EP2439398A1 - Fuel injector valve - Google Patents

Fuel injector valve Download PDF

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Publication number
EP2439398A1
EP2439398A1 EP11190884A EP11190884A EP2439398A1 EP 2439398 A1 EP2439398 A1 EP 2439398A1 EP 11190884 A EP11190884 A EP 11190884A EP 11190884 A EP11190884 A EP 11190884A EP 2439398 A1 EP2439398 A1 EP 2439398A1
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EP
European Patent Office
Prior art keywords
control chamber
filler
nozzle
fuel injection
bore
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
EP11190884A
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German (de)
French (fr)
Other versions
EP2439398B1 (en
Inventor
Jens Leister
Holger Rapp
Friedrich Howey
Cetin Irmak
Kasim-Melih Hamutcu
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2439398A1 publication Critical patent/EP2439398A1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the invention relates to a fuel injection valve with a switching valve arranged on the head side. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • an injector for injecting a high-pressure fluid through a nozzle is known.
  • the known injector body comprises a high-pressure inlet line and a non-pressurized outlet.
  • the injector body contains a solenoid valve, which serves to control the nozzle.
  • an axially extending sleeve is movably received, whose one end face is actuated by means of a valve and the other end face defines a control chamber into which a branch of a high-pressure inlet opens.
  • the sleeve in the injector body has a clearance of more than 0.01 mm, the diameter of the bore in the axially extending sleeve in the range of 1.5 mm.
  • the sleeve is mounted approximately free of play and indeed with a clearance of less than 0.01 mm, which places very high demands on the concentricity and the machining quality of the sleeve component.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the manufacturability, in particular with respect to a control chamber bore, is improved, wherein a head-side arrangement of the switching valve in the fuel injection valve is possible.
  • the filler is at least partially configured rod-shaped and that the filler at least partially extends through the control chamber bore of the holding body.
  • the filler in the control chamber bore sections have a three- or polygonal cross-section, so that one or more retaining edges are formed. With the retaining edge, the filler can form an interference fit with the control chamber bore in order to achieve a reliable attachment of the filler in the control chamber bore. As a result, the filler is fixed in the axial direction.
  • the filler in the control chamber bore is axially displaceable. This has the advantage that pressure changes, which are generated by the switching valve for driving the nozzle needle, also or even substantially affect a displacement of the filler in the control chamber bore. Thereby, a throttle effect that occurs when the pressure change propagates through the gap between the filler and the control space bore can be reduced.
  • a dimensioning is particularly advantageous in which the diameter of the control chamber bore has a similar or the same size as the diameter of that part of the nozzle needle which dips into the control chamber, wherein also the filler is arranged axially displaceable in the control chamber bore and not at rest an upper stop.
  • the filler moves analogously to the nozzle needle up and down, so that little or no Fuel from the nozzle side of the filler located portion of the control chamber in the control valve side part or vice versa must be spent.
  • throttle effects in the narrow gap between the inner wall of the control chamber bore and the filler and the pressure in the control chamber are also eliminated can largely be considered as uniform.
  • the filler can be inserted only in the control chamber bore, so that it remains axially displaceable therein.
  • a spring element is provided, that the filler has a shoulder, that the filler abuts at its shoulder on a nozzle body side stage of the control chamber bore and that the spring element presses the filler against the nozzle body side stage.
  • the filler can be acted upon by the bias of the spring element in order to achieve an axial fixation of the filler.
  • the spring element can be supported on the end face of the nozzle needle, whereby in addition a loading of the nozzle needle is possible, which optionally exerts a restoring force on the nozzle needle.
  • a nozzle spring is provided, which is supported on the one hand at a stage of the control chamber bore and on the other hand on a shoulder of the filler, and that the nozzle spring presses the filler against the end face of the nozzle needle.
  • a plant of the filler can be achieved on the nozzle needle.
  • the nozzle spring can exert a restoring force on the nozzle needle for closing the fuel injection valve.
  • a control chamber tube is provided which is at least partially disposed in the control chamber bore, that the control room tube divides the control chamber bore into a control chamber surrounding the high-pressure part and a provided within the control room tube control chamber part, which forms the control chamber, and that the filler in the Control chamber part of the control chamber bore is arranged.
  • the nozzle needle may be guided in the control room tube.
  • the control chamber tube is acted upon by a nozzle spring, which is supported on the one hand on the control chamber tube and on the other hand on the nozzle needle.
  • Fig. 1 shows a fuel injection valve 1 in a schematic sectional view according to a first embodiment of the invention.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 has a multi-part valve housing 2, which in this embodiment comprises a nozzle body 3, a holding body 4 and a head-side housing part 5.
  • the nozzle body 3, the holding body 4 and the head-side housing part 5 are connected to each other in a suitable manner.
  • the holding body 4 is at least partially disposed in the mounted state within a bore of an internal combustion engine.
  • the head-side housing part 5 is arranged outside the bore, so that it can be made relatively large. This results in favorable installation conditions for components of the fuel injection valve 1, which are provided in the head-side housing part 5.
  • a switching valve 6 is arranged, which may have a magnetic actuator, a piezoelectric actuator or another actuator.
  • the valve housing 2 of the fuel injection valve 1 has a fuel inlet 7, which is connected for example to a common rail. From the fuel inlet 7 branches off a fuel channel 8, which is guided by the holding body 4 and opens into a further fuel channel 9 in the nozzle body 3. In the nozzle body 3, a fuel chamber 10 is formed, which is filled via the fuel channels 8, 9 in operation with fuel under high pressure.
  • the nozzle body 3 has a valve seat surface 11 which cooperates with a valve closing body 12 of a nozzle needle 13 arranged in the nozzle needle 13 to a sealing seat. When opening the nozzle needle 13 along an axis 14 of the sealing seat is released, so that fuel from the fuel chamber 10 via at least one nozzle opening 15 is hosed. The actuation of the nozzle needle 13 is described below in further detail.
  • the holding body 4 has a control space bore 20 which extends along the axis 14 substantially over the entire length of the holding body 4.
  • an inlet throttle 21 is provided at the head end of the control chamber bore 20, via the fuel from the fuel inlet 7 into the control chamber bore 20 can be guided.
  • an outlet throttle 22 is provided.
  • the outlet throttle 22 can be connected via the arranged in the head-side housing part 5 switching valve 6 with a fuel return 23, which leads to a tank 24. The connection is controllable via the switching valve 6.
  • the nozzle needle 13 has an end face 25 which defines a control chamber 26 together with the control chamber bore 20.
  • an inflow from the inlet throttle 21 and an outflow of fuel via the outlet throttle 22 is given in a head-side part 27 of the control chamber 26.
  • a filler 30 is arranged, which extends almost over the entire length of the control chamber bore 20. Between the control chamber bore 20 and the filler 30, an annular gap-shaped part 28 of the control chamber 26 is formed. Furthermore, the control chamber 26 has a nozzle-side part 29. Through the filler 30, the fuel-filled volume of the control chamber bore 20 is significantly reduced.
  • the filler 30 is formed of a solid, preferably a steel.
  • the filler 30 Since the compression modulus of steel is significantly greater than the compression modulus of diesel fuel or the like, the filler 30 does not contribute to the elasticity of the control space 26 practically. Thereby can be achieved without direct mechanical power transmission even with a relatively large spatial distance between the arranged in the head-side housing part 5 switching valve 6 and the nozzle body 3 arranged in the nozzle needle 13 a rigid connection of the nozzle needle 13 to the switching valve.
  • the pressure builds up in the head-side part 27 and thus also in the nozzle-side part 29 of the control chamber 26 again.
  • a closing force acts on the end face 25 of the nozzle needle 13 and is supported by the force of a nozzle spring 35 arranged in the nozzle-side part 29 of the control chamber 26.
  • the nozzle spring 35 also ensures an axial fixation of the filler piece 30.
  • the filler piece 30 has a shoulder 36 which rests against a nozzle-body-side step 37 of the control chamber bore 20.
  • the nozzle spring 35 presses the shoulder 36 against the nozzle body-side stage 37.
  • Fig. 2 shows the in Fig. 1 labeled II section of a fuel injection valve according to a second embodiment of the invention.
  • the filler 30 has a head portion 39, on which a shoulder 36 is provided.
  • a nozzle spring 35 is located on the one hand on the nozzle body side step 37 of the control chamber bore 20 and on the other hand on the shoulder 36 of the head portion 39 of the filler 30 at.
  • the filler 30 is pressed with its head part 39 against the end face 25 of the nozzle needle 13.
  • the filler 30 is arranged axially displaceable, so that it follows the movement of the nozzle needle 13.
  • the nozzle spring 35 acts on the nozzle needle 13 in the direction of the valve seat surface 11.
  • the filler 30 at a be positioned lower stop, which is given in this embodiment by the end face 25 of the nozzle needle 13.
  • Fig. 3 shows the in Fig. 1 labeled III section of a fuel injection valve 1 according to a third embodiment of the invention.
  • the filling piece 30 has at least one section 40, in which at least one edge 41 is formed on the filling piece 30. With the edge 41, the filler 30 is pressed against the control chamber bore 20, so that a fixation of the filler 30 in the axial direction, that is along the axis 14, is given.
  • Fig. 4 shows the in Fig. 3 labeled IV section of the fuel injection valve 1 of the third embodiment.
  • the filling piece 30 has a triangular cross-section in the section 40, so that the edges 41, 42, 43 are formed. In the region of the edges 41, 42, 43 while a press fit between the filler 30 and the control chamber bore is formed.
  • the section 40 can be configured, for example, by grinding on the filler 30.
  • Fig. 5 shows a fuel injection valve 1 in a schematic sectional view according to a fourth embodiment of the invention.
  • a control room tube 50 is provided.
  • the control room tube 50 is arranged in the holding body 4 of the valve housing 2.
  • the control chamber tube 50 is introduced into the control chamber bore 20, the control chamber 50, the control chamber bore 50 in a surrounding the control chamber 50 high-pressure part 51, which is designed ringpaltförmig, and a provided within the control chamber tube 50 control chamber part divides, which forms the control chamber 26.
  • the filler 30 is arranged within the control space tube 50, that is, in the control chamber 26, the filler 30 is arranged.
  • the filler 30 is designed substantially rod-shaped and cylindrical.
  • the inlet throttle 21, via which high-pressure fuel can flow into the head-side part 27 of the control chamber 26, is in this embodiment in the region of the head-side part 27 in the control chamber tube 50 designed. This can be done for example by a hole in the control room tube 50.
  • the nozzle needle 13 has a pressure pin 52, with which the nozzle needle 13 is axially guided in the control chamber tube 50.
  • the pressure pin 52 is designed in one piece with the nozzle needle 13.
  • the nozzle spring 35 is placed on the pressure pin 52.
  • the nozzle spring 35 is supported, on the one hand, on the control space pipe 50 and, on the other hand, on the nozzle needle 13.
  • the pressure of the fuel in the control chamber 26 acts in the region of the nozzle-side part 29 of the control chamber 26 on the end face 25 of the nozzle needle 13, which is formed in this embodiment by the end face 25 of the pressure pin 52.

Abstract

The fuel injection valve (1) has a switching valve (6) which is arranged in a top end housing part and a nozzle body (3) which is connected with the top end housing part over a retaining body. A nozzle needle (13) is arranged in the nozzle body. The retaining body has a control chamber bore (20) with a front surface (25) of the nozzle needle, which limits a control chamber (26). A filler piece (30) is arranged in the control chamber.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Brennstoffeinspritzventil mit einem kopfseitig angeordneten Schaltventil. Speziell betrifft die Erfindung das Gebiet der Injektoren für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen.The invention relates to a fuel injection valve with a switching valve arranged on the head side. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.

Aus der DE 199 56 522 A1 ist ein Injektor zum Einspritzen eines unter hohem Druck stehenden Fluids mittels einer Düse bekannt. Der bekannte Injektorkörper umfasst eine Hochdruckzulaufleitung sowie einen drucklosen Ablauf. Ferner enthält der Injektorkörper ein Magnetventil, welches zur Ansteuerung der Düse dient. In dem Injektorkörper ist eine sich axial erstreckende Hülse bewegbar aufgenommen, deren eine Stirnseite mittels eines Ventils ansteuerbar ist und deren andere Stirnseite einen Steuerraum begrenzt, in welchen ein Abzweig eines Hochdruckzulaufs mündet.From the DE 199 56 522 A1 For example, an injector for injecting a high-pressure fluid through a nozzle is known. The known injector body comprises a high-pressure inlet line and a non-pressurized outlet. Furthermore, the injector body contains a solenoid valve, which serves to control the nozzle. In the injector, an axially extending sleeve is movably received, whose one end face is actuated by means of a valve and the other end face defines a control chamber into which a branch of a high-pressure inlet opens.

Der aus der DE 199 56 522 A1 bekannte Injektor hat den Nachteil, dass die Ausgestaltung relativ aufwändig ist. Speziell hat in einem Durchmesserbereich, der sich im Injektorkörper von einer Ablaufdrossel im oberen Bereich zu einem Kegelsitzanschlag im Bereich der Düse erstreckt, die Hülse im Injektorkörper ein Spiel von mehr als 0,01 mm, wobei der Durchmesser der Bohrung in der sich axial erstreckenden Hülse im Bereich von 1,5 mm liegt. Und in dem sich vom Kegelsitzanschlag bis zur Hülsenstirnseite erstreckenden Durchmesserbereich ist die Hülse annähernd spielfrei gelagert und zwar mit einem Spiel von weniger als 0,01 mm, was sehr hohe Anforderungen an die Rundlaufgenauigkeit und die Bearbeitungsgüte des Hülsenbauteils stellt.The from the DE 199 56 522 A1 known injector has the disadvantage that the design is relatively complex. Specifically, in a diameter range extending in the injector body from an upper end flow restrictor to a conical seat stop near the nozzle, the sleeve in the injector body has a clearance of more than 0.01 mm, the diameter of the bore in the axially extending sleeve in the range of 1.5 mm. And in the diameter range extending from the conical seat stop to the sleeve end face, the sleeve is mounted approximately free of play and indeed with a clearance of less than 0.01 mm, which places very high demands on the concentricity and the machining quality of the sleeve component.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Herstellbarkeit, insbesondere in Bezug auf eine Steuerraumbohrung, verbessert ist, wobei eine kopfseitige Anordnung des Schaltventils in dem Brennstoffeinspritzventil möglich ist.The fuel injection valve according to the invention with the features of claim 1 has the advantage that the manufacturability, in particular with respect to a control chamber bore, is improved, wherein a head-side arrangement of the switching valve in the fuel injection valve is possible.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruchs 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in claim 1 are possible.

Vorteilhaft ist es, dass das Füllstück zumindest abschnittsweise stabförmig ausgestaltet ist und dass sich das Füllstück zumindest abschnittsweise durch die Steuerraumbohrung des Haltekörpers erstreckt. Dabei kann das Füllstück in der Steuerraumbohrung abschnittsweise einen drei- oder mehreckigen Querschnitt aufweisen, so dass eine oder mehrere Haltekanten gebildet sind. Mit der Haltekante kann das Füllstück eine Presspassung mit der Steuerraumbohrung bilden, um eine zuverlässige Befestigung des Füllstücks in der Steuerraumbohrung zu erzielen. Dadurch ist das Füllstück in axialer Richtung fixiert.It is advantageous that the filler is at least partially configured rod-shaped and that the filler at least partially extends through the control chamber bore of the holding body. In this case, the filler in the control chamber bore sections have a three- or polygonal cross-section, so that one or more retaining edges are formed. With the retaining edge, the filler can form an interference fit with the control chamber bore in order to achieve a reliable attachment of the filler in the control chamber bore. As a result, the filler is fixed in the axial direction.

Andererseits kann es auch vorteilhaft sein, dass das Füllstück in der Steuerraumbohrung axial verschiebbar ist. Dies hat den Vorteil, dass sich Druckänderungen, die von dem Schaltventil zum Ansteuern der Düsennadel erzeugt sind, auch oder sogar im Wesentlichen in einer Verschiebung des Füllstücks in der Steuerraumbohrung auswirken. Dadurch kann eine Drosselwirkung reduziert werden, die auftritt, wenn sich die Druckänderung durch den Spalt zwischen dem Füllstück und der Steuerraumbohrung fortpflanzt.On the other hand, it may also be advantageous that the filler in the control chamber bore is axially displaceable. This has the advantage that pressure changes, which are generated by the switching valve for driving the nozzle needle, also or even substantially affect a displacement of the filler in the control chamber bore. Thereby, a throttle effect that occurs when the pressure change propagates through the gap between the filler and the control space bore can be reduced.

Dabei ist besonders vorteilhaft eine Dimensionierung, bei der der Durchmesser der Steuerraumbohrung eine ähnliche oder dieselbe Größe aufweist wie der Durchmesser jenes Teils der Düsennadel, der in den Steuerraum eintaucht, wobei zudem das Füllstück in der Steuerraumbohrung axial verschiebbar angeordnet ist und sich im Ruhezustand nicht an einem oberen Anschlag befindet. In diesem Fall entsteht beim Öffnen und Schließen der Düsennadel nur ein geringer oder gar kein Volumenstrom in dem schmalen Spalt zwischen dem Füllstück und der Innenwand der Steuerraumbohrung, sondern das Füllstück bewegt sich analog zur Düsennadel nach oben und unten, so dass nur wenig oder gar kein Brennstoff vom düsenseitig des Füllstücks befindlichen Teil des Steuerraums in den steuerventilseitig befindlichen Teil oder umgekehrt verbracht werden muss. Somit unterbleiben auch Drosseleffekte in dem schmalen Spalt zwischen der Innenwand der Steuerraumbohrung und dem Füllstück und der Druck im Steuerraum kann weitgehend als einheitlich betrachtet werden.In this case, a dimensioning is particularly advantageous in which the diameter of the control chamber bore has a similar or the same size as the diameter of that part of the nozzle needle which dips into the control chamber, wherein also the filler is arranged axially displaceable in the control chamber bore and not at rest an upper stop. In this case arises when opening and closing the nozzle needle only a small or no flow in the narrow gap between the filler and the inner wall of the control chamber bore, but the filler moves analogously to the nozzle needle up and down, so that little or no Fuel from the nozzle side of the filler located portion of the control chamber in the control valve side part or vice versa must be spent. Thus, throttle effects in the narrow gap between the inner wall of the control chamber bore and the filler and the pressure in the control chamber are also eliminated can largely be considered as uniform.

Bei dieser Ausgestaltung kann das Füllstück nur in die Steuerraumbohrung eingelegt werden, so dass es darin axial verschiebbar bleibt.In this embodiment, the filler can be inserted only in the control chamber bore, so that it remains axially displaceable therein.

Vorteilhaft ist es, dass ein Federelement vorgesehen ist, dass das Füllstück einen Absatz aufweist, dass das Füllstück an seinem Absatz an einer düsenkörperseitigen Stufe der Steuerraumbohrung anliegt und dass das Federelement das Füllstück gegen die düsenkörperseitige Stufe presst. Dadurch kann das Füllstück mit der Vorspannung des Federelements beaufschlagt werden, um eine axiale Fixierung des Füllstücks zu erzielen. Dabei kann sich das Federelement an der Stirnfläche der Düsennadel abstützen, wodurch zusätzlich eine Beaufschlagung der Düsennadel möglich ist, die gegebenenfalls eine Rückstellkraft auf die Düsennadel ausübt.It is advantageous that a spring element is provided, that the filler has a shoulder, that the filler abuts at its shoulder on a nozzle body side stage of the control chamber bore and that the spring element presses the filler against the nozzle body side stage. As a result, the filler can be acted upon by the bias of the spring element in order to achieve an axial fixation of the filler. In this case, the spring element can be supported on the end face of the nozzle needle, whereby in addition a loading of the nozzle needle is possible, which optionally exerts a restoring force on the nozzle needle.

Vorteilhaft ist es auch, dass eine Düsenfeder vorgesehen ist, die einerseits an einer Stufe der Steuerraumbohrung und andererseits an einem Absatz des Füllstücks abgestützt ist, und dass die Düsenfeder das Füllstück gegen die Stirnfläche der Düsennadel presst. Dadurch kann eine Anlage des Füllstücks an der Düsennadel erzielt werden. Dadurch ist eine vorteilhafte Kraftübertragung von dem axial bewegbaren Füllstück auf die Düsennadel möglich. Außerdem kann die Düsenfeder eine Rückstellkraft auf die Düsennadel zum Schließen des Brennstoffeinspritzventils ausüben.It is also advantageous that a nozzle spring is provided, which is supported on the one hand at a stage of the control chamber bore and on the other hand on a shoulder of the filler, and that the nozzle spring presses the filler against the end face of the nozzle needle. As a result, a plant of the filler can be achieved on the nozzle needle. As a result, an advantageous power transmission from the axially movable filler to the nozzle needle is possible. In addition, the nozzle spring can exert a restoring force on the nozzle needle for closing the fuel injection valve.

Vorteilhaft ist es, dass ein Steuerraumrohr vorgesehen ist, das zumindest teilweise in der Steuerraumbohrung angeordnet ist, dass das Steuerraumrohr die Steuerraumbohrung in einen das Steuerraumrohr umgebenden Hochdruckteil und einen innerhalb des Steuerraumrohrs vorgesehenen Steuerraumteil aufteilt, der den Steuerraum bildet, und dass das Füllstück in dem Steuerraumteil der Steuerraumbohrung angeordnet ist. Dabei kann die Düsennadel in dem Steuerraumrohr geführt sein. Dabei ist es ferner vorteilhaft, dass das Steuerraumrohr von einer Düsenfeder beaufschlagt ist, die sich einerseits an dem Steuerraumrohr und andererseits an der Düsennadel abstützt.It is advantageous that a control chamber tube is provided which is at least partially disposed in the control chamber bore, that the control room tube divides the control chamber bore into a control chamber surrounding the high-pressure part and a provided within the control room tube control chamber part, which forms the control chamber, and that the filler in the Control chamber part of the control chamber bore is arranged. In this case, the nozzle needle may be guided in the control room tube. It is also advantageous that the control chamber tube is acted upon by a nozzle spring, which is supported on the one hand on the control chamber tube and on the other hand on the nozzle needle.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung anhand der beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:

  • Fig. 1 ein Brennstoffeinspritzventil in einer schematischen Schnittdarstellung entsprechend einem ersten Ausführungsbeispiel der Erfindung.
  • Fig. 2 den in Fig. 1 mit II bezeichneten Ausschnitt eines Brennstoffeinspritzventils entsprechend einem zweiten Ausführungsbeispiel der Erfindung;
  • Fig. 3 den in Fig. 1 mit III bezeichneten Ausschnitt eines Brennstoffeinspritzventils entsprechend einem dritten Ausführungsbeispiel der Erfindung;
  • Fig. 4 einen auszugsweisen Schnitt durch das in Fig. 3 dargestellte Brennstoffeinspritzventil entlang der mit IV bezeichneten Schnittlinie und
  • Fig. 5 ein Brennstoffeinspritzventil in einer schematischen Schnittdarstellung entsprechend einem vierten Ausführungsbeispiel der Erfindung.
Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. It shows:
  • Fig. 1 a fuel injection valve in a schematic sectional view according to a first embodiment of the invention.
  • Fig. 2 the in Fig. 1 labeled II section of a fuel injection valve according to a second embodiment of the invention;
  • Fig. 3 the in Fig. 1 labeled III section of a fuel injection valve according to a third embodiment of the invention;
  • Fig. 4 an excerpted section through the in Fig. 3 represented fuel injection valve along the IV line and designated
  • Fig. 5 a fuel injection valve in a schematic sectional view according to a fourth embodiment of the invention.

Ausführungsformen der ErfindungEmbodiments of the invention

Fig. 1 zeigt ein Brennstoffeinspritzventil 1 in einer schematischen Schnittdarstellung entsprechend einem ersten Ausführungsbeispiel der Erfindung. Das Brennstoffeinspritzventil 1 kann insbesondere als Injektor für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen dienen. Ein bevorzugter Einsatz des Brennstoffeinspritzventils 1 besteht für eine Brennstoffeinspritzanlage mit einem Common-Rail, das Dieselbrennstoff unter hohem Druck zu mehreren Brennstoffeinspritzventilen 1 führt. Das erfindungsgemäße Brennstoffeinspritzventil 1 eignet sich jedoch auch für andere Anwendungsfälle. Fig. 1 shows a fuel injection valve 1 in a schematic sectional view according to a first embodiment of the invention. The fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines. A preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1. However, the fuel injection valve 1 according to the invention is also suitable for other applications.

Das Brennstoffeinspritzventil 1 weist ein mehrteiliges Ventilgehäuse 2 auf, das in diesem Ausführungsbeispiel einen Düsenkörper 3, einen Haltekörper 4 und einen kopfseitigen Gehäuseteil 5 umfasst. Dabei sind der Düsenkörper 3, der Haltekörper 4 und der kopfseitige Gehäuseteil 5 auf geeignete Weise miteinander verbunden. Der Haltekörper 4 ist im montierten Zustand zumindest teilweise innerhalb einer Bohrung einer Brennkraftmaschine angeordnet. Der kopfseitige Gehäuseteil 5 ist außerhalb der Bohrung angeordnet, so dass er relativ groß ausgestaltet sein kann. Dadurch ergeben sich günstige Einbauverhältnisse für Komponenten des Brennstoffeinspritzventils 1, die in dem kopfseitigen Gehäuseteil 5 vorgesehen sind. In dem kopfseitigen Gehäuseteil 5 ist insbesondere ein Schaltventil 6 angeordnet, das einen Magnetaktor, einen Piezoaktor oder ein anderes Betätigungselement aufweisen kann.The fuel injection valve 1 has a multi-part valve housing 2, which in this embodiment comprises a nozzle body 3, a holding body 4 and a head-side housing part 5. In this case, the nozzle body 3, the holding body 4 and the head-side housing part 5 are connected to each other in a suitable manner. The holding body 4 is at least partially disposed in the mounted state within a bore of an internal combustion engine. The head-side housing part 5 is arranged outside the bore, so that it can be made relatively large. This results in favorable installation conditions for components of the fuel injection valve 1, which are provided in the head-side housing part 5. In the head-side housing part 5 is In particular, a switching valve 6 is arranged, which may have a magnetic actuator, a piezoelectric actuator or another actuator.

Das Ventilgehäuse 2 des Brennstoffeinspritzventils 1 weist einen Brennstoffzulauf 7 auf, der beispielsweise mit einem Common-Rail verbunden ist. Von dem Brennstoffzulauf 7 zweigt ein Brennstoffkanal 8 ab, der durch den Haltekörper 4 geführt ist und in einen weiteren Brennstoffkanal 9 in dem Düsenkörper 3 mündet. In dem Düsenkörper 3 ist ein Brennstoffraum 10 ausgebildet, der über die Brennstoffkanäle 8, 9 im Betrieb mit unter hohem Druck stehenden Brennstoff gefüllt wird. Der Düsenkörper 3 weist eine Ventilsitzfläche 11 auf, die mit einem Ventilschließkörper 12 einer in dem Düsenkörper 3 angeordneten Düsennadel 13 zu einem Dichtsitz zusammenwirkt. Bei einem Öffnen der Düsennadel 13 entlang einer Achse 14 wird der Dichtsitz freigegeben, so dass Brennstoff aus dem Brennstoffraum 10 über zumindest eine Düsenöffnung 15 abgespritzt wird. Die Betätigung der Düsennadel 13 ist im Folgenden im weiteren Detail beschrieben.The valve housing 2 of the fuel injection valve 1 has a fuel inlet 7, which is connected for example to a common rail. From the fuel inlet 7 branches off a fuel channel 8, which is guided by the holding body 4 and opens into a further fuel channel 9 in the nozzle body 3. In the nozzle body 3, a fuel chamber 10 is formed, which is filled via the fuel channels 8, 9 in operation with fuel under high pressure. The nozzle body 3 has a valve seat surface 11 which cooperates with a valve closing body 12 of a nozzle needle 13 arranged in the nozzle needle 13 to a sealing seat. When opening the nozzle needle 13 along an axis 14 of the sealing seat is released, so that fuel from the fuel chamber 10 via at least one nozzle opening 15 is hosed. The actuation of the nozzle needle 13 is described below in further detail.

Der Haltekörper 4 weist eine Steuerraumbohrung 20 auf, die sich entlang der Achse 14 im Wesentlichen über die gesamte Länge des Haltekörpers 4 erstreckt. Dabei ist am kopfseitigen Ende der Steuerraumbohrung 20 eine Zulaufdrossel 21 vorgesehen, über die Brennstoff aus dem Brennstoffzulauf 7 in die Steuerraumbohrung 20 führbar ist. Außerdem ist eine Ablaufdrossel 22 vorgesehen. Die Ablaufdrossel 22 ist über das in dem kopfseitigen Gehäuseteil 5 angeordnete Schaltventil 6 mit einem Brennstoffrücklauf 23 verbindbar, der zu einem Tank 24 führt. Die Verbindung ist dabei über das Schaltventil 6 steuerbar.The holding body 4 has a control space bore 20 which extends along the axis 14 substantially over the entire length of the holding body 4. In this case, an inlet throttle 21 is provided at the head end of the control chamber bore 20, via the fuel from the fuel inlet 7 into the control chamber bore 20 can be guided. In addition, an outlet throttle 22 is provided. The outlet throttle 22 can be connected via the arranged in the head-side housing part 5 switching valve 6 with a fuel return 23, which leads to a tank 24. The connection is controllable via the switching valve 6.

Die Düsennadel 13 weist eine Stirnfläche 25 auf, die zusammen mit der Steuerraumbohrung 20 einen Steuerraum 26 begrenzt. Dabei ist in einem kopfseitigen Teil 27 des Steuerraums 26 ein Zufluss von der Zulaufdrossel 21 und ein Abfluss von Brennstoff über die Ablaufdrossel 22 gegeben. In dem Steuerraum 26 ist ein Füllstück 30 angeordnet, das sich fast über die gesamte Länge der Steuerraumbohrung 20 erstreckt. Zwischen der Steuerraumbohrung 20 und dem Füllstück 30 ist ein ringspaltförmiger Teil 28 des Steuerraums 26 ausgebildet. Ferner weist der Steuerraum 26 einen düsenseitigen Teil 29 auf. Durch das Füllstück 30 ist das mit Brennstoff gefüllte Volumen der Steuerraumbohrung 20 erheblich reduziert. Das Füllstück 30 ist aus einem Feststoff, vorzugsweise aus einem Stahl, ausgebildet. Da das Kompressionsmodul von Stahl erheblich größer ist als das Kompressionsmodul von Dieselbrennstoff oder dergleichen, trägt das Füllstück 30 praktisch nicht zur Elastizität des Steuerraums 26 bei. Dadurch kann auch bei einem relativ großen räumlichen Abstand zwischen dem in dem kopfseitigen Gehäuseteil 5 angeordneten Schaltventil 6 und der im Düsenkörper 3 angeordneten Düsennadel 13 eine steife Anbindung der Düsennadel 13 an das Schaltventil 6 ohne direkte mechanische Kraftübertragung erreicht werden.The nozzle needle 13 has an end face 25 which defines a control chamber 26 together with the control chamber bore 20. In this case, an inflow from the inlet throttle 21 and an outflow of fuel via the outlet throttle 22 is given in a head-side part 27 of the control chamber 26. In the control chamber 26, a filler 30 is arranged, which extends almost over the entire length of the control chamber bore 20. Between the control chamber bore 20 and the filler 30, an annular gap-shaped part 28 of the control chamber 26 is formed. Furthermore, the control chamber 26 has a nozzle-side part 29. Through the filler 30, the fuel-filled volume of the control chamber bore 20 is significantly reduced. The filler 30 is formed of a solid, preferably a steel. Since the compression modulus of steel is significantly greater than the compression modulus of diesel fuel or the like, the filler 30 does not contribute to the elasticity of the control space 26 practically. Thereby can be achieved without direct mechanical power transmission even with a relatively large spatial distance between the arranged in the head-side housing part 5 switching valve 6 and the nozzle body 3 arranged in the nozzle needle 13 a rigid connection of the nozzle needle 13 to the switching valve.

Durch Öffnen der Ablaufdrossel 22 fällt der Druck im kopfseitigen Teil 27 des Steuerraums 26 ab, wobei dieser Druckabfall auf Grund des reduzierten Volumens des Steuerraums 26 relativ direkt zu einem Druckabfall im düsenseitigen Teil 29 des Steuerraums 26 führt. Durch den Druckabfall im Bereich der Stirnfläche 25 wird die in Richtung des Dichtsitzes wirkende Schließkraft der Düsennadel 13 erheblich reduziert, so dass sich die Düsennadel 13 aus ihrem Sitz hebt und Brennstoff über die Düsenöffnung 15 abgespritzt wird.By opening the outlet throttle 22, the pressure drops in the head-side part 27 of the control chamber 26, this pressure drop due to the reduced volume of the control chamber 26 leads relatively directly to a pressure drop in the nozzle-side part 29 of the control chamber 26. Due to the pressure drop in the area of the end face 25, the closing force of the nozzle needle 13 acting in the direction of the sealing seat is considerably reduced, so that the nozzle needle 13 lifts out of its seat and fuel is sprayed off via the nozzle opening 15.

Nach dem Schließen der Ablaufdrossel 22 mittels des Schaltventils 6 baut sich der Druck im kopfseitigen Teil 27 und somit auch im düsenseitigen Teil 29 des Steuerraums 26 wieder auf. Dadurch wirkt über die Stirnfläche 25 der Düsennadel 13 eine Schließkraft, die von der Kraft einer im düsenseitigen Teil 29 des Steuerraums 26 angeordneten Düsenfeder 35 unterstützt wird. Die Düsenfeder 35 gewährleistet dabei auch eine axiale Fixierung des Füllstücks 30. Hierfür weist das Füllstück 30 einen Absatz 36 auf, der an einer düsenkörperseitigen Stufe 37 der Steuerraumbohrung 20 anliegt. Die Düsenfeder 35 presst den Absatz 36 gegen die düsenkörperseitige Stufe 37. Um den Durchfluss aus dem ringspaltförmigen Teil 28 des Steuerraums 26 in den düsenseitigen Teil 29 des Steuerraums 26 zu gewährleisten, ist zumindest eine Durchlassöffnung in Form einer Aussparung oder dergleichen an der Stufe 37 vorgesehen.After closing the outlet throttle 22 by means of the switching valve 6, the pressure builds up in the head-side part 27 and thus also in the nozzle-side part 29 of the control chamber 26 again. As a result, a closing force acts on the end face 25 of the nozzle needle 13 and is supported by the force of a nozzle spring 35 arranged in the nozzle-side part 29 of the control chamber 26. In this case, the nozzle spring 35 also ensures an axial fixation of the filler piece 30. For this purpose, the filler piece 30 has a shoulder 36 which rests against a nozzle-body-side step 37 of the control chamber bore 20. The nozzle spring 35 presses the shoulder 36 against the nozzle body-side stage 37. In order to ensure the flow from the annular gap-shaped part 28 of the control chamber 26 into the nozzle-side part 29 of the control chamber 26, at least one passage opening in the form of a recess or the like is provided on the step 37 ,

Fig. 2 zeigt den in Fig. 1 mit II bezeichneten Ausschnitt eines Brennstoffeinspritzventils entsprechend einem zweiten Ausführungsbeispiel der Erfindung. In diesem Ausführungsbeispiel weist das Füllstück 30 ein Kopfteil 39 auf, an dem ein Absatz 36 vorgesehen ist. Dabei liegt eine Düsenfeder 35 einerseits an der düsenkörperseitigen Stufe 37 der Steuerraumbohrung 20 und andererseits an dem Absatz 36 des Kopfteils 39 des Füllstücks 30 an. Dadurch wird das Füllstück 30 mit seinem Kopfteil 39 gegen die Stirnfläche 25 der Düsennadel 13 gepresst. Das Füllstück 30 ist axial verschiebbar angeordnet, so dass es der Bewegung der Düsennadel 13 folgt. Die Düsenfeder 35 beaufschlagt dabei die Düsennadel 13 in Richtung auf die Ventilsitzfläche 11. Fig. 2 shows the in Fig. 1 labeled II section of a fuel injection valve according to a second embodiment of the invention. In this embodiment, the filler 30 has a head portion 39, on which a shoulder 36 is provided. In this case, a nozzle spring 35 is located on the one hand on the nozzle body side step 37 of the control chamber bore 20 and on the other hand on the shoulder 36 of the head portion 39 of the filler 30 at. As a result, the filler 30 is pressed with its head part 39 against the end face 25 of the nozzle needle 13. The filler 30 is arranged axially displaceable, so that it follows the movement of the nozzle needle 13. The nozzle spring 35 acts on the nozzle needle 13 in the direction of the valve seat surface 11.

Bei dem in der Fig. 2 dargestellten Ausführungsbeispiel kann das Füllstück 30 an einem unteren Anschlag positioniert sein, der in diesem Ausführungsbeispiel durch die Stirnfläche 25 der Düsennadel 13 gegeben ist.In the in the Fig. 2 illustrated embodiment, the filler 30 at a be positioned lower stop, which is given in this embodiment by the end face 25 of the nozzle needle 13.

Fig. 3 zeigt den in Fig. 1 mit III bezeichneten Ausschnitt eines Brennstoffeinspritzventils 1 entsprechend einem dritten Ausführungsbeispiel der Erfindung. In diesem Ausführungsbeispiel weist das Füllstück 30 zumindest einen Abschnitt 40 auf, in dem zumindest eine Kante 41 an dem Füllstück 30 ausgebildet ist. Mit der Kante 41 ist das Füllstück 30 dabei gegen die Steuerraumbohrung 20 gepresst, so dass eine Fixierung des Füllstücks 30 in axialer Richtung, das heißt entlang der Achse 14, gegeben ist. Fig. 3 shows the in Fig. 1 labeled III section of a fuel injection valve 1 according to a third embodiment of the invention. In this embodiment, the filling piece 30 has at least one section 40, in which at least one edge 41 is formed on the filling piece 30. With the edge 41, the filler 30 is pressed against the control chamber bore 20, so that a fixation of the filler 30 in the axial direction, that is along the axis 14, is given.

Fig. 4 zeigt den in Fig. 3 mit IV bezeichneten Ausschnitt des Brennstoffeinspritzventils 1 des dritten Ausführungsbeispiels. Das Füllstück 30 weist in dem Abschnitt 40 einen dreieckigen Querschnitt auf, so dass die Kanten 41, 42, 43 gebildet sind. Im Bereich der Kanten 41, 42, 43 ist dabei eine Presspassung zwischen dem Füllstück 30 und der Steuerraumbohrung gebildet. Der Abschnitt 40 kann beispielsweise durch Anschliffe an dem Füllstück 30 ausgestaltet werden. Fig. 4 shows the in Fig. 3 labeled IV section of the fuel injection valve 1 of the third embodiment. The filling piece 30 has a triangular cross-section in the section 40, so that the edges 41, 42, 43 are formed. In the region of the edges 41, 42, 43 while a press fit between the filler 30 and the control chamber bore is formed. The section 40 can be configured, for example, by grinding on the filler 30.

Fig. 5 zeigt ein Brennstoffeinspritzventil 1 in einer schematischen Schnittdarstellung entsprechend einem vierten Ausführungsbeispiel der Erfindung. In diesem Ausführungsbeispiel ist ein Steuerraumrohr 50 vorgesehen. Das Steuerraumrohr 50 ist in dem Haltekörper 4 des Ventilgehäuses 2 angeordnet. Dabei ist das Steuerraumrohr 50 in die Steuerraumbohrung 20 eingebracht, wobei das Steuerraumrohr 50 die Steuerraumbohrung 50 in einen das Steuerraumrohr 50 umgebenden Hochdruckteil 51, der ringspaltförmig ausgestaltet ist, und einen innerhalb des Steuerraumrohrs 50 vorgesehenen Steuerraumteil aufteilt, der den Steuerraum 26 bildet. Ferner ist innerhalb des Steuerraumrohres 50, das heißt in dem Steuerraum 26, das Füllstück 30 angeordnet. Das Füllstück 30 ist dabei im Wesentlichen stabförmig und zylindrisch ausgestaltet. Zwischen dem Füllstück 30 und dem Steuerraumrohr 50 ist ein ringspaltförmiger Teil 28 des Steuerraums 26 gebildet. Somit ist das für den Brennstoff verbleibende Volumen des Steuerraumteils der Steuerraumbohrung 20 im Inneren des Steuerraumrohrs 50 erheblich reduziert, so dass sich auch bei einem relativ langen Steuerraumrohr 50 ein relativ kleines Volumen des Steuerraums 26 ergibt. Fig. 5 shows a fuel injection valve 1 in a schematic sectional view according to a fourth embodiment of the invention. In this embodiment, a control room tube 50 is provided. The control room tube 50 is arranged in the holding body 4 of the valve housing 2. In this case, the control chamber tube 50 is introduced into the control chamber bore 20, the control chamber 50, the control chamber bore 50 in a surrounding the control chamber 50 high-pressure part 51, which is designed ringpaltförmig, and a provided within the control chamber tube 50 control chamber part divides, which forms the control chamber 26. Further, within the control space tube 50, that is, in the control chamber 26, the filler 30 is arranged. The filler 30 is designed substantially rod-shaped and cylindrical. Between the filler 30 and the control chamber tube 50 an annular gap-shaped part 28 of the control chamber 26 is formed. Thus, the remaining for the fuel volume of the control chamber portion of the control chamber bore 20 is significantly reduced in the interior of the control chamber tube 50, so that even with a relatively long control chamber tube 50, a relatively small volume of the control chamber 26 results.

Die Zulaufdrossel 21, über die unter hohem Druck stehender Brennstoff in den kopfseitigen Teil 27 des Steuerraums 26 einströmen kann, ist in diesem Ausführungsbeispiel im Bereich des kopfseitigen Teils 27 in dem Steuerraumrohr 50 ausgestaltet. Dies kann beispielsweise durch eine Bohrung in dem Steuerraumrohr 50 erfolgen.The inlet throttle 21, via which high-pressure fuel can flow into the head-side part 27 of the control chamber 26, is in this embodiment in the region of the head-side part 27 in the control chamber tube 50 designed. This can be done for example by a hole in the control room tube 50.

In diesem Ausführungsbeispiel weist die Düsennadel 13 einen Druckzapfen 52 auf, mit dem die Düsennadel 13 in dem Steuerraumrohr 50 axial geführt ist. Dabei ist der Druckzapfen 52 einteilig mit der Düsennadel 13 ausgestaltet. Ferner ist die Düsenfeder 35 auf den Druckzapfen 52 aufgefügt. Dabei stützt sich die Düsenfeder 35 einerseits an dem Steuerraumrohr 50 und andererseits an der Düsennadel 13 ab. Der Druck des Brennstoffes im Steuerraum 26 wirkt im Bereich des düsenseitigen Teils 29 des Steuerraums 26 auf die Stirnfläche 25 der Düsennadel 13, die in diesem Ausführungsbeispiel durch die Stirnfläche 25 des Druckzapfens 52 gebildet ist.In this embodiment, the nozzle needle 13 has a pressure pin 52, with which the nozzle needle 13 is axially guided in the control chamber tube 50. In this case, the pressure pin 52 is designed in one piece with the nozzle needle 13. Furthermore, the nozzle spring 35 is placed on the pressure pin 52. In this case, the nozzle spring 35 is supported, on the one hand, on the control space pipe 50 and, on the other hand, on the nozzle needle 13. The pressure of the fuel in the control chamber 26 acts in the region of the nozzle-side part 29 of the control chamber 26 on the end face 25 of the nozzle needle 13, which is formed in this embodiment by the end face 25 of the pressure pin 52.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt.The invention is not limited to the described embodiments.

Claims (5)

Brennstoffeinspritzventil (1), insbesondere Injektor für Brennstoffeinspritzanlagen von luftverdichtenden, selbstzündenden Brennkraftmaschinen, mit einem Schaltventil (6), das in einem kopfseitigen Gehäuseteil (5)angeordnet ist, einem Düsenkörper (3), der über einen Haltekörper (4) mit dem kopfseitigen Gehäuseteil(5) verbunden ist, und einer in dem Düsenkörper (3) angeordneten Düsennadel (13), wobei der Haltekörper (4) eine Steuerraumbohrung (20) aufweist, wobei die Steuerraumbohrung (20) und eine Stirnfläche (25) der Düsennadel (13) einen Steuerraum (26) begrenzen und wobei in dem Steuerraum (26) ein Füllstück (30) angeordnet ist,
dadurch gekennzeichnet,
dass ein Steuerraumrohr (50) vorgesehen ist, das zumindest teilweise in der Steuerraumbohrung (20) angeordnet ist, dass das Steuerraumrohr (50) die Steuerraumbohrung (20) in einen das Steuerraumrohr (50) umgebenden Hochdruckteil (51) und einen innerhalb des Steuerraumrohrs (50) vorgesehenen Steuerraumteil aufteilt, der den Steuerraum (26) bildet, und dass das Füllstück (30) in dem Steuerraumteil der Steuerraumbohrung (20) angeordnet ist.Fuel injection valve (1), in particular injector for fuel injection systems of air-compressing, self-igniting internal combustion engines, with a switching valve (6) which is arranged in a head-side housing part (5), a nozzle body (3) via a holding body (4) with the head-side housing part (5) is connected, and one in the nozzle body (3) arranged nozzle needle (13), wherein the holding body (4) has a control chamber bore (20), wherein the control chamber bore (20) and an end face (25) of the nozzle needle (13) delimiting a control chamber (26) and wherein a filler piece (30) is arranged in the control chamber (26),
characterized,
in that a control chamber tube (50) is provided which is arranged at least partially in the control chamber bore (20), in that the control chamber tube (50) surrounds the control chamber bore (20) into a high-pressure part (51) surrounding the control chamber tube (50) and inside the control space tube ( 50), which divides the control chamber (26), and in that the filler (30) is arranged in the control chamber part of the control chamber bore (20). Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass das Füllstück (30) zumindest abschnittsweise stabförmig ausgestaltet ist und dass sich das Füllstück (30) zumindest abschnittsweise durch die Steuerraumbohrung (20) des Haltekörpers (4) erstreckt.Fuel injection valve according to claim 1, characterized in that the filler (30) is designed at least partially rod-shaped and that the filler (30) extends at least partially through the control chamber bore (20) of the holding body (4). Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Füllstück (30) in der Steuerraumbohrung (20) axial verschiebbar ist.Fuel injection valve according to claim 1 or 2, characterized in that the filler (30) in the control chamber bore (20) is axially displaceable. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Steuerraumrohr (50) von einer Düsenfeder (35) beaufschlagt ist, die sich einerseits an dem Steuerraumrohr (50) und andererseits an der Düsennadel (13) abstützt.Fuel injection valve according to one of claims 1 to 3, characterized in that the control chamber tube (50) by a nozzle spring (35) is acted upon, on the one hand to the control chamber tube (50) and on the other hand to the nozzle needle (13) is supported. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Düsennadel (12) in ihrem oberen Bereich mit einem Führungsdurchmesser ausgebildet ist und dass sie an diesem oberen Bereich in dem Steuerraumrohr (50) geführt ist.Fuel injection valve according to one of claims 1 to 3, characterized in that the nozzle needle (12) is formed in its upper region with a guide diameter and that it is guided at this upper region in the control chamber tube (50).
EP11190884.4A 2008-06-19 2009-04-22 Fuel injector valve Active EP2439398B1 (en)

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DE102010040316A1 (en) * 2010-09-07 2012-03-08 Robert Bosch Gmbh fuel injector
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DE19956522A1 (en) 1999-11-24 2001-06-07 Bosch Gmbh Robert High pressure fuel injector
US6499467B1 (en) * 2000-03-31 2002-12-31 Cummins Inc. Closed nozzle fuel injector with improved controllabilty
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EP2439398B1 (en) 2014-07-16

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