JPH07259699A - Electromagnetic type fuel injection valve - Google Patents

Electromagnetic type fuel injection valve

Info

Publication number
JPH07259699A
JPH07259699A JP5635194A JP5635194A JPH07259699A JP H07259699 A JPH07259699 A JP H07259699A JP 5635194 A JP5635194 A JP 5635194A JP 5635194 A JP5635194 A JP 5635194A JP H07259699 A JPH07259699 A JP H07259699A
Authority
JP
Japan
Prior art keywords
fuel
fuel injection
guide means
valve
pintle
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
Application number
JP5635194A
Other languages
Japanese (ja)
Other versions
JP2599692B2 (en
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 JP5635194A priority Critical patent/JP2599692B2/en
Priority to EP94308896A priority patent/EP0678667B1/en
Priority to DE69412453T priority patent/DE69412453T2/en
Priority to US08/352,095 priority patent/US5540388A/en
Publication of JPH07259699A publication Critical patent/JPH07259699A/en
Application granted granted Critical
Publication of JP2599692B2 publication Critical patent/JP2599692B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To atomize and uniformize injection fuel, and stabilize a particle diameter, in an electromagnetic type fuel injection valve. CONSTITUTION:An outside fuel atomization guide means 31 and an inside fuel atomization guide means 32 are coaxially arranged on the downstream side of a fuel injection hole 163, a pintle 34 which is protruded on the bottom end of a needle valve 21 is made to penetrate a fuel injection hole 163, and it is faced to the top surface of the inside fuel atomization guide means 32. Fuel which is passed through the fuel injection hole 163 and which collides with the umbrella part 343 of the pintle 34, is atomized, and it is sprayed in an intake port while expanding in a corn shape. At this time, atomization and uniformization of fuel, and stabilization of a particle diameter are promoted by air injected from an air assist passage 173 which is provided on the inside fuel atomization guide means 32 toward the umbrella part 343 of the pintle 34.

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として、実開平
1−61461号公報、実開昭59−131575号公
報、実開昭61−187963号公報、実開昭62−1
01067号公報に記載されたものが公知である。
2. Description of the Related Art As such an electromagnetic fuel injection valve, Japanese Utility Model Laid-Open Publication No. 1-61461, Japanese Utility Model Publication No. 59-131575, Japanese Utility Model Publication No. 61-187963, and Japanese Utility Model Publication No. 62-1.
The one described in JP-A-01067 is known.

【0003】[0003]

【発明が解決しようとする課題】前記実開平1−614
61号公報に記載されたものは、2個の燃料噴射通路の
各々にエアーアシスト通路を開口させて燃料の微粒化を
促進している。しかしながら、このものは燃料の吐出量
の増減及びエアーの供給量の増減によって燃料とエアー
との混合や微粒化が不均一になり、燃料の粒径にバラツ
キが生じる問題がある。
DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the device disclosed in Japanese Patent No. 61, an air assist passage is opened in each of the two fuel injection passages to promote atomization of fuel. However, there is a problem in that the fuel and air are mixed and atomized unevenly due to the increase and decrease of the fuel discharge amount and the air supply amount, and the particle size of the fuel varies.

【0004】前記実開昭59−131575号公報及び
実開昭61−187963号公報に記載されたものは、
燃料とエアーとの混合を均一化するために各燃料噴射通
路に対して複数のエアーアシスト通路を開口させてお
り、また前記実開昭62−101067号公報に記載さ
れたものは各燃料噴射通路を形成する部材をオープンセ
ル状多孔質材料で形成し、前記燃料噴射通路の全周から
エアーを噴出させている。しかしながら、これらのもの
は加工コストが嵩むうえに、燃料とエアーとの混合や微
粒化或いは指向性にバラツキが生じる問題がある。
Those described in Japanese Utility Model Publication No. 59-131575 and Japanese Utility Model Publication No. 61-187963 are:
A plurality of air assist passages are opened for each fuel injection passage in order to make the mixture of fuel and air uniform, and the fuel injection passage described in Japanese Utility Model Laid-Open No. 62-101067 is used. Is formed of an open cell porous material, and air is jetted from the entire circumference of the fuel injection passage. However, these materials have problems that the processing cost is high and that the mixing of fuel and air, atomization, or variation in directivity occurs.

【0005】本発明は前述の事情に鑑みてなされたもの
で、電磁式燃料噴射弁において噴射燃料の微粒化、均一
化及び粒径の安定化を図ることを目的とする。
The present invention has been made in view of the above circumstances, and it is an object of the present invention to achieve atomization, homogenization and stabilization of the particle size of injected fuel in an electromagnetic fuel injection 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、燃料噴射孔の下流側に設けられて燃料の噴霧角度を
規制する筒状の燃料噴霧ガイド手段と、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
燃料噴霧ガイド手段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、ピントルの下流側の燃料噴霧
ガイド手段内に配置されて前記ピントルの先端に同軸に
対向するエアーアシスト通路と、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 comprises a fuel injection hole formed in an injector body and opened / closed by a needle valve, and a downstream side of the fuel injection hole. A cylindrical fuel spray guide means for regulating the spray angle of the fuel, and a needle extending through the fuel injection hole to extend into the fuel spray guide means for atomizing the fuel that has passed through the fuel injection hole. It is characterized by comprising a pintle provided at the tip of the valve and an air assist passage arranged in the fuel spray guide means on the downstream side of the pintle and coaxially opposed to the tip of the pintle.

【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6は本発明の第1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は電磁式燃料噴射弁の全体側面図、図3
は図2の要部拡大図、図4は図3の4−4線断面図、図
5は図3の5−5線矢視図、図6は図3の6−6線断面
図である。
1 to 6 show a first 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 an overall side view of the electromagnetic fuel injection valve. Figure, Figure 3
2 is an enlarged view of a main part of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 of FIG. .

【0009】図1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には燃焼
室3に連なる吸気ポート4が形成されており、この吸気
ポート4に連なる吸気マニホールド5がシリンダヘッド
2の側面に結合される。吸気弁6は杆部61 及び傘部6
2 を備えており、シリンダヘッド2に設けた弁ガイド7
に杆部61 を摺動自在に案内された吸気弁6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62 が弁
座8に対して着座及び離間して吸気弁孔9を開閉する。
吸気マニホールド5には電磁式燃料噴射弁Iが設けられ
ており、この電磁式燃料噴射弁Iから燃料が吸気ポート
4を通して吸気弁孔9に噴射される。
As shown in FIG. 1, an intake port 4 connected to a combustion chamber 3 is formed in a cylinder head 2 connected to an upper surface of a cylinder block 1 of an engine, and an intake manifold 5 connected to the intake port 4 is formed. It is connected to the side surface of the cylinder head 2. The intake valve 6 includes a rod portion 6 1 and an umbrella portion 6
2 equipped with a valve guide 7 provided on the cylinder head 2.
The intake valve 6 slidably guided in the rod portion 6 1 moves up and down by a valve mechanism (not shown), so that the umbrella portion 6 2 is seated on and away from the valve seat 8 and the intake valve hole 9 Open and close.
The intake manifold 5 is provided with an electromagnetic fuel injection valve I, and fuel is injected from the electromagnetic fuel injection valve I into the intake valve hole 9 through the intake port 4.

【0010】図2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. 2, 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3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16
1 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 can be seen by referring to FIG. 3 together,
Needle valve 21 fixed by caulking to movable iron core 18
Extends downward, and a pair of guide portions 21 1 , 21 1 formed in a substantially rectangular cross section thereof are slidably fitted in the guide holes 16 1 of the circular cross section of the injector body 16. The valve portion 21 2 formed in the lower portion of the needle valve 21, the guide hole 16
It can be seated on a valve seat 16 2 that is connected to the lower part of 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2及び図3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2
1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 . 2 and 3 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 at the intermediate portion of the needle valve 21 comes into contact with the lower surface of the stopper plate 15 so that the needle valve 2
1 stroke is regulated.

【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 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】図3〜図5に示すように、インジェクタボ
ディ16の下端に連なるキャップ17に形成された切欠
き171 には、ニードル弁21と同軸に位置するように
筒状外側燃料噴霧ガイド手段31が嵌合保持される。ま
たキャップ17の下端には前記切欠き171 を仕切るよ
うに直径方向に延びる一対の支持腕172 ,172 が形
成されており、これら一対の支持腕172 ,172 によ
って紡錘形の内側燃料噴霧ガイド手段32が保持され
る。外側燃料噴霧ガイド手段31の下端に形成した一対
の切欠き311 ,311 は内側燃料噴霧ガイド手段32
の一対の支持腕172 ,172 に嵌合しており、これに
より外側燃料噴霧ガイド手段31は内側燃料噴霧ガイド
手段32と同軸に配設されるとともに、外側燃料噴霧ガ
イド手段31の内周と内側燃料噴霧ガイド手段32の外
周との間に互いに対向する一対の三日月状のノズル3
3,33が形成される。
As shown in FIGS. 3 to 5, the notch 17 1 formed in the cap 17 connected to the lower end of the injector body 16 has a cylindrical outer fuel spray guide means so as to be positioned coaxially with the needle valve 21. 31 is fitted and held. A pair of support arms 17 2 and 17 2 extending in the diametrical direction is formed at the lower end of the cap 17 so as to partition the notch 17 1 , and the spindle-shaped inner fuel is formed by the pair of support arms 17 2 and 17 2 . The spray guide means 32 is held. The pair of notches 31 1 and 31 1 formed at the lower end of the outer fuel spray guide means 31 are inner fuel spray guide means 32.
Are fitted to the pair of support arms 17 2 and 17 2 so that the outer fuel spray guide means 31 is disposed coaxially with the inner fuel spray guide means 32, and the inner circumference of the outer fuel spray guide means 31 is And a pair of crescent-shaped nozzles 3 facing each other between the inner fuel spray guide means 32 and the outer circumference of the inner fuel spray guide means 32.
3, 33 are formed.

【0015】ニードル弁21の下端に一体に形成された
ピントル34は外側燃料噴霧ガイド手段31の内部を下
向きに延び、その下端に上向きテーパ面341 と下向き
テーパ面342 とを有する傘部343 が形成される。従
って、燃料噴射孔163 を通過した燃料はピントル34
の傘部343 に衝突して微粒化し、噴霧内側角度θ1
有し且つ噴霧外側角度θ2 を有するコーン状に拡開す
る。
A pintle 34 integrally formed at the lower end of the needle valve 21 extends downward inside the outer fuel spray guide means 31 and has an umbrella portion 34 having an upward taper surface 34 1 and a downward taper surface 34 2 at its lower end. 3 is formed. Therefore, the fuel that has passed through the fuel injection hole 16 3 is
It collides with the umbrella portion 34 3 and atomizes and spreads into a cone shape having an inner spray angle θ 1 and an outer spray angle θ 2 .

【0016】キャップ17には、その外周面から一方の
支持腕172 の内部を内側燃料噴霧ガイド手段32の中
心まで半径方向内側に延び、そこから上方に延びて内側
燃料噴霧ガイド手段32の中心上面に開口するエアーア
シスト通路173 が穿設される。エアーアシスト通路1
3 の開口はピントル34の傘部343 の先端(即ち、
下向きテーパ面342 の先端)に同軸に対向する。従っ
て、図示せぬエアー供給源からエアーアシスト通路17
3 にエアーを供給すると、そのエアーはピントル34の
下向きテーパ面342 の先端に上向きに吹きつけられ
る。
The cap 17 extends radially inward from the outer peripheral surface of the one support arm 17 2 to the center of the inner fuel spray guide means 32, and extends upward from there to the center of the inner fuel spray guide means 32. An air assist passage 17 3 is opened at the top surface. Air assist passage 1
The opening of 7 3 is the tip of the umbrella portion 34 3 of the pintle 34 (that is,
It is coaxially opposed to the downward tapered surface 34 2 ). Therefore, from the air supply source (not shown), the air assist passage 17
When air is supplied to 3 , the air is blown upward to the tip of the downward taper surface 34 2 of the pintle 34.

【0017】ピントル34の外周及び外側燃料噴霧ガイ
ド手段31の内周間に形成された環状膨張室35と一対
のノズル33,33とを結ぶ通路の壁面、即ち外側燃料
噴霧ガイド手段31の内壁及び内側燃料噴霧ガイド手段
32の外壁は前記噴霧外側角度θ2 及び噴霧内側角度θ
1 に合うように末広がりに拡開している。そして外側燃
料噴霧ガイド手段31の内壁は突起のない滑らかな面と
され、また内側燃料噴霧ガイド手段32の内壁は噴霧内
側角度θ1 に合うように3段に配置された環状段部32
1 …(図4参照)が形成される。
The wall surface of the passage connecting the annular expansion chamber 35 formed between the outer periphery of the pintle 34 and the inner periphery of the outer fuel spray guide means 31 and the pair of nozzles 33, 33, that is, the inner wall of the outer fuel spray guide means 31 and The outer wall of the inner fuel spray guide means 32 has an outer spray angle θ 2 and an inner spray angle θ.
It expands to the end to fit 1 . The inner wall of the outer fuel spray guide means 31 is a smooth surface without protrusions, and the inner wall of the inner fuel spray guide means 32 is an annular step portion 32 arranged in three steps so as to match the spray inner angle θ 1.
1 (see FIG. 4) is formed.

【0018】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.

【0019】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 を通過して環状膨張室35内に
噴射される。環状膨張室35内に噴射された燃料は、ピ
ントル34の傘部343 の上向きテーパ面341 に衝突
して放射状に拡散しながら微粒化する。このとき、エア
ーアシスト通路173 からピントル34の傘部343
下向きテーパ面342 に吹きつけられたエアーは放射状
に拡散して前記微粒化した燃料と衝突して均一に混合す
るため、燃料の微粒化が更に促進される。しかも、その
際にエアーアシスト通路173 から噴出したエアーが互
いに向かい合うように大きな相対速度で燃料に衝突する
ので、燃料の微粒化がより一層促進されて粒径の安定化
が図られる。
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 annular expansion chamber 35. The fuel injected into the annular expansion chamber 35 collides with the upward tapered surface 34 1 of the umbrella portion 34 3 of the pintle 34 and is diffused radially and atomized. At this time, the air blown from the air assist passage 17 3 to the downward tapered surface 34 2 of the umbrella portion 34 3 of the pintle 34 radially diffuses and collides with the atomized fuel to uniformly mix, so The atomization of is further promoted. Moreover, at this time, the air jetted from the air assist passage 17 3 collides with the fuel at a large relative velocity so as to face each other, so atomization of the fuel is further promoted and the particle size is stabilized.

【0020】上述のようにして微粒化された燃料は外側
燃料噴霧ガイド手段31の内壁及び内側燃料噴霧ガイド
手段32の外壁間に形成された末広がりの通路に案内さ
れ、キャップ17の下端に形成された一対の三日月状の
ノズル33,33から吸気ポート4内に噴霧される。そ
の際、燃料は内側燃料噴霧ガイド手段32に3段に形成
された環状段部321 …により流速の低下が防止され
る。ノズル33,33を通過した燃料はコーン状に拡開
し、吸気弁孔9及び吸気弁6の傘部62 間に形成された
隙間に向けて噴霧される。
The fuel atomized as described above is guided to the diverging passage formed between the inner wall of the outer fuel spray guide means 31 and the outer wall of the inner fuel spray guide means 32, and is formed at the lower end of the cap 17. Sprayed into the intake port 4 from a pair of crescent-shaped nozzles 33, 33. At this time, the flow velocity of the fuel is prevented from decreasing due to the annular step portions 32 1 formed in the inner fuel spray guide means 32 in three steps. The fuel that has passed through the nozzle 33, 33 is widened in a cone shape, and is sprayed toward the gap formed between the valve head 6 2 of the intake valve bore 9 and intake valve 6.

【0021】一対のノズル33,33は支持腕172
172 によってセパレートされているため、その燃料噴
霧パターンは図6に示すようになる。即ち、燃料噴霧パ
ターンは長径がD1 、短径がD2 の概略楕円形状であ
り、互いに対向する位置に前記支持腕172 ,172
よって形成された長さLの噴霧欠如部a,aを有してい
る。而して、燃料噴霧パターンは、長さLだけ離間した
一対の三日月形状となっている。
The pair of nozzles 33, 33 includes a support arm 17 2 ,
The fuel spray pattern is as shown in FIG. 6 because it is separated by 17 2 . That is, the fuel spray pattern has a substantially elliptical shape having a major axis D 1 and a minor axis D 2 , and the spray lacking portions a and a having a length L formed by the supporting arms 17 2 and 17 2 at positions facing each other. have. Thus, the fuel spray pattern has a pair of crescent shapes separated by the length L.

【0022】図1から明らかなように、電磁式燃料噴射
弁Iの軸線と吸気弁6の杆部61 の軸線とは所定の角度
をもって交差するため、電磁式燃料噴射弁Iの軸線方向
から見た吸気弁孔9の形状は円形ではなく楕円形とな
る。従って、燃料噴霧パターンを円形にすると、図1に
示す吸気弁孔9のA部及びB部で噴霧が吸気ポート4の
壁面に衝突して吸気弁孔9から燃焼室3内にスムーズに
導入されず、液状の燃料が吸気ポート4の壁面に付着し
て空燃比が変化してしまう問題がある。しかしながら、
本実施例のごとく燃料噴霧パターンを概略楕円形状とし
て吸気弁孔9の投影形状に一致させることにより、噴霧
が吸気弁孔9のA部及びB部に衝突し難くなって前記問
題が解決される。
As is apparent from FIG. 1, the axis of the electromagnetic fuel injection valve I and the axis of the rod portion 6 1 of the intake valve 6 intersect each other at a predetermined angle. The shape of the intake valve hole 9 seen is not a circle but an ellipse. Therefore, if the fuel spray pattern is circular, the spray collides with the wall surface of the intake port 4 at the portions A and B of the intake valve hole 9 shown in FIG. 1 and is smoothly introduced into the combustion chamber 3 from the intake valve hole 9. However, there is a problem that liquid fuel adheres to the wall surface of the intake port 4 and the air-fuel ratio changes. However,
By making the fuel spray pattern substantially elliptical to match the projected shape of the intake valve hole 9 as in the present embodiment, it becomes difficult for the spray to collide with the portions A and B of the intake valve hole 9, and the above problem is solved. .

【0023】しかも、本実施例の燃料噴霧パターンは一
対の噴霧欠如部a,aを持ち、その噴霧欠如部a,aを
前記A部及びB部に対応させているので、噴霧が吸気ポ
ート4の壁面に衝突することが一層確実に回避される。
更に、一方の噴霧欠如部aは吸気弁6の杆部61 の位置
に対応しているので、噴霧が杆部61 に衝突するのを回
避して空燃比の変動を効果的に防止することが可能とな
る。
Moreover, the fuel spray pattern of this embodiment has a pair of spray missing portions a, a, and the spray missing portions a, a correspond to the portions A and B, so that the spray is the intake port 4. The collision with the wall surface of is more reliably avoided.
Further, since one of the spray lacking portions a corresponds to the position of the rod portion 6 1 of the intake valve 6, the spray is prevented from colliding with the rod portion 6 1 and the fluctuation of the air-fuel ratio is effectively prevented. It becomes possible.

【0024】また、外側燃料噴霧ガイド手段31の形状
及び内側燃料噴霧ガイド手段32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, the fuel spray pattern can be arbitrarily set only by changing the shapes of the outer fuel spray guide means 31 and the inner fuel spray guide means 32 (that is, the shape of the cap 17). Thus, it is possible to provide the electromagnetic fuel injection valve I that is low in cost and highly versatile.

【0025】また、本実施例においては、燃料噴霧パタ
ーンを1個の吸気弁6にのみ対応させたが、複数の吸気
弁に対して対応させるようにしても良い。例えば、2個
の吸気弁の場合、図6において一方の三日月形状噴霧を
一方の吸気弁に対応させ、他方の三日月形状噴霧を他方
の吸気弁に対応させても良い。このように、隔離した複
数の吸気弁に各々対応させて用いることにより、本実施
例における効果を奏しながら、複吸気エンジンにも適用
することが可能となる。
Further, although the fuel spray pattern is made to correspond to only one intake valve 6 in this embodiment, it may be made to correspond to a plurality of intake valves. For example, in the case of two intake valves, one crescent-shaped spray may correspond to one intake valve and the other crescent-shaped spray may correspond to the other intake valve in FIG. In this way, by using the plurality of isolated intake valves so as to correspond to each other, it is possible to apply to a multiple intake engine while achieving the effect of the present embodiment.

【0026】図7〜図9は本発明の第2実施例を示すも
ので、図7は第1実施例の図3に対応する断面図、図8
は図7の8−8線矢視図、図9は図7の9−9線断面図
である。この第2実施例において、前記第1実施例と共
通の部材には同じ符号が付してある。
7 to 9 show a second embodiment of the present invention. FIG. 7 is a sectional view corresponding to FIG. 3 of the first embodiment, and FIG.
Is a view taken along the line 8-8 of FIG. 7, and FIG. 9 is a sectional view taken along the line 9-9 of FIG. In the second embodiment, members common to those in the first embodiment are designated by the same reference numerals.

【0027】第2実施例の電磁式燃料噴射弁Iは、内側
燃料噴霧ガイド手段32が1本の支持腕172 によって
支持されている。従って、ノズル33の数は単数とな
り、その形状は円の一部が欠如した馬蹄形となる。そし
て燃料噴霧パターンは円の一部に1個の噴霧欠如部aを
有する図9の形状となる。
In the electromagnetic fuel injection valve I of the second embodiment, the inner fuel spray guide means 32 is supported by one support arm 17 2 . Therefore, the number of nozzles 33 is singular, and the shape thereof is a horseshoe shape in which a part of the circle is missing. The fuel spray pattern has a shape shown in FIG. 9 in which one spray lacking portion a is provided in a part of the circle.

【0028】この第2実施例は燃料噴霧パターンの噴霧
欠如部aを吸気弁6の杆部61 の位置に対応させてお
り、これにより噴霧が杆部61 及び吸気ポート4のA部
に衝突するのを回避して空燃比の変動を防止することが
できる。
In the second embodiment, the spray lacking portion a of the fuel spray pattern is made to correspond to the position of the rod portion 6 1 of the intake valve 6, so that the spray is directed to the rod portion 6 1 and the portion A of the intake port 4. It is possible to avoid the collision and prevent the fluctuation of the air-fuel ratio.

【0029】尚、第2実施例において、エアーアシスト
通路173 からピントル34にエアーを吹きつけること
により燃料の微粒化、均一化及び粒径の安定化が可能で
あることは、第1実施例と同様である。
In the second embodiment, it is possible to atomize the fuel, make it uniform and stabilize the particle size by blowing air from the air assist passage 17 3 to the pintle 34. Is the same as.

【0030】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 embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design changes can be made.

【0031】例えば、実施例では外側燃料噴霧ガイド手
段31を独立した部材で構成しているが、それをインジ
ェクタボディ16やキャップ17と一体化することがで
きる。また、実施例では内側燃料噴霧ガイド手段32を
キャップ17と一体化しているが、それを独立した部材
で構成することができる。また、外側燃料噴霧ガイド手
段31の内壁にも環状段部を突設することができる。ま
た、燃料噴霧パターンは吸気ポート4の形状等に応じて
適宜変更可能であり、第1実施例のものを図10の如く
変更したり、第2実施例のものを図11、図12の如く
変更することができる。
For example, in the embodiment, the outer fuel spray guide means 31 is constituted by an independent member, but it can be integrated with the injector body 16 and the cap 17. Further, in the embodiment, the inner fuel spray guide means 32 is integrated with the cap 17, but it can be constituted by an independent member. Further, an annular step may be provided so as to project also on the inner wall of the outer fuel spray guide means 31. Further, the fuel spray pattern can be appropriately changed according to the shape of the intake port 4, etc., and the first embodiment can be changed as shown in FIG. 10 or the second embodiment can be changed as shown in FIGS. Can be changed.

【0032】[0032]

【発明の効果】以上のように本発明によれば、ピントル
の下流側に設けたエアーアシスト通路を該ピントルの先
端に同軸に対向させたので、燃料に対してエアーを均等
に混合させて燃料の微粒化及び均一化を促進することが
できるばかりか、燃料に対して大きな相対速度でエアー
を衝突させて粒径の安定化を図ることができる。しか
も、ピントルを備えた従来の電磁式燃料噴射弁にエアー
アシスト通路を付加するだけで良いため、極めて低コス
トで実現可能である。
As described above, according to the present invention, since the air assist passage provided on the downstream side of the pintle is coaxially opposed to the tip of the pintle, the air is uniformly mixed with the fuel and the fuel is mixed. Not only can the atomization and homogenization of the above be promoted, but also the air can be made to collide with the fuel at a large relative velocity to stabilize the particle size. Moreover, since it is only necessary to add the air assist passage to the conventional electromagnetic fuel injection valve having the pintle, it can be realized 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】電磁式燃料噴射弁の全体側面図FIG. 2 is an overall side view of an electromagnetic fuel injection valve.

【図3】図2の要部拡大図FIG. 3 is an enlarged view of a main part of FIG.

【図4】図3の4−4線断面図FIG. 4 is a sectional view taken along line 4-4 of FIG.

【図5】図3の5−5線矢視図5 is a view taken along line 5-5 of FIG.

【図6】図3の6−6線断面図6 is a sectional view taken along line 6-6 of FIG.

【図7】本発明の第2実施例に係る、前記図3に対応す
る断面図
FIG. 7 is a sectional view corresponding to FIG. 3 according to a second embodiment of the present invention.

【図8】図7の8−8矢視図図FIG. 8 is a view taken along the line 8-8 of FIG.

【図9】図7の9−9線断面図9 is a sectional view taken along line 9-9 of FIG.

【図10】燃料噴霧パターンの他の実施例を示す図FIG. 10 is a diagram showing another example of the fuel spray pattern.

【図11】燃料噴霧パターンの他の実施例を示す図FIG. 11 is a diagram showing another embodiment of the fuel spray pattern.

【図12】燃料噴霧パターンの他の実施例を示す図FIG. 12 is a diagram showing another example 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 173 エアーアシスト通路 21 ニードル弁 31 外側燃料噴霧ガイド手段(燃料噴霧ガイド
手段) 34 ピントル
16 injector body 16 3 fuel injection hole 17 3 air assist passage 21 needle valve 31 outer fuel spray guide means (fuel spray guide means) 34 pintle

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、 燃料噴射孔(163 )の下流側に設けられて燃料の噴霧
角度を規制する筒状の燃料噴霧ガイド手段(31)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 )を貫通して燃料噴霧ガイド手
段(31)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(34)と、 ピントル(34)の下流側の燃料噴霧ガイド手段(3
1)内に配置されて前記ピントル(34)の先端に同軸
に対向するエアーアシスト通路(173 )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 the fuel injection hole (163) Is provided on the downstream side of the fuel spray
A cylindrical fuel spray guide means (31) for controlling the angle, and a fuel injection hole (163) To atomize the fuel that has passed
The fuel injection hole (16 3) Through the fuel spray guide hand
Tip of needle valve (21) so as to extend into step (31)
And a fuel spray guide means (3) on the downstream side of the pintle (34).
1) Located inside and coaxial to the tip of the pintle (34)
Air assist passage (173), And
An electromagnetic fuel injection valve characterized in that
JP5635194A 1994-03-25 1994-03-25 Electromagnetic fuel injection valve Expired - Lifetime JP2599692B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5635194A JP2599692B2 (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve
EP94308896A EP0678667B1 (en) 1994-03-25 1994-11-30 Solenoid type fuel injection valve
DE69412453T DE69412453T2 (en) 1994-03-25 1994-11-30 Electromagnetic fuel injector
US08/352,095 US5540388A (en) 1994-03-25 1994-11-30 Solenoid type fuel injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5635194A JP2599692B2 (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve

Publications (2)

Publication Number Publication Date
JPH07259699A true JPH07259699A (en) 1995-10-09
JP2599692B2 JP2599692B2 (en) 1997-04-09

Family

ID=13024819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5635194A Expired - Lifetime JP2599692B2 (en) 1994-03-25 1994-03-25 Electromagnetic fuel injection valve

Country Status (1)

Country Link
JP (1) JP2599692B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220209A (en) * 2010-04-08 2011-11-04 Toyota Motor Corp Fuel injection nozzle and direct injection type fuel injection valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220209A (en) * 2010-04-08 2011-11-04 Toyota Motor Corp Fuel injection nozzle and direct injection type fuel injection valve

Also Published As

Publication number Publication date
JP2599692B2 (en) 1997-04-09

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