JP4217231B2 - Fuel injection device for internal combustion engine - Google Patents

Fuel injection device for internal combustion engine Download PDF

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JP4217231B2
JP4217231B2 JP2005219756A JP2005219756A JP4217231B2 JP 4217231 B2 JP4217231 B2 JP 4217231B2 JP 2005219756 A JP2005219756 A JP 2005219756A JP 2005219756 A JP2005219756 A JP 2005219756A JP 4217231 B2 JP4217231 B2 JP 4217231B2
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fuel injection
opening
forming member
injection device
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哲也 本田
雅明 川本
秀昭 片柴
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Mitsubishi Electric Corp
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Description

本発明は、内燃機関の燃料噴射装置に関する。   The present invention relates to a fuel injection device for an internal combustion engine.

従来の燃料噴射装置として、噴射孔が開口する弁体ハウジングの先端面に筒状のカバーを対向配置し、カバーには、一端がカバーの先端面に開口し、他端が弁体ハウジングの噴射孔に対応して開口するとともに弁体のニードル部の先端部を挿入し得る混合気形成孔と、一端が混合気形成孔に開口し、他端がカバーの先端面又は外周側面に開口する空気吸入路とを設けたものがある（例えば、特許文献１参照）。また、燃料を噴射する噴口の下流部分に円筒状の環状壁部を設けて開口空間を形成し、この開口空間を介して燃焼室と連通するようにしたものがある（例えば、特許文献２参照）。   As a conventional fuel injection device, a cylindrical cover is disposed opposite to a front end surface of a valve body housing in which an injection hole is opened. One end of the cover opens on the front end surface of the cover, and the other end is an injection of the valve body housing. An air-fuel mixture forming hole that can be opened corresponding to the hole and into which the tip of the needle part of the valve body can be inserted, and one end that opens to the air-fuel mixture forming hole and the other end that opens to the front end surface or the outer peripheral surface of the cover Some have a suction passage (see, for example, Patent Document 1). In addition, there is a structure in which a cylindrical annular wall portion is provided in a downstream portion of a nozzle for injecting fuel so as to form an opening space and communicate with the combustion chamber through the opening space (see, for example, Patent Document 2). ).

なお、上記混合気形成孔や環状壁部には空気を導入する空気導入孔が設けられている。筒内直噴のガソリンエンジンやディーゼルエンジンでは、燃料噴射装置が燃焼ガスによる加熱で高温になる場合があり、上記のような混合気形成孔や開口空間は、噴射され霧化した燃料の流れの改善、燃料噴射装置の温度上昇の抑制その他の目的で設けられる。   The air-fuel mixture forming hole and the annular wall portion are provided with air introduction holes for introducing air. In a direct-injection gasoline engine or diesel engine, the fuel injection device may become hot due to heating with combustion gas, and the mixture formation hole and the open space as described above are used for the flow of injected and atomized fuel. It is provided for improvement, suppression of temperature rise of the fuel injection device, and other purposes.

特開平６−１８５４３３号公報（段落番号００１０、図３及び図４）JP-A-6-185433 (paragraph number 0010, FIG. 3 and FIG. 4) 特開２００３−３９３０号公報（段落番号００６５及び図２）Japanese Patent Laying-Open No. 2003-3930 (paragraph number 0065 and FIG. 2)

従来の内燃機関の燃料噴射装置は以上のように構成され、環状壁部にて形成される開口空間は燃焼空間と連通しているが、開口空間は噴口側が閉塞されており、上記燃焼空間から凹設された部分に設けられているため、噴射期間の終盤に噴射された燃料の一部は燃焼空間に到達することなく開口空間に滞留する。滞留した燃料は、燃焼ガスによる加熱などにより熱分解するが、燃焼に必要な空気が十分供給されないため不完全燃焼して一部が炭化物となる。   A conventional fuel injection device for an internal combustion engine is configured as described above, and the opening space formed by the annular wall portion communicates with the combustion space, but the opening space is closed on the injection port side, Since it is provided in the recessed portion, part of the fuel injected at the end of the injection period stays in the open space without reaching the combustion space. The staying fuel is thermally decomposed by heating with combustion gas or the like. However, since the air necessary for combustion is not sufficiently supplied, incomplete combustion occurs and part of the fuel becomes carbide.

開口空間内で生成した炭化物の一部は燃焼空間が掃気される際にエンジンの外部に排出され、また一部は次回の燃料噴射の際に燃焼空間に押出されるが、残りは開口空間に滞留する。開口空間に滞留した炭化物は、環状壁部の内壁に付着堆積する。特に複数の噴口を設けて噴射を行う場合は、各噴口から噴射された燃料の流れと流れとの間（以下、噴射燃料流間間隙という）にいずれの噴口から噴射された燃料も通過しない澱みが生じ、噴射された燃料の一部が残留する。これに加えて、燃焼空間の掃気の影響が及ばないので、澱み部分への堆積が顕著になる。   A part of the carbide generated in the opening space is discharged to the outside of the engine when the combustion space is scavenged, and part of the carbide is pushed out to the combustion space at the next fuel injection, and the rest is opened to the opening space. Stay. The carbide staying in the open space adheres and accumulates on the inner wall of the annular wall portion. In particular, when injection is performed with a plurality of injection holes, the fuel injected from any of the injection holes does not pass between the flow of fuel injected from each injection hole (hereinafter referred to as the gap between the injection fuel flows). And a part of the injected fuel remains. In addition to this, since the influence of the scavenging of the combustion space does not reach, the accumulation on the stagnation portion becomes remarkable.

堆積した炭化物は、燃料噴射の障害物となり、燃料噴射量や噴射された燃料の流れの形状に変化をもたらすほか、堆積した炭化物が不定期に剥離するなどの影響により、燃焼特性が大幅に変動するなどの問題点があった。なお、上記混合気形成孔や環状壁部には空気を導入する導入孔が設けられているが、このような問題点を解決するために充分に機能するものではなかった。
この発明は、上記のような問題点を解決するためになされたものであり、噴口の燃料の噴出側に設けられ開口空間を形成する空間部形成部材への炭化物の堆積を抑制できる内燃機関の燃料噴射装置を得ることを目的とする。 Accumulated carbides become obstacles to fuel injection, causing changes in the fuel injection amount and the shape of the injected fuel flow, and the combustion characteristics fluctuate greatly due to the effects of accumulated carbides peeling off irregularly. There was a problem such as. In addition, although the air-fuel mixture forming hole and the annular wall portion are provided with an introduction hole for introducing air, it does not function sufficiently to solve such a problem.
The present invention has been made to solve the above-described problems, and is an internal combustion engine that can suppress the accumulation of carbide on a space forming member that is provided on the fuel ejection side of the nozzle and forms an open space. It aims at obtaining a fuel-injection apparatus.

この発明に係る内燃機関の燃料噴射装置においては、燃料が噴射される複数の噴口が一つの円周上にあるようにして先端部に配置された燃料噴射装置本体と、燃料噴射装置本体の噴口の燃料の噴出側に設けられ噴口側と反対側に開口部を有し円筒状の開口空間を形成する空間部形成部材と、空間部形成部材の内周部に噴口に隣接して噴口の数と同数の噴口側から開口部に向けて内周部における周方向の位置が変化する旋回溝を形成する溝形成部とを備えたものである。 In the fuel injection device for an internal combustion engine according to the present invention, the fuel injection device main body arranged at the tip so that a plurality of injection holes for injecting fuel are on one circumference, and the injection ports of the fuel injection device main body A space forming member that is provided on the fuel injection side and that has an opening on the side opposite to the injection port side to form a cylindrical opening space, and the number of injection holes adjacent to the injection port on the inner periphery of the space formation member And a groove forming part for forming a turning groove in which the circumferential position of the inner peripheral part changes from the same number of nozzle sides toward the opening.

この発明は、燃料が噴射される複数の噴口が一つの円周上にあるようにして先端部に配置された燃料噴射装置本体と、燃料噴射装置本体の噴口の燃料の噴出側に設けられ噴口側と反対側に開口部を有し円筒状の開口空間を形成する空間部形成部材と、空間部形成部材の内周部に噴口に隣接して噴口の数と同数の噴口側から開口部に向けて内周部における周方向の位置が変化する旋回溝を形成する溝形成部とを備えものであるので、旋回溝に沿った流れが生じ開口空間内の気体の流れが改善されて澱みが発生するのを少なくできるとともに、空間部形成部材への炭化物の堆積を抑制できる。 The present invention relates to a fuel injection device main body disposed at a front end so that a plurality of injection holes for fuel injection are on one circumference, and a fuel injection port provided on the fuel injection side of the injection port of the fuel injection device main body A space part forming member having an opening on the opposite side to form a cylindrical opening space, and adjacent to the nozzle holes on the inner peripheral part of the space part forming member from the same number of nozzle holes to the openings. And a groove forming portion that forms a swirling groove whose circumferential position in the inner circumferential portion changes, and thus a flow along the swirling groove is generated, and the flow of gas in the opening space is improved, and stagnation occurs. It can reduce generation | occurrence | production and can suppress the deposit of the carbide | carbonized_material to a space part formation member.

実施の形態１．
図１及び図２は、この発明を実施するための実施の形態１である内燃機関の燃料噴射装置を示すものであり、図１は要部の一部断面斜視図、図２は平面図である。また、図３は従来の内燃機関の燃料噴射装置における噴射燃料流を説明するための説明図である。図１及び図２において、燃料噴射装置本体１の下面に噴口２が設けられている。噴口２は、この実施の形態では円上に等間隔に６個配設されている。円筒状の燃料噴射装置本体１の下面に空間部形成部材としての開口空間形成部材３が固着されている。円筒状の開口空間形成部材３は、外径が一定の外周部３ａと傾斜した内周部３ｂを有し、図１における上方の上端部３ｃの肉厚が下方の開口部３ｄの肉厚よりも厚くされている。この開口空間形成部材３の内周部３ｂにより上端部３ｃ側から開口部３ｄ側に向かうに従いその径が次第に拡大する円錐台状の開口空間３ｅが形成されている。 Embodiment 1 FIG.
1 and 2 show a fuel injection device for an internal combustion engine according to a first embodiment for carrying out the present invention. FIG. 1 is a partially sectional perspective view of a main part, and FIG. 2 is a plan view. is there. FIG. 3 is an explanatory diagram for explaining an injected fuel flow in a conventional fuel injection device for an internal combustion engine. 1 and 2, a nozzle hole 2 is provided on the lower surface of the fuel injection device main body 1. In this embodiment, six nozzle holes 2 are arranged at equal intervals on the circle. An open space forming member 3 as a space forming member is fixed to the lower surface of the cylindrical fuel injection device main body 1. The cylindrical opening space forming member 3 has an outer peripheral portion 3a having a constant outer diameter and an inclined inner peripheral portion 3b, and the thickness of the upper upper end portion 3c in FIG. 1 is larger than the thickness of the lower opening portion 3d. It is also thickened. A frustoconical opening space 3e whose diameter gradually increases from the upper end 3c side toward the opening 3d side is formed by the inner peripheral portion 3b of the opening space forming member 3.

内周部３ｂには、各噴口２に対応して旋回溝としての溝３ｇを形成する溝形成部３ｆが６箇所設けられている。溝３ｇは、上端部３ｃにおいては燃料噴射装置本体１の中心から噴口２を通る放射線と内周部３ｂとが交わる部分を始点とし、所定のねじれ角度（溝３ｇの軌跡を径方向に外周部３ａに投影したときの影がなす角度）で図１の下方へ向かい、始点から所定角度変位したところの開口部３ｄを終点とする断面矩形の溝である。当該溝３ｇは、開口部３ｄ側から内周部３ｂを見たとき、噴口側から上記開口部に向けて溝３ｇの周方向の位置が次第に変化する旋回溝となっている。開口空間形成部材３は、例えば鉄鋼材料で精密鋳造法により製作する。 The inner peripheral portion 3b is provided with six groove forming portions 3f that form grooves 3g as turning grooves corresponding to the respective nozzle holes 2. The groove 3g starts from a portion where the radiation passing through the nozzle hole 2 from the center of the fuel injection device main body 1 and the inner peripheral portion 3b intersect at the upper end portion 3c, and has a predetermined twist angle (the trajectory of the groove 3g is the outer peripheral portion in the radial direction). This is a groove having a rectangular cross section with the opening 3d as the ending point at a position displaced from the starting point by a predetermined angle toward the lower side in FIG. 1 at an angle formed by a shadow when projected onto 3a. The groove 3g is a turning groove whose position in the circumferential direction of the groove 3g gradually changes from the nozzle side toward the opening when the inner peripheral portion 3b is viewed from the opening 3d side. The opening space forming member 3 is made of, for example, a steel material by a precision casting method.

動作の説明に先立ち、従来の内燃機関の燃料噴射装置における開口空間形成部材９３内における噴射された燃料の流れを図３について説明する。図３において、開口空間形成部材９３が噴口２を取り囲んで図１の開口空間形成部材３と同様の形状の円錐台状の開口空間９３ｅを形成している。この場合、噴口２から噴射された燃料の流れは噴射燃料流ｊのようになり、噴射燃料流ｊと噴射燃料流ｊとの間に比較的大きな澱みｋが生じやすい。   Prior to the description of the operation, the flow of injected fuel in the opening space forming member 93 in the conventional fuel injection device for an internal combustion engine will be described with reference to FIG. In FIG. 3, an opening space forming member 93 surrounds the nozzle hole 2 to form a frustoconical opening space 93e having the same shape as the opening space forming member 3 of FIG. In this case, the flow of fuel injected from the nozzle 2 becomes an injected fuel flow j, and a relatively large stagnation k tends to occur between the injected fuel flow j and the injected fuel flow j.

これに対して、この実施の形態における内燃機関の燃料噴射装置は、次のように動作する。連続した流体の場合、その流体のどの部分においても圧力エネルギーと速度エネルギーと位置エネルギーの合計が常に一定となる。位置エネルギーの差が無視できる場合、噴口２から噴射された速度エネルギーが高い燃料の周辺の圧力エネルギーが低下する。すなわち、噴射された燃料の周辺は負圧気味となり、周辺の気体を噴口２の方へ誘引する作用が生じる。   On the other hand, the fuel injection device for the internal combustion engine in this embodiment operates as follows. In the case of a continuous fluid, the sum of pressure energy, velocity energy, and potential energy is always constant in any part of the fluid. When the difference in potential energy is negligible, the pressure energy around the fuel with high velocity energy injected from the nozzle 2 decreases. That is, the periphery of the injected fuel has a negative pressure, and the effect of attracting the surrounding gas toward the nozzle 2 occurs.

開口空間形成部材３の内周部３ｂと噴口２が近接する部分では内周部３ｂに沿って周辺の気体が誘引されるが、内周部３ｂに設けた溝３ｇの作用により、誘引された気体は溝３ｇに沿った流れを形成する。上述のように溝３ｇの位置を噴射された燃料の下流側である開口部３ｄに向けて徐々に周方向に変化させて設けると、誘引された気体を図１に矢印で示すような開口空間３ｅの周方向に旋回する流れにすることができる。その結果、従来は澱み部分が形成されていた噴射燃料流間間隙の部分にも気体を流動させることができる。従って、開口空間３ｅ内において噴口２から噴射された燃料の噴射燃料流間間隙に澱みが発生するのを少なくできるとともに、内周部３ｂに炭化物が付着しても旋回流によりすぐに除去されるので炭化物の堆積を抑制できる。   In the portion where the inner peripheral portion 3b of the opening space forming member 3 and the nozzle hole 2 are close to each other, the surrounding gas is attracted along the inner peripheral portion 3b, but is attracted by the action of the groove 3g provided in the inner peripheral portion 3b. The gas forms a flow along the groove 3g. As described above, when the position of the groove 3g is gradually changed in the circumferential direction toward the opening 3d on the downstream side of the injected fuel, the attracted gas is opened as indicated by an arrow in FIG. It can be made to flow in the circumferential direction of 3e. As a result, the gas can also flow through the portion of the gap between the injected fuel flows where the stagnation portion has been conventionally formed. Accordingly, it is possible to reduce the occurrence of stagnation in the gap between the injected fuel flows of the fuel injected from the nozzle 2 in the opening space 3e, and even if carbides adhere to the inner peripheral portion 3b, they are immediately removed by the swirling flow. Therefore, the accumulation of carbide can be suppressed.

実施の形態２．
次に、この発明の実施の形態２を図４について説明する。図４は、本発明の実施の形態２の燃料噴射装置の構成を示すもので、図４（ａ）は一部断面平面図、図４（ｂ）は空気導入口形成部の拡大図である。図４において、開口空間形成部材１３の上端部１３ｃに切欠き１３ｊが設けられ、この切欠き１３ｊと噴射装置本体１とにより空気導入孔形成部１５が形成されている。空気導入孔形成部１５により、噴口２の近傍に開口空間３ｅと開口空間形成部材１３の外部の燃焼空間とを開口空間３ｅの径方向に連通する空気導入孔１６が形成されている。その他の構成については、図１に示した実施の形態１と同様のものであるので、相当するものに同じ符号を付して説明を省略する。 Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 4 shows the configuration of the fuel injection device according to the second embodiment of the present invention. FIG. 4 (a) is a partially sectional plan view, and FIG. 4 (b) is an enlarged view of an air inlet formation portion. . In FIG. 4, a notch 13 j is provided in the upper end portion 13 c of the opening space forming member 13, and the air introduction hole forming portion 15 is formed by the notch 13 j and the injection device main body 1. The air introduction hole forming portion 15 forms an air introduction hole 16 in the vicinity of the nozzle hole 2 that connects the opening space 3e and the combustion space outside the opening space forming member 13 in the radial direction of the opening space 3e. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

次に、その動作を説明する。開口空間形成部材１３の内周部３ｂに溝形成部３ｆを設けて噴射により誘引された気体を旋回させる動作は、実施の形態１と同様である。この実施の形態２においては、噴口２の近傍に開口空間３ｅの奥の方の部分と開口空間形成部材１３の外側の燃焼空間とを連通する空気導入孔１６を設けたため、高速で噴射される燃料の作用により噴口２の近傍に発生する負圧と燃焼空間との圧力差により、空気導入孔１６を通って燃焼空間の気体が開口空間３ｅ内に流入する。   Next, the operation will be described. The operation of providing the groove forming portion 3f on the inner peripheral portion 3b of the opening space forming member 13 and turning the gas attracted by the injection is the same as in the first embodiment. In the second embodiment, since the air introduction hole 16 is provided in the vicinity of the nozzle hole 2 so as to communicate the rear part of the opening space 3e and the combustion space outside the opening space forming member 13, the injection is performed at high speed. The gas in the combustion space flows into the opening space 3e through the air introduction hole 16 due to the pressure difference between the negative pressure generated in the vicinity of the nozzle hole 2 by the action of the fuel and the combustion space.

その結果、より多くの気体が溝３ｇの近傍にも誘引され、噴射された燃料の流れが一層改善され、噴射燃料流間間隙に澱みが発生するのを少なくできる。また、このように最外周に配設された噴口２に対応させて噴口２の近傍に空気導入孔１６を空気導入孔形成部１５により形成すると、空気導入孔１６から溝３ｇへ気体の流通抵抗を小さくできるので、効果的に旋回流を生じさせることができる。従って、炭化物の堆積をさらに効果的に防止できる。   As a result, more gas is attracted to the vicinity of the groove 3g, the flow of the injected fuel is further improved, and the occurrence of stagnation in the gap between the injected fuel flows can be reduced. In addition, when the air introduction hole 16 is formed by the air introduction hole forming portion 15 in the vicinity of the injection hole 2 so as to correspond to the injection hole 2 arranged on the outermost periphery in this way, the gas flow resistance from the air introduction hole 16 to the groove 3g. Therefore, a swirl flow can be effectively generated. Therefore, it is possible to more effectively prevent carbide deposition.

また、変形例として、図５の一部断面平面図に示すように、空気導入孔形成部２５により、溝３ｇの旋回方向に開口空間形成部材３の外側から開口空間３ｅに向かうような空気導入孔２６を形成すると、空気導入孔２６から溝３ｇへの気体の流れが円滑になるので、一層澱みの発生を少なくできる。従って、炭化物の堆積を一層効果的に防止できる。   Further, as a modification, as shown in the partial cross-sectional plan view of FIG. 5, the air introduction hole forming section 25 introduces the air in the turning direction of the groove 3 g from the outside of the opening space forming member 3 toward the opening space 3 e. When the hole 26 is formed, the flow of gas from the air introduction hole 26 to the groove 3g becomes smooth, so that the occurrence of stagnation can be further reduced. Therefore, it is possible to more effectively prevent carbide deposition.

さらに、他の変形例として、図６の一部断面平面図に示すように、空気導入孔３６を噴口２及び溝３ｇとは異なる放射線上の位置例えば噴口２と噴口２との中間に開口させるように空気導入孔形成部３５を構成した場合でも、噴口２及び溝３ｇ近傍への気体の供給を増加させ、噴射される燃料の流れを改善することができる。   As another modification, as shown in the partial cross-sectional plan view of FIG. 6, the air introduction hole 36 is opened at a position on the radiation different from the nozzle 2 and the groove 3g, for example, between the nozzle 2 and the nozzle 2. Even when the air introduction hole forming portion 35 is configured as described above, it is possible to increase the supply of gas to the vicinity of the injection hole 2 and the groove 3g and improve the flow of injected fuel.

なお、上記各実施の形態においては、空気導入孔形成部は開口空間形成部材の上端部に設けた切欠きと噴射装置本体とにより構成されるものを示したが、これに限られるものでなく、例えば開口空間形成部材に開口空間形成部材を径方向に貫通する貫通孔を形成する貫通孔形成部を設けたものであっても同様の効果を奏する。また、開口空間形成部材は円錐台状の開口空間を形成するものに限定されるものではなく、直線円筒状やその他の形状の開口空間を形成するものであってもよい。   In each of the above embodiments, the air introduction hole forming portion is configured by the notch provided at the upper end portion of the opening space forming member and the injection device main body. However, the present invention is not limited to this. For example, even if the opening space forming member is provided with a through hole forming portion that forms a through hole that penetrates the opening space forming member in the radial direction, the same effect can be obtained. Further, the opening space forming member is not limited to a member that forms a truncated cone-shaped opening space, and may be a member that forms a linear cylindrical shape or other shape of opening space.

この発明の実施の形態１の内燃機関の燃料噴射装置の要部を示す一部断面斜視図である。It is a partial cross section perspective view which shows the principal part of the fuel-injection apparatus of the internal combustion engine of Embodiment 1 of this invention. この発明の実施の形態１の内燃機関の燃料噴射装置の要部を示す平面図である。It is a top view which shows the principal part of the fuel-injection apparatus of the internal combustion engine of Embodiment 1 of this invention. 従来の内燃機関の燃料噴射装置における噴射燃料流を説明するための説明図である。It is explanatory drawing for demonstrating the injection fuel flow in the fuel injection apparatus of the conventional internal combustion engine. この発明の実施の形態２の内燃機関の燃料噴射装置の構成を示すもので、図４（ａ）は一部断面平面図、図４（ｂ）は空気導入口形成部の拡大図である。FIGS. 4A and 4B show a configuration of a fuel injection device for an internal combustion engine according to a second embodiment of the present invention, in which FIG. 4A is a partial cross-sectional plan view, and FIG. 4B is an enlarged view of an air inlet formation portion. 図４に示した内燃機関の燃料噴射装置の変形例を示す一部断面平面図である。FIG. 5 is a partial cross-sectional plan view showing a modification of the fuel injection device for the internal combustion engine shown in FIG. 4. 図４に示した内燃機関の燃料噴射装置の他の変形例を示す一部断面平面図である。FIG. 10 is a partial cross-sectional plan view showing another modification of the fuel injection device for the internal combustion engine shown in FIG. 4.

符号の説明Explanation of symbols

１ 燃料噴射装置本体、２ 噴口、３ 開口空間形成部材、３ａ 外周部、
３ｂ 内周部、３ｃ 上端部、３ｄ 開口部、３ｅ 開口空間、３ｆ 溝形成部、
３ｇ 溝、１３，２３，３３ 開口空間形成部材、１５ 空気導入孔形成部、
１６ 空気導入孔。 DESCRIPTION OF SYMBOLS 1 Fuel injection apparatus main body, 2 injection hole, 3 opening space formation member, 3a outer peripheral part,
3b inner peripheral part, 3c upper end part, 3d opening part, 3e opening space, 3f groove forming part,
3g groove, 13, 23, 33 opening space forming member, 15 air introduction hole forming part,
16 Air introduction hole.

Claims (5)

燃料が噴射される複数の噴口が一つの円周上にあるようにして先端部に配置された燃料噴射装置本体と、上記燃料噴射装置本体の上記噴口の上記燃料の噴出側に設けられ上記噴口側と反対側に開口部を有し円筒状の開口空間を形成する空間部形成部材と、上記空間部形成部材の内周部に上記噴口に隣接して上記噴口の数と同数の上記噴口側から上記開口部に向けて上記内周部における周方向の位置が変化する旋回溝を形成する溝形成部とを備えた内燃機関の燃料噴射装置。 A fuel injection device main body arranged at a tip so that a plurality of injection holes for fuel injection are on one circumference, and the injection ports provided on the fuel injection side of the injection ports of the fuel injection device main body A space forming member having an opening on the opposite side to form a cylindrical opening space, and the same number of nozzle holes as the number of nozzles adjacent to the nozzle holes on the inner periphery of the space forming member A fuel injection device for an internal combustion engine, comprising: a groove forming portion that forms a turning groove in which a circumferential position of the inner peripheral portion changes from the opening toward the opening. 上記空間部形成部材は、径が上記噴口側から上記開口部に向かうに従い次第に拡大する円筒状の開口空間を形成するものであることを特徴とする請求項１に記載の内燃機関の燃料噴射装置。 2. The fuel injection device for an internal combustion engine according to claim 1, wherein the space portion forming member forms a cylindrical opening space whose diameter gradually increases from the nozzle side toward the opening. 3. . 上記噴口近傍に設けられ上記開口空間と上記空間部形成部材の外部とを連通する空気導入孔を形成する空気導入孔形成部を有するものであることを特徴とする請求項１に記載の内燃機関の燃料噴射装置。 2. The internal combustion engine according to claim 1, further comprising an air introduction hole forming portion that is provided in the vicinity of the nozzle and that forms an air introduction hole that communicates the opening space and the outside of the space portion forming member. Fuel injectors. 上記空気導入孔形成部は上記噴口に対応して設けられ上記空間部形成部材の外部から上記噴口の近傍へ向う空気導入孔を形成するものであることを特徴とする請求項３に記載の内燃機関の燃料噴射装置。 The internal combustion engine according to claim 3, wherein the air introduction hole forming portion is provided corresponding to the nozzle hole and forms an air introduction hole that extends from the outside of the space portion forming member to the vicinity of the nozzle hole. Engine fuel injection device. 上記空気導入孔形成部は、上記空間部形成部材の開口部側から見て上記空間部形成部材の上記噴口側から上記開口部に向かう上記旋回溝の旋回方向に上記空間部形成部材の外部から上記噴口の近傍へ向う空気導入孔を形成するものであることを特徴とする請求項４に記載の内燃機関の燃料噴射装置。 The air introduction hole forming part is viewed from the opening side of the space part forming member from the outside of the space part forming member in the turning direction of the turning groove toward the opening part from the nozzle side of the space part forming member. 5. The fuel injection device for an internal combustion engine according to claim 4, wherein an air introduction hole is formed toward the vicinity of the injection hole.
JP2005219756A 2005-07-29 2005-07-29 Fuel injection device for internal combustion engine Expired - Fee Related JP4217231B2 (en)

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JP4217231B2 true JP4217231B2 (en) 2009-01-28

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