JP6647119B2 - Fuel injection valve and method of manufacturing fuel injection valve - Google Patents

Fuel injection valve and method of manufacturing fuel injection valve Download PDF

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JP6647119B2
JP6647119B2 JP2016074129A JP2016074129A JP6647119B2 JP 6647119 B2 JP6647119 B2 JP 6647119B2 JP 2016074129 A JP2016074129 A JP 2016074129A JP 2016074129 A JP2016074129 A JP 2016074129A JP 6647119 B2 JP6647119 B2 JP 6647119B2
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fuel injection
wiring
main body
injection valve
opening
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JP2017186917A (en
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保文 魚住
保文 魚住
将太 藤井
将太 藤井
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Bosch Corp
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Description

本発明は、エンジンの燃焼室に燃料を噴射する燃料噴射弁（インジェクタ）、およびその製造方法に関する。   The present invention relates to a fuel injection valve (injector) for injecting fuel into a combustion chamber of an engine, and a method for manufacturing the same.

従来の燃料噴射弁においては、噴孔を開閉させるためのピエゾアクチュエータ等を収容するボディーと、このボディーと回路部品との間に介在するよう配置されたモールド樹脂とを備えるものが提案されている（例えば、特許文献１参照）。この燃料噴射弁においては、ボディーの外周面とモールド樹脂の内周面との間がＯリングによって環状にシールされ、水の侵入を防止している。   2. Description of the Related Art A conventional fuel injection valve has been proposed which includes a body for accommodating a piezo actuator for opening and closing an injection hole, and a mold resin interposed between the body and a circuit component. (For example, see Patent Document 1). In this fuel injection valve, the space between the outer peripheral surface of the body and the inner peripheral surface of the mold resin is annularly sealed by an O-ring to prevent water from entering.

特開２００９−１１４９７０号公報JP 2009-114970 A

一般に、ピエゾアクチュエータ等のアクチュエータに接続された配線が通る本体の開口は、例えば樹脂により形成されたモールド材などにより覆われ、本体内部への水分の浸入が抑制されている。また、本体内の開口からアクチュエータへ至る経路にはシリコンシーリングなどが施されて、アクチュエータへの水分の侵入が抑制されている。このような構成によれば、耐水性に関する規格（例えば、日本工業規格：水に対する保護等級）を満たし、通常想定される使用環境において耐水性を十分に確保することができる。
しかしながら、例えばエンジンルームが水で頻繁に洗浄される場合など、燃料噴射弁が想定以上の水分に曝される場合がある。このため、更なる耐水性の向上が望まれている。 Generally, an opening of a main body through which a wiring connected to an actuator such as a piezo actuator passes is covered with, for example, a mold material formed of a resin or the like, so as to suppress infiltration of moisture into the inside of the main body. In addition, silicon sealing or the like is applied to the path from the opening in the main body to the actuator, so that entry of moisture into the actuator is suppressed. According to such a configuration, it is possible to satisfy a standard relating to water resistance (for example, Japanese Industrial Standard: protection class against water) and sufficiently secure water resistance in a normally assumed use environment.
However, for example, when the engine room is frequently washed with water, the fuel injector may be exposed to more moisture than expected. For this reason, further improvement in water resistance is desired.

上記特許文献１に記載の燃料噴射弁は、ボディーの外周面とモールド樹脂の内周面との間にＯリングを設けている。即ち、ボディーとモールド樹脂との界面にＯリングを配置するので構成が複雑となる課題がある。また、モールド樹脂を覆うコネクタハウジングとボディーとの間にはＯリングが配置されていないため、モールド樹脂とコネクタハウジングとの界面から水分が侵入する課題がある。   The fuel injection valve described in Patent Document 1 has an O-ring provided between the outer peripheral surface of the body and the inner peripheral surface of the mold resin. That is, since the O-ring is arranged at the interface between the body and the mold resin, there is a problem that the configuration becomes complicated. Further, since no O-ring is arranged between the connector housing and the body that cover the mold resin, there is a problem that moisture invades from the interface between the mold resin and the connector housing.

本発明は、上記のような課題を背景になされたもので、簡易な構成により耐水性を向上することができる燃料噴射弁及び燃料噴射弁の製造方法を得るものである。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel injection valve and a method for manufacturing the fuel injection valve, which can improve water resistance with a simple configuration.

本発明に係る燃料噴射弁は、アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁であって、前記アクチュエータに接続された配線が通る配線通路が形成された本体と、前記配線通路へ挿入され前記配線通路を塞ぐ閉塞部材と、を備え、前記配線通路は、一端が前記本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、前記配線通路の内壁の前記閉塞部材との界面に、周方向に延びる溝が形成され、前記溝の端部が前記開口と繋がるものである。   A fuel injection valve according to the present invention is a fuel injection valve in which a fuel injection hole is opened and closed by energizing an actuator, wherein a main body in which a wiring path through which a wiring connected to the actuator is formed is formed, and A closing member inserted to close the wiring passage, the wiring passage having one end open to the side surface of the main body and the other end communicating with the actuator disposed closer to the fuel injection hole than the opening. A groove extending in a circumferential direction is formed at an interface between the inner wall of the wiring passage and the closing member, and an end of the groove is connected to the opening.

本発明に係る燃料噴射弁の製造方法は、アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁の製造方法であって、一端が本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、前記アクチュエータに接続された配線が通る配線通路を形成する工程と、前記配線通路の内壁に、周方向に延び、端部が前記開口と繋がる溝を形成する工程と、前記配線通路を塞ぐ閉塞部材を、少なくとも前記配線通路の前記溝まで挿入する工程と、を有するものである。   The method for manufacturing a fuel injection valve according to the present invention is a method for manufacturing a fuel injection valve in which a fuel injection hole is opened and closed by energizing an actuator, wherein one end is opened on a side surface of the main body, and the other end is more than the opening. A step of forming a wiring passage communicating with the actuator disposed on the fuel injection hole side and through which a wiring connected to the actuator passes; and an inner wall of the wiring passage, which extends in a circumferential direction, and has an end formed with the opening. A step of forming a connecting groove; and a step of inserting a closing member for closing the wiring passage at least up to the groove of the wiring passage.

本発明は、配線通路の内壁の閉塞部材との界面に、周方向に延びる溝が形成され、溝の端部が本体の側面の開口と繋がる。このため、配線通路の内壁の閉塞部材との界面に侵入した水分が溝に溜まり、溝の端部から本体の外へ排出される。よって、簡易な構成により耐水性を向上することができる。   According to the present invention, a groove extending in the circumferential direction is formed at the interface between the inner wall of the wiring passage and the closing member, and the end of the groove is connected to the opening on the side surface of the main body. For this reason, the moisture that has entered the interface between the inner wall of the wiring passage and the closing member accumulates in the groove and is discharged out of the main body from the end of the groove. Therefore, the water resistance can be improved with a simple configuration.

実施の形態１に係る燃料噴射弁の概略構成を示す斜視図である。FIG. 2 is a perspective view illustrating a schematic configuration of a fuel injection valve according to Embodiment 1. 実施の形態１に係る燃料噴射弁の概略構成を示す要部断面図である。FIG. 2 is a cross-sectional view of a main part showing a schematic configuration of the fuel injection valve according to the first embodiment. 図２のＡ部拡大図である。FIG. 3 is an enlarged view of a portion A in FIG. 2. 実施の形態１に係る燃料噴射弁の本体の要部外形図である。FIG. 2 is an external view of a main part of a main body of the fuel injection valve according to Embodiment 1. 図４のＢ部拡大図である。FIG. 5 is an enlarged view of a portion B in FIG. 4. アクチュエータへの水分の侵入経路を説明する図である。FIG. 3 is a diagram illustrating a route of entry of moisture into an actuator. 配線通路への水分の侵入経路と排水経路とを説明する燃料噴射弁の要部断面図である。FIG. 3 is a cross-sectional view of a main part of the fuel injection valve, illustrating a route of water entry into a wiring passage and a drainage route. 図７のＡ部拡大図において、配線通路と接合部材との界面に隙間が発生した状態を示す図である。FIG. 8 is a diagram showing a state in which a gap is generated at an interface between a wiring path and a joining member in the enlarged view of a portion A in FIG. 7. 配線通路への水分の侵入経路と排水経路とを説明する本体の要部外形図である。FIG. 3 is an external view of a main part of a main body for explaining a route of entry of water into a wiring passage and a drainage route. 図９のＢ部拡大図である。It is the B section enlarged view of FIG. 実施の形態２に係る燃料噴射弁の概略構成を示す要部断面図である。FIG. 9 is a cross-sectional view of a main part showing a schematic configuration of a fuel injection valve according to Embodiment 2. 実施の形態２に係る燃料噴射弁の本体の要部外形図である。FIG. 9 is an outline drawing of a main part of a main body of a fuel injection valve according to Embodiment 2.

以下、本発明の燃料噴射弁に関する実施の形態について具体的に説明する。ただし、この実施の形態は本発明の一態様を示すものであり、本発明を限定するものではなく、本発明の範囲内で任意に変更することが可能である。
なお、以下の各実施の形態においては、燃料噴射孔が形成された側の端部を燃料噴射弁の下端とし、燃料噴射孔側の端部とは反対側の端部を燃料噴射弁の上端として、燃料噴射弁を説明していく。 Hereinafter, embodiments of the fuel injection valve of the present invention will be specifically described. However, this embodiment shows one embodiment of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.
In the following embodiments, the end on the side where the fuel injection hole is formed is the lower end of the fuel injection valve, and the end opposite to the end on the side of the fuel injection hole is the upper end of the fuel injection valve. The fuel injection valve will be described as follows.

実施の形態１．
（構成）
図１は、実施の形態１に係る燃料噴射弁の概略構成を示す斜視図である。図２は、実施の形態１に係る燃料噴射弁の概略構成を示す要部断面図である。
図１及び図２に示すように、本実施の形態１に係る燃料噴射弁１は、下端に燃料噴射孔１２０が形成された本体１００を備えている。本体１００は、例えば外周が円形状に形成されている。また本体１００は、例えば金属で形成されている。本体１００の上端側には、燃料噴射孔１２０に燃料を供給する燃料供給用接続口１５０と、燃料噴射孔１２０から噴射されなかった余剰燃料を外部に排出するための燃料排出用接続口１４０が設けられている。 Embodiment 1 FIG.
(Constitution)
FIG. 1 is a perspective view showing a schematic configuration of the fuel injection valve according to the first embodiment. FIG. 2 is a cross-sectional view of a main part showing a schematic configuration of the fuel injection valve according to the first embodiment.
As shown in FIGS. 1 and 2, the fuel injection valve 1 according to the first embodiment includes a main body 100 having a fuel injection hole 120 formed at a lower end. The main body 100 has, for example, a circular outer periphery. The main body 100 is formed of, for example, metal. A fuel supply connection port 150 for supplying fuel to the fuel injection hole 120 and a fuel discharge connection port 140 for discharging excess fuel not injected from the fuel injection hole 120 to the outside are provided at the upper end side of the main body 100. Is provided.

本体１００の内部には、通電によって燃料噴射孔１２０を開閉するアクチュエータが収納されている。アクチュエータとしては、ピエゾスタックの伸縮に伴う変位を利用してニードルを駆動するピエゾアクチュエータを用いることができる。本体１００には、アクチュエータに接続された配線２１０が通る配線通路１０が形成されている。   An actuator that opens and closes the fuel injection hole 120 when energized is housed inside the main body 100. As the actuator, a piezo actuator that drives a needle using a displacement accompanying expansion and contraction of a piezo stack can be used. In the main body 100, a wiring path 10 through which a wiring 210 connected to the actuator passes is formed.

配線通路１０は、一端が本体１００の側面に開口し、他端が開口よりも下端側に配置されたアクチュエータと連通する。また、配線通路１０は、本体１００の側面側に形成された大径部１０２と、アクチュエータ側に形成され、大径部１０２よりも開口面積が小さい小径部１０１と、大径部１０２と小径部１０１と境目である段差面１０３とを有している。配線通路１０は、本体１００の側面から中央へ向かって下端側へ傾斜し、アクチュエータへ至る。   The wiring passage 10 has one end open to the side surface of the main body 100 and the other end communicating with an actuator disposed at a lower end side of the opening. The wiring passage 10 includes a large-diameter portion 102 formed on the side surface of the main body 100, a small-diameter portion 101 formed on the actuator side and having an opening area smaller than the large-diameter portion 102, and the large-diameter portion 102 and the small-diameter portion. 101 and a step surface 103 serving as a boundary. The wiring passage 10 is inclined from the side surface of the main body 100 toward the lower end toward the center, and reaches the actuator.

配線２１０は、一端がアクチュエータと電気的に接続され、他端がコネクタ１３０の端子と電気的に接続されている。また、配線２１０は、本体１００の配線通路１０に挿入された接合部材２００に保持されている。この接合部材２００は、配線通路１０における本体１００の側面からアクチュエータへ至る経路の一部に設けられ、配線２１０を配線通路１０の中央部に保持する。また、接合部材２００は、配線通路１０における段差面１０３と接するように設けられている。   The wiring 210 has one end electrically connected to the actuator and the other end electrically connected to the terminal of the connector 130. The wiring 210 is held by the joining member 200 inserted into the wiring passage 10 of the main body 100. The joining member 200 is provided at a part of the path from the side surface of the main body 100 to the actuator in the wiring path 10, and holds the wiring 210 at the center of the wiring path 10. The joining member 200 is provided so as to be in contact with the step surface 103 in the wiring passage 10.

配線通路１０における大径部１０２を含む本体１００の側面の開口は、モールド材１１０によって覆われている。例えば、モールド材１１０は、本体１００の開口を含む本体１００の側面を囲むように形成されている。モールド材１１０は、例えば樹脂で形成されている。なお、モールド材１１０と、コネクタ１３０とを例えば一体形成しても良い。なお、モールド材１１０及び接合部材２００は、本発明における「閉塞部材」に相当する。   An opening on the side surface of the main body 100 including the large-diameter portion 102 in the wiring passage 10 is covered with a molding material 110. For example, the molding material 110 is formed so as to surround the side surface of the main body 100 including the opening of the main body 100. The molding material 110 is formed of, for example, a resin. Note that the molding material 110 and the connector 130 may be integrally formed, for example. In addition, the molding material 110 and the joining member 200 correspond to the “closing member” in the present invention.

配線通路１０の内壁とモールド材１１０との界面には、配線通路１０の周方向に延びる溝２０が形成されている。詳細を図３〜図５を用いて説明する。   A groove 20 extending in the circumferential direction of the wiring passage 10 is formed at an interface between the inner wall of the wiring passage 10 and the molding material 110. Details will be described with reference to FIGS.

図３は、図２のＡ部拡大図である。図４は、実施の形態１に係る燃料噴射弁の本体の要部外形図である。図５は、図４のＢ部拡大図である。なお、図４においては、本体１００の配線通路１０が開口する側面の外形を示す。
図３〜図５に示すように、段差面１０３は、本体１００の中央側から側面へ向かって下端側に傾斜し、下端側の縁部が本体１００の側面の開口と繋がる。溝２０は、段差面１０３と大径部１０２との接続部に沿って形成され、溝２０の端部が本体１００の側面の開口と繋がる。即ち、溝２０は、本体１００の側面の開口と繋がる端部が、最も下端に近い位置に形成されている。 FIG. 3 is an enlarged view of a portion A in FIG. FIG. 4 is an external view of a main part of a main body of the fuel injection valve according to the first embodiment. FIG. 5 is an enlarged view of a portion B in FIG. FIG. 4 shows the outer shape of the side surface of the main body 100 where the wiring passage 10 opens.
As shown in FIGS. 3 to 5, the step surface 103 is inclined from the center of the main body 100 toward the lower side toward the lower side, and the lower end side edge is connected to the opening on the side surface of the main body 100. The groove 20 is formed along the connecting portion between the step surface 103 and the large diameter portion 102, and the end of the groove 20 is connected to the opening on the side surface of the main body 100. That is, the groove 20 has an end connected to the opening on the side surface of the main body 100 formed at a position closest to the lower end.

なお、本実施の形態１においては、溝２０は、段差面１０３と大径部１０２との接続部に沿って形成されているが、本発明はこれに限定されない。例えば、小径部１０１と大径部１０２との間の段差面１０３に溝２０を形成しても良い。また、溝２０の端部の少なくとも一方が、本体１００の側面の開口と繋がる構成でも良い。また、溝２０の断面形状は、例えば図３〜図５に示すように、段差面１０３に対して断面半円状に凹んだ形状に限らず任意の形状で良い。即ち、溝２０は、配線通路１０の内壁において、本体１００の下端側から上端側へ向かう方向の壁面経路が形成される構成であれば良い。
また、本実施の形態１においては、接合部材２００は、配線通路１０の大径部１０２と接していないが、本発明はこれに限定されない。例えば、接合部材２００を、配線通路１０の大径部１０２及び段差面１０３と接するように設けても良い。この場合、溝２０を、配線通路１０の内壁と接合部材２００との界面に設けても良い。 In the first embodiment, the groove 20 is formed along the connecting portion between the step surface 103 and the large diameter portion 102, but the present invention is not limited to this. For example, the groove 20 may be formed on the step surface 103 between the small diameter portion 101 and the large diameter portion 102. Further, at least one of the ends of the groove 20 may be connected to the opening on the side surface of the main body 100. The cross-sectional shape of the groove 20 is not limited to a shape that is recessed in a semicircular cross section with respect to the step surface 103, as shown in FIGS. That is, the groove 20 may have a configuration in which a wall surface path in a direction from the lower end side to the upper end side of the main body 100 is formed on the inner wall of the wiring passage 10.
Further, in the first embodiment, the joining member 200 is not in contact with the large diameter portion 102 of the wiring passage 10, but the present invention is not limited to this. For example, the joining member 200 may be provided so as to be in contact with the large-diameter portion 102 and the step surface 103 of the wiring passage 10. In this case, the groove 20 may be provided at the interface between the inner wall of the wiring passage 10 and the joining member 200.

（製造方法）
次に、本実施の形態１における燃料噴射弁１の製造方法を説明する。
まず、本体１００に、小径部１０１と大径部１０２と段差面１０３とを有する配線通路１０を形成する。次に、配線通路１０の段差面１０３と大径部１０２との接続部に沿って、端部が本体１００の側面の開口と繋がる溝２０を形成する。次に、配線２１０を保持する接合部材２００を、配線通路１０における段差面１０３と接するよう挿入する。その後、配線通路１０における大径部１０２を含む本体１００の側面の開口を、モールド材１１０によって覆う。これにより、配線通路１０の内壁とモールド材１１０との界面に溝２０が位置する。 (Production method)
Next, a method of manufacturing the fuel injection valve 1 according to the first embodiment will be described.
First, the wiring passage 10 having the small diameter portion 101, the large diameter portion 102, and the step surface 103 is formed in the main body 100. Next, along the connecting portion between the step surface 103 of the wiring passage 10 and the large-diameter portion 102, the groove 20 whose end is connected to the opening on the side surface of the main body 100 is formed. Next, the joining member 200 holding the wiring 210 is inserted so as to be in contact with the step surface 103 in the wiring passage 10. After that, the opening on the side surface of the main body 100 including the large-diameter portion 102 in the wiring passage 10 is covered with the molding material 110. Thereby, the groove 20 is located at the interface between the inner wall of the wiring passage 10 and the molding material 110.

なお、本体１００に配線通路１０を形成する工程と、接合部材２００を配線通路１０に挿入する工程と、本体１００の側面の開口をモールド材１１０によって覆う工程とは、溝２０を形成していない燃料噴射弁１と同様の製造方法を適用することができる。即ち、既設の製造工程に対して溝２０を形成する工程を追加するのみで、本実施の形態１に係る燃料噴射弁１を製造することが可能である。   The step of forming the wiring passage 10 in the main body 100, the step of inserting the joining member 200 into the wiring path 10, and the step of covering the opening on the side surface of the main body 100 with the mold material 110 do not form the groove 20. The same manufacturing method as that of the fuel injection valve 1 can be applied. That is, the fuel injection valve 1 according to the first embodiment can be manufactured only by adding a process of forming the groove 20 to the existing manufacturing process.

なお、溝２０を形成していない燃料噴射弁１においても、モールド材１１０によって本体１００内部への水分の浸入が抑制されている。例えば、耐水性に関する規格（例えば、日本工業規格：水に対する保護等級）などを満たす耐水性が確保されている。   In the fuel injection valve 1 in which the groove 20 is not formed, the infiltration of moisture into the main body 100 is suppressed by the molding material 110. For example, water resistance that satisfies the standards for water resistance (for example, Japanese Industrial Standard: protection class against water) is ensured.

（作用）
ここで、本体１００の配線通路１０に溝２０を形成していない構成における水の侵入経路について説明する。 (Action)
Here, a water intrusion path in a configuration in which the groove 20 is not formed in the wiring passage 10 of the main body 100 will be described.

図６は、アクチュエータへの水分の侵入経路を説明する図である。
燃料噴射弁１を構成する各部の材料は、エンジンの駆動に伴う熱により膨張し、エンジンの停止に伴い冷却され収縮する。燃料噴射弁１の本体１００は例えば金属で形成され、モールド材１１０及び接合部材２００は例えば樹脂で形成された場合、線膨張係数の違いにより、本体１００とモールド材１１０及び接合部材２００との界面に隙間が発生する場合がある。図６に示すように、本体１００とモールド材１１０との界面の端部（位置Ｘ）に水分が残留していると、本体１００の配線通路１０とモールド材１１０との界面に発生した隙間および配線通路１０と接合部材２００との界面に発生した隙間を伝って、本体１００の側面の開口からアクチュエータへ至る経路に水分（水及び水蒸気）が侵入する場合がある。 FIG. 6 is a diagram illustrating a route of entry of moisture into the actuator.
The material of each part constituting the fuel injection valve 1 expands due to heat generated when the engine is driven, and is cooled and contracted when the engine is stopped. When the main body 100 of the fuel injection valve 1 is formed of, for example, a metal and the molding material 110 and the joining member 200 are formed of, for example, a resin, the interface between the main body 100 and the molding material 110 and the joining member 200 due to a difference in linear expansion coefficient. There is a case where a gap is generated. As shown in FIG. 6, when moisture remains at the end (position X) of the interface between the main body 100 and the molding material 110, the gap generated at the interface between the wiring passage 10 of the main body 100 and the molding material 110 is reduced. Water (water and water vapor) may enter the path from the opening on the side surface of the main body 100 to the actuator through the gap generated at the interface between the wiring passage 10 and the joining member 200.

一方、本実施の形態１の燃料噴射弁１は、配線通路１０の内壁に溝２０を形成しているため、アクチュエータへの水分の侵入を抑制することができる。詳細を図７〜図１０を用いて説明する。   On the other hand, in the fuel injection valve 1 of the first embodiment, since the groove 20 is formed in the inner wall of the wiring passage 10, it is possible to suppress the entry of moisture into the actuator. Details will be described with reference to FIGS.

図７は、配線通路への水分の侵入経路と排水経路とを説明する燃料噴射弁の要部断面図である。図８は、図７のＡ部拡大図において、配線通路と接合部材との界面に隙間が発生した状態を示す図である。図９は、配線通路への水分の侵入経路と排水経路とを説明する本体の要部外形図である。図１０は、図９のＢ部拡大図である。なお、図８においては、本体１００の配線通路１０が開口する側面の外形を示す。
図７〜図１０において、本体１００とモールド材１１０との界面の端部（位置Ｘ）から侵入した水分は、配線通路１０の大径部１０２とモールド材１１０との界面に発生した隙間を伝って、大径部１０２と段差面１０３との接続部に到達する。配線通路１０の大径部１０２と段差面１０３との接続部に到達した水分は、大径部１０２と段差面１０３との接続に沿って形成された溝２０に溜まる。これにより、配線通路１０に侵入した水分の小径部１０１への侵入が抑制される。 FIG. 7 is a cross-sectional view of a main part of the fuel injection valve, illustrating a route of water entry into a wiring passage and a drainage route. FIG. 8 is a diagram showing a state where a gap is generated at an interface between the wiring passage and the joining member in the enlarged view of the portion A in FIG. FIG. 9 is an external view of a main part of the main body for explaining a route of water entry into a wiring passage and a drainage route. FIG. 10 is an enlarged view of a portion B in FIG. FIG. 8 shows the outer shape of the side surface where the wiring passage 10 of the main body 100 is opened.
7 to 10, the moisture that has entered from the end (position X) of the interface between the main body 100 and the molding material 110 travels along the gap generated at the interface between the large diameter portion 102 of the wiring passage 10 and the molding material 110. As a result, it reaches the connection between the large diameter portion 102 and the step surface 103. The water that has reached the connection between the large-diameter portion 102 and the step surface 103 of the wiring passage 10 accumulates in the groove 20 formed along the connection between the large-diameter portion 102 and the step surface 103. Thereby, the intrusion of the moisture that has entered the wiring passage 10 into the small diameter portion 101 is suppressed.

溝２０に溜まった水分は、溝２０を本体１００の側面側へ向かって進み、溝２０の端部から本体１００の側面とモールド材１１０との界面の隙間に伝わる。そして、本体１００の側面とモールド材１１０との界面の隙間に伝わった水分は、本体１００とモールド材１１０との界面の端部（位置Ｙ）から外部へと排出される。これにより、配線通路１０に侵入した水分が、小径部１０１への侵入することなく外部へ排出される。なお、大径部１０２に侵入した水分及び溝２０に溜まった水分の少なくとも一部は、エンジンの駆動に伴う熱により蒸発し、配線通路１０の上端側へ向かって進み、本体１００とモールド材１１０との界面の端部（位置Ｘ）から排出される場合もある。   The moisture accumulated in the groove 20 travels in the groove 20 toward the side surface of the main body 100, and is transmitted from an end of the groove 20 to a gap at an interface between the side surface of the main body 100 and the molding material 110. Then, the moisture transmitted to the gap between the side surface of the main body 100 and the molding material 110 is discharged to the outside from the end (position Y) of the interface between the main body 100 and the molding material 110. Thus, the water that has entered the wiring passage 10 is discharged to the outside without entering the small diameter portion 101. At least a part of the water that has entered the large-diameter portion 102 and the water that has accumulated in the groove 20 evaporate due to heat generated when the engine is driven, advance toward the upper end side of the wiring passage 10, and enter the main body 100 and the molding material 110. May be discharged from the end of the interface (position X).

以上のように本実施の形態１の燃料噴射弁１においては、配線通路１０の内壁のモールド材１１０との界面に、周方向に延びる溝２０が形成され、溝２０の端部が本体１００の開口と繋がる。このため、本体１００とモールド材１１０及び接合部材２００との界面に隙間が発生した場合であっても、アクチュエータへの水分の侵入を抑制することができ、耐水性を向上することができる。また、配線通路１０の内壁に形成した溝２０によって水分の侵入を抑制するため、簡易な構成により耐水性を向上することができる。また、既設の製造工程に対して溝２０を形成する工程を追加するのみで、本実施の形態１に係る燃料噴射弁１を製造することができるため、簡易な構成により耐水性を向上することができる。   As described above, in the fuel injection valve 1 of the first embodiment, the groove 20 extending in the circumferential direction is formed at the interface between the inner wall of the wiring passage 10 and the mold material 110, and the end of the groove 20 is Connect with the opening. For this reason, even if a gap is generated at the interface between the main body 100, the molding material 110, and the joining member 200, it is possible to suppress the invasion of moisture into the actuator and improve the water resistance. In addition, the groove 20 formed in the inner wall of the wiring passage 10 suppresses intrusion of moisture, so that the water resistance can be improved with a simple configuration. In addition, the fuel injection valve 1 according to the first embodiment can be manufactured only by adding a process of forming the groove 20 to the existing manufacturing process, so that the water resistance is improved by a simple configuration. Can be.

実施の形態２．
以下、実施の形態２に係る燃料噴射弁１を上記実施の形態１との相違点を中心に説明する。なお、本実施の形態２において、特に記述しない項目については実施の形態１と同様とし、同一の機能や構成については同一の符号を用いて述べることとする。 Embodiment 2 FIG.
Hereinafter, the fuel injection valve 1 according to the second embodiment will be described focusing on differences from the first embodiment. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

図１１は、実施の形態２に係る燃料噴射弁の概略構成を示す要部断面図である。図１２は、実施の形態２に係る燃料噴射弁の本体の要部外形図である。なお、図１２においては、本体１００の配線通路１０が開口する側面の外形を示す。
図１１及び図１２に示すように、本実施の形態２における溝２１は、配線通路１０の大径部１０２に形成されている。即ち、溝２１は、配線通路１０の大径部１０２の内壁とモールド材１１０との界面に、大径部１０２の周方向に延びるように形成され、端部が本体１００の側面の開口と繋がる。また、溝２１の端部は、段差面１０３の下端側の縁部と本体１００の側面の開口との接続部に位置する。即ち、溝２１は、本体１００の側面の開口と繋がる端部が、最も下端に近い位置に形成されている。 FIG. 11 is a main-portion cross-sectional view showing a schematic configuration of the fuel injection valve according to Embodiment 2. FIG. 12 is an external view of a main part of a main body of the fuel injection valve according to the second embodiment. FIG. 12 shows the outer shape of the side surface of the main body 100 where the wiring passage 10 is opened.
As shown in FIGS. 11 and 12, the groove 21 according to the second embodiment is formed in the large-diameter portion 102 of the wiring passage 10. That is, the groove 21 is formed at the interface between the inner wall of the large diameter portion 102 of the wiring passage 10 and the molding material 110 so as to extend in the circumferential direction of the large diameter portion 102, and the end is connected to the opening on the side surface of the main body 100. . The end of the groove 21 is located at a connection portion between the edge on the lower end side of the step surface 103 and the opening on the side surface of the main body 100. That is, the end of the groove 21 connected to the opening on the side surface of the main body 100 is formed at a position closest to the lower end.

このような構成により、本体１００とモールド材１１０との界面に隙間が発生した場合であっても、アクチュエータへの水分の侵入を抑制することができ、耐水性を向上することができる。また、配線通路１０の内壁に形成した溝２１によって水分の侵入を抑制するため、簡易な構成により耐水性を向上することができる。   With such a configuration, even if a gap is generated at the interface between the main body 100 and the molding material 110, it is possible to suppress the invasion of moisture into the actuator and improve the water resistance. Further, since the intrusion of moisture is suppressed by the groove 21 formed in the inner wall of the wiring passage 10, the water resistance can be improved with a simple configuration.

１ 燃料噴射弁、１０ 配線通路、２０ 溝、２１ 溝、１００ 本体、１０１ 小径部、１０２ 大径部、１０３ 段差面、１１０ モールド材、１２０ 燃料噴射孔、１３０ コネクタ、１４０ 燃料排出用接続口、１５０ 燃料供給用接続口、２００ 接合部材、２１０ 配線。


Reference Signs List 1 fuel injection valve, 10 wiring passage, 20 grooves, 21 grooves, 100 body, 101 small diameter section, 102 large diameter section, 103 step surface, 110 molding material, 120 fuel injection hole, 130 connector, 140 fuel discharge connection port, 150 connection port for fuel supply, 200 joining member, 210 wiring.


Claims (7)

アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁であって、
前記アクチュエータに接続された配線が通る配線通路が形成された本体と、
前記配線通路へ挿入され前記配線通路を塞ぐ閉塞部材と、
を備え、
前記配線通路は、
一端が前記本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、
前記配線通路の内壁の前記閉塞部材との界面に、周方向に延びる溝が形成され、
前記溝の端部が前記開口と繋がり、
前記配線通路は、
前記本体の側面側に形成された大径部と、
前記アクチュエータ側に形成され、前記大径部よりも開口面積が小さい小径部と、
前記大径部と前記小径部と境目である段差面と、を有し、
前記溝は、
前記段差面と前記大径部との接続部に沿って形成された
ことを特徴とする燃料噴射弁。 A fuel injection valve whose fuel injection hole is opened and closed by energizing an actuator,
A main body in which a wiring path through which the wiring connected to the actuator passes is formed,
A blocking member inserted into the wiring passage to close the wiring passage;
With
The wiring passage,
One end opens to the side surface of the main body, and the other end communicates with the actuator disposed on the fuel injection hole side of the opening,
A groove extending in the circumferential direction is formed at an interface of the inner wall of the wiring passage with the closing member,
End of the groove Ri connected with said opening,
The wiring passage,
A large diameter portion formed on a side surface of the main body,
A small-diameter portion formed on the actuator side and having an opening area smaller than the large-diameter portion;
Having a step surface which is a boundary between the large diameter portion and the small diameter portion,
The groove is
A fuel injection valve formed along a connecting portion between the step surface and the large diameter portion . 前記段差面は、
前記本体の中央側から側面へ向かって前記燃料噴射孔側に傾斜し、
前記燃料噴射孔側の縁部が前記開口と繋がる
ことを特徴とする請求項１に記載の燃料噴射弁。 The step surface,
Inclined toward the fuel injection hole side from the center side of the main body toward the side surface,
The fuel injection valve according to claim 1 , wherein an edge on the fuel injection hole side is connected to the opening. アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁であって、
前記アクチュエータに接続された配線が通る配線通路が形成された本体と、
前記配線通路へ挿入され前記配線通路を塞ぐ閉塞部材と、
を備え、
前記配線通路は、
一端が前記本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、
前記配線通路の内壁の前記閉塞部材との界面に、周方向に延びる溝が形成され、
前記溝の端部が前記開口と繋がり、
前記溝は、
前記開口と繋がる端部が、最も前記燃料噴射孔に近い位置に形成された
ことを特徴とする燃料噴射弁。 A fuel injection valve whose fuel injection hole is opened and closed by energizing an actuator,
A main body in which a wiring path through which the wiring connected to the actuator passes is formed,
A blocking member inserted into the wiring passage to close the wiring passage;
With
The wiring passage,
One end opens to the side surface of the main body, and the other end communicates with the actuator disposed on the fuel injection hole side of the opening,
A groove extending in the circumferential direction is formed at an interface between the inner wall of the wiring passage and the closing member,
An end of the groove is connected to the opening,
The groove is
Fuel injection valve end connected with said opening, it characterized most in that the formed at a position closer to the fuel injection hole. 前記閉塞部材は、
前記配線を保持する接合部材と、
前記配線通路の前記開口を覆うモールド材とにより構成された
ことを特徴とする請求項１〜３の何れか一項に記載の燃料噴射弁。 The closing member,
A joining member for holding the wiring,
The fuel injection valve according to any one of claim 1 to 3, characterized in that it is constituted by a molding material covering the opening of the wiring passage. 前記閉塞部材は、樹脂で形成され、
前記本体は、金属で形成されている
ことを特徴とする請求項１〜４の何れか一項に記載の燃料噴射弁。 The closing member is formed of a resin,
The fuel injection valve according to any one of claims 1 to 4 , wherein the main body is formed of metal. アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁の製造方法であって、
一端が本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、前記アクチュエータに接続された配線が通る配線通路であって、前記本体の側面側に設けられる大径部と、前記アクチュエータ側に設けられ前記大径部よりも開口面積が小さい小径部と、前記大径部と前記小径部と境目である段差面と、を有する配線通路を形成する工程と、
前記配線通路の内壁に、周方向に延び、端部が前記開口と繋がる溝であって、前記段差面と前記大径部との接続部に沿うように設けられる溝を形成する工程と、
前記配線通路を塞ぐ閉塞部材を、少なくとも前記配線通路の前記溝まで挿入する工程と、
を有することを特徴とする燃料噴射弁の製造方法。 A method for manufacturing a fuel injection valve in which a fuel injection hole is opened and closed by energizing an actuator,
One end is open to the side surface of the main body, and the other end communicates with the actuator disposed closer to the fuel injection hole than the opening, and is a wiring passage through which a wiring connected to the actuator passes, and a side surface of the main body. A large-diameter portion provided on the side, a small-diameter portion provided on the actuator side and having a smaller opening area than the large-diameter portion, and a step surface which is a boundary between the large-diameter portion and the small-diameter portion. Forming,
Forming a groove extending in the circumferential direction on the inner wall of the wiring passage, the end being a groove connected to the opening, and provided along a connecting portion between the step surface and the large diameter portion ;
A step of inserting a closing member that closes the wiring path, at least up to the groove of the wiring path,
A method for manufacturing a fuel injection valve, comprising: アクチュエータへの通電によって燃料噴射孔が開閉される燃料噴射弁の製造方法であって、
一端が本体の側面に開口し、他端が前記開口よりも前記燃料噴射孔側に配置された前記アクチュエータと連通し、前記アクチュエータに接続された配線が通る配線通路を形成する工程と、
前記配線通路の内壁に、周方向に延び、端部が前記開口と繋がる溝であって、前記開口と繋がる端部が最も噴射孔に近い位置となるように設けられる溝を形成する工程と、
前記配線通路を塞ぐ閉塞部材を、少なくとも前記配線通路の前記溝まで挿入する工程と、
を有することを特徴とする燃料噴射弁の製造方法。 A method for manufacturing a fuel injection valve in which a fuel injection hole is opened and closed by energizing an actuator,
A step of forming a wiring passage through which one end is opened to a side surface of the main body and the other end is communicated with the actuator arranged on the fuel injection hole side of the opening, and a wiring connected to the actuator passes through;
Forming a groove extending in the circumferential direction on the inner wall of the wiring passage, the end being a groove connected to the opening, and the end connected to the opening being provided at a position closest to the injection hole ;
A step of inserting a closing member that closes the wiring path, at least up to the groove of the wiring path,
A method for manufacturing a fuel injection valve, comprising:
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