JP2005090422A - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
JP2005090422A
JP2005090422A JP2003327215A JP2003327215A JP2005090422A JP 2005090422 A JP2005090422 A JP 2005090422A JP 2003327215 A JP2003327215 A JP 2003327215A JP 2003327215 A JP2003327215 A JP 2003327215A JP 2005090422 A JP2005090422 A JP 2005090422A
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JP
Japan
Prior art keywords
armature
fuel injection
electromagnetic actuator
armature bolt
bolt
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Legal status (The legal status 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 status listed.)
Pending
Application number
JP2003327215A
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Japanese (ja)
Inventor
Kenichi Kubo
賢一 久保
Kinji Takahashi
欣二 高橋
Eiji Hoshikawa
栄二 星川
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Bosch Corp
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Bosch Automotive Systems Corp
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Priority to JP2003327215A priority Critical patent/JP2005090422A/en
Priority to PCT/JP2004/013387 priority patent/WO2005028851A1/en
Publication of JP2005090422A publication Critical patent/JP2005090422A/en
Pending legal-status Critical Current

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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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • F02M63/0022—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures the armature and the valve being allowed to move relatively 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/022—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by acting on fuel control mechanism

Abstract

<P>PROBLEM TO BE SOLVED: To keep lift amount of a valve element constant for a long time even if a component such as an armature plate is worn. <P>SOLUTION: In this fuel injection valve 1 for controlling start and end of fuel injection by controlling a valve mechanism for turning on and off back pressure given to a nozzle needle 32 by an electromagnetic actuator 5, an armature bolt 51 of the electromagnetic actuator 5 is made of a material elongating in the axial direction by change with age. The material of the armature bolt 51 is a material having fixed remaining austenite, for example, a material on which heat treatment is applied and which conforms to SUJ2 or the like. By manufacturing the armature bolt 51 using this kind of raw material and managing tempering temperature after quenching, the armature bolt 51 is elongated in its axial direction by leaving it at normal temperature for a long time to compensate change of lift amount of a ball 52 due to wear of the component. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、内燃機関の気筒内に燃料を噴射供給するための電磁アクチュエータを用いた燃料噴射弁に関する。   The present invention relates to a fuel injection valve using an electromagnetic actuator for injecting and supplying fuel into a cylinder of an internal combustion engine.

コモンレールシステムにおける如く、内燃機関の気筒内へ燃料を直接噴射供給するための燃料噴射弁として、例えば特許文献１に開示されている型式の燃料噴射弁が公知である。この燃料噴射弁は、電磁アクチュエータを通電させることによって噴射弁本体内の制御室を燃料低圧部に連通させ、これによりバルブピストンの背圧を除去してノズルニードルをリフトさせて燃料噴射を開始させ、所定の時間経過後に電磁アクチュエータの通電を停止させて制御室と燃料低圧部との間の連通状態を解除し、バルブピストンに所定の背圧を作用させてノズルニードルを押し下げ、これにより燃料噴射を終了させるように構成されている。   As a fuel injection valve for directly injecting and supplying fuel into a cylinder of an internal combustion engine as in the common rail system, for example, a fuel injection valve of the type disclosed in Patent Document 1 is known. This fuel injection valve causes the control chamber in the injection valve body to communicate with the fuel low pressure portion by energizing the electromagnetic actuator, thereby removing the back pressure of the valve piston and lifting the nozzle needle to start fuel injection. After a predetermined time has elapsed, the electromagnetic actuator is de-energized to release the communication state between the control chamber and the fuel low pressure part, and a predetermined back pressure is applied to the valve piston to depress the nozzle needle, thereby fuel injection Is configured to terminate.

上述の如き構成の燃料噴射弁に用いられている燃料噴射制御用の電磁アクチュエータにあっては、通電のオン、オフに応じて制御室と燃料低圧部との連通状態の制御のための弁体を駆動するアーマチュアプレートのリフト量が一定であることが必要である。これは、アーマチュアプレートのリフト量が変化すると、弁体のリフト量（ストローク量）も変化し、燃料噴射量の変化を生じさせ、内燃機関の性能が変化し、ひいては騒音の増加や排気エミッションの悪化等も生じさせることになるからである。
特開平７−３１０６２１号公報 In the electromagnetic actuator for fuel injection control used in the fuel injection valve having the above-described configuration, the valve body for controlling the communication state between the control chamber and the fuel low-pressure portion in accordance with on / off of energization It is necessary that the lift amount of the armature plate for driving is constant. This is because when the lift amount of the armature plate changes, the lift amount (stroke amount) of the valve body also changes, causing a change in the fuel injection amount, which changes the performance of the internal combustion engine, and consequently increases noise and exhaust emissions. This is because deterioration will occur.
JP-A-7-310621

しかしながら、電磁アクチュエータにより開閉される制御室内の高圧燃料の圧力は極めて高いため、制御室と燃料低圧部との間の連通状態を制御する場合にアーマチュアプレートとアーマチュアストッパとの間に生じる力は大きく、長期間の使用による両部品の摩耗によりアーマチュアプレートのリフト量が大きくなり、この結果、弁体のリフト量も大きくなって電磁アクチュエータが開弁するときに制御室から燃料低圧部へ燃料が逃げやすくなり、燃料噴射量が増大する傾向を生じる。このため、電磁アクチュエータの制御によって予定した燃料の噴射制御を実現することができなくなり、ひいては内燃機関の状態の変化を引き起こすことになる。   However, since the pressure of the high pressure fuel in the control chamber that is opened and closed by the electromagnetic actuator is extremely high, the force generated between the armature plate and the armature stopper is large when controlling the communication state between the control chamber and the fuel low pressure portion. As a result of wear of both parts due to long-term use, the lift amount of the armature plate increases. As a result, the lift amount of the valve body also increases, and when the electromagnetic actuator opens, fuel escapes from the control chamber to the fuel low pressure part. This tends to increase the fuel injection amount. For this reason, it becomes impossible to realize the planned fuel injection control by the control of the electromagnetic actuator, and consequently change the state of the internal combustion engine.

本発明の目的は、従来技術における上述の問題を解決することができるようにした、燃料噴射弁を提供することにある。   An object of the present invention is to provide a fuel injection valve capable of solving the above-described problems in the prior art.

本発明は、アーマチュアプレートに一体または別体に設けられるアーマチュアボルト部材の素材と熱処理温度とを管理することによって、アーマチュアボルト部材を経年変化により伸長させ、これにより部品の摩耗によるアーマチュアプレートのリフト量の変化を補償するようにしたものである。   The present invention controls the material and heat treatment temperature of the armature bolt member provided integrally or separately with the armature plate, thereby extending the armature bolt member with the passage of time, thereby increasing the lift amount of the armature plate due to wear of the parts. It is intended to compensate for the change of.

請求項１の発明によれば、ノズルニードルに与えられる背圧をオン、オフするための弁機構を電磁アクチュエータによって制御して燃料の噴射の開始、終了を制御するようにした燃料噴射弁において、前記電磁アクチュエータのアーマチュアボルト部材が、経時変化により軸方向に伸長する材料から成ることを特徴とする燃料噴射弁が提案される。   According to the invention of claim 1, in the fuel injection valve in which the valve mechanism for turning on and off the back pressure applied to the nozzle needle is controlled by the electromagnetic actuator to control the start and end of fuel injection, A fuel injection valve is proposed in which the armature bolt member of the electromagnetic actuator is made of a material that extends in the axial direction with time.

アーマチュアボルト部材の材料は、一定の残留オーステナイトのある材料、例えば、熱処理を施したＳＵＪ２等に準じる材料を用いることができる。この種の素材を用いてアーマチュアボルト部材を作成し、焼入れしたアーマチュアボルト部材の焼戻し温度の管理によって、常温での長期間放置によりアーマチュアボルト部材をその軸方向に伸びを生じさせるようにすることができる。これは、残留オーステナイトが徐々にマルテンサイトへ変化して膨張し、内部圧力が増大することにより軸方向への寸法の伸びが生じるからである。この軸方向への経年変形の大きさは熱処理温度（焼戻し温度）に依存する。したがって、電磁アクチュエータのアーマチュアプレートその他の部品が使用により摩耗して弁体のリフト量を変化させることになるが、この弁体のリフト量の変化を補償するような軸方向伸長変化が得られるように、アーマチュアボルト部材の熱処理温度（焼戻し温度）を選ぶことが望ましい。これにより、アーマチュアプレートその他の部品の摩耗に拘らず、弁体のリフト量を長期間に亘って一定に保持することが可能となる。   As the material of the armature bolt member, a material having a certain retained austenite, for example, a material conforming to SUJ2 or the like subjected to heat treatment can be used. By creating an armature bolt member using this type of material and managing the tempering temperature of the quenched armature bolt member, the armature bolt member can be stretched in the axial direction when left for a long time at room temperature. it can. This is because the retained austenite gradually changes to martensite and expands, and an increase in internal pressure causes an increase in dimension in the axial direction. The magnitude of this aging deformation in the axial direction depends on the heat treatment temperature (tempering temperature). Therefore, the armature plate and other parts of the electromagnetic actuator are worn by use and change the lift amount of the valve body. However, it is possible to obtain an axial extension change that compensates for the change in the lift amount of the valve body. In addition, it is desirable to select a heat treatment temperature (tempering temperature) of the armature bolt member. This makes it possible to keep the lift amount of the valve body constant over a long period of time regardless of the wear of the armature plate and other parts.

本発明によれば、アーマチュアプレートその他の部品の摩耗に拘らず、弁体のリフト量を長期間に亘って一定に保持することが可能となり、燃料噴射弁を長期間に亘って安定に動作させることができる。   According to the present invention, it becomes possible to keep the lift amount of the valve body constant over a long period of time regardless of the wear of the armature plate and other parts, and to operate the fuel injection valve stably over a long period of time. be able to.

以下、図面を参照して本発明を実施するための最良の形態について詳しく説明する。   The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

図１は、本発明による燃料噴射弁の実施の形態の一例を示す断面図である。符号１で示されるのは、ディーゼル内燃機関に燃料を噴射供給するためのコモンレールシステムに用いられる燃料噴射弁である。燃料噴射弁１は、図示しないディーゼル内燃機関の気筒に組み付けられ、図示しないコモンレールから供給される高圧燃料を気筒内に所要のタイミングで所要の量だけ直接噴射供給するためのものであり、ノズルホルダ２の先端に、ノズル３をリテイニングナット４によって固定して成り、ノズルホルダ２の後端に電磁アクチュエータ５が設けられている。   FIG. 1 is a sectional view showing an example of an embodiment of a fuel injection valve according to the present invention. Reference numeral 1 denotes a fuel injection valve used in a common rail system for injecting and supplying fuel to a diesel internal combustion engine. The fuel injection valve 1 is assembled in a cylinder of a diesel internal combustion engine (not shown), and is for directly injecting and supplying a required amount of high-pressure fuel supplied from a common rail (not shown) into the cylinder at a required timing. The nozzle 3 is fixed to the tip of 2 by a retaining nut 4, and an electromagnetic actuator 5 is provided at the rear end of the nozzle holder 2.

ノズルホルダ２はその軸方向に案内孔２１が形成されている中空体２２を有し、案内孔２１内にはプレッシャーピン２３が案内孔２１によって軸方向に運動可能なように配設されている。中空体２２のばね室２４には弾発ばね２５が収容されており、弾発ばね２５によって後述するノズルニードル３２が噴孔３５の方向に向けて弾発付勢されている。符号２６で示されるのは、図示しないコモンレールからの高圧燃料をノズル３に送給するための中空体２２内に設けられた通路である。   The nozzle holder 2 has a hollow body 22 in which a guide hole 21 is formed in the axial direction, and a pressure pin 23 is disposed in the guide hole 21 so as to be movable in the axial direction by the guide hole 21. . A spring spring 25 is accommodated in the spring chamber 24 of the hollow body 22, and a nozzle needle 32 described later is elastically biased toward the nozzle hole 35 by the spring spring 25. Reference numeral 26 indicates a passage provided in the hollow body 22 for supplying high pressure fuel from a common rail (not shown) to the nozzle 3.

ノズル３はノズルボディー３１とノズルニードル３２とを有し、ノズルボディー３１内に同軸に形成された貫通孔３３によって、ノズルニードル３２がその軸方向に運動可能なように支持、案内されている。ノズルニードル３２の先端部３２Ａは、貫通孔３３と整列してノズルボディー３１内に設けられているシリンダ部３４内に延びており、ノズルニードル３２の先端は噴孔３５を開閉する弁体として働く構成となっている。   The nozzle 3 has a nozzle body 31 and a nozzle needle 32, and the nozzle needle 32 is supported and guided so as to be movable in the axial direction by a through-hole 33 formed coaxially in the nozzle body 31. The tip 32A of the nozzle needle 32 is aligned with the through hole 33 and extends into a cylinder 34 provided in the nozzle body 31, and the tip of the nozzle needle 32 functions as a valve body for opening and closing the nozzle hole 35. It has a configuration.

したがって、ノズルニードル３２が噴孔３５を閉じる位置に保持されている場合には、燃料噴射弁１からは燃料が噴射されない。一方、ノズルニードル３２が後退し、ノズルニードル３２が噴孔３５を開く位置に保持されている場合には、燃料噴射弁１から燃料が噴射される。   Therefore, when the nozzle needle 32 is held at a position where the nozzle hole 35 is closed, fuel is not injected from the fuel injection valve 1. On the other hand, when the nozzle needle 32 is retracted and the nozzle needle 32 is held at a position where the nozzle hole 35 is opened, fuel is injected from the fuel injection valve 1.

ノズルボディー３１内には、通路２６からの高圧燃料が通路３６を介して導入され該高圧燃料を留めておく油だまり３７が形成されている。一方、ノズルニードル３２には油だまり３７内の高圧燃料の圧力によってノズルニードル３２を噴孔３５から離反させる方向に力を作用させるためのテーパ部３８が形成されている。   In the nozzle body 31, an oil sump 37 is formed in which high-pressure fuel from the passage 26 is introduced through the passage 36 and holds the high-pressure fuel. On the other hand, the nozzle needle 32 is formed with a tapered portion 38 for applying a force in a direction in which the nozzle needle 32 is separated from the injection hole 35 by the pressure of the high-pressure fuel in the oil sump 37.

中空体２２の後端部には、案内孔２１と同軸で中空体２２の軸方向に延びているドレーン室４１を下向きに形成しているヘッド４２が形成されている。ヘッド４２には、半径方向の供給伝導路４３及び軸方向のドレーン伝導路４４と連通している制御室４５が形成されている。供給伝導路４３は中空体２２内の半径方向伝導路４６経由で取入具４７と連通しており、制御室４５の底部はプレッシャーピン２３の上部表面で形成されている。   A head 42 is formed at the rear end of the hollow body 22. The head 42 forms a drain chamber 41 that is coaxial with the guide hole 21 and extends in the axial direction of the hollow body 22. The head 42 is formed with a control chamber 45 that communicates with the radial supply conduction path 43 and the axial drain conduction path 44. The supply conduction path 43 communicates with the intake tool 47 via the radial conduction path 46 in the hollow body 22, and the bottom of the control chamber 45 is formed on the upper surface of the pressure pin 23.

電磁アクチュエータ５のアーマチュアボルト５１には、制御室４５と燃料低圧部との間の連通状態を制御する弁機構を構成する弁体として働くボール５２が固定されている。アーマチュアボルト５１は、図示しないバルブスプリングの力によってドレーン伝導路４４に向けて弾発付勢されており、ボール５２がドレーン伝導路４４の開口端に押し付けられドレーン伝導路４４を塞ぐように構成されている。   The armature bolt 51 of the electromagnetic actuator 5 is fixed with a ball 52 that functions as a valve body that constitutes a valve mechanism that controls the communication state between the control chamber 45 and the fuel low pressure portion. The armature bolt 51 is elastically urged toward the drain conduction path 44 by the force of a valve spring (not shown), and the ball 52 is pressed against the open end of the drain conduction path 44 to block the drain conduction path 44. ing.

したがって、電磁アクチュエータ５が通電されていない場合には、ボール５２によってドレーン伝導路４４の開口端が塞がれており、これにより制御室４５は高圧燃料により満たされているので、プレッシャーピン２３によってノズルニードル３２が噴孔３５を閉じており、燃料噴射は行われない。電磁アクチュエータ５が通電されると、ボール５２がドレーン伝導路４４の開口端から離れ、制御室４５内の高圧燃料が燃料低圧部に逃げ、制御室４５内の圧力が降下するので燃料噴射が行われる。電磁アクチュエータ５の通電が切られると、ノズルニードル３２が再び噴孔３５を閉じる位置に戻されるため燃料噴射が終了する。   Therefore, when the electromagnetic actuator 5 is not energized, the open end of the drain conduction path 44 is blocked by the ball 52, so that the control chamber 45 is filled with high-pressure fuel. The nozzle needle 32 closes the nozzle hole 35 and fuel injection is not performed. When the electromagnetic actuator 5 is energized, the ball 52 is separated from the open end of the drain conduction path 44, the high-pressure fuel in the control chamber 45 escapes to the fuel low-pressure part, and the pressure in the control chamber 45 drops, so fuel injection is performed. Is called. When the electromagnetic actuator 5 is de-energized, the nozzle needle 32 is returned to the position where the nozzle hole 35 is closed again, so that fuel injection ends.

図２には電磁アクチュエータ５の要部が断面して詳細に示されている。電磁アクチュエータ５は、ケーシング５３内に、電磁石５４と、アーマチュアプレート５５と、アーマチュアボルト５１とが図示の如く収容されて成っている。電磁石５４は磁極５４Ａにソレノイドコイル５４Ｂを設けた公知の構成のものであり、ソレノイドコイル５４Ｂに励磁電流を供給することによりアーマチュアプレート５５を電磁吸引することができる構成となっている。   FIG. 2 is a detailed sectional view of the main part of the electromagnetic actuator 5. The electromagnetic actuator 5 is configured such that an electromagnet 54, an armature plate 55, and an armature bolt 51 are accommodated in a casing 53 as illustrated. The electromagnet 54 has a known configuration in which the solenoid coil 54B is provided on the magnetic pole 54A, and the armature plate 55 can be electromagnetically attracted by supplying an excitation current to the solenoid coil 54B.

アーマチュアボルト５１は電磁石５４と同軸上に整列して配設されており、ケーシング５３に固定されている支持・案内部材５７によってその軸方向に運動可能なように支持、案内されている。アーマチュアボルト５１の一端側においては、ドレーン伝導路４４を閉ぐためのボール５２がボールホルダ５６を用いて固定されている。ボール５２は弁体として働く部材であり、アーマチュアボルト５１への取り付けは他の適宜の手段によって行うこともできる。   The armature bolt 51 is arranged coaxially with the electromagnet 54 and is supported and guided so as to be movable in the axial direction by a support / guide member 57 fixed to the casing 53. On one end side of the armature bolt 51, a ball 52 for closing the drain conduction path 44 is fixed using a ball holder 56. The ball 52 is a member that functions as a valve body, and can be attached to the armature bolt 51 by other appropriate means.

アーマチュアボルト５１の他端側にはヘッド部が形成されている。このヘッド部は、アーマチュアボルト５１の他端部にプレート部材５１Ａを螺着、溶接、或いは嵌め込み等の適宜の手段でしっかりと取り付けることにより形成されている。なお、アーマチュアボルト５１の他端側にヘッド部を一体形成する構成でもよいことは勿論である。   A head portion is formed on the other end side of the armature bolt 51. The head portion is formed by firmly attaching the plate member 51A to the other end portion of the armature bolt 51 by an appropriate means such as screwing, welding, or fitting. Needless to say, the head portion may be integrally formed on the other end side of the armature bolt 51.

磁極５４Ａの中心部には円筒状の空間５８が形成されており、空間５８内にはばね部材５９とストッパ部材６０とが設けられている。ばね部材５９は、ここでは弾発コイルばねとなっており、弁体であるボール５２を弁閉鎖方向にばね付勢させておくための手段として空間５８の肩部５８Ａとプレート部材５１Ａとの間に設けられている。   A cylindrical space 58 is formed at the center of the magnetic pole 54 </ b> A, and a spring member 59 and a stopper member 60 are provided in the space 58. Here, the spring member 59 is a spring coil spring, and is provided between the shoulder 58A of the space 58 and the plate member 51A as a means for biasing the ball 52, which is a valve body, in the valve closing direction. Is provided.

ストッパ部材６０は空間５８内に嵌め込まれた耐摩耗性の高い金属性のスリーブ状の部材である。ストッパ部材６０は、ボール５２がドレーン伝導路４４を塞ぐ図１の位置状態にあるときに、ストッパ部材６０の下端面６０Ａとプレート部材５１Ａの上端面５１Ａａとの間に所定長さの間隙が生じるように設けられ、これにより、ボール５２のストローク、すなわちアーマチュアボルト５１のストロークがこの所定長さに制限される構成となっている。すなわち、ストッパ部材６０は、ボール５２の最大ストロークを制限するため、プレート部材５１Ａに対向して配置されたストッパ部材となっている。   The stopper member 60 is a metallic sleeve-like member with high wear resistance fitted in the space 58. The stopper member 60 has a gap of a predetermined length between the lower end surface 60A of the stopper member 60 and the upper end surface 51Aa of the plate member 51A when the ball 52 is in the position state of FIG. Thus, the stroke of the ball 52, that is, the stroke of the armature bolt 51 is limited to this predetermined length. In other words, the stopper member 60 is a stopper member disposed to face the plate member 51A in order to limit the maximum stroke of the ball 52.

アーマチュアプレート５５は、プレート部材５１Ａとボール５２との間に位置するようアーマチュアボルト５１に通されており、アーマチュアプレート５５はアーマチュアボルト５１上で軸方向に運動可能となっている。そして、支持・案内部材５７に取り付けられた座金６１とアーマチュアプレート５５との間には弾発コイルばね６２が設けられている。弾発コイルばね６２のばね力はばね部材５９のばね力よりも小さく、アーマチュアプレート５５をプレート部材５１Ａの下端面５１Ａｂに対して圧接させておくために必要なばね力を有するものであり、ばね部材５９の作用を妨げることのない程度の小さなばね力のものである。   The armature plate 55 is passed through the armature bolt 51 so as to be positioned between the plate member 51 </ b> A and the ball 52, and the armature plate 55 can move in the axial direction on the armature bolt 51. An elastic coil spring 62 is provided between the washer 61 attached to the support / guide member 57 and the armature plate 55. The spring force of the elastic coil spring 62 is smaller than the spring force of the spring member 59, and has a spring force necessary for keeping the armature plate 55 in pressure contact with the lower end surface 51Ab of the plate member 51A. The spring force is small enough not to interfere with the action of the member 59.

アーマチュアプレート５５が上述の如く運動するため、アーマチュアボルト５１を介してアーマチュアプレート５５に取り付けられているボール５２もアーマチュアプレート５５の運動に従って運動する。すなわち、ボール５２は、ドレーン伝導路４４を塞ぐ位置から、アーマチュアプレート５５がストッパ部材６０の下端面６０Ａに当接する位置（最大リフト位置）の間を運動する。したがって、アーマチュアプレート５５とストッパ部材６０との当接により摩耗が生じると、ボール５２の最大リフト位置が大きくなるように変化し、一般には燃料噴射量が増大する傾向となる。これは、最大リフト位置が大きくなることにより、弁機構の開閉のためのボール５２の移動距離が大きくなり、ソレノイドコイル５４Ｂへの通電のオン、オフに従って弁機構が完全に開閉するまでの応答時間が長くなるためである。   Since the armature plate 55 moves as described above, the ball 52 attached to the armature plate 55 via the armature bolt 51 also moves according to the movement of the armature plate 55. That is, the ball 52 moves from a position where the drain conduction path 44 is blocked to a position where the armature plate 55 contacts the lower end surface 60 </ b> A of the stopper member 60 (maximum lift position). Therefore, when wear occurs due to the contact between the armature plate 55 and the stopper member 60, the maximum lift position of the ball 52 changes so as to generally increase the fuel injection amount. This is because the movement distance of the ball 52 for opening and closing the valve mechanism increases as the maximum lift position increases, and the response time until the valve mechanism completely opens and closes according to the energization of the solenoid coil 54B. This is because of a longer time.

アーマチュアプレート５５及びストッパ部材６０の摩耗により生じる上述の不具合を改善するため、アーマチュアボルト５１は、常温での長期間放置により、その軸方向に伸長する材料から作られている。すなわち、アーマチュアボルト５１は鋼材を用いて作られているが、残留オーステナイトを有しており、所定の温度で焼入れ処理されている。   In order to improve the above-mentioned problems caused by the wear of the armature plate 55 and the stopper member 60, the armature bolt 51 is made of a material that extends in the axial direction when left for a long period of time at room temperature. That is, the armature bolt 51 is made of steel, but has retained austenite and is hardened at a predetermined temperature.

残留オーステナイトのある鋼材を焼入れ処理すると、焼入れ後、残留オーステナイトが徐々にマルランサイトへ変化して膨張し、アーマチュアボルト５１の内部圧力が増大することによりアーマチュアボルト５１の軸方向への寸法の伸びが生じる。この軸方向への経年変形の大きさは焼入れ後の焼戻し温度に依存している。したがって、電磁アクチュエータ５のアーマチュアプレート５５その他の部品が使用により摩耗して生じるボール５２のリフト量の変化を補償するような軸方向伸長変化が得られるように、アーマチュアボルト５１の焼戻し温度が選ばれており、これにより、アーマチュアプレートその他の部品の摩耗に拘らず、弁体のリフト量を長期間に亘って一定に保持できるようになっている。   When a steel material with residual austenite is quenched, the residual austenite gradually changes to marlansite after quenching and expands, and the internal pressure of the armature bolt 51 increases, so that the axial dimension of the armature bolt 51 increases. Occurs. The magnitude of this aging deformation in the axial direction depends on the tempering temperature after quenching. Accordingly, the tempering temperature of the armature bolt 51 is selected so as to obtain an axial extension change that compensates for a change in the lift amount of the ball 52 caused by wear of the armature plate 55 and other parts of the electromagnetic actuator 5 due to use. Thus, the lift amount of the valve body can be kept constant over a long period of time regardless of the wear of the armature plate and other parts.

上記実施の形態では、アーマチュアプレート５５とアーマチュアボルト５１とを別体とし、アーマチュアボルト５１の他端部にアーマチュアプレート５５をねじ止めする構成の場合について、そのアーマチュアボルト部材であるアーマチュアボルト５１についての焼入れ後の焼戻し温度を管理することにより、アーマチュアボルト５１を経時変化により軸方向に伸縮させるようにした場合を説明した。しかし、本発明は、アーマチュアプレート５５とアーマチュアボルト５１とを別体とし、アーマチュアボルト５１の他端部にアーマチュアプレート５５をねじ止めする構成の場合に限定されるものではなく、アーマチュアプレート５５とアーマチュアボルト５１とが一体に構成されている場合、そのアーマチュアボルト部材についての焼入れ後の焼戻し温度を管理することにより、当該アーマチュアボルト部材を経時変化により軸方向に伸縮させられるようにする構成であってもよい。   In the above embodiment, the armature plate 55 and the armature bolt 51 are separated from each other, and the armature plate 55 is screwed to the other end of the armature bolt 51. The case where the armature bolt 51 is expanded and contracted in the axial direction due to a change with time by managing the tempering temperature after quenching has been described. However, the present invention is not limited to the configuration in which the armature plate 55 and the armature bolt 51 are separately provided and the armature plate 55 is screwed to the other end of the armature bolt 51. The armature plate 55 and the armature are not limited thereto. When the bolt 51 is integrally formed, the armature bolt member can be expanded and contracted in the axial direction due to change over time by managing the tempering temperature after quenching for the armature bolt member. Also good.

本発明による燃料噴射弁の実施の形態の一例を示す断面図。Sectional drawing which shows an example of embodiment of the fuel injection valve by this invention. 図１に示した電磁アクチュエータの断面図。Sectional drawing of the electromagnetic actuator shown in FIG.

符号の説明Explanation of symbols

１ 燃料噴射弁
２ ノズルホルダ
３ ノズル
５ 電磁アクチュエータ
６ マグネットユニット
５１ アーマチュアボルト
５２ ボール
５５ アーマチュアプレート
６０ ストッパ部材 DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Nozzle holder 3 Nozzle 5 Electromagnetic actuator 6 Magnet unit 51 Armature bolt 52 Ball 55 Armature plate 60 Stopper member

Claims (1)

ノズルニードルに与えられる背圧をオン、オフするための弁機構を電磁アクチュエータによって制御して燃料の噴射の開始、終了を制御するようにした燃料噴射弁において、前記電磁アクチュエータのアーマチュアボルト部材が、経時変化により軸方向に伸長する材料から成ることを特徴とする燃料噴射弁。   In the fuel injection valve in which the valve mechanism for turning on and off the back pressure applied to the nozzle needle is controlled by the electromagnetic actuator to control the start and end of fuel injection, the armature bolt member of the electromagnetic actuator includes: A fuel injection valve comprising a material that extends in the axial direction with time.
JP2003327215A 2003-09-19 2003-09-19 Fuel injection valve Pending JP2005090422A (en)

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JP2003327215A JP2005090422A (en) 2003-09-19 2003-09-19 Fuel injection valve
PCT/JP2004/013387 WO2005028851A1 (en) 2003-09-19 2004-09-08 Fuel injection valve

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545431B (en) * 2008-03-27 2012-05-30 株式会社电装 Injector
JP2020060166A (en) * 2018-10-12 2020-04-16 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ Fuel injection control method and fuel injection control device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007047129A1 (en) * 2007-10-02 2009-04-09 Robert Bosch Gmbh Injector with sleeve-shaped control valve element
DE102010061793A1 (en) * 2009-12-29 2011-06-30 Robert Bosch GmbH, 70469 Electromagnetically actuated switching valve, in particular quantity control valve in particular for controlling the delivery rate of a high-pressure fuel pump
CN101818711B (en) * 2010-06-03 2012-02-08 无锡开普动力有限公司 Injection valve of electric control oil injector

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
JPS58193044U (en) * 1982-06-21 1983-12-22 株式会社ボッシュオートモーティブ　システム distribution type fuel injection pump
JP3851122B2 (en) * 2001-07-16 2006-11-29 ボッシュ株式会社 Fuel injection valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545431B (en) * 2008-03-27 2012-05-30 株式会社电装 Injector
JP2020060166A (en) * 2018-10-12 2020-04-16 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ Fuel injection control method and fuel injection control device

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