JP2018105139A - Electromagnetic fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic fuel injection valve of which an injector plate to be joined to the end face of a valve seat member is composed of a press-molded metal plate, for, when a recess press-molded in one face of the injector plate forms a complicated-shape fuel passage, suppressing or reducing the formation amount of sagging on the peripheral face of the fuel passage to enhance the molding accuracy of the fuel passage, thus promoting the atomization of injected fuel.SOLUTION: In an opposite face 36i of an injector plate 36 to a valve seat member 3, a fuel passage FP is recessed for guiding fuel from a valve hole 10 toward a fuel injection hole 43. The opening face of the fuel passage FP is blocked by the valve seat member 3. On an outer surface 36o of the injector plate 36, an upheaval part 41 is formed corresponding to the fuel passage FP. In connection with at least part of an outer peripheral face 41t of the upheaval part 41 or in the vicinity of the outer peripheral face 41t, a recessed part 100 extending along the outer peripheral face 41t is formed in the outer surface 36o of the injector plate 36.SELECTED DRAWING: Figure 2

Description

本発明は、主として内燃機関の燃料供給系に使用される燃料噴射弁に関し、特に、弁座及びその中心部を貫通する弁孔を有する弁座部材と、弁座と協働して弁孔を開閉する弁体と、燃料噴孔を有して弁座部材の外端面に結合されるインジェクタプレートとを備え、弁座部材及びインジェクタプレート間に、弁孔及び燃料噴孔間を連通する燃料通路を設けるようにした電磁式燃料噴射弁に関する。   The present invention relates to a fuel injection valve mainly used in a fuel supply system of an internal combustion engine, and in particular, a valve seat member having a valve seat and a valve hole penetrating through a central portion thereof, and a valve hole in cooperation with the valve seat. A fuel passage that includes a valve body that opens and closes and an injector plate that has a fuel injection hole and is coupled to the outer end surface of the valve seat member, and communicates between the valve hole and the fuel injection hole between the valve seat member and the injector plate The present invention relates to an electromagnetic fuel injection valve.

上記電磁式燃料噴射弁において、弁座部材端面への燃料通路の切削加工を廃止し且つインジェクタプレートの薄肉化及び成形性確保等を図るために、プレス成形された金属板でインジェクタプレートを構成し、そのプレス成形と同時に燃料通路画成用の凹みをインジェクタプレートの一面（即ち弁座部材との対向面）に成形することが知られている（例えば下記特許文献１を参照）。   In the above electromagnetic fuel injection valve, in order to eliminate the cutting process of the fuel passage to the end face of the valve seat member and to reduce the thickness of the injector plate and ensure the formability, the injector plate is constituted by a press-formed metal plate. It is known that a recess for defining a fuel passage is formed on one surface of an injector plate (that is, a surface facing the valve seat member) simultaneously with the press molding (see, for example, Patent Document 1 below).

特開２００５−２０１０８１号公報JP 2005-201081 A

ところでインジェクタプレートの一面にプレス成形により得られる凹みで、複雑形状の燃料通路（例えば弁孔との連通部から放射方向に延びる案内通路と、案内通路に連なる旋回室と）を形成する場合には、燃料通路の周面の、特に凹み開放端側の端部（即ち弁座部材側の端部）にダレと呼ばれる金属変形部が少なからず生じ易くなり、これが燃料通路の成形精度を低下させ、延いては燃料通路内での燃料の円滑な流れを阻害する等の不都合の要因となる。   By the way, when forming a complicatedly shaped fuel passage (for example, a guide passage extending in a radial direction from a communicating portion with a valve hole and a swirl chamber connected to the guide passage) with a depression obtained by press molding on one surface of the injector plate In addition, a metal deformed portion called sagging is likely to occur at the end portion of the peripheral surface of the fuel passage, in particular the end portion on the opening side of the recess (that is, the end portion on the valve seat member side), which reduces the molding accuracy of the fuel passage, As a result, it becomes a cause of inconvenience such as obstructing the smooth flow of fuel in the fuel passage.

本発明は、上記に鑑み提案されたもので、インジェクタプレートをプレス成形しても、上記ダレの生成量を抑制又は低減して上記不都合を回避可能とした電磁式燃料噴射弁を提供することを目的とする。   The present invention has been proposed in view of the above, and it is an object of the present invention to provide an electromagnetic fuel injection valve that can suppress or reduce the amount of sagging generated and avoid the above disadvantages even when an injector plate is press-molded. Objective.

上記目的を達成するために、本発明は、弁座、及び該弁座の中心部を貫通する弁孔を有する弁座部材と、前記弁座と協働して前記弁孔を開閉する弁体と、燃料噴孔を有して前記弁座部材の外端面に結合されるインジェクタプレートとを備え、前記インジェクタプレートが、プレス成形された金属板で構成される電磁式燃料噴射弁において、前記インジェクタプレートの、前記弁座部材との対向面には、前記弁孔から前記燃料噴孔に向けて燃料を案内する燃料通路が凹設されると共に、その燃料通路の、前記弁座部材側の開放面が該弁座部材で塞がれており、前記インジェクタプレートの、前記弁座部材とは反対側の外表面には、前記燃料通路に対応した***部が形成され、前記***部の少なくとも一部の外周面に連ねて、又は該少なくとも一部の外周面の近傍において、前記燃料通路の周方向に沿って延びる凹部が、前記インジェクタプレートの前記外表面に形成されることを第１の特徴とする。   In order to achieve the above object, the present invention provides a valve seat, a valve seat member having a valve hole penetrating through a central portion of the valve seat, and a valve body that opens and closes the valve hole in cooperation with the valve seat. And an injector plate that has a fuel injection hole and is coupled to an outer end surface of the valve seat member, wherein the injector plate is a press-molded metal plate. A surface of the plate facing the valve seat member is recessed with a fuel passage for guiding fuel from the valve hole toward the fuel injection hole, and the fuel passage is opened on the valve seat member side. A surface is closed by the valve seat member, and a protruding portion corresponding to the fuel passage is formed on the outer surface of the injector plate opposite to the valve seat member, and at least one of the protruding portions is formed. Connected to the outer peripheral surface of the part or at least one In the vicinity of the outer peripheral surface of the recess extending along the circumferential direction of the fuel passage, the first being formed in the outer surface of the injector plate.

また本発明は、前記第１の特徴に加えて、前記燃料通路が、前記弁孔との連通部から所定方向に延びる案内通路と、前記案内通路の下流端に接続されて前記弁孔から該案内通路を経て流入した燃料を旋回させ且つ底部に前記燃料噴孔の上流端を開口させた旋回室とを少なくとも有しており、前記凹部は、前記***部の、前記旋回室に対応した***部分の外周面に連ねて、又は該***部分の外周面の近傍において、前記旋回室の周方向に沿って延びることを第２の特徴とする。   According to the present invention, in addition to the first feature, the fuel passage is connected to a guide passage extending in a predetermined direction from a communicating portion with the valve hole, and is connected to a downstream end of the guide passage from the valve hole. A swirl chamber that swirls the fuel that has flowed in through the guide passage and has an upstream end of the fuel injection hole at the bottom, and the concave portion is a bulge of the bulge corresponding to the swirl chamber The second feature is that it extends along the circumferential direction of the swirl chamber in the vicinity of the outer peripheral surface of the portion or in the vicinity of the outer peripheral surface of the raised portion.

また本発明は、前記第１の特徴に加えて、前記燃料通路が、前記弁孔との連通部から所定方向に延びる案内通路と、前記案内通路の下流端に接続されて前記弁孔から該案内通路を経て流入した燃料を旋回させ且つ底部に前記燃料噴孔の上流端を開口させた旋回室とを少なくとも有しており、前記凹部は、前記***部の、前記案内通路に対応した***部分の外周面に連ねて、又は該***部分の外周面の近傍において、前記案内通路の長手方向に沿って延びることを第３の特徴とする。   According to the present invention, in addition to the first feature, the fuel passage is connected to a guide passage extending in a predetermined direction from a communicating portion with the valve hole, and is connected to a downstream end of the guide passage from the valve hole. A swirl chamber that swirls the fuel that has flowed in through the guide passage and that has an upstream end of the fuel injection hole at the bottom, and the concave portion is a raised portion of the raised portion corresponding to the guide passage. A third feature is that it extends along the longitudinal direction of the guide passage in the vicinity of the outer peripheral surface of the portion or in the vicinity of the outer peripheral surface of the raised portion.

また本発明は、第１〜第３の何れかの特徴に加えて、前記凹部の深さは、前記インジェクタプレートの板厚の４０％以下に設定されることを第４の特徴とする。   In addition to any one of the first to third features, the present invention has a fourth feature that the depth of the recess is set to 40% or less of the plate thickness of the injector plate.

本発明の第１の特徴によれば、プレス成形されるインジェクタプレートの、弁座部材との対向面には、弁孔から燃料噴孔に向けて燃料を案内する燃料通路が凹設され、インジェクタプレートの外表面には、燃料通路に対応した***部が形成される電磁式燃料噴射弁において、***部の少なくとも一部の外周面に連ねて、又は少なくとも一部の外周面の近傍において、燃料通路の周方向に沿って延びる凹部が、インジェクタプレートの外表面に形成されるので、プレス成形時には、凹部形成に伴い金属材料の一部が燃料通路の周面の、弁座部材側の端部（即ちダレの発生領域）に寄せられるように流れ易くなる。これにより、燃料通路の周面でのダレの生成量を抑制又は低減できて燃料通路の成形精度が高められるため、燃料通路内での燃料の円滑な流れ確保や噴射燃料の微粒化促進を図る上で有効である。   According to the first feature of the present invention, a fuel passage for guiding fuel from the valve hole toward the fuel injection hole is provided in a concave surface on the surface of the press-molded injector plate facing the valve seat member. In an electromagnetic fuel injection valve in which a raised portion corresponding to the fuel passage is formed on the outer surface of the plate, the fuel is connected to at least a part of the outer peripheral surface of the raised portion or in the vicinity of at least a part of the outer peripheral surface. Since the recess extending along the circumferential direction of the passage is formed on the outer surface of the injector plate, at the time of press molding, a part of the metal material is the end of the peripheral surface of the fuel passage on the valve seat member side as the recess is formed. It becomes easy to flow so as to be close to (that is, the sagging occurrence region). As a result, the amount of sagging generated on the peripheral surface of the fuel passage can be suppressed or reduced, and the molding accuracy of the fuel passage can be increased. Therefore, the smooth flow of fuel in the fuel passage and the atomization of injected fuel are promoted. Effective above.

また第２，第３の各特徴によれば、燃料通路は、弁孔との連通部から所定方向に延びる案内通路と、案内通路の下流端に接続されて燃料を旋回させる旋回室とを有するので、旋回室で通過燃料にスワールを付与して噴射燃料の微粒化促進に寄与することができる。また、このように案内通路及び旋回室を有することで燃料通路が複雑な通路形態となっても、これをインジェクタプレートにプレス成形で容易に且つ精度よく形成可能である。   According to each of the second and third features, the fuel passage has a guide passage extending in a predetermined direction from the communicating portion with the valve hole, and a swirl chamber connected to the downstream end of the guide passage and for turning the fuel. Therefore, a swirl can be given to the passing fuel in the swirl chamber to contribute to the promotion of atomization of the injected fuel. Further, even if the fuel passage has a complicated passage form by having the guide passage and the swirl chamber in this manner, it can be easily and accurately formed on the injector plate by press molding.

また特に第２の特徴によれば、凹部は、***部の、旋回室に対応した***部分の外周面に連ねて、又はその外周面の近傍において、旋回室の周方向に沿って延びるので、プレス成形時には、凹部形成に伴い金属材料の一部が旋回室周面の、弁座部材側の端部に寄せられるように流れ易くなり、これにより、旋回室周面でのダレの生成量を抑制又は低減できて旋回室の成形精度を高めることができる。   In particular, according to the second feature, the concave portion extends along the circumferential direction of the swirl chamber in the vicinity of or in the vicinity of the outer circumferential surface of the raised portion corresponding to the swirl chamber of the raised portion. At the time of press molding, it becomes easier for some of the metal material to flow toward the end of the swirl chamber peripheral surface on the valve seat member side with the formation of the recess, thereby reducing the amount of sagging on the swirl chamber peripheral surface. It can suppress or reduce and can improve the forming accuracy of the swirl chamber.

また特に第３の特徴によれば、凹部は、***部の、案内通路に対応した***部分の外周面に連ねて、又はその外周面の近傍において、案内通路の長手方向に沿って延びる凹部が、インジェクタプレートの外表面に形成されるので、プレス成形時には、凹部形成に伴い金属材料の一部が案内通路の内側面の、弁座部材側の端部に寄せられるように流れ易くなる。これにより、案内通路の内側面でのダレの生成量を抑制又は低減できて、案内通路の成形精度を高めることができる。   In particular, according to the third feature, the concave portion extends along the longitudinal direction of the guide passage in the vicinity of the outer peripheral surface of the raised portion corresponding to the guide passage or in the vicinity of the outer peripheral surface. Since it is formed on the outer surface of the injector plate, at the time of press molding, it becomes easy to flow so that a part of the metal material is brought closer to the end of the inner surface of the guide passage on the valve seat member side as the recess is formed. Thereby, the amount of sagging generated on the inner surface of the guide passage can be suppressed or reduced, and the molding accuracy of the guide passage can be increased.

また本発明の第４の特徴によれば、上記凹部の深さは、インジェクタプレートの板厚の４０％以下に設定されるので、凹部が過度に深くなる虞れはなくなり、従って、凹部が深過ぎることに因るインジェクタプレートのクラック発生を効果的に回避可能となる。   According to the fourth feature of the present invention, since the depth of the recess is set to 40% or less of the thickness of the injector plate, there is no possibility that the recess becomes excessively deep. It is possible to effectively avoid the occurrence of cracks in the injector plate due to the excess.

本発明の一実施形態に係る内燃機関用電磁式燃料噴射弁の縦断面図1 is a longitudinal sectional view of an electromagnetic fuel injection valve for an internal combustion engine according to an embodiment of the present invention. 図１の２矢視部拡大図（図３の２−２線断面図）1 is an enlarged view taken along arrow 2 in FIG. （Ａ）は図２の３Ａ−３Ａ矢視図、（Ｂ）は図２の３Ｂ矢視図(A) is a view taken in the direction of arrows 3A-3A in FIG. 2, and (B) is a view taken in the direction of arrows 3B in FIG. 図３の４−４線断面部分に着目してインジェクタプレートのプレス成形工程の一例を説明した工程説明図であって、（Ａ）はワークを金型にセットした成形直前状態を示し、（Ｂ）はプレス成形直後で離型前の状態を示すIt is process explanatory drawing explaining an example of the press molding process of an injector plate paying attention to the 4-4 line cross-section part of FIG. 3, Comprising: (A) shows the state just before shaping | molding which set the workpiece | work to the metal mold | die, (B ) Indicates the state immediately after press molding and before mold release

本発明の実施形態を、添付図面を参照して、以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

先ず、図１及び図２において、内燃機関用電磁式燃料噴射弁Ｉのケーシング１は、円筒状の弁ハウジング２（磁性体）と、この弁ハウジング２の前端部に液密に結合される有底円筒状の弁座部材３と、弁ハウジング２の後端に環状スペーサ４を挟んで液密に結合される円筒状の固定コア５とから構成される。   First, in FIGS. 1 and 2, a casing 1 of an electromagnetic fuel injection valve I for an internal combustion engine is liquid-tightly coupled to a cylindrical valve housing 2 (magnetic body) and a front end portion of the valve housing 2. The valve seat member 3 has a bottom cylindrical shape, and a cylindrical fixed core 5 that is liquid-tightly coupled to the rear end of the valve housing 2 with an annular spacer 4 interposed therebetween.

環状スペーサ４は、ステンレス鋼等の非磁性金属製であり、その両端面に弁ハウジング２及び固定コア５が突き当てられて液密に全周溶接され、その溶接にはレーザビームが使用される。   The annular spacer 4 is made of a non-magnetic metal such as stainless steel, and the valve housing 2 and the fixed core 5 are abutted against both end surfaces of the annular spacer 4 and are welded in a liquid-tight manner, and a laser beam is used for the welding. .

弁座部材３及び弁ハウジング２の対向端部には、第１嵌合筒部３ａ及び第２嵌合筒部２ａがそれぞれ形成される。そして第１嵌合筒部３ａが第２嵌合筒部２ａ内にストッパプレート６と共に圧入され、ストッパプレート６は、弁ハウジング２と弁座部材３間で挟持される。その後、第１嵌合筒部３ａの外周面と第２嵌合筒部２ａの端面とに挟まれる隅部の全周にわたりレーザ溶接又はビーム溶接を施すことにより、弁ハウジング２及び弁座部材３が相互に液密に結合される。   A first fitting cylinder portion 3a and a second fitting cylinder portion 2a are formed at opposite ends of the valve seat member 3 and the valve housing 2, respectively. And the 1st fitting cylinder part 3a is press-fitted with the stopper plate 6 in the 2nd fitting cylinder part 2a, and the stopper plate 6 is clamped between the valve housing 2 and the valve seat member 3. FIG. Thereafter, by performing laser welding or beam welding over the entire circumference of the corner sandwiched between the outer peripheral surface of the first fitting tube portion 3a and the end surface of the second fitting tube portion 2a, the valve housing 2 and the valve seat member 3 are provided. Are liquid-tightly coupled to each other.

弁座部材３には、それの平坦な前端面即ち外端面に下流端を開口する円錐状の弁座８と、この弁座８の中心部を貫通して弁座部材３の外端面に開口する弁孔１０と、弁座８の上流端、即ち大径部に連なる円筒状のガイド孔９とが設けられており、そのガイド孔９は、前記第２嵌合筒部２ａと同軸状に形成される。   The valve seat member 3 includes a conical valve seat 8 having a downstream end at a flat front end surface, that is, an outer end surface thereof, and an opening at the outer end surface of the valve seat member 3 that passes through a central portion of the valve seat 8. And a cylindrical guide hole 9 connected to the upstream end of the valve seat 8, that is, the large-diameter portion. The guide hole 9 is coaxial with the second fitting cylinder portion 2a. It is formed.

弁ハウジング２及び環状スペーサ４内には、固定コア５の前端面に対向する可動コア１２が摺動自在に収容され、この可動コア１２に、前記ガイド孔９に軸方向摺動自在に収容される弁体１６が一体的に結合される。この弁体１６は、弁座８に着座し得る球状の弁部１６ａと、ガイド孔９に摺動自在に支承される前後一対のジャーナル部１６ｂ，１６ｂと、前記ストッパプレート６に当接して弁体１６の開弁限界を規定するフランジ１６ｃとを一体に備えており、各ジャーナル部１６ｂには、燃料の流通を可能にする複数の平坦面１７，１７…が設けられる。   A movable core 12 facing the front end surface of the fixed core 5 is slidably accommodated in the valve housing 2 and the annular spacer 4. The movable core 12 is accommodated in the guide hole 9 so as to be slidable in the axial direction. The valve body 16 is integrally coupled. The valve body 16 is in contact with the stopper plate 6 in contact with a spherical valve portion 16a that can be seated on the valve seat 8, a pair of front and rear journal portions 16b and 16b that are slidably supported in the guide hole 9. A flange 16c that defines the valve opening limit of the body 16 is integrally provided, and each of the journal portions 16b is provided with a plurality of flat surfaces 17, 17,.

固定コア５は、弁ハウジング２内と連通する中空部２１を有しており、その中空部２１に、可動コア１２を弁体１６の閉じ方向、即ち弁座８への着座方向に付勢するコイル状の弁ばね２２と、この弁ばね２２の後端を支承するパイプ状のリテーナ２３とが収容される。このリテーナ２３は、中空部２１においてカシメにより固定される。   The fixed core 5 has a hollow portion 21 communicating with the inside of the valve housing 2, and the movable core 12 is urged in the hollow portion 21 in the closing direction of the valve body 16, that is, in the seating direction on the valve seat 8. A coiled valve spring 22 and a pipe-shaped retainer 23 that supports the rear end of the valve spring 22 are accommodated. The retainer 23 is fixed by caulking in the hollow portion 21.

固定コア５の後端には、パイプ状のリテーナ２３を介して固定コア５の中空部２１に連通する燃料入口２５ａを持つ入口筒２５が一体に連設され、その燃料入口２５ａに燃料フィルタ２７が装着される。   An inlet cylinder 25 having a fuel inlet 25a communicating with the hollow portion 21 of the fixed core 5 through a pipe-like retainer 23 is integrally connected to the rear end of the fixed core 5, and a fuel filter 27 is connected to the fuel inlet 25a. Is installed.

環状スペーサ４及び固定コア５の外周にはコイル組立体２８が嵌装される。このコイル組立体２８は、環状スペーサ４及び固定コア５に外周面に嵌合するボビン２９と、これに巻装されるコイル３０とからなっており、このコイル組立体２８を囲繞するコイルハウジング３１の一端部が弁ハウジング２の外周面に溶接により結合される。   A coil assembly 28 is fitted on the outer periphery of the annular spacer 4 and the fixed core 5. The coil assembly 28 includes a bobbin 29 fitted to the outer peripheral surface of the annular spacer 4 and the fixed core 5, and a coil 30 wound around the bobbin 29, and a coil housing 31 surrounding the coil assembly 28. Is connected to the outer peripheral surface of the valve housing 2 by welding.

コイルハウジング３１、コイル組立体２８及び固定コア５は合成樹脂製の被覆体３２内に埋封され、この被覆体３２の中間部には、前記コイル３０に連なる接続端子３３を収容する備えたカプラ３４が一体に連設される。   The coil housing 31, the coil assembly 28, and the fixed core 5 are embedded in a cover 32 made of synthetic resin, and a coupler that accommodates a connection terminal 33 connected to the coil 30 in the middle of the cover 32. 34 are continuously provided.

図２に明示するように、弁座部材３の前端面には円板状のインジェクタプレート３６が液密に全周溶接ｗされ、その溶接にはレーザビームが使用される。このインジェクタプレート３６は、金属板（例えば、ステンレス鋼板、その他の鋼板）を所定形状にプレス成形して得られるプレス成形品より構成される。インジェクタプレート３６には、弁孔１０の軸線回りの同一円周上で等間隔おきに並ぶ複数の燃料噴孔４３が穿設される。インジェクタプレート３６は、その板厚が、例えば０．１ｍｍ前後の薄肉の板状である。尚、図面上は、発明を理解し易くするためにインジェクタプレート３６の板厚を多少誇張して描いている。   As clearly shown in FIG. 2, a disc-like injector plate 36 is welded to the front end face of the valve seat member 3 in a liquid-tight manner, and a laser beam is used for the welding. The injector plate 36 is composed of a press-molded product obtained by press-molding a metal plate (for example, a stainless steel plate or other steel plate) into a predetermined shape. The injector plate 36 is provided with a plurality of fuel injection holes 43 arranged at equal intervals on the same circumference around the axis of the valve hole 10. The injector plate 36 is a thin plate having a plate thickness of, for example, about 0.1 mm. In the drawings, the thickness of the injector plate 36 is slightly exaggerated for easy understanding of the invention.

インジェクタプレート３６の上面、即ち弁座部材３外端面との対向面３６ｉには、弁孔１０から燃料噴孔４３に向けて燃料を流動案内する燃料通路ＦＰとなる浅い凹みが、上記プレス成形により形成される。この燃料通路ＦＰは、通過燃料にスワールを付与して燃料噴孔４３からの噴射燃料の微粒化促進に寄与すべく、以下に説明するような複雑な平面形態（本実施形態では花弁状）に形成される。   On the upper surface of the injector plate 36, that is, the surface 36 i facing the outer end surface of the valve seat member 3, a shallow recess serving as a fuel passage FP for guiding the fuel flow from the valve hole 10 toward the fuel injection hole 43 is formed by the press molding. It is formed. The fuel passage FP has a complicated planar shape (a petal shape in the present embodiment) as described below in order to give a swirl to the passing fuel and contribute to the promotion of atomization of the injected fuel from the fuel injection hole 43. It is formed.

即ち、燃料通路ＦＰは、弁孔１０に直接連通する連通部としての中央油室３７と、その中央油室３７からインジェクタプレート３６の板面に沿う所定方向（本実施形態では弁孔１０の中心に対し放射方向）に直線状に延びる複数の案内通路３８と、各案内通路３８の下流端が接線方向に開口する旋回室３９とを備える。その旋回室３９は、案内通路３８の中心線Ｌに対し案内通路３８の幅方向で一方側（換言すればインジェクタプレート３６の周方向で一方側）にオフセット配置される。   That is, the fuel passage FP includes a central oil chamber 37 as a communicating portion directly communicating with the valve hole 10 and a predetermined direction along the plate surface of the injector plate 36 from the central oil chamber 37 (in this embodiment, the center of the valve hole 10). In contrast, a plurality of guide passages 38 extending linearly in the radial direction) and a swirl chamber 39 whose downstream ends open in the tangential direction are provided. The swirl chamber 39 is offset from the center line L of the guide passage 38 in one direction in the width direction of the guide passage 38 (in other words, one side in the circumferential direction of the injector plate 36).

そして、旋回室３９の底面には燃料噴孔４３の上流端が開口している。尚、燃料噴孔４３は、例えばプレス成形後のインジェクタプレート３６に対しドリル加工等で形成される。   The upstream end of the fuel injection hole 43 opens at the bottom surface of the swirl chamber 39. The fuel injection holes 43 are formed by drilling or the like on the injector plate 36 after press molding, for example.

燃料通路ＦＰの大部分（より具体的には中央油室３７の外周部、各案内通路３９及び各旋回室３９）の、弁座部材３側の開放面は、弁座部材３で塞がれる。またインジェクタプレート３６の上面３６ｉの、燃料通路ＦＰを取り囲む領域は、弁座部材３の外端面に密着状態におかれる。そして、燃料通路ＦＰを流れる燃料は、外部に漏れ出すことなく、弁孔１０から中央油室３７、案内通路３８及び旋回室３９を順次経て燃料噴孔４３まで到達する。   An open surface on the valve seat member 3 side of most of the fuel passage FP (more specifically, the outer periphery of the central oil chamber 37, each guide passage 39, and each swirl chamber 39) is closed by the valve seat member 3. . In addition, the region surrounding the fuel passage FP on the upper surface 36 i of the injector plate 36 is in close contact with the outer end surface of the valve seat member 3. The fuel flowing through the fuel passage FP reaches the fuel injection hole 43 from the valve hole 10 through the central oil chamber 37, the guide passage 38, and the swirl chamber 39 in order without leaking outside.

また、旋回室３９の周面は、径方向外方側に凸に彎曲した彎曲周面３９ｆとされ、その彎曲周面３９ｆの旋回案内作用により、案内通路３８を経て旋回室３９に流入した燃料をスムーズに旋回させる。これにより、燃料噴孔４３に流入する直前の燃料にスワールを付与することができる。   Further, the peripheral surface of the swirl chamber 39 is a curved peripheral surface 39f that is bent convex outward in the radial direction, and the fuel that has flowed into the swirl chamber 39 through the guide passage 38 by the swivel guide action of the curved peripheral surface 39f. Rotate smoothly. Thereby, a swirl can be given to the fuel immediately before flowing into the fuel injection hole 43.

一方、案内通路３８の相対向する両内側面、即ち第１，第２内側面３８ｉ，３８ｏは、案内通路３８の長手方向（即ち弁孔１０の中心に対し放射方向）に直線状に延びる。   On the other hand, the opposing inner side surfaces of the guide passage 38, that is, the first and second inner side surfaces 38i, 38o, extend linearly in the longitudinal direction of the guide passage 38 (that is, the radial direction with respect to the center of the valve hole 10).

上記した第１，第２内側面３８ｉ，３８ｏのうち、特に案内通路３８の幅方向で旋回室３９中心部寄り（即ち通路中心線Ｌに対し旋回室３９がオフセット配置される側）に位置する第１内側面３８ｉは、それの下流端と、旋回室３９の彎曲周面３９ｆの下流側終端とが曲面ｒで滑らかに接続される。尚、第１内側面３８ｉの下流端と彎曲周面３９ｆの下流側終端とは、その相互間を例えば曲面ｒを介さずに直接接続させるようにしてもよい。   Of the first and second inner side surfaces 38i and 38o described above, particularly in the width direction of the guide passage 38, it is located near the center of the swirl chamber 39 (that is, on the side where the swirl chamber 39 is offset from the passage center line L). The first inner side surface 38 i is smoothly connected to the downstream end thereof by the curved surface r at the downstream end of the curved peripheral surface 39 f of the swirl chamber 39. The downstream end of the first inner surface 38i and the downstream end of the curved peripheral surface 39f may be directly connected to each other without, for example, the curved surface r.

また、案内通路３８の第２内側面３８ｏの下流端と、旋回室３９の彎曲周面３９ｆの上流側始端とは、段差なく滑らかに接続される。これにより、案内通路３８から旋回室３９へ高圧燃料がスムーズに流入し得るようになっている。   Further, the downstream end of the second inner side surface 38o of the guide passage 38 and the upstream start end of the curved peripheral surface 39f of the swirl chamber 39 are smoothly connected without any step. As a result, the high-pressure fuel can smoothly flow from the guide passage 38 into the swirl chamber 39.

ところでインジェクタプレート３６の下面（即ち弁座部材３とは反対側の外表面）３６ｏには、後述するようにインジェクタプレート３６をプレス成形することで燃料通路ＦＰに対応して***した形状（本実施形態では花弁状）の***部４１が形成される。この***部４１の外周面４１ｔは、***部４１の各部を横切る方向の横断面で見て、***部４１の根元部分から頂面に向かって***部４１の中央寄り、即ち先細り状に傾斜したテーパ面に形成される。   By the way, on the lower surface 36o of the injector plate 36 (that is, the outer surface opposite to the valve seat member 3), as shown later, the injector plate 36 is press-molded so as to rise in correspondence with the fuel passage FP (this embodiment) A raised portion 41 having a petal shape in the form is formed. The outer peripheral surface 41t of the raised portion 41 is inclined toward the center of the raised portion 41 from the root portion of the raised portion 41 toward the top, that is, in a tapered manner, when viewed in a cross section in a direction crossing each portion of the raised portion 41. It is formed on a tapered surface.

そして、インジェクタプレート３６の下面３６ｏには、上記***部４１の少なくとも一部（本実施形態では周方向で全領域）の外周面４１ｔに連ねて、外周面４１ｔに沿って延びる比較的浅い凹部１００が、インジェクタプレート３６のプレス成形と同時に成形されている。   The lower surface 36o of the injector plate 36 is connected to the outer peripheral surface 41t of at least a part of the raised portion 41 (in the present embodiment, the entire region in the circumferential direction) and is a relatively shallow recess 100 extending along the outer peripheral surface 41t. However, it is formed simultaneously with the press forming of the injector plate 36.

より具体的に言えば、例えば***部４１の、旋回室３９に対応した***部分４１Ｓの周辺では、この***部分４１Ｓの外周面４１ｔに連ねて、凹部１００が旋回室３９の周方向に沿って延びるようにインジェクタプレート３６の下面３６ｏに形成される。   More specifically, for example, in the vicinity of the raised portion 41S of the raised portion 41 corresponding to the swirl chamber 39, the concave portion 100 extends along the circumferential direction of the swirl chamber 39 so as to continue to the outer peripheral surface 41t of the raised portion 41S. It is formed on the lower surface 36o of the injector plate 36 so as to extend.

また、***部４１の、案内通路３８に対応した***部分４１Ｇの周辺では、この***部分４１Ｇの外周面４１ｔに連ねて、凹部１００が案内通路３８の長手方向に沿って延びるようにインジェクタプレート３６の外表面３６ｏに形成される。   In the vicinity of the raised portion 41G of the raised portion 41 corresponding to the guide passage 38, the injector plate 36 is connected to the outer peripheral surface 41t of the raised portion 41G so that the recess 100 extends along the longitudinal direction of the guide passage 38. The outer surface 36o is formed.

更に***部４１の、中央油室３７に対応した***部分４１Ｃの周辺では、この***部分４１Ｃの外周面４１ｔに連ねて、凹部１００が中央油室３７の周方向に沿って延びるようにインジェクタプレート３６の外表面３６ｏに形成される。   Further, in the vicinity of the raised portion 41C of the raised portion 41 corresponding to the central oil chamber 37, the injector plate is connected to the outer peripheral surface 41t of the raised portion 41C so that the concave portion 100 extends along the circumferential direction of the central oil chamber 37. 36 is formed on the outer surface 36o.

また上記凹部１００の深さは、例えば、インジェクタプレート３６の板厚の４０％以下に設定されることが望ましい。   The depth of the recess 100 is preferably set to 40% or less of the thickness of the injector plate 36, for example.

次に、前記実施形態の作用について説明する。コイル３０を消磁した状態では、弁ばね２２の付勢力で可動コア１２及び弁体１６が前方に押圧され、弁座８に着座させている。したがって、燃料フィルタ２７及び入口筒２５を通して弁ハウジング２内に供給された高圧燃料は、弁ハウジング２内に待機させられる。   Next, the operation of the embodiment will be described. In a state where the coil 30 is demagnetized, the movable core 12 and the valve body 16 are pressed forward by the urging force of the valve spring 22 and are seated on the valve seat 8. Accordingly, the high-pressure fuel supplied into the valve housing 2 through the fuel filter 27 and the inlet cylinder 25 is made to wait in the valve housing 2.

コイル３０を通電により励磁すると、それにより生ずる磁束が固定コア５、コイルハウジング３１、弁ハウジング２及び可動コア１２を順次走り、その磁力により可動コア１２が弁体１６と共に固定コア５に吸引され、弁体１６が弁座８から離座するので、弁ハウジング２内の高圧燃料は、弁体１６の平坦面１７，１７…、弁座８及び弁孔１０を順次通過して燃料通路ＦＰに移り、その燃料通路ＦＰの中央油室３７から複数の案内通路３８に分岐し、放射状に拡散しながら複数の旋回室３９に達する。   When the coil 30 is excited by energization, the magnetic flux generated by the coil 30 sequentially travels through the fixed core 5, the coil housing 31, the valve housing 2, and the movable core 12, and the movable core 12 is attracted to the fixed core 5 together with the valve body 16 by the magnetic force. Since the valve body 16 is separated from the valve seat 8, the high-pressure fuel in the valve housing 2 sequentially passes through the flat surfaces 17, 17..., The valve seat 8 and the valve hole 10 of the valve body 16 and moves to the fuel passage FP. The fuel passage FP branches from the central oil chamber 37 into a plurality of guide passages 38 and reaches a plurality of swirl chambers 39 while diffusing radially.

このとき、高圧燃料が各案内通路３８から対応する旋回室３９へ高速で接線方向に流入するため、流入燃料は旋回室３９を高速で旋回することでスワールを付与され、しかも案内通路３８を経て旋回室３９に到達するまでの燃料流に急激な屈曲がなく、その流れがスムーズとなるから、燃料の速度損失も少ない。その結果、各旋回室３９の燃料噴孔４３からエンジンの被噴射部位（例えば吸気ポート）に向けて噴射される噴射燃料の微粒化促進が達成されて、良好な噴霧フォームが得られ、しかも燃料噴射の応答性が良好である。これにより、燃焼室内での燃料の燃焼性が高められ、また燃焼制御が精度よく行われる。   At this time, high-pressure fuel flows from each guide passage 38 into the corresponding swirl chamber 39 in a tangential direction at a high speed, so that the inflow fuel is swirled by swirling the swirl chamber 39 at a high speed and passes through the guide passage 38. The fuel flow until reaching the swirl chamber 39 is not sharply bent and the flow becomes smooth, so that the fuel speed loss is small. As a result, atomization of the injected fuel injected from the fuel injection hole 43 of each swirl chamber 39 toward the injection target portion (for example, the intake port) of the engine is promoted, and a good spray foam is obtained. Good responsiveness of injection. Thereby, the combustibility of the fuel in a combustion chamber is improved, and combustion control is performed accurately.

そして、燃料通路ＦＰは、上記のように各複数の案内通路３８及び旋回室３９を有することで、複雑な通路形態となるが、これをインジェクタプレート３６にプレス成形で容易に且つ精度よく形成可能である。   The fuel passage FP has a plurality of guide passages 38 and swirl chambers 39 as described above, and thus has a complicated passage form. This can be easily and accurately formed on the injector plate 36 by press molding. It is.

次に図４を参照してインジェクタプレート３６のプレス成形工程の一例を示す。   Next, an example of the press molding process of the injector plate 36 will be described with reference to FIG.

インジェクタプレート３６の最終製品と同形の円板状に予め加工された金属板よりなるワーク０３６は、図４（Ａ）に示すように、先ずダイ５０上に載置されると共に、パンチガイド５２により外周部を抑えられる。次いで、ワーク０３６は、図４（Ｂ）に示すように、ダイ５０と、パンチガイド５２に沿って下降するパンチ５１との間で加圧される。その加圧により、燃料通路ＦＰ（即ち中央油室３７、案内通路３８及び旋回室３９）となる凹みがワーク０３６の上面３６ｉにプレス成形される。   As shown in FIG. 4A, a work 036 made of a metal plate previously processed into a disk shape that is the same shape as the final product of the injector plate 36 is first placed on a die 50 and is punched by a punch guide 52. The outer periphery can be suppressed. Next, the workpiece 036 is pressurized between the die 50 and the punch 51 that descends along the punch guide 52 as shown in FIG. By the pressurization, a recess that becomes the fuel passage FP (that is, the central oil chamber 37, the guide passage 38, and the swirl chamber 39) is press-formed on the upper surface 36i of the workpiece 036.

この場合、燃料通路ＦＰの成形用凸部として機能するパンチ５１の先部５１ａと、パンチ５１を摺動可能に嵌合させるパンチガイド５２のガイド孔５２ａとは、燃料通路ＦＰと同じ横断面形状に形成される。またダイ５０には、パンチ５１の先部５１ａに対応し且つ燃料通路ＦＰよりも若干大きめの成形用凹部５０ａが形成され、成形用凹部５０ａの内周面はテーパ面５０ａｔに形成される。更にダイ５０には、テーパ面５０ａｔに連なる低い凸部２００が、成形用凹部５０ａの開口縁部に連ねて形成されており、この凸部２００は、インジェクタプレート３６の下面３６ｏに設けられる前述の凹部１００に対応した形状に形成される。   In this case, the tip 51a of the punch 51 that functions as a molding convex portion of the fuel passage FP and the guide hole 52a of the punch guide 52 that slidably fits the punch 51 are the same in cross-sectional shape as the fuel passage FP. Formed. The die 50 is formed with a molding recess 50a corresponding to the tip 51a of the punch 51 and slightly larger than the fuel passage FP, and the inner peripheral surface of the molding recess 50a is formed in a tapered surface 50at. Further, the die 50 is formed with a low convex portion 200 continuous with the taper surface 50at so as to continue to the opening edge portion of the molding concave portion 50a. The convex portion 200 is provided on the lower surface 36o of the injector plate 36 as described above. A shape corresponding to the recess 100 is formed.

尚、上記プレス成形の際に、ダイ５０は固定状態とされるが、必要に応じて若干（即ち凸部２００の高さ分だけ）上昇駆動してもよい。或いはまた、パンチガイド５２を、固定状態のダイ５０に対し若干（即ち凸部２００の高さ分だけ）下降駆動するようにしてもよい。   Although the die 50 is fixed in the press molding, the die 50 may be lifted slightly (ie, by the height of the convex portion 200) as necessary. Alternatively, the punch guide 52 may be driven downward with respect to the fixed die 50 (that is, by the height of the convex portion 200).

而して、上記したプレス成形工程によれば、プレス成形後のワーク０３６の上面３６ｉには、燃料通路ＦＰとなる凹みがパンチ５１の先部５１ａ形状に倣うように形成され、一方、ワーク０３６の下面３６ｏには、燃料通路ＦＰに対応した***部４１がダイ５０の成形用凹部５０ａに倣うように形成される。それと共に、***部４１の外周面４１ｔは、成形用凹部５０ａのテーパ面５０ａｔに倣ってテーパ面に形成される。   Thus, according to the above-described press forming step, the recess that becomes the fuel passage FP is formed on the upper surface 36i of the work 036 after press forming so as to follow the shape of the tip portion 51a of the punch 51. On the lower surface 36o, a raised portion 41 corresponding to the fuel passage FP is formed so as to follow the molding recess 50a of the die 50. At the same time, the outer peripheral surface 41t of the raised portion 41 is formed into a tapered surface following the tapered surface 50at of the molding recess 50a.

ところで上記加圧過程で、特に燃料通路ＦＰの周面ＦＰｓは、ワーク０３６の対応部位がパンチ５１の先部５１ａにより剪断成形されることで、燃料通路ＦＰの底面ＦＰｂ側から略垂直に起立する絶壁面となり、その際に燃料通路ＦＰの周面ＦＰｓの、特に弁座部材３側の端部にはダレｄが生じ易くなる。   By the way, in the pressurizing process, the peripheral surface FPs of the fuel passage FP stands up substantially perpendicularly from the bottom surface FPb side of the fuel passage FP by shearing the corresponding portion of the work 036 by the tip 51a of the punch 51. In this case, sagging d tends to occur at the end of the peripheral surface FPs of the fuel passage FP, particularly on the valve seat member 3 side.

これに対し、本実施形態ではダイ５０に成形用凹部５０ａの開口縁部に連ねて前述の凸部２００を特設したことで、ワーク０３６の下面３６ｏには、***部４１の外周面４１ｔに連ねて、外周面４１ｔに沿って延びる凹部１００がインジェクタプレート３６のプレス成形と同時に成形される。そして、このプレス成形過程では、凸部２００の押出し作用に基づく凹部１００の形成に伴い、金属材料の一部が図４（Ｂ）の矢視ｆで示す如く燃料通路ＦＰの周面ＦＰｓの、弁座部材３側の端部（即ちダレｄの発生領域）に寄せられるように流れ易くなる。   On the other hand, in the present embodiment, the above-described convex portion 200 is specially provided in the die 50 so as to be continuous with the opening edge portion of the molding concave portion 50a. Thus, the recess 100 extending along the outer peripheral surface 41t is formed simultaneously with the press molding of the injector plate 36. In this press molding process, along with the formation of the concave portion 100 based on the pushing action of the convex portion 200, a part of the metal material is formed on the peripheral surface FPs of the fuel passage FP as indicated by an arrow f in FIG. It becomes easy to flow so that it may approach the edge part (namely, generation | occurrence | production area | region of sagging d) by the side of the valve seat member 3.

これにより、燃料通路ＦＰの周面ＦＰｓでのダレの生成量を抑制又は低減できるから、燃料通路ＦＰはその通路形態が複雑であっても成形精度を高めることができ、燃料通路ＦＰ内での燃料の円滑な流れ確保や噴射燃料の微粒化促進を図る上で有利となる。   Thereby, since the amount of sagging generated on the peripheral surface FPs of the fuel passage FP can be suppressed or reduced, the fuel passage FP can improve the molding accuracy even if its passage form is complicated, This is advantageous in ensuring a smooth flow of fuel and promoting atomization of the injected fuel.

次に、凹部１００に関して、より具体的に説明する。***部４１の、旋回室３９に対応した***部分４１Ｓの周辺では、この***部分４１Ｓの外周面４１ｔに連ねて、凹部１００が旋回室３９の周方向に沿って延びるように形成される。これにより、プレス成形過程では、凹部１００の形成に伴い金属材料の一部が旋回室３９の彎曲周面３９ａの、弁座部材３側の端部に寄せられるように流れ易くなるため、彎曲周面３９ａでのダレｄの生成量が抑制又は低減され、旋回室３９の成形精度が高められる。   Next, the recess 100 will be described more specifically. In the vicinity of the raised portion 41 </ b> S corresponding to the swirl chamber 39 of the raised portion 41, the recess 100 is formed so as to extend along the circumferential direction of the swirl chamber 39, continuing to the outer peripheral surface 41 t of the raised portion 41 </ b> S. Thereby, in the press molding process, with the formation of the concave portion 100, a part of the metal material easily flows so as to be brought close to the end portion of the curved peripheral surface 39a of the swirl chamber 39 on the valve seat member 3 side. The amount of sag d generated on the surface 39a is suppressed or reduced, and the molding accuracy of the swirl chamber 39 is increased.

一方、***部４１の、案内通路３８に対応した***部分４１Ｇの周辺では、この***部分４１Ｇの外周面４１ｔに連ねて、凹部１００が案内通路３８の長手方向に沿って延びるように形成される。これにより、プレス成形過程では、凹部１００の形成に伴い金属材料の一部が案内通路３８の両内側面３８ｉ，３８ｏの、弁座部材３側の端部に寄せられるように流れ易くなるため、両内側面３８ｉ，３８ｏでのダレの生成量が抑制又は低減され、案内通路３８の成形精度が高められる。   On the other hand, in the vicinity of the raised portion 41G corresponding to the guide passage 38 of the raised portion 41, the concave portion 100 is formed so as to extend along the longitudinal direction of the guide passage 38, continuing to the outer peripheral surface 41t of the raised portion 41G. . Thereby, in the press molding process, with the formation of the recess 100, a part of the metal material easily flows so as to be brought close to the end portions on the valve seat member 3 side of the both inner side surfaces 38i, 38o of the guide passage 38. The amount of sagging on both inner side surfaces 38i, 38o is suppressed or reduced, and the molding accuracy of the guide passage 38 is increased.

また本実施形態では、凹部１００の深さは、インジェクタプレート３６の板厚の４０％以下に設定される。これにより、凹部１００が過度に深くなる虞れはなくなることから、凹部１００が深過ぎることに因るインジェクタプレート３６のクラック発生を効果的に回避可能となる。   In the present embodiment, the depth of the recess 100 is set to 40% or less of the thickness of the injector plate 36. Thereby, since there is no possibility that the recessed part 100 will become deep too much, it becomes possible to avoid effectively the crack generation | occurrence | production of the injector plate 36 resulting from the recessed part 100 being too deep.

以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

例えば、燃料通路ＦＰにおける案内通路３８及び旋回室３９の数や配列は、要求される燃料噴霧フォームの本数や形状に応じて適宜選定することができる。例えば、前記実施形態では、燃料通路ＦＰの中央油室３７（弁孔１０との連通部）から案内通路３８を放射状且つ直線状に延ばしたものを例示したが、本発明では、案内通路３８を放射方向から周方向に多少傾斜して径方向外方側に延ばしたもの、或いは、案内通路３８を多少カーブさせて曲線状に延ばしたものに適用してもよい。また案内通路３８及び旋回室３９の組の数は、実施形態では６組であるが、それ以外の任意の数、例えば４組でもよい。   For example, the number and arrangement of the guide passages 38 and the swirl chambers 39 in the fuel passage FP can be appropriately selected according to the number and shape of the required fuel spray foams. For example, in the above embodiment, the guide passage 38 is extended radially and linearly from the central oil chamber 37 (communication portion with the valve hole 10) of the fuel passage FP. The present invention may be applied to one that is slightly inclined in the circumferential direction from the radial direction and extends outward in the radial direction, or one in which the guide passage 38 is slightly curved and extended in a curved shape. The number of sets of the guide passage 38 and the swirl chamber 39 is six in the embodiment, but may be any other number, for example, four.

また前記実施形態では、噴射燃料の微粒化を特に促進するために、燃料通路ＦＰを複数の案内通路３８と、各々の案内通路３８の下流端が接線方向に開口する複数の旋回室３９とを組み合わせた通路構成としているが、本発明の燃料通路の通路構成は前記実施形態に限定されず、少なくとも弁孔１０から燃料噴孔４３に向けてスムーズに燃料を案内し得る通路構成であればよい。例えば、前記特許文献１に示されるように、旋回室を省略して複数の案内通路の下流端部底面に燃料噴孔を開口させるような燃料通路においても本発明を適用可能である。   In the above-described embodiment, in order to particularly promote atomization of the injected fuel, the fuel passage FP includes a plurality of guide passages 38 and a plurality of swirl chambers 39 whose downstream ends open in the tangential direction. Although the passage configuration is combined, the passage configuration of the fuel passage of the present invention is not limited to the above embodiment, and may be any passage configuration that can smoothly guide the fuel from the valve hole 10 toward the fuel injection hole 43 at least. . For example, as disclosed in Patent Document 1, the present invention can also be applied to a fuel passage in which a swirl chamber is omitted and fuel injection holes are opened at the bottoms of the downstream ends of a plurality of guide passages.

また前記実施形態では、インジェクタプレート３６と弁座部材３との結合手段として、レーザビームによる全周溶接ｗが例示されたが、その結合手段は、溶接手段に限定されない。即ち、インジェクタプレート３６と弁座部材３との間を全周に亘り液密に結合し得る結合手段であれば、種々の結合手段を採用可能である。   Moreover, in the said embodiment, the perimeter welding w by a laser beam was illustrated as a connection means of the injector plate 36 and the valve seat member 3, However, The connection means is not limited to a welding means. That is, various coupling means can be employed as long as the coupling means can couple the injector plate 36 and the valve seat member 3 in a liquid-tight manner over the entire circumference.

また前記実施形態では、インジェクタプレート３６は、その板厚が例えば０．１ｍｍ前後の薄肉の板状であるものを例示したが、本発明は、実施形態よりも厚肉又は更に薄肉の（但しプレス成形で燃料通路ＦＰ（案内通路３８及び旋回室３９）を精度よく成形可能な程度の肉厚の）インジェクタプレートにも実施可能である。   In the above embodiment, the injector plate 36 is exemplified as a thin plate having a plate thickness of, for example, about 0.1 mm. However, the present invention is thicker or thinner than the embodiment (however, press The fuel plate FP (the guide passage 38 and the swirl chamber 39) can be formed into an injector plate having a thickness that can be accurately formed.

また前記実施形態では、インジェクタプレート３６の下面３６ｏの、***部４１周辺に形成される凹部１００を、***部４１の外周面４１ｔの根元部分に連続させたものを示したが、本発明では凹部１００を、所期の作用効果を達成し得る範囲で、***部４１の外周面４１ｔの根元部分の近傍（即ち根元部分から近距離ではあるが多少離間した部位）に形成してもよい。   Moreover, in the said embodiment, although the recessed part 100 formed in the periphery of the protruding part 41 of the lower surface 36o of the injector plate 36 was shown to be continued to the root part of the outer peripheral surface 41t of the protruding part 41, in this invention, the recessed part was shown. 100 may be formed in the vicinity of the root portion of the outer peripheral surface 41t of the raised portion 41 (that is, a portion that is a short distance from the root portion, but is slightly separated) within a range in which the intended effect can be achieved.

また前記実施形態では、燃料通路ＦＰを１回のプレス成形工程で成形するものを示したが、本発明では、燃料通路ＦＰを複数回のプレス成形工程で成形してもよい。その場合、例えば、一次のプレス成形工程では、パンチ５１及びパンチガイド５２として前記実施形態と同じものを使用するが、ダイ５０は凸部２００を有しないものを使用し、これにより、一次のプレス成形工程後のワーク０３６には燃料通路ＦＰ及び***部４１が成形されても凹部１００は成形されない。また二次のプレス成形工程では、凸部２００を有する押し金型（例えば図４（Ｂ）のダイ５０と同形）と、ワーク０３６の上面３６ｉを受ける受け金型（例えば図４（Ｂ）のパンチ５１及びパンチガイド５２を一体化したものと同形）との相互間でワーク０３６を加圧することで、プレス成形工程後のワーク０３６に凹部１００が成形され、それと共に、一次のプレス成形工程で燃料通路ＦＰの周面ＦＰｓに生じていたダレｄが縮小される。   In the above embodiment, the fuel passage FP is formed by a single press molding process. However, in the present invention, the fuel passage FP may be formed by a plurality of press molding processes. In that case, for example, in the primary press molding process, the punch 51 and the punch guide 52 that are the same as those in the above embodiment are used, but the die 50 does not have the convex portion 200, and thereby the primary press is performed. Even if the fuel passage FP and the raised portion 41 are formed in the workpiece 036 after the forming step, the concave portion 100 is not formed. In the secondary press molding process, a pressing die having a convex portion 200 (for example, the same shape as the die 50 in FIG. 4B) and a receiving die for receiving the upper surface 36i of the workpiece 036 (for example, in FIG. 4B). By pressing the work 036 between the punch 51 and the punch guide 52 in the same shape), the recess 100 is formed in the work 036 after the press forming process, and at the same time, in the primary press forming process. The sagging d generated on the peripheral surface FPs of the fuel passage FP is reduced.

ＦＰ・・・・・燃料通路
Ｉ・・・・・・燃料噴射弁
３・・・・・・弁座部材
８・・・・・・弁座
１０・・・・・弁孔
１６・・・・・弁体
３６・・・・・インジェクタプレート
３６ｉ・・・・上面（弁座部材との対向面）
３６ｏ・・・・下面（弁座部材とは反対側の外表面）
３７・・・・・中央油室（連通部）
３８・・・・・案内通路
３９・・・・・旋回室
４１・・・・・***部
４１Ｇ・・・・案内通路に対応した***部分
４１Ｓ・・・・旋回室に対応した***部分
４１ｔ・・・・外周面
４３・・・・・燃料噴孔
１００・・・・凹部 FP ... Fuel passage I ... Fuel injection valve 3 ... Valve seat member 8 ... Valve seat 10 ... Valve hole 16 ...・ Valve body 36... Injector plate 36 i... Upper surface (surface facing the valve seat member)
36o ··· Lower surface (outer surface opposite to valve seat member)
37 …… Central oil chamber (communication part)
38... Guide passage 39... Swirl chamber 41... Raised portion 41 G... Raised portion 41 S corresponding to the guide passage. ... Outer peripheral surface 43 ... Fuel injection hole 100 ... Recess

Claims (4)

弁座（８）、及び該弁座（８）の中心部を貫通する弁孔（１０）を有する弁座部材（３）と、前記弁座（８）と協働して前記弁孔（１０）を開閉する弁体（１６）と、燃料噴孔（４３）を有して前記弁座部材（３）の外端面に結合されるインジェクタプレート（３６）とを備え、前記インジェクタプレート（３６）が、プレス成形された金属板で構成される電磁式燃料噴射弁において、
前記インジェクタプレート（３６）の、前記弁座部材（３）との対向面（３６ｉ）には、前記弁孔（１０）から前記燃料噴孔（４３）に向けて燃料を案内する燃料通路（ＦＰ）が凹設されると共に、その燃料通路（ＦＰ）の、前記弁座部材（３）側の開放面が該弁座部材（３）で塞がれており、
前記インジェクタプレート（３６）の、前記弁座部材（３）とは反対側の外表面（３６ｏ）には、前記燃料通路（ＦＰ）に対応した***部（４１）が形成され、
前記***部（４１）の少なくとも一部の外周面（４１ｔ）に連ねて、又は該少なくとも一部の外周面（４１ｔ）の近傍において、前記燃料通路（ＦＰ）の周方向に沿って延びる凹部（１００）が、前記インジェクタプレート（３６）の前記外表面（３６ｏ）に形成されることを特徴とする電磁式燃料噴射弁。 A valve seat member (3) having a valve seat (8) and a valve hole (10) penetrating the central portion of the valve seat (8), and the valve hole (10) in cooperation with the valve seat (8) ) And an injector plate (36) having a fuel injection hole (43) and coupled to the outer end surface of the valve seat member (3), the injector plate (36) In an electromagnetic fuel injection valve composed of a press-formed metal plate,
A fuel passage (FP) for guiding fuel from the valve hole (10) toward the fuel injection hole (43) is provided on a surface (36i) of the injector plate (36) facing the valve seat member (3). ) Is recessed, and an open surface of the fuel passage (FP) on the valve seat member (3) side is closed by the valve seat member (3),
On the outer surface (36o) of the injector plate (36) opposite to the valve seat member (3), a raised portion (41) corresponding to the fuel passage (FP) is formed,
A recess extending along the circumferential direction of the fuel passage (FP) in connection with at least a part of the outer peripheral surface (41t) of the raised part (41) or in the vicinity of the at least a part of the outer peripheral surface (41t). 100) is formed on the outer surface (36o) of the injector plate (36). 前記燃料通路（ＦＰ）は、前記弁孔（１０）との連通部（３７）から所定方向に延びる案内通路（３８）と、前記案内通路（３８）の下流端に接続されて前記弁孔（１０）から該案内通路（３８）を経て流入した燃料を旋回させ且つ底部に前記燃料噴孔（４３）の上流端を開口させた旋回室（３９）とを少なくとも有しており、
前記凹部（１００）は、前記***部（４１）の、前記旋回室（３９）に対応した***部分（４１Ｓ）の外周面（４１ｔ）に連ねて、又は該***部分（４１Ｓ）の外周面（４１ｔ）の近傍において、前記旋回室（３９）の周方向に沿って延びることを特徴とする、請求項１に記載の電磁式燃料噴射弁。 The fuel passage (FP) is connected to a guide passage (38) extending in a predetermined direction from a communicating portion (37) with the valve hole (10) and a downstream end of the guide passage (38) to connect the valve hole (38). 10) having at least a swirl chamber (39) that swirls the fuel flowing in through the guide passage (38) and opens the upstream end of the fuel injection hole (43) at the bottom;
The concave portion (100) is connected to the outer peripheral surface (41t) of the raised portion (41S) corresponding to the swirl chamber (39) of the raised portion (41) or the outer peripheral surface of the raised portion (41S) ( The electromagnetic fuel injection valve according to claim 1, characterized in that it extends along the circumferential direction of the swirl chamber (39) in the vicinity of 41t). 前記燃料通路（ＦＰ）は、前記弁孔（１０）との連通部（３７）から所定方向に延びる案内通路（３８）と、前記案内通路（３８）の下流端に接続されて前記弁孔（１０）から該案内通路（３８）を経て流入した燃料を旋回させ且つ底部に前記燃料噴孔（４３）の上流端を開口させた旋回室（３９）とを少なくとも有しており、
前記凹部（１００）は、前記***部（４１）の、前記案内通路（３８）に対応した***部分（４１Ｇ）の外周面（４１ｔ）に連ねて、又は該***部分（４１Ｇ）の外周面（４１ｔ）の近傍において、前記案内通路（３８）の長手方向に沿って延びることを特徴とする、請求項１に記載の電磁式燃料噴射弁。 The fuel passage (FP) is connected to a guide passage (38) extending in a predetermined direction from a communicating portion (37) with the valve hole (10) and a downstream end of the guide passage (38) to connect the valve hole (38). 10) having at least a swirl chamber (39) that swirls the fuel flowing in through the guide passage (38) and opens the upstream end of the fuel injection hole (43) at the bottom;
The recessed portion (100) is connected to the outer peripheral surface (41t) of the raised portion (41G) corresponding to the guide passage (38) of the raised portion (41) or the outer peripheral surface of the raised portion (41G) ( 41. The electromagnetic fuel injection valve according to claim 1, characterized in that it extends along the longitudinal direction of the guide passage (38) in the vicinity of 41t). 前記凹部（１００）の深さは、前記インジェクタプレート（３６）の板厚の４０％以下に設定されることを特徴とする、請求項１〜３の何れか１項に記載の電磁式燃料噴射弁。   The electromagnetic fuel injection according to any one of claims 1 to 3, wherein the depth of the recess (100) is set to 40% or less of the thickness of the injector plate (36). valve.

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