JP4166796B2 - Electromagnetic fuel injection device - Google Patents

Electromagnetic fuel injection device Download PDF

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JP4166796B2
JP4166796B2 JP2006116787A JP2006116787A JP4166796B2 JP 4166796 B2 JP4166796 B2 JP 4166796B2 JP 2006116787 A JP2006116787 A JP 2006116787A JP 2006116787 A JP2006116787 A JP 2006116787A JP 4166796 B2 JP4166796 B2 JP 4166796B2
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core
holder
fuel injection
valve body
injection device
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JP2007285282A (en
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和典 北川
善彦 大西
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Mitsubishi Electric Corp
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Description

この発明は、電磁式燃料噴射装置に関するものである。   The present invention relates to an electromagnetic fuel injection device.

内燃機関における燃焼制御の幅を広げるため燃料噴射弁の流量制御性の向上が要求されており、その制御可能流量の小流量域拡大が求められている。燃料の流量は、燃料噴射弁に送られるパルス信号(開弁時間信号)の長さによって制御できるが、パルス信号の長さが短くなると弁の動きが不安定となり、流量が安定しなくなる。そこで、同じパルス長さで少ない流量を噴射できるようにバルブの応答性の向上が求められる。
磁気回路の電磁力を使って開閉動作させ、内燃機関に燃料を噴射する燃料噴射弁では、コイルの励磁を遮断することで閉弁動作を行っているが、そのコイルの励磁を遮断した際、磁気回路を形成する磁性部材に対し、磁束の流れに垂直な面に渦電流が発生するため磁気回路内に残留磁束が生じる。このためコイルの励磁を遮断後も、その残留磁束により吸引力が発生し閉弁動作に遅れが生じる問題が発生する。この閉弁遅れにより、燃料噴射弁の最小流量特性が悪化する。
バルブの応答性の向上策として、従来から、磁束の流入面に溝を形成することによって電気抵抗を増加させ渦電流の発生を抑制することが提案されている。
例えば特許文献1(実用新案登録第2599460号公報参照)では、コイルが挿貫された固定鉄心の外表面及び内表面の少なくとも一方に、その中心軸方向に沿って溝を構成し、コイルへの給電が遮断されたときに固定鉄心や外側鉄心に発生する渦電流を低減することによりバルブ応答性の改善が図られている。
又、特許文献2(特開2000−18124号公報参照)では、アマチュア外周に複数の溝を構成し、その溝の中にフェライトを埋め込むことで吸引力の低下の抑制及び渦電流の抑制による閉弁遅れの対策が採られバルブ応答性の改善が図られている。
In order to widen the range of combustion control in an internal combustion engine, an improvement in the flow rate controllability of the fuel injection valve is required, and a small flow rate range expansion of the controllable flow rate is required. The flow rate of the fuel can be controlled by the length of the pulse signal (valve opening time signal) sent to the fuel injection valve. However, when the length of the pulse signal becomes shorter, the valve movement becomes unstable and the flow rate becomes unstable. Therefore, an improvement in valve responsiveness is required so that a small flow rate can be injected with the same pulse length.
In the fuel injection valve that opens and closes using the electromagnetic force of the magnetic circuit and injects fuel into the internal combustion engine, the valve closing operation is performed by cutting off the excitation of the coil, but when the excitation of the coil is cut off, For the magnetic member forming the magnetic circuit, an eddy current is generated in a plane perpendicular to the flow of the magnetic flux, so that a residual magnetic flux is generated in the magnetic circuit. For this reason, even after the excitation of the coil is cut off, a problem arises that the attractive force is generated by the residual magnetic flux and the valve closing operation is delayed. Due to this valve closing delay, the minimum flow rate characteristic of the fuel injection valve is deteriorated.
Conventionally, as a measure for improving the responsiveness of the valve, it has been proposed to increase the electric resistance by suppressing the generation of eddy current by forming a groove on the inflow surface of the magnetic flux.
For example, in Patent Document 1 (see Utility Model Registration No. 2599460), a groove is formed along the central axis direction on at least one of the outer surface and the inner surface of the fixed core through which the coil is inserted, The valve responsiveness is improved by reducing eddy currents generated in the fixed iron core and the outer iron core when power feeding is interrupted.
Further, in Patent Document 2 (see Japanese Patent Application Laid-Open No. 2000-18124), a plurality of grooves are formed on the outer periphery of the armature, and ferrite is embedded in the grooves so that the reduction in the attractive force is suppressed and the eddy current is suppressed. Countermeasures for valve delay are taken to improve valve response.

実用新案登録第2599460号公報Utility Model Registration No. 2599460 特開2000−18124号公報JP 2000-18124 A

従来の電磁式燃料噴射装置では、次のような問題点があった。
すなわち、特許文献1では、溝を形成する磁性部材が燃料通路内にあり、燃料通路に面した箇所にあるため、溝の内部を燃料が通過する際に燃料の流れに乱れが生じて流れが不安定となり、燃料噴射弁の流量特性を悪化させる。又、燃料の流れにより溝のエッジが脱落した場合、異物となってバルブに噛み込む問題がある。さらに、吸引面に溝を形成するため、吸引面よりも溝部が最小磁路面積となり、吸引力の不足が生じ、そのため、吸引面積を確保するための大径化が必要となるなどの問題がある。
又、特許文献2では、アマチュア外周に複数の溝を形成しその溝にフェライトを埋め込むことで吸引力低下を抑制しているが、アマチュアが可動鉄心のため、加工時のバリに加えて、作動時常に衝撃がかかり、その衝撃によりフェライトが欠けて脱落する危険性があり、これが脱落した場合は燃料通路内のため燃料噴射弁が破損する。仮に脱落しなくても欠け等が発生してバルブに噛み込むなどの危険性があり、最悪の場合は燃料噴射弁を破損させる可能性がある。
この発明は、上記のような問題点を解消するためになされたもので、内部に燃料通路を有する燃料噴射弁において、燃料通路に面せず、且つ吸引力が低下する等といった問題が生じさせること無く渦電流を低減し、コイルの励磁を遮断した際、速やかに閉弁動作が開始される電磁式燃料噴射弁を提供することにある。
The conventional electromagnetic fuel injection device has the following problems.
That is, in Patent Document 1, since the magnetic member that forms the groove is in the fuel passage and is located at the location facing the fuel passage, the flow of the fuel is disturbed when the fuel passes through the inside of the groove. It becomes unstable and deteriorates the flow rate characteristic of the fuel injection valve. In addition, when the groove edge falls off due to the flow of fuel, there is a problem that it becomes a foreign matter and bites into the valve. Further, since the groove is formed on the attraction surface, the groove portion has a minimum magnetic path area than the attraction surface, resulting in a lack of attraction force. Therefore, there is a problem that it is necessary to increase the diameter to secure the attraction area. is there.
Further, in Patent Document 2, although a plurality of grooves are formed on the outer periphery of the armature and ferrite is embedded in the grooves, a decrease in suction force is suppressed. However, since the armature is a movable iron core, it operates in addition to burrs during processing. There is always a shock, and there is a risk of the ferrite missing due to the shock, and there is a risk of falling off. If this falls, the fuel injection valve is broken because it is in the fuel passage. Even if it does not fall off, there is a risk of chipping or the like and biting into the valve. In the worst case, the fuel injection valve may be damaged.
The present invention has been made to solve the above-described problems. In a fuel injection valve having a fuel passage inside, the fuel injection valve does not face the fuel passage and the suction force is reduced. It is an object of the present invention to provide an electromagnetic fuel injection valve in which an eddy current is reduced without interruption and a valve closing operation is quickly started when the excitation of a coil is interrupted.

この発明に係わる電磁式燃料噴射装置は、ヨーク部を形成するハウジング、固定鉄心部分を形成するコア、このコアとエアギャップを介して対向配置され可動鉄心部分を形成するアマチュア、及び上記ハウジングと結合してヨーク部を形成するホルダによって、上記コアの外周部に巻装されたソレノイドコイルの磁気回路を構成し、上記コアと上記ホルダとを、非磁性部材で形成されたリングで結合することにより、上記コアと上記ホルダとこのホルダで支持された弁本体とで燃料通路を構成し、上記アマチュアと一体に構成され上記弁本体に内装された弁体を、上記弁本体内で上記ソレノイドコイルの電磁力により往復動させ燃料噴射口を開閉する電磁式燃料噴射装置において、
上記ホルダの環状端面内周縁と対面する上記コアの環状端面外周縁に、上記リングを嵌合する環状段差部を設け、且つ上記コアの外周面に、上記コアの環状段差部の段差より浅くした溝を複数設けることにより渦電流の発生を抑制するものである。
An electromagnetic fuel injection device according to the present invention includes a housing that forms a yoke portion, a core that forms a fixed core portion, an armature that is disposed opposite to the core via an air gap and forms a movable core portion, and is coupled to the housing. A magnetic circuit of a solenoid coil wound around the outer periphery of the core is constituted by a holder that forms a yoke portion, and the core and the holder are coupled by a ring formed of a nonmagnetic member. The core, the holder, and the valve body supported by the holder constitute a fuel passage, and the valve body that is integrally formed with the armature and is built in the valve body is connected to the solenoid coil in the valve body. In an electromagnetic fuel injection device that reciprocates by electromagnetic force to open and close the fuel injection port,
An annular step portion for fitting the ring is provided on the outer peripheral edge of the core facing the inner peripheral edge of the annular end surface of the holder, and the outer peripheral surface of the core is shallower than the step of the annular step portion of the core. The generation of eddy current is suppressed by providing a plurality of grooves.

特許文献1に記載の電磁式燃料噴射装置では、溝を形成する磁性部材が燃料通路内にあり、燃料通路に面した箇所にあるため、燃料の流れに乱れが生じて流れが不安定となり、燃料噴射弁の流量特性を悪化させ、又、燃料の流れにより溝のエッジが脱落した場合、異物となってバルブに噛み込む問題があったが、この発明によればこれらの問題点をすべて解消できる。
さらに、吸引面に溝を形成しないので、吸引力の不足が生ぜず吸引面積を確保するための大径化が必要でないなどの効果がある。
又、特許文献2では、アマチュア外周に複数の溝を形成しその溝にフェライトを埋め込むことで吸引力低下を抑制しているが、アマチュアが可動鉄心のため、加工時のバリに加えて、作動時常に衝撃がかかり、その衝撃によりフェライトが欠けて脱落する危険性があり、これが脱落した場合には、燃料通路内のため最悪の場合燃料噴射弁が破損する恐れがあったが、この発明によればこれらの問題点をすべて解消できる。
このように、この発明の電磁式燃料噴射装置によれば、燃料通路に面しない箇所に溝を形成しているため、溝による燃料の乱れが生じることがなく、流量性能と噴霧形状との悪化を避けることができ、燃料通路内に上述したような異物の脱落がないので、信頼性を損なうことがない。
又、最小磁気通路面積を減少させずに溝を設けることができ、渦電流発生の抑制による閉弁遅れの低減により流量特性の向上が図れる(最小流量域の拡大及びダイナミックレンジ拡大)。
In the electromagnetic fuel injection device described in Patent Document 1, since the magnetic member forming the groove is in the fuel passage and is located at the location facing the fuel passage, the fuel flow is disturbed and the flow becomes unstable. When the flow rate characteristics of the fuel injection valve are deteriorated and the groove edge falls off due to the flow of fuel, there is a problem that it becomes a foreign matter and bites into the valve. According to the present invention, all these problems are solved. it can.
Furthermore, since no groove is formed on the suction surface, there is an effect that a suction force does not become insufficient and an increase in diameter for securing a suction area is not necessary.
Further, in Patent Document 2, although a plurality of grooves are formed on the outer periphery of the armature and ferrite is embedded in the grooves, a decrease in suction force is suppressed. However, since the armature is a movable iron core, it operates in addition to burrs during processing. There is a risk that the impact is always applied, and there is a risk that the ferrite will fall out due to the impact, and in this case, the fuel injection valve may be damaged in the worst case because it is in the fuel passage. According to this, all these problems can be solved.
Thus, according to the electromagnetic fuel injection system of the present invention, because it forms a groove in a position not facing the fuel passage, without disturbance of the fuel by the grooves occur, worsening the flow properties and the spray shape Since the foreign matter does not fall out as described above in the fuel passage, the reliability is not impaired.
Further, the groove can be provided without reducing the minimum magnetic passage area, and the flow rate characteristics can be improved by reducing the valve closing delay by suppressing the generation of eddy currents (expansion of the minimum flow range and expansion of the dynamic range).

以下、図面にもとづいて、この発明の各実施の形態を説明する。
なお、各図間において、同一符号は同一あるいは相当部分を示す。
実施の形態1.
図1は、この発明の実施の形態1である電磁式燃料噴射装置を示し、この実施の形態1は、図8に示した従来装置の構成に実施したものである。図1(a)は、電磁式燃料噴射装置全体を示す側断面図、図1(b)は、図1中、H部の拡大断面図、図1(c)は、図1(a)のA−A線を矢印方向に見たコア部分の断面図である。
まず、図8にもとづいて、従来装置の構成と動作を説明する。
図8において、燃料噴射弁1は、ソレノイド装置2と弁装置9とで構成されている。
ソレノイド装置2は、磁気回路のヨーク部でもあるハウジング3と、磁気回路の固定鉄心部分であるコア5と、このコアとエアギャップSを介して対向配置され可動鉄心部分を形成するアマチュア8と、ハウジング3と結合してヨーク部を形成し且つ後述する弁装置9の弁本体13を支持するホルダ4と、ハウジング3に内装されたコイルハウジング6aと、このコイルハウジング6aに納められ且つコア5の外周部側に巻装されて磁気回路を励磁するソレノイドコイル6と、ターミナル7と、非磁性部材で形成された断面L字型リング17と、アマチュア8を弁装置9の方向に付勢する圧縮ばね15と、この圧縮ばね15のスプリング力を調整するロッド16を備えている。
したがって、ソレノイド装置2の磁気回路は、ハウジング3、ホルダ4、コア5、ソレノイドコイル6、ターミナル7、可動鉄心であるアマチュア8で構成されている。
なお、コア5とホルダ4は、互いに対面するコア5の環状端面外周縁とホルダ4の環状端面内周縁に、それぞれ位置決め用の環状段差部4a、5aを同心円状に有し、この両環状段差部4a、5aに断面L字型リング17の水平部と垂直部をそれぞれ嵌合することにより位置決めがなされ、さらに溶接部17a、17bで燃料シールすると共にコア5とホルダ4とを結合している。
このようにコア5とホルダ4間に非磁性部材の断面L字型リング17を介在させることにより,コア5からホルダ4への磁気リークを防止している。又、コア5、ホルダ4、断面L字型リング17の内面と後述する弁本体13などで燃料通路を形成している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding parts.
Embodiment 1 FIG.
FIG. 1 shows an electromagnetic fuel injection apparatus according to Embodiment 1 of the present invention, which is implemented in the configuration of the conventional apparatus shown in FIG. 1A is a side sectional view showing the entire electromagnetic fuel injection device, FIG. 1B is an enlarged sectional view of a portion H in FIG. 1, and FIG. 1C is a sectional view of FIG. It is sectional drawing of the core part which looked at the AA line in the arrow direction.
First, the configuration and operation of the conventional apparatus will be described with reference to FIG.
In FIG. 8, the fuel injection valve 1 is composed of a solenoid device 2 and a valve device 9.
The solenoid device 2 includes a housing 3 that is also a yoke portion of a magnetic circuit, a core 5 that is a fixed core portion of the magnetic circuit, and an armature 8 that is disposed to face the core via an air gap S to form a movable core portion. A holder 4 which is coupled to the housing 3 to form a yoke portion and supports a valve body 13 of a valve device 9 which will be described later, a coil housing 6a housed in the housing 3, a coil housing 6a and a core 5 A solenoid coil 6 wound around the outer peripheral side to excite a magnetic circuit, a terminal 7, a cross-sectional L-shaped ring 17 formed of a nonmagnetic member, and a compression that biases the armature 8 toward the valve device 9. A spring 15 and a rod 16 for adjusting the spring force of the compression spring 15 are provided.
Therefore, the magnetic circuit of the solenoid device 2 includes a housing 3, a holder 4, a core 5, a solenoid coil 6, a terminal 7, and an armature 8 that is a movable iron core.
The core 5 and the holder 4 have annular stepped portions 4a and 5a for positioning concentrically on the outer peripheral edge of the annular end surface of the core 5 and the inner peripheral edge of the annular end surface of the holder 4, respectively. Positioning is performed by fitting the horizontal portion and the vertical portion of the L-shaped ring 17 to the portions 4a and 5a, respectively, and the core 5 and the holder 4 are coupled together while fuel sealing is performed at the weld portions 17a and 17b. .
Thus, the magnetic leakage from the core 5 to the holder 4 is prevented by interposing the L-shaped cross-section 17 of the nonmagnetic member between the core 5 and the holder 4. A fuel passage is formed by the core 5, the holder 4, the inner surface of the L-shaped cross-section ring 17 and the valve body 13 described later.

弁装置9は、ホルダ4の内径部に圧入溶接して固定された弁本体13と、アマチュア8と溶接で一体に構成され、弁本体13に内挿され中心円筒部を貫通する弁体(ニードル)10と、ホルダ4と弁本体13に挟持され、アマチュア8とコア5との間に形成されるエアギャップSの間隔を制約(弁体10のリフト量を規制)するストッパ14と、弁体10に貫通され弁本体13の先端に設けられた軸受け11と、弁体10の先端と離接して燃料の流路を閉開するバブルシート12などを備えている。
弁体10は、アマチュア8と共に圧縮ばね15によりバルブシート12に押圧され、且つ弁体の摺動部10bで弁本体13の内径部13aに案内されソレノイドコイル6の電磁力によりコア5に向って往復動(摺動)可能なように弁本体13に取付られ燃料噴射口21を開閉する。なお、18はスペーサ、19はラバーリング、20は濾過網である。
The valve device 9 is integrally formed by welding with the valve body 13 fixed to the inner diameter portion of the holder 4 by press-fitting and welding, and is inserted into the valve body 13 and penetrates the central cylindrical portion (needle). ) 10, a stopper 14 that is sandwiched between the holder 4 and the valve body 13 and restricts the distance of the air gap S formed between the armature 8 and the core 5 (the lift amount of the valve body 10 is restricted), and the valve body 10 is provided with a bearing 11 penetrating through 10 and provided at the tip of the valve main body 13, a bubble sheet 12 which opens and closes the fuel flow path while being in contact with the tip of the valve body 10.
The valve body 10 is pressed against the valve seat 12 by the compression spring 15 together with the armature 8, and is guided to the inner diameter portion 13 a of the valve body 13 by the sliding portion 10 b of the valve body toward the core 5 by the electromagnetic force of the solenoid coil 6. The fuel injection port 21 is opened and closed by being attached to the valve body 13 so as to be reciprocally movable (slidable). In addition, 18 is a spacer, 19 is a rubber ring, and 20 is a filtration net.

次に動作について説明する。
図示しない制御コントローラの開弁動作信号により燃料噴射弁1のソレノイドコイル6が励磁され、ソレノイド装置2の磁気回路に磁束が発生する。その際、コア5とアマチュア8の対抗面で吸引力が発生し、吸引力が圧縮ばね15のスプリング力以上となった時点でコア5がアマチュア8を吸引動作する。
吸引動作は、弁体10がストッパ14に当接するまで行われる。その時、弁体10とバルブシート12間が開口し燃料が噴射される。
次に、前記制御コントローラの閉弁動作信号によりソレノイド装置2の磁気回路に発生する磁束が消滅する。同時にアマチュア8に発生する吸引力も消滅し、圧縮ばね15のスプリング力により弁体10とバルブシート12間が閉弁する(燃料噴射が停止する)。なお、弁体10の移動量は、それぞれ開弁時はストッパ14、閉弁時はバルブシート12で規制する。
Next, the operation will be described.
A solenoid coil 6 of the fuel injection valve 1 is excited by a valve opening operation signal of a control controller (not shown), and a magnetic flux is generated in the magnetic circuit of the solenoid device 2. At that time, a suction force is generated between the opposing surfaces of the core 5 and the armature 8, and the core 5 sucks the armature 8 when the suction force becomes equal to or greater than the spring force of the compression spring 15.
The suction operation is performed until the valve body 10 comes into contact with the stopper 14. At that time, the valve body 10 and the valve seat 12 are opened, and fuel is injected.
Next, the magnetic flux generated in the magnetic circuit of the solenoid device 2 disappears by the valve closing operation signal of the controller. At the same time, the suction force generated in the armature 8 disappears and the spring force of the compression spring 15 closes the valve body 10 and the valve seat 12 (fuel injection stops). The amount of movement of the valve body 10 is regulated by the stopper 14 when the valve is opened and by the valve seat 12 when the valve is closed.

次に、この発明の実施の形態1を図1〜図2にもとづいて説明する。なお、図8の従来装置と同一又は相当する部分については説明を省略する。
この発明の実施の形態1は、図8のコア5に相当するコア105の外周面(燃料通路の反対側の対面)すなわちソレノイドコイル6と対面する周面に、渦電流の発生を抑制するための溝105aを複数条並列して設けたものである。
そして、この溝105aは、後述するように溝の深さLをコア105の環状段差部5aのコア段差Tより浅く設定している。
この溝105aは、特許文献1、特許文献2に記載の従来装置と同様に渦電流の抑制のために設けられたものであるが、最小磁路面積の確保のため、溝の深さLは、以下に述べるように設定されるものである。
すなわち、図1(b)に示すように、溝の深さL、コア側の環状段差部5aのコア段差をTとしたとき、
T>L
となるよう設定することにより、燃料通路が従来装置と同じ構造のまま、噴霧特性と信頼性を確保した状態で渦電流の抑制が可能であり、結果として閉弁遅れの抑制による流量特性(特に最小流量域の拡大)を向上させることが可能となる。
Next, Embodiment 1 of the present invention will be described with reference to FIGS. Note that a description of the same or corresponding parts as those of the conventional apparatus in FIG. 8 is omitted.
In the first embodiment of the present invention, in order to suppress the generation of eddy currents on the outer peripheral surface of the core 105 corresponding to the core 5 of FIG. 8 (the opposite surface on the opposite side of the fuel passage), that is, the peripheral surface facing the solenoid coil 6. The plurality of grooves 105a are provided in parallel.
The groove 105 a has a groove depth L set shallower than the core step T of the annular step portion 5 a of the core 105 as will be described later.
The groove 105a is provided to suppress eddy currents as in the conventional devices described in Patent Document 1 and Patent Document 2, but in order to secure the minimum magnetic path area, the depth L of the groove is Are set as described below.
That is, as shown in FIG. 1B, when the depth L of the groove and the core step of the annular step portion 5a on the core side are T,
T> L
By setting so that the fuel passage is the same structure as the conventional device, it is possible to suppress the eddy current in a state in which the spray characteristics and the reliability are ensured, and as a result, the flow characteristic (particularly, the valve closing delay is suppressed). (Expansion of the minimum flow rate range) can be improved.

次に、アマチュアに溝を形成したときに生じる応答遅れの影響とこの実施の形態1による効果について図2〜4にもとづいて説明する。
図2(a)は、図1のコア105の一部断面図、図2(b)は、図1のコア105と比較するための従来装置コアの一部断面図、図3は、閉弁時間―渦電流経路(比率)の関係を示すグラフである。
図2において、コア105の外径D、溝数をNとすると、従来装置コア5の渦電流経路長さ及び本実施の形態1のコア105の渦電流経路長さは、

従来装置の渦電流経路長さ=πD
本実施の形態1の渦電流経路長さ=πD+2L*N

となるため、図3のグラフから、従来例の経路長さを1としたとき、この長さを1.5以上(渦電流経路比1.5以上)にすることによって、アマチュアに溝を形成した場合と同等レベルの渦電流抑制効果が得られることが分かる。このことから、

従来装置の渦電流経路長さ*1.5<本実施の形態1の渦電流経路長さ
とすると、
πD*1.5<(πD+2L*N)
L>π*D/4*N
という関係が得られる。

すなわち、この結果によれば、渦電流の経路の長さを従来装置に対し、L>π*D/4*Nとすれば、アマチュアに溝を形成した場合とほぼ同等レベルの渦電流抑制効果が得られると共に、燃料の流れの乱れと信頼性の問題とを解決できる。
又以上のことから、仮にコア段差Tが小さく、溝の深さLが浅くなったとしても溝数Nを増加させることで渦電流の抑制効果を得ることができる。
図4は、弁体の開閉過渡変化を示すグラフで、渦電流低減によりリフトのどの部分を改善したかを示し、残留磁気による閉弁遅れの改善を示している。
Next, the influence of the response delay generated when the groove is formed in the amateur and the effect of the first embodiment will be described with reference to FIGS.
2A is a partial cross-sectional view of the core 105 of FIG. 1, FIG. 2B is a partial cross-sectional view of a conventional apparatus core for comparison with the core 105 of FIG. 1, and FIG. It is a graph which shows the relationship of time-eddy current path (ratio).
In FIG. 2, when the outer diameter D of the core 105 and the number of grooves are N, the eddy current path length of the conventional device core 5 and the eddy current path length of the core 105 of the first embodiment are

Eddy current path length of conventional device = πD
Eddy current path length in the first embodiment = πD + 2L * N

Therefore, from the graph of FIG. 3, when the path length of the conventional example is 1, this length is equal to or greater than 1.5 (eddy current path ratio is equal to or greater than 1.5), which is equivalent to the case where grooves are formed in the amateur. It can be seen that a level of eddy current suppression effect can be obtained. From this,

If the eddy current path length of the conventional device * 1.5 <the eddy current path length of the first embodiment,
πD * 1.5 <(πD + 2L * N)
L> π * D / 4 * N
The relationship is obtained.

That is, according to this result, if the length of the eddy current path is L> π * D / 4 * N with respect to the conventional device, the effect of suppressing the eddy current is almost the same level as when the groove is formed in the amateur. As well as the problem of fuel flow disturbance and reliability.
In addition, from the above, even if the core step T is small and the groove depth L is shallow, the effect of suppressing eddy current can be obtained by increasing the number N of grooves.
FIG. 4 is a graph showing the opening / closing transient change of the valve body, showing which part of the lift is improved by reducing the eddy current, and showing the improvement of the valve closing delay due to the residual magnetism.

次に、実施の形態1では、コア105の外周面に設けた軸方向の溝105aの上端部105pを、ソレノイドコイル6の上端部6pより上方にPだけ長く延長させている。
この結果、ソレノイドコイル6からの磁束がコア側面に流入する際に、磁束がこの溝105aを確実に通過することになるため、より有効な渦電流抑制効果が得られる。
Next, in the first embodiment, the upper end portion 105p of the axial groove 105a provided on the outer peripheral surface of the core 105 is extended longer than the upper end portion 6p of the solenoid coil 6 by P.
As a result, when the magnetic flux from the solenoid coil 6 flows into the core side surface, the magnetic flux surely passes through the groove 105a, so that a more effective eddy current suppressing effect can be obtained.

実施の形態2.
図5は、この発明の実施の形態2の電磁式燃料噴射装置を示し、この実施の形態2は、図8に示した従来装置の構成に実施したものである。図5(a)は、電磁式燃料噴射装置全体を示す側断面図、図5(b)は、図5中、L部の拡大断面図、図5(c)は、図5のB−B線を矢印方向に見たホルダ106の平面図である。なお、図8の従来装置と同一又は相当する部分については説明を省略する。
この発明の実施の形態2は、図1の4に相当するホルダ104の環状端面に、溝104aを、ホルダの中心に対して放射状に複数設けたものである。
この溝104aは、溝の深さGを環状段差部4aのホルダ段差の幅Fより浅く設定している。
このように、F>Gの設定とすることで、溝部が路部にかかることがないので路面積が減少せず、最小磁路面積の減少を防ぐことができ、又燃料通路に面していないため、燃料の流れを乱すことなく渦電流の抑制が可能となる。
Embodiment 2. FIG.
FIG. 5 shows an electromagnetic fuel injection apparatus according to Embodiment 2 of the present invention, which is implemented in the configuration of the conventional apparatus shown in FIG. 5A is a side sectional view showing the entire electromagnetic fuel injection device, FIG. 5B is an enlarged sectional view of the L portion in FIG. 5, and FIG. 5C is a cross-sectional view taken along line BB in FIG. It is the top view of the holder 106 which looked at the line | wire in the arrow direction. Note that a description of the same or corresponding parts as those of the conventional apparatus in FIG. 8 is omitted.
In the second embodiment of the present invention, a plurality of grooves 104a are provided radially on the annular end surface of the holder 104 corresponding to 4 in FIG. 1 with respect to the center of the holder.
In the groove 104a, the depth G of the groove is set to be shallower than the width F of the holder step of the annular step portion 4a.
In this manner, by the setting of the F> G, the groove does not decrease magnetic path area since it is not possible according to the magnetic path portion, can be prevented a reduction in the minimum magnetic path area, also face the fuel passage Therefore, the eddy current can be suppressed without disturbing the fuel flow.

次に、実施の形態2では、溝104aの外方端部104qを、ソレノイドコイル6の端部6qより外方にQだけ長く延長させている。
この結果、ソレノイドコイル6からの磁束がホルダ端面に流入する際に、磁束がこの溝104aを確実に通過することになるため、より有効な渦電流抑制効果が得られる。
Next, in the second embodiment, the outer end 104q of the groove 104a is extended longer than the end 6q of the solenoid coil 6 by Q.
As a result, when the magnetic flux from the solenoid coil 6 flows into the end face of the holder, the magnetic flux surely passes through the groove 104a, so that a more effective eddy current suppressing effect can be obtained.

実施の形態3.
図6は、この発明の実施の形態3の電磁式燃料噴射装置を示し、この実施の形態3は、図8に示した従来装置の構成に実施したものである。図6(a)は、電磁式燃料噴射装置全体を示す側断面図、図6(b)は、図6中のK部の拡大断面図である。なお、図8の従来装置と同一又は相当する部分については説明を省略する。
図6に示された実施の形態3の電磁式燃料噴射装置は、コア205とホルダ204の両方すなわちソレノイドコイル6と対面するコア205の外周面及びホルダ204の環状端面に、複数の溝205a、204aをそれぞれ設けることにより渦電流の発生を抑制するものである。
すなわち、図6において、ホルダ204の環状端面内周縁と対面するコア205の環状端面外周縁に、リング17を嵌合する環状段差部5aを設け、コア205の外周面に、コアの環状段差部5aの段差より浅くした溝205aを複数設けたものである。
又、コア205の環状端面外周縁と対面するホルダ204の環状端面内周縁に、リング17を嵌合する環状段差部4aを設け、ソレノイドコイル6と対面するホルダ204の環状端面に、ホルダの環状段差部4aの段差より浅くした溝204aをホルダ204の中心に対して放射状に複数設けたものである。
このように、コアとホルダのそれぞれで溝深さが十分確保できない場合には、両方に溝を形成しても良い。
Embodiment 3 FIG.
FIG. 6 shows an electromagnetic fuel injection apparatus according to Embodiment 3 of the present invention, which is implemented in the configuration of the conventional apparatus shown in FIG. FIG. 6A is a side sectional view showing the entire electromagnetic fuel injection device, and FIG. 6B is an enlarged sectional view of a portion K in FIG. Note that a description of the same or corresponding parts as those of the conventional apparatus in FIG. 8 is omitted.
The electromagnetic fuel injection device according to the third embodiment shown in FIG. 6 includes a plurality of grooves 205a on both the core 205 and the holder 204, that is, the outer peripheral surface of the core 205 facing the solenoid coil 6 and the annular end surface of the holder 204. By providing each 204a, generation of eddy current is suppressed.
That is, in FIG. 6, an annular stepped portion 5 a for fitting the ring 17 is provided on the outer peripheral edge of the core 205 facing the inner peripheral edge of the annular end surface of the holder 204, and the annular stepped portion of the core is provided on the outer peripheral surface of the core 205. A plurality of grooves 205a shallower than the step 5a are provided.
Further, an annular stepped portion 4a for fitting the ring 17 is provided on the inner peripheral edge of the annular end surface of the holder 204 facing the outer peripheral edge of the annular end surface of the core 205, and the annular shape of the holder is formed on the annular end surface of the holder 204 facing the solenoid coil 6. A plurality of grooves 204 a shallower than the step of the stepped portion 4 a are provided radially with respect to the center of the holder 204.
As described above, when the groove depth cannot be sufficiently secured in each of the core and the holder, grooves may be formed in both of them.

実施の形態4.
図7(a)(b)は、この発明の実施の形態4を示し、図1(c)のコア部分の断面図に相当する断面図とその拡大図である。
図7において、コア305に設けられた溝305aは、溝105a(図1)又は溝104a(図5)に相当し、その溝形状の加工性を向上させるために台形形状にしたもので、この場合も、渦電流の低減効果を同様に得ることができる。
Embodiment 4 FIG.
7 (a) and 7 (b) show a fourth embodiment of the present invention, and are a sectional view corresponding to the sectional view of the core portion of FIG. 1 (c) and an enlarged view thereof.
In FIG. 7, a groove 305a provided in the core 305 corresponds to the groove 105a (FIG. 1) or the groove 104a (FIG. 5), and has a trapezoidal shape in order to improve the workability of the groove shape. Even in this case, the effect of reducing the eddy current can be obtained similarly.

この発明の実施の形態1である電磁式燃料噴射装置の全体構成を示す断面図で、(a)は、電磁式燃料噴射装置全体を示す側断面図、(b)は、図1中、H部の拡大断面図、(c)は、図1のA−A線を矢印方向に見たコア部分の断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole structure of the electromagnetic fuel injection apparatus which is Embodiment 1 of this invention, (a) is a sectional side view which shows the whole electromagnetic fuel injection apparatus, (b) is H in FIG. (C) is sectional drawing of the core part which looked at the AA line of FIG. 1 in the arrow direction. (a)は、図1に示されたコア105の一部断面図、(b)は、図1に示されたコア105と比較するための従来装置コアの一部断面図である。(A) is a partial cross-sectional view of the core 105 shown in FIG. 1, and (b) is a partial cross-sectional view of a conventional apparatus core for comparison with the core 105 shown in FIG. 閉弁時間―渦電流経路(比率)の関係を示すグラフである。It is a graph which shows the relationship of valve closing time-eddy current path (ratio). 弁体の開閉過渡変化を示すグラフである。It is a graph which shows the opening-and-closing transient change of a valve body. この発明の実施の形態2の電磁式燃料噴射装置を示し、(a)は、電磁式燃料噴射装置全体を示す側断面図、(b)は、L部の拡大断面図、(c)は、B−B線を矢印方向に見たホルダ106の平面図である。Embodiment 2 An electromagnetic fuel injection device according to Embodiment 2 of the present invention is shown, (a) is a side sectional view showing the whole electromagnetic fuel injection device, (b) is an enlarged sectional view of an L portion, and (c) is It is the top view of the holder 106 which looked at the BB line in the arrow direction. この発明の実施の形態3の電磁式燃料噴射装置を示し、(a)は、電磁式燃料噴射装置全体を示す側断面図、(b)は、K部の拡大断面図である。FIG. 3 shows an electromagnetic fuel injection device according to Embodiment 3 of the present invention, in which (a) is a side sectional view showing the whole electromagnetic fuel injection device, and (b) is an enlarged sectional view of a K portion. この発明の実施の形態4を示し、(a)は図1(c)のコア部分の断面図に相当する断面図、(b)はその拡大図である。Embodiment 4 of this invention is shown, (a) is sectional drawing equivalent to sectional drawing of the core part of FIG.1 (c), (b) is the enlarged view. 従来の電磁式燃料噴射装置の全体構成を示す側断面図である。It is a sectional side view which shows the whole structure of the conventional electromagnetic fuel injection apparatus.

符号の説明Explanation of symbols

1 燃料噴射弁 2 ソレノイド装置
3 ハウジング 4 ホルダ
4a 環状段差部 5a 環状段差部
105 コア 105a 溝
6 ソレノイドコイル 6a コイルハウジング
7 ターミナル 8 アマチュア
9 弁装置 10 弁体(ニードル)
10b 弁体の摺動部 11 軸受け
12 バブルシート 13 弁本体
13a 内径部 14 ストッパ
15 圧縮ばね 16 ロッド
17 断面L字型リング 17a 溶接部
17b 溶接部
1 Fuel Injection Valve 2 Solenoid Device
3 Housing 4 Holder 4a Annular Step 5a Annular Step 105 Core 105a Groove
6 Solenoid coil 6a Coil housing
7 Terminal 8 Amateur
9 Valve device 10 Valve body (needle)
10b Sliding part of valve body 11 Bearing 12 Bubble sheet 13 Valve body 13a Inner diameter part 14 Stopper 15 Compression spring 16 Rod 17 Cross-section L-shaped ring 17a Welding part 17b Welding part

Claims (3)

ヨーク部を形成するハウジング、固定鉄心部分を形成するコア、このコアとエアギャップを介して対向配置され可動鉄心部分を形成するアマチュア、及び上記ハウジングと結合してヨーク部を形成するホルダによって、上記コアの外周部に巻装されたソレノイドコイルの磁気回路を構成し、上記コアと上記ホルダとを、非磁性部材で形成されたリングで結合することにより、上記コアと上記ホルダとこのホルダで支持された弁本体とで燃料通路を構成し、上記アマチュアと一体に構成され上記弁本体に内装された弁体を、上記弁本体内で上記ソレノイドコイルの電磁力により往復動させ燃料噴射口を開閉する電磁式燃料噴射装置において、
上記ホルダの環状端面内周縁と対面する上記コアの環状端面外周縁に、上記リングを嵌合する環状段差部を設け、且つ上記コアの外周面に、上記コアの環状段差部の段差より浅くした溝を複数設けることにより、渦電流の発生を抑制することを特徴とする電磁式燃料噴射装置。
The housing that forms the yoke portion, the core that forms the fixed core portion, the armature that faces the core through the air gap and forms the movable core portion, and the holder that is combined with the housing to form the yoke portion. The magnetic circuit of the solenoid coil wound around the outer periphery of the core is configured, and the core and the holder are supported by the holder by connecting the core and the holder with a ring formed of a nonmagnetic member. A fuel passage is formed by the valve body, and a valve body that is integrated with the armature and is built in the valve body is reciprocated by the electromagnetic force of the solenoid coil in the valve body to open and close the fuel injection port. In the electromagnetic fuel injection device
An annular step portion for fitting the ring is provided on the outer peripheral edge of the core facing the inner peripheral edge of the annular end surface of the holder, and the outer peripheral surface of the core is shallower than the step of the annular step portion of the core. An electromagnetic fuel injection device characterized in that generation of eddy current is suppressed by providing a plurality of grooves.
ヨーク部を形成するハウジング、固定鉄心部分を形成するコア、このコアとエアギャップを介して対向配置され可動鉄心部分を形成するアマチュア、及び上記ハウジングと結合してヨーク部を形成するホルダによって、上記コアの外周部に巻装されたソレノイドコイルの磁気回路を構成し、上記コアと上記ホルダとを、非磁性部材で形成されたリングで結合することにより、上記コアと上記ホルダとこのホルダで支持された弁本体とで燃料通路を構成し、上記アマチュアと一体に構成され上記弁本体に内装された弁体を、上記弁本体内で上記ソレノイドコイルの電磁力により往復動させ燃料噴射口を開閉する電磁式燃料噴射装置において、
上記コアの環状端面外周縁と対面する上記ホルダの環状端面内周縁に、上記リングを嵌合する環状段差部を設け、且つ上記ソレノイドコイルと対面する上記ホルダの環状端面に、上記ホルダの環状段差部の段差より浅くした溝を上記ホルダの中心に対して放射状に複数設けることにより、渦電流の発生を抑制することを特徴とする電磁式燃料噴射装置。
The housing that forms the yoke portion, the core that forms the fixed core portion, the armature that faces the core through the air gap and forms the movable core portion, and the holder that is combined with the housing to form the yoke portion. The magnetic circuit of the solenoid coil wound around the outer periphery of the core is configured, and the core and the holder are supported by the holder by connecting the core and the holder with a ring formed of a nonmagnetic member. A fuel passage is formed by the valve body, and a valve body that is integrated with the armature and is built in the valve body is reciprocated by the electromagnetic force of the solenoid coil in the valve body to open and close the fuel injection port. In the electromagnetic fuel injection device
An annular stepped portion for fitting the ring is provided on the inner peripheral edge of the holder facing the outer peripheral edge of the annular end surface of the core, and the annular stepped portion of the holder is provided on the annular end surface of the holder facing the solenoid coil. multiple providing it radially with respect to the center of the holder and from the shallow grooves stepped parts, magnet type fuel injection device electrostatic you characterized by inhibiting the generation of eddy currents.
上記コアの外周面に設けた溝の溝数をNとし、上記コアの外径をDとした場合に、この溝の深さLを、L>π*D/4*Nに設定したことを特徴とする請求項1記載の電磁式燃料噴射装置。 When the number of grooves provided on the outer peripheral surface of the core is N and the outer diameter of the core is D, the depth L of the groove is set as L> π * D / 4 * N electromagnetic fuel injection device according to claim 1 Symbol mounting features.
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