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JP2584728B2 - Fuel injection nozzle - Google Patents

Fuel injection nozzle

Info

Publication number
JP2584728B2
JP2584728B2 JP62248078A JP24807887A JP2584728B2 JP 2584728 B2 JP2584728 B2 JP 2584728B2 JP 62248078 A JP62248078 A JP 62248078A JP 24807887 A JP24807887 A JP 24807887A JP 2584728 B2 JP2584728 B2 JP 2584728B2
Authority
JP
Japan
Prior art keywords
fuel injection
valve
valve seat
fuel
injection hole
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.)
Expired - Lifetime
Application number
JP62248078A
Other languages
Japanese (ja)
Other versions
JPH0192569A (en
Inventor
正憲 大西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP62248078A priority Critical patent/JP2584728B2/en
Publication of JPH0192569A publication Critical patent/JPH0192569A/en
Application granted granted Critical
Publication of JP2584728B2 publication Critical patent/JP2584728B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806Injection 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
    • F02M61/182Discharge orifices being situated in different transversal planes with respect to valve member direction of movement

Landscapes

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

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、燃料噴射孔をノズル本体の弁座に開口さ
せた燃料噴射ノズルに関する。
Description: TECHNICAL FIELD The present invention relates to a fuel injection nozzle having a fuel injection hole opened in a valve seat of a nozzle body.

[従来の技術] 従来のこの種の燃料噴射ノズルとしては、第3図に示
すものがある。この燃料噴射ノズルは、ノズル本体1の
内部にその後端側から先端側へ向かって、弁収納孔11、
燃料溜まり室12およびテーパ状をなす弁座13を順次形成
するとともに、弁座13に開口する複数の燃料噴射孔14を
形成する一方、弁収納孔11に針弁(弁体)2を摺動自在
に挿入し、この針弁2の先端部に弁座13に対して着座・
離間することにより燃料噴射孔14を開閉する弁部21を形
成したものであり、エンジンの燃焼室(図示せず)にお
ける燃焼状態が最良となる噴霧分布を得るために、弁座
13の軸線、つまりノズル本体1の軸線に対する各燃料噴
射孔14の角度(以下、この角度を噴射角度という。)を
互いに異なる角度とし、またノズル本体1の軸線方向に
おける各燃料噴射孔14の開口位置を同一位置に設定して
いる。
[Prior Art] FIG. 3 shows a conventional fuel injection nozzle of this type. The fuel injection nozzle has a valve housing hole 11 inside the nozzle body 1 from the rear end side to the front end side.
A fuel reservoir chamber 12 and a tapered valve seat 13 are sequentially formed, and a plurality of fuel injection holes 14 opening in the valve seat 13 are formed, while a needle valve (valve element) 2 slides in the valve storage hole 11. The needle valve 2 is inserted freely and seated against the valve seat 13 at the tip of the needle valve 2.
A valve portion 21 that opens and closes the fuel injection hole 14 by being separated is formed. In order to obtain a spray distribution in which a combustion state in a combustion chamber (not shown) of the engine is optimized, a valve seat 21 is provided.
The angles of the fuel injection holes 14 with respect to the 13 axis, that is, the axis of the nozzle body 1 (hereinafter referred to as the injection angle) are different from each other, and the opening of each fuel injection hole 14 in the axial direction of the nozzle body 1 is set. The position is set to the same position.

上記の燃料噴射ノズルにおいては、燃料噴射ポンプ
(図示せず)から通路15を介して燃料溜まり室12内へ燃
料が圧送されてくると、燃料の圧力によって弁体2がリ
フトする。すると、燃料溜まり室12内の燃料が弁座13と
弁部21との間を通って流れ、各燃料噴射孔14内に流入す
る。このとき、弁座13に対する各燃料噴射孔14の傾斜角
度が互いに異なっているため、換言すれば燃料の流れに
対して各燃料噴射孔14の傾斜角度が互いに異なっている
ため、燃料の流入し易さが各燃料噴射孔14毎に相違す
る。例えば、図3において右側の燃料噴射孔14には燃料
が流入し易く、左側の燃料噴射孔14には燃料が流入しに
くい。このため、各燃料噴射孔14内に流入する燃料の流
入量に差異が生じ、各燃料噴射孔14から噴射される噴射
量が不均一になる。この結果、比較的多量のスモークが
発生するという問題があった。
In the above-described fuel injection nozzle, when fuel is pressure-fed from a fuel injection pump (not shown) into the fuel storage chamber 12 via the passage 15, the valve body 2 is lifted by the pressure of the fuel. Then, the fuel in the fuel storage chamber 12 flows between the valve seat 13 and the valve portion 21 and flows into each fuel injection hole 14. At this time, the inclination angles of the fuel injection holes 14 with respect to the valve seat 13 are different from each other. The ease is different for each fuel injection hole 14. For example, in FIG. 3, the fuel easily flows into the right fuel injection hole 14 and the fuel hardly flows into the left fuel injection hole 14. For this reason, a difference occurs in the amount of fuel flowing into each fuel injection hole 14, and the amount of fuel injected from each fuel injection hole 14 becomes uneven. As a result, there is a problem that a relatively large amount of smoke is generated.

このようなスモークの減少を図った燃料噴射ノズルと
して、実開昭59−154860号公報に記載のものがある。こ
の公報に記載の燃料噴射ノズルは、第4図に示すよう
に、弁座13における各燃料噴射孔14の開口部に凹部16を
それぞれ形成したものである。この燃料噴射ノズルにお
いては、燃料が凹部16内に滞留するので、噴射角度の差
異に基づく各燃料噴射供孔14内への流入量のバラツキを
抑えることができ、ひいては各燃料噴射孔14からの噴射
量の均一性を向上させることができる。したがって、発
生するスモークを減少させることができる。
Japanese Unexamined Utility Model Publication No. 59-154860 discloses a fuel injection nozzle which reduces such smoke. As shown in FIG. 4, the fuel injection nozzle described in this publication has a recess 16 formed in the opening of each fuel injection hole 14 in the valve seat 13. In this fuel injection nozzle, the fuel stays in the recess 16, so that it is possible to suppress the variation in the amount of inflow into each fuel injection hole 14 due to the difference in the injection angle, and, consequently, from the fuel injection hole 14. The uniformity of the injection amount can be improved. Therefore, the generated smoke can be reduced.

[発明が解決しようとする問題点] しかしながら、上記の燃料噴射ノズルおにいては、弁
座13がノズル本体1の内部に、それも奥深くに形成され
ているため、凹部16の形成作業が困難であり、生産性の
低下を余儀なくされるという問題があった。
[Problems to be Solved by the Invention] However, in the above-described fuel injection nozzle, since the valve seat 13 is formed deep inside the nozzle body 1, it is difficult to form the recess 16. However, there has been a problem that productivity has to be reduced.

[発明の目的] この発明は、上記問題を解決するためになされたもの
で、各燃料噴射孔からの噴射量のバラツキを軽減してス
モークを減少させることができるのは勿論のこと、生産
性を大幅に向上させることができる燃料噴射ノズルを提
供することを目的とする。
[Purpose of the Invention] The present invention has been made to solve the above-mentioned problem, and it is possible to reduce the variation in the injection amount from each fuel injection hole to reduce the smoke, as well as the productivity. It is an object of the present invention to provide a fuel injection nozzle capable of greatly improving the fuel injection nozzle.

[発明の構成] この発明は、上記の目的を達成するために、弁体の最
大リフト量をL1とし、各燃料噴射孔の弁座における開口
部の下端縁から着座時における弁部の下端縁までの距離
をL2としたとき、L1>L2に設定したことを構成上の主特
徴とするものである。
The present invention Configuration of the Invention] In order to achieve the above object, the maximum lift amount of the valve body and L 1, the lower end of the valve portion at the time of sitting from the lower edge of the opening in the valve seat of the fuel injection holes when the distance to the edge and the L 2, in which a main feature in the construction that has been set to L 1> L 2.

[作用] 弁体2の最大リフト量がL1で、弁体2の着座時におけ
る弁部21と下端縁Bから燃料噴射孔14の下端縁Aまでの
距離がL2であるから、弁体2の最大リフト時には、各燃
料噴射孔14の弁座13における開口部のうち(L1−L2)で
規定される部分が下端縁Bより下側に位置し、弁座孔17
の内部空間のうちの下端縁Bより下側の部分に面するこ
とになる。ここで、弁座孔17の内部空間のうちの下端縁
Bより下側の部分は、弁体の着座時は勿論のこと、リフ
ト時においても燃料がほとんど流れずに滞留している。
このように、各燃料噴射孔14のうちの(L1−L2)で規定
される部分が燃料の流れのない滞留部分に面することに
なるので、(L1−L2)の部分では燃料の流入のし易さが
各燃料噴射孔14の傾斜角度に拘わらず同程度になり、当
該部分にほぼ一定の燃料が流入する。よって、各燃料噴
射孔14から噴射される燃料噴射量のバラツキを軽減する
ことができる。
The maximum lift amount of [Operation] valve body 2 is L 1, since the distance from the valve unit 21 and the lower edge B at the time of sitting the valve body 2 to the lower edge A of the fuel injection hole 14 is L 2, the valve body 2, the portion defined by (L 1 −L 2 ) of the opening of the fuel injection hole 14 in the valve seat 13 is located below the lower edge B, and the valve seat hole 17
Of the inner space below the lower end edge B. Here, in the portion of the internal space of the valve seat hole 17 below the lower end edge B, the fuel stays with little flow even during the lift as well as when the valve body is seated.
As described above, since the portion of each fuel injection hole 14 defined by (L 1 −L 2 ) faces the stagnant portion where there is no fuel flow, the (L 1 −L 2 ) portion The ease of fuel inflow is almost the same irrespective of the angle of inclination of each fuel injection hole 14, and almost constant fuel flows into this portion. Therefore, it is possible to reduce the variation in the fuel injection amount injected from each fuel injection hole 14.

[実施例] 以下、この発明の一実施例について、第1図および第
2図を参照して説明する。なお、第1図は弁体の最大リ
フト状態を示す図であり、第2図は弁部が弁座に着座し
た閉弁時の状態を示す図である。また、第1図および第
2図において上記従来例と同様な部分には同一符号を付
してある。
Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a view showing a maximum lift state of the valve body, and FIG. 2 is a view showing a state at the time of valve closing in which a valve portion is seated on a valve seat. In FIGS. 1 and 2, the same parts as those in the conventional example are denoted by the same reference numerals.

第1図に示すように、この発明の燃料噴射ノズルにお
いては、弁体2の最大リフト量がL1に設定されている。
一方、弁部21が弁座13に着座した閉弁時においては、第
2図に示すように、弁体2のリフトダウン方向における
下端縁Bが各燃料噴射孔14の同方向における下端縁Aよ
り先方に位置しており、それらA,B間の距離がL2に設定
されている。そして、これらL1とL2とは、L1>L2に設定
されている。
As shown in FIG. 1, a fuel injection nozzle of this invention, the maximum lift of the valve body 2 is set to L 1.
On the other hand, when the valve portion 21 is seated on the valve seat 13, as shown in FIG. 2, the lower edge B of the valve body 2 in the lift-down direction is the lower edge A of each fuel injection hole 14 in the same direction. more located in other party, they a, the distance between the B is set to L 2. Then, these L 1 and L 2, are set to L 1> L 2.

このように、L1>L2に設定されているから、弁体2が
最大リフト位置までリフトすると、各燃料噴射孔14の弁
座13における開口部のうち、(L1−L2)で規定される部
分が下端縁Bより下側に位置し、弁座孔17の内部空間の
うちの下端縁Bより下側の部分に面することになる。こ
こで、弁座孔17の内部空間のうちの下端縁Bより下側の
部分は、弁体の着座時は勿論のこと、リフト時において
も燃料がほとんど流れずに滞留している。各燃料噴射孔
14のうちの(L1−L2)で規定される部分が燃料の流れの
ない滞留部分に面することになるので、(L1−L2)の部
分では燃料の流入のし易さが各燃料噴射孔14の傾斜角度
に拘わらず同程度になり、当該部分にはほぼ一定の燃料
が流入する。よって、各燃料噴射孔14から噴射される燃
料噴射量のバラツキを軽減することができる。
As described above, since L 1 > L 2 is set, when the valve body 2 is lifted to the maximum lift position, (L 1 −L 2 ) of the openings in the valve seat 13 of each fuel injection hole 14. The defined portion is located below the lower end edge B, and faces the portion below the lower end edge B in the internal space of the valve seat hole 17. Here, in the portion of the internal space of the valve seat hole 17 below the lower end edge B, the fuel stays with little flow even during the lift as well as when the valve body is seated. Each fuel injection hole
Since the portion defined by (L 1 -L 2 ) of 14 faces the stagnant portion where there is no fuel flow, the ease of fuel inflow is reduced at (L 1 -L 2 ). Regardless of the angle of inclination of each of the fuel injection holes 14, the fuel injection holes 14 are substantially the same, and almost constant fuel flows into the corresponding portions. Therefore, it is possible to reduce the variation in the fuel injection amount injected from each fuel injection hole 14.

このような点から明らかなように、各燃料噴射孔14か
らの燃料噴射量をより均一なものとするためには、弁体
2の最大リフト時に、下端縁Bを燃料噴射孔14よりもリ
フト方向先方に位置させることが望ましく、そのために
は各燃料噴射孔14の直径を等しくDとしたとき、L1−L2
≧Dとすればよい。ただし、閉弁時にサック部18および
弁座孔17内部の燃料が燃料噴射孔14から流出するのを防
止するために、L2≧0.05mmとするのが望ましい。
As is apparent from this point, in order to make the fuel injection amount from each fuel injection hole 14 more uniform, the lower end edge B is lifted more than the fuel injection hole 14 at the maximum lift of the valve body 2. It is desirable that the fuel injection holes 14 be located in the forward direction, and when the diameter of each fuel injection hole 14 is equal to D, L 1 −L 2
It is sufficient that ≧ D. However, in order to prevent the fuel inside the sack portion 18 and the valve seat hole 17 from flowing out from the fuel injection hole 14 when the valve is closed, it is preferable that L 2 ≧ 0.05 mm.

また、上記の燃料噴射ノズルにおいては、基本的形状
が前述した先の従来例と同様であり、実開昭59−154860
号公報に記載のもののような凹部を形成する必要全くな
い。したがって、容易に製造することができ、その生産
性を大幅に向上させることができる。
In the above fuel injection nozzle, the basic shape is the same as that of the above-mentioned conventional example.
There is no need to form a recess as in the publication. Therefore, it can be easily manufactured, and its productivity can be greatly improved.

なお、上記の実施例においては、弁部21の先端面にテ
ーパ角度の大きな突出部22を形成しているが、弁部21の
先端面を弁体2の軸線と直交する平面としてもよい。ま
たそのようにすることによって各燃料噴射孔14からの噴
射量をより一層均一なものとすることができる。
In the above-described embodiment, the protruding portion 22 having a large taper angle is formed on the distal end surface of the valve portion 21. However, the distal end surface of the valve portion 21 may be a plane orthogonal to the axis of the valve body 2. By doing so, the injection amount from each fuel injection hole 14 can be made more uniform.

[発明の効果] 以上説明したように、この発明の燃料噴射ノズルによ
れば、弁体の最大リフト量をL1とし、弁座に対して弁部
が着座した際に、リフトダウン方向における各燃料噴射
孔の開口部の下端縁から同方向における弁部の下端縁ま
での距離をL2としたとき、L1>L2に設定したものである
から、各燃料噴射孔からの噴射量のバラツキを軽減して
スモークを減少させることができるのは勿論のこと、生
産性が大幅に向上させることができる等の効果が得られ
る。
As it has been described [Effects of the Invention According to the fuel injection nozzle of the present invention, the maximum lift amount of the valve body and L 1, when the valve portion against the valve seat is seated, each in the lift-down direction when the distance from the bottom edge of the opening of the fuel injection hole to the lower edge of the valve portion in the same direction is L 2, since it is intended to set in L 1> L 2, the injection quantity from the fuel injection holes The effects of not only reducing the variation and reducing the smoke, but also significantly improving the productivity can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

第1図および第2図はこの発明の一実施例の要部を示す
もので、第1図は弁体の最大リフト状態を示す断面図、
第2図は閉弁状態を示す断面図、第3図は従来の燃料噴
射ノズルの一例の要部を示す断面図、第4図は従来の燃
料噴射ノズルの他の例の要部について、右半部で閉弁状
態を示し、左半部で最大リフト状態を示す断面図であ
る。 1……ノズル本体、2……針弁(弁体)、13……弁座、
14……燃料噴射孔、21……弁部、A,B……下端縁。
1 and 2 show the essential parts of one embodiment of the present invention. FIG. 1 is a sectional view showing a maximum lift state of a valve body.
FIG. 2 is a cross-sectional view showing a valve closed state, FIG. 3 is a cross-sectional view showing a main part of an example of a conventional fuel injection nozzle, and FIG. It is sectional drawing which shows a valve closing state in a half part, and shows a maximum lift state in a left half part. 1 ... nozzle body, 2 ... needle valve (valve element), 13 ... valve seat,
14 ... fuel injection hole, 21 ... valve part, A, B ... bottom edge.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】内部にテーパ状をなす弁座が形成されると
ともに、この弁座に開口する複数の燃料噴射孔が形成さ
れたノズル本体と、このノズル本体に摺動自在に設けら
れた弁体とを備え、前記弁体には、前記弁座に対応した
テーパ状をなし、前記弁座に対して着座・離間すること
によって前記燃料噴射孔を開閉する弁部が形成され、前
記各燃料噴射孔が前記弁座の軸線に対して互いに異なる
角度をもって傾斜し、かつ弁座における各燃料噴射孔の
開口部が弁座の軸線方向のほぼ同一位置に位置する燃料
噴射ノズルにおいて、前記弁体の最大リフト量をL1
し、各燃料噴射孔の弁座における開口部の下端縁から着
座時における弁部の下端縁までの距離をL2としたとき、
L1>L2に設定したことを特徴とする燃料噴射ノズル。
1. A nozzle body having a tapered valve seat formed therein, a plurality of fuel injection holes formed in the valve seat, and a valve slidably provided in the nozzle body. A valve portion that has a tapered shape corresponding to the valve seat and that opens and closes the fuel injection hole by being seated and separated from the valve seat. A fuel injection nozzle wherein the injection holes are inclined at different angles with respect to the axis of the valve seat, and the openings of the fuel injection holes in the valve seat are located at substantially the same position in the axial direction of the valve seat; maximum lift amount is L 1, and the distance from the lower edge of the opening in the valve seat of the fuel injection hole to the lower edge of the valve portion at the time of sitting was L 2 of,
A fuel injection nozzle characterized by setting L 1 > L 2 .
JP62248078A 1987-10-02 1987-10-02 Fuel injection nozzle Expired - Lifetime JP2584728B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62248078A JP2584728B2 (en) 1987-10-02 1987-10-02 Fuel injection nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62248078A JP2584728B2 (en) 1987-10-02 1987-10-02 Fuel injection nozzle

Publications (2)

Publication Number Publication Date
JPH0192569A JPH0192569A (en) 1989-04-11
JP2584728B2 true JP2584728B2 (en) 1997-02-26

Family

ID=17172882

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62248078A Expired - Lifetime JP2584728B2 (en) 1987-10-02 1987-10-02 Fuel injection nozzle

Country Status (1)

Country Link
JP (1) JP2584728B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE93583T1 (en) * 1989-08-17 1993-09-15 Steyr Daimler Puch Ag FUEL INJECTION NOZZLE FOR COMBUSTION ENGINES.
GB9012844D0 (en) * 1990-06-08 1990-08-01 Lucas Ind Plc Fuel injection nozzles
GB9012842D0 (en) * 1990-06-08 1990-08-01 Lucas Ind Plc Fuel injection nozzles
US5211340A (en) * 1991-08-27 1993-05-18 Zexel Corporation Fuel injector
JPH08312500A (en) * 1995-05-11 1996-11-26 Mitsubishi Motors Corp Fuel injection valve

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5340568Y2 (en) * 1973-09-17 1978-09-30
JPS5229531A (en) * 1975-09-01 1977-03-05 Diesel Kiki Co Ltd Haul nozzle
JPS5949774U (en) * 1982-09-28 1984-04-02 いすゞ自動車株式会社 fuel injection nozzle
JPS59154860U (en) * 1983-04-01 1984-10-17 株式会社ボッシュオートモーティブ システム Seat hole type fuel injection nozzle

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