JPS61272460A - Electromagnetic type fuel injection valve - Google Patents
Electromagnetic type fuel injection valveInfo
- Publication number
- JPS61272460A JPS61272460A JP11509885A JP11509885A JPS61272460A JP S61272460 A JPS61272460 A JP S61272460A JP 11509885 A JP11509885 A JP 11509885A JP 11509885 A JP11509885 A JP 11509885A JP S61272460 A JPS61272460 A JP S61272460A
- Authority
- JP
- Japan
- Prior art keywords
- flow
- injection hole
- fuel
- holes
- flow path
- 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
Landscapes
- 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、主に１気筒あたり２個の吸気弁を有する自動
車用４バルブエンジンに対して燃料を噴射供給する電磁
式燃料噴射弁に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic fuel injection valve that mainly injects and supplies fuel to a four-valve automobile engine having two intake valves per cylinder. It is.
従来より公知の電磁式燃料噴射弁は内部に電磁コイルを
備え、この電磁コイルに対して電気信号を供給すること
でニードル弁等の弁体が作動し、噴射孔より燃料をエン
ジンに噴射供給するものであった。このような燃料噴射
弁は電磁コイルへの電気信号をエンジン制御ユニットに
より制御することで、エンジンの作動状態に対応した最
適の燃料供給が実現できるものである。Conventionally known electromagnetic fuel injection valves have an internal electromagnetic coil, and by supplying an electric signal to this electromagnetic coil, a valve body such as a needle valve is actuated, and fuel is injected into the engine from the injection hole. It was something. Such a fuel injection valve can realize optimal fuel supply corresponding to the operating state of the engine by controlling an electric signal to the electromagnetic coil by an engine control unit.
ところで、近年エンジンの各気筒に吸気弁を２個づつ設
けて特に高速回転時の吸気抵抗を小さくなし、エンジン
出力を高く維持することが試みられている。かかるエン
ジンでは吸気管が各気筒に対応して複数に分岐し、さら
に各吸気弁に対応して２方向に分岐しており、通常、燃
料噴射弁は各気筒に対応して２方向に分岐する部分より
上流位置に取付けられる。Incidentally, in recent years, attempts have been made to provide two intake valves in each cylinder of an engine to reduce intake resistance especially at high speed rotation and to maintain high engine output. In such an engine, the intake pipe branches into a plurality of pipes corresponding to each cylinder, and further branches into two directions corresponding to each intake valve, and usually, the fuel injection valve branches into two directions corresponding to each cylinder. It is installed upstream of the section.
しかしながら従来の燃料の噴射方向が１方向しかない燃
料噴射弁を上記の位置に取付けた場合、燃料が途中の吸
気管の壁面に付着し、空気と燃料との混合が悪く、エン
ジンの過渡特性に遅れを生じるものであった。However, when a conventional fuel injector, which only injects fuel in one direction, is installed in the above position, fuel adheres to the wall of the intake pipe in the middle, resulting in poor mixing of air and fuel, which affects the transient characteristics of the engine. This caused delays.
このような点から燃料が途中の吸気管ψ壁面に付着する
のを防止し、エンジンの過渡特性向上を意図して、燃料
の噴射方向を吸気弁に向けて２方向に分割する構成の電
磁式燃料噴射弁が日本電装公開枝軸・整理番号３３−０
６５に示されている。In order to prevent fuel from adhering to the wall surface of the intake pipe in the middle, and to improve the transient characteristics of the engine, the electromagnetic type is configured to split the fuel injection direction into two directions toward the intake valve. The fuel injector is made by Nippondenso, serial number 33-0.
65.
従来より、エンジンのアイドリング時や減速時のように
、燃料噴射弁が取付けられた吸気管内部が負圧下にさら
された時、あるいは高速運転後の再始動時などのデッド
ソーク時のように、燃料噴射弁や燃料が高温にさらされ
た時には、燃料内にペーパーが発生しやすくなるもので
ある。そして上記公開枝軸に示された燃料噴射弁では、
噴射孔部分の下流側に噴射孔から噴射された燃料流を２
方向に分流する孔が形成されたプレート（分流部材）を
備えており、バルブボディの単孔部分からプレートの２
孔部分への燃料の流れ経路中に燃料流のスムーズな流れ
を阻害する段状の部分が数多く形成され、２孔を燃料流
の流量を絞らない程度の通路面積としても燃料のスムー
ズな流れを阻害されるために、その部分でペーパーの発
生が助長されるようになり、上記のようｌ負圧あるいは
高温の状態ではペーパーが発生し、燃料噴射弁から噴射
供給される燃料量が所望の量より減少するという問題点
があり、高精度の調量が不可能なものであった。Conventionally, fuel leakage occurs when the inside of the intake pipe to which the fuel injection valve is attached is exposed to negative pressure, such as when the engine is idling or decelerating, or when there is a dead soak such as when restarting after high-speed operation. When the injection valve or fuel is exposed to high temperatures, paper tends to form in the fuel. And in the fuel injection valve shown in the public branch axis above,
The fuel flow injected from the injection hole to the downstream side of the injection hole is
It is equipped with a plate (flow diversion member) in which a hole is formed to divide the flow in the direction, and the valve body is equipped with a plate (flow diversion member) in which the flow is divided into two directions.
Many step-shaped parts are formed in the fuel flow path to the hole portion, which obstructs the smooth flow of the fuel flow, and even if the two holes have a passage area that does not restrict the flow rate of the fuel flow, the smooth flow of the fuel can be prevented. As a result, the generation of paper is promoted in that area, and as described above, under negative pressure or high temperature conditions, paper is generated, and the amount of fuel injected from the fuel injection valve is reduced to the desired amount. There is a problem in that the amount decreases further, making it impossible to measure with high precision.
従って、本発明の目的とすることは、噴射孔からの燃料
流が分流部材の２個の孔へとスムーズに流入し、ペーパ
ー発生を助長する要因をできるだけ少なくして、負圧や
高温の状態においても充分な高精度で調量が可能な電磁
式燃料噴射弁を提供することにある。Therefore, an object of the present invention is to allow the fuel flow from the injection hole to smoothly flow into the two holes of the flow dividing member, to minimize the factors that promote paper generation, and to reduce the amount of fuel under negative pressure and high temperature conditions. It is an object of the present invention to provide an electromagnetic fuel injection valve that is capable of metering with sufficiently high accuracy even in the case of the present invention.
上記の問題点を解決するために、本発明においては、ハ
ウジング内部に設けられた電磁コイルと、このハウジン
グに連結されたボディ内に摺動可能の状態で配設され、
電磁コイルに電気信号を供給することにより変動するニ
ードル弁と、ボディの端部に形成され、ニードル弁の変
動に応じて燃料が噴射される噴射孔と、ボディの噴射孔
の形成された端部に設けられ、噴射孔から噴射された燃
料流を２方向に分流させる流路が形成された分流部材と
を備え、この分流部材の流−路は噴射孔に対応する位置
に形成され、噴射孔からの燃料流の入口は２個の円の一
部が互いに重なり合った形状で開ロし、噴射孔の出口中
心は゛この入口の２個の円の一部が互いに重なり合った
部分の中心と対応し、この入口は噴射孔の出口と対応す
る部分で噴射孔の出口の開口範囲を収納できる大きさで
あり、この入口より所定の角度で各々一定の径の２個の
孔として分流部材内にて分岐し、端部の２ケ所で外部空
間に対して開口しており、噴射孔の流路面積をＳ１、分
流部材の流路である分岐した２個の孔の流路面積の和を
８２とした時、その面積比Ｓ２／Ｓ＋ は、
６≦Ｓｚ／Ｓ＋ ≦８
であることを特徴とする電磁式燃料噴射弁としている。In order to solve the above problems, in the present invention, an electromagnetic coil is provided inside a housing, and an electromagnetic coil is slidably disposed within a body connected to the housing.
A needle valve that fluctuates by supplying an electric signal to an electromagnetic coil, an injection hole that is formed at the end of the body and injects fuel in response to fluctuations in the needle valve, and an end of the body where the injection hole is formed. The flow path of the flow dividing member is formed at a position corresponding to the injection hole, and the flow path of the flow dividing member is formed at a position corresponding to the injection hole. The inlet of the fuel flow from the inlet opens in the shape of two circles partially overlapping each other, and the center of the outlet of the injection hole corresponds to the center of the part of the two circles of this inlet partially overlapping each other. , this inlet corresponds to the outlet of the injection hole and has a size that can accommodate the opening range of the outlet of the injection hole, and two holes each having a constant diameter are formed at a predetermined angle from this inlet in the flow dividing member. It is branched and opens to the external space at two places at the end, and the flow path area of the injection hole is S1, and the sum of the flow path areas of the two branched holes, which are the flow paths of the flow dividing member, is 82. In this case, the area ratio S2/S+ satisfies the following: 6≦Sz/S+≦8.
上記の構成によれば、噴射孔から分流部材の流路へと流
入する燃料流は、流路の入口が噴射孔の出口を確実にカ
バーしているので、スムーズに流、入する。また、噴射
孔の流路面積と分流部材の流路の流路面積の和との比が
上記の値の間にあることで、流れが絞られることはなく
、さらに良好な噴霧が分流部材の２個の出口側開口部分
より噴射される。According to the above configuration, the fuel flow flowing from the injection hole into the flow path of the flow dividing member flows smoothly because the inlet of the flow path reliably covers the outlet of the injection hole. In addition, since the ratio of the flow path area of the injection hole to the sum of the flow path area of the flow path of the flow dividing member is between the above values, the flow is not restricted, and even better spraying is achieved through the flow dividing member. It is injected from two outlet side openings.
以下、本発明の一実施例を図面に基づいて説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図において、電磁式燃料噴射弁１００のハウジング
１は段付き筒状をなし、ハウジングｌの大径部には、ス
プール２に巻回して電磁コイル３が配しである。スプー
ル２には上方より筒状の鉄心４が貫設してあり、鉄心４
は上端部を燃料供給管の接続部となすとともにその筒壁
より突出せしめたフランジ部を△ウジフグ１の上方開口
縁にかしめ固定しである。鉄心４の上方開口にはフィル
タ４１が配設され、かつ筒内には燃料流通路をなすアジ
ャストパイプ４２が固定しである。ハウジング１の上面
には給電用コネクタ５が樹脂により一体成形してあり、
上記電磁コイル３はコネクタピン５１に接続しである。In FIG. 1, a housing 1 of an electromagnetic fuel injection valve 100 has a stepped cylindrical shape, and an electromagnetic coil 3 is arranged around a spool 2 in a large diameter portion of the housing 1. A cylindrical iron core 4 extends through the spool 2 from above.
The upper end serves as a connection part for a fuel supply pipe, and the flange part protruding from the cylinder wall is caulked and fixed to the upper opening edge of the △Uji puffer 1. A filter 41 is disposed at the upper opening of the iron core 4, and an adjustment pipe 42 forming a fuel flow path is fixed inside the cylinder. A power supply connector 5 is integrally molded with resin on the top surface of the housing 1.
The electromagnetic coil 3 is connected to a connector pin 51.
ハウジングｌの小径部にはスペーサ６１を介してボディ
６がかしめ固定してあり、ボディ６の、下方へ突出せし
めた端面には噴射孔６２が形成しである。ボディ６内に
は上方よりニードル弁７が摺動可能な状態で貫装してあ
り、ニードル弁７の先端は円錐形状に形成してあり、ニ
ードル弁の略中夫にはスペーサ６１と対向してストッパ
７１が形成しである。ニードル弁７の上端には可動コア
７２が鉄心４と対向して連結してあり、可動コア７２は
これとアジャストパイプ４２間に配したコイルバネ７３
により下方へ付勢されている。A body 6 is caulked and fixed to the small diameter portion of the housing l via a spacer 61, and an injection hole 62 is formed in the end surface of the body 6 that projects downward. A needle valve 7 is slidably inserted into the body 6 from above, and the tip of the needle valve 7 is formed into a conical shape. A stopper 71 is formed. A movable core 72 is connected to the upper end of the needle valve 7 facing the iron core 4, and the movable core 72 is connected to a coil spring 73 disposed between the movable core 72 and the adjustment pipe 42.
is urged downward by.
ボディ６の噴射孔６２が形成しである端部には、分流部
材８が圧入固定されており、この分流部材８には噴射孔
６２に対応して噴射孔６２からの燃料流を所定の２方向
に分流する２個の孔８１が形成されている。A flow dividing member 8 is press-fitted into the end of the body 6 where the injection hole 62 is formed, and the flow dividing member 8 divides the fuel flow from the injection hole 62 into a predetermined 2 points corresponding to the injection hole 62. Two holes 81 are formed to separate the flow in the direction.
上記燃料噴射弁１００に対して電磁コイル３に電気信号
を供給すると可動コア７２がばね力に抗して鉄心４側に
吸引され、この結果スペース６１とストッパ７１とが当
接するまでニードル弁７が上方へ移動し、アジャストパ
イプ４２より可動コア７２を経てニードル弁７の外周に
至った燃料が噴射孔６２より噴射され、分流部材８の′
２個の孔８１により分流される。When an electric signal is supplied to the electromagnetic coil 3 of the fuel injection valve 100, the movable core 72 is attracted toward the iron core 4 against the spring force, and as a result, the needle valve 7 is moved until the space 61 and the stopper 71 come into contact with each other. The fuel that has moved upward and reached the outer periphery of the needle valve 7 from the adjustment pipe 42 via the movable core 72 is injected from the injection hole 62 and is
The two holes 81 separate the flow.
そして、第２図に噴射孔６２部分の拡大断面図を示す。FIG. 2 shows an enlarged sectional view of the injection hole 62 portion.
ボディ６の噴射孔６２は精度よ（形成されており、ボデ
ィ６内を通過した燃料は噴射孔６２により所定量に絞ら
れる。ボディ６の先端に設けられた分流部材８は、ボデ
ィ６の先端との間に隙間８２を介在させており、分流部
材８の噴射孔６２と対向して形成される噴射孔６２から
噴射された燃料流の流入する入口は第３図に示すごとく
、２個の円の一部が互いに重なり合った形状をしている
。そして噴射孔６２の出口の中心と２個の孔８１への入
口の円の一部が互いに重なり合った部分、つまり燃料流
を２方向に分岐させる隔壁８３の先端の中心とは略一致
するよう配置されており、２個の孔８１への入口部分よ
りこの２個の孔８１は噴射孔６２を中心線として広がり
角度θだけ開いて形成されており、２個の孔８１は分流
部材８内にて分岐し、その２個の孔８１の出口は各々円
形状に外部空間へと開口している。また孔８１の径は一
定のものであって、両方とも同一の径ｄであり、噴射孔
６２の径りよりも大きいものである。The injection holes 62 of the body 6 are formed with high precision, and the fuel passing through the body 6 is narrowed down to a predetermined amount by the injection holes 62. As shown in FIG. Parts of the circles overlap each other.The center of the outlet of the injection hole 62 and the part of the circle at the entrance to the two holes 81 overlap each other, that is, the fuel flow is split into two directions. The two holes 81 are arranged so as to substantially coincide with the center of the tip of the partition wall 83, and from the entrance portion to the two holes 81, the two holes 81 are formed with the injection hole 62 as the center line and are opened by an angle θ. The two holes 81 are branched within the flow dividing member 8, and the exits of the two holes 81 each open into the external space in a circular shape.The diameter of the holes 81 is not constant. Both have the same diameter d, which is larger than the diameter of the injection hole 62.
さらに２個の孔８１の入口側の重なり合つた部分の長さ
は噴射孔６２の径よりも長（しである。Furthermore, the length of the overlapping portion on the inlet side of the two holes 81 is longer than the diameter of the injection hole 62.
これは噴射孔６２からの燃料流が分流部材８の入口側端
部８４に衝突しないようにするためであり、これにより
噴射孔６２からの燃料流の２個の孔８１の入口側への流
れが極めてスムーズなものとなる。例えば、入口側の各
径８１の中心距離をＸとした場合、重なり合った部分の
長さＰは、であり、この重なり合った部分の長さＰが噴
射孔６２の径りよりも大きい。つまり
Ｄ≦ ｄｔ−）（！
という条件を満たしている。This is to prevent the fuel flow from the injection hole 62 from colliding with the inlet side end 84 of the flow dividing member 8, so that the fuel flow from the injection hole 62 is directed toward the inlet side of the two holes 81. becomes extremely smooth. For example, when the center distance of each diameter 81 on the inlet side is set to X, the length P of the overlapping portion is, and the length P of this overlapping portion is larger than the diameter of the injection hole 62. In other words, the condition D≦dt-)(!) is satisfied.
また噴射孔６２の流路面積Ｓ１と分流部材８の２個の孔
８１の流路面積の和Ｓ２とは以下の関係を満たしている
。Further, the flow path area S1 of the injection hole 62 and the sum S2 of the flow path area of the two holes 81 of the flow dividing member 8 satisfy the following relationship.
６≦Ｓｔ／Ｓｔ ≦８
つまり、
６≦２・ （ｄ／Ｄ＞” ≦８
これは、本発明者らの実験によれば第４図に示すごとく
、流路面積比Ｓ！／Ｓｌが６倍以下である場合、負圧あ
るいは高温時では噴射孔６２で調量された燃料が２個の
径８１で絞られるためペーパーが発生し易く、ペーパー
発生により圧力損失をきたし所望の流量より低下してし
まうが、６倍以上であればペーパーの発生が抑えられ、
また発生しても充分な流路があるので圧力損失が少ない
ので低下することはなく、また８倍以上にすると広すぎ
て２個の孔８１の出口からの噴霧に乱れが生じ、粒径が
粗くなるが、８倍以上では略良好な噴霧が得られること
が確認されているからである。6≦St/St≦8 In other words, 6≦2・(d/D>”≦8 This means that according to the experiments conducted by the present inventors, as shown in FIG. 4, the channel area ratio S!/Sl is 6 If it is less than twice that, under negative pressure or high temperature, the fuel metered by the injection hole 62 is squeezed by the two diameters 81, which tends to generate paper, which causes pressure loss and lowers the flow rate than the desired flow rate. However, if it is 6 times or more, the generation of paper can be suppressed,
In addition, even if it occurs, there is a sufficient flow path, so the pressure loss is small, so it will not drop, and if it is made 8 times or more, it will be too wide, causing turbulence in the spray from the exits of the two holes 81, and reducing the particle size. This is because it has been confirmed that substantially good spraying can be obtained at 8 times or more, although it becomes coarser.
以上の各条件を満たすことで、噴霧孔６２から噴射され
た燃料は分流部材８の２個の孔８１の入口で入口側端面
８４に衝突することなく、スムーズに流入し、２個の孔
８１の流路面積が噴射孔６“２の流路面積に対し充分に
あるので、ペーパーの発生は抑えられるようになり、ま
た２個の孔８１の部分でペーパーが発生しても、孔８１
の流路面積が噴射孔６２流路面積に対し、充分あるので
、圧力損失が少なく、負圧や高温の状態でも充分に高精
度の調量が可能であり、また面積比Ｓ ！ ／ Ｓ ｌ
を８倍以下とすることで良好な噴霧も得られるようにな
る。By satisfying each of the above conditions, the fuel injected from the spray holes 62 smoothly flows into the two holes 81 of the flow dividing member 8 without colliding with the inlet side end surface 84 at the inlets of the two holes 81. Since the flow path area of the injection hole 6"2 is sufficiently large compared to the flow path area of the injection hole 6"2, the generation of paper can be suppressed, and even if paper is generated in the area of the two holes 81, the flow path area of the hole 81
Since the flow path area of S is sufficiently larger than the flow path area of the injection hole 62, pressure loss is small, and metering with high precision is possible even under negative pressure or high temperature conditions, and the area ratio S! / S l
By making the amount 8 times or less, good atomization can also be obtained.
さらに、上記の条件以外に以下のような条件を加えても
かまわない。Furthermore, the following conditions may be added in addition to the above conditions.
（１） 孔８１の長さをＬとした場合、その細長比Ｌ
／ｄは
１≦Ｌ／ｄ≦２
である。(1) When the length of the hole 81 is L, its slenderness ratio L
/d is 1≦L/d≦2.
（２） 隙間８２の距離をＭとした場合、０、２ ｍ
＋＊≦Ｍ≦１． Ｏｎｕｍ
である。(2) If the distance of the gap 82 is M, then 0.2 m
+*≦M≦1. Onum.
（１）の条件は本発明者らの実験によれば、第５図に示
すごとく、２個の孔８１から噴射される燃料流の広がり
角度をθとなるように２個の孔８１の広がり角度をθに
設定したのに対し、細長比Ｌ／ｄ＜ｌであると２個の孔
８１から噴射された燃料流はθより小さな角度となって
しまうが、Ｌ／ｄ≧１であれば設定された広がり角度θ
が得られるようになり、またＬ／ｄ＞２であると負圧や
高温の状態では径に対し長すぎるために孔８１内でペー
パーが発生しやすくなり、ペーパー発生により圧力損失
が生じ２個の孔８１からの燃料の流量は低下するが、Ｌ
／ｄ≦２であれば、燃料の流量の低下はほとんどないも
のであることが確認されるからである。According to the experiments conducted by the present inventors, the condition (1) is such that the two holes 81 are widened so that the spreading angle of the fuel flow injected from the two holes 81 is θ, as shown in FIG. While the angle is set to θ, if the slenderness ratio L/d<l, the fuel flow injected from the two holes 81 will have an angle smaller than θ, but if L/d≧1 Set spread angle θ
In addition, if L/d>2, under negative pressure or high temperature conditions, paper is likely to be generated inside the hole 81 because it is too long for the diameter, and paper generation causes pressure loss and two pieces. Although the flow rate of fuel from the hole 81 of L decreases,
This is because if /d≦2, it is confirmed that there is almost no decrease in the fuel flow rate.
（２）の条件は本発明者らの実験によれば、第６図に示
すごとく、Ｍ＜０．２ｍ＋ｎであると負圧や高温の状態
では噴射孔６２の出口と、２個の孔８１の２方向に燃料
を分岐させる隔壁８３との距離が接近しすぎているので
、この部分でペーパーが発生しやすく、ペーパー発生に
より圧力損失が生じ、２個の孔８１からの燃料の流量は
−極めて悪化するが、Ｍ≧０．２ｍｍとすることで燃料
の流量の低下はほとんどな（なり、また略Ｍ ＞ １
ｍｍ以上となり、二一ドル弁７のシート面から２個の孔
８１出口までの容積、つまりデッドボリュームが増すと
、２個の孔８１の先端より燃料のボタ落ち等が生じるこ
とが確認されているからである。According to the experiments conducted by the present inventors, the condition (2) is as shown in FIG. 6. When M<0.2m+n, the outlet of the injection hole 62 and the two holes 81 Since the distance to the partition wall 83 that branches the fuel in two directions is too close, paper is likely to be generated in this area, and the paper generation causes pressure loss, and the flow rate of fuel from the two holes 81 is - However, by setting M≧0.2mm, there is almost no decrease in the fuel flow rate (and approximately M > 1
It has been confirmed that if the volume from the seat surface of the 21-dollar valve 7 to the outlet of the two holes 81, that is, the dead volume, increases, fuel drips from the tips of the two holes 81. Because there is.
なお、上記構成では２個の孔８１の径を同一としたが異
なる径であってもかまわないが、極端に大きさを変える
ことは好ましくない。Note that in the above configuration, the diameters of the two holes 81 are the same, but they may have different diameters, but it is not preferable to drastically change the sizes.
以上述べたように、本発明によれば、ハウジング内部に
設けられた電磁コイルと、このハウジングに連結された
ボディ内に摺動可能の状態で配設され、電磁コイルに電
気信号を供給することにより変動するニードル弁と、ボ
ディの端部に形成され、ニードル弁の変動に応じて燃料
が噴射される噴射孔と、ボディの噴射孔の形成された端
部に設けられ、噴射孔から噴射された燃料流を２方向に
分流させる流路が形成された分流部材とを備え、この分
流部材の流路は噴射孔に対応する位置に形成され、噴射
孔からの燃料流の入口は２個の円の一部が互いに重なり
合った形状で開口し、噴射孔の出口中心はこの入口の２
個の円の一部が互いに重なり合った部分の中心と対応し
、この入口は噴射孔の出口と対応する部分で噴射孔の出
口の開口範囲を収納できる大きさであり、この入口より
所定の角度で各々一定の径の２個の孔として分流部材内
にて分岐し、端部の２ケ所で外部空間に対して開口して
おり、噴射孔の流路面積をＳｌ、分流部材の流路である
分岐した２個の孔の流路面積の和を８２とした時、その
面積比Ｓｔ／Ｓｔ は、６≦３２／Ｓｔ ≦８
であることを特徴とする電磁式燃料噴射弁としたことか
ら、噴射孔から分流部材の２個の孔の出口までの間に燃
料流に対してペーパー発生を助長する要因が充分に抑え
られており、負圧や高温の状態での圧力損失は少なくな
り、従って充分な高精度で調量が実現可能となると共に
、上記のごとく面積比を保持することで良好な噴霧が２
個の孔から噴射されるという優れた効果がある。As described above, according to the present invention, the electromagnetic coil is provided inside the housing, and the electromagnetic coil is slidably disposed within the body connected to the housing, and supplies an electric signal to the electromagnetic coil. A needle valve that fluctuates depending on the movement of the needle valve, an injection hole that is formed at the end of the body and injects fuel according to the fluctuation of the needle valve, and an injection hole that is provided at the end of the body where the injection hole is formed and that injects fuel from the injection hole. The flow path of this flow dividing member is formed at a position corresponding to the injection hole, and the inlet of the fuel flow from the injection hole is formed in two directions. The openings are formed in such a way that parts of the circles overlap each other, and the exit center of the injection hole is located at the two entrances.
This inlet corresponds to the center of the part where some of the circles overlap each other, and this inlet corresponds to the outlet of the injection hole, and is large enough to accommodate the opening range of the outlet of the injection hole, and is located at a predetermined angle from this inlet. The flow path area of the injection hole is Sl, and the flow path of the flow path of the flow dividing member is divided into two holes with a constant diameter. When the sum of the flow path areas of two branched holes is 82, the area ratio St/St is 6≦32/St≦8. , factors that promote paper formation in the fuel flow between the injection hole and the outlet of the two holes in the flow dividing member are sufficiently suppressed, and pressure loss under negative pressure and high temperature conditions is reduced. Therefore, metering can be achieved with sufficient precision, and by maintaining the area ratio as described above, good spraying can be achieved.
It has the excellent effect of being sprayed from several holes.
第１図は本発明の電磁式燃料噴射弁の一実施例を示す断
面図、第２図は第１図図示の電磁式燃料噴射弁の部分断
面図、第３図は第２図Ａ−Ａ断面における２孔の孔の入
口側を示す図、第４図〜第６図は本発明者らの実験結果
を示すグラフである。
１・・・ハウジング、３・・・電磁コイル、６・・・ボ
ディ、７・・・ニードル弁、８・・・分流部材、６２・
・・噴射孔、８１・・・孔、８２・・・隙間、８４・・
・入口側端面、１゜Ｏ・・・電磁式燃料噴射弁。
代理人弁理士 岡 部 隆
第１図FIG. 1 is a sectional view showing an embodiment of the electromagnetic fuel injection valve of the present invention, FIG. 2 is a partial sectional view of the electromagnetic fuel injection valve shown in FIG. The figure showing the inlet side of the two holes in the cross section, and FIGS. 4 to 6 are graphs showing the experimental results of the present inventors. DESCRIPTION OF SYMBOLS 1... Housing, 3... Electromagnetic coil, 6... Body, 7... Needle valve, 8... Diversion member, 62...
...Injection hole, 81...hole, 82...gap, 84...
・Inlet side end face, 1°O...Electromagnetic fuel injection valve. Representative Patent Attorney Takashi Okabe Figure 1
Claims (1)
ハウジングに連結されたボディ内に摺動可能の状態で配
設され、電磁コイルに電気信号を供給することにより変
動するニードル弁と、ボディの端部に形成され、ニード
ル弁の変動に応じて燃料が噴射される噴射孔と、ボディ
の噴射孔の形成された端部に設けられ、噴射孔から噴射
された燃料流を２方向に分流させる流路が形成された分
流部材とを備え、この分流部材の流路は噴射孔に対応す
る位置に形成され、噴射孔からの燃料流の入口は２個の
円の一部が互いに重なり合った形状で開口し、噴射孔の
出口中心はこの入口の２個の円の一部が互いに重なり合
った部分の中心と対応し、この入口は噴射孔の出口と対
応する部分で噴射孔の出口の開口範囲を収納できる大き
さであり、この入口より所定の角度で各々一定の径の２
個の孔として分流部材内にて分岐し、端部の２ケ所で外
部空間に対して開口しており、噴射孔の流路面積をＳ＿
１、分流部材の流路である分岐した２個の孔の流路面積
の和をＳ＿２とした時、その面積比Ｓ＿２／Ｓ＿１は、 ６≦Ｓ＿２／Ｓ＿１≦８ であることを特徴とする電磁式燃料噴射弁。 （２）前記分流部材の流路は同径の２個の孔の組合せに
より構成されていることを特徴とする特許請求の範囲第
１項記載の電磁式燃料噴射弁。 （３）前記分流部材の流路をなす孔の径がｄで、孔の長
さがＬとした場合、その細長比Ｌ／ｄは１≦Ｌ／ｄ≦２ であることを特徴とする特許請求の範囲第１項または第
２項記載の電磁式燃料噴射弁。 （４）前記噴射孔の出口側と前記分流部材の流路入口と
の間には、隙間が形成されており、この隙間の距離をＭ
とした時、 ０．２ｍｍ≦Ｍ≦１．０ｍｍ であることを特徴とする特許請求の範囲第１項または第
２項または第３項記載の電磁式燃料噴射弁。[Claims] (1) An electromagnetic coil provided inside a housing and a body connected to the housing so as to be slidable and fluctuate by supplying an electric signal to the electromagnetic coil. A needle valve, an injection hole that is formed at the end of the body and injects fuel according to fluctuations in the needle valve, and a fuel flow injected from the injection hole that is provided at the end of the body where the injection hole is formed. The flow path of this flow dividing member is formed at a position corresponding to the injection hole, and the inlet of the fuel flow from the injection hole is located at one of the two circles. The exit center of the injection hole corresponds to the center of the part where the two circles of this inlet overlap each other, and the injection hole is opened at the part corresponding to the exit of the injection hole. The size is large enough to accommodate the opening range of the hole exit, and two holes of a constant diameter are formed at a predetermined angle from the entrance.
The holes are branched within the flow dividing member and open to the external space at two locations at the ends, making the flow path area of the injection hole S_
1. An electromagnetic device characterized in that, when the sum of the flow path areas of two branched holes, which are flow paths of the flow dividing member, is S_2, the area ratio S_2/S_1 is 6≦S_2/S_1≦8. type fuel injection valve. (2) The electromagnetic fuel injection valve according to claim 1, wherein the flow path of the flow dividing member is constituted by a combination of two holes having the same diameter. (3) A patent characterized in that when the diameter of the hole forming the flow path of the flow dividing member is d and the length of the hole is L, the slenderness ratio L/d is 1≦L/d≦2. An electromagnetic fuel injection valve according to claim 1 or 2. (4) A gap is formed between the outlet side of the injection hole and the flow path inlet of the flow dividing member, and the distance of this gap is M
The electromagnetic fuel injection valve according to claim 1, 2, or 3, wherein: 0.2 mm≦M≦1.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60115098A JPH079229B2 (en) | 1985-05-28 | 1985-05-28 | Electromagnetic fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60115098A JPH079229B2 (en) | 1985-05-28 | 1985-05-28 | Electromagnetic fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61272460A true JPS61272460A (en) | 1986-12-02 |
| JPH079229B2 JPH079229B2 (en) | 1995-02-01 |
Family
ID=14654159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60115098A Expired - Lifetime JPH079229B2 (en) | 1985-05-28 | 1985-05-28 | Electromagnetic fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079229B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6282268A (en) * | 1985-10-03 | 1987-04-15 | Nippon Denso Co Ltd | Electromagnetic fuel injection valve |
| JPS62131969A (en) * | 1985-12-02 | 1987-06-15 | Nippon Denso Co Ltd | Fuel injection valve |
| US4778107A (en) * | 1986-08-21 | 1988-10-18 | Nippondenso Co., Ltd. | Fuel injection valve assembly and an assembling method therefor |
| JPH01105766U (en) * | 1987-12-29 | 1989-07-17 | ||
| JPH01105765U (en) * | 1987-12-29 | 1989-07-17 | ||
| JPH02256871A (en) * | 1988-12-28 | 1990-10-17 | Hitachi Ltd | Solenoid type fuel injection valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59569U (en) * | 1982-06-26 | 1984-01-05 | トヨタ自動車株式会社 | Internal combustion engine fuel supply system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59569B2 (en) * | 1977-02-09 | 1984-01-07 | 川崎重工業株式会社 | Converter exhaust gas treatment equipment |
-
1985
- 1985-05-28 JP JP60115098A patent/JPH079229B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59569U (en) * | 1982-06-26 | 1984-01-05 | トヨタ自動車株式会社 | Internal combustion engine fuel supply system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6282268A (en) * | 1985-10-03 | 1987-04-15 | Nippon Denso Co Ltd | Electromagnetic fuel injection valve |
| JPS62131969A (en) * | 1985-12-02 | 1987-06-15 | Nippon Denso Co Ltd | Fuel injection valve |
| US4778107A (en) * | 1986-08-21 | 1988-10-18 | Nippondenso Co., Ltd. | Fuel injection valve assembly and an assembling method therefor |
| JPH01105766U (en) * | 1987-12-29 | 1989-07-17 | ||
| JPH01105765U (en) * | 1987-12-29 | 1989-07-17 | ||
| JPH0639092Y2 (en) * | 1987-12-29 | 1994-10-12 | トヨタ自動車株式会社 | Fuel injection valve for internal combustion engine |
| JPH02256871A (en) * | 1988-12-28 | 1990-10-17 | Hitachi Ltd | Solenoid type fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH079229B2 (en) | 1995-02-01 |
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