JP2011196213A - Direct injection type combustion chamber of diesel engine - Google Patents

Direct injection type combustion chamber of diesel engine Download PDF

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JP2011196213A
JP2011196213A JP2010062375A JP2010062375A JP2011196213A JP 2011196213 A JP2011196213 A JP 2011196213A JP 2010062375 A JP2010062375 A JP 2010062375A JP 2010062375 A JP2010062375 A JP 2010062375A JP 2011196213 A JP2011196213 A JP 2011196213A
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fuel
cavity
injection
fuel injection
axis
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Masao Okazaki
正夫 岡崎
Akira Iwasaki
明 岩崎
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Kubota Corp
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    • 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
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Abstract

PROBLEM TO BE SOLVED: To provide a direct injection type combustion chamber of a diesel engine that can equalize a vaporization state of fuel inside a cavity at a time of fuel injection.SOLUTION: For the central axis 5a of a fuel injector 5 to incline with respect to a cylinder central axis 1a and, at the time of fuel injection from each of a plurality of fuel injection holes 6, each of a plurality of injection axes 6a to orient toward the inner surface of a cavity 3, narrow angles of a tip-end extended line 5b of the central axis 5a of the fuel injector 5 with the injection axes 6a of the fuel injection holes 6 are set to be the same with each other. The inner bottom surface 3a of the cavity 3 is inclined to face a direction orthogonal to the tip-end extended line 5b of the central axis 5a of the fuel injector 5, so that, at the time of the fuel injection from the respective fuel injection holes 6, each of the injection axes 6a orients toward the inner bottom surface 3a of the cavity 3.

Description

本発明は、ディーゼルエンジンの直接噴射式燃焼室に関し、詳しくは、燃料噴射時のキャビティ内での燃料の気化状態を均一化することができるディーゼルエンジンの直接噴射式燃焼室に関する。   The present invention relates to a direct injection combustion chamber of a diesel engine, and more particularly, to a direct injection combustion chamber of a diesel engine capable of uniformizing a fuel vaporization state in a cavity during fuel injection.

従来、ディーゼルエンジンの直接噴射式燃焼室として、シリンダ内にピストンを摺動自在に内嵌させ、ピストンの頂部にキャビティを設け、シリンダヘッドに燃料インジェクタを配置し、燃料インジェクタの先端部に周方向に所定間隔を保持して複数の燃料噴射孔を設けたものがある。
この種の直接噴射式燃焼室によれば、燃料噴射孔から噴射した燃料がキャビティ内の圧縮空気の熱やキャビティの内面の熱を受け、気化して、空気と燃料の混合気が形成され、自発火が起こり、燃焼がスムーズに進行する利点がある。
しかし、この従来技術では、シリンダ中心軸線に対して燃料インジェクタの中心軸線を傾斜させ、各燃料噴射孔からの燃料噴射時に、各噴射軸線がキャビティの内面に向かうようにするに当たり、燃料インジェクタの中心軸線の先端側延長線と各燃料噴射孔の噴射軸線との挟角を、異なる角度に設定し、各燃料噴射孔からの燃料噴射時に、各噴射軸線がキャビティの内周面や内底面に向かうようにし、各燃料噴射孔からキャビティ内面までの各噴射軸線の離間距離が異なるように設定されているため、問題がある。 Conventionally, as a direct injection combustion chamber of a diesel engine, a piston is slidably fitted into a cylinder, a cavity is provided at the top of the piston, a fuel injector is disposed at the cylinder head, and a circumferential direction is provided at the tip of the fuel injector. In some cases, a plurality of fuel injection holes are provided at predetermined intervals.
According to this type of direct injection combustion chamber, the fuel injected from the fuel injection hole receives the heat of the compressed air in the cavity and the heat of the inner surface of the cavity, and is vaporized to form a mixture of air and fuel, There is an advantage that self-ignition occurs and combustion proceeds smoothly.
However, in this prior art, the center axis of the fuel injector is inclined with respect to the cylinder center axis so that each fuel injection axis is directed toward the inner surface of the cavity when fuel is injected from each fuel injection hole. The angle between the extension line on the tip end side of the axis and the injection axis of each fuel injection hole is set to a different angle, and when the fuel is injected from each fuel injection hole, each injection axis is directed to the inner peripheral surface or inner bottom surface of the cavity. Thus, there is a problem because the separation distances of the injection axes from the fuel injection holes to the inner surface of the cavity are set to be different.

特開平６−２２１１６３号公報(図１、図３参照)JP-A-6-221163 (see FIGS. 1 and 3)

《問題》 燃料噴射時のキャビティ内での燃料の気化状態が不均一になりやすい。
燃料インジェクタの中心軸線の先端側延長線と各燃料噴射孔の噴射軸線との挟角を、異なる角度に設定しているため、挟角が小さい燃料噴射孔は流通抵抗が小さい分だけ、ここから噴射される燃料は噴射速度が速く、霧化が促進されるのに対し、挟角が大きい燃料噴射孔は流通抵抗が大きい分だけ、ここから噴射される燃料は噴射速度が遅く、霧化が停滞し、各燃料噴射孔から噴射される燃料の霧化状態が不均一になる。
また、各燃料噴射孔からの燃料噴射時に、各噴射軸線がキャビティの内周面や内底面に向かうようにし、各燃料噴射孔からキャビティ内面までの各噴射軸線の離間距離が異なるように設定されているため、各燃料噴射孔から噴射される燃料がキャビティの内面から受ける熱量が不均一になる。
このように、各燃料噴射孔から噴射される燃料の霧化状態が不均一になるとともに、各燃料噴射孔から噴射される燃料がキャビティの内面から受ける熱量が不均一になるため、各燃料噴射孔から噴射される燃料の気化状態が不均一になり、燃料噴射時のキャビティ内での燃料の気化状態が不均一になりやすい。
これにより、出力低下、燃費悪化、排ガス悪化等の問題が生じる。 <Problem> The fuel vaporization state in the cavity during fuel injection tends to be uneven.
Since the angle between the extension line on the front end of the central axis of the fuel injector and the injection axis of each fuel injection hole is set to a different angle, the fuel injection hole with a small angle has a smaller flow resistance, and from here The fuel to be injected has a high injection speed and atomization is promoted, whereas the fuel injection hole with a large included angle has a large flow resistance, so that the fuel injected from here has a low injection speed and atomization does not occur. It stagnates and the atomization state of the fuel injected from each fuel injection hole becomes uneven.
In addition, when fuel is injected from each fuel injection hole, each injection axis is directed toward the inner peripheral surface or inner bottom surface of the cavity, and the separation distance of each injection axis from each fuel injection hole to the inner surface of the cavity is set to be different. Therefore, the amount of heat received by the fuel injected from each fuel injection hole from the inner surface of the cavity becomes non-uniform.
As described above, the atomization state of the fuel injected from each fuel injection hole becomes nonuniform, and the amount of heat received from the inner surface of the cavity by the fuel injected from each fuel injection hole becomes nonuniform. The state of vaporization of the fuel injected from the holes becomes nonuniform, and the state of fuel vaporization in the cavity during fuel injection tends to be nonuniform.
As a result, problems such as output reduction, fuel consumption deterioration, and exhaust gas deterioration occur.

本発明の課題は、燃料噴射時のキャビティ内での燃料の気化状態を均一化することができるディーゼルエンジンの直接噴射式燃焼室を提供することにある。   An object of the present invention is to provide a direct injection combustion chamber of a diesel engine that can uniformize the vaporization state of fuel in a cavity during fuel injection.

請求項１に係る発明の発明特定事項は、次の通りである。
図１(Ａ)〜(Ｃ)に例示するように、シリンダ(１)内にピストン(２)を摺動自在に内嵌させ、ピストン(２)の頂部にキャビティ(３)を設け、シリンダヘッド(４)に燃料インジェクタ(５)を配置し、燃料インジェクタ(５)の先端部に周方向に所定間隔を保持して複数の燃料噴射孔(６)を設けた、ディーゼルエンジンの直接噴射式燃焼室において、
図１(Ｂ)に例示するように、シリンダ中心軸線(１ａ)に対して燃料インジェクタ(５)の中心軸線(５ａ)を傾斜させ、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内面に向かうようにするに当たり、
図２(Ａ)(Ｃ)に例示するように、燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と各燃料噴射孔(６)の噴射軸線(６ａ)との挟角を、それぞれ同じ角度に設定し、
図１(Ｂ)に例示するように、キャビティ(３)の内底面(３ａ)を燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と直交する向きに傾け、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内底面(３ａ)に向かうようにした、ことを特徴とするディーゼルエンジンの直接噴射式燃焼室。 Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIGS. 1A to 1C, a piston (2) is slidably fitted in a cylinder (1), a cavity (3) is provided at the top of the piston (2), and a cylinder head is provided. Direct injection combustion of a diesel engine, in which a fuel injector (5) is arranged in (4), and a plurality of fuel injection holes (6) are provided at the tip of the fuel injector (5) at predetermined intervals in the circumferential direction. In the room
As illustrated in FIG. 1B, the center axis (5a) of the fuel injector (5) is inclined with respect to the cylinder center axis (1a), and each injection is performed at the time of fuel injection from each fuel injection hole (6). When the axis (6a) is directed toward the inner surface of the cavity (3),
As illustrated in FIGS. 2A and 2C, the tip extension line (5b) of the central axis (5a) of the fuel injector (5) and the injection axis (6a) of each fuel injection hole (6) are sandwiched. Set the corners to the same angle,
As illustrated in FIG. 1B, the inner bottom surface (3a) of the cavity (3) is tilted in a direction orthogonal to the distal end extension line (5b) of the central axis (5a) of the fuel injector (5), and each fuel is A direct injection combustion chamber of a diesel engine, wherein each injection axis (6a) is directed toward the inner bottom surface (3a) of the cavity (3) during fuel injection from the injection hole (6).

(請求項１に係る発明)
請求項１に係る発明は、次の効果を奏する。
《効果》 燃料噴射時のキャビティ内での燃料の気化状態を均一化することができる。
図２(Ａ)(Ｃ)に例示するように、燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と各燃料噴射孔(６)の噴射軸線(６ａ)との挟角を、それぞれ同じ角度に設定しているので、各燃料噴射孔(６)の流通抵抗が均一化され、各燃料噴射孔(６)から噴射される燃料の噴射速度が同程度になり、各燃料噴射孔(６)から噴射される燃料の霧化状態を均一化することができる。
また、図１(Ｂ)に例示するように、キャビティ(３)の内底面(３ａ)を燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と直交する向きに傾け、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内底面(３ａ)に向かうようにしたので、各燃料噴射孔(６)からキャビティ(３)の内底面(３ａ)までの各噴射軸線(６ａ)の離間距離が均一化され、各燃料噴射孔(６)から噴射される燃料がキャビティ(３)の内底面(３ａ)から受ける熱量を均一化することができる。
このように、各燃料噴射孔(６)から噴射される燃料の霧化状態を均一化することができるとともに、各燃料噴射孔(６)から噴射される燃料がキャビティ(３)の内底面(３ａ)から受ける熱量を均一化することができるので、燃料噴射時のキャビティ(３)内での燃料の気化状態を均一化することができる。
これにより、出力向上、燃費改善、排ガス改善を図ることができる。 (Invention of Claim 1)
The invention according to claim 1 has the following effects.
<< Effect >> The vaporization state of the fuel in the cavity at the time of fuel injection can be made uniform.
As illustrated in FIGS. 2A and 2C, the tip extension line (5b) of the central axis (5a) of the fuel injector (5) and the injection axis (6a) of each fuel injection hole (6) are sandwiched. Since the angles are set to the same angle, the flow resistance of each fuel injection hole (6) is made uniform, and the injection speed of the fuel injected from each fuel injection hole (6) becomes approximately the same. The atomization state of the fuel injected from the fuel injection hole (6) can be made uniform.
Further, as illustrated in FIG. 1B, the inner bottom surface (3a) of the cavity (3) is inclined in a direction perpendicular to the distal end side extension line (5b) of the central axis (5a) of the fuel injector (5), At the time of fuel injection from each fuel injection hole (6), each injection axis (6a) is directed toward the inner bottom surface (3a) of the cavity (3), so that from each fuel injection hole (6) to the cavity (3) The separation distance of each injection axis (6a) to the inner bottom surface (3a) is made uniform, and the amount of heat received from the inner bottom surface (3a) of the cavity (3) by the fuel injected from each fuel injection hole (6) is made uniform. can do.
In this way, the atomization state of the fuel injected from each fuel injection hole (6) can be made uniform, and the fuel injected from each fuel injection hole (6) is the inner bottom surface of the cavity (3) ( Since the amount of heat received from 3a) can be made uniform, the state of fuel vaporization in the cavity (3) during fuel injection can be made uniform.
Thereby, output improvement, fuel consumption improvement, and exhaust gas improvement can be aimed at.

本発明の実施形態に係るディーゼルエンジンの直接噴射式燃焼室を説明する図で、図１(Ａ)は横断平面図、図１(Ｂ)は図１(Ａ)のＢ−Ｂ線断面図、図１(Ｃ)は図１(Ａ)のＣ−Ｃ線断面図である。It is a figure explaining the direct injection type combustion chamber of the diesel engine which concerns on embodiment of this invention, FIG. 1 (A) is a cross-sectional top view, FIG.1 (B) is the BB sectional drawing of FIG. FIG. 1C is a cross-sectional view taken along the line CC of FIG. 図１の直接噴射式燃焼室で用いる燃料インジェクタの先端部を説明する図で、図２(Ａ)は縦断側面図、図２(Ｂ)は図２(Ａ)のＢ−Ｂ線断面図、図２(Ｃ)は図２(Ａ)のＣ−Ｃ線断面図である。2A and 2B are views for explaining a front end portion of a fuel injector used in the direct injection combustion chamber of FIG. 1, FIG. 2A is a longitudinal side view, FIG. 2B is a cross-sectional view taken along line BB in FIG. FIG. 2C is a cross-sectional view taken along the line CC of FIG.

図１〜図２は本発明の実施形態に係るディーゼルエンジンの直接噴射式燃焼室を説明する図である。   1 to 2 are views for explaining a direct injection combustion chamber of a diesel engine according to an embodiment of the present invention.

図１(Ａ)〜(Ｃ)に示すように、シリンダ(１)内にピストン(２)を摺動自在に内嵌させ、ピストン(２)の頂部にキャビティ(３)を設け、シリンダヘッド(４)に燃料インジェクタ(５)を配置し、燃料インジェクタ(５)の先端部に周方向に所定間隔を保持して複数の燃料噴射孔(６)を設けている。   As shown in FIGS. 1A to 1C, a piston (2) is slidably fitted into a cylinder (1), a cavity (3) is provided at the top of the piston (2), and a cylinder head ( 4), a fuel injector (5) is arranged, and a plurality of fuel injection holes (6) are provided at a distal end portion of the fuel injector (5) at a predetermined interval in the circumferential direction.

図１(Ａ)〜(Ｃ)に示すように、キャビティ(３)は周壁が円柱周面形状のトロイダル形であるが、開口部(３ｂ)を絞ったリエントラント形であってもよい。キャビティ(３)の開口部(３ｂ)の中心軸線(３ｃ)はシリンダ(１)の中心軸線(１ａ)から偏心させている。燃料インジェクタ(５)の先端部も、キャビティ(３)の開口部(３ｂ)の中心軸線(３ｃ)と同じ側に、シリンダ(１)の中心軸線(１ａ)から偏心させている。
図２(Ａ)〜(Ｃ)に示すように、燃料インジェクタ(５)の先端部にノズル(１０)を設け、ノズル(１０)内に開弁作動室(１１)と燃料分流室(１２)とを設け、開弁作動室(１１)と燃料分流室(１２)との境界に弁座(１３)を設け、弁座(１３)にノズルスプリング(図外)で付勢した針弁(１４)を着座させ、燃料分流室(１２)から複数の燃料噴射孔(６)を導出している。燃料噴射ポンプ(図外)から開弁作動室(１１)に燃料を圧送すると、ノズルスプリングの付勢力に抗して針弁(１４)が開弁され、燃料が開弁作動室(１１)と燃料分流室(１２)とを介して複数の燃料噴射孔(６)から同時に噴射される。
図２(Ｂ)に示すように、燃料噴射孔(６)は燃料インジェクタ(５)の先端部の全周に等間隔で複数配置し、燃料インジェクタ(５)の中心軸線(５ａ)と平行な向きに見て、燃料噴射孔(６)の噴射軸線(６ａ)は燃料インジェクタ(５)の中心軸線(５ａ)から放射する向きに向けている。具体的には、燃料噴射孔(６)は燃料インジェクタ(５)の先端部の全周に９０°毎に合計４個配置されている。 As shown in FIGS. 1 (A) to (C), the cavity (3) has a toroidal shape having a cylindrical peripheral surface, but may have a reentrant shape with a narrowed opening (3b). The central axis (3c) of the opening (3b) of the cavity (3) is eccentric from the central axis (1a) of the cylinder (1). The tip of the fuel injector (5) is also eccentric from the central axis (1a) of the cylinder (1) on the same side as the central axis (3c) of the opening (3b) of the cavity (3).
As shown in FIGS. 2 (A) to (C), a nozzle (10) is provided at the tip of the fuel injector (5), and a valve opening working chamber (11) and a fuel branch chamber (12) are provided in the nozzle (10). A valve seat (13) is provided at the boundary between the valve opening working chamber (11) and the fuel flow dividing chamber (12), and a needle valve (14) energized by a nozzle spring (not shown) is provided on the valve seat (13). ) And a plurality of fuel injection holes (6) are led out from the fuel diversion chamber (12). When fuel is pumped from the fuel injection pump (not shown) to the valve opening working chamber (11), the needle valve (14) is opened against the urging force of the nozzle spring, and the fuel is opened to the valve opening working chamber (11). The fuel is simultaneously injected from the plurality of fuel injection holes (6) through the fuel diversion chamber (12).
As shown in FIG. 2 (B), a plurality of fuel injection holes (6) are arranged at equal intervals on the entire circumference of the tip of the fuel injector (5), and are parallel to the central axis (5a) of the fuel injector (5). Looking in the direction, the injection axis (6a) of the fuel injection hole (6) is directed to radiate from the central axis (5a) of the fuel injector (5). Specifically, a total of four fuel injection holes (6) are arranged every 90 ° on the entire circumference of the tip of the fuel injector (5).

図１(Ｂ)に示すように、シリンダ中心軸線(１ａ)に対して燃料インジェクタ(５)の中心軸線(５ａ)を傾斜させ、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内面に向かうようにしている。
図２(Ａ)(Ｃ)に示すように、燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と各燃料噴射孔(６)の噴射軸線(６ａ)との挟角を、それぞれ同じ角度に設定している。
図１(Ｂ)に示すように、キャビティ(３)の内底面(３ａ)を燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と直交する向きに傾け、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内底面(３ａ)に向かうようにしている。
図１(Ａ)〜(Ｃ)中で、各噴射軸線(６ａ)の先端に示す点は、各噴射軸線(６ａ)とキャビティ(３)の内底面(３ａ)との交点である。 As shown in FIG. 1 (B), the center axis (5a) of the fuel injector (5) is inclined with respect to the cylinder center axis (1a), and each injection axis is at the time of fuel injection from each fuel injection hole (6). (6a) faces the inner surface of the cavity (3).
As shown in FIGS. 2 (A) and 2 (C), the included angle between the distal extension line (5b) of the central axis (5a) of the fuel injector (5) and the injection axis (6a) of each fuel injection hole (6). Are set at the same angle.
As shown in FIG. 1 (B), the inner bottom surface (3a) of the cavity (3) is tilted in a direction perpendicular to the distal end extension line (5b) of the central axis (5a) of the fuel injector (5), and each fuel injection At the time of fuel injection from the hole (6), each injection axis (6a) is directed toward the inner bottom surface (3a) of the cavity (3).
1A to 1C, the point shown at the tip of each injection axis 6a is the intersection of each injection axis 6a and the inner bottom surface 3a of the cavity 3.

図１(Ｂ)に示すように、シリンダ中心軸線(１ａ)に対して燃料インジェクタ(５)の中心軸線(５ａ)は６０°の角度で傾斜させ、燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と各燃料噴射孔(６)の噴射軸線(６ａ)との挟角は、３０°に設定している。
キャビティ(３)の内底面(３ａ)の中央部には***部(１５)を配置している。***部(１５)はキャビティ(３)の内底面(３ａ)の中央部から燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)に沿って***させ、燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と直交する断面形状が円形のなだらかな山形に形成している。
各燃料噴射孔(６)からの燃料噴射時には、各噴射軸線(６ａ)が、***部(１５)の周囲にあるキャビティ(３)の内底面(３ａ)に向かうようにしている。
図１(Ａ)中の矢印(１６)は、スワール吸気流である。スワール吸気流(１６)はスワール吸気ボート(図外)からの吸気の導入により、キャビティ(３)内に形成される。 As shown in FIG. 1B, the central axis (5a) of the fuel injector (5) is inclined at an angle of 60 ° with respect to the cylinder central axis (1a), and the central axis (5a) of the fuel injector (5) is inclined. The angle between the front end side extension line (5b) and the injection axis (6a) of each fuel injection hole (6) is set to 30 °.
A raised portion (15) is disposed at the center of the inner bottom surface (3a) of the cavity (3). The raised portion (15) is raised from the central portion of the inner bottom surface (3a) of the cavity (3) along the distal end side extension line (5b) of the central axis (5a) of the fuel injector (5), and the fuel injector (5) The cross-sectional shape orthogonal to the front end side extension line (5b) of the central axis (5a) is formed into a gentle mountain shape with a circular shape.
At the time of fuel injection from each fuel injection hole (6), each injection axis (6a) is directed toward the inner bottom surface (3a) of the cavity (3) around the raised portion (15).
An arrow (16) in FIG. 1 (A) indicates a swirl intake flow. A swirl intake flow (16) is formed in the cavity (3) by the introduction of intake air from a swirl intake boat (not shown).

(１) シリンダ
(１ａ) シリンダ中心軸線
(２) ピストン
(３) キャビティ
(３ａ) 内底面
(４) シリンダヘッド
(５) 燃料インジェクタ
(５ａ) 中心軸線
(５ｂ) 先端側延長線
(６) 燃料噴射孔
(６ａ) 噴射軸線 (1) Cylinder
(1a) Cylinder center axis
(2) Piston
(3) Cavity
(3a) Inner bottom
(4) Cylinder head
(5) Fuel injector
(5a) Center axis
(5b) Extension line on the tip side
(6) Fuel injection hole
(6a) Injection axis

Claims (1)

シリンダ(１)内にピストン(２)を摺動自在に内嵌させ、ピストン(２)の頂部にキャビティ(３)を設け、シリンダヘッド(４)に燃料インジェクタ(５)を配置し、燃料インジェクタ(５)の先端部に周方向に所定間隔を保持して複数の燃料噴射孔(６)を設けた、ディーゼルエンジンの直接噴射式燃焼室において、
シリンダ中心軸線(１ａ)に対して燃料インジェクタ(５)の中心軸線(５ａ)を傾斜させ、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内面に向かうようにするに当たり、
燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と各燃料噴射孔(６)の噴射軸線(６ａ)との挟角を、それぞれ同じ角度に設定し、
キャビティ(３)の内底面(３ａ)を燃料インジェクタ(５)の中心軸線(５ａ)の先端側延長線(５ｂ)と直交する向きに傾け、各燃料噴射孔(６)からの燃料噴射時に、各噴射軸線(６ａ)がキャビティ(３)の内底面(３ａ)に向かうようにした、ことを特徴とするディーゼルエンジンの直接噴射式燃焼室。
A piston (2) is slidably fitted in the cylinder (1), a cavity (3) is provided at the top of the piston (2), a fuel injector (5) is disposed on the cylinder head (4), and a fuel injector In a direct injection combustion chamber of a diesel engine in which a plurality of fuel injection holes (6) are provided at a distal end of (5) at a predetermined interval in the circumferential direction,
The center axis (5a) of the fuel injector (5) is inclined with respect to the cylinder center axis (1a), and each injection axis (6a) is connected to the inner surface of the cavity (3) when fuel is injected from each fuel injection hole (6). When going to
The angle between the extension line (5b) at the front end of the central axis (5a) of the fuel injector (5) and the injection axis (6a) of each fuel injection hole (6) is set to the same angle,
The inner bottom surface (3a) of the cavity (3) is tilted in a direction perpendicular to the extension line (5b) on the front end side of the central axis (5a) of the fuel injector (5), and at the time of fuel injection from each fuel injection hole (6), A direct injection combustion chamber of a diesel engine, characterized in that each injection axis (6a) is directed toward the inner bottom surface (3a) of the cavity (3).
JP2010062375A 2010-03-18 2010-03-18 Direct injection type combustion chamber of diesel engine Pending JP2011196213A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56150840U (en) * 1980-04-14 1981-11-12
JPS59206614A (en) * 1983-04-11 1984-11-22 フイアツト・アウト・ソシエタ・ペル・アチオ−ニ Fuel direct injection type internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56150840U (en) * 1980-04-14 1981-11-12
JPS59206614A (en) * 1983-04-11 1984-11-22 フイアツト・アウト・ソシエタ・ペル・アチオ−ニ Fuel direct injection type internal combustion engine

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