃焼室Ｂ内の吸気弁Ｆ、排気弁Ｇ、点火栓１−１の
配置は、第５図に示すようになる。例えば、実開昭５７
−１２７８１９号公報参照。ところで、最近は、吸気効
率及び排気効率を高めて、高回転高出力を得るために、
吸気孔の開口面積及び排気孔の開口面積を大きくするた
め、二つの吸気弁と二つの排気弁を有する四弁型エンジ
ンが採用されるようになっている。この場合には、燃焼
室壁の大部分を弁がしめることになり、副燃焼室を設け
るのが困難である。In this way, cylinder head A (7), combustion chamber B
A volume is required to mount the auxiliary combustion chamber (L) in the portion leading to the combustion chamber B, and the arrangement of the intake valve F, exhaust valve G, and spark plug 1-1 in the combustion chamber B is as shown in FIG. For example,
See Publication No.-127819. By the way, recently, in order to increase intake efficiency and exhaust efficiency and obtain high rotation and high output,
In order to increase the opening area of the intake hole and the opening area of the exhaust hole, four-valve engines having two intake valves and two exhaust valves are now being used. In this case, most of the wall of the combustion chamber is closed by the valve, making it difficult to provide an auxiliary combustion chamber.
この発明は、多弁型の四サイクルエンジンで、傘型バル
ブの傘部分に副燃焼室を設けて、燃焼室の場所をとるこ
とがなく、多弁型の四サイクルエンジンにも副燃焼室が
できて、シリンダーヘッドが簡単にでき、低速時の出力
の向上が図れる副燃焼室付き四ザイクルエンジンを得る
ことを目的とする。This invention is a multi-valve type four-stroke engine, in which a sub-combustion chamber is provided in the umbrella part of the umbrella-shaped valve, so that the combustion chamber does not take up space, and a multi-valve type four-cycle engine can also have a sub-combustion chamber. The purpose of the present invention is to obtain a four-cycle engine with an auxiliary combustion chamber whose cylinder head can be easily made and whose output can be improved at low speeds.
以下、本発明を図面に示す実施例にＪ−って説明する。 Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.
図は四弁型四４」イクル］−ンジンの場合を示し、シリ
ンダーヘッド１の一方に先端が二股に分れた吸気孔２が
設けられ、燃焼室３の端に吸気孔２を開閉する二つの傘
型バルブ４が設りである。又、他方には、先端が二股に
分れた排気孔５が設けられ、燃焼室３の端に排気孔５を
開閉Ｊ°る二つの傘型バルブ６が設けである１、燃焼室
３の中央には点火栓７が配置しである。吸気用の傘型バ
ルブ４ど排気用の傘型バルブ６は、クランクシャフトに
連動して回転するカムシャフト８のカム９，１０で、ロ
ッカーアーム１１．１２を介し−（押下げて聞くように
なっている。しかして、本発明は、傘型バルブ４の傘部
分１３を内側に挾って塞ぎ板１７！Ｉを固着して、副燃
焼室１５を設４．Ｊ、塞き゛板１４に小孔１６を設り（
，１ｉｉｌＩ燃焼室１５と燃焼室３を小孔１６で連通さ
ぜる。尚、図では、一つの傘型バルブ４に副燃焼室１５
を設けであるが、傘型バルブ４．６の複数に設けてもよ
い。The figure shows the case of a four-valve engine, in which an intake hole 2 with a bifurcated tip is provided on one side of the cylinder head 1, and two holes are provided at the end of the combustion chamber 3 to open and close the intake hole 2. Two umbrella-shaped valves 4 are provided. The other side is provided with an exhaust hole 5 whose tip is split into two, and two umbrella-shaped valves 6 are provided at the ends of the combustion chamber 3 to open and close the exhaust hole 5. A spark plug 7 is placed in the center. The umbrella-shaped valve 4 for intake and the umbrella-shaped valve 6 for exhaust are connected via rocker arms 11 and 12 by cams 9 and 10 of a camshaft 8 that rotates in conjunction with the crankshaft. Therefore, in the present invention, the auxiliary combustion chamber 15 is established by sandwiching the umbrella portion 13 of the umbrella-shaped valve 4 inward and fixing the closing plate 17! Hole 16 is provided (
, 1iii The combustion chamber 15 and the combustion chamber 3 are communicated with each other through a small hole 16. In addition, in the figure, one umbrella-shaped valve 4 has an auxiliary combustion chamber 15.
However, a plurality of umbrella-shaped valves 4.6 may be provided.
副燃焼室１５は、傘型バルブ４，６に設けるので、シリ
ンダーヘッド１は通常の多弁型エンジンのものと同一で
よく、副燃焼室１５のために手を加える必要が全くなく
、簡単な構造にできる。又、副燃焼室１５の選択は、傘
型バルブ４．６の交換だりでできる。副燃焼室１５は、
吸気ガス流れが遅（、乱れができ難い低速時に噴流によ
って乱れを作り、火炎伝播速度を早めて燃焼効率を向上
し、出力の増加を図ることができる。又、副燃焼室１５
を傘型バルー４，６に内設したので、場所をとることが
なく、多弁型のエンジンにも副燃焼室１５を設けること
ができ、吸気効率及び排気効率のよい高回転高出力型の
エンジンにもできる。Since the auxiliary combustion chamber 15 is provided in the umbrella valves 4 and 6, the cylinder head 1 can be the same as that of a normal multi-valve engine, and there is no need to modify the auxiliary combustion chamber 15, resulting in a simple structure. Can be done. Further, the auxiliary combustion chamber 15 can be selected by replacing the umbrella valve 4.6. The sub-combustion chamber 15 is
At low speeds when the intake gas flow is slow (or when turbulence is difficult to form), turbulence is created by the jet flow, which increases the flame propagation speed, improves combustion efficiency, and increases output.
Since it is installed inside the umbrella-shaped valves 4 and 6, it does not take up much space, and the auxiliary combustion chamber 15 can be provided even in a multi-valve type engine, resulting in a high-speed, high-output type engine with good intake efficiency and exhaust efficiency. It can also be done.
以上説明したように、この発明は、シリンダーヘッドの
燃焼室に通じる吸気孔及び排気孔端に傘型バルブを設け
て開閉するものに於て、傘型バルブの傘部分の内側を袂
って副燃焼室を設け、この副燃焼室を小孔で燃焼室に連
通させるＪ：うにしたので、傘型バルブに場所をとらず
に副燃焼室かできて、シリンダーヘッドに細工を施すこ
とがなく、多弁型のエンジンにも使用できる。１又、傘
型バルブの交換だ１ノで副燃焼室付きエンジンにできる
。As explained above, the present invention provides an umbrella-shaped valve for opening and closing by providing an umbrella-shaped valve at the end of the intake hole and exhaust hole leading to the combustion chamber of the cylinder head, and the invention provides a sub-assembly by passing over the inside of the umbrella part of the umbrella-shaped valve. A combustion chamber is provided, and this auxiliary combustion chamber is communicated with the combustion chamber through a small hole.Since this is done, the auxiliary combustion chamber can be created without taking up space in the umbrella valve, and there is no need to modify the cylinder head. Can also be used in multi-valve engines. 1. Also, by replacing the umbrella valve, you can create an engine with an auxiliary combustion chamber.
そして、副燃焼室によって、低速時の燃焼効率を高めて
出力増加を図ることができ、多弁型エンジンによって、
高速高出力型エンジンの性能も得られる。The auxiliary combustion chamber increases combustion efficiency at low speeds and increases output, and the multi-valve engine
It also provides the performance of a high-speed, high-output engine.
第１図乃至第３図は本発明の一実施例を示し、第１図は
縦断面図、第２図は要部の拡大縦断面図、第３図は燃焼
室の内側面図、第４図及び第５図は従来例を示し、第４
図は縦断面図、第５図は燃焼室の内側面図である。
１・・・シリンダーヘッド、２・・・吸気孔、３・・・
燃焼室、４・・・傘型バルブ、５・・・排気孔、６・・
・傘型バルブ、１３・・・傘部分、１５・・・副燃焼室
、１６・・・小孔。1 to 3 show one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged longitudinal sectional view of main parts, FIG. 3 is an internal side view of the combustion chamber, and FIG. Figures 5 and 5 show conventional examples;
The figure is a longitudinal sectional view, and FIG. 5 is an inner side view of the combustion chamber. 1... Cylinder head, 2... Intake hole, 3...
Combustion chamber, 4... umbrella valve, 5... exhaust hole, 6...
・Umbrella-shaped valve, 13...umbrella part, 15...auxiliary combustion chamber, 16...small hole.
Claims (1)
に傘型バルブを設けて開閉するものに於て、傘型バルブ
の傘部分の内側を抉つて副燃焼室を設け、この副燃焼室
を小孔で燃焼室に連通させるようにしたことを特徴する
副燃焼室付き四サイクルエンジン。In cylinder head valves that open and close by providing umbrella-shaped valves at the ends of the intake and exhaust holes leading to the combustion chamber, the inside of the umbrella part of the umbrella-shaped valve is gouged out to create a sub-combustion chamber, and this sub-combustion chamber is made smaller. A four-cycle engine with an auxiliary combustion chamber that communicates with the combustion chamber through a hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3537488A JPH01211612A (en) | 1988-02-19 | 1988-02-19 | 4-cycle engine with auxiliary combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3537488A JPH01211612A (en) | 1988-02-19 | 1988-02-19 | 4-cycle engine with auxiliary combustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01211612A true JPH01211612A (en) | 1989-08-24 |
Family
ID=12440126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3537488A Pending JPH01211612A (en) | 1988-02-19 | 1988-02-19 | 4-cycle engine with auxiliary combustion chamber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01211612A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010144602A (en) * | 2008-12-18 | 2010-07-01 | Nissan Motor Co Ltd | Combustion chamber structure of engine |
| JP2012229698A (en) * | 2012-07-20 | 2012-11-22 | Nissan Motor Co Ltd | Engine combustion chamber structure |
-
1988
- 1988-02-19 JP JP3537488A patent/JPH01211612A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010144602A (en) * | 2008-12-18 | 2010-07-01 | Nissan Motor Co Ltd | Combustion chamber structure of engine |
| JP2012229698A (en) * | 2012-07-20 | 2012-11-22 | Nissan Motor Co Ltd | Engine combustion chamber structure |
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