JP2009257237A

JP2009257237A - Fuel injection device

Info

Publication number: JP2009257237A
Application number: JP2008108221A
Authority: JP
Inventors: Isao Asada; 勲浅田
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2008-04-17
Filing date: 2008-04-17
Publication date: 2009-11-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection device preventing burrs which may be formed by screw fitting from intruding into a control valve storage chamber in fuel injection devices in which components of control valves are screwed and fitted to housings. <P>SOLUTION: This fuel injection device 1 is provided with a valve housing (support member) 25 supporting a valve element 30 of a control valve 6 movably in an axial direction, and a housing 3 storing the valve element 30 and the valve housing 25 therein and including an inner wall 23 having the valve housing 25 screwed and fitted thereto, and has a control valve storage chamber 41 formed inside the inner wall 23 by screwing and fitting the valve housing 25 on the inner wall 23. Both of the valve housing 25 and inner wall 23 are provided with screw parts 23r, 25r screwing and fastening the both, and a sealing part (diameter expansion annular part) 252c provided on a specific member 25 of the both and blocking an end part at a control valve storage chamber 41 side of the screw part 25r. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、燃料噴射装置に関し、例えば内燃機関に燃料を噴射供給する燃料噴射装置に適用して好適なものである。 The present invention relates to a fuel injection device, and is suitably applied to, for example, a fuel injection device that injects and supplies fuel to an internal combustion engine.

従来、燃料噴射装置は、略棒状を呈し、エンジンの各気筒に取付けられ、その気筒の燃焼室内に燃料を直接噴射する燃料噴射弁が知られている（特許文献１等参照）。燃料噴射弁は、燃料噴射弁本体と、制御弁とを有しており、噴孔を開閉するノズルニードルの反噴孔側に設けた圧力制御室（以下、背圧室という）内の燃料圧力を制御弁で制御することによって、噴孔を開閉する時期を調整し、これにより噴射特性を制御するのである。 2. Description of the Related Art Conventionally, a fuel injection device has a substantially rod shape, is attached to each cylinder of an engine, and a fuel injection valve that directly injects fuel into a combustion chamber of the cylinder is known (see Patent Document 1, etc.). The fuel injection valve has a fuel injection valve main body and a control valve, and fuel pressure in a pressure control chamber (hereinafter referred to as a back pressure chamber) provided on the side opposite to the nozzle hole of the nozzle needle that opens and closes the nozzle hole. Is controlled by a control valve to adjust the timing for opening and closing the nozzle hole, thereby controlling the injection characteristics.

この種の背圧室からの作動油（燃料）の排出を断続する制御部としては、電磁弁が用いられ、電磁弁は、弁体と、弁体を軸方向移動可能に支持する「弁ハウジング」としての支持部材を備えている。弁体は、ハウジングを構成する弁座部材の弁座に着座及び離座すると共に、弁座部材と支持部材が密着した状態で支持部材に支持される。 As a control unit for intermittently discharging the hydraulic oil (fuel) from this type of back pressure chamber, an electromagnetic valve is used. The electromagnetic valve supports the valve body and the valve body so as to be movable in the axial direction. As a supporting member. The valve body is seated and separated from the valve seat of the valve seat member constituting the housing, and is supported by the support member in a state where the valve seat member and the support member are in close contact with each other.

このような燃料噴射装置の一種として特許文献１に開示の装置では、支持部材とハウジングのねじ嵌合による締め付け軸力を、弁座部材及び支持部材に作用させることで、弁座部材と支持部材とを密着する状態にしている。この技術では、背圧室内の燃料を、弁座を通して支持部材の反弁座部材の端部側に形成される制御弁収容室に排出することで、背圧室の燃料圧力が制御される。
特開２００６−１９４２３７号公報 In the device disclosed in Patent Document 1 as a kind of such fuel injection device, the valve seat member and the support member are made to act on the valve seat member and the support member by applying a tightening axial force caused by screw fitting between the support member and the housing. Are in close contact with each other. In this technique, the fuel pressure in the back pressure chamber is controlled by discharging the fuel in the back pressure chamber through the valve seat to the control valve housing chamber formed on the end side of the counter valve seat member of the support member.
JP 2006-194237 A

上記特許文献１の従来技術では、支持部材をハウジングにねじ嵌合時において、ねじ部を構成する雄ねじ及び雌ねじ間の嵌合代の製造ばらつき、あるいは雄ねじ及び雌ねじ間で傾いてねじ締め付けされる等によって、ねじ部に「ばり」が発生するという懸念がある。ねじ部に「ばり」が発生し、その「ばり」が制御弁収容室に混入すると、弁体のリフト量等を阻害し、ひいては噴孔から噴射される燃料噴射量などの燃料噴射特性が変化してしまうおそれがある。 In the prior art disclosed in Patent Document 1, when the support member is screwed into the housing, the manufacturing variation of the fitting allowance between the male screw and the female screw constituting the screw portion, or the screw is tilted between the male screw and the female screw and tightened. Therefore, there is a concern that “flash” occurs in the screw portion. If a “flash” occurs in the threaded portion and the “flash” enters the control valve storage chamber, the lift amount of the valve element is hindered, and as a result, the fuel injection characteristics such as the fuel injection amount injected from the nozzle hole change. There is a risk of it.

上記ねじ嵌合後に、「ばり」を除去するために高圧洗浄や超音波洗浄などを行なうことが考えられる。しかしながら、このような特殊な除去方法を用いたとしても、ねじ部において雄ねじ及び雌ねじ間の隙間に入り込んだ「ばり」を完全に排出し、除去することは難しいのである。「ばり」がねじ部内に残留する場合には、燃料噴射弁作動中つまり制御弁作動中に、そのような「ばり」が制御弁収容室に流出するおそれがあるため、依然として、弁体のリフト量等の制御弁の機能が阻害されるという懸念があるのである。 It is conceivable to perform high-pressure cleaning, ultrasonic cleaning, or the like to remove the “flash” after the screw fitting. However, even if such a special removal method is used, it is difficult to completely discharge and remove the “flash” that has entered the gap between the male screw and the female screw at the screw portion. If the “flash” remains in the threaded portion, the “flash” may flow out to the control valve housing chamber during the operation of the fuel injection valve, that is, during the control valve operation. There is a concern that the function of the control valve, such as quantity, will be hindered.

本発明は、このような事情を考慮してなされたものであり、その目的は、制御弁の構成部材をハウジングにねじ嵌合するものにおいて、ねじ嵌合により生じるおそれのあるばりが制御弁収容室へ侵入するのを防止する燃料噴射装置を提供することにある。 The present invention has been made in consideration of such circumstances, and the object thereof is to accommodate a control valve in a case where a component that constitutes a control valve is screw-fitted to a housing, and a beam that may be generated by screw fitting is contained in the control valve. An object of the present invention is to provide a fuel injection device that prevents entry into a chamber.

本発明は、上記目的を達成するために以下の技術的手段を備える。 In order to achieve the above object, the present invention comprises the following technical means.

即ち、請求項１乃至９に記載の発明では、制御弁の弁体を軸方向移動可能に支持する弁ハウジングと、弁体及び弁ハウジングを内部に収容すると共に、弁ハウジングをねじ締結する内壁を有するハウジングと、を備え、弁ハウジングを前記内壁にねじ嵌合することにより前記内壁の内側に制御弁収容室を形成する燃料噴射装置において、
弁ハウジング及び前記内壁の両者は、両者を互いにねじ締結するねじ部と、両者のうちの特定部材に設けられ、ねじ部の制御弁収容室側の端部を塞ぐ封止部と、を備えていることを特徴とする。 That is, according to the first to ninth aspects of the present invention, the valve housing for supporting the valve body of the control valve so as to be movable in the axial direction, the valve body and the valve housing are accommodated therein, and the inner wall for screwing the valve housing is provided. A fuel injection device that forms a control valve housing chamber inside the inner wall by screw-fitting the valve housing to the inner wall.
Both the valve housing and the inner wall are provided with a screw portion for screwing them together, and a sealing portion provided on a specific member of both to close the end of the screw portion on the control valve housing chamber side. It is characterized by being.

かかる発明では、制御弁の弁体を軸方向移動可能に支持する弁ハウジングと、弁体及び弁ハウジングを内部に収容し、弁ハウジングをねじ締結する内壁を有するハウジングは、弁ハウジング及び内壁の両者に設けられたねじ部によって、ねじ嵌合されて内壁の内側に制御弁収容室を形成することになるが、このようなねじ部は、ねじ嵌合によりばりを生じるおそれがある。 In such an invention, the valve housing that supports the valve body of the control valve so as to be axially movable, the housing that houses the valve body and the valve housing, and has the inner wall that is screwed to the valve housing are both the valve housing and the inner wall. The screw portion provided on the inner wall is screwed to form a control valve accommodating chamber inside the inner wall. However, such a screw portion may cause a flash due to screw fitting.

しかしながら、上記構成に加えて、「弁ハウジング及び内壁の両者のうちの特定部材は、ねじ部の制御弁収容室側の端部を塞ぐ封止部を設ける」という構成としたので、上記封止部によりねじ部の制御弁収容室側の端部を塞ぐことができる。したがって、ねじ部に上記ばりを生じ、万が一当該ばりがねじ部内に残留した場合があったとしても、上記封止部によりねじ部の制御弁収容室側の端部が塞がれるので、ねじ部の上記端部から制御弁収容室へばりが侵入するのを防止することができる。 However, in addition to the above configuration, since the specific member of both the valve housing and the inner wall is provided with a sealing portion that closes the end of the screw portion on the control valve housing chamber side, the sealing The end of the threaded portion on the control valve accommodating chamber side can be closed by the portion. Therefore, even if the burr is generated in the screw part and the burr remains in the screw part, the end of the screw part on the control valve housing chamber side is blocked by the sealing part. It is possible to prevent the flash from entering the control valve accommodating chamber from the above-mentioned end portion.

また、請求項２に記載の発明では、封止部は、ねじ部の制御弁収容室側の端部を挟んで前記内壁及び弁ハウジングを押し当てる押し当て面を有していることを特徴とする。 Further, in the invention according to claim 2, the sealing portion has a pressing surface that presses the inner wall and the valve housing across the end portion of the screw portion on the control valve accommodating chamber side. To do.

これによると、前記封止部は、ねじ部の制御弁収容室側の端部、及び上記端部を挟む内壁及び弁ハウジングのうちの上記端部の周辺部分を、押し当て面で押し当てることができる。したがって、封止部の押し当て面によってねじ部の制御弁収容室側の端部を確実に塞ぐことができるのである。 According to this, the said sealing part presses the edge part by the side of the control valve storage chamber of a thread part, and the peripheral part of the said edge part among the inner wall and valve housing which pinch | interposes the said edge part with a pressing surface. Can do. Therefore, the end of the screw portion on the control valve housing chamber side can be reliably closed by the pressing surface of the sealing portion.

また、上記押し当て面は、請求項３に記載の発明の如く、軸方向に対して傾斜して特定部材に形成され、押し当て面と、押し当て面が押し当てられる対向部分とは、軸方向に隙間なく配置され、または所定の間隔を置いて配置されていることが好ましい。 Further, as in the invention described in claim 3, the pressing surface is formed on the specific member so as to be inclined with respect to the axial direction, and the pressing surface and the opposed portion to which the pressing surface is pressed are defined as a shaft. It is preferable that they are arranged without gaps in the direction or arranged at a predetermined interval.

これによると、押し当て面と、押し当て面が押し当てられる対向部分とは、隙間なく接している状態、または軸方向に対し、上記間隔に相当する傾斜した隙間を空けた状態で配置されることになる。このような傾斜した隙間は、軸方向に直交する隙間に比べて、隙間の最短距離を小さく抑えることができる。 According to this, the pressing surface and the facing portion to which the pressing surface is pressed are arranged in a state where they are in contact with each other without a gap, or in a state where an inclined gap corresponding to the above-described interval is left in the axial direction. It will be. Such an inclined gap can keep the shortest distance of the gap smaller than a gap perpendicular to the axial direction.

例えば上記押し当て面及び対向部分間で隙間なく接している状態になくとも、ばりの通過を抑制する微細な隙間を容易に形成することができ、ひいては実質的に隙間なく接しているのと同じ状態とすることが可能となる。 For example, even if it is not in a state where there is no gap between the pressing surface and the opposed portion, a fine gap that suppresses the passage of the beam can be easily formed, and as a result, it is substantially the same as being in contact with no gap. It becomes possible to be in a state.

また、上記封止部を、請求項４または請求項５に記載の発明の如く、特定部材としての弁ハウジングに設け、かつ円環状を呈する円環状部材に形成すると共に、当該円環状部材を弁ハウジングの固定コア側の端部に一体的に形成する構成とすることができる。これにより、例えば弁ハウジングをハウジングの内壁にねじ嵌合する組付け作業と、ねじ部の上記端部を塞ぐ封止作業とが同時に行なえるので、優れた生産性を有する燃料噴射装置を得ることができる。 Further, as in the invention described in claim 4 or claim 5, the sealing portion is provided in a valve housing as a specific member, and is formed in an annular member having an annular shape. It can be set as the structure formed integrally in the edge part by the side of the fixed core of a housing. As a result, for example, an assembly operation for screw-fitting the valve housing to the inner wall of the housing and a sealing operation for closing the end portion of the screw portion can be performed at the same time, so that a fuel injection device having excellent productivity can be obtained. Can do.

特に、請求項５に記載の発明によれば、上記封止部を非磁性材料で形成するので、固定コア及び弁体で構成され、上記弁体を固定コアが磁力により吸引する作用力（以下、単に「磁気吸引力」という）を発生する磁力を形成する磁気回路から、弁ハウジングへの磁束の漏れを防止するのが容易にできる。それ故に、上記弁体及び固定コア間に作用する磁気吸引力を高めることが可能となる。 In particular, according to the invention described in claim 5, since the sealing portion is formed of a non-magnetic material, the sealing portion is constituted by a fixed core and a valve body, and an action force (hereinafter referred to as a magnetic force) that attracts the valve body by a magnetic force. It is easy to prevent leakage of magnetic flux to the valve housing from a magnetic circuit that forms a magnetic force that simply generates a "magnetic attraction". Therefore, it is possible to increase the magnetic attractive force acting between the valve body and the fixed core.

また、請求項６に記載の発明の如く、両者のねじ部のうち、特定のねじ部は、当該特定ねじ部の制御弁収容室側の端部に設けられ、少なくともねじ部の頂部を除いた環状の溝部を備えていることを特徴とする。 Further, as in the invention described in claim 6, among the screw portions, the specific screw portion is provided at the end of the specific screw portion on the control valve accommodating chamber side, and at least the top portion of the screw portion is excluded. An annular groove is provided.

これによると、互いにねじ締結される弁ハウジング及び前記内壁の双方のねじ部のうち、特定のねじ部において制御弁収容室側の端部に、少なくともねじ部の頂部を除いた環状の溝部を設けるという構成としている。それ故に、弁ハウジング及びハウジングの前記内壁のねじ嵌合時において、ねじ部にばりが発生したとしても、そのようなばりを、特定のねじ部側に設けた環状の溝部内に捕捉することができる。これにより、ねじ部において溝部から先の上記端部側のねじ部部分へ、ばりが排出されるのを抑制することができる。 According to this, among the threaded parts of both the valve housing and the inner wall that are screwed together, an annular groove part is provided at the end part on the control valve accommodating chamber side in a specific threaded part, excluding at least the top part of the threaded part. The structure is as follows. Therefore, even when a flash occurs in the threaded portion when the valve housing and the inner wall of the housing are threaded, such a flash can be captured in an annular groove provided on the specific threaded portion side. it can. Thereby, it can suppress that a flash is discharged | emitted from the groove part in the thread part to the thread part part of the said edge part side ahead.

したがって、ねじ部の制御弁収容室側の端部から制御弁収容室へばりが侵入するのを効果的に防止することができる。 Therefore, it is possible to effectively prevent the flash from entering the control valve storage chamber from the end of the screw portion on the control valve storage chamber side.

また、請求項７に記載の発明では、制御弁の弁体を軸方向移動可能に支持する弁ハウジングと、弁体及び弁ハウジングを内部に収容すると共に、弁ハウジングをねじ締結する内壁を有するハウジングと、を備え、弁ハウジングを前記内壁にねじ嵌合することにより前記内壁の内側に制御弁収容室を形成する燃料噴射装置において、
弁ハウジング及び前記内壁の両者は、両者を互いにねじ締結するねじ部と、両者のねじ部のうち、特定のねじ部は、当該特定ねじ部の制御弁収容室側の端部に設けられ、少なくともねじ部の頂部を除いた環状の溝部と、を備えていることを特徴とする。 According to the seventh aspect of the present invention, there is provided a valve housing that supports the valve body of the control valve so as to be axially movable, a housing that houses the valve body and the valve housing, and has an inner wall that is screwed to the valve housing. And a fuel injection device that forms a control valve housing chamber inside the inner wall by screw-fitting a valve housing to the inner wall.
Both the valve housing and the inner wall are threaded portions that are screwed to each other, and of the threaded portions, a specific threaded portion is provided at an end of the specific threaded portion on the control valve housing chamber side, and at least And an annular groove part excluding the top part of the screw part.

このような構成によると、互いにねじ締結される弁ハウジング及び内壁の双方のねじ部のうち、特定のねじ部において特定ねじ部の前記制御弁収容室側の端部に、少なくともねじ部の頂部を除いた環状の溝部を設けることになる。これにより、弁ハウジング及びハウジングの内壁のねじ嵌合時においてねじ部にばりが発生したとしても、上記特定のねじ部側に設けた環状の溝部内に、発生したばりを捕捉することが可能であり、ひいては上記制御弁収容室側の端部の先にある制御弁収容室へばりが排出されるのを抑制することができる。したがって、ねじ部の制御弁収容室側の端部から制御弁収容室へばりが侵入するのを防止することが可能となる。 According to such a configuration, among the screw portions of both the valve housing and the inner wall that are screw-fastened to each other, at least the top of the screw portion at the end of the specific screw portion on the control valve housing chamber side in the specific screw portion. The removed annular groove is provided. As a result, even if a flash is generated in the threaded portion when the valve housing and the inner wall of the housing are screwed together, it is possible to capture the generated flash in the annular groove provided on the specific threaded portion side. Yes, as a result, it is possible to prevent the flash from being discharged to the control valve storage chamber at the end of the end on the control valve storage chamber side. Therefore, it is possible to prevent the flash from entering the control valve housing chamber from the end of the screw portion on the control valve housing chamber side.

また、上記環状の溝部においては、請求項８に記載の発明の如く、ねじ部が切欠かれていることが好ましい。 Moreover, in the said annular groove part, it is preferable that the thread part is notched like the invention of Claim 8.

これによると、特定のねじ部において環状の溝部が形成される部分には、互いにねじ嵌合するための相手のねじ部に対応するねじ部が取り除かれているので、発生したばりを環状の溝部内に効果的に捕捉すると共に、捕捉されたばりを効果的に溜める空間容積を確保することができる。 According to this, in the part where the annular groove is formed in the specific thread part, the thread part corresponding to the thread part of the mating part to be screwed together is removed, so that the generated flash is removed from the annular groove part. It is possible to secure a space volume in which the trapped flashes are effectively collected while being trapped effectively inside.

また、請求項９に記載の如き、ハウジングの内壁は、弁体が着座及び離座する弁座を有する弁座部材とを備え、弁ハウジングと前記内壁がねじ嵌合することにより弁ハウジングと前記弁座部材が密着する構成を有する燃料噴射装置（以下、単に「装置」という）に適用する場合であっても、ねじ部から制御弁収容室へばりが侵入するのを効果的に防止することができる。 The inner wall of the housing according to claim 9 includes a valve seat member having a valve seat on which the valve body is seated and separated, and the valve housing and the inner wall are screw-fitted so that the valve housing and the valve Even when applied to a fuel injection device (hereinafter simply referred to as “device”) having a configuration in which the valve seat member is in close contact, it is possible to effectively prevent the flash from entering the control valve housing chamber from the screw portion. Can do.

このような装置では、例えば弁ハウジングと弁座部材との密着性を高めるためには、弁ハウジングと前記内壁とのねじ嵌合による締め付け軸力を高めることが必要となる。当該軸力を増加すると、ばり発生が懸念される。しかしながら、上記装置に、請求項１乃至８に記載の発明を適用することにより、弁ハウジングと内壁とのねじ嵌合による締め付け軸力の増加と、ねじ部から制御弁収容室へのばり侵入防止との両立を図ることができる。 In such an apparatus, for example, in order to improve the adhesion between the valve housing and the valve seat member, it is necessary to increase the tightening axial force by screw fitting between the valve housing and the inner wall. When the axial force is increased, there is a concern about the occurrence of flash. However, by applying the invention according to any one of claims 1 to 8 to the above device, an increase in the tightening axial force due to screw fitting between the valve housing and the inner wall, and prevention of flash penetration from the screw portion into the control valve housing chamber are prevented. Can be achieved.

以下、本発明の複数の実施形態を図面に基づいて説明する。なお、各実施形態において対応する構成要素には同一の符号を付すことにより、重複する説明を省略する。 Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the component corresponding in each embodiment.

（第１実施形態）
図１〜図３は、本実施形態による燃料噴射弁１を用いた燃料噴射装置を示している。図１は本発明の燃料噴射装置による主たる構成である燃料噴射弁の全体構成を示しており、図２及び図３は燃料噴射弁１０の特徴的構成を示すものである。また、図３は、図２中の特徴的構成に係わる燃料噴射弁１０の組付状態を示している。 (First embodiment)
1 to 3 show a fuel injection device using the fuel injection valve 1 according to the present embodiment. FIG. 1 shows the overall configuration of a fuel injection valve, which is the main configuration of the fuel injection device of the present invention, and FIGS. 2 and 3 show the characteristic configuration of the fuel injection valve 10. FIG. 3 shows an assembled state of the fuel injection valve 10 according to the characteristic configuration in FIG.

燃料噴射装置は、例えばディーゼル機関または筒内噴射式花火点火内燃機関等の内燃機関（以下、エンジン）の気筒内の燃焼室に直接的に高圧燃料を噴射供給するシステムであり、図示しないサプライポンプ、コモンレール、および燃料噴射弁１等の構成要素を備えると共に、サプライポンプ及び燃料噴射弁１を駆動制御することより、エンジンの運転状態に応じて高圧燃料の吐出量及び噴射量を制御する制御装置としての制御回路を備えている。ここで、サプライポンプは、図示しない燃料タンクから燃料を吸い上げ燃料噴射圧力相当の燃料圧力（以下、コモンレール圧）に加圧し、加圧された高圧燃料をコモンレールへ圧送する。コモンレールは各気筒共通の蓄圧容器であり、サプライポンプから供給された高圧燃料を蓄圧すると共に、燃料噴射弁１へ分配供給する。 A fuel injection device is a system that directly injects high-pressure fuel into a combustion chamber in a cylinder of an internal combustion engine (hereinafter referred to as an engine) such as a diesel engine or an in-cylinder injection type fireworks ignition internal combustion engine. , A common rail, and a fuel injection valve 1 and the like, and a control device that controls the discharge amount and the injection amount of high-pressure fuel according to the operating state of the engine by controlling the drive of the supply pump and the fuel injection valve 1 As a control circuit. Here, the supply pump sucks up fuel from a fuel tank (not shown) and pressurizes the fuel to a fuel pressure corresponding to the fuel injection pressure (hereinafter, common rail pressure), and pumps the pressurized high pressure fuel to the common rail. The common rail is a pressure accumulating container common to each cylinder, accumulates high-pressure fuel supplied from a supply pump, and distributes and supplies it to the fuel injection valve 1.

図１に示すように、燃料噴射弁１は、ノズル部２、「ハウジング」としてのロアボデー３、制御ピストン４、「弁座部材」としてのオリフィスプレート５、及び「制御弁」としての電磁弁６等を備えている。 As shown in FIG. 1, the fuel injection valve 1 includes a nozzle portion 2, a lower body 3 as a “housing”, a control piston 4, an orifice plate 5 as a “valve seat member”, and an electromagnetic valve 6 as a “control valve”. Etc.

ノズル部２は、ノズルボデー７とノズルニードル８とで構成され、リテーニングナット９を介してロアボデー３の下端側に固定されている。ノズルボデー７には、ノズルニードル８を軸方向移動可能に収容する「ノズルニードル収容孔」としてのガイド孔１０と、このガイド孔１０に燃料を導く燃料通路１１と、ノズルニードル８の離座時（以下、単に「リフト時」という）に燃料を噴射する噴孔１２等が形成されている。ガイド孔１０は、ノズルボデー７の上端面から先端部に向かって穿設され、ガイド孔１０の先端部には、円錐状を呈し、環状に内側に縮径する「弁座部」としてのシート面部１０ｃが形成されている。シート面部１０ｃには、ノズルニードル８のシート部８ｃが当接及び離間する。 The nozzle part 2 is composed of a nozzle body 7 and a nozzle needle 8, and is fixed to the lower end side of the lower body 3 via a retaining nut 9. The nozzle body 7 has a guide hole 10 as a “nozzle needle accommodation hole” for accommodating the nozzle needle 8 so as to be movable in the axial direction, a fuel passage 11 for guiding fuel to the guide hole 10, and when the nozzle needle 8 is separated ( Hereinafter, the nozzle holes 12 and the like for injecting fuel are simply formed during the “lifting”. The guide hole 10 is perforated from the upper end surface of the nozzle body 7 toward the front end portion, and the front end portion of the guide hole 10 has a conical shape, and a seat surface portion as a “valve seat portion” that radially decreases in diameter. 10c is formed. The sheet portion 8c of the nozzle needle 8 contacts and separates from the sheet surface portion 10c.

また、ガイド孔１０の燃料流路の途中には、内径が拡大し、燃料を溜めることが可能な燃料溜まり部１３が形成されている。ガイド孔１０は、燃料溜まり部１３より上方にあるガイド孔部分（以下、摺動孔という）１０ｃと、燃料溜まり部１３より下方にあるガイド孔部分（以下、燃料通路形成孔という）１０ｂとに形成され、摺動孔１０ｃはノズルニードル８を軸方向に摺動可能に支持する。燃料通路形成孔１０ｂの内周面には上記シート面部１０ａを有すると共に、燃料通路形成孔１０ｂの内周面とノズルニードル８の軸部１０ｂの外周面との間に、環状の隙間（以下、燃料通路という）１５が形成される。 Further, in the middle of the fuel flow path of the guide hole 10, a fuel reservoir portion 13 is formed which has an inner diameter that can be stored. The guide hole 10 includes a guide hole portion (hereinafter referred to as a sliding hole) 10c above the fuel reservoir portion 13 and a guide hole portion (hereinafter referred to as a fuel passage formation hole) 10b below the fuel reservoir portion 13. The formed sliding hole 10c supports the nozzle needle 8 so as to be slidable in the axial direction. The fuel passage forming hole 10b has the seat surface portion 10a on the inner peripheral surface thereof, and an annular gap (hereinafter, referred to as an annular clearance) between the inner peripheral surface of the fuel passage forming hole 10b and the outer peripheral surface of the shaft portion 10b of the nozzle needle 8. (Referred to as fuel passage) 15 is formed.

燃料通路１１は、上流端がノズルボデー７の上端面に開口し、ロアボデー３に形成される燃料通路１４に接続されると共に、下流端が上記燃料溜まり部１３に接続され、かつ燃料溜まり部１３を介して燃料通路１５に連通している。 The fuel passage 11 has an upstream end that opens to the upper end surface of the nozzle body 7, is connected to a fuel passage 14 formed in the lower body 3, a downstream end is connected to the fuel reservoir portion 13, and the fuel reservoir portion 13 is connected to the fuel passage 11. Via the fuel passage 15.

ノズルニードル８は、上記ガイド孔１０の摺動孔１０ａに摺動自在に挿入される摺動部８ａと、上記ガイド孔１０の燃料通路形成孔１０ｂに上記隙間１５を置いて設けられる軸部８ｂとを備えている。軸部８ｂは、摺動部８ａより外径が小さく形成されており、軸部８ｂの外周面及び燃料通路形成孔１０ｂの内周面間には燃料通路１５が確保されている。 The nozzle needle 8 includes a sliding portion 8a that is slidably inserted into the sliding hole 10a of the guide hole 10, and a shaft portion 8b that is provided with the gap 15 in the fuel passage forming hole 10b of the guide hole 10. And. The shaft portion 8b has a smaller outer diameter than the sliding portion 8a, and a fuel passage 15 is secured between the outer peripheral surface of the shaft portion 8b and the inner peripheral surface of the fuel passage forming hole 10b.

軸部８ｂの先端部には、ノズルボデー７のシート面部１０ｃに軸方向に対向して配置され、シート面部１０ｃに当接及び離間することにより着座及び離座するシート部８ｃが設けられている。このシート部８ｃは、シート面部１０ｃに着座及び離座することにより、燃料通路１５と噴孔１２との間の燃料の流通及び遮断をする。 At the tip of the shaft 8b, there is provided a seat 8c that is disposed so as to face the seat surface 10c of the nozzle body 7 in the axial direction and is seated and separated by contacting and separating from the seat surface 10c. The seat portion 8c is seated on and separated from the seat surface portion 10c, thereby allowing the fuel to flow and shut off between the fuel passage 15 and the nozzle hole 12.

ロアボデー３には、配管継手部１６が設けられ、この配管継手１６に接続される燃料配管（図示せず）を介してコモンレールより高圧燃料が供給される。配管継手部１６の内部通路１７には、バーフィルタ１８が設置されており、バーフィルタ１８は燃料上流から流入する燃料中に含まれる異物を除去する燃料濾過機能を有している。ロアボデー３は、電磁弁６の一部を収容する円筒壁部２２と、制御ピストン４及びプレッシャピン部１９を収容するシリンダ孔２０と、配管継手１６に導入された高圧燃料をノズル部２側へ導く燃料通路１４と、オリフィスプレート５側へ導く燃料通路２１とを有している。 The lower body 3 is provided with a pipe joint portion 16, and high-pressure fuel is supplied from a common rail through a fuel pipe (not shown) connected to the pipe joint 16. A bar filter 18 is installed in the internal passage 17 of the pipe joint 16, and the bar filter 18 has a fuel filtering function for removing foreign matters contained in the fuel flowing in from the upstream side of the fuel. The lower body 3 has a cylindrical wall portion 22 that accommodates part of the electromagnetic valve 6, a cylinder hole 20 that accommodates the control piston 4 and the pressure pin portion 19, and high-pressure fuel introduced into the pipe joint 16 toward the nozzle portion 2. It has a fuel passage 14 that leads to it, and a fuel passage 21 that leads to the orifice plate 5 side.

制御ピストン４は、ロアボデー３のシリンダ孔２０に摺動可能に支持されており、当該制御ピストン４の上端面、シリンダ孔２０の内周面、及び上記オリフィスプレート５の内壁面とで圧力制御室５０を形成している。プレッシャピン部１９は、制御ピストン４の下端部に連接され、プレッシャピン部１９の下端面がノズルニードル８の上端面に当接するようになっている。このプレッシャピン部１９は、制御ピストン４と一体に協働（可動）し、プレッシャピン部１９の下端部周囲に挿入配置されるスプリング（以下、ノズルニードルスプリング）２４の付勢力を受けて、ノズルニードル８を閉弁方向（図１中の下方向）に付勢（押圧）している。 The control piston 4 is slidably supported in the cylinder hole 20 of the lower body 3, and a pressure control chamber is formed by the upper end surface of the control piston 4, the inner peripheral surface of the cylinder hole 20, and the inner wall surface of the orifice plate 5. 50 is formed. The pressure pin portion 19 is connected to the lower end portion of the control piston 4, and the lower end surface of the pressure pin portion 19 comes into contact with the upper end surface of the nozzle needle 8. The pressure pin portion 19 cooperates (moves) integrally with the control piston 4 and receives the urging force of a spring (hereinafter referred to as a nozzle needle spring) 24 that is inserted and arranged around the lower end portion of the pressure pin portion 19. The needle 8 is urged (pressed) in the valve closing direction (downward in FIG. 1).

オリフィスプレート５は、ロアボデー３の有底円筒状を呈する円筒壁部２２内の底部に配置されている。また、円筒壁部２２内には、電磁弁６の構成部材である「弁ハウジング」としての支持部材２５が、オリフィスプレート５、及び円筒壁部２２の内壁２３の内周とほぼ同軸上に配置されている。このオリフィスプレート５と円筒壁部２２の内壁２３の両者は、両者５、２２ａ間にオリフィスプレート５を挟み込んで、ねじ嵌合により締結固定されている。この締結固定により、支持部材２５、オリフィスプレート５、及び内壁２３の軸方向端面間は、密着面を形成する。 The orifice plate 5 is disposed at the bottom of the cylindrical wall portion 22 having a bottomed cylindrical shape of the lower body 3. Further, in the cylindrical wall portion 22, a support member 25 as a “valve housing” which is a component of the electromagnetic valve 6 is disposed substantially coaxially with the inner circumference of the orifice plate 5 and the inner wall 23 of the cylindrical wall portion 22. Has been. Both the orifice plate 5 and the inner wall 23 of the cylindrical wall portion 22 are fastened and fixed by screw fitting with the orifice plate 5 sandwiched between the two and 22a. By this fastening and fixing, a contact surface is formed between the axial end surfaces of the support member 25, the orifice plate 5, and the inner wall 23.

オリフィスプレート５は、弁体３０のボール弁３１が着座及び離座する弁座５１と、ロアボデー３に形成された燃料通路２１に連通して圧力制御室５０に高圧燃料を導く入口オリフィス２６と、上記弁座５１と圧力制御室５０に連通する連通路に設けられ、電磁弁６の開弁時に圧力制御室５０より高圧燃料を排出する出口オリフィス２７とを備えている。 The orifice plate 5 includes a valve seat 51 on which the ball valve 31 of the valve body 30 is seated and separated, an inlet orifice 26 that communicates with the fuel passage 21 formed in the lower body 3 and guides high-pressure fuel to the pressure control chamber 50; An outlet orifice 27 is provided in a communication path communicating with the valve seat 51 and the pressure control chamber 50 and discharges high-pressure fuel from the pressure control chamber 50 when the electromagnetic valve 6 is opened.

電磁弁６は、通電により電磁力を発生するコイル２８と、固定コア２９と、弁体３０を軸方向移動可能に支持する支持部材２５、弁体３０の一部を構成し、円環状の平板状部を呈する可動コア部３０ｄとを備えている。電磁弁６は、リテーニングナット３２を介してロアボデー３の円筒壁部２２に固定されると共に、支持部材２５及び弁体３０とが円筒壁部２２の内壁２３の内側に収容される。 The solenoid valve 6 comprises a coil 28 that generates an electromagnetic force when energized, a fixed core 29, a support member 25 that supports the valve body 30 so as to be movable in the axial direction, and a part of the valve body 30, and is an annular flat plate. And a movable core portion 30d having a shape portion. The electromagnetic valve 6 is fixed to the cylindrical wall portion 22 of the lower body 3 via the retaining nut 32, and the support member 25 and the valve body 30 are accommodated inside the inner wall 23 of the cylindrical wall portion 22.

コイル２８は、樹脂製のボビン３３の外周側に巻回されると共に、固定コア２９の下端開口部から内部に挿入されて内部に保持され、かつ当該下端開口部が樹脂材３４によってモールドされている。 The coil 28 is wound around the outer periphery of the resin bobbin 33, inserted into the inside from the lower end opening of the fixed core 29 and held therein, and the lower end opening is molded by the resin material 34. Yes.

固定コア２９は、例えば鉄などの磁性材料により筒状に形成され、コイル２８に通電されると、コイル２８の磁界に発生の磁力によって磁化される。発生したコイル２８の磁界により当該固定コア２８及び弁体３０の可動コア部３０ｄには、磁束が流れる磁気回路が形成されるのである。この固定コア２９は、可動コア部３０ｄ、及び弁体３０の弁体軸部３０ｊを軸方向移動可能に支持する支持孔４２、２５２ａを有する支持部材２５とほぼ同心的に形成されている。 The fixed core 29 is formed in a cylindrical shape from a magnetic material such as iron, and is magnetized by the magnetic force generated in the magnetic field of the coil 28 when the coil 28 is energized. A magnetic circuit through which magnetic flux flows is formed in the fixed core 28 and the movable core portion 30d of the valve body 30 by the generated magnetic field of the coil 28. The fixed core 29 is formed substantially concentrically with the support member 25 having support holes 42 and 252a that support the movable core portion 30d and the valve body shaft portion 30j of the valve body 30 so as to be movable in the axial direction.

また、固定コア２９は、径方向中央部を貫通する中心孔３５を有し、この中心孔３５が、固定コア２９の反可動コア部３０ｄ側に配置されるエンドハウジング３６に設けられた燃料の排出通路３７に連通する。エンドハウジング３６には、樹脂製のコネクタ３８が取り付けられ、このコネクタ３８に設けられたターミナル３９とコイル２８とが金属製の接続端子４０を介して電気的に接続されている。 The fixed core 29 has a center hole 35 penetrating the central portion in the radial direction. The center hole 35 is a fuel provided in an end housing 36 disposed on the side of the fixed core 29 opposite to the movable core 30d. It communicates with the discharge passage 37. A resin connector 38 is attached to the end housing 36, and a terminal 39 provided on the connector 38 and the coil 28 are electrically connected via a metal connection terminal 40.

弁体３０は、例えば純鉄や低炭素鋼またはフェライト系のステンレス鋼などの軟質磁性材料、あるいは珪素鋼などの高磁性材料によって形成されている。この弁体３０は、可動コア部３０ｄと、可動コア部３０ｄの反固定コア２９側に突出し、可動コア部３０ｄに対して鉛直下方に延びる弁体軸部３０ｊと、弁体軸部３０ｊの上記弁座５１側の端部に配置されるボール弁３１とを備えている。 The valve body 30 is made of a soft magnetic material such as pure iron, low carbon steel or ferritic stainless steel, or a high magnetic material such as silicon steel. The valve body 30 projects from the movable core portion 30d, the valve core shaft portion 30j that protrudes to the side opposite to the fixed core 29 of the movable core portion 30d, and extends vertically downward with respect to the movable core portion 30d. And a ball valve 31 disposed at the end on the valve seat 51 side.

このような弁体３０、固定コア２９、及び支持部材２５は、円筒壁部２２の内側に形成される「制御部収容室」としての電磁弁収容室４１内に配置されると共に、弁体３０は、固定コア２９の下端面と支持部材２５の上端面との間に、固定コア２９及び支持部材２５の両者に対しそれぞれ所定の間隔（以下、エアギャップ）を置いて配置されている。 The valve body 30, the fixed core 29, and the support member 25 are disposed in the electromagnetic valve storage chamber 41 as a “control unit storage chamber” formed inside the cylindrical wall portion 22, and the valve body 30. Are disposed between the lower end surface of the fixed core 29 and the upper end surface of the support member 25 with a predetermined distance (hereinafter referred to as an air gap) between the fixed core 29 and the support member 25.

弁体３０において可動コア部３０ｄと弁体軸部３０ｊは一体に形成されている。なお、可動コア部３０ｄと弁体軸部３０ｊはこれに限らず別体で形成されているものであってもよく、可動コア部３０ｄと弁体軸部３０ｊとが、コイル２９通電時において固定コア２９による磁気吸引力によって可動コア部３０ｄと弁体軸部３０ｊの両者が協働して固定コア２９側へ移動する構成であればいずれの構成でもよい。 In the valve body 30, the movable core portion 30d and the valve body shaft portion 30j are integrally formed. The movable core portion 30d and the valve body shaft portion 30j are not limited to this, and may be formed separately. The movable core portion 30d and the valve body shaft portion 30j are fixed when the coil 29 is energized. Any configuration may be used as long as both the movable core portion 30d and the valve body shaft portion 30j cooperate to move toward the fixed core 29 side by the magnetic attraction force by the core 29.

上記電磁弁収容室４１は、燃料で満たされており、固定コア２９の中心孔３５を通じて排出通路３７に連通している。 The electromagnetic valve housing chamber 41 is filled with fuel and communicates with the discharge passage 37 through the center hole 35 of the fixed core 29.

この弁体３０は、固定コア２９の中心孔３５を通って配設されるスプリング４３により弁座５１方向、言い換えると反固定コア側（図１及び図２中の下方向）へ付勢されている。これにより、コイル２８への通電停止時に、弁体３０の可動コア部３０ｄは、固定コア２９との間に所定のギャップが確保されている。また、コイル２８への通電時に固定コア２９が磁化されると、その磁化された固定コア２９に弁体３０が吸引され、上記エアギャップ分だけ移動して、弁体３０の可動コア部３０ｄの上端面が固定コア２９の下端面に当接する。 The valve body 30 is urged toward the valve seat 51 by the spring 43 disposed through the center hole 35 of the fixed core 29, in other words, the anti-fixed core side (downward direction in FIGS. 1 and 2). Yes. Thereby, when energization to the coil 28 is stopped, a predetermined gap is secured between the movable core portion 30 d of the valve body 30 and the fixed core 29. Further, when the fixed core 29 is magnetized when the coil 28 is energized, the valve body 30 is attracted to the magnetized fixed core 29 and moved by the air gap, and the movable core portion 30d of the valve body 30 is moved. The upper end surface comes into contact with the lower end surface of the fixed core 29.

支持部材２５は、上記支持孔４２、２５２ａと、上記電磁弁収容室４１に連通する連通孔４４、２５２ｂと、弁体３０が弁座５１から離座する離座時、即ちボール弁３１が出口オリフィス２７を開放した時に、その出口オリフィス２７と連通孔４４との間を連通する連絡通路４５とが設けられている。 The support member 25 includes the support holes 42 and 252a, the communication holes 44 and 252b communicating with the electromagnetic valve storage chamber 41, and the ball valve 31 at the time of separation when the valve body 30 is separated from the valve seat 51. A communication passage 45 is provided that communicates between the outlet orifice 27 and the communication hole 44 when the orifice 27 is opened.

また、支持部材２５は、その外周壁において円筒壁部２２の内壁２３とねじ締結する「締結構造要素」としてのねじ部２３ｒ、２５ｒを、内壁２３と共に有している。即ち、支持部材２５の外周壁に雄ねじ２５ｒが形成され、内壁２３に雌ねじ２３ｒが形成されている。 The support member 25 has screw portions 23r and 25r as “fastening structural elements” that are screwed to the inner wall 23 of the cylindrical wall portion 22 on the outer peripheral wall thereof together with the inner wall 23. That is, a male screw 25 r is formed on the outer peripheral wall of the support member 25, and a female screw 23 r is formed on the inner wall 23.

ここで、内筒壁部２２を有するロアボデー３、及びオリフィスプレート５は請求範囲に記載のハウジングに相当し、また、支持部材２５は請求範囲に記載の弁ハウジングに相当する。 Here, the lower body 3 having the inner cylindrical wall portion 22 and the orifice plate 5 correspond to the housing described in the claims, and the support member 25 corresponds to the valve housing described in the claims.

以上、燃料噴射弁１の基本構成について説明した。以下、燃料噴射弁１の特徴的構成について説明する。 The basic configuration of the fuel injection valve 1 has been described above. Hereinafter, a characteristic configuration of the fuel injection valve 1 will be described.

（特徴的構成）
図２、３に示すように、円筒状を呈する支持部材２５は、円筒状に形成された支持部本体２５１と、支持部本体２５１の固定コア２９側の端部２５１ａに設けられ、円環板状に形成された円環状部材２５２とを備えている。支持部本体２５１は鉄系の磁性材料から形成され、円環状部材２５２は例えばオーステナイト系ステンレス鋼またはアルミニウムなどの非磁性材料から形成されている。円環状部材２５２は支持部本体２５１の上記端部２５１ａに、ろう付などで接合することにより固定されている。なお、円環状部材２５２を支持部本体２５１に固定する方法としては、これに限らず、レーザ溶接により接合するもの、あるいはかしめや圧入などの嵌合により固定するものであってもよい。 (Characteristic configuration)
As shown in FIGS. 2 and 3, the support member 25 having a cylindrical shape is provided on a support portion main body 251 formed in a cylindrical shape and an end portion 251 a on the fixed core 29 side of the support portion main body 251, and is an annular plate. And an annular member 252 formed in a shape. The support body 251 is made of an iron-based magnetic material, and the annular member 252 is made of a non-magnetic material such as austenitic stainless steel or aluminum. The annular member 252 is fixed to the end portion 251a of the support portion main body 251 by joining by brazing or the like. The method of fixing the annular member 252 to the support portion main body 251 is not limited to this, and it may be fixed by laser welding or by fitting such as caulking or press fitting.

さらに図３に示すように、支持部本体２５１の外周部２５１ｂには、円筒壁部２２の内壁２３にねじ嵌合するための上記雄ねじ２５ｒが形成されている。また、上記外周部２５１ｂの雄ねじ２５ｒにねじ嵌合する雌ねじ２３ｒは、内壁２３の内周に形成された段差部２３ａに形成されている。 Further, as shown in FIG. 3, the male screw 25 r for screw fitting to the inner wall 23 of the cylindrical wall portion 22 is formed on the outer peripheral portion 251 b of the support portion main body 251. The female screw 23r that is screwed to the male screw 25r of the outer peripheral portion 251b is formed in a step portion 23a formed on the inner periphery of the inner wall 23.

このような円環状部材２５２は、上記外周部２５１ｂの外径よりも大きく形成されると共に、上記円筒壁部２２の内壁２３の段差部２３ａのうち、雌ねじ２３ｒより外側の部分２３ｂを押し当てるように接している。 Such an annular member 252 is formed larger than the outer diameter of the outer peripheral portion 251b, and presses the portion 23b outside the female screw 23r of the step portion 23a of the inner wall 23 of the cylindrical wall portion 22. Is in contact with

上記円環状部材２５２において段差部２３ａの上記外側の部分２３ｂに接する部位は、外側に向けて拡径する拡径環状部２５２ｃを有している。この拡径環状部２５２ｃは、ねじ部２５ｒ、２３ｒを挟んで内壁２３の段差部２３ａ及び支持部本体２５１を押し当てる押し当て面２５２ｃｂが形成されている。ここで、円環状部材２５２において少なくとも拡径環状部２５２ｃは請求範囲に記載の封止部に相当する。 A portion of the annular member 252 that is in contact with the outer portion 23b of the stepped portion 23a has an enlarged annular portion 252c that increases in diameter toward the outside. The expanded diameter annular portion 252c is formed with a pressing surface 252cb that presses the stepped portion 23a of the inner wall 23 and the support portion main body 251 with the screw portions 25r and 23r interposed therebetween. Here, in the annular member 252, at least the diameter-enlarged annular portion 252c corresponds to the sealing portion described in the claims.

これにより、支持部本体２５１及び内壁２３のねじ部２３ｒ、２５ｒの双方において電磁弁収容室４１側の端部を、上記円環状部材２５２において拡径環状部２５２ｃの押し当て面２５２ｃｂで塞ぐことができる。したがって、上記ねじ部２３ｒ、２５ｒにばりを生じ、万が一当該ばりがねじ部２３ｒ、２５ｒ内に残留した場合があったとしても、上記押し当て面２５２ｃｂによりねじ部２３ｒ、２５ｒの制御弁収容室４１側の端部が塞がれるので、ねじ部２３ｒ、２５ｒの上記端部から制御弁収容室４１へばりが侵入するのを防止することができる。 As a result, the end on the electromagnetic valve housing chamber 41 side of both the support portion main body 251 and the screw portions 23r and 25r of the inner wall 23 can be blocked by the pressing surface 252cb of the enlarged annular portion 252c in the annular member 252. it can. Therefore, even if the flash is generated in the screw portions 23r and 25r and the flash remains in the screw portions 23r and 25r, the control valve accommodating chamber 41 of the screw portions 23r and 25r is caused by the pressing surface 252cb. Since the end portion on the side is closed, it is possible to prevent the flash from entering the control valve accommodating chamber 41 from the end portions of the screw portions 23r and 25r.

しかも、このような円環状部材２５２の押し当て面２５２ｃｂは、これに対向する段差部２３ａ及び支持部本体２５１の間に、図４（ａ）に示すような隙間Ｃｖが僅かに生じたとしても、図４（ｂ）の変形例の如き押し当て面１２５２ｃｂがねじ部２３ｒ、２５ｒに対して直交する場合での隙間Ｃｖに比べて、隙間Ｃｖをばりなどの異物が通過するのを抑制することができる。 Moreover, the pressing surface 252cb of the annular member 252 has a slight gap Cv as shown in FIG. 4A between the stepped portion 23a and the support portion main body 251 facing the pressing surface 252cb. As compared with the gap Cv in the case where the pressing surface 1252cb is orthogonal to the screw parts 23r and 25r as in the modification of FIG. 4B, it is possible to suppress the passage of foreign matter such as a flash through the gap Cv. Can do.

軸方向の隙間Ｃｖが同じ場合において、図４（ａ）に示す本実施形態による隙間Ｃｖによる実長Ｃｂは、Ｃｖ×ｓｉｎθと小さくでき、隙間の最短距離を小さく抑えることができるからである。なお、図４（ａ）において、角度θは、押し当て面２５２ｃｂが燃料噴射弁１の軸線１ｊに対して径方向外側に傾斜する傾斜角であり、押し当て面２５２ｃｂは環状内側に向けて縮径するようになっている。図４（ａ）及び図（ｂ）において、「ｄ」はばりの大きさを表しており、図中の実線あるいは二点鎖線で示される矢印はばりの流出方向を模式的に示している。 This is because when the axial gap Cv is the same, the actual length Cb by the gap Cv according to this embodiment shown in FIG. 4A can be reduced to Cv × sin θ, and the shortest distance of the gap can be kept small. 4A, the angle θ is an inclination angle at which the pressing surface 252cb is inclined radially outward with respect to the axis 1j of the fuel injection valve 1, and the pressing surface 252cb is contracted toward the annular inner side. It is designed to have a diameter. In FIG. 4A and FIG. 4B, “d” represents the size of the flash, and the arrow indicated by the solid line or the two-dot chain line in the drawing schematically shows the flow direction of the flash.

言い換えると、本実施形態によると、図３に示す如く円環状部材２５２の押し当て面２５２ｃｂが対向する内壁２３の段差部２３ａ及び支持部本体２５１を押し当てる状態に必ずしもなくとも、図４（ａ）の如きばりの通過を抑制する微細な隙間Ｃｂを容易に形成することができ、ひいては実質的に隙間なく接しているのと同じ状態とすることが可能となる。

また、以上説明した本実施形態では、円環状部材２５２において拡径環状部２５２ｃは、ねじ部２５ｒ、２３ｒを挟んで内壁２３の段差部２３ａ及び支持部本体２５１を押し当てる押し当て面２５２ｃｂを有している。 In other words, according to the present embodiment, as shown in FIG. 3, the pressing surface 252 cb of the annular member 252 does not necessarily press the stepped portion 23 a of the inner wall 23 and the support portion main body 251, as shown in FIG. ) Can be easily formed, and as a result, it can be made to be in the same state as being in contact with substantially no gap.

In the present embodiment described above, the diameter-enlarged annular portion 252c of the annular member 252 has a pressing surface 252cb that presses the stepped portion 23a of the inner wall 23 and the support portion main body 251 with the screw portions 25r and 23r interposed therebetween. is doing.

これによると、拡径環状部２５２ｃは、ねじ部２５ｒ、２３ｒの制御弁収容室４１側の端部、及び上記端部を挟む内壁２３の段差部２３ａ及び支持部本体２５１の周辺部分２３ｂを、押し当て面２５２ｃｂで押し当てることができる。したがって、拡径環状部２５２ｃの押し当て面２５２ｃｂによって上記ねじ部２５ｒ、２３ｒの制御弁収容室４１側の端部を確実に塞ぐことができるのである。 According to this, the enlarged diameter annular portion 252c includes the end portions of the screw portions 25r, 23r on the control valve accommodating chamber 41 side, the step portion 23a of the inner wall 23 sandwiching the end portions, and the peripheral portion 23b of the support body 251. It can be pressed by the pressing surface 252cb. Therefore, the end portions of the screw portions 25r and 23r on the control valve housing chamber 41 side can be reliably closed by the pressing surface 252cb of the diameter-enlarged annular portion 252c.

また、以上説明した本実施形態では、上記拡径環状部２５２ｃが封止機能を果たす円環状部材２５２は、支持部本体２５１に一体的に形成される構成としている。これによると、図３の円筒壁部２２の内壁２３に支持部材２５をねじ嵌合する組付け状態に示めされるように、支持部材２５（支持部本体２５１及び円環状部材２５２）を、上記内壁２３にねじ嵌合する組付け作業と、ねじ部２５ｒ、２３ｒの上記端部を塞ぐ封止作業とが同時に行なえるので、優れた生産性を有する燃料噴射弁１を得ることができる。 Further, in the present embodiment described above, the annular member 252 in which the diameter-enlarged annular portion 252c performs a sealing function is formed integrally with the support portion main body 251. According to this, as shown in the assembled state in which the support member 25 is screwed to the inner wall 23 of the cylindrical wall portion 22 in FIG. 3, the support member 25 (the support portion main body 251 and the annular member 252) Since the assembly operation for screwing the inner wall 23 and the sealing operation for closing the end portions of the screw portions 25r, 23r can be performed simultaneously, the fuel injection valve 1 having excellent productivity can be obtained.

さらに、上記拡径環状部２５２ｃを有する円環状部材２５２を、非磁性材料で形成する構成としているので、固定コア２９及び弁体３０の可動コア部３０ｄで構成される磁気回路から、支持部本体２５１側への磁束の漏れを防止するのが容易となる。それ故に、上記弁体２０の可動コア部３０ｄ及び固定コア２９間に作用する磁気吸引力を高めることが可能となるのである。 Furthermore, since the annular member 252 having the above-mentioned enlarged diameter annular portion 252c is configured to be formed of a nonmagnetic material, the support body is formed from the magnetic circuit composed of the fixed core 29 and the movable core portion 30d of the valve body 30. It is easy to prevent leakage of magnetic flux to the 251 side. Therefore, the magnetic attractive force acting between the movable core portion 30d of the valve body 20 and the fixed core 29 can be increased.

またさらに、支持部材２５の押し当て面２５２ｃｂを形成する円環状部材２５２は、内壁２３を形成するロアボデー３の材料より硬度の低い材料を使用しているので、ばり発生の際、押し当て面２５２ｃｂに噛み込ませ、ひいては当該ばりを効果的に封入することもできる。 Furthermore, since the annular member 252 forming the pressing surface 252cb of the support member 25 uses a material having a lower hardness than the material of the lower body 3 forming the inner wall 23, the pressing surface 252cb It is also possible to effectively enclose the flash.

上述した構成の燃料噴射弁１の作動について説明する。コイル２８への非通電（電力供給停止）時においては、弁体３０がスプリング４３の付勢力によりオリフィスプレート５の弁座５１に押し付けられ、これによって弁体３０のボーヅ弁３１が弁座５１に着座し、圧力制御室５０から電磁弁収容室４１へ排出される燃料（以下、リーク燃料という）の流れが遮断さる。また、コモンレールより供給される高圧燃料は、内部通路１７及び燃料通路２１を通じて圧力制御室５０へ供給されると共に、燃料通路１１、１４を通じてノズル部内の燃料溜まり部１３に蓄えられ、燃料通路１５を経由し、噴孔１２側へ供給される。圧力制御室５０はコモンレールからの燃料圧力と同一の圧力に維持されている。このとき、圧力制御室５０に蓄えられている燃料の圧力により制御ピストン４を介してノズルニードル８を噴孔閉塞方向へ付勢する力（以下、第１の力）と、ノズルニードルプリング２４がノズルニードル８を噴孔閉塞方向へ付勢する力（以下、第２の力）との和は、燃料溜まり部１３及びノズルニードル８のシート部８ｃ近傍の燃料の圧力によりノズルニードル８が噴孔開放方向へ受ける力（以下、第３の力）よりも大きくなっている。そのため、噴孔１２は閉塞され、噴孔１２から燃料は噴射されない。 The operation of the fuel injection valve 1 configured as described above will be described. When the coil 28 is not energized (power supply is stopped), the valve body 30 is pressed against the valve seat 51 of the orifice plate 5 by the biasing force of the spring 43, whereby the bow valve 31 of the valve body 30 is pressed against the valve seat 51. The flow of fuel (hereinafter referred to as leak fuel) that is seated and discharged from the pressure control chamber 50 to the electromagnetic valve housing chamber 41 is cut off. The high-pressure fuel supplied from the common rail is supplied to the pressure control chamber 50 through the internal passage 17 and the fuel passage 21 and is stored in the fuel reservoir 13 in the nozzle portion through the fuel passages 11 and 14. Via, it is supplied to the nozzle hole 12 side. The pressure control chamber 50 is maintained at the same pressure as the fuel pressure from the common rail. At this time, a force (hereinafter referred to as a first force) that urges the nozzle needle 8 in the nozzle hole closing direction via the control piston 4 by the pressure of the fuel stored in the pressure control chamber 50, and the nozzle needle pulling 24 are The sum of the force (hereinafter referred to as the second force) for urging the nozzle needle 8 in the direction of closing the nozzle hole is that the nozzle needle 8 is sprayed by the fuel pressure in the vicinity of the fuel reservoir 13 and the seat portion 8c of the nozzle needle 8. It is larger than the force received in the opening direction (hereinafter referred to as third force). Therefore, the injection hole 12 is closed and fuel is not injected from the injection hole 12.

コイル２８へ通電（電力供給）が開始される（以下、燃料噴射弁１の開時という）と、コイル２８に電磁力が発生し、固定コア２９と弁体３０側の可動コア部３０ｄの両磁極面間に発生する磁気吸引力により、可動コア部３０ｄつまり弁体３０が固定コア２９方向に吸引される。磁気吸引力がスプリング４３の付勢力より大きくなると、弁体３０が固定コア２９方向へ移動する。そのため、弁体３０のうちのボール弁３１に作用する圧力制御室５０内の燃料圧力により図２中上方へ移動し、オリフィスプレート５の弁座５１から離座する。上記ボール弁３１が弁座５１から離座すると、圧力制御室５０と弁座５１側が連通される。圧力制御室５０及び弁座５１間の途中にある出口オリフィス２７を、高圧の燃料が通過するによって減圧され、減圧された燃料がリーク燃料として弁座５１側へ流入する。 When energization (power supply) is started to the coil 28 (hereinafter referred to as when the fuel injection valve 1 is opened), electromagnetic force is generated in the coil 28, and both the fixed core 29 and the movable core portion 30 d on the valve body 30 side are generated. The movable core portion 30 d, that is, the valve body 30 is attracted toward the fixed core 29 by the magnetic attraction force generated between the magnetic pole surfaces. When the magnetic attractive force becomes larger than the urging force of the spring 43, the valve body 30 moves toward the fixed core 29. Therefore, it moves upward in FIG. 2 due to the fuel pressure in the pressure control chamber 50 acting on the ball valve 31 of the valve body 30 and separates from the valve seat 51 of the orifice plate 5. When the ball valve 31 is separated from the valve seat 51, the pressure control chamber 50 and the valve seat 51 are communicated. The high pressure fuel passes through the outlet orifice 27 in the middle between the pressure control chamber 50 and the valve seat 51, so that the pressure is reduced, and the reduced pressure fuel flows into the valve seat 51 as leak fuel.

高圧の燃料が弁座５１側つまり電磁弁収容室４１へ流入すると、圧力制御室５０内の燃料圧力が低下し、ノズルニードル８を噴孔閉塞方向へ付勢する第１の力が減少する。こうした第１及び第２の噴孔閉塞方向へ付勢する力の和よりも、ノズルニードル８の噴孔開放方向へ作用する第３の力が大きくなると、ノズルニードル８は上方へリフトする。ノズルニードル８がリフトすると、噴孔１２が開放され、噴孔１２から燃料が噴射される。 When high-pressure fuel flows into the valve seat 51 side, that is, the electromagnetic valve housing chamber 41, the fuel pressure in the pressure control chamber 50 decreases, and the first force that urges the nozzle needle 8 in the nozzle hole closing direction decreases. When the third force acting in the nozzle hole opening direction of the nozzle needle 8 becomes larger than the sum of the forces urging in the first and second nozzle hole closing directions, the nozzle needle 8 lifts upward. When the nozzle needle 8 is lifted, the nozzle hole 12 is opened, and fuel is injected from the nozzle hole 12.

燃料の噴射が終了すると、即ち上記制御回路によって決定されたエンジンの運転状態に応じて最適な噴射量に相当する電磁弁６の開弁期間が終了する（以下、燃料噴射弁１の閉時という）と、コイル２８への通電が停止される。この通電停止によって、コイル２８の電磁力が消失し、固定コア２９及び可動コア３０ｄ間に作用する磁気吸引力が生じなくなるため、弁体３０はスプリング４３の付勢力より図中下方へ移動する。そして、弁体３０のボール弁３１が弁座５１に着座し、圧力制御室５０から弁座５１側へのリーク燃料の流通を遮断する。弁座５１側、即ち電磁弁収容室４１へのリーク燃料の流通が遮断されると、圧力制御室５０内の燃料圧力が増大し、上記第１の力が増加する。そうした第１及び第２の噴孔閉塞方向へ付勢する力の和が、ノズルニードル１２５の噴孔開放方向へ作用する第３の力よりも大きくなると、ノズルニードル１２５は下方へ移動する。そして、噴孔１２４が閉塞されると、噴孔１２４から燃料の噴射が終了する。 When the fuel injection is completed, that is, the valve opening period of the electromagnetic valve 6 corresponding to the optimal injection amount is ended according to the engine operating state determined by the control circuit (hereinafter referred to as the fuel injection valve 1 being closed). ) And energization of the coil 28 is stopped. By stopping the energization, the electromagnetic force of the coil 28 disappears and the magnetic attractive force acting between the fixed core 29 and the movable core 30d is not generated, so that the valve body 30 moves downward in the figure by the urging force of the spring 43. Then, the ball valve 31 of the valve body 30 is seated on the valve seat 51, and the flow of leaked fuel from the pressure control chamber 50 to the valve seat 51 side is blocked. When the flow of leaked fuel to the valve seat 51 side, that is, the electromagnetic valve housing chamber 41 is interrupted, the fuel pressure in the pressure control chamber 50 increases and the first force increases. When the sum of the forces urging in the first and second nozzle hole closing directions becomes larger than the third force acting in the nozzle hole opening direction of the nozzle needle 125, the nozzle needle 125 moves downward. When the injection hole 124 is closed, the fuel injection from the injection hole 124 is completed.

以上説明した本実施形態では、燃料噴射弁１の開期間において、圧力制御室５０から弁座５１側へ流入するリーク燃料は、弁座５１から連絡通路４５及び連通孔４４を通じて電磁弁収容室４１に流出することになるのだが、上記ねじ部２３ｒ、２５ｒから電磁弁収容室４１へのばり侵入防止が図られているので、そのようなばりが電磁弁収容室４１に混入することはない。それ故に、弁体３０のリフト量等を阻害することはなく、ひいては圧力制御室５０内の燃料圧力の変化特性を阻害することはない。したがって、電磁弁収容室４１へのばり侵入に起因して噴孔２１から噴射される燃料噴射量などの燃料噴射特性が変化してしまうのを防止することができる。 In the present embodiment described above, the leaked fuel that flows from the pressure control chamber 50 to the valve seat 51 side during the open period of the fuel injection valve 1 flows from the valve seat 51 through the communication passage 45 and the communication hole 44 to the electromagnetic valve housing chamber 41. However, since the intrusion prevention from the screw portions 23r and 25r to the electromagnetic valve housing chamber 41 is prevented, such a flash does not enter the electromagnetic valve housing chamber 41. Therefore, the lift amount or the like of the valve body 30 is not obstructed, and consequently the change characteristic of the fuel pressure in the pressure control chamber 50 is not obstructed. Therefore, it is possible to prevent the fuel injection characteristics such as the fuel injection amount injected from the injection hole 21 from being changed due to the entry of the flash into the electromagnetic valve housing chamber 41.

以上説明した本実施形態では、燃料噴射弁１は、支持部材２５と内筒壁部２２の内壁２３がねじ嵌合することにより、支持部材２５と、ハウジング２の一部であるオリフィスプレート５が密着する構成としている。かかる装置１では、例えば支持部材２５とオリフィスプレート５との密着性を高める必要がある場合がある。この場合には、支持部材２５と上記内壁２３とのねじ嵌合による締め付け軸力を高めることが必要となる。当該軸力を増加すると、ばり発生が懸念される。しかしながら、上記装置１に、支持部材２５の円環状部材２５２に封止機能を持たせるという本発明の技術を適用することにより、支持部材２５と内壁２３とのねじ嵌合による締め付け軸力の増加と、ねじ部２３ｒ、２５ｒから電磁弁収容室４１へのばり侵入防止との両立を図ることができる。 In the present embodiment described above, the fuel injection valve 1 includes the support member 25 and the orifice plate 5 which is a part of the housing 2 by screwing the support member 25 and the inner wall 23 of the inner cylindrical wall portion 22. The structure is in close contact. In such a device 1, for example, it may be necessary to improve the adhesion between the support member 25 and the orifice plate 5. In this case, it is necessary to increase the tightening axial force by screw fitting between the support member 25 and the inner wall 23. When the axial force is increased, there is a concern about the occurrence of flash. However, by applying the technique of the present invention in which the annular member 252 of the support member 25 is provided with a sealing function to the device 1, the tightening axial force is increased due to the screw fitting between the support member 25 and the inner wall 23. In addition, it is possible to achieve both the prevention of flash intrusion from the screw portions 23r and 25r into the electromagnetic valve housing chamber 41.

（第２実施形態）
第２実施形態を図５に示す。第２実施形態では、支持部材２５側及び内壁２３側のねじ部２３ｒ、２５ｒの双方のうち、特定のねじ２５ｒに環状の溝部５２を設けた一例を示すものである。図５は本実施形態による燃料噴射弁１に係わる特徴的構成を示すものであり、図６はねじ嵌合により生じるおそれのあるばりの移動例を説明するものである。 (Second Embodiment)
A second embodiment is shown in FIG. In the second embodiment, an example in which an annular groove 52 is provided in a specific screw 25r out of both the screw portions 23r and 25r on the support member 25 side and the inner wall 23 side is shown. FIG. 5 shows a characteristic configuration related to the fuel injection valve 1 according to the present embodiment, and FIG. 6 illustrates an example of the movement of a flash that may be caused by screw fitting.

図５に示すように、支持部材２５は、支持部本体２２５１と、円環状部材２２５２とを備えており、支持部本体２２５１の雄ねじ２５ｒは、上記ねじ部２３ｒ、２５ｒにおいて電磁弁収容室４１側の端部に相当する部位で、雄ねじ２５ｒが切欠かいた上記環状の溝部５２が設けられている。 As shown in FIG. 5, the support member 25 includes a support portion main body 2251 and an annular member 2252, and the male screw 25 r of the support portion main body 2251 is on the electromagnetic valve housing chamber 41 side in the screw portions 23 r and 25 r. The annular groove portion 52 in which the male screw 25r is notched is provided at a portion corresponding to the end portion.

なお、この溝部５２の形状は、これに限らず、すくなくとも雄ねじ２５ｒの頂部を除いた形状、雄ねじ２５ｒに相当する部分を切欠いたもの、あるいは雄ねじ２５ｒ部分以上の径方向内側に切欠いたものであってもよく、少なくとも雄ねじ２５ｒの頂部を除いた溝部形状であればいずれでもよい。 The shape of the groove 52 is not limited to this, and is at least a shape excluding the top of the male screw 25r, a portion corresponding to the male screw 25r, or a portion notched radially inward of the male screw 25r or more. It may be any groove shape as long as it excludes at least the top of the male screw 25r.

このような構成によると、支持部材２５及び内筒壁部２２の内壁２３のねじ嵌合時においてねじ部２３ｒ、２５ｒにばりが発生したとしても、図６に示すように、「特定のねじ部」である雄ねじ２５ｒに設けた環状の溝部５２内に、上記ばりを捕捉することが可能となる。そのような溝部５２によって、上記ねじ部２３ｒ、２５ｒの電磁弁収容室４１側の端部の先にある制御弁収容室４１へばりが排出されるのを抑制することができる。その結果、ねじ部２３ｒ、２５ｒの制御弁収容室４１側の端部から制御弁収容室４１へばりが侵入するのが防止される。ここで、環状の溝部５２はねじ部２３ｒ、２５ｒ内に残留するばりを捕捉する捕捉機能を果たす。 According to such a configuration, even when flash occurs on the screw portions 23r and 25r when the support member 25 and the inner wall 23 of the inner cylindrical wall portion 22 are screwed together, as shown in FIG. It is possible to capture the flash in an annular groove 52 provided on the male screw 25r. By such a groove portion 52, it is possible to prevent the flash from being discharged to the control valve housing chamber 41 at the tip of the end portions of the screw portions 23r and 25r on the electromagnetic valve housing chamber 41 side. As a result, it is possible to prevent the burr from entering the control valve accommodating chamber 41 from the end of the screw portions 23r and 25r on the control valve accommodating chamber 41 side. Here, the annular groove 52 fulfills a capturing function of capturing the flash remaining in the threaded portions 23r and 25r.

このような構成においても、第１実施形態とほぼ同様な効果を得ることができる。 Even in such a configuration, substantially the same effect as in the first embodiment can be obtained.

また、本実施形態において、円環状部材２２５２の形状は、支持部本体２２５１の可動コア部３０ｄ側の端部（図中の上端部）２５１ａに形成され、ねじ部２３ｒ、２５ｒの径より小さい径の内周を有する段差部２５１ｄに挿入可能な形状に形成されている。このような円環状部材２２５２は、ねじ部２３ｒ、２５ｒのねじ嵌合と連動させる必要はない。 Further, in the present embodiment, the shape of the annular member 2252 is formed on the end portion (upper end portion in the drawing) 251a on the movable core portion 30d side of the support portion main body 2251 and has a diameter smaller than the diameter of the screw portions 23r and 25r. It is formed in a shape that can be inserted into a step portion 251d having an inner circumference. Such an annular member 2252 need not be interlocked with the screw fitting of the screw portions 23r and 25r.

以上説明した本実施形態において、環状の溝部５２によって、特定のねじ２５ｒにおいて頂部などの径方向の一部のみが切欠かれているのではなく、溝部５２に対応する部位のねじ２５ｒが切欠かれていることが好ましい。このような構成によると、互いにねじ嵌合ねじ部２３ｒ、２５ｒにおいてする相手のねじ２３ｒに対応する特定のねじ２５ｒが取り除かれているので、発生したばりを環状の溝部５２内に効果的に捕捉すると共に、捕捉されたばりを効果的に溜める空間容積を確保することができる。 In the present embodiment described above, the annular groove 52 does not cut out only a part in the radial direction such as the top of the specific screw 25r, but cuts out the screw 25r corresponding to the groove 52. Preferably it is. According to such a configuration, since the specific screw 25r corresponding to the mating screw 23r in the screw fitting screw portions 23r and 25r is removed, the generated flash is effectively captured in the annular groove portion 52. In addition, it is possible to secure a space volume for effectively collecting the captured flash.

（第３実施形態）
第３実施形態を図７に示す。第３実施形態は第１実施形態の変形例である。第３実施形態では、支持部材２５において円環状部材２５２に、押し当て面２５２ｃｂを有する拡径環状部２５２ｃを設けると共に、支持部本体２５１の雄ねじ２５ｒに、環状の溝部５２を設けた一例を示すものである。 (Third embodiment)
A third embodiment is shown in FIG. The third embodiment is a modification of the first embodiment. In the third embodiment, an example is shown in which the annular member 252 in the support member 25 is provided with a diameter-enlarged annular portion 252c having a pressing surface 252cb, and an annular groove portion 52 is provided in the external thread 25r of the support portion main body 251. Is.

図７に示すように、支持部材２５は、支持部本体２５１と、円環状部材２５２とから構成されており、支持部本体２５１は、その雄ねじ２５ｒの電磁弁収容室４１側の端部に相当する部位に、環状の溝部５２を備えると共に、円環状部材２５２は、押し当て面２５２ｃｂを有する拡径環状部２５２ｃを備えている。 As shown in FIG. 7, the support member 25 includes a support portion main body 251 and an annular member 252, and the support portion main body 251 corresponds to the end of the male screw 25 r on the electromagnetic valve housing chamber 41 side. The annular member 252 is provided with a diameter-enlarged annular portion 252c having a pressing surface 252cb.

このような構成によると、支持部材２５及び内筒壁部２２の内壁２３のねじ嵌合時においてねじ部２３ｒ、２５ｒにばりが発生したとしても、「特定のねじ部」である雄ねじ２５ｒに設けた環状の溝部５２内に、上記ばりを捕捉することができる。これにより、ねじ部２３ｒ、２５ｒにおいて溝部５２から先の上記端部側のねじ部部分へ、ばりが排出されるのを抑制することができる。 According to such a configuration, even if a flash occurs in the screw parts 23r and 25r when the support member 25 and the inner wall 23 of the inner cylinder wall part 22 are screwed, the male screw 25r that is a “specific screw part” is provided. The flash can be captured in the annular groove 52. Thereby, it can suppress that a flash is discharged | emitted from the groove part 52 in the thread part 23r, 25r to the thread part part of the said edge part side ahead.

したがって、ねじ部２３ｒ、２５ｒの電磁弁収容室４１側の端部から電磁弁収容室４１へばりが侵入するのを効果的に防止することができる。 Therefore, it is possible to effectively prevent the flashes from entering the electromagnetic valve accommodating chamber 41 from the ends of the screw portions 23r and 25r on the electromagnetic valve accommodating chamber 41 side.

（第４実施形態）
第４実施形態を図８に示す。第４実施形態は第２実施形態の変形例である。第４実施形態では、雄ねじ２５ｒに環状の溝部５２が設けられた支持部本体２２５１において溝部５２の側壁のうち、上記端部２５１ａ近傍の特定部分２５１ｂａに、ねじ部２３ｒ、２５を挟んで内壁２３の段差部２３ａを押し当てる押し当て面２５１ｂｂを設けた一例を示すものである。 (Fourth embodiment)
A fourth embodiment is shown in FIG. The fourth embodiment is a modification of the second embodiment. In the fourth embodiment, in the support body 2251 in which the male screw 25r is provided with the annular groove portion 52, the inner wall 23 with the screw portions 23r and 25 sandwiched between the specific portion 251ba in the vicinity of the end portion 251a of the side wall of the groove portion 52. The example which provided the pressing surface 251bb which presses the level | step-difference part 23a of this is shown.

図８に示すように、特定のねじ部としての雄ねじ２５ｒは、支持部本体２２５１の外周部２５１ｂにおいて環状の溝部５２の図中の下端側の側壁を貫通して形成されているが、環状の溝部５２の図中の上端側の側壁、即ち上記特定部分２５１ｂａ側に相当する側壁には形成されていない。一方、内壁２３の段差部２３ａは図中の上方へ貫通するように雌ねじ２３ｒが形成されている。 As shown in FIG. 8, the male screw 25r as a specific screw portion is formed in the outer peripheral portion 251b of the support portion main body 2251 so as to penetrate the side wall on the lower end side in the figure of the annular groove portion 52. The groove 52 is not formed on the side wall on the upper end side in the drawing, that is, the side wall corresponding to the specific portion 251ba side. On the other hand, a female screw 23r is formed in the step portion 23a of the inner wall 23 so as to penetrate upward in the drawing.

さらに、支持部本体２２５１の上記特定部分２５１ｂａは環状内側に向けて縮径して形成されており、特定部分２５１ｂａの押し当て面２５１ｂｂは、雌ねじ２３ｒの外側の部分２３ｂを押し当てるように接している。 Further, the specific portion 251ba of the support portion main body 2251 is formed to have a reduced diameter toward the inner side of the ring, and the pressing surface 251bb of the specific portion 251ba is in contact with the outer portion 23b of the female screw 23r. Yes.

このよう構成によると、特定部分２５１ｂａの押し当て面２５１ｂｂは、第１実施形態で説明の封止機能を果たすことができる。しかも、上記特定部分２５１ｂａは、支持部本体２２５１の雄ねじ２５ｒを切欠いた環状の溝部５２の特定の側壁に形成されるので、ばりを捕捉する捕捉機能も同時に果たすことができるのである。 According to such a configuration, the pressing surface 251bb of the specific portion 251ba can fulfill the sealing function described in the first embodiment. Moreover, since the specific portion 251ba is formed on a specific side wall of the annular groove portion 52 in which the male screw 25r of the support portion main body 2251 is notched, it can simultaneously perform a capturing function for capturing a flash.

（他の実施形態）
以上、本発明の複数の実施形態について説明したが、本発明はそれらの実施形態に限定して解釈されるものではなく、その要旨を逸脱しない範囲内において種々の実施形態に適用することができる。 (Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. .

（１）例えば以上説明した本実施形態では、ねじ部２３ｒ、２５ｒのばりの流出を防止するために、ねじ部の電磁弁収容室側の端部を塞ぐ封止機能を、支持部材２５及び円筒壁部２２の内壁２３のうち、支持部材２５に設けたが、内壁２３に設けてもよい。 (1) For example, in the present embodiment described above, the sealing function for closing the end of the screw portion on the side of the electromagnetic valve housing chamber is provided in order to prevent the flash of the screw portions 23r and 25r from flowing out. Of the inner wall 23 of the wall portion 22, the support member 25 is provided, but the inner wall 23 may be provided.

（２）以上説明した第２〜第４実施形態では、支持部材２５側及び内壁２３側の双方のねじ部２３ｒ、２５ｒのうち、「特定のねじ」として雄ねじ２５ｒに、環状の溝部５２を設ける構成としたが、これに限らず、雄ねじ２５ｒ及び雌ねじ２３ｒの少なくともいずれかに上記環状の溝部５２を設けるものであればよい。 (2) In the second to fourth embodiments described above, the annular groove 52 is provided in the male screw 25r as a “specific screw” among the screw portions 23r, 25r on both the support member 25 side and the inner wall 23 side. Although it was set as the structure, it is not restricted to this, What is necessary is just to provide the said annular groove part 52 in at least any one of the external thread 25r and the internal thread 23r.

本発明の第１実施形態による燃料噴射装置を示す断面図である。It is sectional drawing which shows the fuel-injection apparatus by 1st Embodiment of this invention. 本発明の特徴構成を示す図であって、図２中の電磁弁周りを示す断面図である。It is a figure which shows the characteristic structure of this invention, Comprising: It is sectional drawing which shows the solenoid valve periphery in FIG. 図２中の弁ハウジング及びハウジングのねじ嵌合に係わる特徴的構成を示す図であって、ハウジングの内壁に弁ハウジングをねじ嵌合した状態を示す断面図である。It is a figure which shows the characteristic structure regarding screw fitting of the valve housing and housing in FIG. 2, Comprising: It is sectional drawing which shows the state which screw-fitted the valve housing to the inner wall of the housing. ねじ嵌合により生じるおそれのあるばりの移動例を説明する模式図であって、図４（ａ）は図３の特徴的構成を適用した場合を示す断面図、図４（ｂ）は他の特徴的構成を採用した変形例による場合を示す断面図である。FIGS. 4A and 4B are schematic diagrams for explaining an example of the movement of a flash that may be caused by screw fitting, in which FIG. 4A is a cross-sectional view showing the case where the characteristic configuration of FIG. 3 is applied, and FIG. It is sectional drawing which shows the case by the modification which employ | adopted characteristic structure. 第２実施形態による燃料噴射装置に係わる特徴的構成を示す断面図である。It is sectional drawing which shows the characteristic structure concerning the fuel-injection apparatus by 2nd Embodiment. 図５の特徴的構成を適用した場合において、ねじ嵌合により生じるおそれのあるばりの移動例を説明する断面図である。FIG. 6 is a cross-sectional view illustrating an example of the movement of a flash that may occur due to screw fitting when the characteristic configuration of FIG. 5 is applied. 第３実施形態による燃料噴射装置に係わる特徴的構成を示す断面図である。It is sectional drawing which shows the characteristic structure concerning the fuel-injection apparatus by 3rd Embodiment. 第４実施形態による燃料噴射装置に係わる特徴的構成を示す断面図である。It is sectional drawing which shows the characteristic structure concerning the fuel-injection apparatus by 4th Embodiment.

Explanation of symbols

１燃料噴射弁（燃料噴射装置）
２ノズル部
３ロアボデー（ハウジング）
４制御ピストン
５オリフィスプレート（弁座部材）
６電磁弁（制御弁）
７ノズルボデー（ハウジング）
８ノズルニードル
８ａ摺動部
８ｂ軸部
８ｃシート部
９リテーニングナット（締結部材）
１０ガイド孔（ノズルニードル収容孔）
１０ａ摺動孔
１０ｂ燃料通路形成孔
１０ｃシート面部（弁座部）
１１燃料通路
１２噴孔
１３燃料溜まり部
１４燃料通路
１５燃料通路
１６配管継手部
１７内部通路
１８バーフィルタ
１９プレッシャピン部
２０シリンダ孔
２１燃料通路
２２円筒壁部（ハウジング）
２３内壁
２３ａ段差部
２３ｂ雌ねじより外側の部分
２３ｒ雌ねじ（ねじ部）
２３圧力制御室
２４ノズルニードルスプリング
２５支持部材（弁ハウジング）
２５１支持部本体
２５２円環状部材
２５２ａ支持孔
２５２ｂ連通孔
２５２ｃ拡径環状部
２５２ｃｂ押し当て面
２６入口オリフィス
２７出口オリフィス（連通路）
２８コイル
２９固定コア
３０弁体
３０ｂ貫通孔
３０ｄ可動コア部
３０ｊ弁体軸部
３１ボール弁
３２リテーニングナット
３３ボビン
３４樹脂材
３５中心孔
３６エンドハウジング（弁ハウジング）
３７排出通路
３８コネクタ
３９ターミナル
４０接続端子
４１電磁弁収容室（制御弁収容室）
４２支持孔
４３スプリング
４４連通孔
４５連絡通路
５０圧力制御室
５１弁座 1 Fuel injection valve (fuel injection device)
2 Nozzle 3 Lower body (housing)
4 Control piston 5 Orifice plate (valve seat member)
6 Solenoid valve (control valve)
7 Nozzle body (housing)
8 Nozzle needle 8a Sliding part 8b Shaft part 8c Seat part 9 Retaining nut (fastening member)
10 Guide hole (Nozzle needle accommodation hole)
10a Sliding hole 10b Fuel passage forming hole 10c Seat surface part (valve seat part)
DESCRIPTION OF SYMBOLS 11 Fuel passage 12 Injection hole 13 Fuel accumulation part 14 Fuel passage 15 Fuel passage 16 Pipe joint part 17 Internal passage 18 Bar filter 19 Pressure pin part 20 Cylinder hole 21 Fuel path 22 Cylindrical wall part (housing)
23 inner wall 23a step part 23b part outside female thread 23r female thread (thread part)
23 Pressure control chamber 24 Nozzle needle spring 25 Support member (valve housing)
251 Supporting part body 252 Annular member 252a Supporting hole 252b Communication hole 252c Expanded annular part 252cb Pressing surface 26 Inlet orifice 27 Outlet orifice (communication path)
28 Coil 29 Fixed core 30 Valve body 30b Through hole 30d Movable core portion 30j Valve body shaft portion 31 Ball valve 32 Retaining nut 33 Bobbin 34 Resin material 35 Center hole 36 End housing (valve housing)
37 Discharge passage 38 Connector 39 Terminal 40 Connection terminal 41 Solenoid valve storage chamber (control valve storage chamber)
42 support hole 43 spring 44 communication hole 45 communication passage 50 pressure control chamber 51 valve seat

Claims

A valve housing that supports the valve body of the control valve so as to be axially movable;
A housing that houses the valve body and the valve housing therein and has an inner wall for screwing the valve housing;
With
In the fuel injection device for forming a control valve housing chamber inside the inner wall by screwing the valve housing to the inner wall,
Both the valve housing and the inner wall are
A threaded portion for screwing the two together,
A sealing part that is provided on a specific member of the two and closes an end of the screw part on the control valve housing chamber side;
A fuel injection device comprising:

The said sealing part has a pressing surface which presses the said inner wall and the said valve housing on both sides of the edge part by the side of the said control valve accommodation chamber of the said thread part. Fuel injection device.

The pressing surface is formed on the specific member by being inclined with respect to the axial direction,
3. The fuel according to claim 2, wherein the pressing surface and the facing portion to which the pressing surface is pressed are arranged without a gap in the axial direction or at a predetermined interval. Injection device.

A coil including a fixed core that attracts the valve body by a magnetic force generated by a current supplied to the coil;
The sealing portion is an annular member that is provided in the valve housing as the specific member and has an annular shape, and the annular member is integrated with an end of the valve housing on the fixed core side. The fuel injection device according to any one of claims 1 to 3, wherein the fuel injection device is formed.

The fuel injection device according to any one of claims 1 to 4, wherein the sealing portion is made of a nonmagnetic material.

Among the two screw portions, the specific screw portion is provided at an end of the specific screw portion on the control valve accommodating chamber side, and includes an annular groove portion excluding at least the top portion of the screw portion. The fuel injection device according to any one of claims 1 to 5, wherein:

A valve housing that supports the valve body of the control valve so as to be axially movable;
A housing that houses the valve body and the valve housing therein and has an inner wall for screwing the valve housing;
With
In the fuel injection device for forming a control valve housing chamber inside the inner wall by screwing the valve housing to the inner wall,
Both the valve housing and the inner wall are
A threaded portion for screwing the two together,
Among the two screw parts, a specific screw part is provided at an end of the specific screw part on the control valve accommodating chamber side, and at least an annular groove part excluding a top part of the screw part,
A fuel injection device comprising:

The fuel injection device according to claim 6 or 7, wherein the threaded portion is cut out in the annular groove.

The inner wall of the housing includes a valve seat member having a valve seat on which the valve body is seated and separated,
The fuel injection device according to any one of claims 1 to 8, wherein the valve housing and the valve seat member are in close contact with each other by screw-fitting the valve housing and the inner wall.