JP7268546B2 - injector - Google Patents

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Publication number
JP7268546B2
JP7268546B2 JP2019160265A JP2019160265A JP7268546B2 JP 7268546 B2 JP7268546 B2 JP 7268546B2 JP 2019160265 A JP2019160265 A JP 2019160265A JP 2019160265 A JP2019160265 A JP 2019160265A JP 7268546 B2 JP7268546 B2 JP 7268546B2
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flow path
space
movable core
core
injector
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JP2021038699A (en
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貴政 伊藤
友基 藤野
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Denso Corp
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Denso Corp
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Priority to JP2019160265A priority Critical patent/JP7268546B2/en
Priority to DE112020004155.7T priority patent/DE112020004155T5/en
Priority to PCT/JP2020/032360 priority patent/WO2021044938A1/en
Publication of JP2021038699A publication Critical patent/JP2021038699A/en
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    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0251—Details of actuators therefor
    • F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
    • F02M21/0266—Hollow stem valves; Piston valves; Stems having a spherical tip
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

本開示は、インジェクタに関する。 The present disclosure relates to injectors.

例えば、特許文献１には、燃料噴射弁（インジェクタ）が開示されている。この燃料噴射弁は、ニードルと一体となってリフトする摺動部の上に第１空間、下に第２空間を設け、摺動部に第１空間と第２空間を連通する通路を設け、さらに、該通路に絞りを備えている。開弁時には、摺動部が上昇するが、絞りが第１空間と第２空間との間の燃料の移動を制限するため、第１空間の圧力が高くなり、第２空間の圧力が低くなる。この第１空間と第２空間の圧力差によりニードルや摺動部の移動に対して抗する力が生じ、摺動部の移動速度を抑制し、ニードルや摺動部がストッパに当たるときの衝撃・バウンスを低減している。 For example, Patent Literature 1 discloses a fuel injection valve (injector). This fuel injection valve has a first space above a sliding portion that lifts integrally with a needle, a second space below the sliding portion, and a passage that communicates the first space and the second space in the sliding portion, Furthermore, the passage is provided with a constriction. When the valve is opened, the sliding portion rises, but the restriction restricts the movement of fuel between the first space and the second space, so the pressure in the first space increases and the pressure in the second space decreases. . Due to the pressure difference between the first space and the second space, a force resisting the movement of the needle and the sliding part is generated, suppressing the moving speed of the sliding part, and reducing the impact and impact when the needle and the sliding part hit the stopper. Reduced bounce.

特開２０１４－２３１８１０号公報JP 2014-231810 A

開弁の際に第１空間の圧力と第２空間の圧力に圧力差が生じるが、第１空間から通路を通って第２空間に燃料が流れ込むことで、第１空間の圧力と第２空間の圧力は、最終的には等しくなる。しかし、第１空間、第２空間の圧力が等しくなる前に閉弁する場合には、第１空間と第２空間の圧力差により、摺動部を下降させる力が生じるため、摺動部の下降速度が上昇し、ニードルが弁座に当たるときの衝撃・バウンスが却って増大してしまう場合があった。 When the valve is opened, a pressure difference occurs between the pressure in the first space and the pressure in the second space. are eventually equalized. However, if the valve is closed before the pressures in the first space and the second space become equal, the pressure difference between the first space and the second space will generate a force to lower the sliding portion. In some cases, the lowering speed increases, and the impact and bounce when the needle hits the valve seat rather increases.

本開示は、以下の形態として実現することが可能である。 The present disclosure can be implemented as the following forms.

本開示の一形態によれば、インジェクタ（２０）が提供される。このインジェクタは、燃料を噴射する噴孔（３２）と内部に前記噴孔に連通する流路（１０１～１０５）が形成された筒状のハウジング（３０）と、前記噴孔を開閉する弁体（５２）を有するニードル（５０）と、前記ニードルを移動させる可動コア（４２）と、前記可動コアを前記ニードルの開弁方向に移動させる磁界を発生させるコイル（４４）と、前記可動コアの前記噴孔と反対側に設けられ、前記可動コアの移動範囲を規制する固定コア（４１）と、前記可動コアが上流側に移動する時に圧縮され、下流側に移動する時に拡張される第１空間（９１）と、前記可動コアが上流側に移動する時に拡張され、下流側に移動する時に圧縮される第２空間（９２）と、前記可動コアに形成され、前記第１空間と前記第２空間とを連通するコア内流路であって、前記可動コアが運動しているときは、していないときよりも前記コア内流路の流路断面積を小さくする流路制限部材（８２）を内部に有するコア内流路（８１）と、を備える。この形態によれば、第１空間と第２空間とを連通するコア内流路の流路断面積は、可動コアが運動しているときは、していないときよりも小さくなるので、第１空間と第２空間の圧力差により、可動コアの移動速度を緩和するので、可動コアの移動に伴う部材の衝突に起因する衝撃を緩和できる。さらに、部材の衝突後は、コア内流路の流路断面積は、可動コアが運動する前の状態に戻って、第１空間と第２空間の圧力差が無くなる。そのため、閉弁するときに、第１空間、第２空間の圧力差により摺動部を下降させる力が生じることでニードルが弁座に当たるときの衝撃・バウンスが却って増大してしまう、という問題を起こりにくくできる。 According to one aspect of the present disclosure, an injector (20) is provided. This injector comprises a cylindrical housing (30) in which an injection hole (32) for injecting fuel and passages (101 to 105) communicating with the injection hole are formed, and a valve body for opening and closing the injection hole. a needle (50) having (52); a movable core (42) for moving the needle; a coil (44) for generating a magnetic field for moving the movable core in the valve opening direction of the needle; A fixed core (41) is provided on the opposite side of the injection hole and regulates the movement range of the movable core, and a first core (41) is compressed when the movable core moves upstream and expands when the movable core moves downstream. a space (91); a second space (92) that is expanded when the movable core moves upstream and is compressed when it moves downstream; 2 spaces, wherein when the movable core is in motion, the flow path restricting member (82 ) inside the core channel (81). According to this aspect, the flow path cross-sectional area of the core flow path that communicates the first space and the second space is smaller when the movable core is moving than when the movable core is not moving. Since the moving speed of the movable core is reduced by the pressure difference between the space and the second space, it is possible to reduce the impact caused by the collision of the members accompanying the movement of the movable core. Furthermore, after the member collides, the cross-sectional area of the intra-core flow path returns to the state before the movable core moves, and the pressure difference between the first space and the second space disappears. Therefore, when the valve is closed, the pressure difference between the first space and the second space generates a force to lower the sliding portion, which instead increases the impact and bounce when the needle hits the valve seat. It's unlikely to happen.

本開示は、インジェクタ以外の種々の形態で実現することも可能である。例えば、燃料噴射装置や、燃料噴射方法等の形態で実現することができる。 The present disclosure can also be implemented in various forms other than injectors. For example, it can be implemented in the form of a fuel injection device, a fuel injection method, or the like.

インジェクタの概略構成図。Schematic configuration diagram of an injector. 衝撃緩和部の拡大図。FIG. 2 is an enlarged view of a shock absorbing portion; 閉弁時のインジェクタを示す説明図。Explanatory drawing which shows the injector at the time of a valve closing. コイルに通電を開始した状態のインジェクタを示す説明図。FIG. 4 is an explanatory view showing the injector in a state where energization of the coil is started; 図４における衝撃緩和部を拡大して示す説明図。FIG. 5 is an explanatory diagram showing an enlarged shock absorbing portion in FIG. 4 ; 可動コアが固定コアと衝突した状態のインジェクタを示す説明図。FIG. 4 is an explanatory diagram showing the injector in a state where the movable core has collided with the fixed core; 図６における衝撃緩和部を拡大して示す説明図である。FIG. 7 is an explanatory diagram showing an enlarged shock absorbing portion in FIG. 6 ; ニードルが慣性により上方に移動した状態のインジェクタを示す説明図。FIG. 4 is an explanatory view showing the injector in a state where the needle has moved upward due to inertia; コイルへの通電を切った状態のインジェクタを示す説明図。FIG. 4 is an explanatory diagram showing the injector in a state where the coil is de-energized; 図９における衝撃緩和部を拡大して示す説明図。FIG. 10 is an explanatory diagram showing an enlarged shock absorbing portion in FIG. 9 ; 可動コアがニードルの第２ストッパと衝突したときを示す説明図。FIG. 4 is an explanatory view showing when the movable core collides with the second stopper of the needle; 図１１における衝撃緩和部を拡大して示す説明図。FIG. 12 is an explanatory view showing an enlarged shock absorbing portion in FIG. 11; 開弁時の可動コアの加速度が、閉弁時の可動コアの加速度の大きさよりも大きい場合の流路制限部材の位置を示す説明図。FIG. 5 is an explanatory view showing the position of the flow path restricting member when the magnitude of the acceleration of the movable core when the valve is opened is greater than the magnitude of the acceleration of the movable core when the valve is closed; 可動コアが上方に加速度運動するときに、流路制限部材が収納部の内壁に接触しない場合を示す説明図。FIG. 5 is an explanatory diagram showing a case where the flow path restricting member does not contact the inner wall of the storage portion when the movable core accelerates upward; 可動コアが上方に加速度運動するときに、流路制限部材が収納部の内壁に接触する場合を示す説明図。FIG. 6 is an explanatory view showing a case where the flow path restricting member contacts the inner wall of the storage portion when the movable core accelerates upward; 第２実施形態における流路制限部材を示す説明図。FIG. 5 is an explanatory diagram showing a flow path restricting member in the second embodiment; 第３実施形態の衝撃緩和部を示す。FIG. 11 shows a shock absorbing portion of a third embodiment; FIG. コイルに電力を印加し、可動コアをニードルの開弁方向に移動させた状態を示す説明図。FIG. 4 is an explanatory view showing a state in which electric power is applied to a coil to move the movable core in the valve-opening direction of the needle; 可動コアが固定コアに接触したフルリフト状態を示す説明図。Explanatory drawing which shows the full lift state which the movable core contacted the fixed core.

・第１実施形態：
図１に示すように、第１実施形態のインジェクタ２０は、ハウジング３０と、固定コア４１と、可動コア４２と、コイル４４と、ニードル５０と、第１スプリング６１と、第２スプリング６２と、を備えている。インジェクタ２０は、燃料を噴射するための装置である。本実施形態のインジェクタ２０は、流体、特に燃料として気体の燃料ガス、例えばＬＮＧ、ＬＰＧ、水素などを噴射するのに用いられる。 ・First embodiment:
As shown in FIG. 1, the injector 20 of the first embodiment includes a housing 30, a fixed core 41, a movable core 42, a coil 44, a needle 50, a first spring 61, a second spring 62, It has The injector 20 is a device for injecting fuel. The injector 20 of the present embodiment is used to inject a fluid, particularly a gaseous fuel gas such as LNG, LPG, or hydrogen as a fuel.

ハウジング３０は、燃料を噴射する噴孔３２、および、噴孔３２に連通する流路が形成された筒状部材である。本実施形態のハウジング３０は、噴孔３２側から順に、噴孔３２が形成されたノズル部３１と、磁性体部３４と、非磁性体部３５と、磁性体部３６と、入口部３７とによって構成されている。ノズル部３１のハウジング３０内側の面には、噴孔３２の周りに弁座３３が設けられている。ノズル部３１と磁性体部３４との間、磁性体部３４と非磁性体部３５との間、非磁性体部３５と磁性体部３６との間、磁性体部３６と入口部３７との間は、それぞれ、溶接部３８において溶接されている。なお、図１では、図示の都合上、引き出し線のいくつかを省略している。 The housing 30 is a cylindrical member in which an injection hole 32 for injecting fuel and a flow path communicating with the injection hole 32 are formed. The housing 30 of the present embodiment includes, in order from the nozzle hole 32 side, a nozzle portion 31 in which the nozzle hole 32 is formed, a magnetic body portion 34, a non-magnetic body portion 35, a magnetic body portion 36, and an inlet portion 37. It is composed by A valve seat 33 is provided around the injection hole 32 on the inner surface of the housing 30 of the nozzle portion 31 . between the nozzle portion 31 and the magnetic portion 34, between the magnetic portion 34 and the non-magnetic portion 35, between the non-magnetic portion 35 and the magnetic portion 36, and between the magnetic portion 36 and the entrance portion 37. are welded at welds 38, respectively. Note that some lead lines are omitted in FIG. 1 for convenience of illustration.

本実施形態では、ノズル部３１は、非磁性材料であるマルテンサイト系ステンレス鋼によって形成されている。磁性体部３４、３６は、磁性材料であるフェライト系ステンレス鋼によって形成されている。非磁性体部３５は、非磁性材料であるオーステナイト系ステンレス鋼によって形成されている。 In this embodiment, the nozzle portion 31 is made of martensitic stainless steel, which is a non-magnetic material. The magnetic parts 34 and 36 are made of ferritic stainless steel, which is a magnetic material. The non-magnetic portion 35 is made of austenitic stainless steel, which is a non-magnetic material.

入口部３７には、インジェクタ２０に燃料を供給するための供給管（図示省略）が接続される。供給管ＦＳは、入口部３７に設けられたバックアップリング７２に接触するように接続される。供給管ＦＳと入口部３７との間は、バックアップリング７２上に設けられたＯリング７３によってシールされる。入口部３７内には、入口流路である第１流路１０１が形成されている。第１流路１０１の中には、フィルタ７１が設けられている。フィルタ７１は、供給管から供給される燃料に含まれる異物を捕集し、ハウジング３０の内部に異物が流入することを抑制する。 A supply pipe (not shown) for supplying fuel to the injector 20 is connected to the inlet portion 37 . The supply pipe FS is connected so as to come into contact with a backup ring 72 provided at the inlet portion 37 . An O-ring 73 provided on a backup ring 72 seals between the supply pipe FS and the inlet portion 37 . A first flow path 101 that is an inlet flow path is formed in the inlet portion 37 . A filter 71 is provided in the first channel 101 . The filter 71 collects foreign matter contained in the fuel supplied from the supply pipe and prevents the foreign matter from flowing into the housing 30 .

固定コア４１は、ハウジング３０の内部に固定された筒状の部材である。固定コア４１は、後述する可動コア４２の移動範囲を規制する。固定コア４１内には、第１流路１０１に連通する第２流路１０２が形成されている。本実施形態では、固定コア４１は、磁性材料であるフェライト系ステンレス鋼によって形成されている。 The fixed core 41 is a tubular member fixed inside the housing 30 . The fixed core 41 regulates the movement range of the movable core 42, which will be described later. A second channel 102 communicating with the first channel 101 is formed in the fixed core 41 . In this embodiment, the stationary core 41 is made of ferritic stainless steel, which is a magnetic material.

可動コア４２は、ハウジング３０内の固定コア４１よりも噴孔３２側にハウジング３０の軸ＡＸに沿って往復移動可能に設けられた筒状の部材である。可動コア４２は、磁性材料であるフェライト系ステンレス鋼によって形成されている磁性体可動コア４２ａと、非磁性材料であるマルテンサイト系ステンレス鋼によって形成されている非磁性体可動コア４２ｂとを有する。磁性体可動コア４２ａと非磁性体可動コア４２ｂとは、一体に接合されている。磁性体可動コア４２ａは、軸ＡＸと垂直な断面の外径が、固定コア４１の外径より僅かに小さい略筒状の部材であり、軸ＡＸに沿って移動したときに固定コア４１と接触可能に構成されている。磁性体可動コア４２ａの固定コア４１と接触する接触部を「第１当接部」４２１と呼ぶ。 The movable core 42 is a cylindrical member provided in the housing 30 on the nozzle hole 32 side of the fixed core 41 so as to be reciprocally movable along the axis AX of the housing 30 . The movable core 42 has a magnetic movable core 42a made of ferritic stainless steel, which is a magnetic material, and a non-magnetic movable core 42b made of martensitic stainless steel, which is a non-magnetic material. The magnetic movable core 42a and the non-magnetic movable core 42b are joined integrally. The magnetic movable core 42a is a substantially cylindrical member whose outer diameter in a cross section perpendicular to the axis AX is slightly smaller than the outer diameter of the fixed core 41, and contacts the fixed core 41 when moved along the axis AX. configured as possible. A contact portion of the magnetic movable core 42 a that contacts the fixed core 41 is called a “first contact portion” 421 .

非磁性体可動コア４２ｂは、磁性体可動コア４２ａの内側に設けられた部材であり、筒状の筒部４２ｂｔと、筒部４２ｂｔから外縁側に突き出たフランジ部４２ｂｆとを備える。筒部４２ｂｔは、固定コア４１の内径よりも小さな外径を有しており、軸ＡＸに沿って移動しても固定コア４１と接触しない。筒部４２ｂｔは、軸ＡＸに沿った貫通孔４３を有しており、貫通孔４３には、後述するニードル５０が挿入されている。フランジ部４２ｂｆの外径は、磁性体可動コア４２ａの外径と同じ大きさであり、フランジ部４２ｂｆは、磁性体可動コア４２ａの、固定コア４１と反対側に接合されている。そのため、磁性体可動コア４２ａは、コイル４４の磁力により移動する時に、フランジ部４２ｂｆを移動させるので、非磁性体可動コア４２ｂも同時に移動する。本実施形態では、可動コア４２は、磁性体可動コア４２ａとフランジ部４２ｂｆに、内部に衝撃緩和部８０を有する。衝撃緩和部８０の構成については、後述する。 The nonmagnetic movable core 42b is a member provided inside the magnetic movable core 42a, and includes a tubular portion 42bt and a flange portion 42bf protruding from the tubular portion 42bt to the outer edge side. The tubular portion 42bt has an outer diameter smaller than the inner diameter of the fixed core 41 and does not come into contact with the fixed core 41 even when moved along the axis AX. The cylindrical portion 42bt has a through hole 43 along the axis AX, and a needle 50, which will be described later, is inserted into the through hole 43. As shown in FIG. The outer diameter of the flange portion 42bf is the same as the outer diameter of the magnetic movable core 42a, and the flange portion 42bf is joined to the opposite side of the fixed core 41 of the magnetic movable core 42a. Therefore, when the magnetic movable core 42a is moved by the magnetic force of the coil 44, the flange portion 42bf is moved, so the non-magnetic movable core 42b is also moved at the same time. In this embodiment, the movable core 42 has a shock absorbing portion 80 inside the magnetic movable core 42a and the flange portion 42bf. The configuration of the shock absorbing portion 80 will be described later.

可動コア４２の上流側に設けられた、固定コア４１と可動コア４２とハウジング３０に囲われた空間を「第１空間」９１と呼び、可動コア４２の下流側に設けられた、可動コア４２の筒部４２ｂｔと可動コア４２のフランジ部４２ｂｆとハウジング３０に囲われた空間を「第２空間」９２と呼ぶ。後述するように、第１空間９１と第２空間９２の圧力差が存在すると、どちらの空間の圧力が大きいかにより、可動コア４２は、上昇方向、あるいは、下降方向の力を受ける。 A space surrounded by the fixed core 41, the movable core 42, and the housing 30 provided on the upstream side of the movable core 42 is called a "first space" 91, and the movable core 42 provided on the downstream side of the movable core 42 A space surrounded by the cylindrical portion 42bt of the movable core 42, the flange portion 42bf of the movable core 42, and the housing 30 is called a "second space" 92. As shown in FIG. As will be described later, if there is a pressure difference between the first space 91 and the second space 92, the movable core 42 receives upward or downward force depending on which space has the greater pressure.

コイル４４は、ハウジング３０の外周に巻回されている。コイル４４の外周は、磁性材料であるフェライト系ステンレス鋼によって形成されたヨーク４５によって覆われている。コイル４４は、通電されると、可動コア４２を固定コア４１側に向かって移動させる磁界φを発生する。可動コア４２が固定コア４１側に移動すると、後述するように、ニードル５０を開弁方向に移動させる。コイル４４に流れる電流は、例えば、バッテリ等の電力供給源（図示省略）から供給される。電力供給源から印加される電圧は、制御部（図示省略）によって制御される。 Coil 44 is wound around the outer circumference of housing 30 . The outer circumference of the coil 44 is covered with a yoke 45 made of ferritic stainless steel, which is a magnetic material. When the coil 44 is energized, it generates a magnetic field φ that moves the movable core 42 toward the fixed core 41 side. When the movable core 42 moves toward the fixed core 41, the needle 50 is moved in the valve opening direction, as will be described later. The current flowing through the coil 44 is supplied from a power supply source (not shown) such as a battery, for example. The voltage applied from the power supply source is controlled by a controller (not shown).

ニードル５０は、軸部５１と、弁体５２と、第１ストッパ５３と、第２ストッパ５４と、を備えている。軸部５１は、可動コア４２の貫通孔４３に、軸ＡＸに沿って往復移動可能に設けられている。軸部５１の中心軸は、軸ＡＸと同じであり、固定コア４１の中心軸および可動コア４２の中心軸と同じである。 The needle 50 includes a shaft portion 51 , a valve body 52 , a first stopper 53 and a second stopper 54 . The shaft portion 51 is provided in the through hole 43 of the movable core 42 so as to be able to reciprocate along the axis AX. The central axis of shaft portion 51 is the same as axis AX, and is the same as the central axis of fixed core 41 and the central axis of movable core 42 .

弁体５２は、軸部５１の噴孔３２側の端部に形成されている。弁体５２は、ノズル部３１に設けられた弁座３３と接触可能に構成されており、軸部５１が軸ＡＸに沿って往復移動することによって噴孔３２を開閉する。弁体５２は、非磁性材料であるマルテンサイト系ステンレス鋼によって形成されている。 The valve body 52 is formed at the end of the shaft portion 51 on the injection hole 32 side. The valve body 52 is configured to be able to come into contact with the valve seat 33 provided in the nozzle portion 31 , and opens and closes the injection hole 32 by reciprocating the shaft portion 51 along the axis AX. The valve body 52 is made of martensitic stainless steel, which is a non-magnetic material.

第１ストッパ５３は、軸部５１の弁体５２と反対側の端部に設けられている。第１ストッパ５３は、略円盤状部材であり、第１ストッパ５３の外径は、可動コア４２の貫通孔４３の径よりも大きく、固定コア４１の内径よりも少し小さい。そのため、第１ストッパ５３は、固定コア４１とは接触しないが可動コア４２と接触可能である。第１ストッパ５３の可動コア４２との接触部を「第２当接部」５３１と呼ぶ。本実施形態では、軸部５１と第１ストッパ５３は、非磁性材料であるマルテンサイト系ステンレス鋼によって形成されている。 The first stopper 53 is provided at the end of the shaft portion 51 opposite to the valve body 52 . The first stopper 53 is a substantially disk-shaped member, and the outer diameter of the first stopper 53 is larger than the diameter of the through hole 43 of the movable core 42 and slightly smaller than the inner diameter of the fixed core 41 . Therefore, the first stopper 53 does not contact the fixed core 41 but can contact the movable core 42 . A contact portion of the first stopper 53 with the movable core 42 is called a “second contact portion” 531 . In this embodiment, the shaft portion 51 and the first stopper 53 are made of martensitic stainless steel, which is a non-magnetic material.

第２ストッパ５４は、可動コア４２の軸ＡＸ方向の長さよりも少し長い長さだけ第１ストッパ５３から弁体５２方向に離れた位置において、軸部５１から外側向けて突き出ている円盤形状の部材である。第２ストッパ５４の外径は、貫通孔４３の径よりも大きい。そのため、第２ストッパ５４は、可動コア４２の筒部４２ｂｔと接触可能である。第２ストッパ５４の可動コア４２との接触面を「第３当接部」５４１と呼ぶ。可動コア４２は、第１ストッパ５３と第２ストッパ５４との間に挟まれており、第２当接部５３１と第３当接部５４１との間の軸ＡＸに沿った間隔は、可動コア４２の軸ＡＸに沿った長さよりも大きい。本実施形態では、第２ストッパ５４は、非磁性材料であるオーステナイト系ステンレス鋼によって形成されており、軸部５１に圧入されている。 The second stopper 54 is disc-shaped and protrudes outward from the shaft portion 51 at a position away from the first stopper 53 in the direction of the valve body 52 by a length slightly longer than the length of the movable core 42 in the direction of the axis AX. It is a member. The outer diameter of the second stopper 54 is larger than the diameter of the through hole 43 . Therefore, the second stopper 54 can come into contact with the tubular portion 42bt of the movable core 42 . A contact surface of the second stopper 54 with the movable core 42 is called a “third contact portion” 541 . The movable core 42 is sandwiched between the first stopper 53 and the second stopper 54, and the distance along the axis AX between the second contact portion 531 and the third contact portion 541 is the movable core 42 greater than the length along the axis AX. In this embodiment, the second stopper 54 is made of austenitic stainless steel, which is a non-magnetic material, and is press-fitted into the shaft portion 51 .

軸部５１の内部には、第２流路１０２に接続される第３流路１０３が形成されている。軸部５１の外側と、ハウジング３０のノズル部３１の内側と、の間には、第４流路１０４が形成されている。第３流路１０３は、第２ストッパ５４よりも下流側において、連通路１０５により第４流路１０４に連通している。噴孔３２が開弁されたときには、燃料は、第１流路１０１から第２流路１０２、第３流路１０３、連通路１０５、第４流路１０４の順にハウジング３０内を流れ、噴孔３２から噴射される。 A third flow path 103 connected to the second flow path 102 is formed inside the shaft portion 51 . A fourth flow path 104 is formed between the outside of the shaft portion 51 and the inside of the nozzle portion 31 of the housing 30 . The third flow path 103 communicates with the fourth flow path 104 through a communication path 105 on the downstream side of the second stopper 54 . When the nozzle hole 32 is opened, the fuel flows through the housing 30 in the order from the first flow path 101 to the second flow path 102, the third flow path 103, the communication path 105, and the fourth flow path 104. It is jetted from 32.

第１スプリング６１は、第２流路１０２内に配置されている。第１スプリング６１は、ニードル５０の第１ストッパ５３に対し、固定コア４１側から噴孔３２に向かう力を加える。この第１スプリング６１により、ニードル５０の弁体５２は、弁座３３に着座し、噴孔３２が閉弁する。本実施形態では、第１スプリング６１は、コイルばねである。第２流路１０２における第１スプリング６１よりも上流側には、アジャスティングパイプ６３が設けられている。アジャスティングパイプ６３の噴孔３２側における端部の位置を調節することによって、第１スプリング６１が第１ストッパ５３を噴口３２側に押す力を調節することができる。 The first spring 61 is arranged inside the second flow path 102 . The first spring 61 applies force to the first stopper 53 of the needle 50 from the fixed core 41 side toward the nozzle hole 32 . The valve body 52 of the needle 50 is seated on the valve seat 33 by the first spring 61, and the nozzle hole 32 is closed. In this embodiment, the first spring 61 is a coil spring. An adjusting pipe 63 is provided upstream of the first spring 61 in the second flow path 102 . By adjusting the position of the end of the adjusting pipe 63 on the nozzle hole 32 side, the force of the first spring 61 pushing the first stopper 53 toward the nozzle hole 32 can be adjusted.

第２スプリング６２は、第２空間９２内に配置され、フランジ部４２ｂｆを固定コア４１方向に押すことで、可動コア４２を噴孔３２側から固定コア４１方向に押す。本実施形態の第２スプリング６２は、コイルばねである。閉弁状態では、第１スプリング６１が第１ストッパ５３を介してニードル５０の弁体５２を弁座の接触させることで噴孔３２を閉じさせ、第２スプリング６２が可動コア４２を第１ストッパ５３に接触させている。 The second spring 62 is arranged in the second space 92 and pushes the movable core 42 toward the fixed core 41 from the injection hole 32 side by pushing the flange portion 42bf toward the fixed core 41 . The second spring 62 of this embodiment is a coil spring. In the valve closed state, the first spring 61 closes the nozzle hole 32 by bringing the valve body 52 of the needle 50 into contact with the valve seat via the first stopper 53, and the second spring 62 moves the movable core 42 to the first stopper. 53 is in contact.

図２を用いて、衝撃緩和部８０について説明する。衝撃緩和部８０は、可動コア４２の磁性体可動コア４２ａ及びフランジ部４２ｂｆを中心とした領域に形成されている。衝撃緩和部８０は、第１空間９１と、第２空間９２と、コア内流路８１と、流路制限部材８２と、２つの弾性体８３、８４とを備える。２つの弾性体８３、８４を区別する場合には、弾性体８３を「第１弾性体」８３と呼び、弾性体８４を「第２弾性体」８４と呼ぶ。コア内流路８１は、可動コア４２に形成されており、第１空間９１と第２空間９２とを連通している。コア内流路８１は、流路制限部材８２を収納する収納部８１３と、収納部８１３よりも第１空間９１側の第１空間側流路部８１１と、収納部８１３よりも第２空間９２側の第２空間側流路部８１２と、を備える。流路制限部材８２は、弾性体８３、８４により収納部８１３内に支持されている。弾性体８３、８４は、各種バネやゴムで形成可能である。固定コア４１は、可動コア４２と接する面に溝４１ｇを有する。溝４１ｇは、可動コア４２が固定コア４１方向に移動して固定コア４１と接触した状態でも、第２流路１０２とコア内流路８１との間を連通する流路を形成する。溝は、可動コア４２の固定コア４１と接する面に形成されていても良い。 The shock absorbing portion 80 will be described with reference to FIG. The shock absorbing portion 80 is formed in a region around the magnetic movable core 42 a and the flange portion 42 bf of the movable core 42 . The shock absorbing portion 80 includes a first space 91 , a second space 92 , an in-core channel 81 , a channel restricting member 82 , and two elastic bodies 83 and 84 . When distinguishing between the two elastic bodies 83 , 84 , the elastic body 83 is called the “first elastic body” 83 and the elastic body 84 is called the “second elastic body” 84 . The intra-core flow path 81 is formed in the movable core 42 and communicates the first space 91 and the second space 92 . The in-core channel 81 includes a storage portion 813 that stores the channel restricting member 82 , a first space side channel portion 811 that is closer to the first space 91 than the storage portion 813 , and a second space 92 that is closer to the storage portion 813 . and a second space-side channel portion 812 on the side. The flow path restricting member 82 is supported inside the housing portion 813 by elastic bodies 83 and 84 . The elastic bodies 83 and 84 can be made of various springs or rubbers. The fixed core 41 has a groove 41g on the surface in contact with the movable core 42 . The groove 41g forms a flow path that communicates between the second flow path 102 and the in-core flow path 81 even when the movable core 42 moves toward the fixed core 41 and is in contact with the fixed core 41 . The groove may be formed on the surface of the movable core 42 that contacts the fixed core 41 .

図２は可動コア４２が静止し、加速度が掛かっていない状態を示している。流路制限部材８２は、弾性体８３、８４から受ける力がバランスする位置、例えば、収納部８１３の略中央に位置し、収納部８１３の内壁と接触していない。この状態では、収納部８１３の中の流路制限部材８２の第１空間側流路部８１１側の流路８２ａと、流路制限部材８２の第２空間側流路部８１２側の流路８２ｂとは、いずれも開いている。したがって、第１空間９１と第２空間とは、第１空間側流路部８１１、流路８２ａ、収納部８１３、流路８２ｂ、第２空間側流路部８１２を介して連通し、第１空間９１から第２空間９２へ、あるいは、第２空間９２から第１空間９１へ燃料が流れ、第１空間９１と第２空間の圧力は、同じになる。 FIG. 2 shows a state in which the movable core 42 is stationary and no acceleration is applied. The flow path restricting member 82 is positioned at a position where the forces received from the elastic bodies 83 and 84 are balanced, for example, substantially in the center of the housing portion 813 and is not in contact with the inner wall of the housing portion 813 . In this state, the flow channel 82a on the first space side flow channel portion 811 side of the flow channel limiting member 82 in the storage portion 813 and the flow channel 82b on the second space side flow channel portion 812 side of the flow channel limiting member 82 and are all open. Therefore, the first space 91 and the second space communicate with each other through the first space-side channel portion 811, the channel 82a, the storage portion 813, the channel 82b, and the second space-side channel portion 812. Fuel flows from the space 91 to the second space 92 or from the second space 92 to the first space 91, and the pressures of the first space 91 and the second space become the same.

可動コア４２が加速度運動しても、流路制限部材８２は、慣性により、その位置を維持する。その結果、収納部８１３における流路制限部材８２の相対的な位置が変化し、流路８２ａ、８２ｂの流路断面積を変える。例えば、可動コア４２が下方に加速度運動した場合、流路制限部材８２が収納部８１３の第１空間側流路部８１１に近い位置に相対的に移動し、流路８２ａの流路断面積が小さくなり、流路８２ｂの流路断面積が大きくなる。一方、可動コア４２が上方に加速度運動した場合、流路制限部材８２が収納部８１３の第２空間側流路部８１２に近い位置に相対的に移動し、流路８２ｂの流路断面積が小さくなり、流路８２ａの流路断面積が大きくなる。第１空間９１と第２空間との間で燃料が流れる速度は、流路断面積の狭い方で律速される。したがって、第１空間９１と第２空間９２との間に圧力差が生じた場合、流路８２ａ、８２ｂのいずれかの流路断面積が狭い場合には、燃料が流れ難いため、第１空間９１と第２空間９２との間の圧力差は、流路制限部材８２が移動しない場合より長時間維持される。 Even if the movable core 42 accelerates, the flow path restricting member 82 maintains its position due to inertia. As a result, the relative position of the flow path restricting member 82 in the storage portion 813 changes, changing the flow path cross-sectional areas of the flow paths 82a and 82b. For example, when the movable core 42 accelerates downward, the flow path restricting member 82 relatively moves to a position close to the first space side flow path section 811 of the storage section 813, and the flow path cross-sectional area of the flow path 82a increases. As a result, the cross-sectional area of the flow path 82b increases. On the other hand, when the movable core 42 accelerates upward, the flow path restricting member 82 relatively moves to a position near the second space side flow path section 812 of the storage section 813, and the flow path cross-sectional area of the flow path 82b increases. As a result, the flow channel cross-sectional area of the flow channel 82a increases. The speed at which fuel flows between the first space 91 and the second space is controlled by the narrower cross-sectional area of the flow path. Therefore, when there is a pressure difference between the first space 91 and the second space 92, if the flow channel cross-sectional area of one of the flow channels 82a and 82b is small, the fuel is difficult to flow. The pressure difference between 91 and the second space 92 is maintained for a longer time than when the flow path restricting member 82 does not move.

図３は、インジェクタ２０が閉弁している状態を示し、図１の固定コア４１の下流側から噴孔３２までを拡大して示している。図３に示す状態では、コイル４４（図１）に電力が通電されていない。そのため、ニードル５０の第１ストッパ５３は第１スプリング６１に押され、ニードル５０の弁体５２は弁座３３に着座し、噴孔３２は閉弁している。可動コア４２は、第２スプリング６２によって第１ストッパ５３方向に押され、第１ストッパ５３と接触している。可動コア４２は静止状態であり、可動コア４２には加速度がかかっていない。流路制限部材８２は、弾性体８３、８４から受ける力がバランスする位置である収納部８１３のほぼ中央に位置している。 FIG. 3 shows a state in which the injector 20 is closed, and shows an enlarged view from the downstream side of the fixed core 41 in FIG. 1 to the injection hole 32 . In the state shown in FIG. 3, the coil 44 (FIG. 1) is not energized. Therefore, the first stopper 53 of the needle 50 is pushed by the first spring 61, the valve body 52 of the needle 50 is seated on the valve seat 33, and the nozzle hole 32 is closed. The movable core 42 is pushed toward the first stopper 53 by the second spring 62 and is in contact with the first stopper 53 . The movable core 42 is in a stationary state and no acceleration is applied to the movable core 42 . The flow path restricting member 82 is positioned substantially in the center of the housing portion 813 where the forces received from the elastic bodies 83 and 84 are balanced.

図４は、コイル４４に通電を開始した状態を示す。可動コア４２は、コイル４４から受ける磁力Ｆｍによって上方、すなわち固定コア４１に近づくように移動する。このとき、可動コア４２は第１ストッパ５３を上方に移動させ、ニードル５０も上方に移動させる。その結果、弁体５２が弁座３３から離間し、インジェクタ２０が開弁する。燃料は、矢印で示すように、第２流路１０２から、第３流路１０３、連通路１０５、第４流路１０４の順にハウジング３０内を流れ、噴孔３２から噴射される。可動コア４２が上方に移動するため、通電前に比べて、第２空間９２の容積は大きくなり、第２空間９２の圧力は低下する。その結果、第１空間９１と第２空間９２の圧力差が生じる。この圧力差は、可動コア４２の上昇速度を減少させる方向に働く。 FIG. 4 shows a state in which energization of the coil 44 is started. Movable core 42 moves upward, that is, closer to fixed core 41 by magnetic force Fm received from coil 44 . At this time, the movable core 42 moves the first stopper 53 upward and also moves the needle 50 upward. As a result, the valve body 52 is separated from the valve seat 33 and the injector 20 is opened. Fuel flows through the housing 30 in the order of the second flow path 102 , the third flow path 103 , the communication path 105 and the fourth flow path 104 and is injected from the injection hole 32 as indicated by the arrows. Since the movable core 42 moves upward, the volume of the second space 92 increases and the pressure in the second space 92 decreases compared to before the energization. As a result, a pressure difference is generated between the first space 91 and the second space 92 . This pressure difference works in the direction of decreasing the rising speed of the movable core 42 .

図５は、図４における衝撃緩和部８０を拡大して示す説明図である。可動コア４２が静止状態から上方に移動しても、流路制限部材８２は、慣性により、そのままの状態を維持しようとする。その結果、流路制限部材８２は、収納部８１３の中で、相対的に第２空間９２の側に移動し、流路８２ｂの流路断面積を小さくする。第１空間９１と第２空間９２との間の圧力差は、第１空間９１から第２空間９２に燃料が流れることで解消される。しかし、流路８２ｂの流路断面積が小さくなっているため、第１空間９１から第２空間９２に燃料が流れにくくなっている。そのため、通電開始後の一定期間は、第１空間９１と第２空間９２の圧力差は、解消せず、可動コア４２の上昇速度が低下させる。 FIG. 5 is an explanatory diagram showing an enlarged view of the shock absorbing portion 80 in FIG. 4. As shown in FIG. Even if the movable core 42 moves upward from the stationary state, the flow path restricting member 82 tries to maintain the state as it is due to inertia. As a result, the flow path restricting member 82 relatively moves toward the second space 92 in the storage portion 813, thereby reducing the cross-sectional area of the flow path 82b. The pressure difference between the first space 91 and the second space 92 is eliminated by the fuel flowing from the first space 91 to the second space 92 . However, since the channel cross-sectional area of the channel 82b is small, it is difficult for the fuel to flow from the first space 91 to the second space 92. As shown in FIG. Therefore, the pressure difference between the first space 91 and the second space 92 does not disappear for a certain period of time after the start of energization, and the rising speed of the movable core 42 decreases.

図６は、可動コア４２が固定コア４１と衝突したときを示す説明図である。上述したように、衝撃緩和部８０により、第１空間９１と第２空間９２の圧力差が生じ、可動コア４２の上昇速度が低下させられているので、衝撃緩和部８０を備えない場合に比べて、可動コア４２が固定コア４１に衝突したときの衝撃を小さくできる。 FIG. 6 is an explanatory diagram showing when the movable core 42 collides with the fixed core 41. As shown in FIG. As described above, the shock absorbing portion 80 causes a pressure difference between the first space 91 and the second space 92, and the rising speed of the movable core 42 is reduced. Therefore, the impact when the movable core 42 collides with the fixed core 41 can be reduced.

また、可動コア４２が固定コア４１と衝突したときの衝撃は、可動コア４２の質量によるものに限定され、比較的小さい。 Also, the impact when the movable core 42 collides with the fixed core 41 is limited to the mass of the movable core 42 and is relatively small.

図７は、図６における衝撃緩和部８０を拡大して示す説明図である。可動コア４２に加速度がかからなくなると、流路制限部材８２は、弾性体８３、８４から受ける力がバランスする位置である収納部８１３のほぼ中央に位置に戻る。そのため、流路８２ｂの流路断面積は、閉弁時と同じ大きさに戻る。この場合、燃料が第２流路１０２から溝４１ｇ、コア内流路８１を経て第２空間９２に流入するので、第２空間９２の圧力は、第１空間９１の圧力とほぼ同じ圧力に速やかに戻る。 FIG. 7 is an explanatory diagram showing an enlarged view of the shock absorbing portion 80 in FIG. When the acceleration is no longer applied to the movable core 42, the flow path restricting member 82 returns to a position substantially in the center of the housing portion 813 where the forces received from the elastic bodies 83 and 84 are balanced. Therefore, the channel cross-sectional area of the channel 82b returns to the same size as when the valve was closed. In this case, since the fuel flows from the second flow path 102 through the groove 41g and the inner core flow path 81 into the second space 92, the pressure in the second space 92 quickly reaches almost the same pressure as the pressure in the first space 91. back to

図８は、ニードル５０が慣性によりさらに上方に移動し、ニードル５０の第２ストッパ５４が可動コア４２に衝突したときを示す説明図である。ニードル５０の第２ストッパ５４が可動コア４２に衝突したときの衝撃は、ニードル５０の質量によるものに限定され、比較的小さい。 FIG. 8 is an explanatory diagram showing the needle 50 moving further upward due to inertia, and the second stopper 54 of the needle 50 colliding with the movable core 42 . The impact when the second stopper 54 of the needle 50 collides with the movable core 42 is limited to the mass of the needle 50 and is relatively small.

図９は、コイル４４への通電を切って開弁状態から閉弁状態に切り替えた状態を示す。コイル４４への通電が切られると、第１スプリング６１の付勢力Ｆｓｐが第１ストッパ５３を介してニードル５０を下方に移動させる。その結果、ニードル５０の弁体５２が弁座３３に着座し、噴孔３２が閉弁する。ニードル５０の第１ストッパ５３は、可動コア４２を、下方に移動させるので、通電状態に比べて第２空間９２の容積が減少し、第２空間９２の圧力は増大する。その結果、第１空間９１と第２空間９２の圧力差が生じ、可動コア４２の下降速度が低く抑えられる。可動コア４２の下降速度が低下させられているので、ニードル５０の弁体５２が弁座３３に着座する時の衝撃を小さくできる。 FIG. 9 shows a state in which the coil 44 is de-energized to switch from the valve open state to the valve closed state. When the coil 44 is de-energized, the biasing force Fsp of the first spring 61 moves the needle 50 downward via the first stopper 53 . As a result, the valve body 52 of the needle 50 is seated on the valve seat 33 and the nozzle hole 32 is closed. Since the first stopper 53 of the needle 50 moves the movable core 42 downward, the volume of the second space 92 decreases and the pressure in the second space 92 increases compared to the energized state. As a result, a pressure difference is generated between the first space 91 and the second space 92, and the lowering speed of the movable core 42 is suppressed. Since the downward speed of the movable core 42 is reduced, the impact when the valve element 52 of the needle 50 is seated on the valve seat 33 can be reduced.

ニードル５０の弁体５２が弁座３３に衝突した場合、ニードル５０はこれ以上、下方に移動しない。しかし、可動コア４２は、ニードル５０の弁体５２が弁座３３により停止させられても、慣性により下方に移動する。そのため、ニードル５０の弁体５２が弁座３３に衝突したときの弁座３３が受ける衝撃は、ニードル５０の質量によるものに限定され、比較的小さい。 When the valve body 52 of the needle 50 collides with the valve seat 33, the needle 50 does not move downward any further. However, the movable core 42 moves downward due to inertia even when the valve body 52 of the needle 50 is stopped by the valve seat 33 . Therefore, the impact received by the valve seat 33 when the valve body 52 of the needle 50 collides with the valve seat 33 is limited to the mass of the needle 50 and is relatively small.

図１０は、図９における衝撃緩和部８０を拡大して示す説明図である。可動コア４２が静止状態から下方に移動しても、流路制限部材８２は、慣性により、そのままの状態を維持しようとする。その結果、流路制限部材８２は、慣性により、収納部８１３の中で、相対的に第１空間９１側に移動し、流路８２ａの流路断面積を小さくする。第１空間９１と第２空間９２との間の圧力差は、第２空間９２から第１空間９１に燃料が流れ出ることで解消される。しかし、流路８２ａの流路断面積が小さくなっているため、第２空間９２から第１空間９１に燃料が流れにくくなっている。そのため、通電オフ後の一定期間は、第１空間９１と第２空間９２の圧力差は、解消せず、可動コア４２の下降速度が低く抑えられる。 FIG. 10 is an explanatory diagram showing an enlarged view of the shock absorbing portion 80 in FIG. 9. As shown in FIG. Even if the movable core 42 moves downward from the stationary state, the flow path restricting member 82 tries to maintain the state as it is due to inertia. As a result, the flow path restricting member 82 moves relatively toward the first space 91 in the storage portion 813 due to inertia, thereby reducing the cross-sectional area of the flow path 82a. The pressure difference between the first space 91 and the second space 92 is eliminated by the fuel flowing out from the second space 92 to the first space 91 . However, since the channel cross-sectional area of the channel 82a is small, it is difficult for the fuel to flow from the second space 92 to the first space 91 . Therefore, the pressure difference between the first space 91 and the second space 92 does not disappear for a certain period of time after the energization is turned off, and the lowering speed of the movable core 42 is kept low.

図１１は、可動コア４２がニードル５０の第２ストッパ５４と衝突したときを示す説明図である。可動コア４２がニードル５０の第２ストッパ５４に衝突したときの衝撃は、ニードル５０を介して弁座３３に伝わる。このときの衝撃は、可動コア４２の質量によるものに限定され比較的小さい。 FIG. 11 is an explanatory view showing when the movable core 42 collides with the second stopper 54 of the needle 50. As shown in FIG. The impact when the movable core 42 collides with the second stopper 54 of the needle 50 is transmitted to the valve seat 33 via the needle 50 . The impact at this time is limited to the mass of the movable core 42 and is relatively small.

図１２は、図１１における衝撃緩和部８０を拡大して示す説明図である。流路制限部材８２は、弾性体８３、８４から受ける力がバランスする位置である収納部８１３のほぼ中央に位置に戻る。そのため、流路８２ａの流路断面積は、図２や図７に示す状態と同じになっている。また、第２空間９２の圧力は、第２空間９２からコア内流路８１、溝４１ｇを経て第２流路１０２からに燃料ガスが流れ出すことで、第１空間９１の圧力とほぼ同じ圧力に速やかに戻る。 FIG. 12 is an explanatory diagram showing an enlarged view of the shock absorbing portion 80 in FIG. 11. As shown in FIG. The flow path restricting member 82 returns to a position substantially in the center of the housing portion 813 where the forces received from the elastic bodies 83 and 84 are balanced. Therefore, the channel cross-sectional area of the channel 82a is the same as the states shown in FIGS. Further, the pressure in the second space 92 becomes substantially the same as the pressure in the first space 91 by the fuel gas flowing out from the second space 92 through the inner core channel 81 and the groove 41g and out of the second channel 102. return promptly.

以上説明したように、第１実施形態によれば、インジェクタ２０は、可動コア４２が上流側に移動する時に圧縮され、下流側に移動する時に拡張される第１空間９１と、可動コア４２が上流側に移動する時に拡張され、下流側に移動する時に圧縮される第２空間９２と、可動コア４２に形成され、第１空間９１と第２空間９２とを連通するコア内流路８１であって、可動コア４２が加速度運動しているときは、していないときよりも流路断面積が小さくなるコア内流路８１を備えるので、コア内流路８１の流路断面積を絞ることで、一定の期間、第１空間９１と第２空間９２の圧力差を生じさせ、可動コア４２の移動速度を低減する。その結果、開弁時に、可動コア４２が固定コア４１に衝突するときの衝撃や、閉弁時にニードル５０の弁体５２が弁座３３に衝突するときに衝撃を緩和できる。その結果、弁体５２、弁座３３、第１ストッパ５３、第２ストッパ５４、可動コア４２、固定コア４１の当接部分の摩耗を抑制できる。 As described above, according to the first embodiment, the injector 20 is compressed when the movable core 42 moves upstream, and expands when it moves downstream, and the movable core 42 and the first space 91 are compressed. A second space 92 that expands when moving upstream and is compressed when moving downstream, and an intra-core flow path 81 formed in the movable core 42 and communicating between the first space 91 and the second space 92. When the movable core 42 is accelerating, the cross-sectional area of the core internal flow path 81 becomes smaller than when the movable core 42 is not moving. , a pressure difference is generated between the first space 91 and the second space 92 for a certain period of time to reduce the moving speed of the movable core 42 . As a result, the impact when the movable core 42 collides with the fixed core 41 when the valve is opened and the impact when the valve body 52 of the needle 50 collides with the valve seat 33 when the valve is closed can be reduced. As a result, wear of the contact portions of the valve body 52, the valve seat 33, the first stopper 53, the second stopper 54, the movable core 42, and the fixed core 41 can be suppressed.

第１実施形態によれば、衝撃緩和部８０は、コア内流路８１の収納部８１３に配置された流路制限部材８２と、流路制限部材８２を支持する弾性体８３、８４とを有している。流路制限部材８２の位置は、開弁直後に、収納部８１３内の相対的な位置を変え、第２空間９２側に相対的に移動した後、元の位置に戻る。すなわち、流路８２ｂの流路断面積は、一旦小さくなった後、元の流路断面積に戻る。流路８２ｂの流路断面積を狭くするだけでは、開弁から閉弁までのタイミングが短い場合には、第２空間９２の圧力が元の状態に戻る前に閉弁する場合が生じ、第１空間９１と第２空間９２の圧力差が残っているため、ニードル５０の下降速度が上昇し、弁座３３が受ける衝撃が却って大きくなる場合が有り得る。しかし、第１実施形態によれば、流路８２ｂの流路断面積は、一旦小さくなった後、元の流路断面積に戻るので、開弁から閉弁までのタイミングが短くても、流路８２ｂの流路断面積が元の流路断面積に戻ることで、第１空間９１から第２空間９２に燃料が流れ、第１空間９１と第２空間９２の圧力差がなくなっている。その結果、開弁から閉弁までのタイミングが短い場合でも、閉弁時には、第１空間９１と第２空間９２の圧力差によるニードル５０の下降速度の上昇が発生せず、弁座３３が受ける衝撃が却って大きくなることも発生しない。なお、閉弁から次の開弁までの時間が短い場合も、第１空間９１と第２空間９２の圧力差が解消しているので、可動コア４２の上昇速度が上昇して可動コア４２や固定コア４１が受ける衝撃が却って大きくなることを発生し難くできる。 According to the first embodiment, the shock absorbing portion 80 has the flow path restricting member 82 arranged in the storage portion 813 of the core internal flow path 81 and the elastic bodies 83 and 84 that support the flow path restricting member 82 . are doing. Immediately after the valve is opened, the flow path restricting member 82 changes its relative position within the storage section 813, moves relatively toward the second space 92, and then returns to its original position. That is, the channel cross-sectional area of the channel 82b returns to the original channel cross-sectional area after being once reduced. If the timing from the valve opening to the valve closing is short, the valve may close before the pressure in the second space 92 returns to its original state only by narrowing the flow passage cross-sectional area of the flow passage 82b. Since the pressure difference between the 1st space 91 and the 2nd space 92 remains, the downward speed of the needle 50 increases, and the impact received by the valve seat 33 may rather increase. However, according to the first embodiment, the flow path cross-sectional area of the flow path 82b returns to the original flow path cross-sectional area after being once reduced. Since the cross-sectional area of the passage 82b returns to the original cross-sectional area, the fuel flows from the first space 91 to the second space 92, and the pressure difference between the first space 91 and the second space 92 disappears. As a result, even if the timing from the valve opening to the valve closing is short, when the valve is closed, the lowering speed of the needle 50 does not increase due to the pressure difference between the first space 91 and the second space 92, and the valve seat 33 receives the pressure. It does not occur that the impact is rather large. Note that even if the time from closing the valve to opening the next valve is short, the pressure difference between the first space 91 and the second space 92 is eliminated, so the rising speed of the movable core 42 increases and the movable core 42 and It is possible to make it difficult for the impact that the fixed core 41 receives to become rather large.

第１実施形態によれば、ニードル５０を可動コア４２に対して相対的に移動できるように構成しているので、開弁時における可動コア４２が固定コア４１に衝突したときの衝撃を、可動コア４２のみから受ける衝撃と、ニードル５０のみから受ける衝撃と、に分散し、衝撃のピークを低減する。また、閉弁時におけるニードル５０の弁体５２が弁座３３に衝突したときの衝撃を、ニードル５０のみから受ける衝撃と、可動コア４２のみから受ける衝撃と、に分散し、衝撃のピークを低減できる。 According to the first embodiment, since the needle 50 is configured to be movable relative to the movable core 42, the impact when the movable core 42 collides with the fixed core 41 when the valve is opened is The shock received only from the core 42 and the shock received only from the needle 50 are dispersed to reduce the peak of the shock. Also, the impact when the valve body 52 of the needle 50 collides with the valve seat 33 when the valve is closed is dispersed into the impact received only from the needle 50 and the impact received only from the movable core 42, thereby reducing the peak of the impact. can.

・変形例１：
第１実施形態では、流路制限部材８２の初期位置を、収納部８１３のほぼ中央の位置としているが、図１３に示す変形例１では、流路制限部材８２の初期位置を、第１実施形態における位置よりも、第１空間９１側にシフトした位置としている。こうしておけば、開弁時の可動コア４２の第１加速度の絶対値が、閉弁時の可動コア４２の第２加速度の絶対値よりも大きい場合に対応できる。開弁時の可動コア４２の第１加速度の絶対値が、閉弁時の可動コア４２の第２加速度の絶対値よりも大きい場合、閉弁時よりも開弁時の方が流路制限部材８２にかかる慣性が大きくなるため、このような第１空間９１側にシフトした位置に流路制限部材８２を配置しておけば、流路制限部材８２は、収納部８１３の内壁に当接し難くなる。その結果、流路制限部材８２や収納部８１３の内壁の摩耗を低減できる。さらに、可動コア４２は加速度運動するが、流路制限部材８２は慣性により移動しないので、収納部８１３の流路断面積を絞り、可動コア４２が固定コア４１に衝突する時やニードル５０の弁体５２が弁座３３に衝突するときの衝撃を低減する効果が得られる。なお、第１加速度は、コイル４０から受ける磁力、２つのスプリング６１、６２の強さ及びインジェクタ２０に供給される燃料の圧力により算出可能である。また、第２加速度は、２つのスプリング６１、６２の強さ及びインジェクタ２０に供給される燃料の圧力により算出可能である。 ・Modification 1:
In the first embodiment, the initial position of the flow path restricting member 82 is set at a position substantially in the center of the storage portion 813, but in Modification 1 shown in FIG. The position is shifted to the first space 91 side from the position in the form. By doing so, it is possible to cope with the case where the absolute value of the first acceleration of the movable core 42 when the valve is opened is larger than the absolute value of the second acceleration of the movable core 42 when the valve is closed. When the absolute value of the first acceleration of the movable core 42 when the valve is open is greater than the absolute value of the second acceleration of the movable core 42 when the valve is closed, the flow path restricting member is greater when the valve is open than when the valve is closed. Since the inertia applied to 82 increases, if the flow path restricting member 82 is arranged at such a position shifted to the first space 91 side, the flow path restricting member 82 is less likely to come into contact with the inner wall of the storage section 813. Become. As a result, wear of the flow path restricting member 82 and the inner wall of the housing portion 813 can be reduced. Furthermore, although the movable core 42 accelerates, the flow path restricting member 82 does not move due to inertia. The effect of reducing the impact when the body 52 collides with the valve seat 33 is obtained. The first acceleration can be calculated from the magnetic force received from the coil 40, the strength of the two springs 61 and 62, and the pressure of the fuel supplied to the injector 20. FIG. Also, the second acceleration can be calculated from the strength of the two springs 61 and 62 and the pressure of the fuel supplied to the injector 20 .

図１３では、開弁時の可動コア４２の第１加速度の絶対値が、閉弁時の可動コア４２の第２加速度の絶対値よりも大きいとしたので、流路制限部材８２を収納部８１３のほぼ中央から第１空間９１側にシフトした位置に配置したが、逆に、閉弁時の可動コア４２の第１加速度の絶対値が、開弁時の可動コア４２の第１加速度の絶対値よりも大きい場合には、流路制限部材８２を収納部８１３のほぼ中央から第２空間９２側にシフトした位置に配置すればよい。 In FIG. 13, the absolute value of the first acceleration of the movable core 42 when the valve is opened is greater than the absolute value of the second acceleration of the movable core 42 when the valve is closed. However, the absolute value of the first acceleration of the movable core 42 when the valve is closed is the absolute value of the first acceleration of the movable core 42 when the valve is opened. If it is larger than the value, the flow path restricting member 82 may be arranged at a position shifted from the approximate center of the housing portion 813 toward the second space 92 side.

なお、加速度の絶対値の大きい側に流路制限部材８２を偏位させておく場合に限らず、第１加速度の絶対値と第２加速度の絶対値とが等しい場合でも、流路制限部材８２を一方に偏って配置しても良く、加速度の絶対値の小さい側に流路制限部材８２を偏位させてもよい。こうすれば、開弁時と閉弁時における燃料の移動の制限を異ならせることができる。例えば、閉弁時の燃料の移動の制限を緩やかなものとし、閉弁速度を開弁速度より速めるようにしてもよい。逆に、開弁速度を閉弁速度より速めるようにしてもよい。流路制限部材８２の初期位置、つまり、弾性体８３、８４の長さや形状は、インジェクタ２０が実現すべき特性に応じて決定すれば良い。 It should be noted that, not only when the flow path restricting member 82 is deviated to the side where the absolute value of acceleration is large, but also when the absolute value of the first acceleration and the absolute value of the second acceleration are equal, the flow path restricting member 82 may be biased to one side, or the flow path restricting member 82 may be deviated to the side where the absolute value of acceleration is smaller. In this way, the restrictions on the movement of fuel when the valve is open and when the valve is closed can be made different. For example, the restriction on the movement of fuel when the valve is closed may be moderated, and the valve closing speed may be made faster than the valve opening speed. Conversely, the valve opening speed may be made faster than the valve closing speed. The initial position of the flow path restricting member 82, that is, the length and shape of the elastic bodies 83 and 84 may be determined according to the characteristics that the injector 20 should achieve.

また、図１３に示す例では、開弁時の可動コア４２の第１加速度の絶対値が、閉弁時の可動コア４２の第２加速度の絶対値よりも大きい場合に、流路制限部材８２を収納部８１３のほぼ中央から第１空間９１側にシフトした位置に配置しているが、流路制限部材８２の配置位置を収納部８１３のほぼ中央として、流路制限部材８２を支持する第１弾性体８３、第２弾性体８４のばね定数を変えても良い。具体的には、開弁時の可動コア４２の第１加速度の絶対値が、閉弁時の可動コア４２の第２加速度の絶対値よりも大きい場合には、第２弾性体８４のばね定数を第１弾性体８３のばね定数よりも大きくしてもよい。逆に、閉弁時の可動コア４２の第２加速度が、開弁時の可動コア４２の第１加速度の大きさよりも大きい場合には、第１弾性体８３のばね定数を第２弾性体８４のばね定数よりも大きくしてもよい。例えば、閉弁時の燃料の移動の制限を緩やかなものとし、閉弁速度を開弁速度より速めるようにしてもよい。逆に、開弁速度を閉弁速度より速めるようにしてもよい。流路制限部材８２の初期位置、つまり、弾性体８３、８４のばね定数は、インジェクタ２０が実現すべき特性に応じて決定すれば良い。 Further, in the example shown in FIG. 13, when the absolute value of the first acceleration of the movable core 42 when the valve is opened is greater than the absolute value of the second acceleration of the movable core 42 when the valve is closed, the flow path restricting member 82 is arranged at a position shifted from approximately the center of the storage portion 813 toward the first space 91 side. The spring constants of the first elastic body 83 and the second elastic body 84 may be changed. Specifically, when the absolute value of the first acceleration of the movable core 42 when the valve is opened is greater than the absolute value of the second acceleration of the movable core 42 when the valve is closed, the spring constant of the second elastic body 84 is may be larger than the spring constant of the first elastic body 83 . Conversely, when the magnitude of the second acceleration of the movable core 42 when the valve is closed is greater than the magnitude of the first acceleration of the movable core 42 when the valve is opened, the spring constant of the first elastic body 83 is set to may be larger than the spring constant of For example, the restriction on the movement of fuel when the valve is closed may be moderated, and the valve closing speed may be made faster than the valve opening speed. Conversely, the valve opening speed may be made faster than the valve closing speed. The initial position of the flow path restricting member 82, that is, the spring constants of the elastic bodies 83 and 84 may be determined according to the characteristics that the injector 20 should achieve.

ばね定数についても、加速度の絶対値が大きい側の弾性体のばね定数を、加速度の絶対値が小さい側の弾性体のばね定数よりも大きくする場合に限られず、加速度が等しい場合でも、一方のばね例数を他方のばね定数より高くしたり、加速度の絶対値が小さい側の弾性体のばね定数を、加速度の絶対値が大きい側の弾性体のばね定数よりも大きくしたりしてもよい。同様に、開弁時と閉弁時における燃料の移動の制限を異ならせることができる。 The spring constant is not limited to the case where the spring constant of the elastic body on the side with the larger absolute value of acceleration is larger than the spring constant of the elastic body on the side with the smaller absolute value of acceleration. The number of springs may be set higher than the other spring constant, or the spring constant of the elastic body on the side with the smaller absolute value of acceleration may be set larger than the spring constant of the elastic body on the side with the larger absolute value of acceleration. . Similarly, the restrictions on fuel movement when the valve is open and when the valve is closed can be different.

・変形例２：
図１４は、可動コア４２が上方に加速度運動するときに、流路制限部材８２が収納部８１３の内壁に接触しない場合を示す説明図である。流路制限部材８２の質量と、可動コア４２の加速度により決まる流路制限部材８２の慣性力をＦｉとし、流路制限部材８２が、収納部８１３の第２空間９２側に着座するときの弾性体８３、８４の弾性力をＦｓとすると、Ｆｉ＜Ｆｓとなるように、弾性体８３、８４のばね定数、長さ、変位量を定めると、可動コア４２が上方に加速度運動しても、流路制限部材８２は、収納部８１３の内壁に接触しない。すなわち、流路８２ｂが閉じることはなく、接触により収納部８１３や流路制限部材８２が摩耗することはない。 ・Modification 2:
FIG. 14 is an explanatory diagram showing a case where the flow path restricting member 82 does not contact the inner wall of the storage portion 813 when the movable core 42 accelerates upward. Let Fi be the inertial force of the flow path restricting member 82 determined by the mass of the flow path restricting member 82 and the acceleration of the movable core 42, and the elasticity when the flow path restricting member 82 is seated on the second space 92 side of the storage portion 813. Assuming that the elastic force of the bodies 83 and 84 is Fs, if the spring constant, length, and amount of displacement of the elastic bodies 83 and 84 are determined so that Fi<Fs, even if the movable core 42 accelerates upward, The flow path restricting member 82 does not contact the inner wall of the storage portion 813 . That is, the flow path 82b is not closed, and the storage portion 813 and the flow path restricting member 82 are not worn out due to contact.

図１５は、可動コア４２が上方に加速度運動するときに、流路制限部材８２が収納部８１３の内壁に接触する場合を示す説明図である。この場合、Ｆｉ＞Ｆｓとなるように、弾性体８３、８４のばね定数、長さ、変位量を定めると、可動コア４２が上方に加速度運動した場合、流路制限部材８２は、収納部８１３の内壁に接触する。流路制限部材８２の質量にはバラツキがあり、弾性体８３、８４に経時劣化が生じる場合がある。このように、流路制限部材８２が収納部８１３の内壁に接触するように、流路制限部材８２の質量、弾性体８３、８４のばね定数、長さ、変位量を定めておくと、弾性体８３、８４の経時劣化や、流路制限部材８２の質量のバラツキが生じても、これらに対するロバスト性を向上することができる。 FIG. 15 is an explanatory diagram showing a case where the flow path restricting member 82 contacts the inner wall of the storage portion 813 when the movable core 42 accelerates upward. In this case, if the spring constant, length, and amount of displacement of the elastic bodies 83 and 84 are determined so that Fi>Fs, when the movable core 42 accelerates upward, the flow path restricting member 82 will move to the storage portion 813 contact the inner wall of The mass of the flow path restricting member 82 varies, and the elastic bodies 83 and 84 may deteriorate over time. If the mass of the flow path limiting member 82 and the spring constants, lengths, and displacements of the elastic bodies 83 and 84 are determined so that the flow path limiting member 82 contacts the inner wall of the housing portion 813, the elastic Even if the bodies 83 and 84 deteriorate over time and the mass of the flow path restricting member 82 varies, robustness against these can be improved.

図１５に示す例では、流路制限部材８２ｃの第２空間９２側に、切り欠き８２ｋ２を備えている。そのため、流路制限部材８２ｃが収納部８１３の第２空間９２側の内壁に接触しても、第１空間９１から第１空間側流路部８１１、収納部８１３、切り欠き８２ｋ２、第２空間側流路部８１２を経て第２空間９２に燃料を流すことができる。その結果、流路制限部材８２ｃを収納部８１３の略中央に戻すことができる。同様に、流路制限部材８２ｃの第１空間９１側に、切り欠き８２ｋ１を備えても良い。切り欠き８２ｋ１は、閉弁時に流路制限部材８２ｃが収納部８１３の第１空間９１側の内壁に接触した場合に、第２空間９２から第１空間９１の燃料を排出する経路を形成する。すなわち、燃料は、第２空間９２から第２空間側流路部８１２、収納部８１３、切り欠き８２ｋ１、第１空間側流路部８１１を経て第１空間９１に排出される。なお、流路制限部材８２ｃは、切り欠き８２ｋ１、８２ｋ２の代わりに、溝を備えても良い。切り欠きや溝は、収納部８１３に形成されていても良い。 In the example shown in FIG. 15, a notch 82k2 is provided on the second space 92 side of the flow path restricting member 82c. Therefore, even if the flow path restricting member 82c contacts the inner wall of the storage portion 813 on the side of the second space 92, the flow path from the first space 91 to the first space side flow path portion 811, the storage portion 813, the notch 82k2, the second space Fuel can flow to the second space 92 through the side channel portion 812 . As a result, the flow path restricting member 82c can be returned to substantially the center of the storage portion 813. As shown in FIG. Similarly, a notch 82k1 may be provided on the first space 91 side of the flow path restricting member 82c. The notch 82k1 forms a path through which the fuel in the first space 91 is discharged from the second space 92 when the flow path restricting member 82c contacts the inner wall of the storage portion 813 on the first space 91 side when the valve is closed. That is, the fuel is discharged from the second space 92 into the first space 91 through the second space-side channel portion 812, the storage portion 813, the notch 82k1, and the first space-side channel portion 811. The flow path restricting member 82c may have grooves instead of the notches 82k1 and 82k2. A notch or groove may be formed in the storage portion 813 .

流路制限部材８２が収納部８１３の第２空間９２側の内壁に接触した場合の第１空間９１と第２空間９２の圧力差により生じる力をＦｐとすると、Ｆｉ＞Ｆｓ＞Ｆｐを満たすように、流路制限部材８２の質量、弾性体８３、８４のばね定数、長さ、変位量を定めると、流路制限部材８２ｃのように切り欠き８２ｋ１、８２ｋ２を設けなくても、流路制限部材８２は、元の位置に戻ることができる。 Assuming that the force generated by the pressure difference between the first space 91 and the second space 92 is Fp when the flow path restricting member 82 contacts the inner wall of the storage portion 813 on the side of the second space 92, Fi>Fs>Fp is satisfied. Furthermore, if the mass of the flow path restricting member 82 and the spring constant, length, and displacement of the elastic bodies 83 and 84 are determined, the flow path restriction can be achieved without providing the notches 82k1 and 82k2 as in the flow path restricting member 82c. Member 82 can return to its original position.

・第２実施形態：
図１６は、第２実施形態における流路制限部材８２ｄを示す説明図である。流路制限部材８２ｄは、第１空間側流路部８１１側の第１受圧部８２ｄ１と、第２空間側流路部８１２側の第２受圧部８２ｄ２と、第１受圧部８２ｄ１と第２受圧部８２ｄ２との間のガイド部８２ｄ３とを備える。流路制限部材８２ｄの相対的な移動方向と垂直な断面の断面積について、第１受圧部８２ｄ１と第２受圧部８２ｄ２における断面積は、ガイド部８２ｄ３における断面積よりも小さい。 ・Second embodiment:
FIG. 16 is an explanatory diagram showing the flow path restricting member 82d in the second embodiment. The flow path restricting member 82d includes a first pressure receiving portion 82d1 on the first space side flow path portion 811 side, a second pressure receiving portion 82d2 on the second space side flow path portion 812 side, the first pressure receiving portion 82d1 and the second pressure receiving portion 82d1. and a guide portion 82d3 between the portion 82d2. Regarding the cross-sectional area of the cross section perpendicular to the relative moving direction of the flow path restricting member 82d, the cross-sectional area of the first pressure receiving portion 82d1 and the second pressure receiving portion 82d2 is smaller than the cross-sectional area of the guide portion 82d3.

第１実施形態で説明したように、慣性力Ｆｉと、弾性体８３、８４の弾性力Ｆｓと、第１空間９１と第２空間９２の圧力差により生じる力Ｆｐとは、Ｆｉ＞Ｆｓ＞Ｆｐを満たすようにすればよい。慣性力Ｆｉを大きく、第１空間９１と第２空間９２の圧力差により生じる力Ｆｐを小さくすれば、弾性体８３、８４の弾性力Ｆｓの範囲を大きくできる。すなわち、弾性体８３、８４のばね定数、長さ、変位量の設計の自由度を大きくできる。 As described in the first embodiment, the inertial force Fi, the elastic force Fs of the elastic bodies 83 and 84, and the force Fp caused by the pressure difference between the first space 91 and the second space 92 satisfy Fi>Fs>Fp. should be satisfied. By increasing the inertia force Fi and decreasing the force Fp generated by the pressure difference between the first space 91 and the second space 92, the range of the elastic force Fs of the elastic bodies 83 and 84 can be increased. That is, the degree of freedom in designing the spring constant, length and amount of displacement of the elastic bodies 83 and 84 can be increased.

慣性力Ｆｉを大きくするには、流路制限部材８２ｄを重くすれば良い。具体的には、流路制限部材８２の体積を大きくすればよい。また、流路制限部材８２ｄを比重の大きな材料で形成すれば良い。例えば、流路制限部材８２ｄを、タングステンで形成すれば、比較的安価なコストで流路制限部材８２ｄを重くでき、慣性力Ｆｉを大きくできる。タングステンよりも比重は少し小さいが、流路制限部材８２ｄをタンタルで形成してもよい。また、タングステンより比重が大きい金属、例えば、金、白金、イリジウム、オスミウムを用いても良い。ここで、流路制限部材８２ｄの外径を大きくすると、受圧面積が大きくなって第１空間９１と第２空間９２の圧力差により生じる力Ｆｐも大きくなってしまう。そこで、本実施形態では、流路制限部材８２ｄの相対的な移動方向と垂直な断面の断面積について、ガイド部８２ｄ３より第１空間９１側の第１受圧部８２ｄ１における断面積とガイド部８２ｄ３より第２空間９２側の第２受圧部８２ｄ２における断面積を、流路制限部材８２ｄの中間のガイド部８２ｄ３における断面積よりも小さくすることで、Ｆｐを小さくしている。これにより、慣性力Ｆｉを大きくすることと、第１空間９１と第２空間９２の圧力差により生じる力Ｆｐを小さくすること、とを両立させることができる。 In order to increase the inertial force Fi, the weight of the flow path restricting member 82d should be increased. Specifically, the volume of the flow path restricting member 82 may be increased. Also, the flow path restricting member 82d may be made of a material having a large specific gravity. For example, if the flow path restricting member 82d is made of tungsten, the flow path restricting member 82d can be made heavy at a relatively low cost, and the inertia force Fi can be increased. The flow path restricting member 82d may be made of tantalum, although its specific gravity is slightly smaller than that of tungsten. Also, metals having a higher specific gravity than tungsten, such as gold, platinum, iridium, and osmium, may be used. Here, if the outer diameter of the flow path restricting member 82d is increased, the pressure receiving area is increased and the force Fp generated by the pressure difference between the first space 91 and the second space 92 is also increased. Therefore, in this embodiment, the cross-sectional area of the cross section perpendicular to the relative moving direction of the flow path restricting member 82d is the cross-sectional area of the first pressure receiving portion 82d1 closer to the first space 91 than the guide portion 82d3 and the cross-sectional area of the guide portion 82d3. Fp is reduced by making the cross-sectional area of the second pressure receiving portion 82d2 on the second space 92 side smaller than the cross-sectional area of the intermediate guide portion 82d3 of the flow path restricting member 82d. Accordingly, it is possible to simultaneously increase the inertial force Fi and decrease the force Fp generated by the pressure difference between the first space 91 and the second space 92 .

・第３実施形態：
図１７は、第３実施形態の衝撃緩和部８０ｃを示す。第３実施形態の衝撃緩和部８０ｃは、第１実施形態の衝撃緩和部８０と比較すると、第１空間９０側の第１弾性体８３を備えておらず、固定コア４１は、第１空間側流路部８１１に侵入可能な突起４１ｃを備えている点が異なる。なお、流路制限部材８２ｅは、閉弁時には、第２弾性体８４に押されて収納部８１３の第１空間側流路部８１１側に接しており、流路８２ａは閉じている。 ・Third embodiment:
FIG. 17 shows the shock absorbing portion 80c of the third embodiment. Compared to the shock absorbing portion 80 of the first embodiment, the shock absorbing portion 80c of the third embodiment does not include the first elastic body 83 on the side of the first space 90, and the fixed core 41 does not include the first elastic body 83 on the side of the first space. The difference is that a projection 41 c that can enter the flow path portion 811 is provided. When the valve is closed, the flow path restricting member 82e is pushed by the second elastic body 84 and is in contact with the first space side flow path section 811 side of the storage section 813, thereby closing the flow path 82a.

図１８は、コイル４４に電力を印加し、可動コア４２をニードル５０の開弁方向に移動させた状態を示す説明図である。この状態でも、流路制限部材８２ｅは、弾性体８４に押されて収納部８１３の第１空間側流路部８１１側に接しており、流路８２ａは閉じている。そのため、第２空間９２の圧力は第１空間９１の圧力よりも低くなるので、第１空間９１と第２空間９２との間に圧力差が生じ、可動コア４２を下方に移動させる力が生じる。その結果、可動コア４２の上昇速度が低く抑えられる。 FIG. 18 is an explanatory diagram showing a state in which electric power is applied to the coil 44 and the movable core 42 is moved in the valve opening direction of the needle 50 . Even in this state, the flow path restricting member 82e is pushed by the elastic body 84 and is in contact with the first space side flow path section 811 side of the storage section 813, and the flow path 82a is closed. Therefore, since the pressure in the second space 92 is lower than the pressure in the first space 91, a pressure difference is generated between the first space 91 and the second space 92, and a force is generated to move the movable core 42 downward. . As a result, the rising speed of the movable core 42 is kept low.

図１９は、可動コア４２が固定コア４１に接触したフルリフト状態を示す。この状態では、流路制限部材８２ｅは、突起４１ｃにより相対的に下方に移動しており、流路８２ａが開いている。そのため、燃料が第２流路１０２から溝４１ｇ、コア内流路８１を経て第２空間９２に流入するので、第２空間９２の圧力は、第１空間９１の圧力とほぼ同じ圧力に戻る。したがって、このように慣性を利用しない構成であっても、可動コア４２に形成され、第１空間９１と第２空間９２とを連通するコア内流路８１であって、可動コア４２が運動しているときは、可動コア４２が運動していないときよりも流路断面積が小さくなるコア内流路８１を構成できる。第３実施形態によれば、可動コア４２の運動は、加速度運動でなくてもよい。 FIG. 19 shows a full lift state in which the movable core 42 is in contact with the fixed core 41. FIG. In this state, the flow path restricting member 82e is moved relatively downward by the projection 41c, and the flow path 82a is opened. Therefore, the fuel flows from the second flow path 102 into the second space 92 via the groove 41g and the in-core flow path 81, so that the pressure in the second space 92 returns to substantially the same pressure as the pressure in the first space 91. Therefore, even with such a configuration that does not use inertia, the core internal flow path 81 that is formed in the movable core 42 and communicates the first space 91 and the second space 92 allows the movable core 42 to move. When the movable core 42 is not moving, the core internal flow path 81 can be configured to have a smaller flow path cross-sectional area than when the movable core 42 is not moving. According to the third embodiment, the motion of the movable core 42 need not be acceleration motion.

・第３実施形態の変形例１：
第３実施形態は、フルリフト状態で流路８２ａを開き、第２空間９２の圧力を、第１空間９１の圧力とほぼ同じ圧力に戻す構成であるが、第２弾性体８４を除き、第１弾性体８３を備え、突起４１ｃの代わりに、第２空間側流路部８１２に侵入可能な突起を備える構成であってもよい。この構成では、閉弁状態で流路８２ｂを開き第２空間９２の圧力を、第１空間９１の圧力とほぼ同じ圧力に戻すことができる。 - Modification 1 of the third embodiment:
The third embodiment has a configuration in which the flow path 82a is opened in the full lift state and the pressure in the second space 92 is returned to substantially the same pressure as the pressure in the first space 91. A configuration may be employed in which the elastic body 83 is provided and a protrusion capable of entering the second space-side channel portion 812 is provided instead of the protrusion 41c. With this configuration, the pressure in the second space 92 can be returned to substantially the same pressure as the pressure in the first space 91 by opening the flow path 82b in the valve closed state.

・第３実施形態の変形例２：
図１７に示す第３実施形態の構成を有するコア内流路８１と、第３実施形態の変形例１の構成を有するコア内流路とを備えることで、フルリフト時に流路８２ａを開き、閉弁時に流路８２ｂを開き、第２空間９２の圧力を、第１空間９１の圧力とほぼ同じ圧力に戻すようにしてもよい。 - Modification 2 of the third embodiment:
By providing the core flow path 81 having the configuration of the third embodiment shown in FIG. The pressure in the second space 92 may be returned to substantially the same pressure as the pressure in the first space 91 by opening the flow path 82b during valve operation.

上記各実施形態では、インジェクタ２０は、気体の燃料を噴射するものとしたが、液体を噴射するインジェクタであってもよい。 In each of the above embodiments, the injector 20 injects gaseous fuel, but may be an injector that injects liquid.

本開示は、上述の実施形態に限られるものではなく、その趣旨を逸脱しない範囲において種々の構成で実現することができる。例えば、実施形態中の技術的特徴は、上述の課題の一部又は全部を解決するために、あるいは、上述の効果の一部又は全部を達成するために、適宜、差し替えや、組み合わせを行うことが可能である。また、その技術的特徴が本明細書中に必須なものとして説明されていなければ、適宜、削除することが可能である。 The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments may be appropriately replaced or combined in order to solve some or all of the above problems or achieve some or all of the above effects. is possible. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

２０…インジェクタ、３０…ハウジング、３１…ノズル部、３２…噴孔、３３…弁座、４１…固定コア、４１ｃ…突起、４１ｇ…溝、４２…可動コア、４２ａ…磁性体可動コア、４２ｂ…非磁性体可動コア、４３…貫通孔、４４…コイル、４５…ヨーク、５０…ニードル、５１…軸部、５２…弁体、５３、５４…ストッパ、６１、６２…第１スプリング、６３…アジャスティングパイプ、７１…フィルタ、７２…バックアップリング、７３…Ｏリング、８０、８０ｃ…衝撃緩和部、８１…コア内流路、８２、８２ｃ、８２ｄ、８２ｅ…流路制限部材、８２ａ…流路、８２ｂ…流路、８３、８４…弾性体、９１…第１空間、９２…第２空間、１０１、１０２、１０３、１０４…流路、１０５…連通路、４２１、５３１、５４１…当接部、８１１…第１空間側流路部、８１２…第２空間側流路部、８１３…収納部、８２ｄ１、８２ｄ２…受圧部、８２ｄ３…ガイド部、ＡＸ…軸 DESCRIPTION OF SYMBOLS 20... Injector 30... Housing 31... Nozzle part 32... Injection hole 33... Valve seat 41... Fixed core 41c... Protrusion 41g... Groove 42... Movable core 42a... Magnetic movable core 42b... Non-magnetic movable core 43 Through hole 44 Coil 45 Yoke 50 Needle 51 Shaft 52 Valve element 53, 54 Stopper 61, 62 First spring 63 Adjuster Sting pipe 71... Filter 72... Backup ring 73... O-ring 80, 80c... Shock absorbing part 81... In-core flow path 82, 82c, 82d, 82e... Flow path restricting member 82a... Flow path, 82b... flow path, 83, 84... elastic body, 91... first space, 92... second space, 101, 102, 103, 104... flow path, 105... communication path, 421, 531, 541... contact portion, 811... First space-side channel portion, 812... Second space-side channel portion, 813... Storage portion, 82d1, 82d2... Pressure receiving portion, 82d3... Guide portion, AX... Shaft

Claims (10)

インジェクタ（２０）であって、
燃料を噴射する噴孔（３２）と内部に前記噴孔に連通する流路（１０１～１０５）が形成された筒状のハウジング（３０）と、
前記噴孔を開閉する弁体（５２）を有するニードル（５０）と、
前記ニードルを移動させる可動コア（４２）と、
前記可動コアを前記ニードルの開弁方向に移動させる磁界を発生させるコイル（４４）と、
前記可動コアの前記噴孔と反対側に設けられ、前記可動コアの移動範囲を規制する固定コア（４１）と、
前記可動コアが上流側に移動する時に圧縮され、下流側に移動する時に拡張される第１空間（９１）と、
前記可動コアが上流側に移動する時に拡張され、下流側に移動する時に圧縮される第２空間（９２）と、
前記可動コアに形成され、前記第１空間と前記第２空間とを連通するコア内流路であって、前記可動コアが運動しているときは、していないときよりも前記コア内流路の流路断面積を小さくする流路制限部材（８２）を内部に有するコア内流路（８１）と、
を備える、
インジェクタ。 an injector (20),
a cylindrical housing (30) in which an injection hole (32) for injecting fuel and flow paths (101 to 105) communicating with the injection hole are formed;
a needle (50) having a valve body (52) for opening and closing the injection hole;
a movable core (42) for moving the needle;
a coil (44) for generating a magnetic field that moves the movable core in the valve opening direction of the needle;
a fixed core (41) provided on the opposite side of the movable core to the injection hole and regulating the movement range of the movable core;
a first space (91) that is compressed when the movable core moves upstream and expands when it moves downstream;
a second space (92) expanded when the movable core moves upstream and compressed when it moves downstream;
an intra-core channel formed in the movable core and communicating between the first space and the second space, wherein the intra-core channel is higher when the movable core is in motion than when the movable core is not in motion; an intra-core channel (81) having therein a channel restricting member (82) for reducing the channel cross-sectional area of
comprising a
injector. 請求項１に記載のインジェクタであって、
前記流路制限部材は、前記可動コアが加速度運動しているときは、していないときよりも前記コア内流路の流路断面積を小さくする、インジェクタ。 The injector of claim 1, comprising:
The injector according to claim 1, wherein the flow path restricting member makes the cross-sectional area of the flow path in the core smaller when the movable core is accelerating than when the movable core is not moving. 請求項１または２に記載のインジェクタであって、
前記流路制限部材は、前記コア内流路内において前記第１空間側と前記第２空間側の少なくとも一方に設けられた弾性体（８３、８４）により支持されており、前記可動コアが運動すると、前記コア内流路内の相対的な位置を変え、前記流路断面積を変える、
インジェクタ。 3. The injector according to claim 1 or 2,
The flow path restricting member is supported by elastic bodies (83, 84) provided on at least one of the first space side and the second space side within the core flow path, and the movable core moves. Then, changing the relative position in the intra-core channel to change the cross-sectional area of the channel,
injector. 請求項３に記載のインジェクタであって、
前記弾性体は、バネまたはゴムである、インジェクタ。 4. The injector of claim 3, wherein
The injector, wherein the elastic body is a spring or rubber. 請求項３または請求項４のいずれか一項に記載のインジェクタであって、
前記弾性体の弾性力は、前記可動コアが運動していない状態で前記流路制限部材が前記コア内流路の内壁と当接しない値とされている、インジェクタ。 5. The injector according to any one of claims 3 or 4,
The injector, wherein the elastic force of the elastic body is set to a value such that the flow path restricting member does not come into contact with the inner wall of the intra-core flow path when the movable core does not move. 請求項３から請求項５のいずれか一項に記載のインジェクタであって、
前記可動コアが運動していない状態で、前記流路制限部材は、前記コア内流路における前記流路制限部材の収納部（８１３）の中間位置よりも、前記第１空間または前記第２空間のいずれか一方に偏った位置に配置されている、
インジェクタ。 The injector according to any one of claims 3 to 5,
In a state in which the movable core is not moving, the flow path restricting member is placed in the first space or the second space relative to the intermediate position of the storage portion (813) of the flow path restricting member in the intra-core flow path. It is placed in a position biased to one of the
injector. 請求項３から請求項５のいずれか一項に記載のインジェクタであって、
前記弾性体として、前記流路制限部材の前記第１空間側に設けられた第１弾性体（８３）と、前記第２空間側に設けられた第２弾性体（８４）とを有し、
前記第１弾性体のばね定数と前記第２弾性体のばね定数と、は異なる値である、
インジェクタ。 The injector according to any one of claims 3 to 5,
As the elastic bodies, a first elastic body (83) provided on the first space side of the flow path restricting member and a second elastic body (84) provided on the second space side,
the spring constant of the first elastic body and the spring constant of the second elastic body are different values;
injector. 請求項３から請求項６のいずれか一項に記載のインジェクタであって、
前記流路制限部材または前記コア内流路の内壁は、前記流路制限部材が前記コア内流路の内壁に接触しても、前記第１空間と前記第２空間との間の流体の移動を可能とする溝または切り欠き（８２ｋ１、８２ｋ２）を有する、
インジェクタ。 The injector according to any one of claims 3 to 6,
The flow path restricting member or the inner wall of the intra-core flow path prevents the fluid from moving between the first space and the second space even if the flow path restricting member contacts the inner wall of the intra-core flow path. having grooves or notches (82k1, 82k2) that allow
injector. 請求項３から請求項８のいずれか一項に記載のインジェクタであって、
前記流路制限部材の相対的な移動方向と垂直な断面の断面積について、前記流路制限部材の中間のガイド部より前記第１空間側の第１受圧部における断面積と、前記ガイド部より前記第２空間側の第２受圧部における断面積は、前記ガイド部における断面積よりも小さい、
インジェクタ。 The injector according to any one of claims 3 to 8,
Regarding the cross-sectional area of the cross section perpendicular to the relative movement direction of the flow path restricting member, A cross-sectional area of the second pressure receiving portion on the second space side is smaller than a cross-sectional area of the guide portion,
injector. 請求項１から請求項９のいずれか一項に記載のインジェクタであって、
前記燃料は気体である、インジェクタ。 The injector according to any one of claims 1 to 9,
The injector, wherein the fuel is gaseous.
JP2019160265A 2019-09-03 2019-09-03 injector Active JP7268546B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196505A (en) 2009-02-23 2010-09-09 Toyota Motor Corp Fuel injection valve
JP2014231810A (en) 2013-05-30 2014-12-11 株式会社日本自動車部品総合研究所 Fuel injection valve
JP2018189002A (en) 2017-04-28 2018-11-29 株式会社Ｓｏｋｅｎ Fuel injection valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019160265A (en) 2018-03-09 2019-09-19 聡子 荻原 Internet banking (personal)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196505A (en) 2009-02-23 2010-09-09 Toyota Motor Corp Fuel injection valve
JP2014231810A (en) 2013-05-30 2014-12-11 株式会社日本自動車部品総合研究所 Fuel injection valve
JP2018189002A (en) 2017-04-28 2018-11-29 株式会社Ｓｏｋｅｎ Fuel injection valve

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