JP5987754B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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JP5987754B2
JP5987754B2 JP2013076066A JP2013076066A JP5987754B2 JP 5987754 B2 JP5987754 B2 JP 5987754B2 JP 2013076066 A JP2013076066 A JP 2013076066A JP 2013076066 A JP2013076066 A JP 2013076066A JP 5987754 B2 JP5987754 B2 JP 5987754B2
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opening end
axis
fuel
valve
nozzle hole
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JP2014202078A (en
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夏樹 杉山
夏樹 杉山
ベノワ オリビエ
ベノワ オリビエ
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Toyota Motor Corp
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Description

本発明は、燃料噴射弁に関する。   The present invention relates to a fuel injection valve.

従来、弁孔を有するバルブボディ（以下、弁ボディと呼称する）と、弁孔を開閉するよう弁ボディの内部に設けたニードル（以下、弁体と呼称する）と、弁ボディの外部から弁孔を覆う噴孔プレートとを備え、噴孔プレートに、プレート厚み方向に貫通する噴孔を形成した燃料噴射弁が知られている（例えば、特許文献１参照）。   Conventionally, a valve body having a valve hole (hereinafter referred to as a valve body), a needle (hereinafter referred to as a valve body) provided inside the valve body so as to open and close the valve hole, and a valve from the outside of the valve body 2. Description of the Related Art There is known a fuel injection valve that includes an injection hole plate that covers a hole, and has an injection hole that penetrates in the thickness direction of the injection hole plate (see, for example, Patent Document 1).

噴孔は、弁ボディ側に位置する開口端部（入側開口端部）から弁ボディの反対側に位置する開口端部（出側開口端部）へ向けて流路断面積が大きくなるよう形成されている。   The nozzle hole has a channel cross-sectional area that increases from an opening end (inlet opening end) located on the valve body side to an opening end (exit opening end) located on the opposite side of the valve body. Is formed.

また、噴孔は、噴孔プレートに対する平面視において、入側開口端部の中心よりも出側開口端部の中心のほうが、噴孔プレートの外縁部側に位置するよう形成されている。   In addition, the injection hole is formed such that the center of the exit opening end is located closer to the outer edge of the injection hole plate than the center of the entrance opening end in a plan view with respect to the injection hole plate.

特開２００２−２２１１２８号公報JP 2002-221128 A

しかしながら、噴孔の流路断面形状を、入側開口端部から出側開口端部へ向けて流路断面積が大きくなるよう形成することにより、噴孔から外部に噴霧される燃料液滴の微粒化を図ったとしても、複数の噴孔のそれぞれから噴射される燃料の噴霧範囲が干渉すると、燃料液滴の微粒化が促進されにくくなるという課題があった。   However, by forming the channel cross-sectional shape of the nozzle hole so that the channel cross-sectional area increases from the inlet opening end to the outlet opening end, the fuel droplets sprayed from the nozzle hole to the outside Even when atomization is attempted, there is a problem that atomization of fuel droplets is difficult to be promoted if the spray range of fuel injected from each of the plurality of nozzle holes interferes.

そこで、本発明は、上述したような従来の問題を解決するためになされたもので、従来のものと比較して、複数の噴孔から外部へ噴射される燃料液滴の微粒化を促進し得る燃料噴射弁を提供することを目的としている。   Therefore, the present invention has been made to solve the conventional problems as described above, and promotes atomization of fuel droplets injected from a plurality of nozzle holes to the outside as compared with the conventional one. The object is to provide a fuel injection valve.

本発明に係る燃料噴射弁は、上記目的を解決するため、（１）弁孔を有する弁ボディと、前記弁孔を開閉するよう前記弁ボディの内部に設けた弁体と、前記弁孔を覆うよう弁ボディに設けた噴孔プレートとを備え、前記噴孔プレートに、プレート厚み方向に貫通する噴孔を複数形成した燃料噴射弁であって、前記噴孔は、入側開口端部と出側開口端部とを有し、前記噴孔の流路断面は、前記噴孔プレートに対する平面視において、互いに交差した第１の軸および第２の軸を有するオーバル状に形成され、前記入側開口端部に属する前記第１の軸と前記出側開口端部に属する前記第１の軸とが平行であり、前記入側開口端部に属する前記第２の軸と前記出側開口端部に属する前記第２の軸とが平行であり、前記噴孔の入側開口端部に属する第１の軸が長軸で、かつ前記入側開口端部に属する第２の軸が短軸であり、前記噴孔の出側開口端部に属する第１の軸が短軸で、かつ前記出側開口端部に属する第２の軸が長軸であり、前記出側開口端部において前記第１の軸と前記第２の軸との交点である前記出側開口部の中心は、前記入側開口端部において前記第１の軸と前記第２の軸との交点である前記入側開口端部の中心よりも前記噴孔プレートの外縁付側に位置するように形成され、前記出側開口端部の中心と前記入側開口端部の中心とを結ぶ線である前記噴孔の軸線の向きは、前記噴孔のそれぞれから噴射される燃料の噴霧範囲において互いに隣接する外縁部分が燃料噴射方向に平行に並ぶよう設定された構成となっている。 In order to solve the above-described object, the fuel injection valve according to the present invention includes (1) a valve body having a valve hole, a valve body provided inside the valve body so as to open and close the valve hole, and the valve hole. and a nozzle hole plate provided in the valve body so as to cover, in the injection hole plate, a fuel injection valve in which a plurality form nozzle holes which penetrate in the plate thickness direction, the injection hole, and the entry side opening end and an exit-side opening end portion, the flow path cross-section of said injection hole, in a plan view with respect to the injection hole plate is formed in an oval shape having a first and second axes that intersect each other, the entering The first axis belonging to the side opening end and the first axis belonging to the exit opening end are parallel to each other, and the second axis belonging to the entry opening end and the exit opening end The first axis belonging to the inlet opening end of the nozzle hole is parallel to the second axis belonging to the nozzle The axis is a major axis, the second axis belonging to the inlet opening end is a minor axis, the first axis belonging to the outlet opening end of the nozzle hole is a minor axis, and the outlet opening The second axis belonging to the end is a long axis, and the center of the exit opening that is the intersection of the first axis and the second axis at the exit opening end is the entrance opening. The exit side open end is formed so as to be located on the outer edge side of the nozzle hole plate with respect to the center of the entrance side open end that is the intersection of the first axis and the second axis at the end. The direction of the axis of the nozzle hole, which is a line connecting the center of the inlet and the center of the inlet opening end, is such that the outer edge portions adjacent to each other in the spray range of fuel injected from each of the nozzle holes are in the fuel injection direction The configuration is set so as to be arranged in parallel with each other.

この構成により、本発明の燃料噴射弁は、噴孔のそれぞれから噴射される燃料の噴霧範囲において互いに隣接する外縁部分が燃料噴射方向に平行に並ぶよう、噴孔の軸線の向きを設定しているため、複数の噴孔のそれぞれから噴射される燃料の噴霧範囲が干渉せず、燃料液滴の微粒化を促進し得る。   With this configuration, the fuel injection valve of the present invention sets the direction of the axis of the nozzle hole so that the outer edge portions adjacent to each other are aligned in parallel to the fuel injection direction in the spray range of the fuel injected from each of the nozzle holes. Therefore, the spray range of the fuel injected from each of the plurality of nozzle holes does not interfere, and atomization of the fuel droplets can be promoted.

なお、上記（１）に記載の燃料噴射弁において、（２）前記噴孔の流路断面は、前記弁ボディ側に位置する入側開口端部から前記弁ボディの反対側に位置する出側開口端部へ向けて流路断面積が大きくなるようテーパ状に形成された構成としてもよい。   In the fuel injection valve described in (1) above, (2) the flow passage cross section of the nozzle hole is located on the opposite side of the valve body from the inlet opening end located on the valve body side. It is good also as a structure formed in the taper shape so that a flow-path cross-sectional area may become large toward an opening edge part.

この構成により、本発明の燃料噴射弁は、噴孔から外部に噴射される燃料について、燃料が拡散する範囲を拡げられる。   With this configuration, the fuel injection valve of the present invention can expand the range in which the fuel diffuses with respect to the fuel that is injected from the nozzle hole to the outside.

また、上記（１）または（２）に記載の燃料噴射弁において、（３）前記噴孔は、前記入側開口端部および前記出側開口端部の第１の軸に沿った断面において相対する内壁面部がなす第１の角度よりも、前記入側開口端部および前記出側開口端部の第２の軸に沿った断面において相対する内壁面部がなす第２の角度のほうが大きくなるよう形成された構成としてもよい。   Further, in the fuel injection valve according to the above (1) or (2), (3) the nozzle hole is relatively in a cross section along the first axis of the inlet side opening end and the outlet side opening end. The second angle formed by the opposed inner wall surface portions in the section along the second axis of the inlet side opening end portion and the outlet side opening end portion is larger than the first angle formed by the inner wall surface portion to be formed. It is good also as a formed structure.

この構成により、本発明の燃料噴射弁は、入側開口端部および出側開口端部の第１の軸に沿った断面において相対する内壁面部がなす第１の角度よりも、入側開口端部および出側開口端部の第２の軸に沿った断面において相対する内壁面部がなす第２の角度のほうが大きくなるよう形成しているため、噴孔から外部へ噴射される燃料が、出側開口端部の第２の軸方向に拡がるとともに、弁ボディの外部から空気が、燃料の噴射に呼応して噴孔の内部へと巻き込まれる。   With this configuration, the fuel injection valve of the present invention has an inlet opening end that is more than the first angle formed by the opposed inner wall surfaces in the section along the first axis of the inlet opening end and the outlet opening end. Since the second angle formed by the opposed inner wall surfaces in the cross section along the second axis of the portion and the outlet opening end is larger, the fuel injected from the nozzle hole to the outside is discharged. While expanding in the second axial direction of the side opening end, air is drawn from the outside of the valve body into the inside of the injection hole in response to fuel injection.

よって、本発明の燃料噴射弁は、噴孔から外部へ噴射される燃料について、出側開口端部の第１の軸方向の燃料液膜の厚さを薄くするとともに、燃料液膜を出側開口端部の第２の軸方向に十分に拡げて、燃料液滴の微粒化を効果的に促進し得る。   Therefore, the fuel injection valve of the present invention reduces the thickness of the fuel liquid film in the first axial direction of the outlet opening end portion of the fuel injected from the nozzle hole to the outside, and removes the fuel liquid film from the outlet side. It can expand sufficiently in the second axial direction of the opening end, and can effectively promote atomization of fuel droplets.

また、上記（１）ないし（３）に記載の燃料噴射弁において、（４）前記噴孔の前記出側開口端部の中心は、前記噴孔プレートに対する平面視において、前記噴孔の前記入側開口端部の第１の軸および第２の軸のいずれにも重ならないよう設定された構成としてもよい。   In the fuel injection valve according to (1) to (3) above, (4) the center of the outlet opening end of the nozzle hole is the entrance of the nozzle hole in a plan view with respect to the nozzle hole plate. It is good also as a structure set so that it may not overlap with any of the 1st axis | shaft of a side opening edge part, and a 2nd axis | shaft.

この構成より、本発明の燃料噴射弁は、噴孔の前記出側開口端部の中心を、噴孔プレートに対する平面視において、噴孔の入側開口端部の第１の軸および第２の軸のいずれにも重ならないよう設定しているため、微粒化された燃料を噴孔の軸線を中心に非対称な範囲に噴霧する。   With this configuration, the fuel injection valve of the present invention has the center of the outlet opening end of the nozzle hole in the plan view with respect to the nozzle hole plate, the first axis and the second axis of the inlet opening end of the nozzle hole. Since it is set so as not to overlap any of the shafts, the atomized fuel is sprayed in an asymmetrical range around the axis of the nozzle hole.

よって、本発明の燃料噴射弁は、複数の噴孔のそれぞれから噴射される燃料の噴霧範囲が干渉せず、燃料液滴の微粒化を効果的に促進し得る。   Therefore, in the fuel injection valve of the present invention, the spray range of the fuel injected from each of the plurality of injection holes does not interfere and can effectively promote atomization of the fuel droplets.

本発明によれば、従来のものと比較して、複数の噴孔から外部へ噴射される燃料液滴の微粒化を促進し得る燃料噴射弁を提供することができる。   According to the present invention, it is possible to provide a fuel injection valve that can promote atomization of fuel droplets injected from a plurality of nozzle holes to the outside as compared with the conventional one.

本発明の第１の実施の形態に係る燃料噴射弁の構造を示す模式図であり、図１（ａ）は燃料噴射弁の先端部の断面図、図１（ｂ）は図１（ａ）のＢ１方向視図、図１（ｃ）は図１（ａ）のＣ１方向視図、図１（ｄ）は図１（ｃ）のＤ１−Ｄ１断面図である。It is a schematic diagram which shows the structure of the fuel injection valve which concerns on the 1st Embodiment of this invention, Fig.1 (a) is sectional drawing of the front-end | tip part of a fuel injection valve, FIG.1 (b) is FIG.1 (a). FIG. 1C is a C1 direction view of FIG. 1A, and FIG. 1D is a D1-D1 cross-sectional view of FIG. 1C. 本発明の第１の実施の形態に係る燃料噴射弁の作用を示す模式図である。It is a schematic diagram which shows the effect | action of the fuel injection valve which concerns on the 1st Embodiment of this invention. 本発明の第１の実施の形態に係る燃料噴射弁における燃料の噴霧範囲を示す模式図であり、図３（ａ）は噴孔プレートの側面視図、図３（ｂ）は噴孔プレートの底面視図、図３（ｃ）は燃料粒径の分布を表すグラフである。It is a schematic diagram which shows the spray range of the fuel in the fuel injection valve which concerns on the 1st Embodiment of this invention, Fig.3 (a) is a side view of an injection hole plate, FIG.3 (b) is an injection hole plate. A bottom view and FIG. 3C are graphs showing the fuel particle size distribution. 本発明の第２の実施の形態に係る燃料噴射弁の構造を示す模式図であり、図４（ａ）は燃料噴射弁の先端部の縦断面図、図４（ｂ）は図４（ａ）のＢ２方向視図、図４（ｃ）は図４（ａ）のＣ２方向視図、図４（ｄ）は図４（ｃ）のＤ２−Ｄ２断面図である。It is a schematic diagram which shows the structure of the fuel injection valve which concerns on the 2nd Embodiment of this invention, Fig.4 (a) is a longitudinal cross-sectional view of the front-end | tip part of a fuel injection valve, FIG.4 (b) is FIG.4 (a). 4B is a view in the B2 direction, FIG. 4C is a view in the C2 direction in FIG. 4A, and FIG. 4D is a cross-sectional view along D2-D2 in FIG. 本発明の第２の実施の形態に係る燃料噴射弁における燃料の噴霧範囲を示す模式図であり、図５（ａ）は噴孔プレートの側面視図、図５（ｂ）は噴孔プレートの底面視図、図５（ｃ）は燃料粒径の分布を表すグラフである。It is a schematic diagram which shows the spraying range of the fuel in the fuel injection valve which concerns on the 2nd Embodiment of this invention, Fig.5 (a) is a side view of an injection hole plate, FIG.5 (b) is an injection hole plate. A bottom view and FIG. 5C are graphs showing the fuel particle size distribution.

以下、本発明に係る燃料噴射弁の実施の形態について、図面を用いて説明する。   Hereinafter, embodiments of a fuel injection valve according to the present invention will be described with reference to the drawings.

（第１の実施形態）
第１の実施の形態に係る燃料噴射弁１は、図１（ａ）、図２に示すように、弁ボディ１０、弁体２０および噴孔プレート３０を備え、噴孔プレート３０に、プレート厚み方向に貫通する噴孔３１を複数形成している。 (First embodiment)
As shown in FIGS. 1A and 2, the fuel injection valve 1 according to the first embodiment includes a valve body 10, a valve body 20, and an injection hole plate 30, and the injection hole plate 30 has a plate thickness. A plurality of nozzle holes 31 penetrating in the direction are formed.

弁ボディ１０は、中空構造体であり、上下に延びる燃料供給通路１１と、燃料供給通路１１の下端部に連通して下向きに開口する弁孔１２を有している。燃料供給通路１１には、図示していないポンプにより加圧された燃料が送給されるようになっている。弁孔１２の内周面部は、下方に向けて内径がテーパ状に縮小するよう形成され、弁座１３となっている。   The valve body 10 is a hollow structure, and has a fuel supply passage 11 extending vertically and a valve hole 12 that communicates with a lower end portion of the fuel supply passage 11 and opens downward. A fuel pressurized by a pump (not shown) is supplied to the fuel supply passage 11. The inner peripheral surface portion of the valve hole 12 is formed so that the inner diameter thereof decreases in a tapered shape toward the lower side, and serves as a valve seat 13.

弁体２０は、上下方向に延びる棒状体であり、弁ボディ１０の内部に同軸に配置されている。弁体２０の下端部は、下方に向けて外径がテーパ状に縮小するよう形成されている。このテーパ部分の最も外径が大きい個所の全周がシール部２１として、弁ボディ１０の弁座１３に接するようになっている。   The valve body 20 is a rod-like body extending in the vertical direction, and is disposed coaxially inside the valve body 10. The lower end portion of the valve body 20 is formed so that the outer diameter decreases in a tapered shape downward. The entire circumference of the tapered portion having the largest outer diameter is in contact with the valve seat 13 of the valve body 10 as a seal portion 21.

弁体２０は、図示していないスプリングおよびソレノイドコイル等で構成される弁駆動装置により上下方向へ移動し、弁ボディ１０の弁孔１２を開閉するようになっている。   The valve body 20 is moved in the vertical direction by a valve driving device including a spring and a solenoid coil (not shown) to open and close the valve hole 12 of the valve body 10.

スプリングは、弁体２０を弁ボディ１０に対して下向きに押圧する役割を担っている。すなわち、弁体２０は、ソレノイドコイルが励磁されていないと、スプリングの復元力により下方へ向けて押圧され、シール部２１が弁ボディ１０の弁座１３に接した状態となるため、燃料供給通路１１と弁孔１２との連通を遮断されることになる。   The spring plays a role of pressing the valve body 20 downward against the valve body 10. That is, when the solenoid coil is not excited, the valve body 20 is pressed downward by the restoring force of the spring, and the seal portion 21 is in contact with the valve seat 13 of the valve body 10. Communication between the valve 11 and the valve hole 12 is cut off.

ソレノイドコイルは、スプリングの復元力に抗して弁体２０を引き上げる役割を担っている。すなわち、弁体２０は、ソレノイドコイルが励磁されると、磁気吸引力により引き上げられ、シール部２１が弁ボディ１０の弁座１３から離れた状態となるため、燃料供給通路１１と弁孔１２とが連通することになる。   The solenoid coil plays a role of pulling up the valve body 20 against the restoring force of the spring. That is, when the solenoid coil is excited, the valve body 20 is pulled up by the magnetic attractive force, and the seal portion 21 is separated from the valve seat 13 of the valve body 10, so that the fuel supply passage 11 and the valve hole 12 Will communicate.

噴孔プレート３０は、弁孔１２を覆うよう弁ボディ１０の下端部に溶接等によって取り付けられている。   The nozzle hole plate 30 is attached to the lower end portion of the valve body 10 by welding or the like so as to cover the valve hole 12.

噴孔３１は、図１（ｂ）に示す噴孔プレート３０に対する平面視において、流路断面が第１の軸Ｘ１，Ｘ２および第２の軸Ｙ１，Ｙ２を有するオーバル状に形成されている。   The nozzle hole 31 is formed in an oval shape in which the cross section of the flow path has first axes X1 and X2 and second axes Y1 and Y2 in a plan view with respect to the nozzle hole plate 30 shown in FIG.

図１（ｂ）および図１（ｃ）では、第１の軸Ｘ１，Ｘ２が長軸であり、第２の軸Ｙ１，Ｙ２が短軸である。そして、第１の軸Ｘ１および第２の軸Ｙ１は、噴孔３１において、弁ボディ１０側（図中上側）に位置する入側開口端部３１ａに属し、第１の軸Ｘ２および第２の軸Ｙ２は、噴孔３１において、弁ボディ１０の反対側（図中の下側）に位置する出側開口端部３１ｂに属している。   In FIG. 1B and FIG. 1C, the first axes X1 and X2 are major axes, and the second axes Y1 and Y2 are minor axes. The first axis X1 and the second axis Y1 belong to the inlet side opening end portion 31a located on the valve body 10 side (upper side in the drawing) in the injection hole 31, and the first axis X2 and the second axis Y1 The axis Y2 belongs to the outlet opening end 31b located on the opposite side (lower side in the drawing) of the valve body 10 in the nozzle hole 31.

なお、以下説明する各実施の形態において、オーバル状とは、楕円形、卵形、長円形等のような、少なくとも１つの軸に線対称な閉じた曲線に限定されるものではなく、線対称ではない閉じた曲線も含むものとする。   In each of the embodiments described below, the oval shape is not limited to a closed curve that is axisymmetric about at least one axis, such as an ellipse, an oval, an oval, etc. It also includes closed curves that are not.

噴孔３１は、入側開口端部３１ａから出側開口端部３１ｂへ向けて流路断面積が大きくなるようテーパ状に形成されている。噴孔３１は、入側開口端部３１ａの中心（第１の軸Ｘ１と第２の軸Ｙ１との交点）よりも出側開口端部３１ｂの中心（第１の軸Ｘ２と第２の軸Ｙ２との交点）のほうが、噴孔プレート３０の外縁部側に位置するよう形成されている。   The nozzle hole 31 is formed in a tapered shape so that the cross-sectional area of the flow path increases from the inlet opening end 31a to the outlet opening end 31b. The nozzle hole 31 has a center (first axis X2 and second axis) of the outlet side opening end portion 31b rather than the center of the inlet side opening end portion 31a (intersection of the first axis X1 and the second axis Y1). (The intersection with Y2) is formed so as to be located on the outer edge side of the nozzle hole plate 30.

噴孔３１は、入側開口端部３１ａおよび出側開口端部３１ｂの第１の軸Ｘ１，Ｘ２に沿った縦断面（図１（ａ）参照）において、相対する内壁面部３１ｃ，３１ｄがなす第１の角度θ１に比べて、入側開口端部３１ａおよび出側開口端部３１ｂの第２の軸Ｙ１，Ｙ２に沿った斜断面（図１（ｃ）および図１（ｄ）参照）において、相対する内壁面部３１ｅ，３１ｆがなす第２の角度θ２が大きくなるよう形成されている。なお、図中、Ｚは、噴孔３１の軸線を表している。   The nozzle hole 31 is formed by opposed inner wall surface portions 31c and 31d in a longitudinal section (see FIG. 1A) along the first axes X1 and X2 of the inlet side opening end portion 31a and the outlet side opening end portion 31b. Compared to the first angle θ1, in an oblique cross section (see FIGS. 1C and 1D) along the second axes Y1 and Y2 of the inlet side opening end portion 31a and the outlet side opening end portion 31b. The second angle θ2 formed by the opposing inner wall surface portions 31e and 31f is formed to be large. In the figure, Z represents the axis of the nozzle hole 31.

噴孔３１の軸線Ｚの向きは、図３（ａ）および図３（ｂ）に示すように、噴孔プレート３０の外部に向けて噴射される燃料の噴霧範囲Ｐの外縁において最も近接する部分が互いに平行に並ぶよう設定されている。   The direction of the axis Z of the injection hole 31 is the closest part at the outer edge of the spray range P of the fuel injected toward the outside of the injection hole plate 30, as shown in FIGS. 3 (a) and 3 (b). Are arranged in parallel to each other.

次に、本実施の形態に係る燃料噴射弁１の作用を図２、図３を用いて説明する。なお、図２において、Ｆは燃料の流れ、Ａは空気の流れ、Ｌｆ１，Ｌｆ２，Ｌｆ３，Ｌｆ４は燃料液膜断面、Ｌｇは燃料液滴、ｈは燃料液膜の厚さを表している。   Next, the operation of the fuel injection valve 1 according to the present embodiment will be described with reference to FIGS. In FIG. 2, F represents the flow of fuel, A represents the flow of air, Lf1, Lf2, Lf3, and Lf4 represent fuel liquid film cross sections, Lg represents fuel droplets, and h represents the thickness of the fuel liquid film.

燃料噴射弁１は、弁ボディ１０の燃料供給通路１１に、図示していないポンプから燃料が送給されている状態で燃料噴射を行う。燃料噴射弁１は、図示していない弁駆動装置によって弁体２０が引き上げられると、燃料供給通路１１の燃料を、弁座１３と弁体２０の下端部の外周面部との間隙、および弁孔１２を経て噴孔３１に流入させ、噴孔３１の出側開口端部３１ｂから外部下方へ噴射する。   The fuel injection valve 1 performs fuel injection in a state where fuel is supplied to a fuel supply passage 11 of the valve body 10 from a pump (not shown). When the valve body 20 is pulled up by a valve driving device (not shown), the fuel injection valve 1 causes the fuel in the fuel supply passage 11 to pass through the gap between the valve seat 13 and the outer peripheral surface portion of the lower end portion of the valve body 20, and the valve hole. 12 is caused to flow into the nozzle hole 31 and sprayed downward from the outlet side opening end 31b of the nozzle hole 31 to the outside.

これにより、燃料供給通路１１の燃料は、弁座１３と弁体２０の下端部の外周面部との間隙、および弁孔１２を経て噴孔３１に流入し、噴孔３１から燃料噴射弁１の下方に噴射される。   As a result, the fuel in the fuel supply passage 11 flows into the injection hole 31 through the gap between the valve seat 13 and the outer peripheral surface portion of the lower end portion of the valve body 20 and the valve hole 12, and from the injection hole 31 to the fuel injection valve 1. Injected downward.

燃料噴射弁１は、燃料供給通路１１から噴孔３１へと向かう燃料について、弁座１３、弁体２０および噴孔プレート３０により圧力損失を与えて燃料の流れＦに乱れを生じさせ、また、入側開口端部３１ａから噴孔３１に流入する際に、噴孔３１の内壁面部３１ｃに密になるように流入させ、境界層剥離を生じさせる。   The fuel injection valve 1 causes a loss of pressure by the valve seat 13, the valve body 20 and the injection hole plate 30 with respect to the fuel traveling from the fuel supply passage 11 to the injection hole 31, thereby causing a disturbance in the fuel flow F, When it flows into the injection hole 31 from the entrance side opening end part 31a, it flows into the inner wall surface part 31c of the injection hole 31 so as to be dense, thereby causing boundary layer separation.

燃料噴射弁１から噴射された燃料は、出側開口端部３１ｂから離れるのにしたがい、燃料液膜断面がＬｆ１からＬｆ２に拡大していくが、燃料主流から燃料液滴Ｌｇが拡散するため、燃料液膜断面がＬｆ２からＬｆ３，Ｌｆ４に縮小し、最終的には、燃料液膜断面が解消する。   As the fuel injected from the fuel injection valve 1 moves away from the outlet opening end 31b, the fuel liquid film cross section expands from Lf1 to Lf2, but the fuel droplet Lg diffuses from the fuel mainstream. The fuel liquid film cross section is reduced from Lf2 to Lf3 and Lf4, and finally the fuel liquid film cross section is eliminated.

燃料液滴Ｌｇの粒径ＰＳと燃料液膜の厚さｈとの間には、下記（１）の式に表す関係が成立する。この式は、ＦＲＡＺＥＲの式と呼ばれるものである。   The relationship expressed by the following equation (1) is established between the particle size PS of the fuel droplet Lg and the thickness h of the fuel liquid film. This equation is called the FRAZER equation.

Ｐｄ＝Ｃ（ｈ／Ｖ２）１／３…（１）
ここで、Ｖ：燃料流速、Ｃ：係数である。 Pd = C (h / V 2 ) 1/3 (1)
Here, V: fuel flow velocity, C: coefficient.

本実施の形態に係る燃料噴射弁１は、噴孔プレート３０の噴孔３１を、入側開口端部３１ａおよび出側開口端部３１ｂの第１の軸Ｘ１，Ｘ２に沿った縦断面において相対する内壁面部３１ｃ，３１ｄの交差角である第１の角度θ１に比べて、入側開口端部３１ａおよび出側開口端部３１ｂの第２の軸Ｙ１，Ｙ２に沿った斜断面において相対する内壁面部３１ｅ，３１ｆの交差角である第２の角度θ２が大きくなるよう形成している。   In the fuel injection valve 1 according to the present embodiment, the nozzle holes 31 of the nozzle hole plate 30 are relatively positioned in a longitudinal section along the first axes X1 and X2 of the inlet side opening end portion 31a and the outlet side opening end portion 31b. Compared to the first angle θ1, which is the crossing angle of the inner wall surface portions 31c and 31d, the inner walls facing each other in the oblique section along the second axes Y1 and Y2 of the inlet side opening end portion 31a and the outlet side opening end portion 31b The second angle θ2, which is the intersection angle of the surface portions 31e and 31f, is formed to be large.

このため、燃料噴射弁１は、燃料を噴孔３１から出側開口端部３１ｂの第２の軸Ｙ２方向に拡がるように下方へ噴射し得る。また、燃料噴射弁１は、噴孔３１の内壁面部３１ｃで密な燃料を流れＦを生じさせ、噴孔３１の内部の内壁面部３１ｄ側の領域に負圧を発生させ、これにより、噴孔３１の内部へ外部空気の流れＡを巻き込むことができる。   For this reason, the fuel injection valve 1 can inject fuel downward from the injection hole 31 so as to expand in the direction of the second axis Y2 of the outlet opening end 31b. The fuel injection valve 1 causes dense fuel to flow through the inner wall surface portion 31c of the injection hole 31 to generate F, and generates a negative pressure in a region on the inner wall surface portion 31d side inside the injection hole 31. The flow A of external air can be entrained in the interior of 31.

よって、燃料噴射弁１は、噴孔３１から外部へ噴射する燃料について、出側開口端部３１ｂの第１の軸Ｘ２方向の燃料液膜の厚さｈを薄くするとともに、燃料液膜を出側開口端部３１ｂの第２の軸Ｙ２方向に十分に拡げて、燃料液滴の微粒化が効果的に促進し得る。   Therefore, the fuel injection valve 1 reduces the thickness h of the fuel liquid film in the direction of the first axis X2 of the outlet opening end 31b for the fuel injected from the injection hole 31 and removes the fuel liquid film. The side opening end portion 31b can be sufficiently expanded in the second axis Y2 direction to effectively promote atomization of the fuel droplets.

本実施の形態に係る燃料噴射弁１は、噴孔プレート３０の噴孔３１の軸線Ｚの向きを、噴孔３１のそれぞれから噴射される燃料の噴霧範囲Ｐにおいて互いに隣接する外縁部分が、燃料噴射方向に平行に並ぶよう設定している。   In the fuel injection valve 1 according to the present embodiment, the outer edge portions adjacent to each other in the spray range P of the fuel injected from each of the nozzle holes 31 in the direction of the axis Z of the nozzle hole 31 of the nozzle hole plate 30 are fuel. It is set to line up in parallel with the injection direction.

このため、燃料噴射弁１は、図３（ａ）および図３（ｂ）に示すように、噴孔プレート３０の側面視および底面視において、それぞれの噴孔３１から噴射される燃料の噴霧範囲Ｐを干渉させず、図３（ｃ）に示すように、燃料液滴の微粒化Ｌｇを促進し得る。   For this reason, as shown in FIGS. 3A and 3B, the fuel injection valve 1 has a spray range of fuel injected from each injection hole 31 in a side view and a bottom view of the injection hole plate 30. Without making P interfere, as shown in FIG. 3C, atomization Lg of the fuel droplets can be promoted.

また、それぞれの噴孔３１から噴射される燃料の噴霧範囲Ｐが干渉しないので、隣接する噴霧範囲Ｐの外縁部分を流通する燃料液滴Ｌｇに作用する空気の影響が減り、燃料液滴Ｌｇが、図３（ａ）に示す矢印Ｓ方向に巻き上げられる。この結果、燃料液滴Ｌｇがさらに微粒化されることになる。   In addition, since the spray ranges P of the fuel injected from the respective injection holes 31 do not interfere with each other, the influence of air acting on the fuel droplets Lg flowing through the outer edge portion of the adjacent spray range P is reduced, and the fuel droplets Lg are reduced. Then, it is wound up in the direction of arrow S shown in FIG. As a result, the fuel droplets Lg are further atomized.

（第２の実施形態）
第２の実施の形態に係る燃料噴射弁２は、図４（ａ）に示すように、弁ボディ１０、弁体２０および噴孔プレート３０を備え、噴孔プレート３０に、プレート厚み方向に貫通する噴孔３２を複数形成している。 (Second Embodiment)
As shown in FIG. 4A, the fuel injection valve 2 according to the second embodiment includes a valve body 10, a valve body 20, and an injection hole plate 30, and penetrates the injection hole plate 30 in the plate thickness direction. A plurality of nozzle holes 32 are formed.

弁ボディ１０、弁体２０および噴孔プレート３０の基本的な構造は、前述の第１の実施の形態のものと同様であり、図４（ａ）〜（ｄ）において図１（ａ）〜（ｄ）と同じ符号を付した部分は、同一物を表している。   The basic structure of the valve body 10, the valve body 20, and the nozzle hole plate 30 is the same as that of the first embodiment described above, and in FIGS. 4 (a) to 4 (d), FIGS. The parts denoted by the same reference numerals as (d) represent the same thing.

噴孔３２は、図４（ｂ）に示す噴孔プレート３０に対する平面視において、流路断面が第１の軸Ｘ１，Ｘ２および第２の軸Ｙ１，Ｙ２を有するオーバル状に形成されている。   The nozzle hole 32 is formed in an oval shape in which the cross section of the flow path has first axes X1 and X2 and second axes Y1 and Y2 in a plan view with respect to the nozzle hole plate 30 shown in FIG.

図４（ｂ）および図４（ｃ）では、第１の軸Ｘ１、第２の軸Ｙ２が長軸であり、第１の軸Ｘ２、第２の軸Ｙ１が短軸である。そして、第１の軸Ｘ１および第２の軸Ｙ１は、噴孔３２において、弁ボディ１０側（図中上側）に位置する入側開口端部３２ａに属し、第１の軸Ｘ２および第２の軸Ｙ２は、噴孔３２において、弁ボディ１０の反対側（図中の下側）に位置する出側開口端部３２ｂに属している。 Shown in FIG. 4 (b) and FIG. 4 (c), the first axis X1, a second axis Y2 is the long axis, the first axis X2, the second axis Y1 is the minor axis. The first axis X1 and the second axis Y1 belong to the inlet side opening end portion 32a located on the valve body 10 side (the upper side in the drawing) in the injection hole 32, and the first axis X2 and the second axis Y1 The axis Y2 belongs to the outlet opening end 32b located on the opposite side (lower side in the figure) of the valve body 10 in the nozzle hole 32.

噴孔３２は、入側開口端部３２ａから出側開口端部３２ｂへ向けて流路断面積が大きくなるようテーパ状に形成されている。噴孔３２は、入側開口端部３２ａの中心（第１の軸Ｘ１と第２の軸Ｙ１との交点）よりも出側開口端部３２ｂの中心（第１の軸Ｘ２と第２の軸Ｙ２との交点）のほうが、噴孔プレート３０の外縁部側に位置するよう形成されている。   The nozzle hole 32 is formed in a taper shape so that the flow path cross-sectional area increases from the inlet side opening end portion 32a toward the outlet side opening end portion 32b. The nozzle hole 32 has a center (first axis X2 and second axis) of the outlet side opening end portion 32b rather than the center of the inlet side opening end portion 32a (intersection of the first axis X1 and the second axis Y1). (The intersection with Y2) is formed so as to be located on the outer edge side of the nozzle hole plate 30.

また、出側開口端部３２ｂの中心は、噴孔プレート３０に対する平面視において、入側開口端部３２ａに属する第１の軸Ｘ１および第２の軸Ｙ１のいずれにも重ならないよう設定されている。 Further, the center of the outlet side opening end portion 32b is set so as not to overlap any of the first axis X1 and the second axis Y1 belonging to the inlet side opening end portion 32a in a plan view with respect to the nozzle hole plate 30. Yes.

噴孔３２は、入側開口端部３２ａおよび出側開口端部３２ｂの第１の軸Ｘ１，Ｘ２に沿った斜断面（図４（ａ）参照）において、相対する内壁面部３２ｃ，３２ｄがなす第１の角度θ１に比べて、入側開口端部３２ａおよび出側開口端部３２ｂの第２の軸Ｙ１，Ｙ２に沿った斜断面（図４（ｃ）および図４（ｄ）参照）において、相対する内壁面部３２ｅ，３２ｆがなす第２の角度θ２が大きくなるよう形成されている。なお、図中、Ｚは、噴孔３２の軸線を表している。   The injection hole 32 is formed by opposed inner wall surface portions 32c and 32d in an oblique cross section (see FIG. 4A) along the first axes X1 and X2 of the inlet side opening end portion 32a and the outlet side opening end portion 32b. Compared to the first angle θ1, in the oblique cross section (see FIGS. 4C and 4D) along the second axes Y1 and Y2 of the entrance side opening end portion 32a and the exit side opening end portion 32b. The second angle θ2 formed by the opposing inner wall surface portions 32e and 32f is formed to be large. In the figure, Z represents the axis of the nozzle hole 32.

噴孔３２の軸線Ｚの向きは、図５（ａ）および図５（ｂ）に示すように、噴孔プレート３０の外部に向けて噴射される燃料の噴霧範囲Ｐの外縁において最も近接する部分が互いに平行に並ぶよう設定されている。   The direction of the axis Z of the injection hole 32 is the closest part at the outer edge of the spray range P of the fuel injected toward the outside of the injection hole plate 30, as shown in FIGS. 5 (a) and 5 (b). Are arranged in parallel to each other.

次に、本実施の形態に係る燃料噴射弁２の作用を説明する。この燃料噴射弁２の基本的な作用は、前述した第１の実施の形態のものと同様であるので、記載を省略する。   Next, the operation of the fuel injection valve 2 according to the present embodiment will be described. Since the basic operation of the fuel injection valve 2 is the same as that of the first embodiment described above, description thereof is omitted.

燃料噴射弁２は、弁ボディ１０の燃料供給通路１１に、図示していないポンプから燃料が送給されている状態で燃料噴射を行う。燃料噴射弁２は、図示していない弁駆動装置によって弁体２０が引き上げられると、燃料供給通路１１の燃料を、弁座１３と弁体２０の下端部の外周面部との間隙、および弁孔１２を経て噴孔３２に流入させ、噴孔３２の出側開口端部３２ｂから外部下方へ噴射する。   The fuel injection valve 2 performs fuel injection in a state where fuel is supplied from a pump (not shown) to the fuel supply passage 11 of the valve body 10. When the valve body 20 is pulled up by a valve driving device (not shown), the fuel injection valve 2 causes the fuel in the fuel supply passage 11 to pass through the gap between the valve seat 13 and the outer peripheral surface portion of the lower end portion of the valve body 20, and the valve hole. 12 is caused to flow into the nozzle hole 32, and sprayed outwardly from the outlet side opening end 32 b of the nozzle hole 32.

これにより、燃料供給通路１１の燃料は、弁座１３と弁体２０の下端部の外周面部との間隙、および弁孔１２を経て噴孔３２に流入し、噴孔３２から燃料噴射弁１の下方に噴射される。   Thus, the fuel in the fuel supply passage 11 flows into the injection hole 32 through the gap between the valve seat 13 and the outer peripheral surface portion of the lower end portion of the valve body 20 and the valve hole 12, and from the injection hole 32 to the fuel injection valve 1. Injected downward.

燃料噴射弁１は、燃料供給通路１１から噴孔３２へと向かう燃料について、弁座１３、弁体２０および噴孔プレート３０により圧力損失を与えて燃料の流れＦに乱れを生じさせ、また、入側開口端部３１ａから噴孔３２に流入する際に、噴孔３１の内壁面部３１ｃに密になるように流入させ、境界層剥離を生じさせる。   The fuel injection valve 1 causes a loss of pressure by the valve seat 13, the valve body 20 and the injection hole plate 30 with respect to the fuel traveling from the fuel supply passage 11 to the injection hole 32, thereby causing a turbulence in the fuel flow F. When it flows into the injection hole 32 from the entrance side opening end part 31a, it flows into the inner wall surface part 31c of the injection hole 31 so as to be dense, thereby causing boundary layer separation.

燃料噴射弁２から噴射された燃料は、出側開口端部３２ｂから離れるのにしたがい、燃料液膜断面が拡大していくが、燃料主流から燃料液滴が拡散するため、燃料液膜断面が徐々に縮小し、最終的には、燃料液膜断面を解消する。   As the fuel injected from the fuel injection valve 2 moves away from the outlet opening end 32b, the fuel liquid film cross section expands. However, since fuel droplets diffuse from the fuel mainstream, the fuel liquid film cross section It gradually shrinks and eventually eliminates the fuel film cross section.

本実施の形態に係る燃料噴射弁２は、噴孔プレート３０の噴孔３２を、入側開口端部３２ａおよび出側開口端部３２ｂの第１の軸Ｘ１，Ｘ２に沿った斜断面において相対する内壁面部３２ｃ，３２ｄの交差角である第１の角度θ１に比べて、入側開口端部３２ａおよび出側開口端部３２ｂの第２の軸Ｙ１，Ｙ２に沿った斜断面において相対する内壁面部３２ｅ，３２ｆの交差角である第２の角度θ２が大きくなるよう形成している。   In the fuel injection valve 2 according to the present embodiment, the injection hole 32 of the injection hole plate 30 is relatively opposed to each other in the oblique cross section along the first axes X1 and X2 of the inlet side opening end part 32a and the outlet side opening end part 32b. Compared to the first angle θ1, which is the crossing angle of the inner wall surface portions 32c, 32d, the inner walls are opposed to each other in the oblique cross section along the second axes Y1, Y2 of the inlet side opening end portion 32a and the outlet side opening end portion 32b. The second angle θ2, which is the intersection angle of the surface portions 32e and 32f, is formed to be large.

このため、燃料噴射弁２は、燃料を噴孔３２から出側開口端部３２ｂの第２の軸Ｙ２方向に拡がるように下方へ噴射し得る。また、燃料噴射弁２は、噴孔３２の内壁面部３２ｃで密な燃料を流れＦを生じさせ、噴孔３２の内部の内壁面部３２ｄ側の領域に負圧を発生させ、これにより、噴孔３２の内部へ外部空気の流れＡを巻き込むことができる。   For this reason, the fuel injection valve 2 can inject the fuel downward from the injection hole 32 so as to expand in the direction of the second axis Y2 of the outlet opening end 32b. Further, the fuel injection valve 2 causes a dense fuel to flow F at the inner wall surface portion 32c of the nozzle hole 32, thereby generating a negative pressure in a region on the inner wall surface portion 32d side inside the nozzle hole 32. The flow A of external air can be entrained in the interior of 32.

よって、燃料噴射弁２は、噴孔３２から外部へ噴射する燃料について、出側開口端部３２ｂの第１の軸Ｘ２方向の燃料液膜の厚さｈ（図２参照）を薄くするとともに、燃料液膜を出側開口端部３２ｂの第２の軸Ｙ２方向に十分に拡げて、燃料液滴の微粒化が効果的に促進し得る。   Therefore, the fuel injection valve 2 reduces the thickness h (see FIG. 2) of the fuel liquid film in the first axis X2 direction of the outlet opening end portion 32b for the fuel injected from the injection hole 32 to the outside. The fuel liquid film can be sufficiently expanded in the direction of the second axis Y2 of the outlet opening end portion 32b, and atomization of fuel droplets can be effectively promoted.

本実施の形態に係る燃料噴射弁２は、出側開口端部３２ｂの中心を、噴孔プレート３０に対する平面視において、入側開口端部３２ａに属する第１の軸Ｘ１および第２の軸Ｙ２のいずれにも重ならないよう設定している。   The fuel injection valve 2 according to the present embodiment has a first axis X1 and a second axis Y2 belonging to the inlet opening end 32a in the plan view with respect to the nozzle hole plate 30, with the center of the outlet opening end 32b. It is set not to overlap any of the above.

よって、燃料噴射弁２は、微粒化した燃料を、入側開口端部３２ａおよび出側開口端部３２ｂの第２の軸Ｙ１，Ｙ２に沿った斜断面（図５（ｄ）参照）において、噴孔３２の軸線Ｚを中心に非対称な範囲に噴霧する。   Therefore, the fuel injection valve 2 causes the atomized fuel to flow into the oblique cross-section (see FIG. 5 (d)) along the second axes Y1 and Y2 of the inlet side opening end portion 32a and the outlet side opening end portion 32b. Spraying is performed in an asymmetrical range around the axis Z of the nozzle hole 32.

本実施の形態に係る燃料噴射弁２は、噴孔プレート３０の噴孔３２の軸線Ｚの向きを、噴孔３２のそれぞれから噴射される燃料の噴霧範囲Ｐにおいて互いに隣接する外縁部分が、燃料噴射方向に平行に並ぶよう設定している。   In the fuel injection valve 2 according to the present embodiment, the direction of the axis Z of the injection hole 32 of the injection hole plate 30 is such that the outer edge portions adjacent to each other in the spray range P of the fuel injected from each of the injection holes 32 are fuel. It is set to line up in parallel with the injection direction.

このため、燃料噴射弁２は、図５（ａ）および図５（ｂ）に示すように、噴孔プレート３０の側面視および底面視において、それぞれの噴孔３２から噴射される燃料の噴霧範囲Ｐを干渉させず、図５（ｃ）に示すように、燃料液滴の微粒化を促進し得る。   For this reason, as shown in FIGS. 5A and 5B, the fuel injection valve 2 has a spray range of fuel injected from each nozzle hole 32 in a side view and a bottom view of the nozzle hole plate 30. As shown in FIG. 5C, atomization of fuel droplets can be promoted without causing P to interfere.

また、それぞれの噴孔３２から噴射される燃料の噴霧範囲Ｐが干渉しないので、隣接する噴霧範囲Ｐの外縁部分を流通する燃料液滴に作用する空気の影響が減り、燃料液滴が、図５（ａ）に示す矢印Ｓ方向に巻き上げられる。この結果、燃料液滴がさらに微粒化されることになる。   Further, since the spray ranges P of the fuel injected from the respective injection holes 32 do not interfere with each other, the influence of air acting on the fuel droplets flowing through the outer edge portion of the adjacent spray range P is reduced, and the fuel droplets are It is wound up in the direction of arrow S shown in FIG. As a result, the fuel droplets are further atomized.

なお、本発明に係る燃料噴射弁の技術的範囲は、上述した実施の形態に限定されるものでなく、本発明の範囲を逸脱しない限り、特許請求の範囲に記載した各構成要素の種々の変更を含むものである。   It should be noted that the technical scope of the fuel injection valve according to the present invention is not limited to the above-described embodiment, and various components of the constituent elements described in the claims can be made without departing from the scope of the present invention. Includes changes.

以上のように、本発明に係る燃料噴射弁は、複数の噴孔から外部へ噴射される燃料液滴の微粒化を促進できるという効果を奏するもので、各種の内燃機関に有用である。   As described above, the fuel injection valve according to the present invention has an effect of promoting atomization of fuel droplets injected from a plurality of nozzle holes to the outside, and is useful for various internal combustion engines.

１，２…燃料噴射弁、１０…弁ボディ、１２…弁孔、２０…弁体、３０…噴孔プレート、３１，３２…噴孔、３１ａ，３２ａ…入側開口端部、３１ｂ，３２ｂ…出側開口端部、３１ｃ，３２ｃ…内壁面部、３１ｄ，３２ｄ…内壁面部、３１ｅ，３２ｅ…内壁面部、３１ｆ，３２ｆ…内壁面部、Ｐ…噴霧範囲、Ｘ１，Ｘ２…第１の軸、Ｙ１，Ｙ２…第２の軸、Ｚ…軸線、θ１…第１の角度、θ２…第２の角度   DESCRIPTION OF SYMBOLS 1, 2 ... Fuel injection valve, 10 ... Valve body, 12 ... Valve hole, 20 ... Valve body, 30 ... Injection hole plate, 31, 32 ... Injection hole, 31a, 32a ... Inlet side opening end part, 31b, 32b ... Outlet opening end, 31c, 32c ... inner wall surface portion, 31d, 32d ... inner wall surface portion, 31e, 32e ... inner wall surface portion, 31f, 32f ... inner wall surface portion, P ... spraying range, X1, X2 ... first axis, Y1, Y2 ... second axis, Z ... axis, θ1 ... first angle, θ2 ... second angle

Claims (4)

弁孔を有する弁ボディと、
前記弁孔を開閉するよう前記弁ボディの内部に設けた弁体と、
前記弁孔を覆うよう弁ボディに設けた噴孔プレートとを備え、
前記噴孔プレートに、プレート厚み方向に貫通する噴孔を複数形成した燃料噴射弁であって、
前記噴孔は、入側開口端部と出側開口端部とを有し、
前記噴孔の流路断面は、前記噴孔プレートに対する平面視において、互いに交差した第１の軸および第２の軸を有するオーバル状に形成され、
前記入側開口端部に属する前記第１の軸と前記出側開口端部に属する前記第１の軸とが平行であり、
前記入側開口端部に属する前記第２の軸と前記出側開口端部に属する前記第２の軸とが平行であり、
前記噴孔の入側開口端部に属する第１の軸が長軸で、かつ前記入側開口端部に属する第２の軸が短軸であり、
前記噴孔の出側開口端部に属する第１の軸が短軸で、かつ前記出側開口端部に属する第２の軸が長軸であり、
前記出側開口端部において前記第１の軸と前記第２の軸との交点である前記出側開口部の中心は、前記入側開口端部において前記第１の軸と前記第２の軸との交点である前記入側開口端部の中心よりも前記噴孔プレートの外縁付側に位置するように形成され、
前記出側開口端部の中心と前記入側開口端部の中心とを結ぶ線である前記噴孔の軸線の向きは、前記噴孔のそれぞれから噴射される燃料の噴霧範囲において互いに隣接する外縁部分が燃料噴射方向に平行に並ぶよう設定されていることを特徴とする燃料噴射弁。 A valve body having a valve hole;
A valve body provided inside the valve body to open and close the valve hole;
An injection hole plate provided in the valve body so as to cover the valve hole,
A fuel injection valve in which a plurality of injection holes penetrating in the plate thickness direction is formed in the injection hole plate,
The nozzle hole has an inlet opening end and an outlet opening end,
The flow passage cross section of the nozzle hole is formed in an oval shape having a first axis and a second axis intersecting each other in a plan view with respect to the nozzle hole plate,
The first axis belonging to the entry-side opening end and the first axis belonging to the exit-side opening end are parallel,
The second axis belonging to the entry-side opening end and the second axis belonging to the exit-side opening end are parallel,
The first axis belonging to the inlet side opening end of the nozzle hole is a long axis, and the second axis belonging to the inlet side opening end is a short axis,
The first axis belonging to the outlet side opening end of the nozzle hole is a short axis, and the second axis belonging to the outlet side opening end is a long axis,
The center of the outlet opening that is the intersection of the first axis and the second axis at the outlet opening end is the first axis and the second axis at the inlet opening end. Is formed so as to be located on the outer edge side of the nozzle hole plate from the center of the entrance-side opening end that is the intersection with
The direction of the axis of the nozzle hole, which is a line connecting the center of the outlet opening end and the center of the inlet opening end, is an outer edge adjacent to each other in the spray range of fuel injected from each of the nozzle holes A fuel injection valve characterized in that the portion is set so as to be aligned in parallel to the fuel injection direction. 前記噴孔の流路断面は、前記弁ボディ側に位置する入側開口端部から前記弁ボディの反対側に位置する出側開口端部へ向けて流路断面積が大きくなるようテーパ状に形成されていることを特徴とする請求項１に記載の燃料噴射弁。   The flow passage cross section of the nozzle hole is tapered so that the cross sectional area of the flow passage increases from the inlet opening end located on the valve body side to the outlet opening end located on the opposite side of the valve body. The fuel injection valve according to claim 1, wherein the fuel injection valve is formed. 前記噴孔は、前記入側開口端部および前記出側開口端部の第１の軸に沿った断面において相対する内壁面部がなす第１の角度よりも、前記入側開口端部および前記出側開口端部の第２の軸に沿った断面において相対する内壁面部がなす第２の角度のほうが大きくなるよう形成されている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。   The injection hole has a width greater than a first angle formed by opposing inner wall surfaces in a cross section along the first axis of the entry side opening end and the exit side opening end. 3. The fuel injection according to claim 1, wherein the second angle formed by the opposed inner wall surface portions in the cross section along the second axis of the side opening end portion is formed to be larger. valve. 前記噴孔の前記出側開口端部の中心は、前記噴孔プレートに対する平面視において、前記噴孔の前記入側開口端部の第１の軸および第２の軸のいずれにも重ならないよう設定されていることを特徴とする請求項１ないし請求項３のいずれか１項に記載の燃料噴射弁。   The center of the outlet opening end of the nozzle hole does not overlap with either the first axis or the second axis of the inlet opening end of the nozzle hole in a plan view with respect to the nozzle hole plate. The fuel injection valve according to any one of claims 1 to 3, wherein the fuel injection valve is set.
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