JPH0830458B2 - Fuel injector - Google Patents
Fuel injectorInfo
- Publication number
- JPH0830458B2 JPH0830458B2 JP1282713A JP28271389A JPH0830458B2 JP H0830458 B2 JPH0830458 B2 JP H0830458B2 JP 1282713 A JP1282713 A JP 1282713A JP 28271389 A JP28271389 A JP 28271389A JP H0830458 B2 JPH0830458 B2 JP H0830458B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- iron core
- coil bobbin
- core portion
- injector
- 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
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- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば電子制御式燃料噴射装置等に好適に
用られるフューエルインジェクタに関する。Description: [Industrial field of application] The present invention relates to a fuel injector suitably used in, for example, an electronically controlled fuel injection device.
第３図及び第４図に従来技術によるフューエルインジ
ェクタを示す。3 and 4 show a conventional fuel injector.
図において、１は例えば電磁ステンレス鋼製のインジ
ェクタ本体で、該インジェクタ本体１は中空の外筒部２
と、該外筒部２の軸方向一側に形成された閉塞部３と、
該閉塞部３の中心から軸方向他側に突出し、外周面4A及
び平坦な先端面4Bとによって円柱状に形成された鉄心部
４とからなり、外筒部２と鉄心部４との間は環状のコイ
ルボビン収容部５になっている。そして、前記外筒部２
にはコイルボビン収容部５に連通する燃料流出入口6,6
が径方向に穿設され、閉塞部３には後述するコイルボビ
ン14のピン支持部14E,14Eが挿嵌される一対の貫通孔7,7
が形成されている。In the figure, 1 is an injector body made of, for example, electromagnetic stainless steel, and the injector body 1 is a hollow outer cylinder portion 2
And a closing portion 3 formed on one side of the outer tubular portion 2 in the axial direction,
It is composed of an iron core portion 4 projecting from the center of the closed portion 3 to the other side in the axial direction and formed in a cylindrical shape by an outer peripheral surface 4A and a flat tip surface 4B, and between the outer cylindrical portion 2 and the iron core portion 4. An annular coil bobbin accommodating portion 5 is formed. Then, the outer cylinder portion 2
Is connected to the coil bobbin accommodating portion 5 through a fuel outflow port 6,6.
Are provided in the radial direction, and a pair of through holes 7, 7 into which pin support portions 14E, 14E of the coil bobbin 14 to be described later are inserted and fitted in the closing portion 3 are formed.
Are formed.
８は前記インジェクタ本体１の軸方向他側を閉塞する
ように外筒部２に嵌着された弁座部材で、該弁座部材８
は板状の基部8Aと、該基部8A中心に前記鉄心部４側に突
出形成された弁座8Bと、基部8Aの外面外周側から軸方向
に突出形成された円筒状のスカート部8Cとから構成され
ている。9,9は前記弁座部材８に設けられた噴射孔で該
噴射孔9,9は弁座8Bに開口するように基部8Aの中心に穿
設されている。Reference numeral 8 denotes a valve seat member fitted to the outer cylinder portion 2 so as to close the other axial side of the injector body 1.
Is a plate-shaped base portion 8A, a valve seat 8B formed on the center of the base portion 8A so as to project toward the iron core portion 4 side, and a cylindrical skirt portion 8C formed so as to project axially from the outer peripheral side of the base portion 8A. It is configured. Reference numerals 9 and 9 denote injection holes provided in the valve seat member 8, and the injection holes 9 and 9 are formed at the center of the base portion 8A so as to open to the valve seat 8B.
10は前記弁座部材８の内面に当接した状態でインジェ
クタ本体１の外筒部２内に嵌合された環状平板からなる
シム、11は該シム10の内側に遊嵌した状態で前記弁座部
材８と鉄心部４との間に配設された磁性材からなる平板
状の弁体で、該弁体11には弁座8Bの外周側に開口する燃
料流通穴11A,11Aが形成されている。12は皿ばねからな
る弁ばねを示し、該弁ばね12は内周縁が前記弁体11の外
周縁に圧接することにより該弁体11を弁座8Bに着座する
方向に常時付勢している。Reference numeral 10 is a shim made of an annular flat plate fitted in the outer cylinder portion 2 of the injector body 1 in a state of being in contact with the inner surface of the valve seat member 8, and 11 is the valve in a state of being loosely fitted inside the shim 10. A flat plate-shaped valve body made of a magnetic material disposed between the seat member 8 and the iron core portion 4, and the valve body 11 is provided with fuel flow holes 11A, 11A opening to the outer peripheral side of the valve seat 8B. ing. Reference numeral 12 denotes a valve spring composed of a disc spring, and the valve spring 12 is always urged in the direction in which the valve body 11 is seated on the valve seat 8B by pressing the inner peripheral edge thereof against the outer peripheral edge of the valve body 11. .
次に、13は前記弁ばね12のばね力に抗して弁体11を弁
座8Bから離間させるための電磁ソレノイドを示す。14は
前記鉄心部４と共に該電磁ソレノイド13を構成するコイ
ルボビンで、該コイルボビン14は中空の円筒部14Aと、
該円筒部14Aの外周に軸方向に隔設された一側鍔部14B、
中間鍔部14C及び他側鍔部14Dと、該一側鍔部14Bの外面
に突出形成された一対の円柱状のピン支持部14E,14Eと
から構成されている。15は前記中間鍔部14Cと他側鍔部1
4Dとの間に位置して円筒部14Aに巻回された電磁コイル
で、該電磁コイル15は前記一側鍔部14Bから各ピン支持
部14Eにかけて挿設された一対の端子ピン16,16と接続さ
れている。そして、電磁コイル15の外周側は一側鍔部14
Bから他側鍔部14Dにかけて形成された絶縁性樹脂からな
るモールド層17によって被覆されている。Next, 13 is an electromagnetic solenoid for separating the valve body 11 from the valve seat 8B against the spring force of the valve spring 12. Reference numeral 14 is a coil bobbin that constitutes the electromagnetic solenoid 13 together with the iron core portion 4, and the coil bobbin 14 has a hollow cylindrical portion 14A,
One side flange portion 14B axially separated from the outer circumference of the cylindrical portion 14A,
The intermediate flange portion 14C and the other side flange portion 14D, and a pair of columnar pin support portions 14E, 14E projectingly formed on the outer surface of the one side flange portion 14B. 15 is the intermediate collar portion 14C and the other side collar portion 1
4D is an electromagnetic coil that is wound between the cylindrical portion 14A and is located between 4D, the electromagnetic coil 15 and a pair of terminal pins 16, 16 inserted from the one side collar portion 14B to each pin support portion 14E It is connected. The outer peripheral side of the electromagnetic coil 15 is provided with the one side collar portion 14
It is covered with a mold layer 17 made of an insulating resin formed from B to the other side flange portion 14D.
かくして、電磁ソレノイド13は鉄心部４とコイルボビ
ン14と、電磁コイル15とから大略構成されるが、コイル
ボビン14は鉄心部４に挿嵌した状態でインジェクタ本体
１のコイルボビン収容部５内に収納されており、外筒部
２とモールド層17との間及び鉄心部４とコイルボビン14
との間の隙間は燃料流路18になっている。Thus, the electromagnetic solenoid 13 is roughly composed of the iron core portion 4, the coil bobbin 14, and the electromagnetic coil 15. The coil bobbin 14 is housed in the coil bobbin housing portion 5 of the injector body 1 while being fitted into the iron core portion 4. Between the outer tube portion 2 and the mold layer 17, and between the iron core portion 4 and the coil bobbin 14.
The gap between and is the fuel flow path 18.
19は弁体11の開度を規制するためのストッパプレート
で、該ストッパプレート19は内周側下面に環状のストッ
パ面19Aが突出形成された環状体からなっており、鉄心
部４の先端外周側に位置して該ストッパ面19Aを弁体11
に対向させた状態で外筒部２に嵌合されている。そし
て、該ストッパプレート19によって弁体11と鉄心部４の
先端面4Bとの間には約70μｍのギャップＧが保たれるよ
うになっている。Reference numeral 19 denotes a stopper plate for restricting the opening degree of the valve body 11, and the stopper plate 19 is made of an annular body having an annular stopper surface 19A projectingly formed on the lower surface on the inner peripheral side. Located on the side of the valve body 11 and the stopper surface 19A
It is fitted to the outer tubular portion 2 in a state of being opposed to. The stopper plate 19 keeps a gap G of about 70 μm between the valve body 11 and the front end surface 4B of the iron core portion 4.
なお、図中20は燃料流入口6,6を覆うように外筒部２
外周に嵌合されたフィルタ、21は外筒部２の一端側に嵌
着された蓋体である。In the figure, 20 is the outer cylinder part 2 so as to cover the fuel inlets 6, 6.
A filter fitted to the outer circumference, and a lid 21 fitted to one end of the outer tubular portion 2.
従来技術のフューエルインジェクタは上述の如く構成
されるが次にその作動について説明する。The prior art fuel injector is constructed as described above and its operation will now be described.
まず、燃料ポンプからの燃料は燃料ホース（図示せ
ず）、フィルタ20を介して燃料流出入口6,6から外筒部
２内に所定の燃圧をもって供給され、燃料流路18を通っ
て弁体11近傍に滞留する。そして、図示しないコントロ
ールユニットからの噴射信号により、端子ピン16,16を
介して電磁コイル15に給電を行なうと、鉄心部４が励磁
されてその先端面4B側に弁体11が弁ばね12のばね力に抗
して吸引されることになる。かくして、弁体11は弁座8B
から離座して開弁し、ストッパプレート19のストッパ面
19Aに当接した状態に保持され、燃料流路18内の燃料は
燃料流通穴11A,11Aを通って各噴射孔９から噴射され
る。First, the fuel from the fuel pump is supplied with a predetermined fuel pressure from the fuel outflow inlets 6, 6 through the fuel hose (not shown) and the filter 20 into the outer cylinder portion 2, and passes through the fuel flow path 18 to the valve body. Stay in the vicinity of 11. Then, when power is supplied to the electromagnetic coil 15 via the terminal pins 16 and 16 by the injection signal from the control unit (not shown), the iron core portion 4 is excited and the valve body 11 and the valve spring 12 on the tip end surface 4B side. It will be sucked against the spring force. Thus, the valve body 11 is the valve seat 8B.
And the valve is opened, and the stopper surface of the stopper plate 19
The fuel in the fuel flow path 18 is held in contact with 19A and is injected from each injection hole 9 through the fuel flow holes 11A, 11A.
一方、電磁コイル15に対する給電停止時には電磁コイ
ル15が消磁し、弁ばね12のばね力によって弁体11は弁座
8Aに着座して燃料の噴射が停止される。On the other hand, when power supply to the electromagnetic coil 15 is stopped, the electromagnetic coil 15 is demagnetized, and the spring force of the valve spring 12 causes the valve element 11 to move to the valve seat.
Seat 8A and stop fuel injection.
ところで、上述した従来技術では、鉄心部４の先端面
4Bと弁体11との間にはストッパプレート19によって約70
μｍのギャップＧを保持するように構成しているので、
該ギャップＧ内にも燃料が浸入することになる。このた
め、フィルタ20によって除去されなかった燃料中の異
物、コイルボビン14のバリ等の種々の異物が燃料と共に
該ギャップＧ内に侵入し、鉄心部４の先端面4Bと弁体11
との間に食い込んだ状態になることが生じる。By the way, in the above-mentioned conventional technique, the tip surface of the iron core portion 4 is
Between the 4B and the valve body 11 is about 70 due to the stopper plate 19.
Since it is configured to hold the gap G of μm,
The fuel also enters the gap G. Therefore, foreign matters in the fuel that have not been removed by the filter 20, various foreign matters such as burrs of the coil bobbin 14, enter the gap G together with the fuel, and the tip end surface 4B of the iron core portion 4 and the valve body 11 are penetrated.
It will be in a state of biting between and.
かくしては、電磁コイル15に給電し、鉄心部４を励磁
しても弁体11が弁座8Bから離座できなかったり、所定の
開度を得ることができず、フューエルインジェクタがパ
ルスデューティに対応した噴射量の燃料を噴射できない
という問題が生じる。Thus, even if power is supplied to the electromagnetic coil 15 and the iron core portion 4 is excited, the valve body 11 cannot be separated from the valve seat 8B, or a predetermined opening cannot be obtained, and the fuel injector corresponds to the pulse duty. There arises a problem that it is impossible to inject a certain amount of fuel.
本発明は上述した従来技術の欠点に鑑みなされたもの
で、鉄心と弁体との間のギャップに異物が食い込んで弁
体の変位を規制する現象を防止し、弁体が所定開度開弁
できるようにしたフューエルインジェクタを提供するも
のである。The present invention has been made in view of the above-mentioned drawbacks of the prior art, and prevents a phenomenon in which a foreign body bites into a gap between an iron core and a valve body to restrict displacement of the valve body, and the valve body opens a predetermined opening degree. The fuel injector is made available.
上述した課題を解決するために、本発明は、軸方向一
側が閉塞部となり、該閉塞部から軸方向に鉄心部が延び
た筒状のインジェクタ本体と、該インジェクタ本体の軸
方向他側を閉塞するように設けられた弁座部材と、該弁
座部材に設けられ、前記インジェクタ本体内に燃料を噴
射する噴射孔と、前記弁座部材の弁座に離着座すること
により該噴射孔を開閉する平板状の弁体と、該弁体の外
周側に位置して前記インジェクタ本体に設けられ、該弁
体を前記弁座側に向けて常時付勢するばねと、前記イン
ジェクタ本体内に位置して前記鉄心部に挿嵌され、電磁
アクチュエータを構成するコイルが巻回されたコイルボ
ビンとからなるフューエルインジェクタに適用される。In order to solve the above-mentioned problem, the present invention has a tubular injector body in which one side in the axial direction is a closed portion and an iron core portion extends from the closed portion in the axial direction, and the other side in the axial direction of the injector body is closed. A valve seat member that is provided with a valve seat member, an injection hole that is provided in the valve seat member, and that injects fuel into the injector body, and a seat that opens and closes the valve seat member by opening and closing the injection hole. A flat plate-shaped valve body, a spring provided on the injector body located on the outer peripheral side of the valve body, for constantly urging the valve body toward the valve seat side, and a spring located in the injector body. And a coil bobbin around which a coil that constitutes an electromagnetic actuator is wound, and is applied to the iron core portion.
そして、本発明が採用する構成の特徴は、前記鉄心部
には、流入口が該鉄心部の外周面に開口し流出口が前記
弁体に対向した先端面に開口する燃料通路を形成し、前
記コイルボビンには、前記インジェクタ本体の閉塞部と
の間に位置して該コイルボビンの径方向に延び、前記イ
ンジェクタ本体内から径方向に燃料を導く燃料案内溝を
設け、かつ前記鉄心部とコイルボビンとの間には、該燃
料案内溝からの燃料を前記鉄心部に設けた前記燃料通路
の流入口側に流通させる環状隙間を形成したことにあ
る。And, the feature of the configuration adopted by the present invention is that, in the iron core portion, an inlet is formed on an outer peripheral surface of the iron core portion, and an outlet is formed on a tip surface facing the valve body. The coil bobbin is provided with a fuel guide groove that is located between the coil bobbin and the closed portion of the injector body, extends in the radial direction of the coil bobbin, and guides fuel from the inside of the injector body in the radial direction, and the iron core portion and the coil bobbin. Between them, an annular gap is formed to allow the fuel from the fuel guide groove to flow to the inlet side of the fuel passage provided in the iron core portion.
上記構成によれば、電磁アクチュエータによって弁体
が開弁すると、インジェクタ本体内に供給された燃料は
噴射孔から外部に噴射される。このとき、インジェクタ
本体内に流入した燃料の一部は、コイルボビンの径方向
に延びる燃料案内溝からコイルボビンの内周側に導か
れ、さらに鉄心部とコイルボビンとの間に形成された環
状隙間を介して燃料通路の流入口側に流れ、弁体に対向
する鉄心部の先端面に開口した流出口から該弁体に向け
て吹き出す。これにより、鉄心部の燃料通路内に多量の
燃料が導入され、当該多量の燃料が鉄心部先端面の流出
口から弁体に向けて吹き出すことにより、鉄心部の先端
面と弁体との間に形成されたギャップ内に侵入した異物
が、吹き出す燃料の圧力によってギャップ外にパージさ
れる。According to the above configuration, when the valve body is opened by the electromagnetic actuator, the fuel supplied into the injector body is injected outside from the injection hole. At this time, part of the fuel that has flowed into the injector body is guided to the inner peripheral side of the coil bobbin from the fuel guide groove that extends in the radial direction of the coil bobbin, and further passes through the annular gap formed between the iron core part and the coil bobbin. And flows toward the inlet side of the fuel passage, and is blown toward the valve body from the outlet opening at the tip end surface of the iron core portion facing the valve body. As a result, a large amount of fuel is introduced into the fuel passage of the iron core part, and the large amount of fuel is blown out from the outlet of the iron core part front end face toward the valve body, so that between the tip end face of the iron core part and the valve body. Foreign matter that has entered the gap formed in the gap is purged out of the gap by the pressure of the fuel that blows out.
以下、本発明の実施例を第１図及び第２図に基づき説
明する。なお、前述した従来技術の構成要素と同一の構
成要素には同一符号を付し、その説明を省略する。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same components as those of the conventional technique described above are designated by the same reference numerals, and the description thereof will be omitted.
然るに、図において31は電磁アクチュエータ13を構成
する鉄心部４に穿設された燃料通路を示す。該燃料通路
31は鉄心部４の径方向に燃料流出入口６と同軸に穿設さ
れた径方向穴32と、該径方向穴32とＴ字状をなすように
鉄心部４の軸方向に穿設された軸方向穴33とから形成さ
れており、該燃料通路31の流入口31Aはコイルボビン収
容部５に臨んで鉄心部４の外周面4Aに開口し、流出口31
Bは弁体11に対向して鉄心部４の先端面4Bに開口してい
る。Therefore, reference numeral 31 in the drawing denotes a fuel passage formed in the iron core portion 4 forming the electromagnetic actuator 13. The fuel passage
Reference numeral 31 denotes a radial hole 32 formed coaxially with the fuel outlet / inlet 6 in the radial direction of the iron core portion 4, and an axial direction of the iron core portion 4 so as to form a T shape with the radial hole 32. The fuel passage 31 is formed with an axial hole 33, and the inlet 31A of the fuel passage 31 faces the coil bobbin accommodating portion 5 and opens on the outer peripheral surface 4A of the iron core portion 4.
B is opposed to the valve element 11 and is opened at the tip surface 4B of the iron core portion 4.
更に、本実施例では第２図に示すように、コイルボビ
ン14の一側鍔部14B外面には円筒部14Aの内周に向けて複
数の燃料案内溝34,34,…が径方向に形成してある。Further, in this embodiment, as shown in FIG. 2, a plurality of fuel guide grooves 34, 34, ... Are formed in the radial direction on the outer surface of the one side flange portion 14B of the coil bobbin 14 toward the inner circumference of the cylindrical portion 14A. There is.
なお、鉄心部４の外周面4Aとコイルボビン14の円筒部
14A内周面との間は若干の環状隙間35が形成されるもの
で、この環状隙間35は鉄心部４にコイルボビン14を挿入
するときの容易性確保のためにテーパ状に形成され、ま
たコイルボビン14を成形するときの“ひけ”等によって
も生じるものである。The outer peripheral surface 4A of the iron core portion 4 and the cylindrical portion of the coil bobbin 14
A slight annular clearance 35 is formed between the inner peripheral surface of 14A and the annular clearance 35. The annular clearance 35 is formed in a tapered shape for ensuring the ease of inserting the coil bobbin 14 into the iron core portion 4. It is also caused by "sink" when molding 14.
本実施例によるフユーエルインジェクタは上述の如き
構成を有するもので、その基本的作動につては従来技術
によるものと格別差異はない。The fuel injector according to the present embodiment has the above-mentioned structure, and its basic operation is not different from that according to the prior art.
然るに、鉄心部４には流入口31Aが外周面に開口し、
流出口31Bが先端面4Bに開口する燃料通路31を形成して
ある。従って、電磁コイル15が励磁されて弁体11が開弁
すると、燃料流出入口6,6を介して外筒部２内に供給さ
れた燃料は、燃料流路18を通って弁体11側に流動し、各
燃料流通穴11Aを通って各噴射孔９から外部に噴射され
るが、このとき、燃料流路18内に導入された燃料の一部
は、コイルボビン14の一側鍔部14Bに形成された各燃料
案内溝34からコイルボビン14の内周側に形成された環状
隙間35を流れ、鉄心部４の外周面に開口した流入口31A
から燃料通路31内に導入される。そして、燃料通路31の
軸方向穴33内を流れた燃料は、鉄心部４の先端面4Bに形
成された流出口31Bから弁体11に向けて吹き出す。これ
により、鉄心部４と弁体11との間に侵入した異物をギャ
ップＧ外にパージすることができる。However, the inflow port 31A opens on the outer peripheral surface of the iron core portion 4,
The outflow port 31B forms a fuel passage 31 that opens to the front end surface 4B. Therefore, when the electromagnetic coil 15 is excited and the valve body 11 opens, the fuel supplied into the outer cylinder portion 2 through the fuel outflow ports 6, 6 passes through the fuel flow path 18 to the valve body 11 side. While flowing, it is injected to the outside from each injection hole 9 through each fuel flow hole 11A, but at this time, a part of the fuel introduced into the fuel flow path 18 enters the one side flange portion 14B of the coil bobbin 14. An inlet 31A that flows from the formed fuel guide groove 34 through the annular gap 35 formed on the inner peripheral side of the coil bobbin 14 and opens on the outer peripheral surface of the iron core portion 4
Is introduced into the fuel passage 31 from. Then, the fuel that has flowed in the axial hole 33 of the fuel passage 31 is blown toward the valve body 11 from the outlet 31B formed in the tip surface 4B of the iron core portion 4. As a result, foreign matter that has entered between the iron core portion 4 and the valve body 11 can be purged out of the gap G.
しかも、本実施例によれば、コイルボビン14の一側鍔
部14B外面に複数の燃料案内溝34,34,…を形成したか
ら、該各燃料案内溝34を介して環状隙間35から燃料通路
31側に十分な量の燃料を速やかに供給することができ
る。Moreover, according to the present embodiment, since the plurality of fuel guide grooves 34, 34, ... Are formed on the outer surface of the one-side flange portion 14B of the coil bobbin 14, the fuel passage is formed from the annular gap 35 through the fuel guide grooves 34.
A sufficient amount of fuel can be quickly supplied to the 31st side.
また、電磁コイル15の発熱が伝導して鉄心部４の温度
も上昇するが、燃料通路31内を流れる燃料によって鉄心
部４を内側から冷却することができるから、鉄心部４と
コイルボビン14との間の燃料流路18内の温度上昇を防止
できる。Further, although the heat generated by the electromagnetic coil 15 is conducted and the temperature of the iron core portion 4 rises, the iron core portion 4 can be cooled from the inside by the fuel flowing in the fuel passage 31, so that the iron core portion 4 and the coil bobbin 14 are separated from each other. It is possible to prevent a temperature rise in the fuel passage 18 between them.
なお、本実施例は電磁アクチュエータ13を構成する鉄
心部４をインジェクタ本体１の外筒部２及び閉塞部３と
一体に形成するものとして述べたが、これらとは独立し
て形成した鉄心にも本発明は適用できるものである。In this embodiment, the iron core portion 4 constituting the electromagnetic actuator 13 is described as being integrally formed with the outer cylinder portion 2 and the closing portion 3 of the injector body 1, but an iron core formed independently of these may also be used. The present invention is applicable.
叙上の如く本発明によれば、インジェクタ本体の鉄心
部には、その外周面に開口する流入口と、弁体に対向す
る先端面に開口する流出口からなる燃料通路を形成し、
鉄心部に挿嵌されたコイルボビンには、インジェクタ本
体内に供給された燃料の一部を鉄心部の燃料通路に導く
燃料案内溝を形成すると共に、鉄心部とコイルボビンと
の間に、燃料案内溝からの燃料を燃料通路の流入口に流
通させる環状隙間を形成したから、インジェクタ本体内
に供給された燃料が噴射孔から外部に噴射されるとき、
燃料の一部は、コイルボビンの径方向に延びる燃料案内
溝からコイルボビンの内周側に導かれ、さらに鉄心部と
コイルボビンとの間に形成された環状隙間を介して燃料
通路の流入口側に流れ、弁体と対向する鉄心部の先端面
に開口した流出口から該弁体に向けて吹き出す。このよ
うに、鉄心部の燃料通路内に導入された多量の燃料が流
出口から弁体に向けて吹き出すことにより、鉄心部先端
面と弁体との間のギャップに侵入した異物をパージする
ことができる。この結果、鉄心部と弁体との間に異物が
食い込んで弁体がロックされたり、所定の開度を得るこ
とができないといった事態を防止でき、信頼性の高いフ
ューエルインジェクタにすることができる。According to the present invention as described above, the iron core portion of the injector body is provided with a fuel passage including an inlet opening to the outer peripheral surface thereof and an outlet opening to the tip end surface facing the valve body,
The coil bobbin inserted into the iron core part is formed with a fuel guide groove for guiding a part of the fuel supplied into the injector body to the fuel passage of the iron core part, and the fuel guide groove is provided between the iron core part and the coil bobbin. Since the annular gap that allows the fuel from the inside to flow into the inlet of the fuel passage is formed, when the fuel supplied into the injector body is injected from the injection hole to the outside,
Part of the fuel is guided to the inner peripheral side of the coil bobbin from the fuel guide groove extending in the radial direction of the coil bobbin, and further flows to the inlet side of the fuel passage through the annular gap formed between the iron core and the coil bobbin. , Is blown toward the valve body from an outflow port opened on the tip surface of the iron core portion facing the valve body. In this way, a large amount of fuel introduced into the fuel passage of the iron core is blown out from the outlet toward the valve body to purge foreign matter that has entered the gap between the tip of the iron core and the valve body. You can As a result, it is possible to prevent a situation in which a foreign body bites between the iron core portion and the valve body and the valve body is locked, or a predetermined opening cannot be obtained, and a highly reliable fuel injector can be obtained.
【図面の簡単な説明】 第１図及び第２図は本発明の実施例に係り、第１図はフ
ューエルインジェクタの縦断面図、第２図は外周がモー
ルド層によって被覆されたコイルボビンの外観斜視図、
第３図及び第４図は従来技術に係り、第３図はフューエ
ルインジェクタの縦断面図、第４図は第３図中の要部拡
大図である。 ２……インジェクタ本体、４……鉄心部、4A……外周
面、4B……先端面、８……弁座部材、９……噴射孔、11
……弁体、12……皿ばね、13……電磁アクチュエータ、
31……燃料通路、31A……流入口、31B……流出口。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 relate to an embodiment of the present invention. FIG. 1 is a vertical sectional view of a fuel injector, and FIG. 2 is an external perspective view of a coil bobbin whose outer periphery is covered with a mold layer. Figure,
3 and 4 relate to a conventional technique, FIG. 3 is a vertical cross-sectional view of a fuel injector, and FIG. 4 is an enlarged view of a main part in FIG. 2 ... Injector body, 4 ... Iron core part, 4A ... Outer peripheral surface, 4B ... Tip surface, 8 ... Valve seat member, 9 ... Injection hole, 11
...... Valve, 12 ...... Disc spring, 13 ...... Electromagnetic actuator,
31 ... Fuel passage, 31A ... Inlet, 31B ... Outlet.
Claims (1)
軸方向に鉄心部が延びた筒状のインジェクタ本体と、該
インジェクタ本体の軸方向他側を閉塞するように設けら
れた弁座部材と、該弁座部材に設けられ、前記インジェ
クタ本体内に燃料を噴射する噴射孔と、前記弁座部材の
弁座に離着座することにより該噴射孔を開閉する平板状
の弁体と、該弁体の外周側に位置して前記インジェクタ
本体に設けられ、該弁体を前記弁座側に向けて常時付勢
するばねと、前記インジェクタ本体内に位置して前記鉄
心部に挿嵌され、電磁アクチュエータを構成するコイル
が巻回されたコイルボビンとからなるフューエルインジ
ェクタにおいて、 前記鉄心部には、流入口が該鉄心部の外周面に開口し流
出口が前記弁体に対向した先端面に開口する燃料通路を
形成し、 前記コイルボビンには、前記インジェクタ本体の閉塞部
との間に位置して該コイルボビンの径方向に延び、前記
インジェクタ本体内から径方向に燃料を導く燃料案内溝
を設け、 かつ前記鉄心部とコイルボビンとの間には、該燃料案内
溝からの燃料を前記鉄心部に設けられた前記燃料通路の
流入口側に流通させる環状隙間を形成したことを特徴と
するフューエルインジェクタ。1. A cylindrical injector body having an axially closed side on which an iron core extends axially from the closed portion, and a valve seat provided so as to close the axially other side of the injector main body. A member, an injection hole provided in the valve seat member for injecting fuel into the injector body, and a flat plate-shaped valve body that opens and closes the injection hole by seating on and off the valve seat of the valve seat member, A spring that is provided on the injector body located on the outer peripheral side of the valve body and constantly biases the valve body toward the valve seat side; and a spring located inside the injector body and fitted into the iron core portion. A fuel injector comprising a coil bobbin around which a coil constituting an electromagnetic actuator is wound, wherein the iron core portion has an inlet opening on an outer peripheral surface of the iron core portion and an outlet opening on a tip surface facing the valve body. Open fuel passage And a fuel guide groove that is located between the coil bobbin and the closed portion of the injector body, extends in the radial direction of the coil bobbin, and guides fuel from the inside of the injector body in the radial direction, and the iron core portion. An annular gap is formed between the coil bobbin and the coil bobbin to allow the fuel from the fuel guide groove to flow to the inlet side of the fuel passage provided in the iron core portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1282713A JPH0830458B2 (en) | 1989-10-30 | 1989-10-30 | Fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1282713A JPH0830458B2 (en) | 1989-10-30 | 1989-10-30 | Fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03145564A JPH03145564A (en) | 1991-06-20 |
| JPH0830458B2 true JPH0830458B2 (en) | 1996-03-27 |
Family
ID=17656077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1282713A Expired - Lifetime JPH0830458B2 (en) | 1989-10-30 | 1989-10-30 | Fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830458B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332950A (en) * | 2006-06-15 | 2007-12-27 | Crf Scpa | Fuel injection device for internal combustion engine and its manufacturing method |
| KR20180078952A (en) * | 2016-12-30 | 2018-07-10 | 공주대학교 산학협력단 | Plunger return injector of magnetism |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0542667U (en) * | 1991-11-07 | 1993-06-11 | 日本電子機器株式会社 | Electromagnetic coil for fuel injector |
| US9427493B2 (en) | 2011-03-07 | 2016-08-30 | The Regents Of The University Of Colorado | Shape memory polymer intraocular lenses |
| CN106050501B (en) * | 2016-08-02 | 2018-09-11 | 成都威特电喷有限责任公司 | High reliability Electrocontrolled high-pressure fuel injection equipment (FIE) |
| CN106224148B (en) * | 2016-08-02 | 2018-12-11 | 成都威特电喷有限责任公司 | Electrocontrolled high-pressure fuel injection equipment (FIE) with switching swivel nut |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102723A1 (en) * | 1982-07-29 | 1984-03-14 | LUCAS INDUSTRIES public limited company | Plate type fuel injector |
| JPS6032973A (en) * | 1983-08-01 | 1985-02-20 | Automob Antipollut & Saf Res Center | Fuel injection valve |
-
1989
- 1989-10-30 JP JP1282713A patent/JPH0830458B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332950A (en) * | 2006-06-15 | 2007-12-27 | Crf Scpa | Fuel injection device for internal combustion engine and its manufacturing method |
| JP4602963B2 (en) * | 2006-06-15 | 2010-12-22 | チエルレエフェ ソチエタ コンソルティレ ペル アチオニ | Fuel injection apparatus for internal combustion engine and method for manufacturing the same |
| KR20180078952A (en) * | 2016-12-30 | 2018-07-10 | 공주대학교 산학협력단 | Plunger return injector of magnetism |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03145564A (en) | 1991-06-20 |
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