JPH08291777A - Accumulator fuel injection device - Google Patents
Accumulator fuel injection deviceInfo
- Publication number
- JPH08291777A JPH08291777A JP7130951A JP13095195A JPH08291777A JP H08291777 A JPH08291777 A JP H08291777A JP 7130951 A JP7130951 A JP 7130951A JP 13095195 A JP13095195 A JP 13095195A JP H08291777 A JPH08291777 A JP H08291777A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- fuel
- fuel injection
- pressure
- passage
- Prior art date
- 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.)
- Granted
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- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蓄圧室に貯溜された高
圧燃料を、エンジンの各気筒に設けられた電磁作動の燃
料噴射弁によって燃焼室内に噴射するようにした蓄圧式
燃料噴射装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-accumulation type fuel injection device in which high pressure fuel stored in a pressure accumulation chamber is injected into a combustion chamber by an electromagnetically operated fuel injection valve provided in each cylinder of an engine. It is a thing.
【０００２】[0002]
【従来の技術】従来から、エンジンによって駆動される
高圧燃料供給ポンプにより燃料を加圧して蓄圧室に貯溜
し、同蓄圧室内の高圧燃料をエンジンの各気筒に設けら
れた電磁作動の燃料噴射弁によって燃焼室内に噴射する
ようにした蓄圧式燃料噴射装置は公知である。2. Description of the Related Art Conventionally, a high-pressure fuel supply pump driven by an engine pressurizes fuel to store it in a pressure accumulating chamber, and the high-pressure fuel in the pressure accumulating chamber is provided by an electromagnetically operated fuel injection valve provided in each cylinder of the engine. A pressure accumulating fuel injection device for injecting fuel into a combustion chamber is known.
【０００３】この種の蓄圧式燃料噴射装置では、蓄圧室
内の高圧燃料を各気筒の燃料噴射弁に供給する燃料配管
の破損、同燃料配管の接続部に設けられた管接手の破損
等により燃料の漏洩が発生することがあり、万一漏洩が
発生すると、蓄圧室内に貯溜されている多量の高圧燃料
がすべて流出する不具合がある。上記燃料配管の破損等
に基づく燃料の多量の流出を防止するために、図８の断
面図に示されている構造の安全装置が、既に提案されて
いる。（特開平４−２４１７６７号公開公報参照）In this type of pressure-accumulation fuel injection device, the fuel pipe for supplying the high-pressure fuel in the pressure accumulation chamber to the fuel injection valve of each cylinder is damaged, the pipe joint provided at the connection portion of the fuel pipe is damaged, and the like. There is a possibility that a large amount of high-pressure fuel stored in the accumulator will flow out if the leakage occurs. In order to prevent a large amount of fuel from flowing out due to breakage of the fuel pipe or the like, a safety device having a structure shown in the sectional view of FIG. 8 has already been proposed. (See Japanese Laid-Open Patent Publication No. 4-241767)
【０００４】上記図８において、符号０１は総括的に安
全装置を示し、同安全装置０１は、高圧燃料を貯溜する
蓄圧室０２の外壁に螺合された中空筒状のハウジング０
３を具えている。同ハウジング０３の内部に、大径孔０
４とそれより僅かに小さい直径を有する小径孔０５とが
同軸的に設けられ、大径孔０４と小径孔０５とは円錐部
０６により接続されている。同小径孔０５の開口端に燃
料噴射管０７の上流端が袋ナット０８により緊締され、
同燃料噴射管０７の下流端は、エンジンの各気筒に夫々
設けられている図示しない電磁作動の燃料噴射弁（以下
電磁式燃料噴射弁という）の燃料入口に接続されてい
る。In FIG. 8, reference numeral 01 indicates a safety device as a whole, and the safety device 01 is a hollow cylindrical housing 0 screwed onto the outer wall of a pressure accumulating chamber 02 for storing high-pressure fuel.
It has 3. Inside the housing 03, a large diameter hole 0
4 and a small diameter hole 05 having a diameter slightly smaller than that are coaxially provided, and the large diameter hole 04 and the small diameter hole 05 are connected by a conical portion 06. The upstream end of the fuel injection pipe 07 is tightened with a cap nut 08 at the opening end of the small diameter hole 05,
A downstream end of the fuel injection pipe 07 is connected to a fuel inlet of an electromagnetically operated fuel injection valve (hereinafter referred to as an electromagnetic fuel injection valve) (not shown) provided in each cylinder of the engine.
【０００５】上記大径孔０４内に、摺動自在の遊動ピス
トン０９と、同大径孔０４より小径であるが上記小径孔
０５より大径のボール０１０とが収容されている。また
小径孔０５内にスプリング０１１が挿入され、同スプリ
ング０１１はリテーナ０１２を介して上記ボール０１０
を蓄圧室０２側、即ち上流側に向い弾性的に押圧してい
る。図８は燃料噴射が行なわれていない休止常態を示し
ており、このときボール０１０の中心と、上記円錐部０
６のボール０１０が当接する円径部との間の距離Ｘ内の
孔容積は、上記燃料噴射弁の最大噴射量より十分大きく
形成されている。A slidable floating piston 09 and a ball 010 having a smaller diameter than the large diameter hole 04 but larger than the small diameter hole 05 are accommodated in the large diameter hole 04. Further, a spring 011 is inserted into the small diameter hole 05, and the spring 011 is inserted through the retainer 012 into the ball 010.
Is elastically pressed toward the pressure accumulating chamber 02, that is, toward the upstream side. FIG. 8 shows a resting state in which fuel injection is not performed. At this time, the center of the ball 010 and the conical portion 0
The hole volume within the distance X between the ball 010 of No. 6 and the circular portion with which it abuts is sufficiently larger than the maximum injection amount of the fuel injection valve.
【０００６】エンジンの運転中、各気筒の燃料噴射弁
が、エンジンの運転状態に応じて設定された時間開かれ
ると、ボール０１０より下流側に充満していた燃料が上
記燃料噴射弁から各気筒の燃焼室内に噴射されると共
に、蓄圧室０２内の高圧燃料が燃料入口通路０１３から
大径孔０４内に流入する。このとき遊動ピストン０９及
びボール０１０が一緒に下流側に変位するが、上記距離
Ｘが最大噴射量に相当するボール０１０のストロークよ
り大きく設定されているので、エンジンの通常運転時に
ボール０１０が円錐部０６を閉塞することはない。燃料
噴射弁の噴射が終了すると、スプリング０１１によって
ボール０１０及び遊動ピストン０９が図示の休止位置に
復帰し、このとき大径孔０４内の燃料が遊動ピストン０
９の油孔０１４及びボール０１０の外周を通って同ボー
ルの下流側に流れる。（なお、上記燃料噴射管０７と燃
料噴射弁との間に、燃料噴射の終了時に発生する反射波
が、蓄圧室０２内に伝播されて、各気筒の噴射タイミン
グ、噴射量にばらつきが発生することを防止するための
逆止弁が介装されることがある。）During operation of the engine, when the fuel injection valve of each cylinder is opened for a time set according to the operating condition of the engine, the fuel filled downstream from the ball 010 flows from the fuel injection valve to each cylinder. The high-pressure fuel in the pressure accumulating chamber 02 flows into the large diameter hole 04 from the fuel inlet passage 013 while being injected into the combustion chamber. At this time, the floating piston 09 and the ball 010 are displaced together on the downstream side. However, since the distance X is set to be larger than the stroke of the ball 010 corresponding to the maximum injection amount, the ball 010 is conical during normal operation of the engine. It does not block 06. When the injection of the fuel injection valve is finished, the spring 011 returns the ball 010 and the floating piston 09 to the rest position shown in the drawing, and at this time, the fuel in the large diameter hole 04 is moved to the floating piston 0.
The oil flows through the oil hole 014 and the outer circumference of the ball 010 to the downstream side of the ball. (Note that the reflected wave generated at the end of fuel injection is propagated between the fuel injection pipe 07 and the fuel injection valve into the pressure accumulating chamber 02, and the injection timing and the injection amount of each cylinder vary. A check valve may be installed to prevent this.)
【０００７】上記安全装置０１を具えた燃料噴射装置に
おいて、任意の気筒の燃料噴射管０７が破損したり、管
接手部分例えば袋ナット０８が破損し、或いは燃料噴射
弁が誤作動して、最大噴射量以上の多量の燃料が一時に
流れると、ボール０１０が上記距離Ｘ以上下流側に移動
して円錐部０６に噛みこみ係合して燃料通路を閉塞する
ので、蓄圧室０２からの高圧燃料の流出が防止される。In the fuel injection device equipped with the safety device 01, the fuel injection pipe 07 of an arbitrary cylinder is damaged, the pipe joint part such as the cap nut 08 is damaged, or the fuel injection valve malfunctions, and the maximum When a large amount of fuel equal to or larger than the injection amount flows at a time, the ball 010 moves to the downstream side by the distance X or more and bites into the conical portion 06 to engage and close the fuel passage, so that the high pressure fuel from the pressure accumulating chamber 02 is closed. Is prevented from flowing out.
【０００８】上記従来の安全装置０１は、燃料噴射管０
７の破裂や折損等により急激に多量の燃料が流出する場
合には、一応有効に作動するが、例えば管接手部分の僅
かな隙間等から滲み出すような僅少量の燃料流出はとめ
ることができない。これは、微量の燃料流出によって生
起されるボール０１０の上流側と下流側との間の圧力差
が極めて小さく、スプリング０１１を克服してボール０
１０が円錐部０６側に変位することができないためであ
る。The above-mentioned conventional safety device 01 includes a fuel injection pipe 0
When a large amount of fuel suddenly flows out due to a rupture or breakage of 7, the operation is effective, but a small amount of fuel outflow, such as bleeding from a slight gap in the pipe joint part, cannot be stopped. . This is because the pressure difference between the upstream side and the downstream side of the ball 010 caused by a slight amount of fuel outflow is extremely small, and the spring 011 is overcome to overcome the ball 0.
This is because 10 cannot be displaced toward the conical portion 06 side.
【０００９】たとえ単位時間内の流出量が微量であって
も、時間の累積と共に総流出量は勿論増大し、単に燃料
量の損失を招くだけでなく、エンジン及びその周辺部分
を汚損する不具合があった。Even if the amount of outflow in a unit time is very small, the total amount of outflow increases as time goes by, which not only causes a loss of fuel amount but also causes a problem of polluting the engine and its peripheral parts. there were.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、上記事情に
鑑み創案されたもので、高圧燃料を貯溜している蓄圧室
と各気筒に設けられている電磁式燃料噴射弁とを接続す
る燃料通路を構成する燃料噴射管等の破損に起因する大
量の燃料流出は勿論、燃料通路の僅かなシール欠陥等に
起因する極く微量の燃料漏洩にも確実に応答して、蓄圧
室からの燃料の無駄な流出を防止することができる弁装
置を具えた蓄圧式燃料噴射装置を提供することを主たる
目的とするものである。SUMMARY OF THE INVENTION The present invention was devised in view of the above circumstances, and is a fuel for connecting a pressure accumulating chamber storing high pressure fuel and an electromagnetic fuel injection valve provided in each cylinder. The fuel from the accumulator can be reliably responded to not only a large amount of fuel outflow due to the damage of the fuel injection pipes that constitute the passage but also a very small amount of fuel leakage due to a slight seal defect in the fuel passage. The main object of the present invention is to provide a pressure-accumulation type fuel injection device equipped with a valve device capable of preventing wasteful outflow.
【００１１】本発明の他の目的は、外乱による異常噴射
の確率が少なく安定した作動を達成することができ、ま
た必要に応じエンジンを緊急停止させることができる蓄
圧式燃料噴射装置を提供することである。Another object of the present invention is to provide a pressure-accumulation type fuel injection device which can achieve stable operation with a low probability of abnormal injection due to disturbance and which can emergency stop the engine as required. Is.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、燃料供給ポンプから供給される高圧燃料
を貯溜する蓄圧室、エンジンの各気筒に設けられた電磁
式燃料噴射弁、同燃料噴射弁と上記蓄圧室とを連通する
燃料通路に介装された常閉型の電磁開閉弁、及び上記燃
料噴射弁の開弁時期に略同期して上記電磁開閉弁を開動
させる制御手段を備えたことを特徴とする蓄圧式燃料噴
射装置を提案するものである。To achieve the above object, the present invention provides a pressure accumulating chamber for accumulating high-pressure fuel supplied from a fuel supply pump, an electromagnetic fuel injection valve provided in each cylinder of an engine, and the same. A normally-closed type electromagnetic on-off valve interposed in a fuel passage communicating between the fuel injection valve and the pressure accumulating chamber, and a control means for opening the electromagnetic on-off valve substantially in synchronization with the opening timing of the fuel injection valve. The present invention proposes a pressure-accumulation fuel injection device characterized by being provided.
【００１３】本発明において、上記電磁開閉弁は、上記
制御手段によって、上記燃料噴射弁の燃料噴射開始時点
より僅かに早く開放され、かつ同燃料噴射弁の燃料噴射
終了と同時又は僅かに遅れて閉鎖されるように開閉され
ることが好ましく、また同電磁開閉弁は、それより下流
側の燃料通路の漏洩による圧力降下に応動して、上記制
御手段の作動とは拘わりなく上記蓄圧室内の燃料圧力に
よって自動的に閉鎖されるように構成される。In the present invention, the electromagnetic on-off valve is opened by the control means slightly earlier than the fuel injection start time of the fuel injection valve, and at the same time as or slightly behind the end of fuel injection of the fuel injection valve. It is preferable that the solenoid on-off valve is opened and closed, and the electromagnetic on-off valve responds to a pressure drop due to leakage of a fuel passage on the downstream side of the solenoid on-off valve, so that the fuel inside the pressure accumulating chamber is irrespective of the operation of the control means. It is configured to be closed automatically by pressure.
【００１４】また本発明において、上記電磁開閉弁は、
上記燃料通路の上流端において上記蓄圧室に一体的に配
設されることが好ましく、また上記電磁開閉弁は、上記
蓄圧室に連結された弁ハウジングと、同弁ハウジングの
内部に形成され上記蓄圧室と上記燃料通路とを連通する
弁通路と、同弁通路に介装された弁部材と、上記制御手
段により駆動されて上記弁部材を開閉するソレノイドと
を有することが好ましい。In the present invention, the solenoid opening / closing valve is
It is preferable that the solenoid valve is integrally provided in the pressure accumulating chamber at an upstream end of the fuel passage, and the solenoid opening / closing valve is formed in the valve housing connected to the pressure accumulating chamber and the valve housing. It is preferable to have a valve passage that connects the chamber and the fuel passage, a valve member interposed in the valve passage, and a solenoid that is driven by the control means to open and close the valve member.
【００１５】さらにまた、上記弁部材が、一端に弁シー
トを具え上記ソレノイドによって開位置又は閉位置に選
択的に駆動される第１弁要素と、上記弁シートと協働し
て上記弁通路を開閉する弁体を具えた第２弁要素とから
構成され、上記第１弁要素は、第１の弁スプリングによ
って上記弁シートが上記第２弁要素の弁体に係合する方
向に弾性的に付勢される構成とすることが好ましく、ま
た上記第１弁要素は、その一端に弁シートを具えた中空
筒状のアウタバルブであり、かつ上記第２弁要素は、上
記アウタバルブの中空孔内に摺動自在に嵌装されたガイ
ド脚と上記弁体とを有し、上記アウタバルブに対し同軸
的に配設されたインナバルブであることが望ましい。Still further, the valve member includes a first valve element having a valve seat at one end and selectively driven by the solenoid to an open position or a closed position; and the valve seat in cooperation with the first valve element. And a second valve element having a valve body that opens and closes, wherein the first valve element is elastically elastic in a direction in which the valve seat is engaged with the valve body of the second valve element by a first valve spring. Preferably, the first valve element is a hollow cylindrical outer valve having a valve seat at one end, and the second valve element is in a hollow hole of the outer valve. It is preferable that the inner valve has a guide leg slidably fitted and the valve body, and is arranged coaxially with the outer valve.
【００１６】なおまた、上記アウタバルブは、その外周
面を油密に、かつ摺動自在に上記弁ハウジング内に収容
されて、その中空孔が上記弁通路の一部を形成すると共
に、上記インナバルブが、第２の弁スプリングによって
上記弁体が弁シートから離座する方向に弾性的に付勢さ
れていることが好ましい。さらに、上記インナバルブ
が、上記弁通路の蓄圧室側に配設され、かつ上記アウタ
バルブが同弁通路の下流に接続される上記燃料通路側に
配設され、さらに同アウタバルブに隣接する弁ハウジン
グ内に上記ソレノイドが配置されていることが好まし
い。Further, the outer surface of the outer valve is oil-tightly and slidably housed in the valve housing, the hollow hole thereof forms a part of the valve passage, and the inner valve is It is preferable that the valve body is elastically biased by the second valve spring in a direction of separating from the valve seat. Furthermore, the inner valve is disposed on the pressure chamber side of the valve passage, and the outer valve is disposed on the fuel passage side connected downstream of the valve passage, and in the valve housing adjacent to the outer valve. It is preferable that the solenoid is arranged.
【００１７】[0017]
【作用】本発明によれば、高圧燃料を貯溜している蓄圧
室と、エンジンの各気筒に設けられた電磁式燃料噴射弁
とを接続する燃料通路内に、上記燃料噴射弁と略同期し
て開閉される電磁開閉弁が設けられる。同電磁開閉弁
が、制御手段又はコントロールユニットにより、燃料噴
射弁より僅かに早く開弁され、かつ同噴射弁と同時に又
はそれより僅かに遅れて閉弁されることによって、エン
ジンの運転状態に応じた適切な量の燃料が各気筒の燃焼
室に供給され、通常運転が行なわれる。According to the present invention, in the fuel passage that connects the pressure accumulating chamber for accumulating high-pressure fuel and the electromagnetic fuel injection valve provided in each cylinder of the engine, substantially in synchronization with the fuel injection valve. An electromagnetic on-off valve that is opened and closed is provided. The electromagnetic opening / closing valve is opened slightly earlier than the fuel injection valve by the control means or the control unit, and is closed at the same time as or slightly later than the fuel injection valve, so that the operating state of the engine can be controlled. An appropriate amount of fuel is supplied to the combustion chamber of each cylinder, and normal operation is performed.
【００１８】また、上記電磁開閉弁は、その下流側の燃
料通路に、燃料噴射管の破損等による大量の漏洩が生起
したときは勿論、シールの不完全等により微量の漏洩が
生じた場合でも、上記下流側燃料通路の圧力降下に直接
応答して、制御手段又はコントロールユニットの制御と
は無関係に、蓄圧室内の燃料圧力によって自動的に閉止
され、漏洩による燃料の流出が防止される。また、エン
ジンの各気筒に供給される燃料の噴射タイミング及び噴
射量が、電磁式燃料噴射弁及び電磁開閉弁の協作動によ
り決定されるので、外乱により異状噴射が起る確率が小
さくなり、また必要に応じ、上記電磁開閉弁を閉止する
ことによってエンジンに対する燃料供給を遮断し、緊急
停止させることができる。The solenoid on-off valve is not limited to the case where a large amount of leakage occurs in the fuel passage on the downstream side due to damage of the fuel injection pipe or the like, but also when a small amount of leakage occurs due to imperfect seal or the like. In direct response to the pressure drop in the downstream side fuel passage, the fuel is automatically closed by the fuel pressure in the pressure accumulating chamber irrespective of the control of the control means or the control unit to prevent the fuel from leaking out. Further, since the injection timing and the injection amount of the fuel supplied to each cylinder of the engine are determined by the cooperative operation of the electromagnetic fuel injection valve and the electromagnetic on-off valve, the probability that abnormal injection will occur due to disturbance is reduced, and If necessary, by closing the electromagnetic on-off valve, the fuel supply to the engine can be cut off and an emergency stop can be made.
【００１９】[0019]
【実施例】以下本発明の実施例を、図１ないし図７を参
照して説明する。先ず、本実施例に係る燃料噴射装置を
含む車両用ディーゼルエンジンの概略構成を示す図１に
おいて、符号１０はエンジンを総括的に示し、１２は同
エンジンの各気筒に設けられた電磁式燃料噴射弁であ
る。上記燃料噴射弁１２は、例えば前記特開平４−２４
１７６７号公開公報に開示されているような構造のもの
を、任意に採用することができる。各燃料噴射弁１２
は、コントロールユニット又は制御手段の駆動出力を受
けて作動し、適切な噴射タイミング及び噴射量をもって
各気筒の燃焼室に燃料を噴射する。上記コントロールユ
ニット又は制御手段１４には、エンジンの運転状態を示
す回転数センサ１６の信号出力Ｎｅ、アクセルペダルの
踏込み量を検知する負荷センサ１８の信号出力Ｌｅ、エ
ンジン１０の冷却水温を示す温度センサ２０の信号出力
Ｔｗ、車速を検知する車速センサ２２の信号出力Ｖｈそ
の他必要な信号を受けて、上記燃料噴射量及び噴射タイ
ミングを設定する。Embodiments of the present invention will be described below with reference to FIGS. First, in FIG. 1, which shows a schematic configuration of a vehicle diesel engine including a fuel injection device according to the present embodiment, reference numeral 10 generally indicates the engine, and 12 an electromagnetic fuel injection provided in each cylinder of the engine. It is a valve. The fuel injection valve 12 is, for example, the above-mentioned JP-A-4-24.
A structure as disclosed in Japanese Patent Publication No. 1767 can be arbitrarily adopted. Each fuel injection valve 12
Operates by receiving the drive output of the control unit or the control means, and injects fuel into the combustion chamber of each cylinder at an appropriate injection timing and injection amount. The control unit or the control means 14 indicates the signal output N e of the rotation speed sensor 16 indicating the engine operating condition, the signal output L e of the load sensor 18 detecting the depression amount of the accelerator pedal, and the cooling water temperature of the engine 10. The fuel injection amount and the injection timing are set by receiving the signal output T w of the temperature sensor 20, the signal output V h of the vehicle speed sensor 22 that detects the vehicle speed and other necessary signals.
【００２０】上記燃料噴射弁１２は、夫々燃料通路を形
成する燃料噴射管２４及びその詳細な構造については後
述する電磁開閉弁２６を介して蓄圧室２８に接続されて
いる。同蓄圧室２８は、その内部に可変容量の高圧燃料
供給ポンプ３０により加圧された高圧の燃料を貯溜す
る。同蓄圧室２８には、圧力センサ３２が設けられ、同
圧力センサ３２の燃料圧力信号Ｐｆが上記コントロール
ユニット又は制御手段１４に供給され、同コントロール
ユニット又は制御手段１４は上記燃料圧力信号Ｐｆを受
けて上記燃料供給ポンプ３０に駆動出力を提供し、この
結果、蓄圧室２８内に設定圧力の高圧燃料が貯溜され
る。上記可変容量の燃料供給ポンプ３０に代え、定容量
ポンプを用い、その吐出側に設けられた還流量制御弁の
開度を制御して燃料タンク３４への燃料還流量を制御す
ることによって、蓄圧室２８の燃料圧力を制御すること
もできる。なお、上記燃料タンク３４内に貯溜された燃
料は、低圧のフィードポンプ３６によって上記高圧燃料
供給ポンプ３０に供給される。The fuel injection valve 12 is connected to a pressure accumulating chamber 28 via a fuel injection pipe 24 forming a fuel passage and an electromagnetic opening / closing valve 26, which will be described later in detail. The pressure accumulating chamber 28 stores therein high-pressure fuel pressurized by a variable-capacity high-pressure fuel supply pump 30. A pressure sensor 32 is provided in the pressure accumulating chamber 28, and a fuel pressure signal P f of the pressure sensor 32 is supplied to the control unit or the control means 14, which in turn controls the fuel pressure signal P f. In response to this, a drive output is provided to the fuel supply pump 30, and as a result, high pressure fuel at the set pressure is stored in the pressure accumulating chamber 28. In place of the variable capacity fuel supply pump 30, a constant capacity pump is used, and the opening of a recirculation amount control valve provided on the discharge side is controlled to control the fuel recirculation amount to the fuel tank 34, thereby accumulating pressure. The fuel pressure in chamber 28 can also be controlled. The fuel stored in the fuel tank 34 is supplied to the high-pressure fuel supply pump 30 by a low-pressure feed pump 36.
【００２１】上記電磁開閉弁２６は、図２、図５及び図
６の断面図に良く示されているように、蓄圧室２８の外
壁に螺合されて同蓄圧室に一体的に固着される下方ハウ
ジング３８ａと、同下方ハウジング３８ａに螺合される
上方ハウジング３８ｂとからなる弁ハウジング３８を具
えている。上記下方ハウジング３８ａには、蓄圧室２８
の外壁に設けられた各気筒毎の燃料入口通路２８′に連
通する上流側弁通路又は弁室４０が設けられ、一方、上
方ハウジング３８ｂには、上記弁通路又は弁室４０に連
通する下流側弁通路４２が設けられている。同下流側弁
通路４２の下流端には、図示を省略されている袋ナット
を介して燃料噴射管２４の上流端が接続される。The electromagnetic opening / closing valve 26 is screwed onto the outer wall of the pressure accumulating chamber 28 and integrally fixed to the pressure accumulating chamber 28, as shown in the sectional views of FIGS. 2, 5 and 6. The valve housing 38 includes a lower housing 38a and an upper housing 38b screwed to the lower housing 38a. The accumulator chamber 28 is provided in the lower housing 38a.
An upstream valve passage or valve chamber 40 communicating with the fuel inlet passage 28 'for each cylinder provided on the outer wall of the cylinder is provided, while the upper housing 38b is provided with a downstream side communicating with the valve passage or valve chamber 40. A valve passage 42 is provided. The upstream end of the fuel injection pipe 24 is connected to the downstream end of the downstream valve passage 42 via a cap nut (not shown).
【００２２】また、上記上流側弁通路又は弁室４０は、
下流側の大径部４０ａと燃料入口通路２８′側の小径部
４０ｂとから形成され、大径部４０ａ内には、中空筒状
をなす第１弁要素又はアウタバルブ４４と、第２弁要素
又はインナバルブ４６とからなる弁部材が配設されてい
る。第１弁要素又はアウタバルブ４４は、その外周面を
油密にかつ摺動自在に大径部４０ａに嵌装され、またそ
の中空孔４８の上流側開口端には円錐面からなる弁シー
ト５０が形成されている。一方、第２弁要素又はインナ
バルブ４６は、上記弁シート５０と協働する截頭円錐状
の弁体５２と、上記中空孔４８及び小径部４０ｂ内に夫
々摺動自在に嵌装されるガイド脚５４を具えている。技
術上良く知られているように、上記ガイド脚５４は、弁
軸線に対し直角方向の断面形状が通常十字型又はデルタ
型をなす複数の脚部を具え、各脚部間には広い燃料通路
が形成されている。Further, the upstream side valve passage or valve chamber 40 is
It is formed from a large diameter portion 40a on the downstream side and a small diameter portion 40b on the fuel inlet passage 28 'side. Inside the large diameter portion 40a, a hollow cylindrical first valve element or outer valve 44 and a second valve element or A valve member including the inner valve 46 is provided. The outer peripheral surface of the first valve element or the outer valve 44 is oil-tightly and slidably fitted into the large diameter portion 40a, and a valve seat 50 having a conical surface is provided at the upstream opening end of the hollow hole 48. Has been formed. On the other hand, the second valve element or the inner valve 46 includes a truncated cone-shaped valve body 52 that cooperates with the valve seat 50, and guide legs that are slidably fitted in the hollow hole 48 and the small diameter portion 40b. It has 54. As is well known in the art, the guide leg 54 includes a plurality of legs whose cross-sectional shape in the direction perpendicular to the valve axis is usually cruciform or delta type, and a wide fuel passage is provided between each leg. Are formed.
【００２３】大径部４０ａと小径部４０ｂとの接続部分
における肩部に、図３及び図４に、その詳細な構造を示
したスペーサワッシャ５６が介装されている。同スペー
スワッシャ５６は、円周方向に適宜の間隔を存して突設
された複数の***５８と、***相互間に形成された広い
燃料通路６０とを具えている。A spacer washer 56, the detailed structure of which is shown in FIGS. 3 and 4, is interposed at the shoulder portion at the connecting portion between the large diameter portion 40a and the small diameter portion 40b. The space washer 56 is provided with a plurality of ridges 58 projecting from each other at appropriate intervals in the circumferential direction, and a wide fuel passage 60 formed between the ridges.
【００２４】また、上記上方ハウジング３８ｂの内部に
は、下流側弁通路４２を囲んでソレノイド６２が収蔵さ
れ、同ソレノイド６２は前記コントロールユニット又は
制御手段１４によって付勢され、又は消勢される。上記
アウタバルブ４４と上方ハウジング３８ｂとの間に第１
の弁スプリング６４が縮設され、同スプリング６４によ
ってアウタバルブ４４は常時インナバルブ４６側に向い
弾性的に付勢されている。また、上方ハウジング３８ｂ
とインナバルブ４６との間に第２の弁スプリング６６が
縮設され、同スプリング６６によってインナバルブ４６
は常時スペーサワッシャ５６に向い弾性的に付勢されて
いる。A solenoid 62 is housed inside the upper housing 38b so as to surround the downstream valve passage 42, and the solenoid 62 is energized or deenergized by the control unit or the control means 14. A first member is provided between the outer valve 44 and the upper housing 38b.
The valve spring 64 is contracted, and the outer valve 44 is always elastically biased toward the inner valve 46 by the spring 64. Also, the upper housing 38b
A second valve spring 66 is contracted between the inner valve 46 and the inner valve 46.
Is always elastically biased toward the spacer washer 56.
【００２５】図７は、図１に示した車両用ディーゼルエ
ンジン１０の電磁式燃料噴射弁１２の開閉タイミング
（実線で示す）及び電磁開閉弁２６の開閉タイミング
（点線で示す）を示した線図である。図７において、縦
軸は気筒番号（６気筒の場合が例示されている）であ
り、横軸はクランク角であって、図中の***部Ａ及びＢ
が上記燃料噴射弁１２及び電磁開閉弁２６の開閉期間を
夫々示している。この実施例の場合、電磁開閉弁２６が
燃料噴射弁１２より僅かに早く開き、かつ僅かに遅れて
閉じるように、コントロールユニット又は制御手段１４
により制御されているが、両者を同時に開閉させる即ち
完全に同期して開閉させることもでき、また閉弁のみを
両者同時に行なわせるようにすることもできる。また、
開閉期間Ａ及びＢ及びタイミングは、勿論エンジン１０
の回転数、負荷等運転状態に応じ適切にコントロールユ
ニット又は制御手段１４によって制御される。FIG. 7 is a diagram showing the opening / closing timing (shown by a solid line) of the electromagnetic fuel injection valve 12 and the opening / closing timing (shown by a dotted line) of the electromagnetic opening / closing valve 26 of the vehicle diesel engine 10 shown in FIG. Is. In FIG. 7, the vertical axis represents the cylinder number (the case of 6 cylinders is illustrated), the horizontal axis represents the crank angle, and the ridges A and B in the drawing are shown.
Indicate open / close periods of the fuel injection valve 12 and the electromagnetic open / close valve 26, respectively. In this embodiment, the control unit or the control means 14 is arranged so that the electromagnetic opening / closing valve 26 opens slightly earlier than the fuel injection valve 12 and closes with a slight delay.
However, it is also possible to open and close both at the same time, that is, to open and close in perfect synchronization, or to only close the valves at the same time. Also,
The opening / closing periods A and B and the timing are of course the engine 10
Is controlled by the control unit or the control means 14 in accordance with the operating conditions such as the number of revolutions and the load.
【００２６】図２は、電磁開閉弁２６が閉じている状
態、従って燃料噴射弁１２が燃料噴射を行なっていない
休止状態を示している。このとき、ソレノイド６２は消
勢されていて、第２スプリング６６により第２弁要素又
はインナバルブ４６がスペーサワッシャ５６に対し圧接
されており、また第１スプリング６４により第１弁要素
又はアウタバルブ４４がインナバルブ４６に向い押圧さ
れている。従って、アウタバルブ４４の下端に設けられ
た弁シート５０がインナバルブ４６の弁体５２に圧接さ
れて、上流側弁通路４０は閉塞されている。このとき蓄
圧室２８内の高圧燃料は燃料入口通路２８′から弁通路
４０の小径部４０ｂを経てスペーサワッシャ５６の燃料
通路６０を通りアウタバルブ４４の下端面に達してお
り、一方、アウタバルブ４４の中空孔４８及び下流側弁
通路４２並びに燃料噴射管２４、さらに燃料噴射弁１２
の燃料溜りには、実質的に蓄圧室２８内の燃料と等圧の
燃料が充満している。FIG. 2 shows a state in which the electromagnetic opening / closing valve 26 is closed, that is, a rest state in which the fuel injection valve 12 is not injecting fuel. At this time, the solenoid 62 is deenergized, the second valve element or the inner valve 46 is pressed against the spacer washer 56 by the second spring 66, and the first valve element or the outer valve 44 is pressed by the first spring 64. It is pressed toward 46. Therefore, the valve seat 50 provided at the lower end of the outer valve 44 is pressed against the valve body 52 of the inner valve 46, and the upstream side valve passage 40 is closed. At this time, the high-pressure fuel in the pressure accumulating chamber 28 reaches the lower end surface of the outer valve 44 from the fuel inlet passage 28 ′, the small diameter portion 40 b of the valve passage 40, the fuel passage 60 of the spacer washer 56, and the hollow portion of the outer valve 44. The hole 48, the downstream valve passage 42, the fuel injection pipe 24, and the fuel injection valve 12
The fuel pool is substantially filled with fuel having a pressure equal to that of the fuel in the pressure accumulating chamber 28.
【００２７】次に、図５は、コントロールユニット又は
制御手段１４によりソレノイド６２が付勢された状態を
示している。ソレノイド６２の付勢によりアウタバルブ
４４が第１弁スプリング６４を克服して上方ハウジング
３８ｂに当接するまで上昇し、一方インナバルブ４６は
第２弁スプリング６６によりスペーサワッシャ５６に当
接する下降位置に保持されているので、弁シート５０が
弁体５２から離れ、上流側弁通路４０が開放される。従
って、蓄圧室２８と燃料噴射弁１２とが、電磁開閉弁２
６の上流側弁通路４０、下流側弁通路４２及び燃料噴射
管２４を介して連通され、上記のように燃料噴射弁１２
が開かれることによって、エンジン１０の各気筒に所要
のタイミングで所要量の燃料が噴射されることとなる。Next, FIG. 5 shows a state in which the solenoid 62 is energized by the control unit or the control means 14. The outer valve 44 is raised by the bias of the solenoid 62 until it overcomes the first valve spring 64 and contacts the upper housing 38b, while the inner valve 46 is held by the second valve spring 66 in the lowered position where it contacts the spacer washer 56. Therefore, the valve seat 50 separates from the valve body 52, and the upstream valve passage 40 is opened. Therefore, the pressure accumulation chamber 28 and the fuel injection valve 12 are connected to each other by the electromagnetic opening / closing valve 2.
6, the upstream side valve passage 40, the downstream side valve passage 42, and the fuel injection pipe 24 are communicated with each other.
Is opened, a required amount of fuel is injected into each cylinder of the engine 10 at a required timing.
【００２８】図６は、電磁開閉弁２６から燃料噴射弁１
２との間の燃料通路の任意部分、例えば燃料噴射管２４
と電磁開閉弁２６との接続部分にシール不完全のため漏
洩が生じており、かつエンジン１０が運転を休止してい
る状態を示している。エンジン１０が休止しているの
で、燃料噴射弁１２は勿論作動せず、またソレノイド６
２も消勢しているが、電磁開閉弁２６より下流の燃料通
路からたとえ微量でも燃料が漏洩すると、第１弁要素又
はアウタバルブ４４より下流側の燃料圧力が低下し、蓄
圧室２８内の燃料圧力との間に十分な差圧が発生する。
上記圧力低下は、電磁開閉弁２６が常閉の弁であって、
ソレノイド６２が消勢しているときは、前記のようにア
ウタバルブ４４の弁シート５０とインナバルブ４６の弁
体５２とが常時当接し、かつアウタバルブ４４がその外
周面を油密に上流側弁通路４０の大径部４０ａに嵌装さ
れているので、漏洩した燃料が蓄圧室２８から補給され
ないことに基づくものである。FIG. 6 shows the solenoid valve 26 to the fuel injection valve 1
2, any portion of the fuel passage between the two, such as the fuel injection pipe 24
Shows a state in which leakage occurs due to an imperfect seal at the connecting portion between the electromagnetic on-off valve 26 and the electromagnetic on-off valve 26, and the engine 10 is stopped. Since the engine 10 is stopped, the fuel injection valve 12 does not operate, and the solenoid 6
2 is also deenergized, but even if a small amount of fuel leaks from the fuel passage downstream of the electromagnetic opening / closing valve 26, the fuel pressure downstream of the first valve element or the outer valve 44 decreases, and the fuel inside the pressure accumulating chamber 28 decreases. A sufficient pressure difference is generated between the pressure and the pressure.
The pressure drop is due to the solenoid on-off valve 26 being a normally closed valve,
When the solenoid 62 is deenergized, as described above, the valve seat 50 of the outer valve 44 and the valve body 52 of the inner valve 46 are constantly in contact with each other, and the outer valve 44 oil-tightly seals the outer peripheral surface of the upstream valve passage 40. It is based on the fact that the leaked fuel is not replenished from the pressure accumulating chamber 28 because it is fitted in the large diameter portion 40a of the above.
【００２９】上記漏洩により差圧が発生すると、アウタ
バルブ４４とインナバルブ４６とが、図示のように密着
したまま第１弁スプリング６４を圧縮して下流側に変位
し、アウタバルブ４４が上方弁ハウジング３８ｂに当接
して停止する。従って、燃料通路の漏洩が微量の場合、
電磁開閉弁２６により下流の燃料通路内の圧力が大気圧
まで下降すると漏洩は自然に止まる。また燃料噴射管２
４の破断のような大量漏洩の可能性がある最悪の場合で
も、電磁開閉弁２６は上記と同様に作動して同弁より下
流の燃料通路内の燃料が流出するだけであり、蓄圧室２
８からの大量の燃料の流出は起らず、何れにしても燃料
の流出量は極く少量に抑止されることとなる。この結
果、単位時間内の燃料漏洩量の多寡を問わず、特に従来
は対応が極めて困難、もしくは不可能であった微量の燃
料漏洩を確実に防止することができるので、直接的な燃
料の流出による損失は勿論、流出燃料によるエンジン及
びその周辺の汚損、火災の発生等を有効に防止し得る利
点がある。When a differential pressure is generated due to the above-mentioned leakage, the outer valve 44 and the inner valve 46 are displaced in the downstream side by compressing the first valve spring 64 with the outer valve 44 and the inner valve 46 being in close contact with each other as shown in the drawing, and the outer valve 44 is moved to the upper valve housing 38b. Abut and stop. Therefore, if there is a slight leak in the fuel passage,
When the pressure in the downstream fuel passage decreases to the atmospheric pressure by the electromagnetic opening / closing valve 26, the leakage naturally stops. In addition, the fuel injection pipe 2
Even in the worst case where a large amount of leakage such as breakage of No. 4 may occur, the electromagnetic opening / closing valve 26 operates in the same manner as described above and only the fuel in the fuel passage downstream from the valve opens.
A large amount of fuel does not flow out from the fuel cell 8, and in any case, the amount of fuel outflow is suppressed to a very small amount. As a result, regardless of the amount of fuel leakage per unit time, it is possible to reliably prevent a small amount of fuel leakage, which was extremely difficult or impossible to deal with in the past, so it is possible to prevent direct fuel leakage. As a matter of course, there is an advantage that it is possible to effectively prevent the engine and its surroundings from being contaminated due to the outflow fuel, the occurrence of a fire and the like.
【００３０】また、上記燃料噴射装置では、エンジン１
０に対する燃料噴射が、電磁式燃料噴射弁１２及び電磁
開閉弁２６の協作動によって行なわれるので、外乱によ
る異常噴射の確率が小さく、安定したエンジン１０の運
転が確保される利点があり、さらに、必要に応じ、電磁
開閉弁２６を閉止させることによりエンジン１０を緊急
停止させることができる利点がある。Further, in the above fuel injection device, the engine 1
Since the fuel injection for 0 is performed by the cooperative operation of the electromagnetic fuel injection valve 12 and the electromagnetic on-off valve 26, there is an advantage that the probability of abnormal injection due to disturbance is small and the stable operation of the engine 10 is secured. There is an advantage that the engine 10 can be brought to an emergency stop by closing the electromagnetic opening / closing valve 26 as necessary.
【００３１】なお、上記実施例では、電磁開閉弁２６が
蓄圧室２８に直接取付けられ、換言すれば蓄圧室２８が
電磁開閉弁２６の支持部材として利用されているが、同
電磁開閉弁２６を、蓄圧室２８と燃料噴射弁１２とを接
続する燃料通路の途中に介装し得ることは明らかであ
る。また、電磁開閉弁２６も、図示の構造に限定される
ものではなく、本発明の請求範囲内で種々の変更、改変
を加え実施し得ることは、明らかである。In the above embodiment, the electromagnetic on-off valve 26 is directly attached to the pressure accumulating chamber 28, in other words, the pressure accumulating chamber 28 is used as a supporting member for the electromagnetic on-off valve 26. It is obvious that the pressure accumulating chamber 28 and the fuel injection valve 12 can be interposed in the middle of the fuel passage. Further, it is obvious that the electromagnetic opening / closing valve 26 is not limited to the structure shown in the drawings and can be implemented by making various changes and modifications within the scope of the claims of the present invention.
【００３２】叙上のように、本発明に係る蓄圧式燃料噴
射装置は、燃料供給ポンプから供給される高圧燃料を貯
溜する蓄圧室、エンジンの各気筒に設けられた電磁式燃
料噴射弁、同燃料噴射弁と上記蓄圧室とを連通する燃料
通路に介装された常閉型の電磁開閉弁、及び上記燃料噴
射弁の開弁時期に略同期して上記電磁開閉弁を開動させ
る制御手段を備えたことを特徴とし、上記蓄圧室から燃
料噴射弁にいたる燃料通路からの燃料の漏洩を、たとえ
微量な漏洩であっても確実に防止することができるの
で、燃料の損失、エンジン及びその周辺の汚損等を効果
的に防止し得る利点があり、また異常な燃料噴射が発生
する確率を低減し、さらに必要に応じ、上記電磁開閉弁
を閉止させることによってエンジンの緊急停止を行なう
ことができる等の効果がある。As described above, the pressure-accumulation fuel injection system according to the present invention stores the high-pressure fuel supplied from the fuel supply pump, the pressure-accumulation chamber, the electromagnetic fuel injection valve provided in each cylinder of the engine, A normally-closed type electromagnetic on-off valve interposed in a fuel passage communicating between the fuel injection valve and the pressure accumulating chamber, and a control means for opening the electromagnetic on-off valve substantially in synchronization with the opening timing of the fuel injection valve. Since it is possible to reliably prevent the leakage of fuel from the fuel passage from the pressure accumulating chamber to the fuel injection valve, even if it is a small amount of leakage, there is a loss of fuel, an engine and its surroundings. Of the engine can be effectively prevented, the probability of abnormal fuel injection occurring can be reduced, and the engine can be emergency stopped by closing the electromagnetic on-off valve if necessary. Effect of etc. There is.
【図１】本発明の一実施例を示す燃料噴射装置全体の概
略構成図である。FIG. 1 is a schematic configuration diagram of an entire fuel injection device showing an embodiment of the present invention.
【図２】図１における電磁開閉弁２６の閉止状態を示す
断面図である。FIG. 2 is a cross-sectional view showing a closed state of an electromagnetic opening / closing valve 26 in FIG.
【図３】図２におけるスペーサワッシャ５６の平面図で
ある。3 is a plan view of a spacer washer 56 in FIG.
【図４】図３の線ＩＶ−ＩＶに沿い矢印方向に視た断面
図である。4 is a sectional view taken along line IV-IV in FIG. 3 and viewed in the direction of the arrow.
【図５】図２に示した電磁開閉弁の開弁状態を示した断
面図である。5 is a cross-sectional view showing an open state of the electromagnetic opening / closing valve shown in FIG.
【図６】図２に示した電磁開閉弁の燃料漏洩発生時にお
ける作動状態を示した断面図である。6 is a cross-sectional view showing an operating state of the solenoid opening / closing valve shown in FIG. 2 when a fuel leak occurs.
【図７】本発明に係る燃料噴射装置の開閉タイミングを
示した線図である。FIG. 7 is a diagram showing an opening / closing timing of the fuel injection device according to the present invention.
【図８】従来の蓄圧式燃料噴射装置における安全装置を
示す断面図である。FIG. 8 is a sectional view showing a safety device in a conventional pressure accumulation type fuel injection device.
１０…エンジン、１２…電磁式燃料噴射弁、１４…コン
トロールユニット（制御手段）、２４…燃料噴射管、２
６…電磁開閉弁、２８…蓄圧室、３０…燃料供給ポン
プ、３４…燃料タンク、３６…フィードポンプ、３８…
弁ハウジング、４０及び４２…弁通路、４４…アウタバ
ルブ（第１弁要素）、４６…インナバルブ（第２弁要
素）、５０…弁シート、５２…弁体、６２…ソレノイ
ド、６４…第１弁スプリング、６６…第２弁スプリン
グ。10 ... Engine, 12 ... Electromagnetic fuel injection valve, 14 ... Control unit (control means), 24 ... Fuel injection pipe, 2
6 ... Electromagnetic on-off valve, 28 ... Accumulation chamber, 30 ... Fuel supply pump, 34 ... Fuel tank, 36 ... Feed pump, 38 ...
Valve housing, 40 and 42 ... Valve passage, 44 ... Outer valve (first valve element), 46 ... Inner valve (second valve element), 50 ... Valve seat, 52 ... Valve body, 62 ... Solenoid, 64 ... First valve spring , 66 ... Second valve spring.
Claims (9)
を貯溜する蓄圧室、エンジンの各気筒に設けられた電磁
式燃料噴射弁、同燃料噴射弁と上記蓄圧室とを連通する
燃料通路に介装された常閉型の電磁開閉弁、及び上記燃
料噴射弁の開弁時期に略同期して上記電磁開閉弁を開動
させる制御手段を備えたことを特徴とする蓄圧式燃料噴
射装置。1. A pressure accumulating chamber for accumulating high-pressure fuel supplied from a fuel supply pump, an electromagnetic fuel injection valve provided in each cylinder of an engine, and a fuel passage communicating between the fuel injection valve and the pressure accumulating chamber. A pressure-accumulation fuel injection device comprising: a normally closed electromagnetic on-off valve mounted and a control means for opening the electromagnetic on-off valve substantially in synchronization with the opening timing of the fuel injection valve.
端において上記蓄圧室に一体的に配設されたことを特徴
とする請求項１記載の蓄圧式燃料噴射装置。2. The pressure-accumulation fuel injection device according to claim 1, wherein the electromagnetic on-off valve is integrally arranged in the pressure accumulation chamber at an upstream end of the fuel passage.
れた弁ハウジングと、同弁ハウジングの内部に形成され
上記蓄圧室と上記燃料通路とを連通する弁通路と、同弁
通路に介装された弁部材と、上記制御手段により駆動さ
れて上記弁部材を開閉するソレノイドとを有することを
特徴とする請求項１又は請求項２記載の蓄圧式燃料噴射
装置。3. The solenoid opening / closing valve includes a valve housing connected to the pressure accumulating chamber, a valve passage formed inside the valve accommodating chamber to connect the pressure accumulating chamber and the fuel passage, and the valve passage. 3. The pressure-accumulation fuel injection device according to claim 1, further comprising a mounted valve member and a solenoid driven by the control means to open and close the valve member.
記ソレノイドによって開位置又は閉位置に選択的に駆動
される第１弁要素と、上記弁シートと協働して上記弁通
路を開閉する弁体を具えた第２弁要素とから構成され、
上記第１弁要素は、第１の弁スプリングによって上記弁
シートが上記第２弁要素の弁体に係合する方向に弾性的
に付勢されていることを特徴とする請求項３記載の蓄圧
式燃料噴射装置。4. A first valve element, wherein the valve member has a valve seat at one end and is selectively driven to an open position or a closed position by the solenoid; and a first valve element which cooperates with the valve seat to open and close the valve passage. And a second valve element having a valve body for
The pressure accumulation according to claim 3, wherein the first valve element is elastically biased by a first valve spring in a direction in which the valve seat engages with a valve body of the second valve element. Fuel injector.
を具えた中空筒状のアウタバルブであり、かつ上記第２
弁要素が上記アウタバルブの中空孔内に摺動自在に嵌装
されたガイド脚と上記弁体とを有し、上記アウタバルブ
に対し同軸的に配設されたインナバルブであることを特
徴とする請求項４記載の蓄圧式燃料噴射装置。5. The first valve element is a hollow cylindrical outer valve having a valve seat at one end thereof, and the second valve element is provided.
A valve element is an inner valve which has a guide leg slidably fitted in a hollow hole of the outer valve and the valve body, and is arranged coaxially with the outer valve. 4. The pressure-accumulation fuel injection device described in 4.
に、かつ摺動自在に上記弁ハウジング内に収容されて、
その中空孔が上記弁通路の一部を形成すると共に、上記
インナバルブが、第２の弁スプリングによって上記弁体
が弁シートから離座する方向に弾性的に付勢されている
ことを特徴とする請求項５記載の蓄圧式燃料噴射装置。6. The outer valve has an outer peripheral surface oil-tightly and slidably accommodated in the valve housing,
The hollow hole forms a part of the valve passage, and the inner valve is elastically biased by a second valve spring in a direction in which the valve body is separated from the valve seat. The pressure-accumulation fuel injection device according to claim 5.
室側に配設され、かつ上記アウタバルブが同弁通路の上
記燃料通路側に配設され、さらにアウタバルブに隣接す
る弁ハウジング内に上記ソレノイドが配置されているこ
とを特徴とする請求項５又は請求項６記載の蓄圧式燃料
噴射装置。7. The inner valve is disposed on the accumulator chamber side of the valve passage, the outer valve is disposed on the fuel passage side of the valve passage, and the solenoid is provided in a valve housing adjacent to the outer valve. The pressure-accumulation fuel injection device according to claim 5 or 6, wherein the pressure-accumulation fuel injection device is arranged.
て、上記燃料噴射弁の燃料噴射開始時点より僅かに早く
開放され、かつ同燃料噴射弁の燃料噴射終了と同時に又
は僅かに遅れて閉鎖されるように、開閉されることを特
徴とする請求項１記載の蓄圧式燃料噴射装置。8. The electromagnetic on-off valve is opened by the control means slightly earlier than the fuel injection start time of the fuel injection valve and closed at the same time as or slightly after the end of fuel injection of the fuel injection valve. The pressure-accumulation fuel injection device according to claim 1, wherein the pressure-accumulation fuel injection device is opened and closed as described above.
料通路の漏洩による圧力降下に応動して、上記制御手段
の作動とは拘わりなく、上記蓄圧室内の燃料圧力によっ
て自動的に閉鎖されるように構成されたことを特徴とす
る請求項１記載の蓄圧式燃料噴射装置。9. The electromagnetic on-off valve is automatically closed by the fuel pressure in the pressure accumulating chamber regardless of the operation of the control means in response to a pressure drop due to leakage of a fuel passage downstream of the electromagnetic on-off valve. The pressure-accumulation fuel injection device according to claim 1, wherein the pressure-accumulation fuel injection device is configured as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13095195A JP3743021B2 (en) | 1995-04-19 | 1995-04-19 | Accumulated fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13095195A JP3743021B2 (en) | 1995-04-19 | 1995-04-19 | Accumulated fuel injection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08291777A true JPH08291777A (en) | 1996-11-05 |
| JP3743021B2 JP3743021B2 (en) | 2006-02-08 |
Family
ID=15046469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13095195A Expired - Fee Related JP3743021B2 (en) | 1995-04-19 | 1995-04-19 | Accumulated fuel injection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3743021B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4869346B2 (en) * | 2005-08-02 | 2012-02-08 | ロラーンジェ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Fuel injection device for internal combustion engine |
| CN108506130A (en) * | 2018-04-18 | 2018-09-07 | 莆田市宏业精密机械有限公司 | Reduce the fuel injector of high-pressure common rail fuel oil dynamic leakage |
-
1995
- 1995-04-19 JP JP13095195A patent/JP3743021B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4869346B2 (en) * | 2005-08-02 | 2012-02-08 | ロラーンジェ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Fuel injection device for internal combustion engine |
| CN108506130A (en) * | 2018-04-18 | 2018-09-07 | 莆田市宏业精密机械有限公司 | Reduce the fuel injector of high-pressure common rail fuel oil dynamic leakage |
| CN108506130B (en) * | 2018-04-18 | 2024-06-11 | 莆田市博泰动力设备有限公司 | Fuel injector capable of reducing dynamic leakage of high-pressure common rail fuel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3743021B2 (en) | 2006-02-08 |
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