EP2150696B1 - Injector for a fuel injection system - Google Patents

Injector for a fuel injection system Download PDF

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Publication number
EP2150696B1
EP2150696B1 EP08759421A EP08759421A EP2150696B1 EP 2150696 B1 EP2150696 B1 EP 2150696B1 EP 08759421 A EP08759421 A EP 08759421A EP 08759421 A EP08759421 A EP 08759421A EP 2150696 B1 EP2150696 B1 EP 2150696B1
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EP
European Patent Office
Prior art keywords
pressure
chamber
pressure booster
injector
needle
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08759421A
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German (de)
French (fr)
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EP2150696A1 (en
Inventor
Markus Melzer
Joachim Boltz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2150696A1 publication Critical patent/EP2150696A1/en
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Publication of EP2150696B1 publication Critical patent/EP2150696B1/en
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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification

Definitions

  • the present invention relates to an injector for a fuel injection system of an internal combustion engine, in particular in a motor vehicle.
  • an increase in the injection pressure is the focus of further development.
  • a reduction of the hydraulic vibrations also has a favorable effect on the nozzle seat wear.
  • the increase in the injection pressure is usually achieved in known injectors in that a pressure boost is made, by means of which the fuel is pressurized with a pressure greater than the pressure of the system, ie with a multiple of the atmospheric pressure and injected with this high pressure in the combustion chamber becomes.
  • a supply line from the fuel to the pressure booster usually takes place via a plurality of interconnected holes, which, however, weaken the injector body, see document EP1416152 A1 and thereby affect the durability of the same and are also prone to leakage.
  • the injector according to the invention with the features of claim 1 has the advantage that no holes for a hydraulic connection of a pressure booster must be provided in the injector body and thereby the durability of the injector according to the invention can be increased.
  • the injector according to the invention has, as usual, a pressure booster section, also called actuator section, and a needle section, wherein in the latter hubver pla a nozzle needle for controlling an injection of fuel through at least one injection hole is arranged.
  • the pressure intensifier used to increase the fuel injection pressure has a stepped piston, a control rod and a pressure booster ground, which all together define a coupler space.
  • a coupling path extending in the control rod is provided in the injector according to the invention, which connects the coupler chamber via a valve device located outside the injector to a high-pressure fuel supply.
  • the core advantage is thus in the simple central connection of the fuel supply to the pressure booster. This makes it possible to realize a relatively high injection pressure while maintaining a moderate system pressure.
  • the injector according to the invention also has a significantly improved multiple injection capability due to its large Injektorhoch horrvolumens and lower pressure fluctuations due to lack of control lines.
  • a quick switching or actuation of the nozzle needle is possible. Due to the fact that consuming and the durability of the injector impairing and leakage-prone holes within the injector body can be omitted, the durability of the injector according to the invention is significantly improved.
  • the control rod expediently engages, with its end facing the nozzle needle, into a cavity embedded in the pressure intensifier bottom, which is hydraulically connected via a connecting path to a needle control chamber, which in turn is delimited by the nozzle needle, a surrounding nozzle needle sleeve and the pressure intensifier base.
  • the communication path axially penetrating the communication path which may be formed as a bore, for example, is centrally located compared to conventional, arranged in the injector bores and thereby significantly easier to manufacture or seal. In particular, eliminates in this solution, a hydraulic wiring in a Injektor redesignwand or outside the injector to the needle control chamber, which presents a structurally simple and mature solution.
  • the stepped piston is surrounded by a stroke sleeve which is adjustable in stroke or by a solid annular wall, wherein the stepped piston, the pressure intensifier bottom and the filling sleeve or the fixed annular wall together define a pressure booster chamber, usually also referred to as a booster chamber.
  • a biasing spring may additionally be provided which is supported at one end on an injector-side stop and the other end on the filling sleeve and biases the latter against the pressure intensifier base.
  • a translation effect is thereby effected by the prevailing between the coupler space and the booster chamber significant differences in size. This makes it possible to achieve a high injection pressure while maintaining a moderate system pressure, whereby the pollutant emission of the engine equipped with the injector according to the invention can be reduced.
  • a high-pressure chamber is arranged in the injector body, in which the control rod, the stepped piston and the filling sleeve or the annular wall are arranged.
  • the high pressure chamber is compared to the coupler space, booster chamber and needle control room significantly larger and has the largest volume.
  • a large-volume high-pressure chamber has a positive effect on pressure oscillations in multiple injections, which can be kept to a low level.
  • the high-pressure fuel supply via a hydraulic line directly to the high-pressure chamber and indirectly connected via the valve means to the coupling path in the control rod.
  • both the direct supply line to the high-pressure chamber and the indirect supply line via the valve device to the coupling path in the control rod at least partially parallel in a Injektorstimplatte, so that a connection of the injector according to the invention to the high-pressure fuel supply via only one side, namely the Injektorstirnplatte is possible.
  • structurally complicated wiring for example, the pressure booster room or the needle control room is not required.
  • an injector 1 according to the invention comprises an injector body 2, which is usually assembled from two sections, namely a needle section 3 arranged at the bottom and a pressure translator section 4 arranged above it.
  • the two sections 3 and 4 can be formed by a suitable connection technique, for example a welded connection or a Be connected to each other screw.
  • a union nut 5 is provided, which receives the needle section 3 and braced against the pressure booster section 4.
  • the union nut 5 is preferably screwed to the pressure booster section 4.
  • the injector 1 is fed by a high-pressure fuel supply 6 which is connected via a hydraulic line 7 directly to a high-pressure chamber 8 arranged in the injector 1 and indirectly via a hydraulic line 7 'having a valve device 9 to a coupling path 11 arranged in a control rod 10.
  • the nozzle needle 13 In the needle section 3 is at least one injection hole 12 and a stroke adjustable arranged nozzle needle 13 for controlling an injection of fuel through the at least one injection hole 12 is provided.
  • the nozzle needle 13 At its end facing away from the at least one spray hole 12, the nozzle needle 13 has a nozzle needle sleeve 14 surrounding it, which is supported by a closing compression spring 15, which is supported on the one hand on the nozzle needle sleeve 14 and on the other hand on the nozzle needle 13 or on a stop arranged there Pressure booster ground 16 is biased.
  • the closing compression spring 15 biases the nozzle needle 13 in its closed position.
  • the nozzle needle 13 is arranged adjustable in stroke in a nozzle chamber 28 which is hydraulically connected via at least one opening provided in the pressure booster 16 passage opening 29 with a pressure booster chamber 27.
  • a pressure booster 17 is arranged to increase a fuel injection pressure relative to a system pressure.
  • the pressure booster 17 has a stepped piston 18, the control rod 10 and the pressure booster base 16, which together define a coupler space 19.
  • the valve device 9 may be formed, for example, as a solenoid valve or piezoelectric actuator or as a 2/2 or 3/2-solenoid or piezo valve, which can represent a 3/2 functionality in combination with a servo valve.
  • the control rod 10 engages with its, the nozzle needle 13 facing the end in a, recessed in the pressure booster cavity 16 cavity 20, which is hydraulically connected via a connection path 21 with a needle control chamber 22.
  • the needle control chamber 22 is of the nozzle needle 13, the surrounding nozzle needle sleeve 14 and the Pressure booster bottom 16 limited.
  • the cavity 20 is connected to the coupler space 19 via the coupling path 11, the coupling path 11 having radial openings 23 in the region of the coupler space 19.
  • a control rod spring 24 may be provided which biases the control rod 10 in the direction of the cavity 20 out, here upwards.
  • a connecting line 30 is also provided, which is formed for example as a bore and which connects the pressure booster chamber 27 to the needle control chamber 22 hydraulically.
  • a throttle device 31 may be provided, for example, the throttle device 31 may be formed in the connection path 21 as a drain throttle and the throttle device 31 in the connecting line 30 as a Z-throttle.
  • the stepped piston 18 of the pressure booster 17 is according to the Fig. 1 to 3 surrounded by a stroke-adjustable on the stepped piston 18 filling sleeve 25.
  • the stepped piston 18 is surrounded by a fixed annular wall 26.
  • the annular wall 26 may be formed separately or integrally with the pressure intensifier base 16.
  • the stepped piston 18, the pressure intensifier base 17 and the filling sleeve 25 or the fixed annular wall 26 define a pressure amplifier rim 27.
  • a stepped piston spring 32 is provided, which is supported on the one hand on an injector-side stop 33 and on the other hand on the stepped piston 18.
  • the stepped piston spring 32 pushes the stepped piston spring 32 the stepped piston 18 upwards and thus biases this in a non-operating state against a stop 33 ', which is formed as an annular outer stage on the control rod 10.
  • the control rod 10 is pressed against an end plate 34, whereby the coupling path 11 is sealed against the high-pressure chamber 8.
  • At least one axial passage opening 35 is provided in the injector body-side stop 33, which hydraulically connects the high-pressure chamber 8 with its section 8 'situated below the stop 33.
  • a biasing spring 36 which biases the filling sleeve 25 against the pressure intensifier base 16.
  • the Biasing spring 36 is formed as a tension spring 37, which is supported at one end on the stepped piston 18 and the other end to the Be SchoHhütse 25 and biases the latter against pressure booster ground 16.
  • the stepped piston 18 is designed as a so-called “free-floating piston", which has no stroke stop on the control rod 10.
  • the control rod 10 as well as in the Fig. 3 and 4 clamped and sealed by the control rod spring 24 against the end plate 34.
  • the advantage here is that rapid pressure changes can be compensated directly by stroke changes of the stepped piston 18 and thereby can be ensured that the injector 1 does not unintentionally, especially at rapid system pressure drop opens.
  • a sealing edge of the nozzle needle sleeve 14 is compared to the embodiments of the injector 1 according to the Fig. 1 and 2 radially outside.
  • a sealing diameter of the nozzle needle sleeve 14 is thus on a larger diameter, whereby an opening is achieved when a pressure in the needle control chamber 22 is greater than in the nozzle chamber 28th
  • a stepped piston return by means of the stepped piston spring 32 is newly solved in order to realize a space advantage can. Therefore, the stepped piston spring 32 is supported via an annular collar 38 on the injector body 2 and presses on a disk 39 on the stepped piston 18 to reset this after completion of the injection process.
  • the mode of operation of the injector 1 according to the invention can be described as follows:
  • valve device 9 For closing the injector 1, the valve device 9 is actuated, in particular closed, whereby the pressures in the needle control chamber 22 and in the coupler chamber 19 rise again to system pressure.
  • the stepped piston spring 32 generates a slight negative pressure in the pressure booster chamber 27, whereby the Be Stirllhülse 25 opens and the provision of the stepped piston 18 in combination with a volume compensation leads to a provision of the injector 1 in its initial position.
  • a particular advantage of the injector 1 according to the invention is the central arrangement of the coupling path 11 within the control rod 10, whereby high-pressure bores in the injector 2 can be omitted.
  • a high injection pressure can be achieved with only a single valve device 9, while the system pressure is moderate.
  • a rapid switching of the nozzle needle 13 and a significantly improved multiple injection capability due to a large volume of the high-pressure chamber 8 and lower pressure fluctuations resulting in missing control lines can be achieved.

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

Abstract

The invention relates to an injector for a fuel injection system of an internal combustion engine, particularly in a motor vehicle, with an injector body which has a pressure booster section and a needle section. At least one injection hole is provided in the needle section. A nozzle needle which has an adjustable stroke is disposed in the needle section for controlling an injection of fuel through the at least one injection hole. A pressure booster is provided for increasing a fuel injection pressure relative to a system pressure. For this purpose, the pressure booster has a double-diameter or stepped piston, a control rod, and a pressure booster bottom which together form the boundary of a coupling chamber. A coupling path extends into the control rod and connects the coupling chamber, over a valve device which is located outside or within the injector, to a high-pressure supply of fuel.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft einen Injektor für eine Kraftstoffeinspritzanlage einer Brennkraftmaschine, insbesondere in einem Kraftfahrzeug.The present invention relates to an injector for a fuel injection system of an internal combustion engine, in particular in a motor vehicle.

Um die Schadstoffemissionen von Brennkraftmaschinen weiter reduzieren zu können, steht vor allem eine Steigerung des Einspritzdrucks im Focus der Weiterentwicklung. Hierbei ist vorteilhafterweise ein großes Kraftstoffvolumen im Injektorkörper anzustreben, um Druckschwingungen bei Mehrfacheinspritzungen möglichst gering halten zu können. Eine Verminderung der hydraulischen Schwingungen wirkt sich auch günstig bezüglich des Düsensitzverschleißes aus. Die Steigerung des Einspritzdruckes wird bei bekannten Injektoren üblicherweise dadurch erreicht, dass eine Druckübersetzung vorgenommen wird, mit Hilfe welcher der Kraftstoff mit einem gegenüber dem Druck des Systems erhöhten Druck, also mit einem Vielfachen des Atmosphärendrucks beaufschlagt wird und mit diesem hohen Druck in die Brennkammer eingedüst wird. Eine Zuleitung vom Kraftstoff zum Druckübersetzer erfolgt dabei üblicherweise über mehrere miteinander verbundene Bohrungen, welche jedoch den Injektorkörper schwächen siehe Dokument EP1416152 A1 und dadurch die Haltbarkeit desselben beeinträchtigen und zudem anfällig für Leckagen sind.In order to be able to further reduce the pollutant emissions of internal combustion engines, an increase in the injection pressure is the focus of further development. In this case, it is advantageous to aim for a large volume of fuel in the injector body, in order to be able to minimize pressure oscillations in the case of multiple injections. A reduction of the hydraulic vibrations also has a favorable effect on the nozzle seat wear. The increase in the injection pressure is usually achieved in known injectors in that a pressure boost is made, by means of which the fuel is pressurized with a pressure greater than the pressure of the system, ie with a multiple of the atmospheric pressure and injected with this high pressure in the combustion chamber becomes. A supply line from the fuel to the pressure booster usually takes place via a plurality of interconnected holes, which, however, weaken the injector body, see document EP1416152 A1 and thereby affect the durability of the same and are also prone to leakage.

Der erfindungsgemäße Injektor mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass im Injektorkörper keine Bohrungen für eine hydraulische Anbindung einer Druckübersetzung vorgesehen werden müssen und dadurch die Haltbarkeit des erfindungsgemäßen Injektors gesteigert werden kann. Der erfindungsgemäße Injektor weist wie üblich einen Druckübersetzerabschnitt, auch Aktorabschnitt genannt, und einen Nadelabschnitt auf, wobei in letzterem hubverstellbar eine Düsennadel zum Steuern einer Einspritzung von Kraftstoff durch wenigstens ein Spritzloch angeordnet ist. Der zur Erhöhung des Kraftstoffeinspritzdruckes verwendete Druckübersetzer weist einen Stufenkolben, eine Steuerstange und einen Druckverstärkerboden auf, die alle zusammen eine Kopplerraum begrenzen. Anstatt von Bohrungen im Injektorkörper ist beim erfindungsgemäßen Injektor ein in der Steuerstange verlaufender Kopplungspfad vorgesehen, der den Kopplerraum über ein außerhalb des Injektors gelegene Ventileinrichtung mit einer Kraftstoffhochdruckversorgung verbindet. Der Kernvorteil liegt somit in der einfachen zentralen Anbindung der Kraftstoffversorgung an den Druckübersetzer. Hierdurch lässt sich ein relativ hoher Einspritzdruck bei gleichzeitig moderatem Systemdruck realisieren. Insbesondere weist der erfindungsgemäße Injektor auch eine deutlich verbesserte Mehrfacheinspritzfähigkeit aufgrund seines großen Injektorhochdruckvolumens und geringere Druckschwankungen aufgrund fehlender Steuerleitungen auf. Darüber hinaus ist auch ein schnelles Schalten beziehungsweise Betätigen der Düsennadel möglich. Durch die Tatsache, dass aufwändige und die Haltbarkeit des Injektors beeinträchtigende sowie leckageanfällige Bohrungen innerhalb des Injektorkörpers entfallen können, wird die Haltbarkeit des erfindungsgemäßen Injektors deutlich verbessert.The injector according to the invention with the features of claim 1 has the advantage that no holes for a hydraulic connection of a pressure booster must be provided in the injector body and thereby the durability of the injector according to the invention can be increased. The injector according to the invention has, as usual, a pressure booster section, also called actuator section, and a needle section, wherein in the latter hubverstellbar a nozzle needle for controlling an injection of fuel through at least one injection hole is arranged. The pressure intensifier used to increase the fuel injection pressure has a stepped piston, a control rod and a pressure booster ground, which all together define a coupler space. Instead of bores in the injector body, a coupling path extending in the control rod is provided in the injector according to the invention, which connects the coupler chamber via a valve device located outside the injector to a high-pressure fuel supply. The core advantage is thus in the simple central connection of the fuel supply to the pressure booster. This makes it possible to realize a relatively high injection pressure while maintaining a moderate system pressure. In particular, the injector according to the invention also has a significantly improved multiple injection capability due to its large Injektorhochdruckvolumens and lower pressure fluctuations due to lack of control lines. In addition, a quick switching or actuation of the nozzle needle is possible. Due to the fact that consuming and the durability of the injector impairing and leakage-prone holes within the injector body can be omitted, the durability of the injector according to the invention is significantly improved.

Zweckmäßig greift die Steuerstange mit ihrem, der Düsennadel zugewandten Ende, in einen, im Druckverstärkerboden eingelassenen Hohlraum ein, welcher über einen Verbindungspfad mit einem Nadelsteuerraum hydraulisch verbunden ist, der seinerseits von der Düsennadel, einer diese umgebenden Düsennadelhülse und dem Druckverstärkerboden begrenzt ist. Der den Druckverstärkerboden axial durchdringende Verbindungspfad, welcher beispielsweise als Bohrung ausgebildet sein kann, ist dabei im Vergleich zu herkömmlichen, im Injektorkörper angeordneten Bohrungen zentral gelegen und dadurch deutlich einfacher herzustellen beziehungsweise abzudichten. Insbesondere entfällt bei dieser Lösung eine hydraulische Leitungsführung in einer Injektorkörperwand oder außerhalb des Injektors zum Nadelsteuerraum, wodurch sich eine konstruktiv einfache und ausgereifte Lösung präsentiert.The control rod expediently engages, with its end facing the nozzle needle, into a cavity embedded in the pressure intensifier bottom, which is hydraulically connected via a connecting path to a needle control chamber, which in turn is delimited by the nozzle needle, a surrounding nozzle needle sleeve and the pressure intensifier base. The communication path axially penetrating the communication path, which may be formed as a bore, for example, is centrally located compared to conventional, arranged in the injector bores and thereby significantly easier to manufacture or seal. In particular, eliminates in this solution, a hydraulic wiring in a Injektorkörperwand or outside the injector to the needle control chamber, which presents a structurally simple and mature solution.

Bei einer vorteilhaften Ausführungsform der erfindungsgemäßen Lösung ist der Stufenkolben von einer an diesem hubverstellbaren Befüllhülse oder von einer festen Ringwand umgeben, wobei der Stufenkolben, der Druckverstärkerboden und die Befüllhülse oder die feste Ringwand zusammen einen Druckverstärkerraum, üblicherweise auch als Übersetzerraum bezeichnet, begrenzen. Bei der Ausführungsform mit einer am Stufenkolben hubverstellbar gelagerten Befüllhülse kann zusätzlich eine Vorspannfeder vorgesehen sein, welche sich einenends an einem injektorkörperseitigen Anschlag und anderenends an der Befüllhülse abstützt und letztere gegen den Druckverstärkerboden vorspannt. Der Stufenkolben, der Druckverstärkerboden und die Befüllhülse oder die Ringwand bilden zusammen mit der für den Fall der Befüllhülse vorgesehenen Vorspannfeder eine Übersetzungseinrichtung zum Übersetzen des im Kopplerraum herrschenden Drucks in einen für den Einspritzvorgang erforderlichen, deutlich höheren Druck im Druckverstärkerraum. Eine Übersetzungswirkung wird dabei durch die zwischen dem Kopplerraum und dem Druckverstärkerraum herrschenden deutlichen Größenunterschiede bewirkt. Dies ermöglicht es, einen hohen Einspritzdruck bei gleichzeitig moderaten Systemdruck zu erzielen, wodurch die Schadstoffemission des mit dem erfindungsgemäßen Injektor ausgerüsteten Verbrennungsmotors reduziert werden kann.In an advantageous embodiment of the solution according to the invention, the stepped piston is surrounded by a stroke sleeve which is adjustable in stroke or by a solid annular wall, wherein the stepped piston, the pressure intensifier bottom and the filling sleeve or the fixed annular wall together define a pressure booster chamber, usually also referred to as a booster chamber. In the embodiment with a staggered adjustable stroke on the stepped piston filling sleeve, a biasing spring may additionally be provided which is supported at one end on an injector-side stop and the other end on the filling sleeve and biases the latter against the pressure intensifier base. The stepped piston, the pressure intensifier bottom and the filling sleeve or the annular wall together with the provided for the case of the filling sleeve biasing a translation device for translating the pressure prevailing in the coupler space in a required for the injection process, significantly higher pressure in the booster chamber. A translation effect is thereby effected by the prevailing between the coupler space and the booster chamber significant differences in size. This makes it possible to achieve a high injection pressure while maintaining a moderate system pressure, whereby the pollutant emission of the engine equipped with the injector according to the invention can be reduced.

Bei einer weiteren vorteilhaften Ausführungsform der erfindungsgemäßen Lösung ist in dem Injektorkörper ein Hochdruckraum angeordnet, in welchem die Steuerstange, der Stufenkolben und die Befüllhülse beziehungsweise die Ringwand angeordnet sind. Der Hochdruckraum ist dabei im Vergleich zum Kopplerraum, Druckverstärkerraum und Nadelsteuerraum deutlich größer und weist das größte Volumen auf. Ein großvolumiger Hochdruckraum wirkt sich positiv auf Druckschwingungen bei Mehrfacheinspritzungen aus, welche durch auf einem geringen Maß gehalten werden können.In a further advantageous embodiment of the solution according to the invention, a high-pressure chamber is arranged in the injector body, in which the control rod, the stepped piston and the filling sleeve or the annular wall are arranged. The high pressure chamber is compared to the coupler space, booster chamber and needle control room significantly larger and has the largest volume. A large-volume high-pressure chamber has a positive effect on pressure oscillations in multiple injections, which can be kept to a low level.

Zweckmäßig ist die Kraftstoffhochdruckversorgung über eine Hydraulikleitung direkt mit dem Hochdruckraum und indirekt über die Ventileinrichtung mit dem Kopplungspfad in der Steuerstange verbunden. Dabei verlaufen sowohl die direkte Zuleitung zum Hochdruckraum als auch die indirekte Zuleitung über die Ventileinrichtung zum Kopplungspfad in der Steuerstange zumindest teilweise parallel in einer Injektorstimplatte, so dass eine Anbindung des erfindungsgemäßen Injektors an die Kraftstoffhochdruckversorgung über lediglich eine Seite, nämlich die Injektorstirnplatte möglich ist. Eine darüber hinaus gehende, konstruktiv aufwendige Leitungsführung, beispielsweise zum Druckverstärkerraum oder zum Nadelsteuerraum ist somit nicht erforderlich.Suitably, the high-pressure fuel supply via a hydraulic line directly to the high-pressure chamber and indirectly connected via the valve means to the coupling path in the control rod. In this case, both the direct supply line to the high-pressure chamber and the indirect supply line via the valve device to the coupling path in the control rod at least partially parallel in a Injektorstimplatte, so that a connection of the injector according to the invention to the high-pressure fuel supply via only one side, namely the Injektorstirnplatte is possible. A beyond going, structurally complicated wiring, for example, the pressure booster room or the needle control room is not required.

Weitere wichtige Merkmale und Vorteile des erfindungsgemäßen Injektors ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the injector according to the invention will become apparent from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings.

Zeichnungendrawings

Ausführungsbeispiele des erfindungsgemäßen Injektors sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert:Embodiments of the injector according to the invention are illustrated in the drawings and are explained in more detail below:

Dabei zeigen die Figuren jeweils schematisch,

Fig. 1
einen stark vereinfachten, prinzipiellen Längsschnitt durch einen erfindungsgemäßen Injektor,
Fig. 2
eine Darstellung wie in Fig. 1, jedoch bei einer anderen Ausführungsform,
Fig. 3
ebenfalls eine Darstellung wie in Fig. 1, jedoch bei einer weiteren Ausführungsform,
Fig. 4
eine weitere Ausführungsform des erfindungsgemäßen Injektors in einem stark vereinfachten, prinzipiellen Längsschnitt.
The figures each show schematically,
Fig. 1
a greatly simplified, schematic longitudinal section through an injector according to the invention,
Fig. 2
a representation like in Fig. 1 but in another embodiment,
Fig. 3
also a representation as in Fig. 1 but in another embodiment,
Fig. 4
a further embodiment of the injector according to the invention in a much simplified, principal longitudinal section.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Entsprechend den Fig. 1 bis 4 umfasst ein erfindungsgemäßer Injektor 1 einen Injektorkörper 2, welcher üblicherweise aus zwei Abschnitten zusammengebaut ist, nämlich aus einem unten angeordneten Nadelabschnitt 3 und einem darüber angeordneten Druckübersetzerabschnitt 4. Die beiden Abschnitte 3 und 4 können dabei durch eine geeignete Verbindungstechnik, beispielsweise eine Schweißverbindung oder eine Schraubverbindung miteinander verbunden sein. In den gezeigten Ausführungsbeispielen ist eine Überwurfmutter 5 vorgesehen, welche den Nadelabschnitt 3 aufnimmt und gegenüber dem Druckübersetzerabschnitt 4 verspannt. Dabei ist die Überwurfmutter 5 vorzugsweise am Druckübersetzerabschnitt 4 angeschraubt.According to the Fig. 1 to 4 an injector 1 according to the invention comprises an injector body 2, which is usually assembled from two sections, namely a needle section 3 arranged at the bottom and a pressure translator section 4 arranged above it. The two sections 3 and 4 can be formed by a suitable connection technique, for example a welded connection or a Be connected to each other screw. In the embodiments shown, a union nut 5 is provided, which receives the needle section 3 and braced against the pressure booster section 4. In this case, the union nut 5 is preferably screwed to the pressure booster section 4.

Gespeist wird der Injektor 1 von einer Kraftstoffhochdruckversorgung 6, welche über eine Hydraulikleitung 7 direkt mit einem im Injektor 1 angeordneten Hochdruckraum 8 und indirekt über eine, eine Ventileinrichtung 9 aufweisende Hydraulikleitung 7' mit einem in einer Steuerstange 10 angeordneten Kopplungspfad 11 verbunden ist.The injector 1 is fed by a high-pressure fuel supply 6 which is connected via a hydraulic line 7 directly to a high-pressure chamber 8 arranged in the injector 1 and indirectly via a hydraulic line 7 'having a valve device 9 to a coupling path 11 arranged in a control rod 10.

Im Nadelabschnitt 3 ist zumindest ein Spritzloch 12 sowie eine hubverstellbar angeordnete Düsennadel 13 zum Steuern einer Einspritzung von Kraftstoff durch das wenigstens eine Spritzloch 12 vorgesehen. An ihrem, dem zumindest einen Spritzloch 12 abgewandten Ende weist die Düsennadel 13 eine diese umgebende Düsennadelhülse 14 auf, welche von einer Schließdruckfeder 15, die sich einerseits an der Düsennadelhülse 14 und andererseits an der Düsennadel 13 beziehungsweise an einem dort angeordneten Anschlag abstützt, gegen einen Druckverstärkerboden 16 vorgespannt wird. Gleichzeitig spannt die Schließdruckfeder 15 die Düsennadel 13 in ihre Schließstellung vor. Die Düsennadel 13 ist dabei hubverstellbar in einem Düsenraum 28 angeordnet, der über zumindest eine im Druckverstärkerboden 16 vorgesehene Durchgangsöffnung 29 mit einem Druckverstärkerraum 27 hydraulisch verbunden ist. Im Druckübersetzerabschnitt 4 ist ein Druckübersetzer 17 zur Erhöhung eines Kraftstoffeinspritzdruckes gegenüber einem Systemdruck angeordnet. Der Druckübersetzer 17 weist eine Stufenkolben 18, die Steuerstange 10 sowie den Druckverstärkerboden 16 auf, die zusammen einen Kopplerraum 19 begrenzen. Erfindungsgemäß verläuft dabei in der Steuerstange 10 der Kopplungspfad 11, der den Kopplerraum 19 über die außerhalb des Injektors 1 gelegene Ventileinrichtung 9 mit der Kraftstoffhochdruckversorgung 6 verbindet. Die Ventileinrichtung 9 kann dabei beispielsweise als Magnetventil oder Piezoaktor oder auch als 2/2 beziehungsweise 3/2-Magnet- oder Piezoventil ausgebildet sein, das in Kombination mit einem Servoventil eine 3/2-Funktionalität darstellen lässt.In the needle section 3 is at least one injection hole 12 and a stroke adjustable arranged nozzle needle 13 for controlling an injection of fuel through the at least one injection hole 12 is provided. At its end facing away from the at least one spray hole 12, the nozzle needle 13 has a nozzle needle sleeve 14 surrounding it, which is supported by a closing compression spring 15, which is supported on the one hand on the nozzle needle sleeve 14 and on the other hand on the nozzle needle 13 or on a stop arranged there Pressure booster ground 16 is biased. At the same time, the closing compression spring 15 biases the nozzle needle 13 in its closed position. The nozzle needle 13 is arranged adjustable in stroke in a nozzle chamber 28 which is hydraulically connected via at least one opening provided in the pressure booster 16 passage opening 29 with a pressure booster chamber 27. In the pressure booster section 4, a pressure booster 17 is arranged to increase a fuel injection pressure relative to a system pressure. The pressure booster 17 has a stepped piston 18, the control rod 10 and the pressure booster base 16, which together define a coupler space 19. According to the invention runs in the control rod 10 of the coupling path 11, which connects the coupler chamber 19 via the located outside of the injector 1 valve means 9 with the high-pressure fuel supply 6. The valve device 9 may be formed, for example, as a solenoid valve or piezoelectric actuator or as a 2/2 or 3/2-solenoid or piezo valve, which can represent a 3/2 functionality in combination with a servo valve.

Die Steuerstange 10 greift mit ihrem, der Düsennadel 13 zugewandten Ende in einen, im Druckverstärkerboden 16 eingelassenen Hohlraum 20 ein, der über einen Verbindungspfad 21 mit einem Nadelsteuerraum 22 hydraulisch verbunden ist. Der Nadelsteuerraum 22 ist dabei von der Düsennadel 13, der diese umgebenden Düsennadelhülse 14 und dem Druckverstärkerboden 16 begrenzt. Gleichzeitig ist der Hohlraum 20 über den Kopplungspfad 11 mit dem Kopplerraum 19 verbunden, wobei der Kopplungspfad 11 im Bereich des Kopplerraums 19 Radialöffnungen 23 aufweist. In dem Hohlraum 20 kann, wie in den Fig. 2 bis 4 dargestellt, eine Steuerstangenfeder 24 vorgesehen sein, welche die Steuerstange 10 in Richtung aus dem Hohlraum 20 hinaus, hier also nach oben, vorspannt. Im Druckverstärkerboden 16 ist darüber hinaus eine Verbindungsleitung 30 vorgesehen, die beispielsweise als Bohrung ausgebildet ist und welche den Druckverstärkerraum 27 mit dem Nadelsteuerraum 22 hydraulisch verbindet. Dabei kann optional in der Verbindungsleitung 30 und/oder im Verbindungspfad 21 eine Drosseleinrichtung 31 vorgesehen sein, wobei beispielsweise die Drosseleinrichtung 31 im Verbindungspfad 21 als Ablaufdrossel und die Drosseleinrichtung 31 in der Verbindungsleitung 30 als Z-Drossel ausgebildet sein kann.The control rod 10 engages with its, the nozzle needle 13 facing the end in a, recessed in the pressure booster cavity 16 cavity 20, which is hydraulically connected via a connection path 21 with a needle control chamber 22. The needle control chamber 22 is of the nozzle needle 13, the surrounding nozzle needle sleeve 14 and the Pressure booster bottom 16 limited. At the same time, the cavity 20 is connected to the coupler space 19 via the coupling path 11, the coupling path 11 having radial openings 23 in the region of the coupler space 19. In the cavity 20 may, as in the Fig. 2 to 4 shown, a control rod spring 24 may be provided which biases the control rod 10 in the direction of the cavity 20 out, here upwards. In the pressure booster plate 16, a connecting line 30 is also provided, which is formed for example as a bore and which connects the pressure booster chamber 27 to the needle control chamber 22 hydraulically. In this case, optionally in the connecting line 30 and / or in the connecting path 21, a throttle device 31 may be provided, for example, the throttle device 31 may be formed in the connection path 21 as a drain throttle and the throttle device 31 in the connecting line 30 as a Z-throttle.

Der Stufenkolben 18 des Druckübersetzers 17 ist gemäß den Fig. 1 bis 3 von einer an dem Stufenkolben 18 hubverstellbar gelagerten Befüllhülse 25 umgeben. Gemäß der Fig. 4 wird der Stufenkolben 18 von einer festen Ringwand 26 umgeben. Die Ringwand 26 kann dabei separat oder einteilig mit dem Druckverstärkerboden 16 ausgebildet sein. Insgesamt begrenzen der Stufenkolben 18, der Druckverstärkerboden 17 und die Befüllhülse 25 oder die feste Ringwand 26 einen Druckverstärkerratim 27.The stepped piston 18 of the pressure booster 17 is according to the Fig. 1 to 3 surrounded by a stroke-adjustable on the stepped piston 18 filling sleeve 25. According to the Fig. 4 the stepped piston 18 is surrounded by a fixed annular wall 26. The annular wall 26 may be formed separately or integrally with the pressure intensifier base 16. Overall, the stepped piston 18, the pressure intensifier base 17 and the filling sleeve 25 or the fixed annular wall 26 define a pressure amplifier rim 27.

Gemäß den Fig. 1, 2 und 4 ist eine Stufenkolbenfeder 32 vorgesehen, welche sich einerseits an einem injektorkörperseitigen Anschlag 33 und andererseits am Stufenkolben 18 abstützt. Gemäß den Fig. 1 und 2 drückt dabei die Stufenkolbenfeder 32 den Stufenkolben 18 nach oben und spannt somit diesen in einem Nichtbetriebszustand gegen einen Anschlag 33', welcher als ringförmige Außenstufe an der Steuerstange 10 ausgebildet ist. Gleichzeitig wird hierdurch die Steuerstange 10 gegen eine Stirnplatte 34 gedrückt, wodurch der Kopplungspfad 11 gegenüber dem Hochdruckraum 8 abgedichtet wird.According to the Fig. 1 . 2 and 4 a stepped piston spring 32 is provided, which is supported on the one hand on an injector-side stop 33 and on the other hand on the stepped piston 18. According to the Fig. 1 and 2 pushes the stepped piston spring 32 the stepped piston 18 upwards and thus biases this in a non-operating state against a stop 33 ', which is formed as an annular outer stage on the control rod 10. At the same time thereby the control rod 10 is pressed against an end plate 34, whereby the coupling path 11 is sealed against the high-pressure chamber 8.

In dem injektorkörperseitigen Anschlag 33 ist zumindest eine axiale Durchgangsöffnung 35 vorgesehen, welche den Hochdruckraum 8 mit seinem unterhalb des Anschlages 33 gelegenen Abschnitt 8' hydraulisch verbindet.At least one axial passage opening 35 is provided in the injector body-side stop 33, which hydraulically connects the high-pressure chamber 8 with its section 8 'situated below the stop 33.

Auf einer der Stufenkolbenfeder 32 abgewandten Seite des Anschlags 33 stützt sich gemäß den Fig. 1 und 2 eine Vorspannfeder 36 ab, welche die Befüllhülse 25 gegen den Druckverstärkerboden 16 vorspannt. Bei der Ausführungsform gemäß Fig. 3 ist die Vorspannfeder 36 als Spannfeder 37 ausgebildet, welches sich einenends am Stufenkolben 18 und anderenends an der BefüHhütse 25 abstützt und letztere gegen Druckverstärkerboden 16 vorspannt.On one of the stepped piston spring 32 opposite side of the stopper 33 is supported according to the Fig. 1 and 2 a biasing spring 36, which biases the filling sleeve 25 against the pressure intensifier base 16. In the embodiment according to Fig. 3 is the Biasing spring 36 is formed as a tension spring 37, which is supported at one end on the stepped piston 18 and the other end to the BefüHhütse 25 and biases the latter against pressure booster ground 16.

Bei der Ausführungsform des Injektors 1 gemäß der Fig. 2 ist der Stufenkolben 18 als sogenannter "freifliegender Kolben" ausgebildet, welcher keinen Hubanschlag an der Steuerstange 10 aufweist. Hier wird die Steuerstange 10, ebenso wie in den Fig. 3 und 4 mittels der Steuerstangenfeder 24 gegen die Stirnplatte 34 gespannt und abgedichtet. Vorteil ist dabei, dass schnelle Druckänderungen sich direkt durch Hubänderungen des Stufenkolbens 18 ausgleichen und dadurch sichergestellt werden kann, dass der Injektor 1 nicht ungewollt, insbesondere bei schneller Systemdruckabsenkung, öffnet.In the embodiment of the injector 1 according to the Fig. 2 the stepped piston 18 is designed as a so-called "free-floating piston", which has no stroke stop on the control rod 10. Here is the control rod 10, as well as in the Fig. 3 and 4 clamped and sealed by the control rod spring 24 against the end plate 34. The advantage here is that rapid pressure changes can be compensated directly by stroke changes of the stepped piston 18 and thereby can be ensured that the injector 1 does not unintentionally, especially at rapid system pressure drop opens.

In den Darstellungen gemäß den Fig. 3 und 4 sind zwei Varianten gezeigt, bei welchen die Befüllung und Rückstellung des Druckübersetzers 17 nicht durch ein Öffnen der Befüllhülse 25, sondern durch eine geänderte Düsennadelhülse 14 sichergestellt wird. Hierbei liegt eine Dichtkante der Düsennadelhülse 14 im Vergleich zu den Ausführungsformen des Injektors 1 gemäß den Fig. 1 und 2 radial außen. Ein Dichtdurchmesser der Düsennadelhülse 14 liegt somit auf einem größeren Durchmesser, wodurch ein Öffnen erreicht wird, wenn ein Druck im Nadelsteuerraum 22 größer ist als im Düsenraum 28.In the representations according to the Fig. 3 and 4 two variants are shown in which the filling and return of the pressure booster 17 is not ensured by opening the Befüllhülse 25, but by a modified nozzle needle sleeve 14. Here, a sealing edge of the nozzle needle sleeve 14 is compared to the embodiments of the injector 1 according to the Fig. 1 and 2 radially outside. A sealing diameter of the nozzle needle sleeve 14 is thus on a larger diameter, whereby an opening is achieved when a pressure in the needle control chamber 22 is greater than in the nozzle chamber 28th

Bei der Variante gemäß der Fig. 4 ist zusätzlich eine Stufenkolbenrückstellung mittels der Stufenkolbenfeder 32 neu gelöst, um einen Bauraumvorteil realisieren zu können. Deshalb stützt sich die Stufenkolbenfeder 32 über einen Ringkragen 38 am Injektorkörper 2 ab und drückt dabei über eine Scheibe 39 auf den Stufenkolben 18 um diesen nach Beendigung des Einspritzvorgangs zurückzustellen.In the variant according to the Fig. 4 In addition, a stepped piston return by means of the stepped piston spring 32 is newly solved in order to realize a space advantage can. Therefore, the stepped piston spring 32 is supported via an annular collar 38 on the injector body 2 and presses on a disk 39 on the stepped piston 18 to reset this after completion of the injection process.

Die Funktionsweise des erfindungsgemäßen Injektors 1 kann dabei wie folgt beschrieben werden:The mode of operation of the injector 1 according to the invention can be described as follows:

Zunächst sind alle Volumina des Injektors 1 auf Systemdruckniveau. Wird durch eine Betätigung der Ventileinrichtung 9 der Druck im Kopplungspfad 11 abgesenkt, fallen der Druck im Nadelsteuerraum 22 sowie der Druck im Kopplerraum 19 ab. Zum einen erhöhen sich dadurch die in Öffnungsrichtung wirkenden Kräfte auf die Düsennadel 13, wodurch diese öffnet. Zum anderen stellt sich eine Druckverstärkung im Druckverstärkerraum 27 ein, welche aus einer Drucksenkung im Kopplerraum 19 resultiert. In Folge dessen steigt auch der Druck im Düsenraum 28, und der Injektor 1 spritzt mit einem im Vergleich zum Systemdruck höheren Einspritzdruck Kraftstoff in einen Brennraum ein.First, all volumes of the injector 1 are at system pressure level. If the pressure in the coupling path 11 is lowered by actuation of the valve device 9, the pressure in the needle control chamber 22 and the pressure in the coupler chamber 19 drop. On the one hand, this increases the forces acting in the opening direction on the nozzle needle 13, as a result of which it opens. On the other hand, there is a pressure gain in the Booster chamber 27 a, which results from a reduction in pressure in the coupler chamber 19. As a result, the pressure in the nozzle chamber 28 also increases, and the injector 1 injects fuel into a combustion chamber at a higher injection pressure than the system pressure.

Für ein Schließen des Injektors 1 wird die Ventileinrichtung 9 betätigt, insbesondere geschlossen, wodurch die Drücke im Nadelsteuerraum 22 und im Kopplerraum 19 wieder auf Systemdruck steigen. Sind die Drücke auf Systemdruckniveau zurückgekehrt, erzeugt die Stufenkolbenfeder 32 einen leichten Unterdruck im Druckverstärkerraum 27, wodurch die Befüllhülse 25 öffnet und die Rückstellung des Stufenkolbens 18 in Kombination mit einem Volumenausgleich zu einer Rückstellung des Injektors 1 in dessen Ausgangslage führt.For closing the injector 1, the valve device 9 is actuated, in particular closed, whereby the pressures in the needle control chamber 22 and in the coupler chamber 19 rise again to system pressure. Are the pressures returned to system pressure level, the stepped piston spring 32 generates a slight negative pressure in the pressure booster chamber 27, whereby the Befüllhülse 25 opens and the provision of the stepped piston 18 in combination with a volume compensation leads to a provision of the injector 1 in its initial position.

Ein besonderer Vorteil des erfindungsgemäßen Injektors 1 ist die zentrale Anordnung des Kopplungspfades 11 innerhalb der Steuerstange 10, wodurch Hochdruckbohrungen im Injektorkörper 2 entfallen können. Hierdurch kann ein hoher Einspritzdruck bei gleichzeitig moderatem Systemdruck durch lediglich eine einzige Ventileinrichtung 9 erreicht werden. Gleichzeitig können ein schnelles Schalten der Düsennadel 13 sowie eine deutlich verbesserte Mehrfacheinspritzfähigkeit aufgrund eines großen Volumens des Hochdruckraums 8 sowie geringere Druckschwankungen, die auf fehlenden Steuerleitungen resultieren, erreicht werden.A particular advantage of the injector 1 according to the invention is the central arrangement of the coupling path 11 within the control rod 10, whereby high-pressure bores in the injector 2 can be omitted. As a result, a high injection pressure can be achieved with only a single valve device 9, while the system pressure is moderate. At the same time, a rapid switching of the nozzle needle 13 and a significantly improved multiple injection capability due to a large volume of the high-pressure chamber 8 and lower pressure fluctuations resulting in missing control lines can be achieved.

Claims (11)

  1. Injector (1) for a fuel injection system of an internal combustion engine, in particular in a motor vehicle,
    - having an injector body (2) which has a pressure booster portion (4) and a needle portion (3), wherein in the needle portion (3) there is provided at least one spray hole (12),
    - having a nozzle needle (13) arranged, such that it can perform a stroke movement, in the needle portion (3), which nozzle needle serves to control an injection of fuel through the at least one spray hole (12),
    - having a pressure booster (17) for increasing a fuel injection pressure in relation to a system pressure,
    - wherein in the control rod (10) there runs a coupling path (11) which connects the coupler chamber (19) to a high-pressure fuel supply (6) via a valve device (9) situated outside or inside the injector (1), characterized in that
    - the pressure booster (17) has a stepped piston (18), a control rod (10) and a pressure booster base (16), which together delimit a coupler chamber (19).
  2. Injector according to Claim 1,
    characterized
    - in that the control rod (10) engages with its end facing toward the nozzle needle (13) into a cavity (20) formed in the pressure booster base (16),
    - in that the cavity (20) is hydraulically connected via a connecting path (21) to a needle control chamber (22) which is delimited by the nozzle needle (13), a nozzle needle sleeve (14) which surrounds said nozzle needle, and the pressure booster base (16).
  3. Injector according to Claim 2,
    characterized
    in that the cavity (20) is connected via the coupling path (11) to the coupler chamber (19).
  4. Injector according to Claim 2 or 3,
    characterized
    in that a control rod spring (24) is provided in the cavity (20), which control rod spring preloads the control rod (10) in the direction out of the cavity (20).
  5. Injector according to one of Claims 2 to 4,
    characterized
    in that a closing compression spring (15) is provided which is supported at one side on the nozzle needle sleeve (14) and at the other side on the nozzle needle (13) and which preloads the nozzle needle sleeve (14) against the pressure booster base (16) and preloads the nozzle needle (13) into its closed position.
  6. Injector according to one of Claims 1 to 5,
    characterized
    - in that the stepped piston (18) is surrounded by a filling sleeve (25), which can perform a stroke movement on said stepped piston, or by a fixed annular wall (26),
    - in that the stepped piston (18), the pressure booster base (16) and the filling sleeve (25) or the fixed annular wall (26) delimit a pressure booster chamber (27).
  7. Injector according to Claim 6,
    characterized
    - in that the nozzle needle (13) is arranged, such that it can perform a stroke movement, in a nozzle chamber (28),
    - in that the nozzle chamber (28) is hydraulically connected to the pressure booster chamber (27) via at least one passage opening (29) which is provided in the pressure booster base (16).
  8. Injector according to Claim 5 or 6,
    characterized
    - in that a connecting line (30) is provided in the pressure booster base (16), which connecting line connects the pressure booster chamber (27) to the needle control chamber (22),
    - in that a throttle device (31) is provided in the connecting line (30) between the pressure booster chamber (27) and the needle control chamber (22) and/or in the connecting path (21) between the cavity (20) and the needle control chamber (22).
  9. Injector according to one of Claims 6 to 8,
    characterized
    - in that a stepped piston spring (32) is provided which is supported at one side on a stop (33) on the injector body and at the other side on the stepped piston (18),
    - in that a preload spring (36) is provided which is supported at one end on the stop (33) and at the other end on the filling sleeve (25) and preloads the latter against the pressure booster base (16), or
    - in that a stressing spring (37) is provided which is supported at one end on the stepped piston (18) and at the other end on the filling sleeve (25) and preloads the latter against the pressure booster base (16).
  10. Injector according to Claim 7 or 8,
    characterized
    - in that the control rod (10) has an annular external step which is formed as a stop (33') for the stepped piston (18), and/or
    - in that the injector body (2) comprises a high-pressure chamber (8) in which the control rod (10), the stepped piston (18) and the filling sleeve (25) or the annular wall are arranged.
  11. Injector according to Claim 9,
    characterized
    in that the high-pressure fuel supply (6) is connected via a hydraulic line (7) directly to the high-pressure chamber (8) and indirectly via the valve device (9) to the coupling path (11) in the control rod (10).
EP08759421A 2007-05-18 2008-05-06 Injector for a fuel injection system Not-in-force EP2150696B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023384A DE102007023384A1 (en) 2007-05-18 2007-05-18 Injector for a fuel injection system
PCT/EP2008/055522 WO2008141918A1 (en) 2007-05-18 2008-05-06 Injector for a fuel injection system

Publications (2)

Publication Number Publication Date
EP2150696A1 EP2150696A1 (en) 2010-02-10
EP2150696B1 true EP2150696B1 (en) 2012-02-22

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EP08759421A Not-in-force EP2150696B1 (en) 2007-05-18 2008-05-06 Injector for a fuel injection system

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US (1) US8418941B2 (en)
EP (1) EP2150696B1 (en)
AT (1) ATE546635T1 (en)
DE (1) DE102007023384A1 (en)
WO (1) WO2008141918A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008005532A1 (en) * 2008-01-22 2009-07-23 Robert Bosch Gmbh Fuel injector whose control valve element has a support region
DE102009024596A1 (en) * 2009-06-10 2011-04-07 Continental Automotive Gmbh Injection valve with transmission unit
DE102009024595A1 (en) 2009-06-10 2011-03-24 Continental Automotive Gmbh Injection valve with transmission unit
DE102010001170A1 (en) * 2010-01-25 2011-07-28 Robert Bosch GmbH, 70469 Injection device with reduced pressure oscillations
DE102012110240A1 (en) * 2012-10-26 2014-04-30 L'orange Gmbh Fuel injection injector for internal combustion engines
DE102013013234A1 (en) * 2013-08-08 2015-02-12 Man Diesel & Turbo Se Injector for a fuel supply system of an internal combustion engine and fuel supply system

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Publication number Priority date Publication date Assignee Title
US3387790A (en) * 1967-04-11 1968-06-11 Bosch Arma Corp Fuel injection nozzle
US4367846A (en) * 1979-12-25 1983-01-11 Kawasaki Steel Corporation Fuel injection valve assembly for internal combustion engines
US4509691A (en) * 1982-07-15 1985-04-09 Lucas Industries Public Limited Company Fuel injection nozzles
JPS60192872A (en) * 1984-03-15 1985-10-01 Nippon Denso Co Ltd Accumulator type fuel injection valve
US5713520A (en) * 1995-11-27 1998-02-03 Caterpillar Inc. Fast spill device for abruptly ending injection in a hydraulically actuated fuel injector
DE10247903A1 (en) * 2002-10-14 2004-04-22 Robert Bosch Gmbh Pressure-reinforced fuel injection device for internal combustion engine has central control line acting on pressure transmission piston
DE10250722A1 (en) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Valve for controlling liquids with a pressure medium supply

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US8418941B2 (en) 2013-04-16
DE102007023384A1 (en) 2008-11-20
US20100181392A1 (en) 2010-07-22
EP2150696A1 (en) 2010-02-10
WO2008141918A1 (en) 2008-11-27
ATE546635T1 (en) 2012-03-15

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