JPH0517368B2 - - Google Patents
Info
- Publication number
- JPH0517368B2 JPH0517368B2 JP57167677A JP16767782A JPH0517368B2 JP H0517368 B2 JPH0517368 B2 JP H0517368B2 JP 57167677 A JP57167677 A JP 57167677A JP 16767782 A JP16767782 A JP 16767782A JP H0517368 B2 JPH0517368 B2 JP H0517368B2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- sub
- nozzle
- subchamber
- partition wall
- 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
- 238000005192 partition Methods 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 239000000446 fuel Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000000034 method Methods 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
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/14—Engines characterised by precombustion chambers with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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)
Description
【発明の詳細な説明】 本発明は副室式機関の燃焼室に関する。[Detailed description of the invention] The present invention relates to a combustion chamber of a subchamber type engine.
従来の副室式機関の副燃焼室（以下副室とよ
ぶ）を第１図に示す。図において、副室１はシリ
ンダヘツド４内に凹設されていて、その構造は上
部が半球型、下部は円錐台のものあるいは円柱型
のものの等があるが、同図では下部が円錐台のも
のを示す。副室１には、燃料噴射弁５及び機関開
始動時に副室１内を予熱するグロープラグ６を必
要に応じて設ける。副室１と、ピストン７の頂
面、シリンダ８、シリンダヘツド４の下面から構
成される主燃焼室（以下主室とよぶ）３とは、口
金９の底部の隔壁により区画され、同隔壁に穿設
された副室噴口２により連通している。同隔壁の
副室１側の端面、即ち副室底面９ａと主室３側の
端面とは副室中心線Ａ−Ａに直交し、副室底面９
ａと副室噴口２の軸心線とのなす最小角度をθ2と
し、主室側端面と副室噴口２の軸心線とのなす最
小角度をθ1とするとき、θ1＝θ2である。 FIG. 1 shows the subcombustion chamber (hereinafter referred to as subchamber) of a conventional subchamber type engine. In the figure, the auxiliary chamber 1 is recessed in the cylinder head 4, and its structure is such that the upper part is hemispherical and the lower part is truncated conical or cylindrical. show something The auxiliary chamber 1 is provided with a fuel injection valve 5 and a glow plug 6 for preheating the inside of the auxiliary chamber 1 when the engine is started, as necessary. The auxiliary chamber 1 and the main combustion chamber (hereinafter referred to as the main chamber) 3, which is composed of the top surface of the piston 7, the cylinder 8, and the bottom surface of the cylinder head 4, are separated by a partition wall at the bottom of the mouthpiece 9. It is communicated with by a pre-chamber nozzle 2 that is drilled therein. The end surface of the partition wall on the sub-chamber 1 side, that is, the sub-chamber bottom surface 9a, and the end surface on the main chamber 3 side are perpendicular to the sub-chamber center line A-A, and the sub-chamber bottom surface 9
When the minimum angle between a and the axis of the sub-chamber nozzle 2 is θ 2 , and the minimum angle between the main chamber side end face and the axis of the sub-chamber nozzle 2 is θ 1 , θ 1 = θ 2 It is.
機関運転時の圧縮行程で、ピストン７により主
室３内空気が圧縮され副室噴口２を経て、副室１
内に流入し、渦流Ｓを生成する。副室１に流入し
た空気と燃料噴射弁５から噴射される燃料との混
合はこの渦流により促進され、着火、燃焼する。
副室１内の既燃、未燃ガスは副室噴口２を通つ
て、主室３内に噴出し、ピストンに仕事をすると
同時に主室３内の空気との混合、燃焼を行わしめ
る。 During the compression stroke during engine operation, the air in the main chamber 3 is compressed by the piston 7, passes through the sub-chamber nozzle 2, and then flows into the sub-chamber 1.
flows into the interior, generating a vortex S. Mixing of the air flowing into the subchamber 1 and the fuel injected from the fuel injection valve 5 is promoted by this swirling flow, and ignition and combustion occur.
The burnt and unburned gases in the auxiliary chamber 1 are ejected into the main chamber 3 through the auxiliary chamber nozzle 2, and work on the piston, and at the same time mix with the air in the main chamber 3 and burn.
しかし上記のものには次の欠点がある。 However, the above method has the following drawbacks.
排ガスのNOxを低減するために、燃料噴射時
期を遅らせると、副室１内で燃料噴霧が着火、燃
焼し始める時期にはピストン７が下降行程にある
ため、副室１内のガスは副室噴口２を通つて主室
３内に流出するため、副室１内の燃料は未燃分の
多いまま主室３内に流出する。この場合、低負荷
即ち燃料噴射量が少ない運転域であると、主室３
内では空気過大の状態しかも噴出ガスの温度レベ
ルが低いため、主室３内でも不完全燃焼をおこ
し、未燃炭化水素HC等の排出が増大する。ま
た、高負荷即ち燃料噴射量が多い運転域である
と、主室３内では空気不足の状態となり、不完全
燃焼をおこし、吐煙等が悪化する。 If the fuel injection timing is delayed in order to reduce NO Since the fuel in the auxiliary chamber 1 flows out into the main chamber 3 through the chamber nozzle 2, the fuel in the auxiliary chamber 1 flows out into the main chamber 3 with a large amount of unburned fuel remaining. In this case, if the load is low, that is, the operating range has a small amount of fuel injection, the main chamber 3
Since there is an excessive amount of air inside the main chamber 3 and the temperature level of the ejected gas is low, incomplete combustion also occurs within the main chamber 3, increasing the emissions of unburned hydrocarbons HC and the like. Furthermore, if the engine is in a high load operation range, that is, a large amount of fuel injection, there will be a lack of air in the main chamber 3, causing incomplete combustion and worsening smoke emissions.
副室１内で着火する時期に副室１から主室３へ
のガス流出を抑制するために、副室噴口角度θ2
（＝θ1）を縮少すると、副室噴口２が副室口金９
からはみ出し構成できなくなるか、あるいは副室
１内の渦流旋回半径rsが確保できない。前者の副
室噴口２のはみ出しは渦流旋回半径rsを確保する
場合に生じ、シリンダヘツド構造上許容できな
い。後者は前者の欠点をカバーするために副室噴
口２の位置をシリンダ中心線Ｂ−Ｂから遠ざけた
場合に生じ、渦流旋回半径rsが過大になり、副室
１内で良好な渦流が得られず燃焼が悪化する。 In order to suppress gas outflow from the sub-chamber 1 to the main chamber 3 at the time of ignition in the sub-chamber 1, the sub-chamber nozzle angle θ 2
(=θ 1 ), the subchamber nozzle 2 becomes the subchamber nozzle 9.
Otherwise, the swirling radius r s of the vortex flow inside the auxiliary chamber 1 cannot be ensured. The former protrusion of the pre-chamber nozzle 2 occurs when the swirling radius r s of the vortex flow is secured, and is not permissible due to the structure of the cylinder head. The latter occurs when the position of the pre-chamber nozzle 2 is moved away from the cylinder center line B-B in order to compensate for the drawback of the former, and the vortex swirl radius r s becomes excessive, making it difficult to obtain a good vortex in the pre-chamber 1. combustion will worsen.
本発明の目的は上記の点に着目し、燃料噴射時
期を遅らせてNOx低減を図る場合に生ずる不完
全燃焼を防止できる燃焼室を提供することであ
り、その特徴とするところは、主室と副室とを区
画する隔壁に穿設され上記主室と副室とを連通す
る副室噴口を有し、同副室噴口の軸心線が直線状
であると共に、同隔壁の副室側端面が平面である
副室式内燃機関において、上記副室噴口の軸心線
と上記隔壁の副室側端面とのなす最小角度をθ2で
表わし、上記副室噴口の軸心線と上記隔壁の主室
側端面とのなす最小角度をθ1とするとき、上記隔
壁の副室側端面の全体を傾斜させてθ2＜θ1とした
ことである。 The purpose of the present invention is to focus on the above points, and to provide a combustion chamber that can prevent incomplete combustion that occurs when reducing NO x by delaying fuel injection timing. It has a subchamber nozzle that is bored in the partition wall that separates the main chamber and the subchamber and communicates the main chamber and the subchamber, and the axis of the subchamber nozzle is straight, and the subchamber side of the partition is In a pre-chamber internal combustion engine whose end face is flat, the minimum angle between the axial line of the pre-chamber nozzle and the pre-chamber side end face of the partition wall is represented by θ 2 , When the minimum angle between the partition wall and the main chamber side end surface is θ 1 , the entire sub chamber side end surface of the partition wall is inclined so that θ 2 <θ 1 .
以下図面を参照して本発明による実施例につき
説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第２図は本発明による１実施例の副室を示す断
面図である。 FIG. 2 is a sectional view showing an auxiliary chamber of one embodiment of the present invention.
図において、１は副室、２は副室噴口、３は主
室、４はシリンダヘツド、５は燃料噴射弁、６は
グロープラグ、７はピストン、８はシリンダであ
る。 In the figure, 1 is a subchamber, 2 is a subchamber nozzle, 3 is a main chamber, 4 is a cylinder head, 5 is a fuel injection valve, 6 is a glow plug, 7 is a piston, and 8 is a cylinder.
副室噴口２は副室１と主室３との間の隔壁を貫
通して両室１，３を連通しており、同副室噴口の
軸心線は直線状である。 The auxiliary chamber nozzle 2 passes through the partition wall between the auxiliary chamber 1 and the main chamber 3 to communicate the two chambers 1 and 3, and the axis of the auxiliary chamber nozzle is straight.
副室１は上部構造が半球型で、上記隔壁の副室
側端面である副室底面１ａは、全体を図示のよう
に、隔壁の外方側を厚くして、傾斜させている。 The auxiliary chamber 1 has a hemispherical upper structure, and the auxiliary chamber bottom surface 1a, which is the end surface of the partition wall on the side of the auxiliary chamber, is made thicker on the outer side of the partition wall and inclined as a whole, as shown in the figure.
即ち、副室噴口２の軸心線と副室底面１ａとの
なす最小角度をθ2とし、副室噴口２の軸心線と上
記隔壁の主室側端面とのなす最小角度をθ1とする
と、上記の傾斜によりθ2＜θ1に形成されている。 That is, the minimum angle between the axis of the sub-chamber nozzle 2 and the sub-chamber bottom surface 1a is θ 2 , and the minimum angle between the axis of the sub-chamber nozzle 2 and the end surface of the partition wall on the main chamber side is θ 1 . Then, due to the above-mentioned inclination, θ 2 <θ 1 is formed.
上記構成の場合の作用、効果について述べる。 The functions and effects of the above configuration will be described.
副室底面１ａを図示のように傾斜させると、
NOx低減上燃料噴射時期を遅らせピストン７が
下降行程にある時期に副室１内で着火しても、副
室１から主室３へのガスの流出が抑制されるため
に、副室１内での燃焼が促進され安定したものと
なる。その後、副室１内の圧力上昇により主室３
へガスが流出し、しかもこの時の噴出速度が早い
ので、主室３内の混合気形成、燃焼が促進され
る。 When the sub-chamber bottom 1a is tilted as shown,
In order to reduce NO The internal combustion is promoted and becomes stable. After that, due to the pressure increase in the subchamber 1, the main chamber 3
Since the gas flows out and the ejection speed at this time is high, the formation and combustion of the air-fuel mixture in the main chamber 3 are promoted.
上述のような本発明による場合は、機関の
NOx，HC，吐煙低減が実現できると共に、騒音
低減も実現できる。 In the case of the present invention as described above, the institution's
It is possible to reduce NO x , HC, and smoke emissions, as well as reduce noise.
第１図は従来の副室式機関の副室を示す断面
図、第２図は本発明による実施例の副室を示す断
面図である。
１……副室、２……副室噴口、３……主室、１
ａ，９ａ……副室底面。
FIG. 1 is a sectional view showing the subchamber of a conventional subchamber type engine, and FIG. 2 is a sectional view showing the subchamber of an embodiment according to the present invention. 1...Subchamber, 2...Subchamber nozzle, 3...Main chamber, 1
a, 9a...Bottom of subchamber.
Claims (1)
主室と副室とを連通する副室噴口を有し、同副室
噴口の軸心線が直線状であると共に、同隔壁の副
室側端面が平面である副室式内燃機関において、
上記副室噴口の軸心線と上記隔壁の副室側端面と
のなす最小角度をθ2で表わし、上記副室噴口の軸
心線と上記隔壁の主室側端面とのなす最小角度を
θ1とするとき、上記隔壁の副室側端面の全体を傾
斜させてθ2＜θ1としたことを特徴とする副室式機
関の燃焼室。1. A sub-chamber nozzle is provided in a partition wall that partitions the main chamber and the sub-chamber and communicates the main chamber and the sub-chamber, and the axis of the sub-chamber nozzle is straight, and In a pre-chamber internal combustion engine in which the pre-chamber side end face is flat,
The minimum angle between the axis of the sub-chamber nozzle and the end surface of the partition wall on the sub-chamber side is represented by θ 2 , and the minimum angle between the axis of the sub-chamber nozzle and the end surface of the partition wall on the main chamber side is expressed as θ 1 , a combustion chamber for a pre-chamber engine, characterized in that the entire pre-chamber side end face of the partition wall is inclined so that θ 2 <θ 1 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167677A JPS5958118A (en) | 1982-09-28 | 1982-09-28 | Combustion chamber for antechamber type engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167677A JPS5958118A (en) | 1982-09-28 | 1982-09-28 | Combustion chamber for antechamber type engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5958118A JPS5958118A (en) | 1984-04-03 |
| JPH0517368B2 true JPH0517368B2 (en) | 1993-03-09 |
Family
ID=15854169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57167677A Granted JPS5958118A (en) | 1982-09-28 | 1982-09-28 | Combustion chamber for antechamber type engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5958118A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60153420A (en) * | 1984-01-21 | 1985-08-12 | Mitsubishi Heavy Ind Ltd | Combustion chamber of double cell type engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57140516A (en) * | 1981-02-23 | 1982-08-31 | Mitsubishi Heavy Ind Ltd | Combustion chamber of swirl chamber type engines |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136131U (en) * | 1980-03-14 | 1981-10-15 |
-
1982
- 1982-09-28 JP JP57167677A patent/JPS5958118A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57140516A (en) * | 1981-02-23 | 1982-08-31 | Mitsubishi Heavy Ind Ltd | Combustion chamber of swirl chamber type engines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5958118A (en) | 1984-04-03 |
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