JPH0835463A - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- JPH0835463A JPH0835463A JP17149894A JP17149894A JPH0835463A JP H0835463 A JPH0835463 A JP H0835463A JP 17149894 A JP17149894 A JP 17149894A JP 17149894 A JP17149894 A JP 17149894A JP H0835463 A JPH0835463 A JP H0835463A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- fuel
- injection hole
- cross
- holes
- 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.)
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- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関の気筒に向け
て燃料を噴射する燃料噴射弁の改良に関し、特に、３個
以上の噴射孔を備えた燃料噴射弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved fuel injection valve for injecting fuel into a cylinder of an internal combustion engine, and more particularly to a fuel injection valve having three or more injection holes.
【０００２】[0002]
【従来の技術】従来技術の燃料噴射弁としては、例えば
実開平４−１０５９６７号公報等に記載されている如
く、種々の形式のものが知られている。2. Description of the Related Art As conventional fuel injection valves, various types are known, as described in, for example, Japanese Utility Model Laid-Open No. 105967/1992.
【０００３】ところで、燃料噴射弁から噴射された燃料
は、燃焼状態の安定化やエミッションの低減等の見地か
ら、微粒化されている方が好ましい。従って、前記公報
に記載のものでは、ノズル部材の噴射孔に微粒化促進用
の空気（アシストエア）を供給し、このアシストエアに
よって微粒化燃料を得ている。By the way, it is preferable that the fuel injected from the fuel injection valve be atomized from the viewpoint of stabilizing the combustion state and reducing the emission. Therefore, in the device described in the above publication, atomization promoting air (assist air) is supplied to the injection holes of the nozzle member, and atomized fuel is obtained by this assist air.
【０００４】一方、図３４に示す如く、このようなアシ
ストエアに頼らず、燃料同士を互いに衝突させて微粒化
を行う燃料噴射弁も知られている。即ち、燃料噴射弁の
一部を構成する筒状のケーシング本体２００の先端に
は、ケーシング本体２００と共にケーシングを構成する
ノズル部材２０１が液密に装着されており、このノズル
部材２０１には、一方の噴射孔２０２と他方の噴射孔２
０３との２個の噴射孔がそれぞれ同径をもって形成され
ている。また、これら各噴射孔２０２，２０３は、その
各噴射軸線Ｘ1，Ｘ2が燃料噴射弁の軸線Ｃから所定角度
θだけ傾斜するように穿設されている。そして、各噴射
孔２０２，２０３から噴射された燃料は、燃料噴射弁の
軸線Ｃ上の点Ｐで交差して互いに衝突し、これにより燃
料自身で微粒化が行われるようになっている。On the other hand, as shown in FIG. 34, there is also known a fuel injection valve for atomizing fuel by colliding fuels with each other without relying on such assist air. That is, a nozzle member 201 that forms a casing together with the casing body 200 is mounted in a liquid-tight manner at the tip of a cylindrical casing body 200 that forms a part of the fuel injection valve. Injection hole 202 and the other injection hole 2
No. 03 and No. 03 are formed with the same diameter. The injection holes 202 and 203 are formed so that the injection axis lines X 1 and X 2 are inclined from the axis line C of the fuel injection valve by a predetermined angle θ. Then, the fuel injected from each of the injection holes 202 and 203 intersects at a point P on the axis C of the fuel injection valve and collides with each other, whereby the fuel itself is atomized.
【０００５】しかし、この従来技術では、燃料同士を衝
突させて微粒化を図っているが、単に各噴射孔２０２，
２０３の口径寸法Ｄを等しく形成しているに過ぎないた
め、微粒化性能が十分に発揮されていなかった。However, in this prior art, although the fuels are collided with each other to atomize, the injection holes 202,
Since the diameter dimension D of 203 was simply formed, the atomization performance was not sufficiently exhibited.
【０００６】このような従来技術の問題に鑑み、本出願
人は、先に特願平６−４６７０３号（平成６年３月１７
日出願 発明の名称「液体噴射弁」）として、図３５〜
図３７に示す燃料噴射弁（以下、これを「先行技術」と
いう）を提案した。In view of the problems of the prior art as described above, the present applicant has previously filed Japanese Patent Application No. 6-46703 (March 17, 1994).
As of the name of the invention “Liquid injection valve”)
A fuel injection valve shown in FIG. 37 (hereinafter referred to as "prior art") has been proposed.
【０００７】即ち、吸気通路の途中に吸気ポート（いず
れも図示せず）を臨んで取り付けられた燃料噴射弁３０
０は、段付筒状のケーシング本体３０１と、このケーシ
ング本体３０１内にヨーク３０２を介して収容された電
磁アクチュエータ３０３と、この電磁アクチュエータ３
０３の内周側中空部に配設された磁性材料からなるコア
３０４と、後述の弁体３０５等とを備えて構成されてい
る。That is, the fuel injection valve 30 is mounted in the middle of the intake passage so as to face the intake port (neither is shown).
Reference numeral 0 denotes a stepped tubular casing body 301, an electromagnetic actuator 303 housed in the casing body 301 via a yoke 302, and the electromagnetic actuator 3
03, a core 304 made of a magnetic material, which is disposed in the hollow portion on the inner peripheral side, and a valve body 305, which will be described later, and the like.
【０００８】ケーシング本体３０１内に設けられた弁体
３０５は、磁性材料から略半球状に形成され、その基端
側（図中の上側）には薄肉な支持部３０５Ａが一体的に
形成されている。また、この弁体３０５は、コイルスプ
リング３０６及び板ばね３０７によって常時閉弁方向
（図中の下側）に付勢されていると共に、各支持部３０
５Ａがヨーク３０２とケーシング本体３０１との間で挾
持固定されている。ケーシング本体３０１の先端内周側
には、弁体３０５が離着座するための弁座部３０８が形
成されている。そして、この弁座部３０８に弁体３０５
が着座することにより、噴孔３０９が閉塞されて、燃料
供給配管（図示せず）からの燃料が溜まる燃料溜まり３
１０と後述のノズル部材３１１とが互いに隔離されるよ
うになっている。The valve body 305 provided in the casing body 301 is formed of a magnetic material in a substantially hemispherical shape, and a thin support portion 305A is integrally formed on the base end side (upper side in the figure) of the valve body 305. There is. The valve body 305 is normally urged in the valve closing direction (lower side in the figure) by the coil spring 306 and the leaf spring 307, and each support portion 30 is provided.
5A is sandwiched and fixed between the yoke 302 and the casing body 301. A valve seat portion 308 is formed on the inner peripheral side of the tip of the casing body 301 so that the valve body 305 can be seated on and off. Then, the valve body 305 is attached to the valve seat portion 308.
Is seated, the injection hole 309 is closed, and fuel from the fuel supply pipe (not shown) is stored in the fuel reservoir 3
10 and a nozzle member 311 described later are isolated from each other.
【０００９】ケーシング本体３０１の先端側にはケーシ
ングの一部を構成するノズル部材３１１が液密に装着さ
れ、このノズル部材３１１には、互いに口径の異なる一
方の噴射孔３１２と他方の噴射孔３１３とがそれぞれ斜
めに穿設されている。即ち、図３６，図３７にも示す如
く、一方の噴射孔３１２は、その出口部３１２Ａが口径
寸法Ｄ1を有する大円状に形成され、その軸線Ｘ1が燃料
噴射弁の軸線Ｃに対して所定角度θ1だけ傾斜してい
る。また、他方の噴射孔３１３は、その出口部３１３Ａ
が口径寸法Ｄ2を有する小円状に形成され、その軸線Ｘ2
が前記軸線Ｃに対して所定角度θ2だけ傾斜している。
ここで、前記燃料噴射弁の軸線Ｃは、弁体３０５の開閉
方向と略一致する。A nozzle member 311 forming a part of the casing is mounted in a liquid-tight manner on the front end side of the casing body 301, and the nozzle member 311 has one injection hole 312 and the other injection hole 313 having different diameters. And are obliquely provided. That is, as shown in FIG. 36 and FIG. 37, one of the injection holes 312 has an outlet portion 312A formed in a great circle shape having a diameter dimension D 1 , and its axis X 1 is relative to the axis C of the fuel injection valve. And is inclined by a predetermined angle θ 1 . The other injection hole 313 has an outlet 313A.
Is formed into a small circle having a diameter dimension D 2 and its axis X 2
Is inclined with respect to the axis C by a predetermined angle θ 2 .
Here, the axis C of the fuel injection valve substantially coincides with the opening / closing direction of the valve element 305.
【００１０】これにより、各噴射孔３１２，３１３の噴
射軸線Ｘ1，Ｘ2は軸線Ｃ上の点Ｐで交差し、この交差点
Ｐで各噴射孔３１２，３１３からそれぞれ噴射された燃
料が衝突するようになっている。なお、３１４は燃料噴
射弁３００を取り付けるための取付ステーである。As a result, the injection axis lines X 1 and X 2 of the injection holes 312 and 313 intersect at a point P on the axis line C, and the fuel injected from the injection holes 312 and 313 collides at the intersection point P. It is like this. Reference numeral 314 is a mounting stay for mounting the fuel injection valve 300.
【００１１】[0011]
【発明が解決しようとする課題】ところで、本出願人が
先に提案した先行技術によれば、断面積の平方根比たる
口径寸法を違えた一対の噴射孔３１２，３１３をノズル
部材３１１に設け、これら各噴射孔３１２，３１３の噴
射軸線Ｘ1，Ｘ2を噴射弁の軸線Ｃ上で交差させる構成を
採用したため、燃料同士の衝突時に生じる共振現象を利
用して燃料の微粒化を促進することができる。By the way, according to the prior art previously proposed by the present applicant, a pair of injection holes 312 and 313 having different diameter dimensions as a square root ratio of the cross-sectional area are provided in the nozzle member 311. Since the injection axes X 1 and X 2 of the injection holes 312 and 313 are intersected with each other on the axis C of the injection valve, it is possible to promote atomization of the fuel by utilizing the resonance phenomenon generated when the fuels collide with each other. You can
【００１２】しかしながら、その後の研究の結果、噴射
孔の数と微粒化との関係がより明らかになり、まだ先行
技術には改善の余地があることが分かった。However, as a result of subsequent research, the relationship between the number of injection holes and atomization became more clear, and it was found that the prior art still has room for improvement.
【００１３】そこで、本発明は、かかる先行技術の改良
を図るべくなされたもので、その主たる目的は、燃料の
衝突による微粒化を一層促進することにある。また、本
発明の他の目的は、微粒化性能を高めつつ噴射の指向性
も確保することにある。本発明のさらなる目的は、高度
に微粒化された燃料粒子により偏平な噴霧パターンを形
成することにある。Therefore, the present invention has been made in order to improve the prior art, and its main purpose is to further promote atomization due to collision of fuel. Another object of the present invention is to secure the directivity of injection while improving the atomization performance. It is a further object of the present invention to form a flat spray pattern with highly atomized fuel particles.
【００１４】[0014]
【課題を解決するための手段】そこで、本発明に係る燃
料噴射弁の構成は、内部に燃料流路が設けられたケーシ
ングと、このケーシングの一端側に前記燃料流路にそれ
ぞれ連通して設けられた３個の噴射孔と、ケーシング内
に軸方向に移動可能に設けられ、これら３個の噴射孔を
開閉する弁体とを備えた燃料噴射弁であって、前記３個
の噴射孔からそれぞれ噴射された燃料が互いに衝突する
ように該各噴射孔の噴射軸線を設定するとともに、少な
くとも一の噴射孔の断面積と他の噴射孔の断面積との平
方根の比が１．２以上となるように設定したことを特徴
としている。Therefore, the structure of a fuel injection valve according to the present invention is provided with a casing in which a fuel passage is provided, and one end of the casing which is connected to the fuel passage. A fuel injection valve having three injection holes provided therein and a valve body that is provided in the casing so as to be movable in the axial direction and that opens and closes these three injection holes. The injection axis of each injection hole is set so that the injected fuels collide with each other, and the ratio of the square root of the cross-sectional area of at least one injection hole to the cross-sectional area of another injection hole is 1.2 or more. It is characterized by setting so that
【００１５】また、請求項２に係るものでは、内部に燃
料流路が設けられたケーシングと、このケーシングの一
端側に前記燃料流路にそれぞれ連通して設けられた４個
以上の噴射孔と、ケーシング内に軸方向に移動可能に設
けられ、これら４個以上の噴射孔を開閉する弁体とを備
えた燃料噴射弁であって、前記４個以上の噴射孔からそ
れぞれ噴射された燃料が互いに衝突するように該各噴射
孔の噴射軸線を設定するとともに、少なくとも一の噴射
孔の断面積を他の噴射孔の断面積と違えたことを特徴と
している。Further, according to a second aspect of the present invention, a casing having a fuel flow passage provided therein, and four or more injection holes provided at one end of the casing so as to communicate with the fuel flow passage, respectively. A fuel injection valve that is provided movably in the axial direction in the casing and that has a valve body that opens and closes these four or more injection holes, wherein the fuel injected from each of the four or more injection holes is The injection axes of the respective injection holes are set so as to collide with each other, and the cross-sectional area of at least one injection hole is different from the cross-sectional area of the other injection holes.
【００１６】さらに、前記各噴射孔の断面を非円形状に
形成するのが好ましい。Furthermore, it is preferable that the cross section of each of the injection holes is formed in a non-circular shape.
【００１７】また、前記各噴射孔の噴射軸線を同一平面
上に位置させてもよい。Further, the injection axis of each injection hole may be located on the same plane.
【００１８】一方、前記各噴射孔から噴射された燃料の
衝突部近傍に向けてアシストエアを供給する構成として
もよい。On the other hand, a structure may be adopted in which assist air is supplied toward the vicinity of the collision portion of the fuel injected from each of the injection holes.
【００１９】[0019]
【作用】３個の噴射孔のうち少なくとも一の噴射孔の断
面積と他の噴射孔の断面積との平方根の比を１．２以上
に設定すれば、各噴射孔からそれぞれ噴射された燃料が
衝突するときに強い共振現象が発生するため、微粒化が
促進する。If the ratio of the square root of the cross-sectional area of at least one of the three injection holes and the cross-sectional area of the other injection holes is set to 1.2 or more, the fuel injected from each injection hole A strong resonance phenomenon occurs when colliding with each other, which promotes atomization.
【００２０】また、４個以上の噴射孔のうち少なくとも
一の噴射孔の断面積と他の噴射孔の断面積とを違えれ
ば、各噴射孔から噴射された燃料が衝突するときに強い
共振現象が発生するため、微粒化が促進する。Further, if the cross-sectional area of at least one of the four or more injection holes is different from the cross-sectional area of the other injection hole, strong resonance occurs when the fuel injected from each injection hole collides. Since a phenomenon occurs, atomization is promoted.
【００２１】また、前記各噴射孔の断面を非円形状に形
成すれば、微粒化しつつ噴霧に指向性を持たせることが
できる。If the cross section of each of the injection holes is formed in a non-circular shape, the atomization can be performed while atomizing.
【００２２】さらに、前記各噴射孔の噴射軸線を同一平
面上に位置させれば、偏平な噴霧パターンを得ることが
できる。Further, if the injection axis of each injection hole is located on the same plane, a flat spray pattern can be obtained.
【００２３】一方、前記各噴射孔から噴射された液体の
衝突部近傍に向けてアシストエアを供給すれば、一層微
粒化を促進することができる。On the other hand, if assist air is supplied toward the vicinity of the collision portion of the liquid ejected from each of the ejection holes, atomization can be further promoted.
【００２４】[0024]
【実施例】以下、本発明の実施例を図１〜図３３に基づ
いて詳述する。Embodiments of the present invention will be described in detail below with reference to FIGS.
【００２５】まず、図１〜図５は本発明の第１の実施例
に係り、図１は燃料噴射弁の要部を拡大して示す断面図
であって、先行技術と同様に、燃料噴射弁１は、吸気通
路の途中に吸気ポート（いずれも図示せず）を臨んで取
り付けられている。この燃料噴射弁１の一部を構成する
段付筒状のケーシング本体２内には、コイル等からなる
電磁アクチュエータ３がヨーク４を介して取り付けら
れ、この電磁アクチュエータ３の内周側中空部には、磁
性材料から略円柱状に形成されたコア５が設けられてい
る。First, FIGS. 1 to 5 relate to a first embodiment of the present invention, and FIG. 1 is an enlarged sectional view showing an essential part of a fuel injection valve. The valve 1 is attached so as to face an intake port (neither is shown) in the middle of the intake passage. An electromagnetic actuator 3 made of a coil or the like is mounted via a yoke 4 in a stepped tubular casing body 2 that constitutes a part of the fuel injection valve 1, and the electromagnetic actuator 3 has a hollow portion on the inner peripheral side. Is provided with a core 5 formed of a magnetic material in a substantially cylindrical shape.
【００２６】ケーシング本体２内に設けられた弁体６
は、磁性材料から略半球状に形成され、その基端側には
弾性を有する薄肉な支持部６Ａが一体的に形成されてい
る。また、この弁体６は、コイルスプリング７及び板ば
ね８によって常時閉弁方向に付勢されていると共に、支
持部６Ａの端部がヨーク４とケーシング本体２との間で
挾持固定されている。そして、図示せぬコントロールユ
ニットからの制御信号によって電磁アクチュエータ３が
励磁されることにより、弁体６はコア５に吸引され、ば
ね力に抗して開弁するようになっている。A valve body 6 provided in the casing body 2
Is formed from a magnetic material in a substantially hemispherical shape, and a thin support portion 6A having elasticity is integrally formed on the base end side thereof. The valve body 6 is constantly urged in the valve closing direction by the coil spring 7 and the leaf spring 8, and the end portion of the support portion 6A is sandwiched and fixed between the yoke 4 and the casing body 2. . When the electromagnetic actuator 3 is excited by a control signal from a control unit (not shown), the valve body 6 is attracted by the core 5 and opens against the spring force.
【００２７】ケーシング本体２の先端側内周側には弁体
６が離着座するための弁座部９が形成されている。そし
て、この弁座部９に弁体６が着座することにより、噴孔
９Ａが閉塞され、燃料供給配管（図示せず）からの燃料
が溜まる燃料流路としての燃料溜まり１０と後述のノズ
ル部材１１とが互いに隔離される。A valve seat portion 9 is formed on the inner peripheral side of the front end side of the casing body 2 for the valve body 6 to be seated on and off. When the valve element 6 is seated on the valve seat portion 9, the injection hole 9A is closed, and the fuel reservoir 10 as a fuel flow passage for accumulating fuel from a fuel supply pipe (not shown) and a nozzle member described later. 11 and 11 are isolated from each other.
【００２８】ケーシング本体２と共にケーシングを構成
するノズル部材１１は、ケーシング本体２の一端側を施
蓋して液密に装着されており、互いに口径の異なる第１
の噴射孔１２，第２の噴射孔１３，第３の噴射孔１４の
合計３個の噴射孔がそれぞれ斜めに穿設されている。The nozzle member 11 forming a casing together with the casing body 2 is mounted in a liquid-tight manner by covering one end side of the casing body 2 and is installed in a liquid-tight manner.
In total, three injection holes 12, a second injection hole 13, and a third injection hole 14 are obliquely provided.
【００２９】即ち、図２の平面図と図３，図４の拡大断
面図に示す如く、第１の噴射孔１２は、その出口部１２
Ａが口径寸法Ｄ1を有する大円状に形成され、軸線Ｘ1が
燃料噴射弁の軸線Ｃに対し所定角度θ1だけ傾斜してい
る。また、第２の噴射孔１３は、その出口部１３Ａが第
１の噴射孔１２の口径寸法Ｄ1よりも小さい口径寸法Ｄ2
を有する中円状に形成され、軸線Ｘ2が前記軸線Ｃに対
して所定角度θ2だけ傾斜している。さらに、第３の噴
射孔１４は、その出口部１４Ａが第２の噴射孔１３の口
径寸法Ｄ2よりも小さい口径寸法Ｄ3（Ｄ1＞Ｄ2＞Ｄ3）
を有する小円状に形成され、軸線Ｘ3が軸線Ｃに対して
所定角度θ3だけ傾斜している。ここで、前記燃料噴射
弁の軸線Ｃは、弁体６の開閉方向と略一致する。That is, as shown in the plan view of FIG. 2 and the enlarged cross-sectional views of FIGS. 3 and 4, the first injection hole 12 has the outlet 12 thereof.
A is formed in a great circle shape having a diameter dimension D 1, and an axis X 1 is inclined with respect to an axis C of the fuel injection valve by a predetermined angle θ 1 . In addition, the outlet portion 13A of the second injection hole 13 is smaller in diameter D 2 than the diameter D 1 of the first injection hole 12.
Is formed in the shape of a middle circle, and the axis line X 2 is inclined with respect to the axis line C by a predetermined angle θ 2 . Further, the third injection hole 14 has an outlet portion 14A smaller in diameter than the diameter D 2 of the second injection hole 13 (D 3 (D 1 > D 2 > D 3 )).
Is formed in a small circle shape, and the axis X 3 is inclined at a predetermined angle θ 3 with respect to the axis C. Here, the axis C of the fuel injection valve substantially coincides with the opening / closing direction of the valve body 6.
【００３０】そして、各噴射孔１２，１３，１４の噴射
軸線Ｘ1，Ｘ2，Ｘ3は軸線Ｃ上の点Ｐで交差し、この交
差点Ｐで各噴射孔１２，１３，１４からそれぞれ噴射さ
れた燃料が互いに衝突するようになっている。なお、各
噴射軸線Ｘ1，Ｘ2，Ｘ3が同一平面上の一点で交差せ
ず、軸間距離がある場合でも、噴射された液体が互いに
衝突するように各噴射孔１２，１３，１４を設けること
も可能である。The injection axes X 1 , X 2 , X 3 of the injection holes 12, 13, 14 intersect at a point P on the axis C, and the injection holes 12, 13, 14 respectively inject at the intersection P. The injected fuel collides with each other. Even if the injection axis lines X 1 , X 2 , X 3 do not intersect at one point on the same plane and there is a distance between the axes, the injection holes 12, 13, 14 are arranged so that the injected liquids collide with each other. It is also possible to provide.
【００３１】ここで、３個の噴射孔１２，１３，１４の
うち、最も大きい出口部断面積Ｓ1を有する第１の噴射
孔１２と最も小さい出口部断面積Ｓ3を有する第３の噴
射孔１４とは、断面積Ｓ1，Ｓ3の平方根比α（α＝（Ｓ
1）1/2／（Ｓ3）1/2）が、後述する理由により１．２以
上となるように設定されている。Here, among the three injection holes 12, 13, 14, the first injection hole 12 having the largest outlet cross-sectional area S 1 and the third injection hole having the smallest outlet cross-sectional area S 3. the hole 14, the square root ratio of the cross-sectional area S 1, S 3 α (α = (S
1 ) 1/2 / (S 3 ) 1/2 ) is set to 1.2 or more for the reason described later.
【００３２】なお、１５は取付ステーであり、この取付
ステー１５を介して燃料噴射弁は吸気通路に取り付けら
れる。Reference numeral 15 is a mounting stay, and the fuel injection valve is mounted in the intake passage via the mounting stay 15.
【００３３】次に、本実施例の作用について説明する。Next, the operation of this embodiment will be described.
【００３４】まず、図５は、第１の噴射孔１２の出口部
１２Ａと第３の噴射孔１４の出口部１４Ａの断面積の平
方根比（以下、「口径比α」という）と共振との関係を
示す特性図であって、口径比αを変化させると、ある値
で非線形的な引込現象である共振が急速に強まることが
判明した。具体的には、口径比αが「１．０」のときの
共振の強さはＭ1と低いが、口径比αを「１．２」に上
げると、共振の強さは上昇し始め、口径比αが「１．
５」程度に達すると最大値Ｍ2をとる。従って、大中小
の３個の噴射孔１２，１３，１４のうち、最大径の噴射
孔１２と最小径の噴射孔１４との口径比αを「１．２以
上」に設定すれば、従来技術よりも強い共振を得ること
ができ、この強い共振現象を利用して燃料の微粒化を図
ることができる。First, FIG. 5 shows the square root ratio of the cross-sectional area of the outlet portion 12A of the first injection hole 12 and the outlet portion 14A of the third injection hole 14 (hereinafter referred to as "aperture ratio α") and resonance. It is a characteristic diagram showing the relationship, and it was found that when the aperture ratio α is changed, the resonance, which is a non-linear pull-in phenomenon, rapidly increases at a certain value. Specifically, the resonance strength when the aperture ratio α is “1.0” is as low as M 1 , but when the aperture ratio α is increased to “1.2”, the resonance strength starts to increase, The aperture ratio α is "1.
When it reaches about 5 ", it takes the maximum value M 2 . Therefore, if the aperture ratio α of the maximum diameter injection hole 12 and the minimum diameter injection hole 14 among the three large, medium, and small injection holes 12, 13, 14 is set to “1.2 or more”, the conventional technique is used. Stronger resonance can be obtained, and atomization of fuel can be achieved by utilizing this strong resonance phenomenon.
【００３５】さて、コントロールユニットからの制御信
号によって電磁アクチュエータ３が励磁され、弁体６が
コア５に吸引されると、燃料溜まり１０内の燃料は、弁
座部９の噴孔９Ａを介して各噴射孔１２，１３，１４に
流入し、これら各噴射孔１２，１３，１４を介して同時
にそれぞれ噴射される。そして、これら各噴射燃料は、
各軸線Ｃ，Ｘ1，Ｘ2，Ｘ3が交差する交差点Ｐで合流し
て斜め方向から互いに衝突し、上述した共振現象によっ
て微粒化された後、吸入空気とともに吸気ポートに運ば
れる。When the electromagnetic actuator 3 is excited by the control signal from the control unit and the valve body 6 is attracted to the core 5, the fuel in the fuel pool 10 is injected through the injection hole 9A of the valve seat 9. It flows into each injection hole 12, 13, 14 and is simultaneously injected through each of these injection holes 12, 13, 14. And each of these injected fuels
The axes C, X 1 , X 2 , X 3 merge at an intersection P where they intersect, and collide with each other from an oblique direction, and after being atomized by the above-mentioned resonance phenomenon, they are carried to the intake port together with the intake air.
【００３６】このように構成される本実施例によれば、
ノズル部材１１に互いに径の異なる３個の噴射孔１２，
１３，１４を穿設し、最大径を有する第１の噴射孔１２
の出口部１２Ａと最小径を有する第３の噴射孔１４の出
口部１４Ａとを、その断面積Ｓ1，Ｓ3の平方根比たる口
径比αが１．２以上となるように設定したため、各噴射
孔１２，１３，１４から噴射された３つの燃料の衝突時
に振動を生じさせることができ、図５に示す共振現象を
得ることができる。この結果、非常に薄い燃料の膜が分
裂して微小な液滴が生成し、微粒化が大幅に向上する。According to the present embodiment configured as described above,
The nozzle member 11 has three injection holes 12 of different diameters,
A first injection hole 12 having a maximum diameter by drilling 13, 14
The outlet portion 12A and the outlet portion 14A of the third injection hole 14 having the minimum diameter are set so that the aperture ratio α which is the square root ratio of the cross-sectional areas S 1 and S 3 is 1.2 or more. Vibration can be generated when the three fuels injected from the injection holes 12, 13, 14 collide with each other, and the resonance phenomenon shown in FIG. 5 can be obtained. As a result, a very thin fuel film is split to generate minute droplets, which greatly improves atomization.
【００３７】また、３つの噴射燃料を衝突させる構成の
ため、噴霧の広がり角度を抑えて指向性を高めることが
できると共に、粒径のバラツキを小さくできる。Further, since the three injected fuels are made to collide with each other, the spread angle of the spray can be suppressed to enhance the directivity, and the dispersion of the particle size can be reduced.
【００３８】さらに、最大の噴射孔１２と最小の噴射孔
１４とが、「１．２以上」の口径比αを有するように、
各噴射孔１２，１３，１４を形成するだけで微粒化性能
を向上できるため、設計の自由度が増大し、使い勝手が
高まる。Further, the maximum injection hole 12 and the minimum injection hole 14 have a diameter ratio α of "1.2 or more",
Since the atomization performance can be improved simply by forming the injection holes 12, 13, 14, the degree of freedom in design is increased and the usability is improved.
【００３９】一方、弁体６が開弁すると、燃料溜まり１
０からの燃料は、噴孔９Ａを介して各噴射孔１２，１
３，１４に同時に供給されるため、３つの噴射燃料流を
同時に衝突させて微粒化を行うことができる。即ち、例
えば弁体が直接的に３個の噴射孔を開閉する構成の場合
には、弁体の片開き等によって、３つの噴射孔から噴射
される燃料の噴出開始に時期的なずれが生じ、燃料を同
時に衝突させることができないおそれがあるが、本実施
例では、噴孔９Ａを介して間接的に燃料を供給するた
め、より信頼性が高い。On the other hand, when the valve body 6 opens, the fuel sump 1
Fuel from 0 is injected into each injection hole 12, 1 through the injection hole 9A.
Since they are supplied to 3 and 14 at the same time, it is possible to collide the three injected fuel streams at the same time for atomization. That is, for example, in the case where the valve body directly opens and closes the three injection holes, there is a time lag in the start of injection of the fuel injected from the three injection holes due to one-way opening of the valve body or the like. Although there is a possibility that the fuels cannot be made to collide at the same time, in this embodiment, the fuel is indirectly supplied through the injection holes 9A, so that the reliability is higher.
【００４０】次に、図６〜図９に基づき本発明の第２の
実施例を説明する。なお、以下の各実施例では前記第１
の実施例と同一の構成要素に同一の符号を付し、その説
明を省略するものとする。本実施例の特徴は、各噴射孔
１２，１３，１４から噴射された燃料が衝突する交差点
Ｐに向けてアシストエアを供給する点にある。Next, a second embodiment of the present invention will be described with reference to FIGS. In each of the following embodiments, the first
The same components as those of the embodiment are given the same reference numerals and the description thereof will be omitted. The feature of this embodiment is that the assist air is supplied toward the intersection P where the fuel injected from the injection holes 12, 13, 14 collides.
【００４１】即ち、本実施例によるケーシング本体２の
先端側には、弁座部材９の一端側を若干延長してなる筒
部２１が一体的に形成されており、この筒部２１には交
差点Ｐに向けて開口するエア噴射孔２２が径方向に穿設
されている。このエア噴射孔２２は、その流出側が交差
点Ｐの近傍を指向し、その流入側にはエア供給通路２３
を介して吸気通路に連通している。なお、アシストエア
の噴出方向は図中に示す横方向に限らず、斜め上側から
液体の噴霧方向に沿って噴出させてもよい。また、エア
噴射孔２２に対向する他のエア噴射孔を設け、アシスト
エアを両側から噴出させてもよい。That is, at the tip end side of the casing main body 2 according to the present embodiment, a cylinder portion 21 formed by slightly extending one end side of the valve seat member 9 is integrally formed. An air injection hole 22 that opens toward P is provided in the radial direction. The outflow side of the air injection hole 22 is oriented near the intersection P, and the inflow side of the air injection passage 23
Through the intake passage. The ejection direction of the assist air is not limited to the lateral direction shown in the figure, but may be ejected obliquely from the upper side along the liquid spray direction. Further, another air injection hole facing the air injection hole 22 may be provided to eject the assist air from both sides.
【００４２】このように構成される本実施例でも、上述
した第１の実施例とほぼ同様の効果を得ることができ
る。これに加えて、本実施例では、アシストエアをも用
いる構成としたため、より一層の微粒化を促進すること
ができる。Also in this embodiment having such a configuration, it is possible to obtain substantially the same effects as those of the above-mentioned first embodiment. In addition to this, in this embodiment, since the assist air is also used, further atomization can be promoted.
【００４３】次に、図１０に基づき本発明の第３の実施
例について説明する。本実施例の特徴は、各噴射孔の断
面形状を非円形状としての一例である楕円形状に形成し
た点にある。Next, a third embodiment of the present invention will be described with reference to FIG. The feature of this embodiment is that the cross-sectional shape of each injection hole is formed into an elliptical shape which is an example of a non-circular shape.
【００４４】即ち、本実施例によるノズル部材３１は、
第１の実施例で述べたノズル部材１１と同様に略円板状
に形成され、ケーシング本体２の先端側に装着されてい
ると共に、大きい短径寸法ＤS1を有する第１の噴射孔３
２と、中位の短径寸法ＤS2を有する第２の噴射孔３３
と、小さい短径寸法ＤS3を有する第３の噴射孔３４との
合計３個の噴射孔がそれぞれ穿設されている。これら各
噴射孔３２，３３，３４は、図示を省略しているが、第
１の実施例で述べた各噴射孔１２，１３，１４と同様
に、その軸線が燃料噴射弁の軸線Ｃに対してそれぞれ傾
斜し、ノズル部材３１の外部に存在する点Ｐで交差して
いる。That is, the nozzle member 31 according to the present embodiment is
Similar to the nozzle member 11 described in the first embodiment, the first injection hole 3 is formed in a substantially disc shape, is mounted on the tip side of the casing body 2, and has a large minor diameter dimension D S1.
2 and a second injection hole 33 having a medium minor axis dimension D S2
And a third injection hole 34 having a small minor axis dimension D S3 , a total of three injection holes are provided. Although not shown in the drawings, these injection holes 32, 33, 34 have their axes relative to the axis C of the fuel injection valve, like the injection holes 12, 13, 14 described in the first embodiment. Respectively, and they intersect at a point P existing outside the nozzle member 31.
【００４５】そして、各噴射孔３２，３３，３４の出口
部３２Ａ，３３Ａ，３４Ａは、その断面形状が非円形の
楕円形状に形成され、最大の短径寸法ＤS1を有する第１
の噴射孔３２の出口部３２Ａの断面積と最小の短径寸法
ＤS3を有する第３の噴射孔３４の出口部３４Ａの断面積
の平方根の比が本実施例における口径比αとなり、この
口径比αは１．２以上の範囲に設定されている。The outlet portions 32A, 33A, 34A of the respective injection holes 32, 33, 34 are formed in an elliptical shape having a non-circular cross section, and have the maximum minor diameter dimension D S1 .
The ratio of the square root of the cross-sectional area of the outlet portion 32A of the injection hole 32 to the square root of the cross-sectional area of the outlet portion 34A of the third injection hole 34 having the smallest minor diameter dimension D S3 becomes the aperture ratio α in the present embodiment. The ratio α is set in the range of 1.2 or more.
【００４６】このように構成される本実施例でも、前記
第１の実施例とほぼ同様の効果を奏する。これに加え
て、本実施例では、３個の噴射孔３２，３３，３４の断
面形状を楕円形状に形成する構成としたため、断面が真
円形状をなす第１の実施例よりも一層効果的に微粒化を
促進することができる。また、燃料の噴霧に指向性を持
たせるのが可能となり、吸気ポートの形状に対応した最
適な方向に微粒化燃料を噴射することができる。なお、
本実施例では、「非円形状」として楕円形を例示した
が、これに限らず、三角形状、矩形状、星形状等の他の
形状を採用することもできる。また、各噴射孔３２，３
３，３４の向き、即ち本実施例における楕円の長径方向
の向きは、図１０に示す状態に限らず、例えば図１０に
示す方向と直交するように配置してもよく、あるいは軸
線Ｃを指向するように配置する等の如く、互いに向きを
違えて形成してもよい。This embodiment, which is constructed as described above, also has substantially the same effect as that of the first embodiment. In addition to this, in the present embodiment, the three injection holes 32, 33, and 34 are formed to have an elliptical cross-sectional shape, which is more effective than the first embodiment in which the cross-section has a perfect circular shape. Moreover, atomization can be promoted. Further, it becomes possible to give directionality to the fuel spray, and it is possible to inject the atomized fuel in the optimum direction corresponding to the shape of the intake port. In addition,
In this embodiment, an elliptical shape is illustrated as the “non-circular shape”, but the shape is not limited to this, and other shapes such as a triangular shape, a rectangular shape, and a star shape can be adopted. In addition, each injection hole 32, 3
The orientations of 3, 34, that is, the orientation of the ellipse in the major axis direction in the present embodiment is not limited to the state shown in FIG. 10, and may be arranged, for example, so as to be orthogonal to the direction shown in FIG. They may be formed so as to face each other such that they are arranged so that
【００４７】次に、図１１〜図１３に基づいて本発明の
第４の実施例を説明する。本実施例の特徴は、３個の噴
射孔からなる噴射孔群を２つ設けた点にある。Next, a fourth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that two injection hole groups each including three injection holes are provided.
【００４８】本実施例によるノズル部材４１は、第１の
実施例で述べたノズル部材１１と同様に、ケーシング本
体２の先端側を施蓋して設けられているものの、第１の
実施例とは異なり、３個１組の噴射孔群が合計２組設け
られている。即ち、図１２にも示す如く、各噴射孔群
は、大円状の第１の噴射孔４２と、中円状の第２の噴射
孔４３と、小円状の第３の噴射孔４４とからなり、各噴
射孔群は互いに径方向に離間している。Like the nozzle member 11 described in the first embodiment, the nozzle member 41 according to the present embodiment is provided with the tip end side of the casing main body 2 covered, but it is the same as the first embodiment. In contrast, a total of two injection hole groups each including three injection holes are provided. That is, as shown in FIG. 12, each injection hole group includes a first injection hole 42 having a great circle shape, a second injection hole 43 having a middle circle shape, and a third injection hole 44 having a small circle shape. The injection hole groups are separated from each other in the radial direction.
【００４９】ここで、これら各噴射孔群を構成する各噴
射孔４２，４３，４４の出口部４２Ａ，４３Ａ，４４Ａ
は、図１３にも示す如く、それぞれ大きい口径寸法
Ｄ4，中位の口径寸法Ｄ5，小さい口径寸法Ｄ6を有し、
その噴射軸線Ｘ4，Ｘ5，Ｘ6はノズル部材４１の外部の
点Ｐで交差している。また、第１の実施例で述べたと同
様に、各噴射孔群において、最大径を有する噴射孔４２
の出口部４２Ａの断面積と最小径を有する噴射孔４４の
出口部４４Ａの断面積との平方根比（口径比α）は、
１．２以上となるように設定されている。なお、図１３
では、各噴射孔４２，４３，４４の構成を明確化すべ
く、軸線Ｘ4，Ｘ5，Ｘ6を捨象している。Here, the outlet portions 42A, 43A, 44A of the respective injection holes 42, 43, 44 which constitute these respective injection hole groups.
Has a large diameter dimension D 4 , a medium diameter dimension D 5 , and a small diameter dimension D 6 , respectively, as shown in FIG.
The injection axis lines X 4 , X 5 , X 6 intersect at a point P outside the nozzle member 41. Further, in the same manner as described in the first embodiment, in each injection hole group, the injection hole 42 having the maximum diameter is formed.
The square root ratio (caliber ratio α) between the cross-sectional area of the outlet portion 42A and the cross-sectional area of the outlet portion 44A of the injection hole 44 having the minimum diameter is
It is set to be 1.2 or more. Note that FIG.
Then, in order to clarify the configuration of each of the injection holes 42, 43, 44, the axis lines X 4 , X 5 , X 6 are omitted.
【００５０】かくして、このように構成される本実施例
でも、上述した第１の実施例と同様の効果を得ることが
できる。これに加えて本実施例では、大中小の３個の噴
射孔４２，４３，４４からなる噴射孔群を２組設ける構
成としたため、微粒化燃料を２方向に分けて噴霧するこ
とができる。従って、吸気ポートが２つある場合に、各
吸気ポートに向けて微粒化燃料を噴霧供給することがで
き、使い勝手を向上できる。Thus, in this embodiment having such a configuration, the same effect as that of the above-described first embodiment can be obtained. In addition to this, in the present embodiment, since two sets of injection hole groups consisting of three injection holes 42, 43, and 44 of large, medium, and small are provided, atomized fuel can be sprayed separately in two directions. Therefore, when there are two intake ports, atomized fuel can be sprayed and supplied to each intake port, and usability can be improved.
【００５１】なお、本実施例では、各噴射孔群を構成す
る噴射孔４２，４３，４４の口径寸法と噴射軸線の傾き
角度とを、ともに等しくした場合を例示したが、本発明
はこれに限らず、一方の噴射孔群を構成する３個の噴射
孔の断面積等と他方の噴射孔群を構成する３個の噴射孔
の断面積等とを違えてもよい。例えば、一方の噴射孔群
を直径１００μｍの噴射孔と直径１５０μｍの噴射孔と
直径２００μｍの噴射孔とから構成し、他方の噴射孔群
を直径１２０μｍの噴射孔と直径１８０μｍの噴射孔と
直径２４０μｍの噴射孔とから構成したり、あるいは各
噴射孔群の噴射軸線の傾き角度を互いに変えたりするこ
ともできる。噴射軸線の傾き角度を違えれば、交差点Ｐ
の位置を一方の噴射孔群と他方の噴射孔群とで異ならせ
ることができる。従って、例えば気筒の上層と下層とで
燃料粒子の粒径を変化させることもでき、使い勝手を向
上することができる。また、２組の噴射孔群を設ける場
合を例示したが、これに限らず、３組以上の噴射孔群を
設けてもよい。In the present embodiment, the case where the diameters of the injection holes 42, 43, 44 constituting each injection hole group and the inclination angle of the injection axis are both equal has been exemplified, but the present invention is not limited to this. However, the cross-sectional area of the three injection holes forming one injection hole group and the cross-sectional area of the three injection holes forming the other injection hole group may be different. For example, one injection hole group is composed of 100 μm diameter injection holes, 150 μm diameter injection holes and 200 μm diameter injection holes, and the other injection hole group is 120 μm diameter injection holes, 180 μm diameter injection holes and 240 μm diameter. Of the injection holes, or the inclination angle of the injection axis of each injection hole group can be changed from each other. If the inclination angle of the injection axis is different, the intersection P
The position of can be made different between the one injection hole group and the other injection hole group. Therefore, for example, the particle size of the fuel particles can be changed between the upper layer and the lower layer of the cylinder, and the usability can be improved. Moreover, although the case where two sets of injection hole groups are provided has been illustrated, the present invention is not limited to this, and three or more sets of injection hole groups may be provided.
【００５２】次に、図１４，図１５に基づいて本発明の
第５の実施例を説明する。本実施例の特徴は、各噴射孔
を噴射軸線に沿って断面積が徐々に変化するテーパ状に
形成した点にある。Next, a fifth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that each injection hole is formed in a tapered shape whose cross-sectional area gradually changes along the injection axis.
【００５３】即ち、本実施例によるノズル部材５１は、
第１の実施例で述べたノズル部材１１と同様に、ケーシ
ング本体２の先端側に装着され、大円状をなす第１の噴
射孔５２と、中円状をなす第２の噴射孔５３と、小円状
をなす第３の噴射孔５４との合計３個の噴射孔が穿設さ
れている。また、各噴射孔５２，５３，５４の各出口部
５２Ａ，５３Ａ，５Ａは、大きい口径寸法Ｄ1，中位の
口径寸法Ｄ2，小さい口径寸法Ｄ3を有し、その噴射軸線
Ｘ1，Ｘ2，Ｘ3は燃料噴射弁の軸線Ｃ上の点Ｐで交差し
ている。さらに、３個の噴射孔５２，５３，５４のう
ち、最大径を有する噴射孔５２の出口部５２Ａの断面積
と最小径を有する噴射孔５４の出口部５４Ａの断面積と
の平方根比たる口径比αは、前記各実施例で述べたと同
様に、１．２以上に設定されている。ここで、本実施例
による３個の噴射孔５２，５３，５４は、第１の実施例
で述べた各噴射孔１２，１３，１４とは異なり、その噴
射軸線Ｘ1，Ｘ2，Ｘ3に沿って下流側（噴射方向）に向
かうにつれて断面積が徐々に拡径するテーパ状に形成さ
れている。That is, the nozzle member 51 according to this embodiment is
Similar to the nozzle member 11 described in the first embodiment, the first injection hole 52 having a great circle shape and attached to the front end side of the casing body 2 and the second injection hole 53 having a middle circle shape are provided. , And a total of three injection holes including the third injection hole 54 having a small circular shape. The outlet portions 52A, 53A, 5A of the respective injection holes 52, 53, 54 have a large diameter dimension D 1 , a medium diameter dimension D 2 , and a small diameter dimension D 3 , and their injection axis X 1 , X 2 and X 3 intersect at a point P on the axis C of the fuel injection valve. Further, among the three injection holes 52, 53, 54, the diameter that is the square root ratio of the cross-sectional area of the outlet portion 52A of the injection hole 52 having the maximum diameter and the cross-sectional area of the outlet portion 54A of the injection hole 54 having the minimum diameter. The ratio α is set to 1.2 or more, as in the above-mentioned embodiments. Here, the three injection holes 52, 53, 54 according to the present embodiment are different from the injection holes 12, 13, 14 described in the first embodiment, and the injection axis lines X 1 , X 2 , X 3 thereof. The cross-sectional area is tapered so that the diameter gradually increases toward the downstream side (injection direction).
【００５４】かくして、このように構成される本実施例
でも、上述した第１の実施例と同様の効果を得ることが
できる。これに加えて本実施例では、３個の噴射孔５
２，５３，５４を、噴射軸線Ｘ1，Ｘ2，Ｘ3の噴射方向
に向けて徐々に拡径するテーパ状に形成する構成とした
ため、各噴射孔５２，５３，５４を容易に形成すること
ができる。Thus, in this embodiment having such a structure, the same effect as that of the first embodiment described above can be obtained. In addition to this, in this embodiment, three injection holes 5 are provided.
The injection holes 52, 53, and 54 are easily formed because the injection holes 52, 53, and 54 are formed in a tapered shape that gradually increases in diameter in the injection direction of the injection axis lines X 1 , X 2 , and X 3. be able to.
【００５５】次に、図１６，図１７に基づいて本発明の
第６の実施例を説明する。本実施例の特徴は、３個の噴
射孔の噴射軸線を同一平面上に配置した点にある。Next, a sixth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that the injection axis lines of the three injection holes are arranged on the same plane.
【００５６】本実施例によるノズル部材６１も、第１の
実施例で述べたノズル部材１１と同様に、略円板状に形
成され、ケーシング本体２の先端側に装着されていると
共に、大中小の３個の噴射孔６２，６３，６４が穿設さ
れている。Similarly to the nozzle member 11 described in the first embodiment, the nozzle member 61 according to the present embodiment is also formed into a substantially disc shape, is attached to the tip side of the casing body 2, and is large, medium and small. No. 3 injection holes 62, 63, 64 are provided.
【００５７】また、図１７にも示す如く、第１の噴射孔
６２の出口部６２Ａは大きな口径寸法Ｄ1を有する大円
状に形成され、第２の噴射孔６３の出口部６３Ａは中位
の口径寸法Ｄ2を有する中円状に形成され、第３の噴射
孔６４の出口部６４Ａは小さな口径寸法Ｄ3を有する小
円状に形成されており、最大径を有する出口部６２Ａの
断面積と最小径を有する出口部６４Ａの断面積との平方
根比たる口径比αは、１．２以上となるように設定され
ている。Also, as shown in FIG. 17, the outlet portion 62A of the first injection hole 62 is formed in a large circle shape having a large diameter dimension D 1, and the outlet portion 63A of the second injection hole 63 is at the middle position. is formed in a circular shape in having a caliber dimension D 2, the outlet portion 64A of the third injection hole 64 is formed in a small circle having a small diameter dimension D 3, the cross-sectional outlet portion 62A having a maximum diameter The aperture ratio α, which is the square root ratio between the area and the cross-sectional area of the outlet portion 64A having the minimum diameter, is set to 1.2 or more.
【００５８】ここで、本実施例による各噴射孔６２，６
３，６４は、その噴射軸線Ｘ1，Ｘ2，Ｘ3が軸線Ｃを含
む同一平面上に位置して横一列に形成されており、該各
噴射軸線Ｘ1，Ｘ2，Ｘ3はノズル部材６１の外部の点Ｐ
で交差している。Here, the respective injection holes 62, 6 according to the present embodiment.
3, 64 have their injection axis lines X 1 , X 2 , X 3 located on the same plane including the axis line C and are formed in a horizontal row. The respective injection axis lines X 1 , X 2 , X 3 are nozzles. Point P outside member 61
Cross at.
【００５９】かくして、このように構成される本実施例
でも、上述した第１の実施例と同様の効果を得ることが
できる。これに加えて本実施例では、３個の噴射孔６
２，６３，６４を、噴射軸線Ｘ1，Ｘ2，Ｘ3が同一平面
上に位置するようにして横一列に形成したため、偏平な
噴霧パターンを得られる。即ち、本実施例によれば、円
錐状に広がる噴霧パターンではなく、扇状に広がる偏平
な噴霧パターンを得ることができる。Thus, in this embodiment having such a configuration, the same effect as that of the above-described first embodiment can be obtained. In addition to this, in this embodiment, three injection holes 6 are provided.
Since the nozzles 2 , 63, 64 are formed in a horizontal row so that the injection axes X 1 , X 2 , X 3 are located on the same plane, a flat spray pattern can be obtained. That is, according to the present embodiment, it is possible to obtain a flat spray pattern that spreads in a fan shape, rather than a spray pattern that spreads in a conical shape.
【００６０】次に、図１８〜図２０に基づき本発明の第
７の実施例について説明する。本実施例の特徴は、サッ
クホールが可及的に小さいサックレス型の燃料噴射弁に
用いた点にある。Next, a seventh embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that it is used for a suckless fuel injection valve having a suck hole as small as possible.
【００６１】燃料噴射弁のノズル本体を形成するケーシ
ング７１は、筒状のケーシング本体７１Ａと、このケー
シング本体７１Ａの一端側に一体的に形成された円錐筒
状の先端部７１Ｂとから構成されており、ケーシング７
１の他端側には図示せぬ電磁アクチュエータや弁ばね等
が収容されている。The casing 71 forming the nozzle body of the fuel injection valve is composed of a tubular casing body 71A and a conical tubular tip portion 71B integrally formed on one end side of the casing body 71A. Cage, casing 7
An electromagnetic actuator (not shown), a valve spring, and the like are housed on the other end side of 1.
【００６２】ケーシング７１の先端部７１Ｂには、大中
小の３個の噴射孔７２，７３，７４が燃料噴射弁の軸線
Ｃ方向に離間して径方向に穿設されている。具体的に
は、図１９及び図２０にも示す如く、第１の噴射孔７２
の出口部７２Ａは大きな口径寸法Ｄ1を有する大円状に
形成され、ケーシング７１内に画成された燃料流路７５
の上流側（図中の上側）に位置している。また、第２の
噴射孔７３の出口部７３Ａは、中位の口径寸法Ｄ2を有
する中円状に形成され、第１の噴射孔７２よりも下流側
に設けられている。さらに、第３の噴射孔７４の出口部
７４Ａは、小さな口径寸法Ｄ3を有する小円状に形成さ
れ、第２の噴射孔７３と同様に第１の噴射孔７２の下流
側に軸線Ｃ方向に離間して位置し、かつ第２の噴射孔７
３と周方向に離間して設けられている。Three large, medium and small injection holes 72, 73 and 74 are radially formed in the tip portion 71B of the casing 71 while being separated in the direction of the axis C of the fuel injection valve. Specifically, as shown in FIGS. 19 and 20, the first injection hole 72
The outlet portion 72A is formed into a large circle having a large diameter dimension D 1 and is defined in the casing 71.
It is located on the upstream side (upper side in the figure) of. Further, the outlet portion 73A of the second injection hole 73 is formed in the shape of a middle circle having a medium diameter dimension D 2 , and is provided on the downstream side of the first injection hole 72. Furthermore, the outlet portion 74A of the third injection hole 74 is formed in a small circle having a small diameter dimension D 3, the axis C direction on the downstream side of the first injection hole 72 similarly to the second injection hole 73 And the second injection hole
3 is provided so as to be separated from the circumferential direction.
【００６３】ここで、第１の実施例で述べたと同様に、
これら３個の噴射孔７２，７３，７４は、その噴射軸線
Ｘ1，Ｘ2，Ｘ3がケーシング７１の外部にある点Ｐで交
差するように穿設されていると共に、最大径を有する出
口部７２Ａの断面積と最小径を有する出口部７４Ａの断
面積との平方根比たる口径比αは、１．２以上となるよ
うに設定されている。Here, as described in the first embodiment,
These three injection holes 72, 73, 74 are formed such that their injection axis lines X 1 , X 2 , X 3 intersect at a point P outside the casing 71, and have an outlet having a maximum diameter. The aperture ratio α, which is the square root ratio between the cross-sectional area of the portion 72A and the cross-sectional area of the outlet portion 74A having the minimum diameter, is set to 1.2 or more.
【００６４】ケーシング７１内に移動可能に配設された
弁体７６は、棒状の弁軸７６Ａと、この弁軸７６Ａの一
端側に一体的に形成された略円錐状の弁部７６Ｂとから
構成され、弁部７６Ｂの他端側にはケーシング７１の先
端部７１Ｂに接触してシールを行うシート部７６Ｃが設
けられている。そして、この弁体７６は、コントロール
ユニット（図示せず）からの制御信号によって電磁アク
チュエータが電磁力を発生させると、この電磁力に吸引
され、弁ばねのばね力に抗して開弁するようになってい
る。The valve body 76 movably arranged in the casing 71 comprises a rod-shaped valve shaft 76A and a substantially conical valve portion 76B integrally formed at one end of the valve shaft 76A. In addition, a seat portion 76C for contacting and sealing the tip portion 71B of the casing 71 is provided on the other end side of the valve portion 76B. Then, when the electromagnetic actuator generates an electromagnetic force by a control signal from a control unit (not shown), the valve body 76 is attracted by this electromagnetic force and opens the valve against the spring force of the valve spring. It has become.
【００６５】かくして、このように構成される本実施例
でも、各噴射軸線Ｘ1，Ｘ2，Ｘ3がケーシング７１の外
部の点Ｐで交差するようにして３個の噴射孔７２，７
３，７４を設け、最大径の噴射孔７２と最小径の噴射孔
７４との口径比αを１．２以上に設定する構成としたた
め、第１の実施例と同様に、燃料を効果的に微粒化する
ことができる。これに加えて、本実施例では、最大径の
噴射孔７２を燃料流路７５の上流側に配置する一方、中
間径の噴射孔７３及び最小径の噴射孔７４を燃料流路７
５の下流側に配置する構成を採用したため、これら３個
の噴射孔７２，７３，７４からそれぞれ噴射される燃料
の粒径に生じる差異を小さくして、より一層有効に共振
現象を利用することができ、微粒化を促進できる。Thus, also in this embodiment configured as described above, the three injection holes 72, 7 are arranged so that the injection axis lines X 1 , X 2 , X 3 intersect at a point P outside the casing 71.
3, 74 are provided, and the aperture ratio α between the maximum diameter injection hole 72 and the minimum diameter injection hole 74 is set to 1.2 or more. Therefore, as in the first embodiment, the fuel is effectively used. It can be atomized. In addition to this, in the present embodiment, the maximum diameter injection hole 72 is arranged on the upstream side of the fuel flow path 75, while the intermediate diameter injection hole 73 and the minimum diameter injection hole 74 are arranged.
Since the configuration of arranging on the downstream side of No. 5 is adopted, the difference caused in the particle size of the fuel injected from each of these three injection holes 72, 73, 74 is reduced, and the resonance phenomenon is used more effectively. It is possible to promote atomization.
【００６６】即ち、仮に、中間径の噴射孔７３及び最小
径の噴射孔７４を燃料流路７５の上流側に配置し、最大
径の噴射孔７２を燃料流路７５の下流側に設けたなら
ば、最大径の噴射孔７２に加わる圧力が低下して噴射燃
料の粒径が大きくなる一方、中間径の噴射孔７３及び最
小径の噴射孔７４に作用する圧力が上昇して噴射燃料の
粒径が小さくなる。従って、この場合は、最大径の噴射
孔７２から噴射される燃料の粒径と中間径の噴射孔７３
及び最小径の噴射孔７４から噴射される燃料の粒径との
間に比較的大きな差異が生じ、粒径の大きな燃料が粒径
の小さな燃料を貫通したりするため、上述した共振現象
を十分に利用することができない。これに対し、本実施
例では、最大径の噴射孔７２を上流側に配置し、中間径
の噴射孔７３及び最小径の噴射孔７４を下流側に配置す
るため、下流側の噴射孔７３，７４に加わる圧力は多少
低下するが、これら各噴射孔７３，７４の断面積はそも
そも小さいため、各噴射孔７２，７３，７４から噴射さ
れる燃料の流速に生じる差異を抑制して粒径の相違を小
さくすることができる。従って、本実施例によれば、よ
り有効に共振現象を利用して微粒化を促進することがで
きる。That is, if the intermediate diameter injection hole 73 and the minimum diameter injection hole 74 are arranged on the upstream side of the fuel flow passage 75 and the maximum diameter injection hole 72 is provided on the downstream side of the fuel flow passage 75. For example, the pressure applied to the maximum diameter injection hole 72 decreases and the particle size of the injected fuel increases, while the pressure acting on the intermediate diameter injection hole 73 and the minimum diameter injection hole 74 increases and the injected fuel particle size increases. The diameter becomes smaller. Therefore, in this case, the diameter of the fuel injected from the injection hole 72 of the maximum diameter and the injection hole 73 of the intermediate diameter
And a relatively large difference between the particle diameter of the fuel injected from the injection hole 74 having the smallest diameter, and the fuel having a large particle diameter penetrates the fuel having a small particle diameter. Cannot be used for. On the other hand, in this embodiment, the maximum diameter injection hole 72 is arranged on the upstream side, and the intermediate diameter injection hole 73 and the minimum diameter injection hole 74 are arranged on the downstream side. Although the pressure applied to 74 is somewhat reduced, since the cross-sectional area of each of these injection holes 73, 74 is small in the first place, the difference that occurs in the flow velocity of the fuel injected from each injection hole 72, 73, 74 is suppressed and the particle size is reduced. The difference can be reduced. Therefore, according to this embodiment, atomization can be promoted more effectively by utilizing the resonance phenomenon.
【００６７】次に、図２１〜図２５に基づいて本発明の
第８の実施例を説明する。本実施例の特徴は、ノズル部
材に４個の噴射孔を穿設し、これら４個の噴射軸線を交
差させた点にある。Next, an eighth embodiment of the present invention will be described with reference to FIGS. The feature of the present embodiment is that four nozzle holes are formed in the nozzle member and these four nozzle axes intersect.
【００６８】本実施例によるノズル部材８１も、前記第
１の実施例で述べたノズル部材１１と同様に、ケーシン
グ本体２の先端側に液密に装着されている。このノズル
部材８１には、前記各実施例と異なり、「４個以上の噴
射孔」の一例として、４個の噴射孔８２，８３，８４，
８５が形成されている。Similarly to the nozzle member 11 described in the first embodiment, the nozzle member 81 according to the present embodiment is also liquid-tightly mounted on the tip side of the casing body 2. Unlike the above-described embodiments, the nozzle member 81 has four injection holes 82, 83, 84, as an example of "four or more injection holes".
85 are formed.
【００６９】即ち、図２２〜図２４にも示す如く、第１
の噴射孔８２は、その出口部８２Ａが最大の口径寸法Ｄ
1を有する大径状に形成され、その噴射軸線Ｘ1は燃料噴
射弁の軸線Ｃに対して所定角度θ1だけ傾斜している。
また、第２の噴射孔８３は、その出口部８３Ａが比較的
大きな口径寸法Ｄ2を有する大径状に形成され、その噴
射軸線Ｘ2は軸線Ｃに対して所定角度θ2だけ傾斜してい
る。さらに、第３の噴射孔８４は、その出口部８４Ａが
中位の口径寸法Ｄ3を有する中円状に形成され、その噴
射軸線Ｘ3が軸線Ｃに対して所定角度θ3だけ傾斜してい
る。最後に、第４の噴射孔８５は、その出口部８５Ａが
小さな口径寸法Ｄ4を有する小円状に形成され、その噴
射軸線Ｘ4が軸線Ｃに対して所定角度θ4だけ傾斜してい
る。従って、口径寸法の大小関係は、下記数１に示す通
りである。That is, as shown in FIGS. 22 to 24, the first
The injection hole 82 has a maximum diameter D at the outlet portion 82A.
Is formed larger径状having 1, is inclined by a predetermined angle theta 1 with respect to the axis C of the injection axis X 1 is a fuel injection valve.
Further, the second injection hole 83 is formed in a large diameter shape in which the outlet portion 83A has a relatively large diameter dimension D 2 , and the injection axis line X 2 is inclined with respect to the axis line C by a predetermined angle θ 2. There is. The third injection hole 84, the outlet portion 84A is formed in a circular shape in having a diameter dimension D 3 medium, the injection axis X 3 is inclined by a predetermined angle theta 3 with respect to the axis C There is. Finally, the fourth injection hole 85 is formed in a small circle shape with its outlet portion 85A having a small diameter dimension D 4 , and its injection axis X 4 is inclined with respect to the axis C by a predetermined angle θ 4 . . Therefore, the size relationship of the aperture size is as shown in the following mathematical expression 1.
【００７０】[0070]
【数１】Ｄ1＞Ｄ2＞Ｄ3＞Ｄ4 そして、各噴射孔８２，８３，８４，８５の噴射軸線Ｘ
1，Ｘ2，Ｘ3，Ｘ4は、ノズル部材８１の外部に存在する
点Ｐで交差している。## EQU1 ## D 1 > D 2 > D 3 > D 4 and the injection axis X of each injection hole 82, 83, 84, 85.
1 , X 2 , X 3 and X 4 intersect at a point P existing outside the nozzle member 81.
【００７１】次に、本実施例による燃料噴射弁の作用に
ついて説明する。まず、図２５は最大径を有する第１の
噴射孔８２の出口部８２Ａの断面積Ｓ1と最小径を有す
る第４の燃料噴射孔８５の出口部８５Ａの断面積との平
方根比たる口径比αと４個以上の噴射孔により得られる
共振との関係を示す特性図であって、４個以上の噴射孔
の断面積がともに等しい場合（α＝１．０）には、共振
の強さは低い値Ｍ3となっている。そして、４個以上の
噴射孔のうち少なくとも一の噴射孔の断面積を他の噴射
孔の断面積と違えると（α＞１．０。口径比αは最大断
面積の平方根を最小断面積の平方根で割って求められる
もの故、α≠１．０はα＞１．０を意味する。）、共振
の強さは急速に高まり、最大値Ｍ4をとる。即ち、図２
５から明らかなように、４個以上の噴射孔を備えている
場合には、少なくともいずれか１個の噴射孔の断面積を
他の噴射孔の断面積と異ならせれば、強い共振効果を得
られる。Next, the operation of the fuel injection valve according to this embodiment will be described. First, FIG. 25 shows a diameter ratio which is a square root ratio between a cross-sectional area S 1 of the outlet portion 82A of the first injection hole 82 having the maximum diameter and a cross-sectional area of the outlet portion 85A of the fourth fuel injection hole 85 having the minimum diameter. FIG. 9 is a characteristic diagram showing the relationship between α and resonance obtained by four or more injection holes, and when the cross-sectional areas of four or more injection holes are both equal (α = 1.0), the resonance strength Has a low value M 3 . When the cross-sectional area of at least one of the four or more injection holes is different from the cross-sectional area of the other injection holes (α> 1.0, the aperture ratio α is the square root of the maximum cross-sectional area of the minimum cross-sectional area). Since it is obtained by dividing by the square root, α ≠ 1.0 means α> 1.0.), The strength of resonance rapidly increases and takes the maximum value M 4 . That is, FIG.
As is clear from FIG. 5, when four or more injection holes are provided, a strong resonance effect can be obtained by making the cross-sectional area of at least one injection hole different from the cross-sectional area of other injection holes. To be
【００７２】なお、最大の共振強さＭ4を得るのに必要
最低限の口径比αをαMAXとすれば、このαMAXは、およ
そ「１．３〜１．７」の範囲に入っている。従って、好
ましくは、４個以上の噴射孔のうち少なくとも一の噴射
孔の断面積と他の噴射孔の断面積との平方根比（口径比
α）を「１．３以上」に設定するとよい。また、より好
ましくは口径比αを「１．５以上」に設定すればよい。Assuming that the minimum aperture ratio α required to obtain the maximum resonance strength M 4 is α MAX , this α MAX falls within the range of about “1.3 to 1.7”. There is. Therefore, preferably, the square root ratio (caliber ratio α) of the cross-sectional area of at least one of the four or more injection holes and the cross-sectional area of the other injection hole is set to “1.3 or more”. Further, more preferably, the aperture ratio α may be set to “1.5 or more”.
【００７３】さて、コントロールユニットからの噴射信
号が電磁アクチュエータに印加されて弁体６が開弁する
と、４個の噴射孔８２，８３，８４，８５から同時に燃
料が噴射される。そして、この４つの噴射燃料は、ノズ
ル部材８１の外部にある点Ｐで互いに衝突し、上述した
共振現象によって微粒化される。Now, when the injection signal from the control unit is applied to the electromagnetic actuator and the valve body 6 is opened, fuel is injected from the four injection holes 82, 83, 84, 85 at the same time. Then, the four injected fuels collide with each other at a point P outside the nozzle member 81, and are atomized by the resonance phenomenon described above.
【００７４】従って、このように構成される本実施例で
も、上述した第１の実施例と同様の効果を得ることがで
きる。これに加えて本実施例では、４個の噴射孔８２，
８３，８４，８５を設け、少なくとも一の噴射孔の断面
積を他の噴射孔の断面積と違えるだけの構成を採用した
ため、前記第１〜第７の実施例とは異なり、噴射孔間の
口径比を考慮せずとも、強い共振現象を利用して有効に
微粒化を促進することができる。従って、噴射孔を４個
以上形成するにも拘わらず、却って設計の自由度が大幅
に向上し、使い勝手を高めることができる。Therefore, in this embodiment having such a configuration, the same effect as that of the above-described first embodiment can be obtained. In addition to this, in this embodiment, four injection holes 82,
83, 84, 85 are provided, and the structure in which the cross-sectional area of at least one injection hole is different from the cross-sectional area of the other injection hole is adopted. Therefore, unlike the first to seventh embodiments, the space between the injection holes is different. The atomization can be effectively promoted by utilizing the strong resonance phenomenon without considering the aperture ratio. Therefore, despite the fact that four or more injection holes are formed, the degree of freedom in design is greatly improved and usability can be improved.
【００７５】次に、図２６〜図２９に基づいて本発明の
第９の実施例について説明する。なお、本実施例では、
上述した第２の実施例及び第８の実施例と同一の構成要
素に同一の符号を付し、その説明を省略するものとす
る。本実施例の特徴は、第８の実施例にアシストエアを
用いた点にある。Next, a ninth embodiment of the present invention will be described with reference to FIGS. In this example,
The same components as those in the above-described second and eighth embodiments are designated by the same reference numerals, and the description thereof will be omitted. The feature of this embodiment is that assist air is used in the eighth embodiment.
【００７６】即ち、本実施例によるケーシング本体２の
先端側には、第２の実施例で述べたと同様に、弁座部材
９の一端側を若干延長してなる筒部２１が一体的に形成
されており、この筒部２１には交差点Ｐに向けて開口す
るエア噴射孔２２が径方向に穿設されている。このエア
噴射孔２２は、その流出側が交差点Ｐの近傍を指向し、
その流入側にはエア供給通路２３を介して吸気通路に連
通している。なお、アシストエアの噴出方向は図中に示
す横方向に限らず、斜め上側から液体の噴霧方向に沿っ
て噴出させてもよい。また、エア噴射孔２２に対向する
他のエア噴射孔を設け、アシストエアを両側から噴出さ
せてもよい。That is, at the front end side of the casing main body 2 according to this embodiment, as in the second embodiment, the tubular portion 21 formed by slightly extending one end side of the valve seat member 9 is integrally formed. An air injection hole 22 that opens toward the intersection P is formed in the tubular portion 21 in the radial direction. The outflow side of the air injection hole 22 is directed near the intersection P,
The inflow side communicates with the intake passage via the air supply passage 23. The ejection direction of the assist air is not limited to the lateral direction shown in the figure, but may be ejected obliquely from the upper side along the liquid spray direction. Further, another air injection hole facing the air injection hole 22 may be provided to eject the assist air from both sides.
【００７７】このように構成される本実施例でも、上述
した第８の実施例とほぼ同様の効果を得ることができ
る。これに加えて、本実施例では、アシストエアをも用
いる構成としたため、設計の自由度を高めつつ一層の微
粒化することができる。Also in this embodiment having such a structure, it is possible to obtain substantially the same effects as those of the above-mentioned eighth embodiment. In addition to this, in the present embodiment, since the assist air is also used, the degree of freedom in design can be increased and further atomization can be achieved.
【００７８】次に、図３０，図３１に基づいて本発明の
第１０の実施例を説明する。本実施例の特徴は、４個の
噴射孔の断面形状を非円形状としての楕円形に形成した
点にある。Next, a tenth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that the cross-sectional shape of the four injection holes is formed in an elliptical shape as a non-circular shape.
【００７９】本実施例によるノズル部材９１は、前記第
８の実施例で述べたと同様に、ケーシング本体２の先端
側に装着され、断面積の異なる４個の噴射孔９２，９
３，９４，９５が形成されている。即ち、図３１に示す
如く、第１の噴射孔９２の出口部９２Ａは最大の短径寸
法ＤS1を有し、第２の噴射孔９３の出口部９３Ａは次に
大きい短径寸法ＤS2を有し、第３の噴射孔９４は中間の
短径寸法ＤS3を有し、さらに、第４の噴射孔９５の出口
部９５Ａは最小の短径寸法ＤS4を有し、各噴射孔９２，
９３，９４，９５は楕円形状に形成されている。また、
各噴射孔９２，９３，９４，９５の各噴射軸線Ｘ1，
Ｘ2，Ｘ3，Ｘ4は軸線Ｃとノズル部材９１の外部の点Ｐ
で交差している。The nozzle member 91 according to the present embodiment is mounted on the front end side of the casing main body 2 and has four injection holes 92, 9 having different cross-sectional areas, as in the case of the eighth embodiment.
3, 94, 95 are formed. That is, as shown in FIG. 31, the outlet portion 92A of the first injection hole 92 has the maximum minor diameter dimension D S1 , and the outlet portion 93A of the second injection hole 93 has the next largest minor diameter dimension D S2 . The third injection hole 94 has an intermediate minor diameter dimension D S3 , and the outlet portion 95A of the fourth injection hole 95 has a minimum minor diameter dimension D S4 .
93, 94 and 95 are formed in an elliptical shape. Also,
Each injection axis X 1 of each injection hole 92, 93, 94, 95,
X 2 , X 3 , and X 4 are the axis C and a point P outside the nozzle member 91.
Cross at.
【００８０】かくして、このように構成される本実施例
でも、上述した第８の実施例と同様の効果を得ることが
できる。これに加えて本実施例では、各噴射孔９２，９
３，９４，９５の断面形状を楕円形に形成したため、図
１０と共に詳述した第３の実施例と同様に、断面形状を
円形にした場合よりも微粒化を促進できると共に、燃料
噴射の指向性を得ることができる。Thus, in this embodiment having such a configuration, the same effect as that of the above-described eighth embodiment can be obtained. In addition to this, in this embodiment, the respective injection holes 92, 9
Since the cross-sectional shapes of 3, 94 and 95 are formed in an elliptical shape, atomization can be promoted and the direction of fuel injection can be improved as in the case of the third embodiment described in detail with reference to FIG. You can get sex.
【００８１】次に、図３２，図３３に基づき本発明の第
１１の実施例を説明する。本実施例の特徴は、図１６，
図１７と共に上述した第６の実施例と同様に、４個の噴
射孔の噴射軸線を燃料噴射弁の軸線Ｃを含む同一平面上
に位置させた点にある。Next, an eleventh embodiment of the present invention will be described with reference to FIGS. 32 and 33. The feature of this embodiment is that FIG.
Similar to the sixth embodiment described above with FIG. 17, the injection axes of the four injection holes are located on the same plane including the axis C of the fuel injection valve.
【００８２】本実施例によるノズル部材１０１は、第８
の実施例で述べたノズル部材８１と同様に、ケーシング
本体２の先端側に装着され、第１の噴射孔１０２と、第
２の噴射孔１０３と、第３の噴射孔１０４と、第４の噴
射孔１０５との合計４個の噴射孔が穿設されている。ま
た、これら各噴射孔１０２，１０３，１０４，１０５の
各出口部１０２Ａ，１０３Ａ，１０４Ａ，１０５Ａは、
各口径寸法Ｄ7，Ｄ8，Ｄ9，Ｄ10をもって形成されてい
る（Ｄ7＞Ｄ8＞Ｄ9＞Ｄ10）。The nozzle member 101 according to the present embodiment is the eighth
Like the nozzle member 81 described in the above embodiment, the first injection hole 102, the second injection hole 103, the third injection hole 104, and the fourth injection hole 102 are attached to the front end side of the casing body 2. A total of four injection holes including the injection hole 105 are provided. Further, the outlet portions 102A, 103A, 104A, 105A of the respective injection holes 102, 103, 104, 105 are
It is formed with each diameter dimension D 7 , D 8 , D 9 , D 10 (D 7 > D 8 > D 9 > D 10 ).
【００８３】ここで、第８の実施例とは異なり、各噴射
孔１０２，１０３，１０４，１０５は、その噴射軸線Ｘ
7，Ｘ8，Ｘ9，Ｘ10が軸線Ｃを含む同一平面上に位置す
るように形成されている。Here, unlike the eighth embodiment, each injection hole 102, 103, 104, 105 has its injection axis X.
7 , X 8 , X 9 , and X 10 are formed so as to be located on the same plane including the axis C.
【００８４】かくして、このように構成される本実施例
でも、第８の実施例と同様の効果を得ることができる。
また、これに加えて本実施例では、４個の噴射孔１０
２，１０３，１０４，１０５の噴射軸線Ｘ7，Ｘ8，
Ｘ9，Ｘ10を燃料噴射弁１の軸線Ｃを含む同一平面上に
位置させる構成としたため、第６の実施例で述べたと同
様に、偏平な噴霧パターンを得ることができる。Thus, also in this embodiment having the above-mentioned configuration, the same effect as that of the eighth embodiment can be obtained.
In addition to this, in this embodiment, four injection holes 10 are provided.
2, 103, 104, 105 injection axis lines X 7 , X 8 ,
Since X 9 and X 10 are arranged on the same plane including the axis C of the fuel injection valve 1, a flat spray pattern can be obtained as described in the sixth embodiment.
【００８５】なお、前記第１〜第７の実施例では、３個
の噴射孔として、「大中小」の噴射孔を例示したが、本
発明はこれに限定されず、「大大小」でも「大小小」で
もよく、最大径を有する噴射孔の断面積の平方根と最小
径を有する噴射孔の断面積の平方根との比が１．２以上
であればよい。In the first to seventh embodiments, the "large, medium and small" injection holes are illustrated as the three injection holes, but the present invention is not limited to this, and "large and small" can be used. It may be "large or small", and the ratio of the square root of the cross-sectional area of the injection hole having the maximum diameter to the square root of the cross-sectional area of the injection hole having the minimum diameter may be 1.2 or more.
【００８６】また、前記第８〜第１１の実施例では、
「４個以上の噴射孔」として、４個の噴射孔を例示した
が、本発明はこれに限らず、例えば５個、６個、７個、
８個等の４個以上の噴射孔を設けてもよい。この場合に
も、少なくとも一の噴射孔の断面積を他の噴射孔の断面
積と違えれば、微粒化を促進できる。従って、例えば５
個の噴射孔を設ける場合、４個の口径を同一にして残り
１個の口径のみを違えてもよく、あるいは５個全てを異
なる口径に設定してもよく、２個の口径をある値に揃
え、残り３個の口径を他の値に揃えてもよい。In the eighth to eleventh embodiments,
Although four injection holes are illustrated as the “four or more injection holes”, the present invention is not limited to this, and, for example, five, six, seven,
You may provide four or more injection holes, such as eight. Also in this case, atomization can be promoted if the cross-sectional area of at least one injection hole is different from that of the other injection holes. Therefore, for example, 5
When providing four injection holes, the four diameters may be the same and only the remaining one diameter may be different, or all five may be set to different diameters, and the two diameters may be set to a certain value. Alignment may be performed and the remaining three apertures may be aligned with other values.
【００８７】さらに、前記各実施例で述べた噴射孔の断
面形状、アシストエアの有無、軸線方向の断面変化等
は、前記各実施例に限られるものではなく、種々の組み
合わせが可能である。即ち、楕円形の噴射孔とアシスト
エアとを組み合わせたり、楕円形の噴射孔を同一平面上
に配置したりしてもよい。Furthermore, the cross-sectional shape of the injection hole, the presence or absence of assist air, the cross-sectional change in the axial direction, and the like described in each of the above embodiments are not limited to those in each of the above embodiments, and various combinations are possible. That is, the elliptical injection holes and assist air may be combined, or the elliptical injection holes may be arranged on the same plane.
【００８８】[0088]
【発明の効果】以上詳述した通り、本発明に係る燃料噴
射弁によれば、３個の噴射孔のうち少なくとも一の噴射
孔の断面積と他の噴射孔の断面積との平方根の比を１．
２以上に設定したため、各噴射孔からそれぞれ噴射され
た燃料が衝突するときに強い共振現象を発生させて微粒
化を促進することができ、設計の自由度を高めて使い勝
手を向上できる。As described in detail above, according to the fuel injection valve of the present invention, the ratio of the square root of the cross-sectional area of at least one of the three injection holes to the cross-sectional area of the other injection holes. 1.
Since the number is set to 2 or more, when the fuel injected from each injection hole collides, a strong resonance phenomenon can be generated to promote atomization, and the degree of freedom in design can be increased and usability can be improved.
【００８９】また、４個以上の噴射孔のうち少なくとも
一の噴射孔の断面積と他の噴射孔の断面積とを違える構
成としたため、各噴射孔から噴射された燃料が衝突する
ときに強い共振現象を発生させて一層微粒化を促進でき
ると共に、使い勝手を高めることができる。Further, since the cross-sectional area of at least one of the four or more injection holes is different from the cross-sectional area of the other injection holes, it is strong when the fuel injected from each injection hole collides. A resonance phenomenon can be generated to further promote atomization and enhance usability.
【００９０】さらに、前記各噴射孔の断面を非円形状に
形成したため、微粒化しつつ噴霧に指向性を持たせるこ
とができる。Further, since the cross section of each of the injection holes is formed in a non-circular shape, it is possible to give the spray directivity while atomizing.
【００９１】また、前記各噴射孔の噴射軸線を同一平面
上に位置させたため、偏平な噴霧パターンを得ることが
できる。Further, since the injection axis of each injection hole is located on the same plane, a flat spray pattern can be obtained.
【００９２】一方、前記各噴射孔から噴射された液体の
衝突部近傍に向けてアシストエアを供給する構成とした
ため、共振現象による微粒化と相乗効果を発揮し、一層
微粒化が促進する。On the other hand, since the assist air is supplied toward the vicinity of the collision portion of the liquid ejected from each of the ejection holes, it has a synergistic effect with atomization due to the resonance phenomenon and further promotes atomization.
【図１】本発明の第１の実施例に係る燃料噴射弁の要部
を図２中のＦ１−Ｆ１線に沿って示す断面図。FIG. 1 is a sectional view showing a main part of a fuel injection valve according to a first embodiment of the present invention, taken along line F1-F1 in FIG.
【図２】図１中のノズル部材を拡大して示す平面図。2 is an enlarged plan view showing a nozzle member in FIG. 1. FIG.
【図３】図２中のＦ３−Ｆ３線に沿った断面図。FIG. 3 is a cross-sectional view taken along line F3-F3 in FIG.
【図４】図２中のＦ４−Ｆ４線に沿った断面図。FIG. 4 is a cross-sectional view taken along line F4-F4 in FIG.
【図５】口径比と共振の強さとの関係を示す特性図。FIG. 5 is a characteristic diagram showing the relationship between the aperture ratio and the strength of resonance.
【図６】本発明の第２の実施例に係る燃料噴射弁の要部
を図７中のＦ６−Ｆ６線に沿って示す図１と同様の断面
図。FIG. 6 is a sectional view similar to FIG. 1, showing a main part of a fuel injection valve according to a second embodiment of the present invention, taken along line F6-F6 in FIG.
【図７】図６中のノズル部材を拡大して示す平面図。FIG. 7 is an enlarged plan view showing the nozzle member in FIG.
【図８】図７中のＦ８−Ｆ８線に沿った断面図。8 is a sectional view taken along line F8-F8 in FIG.
【図９】図７中のＦ９−Ｆ９線に沿った断面図。9 is a sectional view taken along line F9-F9 in FIG. 7.
【図１０】本発明の第３の実施例に係る燃料噴射弁のノ
ズル部材を示す平面図。FIG. 10 is a plan view showing a nozzle member of a fuel injection valve according to a third embodiment of the present invention.
【図１１】本発明の第４の実施例に係る燃料噴射弁の要
部を図１２中のＦ１１−Ｆ１１線に沿って示す断面図。FIG. 11 is a sectional view showing a main part of a fuel injection valve according to a fourth embodiment of the present invention, taken along line F11-F11 in FIG.
【図１２】図１１中のノズル部材を拡大して示す平面
図。12 is an enlarged plan view showing the nozzle member in FIG.
【図１３】図１１中のノズル部材等を拡大して示す断面
図。FIG. 13 is an enlarged sectional view showing a nozzle member and the like in FIG.
【図１４】本発明の第５の実施例に係る燃料噴射弁の要
部を図１５中のＦ１４−Ｆ１４線に沿って示す断面図。FIG. 14 is a cross-sectional view showing the main parts of a fuel injection valve according to a fifth embodiment of the present invention, taken along line F14-F14 in FIG.
【図１５】図１４中のノズル部材を拡大して示す平面
図。FIG. 15 is an enlarged plan view showing the nozzle member in FIG.
【図１６】本発明の第６の実施例に係る燃料噴射弁の要
部を図１７中のＦ１６−Ｆ１６線に沿って示す断面図。16 is a cross-sectional view showing the main parts of a fuel injection valve according to a sixth embodiment of the present invention, taken along line F16-F16 in FIG.
【図１７】図１６中のノズル部材を拡大して示す平面
図。FIG. 17 is an enlarged plan view showing the nozzle member in FIG.
【図１８】本発明の第７の実施例に係る燃料噴射弁の要
部を示す断面図。FIG. 18 is a sectional view showing a main part of a fuel injection valve according to a seventh embodiment of the present invention.
【図１９】各噴射孔側からみた平面図。FIG. 19 is a plan view seen from each injection hole side.
【図２０】図１８中のＦ２０−Ｆ２０線に沿った断面
図。20 is a cross-sectional view taken along line F20-F20 in FIG.
【図２１】本発明の第８の実施例に係る燃料噴射弁の要
部を図２２中のＦ２１−Ｆ２１線に沿って示す断面図。FIG. 21 is a sectional view showing a main part of a fuel injection valve according to an eighth embodiment of the present invention, taken along line F21-F21 in FIG.
【図２２】図２１中のノズル部材の平面図。22 is a plan view of the nozzle member in FIG.
【図２３】ノズル部材等を拡大して示す断面図。FIG. 23 is an enlarged sectional view showing a nozzle member and the like.
【図２４】ノズル部材等を図２２中のＦ２４−Ｆ２４線
に沿って示す拡大断面図。24 is an enlarged cross-sectional view showing the nozzle member and the like along line F24-F24 in FIG. 22.
【図２５】４個以上の噴射孔を有する場合における口径
比と共振の強さとの関係を示す特性図。FIG. 25 is a characteristic diagram showing the relationship between the aperture ratio and the resonance strength in the case of having four or more injection holes.
【図２６】本発明の第９の実施例に係る燃料噴射弁の要
部を図２７中のＦ２６−Ｆ２６線に沿って示す断面図。FIG. 26 is a sectional view showing a main part of a fuel injection valve according to a ninth embodiment of the present invention, taken along line F26-F26 in FIG. 27.
【図２７】図２６中のノズル部材を拡大して示す平面
図。FIG. 27 is an enlarged plan view showing the nozzle member in FIG. 26.
【図２８】ノズル部材等を拡大して示す断面図。FIG. 28 is an enlarged sectional view showing a nozzle member and the like.
【図２９】ノズル部材等を図２７中のＦ２９−Ｆ２９線
に沿って示す拡大断面図。FIG. 29 is an enlarged cross-sectional view showing the nozzle member and the like along line F29-F29 in FIG. 27.
【図３０】本発明の第１０の実施例に係る燃料噴射弁の
要部を図３１中のＦ３０−Ｆ３０線に沿って示す断面
図。FIG. 30 is a sectional view showing a main part of a fuel injection valve according to a tenth embodiment of the present invention, taken along line F30-F30 in FIG.
【図３１】図３０中のノズル部材を拡大して示す平面
図。31 is an enlarged plan view showing the nozzle member in FIG. 30. FIG.
【図３２】本発明の第１１の実施例に係る燃料噴射弁の
要部を図３３中のＦ３２−Ｆ３２線に沿って示す断面
図。32 is a cross-sectional view showing the main parts of a fuel injection valve according to an eleventh embodiment of the present invention, taken along line F32-F32 in FIG.
【図３３】図３２中のノズル部材を拡大して示す平面
図。FIG. 33 is an enlarged plan view showing the nozzle member in FIG. 32.
【図３４】従来技術による燃料噴射弁のノズル部材等を
拡大して示す断面図。FIG. 34 is an enlarged sectional view showing a nozzle member and the like of a fuel injection valve according to a conventional technique.
【図３５】本出願人が先に提案した先行技術に係る燃料
噴射弁の要部を示す断面図。FIG. 35 is a cross-sectional view showing a main part of a fuel injection valve according to a prior art previously proposed by the applicant.
【図３６】図３５中のノズル部材等を拡大して示す断面
図。36 is a cross-sectional view showing an enlarged nozzle member and the like in FIG. 35.
【図３７】ノズル部材を拡大して示す平面図。FIG. 37 is an enlarged plan view showing a nozzle member.
１…燃料噴射弁 ２，７１Ａ…ケーシング本体 ６，７６…弁体 １２，１３，１４，３２，３３，３４，４２，４３，４
４，５２，５３，５４，６２，６３，６４，７２，７
３，７４，８２，８３，８４，８５，９２，９３，９
４，９５，１０２，１０３，１０４，１０５…噴射孔 ２２…エア噴射孔DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve 2,71A ... Casing main body 6,76 ... Valve body 12,13,14,32,33,34,42,43,4
4, 52, 53, 54, 62, 63, 64, 72, 7
3,74,82,83,84,85,92,93,9
4, 95, 102, 103, 104, 105 ... Injection hole 22 ... Air injection hole
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｍ 61/18 ３６０ Ｊ 69/00 ３１０ Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location F02M 61/18 360 J 69/00 310 Z
Claims (5)
と、このケーシングの一端側に前記燃料流路にそれぞれ
連通して設けられた３個の噴射孔と、ケーシング内に軸
方向に移動可能に設けられ、これら３個の噴射孔を開閉
する弁体とを備えた燃料噴射弁であって、 前記３個の噴射孔からそれぞれ噴射された燃料が互いに
衝突するように該各噴射孔の噴射軸線を設定するととも
に、 少なくとも一の噴射孔の断面積と他の噴射孔の断面積と
の平方根の比が１．２以上となるように設定したことを
特徴とする燃料噴射弁。1. A casing having a fuel flow passage therein, three injection holes provided at one end of the casing so as to respectively communicate with the fuel flow passage, and axially movable in the casing. And a valve element that opens and closes these three injection holes, the injection of each injection hole such that the fuels injected from the three injection holes collide with each other. A fuel injection valve characterized by setting an axis and setting a ratio of a square root of a cross-sectional area of at least one injection hole and a cross-sectional area of another injection hole to 1.2 or more.
と、このケーシングの一端側に前記燃料流路にそれぞれ
連通して設けられた４個以上の噴射孔と、ケーシング内
に軸方向に移動可能に設けられ、これら４個以上の噴射
孔を開閉する弁体とを備えた燃料噴射弁であって、 前記４個以上の噴射孔からそれぞれ噴射された燃料が互
いに衝突するように該各噴射孔の噴射軸線を設定すると
ともに、 少なくとも一の噴射孔の断面積を他の噴射孔の断面積と
違えたことを特徴とする燃料噴射弁。2. A casing having a fuel flow passage therein, four or more injection holes provided at one end of the casing so as to communicate with the fuel flow passage, and moved axially in the casing. A fuel injection valve, which is provided so as to be capable of opening and closing these four or more injection holes, wherein each fuel is injected so as to collide with the fuel injected from each of the four or more injection holes. A fuel injection valve, characterized in that the injection axis of a hole is set and the cross-sectional area of at least one injection hole is different from the cross-sectional area of another injection hole.
たことを特徴とする請求項１または請求項２に記載の燃
料噴射弁。3. The fuel injection valve according to claim 1, wherein a cross section of each of the injection holes is formed in a non-circular shape.
位置させたことを特徴とする請求項１〜３のいずれかに
記載の燃料噴射弁。4. The fuel injection valve according to claim 1, wherein the injection axis of each of the injection holes is located on the same plane.
部近傍に向けてアシストエアを供給する構成としたこと
を特徴とする請求項１〜３のいずれかに記載の燃料噴射
弁。5. The fuel injection valve according to claim 1, wherein assist air is supplied toward the vicinity of a collision portion of the fuel injected from each of the injection holes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06171498A JP3132296B2 (en) | 1994-07-25 | 1994-07-25 | Fuel injection valve |
| US08/365,639 US5540200A (en) | 1993-12-28 | 1994-12-28 | Fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06171498A JP3132296B2 (en) | 1994-07-25 | 1994-07-25 | Fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0835463A true JPH0835463A (en) | 1996-02-06 |
| JP3132296B2 JP3132296B2 (en) | 2001-02-05 |
Family
ID=15924220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06171498A Expired - Fee Related JP3132296B2 (en) | 1993-12-28 | 1994-07-25 | Fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3132296B2 (en) |
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| FR2846054A1 (en) * | 2002-10-16 | 2004-04-23 | Mitsubishi Electric Corp | Fuel injection valve for internal combustion engine has valve seat with decreasing inner peripheral surface diameter towards downstream side, and nozzle plate with holes of different lengths of radial outside and inside at shaft center |
| KR100764524B1 (en) * | 2000-07-04 | 2007-10-09 | 로베르트 보쉬 게엠베하 | Fuel injection system |
| JP2008121517A (en) * | 2006-11-10 | 2008-05-29 | Toyota Motor Corp | Fuel injection valve of internal combustion engine |
| JP2009091998A (en) * | 2007-10-10 | 2009-04-30 | Nikki Co Ltd | Injector |
| JP5627743B1 (en) * | 2013-07-05 | 2014-11-19 | 三菱電機株式会社 | Fluid injection valve and spray generating device |
| JP5627742B1 (en) * | 2013-07-04 | 2014-11-19 | 三菱電機株式会社 | Fluid injection valve and spray generating device |
| WO2015011539A1 (en) * | 2013-07-25 | 2015-01-29 | Toyota Jidosha Kabushiki Kaisha | Fuel injection valve |
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| JP2008121517A (en) * | 2006-11-10 | 2008-05-29 | Toyota Motor Corp | Fuel injection valve of internal combustion engine |
| JP2009091998A (en) * | 2007-10-10 | 2009-04-30 | Nikki Co Ltd | Injector |
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| JP2015025406A (en) * | 2013-07-25 | 2015-02-05 | 株式会社デンソー | Fuel injection valve |
| KR20180037144A (en) * | 2015-05-29 | 2018-04-11 | 노스트럼 에너지 피티이. 리미티드 | Fluid injector orifice plate for impact jet |
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| WO2023135834A1 (en) * | 2022-01-11 | 2023-07-20 | 株式会社サイエンス | Mist generation nozzle |
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| JP3132296B2 (en) | 2001-02-05 |
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