EP1377747A1 - Fuel injection valve with a filter bush - Google Patents

Fuel injection valve with a filter bush

Info

Publication number
EP1377747A1
EP1377747A1 EP02721980A EP02721980A EP1377747A1 EP 1377747 A1 EP1377747 A1 EP 1377747A1 EP 02721980 A EP02721980 A EP 02721980A EP 02721980 A EP02721980 A EP 02721980A EP 1377747 A1 EP1377747 A1 EP 1377747A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
filter
fuel
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
EP02721980A
Other languages
German (de)
French (fr)
Other versions
EP1377747B1 (en
Inventor
Dieter Maier
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 EP1377747A1 publication Critical patent/EP1377747A1/en
Application granted granted Critical
Publication of EP1377747B1 publication Critical patent/EP1377747B1/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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injector is already known in which a fuel filter is made in one piece with a retaining collar.
  • the retaining collar extends radially beyond the fuel inlet connector and has a nose outside the fuel inlet connector.
  • the circumferential nose of the retaining collar forms, together with a groove on the outer circumference of the fuel inlet connection, a snap-in connection, through which the fuel filter is fastened in a defined manner.
  • a filter for a fuel injection valve with a central fuel supply which is in a form-fitting connection with an adjusting sleeve for a return spring which keeps the fuel injection valve closed in the idle state.
  • the filter consists of a plastic frame over which a mesh is placed.
  • the filter is connected to the adjustment sleeve, which is preferably made of metal, by means of a snap lock.
  • a disadvantage of the fuel injection valves known from the above-mentioned documents is, in particular, the high production expenditure which is incurred for fixing the filter either on the adjusting sleeve or on the fuel inlet connection. Furthermore, the filter and the adjustment sleeve are made of different materials, with chip removal and abrasion occurring mainly on the plastic of the filter, which can lead to malfunctions of the fuel injector due to the deposition of the particles.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the sleeve for adjusting the dynamic flow is integrally formed with the filter element and thus on the one hand the position of the sleeve is easily adjustable by the outstanding filter element and on the other hand a quick and inexpensive manufacture and Assembly is made possible.
  • the combined filter sleeve is manufactured inexpensively by deep drawing, so that on a plastic frame with a filter grid attached to it can be dispensed with.
  • Flow openings are preferably provided, which can be introduced quickly and precisely into the filter sleeve in large numbers by laser drilling.
  • Another advantage is that the filter sleeve can also be removed if necessary.
  • Fig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention
  • FIG. 2 shows an excerpted schematic section through the exemplary embodiment shown in FIG. 1 in area II in FIG. 1.
  • a fuel injector 1 is e.g. B. in the form of an injection valve for fuel injection systems of spark-ignited, mixture-compressing internal combustion engines executed.
  • the fuel injection valve 1 shown is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the invention is equally suitable for fuel injection valves 1 for injecting fuel into an intake manifold of the internal combustion engine.
  • the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is guided.
  • 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.
  • fuel injector 1 is a fuel injector 1 that opens inward 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 separated from one another by a gap 26 and are supported on a 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 disk 15 is used for stroke adjustment.
  • An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected via a flange 21 to the valve needle 3, which is connected to the flange 21 by a weld seam 22.
  • a restoring spring 23 is supported on the flange 21, which in the present design of the fuel injector 1 is supported by a sleeve 24 Bias is brought.
  • the sleeve 24, which is designed as an adjusting sleeve, is designed in one piece with a filter element 25 according to the invention.
  • the component formed in this way is referred to below as filter sleeve 34.
  • the filter effect arises through flow openings 35, which are introduced into an inflow end 36 of the filter sleeve 34.
  • An outflow end 37 of the filter sleeve 34 is shaped in such a way that it can be used to adjust the spring preload of the return spring 23 and thus to adjust the static flow rate through the fuel injector 1.
  • a detailed description of the filter sleeve 34 can be found in the description of FIG. 2.
  • Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and on the valve seat body 5, which channels the fuel, which is supplied via a central fuel supply 16, to the spray opening 7.
  • the fuel injector 1 is sealed by a seal 28 against a receiving bore, not shown, for. B. sealed in a fuel rail.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 against its stroke direction in such a way that the valve closing body 4 is held in sealing contact with the valve seat 6.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, the stroke being predetermined by a working gap 27 which is in the rest position between the inner pole 13 and the armature 20.
  • the armature 20 also carries the flange 21, which is welded to the valve needle 3, in the lifting direction.
  • the valve closing body 4, which is operatively connected to the valve needle 3, lifts off the valve seat surface and fuel is sprayed off via the spray opening 7.
  • the armature 20 falls after the magnetic field has been sufficiently reduced by the pressure of the Return spring 23 from the inner pole 13, whereby the flange 21 which is operatively 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-closure member 4 is seated on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • FIG. 2 shows an excerpted sectional view of the detail of the fuel injector 1 designed according to the invention, designated II in FIG. 1.
  • the filter sleeve 34 is constructed in such a way that the throughflow openings 35 are formed at the inlet-side end 36, while the outflow-side end 37 is sleeve-shaped, so that the prestressing of the return spring 23 by inserting the filter sleeve 34 into the fuel injection valve 1 is changeable.
  • the filter sleeve 34 is preferably formed from metal in order to ensure a permanent clamping effect during the entire service life of the fuel injector 1. It is manufactured by deep drawing, a manufacturing process that is simple and inexpensive.
  • small-caliber flow openings 35 are introduced in large numbers into the inlet end 36 of the filter sleeve 34. This is preferably done by laser drilling, since extremely fine, small-volume bores can be produced here.
  • the diameter of the flow openings 35 is preferably 0.04 to 0.05 mm, as a result of which dirt particles in the fuel can be filtered out to a satisfactory degree.
  • the number of flow openings 35 depends on the available area of the filter area 25.
  • the filter sleeve 34 can be extended or the area of an inlet-side cover plate 38 can be used Filter sleeve 34, the number of flow openings 35 can be increased.
  • the interior of the fuel injection valve 1 can be protected twice against contamination which can lead to malfunctions during the operation of the fuel injection valve 1.
  • the dynamic flow is adjusted by moving the filter sleeve 34 with the filter 25 already installed, so that contaminations of the adjusting tool cannot get into the valve interior.
  • machining and abrasion are eliminated when filter 25 is pressed in at the end of the production line, which also prevents malfunctions due to deposition of the abrasion or larger particles.
  • the setting of the dynamic flow through the fuel injection valve 1 can also be carried out more easily and quickly by the combined filter sleeve 34.
  • the filter sleeve 34 projects so far upstream into the central fuel supply 16 that it can be moved more easily or even removed again in an emergency.
  • the filter sleeve 34 is arranged considerably closer to the valve group after the flow has been set, so that the surface between the filter sleeve 34 and the valve group also becomes smaller and the risk of contamination thus decreases.
  • the invention is not limited to the illustrated embodiments and suitable for any construction of fuel injection valves 1, for. B. for fuel injectors 1 for manifold injection or for fuel injectors 1 with connection to a common rail system.

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

A fuel injection valve (1) for fuel injection units on internal combustion engines, comprises a magnet coil (10), a valve needle (3), co-operating with the magnet coil (10) and acted upon in a return direction by a return spring (23), for operating a valve closing body (4), which forms a sealing seat together with a valve seat surface (6) and a bush (24) which serves to pre-tension the return spring (23). The bush (24) is embodied in one piece with a filter element (25) to give a one-piece deep-drawn filter bush (34), comprising through openings (35) for filtering fuel flowing through the fuel injection valve (1).

Description

BRΞNNSTOPFEINSPRITZVENTIL MIT EINER FILTERHÜLSE FUEL INJECTOR VALVE WITH A FILTER SLEEVE
BrennstoffeinspritzventilFuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs .The invention relates to a fuel injector according to the preamble of the main claim.
Bei bereits bekannten Brennstoffeinspritzventilen sind Brennstoffilter in einen Brennsto feinlaßstutzen eingepreßt und damit darin befestigt. Diese Befestigungsart bringt die Gefahr der Bildung von Abrieb und Spänen mit sich, die zu funktionalen Störungen des Brennsto feinspritzventils führen können. Außerdem werden Haltekragen für obere Dichtringe als Einzelbauteile ausgeführt.In already known fuel injection valves, fuel filters are pressed into a fuel nozzle and thus fastened therein. This type of fastening entails the risk of the formation of abrasion and chips, which can lead to functional faults in the fuel injection valve. In addition, retaining collars for upper sealing rings are designed as individual components.
Aus der DE 43 25 842 AI ist bereits ein Brennstoffeinspritzventil bekannt, bei dem ein Brennstoffilter einteilig mit einem Haltekragen ausgeführt ist. Der Haltekragen erstreckt sich radial über den Brennstoffeinlaßstutzen hinaus und besitzt außerhalb des Brennstoffeinlaßstutzens eine Nase. Die umlaufende Nase des Haltekragens bildet zusammen mit einer Nut am äußeren Umfang des Brennstoffeinlaßstutzens eine Rastverbindung, durch die der Brennstoffilter definiert befestigt ist. Zwischen dem Grundkörper des Brennstoffiltere und der inneren Wandung des Brennstoffeinlaßstutzens liegt nur eine Spielpassung vor, so daß jegliche Spanbildung im Inneren des Brennstoffeinspritzventils vermieden wird.From DE 43 25 842 AI a fuel injector is already known in which a fuel filter is made in one piece with a retaining collar. The retaining collar extends radially beyond the fuel inlet connector and has a nose outside the fuel inlet connector. The circumferential nose of the retaining collar forms, together with a groove on the outer circumference of the fuel inlet connection, a snap-in connection, through which the fuel filter is fastened in a defined manner. There is only a clearance fit between the base body of the fuel filter and the inner wall of the fuel inlet connector, so that any chip formation inside the fuel injector is avoided.
Weiterhin ist aus der EP 0 697 064 Bl ein Filter für ein Brennstoffeinspritzventil mit zentraler Brennstoffzufuhr bekannt, welches in formschlüssiger Verbindung mit einer Einstellhülse für eine Rückstellfeder, die das Brennstoffeinspritzventil im Ruhezustand geschlossen hält, steht. Der Filter besteht dabei aus einem Kunststoffgestell, über welches ein Gittergeflecht gelegt ist. Der Filter ist mit Hilfe eines Rast-Verschlusses mit der vorzugsweise aus Metall bestehenden Einstellhülse verbunden. Dadurch kann der statische Durchfluß durch das Brennstoffeinspritzventil auch nach Einsetzen des Filters kalibriert werden.Furthermore, from EP 0 697 064 B1 a filter for a fuel injection valve with a central fuel supply is known, which is in a form-fitting connection with an adjusting sleeve for a return spring which keeps the fuel injection valve closed in the idle state. The filter consists of a plastic frame over which a mesh is placed. The filter is connected to the adjustment sleeve, which is preferably made of metal, by means of a snap lock. As a result, the static flow through the fuel injector can be calibrated even after the filter has been inserted.
Nachteilig an den aus den oben genannten Druckschriften bekannten Brennsto feinspritzventilen ist insbesondere der hoher Fertigungsaufwand, der zur Fixierung des Filters entweder an der Einstellhülse oder an dem Brennstoffeinlaßstutzen anfällt. Ferner bestehen Filter und Einstellhülse aus unterschiedlichen Materialien, wobei an den Kontaktflächen vorwiegend am Kunststoff des Filters Abspanungen und Abrieb auftreten, was zu Fehlfunktionen des Brennstoffeinspritzventils durch die Ablagerung der Partikel führen kann .A disadvantage of the fuel injection valves known from the above-mentioned documents is, in particular, the high production expenditure which is incurred for fixing the filter either on the adjusting sleeve or on the fuel inlet connection. Furthermore, the filter and the adjustment sleeve are made of different materials, with chip removal and abrasion occurring mainly on the plastic of the filter, which can lead to malfunctions of the fuel injector due to the deposition of the particles.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Hülse zur Einstellung des dynamischen Durchflusses einstückig mit dem Filterelement ausgebildet ist und somit einerseits die Position der Hülse durch das herausragende Filterelement leicht einstellbar ist und andererseits eine schnelle und kostengünstige Herstellung und Montage ermöglicht wird.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that the sleeve for adjusting the dynamic flow is integrally formed with the filter element and thus on the one hand the position of the sleeve is easily adjustable by the outstanding filter element and on the other hand a quick and inexpensive manufacture and Assembly is made possible.
Die kombinierte Filterhülse wird dabei durch Tiefziehen kostengünstig hergestellt, so daß auf ein Kunststoffgestell mit einem daran angebrachten Filtergitter verzichtet werden kann.The combined filter sleeve is manufactured inexpensively by deep drawing, so that on a plastic frame with a filter grid attached to it can be dispensed with.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.Advantageous further developments and improvements of the fuel injector specified in the main claim are possible through the measures listed in the subclaims.
Vorzugsweise sind Durchströmöffnungen vorgesehen, die durch Laserbohren in großer Anzahl schnell und exakt in die Filterhülse einbringbar sind.Flow openings are preferably provided, which can be introduced quickly and precisely into the filter sleeve in large numbers by laser drilling.
Von Vorteil ist insbesondere auch, daß die Einstellung des Durchflusses bei bereits eingesetztem Filter erfolgen kann, da Verschmutzungen des Ventilinnenraums durch die Einstellwerkzeuge vermieden werden können.It is also particularly advantageous that the flow can be set with the filter already in place, since contamination of the valve interior can be avoided by the setting tools.
Weiterhin ist von Vorteil, daß die Filterhülse, falls die Notwendigkeit besteht, auch wieder entfernt werden kann.Another advantage is that the filter sleeve can also be removed if necessary.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: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 erfindungsgemäß ausgestalteten Brennstoffeinspritzventils, undFig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention, and
Fig. 2 einen auszugsweisen schematischen Schnitt durch das in Fig. 1 dargestellte Ausführungsbeispiel im Bereich II in Fig. 1.FIG. 2 shows an excerpted schematic section through the exemplary embodiment shown in FIG. 1 in area II in FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Ein Brennstoffeinspritzventil 1 ist z. B. in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von fremdgezündeten, gemischverdichtenden Brennkraftmaschinen ausgeführt. Das dargestellte Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine. Die Erfindung ist aber auch bei Brennstoffeinspritzventilen 1 zum Einspritzen von Brennstoff in ein Saugrohr der Brennkraftmaschine in gleicher Weise geeignet .A fuel injector 1 is e.g. B. in the form of an injection valve for fuel injection systems of spark-ignited, mixture-compressing internal combustion engines executed. The fuel injection valve 1 shown is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine. However, the invention is equally suitable for fuel injection valves 1 for injecting fuel into an intake manifold of the internal combustion engine.
Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 geführt ist. Die Ventilnadel 3 steht mit einem Ventilschiießkörper 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 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 einen Spalt 26 voneinander getrennt und stützen sich auf einem Verbindungsbauteil 29 ab. 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 injector 1 consists of a nozzle body 2, in which a valve needle 3 is guided. 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, fuel injector 1 is a fuel injector 1 that opens inward 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 separated from one another by a gap 26 and are supported on a 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 Einstellscheibe 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, die durch eine Schweißnaht 22 mit dem Flansch 21 verbunden ist.The valve needle 3 is guided in a valve needle guide 14, which is disc-shaped. A paired adjusting disk 15 is used for stroke adjustment. An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected via a flange 21 to the valve needle 3, which is connected to the flange 21 by a weld seam 22.
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 wird. Die als Einstellhülse ausgebildete Hülse 24 ist erfindungsgemäß einstückig mit einem Filterelement 25 ausgebildet. Das so gebildete Bauteil wird im folgenden als Filterhülse 34 bezeichnet. Die Filterwirkung entsteht dabei durch Durchströmöffnungen 35, welche in einem zuströmseitigen Ende 36 der Filterhülse 34 eingebracht sind. Ein abströmseitiges Ende 37 der Filterhülse 34 ist so ausgeformt, daß es zur Einstellung der Federvorspannung der Rückstellfeder 23 und damit zur Einstellung der statischen Durchflußmenge durch das Brennstoffeinspritzventil 1 herangezogen werden kann. Eine detaillierte Beschreibung der Filterhülse 34 ist der Beschreibung zu Fig. 2 zu entnehmen.A restoring spring 23 is supported on the flange 21, which in the present design of the fuel injector 1 is supported by a sleeve 24 Bias is brought. The sleeve 24, which is designed as an adjusting sleeve, is designed in one piece with a filter element 25 according to the invention. The component formed in this way is referred to below as filter sleeve 34. The filter effect arises through flow openings 35, which are introduced into an inflow end 36 of the filter sleeve 34. An outflow end 37 of the filter sleeve 34 is shaped in such a way that it can be used to adjust the spring preload of the return spring 23 and thus to adjust the static flow rate through the fuel injector 1. A detailed description of the filter sleeve 34 can be found in the description of FIG. 2.
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 wird, zur Abspritzöffnung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Aufnahmebohrung, z. B. in einem Fuel Rail, abgedichtet.Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and on the valve seat body 5, which channels the fuel, which is supplied via a central fuel supply 16, to the spray opening 7. The fuel injector 1 is sealed by a seal 28 against a receiving bore, not shown, for. B. sealed in a fuel rail.
Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubrichtung 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 13 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 Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche ab und Brennstoff wird über 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 against its stroke direction in such a way that the valve closing body 4 is held in sealing contact with the valve seat 6. When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, the stroke being predetermined by a working gap 27 which is in the rest position between the inner pole 13 and the armature 20. The armature 20 also carries the flange 21, which is welded to the valve needle 3, in the lifting direction. The valve closing body 4, which is operatively connected to the valve needle 3, lifts off the valve seat surface and fuel is sprayed off via 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 Wirkverbindung 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 falls after the magnetic field has been sufficiently reduced by the pressure of the Return spring 23 from the inner pole 13, whereby the flange 21 which is operatively 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-closure member 4 is seated on the valve seat surface 6 and the fuel injection valve 1 is closed.
Fig. 2 zeigt in einer auszugsweisen Schnittdarstellung das in Fig. 1 mit II bezeichnete Detail des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1.FIG. 2 shows an excerpted sectional view of the detail of the fuel injector 1 designed according to the invention, designated II in FIG. 1.
Wie bereits weiter oben erwähnt, ist die Filterhülse 34 so aufgebaut, daß am zulaufseitigen Ende 36 die Durchstrδmöffnungen 35 ausgebildet sind, während das abströmseitige Ende 37 hülsenförmig ausgebildet ist, so daß die Vorspannung der Rückstellfeder 23 durch das Einschieben der Filterhülse 34 in das Brennstoffeinspritzventil 1 veränderbar ist.As already mentioned above, the filter sleeve 34 is constructed in such a way that the throughflow openings 35 are formed at the inlet-side end 36, while the outflow-side end 37 is sleeve-shaped, so that the prestressing of the return spring 23 by inserting the filter sleeve 34 into the fuel injection valve 1 is changeable.
Die Filterhülse 34 ist dabei vorzugsweise aus Metall ausgeformt, um eine dauerhafte Klemmwirkung während der gesamten Lebensdauer des Brennstoffeinspritzventils 1 zu gewährleisten. Die Herstellung erfolgt durch Tiefziehen, ein Herstellungsverfahren, das einfach und kostengünstig ist.The filter sleeve 34 is preferably formed from metal in order to ensure a permanent clamping effect during the entire service life of the fuel injector 1. It is manufactured by deep drawing, a manufacturing process that is simple and inexpensive.
Zur Vermeidung größeren Herstellungsaufwands für den Filterbereich 25 der Filterhülse 34 werden kleinkalibrige Durchströmöffnungen 35 in großer Anzahl in das zulaufseitige Ende 36 der Filterhülse 34 eingebracht. Dies geschieht vorzugsweise durch Laserbohren, da hierbei äußerst feine, kleinvolumige Bohrungen herstellbar sind. Der Durchmesser der Durchströmöffnungen 35 beträgt vorzugsweise 0,04 bis 0,05 mm, wodurch Schmutzpartikel im Brennstoff in befriedigendem Maße ausgefiltert werden können. Die Anzahl der Durchströmöffnungen 35 richtet sich dabei nach der verfügbaren Fläche des Filterbereiches 25. Beispielsweise kann durch eine Verlängerung der Filterhülse 34 oder durch Ausnutzung der Fläche einer zulaufseitigen Deckplatte 38 der Filterhülse 34 die Anzahl der Durchströmöffnungen 35 erhöht werden.In order to avoid greater manufacturing expenditure for the filter area 25 of the filter sleeve 34, small-caliber flow openings 35 are introduced in large numbers into the inlet end 36 of the filter sleeve 34. This is preferably done by laser drilling, since extremely fine, small-volume bores can be produced here. The diameter of the flow openings 35 is preferably 0.04 to 0.05 mm, as a result of which dirt particles in the fuel can be filtered out to a satisfactory degree. The number of flow openings 35 depends on the available area of the filter area 25. For example, the filter sleeve 34 can be extended or the area of an inlet-side cover plate 38 can be used Filter sleeve 34, the number of flow openings 35 can be increased.
Das Innere des Brennstoffeinspritzventils 1 kann auf diese Weise gleich zweifach gegen Verunreinigungen, die zu Fehlfunktionen beim Betrieb des Brennstoffeinspritzventils 1 führen können, geschützt werden. Einerseits erfolgt die Einstellung des dynamischen Durchflusses durch Verschieben der Filterhülse 34 bei bereits montiertem Filter 25, so daß Verschmutzungen des Einstellwerkzeugs nicht in den Ventilinnenraum gelangen können. Andererseits entfallen Abspanungen und Abrieb beim Einpressen des Filters 25 am Ende der Produktionslinie, wodurch ebenfalls Fehlfunktionen durch Ablagerung des Abriebs oder größerer Partikel vermieden werden.In this way, the interior of the fuel injection valve 1 can be protected twice against contamination which can lead to malfunctions during the operation of the fuel injection valve 1. On the one hand, the dynamic flow is adjusted by moving the filter sleeve 34 with the filter 25 already installed, so that contaminations of the adjusting tool cannot get into the valve interior. On the other hand, machining and abrasion are eliminated when filter 25 is pressed in at the end of the production line, which also prevents malfunctions due to deposition of the abrasion or larger particles.
Auch die Einstellung des dynamischen Durchflusses durch das Brennstoffeinspritzventil 1 kann durch die kombinierte Filterhülse 34 einfacher und schneller erfolgen. Zum einen ragt die Filterhülse 34 bedingt durch ihre größere Baulänge so weit stromaufwärtig in die zentrale Brennstoffzufuhr 16, daß sie einfacher verschoben oder im Notfall sogar wieder entfernt werden kann. Zum anderen ist die Filterhülse 34 nach Einstellung des Durchflusses erheblich näher an der Ventilgruppe angeordnet, so daß auch die Oberfläche zwischen der Filterhülse 34 und der Ventilgruppe kleiner wird und somit die Verschmutzungsgefahr abnimmt.The setting of the dynamic flow through the fuel injection valve 1 can also be carried out more easily and quickly by the combined filter sleeve 34. On the one hand, due to its greater overall length, the filter sleeve 34 projects so far upstream into the central fuel supply 16 that it can be moved more easily or even removed again in an emergency. On the other hand, the filter sleeve 34 is arranged considerably closer to the valve group after the flow has been set, so that the surface between the filter sleeve 34 and the valve group also becomes smaller and the risk of contamination thus decreases.
Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1 geeignet, z. B. für Brennstoffeinspritzventile 1 für Saugrohreinspritzung oder für Brennstoffeinspritzventile 1 mit Anbindung an ein Common-Rail-System. The invention is not limited to the illustrated embodiments and suitable for any construction of fuel injection valves 1, for. B. for fuel injectors 1 for manifold injection or for fuel injectors 1 with connection to a common rail system.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) für1. Fuel injector (1) for
Brennstoffeinspritzanlagen von Brennkraftmaschinen mit einer Magnetspule (10) , einer mit der Magnetspule (10) in Wirkverbindung stehenden und in einer Schließrichtung von einer Rückstellfeder (23) beaufschlagten Ventilnadel (3) zur Betätigung eines Ventilschließkörpers (4) , der zusammen mit einer Ventilsitzfläche (6) einen Dichtsitz bildet, und einer Hülse' (24) , die die Rückstellfeder (23) mit einer Vorspannung beaufschlagt, dadurch gekennzeichnet, daß die Hülse (24) einstückig mit einem Filterelement (25) zu einer einteiligen, tiefgezogenen Filterhülse (34) ausgebildet ist, welche Durchströmöffnungen (35) zur Filterung des das Brennstoffeinspritzventil (1) durchströmenden Brennstoffs aufweist.Fuel injection systems of internal combustion engines with a magnet coil (10), a valve needle (3) which is operatively connected to the magnet coil (10) and acted upon in a closing direction by a return spring (23) for actuating a valve closing body (4) which, together with a valve seat surface (6 ) forms a sealing seat, and a sleeve '(24) which biases the return spring (23), characterized in that the sleeve (24) is formed in one piece with a filter element (25) to form a one-piece, deep-drawn filter sleeve (34) which has flow openings (35) for filtering the fuel flowing through the fuel injection valve (1).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Durchstrδmöffnungen (35) in einem zulaufseitigen Ende (36) der Filterhülse (34) eingebracht sind.2. Fuel injection valve according to claim 1, characterized in that the flow openings (35) in an inlet end (36) of the filter sleeve (34) are introduced.
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Durchströmδffnungen (35) mittels Laserbohrens in die Filterhülse (34) eingebracht sind. 3. Fuel injection valve according to claim 1 or 2, characterized in that the through-flow openings (35) are introduced into the filter sleeve (34) by means of laser drilling.
4. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Durchmesser der Durchströmöffnungen (35) 0,04 mm bis 0,05 mm betragen.4. Fuel injection valve according to one of claims 1 to 3, characterized in that the diameter of the flow openings (35) are 0.04 mm to 0.05 mm.
5. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein abströmseitiges Ende (37) der Filterhülse (34) so ausgebildet ist, daß die Rückstellfeder (23) durch Verschieben der Filterhülse (34) mit einer variablem Vorspannung beaufschlagbar ist. 5. Fuel injection valve according to one of claims 1 to 4, characterized in that an outflow end (37) of the filter sleeve (34) is formed such that the return spring (23) can be acted upon by moving the filter sleeve (34) with a variable bias.
EP02721980A 2001-02-28 2002-02-27 Fuel injection valve with a filter bush Expired - Lifetime EP1377747B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10109410A DE10109410A1 (en) 2001-02-28 2001-02-28 Fuel injector
DE10109410 2001-02-28
PCT/DE2002/000691 WO2002068816A1 (en) 2001-02-28 2002-02-27 Fuel injection valve with a filter bush

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EP1377747A1 true EP1377747A1 (en) 2004-01-07
EP1377747B1 EP1377747B1 (en) 2005-04-20

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US (1) US7070127B2 (en)
EP (1) EP1377747B1 (en)
JP (1) JP2004518864A (en)
CN (1) CN1455847A (en)
CZ (1) CZ20022963A3 (en)
DE (2) DE10109410A1 (en)
WO (1) WO2002068816A1 (en)

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DE50202846D1 (en) 2005-05-25
JP2004518864A (en) 2004-06-24
CN1455847A (en) 2003-11-12
US20030155445A1 (en) 2003-08-21
US7070127B2 (en) 2006-07-04
DE10109410A1 (en) 2002-09-05
WO2002068816A1 (en) 2002-09-06
EP1377747B1 (en) 2005-04-20
CZ20022963A3 (en) 2004-05-12

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