JPS62288314A - Combustion chamber structure of direct injection type internal combustion engine - Google Patents
Combustion chamber structure of direct injection type internal combustion engineInfo
- Publication number
- JPS62288314A JPS62288314A JP12907886A JP12907886A JPS62288314A JP S62288314 A JPS62288314 A JP S62288314A JP 12907886 A JP12907886 A JP 12907886A JP 12907886 A JP12907886 A JP 12907886A JP S62288314 A JPS62288314 A JP S62288314A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- chamber
- main
- communication
- fuel
- 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 104
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 25
- 239000003595 mist Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000157302 Bison bison athabascae Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009423 ventilation 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
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
［産業上の利用分野］
本発明はピストン頂部に主燃焼室とＩＷＪ燃焼室とを一
部連通して形成した、だるま形の燃焼室を右づる直噴式
内燃（１閏において、副燃焼室から主燃焼室への火炎伝
播性を高めた直噴式内燃機関の燃焼室構造に関する。[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a bell-shaped combustion chamber formed by partially communicating the main combustion chamber and the IWJ combustion chamber at the top of the piston. This article relates to the combustion chamber structure of a direct injection internal combustion engine that improves flame propagation from the auxiliary combustion chamber to the main combustion chamber.
［従来の技術］
従来、第６図ないし第７図に示すように、ピストン１の
頂部に主燃焼室２と副燃焼室３とを並設し、これらをバ
ンク部４の上部で連通した、だるま形の燃焼室（特願昭
５９−２１０５１９号）を有する内燃機関が提案されて
いる。[Prior Art] Conventionally, as shown in FIGS. 6 and 7, a main combustion chamber 2 and a sub-combustion chamber 3 were arranged side by side at the top of a piston 1, and these were communicated at the upper part of a bank part 4. An internal combustion engine having a potbell-shaped combustion chamber (Japanese Patent Application No. 59-210519) has been proposed.
内燃機関がアイドル・軽負荷時には噴射ノズル５の副噴
口から１Ｍ燃焼室３に副噴霧ｆのみが噴射され、燃焼は
副燃焼ｖ３で濃混合状態にて行なわれる。一方、中・高
負荷時には副噴霧「だけでなく噴射ノズル５の主噴口か
らの主噴霜［が主燃焼室２に噴射される。この場合、副
燃焼室３での燃焼による火炎すはバンク部４の壁を越え
て主燃焼室２に伝えられる。When the internal combustion engine is idle and under a light load, only the sub-spray f is injected from the sub-nozzle of the injection nozzle 5 into the 1M combustion chamber 3, and combustion is performed in a richly mixed state in sub-combustion v3. On the other hand, during medium and high loads, not only the sub-spray but also the main injection frost from the main nozzle of the injection nozzle 5 is injected into the main combustion chamber 2. In this case, the flames caused by combustion in the sub-combustion chamber 3 are It is transmitted to the main combustion chamber 2 over the wall of the section 4.
［発明が解決しようとする問題点］
ところが、両燃焼室の連絡通路となるバンク部４上部の
混合気が稀薄状態にある場合やバンク部４上部の絞りが
大きい場合、主燃焼室２の可燃混合気ｍに火種となるよ
うなｌｉ／Ｊ燃焼至３からの火炎がゆきわたらない。[Problems to be Solved by the Invention] However, if the air-fuel mixture in the upper part of the bank part 4, which serves as a communication passage between both combustion chambers, is in a lean state or if the restriction in the upper part of the bank part 4 is large, the flammability of the main combustion chamber 2 The flame from li/J combustion 3, which could become a ignition source, does not spread to the mixture m.
ぞの結果、主燃焼室２での燃焼が生じず、未燃燃料の発
生、出力の低下が生じていた。As a result, combustion did not occur in the main combustion chamber 2, resulting in the generation of unburned fuel and a decrease in output.
［問題点を解決するための手段１
上記の目的を達成するために、本発明はピストン頂部に
主燃焼室と副燃焼室とこれらをその上部で）１！通させ
つつ区画するバンク部を形成υ”ると共にバンク部付近
のビス！ヘン頂部に火炎伝播用の連絡室を形成し、燃料
噴射ノズルの副噴口を副燃焼室に臨まば且つ主噴口を主
燃焼ダと連絡室とに臨まＶたらのである。[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides a main combustion chamber and a sub-combustion chamber at the top of the piston, and a main combustion chamber and a sub-combustion chamber at the top of the piston. At the same time, a communication chamber for flame propagation is formed at the top of the screw hem near the bank, so that the auxiliary nozzle of the fuel injection nozzle faces the auxiliary combustion chamber, and the main nozzle faces the main nozzle. It was in front of the combustion chamber and communication room.
［作 用］
ピストン頂部に主・副燃焼字間を連通ずる火炎伝播用の
連絡室が形成され、この連絡室に燃料が噴射されるので
、Ｄ１燃焼室からの火炎を連絡室を介して確実に主燃焼
室に導くことができる。[Function] A communication chamber for flame propagation is formed at the top of the piston that communicates between the main and auxiliary combustion chambers, and fuel is injected into this communication chamber, so the flame from the D1 combustion chamber is reliably transmitted through the communication chamber. can be led to the main combustion chamber.
［実施例］ 以下に本発明の実施例を図面に基づいて詳述する。[Example] Embodiments of the present invention will be described in detail below based on the drawings.
第１図ないし第２図に示すように、ピストン１の頂部に
は、主燃焼室２と副燃焼室３が形成されている。主燃焼
室２、副燃焼室３とちに球形状をなし上部にはリップ部
６が形成されている。副燃焼室３の寸法は主燃焼室２の
寸法よりも小さい。As shown in FIGS. 1 and 2, a main combustion chamber 2 and a sub-combustion chamber 3 are formed at the top of the piston 1. As shown in FIGS. The main combustion chamber 2 and the sub-combustion chamber 3 each have a spherical shape, and a lip portion 6 is formed at the top. The dimensions of the auxiliary combustion chamber 3 are smaller than the dimensions of the main combustion chamber 2.
主燃焼室２と副燃焼室３との間には両燃焼空を区画する
バンク部４が形成されている。バンク部４の上面はビス
１〜ン１の上面よりも低く、バンク部４の上部にて主・
副燃焼室２，３は連通している。A bank portion 4 is formed between the main combustion chamber 2 and the auxiliary combustion chamber 3 to partition both combustion chambers. The upper surface of the bank section 4 is lower than the upper surface of the screws 1 to 1, and the main
The sub-combustion chambers 2 and 3 are in communication.
また、ビス１−ン１頂部にはバンク部４にその周壁を一
部接続させて、主燃焼室２と副燃焼ｖ３を連通する球形
状の連絡室７が形成されている。５Ｊ燃焼掌３にはスパ
ークプラグ８が設けられており、連絡室７は副燃焼！３
のスパークプラグ８のスワールＳの下流側に位置して設
けられている。連絡室７の容積は副燃焼室３の容積より
小さい。Furthermore, a spherical communication chamber 7 is formed at the top of the screw 1-1 by partially connecting its peripheral wall to the bank portion 4 and communicating the main combustion chamber 2 and the sub-combustion v3. The 5J combustion palm 3 is equipped with a spark plug 8, and the communication chamber 7 is for secondary combustion! 3
The spark plug 8 is located downstream of the swirl S of the spark plug 8. The volume of the communication chamber 7 is smaller than the volume of the auxiliary combustion chamber 3.
バンク部４の上方には燃料噴射ノズル９が設けられてい
る。燃料噴射ノズル９は第３図に示すように、サック付
のピント−ノズルである。１０はニードル弁であり、ノ
ズル本体のスロットル部１１とシート部１２どの間に副
噴口１３が、またサック部１４には二つの主噴口１５゜
１６が形成されている。副噴口１３は副燃焼室３の連絡
室７とは反対側の内壁面に臨ませ且つ副燃焼室３のスワ
ールＳの流れ方向に臨ませて形成されている。また、一
つの主噴口１５は主燃焼室２の連絡室７側の内壁面に臨
ませ且つ主燃焼ｖ２のスワールＳの流れ方向に向けて形
成されている。A fuel injection nozzle 9 is provided above the bank portion 4 . The fuel injection nozzle 9 is a pinto nozzle with a sack, as shown in FIG. Reference numeral 10 designates a needle valve, in which a sub-nozzle port 13 is formed between the throttle portion 11 and the seat portion 12 of the nozzle body, and two main nozzle ports 15 and 16 are formed in the sack portion 14. The sub-nozzle port 13 is formed to face the inner wall surface of the sub-combustion chamber 3 on the side opposite to the communication chamber 7 and to face the flow direction of the swirl S of the sub-combustion chamber 3. Further, one main nozzle 15 is formed facing the inner wall surface of the main combustion chamber 2 on the communication chamber 7 side and facing the flow direction of the swirl S of the main combustion v2.
また、もう一つの主噴口１６は？！絡空室７副燃焼室３
側の内壁面にスワールＳと同方向に向けて臨ませである
。Also, what about the other main nozzle 16? ! Air bubble chamber 7 Sub-combustion chamber 3
The inner wall surface on the side faces in the same direction as the swirl S.
内燃機関のアイドル・軽負荷時（燃料の噴ｔＪＪ量が少
ない時）には、燃料噴射ノズル９のニードル弁１０はシ
ート部１２より離れるがスロットル部１１はほぼ開基状
態に保たれるので、副噴口１３からのみ燃料（ＤＩ噴ｍ
ｆ＞が噴射される。副燃焼室３内は濃混合状態とされ、
スパークプラグ８の点火により副燃焼室３では良好な燃
焼が行なわれる。When the internal combustion engine is idling or under light load (when the amount of fuel injection tJJ is small), the needle valve 10 of the fuel injection nozzle 9 is separated from the seat part 12, but the throttle part 11 is kept in an almost open state. Fuel only from the nozzle 13 (DI injection
f> is injected. The inside of the sub-combustion chamber 3 is in a rich mixed state,
Good combustion occurs in the sub-combustion chamber 3 due to the ignition of the spark plug 8.
一方、機関の中・高負荷時にはニードル弁１０はスロッ
トルリフトを越えるため、副噴口１３から副噴ｎｆが噴
射されるだけでなく、これより遅れて主噴口１５．１６
から主唱ＩＦ１．Ｆ２が噴射される。１ｉｌｌｌ燃焼ｖ
３では第４図ないし第５図に示すように、スパークプラ
グ８の放電により火種ｋが作られ、これより火炎すが副
燃焼室３内を伝播する。副燃焼室３からの火炎すはバン
ク部４上部および連絡室７を経由して主燃焼室２に導か
れるが、連絡室７には主噴霧Ｆ２によりリッチな可燃混
合気−が生成されており、更に連絡室７はバンク部４上
部よりも絞りが小さく通気抵抗が小さいので、副燃焼室
３からの火炎すは主に連＃８室７を通じて主燃焼室２の
可燃混合気ｌに伝えられる。On the other hand, when the engine is under medium or high load, the needle valve 10 exceeds the throttle lift, so not only is the secondary injection nf injected from the secondary injection port 13, but also the secondary injection nf is injected later from the main injection port 15.
Main singer from IF1. F2 is injected. 1ill combustion v
3, as shown in FIGS. 4 and 5, a spark k is created by the discharge of the spark plug 8, and the flame propagates from this inside the sub-combustion chamber 3. The flame from the auxiliary combustion chamber 3 is guided to the main combustion chamber 2 via the upper part of the bank part 4 and the communication chamber 7, but a rich combustible mixture is generated in the communication chamber 7 by the main spray F2. Furthermore, since the communication chamber 7 has a smaller aperture and lower ventilation resistance than the upper part of the bank portion 4, the flame from the auxiliary combustion chamber 3 is mainly transmitted to the combustible mixture l in the main combustion chamber 2 through the series #8 chamber 7. .
このように主燃焼室２と副燃焼室３を連通ずる火炎伝播
用の連絡室７を形成し連絡室７に燃料を噴射して濃混合
気を生成するようにしたので、主・ｒＸＩＩ燃焼室２．
３間の火炎伝播用の連絡通路の絞りや連絡通路の稀Ｍ混
合状態に起因する主燃焼室２での未燃焼を確実に防止で
き、主・副燃焼室２゜３に（１３いて急速な安定した燃
焼を達成できる。このため、未燃燃料が排気されるのを
防ぐことができると其に、機関出力を向上できる。なお
、連絡室７は副燃焼室３からの火炎すを主燃焼室２に急
速に導くことを目的とするものなので、あまり大きな容
積は必要でなく、副燃焼室３と同等かまたはそれ以下で
よい。In this way, the communication chamber 7 for flame propagation that communicates the main combustion chamber 2 and the sub-combustion chamber 3 is formed, and fuel is injected into the communication chamber 7 to generate a rich mixture, so that the main/rXII combustion chamber 2.
It is possible to reliably prevent non-combustion in the main combustion chamber 2 due to the restriction of the communication passage for flame propagation between the two chambers and the rare M mixture state in the communication passage. Stable combustion can be achieved. Therefore, if unburned fuel can be prevented from being exhausted, the engine output can be improved. Note that the communication chamber 7 converts the flame from the auxiliary combustion chamber 3 into the main combustion chamber. Since the purpose is to rapidly introduce the combustion chamber 2 into the combustion chamber 2, the volume does not need to be very large, and may be equal to or smaller than the sub-combustion chamber 3.
なお、上記実施例の燃料噴割ノズル９はピント−タイプ
のしのであったが、機関負荷にかかわらず、主・副燃焼
室に同時に燃料を噴霧する通常のホールタイプの燃料噴
０・１ノズルを用いた直噴式内燃機関にも本発明を適用
することができる。また燃料どしては、軽油だけでなく
、ガソリン、アルコールにし適用できる。Although the fuel injection nozzle 9 in the above embodiment was a pinto type, it may be a normal hole type fuel injection 0/1 nozzle that sprays fuel simultaneously into the main and auxiliary combustion chambers regardless of the engine load. The present invention can also be applied to a direct injection internal combustion engine using a direct injection type internal combustion engine. In addition, the fuel can be applied not only to light oil but also to gasoline and alcohol.
［発明の効果１
以上要するに本発明によれば、主・副燃焼室を連通ずる
火炎伝播用の連絡室を形成し連絡室に燃料を噴射して１
１混合気状態としているため、副燃焼室から主燃焼室へ
の火炎の伝播性を高めることができ、主・副燃焼室での
急速で完全な燃焼が得られ、未燃燃料の発生を防止し、
機関出力を向上できる笠の優れた効果を発揮することが
できる。[Effect of the invention 1] In short, according to the present invention, a communication chamber for flame propagation that communicates the main and sub-combustion chambers is formed, and fuel is injected into the communication chamber.
1 mixture state, it is possible to increase the propagation of flame from the auxiliary combustion chamber to the main combustion chamber, achieve rapid and complete combustion in the main and auxiliary combustion chambers, and prevent the generation of unburned fuel. death,
It is possible to demonstrate the excellent effect of a hat that can improve engine output.
第１図は本発明に係る燃焼室部の一実施例を示す平面図
、第２図は同燃焼室部の側断面図、第３図は第１図の燃
料噴射ノズルの縦断面図、第４図、第５図は第１図の燃
焼室部における燃焼状態を説明するための図、第６図、
第７図は従来の燃焼室部における燃焼状態を説明するた
めの図である。
図中、１はビス１−ン、２は主燃焼室、３は副燃焼室、
４はバンク部、５は燃料噴射ノズル、６はリップ部、７
は連絡室、８はスパークプラグ、９１よ燃料噴射ノズル
、１０はニードル弁、１１はスロワ１−ル部、１２はシ
ート部、１３は副噴口、１４はサック部、１５．１６は
主噴口、ｂは火炎、ｋは火種、ｆはｔｉｔｌＪｌ１３１
． Ｆ、 Ｆｔ 。
Ｆ２は主噴霧、ｍは可燃混合気である。
特許出願人 いすダ自動車株式会社
代理人弁理士 絹 谷 信 雄
第２図
第３図
第４図
第５図FIG. 1 is a plan view showing an embodiment of the combustion chamber according to the present invention, FIG. 2 is a side sectional view of the combustion chamber, and FIG. 3 is a vertical sectional view of the fuel injection nozzle shown in FIG. Figures 4 and 5 are diagrams for explaining the combustion state in the combustion chamber section of Figure 1, Figure 6,
FIG. 7 is a diagram for explaining the combustion state in a conventional combustion chamber. In the figure, 1 is a bison, 2 is a main combustion chamber, 3 is a sub-combustion chamber,
4 is a bank part, 5 is a fuel injection nozzle, 6 is a lip part, 7
is a communication chamber, 8 is a spark plug, 91 is a fuel injection nozzle, 10 is a needle valve, 11 is a throat portion, 12 is a seat portion, 13 is a sub-nozzle port, 14 is a sack portion, 15.16 is a main nozzle port, b is flame, k is fire type, f is titlJl131
．． F, Ft. F2 is the main spray, and m is the combustible mixture. Patent Applicant: Isuda Motors Co., Ltd. Representative Patent Attorney Nobuo Kinuya Figure 2 Figure 3 Figure 4 Figure 5
Claims (2)
の上部で連通させつつ区画するバンク部を形成すると共
にバンク部付近のピストン頂部に火炎伝播用の連絡室を
形成し、燃料噴射ノズルの副噴口を副燃焼室に臨ませ且
つ主噴口を主燃焼室と連絡室とに臨ませたことを特徴と
する直噴式内燃機関の燃焼室構造。(1) A bank part is formed at the top of the piston to separate and communicate the main combustion chamber and the auxiliary combustion chamber at the top, and a communication chamber for flame propagation is formed at the top of the piston near the bank part, and a fuel injection nozzle is formed. A combustion chamber structure for a direct-injection internal combustion engine, characterized in that a sub-nozzle port faces a sub-combustion chamber, and a main nozzle port faces a main combustion chamber and a communication chamber.
か或いは小さくなるように形成された特許請求の範囲第
１項記載の直噴式内燃機関の燃焼室構造。(2) A combustion chamber structure for a direct injection internal combustion engine according to claim 1, wherein the volume of the communication chamber is formed to be equal to or smaller than the volume of the auxiliary combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12907886A JPS62288314A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12907886A JPS62288314A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62288314A true JPS62288314A (en) | 1987-12-15 |
| JPH057534B2 JPH057534B2 (en) | 1993-01-29 |
Family
ID=15000529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12907886A Granted JPS62288314A (en) | 1986-06-05 | 1986-06-05 | Combustion chamber structure of direct injection type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62288314A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19820085A1 (en) * | 1998-05-06 | 1999-11-11 | Audi Ag | Direct injection diesel internal combustion engine |
| WO2002095201A1 (en) * | 2001-05-21 | 2002-11-28 | Robert Bosch Gmbh | Fuel injection system |
-
1986
- 1986-06-05 JP JP12907886A patent/JPS62288314A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19820085A1 (en) * | 1998-05-06 | 1999-11-11 | Audi Ag | Direct injection diesel internal combustion engine |
| DE19820085B4 (en) * | 1998-05-06 | 2007-12-27 | Audi Ag | Direct injection internal combustion engine |
| WO2002095201A1 (en) * | 2001-05-21 | 2002-11-28 | Robert Bosch Gmbh | Fuel injection system |
| US6883491B2 (en) | 2001-05-21 | 2005-04-26 | Robert Bosch Gmbh | Fuel injection system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH057534B2 (en) | 1993-01-29 |
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