JPH08121171A - Combustion chamber for direct injection type diesel engine - Google Patents
Combustion chamber for direct injection type diesel engineInfo
- Publication number
- JPH08121171A JPH08121171A JP6267078A JP26707894A JPH08121171A JP H08121171 A JPH08121171 A JP H08121171A JP 6267078 A JP6267078 A JP 6267078A JP 26707894 A JP26707894 A JP 26707894A JP H08121171 A JPH08121171 A JP H08121171A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- center
- projection
- offset
- 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.)
- Pending
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
- F02B23/0645—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
- F02B23/0672—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
- 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
- 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
- F02B23/066—Details related to the fuel injector or the fuel spray the injector being located substantially off-set from the cylinder centre 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
- 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、二弁式等の直噴式ディ
ーゼル機関の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 such as a two-valve type.
【０００２】[0002]
【従来の技術】一般に直噴式ディーゼル機関の燃焼室に
は、ピストン頂部に形成したキャビティ内において燃料
の噴霧と空気との混合を促進させるために、吸気ポート
として燃焼用空気（吸気）の旋回流を生成するスワール
ポートが備えられている。そして図５に示すように、旋
回流の弱い部分となるキャビティ１の中央に突起２を設
けてこの部分を埋め、キャビティ１内の空気利用率の向
上を図る構成が提案されている（例えば特開平２−２４
５４１８号公報）。このキャビティ１に燃料を噴射する
ための燃料噴射ノズル３は、シリンダヘッドにおける吸
排気弁（図示せず）とのレイアウトの関係でオフセット
されており、これに伴ってキャビティ１もシリンダ中心
（ピストン４の軸心）Ｏ1 から偏位されている。2. Description of the Related Art Generally, in a combustion chamber of a direct injection type diesel engine, a swirling flow of combustion air (intake air) is used as an intake port in order to promote mixing of fuel spray and air in a cavity formed at the top of a piston. Is equipped with a swirl port. Then, as shown in FIG. 5, a configuration has been proposed in which a protrusion 2 is provided in the center of the cavity 1 which is a portion where the swirl flow is weak and the portion is filled to improve the air utilization rate in the cavity 1 (for example, a special feature). Kaihei 2-24
5418). The fuel injection nozzle 3 for injecting fuel into the cavity 1 is offset due to the layout relationship with the intake / exhaust valve (not shown) in the cylinder head. Is deviated from O 1 .
【０００３】[0003]
【発明が解決しようとする課題】ところで上記構成の燃
焼室においては、燃料噴射ノズル３の各噴口からキャビ
ティ内壁までの距離は、オフセット側（シリンダ中心Ｏ
1 から遠い部分）１ａがその反対側（シリンダ中心Ｏ1
に近い部分）１ｂよりも短くなる。このため図５に示し
たように、噴射された燃料噴霧はオフセット側１ａの噴
霧ｆa が反対側１ｂの噴霧ｆb よりも早く突起２に到達
し、突起外周面に沿って巻き上がることになる。この時
の巻き上げエネルギーもオフセット側１ａの方が大きく
なって、空気との混合が各噴霧間で不均一となり、キャ
ビティ１内の混合気の濃さにむらが生じて、ＮＯｘ，ス
モークが悪化するという問題があった。By the way, in the combustion chamber having the above structure, the distance from each injection port of the fuel injection nozzle 3 to the inner wall of the cavity is on the offset side (cylinder center O).
1 from a far portion) 1a is the opposite side (cylinder center O 1
(Portion close to 1) becomes shorter than 1b. Therefore, as shown in FIG. 5, in the injected fuel spray, the spray f a on the offset side 1 a reaches the projection 2 earlier than the spray f b on the opposite side 1 b and rolls up along the outer peripheral surface of the projection. Become. At this time, the winding energy also becomes larger on the offset side 1a, the mixing with air becomes non-uniform between the sprays, and the concentration of the air-fuel mixture in the cavity 1 becomes uneven, resulting in deterioration of NOx and smoke. There was a problem.
【０００４】また図３に示すように、シリンダ中心Ｏ1
とキャビティ５の中心Ｏ2 とが一致している燃焼室にお
いては、キャビティ５内の旋回流の速度ｖは一様なもの
となるが、図４に示すように、シリンダ中心Ｏ1 からキ
ャビティ６の中心Ｏ2 をオフセットさせた燃焼室におい
ては、オフセット側の旋回流の速度ｖa が速く、反対側
の旋回流の速度ｖb が遅くなってしまうため（ｖa ＞ｖ
b ）、混合気濃度の不均一性がさらに増長してしまう。Further, as shown in FIG. 3, the cylinder center O 1
And in the combustion chamber and the center O 2 of the cavity 5 are matched, the speed v of the swirling flow in the cavity 5 becomes a thing uniform, as shown in FIG. 4, the cavity from the cylinder center O 1 6 in the combustion chamber the center O 2 is offset, fast speed v a of the offset side of the swirling flow, since the velocity v b opposite to the swirling flow is delayed (v a> v
b ), the non-uniformity of air-fuel mixture concentration is further increased.
【０００５】そこで本発明は、上記事情に鑑み、燃料と
空気との混合を均一化できる直噴式ディーゼル機関の燃
焼室を提供すべく創案されたものである。Therefore, in view of the above circumstances, the present invention was devised to provide a combustion chamber of a direct injection type diesel engine capable of uniformizing the mixing of fuel and air.
【０００６】[0006]
【課題を解決するための手段】本発明は、シリンダ中心
から偏位されてピストン頂部に形成されたキャビティの
中央に突起を設け、突起のシリンダ中心から遠い側に、
突起上部からキャビティ底面へ滑らかに連なる傾斜面部
を形成すると共に、シリンダ中心に近い側の突起上部
に、キャビティ側壁面に対向するリップを形成したもの
である。According to the present invention, a protrusion is provided in the center of a cavity formed at the top of a piston, which is offset from the center of a cylinder, and the protrusion is located farther from the center of the cylinder.
An inclined surface portion that smoothly extends from the upper portion of the protrusion to the bottom surface of the cavity is formed, and a lip that faces the side wall surface of the cavity is formed on the upper portion of the protrusion near the center of the cylinder.
【０００７】[0007]
【作用】上記構成によって、リップは、キャビティのシ
リンダ中心に近い部分において速度が小さい旋回流を保
存すると共に、このキャビティ内に噴射された燃料を溜
まりやすくする。傾斜面部は、旋回流の速度が大きいキ
ャビティ部分において噴射された燃料を流出しやすく
し、その流出した混合気を反対側へ流れ込ませる。これ
らの作用が、キャビティ内における混合気濃度の偏りを
解消する。With the above structure, the lip preserves the swirling flow having a low velocity in the portion of the cavity near the center of the cylinder, and facilitates the accumulation of the fuel injected into the cavity. The inclined surface portion makes it easier for the fuel injected in the cavity portion where the swirling flow velocity is high, to flow out, and allows the discharged mixture to flow into the opposite side. These actions eliminate the bias of the air-fuel mixture concentration in the cavity.
【０００８】[0008]
【実施例】以下、本発明の実施例を添付図面に従って説
明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００９】図１及び図２は、本発明に係わる直噴式デ
ィーゼル機関の燃焼室の一実施例を示したものである。
この燃焼室は、シリンダ中心（シリンダ１１及びピスト
ン１２の軸心）Ｏ1 から偏位されてピストン頂部２５に
形成されたキャビティ１３によって区画されているもの
であって、キャビティ１３の中央に突起１４が設けられ
ていると共に、この突起１４のシリンダ中心Ｏ1 から遠
い側であるオフセット側に傾斜面部１５が、シリンダ中
心Ｏ1 に近い側であるオフセット反対側にリップ１６
が、それぞれ形成されている。1 and 2 show an embodiment of a combustion chamber of a direct injection type diesel engine according to the present invention.
The combustion chamber is defined by a cavity 13 formed in the piston top portion 25, which is offset from the cylinder center (axial center of the cylinder 11 and the piston 12) O 1, and has a projection 14 at the center of the cavity 13. Is provided, the inclined surface portion 15 is provided on the offset side, which is the side farther from the cylinder center O 1 , of the projection 14, and the lip 16 is provided on the opposite side, which is the side closer to the cylinder center O 1.
Are formed respectively.
【００１０】キャビティ１３は、五個の噴口１７を有し
て成る燃料噴射ノズル１８のオフセットと同じ方向に偏
位されている。すなわち燃料噴射ノズル１８は、吸気バ
ルブ及び排気バルブ（図示せず）から適宜隔てられてシ
リンダヘッド１９に設置されており、本実施例にあって
は、キャビティ１３の中心Ｏ2 が、シリンダ中心Ｏ1 と
燃料噴射ノズル１８の先端２０の位置との略中間に位置
するように配置されている。キャビティ１３の形状は平
面視円形で成り、その開口縁に沿って、キャビティ中心
Ｏ2 に向かって適宜突出した棚部２１が形成されてい
る。The cavity 13 is offset in the same direction as the offset of the fuel injection nozzle 18 having five injection holes 17. That is, the fuel injection nozzle 18 is installed in the cylinder head 19 while being appropriately separated from the intake valve and the exhaust valve (not shown). In the present embodiment, the center O 2 of the cavity 13 is the cylinder center O 2. It is arranged so as to be located approximately in the middle between 1 and the position of the tip 20 of the fuel injection nozzle 18. The shape of the cavity 13 is circular in a plan view, and a shelf portion 21 that appropriately protrudes toward the center O 2 of the cavity is formed along the opening edge.
【００１１】突起１４は、略截頭円錐形状を呈し、その
下方部分はキャビティ１３の底面２２及び側壁面２３に
かけて湾曲面となって連続している。そして傾斜面部１
５は、垂直に近い円錐傾斜面として形成されており、突
起上面２４からキャビティ底面２２まで滑らかに連なる
ように傾斜している。突起上面２４はピストン上死点に
おいて燃料噴射ノズル１８の先端２０と適宜距離だけ隔
てられるように、ピストン頂部２５の面よりも低くなっ
ている。またリップ１６は、突起上面１４がシリンダ中
心Ｏ1 に向かって延出されるような形状で、キャビティ
側壁面２３に対向して所定の長さだけ突出されている。
リップ１６の突出長さはシリンダ中心Ｏ1 の位置で最大
であり、オフセット側へ行くに従って順次小さくなっ
て、リップ１６のない傾斜面部１５に連続している。The protrusion 14 has a substantially frustoconical shape, and its lower portion is continuous with a curved surface extending from the bottom surface 22 and the side wall surface 23 of the cavity 13. And the inclined surface part 1
5 is formed as a conical inclined surface that is nearly vertical, and is inclined so as to smoothly connect from the projection upper surface 24 to the cavity bottom surface 22. The upper surface 24 of the protrusion is lower than the surface of the piston top portion 25 so as to be separated from the tip 20 of the fuel injection nozzle 18 by an appropriate distance at the piston top dead center. The lip 16 has a shape such that the upper surface 14 of the protrusion extends toward the center O 1 of the cylinder, and projects a predetermined length so as to face the side wall surface 23 of the cavity.
The protruding length of the lip 16 is maximum at the position of the center O 1 of the cylinder, decreases gradually toward the offset side, and continues to the inclined surface portion 15 without the lip 16.
【００１２】このほか燃料噴射ノズル１８の噴口１７
は、周方向に等間隔に設けられ、そのうちの一つの噴口
１７B は略シリンダ中心Ｏ1 に向けられている。In addition, the injection port 17 of the fuel injection nozzle 18
Are provided at equal intervals in the circumferential direction, and one of the injection ports 17 B is directed substantially at the cylinder center O 1 .
【００１３】次に本実施例の作用を説明する。Next, the operation of this embodiment will be described.
【００１４】機関の吸入工程において、シリンダ１１内
には、図２中矢印Ｓで示した方向に旋回流が形成され
る。キャビティ１３内のオフセット反対側の部分１３B
では、シリンダ中心Ｏ1 に近いために旋回流の速度は小
さいが、キャビティ側壁面２３とリップ１３を有した突
起１４とにより囲まれる形で保存されて、実質的に旋回
流が強められる。またキャビティ１３内に噴射された燃
料は、オフセット反対側の部分１３B では溜まりやすく
なり、オフセット側の部分１３A では傾斜面部１５によ
りオフセット反対側へ流出しやすくなる。図中の矢印
Ａ，Ｂは、燃料噴射ノズル１８の各噴口１７から噴射さ
れた噴霧Ｆの動きをそれぞれ概念的に示したものであ
る。このうち、最もオフセット側の噴口から噴射された
噴霧Ｆ1 及びその両側の噴霧Ｆ2 ，Ｆ3 は、キャビティ
１３の側壁面２３に到達した後、その湾曲面に沿ってキ
ャビティ底面２２から傾斜面部１５に沿うようにして上
昇し、且つ旋回流に乗って拡散し、その一部が反対側の
部分１３B へと流れ込む（Ａ1 ，Ａ2 ，Ａ3 ）。一方最
もオフセット反対側の噴口１７B から噴射された噴霧Ｆ
4 及びその旋回流上流側の噴霧Ｆ5 は、キャビティ１３
の側壁面２３に到達した後、保存された旋回流により下
流側に拡散し、且つ棚部２１及びリップ１６により形成
されるスキッシュに乗って反転するように動いて空気と
よく混合する（Ｂ1 ，Ｂ2 ）。空気と混合したこれら噴
霧Ｆ1 …Ｆ5 は直ちに蒸気化されて自発着火され、その
火焔が伝播されて燃焼が行われる。In the intake stroke of the engine, a swirl flow is formed in the cylinder 11 in the direction indicated by the arrow S in FIG. Offset portion 13 B inside cavity 13
Since the velocity of the swirling flow is small because it is close to the cylinder center O 1 , the swirling flow is substantially surrounded by the cavity side wall surface 23 and the protrusion 14 having the lip 13, and the swirling flow is substantially strengthened. Further, the fuel injected into the cavity 13 is likely to accumulate in the portion 13 B on the offset opposite side, and tends to flow out to the offset opposite side by the inclined surface portion 15 in the offset side portion 13 A. Arrows A and B in the figure conceptually show the movement of the spray F injected from each injection port 17 of the fuel injection nozzle 18. Of these, the spray F 1 and the sprays F 2 and F 3 on both sides of the spray F 1 injected from the most offset side injection port reach the side wall surface 23 of the cavity 13, and then along the curved surface from the cavity bottom surface 22 to the inclined surface portion. 15 rises along 15 and diffuses along with the swirling flow, and a part thereof flows into the part 13 B on the opposite side (A 1 , A 2 , A 3 ). On the other hand, the spray F sprayed from the spray port 17 B on the opposite side of the offset
4 and the spray F 5 on the upstream side of the swirling flow are
After reaching the side wall surface 23, the stored swirling flow diffuses to the downstream side, and moves so as to invert on the squish formed by the shelf 21 and the lip 16 and mix well with air (B 1 , B 2 ). These sprays F 1 ... F 5 mixed with air are immediately vaporized and spontaneously ignited, and the flame is propagated and burned.
【００１５】このように、オフセットされたキャビティ
１３の中央に突起１４を設け、そのオフセット側になだ
らかな傾斜面部１５を、オフセット反対側にリップ１６
を形成したので、旋回流が弱いオフセット反対側におい
ても噴霧Ｆの動きを活発にでき、しかもオフセット側の
混合気の一部が反対側に流入するので、燃料と空気との
混合がキャビティ１３内で均一となり、混合気濃度の偏
りが改善される。すなわち均一で良好な燃焼が得られ、
ＮＯｘ，スモークの低減が達成される。As described above, the protrusion 14 is provided at the center of the offset cavity 13, the gently inclined surface portion 15 is provided on the offset side, and the lip 16 is provided on the opposite side of the offset.
As a result, the movement of the spray F can be activated even on the opposite side of the offset where the swirling flow is weak, and a part of the air-fuel mixture on the offset side flows into the opposite side. In this case, the concentration becomes uniform, and the deviation of the mixture concentration is improved. That is, uniform and good combustion is obtained,
Reduction of NOx and smoke is achieved.
【００１６】なお傾斜面部としては直線状の傾斜として
も湾曲面としてもよい。また突起の上面は平坦面に限ら
ず丸みを帯びた形状としてもよい。さらに燃料噴射ノズ
ルの噴口の数及び方向は図示例に限らず、他の設計条件
等を勘案して適宜選択すべきものである。The inclined surface portion may be a linear inclination or a curved surface. Further, the upper surface of the protrusion is not limited to a flat surface and may have a rounded shape. Furthermore, the number and direction of the injection ports of the fuel injection nozzle are not limited to the illustrated example, and should be appropriately selected in consideration of other design conditions and the like.
【００１７】[0017]
【発明の効果】以上要するに本発明によれば、燃料と空
気との混合を均一化でき、燃焼を改善できるという優れ
た効果を発揮する。In summary, according to the present invention, the excellent effect that the mixing of fuel and air can be made uniform and combustion can be improved is exhibited.
【図１】本発明に係わる直噴式ディーゼル機関の燃焼室
の一実施例を示した側断面図である。FIG. 1 is a side sectional view showing an embodiment of a combustion chamber of a direct injection diesel engine according to the present invention.
【図２】図１の平面図である。FIG. 2 is a plan view of FIG.
【図３】従来の直噴式ディーゼル機関の燃焼室を示した
平面図である。FIG. 3 is a plan view showing a combustion chamber of a conventional direct injection diesel engine.
【図４】従来の他の燃焼室における課題を説明するため
の平面図である。FIG. 4 is a plan view for explaining a problem in another conventional combustion chamber.
【図５】従来の他の燃焼室を示した側断面図である。FIG. 5 is a side sectional view showing another conventional combustion chamber.
１３ キャビティ １４ 突起 １５ 傾斜面部 １６ リップ ２２ キャビティ底面 ２３ キャビティ側壁面 ２４ 突起上面（突起上部） ２５ ピストン頂部 Ｏ1 シリンダ中心 Ｏ2 キャビティ中心13 Cavity 14 Protrusion 15 Sloping Surface 16 Lip 22 Cavity Bottom 23 Cavity Side Wall 24 Protrusion Top (Protrusion Top) 25 Piston Top O 1 Cylinder Center O 2 Cavity Center
Claims (1)
部に形成されたキャビティの中央に突起を設け、突起の
シリンダ中心から遠い側に、突起上部からキャビティ底
面へ滑らかに連なる傾斜面部を形成すると共に、シリン
ダ中心に近い側の突起上部に、キャビティ側壁面に対向
するリップを形成したことを特徴とする直噴式ディーゼ
ル機関の燃焼室。1. A protrusion is provided in the center of a cavity formed at the top of the piston and offset from the center of the cylinder, and an inclined surface portion is formed on the side of the protrusion far from the center of the cylinder so as to smoothly extend from the top of the protrusion to the bottom of the cavity. A combustion chamber for a direct injection diesel engine, characterized in that a lip facing the side wall surface of the cavity is formed on the upper portion of the protrusion near the center of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6267078A JPH08121171A (en) | 1994-10-31 | 1994-10-31 | Combustion chamber for direct injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6267078A JPH08121171A (en) | 1994-10-31 | 1994-10-31 | Combustion chamber for direct injection type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08121171A true JPH08121171A (en) | 1996-05-14 |
Family
ID=17439730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6267078A Pending JPH08121171A (en) | 1994-10-31 | 1994-10-31 | Combustion chamber for direct injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08121171A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030037505A (en) * | 2001-11-06 | 2003-05-14 | 현대자동차주식회사 | Combustion chamber structure |
| KR20040046102A (en) * | 2002-11-26 | 2004-06-05 | 현대자동차주식회사 | Combustion chamber of diesel engine |
| FR2860043A1 (en) | 2003-09-22 | 2005-03-25 | Renault Sa | Piston for e.g. combustion chamber of compression ignition internal combustion engine, has bowl presenting central spigot having protrusion extending towards wall and bottom of bowl such that fuel spray swirls without any deposit |
| FR2880384A1 (en) * | 2004-12-30 | 2006-07-07 | Renault Sas | Direct injection type internal combustion engine for motor vehicle, has boss with hollowed zone defined by concave surface extending on angular sector corresponding to that of injection layer comprising unbalanced jets of shorter length |
| EP2133535A1 (en) * | 2007-04-06 | 2009-12-16 | Honda Motor Co., Ltd. | Direct fuel-injection engine |
-
1994
- 1994-10-31 JP JP6267078A patent/JPH08121171A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030037505A (en) * | 2001-11-06 | 2003-05-14 | 현대자동차주식회사 | Combustion chamber structure |
| KR20040046102A (en) * | 2002-11-26 | 2004-06-05 | 현대자동차주식회사 | Combustion chamber of diesel engine |
| FR2860043A1 (en) | 2003-09-22 | 2005-03-25 | Renault Sa | Piston for e.g. combustion chamber of compression ignition internal combustion engine, has bowl presenting central spigot having protrusion extending towards wall and bottom of bowl such that fuel spray swirls without any deposit |
| FR2880384A1 (en) * | 2004-12-30 | 2006-07-07 | Renault Sas | Direct injection type internal combustion engine for motor vehicle, has boss with hollowed zone defined by concave surface extending on angular sector corresponding to that of injection layer comprising unbalanced jets of shorter length |
| EP1683950A1 (en) * | 2004-12-30 | 2006-07-26 | Renault | Internal combustion engine having a piston with projection in the combustion bowl foreseen with a deepened zone |
| EP2133535A1 (en) * | 2007-04-06 | 2009-12-16 | Honda Motor Co., Ltd. | Direct fuel-injection engine |
| EP2133535A4 (en) * | 2007-04-06 | 2010-09-22 | Honda Motor Co Ltd | Direct fuel-injection engine |
| US8474431B2 (en) | 2007-04-06 | 2013-07-02 | Honda Motor Co., Ltd. | Direct fuel-injected engine |
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