WO2015190196A1

WO2015190196A1 - Fuel injection valve

Info

Publication number: WO2015190196A1
Application number: PCT/JP2015/063407
Authority: WO
Inventors: 威生三宅; 秀治江原; 清隆小倉; 智飯塚
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2014-06-10
Filing date: 2015-05-11
Publication date: 2015-12-17
Also published as: JPWO2015190196A1; JP6338662B2

Abstract

When diameters of an injection hole cup and an injection hole cup support are reduced, a distance between a welded connection part of the injection hole cup and the injection hole cup support and a valve seat portion or valving element guide portion of the injection hole cup is reduced, and the valve seat portion or valving element guide portion is deformed due to distortion generated at a time of solidification after welding. This is insufficient to maintain shape accuracy. A fuel injection valve according to the present invention has, between a welded fixation part and a valve seat and guide portion of an injection hole cup, such a form that rigidity is reduced with respect to distortion generated at a time of welding. As a result, the valve seat and guide portion of the injection hole cup is prevented from being deformed due to the distortion generated at a time of solidification after the welding, and it is possible to maintain desired accuracy and prevent an increase of leaking fuel and deteriorations of a flow rate and a spray variation.

Description

燃料噴射弁Fuel injection valve

　本発明は、内燃機関に用いられる燃料噴射弁に関し、特に噴孔カップを噴孔カップ支持体に圧入、溶接固定するものに関する。 The present invention relates to a fuel injection valve for use in an internal combustion engine, and more particularly to an injection hole cup that is press-fitted and welded to an injection hole cup support.

　内燃機関には、運転状態に応じた適切な燃料量を燃料噴射弁の噴射時間に変換する演算を行い、燃料を供給する燃料噴射弁を駆動させる燃料噴射制御装置が備えられている。燃料噴射弁は、例えば、可動子が円筒状の可動子とこの可動子の中心部に位置する針弁とを含んで構成されており、中心部に燃料を導く燃料導入孔を有する固定子の端面と可動子の端面との間に隙間が設けられており、この隙間を含む磁気通路に磁束を供給する電磁ソレノイドを備えている。隙間を通る磁束によって可動子の端面と固定子の端面との間に生起された磁気吸引力で可動子を固定子側に引き付けて可動子を駆動し、針弁の弁体を弁座から引き離して弁座に設けた燃料通路を開くように構成されている。噴射される燃料量は、主に燃料の圧力と燃料噴射弁の噴口部の雰囲気圧力との差圧、並びに弁体を開いた状態に維持し、燃料が噴射されている時間により決定される。 The internal combustion engine is provided with a fuel injection control device that performs a calculation to convert an appropriate amount of fuel according to the operating state into an injection time of the fuel injection valve and drives the fuel injection valve that supplies the fuel. The fuel injection valve includes, for example, a mover having a cylindrical mover and a needle valve positioned at the center of the mover, and a stator having a fuel introduction hole for guiding fuel to the center. A gap is provided between the end face and the end face of the mover, and an electromagnetic solenoid that supplies magnetic flux to a magnetic path including the gap is provided. The mover is driven by the magnetic attraction generated between the end face of the mover and the end face of the stator by the magnetic flux passing through the gap to drive the mover, and the needle valve disc is pulled away from the valve seat. The fuel passage provided in the valve seat is configured to open. The amount of fuel to be injected is determined mainly by the pressure difference between the fuel pressure and the atmospheric pressure at the injection port of the fuel injection valve, and the time during which fuel is injected while the valve body is kept open.

　電磁ソレノイドへの通電を停止すると、可動子に作用する磁気吸引力が消失し、弁体を閉鎖方向に付勢する弾性部材の力と、弁体と弁座間を流れる燃料の流速によって生じる圧力降下によって弁体及び可動子は閉鎖方向へと移動し、弁体が弁座に着座することで燃料通路を閉じる。弁体と弁座の当接により燃料がシールされ、意図しないタイミングで燃料が燃料噴射弁から漏れ出ることを防いでいる。 When energization of the electromagnetic solenoid is stopped, the magnetic attractive force acting on the mover disappears, and the pressure drop caused by the force of the elastic member that urges the valve body in the closing direction and the flow rate of the fuel flowing between the valve body and the valve seat As a result, the valve body and the mover move in the closing direction, and the valve body is seated on the valve seat to close the fuel passage. The fuel is sealed by the contact between the valve body and the valve seat, and the fuel is prevented from leaking from the fuel injection valve at an unintended timing.

　近年、燃料消費量低減という観点から、過給機と組み合わせて内燃機関の排気量を小さくし、熱効率の良い運転領域を使用することで車両搭載時の燃料消費量を低減させる試みが実施されている。排気量と燃料消費量の低減要求に伴い、内燃機関には小型、軽量化が要求され、それに伴い内燃機関に搭載される燃料噴射弁の小型化が必要となっている。 In recent years, from the viewpoint of reducing fuel consumption, attempts have been made to reduce the amount of fuel consumed when a vehicle is mounted by reducing the displacement of an internal combustion engine in combination with a supercharger and using a heat-efficient operating region. Yes. Along with demands for reducing the amount of exhaust and fuel consumption, internal combustion engines are required to be smaller and lighter, and accordingly, fuel injection valves mounted on the internal combustion engines are required to be smaller.

　一方で、内燃機関の排出ガスに含まれる成分を一層低減することも求められており、極微量の漏れ燃料がある場合、内燃機関の停止中であっても燃料噴射弁に接続された燃料レールに残存する燃料が内燃機関内部のピストンとシリンダから構成される燃焼室に供給、蓄積され、次回内燃機関始動時に未燃燃料成分として排出される。近年の法規制値は、このような未燃燃料成分が排気ガスとして排出されると満足できないレベルにまで厳格化されている。燃料噴射弁には製品寿命に渡って漏れ燃料を限りなくゼロにすることが要求されており、燃料噴射弁先端からの燃料の漏れ量少なくするために、弁体と弁座が当接する部位は共に例えば1μm以下の形状精度が必要である。 On the other hand, it is also required to further reduce the components contained in the exhaust gas of the internal combustion engine, and when there is a very small amount of leaked fuel, the fuel rail connected to the fuel injection valve even when the internal combustion engine is stopped The remaining fuel is supplied to and accumulated in a combustion chamber composed of a piston and a cylinder inside the internal combustion engine, and is discharged as an unburned fuel component at the next start of the internal combustion engine. The regulation values in recent years have been tightened to such a level that such unburned fuel components cannot be satisfied when exhausted as exhaust gas. Fuel injection valves are required to have zero fuel leakage over the life of the product, and in order to reduce the amount of fuel leakage from the tip of the fuel injection valve, the part where the valve body and valve seat abut is In both cases, for example, a shape accuracy of 1 μm or less is required.

　また排出ガスに含まれるすす成分を低減するという観点から、燃料噴射弁は1回の噴射あたりたとえば2mgといった極微量の燃料を、ある定められた燃料噴霧形状で精度良く噴射することが要求されている。弁体のスムースかつばらつきの少ない動きを実現するために、弁体と弁座の上流に設けられた弁体を案内する案内部材との隙間は、例えば数μm程しかない。 Also, from the viewpoint of reducing the soot component contained in the exhaust gas, the fuel injection valve is required to accurately inject a very small amount of fuel, for example, 2 mg per injection, in a predetermined fuel spray shape. Yes. In order to realize smooth and little movement of the valve body, the clearance between the valve body and the guide member for guiding the valve body provided upstream of the valve seat is only about several μm, for example.

　燃料噴射弁の弁座と弁体を案内する案内部材は一体化されており、以下噴孔カップと呼称する。噴孔カップは燃料噴射弁を構成する上流側の部品（以下噴孔カップ支持体と呼称する）に圧入後、溶接固定される。 The valve seat of the fuel injection valve and the guide member for guiding the valve body are integrated, and hereinafter referred to as a nozzle hole cup. The injection hole cup is welded and fixed after being press-fitted into an upstream part constituting the fuel injection valve (hereinafter referred to as an injection hole cup support).

　前述の理由から、燃料噴射弁を小型化する必要があり、噴孔カップと噴孔カップ支持体の外径を小さくする必要がある（以下小径化と呼称する）。
　従来の燃料噴射弁の構成を維持したまま、小径化した場合、現行形状のままでは噴孔カップと噴孔カップ支持体の溶接部と、噴孔カップの弁座、弁体案内部との距離が小さくなる。溶接後の凝固時に発生するひずみによって噴孔カップは微小に変形するが、噴孔カップの溶接部と噴孔カップの弁座、弁体案内部の距離が小さくなると変形の影響が大きくなり、前述の精度を維持することができず、漏れ燃料の増加や、流量、噴霧ばらつきが悪化する。 For the above-described reasons, it is necessary to reduce the size of the fuel injection valve, and it is necessary to reduce the outer diameters of the injection hole cup and the injection hole cup support (hereinafter referred to as reduction in diameter).
If the diameter is reduced while maintaining the configuration of the conventional fuel injection valve, the distance between the injection hole cup and the welded part of the injection hole cup support, the valve seat of the injection hole cup, and the valve element guide part with the current shape Becomes smaller. The injection hole cup deforms slightly due to strain generated during solidification after welding, but the effect of deformation increases as the distance between the welded part of the injection hole cup and the valve seat and valve body guide part of the injection hole cup decreases. Accuracy cannot be maintained, and the increase in leaked fuel, the flow rate, and the spray variation are deteriorated.

　従来技術の一例として、特許文献１に開示の燃料噴射弁では、案内部材と、渦流部材と、弁座部材とが互いに素材結合により結合されており、案内部材が渦流部材よりも小さな外径を有しており、該案内部材と該渦流部材との間の前記結合が案内部材の外周の領域で行われている燃料噴射弁が開示されている
　燃料噴射弁が特に簡単な構造で経済的に製造可能である。この場合、噴射弁の、特に下流側の端部が簡単に、それにも拘わらず極めて正確に組立可能である。さらに利点が、案内部材及び弁座部材の面の精密な加工にある。案内部材と渦流部材と弁座部材との、既に噴射弁への組立の前に行われる堅い結合に基づき、案内部材内の案内開口と、弁座部材の弁座面と、案内部材若しくは弁座部材の、最終的に弁ケーシング若しくは弁座支持体と接触することになる接触面とが、一回の緊締（固定）で精密加工、例えば研削（研磨）され得る。 As an example of the prior art, in the fuel injection valve disclosed in Patent Document 1, the guide member, the vortex member, and the valve seat member are coupled to each other by material bonding, and the guide member has a smaller outer diameter than the vortex member. A fuel injection valve is disclosed in which the coupling between the guide member and the swirl member is performed in a region around the outer periphery of the guide member. It can be manufactured. In this case, the end of the injection valve, in particular the downstream side, can be simply and nevertheless very accurately assembled. A further advantage resides in precision machining of the guide member and valve seat member surfaces. The guide opening in the guide member, the valve seat surface of the valve seat member, the guide member or the valve seat is based on the rigid coupling of the guide member, the vortex member and the valve seat member which has already taken place before assembly into the injection valve. The contact surface of the member that will eventually come into contact with the valve casing or the valve seat support can be precision machined, for example ground (polished), with a single clamping.

　別の従来技術の一例として、特許文献２に開示の燃料噴射弁では、燃料噴射孔を有する弁座、燃料に旋回エネルギ－を与えて上記燃料噴射孔に上記燃料を供給する旋回体、上記燃料噴射孔を開閉する弁体、および上記旋回体を経由して上記燃料噴射孔に至る燃料通路を備えた燃料噴射装置であって、上記燃料通路は、上記旋回体を経由して上記燃料噴射孔に至る間に、上記弁座内に設けられた弁座内燃料通路、次いで上記旋回体と上記弁座との間の燃料旋回路を経由するものであることを特徴とするものが開示されている。 As another example of the prior art, in a fuel injection valve disclosed in Patent Document 2, a valve seat having a fuel injection hole, a swivel body that supplies swirling energy to the fuel and supplies the fuel to the fuel injection hole, and the fuel A fuel injection device comprising: a valve body that opens and closes an injection hole; and a fuel passage that reaches the fuel injection hole via the revolving body, wherein the fuel passage passes through the revolving body and the fuel injection hole. The fuel passage in the valve seat provided in the valve seat, and then the fuel turning circuit between the swivel body and the valve seat are disclosed. Yes.

　弁座を冷却するための燃料の一部を溜める燃料溜室を弁座の内部に設け、且つ上記燃料溜室は、前記連通路を介して上記燃料通路と連通しているので、燃料溜室内は常に低温の燃料の流入が可能であるので、弁座はその内部から効果的に冷却され、その結果、エンジンの燃焼熱を直接受ける弁座の燃料噴射孔並びにその近傍の弁座外面も低温度に保持されてカーボンデポジットの発生を抑制する効果がある。 A fuel reservoir chamber for storing a part of the fuel for cooling the valve seat is provided inside the valve seat, and the fuel reservoir chamber communicates with the fuel passage via the communication passage. Since the low temperature fuel can always flow in, the valve seat is effectively cooled from the inside, and as a result, the fuel injection hole of the valve seat directly receiving the combustion heat of the engine and the valve seat outer surface in the vicinity thereof are also low. There is an effect of suppressing the generation of carbon deposits by being held at a temperature.

特開２０１０－２３６５５７号公報JP 2010-236557 A 特開２００６－０２９１５３号公報JP 2006-029153 A

　特許文献１に記載のいずれの実施例の燃料噴射弁においては、弁座部材と弁座支持体と溶接結合されている。よって弁座部材と弁座支持体の直径を小さくする場合、溶接結合部位と噴孔カップの弁座部、または弁体案内部との距離が小さくなり、溶接後の凝固時に発生するひずみによって変形し、前述の精度を維持するには十分ではない。 In any of the fuel injection valves described in Patent Document 1, the valve seat member and the valve seat support are welded to each other. Therefore, when the diameter of the valve seat member and the valve seat support is reduced, the distance between the welded joint and the valve seat portion of the nozzle hole cup or the valve body guide portion is reduced, and deformation occurs due to strain generated during solidification after welding. However, it is not sufficient to maintain the aforementioned accuracy.

　特許文献２に記載のいずれの実施例の燃料噴射弁においては、燃料溜室が存在するため、溶接結合部位と噴孔カップの弁座との間に、剛性低い部位が存在することになる。しかしながら記載の実施例で噴孔カップと噴孔カップ支持体の外径を小さくする場合、同じ強度を維持するためには燃料溜室を縮小せざるを得えず、溶接結合部位と噴孔カップの弁座との間に剛性低い部位が存在しない、あるいは剛性の低下代が小さくなる。よって特許文献２に記載の燃料溜室が存在する場合でも、小径化する際に噴孔カップの弁座の変形を抑制し、前述の精度を維持するには十分ではない。 In the fuel injection valve according to any of the embodiments described in Patent Document 2, a fuel reservoir chamber exists, and therefore, a low rigidity portion exists between the weld joint portion and the valve seat of the injection hole cup. However, when the outer diameters of the injection hole cup and the injection hole cup support are reduced in the described embodiment, the fuel reservoir chamber must be reduced in order to maintain the same strength. There is no portion having low rigidity between the valve seat and the reduction in rigidity is reduced. Therefore, even when the fuel reservoir described in Patent Document 2 is present, it is not sufficient to suppress the deformation of the valve seat of the nozzle hole cup and maintain the aforementioned accuracy when the diameter is reduced.

　上記課題を解決するために、本発明の燃料噴射弁は、前記溶接固定部位と前記噴孔カップの弁座、案内部位との間に、溶接の際に生じるひずみに対して剛性が低下する形状を設けたことを特徴とする燃料噴射弁。 In order to solve the above-described problems, the fuel injection valve of the present invention has a shape in which rigidity is reduced between the weld fixing portion and the valve seat and guide portion of the nozzle hole cup against strain generated during welding. The fuel injection valve characterized by providing.

　燃料噴射弁の噴孔カップ支持体、噴孔カップを小径化し、溶接部と噴孔カップの弁座部、または弁体案内部との距離が小さくなった際にも、溶接後の凝固時に発生するひずみによって、噴孔カップの弁座や案内部が変形を抑制し、所望の精度を維持することができ、漏れ燃料の増加や、流量、噴霧ばらつきの悪化を防止できる。 Occurred during solidification after welding even when the nozzle hole support of the fuel injection valve and the nozzle hole cup are reduced in diameter and the distance between the welded part and the valve seat part of the nozzle hole cup or the valve element guide is reduced. Due to the strain, the valve seat and guide portion of the nozzle hole cup can be prevented from being deformed and desired accuracy can be maintained, and an increase in leaked fuel and deterioration of flow rate and spray variation can be prevented.

従来技術、本発明共通の実施形態による燃料噴射弁の全体断面図である。1 is an overall cross-sectional view of a conventional fuel injection valve according to an embodiment common to the present invention. 従来技術による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by a prior art. 従来技術による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by a prior art. 本発明の実施形態による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by the embodiment of the present invention. 本発明の実施形態による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by the embodiment of the present invention. 本発明の実施形態による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by the embodiment of the present invention. 本発明の実施形態による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by the embodiment of the present invention. 本発明の実施形態による燃料噴射弁の部分拡大断面図である。It is a partial expanded sectional view of the fuel injection valve by the embodiment of the present invention.

　以下、図１から図８を用いて、従来技術による燃料噴射弁と比較して、本発明に係る燃料噴射弁の一実施例の構成について説明する。図１は従来技術、本発明共通の実施形態による燃料噴射弁の縦断面図である。図２から図８は図１の噴孔カップ１１６を中心とした部分拡大図で、本実施例における燃料噴射弁の特徴となる部品に限定し、形状を簡略化して示したものである。図２から図８では動作や機能分かり易くするために部品の大きさや隙間の大きさは実際の比率よりも誇張されており、機能を説明するために不要な部品は省略されている。各実施形態において同一の構成要素には同一の符号が与えられており、重複する説明は省略している。 Hereinafter, the configuration of an embodiment of the fuel injection valve according to the present invention will be described using FIGS. 1 to 8 in comparison with the fuel injection valve according to the prior art. FIG. 1 is a longitudinal sectional view of a conventional fuel injection valve according to an embodiment common to the present invention. 2 to 8 are partial enlarged views centering on the injection hole cup 116 of FIG. 1, and are limited to the parts that are characteristic of the fuel injection valve in the present embodiment, and simplified in shape. In FIG. 2 to FIG. 8, the size of parts and the size of the gap are exaggerated from the actual ratio for easy understanding of the operation and function, and unnecessary parts are omitted to explain the function. In each embodiment, the same constituent elements are given the same reference numerals, and redundant descriptions are omitted.

　図１において、噴孔カップ支持体１０１は直径が小さい小径筒状部２２と直径が大きい大径筒状部２３とを備えている。小径筒状部２２の先端部分の内部に、案内部１１５，燃料噴射孔１１７を備えた噴孔カップ（燃料噴射孔形成部材）１１６が挿入または圧入され、噴孔カップ１１６の先端面の外周の縁部が全周溶接されることにより、小径筒状部２２に固定される。案内部１１５は後述する可動子を構成する針弁１１４Ａの先端に設けられた弁体１１４Ｂが燃料噴射弁の軸方向に上下運動する際に，外周を案内する機能を有する。
噴孔カップ１１６には案内部１１５の下流側に円錐状の弁座３９が形成されている。この弁座３９には針弁１１４Ａの先端に設けた弁体１１４Ｂが当接または離反することで、燃料の流れを遮断したり燃料噴射孔に導いたりする。噴孔カップ支持体１０１の外周には溝が形成されており、この溝に樹脂材製のチップシール１３１に代表される燃焼ガスのシール部材が嵌め込まれている。
噴孔カップ支持体１０１の大径筒状部２３の内周下端部には可動子を構成する針弁１１４Ａをガイドする針弁案内部材１１３が大径筒状部２３の絞り加工部２５に圧入固定されている。針弁案内部材１１３は中央に針弁１１４Ａをその軸方向にガイドする案内部１２７が設けられており、その周囲に複数個の燃料通路１２６が穿孔されている。細長い形状の針弁１１４Ａは針弁案内部材１１３の案内部１２７によって径方向の位置を規定され，かつ軸方向にまっすぐに往復運動するようガイドされる。なお、開弁方向は弁軸方向の上，閉弁方向は弁軸方向の下に向かう方向である。 In FIG. 1, the nozzle hole cup support 101 includes a small diameter cylindrical portion 22 having a small diameter and a large diameter cylindrical portion 23 having a large diameter. An injection hole cup (fuel injection hole forming member) 116 having a guide part 115 and a fuel injection hole 117 is inserted or press-fitted into the distal end portion of the small-diameter cylindrical part 22, and the outer periphery of the front end surface of the injection hole cup 116 is The edge is fixed to the small-diameter cylindrical portion 22 by being welded all around. The guide portion 115 has a function of guiding the outer periphery when a valve body 114B provided at the tip of a needle valve 114A constituting a mover described later moves up and down in the axial direction of the fuel injection valve.
A conical valve seat 39 is formed in the nozzle hole cup 116 on the downstream side of the guide portion 115. A valve body 114B provided at the tip of the needle valve 114A contacts or separates from the valve seat 39, thereby blocking the flow of fuel or guiding it to the fuel injection hole. A groove is formed on the outer periphery of the nozzle hole cup support 101, and a combustion gas seal member typified by a resin-made chip seal 131 is fitted into the groove.
A needle valve guide member 113 that guides a needle valve 114A that constitutes a mover is press-fitted into the drawing portion 25 of the large-diameter cylindrical portion 23 at the inner peripheral lower end of the large-diameter cylindrical portion 23 of the nozzle hole cup support 101. It is fixed. The needle valve guide member 113 is provided with a guide portion 127 for guiding the needle valve 114A in the axial direction at the center, and a plurality of fuel passages 126 are perforated around the guide portion. The elongated needle valve 114A has a radial position defined by the guide portion 127 of the needle valve guide member 113, and is guided to reciprocate straight in the axial direction. The valve opening direction is an upward direction of the valve axis, and the valve closing direction is a direction downward of the valve axis direction.

　針弁１１４Ａの弁体１１４Ｂが設けられている端部とは反対の端部には針弁１１４Ａの直径より大きい外径を有する段付き部１２９を有する頭部１１４Ｃが設けられている。段付き部１２９の上端面には針弁１１４Ａを閉弁方向に付勢するスプリング１１０の着座面が設けられており、頭部１１４Cと併せてスプリング１１０を保持する。 A head 114C having a stepped portion 129 having an outer diameter larger than the diameter of the needle valve 114A is provided at the end opposite to the end where the valve body 114B of the needle valve 114A is provided. The upper end surface of the stepped portion 129 is provided with a seating surface of a spring 110 that urges the needle valve 114A in the valve closing direction, and holds the spring 110 together with the head portion 114C.

　可動子は針弁１１４Ａが貫通する貫通孔１２８を中央に備えた可動子１０２を有する。可動子１０２と針弁案内部材１１３との間に可動子１０２を開弁方向に付勢するゼロスプリング１１２が保持されている。 The mover has a mover 102 with a through hole 128 through which the needle valve 114A passes. A zero spring 112 that biases the mover 102 in the valve opening direction is held between the mover 102 and the needle valve guide member 113.

　頭部１１４Ｃの段付き部１２９の直径より貫通孔１２８の直径の方が小さいので、針弁１１４Ａを噴孔カップ１１６の弁座に向かって押付けるスプリング１１０の付勢力もしくは重力の作用下においては、ゼロスプリング１１２によって保持された可動子１０２の上側面と針弁１１４Ａの段付き部１２９の下端面が当接し、両者は係合している。これによりゼロスプリング１１２の付勢力もしくは重力に逆らう上方への可動子１０２の動きあるいは、ゼロスプリング１１２の付勢力もしくは重力に沿った下方への針弁１１４Ａの動きに対して両者は協働して動くことにな
る。しかし、ゼロスプリング１１２の付勢力もしくは重力に関係なく針弁１１４Ａを上方へ動かす力、あるいは可動子１０２を下方へ動かす力が独立して両者に作用したとき、両者は別々の方向に動くことができる。 Since the diameter of the through hole 128 is smaller than the diameter of the stepped portion 129 of the head portion 114C, under the biasing force of the spring 110 or the action of gravity that presses the needle valve 114A toward the valve seat of the nozzle hole cup 116. The upper surface of the movable element 102 held by the zero spring 112 is in contact with the lower end surface of the stepped portion 129 of the needle valve 114A, and both are engaged. As a result, the two cooperate in response to the upward movement of the mover 102 against the urging force or gravity of the zero spring 112 or the downward movement of the needle valve 114A along the urging force of the zero spring 112 or gravity. It will move. However, when the force for moving the needle valve 114A upward or the force for moving the mover 102 downward acts independently of each other regardless of the biasing force or gravity of the zero spring 112, they may move in different directions. it can.

　噴孔カップ支持体１０１の大径筒状部２３の内周部には固定コア１０７が圧入され、圧入接触位置で溶接接合されている。この溶接接合により噴孔カップ支持体１０１の大径筒状部２３の内部と外気との間に形成される隙間が密閉される。固定コア１０７は中心に針弁１１４Ａの段付き部１２９の直径よりわずかに大きい直径の貫通孔１０７Ｄが燃料導入通路として設けられている。 The fixed core 107 is press-fitted into the inner peripheral portion of the large-diameter cylindrical portion 23 of the nozzle hole cup support 101 and is welded and joined at the press-fit contact position. A gap formed between the inside of the large-diameter cylindrical portion 23 of the nozzle hole cup support 101 and the outside air is sealed by this welding joint. In the center of the fixed core 107, a through hole 107D having a diameter slightly larger than the diameter of the stepped portion 129 of the needle valve 114A is provided as a fuel introduction passage.

　固定コア１０７の下端面や、可動子１０２の上端面及び衝突端面にはメッキを施して耐久性を向上させることがある。可動子に比較的軟らかい軟磁性ステンレス鋼を用いた場合においても、硬質クロムメッキや無電解ニッケルメッキを用いることで、耐久信頼性を確保することができる。 In some cases, the lower end surface of the fixed core 107, the upper end surface of the movable element 102, and the collision end surface are plated to improve durability. Even when relatively soft soft magnetic stainless steel is used for the mover, durability reliability can be ensured by using hard chrome plating or electroless nickel plating.

針弁１１４Ａの頭部１１４Ｃに設けられた段付き部１２９の上端面に形成されたスプリング受け面には初期荷重設定用のスプリング１１０の下端が当接しており、スプリング１１０の他端が固定コア１０７の貫通孔１０７Ｄの内部に圧入される調整子５４で受け止められることで、スプリング１１０が頭部１１４Ｃと調整子５４の間に保持されている。調整子５４の固定位置を調整することでスプリング１１０が針弁１１４Ａを弁座３９に押付ける初期荷重を調整することができる。 The lower end of the spring 110 for setting the initial load is in contact with the spring receiving surface formed on the upper end surface of the stepped portion 129 provided on the head portion 114C of the needle valve 114A, and the other end of the spring 110 is the fixed core. The spring 110 is held between the head 114 C and the adjuster 54 by being received by the adjuster 54 press-fitted into the through hole 107 D of the 107. By adjusting the fixing position of the adjuster 54, the initial load with which the spring 110 presses the needle valve 114A against the valve seat 39 can be adjusted.

　噴孔カップ支持体１０１の大径筒状部２３の外周にはカップ状のハウジング１０３が固定されている。ハウジング１０３の底部には中央に貫通孔が設けられており、貫通孔には噴孔カップ支持体１０１の大径筒状部２３が挿通されている。ハウジング１０３の外周壁の部分は噴孔カップ支持体１０１の大径筒状部２３の外周面に対面する外周ヨーク部を形成している。ハウジング１０３によって形成される筒状空間内には環状を成すように巻回された電磁コイル１０５が配置されている。コイル１０５は半径方向外側に向かって開口する断面がＵ字状の溝を持つ環状のコイルボビン１０４と、この溝の中に巻きつけられた銅線で形成される。コイル１０５の巻き始め，巻き終わり端部には剛性のある導体１０９が固定されており、固定コア１０７に設けた貫通孔より引き出されている。この導体１０９と固定コア１０７，噴孔カップ支持体１０１の大径筒部２３の外周はハウジング１０３の上端開口部内周から絶縁樹脂を注入して、モールド成形され、樹脂成形体１２１で覆われる。かくして、電磁コイル（１０４，１０５）の周りにトロイダル状の磁気通路が形成される。 A cup-shaped housing 103 is fixed to the outer periphery of the large-diameter cylindrical portion 23 of the nozzle hole cup support 101. A through hole is provided at the center of the bottom of the housing 103, and the large-diameter cylindrical portion 23 of the nozzle hole cup support 101 is inserted through the through hole. A portion of the outer peripheral wall of the housing 103 forms an outer peripheral yoke portion facing the outer peripheral surface of the large-diameter cylindrical portion 23 of the nozzle hole cup support 101. An electromagnetic coil 105 wound in an annular shape is arranged in a cylindrical space formed by the housing 103. The coil 105 is formed of an annular coil bobbin 104 having a U-shaped groove that opens radially outward, and a copper wire wound in the groove. A rigid conductor 109 is fixed to the winding start and winding end of the coil 105 and is drawn out from a through hole provided in the fixed core 107. The outer periphery of the large diameter cylindrical portion 23 of the conductor 109, the fixed core 107, and the nozzle hole cup support body 101 is molded by injecting an insulating resin from the inner periphery of the upper end opening of the housing 103, and is covered with the resin molded body 121. Thus, a toroidal magnetic path is formed around the electromagnetic coils (104, 105).

導体１０９の先端部に形成されたコネクタ４３Ａには高電圧電源、バッテリ電源より電力を供給するプラグが接続され、図示しないコントローラによって通電，非通電が制御される。コイル１０５に通電中は、磁気回路１４０を通る磁束によって磁気吸引ギャップにおいて可動子１１４の可動子１０２と固定コア１０７との間に磁気吸引力が発生し、可動子１０２がスプリング１１０の設定荷重を超える力で吸引されることで上方へ動く。このとき可動子１０２は針弁の頭部１１４Ｃと係合して、針弁１１４Ａと一緒に上方へ移動し、可動子１０２の上端面が固定コア１０７の下端面に衝突するまで移動する。その結果、針弁１１４Ａの先端の弁体１１４Ｂが弁座３９より離間し、燃料が燃料通路１１８を通り、噴孔カップ１１６先端にある噴射孔１１７から内燃機関の燃焼室内に噴出する。 A plug for supplying power from a high-voltage power source and a battery power source is connected to the connector 43A formed at the tip of the conductor 109, and energization and de-energization are controlled by a controller (not shown). While the coil 105 is energized, a magnetic attractive force is generated between the movable element 102 of the movable element 114 and the fixed core 107 in the magnetic attractive gap by the magnetic flux passing through the magnetic circuit 140, and the movable element 102 applies the set load of the spring 110. It moves upward by being sucked with a force exceeding it. At this time, the mover 102 engages with the needle valve head 114 C, moves upward together with the needle valve 114 A, and moves until the upper end surface of the mover 102 collides with the lower end surface of the fixed core 107. As a result, the valve body 114B at the tip of the needle valve 114A is separated from the valve seat 39, and the fuel passes through the fuel passage 118 and is ejected from the injection hole 117 at the tip of the injection hole cup 116 into the combustion chamber of the internal combustion engine.

　針弁１１４Ａの先端の弁体１１４Ｂが弁座３９より離間し、上方に引き上げられている間、細長い形状の針弁１１４Ａは針弁案内部材１１３の案内部１２７と，噴孔カップ１１６の案内部１１５の２箇所によって弁軸方向に沿ってまっすぐに復動するようガイドされる。 While the valve body 114B at the tip of the needle valve 114A is separated from the valve seat 39 and pulled upward, the elongated needle valve 114A has a guide portion 127 of the needle valve guide member 113 and a guide portion of the nozzle hole cup 116. It is guided by the two portions 115 so as to return straight along the valve shaft direction.

電磁コイル１０５への通電が断たれると、磁束が消滅し、磁気吸引ギャップにおける磁気吸引力も消滅する。この状態では、針弁１１４Ａの頭部１１４Ｃを反対方向に押す初期荷重設定用のスプリング１１０のばね力がゼロスプリング１１２の力に打ち勝って可動子１１４全体（可動子１０２，針弁１１４Ａ）に作用する。その結果、可動子１０２はスプリング１１０のばね力によって、弁体１１４Ｂが弁座３９に接触する閉弁位置に押し戻される。 When the energization of the electromagnetic coil 105 is cut off, the magnetic flux disappears and the magnetic attractive force in the magnetic attractive gap also disappears. In this state, the spring force of the initial load setting spring 110 that pushes the head portion 114C of the needle valve 114A in the opposite direction overcomes the force of the zero spring 112 and acts on the entire mover 114 (movable element 102, needle valve 114A). To do. As a result, the movable element 102 is pushed back to the valve closing position where the valve body 114 B contacts the valve seat 39 by the spring force of the spring 110.

　針弁１１４Ａの先端の弁体１１４Ｂが弁座３９に接触し閉弁位置にある間、細長い形状の針弁１１４Ａは針弁案内部材１１３の案内部１２７のみによりガイドされており，噴孔カップ１１６の案内部１１５とは接触していない。 While the valve body 114B at the tip of the needle valve 114A is in contact with the valve seat 39 and is in the closed position, the elongated needle valve 114A is guided only by the guide portion 127 of the needle valve guide member 113, and the injection hole cup 116 It is not in contact with the guide part 115.

　このとき、頭部１１４Ｃの段付き部１２９が可動子１０２の上面に当接して可動子１０２を、ゼロスプリング１１２の力に打ち勝って針弁案内部材１１３側へ移動させる。弁体１１４Ｂが弁座３９に衝突すると、可動子１０２は針弁１１４Ａと別体であるため、慣性力によって針弁案内部材１１３方向への移動を継続する。このとき針弁１１４Ａの外周と可動子１０２の内周との間に流体による摩擦が発生し、弁座３９から再度開弁方向に跳ね返る針弁１１４Ａのエネルギが吸収される。慣性質量の大きな可動子１０２が針弁１１４Ａから切り離されているので、跳ね返りエネルギ自体も小さくなる。また、針弁１１４Ａの跳ね返りエネルギを吸収した可動子１０２は自らの慣性力がその分だけ減少し、ゼロスプリング１１２を圧縮した後に受ける反発力も小さくなるため、可動子１０２自体の跳ね返り現象によって針弁１１４Ａが開弁方向に再び動かされる現象は発生し難くなる。かくして、針弁１１４Ａの跳ね返りは最小限に抑えられ、電磁コイル（１０４，１０５）への通電が断たれた後に弁が開いて、燃料が不作為に噴射される、いわゆる二次噴射現象が抑制される。 At this time, the stepped portion 129 of the head portion 114C comes into contact with the upper surface of the movable element 102 and moves the movable element 102 to the needle valve guide member 113 side by overcoming the force of the zero spring 112. When the valve body 114B collides with the valve seat 39, the mover 102 is separate from the needle valve 114A, and therefore continues to move in the direction of the needle valve guide member 113 due to inertial force. At this time, friction due to fluid is generated between the outer periphery of the needle valve 114A and the inner periphery of the movable element 102, and the energy of the needle valve 114A that rebounds from the valve seat 39 in the valve opening direction is absorbed. Since the movable element 102 having a large inertial mass is separated from the needle valve 114A, the rebound energy itself is reduced. Further, since the inertial force of the movable element 102 that has absorbed the rebound energy of the needle valve 114A is reduced by that amount and the repulsive force received after the zero spring 112 is compressed is also reduced, the needle valve is caused by the rebounding phenomenon of the movable element 102 itself. The phenomenon that 114A is moved again in the valve opening direction is less likely to occur. Thus, the rebound of the needle valve 114A is minimized, so that the so-called secondary injection phenomenon in which the valve is opened after the energization of the electromagnetic coils (104, 105) is cut off and the fuel is randomly injected is suppressed. The

　図２は図１に記載の従来技術の燃料噴射弁の噴孔カップ１１６近傍を拡大した断面図である。噴孔カップは噴孔カップ支持体２２に圧入され、燃料噴射弁の軸方向、図２に示す下方向２１１からレーザで噴孔カップ１１６と噴孔カップ支持体２２の縁部を照射され、溶接継ぎ目２０１が形成される。レーザ照射中に噴孔カップ１１６と噴孔カップ支持体２２の縁部の金属は融解し、照射後に凝固するが、金属組織の変化によりひずみが発生する。燃料噴射弁の軸方向、図２に示す下方向２１１からレーザを照射し溶接する場合、噴孔カップにおける主な変形方向は図に示す矢印２０２の向きになる。従来技術の燃料噴射弁の噴孔カップ支持体２２の直径Dであれば、この変形が噴孔カップの弁座３９、あるいは
案内部１１５に与える変形量は目標とする精度に比べて小さく、燃料噴射弁の先端からの漏れ量や噴射量、噴霧のばらつきに与える影響は無視できるものであった。 FIG. 2 is an enlarged sectional view of the vicinity of the injection hole cup 116 of the conventional fuel injection valve shown in FIG. The injection hole cup is press-fitted into the injection hole cup support 22, and the edge of the injection hole cup 116 and the injection hole cup support 22 is irradiated with laser from the axial direction of the fuel injection valve, the downward direction 211 shown in FIG. A seam 201 is formed. During laser irradiation, the metal at the edge of the nozzle hole cup 116 and the nozzle hole cup support 22 melts and solidifies after irradiation, but distortion occurs due to changes in the metal structure. When welding by irradiating a laser from the axial direction of the fuel injection valve, the lower direction 211 shown in FIG. 2, the main deformation direction in the nozzle hole cup is the direction of the arrow 202 shown in the drawing. If the diameter D of the injection hole cup support 22 of the fuel injection valve of the prior art is used, the amount of deformation given to the valve seat 39 or the guide part 115 of the injection hole cup is small compared to the target accuracy, and the fuel The influence on the amount of leakage from the tip of the injection valve, the injection amount, and the spray variation was negligible.

　図３は燃料噴射弁の小型化に対応するために、噴孔カップ支持体２２の外径dを図２に示す噴孔カップ支持体２２の外径Dよりも小さくし、従来と同様に噴孔カップ１１６は噴孔カップ支持体２２に圧入され、燃料噴射弁の軸方向、図に示す下方向２１１からレーザで噴孔カップ１１６と噴孔カップ支持体２２の縁部を照射され、溶接継ぎ目２０１が形成された場合である。噴孔カップ１１６における主な変形方向は図３に示す矢印２０２の向きになる。噴孔カップ支持体２２の直径ｄは図２に示す噴孔カップ支持体２２の直径Dよりも小さいため、噴孔カップ１１６の直径も小さくなり、溶接継ぎ目２０１と噴孔カップの弁座３９、案内部１１５との距離が小さい。よって溶接継ぎ目２０１のひずみが噴孔カップの弁座３９、案内部１１５与える変形量は図２に示す従来の燃料噴射弁よりも大きくなり、燃料噴射弁の先端からの漏れ量や噴射量、噴霧のばらつきに与える影響が無視できなくなる。 In FIG. 3, in order to cope with the downsizing of the fuel injection valve, the outer diameter d of the nozzle hole cup support 22 is made smaller than the outer diameter D of the nozzle hole cup support 22 shown in FIG. The hole cup 116 is press-fitted into the injection hole cup support 22, and the edge of the injection hole cup 116 and the injection hole cup support 22 is irradiated with a laser from the axial direction of the fuel injection valve, the downward direction 211 shown in the figure, and the weld seam. This is a case where 201 is formed. The main deformation direction in the nozzle hole cup 116 is the direction of the arrow 202 shown in FIG. Since the diameter d of the injection hole cup support 22 is smaller than the diameter D of the injection hole cup support 22 shown in FIG. 2, the diameter of the injection hole cup 116 is also reduced, and the weld seam 201 and the valve seat 39 of the injection hole cup, The distance from the guide unit 115 is small. Therefore, the deformation amount given by the weld seam 201 to the valve seat 39 and the guide portion 115 of the nozzle hole cup is larger than that of the conventional fuel injection valve shown in FIG. The influence on the variation of the can not be ignored.

　以下、本発明の特徴について実施例を用いて説明する。 Hereinafter, the features of the present invention will be described using examples.

　図４は本発明の実施形態の一例である。図２、３とは異なり、噴孔カップ１１６と噴孔カップ支持体２２の圧入部位２０５が噴孔カップ支持体２２の案内部１１５よりも燃料噴射弁の上流（図４の上方）に位置し、レーザを燃料噴射弁の軸線とは直角方向２０７から入射させ溶接する。溶接によって発生する溶接継ぎ目は２０３のような形状となり、主なひずみの方向は図に示す矢印２０４の方向となる。本構成であれば、噴孔カップ支持体２２の直径をｄへ小さくした場合でも、溶接継ぎ目は２０３と噴孔カップ１１６の案内部位１１５や弁座３９との間の距離を大きくすることができ、溶接のひずみによる変形の影響を小さくすることができる。さらに溶接継ぎ目２０３と噴孔カップ１１６の案内部位１１５の間の内径を一部拡大し、薄肉部部位２０６を形成することで、剛性を低下させ、噴孔カップ１１６の案内部位１１５、弁座３９へ伝わる変形をさらに低減することが可能である。 FIG. 4 is an example of an embodiment of the present invention. 2 and 3, the injection hole cup 116 and the press-fitting portion 205 of the injection hole cup support 22 are located upstream of the fuel injection valve (upward in FIG. 4) from the guide portion 115 of the injection hole cup support 22. The laser beam is incident from a direction 207 perpendicular to the axis of the fuel injection valve and welded. The weld seam generated by welding has a shape 203, and the main strain direction is the direction of the arrow 204 shown in the figure. With this configuration, even when the diameter of the injection hole cup support 22 is reduced to d, the weld seam can increase the distance between the guide part 115 of the injection hole cup 116 and the valve seat 39. The influence of deformation due to welding distortion can be reduced. Further, the inner diameter between the weld seam 203 and the guide part 115 of the nozzle hole cup 116 is partially enlarged to form a thin part 206, thereby reducing the rigidity, and the guide part 115 of the nozzle hole cup 116 and the valve seat 39. It is possible to further reduce the deformation transmitted to.

　図５は本発明のひとつの実施形態である。図２、３とは異なり、噴孔カップ１１６と噴孔カップ支持体２２の圧入部位２０５が噴孔カップ支持体２２の案内部１１５よりも燃料噴射弁の上流（図４の上方）に位置し、レーザを燃料噴射弁の軸線とは直角方向２０７から入射させ溶接する。溶接によって発生する溶接継ぎ目は２０３のような形状となり、主なひずみの方向は図に示す矢印２０４の方向となる。本構成であれば、噴孔カップ支持体２２の直径をｄへ小さくした場合でも、溶接継ぎ目は２０３と噴孔カップ１１６の案内部位１１５や弁座３９との間の距離を大きくすることができ、溶接のひずみによる変形の影響を小さくすることができる。さらに溶接継ぎ目２０３と噴孔カップ１１６の案内部位１１５の間の外径ｄ１を噴孔カップ１１６と噴孔カップ支持体２２の圧入部位２０５よりも縮小することで、剛性を低下させ、噴孔カップ１１６の案内部位１１５、弁座３９へ伝わる変形をさらに低減することが可能である。 FIG. 5 shows an embodiment of the present invention. 2 and 3, the injection hole cup 116 and the press-fitting portion 205 of the injection hole cup support 22 are located upstream of the fuel injection valve (upward in FIG. 4) from the guide portion 115 of the injection hole cup support 22. The laser beam is incident from a direction 207 perpendicular to the axis of the fuel injection valve and welded. The weld seam generated by welding has a shape 203, and the main strain direction is the direction of the arrow 204 shown in the figure. With this configuration, even when the diameter of the injection hole cup support 22 is reduced to d, the weld seam can increase the distance between the guide part 115 of the injection hole cup 116 and the valve seat 39. The influence of deformation due to welding distortion can be reduced. Further, the outer diameter d1 between the weld seam 203 and the guide part 115 of the nozzle hole cup 116 is reduced more than the press-fitting part 205 of the nozzle hole cup 116 and the nozzle hole cup support body 22, thereby reducing the rigidity and reducing the nozzle hole cup. The deformation transmitted to the guide portion 115 and the valve seat 39 of 116 can be further reduced.

　図６は本発明のひとつの実施形態である。図２、３とは異なり、噴孔カップ１１６と噴孔カップ支持体２２の圧入部位２０５が噴孔カップ支持体２２の案内部１１５よりも燃料噴射弁の上流（図４の上方）に位置し、燃料噴射弁の軸方向、図６に示す下方向２１１からレーザで噴孔カップ１１６と噴孔カップ支持体２２の縁部を照射し、溶接継ぎ目２０８を形成する。主なひずみの方向は図に示す矢印２０２の方向となる。本構成であれば、噴孔カップ支持体２２の直径をｄへ小さくした場合でも、溶接継ぎ目２０８と噴孔カップ１１６の案内部位１１５や弁座３９との間の距離を大きくすることができ、溶接のひずみによる変形の影響を小さくすることができる。さらに溶接継ぎ目２０８と噴孔カップ１１６の案内部位１１５の間の外径ｄ１を噴孔カップ１１６と噴孔カップ支持体２２の圧入部位２０５よりも縮小することで、剛性を低下させ、噴孔カップ１１６の案内部位１１５、弁座３９へ伝わる変形をさらに低減することが可能である。 FIG. 6 shows one embodiment of the present invention. 2 and 3, the injection hole cup 116 and the press-fitting portion 205 of the injection hole cup support 22 are located upstream of the fuel injection valve (upward in FIG. 4) from the guide portion 115 of the injection hole cup support 22. Then, the edge of the nozzle hole cup 116 and the nozzle hole cup support 22 is irradiated with a laser from the axial direction of the fuel injection valve, the lower direction 211 shown in FIG. The main strain direction is the direction of the arrow 202 shown in the figure. With this configuration, even when the diameter of the injection hole cup support 22 is reduced to d, the distance between the weld seam 208 and the guide portion 115 of the injection hole cup 116 or the valve seat 39 can be increased. The influence of deformation due to welding distortion can be reduced. Further, the outer diameter d1 between the weld seam 208 and the guide part 115 of the nozzle hole cup 116 is reduced more than the press-fitting part 205 of the nozzle hole cup 116 and the nozzle hole cup support 22, thereby reducing the rigidity. The deformation transmitted to the guide portion 115 and the valve seat 39 of 116 can be further reduced.

　図７は本発明のひとつの実施形態である。噴孔カップ１１６は噴孔カップ支持体２２に圧入され、燃料噴射弁の軸方向、図２に示す下方向からレーザで噴孔カップ１１６と噴孔カップ支持体２２の縁部を照射し、溶接継ぎ目２０１が形成される。噴孔カップ１１６における主な変形方向は図７に示す矢印２０２の向きになる。図２、３とは異なり、溶接継ぎ目２０１と噴孔カップ１１６の案内部１１５、弁座３９との間に隙間２０９が存在するため、噴孔カップ１１６の剛性が低下し、案内部位１１５、弁座３９へ伝わる変形を低減することが可能である。 FIG. 7 shows one embodiment of the present invention. The injection hole cup 116 is press-fitted into the injection hole cup support 22 and irradiates the edge of the injection hole cup 116 and the injection hole cup support 22 with a laser from the axial direction of the fuel injection valve, the downward direction shown in FIG. A seam 201 is formed. The main deformation direction in the nozzle hole cup 116 is the direction of the arrow 202 shown in FIG. Unlike FIGS. 2 and 3, since the gap 209 exists between the weld seam 201 and the guide portion 115 and the valve seat 39 of the nozzle hole cup 116, the rigidity of the nozzle hole cup 116 is reduced, and the guide portion 115, the valve It is possible to reduce the deformation transmitted to the seat 39.

　図８は本発明のひとつの実施形態である。噴孔カップ１１６は噴孔カップ支持体２２に圧入され、燃料噴射弁の軸方向、図に示す下方向２１１からレーザで噴孔カップ１１６と噴孔カップ支持体２２の下に凸となった縁部２１０を照射し、溶接継ぎ目２０１が形成される。本構成であれば、噴孔カップ支持体２２の直径をｄへ小さくした場合でも、溶接継ぎ目２０１と噴孔カップ１１６の案内部位１１５や弁座３９との間の距離を大きくすることができ、溶接のひずみによる変形の影響を小さくすることができる。噴孔カップ１１６における主な変形方向は図７に示す矢印２０２の向きになる。図２、３とは異なり、溶接継ぎ目２０１と噴孔カップ１１６の案内部１１５、弁座３９との間に隙間２０９が存在するため、噴孔カップ１１６の剛性が低下し、案内部位１１５、弁座３９へ伝わる変形をさらに低減することが可能である。 FIG. 8 shows one embodiment of the present invention. The injection hole cup 116 is press-fitted into the injection hole cup support 22, and the edge that protrudes below the injection hole cup 116 and the injection hole cup support 22 with a laser from the axial direction of the fuel injection valve, the downward direction 211 shown in the drawing. The portion 210 is irradiated and a weld seam 201 is formed. With this configuration, even when the diameter of the injection hole cup support 22 is reduced to d, the distance between the weld seam 201 and the guide part 115 of the injection hole cup 116 and the valve seat 39 can be increased. The influence of deformation due to welding distortion can be reduced. The main deformation direction in the nozzle hole cup 116 is the direction of the arrow 202 shown in FIG. Unlike FIGS. 2 and 3, since the gap 209 exists between the weld seam 201 and the guide portion 115 and the valve seat 39 of the nozzle hole cup 116, the rigidity of the nozzle hole cup 116 is reduced, and the guide portion 115, the valve It is possible to further reduce the deformation transmitted to the seat 39.

　公知となっている従来の発明では、弁座部材と弁座支持体の直径を小さくする場合、溶接結合部位と弁座部、または弁体案内部との距離が小さくなり、溶接後の凝固時に発生するひずみによって変形し、精度を維持するには十分ではなかった。本発明は、前記溶接固定部位と前記噴孔カップの弁座、案内部位との間に、溶接の際に生じるひずみに対して剛性が低下する形状を設けた燃料噴射弁の構造を提案するものである。 In the known conventional invention, when the diameter of the valve seat member and the valve seat support is reduced, the distance between the welded joint portion and the valve seat portion or the valve body guide portion is reduced, and at the time of solidification after welding. Deformation was caused by the generated strain and was not sufficient to maintain accuracy. The present invention proposes a structure of a fuel injection valve provided with a shape in which rigidity is reduced with respect to strain generated during welding between the weld fixing part and the valve seat and guide part of the nozzle hole cup. It is.

　以上のように本実施例では、燃料噴射弁の噴孔カップ支持体、弁体カップを小径化し、溶接部と弁座部、または弁体案内部との距離が小さくなった際にも、溶接後の凝固時に発生するひずみによって、弁座や案内部が変形することを防止し、所望の精度を維持することができ、漏れ燃料の増加や、流量、噴霧ばらつきの悪化を防止できる。 As described above, in this embodiment, the injection hole cup support body and the valve body cup of the fuel injection valve are reduced in diameter, and the welding is performed even when the distance between the welded portion and the valve seat portion or the valve body guide portion is reduced. It is possible to prevent the valve seat and the guide portion from being deformed by strain generated during the subsequent solidification, to maintain desired accuracy, and to prevent an increase in fuel leakage and deterioration in flow rate and spray variation.

　なお、本実施例は、前記実施形態に限定されるものではない。また、本実施例の特徴的な機能を損なわない限り、各構成要素は上記構成に限定されるものではない。 In addition, a present Example is not limited to the said embodiment. Moreover, each component is not limited to the said structure unless the characteristic function of a present Example is impaired.

　例として、実施例の中ではレーザを使用して溶接しているが、噴孔カップ１１６と噴孔カップ支持体２２を融解、凝固させて固定する手段であれば本実施例の原理が適用できるため、効果を発揮することができる。 As an example, welding is performed using a laser in the embodiment, but the principle of this embodiment can be applied as long as it is a means for melting and solidifying the nozzle hole cup 116 and the nozzle hole cup support 22. Therefore, the effect can be exhibited.

２２…噴孔カップ支持体小径筒状部
２３…噴孔カップ支持体大径筒状部
３９…弁座
４３A…コネクタ
１０１…噴孔カップ支持体
１０２…可動子
１０３…ハウジング
１０４…ボビン
１０５…ソレノイド
１０７…固定子
１０７D…固定子貫通孔（燃料通路）
１０９…導体
１１０…スプリング
１１２…ゼロスプリング
１１３…肩部
１１４A…弁体
１１４B…弁体先端部
１１４C…スプリングガイド用突起
１１５…案内部位
１１６…噴孔カップ
１１７…燃料噴射孔
１２１…樹脂成形体
１２６…燃料通路
１２８…貫通孔
１３６…隙間
２０１、２０３、２０８…溶接継ぎ目
２０２、２０４…変形方向
２０５…圧入部位
２０６…薄肉部部位
２０７、２１１…溶接方向
２０９…隙間
２１０…凸となった縁部 22 ... Small hole cylindrical portion 23 of injection hole cup support ... Large diameter cylindrical portion 39 of injection hole cup support ... Valve seat 43A ... Connector 101 ... Injection hole cup support 102 ... Movable element 103 ... Housing 104 ... Bobbin 105 ... Solenoid 107: Stator 107D: Stator through hole (fuel passage)
109 ... Conductor 110 ... Spring 112 ... Zero spring 113 ... Shoulder 114A ... Valve body 114B ... Valve body tip 114C ... Spring guide projection 115 ... Guide portion 116 ... Injection hole cup 117 ... Fuel injection hole 121 ... Resin molding 126 ... Fuel passage 128 ... Through hole 136 ...

Gap

201, 203, 208 ...

Weld seam

202, 204 ... Deformation direction 205 ... Press-fitting part 206 ...

Thin wall part

207, 211 ... Welding direction 209 ... Gap 210 ... Convex edge

Claims

　内燃機関の燃焼室に燃料を噴射する噴孔と，燃料の噴射を断続する弁体に当接する弁座が前記噴孔の上流側に設けられ，前記弁座の上流側に前記弁体を案内する案内部が一体となった噴孔カップを備え、前記噴孔カップは噴孔カップ支持体に圧入、溶接固定されている燃料噴射弁において、前記溶接固定部位と前記弁座、案内部位との間に薄肉部位を設けたことを特徴とする燃料噴射弁。 An injection hole for injecting fuel into the combustion chamber of the internal combustion engine and a valve seat that contacts the valve body for intermittent fuel injection are provided upstream of the injection hole, and the valve body is guided upstream of the valve seat. In the fuel injection valve in which the injection hole cup is integrally press-fitted and fixed by welding to the injection hole cup support, the injection hole cup is integrated with the welding fixing portion, the valve seat, and the guide portion. A fuel injection valve characterized in that a thin wall portion is provided therebetween.
　溶接固定部位が案内部位よりも上流にある請求項１に記載の燃料噴射弁において、前記噴孔カップの案内部位と溶接固定部位の間の噴孔カップ支持体の内径を、前記噴孔カップが噴孔カップ支持体に圧入、溶接固定されている部位の内径より拡大し、薄肉部位を形成していることを特徴とする燃料噴射弁。 2. The fuel injection valve according to claim 1, wherein the weld fixing portion is upstream of the guide portion, and the inner diameter of the injection hole cup support between the guide portion of the injection hole cup and the weld fixing portion is determined by the injection hole cup. A fuel injection valve characterized in that it is enlarged from the inner diameter of a portion press-fitted and welded to the nozzle hole cup support to form a thin portion.
　溶接固定部位が案内部位よりも上流にある請求項１に記載の燃料噴射弁において、前記噴孔カップの案内部位と溶接固定部位の間の噴孔カップ支持体の外径を、前記噴孔カップが噴孔カップ支持体に圧入、溶接固定されている部位の外径より縮小し、薄肉部部位を形成していることを特徴とする燃料噴射弁。 2. The fuel injection valve according to claim 1, wherein the weld fixing portion is upstream of the guide portion, and the outer diameter of the injection hole cup support between the guide portion of the injection hole cup and the weld fixing portion is defined as the injection hole cup. Is a fuel injection valve characterized in that it is smaller than the outer diameter of the portion that is press-fitted and welded to the nozzle hole cup support to form a thin portion.
　内燃機関の燃焼室に燃料を噴射する噴孔と，燃料の噴射を断続する弁体に当接する弁座が前記噴孔の上流側に設けられ，前記弁座の上流側に前記弁体を案内する案内部が一体となった噴孔カップを備え、前記噴孔カップは噴孔カップ支持体に圧入、溶接固定され、溶接固定部位が案内部位よりも下流にある燃料噴射弁において、前記溶接固定部位と噴孔カップの弁座、案内部位との間に隙間を形成することを特徴とする燃料噴射弁。 An injection hole for injecting fuel into the combustion chamber of the internal combustion engine and a valve seat that contacts the valve body for intermittent fuel injection are provided upstream of the injection hole, and the valve body is guided upstream of the valve seat. The injection hole cup is press-fitted into the injection hole cup support, welded and fixed, and the weld fixing part is located downstream of the guide part in the fuel injection valve. A fuel injection valve characterized in that a gap is formed between the part and the valve seat and guide part of the nozzle hole cup.
　内燃機関の燃焼室に燃料を噴射する噴孔と，燃料の噴射を断続する弁体に当接する弁座が前記噴孔の上流側に設けられ，前記弁座の上流側に前記弁体を案内する案内部が一体となった噴孔カップを備え、前記噴孔カップは噴孔カップ支持体に圧入、溶接固定され、溶接固定部位が案内部位よりも下流にある燃料噴射弁において、前記噴孔カップと噴孔カップ支持体の溶接固定部位のみを下流方向に突き出したことを特徴とする燃料噴射弁。 An injection hole for injecting fuel into the combustion chamber of the internal combustion engine and a valve seat that contacts the valve body for intermittent fuel injection are provided upstream of the injection hole, and the valve body is guided upstream of the valve seat. In the fuel injection valve in which the injection hole cup is integrally press-fitted and welded to the injection hole cup support, and the weld fixing part is downstream of the guide part. A fuel injection valve characterized in that only a welding fixing portion between a cup and a nozzle hole cup support protrudes in the downstream direction.
　内燃機関の燃焼室に燃料を噴射する燃料噴射装置であって、
　燃料が噴射される噴孔と、
　燃料の噴射を断続する弁体と、
　前記弁体に当接する弁座が前記噴孔の上流側に設けられ、前記弁座の上流側に前記弁体を案内する案内部が一体となった噴孔カップと、
　前記噴孔カップを支持する噴孔カップ支持体と、
　を備え、
　前記噴孔カップは前記噴孔カップ支持体に圧入、溶接固定されており、
　前記溶接固定された部位と前記弁座とが、前記弁体の軸と垂直な平面で重ならない位置にあることを特徴とする燃料噴射装置。 A fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine,
An injection hole through which fuel is injected;
A valve body that intermittently injects fuel;
A valve seat that contacts the valve body is provided on the upstream side of the nozzle hole, and an injection hole cup in which a guide portion that guides the valve body is integrated on the upstream side of the valve seat;
An injection hole cup support for supporting the injection hole cup;
With
The nozzle hole cup is press-fitted and welded to the nozzle hole cup support,
The fuel injection device according to claim 1, wherein the welded portion and the valve seat are positioned so as not to overlap with each other in a plane perpendicular to the axis of the valve body.
　請求項６記載の燃料噴射装置であって、
　前記溶接固定された部位と前記弁座、前記案内部の案内部位との間に薄肉部位を設けたことを特徴とする燃料噴射装置。
　 The fuel injection device according to claim 6,
A fuel injection device, wherein a thin portion is provided between the welded portion and the valve seat and the guide portion of the guide portion.