JPS59158316A - Diesel engine combustion chamber - Google Patents

Diesel engine combustion chamber

Info

Publication number
JPS59158316A
JPS59158316A JP58032620A JP3262083A JPS59158316A JP S59158316 A JPS59158316 A JP S59158316A JP 58032620 A JP58032620 A JP 58032620A JP 3262083 A JP3262083 A JP 3262083A JP S59158316 A JPS59158316 A JP S59158316A
Authority
JP
Japan
Prior art keywords
cavity
recess
flow
smoke
circumference
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
Application number
JP58032620A
Other languages
Japanese (ja)
Inventor
Takayuki Suzuki
孝幸 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Hino Jidosha Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hino Motors Ltd, Hino Jidosha Kogyo KK filed Critical Hino Motors Ltd
Priority to JP58032620A priority Critical patent/JPS59158316A/en
Publication of JPS59158316A publication Critical patent/JPS59158316A/en
Pending legal-status Critical Current

Links

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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
    • F02B23/0621—Squish flow
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition 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)

Abstract

PURPOSE:In an engine having cavity in the top of piston, to reduce smoke thus to improve burning efficiency by providing a small recess having step between the circumference of cavity in cylinder head. CONSTITUTION:A cavity 13 is made in the top 12 of piston 11. A recess 15 is made in the inner face of cylinder head 14 while a gap (H) is made against the circumference 16 of cavity 13. Immediately before completion of compression stroke, squish flow P1 will produce small eddy flow m1 while squish flow P2 will produce small eddy flow m2 to promote mixing of fuel and air. At the initial stage of combustion stroke, counter-squish flow P3 is reduced by the recess 15 to suppress smoke. Consequently smoke and thermal breakdown of cavity circumference are reduced resulting in improvement of combustion efficiency.

Description

【発明の詳細な説明】 本発明はスキッシュ流を強め、かつ燃暁行稈時の逆スキ
ッシュ流を防止することにより煙の低減などの燃焼改善
を行ったディーゼルエンジンの燃焼室に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion chamber for a diesel engine that improves combustion such as reducing smoke by strengthening squish flow and preventing reverse squish flow during combustion.

従来のトロイダル燃焼室は、ピストン頂部にキャビティ
ーを設けたものとなっており、剖・１図の（イ）、（ロ
）に示すような欠点があった。The conventional toroidal combustion chamber has a cavity at the top of the piston, and has the disadvantages shown in (a) and (b) of Figure 1.

すなわち、２・１図の（イ）はエンジンの圧縮行程終了
直前であるが、ピストン１０頂面２とシリンダヘッド３
との間から押し出されたスキッシュ流４によりキャビテ
ィ５内を攪乱し、キャビティー５内の空気と燃料の混合
を促進するが、スキッシュ流４によるミキシング効果が
未だ十分でない。In other words, (a) in Figure 2.1 is just before the end of the compression stroke of the engine, but the top surface 2 of the piston 10 and the cylinder head 3
Although the inside of the cavity 5 is disturbed by the squish flow 4 pushed out from between the two, and the mixing of the air and fuel in the cavity 5 is promoted, the mixing effect of the squish flow 4 is still not sufficient.

又、キャビティー５のエツジ６の面取りを行うとスキッ
シュ流４が弱まり、エツジ６をとがらすと熱破壊を起こ
す恐れがあった。Furthermore, if the edges 6 of the cavity 5 were chamfered, the squish flow 4 would be weakened, and if the edges 6 were sharpened, there was a risk of thermal destruction.

又、矛１図の（ロ）に示すエンジンの爆発行程の初期シ
ておいて、キャビティー５内の燃焼ガスが逆スキッシュ
流７となってピストン１の頂面２とシリンダヘッド３０
間に流入する。すると、燃焼ガスが冷やされて煙を生じ
、燃焼を悪化させる。Also, at the beginning of the engine's explosion stroke shown in Figure 1 (b), the combustion gas in the cavity 5 becomes a reverse squish flow 7 and flows between the top surface 2 of the piston 1 and the cylinder head 30.
flows in between. The combustion gases are then cooled and produce smoke, which worsens combustion.

本発明の目的は上記欠点を改善し、スキッシュ流中に多
数の小渦流を生成させ、かつ逆スキッシュ流を低減させ
ることにより燃焼を改善したディーゼルエンジンの燃焼
室を提供せんとするものである。SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks and to provide a combustion chamber for a diesel engine that improves combustion by generating a large number of small vortices in the squish flow and reducing reverse squish flow.

則・２図は本発明の一実施例を示す略断面図である。Figure 2 is a schematic sectional view showing an embodiment of the present invention.

ピストン１１の頂面１２にはキャビティ１３が設けられ
ている。シリンダヘッド１４の内面噸ても僅かな深さの
凹み１５が設けられている。キャビティー１３の周縁１
６と凹み１５の周縁１７との量定はＨの段差が設けられ
、キャビティー１３よりも凹み１５の方が小さくなって
いる。凹み１５の深さは１〜３ｍｍ程度とされる。又、
給排気弁（図示しない）をさげて凹み１５を設けろか、
給排気弁にも凹みを設けるかはどちらを採用してもよく
、給排気弁の周縁も含めて凹ませるようにしてもよい。A cavity 13 is provided in the top surface 12 of the piston 11. A recess 15 with a slight depth is provided on the inner surface of the cylinder head 14. Periphery 1 of cavity 13
6 and the peripheral edge 17 of the recess 15 are provided with a step H, and the recess 15 is smaller than the cavity 13. The depth of the recess 15 is approximately 1 to 3 mm. or,
Should I lower the supply/exhaust valve (not shown) and create a recess 15?
Either way may be adopted as to whether the supply/exhaust valve is also provided with a recess, and the periphery of the supply/exhaust valve may also be recessed.

上記の如く構成された本発明の作用を２・３図の（イ）
、（ロ）を参照して説明する。The operation of the present invention configured as described above is shown in (a) in Figures 2 and 3.
This will be explained with reference to , (b).

（イ）は圧縮行程の終了直前を示すもので、スキッシュ
流はＰｌとＰ２に分かれ、Ｐ、は凹み１５の周縁１フイ
」近に１η１の小商流を生じさせ、Ｐ２はキャビティー
１３０周縁１６例近に０１□の小渦流を生じさせる。こ
の小渦流ｍ、　、　ｌη２はキャビティ　１３内つ燃焼
室１８全体に拡がり、燃料と空気の混合を促進させる。(a) shows just before the end of the compression stroke, the squish flow is divided into Pl and P2, P, generates a small commercial flow of 1η1 near the periphery of the cavity 15, and P2 produces a small commercial flow of 1η1 near the periphery of the cavity 130. A small vortex of 01□ is generated near 16 cases. These small vortices m, , lη2 spread within the cavity 13 and throughout the combustion chamber 18, promoting the mixing of fuel and air.

又、キャビティ１３の周縁１６を面取りしても凹み１５
０周縁１７と協働してスキッシュＰ、　、Ｉ）２を生せ
しめるのでスキッシュ強さを低下させな（・。Moreover, even if the peripheral edge 16 of the cavity 13 is chamfered, the recess 15
Since it cooperates with the 0 peripheral edge 17 to produce squish P, , I)2, the squish strength should not be reduced (・.

（ロ）はエンジンの爆発行程初期を示すもので、燃焼室
１８内のガスの流れは図の矢印の如くなっている。逆ス
キッシュ流Ｉ〕３が多いと煙の発生原因となるが、本発
明では凹み１５によってガスの流れがＰ４の如く偏向さ
れ、逆スキッシュ流Ｐ３を低減し、燃焼ガスの冷却ｌで
よる煙の発生を抑えるものである。(b) shows the initial stage of the engine's explosion stroke, and the flow of gas in the combustion chamber 18 is as shown by the arrows in the figure. If there is a large amount of reverse squish flow I]3, it will cause smoke to be generated, but in the present invention, the gas flow is deflected as shown by P4 by the recess 15, reducing the reverse squish flow P3 and reducing the amount of smoke generated by cooling the combustion gas. This is to suppress the occurrence.

以上のとおり、本発明によると煙の低減、キャビティー
周縁の熱破壊の低減を達成し、かつ燃暁幼率の向上に寄
与するものである。As described above, according to the present invention, it is possible to reduce smoke, reduce thermal damage around the cavity, and contribute to improving the combustion rate.

【図面の簡単な説明】[Brief explanation of drawings]

１・１図は従来のディーセルエンジンの−例な示す断面
図、３・２図は本発明の一実施例を示す断面図、オ・３
図（イ）、（ロ）は本発明の作用を示す図である。 １１：ピストン、１３：キャビティ、１５：凹み代理人
　弁理士　　辻　　ミ　部 第１図 （イ） （ロ） 第２図 第３図 （イ） （ロ）1.1 is a sectional view showing an example of a conventional diesel engine, 3.2 is a sectional view showing an embodiment of the present invention, and 3.2 is a sectional view showing an example of the present invention.
Figures (a) and (b) are diagrams showing the effects of the present invention. 11: Piston, 13: Cavity, 15: Dent Agent Patent Attorney Mi Tsuji Part Figure 1 (A) (B) Figure 2 Figure 3 (A) (B)

Claims (1)

【特許請求の範囲】[Claims] ピストン頂部にキャビティを設けたディーゼルエンジン
において、該キャビティの周縁との間Ｋ　ｆ：１の段差
を設けた僅かな凹みをシリンダヘッドに設けたことを特
徴とするディーゼルエンジンの燃焼室A combustion chamber of a diesel engine having a cavity at the top of a piston, characterized in that the cylinder head is provided with a slight recess with a step of Kf:1 between the cavity and the periphery of the cavity.
JP58032620A 1983-02-28 1983-02-28 Diesel engine combustion chamber Pending JPS59158316A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58032620A JPS59158316A (en) 1983-02-28 1983-02-28 Diesel engine combustion chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58032620A JPS59158316A (en) 1983-02-28 1983-02-28 Diesel engine combustion chamber

Publications (1)

Publication Number Publication Date
JPS59158316A true JPS59158316A (en) 1984-09-07

Family

ID=12363890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58032620A Pending JPS59158316A (en) 1983-02-28 1983-02-28 Diesel engine combustion chamber

Country Status (1)

Country Link
JP (1) JPS59158316A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63140135U (en) * 1987-03-06 1988-09-14
JP2012052530A (en) * 2010-08-12 2012-03-15 Crf Soc Consortile Per Azioni Combustion chamber for diesel engine with inclined engine valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5753022B2 (en) * 1977-05-27 1982-11-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5753022B2 (en) * 1977-05-27 1982-11-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63140135U (en) * 1987-03-06 1988-09-14
JP2012052530A (en) * 2010-08-12 2012-03-15 Crf Soc Consortile Per Azioni Combustion chamber for diesel engine with inclined engine valve

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