JPH06294367A - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- JPH06294367A JPH06294367A JP10775393A JP10775393A JPH06294367A JP H06294367 A JPH06294367 A JP H06294367A JP 10775393 A JP10775393 A JP 10775393A JP 10775393 A JP10775393 A JP 10775393A JP H06294367 A JPH06294367 A JP H06294367A
- Authority
- JP
- Japan
- Prior art keywords
- passage
- fuel
- injection
- diameter
- intermediate passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関用燃料噴射弁
に関し、特に二方向噴射式燃料噴射弁の改良に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve for an internal combustion engine, and more particularly to improvement of a two-way injection type fuel injection valve.
【０００２】[0002]
【従来の技術】図４に示すような１つのシリンダ４１に
２つの吸入ポート４２が設けられた多弁式エンジンに於
ては、１つの吸気通路４３が吸入ポート４２の上流側で
２つに分岐しており、一般的に、この分岐部の直上流位
置に燃料噴射弁４４が設けられている。2. Description of the Related Art In a multi-valve engine in which one cylinder 41 is provided with two intake ports 42 as shown in FIG. 4, one intake passage 43 is branched into two upstream of the intake port 42. In general, the fuel injection valve 44 is provided immediately upstream of this branch portion.
【０００３】このような、１つの燃料噴射弁で２つの吸
入ポートへ燃料を供給する場合、噴射弁のノズルから噴
射される燃料の分配性が問題となる。この分配性の向上
を図るべく、燃料噴射量を計量する１つの噴射孔の下流
側に、噴射孔から噴射された燃料を２方向に分岐させる
ための２つの噴射燃料通路を並設した構成の燃料噴射弁
が種々提案されている。When supplying fuel to two intake ports with one fuel injection valve, the distributability of the fuel injected from the nozzle of the injection valve becomes a problem. In order to improve the distributability, two injection fuel passages for branching the fuel injected from the injection holes in two directions are arranged side by side on the downstream side of one injection hole for measuring the fuel injection amount. Various fuel injection valves have been proposed.
【０００４】例えば、実開昭６１−１９８５７４号公報
には、２つの噴射燃料通路の分岐部に燃料拡散部を設
け、この部分に燃料を衝突させて吐出燃料の微粒化を図
ったものが提案されている。For example, Japanese Utility Model Laid-Open No. 61-198574 proposes that a fuel diffusion portion is provided at a branch portion of two injection fuel passages, and fuel is made to collide with this portion to atomize the discharged fuel. Has been done.
【０００５】また実開昭６１−９７５８３号公報には、
２つの噴射燃料通路の合流部を、２つの通路の開口面を
包括した形状とした構造が提案されている。Further, Japanese Utility Model Publication No. 61-97583 discloses that
A structure has been proposed in which the joining portion of the two injected fuel passages has a shape including the opening surfaces of the two passages.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら前者の構
造によると、２つの噴射燃料通路の分岐部付近に衝突し
た際に燃料が飛散し、これが噴射燃料通路の壁面に再付
着するため、噴射燃料通路から吐出された燃料の粒径が
不均一になることが考えられる。また、飛散方向も不安
定となるため、吐出フォームがばらつくといった不都合
もある。However, according to the former structure, the fuel is scattered when it collides with the vicinity of the branch portion of the two injected fuel passages, and the fuel is reattached to the wall surface of the injected fuel passage. It is conceivable that the particle size of the fuel discharged from the fuel cell becomes uneven. In addition, since the scattering direction is also unstable, there is a problem that the ejection foam varies.
【０００７】そして後者の構造のように、合流部の断面
内に２つの噴射燃料通路が開口していると、合流部にテ
ーパを付して燃料溜まりの防止を図ったとしても、合流
部の平坦面あるいはテーパ面に燃料が付着することは避
けられず、これも粒径の不均一化や噴射量の不安定化を
招く要因となる。When the two injection fuel passages are opened in the cross section of the merging portion as in the latter structure, even if the merging portion is tapered to prevent fuel accumulation, It is unavoidable that fuel adheres to a flat surface or a tapered surface, which also causes non-uniformity of particle diameter and instability of injection amount.
【０００８】本発明は、このような従来技術の不都合を
解消するべく案出されたものであり、その主な目的は、
粒径不均一化、噴射量不安定化を抑制し、微粒化をより
一層促進し得る燃料噴射弁を提供することにある。The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
(EN) It is intended to provide a fuel injection valve capable of suppressing nonuniformity of particle diameter and instability of injection amount and further promoting atomization.
【０００９】[0009]
【課題を解決するための手段】このような目的は、本発
明によれば、燃料噴射量を計量する１つの噴射孔と、該
噴射孔から噴射された燃料を２方向に分岐させるべく該
噴射孔の下流側に並設された２つの噴射燃料通路と、前
記噴射孔と前記噴射燃料通路の分岐部との間に位置する
中間通路とを有する燃料噴射弁であって、前記中間通路
は、噴射軸線に直交する断面の形状が、前記２つの噴射
燃料通路の並び方向に長径をおいた長円形をなし、前記
噴射燃料通路は、上流端の直径が前記中間通路の短径よ
り大きくかつ下流側が縮径されたテーパ状部分および該
テーパ状部分の下流端に連続する直管状部分からなり、
前記噴射燃料通路と前記中間通路との接続部に於ける前
記中間通路の長径上にアシストエア通路が開口している
ことを特徴とする燃料噴射弁を提供することによって達
成される。According to the present invention, such an object is to provide one injection hole for measuring the fuel injection amount and the injection for branching the fuel injected from the injection hole in two directions. A fuel injection valve having two injection fuel passages arranged side by side on the downstream side of a hole, and an intermediate passage located between the injection hole and a branch portion of the injection fuel passage, wherein the intermediate passage comprises: The shape of the cross section orthogonal to the injection axis is an ellipse having a major axis in the direction in which the two injected fuel passages are arranged, and the injected fuel passage has an upstream end diameter larger than the minor diameter of the intermediate passage and downstream. A tapered portion whose side is reduced in diameter and a straight tubular portion continuous to the downstream end of the tapered portion,
The present invention is achieved by providing a fuel injection valve characterized in that an assist air passage is opened on a major axis of the intermediate passage at a connecting portion between the injection fuel passage and the intermediate passage.
【００１０】[0010]
【作用】このような構成によれば、燃料及びアシストエ
アの流れ方向が阻害されないため、燃料が円滑に流れる
上、噴射燃料通路中のテーパ状部分と直管状部分との境
界の角度変化部で通路壁面から燃料が剥離する。そして
剥離した燃料にアシストエアが当たることにより、微粒
化が促進される。According to this structure, since the flow directions of the fuel and the assist air are not obstructed, the fuel flows smoothly, and the angle changing portion at the boundary between the tapered portion and the straight tubular portion in the injection fuel passage is formed. Fuel peels from the wall of the passage. The assisted air hits the separated fuel to promote atomization.
【００１１】[0011]
【実施例】以下に添付の図面に示された具体的な実施例
に基づいて本発明の構成を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.
【００１２】図１は、本発明に基づき構成された燃料噴
射弁１の先端部を示しており、この燃料噴射弁１は、燃
料噴射量を計量する１つの噴射孔２を有する本体ノズル
部３に、アウタキャップ４とインナキャップ５とからな
る噴射燃料通路体が嵌着されている。FIG. 1 shows a tip portion of a fuel injection valve 1 constructed according to the present invention. The fuel injection valve 1 has a main body nozzle portion 3 having one injection hole 2 for measuring a fuel injection amount. An injection fuel passage body composed of an outer cap 4 and an inner cap 5 is fitted in the.
【００１３】アウタキャップ４の端部には、噴射燃料流
を２方向に分岐させるために、２つの噴射燃料通路６が
並設されている。そしてインナキャップ５には、本体ノ
ズル部３と２つの噴射燃料通路６の上流端とを連結する
中間通路７が形成されている。この中間通路７は、噴射
軸線に直交する面の断面形状が、２つの噴射燃料通路６
の並び方向に長径をおいた長円形をなしている。At the end of the outer cap 4, two injected fuel passages 6 are provided in parallel so as to branch the injected fuel flow in two directions. The inner cap 5 is formed with an intermediate passage 7 that connects the main body nozzle portion 3 and the upstream ends of the two injected fuel passages 6. The cross-sectional shape of the surface of the intermediate passage 7 orthogonal to the injection axis is two injection fuel passages 6.
It has an oval shape with a major axis in the direction of arrangement.
【００１４】２方向に分岐した噴射燃料通路６は、その
上流端の直径が中間通路７の短径より大きくかつ下流側
が縮径されたテーパ状部分６ａと、該テーパ状部分６ａ
の下流端に連続する直管状部分６ｂとからなっている。
このテーパ状部分６ａと直管状部分６ａとは、互いに連
続的に接続されており、従ってその境界部分にて壁面角
度が変化している。The injected fuel passage 6 branched in two directions has a tapered portion 6a having a diameter at the upstream end larger than the minor diameter of the intermediate passage 7 and a reduced diameter on the downstream side, and the tapered portion 6a.
And a straight tubular portion 6b continuous to the downstream end of the.
The tapered portion 6a and the straight tubular portion 6a are continuously connected to each other, so that the wall surface angle changes at the boundary portion.
【００１５】２つの噴射燃料通路６間には、下流側が外
開きとなる挟角αが与えられている。またテーパ状部分
６ａのテーパ角度βは、テーパ面から剥離した燃料が再
び直管状部分６ｂに衝突しない角度に設定されている。
ここで特に通路軸線の挟角αとテーパー角βとの関係
を、αが小さくなるほどβが大きくなるように設定する
と良く、これによりテーパ状部分６ａと直管状部分６ｂ
との接続面の角度変化が大きくとれるので、通路壁面か
らの燃料の剥離効果を大きくすることができる。Between the two injected fuel passages 6 is provided an included angle α that opens outward on the downstream side. Further, the taper angle β of the tapered portion 6a is set to an angle at which the fuel separated from the tapered surface does not collide with the straight tubular portion 6b again.
Here, in particular, the relationship between the included angle α of the passage axis and the taper angle β may be set such that β decreases as α decreases, whereby the tapered portion 6a and the straight tubular portion 6b are formed.
Since the change in the angle of the connection surface with can be made large, the effect of separating the fuel from the wall surface of the passage can be increased.
【００１６】インナキャップ５の外面には、アシストエ
ア通路８が形成されている。このアシストエア通路８の
開口は、中間通路７と噴射燃料通路６との接続面に於け
る中間通路６の長径線上に開口している。そしてアシス
トエア通路８の角度及び開口位置は、テーパ状部分６ａ
から剥離した燃料にエアが当たるように設定されてい
る。An assist air passage 8 is formed on the outer surface of the inner cap 5. The opening of the assist air passage 8 opens on the major axis line of the intermediate passage 6 at the connection surface between the intermediate passage 7 and the injected fuel passage 6. The angle and the opening position of the assist air passage 8 are determined by the tapered portion 6a.
It is set so that the air separated from the fuel will hit the air.
【００１７】[0017]
【発明の効果】このように本発明に於ては、中間通路の
短径を噴射燃料通路の上流側開口面の直径より小さく
し、かつ長径上に２つの噴射燃料通路を並べるものとし
たので、中間通路の開口輪郭が噴射燃料通路の開口輪郭
の内側となり、燃料溜まりが生じることを好適に防止で
きる。またテーパと直管との角度変化による通路壁面か
らの燃料剥離を利用するため、噴射軸線の挟角を容易に
変えることができ、吐出角度や吐出フォームの安定化を
達成できる。しかも、中間通路と噴射燃料通路との接続
部からアシストエアを吹き込むことにより、テーパ状部
分からの燃料の剥離効果が向上するので、微粒化の促進
を達成できる。As described above, in the present invention, the minor diameter of the intermediate passage is made smaller than the diameter of the upstream opening surface of the injected fuel passage, and the two injected fuel passages are arranged on the major diameter. The opening contour of the intermediate passage is inside the opening contour of the injected fuel passage, so that it is possible to preferably prevent fuel accumulation. Further, since the fuel separation from the wall surface of the passage due to the angle change between the taper and the straight pipe is used, the included angle of the injection axis can be easily changed, and the discharge angle and the discharge foam can be stabilized. Moreover, by blowing the assist air from the connecting portion between the intermediate passage and the injected fuel passage, the effect of separating the fuel from the tapered portion is improved, so that atomization can be promoted.
【図１】本発明による燃料噴射弁の要部断面図。FIG. 1 is a sectional view of essential parts of a fuel injection valve according to the present invention.
【図２】図１のII−II線に沿う断面図。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】図１のIII−III線に沿う断面図。FIG. 3 is a sectional view taken along the line III-III in FIG.
【図４】多弁式エンジンと燃料噴射弁との関係を示す模
式図。FIG. 4 is a schematic diagram showing a relationship between a multi-valve engine and a fuel injection valve.
１ 燃料噴射弁 ２ 噴射孔 ３ 本体ノズル部 ４ アウタキャップ ５ インナキャップ ６ 噴射燃料通路 ６ａ テーパ状部分 ６ｂ 直管状部分 ７ 中間通路 ８ アシストエア通路 DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Injection hole 3 Main body nozzle part 4 Outer cap 5 Inner cap 6 Injection fuel passage 6a Tapered portion 6b Straight tubular portion 7 Intermediate passage 8 Assist air passage
フロントページの続き (72)発明者 佐保田 克三 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内Front Page Continuation (72) Inventor Katsumi Sabota 4-1-1 Chuo, Wako City, Saitama Prefecture Honda R & D Co., Ltd.
Claims (1)
該噴射孔から噴射された燃料を２方向に分岐させるべく
該噴射孔の下流側に並設された２つの噴射燃料通路と、
前記噴射孔と前記噴射燃料通路の分岐部との間に位置す
る中間通路とを有する燃料噴射弁であって、 前記中間通路は、噴射軸線に直交する断面の形状が、前
記２つの噴射燃料通路の並び方向に長径をおいた長円形
をなし、 前記噴射燃料通路は、上流端の直径が前記中間通路の短
径より大きくかつ下流側が縮径されたテーパ状部分およ
び該テーパ状部分の下流端に連続する直管状部分からな
り、 前記噴射燃料通路と前記中間通路との接続部に於ける前
記中間通路の長径上にアシストエア通路が開口している
ことを特徴とする燃料噴射弁。1. An injection hole for measuring a fuel injection amount,
Two injection fuel passages arranged in parallel on the downstream side of the injection hole so as to branch the fuel injected from the injection hole in two directions;
A fuel injection valve having an intermediate passage located between the injection hole and a branch portion of the injected fuel passage, wherein the intermediate passage has a cross-sectional shape orthogonal to an injection axis, The injection fuel passage has a tapered portion with a diameter at the upstream end larger than the minor diameter of the intermediate passage and a diameter reduced at the downstream side, and the downstream end of the tapered portion. A fuel injection valve comprising a straight tubular portion continuous with the above, and an assist air passage opening on a major axis of the intermediate passage at a connecting portion between the injection fuel passage and the intermediate passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10775393A JPH06294367A (en) | 1993-04-08 | 1993-04-08 | Fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10775393A JPH06294367A (en) | 1993-04-08 | 1993-04-08 | Fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06294367A true JPH06294367A (en) | 1994-10-21 |
Family
ID=14467108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10775393A Pending JPH06294367A (en) | 1993-04-08 | 1993-04-08 | Fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06294367A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008208372A (en) * | 1995-09-26 | 2008-09-11 | Gtat Llc | High molecular weight fuel additive |
-
1993
- 1993-04-08 JP JP10775393A patent/JPH06294367A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008208372A (en) * | 1995-09-26 | 2008-09-11 | Gtat Llc | High molecular weight fuel additive |
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