WO1999001661A1 - Solenoid valve for fuel injectors - Google Patents

Solenoid valve for fuel injectors Download PDF

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Publication number
WO1999001661A1
WO1999001661A1 PCT/JP1998/002805 JP9802805W WO9901661A1 WO 1999001661 A1 WO1999001661 A1 WO 1999001661A1 JP 9802805 W JP9802805 W JP 9802805W WO 9901661 A1 WO9901661 A1 WO 9901661A1
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WO
WIPO (PCT)
Prior art keywords
core portion
solenoid valve
electromagnetic coil
armature
injection device
Prior art date
Application number
PCT/JP1998/002805
Other languages
French (fr)
Japanese (ja)
Inventor
Yuji Furuya
Kenichi Iino
Original Assignee
Zexel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zexel Corporation filed Critical Zexel Corporation
Publication of WO1999001661A1 publication Critical patent/WO1999001661A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring

Definitions

  • the present invention relates to a solenoid valve for a fuel injection device, and more particularly to a solenoid valve for a fuel injection device capable of setting a large suction force.
  • a plunger type A disk-type solenoid that can set a larger suction area than the conventional solenoid is generally used. That is, for the same outer diameter, the disk-type solenoid can set a larger suction area, so that the generated suction force can be increased. Therefore, it is relatively easily used when high responsiveness or high-pressure operation is required.
  • Japanese Patent Application Laid-Open Nos. Hei 8-189347 and Hei 8-210207 are available.
  • FIG. 3 is a longitudinal sectional view of a solenoid valve 1 for a fuel injection device.
  • the solenoid valve 1 for a fuel injection device has a core 2, an electromagnetic coil 3, a seal member 4, and a disk-shaped solenoid valve. It has a Machiya 1 and a $ 21 valve 6.
  • the core part 2 is made of a magnetic material, and the inner and outer diameter sides of the electromagnetic coil 3 are formed.
  • the center of the fuel passage 7 and the return spring 8 can be installed.
  • the electromagnetic coil 3 has a bobbin 10 to which a terminal 9 for energization is attached, and a coil 11 for generating a magnetomotive force by energization, and a magnetic circuit can be formed in the core 2.
  • the sealing member 4 is made of a non-magnetic material, and the magnetic path between the core 2 and the armature 15 is secured by blocking the magnetic paths on the inner peripheral side and the outer peripheral side of the core 2.
  • a seal is provided to prevent fuel from entering the electromagnetic coil 3 from the fuel passage 7 side.
  • the armature 5 is made of a magnetic material, forms a magnetic circuit with the core 2, and can be attracted to the electromagnetic coil 3 (core 2).
  • the dollar valve 6 is attached to the armature 5 and allows fuel to be injected directly into the intake pipe or the cylinder from the injection hole 13 of the valve seat 12.
  • the electromagnetic coil 3 is inserted into the core 2 from the first mater 5 side (the lower side in the figure), and the sealing member 4 is pressed into the core 2 after press-fitting. Perform full circumference welding.
  • ⁇ is the amount of magnetic flux (wb)
  • ⁇ is the magnetic permeability
  • S is the area of the suction part (the part where the core part 2 faces the armature 5 and the sealing member 4 is excluded)
  • V is the leakage coefficient It is.
  • the suction force F of the solenoid valve 1 for fuel injection device is the amount of magnetic flux? It is determined from this.
  • the saturation magnetic flux density of a magnetic material is determined, the maximum value of the magnetic flux is proportional to the cross-sectional area of the magnetic path.
  • the larger the magnetic path cross-sectional area the larger the attractive force F can be.
  • the sealing member 4 since the sealing member 4 has greatly tightened the magnetic path cross-sectional area of the core portion 2 facing the armature 5, that is, the portion of the sealing member 4 is the electromagnetic coil 3. Does not contribute to the suction action of the armature 5 due to the above, the usable suction force F and the magnetic path area are limited, and the conventional magnetic solenoid valve 1 for a fuel injection device has a large magnetic path cross-sectional area. Therefore, there is a problem that it is difficult to increase the suction force F.
  • the solenoid valve 1 for a fuel injection device cannot respond to a demand for further improvement in responsiveness or an increase in operable fuel pressure. There is.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a solenoid valve for a fuel injection device capable of obtaining a larger suction force than before.
  • Another object of the present invention is to provide a solenoid valve for a fuel injection device capable of obtaining a larger magnetic path area than ever before.
  • Another object of the present invention is to provide a solenoid valve for a fuel injection device that can set a large suction force without increasing the outer diameter.
  • Another object of the present invention is to provide a solenoid valve for a fuel injection device which can respond to requests for improved responsiveness and increased operable fuel pressure with the same outer diameter.
  • Another object of the present invention is to provide a solenoid valve for a fuel injection device capable of increasing the attraction force of an electromagnetic coil and realizing high responsiveness and good operability in a high fuel pressure state in the same space as before. Make it an issue. That is, according to the present invention, the sealing member reduces the magnetic path area between the electromagnetic coil and the armature, and if the magnetic path area of this portion is increased, it is necessary to obtain the attractive force even with the same magnetomotive force.
  • the first aspect of the present invention focuses on the fact that the core is made of a magnetic material, an electromagnetic coil that can form a magnetic circuit in the core, and a disk-shaped key that can be attracted to the core.
  • a solenoid valve for a fuel injection device comprising: a needle and a needle valve attached to the armature and capable of injecting fuel from an injection hole, wherein the core part is formed by an inner core part and an outer part.
  • An opening space is formed by opening one end of the inner core portion and the outer core portion on the side of the armature in the axial direction in a ring shape, and forming an opening space portion.
  • the electromagnetic coil is provided, and a sealing member made of a non-magnetic material is further provided to close the open space.
  • the outer diameter of the bracket is smaller than that of the electromagnetic coil.
  • a second aspect of the present invention relates to a core portion made of a magnetic material, an electromagnetic coil capable of forming a magnetic circuit in the core portion, a disk-type mechanism that can be attracted to the core portion, and a magnetic member.
  • a solenoid valve for a fuel injection device comprising: a core valve having an inner core portion and an outer core portion, wherein the core portion comprises an inner core portion and an outer core portion.
  • One end of the inner core portion and the outer core portion on the side of the armature in the axial direction is opened in a ring shape to form an opening space, and the electromagnetic coil is provided in the opening space, and the opening is formed.
  • a seal member made of a non-magnetic material is provided on the inner peripheral side of the space, and the outer core is located on the outer peripheral side of the open space, thereby closing the open space. This is a solenoid valve for a fuel injection device.
  • the inner core portion and the outer core portion are formed from separate members, and the inner core portion is formed into a hollow cylindrical shape, and the outer core portion is formed on the inner peripheral surface thereof by the opening space portion.
  • Can have a hollow cylindrical shape with a step that can form You.
  • An elastic tongue for improving the sealing performance can be formed on the seal member.
  • the split configuration for dividing the core portion into the inner core portion and the outer core portion can be assembled as a solenoid valve, and the cross-sectional area of the nonmagnetic seal member is reduced. If possible, any configuration can be adopted.
  • the seal member prevents fuel from entering the electromagnetic coil portion, secures a magnetic path, and reduces the cross-sectional area of the seal member.
  • the magnetic path area between the coil and the armature can be increased by that much, and the attraction force of the armature by the electromagnetic coil can be increased.
  • the electromagnetic coil it is possible to increase the attractive force of the electromagnetic coil with the same outer diameter as the solenoid valve for the fuel injection device, and to increase the current or the number of turns of the coil to obtain the necessary and sufficient attractive force. It is possible to increase the boost value and the rise speed by reducing the size, and to reduce the size of the electromagnetic coil itself. That is, the magnetic flux density can be reduced in order to generate the same attractive force as the dog with the magnetic circuit area, and the electromagnetic coil can be downsized accordingly.
  • the outer diameter of the seal member is smaller than the outer diameter of the electromagnetic coil, so that a large amount of magnetic flux can be generated between the electromagnetic coil and the armature, and the armature formed by the electromagnetic coil can be used.
  • One suction force can be increased.
  • the magnetic flux also passes through this core portion, so that the armature can be sucked with a larger suction force.
  • the thickness of the seal member is set small and the inner and outer magnetic path cross-sectional areas are well-balanced, the area of the suction part will be the square of the diameter, so the magnetic path cross-sectional area will be more effective Can be increased.
  • leakage of magnetic flux that does not act on suction also increases. Therefore, there is an optimum value for the thickness of the sealing member.
  • the attraction force of the electromagnetic coil can be increased in the same space.
  • the setting force of the return spring can be increased, so that the adjustment range of the injection amount can be increased. It is possible to improve the performance.
  • FIG. 1 is a longitudinal sectional view of a solenoid valve 20 for a fuel injection device according to a first embodiment of the present invention.
  • FIG. 2 is a longitudinal sectional view showing an example in which a solenoid valve 31 for a fuel injection device according to a second embodiment of the present invention is incorporated in an actual fuel injection device 30.
  • FIG. 3 is a longitudinal sectional view of a conventional solenoid valve 1 for a fuel injection device.
  • FIG. 1 is a longitudinal sectional view of a solenoid valve 20 for a fuel injection device.
  • the solenoid valve 20 for a fuel injection device includes a core part 2 together with the electromagnetic coil 3, the armature 5 and the needle valve 6. And a seal member 22 corresponding to the seal member 4.
  • the core 21 has an inner core 23, a first outer core 24, and a second outer core 25 each having a hollow cylindrical shape.
  • the inner core portion 23, the first outer core portion 24, and the second outer core portion 25 are separate from each other, but they are both made of a magnetic material and pass a magnetic flux.
  • the seal member 22 is made of a non-magnetic material, and supports the bobbin 10 of the electromagnetic coil 3 together with the second outer core portion 25.
  • the first outer core portion 24 has a step portion 24A, and the step portion 24A on the opposite side between the inner core portion 23 and the first outer core portion 24.
  • An open space 26 is formed in a ring shape at one end facing the first mater 5 side, and the open space 26 is provided with the electromagnetic coil 3, the seal member 22, and the second outer core. Part 25 is provided.
  • the outer diameter of the core portion 21 (the inner core portion 23, the first outer core portion 24, and the second outer core portion 25) on the side of the armature 5 side is larger than the inner core portion 23.
  • a cylindrical seal member 22 having D is provided, and a second outer core portion 25 made of a ferromagnetic material is located outside the cylindrical seal member 22.
  • the outer diameter D of the sealing member 22 is smaller than the outer diameter C of the electromagnetic coil 3.
  • the lower end surface 22A of the seal member 22 on the armature 15 side is connected to the lower end surface 23A of the inner core portion 23 and the second outer core portion 25.
  • a slight gap 27 is provided by projecting slightly from the lower end surface 25 A to the armature 15 side, and a non-magnetic material is used when the armature 15 is sucked and lifted upward in the figure.
  • the armature 5 abuts only on the lower end surface 22A of a certain seal member 22, and the armature 5 easily moves downward in the figure by the urging force of the return spring 8 when the electromagnetic coil 3 is demagnetized. It is possible.
  • the seal member 22, the inner core portion 23, and the second outer core portion 25 are integrated into a single body.
  • the electromagnetic coil 3 is inserted into the inner core part 23 from above in the figure.
  • first outer core portion 24 is inserted from above, and after press-fitting into the inner core portion 23, the entire circumference is welded and fixed.
  • the magnetic path and the suction portion (the second outer core portion 25 Since the cross-sectional area of the inner core portion 23) can be set large, the suction force can be increased.
  • an increase in the attraction force F means a decrease in the boosted value, and the current value or the number of turns of the coil 11 of the electromagnetic coil 3 can be reduced.
  • FIG. 2 is a longitudinal sectional view showing an example in which a solenoid valve for a fuel injection device according to a second embodiment of the present invention is incorporated in an actual fuel injection device 30.
  • a connector 32 along with the fuel injector solenoid valve 31, a connector 32, an upper valve housing 33 (corresponding to the first outer core portion 24), a lower valve housing 34, and a fuel supply pipe 35 are provided.
  • the solenoid valve 31 for the fuel injection device includes a core 21 (an inner core 23, a first outer core 24, a second outer core 25), an electromagnetic coil 3, and a disk-shaped mater. Along with 5 and 21 valves 6, a seal member 37 corresponding to the seal members 4 and 22 is provided.
  • the sealing member 37 has a first elastic tongue 38 and a bobbin of the electromagnetic coil 3 at a radially pressed portion between the second outer core portion 25 and the second outer core portion 25.
  • a second elastic tongue piece 39 is formed at the axially press-contact portion between 10 and 10. The sealing performance has been improved.
  • the sealing member 37 is used similarly to the fuel injection device solenoid valve 20 described with reference to FIG. Since the fuel was sealed and the radial cross-sectional area of the sealing member 37 was reduced, the area of the magnetic path formed between the electromagnetic coil 3 and the armature 5 was increased accordingly. The suction power can be increased.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A solenoid valve for fuel injectors, which is capable of providing a large attractive force and a large magnetic path area of an electromagnetic coil (3), and meeting a requirement for the improvement of the response of the solenoid valve with the outer diameter thereof kept unchanged and the increasing of a workable fuel pressure, and which has been designed in view of the fact that increasing a magnetic path area, which has been reduced by a seal member (22), of the portion which is between the electromagnetic coil (3) and an armature (5) enables a required attractive force to be obtained even by the same magnetomotive force, characterized in that an electromagnetic coil (3) and a seal member (22) of a nonmagnetic material are provided in an annularly formed open space (26) at one axial end portion, which is on the side of the armature (5), of an inner core member (23) and outer core members (24, 25) of a core (21) to close the open space (26), an outer diameter (D) of the seal member (22) being set smaller than that (C) of the electromagnetic coil (3).

Description

明 細 香 燃料噴射装置用ソレノィ ドバルブ 技術分野  Ms. Mei Sang Solenoid valve for fuel injection system Technical field
本発明は燃料噴射装置用ソレノィ ドバルブにかかるもので、 とくに吸引力を 大き く設定することができる燃料噴射装置用ソレノィ ドバルブに関するものであ る。 背景技術  The present invention relates to a solenoid valve for a fuel injection device, and more particularly to a solenoid valve for a fuel injection device capable of setting a large suction force. Background art
従来のガソリン吸気管噴射用、 あるいは髙圧简内直接噴射用の電磁式インジ ェク ターなどの燃料噴射装置に用いられるソレノィ ドバルブのソレノィ ドに大き な吸引力が必要な場合には、 プランジャ型のソレノィ ドより吸引面積を大きく設 定することができるディスク型のソレノィ ドが一般に用いられている。 すなわち 、 同一外径においてはディスク型のソレノィ ドの方がその吸引面積を大き く設定 することができるので、 発生吸引力を大き く取ることが可能である。 したがって 、 高い応答性や髙燃庄状態で作動が必要な場合に比齩的容易に使用されている。 たとえば、 特開平 8— 1 8 9 4 3 7号、 特開平 8— 2 1 0 2 1 7号などがある。  If a large suction force is required for the solenoid of a solenoid valve used in a conventional fuel injector such as an electromagnetic type injector for gasoline intake pipe injection or direct injection in a pressure chamber, a plunger type A disk-type solenoid that can set a larger suction area than the conventional solenoid is generally used. That is, for the same outer diameter, the disk-type solenoid can set a larger suction area, so that the generated suction force can be increased. Therefore, it is relatively easily used when high responsiveness or high-pressure operation is required. For example, Japanese Patent Application Laid-Open Nos. Hei 8-189347 and Hei 8-210207 are available.
しかしながら、 このディ スク型のソレノイ ドでも、 限られたスペース内にお いて得ることができる吸引力に限度があるという問題がある。  However, even with this disk-type solenoid, there is a problem that the suction force that can be obtained in a limited space is limited.
第 3図にもとづき、 従来の燃料噴射装置用ソ レノィ ドバルブ 1について概説 する。  An outline of a conventional solenoid valve 1 for a fuel injection device will be given based on FIG.
第 3図は、 燃料噴射装置用ソレノイ ドバルブ 1の縦断面図であって、 燃料噴 射装置用ソレノイ ドバルブ 1は、 コア部 2と、 電磁コイル 3と、 シール部材 4と 、 ディスク型のァ一マチヤ一 5と、 二一 ドル弁 6と、 を有する。  FIG. 3 is a longitudinal sectional view of a solenoid valve 1 for a fuel injection device. The solenoid valve 1 for a fuel injection device has a core 2, an electromagnetic coil 3, a seal member 4, and a disk-shaped solenoid valve. It has a Machiya 1 and a $ 21 valve 6.
コア部 2は、 これを磁性体から構成し、 電磁コイル 3の内径側および外径側 を囲んで磁束を通すもので、 その中央部を燃料通路 7とするとともに、 リターン スプリング 8を設置可能としてある。 The core part 2 is made of a magnetic material, and the inner and outer diameter sides of the electromagnetic coil 3 are formed. The center of the fuel passage 7 and the return spring 8 can be installed.
電磁コイル 3は、 通電用のターミナル 9を取り付けたボビン 1 0と、 通電に より起磁力を発生させるコイル 1 1と、 を有し、 コア部 2に磁気回路を形成可能 である。  The electromagnetic coil 3 has a bobbin 10 to which a terminal 9 for energization is attached, and a coil 11 for generating a magnetomotive force by energization, and a magnetic circuit can be formed in the core 2.
シール部材 4は、 これを非磁性体から構成し、 コア部 2の内周側および外周 側の磁路を遮断することにより、 コア部 2とァ一マチヤ一 5との間の磁路を確保 し、 燃料通路 7側から電磁コイル 3側に燃料が侵入しないようにシールするもの である。  The sealing member 4 is made of a non-magnetic material, and the magnetic path between the core 2 and the armature 15 is secured by blocking the magnetic paths on the inner peripheral side and the outer peripheral side of the core 2. In addition, a seal is provided to prevent fuel from entering the electromagnetic coil 3 from the fuel passage 7 side.
ァ—マチヤ— 5は、 これを磁性体から構成し、 コア部 2との間に磁気回路を 形成して電磁コイル 3 (コア部 2 ) に吸着可能である。  The armature 5 is made of a magnetic material, forms a magnetic circuit with the core 2, and can be attracted to the electromagnetic coil 3 (core 2).
二一ドル弁 6は、 ァ一マチヤ一 5に取り付けるとともに、 バルブシート 1 2 の噴射孔 1 3から吸気管あるいはシリンダ一内に直接燃料を噴射可能とする。  The dollar valve 6 is attached to the armature 5 and allows fuel to be injected directly into the intake pipe or the cylinder from the injection hole 13 of the valve seat 12.
なお、 燃料噴射装置用ソレノイ ドバルブ 1を組み立てるにあたっては、 ァ一 マチヤ一 5側 （図中下側） から電磁コイル 3をコア部 2に揷入し、 さらにシール 部材 4をコア部 2に圧入後、 全周溶接を行う。  When assembling the solenoid valve 1 for a fuel injection device, the electromagnetic coil 3 is inserted into the core 2 from the first mater 5 side (the lower side in the figure), and the sealing member 4 is pressed into the core 2 after press-fitting. Perform full circumference welding.
こうした構成の燃料噴射装置用ソレノィ ドバルブ 1において、 電磁コイル 3 の励磁時におけるァ一マチヤ一 5を吸引するその吸引力 Fは、  In the solenoid valve 1 for a fuel injection device having such a configuration, the suction force F for sucking the armature 5 when the electromagnetic coil 3 is excited is
F = φ 2 , ( μ · S · V ) 、 から求められる。 F = φ 2 , (μ · S · V).
ただし、 øは磁束量 （w b ) 、 μは透磁率、 Sは吸引部 （コア部 2がァ一マ チヤ一 5と対向する、 シール部材 4を除いた部分） の面積、 および Vは漏れ係数 である。  Where ø is the amount of magnetic flux (wb), μ is the magnetic permeability, S is the area of the suction part (the part where the core part 2 faces the armature 5 and the sealing member 4 is excluded), and V is the leakage coefficient It is.
すなわち、 燃料噴射装置用ソレノイ ドバルブ 1の吸引力 Fは、 磁束量？ こよ り決定される。 一般的に磁性材料は、 その飽和磁束密度が決まっているため、 そ の磁束量 の最大値は、 磁路断面積に比例する。  That is, the suction force F of the solenoid valve 1 for fuel injection device is the amount of magnetic flux? It is determined from this. In general, since the saturation magnetic flux density of a magnetic material is determined, the maximum value of the magnetic flux is proportional to the cross-sectional area of the magnetic path.
要するに、 磁路断面積を大きくした方が吸引力 Fを大きくすることができる わけであるが、 シール部材 4がコア部 2のァ一マチヤー 5との対向する磁路断面 積部分を大き く締めてしまっているため、 すなわち、 このシ一ル部材 4の部分が 電磁コイル 3によるァ一マチヤ一 5の吸引作用に寄与していないため、 使用可能 な吸引力 Fおよび磁路面積が制限され、 従来の燃料噴射装置用ソレノィ ドバルブ 1においては磁路断面積をそれほど大き く取ることができず、 吸引力 Fを大き く することが困難であるという問題がある。 In short, the larger the magnetic path cross-sectional area, the larger the attractive force F can be. However, since the sealing member 4 has greatly tightened the magnetic path cross-sectional area of the core portion 2 facing the armature 5, that is, the portion of the sealing member 4 is the electromagnetic coil 3. Does not contribute to the suction action of the armature 5 due to the above, the usable suction force F and the magnetic path area are limited, and the conventional magnetic solenoid valve 1 for a fuel injection device has a large magnetic path cross-sectional area. Therefore, there is a problem that it is difficult to increase the suction force F.
したがって、 コア部 2が同一外径寸法のままでは、 燃料噴射装置用ソレノィ ドバルブ 1として、 さ らなる応答性の改善や作動可能燃料圧力の増加を要求され た場合に対応することができないという問題がある。  Therefore, if the core portion 2 has the same outer diameter, the solenoid valve 1 for a fuel injection device cannot respond to a demand for further improvement in responsiveness or an increase in operable fuel pressure. There is.
こう した問題は、 燃料噴射圧の高圧化、 応答性の向上の要請などには障害と なるもので、 同一外径で吸引力 Fを大き くすること、 あるいはより小型の電磁コ ィル 3で必要十分な吸引力 Fを発生させること、 などが要請されている。 発明の開示  These problems are obstacles to demands for higher fuel injection pressures and improved responsiveness, for example, by increasing the suction force F with the same outer diameter, or by using a smaller electromagnetic coil 3. It is required to generate the necessary and sufficient suction force F. Disclosure of the invention
本発明は ^上のような諸問題にかんがみなされたもので、 従来よりも大きな 吸引力を得ることが可能な燃料噴射装置用ソレノィ ドバルブを提供することを課 題とする。  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a solenoid valve for a fuel injection device capable of obtaining a larger suction force than before.
また本発明は、 従来よりも大きな磁路面積を得ることが可能な燃料噴射装置 用ソレノィ ドバルブを提供することを課題とする。  Another object of the present invention is to provide a solenoid valve for a fuel injection device capable of obtaining a larger magnetic path area than ever before.
また本発明は、 外径寸法の増加を行う ことなしに、 吸引力を大き く設定可能 な燃料噴射装置用ソレノィ ドバルブを提供することを課題とする。  Another object of the present invention is to provide a solenoid valve for a fuel injection device that can set a large suction force without increasing the outer diameter.
また本発明は、 同一外径寸法で応答性の改善や作動可能燃料圧力の増加の要 請に対応可能な燃料噴射装置用ソレノィ ドバルブを提供することを課題とする。  Another object of the present invention is to provide a solenoid valve for a fuel injection device which can respond to requests for improved responsiveness and increased operable fuel pressure with the same outer diameter.
また本発明は、 従来と同一スペースにおいて、 電磁コイルの吸引力を増加し 、 高応答性や高燃料圧力状態での良好な作動性を実現可能な燃料噴射装置用ソレ ノィ ドバルブを提供することを課題とする。 すなわち本発明は、 シール部材が電磁コイルとァーマチヤ一との間の磁路面 積を縮小していること、 この部分の磁路面積を拡大すれば同一の起磁力でも必要 が吸引力を得ることが可能であることに着目したもので、 第一の発明は、 磁性体 から構成したコア部と、 このコア部に磁気回路を形成可能な電磁コイルと、 この コア部に吸着可能なディスク型のァ一マチヤ一と、 このァ一マチヤ一に取り付け るとともに、 噴射孔から燃料を噴射可能とするニードル弁と、 を有する燃料噴射 装置用ソレノイ ドバルブであって、 上記コア部を、 内側コア部および外側コア部 から構成するとともに、 これら内側コア部および外側コア部の軸方向における、 上記ァ一マチヤ一側の一端をリング状に開口して開口空間部を形成し、 この開口 空間部に上記電磁コイルを設け、 さらに非磁性体から構成したシール部材を設け てこの開口空間部を閉鎖し、 かっこのシール部材の外径は、 上記電磁コイルの外 怪よりこれを小さくしたことを特徴とする燃料噴射装置用ソレノィ ドバルブであ る。 Another object of the present invention is to provide a solenoid valve for a fuel injection device capable of increasing the attraction force of an electromagnetic coil and realizing high responsiveness and good operability in a high fuel pressure state in the same space as before. Make it an issue. That is, according to the present invention, the sealing member reduces the magnetic path area between the electromagnetic coil and the armature, and if the magnetic path area of this portion is increased, it is necessary to obtain the attractive force even with the same magnetomotive force. The first aspect of the present invention focuses on the fact that the core is made of a magnetic material, an electromagnetic coil that can form a magnetic circuit in the core, and a disk-shaped key that can be attracted to the core. A solenoid valve for a fuel injection device, comprising: a needle and a needle valve attached to the armature and capable of injecting fuel from an injection hole, wherein the core part is formed by an inner core part and an outer part. An opening space is formed by opening one end of the inner core portion and the outer core portion on the side of the armature in the axial direction in a ring shape, and forming an opening space portion. The electromagnetic coil is provided, and a sealing member made of a non-magnetic material is further provided to close the open space. The outer diameter of the bracket is smaller than that of the electromagnetic coil. This is a solenoid valve for a fuel injection device that operates.
第二の発明は、 磁性体から構成したコア部と、 このコア部に磁気回路を形成 可能な電磁コイルと、 このコア部に吸着可能なディスク型のァ一マチヤ一と、 こ のァ一マチヤ一に取り付けるとともに、 噴射孔から燃料を噴射可能とする二一ド ル弁と、 を有する燃料噴射装置用ソレノイ ドバルブであって、 上記コア部を、 内 側コア部および外側コア部から構成するとともに、 これら内側コア部および外側 コア部の軸方向における、 上記ァ一マチヤ一側の一端をリング状に開口して開口 空間部を形成し、 この開口空間部に、 上記電磁コイルを設け、 この開口空間部の 内周側に非磁性体から構成したシール部材を設け、 さらにこの開口空間部の外周 側に上記外側コア部を位置させることにより、 この開口空間部を閉鎖したことを 特徴とする燃料噴射装置用ソレノィ ドバルブである。  A second aspect of the present invention relates to a core portion made of a magnetic material, an electromagnetic coil capable of forming a magnetic circuit in the core portion, a disk-type mechanism that can be attracted to the core portion, and a magnetic member. A solenoid valve for a fuel injection device, comprising: a core valve having an inner core portion and an outer core portion, wherein the core portion comprises an inner core portion and an outer core portion. One end of the inner core portion and the outer core portion on the side of the armature in the axial direction is opened in a ring shape to form an opening space, and the electromagnetic coil is provided in the opening space, and the opening is formed. A seal member made of a non-magnetic material is provided on the inner peripheral side of the space, and the outer core is located on the outer peripheral side of the open space, thereby closing the open space. This is a solenoid valve for a fuel injection device.
上記内側コア部および上記外側コア部は、 互いに別部材からこれを構成し、 この内側コア部は、 これを中空円筒形状とし、 この外側コア部は、 これをその内 周面に上記開口空間部を形成可能な段部を有する中空円筒形状とすることができ る。 The inner core portion and the outer core portion are formed from separate members, and the inner core portion is formed into a hollow cylindrical shape, and the outer core portion is formed on the inner peripheral surface thereof by the opening space portion. Can have a hollow cylindrical shape with a step that can form You.
上記シール部材には、 そのシール性能を高めるための弾性舌片を形成するこ とができる。  An elastic tongue for improving the sealing performance can be formed on the seal member.
さ らに、 コア部を内側コア部および外側コア部に分割して構成するための分 割形態については、 ソレノイ ドバルブとして組み立て可能で、 かつ非磁性体のシ —ル部材の断面積を小さ くすることができれば、 任意の構成を採用可能である。  In addition, the split configuration for dividing the core portion into the inner core portion and the outer core portion can be assembled as a solenoid valve, and the cross-sectional area of the nonmagnetic seal member is reduced. If possible, any configuration can be adopted.
本発明による燃料噴射装置用ソレノィ ドバルブにおいては、 シール部材が電 磁コイルの部分への燃料侵入を防止するとともに磁路を確保し、 このシール部材 の断面積を小さ くするようにしたので、 電磁コィルとァ一マチヤーとの間の磁路 面積をその分だけ大き くすることが可能となり、 電磁コイルによるァ一マチヤ一 の吸引力を大き くすることができる。  In the solenoid valve for a fuel injection device according to the present invention, the seal member prevents fuel from entering the electromagnetic coil portion, secures a magnetic path, and reduces the cross-sectional area of the seal member. The magnetic path area between the coil and the armature can be increased by that much, and the attraction force of the armature by the electromagnetic coil can be increased.
したがって、 燃料噴射装置用ソレノイ ドバルブとして同一外径で、 電磁コィ ルの吸引力を大き くすることができるとともに、 必要十分な吸引力を得るために 電磁コイルに通電する電流あるいはコイルの巻き数を減らして、 昇圧値および立 ち上がり速度を増加させ、 電磁コイル自体の小型化が可能である。 すなわち、 磁 路面積を犬として、 同じ吸引力を発生するために磁束密度を低下させることがで き、 その分電磁コイルを小型化することができる。  Therefore, it is possible to increase the attractive force of the electromagnetic coil with the same outer diameter as the solenoid valve for the fuel injection device, and to increase the current or the number of turns of the coil to obtain the necessary and sufficient attractive force. It is possible to increase the boost value and the rise speed by reducing the size, and to reduce the size of the electromagnetic coil itself. That is, the magnetic flux density can be reduced in order to generate the same attractive force as the dog with the magnetic circuit area, and the electromagnetic coil can be downsized accordingly.
たとえば第一の発明では、 シール部材の外径を電磁コィルの外径より小さ く したので、 電磁コイルとァ一マチヤ一との間に磁束を多く発生することができ、 電磁コイルによるァ一マチヤ一の吸引力を増大可能である。  For example, in the first invention, the outer diameter of the seal member is smaller than the outer diameter of the electromagnetic coil, so that a large amount of magnetic flux can be generated between the electromagnetic coil and the armature, and the armature formed by the electromagnetic coil can be used. One suction force can be increased.
さ らに第二の発明では、 シール部材より外周側にコア部を配置したので、 こ のコア部にも磁束が通ってァーマチヤ一をより大きな吸引力で吸引することがで きる。  Further, in the second invention, since the core portion is arranged on the outer peripheral side of the seal member, the magnetic flux also passes through this core portion, so that the armature can be sucked with a larger suction force.
また、 シール部材の厚さを小さ く設定し、 内側および外側の磁路断面積をバ ランスよく配置すれば、 吸引部分の面積は径の 2乗となるため、 より効果的に磁 路断面積を増加させることができる。 ただし、 吸引に作用しない磁束の漏れも増 加するため、 シール部材の厚さには最適値が存在する。 Also, if the thickness of the seal member is set small and the inner and outer magnetic path cross-sectional areas are well-balanced, the area of the suction part will be the square of the diameter, so the magnetic path cross-sectional area will be more effective Can be increased. However, leakage of magnetic flux that does not act on suction also increases. Therefore, there is an optimum value for the thickness of the sealing member.
以上のように本発明によれば、 シール部材の大きさを小さ く したので、 同一 スペースで電磁コイルの吸引力を増加させることができる。  As described above, according to the present invention, since the size of the sealing member is reduced, the attraction force of the electromagnetic coil can be increased in the same space.
また、 磁路断面積が大き くなるため、 同一吸引力時の起磁力を低下させるこ とができる。  Further, since the magnetic path cross-sectional area increases, the magnetomotive force at the same attractive force can be reduced.
さ らに、 燃料噴射装置としての応答性の改善および使用燃料圧力の上昇とと もに、 リ ターンスプリングのセッ ト力を大き くすることができるので噴射量の調 量範囲を増加することができる、 などその性能を向上させることが可能となる。  In addition to improving the responsiveness of the fuel injection device and increasing the fuel pressure used, the setting force of the return spring can be increased, so that the adjustment range of the injection amount can be increased. It is possible to improve the performance.
なおまた、 燃料圧力を大き く設定することができれば、 噴霧の微粒化を促進 可能で、 エンジンの燃焼および排気特性を改善することもできる。 図面の簡単な説明  Furthermore, if the fuel pressure can be set high, atomization of the spray can be promoted, and the combustion and exhaust characteristics of the engine can be improved. BRIEF DESCRIPTION OF THE FIGURES
第 1図は、 本発明の第 1の実施の形態による燃料噴射装置用ソレノィ ドバル ブ 2 0の縦断面図である。  FIG. 1 is a longitudinal sectional view of a solenoid valve 20 for a fuel injection device according to a first embodiment of the present invention.
第 2図は、 本発明の第 2の実施の形態による燃料噴射装置用ソレノィ ドバル ブ 3 1を実際の燃料噴射装置 3 0に組み込んだ例を示す縦断面図である。  FIG. 2 is a longitudinal sectional view showing an example in which a solenoid valve 31 for a fuel injection device according to a second embodiment of the present invention is incorporated in an actual fuel injection device 30.
第 3図は、 従来の燃料噴射装置用ソ レノィ ドバルブ 1の縦断面図である。 発明を実施するための最良の形態  FIG. 3 is a longitudinal sectional view of a conventional solenoid valve 1 for a fuel injection device. BEST MODE FOR CARRYING OUT THE INVENTION
つぎに、 本発明の第 1の実施の形態による燃料噴射装置用ソレノィ ドバルブ 2 0を第 1図にもとづき説明する。 ただし、 第 3図と同様の部分には同一符号を 付し、 その詳述はこれを省略する。  Next, a solenoid valve 20 for a fuel injection device according to a first embodiment of the present invention will be described with reference to FIG. However, the same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
第 1図は、 燃料噴射装置用ソレノイ ドバルブ 2 0の縦断面図であって、 燃料 噴射装置用ソレノイ ドバルブ 2 0は、 前記電磁コイル 3、 ァ一マチヤー 5および ニー ドル弁 6とともに、 コア部 2に相当するコア部 2 1 と、 シール部材 4に相当 するシール部材 2 2と、 を有する。 コア部 2 1は、 それぞれ中空円筒形状とした内側コア部 2 3、 第 1の外側コ ァ部 2 4および第 2の外側コア部 2 5を有する。 FIG. 1 is a longitudinal sectional view of a solenoid valve 20 for a fuel injection device. The solenoid valve 20 for a fuel injection device includes a core part 2 together with the electromagnetic coil 3, the armature 5 and the needle valve 6. And a seal member 22 corresponding to the seal member 4. The core 21 has an inner core 23, a first outer core 24, and a second outer core 25 each having a hollow cylindrical shape.
内側コア部 2 3、 第 1の外側コア部 2 4および第 2の外側コア部 2 5は、 互 いに別体ではあるが、 これらをともに磁性体から構成し、 磁束を通す。  The inner core portion 23, the first outer core portion 24, and the second outer core portion 25 are separate from each other, but they are both made of a magnetic material and pass a magnetic flux.
シール部材 2 2は、 これを非磁性体から構成し、 第 2の外側コア部 2 5とと もに電磁コイル 3のボビン 1 0を支持している。  The seal member 22 is made of a non-magnetic material, and supports the bobbin 10 of the electromagnetic coil 3 together with the second outer core portion 25.
すなわち、 第 1の外側コア部 2 4は段部 2 4 Aを有し、 内側コア部 2 3およ び第 1の外側コア部 2 4の間においてこの段部 2 4 Aとは反対側のァ一マチヤ一 5側に対向した一端にリング状に開口空間部 2 6を開口形成し、 この開口空間部 2 6に電磁コイル 3、 さ らにシ一ル部材 2 2および第 2の外側コア部 2 5を設け てある。  In other words, the first outer core portion 24 has a step portion 24A, and the step portion 24A on the opposite side between the inner core portion 23 and the first outer core portion 24. An open space 26 is formed in a ring shape at one end facing the first mater 5 side, and the open space 26 is provided with the electromagnetic coil 3, the seal member 22, and the second outer core. Part 25 is provided.
換言すれば、 コア部 2 1 (内側コア部 2 3、 第 1の外側コア部 2 4および第 2の外側コア部 2 5 ) のァ一マチヤー 5側端面に内側コア部 2 3より大きな外径 Dを有する円筒状のシ一ル部材 2 2を設け、 さ らにその外側に強磁性体の第 2の 外側コア部 2 5が位置している。 ただし、 シール部材 2 2の外径 Dは、 電磁コィ ル 3の外径 Cより小さ く してある。 これらの三つの部材は、 プロジェク シヨ ン溶 接や圧入溶接などで一体に制作されている。  In other words, the outer diameter of the core portion 21 (the inner core portion 23, the first outer core portion 24, and the second outer core portion 25) on the side of the armature 5 side is larger than the inner core portion 23. A cylindrical seal member 22 having D is provided, and a second outer core portion 25 made of a ferromagnetic material is located outside the cylindrical seal member 22. However, the outer diameter D of the sealing member 22 is smaller than the outer diameter C of the electromagnetic coil 3. These three components are integrally manufactured by projection welding or press fitting welding.
なお、 要部を拡大して示すように、 シール部材 2 2のァーマチヤ一 5側の下 端面 2 2 Aを、 内側コア部 2 3の下端面 2 3 Aおよび第 2の外側コア部 2 5の下 端面 2 5 Aよりわずかにァ一マチヤ一 5側に突出させてわずかな空隙部 2 7を設 け、 ァ一マチヤ一 5が吸引されて図中上方にリフ ト したときに非磁性体であるシ —ル部材 2 2の下端面 2 2 Aのみにァ一マチヤー 5が当接し、 電磁コイル 3の消 磁時にリ ターンスプリング 8の付勢力によってァ一マチヤー 5が容易に図中下方 に移動可能としてある。  As shown in an enlarged manner, the lower end surface 22A of the seal member 22 on the armature 15 side is connected to the lower end surface 23A of the inner core portion 23 and the second outer core portion 25. A slight gap 27 is provided by projecting slightly from the lower end surface 25 A to the armature 15 side, and a non-magnetic material is used when the armature 15 is sucked and lifted upward in the figure. The armature 5 abuts only on the lower end surface 22A of a certain seal member 22, and the armature 5 easily moves downward in the figure by the urging force of the return spring 8 when the electromagnetic coil 3 is demagnetized. It is possible.
また、 燃料噴射装置用ソレノイ ドバルブ 2 0を組み立てるにあたっては、 シ 一ル部材 2 2、 内側コア部 2 3および第 2の外側コア部 2 5を一体状態として、 内側コア部 2 3に電磁コイル 3を図中上側から挿入する。 When assembling the solenoid valve 20 for a fuel injection device, the seal member 22, the inner core portion 23, and the second outer core portion 25 are integrated into a single body. The electromagnetic coil 3 is inserted into the inner core part 23 from above in the figure.
さらに上側から第 1の外側コア部 2 4を挿入し、 内側コア部 2 3に圧入後、 全周溶接を行って固定する。  Further, the first outer core portion 24 is inserted from above, and after press-fitting into the inner core portion 23, the entire circumference is welded and fixed.
こう した構成の燃料噴射装置用ソレノィ ドバルブ 2 0において、 シール部材 2 2の肉厚 Wが小さいほど、 全体が同一外径寸法でありながら、 磁路および吸引 部 （第 2の外側コア部 2 5および内側コア部 2 3 ) の断面積を大き く設定するこ とができるため、 その吸引力を増加させることができる。  In the solenoid valve 20 for a fuel injection device having such a configuration, as the thickness W of the seal member 22 is smaller, the magnetic path and the suction portion (the second outer core portion 25 Since the cross-sectional area of the inner core portion 23) can be set large, the suction force can be increased.
前記空隙部 2 7の磁路抵抗 Rは、 R = l / ( μ · S ) 、 で表される。  The magnetic path resistance R of the gap 27 is represented by R = l / (μ · S).
この吸引部の断面積 Sが大きいと、 この磁路抵抗 Rが小さ く、 さ らにコア部 2 1の磁束密度が低下するため、 同一の吸引力 Fを得るための起磁力を低下させ ても構わない。  If the cross-sectional area S of the attracting portion is large, the magnetic path resistance R is small, and the magnetic flux density of the core portion 21 is further reduced. Therefore, the magnetomotive force for obtaining the same attractive force F is reduced. No problem.
つま り、 吸引力 Fが増加することは、 昇圧値が減少することであり、 電磁コ ィル 3のコイル 1 1に流す電流値あるいはその巻き数を減らすことができる。  In other words, an increase in the attraction force F means a decrease in the boosted value, and the current value or the number of turns of the coil 11 of the electromagnetic coil 3 can be reduced.
第 2図は、 本発明の第 2の実施の形態による燃料噴射装置用ソレノィ ドバル ブを実際の燃料噴射装置 3 0に組み込んだ例を示す縦断面図であり、 燃料噴射装 置 3 0は、 この燃料噴射装置用ソレノイ ドバルブ 3 1 とともに、 コネク ター 3 2 と、 上方バルブハウジング 3 3 (第 1の外側コア部 2 4に相当） と、 下方バルブ ハウジング 3 4と、 燃料供給用パイプ 3 5と、 スプリングシー ト 3 6と、 前記バ ルブシー ト 1 2と、 を有する。  FIG. 2 is a longitudinal sectional view showing an example in which a solenoid valve for a fuel injection device according to a second embodiment of the present invention is incorporated in an actual fuel injection device 30. Along with the fuel injector solenoid valve 31, a connector 32, an upper valve housing 33 (corresponding to the first outer core portion 24), a lower valve housing 34, and a fuel supply pipe 35 are provided. , A spring sheet 36 and the valve sheet 12.
燃料噴射装置用ソレノイ ドバルブ 3 1は、 コア部 2 1 (内側コア部 2 3、 第 1の外側コア部 2 4、 第 2の外側コア部 2 5 ) 、 電磁コイル 3、 ディスク型のァ —マチヤー 5および二一 ドル弁 6とともに、 シール部材 4、 2 2に相当するシ一 ル部材 3 7を有している。  The solenoid valve 31 for the fuel injection device includes a core 21 (an inner core 23, a first outer core 24, a second outer core 25), an electromagnetic coil 3, and a disk-shaped mater. Along with 5 and 21 valves 6, a seal member 37 corresponding to the seal members 4 and 22 is provided.
このシール部材 3 7は、 要部を拡大して示すように、 第 2の外側コア部 2 5 との間における半径方向の圧接部に第 1の弾性舌片 3 8、 および電磁コィル 3の ボビン 1 0との間における軸方向の圧接部に第 2の弾性舌片 3 9を形成し、 燃料 のシール性能を向上させてある。 As shown in an enlarged manner, the sealing member 37 has a first elastic tongue 38 and a bobbin of the electromagnetic coil 3 at a radially pressed portion between the second outer core portion 25 and the second outer core portion 25. A second elastic tongue piece 39 is formed at the axially press-contact portion between 10 and 10. The sealing performance has been improved.
こう した構成の燃料噴射装置用ソレノィ ドバルブ 3 1を装備した燃料噴射装 置 3 0においても、 第 1図にもとづいて説明した燃料噴射装置用ソレノィ ドバル ブ 2 0と同様に、 シール部材 3 7により燃料のシールを行う とともに、 シール部 材 3 7の半径方向の断面積を小さく したので、 その分電磁コィル 3とァーマチヤ ― 5との間に形成される磁路面積を拡大し、 電磁コィル 3の吸引力を増加させる ことができる。  In the fuel injection device 30 equipped with the fuel injection device solenoid valve 31 having such a configuration, the sealing member 37 is used similarly to the fuel injection device solenoid valve 20 described with reference to FIG. Since the fuel was sealed and the radial cross-sectional area of the sealing member 37 was reduced, the area of the magnetic path formed between the electromagnetic coil 3 and the armature 5 was increased accordingly. The suction power can be increased.

Claims

請 求 の 範 囲 The scope of the claims
1 磁性体から構成したコア部と、 1 A core made of a magnetic material,
このコア部に磁気回路を形成可能な電磁コイルと、  An electromagnetic coil capable of forming a magnetic circuit in the core,
このコア部に吸着可能なディスク型のァ一マチヤ一と、  A disc-shaped armature that can be attracted to this core,
このァ一マチヤ一に取り付けるとともに、 噴射孔から燃料を噴射可能とする 二一 ドル弁と、 を有する燃料噴射装置用ソレノィ ドバルブであって、  A solenoid valve for a fuel injection device, comprising: a twenty-one valve attached to the armature and capable of injecting fuel from an injection hole;
前記コア部を、 内側コア部および外側コア部から構成するとともに、 これら内側コア部および外側コア部の軸方向における、 前記ァ一マチヤ一側 の一端を リング状に開口して開口空間部を形成し、  The core portion includes an inner core portion and an outer core portion, and one end of the inner core portion and the outer core portion on the side of the armature in the axial direction is formed in a ring shape to form an opening space. And
この開口空間部に前記電磁コイルを設け、 さ らに非磁性体から構成したシ一 ル部材を設けてこの開口空間部を閉鎖し、 かつ  The electromagnetic coil is provided in the opening space, and a sealing member made of a non-magnetic material is provided to close the opening space, and
このシール部材の外径は、 前記電磁コィルの外径より これを小さ く したこと を特徴とする燃料噴射装置用ソレノィ ドバルブ。  An outer diameter of the sealing member is smaller than an outer diameter of the electromagnetic coil.
2 磁性体から構成したコア部と、  2 A core made of a magnetic material,
このコア部に磁気回路を形成可能な電磁コィルと、  An electromagnetic coil capable of forming a magnetic circuit in the core,
このコア部に吸着可能なチ'イ スク型のァ一マチヤーと、  A disk-type armature that can be adsorbed to this core,
このァ一マチヤーに取り付けるとともに、 噴射孔から燃料を噴射可能とする 二一 ドル弁と、 を有する燃料噴射装置用ソレノィ ドバルブであって、  And a solenoid valve for a fuel injection device, comprising: a twenty-one valve attached to the armature and capable of injecting fuel from an injection hole;
前記コア部を、 内側コア部および外側コア部から搆成するとともに、 これら内側コア部および外側コア部の軸方向における、 前記ァ一マチヤ一側 の一端を リング状に開口して開口空間部を形成し、  The core portion is formed from an inner core portion and an outer core portion, and one end of the inner core portion and the outer core portion on the side of the armature in the axial direction is opened in a ring shape to form an opening space. Forming
この開口空間部に、 前記電磁コイルを設け、  The electromagnetic coil is provided in the opening space,
この開口空間部の内周側に非磁性体から構成したシール部材を設け、 さ らに この開口空間部の外周側に前記外側コア部を位置させることにより、 この開口空 間部を閉鎖したことを特徴とする燃料噴射装置用ソ レノィ ドバルブ。 3 前記内側コア部および前記外側コア部は、 互いに別部材からこれを構 成し、 A sealing member made of a non-magnetic material is provided on the inner peripheral side of the opening space, and the outer core is located on the outer peripheral side of the opening space, thereby closing the opening. A solenoid valve for a fuel injection device, characterized in that: (3) The inner core portion and the outer core portion are composed of members different from each other,
この内側コア部は、 これを中空円筒形状とし、  This inner core has a hollow cylindrical shape,
この外側コア部は、 これをその内周面に前記開口空間部を形成可能な段部を 有する中空円筒形状としたことを特徴とする請求項 1あるいは 2記載の燃料噴射 装置用ソレノィ ドバルブ。  3. The solenoid valve for a fuel injection device according to claim 1, wherein the outer core portion has a hollow cylindrical shape having a step portion on an inner peripheral surface of the outer core portion where the opening space can be formed.
4 前記シール部材には、 前記外側コア部との間、 あるいは前記電磁コィ ルのボビンとの間の少なくともいずれか一方に弾性舌片を形成したことを特徴と する請求項 1あるいは 2記載の燃料噴射装置用ソレノィ ドバルブ。  4 .The fuel according to claim 1, wherein an elastic tongue is formed on at least one of the seal member and the outer core portion or between the seal member and a bobbin of the electromagnetic coil. 4. Solenoid valve for injection device.
5 前記外側コア部は、  5 The outer core portion is
前記電磁コィルの外周側に配置する第 1の外側コア部と、  A first outer core portion disposed on the outer peripheral side of the electromagnetic coil,
前記シール部材の外周側にあつてこのシール部材とともに前記開口空間部を 閉鎖可能な第 2の外側コア部と、 を有することを特徴とする請求項 1あるいは 2 記載の燃料噴射装置用ソレノイ ドバルブ。  3. The solenoid valve for a fuel injection device according to claim 1, further comprising: a second outer core portion provided on an outer peripheral side of the seal member and capable of closing the opening space together with the seal member.
6 前記シール部材の前記ァーマチヤー側の下端面を、 前記内側コア部の 下端面および前記外側コア部の下端面よりわずかに前記ァ一マチヤ一側に突出さ せて、 前記内側コア部および前記外側コア部と前記ァーマチヤ一との間にわずか な空隙部を設けたことを特徴とする請求項 1あるいは 2記載の燃料噴射装置用ソ レノィ ドバルブ。  6 The lower end surface of the seal member on the armature side is projected slightly toward the armature side from the lower end surface of the inner core portion and the lower end surface of the outer core portion, and the inner core portion and the outer side are formed. 3. The solenoid valve for a fuel injection device according to claim 1, wherein a slight gap is provided between a core portion and the armature.
PCT/JP1998/002805 1997-07-03 1998-06-24 Solenoid valve for fuel injectors WO1999001661A1 (en)

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JP19205497A JPH1144275A (en) 1997-07-03 1997-07-03 Solenoid valve for fuel injection device
JP9/192054 1997-07-03

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JP6139191B2 (en) * 2013-03-14 2017-05-31 日立オートモティブシステムズ株式会社 Electromagnetic fuel injection valve
JP6520983B2 (en) * 2016-07-28 2019-05-29 株式会社デンソー Fuel injection valve and method of manufacturing fuel injection valve
JP6583179B2 (en) * 2016-07-28 2019-10-02 株式会社デンソー Fuel injection valve
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