EP3034857B1 - Fuel injector valve - Google Patents

Fuel injector valve Download PDF

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Publication number
EP3034857B1
EP3034857B1 EP15191415.7A EP15191415A EP3034857B1 EP 3034857 B1 EP3034857 B1 EP 3034857B1 EP 15191415 A EP15191415 A EP 15191415A EP 3034857 B1 EP3034857 B1 EP 3034857B1
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EP
European Patent Office
Prior art keywords
sleeve
fuel injection
injection valve
fuel
valve according
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
EP15191415.7A
Other languages
German (de)
French (fr)
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EP3034857A1 (en
Inventor
Buenyamin Duru
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication of EP3034857A1 publication Critical patent/EP3034857A1/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
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8092—Fuel injection apparatus manufacture, repair or assembly adjusting or calibration
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9023—Fibrous materials

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 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 two inserts inside it and encloses them safely and protected.
  • the filter element is made of a metal fabric by deep drawing in a dome or dome contour, which is very precisely inserted into the sleeve of the adjustment.
  • 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 adjusting element in an external view
  • FIG. 4 a cut-open adjustment according to FIG. 3
  • FIG. 5 an alternative embodiment of an adjustment in a sectional view.
  • FIGS. 2 to 5 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 is supported Return spring 23 from 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 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 adjusting element 50 consists of three individual 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 downstream side portion is the smallest diameter portion 63 of the adjusting member 50, but only slightly smaller in outer diameter than the pressing portion 55.
  • a filter element 62 is integrated, which is executed dom- or dome-like and consists of a metal fabric.
  • the metal mesh is designed so stiff that the dome filter is fixed as a filter element 62 in its contour unchangeable.
  • the filter element 62 has at its open end z. B. a larger diameter collar portion corresponding to the radially enlarged portion 61 of the sleeve 51.
  • the metal fabric of the dome-like filter element 62 is constructed, for example, of a Betamesh TM or square mesh or similar fabric structures.
  • the dome or dome contour of the filter element 62 can be achieved, for example, by deep drawing.
  • 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 or 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.
  • the filter element 62 also has a bulge 60 'in the upper collar region, which can be applied to the bulge 60 of the sleeve 51 from the inside.
  • the throttle element 56 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 bulges 60, 60 'of the radially enlarged region 61 of the sleeve 51 or of the filter element 62.
  • this connection region can be secured in that a welded connection 69 in the form of a circumferential seam or several stitching points in the area of the bulges 60, 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 element 56 has, for example, an inflow-side portion 66 which is smaller in diameter than the portion corresponding to the radially enlarged portion 61 of the sleeve 51 and protrudes from the sleeve 51.
  • the radially enlarged region 61 of the sleeve 51 can also be cylindrical, so that in this case the filter element 62 and the throttle element 56 also have a cylindrical insertion region.
  • a pressing is also conceivable as an alternative to welding.
  • 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, 63, 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 lying within the sleeve 51 portion of the throttle element 56.
  • connection region of throttle element 56, filter element 62 and sleeve 51 in each case the conical Auftulpened 60, 60 'of the sleeve 51 and the domed or dome-like filter element 62 and the conical lateral surface of the throttle element 56 correspond to each other in a form-fitting manner such that the filter element 62 between the sleeve 51 and the throttle element 56 is secured securely and reliably.
  • the connection area between sleeve 51, filter element 62 and throttle element 56 is additionally secured by means of a welded joint 69.
  • FIG. 5 shows an alternative embodiment of a setting member 50 in a sectional view.
  • the metal mesh of the domed or dome-like filter element 62 is now attached to a frame part 65 made of injection-molded plastic, wherein the frame part 65 is fixed in the sleeve 51.
  • the deep-drawn metal fabric of the filter element 62 is cast in the plastic frame part 65, so that a one-piece filter element 62 is present, which can be introduced into the sleeve 51.
  • the frame part 65 corresponds to the radially enlarged portion 61 of the sleeve 51 for secure and reliable attachment of the filter element 62.
  • the filter element 62 can be securely fixed in the sleeve 51 by a cohesive or non-positive joining method.
  • FIG. 1 shows an alternative embodiment of a setting member 50 in a sectional view.
  • the sleeve 51 project beyond the frame part 65 of the filter element 62 and also record a lower part of the disc-shaped throttle element 56 and engage over for safe recording.
  • the sleeve 51 is provided with a flange 68 which at least partially overlaps the throttle element 56.
  • a bevel 70 in the sleeve 51 at the bottom End of the frame part 65 of the filter element 62 serves to increase the fatigue strength by a lower stress of the material during deep drawing.
  • 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 ). Weitere Brennstoffeinspritzventile dieser Art sind aus den später veröffentlichten Dokumenten EP 2 884 091 A und WO 2015/086192 A bekannt.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 ). Other fuel injectors of this type are from the later published documents EP 2 884 091 A and WO 2015/086192 A known.

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.All known solutions are characterized by the fact that a pressing region 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 the spring tension remains constant over the service life of the fuel injection valve, ie Slipping of the adjusting sleeve is excluded.

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 zwei Einlegeteile in ihrem Inneren aufnimmt und diese sicher und geschützt umschließt.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 two inserts inside it and encloses them safely and protected.

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 manufacture 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. In vorteilhafter Weise ist das Filterelement aus einem Metallgewebe mittels Tiefziehen in eine Dom- bzw. Kuppelkontur gebracht, das sehr genau in die Hülse des Einstellelements einpassbar ist.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. Advantageously, the filter element is made of a metal fabric by deep drawing in a dome or dome contour, which is very precisely inserted into the sleeve of the adjustment.

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.

Neben den Befestigungsmöglichkeiten des Filter- bzw. des Drosselelements in der Hülse mittels stoff-oder kraftschlüssiger Fügeverfahren ist es besonders einfach und kostengünstig, die Hülse so lang auszuführen, dass mittels einer Bördelung durch Übergreifen des Drosselelements sowohl das Drosselelement als auch das Filterelement in der Hülse gesichert sind.In addition to the attachment options of the filter or the throttle element in the sleeve by means of material or non-positive joining method, it is particularly simple and inexpensive to run the sleeve so long that by means of a flange by overlapping the throttle element, both the throttle element and the filter element in the sleeve are secured.

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, Figur 4 ein aufgeschnittenes Einstellelement gemäß Figur 3 und Figur 5 ein alternatives Ausführungsbeispiel eines Einstellelements in einer Schnittdarstellung.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 adjusting element in an external view, FIG. 4 a cut-open adjustment according to FIG. 3 and FIG. 5 an alternative embodiment of an adjustment in a sectional view.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bevor anhand der Figuren 2 bis 5 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 5 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 is supported Return spring 23 from 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 aus drei 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 63 des Einstellelements 50, der aber nur geringfügig kleiner im Außendurchmesser ist als der Pressbereich 55. 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 adjusting element 50 consists of three individual 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 downstream side portion is the smallest diameter portion 63 of the adjusting member 50, but only slightly smaller in outer diameter than the pressing portion 55.

In der tiefgezogenen Hülse 51 ist ein Filterelement 62 integriert, das dom- bzw. kuppelartiges ausgeführt ist und aus einem Metallgewebe besteht. Das Metallgewebe ist dabei so steif ausgelegt, dass der Domfilter als Filterelement 62 in seiner Konturgebung unveränderlich festgelegt ist. Das Filterelement 62 besitzt an seinem offenen Ende z. B. einen durchmessergrößeren Bundbereich, der mit dem radial vergrößerten Bereich 61 der Hülse 51 korrespondiert. Das Metallgewebe des dom- bzw. kuppelartigen Filterelements 62 ist beispielsweise aus einem Betamesh™ oder Quadratmaschen oder ähnlichen Gewebestrukturen aufgebaut. Die Dom- bzw. Kuppelkontur des Filterelements 62 ist z.B. mittels Tiefziehen erzielbar.In the deep-drawn sleeve 51, a filter element 62 is integrated, which is executed dom- or dome-like and consists of a metal fabric. The metal mesh is designed so stiff that the dome filter is fixed as a filter element 62 in its contour unchangeable. The filter element 62 has at its open end z. B. a larger diameter collar portion corresponding to the radially enlarged portion 61 of the sleeve 51. The metal fabric of the dome-like filter element 62 is constructed, for example, of a Betamesh ™ or square mesh or similar fabric structures. The dome or dome contour of the filter element 62 can be achieved, for example, by deep drawing.

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. Wie oben bereits ausgeführt, besitzt das Filterelement 62 ebenfalls eine Auftulpung 60' im oberen Bundbereich, die an die Auftulpung 60 der Hülse 51 von innen angelegt werden kann.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 or 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. As already stated above, the filter element 62 also has a bulge 60 'in the upper collar region, which can be applied to the bulge 60 of the sleeve 51 from the inside.

Da das Drosselelement 56 zumindest in einem Teilbereich selbst mit einer konischen Mantelfläche versehen ist, kann das Drosselelement 56 formschlüssig im Bereich der Auftulpungen 60, 60' des radial vergrößerten Bereichs 61 der Hülse 51 bzw. des Filterelements 62 aufgenommen werden. Zusätzlich gesichert kann dieser Verbindungsbereich dadurch sein, dass eine Schweißverbindung 69 in Form einer umlaufenden Naht oder mehrerer Heftpunkte im Bereich der Auftulpungen 60, 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 Filterelement 62 sowie das Drosselelement 56 einen zylindrischen Einschubbereich aufweisen. Ein Verpressen ist alternativ zum Verschweißen ebenso denkbar.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 bulges 60, 60 'of the radially enlarged region 61 of the sleeve 51 or of the filter element 62. In addition, this connection region can be secured in that a welded connection 69 in the form of a circumferential seam or several stitching points in the area of the bulges 60, 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 element 56 has, for example, an inflow-side portion 66 which is smaller in diameter than the portion corresponding to the radially enlarged portion 61 of the sleeve 51 and protrudes 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 the filter element 62 and the throttle element 56 also have a cylindrical insertion region. A pressing is also conceivable as an alternative to welding.

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 connection sleeve 40 at the inner pole 13th Finally, by moving the adjusting member 50, the dynamic Abspritzmenge and the spring force of the return spring 23 can be permanently fixed.

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, 63 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, 63, 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. Deutlich wird zudem der Verbindungsbereich von Drosselelement 56, Filterelement 62 und Hülse 51, in dem jeweils die konisch verlaufenden Auftulpungen 60, 60' der Hülse 51 und des dom- bzw. kuppelartigen Filterelements 62 und die konische Mantelfläche des Drosselelements 56 derart formschlüssig miteinander korrespondieren, dass das Filterelement 62 zwischen der Hülse 51 und dem Drosselelement 56 sicher und zuverlässig befestigt ist. Der Verbindungsbereich zwischen Hülse 51, Filterelement 62 und Drosselelement 56 ist mittels einer Schweißverbindung 69 zusätzlich gesichert.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 lying within the sleeve 51 portion of the throttle element 56. It is also clear the connection region of throttle element 56, filter element 62 and sleeve 51, in each case the conical Auftulpungen 60, 60 'of the sleeve 51 and the domed or dome-like filter element 62 and the conical lateral surface of the throttle element 56 correspond to each other in a form-fitting manner such that the filter element 62 between the sleeve 51 and the throttle element 56 is secured securely and reliably. The connection area between sleeve 51, filter element 62 and throttle element 56 is additionally secured by means of a welded joint 69.

Figur 5 zeigt ein alternatives Ausführungsbeispiel eines Einstellelements 50 in einer Schnittdarstellung. In dieser Ausgestaltung ist das Metallgewebe des dom- bzw. kuppelartigen Filterelements 62 nun an einem Rahmenteil 65 aus spritzgegossenem Kunststoff angebracht, wobei das Rahmenteil 65 in der Hülse 51 befestigt ist. Das tiefgezogene Metallgewebe des Filterelements 62 ist dabei in das Kunststoff-Rahmenteil 65 mit eingegossen, so dass ein einteiliges Filterelement 62 vorliegt, das in die Hülse 51 einbringbar ist. Das Rahmenteil 65 korrespondiert mit dem radial vergrößerten Bereich 61 der Hülse 51 zur sicheren und zuverlässigen Befestigung des Filterelements 62. Das Filterelement 62 kann durch ein stoffschlüssiges oder kraftschlüssiges Fügeverfahren sicher in der Hülse 51 befestigt werden. Alternativ kann, wie in Figur 5 gezeigt, die Hülse 51 über das Rahmenteil 65 des Filterelements 62 überstehen und auch noch einen unteren Teil des scheibenförmigen Drosselelements 56 mit aufnehmen und zur sicheren Aufnahme übergreifen. Dazu wird die Hülse 51 mit einer das Drosselelement 56 zumindest teilweise übergreifenden Bördelung 68 versehen. Ein Schrägbereich 70 in der Hülse 51 am unteren Ende des Rahmenteils 65 des Filterelements 62 dient der Steigerung der Dauerfestigkeit durch eine niedrigere Beanspruchung des Materials beim Tiefziehen. FIG. 5 shows an alternative embodiment of a setting member 50 in a sectional view. In this embodiment, the metal mesh of the domed or dome-like filter element 62 is now attached to a frame part 65 made of injection-molded plastic, wherein the frame part 65 is fixed in the sleeve 51. The deep-drawn metal fabric of the filter element 62 is cast in the plastic frame part 65, so that a one-piece filter element 62 is present, which can be introduced into the sleeve 51. The frame part 65 corresponds to the radially enlarged portion 61 of the sleeve 51 for secure and reliable attachment of the filter element 62. The filter element 62 can be securely fixed in the sleeve 51 by a cohesive or non-positive joining method. Alternatively, as in FIG. 5 shown, the sleeve 51 project beyond the frame part 65 of the filter element 62 and also record a lower part of the disc-shaped throttle element 56 and engage over for safe recording. For this purpose, the sleeve 51 is provided with a flange 68 which at least partially overlaps the throttle element 56. A bevel 70 in the sleeve 51 at the bottom End of the frame part 65 of the filter element 62 serves to increase the fatigue strength by a lower stress of the material during deep drawing.

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),
    characterized
    in that the setting element (50) is delimited to the outside by a sleeve (51), and a dome-like or cupola-like filter element (62) made of a woven metal fabric and a throttle element (56) are introduced in the interior of the sleeve (51) as in each case independent inserts.
  2. Fuel infection 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 dome-like or cupola-like filter element (62) is introduced into the setting element (50) in such a manner that it is fastened between the sleeve (51) and the throttle element (56).
  9. Fuel injection valve according to Claim 8,
    characterized
    in that the connecting region between sleeve (51), filter element (62) and throttle element (56) is secured by means of a welded connection (69).
  10. Fuel injection valve according to one of Claims 1 to 8,
    characterized
    in that the woven metal fabric of the dome-like or cupola-like filter element (62) is attached to a frame part (65) made of injection-moulded plastic, wherein the frame part (65) is fastened in the sleeve (51).
  11. Fuel injection valve according, to one of the preceding claims,
    characterized
    in that the woven metal fabric of the dome-like or cupola-like filter element (62) is made up of a Betamesh™ or square meshes or similar woven fabric structures.
EP15191415.7A 2014-12-16 2015-10-26 Fuel injector valve Active EP3034857B1 (en)

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