JPH05209528A - Combustion chamber of direct injection type diesel engine - Google Patents

Combustion chamber of direct injection type diesel engine

Info

Publication number
JPH05209528A
JPH05209528A JP4040473A JP4047392A JPH05209528A JP H05209528 A JPH05209528 A JP H05209528A JP 4040473 A JP4040473 A JP 4040473A JP 4047392 A JP4047392 A JP 4047392A JP H05209528 A JPH05209528 A JP H05209528A
Authority
JP
Japan
Prior art keywords
combustion chamber
turbulent
current
diesel engine
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.)
Pending
Application number
JP4040473A
Other languages
Japanese (ja)
Inventor
Tetsuya Otani
哲也 大谷
Chuichi Shiozaki
忠一 塩崎
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
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 filed Critical Hino Motors Ltd
Priority to JP4040473A priority Critical patent/JPH05209528A/en
Publication of JPH05209528A publication Critical patent/JPH05209528A/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
    • F02B23/0672—Omega-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 center axis
    • 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
    • F02B23/0645—Details related to the fuel injector or the fuel spray
    • F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
    • 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
    • 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
    • F02B23/0624—Swirl 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
    • 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

Abstract

PURPOSE:To activate combustion of fuel mist and reduce black fume by forming a plurality of projections on the inner circumferential wall of a combustion chamber along the circumference at an interval, by making interference of these projections with swirl current of intake air, and whereby generating a turbulent current and a turbulent region. CONSTITUTION:A direct injection type diesel engine is provided with a re-entrant type combustion chamber 2 opening to the top surface of a piston 1. A plurality of projections 4 are formed on an inner circumferential wall 3 of the combustion chamber 2 along the circumference at an interval. Fuel mist 5 flows along the swirl current generated by intake air, and is burned. Part of the swirl current is stemmed by the projection 4. Since the swirl current turns into a turbulent current 7 by the projection 4, a turbulent region 8 is formed by the swirl current and the turbulent current 7. Mixture of the fuel mist 5 and the intake air is promoted in the turbulent region 8, and combustion is activated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、直接噴射式デイ−ゼ
ルエンジンの燃焼室に係り、詳しくはリエントラント型
燃焼室の内周壁に吸入空気のスワ−ル流に干渉して乱れ
流を作り、燃料噴霧の燃焼を活発化して黒煙の発生を抑
制する燃焼室に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion chamber of a direct injection type diesel engine, and more specifically, to a turbulent flow in an inner wall of a reentrant type combustion chamber by interfering with a swirl flow of intake air, The present invention relates to a combustion chamber that activates combustion of fuel spray to suppress generation of black smoke.

【０００２】[0002]

【従来の技術】直接噴射式デイ−ゼルエンジンの燃焼室
は、燃料の経済性、出力向上等の利点があるため、特に
大型車において広く採用されているが、エンジン回転
数、負荷の変動に対して敏感であるため、高負荷又は加
速時のように、燃料噴霧量が多い場合に不完全燃焼を生
じ、黒煙を発生するおそれがある。2. Description of the Related Art The combustion chamber of a direct-injection diesel engine is widely used especially in large vehicles because it has advantages such as fuel economy and output improvement. Since it is sensitive to a large amount of fuel spray, such as during high load or acceleration, incomplete combustion may occur and black smoke may be generated.

【０００３】[0003]

【発明が解決しようとする課題】このような黒煙発生を
抑制するためには、燃料噴霧を空気とよく混合させる必
要があり、この発明はこの目的の下にスワ−ル流以外の
乱れ流を燃焼室の内周壁部に形成して噴射された燃料の
より完全な燃焼を達成し、黒煙の発生を低減しようとす
るものである。In order to suppress the generation of such black smoke, it is necessary to mix the fuel spray well with the air, and the present invention has a turbulent flow other than the swirl flow for this purpose. Is formed on the inner peripheral wall of the combustion chamber to achieve more complete combustion of the injected fuel and to reduce the generation of black smoke.

【０００４】[0004]

【課題を解決するための手段】すなわちこの発明は、リ
エントラント型燃焼室がピストンの上部に形成されてい
る直接噴射式デイ−ゼルエンジンの燃焼室において、前
記燃焼室の内周壁に周方向に間隔を置いて複数個の突起
を形成し、これら突起を吸入空気のスワ−ル流に干渉さ
せて乱れ流を形成させ、もつて、スワ−ル流と乱れ流と
によつて生じた乱れ域が、燃料噴霧の燃焼を活発化する
ようにしたことを特徴とする直接噴射式デイ−ゼルエン
ジンの燃焼室を提案するものである。SUMMARY OF THE INVENTION That is, according to the present invention, in a combustion chamber of a direct injection type diesel engine in which a reentrant type combustion chamber is formed in an upper portion of a piston, a circumferential space is provided on an inner peripheral wall of the combustion chamber. To form a plurality of protrusions, and these protrusions interfere with the swirl flow of the intake air to form a turbulent flow, and thus the turbulent region generated by the swirl flow and the turbulent flow is generated. The present invention proposes a combustion chamber of a direct injection type diesel engine, which is characterized in that combustion of fuel spray is activated.

【０００５】[0005]

【作用】上記構成からなるこの発明の燃焼室において、
前記複数個の突起は、吸入空気のスワ−ル流に対して流
れ止めとして作用し、ここに乱れ流を発生させ、この乱
れ流によつて生じた乱れ域が、燃料噴霧の燃焼を活発化
させるのである。In the combustion chamber of the present invention having the above structure,
The plurality of projections act as a flow stop for the swirl flow of the intake air, generate a turbulent flow there, and the turbulent region generated by this turbulent flow activates combustion of the fuel spray. Let them do it.

【０００６】[0006]

【実施例】次にこの発明を添付図面に示す実施例にした
がつて詳細に説明する。図１は噴射式デ−ゼルエンジン
のピストン１の頂部の縦断面図であつて、図２はその平
面図である。このピストン１の頂面に開口するリエント
ラント型燃焼室２の内周壁３には、周方向に間隔を置い
て複数個の突起４を形成するものとし、その詳細を図３
に拡大して示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a vertical sectional view of a top portion of a piston 1 of an injection type diesel engine, and FIG. 2 is a plan view thereof. A plurality of protrusions 4 are formed at intervals in the circumferential direction on the inner peripheral wall 3 of the reentrant type combustion chamber 2 opening at the top surface of the piston 1, the details of which are shown in FIG.
Enlarged to show.

【０００７】図に表われないインジエクシヨンノズルか
らの燃料噴霧は図１で符号５で示すように噴射される
（図には噴口が４個の場合を示す）。これらの燃料噴霧
５は吸入空気によつて形成されるスワ−ル流６に沿つて
流され燃焼するのであるが、このスワ−ル流６の一部は
前記突起４によつて流れを止められる。The fuel spray from the injection nozzle, which is not shown in the figure, is injected as shown by reference numeral 5 in FIG. 1 (in the figure, there are four injection ports). These fuel sprays 5 flow along the swirl flow 6 formed by the intake air and burn, but a part of the swirl flow 6 is stopped by the projections 4. .

【０００８】その状況を図３によつて説明すると、前記
スワ−ル流６は突起４によつてその一部を乱れ流７とさ
れ、ここにスワ−ル流６と乱れ流７とによつて乱れ域８
が形成される。前記燃料噴霧５はこの乱れ域８によつ
て、吸入空気との混合を促進され、燃焼が活発化される
のである。実際上、突起４の数はインジエクシヨンノズ
ルに形成される噴口の数に対応させるものとする。The situation will be described with reference to FIG. 3. The swirl flow 6 is partly made into a turbulent flow 7 by the projections 4, and here, the swirl flow 6 and the turbulent flow 7 are caused. About disorder area 8
Is formed. The turbulence region 8 promotes the mixing of the fuel spray 5 with the intake air and activates combustion. In practice, the number of projections 4 corresponds to the number of injection holes formed in the injection nozzle.

【０００９】この発明の上述の構成からなる燃焼室にお
いて、内周壁に形成した突起が、スワ−ル流の一部を乱
れ流とし、これによりスワ−ル流と乱れ流とによつて生
じた乱れ域が燃料噴霧の燃焼を活発化するのに役立つた
め、黒煙の低減に寄与するところ大なるものがある。In the combustion chamber having the above-mentioned structure according to the present invention, the projection formed on the inner peripheral wall causes a part of the swirl flow to be turbulent flow, which is caused by the swirl flow and the turbulent flow. Since the turbulence region helps activate the combustion of the fuel spray, it contributes greatly to the reduction of black smoke.

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

【図１】この発明のリエントラント型燃焼室を備える直
接噴射式デイ−ゼルエンジンのピストンの頂部の竪断面
図である。FIG. 1 is a vertical sectional view of a top portion of a piston of a direct injection type diesel engine having a reentrant combustion chamber of the present invention.

【図２】図１に示す部分の平面図である。FIG. 2 is a plan view of a portion shown in FIG.

【図３】図２の一部を拡大して示す詳細図である。FIG. 3 is a detailed view showing a part of FIG. 2 in an enlarged manner.

【符号の説明】[Explanation of symbols]

１ ピストン ２ リエントラント型燃焼室 ３ 内周壁 ４ 突起 ５ 燃料噴霧 ６ スワ−ル流 ７ 乱れ流 ８ 乱れ域 DESCRIPTION OF SYMBOLS 1 Piston 2 Reentrant type combustion chamber 3 Inner peripheral wall 4 Protrusion 5 Fuel spray 6 Swirl flow 7 Turbulent flow 8 Turbulent region

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 リエントラント型燃焼室がピストンの上
部に形成されている直接噴射式デイ−ゼルエンジンの燃
焼室において、前記燃焼室の内周壁に周方向に間隔を置
いて複数個の突起を形成し、これら突起を吸入空気のス
ワ−ル流に干渉させて乱れ流を形成させ、もつて、スワ
−ル流と乱れ流とによつて生じた乱れ域が、燃料噴霧の
燃焼を活発化するようにしたことを特徴とする直接噴射
式デイ−ゼルエンジンの燃焼室。1. In a combustion chamber of a direct injection type diesel engine in which a reentrant combustion chamber is formed in an upper portion of a piston, a plurality of protrusions are formed on an inner peripheral wall of the combustion chamber at circumferential intervals. Then, these protrusions interfere with the swirl flow of the intake air to form a turbulent flow, and the turbulent region generated by the swirl flow and the turbulent flow activates combustion of the fuel spray. Combustion chamber of direct injection type diesel engine characterized by the above.
JP4040473A 1992-01-31 1992-01-31 Combustion chamber of direct injection type diesel engine Pending JPH05209528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4040473A JPH05209528A (en) 1992-01-31 1992-01-31 Combustion chamber of direct injection type diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4040473A JPH05209528A (en) 1992-01-31 1992-01-31 Combustion chamber of direct injection type diesel engine

Publications (1)

Publication Number Publication Date
JPH05209528A true JPH05209528A (en) 1993-08-20

Family

ID=12581597

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4040473A Pending JPH05209528A (en) 1992-01-31 1992-01-31 Combustion chamber of direct injection type diesel engine

Country Status (1)

Country Link
JP (1) JPH05209528A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030026585A (en) * 2001-09-26 2003-04-03 현대자동차주식회사 Combustion chamber of diesel engine
JP2011220118A (en) * 2010-04-02 2011-11-04 Toyota Motor Corp Internal combustion engine, cylinder head, and piston

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030026585A (en) * 2001-09-26 2003-04-03 현대자동차주식회사 Combustion chamber of diesel engine
JP2011220118A (en) * 2010-04-02 2011-11-04 Toyota Motor Corp Internal combustion engine, cylinder head, and piston

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