EP2852754A1 - Injector of a fuel injection system - Google Patents

Injector of a fuel injection system

Info

Publication number
EP2852754A1
EP2852754A1 EP13718835.5A EP13718835A EP2852754A1 EP 2852754 A1 EP2852754 A1 EP 2852754A1 EP 13718835 A EP13718835 A EP 13718835A EP 2852754 A1 EP2852754 A1 EP 2852754A1
Authority
EP
European Patent Office
Prior art keywords
pressure
bore
resonator
injector
holding body
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
Application number
EP13718835.5A
Other languages
German (de)
French (fr)
Other versions
EP2852754B1 (en
Inventor
Franz Guggenbichler
Martin Bernhaupt
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2852754A1 publication Critical patent/EP2852754A1/en
Application granted granted Critical
Publication of EP2852754B1 publication Critical patent/EP2852754B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches

Definitions

  • the invention relates to an injector of a modular common rail fuel injection system with a high-pressure accumulator integrated in the injector body, the injector having an injection nozzle with a nozzle needle guided axially displaceably, surrounded by a nozzle chamber, a high-pressure bore connecting the high-pressure accumulator with the nozzle chamber, a parallel to High-pressure bore switched resonator, which communicates with the injector and is connected via a resonator choke in the high-pressure accumulator, and a
  • Injection injectors of this type are used in modular common rail systems, which are characterized in that a part of the existing storage volume in the system is present in the injector itself. Modular common-rail systems are used on particularly large engines where the individual injectors may be mounted at a considerable distance from each other. The sole use of a common rail for all injectors is not useful in such engines, as it would come due to the long lines during injection to a massive slump in Ein-injection pressure, so with prolonged injection duration, the injection rate would noticeably break.
  • each injector has its own high-pressure accumulator and thus can be used as a stand-alone module.
  • a high-pressure accumulator this is not a common line to understand, but it is a high-pressure accumulator to a pressure-resistant vessel with an inlet and outlet whose diameter in
  • a possibility of reducing pressure pulsations can be taken from WO 2007/143768 A1, wherein a resonator line connected in parallel to the high-pressure line between the injection nozzle and the high-pressure accumulator is provided, which has a resonator throttle on the high-pressure accumulator side.
  • a resonator line connected in parallel to the high-pressure line between the injection nozzle and the high-pressure accumulator is provided, which has a resonator throttle on the high-pressure accumulator side.
  • Resonator choke arranged at the entrance of the resonator in the high-pressure accumulator.
  • the resonator bore is first drilled in the form of a blind hole with a diameter of eg 3 mm from one side of the holding body ago. Thereafter, the resonator throttle is drilled, for example, with a diameter of 0.7 - 0.9 mm from the opposite side, this hole should open as central as possible in the resonator bore for reasons of high pressure resistance.
  • the axis of the resonator bore should thus coincide with the axis of the resonator choke.
  • Drilling error leads to the fact that the throttle bore does not open centrally in the resonator bore, but offset by up to 0.5 mm.
  • the invention therefore aims to realize the described resonator function in injectors with longer high-pressure wells in a structurally simple manner, without significantly impairing the high-pressure resistance.
  • the invention essentially provides, starting from an injector of the type mentioned above, that an end portion of the high-pressure bore facing the high-pressure accumulator and an end portion of the resonator bore facing the high-pressure accumulator and having the resonator throttle is designed in a separate component which is located between the holding body and the storage tube is inserted and is fixed by the screw connection of holding body and storage tube.
  • the separate component is made shorter than the holding body, so for example. is formed with an axial length of less than 100mm, preferably less than 50 mm, more preferably less than 30mm. At most, an offset occurs at the transition between the resonator bore embodied in the holding body and the end portion of the resonator bore executed in the separate component, which is less critical with regard to the high-pressure resistance.
  • the separate component is in this case held only by the axial force generated during screwing of the holding body with the storage tube and clamped between these two components without the need for further fasteners as it were.
  • a preferred embodiment of the invention provides that the holding body and the separate component are secured against rotation by means of an axial pin.
  • the separate component carries a conical sealing surface, which cooperates with a formed on a shoulder of the storage tube conical mating surface of the storage tank.
  • the separate component preferably has a planar sealing surface which cooperates with the planar end face of the holding body.
  • a preferred embodiment provides that the two end sections converge towards one another.
  • the two end sections open into a blind hole formed in the separate component.
  • the two end sections can also run parallel to one another.
  • the separate component is designed as a plate.
  • the resonator throttle is arranged at the inlet of the resonator bore into the high-pressure accumulator.
  • the resonator choke is thus formed in the separate component.
  • the resonator throttle can be designed in different lengths.
  • the resonator throttle may be relatively short, so that it extends only over a short axial section, in particular via an end section of the separate component, in particular the plate, facing the high-pressure accumulator.
  • the resonator choke can extend through the separate component, in particular the plate, so that its length corresponds to the axial extension of the separate component, in particular the plate.
  • the inventive design is particularly advantageous for injectors to bear, in which the nozzle needle for controlling its opening and closing movement of the prevailing in a fuel-pressurized control chamber pressure in the axial direction can be acted upon, wherein the control chamber with a inlet throttle having inlet channel and a flow channel having an outlet throttle is in communication and at least one control valve opening or closing the inlet or outlet channel is seen, with which the pressure in the control chamber is controlled, that the inlet throttle and the outlet throttle are formed in a throttle plate, that the control valve is formed in a valve plate and that the high-pressure bore and the resonator bore to pass through the valve plate and the throttle plate.
  • the injector is usually designed such that an injector and / or holding body accommodating the high-pressure accumulator, the valve plate, the throttle plate and the injection nozzle are held together by a nozzle retaining nut.
  • the high-pressure bore and the resonator bore extend through the holding body, the valve plate and the throttle plate and thereby connect the high-pressure accumulator with the injection nozzle.
  • the length of the resonator bore is preferably matched to the length of the high-pressure bore so that the pressure oscillations induced by the injector mutually weaken or extinguish each other.
  • the length of the resonator bore between the injection nozzle and the resonator throttle as well as the length of the high-pressure bore between the injection nozzle and the inlet of the high-pressure bore into the pressure accumulator are each preferably an integer multiple of the wavelength of the pressure oscillation induced by the injection nozzle.
  • the length of the resonator bore between the nozzle front chamber and the resonator throttle preferably corresponds substantially to the length of the high-pressure bore between the nozzle front chamber and the inlet of the high-pressure bore into the pressure accumulator.
  • FIG. 1 shows schematically a cross section of an injector equipped with a high-pressure accumulator according to the prior art
  • FIG. 2 shows a detailed representation of the confluence region of the resonator throttle in the high-pressure accumulator.
  • an injector 1 which has an injection nozzle 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high-pressure accumulator 6, wherein a bolted to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the Valve plate 4 holds together.
  • the solenoid valve 13 is closed, so that high pressure fuel from the high-pressure accumulator 6 via the high-pressure bore 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but at the valve seat of the solenoid valve thirteenth is blocked.
  • a resonator is used. This consists of a resonator bore 20, which has the same length and possibly the same diameter as the high-pressure bore 8, and a resonator throttle 21 which is attached to the memory-side end of the resonator bore 20 and connects it to the high-pressure reservoir 6.
  • FIG. 2 shows a arranged between the storage tube 25, the high-pressure accumulator 6 and the holding body 5 plate 23, which represents the present invention provided separate component.
  • the plate 23 has a conical sealing surface 24 which cooperates with a formed on a shoulder 26 of the storage tube 25 conical mating sealing surface.
  • the shoulder 26 of the storage tube 25 is connected via an annular groove-like recess 27 with a thin-walled, provided with an internal thread 28 portion 29 of the storage tube 25.
  • the plate 23 is inserted between the holding body 5 and the storage tube 25 and fixed by the screw connection of these two components.
  • the plate 23 is secured by means of at least one pin 30 against rotation.
  • a ring seal 36 provides an additional seal.
  • an end portion 32 of the high-pressure bore 8 and an end portion 33 of the resonator bore 20 is now formed.
  • the two end portions extend obliquely to the injector 34 and converge toward a high-pressure accumulator-side blind hole 35, in which both end portions 32, 33 open.
  • the end section 33 of the resonator bore 20 opens into the high-pressure accumulator 6 via the resonator throttle 21.
  • the end section 32 merges into the high-pressure bore 8 and the end section 3 into the resonator bore.

Landscapes

  • 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

In the case of an injector of a modular common-rail fuel injection system having a high-pressure accumulator (6) which is integrated into the injector body, the injector (1) comprises an injection nozzle (3) with a nozzle needle (15) which is guided axially displaceably therein and is surrounded by a nozzle chamber (19), a high-pressure bore (8) which connects the high-pressure accumulator (6) to the nozzle chamber (19), a resonator bore (20) which is connected in parallel to the high-pressure bore (8), is connected to the injection nozzle (3) and opens into the high-pressure accumulator (6) via a resonator throttle (21), and a holding body (5) which is screwed on the end side to the component, in particular common rail (25), which forms the high-pressure accumulator (6), and through which holding body (5) the high-pressure bore (8) and the resonator bore (20) run. An end section (32), facing the high-pressure accumulator (6), of the high-pressure bore (8) and an end section (33), facing the high-pressure accumulator (6) and having the resonator throttle (21), of the resonator bore (20) are configured in a separate component (23) which is inserted between the holding body (5) and the common rail (25) and is fixed by the screw connection of holding body (5) and common rail (25).

Description

Titel  title
Injektor eines Kraftstoffeinspritzsystems Injector of a fuel injection system
Beschreibung description
Die Erfindung betrifft einen Injektor eines modularen Common- Rail-Kraftstoffein- spritzsystems mit einem im Injektorkörper integrierten Hochdruckspeicher, wobei der Injektor eine Einspritzdüse mit darin axial verschieblich geführter, von einem Düsenraum umgebener Düsennadel, eine den Hochdruckspeicher mit dem Düsenraum verbindende Hochdruckbohrung, eine parallel zur Hochdruckbohrung geschaltene Resonatorbohrung, die mit der Einspritzdüse in Verbindung steht und über eine Resonatordrossel in den Hochdruckspeicher mündet, und einenThe invention relates to an injector of a modular common rail fuel injection system with a high-pressure accumulator integrated in the injector body, the injector having an injection nozzle with a nozzle needle guided axially displaceably, surrounded by a nozzle chamber, a high-pressure bore connecting the high-pressure accumulator with the nozzle chamber, a parallel to High-pressure bore switched resonator, which communicates with the injector and is connected via a resonator choke in the high-pressure accumulator, and a
Haltekörper aufweist, der stirnseitig mit dem den Hochdruckspeicher bildenden Bauteil, insbesondere einem Speicherrohr verschraubt ist und durch den die Hochdruckbohrung und die Resonatorbohrung verlaufen. Einspritzinjektoren dieser Art werden in modularen Common- Rail-Systemen verwendet, die dadurch gekennzeichnet sind, dass ein Teil des im System vorhandenen Speichervolumens im Injektor selbst vorhanden ist. Modulare Common- Rail-Systeme kommen bei besonders großen Motoren zum Einsatz, bei welchen die einzelnen Injektoren unter Umständen in erheblichem Abstand voneinander angebracht sind. Die alleinige Verwendung eines gemeinsamen Rails für alle Injektoren ist bei solchen Motoren nicht sinnvoll, da es aufgrund der langen Leitungen während der Einspritzung zu einem massiven Einbruch im Ein-spritzdruck kommen würde, sodass bei längerer Spritzdauer die Einspritzrate merklich einbrechen würde. Bei solchen Motoren ist es daher vorgesehen, einen Hochdruck- Speicher im Inneren eines jeden Injektors anzuordnen. Eine solche Bauweise wird als modularer Aufbau bezeichnet, da jeder einzelne Injektor über seinen eigenen Hochdruckspeicher verfügt und somit als eigenständiges Modul eingesetzt werden kann. Unter einem Hochdruckspeicher ist hierbei nicht eine gewöhnliche Leitung zu verstehen, sondern es handelt sich bei einem Hochdruckspeicher um ein druckfestes Gefäß mit einer Zu- bzw. Ableitung, dessen Durchmesser imHolding body which is frontally screwed to the high-pressure accumulator forming member, in particular a storage tube and through which the high-pressure bore and the resonator bore. Injection injectors of this type are used in modular common rail systems, which are characterized in that a part of the existing storage volume in the system is present in the injector itself. Modular common-rail systems are used on particularly large engines where the individual injectors may be mounted at a considerable distance from each other. The sole use of a common rail for all injectors is not useful in such engines, as it would come due to the long lines during injection to a massive slump in Ein-injection pressure, so with prolonged injection duration, the injection rate would noticeably break. In such engines, it is therefore intended to arrange a high-pressure accumulator inside each injector. Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module. Under a high-pressure accumulator this is not a common line to understand, but it is a high-pressure accumulator to a pressure-resistant vessel with an inlet and outlet whose diameter in
Vergleich zu den Hochdruckleitungen deutlich vergrößert ist, damit aus dem Hochdruckspeicher eine gewisse Einspritzmenge abgegeben werden kann, ohne dass es zu einem sofortigen Druckabfall kommt. Compared to the high pressure lines is significantly increased, so from the High-pressure accumulator can be discharged a certain amount of injection, without causing an immediate pressure drop.
In einem Common- Rail-System werden elektronisch gesteuerte Einspritzinjektoren zum Einspritzen des Kraftstoffs in den Motorbrennraum verwendet. Die in diesen Injektoren verwendeten Servoventile bewirken ein sehr schnelles Schließen der Einspritzdüse. Beim Schließen der Einspritzdüse läuft der Kraftstoff gegen ein geschlossenes Leitungsende, wobei auf Grund der Trägheit des Kraftstoffes der Druck vor der Einspritzdüse deutlich ansteigt. Diese Druckspitze läuft in der Folge in der Hochdruckbohrung zwischen Einspritzdüse und dem Hochdruckspeicher hin und her, wobei am Düsensitz starke Druckpulsationen entstehen, die hier zu starkem Verschleiß führen. Die dabei auftretenden Druckspitzen liegen in ungünstigen Fällen um bis zu 500 bar über dem Raildruck. In a common rail system, electronically controlled injection injectors are used to inject the fuel into the engine combustion chamber. The servo valves used in these injectors cause a very fast closing of the injector. When closing the injector, the fuel runs against a closed line end, wherein due to the inertia of the fuel, the pressure in front of the injector increases significantly. As a result, this pressure peak reciprocates in the high-pressure bore between the injection nozzle and the high-pressure accumulator, with strong pressure pulsations occurring at the nozzle seat, which lead to excessive wear here. The resulting pressure peaks are in unfavorable cases by up to 500 bar above the rail pressure.
Eine Möglichkeit der Reduktion von Druckpulsationen ist der WO 2007/143768 AI zu entnehmen, wobei eine parallel zur Hochdruckleitung zwischen Einspritzdüse und Hochdruckspeicher geschaltene Resonatorleitung vorgesehen ist, die hoch- druckspeicherseitig eine Resonatordrossel aufweist. Bevorzugt ist die A possibility of reducing pressure pulsations can be taken from WO 2007/143768 A1, wherein a resonator line connected in parallel to the high-pressure line between the injection nozzle and the high-pressure accumulator is provided, which has a resonator throttle on the high-pressure accumulator side. Preferably, the
Resonatordrossel am Eintritt der Resonatorleitung in den Hochdruckspeicher angeordnet. Resonator choke arranged at the entrance of the resonator in the high-pressure accumulator.
Bei der Fertigung der Resonatorbohrung samt Resonatordrossel tritt das Problem auf, dass es insbesondere bei Injektoren mit längerer Resonatorbohrung zu einem Bohrungsversatz kommt, der die Hochdruckfestigkeit sehr reduziert. Der Bohrungsversatz kommt dabei wie folgt zustande. Im Zuge der Fertigung wird zuerst die Resonatorbohrung in Form einer Sacklochbohrung mit einem Durchmesser von z.B. 3mm von der einen Seite des Haltekörpers her gebohrt. Danach wird von der gegenüberliegenden Seite her die Resonatordrossel z.B. mit einem Durchmesser von 0,7 - 0,9 mm gebohrt, wobei diese Bohrung aus Gründen der Hochdruckfestigkeit möglichst zentral in die Resonatorbohrung einmünden soll. Die Achse der Resonatorbohrung soll somit mit der Achse der Resonatordrossel zusammenfallen. Die hierfür erforderliche fertigungstechnische Genauigkeit ist in der Praxis jedoch nicht realisierbar. Zum einen tritt beim Ansetzen des Bohrwerkzeuges immer ein Anbohrfehler auf. Zum anderen kommt es bei längeren Bohrungen meist zu einer Abweichung von der gewünschten axialen Bohrungsrichtung, was dazu führt, dass das eine Ende der Bohrung gegenüber dem anderen Ende der Bohrung um bis zu 2 % axial versetzt ist. Gemeinsam mit dem When manufacturing the resonator bore including the resonator throttle, the problem arises that, especially with injectors with a longer resonator bore, a bore offset occurs which greatly reduces the high-pressure resistance. The hole offset is achieved as follows. In the course of production, the resonator bore is first drilled in the form of a blind hole with a diameter of eg 3 mm from one side of the holding body ago. Thereafter, the resonator throttle is drilled, for example, with a diameter of 0.7 - 0.9 mm from the opposite side, this hole should open as central as possible in the resonator bore for reasons of high pressure resistance. The axis of the resonator bore should thus coincide with the axis of the resonator choke. However, the required manufacturing accuracy is not feasible in practice. On the one hand, a tapping error always occurs when applying the drilling tool. On the other hand, it usually comes with longer holes to a deviation from the desired axial bore direction, which results in that one end of the bore relative to the other End of the hole is offset by up to 2% axially. Together with the
Anbohrfehler führt dies dazu, dass die Drosselbohrung nicht zentral in die Resonatorbohrung mündet, sondern um bis zu 0,5 mm versetzt. Drilling error leads to the fact that the throttle bore does not open centrally in the resonator bore, but offset by up to 0.5 mm.
Die Erfindung zielt daher darauf ab, die beschriebene Resonatorfunktion auch bei Injektoren mit längeren Hochdruckbohrungen in baulich einfacher Weise zu realisieren, ohne die Hochdruckfestigkeit wesentlich zu verschlechtern. The invention therefore aims to realize the described resonator function in injectors with longer high-pressure wells in a structurally simple manner, without significantly impairing the high-pressure resistance.
Zur Lösung dieser Aufgabe sieht die Erfindung ausgehend von einem Injektor der eingangs genannten Art im Wesentlichen vor, dass ein dem Hochdruckspeicher zugewandter Endabschnitt der Hochdruckbohrung und ein dem Hochdruckspeicher zugewandter und die Resonatordrossel aufweisender Endabschnitt der Resonatorbohrung in einem gesonderten Bauteil ausgeführt ist, welches zwischen dem Haltekörper und dem Speicherrohr eingelegt ist und durch die Ver- schraubung von Haltekörper und Speicherrohr fixiert ist. Durch diese Maßnahme wird erreicht, dass der fertigungstechnisch unvermeidbare Bohrungsversatz keinen Einfluss auf den Übergang der Resonatorbohrung in die Resonatordrossel hat. Dieser Übergang ist nämlich in dem gesonderten Bauteil angeordnet, bei dem das Problem des Bohrungsversatzes auf Grund der geringeren axialen Länge keine merkbare Auswirkung auf die Hochdruckfestigkeit hat. Dies gilt insbesondere dann, wenn das gesonderte Bauteil kürzer als der Haltekörper ausgeführt ist, also z.B. mit einer axialen Länge von weniger als 100mm, bevorzugt weniger als 50 mm, besonders bevorzugt weniger als 30mm ausgebildet ist. Ein Versatz tritt allenfalls am Übergang zwischen der im Haltekörper ausgeführten Resonatorbohrung und dem im gesonderten Bauteil ausgeführten Endabschnitt der Resonatorbohrung auf, was hinsichtlich der Hochdruckfestigkeit jedoch weniger kritisch ist. To achieve this object, the invention essentially provides, starting from an injector of the type mentioned above, that an end portion of the high-pressure bore facing the high-pressure accumulator and an end portion of the resonator bore facing the high-pressure accumulator and having the resonator throttle is designed in a separate component which is located between the holding body and the storage tube is inserted and is fixed by the screw connection of holding body and storage tube. By means of this measure it is achieved that the production-technically unavoidable bore offset has no influence on the transition of the resonator bore into the resonator throttle. This transition is in fact arranged in the separate component, in which the problem of the hole offset due to the smaller axial length has no noticeable effect on the high pressure resistance. This is especially true when the separate component is made shorter than the holding body, so for example. is formed with an axial length of less than 100mm, preferably less than 50 mm, more preferably less than 30mm. At most, an offset occurs at the transition between the resonator bore embodied in the holding body and the end portion of the resonator bore executed in the separate component, which is less critical with regard to the high-pressure resistance.
Das gesonderte Bauteil wird hierbei lediglich durch die beim Verschrauben des Haltkörpers mit dem Speicherrohr erzeugte axiale Kraft gehalten und zwischen diesen beiden Bauteilen ohne die Notwendigkeit weiterer Befestigungsmittel gleichsam eingeklemmt. The separate component is in this case held only by the axial force generated during screwing of the holding body with the storage tube and clamped between these two components without the need for further fasteners as it were.
Damit das beim Verschrauben des Haltekörpers mit dem Speicherrohr auf das gesonderte Bauteil wirkende Drehmoment nicht zu einem Verdrehen des gesonderten Bauteils führt, sieht eine bevorzugte Weiterbildung der Erfindung vor, dass der Haltekörper und das gesonderte Bauteil mittels eines axialen Stiftes verdrehgesichert sind. In order that the torque acting on the separate component during screwing of the holding body does not lead to a rotation of the separate component, a preferred embodiment of the invention provides that the holding body and the separate component are secured against rotation by means of an axial pin.
Um einerseits ein sicheres Halten des gesonderten Bauteils zu gewährleisten und andererseits eine hochdruckdichte Verbindung zu schaffen, ist bevorzugt vorgesehen, dass das gesonderte Bauteil eine kegelige Dichtfläche trägt, die mit einer an einem Absatz des Speicherrohrs ausgebildeten kegeligen Gegendicht- fläche des Speicherrohrs zusammenwirkt. An der dem Haltekörper zugewandten Stirnseite weist das gesonderte Bauteil bevorzugt eine plane Dichtfläche auf, die mit der planen Stirnseite des Haltekörpers zusammenwirkt. On the one hand to ensure a secure holding of the separate component and on the other hand to create a high-pressure-tight connection, it is preferably provided that the separate component carries a conical sealing surface, which cooperates with a formed on a shoulder of the storage tube conical mating surface of the storage tank. At the end face facing the holding body, the separate component preferably has a planar sealing surface which cooperates with the planar end face of the holding body.
Eine bevorzugte Ausbildung sieht vor, dass die beiden Endabschnitte zueinander konvergieren. Insbesondere münden die beiden Endabschnitte in einem im gesonderten Bauteil ausgebildeten Sackloch. Alternativ können die beiden Endab- schnitte jedoch auch parallel zueinander verlaufen. A preferred embodiment provides that the two end sections converge towards one another. In particular, the two end sections open into a blind hole formed in the separate component. Alternatively, however, the two end sections can also run parallel to one another.
Bevorzugt ist das gesonderte Bauteil als Platte ausgebildet. Preferably, the separate component is designed as a plate.
Bevorzugt ist vorgesehen, dass die Resonatordrossel am Eintritt der Resonator- bohrung in den Hochdruckspeicher angeordnet ist. Die Resonatordrossel ist somit in dem gesonderten Bauteil ausgebildet. Dabei kann die Resonatordrossel in verschiedenen Längen ausgeführt sein. Beispielsweise kann die Resonatordrossel relativ kurz ausgebildet sein, sodass sie sich lediglich über einen kurzen axialen Teilabschnitt, insbesondere über einen dem Hochdruckspeicher zugewand- ten Endabschnitt des gesonderten Bauteils, insbesondere der Platte erstreckt. Alternativ kann sich die Resonatordrossel durch das gesonderte Bauteil, insbesondere die Platte hindurch erstrecken, sodass ihre Länge der axialen Erstreckung des gesonderten Bauteils, insbesondere der Platte entspricht. Die erfindungsgemäße Ausbildung kommt besonders vorteilhaft bei Injektoren zum Tragen, bei denen die Düsennadel zur Steuerung ihrer Öffnungs- und Schließbewegung von dem in einem mit Kraftstoff unter Druck speisbaren Steuerraum herrschenden Druck in axialer Richtung beaufschlagbar ist, wobei der Steuerraum mit einem eine Zulaufdrossel aufweisenden Zulaufkanal und einem eine Ablaufdrossel aufweisenden Ablaufkanal in Verbindung steht und wenigstens ein den Zu- oder Ablaufkanal öffnendes oder schließendes Steuerventil vor- gesehen ist, mit dem der Druck im Steuerraum gesteuert wird, dass die Zulaufdrossel und die Ablaufdrossel in einer Drosselplatte ausgebildet sind, dass das Steuerventil in einer Ventilplatte ausgebildet ist und dass die Hochdruckbohrung und die Resonatorbohrung die Ventilplatte und die Drosselplatte durchsetzen. Der Injektor ist hierbei meist so ausgebildet, dass ein den Hochdruckspeicher beherbergender Injektor- und/oder Haltekörper, die Ventilplatte, die Drosselplatte und die Einspritzdüse von einer Düsenspannmutter zusammengehalten werden. Die Hochdruckbohrung und die Resonatorbohrung erstrecken sich dabei durch den Haltekörper, die Ventilplatte und die Drosselplatte und verbinden dadurch den Hochdruckspeicher mit der Einspritzdüse. It is preferably provided that the resonator throttle is arranged at the inlet of the resonator bore into the high-pressure accumulator. The resonator choke is thus formed in the separate component. In this case, the resonator throttle can be designed in different lengths. For example, the resonator throttle may be relatively short, so that it extends only over a short axial section, in particular via an end section of the separate component, in particular the plate, facing the high-pressure accumulator. Alternatively, the resonator choke can extend through the separate component, in particular the plate, so that its length corresponds to the axial extension of the separate component, in particular the plate. The inventive design is particularly advantageous for injectors to bear, in which the nozzle needle for controlling its opening and closing movement of the prevailing in a fuel-pressurized control chamber pressure in the axial direction can be acted upon, wherein the control chamber with a inlet throttle having inlet channel and a flow channel having an outlet throttle is in communication and at least one control valve opening or closing the inlet or outlet channel is seen, with which the pressure in the control chamber is controlled, that the inlet throttle and the outlet throttle are formed in a throttle plate, that the control valve is formed in a valve plate and that the high-pressure bore and the resonator bore to pass through the valve plate and the throttle plate. In this case, the injector is usually designed such that an injector and / or holding body accommodating the high-pressure accumulator, the valve plate, the throttle plate and the injection nozzle are held together by a nozzle retaining nut. The high-pressure bore and the resonator bore extend through the holding body, the valve plate and the throttle plate and thereby connect the high-pressure accumulator with the injection nozzle.
Bevorzugt ist die Länge der Resonatorbohrung auf die Länge der Hochdruckbohrung abgestimmt, sodass sich die vom Injektor induzierten Druckschwingungen gegenseitig ab-schwächen oder auslöschen. The length of the resonator bore is preferably matched to the length of the high-pressure bore so that the pressure oscillations induced by the injector mutually weaken or extinguish each other.
Bevorzugt ist die Länge der Resonatorbohrung zwischen der Einspritzdüse und der Resonatordrossel sowie die Länge der Hochdruckbohrung zwischen der Einspritzdüse und dem Eintritt der Hochdruckbohrung in den Druckspeicher jeweils ein ganzzahliges Vielfaches der Wellenlänge der von der Einspritzdüse induzierten Druckschwingung. The length of the resonator bore between the injection nozzle and the resonator throttle as well as the length of the high-pressure bore between the injection nozzle and the inlet of the high-pressure bore into the pressure accumulator are each preferably an integer multiple of the wavelength of the pressure oscillation induced by the injection nozzle.
Bevorzugt entspricht die Länge der Resonatorbohrung zwischen dem Düsenvorraum und der Resonatordrossel im Wesentlichen der Länge der Hochdruckbohrung zwischen dem Düsenvorraum und dem Eintritt der Hochdruckbohrung in den Druckspeicher. The length of the resonator bore between the nozzle front chamber and the resonator throttle preferably corresponds substantially to the length of the high-pressure bore between the nozzle front chamber and the inlet of the high-pressure bore into the pressure accumulator.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. In dieser zeigen Fig. 1 schematisch einen Querschnitt eines mit einem Hochdruckspeicher ausgestatteten Injektors gemäß Stand der Technik und Fig. 2 eine Detaildarstellung des Einmündungsbereichs der Resonatordrossel in den Hochdruckspeicher. The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. 1 shows schematically a cross section of an injector equipped with a high-pressure accumulator according to the prior art, and FIG. 2 shows a detailed representation of the confluence region of the resonator throttle in the high-pressure accumulator.
In Fig. 1 ist ein Injektor 1 dargestellt, der eine Einspritzdüse 2, eine Drosselplatte 3, eine Ventilplatte 4, einen Haltekörper 5 und einen Hochdruckspeicher 6 aufweist, wobei eine mit dem Haltekörper 5 verschraubte Düsenspannmutter 7 die Einspritzdüse 2, die Drosselplatte 3 und die Ventilplatte 4 zusammenhält. Im Ru- hezustand ist das Magnetventil 13 geschlossen, sodass Hochdruckkraftstoff aus dem Hochdruckspeicher 6 über die Hochdruckbohrung 8, die Querverbindung 9 und die Zulaufdrossel 10 in den Steuerraum 11 der Einspritzdüse 2 strömt, der Abfluss aus dem Steuerraum 11 über die Ablaufdrossel 12 aber am Ventilsitz des Magnetventils 13 blockiert ist. Der im Steuerraum 11 anliegende Systemdruck drückt gemeinsam mit der Kraft der Düsenfeder 14 die Düsennadel 15 in den Düsennadelsitz 16, sodass die Spritzlöcher 17 verschlossen sind. Wird das Magnetventil 13 betätigt, gibt es den Durchfluss über den Magnetventilsitz frei, und Kraftstoff strömt aus dem Steuerraum 11 durch die Ablaufdrossel 12, den Magnetventilankerraum und die Niederdruckbohrung 18 zurück in den nicht dargestellten Kraftstofftank. Es stellt sich ein durch die Strömungsquerschnitte von Zulaufdrossel 10 und Ablaufdrossel 12 definierter Gleichgewichtsdruck im Steuerraum 11 ein, der so gering ist, dass der im Düsenraum 19 anliegende Systemdruck die im Düsenkörper längs verschieblich geführte Düsennadel 15 zu öffnen vermag, sodass die Spritzlöcher 17 freigegeben werden und eine Einspritzung erfolgt. In Fig. 1, an injector 1 is shown, which has an injection nozzle 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high-pressure accumulator 6, wherein a bolted to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the Valve plate 4 holds together. In the when the solenoid valve 13 is closed, so that high pressure fuel from the high-pressure accumulator 6 via the high-pressure bore 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but at the valve seat of the solenoid valve thirteenth is blocked. The voltage applied in the control chamber 11 system pressure presses together with the force of the nozzle spring 14, the nozzle needle 15 in the nozzle needle seat 16, so that the injection holes 17 are closed. If the solenoid valve 13 is actuated, it releases the flow through the solenoid valve seat, and fuel flows from the control chamber 11 through the outlet throttle 12, the solenoid valve armature chamber and the low-pressure bore 18 back into the fuel tank, not shown. A equilibrium pressure defined in the control chamber 11 by the flow cross-sections of inlet throttle 10 and outlet throttle 12 is so small that the system pressure applied in the nozzle chamber 19 is able to open the nozzle needle 15, which is displaceable longitudinally in the nozzle body, so that the spray holes 17 are released and an injection takes place.
Aufgrund der Massenträgheit des Kraftstoffs in Speicher 6, Hochdruckbohrung 8 und Düsenraum 19 kommt es direkt nach dem Schließen der Düsennadel 15 zu starken Druckschwingungen am Düsensitz 16, da der fließende Kraftstoff in sehr kurzer Zeit abgebremst werden muss. Zur Reduktion der Druckschwingungen kommt ein Resonator zum Einsatz. Dieser besteht aus einer Resonatorbohrung 20, welche die gleiche Länge und ggf. den gleichen Durchmesser wie die Hochdruckbohrung 8 aufweist, sowie einer Resonatordrossel 21, die am speicherseiti- gen Ende der Resonatorbohrung 20 angebracht ist und diese mit dem Hochdruckspeicher 6 verbindet. Beim Schließen des Magnetventils 13 pflanzt sich der am Düsensitz 16 entstehende Druckpuls über den Düsenraum 19 in die Hochdruckbohrung 8 und die Resonatorbohrung 20 fort. Am Ende der Hochdruckbohrung 8 erfolgt eine Reflexion des Druckpulses am offenen Ende am Übergang in den Hochdruckspeicher 6. Gleichzeitig wird der in der Resonatorbohrung 20 laufende Druckpuls am geschlossenen Ende an der Resonatordrossel 21 reflektiert. Die beiden reflektierten Druckpulse sind aufgrund der unterschiedlichen Reflexionsart (offenes bzw. geschlossenes Ende) um 180° phasenverschoben, so dass sie sich beim Aufeinandertreffen im Düsenraum 19 auslöschen. Dadurch kommt es zu keinen weiteren Druckpulsen am Düsensitz 16, sodass hier deutlich weniger Verschleiß auftritt. Die Zuführung des Hochdruckkraftstoffs von einer nicht näher dargestellten Hochdruckpumpe in den Injektor 1, kann über einen an der Oberseite des Injektors 1 angeordneten Hochdruckanschluss 22 erfolgen (Topfeed-Injektor). Due to the inertia of the fuel in memory 6, high-pressure bore 8 and nozzle chamber 19, there are strong pressure oscillations on the nozzle seat 16 directly after the closing of the nozzle needle 15, since the flowing fuel has to be braked in a very short time. To reduce the pressure oscillations, a resonator is used. This consists of a resonator bore 20, which has the same length and possibly the same diameter as the high-pressure bore 8, and a resonator throttle 21 which is attached to the memory-side end of the resonator bore 20 and connects it to the high-pressure reservoir 6. When the solenoid valve 13 is closed, the pressure pulse generated at the nozzle seat 16 is propagated via the nozzle chamber 19 into the high-pressure bore 8 and the resonator bore 20. At the end of the high-pressure bore 8, a reflection of the pressure pulse at the open end takes place at the transition into the high-pressure accumulator 6. At the same time, the pressure pulse running in the resonator bore 20 is reflected at the closed end on the resonator throttle 21. The two reflected pressure pulses are phase-shifted by 180 ° due to the different reflection mode (open or closed end), so that they cancel each other out in the nozzle chamber 19 when they meet. As a result, there are no further pressure pulses on the nozzle seat 16, so that significantly less wear occurs here. The supply of high-pressure fuel from a high-pressure pump not shown in the injector 1, via a arranged on the top of the injector 1 high-pressure port 22 (topfeed injector).
In der Detaildarstellung gemäß Fig. 2 ist die erfindungsgemäße Ausbildung dargestellt, die mit Ausnahme der in Fig. 2 dargestellten Details identisch ist wie in Fig. 1, so dass für gleiche Bauteile die in Fig. 1 verwendeten Bezugszeichen beibehalten wurden. Fig. 2 zeigt eine zwischen dem Speicherrohr 25, dem Hochdruckspeicher 6 und dem Haltekörper 5 angeordnete Platte 23, die das erfindungsgemäß vorgesehene gesonderte Bauteil darstellt. Die Platte 23 weist eine kegelige Dichtfläche 24 auf, die mit einer an einem Absatz 26 des Speicherrohrs 25 ausgebildeten kegeligen Gegendichtfläche zusammenwirkt. Der Absatz 26 des Speicherrohrs 25 ist über eine ringnutartige Ausnehmung 27 mit einem dünnwandigeren, mit einem Innengewinde 28 versehenen Abschnitt 29 des Speicherrohrs 25 verbunden. Die Platte 23 wird zwischen den Haltekörper 5 und das Speicherrohr 25 eingelegt und durch die Verschraubung dieser beiden Bauteile fixiert. Dabei wird die Platte 23 mittels wenigstens eines Stiftes 30 gegen Verdrehen gesichert. Die Abdichtung zum Haltekörper 5 erfolgt über eine Flachdichtstelle 31, welche von einer an der dem Haltekörper 5 zugewandten Stirnseite ausgebildeten Plandichtfläche der Platte 23 ausgebildet wird, welche mit der planen Stirnseite des Haltekörpers 5 zusammenwirkt. Eine Ringdichtung 36 sorgt für eine zusätzliche Abdichtung. In the detailed illustration according to FIG. 2, the embodiment according to the invention is shown which, with the exception of the details shown in FIG. 2, is identical to that in FIG. 1, so that the same reference numerals have been retained for the same components. Fig. 2 shows a arranged between the storage tube 25, the high-pressure accumulator 6 and the holding body 5 plate 23, which represents the present invention provided separate component. The plate 23 has a conical sealing surface 24 which cooperates with a formed on a shoulder 26 of the storage tube 25 conical mating sealing surface. The shoulder 26 of the storage tube 25 is connected via an annular groove-like recess 27 with a thin-walled, provided with an internal thread 28 portion 29 of the storage tube 25. The plate 23 is inserted between the holding body 5 and the storage tube 25 and fixed by the screw connection of these two components. The plate 23 is secured by means of at least one pin 30 against rotation. The sealing to the holding body 5 via a flat sealing point 31, which is formed by a formed on the holding body 5 facing end face plane sealing surface of the plate 23, which cooperates with the flat end face of the holding body 5. A ring seal 36 provides an additional seal.
In der Platte 23 ist nun ein Endabschnitt 32 der Hochdruckbohrung 8 und ein Endabschnitt 33 der Resonatorbohrung 20 ausgebildet. Die beiden Endabschnitte verlaufen schräg zur Injektorachse 34 und konvergieren in Richtung zu einem hochdruckspeicherseitigen Sackloch 35, in das beide Endabschnitte 32, 33 münden. Der Endabschnitt 33 der Resonatorbohrung 20 mündet hierbei über die Resonatordrossel 21 in den Hochdruckspeicher 6. An der Flachdichtstelle 31 geht der Endabschnitt 32 in die Hochdruckbohrung 8 und der Endabschnitt 3 in die Resonatorbohrung über. In the plate 23, an end portion 32 of the high-pressure bore 8 and an end portion 33 of the resonator bore 20 is now formed. The two end portions extend obliquely to the injector 34 and converge toward a high-pressure accumulator-side blind hole 35, in which both end portions 32, 33 open. In this case, the end section 33 of the resonator bore 20 opens into the high-pressure accumulator 6 via the resonator throttle 21. At the flat sealing point 31, the end section 32 merges into the high-pressure bore 8 and the end section 3 into the resonator bore.

Claims

Patentansprüche claims
1. Injektor eines modularen Common- Rail-Kraftstoffeinspritzsystems mit einem im Injektorkörper integrierten Hochdruckspeicher, wobei der Injektor eine Einspritzdüse mit darin axial verschieblich geführter, von einem Düsenraum umgebener Düsennadel, eine den Hochdruckspeicher mit dem Düsenraum verbindende Hochdruckbohrung, eine parallel zur Hochdruckbohrung geschaltene Resonatorbohrung, die mit der Einspritzdüse in Verbindung steht und über eine Resonatordrossel in den Hochdruckspeicher mündet, und einen Haltekörper aufweist, der stirnseitig mit dem den Hochdruckspeicher bildenden Bauteil, insbesondere Speicherrohr verschraubt ist und durch den die Hochdruckbohrung und die Resonatorbohrung verlaufen, dadurch gekennzeichnet, dass ein dem Hochdruckspeicher (6) zugewandter Endabschnitt (32) der Hochdruckbohrung (8) und ein dem Hochdruckspeicher (6) zugewandter und die Resonatordrossel (21) aufweisender Endabschnitt (33) der Resonatorbohrung (20) in einem gesonderten Bauteil (23) ausgeführt ist, welches zwischen dem Haltekörper (5) und dem Speicherrohr (25) eingelegt ist und durch die Verschraubung von Haltekörper (5) und Speicherrohr (25) fixiert ist. 1. Injector of a modular common rail fuel injection system with a high-pressure accumulator integrated in the injector body, wherein the injector has an injection nozzle with axially displaceably guided, surrounded by a nozzle chamber nozzle needle, the high-pressure accumulator with the nozzle chamber connecting high-pressure bore, a parallel to the high pressure bore resonator bore, which is in communication with the injection nozzle and opens into the high-pressure accumulator via a resonator throttle, and has a holding body which is screwed to the front side of the component forming the high-pressure accumulator, in particular storage tube and through which the high-pressure bore and the resonator bore extend, characterized in that a High-pressure accumulator (6) facing the end portion (32) of the high-pressure bore (8) and a high-pressure accumulator (6) facing and the resonator (21) exhibiting end portion (33) of the resonator bore (20) in a separate component (23) is executed, which between the holding body (5) and the storage tube (25) is inserted and fixed by the screwing of the holding body (5) and storage tube (25).
2. Injektor nach Anspruch 1, dadurch gekennzeichnet, dass das gesonderte Bauteil (23) eine kegelige Dichtfläche (24) trägt, die mit einer an einem Absatz (26) des Speicherrohrs (25) ausgebildeten kegeligen Gegendichtfläche des Speicherrohrs (25) zusammenwirkt. 2. An injector according to claim 1, characterized in that the separate component (23) carries a conical sealing surface (24) which cooperates with a on a shoulder (26) of the storage tube (25) formed conical mating surface of the storage tube (25).
3. Injektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das gesonderte Bauteil (23) an der dem Haltekörper (5) zugewandten Stirnseite eine plane Dichtfläche aufweist, die mit der planen Stirnseite des Haltekörpers (5) zusammenwirkt. 3. An injector according to claim 1 or 2, characterized in that the separate component (23) on the said holding body (5) facing end face has a planar sealing surface which cooperates with the flat end face of the holding body (5).
4. Injektor nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass der Haltekörper (5) und das gesonderte Bauteil (23) mittels eines axialen Stiftes (30) verdrehgesichert sind. 4. An injector according to claim 1, 2 or 3, characterized in that the holding body (5) and the separate component (23) by means of an axial pin (30) are secured against rotation.
5. Injektor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die beiden Endabschnitte (32,33) zueinander konvergieren. 5. Injector according to one of claims 1 to 4, characterized in that the two end portions (32,33) converge to each other.
6. Injektor nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die beiden Endabschnitte (32,33) in ein im gesonderten Bauteil (23) ausgebildetes Sackloch (35) münden. 6. Injector according to one of claims 1 to 5, characterized in that the two end portions (32,33) in a separate component (23) formed blind hole (35) open.
7. Injektor nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Resonatordrossel (21) sich durch das gesonderte Bauteil (23) hindurch erstreckt. 7. Injector according to one of claims 1 to 6, characterized in that the resonator throttle (21) extends through the separate component (23) therethrough.
8. Injektor nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Düsennadel (15) zur Steuerung ihrer Öffnungs- und Schließbewegung von dem in einem mit Kraftstoff unter Druck speisbaren Steuerraum (11) herrschenden Druck in axialer Richtung beaufschlagbar ist, wobei der Steuerraum (11) mit einem eine Zulaufdrossel (10) aufweisenden Zulaufkanal (9) und einem eine Ablaufdrossel (12) aufweisenden Ablaufkanal in Verbindung steht und wenigstens ein den Zu- oder Ablaufkanal öffnendes oder schließendes Steuerventil (13) vorgesehen ist, mit dem der Druck im Steuerraum (11) gesteuert wird. 8. Injector according to one of claims 1 to 7, characterized in that the nozzle needle (15) for controlling its opening and closing movement of the pressure prevailing in a fuel under pressure control chamber (11) prevailing pressure in the axial direction can be acted upon, wherein the Control chamber (11) with an inlet throttle (10) having inlet channel (9) and an outlet throttle (12) having flow channel in communication and at least one inlet or outlet channel opening or closing control valve (13) is provided with the pressure is controlled in the control room (11).
EP13718835.5A 2012-05-22 2013-04-24 Injector of a fuel injection system Not-in-force EP2852754B1 (en)

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