JPH07151044A - Cylinder direct injection integrated with ignition plug - Google Patents
Cylinder direct injection integrated with ignition plugInfo
- Publication number
- JPH07151044A JPH07151044A JP5298080A JP29808093A JPH07151044A JP H07151044 A JPH07151044 A JP H07151044A JP 5298080 A JP5298080 A JP 5298080A JP 29808093 A JP29808093 A JP 29808093A JP H07151044 A JPH07151044 A JP H07151044A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- needle
- housing
- insulator
- center
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は筒内直噴エンジンに用い
られる点火プラグ一体型筒内直噴インジェクタに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-cylinder direct injection injector integrated with a spark plug used in a direct injection engine.
【０００２】[0002]
【従来の技術】筒内に直接燃料を噴射する筒内直噴火花
点火エンジンに用いる点火プラグとインジェクタとを一
体化させた点火プラグ一体型筒内直噴インジェクタが開
発されており、例えば実開昭６３−１５４７６０号公報
に記載されたものがある。同公報の点火プラグ一体型筒
内直噴インジェクタは、中心に中央電極を配し、その外
側に密着させてヨークを配設し、さらにこのヨークの外
側に間隙を設けてからハウジングを配設し、前記ヨーク
とハウジングの間に設けられた間隙を通して燃料を軸方
向先端に設けられた噴口に導くものである。2. Description of the Related Art An in-cylinder direct injection injector integrated with an ignition plug has been developed, which is a combination of an ignition plug and an injector used in a direct injection spark ignition engine for injecting fuel directly into the cylinder. There is one described in Japanese Patent Laid-Open No. 63-154760. The spark plug integrated type in-cylinder direct injection injector of the same publication has a central electrode arranged in the center, a yoke is arranged in close contact with the outside thereof, and a housing is arranged after a gap is formed outside the yoke. The fuel is guided to an injection port provided at the tip end in the axial direction through a gap provided between the yoke and the housing.
【０００３】[0003]
【発明が解決しようとする課題】ところで、この様な点
火プラグ一体型筒内直噴インジェクタは、過酷な使用条
件下においても所要の量の燃料を精確に噴射することが
要求され、例えば常に高い同軸度を保つことが重要であ
る。したがって、中心軸の周りに軸対称な構造で形成さ
れていることが望ましい。ところが、前記、実開昭６３
−１５４７６０号公報による点火プラグ一体型筒内直噴
インジェクタでは、中心に中央電極を配し、その外側に
密着させてヨークを配設し、さらにこのヨークの外側に
間隙を設けてからハウジングを配設し、前記ヨークとハ
ウジングの間に設けられた間隙を通して燃料が噴口に導
かれるが、この燃料を噴口に導くためにヨークとハウジ
ングの間に設けられた間隙が中心軸周りに対称に形成さ
れておらず、ある部分ではヨークとハウジングは密着し
ている（図３参照）。したがって、その様な部分で断面
をとって見ると、中心軸の周囲のある範囲では燃料が流
れ、残りの範囲では燃料が流れていないということにな
る。これは燃料の流れる方の側は冷却されるが、燃料の
流れない方の側は冷却されず軸の周囲の温度分布が不均
一となることを意味し、軸の周囲の膨張あるいは縮小が
均等にならず同軸度の悪化を招来し、所要の量の噴射が
できなくなることにつながる。本発明は上記問題に鑑
み、中心軸まわりの温度分布が不均一にならない様に燃
料の流路が形成された点火プラグ一体型筒内直噴インジ
ェクタを提供することを目的とする。By the way, such an in-cylinder direct injection injector integrated with a spark plug is required to accurately inject a required amount of fuel even under severe use conditions, and for example, it is always high. It is important to maintain coaxiality. Therefore, it is desirable to be formed in an axially symmetric structure around the central axis. However, the above-mentioned 63
In the in-cylinder direct injection injector with integrated spark plug according to Japanese Patent Publication No. 154760, a central electrode is arranged at the center, a yoke is arranged in close contact with the outside thereof, and a housing is arranged after a gap is formed outside the yoke. The fuel is guided to the injection port through the gap provided between the yoke and the housing. The gap provided between the yoke and the housing is formed symmetrically about the central axis to guide the fuel to the injection port. The yoke and the housing are in close contact with each other at a certain portion (see FIG. 3). Therefore, when a cross section of such a portion is taken, it means that the fuel flows in a certain range around the central axis and the fuel does not flow in the remaining range. This means that the side where the fuel flows is cooled, but the side where the fuel does not flow is not cooled and the temperature distribution around the shaft becomes non-uniform, and the expansion or contraction around the shaft is uniform. However, the coaxiality is deteriorated and the required amount of injection cannot be performed. In view of the above problems, it is an object of the present invention to provide an in-cylinder direct injection injector integrated with a spark plug in which a fuel flow path is formed so that the temperature distribution around the central axis does not become uneven.
【０００４】[0004]
【課題を解決するための手段】本発明によれば、半径方
向の最中心に軸方向の先端に設けられた中心電極に接続
する導電体を配し、該中心電極の半径方向外側に密接し
て絶縁体を配設し、さらに該絶縁体の半径方向外側に間
隙を設けて外筒を配設し、前記絶縁体と前記外筒との間
に設けられた前記間隙は中心軸に軸対称な断面とし、こ
れを噴射口に燃料を導く燃料通路としたことを特徴とす
る点火プラグ一体型筒内直噴インジェクタが提供され
る。According to the present invention, a conductor for connecting to a center electrode provided at the tip in the axial direction is arranged at the center in the radial direction, and the conductor is closely contacted to the outside in the radial direction of the center electrode. An insulator, and an outer cylinder with a gap radially outside the insulator. The gap provided between the insulator and the outer cylinder is axisymmetric with respect to the central axis. An in-cylinder direct injection injector integrated with a spark plug is provided, which has a different cross section and is a fuel passage for guiding fuel to an injection port.
【０００５】[0005]
【作用】絶縁体と外筒との間に設けられた中心軸に軸対
称な断面の間隙に、噴射口に導かれる燃料が流されるの
で中心軸の周囲の温度分布が均一化され同軸度が損なわ
れない。The fuel guided to the injection port is flown into the gap between the insulator and the outer cylinder, the cross section being axially symmetric with respect to the central axis, so that the temperature distribution around the central axis is made uniform and the coaxiality is improved. Not damaged.
【０００６】[0006]
【実施例】以下添付図面を用いて本発明の実施例を説明
する。図１は本発明による点火プラグ一体型筒内直噴イ
ンジェクタの構造を示す図である。図において、１は点
火プラグ一体型筒内直噴インジェクタの全体を示す。２
は高圧配電線であり、一方の端部は図示されない配電器
に接続され、他方の端部が導電性材料で作られた第１導
電体３に接続されている。第１導電体３の高圧配電線２
に接続されていない方の端部は導電性材料で作られた筒
状の第２導電体４の一方の端部に挿入されて接続されて
いる。第２導電体４の他方の端部には導電性材料で作ら
れたアジャスティングバー５の一方の端部が挿入されて
接続されている。アジャスティングバー５は後述の第２
絶縁体１２の内周に密着されたアジャスティングパイプ
５ａの内部に配設され、位置決め後にアジャスティング
パイプ５ａをかしめることによって軸方向の位置が固定
される。アジャスティングバー５の他方の端部は導電性
材料で作られたリターンスプリング６の一方の端部を押
圧して接している。リターンスプリング６の他方の端部
は導電性材料で作られたニードル７を押圧して接してい
る。ニードル７は導電性材料で作られたニードルハウジ
ング８の内部に摺接している。ニードルハウジング８の
先端には中心電極９が設けられている。該中心電極９の
中央には燃料を噴出するための噴口９ａが設けられてい
る。１１は第１絶縁体、１２は第２絶縁体、１３は第３
絶縁体、１４は位置決め用の第４絶縁体、１５は第５絶
縁体であって、中心部に配設され高電圧が流れる第１導
電体３、第２導電体４、アジャスティングバー５、リタ
ーンスプリング６、ニードル７、ニードルハウジング８
と、外側に配設されそれぞれ導電性の金属で作られた第
１筒体２１、フランジ付き第２筒体２２、シム２３、ス
プール２４、カラー２５、第３筒体２６、燃料通路配設
部材２７、第１ハウジング２８、第２ハウジング２９と
の間を電気的に絶縁している。なお、第２ハウジング２
９の先端部は中心電極９を取り巻くような形に成形され
接地電極１０が形成されている。３０は電磁コイルであ
って、コイル用コード３１によって電流が流されると励
磁してニードル７を動かし、それによって燃料が噴口９
ａから噴出される。４０は連結部材であって、第１筒体
２１と、第１ハウジング２８の拡大された端部の間に嵌
入され軸回りの回転方向の位置決め後にナット４１によ
って固定される。また連結部材４０はコイル用コード３
１の外部との接続部分４２と、外部の燃料パイプとの接
続部分４３とを有し、該接続部分４３から導入された燃
料を第１筒体２１と、第１ハウジング２８の間に設けら
れた燃料流路に導く内部通路４４を有する。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing the structure of an in-cylinder direct injection injector integrated with a spark plug according to the present invention. In the figure, reference numeral 1 shows the whole of a spark plug integrated type in-cylinder direct injection injector. Two
Is a high-voltage distribution line, one end of which is connected to a distributor (not shown) and the other end of which is connected to a first conductor 3 made of a conductive material. High voltage distribution line 2 of the first conductor 3
The end that is not connected to is inserted into and connected to one end of the cylindrical second conductor 4 made of a conductive material. One end of an adjusting bar 5 made of a conductive material is inserted and connected to the other end of the second conductor 4. The adjusting bar 5 is the second described below.
It is disposed inside the adjusting pipe 5a that is in close contact with the inner circumference of the insulator 12, and the position in the axial direction is fixed by caulking the adjusting pipe 5a after positioning. The other end of the adjusting bar 5 presses and contacts one end of a return spring 6 made of a conductive material. The other end of the return spring 6 presses and contacts a needle 7 made of a conductive material. The needle 7 is in sliding contact with the inside of a needle housing 8 made of a conductive material. A center electrode 9 is provided at the tip of the needle housing 8. An injection port 9 a for ejecting fuel is provided at the center of the center electrode 9. 11 is a first insulator, 12 is a second insulator, and 13 is a third insulator.
An insulator, 14 is a fourth insulator for positioning, and 15 is a fifth insulator. The first conductor 3, the second conductor 4, the adjusting bar 5, which are arranged in the center and through which high voltage flows, Return spring 6, needle 7, needle housing 8
A first cylinder 21, a second cylinder 22 with a flange, a shim 23, a spool 24, a collar 25, a third cylinder 26, and a fuel passage disposing member, which are disposed outside and are each made of a conductive metal. 27, the first housing 28, and the second housing 29 are electrically insulated. The second housing 2
A tip portion of 9 is shaped to surround the center electrode 9 and a ground electrode 10 is formed. Reference numeral 30 denotes an electromagnetic coil, which is excited when a current is supplied by the coil cord 31 to move the needle 7, whereby fuel is injected into the injection port 9
It is ejected from a. Reference numeral 40 denotes a connecting member, which is fitted between the first cylindrical body 21 and the enlarged end portion of the first housing 28 and fixed by the nut 41 after positioning in the rotation direction around the axis. The connecting member 40 is the coil cord 3
1 has a connecting portion 42 with the outside and a connecting portion 43 with the external fuel pipe, and the fuel introduced from the connecting portion 43 is provided between the first tubular body 21 and the first housing 28. And an internal passage 44 leading to the fuel flow path.
【０００７】以上が、本発明の基本的な構成であるが、
本実施例では、さらに以下の様な工夫が盛り込まれ、性
能の安定を図っている。第１は組付け精度の向上のため
の工夫であって、図２に示されるが、以下の手順で行う
ことによって精度の向上を図っている。 （１）先ず第５絶縁体１５に、燃料シールのためのＯリ
ング５１を組み付けたニードルハウジング８をネジ部Ｓ
で螺合する、なお、この作業は、ニードルハウジング８
の頂部に設けられた内６角部を６角スパナを使用して回
転させることによって行われ、テーパ状の対向部Ｔ1 に
はガスシール６１が組み込まれる。 （２）次に、第２ハウジング２９にニードルハウジング
８が組み付けられた第５絶縁体１５を組付ける。この時
第５絶縁体１５と第２ハウジング２９はＦ部で精度良く
接する様にするが、これはＯリング５２のシール機能を
十分に果たさせるためと、第５絶縁体１５と第２ハウジ
ング２９の同軸度を径の大きい所で合わせるという点で
意味がある。また、テーパ状の対向部Ｔ2 には、Ｔ1 と
同様にガスシール６２が組み込まれる。 （３）次に、第５絶縁体１５の凹部に位置決め用の第４
絶縁体１４を載置し、その上に、さらに燃料通路配設部
材２７を載置してから第２ハウジング２９の上端縁を内
側に変形させることによってかしめ、これで、先端に中
心電極９を有するニードルハウジング８と、第５絶縁体
１５と、位置決め用の第４絶縁体１４と、燃料通路配設
部材２７と第２ハウジング２９が組上がった状態とな
る。ここで、位置決め用の第４絶縁体１４と第５絶縁体
１５とはＧ部、Ｈ部で接し、位置決め用の第４絶縁体１
４と燃料通路配設部材２７とはＩ部、Ｊ部で接し組付け
精度を出す様にしている。 （４）上記の様に組み上げられた状態でもニードルハウ
ジング８と、第５絶縁体１５との螺合部や、各部品の寸
法誤差の積み重ねによって中心電極９と燃料通路配設部
材２７との同軸度は不十分であるため、燃料通路配設部
材２７の内径を基準にニードルハウジング８の内径部の
シート部の円筒加工、研磨を行って同軸度を出す。 （５）そして、ニードル７を組付けるがニードル７は第
３絶縁体１３、カラー２５と一体構造となっている。カ
ラー２５と燃料通路配設部材２７とは接しているのでカ
ラー２５とニードル７はニードル組み立て体として同軸
度が出ている必要があるものである。The above is the basic configuration of the present invention.
In this embodiment, the following measures are further incorporated to stabilize the performance. The first is a device for improving the assembling accuracy, which is shown in FIG. 2. The accuracy is improved by performing the following procedure. (1) First, attach the needle housing 8 in which the O-ring 51 for fuel sealing is assembled to the fifth insulator 15 to the threaded portion S.
It is screwed in with the needle housing 8
This is performed by rotating the inner hexagonal portion provided on the top of the element using a hexagonal wrench, and the gas seal 61 is incorporated in the tapered opposing portion T 1 . (2) Next, the fifth insulator 15 having the needle housing 8 assembled therein is assembled to the second housing 29. At this time, the fifth insulator 15 and the second housing 29 are brought into contact with each other at the F portion with high precision. This is because the sealing function of the O-ring 52 is sufficiently fulfilled. It is significant in that the coaxiality of 29 is adjusted at a large diameter. Further, the gas seal 62 is incorporated in the tapered facing portion T 2 as in the case of T 1 . (3) Next, in the concave portion of the fifth insulator 15, a fourth positioning member is provided.
The insulator 14 is placed, the fuel passage disposing member 27 is further placed thereon, and then the upper end edge of the second housing 29 is deformed inward to be caulked, whereby the center electrode 9 is attached to the tip. The needle housing 8 included therein, the fifth insulator 15, the fourth insulator 14 for positioning, the fuel passage arrangement member 27, and the second housing 29 are assembled. Here, the positioning fourth insulator 14 and the fifth insulator 15 are in contact with each other at the G portion and the H portion, and the positioning fourth insulator 1
4 and the fuel passage disposing member 27 are in contact with each other at the I portion and the J portion so that the assembling accuracy is improved. (4) Even when assembled as described above, the center portion of the center electrode 9 and the fuel passage disposing member 27 are coaxial due to the threaded portion of the needle housing 8 and the fifth insulator 15 and the stacking of dimensional errors of each component. Since the degree is insufficient, the seat portion of the inner diameter portion of the needle housing 8 is cylindrically worked and polished based on the inner diameter of the fuel passage disposing member 27 to obtain the coaxiality. (5) Then, the needle 7 is assembled, but the needle 7 is integrated with the third insulator 13 and the collar 25. Since the collar 25 and the fuel passage disposing member 27 are in contact with each other, the collar 25 and the needle 7 need to be coaxial as a needle assembly.
【０００８】第２は磁気の逃げの防止のための工夫であ
って、電磁コイル３０の周囲のカラー２５、フランジ付
き第２筒体２２、第３筒体２６は主に鉄系の磁性体で作
り、電磁コイル３０の周りに閉磁路を形成する。これに
よって、磁気を強くするとともに構造をコンパクトにし
ている。そして、上記の３部材に接触している燃料通路
配設部材２７と第１筒体２１をステンレススチール等の
非磁性体材料で作ることによって第３筒体２６やカラ−
２５→燃料通路配設部材２７→第２ハウジング２９→シ
リンダヘッド（図示しない）、あるいは第３筒体２６→
第１筒体２１の様に磁気が逃げていくのを防いでいる。
これは、特に第２ハウジング２９が点火プラグのアース
でもあるので点火系の電気系とインジェクタの電気系を
分離し、各々の信頼性、性能を保つ上でも重要なことで
ある。The second is a device for preventing escape of magnetism. The collar 25 around the electromagnetic coil 30, the second cylindrical body 22 with a flange, and the third cylindrical body 26 are mainly iron-based magnetic materials. A closed magnetic circuit is formed around the electromagnetic coil 30. This strengthens magnetism and makes the structure compact. Then, the fuel passage disposing member 27 and the first tubular body 21 that are in contact with the above-mentioned three members are made of a non-magnetic material such as stainless steel, so that the third tubular body 26 and the color body are colored.
25 → fuel passage arrangement member 27 → second housing 29 → cylinder head (not shown), or third cylinder 26 →
It prevents the magnetism from escaping like the first cylinder 21.
This is particularly important in order to separate the electric system of the ignition system and the electric system of the injector from each other because the second housing 29 is also the ground of the ignition plug, and to maintain the reliability and performance of each.
【０００９】第３は噴射量調整のための工夫であって、
これはニードルハウジング８に対するニードル７の押圧
力を適正に保つためにリターンスプリング６の付勢力を
調整するもので、本発明によれば周辺部材の第１絶縁体
１１や第２絶縁体１２が非金属性の材料で形成されてい
るためにリターンスプリング６を押圧するアジャスティ
ングバー５を直接にかしめることができないので、第２
絶縁体１２にアジャスティングパイプ５ａを一体的に密
着させておいて、該アジャスティングパイプ５ａの中に
アジャスティングバー５を予め入れておき、それを移動
させてリターンスプリング６の付勢力が適切になる様に
位置決めしてアジャスティングパイプのＸ部でかしめ
る。The third is a device for adjusting the injection amount,
This adjusts the urging force of the return spring 6 in order to keep the pressing force of the needle 7 against the needle housing 8 properly. According to the present invention, the first insulator 11 and the second insulator 12 of the peripheral members are not Since the adjusting bar 5 for pressing the return spring 6 cannot be directly caulked because it is made of a metallic material, the second
The adjusting pipe 5a is brought into close contact with the insulator 12 integrally, and the adjusting bar 5 is previously put in the adjusting pipe 5a, and the adjusting bar 5 is moved so that the urging force of the return spring 6 is appropriately adjusted. And position it so that it is crimped at the X part of the adjusting pipe.
【００１０】第４は燃焼圧に対する強度向上のための工
夫であって、ニードルハウジング８を第５絶縁体１５に
ネジ止めで一体化したが、ここに接着剤を入れて固める
ことによってさらに強度を増すことができる。また、燃
焼圧の荷重をＪ部、Ｈ部の大きい面で受け、かしめをＡ
部の外周の大きい所で行うことによってかしめ部の単位
面積当たりの荷重を減らし、強度的に有利にした。The fourth is a device for improving the strength against the combustion pressure, in which the needle housing 8 is integrated with the fifth insulator 15 by screwing, and the strength is further increased by putting an adhesive here and hardening it. Can be increased. In addition, the load of combustion pressure is received by the large surface of J part and H part, and caulking is A
The load per unit area of the caulking portion was reduced by making it performed at a large outer circumference of the portion, which was advantageous in terms of strength.
【００１１】次に、上記の様な工夫を含めて構成された
本装置の作動について説明する。本装置は点火プラグと
しての作動と、燃料噴射弁としての作動をするが始めに
燃料噴射弁としての作動を説明する。外部の燃料パイプ
を通って供給された燃料は連結部材４０の接続部分４３
より本装置の内部に入り、まず連結部材４０の内部通路
４４を通り、次に第１筒体２１と第１ハウジング２８の
間の流路を通り、次に該第１筒体２１と第１ハウジング
２８の間の流路に連続した第３筒体２６と第１ハウジン
グ２８の間の流路を通り、燃料通路配設部材２７の外側
に達する。燃料通路配設部材２７の外側に達した燃料は
該燃料通路配設部材２７の外側と内側を貫通して設けら
れている燃料通路を通って燃料通路配設部材２７の内側
に流れ込み、続いて第３絶縁体１３と、位置決め用の第
４絶縁体１４の間の隙間を通って，ニードル７のシャフ
ト７ａと中間ガイド７ｂの上面と第３絶縁体１３の底面
およびニードルハウジング８とで画定される部分に達す
る、中間ガイド７ｂはニードルハウジング８の内周面が
円形断面であるのに対して四辺形であるので、前記部分
に達した燃料は中間ガイド７ｂとニードルハウジング８
の内周面との隙間を通って、ニードル７のシャフト７ａ
と中間ガイド７ｂの下面とニードル７の先端部７ｃの上
面およびニードルハウジング８とで画定される部分に達
する。Next, the operation of the present apparatus constructed by including the above-mentioned measures will be described. The present device operates as a spark plug and as a fuel injection valve. First, the operation as a fuel injection valve will be described. The fuel supplied through the external fuel pipe is connected to the connecting portion 43 of the connecting member 40.
More inside the device, first through the internal passage 44 of the connecting member 40, then through the flow path between the first tubular body 21 and the first housing 28, then the first tubular body 21 and the first tubular body 21. It passes through the flow path between the third cylindrical body 26 and the first housing 28, which is continuous with the flow path between the housings 28, and reaches the outside of the fuel passage arrangement member 27. The fuel that has reached the outside of the fuel passage arrangement member 27 flows into the inside of the fuel passage arrangement member 27 through the fuel passage that penetrates the outside and the inside of the fuel passage arrangement member 27, and It is defined by the shaft 7 a of the needle 7, the upper surface of the intermediate guide 7 b, the bottom surface of the third insulator 13, and the needle housing 8 through a gap between the third insulator 13 and the positioning fourth insulator 14. The inner guide surface of the intermediate housing 7b reaching the corresponding portion has a quadrilateral shape while the inner peripheral surface of the needle housing 8 has a circular cross section.
Shaft 7a of needle 7 through the gap with the inner peripheral surface of
And a portion defined by the lower surface of the intermediate guide 7b, the upper surface of the tip portion 7c of the needle 7 and the needle housing 8.
【００１２】ここで、ニードル７の先端部７ｃの内部に
は上面と円錐状に仕上げられた下面とを貫通する斜めの
孔７ｄが設けられているが、電磁コイル３０に通電され
ていない時には、ニードル７の先端部７ｃの下側の円錐
状に仕上げられたその頂部が、ニードルハウジング８の
内側の底部に形成された前記ニードル７の先端部７ｃの
下側に形成された円錐よりも鈍角に形成された逆円錐の
中央に設けられた孔に入り込むようにされているので、
燃料は前記ニードル７の先端部７ｃの内部の貫通する斜
めの孔７ｄを通り前記ニードル７の先端部７ｃの下側の
円錐面とニードルハウジング８の内側の底部に形成され
た円錐面との間の隙間にまで達するがそこで停止され
る。ニードルハウジング８の内側の底部に形成された前
記ニードル７の先端部７ｃの下側に形成された円錐より
も鈍角に形成された逆円錐の中央に設けられた孔の下方
には燃焼室（図示されない）に通ずる噴口９ａが設けら
れているので、電磁コイル３０に通電されてニードル７
全体が上方に引き上げられ、ニードル７の円錐状の下面
の頂部が閉じていたニードルハウジング８の内側の底部
に形成された前記ニードル７の先端部７ｃの下側に形成
された円錐よりも鈍角に形成された逆円錐の中央に設け
られた孔が開かれると燃料は噴口９ａを通って燃焼室に
噴出される。Here, an oblique hole 7d penetrating the upper surface and the conical lower surface is provided inside the tip portion 7c of the needle 7, but when the electromagnetic coil 30 is not energized, The top of the needle 7, which is formed into a conical shape below the tip 7c of the needle 7, has an obtuse angle than the cone formed below the tip 7c of the needle 7 formed at the inner bottom of the needle housing 8. Since it is designed to enter the hole provided in the center of the formed inverted cone,
The fuel passes through an oblique hole 7d that penetrates inside the tip portion 7c of the needle 7, and between the lower conical surface of the tip portion 7c of the needle 7 and the conical surface formed on the inner bottom portion of the needle housing 8. It reaches the gap of, but is stopped there. A combustion chamber (shown in the figure) is provided below a hole provided at the center of an inverted cone formed at an obtuse angle with respect to a cone formed below the tip 7c of the needle 7 formed at the inner bottom of the needle housing 8. Since the injection port 9a leading to the needle 7 is provided, the electromagnetic coil 30 is energized and the needle 7
The whole is pulled up, and the cone 7 has an obtuse angle than the cone formed under the tip 7c of the needle 7 formed on the inner bottom of the needle housing 8 whose top is closed on the lower surface. When the hole provided at the center of the formed inverted cone is opened, the fuel is ejected into the combustion chamber through the injection port 9a.
【００１３】次に、点火プラグとしての作動を説明する
が、配電器から高圧電線２を通って伝えられた高圧電流
は第１導電体３、第２導電体４、アジャスティングバー
５、リターンスプリング６、ニードル７、ニードルハウ
ジング８を経てニードルハウジング８の先端部に配設さ
れた中心電極９に達する。中心電極９の回りにはそれを
取り巻くような形に成形され接地電極１０が形成されて
いるので中心電極９と接地電極１０との間で火花放電が
発生する。Next, the operation of the spark plug will be described. The high-voltage current transmitted from the distributor through the high-voltage electric wire 2 is the first conductor 3, the second conductor 4, the adjusting bar 5, the return spring. 6, the needle 7, and the needle housing 8 to reach the center electrode 9 arranged at the tip of the needle housing 8. Since the ground electrode 10 is formed around the center electrode 9 so as to surround the center electrode 9, spark discharge is generated between the center electrode 9 and the ground electrode 10.
【００１４】[0014]
【発明の効果】本発明は、上記の様に構成され作用する
ので、外部の燃料パイプを通って供給された燃料は、前
記外部の燃料パイプおよび外部電源との接続を行う連結
部材４０の部分を含めて、その先、最終的に噴口９ａか
ら排出されるまで中心軸周りに軸対称に形成された燃料
の通路を通っていくので均一に冷却が行われ熱による歪
みの発生が防止され燃料の噴射を正確におこなうことが
できる。Since the present invention is constructed and operates as described above, the fuel supplied through the external fuel pipe is connected to the external fuel pipe and the external power source. In addition, since the fuel passes through the fuel passage formed axially symmetrically around the central axis until it is finally discharged from the injection port 9a, uniform cooling is performed and distortion due to heat is prevented from occurring. Can be accurately injected.
【図１】本発明による点火プラグ一体型筒内直噴インジ
ェクタの内部構造を示す断面図である。FIG. 1 is a cross-sectional view showing the internal structure of a spark plug-integrated in-cylinder direct injection injector according to the present invention.
【図２】図１の下側の部分の詳細を示す図である。FIG. 2 is a diagram showing details of a lower portion of FIG.
【図３】従来技術による点火プラグ一体型筒内直噴イン
ジェクタの構造を示す図である。FIG. 3 is a view showing a structure of a spark plug integrated type in-cylinder direct injection injector according to a conventional technique.
１…点火プラグ一体型筒内直噴インジェクタ ２…高圧配電線 ３…第１導電体（中心電極の導電路） ４…第２導電体（中心電極の導電路） ５…アジャスティングバー（中心電極の導電路） ５ａ…アジャスティングパイプ（中心電極の導電路） ６…リターンスプリング（中心電極の導電路） ７…ニードル（中心電極の導電路） ８…ニードルハウジング（中心電極の導電路） ９…中心電極 ９ａ…噴口 １０…接地電極 １１…第１絶縁体 １２…第２絶縁体 １３…第３絶縁体 １４…位置決め用の第４絶縁体 １５…第５絶縁体 ２１…第１筒体（金属製） ２２…フランジ付き第２筒体（金属製） ２４…スプール（金属製） ２５…カラー（金属製） ２６…第３筒体（金属製） ２７…燃料通路配設部材（金属製） ２８…第１ハウジング（金属製） ２９…第２ハウジング（金属製） ３０…電磁コイル（金属製） ４０…連結部材（金属製） ５１…オイルシール ５２…オイルシール ６１…ガスシール ６２…ガスシール Ｓ…ネジ部 Ｔ1 …テーパ部 Ｔ2 …テーパ部DESCRIPTION OF SYMBOLS 1 ... In-cylinder direct-injection injector with integrated spark plug 2 ... High-voltage distribution line 3 ... First conductor (conduction path of center electrode) 4 ... Second conductor (conduction path of center electrode) 5 ... Adjusting bar (center electrode) 5a ... Adjusting pipe (conducting path of center electrode) 6 ... Return spring (conducting path of center electrode) 7 ... Needle (conducting path of center electrode) 8 ... Needle housing (conducting path of center electrode) 9 ... Central electrode 9a ... Injection port 10 ... Ground electrode 11 ... First insulator 12 ... Second insulator 13 ... Third insulator 14 ... Positioning fourth insulator 15 ... Fifth insulator 21 ... First cylinder (metal) 22 ... Flanged second cylinder (metal) 24 ... Spool (metal) 25 ... Collar (metal) 26 ... Third cylinder (metal) 27 ... Fuel passage arrangement member (metal) 28 … First housing (made of metal) 9 ... second housing (metal) 30 ... electromagnetic coil (metal) 40 ... connecting member (metal) 51 ... oil seal 52 ... oil seal 61 ... gas seal 62 ... gas seal S ... screw portion T 1 ... taper portion T 2 ... tapered portion
Claims (1)
られた中心電極に接続する導電体を配し、該導電体の半
径方向外側に密接して絶縁体を配設し、さらに該絶縁体
の半径方向外側に間隙を設けて外筒を配設し、前期絶縁
体と前期外筒との間に設けられた前記間隙は中心軸に対
して軸対称な断面とし、これを軸方向の先端に設けられ
た中心電極の中心に配設された噴射口に燃料を導く燃料
通路としたことを特徴とする点火プラグ一体型筒内直噴
インジェクタ。1. A conductor, which is connected to a center electrode provided at the tip in the axial direction, is arranged at the most radial center, and an insulator is arranged in close contact with the outside of the conductor in the radial direction. An outer cylinder is arranged with a gap provided on the outer side in the radial direction of the insulator, and the gap provided between the former insulator and the former casing has an axially symmetrical cross section with respect to the central axis. An in-cylinder direct injection injector integrated with a spark plug, characterized in that it is a fuel passage for guiding fuel to an injection port provided at the center of a center electrode provided at the tip of the.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5298080A JP2897620B2 (en) | 1993-11-29 | 1993-11-29 | In-cylinder direct injection injector with integrated spark plug |
| EP94118724A EP0661446B1 (en) | 1993-11-29 | 1994-11-28 | A fuel injector with an integrated spark plug for a direct injection type engine |
| US08/345,186 US5497744A (en) | 1993-11-29 | 1994-11-28 | Fuel injector with an integrated spark plug for a direct injection type engine |
| DE69410582T DE69410582T2 (en) | 1993-11-29 | 1994-11-28 | Fuel injection device with integrated spark plug for engine with direct injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5298080A JP2897620B2 (en) | 1993-11-29 | 1993-11-29 | In-cylinder direct injection injector with integrated spark plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07151044A true JPH07151044A (en) | 1995-06-13 |
| JP2897620B2 JP2897620B2 (en) | 1999-05-31 |
Family
ID=17854898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5298080A Expired - Fee Related JP2897620B2 (en) | 1993-11-29 | 1993-11-29 | In-cylinder direct injection injector with integrated spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2897620B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101048124B1 (en) * | 2008-06-16 | 2011-07-08 | 기아자동차주식회사 | Spark Plug Tube Unit for Engine |
| CA2810500A1 (en) * | 2009-12-07 | 2011-06-16 | Mcalister Technologies, Llc | Integrated fuel injector igniters suitable for large engine applications and associated methods of use and manufacture |
-
1993
- 1993-11-29 JP JP5298080A patent/JP2897620B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2897620B2 (en) | 1999-05-31 |
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| LAPS | Cancellation because of no payment of annual fees |