EP2394048B1 - Injector assembly for an injection valve - Google Patents

Injector assembly for an injection valve Download PDF

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Publication number
EP2394048B1
EP2394048B1 EP10701021.7A EP10701021A EP2394048B1 EP 2394048 B1 EP2394048 B1 EP 2394048B1 EP 10701021 A EP10701021 A EP 10701021A EP 2394048 B1 EP2394048 B1 EP 2394048B1
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EP
European Patent Office
Prior art keywords
fluid
chamber
sealing edge
throttle
module
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.)
Not-in-force
Application number
EP10701021.7A
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German (de)
French (fr)
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EP2394048A1 (en
Inventor
Alexander Kuschel
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.)
Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2394048A1 publication Critical patent/EP2394048A1/en
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Publication of EP2394048B1 publication Critical patent/EP2394048B1/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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to an injector assembly for an injection valve, comprising an injector body, with a nozzle needle which is arranged in a recess of the injector body so that it prevents fluid flow through at least one injection port in a closed position and releases a fluid flow through the injection port in an open position , Furthermore, the invention relates to an injection valve having an injector assembly and an actuator unit, wherein the injector assembly and the actuator unit are coupled together.
  • a correspondingly good mixture preparation can be achieved if the fuel is metered under very high pressure.
  • the fuel pressures are up to 2000 bar.
  • Such high pressures place both high demands on the material of the injector and its construction.
  • large forces must be absorbed by the injector assembly.
  • the DE 102 20 931 C1 discloses an injector for injecting fuel into a combustion chamber of an internal combustion engine.
  • the injector includes an injector body, a nozzle needle, and a controller to control a pressure in a control chamber for actuating the nozzle needle.
  • the injector comprises an inlet throttle and an outlet throttle, which are in hydraulic communication with the control chamber.
  • the inlet throttle and the outlet throttle are arranged in a throttle module formed as a separate component and sealed by means of cutting edges.
  • the object of the invention is to provide an injector assembly and an injection valve, which enables a reliable and precise operation and is designed to save space.
  • the invention is characterized by an injector assembly for an injection valve, with an injector body having a central longitudinal axis and a recess with a fluid inlet, a nozzle needle, which is arranged axially movable in the recess, such that in a closed position of the nozzle needle prevents fluid flow through at least one injection port and otherwise a fluid flow is released through the injection port, and the nozzle needle has an end facing away from the injection port, a chamber formed in the injector body which is adjacent to an injection opening of the front side of the nozzle needle, arranged in the chamber Throttling module, wherein formed in the throttle module is a hydraulically coupled to the fluid inlet fluid supply chamber, a control chamber hydraulically coupled via an inlet throttle to the fluid supply chamber for adjusting a pressure force which can be applied to the nozzle needle, and a valve chamber hydraulically coupled via an outlet throttle to the control chamber for receiving a valve which is designed to discharge fluid into a fluid return line, and one in the Chamber arranged and the
  • a first and a second sealing edge are formed between the throttle module and the injector body and / or the control module.
  • a first sealing edge is a further hydraulic coupling of the fluid supply chamber with the control chamber and by means of the second sealing edge is prevented further hydraulic coupling of the fluid supply chamber with the valve chamber.
  • a third sealing edge is formed, by means of which a hydraulic coupling of the fluid supply chamber is prevented with the fluid return line.
  • the injector assembly together with an actuator unit can form the injection valve.
  • the throttle module can reach small dimensions. This achieves a small axial length of the throttle module and, as a consequence, a small axial extent of the injector assembly. This also small recesses for the throttles in the throttle module are possible. In addition, favorable flow conditions of the fluid in the throttle module and thus a low abrasion of the throttle module can be achieved. A hardening of the throttle module can therefore be omitted. In addition, due to the small number of sealing edges, a high component strength and a lower sensitivity of the throttle module to external mechanical influences can be achieved. The dimensions of the fluid supply chamber, the control chamber and the valve chamber can also be very small, whereby the processing cost of these chambers can be low. Overall, low costs for the throttle module and thus for the entire injector assembly can be achieved.
  • the sealing edges are formed on the throttle module.
  • the throttle module is not overdetermined with respect to its sealing edges.
  • one of the sealing edges on one of the nozzle needle facing the axial end of the throttle module and the other of the sealing edges on one of the nozzle needle remote axial end of the throttle module is formed.
  • the first sealing edge is formed on the injector body and / or the second sealing edge on the control module.
  • the sealing edges are formed as cutting edges.
  • particularly good sealing properties of the sealing edges can be achieved.
  • the invention is characterized by an injection valve with an actuator unit and an injector assembly according to the first aspect.
  • the actuator unit is coupled to the injector assembly in such a way that the injector assembly can be actuated by means of the actuator unit.
  • the injector assembly 14 has an injector body 12 with a central longitudinal axis L and a recess 32.
  • the injector body 12 may be made in one piece or in several pieces.
  • a nozzle needle 34 is arranged in the recess 32 of the injector body 12.
  • the nozzle needle 34 may be made in one piece or in several parts.
  • the actuator unit 16 is arranged in the injector body 12.
  • the actuator unit 16 can be designed, in particular, as a piezoactuator with a stack of piezoelements, and its axial extent changes as a function of the applied electrical voltage.
  • the electrical voltage is applied to the actuator unit via a connection socket.
  • the actuator unit 16 is connected to a transformer 20, which is likewise arranged in the injector body 12.
  • the actuator unit 16 and the transformer 20 form an actuator for the nozzle needle 34.
  • the injector body 12 further comprises a high-pressure port 18, via which the injection valve 10 in the assembled state with a high-pressure circuit, not shown, of a fluid is connected.
  • a chamber 22 is arranged in the recess 32 of the injector body 12.
  • a throttle module 24 and a control module 26 are arranged, the structure and function will be described in detail below.
  • a coupled to the transformer 20 valve 28 with a valve body 29 and a valve spring 30 is arranged in the throttle module 24 and the control module 26 .
  • the valve 28 may be formed in other (not shown) embodiments without valve spring 30. This is especially true when the valve body 29 is formed as a ball. If the valve 28 is formed without valve spring 30, then the throttle module 24 may be made very small.
  • fluid return lines 31 are arranged, which allow a hydraulic connection to a tank, not shown, of the vehicle.
  • the chamber 22 is hydraulically coupled to the fluid return lines 31 or hydraulically decoupled from these.
  • the injection valve 10 further comprises a nozzle body 35, which is connected by means of a nozzle retaining nut 36 with the injector body 12. At the end remote from the actuator unit 16, one or more injection openings 52 are or are arranged in the nozzle body 35.
  • the nozzle needle 34 has an end face 38 facing the chamber 22. In its region facing the at least one injection opening 52, the nozzle needle 34 has a shank portion 44. At its end facing the actuator unit 16, the shank portion 44 of the nozzle needle 34 has a nozzle needle shoulder 45, which is in contact with fluid which has approximately the pressure of the high-pressure circuit.
  • the nozzle needle heel 45 is formed so that the force caused by the pressure of the fluid acts to open the nozzle needle 34.
  • a cavity 46 is further formed, which receives a nozzle spring 48, which is supported on the one hand on a shoulder 50 of the cavity 46 and on the other hand, the nozzle needle 34 biased so that it assumes a closed position in which it passes through the fluid flow the at least one arranged in the nozzle body 35 injection opening 52 prevents.
  • the nozzle needle position depends on the force balance of the forces caused by the pressure of the fluid on the nozzle needle hub 45 and on the tip of the nozzle needle 34, and on the other hand, the spring force of the nozzle spring 48 and the force caused by the pressure of the fluid that is located in the chamber 22, and the force caused thereby, which is introduced via the end face 38 of the nozzle needle 34 in the closing direction of the nozzle needle 34.
  • the throttle module 24 is formed substantially cylindrical with a module body 53 and extends in the chamber 22 of the injector body 12 in the direction of the longitudinal axis L.
  • a fluid supply chamber 54 is formed, which is arranged as an annular gap between the body of the throttle module 24 and the injector body 12 and is hydraulically coupled to the fluid inlet 23.
  • the throttle module 24 has a control chamber 56, which forms part of the chamber 22, and via which a pressure force can be applied to the nozzle needle 34 by means of the fluid, by means of the in the closed position of the nozzle needle 34th prevents fluid flow through the at least one injection port 52 and otherwise a fluid flow through the at least one injection port 52 is released.
  • a valve chamber 58 is formed, in which at least a part of the valve body 29 and the valve spring 30 of the valve 28 are arranged.
  • the fluid supply chamber 54 is hydraulically connected to the control chamber 56 via an inlet throttle 60. Furthermore, between the control chamber 56 and the valve chamber 58, an outlet throttle 62 is arranged in the module body 53 of the throttle module 24, by means of which the control chamber 56 is hydraulically coupled to the valve chamber 58.
  • valve 28 in particular the valve body 29, can be actuated via the actuator unit 60 and can close or release a sealing seat 63 formed on the control module 26.
  • a provision of the valve body 29 is effected by means of the helical spring designed valve spring 30.
  • the return of the valve body 29 is effected by means of a force acting on these hydraulic force.
  • a first sealing edge 64 is formed, namely at one of the nozzle needle 34 facing the axial end of the throttle module 24th It is thus possible to prevent a further hydraulic coupling between the fluid supply chamber 54 designed as an annular gap and the control chamber 56, whereby it is possible via the dimensioning of the inlet throttle 60 to supply fluid to the control chamber 56 and thus, when the valve 28 is closed, to increase the pressure set the control room 56.
  • the first sealing edge 64 is preferably formed as a cutting edge, since thus a particularly good seal between the throttle module 24 and the injector body 12 can be achieved.
  • a second sealing edge 66 is formed between the throttle module 24 and the control module 26.
  • the sealing edge 66 is preferably arranged on an axial end of the throttle module 24 facing away from the nozzle needle 34.
  • a further hydraulic coupling between the fluid supply chamber 54 and the valve chamber 58 can be prevented. This is particularly important when the valve 28 is open, that is, the valve body 29 is lifted from the sealing seat 63. In this case, by means of the second sealing edge 66, an unintentional outflow of the fluid from the fluid supply chamber 54 via the valve chamber 58 to the fluid return line 31 can be avoided.
  • a third sealing edge 68 is formed between the injector body 12 and the control module 26, a third sealing edge 68 is formed. By means of the third sealing edge 68, a direct hydraulic coupling of the fluid supply chamber 54 with the fluid return line 31 can be prevented.
  • the throttle module 24 Due to the design of the first sealing edge 64 on the axial end of the throttle module 24 facing the nozzle needle 34 and the formation of the second sealing edge 66 on the axial end of the throttle module 24 facing away from the nozzle needle 34, it is possible to form the throttle module 24 very simply. in particular, since a simple production of the sealing edges 64, 66 is possible. On the other hand, the throttle module 24 with respect to its sealing edges 64, 66 is not overdetermined. This allows relatively high tolerances in the production of the throttle module 24, in particular with respect to the tolerances for the sealing edges 64, 66 are allowed. The simple cylindrical design of the throttle module 24 also allows small dimensions of the throttle module 24 and a high component strength.
  • sealing edges 64, 66 By forming the sealing edges 64, 66 as cutting edges good sealing properties of the sealing edges are possible.
  • the actuator unit 16 is deactivated, whereby the valve body 29 again comes into contact with the sealing seat 63 in the control module 26.
  • the hydraulic coupling between the control chamber 56 and the fluid return line 31 is interrupted.
  • the pressure in the control chamber 56 increases, whereby the valve needle 34, optionally with the assistance of the nozzle spring 48, moves away from the actuator unit 16 in the axial direction becomes.
  • the nozzle needle 34 enters a closed position and the fluid flow through the at least one injection opening 52 is prevented.
  • the support of the nozzle spring 48 for closing the nozzle needle 34 is particularly important during the starting phase of the internal combustion engine and in terms of increased reliability of the closing operation of the nozzle needle 34.
  • the formation of the first and second sealing edge 62, 64 on the throttle module 24 can in particular secure control of the fluid from the fluid supply chamber 54 to the control chamber 56 and from the control chamber 56 via the valve chamber 58 to the fluid return line 31 can be achieved.
  • first sealing edge 64 instead of in the throttle module 24 in the injector body 12
  • second sealing edge instead of in the throttle module 24 in the control module 26
  • third sealing edge 68 instead of in the injector body 12 in the control module 26 form.

Description

Die Erfindung betrifft eine Injektorbaugruppe für ein Einspritzventil, mit einem Injektorkörper, mit einer Düsennadel, die in einer Ausnehmung des Injektorkörpers so angeordnet ist, dass sie in einer Schließposition einen Fluidfluss durch mindestens eine Einspritzöffnung verhindert und in einer Offenposition einen Fluidfluss durch die Einspritzöffnung frei gibt. Ferner betrifft die Erfindung ein Einspritzventil mit einer Injektorbaugruppe und einer Aktuatoreinheit, wobei der die Injektorbaugruppe und die Aktuatoreinheit miteinander gekoppelt sind.The invention relates to an injector assembly for an injection valve, comprising an injector body, with a nozzle needle which is arranged in a recess of the injector body so that it prevents fluid flow through at least one injection port in a closed position and releases a fluid flow through the injection port in an open position , Furthermore, the invention relates to an injection valve having an injector assembly and an actuator unit, wherein the injector assembly and the actuator unit are coupled together.

Immer strengere gesetzliche Vorschriften bezüglich der zulässigen Schadstoffemission von Brennkraftmaschinen, die in Kraftfahrzeugen angeordnet sind, machen es erforderlich, diverse Maßnahmen vorzunehmen, durch welche die Schadstoffemissionen gesenkt werden. Ein Ansatzpunkt hierbei ist, die von der Brennkraftmaschine erzeugten Schadstoffemissionen zu senken. Die Bildung von Ruß ist stark abhängig von der Aufbereitung des Luft/Kraftstoff-Gemisches in dem jeweiligen Zylinder der Brennkraftmaschine.Ever stricter legal regulations regarding the permissible pollutant emissions of internal combustion engines, which are arranged in motor vehicles, make it necessary to carry out various measures by which the pollutant emissions are reduced. One starting point here is to reduce the pollutant emissions generated by the internal combustion engine. The formation of soot is highly dependent on the preparation of the air / fuel mixture in the respective cylinder of the internal combustion engine.

Eine entsprechend gute Gemischaufbereitung kann erreicht werden, wenn der Kraftstoff unter sehr hohem Druck zugemessen wird. Im Falle von Diesel-Brennkraftmaschinen betragen die Kraftstoffdrücke bis zu 2000 bar. Derart hohe Drücke stellen sowohl hohe Anforderungen an das Material der Injektorbaugruppe als auch an deren Konstruktion. Gleichzeitig müssen von der Injektorbaugruppe große Kräfte aufgenommen werden können.A correspondingly good mixture preparation can be achieved if the fuel is metered under very high pressure. In the case of diesel internal combustion engines, the fuel pressures are up to 2000 bar. Such high pressures place both high demands on the material of the injector and its construction. At the same time, large forces must be absorbed by the injector assembly.

Die DE 102 20 931 C1 offenbart einen Injektor zum Einspritzen von Kraftstoff in einen Brennraum einer Brennkraftmaschine. Der Injektor umfasst einen Injektorkörper, eine Düsennadel und eine Steuereinrichtung, um einen Druck in einem Steuerraum zur Betätigung der Düsennadel zu steuern. Weiterhin umfasst der Injektor eine Zulaufdrossel und eine Ablaufdrossel, welche mit dem Steuerraum in hydraulischer Verbindung stehen. Die Zulaufdrossel und die Ablaufdrossel sind in einem als separates Bauteil gebildeten und mittels Schneidkanten abgedichteten Drosselmodul angeordnet.The DE 102 20 931 C1 discloses an injector for injecting fuel into a combustion chamber of an internal combustion engine. The injector includes an injector body, a nozzle needle, and a controller to control a pressure in a control chamber for actuating the nozzle needle. Furthermore, the injector comprises an inlet throttle and an outlet throttle, which are in hydraulic communication with the control chamber. The inlet throttle and the outlet throttle are arranged in a throttle module formed as a separate component and sealed by means of cutting edges.

Die Aufgabe der Erfindung ist es, eine Injektorbaugruppe und ein Einspritzventil zu schaffen, die beziehungsweise das einen zuverlässigen und präzisen Betrieb ermöglicht und Platz sparend ausgebildet ist.The object of the invention is to provide an injector assembly and an injection valve, which enables a reliable and precise operation and is designed to save space.

Die Aufgabe wird gelöst durch die Merkmale der unabhängigen Ansprüche. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is solved by the features of the independent claims. Advantageous embodiments of the invention are characterized in the subclaims.

Gemäß eines ersten Aspekts zeichnet sich die Erfindung aus durch eine Injektorbaugruppe für ein Einspritzventil, mit einem Injektorkörper mit einer zentralen Längsachse und einer Ausnehmung mit einem Fluideintritt, einer Düsennadel, die in der Ausnehmung axial bewegbar angeordnet ist, derart, dass in einer Schließposition der Düsennadel ein Fluidfluss durch mindestens eine Einspritzöffnung verhindert und ansonsten ein Fluidfluss durch die Einspritzöffnung freigegeben ist, und die Düsennadel eine der Einspritzöffnung abgewandte Stirnseite aufweist, einer in dem Injektorkörper ausgebildeten Kammer, die an eine der Einspritzöffnung abgewandten Stirnseite der Düsennadel grenzt, einem in der Kammer angeordneten Drosselmodul, wobei in dem Drosselmodul ausgebildet ist eine mit dem Fluideintritt hydraulisch gekoppelte Fluidzufuhrkammer, ein über eine Zulaufdrossel mit der Fluidzufuhrkammer hydraulisch gekoppelter Steuerraum zum Einstellen einer auf die Düsennadel aufbringbaren Druckkraft, und eine über eine Ablaufdrossel mit dem Steuerraum hydraulisch gekoppelte Ventilkammer zur Aufnahme eines Ventils, das ausgebildet ist zum Abführen von Fluid in eine Fluidrücklaufleitung, und einem in der Kammer angeordneten und dem Drosselmodul benachbarten Steuermodul, in dem die Fluidrücklaufleitung angeordnet ist. Zwischen dem Drosselmodul und dem Injektorkörper und/oder dem Steuermodul sind genau eine erste und eine zweite Dichtkante ausgebildet. Mittels der ersten Dichtkante ist eine weitere hydraulische Kopplung der Fluidzufuhrkammer mit dem Steuerraum und mittels der zweiten Dichtkante ist eine weitere hydraulische Kopplung der Fluidzufuhrkammer mit der Ventilkammer unterbunden. Zwischen dem Injektorkörper und dem Steuermodul ist eine dritte Dichtkante ausgebildet, mittels der eine hydraulische Kopplung der Fluidzufuhrkammer mit der Fluidrücklaufleitung unterbunden ist.According to a first aspect, the invention is characterized by an injector assembly for an injection valve, with an injector body having a central longitudinal axis and a recess with a fluid inlet, a nozzle needle, which is arranged axially movable in the recess, such that in a closed position of the nozzle needle prevents fluid flow through at least one injection port and otherwise a fluid flow is released through the injection port, and the nozzle needle has an end facing away from the injection port, a chamber formed in the injector body which is adjacent to an injection opening of the front side of the nozzle needle, arranged in the chamber Throttling module, wherein formed in the throttle module is a hydraulically coupled to the fluid inlet fluid supply chamber, a control chamber hydraulically coupled via an inlet throttle to the fluid supply chamber for adjusting a pressure force which can be applied to the nozzle needle, and a valve chamber hydraulically coupled via an outlet throttle to the control chamber for receiving a valve which is designed to discharge fluid into a fluid return line, and one in the Chamber arranged and the throttle module adjacent control module, in which the fluid return line is arranged. Between the throttle module and the injector body and / or the control module exactly a first and a second sealing edge are formed. By means of the first sealing edge is a further hydraulic coupling of the fluid supply chamber with the control chamber and by means of the second sealing edge is prevented further hydraulic coupling of the fluid supply chamber with the valve chamber. Between the injector body and the control module, a third sealing edge is formed, by means of which a hydraulic coupling of the fluid supply chamber is prevented with the fluid return line.

Die Injektorbaugruppe kann beispielsweise zusammen mit einer Aktuatoreinheit das Einspritzventil bilden.For example, the injector assembly together with an actuator unit can form the injection valve.

Dies hat den Vorteil, dass das Drosselmodul kleine Abmessungen erreichen kann. Damit ist eine geringe axiale Länge des Drosselmoduls und in der Folge eine geringe axiale Ausdehnung der Injektorbaugruppe erreichbar. Damit sind auch kleine Ausnehmungen für die Drosseln im Drosselmodul möglich. Darüber hinaus sind auch günstige Strömungsverhältnisse des Fluids in dem Drosselmodul und somit eine geringe Abrasion des Drosselmoduls erreichbar. Ein Härten des Drosselmoduls kann deshalb entfallen. Durch die kleine Zahl der Dichtkanten sind darüber hinaus eine hohe Bauteilfestigkeit und eine geringere Empfindlichkeit des Drosselmoduls gegenüber äußeren mechanischen Einflüssen erreichbar. Die Abmessungen der Fluidzufuhrkammer, des Steuerraums und der Ventilkammer können ebenfalls sehr klein sein, wodurch der Bearbeitungsaufwand für diese Kammern gering sein kann. Insgesamt lassen sich geringe Kosten für das Drosselmodul und damit für die gesamte Injektorbaugruppe erreichen.This has the advantage that the throttle module can reach small dimensions. This achieves a small axial length of the throttle module and, as a consequence, a small axial extent of the injector assembly. This also small recesses for the throttles in the throttle module are possible. In addition, favorable flow conditions of the fluid in the throttle module and thus a low abrasion of the throttle module can be achieved. A hardening of the throttle module can therefore be omitted. In addition, due to the small number of sealing edges, a high component strength and a lower sensitivity of the throttle module to external mechanical influences can be achieved. The dimensions of the fluid supply chamber, the control chamber and the valve chamber can also be very small, whereby the processing cost of these chambers can be low. Overall, low costs for the throttle module and thus for the entire injector assembly can be achieved.

In einer vorteilhaften Ausgestaltung sind die Dichtkanten an dem Drosselmodul ausgebildet. Damit ist eine einfache Fertigung der Dichtkanten möglich. Das Drosselmodul ist bezüglich seiner Dichtkanten nicht überbestimmt.In an advantageous embodiment, the sealing edges are formed on the throttle module. For a simple production of the sealing edges is possible. The throttle module is not overdetermined with respect to its sealing edges.

In einer weiteren vorteilhaften Ausgestaltung ist die eine der Dichtkanten an einem der Düsennadel zugewandten axialen Ende des Drosselmoduls und die andere der Dichtkanten an einem der Düsennadel abgewandten axialen Ende des Drosselmoduls ausgebildet. Damit ist eine einfache Ausbildung des Drosselmoduls möglich.In a further advantageous embodiment, one of the sealing edges on one of the nozzle needle facing the axial end of the throttle module and the other of the sealing edges on one of the nozzle needle remote axial end of the throttle module is formed. For a simple design of the throttle module is possible.

In einer weiteren vorteilhaften Ausgestaltung ist die erste Dichtkante an dem Injektorkörper und/oder die zweite Dichtkante an dem Steuermodul ausgebildet. Damit ist eine einfache Fertigung der Dichtkanten möglich.In a further advantageous embodiment, the first sealing edge is formed on the injector body and / or the second sealing edge on the control module. For a simple production of the sealing edges is possible.

In einer weiteren vorteilhaften Ausgestaltung sind die Dichtkanten als Schneidkanten ausgebildet. Damit sind besonders gute Dichteigenschaften der Dichtkanten erreichbar.In a further advantageous embodiment, the sealing edges are formed as cutting edges. Thus, particularly good sealing properties of the sealing edges can be achieved.

Gemäß eines zweiten Aspekts zeichnet sich die Erfindung aus durch ein Einspritzventil mit einer Aktuatoreinheit und einer Injektorbaugruppe gemäß des ersten Aspekts. Die Aktuatoreinheit ist derart mit der Injektorbaugruppe gekoppelt, dass die Injektorbaugruppe mittels der Aktuatoreinheit betätigbar ist. Ausführungsbeispiele der Erfindung sind im Folgenden anhand der schematischen Zeichnungen näher erläutert.According to a second aspect, the invention is characterized by an injection valve with an actuator unit and an injector assembly according to the first aspect. The actuator unit is coupled to the injector assembly in such a way that the injector assembly can be actuated by means of the actuator unit. Embodiments of the invention are explained in more detail below with reference to the schematic drawings.

Es zeigen:

  • Figur 1 einen Längsschnitt durch ein Einspritzventil mit einer Injektorbaugruppe, und
  • Figur 2 eine Detailansicht der Injektorbaugruppe in einem Längsschnitt.
  • Figur 1 zeigt ein Einspritzventil 10 mit einer Injektorbaugruppe 14 und einer Aktuatoreinheit 16.
Show it:
  • FIG. 1 a longitudinal section through an injection valve with an injector, and
  • FIG. 2 a detailed view of the injector in a longitudinal section.
  • FIG. 1 1 shows an injection valve 10 with an injector assembly 14 and an actuator unit 16.

Die Injektorbaugruppe 14 weist einen Injektorkörper 12 mit einer zentralen Längsachse L und einer Ausnehmung 32 auf. Der Injektorkörper 12 kann einstückig oder mehrstückig ausgeführt sein. In der Ausnehmung 32 des Injektorkörpers 12 ist eine Düsennadel 34 angeordnet. Die Düsennadel 34 kann einteilig oder mehrteilig ausgeführt sein.The injector assembly 14 has an injector body 12 with a central longitudinal axis L and a recess 32. The injector body 12 may be made in one piece or in several pieces. In the recess 32 of the injector body 12, a nozzle needle 34 is arranged. The nozzle needle 34 may be made in one piece or in several parts.

Die Aktuatoreinheit 16 ist in dem Injektorkörper 12 angeordnet. Die Aktuatoreinheit 16 kann insbesondere als Piezoaktuator mit einem Stapel von Piezoelementen ausgebildet sein und ihre axiale Ausdehnung ändert sich abhängig von der angelegten elektrischen Spannung. Die elektrische Spannung wird über eine Anschlussbuchse an die Aktuatoreinheit angelegt. Die Aktuatoreinheit 16 ist mit einem Übertrager 20 verbunden, der ebenfalls in dem Injektorkörper 12 angeordnet ist. Die Aktuatoreinheit 16 und der Übertrager 20 bilden einen Stellantrieb für die Düsennadel 34.The actuator unit 16 is arranged in the injector body 12. The actuator unit 16 can be designed, in particular, as a piezoactuator with a stack of piezoelements, and its axial extent changes as a function of the applied electrical voltage. The electrical voltage is applied to the actuator unit via a connection socket. The actuator unit 16 is connected to a transformer 20, which is likewise arranged in the injector body 12. The actuator unit 16 and the transformer 20 form an actuator for the nozzle needle 34.

Der Injektorkörper 12 umfasst ferner einen Hochdruckanschluss 18, über den das Einspritzventil 10 im montierten Zustand mit einem nicht dargestellten Hochdruckkreis eines Fluids verbunden ist.The injector body 12 further comprises a high-pressure port 18, via which the injection valve 10 in the assembled state with a high-pressure circuit, not shown, of a fluid is connected.

In der Ausnehmung 32 des Injektorkörpers 12 ist eine Kammer 22 angeordnet. Die Verbindung zwischen dem Hochdruckanschluss 18 und der Kammer 22 erfolgt über einen Fluideintritt 23. In der Kammer 22 sind ein Drosselmodul 24 und ein Steuermodul 26 angeordnet, deren Struktur und Funktion weiter unten im Detail beschrieben werden. In dem Drosselmodul 24 und dem Steuermodul 26 ist ein mit dem Übertrager 20 gekoppeltes Ventil 28 mit einem Ventilkörper 29 und einer Ventilfeder 30 angeordnet. Abhängig von der Form des Ventilkörpers 29 kann das Ventil 28 in weiteren (nicht dargestellten) Ausführungsformen auch ohne Ventilfeder 30 ausgebildet sein. Dies gilt insbesondere dann, wenn der Ventilkörper 29 als Kugel ausgebildet ist. Ist das Ventil 28 ohne Ventilfeder 30 ausgebildet, so kann das Drosselmodul 24 sehr klein ausgebildet sein.In the recess 32 of the injector body 12, a chamber 22 is arranged. The connection between the high pressure port 18 and the chamber 22 via a fluid inlet 23. In the chamber 22, a throttle module 24 and a control module 26 are arranged, the structure and function will be described in detail below. In the throttle module 24 and the control module 26 a coupled to the transformer 20 valve 28 with a valve body 29 and a valve spring 30 is arranged. Depending on the shape of the valve body 29, the valve 28 may be formed in other (not shown) embodiments without valve spring 30. This is especially true when the valve body 29 is formed as a ball. If the valve 28 is formed without valve spring 30, then the throttle module 24 may be made very small.

In dem Steuermodul 26 sind Fluidrücklaufleitungen 31 angeordnet, die eine hydraulische Verbindung zu einem nicht gezeigten Tank des Fahrzeugs ermöglichen. Abhängig von der Stellung des Ventils 28 ist die Kammer 22 mit den Fluidrücklaufleitungen 31 hydraulisch gekoppelt oder von diesen hydraulisch entkoppelt.In the control module 26 fluid return lines 31 are arranged, which allow a hydraulic connection to a tank, not shown, of the vehicle. Depending on the position of the valve 28, the chamber 22 is hydraulically coupled to the fluid return lines 31 or hydraulically decoupled from these.

Das Einspritzventil 10 umfasst weiter einen Düsenkörper 35, der mittels einer Düsenspannmutter 36 mit dem Injektorkörper 12 verbunden ist. An dem der Aktuatoreinheit 16 abgewandten Ende ist oder sind in dem Düsenkörper 35 eine oder mehrere Einspritzöffnungen 52 angeordnet.The injection valve 10 further comprises a nozzle body 35, which is connected by means of a nozzle retaining nut 36 with the injector body 12. At the end remote from the actuator unit 16, one or more injection openings 52 are or are arranged in the nozzle body 35.

Die Düsennadel 34 hat eine der Kammer 22 zugewandte Stirnseite 38. In ihrem der mindestens einen Einspritzöffnung 52 zugewandten Bereich hat die Düsennadel 34 einen Schaftabschnitt 44. An seinem der Aktuatoreinheit 16 zugewandten Ende hat der Schaftabschnitt 44 der Düsennadel 34 einen Düsennadelabsatz 45, der mit Fluid in Kontakt steht, das in etwa den Druck des Hochdruckkreises hat. Der Düsennadelabsatz 45 ist so ausgebildet, dass die durch den Druck des Fluids hervorgerufene Kraft öffnend auf die Düsennadel 34 wirkt.The nozzle needle 34 has an end face 38 facing the chamber 22. In its region facing the at least one injection opening 52, the nozzle needle 34 has a shank portion 44. At its end facing the actuator unit 16, the shank portion 44 of the nozzle needle 34 has a nozzle needle shoulder 45, which is in contact with fluid which has approximately the pressure of the high-pressure circuit. The nozzle needle heel 45 is formed so that the force caused by the pressure of the fluid acts to open the nozzle needle 34.

In dem Injektorkörper 12 ist weiter ein Hohlraum 46 ausgebildet, der eine Düsenfeder 48 aufnimmt, die sich einerseits an einem Absatz 50 des Hohlraums 46 abstützt und andererseits die Düsennadel 34 so vorspannt, dass sie eine dieser zugeordnete Schließposition einnimmt, in der sie den Fluidfluss durch die mindestens eine in dem Düsenkörper 35 angeordnete Einspritzöffnung 52 unterbindet.In the injector body 12, a cavity 46 is further formed, which receives a nozzle spring 48, which is supported on the one hand on a shoulder 50 of the cavity 46 and on the other hand, the nozzle needle 34 biased so that it assumes a closed position in which it passes through the fluid flow the at least one arranged in the nozzle body 35 injection opening 52 prevents.

Die Düsennadelposition hängt von der Kräftebilanz der Kräfte ab, die hervorgerufen durch den Druck des Fluids auf den Düsennadelabsatz 45 und auf die Spitze der Düsennadel 34 wirken, und andererseits der Federkraft der Düsenfeder 48 und der Kraft, die durch den Druck des Fluids, das sich in der Kammer 22 befindet, und die dadurch hervorgerufene Kraft, die über die Stirnseite 38 der Düsennadel 34 in der Schließrichtung der Düsennadel 34 eingeleitet wird.The nozzle needle position depends on the force balance of the forces caused by the pressure of the fluid on the nozzle needle hub 45 and on the tip of the nozzle needle 34, and on the other hand, the spring force of the nozzle spring 48 and the force caused by the pressure of the fluid that is located in the chamber 22, and the force caused thereby, which is introduced via the end face 38 of the nozzle needle 34 in the closing direction of the nozzle needle 34.

Wie in Figur 2 dargestellt, ist das Drosselmodul 24 im Wesentlichen zylinderförmig mit einem Modulkörper 53 ausgebildet und erstreckt sich in der Kammer 22 des Injektorkörpers 12 in Richtung der Längsachse L.As in FIG. 2 illustrated, the throttle module 24 is formed substantially cylindrical with a module body 53 and extends in the chamber 22 of the injector body 12 in the direction of the longitudinal axis L.

In dem Drosselmodul 24 ist eine Fluidzufuhrkammer 54 ausgebildet, die als ringförmiger Spalt zwischen dem Körper des Drosselmoduls 24 und dem Injektorkörper 12 angeordnet ist und mit dem Fluideintritt 23 hydraulisch gekoppelt ist.In the throttle module 24, a fluid supply chamber 54 is formed, which is arranged as an annular gap between the body of the throttle module 24 and the injector body 12 and is hydraulically coupled to the fluid inlet 23.

An seinem der Stirnseite 38 der Düsennadel 34 zugewandten Ende hat das Drosselmodul 24 einen Steuerraum 56, der einen Teil der Kammer 22 bildet, und über den auf die Düsennadel 34 mittels des Fluids eine Druckkraft aufgebracht werden kann, mittels der in der Schließposition der Düsennadel 34 ein Fluidfluss durch die mindestens eine Einspritzöffnung 52 verhindert und ansonsten ein Fluidfluss durch die mindestens eine Einspritzöffnung 52 freigegeben ist.At its end facing the front side 38 of the nozzle needle 34, the throttle module 24 has a control chamber 56, which forms part of the chamber 22, and via which a pressure force can be applied to the nozzle needle 34 by means of the fluid, by means of the in the closed position of the nozzle needle 34th prevents fluid flow through the at least one injection port 52 and otherwise a fluid flow through the at least one injection port 52 is released.

In dem Drosselmodul 24 ist zugewandt zu dem Steuermodul 26 eine Ventilkammer 58 ausgebildet, in der mindestens ein Teil des Ventilkörpers 29 und die Ventilfeder 30 des Ventils 28 angeordnet sind.In the throttle module 24 facing the control module 26, a valve chamber 58 is formed, in which at least a part of the valve body 29 and the valve spring 30 of the valve 28 are arranged.

Die Fluidzufuhrkammer 54 steht über eine Zulaufdrossel 60 hydraulisch mit dem Steuerraum 56 in Verbindung. Des Weiteren ist zwischen dem Steuerraum 56 und der Ventilkammer 58 eine Ablaufdrossel 62 in dem Modulkörper 53 des Drosselmoduls 24 angeordnet, durch die der Steuerraum 56 hydraulisch mit der Ventilkammer 58 gekoppelt ist.The fluid supply chamber 54 is hydraulically connected to the control chamber 56 via an inlet throttle 60. Furthermore, between the control chamber 56 and the valve chamber 58, an outlet throttle 62 is arranged in the module body 53 of the throttle module 24, by means of which the control chamber 56 is hydraulically coupled to the valve chamber 58.

Das Ventil 28, insbesondere der Ventilkörper 29, ist über die Aktuatoreinheit 60 betätigbar, und kann einen an dem Steuermodul 26 ausgebildeten Dichtsitz 63 verschließen beziehungsweise freigeben. Eine Rückstellung des Ventilkörpers 29 erfolgt mittels der als Spiralfeder ausgebildeten Ventilfeder 30. In den weiteren Ausführungsformen, bei denen das Ventil 28 ohne Ventilfeder 30 ausgebildet ist, erfolgt die Rückstellung des Ventilkörpers 29 mittels einer auf diesen wirkenden hydraulischen Kraft.The valve 28, in particular the valve body 29, can be actuated via the actuator unit 60 and can close or release a sealing seat 63 formed on the control module 26. A provision of the valve body 29 is effected by means of the helical spring designed valve spring 30. In the other embodiments, in which the valve 28 is formed without valve spring 30, the return of the valve body 29 is effected by means of a force acting on these hydraulic force.

Zwischen dem Drosselmodul 24 und dem Injektorkörper 12 ist eine erste Dichtkante 64 ausgebildet, und zwar an einem der Düsennadel 34 zugewandten axialen Ende des Drosselmoduls 24. Es kann so eine weitere hydraulische Kopplung zwischen der als ringförmiger Spalt ausgebildeten Fluidzufuhrkammer 54 und dem Steuerraum 56 verhindert werden, wodurch es möglich ist, über die Dimensionierung der Zulaufdrossel 60 die Fluidzufuhr in den Steuerraum 56 und damit, bei geschlossenem Ventil 28, den Druckanstieg in dem Steuerraum 56 festzulegen. Die erste Dichtkante 64 ist vorzugsweise als Schneidkante ausgebildet, da somit eine besonders gute Abdichtung zwischen dem Drosselmodul 24 und dem Injektorkörper 12 erreicht werden kann.Between the throttle module 24 and the injector body 12, a first sealing edge 64 is formed, namely at one of the nozzle needle 34 facing the axial end of the throttle module 24th It is thus possible to prevent a further hydraulic coupling between the fluid supply chamber 54 designed as an annular gap and the control chamber 56, whereby it is possible via the dimensioning of the inlet throttle 60 to supply fluid to the control chamber 56 and thus, when the valve 28 is closed, to increase the pressure set the control room 56. The first sealing edge 64 is preferably formed as a cutting edge, since thus a particularly good seal between the throttle module 24 and the injector body 12 can be achieved.

Zwischen dem Drosselmodul 24 und dem Steuermodul 26 ist eine zweite Dichtkante 66 ausgebildet. Die Dichtkante 66 ist vorzugsweise an einem der Düsennadel 34 abgewandten axialen Ende des Drosselmoduls 24 angeordnet. Mittels der zweiten Dichtkante 66 kann eine weitere hydraulische Kopplung zwischen der Fluidzufuhrkammer 54 und der Ventilkammer 58 verhindert werden. Dies ist insbesondere dann von Bedeutung, wenn das Ventil 28 offen ist, das heißt der Ventilkörper 29 von dem Dichtsitz 63 abgehoben ist. In diesem Fall kann mittels der zweiten Dichtkante 66 ein unbeabsichtigtes Abströmen des Fluids von der Fluidzufuhrkammer 54 über die Ventilkammer 58 zu der Fluidrücklaufleitung 31 vermieden werden.Between the throttle module 24 and the control module 26, a second sealing edge 66 is formed. The sealing edge 66 is preferably arranged on an axial end of the throttle module 24 facing away from the nozzle needle 34. By means of the second sealing edge 66, a further hydraulic coupling between the fluid supply chamber 54 and the valve chamber 58 can be prevented. This is particularly important when the valve 28 is open, that is, the valve body 29 is lifted from the sealing seat 63. In this case, by means of the second sealing edge 66, an unintentional outflow of the fluid from the fluid supply chamber 54 via the valve chamber 58 to the fluid return line 31 can be avoided.

Zwischen dem Injektorkörper 12 und dem Steuermodul 26 ist eine dritte Dichtkante 68 ausgebildet. Mittels der dritten Dichtkante 68 kann eine direkte hydraulische Kopplung der Fluidzufuhrkammer 54 mit der Fluidrücklaufleitung 31 unterbunden sein.Between the injector body 12 and the control module 26, a third sealing edge 68 is formed. By means of the third sealing edge 68, a direct hydraulic coupling of the fluid supply chamber 54 with the fluid return line 31 can be prevented.

Durch die Ausbildung der ersten Dichtkante 64 an dem der Düsennadel 34 zugewandten axialen Ende des Drosselmoduls 24 und die Ausbildung der zweiten Dichtkante 66 an den der Düsennadel 34 abgewandten axialen Ende des Drosselmoduls 24 ist es möglich, das Drosselmodul 24 zum einen sehr einfach auszubilden, da insbesondere eine einfache Fertigung der Dichtkanten 64, 66 möglich ist. Zum anderen ist das Drosselmodul 24 bezüglich seiner Dichtkanten 64, 66 nicht überbestimmt. Damit können relativ hohe Toleranzen bei der Fertigung des Drosselmoduls 24, insbesondere bezüglich der Toleranzen für die Dichtkanten 64, 66 zugelassen werden. Die einfache zylindrische Ausbildung des Drosselmoduls 24 erlaubt darüber hinaus kleine Abmessungen des Drosselmoduls 24 und eine hohe Bauteilfestigkeit. Durch eine geringe axiale Länge des Drosselmoduls 24 und damit eine geringe axiale Ausdehnung der Injektorbaugruppe 14 wird eine geringe axiale Ausdehnung des gesamten Einspritzventils 10 möglich. Darüber hinaus ist es möglich, durch die fluidmechanisch günstige Anordnung insbesondere der Zulaufdrossel 60 und der Ablaufdrossel 62 zu erreichen, dass nur eine geringe Wirbelbildung des Fluids in dem Steuerraum 56 und damit ein geringer abrasiver Verschleiß des Modulkörpers 53 des Drosselmoduls 24 erfolgt. Auf ein Härten des Drosselmoduls 24 kann deshalb verzichtet werden.Due to the design of the first sealing edge 64 on the axial end of the throttle module 24 facing the nozzle needle 34 and the formation of the second sealing edge 66 on the axial end of the throttle module 24 facing away from the nozzle needle 34, it is possible to form the throttle module 24 very simply. in particular, since a simple production of the sealing edges 64, 66 is possible. On the other hand, the throttle module 24 with respect to its sealing edges 64, 66 is not overdetermined. This allows relatively high tolerances in the production of the throttle module 24, in particular with respect to the tolerances for the sealing edges 64, 66 are allowed. The simple cylindrical design of the throttle module 24 also allows small dimensions of the throttle module 24 and a high component strength. Due to a small axial length of the throttle module 24 and thus a small axial extent of the Injektorbaugruppe 14, a small axial extent of the entire injection valve 10 is possible. In addition, it is possible to achieve by the fluid-mechanically favorable arrangement, in particular the inlet throttle 60 and the outlet throttle 62, that only a slight vortex formation of the fluid in the control chamber 56 and thus a low abrasive wear of the module body 53 of the throttle module 24 takes place. Hardening of the throttle module 24 can therefore be dispensed with.

Durch die Ausbildung der Dichtkanten 64, 66 als Schneidkanten sind gute Dichteigenschaften der Dichtkanten möglich.By forming the sealing edges 64, 66 as cutting edges good sealing properties of the sealing edges are possible.

Im Folgenden soll kurz die Funktion des Einspritzventils 10 dargestellt werden:

  • Durch Aktivieren der als Piezoaktuator ausgebildeten Aktuatoreinheit 16 dehnt sich die Aktuatoreinheit 16 aus und der Ventilkörper 29 wird über den Übertrager 20 von dem Dichtsitz 63 an dem Steuermodul 26 abgehoben. Damit wird eine hydraulische Verbindung von dem Steuerraum 56 über die Ventilkammer 58 zu der Fluidrücklaufleitung 31 freigegeben und der Druck in dem Steuerraum 56 sinkt ab. Damit wird das Kräftegleichgewicht an der Düsennadel 34 derart verändert, dass sich die Düsennadel 34 in Richtung auf die Aktuatoreinheit 16 in den Steuerraum 56 hineinbewegt, wodurch die mindestens eine Einspritzöffnung 52 in dem Düsenkörper 35 freigegeben wird. Ist das Einspritzventil 10 als Kraftstoffeinspritzventil ausgebildet, so kann eine Einspritzung von Kraftstoff in einen Brennraum einer Brennkraftmaschine erfolgen.
In the following, the function of the injection valve 10 will be briefly described:
  • By activating the actuator unit 16 designed as a piezoactuator, the actuator unit 16 expands and the valve body 29 is lifted off the sealing seat 63 on the control module 26 via the transformer 20. Thus, a hydraulic connection is released from the control chamber 56 via the valve chamber 58 to the fluid return line 31 and the pressure in the control chamber 56 decreases. Thus, the balance of forces on the nozzle needle 34 is changed such that the nozzle needle 34 in the direction of the actuator 16 in the Control chamber 56 moves in, whereby the at least one injection port 52 is released in the nozzle body 35. If the injection valve 10 is designed as a fuel injection valve, an injection of fuel into a combustion chamber of an internal combustion engine can take place.

Sobald die Einspritzung beendet werden soll, wird die Aktuatoreinheit 16 deaktiviert, wodurch der Ventilkörper 29 wieder in Kontakt mit dem Dichtsitz 63 in dem Steuermodul 26 gelangt. Damit ist die hydraulische Kopplung zwischen dem Steuerraum 56 und der Fluidrücklaufleitung 31 unterbrochen. Durch die Zufuhr von Fluid von dem Fluideintritt 23 über die Fluidzufuhrkammer 54 und die Zulaufdrossel 60 in den Steuerraum 56 steigt der Druck in dem Steuerraum 56 an, wodurch die Ventilnadel 34, gegebenenfalls mit Unterstützung der Düsenfeder 48, in axialer Richtung von der Aktuatoreinheit 16 wegbewegt wird. Damit gelangt die Düsennadel 34 in eine Schließposition und der Fluidfluss durch die mindestens eine Einspritzöffnung 52 wird unterbunden. Die Unterstützung der Düsenfeder 48 für das Schließen der Düsennadel 34 ist insbesondere während der Startphase der Brennkraftmaschine und im Hinblick auf eine erhöhte Funktionssicherheit des Schließvorgangs der Düsennadel 34 von Bedeutung.Once the injection is to be terminated, the actuator unit 16 is deactivated, whereby the valve body 29 again comes into contact with the sealing seat 63 in the control module 26. Thus, the hydraulic coupling between the control chamber 56 and the fluid return line 31 is interrupted. By the supply of fluid from the fluid inlet 23 via the fluid supply chamber 54 and the inlet throttle 60 in the control chamber 56, the pressure in the control chamber 56 increases, whereby the valve needle 34, optionally with the assistance of the nozzle spring 48, moves away from the actuator unit 16 in the axial direction becomes. Thus, the nozzle needle 34 enters a closed position and the fluid flow through the at least one injection opening 52 is prevented. The support of the nozzle spring 48 for closing the nozzle needle 34 is particularly important during the starting phase of the internal combustion engine and in terms of increased reliability of the closing operation of the nozzle needle 34.

Durch die Ausbildung der ersten und zweiten Dichtkante 62, 64 an dem Drosselmodul 24 kann insbesondere eine sichere Steuerung des Fluids von der Fluidzufuhrkammer 54 zu dem Steuerraum 56 sowie von dem Steuerraum 56 über die Ventilkammer 58 zu der Fluidrücklaufleitung 31 erreicht werden.The formation of the first and second sealing edge 62, 64 on the throttle module 24 can in particular secure control of the fluid from the fluid supply chamber 54 to the control chamber 56 and from the control chamber 56 via the valve chamber 58 to the fluid return line 31 can be achieved.

In weiteren Ausführungsformen, die hier nicht im Detail gezeigt sind, ist es auch möglich, die erste Dichtkante 64 anstatt in dem Drosselmodul 24 in dem Injektorkörper 12, die zweite Dichtkante anstatt in dem Drosselmodul 24 in dem Steuermodul 26 und die dritte Dichtkante 68 anstatt in dem Injektorkörper 12 in dem Steuermodul 26 auszubilden.In further embodiments, which are not shown in detail here, it is also possible for the first sealing edge 64 instead of in the throttle module 24 in the injector body 12, the second sealing edge instead of in the throttle module 24 in the control module 26 and the third sealing edge 68 instead of in the injector body 12 in the control module 26 form.

Claims (7)

  1. Injector assembly (14) for an injection valve (10), having
    - an injector body (12) with a central longitudinal axis (L) and a recess (32) with a fluid inlet (23),
    - a nozzle needle (34) which is arranged axially movably in the recess (32) in such a way that a fluid flow through at least one injection opening (52) is prevented in a closed position of the nozzle needle (34) and, otherwise, a fluid flow through the injection opening (52) is released, and the nozzle needle (34) has an end side (38) which faces away from the injection opening (52),
    - a chamber (22) which is formed in the injector body (12) and adjoins an end side (38) of the nozzle needle (34), which end side (38) faces away from the injection opening (52),
    - a throttle module (24) which is arranged in the chamber (22), a fluid feed chamber (54) which is coupled hydraulically to the fluid inlet (23), a control space (56) which is coupled hydraulically to the fluid feed chamber (54) via an inflow throttle (60) for setting a pressure force which can be applied to the pressure needle (34), and a valve chamber (58) which is coupled hydraulically to the control space (56) via an outflow throttle (62) for receiving a valve (28) which is configured for discharging fluid into a fluid return line (31) being formed in the throttle module (24), and
    - a control module (26) which is arranged in the chamber (22), is adjacent to the throttle module (24) and in which the fluid return line (31) is arranged, precisely one first sealing edge (64) being formed between the throttle module (24) and the injector body (12) and precisely one second sealing edge (66) being formed between the throttle module (24) and the control module (26), and a further hydraulic coupling of the fluid feed chamber (54) to the control space (56) being suppressed by means of the first sealing edge (64) and a further hydraulic coupling of the fluid feed chamber (54) to the valve chamber (58) being suppressed by means of the second sealing edge (66), and a third sealing edge (68) being formed between the injector body (12) and the control module (26), by means of which third sealing edge (68) a hydraulic coupling of the fluid feed chamber (54) to the fluid return line (31) is suppressed.
  2. Injector assembly (14) according to Claim 1, the first and the second sealing edges (64, 66) being formed on the throttle module (24).
  3. Injector assembly (14) according to one of the preceding claims, the first sealing edge (64) being formed at an axial end of the throttle module (24), which axial end faces the nozzle needle, and the second sealing edge (66) being formed at an axial end of the throttle module (24), which axial end faces away from the nozzle needle (34).
  4. Injector assembly (14) according to Claim 1, the first sealing edge (64) being formed on the injector body (12).
  5. Injector assembly (14) according to Claim 1 or 4, the second sealing edge (66) being formed on the control module (26).
  6. Injector assembly (14) according to one of the preceding claims, the first and/or the second sealing edge (64, 66) being formed as cutting edges.
  7. Injection valve (10) having an actuator unit (16) and an injector assembly (14) according to one of the preceding claims, the actuator unit (16) being coupled to the injector assembly (14) in such a way that the injector assembly (14) can be actuated by means of the actuator unit (16).
EP10701021.7A 2009-02-03 2010-01-25 Injector assembly for an injection valve Not-in-force EP2394048B1 (en)

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DE102009007213.6A DE102009007213B4 (en) 2009-02-03 2009-02-03 Injector assembly for an injection valve
PCT/EP2010/050791 WO2010089217A1 (en) 2009-02-03 2010-01-25 Injector assembly for an injection valve

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CN (1) CN102308080B (en)
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Publication number Priority date Publication date Assignee Title
EP2975257A1 (en) 2014-07-18 2016-01-20 Continental Automotive GmbH Control unit to control a valve pin of a fuel injector, fuel injector and method to provide a control valve unit

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US20110284667A1 (en) 2011-11-24
WO2010089217A1 (en) 2010-08-12
CN102308080A (en) 2012-01-04
CN102308080B (en) 2013-06-19
DE102009007213A1 (en) 2010-08-26
EP2394048A1 (en) 2011-12-14
US9080538B2 (en) 2015-07-14
DE102009007213B4 (en) 2017-06-14

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