JP2546248Y2 - Combustion chamber of subchamber internal combustion engine - Google Patents
Combustion chamber of subchamber internal combustion engineInfo
- Publication number
- JP2546248Y2 JP2546248Y2 JP2143492U JP2143492U JP2546248Y2 JP 2546248 Y2 JP2546248 Y2 JP 2546248Y2 JP 2143492 U JP2143492 U JP 2143492U JP 2143492 U JP2143492 U JP 2143492U JP 2546248 Y2 JP2546248 Y2 JP 2546248Y2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- combustion chamber
- injection port
- sectional area
- 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 - Fee Related
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、副室式内燃機関の燃焼
室に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion chamber of a sub-chamber internal combustion engine.
【０００２】[0002]
【従来の技術】図４は従来の副室式内燃機関の燃焼室の
縦断面図である。主燃焼室１と副燃焼室２は、副室口金
８に穿設された通路断面積を同じくする複数個の副室噴
口３を介して連通している。シリンダヘッド４に配設さ
れた燃料噴射弁５から副燃焼室２内に噴射された燃料の
一部をその中で着火・燃焼させて圧力を高め、未燃燃料
とともに副室噴口３を通って主燃焼室に燃焼ガスを噴出
させる。ピストン６の頂部に凹設されたキャビティは燃
焼の主領域であり、その口径部は円形である。2. Description of the Related Art FIG. 4 is a longitudinal sectional view of a combustion chamber of a conventional sub-chamber internal combustion engine. The main combustion chamber 1 and the sub-combustion chamber 2 communicate with each other through a plurality of sub-chamber injection holes 3 formed in the sub-chamber base 8 and having the same passage sectional area. A part of the fuel injected into the sub-combustion chamber 2 from the fuel injection valve 5 disposed in the cylinder head 4 is ignited and burned therein to increase the pressure, and passes through the sub-chamber injection port 3 together with the unburned fuel. The combustion gas is jetted into the main combustion chamber. The cavity recessed at the top of the piston 6 is the main region for combustion, and its caliber is circular.
【０００３】[0003]
【考案が解決しようとする課題】副室式内燃機関の燃費
の向上、排気煙濃度の改善を図るうえで、従来の技術で
は、次のような問題点があった。即ち副室口金に設けら
れ、主燃焼室へ連通する複数個の副室噴口は、すべて管
状で、且つその口径寸法が同一である。このため、副室
噴口の口径を小さくすれば、未燃の燃料噴霧と燃焼ガス
の混合気の主燃焼室への噴出速度が上って噴流ペネトレ
ーションは増すが、混合気噴流の流体摩擦や副室噴口で
の絞り損失が大きくなるとともに、混合気が噴口から噴
出しにくくなり、主燃焼室内での混合気の形成及び燃焼
が遅れ燃費が増し排気煙濃度も上昇する傾向となる。ま
た、副室噴口面積の合計値を一定におさえて、噴口の数
を減らすとすれば、各噴口の口径寸法は大となり噴流ペ
ネトレーションは増すが、各噴口からの噴流の間隔が広
がるので空気利用率が低下し、燃焼状況が悪くなる。In order to improve the fuel efficiency of the sub-chamber internal combustion engine and to improve the exhaust smoke concentration, the conventional technique has the following problems. That is, the plurality of sub chamber injection ports provided in the sub chamber base and communicating with the main combustion chamber are all tubular and have the same diameter. For this reason, if the diameter of the sub chamber injection port is reduced, the jet velocity of the mixture of unburned fuel spray and combustion gas to the main combustion chamber increases, and the jet penetration increases. As the throttling loss at the chamber injection port increases, the air-fuel mixture becomes difficult to blow out from the injection port, and the formation and combustion of the air-fuel mixture in the main combustion chamber is delayed, fuel consumption increases, and the exhaust smoke concentration tends to increase. Also, if the total value of the sub-chamber nozzle area is kept constant and the number of nozzles is reduced, the diameter of each nozzle becomes large and the jet penetration increases, but the space between the jets from each nozzle increases, so the air The rate decreases and the combustion situation worsens.
【０００４】本考案の目的は、前記従来装置の問題点を
解消し、燃料消費率及び排気煙濃度の低減を、簡易な手
段で実現する副室式内燃機関の燃焼室を提供するにあ
る。An object of the present invention is to provide a combustion chamber of a sub-chamber internal combustion engine which solves the above-mentioned problems of the conventional apparatus and reduces the fuel consumption rate and the exhaust smoke concentration by simple means.
【０００５】[0005]
【課題を解決するための手段】本考案の副室式内燃機関
の燃焼室は、主燃焼室１と副燃焼室２とを連通する直管
で断面積がｆ1 ，ｆ2 （但しｆ1 ＞ｆ2 ）である偶数個
の副室噴口３を交互に配列した副室口金８と、前記副室
噴口３のうち大きい通路断面積ｆ1 を有する副室噴口の
軸線の延長線とピストン頂部のキャビティ側壁との交差
部に形成された凹曲面部とを有してなることを特徴とし
ている。The combustion chamber of the sub-chamber internal combustion engine of the present invention is a straight pipe communicating between the main combustion chamber 1 and the sub-combustion chamber 2 and has a cross-sectional area of f 1 , f 2 (where f 1). > F 2 ), a sub-chamber base 8 in which an even number of sub-chamber nozzles 3 are alternately arranged, an extension of the axis of the sub-chamber nozzle having a large passage cross-sectional area f 1 among the sub-chamber nozzles 3, and a piston top. And a concave curved surface portion formed at the intersection with the cavity side wall.
【０００６】[0006]
【作用】本考案では前記のような構造としたので次のよ
うに作用する。噴流ペネトレーションは噴流の運動量に
比例する。ここで（運動量）＝（質量）×（速度）＝
｛（面積）×（速度）×（密度）×（時間）｝×（速
度）副室噴口の総通路断面積を一定とすれば、通路断面
積がｆ1 ，ｆ2 （但しｆ1＞ｆ2 ）である各副室噴口で
の噴流速度は同じと考えることができる。従って、副室
噴口の総通路断面積が一定のもとでは、噴流ペネトレー
ションは各副室噴口の通路断面積に比例する。本考案に
よる燃焼室にすると、副燃焼室２の副室口金８の副室噴
口３から未燃燃料噴霧をともなって燃焼ガスが主燃焼室
１へ噴出するに際して、流路断面積ｆ1 の副室噴口によ
り噴流のペネトレーションを向上させ、流路断面積ｆ2
の副室噴口により、噴流と噴流の間の空気利用率の向上
を図ることができる。さらに、通路断面積ｆ1 の副室噴
口の軸線の延長線上のピストンキャビティ側壁に凹曲面
部９を形成したことにより、副室噴口からキャビティ側
壁までの距離が長くなったので、噴流ペネトレーション
の低下が抑制できるとともに、既燃ガス、燃料噴霧、空
気で構成される噴流中の燃料噴霧のキャビティ側壁への
付着が低減される。According to the present invention, the above-described structure operates as follows. Jet penetration is proportional to the momentum of the jet. Where (momentum) = (mass) x (velocity) =
{(Area) × (velocity) × (density) × (time)} × (velocity) Assuming that the total passage sectional area of the sub-chamber injection port is constant, the passage sectional areas are f 1 and f 2 (where f 1 > f). 2 ) It can be considered that the jet velocity at each sub-chamber outlet is the same. Therefore, when the total passage cross-sectional area of the sub-chamber injection port is constant, the jet penetration is proportional to the passage cross-sectional area of each sub-chamber injection port. With the combustion chamber according to the present invention, when the combustion gas is injected into the main combustion chamber 1 with the unburned fuel spray from the sub chamber injection port 3 of the sub chamber mouthpiece 8 of the sub combustion chamber 2, the sub section of the flow path cross section f 1 is reduced. The penetration of the jet is improved by the chamber orifice and the cross-sectional area of the flow path f 2
By using the sub chamber injection port, the air utilization rate between the jets can be improved. Further, by forming the concave portions 9 in the piston cavity side wall on an extension line of the axis of the auxiliary chamber injection port of the passage cross-sectional area f 1, the distance from the auxiliary chamber injection port to the cavity side wall is prolonged, decrease in jet penetration Can be suppressed, and the adhesion of the fuel spray in the jet composed of the burned gas, the fuel spray, and the air to the cavity side wall is reduced.
【０００７】[0007]
【実施例】図１に本考案の第１実施例に係る副室式内燃
機関の燃焼室の縦断面図を示す。図において、１は主燃
焼室、２は副燃焼室、３は副室噴口、４はシリンダヘッ
ド、５は燃料噴射弁、６はピストン、７はシリンダ、８
は副室口金、９はピストンキャビティ側壁の凹曲面部、
ｆ1 及びｆ2 は副室噴口の通路断面積（但しｆ1＞
ｆ2 ）である。副燃焼室２は副室口金８に穿設された副
室噴口３を介して、ピストン６の頂面、シリンダ７、シ
リンダヘッド４の下面で形成される主燃焼室１と連通し
ている。前記副室噴口３は偶数個あり、直管状に穿孔さ
れ、通路断面積ｆ1 の噴口とｆ2 の噴口とが交互に配列
されている。なお、大きい通路断面積ｆ1 を有する副室
噴口の軸線の延長線とピストンキャビティ側壁との交差
部に凹曲面の部分９が形成されている。1 is a longitudinal sectional view of a combustion chamber of a sub-chamber internal combustion engine according to a first embodiment of the present invention. In the figure, 1 is a main combustion chamber, 2 is a sub combustion chamber, 3 is a sub chamber injection port, 4 is a cylinder head, 5 is a fuel injection valve, 6 is a piston, 7 is a cylinder, 8
Is the sub-chamber base, 9 is the concave curved surface of the piston cavity side wall,
f 1 and f 2 cross-sectional area of the subchamber injection port (where f 1>
f 2 ). The auxiliary combustion chamber 2 communicates with the main combustion chamber 1 formed by the top surface of the piston 6, the cylinder 7, and the lower surface of the cylinder head 4 via the auxiliary chamber injection hole 3 formed in the auxiliary chamber base 8. The auxiliary chamber injection port 3 is an even number, are drilled in the straight tube, the injection port of the cross-sectional area f 1 of the injection port and f 2 are arranged alternately. The portion 9 of the concave surface is formed at the intersection of the extension and the piston cavity side wall of the axis of the auxiliary chamber injection port having a large passage cross-sectional area f 1.
【０００８】次にピストン上方から見たキャビティの形
状及び噴出噴流のパターンを示した図２を参照してこの
構成での作用について述べる。シリンダ７内に吸入され
た空気は、若干の残留ガスとともにピストン６で圧縮さ
れ、副室噴口３を経て副燃焼室２内に流入する。燃料噴
射弁５から副燃焼室２内に燃料を噴射すると、燃料噴霧
と空気が混合し、燃料噴霧の一部がその室内で着火・燃
焼して圧力が上昇し、未燃の燃料噴霧をともなって副室
噴口３から燃焼ガスが主燃焼室１へ噴出する。この噴出
の際の噴流のパターンを図２に示した。大きい通路断面
積ｆ1 の副室噴口により噴流のペネトレーションが向上
し、小さい通路断面積ｆ2 の副室噴口により、噴流と噴
流との間の空気利用率の向上を図ることができる。さら
に、大きい通路断面積ｆ1 の副室噴口の軸線の延長線と
ピストンキャビティ側壁との交差部に凹曲面部９が形成
されているので、副室噴口からピストンキャビティ側壁
までの距離が長くなり、噴流ペネトレーションの低下が
抑制できると共に、既燃ガス、燃料噴霧、空気で成り立
っている噴流中の燃料噴霧のピストンキャビティ側壁へ
の付着を低減できる。Next, the operation of this configuration will be described with reference to FIG. 2 showing the shape of the cavity and the pattern of the jet flow when viewed from above the piston. The air sucked into the cylinder 7 is compressed by the piston 6 together with some residual gas, and flows into the sub-combustion chamber 2 via the sub-chamber injection port 3. When the fuel is injected from the fuel injection valve 5 into the sub-combustion chamber 2, the fuel spray and the air mix, and a part of the fuel spray ignites and burns in the chamber, the pressure increases, and unburned fuel spray is generated. Thus, the combustion gas is injected from the sub chamber injection port 3 into the main combustion chamber 1. FIG. 2 shows the pattern of the jet at the time of this jet. Jet penetration is improved by a large cross-sectional area f 1 subchamber injection port, a small cross-sectional area f 2 of the auxiliary chamber injection port, it is possible to improve the air utilization rate between the jet and the jet. Further, since the concave surface portion 9 is formed at the intersection of the extension and the piston cavity side wall of the axis of the subchamber injection port large cross-sectional area f 1, the distance from the auxiliary chamber injection port until the piston cavity sidewall is long In addition, it is possible to suppress the drop of the jet penetration and to reduce the adhesion of the fuel spray in the jet composed of burned gas, fuel spray, and air to the side wall of the piston cavity.
【０００９】次に、本考案の第２実施例について、ピス
トンの上方から見たキャビティの形状及び噴出噴流のパ
ターンを図３に示して説明する。ピストンキャビティ側
壁に形成する凹曲面部９の位置を、図に見られるように
大きい通路断面積ｆ1 を有する副室噴口の軸線の延長線
上から、吸気スワールの旋回流方向に偏心させている。
このため、キャビティ側壁部で噴流がスワールの旋回流
に沿って流れるようになって、噴流の分散状況が良好と
なり、燃料噴霧と空気の混合、燃焼がさらに促進され
る。Next, a second embodiment of the present invention will be described with reference to FIG. 3 which shows the shape of the cavity and the pattern of the jet flow when viewed from above the piston. The position of the concave curved surface portion 9 formed on the side wall of the piston cavity is eccentric in the swirl flow direction of the intake swirl from an extension of the axis of the sub-chamber injection port having a large passage cross-sectional area f 1 as shown in the drawing.
For this reason, the jet flows along the swirl swirling flow at the cavity side wall, and the dispersion state of the jet is improved, and the mixing and combustion of the fuel spray and the air are further promoted.
【００１０】[0010]
【考案の効果】本考案は、前記のように構成されている
ので、次に記するような効果をもたらす。簡易な手段に
より、主燃焼室内での噴流ペネトレーションを向上し、
ピストンキャビティ側壁への燃料噴霧の付着を低減でき
るので、主燃焼室内における未燃燃料噴霧の均一な分散
を図り空気との混合を向上させ空気利用率を高めること
により良好な燃焼の促進が可能となる。この結果、燃料
消費率及び排気煙濃度を低減することができる。The present invention is configured as described above, and has the following effects. By simple means, improve the jet penetration in the main combustion chamber,
Since the adhesion of fuel spray to the side wall of the piston cavity can be reduced, uniform combustion of unburned fuel spray in the main combustion chamber is improved, mixing with air is improved, and good combustion can be promoted by increasing the air utilization rate. Become. As a result, the fuel consumption rate and the exhaust smoke concentration can be reduced.
【図１】本考案に係る副室式機関の燃焼室の縦断面図FIG. 1 is a longitudinal sectional view of a combustion chamber of a sub-chamber engine according to the present invention.
【図２】図１をピストン上方から見た場合のキャビティ
形状及び噴出噴流のパターンFIG. 2 is a diagram showing a cavity shape and a jet flow pattern when FIG. 1 is viewed from above a piston.
【図３】本考案の第２実施例に係るキャビティ形状及び
噴出噴流のパターンFIG. 3 shows a cavity shape and a jet flow pattern according to a second embodiment of the present invention.
【図４】従来の技術による副室式機関の燃焼室の縦断面
図FIG. 4 is a longitudinal sectional view of a combustion chamber of a sub-chamber engine according to the related art.
１…主燃焼室、２…副燃焼室、３…副室噴口、６…ピス
トン、８…副室口金、９…ピストンキャビティ側壁の凹
曲面部、ｆ1 ，ｆ2 …副室噴口の通路断面積（但しｆ1
＞ｆ2 ）。1 ... main combustion chamber, 2 ... auxiliary combustion chamber, 3 ... antechamber injection port, 6 ... Piston, 8 ... subchamber mouthpiece 9 ... concave surface portion of the piston cavity sidewalls, f 1, f 2 ... antechamber injection port of the passage cross-sectional Area (however, f 1
> F 2 ).
フロントページの続き (56)参考文献 実開 昭56−133924（ＪＰ，Ｕ) 実開 平４−6533（ＪＰ，Ｕ) 実開 平４−65924（ＪＰ，Ｕ) 実開 平４−116632（ＪＰ，Ｕ) 特公 昭15−3297（ＪＰ，Ｂ２)Continuation of the front page (56) References JP-A Sho 56-133924 (JP, U) JP-A 4-6533 (JP, U) JP-A 4-65924 (JP, U) JP-A 4-116632 (JP) , U) Tokiko 15-3297 (JP, B2)
Claims (1)
（１）と副燃焼室（２）とを連通する直管で断面積がｆ
1 ，ｆ2 （但しｆ1 ＞ｆ2 ）である偶数個の副室噴口
（３）を交互に配列した副室口金（８）と、前記副室噴
口（３）のうち大きい通路断面積ｆ1 を有する副室噴口
（３）の軸線の延長線とピストン（６）のキャビティ側
壁との交差部に形成された凹曲面部（９）とを有してな
る副室式内燃機関の燃焼室。In a sub-chamber internal combustion engine, a straight pipe communicating between a main combustion chamber (1) and a sub-combustion chamber (2) has a sectional area of f.
A sub-chamber mouthpiece (8) in which an even number of sub-chamber nozzles (3) satisfying 1 and f 2 (where f 1 > f 2 ) are alternately arranged, and a large passage cross-sectional area f of the sub-chamber nozzles (3) Combustion chamber of a sub-chamber internal combustion engine having a concave curved surface portion (9) formed at the intersection of the extension of the axis of the sub-chamber injection port (3) having the hole ( 1 ) and the cavity side wall of the piston (6). .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2143492U JP2546248Y2 (en) | 1992-03-11 | 1992-03-11 | Combustion chamber of subchamber internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2143492U JP2546248Y2 (en) | 1992-03-11 | 1992-03-11 | Combustion chamber of subchamber internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0573233U JPH0573233U (en) | 1993-10-08 |
| JP2546248Y2 true JP2546248Y2 (en) | 1997-08-27 |
Family
ID=12054876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2143492U Expired - Fee Related JP2546248Y2 (en) | 1992-03-11 | 1992-03-11 | Combustion chamber of subchamber internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2546248Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001227344A (en) * | 2000-02-14 | 2001-08-24 | Mitsubishi Heavy Ind Ltd | Nozzle hole structure of torch ignition-type gas engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6655724B2 (en) * | 2016-08-31 | 2020-02-26 | 日立オートモティブシステムズ株式会社 | Fuel injection device |
-
1992
- 1992-03-11 JP JP2143492U patent/JP2546248Y2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001227344A (en) * | 2000-02-14 | 2001-08-24 | Mitsubishi Heavy Ind Ltd | Nozzle hole structure of torch ignition-type gas engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0573233U (en) | 1993-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2546248Y2 (en) | Combustion chamber of subchamber internal combustion engine | |
| JP3332694B2 (en) | Combustion chamber of subchamber internal combustion engine | |
| JP2564396Y2 (en) | Combustion chamber of subchamber internal combustion engine | |
| JPH0630433U (en) | Gas engine torch ignition device | |
| JP2526324Y2 (en) | Torch ignition device for torch ignition type gas engine | |
| JPH0618035Y2 (en) | Combustion chamber of a sub-chamber internal combustion engine | |
| JPH0614033Y2 (en) | Combustion chamber of a sub-chamber internal combustion engine | |
| JPH08121171A (en) | Combustion chamber for direct injection type diesel engine | |
| WO2023181393A1 (en) | Engine | |
| JPH0619802Y2 (en) | Subchamber diesel engine combustion chamber | |
| JP3275470B2 (en) | Subchamber engine | |
| JPS6118186Y2 (en) | ||
| JPH0134657Y2 (en) | ||
| JPH0584365B2 (en) | ||
| JPH0143467Y2 (en) | ||
| JP2513233Y2 (en) | Combustion chamber of a sub-chamber internal combustion engine | |
| JPH06108850A (en) | Combustion chamber of auxiliary chamber type internal combustion engine | |
| JP2552579Y2 (en) | Combustion chamber of a swirl chamber type diesel engine | |
| JPS62288311A (en) | Pent roof type direct injection type internal combustion engine | |
| JP2971247B2 (en) | Combustion chamber of a swirl chamber type diesel engine | |
| JP3332719B2 (en) | Combustion chamber of subchamber internal combustion engine | |
| JP2716892B2 (en) | Combustion chamber of a swirl chamber type diesel engine | |
| JP2552558Y2 (en) | Combustion chamber of subchamber internal combustion engine | |
| JP2552596Y2 (en) | Combustion chamber of a swirl chamber type diesel engine | |
| JP2552578Y2 (en) | Combustion chamber of subchamber internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970408 |
|
| LAPS | Cancellation because of no payment of annual fees |