EP1402173A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1402173A1
EP1402173A1 EP02748592A EP02748592A EP1402173A1 EP 1402173 A1 EP1402173 A1 EP 1402173A1 EP 02748592 A EP02748592 A EP 02748592A EP 02748592 A EP02748592 A EP 02748592A EP 1402173 A1 EP1402173 A1 EP 1402173A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
membrane
armature
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.)
Granted
Application number
EP02748592A
Other languages
German (de)
French (fr)
Other versions
EP1402173B1 (en
Inventor
Günter DANTES
Detlef Nowak
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 EP1402173A1 publication Critical patent/EP1402173A1/en
Application granted granted Critical
Publication of EP1402173B1 publication Critical patent/EP1402173B1/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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • 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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/047—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 the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86718—Dividing into parallel flow paths with recombining
    • Y10T137/86759—Reciprocating

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • an electromagnetically actuated fuel injection valve in which an armature interacts with an electrically excitable solenoid for electromagnetic actuation and the stroke of the armature is transmitted to a valve closing body via a valve needle.
  • the valve closing body interacts with a valve seat surface to form a sealing seat.
  • Several fuel channels are provided in the anchor.
  • the armature is reset using a return spring.
  • a disadvantage of the fuel injector known from DE 196 26 576 AI is in particular that the dynamic fuel quantity qyn flowing through the fuel injector cannot be dosed precisely enough when the valve closing body is lifted from the valve. Specifically, the ratio of maximum to minimum fuel quantity till sprayter tillter fuel quantity q max / q m i n is relatively small.
  • the characteristic of the fuel injector which shows the course of the represents dynamic flow rate q d yn depending on the stroke of the valve needle, is relatively flat, so that strong fluctuations occur in the dynamic flow.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the fuel flow through the fuel injector is prevented by means of a membrane arranged on an inlet-side end face of the inner pole until the membrane is lifted by elastic deformation and at least one opening in the Membrane is released.
  • the resulting fuel flow follows an approximately step-shaped lifting throttle function.
  • the membrane is operatively connected to the armature by a simple construction via a plunger.
  • the individual parts are simple and inexpensive to manufacture.
  • the plunger and the membrane as well as the membrane and the inner pole are advantageously connected to one another by means of weld seams.
  • the plunger is inserted into a blind hole in the armature and is thus easily secured against slipping.
  • the plunger passes through the return spring, which acts on the armature, and the sleeve, which biases the return spring, whereby the arrangement is integrated in the fuel injector in a compact and space-saving manner.
  • the at least one opening is dimensioned so that it does not act as a throttle and thus no stroke throttling occurs.
  • Fig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention
  • Fig. 2 is a schematic representation of the dynamic flow qa . yn n as a function of the stroke of the valve needle of the fuel injector according to the invention shown in FIG. 1.
  • Fig. 1 shows an exemplary sectional view of an embodiment of an inventive
  • Fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 consists of a tube-shaped 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 an inward opening one Fuel injection valve 1, which has a plurality of spray openings 7.
  • the nozzle body 2 is connected to an outer pole 9 of a magnet coil 10.
  • the magnet coil 10 is wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10.
  • the solenoid 10 is excited via a line, not shown, by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 can be surrounded by a plastic sheath not shown.
  • the valve needle 3 is non-positively connected to an armature 20 via a flange 14, into which the valve needle 3 is inserted and connected to the valve needle 3 by means of a weld seam 15.
  • the flange 14 can be integrally formed with the armature 20 or welded to it or be glued.
  • a return spring 23 is arranged, which in the present design of the fuel injection valve 1 is preloaded by a sleeve 24.
  • the fuel is fed to the fuel injection valve 1 via a central fuel feed 16. It is conducted to the sealing seat via a bore 29 in the armature 20, the tubular valve needle 3 and through flow openings 8 in the valve needle 3.
  • the fuel injection valve 1 has an elastic membrane 18 on an inlet end 11 of the inner pole 13, which is connected to the inner pole 13, for example, by means of a circumferential weld seam 21. At least one opening 22 is formed in the membrane 18.
  • the membrane 18 is operatively connected to the armature 20 via a plunger 25, which passes through the sleeve 24 and the return spring 23. To secure the plunger 25 against slipping on the armature 20, the plunger 25 is inserted into a blind bore 26 in the armature 20.
  • the pestle 25 can be connected to the membrane 18, for example by means of a weld seam 27.
  • the armature 20 is acted upon by the return spring 23 so that the at least one opening 22 of the membrane 18 is covered by the inner pole 13, since the membrane 18 is flat on the inlet end 11 of the Inner pole 13 rests and the plunger 25, which is operatively connected to the armature 20, is in its position
  • 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 valve needle 3, which is operatively connected to the flange 14 on the armature 20, moves counter to the stroke direction.
  • the plunger 25 returns to its starting position due to the drop of the armature 20 from the inner pole 13 and the pretension of the membrane 18 which is non-positively connected to the plunger 25.
  • the at least one opening 22 is again covered by the inner pole 13.
  • a characteristic curve which represents the dynamic flow q ⁇ yn of fuel through the fuel injection valve as a function of a stroke h of the valve needle 3 can be set or modeled.
  • the measures described can improve the dynamics of the fuel injector 1 and reduce the production costs, since the construction of an anchor free path is eliminated and the minimum amount of fuel flowing through the fuel injector 1 is minimized.
  • the at least one opening 22 in the membrane 18 is dimensioned such that it does not act as a throttle, but rather allows an unthrottled fuel flow through the fuel injection valve 1 after its release.
  • the invention is not limited to the illustrated embodiment and z. B. also applicable for fuel injection valves 1 for mixture-compressing, self-igniting internal combustion engines.

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)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel injection valve (1) comprising a solenoid (10), which interacts with an armature (20) acted upon by a return spring (23). Said armature, together with a valve needle (3) forms an axially displaceable valve part. A valve closing body (4) is provided on the valve needle (3) and forms a tight seat with a valve seat body (5). An inner pole (13) and an outer pole (9), together with the solenoid (10), forms a magnetic circuit. A diaphragm (18) is situated on a supply face (11) of the inner pole (13) and has at least one opening (22), which is covered by the inner pole (13) when the fuel injection valve (1) is closed.

Description

Brennstoffeinspritz entil Fuel injection entil
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.
Beispielsweise ist aus der DE 196 26 576 AI ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, bei welchem zur elektromagnetischen Betätigung ein Anker mit einer elektrisch erregbaren Magnetspule zusammenwirkt und der Hub des Ankers über eine Ventilnadel auf einen Ventilschließkörper übertragen wird. Der Ventilschließkörper wirkt mit einer Ventilsitzfläche zu einem Dichtsitz zusammen. Im Anker sind mehrere Brennstoffkanäle vorgesehen. Die Rückstellung des Ankers erfolgt mit einer Rückstellfeder.For example, from DE 196 26 576 AI an electromagnetically actuated fuel injection valve is known, in which an armature interacts with an electrically excitable solenoid for electromagnetic actuation and the stroke of the armature is transmitted to a valve closing body via a valve needle. The valve closing body interacts with a valve seat surface to form a sealing seat. Several fuel channels are provided in the anchor. The armature is reset using a return spring.
Nachteilig bei dem aus der DE 196 26 576 AI bekannten Brennstoffeinspritzventil ist insbesondere, daß die das Brennstoffeinspritzventil durchfließende dynamische Brennstoffmenge qyn bei Abheben des Ventilschließkörpers vom D chts tz nicht genau genug dosiert werden kann. Insbesondere ist das Verhältnis von maximal abgespritzter Brennstoffmenge zu minimal abgespritzter Brennstoffmenge qmax/qmin relativ klein. Die Kennlinie des Brennstoffeinspritzventils , welche den Verlauf der dynamischen Durchflußmenge qdyn in Abhängigkeit vom Hub der Ventilnadel darstellt, ist relativ flach, so daß starke Schwankungen im dynamischen Durchfluß auftreten.A disadvantage of the fuel injector known from DE 196 26 576 AI is in particular that the dynamic fuel quantity qyn flowing through the fuel injector cannot be dosed precisely enough when the valve closing body is lifted from the valve. Specifically, the ratio of maximum to minimum fuel quantity abgespritzter abgespritzter fuel quantity q max / q m i n is relatively small. The characteristic of the fuel injector, which shows the course of the represents dynamic flow rate q d yn depending on the stroke of the valve needle, is relatively flat, so that strong fluctuations occur in the dynamic flow.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Brennstoffström durch das Brennstoffeinspritzventil mittels einer an einer Zulaufseitigen Stirnseite des Innenpols angeordneten Membran so lange unterbunden ist, bis die Membran durch elastische Verformung angehoben wird und dabei zumindest eine Öffnung in der Membran freigegeben wird. Der dadurch einsetzende Brennstoffström folgt einer annähernd stufenförmigen Hubdrosseifunktion.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that the fuel flow through the fuel injector is prevented by means of a membrane arranged on an inlet-side end face of the inner pole until the membrane is lifted by elastic deformation and at least one opening in the Membrane is released. The resulting fuel flow follows an approximately step-shaped lifting throttle function.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinsprit-zv-entils-. möglich.The measures listed in the subclaims are advantageous further developments of the fuel injection specified in the main claim. possible.
Von Vorteil ist insbesondere, daß die Membran durch eine einfache Konstruktion über einen Stößel mit dem Anker in Wirkverbindung steht. Die einzelnen Teile sind einfach und kostengünstig herstellbar.It is particularly advantageous that the membrane is operatively connected to the armature by a simple construction via a plunger. The individual parts are simple and inexpensive to manufacture.
Vorteilhafterweise sind der Stößel und die Membran sowie die Membran und der Innenpol mittels Schweißnähten miteinander verbunden.The plunger and the membrane as well as the membrane and the inner pole are advantageously connected to one another by means of weld seams.
Der Stößel ist in eine Sackbohrung des Ankers eingesteckt und somit auf einfache Art gegen Verrutschen gesichert.The plunger is inserted into a blind hole in the armature and is thus easily secured against slipping.
Von Vorteil ist zudem, daß der Stößel die Rückstellfeder, welche den Anker beaufschlagt, und die Hülse, welche die Rückstellfeder auf Vorspannung bringt, durchgreift, wodurch die Anordnung kompakt und platzsparend in das Brennstoffeinspritzventil integriert ist. Weiterhin ist von Vorteil, daß die zumindest eine Öffnung so dimensioniert ist, daß sie nicht als Drossel wirkt und damit keine Hubdrosselung auftritt.It is also advantageous that the plunger passes through the return spring, which acts on the armature, and the sleeve, which biases the return spring, whereby the arrangement is integrated in the fuel injector in a compact and space-saving manner. Another advantage is that the at least one opening is dimensioned so that it does not act as a throttle and thus no stroke throttling occurs.
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 eine schematische Darstellung der dynamischen Durchflußmenge qa.yn n Abhängigkeit vom Hub der Ventilnadel des in Fig. 1 dargestellten erfindungsgemäßen Brennstoffeinspritzventils .Fig. 2 is a schematic representation of the dynamic flow qa . yn n as a function of the stroke of the valve needle of the fuel injector according to the invention shown in FIG. 1.
Beschreibung des Ausfϋh ung.sbeispielsDescription of the execution example
Fig. 1 zeigt in einer auszugsweisen Schnittdarstellung ein Ausführungsbeispiel eines erfindungsgemäßenFig. 1 shows an exemplary sectional view of an embodiment of an inventive
Brennstoffeinspritzventils 1. Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine .Fuel injection valve 1. The fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines. The fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
Das Brennstoffeinspritzventil 1 besteht aus einem rohrför igen 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 mehrere Abspritzöffnungen 7 verfügt.The fuel injector 1 consists of a tube-shaped 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 an inward opening one Fuel injection valve 1, which has a plurality of spray openings 7.
Der Düsenkörper 2 ist mit einem Außenpol 9 einer Magnetspule 10 verbunden. Die Magnetspule 10 ist auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Die Magnetspule 10 wird über eine nicht weiter dargestellte Leitung von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 kann von einer nicht weiter dargestellten KunstSto fummantelung umgeben sein.The nozzle body 2 is connected to an outer pole 9 of a magnet coil 10. The magnet coil 10 is wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10. The solenoid 10 is excited via a line, not shown, by an electrical current that can be supplied via an electrical plug contact 17. The plug contact 17 can be surrounded by a plastic sheath not shown.
Die Ventilnadel 3 steht über einen Flansch 14, in den die Ventilnadel 3 eingeschoben und mittels einer Schweißnaht 15 mit der Ventilnadel 3 verbunden ist, in kraftschlüssiger Verbindung mit einem Anker 20. Dabei kann der Flansch 14 einstückig mit dem Anker 20 ausgebildet oder mit diesem verschweißt oder verklebt sein. In einer Ausnehmung 19 des Ankers 20 ist eine Rückstellfeder 23 angeordnet, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird.The valve needle 3 is non-positively connected to an armature 20 via a flange 14, into which the valve needle 3 is inserted and connected to the valve needle 3 by means of a weld seam 15. The flange 14 can be integrally formed with the armature 20 or welded to it or be glued. In a recess 19 of the armature 20, a return spring 23 is arranged, which in the present design of the fuel injection valve 1 is preloaded by a sleeve 24.
Der Brennstoff wird dem Brennstoffeinspritzventil 1 über eine zentrale Brennstoffzufuhr 16 zugeleitet. Er wird über eine Bohrung 29 im Anker 20, die rohrförmig ausgeführte Ventilnadel 3 und über Durchströmöffnungen 8 in der Ventilnadel 3 zum Dichtsitz geleitet.The fuel is fed to the fuel injection valve 1 via a central fuel feed 16. It is conducted to the sealing seat via a bore 29 in the armature 20, the tubular valve needle 3 and through flow openings 8 in the valve needle 3.
Erfindungsgemäß weist das Brennstoffeinspritzventil 1 an einer Zulaufseitigen Stirnseite 11 des Innenpols 13 eine elastische Membran 18 auf, welche beispielsweise mittels einer umlaufenden Schweißnaht 21 mit dem Innenpol 13 verbunden ist. In der Membran 18 ist zumindest eine Öffnung 22 ausgebildet. Die Membran 18 steht über einen Stößel 25, welcher die Hülse 24 und die Rückstellfeder 23 durchgreift, mit dem Anker 20 in Wirkverbindung. Zur Sicherung des Stößels 25 gegen Verrutschen am Anker 20 ist der Stößel 25 in eine Sackbohrung 26 des Ankers 20 eingesteckt. Der Stößel 25 kann mit der Membran 18 beispielsweise mittels einer Schweißnaht 27 verbunden sein.According to the invention, the fuel injection valve 1 has an elastic membrane 18 on an inlet end 11 of the inner pole 13, which is connected to the inner pole 13, for example, by means of a circumferential weld seam 21. At least one opening 22 is formed in the membrane 18. The membrane 18 is operatively connected to the armature 20 via a plunger 25, which passes through the sleeve 24 and the return spring 23. To secure the plunger 25 against slipping on the armature 20, the plunger 25 is inserted into a blind bore 26 in the armature 20. The pestle 25 can be connected to the membrane 18, for example by means of a weld seam 27.
In dem in Fig. 1 dargestellten geschlossenen Zustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 so beaufschlage, daß die zumindest eine Öffnung 22 der Membran 18 durch den Innenpol 13 abgedeckt ist, da die Membran 18 plan auf der Zulaufseitigen Stirnseite 11 des Innenpols 13 aufliegt und sich der mit dem Anker 20 in Wirkverbindung stehende Stößel 25 in seinerIn the closed state of the fuel injector 1 shown in Fig. 1, the armature 20 is acted upon by the return spring 23 so that the at least one opening 22 of the membrane 18 is covered by the inner pole 13, since the membrane 18 is flat on the inlet end 11 of the Inner pole 13 rests and the plunger 25, which is operatively connected to the armature 20, is in its position
Ruhelage befindet, so daß die Membran 18 nicht durch denIs in the rest position so that the membrane 18 is not through the
Stößel 25 verformt wird. Der an der Ventilnadel 3 ausgebildete Ventilschließkörper 4 wird am Ventilsitz 6 inRam 25 is deformed. The valve closing body 4 formed on the valve needle 3 is in the valve seat 6 in
'dichtender Anlage gehalten. Ein zwischen der Stirnfläche 30 des Ankers 20 und dem Innenpol 13 ausgebildeter Arbeitsspalt 28 ist geöffnet. ' sealing plant kept. A working gap 28 formed between the end face 30 of the armature 20 and the inner pole 13 is opened.
Wird die Magnetspule 10 mittels der nicht weiter dargestellten elektrischen Leitung über den Steckkontakt 17 erregt, baut sich ein Magnetfeld auf, welches den Anker 20 entgegen der Kraft der Rückstellfeder 23 an den Innenpol 13 zieht. Der Arbeitsspalt 28 zwischen der Zulaufseitigen Stirnfläche 11 des Ankers 20 und dem Innenpol 13 wird dabei geschlossen. Der in der Sackbohrung 26 des Ankers 20 steckende Stößel 25 wird durch die Bewegung des Ankers 20 ebenfalls in einer Hubrichtung gegen den Druck der Membran 18 bewegt. Dadurch wird die Membran 18 in Hubrichtung aufgewölbt. Die zumindest eine Öffnung 22 wird durch das Abheben der Membran von der zulaufseitigen Stirnseite 11 des Innenpols 13 freigegeben, so daß der über die zentrale Brennstoffzufuhr 16 zugeleitete Brennstoff durch die zumindest eine Öffnung 22 sowie die Bohrung 29 im Anker 20 und die Ventilnadel 3 zum Dichtsitz strömen kann.If the solenoid 10 is excited by means of the electrical line (not shown) via the plug contact 17, a magnetic field builds up, which pulls the armature 20 against the force of the return spring 23 to the inner pole 13. The working gap 28 between the inlet-side end face 11 of the armature 20 and the inner pole 13 is closed. The plunger 25 inserted in the blind bore 26 of the armature 20 is also moved in a stroke direction against the pressure of the membrane 18 by the movement of the armature 20. As a result, the membrane 18 is bulged in the stroke direction. The at least one opening 22 is released by lifting the membrane from the inlet end 11 of the inner pole 13, so that the fuel supplied via the central fuel supply 16 through the at least one opening 22 and the bore 29 in the armature 20 and the valve needle 3 to the sealing seat can flow.
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 die mit dem Flansch 14 am Anker 20 in Wirkverbindung- stehende Ventilnadel 3 entgegen der Hubrichtung bewegt. Dadurch setzt der Ventilschließkörper 4 auf der Ventilsitzfläche 6 auf und das Brennstoffeinspritzventil 1 wird geschlossen. Der Stößel 25 kehrt durch den Abfall des Ankers 20 vom Innenpol 13 und die Vorspannung der mit dem Stößel 25 kraftschlüssig verbundenen Membran 18 in seine Ausgangslage zurück. Die zumindest eine Öffnung 22 ist wieder durch den Innenpol 13 abgedeckt .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 valve needle 3, which is operatively connected to the flange 14 on the armature 20, moves counter to the stroke direction. This sets the valve closing body 4 on the valve seat 6 and the fuel injector 1 is closed. The plunger 25 returns to its starting position due to the drop of the armature 20 from the inner pole 13 and the pretension of the membrane 18 which is non-positively connected to the plunger 25. The at least one opening 22 is again covered by the inner pole 13.
Fig. 2 zeigt eine schematische Darstellung der das Brennstoffeinspritzventil durchströmenden Durchflußmenge qdyn in Abhängigkeit vom Hub h der Ventilnadel 3 des Brennstoffeinspritzventils 1.2 shows a schematic representation of the flow rate q dy ni n flowing through the fuel injector as a function of the stroke h of the valve needle 3 of the fuel injector 1.
Durch die vorstehend beschriebene Anordnung der zumindest einen Öffnung 22 in der Membran 18 kann eine Kennlinie, welche den dynamischen Durchfluß q^yn von Brennstoff durch das Brennstoffeinspritzventil in Abhängigkeit von einem Hub h der Ventilnadel 3 darstellt, eingestellt bzw. modelliert werden. Durch entsprechende Hubeinstellung der Ventilnadel 3 fließt dann so viel Brennstoff durch das Brennstoffeinspritzventil 1, wie es im Rahmen der zu erzielenden Durchflußgenauigkeit notwendig ist.Through the arrangement of the at least one opening 22 in the membrane 18 described above, a characteristic curve which represents the dynamic flow q ^ yn of fuel through the fuel injection valve as a function of a stroke h of the valve needle 3 can be set or modeled. By adjusting the stroke of the valve needle 3 accordingly, as much fuel flows through the fuel injector 1 as is necessary within the scope of the flow accuracy to be achieved.
Durch die Abdeckung der zumindest einen Öffnung 22 durch den Innenpol 13 kann zu Beginn des OffnungsVorgangs kein Brennstoff zum Dichtsitz strömen. Erst bei Freigabe der zumindest einen Öffnung 22 durch Anheben der Membran 18 durch de ' Stößel 25 beim Anziehen des Ankers 20 steigt der dynamische Durchfluß q^yn schnell und annähernd stufenförmig auf einen Sättigungswert an, wie in Fig. 2 dargestellt.By covering the at least one opening 22 through the inner pole 13, no fuel can flow to the sealing seat at the beginning of the opening process. Only upon release of the at least one opening 22 by raising of the membrane 18 by de 'plunger 25 during tightening of the anchor 20 of the dynamic flow rate q ^ y n increases rapidly, and approximately stepwise to a saturation value, as shown in Fig. 2.
Durch die beschriebenen Maßnahmen können die Dynamik des Brennstoffeinspritzventils 1 verbessert und die Herstellungskosten gesenkt werden, da die Konstruktion eines Ankerfreiwegs entfällt und die Minimierung der minimalen das Brennstoffeinspritzventil 1 durchströmenden Brennstoffmenge erzielt wird. Die zumindest eine Öffnung 22 in der Membran 18 ist dabei so dimensioniert, daß sie nicht als Drossel wirkt, sondern nach ihrer Freigabe einen ungedrosselten Brennstoffström durch das Brennstoffeinspritzventil 1 erlaubt.The measures described can improve the dynamics of the fuel injector 1 and reduce the production costs, since the construction of an anchor free path is eliminated and the minimum amount of fuel flowing through the fuel injector 1 is minimized. The at least one opening 22 in the membrane 18 is dimensioned such that it does not act as a throttle, but rather allows an unthrottled fuel flow through the fuel injection valve 1 after its release.
Die Erfindung . ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und z. B. auch für Brennstoffeinspritzventile 1 für gemischverdichtende, selbstzündende Brennkraftmaschinen anwendbar. The invention . is not limited to the illustrated embodiment and z. B. also applicable for fuel injection valves 1 for mixture-compressing, self-igniting internal combustion engines.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) mit einer Magnetspule (10), die mit einem von einer Rückstellfeder (23) beaufschlagten1. Fuel injection valve (1) with a magnetic coil (10), which is acted upon by a return spring (23)
Anker (20) zusammenwirkt, der zusammen mit einer VentilnadelAnchor (20) cooperates with a valve needle
(3) ein axial bewegliches Ventilteil bildet, wobei an der(3) forms an axially movable valve part, on which
Ventilnadel (3) ein Ventilschließkörper (4) vorgesehen ist, der mit einem Ventilsitzkörper (5) einen Dichtsitz bildet, sowie einem Innenpol (13) und einem Außenpol _(9) , die mit der Magnetspule (10) einen Magnetkreis bilden, dadurch gekennzeichnet/ daß an einer zulaufseitigen Stirnseite (11) des Innenpols (13) eine Membran (18) angeordnet ist, welche zumindest eine Öffnung (22) aufweist, die in einem geschlossenen Zustand des Brennstoffeinspritzventils (1) abgedeckt ist.Valve needle (3) a valve closing body (4) is provided, which forms a sealing seat with a valve seat body (5), and an inner pole (13) and an outer pole _ (9), which form a magnetic circuit with the magnet coil (10), characterized / That a membrane (18) is arranged on an inlet-side end face (11) of the inner pole (13), which has at least one opening (22) which is covered when the fuel injection valve (1) is closed.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Membran (18) über einen Stößel (25) mit dem Anker (20) in Wirkverbindung steht.2. Fuel injection valve according to claim 1, characterized in that the membrane (18) via a plunger (25) with the armature (20) is in operative connection.
3. Brennstof einspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß der Stößel (25) in einer Sackbohrung (26) des Ankers (20) gesichert ist.3. Fuel injection valve according to claim 2, characterized in that the plunger (25) is secured in a blind bore (26) of the armature (20).
4. Brennstoffeinspritzventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Stößel (25) kraftschlüssig mit der Membran (18) verbunden ist.4. Fuel injection valve according to claim 2 or 3, characterized in that the plunger (25) is non-positively connected to the membrane (18).
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß die Membran (18) mit dem Stößel (25) über eine Schweißnaht (27) verbunden ist.5. Fuel injection valve according to claim 4, characterized in that the membrane (18) with the tappet (25) via a weld seam (27) is connected.
6. Brennstoffeinspritzventil nach einem der Ansprüche 2 bis6. Fuel injection valve according to one of claims 2 to
5, dadurch gekennzeichnet, daß der Stößel (25) die Rückstellfeder (23) sowie eine die5, characterized in that the plunger (25), the return spring (23) and a
Rückstellfeder (23) auf Vorspannung bringende Hülse (24) durchgreift .The return spring (23) engages the sleeve (24) which brings the preload.
7. Brennstoffeinspritzventil nach Anspruch 6, dadurch gekennzeichnet, daß die Rückstellfeder (23) den Anker (20) mit einer Vorspannung beaufschlagt.7. Fuel injection valve according to claim 6, characterized in that the return spring (23) acts on the armature (20) with a bias.
8. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Membran (18) mittels einer umlaufenden Schweißnaht8. Fuel injection valve according to one of claims 1 to 7, characterized in that the membrane (18) by means of a circumferential weld seam
(21) mit der Zulaufseitigen Stirnseite (11) des Innenpols (13) verbunden ist.(21) is connected to the inlet-side end face (11) of the inner pole (13).
9. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß in einem geöffneten Zustand des9. Fuel injection valve according to one of claims 1 to 8, characterized in that in an open state of
Brennstoffeinspritzventils (1) die zumindest eine ÖffnungFuel injection valve (1) which has at least one opening
(22) der Membran (18) mittels elastischer Verformung der Membran (18) durch den Stößel (25) freigegeben ist .(22) of the membrane (18) is released by means of elastic deformation of the membrane (18) by the plunger (25).
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis10. Fuel injection valve according to one of claims 1 to
9, dadurch gekennzeichnet, daß die Öffnung (22) der Membran (18) im geschlossenen Zustand des Brennstoffeinspritzventils (1) durch den Innenpol (13) abgedeckt ist. 9, characterized, that the opening (22) of the membrane (18) in the closed state of the fuel injector (1) is covered by the inner pole (13).
EP02748592A 2001-06-22 2002-06-18 Fuel injection valve Expired - Lifetime EP1402173B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130208A DE10130208A1 (en) 2001-06-22 2001-06-22 Fuel injector
DE10130208 2001-06-22
PCT/DE2002/002209 WO2003001052A1 (en) 2001-06-22 2002-06-18 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1402173A1 true EP1402173A1 (en) 2004-03-31
EP1402173B1 EP1402173B1 (en) 2004-12-29

Family

ID=7689117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02748592A Expired - Lifetime EP1402173B1 (en) 2001-06-22 2002-06-18 Fuel injection valve

Country Status (6)

Country Link
US (1) US6899293B2 (en)
EP (1) EP1402173B1 (en)
JP (1) JP4225893B2 (en)
KR (1) KR20030036713A (en)
DE (2) DE10130208A1 (en)
WO (1) WO2003001052A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBO20040466A1 (en) 2004-07-23 2004-10-23 Magneti Marelli Holding Spa FUEL INJECTOR WITH ELECTROMAGNETIC ACTUATION
EP2246554B1 (en) * 2009-04-20 2012-06-27 Continental Automotive GmbH Valve assembly for an injection valve and injection valve
EP2375051A1 (en) * 2010-04-09 2011-10-12 Continental Automotive GmbH Valve assembly for an injection valve and injection valve

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Publication number Priority date Publication date Assignee Title
DE2936425A1 (en) 1979-09-08 1981-04-02 Robert Bosch Gmbh, 7000 Stuttgart ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
DE3735526C2 (en) * 1986-10-24 1999-01-21 Denso Corp Electromagnetic fuel injector
US5353991A (en) * 1989-06-21 1994-10-11 General Motors Corporation Solenoid actuated valve assembly
DE4413217A1 (en) * 1994-04-15 1995-10-19 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
AT1622U1 (en) * 1995-02-28 1997-08-25 Avl Verbrennungskraft Messtech INJECTION SYSTEM WITH AN INJECTION VALVE FOR A SELF-IGNITING INTERNAL COMBUSTION ENGINE
DE19626576A1 (en) * 1996-07-02 1998-01-08 Bosch Gmbh Robert Fuel injection valve for internal combustion engine
FR2761114B1 (en) * 1997-03-24 1999-06-25 Peugeot Motocycles Sa DEVICE FOR DAMPING REFLECTED FUEL PRESSURE WAVES IN A FUEL INJECTION SYSTEM
DE19712921A1 (en) * 1997-03-27 1998-10-01 Bosch Gmbh Robert Fuel injector with piezoelectric or magnetostrictive actuator
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See references of WO03001052A1 *

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JP2004521253A (en) 2004-07-15
US6899293B2 (en) 2005-05-31
WO2003001052A1 (en) 2003-01-03
DE50201912D1 (en) 2005-02-03
DE10130208A1 (en) 2003-01-02
KR20030036713A (en) 2003-05-09
US20040011899A1 (en) 2004-01-22
EP1402173B1 (en) 2004-12-29
JP4225893B2 (en) 2009-02-18

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