JPH04143455A - Fuel injection nozzle - Google Patents
Fuel injection nozzleInfo
- Publication number
- JPH04143455A JPH04143455A JP26723890A JP26723890A JPH04143455A JP H04143455 A JPH04143455 A JP H04143455A JP 26723890 A JP26723890 A JP 26723890A JP 26723890 A JP26723890 A JP 26723890A JP H04143455 A JPH04143455 A JP H04143455A
- Authority
- JP
- Japan
- Prior art keywords
- needle valve
- fuel
- nozzle
- tip
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 61
- 238000002347 injection Methods 0.000 title claims abstract description 16
- 239000007924 injection Substances 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 4
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 230000001627 detrimental effect Effects 0.000 abstract 2
- 239000006185 dispersion Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ディーゼルエンジンに使用される燃料噴射ノ
ズルの改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in fuel injection nozzles used in diesel engines.
（従来の技術）
ディーゼルエンジンの燃焼室に燃料を噴射する燃料噴射
ノズルは例えば第５図に示すように構成されている（米
国特許第４７１５５４１号）。(Prior Art) A fuel injection nozzle for injecting fuel into a combustion chamber of a diesel engine is configured as shown in FIG. 5, for example (US Pat. No. 4,715,541).
すなわち、先端を密閉した中空の筒状のノズルボディ２
の先端に放射方向に複数の噴孔１ｏを設け、ノズルボデ
ィ２の内側に収装した針弁４ｏが輪方向位置に応じてこ
の噴孔１ｏを開閉するようになっている。That is, a hollow cylindrical nozzle body 2 with a sealed tip.
A plurality of nozzle holes 1o are provided in the radial direction at the tip of the nozzle body 2, and a needle valve 4o housed inside the nozzle body 2 opens and closes the nozzle holes 1o according to the position in the ring direction.
針弁４０はノズルボディ２の２１所に形成したガイド３
と５により摺動自由に支持され、高圧燃料はノズルボデ
ィ２に形成した通路８からガイド３と５の間の油溜り１
２と、ガイド５の上下を連通する針弁４０に形成した溝
４１と、針弁４ｏとノズルボディ２の間に形成される環
状層間４２を介して噴孔１０に供給される。The needle valve 40 is a guide 3 formed at 21 locations on the nozzle body 2.
and 5, and the high pressure fuel flows from the passage 8 formed in the nozzle body 2 to the oil reservoir 1 between the guides 3 and 5.
2, a groove 41 formed in the needle valve 40 that communicates with the upper and lower parts of the guide 5, and an annular interlayer 42 formed between the needle valve 4o and the nozzle body 2.
針弁４０には燃料圧力で針弁４ｏを基端方向に付勢する
受圧部４３が形成される。また、針弁４０を先端方向に
付勢する第１のスプリング２２がノズルボディ２を保持
するホルダ４４と針弁４゜の基端との間に介装される。The needle valve 40 is formed with a pressure receiving part 43 that urges the needle valve 4o in the proximal direction using fuel pressure. Further, a first spring 22 that biases the needle valve 40 in the distal direction is interposed between a holder 44 that holds the nozzle body 2 and the base end of the needle valve 4°.
さらに、後退した針弁４０を第２のスプリング２４がス
トッパ４５を介して先端方向に支持するようになってい
る。Furthermore, the second spring 24 supports the retracted needle valve 40 in the distal direction via a stopper 45.
燃料の噴射初期には針弁４０がまず受圧部４３に作用す
る燃料圧力により第１のスプリング２２を収縮させて図
の上方へとわずかに変位し、ノズルボディ２の先端部２
Ａと針弁４０の先端部９の間に形成される狭い隙間を介
して燃料が噴孔１０から燃焼室内に噴出する。At the beginning of fuel injection, the needle valve 40 first contracts the first spring 22 due to the fuel pressure acting on the pressure receiving part 43 and is slightly displaced upward in the figure, causing the tip 2 of the nozzle body 2 to contract.
Fuel is ejected from the nozzle hole 10 into the combustion chamber through a narrow gap formed between the needle valve A and the tip 9 of the needle valve 40.
そして、受圧部４３に作用する燃料圧力が上昇すると針
弁４０は＠２のスプリング２４をも押し縮めつつさらに
後退し、先端部２Ａと９の隙間を広げて噴孔１０からの
燃料の噴射量を増加させる。Then, when the fuel pressure acting on the pressure receiving part 43 increases, the needle valve 40 also compresses the spring 24 @2 and retreats further, widening the gap between the tips 2A and 9 and increasing the amount of fuel injected from the nozzle hole 10. increase.
なお、このように噴孔１０の開度を燃料圧力に応じて２
段階に変化させることで初期のり７ト量が小さくなり、
燃焼がス中の窒素酸化物（ＮＯｘ）を低減することがで
きる。In addition, in this way, the opening degree of the nozzle hole 10 can be changed by 2 depending on the fuel pressure.
By changing it in stages, the initial amount of glue becomes smaller,
Nitrogen oxides (NOx) in combustion gas can be reduced.
（発明の課題）
しかしながら、この燃料噴射ノズルの場合には燃料圧力
を受は止める受圧部４３と第１のスプリング２２の反発
力を受は止める針弁４０の基端部との距離りが大きいた
めに、針弁４０がノズルボディ２に対して偏心しやすく
、偏心によりガイド３及び５と針弁４０との摺動摩擦抵
抗が増加して針弁４０の閉弁時の応答性が低下したり、
噴孔１０からの燃料噴射が不拘−になり、結果としてス
モークや炭化水素の発生を増加させる恐れがあった。(Problem to be solved by the invention) However, in the case of this fuel injection nozzle, there is a large distance between the pressure receiving part 43 that receives the fuel pressure and the base end of the needle valve 40 that receives the repulsive force of the first spring 22. Therefore, the needle valve 40 tends to become eccentric with respect to the nozzle body 2, and the sliding friction resistance between the guides 3 and 5 and the needle valve 40 increases due to the eccentricity, and the responsiveness of the needle valve 40 when closing the valve decreases. ,
Fuel injection from the nozzle hole 10 becomes unresponsive, and as a result, there is a fear that the generation of smoke and hydrocarbons will increase.
本発明は、以上のＮＲ１［を解決するためになされたも
ので、針弁の偏心を抑制して有害物質の発生を低減する
ことを目的とする。The present invention has been made to solve the above-mentioned problem NR1, and aims to suppress the eccentricity of the needle valve and reduce the generation of harmful substances.
（課題を達成するための手段）
本発明は、先端を密閉した筒状のノズルボディの先端部
に燃料を噴射する噴孔を放射状に形成し、これらの噴孔
を軸方向位置に応じて開閉する針弁をノズルボディの内
側に形成したガイドで摺動自由に支持し、ノズルボディ
と針弁の間を通って噴孔に導かれる高圧燃料に接して針
弁を基端方向へ付勢する受圧部を針弁に形成する一方、
針弁を先端方向へ付勢するスプリングを備えた燃料噴射
ノズルにおいて、前記ガイドに摺接する針弁の摺接部に
ガイドに臨んで等しい角度間隔で複数の四部を形成し、
各四部に高圧燃料を導く通路を針弁の内部に形成してい
る。(Means for Achieving the Object) The present invention forms nozzle holes for injecting fuel in a radial manner at the tip of a cylindrical nozzle body with a sealed tip, and opens and closes these nozzle holes depending on the axial position. The needle valve is supported in a freely sliding manner by a guide formed inside the nozzle body, and the needle valve is urged toward the proximal end when it comes into contact with high-pressure fuel that passes between the nozzle body and the needle valve and is guided to the nozzle hole. While the pressure receiving part is formed into a needle valve,
In a fuel injection nozzle equipped with a spring that biases the needle valve toward the tip, a plurality of four parts facing the guide are formed at equal angular intervals on the sliding contact part of the needle valve that slides in contact with the guide,
A passage for introducing high-pressure fuel to each of the four parts is formed inside the needle valve.
（作用）
摺接部に形成した四部を介してガイドと摺接部の間に燃
料の圧力を作用させることにより静圧軸受が構成され、
針弁が偏心しにくくなり、針弁とガイドとの摺動がスム
ーズになる。(Function) A hydrostatic bearing is constructed by applying fuel pressure between the guide and the sliding contact via the four parts formed in the sliding contact.
The needle valve is less likely to become eccentric, and the needle valve and guide slide smoothly.
（実施例） ＭＳ１図及び第２図に本発明の第１の実施例を示す。(Example) A first embodiment of the present invention is shown in FIGS. 1 and 2.
第１図において、１は針弁、２は針弁１を収装したノズ
ルボディである。ノズルボディ２は中空の筒形に形成さ
れ、針弁１に形成された大径の摺接部６と７と８をそれ
ぞれがイド３と４と５において摺動自由に支持する。In FIG. 1, 1 is a needle valve, and 2 is a nozzle body in which the needle valve 1 is housed. The nozzle body 2 is formed into a hollow cylindrical shape, and supports large-diameter sliding contact parts 6, 7, and 8 formed in the needle valve 1 so as to freely slide on the id 3, 4, and 5, respectively.
ノズルボディ２の先端部２Ａは円錐状に閉じ、この先端
部２Ａ！、：ＩＩ！数の噴孔１０が放射状に形成される
。また、針弁１の先端部９も円錐形に形成され、噴孔１
０はこの先端部９がノズルボディ２の先端部２Ａの内側
に接することでｗｇ鎖される。The tip 2A of the nozzle body 2 is closed in a conical shape, and this tip 2A! , :II! Several nozzle holes 10 are formed radially. Further, the tip end 9 of the needle valve 1 is also formed in a conical shape, and the nozzle hole 1
0 is wg-chained by the tip 9 coming into contact with the inside of the tip 2A of the nozzle body 2.
針弁１の摺接部６と７の間の小径部１１とノズルボディ
２との間には油溜り１２が形成され、この油溜り１２に
図示されない燃料ポンプから導かれた高圧燃料の通路１
３が接続する。An oil reservoir 12 is formed between the small diameter portion 11 between the sliding contact portions 6 and 7 of the needle valve 1 and the nozzle body 2, and a passage 1 for high-pressure fuel led from a fuel pump (not shown) is formed in the oil reservoir 12.
3 connects.
針弁１の摺接部７と８の間及び摺接部８と先端部９の間
の各小径部１４と１５は小径部１１と同径に形成され、
小径部１４と／グルボディ２の間の環状隙間１６にノズ
ルボディ２に形成した通路１７が接続する。The small diameter portions 14 and 15 between the sliding contact portions 7 and 8 and between the sliding contact portion 8 and the tip portion 9 of the needle valve 1 are formed to have the same diameter as the small diameter portion 11,
A passage 17 formed in the nozzle body 2 connects to an annular gap 16 between the small diameter portion 14 and the glue body 2 .
また、小径部１５とノズルボディ２の間に先端部油溜り
１８が形成され、この先端部油溜り１８と油溜り１２が
針弁１の内情に斜め方向に形成した４本の通孔１９を介
して連通する。Further, a tip oil reservoir 18 is formed between the small diameter portion 15 and the nozzle body 2, and the tip oil reservoir 18 and the oil reservoir 12 form four through holes 19 formed diagonally inside the needle valve 1. communicate through.
さらに、摺接部８の外周にはガイド５に臨む四部２０が
等しい角度間隔で４箇所に形成され、第２図に示すよう
に各凹部２０と各通孔１９とがオリフィス２１を介して
連通する。Furthermore, four parts 20 facing the guide 5 are formed at equal angular intervals on the outer periphery of the sliding contact part 8, and each recess 20 and each through hole 19 communicate with each other via an orifice 21, as shown in FIG. do.
針弁１の基層は第１のスプリング２２にロッド状に形成
されたばね受け２３と押圧部材２５とを介して支持され
る。また、押圧部材２５から距離ｌをおいて第２のスプ
リング２４がばね受け２３の外側に配置され、第１のス
プリングが卸離ｌだけ収縮すると、第２のスプリング２
４がばね受け２６を介して押圧部材２５に当接し、第１
のスプリング２２とともに針弁１を弾性支持する。なお
、第２のスプリング２４を収装するばね室２７は低圧に
保持され、前記環状隙間１６に連通する通路１７がこの
ばね室２７に接続される。The base layer of the needle valve 1 is supported by the first spring 22 via a rod-shaped spring receiver 23 and a pressing member 25 . Further, the second spring 24 is placed outside the spring receiver 23 at a distance l from the pressing member 25, and when the first spring contracts by the distance l, the second spring 24
4 comes into contact with the pressing member 25 via the spring receiver 26, and the first
The needle valve 1 is elastically supported together with the spring 22. Note that a spring chamber 27 housing the second spring 24 is maintained at a low pressure, and a passage 17 communicating with the annular gap 16 is connected to this spring chamber 27 .
次に作用を説明する。Next, the action will be explained.
燃料圧力が作用しない状態では針弁１は第１図に示すよ
うに第１のスプリング２２に付勢されて噴孔１０を閉ざ
している。When no fuel pressure is applied, the needle valve 1 is biased by the first spring 22 to close the nozzle hole 10, as shown in FIG.
図示されない燃料ポンプから通路１３に高圧燃料が供給
されると、この燃料は通路１３から油溜り１２と通孔１
９を経て先端部油溜り１８に流入する。When high-pressure fuel is supplied to the passage 13 from a fuel pump (not shown), this fuel is transferred from the passage 13 to the oil sump 12 and the through hole 1.
9 and flows into the tip oil reservoir 18.
この燃料の圧力は摺接部８と小径部１５の間の段差に上
向らに作用し、針弁１を第１のスプリング２２に抗して
上方へ変位させる。これにより、噴孔１０が先端部油溜
り１８に連通し、噴孔１０から燃料が外側の燃焼室へと
噴射される。なお、摺接部６及び７と小径部１１との各
段差に働く圧力は等しく、また摺接部７及び８と小径部
１４との各段差に働く圧力も等しい、したがって、これ
らの圧力が針弁１を駆動することはな仁針弁１は摺接部
８と小径部１５の段差に働く燃料圧力に応じて変位する
。The pressure of this fuel acts upward on the step between the sliding contact portion 8 and the small diameter portion 15, displacing the needle valve 1 upward against the first spring 22. As a result, the nozzle hole 10 communicates with the tip oil reservoir 18, and fuel is injected from the nozzle hole 10 into the outer combustion chamber. Note that the pressure acting on each level difference between the sliding contact parts 6 and 7 and the small diameter part 11 is equal, and the pressure acting on each level difference between the sliding contact parts 7 and 8 and the small diameter part 14 is also equal. The needle valve 1, which does not drive the valve 1, is displaced in accordance with the fuel pressure acting on the step between the sliding portion 8 and the small diameter portion 15.
ところで、針弁１に作用する燃料圧力と第１のスプリン
グ２２の反発力の各作用位置が離れているため、これら
の力が正確に同軸上で逆向きに作用しないと、針弁１に
偏心力が作用する。By the way, since the positions where the fuel pressure acting on the needle valve 1 and the repulsive force of the first spring 22 act are far apart, if these forces do not act on the same axis and in opposite directions, the needle valve 1 will be eccentric. Force acts.
しかし、摺接部８の凹部２０には通孔１９及びオリフィ
ス２１を介して高圧の燃料圧力が作用しており、針弁１
が偏心して摺接部８の一部とガイド５の隙間が大きくな
ると、この隙間に連通する四部２０の燃料が隙間から上
方の低圧の環状隙間１６へと大量に流出し、凹部２０の
圧力が低下して反対側の四部２０との間に圧力差を生じ
る。この圧力差は針弁１に対して偏心方向と逆向きに作
用し、針弁１を中心位置へ戻す力として働くので、針弁
１の偏心は直ちに修正される。However, high fuel pressure acts on the recess 20 of the sliding contact portion 8 through the through hole 19 and the orifice 21, and the needle valve 1
When the gap between a part of the sliding contact part 8 and the guide 5 increases due to eccentricity, a large amount of fuel in the four parts 20 communicating with this gap flows out from the gap to the low-pressure annular gap 16 above, and the pressure in the recess 20 increases. This causes a pressure difference between the four parts 20 on the opposite side. This pressure difference acts on the needle valve 1 in the opposite direction to the eccentric direction and acts as a force to return the needle valve 1 to the center position, so that the eccentricity of the needle valve 1 is immediately corrected.
したがって、針弁１は燃料圧力の変化に対応して常にス
ムーズに摺動し、燃料圧力が低下すると応答良く噴孔１
０を閉鎖するので、噴射末期に燃料がうまく微粒化しな
かったり、燃料が噴孔１０周囲に付着することがない、
また、針弁１が偏心しにくいことから、各噴孔１０から
噴射される燃料の噴霧も均一化される。このようにして
燃焼室には必要に応じて燃料が過不足なく好ましい状態
で供給されるので、燃焼室はスモークやＨＣの発生しに
くい燃焼環境となる。Therefore, the needle valve 1 always slides smoothly in response to changes in fuel pressure, and when the fuel pressure decreases, the nozzle valve 1 responds smoothly.
0 is closed, so the fuel does not atomize properly at the end of injection and the fuel does not adhere around the nozzle hole 10.
Furthermore, since the needle valve 1 is less likely to be eccentric, the spray of fuel injected from each nozzle hole 10 is also made uniform. In this way, fuel is supplied to the combustion chamber in a desirable manner, with just enough fuel as needed, so that the combustion chamber becomes a combustion environment in which smoke and HC are less likely to occur.
第３図及び第４図は本発明の第２の実施例を示す。ここ
では、ガイド４と摺接部７を設けず、ガイド３と５及び
摺接部６と８のみを設けている。3 and 4 show a second embodiment of the invention. Here, the guide 4 and the sliding contact portion 7 are not provided, and only the guides 3 and 5 and the sliding contact portions 6 and 8 are provided.
また、摺接部８の外周に形成した４箇所の凹部２０に針
弁１の内側に交錯的に配置した４本の通孔１９を各々接
続し、これらの通孔１９を針弁１の中心線をはさんで四
部２０と反対側に位置する先端部２Ａの外周に開口する
。In addition, four through holes 19 arranged in an intersecting manner inside the needle valve 1 are connected to the four recesses 20 formed on the outer periphery of the sliding contact portion 8, and these through holes 19 are connected to the center of the needle valve 1. It opens at the outer periphery of the tip portion 2A located on the opposite side of the four portions 20 across the line.
この場合には高圧燃料は通路１３から油溜り１２及び溝
３０を介して先端部油溜り１８に導かれ、針弁１の先端
部９とノズルボディ２の先端部２Ａの隙間を介して噴孔
１０からノズルボディ２の外側の燃焼室へ噴出する。In this case, high-pressure fuel is guided from the passage 13 through the oil sump 12 and the groove 30 to the tip oil sump 18, and passes through the nozzle hole through the gap between the tip 9 of the needle valve 1 and the tip 2A of the nozzle body 2. 10 to the combustion chamber outside the nozzle body 2.
その場合に、針弁１が偏心すると、先端ｓ２Ａと９の一
部の隙間が広がり、その隙間に先端部油溜り１８の高圧
燃料が大量に供給される。このため、この隙間に通孔１
９を介して連通する凹部１２は高圧となるが、この隙間
の反対側では先端部２Ａと９の間に隙間がなく、この部
分に通孔１９を介して連通する四部１２は相対的に低圧
となる。In this case, when the needle valve 1 is eccentric, a part of the gap between the tips s2A and 9 widens, and a large amount of high-pressure fuel in the tip oil reservoir 18 is supplied to the gap. For this reason, there is a through hole in this gap.
The concave portion 12 that communicates with this portion through the hole 9 is under high pressure, but on the opposite side of this gap there is no gap between the tips 2A and 9, and the four portions 12 that communicate with this portion through the through hole 19 are under relatively low pressure. becomes.
通孔１９が針弁１の中心線を越えて交錯的に配置されて
いるため、この圧力差は針弁１に対して偏心方向と逆向
きに作用し、針弁１を中心方向に戻す作用をもたらす。Since the through holes 19 are arranged in an intersecting manner beyond the center line of the needle valve 1, this pressure difference acts on the needle valve 1 in the opposite direction to the eccentric direction, and causes the needle valve 1 to return toward the center. bring about.
したがって、この実施例によれば第１の実施例に比べて
簡易な構成で針弁１の偏心を防止し、好ましい燃焼環境
を維持することがで外る。Therefore, according to this embodiment, eccentricity of the needle valve 1 can be prevented with a simpler structure than in the first embodiment, and a preferable combustion environment can be maintained.
（発明の効果）
以上のように、本発明は針弁のガイドとの摺接部に等し
い角度間隔で複数の四部を形成し、各凹部に高圧燃料を
導く通路を備えたので、凹部に導かれた燃料が静圧軸受
を構成し、針弁の偏心を抑制して燃料の噴射を均一にで
き、燃焼室内への燃料分散に過不足がなくなる作用をも
たらす。(Effects of the Invention) As described above, the present invention forms a plurality of four parts at equal angular intervals at the sliding contact part of the needle valve with the guide, and each recess is provided with a passage for guiding high-pressure fuel. The discharged fuel forms a static pressure bearing, which suppresses the eccentricity of the needle valve and makes fuel injection uniform, resulting in the effect that there is no excess or deficiency in fuel distribution within the combustion chamber.
このため、特に窒素酸化物の低減をａ的とした２段噴射
ノズルのような、針弁り７Ｆ量が小さく、針弁の偏心に
よる燃料の不均一分散期間が長くなるノズルにおいても
燃料の過不足によるスモークや単価水素のキ≠≠発生を
大幅に低減する効果がある。Therefore, even in nozzles such as two-stage injection nozzles whose purpose is to reduce nitrogen oxides, where the needle valve depth 7F is small and the uneven distribution period of fuel due to eccentricity of the needle valve is long, there is no excess fuel. It has the effect of significantly reducing the occurrence of smoke and unit price hydrogen due to shortages.
第１図は本発明の第１の実施例を示す燃料噴射ノズルの
縦断面図、第２図は同じく針弁摺接部の横断面図、ＩＩ
Ｐｉ３図は第２の実施例を示す燃料噴射／にルの縦断面
図、第４図は同じく針弁摺接部の横断面図である。
また、第５図は従来例を示す燃料噴射ノズルの縦断面図
である。
１・・・針弁、２・・・／ズルボデイ、３ ＝ ４ ｔ
５・・・がイド、６，７，８・・・摺接部、１０・・
・噴孔、１２・・・油溜り、１３・・・通路、１８・・
・先端部油溜り、１９・・・通孔、２０・・・凹部、２
１・・・オリフィス、２２・・・第１のスプリング、２
−ｔ−・・・第２のスプリング。FIG. 1 is a longitudinal cross-sectional view of a fuel injection nozzle showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the needle valve sliding contact portion, II
Figure Pi3 is a longitudinal cross-sectional view of the fuel injection valve showing the second embodiment, and Figure 4 is a cross-sectional view of the sliding contact portion of the needle valve. Moreover, FIG. 5 is a longitudinal cross-sectional view of a fuel injection nozzle showing a conventional example. 1... Needle valve, 2.../Zur body, 3 = 4 t
5... is the ID, 6, 7, 8... Sliding contact part, 10...
・Nozzle hole, 12... Oil reservoir, 13... Passage, 18...
・Tip oil reservoir, 19...through hole, 20...recess, 2
1... Orifice, 22... First spring, 2
-t-...Second spring.
Claims (1)
噴射する噴孔を放射状に形成し、これらの噴孔を軸方向
位置に応じて開閉する針弁をノズルボディの内側に形成
したガイドで摺動自由に支持し、ノズルボディと針弁の
間を通っで噴孔に導かれる高圧燃料に接して針弁を基端
方向へ付勢する受圧部を針弁に形成する一方、針弁を先
端方向へ付勢するスプリングを備えた燃料噴射ノズルに
おいて、前記ガイドに摺接する針弁の摺接部にガイドに
臨んで等しい角度間隔で複数の凹部を形成し、各凹部に
高圧燃料を導く通路を針弁の内部に形成したことを特徴
とする燃料噴射ノズル。This guide has nozzle holes for injecting fuel radially formed at the tip of a cylindrical nozzle body with a sealed tip, and needle valves are formed inside the nozzle body to open and close these nozzle holes depending on the axial position. The needle valve is formed with a pressure-receiving part that is freely slidably supported and urges the needle valve toward the proximal end by contacting the high-pressure fuel that passes between the nozzle body and the needle valve and is guided to the nozzle hole. In a fuel injection nozzle equipped with a spring that biases toward the tip, a plurality of recesses facing the guide are formed at equal angular intervals in the sliding contact portion of the needle valve that is in sliding contact with the guide, and a passage guides high-pressure fuel to each recess. A fuel injection nozzle characterized in that a needle valve is formed inside the needle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2267238A JP2953017B2 (en) | 1990-10-04 | 1990-10-04 | Fuel injection nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2267238A JP2953017B2 (en) | 1990-10-04 | 1990-10-04 | Fuel injection nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04143455A true JPH04143455A (en) | 1992-05-18 |
| JP2953017B2 JP2953017B2 (en) | 1999-09-27 |
Family
ID=17442057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2267238A Expired - Lifetime JP2953017B2 (en) | 1990-10-04 | 1990-10-04 | Fuel injection nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2953017B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335000A (en) * | 1998-03-05 | 1999-09-08 | Lucas Ind Plc | Fuel injector having a restricted fuel flow path provided by a needle valve |
| EP2110541A1 (en) * | 2008-04-18 | 2009-10-21 | MAGNETI MARELLI POWERTRAIN S.p.A. | Fuel injector with direct shutter actuation for internal combustion engines |
| CN108533432A (en) * | 2018-01-23 | 2018-09-14 | 中国第汽车股份有限公司 | A kind of atomizer improving each hole oil spout uniformity |
-
1990
- 1990-10-04 JP JP2267238A patent/JP2953017B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2335000A (en) * | 1998-03-05 | 1999-09-08 | Lucas Ind Plc | Fuel injector having a restricted fuel flow path provided by a needle valve |
| EP2110541A1 (en) * | 2008-04-18 | 2009-10-21 | MAGNETI MARELLI POWERTRAIN S.p.A. | Fuel injector with direct shutter actuation for internal combustion engines |
| US8061632B2 (en) | 2008-04-18 | 2011-11-22 | MAGNETI MARELLI S.p.A. | Fuel injector with direct shutter actuation for internal combustion engines |
| CN108533432A (en) * | 2018-01-23 | 2018-09-14 | 中国第汽车股份有限公司 | A kind of atomizer improving each hole oil spout uniformity |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2953017B2 (en) | 1999-09-27 |
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