JPH07259702A - Electromagnetic fuel injection valve - Google Patents

Electromagnetic fuel injection valve

Info

Publication number
JPH07259702A
JPH07259702A JP5635394A JP5635394A JPH07259702A JP H07259702 A JPH07259702 A JP H07259702A JP 5635394 A JP5635394 A JP 5635394A JP 5635394 A JP5635394 A JP 5635394A JP H07259702 A JPH07259702 A JP H07259702A
Authority
JP
Japan
Prior art keywords
fuel
fuel injection
valve
atomization
section
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.)
Pending
Application number
JP5635394A
Other languages
Japanese (ja)
Inventor
Isamu Sasao
勇 笹尾
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.)
Keihin Corp
Original Assignee
Keihin Seiki Manufacturing 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 Keihin Seiki Manufacturing Co Ltd filed Critical Keihin Seiki Manufacturing Co Ltd
Priority to JP5635394A priority Critical patent/JPH07259702A/en
Publication of JPH07259702A publication Critical patent/JPH07259702A/en
Pending legal-status Critical Current

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  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To prevent fuel from being adhered onto the wall surface of an intake port and the valve stem section of an intake valve in the electromagnetic fuel injection valve injecting fuel into a plurality of intake ports. CONSTITUTION:A pintle 24 provided at the lower end of a needle valve 21 is projected into a fuel atomizing space 23 formed at the lower section of a fuel injection port 163, and fuel which has been finely divided by letting it pass through the fuel injection port 163, and letting it be hit against the pintle 24, is then led to a fuel distributing space 31 having an inclined wall surface 31. Paired fuel atomization guide means 33 are supported at the lower section of a cap 17 via a support arm 171, and fuel injection passages 35 in a horse shoe shape in cross section are formed over the outer circumference of the guide means. Fuel within the fuel distributing space 31 is led to the paired fuel injection passages 35, and it is injected into an intake port while being widely opened into a cone shape having an atomization missing section by means of a divergent atomization forming section 36 provided at the tip end of the aforesaid passages.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、エンジンの吸気ポート
内に燃料を噴射する電磁式燃料噴射弁に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fuel injection valve for injecting fuel into an intake port of an engine.

【0002】[0002]

【従来の技術】かかる電磁式燃料噴射弁であって、キャ
ップの先端に設けた突出部により燃料噴霧パターンを変
化させ或いは修正するものとして、実公昭63−235
80号公報、実公平4−35577号公報に記載された
ものが公知である。また、吸気弁の杆部に対する燃料噴
霧の付着防止を狙ったものとして、特開平2−1049
66号公報に記載されたものが公知である。
2. Description of the Related Art In such an electromagnetic fuel injection valve, a fuel spray pattern is changed or corrected by a protrusion provided at the tip of a cap.
Those disclosed in Japanese Patent No. 80 and Japanese Utility Model Publication No. 4-35577 are known. In addition, Japanese Patent Application Laid-Open No. 2-1049 aims to prevent the fuel spray from adhering to the rod portion of the intake valve.
The one described in Japanese Patent No. 66 is publicly known.

【0003】[0003]

【発明が解決しようとする課題】前記実公昭63−23
580号公報及び実公平4−35577号公報に記載さ
れたものは、燃料噴霧の吸気ポートの壁面に対する付着
を防止することができるが、吸気弁の扞部に対する付着
を防止することができない問題がある。
DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The devices disclosed in Japanese Patent No. 580 and Japanese Utility Model Publication No. 4-35577 can prevent the fuel spray from adhering to the wall surface of the intake port, but cannot prevent the adhering of the fuel spray to the rod portion of the intake valve. is there.

【0004】前記特開平2−104966号公報に記載
されたものは、キャップの先端に突出部を備えていない
ため、吸気弁の扞部を確実に避ける燃料噴霧パターンを
形成するのが難しいという問題がある。
The device disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2-104966 has a problem that it is difficult to form a fuel spray pattern that surely avoids the rod portion of the intake valve because the cap has no protruding portion at its tip. There is.

【0005】本発明は前述の事情に鑑みてなされたもの
で、吸気ポートの壁面や吸気弁の扞部に対する燃料の付
着を確実に防止し得る燃料噴霧パターンを形成すること
を目的とする。
The present invention has been made in view of the above circumstances, and an object of the present invention is to form a fuel spray pattern capable of reliably preventing fuel from adhering to the wall surface of the intake port or the rod portion of the intake valve.

【0006】[0006]

【課題を解決するための手段】前記目的を達成するため
に、本発明の電磁式燃料噴射弁は、インジェクタボディ
に形成されてニードル弁によって開閉される燃料噴射孔
と、インジェクタボディの先端に設けられたキャップ
と、燃料噴射孔の下流側に形成された燃料霧化空間と、
燃料噴射孔を通過した燃料を霧化させるべく前記燃料噴
射孔を貫通して燃料霧化空間内に延びるようにニードル
弁の先端に設けられたピントルと、燃料霧化空間の下流
側に連なるようにキャップ内に形成された燃料分配空間
と、燃料分配空間の下流側にピントルの軸線から偏倚す
るように形成された少なくとも1つの欠如部を有する環
状横断面の複数の燃料噴射通路と、各燃料噴射通路の下
流端内部に設けられて燃料噴霧をコーン状に拡開させる
末広がりの燃料噴霧形成部と、を備えたことを特徴とす
る。
In order to achieve the above object, an electromagnetic fuel injection valve of the present invention is provided with a fuel injection hole formed in an injector body and opened and closed by a needle valve, and a tip end of the injector body. And a fuel atomization space formed on the downstream side of the fuel injection hole,
In order to atomize the fuel that has passed through the fuel injection hole, a pintle provided at the tip of the needle valve so as to penetrate the fuel injection hole and extend into the fuel atomization space is connected to the downstream side of the fuel atomization space. A fuel distribution space formed in the cap, a plurality of fuel injection passages having an annular cross-section having at least one cutout portion formed downstream from the fuel distribution space so as to be offset from the axis of the pintle, and each fuel injection passage. And a fuel spray forming portion that is provided inside the downstream end of the injection passage and that spreads the fuel spray into a cone shape.

【0007】[0007]

【実施例】以下、本発明の実施例を図面を参照して説明
する。
Embodiments of the present invention will be described below with reference to the drawings.

【0008】図1〜図8は本発明の一実施例を示すもの
で、図1は電磁式燃料噴射弁のエンジンへの装着状態を
示す図、図2は図1の2−2線断面図、図3は電磁式燃
料噴射弁の全体側面図、図4は図3の4−4線拡大矢視
図、図5は図4の5−5線断面図、図6は図4の6−6
線断面図、図7は図5の7−7線断面図、図8は図6の
8−8線断面図である。
1 to 8 show an embodiment of the present invention, FIG. 1 is a view showing a mounting state of an electromagnetic fuel injection valve on an engine, and FIG. 2 is a sectional view taken along line 2-2 of FIG. 3 is an overall side view of the electromagnetic fuel injection valve, FIG. 4 is an enlarged arrow view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, and FIG. 6
5 is a sectional view taken along line 7-7 of FIG. 5, and FIG. 8 is a sectional view taken along line 8-8 of FIG.

【0009】図1及び図2に示すように、エンジンのシ
リンダブロック1の上面に結合されたシリンダヘッド2
には二股に分岐した吸気ポート4i,4i及び二股に分
岐した排気ポート4e,4eが燃焼室3に連なるように
形成されており、これら吸気ポート4i,4i及び排気
ポート4e,4eにそれぞれ連なる吸気マニホールド5
i及び排気マニホールド5eがシリンダヘッド2の側面
に結合される。一対の吸気弁6i,6iは杆部6i1
6i1 及び傘部6i2 ,6i2 を備えており、シリンダ
ヘッド2に設けた弁ガイド7i,7iに杆部6i1 ,6
1 を摺動自在に案内された前記吸気弁6i,6iが図
示せぬ動弁機構によって上下動することにより、傘部6
2 ,6i2 が弁座8i,8iに対して着座及び離間し
て吸気弁孔9i,9iを開閉する。また一対の排気弁6
e,6eは杆部6e1 ,6e1 及び傘部6e2 ,6e2
を備えており、シリンダヘッド2に設けた弁ガイド7
e,7eに杆部6e1 ,6e1 を摺動自在に案内された
前記排気弁6e,6eが図示せぬ動弁機構によって上下
動することにより、傘部6e2 ,6e2 が弁座8e,8
eに対して着座及び離間して排気弁孔9e,9eを開閉
する。吸気マニホールド5iには単一の電磁式燃料噴射
弁Iが設けられており、この電磁式燃料噴射弁Iから二
股に噴射された燃料が吸気ポート4i,4iを通して吸
気弁孔9i,9iに供給される。
As shown in FIGS. 1 and 2, a cylinder head 2 connected to the upper surface of a cylinder block 1 of an engine.
Is formed with a bifurcated intake port 4i, 4i and a bifurcated exhaust port 4e, 4e connected to the combustion chamber 3. The intake ports 4i, 4i and the exhaust ports 4e, 4e are connected to the intake ports 4i, 4e, respectively. Manifold 5
i and the exhaust manifold 5e are connected to the side surface of the cylinder head 2. The pair of intake valves 6i, 6i includes a rod portion 6i 1 ,
6i 1 and umbrellas 6i 2 and 6i 2 are provided, and the rod guides 6i 1 and 6 are attached to the valve guides 7i and 7i provided on the cylinder head 2.
When the intake valves 6i, 6i slidably guided by i 1 move up and down by a valve mechanism (not shown), the umbrella portion 6
i 2 and 6i 2 are seated on and away from the valve seats 8i and 8i to open and close the intake valve holes 9i and 9i. Also, a pair of exhaust valves 6
e and 6e are rod portions 6e 1 and 6e 1 and umbrella portions 6e 2 and 6e 2
And a valve guide 7 provided on the cylinder head 2.
The exhaust valves 6e, 6e, which are slidably guided by the rods 6e 1 , 6e 1 by e, 7e, move up and down by a valve mechanism (not shown), so that the umbrellas 6e 2 , 6e 2 move to the valve seat 8e. , 8
The exhaust valve holes 9e and 9e are opened and closed by being seated on and away from e. The intake manifold 5i is provided with a single electromagnetic fuel injection valve I, and the fuel bifurcated from the electromagnetic fuel injection valve I is supplied to the intake valve holes 9i, 9i through the intake ports 4i, 4i. It

【0010】図3に示すように、電磁式燃料噴射弁Iは
概略円筒状の本体ハウジング11を備える。本体ハウジ
ング11の内部には、外周にコイル12を巻装したボビ
ン13、ヨーク14、ストッパ板15、インジェクタボ
ディ16及びキャップ17が下方から順次嵌合し、本体
ハウジング11の下縁をキャップ17の外周にカシメる
ことにより固定される。ボビン13の内側に位置する本
体ハウジング11の一部は固定鉄心111 を構成し、ま
たコイル12の外側に位置する本体ハウジング11の一
部はヨーク112 を構成する。ボビン13の下部内周と
ヨーク14の内周とにより画成される空間には可動鉄心
18が上下動可能に収納される。本体ハウジング11の
中心には管状のスプリング座19が上方から圧入されて
おり、このスプリング座19との間に縮設したバルブス
プリング20によって可動鉄心18は下方に付勢され
る。
As shown in FIG. 3, the electromagnetic fuel injection valve I is provided with a substantially cylindrical main body housing 11. Inside the main body housing 11, a bobbin 13 having a coil 12 wound around the outer periphery thereof, a yoke 14, a stopper plate 15, an injector body 16 and a cap 17 are sequentially fitted from below, and the lower edge of the main body housing 11 is attached to the cap 17. It is fixed by crimping on the outer circumference. A part of the main body housing 11 located inside the bobbin 13 constitutes a fixed iron core 11 1, and a part of the main body housing 11 located outside the coil 12 constitutes a yoke 11 2 . A movable iron core 18 is vertically movably housed in a space defined by the lower inner circumference of the bobbin 13 and the inner circumference of the yoke 14. A tubular spring seat 19 is press-fitted into the center of the main body housing 11 from above, and a movable spring 18 is biased downward by a valve spring 20 that is compressed between the tubular spring seat 19 and the spring seat 19.

【0011】図5及び図6を併せて参照すると明らかな
ように、可動鉄心18にカシメにより固定されたニード
ル弁21は下方に延び、その略四角断面に形成された一
対のガイド部211 ,211 がインジェクタボディ16
の円形断面のガイド孔161に摺動自在に嵌合する。ニ
ードル弁21の下部に形成した弁部212 は、前記ガイ
ド孔161 の下部に連設した弁座162 に着座可能であ
る。而して、前記弁部212 及び弁座162 によって環
状の燃料噴射孔163 が開閉される。
As is apparent from the combination of FIGS. 5 and 6, the needle valve 21 fixed by caulking to the movable iron core 18 extends downward and has a pair of guide portions 21 1 formed in a substantially rectangular cross section. 21 1 is the injector body 16
Is slidably fitted in the guide hole 16 1 having a circular cross section. The valve portion 21 2 formed at the lower portion of the needle valve 21 can be seated on the valve seat 16 2 that is continuously provided at the lower portion of the guide hole 16 1 . Thus, the annular fuel injection hole 16 3 is opened and closed by the valve portion 21 2 and the valve seat 16 2 .

【0012】ボビン13に巻装したコイル12を消磁し
た状態では、バルブスプリング20の弾発力で可動鉄心
18及びニードル弁21が下方に付勢され、弁部212
が弁座162 に着座する。また、コイル12を励磁して
可動鉄心18をバルブスプリング20に抗して上方に吸
引すると、ニードル弁21が上動して弁部212 が弁座
162 から離間する。図3、図5及び図6はニードル弁
21が上動して弁部212 が弁座162 から離間し、燃
料噴射孔163 が開放された状態を示している。このと
き、ニードル弁21の中間部に形成したフランジ213
がストッパ板15の下面に当接することにより、ニード
ル弁21のストロークを規制する。
When the coil 12 wound around the bobbin 13 is demagnetized, the movable iron core 18 and the needle valve 21 are urged downward by the elastic force of the valve spring 20, and the valve portion 21 2
Seats on the valve seat 16 2 . When the coil 12 is excited and the movable iron core 18 is attracted upward against the valve spring 20, the needle valve 21 moves upward and the valve portion 21 2 separates from the valve seat 16 2 . 3, 5, and 6 show a state in which the needle valve 21 moves upward, the valve portion 21 2 is separated from the valve seat 16 2 , and the fuel injection hole 16 3 is opened. At this time, the flange 21 3 formed in the middle of the needle valve 21
Is contacted with the lower surface of the stopper plate 15 to regulate the stroke of the needle valve 21.

【0013】上述のようにして燃料噴射孔163 が開放
されると、図示せぬ燃料供給源から本体ハウジング11
の上端に供給された燃料が、フィルタ22、スプリング
座19の内部空間、可動鉄心18の通孔181 、ヨーク
14の内部空間、ストッパ板15の通孔151 、インジ
ェクタボディ16のガイド孔161 とニードル弁21の
ガイド部211 ,211 との間隙、弁部212 と弁座1
2 との間隙及び燃料噴射孔163 を通過して燃料霧化
空間23内に噴射される。このとき、電磁式燃料噴射弁
Iからの燃料噴射量は、コイル12に通電する時間の長
さを制御することにより計量される。
When the fuel injection hole 16 3 is opened as described above, the main body housing 11 comes from a fuel supply source (not shown).
Is supplied to the upper end of the filter 22, the internal space of the spring seat 19, the through hole 18 1 of the movable iron core 18, the internal space of the yoke 14, the through hole 15 1 of the stopper plate 15, the guide hole 16 of the injector body 16. 1 , the gap between the guide portions 21 1 and 21 1 of the needle valve 21, the valve portion 21 2 and the valve seat 1
The fuel is injected into the fuel atomization space 23 through the gap with 6 2 and the fuel injection hole 16 3 . At this time, the amount of fuel injected from the electromagnetic fuel injection valve I is measured by controlling the length of time that the coil 12 is energized.

【0014】ニードル弁21の下端には、燃料噴射孔1
3 を貫通して燃料霧化空間23内に延びるピントル2
4が一体に形成される。ピントル24の下端には上向き
テーパ面を有する傘部241 が形成される。
At the lower end of the needle valve 21, the fuel injection hole 1
Pintle 2 penetrating 6 3 and extending into the fuel atomization space 23
4 are integrally formed. An umbrella portion 24 1 having an upward tapered surface is formed at the lower end of the pintle 24.

【0015】図4〜図7に示すように、キャップ17の
内部にはインジェクタボディ16の燃料霧化空間23の
下方に連なるように燃料分配空間31が形成される。燃
料分配空間31の下壁を構成する傾斜壁面32は、その
上端から下端に向けてニードル弁21の軸線Lを一方か
ら他方に横切るように傾斜し、且つ左右方向の幅が広が
るように形成される。ニードル弁21の軸線Lの一側、
即ち傾斜壁面32の下端側には、左右一対の燃料噴霧ガ
イド手段33,33がキャップ17の内壁面から一体に
突設される。一対の燃料噴霧ガイド手段33,33は、
二股に分岐する吸気ポート4i,4iの分岐角度に応じ
て、それらの下端側が左右に拡開するように形成され
る。
As shown in FIGS. 4 to 7, a fuel distribution space 31 is formed inside the cap 17 so as to extend below the fuel atomization space 23 of the injector body 16. The inclined wall surface 32 that constitutes the lower wall of the fuel distribution space 31 is formed so as to incline from the upper end to the lower end so as to cross the axis L of the needle valve 21 from one to the other, and to widen the width in the left-right direction. It One side of the axis L of the needle valve 21,
That is, on the lower end side of the inclined wall surface 32, a pair of left and right fuel spray guide means 33, 33 are integrally projected from the inner wall surface of the cap 17. The pair of fuel spray guide means 33, 33,
The lower ends of the intake ports 4i, 4i that are bifurcated are formed so as to widen left and right.

【0016】各燃料噴霧ガイド手段33の上半部の横断
面は円形断面であって、キャップ17の内壁面から完全
に分離されている。一方、各燃料噴霧ガイド手段33の
下半部はキャップ17の内壁面に支持腕171 によって
接続されており、しかも支持腕171 を除く部分におい
て傾斜壁面32の下部に連なるガイド壁面34によって
囲まれることにより、横断面が馬蹄形の燃料噴射通路3
5が形成される。
The cross section of the upper half of each fuel spray guide means 33 has a circular cross section and is completely separated from the inner wall surface of the cap 17. On the other hand, the lower half part of each fuel spray guide means 33 is connected to the inner wall surface of the cap 17 by a support arm 17 1 , and is surrounded by a guide wall surface 34 which is continuous with the lower part of the inclined wall surface 32 except the support arm 17 1. As a result, the fuel injection passage 3 has a horseshoe-shaped cross section.
5 is formed.

【0017】燃料噴霧ガイド手段33の下端には、キャ
ップ17の下面から下方に突出するように燃料噴霧形成
部36が形成される。燃料噴霧形成部36の横断面形状
は下流側が拡開するようにテーパしており、これにより
燃料噴射通路35を通過した燃料は噴霧内側角度θ1
び噴霧外側角度θ2 を有する正確なコーン状に拡開す
る。図8から明らかなように、燃料噴霧ガイド手段33
の支持腕171 によって燃料噴霧が遮られることによ
り、燃料噴霧パターンは噴霧欠如部aを有する馬蹄形と
なる。
At the lower end of the fuel spray guide means 33, a fuel spray forming portion 36 is formed so as to project downward from the lower surface of the cap 17. The cross-sectional shape of the fuel spray forming portion 36 is tapered so that the downstream side expands, so that the fuel that has passed through the fuel injection passage 35 has an accurate cone shape having an inner spray angle θ 1 and an outer spray angle θ 2. Expand to. As is apparent from FIG. 8, the fuel spray guide means 33
Since the fuel spray is blocked by the support arm 17 1 of the above, the fuel spray pattern becomes a horseshoe shape having the spray lacking part a.

【0018】キャップ17の側壁から横方向に延びる一
対のエアーアシスト通路172 ,172 は、燃料噴霧ガ
イド手段33,33の上半部の背面(ニードル弁16の
軸線Lから遠い側)に開口するエアー噴出口173 ,1
3 を備える。図示せぬエアー供給源からエアーアシス
ト通路172 ,172 に供給されたエアーはエアー噴出
口173 ,173 から噴出し、燃料噴霧ガイド手段3
3,33の外周を迂回して燃料分配空間31に供給され
る。
The pair of air assist passages 17 2 and 17 2 extending laterally from the side wall of the cap 17 are opened on the back surface of the upper half of the fuel spray guide means 33 and 33 (the side far from the axis L of the needle valve 16). Air outlet 17 3 , 1
7 3 is provided. The air supplied from the air supply source (not shown) to the air assist passages 17 2 and 17 2 is ejected from the air ejection ports 17 3 and 17 3 , and the fuel spray guide means 3
The fuel is supplied to the fuel distribution space 31 by bypassing the outer circumferences of 3, 33.

【0019】次に、前述の構成を備えた本発明の実施例
の作用について説明する。
Next, the operation of the embodiment of the present invention having the above construction will be described.

【0020】電磁式燃料噴射弁Iのコイル12を励磁し
てニードル弁21を上動させると、ニードル弁21の弁
部212 がインジェクタボディ16の弁座162 から離
間して燃料噴射孔163 が開放することにより、高圧の
燃料が燃料噴射孔163 を通過して燃料霧化空間23内
に噴射される。燃料霧化空間23内に噴射された燃料
は、ピントル24の傘部241 に衝突して放射状に拡散
しながら微粒化する。
When the coil 12 of the electromagnetic fuel injection valve I is excited to move the needle valve 21 upward, the valve portion 21 2 of the needle valve 21 separates from the valve seat 16 2 of the injector body 16 and the fuel injection hole 16 When 3 is opened, high-pressure fuel passes through the fuel injection hole 16 3 and is injected into the fuel atomization space 23. The fuel injected into the fuel atomization space 23 collides with the umbrella portion 24 1 of the pintle 24 and is atomized while radially spreading.

【0021】微粒化した燃料は燃料霧化空間23から燃
料分配空間31に流入し、そこで傾斜壁面32に衝突し
て微粒化を促進されながら一対の燃料噴霧ガイド手段3
3,33に向かって方向を変える。このように、ピント
ル24によって予め微粒化した燃料が傾斜壁面32によ
って一対の燃料噴霧ガイド手段33,33に分配される
ので、ピントル24と一対の燃料噴霧ガイド手段33,
33との相対位置関係に多少の加工誤差があっても、燃
料を両燃料噴霧ガイド手段33,33に略均等に分配す
ることができる。
The atomized fuel flows from the fuel atomization space 23 into the fuel distribution space 31, where it collides with the inclined wall surface 32 to promote atomization, and the pair of fuel spray guide means 3
Change direction to 3, 33. In this way, the fuel atomized in advance by the pintle 24 is distributed to the pair of fuel spray guide means 33, 33 by the inclined wall surface 32, so that the pintle 24 and the pair of fuel spray guide means 33, 33.
Even if there is some processing error in the relative positional relationship with 33, the fuel can be distributed to both fuel spray guide means 33, 33 substantially evenly.

【0022】一対の燃料噴霧ガイド手段33,33に向
かった燃料は、エアー噴出口173,173 から噴出し
て燃料分配空間31に流入したエアーと衝突して均一に
混合し、これにより燃料の微粒化と粒径の均一化が促進
される。このとき、エアー噴出口173 ,173 が燃料
噴霧ガイド手段33,33に対向しており、しかもエア
ー噴出口173 ,173 とピントル24との間に燃料噴
霧ガイド手段33,33が介在しているため、何らかの
理由でエアーの供給が停止した場合であっても、エアー
噴出口173 ,173 からエアーアシスト通路172
172 内に燃料噴霧が侵入することがなく、燃料の全量
を燃料噴射通路35,35に供給することができる。
The fuel directed to the pair of fuel spray guide means 33, 33 collides with the air jetted from the air jet outlets 17 3 , 17 3 and flowing into the fuel distribution space 31 to be uniformly mixed, whereby the fuel is produced. The atomization and homogenization of the particle size are promoted. At this time, the air jets 17 3 and 17 3 face the fuel spray guide means 33 and 33, and the fuel spray guide means 33 and 33 are interposed between the air jets 17 3 and 17 3 and the pintle 24. because you are, even if you stop air supply for any reason, the air ejection port 17 3, 17 3 air assist passage 17 from 2,
It is possible to supply the entire amount of fuel to the fuel injection passages 35, 35 without the fuel spray entering the 17 2 .

【0023】而して、エアーによって微粒化を促進され
た燃料は横断面が馬蹄形の燃料噴射通路35,35から
噴出し、その際に燃料噴霧ガイド手段33,33の燃料
噴霧形成部36,36によってコーン状に拡開するとと
もに、その一部が支持腕17 1 ,171 に遮られて図8
に示す噴霧欠如部a,aが形成される。
Thus, the atomization is promoted by the air.
The fuel from the fuel injection passages 35, 35 having a horseshoe-shaped cross section
Ejection, at which time fuel of the fuel spray guide means 33, 33
When the spray forming parts 36, 36 expand the cone shape
The part of the support arm 17 1, 171Blocked by Fig. 8
The spray lacking portions a and a shown in are formed.

【0024】上述のようにして微粒化された燃料は、二
股に分岐した吸気ポート4i,4iを通って吸気弁孔9
i,9i及び吸気弁6i,6iの傘部6i2 ,6i2
に形成された隙間に向けて噴霧される。このとき、燃料
噴霧パターンの噴霧欠如部a,aが吸気弁6i,6iの
杆部6i1 ,6i1 の位置に対応しているので、噴霧が
杆部6i1 ,6i1 に衝突して付着するのを回避し、空
燃比の変動を効果的に防止することが可能となる。
The fuel atomized as described above passes through the bifurcated intake ports 4i, 4i and the intake valve hole 9 is formed.
i, 9i and the intake valves 6i, 6i are sprayed toward the gap formed between the umbrella portions 6i 2 , 6i 2 . At this time, since the spray-missing portions a and a of the fuel spray pattern correspond to the positions of the rod portions 6i 1 and 6i 1 of the intake valves 6i and 6i, the spray collides with the rod portions 6i 1 and 6i 1 and adheres thereto. It is possible to avoid this and effectively prevent fluctuations in the air-fuel ratio.

【0025】また、燃料噴霧ガイド手段33,33の形
状(即ち、キャップ17の形状)を変更するだけで、燃
料噴霧パターンを任意に設定することが可能になるた
め、低コストで汎用性が高い電磁式燃料噴射弁Iを提供
することができる。
Further, since the fuel spray pattern can be arbitrarily set only by changing the shape of the fuel spray guide means 33, 33 (that is, the shape of the cap 17), the cost is low and the versatility is high. An electromagnetic fuel injection valve I can be provided.

【0026】以上、本発明の実施例を詳述したが、本発
明は前記実施例に限定されるものでなく、種々の設計変
更を行うことができる。
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made.

【0027】例えば、実施例では燃料噴霧パターンの噴
霧欠如部a,aを吸気弁6i,6iの杆部6i1 ,6i
1 に対応させているが、それを燃料が付着し易い吸気ポ
ート4i,4iの所定部位に対応させても良い。また、
各燃料噴霧ガイド手段33をそれぞれ一対の支持腕17
1 ,171 で支持することにより、図9に示すような互
いに対向する一対の噴霧欠如部a,aを有する燃料噴霧
パターンを形成することができ、これら一対の噴霧欠如
部a,aを吸気ポート4i内の燃料が付着し易い2つの
部位に対応させることができる。また、実施例では電磁
式燃料噴射弁Iで燃料を二股に分岐させているが三股以
上に分岐させることも可能である。
For example, in the embodiment, the spray missing portions a, a of the fuel spray pattern are connected to the rod portions 6i 1 , 6i of the intake valves 6i, 6i.
Although it is made to correspond to 1 , it may be made to correspond to a predetermined portion of the intake ports 4i, 4i to which fuel easily adheres. Also,
Each fuel spray guide means 33 is connected to a pair of support arms 17 respectively.
By being supported by 1 , 17 1 , it is possible to form a fuel spray pattern having a pair of spray lacking portions a, a facing each other as shown in FIG. It is possible to correspond to the two sites in the port 4i where fuel is likely to adhere. Further, in the embodiment, the fuel is branched into two forks by the electromagnetic fuel injection valve I, but it is also possible to branch into three or more forks.

【0028】[0028]

【発明の効果】以上のように、本発明によれば、燃料噴
射孔を通過した燃料をピントルに衝突させることにより
効果的に微粒化することができる。また、微粒化した燃
料が導かれる複数の燃料噴射通路が欠如部を有する環状
横断面に形成されているので、燃料噴霧パターンに噴霧
欠如部を形成して吸気バルブの扞部等に対する燃料の付
着を防止することができ、しかも各燃料噴射通路の下流
端内部に末広がりの燃料噴霧形成部を設けたことによ
り、燃料噴霧パターンを正確なコーン状に拡開させて吸
気ポートの壁面に対する燃料の付着を防止することがで
きる。更に、ピントルを備えた従来の電磁式燃料噴射弁
に燃料噴射通路及び燃料噴霧形成部を付加するだけで良
いため、極めて低コストで実現することが可能である。
As described above, according to the present invention, the fuel passing through the fuel injection hole can be atomized effectively by colliding with the pintle. Further, since the plurality of fuel injection passages through which the atomized fuel is guided are formed in the annular cross section having the lacked portion, the fuel lacking portion is formed in the fuel spray pattern to attach the fuel to the rod portion of the intake valve. In addition, the fuel spray formation part that spreads toward the inside of the downstream end of each fuel injection passage prevents the fuel spray pattern from expanding into an accurate cone shape, and the fuel adheres to the wall surface of the intake port. Can be prevented. Further, since it is only necessary to add the fuel injection passage and the fuel spray forming portion to the conventional electromagnetic fuel injection valve having the pintle, it is possible to realize at an extremely low cost.

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

【図1】電磁式燃料噴射弁のエンジンへの装着状態を示
す図
FIG. 1 is a view showing how an electromagnetic fuel injection valve is attached to an engine.

【図2】図1の2−2線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.

【図3】電磁式燃料噴射弁の全体側面図FIG. 3 is an overall side view of an electromagnetic fuel injection valve

【図4】図3の4−4線拡大矢視図FIG. 4 is an enlarged arrow view of line 4-4 of FIG.

【図5】図4の5−5線断面図5 is a sectional view taken along line 5-5 of FIG.

【図6】図4の6−6線断面図6 is a sectional view taken along line 6-6 of FIG.

【図7】図5の7−7線断面図7 is a sectional view taken along line 7-7 of FIG.

【図8】図6の8−8線断面図8 is a sectional view taken along line 8-8 of FIG.

【図9】燃料噴霧パターンの他の実施例を示す図FIG. 9 is a diagram showing another embodiment of the fuel spray pattern.

【符号の説明】[Explanation of symbols]

16 インジェクタボディ 163 燃料噴射孔 17 キャップ 171 支持腕(欠如部) 21 ニードル弁 23 燃料霧化空間 24 ピントル 31 燃料分配空間 35 燃料噴射通路 36 燃料噴霧形成部16 injector body 16 3 fuel injection hole 17 cap 17 1 support arm (missing part) 21 needle valve 23 fuel atomization space 24 pintle 31 fuel distribution space 35 fuel injection passage 36 fuel spray forming part

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 インジェクタボディ(16)に形成され
てニードル弁(21)によって開閉される燃料噴射孔
(163 )と、 インジェクタボディ(16)の先端に設けられたキャッ
プ(17)と、 燃料噴射孔(163 )の下流側に形成された燃料霧化空
間(23)と、 燃料噴射孔(163 )を通過した燃料を霧化させるべく
前記燃料噴射孔(16 3 )を貫通して燃料霧化空間(2
3)内に延びるようにニードル弁(21)の先端に設け
られたピントル(24)と、 燃料霧化空間(23)の下流側に連なるようにキャップ
(17)内に形成された燃料分配空間(31)と、 燃料分配空間(31)の下流側にピントル(24)の軸
線から偏倚するように形成された少なくとも1つの欠如
部(171 )を有する環状横断面の複数の燃料噴射通路
(35)と、 各燃料噴射通路(35)の下流端内部に設けられて燃料
噴霧をコーン状に拡開させる末広がりの燃料噴霧形成部
(36)と、を備えたことを特徴とする電磁式燃料噴射
弁。
1. Formed on an injector body (16)
Fuel injection hole opened and closed by the needle valve (21)
(163) And a cap provided on the tip of the injector body (16).
The fuel injection hole (16)3) Fuel atomization sky formed on the downstream side of
And the fuel injection hole (163) To atomize the fuel that has passed
The fuel injection hole (16 3) Through the fuel atomization space (2
3) Provided at the tip of the needle valve (21) so as to extend inside.
The pintle (24) and the cap that is connected to the downstream side of the fuel atomization space (23)
A fuel distribution space (31) formed in (17), and a shaft of a pintle (24) downstream of the fuel distribution space (31).
At least one defect formed to deviate from the line
Division (171Fuel injection passages of annular cross section with
(35) and the fuel provided inside the downstream end of each fuel injection passageway (35).
A fuel spray forming part that expands the spray into a cone shape
(36), and an electromagnetic fuel injection characterized by comprising:
valve.
JP5635394A 1994-03-25 1994-03-25 Electromagnetic fuel injection valve Pending JPH07259702A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5635394A JPH07259702A (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5635394A JPH07259702A (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve

Publications (1)

Publication Number Publication Date
JPH07259702A true JPH07259702A (en) 1995-10-09

Family

ID=13024878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5635394A Pending JPH07259702A (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve

Country Status (1)

Country Link
JP (1) JPH07259702A (en)

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