JPS5877160A - Fuel injector - Google Patents

Fuel injector

Info

Publication number
JPS5877160A
JPS5877160A JP56175398A JP17539881A JPS5877160A JP S5877160 A JPS5877160 A JP S5877160A JP 56175398 A JP56175398 A JP 56175398A JP 17539881 A JP17539881 A JP 17539881A JP S5877160 A JPS5877160 A JP S5877160A
Authority
JP
Japan
Prior art keywords
pressure
fuel
oil
valve
fuel injection
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.)
Pending
Application number
JP56175398A
Other languages
Japanese (ja)
Inventor
Hideo Komada
駒田　秀朗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
Priority to JP56175398A priority Critical patent/JPS5877160A/en
Publication of JPS5877160A publication Critical patent/JPS5877160A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive

Landscapes

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

Abstract

PURPOSE:To make the engine workable even if the control unit has got out of order in such a way that an auxiliary plunger pump by which fuel oil is metered and pressure-fed is juxtaposed on a fuel injector equipped with a fuel booster. CONSTITUTION:Pressure-reducing valves 6, 8 are energized respectively by a control unit 10, and pressurized oil from an oil pressure source 1 is arranged to its compatible value, and it is fed into a pressure chamber 32 of a fuel injection nozzle 9. When the control unit 10 gets out of order, at the same time the pressure-reducing valves 6, 8 becomes incontrollable, and a change-over valve 7 becomes incapable of changing over, an oil pump 3 is stopped, pressure in the pressure chamber 32 of the fuel injection nozzle 9 is lowered, and a needle valve 30 is energized only by a spring 31. Then, a plunger pump 21 is driven, by which fuel to be fed through a compression chamber 16 into a fuel sump 34 lifts the needle valve 30 against the force of said spring 31, and the fuel is injected through the injection nozzle 9.

Description

【発明の詳細な説明】 この発明はディーゼルエンジン用燃料噴射装置、特に燃
料噴射ノズルに供給する燃料を燃料増圧器により増圧さ
せて行なうようにした燃料噴射装置に関するものである
〇 この種の燃料噴射装置として、例えば当山願人が提出し
た特願昭５６−９１６７号があるが、この発明にあって
、燃料増圧器１０のピストン室１４に圧油の供給制御を
行なう切換弁７の制御、燃料噴射ノズル２４の開弁を制
御するためにノズルニーモル押え３２に圧油の供給を制
御する切換弁３８の制御等は、コントロールユニット３
９からの指令により行なわれて、適正な燃料が適正なタ
イミングでシリンダ内に噴射されるシステムであります
Ｏ し−かじ、特に船舶に使用される場合には、安全性の配
慮をしなければならない。前述したようなシステムでは
、コントロールユニット２９が故障すると、切換弁７．
３８の切換制御不能となり、このために燃料増圧器ｌＯ
の作動不良及び燃料噴射ノズル２４が開又は閉られたま
まとなり、燃料噴射ノズル２４からの燃料噴射制御が出
来ず、エンジンの駆動が出来なくなって、船舶にあって
は海上に漂流するきわめて危険の状態となる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection device for a diesel engine, and particularly to a fuel injection device that increases the pressure of fuel supplied to a fuel injection nozzle using a fuel pressure booster.〇 This type of fuel injection device As an example of an injection device, there is, for example, Japanese Patent Application No. 1983-9167 filed by Ganjin Toyama, and in this invention, the control of the switching valve 7 that controls the supply of pressure oil to the piston chamber 14 of the fuel pressure booster 10, The control unit 3 controls the switching valve 38 that controls the supply of pressure oil to the nozzle knee mold presser 32 in order to control the opening of the fuel injection nozzle 24.
This is a system in which the appropriate fuel is injected into the cylinder at the appropriate timing based on commands from the engine. . In a system such as that described above, if the control unit 29 fails, the switching valve 7.
38 becomes uncontrollable, and as a result, the fuel pressure booster lO
malfunction and the fuel injection nozzle 24 remains open or closed, making it impossible to control the fuel injection from the fuel injection nozzle 24, making it impossible to drive the engine, which is extremely dangerous for ships and causing the ship to drift out to sea. state.

このために、この発明にあっては、コントロールユニッ
トが故障した状態であっても機能の低下はあるもののエ
ンジンを動かすことができ安全性を高めた燃料噴射装置
を提供するもので、この技術的課題を解決するため、圧
油を切換手段を介して燃料増圧器のピストン室に導ひく
と共に、燃料増圧器の圧縮室には、噴射される燃料油が
調量されて圧送するプランジャーポンプにより供給され
るようにし、燃料噴射ノズルのニードル弁はスプリング
により閉弁方向に押圧されると共に、スプリングの押圧
方向と同方向に圧力が加えられてなり、間欠的に且つ調
量されて圧送された燃料油を燃料増圧器で加圧させ、こ
の加圧燃料が予め定められた開弁圧を越えると、ニード
ル弁かりフトして燃料を噴射するようにしたものである
と共に、コントロールユニシトの故障により燃料増圧器
が作動不能となっても燃料噴射ノズルのニードル弁付勢
の圧油をなくしスプリングだけでニードル弁を付勢する
ようにして、調量して送油するプランジャーポンプにて
燃料の噴射が行なわれるようにし、コントロールユニッ
トの故障があっても機能の低下があるにもかかわらすエ
ンジンを動かすことができるものである。For this reason, the present invention provides a fuel injection device that can operate the engine even if the control unit is in a malfunctioning state, although the functionality may be degraded, increasing safety. In order to solve the problem, the pressure oil is guided to the piston chamber of the fuel pressure booster through a switching means, and the fuel oil to be injected is metered and pumped into the compression chamber of the fuel pressure booster using a plunger pump. The needle valve of the fuel injection nozzle was pressed in the closing direction by a spring, and pressure was applied in the same direction as the pressing direction of the spring, so that the fuel was fed intermittently and at a metered amount. Fuel oil is pressurized by a fuel pressure booster, and when this pressurized fuel exceeds a predetermined valve opening pressure, the needle valve lifts and fuel is injected. Even if the fuel pressure booster becomes inoperable, the pressure oil that biases the needle valve of the fuel injection nozzle is eliminated and the needle valve is biased only by the spring, allowing the plunger pump to meter and feed fuel to the fuel injection nozzle. The system allows the engine to be injected even if the control unit fails, even if its functionality is degraded.

以下、この発明の実施例を図面により説明する。Embodiments of the present invention will be described below with reference to the drawings.

ｌは圧油供給源で、作動油タンク２と、作動油を加圧供
給する送油ポンプ３と、該送油ポンプ駆動用の定回転用
のモータ４と、圧力設定用のＩＪ　ＩＪ−フ弁５とより
成り、送油ポンプ３の吐出側には、電磁比例型の減圧弁
６を介して電磁操作型の切換弁７と、電磁比例型の減圧
弁８を介して燃料噴射ノズル９の圧力室３２にそれぞれ
連絡されている。1 is a pressure oil supply source, which includes a hydraulic oil tank 2, an oil pump 3 that supplies hydraulic oil under pressure, a constant rotation motor 4 for driving the oil pump, and an IJ and IJ-F for pressure setting. On the discharge side of the oil feed pump 3, an electromagnetically operated switching valve 7 is connected via an electromagnetic proportional pressure reducing valve 6, and a fuel injection nozzle 9 is connected to the fuel injection nozzle 9 via an electromagnetic proportional pressure reducing valve 8. The pressure chambers 32 are connected to each other.

電磁比例型の減圧弁６及び８は、それぞれコントロール
ユニット１０からの制御信号により作動され、油圧供給
源１からの圧油を適正な値に減圧して切換弁７及び燃料
噴射ノズル９の圧力室３２内にそれぞれ供給している。The electromagnetic proportional pressure reducing valves 6 and 8 are each operated by a control signal from the control unit 10, and reduce the pressure of the pressure oil from the hydraulic pressure supply source 1 to an appropriate value, thereby filling the pressure chambers of the switching valve 7 and the fuel injection nozzle 9. 32, respectively.

切換弁７は、電磁操作型のもので、コントロールユニッ
ト１０からの切換信号により切換えられ、下記する燃料
増圧器１１のピストン室１５を圧油供給源１側とタンク
２側に選択的に接続するものである。The switching valve 7 is of an electromagnetically operated type, and is switched by a switching signal from the control unit 10, and selectively connects the piston chamber 15 of the fuel pressure booster 11 described below to the pressure oil supply source 1 side and the tank 2 side. It is something.

燃料増圧器１１は大径のボア１２ａと小径のボアｉ２ｂ
とが連通して上下に形成され、該ボア１２Ｋ。The fuel pressure booster 11 has a large diameter bore 12a and a small diameter bore i2b.
The bore 12K is formed vertically in communication with the bore 12K.

１２ｂ内に大径のピストン１３ａと小径のピストン１３
ｂとより成るサーボピストン１４が径に対応して配され
、該サーボピストン１４０大径ピストン１３ａの上方部
にピストン室１５が設けられている。またサーボピスト
ン１４の小径のピストン１３ｂの下方には、嵌合のボア
１２ｂとより圧縮室１６が設けられ、該圧縮室１６は、
燃料油の供給側１７と、下記する燃料噴射ノズル９に接
続されている。A large diameter piston 13a and a small diameter piston 13 are inside 12b.
A servo piston 14 is arranged corresponding to its diameter, and a piston chamber 15 is provided above the large diameter piston 13a of the servo piston 140. Further, a compression chamber 16 is provided below the small-diameter piston 13b of the servo piston 14 by a fitting bore 12b, and the compression chamber 16 is
It is connected to a fuel oil supply side 17 and a fuel injection nozzle 9, which will be described below.

燃料油の供給側１７は、送油ポンプ１８と、該送油ポン
プを回転させるモータ１９と、圧力を調節するリリーフ
弁２０と、送油ポンプから供給される燃料油を調量且つ
加圧して供給するプランジャーポンプ２１とより構成さ
れ、プランジャーポンプ２１にて調量加圧された燃料が
チェックパルプ２２を介して前記圧縮室１７内に送られ
る。The fuel oil supply side 17 includes an oil pump 18, a motor 19 that rotates the oil pump, a relief valve 20 that adjusts pressure, and a system that measures and pressurizes the fuel oil supplied from the oil pump. Fuel metered and pressurized by the plunger pump 21 is sent into the compression chamber 17 via a check pulp 22.

プランジャーポンプ−２１は、エンジン２３の駆動力に
てプランジャ２４が上下動され、そのプランジャ２４に
形成のり−ド２５と吸入孔２６との、−ノ 関係によシ送出量が決定されるものでアシ、送出量の可
変制御は、プランジャ２４と噛合しているコントロール
ラック２７を回転させることで行なわれる。尚リリーフ
弁２８はプランジャーポンプ２１から送出される圧の最
高圧を調整している。In the plunger pump 21, a plunger 24 is moved up and down by the driving force of an engine 23, and the delivery amount is determined by the relationship between the slope 25 formed on the plunger 24 and the suction hole 26. Variable control of the feed amount is performed by rotating the control rack 27 that is engaged with the plunger 24. Note that the relief valve 28 regulates the maximum pressure delivered from the plunger pump 21.

しかして、モータ１９の回転で、送油ポンプ１８が回転
され、リリーフ弁２０で設定された燃料油をプランジャ
ポンプ２１に供給し、該プランジャポンプ２１が燃料油
を吸入加圧し、調量された燃料がチェックバルブ２２を
介して燃料増圧器１１の圧縮室１６内に供給され、該圧
縮室１６内に充満することでサーボピストｙｌ　４を上
°方に押し上げる。そして燃料増圧器１１のピストン室
１５内に圧油が供給されて、サーボピストン１４は下方
へ動かされ、圧縮室１６内の燃料油は圧縮され、増圧燃
料油は燃料噴射ノズル９へ圧送される。As the motor 19 rotates, the oil feed pump 18 is rotated, and the fuel oil set by the relief valve 20 is supplied to the plunger pump 21, and the plunger pump 21 sucks in the fuel oil, pressurizes it, and adjusts the amount. Fuel is supplied into the compression chamber 16 of the fuel booster 11 through the check valve 22, and when the compression chamber 16 is filled, the servo piston yl 4 is pushed upward. Then, pressure oil is supplied into the piston chamber 15 of the fuel pressure booster 11, the servo piston 14 is moved downward, the fuel oil in the compression chamber 16 is compressed, and the pressurized fuel oil is sent under pressure to the fuel injection nozzle 9. Ru.

燃料噴射ノズル９は、一般的に自動弁と称される構成の
もので、本体２９と、その内部に配されたニードル弁３
０と、このニードル弁３０を閉弁方向に付勢するスプリ
ング３１と、このスプリング３１の押圧方向に付勢する
圧油を導びく圧力室３２とより成り、圧力呈シ２には前
記した減圧弁８を介して所望の圧力となった圧油が供給
されている。この圧力室３２に供給される圧力の調整に
て開弁圧の調整が任意に出来るものである。なお、リリ
ーフ弁３３はニードル弁３０のリフトによる圧力室３２
内の圧力の上昇を防止するために設けられたものである
。The fuel injection nozzle 9 has a configuration generally called an automatic valve, and includes a main body 29 and a needle valve 3 disposed inside the main body 29.
0, a spring 31 that biases this needle valve 30 in the valve closing direction, and a pressure chamber 32 that guides pressure oil that biases this spring 31 in the pressing direction. Pressure oil at a desired pressure is supplied via a valve 8. By adjusting the pressure supplied to the pressure chamber 32, the valve opening pressure can be arbitrarily adjusted. Note that the relief valve 33 is a pressure chamber 32 caused by the lift of the needle valve 30.
This is provided to prevent the pressure from increasing inside the pipe.

この燃料噴射ノズル９は、燃料増圧器１１で増圧された
燃料が燃料溜り３４に供給されニードル弁３０のプレー
ステージに加えられる圧力がスプリング３１及び圧力室
３２内の圧力の付勢力よりまさると、ニードル弁３０が
スプリング３１及び圧力に抗リフトされ噴孔３５を開き
、該噴孔３５から燃料ｔ−噴射され、圧力の降下に供な
ってニードル弁３０は閉じられる。This fuel injection nozzle 9 is operated when fuel whose pressure is increased by a fuel pressure intensifier 11 is supplied to a fuel reservoir 34 and the pressure applied to the play stage of the needle valve 30 is greater than the urging force of the spring 31 and the pressure inside the pressure chamber 32. Then, the needle valve 30 is lifted by the spring 31 and the pressure to open the nozzle hole 35, the fuel is injected from the nozzle hole 35, and as the pressure decreases, the needle valve 30 is closed.

コントロールユニット１０にはエンジン２３の回転数検
出器３６がらエンジンの回転数、燃料噴射ノズル９のニ
ードル弁３ｏのリフト時期の検出装置３７からリフト時
期の検出信号が入力され、これらは処理されて、切換弁
６への切換信号、電磁比例型の減圧弁６，８への制御信
号を出方している。The control unit 10 receives the engine rotation speed from the rotation speed detector 36 of the engine 23 and the lift timing detection signal from the lift timing detection device 37 of the needle valve 3o of the fuel injection nozzle 9, and these are processed. A switching signal to the switching valve 6 and a control signal to the electromagnetic proportional pressure reducing valves 6 and 8 are output.

上述の構成にあって、燃料噴射装置の作動は、送油ポン
プ３及び１８が駆動され、作動油は電磁比例型の減圧弁
６，８にて所望の値に減圧され、アキュムレータ３６．
３８に貯えられている。切換弁７がコントロールユニツ
）１０がらの指令でｎ位置から■位置に切換えられると
、燃料増圧器１１はピストン室１５内に供給され、該サ
ーボピストン１４を押圧する。このために、サーボピス
トン１４の下降により予めプランジャーポンプ２１から
圧縮室１６内に調量供給されている燃料（油）が圧縮増
圧され、増圧された燃料が燃料噴射ノズル９に供給され
る。この供給された燃料がスプリング３１と圧油とより
成る付勢力との関係で、ニードル弁３０のリフトが制御
され、ニードル弁３０がリフトする圧力（開弁圧）に達
すると、噴孔３５が開き燃料が噴射され、そして開弁圧
より低下することで噴孔３５が閉じられ噴射が終了する
。In the above-described configuration, the fuel injection device operates by driving the oil feed pumps 3 and 18, reducing the pressure of the hydraulic oil to a desired value by the electromagnetic proportional pressure reducing valves 6 and 8, and then passing the accumulator 36.
It is stored in 38. When the switching valve 7 is switched from the n position to the (2) position by a command from the control unit 10, the fuel pressure booster 11 is supplied into the piston chamber 15 and presses the servo piston 14. For this purpose, as the servo piston 14 descends, the pressure of the fuel (oil) that has been previously metered into the compression chamber 16 from the plunger pump 21 is compressed and increased, and the increased pressure is supplied to the fuel injection nozzle 9. Ru. The lift of the needle valve 30 is controlled by the relationship between the supplied fuel and the urging force made up of the spring 31 and pressure oil, and when the needle valve 30 reaches a lifting pressure (valve opening pressure), the nozzle hole 35 opens. The valve opens and fuel is injected, and when the pressure decreases below the valve opening pressure, the nozzle hole 35 is closed and the injection ends.

なお、噴射量の制御は、プランジャーポンプ２１から送
出される送出量の可変で行なわれ、具体的にはコントロ
ールラック２７を適宜な手段で動かすことで行なわれる
。The injection amount is controlled by varying the amount of injection from the plunger pump 21, and specifically by moving the control rack 27 by appropriate means.

また、燃料噴射の開弁圧の調整は、電磁比例型の減圧弁
８の減圧調整で行なわれ、この開弁圧の調整により、同
一の噴射量であっても噴射期間の調整、即ち噴射率の調
整が可能となり、よシ細かい制御が可能となるものでる
る。Further, the valve opening pressure for fuel injection is adjusted by reducing the pressure of the electromagnetic proportional pressure reducing valve 8. By adjusting the valve opening pressure, even if the injection amount is the same, the injection period can be adjusted, that is, the injection rate. This makes it possible to make adjustments, allowing for more detailed control.

コントロールユニット１０が故障が発生して、減圧弁６
，８の調整不能、切換弁７の切換不能となった際には、
送油ポンプ３を停止させることで、燃料噴射ノズル９の
圧力室３２内の圧力が低下する。このために、ニードル
弁３０はスプリング３１のみによる付勢となる。When a failure occurs in the control unit 10, the pressure reducing valve 6
, 8 cannot be adjusted or the switching valve 7 cannot be switched,
By stopping the oil feed pump 3, the pressure within the pressure chamber 32 of the fuel injection nozzle 9 decreases. For this reason, the needle valve 30 is biased only by the spring 31.

この結果１プランジヤーポング２１から圧縮室１６を介
して燃料噴射ノズル９の燃料溜り３４へ供給された燃料
は、付勢力の小さいスプリング３１に抗してニードル弁
３ｏをリフトさせて噴射を行なうことができるものであ
る。その際にも噴射量の制御もコントロールラック２７
を動かすことで行なうことができる。この燃料は機能の
低下こそ免れないが、充分とはいえないまでもエンジン
をコントロールして動かすことができるものである。As a result, the fuel supplied from the first plunger pong 21 through the compression chamber 16 to the fuel reservoir 34 of the fuel injection nozzle 9 is injected by lifting the needle valve 3o against the spring 31 with a small urging force. It is something that can be done. At that time, the control rack 27 also controls the injection amount.
This can be done by moving. Although this fuel inevitably reduces its functionality, it is still able to control and operate the engine, although it may not be sufficient.

この発明は上述のように構成したので、コントロールユ
ニットの故障によっても機能の低下にあるもののエンジ
ンを制御し動かすことができ、安全性の配慮を持つ燃料
噴射装置を提供できるものである。Since the present invention is configured as described above, it is possible to control and operate the engine even if the control unit malfunctions, even if its function is degraded, and it is possible to provide a fuel injection device that takes safety into account.

また、開弁圧の調整を、圧力調整用の可変型の減圧弁を
調整で燃料噴射ノズルの圧力室内の圧力が変化されて行
なうことができ、噴射率の調整も可能となるものである
。Further, the valve opening pressure can be adjusted by changing the pressure inside the pressure chamber of the fuel injection nozzle by adjusting a variable pressure reducing valve for pressure adjustment, and the injection rate can also be adjusted.

【図面の簡単な説明】[Brief explanation of the drawing]

図はこの発明の実施例を示す構成図である。 ７・・ｅ電磁操作型の切換弁、９・・・燃料噴射ノズル
、１１・・・燃料増圧器、１５・・・ピストン室、１６
・・・圧縮％、２１・・・プランジャーポンプ、３０・
・・ニードル弁、３１・・・スプリング、３２・・・圧
力呈。The figure is a configuration diagram showing an embodiment of the present invention. 7... e electromagnetically operated switching valve, 9... fuel injection nozzle, 11... fuel pressure intensifier, 15... piston chamber, 16
... Compression %, 21 ... Plunger pump, 30.
...Needle valve, 31...Spring, 32...Pressure pressure.

Claims (1)

【特許請求の範囲】 １、　圧油を切換手段を介して燃料増圧器のピストン室
に導び（と共に、燃料増圧器の圧縮室には、噴射される
燃料油が調量されて圧送するプランジャーポンプにより
供給されるようにし、燃料噴射ノズルのニードル弁はス
プリ・ングにより閉弁方向に押圧されると共に、スプリ
ングの押圧方向と同方向に圧油の圧力が加えられてなる
ことを特徴とする燃料噴射装置。 ２、　ニードル弁にスプリングの押圧方向と同方向に加
えられる圧油の圧力を圧力調整用の可変型の減圧弁にて
調整可能にしたことを特徴とする特許請求の範囲第１項
記載の燃料噴射装置。 ３、圧力調整用の可変型の減圧弁を電磁比例型の減圧弁
を用いたことを特徴とする特許請求の範囲第２項記載の
燃料噴射装置。[Scope of Claims] 1. Pressurized oil is introduced into the piston chamber of the fuel pressure intensifier through a switching means (and a plan is provided in which the fuel oil to be injected is metered and pumped into the compression chamber of the fuel pressure intensifier). The needle valve of the fuel injection nozzle is pressed in the valve closing direction by a spring ring, and the pressure of pressure oil is applied in the same direction as the pressing direction of the spring. 2. A variable pressure reducing valve for adjusting the pressure can adjust the pressure of the pressure oil applied to the needle valve in the same direction as the pressing direction of the spring. The fuel injection device according to claim 1. 3. The fuel injection device according to claim 2, wherein an electromagnetic proportional pressure reducing valve is used as the variable pressure reducing valve for pressure adjustment.
JP56175398A 1981-10-30 1981-10-30 Fuel injector Pending JPS5877160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56175398A JPS5877160A (en) 1981-10-30 1981-10-30 Fuel injector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56175398A JPS5877160A (en) 1981-10-30 1981-10-30 Fuel injector

Publications (1)

Publication Number Publication Date
JPS5877160A true JPS5877160A (en) 1983-05-10

Family

ID=15995391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56175398A Pending JPS5877160A (en) 1981-10-30 1981-10-30 Fuel injector

Country Status (1)

Country Link
JP (1) JPS5877160A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60162022A (en) * 1984-01-31 1985-08-23 Kawasaki Heavy Ind Ltd Fuel injection control device of internal-combustion engine
DE3536021A1 (en) * 1984-10-13 1986-04-17 Diesel Kiki Co. Ltd., Tokio/Tokyo MULTI-STAGE FUEL INJECTION SYSTEM FOR COMBUSTION ENGINES
JPS6196169A (en) * 1984-10-15 1986-05-14 Diesel Kiki Co Ltd Multi-stage fuel injection device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60162022A (en) * 1984-01-31 1985-08-23 Kawasaki Heavy Ind Ltd Fuel injection control device of internal-combustion engine
JPH0435611B2 (en) * 1984-01-31 1992-06-11 Kawasaki Heavy Ind Ltd
DE3536021A1 (en) * 1984-10-13 1986-04-17 Diesel Kiki Co. Ltd., Tokio/Tokyo MULTI-STAGE FUEL INJECTION SYSTEM FOR COMBUSTION ENGINES
JPS6196169A (en) * 1984-10-15 1986-05-14 Diesel Kiki Co Ltd Multi-stage fuel injection device

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