EP1364117B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1364117B1
EP1364117B1 EP02717971A EP02717971A EP1364117B1 EP 1364117 B1 EP1364117 B1 EP 1364117B1 EP 02717971 A EP02717971 A EP 02717971A EP 02717971 A EP02717971 A EP 02717971A EP 1364117 B1 EP1364117 B1 EP 1364117B1
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EP
European Patent Office
Prior art keywords
armature
fuel injection
clamping sleeve
injection valve
valve needle
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.)
Expired - Lifetime
Application number
EP02717971A
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German (de)
French (fr)
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EP1364117A1 (en
Inventor
Ferdinand Reiter
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • 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

Definitions

  • the invention is based on a fuel injection valve according to the preamble of independent claim 1.
  • a fuel injection valve for fuel injection systems of internal combustion engines which has a magnetic coil, an acted upon by the solenoid coil in a stroke direction against a return spring and an associated with a valve closing member valve needle.
  • the armature is movable between a first stop connected to the valve needle and limiting the movement of the armature in the stroke direction, and a second stop connected to the valve needle and limiting the movement of the armature against the stroke direction.
  • a damping spring in the form of a plate spring is arranged.
  • a disadvantage of the fuel injection valve known from DE 198 49 210 A1 on the one hand, that the manufacturing and assembly costs are increased by at least one additional component. On the other hand, it can be offset, for example, by obliquely inserting the disc spring or by the manufacturing tolerances occurring during production or to tilt the armature during operation of the fuel injector. The result is large variations in the Ankerkeweg or in the height of the Vorhubspalts. Both factors can lead to malfunction in the operation of the fuel injection valve.
  • the fuel injection valve according to the invention with the characterizing features of the independent claim has the advantage that a forward stroke of the armature can be adjusted very precisely and without damage to the components used by a can be pushed onto the valve needle and arbitrarily positionable clamping sleeve with little effort.
  • a particular advantage is that a lateral slot in the clamping sleeve allows easy assembly by a resilient bias of the tubular member, wherein the clamping force of the clamping sleeve is selected by its axial length to match the weight of the armature.
  • a particular advantage is that the production of the overall component can be done quickly and inexpensively, since the clamping sleeve and the intermediate ring are easy to produce and no other components are needed.
  • the fuel injection valve 1 is embodied in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is in operative connection with a Valve-closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15 there is an armature 20. This is connected via a Mitauerflansch 21 non-positively with the valve needle 3 in connection, which is connected by a weld 22 with the Mit psychologyflansch 21.
  • a return spring 23 On the Mitauerflansch 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • a clamping sleeve 31 which is mounted on the valve needle 3, serves as a lower anchor stop.
  • An intermediate ring 32 which rests on the clamping sleeve 31, avoids bouncing when closing the fuel injection valve 1.
  • FIGS. 2A and 2B A detailed illustration of the clamping sleeve 31 can be seen in FIGS. 2A and 2B.
  • the armature 20 and the valve seat body 5 run fuel channels 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the injection opening 7.
  • the fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.
  • the Mit supportiveflansch 21 is acted upon the valve needle 3 by the return spring 23 against its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement.
  • the armature 20 rests on the intermediate ring 32, which is supported on the clamping sleeve 31.
  • This 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 of the armature 20 is divided into a forward stroke, which serves to close a Vorhubspalts 38, and an opening stroke, which is determined by a in the rest position between the inner pole 13 and the armature 20 working gap 27.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the Mit supportiveflansch 21 from the inner pole 13, whereby the valve needle 3 moves against the stroke direction.
  • the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed.
  • the armature 20 is seated on the clamping sleeve 31 or on the intermediate ring 32.
  • FIG. 2A shows an excerpt from the section IIA in FIG Inventive designed fuel injector 1. Matching components are provided in all figures with matching reference numerals.
  • the lower anchor stop is formed by the clamping sleeve 31 or the intermediate ring 32 pushed onto the valve needle 3.
  • the intermediate ring 32 serves on the one hand to compensate for inaccuracies in the surface of an inlet end 34 of the clamping sleeve 31, on the other hand as a damper against Ankerpreller when closing the fuel injector 1. Bounces namely the armature 20 when closing at the inlet end 34 of the clamping sleeve 31, could it comes through the reversal of movement of the armature 20 lack of damping to another, unwanted short-term opening stroke.
  • a plate spring 39 may be provided to press the armature 20 in the de-energized state against the intermediate ring 32.
  • the clamping sleeve 31 is such that a damage-free mounting on the valve needle 3 is possible.
  • the clamping sleeve 31 at its inflow-side end 34 as well as at a drain-side end 35 on a radially inner wall 36 bevels 37 and chamfers, which are for example wedge-shaped, conical and prevent 31 during the assembly of the clamping sleeve Materialabspan with subsequent contamination of the valve interior and malfunction of the fuel injection valve 1 by clogging of the fuel channels 30b and 30c or the injection port 7 occur.
  • the clamping sleeve 31 must be fixed to the valve needle 3 so that it can withstand the impact force due to the inertial mass of the armature 20.
  • the clamping force can be adjusted as required by the slotted shape of the clamping sleeve 31 over the axial length of the clamping sleeve 31, since the frictional forces between the valve needle 3 and the inner wall 36 of the clamping sleeve 31 depends on the size of the common contact surface.
  • clamping sleeve 31 is made of an alloy of soft metals, such as a copper-tin alloy.
  • a possible such delivery would be z. B. CuSn 6 .
  • FIG. 2B shows a section through the detail shown in FIG. 2A from the fuel injection valve 1 designed according to the invention along the line IIB-IIB.
  • the clamping sleeve 31 has a slot 33 which ensures that the clamping sleeve 31 on the one hand easily and without damage to the valve needle 3 can be pushed, and on the other hand by the resulting bias for a reliable fixation of the clamping sleeve 31 in the each selected position on the valve needle 3 provides.
  • the position of the clamping sleeve 31 and thus the height of the Vorhubspalts 38 can be easily adjusted.
  • the plan view of the inlet-side end 34 of the clamping sleeve 31 again shows the chamfer or bevel 37, which is wedge-shaped, conical in the present embodiment and extends over the entire circumference of the clamping sleeve 31 outside of the slot 33.
  • the invention is not limited to the illustrated embodiment and also for other forms of anchors 20, for example, for immersion and flat anchors, as well as any designs of fuel injectors 1 applicable.

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

Description

Stand der TechnikState of the art

Die Erfindung geht ausvon einem Brennstoffeinspritzventil nach dem Oberbegriff des unabhängigen Anspruchs1.The invention is based on a fuel injection valve according to the preamble of independent claim 1.

Aus der DE 198 49 210 A1 ist bereits ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen bekannt, welches eine Magnetspule, einen durch die Magnetspule in eine Hubrichtung gegen eine Rückstellfeder beaufschlagbaren Anker und eine mit einem Ventilschließkörper in Verbindung stehende Ventilnadel aufweist. Der Anker ist zwischen einem mit der Ventilnadel verbundenen, die Bewegung des Ankers in der Hubrichtung begrenzenden ersten Anschlag und einem mit der Ventilnadel verbundenen, die Bewegung des Ankers entgegen der Hubrichtung begrenzenden zweiten Anschlag beweglich. Zwischen dem zweiten Anschlag und dem Anker ist eine Dämpfungsfeder in Form einer Tellerfeder angeordnet.From DE 198 49 210 A1 a fuel injection valve for fuel injection systems of internal combustion engines is already known, which has a magnetic coil, an acted upon by the solenoid coil in a stroke direction against a return spring and an associated with a valve closing member valve needle. The armature is movable between a first stop connected to the valve needle and limiting the movement of the armature in the stroke direction, and a second stop connected to the valve needle and limiting the movement of the armature against the stroke direction. Between the second stop and the armature, a damping spring in the form of a plate spring is arranged.

Nachteilig an dem aus der DE 198 49 210 A1 bekannten Brennstoffeinspritzventil ist zum einen, daß der Fertigungs-und Montageaufwand durch zumindest ein zusätzliches Bauteil erhöht ist. Zum anderen kann es beispielsweise durch schiefes Einlegen der Tellerfeder oder durch die bei der Herstellung auftretenden Fertigungstoleranzen zu Versätzen oder zum Verkanten des Ankers während des Betriebs des Brennstoffeinspritzventils kommen. Die Folge sind starke Streuungen beim Ankerfreiweg bzw. in der Höhe des Vorhubspalts. Beide Faktoren können zu Fehlfunktionen beim Betrieb des Brennstoffeinspritzventils führen.A disadvantage of the fuel injection valve known from DE 198 49 210 A1, on the one hand, that the manufacturing and assembly costs are increased by at least one additional component. On the other hand, it can be offset, for example, by obliquely inserting the disc spring or by the manufacturing tolerances occurring during production or to tilt the armature during operation of the fuel injector. The result is large variations in the Ankerfreiweg or in the height of the Vorhubspalts. Both factors can lead to malfunction in the operation of the fuel injection valve.

DE 198 16 315 A1 offenbart ein Bremmstoffeinspritzventil mit einem Vorhubspalt zwischen dem Anker und dem mit der Ventilnadel verbundenen Anschlag.DE 198 16 315 A1 discloses a Bremmstoffeinspritzventil with a Vorhubspalt between the armature and connected to the valve needle stop.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des unabhängigen Anspruchs hat demgegenüber den Vorteil, daß ein Vorhub des Ankers durch eine auf die Ventilnadel aufschiebbare und beliebig positionierbare Klemmhülse mit geringem Aufwand sehr genau und ohne Beschädigungen der verwendeten Bauteile einstellbar ist.The fuel injection valve according to the invention with the characterizing features of the independent claim has the advantage that a forward stroke of the armature can be adjusted very precisely and without damage to the components used by a can be pushed onto the valve needle and arbitrarily positionable clamping sleeve with little effort.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im unabhängigen Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements of the independent claim 1 fuel injector are possible.

Von Vorteil ist insbesondere, daß ein seitlicher Schlitz in der Klemmhülse eine leichte Montage durch eine elastische Vorspannung des rohrförmigen Bauteils ermöglicht, wobei die Klemmkraft der Klemmhülse durch ihre axiale Länge passend zum Gewicht des Ankers wählbar ist.A particular advantage is that a lateral slot in the clamping sleeve allows easy assembly by a resilient bias of the tubular member, wherein the clamping force of the clamping sleeve is selected by its axial length to match the weight of the armature.

Durch die besondere Form der konischen Abschrägungen der Klemmhülse wird vorteilhafterweise sichergestellt, daß eine beschädigungsfreie Montage möglich ist.Due to the special shape of the conical bevels of the clamping sleeve is advantageously ensured that a damage-free assembly is possible.

Von Vorteil ist insbesondere, daß die Herstellung des Gesamtbauteils schnell und kostengünstig erfolgen kann, da die Klemmhülse und der Zwischenring leicht herstellbar sind und keine weiteren Bauteile benötigt werden.A particular advantage is that the production of the overall component can be done quickly and inexpensively, since the clamping sleeve and the intermediate ring are easy to produce and no other components are needed.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils,
Fig. 2A
einen schematischen Ausschnitt im Bereich IIA in Fig. 1 aus dem erfindungsgemäß ausgestalteten Brennstoffeinspritzventil, und
Fig. 2B
einen schematischen Querschnitt durch den in Fig. 2A dargestellten Ausschnitt des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils entlang der Linie IIB-IIB in Fig. 2A.
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
a schematic section through an embodiment of an inventively designed fuel injector,
Fig. 2A
a schematic section in the area IIA in Fig. 1 from the inventively designed fuel injection valve, and
Fig. 2B
a schematic cross section through the section shown in Fig. 2A of the inventively designed fuel injection valve along the line IIB-IIB in Fig. 2A.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Bevor anhand der Fig. 2A und 2B ein bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1 näher beschrieben wird, soll zum besseren Verständnis der Erfindung zunächst anhand von Fig. 1 das Brennstoffeinspritzventil 1 bezüglich seiner wesentlichen Bauteile kurz erläutert werden.Before a preferred embodiment of a fuel injection valve 1 according to the invention is described in detail with reference to FIGS. 2A and 2B, the fuel injection valve 1 will be briefly explained with respect to its essential components for a better understanding of the invention with reference to FIG.

Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 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.The fuel injection valve 1 is embodied in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht 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 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen den 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 injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged. The valve needle 3 is in operative connection with a Valve-closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7. The nozzle body 2 is sealed by a seal 8 against the outer pole 9 of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated by a gap 26 and are based on a connecting member 29 from. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.

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

Eine Klemmhülse 31, die auf der Ventilnadel 3 angebracht ist, dient als unterer Ankeranschlag. Ein Zwischenring 32, welcher auf der Klemmhülse 31 aufliegt, vermeidet Prellen beim Schließen des Brennstoffeinspritzventils 1. Eine detaillierte Darstellung der Klemmhülse 31 ist den Fig. 2A und 2B zu entnehmen.A clamping sleeve 31, which is mounted on the valve needle 3, serves as a lower anchor stop. An intermediate ring 32, which rests on the clamping sleeve 31, avoids bouncing when closing the fuel injection valve 1. A detailed illustration of the clamping sleeve 31 can be seen in FIGS. 2A and 2B.

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 durch ein Filterelement 25 gefiltert wird, zur Abspritzöffnung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Verteilerleitung abgedichtet.In the valve needle guide 14, the armature 20 and the valve seat body 5 run fuel channels 30a to 30c, which conduct the fuel, which is supplied via a central fuel supply 16 and filtered by a filter element 25, to the injection opening 7. The fuel injection valve 1 is sealed by a seal 28 against a distribution line, not shown.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Mitnehmerflansch 21 an der Ventilnadel 3 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Der Anker 20 liegt auf dem Zwischenring 32 auf, der sich auf der Klemmhülse 31 abstützt. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt. Der Hub des Ankers 20 ist dabei in einen Vorhub, der zum Schließen eines Vorhubspalts 38 dient, und einen Öffnungshub, der durch einen in der Ruhestellung zwischen dem Innenpol 13 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist, aufgeteilt. Nach Durchlaufen des Vorhubs nimmt der Anker 20 den Mitnehmerflansch 21, welcher mit der Ventilnadel 3 verschweißt ist, und damit die Ventilnadel 3 ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, wodurch der über die Brennstoffkanäle 30a bis 30c zur Abspritzöffnung 7 geführte Brennstoff abgespritzt wird.In the idle state of the fuel injection valve 1, the Mitnehmerflansch 21 is acted upon the valve needle 3 by the return spring 23 against its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. The armature 20 rests on the intermediate ring 32, which is supported on the clamping sleeve 31. Upon excitation of the magnetic coil 10, this 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 of the armature 20 is divided into a forward stroke, which serves to close a Vorhubspalts 38, and an opening stroke, which is determined by a in the rest position between the inner pole 13 and the armature 20 working gap 27. After passing through the forward stroke of the armature 20 takes the Mitnehmerflansch 21, which is welded to the valve needle 3, and thus the valve needle 3 also in the stroke direction with. The valve closing body 4, which is in operative connection with the valve needle 3, lifts off from the valve seat surface 6, as a result of which the fuel guided via the fuel channels 30a to 30c to the injection opening 7 is hosed down.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 auf den Mitnehmerflansch 21 vom Innenpol 13 ab, wodurch sich die Ventilnadel 3 entgegen der Hubrichtung bewegt. Dadurch setzt der Ventilschließkörper 4 auf der Ventilsitzfläche 6 auf, und das Brennstoffeinspritzventil 1 wird geschlossen. Der Anker 20 setzt auf der Klemmhülse 31 bzw. auf dem Zwischenring 32 auf.If the coil current is turned off, the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 on the Mitnehmerflansch 21 from the inner pole 13, whereby the valve needle 3 moves against the stroke direction. As a result, the valve closing body 4 is seated on the valve seat surface 6, and the fuel injection valve 1 is closed. The armature 20 is seated on the clamping sleeve 31 or on the intermediate ring 32.

Fig. 2A zeigt in einer auszugsweisen Schnittdarstellung den in Fig. 1 mit IIA bezeichneten Ausschnitt aus dem erfindungsgemäß ausgestalteten Brennstoffeinspritzventil 1. Übereinstimmende Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.FIG. 2A shows an excerpt from the section IIA in FIG Inventive designed fuel injector 1. Matching components are provided in all figures with matching reference numerals.

Wie bereits in Fig. 1 angesprochen, wird der untere Ankeranschlag durch die auf die Ventilnadel 3 aufgeschobene Klemmhülse 31 bzw. den Zwischenring 32 gebildet. Der Zwischenring 32 dient dabei einerseits zum Ausgleich von Ungenauigkeiten der Oberfläche eines zulaufseitigen Endes 34 der Klemmhülse 31, andererseits aber auch als Dämpfer gegen Ankerpreller beim Schließen des Brennstoffeinspritzventils 1. Prallt nämlich der Anker 20 beim Schließen an das zulaufseitige Ende 34 der Klemmhülse 31, könnte es durch die Bewegungsumkehr des Ankers 20 ermangels Dämpfung zu einem weiteren, unerwünschten kurzzeitigen Öffnungshub kommen.As already mentioned in FIG. 1, the lower anchor stop is formed by the clamping sleeve 31 or the intermediate ring 32 pushed onto the valve needle 3. The intermediate ring 32 serves on the one hand to compensate for inaccuracies in the surface of an inlet end 34 of the clamping sleeve 31, on the other hand as a damper against Ankerpreller when closing the fuel injector 1. Bounces namely the armature 20 when closing at the inlet end 34 of the clamping sleeve 31, could it comes through the reversal of movement of the armature 20 lack of damping to another, unwanted short-term opening stroke.

In dem Spalt 38 kann eine Tellerfeder 39 vorgesehen sein, um den Anker 20 im unbestromten Zustand gegen den Zwischenring 32 zu drücken.In the gap 38, a plate spring 39 may be provided to press the armature 20 in the de-energized state against the intermediate ring 32.

Die Klemmhülse 31 ist so beschaffen, daß eine beschädigungsfreie Montage auf der Ventilnadel 3 möglich ist. Zu diesem Zweck weist die Klemmhülse 31 an ihrem zulaufseitigen Ende 34 wie auch an einem ablaufseitigen Ende 35 an einer radial inneren Wandung 36 Abschrägungen 37 bzw. Fasen auf, die beispielsweise keilförmig, konisch ausgebildet sind und verhindern, daß bei der Montage der Klemmhülse 31 Materialabspanungen mit nachfolgender Verschmutzung des Ventilinnenraums und Fehlfunktionen des Brennstoffeinspritzventils 1 durch Verstopfen der Brennstoffkanäle 30b und 30c oder der Abspritzöffnung 7 auftreten.The clamping sleeve 31 is such that a damage-free mounting on the valve needle 3 is possible. For this purpose, the clamping sleeve 31 at its inflow-side end 34 as well as at a drain-side end 35 on a radially inner wall 36 bevels 37 and chamfers, which are for example wedge-shaped, conical and prevent 31 during the assembly of the clamping sleeve Materialabspan with subsequent contamination of the valve interior and malfunction of the fuel injection valve 1 by clogging of the fuel channels 30b and 30c or the injection port 7 occur.

Die Klemmhülse 31 muß so an der Ventilnadel 3 fixiert sein, daß sie der Anschlagkraft aufgrund der trägen Masse des Ankers 20 widerstehen kann. Die Klemmkraft kann dabei bedingt durch die geschlitzte Form der Klemmhülse 31 über die axiale Länge der Klemmhülse 31 beliebig angepaßt werden, da die Reibungskräfte zwischen der Ventilnadel 3 und der inneren Wandung 36 der Klemmhülse 31 von der Größe der gemeinsamen Kontaktfläche abhängt.The clamping sleeve 31 must be fixed to the valve needle 3 so that it can withstand the impact force due to the inertial mass of the armature 20. The clamping force can be adjusted as required by the slotted shape of the clamping sleeve 31 over the axial length of the clamping sleeve 31, since the frictional forces between the valve needle 3 and the inner wall 36 of the clamping sleeve 31 depends on the size of the common contact surface.

Eine besonders gute Feineinstellung ist dabei möglich, wenn die Klemmhülse 31 aus einer Legierung weicher Metalle, beispielsweise einer Kupfer-Zinn-Legierung, hergestellt ist. Eine mögliche derartige Lieferung wäre z. B. CuSn6.A particularly good fine adjustment is possible when the clamping sleeve 31 is made of an alloy of soft metals, such as a copper-tin alloy. A possible such delivery would be z. B. CuSn 6 .

Fig. 2B zeigt einen Schnitt durch den in Fig. 2A dargestellten Ausschnitt aus dem erfindungsgemäß ausgestalteten Brennstoffeinspritzventil 1 entlang der Linie IIB-IIB.FIG. 2B shows a section through the detail shown in FIG. 2A from the fuel injection valve 1 designed according to the invention along the line IIB-IIB.

Wie bereits weiter oben angesprochen, weist die Klemmhülse 31 einen Schlitz 33 auf, der dafür sorgt, daß die Klemmhülse 31 einerseits leicht und beschädigungsfrei auf die Ventilnadel 3 aufschiebbar ist, und der andererseits durch die entstehende Vorspannung für eine zuverlässige Fixierung der Klemmhülse 31 in der jeweils gewählten Position an der Ventilnadel 3 sorgt. Damit kann die Position der Klemmhülse 31 und damit die Höhe des Vorhubspalts 38 problemlos justiert werden.As already mentioned above, the clamping sleeve 31 has a slot 33 which ensures that the clamping sleeve 31 on the one hand easily and without damage to the valve needle 3 can be pushed, and on the other hand by the resulting bias for a reliable fixation of the clamping sleeve 31 in the each selected position on the valve needle 3 provides. Thus, the position of the clamping sleeve 31 and thus the height of the Vorhubspalts 38 can be easily adjusted.

Die Aufsicht auf das zulaufseitige Ende 34 der Klemmhülse 31 zeigt nochmals die Abschrägung oder Fase 37, die im vorliegenden Ausführungsbeispiel keilförmig, konisch ausgebildet ist und sich über den gesamten Umfang der Klemmhülse 31 außerhalb des Schlitzes 33 erstreckt.The plan view of the inlet-side end 34 of the clamping sleeve 31 again shows the chamfer or bevel 37, which is wedge-shaped, conical in the present embodiment and extends over the entire circumference of the clamping sleeve 31 outside of the slot 33.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und auch für andere Formen von Ankern 20, beispielsweise für Tauch- und Flachanker, sowie beliebige Bauweisen von Brennstoffeinspritzventilen 1 anwendbar.The invention is not limited to the illustrated embodiment and also for other forms of anchors 20, for example, for immersion and flat anchors, as well as any designs of fuel injectors 1 applicable.

Claims (8)

  1. Fuel injection valve (1), in particular for directly injecting fuel into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine, having an armature (20) which interacts with a solenoid (10), and a valve needle (3) which is operatively connected to the armature (20) and on which a valve-closing body (4) which forms a sealing seat together with a valve-seat face (6) is provided, an armature stop being provided downstream of the armature (20) on the valve needle (3), characterized in that the armature stop is embodied as a clamping sleeve (31) with a slot (33) which extends in the axial direction, the adjustable axial position of the clamping sleeve (31) on the valve needle (3) determining the height of a pre-stroke gap (38) which is formed between the armature (20) and a second armature stop (21) on the valve needle (3).
  2. Fuel injection valve according to Claim 1, characterized in that the clamping sleeve (31) can be pushed onto the valve needle (3).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that an intermediate ring (32) is arranged between the clamping sleeve (31) and the armature (20).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the clamping sleeve (31) has bevels (37) at an inflow end (34) and/or at an outflow end (35) on a radially inner wall (36).
  5. Fuel injection valve according to Claim 4, characterized in that the bevels (37) are of conical design.
  6. Fuel injection valve according to one of Claims 1 to 5, characterized in that an axial length of the clamping sleeve (31) is dimensioned in such a way that a clamping force which results from the axial length is greater than or equal to a stop force which acts as a result of the inert mass of the armature (20).
  7. Fuel injection valve according to one of Claims 1 to 6, characterized in that the clamping sleeve (31) is composed of a copper-tin alloy.
  8. Fuel injection valve according to one of the preceding claims, characterized in that the second armature stop is formed upstream of the armature (20) as a driver flange (21) which is connected to the valve needle (3) in a frictionally locking and materially joined fashion.
EP02717971A 2001-02-24 2002-02-25 Fuel injection valve Expired - Lifetime EP1364117B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10108974 2001-02-24
DE10108974A DE10108974A1 (en) 2001-02-24 2001-02-24 Fuel injector
PCT/DE2002/000662 WO2002068811A1 (en) 2001-02-24 2002-02-25 Fuel injection valve

Publications (2)

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EP1364117A1 EP1364117A1 (en) 2003-11-26
EP1364117B1 true EP1364117B1 (en) 2006-08-09

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EP02717971A Expired - Lifetime EP1364117B1 (en) 2001-02-24 2002-02-25 Fuel injection valve

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US (1) US6742726B2 (en)
EP (1) EP1364117B1 (en)
JP (1) JP2004518859A (en)
BR (1) BR0204226A (en)
CZ (1) CZ20023493A3 (en)
DE (2) DE10108974A1 (en)
WO (1) WO2002068811A1 (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10256948A1 (en) * 2002-12-05 2004-06-24 Robert Bosch Gmbh Fuel injector
DE10345967B4 (en) * 2003-10-02 2014-02-27 Robert Bosch Gmbh Fuel injector
DE102005017267A1 (en) * 2005-04-14 2006-10-19 Robert Bosch Gmbh Pre-assembled anchor group for common rail injector
US20080295806A1 (en) * 2007-06-04 2008-12-04 Caterpillar Inc. Heat conducting sleeve for a fuel injector
US7946276B2 (en) * 2008-03-31 2011-05-24 Caterpillar Inc. Protection device for a solenoid operated valve assembly
JP4637930B2 (en) 2008-05-22 2011-02-23 三菱電機株式会社 Fuel injection valve
US20100038458A1 (en) * 2008-08-12 2010-02-18 Bircann Raul A Fuel injector having an energy attenuator sub-assembly for the valve seat
EP2336544A1 (en) * 2009-12-14 2011-06-22 Delphi Technologies, Inc. Anti-bounce mechanism for fuel injectors
JP5488120B2 (en) * 2010-03-30 2014-05-14 株式会社デンソー Fuel injection valve
US8556194B2 (en) * 2010-06-23 2013-10-15 Delphi Technologies, Inc. Fuel injector
JP5939667B2 (en) 2012-02-24 2016-06-22 株式会社ケーヒン Electromagnetic fuel injection valve
DE102012210415A1 (en) * 2012-06-20 2013-12-24 Robert Bosch Gmbh Injector
DE102012217322A1 (en) * 2012-09-25 2014-06-12 Robert Bosch Gmbh Injector
EP2860386A1 (en) * 2013-10-10 2015-04-15 Continental Automotive GmbH Injector for a combustion engine
EP2949917B1 (en) * 2014-05-27 2017-01-04 Continental Automotive GmbH Fuel injector
EP2985445A1 (en) * 2014-08-14 2016-02-17 Continental Automotive GmbH Solenoid actuated fluid injection valve
EP3156638B1 (en) * 2015-10-14 2020-03-18 Vitesco Technologies GmbH Fuel injector
DE102017207270A1 (en) * 2016-06-30 2018-01-04 Robert Bosch Gmbh Valve for metering a fluid
DE102017218764A1 (en) * 2017-10-20 2019-04-25 Robert Bosch Gmbh Solenoid valve for controlling fluids
DE102018200364A1 (en) * 2018-01-11 2019-07-11 Robert Bosch Gmbh Valve for metering a fluid
DE102018201951A1 (en) * 2018-02-08 2019-08-08 Robert Bosch Gmbh Valve for metering a fluid
DE102019201087A1 (en) * 2019-01-29 2020-07-30 Robert Bosch Gmbh Valve for metering a fluid and fuel injection system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1541458A (en) 1966-10-20 1968-10-04 Bosch Gmbh Robert Electromagnetically actuated fuel injection valve for internal combustion engines
US4342427A (en) * 1980-07-21 1982-08-03 General Motors Corporation Electromagnetic fuel injector
DE3814765A1 (en) * 1988-04-30 1989-11-09 Messerschmitt Boelkow Blohm MAGNETIC VALVE
DE19708104A1 (en) 1997-02-28 1998-09-03 Bosch Gmbh Robert magnetic valve
IT1296144B1 (en) * 1997-11-18 1999-06-09 Elasis Sistema Ricerca Fiat ADJUSTABLE DOSING VALVE FOR ONE FUEL INJECTOR FOR INTERNAL COMBUSTION ENGINES.
DE19816315A1 (en) * 1998-04-11 1999-10-14 Bosch Gmbh Robert Fuel injector
DE19849210A1 (en) * 1998-10-26 2000-04-27 Bosch Gmbh Robert Fuel injection valve for internal combustion engine fuel injection system has armature movable between two stops, damping spring arranged between second stop and armature
DE19853091A1 (en) * 1998-11-18 2000-05-25 Bosch Gmbh Robert Fuel injector
DE19855547A1 (en) * 1998-12-02 2000-06-08 Bosch Gmbh Robert Electromagnetically actuated valve
DE19927900A1 (en) * 1999-06-18 2000-12-21 Bosch Gmbh Robert Fuel injection valve for direct injection IC engine has movement of armature limited by opposing stops attached to valve needle one of which is provided by spring element

Also Published As

Publication number Publication date
DE50207789D1 (en) 2006-09-21
EP1364117A1 (en) 2003-11-26
DE10108974A1 (en) 2002-09-05
US6742726B2 (en) 2004-06-01
BR0204226A (en) 2003-02-18
JP2004518859A (en) 2004-06-24
WO2002068811A1 (en) 2002-09-06
CZ20023493A3 (en) 2004-05-12
US20030155440A1 (en) 2003-08-21

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