JP2017122453A - Injection valve for four-stroke - Google Patents

Injection valve for four-stroke Download PDF

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Publication number
JP2017122453A
JP2017122453A JP2017000789A JP2017000789A JP2017122453A JP 2017122453 A JP2017122453 A JP 2017122453A JP 2017000789 A JP2017000789 A JP 2017000789A JP 2017000789 A JP2017000789 A JP 2017000789A JP 2017122453 A JP2017122453 A JP 2017122453A
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fuel
opening
diameter
closing
hole
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JP6471373B2 (en
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チュル リ，スー
Soo Chul Lee
チュル リ，スー
エウン リ，サン
Sung Eun Lee
エウン リ，サン
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HANBIT PRECISION Co Ltd
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HANBIT PRECISION Co Ltd
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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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • 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
    • 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
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an injection valve for four-stroke.SOLUTION: The injection valve for four-stroke comprises a stepping holder and a stepping rod 200. The stepping holder has: a base slide hole having a first diameter; a first fuel chamber having a second diameter; a tapered first opening/closing face of which the dimeter is gradually reduced as separating from a fuel chamber; a second fuel chamber having a third diameter; a second opening/closing face having a fourth diameter; a third fuel chamber having a fifth diameter; and a radially-opened injection hole for injecting the fuel from the second opening/closing face toward the external. The stepping rod 200 has: a base portion 210 reciprocating while sliding in the base slide hole; a first opening/closing portion 240 for opening and closing the first opening/closing portion; a fuel inflow portion 250 having a sixth diameter; a second opening/closing portion 260 sliding in the second opening/closing face; a shaft hole 270 formed from an end portion of the second opening/closing face to a prescribed depth of the fuel inflow portion; and a fuel inflow hole 280 formed in the fuel inflow portion to communicate with the shaft hole.SELECTED DRAWING: Figure 4

Description

本発明は、４行程用燃料の噴射のためのインジェクションバルブに関する。 The present invention relates to an injection valve for fuel injection for four strokes.

ディーゼルエンジンは、２行程エンジン及び４行程エンジンに大別され、２行程エンジンは、吸入、圧縮、燃焼、排気のサイクルがピストンの２回の往復で終わり、４行程エンジンは、吸入、圧縮、燃焼、排気のサイクルがピストンの４回の往復で終わる。２行程エンジンは、吸気及び排気のための弁駆動系がないが故にシリンダーヘッドが単純であり、燃焼室には点火プラグのみ存在するが故に、燃焼効率が良好であるとはいえ、構造からみて４行程のレベルまで圧縮比を高め難く、その結果、熱効率及び燃費は低い。４行程エンジンは、吸気弁及び排気弁のそれぞれにおいて、吸入行程において吸気弁が開かれ、排気行程において排気弁が開かれて混合空気及び燃焼ガスを吸気・排気する。４行程エンジンは、ピストンが高速にて往復運動するが故に２行程よりもやや力は弱いとはいえ、高速にて運行可能であることから小型の快速艇などに用いられる。 Diesel engines are broadly divided into two-stroke engines and four-stroke engines. Two-stroke engines end with two strokes of the piston, and the four-stroke engine sucks, compresses and burns. The exhaust cycle ends with four reciprocations of the piston. The two-stroke engine has a simple cylinder head because there is no valve drive system for intake and exhaust, and since only a spark plug exists in the combustion chamber, the combustion efficiency is good. It is difficult to increase the compression ratio to the level of 4 strokes, and as a result, thermal efficiency and fuel consumption are low. In the four-stroke engine, in each of the intake valve and the exhaust valve, the intake valve is opened in the intake stroke, and the exhaust valve is opened in the exhaust stroke to intake and exhaust mixed air and combustion gas. The four-stroke engine is used for small speed boats and the like because it can be operated at a high speed although its force is slightly weaker than the two-stroke because the piston reciprocates at a high speed.

図１は、従来の技術による２行程エンジンが備える燃料噴射用ノズルを示す図である。前記燃料噴射用ノズルは、大韓民国公開特許公報第１０−２０１２−００７４３２７号に開示されているノズルであり、前記ノズルは、バルブハウジング２の端部において中心孔を介して突出するが、その環状の表面３は破線にて示すシリンダーカバー又はシリンダーライダー内の対応する接触表面に対して付勢されて、ノズルボア４付きノズルのティップは燃焼室Ａに突出し、燃料弁が開かれるときに燃料を噴射することが可能になる。前記燃料弁は、スライダーガイド８の底端部に図示の弁のデザインで配設された弁座７及び弁ニードル６を有するバルブスライダー５を備える。前記スライダーガイドは、ノズル１上において上側の対向表面に対して下方に付勢される。 FIG. 1 is a view showing a fuel injection nozzle provided in a conventional two-stroke engine. The nozzle for fuel injection is a nozzle disclosed in Korean Patent Laid-Open No. 10-2012-0074327, and the nozzle protrudes through the center hole at the end of the valve housing 2, but its annular shape The surface 3 is biased against the corresponding contact surface in the cylinder cover or cylinder rider shown in broken lines, the tip of the nozzle with nozzle bore 4 projects into the combustion chamber A and injects fuel when the fuel valve is opened. It becomes possible. The fuel valve comprises a valve slider 5 having a valve seat 7 and a valve needle 6 arranged at the bottom end of a slider guide 8 in the illustrated valve design. The slider guide is biased downward with respect to the upper facing surface on the nozzle 1.

図２は、従来の技術による４行程エンジンが備える燃料噴射用ノズルを示す図である。前記燃料噴射用ノズルは、大韓民国公開特許公報第１０−２０１０−０００２１２７号に開示されているノズルであり、この例のディーゼルエンジン用燃料噴射装置は、燃料が供給されるノズル本体２１（ノズルボディ）と、その内部において移動可能なように配置されるニードルバルブ２２と、を有している。 FIG. 2 is a diagram showing a fuel injection nozzle provided in a four-stroke engine according to the prior art. The fuel injection nozzle is a nozzle disclosed in Korean Patent Publication No. 10-2010-0002127, and the fuel injection device for a diesel engine in this example is a nozzle body 21 (nozzle body) to which fuel is supplied. And a needle valve 22 arranged so as to be movable in the interior thereof.

ノズル本体２１は、先細まりの略円筒状のブロック体であり、その基底端部の中心にはニードルバルブ２２の案内孔２３が形成されている。前記案内孔２３の前側は拡径状の燃料溜まり部２４であり、外部から燃料供給孔２５を介して前記燃料溜まり部２４内に燃料が供給されるようになっている。また、燃料溜まり部２４の先端にはテーパー状のシート部２６が形成されている。前記シート部２６のさらに前側には、燃料溜まり部２４と連通する小径の孔２７が形成されており、前記孔２７の壁部には外部と連通するようにノズル孔２８が形成されている。 The nozzle body 21 is a tapered substantially cylindrical block body, and a guide hole 23 of the needle valve 22 is formed at the center of the base end portion. The front side of the guide hole 23 is a fuel reservoir 24 having an enlarged diameter, and fuel is supplied into the fuel reservoir 24 from the outside through the fuel supply hole 25. A tapered seat portion 26 is formed at the tip of the fuel reservoir portion 24. A small-diameter hole 27 communicating with the fuel reservoir 24 is formed on the front side of the seat portion 26, and a nozzle hole 28 is formed in the wall portion of the hole 27 so as to communicate with the outside.

ニードルバルブ２２は、ノズル本体２１の案内孔２３に摺動自在に保持された丸棒状のベース部３０（ニードルの直径φＤ）と、燃料溜まり部２４の内径よりも直径が小さく、ベース部３０と一体に形成されて、その先端にはノズル本体２１のシート部２６と接触するテーパー状のシート部３１が形成された丸棒状の先端部３２（シート直径φｄ＜φＤ）と、を有している。 The needle valve 22 has a round bar-like base portion 30 (needle diameter φD) slidably held in the guide hole 23 of the nozzle body 21 and a diameter smaller than the inner diameter of the fuel reservoir portion 24. A round bar-like tip portion 32 (sheet diameter φd <φD) formed with a taper-like sheet portion 31 in contact with the sheet portion 26 of the nozzle body 21 is formed at the tip. .

ニードルバルブ２２は、そのシート部３１が、ノズル本体２１のシート部２６と当接する方向にバネなどの付勢手段により荷重Ｗで付勢されており、外力を受けていない状態では、ニードルバルブ２２のシート部３１はノズル本体２１のシート部２６に接触してシート部２６、３１の間を閉鎖していて、燃料溜まり部２４とノズル孔２８との間は遮断されている。 The needle valve 22 is biased with a load W by a biasing means such as a spring in a direction in which the seat portion 31 abuts on the seat portion 26 of the nozzle body 21, and in a state where no external force is received, the needle valve 22. The sheet portion 31 is in contact with the sheet portion 26 of the nozzle body 21 to close the space between the sheet portions 26 and 31, and the fuel reservoir 24 and the nozzle hole 28 are blocked from each other.

燃料の噴射に際しては燃料供給孔２５から所定の圧力の燃料が燃料溜まり部２４内に供給されて、内圧の上昇によりニードルバルブ２２が力を受けて案内孔２３に導かれて上方に移動し、シート部２６、３１の間が開放されてノズル孔２８から外部に燃料が噴射される。 At the time of fuel injection, fuel of a predetermined pressure is supplied from the fuel supply hole 25 into the fuel reservoir 24, the needle valve 22 receives a force due to the increase in internal pressure, is guided to the guide hole 23, and moves upward. The space between the seat portions 26 and 31 is opened, and fuel is injected from the nozzle hole 28 to the outside.

従来の燃料噴射装置における燃料噴射ノズルの先端には、複数の噴霧孔の加工及び流量係数の増大のための袋状の小さな体積部が存在するが、これをノズルサック（ｓａｃ）と呼び、噴射後にサック容積（ｓａｃ ｖｏｌｕｍｅ）に相当する残留燃料オイルが後噴射燃焼を引き起こすため、煤、未燃焼ＨＣなどの燃焼室内の体積物が持続的に発生する。 At the tip of the fuel injection nozzle in the conventional fuel injection device, there is a small bag-like volume for processing a plurality of spray holes and increasing the flow coefficient. This is called a nozzle sac, and the injection Since the residual fuel oil corresponding to the sac volume later causes the post-injection combustion, the volume in the combustion chamber such as soot and unburned HC is continuously generated.

サック容積を減らすと、燃料の噴射が終わった後に後だれが減って炭化水素が減るが、噴霧特性及び噴霧孔間のバラツキは大きくなるという問題がある。 When the sack volume is reduced, the amount of hydrocarbons is reduced after the fuel injection is finished, but there is a problem that the spray characteristics and the variation between the spray holes are increased.

大韓民国公開特許公報第１０−２０１２−００７４３２７号Korean Published Patent Publication No. 10-2012-0074327 大韓民国公開特許公報第１０−２０１０−０００２１２７号Korean Published Patent Publication No. 10-2010-0002127

本発明は、未噴射の燃料が第１の燃料室及び燃料供給流路に逆流することを信頼性よく遮断することのできる４行程用インジェクションバルブを提供することを目的とする。 An object of the present invention is to provide a four-stroke injection valve that can reliably block uninjected fuel from flowing back into the first fuel chamber and the fuel supply flow path.

また、サック容積を減らすとともに、安定的に燃料を噴射孔に噴射することのできる４行程用インジェクションバルブを提供することを目的とする。 It is another object of the present invention to provide a four-stroke injection valve that can reduce the sack volume and stably inject fuel into the injection hole.

本発明は、第１の直径を有するベーススライド孔、第１の直径よりも大きい第２の直径を有する第１の燃料室、燃料室から遠ざかるにつれて直径が小さくなるテーパー状の第１の開閉面、第１及び第２の直径よりも小さい第３の直径を有する第２の燃料室、第３の直径よりも小さい第４の直径を有する第２の開閉面、第４の直径よりも大きく、且つ、第３の直径よりも小さい第５の直径を有する第３の燃料室及び第２の開閉面から外部に向かって燃料を噴射できるように放射状に形成される噴射孔を有するステッピングホルダーと、ベーススライド孔と摺動しながら往復運動するベース部、第１の開閉部を開閉する第１の開閉部、第３の直径及び第４の直径よりも小さい第６の直径を有する燃料流入部、第２の開閉面と摺動する第２の開閉部、第２の開閉面の端部から燃料流入部の所定の深さまで形成される軸孔及び軸孔と連通するように燃料流入部に形成される燃料流入孔を有するステッピングロッドと、を備えることを特徴とする４行程用インジェクションバルブを提供する。 The present invention relates to a base slide hole having a first diameter, a first fuel chamber having a second diameter larger than the first diameter, and a tapered first opening / closing surface having a diameter that decreases as the distance from the fuel chamber increases. A second fuel chamber having a third diameter smaller than the first and second diameters, a second opening / closing surface having a fourth diameter smaller than the third diameter, larger than the fourth diameter, And a stepping holder having a third fuel chamber having a fifth diameter smaller than the third diameter and injection holes formed radially so that fuel can be injected outward from the second opening / closing surface; A base portion that reciprocates while sliding with the base slide hole, a first opening / closing portion that opens / closes the first opening / closing portion, a fuel inflow portion having a third diameter and a sixth diameter smaller than the fourth diameter, Second opening / closing part sliding with second opening / closing surface A shaft hole formed from an end of the second opening / closing surface to a predetermined depth of the fuel inflow portion, and a stepping rod having a fuel inflow hole formed in the fuel inflow portion so as to communicate with the shaft hole. A characteristic four-stroke injection valve is provided.

また、本発明の他の態様は、ステッピングホルダーは、第１の燃料室に燃料を供給する燃料流入流路をさらに備えることを特徴とする４行程用インジェクションバルブを提供する。 According to another aspect of the present invention, there is provided a four-stroke injection valve, wherein the stepping holder further includes a fuel inflow channel for supplying fuel to the first fuel chamber.

さらに、本発明の他の態様は、ステッピングロッドは、第２の開閉部に潤滑溝をさらに備えることを特徴とする４行程用インジェクションバルブを提供する。   Furthermore, another aspect of the present invention provides a four-stroke injection valve, wherein the stepping rod further includes a lubricating groove in the second opening / closing portion.

さらにまた、本発明の他の態様は、潤滑溝は、ノズルの閉鎖に際してステッピングホルダーの噴射孔及び第２の燃料室と遭遇しない個所に形成されることを特徴とする４行程用インジェクションバルブを提供する。   Still further, according to another aspect of the present invention, there is provided a four-stroke injection valve characterized in that the lubrication groove is formed at a position where it does not encounter the injection hole of the stepping holder and the second fuel chamber when the nozzle is closed. To do.

本発明が提供する４行程用インジェクションバルブは、未噴射の燃料が噴射孔の周りにおいて一回、第１の燃料室の周りにおいてもう一回（すなわち、二重に）遮断されて第１の燃料室及び燃料供給流路に逆流することを信頼性よく遮断することができる。 In the four-stroke injection valve provided by the present invention, uninjected fuel is shut off once around the injection hole and once around the first fuel chamber (that is, doubly). Backflow to the chamber and the fuel supply channel can be reliably blocked.

また、本発明が提供する４行程用インジェクションバルブは、燃料室と噴射孔との間が二重に遮断されることにより、汚泥の発生を防ぐことができてステッピングホルダー及びステッピングロッドの耐摩耗性を向上させることができる。 In addition, the four-stroke injection valve provided by the present invention can prevent the generation of sludge by double blocking between the fuel chamber and the injection hole, and wear resistance of the stepping holder and the stepping rod. Can be improved.

さらに、本発明が提供する４行程用インジェクションバルブは、逆流ガスの流入を防ぐことにより、ステッピングロッド及びステッピングホルダーの脱炭を防ぐことができ、これにより、摺動面の寿命を延ばすことができる。 Further, the four-stroke injection valve provided by the present invention can prevent decarburization of the stepping rod and the stepping holder by preventing the inflow of the backflow gas, thereby extending the life of the sliding surface. .

さらにまた、後噴射燃焼の原因となるサック容積を減らすことができて、ＮＯｘ、ＣＯ、スモーク、未燃焼ＨＣ及び燃焼室内の堆積物を減らしてシリンダーの作動条件を改善することができる。 Furthermore, the sack volume that causes post-injection combustion can be reduced, and NOx, CO, smoke, unburned HC and deposits in the combustion chamber can be reduced to improve the operating conditions of the cylinder.

加えて、ステッピングホルダーとステッピングロッドとの間に潤滑溝を備えることにより、摩擦熱の発生を減らして、ステッピングホルダーとステッピングロッドとの間の公差をタイトに設定することにより、燃料ガスの逆流を防ぐことができる。 In addition, by providing a lubrication groove between the stepping holder and the stepping rod, the generation of frictional heat is reduced, and the tolerance between the stepping holder and the stepping rod is set tight, thereby reducing the back flow of the fuel gas. Can be prevented.

従来の技術による２行程エンジンが備える燃料噴射用ノズルを示す図である。It is a figure which shows the nozzle for fuel injection with which the 2-stroke engine by a prior art is provided. 従来の技術による４行程エンジンが備える燃料噴射用ノズルを示す図である。It is a figure which shows the nozzle for fuel injection with which the 4-stroke engine by a prior art is provided. 本発明の第１の実施形態による４行程用インジェクションバルブのステッピングホルダーを示す図である。It is a figure which shows the stepping holder of the injection valve for four strokes by the 1st Embodiment of this invention. 本発明の第１の実施形態による４行程用インジェクションバルブのステッピングロッドを示す図である。It is a figure which shows the stepping rod of the injection valve for four strokes by the 1st Embodiment of this invention. 本発明の第１の実施形態による４行程インジェクションバルブが遮断された様子を示す図である。It is a figure which shows a mode that the 4-stroke injection valve by the 1st Embodiment of this invention was interrupted | blocked. 本発明の第１の実施形態による４行程インジェクションバルブが開放された様子を示す図である。It is a figure which shows a mode that the 4-stroke injection valve by the 1st Embodiment of this invention was open | released. 本発明の第２の実施形態による４行程用インジェクションバルブのステッピングロッドを示す図である。It is a figure which shows the stepping rod of the injection valve for 4 strokes by the 2nd Embodiment of this invention.

以下、添付図面に基づき、本発明を詳述する。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

図３は、本発明の第１の実施形態による４行程用インジェクションバルブのステッピングホルダーを示す図である。 FIG. 3 is a view showing a stepping holder of a four-stroke injection valve according to the first embodiment of the present invention.

本発明に係るインジェクションバルブは、軸方向に後述するステッピングロッド２００（図４参照）を収容するための摺動孔が形成されるステッピングホルダー１００と、摺動孔の内に嵌め込まれて摺動しながら燃料の噴射を制御するステッピングロッド２００（図４参照）と、を備える。 The injection valve according to the present invention slides by being fitted into the stepping holder 100 in which a sliding hole for accommodating a stepping rod 200 (see FIG. 4) described later in the axial direction is formed, and the sliding hole. And a stepping rod 200 (see FIG. 4) that controls fuel injection.

ステッピングホルダー１００に形成される摺動孔は、上部から順番に、第１の直径を有するベーススライド孔１１０、第１の直径よりも大きい第２の直径を有する第１の燃料室１２０、第１の燃料室１２０から遠ざかるにつれて直径が小さくなるテーパー状の第１の開閉面１４０、第１及び第２の直径よりも小さい第３の直径を有する第２の燃料室１５０、第３の直径よりも小さい第４の直径を有する第２の開閉面１６０及び第４の直径よりも大きく、且つ、第３の直径よりも小さい第５の直径を有する第３の燃料室１７０からなる。ここで、上部とは、図中の上部に示す個所のことをいう。また、燃料を流入させる燃料流入流路１３０が第１の燃料室１２０と連通するように斜めに形成される。なお、ステッピングホルダー１００は、外部に燃料を噴射できるように第２の開閉面１６０に放射状に形成される噴射孔１８０をさらに備える。 The slide holes formed in the stepping holder 100 are, in order from the top, a base slide hole 110 having a first diameter, a first fuel chamber 120 having a second diameter larger than the first diameter, a first A first opening / closing surface 140 having a tapered shape whose diameter decreases as the distance from the fuel chamber 120 increases, a second fuel chamber 150 having a third diameter smaller than the first and second diameters, and a diameter larger than the third diameter. The second opening / closing surface 160 has a small fourth diameter, and the third fuel chamber 170 has a fifth diameter larger than the fourth diameter and smaller than the third diameter. Here, the upper part means the part shown in the upper part of the figure. In addition, a fuel inflow passage 130 through which fuel flows is formed obliquely so as to communicate with the first fuel chamber 120. The stepping holder 100 further includes injection holes 180 that are formed radially on the second opening / closing surface 160 so that fuel can be injected outside.

図４は、本発明の第１の実施形態による４行程用インジェクションバルブのステッピングロッドを示す図である。 FIG. 4 is a view showing a stepping rod of the four-stroke injection valve according to the first embodiment of the present invention.

ステッピングロッド２００は、ベーススライド孔１１０（図３参照）と摺動しながら往復運動するベース部２１０、第１の開閉面１４０（図３参照）を開閉する第１の開閉部２４０、第３の直径及び第４の直径よりも小さい第５の直径を有する燃料流入部２５０、第２の開閉面と摺動する第２の開閉部２６０、第２の開閉面の端部から燃料流入部の所定の深さまで形成される軸孔２７０及び軸孔２７０と連通するように燃料流入部２５０に形成される燃料流入孔２８０を上部からこの順に備える。 The stepping rod 200 includes a base portion 210 that reciprocates while sliding with the base slide hole 110 (see FIG. 3), a first opening / closing portion 240 that opens and closes a first opening / closing surface 140 (see FIG. 3), and a third A fuel inflow portion 250 having a fifth diameter smaller than the diameter and the fourth diameter, a second opening / closing portion 260 that slides with the second opening / closing surface, and a predetermined portion of the fuel inflow portion from the end of the second opening / closing surface A fuel hole 280 formed in the fuel inflow portion 250 is provided in this order from the top so as to communicate with the shaft hole 270 and the shaft hole 270.

第１の開閉部２４０は、第１の開閉面１４０を開閉するために、第１の開閉面１４０と対応するテーパー状に形成される。第１の開閉部２４０及び第１の開閉面１４０が密着して閉鎖されたとき、燃料が一時的に貯留される第１の燃料室１２０の空間を十分に確保できるように、第１の開閉部２４０の軸方向の長さは、第１の開閉面１４０の軸方向の長さよりも短い。 The first opening / closing part 240 is formed in a tapered shape corresponding to the first opening / closing surface 140 in order to open / close the first opening / closing surface 140. When the first opening / closing part 240 and the first opening / closing surface 140 are closed in close contact with each other, the first opening / closing is performed so that a sufficient space can be secured in the first fuel chamber 120 in which fuel is temporarily stored. The length of the portion 240 in the axial direction is shorter than the length of the first opening / closing surface 140 in the axial direction.

このため、第１の開閉部２４０の最大の直径と同じ直径を有する中間部２３０は、第１の燃料室１２０よりも小さい直径を有する。したがって、中間部２３０と第１の燃料室１２０との間の空間が燃料を一時的に貯留するのに用いられる。このとき、燃料貯留空間を 十分に確保するために、中間部２３０とベース部２１０との間に中間部２３０よりも直径が小さい小径部２２０がさらに配設されてもよい。 Therefore, the intermediate part 230 having the same diameter as the maximum diameter of the first opening / closing part 240 has a smaller diameter than the first fuel chamber 120. Therefore, the space between the intermediate portion 230 and the first fuel chamber 120 is used for temporarily storing fuel. At this time, a small-diameter portion 220 having a smaller diameter than the intermediate portion 230 may be further disposed between the intermediate portion 230 and the base portion 210 in order to ensure a sufficient fuel storage space.

第１の開閉部２４０の下部には、第１の開閉部２４０の最も小さい直径よりもさらに直径が小さい燃料流入部２５０が形成される。燃料流入部２５０は、第２の燃料室１５０及び第２の開閉面１６０よりもさらに小さい直径を有する。燃料流入部２５０の下部には、第２の開閉面１６０と摺動する第２の開閉部２６０が形成される。 A fuel inflow portion 250 having a smaller diameter than the smallest diameter of the first opening / closing portion 240 is formed below the first opening / closing portion 240. The fuel inflow portion 250 has a smaller diameter than the second fuel chamber 150 and the second opening / closing surface 160. A second opening / closing portion 260 that slides on the second opening / closing surface 160 is formed below the fuel inflow portion 250.

ステッピングロッド２００の最下端部、すなわち、第２の開閉部２６０の下端から燃料流入部２５０の所定の位置まで軸孔２７０が形成される。なお、軸孔２７０と連通するように、燃料流入部２５０に複数の燃料流入孔２８０が形成される。 A shaft hole 270 is formed from the lowermost end portion of the stepping rod 200, that is, from the lower end of the second opening / closing portion 260 to a predetermined position of the fuel inflow portion 250. A plurality of fuel inflow holes 280 are formed in the fuel inflow portion 250 so as to communicate with the shaft hole 270.

図５は、本発明の第１の実施形態による４行程インジェクションバルブが遮断された様子を示す図であり、図６は、本発明の第１の実施形態による４行程インジェクションバルブが開放された様子を示す図である。図３から図６を参照して、本発明の第１の実施形態による４行程インジェクションバルブの作動について説明する。 FIG. 5 is a diagram illustrating a state where the four-stroke injection valve according to the first embodiment of the present invention is shut off, and FIG. 6 is a diagram illustrating a state where the four-stroke injection valve according to the first embodiment of the present invention is opened. FIG. The operation of the four-stroke injection valve according to the first embodiment of the present invention will be described with reference to FIGS.

ベーススライド孔１１０は、後述するステッピングロッドのベース部２１０が摺動する部分であり、ステッピングロッド２００が上下に往復運動するように案内する役割を果たす。ステッピングロッド２００は、ベース部２１０の上部に配設されてバネと連結される連結軸２９０を備え、連結軸２９０から伝わる動力を受け取って上下に往復運動しながら噴射孔１８０を開閉する。第１の燃料室１２０は、燃料流入流路１３０を介して流入した燃料が一時的に貯留される個所であり、第１の燃料室１２０に燃料が溜まって安定的に燃料が噴射されるようにする。第１の開閉面１４０はテーパー状を呈し、第１の開閉面１４０と同様にテーパー状を呈するステッピングロッドの第１の開閉部２４０との接離を繰り返し行い、第１の燃料室１２０と第２の燃料室１５０との間を開閉する。第２の燃料室１５０は、第１の開閉面１４０と第１の開閉部２４０が分離されると、第１の燃料室１２０と連通して第１の燃料室１２０に溜まった燃料が流入する。燃料は、第２の燃料室１５０から燃料流入孔２８０及び軸孔２７０を介して第３の燃料室１７０に流動して、第３の燃料室１７０にも一時的に溜まることがある。第３の燃料室１７０は、弁の閉鎖時に既に噴射された燃料を一時的に収容可能な空間である。 The base slide hole 110 is a portion where a base portion 210 of a stepping rod described later slides, and plays a role of guiding the stepping rod 200 so as to reciprocate up and down. The stepping rod 200 includes a connecting shaft 290 disposed on the upper portion of the base portion 210 and connected to a spring. The stepping rod 200 receives power transmitted from the connecting shaft 290 and opens and closes the injection hole 180 while reciprocating up and down. The first fuel chamber 120 is a place where the fuel flowing in via the fuel inflow channel 130 is temporarily stored, so that the fuel is stored in the first fuel chamber 120 and the fuel is stably injected. To. The first opening / closing surface 140 has a taper shape, and similarly to the first opening / closing surface 140, the stepping rod having a taper shape is repeatedly contacted and separated from the first opening / closing portion 240, and the first fuel chamber 120 and the first opening / closing surface 140 have The two fuel chambers 150 are opened and closed. In the second fuel chamber 150, when the first opening / closing surface 140 and the first opening / closing portion 240 are separated, the fuel accumulated in the first fuel chamber 120 flows into the first fuel chamber 120. . The fuel may flow from the second fuel chamber 150 to the third fuel chamber 170 via the fuel inflow hole 280 and the shaft hole 270 and temporarily accumulate in the third fuel chamber 170. The third fuel chamber 170 is a space that can temporarily store fuel that has already been injected when the valve is closed.

ステッピングロッド２００が下死点に位置するときに第１の開閉面１４０及び第２の開閉面１６０は両方とも閉鎖され、噴射孔１８０を介して燃料が噴射されない。 When the stepping rod 200 is located at the bottom dead center, both the first opening / closing surface 140 and the second opening / closing surface 160 are closed, and fuel is not injected through the injection hole 180.

第２の開閉面１６０は、燃料の逆流を遮断するのに十分な面積を有するように十分な長さに形成される。すなわち、図３に示すように、第１の燃料室１２０、第１の開閉面１４０、第２の燃料室１５０の長さよりも第２の開閉面１６０の長さの方がさらに大きい。また、ステッピングロッド２００のストローク長さよりも十分に大きいことが好ましい。第２の開閉面１６０の長さは第２の開閉部２６０の長さと等しく、第２の開閉面１６０と第２の開閉部２６０との間の接触面積が十分に確保されてエンジンから噴射孔１８０を介して燃料が逆流することを遮断することができる。 The second opening / closing surface 160 is formed to have a sufficient length so as to have an area sufficient to block the backflow of fuel. That is, as shown in FIG. 3, the length of the second opening / closing surface 160 is longer than the length of the first fuel chamber 120, the first opening / closing surface 140, and the second fuel chamber 150. Moreover, it is preferable that it is sufficiently larger than the stroke length of the stepping rod 200. The length of the second opening / closing surface 160 is equal to the length of the second opening / closing portion 260, and a sufficient contact area is ensured between the second opening / closing surface 160 and the second opening / closing portion 260, so It is possible to prevent the fuel from flowing back through 180.

また、第１の開閉面１４０と第１の開閉部１６０との接触により第２の燃料室１５０から第１の燃料室１２０への燃料の逆流が遮断される。 Further, the backflow of fuel from the second fuel chamber 150 to the first fuel chamber 120 is blocked by the contact between the first opening / closing surface 140 and the first opening / closing portion 160.

このように二重に燃料流入流路１３０及び噴射孔１８０が遮断されるので、燃料の逆流を確実に遮断することができるだけではなく、燃料の漏れを防ぐことができる。また、燃料の逆流が遮断されるので、汚泥の発生を防ぐことができてノズルの耐摩耗性を向上させることができる。なお、逆流ガスによる脱炭を防ぐことができて、摺動面の寿命を延ばすことができるというメリットがある。 Since the fuel inflow channel 130 and the injection hole 180 are shut off in this way, not only can the fuel backflow be reliably shut off, but also the leakage of the fuel can be prevented. In addition, since the backflow of fuel is blocked, the generation of sludge can be prevented and the wear resistance of the nozzle can be improved. In addition, there exists a merit that the decarburization by backflow gas can be prevented and the lifetime of a sliding surface can be extended.

さらに、後噴射燃焼の原因となるサック容積を減らすことができて、ＮＯｘ、ＣＯ、スモーク、未燃焼ＨＣ及び燃焼室内の堆積物を減らしてシリンダーの作動条件を改善することができるという効果がある。 Further, the sack volume that causes post-injection combustion can be reduced, and NOx, CO, smoke, unburned HC, and deposits in the combustion chamber can be reduced to improve the operating conditions of the cylinder. .

図６を参照すると、弁が開放されたとき、燃料流入流路１３０を介して流入した燃料は第１の燃料室１２０を経て、第１の開閉面１４０と第１の開閉部２４０との間の空間を通って第２の燃料室１５０に流入する。また、第２の燃料室１５０から燃料流入孔２８０及び軸孔２７０を経て噴射孔１８０を介してエンジンの内部に燃料が噴射される。このとき、軸孔２７０の最下端部は、下部に進むにつれて軸孔２７０の直径が次第に大きくなることが好ましい。このような形状により、燃料の流動を円滑にして噴射孔１８０を介した燃料の噴霧量を増やすことができる。 Referring to FIG. 6, when the valve is opened, the fuel that has flowed in through the fuel inflow passage 130 passes through the first fuel chamber 120 and is between the first opening / closing surface 140 and the first opening / closing portion 240. Into the second fuel chamber 150 through the space. Further, fuel is injected from the second fuel chamber 150 into the engine through the fuel inflow hole 280 and the shaft hole 270 through the injection hole 180. At this time, it is preferable that the diameter of the shaft hole 270 gradually increases as the lowermost end portion of the shaft hole 270 progresses downward. With such a shape, the flow of fuel can be made smooth and the amount of fuel sprayed through the injection hole 180 can be increased.

図７は、本発明の第２の実施形態による４行程用インジェクションバルブのステッピングロッドを示す図である。 FIG. 7 is a view showing a stepping rod of a four-stroke injection valve according to the second embodiment of the present invention.

本発明の第２の実施形態による４行程用インジェクションバルブは、ステッピングロッド２００の第２の開閉部２６０に１以上の潤滑溝２６０ａを形成したことを除いては、第１の実施形態と構成要素及び動作原理が同様である。４行程用エンジンは高速にて作動され、これにより、エンジン内に燃料を噴射するノズルのステッピングロッド２００もまたステッピングホルダー１００（図３から図６参照）に沿って高速にて往復運動することになる。これにより、ステッピングロッド２００及びステッピングホルダー１００が過熱され、ほとんどの４行程用ノズルは冷却流路を備えている。本発明の第２の実施形態による４行程用インジェクションバルブのステッピングロッド２００は、特に、ステッピングロッド２００とステッピングホルダー１００との間の摩擦面積が大きい第２の開閉面１６０及び第２の開閉部２６０における摩擦熱を減らすために、第２の開閉部２６０に潤滑のための１以上の潤滑溝２６０ａを備える。図７に示すように、潤滑溝２６０ａは、第２の開閉部２６０の外周に沿ってリング状に形成されてもよい。しかしながら、図７に示す形状に加えて、窪み状や螺旋状など、ステッピングロッド２００とステッピングホルダー１００との間の摩擦熱を減らし、円滑な往復運動を補助する形状であれば、いかなる形状であっても構わない。 The four-stroke injection valve according to the second embodiment of the present invention is the same as that of the first embodiment except that one or more lubricating grooves 260a are formed in the second opening / closing portion 260 of the stepping rod 200. And the principle of operation is the same. The four-stroke engine is operated at high speed, so that the nozzle stepping rod 200 for injecting fuel into the engine also reciprocates at high speed along the stepping holder 100 (see FIGS. 3 to 6). Become. As a result, the stepping rod 200 and the stepping holder 100 are overheated, and most of the four-stroke nozzles are provided with cooling channels. In particular, the stepping rod 200 of the four-stroke injection valve according to the second embodiment of the present invention has a second opening / closing surface 160 and a second opening / closing portion 260 having a large friction area between the stepping rod 200 and the stepping holder 100. In order to reduce frictional heat, the second opening / closing portion 260 is provided with one or more lubricating grooves 260a for lubrication. As shown in FIG. 7, the lubricating groove 260 a may be formed in a ring shape along the outer periphery of the second opening / closing part 260. However, in addition to the shape shown in FIG. 7, any shape such as a hollow shape or a spiral shape can be used as long as it reduces frictional heat between the stepping rod 200 and the stepping holder 100 and assists smooth reciprocating motion. It doesn't matter.

但し、第２の開閉面１６０及び第２の開閉部２６０は信頼性よく燃料の逆流及び漏れを遮断しなければならないため、潤滑溝２６０ａは、ステッピングロッド２００のノズルの閉鎖に際してステッピングホルダー１００の噴射孔１８０及び第２の燃料室１５０と遭遇しない個所に形成されなければならない。 However, since the second opening / closing surface 160 and the second opening / closing portion 260 must reliably block the backflow and leakage of fuel, the lubrication groove 260a is injected by the stepping holder 100 when the nozzle of the stepping rod 200 is closed. It must be formed where it does not encounter the hole 180 and the second fuel chamber 150.

このように、ステッピングロッド２００の第２の開閉部２６０に潤滑溝２６０ａを形成することにより、第２の開閉部２６０と第２の開閉面１６０との間に潤滑及び冷却が行われる結果、さらに精度よい公差で結合可能であり、これにより、第２の開閉部２６０及び第２の開閉面１６０による逆流防止機能をさらに向上させることができる。



As described above, by forming the lubrication groove 260a in the second opening / closing portion 260 of the stepping rod 200, lubrication and cooling are performed between the second opening / closing portion 260 and the second opening / closing surface 160. It is possible to couple with a precise tolerance, and thereby the backflow prevention function by the second opening / closing part 260 and the second opening / closing surface 160 can be further improved.



Claims (4)

第１の直径を有するベーススライド孔、第１の直径よりも大きい第２の直径を有する第１の燃料室、燃料室から遠ざかるにつれて直径が小さくなるテーパー状の第１の開閉面、第１及び第２の直径よりも小さい第３の直径を有する第２の燃料室、第３の直径よりも小さい第４の直径を有する第２の開閉面、第４の直径よりも大きく、且つ、第３の直径よりも小さい第５の直径を有する第３の燃料室及び第２の開閉面から外部に向かって燃料を噴射できるように放射状に形成される噴射孔を有するステッピングホルダーと、
ベーススライド孔と摺動しながら往復運動するベース部、第１の開閉部を開閉する第１の開閉部、第３の直径及び第４の直径よりも小さい第６の直径を有する燃料流入部、第２の開閉面と摺動する第２の開閉部、第２の開閉面の端部から燃料流入部の所定の深さまで形成される軸孔及び軸孔と連通するように燃料流入部に形成される燃料流入孔を有するステッピングロッドと、
を備えることを特徴とする４行程用インジェクションバルブ。 A base slide hole having a first diameter, a first fuel chamber having a second diameter larger than the first diameter, a tapered first opening / closing surface having a diameter that decreases as the distance from the fuel chamber increases, A second fuel chamber having a third diameter smaller than the second diameter, a second opening / closing surface having a fourth diameter smaller than the third diameter, larger than the fourth diameter, and third A stepping holder having a third fuel chamber having a fifth diameter smaller than the diameter of the first fuel chamber and injection holes formed radially so that fuel can be injected outward from the second opening / closing surface;
A base portion that reciprocates while sliding with the base slide hole, a first opening / closing portion that opens / closes the first opening / closing portion, a fuel inflow portion having a third diameter and a sixth diameter smaller than the fourth diameter, A second opening / closing portion that slides with the second opening / closing surface, a shaft hole formed from an end of the second opening / closing surface to a predetermined depth of the fuel inflow portion, and a fuel inflow portion that communicates with the shaft hole A stepping rod having a fuel inflow hole,
A four-stroke injection valve characterized by comprising: ステッピングホルダーは、第１の燃料室に燃料を供給する燃料流入流路をさらに備えることを特徴とする請求項１に記載の４行程用インジェクションバルブ。 The four-stroke injection valve according to claim 1, wherein the stepping holder further includes a fuel inflow passage for supplying fuel to the first fuel chamber. ステッピングロッドは、第２の開閉部に潤滑溝をさらに備えることを特徴とする請求項１に記載の４行程用インジェクションバルブ。 The four-stroke injection valve according to claim 1, wherein the stepping rod further includes a lubrication groove in the second opening / closing portion. 潤滑溝は、ノズルの閉鎖に際してステッピングホルダーの噴射孔及び第２の燃料室と遭遇しない個所に形成されることを特徴とする請求項３に記載の４行程用インジェクションバルブ。 4. The four-stroke injection valve according to claim 3, wherein the lubrication groove is formed at a position where it does not encounter the injection hole of the stepping holder and the second fuel chamber when the nozzle is closed.
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