JPH0565712B2 - - Google Patents

Info

Publication number
JPH0565712B2
JPH0565712B2 JP57023987A JP2398782A JPH0565712B2 JP H0565712 B2 JPH0565712 B2 JP H0565712B2 JP 57023987 A JP57023987 A JP 57023987A JP 2398782 A JP2398782 A JP 2398782A JP H0565712 B2 JPH0565712 B2 JP H0565712B2
Authority
JP
Japan
Prior art keywords
fuel
nozzle
combustion chamber
nozzle hole
fuel injection
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
JP57023987A
Other languages
Japanese (ja)
Other versions
JPS58143163A (en
Inventor
Hideo Kawamura
Hiroshi Matsuoka
Tetsuo Sugyama
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.)
Kyocera Corp
Isuzu Motors Ltd
Original Assignee
Kyocera Corp
Isuzu Motors 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 Kyocera Corp, Isuzu Motors Ltd filed Critical Kyocera Corp
Priority to JP2398782A priority Critical patent/JPS58143163A/en
Publication of JPS58143163A publication Critical patent/JPS58143163A/en
Publication of JPH0565712B2 publication Critical patent/JPH0565712B2/ja
Granted legal-status Critical Current

Links

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
    • F02M61/16—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
    • F02M61/184—Discharge orifices having non circular sections

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】 本発明は直接噴射式（以下、単に直噴式とい
う）デイーゼルエンジンに装着され、燃料をピス
トンの頂部に設けられた凹状燃料室に噴射する燃
料噴射ノズルの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a fuel injection nozzle that is installed in a direct injection type (hereinafter simply referred to as direct injection type) diesel engine and injects fuel into a concave fuel chamber provided at the top of a piston. be.

第１図は、従来の直噴式デイーゼルエンジンに
装着される燃料噴射ノズル１の構造を示す一部破
断による側面図であり、前記燃料噴射ノズルはそ
のノズルナツト９をもつて２点鎖線で示すデイー
ゼルエンジンのシリンダヘツド２に先端部３が燃
焼室４に臨むように装着されていて、噴射燃料ｆ
を前記燃焼室４に噴射するように構成されてい
る。 FIG. 1 is a partially cutaway side view showing the structure of a fuel injection nozzle 1 installed in a conventional direct-injection diesel engine. It is attached to the cylinder head 2 of the cylinder head 2 so that the tip 3 faces the combustion chamber 4, and the injected fuel f
is configured to inject into the combustion chamber 4.

ノズル１の先端部３に設けられた噴孔７は通常
第２図に示すように断面形状が円形であつて、こ
れより噴射される燃料は円錐状であるので、噴孔
７より燃焼室４に噴射された燃焼噴霧ｆは空気と
の接触面積が小さいためにその中心が濃く、外周
部が薄くなり、燃焼室４内の空気流との均一化さ
れた混合が得られず、円滑な燃焼が得られていな
いという欠点があつた。 The nozzle hole 7 provided at the tip 3 of the nozzle 1 usually has a circular cross-section as shown in FIG. 2, and the fuel injected from the nozzle hole 7 has a conical shape. The combustion spray f injected into the combustion chamber 4 has a small contact area with the air, so it is dense at the center and thin at the outer periphery, making it impossible to achieve homogeneous mixing with the air flow inside the combustion chamber 4, resulting in smooth combustion. The disadvantage was that it was not possible to obtain

この欠点を解消するために直線状のスリツトを
構成し、燃料噴霧を板状に噴射して空気との接触
面積を大きくするように構成したノズルが提案さ
れている。 In order to overcome this drawback, a nozzle has been proposed in which a linear slit is formed and the fuel spray is injected in a plate shape to increase the contact area with air.

ところで、直噴式デイーゼルエンジンのように
極く短時間に燃焼を完結させる必要がある場合に
は燃料の自由噴流だけでは空気との混合が充分得
られない。そのため、燃焼室内で吸気によるスワ
ールを発生させ、該スワールに燃料を吹き付けて
急速に混合させていることは周知である。したが
つて、前記の直線状スリツトから噴射される厚み
のない燃料噴霧は腰が弱くてスワールによつて中
央部で分断され易く、この分断された個所は燃焼
が遅れ、燃焼効率が悪化する欠点があつた。 By the way, when it is necessary to complete combustion in an extremely short period of time, such as in a direct injection diesel engine, sufficient mixing with air cannot be achieved with only a free jet of fuel. Therefore, it is well known that a swirl is generated by intake air in a combustion chamber, and fuel is sprayed onto the swirl to rapidly mix the fuel. Therefore, the thin fuel spray injected from the linear slit is weak and tends to be divided in the center by the swirl, which has the disadvantage of slowing combustion and deteriorating combustion efficiency. It was hot.

また、噴孔を直線的なスリツトに形成したノズ
ルの場合には、必要な燃焼噴霧量を得るためにス
リツトを長くしなければならず、余りこのスリツ
トが長くなるとノズル先端部の強度が低下すると
共に、噴孔の配置上スペース的に制約を受けると
いう欠点があつた。 In addition, in the case of a nozzle with a straight slit in the nozzle hole, the slit must be made long to obtain the required amount of combustion spray, and if the slit becomes too long, the strength of the nozzle tip will decrease. At the same time, there was a drawback that space was restricted due to the arrangement of the nozzle holes.

本発明は、前記のように丸孔あるいは直線的な
スリツト状である噴孔を有する燃料噴射ノズルの
欠点を解消して燃料と空気との混合を良好にし、
燃焼効率を向上させることのできる燃料噴射ノズ
ルを提供するものである。 The present invention solves the drawbacks of the fuel injection nozzle having a round hole or a straight slit injection hole as described above, improves the mixing of fuel and air,
The present invention provides a fuel injection nozzle that can improve combustion efficiency.

前記目的を達成するための本発明の構成は、ピ
ストンの頂部に凹状燃焼室を設けてなる直噴式デ
イーゼルエンジンの前記燃焼室に燃料を噴射する
燃料噴射ノズルの噴孔部に、前記燃焼室の開口縁
近傍に向けて燃料を噴射する上部の２辺と前記燃
焼室の底部に向けて燃料を噴射する下部の２辺と
を有するＸ字状スリツトからなる噴孔を形成した
ことを特徴とする直噴式デイーゼルエンジン用燃
料噴射ノズルにある。 The structure of the present invention for achieving the above object is such that a direct injection diesel engine having a concave combustion chamber provided at the top of a piston has a fuel injection nozzle that injects fuel into the combustion chamber. The injection hole is formed with an X-shaped slit having two upper sides that inject fuel toward the vicinity of the opening edge and two lower sides that inject fuel toward the bottom of the combustion chamber. Found in fuel injection nozzles for direct injection diesel engines.

以下、図面を参照して本発明の直噴式デイーゼ
ルエンジン用燃料噴射ノズルの実施例を説明す
る。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the fuel injection nozzle for a direct injection diesel engine of the present invention will be described below with reference to the drawings.

第３図は本発明による直噴式デイーゼルエンジ
ン用燃料噴射ノズルの実施例を示す一部破断断面
図、第４図は同実施例における燃料噴射ノズルの
先端部の拡大断面図、また第４図Ａは燃料噴射ノ
ズルの先端部に設けた噴孔の拡大正面図である。 FIG. 3 is a partially cutaway sectional view showing an embodiment of the fuel injection nozzle for a direct injection diesel engine according to the present invention, FIG. 4 is an enlarged sectional view of the tip of the fuel injection nozzle in the same embodiment, and FIG. FIG. 2 is an enlarged front view of a nozzle hole provided at the tip of the fuel injection nozzle.

本発明の好ましい実施例においては燃料噴射ノ
ズル１０の弁本体６の先端部の噴孔部６０をセラ
ミツク材により構成すると共に、その外周部に形
成したキー溝６１にキー６２を挿入して弁本体６
と噴孔部６０との間の位置決めを行なつた後に、
噴孔部６０の下方よりノズルナツト９を嵌合し、
そのねじ部９１を弁本体６のねじ部６３に螺合
し、更に、第３図に示すように２点鎖線で示す直
噴式デイーゼルエンジンのシリンダヘツド２に、
前記噴孔部６０がピストンの頂部に設けられた凹
状燃焼室４内に臨むように装着されている。 In a preferred embodiment of the present invention, the nozzle hole 60 at the tip of the valve body 6 of the fuel injection nozzle 10 is made of ceramic material, and a key 62 is inserted into a keyway 61 formed on the outer periphery of the valve body. 6
After positioning between the and the nozzle hole section 60,
Fit the nozzle nut 9 from below the nozzle hole part 60,
The threaded portion 91 is screwed into the threaded portion 63 of the valve body 6, and further, as shown in FIG.
The nozzle hole section 60 is mounted so as to face the inside of the concave combustion chamber 4 provided at the top of the piston.

本発明において重要な点は、燃料噴射ノズル１
０の噴孔部６０に設けた噴孔７０が、Ｘ字状スリ
ツトにより構成され、かつ上記Ｘ字状スリツトを
構成する４辺が燃焼室４の開口縁近傍に向けて燃
焼を噴射する上部の２辺と燃焼室４の底部に向け
て燃料を噴射する下部の２辺とからなり、互いに
一点で連結している点にある。 The important point in the present invention is that the fuel injection nozzle 1
The nozzle hole 70 provided in the nozzle hole section 60 of No. 0 is constituted by an X-shaped slit, and the four sides forming the X-shaped slit are located at the upper part where combustion is injected toward the vicinity of the opening edge of the combustion chamber 4. It consists of two sides and two lower sides where fuel is injected toward the bottom of the combustion chamber 4, and they are connected to each other at one point.

噴孔部６０に複雑な形状の噴孔７０を形成する
ことは金属では加工が困難であるが、加工性と耐
熱性が良好なセラミツク材によつて噴孔部６０を
構成すればこの問題は解決できる。 It is difficult to form a complicatedly shaped nozzle hole 70 in the nozzle hole section 60 with metal, but this problem can be solved if the nozzle hole section 60 is made of a ceramic material that has good workability and heat resistance. Solvable.

このセラミツク材としては、第１表にて掲げた
物性をもつた窒化珪素（Si3N4）焼結体や窒化珪
素に酸化アルミニウム（Al2O3）成分を含有せし
めたサイアロン焼結体が最適である。 Examples of this ceramic material include silicon nitride (Si 3 N 4 ) sintered bodies with the physical properties listed in Table 1 and sialon sintered bodies containing aluminum oxide (Al 2 O 3 ) components in silicon nitride. Optimal.

この第１表から明らかなように窒化珪素焼結体
は、高温強度において金属材料や従来のアルミナ
系セラミツクスに較べて数段優れた特性を持ち、
しかも熱シヨツクに対する極めて大きな耐熱衝撃
性を持つと共に、熱膨張係数が小さいこと、熱伝
導率が小さいなど燃料噴射ノズルの噴孔部の構成
には最適の材料である。 As is clear from Table 1, silicon nitride sintered bodies have properties that are much superior to metal materials and conventional alumina ceramics in terms of high-temperature strength.
Furthermore, it has extremely high thermal shock resistance, has a small coefficient of thermal expansion, and has low thermal conductivity, making it an optimal material for the construction of the injection hole portion of a fuel injection nozzle.

第４図Ａに噴孔７０を拡大してから示している
が、この噴孔７０は辺ａ、ｂ、ｃ、ｄからなる扁
平なスリツトをＸ字状に形成し、辺ａと辺ｂとは
燃焼室４の開口縁近傍に向けて燃料を噴射するよ
うに、また辺ｃと辺ｄとは燃焼室４の底部に向け
て燃料を噴射するように形成されている。 FIG. 4A shows an enlarged view of the nozzle hole 70. This nozzle hole 70 has a flat slit in the shape of an X, consisting of sides a, b, c, and d. is formed so that fuel is injected toward the vicinity of the opening edge of the combustion chamber 4, and sides c and d are formed so that fuel is injected toward the bottom of the combustion chamber 4.

前記辺ａ、ｂ、ｃ、ｄの幅Ｓと直線状の２辺の
長さＬとの比は次のように決定するのがよい。 The ratio between the width S of the sides a, b, c, and d and the length L of the two straight sides is preferably determined as follows.

Ｓ＝Ｌ／６〜Ｌ／２ 前記のように噴孔７０をＸ字状にすることによ
つて、第５図に示すように燃料噴霧Ｆのうちの上
部の辺ａと辺ｂによる燃料噴霧a′、b′は燃焼室４
の開口縁近傍に噴射され、下部の辺ｃと辺ｄによ
る燃料噴霧c′、d′は燃料室４の底部に向けて噴射
される。 S=L/6 to L/2 By forming the nozzle hole 70 into an X-shape as described above, the fuel spray is formed by the upper side a and side b of the fuel spray F, as shown in FIG. a' and b' are combustion chamber 4
The fuel sprays c' and d' from the lower sides c and d are injected toward the bottom of the fuel chamber 4.

従つて、燃料室４の開口縁近傍では、開口縁全
周にわたりピストンの圧縮行程時の上昇に伴つて
垂直方向の空気渦流、いわゆるスキツシユが生ず
るので、このスキツシユと前記燃料噴霧a′、b′が
迅速にかつ適用に混合される。 Therefore, in the vicinity of the opening edge of the fuel chamber 4, a vertical air vortex, a so-called squish, is generated around the entire circumference of the opening edge as the piston rises during the compression stroke, and this squish and the fuel sprays a' and b' is mixed quickly and on application.

一方、燃焼室４の内部には、吸入空気の導入に
伴つて、水平方向の空気渦流、いわゆるスワール
が生じているので、このスワールと前記燃料噴霧
c′、d′が適切に混合される。 On the other hand, inside the combustion chamber 4, a horizontal air vortex, a so-called swirl, is generated as intake air is introduced.
c′ and d′ are properly mixed.

更に、燃料噴霧Ｆ（a′、b′、c′、d′）はＸ字状に
広がりながら分布するので、空気流との接触面積
（表面積）が著しく増大する。 Furthermore, since the fuel spray F (a', b', c', d') is distributed while spreading in an X-shape, the contact area (surface area) with the air flow increases significantly.

第６図Ａ，Ｂは燃料の噴霧の状態を本発明の燃
料噴射ノズルのＸ字状の噴孔と通常の丸い噴孔と
の場合を比較したものであり、本発明に係る燃料
噴射ノズルの場合には燃料噴霧Ｆの外周の表面積
が増加し燃料噴霧Ｆの進行方向に直角な任意の断
面における矢印で示す空気の導入率が第６図Ｂの
従来の燃料噴射ノズルの丸形の噴孔の場合に比較
して1.6〜５倍と非常に増加していることがわか
る。 Figures 6A and 6B compare the state of fuel spray between the X-shaped nozzle hole of the fuel injection nozzle of the present invention and the case of a normal round nozzle hole. In this case, the surface area of the outer periphery of the fuel spray F increases and the air introduction rate shown by the arrow in an arbitrary cross section perpendicular to the traveling direction of the fuel spray F increases as shown in the round nozzle hole of the conventional fuel injection nozzle shown in FIG. It can be seen that there is a significant increase of 1.6 to 5 times compared to the case of .

因に、同一の断面積の噴孔より噴射された噴霧
ＦについてＸ字状の噴孔よりのものと丸形の噴孔
のものとの任意の断面における空気の接触面積
は、Ｘ字状のものの方が丸形のものに比較して
1.5〜５倍となつている。 Incidentally, for the spray F injected from nozzle holes with the same cross-sectional area, the contact area of air in any cross section between the X-shaped nozzle hole and the round nozzle hole is compared to round objects
It is 1.5 to 5 times.

本発明の噴孔７０は、Ｘ字状スリツトを構成す
る４つの辺（a′、b′、c′、d′）を一点において接
合するように構成したので、燃料噴霧Ｆの腰が強
くなり、直線的なスリツト状噴孔に比較して恰も
断面係数が増加した状態となるためにスワールに
よつて分断され難くなり、着火遅れがなく、燃焼
効率の向上を図ることができる。 Since the nozzle hole 70 of the present invention is configured so that the four sides (a', b', c', d') constituting the X-shaped slit are joined at one point, the stiffness of the fuel spray F is increased. Since the section modulus is significantly increased compared to a straight slit-shaped nozzle hole, it becomes difficult to be separated by swirl, and there is no ignition delay, and combustion efficiency can be improved.

第７図は燃料当量比、スモーク、出力の関係を
示す図であるが、本発明の燃料噴射ノズルのデー
タを曲線Ｘに、また従来の燃料噴射ノズルのデー
タを曲線Ｒに示している。 FIG. 7 is a diagram showing the relationship between fuel equivalence ratio, smoke, and output. Curve X shows data for the fuel injection nozzle of the present invention, and curve R shows data for a conventional fuel injection nozzle.

前記第７図によると本発明の燃料噴射ノズルの
データの曲線Ｘの方が従来の燃料噴射ノズルのデ
ータを示す曲線Ｒに比較して平均有効圧力Pme
が増加し、スモークが低下していることがわか
る。 According to FIG. 7, the average effective pressure Pme of the curve X of the data of the fuel injection nozzle of the present invention is higher than that of the curve R showing the data of the conventional fuel injection nozzle.
It can be seen that the amount of smoke increases and the smoke decreases.

さらに、この改良の効果は、両曲線の間の斜線
で示した部分Ｍで燃料当量の多い部分が著しい。 Furthermore, the effect of this improvement is remarkable in the shaded area M between the two curves, where the fuel equivalent is large.

また、本発明の噴孔７０はＸ字状スリツトから
なるので、凹状燃焼室４の深さに対応してＸ字状
スリツトの交差角度を容易に設定できるため、特
に、浅皿形状燃焼室４に適した燃料噴射ノズルを
提供できる。 Further, since the nozzle hole 70 of the present invention is formed of an X-shaped slit, the intersection angle of the X-shaped slit can be easily set in accordance with the depth of the concave combustion chamber 4. We can provide fuel injection nozzles suitable for

さらに、本発明の燃料噴射ノズルは、少なくと
も噴孔部をセラミツク製としたので、セラミツク
の特性として耐熱性であるので針弁の焼付き、噴
孔の詰り、弁座部の過度の摩耗等、従来の金属性
の燃料噴射ノズルの有する欠点を完全に解消する
ことが可能となる。 Furthermore, since the fuel injection nozzle of the present invention has at least the nozzle hole made of ceramic, ceramic has a property of heat resistance, so it does not cause seizure of the needle valve, clogging of the nozzle hole, excessive wear of the valve seat, etc. It becomes possible to completely eliminate the drawbacks of conventional metallic fuel injection nozzles.

更にまた、噴孔部をセラミツク材により構成す
ることにより、焼結前に成型品に噴孔としての細
孔を予めあけた後に焼成することができるため、
前記噴孔のＸ字状の形状を形成することが簡単に
できると共に、噴孔の壁の粗さは0.8s以下とする
ことができるので、燃料がこの噴孔を通過する際
の抵抗を減少することが可能である。 Furthermore, by constructing the nozzle hole part from a ceramic material, it is possible to pre-drill pores as nozzle holes in the molded product before sintering, and then fire the molded product.
The X-shaped shape of the nozzle hole can be easily formed, and the wall roughness of the nozzle hole can be made less than 0.8s, reducing the resistance when the fuel passes through the nozzle hole. It is possible to do so.

尚、前記実施例では噴孔部のみをセラミツク材
により構成した燃料噴射ノズルの例を示したが、
本発明はこの実施例に限定されるものではなく、
例えば、弁体がセラミツク材で構成されたものに
も応用できることは当然である。 Incidentally, in the above embodiment, an example of a fuel injection nozzle in which only the injection hole portion was made of ceramic material was shown.
The present invention is not limited to this example,
For example, it goes without saying that the present invention can also be applied to valve bodies made of ceramic material.

以上詳述したように、本発明の直噴式デイーゼ
ルエンジン用燃料噴射ノズルは、ピストンの頂部
に凹状燃焼室を設けてなる直噴式デイーゼルエン
ジンの前記燃焼室に燃料を噴射する燃料噴射ノズ
ルの噴孔部に、前記燃焼室の開口縁近傍に向けて
燃料を噴射する上部の２辺と前記燃焼室の底部に
向けて燃料を噴射する下部の２辺とを有するＸ字
状スリツトからなる噴孔を形成したことを特徴と
するので、以下の効果を得ることができる。 As described above in detail, the fuel injection nozzle for a direct injection diesel engine of the present invention has a nozzle hole of a fuel injection nozzle that injects fuel into the combustion chamber of a direct injection diesel engine that has a concave combustion chamber provided at the top of a piston. A nozzle hole consisting of an X-shaped slit having two upper sides for injecting fuel toward the vicinity of the opening edge of the combustion chamber and two lower sides for injecting fuel toward the bottom of the combustion chamber. The following effects can be obtained.

即ち、燃焼室の開口縁近傍では、開口縁全周に
わたつて生ずるスキツシユと前記上部の２辺
（ａ、ｂ）からの燃料噴霧（a′、b′）とが適切に
混合し、燃焼室の内部では、側壁面に沿つて生じ
ているスワールと前記下部の２辺（ｃ、ｄ）から
の燃焼噴霧（c′、d′）が適切に混合させるので、
全体として燃料噴霧Ｆと空気の混合が大巾に促進
される効果がある。 That is, in the vicinity of the opening edge of the combustion chamber, the fuel spray (a', b') from the two upper sides (a, b) is appropriately mixed with the squish generated around the entire circumference of the opening edge, and Inside, the swirl generated along the side wall surface and the combustion spray (c', d') from the lower two sides (c, d) mix appropriately, so that
Overall, there is an effect of greatly promoting the mixing of the fuel spray F and air.

さらに、燃料噴霧Ｆは、Ｘ字状に広がりながら
分布するので、空気流との接触面積（表面積）が
著しく増大するので、上述の如き燃料噴霧Ｆと空
気との混合促進が一段と向上する効果がある。 Furthermore, since the fuel spray F is distributed while spreading in an X-shape, the contact area (surface area) with the air flow increases significantly, so that the above-mentioned effect of promoting the mixing of the fuel spray F and air is further improved. be.

また、本発明の燃料噴射ノズルの噴孔は、Ｘ字
状スリツトを構成する４つの辺（ａ、ｂ、ｃ、
ｄ）を一点において接合するように構成されてい
るので、燃料噴霧Ｆの腰が強くなり、単なる一文
字状スリツトからなる噴孔より噴射された燃料噴
霧のようにスワールによつて分断されるおそれが
なくなり、着火遅れがなく、燃焼効率が向上する
効果がある。 Further, the nozzle hole of the fuel injection nozzle of the present invention has four sides (a, b, c,
d) is configured to join at one point, the fuel spray F becomes stiff and there is no risk of it being separated by swirls like the fuel spray injected from a nozzle hole consisting of a simple linear slit. This has the effect of improving combustion efficiency without causing any ignition delay.

さらに、本発明の燃料噴霧ノズルの噴孔は、Ｘ
字状スリツトにより構成されているので、燃料室
の深さに対応してＸ字状スリツトの交差角度を容
易に設定できるため、特に、浅皿形凹状燃焼室に
適した燃料噴射ノズルを提供できる効果がある。 Furthermore, the nozzle hole of the fuel spray nozzle of the present invention is
Since it is composed of letter-shaped slits, the intersection angle of the X-shaped slits can be easily set in accordance with the depth of the fuel chamber, so it is possible to provide a fuel injection nozzle that is particularly suitable for shallow dish-shaped concave combustion chambers. effective.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の燃料噴射ノズルの一部破断によ
る側断面図、第２図は同噴射ノズルの噴孔の正面
図である。第３図は本発明の実施例における燃料
噴射ノズルの一部破断による側面図、第４図は同
噴射ノズルの先端部の拡大断面図、第４図Ａは同
噴射ノズルの先端に位置する噴孔部に形成された
Ｘ字状の噴孔の拡大正面図である。又、第５図は
本発明に係る燃料噴射ノズルより燃料が燃焼室内
に噴射される状態を示す図であり、第６図は本発
明に係る同噴射ノズルのＸ字状の噴孔と従来の丸
形噴孔との燃料噴霧が空気を巻き込む状態を説明
する図、第７図は本発明の作用効果を示す図で、
有効平均圧力とスモークとが燃料当量比について
変化する状況を示す図である。 １，１０……燃料噴射ノズル、２……シリンダ
ヘツド、３……先端部、６０……噴孔部、４……
燃焼室、５……針弁、６……弁本体、７，７０…
…噴孔、８……弁座部、９……ノズルナツト、６
１……キー溝、６３，９１……ねじ部。 FIG. 1 is a partially cutaway side sectional view of a conventional fuel injection nozzle, and FIG. 2 is a front view of the nozzle hole of the same injection nozzle. FIG. 3 is a partially cutaway side view of a fuel injection nozzle according to an embodiment of the present invention, FIG. 4 is an enlarged sectional view of the tip of the injection nozzle, and FIG. 4A is an injection nozzle located at the tip of the injection nozzle. It is an enlarged front view of the X-shaped nozzle hole formed in the hole part. Moreover, FIG. 5 is a diagram showing a state in which fuel is injected into the combustion chamber from the fuel injection nozzle according to the present invention, and FIG. 6 is a diagram showing the X-shaped nozzle hole of the injection nozzle according to the present invention and the conventional one. FIG. 7 is a diagram illustrating the state in which air is drawn into the fuel spray with the round nozzle hole, and FIG. 7 is a diagram illustrating the effects of the present invention.
FIG. 3 is a diagram illustrating how effective average pressure and smoke vary with fuel equivalence ratio. 1, 10...Fuel injection nozzle, 2...Cylinder head, 3...Tip portion, 60...Nozzle hole portion, 4...
Combustion chamber, 5... Needle valve, 6... Valve body, 7, 70...
...Nozzle hole, 8...Valve seat, 9...Nozzle nut, 6
1...Keyway, 63, 91...Threaded part.

【表】【table】

Claims (1)

【特許請求の範囲】[Claims] １ ピストンの頂部に凹状燃焼室を設けてなる直
噴式デイーゼルエンジンの前記燃焼室に燃料を噴
射する燃料噴射ノズルの噴孔部に、前記燃焼室の
開口縁近傍に向けて燃料を噴射する上部の２辺と
前記燃焼室の底部に向けて燃料を噴射する下部の
２辺とを有するＸ字状スリツトからなる噴孔を形
成したことを特徴とする直噴式デイーゼルエンジ
ン用燃料噴射ノズル。1. In a direct injection diesel engine having a concave combustion chamber provided at the top of a piston, an upper part that injects fuel toward the vicinity of the opening edge of the combustion chamber is inserted into the nozzle of a fuel injection nozzle that injects fuel into the combustion chamber. 1. A fuel injection nozzle for a direct injection type diesel engine, characterized in that an injection hole is formed with an X-shaped slit having two sides and two lower sides for injecting fuel toward the bottom of the combustion chamber.
JP2398782A 1982-02-17 1982-02-17 Fuel injection nozzle for engine Granted JPS58143163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2398782A JPS58143163A (en) 1982-02-17 1982-02-17 Fuel injection nozzle for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2398782A JPS58143163A (en) 1982-02-17 1982-02-17 Fuel injection nozzle for engine

Publications (2)

Publication Number Publication Date
JPS58143163A JPS58143163A (en) 1983-08-25
JPH0565712B2 true JPH0565712B2 (en) 1993-09-20

Family

ID=12125925

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2398782A Granted JPS58143163A (en) 1982-02-17 1982-02-17 Fuel injection nozzle for engine

Country Status (1)

Country Link
JP (1) JPS58143163A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3927390A1 (en) * 1989-08-19 1991-02-21 Bosch Gmbh Robert FUEL INJECTION VALVE
US5368237A (en) * 1992-11-23 1994-11-29 Nordson Corporation Power coating guns with improved spray nozzles and improved method of power coating
CN102720612A (en) * 2012-07-07 2012-10-10 中国船舶重工集团公司第七�三研究所 Fuel injector with perturbation spray nozzle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5843669Y2 (en) * 1978-06-09 1983-10-03 日産デイ−ゼル工業株式会社 fuel injection nozzle
JPS56106062A (en) * 1980-01-26 1981-08-24 Hino Motors Ltd Hole nozzle

Also Published As

Publication number Publication date
JPS58143163A (en) 1983-08-25

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