JPH085333Y2 - Electromagnetic fuel injection valve for internal combustion engine - Google Patents
Electromagnetic fuel injection valve for internal combustion engineInfo
- Publication number
- JPH085333Y2 JPH085333Y2 JP1990034197U JP3419790U JPH085333Y2 JP H085333 Y2 JPH085333 Y2 JP H085333Y2 JP 1990034197 U JP1990034197 U JP 1990034197U JP 3419790 U JP3419790 U JP 3419790U JP H085333 Y2 JPH085333 Y2 JP H085333Y2
- Authority
- JP
- Japan
- Prior art keywords
- injection hole
- nozzle body
- fuel injection
- internal combustion
- combustion engine
- 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
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 本考案は内燃機関の電磁式燃料噴射弁に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electromagnetic fuel injection valve for an internal combustion engine.
〈従来の技術〉 内燃機関の電磁式燃料噴射弁の従来例として第４図及
び第５図に示すようなものがある。<Prior Art> As a conventional example of an electromagnetic fuel injection valve for an internal combustion engine, there is one as shown in FIGS. 4 and 5.
すなわち、ハウジング１の先端部にはノズルボディ２
が保持され、ノズルボディ２にはニードルバブル３が嵌
挿されている。前記ノズルボディ２は合成樹脂製のプロ
テクタ４により覆われ、ノズルボディ２の先端部には円
筒状の噴孔５が形成されている。前記ノズルボディ２の
先端部には円錐状のシート部2Aが形成され、このシート
部2Aにはニードルバブル３先端の円錐状のシート部3Aが
着座して閉弁されている。That is, the nozzle body 2 is attached to the tip of the housing 1.
Is held, and the needle bubble 3 is inserted into the nozzle body 2. The nozzle body 2 is covered with a protector 4 made of synthetic resin, and a cylindrical injection hole 5 is formed at the tip of the nozzle body 2. A conical seat portion 2A is formed at the tip of the nozzle body 2, and a conical seat portion 3A at the tip of the needle bubble 3 is seated and closed on the seat portion 2A.
前記ニードルバブル３の先端部には第５図に示すよう
にピントル部６がノズルボディ２の外方に突出して形成
されている。このピントル部６は、前記噴孔５と略一定
の間隙７を有する円筒部と、該円筒部先端部に取付けら
れるくびれ部と、から構成されている。As shown in FIG. 5, a pintle portion 6 is formed at the tip of the needle bubble 3 so as to project to the outside of the nozzle body 2. The pintle portion 6 is composed of a cylindrical portion having a substantially constant gap 7 with the injection hole 5 and a constricted portion attached to the tip portion of the cylindrical portion.
そして、電磁コイル８の吸引力によりアンカー９を介
してニードルバブル３を図中上方にリフトさせて開弁さ
せ、燃料供給通路10から供給された燃料を噴孔５から噴
射するようになっている。余剰燃料はリターン通路11及
びフィルタ12を介して燃料タンク（図示せず）に戻され
るようになっている。Then, the suction force of the electromagnetic coil 8 lifts the needle bubble 3 upward through the anchor 9 to open the valve, and the fuel supplied from the fuel supply passage 10 is injected from the injection hole 5. . Excess fuel is returned to a fuel tank (not shown) via the return passage 11 and the filter 12.
〈考案が解決しようとする課題〉 しかしながら、このような従来の電磁式燃料噴射弁に
おいては、ピントル部６がノズルボディ２から突出形成
されているので、燃焼室から吹返される排気がピントル
部６先端部にデポジットとして付着するため、噴射抵抗
が増大して燃料噴射量が低下するという不具合がある。<Problems to be Solved by the Invention> However, in such a conventional electromagnetic fuel injection valve, since the pintle portion 6 is formed so as to project from the nozzle body 2, the exhaust gas blown back from the combustion chamber is discharged. Since it adheres to the tip as a deposit, there is a problem that the injection resistance increases and the fuel injection amount decreases.
本考案は、このような実状に鑑みてなされたもので、
デポジットの付着を防止しつつ最適な噴霧パターンを確
保できる電磁式燃料噴射弁を提供することを目的とす
る。The present invention has been made in view of such a situation,
An object of the present invention is to provide an electromagnetic fuel injection valve capable of ensuring an optimum spray pattern while preventing deposits from adhering.
〈課題を解決するための手段〉 このため、本考案は、ノズルボディの先端部に形成さ
れた噴孔内壁を所定間隙を設けて前記噴孔内に先端面が
ノズルボディ先端面より噴孔内に位置するように配置さ
れる筒状のピントル部を、前記ニードルバルブの先端部
に形成し、かつ前記噴射孔の外方を所定の空間部を介し
て覆うプロテクタを前記ノズルボディに取付けると共
に、前記プロテクタに前記空間部と外方とを連通するガ
イド孔を形成することにした。<Means for Solving the Problem> Therefore, according to the present invention, the inner wall of the nozzle hole formed at the tip of the nozzle body is provided with a predetermined gap so that the tip surface is inside the nozzle hole from the tip surface of the nozzle body. A cylindrical pintle portion arranged so as to be positioned at, is formed at the tip end portion of the needle valve, and a protector that covers the outside of the injection hole via a predetermined space portion is attached to the nozzle body, A guide hole is formed in the protector to connect the space and the outside.
〈作用〉 このようにして、噴孔を所定の空間部を設けてプロテ
クタにより覆い、噴孔から噴射された燃料をプロテクタ
に衝突させた後ガイド孔から外方に流出させる。また、
噴孔内にピントル部を設けて流量調整機能を確保できる
ようにした。<Operation> In this way, the injection hole is provided with a predetermined space and covered with the protector, and the fuel injected from the injection hole is made to collide with the protector and then flowed outward from the guide hole. Also,
A pintle part was provided in the injection hole so that the flow rate adjusting function could be ensured.
〈実施例〉 以下に、本考案の一実施例を第１図及び第２図に基づ
いて説明する。尚、全体構成は従来例と大略同様である
ので、要部のみを説明し、また従来例と同一要素には第
４図及び第５図と同一符号を付して説明を省略する。<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. Since the overall configuration is almost the same as that of the conventional example, only the essential parts will be described, and the same elements as those of the conventional example will be denoted by the same reference numerals as in FIGS. 4 and 5 and will not be described.
第１図において、ニードルバルブ21の先端部には円筒
状のピントル部22が形成され、ピントル部22の先端面は
ノズルボディ５の先端面と略面一になっている。前記ピ
ントル部22外周壁と噴孔５内周壁とにより所定の間隙23
が形成されている。In FIG. 1, a cylindrical pintle portion 22 is formed at the tip of the needle valve 21, and the tip surface of the pintle portion 22 is substantially flush with the tip surface of the nozzle body 5. A predetermined gap 23 is formed by the outer peripheral wall of the pintle portion 22 and the inner peripheral wall of the injection hole 5.
Are formed.
また、前記ノズルボディ５の外周部は合成樹脂製のプ
ロテクタ24により覆われ前記噴孔５の外方に所定の空間
部25が形成されている。前記プロテクタ24の先端部には
複数のガイド孔26が第２図に示すように前記噴孔５の中
心軸延長線の軸回りに前記噴孔５の先端部と外部とを連
通するように貫通形成されている。前記各ガイド孔26
は、外部になるに従って前記延長線から離間するように
傾斜されていると共に、周方向に所定角度を持って傾斜
されている。Further, the outer peripheral portion of the nozzle body 5 is covered with a protector 24 made of synthetic resin, and a predetermined space portion 25 is formed outside the injection hole 5. As shown in FIG. 2, a plurality of guide holes 26 are formed at the tip of the protector 24 so as to communicate the tip of the injection hole 5 with the outside around the axis of the central axis extension line of the injection hole 5. Has been formed. Each guide hole 26
Is inclined so as to be separated from the extension line as it becomes outside, and is inclined at a predetermined angle in the circumferential direction.
かかる構成によれば、電磁コイル（図示せず）によりニ
ードルバルブ21がリフトされてニードルバルブ21のシー
ト部21Aがノズルボディ２のシート部2Aから離間する
と、燃料は前記間隙23を通過する。そして、通過した燃
料の一部は空間部25,ガイド孔26に直接導入された後外
部に拡散するように流出し、また燃料の一部はプロテク
タ24内壁に衝突して霧化された後ガイド孔26から外部に
拡散するように流出する。このため、くびれ部を設けた
従来のものと略同様な噴霧性状及び噴霧パターンを確保
できる。With this configuration, when the needle valve 21 is lifted by the electromagnetic coil (not shown) and the seat portion 21A of the needle valve 21 is separated from the seat portion 2A of the nozzle body 2, the fuel passes through the gap 23. Then, a part of the fuel that has passed is directly introduced into the space 25 and the guide hole 26 and then flows out so as to diffuse to the outside, and a part of the fuel collides with the inner wall of the protector 24 and is atomized and then guided. It flows out from the hole 26 so as to diffuse to the outside. Therefore, it is possible to secure a spray property and a spray pattern that are substantially the same as those of the conventional one having the constricted portion.
また、噴孔５及びピントル部22をプロテクタ24により
覆うようにし且つピントル部の先端面はノズルボディの
先端面よりも内方に位置させたので、燃焼室から吹返さ
れる排気がピントル部22に付着するのを防止できるた
め、デポジットによる燃料噴射量の低下を防止でき、も
って空燃比のリターン化によるエミッション，エンジン
性能の悪化を防止できる。Further, since the nozzle hole 5 and the pintle portion 22 are covered with the protector 24 and the tip end surface of the pintle portion is located inward of the tip end surface of the nozzle body, the exhaust gas blown back from the combustion chamber reaches the pintle portion 22. Since the adhesion can be prevented, it is possible to prevent a decrease in the fuel injection amount due to the deposit, and thus to prevent the emission and the engine performance from being deteriorated due to the return of the air-fuel ratio.
さらに、噴孔５内にピントル部22を配設して所定の間
隙23を形成するようにしたので、前記間隙23の寸法を調
整することにより燃料噴射量を従来例と同様に調整でき
る。また、従来の燃料噴射弁の構造を大きく変更しない
ので、従来の製造設備を流用できる。Further, since the pintle portion 22 is arranged in the injection hole 5 to form the predetermined gap 23, the fuel injection amount can be adjusted by adjusting the size of the gap 23 as in the conventional example. Further, since the structure of the conventional fuel injection valve is not significantly changed, the conventional manufacturing equipment can be used.
第３図はプロテクタ31に形成するガイド孔32を噴孔の
中心軸の延長線に対して対称位置に２個設けたものであ
り、これによっても同様な効果を奏する。FIG. 3 shows two guide holes 32 formed in the protector 31 at symmetrical positions with respect to the extension line of the central axis of the injection hole, and the same effect can be obtained.
〈考案の効果〉 本考案は、以上説明したように、噴孔内にピントル部
を設けると共に、噴孔の外方をプロテクタにより覆うよ
うにしたので、燃料流量調整機能を確保しつつデポジッ
トの付着を防止できると共に、燃料の噴霧パターンも従
来例と同様に最適に確保できる。<Effects of the Invention> As described above, according to the present invention, the pintle portion is provided in the injection hole and the outside of the injection hole is covered with the protector, so that the deposit adhesion is ensured while ensuring the fuel flow rate adjusting function. In addition to preventing the above, the fuel spray pattern can be optimally secured as in the conventional example.
第１図は本考案の一実施例を示す構成図、第２図は同上
の要部平面図、第３図は同上の変形例を示す要部平面
図、第４図は電磁式燃料噴射弁の従来例を示す構成図、
第５図は同上の要部拡大図である。 ２…ノズルボディ、2A…シート部、５…噴孔、21…ニー
ドルバルブ、21A…シート部、22…ピントル部、23…間
隙、24…プロテクタ、25…空間部、26…ガイド孔FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a plan view of relevant parts of the same, FIG. 3 is a plan view of relevant parts of a modified example of the same, and FIG. 4 is an electromagnetic fuel injection valve. A block diagram showing a conventional example of
FIG. 5 is an enlarged view of the main part of the above. 2 ... Nozzle body, 2A ... Seat part, 5 ... Injection hole, 21 ... Needle valve, 21A ... Seat part, 22 ... Pintle part, 23 ... Gap, 24 ... Protector, 25 ... Space part, 26 ... Guide hole
Claims (1)
を電磁コイルの電磁吸引力によりリフトさせることによ
り、前記ニードルバルブのシート部を前記ノズルボディ
のシート部から離間させ、前記シート部に連なってノズ
ルボディ先端部に形成された筒状の噴孔から燃料を噴射
するようにした内燃機関の電磁式燃料噴射弁において、 前記噴孔内壁と所定間隙を設けて前記噴孔内に先端面が
ノズルボディ先端面より噴孔内に位置するように配設さ
れる筒状のピントル部を、前記ニードルバルブの先端部
に、形成し、 かつ前記噴孔の外方を所定の空間部を介して覆うプロテ
クタを前記ノズルボディに取付けると共に、前記プロテ
クタに前記空間部と外方とを連通するガイド孔を形成す
るようにしたことを特徴とする内燃機関の電磁式燃料噴
射弁。1. A needle valve fitted in a nozzle body is lifted by an electromagnetic attraction force of an electromagnetic coil to separate a seat portion of the needle valve from a seat portion of the nozzle body and to be continuous with the seat portion. In an electromagnetic fuel injection valve for an internal combustion engine, which is configured to inject fuel from a cylindrical injection hole formed at a tip end portion of a nozzle body, a tip surface is formed in the injection hole by providing a predetermined gap with an inner wall of the injection hole. A cylindrical pintle portion arranged so as to be located inside the injection hole from the tip end surface of the body is formed at the tip end portion of the needle valve, and the outside of the injection hole is covered through a predetermined space portion. An electromagnetic fuel injection system for an internal combustion engine, characterized in that a protector is attached to the nozzle body, and a guide hole is formed in the protector to connect the space and the outside. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990034197U JPH085333Y2 (en) | 1990-04-02 | 1990-04-02 | Electromagnetic fuel injection valve for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990034197U JPH085333Y2 (en) | 1990-04-02 | 1990-04-02 | Electromagnetic fuel injection valve for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03127079U JPH03127079U (en) | 1991-12-20 |
| JPH085333Y2 true JPH085333Y2 (en) | 1996-02-14 |
Family
ID=31538460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990034197U Expired - Lifetime JPH085333Y2 (en) | 1990-04-02 | 1990-04-02 | Electromagnetic fuel injection valve for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH085333Y2 (en) |
-
1990
- 1990-04-02 JP JP1990034197U patent/JPH085333Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03127079U (en) | 1991-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Effective date: 20040406 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040604 |
|
| A02 | Decision of refusal |
Effective date: 20040706 Free format text: JAPANESE INTERMEDIATE CODE: A02 |