JPH04228821A - Combustion chamber of direct injection diesel engine - Google Patents
Combustion chamber of direct injection diesel engineInfo
- Publication number
- JPH04228821A JPH04228821A JP2408346A JP40834690A JPH04228821A JP H04228821 A JPH04228821 A JP H04228821A JP 2408346 A JP2408346 A JP 2408346A JP 40834690 A JP40834690 A JP 40834690A JP H04228821 A JPH04228821 A JP H04228821A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- protrusion
- diesel engine
- fuel
- direct injection
- 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 53
- 238000002347 injection Methods 0.000 title claims abstract description 31
- 239000007924 injection Substances 0.000 title claims abstract description 31
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 239000000779 smoke Substances 0.000 abstract description 10
- 239000000567 combustion gas Substances 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 36
- 239000007789 gas Substances 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 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
- 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
- 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
- F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
- F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
-
- 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
- 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
- F02B23/0621—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
- 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)
- Dispersion Chemistry (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、スモーク及び窒素酸化
物を低減させるための直接噴射式ディーゼル機関の燃焼
室に関する。FIELD OF THE INVENTION This invention relates to the combustion chamber of a direct injection diesel engine for reducing smoke and nitrogen oxides.
【０００２】0002
【従来の技術】現在、ディーゼル機関においてスモーク
及び窒素酸化物の低減は重要な課題であり、その低減に
向けて排気ガス再循環法（ＥＧＲ）や燃焼方式の改善等
において種々の提案が行われている。このうちＥＧＲは
、燃費及びスモークの悪化、排ガスによるＥＧＲ装置の
腐食、或いは機能低下等、耐久性及び信頼性の問題があ
る。また、燃焼方式の観点から見れば、低圧噴射の場合
、噴霧はノズル近傍で着火した後全体が火炎に包まれな
がら進行し、この時噴霧は、空気と同時に自己の生成し
た既燃ガスを巻き込みながら燃焼するので、噴霧中心部
において高温部、酸素不足部が形成されススの生成要因
となり、既燃ガスの巻き込みはマイナス要因として働く
と言われている。また、燃料と空気を迅速に混合するた
めにスワール、スキッシュ等により空気利用率を向上し
ススを低減する方法が採られているが、これでは着火遅
れの間の燃料、空気混合速度も増大するため、予混合燃
焼の増加により燃焼初期の熱発生率が増大し、窒素酸化
物の増大を招くという問題を有している。[Prior Art] Reducing smoke and nitrogen oxides is currently an important issue in diesel engines, and various proposals have been made to reduce them, such as exhaust gas recirculation (EGR) and improving combustion methods. ing. Among these, EGR has problems with durability and reliability, such as deterioration of fuel efficiency and smoke, corrosion of the EGR device due to exhaust gas, or deterioration of function. Also, from the viewpoint of combustion method, in the case of low-pressure injection, the spray ignites near the nozzle and then progresses while being completely enveloped in flames. As a result, a high-temperature area and an oxygen-deficient area are formed in the center of the spray, which becomes a factor in the generation of soot, and the entrainment of burnt gas is said to act as a negative factor. In addition, in order to quickly mix fuel and air, methods such as swirl and squish are used to improve air utilization and reduce soot, but this also increases the fuel and air mixing speed during the ignition delay. Therefore, there is a problem in that the increase in premixed combustion increases the rate of heat generation in the initial stage of combustion, leading to an increase in nitrogen oxides.
【０００３】上記問題を解決するために、高圧噴射、小
噴孔径ノズル、浅皿燃焼室および低スワールを組合せる
方式が知られている。この場合には、壁面で一気に着火
した後、火炎はゆっくりとキャビティ中心に向かって膨
張し、噴射の終了まで中心部は不燃域として残る。すな
わち、噴霧は壁面に到達するまでキャビティ中心に近い
不燃域側で十分に空気を巻き込みながら進行し、壁面側
では既燃ガスを導入しながら壁面に衝突する二段の燃焼
経路をたどり、低圧噴射と比較してスモーク及び窒素酸
化物の低減を図ることができる。[0003] In order to solve the above problems, a method is known that combines high pressure injection, a small injection hole diameter nozzle, a shallow dish combustion chamber, and a low swirl. In this case, after igniting at once on the wall surface, the flame slowly expands toward the center of the cavity, and the center remains as a nonflammable region until the end of injection. In other words, the spray travels through the non-flammable area near the center of the cavity while entrapping sufficient air until it reaches the wall, and then follows a two-stage combustion path where it collides with the wall while introducing burnt gas, resulting in low-pressure injection. It is possible to reduce smoke and nitrogen oxides compared to the conventional method.
【０００４】0004
【発明が解決しようとする課題】しかしながら、上記従
来の高圧噴射方式においては、着火までの空気の導入量
が多いため、窒素酸化物の発生が増大するという問題を
有し、また、燃焼室が円筒形状であるため着火後の噴霧
への既燃ガスの導入が少なく、窒素酸化物の発生が増大
するという問題を有している。[Problems to be Solved by the Invention] However, the conventional high-pressure injection method described above has the problem of increasing the amount of nitrogen oxides generated due to the large amount of air introduced until ignition. Because of the cylindrical shape, there is a problem in that less burned gas is introduced into the spray after ignition, and the generation of nitrogen oxides increases.
【０００５】本発明は上記問題を解決するものであって
、燃焼室の構造を改善することにより、スモーク及び窒
素酸化物の低減を図ることができる直接噴射式ディーゼ
ル機関の燃焼室を提供することを目的とする。The present invention solves the above problems, and provides a combustion chamber for a direct injection diesel engine that can reduce smoke and nitrogen oxides by improving the structure of the combustion chamber. With the goal.
【０００６】[0006]
【課題を解決するための手段】そのために本発明の直接
噴射式ディーゼル機関の燃焼室は、ピストン１の頂部に
形成される燃焼室７と、シリンダヘッド５に配設される
燃料噴射弁６とを有し、前記燃料噴射弁６のノズル６ａ
に対向して燃焼室１０の底面に突出部９を形成すると共
に、燃焼室７の底面または壁面１１に複数の突起部を形
成し、該突起部の間に燃料を噴射することを特徴とする
。突起部の例としては、壁面１１の根元に窪み１２ａを
有する曲面形状の突起部１２を設ける方式、壁面１１か
ら径方向に延びるプレート形状の突起部１３を設ける方
式、燃焼室７の底面にロッド形状の突起部１５、１６を
設ける方式がある。なお、上記構成に付加した番号は、
理解を容易にするために図面と対比させるためのもので
、これにより本発明の構成が何ら限定されるものではな
い。[Means for Solving the Problems] To this end, the combustion chamber of the direct injection diesel engine of the present invention includes a combustion chamber 7 formed at the top of the piston 1 and a fuel injection valve 6 disposed in the cylinder head 5. and a nozzle 6a of the fuel injection valve 6.
A protrusion 9 is formed on the bottom surface of the combustion chamber 10 facing the combustion chamber 10, and a plurality of protrusions are formed on the bottom surface or wall surface 11 of the combustion chamber 7, and fuel is injected between the protrusions. . Examples of the protrusion include a method in which a curved protrusion 12 having a recess 12a is provided at the base of the wall surface 11, a method in which a plate-shaped protrusion 13 is provided extending radially from the wall surface 11, and a method in which a protrusion 13 in the shape of a plate is provided at the bottom of the combustion chamber 7. There is a method of providing shaped protrusions 15 and 16. The numbers added to the above configuration are as follows:
This is for comparison with the drawings to facilitate understanding, and the configuration of the present invention is not limited thereby.
【０００７】[0007]
【作用】本発明においては例えば図１及び図２に示すよ
うに、ピストン１が上昇し上死点付近に達したとき、燃
料は、ノズル６ａから突出部９に沿い各突起部１２の略
中間部に向けて噴射され、壁面１１に衝突して着火する
。このとき、突出部９とシリンダヘッド５との間の間隙
１０が小さいため、噴霧への空気導入が抑えられ初期燃
焼を抑えることができ、燃料が壁面１１で一気に着火す
ると、中心部において新気Ａの導入が促進されると共に
、突起部１２の窪み１２ａの存在により、燃焼火炎が広
がるのが押さえられ、既燃ガスＧの巻き込みが促進され
るため、スモークを押さえつつ窒素酸化物の低減を図る
ことができる。[Operation] In the present invention, as shown in FIGS. 1 and 2, for example, when the piston 1 rises and reaches near the top dead center, the fuel flows from the nozzle 6a along the protrusion 9 approximately halfway between each protrusion 12. The fuel is injected toward the wall, collides with the wall surface 11, and ignites. At this time, since the gap 10 between the protrusion 9 and the cylinder head 5 is small, the introduction of air into the spray can be suppressed and initial combustion can be suppressed, and when the fuel is ignited at once on the wall surface 11, fresh air is generated in the center. In addition to promoting the introduction of gas G, the presence of the recess 12a of the protrusion 12 suppresses the spread of the combustion flame and promotes the entrainment of the burnt gas G, thereby reducing nitrogen oxides while suppressing smoke. can be achieved.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。図１及び図２は、本発明の直接噴射式ディーゼ
ル機関の燃焼室の１実施例を示し、それぞれ（Ａ）は平
面図、（Ｂ）は断面図である。１はピストン、２はピス
トンリング、３はシリンダライナー、４はガスケット、
５はシリンダヘッド、６はノズル６ａを有する燃料噴射
弁を示し、ピストン１の頂部には、燃焼室７が形成され
ている。ピストン１に形成される燃焼室７は、その底面
にノズル６ａに対向して突出部９を形成し、ピストン１
が上昇し上死点に達したとき突出部９とシリンダヘッド
５との間に僅かの間隙１０を形成するように構成してい
る。なお、点線で示した突出部９ａは従来例を示す。ま
た、燃焼室７の周囲の壁面１１には、その根元に窪み１
２ａを有する曲面形状の突起部１２が等間隔で形成され
ている。該突起部１２は、ノズル６ａの噴射孔の数（図
では６個）だけ設けられ、ノズル６ａからの燃料Ｆを各
突起部１２の略中間部に向けて噴射するようにしている
。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show one embodiment of a combustion chamber of a direct injection diesel engine according to the present invention, in which (A) is a plan view and (B) is a sectional view, respectively. 1 is the piston, 2 is the piston ring, 3 is the cylinder liner, 4 is the gasket,
5 is a cylinder head, 6 is a fuel injection valve having a nozzle 6a, and a combustion chamber 7 is formed at the top of the piston 1. The combustion chamber 7 formed in the piston 1 has a protrusion 9 formed on its bottom face facing the nozzle 6a, and the piston 1
The structure is such that a slight gap 10 is formed between the protruding portion 9 and the cylinder head 5 when the cylinder head rises and reaches the top dead center. Note that the protrusion 9a indicated by a dotted line indicates a conventional example. In addition, the wall surface 11 around the combustion chamber 7 has a depression 1 at its base.
2a are formed at equal intervals. The protrusions 12 are provided in the same number as the injection holes of the nozzles 6a (six in the figure), and the fuel F from the nozzles 6a is injected toward approximately the middle of each protrusion 12.
【０００９】上記構成からなる本発明の作用について説
明する。図１に示すように、ピストン１が上昇し上死点
付近に達したとき、燃料Ｆは、ノズル６ａから突出部９
に沿い各突起部１２の略中間部に向けて噴射され、壁面
１１に衝突して着火する。このとき、突出部９とシリン
ダヘッド５との間の間隙１０が小さいため、噴霧への空
気導入が抑えられ初期燃焼を抑えることにより窒素酸化
物の低減を図ることができる。図２に示すように、燃料
が壁面１１で一気に着火すると、中心部において新気Ａ
の導入が促進されると共に、突起部１２の窪み１２ａの
存在により、燃焼火炎が広がるのが押さえられ、既燃ガ
スＧの巻き込みが促進されるため、スモークを押さえつ
つ及び窒素酸化物の低減を図ることができる。The operation of the present invention having the above structure will be explained. As shown in FIG. 1, when the piston 1 rises and reaches near the top dead center, the fuel F flows from the nozzle 6a to the protrusion 9.
The fuel is injected toward approximately the middle of each protrusion 12 along the direction, collides with the wall surface 11, and ignites. At this time, since the gap 10 between the protrusion 9 and the cylinder head 5 is small, the introduction of air into the spray is suppressed, and by suppressing initial combustion, nitrogen oxides can be reduced. As shown in FIG. 2, when the fuel ignites at once on the wall surface 11, fresh air A
In addition, the presence of the recess 12a of the protrusion 12 suppresses the spread of the combustion flame and promotes the entrainment of the burnt gas G, thereby suppressing smoke and reducing nitrogen oxides. can be achieved.
【００１０】図３乃至図５は本発明の他の実施例を示し
、図１の実施例と同一の構成については同一番号を付け
て説明を省略する。図３の実施例においては、突出部９
をさらに高くすると共に、突出部９の上面に径方向に燃
料通路９ｂを形成し、噴霧への空気導入を抑えて初期燃
焼を抑えることにより窒素酸化物の低減をさらに図るよ
うにしている。FIGS. 3 to 5 show other embodiments of the present invention, and the same components as those in the embodiment of FIG. 1 are given the same numbers and their explanations will be omitted. In the embodiment of FIG.
In addition, a fuel passage 9b is formed in the radial direction on the upper surface of the protrusion 9 to further reduce nitrogen oxides by suppressing air introduction into the spray and suppressing initial combustion.
【００１１】図４の実施例においては、燃焼室７の周囲
の壁面１１に径方向に延びるプレート形状の突起部１３
を等間隔で形成している。In the embodiment shown in FIG. 4, a plate-shaped protrusion 13 is provided on the wall surface 11 around the combustion chamber 7 and extends in the radial direction.
are formed at equal intervals.
【００１２】図５の実施例においては、燃焼室７の底面
で且つ壁面１１の近傍に複数組のロッド形状の突起部１
５、１６を配設し、ノズル６ａからの燃料を突起部１５
、１６の間に向けて噴射するようにしている。噴霧が突
起部１５、１６の間を通過すると、突起部１５、１６の
噴孔側の圧力が下がるため火炎が巻き込まれやすくなり
、燃焼ガスの再循環が促進され、スモークを押さえつつ
及び窒素酸化物の低減を図ることができる。In the embodiment shown in FIG. 5, a plurality of sets of rod-shaped protrusions 1 are provided on the bottom surface of the combustion chamber 7 and in the vicinity of the wall surface 11.
5 and 16 are disposed, and the fuel from the nozzle 6a is directed to the protrusion 15.
, 16. When the spray passes between the protrusions 15 and 16, the pressure on the nozzle hole side of the protrusions 15 and 16 decreases, making it easier for flames to be engulfed, promoting recirculation of combustion gas, suppressing smoke and reducing nitrogen oxidation. It is possible to reduce the amount of material used.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、ピ
ストンの頂部に形成される燃焼室と、シリンダヘッドに
配設される燃料噴射弁とを有し、該燃料噴射弁のノズル
に対向して燃焼室の底面に突出部を形成すると共に、前
記燃焼室の底面または壁面に複数の突起部を形成し、該
突起部の間に燃料を噴射することにより、燃焼初期にお
いては空気の導入を抑え、着火後は既燃ガスの導入を促
進させるように燃焼室の構造を改善したため、スモーク
及び窒素酸化物の低減を図ることができる。とくに、Ｅ
ＧＲと比較して燃費の悪化が少なく、部品の耐久性及び
信頼性に優れ、また、特別の装置および改造が不要でコ
ストを低減できる。As explained above, the present invention has a combustion chamber formed at the top of the piston and a fuel injection valve disposed in the cylinder head, and is arranged opposite to the nozzle of the fuel injection valve. By forming a protrusion on the bottom of the combustion chamber, and forming a plurality of protrusions on the bottom or wall of the combustion chamber, and injecting fuel between the protrusions, air can be introduced at the early stage of combustion. The structure of the combustion chamber has been improved to suppress the amount of combustion and promote the introduction of burnt gas after ignition, making it possible to reduce smoke and nitrogen oxides. In particular, E
Compared to GR, it has less deterioration in fuel efficiency, has excellent parts durability and reliability, and requires no special equipment or modification, reducing costs.
【図１】本発明の直接噴射式ディーゼル機関の燃焼室の
１実施例を示し、（Ａ）は平面図、（Ｂ）は断面図FIG. 1 shows one embodiment of a combustion chamber of a direct injection diesel engine according to the present invention, in which (A) is a plan view and (B) is a cross-sectional view.
【図
２】本発明の直接噴射式ディーゼル機関の燃焼室の１実
施例を示し、（Ａ）は平面図、（Ｂ）は断面図FIG. 2 shows one embodiment of the combustion chamber of the direct injection diesel engine of the present invention, in which (A) is a plan view and (B) is a cross-sectional view.
【図３】
本発明の直接噴射式ディーゼル機関の燃焼室の１実施例
を示し、（Ａ）は平面図、（Ｂ）は断面図、（Ｃ）は（
Ａ）図のＣ−Ｃ線に沿う断面図[Figure 3]
One embodiment of the combustion chamber of the direct injection diesel engine of the present invention is shown, (A) is a plan view, (B) is a sectional view, and (C) is (
A) Cross-sectional view along line C-C in the figure
【図４】本発明の直接噴
射式ディーゼル機関の燃焼室の他の実施例を示し、（Ａ
）は平面図、（Ｂ）は断面図FIG. 4 shows another embodiment of the combustion chamber of the direct injection diesel engine of the present invention, (A
) is a plan view, (B) is a cross-sectional view
【図５】本発明の直接噴射
式ディーゼル機関の燃焼室の他の実施例を示し、（Ａ）
は平面図、（Ｂ）は断面図FIG. 5 shows another embodiment of the combustion chamber of the direct injection diesel engine of the present invention, (A)
is a plan view, (B) is a cross-sectional view
１…ピストン、５…シリンダヘッド、６…燃料噴射弁、
６ａ…ノズル、７…燃焼室、９…突出部、１１…壁面、
１２、１３、１５、１６…突起部、１２ａ…窪み。1...Piston, 5...Cylinder head, 6...Fuel injection valve,
6a...Nozzle, 7...Combustion chamber, 9...Protrusion, 11...Wall surface,
12, 13, 15, 16... protrusion, 12a... depression.
Claims (4)
リンダヘッドに配設される燃料噴射弁とを有し、該燃料
噴射弁のノズルに対向して燃焼室の底面に突出部を形成
すると共に、前記燃焼室の底面または壁面に複数の突起
部を形成し、該突起部の間に燃料を噴射することを特徴
とする直接噴射式ディーゼル機関の燃焼室。Claim 1: A combustion chamber comprising a combustion chamber formed at the top of a piston and a fuel injection valve disposed in a cylinder head, and a protrusion formed on the bottom surface of the combustion chamber facing the nozzle of the fuel injection valve. A combustion chamber for a direct injection diesel engine, characterized in that a plurality of protrusions are formed on the bottom or wall of the combustion chamber, and fuel is injected between the protrusions.
窪みを有する曲面形状の突起部であることを特徴とする
請求項１に記載の直接噴射式ディーゼル機関の燃焼室。2. The combustion chamber of a direct injection diesel engine according to claim 1, wherein the protrusion is a curved protrusion having a depression at the root of the wall surface of the combustion chamber.
向に延びるプレート形状の突起部であることを特徴とす
る請求項１に記載の直接噴射式ディーゼル機関の燃焼室
。3. The combustion chamber of a direct injection diesel engine according to claim 1, wherein the protrusion is a plate-shaped protrusion extending radially from a wall surface of the combustion chamber.
れるロッド形状の突起部であることを特徴とする請求項
１に記載の直接噴射式ディーゼル機関の燃焼室。4. The combustion chamber of a direct injection diesel engine according to claim 1, wherein the protrusion is a rod-shaped protrusion provided on a bottom surface of the combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2408346A JP2653556B2 (en) | 1990-12-27 | 1990-12-27 | Combustion chamber of direct injection diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2408346A JP2653556B2 (en) | 1990-12-27 | 1990-12-27 | Combustion chamber of direct injection diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04228821A true JPH04228821A (en) | 1992-08-18 |
| JP2653556B2 JP2653556B2 (en) | 1997-09-17 |
Family
ID=18517809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2408346A Expired - Lifetime JP2653556B2 (en) | 1990-12-27 | 1990-12-27 | Combustion chamber of direct injection diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653556B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0693864A (en) * | 1992-09-16 | 1994-04-05 | Shinnenshiyou Syst Kenkyusho:Kk | Combustion chamber of direct injection diesel engine |
| WO2007128446A1 (en) * | 2006-05-04 | 2007-11-15 | Daimler Ag | Method for operating an internal combustion engine and internal combustion engine for such a method |
| JP2009150361A (en) * | 2007-12-21 | 2009-07-09 | Mitsubishi Motors Corp | Piston for direct injection type diesel engine |
| EP2112348A3 (en) * | 2008-04-23 | 2010-01-06 | Honda Motor Co., Ltd. | Direct fuel injection engine |
| JP2013519834A (en) * | 2010-02-18 | 2013-05-30 | ボルボ テクノロジー コーポレイション | Piston arranged to reciprocate in the combustion engine cylinder |
| JP2016186255A (en) * | 2015-03-27 | 2016-10-27 | いすゞ自動車株式会社 | Combustion chamber structure for direct-injection engine |
| KR102097967B1 (en) * | 2018-12-07 | 2020-04-07 | 현대자동차 주식회사 | Piston combustion chamber structure of engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53134105A (en) * | 1977-04-28 | 1978-11-22 | Daihatsu Motor Co Ltd | Direct injection diesel engine |
| JPS56127326U (en) * | 1980-02-25 | 1981-09-28 | ||
| JPS62122129U (en) * | 1986-01-24 | 1987-08-03 | ||
| JPH01134730U (en) * | 1988-03-09 | 1989-09-14 | ||
| JPH03149314A (en) * | 1989-11-06 | 1991-06-25 | Yanmar Diesel Engine Co Ltd | Combustion chamber of direct injection type diesel engine |
-
1990
- 1990-12-27 JP JP2408346A patent/JP2653556B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53134105A (en) * | 1977-04-28 | 1978-11-22 | Daihatsu Motor Co Ltd | Direct injection diesel engine |
| JPS56127326U (en) * | 1980-02-25 | 1981-09-28 | ||
| JPS62122129U (en) * | 1986-01-24 | 1987-08-03 | ||
| JPH01134730U (en) * | 1988-03-09 | 1989-09-14 | ||
| JPH03149314A (en) * | 1989-11-06 | 1991-06-25 | Yanmar Diesel Engine Co Ltd | Combustion chamber of direct injection type diesel engine |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0693864A (en) * | 1992-09-16 | 1994-04-05 | Shinnenshiyou Syst Kenkyusho:Kk | Combustion chamber of direct injection diesel engine |
| WO2007128446A1 (en) * | 2006-05-04 | 2007-11-15 | Daimler Ag | Method for operating an internal combustion engine and internal combustion engine for such a method |
| US7942126B2 (en) | 2006-05-04 | 2011-05-17 | Daimler Ag | Method for operating an internal combustion engine and internal combustion engine for such a method |
| JP2009150361A (en) * | 2007-12-21 | 2009-07-09 | Mitsubishi Motors Corp | Piston for direct injection type diesel engine |
| EP2112348A3 (en) * | 2008-04-23 | 2010-01-06 | Honda Motor Co., Ltd. | Direct fuel injection engine |
| JP2013519834A (en) * | 2010-02-18 | 2013-05-30 | ボルボ テクノロジー コーポレイション | Piston arranged to reciprocate in the combustion engine cylinder |
| US9027529B2 (en) | 2010-02-18 | 2015-05-12 | Volvo Technology Corporation | Piston positioned for reciprocal movement in a combustion engine cylinder |
| JP2016186255A (en) * | 2015-03-27 | 2016-10-27 | いすゞ自動車株式会社 | Combustion chamber structure for direct-injection engine |
| KR102097967B1 (en) * | 2018-12-07 | 2020-04-07 | 현대자동차 주식회사 | Piston combustion chamber structure of engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2653556B2 (en) | 1997-09-17 |
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