EP3034856B1 - Fuel injector valve - Google Patents

Fuel injector valve Download PDF

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Publication number
EP3034856B1
EP3034856B1 EP15191378.7A EP15191378A EP3034856B1 EP 3034856 B1 EP3034856 B1 EP 3034856B1 EP 15191378 A EP15191378 A EP 15191378A EP 3034856 B1 EP3034856 B1 EP 3034856B1
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EP
European Patent Office
Prior art keywords
sleeve
fuel injection
injection valve
valve according
fuel
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.)
Active
Application number
EP15191378.7A
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German (de)
French (fr)
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EP3034856A1 (en
Inventor
Buenyamin Duru
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3034856A1 publication Critical patent/EP3034856A1/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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injector in which a fuel filter is press-fitted into the fuel inlet port at the upstream end of the fuel injector.
  • This fuel filter is provided at the periphery, for example, with a brass ring which forms the mating with the wall of the Brennscherinlassstutzens when pressing the fuel filter.
  • the brass ring surrounds an annular solid plastic section of the main body of the fuel filter, from which extend, for example, three webs in the longitudinal direction to a common bottom portion, of which the actual screen mesh is encapsulated in these sub-areas.
  • An adjusting sleeve downstream of the fuel filter is used to adjust the spring bias of a voltage applied to the adjusting return spring.
  • the valve has an actuator, by the excitation of a lifting movement of a valve needle is achieved, whereby actuation of a valve closing body, which forms a sealing seat together with a valve seat surface, is made possible.
  • the valve has an inlet-side fuel supply, wherein in the fuel inlet, an adjusting element for adjusting the spring force of a return spring is arranged and wherein the adjusting element is bounded by a sleeve to the outside and in the wall and in the bottom of the sleeve a filter area is provided with a plurality of through holes, which are introduced for example by means of laser drilling.
  • a fuel injection valve is already known, in which a disc-shaped throttle element is introduced as an independent insert in the interior of a filter element.
  • the filter element is pressed into the inlet-side fuel supply of the fuel injection valve.
  • the function integration relates insofar as the filtering of the fuel and the damping of pressure pulsations in an assembly, but not the function of a setting element for adjusting the spring force of a return spring.
  • the fuel injection valve according to the invention with the features of the main claim has the advantage that a setting element is used as a combined component in the fuel inlet that combines a high functional integration (adjustment of the spring force of the return spring, filtering the fuel, damping of pressure pulsations) in itself, the adjustment of a Sleeve is formed to the outside, which receives an insert in its interior and this safe and protected encloses and in the wall directly a filter function is integrated.
  • the filter region of the adjusting element provided in the sleeve has between 3000 and 17000 passage openings, which are introduced, for example, by means of laser drilling.
  • the cross-sectional area of the filter area as the sum of all cross-sections of the passage openings is greater than the cross-sectional area of the throttle bore of the throttle element.
  • a spring guide can be integrated in a particularly simple and cost-effective manner in the production of the sleeve of the adjusting element, without the need for additional components.
  • the cost of manufacturing the adjustment can be kept low in this way.
  • the internal geometries of the inner pole and the connecting sleeve can be made simplified; the tolerance requirements can be lowered.
  • the spring guide integrated on the adjusting element according to the invention also has the advantage that the wear in the inner pole bore is markedly reduced compared with spring guides arranged directly in the inner pole.
  • FIG. 1 an axial section through a fuel injection valve according to the prior art
  • FIG. 2 an enlarged section of the in FIG. 1 shown fuel injection valve in the area II in FIG. 1 with an embodiment of the adjusting element according to the invention
  • FIG. 3 the adjustment in an outside view
  • FIG. 4 a cut-open adjustment according to FIG. 3
  • FIGS. 2 to 4 Embodiments of a fuel injection valve according to the invention will be described in more detail, is to better understand the invention first with reference to FIG. 1 an already known fuel injection valve will be briefly explained with respect to its essential components.
  • fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is operatively connected to a valve closing body 4 which cooperates with a valve seat body 6 arranged on a valve seat body 5 to form a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has at least one injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped. Upstream of the dial 15 is an armature 20. This is a non-positively connected via a first flange 21 with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by an adjusting sleeve 24 to bias.
  • Fuel channels 30, 31 and 32 extend in the upper valve needle guide 14, in the armature 20 and on a lower guide element 36.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 37 against a cylinder head, not shown.
  • a Vorhubfeder 38 is arranged, which holds the armature 20 in the resting state of the fuel injection valve 1 in abutment against the second flange 34.
  • the spring constant of the Vorhubfeder 38 is substantially smaller than the spring constant of the return spring 23rd
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 and the Vorhubfeder 38 against its stroke direction so that the valve closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which initially moves the armature 20 counter to the spring force of the prestroke spring 38 in the stroke direction, wherein an anchor free travel is predetermined by the distance between the first flange 21 and the armature 20. After passing through the armature free passage, the armature 20 takes the first flange 21, which is welded to the valve needle 3, against the spring force of the return spring 23 also in the stroke direction with.
  • the armature 20 passes through a total stroke, which corresponds to the height of the working gap 27 between the armature 20 and the inner pole 13.
  • the valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6, and the fuel guided via the fuel channels 30 to 32 is sprayed through the injection opening 7.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the Valve-closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • the Vorhubfeder 38 then acts on the armature 20 again so that it does not rebound from the second flange 34, but returns to the rest state without Anschlagspreller.
  • the inner pole 13 is made sleeve-shaped towards the inlet end of the fuel injection valve 1 and thus forms a connecting sleeve 40 in this area.
  • the connecting sleeve 40 can also be formed as a separate component independently of the inner pole 13, into which then e.g. the inner pole 13 is fitted.
  • the filter element 25 is introduced, which serves to filter out such particles in the fuel, which could otherwise lead to functional impairments of the relevant valve components such as the sealing seat.
  • the electromagnetic circuit may e.g. be replaced by a piezoelectric actuator or a magnetostrictive actuator as an actuator.
  • FIG. 2 shows in a partial axial sectional view of the in FIG. 1
  • an adjustment 50 which is designed as a combined component and at least the functions of the adjusting sleeve 24 and the filter element 25 combines.
  • the adjustment element 50 itself only consists of two parts.
  • the outer sheath of the adjusting element 50 forms a metal sleeve 51, which is executed, for example, multi-stepped and manufactured by deep drawing.
  • the thin-walled sleeve 51 has a radially enlarged region 61 in an inlet-side section, for example, which represents the diameter-largest region of the adjustment element 50.
  • the axially succeeding outflow-side portion is the smallest diameter portion 62 of the adjustment member 50, but is only slightly smaller in outer diameter than the pressing portion 55 and acts as a filter portion 62.
  • the filter element is thus integrated directly; an additional screen member as an insert for the adjustment member 50 is not required.
  • the filter portion 62 is characterized in that a plurality of through holes 63 are provided in it.
  • the filter region 62 in the sleeve 51 of the adjusting element 50 has between 3000 and 17000 through-openings 63.
  • the cross-sectional area of the filter region 62 is the sum of all cross sections of the Throughput openings 63 are larger than the cross-sectional area of a throttle bore 54 of a throttle element 56 integrated in the adjustment element 50.
  • the passage openings 63 are ideally introduced by means of laser drilling in the wall of the sleeve 51.
  • a throttle bore 54 which has an opening cross section which is smaller by a multiple than the opening cross section of the connecting sleeve 40 and the inner pole 13.
  • the throttle bore 54 has, for example, a diameter of 0.4 mm to 1.5 mm, depending on the opening width of the connecting sleeve 40.
  • the throttle bore 54 is introduced in a separate insert, which is designed as a disk-shaped throttle element 56.
  • the throttle element 56 is accommodated at least partially in the radially enlarged region 61 of the thin-walled sleeve 51.
  • the sleeve 51 is designed conically projecting above the pressing area 55 with a bulge 60. Since the throttle element 56 is itself provided with a conical lateral surface at least in a partial region, the throttle element 56 can be received in a form-fitting manner in the area of the bulge 60 of the radially enlarged region 61 of the sleeve 51.
  • connection region can be secured in that a welded connection 69 in the form of a peripheral seam or several stitching points in the area of the bulge 60 is produced.
  • the welded joint 69 can optionally by laser, roll, resistance welding o.ä. Joining methods are produced.
  • the edge region of the throttle element 56 is sealed so far that a bypass to the throttle bore 54 is prevented.
  • the throttle member 56 has, for example, an upstream side portion 66 smaller in diameter than the portion corresponding to the radially enlarged portion 61 of the sleeve 51 and protruding from the sleeve 51.
  • the radially enlarged region 61 of the sleeve 51 can also be cylindrical, so that in this case also the throttle element 56 has a cylindrical insertion region.
  • the lower, downstream end of the adjusting element 50 is formed by a pin-like guide means 67, which adjoins the filter portion 62, but has a significantly smaller diameter and the guide of the return spring 23 is used, so that advantageously a further function in the adjustment 50th is integrated.
  • the adjusting element 50 is guided into the inner pole 13, in which case the return spring 23 is finally adjusted to a desired pre-press dimension via the pressing region 55.
  • the connecting sleeve 40 is inserted over the protruding upper end of the adjusting element 50.
  • FIG. 3 shows the adjustment 50 in an external view.
  • the design of the sleeve 51 which seen over its axial length has a plurality of regions 55, 61, 62, which have a different outer diameter.
  • the throttle element 56 may ideally be a simple, precisely made in outer and inner diameter disc with parallel end faces.
  • FIG. 4 is the adjustment 50 according to FIG. 3 shown in a sectional view.
  • the throttle element 56 is designed disc-shaped and stepped and is the inlet side of the sleeve 51 on the bulge 60 of the sleeve 51 out.
  • the protruding pin-like portion 66 has a significantly smaller outer diameter than the outer diameter of which is located within the sleeve 51 portion of the throttle element 56th
  • the invention is not limited to the illustrated embodiments and also in a variety of other designs of fuel injection valves compared to those in FIG. 1 shown design of the fuel injection valve feasible.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.

Aus der DE 40 03 228 A1 ist ein Brennstoffeinspritzventil bekannt, bei dem ein Brennstofffilter am zulaufseitigen Ende des Brennstoffeinspritzventils in den Brennstoffeinlassstutzen eingepresst ist. Dieser Brennstofffilter ist am Umfang beispielsweise mit einem Messingring versehen, der mit der Wandung des Brennstoffeinlassstutzens die Paarung beim Einpressen des Brennstofffilters bildet. Der Messingring umgibt einen ringförmigen Kunststoffmassivabschnitt des Grundkörpers des Brennstofffilters, von dem aus z.B. drei Stege in Längsrichtung bis zu einem gemeinsamen Bodenabschnitt verlaufen, von denen das eigentliche Siebgewebe in diesen Teilbereichen umspritzt ist. Eine Einstellhülse stromabwärts des Brennstofffilters dient zur Einstellung der Federvorspannung einer an der Einstellhülse anliegenden Rückstellfeder.From the DE 40 03 228 A1 For example, a fuel injector is known in which a fuel filter is press-fitted into the fuel inlet port at the upstream end of the fuel injector. This fuel filter is provided at the periphery, for example, with a brass ring which forms the mating with the wall of the Brennstoffeinlassstutzens when pressing the fuel filter. The brass ring surrounds an annular solid plastic section of the main body of the fuel filter, from which extend, for example, three webs in the longitudinal direction to a common bottom portion, of which the actual screen mesh is encapsulated in these sub-areas. An adjusting sleeve downstream of the fuel filter is used to adjust the spring bias of a voltage applied to the adjusting return spring.

Bekannt sind desweiteren bereits Brennstoffeinspritzventile, bei denen die Einstellhülse und der Brennstofffilter als ein so genanntes Kombibauteil vorliegen, also die beiden Funktionen der Einstellung der Federvorspannung einer an der Einstellhülse anliegenden Rückstellfeder und die Filterung des einströmenden Brennstoffs in einem Bauteil integriert sind ( US 5,335,863 A , US 6,434,822 B1 , EP 1 296 057 B1 , EP 2 426 351 A1 , EP 1 377 747 A1 ). Alle bekannten Lösungen zeichnen sich dadurch aus, dass ein Pressbereich im Bereich der Einstellhülse vorgesehen ist, der mit der Wandung des sie umgebenden Anschlussstutzens eine Presspassung eingeht, die so eng gewählt ist, dass über die Lebensdauer des Brennstoffeinspritzventils die Federspannung konstant gehalten bleibt, also ein Verrutschen der Einstellhülse ausgeschlossen ist.Furthermore fuel injectors are already known in which the adjusting sleeve and the fuel filter are present as a so-called combination component, ie the two functions of adjusting the spring preload of a restoring spring resting against the adjusting sleeve and the filtering of the incoming fuel are integrated in one component ( US 5,335,863 A . US Pat. No. 6,434,822 B1 . EP 1 296 057 B1 . EP 2 426 351 A1 . EP 1 377 747 A1 ). All known solutions are characterized by the fact that a pressing area is provided in the adjustment sleeve, which enters into a press fit with the wall of the surrounding connecting piece, which is chosen so tight that over the life of the fuel injection valve, the spring tension remains constant, so a Slipping of the adjusting sleeve is excluded.

Aus der EP1806497A1 ist bereits ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen, insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine bekannt. Das Ventil besitzt einen Aktuator, durch dessen Erregung eine Hubbewegung einer Ventilnadel erzielbar ist, wodurch eine Betätigung eines Ventilschließkörpers, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet, ermöglicht ist. Außerdem weist das Ventil eine zulaufseitige Brennstoffzufuhr auf, wobei in dem Brennstoffzulauf ein Einstellelement zur Einstellung der Federkraft einer Rückstellfeder angeordnet ist und wobei das Einstellelement von einer Hülse nach außen begrenzt ist und in der Wandung und im Boden der Hülse ein Filterbereich mit einer Vielzahl von Durchgangsöffnungen vorgesehen ist, die beispielsweise mittels Laserbohren eingebracht sind.From the EP1806497A1 is already a fuel injection valve for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into the combustion chamber of an internal combustion engine known. The valve has an actuator, by the excitation of a lifting movement of a valve needle is achieved, whereby actuation of a valve closing body, which forms a sealing seat together with a valve seat surface, is made possible. In addition, the valve has an inlet-side fuel supply, wherein in the fuel inlet, an adjusting element for adjusting the spring force of a return spring is arranged and wherein the adjusting element is bounded by a sleeve to the outside and in the wall and in the bottom of the sleeve a filter area is provided with a plurality of through holes, which are introduced for example by means of laser drilling.

Aus der DE102009000183A1 ist bereits ein Brennstoffeinspritzventil bekannt, bei dem im Inneren eines Filterelements ein scheibenförmiges Drosselelement als eigenständiges Einlegeteil eingebracht ist. Das Filterelement ist in die zulaufseitige Brennstoffzufuhr des Brennstoffeinspritzventils eingepresst. Die Funktionsintegration betrifft insofern das Filtern des Brennstoffs sowie das Dämpfen von Druckpulsationen in einer Baugruppe, nicht jedoch die Funktion eines Einstellelements zur Einstellung der Federkraft einer Rückstellfeder.From the DE102009000183A1 A fuel injection valve is already known, in which a disc-shaped throttle element is introduced as an independent insert in the interior of a filter element. The filter element is pressed into the inlet-side fuel supply of the fuel injection valve. The function integration relates insofar as the filtering of the fuel and the damping of pressure pulsations in an assembly, but not the function of a setting element for adjusting the spring force of a return spring.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Hauptanspruchs hat den Vorteil, dass ein Einstellelement als Kombibauteil im Brennstoffzulauf eingesetzt ist, dass eine hohe Funktionsintegration (Einstellung der Federkraft der Rückstellfeder, Filterung des Brennstoffs, Dämpfung von Druckpulsationen) in sich vereint, wobei das Einstellelement von einer Hülse nach außen hin gebildet ist, die ein Einlegeteil in ihrem Inneren aufnimmt und dieses sicher und geschützt umschließt und in deren Wandung unmittelbar eine Filterfunktion integriert ist.The fuel injection valve according to the invention with the features of the main claim has the advantage that a setting element is used as a combined component in the fuel inlet that combines a high functional integration (adjustment of the spring force of the return spring, filtering the fuel, damping of pressure pulsations) in itself, the adjustment of a Sleeve is formed to the outside, which receives an insert in its interior and this safe and protected encloses and in the wall directly a filter function is integrated.

Mit sehr geringen Zusatzkosten und zudem einfach herstellbar ist durch das Einbringen eines scheibenförmigen Drosselelements mit einer integrierten Drosselbohrung in dem Einstellelement eine erhebliche Geräuschreduzierung gegenüber Brennstoffeinspritzventilen ähnlicher Bauart und vergleichbarer konstruktiver Ausgestaltung erzielbar.With very low additional costs and also easy to produce is achieved by introducing a disc-shaped throttle element with an integrated throttle bore in the adjustment a significant noise reduction over fuel injectors similar design and comparable structural design.

Da in idealer Weise in dem Einstellelement ein Filterelement integriert ist, ist die höchste denkbare Funktionsintegration an dem erfindungsgemäßen Einstellelement vorgenommen.Since a filter element is ideally integrated in the adjusting element, the highest conceivable functional integration is made on the adjusting element according to the invention.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim fuel injector are possible.

In vorteilhafter Weise weist der in der Hülse vorgesehene Filterbereich des Einstellelements zwischen 3000 und 17000 Durchgangsöffnungen auf, die beispielsweise mittels Laserbohren eingebracht sind. Dabei ist die Querschnittsfläche des Filterbereichs als Summe aller Querschnitte der Durchgangsöffnungen größer als die Querschnittsfläche der Drosselbohrung des Drosselelements.In an advantageous manner, the filter region of the adjusting element provided in the sleeve has between 3000 and 17000 passage openings, which are introduced, for example, by means of laser drilling. In this case, the cross-sectional area of the filter area as the sum of all cross-sections of the passage openings is greater than the cross-sectional area of the throttle bore of the throttle element.

In vorteilhafter Weise kann eine Federführung besonders einfach und kostengünstig bei der Herstellung der Hülse des Einstellelements direkt mit integriert werden, ohne dass zusätzliche Bauteile erforderlich wären. Die Kosten der Herstellung des Einstellelements können auf diese Weise niedrig gehalten werden. Die Innengeometrien des Innenpols und der Anschlusshülse können vereinfacht gefertigt werden; die Toleranzanforderungen können gesenkt werden. Die am Einstellelement erfindungsgemäß integrierte Federführung hat zudem den Vorteil, dass in der Innenpolbohrung der Verschleiß gegenüber direkt im Innenpol angeordneter Federführungen deutlich herabgesetzt ist.Advantageously, a spring guide can be integrated in a particularly simple and cost-effective manner in the production of the sleeve of the adjusting element, without the need for additional components. The cost of manufacturing the adjustment can be kept low in this way. The internal geometries of the inner pole and the connecting sleeve can be made simplified; the tolerance requirements can be lowered. The spring guide integrated on the adjusting element according to the invention also has the advantage that the wear in the inner pole bore is markedly reduced compared with spring guides arranged directly in the inner pole.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen axialen Schnitt durch ein Brennstoffeinspritzventil gemäß dem Stand der Technik, Figur 2 einen vergrößerten Ausschnitt aus dem in Figur 1 dargestellten Brennstoffeinspritzventil im Bereich II in Figur 1 mit einer erfindungsgemäßen Ausgestaltung des Einstellelements, Figur 3 das Einstellelement in einer Außenansicht und Figur 4 ein aufgeschnittenes Einstellelement gemäß Figur 3.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 an axial section through a fuel injection valve according to the prior art, FIG. 2 an enlarged section of the in FIG. 1 shown fuel injection valve in the area II in FIG. 1 with an embodiment of the adjusting element according to the invention, FIG. 3 the adjustment in an outside view and FIG. 4 a cut-open adjustment according to FIG. 3 ,

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bevor anhand der Figuren 2 bis 4 Ausführungsbeispiele eines erfindungsgemäßen Brennstoffeinspritzventils näher beschrieben werden, soll zum besseren Verständnis der Erfindung zunächst anhand von Figur 1 ein bereits bekanntes Brennstoffeinspritzventil bezüglich seiner wesentlichen Bauteile kurz erläutert werden.Before using the FIGS. 2 to 4 Embodiments of a fuel injection valve according to the invention will be described in more detail, is to better understand the invention first with reference to FIG. 1 an already known fuel injection valve will be briefly explained with respect to its essential components.

Das in Figur 1 dargestellte Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.This in FIG. 1 shown fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht mit einem Ventilschließkörper 4 in Wirkverbindung, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über wenigstens eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen einen Außenpol 9 einer Magnetspule 10 abgedichtet. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch eine Verengung 26 voneinander getrennt und miteinander durch ein nicht ferromagnetisches Verbindungsbauteil 29 verbunden. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged. The valve needle 3 is operatively connected to a valve closing body 4 which cooperates with a valve seat body 6 arranged on a valve seat body 5 to form a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has at least one injection opening 7. The nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.

Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. Stromaufwärts der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen ersten Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem ersten Flansch 21 verbunden ist. Auf dem ersten Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Einstellhülse 24 auf Vorspannung gebracht wird.The valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped. Upstream of the dial 15 is an armature 20. This is a non-positively connected via a first flange 21 with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by an adjusting sleeve 24 to bias.

In der oberen Ventilnadelführung 14, im Anker 20 und an einem unteren Führungselement 36 verlaufen Brennstoffkanäle 30, 31 und 32. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Brennstoffverteilerleitung und durch eine weitere Dichtung 37 gegen einen nicht weiter dargestellten Zylinderkopf abgedichtet. Zwischen dem ersten Flansch 21 und dem Anker 20 ist eine Vorhubfeder 38 angeordnet, welche den Anker 20 im Ruhezustand des Brennstoffeinspritzventils 1 in Anlage an dem zweiten Flansch 34 hält. Die Federkonstante der Vorhubfeder 38 ist dabei wesentlich kleiner als die Federkonstante der Rückstellfeder 23.Fuel channels 30, 31 and 32 extend in the upper valve needle guide 14, in the armature 20 and on a lower guide element 36. The fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. The fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 37 against a cylinder head, not shown. Between the first flange 21 and the armature 20 a Vorhubfeder 38 is arranged, which holds the armature 20 in the resting state of the fuel injection valve 1 in abutment against the second flange 34. The spring constant of the Vorhubfeder 38 is substantially smaller than the spring constant of the return spring 23rd

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 und der Vorhubfeder 38 entgegen seiner Hubrichtung so beaufschlagt, dass der Ventilschließkörper 4 an der Ventilsitzfläche 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 zunächst entgegen der Federkraft der Vorhubfeder 38 in Hubrichtung bewegt, wobei ein Ankerfreiweg durch den Abstand zwischen dem ersten Flansch 21 und dem Anker 20 vorgegeben ist. Nach Durchlaufen des Ankerfreiwegs nimmt der Anker 20 den ersten Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, entgegen der Federkraft der Rückstellfeder 23 ebenfalls in Hubrichtung mit. Der Anker 20 durchläuft dabei einen Gesamthub, der der Höhe des Arbeitsspaltes 27 zwischen dem Anker 20 und dem Innenpol 13 entspricht. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, und der über die Brennstoffkanäle 30 bis 32 geführte Brennstoff wird durch die Abspritzöffnung 7 abgespritzt.In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 and the Vorhubfeder 38 against its stroke direction so that the valve closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which initially moves the armature 20 counter to the spring force of the prestroke spring 38 in the stroke direction, wherein an anchor free travel is predetermined by the distance between the first flange 21 and the armature 20. After passing through the armature free passage, the armature 20 takes the first flange 21, which is welded to the valve needle 3, against the spring force of the return spring 23 also in the stroke direction with. The armature 20 passes through a total stroke, which corresponds to the height of the working gap 27 between the armature 20 and the inner pole 13. The valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6, and the fuel guided via the fuel channels 30 to 32 is sprayed through the injection opening 7.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Verbindung stehende erste Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird. Die Vorhubfeder 38 beaufschlagt den Anker 20 dann wiederum so, dass dieser nicht von dem zweiten Flansch 34 zurückprellt, sondern ohne Anschlagspreller in den Ruhezustand zurückkehrt.If the coil current is turned off, the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, whereby the Valve-closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed. The Vorhubfeder 38 then acts on the armature 20 again so that it does not rebound from the second flange 34, but returns to the rest state without Anschlagspreller.

Der Innenpol 13 ist zum Zulaufende des Brennstoffeinspritzventils 1 hin hülsenförmig ausgeführt und bildet insofern in diesem Bereich eine Anschlusshülse 40. Die Anschlusshülse 40 kann auch als separates Bauteil unabhängig vom Innenpol 13 ausgeformt sein, in die dann z.B. der Innenpol 13 eingepasst ist. Im Bereich der Anschlusshülse 40 ist das Filterelement 25 eingebracht, das der Herausfiltrierung solcher Partikel im Brennstoff dient, die ansonsten zu Funktionsbeeinträchtigungen an den relevanten Ventilbauteilen wie dem Dichtsitz führen könnten.The inner pole 13 is made sleeve-shaped towards the inlet end of the fuel injection valve 1 and thus forms a connecting sleeve 40 in this area. The connecting sleeve 40 can also be formed as a separate component independently of the inner pole 13, into which then e.g. the inner pole 13 is fitted. In the region of the connecting sleeve 40, the filter element 25 is introduced, which serves to filter out such particles in the fuel, which could otherwise lead to functional impairments of the relevant valve components such as the sealing seat.

Der elektromagnetische Kreis kann z.B. auch durch einen Piezoaktor oder einen magnetostriktiven Aktor als Aktuator ersetzt werden.The electromagnetic circuit may e.g. be replaced by a piezoelectric actuator or a magnetostrictive actuator as an actuator.

Figur 2 zeigt in einer auszugsweisen axialen Schnittdarstellung den in Figur 1 mit II bezeichneten Ausschnitt als ein erfindungsgemäßes Ausführungsbeispiel eines Einstellelements 50, das als Kombibauteil ausgeführt ist und zumindest die Funktionen der Einstellhülse 24 und des Filterelements 25 vereint. Das Einstellelement 50 besteht dabei selbst nur aus zwei Einzelteilen. So bildet die äußere Ummantelung des Einstellelements 50 eine metallene Hülse 51, die z.B. mehrfach gestuft ausgeführt ist und mittels Tiefziehen hergestellt ist. Die dünnwandige Hülse 51 weist dabei z.B. in einem zulaufseitigen Abschnitt einen radial vergrößerten Bereich 61 auf, der den durchmessergrößten Bereich des Einstellelements 50 darstellt. In axialer Richtung schließt sich daran ein durchmesserkleinerer Bereich an, der als Pressbereich 55 dient. Der axial darauffolgende abströmseitige Abschnitt ist der durchmesserkleinste Bereich 62 des Einstellelements 50, der aber nur geringfügig kleiner im Außendurchmesser ist als der Pressbereich 55 und als Filterbereich 62 fungiert. FIG. 2 shows in a partial axial sectional view of the in FIG. 1 With II designated section as an inventive embodiment of an adjustment 50, which is designed as a combined component and at least the functions of the adjusting sleeve 24 and the filter element 25 combines. The adjustment element 50 itself only consists of two parts. Thus, the outer sheath of the adjusting element 50 forms a metal sleeve 51, which is executed, for example, multi-stepped and manufactured by deep drawing. In this case, the thin-walled sleeve 51 has a radially enlarged region 61 in an inlet-side section, for example, which represents the diameter-largest region of the adjustment element 50. In the axial direction is followed by a smaller-diameter area, which serves as a pressing portion 55. The axially succeeding outflow-side portion is the smallest diameter portion 62 of the adjustment member 50, but is only slightly smaller in outer diameter than the pressing portion 55 and acts as a filter portion 62.

In der tiefgezogenen Hülse 51 ist insofern das Filterelement unmittelbar integriert; ein zusätzliches Siebteil als Einsatz für das Einstellelement 50 ist nicht erforderlich. Der Filterbereich 62 zeichnet sich dadurch aus, dass eine Vielzahl von Durchgangsöffnungen 63 in ihm vorgesehen ist. Um einen möglichst großen, nicht drosselnden Durchfluss durch die filternden Durchgangsöffnungen 63 zu ermöglichen, weist der Filterbereich 62 in der Hülse 51 des Einstellelements 50 zwischen 3000 und 17000 Durchgangsöffnungen 63 auf. Die Querschnittsfläche des Filterbereichs 62 ist dabei als Summe aller Querschnitte der Durchgangsöffnungen 63 größer als die Querschnittsfläche einer Drosselbohrung 54 eines im Einstellelement 50 integrierten Drosselelements 56. In konkreten Zahlen ausgedrückt, bedeutet dies, dass die Querschnittsfläche des Filterbereichs 62 als Summe aller Querschnitte der Durchgangsöffnungen 63 je nach Auslegung zwischen 1 mm2 und 10 mm2 beträgt. Die Durchgangsöffnungen 63 werden idealerweise mittels Laserbohren in der Wandung der Hülse 51 eingebracht.In the deep-drawn sleeve 51, the filter element is thus integrated directly; an additional screen member as an insert for the adjustment member 50 is not required. The filter portion 62 is characterized in that a plurality of through holes 63 are provided in it. In order to allow the largest possible non-throttling flow through the filtering through-openings 63, the filter region 62 in the sleeve 51 of the adjusting element 50 has between 3000 and 17000 through-openings 63. The cross-sectional area of the filter region 62 is the sum of all cross sections of the Throughput openings 63 are larger than the cross-sectional area of a throttle bore 54 of a throttle element 56 integrated in the adjustment element 50. Expressed in concrete terms, this means that the cross-sectional area of the filter region 62 as the sum of all cross-sections of the passage openings 63 is between 1 mm 2 and 10 mm 2 , depending on the design , The passage openings 63 are ideally introduced by means of laser drilling in the wall of the sleeve 51.

Insbesondere bei Hochdruckeinspritzventilen, die z.B. mit einem Brennstoffdruck von > 100 bar versorgt werden, hat sich gezeigt, dass es im Betrieb zu einer erheblichen Geräuschentwicklung kommt, die als z.T. störend empfunden werden kann. Eine wirksame Geräuschreduzierung erfolgt dadurch, dass im Zulaufbereich des Einstellelements 50 eine Drosselbohrung 54 vorgesehen ist, die einen Öffnungsquerschnitt besitzt, der um ein Vielfaches kleiner ist als der Öffnungsquerschnitt der Anschlusshülse 40 bzw. des Innenpols 13. Die Drosselbohrung 54 besitzt dabei z.B. einen Durchmesser von 0,4 mm bis 1,5 mm je nach Öffnungsweite der Anschlusshülse 40. Mit Hilfe der Drosselbohrung 54 kann eine gezielte Dämpfung von Druckpulsationen im Inneren des Brennstoffeinspritzventils erfolgen. Die Drosselbohrung 54 ist in einem eigenständigen Einlegeteil eingebracht, das als scheibenförmiges Drosselelement 56 ausgeführt ist. Das Drosselelement 56 ist zumindest teilweise im radial vergrößerten Bereich 61 der dünnwandigen Hülse 51 untergebracht. Zur sicheren Aufnahme des Drosselelements 56 ist die Hülse 51 oberhalb des Pressbereichs 55 konisch auskragend mit einer Auftulpung 60 ausgeführt. Da das Drosselelement 56 zumindest in einem Teilbereich selbst mit einer konischen Mantelfläche versehen ist, kann das Drosselelement 56 formschlüssig im Bereich der Auftulpung 60 des radial vergrößerten Bereichs 61 der Hülse 51 aufgenommen werden. Zusätzlich gesichert kann dieser Verbindungsbereich dadurch sein, dass eine Schweißverbindung 69 in Form einer umlaufenden Naht oder mehrerer Heftpunkte im Bereich der Auftulpung 60 erzeugt wird. Die Schweißverbindung 69 kann wahlweise durch Laser-, Roll-, Widerstandsschweißen o.ä. Fügeverfahren hergestellt werden. Der Randbereich des Drosselelements 56 ist dabei so weit abgedichtet ist, dass ein Bypass zu der Drosselbohrung 54 verhindert ist. Das Drosselelement 56 besitzt beispielsweise einen zulaufseitigen Abschnitt 66, der durchmessserkleiner ist als der Bereich, der mit dem radial vergrößerten Bereich 61 der Hülse 51 korrespondiert, und der aus der Hülse 51 heraussteht. Alternativ zur konisch auskragenden Auftulpung 60 kann der radial vergrößerte Bereich 61 der Hülse 51 auch zylindrisch ausgeführt sein, so dass in diesem Falle auch das Drosselelement 56 einen zylindrischen Einschubbereich aufweist.Particularly in the case of high-pressure injection valves, which are supplied, for example, with a fuel pressure of> 100 bar, it has been shown that during operation a considerable noise development occurs, which can be perceived as partly disturbing. An effective noise reduction takes place in that in the inlet region of the adjusting element 50, a throttle bore 54 is provided, which has an opening cross section which is smaller by a multiple than the opening cross section of the connecting sleeve 40 and the inner pole 13. The throttle bore 54 has, for example, a diameter of 0.4 mm to 1.5 mm, depending on the opening width of the connecting sleeve 40. With the aid of the throttle bore 54, a targeted damping of pressure pulsations in the interior of the fuel injection valve can take place. The throttle bore 54 is introduced in a separate insert, which is designed as a disk-shaped throttle element 56. The throttle element 56 is accommodated at least partially in the radially enlarged region 61 of the thin-walled sleeve 51. For secure reception of the throttle element 56, the sleeve 51 is designed conically projecting above the pressing area 55 with a bulge 60. Since the throttle element 56 is itself provided with a conical lateral surface at least in a partial region, the throttle element 56 can be received in a form-fitting manner in the area of the bulge 60 of the radially enlarged region 61 of the sleeve 51. In addition, this connection region can be secured in that a welded connection 69 in the form of a peripheral seam or several stitching points in the area of the bulge 60 is produced. The welded joint 69 can optionally by laser, roll, resistance welding o.ä. Joining methods are produced. The edge region of the throttle element 56 is sealed so far that a bypass to the throttle bore 54 is prevented. The throttle member 56 has, for example, an upstream side portion 66 smaller in diameter than the portion corresponding to the radially enlarged portion 61 of the sleeve 51 and protruding from the sleeve 51. As an alternative to the conically projecting upturn 60, the radially enlarged region 61 of the sleeve 51 can also be cylindrical, so that in this case also the throttle element 56 has a cylindrical insertion region.

Das untere, abströmseitige Ende des Einstellelements 50 wird von einem zapfenartigen Führungsmittel 67 gebildet, das sich an den Filterbereich 62 anschließt, aber einen deutlich kleineren Durchmesser aufweist und der Führung der Rückstellfeder 23 dient, so dass in vorteilhafter Weise eine weitere Funktion in dem Einstellelement 50 integriert ist.The lower, downstream end of the adjusting element 50 is formed by a pin-like guide means 67, which adjoins the filter portion 62, but has a significantly smaller diameter and the guide of the return spring 23 is used, so that advantageously a further function in the adjustment 50th is integrated.

Während des Montageprozesses wird das Einstellelement 50 in den Innenpol 13 geführt, wobei dann letztlich über den Pressbereich 55 die Rückstellfeder 23 auf ein gewünschtes Voreinpressmaß eingestellt wird. Bei der Montage der Anschlusshülse 40 wird die Anschlusshülse 40 über das hinausstehende obere Ende des Einstellelements 50 gesteckt. Nach dieser Montage und der Verschweißung der Anschlusshülse 40 am Innenpol 13 können schlussendlich durch Verschieben des Einstellelements 50 die dynamische Abspritzmenge und die Federkraft der Rückstellfeder 23 endgültig fest eingestellt werden.During the assembly process, the adjusting element 50 is guided into the inner pole 13, in which case the return spring 23 is finally adjusted to a desired pre-press dimension via the pressing region 55. When mounting the connecting sleeve 40, the connecting sleeve 40 is inserted over the protruding upper end of the adjusting element 50. After this assembly and the welding of the connecting sleeve 40 at the inner pole 13 can finally be adjusted by moving the adjusting member 50, the dynamic spray rate and the spring force of the return spring 23 final.

Figur 3 zeigt das Einstellelement 50 in einer Außenansicht. Dabei wir die Ausbildung der Hülse 51 deutlich, die über ihre axiale Länge gesehen mehrere Bereiche 55, 61, 62 aufweist, die einen unterschiedlichen Außendurchmesser haben. Das Drosselelement 56 kann in idealer Weise eine einfache, präzis im Außen- und Innendurchmesser hergestellte Scheibe mit parallel verlaufenden Stirnseiten sein. FIG. 3 shows the adjustment 50 in an external view. In this case, we clearly see the design of the sleeve 51, which seen over its axial length has a plurality of regions 55, 61, 62, which have a different outer diameter. The throttle element 56 may ideally be a simple, precisely made in outer and inner diameter disc with parallel end faces.

In Figur 4 ist das Einstellelement 50 gemäß Figur 3 in einer Schnittdarstellung gezeigt. Das Drosselelement 56 ist scheibenförmig und gestuft ausgeführt und steht zulaufseitig aus der Hülse 51 über die Auftulpung 60 der Hülse 51 heraus. Der hinausstehende zapfenartige Abschnitt 66 weist einen deutlich geringeren Außendurchmesser auf als den Außendurchmesser des innerhalb der Hülse 51 liegenden Abschnitts des Drosselelements 56.In FIG. 4 is the adjustment 50 according to FIG. 3 shown in a sectional view. The throttle element 56 is designed disc-shaped and stepped and is the inlet side of the sleeve 51 on the bulge 60 of the sleeve 51 out. The protruding pin-like portion 66 has a significantly smaller outer diameter than the outer diameter of which is located within the sleeve 51 portion of the throttle element 56th

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und auch bei einer Vielzahl anderer Bauweisen von Brennstoffeinspritzventilen im Vergleich zu der in Figur 1 gezeigten Bauform des Brennstoffeinspritzventils realisierbar.The invention is not limited to the illustrated embodiments and also in a variety of other designs of fuel injection valves compared to those in FIG. 1 shown design of the fuel injection valve feasible.

Claims (11)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into the combustion chamber of an internal combustion engine, having an actuator (9, 10, 13, 20), by way of the excitation of which a stroke movement of a valve needle (3) can be realized, thus permitting an actuation of a valve closing body (4) which, together with a valve seat surface (6), forms a sealing seat, and having an inflow-side fuel feed (16), wherein, in the fuel inflow, there is arranged a setting element (50) for setting the spring force of a restoring spring (23), wherein the setting element (50) is delimited to the outside by a sleeve (51), wherein a filter region (62) with a multiplicity of through-openings (63) is provided in the wall of the sleeve (51),
    characterized in that
    a throttle element (56) is introduced in the interior of the sleeve (51) as an independent insert, wherein the throttle element (56) is accommodated at least partially in a radially enlarged region (61) of the sleeve (51), and the sleeve (51) is designed so as to conically project with a flare (60) for securely receiving the throttle element (56), such that the throttle element (56), which is provided at least partially with a conical lateral surface, is received in a form-fitting manner in the region of the flare (60) of the sleeve (51).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the sleeve (51) is a thin-walled, deep-drawn component.
  3. Fuel injection valve according to Claim 1 or 2,
    characterized
    in that, in the throttle element (56), there is provided a flow throttle in the form of a throttle bore (54) which has an opening cross section which is several times smaller than the opening cross section of the fuel feed (16).
  4. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the throttle element (56) has a disc-shaped form.
  5. Fuel injection valve according to Claim 4,
    characterized
    in that the throttle element (56) protrudes out of the sleeve (51) with a portion (66).
  6. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the throttle element (56) is introduced on the inflow side into the sleeve (51) of the setting element (50).
  7. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the sleeve (51) has, as viewed over its axial length, a plurality of regions (55, 61, 62) which have a different outer diameter.
  8. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the filter region (62) in the sleeve (51) of the setting element (50) has between 3000 and 17000 through-openings (63).
  9. Fuel injection valve according to Claim 8,
    characterized
    in that the cross-sectional area of the filter region (62), as the sum total of all cross sections of the through-openings (63), is greater than the cross-sectional area of the throttle bore (54) of the throttle element (56).
  10. Fuel injection valve according to Claim 9,
    characterized
    in that the cross-sectional area of the filter region (62), as the sum total of all cross sections of the through-openings (63), is between 1 mm2 and 10 mm2.
  11. Fuel injection valve according to one of the preceding claims,
    characterized
    in that means (67) which serve for guiding the restoring spring (23) are provided on the sleeve (51) .
EP15191378.7A 2014-12-16 2015-10-26 Fuel injector valve Active EP3034856B1 (en)

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DE102016226135A1 (en) * 2016-12-23 2018-06-28 Robert Bosch Gmbh Fuel injector

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DE4003228A1 (en) 1990-02-03 1991-08-22 Bosch Gmbh Robert ELECTROMAGNETICALLY ACTUABLE VALVE
US5335863A (en) 1993-05-03 1994-08-09 Siemens Automotive L.P. Filter cartridge mounting for a top-feed fuel injector
US6434822B1 (en) 2000-09-13 2002-08-20 Delphi Technologies, Inc. Method of fuel injector assembly
DE10109410A1 (en) 2001-02-28 2002-09-05 Bosch Gmbh Robert Fuel injector
DE10220632A1 (en) * 2001-05-10 2002-12-12 Denso Corp Filter in fuel injection device has body with cylindrical sector perforated by holes arranged in spiral round cylindrical sector
CA2404247C (en) 2001-09-19 2006-06-20 Filtertek Inc. Integrated fuel filter and calibration tube for a fuel injector
DE602006018105D1 (en) * 2006-01-10 2010-12-23 Continental Automotive Gmbh Fuel injection valve
EP2000662B1 (en) * 2007-06-04 2012-03-14 Continental Automotive GmbH Adjusting and filter arrangement for an injection valve and injection valve
DE102009000183A1 (en) * 2009-01-13 2010-07-15 Robert Bosch Gmbh Fuel injection valve for fuel injection systems of internal combustion engines, particularly for direct injection of fuel in combustion chamber of internal combustion engine, has actuator and flow choke provided in fuel supply
EP2426351B1 (en) 2010-09-02 2014-11-12 Continental Automotive GmbH Adjusting fuel filter assembly and injection valve
EP2811151A1 (en) * 2013-06-04 2014-12-10 Continental Automotive GmbH Filter for a fuel injection valve, fuel injection valve and method for producing a filter for a fuel injection valve

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