EP1402172A1 - Fuel-injection valve - Google Patents

Fuel-injection valve

Info

Publication number
EP1402172A1
EP1402172A1 EP02745088A EP02745088A EP1402172A1 EP 1402172 A1 EP1402172 A1 EP 1402172A1 EP 02745088 A EP02745088 A EP 02745088A EP 02745088 A EP02745088 A EP 02745088A EP 1402172 A1 EP1402172 A1 EP 1402172A1
Authority
EP
European Patent Office
Prior art keywords
filter element
armature
fuel injection
injection valve
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02745088A
Other languages
German (de)
French (fr)
Other versions
EP1402172B1 (en
Inventor
Ferdinand Reiter
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1402172A1 publication Critical patent/EP1402172A1/en
Application granted granted Critical
Publication of EP1402172B1 publication Critical patent/EP1402172B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the invention is based on a fuel injection valve according to the type of the main claim.
  • a fuel injection valve is known from DE 44 21 881 AI, the valve needle of which has a filter element mounted in or on it.
  • the function of the filter element is to keep all particles and contaminants upstream of the sealing seat inside the fuel injection valve away from the sealing seat and thus to avoid blockages or leaks at the sealing seat.
  • the filter element is designed in the form of a sieve stocking which at least partially envelops the valve needle.
  • a disadvantage of the fuel injector known from DE 44 21 881 AI is in particular that the manufacture and assembly of a stocking-shaped filter element is complex and therefore cost-intensive. Due to the large surface area of the filter element, due to the strong valve needle movement, it is susceptible to twisting and shifting when the fuel injector is in operation. Advantages of the invention
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that, in addition to a filter element possibly arranged in the fuel supply, a further filter element is provided, which is arranged downstream of the armature and offers a simple possibility of either a second, finer filtering of the flowing through To enable fuel in addition to the filtering by the first filter element or to replace the first filter element with the advantage of the shorter overall length of the fuel injector.
  • the second filter element can be produced in a simple manner from a mesh screen or by making openings in an annular plate.
  • the openings can be produced in a variety of ways, for example by means of laser drilling, etching, eroding or punching.
  • the filter element can either be inserted loosely into the sleeve arranged downstream of the armature , or can be clamped or welded to it in order to fix the filter element.
  • Fig. 1 is a schematic section through an embodiment of a fuel injection valve according to the invention in an overall view
  • FIG. 2 shows a schematic section through the exemplary embodiment of the fuel injector according to the invention shown in FIG. 1 in area II in FIG. 1.
  • a fuel injector 1 shown in FIG. 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is particularly suitable for injecting fuel directly 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 surface 6 arranged on a valve seat body 5 to form a sealing seat.
  • the fuel injection valve 1 is a fuel injection valve 1 that opens inwards and has a spray opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a solenoid 10.
  • the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12 which bears against an inner pole 13 of the magnet coil 10.
  • the inner pole 13 and the outer pole 9 are through a constriction 26 separated from one another and connected to one another by a non-ferromagnetic connecting component 29. •
  • the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
  • a paired adjusting shackle 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15.
  • Flange 21 is connected.
  • a return spring 23 is supported on the flange 21, which in the present design of the fuel injector 1 is preloaded by a sleeve 24.
  • fuel channels 30a to 30c run, which carry the fuel , which is supplied via a central fuel supply 16 and a first filter element 25a is filtered, to the spray opening 7.
  • the fuel injection valve 1 is sealed by a seal 28 against a fuel line (not shown further).
  • a damping element 32 formed as an O-ring and consisting of an elastomer material is arranged in a recess 35. It rests on a shoulder-like widening 36 of a preferably deep-drawn sleeve 31, which is non-positively connected to the valve needle 3 via a weld seam 33.
  • a second filter element 25b is arranged, which is designed in the form of a flat filter 25 and can consist, for example, of screen fabric or as a round plate with many small openings.
  • Flow-through openings 37 are formed in the sleeve 31, which are covered by the second filter element 25b, as a result of which the valve seat is protected from contamination, by coarse particles in the fuel, and malfunctions of the fuel injection valve 1 are avoided.
  • the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the flange 21 connected to the valve needle 3 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, as a result of which the valve closing body 4 is placed on the valve seat surface 6 and. the fuel injector 1 is closed.
  • FIG. 2 shows an enlarged sectional view of an enlarged view of area II in FIG. 1.
  • valve needle 3 A part of the valve needle 3 is shown, the flange 21 welded to it, the 'sleeve 31 and the one in the Recess 35 of the armature 20 inserted second filter element 25b designed according to the invention.
  • flange 21 is first welded to valve needle 3 via weld 22.
  • the damping element 32 is inserted into the recess 35 formed in the downstream end face 34 of the armature 20 and the armature 20 with the damping element 32 inserted is fitted onto the valve needle 3.
  • second filter element 25b is inserted into the stepped sleeve 31, which can preferably be produced by deep drawing and has, preferably, punched through-openings 37 for the fuel line.
  • the sleeve 31 is then pushed together with the second filter element 25b onto the valve needle 3 and also connected to the valve needle 3 via a weld 33.
  • the second filter element 25b is arranged so that it covers the flow openings 37 in the pot-shaped sleeve 31.
  • the shape and fit of the armature 20 ensures that the fuel can flow exclusively through the fuel channels 30a in the armature and the flow openings 37 in the sleeve 31 in the direction of the sealing seat.
  • coarse particles in the fuel can be filtered out by means of the second filter element 25b inserted in the sleeve 31, so that the sealing seat is protected against impurities which can lead to malfunctions of the fuel injection valve 1.
  • the second filter element 25b is preferably designed in the form of a flat filter 25b, which can be made from a screen fabric.
  • the second filter element 25b can also be produced as a round plate from a thin sheet and provided with round or elongated openings through which the fuel flows.
  • the openings can punched, eroded, etched or laser drilled.
  • the openings are preferably smaller than the openings of the upstream first filter element 25a, which increases the effectiveness of fuel filtering.
  • the second filter element 25b can be fixed in the sleeve 31 in various ways in order to prevent slippage and subsequent transfer of dirt particles into the fuel flow.
  • the second filter element 25b is dimensioned so that its diameter corresponds to the inside width of the sleeve 31, it can be inserted into the cup 31 without attachment. If the second filter element 25b is dimensioned somewhat larger, it can be pressed into the sleeve 31 by means of radial pressure.
  • the second filter element 25b is somewhat smaller than the sleeve 31.
  • the second filter element 25b can be fixed to the sleeve 31 by means of laser stitching or spot welding with at least one point.
  • axial bracing of the filter element 25b between the armature 20 and the sleeve 31 can also be considered. This is particularly useful because the armature 20 is in any case braced with the sleeve 31 for the purpose of damping.
  • the invention is not limited to the illustrated embodiments and z. B. also suitable for outward opening fuel injection valves 1 or other anchor shapes, for example flat anchors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel-injection valve (1) for fuel-injection engines. Said valve comprises a valve needle (3), which interacts with a valve seat surface (6) to form a seal seat and an armature (20), which acts upon the valve needle (3), whereby the armature (20) can be axially displaced on the valve needle (3). The armature is also damped in relation to a pot-shaped casing (31) that is located downstream of the armature (20) and connected to the valve needle (3) in a non-positive fit, by means of a damping element (32), which is located in a recess (35) in a downstream front face (34) of the armature (20). The fuel-injection valve also comprises a filter element (25b), which is located downstream of the armature (20) in the pot-shaped casing (31).

Description

Brermstoffeinspritzventil Brermstoffeinspritzventil
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspzritzventil nach der Gattung des Haupt nspruchs .The invention is based on a fuel injection valve according to the type of the main claim.
Beispielsweise ist aus der DE 44 21 881 AI ein Brennstoffeinspritzventil bekannt, dessen Ventilnadel ein in bzw. an ihr montiertes Filterelement aufweist. Das Filterelement hat die Funktion, alle Partikel und Verunreinigungen stromaufwärts des Dichtsitzes im Inneren des Brennstoffeinspritzventils vom Dichtsitz fernzuhalten und damit Verstopfungen bzw. Undichtigkeiten am Dichtsitz zu vermeiden. Das Filterelement ist dabei in Form eines Siebstrumpfes ausgebildet, der die Ventilnadel zumindest teilweise einhüllt .For example, a fuel injection valve is known from DE 44 21 881 AI, the valve needle of which has a filter element mounted in or on it. The function of the filter element is to keep all particles and contaminants upstream of the sealing seat inside the fuel injection valve away from the sealing seat and thus to avoid blockages or leaks at the sealing seat. The filter element is designed in the form of a sieve stocking which at least partially envelops the valve needle.
Nachteilig bei dem aus der DE 44 21 881 AI bekannten Brennstoffeinspritzventil ist insbesondere, daß die Herstellung und die Montage eines Strumpfförmigen Filterelements aufwendig und damit kostenintensiv ist. Durch die große Oberfläche des Filterelements ist dieses bedingt durch die starke Ventilnadelbewegung anfällig gegen Verdrehungen und Verschiebungen beim Betrrieb des Brennstoffeinspritzventils . Vorteile der ErfindungA disadvantage of the fuel injector known from DE 44 21 881 AI is in particular that the manufacture and assembly of a stocking-shaped filter element is complex and therefore cost-intensive. Due to the large surface area of the filter element, due to the strong valve needle movement, it is susceptible to twisting and shifting when the fuel injector is in operation. Advantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß zusätzlich zu einem ggf. in der Brennstoffzufuhr angeordneten Filterelement ein weiteres Filterelement vorgesehen ist, welches abstromseitig des Ankers angeordnet und eine einfache Möglichkeit bietet, entweder eine zweite, feinere Filterung des durchströmenden Brennstoffes zusätzlich zur Filterung durch das erste Filterelement zu ermöglichen oder das erste Filterelement mit dem Vorteil der kürzeren Baulänge des Brennstoffeinspritzventils zu ersetzen.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that, in addition to a filter element possibly arranged in the fuel supply, a further filter element is provided, which is arranged downstream of the armature and offers a simple possibility of either a second, finer filtering of the flowing through To enable fuel in addition to the filtering by the first filter element or to replace the first filter element with the advantage of the shorter overall length of the fuel injector.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the subclaims allow advantageous further developments of the fuel injector specified in the main claim.
Von Vorteil ist dabei insbesondere, daß das zweite Filterelement in einfacher Weise aus einem Siebgeflecht oder mittels Einbringen von Öffnungen in ein ringförmiges Blech herstellbar ist. Die Öffnungen sind dabei in vielfältiger Weise, beispielsweise mittels Laserbohren, Ätzen, Erodieren oder Stanzen, herstellbar.It is particularly advantageous that the second filter element can be produced in a simple manner from a mesh screen or by making openings in an annular plate. The openings can be produced in a variety of ways, for example by means of laser drilling, etching, eroding or punching.
Von Vorteil ist außerdem, daß das Filterelement wahlweise lose in die abstromseitig des Ankers , angeordnete Hülse eingelegt werden kann oder mit dieser verspannt oder verschweißt werden kann, um das Filterelement zu fixieren.It is also advantageous that the filter element can either be inserted loosely into the sleeve arranged downstream of the armature , or can be clamped or welded to it in order to fix the filter element.
Eine vorteilhafte weitere Möglichkeit der Fixierung bietet eine konkave, konvexe oder tellerartige . Form des Filterelements, da in diesem Fall eine Fixierung durch axiale Verspannung zwischen dem Anker und der Hülse, die zu Dämpfungszwecken gegeneinander verspannt sein müssen, ohne weitere Fixierungsmaßnahmen und mit einwandfreier Paßform ermöglicht wird.Another advantageous way of fixing offers a concave, convex or plate-like. Shape of the filter element, since in this case a fixation by axial bracing between the armature and the sleeve, which must be braced against each other for damping purposes, is made possible without further fixation measures and with a perfect fit.
Zeichnung Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläucert:. Es zeigen:drawing An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description: Show it:
Fig. 1 einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstof einspritzventils in einer Gesamtansicht, undFig. 1 is a schematic section through an embodiment of a fuel injection valve according to the invention in an overall view, and
Fig. 2 einen schematischen Schnitt durch das in Fig. 1 dargestellte Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1.FIG. 2 shows a schematic section through the exemplary embodiment of the fuel injector according to the invention shown in FIG. 1 in area II in FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Ein in Fig. 1 dargestelltes 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.A fuel injector 1 shown in FIG. 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines. The fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
Das Brennstoffeinspriczventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht in Wirkverbindung mit einem Ventilschließkörper 4, 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 eine Abspritzöffnung 7 verfüge. 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 surface 6 arranged on a valve seat body 5 to form a sealing seat. In the exemplary embodiment, the fuel injection valve 1 is a fuel injection valve 1 that opens inwards and has a spray opening 7. The nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a solenoid 10. The magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12 which bears against an inner pole 13 of the magnet coil 10. The inner pole 13 and the outer pole 9 are through a constriction 26 separated from one another and connected to one another by a non-ferromagnetic connecting component 29. • The magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17. The plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellschedbe 15. An der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen Flansch 21 kraftschlüssig- mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem. Flansch 21 verbunden ist. Auf dem Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in" der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wixrd . In der Ventilnadelführung 14, im Anker 20 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a bis 30c, die den Brennstoff, welcher über eine zentrale Brennstoffzufuhr 16 zugeführt und ein erstes Filterelement 25a gefiltert wird, zur Abspritzöffnung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Brennstoffleitung abgedichtet.The valve needle 3 is guided in a valve needle guide 14, which is disc-shaped. A paired adjusting shackle 15 is used for stroke adjustment. An armature 20 is located on the other side of the adjusting disk 15. Flange 21 is connected. A return spring 23 is supported on the flange 21, which in the present design of the fuel injector 1 is preloaded by a sleeve 24. In the valve needle guide 14, in the armature 20 and on the valve seat body 5, fuel channels 30a to 30c run, which carry the fuel , which is supplied via a central fuel supply 16 and a first filter element 25a is filtered, to the spray opening 7. The fuel injection valve 1 is sealed by a seal 28 against a fuel line (not shown further).
An einer abstrδmseitigen Seite 34 des Ankers 20 ist in einer Ausnehmung 35 ein als O-Ring ausgebildetes Dämpfungselement 32, welches aus einem Elastomerwerksto f besteht, angeordnet. Es liegt auf einer schulterartigen Verbreiterung 36 einer vorzugsweise tiefgezogenen Hülse 31 auf, welche über eine Schweißnaht 33 kraftschlussig mit der Ventilnadel 3 verbunden ist.On a downstream side 34 of the armature 20, a damping element 32 formed as an O-ring and consisting of an elastomer material is arranged in a recess 35. It rests on a shoulder-like widening 36 of a preferably deep-drawn sleeve 31, which is non-positively connected to the valve needle 3 via a weld seam 33.
In der tiefgezogenen Hülse .31 ist ein zweites Filterelement 25b angeordnet, welches in Form eines Flachfilters 25 ausgebildet ist und beispielsweise aus Siebgewebe oder als Ronde mit vielen kleinen Öffnungen bestehen kann. In der Hülse 31 sind Durchströmöffnungen 37 ausgebildet, die durch das 'zweite Filterelement 25b abgedeckt sind, wodurch der Ventilsitz vor Verschmutzung , durch Grobpartikel im Brennstoff geschützt ist und Fehlfunktionen des Brennstoffeinspritzventils 1 vermieden werden.In the deep-drawn sleeve .31, a second filter element 25b is arranged, which is designed in the form of a flat filter 25 and can consist, for example, of screen fabric or as a round plate with many small openings. Flow-through openings 37 are formed in the sleeve 31, which are covered by the second filter element 25b, as a result of which the valve seat is protected from contamination, by coarse particles in the fuel, and malfunctions of the fuel injection valve 1 are avoided.
Eine detailliertere Darstellung und Beschreibung der erfindungsgemäßen Maßnahmen ist der Beschreibung zu Fig. 2 zu entnehmen .A more detailed illustration and description of the measures according to the invention can be found in the description of FIG. 2.
Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubriehtung so' beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches 'den ."Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzflache 6 ab und der Brennstoff wird durch die Abspritzöffnung 7 abgespritzt.In the rest state of fuel injector 1, armature 20 is acted upon by the restoring spring 23 against its Hubriehtung so 'that the valve closing body 4 is held in sealing engagement with the valve seat. 6 When the magnetic coil 10 is excited, it builds up a magnetic field which '. " Armature 20 moves counter to the spring force of the return spring 23 in the stroke direction, the stroke being predetermined by a working gap 27 in the rest position between the inner pole 12 and the armature 20. The armature 20 takes the flange 21, which is welded to the valve needle 3 The valve closing body 4, which is connected to the valve needle 3, lifts off the valve seat surface 6 and the fuel is sprayed out through the spray 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 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.If the coil current is switched off, the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the flange 21 connected to the valve needle 3 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, as a result of which the valve closing body 4 is placed on the valve seat surface 6 and. the fuel injector 1 is closed.
Fig. 2 zeigt in einer auszugsweisen Schnittdarste llung eine vergrößerte Ansicht des Bereichs II in Fig. 1.FIG. 2 shows an enlarged sectional view of an enlarged view of area II in FIG. 1.
Dargestellt ist ein Teil der Ventilnadel 3, der damit verschweißte Flansch 21, die' Hülse 31 sowie das in die Ausnehmung 35 des Ankers 20 eingelegte erfindungsgemäß ausgestaltete zweite Filterelement 25b.A part of the valve needle 3 is shown, the flange 21 welded to it, the 'sleeve 31 and the one in the Recess 35 of the armature 20 inserted second filter element 25b designed according to the invention.
Bei der Montage des aus Anker 20 und Ventilnadel 3 bestehenden Bauteils wird zunächst der Flansch 21 mit der Ventilnadel 3 über die Schweißnaht 22 verschweißt. Das Dämpfungselement 32 wird in die in der abströmseitigen Stirnseite 34 des Ankers 20 ausgebildete Ausnehmung 35 eingelegt und der Anker 20 mit dem eingelegten Dämpfungselement 32 auf die Ventilnadel 3 aufgesteckt. Anschließend wird das . zweite Filterelement 25b in die gestuft ausgeführte Hülse 31, die vorzugsweise durch Tiefziehen herstellbar ist und zur ■ Brennst offleitung vorzugsweise gestanzte Durchströmöffnungen 37 aufweist, eingelegt. Die Hülse 31 wird dann gemeinsam mit dem zweiten Filterelement 25b auf die Ventilnadel 3 aufgeschoben und ebenfalls mit der Ventilnadel 3 über eine Schweißnaht 33 verbunden.When assembling the component consisting of armature 20 and valve needle 3, flange 21 is first welded to valve needle 3 via weld 22. The damping element 32 is inserted into the recess 35 formed in the downstream end face 34 of the armature 20 and the armature 20 with the damping element 32 inserted is fitted onto the valve needle 3. Then that will. second filter element 25b is inserted into the stepped sleeve 31, which can preferably be produced by deep drawing and has, preferably, punched through-openings 37 for the fuel line. The sleeve 31 is then pushed together with the second filter element 25b onto the valve needle 3 and also connected to the valve needle 3 via a weld 33.
Das zweite Filterelement 25b ist dabei so angeordnet, daß es die Durchströmöffnungen 37 in der topfformigen Hülse 31 abdeckt. Durch die Form und Passung des Ankers 20 wird dabei sichergestellt, daß der Brennstoff ausschließlich durch die Brennstoffkanäle 30a im Anker und die Durchströmöffnungen 37 in der Hülse 31 in Richtung Dichtsitz strömen kann. Dadurch können mittels des in. die Hülse 31 eingelegten zweiten Filterelements 25b zusätzlich zu dem in der zentralen Brennstoffzufuhr 16 angeordneten ersten Filterelement 25a Grobpartikel im Brennstoff ausgefiltert werden, so daß der Dichtsitz vor Verunreinigungen geschützt ist, welche zu Fehlfunktionen des Brennstoffeinspritzventils 1 führen können .The second filter element 25b is arranged so that it covers the flow openings 37 in the pot-shaped sleeve 31. The shape and fit of the armature 20 ensures that the fuel can flow exclusively through the fuel channels 30a in the armature and the flow openings 37 in the sleeve 31 in the direction of the sealing seat. As a result, in addition to the first filter element 25a arranged in the central fuel supply 16, coarse particles in the fuel can be filtered out by means of the second filter element 25b inserted in the sleeve 31, so that the sealing seat is protected against impurities which can lead to malfunctions of the fuel injection valve 1.
Das zweite Filterelement 25b ist dabei vorzugsweise in Form eines Flachfilters 25b ausgebildet, der aus einem Siebgewebe hergestellt sein kann. Das zweite Filterelement 25b kann auch als Ronde aus einem dünnen Blech hergestellt und mit runden oder länglichen Öffnungen, durch welche der Brennstoff strömt, versehen werden. Die Öffnungen können dabei gestanzt, erodiert, geätzt oder lasergebohrt werden. Die Öffnungen sind vorzugsweise kleiner als die Öffnungen des vorgeschalteten ersten Filterelements 25a, wodurch die Effektivität der Brennstoffilterung erhöht wird.The second filter element 25b is preferably designed in the form of a flat filter 25b, which can be made from a screen fabric. The second filter element 25b can also be produced as a round plate from a thin sheet and provided with round or elongated openings through which the fuel flows. The openings can punched, eroded, etched or laser drilled. The openings are preferably smaller than the openings of the upstream first filter element 25a, which increases the effectiveness of fuel filtering.
Das zweite Filterelement 25b kann auf verschiedene Arten in der Hülse 31 fixiert werden, um ein Verrutschen und nachfolgende Übertritte von Schmutzpartikeln in den Brennstoffström zu vermeiden.The second filter element 25b can be fixed in the sleeve 31 in various ways in order to prevent slippage and subsequent transfer of dirt particles into the fuel flow.
Ist das zweite Filterelement 25b so dimensioniert , daß sein Durchmesser der lichten Weite der Hülse 31 entspricht, kann es ohne Befestigung in die topfför ige Hülse 31 eingelegt sein. Ist das zweite Filterelement 25b etwas größer dimensioniert, kann es mittels radialer Pressung in die Hülse 31 eingepreßt sein.If the second filter element 25b is dimensioned so that its diameter corresponds to the inside width of the sleeve 31, it can be inserted into the cup 31 without attachment. If the second filter element 25b is dimensioned somewhat larger, it can be pressed into the sleeve 31 by means of radial pressure.
Eine einfachere Montage ist allerdings möglich, wenn das zweite Filterelement 25b etwas kleiner als die Hülse 31 ist. In diesem Fall kann das zweite Filterelement 25b mittels Laserheftens oder Punktschweißens mit zumindest einem Punkt an der Hülse 31 fixiert werden.A simpler assembly is possible, however, if the second filter element 25b is somewhat smaller than the sleeve 31. In this case, the second filter element 25b can be fixed to the sleeve 31 by means of laser stitching or spot welding with at least one point.
Bei einer von der Form des Flachfilters 25b abweichenden Form, beispielsweise eines tellerförmigen oder gewölbten Filterelements 25b, kann auch eine axiale Verspannung des Filterelements 25b zwischen dem Anker 20 und der Hülse 31 in Erwägung gezogen werden. Dies bietet sich vor allem deshalb an, weil der Anker 20 mit der Hülse 31 zum Zweck der Dämpfung auf jeden Fall verspannt wird.In the case of a shape deviating from the shape of the flat filter 25b, for example a plate-shaped or curved filter element 25b, axial bracing of the filter element 25b between the armature 20 and the sleeve 31 can also be considered. This is particularly useful because the armature 20 is in any case braced with the sleeve 31 for the purpose of damping.
Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. auch für nach außen öffnende Brennstoffeinspritzventile 1 oder andere Ankerformen, beispielsweise Flachanker, geeignet. The invention is not limited to the illustrated embodiments and z. B. also suitable for outward opening fuel injection valves 1 or other anchor shapes, for example flat anchors.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) für1. Fuel injector (1) for
Brennstoffeinsprdtzanlagen von Brennkraftmaschinen mit einer Ventilnadel (3), die mit einer Ventilsitzfläche (6) zu einem Dichtsitz zusammenwirkt, einem an der Ventilnadel (3) angreifenden Anker (20) und einem Filterelement (25b), dadurch gekennzeichnet, daß der Anker (20) an der Ventilnadel (3) axial beweglich ist und über ein Dämpfungselement (32), welches in einer Ausnehmung (35) in einer abströmseitigen Stirnseite (34) des Ankers (20) angeordnet ist, gegenüber einer abstromseitig des Ankers (20) angeordneten, mit der Ventilnadel (3) kraftschlüssig verbundenen topfformigen Hülse (31) gedämpft ist und daß das Filterelement (25b) abstromseitig des Ankers (20) in der topfformigen Hülse (31) angeordnet ist.Fuel injection systems of internal combustion engines with a valve needle (3) which cooperates with a valve seat surface (6) to form a sealing seat, an armature (20) acting on the valve needle (3) and a filter element (25b), characterized in that the armature (20) is axially movable on the valve needle (3) and via a damping element (32), which is arranged in a recess (35) in a downstream end face (34) of the armature (20), with one arranged downstream of the armature (20) the valve needle (3) is non-positively connected pot-shaped sleeve (31) and that the filter element (25b) is arranged downstream of the armature (20) in the pot-shaped sleeve (31).
2. Brennstoffeinspritzventil nach Anspruch 1 , dadurch gekennzeichnet, daß das Filterelement (25b) als Flachfilter ausgebildet ist.2. Fuel injection valve according to claim 1, characterized in that the filter element (25b) is designed as a flat filter.
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Filterelement (25b) aus Siebgewebe hergestellt ist.3. Fuel injection valve according to claim 1 or 2, characterized in that the filter element (25b) is made of screen fabric.
4. Brennstoffeinspritzventil nach Anspruch 1 oder 2,- dadurch gekennzeichnet, daß das Filterelement (25b) als Ronde mit mehreren Öffnungen ausgebildet ist.4. Fuel injection valve according to claim 1 or 2, - characterized in that the filter element (25b) is designed as a round plate with a plurality of openings.
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß die Öffnungen des Filterelements (25b) rund oder länglich sind.5. Fuel injection valve according to claim 4, characterized in that the openings of the filter element (25b) are round or elongated.
6. Brennstoffeinspritzventil nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Öffnungen durch Stanzen, Erodieren, Ätzen oder Laserbohren hergestellt 'sind.6. The fuel injector according to claim 4 or 5, characterized in that the openings by punching, erosion, etching or laser drilling are produced '.
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Filterelement (26) lose in der Hülse eingelegt ist.7. Fuel injection valve according to one of claims 1 to 6, characterized in that the filter element (26) is loosely inserted in the sleeve.
8. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis8. Fuel injection valve according to one of claims 1 to
6, dadurch gekennzeichnet, daß das Filterelement (26) in der Hülse (31) radial verpreßt ist .6, characterized in that the filter element (26) in the sleeve (31) is radially pressed.
9. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Filterelement (26) in der Hülse (3L) mittels Schweißens fixiert ist.9. Fuel injection valve according to one of claims 1 to 6, characterized in that the filter element (26) in the sleeve (3L) is fixed by means of welding.
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis10. Fuel injection valve according to one of claims 1 to
9, dadurch gekennzeichnet, daß das Filterelement (26) so geformt ist, daß es axial zwischen dem Anker (20) und der Hülse (31) verspannbar ist.9, characterized in that the filter element (26) is shaped so that it can be clamped axially between the armature (20) and the sleeve (31).
11. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Hülse ( 31 ) Durchströmöffnungen ( 37 ) aufweist, die durch das Filterelement . (26) abgedeckt sind.11. Fuel injection valve according to one of claims 1 to 10, characterized in that the sleeve (31) has flow openings (37) through the filter element . (26) are covered.
12 . Brennstof feinspritzventil nach einem der Ansprüche 1 bis12th Fuel injection valve according to one of claims 1 to
11 , dadurch gekennzeichnet, daß die Öffnungen des in der topfformigen Hülse (31) angeordneten Filterelements (25b) kleiner sind als die11, characterized in that the openings of the filter element (25b) arranged in the pot-shaped sleeve (31) are smaller than that
Öffnungen eines in einer zentralen Brennstoffzufuhr (16) angeordneten Filterelements (25a) . Openings of a filter element (25a) arranged in a central fuel supply (16).
EP02745088A 2001-06-22 2002-05-25 Fuel-injection valve Expired - Lifetime EP1402172B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130205A DE10130205A1 (en) 2001-06-22 2001-06-22 Fuel injector
DE10130205 2001-06-22
PCT/DE2002/001927 WO2003001051A1 (en) 2001-06-22 2002-05-25 Fuel-injection valve

Publications (2)

Publication Number Publication Date
EP1402172A1 true EP1402172A1 (en) 2004-03-31
EP1402172B1 EP1402172B1 (en) 2004-11-17

Family

ID=7689115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02745088A Expired - Lifetime EP1402172B1 (en) 2001-06-22 2002-05-25 Fuel-injection valve

Country Status (6)

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US (1) US6994281B2 (en)
EP (1) EP1402172B1 (en)
JP (1) JP4008875B2 (en)
KR (1) KR20030036712A (en)
DE (2) DE10130205A1 (en)
WO (1) WO2003001051A1 (en)

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Publication number Publication date
WO2003001051A1 (en) 2003-01-03
JP2004521252A (en) 2004-07-15
DE50201582D1 (en) 2004-12-23
KR20030036712A (en) 2003-05-09
US20040099753A1 (en) 2004-05-27
DE10130205A1 (en) 2003-01-02
EP1402172B1 (en) 2004-11-17
JP4008875B2 (en) 2007-11-14
US6994281B2 (en) 2006-02-07

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