JP2007132323A - Fuel injection nozzle - Google Patents

Fuel injection nozzle Download PDF

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Publication number
JP2007132323A
JP2007132323A JP2005328866A JP2005328866A JP2007132323A JP 2007132323 A JP2007132323 A JP 2007132323A JP 2005328866 A JP2005328866 A JP 2005328866A JP 2005328866 A JP2005328866 A JP 2005328866A JP 2007132323 A JP2007132323 A JP 2007132323A
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Prior art keywords
piece
fuel injection
inner diameter
nozzle
nozzle hole
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JP2005328866A
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Japanese (ja)
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JP4454567B2 (en
Inventor
Shigeo Nomura
重夫 野村
Yoshiaki Nishijima
義明 西島
Yoshinori Oonagane
嘉紀 太長根
Yoshimasa Watanabe
義正 渡辺
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Denso Corp
Toyota Motor Corp
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Denso Corp
Toyota Motor Corp
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Priority to JP2005328866A priority Critical patent/JP4454567B2/en
Priority to DE200610035431 priority patent/DE102006035431B4/en
Publication of JP2007132323A publication Critical patent/JP2007132323A/en
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Publication of JP4454567B2 publication Critical patent/JP4454567B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection nozzle having simple construction surely preventing fuel leakage from a nozzle hole. <P>SOLUTION: A first piece 5A as part of the main body of an outer needle 5 has an enlarged inner-diameter portion 10 formed on the inner periphery side of the front end where an upper seat 5a is provided. On the enlarged inner-diameter portion 10, a second piece 5B is mounted in close contact which has mechanical property of flexibility or elasticity more than the first piece 5A. When a lower seat 5b provided at the front end of the second piece 5B is seated on a second seat surface 8 and then an upper seat 5a of the first piece 5A is seated on a first seat surface 7, the front end of the second piece 5B can flex to the side of a small-diameter portion 6c of an inner needle 6 with the lower seat 5b being moved on the second seat surface 8 to the downstream side. As a result, a first needle hole 3 is surely sealed at its upstream and downstream sides. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関用の燃料噴射ノズルに関する。   The present invention relates to a fuel injection nozzle for an internal combustion engine.

従来、アウタニードルの内側にインナニードルを備える同軸２重ニードル式（以下２ニードル式と呼ぶ）の燃料噴射ノズルが知られている。
例えば、特許文献１に記載された燃料噴射ノズルは、図６に示す様に、第１の噴孔１００を開閉するインナニードル１１０と、第２の噴孔１２０を開閉するアウタニードル１３０とを有し、インナニードル１１０がアウタニードル１３０より先にリフトして第１の噴孔１００より燃料を噴射した後、アウタニードル１３０がリフトして第２の噴孔１２０より燃料を噴射する構成である。 2. Description of the Related Art Conventionally, a coaxial double needle type (hereinafter referred to as “double needle type”) fuel injection nozzle having an inner needle inside an outer needle is known.
For example, the fuel injection nozzle described in Patent Document 1 has an inner needle 110 that opens and closes the first injection hole 100 and an outer needle 130 that opens and closes the second injection hole 120, as shown in FIG. Then, after the inner needle 110 is lifted ahead of the outer needle 130 and injects fuel from the first nozzle hole 100, the outer needle 130 is lifted and fuel is injected from the second nozzle hole 120.

また、アウタニードル１３０には、閉弁時に第２の噴孔１２０の上流側シート面に着座する上シート部１３１の他に、第２の噴孔１２０の下流側シート面に着座する下シート部１３２が設けられ、この下シート部１３２で第２の噴孔１２０の下流側（第１の噴孔１００と第２の噴孔１２０との間）をシールすることにより、インナニードル１１０とアウタニードル１３０との摺動隙間から流れ出る燃料、あるいはアウタニードル１３０の外側に形成される燃料通路１４０から連通孔１５０を通ってアウタニードル１３０の内側へ流れ込む燃料が第２の噴孔１２０より流出する燃料リークを防止している。   In addition, the outer needle 130 has a lower seat portion seated on the downstream seat surface of the second nozzle hole 120 in addition to the upper seat portion 131 seated on the upstream seat surface of the second nozzle hole 120 when the valve is closed. 132, and the lower seat portion 132 seals the downstream side of the second injection hole 120 (between the first injection hole 100 and the second injection hole 120), whereby the inner needle 110 and the outer needle Fuel leaking out from the second nozzle hole 120 is fuel flowing out of the sliding gap with the nozzle 130 or fuel flowing into the outer needle 130 from the fuel passage 140 formed outside the outer needle 130 through the communication hole 150. Is preventing.

一方、特許文献２に記載された燃料噴射ノズルは、図７に示す様に、第１の噴孔２００を開閉するインナニードル２１０と、第２の噴孔２２０を開閉するアウタニードル２３０と、両ニードル２１０、２３０間に配置される環状の分割スリーブ２４０とを有し、この分割スリーブ２４０が第２の噴孔２２０の下流側をシールすることにより、第２の噴孔２２０からの燃料リークを防止している。
国際公開第０３／０４０５４３号パンフレット 特開平４−２３２３７５号公報 On the other hand, as shown in FIG. 7, the fuel injection nozzle described in Patent Document 2 includes an inner needle 210 that opens and closes the first injection hole 200, an outer needle 230 that opens and closes the second injection hole 220, and both An annular split sleeve 240 disposed between the needles 210 and 230, and the split sleeve 240 seals the downstream side of the second nozzle hole 220, thereby preventing fuel leakage from the second nozzle hole 220. It is preventing.
International Publication No. 03/040543 Pamphlet JP-A-4-232375

ところが、特許文献１に示される燃料噴射ノズルは、アウタニードル１３０に設けられた２か所のシート部１３１、１３２で第２の噴孔１２０の上流側と下流側を同時にシールするためには、高精度な加工が必要となる。つまり、シート部の摩耗を抑制するため、高硬度な材料が望まれる中で、２か所のシート部１３１、１３２が同時にシート面に着座できる様に加工することは、加工公差を考慮すると極めて困難であり、実際には、下シート部１３２に弾性を持たせたバネ構造を採用する必要がある。このため、加工が複雑になり、コストアップを招くと共に、耐久性の点でも問題が生じる。   However, in the fuel injection nozzle shown in Patent Document 1, in order to seal the upstream side and the downstream side of the second injection hole 120 at the same time with the two seat portions 131 and 132 provided in the outer needle 130, High precision machining is required. In other words, in order to suppress wear of the seat portion, a material having a high hardness is desired, and processing so that the two seat portions 131 and 132 can be seated on the seat surface at the same time is extremely difficult considering processing tolerances. In practice, it is necessary to employ a spring structure in which the lower seat portion 132 is made elastic. For this reason, the processing becomes complicated, resulting in an increase in cost and a problem in terms of durability.

また、特許文献２に示される燃料噴射ノズルでは、アウタニードル２３０と分割スリーブ２４０とが摺動する構成であり、両者間に潤滑のために燃料を通す必要があるため、摺動抵抗を上げずに燃料リークを防止することは困難である。つまり、アウタニードル２３０と分割スリーブ２４０の円滑な動作を保証するためには、両者間の摺動隙間をある程度確保して摺動抵抗を小さくする必要がある。この場合、アウタニードル２３０と分割スリーブ２４０との摺動隙間を通る燃料が多くなるため、結果的に第２の噴孔２２０からの燃料リークが発生する。
本発明は、上記事情に基づいて成されたもので、その目的は、簡易な構成によって噴孔からの燃料リークを確実に防止できる燃料噴射ノズルを提供することにある。 Further, in the fuel injection nozzle shown in Patent Document 2, the outer needle 230 and the split sleeve 240 are configured to slide, and it is necessary to pass fuel between them for lubrication, so that the sliding resistance is not increased. It is difficult to prevent fuel leakage. That is, in order to ensure smooth operation of the outer needle 230 and the split sleeve 240, it is necessary to secure a sliding clearance between them to reduce sliding resistance. In this case, the amount of fuel passing through the sliding gap between the outer needle 230 and the split sleeve 240 increases, and as a result, fuel leakage from the second injection hole 220 occurs.
The present invention has been made based on the above circumstances, and an object thereof is to provide a fuel injection nozzle that can reliably prevent fuel leakage from the injection hole with a simple configuration.

（請求項１の発明）
本発明は、上流側に第１の噴孔、下流側に第２の噴孔を有すると共に、第１の噴孔の上流側に第１のシート面、第１の噴孔と第２の噴孔との間に第２のシート面を形成するノズルボディと、このノズルボディの内部に往復動自在に収容され、第１の噴孔を開閉する円筒形状のアウタニードルと、このアウタニードルの内側に摺動自在に挿入され、第２の噴孔を開閉するインナニードルとを有し、アウタニードルがインナニードルに先行してリフトする燃料噴射ノズルであって、アウタニードルは、第１の噴孔を閉じる閉弁時に、第１のシート面に着座して第１の噴孔の上流側を閉じる第１ピースと、この第１ピースの先端部に取り付けられて第１ピースと一体に可動し、第２のシート面に着座して第１の噴孔の下流側を閉じる第２ピースとで構成され、第１ピースは、先端部の内周側に内径を拡大した拡大内径部が形成され、第２ピースは、拡大内径部に密着して嵌め込まれ、第１ピースより撓り性あるいは弾性が良好となる機械的性質を有していることを特徴とする。 (Invention of Claim 1)
The present invention has a first nozzle hole on the upstream side and a second nozzle hole on the downstream side, and the first sheet surface, the first nozzle hole and the second nozzle on the upstream side of the first nozzle hole. A nozzle body that forms a second sheet surface between the nozzle body, a cylindrical outer needle that is reciprocally accommodated in the nozzle body, and that opens and closes the first injection hole, and an inner side of the outer needle And a fuel injection nozzle that has an inner needle that opens and closes the second nozzle hole, and the outer needle lifts ahead of the inner needle, the outer needle having the first nozzle hole A first piece that is seated on the first seat surface and closes the upstream side of the first nozzle hole, and is attached to the tip of the first piece and moves integrally with the first piece. With the second piece seated on the second seat surface and closing the downstream side of the first nozzle hole The first piece is formed with an enlarged inner diameter portion with an enlarged inner diameter on the inner peripheral side of the tip portion, and the second piece is fitted in close contact with the enlarged inner diameter portion, and is more flexible or elastic than the first piece. Is characterized by having good mechanical properties.

上記の構成によれば、アウタニードルの閉弁時に、第２ピースが第２のシート面に着座して第１の噴孔の下流側を閉じることにより、アウタニードルとインナニードルとの間に設けられる摺動隙間と第１の噴孔との間が液密に遮断される。その結果、前記摺動隙間を通って第１の噴孔より燃料がリークすることを防止できる。
なお、第１の噴孔の上流側と下流側とが共にシールされると、第２ピースの外周側には第１の噴孔を通じて大気圧が作用し、第２ピースの内周側には前記摺動隙間を通じて高圧が作用する。このため、第１ピースの拡大内径部に嵌め込まれた第２ピースに内周側から高圧が加わり、第２ピースを拡大内径部に押し付ける力が働く。その結果、拡大内径部と第２ピースとの間がシールされるため、拡大内径部と第２ピースとの間から燃料が漏れることを防止できる。 According to the above configuration, when the outer needle is closed, the second piece sits on the second seat surface and closes the downstream side of the first nozzle hole, thereby providing between the outer needle and the inner needle. The gap between the sliding gap and the first nozzle hole is liquid-tightly blocked. As a result, it is possible to prevent fuel from leaking from the first nozzle hole through the sliding gap.
When both the upstream side and the downstream side of the first nozzle hole are sealed, atmospheric pressure acts on the outer peripheral side of the second piece through the first nozzle hole, and on the inner peripheral side of the second piece. A high pressure acts through the sliding gap. For this reason, a high pressure is applied from the inner peripheral side to the second piece fitted in the enlarged inner diameter portion of the first piece, and a force pressing the second piece against the enlarged inner diameter portion acts. As a result, since the gap between the enlarged inner diameter portion and the second piece is sealed, fuel can be prevented from leaking from between the enlarged inner diameter portion and the second piece.

また、本発明の第２ピースは、第１ピースより撓り性あるいは弾性が良好となる機械的性質を有しているため、第１ピースと第２ピースとが同時に着座できない場合に、その着座タイミングのずれを吸収できる。例えば、第２ピースが第２のシート面に着座した時点で、第１ピースが第１のシート面に着座できない場合に、既に第２のシート面に着座している第２ピースが撓むことで、第１ピースと第２ピースの着座タイミングのずれを吸収でき、第１の噴孔の上流側と下流側とを隙間無く閉じることができる。この場合、アウタニードル自体にバネ構造を持たせるための複雑な加工を行う必要がなく、撓り性あるいは弾性を有する第２ピースを第１ピースの拡大内径部に嵌め込むだけの簡易な構成によって燃料リークを防止できるので、先の公知技術（特許文献１）と比較して安価であり、且つ耐久性にも優れた燃料噴射ノズルを提供できる。   Further, since the second piece of the present invention has mechanical properties that are more flexible or elastic than the first piece, if the first piece and the second piece cannot be seated at the same time, the second piece is seated. Can absorb timing shifts. For example, when the second piece is seated on the second seat surface and the first piece cannot be seated on the first seat surface, the second piece already seated on the second seat surface bends. Thus, the difference in seating timing between the first piece and the second piece can be absorbed, and the upstream side and the downstream side of the first nozzle hole can be closed without a gap. In this case, it is not necessary to perform complicated processing for providing the outer needle itself with a spring structure, and a simple configuration in which the second piece having flexibility or elasticity is simply fitted into the enlarged inner diameter portion of the first piece. Since fuel leakage can be prevented, a fuel injection nozzle that is inexpensive and superior in durability compared to the prior art (Patent Document 1) can be provided.

（請求項２の発明）
請求項１に記載した燃料噴射ノズルにおいて、第１ピースに形成される拡大内径部は、第１ピースの先端に向かって内径が次第に小さくなる逆テーパ形状に設けられ、第２ピースは、拡大内径部にテーパ嵌合して取り付けられることを特徴とする。
上記の構成によれば、第１ピースの拡大内径部に第２ピースをテーパ嵌合するだけの簡易な構成により、アウタニードルのリフト時、つまり第１ピースがリフトした時に、第２ピースが取り残されることなく、第１ピースと一体にリフトできる。 (Invention of Claim 2)
2. The fuel injection nozzle according to claim 1, wherein the enlarged inner diameter portion formed in the first piece is provided in an inversely tapered shape in which the inner diameter gradually decreases toward the tip of the first piece, and the second piece has an enlarged inner diameter. It is characterized by being attached by taper fitting to the part.
According to the above configuration, the second piece is left behind when the outer needle is lifted, that is, when the first piece is lifted, by a simple configuration in which the second piece is taper-fitted to the enlarged inner diameter portion of the first piece. The first piece can be lifted together without being lifted.

（請求項３の発明）
請求項１または２に記載した燃料噴射ノズルにおいて、アウタニードルは、第２ピースが第２のシート面に着座した後、第１ピースが第１のシート面に着座することを特徴とする。
この場合、第２ピースが第２のシート面に着座した後、第１ピースより撓り性あるいは弾性が良好な第２ピースが撓むことにより、第１ピースが第１のシート面に着座して、第１の噴孔の上流側と下流側とを液密に閉じることができる。 (Invention of Claim 3)
The fuel injection nozzle according to claim 1 or 2, wherein the outer needle has the first piece seated on the first seat surface after the second piece seated on the second seat surface.
In this case, after the second piece is seated on the second seat surface, the second piece having better flexibility or elasticity than the first piece is deflected, so that the first piece is seated on the first seat surface. Thus, the upstream side and the downstream side of the first nozzle hole can be liquid-tightly closed.

（請求項４の発明）
請求項３に記載した燃料噴射ノズルにおいて、第２ピースの内径側には、アウタニードルの閉弁時に、第２ピースの先端部が第２のシート面に沿ってシート位置を内径側へ移動できる逃げ代が確保されていることを特徴とする。
この場合、第２ピースが第２のシート面に着座した後、その第２ピースの先端部がシート面に沿ってインナニードル側（内径側）へ撓むことにより、第１ピースが第１のシート面に着座して、第１ピースと第２ピースとの着座タイミングのずれを吸収できる。 (Invention of Claim 4)
4. The fuel injection nozzle according to claim 3, wherein when the outer needle is closed, the distal end portion of the second piece can move the seat position along the second seat surface toward the inner diameter side on the inner diameter side of the second piece. It is characterized by a sufficient escape allowance.
In this case, after the second piece is seated on the second seat surface, the tip of the second piece bends toward the inner needle side (inner diameter side) along the seat surface, so that the first piece becomes the first piece. Sitting on the seat surface can absorb the deviation in seating timing between the first piece and the second piece.

（請求項５の発明）
請求項１〜４に記載した何れかの燃料噴射ノズルにおいて、第２ピースは、反シート側の端部が拡大内径部に嵌め込まれる嵌合部として設けられ、その嵌合部より先端側には、拡大内径部の内周面と第２ピースの外周面との間に隙間が確保されていることを特徴とする。
この場合、第１ピースの先端部が前記隙間分だけ内側（第２ピース側）へ変形可能となるため、第１のシート面に対する第１ピースの密着度が向上する。 (Invention of Claim 5)
The fuel injection nozzle according to any one of claims 1 to 4, wherein the second piece is provided as a fitting portion in which the end portion on the side opposite to the seat is fitted into the enlarged inner diameter portion, and on the tip side from the fitting portion. A gap is secured between the inner peripheral surface of the enlarged inner diameter portion and the outer peripheral surface of the second piece.
In this case, since the tip of the first piece can be deformed inward (second piece side) by the gap, the degree of adhesion of the first piece to the first sheet surface is improved.

本発明を実施するための最良の形態を以下の実施例により詳細に説明する。   The best mode for carrying out the present invention will be described in detail with reference to the following examples.

図１は燃料噴射ノズルの先端部を示す半断面図である。
本実施例の燃料噴射ノズルは、例えば、ディーゼル機関用のインジェクタに用いられるもので、ノズルボディ１とニードル（後述する）とで構成される。
ノズルボディ１には、径方向の中央部を長手方向（図示上下方向）に穿設された縦孔２と、この縦孔２に通じる噴孔（第１の噴孔３と第２の噴孔４）等が設けられている。
縦孔２の下端部には、円錐状のテーパ面が形成され、更にテーパ面の下流端よりサック室２ａが凹設されている。
第１の噴孔３は、テーパ面を形成しているノズルボディ１の先端壁部を貫通して設けられ、第２の噴孔４は、サック室２ａを形成しているノズルボディ１の先端壁部を貫通して設けられている。つまり、第１の噴孔３の方が第２の噴孔４より図示上方（上流側）に位置している。 FIG. 1 is a half sectional view showing the tip of the fuel injection nozzle.
The fuel injection nozzle of the present embodiment is used for, for example, an injector for a diesel engine, and includes a nozzle body 1 and a needle (described later).
The nozzle body 1 has a vertical hole 2 formed in the radial direction in the longitudinal direction (the vertical direction in the figure), and a nozzle hole (first nozzle hole 3 and second nozzle hole) communicating with the vertical hole 2. 4) etc. are provided.
A conical taper surface is formed at the lower end of the vertical hole 2, and a sac chamber 2a is recessed from the downstream end of the taper surface.
The first nozzle hole 3 is provided through the tip wall portion of the nozzle body 1 forming a tapered surface, and the second nozzle hole 4 is the tip of the nozzle body 1 forming the sac chamber 2a. It is provided through the wall. That is, the first nozzle hole 3 is positioned above (upstream side) in the drawing from the second nozzle hole 4.

ニードルは、第１の噴孔３を開閉するためのアウタニードル５と、第２の噴孔４を開閉するためのインナニードル６とで構成され、円筒形状を有するアウタニードル５の内側にインナニードル６が同軸に且つ摺動自在に挿入されている。
アウタニードル５は、縦孔２の内部に往復動自在に収容され、図示しないスプリングにより閉弁方向（図示下方）に付勢されている。このアウタニードル５は、第１の噴孔３を閉じる閉弁時に、第１の噴孔３より上流側のテーパ面（以下、第１のシート面７と呼ぶ）に着座して、第１の噴孔３の上流側を液密に閉じる第１ピース５Ａと、この第１ピース５Ａの先端部に取り付けられ、第１の噴孔３より下流側のテーパ面（以下、第２のシート面８と呼ぶ）に着座して、第１の噴孔３の下流側を液密に閉じる第２ピース５Ｂとで構成される。 The needle is composed of an outer needle 5 for opening and closing the first nozzle hole 3 and an inner needle 6 for opening and closing the second nozzle hole 4, and the inner needle is formed inside the outer needle 5 having a cylindrical shape. 6 is inserted coaxially and slidably.
The outer needle 5 is accommodated in the vertical hole 2 so as to be reciprocally movable, and is urged in a valve closing direction (downward in the drawing) by a spring (not shown). The outer needle 5 is seated on a tapered surface upstream of the first nozzle hole 3 (hereinafter referred to as the first seat surface 7) when the first nozzle hole 3 is closed, and the first needle hole 3 is closed. A first piece 5A that closes the upstream side of the nozzle hole 3 in a liquid-tight manner, and a tapered surface (hereinafter referred to as a second sheet surface 8) that is attached to the tip of the first piece 5A and that is downstream of the first nozzle hole 3 And the second piece 5B that closes the downstream side of the first nozzle hole 3 in a liquid-tight manner.

第１ピース５Ａは、アウタニードル５の主体（本体）を構成し、先端部（図示下端部）が円錐状に設けられると共に、その先端部の外周にシートライン（以下、上シート５ａと呼ぶ）が形成され、この上シート５ａが第１のシート面７に着座して、縦孔２と第１ピース５Ａとの間に形成される燃料通路９と第１の噴孔３との間を液密に遮断する。また、先端部の内周側には、内径を拡大した拡大内径部１０が形成され、この拡大内径部１０が第１ピース５Ａの先端まで形成されている。なお、拡大内径部１０は、図示上端から下端に向かって、内径が若干小さくなる逆テーパ形状に設けられている。   The first piece 5A constitutes the main body (main body) of the outer needle 5, the tip portion (lower end portion in the figure) is provided in a conical shape, and the seat line (hereinafter referred to as the upper seat 5a) is provided on the outer periphery of the tip portion. The upper seat 5a is seated on the first seat surface 7, and a liquid is formed between the fuel passage 9 formed between the vertical hole 2 and the first piece 5A and the first injection hole 3. Shut off tightly. Further, an enlarged inner diameter portion 10 having an enlarged inner diameter is formed on the inner peripheral side of the tip portion, and this enlarged inner diameter portion 10 is formed up to the tip of the first piece 5A. The enlarged inner diameter portion 10 is provided in a reverse tapered shape in which the inner diameter is slightly reduced from the upper end to the lower end in the figure.

第２ピース５Ｂは、第１ピース５Ａの拡大内径部１０に密着して嵌め込まれる（テーパ嵌合する）環状体であり、第１ピース５Ａより撓り性あるいは弾性が良好となる機械的性質を有している。この第２ピース５Ｂは、先端部が第１ピース５Ａの上シート５ａより図示下方へ突き出ており、その先端部の外周にシートライン（以下、下シート５ｂと呼ぶ）が形成され、この下シート５ｂが第２のシート面８に着座して、第１の噴孔３の下流側を液密に閉じることができる。但し、第１ピース５Ａの上シート５ａが第１のシート面７に着座するタイミングより、第２ピース５Ｂの下シート５ｂが第２のシート面８に着座するタイミングの方が若干早くなる様に設けられている。第１ピース５Ａの上シート５ａ及び第２ピース５Ｂの下シート５ｂは、第１ピース５Ａの先端部に第２ピース５Ｂを組み付けた後、両シート５ａ、５ｂを加工しても良い。   The second piece 5B is an annular body that is closely fitted (tapered) to the enlarged inner diameter portion 10 of the first piece 5A, and has a mechanical property that provides better flexibility or elasticity than the first piece 5A. Have. The second piece 5B has a leading end protruding downward from the upper sheet 5a of the first piece 5A in the figure, and a sheet line (hereinafter referred to as a lower sheet 5b) is formed on the outer periphery of the leading end. 5b can be seated on the second sheet surface 8 and the downstream side of the first nozzle hole 3 can be closed in a liquid-tight manner. However, the timing at which the lower seat 5b of the second piece 5B is seated on the second seat surface 8 is slightly earlier than the timing at which the upper seat 5a of the first piece 5A is seated on the first seat surface 7. Is provided. The upper sheet 5a of the first piece 5A and the lower sheet 5b of the second piece 5B may be processed on both the sheets 5a and 5b after the second piece 5B is assembled to the tip of the first piece 5A.

インナニードル６は、アウタニードル５の内側に所定のクリアランス（摺動隙間）を有して摺動自在に挿入され、図示しないスプリング（アウタニードル５を付勢するスプリングとは別のスプリング）により閉弁方向（図示下方）に付勢されている。このインナニードル６は、先端部（図示下端部）の外周にシートライン（以下、内シート６ａと呼ぶ）が形成され、この内シート６ａが第２のシート面８に着座して、前述の燃料通路９と第２の噴孔４との間を液密に遮断する。
なお、内シート６ａの外径（シート径と呼ぶ）は、アウタニードル５の内周を摺動する摺動部６ｂの外径より小さく設けられている。また、シート径の上流側には、シート径と同一径の小径部６ｃが設けられ、この小径部６ｃと摺動部６ｂとの間にテーパ状の段差６ｄが設けられている。 The inner needle 6 is slidably inserted inside the outer needle 5 with a predetermined clearance (sliding gap), and is closed by a spring (not shown) (a spring different from the spring that biases the outer needle 5). It is biased in the valve direction (downward in the figure). The inner needle 6 has a seat line (hereinafter referred to as an inner seat 6a) formed on the outer periphery of a tip portion (lower end portion in the drawing), and the inner seat 6a is seated on the second seat surface 8 to The space between the passage 9 and the second nozzle hole 4 is liquid-tightly blocked.
The outer diameter of the inner sheet 6a (referred to as the sheet diameter) is smaller than the outer diameter of the sliding portion 6b that slides on the inner periphery of the outer needle 5. Further, on the upstream side of the seat diameter, a small diameter portion 6c having the same diameter as the seat diameter is provided, and a tapered step 6d is provided between the small diameter portion 6c and the sliding portion 6b.

次に、燃料噴射ノズルの作動を説明する。
本実施例の燃料噴射ノズルは、アウタニードル５がインナニードル６に先行してリフトする。このアウタニードル５のリフトにより、第１ピース５Ａの上シート５ａが第１のシート面７から離れると、燃料通路９に供給される燃料が第１の噴孔３より噴射される。この時、第２ピース５Ｂは、第１ピース５Ａの拡大内径部１０にテーパ嵌合しているため、第１ピース５Ａのリフト時に取り残されることはなく、第１ピース５Ａと一体にリフトする。
アウタニードル５が所定のリフト量まで到達すると、アウタニードル５に続いてインナニードル６がリフトすることにより、燃料通路９からサック室２ａに流れ込んだ燃料が第２の噴孔４より噴射される。 Next, the operation of the fuel injection nozzle will be described.
In the fuel injection nozzle of the present embodiment, the outer needle 5 is lifted before the inner needle 6. When the upper seat 5 a of the first piece 5 </ b> A is separated from the first seat surface 7 by the lift of the outer needle 5, the fuel supplied to the fuel passage 9 is injected from the first injection hole 3. At this time, since the second piece 5B is taper-fitted to the enlarged inner diameter portion 10 of the first piece 5A, the second piece 5B is not left behind when the first piece 5A is lifted, and is lifted integrally with the first piece 5A.
When the outer needle 5 reaches a predetermined lift amount, the inner needle 6 is lifted following the outer needle 5, whereby the fuel that has flowed from the fuel passage 9 into the sac chamber 2 a is injected from the second injection hole 4.

その後、所定の噴射量が得られると、インナニードル６がアウタニードル５に先行して閉弁する。つまり、インナニードル６の内シート６ａが第２のシート面８に着座して、第２の噴孔４の上流側を閉じることにより、第２の噴孔４からの噴射が終了する。
続いて、アウタニードル５が第１の噴孔３を閉弁する。この時、図２（ａ）に示す様に、先ず第２ピース５Ｂの下シート５ｂが第２のシート面８に着座して第１の噴孔３の下流側を閉弁する。この時点で、第１ピース５Ａの上シート５ａは、未だ第１のシート面７に着座していない。 Thereafter, when a predetermined injection amount is obtained, the inner needle 6 is closed prior to the outer needle 5. That is, when the inner seat 6a of the inner needle 6 is seated on the second seat surface 8 and the upstream side of the second nozzle hole 4 is closed, the injection from the second nozzle hole 4 is completed.
Subsequently, the outer needle 5 closes the first injection hole 3. At this time, as shown in FIG. 2A, first, the lower seat 5b of the second piece 5B is seated on the second seat surface 8, and the downstream side of the first injection hole 3 is closed. At this time, the upper seat 5a of the first piece 5A has not yet been seated on the first seat surface 7.

続いて、第１ピース５Ａの上シート５ａが第１のシート面７に着座して、第１の噴孔３の上流側を閉弁する。この時、第２ピース５Ｂは、第１ピース５Ａより撓り性あるいは弾性が良好な機械的性質を有しているため、図２（ｂ）に示す様に、下シート５ｂが第２のシート面８上を下流側（図示矢印ａ方向）へ移動しながら、第２ピース５Ｂの先端部がインナニードル６の小径部６ｃ側（図示矢印ｂ方向）へ撓むことができる。その結果、第１の噴孔３の上流側と下流側とが確実にシールされる。   Subsequently, the upper seat 5a of the first piece 5A is seated on the first seat surface 7, and the upstream side of the first injection hole 3 is closed. At this time, the second piece 5B has mechanical properties that are more flexible or elastic than the first piece 5A. Therefore, as shown in FIG. 2B, the lower sheet 5b is the second sheet. The tip of the second piece 5B can bend toward the small-diameter portion 6c side (in the illustrated arrow b direction) of the inner needle 6 while moving on the surface 8 in the downstream side (in the illustrated arrow a direction). As a result, the upstream side and the downstream side of the first nozzle hole 3 are reliably sealed.

（実施例１の効果）
実施例１に記載した燃料噴射ノズルは、アウタニードル５の閉弁時に、第１の噴孔３の下流側が第２ピース５Ｂの下シート５ｂによって確実にシールされる。これにより、アウタニードル５とインナニードル６との間に設けられる摺動隙間と第１の噴孔３との間が液密に遮断されるため、摺動隙間を通って第１の噴孔３より燃料が漏れ出ることを防止できる。なお、アウタニードル５の閉弁時には、第２ピース５Ｂの下シート５ｂより外側には第１の噴孔３を通じて大気圧が作用し、第２ピース５Ｂの内周側には前記摺動隙間を通じて高圧が作用するため、第１ピース５Ａの拡大内径部１０に嵌め込まれた第２ピース５Ｂに内周側から高圧が加わり、第２ピース５Ｂを拡大内径部１０に押し付ける力が働く。その結果、拡大内径部１０と第２ピース５Ｂとの間がシールされるため、拡大内径部１０と第２ピース５Ｂとの間から燃料が漏れることはない。 (Effect of Example 1)
In the fuel injection nozzle described in the first embodiment, when the outer needle 5 is closed, the downstream side of the first injection hole 3 is reliably sealed by the lower seat 5b of the second piece 5B. As a result, the gap between the sliding gap provided between the outer needle 5 and the inner needle 6 and the first nozzle hole 3 is liquid-tightly blocked, so that the first nozzle hole 3 passes through the sliding gap. It is possible to prevent the fuel from leaking. When the outer needle 5 is closed, atmospheric pressure acts through the first injection hole 3 on the outer side of the lower seat 5b of the second piece 5B, and through the sliding gap on the inner peripheral side of the second piece 5B. Since the high pressure acts, a high pressure is applied from the inner peripheral side to the second piece 5B fitted in the enlarged inner diameter portion 10 of the first piece 5A, and a force that presses the second piece 5B against the enlarged inner diameter portion 10 acts. As a result, since the space between the enlarged inner diameter portion 10 and the second piece 5B is sealed, the fuel does not leak from between the enlarged inner diameter portion 10 and the second piece 5B.

また、第２ピース５Ｂは、第１ピース５Ａより撓り性あるいは弾性が良好となる機械的性質を有しているため、第２ピース５Ｂの下シート５ｂが第２のシート面８に着座した後、第２ピース５Ｂの先端部が内側へ撓むことにより、第１ピース５Ａの上シート５ａが第１のシート面７に着座することができる。つまり、第１ピース５Ａの上シート５ａが第１のシート面７に着座するタイミングより、第２ピース５Ｂの下シート５ｂが第２のシート面８に着座するタイミングを早く設定することで、両者の着座タイミングのずれを吸収でき、第１の噴孔３の上流側と下流側とを確実に閉じることができる。
この場合、アウタニードル５自体にバネ構造を持たせるための複雑な加工を行う必要がなく、撓り性あるいは弾性を有する第２ピース５Ｂを第１ピース５Ａの拡大内径部１０に嵌め込むだけの簡易な構成によって燃料リークを防止できるので、先の公知技術（特許文献１）と比較して安価であり、且つ耐久性にも優れた燃料噴射ノズルを提供できる。 Further, since the second piece 5B has mechanical properties that are more flexible or elastic than the first piece 5A, the lower sheet 5b of the second piece 5B is seated on the second seat surface 8. Thereafter, the upper sheet 5a of the first piece 5A can be seated on the first seat surface 7 by bending the tip of the second piece 5B inward. That is, by setting the timing at which the lower seat 5b of the second piece 5B is seated on the second seat surface 8 earlier than the timing at which the upper seat 5a of the first piece 5A is seated on the first seat surface 7, both Therefore, the upstream side and the downstream side of the first nozzle hole 3 can be reliably closed.
In this case, it is not necessary to perform complicated processing for providing the outer needle 5 with a spring structure, and the second piece 5B having flexibility or elasticity is merely fitted into the enlarged inner diameter portion 10 of the first piece 5A. Since fuel leakage can be prevented with a simple configuration, it is possible to provide a fuel injection nozzle that is inexpensive and superior in durability compared to the prior art (Patent Document 1).

なお、実施例１に示した燃料噴射ノズルは、第２ピース５Ｂを第１ピース５Ａの拡大内径部１０にテーパ嵌合させることで、第１ピース５Ａのリフト時に第２ピース５Ｂが取り残されることなく、第１ピース５Ａと一体にリフトできる構成であるが、テーパ嵌合以外の手段を採用することもできる。例えば、第１ピース５Ａの拡大内径部１０に第２ピース５Ｂを接着あるいは接合させても良い。または、スクリュ等で第２ピース５Ｂを第１ピース５Ａに固定することも可能である。   In the fuel injection nozzle shown in the first embodiment, the second piece 5B is left behind when the first piece 5A is lifted by taper-fitting the second piece 5B to the enlarged inner diameter portion 10 of the first piece 5A. However, the first piece 5A can be lifted integrally with the first piece 5A, but means other than the taper fitting may be employed. For example, the second piece 5B may be bonded or joined to the enlarged inner diameter portion 10 of the first piece 5A. Alternatively, the second piece 5B can be fixed to the first piece 5A with a screw or the like.

図３は燃料噴射ノズルの先端部を示す半断面図である。
この実施例２に示す燃料噴射ノズルは、図３に示す様に、インナニードル６の内シート６ａが摺動部６ｂと同一径に設けられる一例である。この場合、アウタニードル５の第２ピース５Ｂは、第１ピース５Ａの拡大内径部１０にテーパ嵌合する嵌合部の内径（第１ピース５Ａの内径と同一）より、先端側の内径の方が大きく設けられている。これにより、第２ピース５Ｂの先端側の内周面とインナニードル６の外周面との間に、アウタニードル５とインナニードル６との摺動隙間より大きな隙間Ａが確保される。その結果、インナニードル６の内シート６ａが摺動部６ｂと同一径に設けられる構成であっても、第２ピース５Ｂの下シート５ｂが第２のシート面８に着座した後、第１ピース５Ａの上シート５ａが第１のシート面７に着座する際に、第２ピース５Ｂの先端部が内側（インナニードル６側）へ撓むことができる。 FIG. 3 is a half sectional view showing the tip of the fuel injection nozzle.
The fuel injection nozzle shown in the second embodiment is an example in which the inner sheet 6a of the inner needle 6 is provided with the same diameter as the sliding portion 6b, as shown in FIG. In this case, the second piece 5B of the outer needle 5 has an inner diameter closer to the distal end than the inner diameter (same as the inner diameter of the first piece 5A) of the fitting portion taper-fitted to the enlarged inner diameter portion 10 of the first piece 5A. Is provided largely. Thereby, a gap A larger than the sliding gap between the outer needle 5 and the inner needle 6 is ensured between the inner peripheral surface on the distal end side of the second piece 5 </ b> B and the outer peripheral surface of the inner needle 6. As a result, even if the inner seat 6a of the inner needle 6 is provided with the same diameter as the sliding portion 6b, the first piece after the lower seat 5b of the second piece 5B is seated on the second seat surface 8 When the upper seat 5a of 5A is seated on the first seat surface 7, the tip of the second piece 5B can be bent inward (inner needle 6 side).

また、第２ピース５Ｂの先端側だけでなく、図４に示す様に、第２ピース５Ｂの全長に渡って、第２ピース５Ｂの内径を第１ピース５Ａの内径より大きく形成して、インナニードル６との間に前記摺動隙間より大きな隙間Ａを設定することもできる。
これにより、実施例１と同じく、第１ピース５Ａの上シート５ａが第１のシート面７に着座するタイミングより、第２ピース５Ｂの下シート５ｂが第２のシート面８に着座するタイミングを早く設定することで、両者の着座タイミングのずれを吸収でき、第１の噴孔３の上流側と下流側とを確実に閉じることができる。 Further, as shown in FIG. 4 as well as the front end side of the second piece 5B, the inner diameter of the second piece 5B is formed larger than the inner diameter of the first piece 5A over the entire length of the second piece 5B. A gap A larger than the sliding gap can be set between the needle 6 and the needle 6.
Thereby, the timing at which the lower seat 5b of the second piece 5B is seated on the second seat surface 8 from the timing at which the upper seat 5a of the first piece 5A is seated on the first seat surface 7 as in the first embodiment. By setting it early, it is possible to absorb the difference in seating timing between the two, and to reliably close the upstream side and the downstream side of the first nozzle hole 3.

図５は燃料噴射ノズルの先端部を示す半断面図である。
この実施例３では、図５に示す様に、第２ピース５Ｂの反シート側の端部（図示上端部）を第１ピース５Ａの拡大内径部１０にテーパ嵌合する嵌合部として設け、この嵌合部より先端側には、拡大内径部１０の内周面と第２ピース５Ｂの外周面との間に隙間Ｂを設けている。
この場合、第１ピース５Ａの先端部が前記隙間Ｂ分だけ内側（第２ピース５Ｂ側）へ変形可能となるため、第１のシート面７に対する上シート５ａの密着度が向上する。 FIG. 5 is a half sectional view showing the tip of the fuel injection nozzle.
In Example 3, as shown in FIG. 5, the end portion (the upper end portion in the drawing) of the second piece 5B on the side opposite to the sheet is provided as a fitting portion that is taper-fitted to the enlarged inner diameter portion 10 of the first piece 5A. A gap B is provided between the inner peripheral surface of the enlarged inner diameter portion 10 and the outer peripheral surface of the second piece 5B on the tip side from the fitting portion.
In this case, the front end portion of the first piece 5A can be deformed inward (the second piece 5B side) by the gap B, so that the degree of adhesion of the upper sheet 5a to the first sheet surface 7 is improved.

つまり、第１ピース５Ａが第１の噴孔３を確実に閉じるためには、上シート５ａが全周に渡って隙間無く第１のシート面７に当接する必要がある。しかし、例えば、上シート５ａの真円度の精度が低い場合、あるいは第１ピース５Ａが傾いている場合等には、上シート５ａが第１のシート面７に着座した時に、両者間に僅かながら隙間が生じることがある。この場合、第１ピース５Ａの上シート５ａが第１のシート面７に着座した後、第１ピース５Ａの先端部が内側へ変形することにより、上シート５ａが全周に渡って第１のシート面７に当接することができる。その結果、両者間の隙間が消滅して、第１の噴孔３の上流側を確実に閉じることができる。   That is, in order for the first piece 5A to securely close the first injection hole 3, the upper sheet 5a needs to abut on the first sheet surface 7 without a gap over the entire circumference. However, for example, when the accuracy of the roundness of the upper sheet 5a is low, or when the first piece 5A is inclined, when the upper sheet 5a is seated on the first sheet surface 7, there is a slight gap therebetween. However, gaps may occur. In this case, after the upper sheet 5a of the first piece 5A is seated on the first sheet surface 7, the tip portion of the first piece 5A is deformed inward, so that the upper sheet 5a extends over the entire circumference. It can abut against the sheet surface 7. As a result, the gap between the two disappears, and the upstream side of the first nozzle hole 3 can be reliably closed.

燃料噴射ノズルの先端部を示す半断面図である（実施例１）。(Example 1) which is a semi-sectional view which shows the front-end | tip part of a fuel-injection nozzle. （ａ）下シートの着座状態を示す断面図、（ｂ）上シートと下シートの着座状態を示す断面図である（実施例１）。(A) It is sectional drawing which shows the seating state of a lower sheet, (b) It is sectional drawing which shows the seating state of an upper sheet and a lower sheet (Example 1). 燃料噴射ノズルの先端部を示す半断面図である（実施例２）。(Example 2) which is a half sectional view which shows the front-end | tip part of a fuel-injection nozzle. 燃料噴射ノズルの先端部を示す半断面図である（実施例２）。(Example 2) which is a half sectional view which shows the front-end | tip part of a fuel-injection nozzle. 燃料噴射ノズルの先端部を示す半断面図である（実施例３）。(Example 3) which is a half sectional view which shows the front-end | tip part of a fuel-injection nozzle. 燃料噴射ノズルの先端部を示す断面図である（公知技術）。It is sectional drawing which shows the front-end | tip part of a fuel-injection nozzle (known technique). 燃料噴射ノズルの先端部を示す断面図である（公知技術）。It is sectional drawing which shows the front-end | tip part of a fuel-injection nozzle (known technique).

符号の説明Explanation of symbols

１ ノズルボディ
３ 第１の噴孔
４ 第２の噴孔
５ アウタニードル
５Ａ 第１ピース
５Ｂ 第２ピース
６ インナニードル
７ 第１のシート面
８ 第２のシート面
１０ 第１ピースの拡大内径部
Ｂ 拡大内径部の内周面と第２ピースの外周面との間の隙間
DESCRIPTION OF SYMBOLS 1 Nozzle body 3 1st injection hole 4 2nd injection hole 5 Outer needle 5A 1st piece 5B 2nd piece 6 Inner needle 7 1st sheet | seat surface 8 2nd sheet | seat surface 10 The expanded internal diameter part B of 1st piece Gap between the inner peripheral surface of the enlarged inner diameter portion and the outer peripheral surface of the second piece

Claims (5)

上流側に第１の噴孔、下流側に第２の噴孔を有すると共に、前記第１の噴孔の上流側に第１のシート面、前記第１の噴孔と前記第２の噴孔との間に第２のシート面を形成するノズルボディと、
このノズルボディの内部に往復動自在に収容され、前記第１の噴孔を開閉する円筒形状のアウタニードルと、
このアウタニードルの内側に摺動自在に挿入され、前記第２の噴孔を開閉するインナニードルとを有し、
前記アウタニードルが前記インナニードルに先行してリフトする燃料噴射ノズルであって、
前記アウタニードルは、前記第１の噴孔を閉じる閉弁時に、前記第１のシート面に着座して前記第１の噴孔の上流側を閉じる第１ピースと、この第１ピースの先端部に取り付けられて前記第１ピースと一体に可動し、前記第２のシート面に着座して前記第１の噴孔の下流側を閉じる第２ピースとで構成され、
前記第１ピースは、先端部の内周側に内径を拡大した拡大内径部が形成され、
前記第２ピースは、前記拡大内径部に密着して嵌め込まれ、前記第１ピースより撓り性あるいは弾性が良好となる機械的性質を有していることを特徴とする燃料噴射ノズル。 The first nozzle hole is provided upstream, the second nozzle hole is provided downstream, and the first sheet surface, the first nozzle hole, and the second nozzle hole are provided upstream of the first nozzle hole. A nozzle body that forms a second sheet surface therebetween,
A cylindrical outer needle that is reciprocally accommodated in the nozzle body and opens and closes the first nozzle hole;
An inner needle that is slidably inserted inside the outer needle and opens and closes the second nozzle hole;
A fuel injection nozzle in which the outer needle lifts ahead of the inner needle;
The outer needle includes a first piece that sits on the first seat surface and closes the upstream side of the first nozzle hole when the valve closes the first nozzle hole, and a tip portion of the first piece. And a second piece that moves integrally with the first piece, sits on the second seat surface, and closes the downstream side of the first nozzle hole,
The first piece is formed with an enlarged inner diameter portion with an inner diameter enlarged on the inner peripheral side of the tip portion,
The fuel injection nozzle, wherein the second piece is fitted in close contact with the enlarged inner diameter portion and has a mechanical property that is more flexible or elastic than the first piece. 請求項１に記載した燃料噴射ノズルにおいて、
前記第１ピースに形成される前記拡大内径部は、前記第１ピースの先端に向かって内径が次第に小さくなる逆テーパ形状に設けられ、前記第２ピースは、前記拡大内径部にテーパ嵌合して取り付けられることを特徴とする燃料噴射ノズル。 The fuel injection nozzle according to claim 1,
The enlarged inner diameter portion formed in the first piece is provided in a reverse taper shape in which the inner diameter gradually decreases toward the tip of the first piece, and the second piece is taper-fitted to the enlarged inner diameter portion. A fuel injection nozzle characterized by being attached. 請求項１または２に記載した燃料噴射ノズルにおいて、
前記アウタニードルは、前記第２ピースが前記第２のシート面に着座した後、前記第１ピースが前記第１のシート面に着座することを特徴とする燃料噴射ノズル。 The fuel injection nozzle according to claim 1 or 2,
The fuel injection nozzle, wherein the outer needle has the first piece seated on the first seat surface after the second piece seated on the second seat surface. 請求項３に記載した燃料噴射ノズルにおいて、
前記第２ピースの内径側には、前記アウタニードルの閉弁時に、前記第２ピースの先端部が前記第２のシート面に沿ってシート位置を内径側へ移動できる逃げ代が確保されていることを特徴とする燃料噴射ノズル。 The fuel injection nozzle according to claim 3,
On the inner diameter side of the second piece, when the outer needle is closed, a clearance is secured so that the tip of the second piece can move the seat position to the inner diameter side along the second seat surface. A fuel injection nozzle characterized by that. 請求項１〜４に記載した何れかの燃料噴射ノズルにおいて、
前記第２ピースは、反シート側の端部が前記拡大内径部に嵌め込まれる嵌合部として設けられ、その嵌合部より先端側には、前記拡大内径部の内周面と前記第２ピースの外周面との間に隙間が確保されていることを特徴とする燃料噴射ノズル。
In any one of fuel injection nozzles described in Claims 1-4,
The second piece is provided as a fitting portion in which an end portion on the side opposite to the sheet is fitted into the enlarged inner diameter portion, and an inner peripheral surface of the enlarged inner diameter portion and the second piece are provided at a tip side from the fitting portion. A fuel injection nozzle characterized in that a gap is secured between the outer peripheral surface of the fuel injection nozzle.
JP2005328866A 2005-11-14 2005-11-14 Fuel injection nozzle Expired - Fee Related JP4454567B2 (en)

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JP2005328866A JP4454567B2 (en) 2005-11-14 2005-11-14 Fuel injection nozzle
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DE102012205840A1 (en) * 2012-04-11 2013-10-17 Continental Automotive Gmbh Injector for injecting fuel into lifting cylinder combustion engine, in motor car, has valve provided between outer and inner valve needles to control connection between line and hole, where outer valve needle closes valve and another valve
US10392987B2 (en) 2017-03-29 2019-08-27 Cummins Emission Solutions Inc. Assembly and methods for NOx reducing reagent dosing with variable spray angle nozzle
DE102017123315A1 (en) * 2017-10-09 2019-04-11 Man Diesel & Turbo Se Dual-fuel injector, dual-fuel fuel system, internal combustion engine and method of operating the same

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DE4023223A1 (en) * 1990-07-21 1992-01-23 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE10155227A1 (en) * 2001-11-09 2003-05-22 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE10354878A1 (en) * 2003-11-24 2005-06-09 Robert Bosch Gmbh Fuel injection device, in particular for an internal combustion engine with direct fuel injection, and method for their preparation
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