JPH0573233U - Combustion chamber of sub-chamber internal combustion engine - Google Patents
Combustion chamber of sub-chamber internal combustion engineInfo
- Publication number
- JPH0573233U JPH0573233U JP2143492U JP2143492U JPH0573233U JP H0573233 U JPH0573233 U JP H0573233U JP 2143492 U JP2143492 U JP 2143492U JP 2143492 U JP2143492 U JP 2143492U JP H0573233 U JPH0573233 U JP H0573233U
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- combustion chamber
- sectional area
- combustion
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 57
- 239000000446 fuel Substances 0.000 abstract description 25
- 239000007921 spray Substances 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 5
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 230000035515 penetration Effects 0.000 description 9
- 239000000567 combustion gas Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
(57)【要約】
【目的】 本考案の目的は副室式内燃機関において、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て空気利用率を高め燃焼を促進さ
せ、燃料消費率及び排気煙濃度の低減が可能となる副室
式内燃機関の燃焼室を提供するにある。
【構成】 本考案の燃焼室は、主燃焼室１と副燃焼室２
とを連通する副室口金８に形状が直管でその断面積がｆ
1 ，ｆ2 （但しｆ1 ＞ｆ2 ）の偶数個の副室噴口３を交
互に配列し、該副室噴口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キャビティの
側壁との交差部に凹曲面部分９が形成されていることを
特徴とする。
(57) [Summary] [Objective] The purpose of the present invention is to achieve uniform distribution of unburned fuel spray in the main combustion chamber and improve mixing with air to improve the air utilization rate and combustion in a sub-chamber internal combustion engine. (EN) It is intended to provide a combustion chamber of an internal combustion engine of a sub-chamber type, which promotes the reduction of fuel consumption rate and exhaust smoke concentration. [Composition] The combustion chamber of the present invention comprises a main combustion chamber 1 and a sub combustion chamber 2.
The sub-chamber mouthpiece 8 communicating with and has a straight pipe shape and a cross-sectional area f
1 , f 2 (where f 1 > f 2 ) even number of sub-chamber nozzles 3 are arranged alternately, and the extension line of the axis of the sub-chamber nozzle having a large passage cross-sectional area f 1 and the piston A concave curved surface portion 9 is formed at the intersection with the side wall of the cavity.
Description
【０００１】[0001]
本考案は、副室式内燃機関の燃焼室に関する。 The present invention relates to a combustion chamber of a sub-chamber internal combustion engine.
【０００２】[0002]
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。 FIG. 4 is a vertical 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 are communicated with each other through a plurality of sub-chamber injection holes 3 formed in the sub-chamber mouthpiece 8 and having the same passage sectional area. A part of the fuel injected from the fuel injection valve 5 arranged in the cylinder head 4 into the sub-combustion chamber 2 is ignited and combusted in the sub-combustion chamber 2 to increase the pressure. To eject combustion gas into the main combustion chamber. The cavity recessed at the top of the piston 6 is the main area of combustion, and its bore is circular.
【０００３】[0003]
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 and the exhaust smoke concentration of the sub-chamber internal combustion engine, the conventional technology had the following problems. That is, the plurality of sub-chamber injection holes 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 nozzle diameter of the sub-chamber is made smaller, the jet speed of the mixture of unburned fuel spray and combustion gas to the main combustion chamber increases and jet penetration increases, but the fluid friction of the mixture jet and the auxiliary jet As the throttle loss at the chamber nozzle increases, the air-fuel mixture becomes less likely to eject from the nozzle, delaying the formation and combustion of the air-fuel mixture in the main combustion chamber, increasing fuel consumption and increasing exhaust smoke concentration. In addition, if the total number of nozzle openings in the sub chamber is kept constant and the number of nozzles is reduced, the diameter of each nozzle will be large and the jet penetration will increase. The rate will decrease and the combustion will worsen.
【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 solve the problems of the conventional device and to provide a combustion chamber of a sub-chamber type internal combustion engine which realizes reduction of fuel consumption rate and exhaust smoke concentration by a simple means.
【０００５】[0005]
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 that connects the main combustion chamber 1 and the sub-combustion chamber 2 and has an even number of cross-sections f 1 and f 2 (where f 1 > f 2 ). Sub-chamber mouthpieces 8 in which sub-chamber nozzles 3 are arranged alternately, and formed at the intersection of the extension line of the sub-chamber nozzle with a large passage cross-sectional area f 1 of the sub-chamber nozzles 3 and the cavity side wall at the top of the piston. It is characterized by having a concave curved surface portion.
【０００６】[0006]
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ｆ 1 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。 Since the present invention has the above-mentioned structure, it operates as follows. Jet penetration is proportional to the momentum of the jet. Here, (momentum) = (mass) x (velocity) = {(area) x (velocity) x (density) x (time)} x (velocity) If the total passage cross-sectional area of the sub-chamber nozzle is constant, The cross section is f1, F2(However, f1 > F2), The jet velocity at each sub-chamber jet can be considered to be the same. Therefore, under the condition that the total passage cross-sectional area of the sub chamber nozzle is constant, the jet penetration is proportional to the passage cross sectional area of each sub chamber nozzle. In the combustion chamber according to the present invention, when the combustion gas is ejected from the auxiliary chamber injection port 3 of the auxiliary chamber cap 8 of the auxiliary combustion chamber 2 into the main combustion chamber 1 along with the unburned fuel spray, the flow passage cross-sectional area f 1 The sub-chamber injection port improves the penetration of the jet flow,2The sub-compartment nozzle can improve the air utilization ratio between the jets. Furthermore, the passage cross-sectional area f1By forming the concave curved surface part 9 on the piston cavity side wall on the extension line of the axis of the sub chamber injection port, the distance from the sub chamber injection port to the cavity side wall becomes longer, so that the decrease in jet penetration can be suppressed and Adhesion of fuel spray in the jet consisting of fuel gas, fuel spray, and air to the cavity sidewall is reduced.
【０００７】[0007]
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ｆ 2 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。 FIG. 1 is a vertical 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 a sub chamber base, and 9 is a piston. Concave side wall of cavity side wall, f1And f2Is the cross-sectional area of the sub-chamber nozzle (however, f1 > F2). The sub-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 sub-chamber injection hole 3 formed in the sub-chamber mouthpiece 8. There are even number of the sub-chamber nozzles 3, which are perforated in a straight pipe shape and have a passage cross-sectional area f.1Nozzle and f 2 And the nozzles are arranged alternately. In addition, a large passage cross-sectional area f1A concave curved surface portion 9 is formed at the intersection of the extension line of the axis of the sub chamber injection port having the and the piston cavity side wall.
【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, which shows 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 through the sub chamber injection port 3. When fuel is injected from the fuel injection valve 5 into the sub-combustion chamber 2, the fuel spray and the air are mixed, and a part of the fuel spray is ignited and burned in the chamber to increase the pressure, accompanied by unburned fuel spray. As a result, combustion gas is ejected from the auxiliary chamber injection port 3 into the main combustion chamber 1. The jet pattern at the time of this jet is shown in FIG. The penetration of the jet flow is improved by the sub-chamber nozzle with the large passage sectional area f 1 , and the air utilization ratio between the jet flows can be improved by the sub-chamber nozzle with the small passage sectional area f 2 . Further, since the concave curved surface portion 9 is formed at the intersection of the extension line of the auxiliary chamber nozzle with the large passage sectional area f 1 and the piston cavity side wall, the distance from the auxiliary chamber nozzle to the piston cavity side wall is long. As a result, it is possible to suppress the decrease in jet penetration and also to reduce the adhesion of fuel spray in the jet, which consists of burnt gas, fuel spray, and air, to the sidewall 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 showing the shape of the cavity and the jet flow pattern as seen from above the piston. The position of the concave curved surface portion 9 formed on the side wall of the piston cavity is decentered in the swirl flow direction of the intake swirl from the extension of the axis line of the auxiliary chamber nozzle having the large passage sectional area f 1 as shown in the figure. There is. For this reason, the jet flows along the swirl swirl flow on the side wall of the cavity, and the jet dispersion is improved, and the mixing and combustion of fuel spray and air are further promoted.
【００１０】[0010]
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。 Since the present invention is configured as described above, it has the following effects. By simple means, jet penetration in the main combustion chamber can be improved, and adhesion of fuel spray to the side wall of the piston cavity can be reduced, so that unburned fuel spray can be evenly dispersed in the main combustion chamber to improve mixing with air. As a result, better combustion can be promoted by increasing the air utilization rate. 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 subchamber 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 cavity shape and a jet flow pattern when FIG. 1 is viewed from above the 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 subchamber engine according to a conventional technique.
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 ).
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。1. In a sub-chamber internal combustion engine, a straight pipe connecting the main combustion chamber (1) and the sub-combustion chamber (2) has a cross-sectional area of f.
A sub-chamber mouthpiece (8) in which an even number of sub-chamber nozzles (3) of 1 , 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 subchamber internal combustion engine having a concave curved surface portion (9) formed at the intersection of the extension of the axis of the subchamber nozzle (3) having 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 true JPH0573233U (en) | 1993-10-08 |
| JP2546248Y2 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 |
|---|---|---|---|---|
| WO2018042910A1 (en) * | 2016-08-31 | 2018-03-08 | 日立オートモティブシステムズ株式会社 | Fuel injection device |
Families Citing this family (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 |
-
1992
- 1992-03-11 JP JP2143492U patent/JP2546248Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018042910A1 (en) * | 2016-08-31 | 2018-03-08 | 日立オートモティブシステムズ株式会社 | Fuel injection device |
| JPWO2018042910A1 (en) * | 2016-08-31 | 2019-03-14 | 日立オートモティブシステムズ株式会社 | Fuel injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2546248Y2 (en) | 1997-08-27 |
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