EP3067551B1 - Control valve for a fuel injector - Google Patents

Control valve for a fuel injector Download PDF

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Publication number
EP3067551B1
EP3067551B1 EP16150029.3A EP16150029A EP3067551B1 EP 3067551 B1 EP3067551 B1 EP 3067551B1 EP 16150029 A EP16150029 A EP 16150029A EP 3067551 B1 EP3067551 B1 EP 3067551B1
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EP
European Patent Office
Prior art keywords
pin
closing element
control valve
valve
valve closing
Prior art date
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Active
Application number
EP16150029.3A
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German (de)
French (fr)
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EP3067551A1 (en
Inventor
Lars Olems
Thomas Nierychlo
Mario Herrera
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3067551A1 publication Critical patent/EP3067551A1/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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0056—Throttling valves, e.g. having variable opening positions throttling the flow
    • 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
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, having the features of the preamble of claim 1.
  • Another example is from the DE 10 2006 057935 A1 known.
  • the protruding into the pressure chamber extension of the guide pin of such a control valve thus passes into the vicinity of a flow channel in which an outlet throttle is formed. If the outlet throttle is operated cavitating, vapor bubbles can form, which are transported by the fuel into the pressure chamber and there due to implode the increased static pressure. If the implosion occurs near the extension of the guide pin, this can lead to a material removal, the so-called cavitation erosion, on the surface of the extension.
  • the increased risk of cavitation damage in the hem area can be explained by the fact that the larger axial extent of the pressure chamber changes the behavior of the pressure waves that occur downstream of the outlet throttle. As the frequency decreases, the amplitude of the pressure wave increases significantly. The effect is reinforced by the narrowing of the cross-section in the hem area, so that this area is particularly critical. Due to the high amplitude of the pressure wave, the static pressure (in the trough) can fall below the vapor pressure, so that local steam bubbles occur. With stabilization or increase in the static pressure implode these, so that it comes to the already mentioned cavitation damage.
  • the present invention has for its object to provide a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, indicate in which the above problems do not occur or only to a significantly reduced extent.
  • control valve with the features of claim 1 is proposed.
  • Advantageous developments of the invention can be found in the dependent claims.
  • a fuel injector is proposed with such a control valve.
  • the control valve proposed for a fuel injector in a fuel injection system includes a liftable valve closure member for releasing and closing a drain passage formed in a valve piece, the valve closure member cooperating with a valve seat defining the drain passage.
  • the control valve comprises a pin for guiding the valve closing element, wherein the pin is at least partially accommodated in a passage passing through the valve closing element forming a guide gap.
  • the pin has an outer contour, which cooperates with a flow channel delimiting the inner contour of the valve piece or with a bore defining the inner contour of the valve closing element forming a throttle located outside the guide gap forming.
  • the formation of the throttle point has the consequence that pressure waves that arise in the flow channel or in adjoining areas are damped. With damping of the pressure waves or pressure peaks, the risk of cavitation also decreases.
  • the realization of the throttle point can be done in different ways.
  • the pin is designed to form the outer contour one or more stages.
  • the stepped design can therefore be used as an alternative or in addition to form a submersible in the drain passage pin-shaped portion with reduced outer diameter.
  • the peg-shaped section which dips into the drainage channel reduces the volume of the drainage channel and thus the amount of spill, which proves to be advantageous in particular when the control valve is used in a fuel injector for controlling the lifting movement of a nozzle needle.
  • the pin-shaped portion or another portion of the stepped-executed pin can be used to cooperate with an inner contour of the valve piece or the valve closing element forming the throttle point.
  • the throttle-forming outer contour is formed on a peg-shaped section of the pin which dips into the drainage channel. Due to the reduced outer diameter of the peg-shaped portion relative to the guide diameter of the pin acts while the peg-shaped portion with a flow channel defining the inner contour of the valve member forming a throttle point together. The throttle point is therefore still within the drain channel to lie.
  • the throttle-forming outer contour is formed on a portion of the pin connecting the pin-shaped portion with a guide portion.
  • This section of the pin can also have a reduced outer diameter compared to the guide diameter.
  • the valve closure element has an inner contour delimiting the bore, which cooperates with the outer contour of the pin to form the throttle point.
  • the inner contour of the valve closing element has for this purpose a reduced inner diameter.
  • the pin has at least one peripheral recess for forming the outer contour.
  • the puncture leads to the exposure of an outer contour, which has at least opposite the puncture an enlarged outer diameter and thus can be used to form the throttle point.
  • the recess is arranged in the region of an extended guide section of the pin, so that the exposed outer contour has an outer diameter corresponding to the guide diameter.
  • valve closing element has at least one circumferential undercut.
  • the undercut can be used to form the inner contour, which cooperates with the outer contour of the pin forming the throttle point.
  • the undercut can be used to form an annular space between the pin and the valve closing element.
  • the Annular space preferably establishes the required distance between the throttle point and the guide gap.
  • the throttle point is arranged outside of a main flow path of the fuel, which leads from the flow channel via the valve seat in a discharge space. This ensures that the throttle point has no influence on the flow of a discharged via the flow channel Abêtmenge. This is especially the case when the throttle point comes to rest outside the drain channel, d. H. when the outer contour of the pin cooperates with an inner contour of the valve closing element forming the throttle point.
  • the discharge channel comprises an outlet throttle, which is followed by a diffuser and / or a channel section with an enlarged inner diameter, so that the flow cross section increases in the direction of the valve seat.
  • the flow through the drainage channel is optimized.
  • a particularly low-wear control valve can be realized, since this hardly inclines with a valve closing element according to the above-mentioned prior art to relative movements relative to the valve seat.
  • the flow channel limiting valve seat can be flat or conical shaped.
  • the control valve preferably comprises an electromagnet, by means of which an armature can be acted upon.
  • the armature may be connected to the valve closure element or form the valve closure element itself.
  • a separately executed valve closing element is dispensable, so that the number of components can be reduced. This simplifies the construction of the control valve and lowers the manufacturing costs. Furthermore, the control valve can be made more compact.
  • a fuel injector for a fuel injection system in particular for a common rail injection system, proposed with a control valve according to the invention for controlling the lifting movement of a liftable nozzle needle, on the lifting movement at least one injection opening releasable and closable is.
  • the advantages of a control valve according to the invention come particularly well, so that the use in a fuel injector is to be regarded as a preferred application.
  • FIG. 1a and 1b The schematic representations of Fig. 1a and 1b in each case an already known control valve can be seen, which is particularly suitable for use in a fuel injector.
  • the two control valves differ only in relation to the length of a discharge channel 3 in the region of a channel section 20, which has a significantly enlarged inner diameter in relation to a discharge throttle 18 formed in the discharge channel 3 and a diffuser 19 adjoining thereto.
  • the extension of the channel section 20 has the consequence that the axial distance between a pin 5, which is at least partially accommodated in a bore 7 of a liftable valve closing element 1, and the outlet throttle 18 of the drain channel 3 increases, so that the risk of cavitation damage in the region of in the drain channel 3 dipping peg-shaped portion 12 of the pin 5 is reduced.
  • the pin 5 is used in each case the leadership of the valve closing element 1, which for lifting and closing a the flow channel 3 limiting valve seat 4 in the lifting Control valve is added.
  • the valve seat 4 is formed as the drain passage 3 in a valve piece 2.
  • the outlet channel 3 connects a control chamber 22 with a relief chamber 17, which results in a pressure drop in the control chamber 22.
  • the opening stroke of a nozzle needle (not shown) of the fuel injector can be initiated via the pressure drop.
  • FIG. 1b the illustrated design, it is the cavitation risk upstream of a guide gap 6 between the valve closing element 1 and the pin 5 to reduce.
  • An enlarged view of the control valve of Fig. 1b in the region of the valve seat 4 is in the Fig. 2a shown.
  • an outer contour 8 of the pin 5 an inner contour 9 of the valve piece 2 and / or an inner contour 10 of the valve closing element 1 can be modified such that a throttle point 11 upstream of the guide gap 6 is formed .
  • Embodiments are in the Fig. 2b-f as well as in the Fig. 3 represented, which are described in more detail below.
  • the pin-shaped portion 12 of the pin 5 has a widening, so that the outer contour 8 of the pin-shaped portion 12 cooperates with the inner contour 9 of the valve piece 2 forming the throttle point 11.
  • the inner diameter of the flow channel 3 of the valve piece 2 are reduced.
  • the throttle point 11 also comes to lie in the region of the discharge channel 3 in this case.
  • the pin 5 can be extended, so that according to the embodiment of Fig. 2d an outer contour 8 of the pin 5 cooperates with an inner contour 10 of the valve closing element 1 forming the throttle point 11. Because of the extension of the pin 5, this pushes further into the drainage channel 3, so that a portion 23 having an outer diameter which is between that of the pin-shaped portion 12 and a guide portion 14, in the region of reduced inside diameter of the bore 7 of the valve closing element 1 comes to rest.
  • an area with an increased inner diameter adjoins the area with a reduced inner diameter, which area is created by an undercut 16 within the bore 7 of the valve closing element 1. This leads to the formation of an annular space 15 between the pin 5 and the valve closing element 1.
  • the undercut 16 further defines the guide gap 6, which adjoins the annulus 15.
  • Fig. 2d can, as in the Fig. 2e shown, and the undercut 16 are reduced within the bore 7 of the valve closing element 1.
  • the pin 5 does not need to be modified in this case. However, this also reduces the annular space 15 or the axial distance between the throttle point 11 and the guide gap 6.
  • the pin 5 has an extended guide portion 14, so that this protrudes into the annular space 15.
  • a circumferential annular collar can be exempted, which has an outer contour 8, which cooperates with an inner contour 10 of the valve closing element 1 forming the throttle point 11.
  • the inner contour 10 may even be in the region of the undercut 16 in this case.
  • valve closing element 1 can be formed by a liftable anchor, which is designed here as a flat armature.
  • an electromagnet 21 is provided, which is part of the control valve.

Description

Die Erfindung betrifft ein Steuerventil für einen Kraftstoffinjektor in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, having the features of the preamble of claim 1.

Stand der TechnikState of the art

Aus der Offenlegungsschrift DE 10 2007 044 357 A1 geht ein Steuerventil für einen Kraftstoffinjektor hervor, das eine einen Druckraum begrenzende Steuerhülse aufweist, die in ihrer Längsrichtung beweglich gelagert ist. Die Steuerhülse wirkt hierbei mit einem Ventilsitz zusammen, der an einem Ventilkörper ausgebildet ist. Der Ventilkörper bildet zugleich eine mit dem Druckraum in hydraulischer Verbindung stehende Ausnehmung aus, die derart ausgebildet ist, dass bei schwankendem Druck im Druckraum, einerseits die Steuerhülse und andererseits die Ausnehmung im Ventilkörper radial aufgeweitet werden. Durch diese Maßnahme sollen Relativbewegungen der Steuerhülse gegenüber dem Ventilsitz gering gehalten werden, was wiederum einen verminderten Verschleiß zur Folge hat. Der Druckraum führt jedoch zu einer Vergrößerung der abzuführenden Absteuermenge. Um das Volumen des Druckraums zu reduzieren, wird vorgeschlagen, dass ein in der Steuerhülse aufgenommener Führungsstift einen in den Druckraum hineinragenden Fortsatz besitzt. Der Fortsatz weist im Verhältnis zum Innendurchmesser der Steuerhülse einen verringerten Durchmesser auf.From the publication DE 10 2007 044 357 A1 goes out a control valve for a fuel injector having a pressure chamber limiting control sleeve which is movably mounted in its longitudinal direction. The control sleeve acts in this case with a valve seat which is formed on a valve body. The valve body also forms a standing with the pressure chamber in hydraulic communication recess, which is designed such that at fluctuating pressure in the pressure chamber, on the one hand the control sleeve and on the other hand, the recess in the valve body are radially expanded. By this measure, relative movements of the control sleeve relative to the valve seat to be kept low, which in turn has a reduced wear result. However, the pressure chamber leads to an increase in the amount of tax deducted. In order to reduce the volume of the pressure chamber, it is proposed that a guide pin accommodated in the control sleeve has an extension projecting into the pressure chamber. The extension has a reduced diameter in relation to the inner diameter of the control sleeve.

Ein anderes Beispiel ist aus dem DE 10 2006 057935 A1 bekannt.Another example is from the DE 10 2006 057935 A1 known.

Der in den Druckraum hineinragende Fortsatz des Führungsstifts eines derartige Steuerventils gelangt damit in die Nähe eines Ablaufkanals, in dem eine Ablaufdrossel ausgebildet ist. Wird die Ablaufdrossel kavitierend betrieben, können Dampfblasen entstehen, die von dem Kraftstoff in den Druckraum transportiert werden und dort aufgrund des erhöhten statischen Drucks implodieren. Erfolgt die Implosion nahe dem Fortsatz des Führungsstifts, kann dies zu einer Materialabtragung, der sogenannten Kavitationserosion, an der Oberfläche des Fortsatzes führen.The protruding into the pressure chamber extension of the guide pin of such a control valve thus passes into the vicinity of a flow channel in which an outlet throttle is formed. If the outlet throttle is operated cavitating, vapor bubbles can form, which are transported by the fuel into the pressure chamber and there due to implode the increased static pressure. If the implosion occurs near the extension of the guide pin, this can lead to a material removal, the so-called cavitation erosion, on the surface of the extension.

Um dies zu vermeiden, kann die axiale Ausdehnung des Druckraums und damit der Abstand des Fortsatzes zur Ablaufdrossel vergrößert werden (siehe beigefügte Fig. 1a und 1b). Allerdings hat sich zugleich gezeigt, dass mit Vergrößerung der axialen Ausdehnung des Druckraums die Gefahr eines Kavitationsschadens im Saumbereich des Führungsstifts steigt. Als "Saumbereich" wird ein umlaufender Absatz außen am Führungsstift bezeichnet, der zwischen dem Durchmesser des Fortsatzes und dem Führungsdurchmesser vermittelt.To avoid this, the axial extent of the pressure chamber and thus the distance of the extension to the outlet throttle can be increased (see attached Fig. 1a and 1b ). However, it has also been shown that with increasing the axial extent of the pressure chamber, the risk of cavitation damage in the hem area of the guide pin increases. As a "hem area" a circumferential paragraph outside the guide pin is called, which mediates between the diameter of the extension and the guide diameter.

Die erhöhte Gefahr eines Kavitationsschadens im Saumbereich lässt sich damit erklären, dass durch die größere axiale Ausdehnung des Druckraums das Verhalten der Druckwellen verändert wird, die stromabwärts der Ablaufdrossel entstehen. Während sich die Frequenz verringert, nimmt die Amplitude der Druckwelle deutlich zu. Der Effekt wird durch die Querschnittsverengung im Saumbereich nochmals verstärkt, so dass dieser Bereich besonders kritisch ist. Durch die hohe Amplitude der Druckwelle kann der statische Druck (im Wellental) unter den Dampfdruck fallen, so dass lokal Dampfblasen entstehen. Mit Stabilisierung bzw. Anstieg des statischen Drucks implodieren diese, so dass es zu den bereits erwähnten Kavitationsschäden kommt.The increased risk of cavitation damage in the hem area can be explained by the fact that the larger axial extent of the pressure chamber changes the behavior of the pressure waves that occur downstream of the outlet throttle. As the frequency decreases, the amplitude of the pressure wave increases significantly. The effect is reinforced by the narrowing of the cross-section in the hem area, so that this area is particularly critical. Due to the high amplitude of the pressure wave, the static pressure (in the trough) can fall below the vapor pressure, so that local steam bubbles occur. With stabilization or increase in the static pressure implode these, so that it comes to the already mentioned cavitation damage.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Steuerventil für einen Kraftstoffinjektor in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, anzugeben, bei dem die vorstehend genannten Probleme nicht oder nur in deutlich gemindertem Maße auftreten.The present invention has for its object to provide a control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, indicate in which the above problems do not occur or only to a significantly reduced extent.

Zur Lösung der Aufgabe wird das Steuerventil mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Ferner wird ein Kraftstoffinjektor mit einem solche Steuerventil vorgeschlagen.To solve the problem, the control valve with the features of claim 1 is proposed. Advantageous developments of the invention can be found in the dependent claims. Furthermore, a fuel injector is proposed with such a control valve.

Offenbarung der ErfindungDisclosure of the invention

Das für einen Kraftstoffinjektor in einem Kraftstoffeinspritzsystem, insbesondere in einem Common-Rail-Einspritzsystem, vorgeschlagene Steuerventil umfasst ein hubbewegliches Ventilschließelement zum Freigeben und Verschließen eines in einem Ventilstück ausgebildeten Ablaufkanals, wobei das Ventilschließelement mit einem den Ablaufkanal begrenzenden Ventilsitz zusammenwirkt. Ferner umfasst das Steuerventil einen Stift zur Führung des Ventilschließelements, wobei der Stift unter Ausbildung eines Führungsspalts zumindest abschnittsweise in einer das Ventilschließelement durchsetzenden Bohrung aufgenommen ist. Erfindungsgemäß besitzt der Stift eine Außenkontur, die mit einer den Ablaufkanal begrenzenden Innenkontur des Ventilstücks oder mit einer die Bohrung begrenzenden Innenkontur des Ventilschließelements eine außerhalb des Führungsspalts liegende Drosselstelle ausbildend zusammenwirkt.The control valve proposed for a fuel injector in a fuel injection system, particularly in a common rail injection system, includes a liftable valve closure member for releasing and closing a drain passage formed in a valve piece, the valve closure member cooperating with a valve seat defining the drain passage. Further, the control valve comprises a pin for guiding the valve closing element, wherein the pin is at least partially accommodated in a passage passing through the valve closing element forming a guide gap. According to the invention, the pin has an outer contour, which cooperates with a flow channel delimiting the inner contour of the valve piece or with a bore defining the inner contour of the valve closing element forming a throttle located outside the guide gap forming.

Die Ausbildung der Drosselstelle hat zur Folge, dass Druckwellen, die im Ablaufkanal oder in sich hieran anschließenden Bereichen entstehen, gedämpft werden. Mit Dämpfung der Druckwellen bzw. der Druckspitzen nimmt auch das Kavitationsrisiko ab. Dadurch, dass die Drosselstelle außerhalb des Führungsspalts ausgebildet wird, kommt der Saumbereich hinter, d. h. stromabwärts, der Drosselstelle zu liegen. Auf diese Weise wird der Saumbereich effektiv geschützt. Denn um den Saumbereich zu erreichen, muss die Druckwelle den engen Drosselquerschnitt passieren, wobei die Druckwelle Energie verliert.The formation of the throttle point has the consequence that pressure waves that arise in the flow channel or in adjoining areas are damped. With damping of the pressure waves or pressure peaks, the risk of cavitation also decreases. The fact that the throttle point is formed outside the guide gap, the hem area comes behind, d. H. downstream, to lie the throttle point. This effectively protects the hem area. Because in order to reach the hem area, the pressure wave has to pass the narrow throttle area, whereby the pressure wave loses energy.

Die Realisierung der Drosselstelle kann auf unterschiedliche Art und Weise erfolgen.The realization of the throttle point can be done in different ways.

Bevorzugt ist der Stift zur Ausbildung der Außenkontur einfach oder mehrfach gestuft ausgeführt. Das heißt, dass der Stift bevorzugt unterschiedliche Außendurchmesser besitzt. Die gestufte Ausführung kann daher alternativ oder ergänzend dazu genutzt werden, einen in den Ablaufkanal eintauchenden zapfenförmigen Abschnitts mit verringertem Außendurchmesser auszubilden. Der in den Ablaufkanal eintauchende zapfenförmige Abschnitt verringert das Volumen des Ablaufkanals und damit die Absteuermenge, was sich insbesondere bei Einsatz des Steuerventils in einem Kraftstoffinjektor zur Steuerung der Hubbewegung einer Düsennadel als Vorteil erweist. Ferner kann der zapfenförmige Abschnitt oder ein anderer Abschnitt des gestuft ausgeführten Stifts dazu genutzt werden, mit einer Innenkontur des Ventilstücks oder des Ventilschließelements die Drosselstelle ausbildend zusammenzuwirken.Preferably, the pin is designed to form the outer contour one or more stages. This means that the pin preferably has different outer diameters. The stepped design can therefore be used as an alternative or in addition to form a submersible in the drain passage pin-shaped portion with reduced outer diameter. The peg-shaped section which dips into the drainage channel reduces the volume of the drainage channel and thus the amount of spill, which proves to be advantageous in particular when the control valve is used in a fuel injector for controlling the lifting movement of a nozzle needle. Furthermore, the pin-shaped portion or another portion of the stepped-executed pin can be used to cooperate with an inner contour of the valve piece or the valve closing element forming the throttle point.

Erfindungsgemäß ist die drosselbildende Außenkontur an einem in den Ablaufkanal eintauchenden zapfenförmigen Abschnitt des Stifts ausgebildet. Aufgrund des verringerten Außendurchmessers des zapfenförmigen Abschnitts gegenüber dem Führungsdurchmesser des Stifts wirkt dabei der zapfenförmige Abschnitt mit einer den Ablaufkanal begrenzenden Innenkontur des Ventilstücks eine Drosselstelle ausbildend zusammen. Die Drosselstelle kommt demnach noch innerhalb des Ablaufkanals zu liegen.According to the invention, the throttle-forming outer contour is formed on a peg-shaped section of the pin which dips into the drainage channel. Due to the reduced outer diameter of the peg-shaped portion relative to the guide diameter of the pin acts while the peg-shaped portion with a flow channel defining the inner contour of the valve member forming a throttle point together. The throttle point is therefore still within the drain channel to lie.

Gemäß einer alternativen Ausführungsform der Erfindung ist die drosselbildende Au-ßenkontur an einem Abschnitt des Stifts ausgebildet, der den zapfenförmigen Abschnitt mit einem Führungsabschnitt verbindet. Auch dieser Abschnitt des Stifts kann einen gegenüber dem Führungsdurchmesser reduzierten Außendurchmesser besitzen. Ist dies der Fall, weist vorzugsweise das Ventilschließelement eine die Bohrung begrenzende Innenkontur auf, die mit der Außenkontur des Stifts die Drosselstelle ausbildend zusammenwirkt. Die Innenkontur des Ventilschließelements weist hierzu einen verringerten Innendurchmesser auf.According to an alternative embodiment of the invention, the throttle-forming outer contour is formed on a portion of the pin connecting the pin-shaped portion with a guide portion. This section of the pin can also have a reduced outer diameter compared to the guide diameter. If this is the case, preferably the valve closure element has an inner contour delimiting the bore, which cooperates with the outer contour of the pin to form the throttle point. The inner contour of the valve closing element has for this purpose a reduced inner diameter.

Alternativ oder ergänzend zu einer gestuften Ausführung des Stifts wird vorgeschlagen, dass der Stift zur Ausbildung der Außenkontur mindestens einen umlaufenden Einstich besitzt. Der Einstich führt zur Freilegung einer Außenkontur, die zumindest gegenüber dem Einstich einen vergrößerten Außendurchmesser besitzt und somit zur Ausbildung der Drosselstelle genutzt werden kann. Vorzugsweise ist der Einstich im Bereich eines verlängerten Führungsabschnitts des Stifts angeordnet, so dass die freigelegte Außenkontur einen dem Führungsdurchmesser entsprechenden Außendurchmesser besitzt.As an alternative or in addition to a stepped embodiment of the pin, it is proposed that the pin has at least one peripheral recess for forming the outer contour. The puncture leads to the exposure of an outer contour, which has at least opposite the puncture an enlarged outer diameter and thus can be used to form the throttle point. Preferably, the recess is arranged in the region of an extended guide section of the pin, so that the exposed outer contour has an outer diameter corresponding to the guide diameter.

Des Weiteren wird vorgeschlagen, dass das Ventilschließelement mindestens einen umlaufenden Hinterstich besitzt. Der Hinterstich kann zur Ausbildung der Innenkontur genutzt werden, die mit der Außenkontur des Stifts die Drosselstelle ausbildend zusammenwirkt. Alternativ oder ergänzend kann der Hinterstich zur Ausbildung eines Ringraums zwischen dem Stift und dem Ventilschließelement genutzt werden. Der Ringraum stellt vorzugsweise den erforderlichen Abstand zwischen der Drosselstelle und dem Führungsspalt her.Furthermore, it is proposed that the valve closing element has at least one circumferential undercut. The undercut can be used to form the inner contour, which cooperates with the outer contour of the pin forming the throttle point. Alternatively or additionally, the undercut can be used to form an annular space between the pin and the valve closing element. The Annular space preferably establishes the required distance between the throttle point and the guide gap.

Vorteilhafterweise ist die Drosselstelle außerhalb eines Hauptströmungspfads des Kraftstoffstoffs angeordnet, der vom Ablaufkanal über den Ventilsitz in einen Entlastungsraum führt. Dadurch ist sichergestellt, dass die Drosselstelle keinen Einfluss auf die Strömung einer über den Ablaufkanal abgeführten Absteuermenge hat. Dies ist insbesondere der Fall, wenn die Drosselstelle außerhalb des Ablaufkanals zu liegen kommt, d. h. wenn die Außenkontur des Stifts mit einer Innenkontur des Ventilschließelements die Drosselstelle ausbildend zusammenwirkt.Advantageously, the throttle point is arranged outside of a main flow path of the fuel, which leads from the flow channel via the valve seat in a discharge space. This ensures that the throttle point has no influence on the flow of a discharged via the flow channel Absteuermenge. This is especially the case when the throttle point comes to rest outside the drain channel, d. H. when the outer contour of the pin cooperates with an inner contour of the valve closing element forming the throttle point.

In Weiterbildung der Erfindung wird vorgeschlagen, dass der Ablaufkanal eine Ablaufdrossel umfasst, der ein Diffusor und/oder ein Kanalabschnitt mit vergrößertem Innendurchmesser nachgeschaltet ist, so dass der Strömungsquerschnitt in Richtung des Ventilsitzes zunimmt. Auf diese Weise wird die Strömung durch den Ablaufkanal optimiert. Ferner kann ein besonders verschleißarmes Steuerventil realisiert werden, da das mit einem Ventilschließelement gemäß dem eingangs genannten Stand der Technik kaum zu Relativbewegungen gegenüber dem Ventilsitz neigt.In a development of the invention, it is proposed that the discharge channel comprises an outlet throttle, which is followed by a diffuser and / or a channel section with an enlarged inner diameter, so that the flow cross section increases in the direction of the valve seat. In this way, the flow through the drainage channel is optimized. Furthermore, a particularly low-wear control valve can be realized, since this hardly inclines with a valve closing element according to the above-mentioned prior art to relative movements relative to the valve seat.

Der den Ablaufkanal begrenzende Ventilsitz kann dabei flach oder konisch geformt sein.The flow channel limiting valve seat can be flat or conical shaped.

Zur Steuerung der Hubbewegung des Ventilschließelements umfasst das Steuerventil bevorzugt einen Elektromagneten, mittels dessen auf einen Anker einwirkbar ist. Der Anker kann mit dem Ventilschließelement verbunden sein oder das Ventilschließelement selbst ausbilden. Im letztgenannten Fall ist ein separat ausgeführtes Ventilschließelement entbehrlich, so dass die Anzahl der Bauteile reduziert werden kann. Dies vereinfacht den Aufbau des Steuerventils und senkt die Herstellungskosten. Ferner kann das Steuerventil kompaktbauender gestaltet werden.To control the lifting movement of the valve closing element, the control valve preferably comprises an electromagnet, by means of which an armature can be acted upon. The armature may be connected to the valve closure element or form the valve closure element itself. In the latter case, a separately executed valve closing element is dispensable, so that the number of components can be reduced. This simplifies the construction of the control valve and lowers the manufacturing costs. Furthermore, the control valve can be made more compact.

Schließlich wird ein Kraftstoffinjektor für ein Kraftstoffeinspritzsystem, insbesondere für ein Common-Rail-Einspritzsystem, mit einem erfindungsgemäßen Steuerventil zur Steuerung der Hubbewegung einer hubbeweglichen Düsennadel vorgeschlagen, über deren Hubbewegung mindestens eine Einspritzöffnung freigebbar und verschließbar ist. Hier kommen die Vorteile eines erfindungsgemäßen Steuerventils besonders gut zum Tragen, so dass der Einsatz in einem Kraftstoffinjektor als bevorzugte Anwendung anzusehen ist.Finally, a fuel injector for a fuel injection system, in particular for a common rail injection system, proposed with a control valve according to the invention for controlling the lifting movement of a liftable nozzle needle, on the lifting movement at least one injection opening releasable and closable is. Here, the advantages of a control valve according to the invention come particularly well, so that the use in a fuel injector is to be regarded as a preferred application.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

Fig. 1a-b
jeweils einen schematischen Längsschnitt durch ein bekanntes Steuerventil,
Fig. 2a
einen schematischen Längsschnitt durch ein bekanntes Steuerventil im Bereich seines Ventilsitzes,
Fig. 2b-f
jeweils einen schematischen Längsschnitt durch ein erfindungsgemäßes Steuerventil gemäß einer bevorzugter Ausführungsform und
Fig. 3
einen schematischen Längsschnitt durch ein weiteres erfindungsgemäßes Steuerventil gemäß einer bevorzugter Ausführungsform.
Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
Fig. 1a-b
each a schematic longitudinal section through a known control valve,
Fig. 2a
a schematic longitudinal section through a known control valve in the region of its valve seat,
Fig. 2b-f
in each case a schematic longitudinal section through an inventive control valve according to a preferred embodiment and
Fig. 3
a schematic longitudinal section through another inventive control valve according to a preferred embodiment.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Den schematische Darstellungen der Fig. 1a und 1b ist jeweils ein bereits bekanntes Steuerventil zu entnehmen, das insbesondere für den Einsatz in einem Kraftstoffinjektor geeignet ist. Die beiden Steuerventile unterscheiden sich lediglich in Bezug auf die Länge eines Ablaufkanals 3 im Bereich eines Kanalabschnitts 20, der gegenüber einer im Ablaufkanal 3 ausgebildeten Ablaufdrossel 18 und einem sich hieran anschließenden Diffusor 19 einen deutlich vergrößerten Innendurchmesser besitzt. Die Verlängerung des Kanalabschnitts 20 hat zur Folge, dass der axiale Abstand zwischen einem Stift 5, der zumindest abschnittsweise in einer Bohrung 7 eines hubbeweglichen Ventilschließelements 1 aufgenommen ist, und der Ablaufdrossel 18 des Ablaufkanals 3 steigt, so dass die Gefahr eines Kavitationsschadens im Bereich eines in den Ablaufkanal 3 eintauchenden zapfenförmigen Abschnitts 12 des Stifts 5 gemindert ist.The schematic representations of Fig. 1a and 1b in each case an already known control valve can be seen, which is particularly suitable for use in a fuel injector. The two control valves differ only in relation to the length of a discharge channel 3 in the region of a channel section 20, which has a significantly enlarged inner diameter in relation to a discharge throttle 18 formed in the discharge channel 3 and a diffuser 19 adjoining thereto. The extension of the channel section 20 has the consequence that the axial distance between a pin 5, which is at least partially accommodated in a bore 7 of a liftable valve closing element 1, and the outlet throttle 18 of the drain channel 3 increases, so that the risk of cavitation damage in the region of in the drain channel 3 dipping peg-shaped portion 12 of the pin 5 is reduced.

Der Stift 5 dient jeweils der Führung des Ventilschließelements 1, das zum Öffnen und Schließen eines den Ablaufkanal 3 begrenzenden Ventilsitzes 4 hubbeweglich in dem Steuerventil aufgenommen ist. Der Ventilsitz 4 ist wie der Ablaufkanal 3 in einem Ventilstück 2 ausgebildet. Bei geöffnetem Ventilsitz 4 verbindet der Ablaufkanal 3 einen Steuerraum 22 mit einem Entlastungsraum 17, was einen Druckabfall im Steuerraum 22 zur Folge hat. Über den Druckabfall kann wiederum der Öffnungshub einer Düsennadel (nicht dargestellt) des Kraftstoffinjektors initiiert werden.The pin 5 is used in each case the leadership of the valve closing element 1, which for lifting and closing a the flow channel 3 limiting valve seat 4 in the lifting Control valve is added. The valve seat 4 is formed as the drain passage 3 in a valve piece 2. When the valve seat 4 is open, the outlet channel 3 connects a control chamber 22 with a relief chamber 17, which results in a pressure drop in the control chamber 22. In turn, the opening stroke of a nozzle needle (not shown) of the fuel injector can be initiated via the pressure drop.

Ausgehend von der in der Fig. 1b dargestellten Bauform gilt es das Kavitationsrisiko stromaufwärts eines Führungsspalts 6 zwischen dem Ventilschließelement 1 und dem Stift 5 zu mindern. Eine vergrößerte Darstellung des Steuerventils der Fig. 1b im Bereich des Ventilsitzes 4 ist in der Fig. 2a dargestellt.Starting from the in the Fig. 1b the illustrated design, it is the cavitation risk upstream of a guide gap 6 between the valve closing element 1 and the pin 5 to reduce. An enlarged view of the control valve of Fig. 1b in the region of the valve seat 4 is in the Fig. 2a shown.

Um das Kavitationsrisiko in einem dem Führungsspalt 6 vorgelagerten Bereich zu mindern, kann eine Außenkontur 8 des Stifts 5, eine Innenkontur 9 des Ventilstücks 2 und/oder eine Innenkontur 10 des Ventilschließelements 1 derart modifiziert werden, dass eine dem Führungsspalt 6 vorgelagerte Drosselstelle 11 ausgebildet wird. Ausführungsbeispiele sind in den Fig. 2b-f sowie in der Fig. 3 dargestellt, die nachfolgend näher beschrieben werden.In order to reduce the risk of cavitation in a region upstream of the guide gap 6, an outer contour 8 of the pin 5, an inner contour 9 of the valve piece 2 and / or an inner contour 10 of the valve closing element 1 can be modified such that a throttle point 11 upstream of the guide gap 6 is formed , Embodiments are in the Fig. 2b-f as well as in the Fig. 3 represented, which are described in more detail below.

Bei dem Ausführungsbeispiel der Fig. 2b weist der zapfenförmige Abschnitt 12 des Stifts 5 eine Aufweitung auf, so dass die Außenkontur 8 des zapfenförmigen Abschnitts 12 mit der Innenkontur 9 des Ventilstücks 2 die Drosselstelle 11 ausbildend zusammenwirkt.In the embodiment of the Fig. 2b the pin-shaped portion 12 of the pin 5 has a widening, so that the outer contour 8 of the pin-shaped portion 12 cooperates with the inner contour 9 of the valve piece 2 forming the throttle point 11.

Alternativ hierzu kann, wie in der Fig. 2c dargestellt, der Innendurchmesser des Ablaufkanals 3 des Ventilstücks 2 verkleinert werden. Die Drosselstelle 11 kommt auch in diesem Fall im Bereich des Ablaufkanals 3 zu liegen.Alternatively, as in the Fig. 2c shown, the inner diameter of the flow channel 3 of the valve piece 2 are reduced. The throttle point 11 also comes to lie in the region of the discharge channel 3 in this case.

Um die Drosselstelle 11 zu verlagern, so dass sie außerhalb des Ablaufkanals 3 zu liegen kommt, kann der Stift 5 verlängert werden, so dass gemäß dem Ausführungsbeispiel der Fig. 2d eine Außenkontur 8 des Stifts 5 mit einer Innenkontur 10 des Ventilschließelements 1 die Drosselstelle 11 ausbildend zusammenwirkt. Denn durch die Verlängerung des Stifts 5 schiebt sich dieser weiter in den Ablaufkanal 3 hinein, so dass ein Abschnitt 23 mit einem Außendurchmesser, der zwischen dem des zapfenförmigen Abschnitts 12 und dem eines Führungsabschnitts 14 liegt, im Bereich eines verringerten Innendurchmessers der Bohrung 7 des Ventilschließelements 1 zu liegen kommt. Um eine definierte Drosselstelle 11 auszubilden, schließt sich an den Bereich mit verringertem Innendurchmesser ein Bereich mit vergrößertem Innendurchmesser an, der durch einen Hinterstich 16 innerhalb der Bohrung 7 des Ventilschließelements 1 geschaffen wird. Dies führt zur Ausbildung eines Ringraums 15 zwischen dem Stift 5 und dem Ventilschließelement 1. Der Hinterstich 16 definiert ferner den Führungsspalt 6, der sich an den Ringraum 15 anschließt.In order to displace the throttle point 11 so that it comes to rest outside of the drainage channel 3, the pin 5 can be extended, so that according to the embodiment of Fig. 2d an outer contour 8 of the pin 5 cooperates with an inner contour 10 of the valve closing element 1 forming the throttle point 11. Because of the extension of the pin 5, this pushes further into the drainage channel 3, so that a portion 23 having an outer diameter which is between that of the pin-shaped portion 12 and a guide portion 14, in the region of reduced inside diameter of the bore 7 of the valve closing element 1 comes to rest. In order to form a defined throttle point 11, an area with an increased inner diameter adjoins the area with a reduced inner diameter, which area is created by an undercut 16 within the bore 7 of the valve closing element 1. This leads to the formation of an annular space 15 between the pin 5 and the valve closing element 1. The undercut 16 further defines the guide gap 6, which adjoins the annulus 15.

Alternativ zum Ausführungsbeispiel der Fig. 2d kann, wie in der Fig. 2e dargestellt, auch der Hinterstich 16 innerhalb der Bohrung 7 des Ventilschließelements 1 verkleinert werden. Der Stift 5 muss in diesem Fall nicht modifiziert werden. Allerdings verkleinert sich damit auch der Ringraum 15 bzw. der axiale Abstand der Drosselstelle 11 zum Führungsspalt 6.Alternative to the embodiment of Fig. 2d can, as in the Fig. 2e shown, and the undercut 16 are reduced within the bore 7 of the valve closing element 1. The pin 5 does not need to be modified in this case. However, this also reduces the annular space 15 or the axial distance between the throttle point 11 and the guide gap 6.

Soll der axiale Abstand beibehalten werden, kann, entsprechend dem Ausführungsbeispiel der Fig. 2f, der mittlere Abschnitt 23 des Stifts 5 zu Lasten des zapfenförmigen Abschnitts 12 verlängert werden.If the axial distance to be maintained, can, according to the embodiment of the Fig. 2f , the central portion 23 of the pin 5 are extended at the expense of the pin-shaped portion 12.

Eine weitere Alternative zur Ausbildung der Drosselstelle 11 ist der Fig. 3 zu entnehmen. Hier weist der Stift 5 einen verlängerten Führungsabschnitt 14 auf, so dass dieser in den Ringraum 15 hineinragt. Mittels eines Einstichs 13 kann ein umlaufender Ringbund freigestellt werden, der eine Außenkontur 8 besitzt, die mit einer Innenkontur 10 des Ventilschließelements 1 die Drosselstelle 11 ausbildend zusammenwirkt. Die Innenkontur 10 kann in diesem Fall sogar im Bereich des Hinterstichs 16 liegen.Another alternative to the formation of the throttle point 11 is the Fig. 3 refer to. Here, the pin 5 has an extended guide portion 14, so that this protrudes into the annular space 15. By means of a groove 13, a circumferential annular collar can be exempted, which has an outer contour 8, which cooperates with an inner contour 10 of the valve closing element 1 forming the throttle point 11. The inner contour 10 may even be in the region of the undercut 16 in this case.

Wie der Fig. 3 ferner zu entnehmen ist, kann das Ventilschließelement 1 durch einen hubbeweglichen Anker ausgebildet werden, der vorliegend als Flachanker ausgeführt ist. Zur Einwirkung auf den Anker ist ein Elektromagnet 21 vorgesehen, der Bestandteil des Steuerventils ist.Again Fig. 3 can also be seen, the valve closing element 1 can be formed by a liftable anchor, which is designed here as a flat armature. To act on the armature, an electromagnet 21 is provided, which is part of the control valve.

Claims (9)

  1. Control valve for a fuel injector in a fuel injection system, in particular in a common rail injection system, comprising a valve closing element (1) which is capable of stroke movement for releasing and closing an outflow duct (3) that is configured in a valve piece (2), wherein the valve closing element (1) interacts with a valve seat (4) that delimits the outflow duct (3), furthermore comprising a pin (5) for guiding the valve closing element (1), wherein the pin (5) while configuring a guiding gap (6) is received in a bore (7) that at least in portions penetrates the valve closing element (1),
    characterized in that
    the pin (5) has a cone-shaped portion (12) which has an external diameter which is reduced in relation to the guiding diameter of the pin (5) and by way of which the pin (5) plunges into the outflow duct (3), wherein the pin (5) has an external contour (8) which interacts with an internal contour (9) of the valve piece (2) that delimits the outflow duct (3), or with an internal contour (10) of the valve closing element (1) that delimits the bore (7), so as to configure a throttle point (11) that lies outside the guiding gap (6).
  2. Control valve according to Claim 1,
    characterized in that the pin (5), for configuring the external contour (8), is embodied so as to have multiple steps.
  3. Control valve according to Claim 1,
    characterized in that the pin (5), for configuring the external contour (8), possesses at least one encircling recess (13) which is preferably disposed in the region of an elongated guiding portion (14) of the pin (5).
  4. Control valve according to one of the preceding claims,
    characterized in that the valve closing element (1), for configuring the internal contour (10) and/or an annular chamber (15) between the pin (5) and the valve closing element (1), possesses at least one encircling undercut (16).
  5. Control valve according to one of the preceding claims,
    characterized in that the throttle point (11) is disposed outside a primary flow path of the fuel, said primary flow path leading from the outflow duct (3) by way of the valve seat (4) into a relief chamber (17).
  6. Control valve according to one of the preceding claims,
    characterized in that the outflow duct (3) comprises an outflow throttle (18), a diffusor (19) and/or a duct portion (20) having an enlarged internal diameter being disposed downstream of said outflow throttle (18) such that the flow cross section increases in the direction of the valve seat (4).
  7. Control valve according to one of the preceding claims,
    characterized in that the valve seat (4) that delimits the outflow duct (3) is shaped so as to be flat or conical.
  8. Control valve according to one of the preceding claims,
    characterized in that the control valve for controlling the stroke movement of the valve closing element (1) comprises an electromagnet (21) by means of which an armature is actuatable, said armature being connected to the valve closing element (1) or configuring the valve closing element (1).
  9. Fuel injector for a fuel injection system, in particular a common rail injection system, having a control valve according to one of the preceding claims for controlling the stroke movement of a nozzle needle which is capable of stroke movements, at least one injection opening being capable of being released or closed by way of the stroke movement of said nozzle needle.
EP16150029.3A 2015-03-12 2016-01-04 Control valve for a fuel injector Active EP3067551B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015204515.3A DE102015204515A1 (en) 2015-03-12 2015-03-12 Control valve for a fuel injector

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EP3067551A1 EP3067551A1 (en) 2016-09-14
EP3067551B1 true EP3067551B1 (en) 2019-09-11

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DE (1) DE102015204515A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006057935A1 (en) * 2006-12-08 2008-06-12 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
DE102007044357A1 (en) 2007-06-21 2008-12-24 Robert Bosch Gmbh Control valve for a fuel injection valve
DE102013211855A1 (en) * 2013-06-21 2014-12-24 Robert Bosch Gmbh Control valve for a fuel injector
DE102014220345A1 (en) * 2014-10-08 2016-04-14 Robert Bosch Gmbh Fuel injection valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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