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EP1330602A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1330602A1
EP1330602A1 EP01988821A EP01988821A EP1330602A1 EP 1330602 A1 EP1330602 A1 EP 1330602A1 EP 01988821 A EP01988821 A EP 01988821A EP 01988821 A EP01988821 A EP 01988821A EP 1330602 A1 EP1330602 A1 EP 1330602A1
Authority
EP
European Patent Office
Prior art keywords
valve
closing body
valve closing
valve needle
fuel
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.)
Withdrawn
Application number
EP01988821A
Other languages
German (de)
French (fr)
Inventor
Norbert Keim
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 EP1330602A1 publication Critical patent/EP1330602A1/en
Withdrawn legal-status Critical Current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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/042—The valves being provided with fuel passages
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • 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
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the invention relates to a fuel injector according to the type of the main claim.
  • Fuel injectors in which the fuel is supplied to the sealing seat inside the valve closing body are, for. B. from DE 40 18 256 AI known. They have a valve closing body which is connected to the armature of the electromagnetically actuated injection valve and which is held by a spring in sealing contact with a seat surface which is arranged in a valve seat body.
  • the valve closing body has a central recess, which is connected to a recess of the armature.
  • the amount of fuel to be sprayed is measured via the cross section of the swirl channels, which are designed as bores.
  • a fuel injector is also known, in which the flow guide is laid inside a hollow valve needle.
  • the valve needle has a blind hole as the central recess, at the downstream end of which the swirl channels are arranged.
  • the metering of the amount of fuel to be sprayed off again takes place via the cross section of the swirl channels, which can have a tangential component for generating a swirl.
  • the fuel emerging from the swirl channels when the fuel injection valve is open has a peripheral speed and is sprayed onto a conical jacket.
  • a disadvantage of both fuel injection valves specified is the design of the swirl channels as bores, as a result of which a subsequent correction with respect to the metered quantity of fuel is not possible.
  • precise drilling of the holes is necessary, which increases the manufacturing costs.
  • a check of the cross-sectional area of the swirl ducts is also necessary in order to be able to ensure that the quantity of fuel to be sprayed off corresponds to the specification when the fuel injector is fully assembled.
  • the fuel injector according to the invention has the advantage that the swirl channels are introduced as slots in the valve closing body. As a result, the additional central supply of fuel inside the valve closing body can be dispensed with. Furthermore, after the valve needle has been welded to the valve closing body, a correction of the set metered quantity of fuel is possible.
  • the free flow cross section can be varied by plastically deforming the weld seam. The resulting lower reject rate lowers manufacturing costs.
  • Figure 1 is a schematic partial section through an embodiment of a fuel injector according to the invention.
  • Fig. 2 is a schematic partial section in section II of Fig. 1 by the embodiment of a fuel injector according to the invention and
  • the fuel injector 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited
  • the fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged, which is hollow at least at its downstream end. At least one opening 39 is made in the wall of the valve needle 3, which is sleeve-shaped in this area, so that the cavity of the valve needle 3 can fill with fuel. At the downstream end, the valve needle 3 is connected at a connecting line 43, preferably by a weld 41, to a spherical 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 an electromagnetically actuated fuel injector 1, which has a spray opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer housing 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 housing 9 are separated from one another by a gap 26 and are supported on one Connecting component 29 from.
  • 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 disk-shaped valve needle guide 14, which is arranged downstream of the armature 20.
  • a disk-shaped valve needle guide 14 For adjusting the stroke, one of the valve needle guide 14 paired adjusting disk 15 is used.
  • the armature 20 is non-positively connected to the valve needle 3 via a flange 21, for. B. on a weld.
  • a restoring spring 23 is supported on the flange 21, which, in the present design of the fuel injector 1, is pretensioned at its upstream end by a sleeve 24 pressed into the inner pole 13.
  • Fuel channels 30a, 30b run in the valve needle guide 14 and in the armature 20.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. Via the openings 39, the fuel is guided into the inner volume 42 of the valve needle 3 to the swirl channels 36.
  • the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
  • the fuel injector 1 When the solenoid 10 is not energized, the fuel injector 1 is in the idle state and the armature 20 is acted on by the return spring 23 against the stroke direction via the flange 21 on the valve needle 3 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6 the valve closing body 4 is in its downstream stroke-limiting end position. If 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 armature 20 takes the flange 21, which is welded to the valve needle 3, and thus the Valve needle 3 also in the stroke direction.
  • the valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, and the fuel flows through the swirl channels 36 into a swirl chamber 37, from where it reaches the spray opening 7 and is sprayed onto a conical jacket.
  • Fig. 2 shows the swirl-generating assembly of the embodiment of the invention
  • valve needle 3 which is of sleeve-shaped design at least in its downstream area, is welded to the connecting line 43 by means of a weld seam 41 with a preferably spherical valve closing body 4.
  • the valve closing body 4 is guided axially through a recess 38 which is introduced into the valve seat body 5.
  • the swirl channels 36 are e.g. B. through a grinding wheel as slots 44 with a part-circular contour, which are open to the spherical surface of the valve closing body 4, introduced into the valve closing body 4.
  • the connecting line 43 of the valve needle 3 with the valve closing body 4 cuts the slot-shaped swirl channels 36 which have been introduced.
  • the slots 44 are divided into an opening part and an opening part.
  • the inlet opening 36a thus formed is arranged in the inner volume 42 of the sleeve-shaped valve needle 3, the outlet opening 36b, on the other hand, is arranged upstream of the sealing seat and preferably opens into a swirl chamber 37 Applied peripheral speed, which leads to better atomization of the sprayed fuel.
  • the fuel located in the inner volume 42 of the sleeve-shaped part of the valve needle 3 flows through the inlet opening 36a into the swirl duct 36.
  • the distance D can be varied, which leads to a change in the rectangular area F to be flowed through, and thus ultimately to a change in the amount of fuel to be sprayed off.
  • the connection of valve closing body 4 and valve needle 3 are plastically deformed. This can also take place in the fuel injector 1 which is already fully assembled.
  • a material-locking method such as welding is preferably used as the connection technique.
  • Fig. 3 shows a section through the sleeve-shaped valve needle 3 and the valve closing body 4 of an embodiment according to the invention.
  • four swirl channels 36 are arranged uniformly in the valve closing body 4 and have identical cross sections.
  • the swirl channels 36 can differ both with regard to the position with respect to the valve closing body and with regard to the cross section.

Landscapes

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

Abstract

A fuel injection valve (1) for the fuel injection systems of internal combustion engines, comprising a valve seat body (5) having a valve seat surface (6) which cooperates with a spherical or partially spherical valve closing body (4) associated with a valve seat, and a sleeve-type valve needle (3) which is connected to the valve closing body (4) on a connection line (43) and whose inner volume (42) is connected to spiral channels (36) embodied inside the valve closing body (4) which subsequently produce a swirl downstream from the sealing seat with a tangential portion. The spiral channels (36) are inserted into the valve closing body (4) as slots (44). The connection line (43) of the valve closing body (4) with the sleeve-like valve needle intersects the slots (44) in such a way that the inlet (36a) of the spiral channels (36) is disposed inside the sleeve-like valve needle (3) and the outlet (36b) of the spiral channels (36) is arranged outside the sleeve-type valve needle (3).

Description

Brennstoffeinspritzventil Fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach Gattung des Hauptanspruchs .The invention relates to a fuel injector according to the type of the main claim.
Brennstoffeinspritzventile, bei denen die Zuführung des Brennstoffes zu dem Dichtsitz im Inneren des Ventilschließkörpers erfolgt, sind z. B. aus der DE 40 18 256 AI bekannt. Sie weisen einen Ventilschließkörper auf, der mit dem Anker des - elektromagnetisch betätigten Ξinspritzventils verbunden ist und der durch eine Feder in dichtender Anlage mit einer Veήtilsitzflache gehalten wird, welche in einem Ventilsitzkörper angeordnet ist. Der Ventilschließkörper besitzt eine zentrale Ausnehmung, die mit einer Ausnehmung des Ankers in Verbindung steht. Bei geöffnetem Brennstoffeinspritzventil strömt der Brennstoff- in die stromabwärts der zentralen Ausnehmung angeordneten Drallkanäle, die zur Erzeugung eines Dralls eine Tangentialkomponente aufweisen. Die stromabwärtige Seite der Drallkanäle mündet in eine Drallkammer aus, die sich stromaufwärts des Dichtsitzes befindet. Die Zu essung der abzuspritzenden Brennstof menge erfolgt über den Querschnitt der Drallkanale, die als Bohrungen ausgeführt sind. Aus der DE 36 24 477 AI ist weiterhin ein Brennstoffeinspritzventil bekannt, bei dem die Strömungsführung in das Innere einer hohl ausgeführten Ventilnadel verlegt ist. Die Ventilnadel weist als zentrale Ausnehmung ein Sackloch auf, an dessen stromabwärtigem Ende die Drallkanäle angeordnet sind. Die Zumessung der abzuspritzenden Brennstoffmenge erfolgt dabei wiederum über den Querschnitt der Drallkanäle, die zur Erzeugung eines Dralls eine Tangentialkomponente aufweisen können. Der bei geöffnetem Brennstoffeinspritzventil aus den Drallkanälen austretende Brennstoff weist eine Umfangsgeschwindigkeit auf und wird auf einen Kegelmantel abgespritzt.Fuel injectors in which the fuel is supplied to the sealing seat inside the valve closing body are, for. B. from DE 40 18 256 AI known. They have a valve closing body which is connected to the armature of the electromagnetically actuated injection valve and which is held by a spring in sealing contact with a seat surface which is arranged in a valve seat body. The valve closing body has a central recess, which is connected to a recess of the armature. When the fuel injection valve is open, the fuel flows into the swirl channels which are arranged downstream of the central recess and which have a tangential component for generating a swirl. The downstream side of the swirl channels opens into a swirl chamber, which is located upstream of the sealing seat. The amount of fuel to be sprayed is measured via the cross section of the swirl channels, which are designed as bores. From DE 36 24 477 AI a fuel injector is also known, in which the flow guide is laid inside a hollow valve needle. The valve needle has a blind hole as the central recess, at the downstream end of which the swirl channels are arranged. The metering of the amount of fuel to be sprayed off again takes place via the cross section of the swirl channels, which can have a tangential component for generating a swirl. The fuel emerging from the swirl channels when the fuel injection valve is open has a peripheral speed and is sprayed onto a conical jacket.
Nachteilig bei beiden angegebenen Brennstoffeinspritzventilen ist die Ausführung der Drallkanäle als Bohrungen, wodurch eine nachträgliche Korrektur bezüglich der Zumeßmenge Brennstoff nicht möglich ist. Zur Einhaltung exakt definierter Zumeßmengen ist daher ein präzises Einbringen der Bohrungen nötig, wodurch sich die Herstellkosten erhöhen. Als zusätzlicher Arbeitsschritt ist außerdem eine Überprüfung der Querschnittsfläche der Drallkanäle erforderlich, um sicherstellen zu können, daß die abzuspritzende Brennstoffmenge bei fertig montiertem Brennstoffeinspritzventil mit den Vorgabe übereinstimmt.A disadvantage of both fuel injection valves specified is the design of the swirl channels as bores, as a result of which a subsequent correction with respect to the metered quantity of fuel is not possible. In order to maintain precisely defined metering quantities, precise drilling of the holes is necessary, which increases the manufacturing costs. As an additional step, a check of the cross-sectional area of the swirl ducts is also necessary in order to be able to ensure that the quantity of fuel to be sprayed off corresponds to the specification when the fuel injector is fully assembled.
Weiterhin nachteilig bei dem aus der DE 36 24 477 AI bekannten Brennstoffeinspritzventil ist die aufwendige Fertigung der Ventilnadel . Um ein präzises Einbringen des Sacklochs über fast die gesamte Länge der Ventilnadel sicherzustellen, sind hohe Anforderungen an das Werkzeug nötig. Die damit verbundenen Werkzeugmehrkosten erhöhen sich und die Fertigung des gesamten Brennstoffeinspritzventil verteuert sich. Vorteile der ErfindungAnother disadvantage of the fuel injector known from DE 36 24 477 AI is the complex manufacture of the valve needle. In order to ensure a precise insertion of the blind hole over almost the entire length of the valve needle, high demands are placed on the tool. The associated additional tool costs increase and the production of the entire fuel injector becomes more expensive. Advantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil hat demgegenüber den Vorteil, daß die Drallkanäle als Schlitze in den Ventilschließkörper eingebracht sind. Dadurch kann auf die zusätzliche zentrale Zuführung des Brennstoffs im Inneren des Ventilschließkörpers verzichtet werden. Ferner ist nach dem Verschweißen der Ventilnadel mit dem Ventilschließkörper eine Korrektur der eingestellten Zumeßmenge an Brennstoff möglich. Der freie Strömungsquerschnitt kann durch plastisches Verformen der Schweißnaht variiert werden. Die dadurch bedingte geringere Ausschußquote senkt die Kosten in der Fertigung.The fuel injector according to the invention has the advantage that the swirl channels are introduced as slots in the valve closing body. As a result, the additional central supply of fuel inside the valve closing body can be dispensed with. Furthermore, after the valve needle has been welded to the valve closing body, a correction of the set metered quantity of fuel is possible. The free flow cross section can be varied by plastically deforming the weld seam. The resulting lower reject rate lowers manufacturing costs.
Weiterhin vorteilhaft ist, daß bei einer hohen Anzahl an Gleichteilen eine Variantenbildung des Brennstoffeinspritzventils leicht möglich ist. So kann zum Einstellen einer neuen Zumeßmenge bei identischen Bauteilen eine Verformung der Schweißnaht zur Erzeugung einer neuen Variante genutzt werden.It is also advantageous that with a large number of identical parts, a variant formation of the fuel injector is easily possible. For example, to set a new metering quantity for identical components, a deformation of the weld seam can be used to create a new variant.
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 Teilschnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils;Figure 1 is a schematic partial section through an embodiment of a fuel injector according to the invention.
Fig. 2 einen schematischen Teilschnitt im Ausschnitt II der Fig. 1 durch das Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils undFig. 2 is a schematic partial section in section II of Fig. 1 by the embodiment of a fuel injector according to the invention and
Fig. 3 einen schematischen Schnitt entlang der Linie III-III in Fig. 2. Beschreibung des Ausführungsbeispiels3 shows a schematic section along the line III-III in FIG. 2. Description of the embodiment
Bevor anhand der Figuren 2 und 3 ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1 näher beschrieben werden, soll zum besseren Verständnis der Erfindung zunächst anhand von Fig. 1 das erfindungsgemäße Brennstoffeinspritzventil 1 in einer Gesamtdarstellung bezüglich seiner wesentlichen Bauteile kurz erläutert werden.Before an exemplary embodiment of a fuel injector 1 according to the invention is described in more detail with reference to FIGS. 2 and 3, the fuel injector 1 according to the invention is first to be briefly explained in an overall view with regard to its essential components for a better understanding of the invention.
Das Brennstoffeinspritzventil 1 ist in Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündetenThe fuel injector 1 is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited
Brennkraftmaschinen ausgeführt . Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.Running internal combustion engines. The fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist, die zumindest an ihrem stromabwärtigen Ende hohl ausgeführt ist. In die Wandung der in diesem Bereich hulsenformigen Ventilnadel 3 ist zumindest eine Öffnung 39 eingebracht, so daß sich der Hohlraum der Ventilnadel 3 mit Brennstoff füllen kann. Am stromabwärtigen Ende ist die Ventilnadel 3 an einer Verbindungslinie 43 vorzugsweise durch eine Schweißnaht 41 mit einem kugelförmigen Ventilschließkörper 4 verbunden, welcher mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Im Ausführungsbeispiel handelt es sich bei dem Brennstoffeinspritzventil 1 um ein elektromagnetisch betätigtes Brennstoffeinspritzventil 1, welches über eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen ein äußeres Gehäuse 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 das Gehäuse 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 arranged, which is hollow at least at its downstream end. At least one opening 39 is made in the wall of the valve needle 3, which is sleeve-shaped in this area, so that the cavity of the valve needle 3 can fill with fuel. At the downstream end, the valve needle 3 is connected at a connecting line 43, preferably by a weld 41, to a spherical 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 an electromagnetically actuated fuel injector 1, which has a spray opening 7. The nozzle body 2 is sealed by a seal 8 against an outer housing 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 housing 9 are separated from one another by a gap 26 and are supported on one Connecting component 29 from. 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 scheibenförmig ausgeführten Ventilnadelführung 14 geführt, welche stromabwärts des Ankers 20 angeordnet ist. Zur Hubeinstellung dient eine der Ventilnadelführung 14 zugepaarte Einstellscheibe 15. Der Anker 20 steht mit der Ventilnadel 3 über einen Flansch 21 kraftschlüssig in Verbindung, z. B. über eine Schweißnaht.- Auf dem Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche bei der vorliegenden Bauform des Brennstoffeinspritzventils 1 an ihrem stromaufwärtigem Ende durch eine in den Innenpol 13 eingepreßte Hülse 24 auf Vorspannung gebracht wird.The valve needle 3 is guided in a disk-shaped valve needle guide 14, which is arranged downstream of the armature 20. For adjusting the stroke, one of the valve needle guide 14 paired adjusting disk 15 is used. The armature 20 is non-positively connected to the valve needle 3 via a flange 21, for. B. on a weld. - A restoring spring 23 is supported on the flange 21, which, in the present design of the fuel injector 1, is pretensioned at its upstream end by a sleeve 24 pressed into the inner pole 13.
In der Ventilnadelführung 14 und in dem Anker 20 verlaufen Brennstoffkanäle 30a, 30b. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Über die Öffnungen 39 wird der Brennstoff in das innere Volumen 42 der Ventilnadel 3 zu den Drallkanälen 36 geführt. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht dargestellte Verteilerleitung abgedichtet.Fuel channels 30a, 30b run in the valve needle guide 14 and in the armature 20. The fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. Via the openings 39, the fuel is guided into the inner volume 42 of the valve needle 3 to the swirl channels 36. The fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
Bei nicht erregter Magnetspule 10 befindet sich das Brennstoffeinspritzventil 1 im Ruhezustand und der Anker 20 wird über den Flansch 21 an der Ventilnadel 3 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 an der Ventilsitzfläche 6 in dichtender Anlage gehalten wird und sich der Ventilschließkδrper 4 in seiner stromabwärtig hubbegrenzenden Endposition befindet. Wird die Magnetspule 10 erregt, baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt. Der Anker 20 nimmt den Flansch 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, und der Brennstoff durchströmt die Drallkanäle 36 in eine Drallkammer 37, von wo aus er zu der Abspritzöffnung 7 gelangt und auf einen Kegelmantel abgespritzt wird.When the solenoid 10 is not energized, the fuel injector 1 is in the idle state and the armature 20 is acted on by the return spring 23 against the stroke direction via the flange 21 on the valve needle 3 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6 the valve closing body 4 is in its downstream stroke-limiting end position. If 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 armature 20 takes the flange 21, which is welded to the valve needle 3, and thus the Valve needle 3 also in the stroke direction. The valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, and the fuel flows through the swirl channels 36 into a swirl chamber 37, from where it reaches the spray opening 7 and is sprayed onto a conical jacket.
Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch die Kraft der Rückstellfeder 23 auf den Flansch 21 von 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.If the coil current is switched off, the armature 20 drops from the inner pole 13 after the magnetic field is sufficiently reduced by the force of the return spring 23 onto the flange 21, as a result of which the valve needle 3 moves counter to the stroke direction. As a result, the valve closing body 4 rests on the valve seat surface 6 and the fuel injection valve 1 is closed.
Fig. 2 zeigt die drallerzeugende Baugruppe des Ausführungsbeispiels des erfindungsgemäßenFig. 2 shows the swirl-generating assembly of the embodiment of the invention
Brennstoffeinspritzventils 1. Die zumindest in ihrem stromabwärtigen Bereich hülsenförmig ausgeführte Ventilnadel 3 ist an der Verbindungslinie 43 mittels einer Schweißnaht 41 mit einem vorzugsweise kugelförmigen Ventilschließkόrper 4 verschweißt. Der Ventilschließkörper 4 wird axial durch eine Ausnehmung 38, die in den Ventilsitzkörper 5 eingebracht ist, geführt.Fuel injection valve 1. The valve needle 3, which is of sleeve-shaped design at least in its downstream area, is welded to the connecting line 43 by means of a weld seam 41 with a preferably spherical valve closing body 4. The valve closing body 4 is guided axially through a recess 38 which is introduced into the valve seat body 5.
Die Drallkanäle 36 werden z. B. durch eine Schleifscheibe als Schlitze 44 mit teilkreisförmiger Kontur, die zu der kugelförmigen Oberfläche des Ventilschließkörpers 4 hin offen sind, in den Ventilschließkόrper 4 eingebracht. Die Verbindungslinie 43 der Ventilnadel 3 mit dem Ventilschließkörper 4 schneidet die eingebrachten schlitzförmigen Drallkanäle 36. Dadurch werden die Schlitze 44 in einen einmündenden Teil und einen ausmündenden Teil unterteilt. Die so gebildete Einlaßöffnung 36a ist im inneren Volumen 42 der hulsenformigen Ventilnadel 3 angeordnet, die Auslaßöffnung 36b hingegen ist stromaufwärts des Dichtsitzes angeordnet und mündet vorzugsweise in eine Drallkammer 37. Die Ausmündung der Drallkanäle 36 weist eine Tangentialkomponente auf, die den Brennstoff mit einer Umfangsgeschwindigkeit beaufschlagt, der zu einer besseren Zerstäubung des abgespritzten Brennstoffs führt.The swirl channels 36 are e.g. B. through a grinding wheel as slots 44 with a part-circular contour, which are open to the spherical surface of the valve closing body 4, introduced into the valve closing body 4. The connecting line 43 of the valve needle 3 with the valve closing body 4 cuts the slot-shaped swirl channels 36 which have been introduced. As a result, the slots 44 are divided into an opening part and an opening part. The inlet opening 36a thus formed is arranged in the inner volume 42 of the sleeve-shaped valve needle 3, the outlet opening 36b, on the other hand, is arranged upstream of the sealing seat and preferably opens into a swirl chamber 37 Applied peripheral speed, which leads to better atomization of the sprayed fuel.
Der im inneren Volumen 42 des hulsenformigen Teils der Ventilnadel 3 befindliche Brennstoff strömt bei geöffnetem Brennstoffeinspritzventil 1 durch die Einlaßöffnung 36a in den Drallkanal 36. Zur Zumessung des abzuspritzenden Brennstoffs dient ein limitierender Querschnitt an einer Drosselstelle, die der im Inneren der Drallkanäle 36 angeordnet ist. Der zu durchströmende Querschnitt ist eine näherungsweise rechteckige Fläche F=B-D, wobei B der Breite der eingebrachten Schlitze entspricht und D der mittlere Abstand des stromabwärtigen Endes der Ventilnadel 3 von dem Grund der eingebrachten Schlitze entspricht. Nach dem Durchströmen der Drosselstelle tritt der Brennstoff durch die Auslaßöffnung 6b aus dem Ventilschließkörper 3 aus, z.B. in eine Drallkammer 37, von wo aus er zu der Abspritzöffnung 7 gelangt.When the fuel injection valve 1 is open, the fuel located in the inner volume 42 of the sleeve-shaped part of the valve needle 3 flows through the inlet opening 36a into the swirl duct 36. The cross-section to be flowed through is an approximately rectangular area F = B-D, where B corresponds to the width of the slots made and D corresponds to the mean distance of the downstream end of the valve needle 3 from the bottom of the slots made. After flowing through the throttle point, the fuel exits the valve closing body 3 through the outlet opening 6b, e.g. into a swirl chamber 37, from where it reaches the spray opening 7.
Durch Veränderung der axialen Position der Ventilnadel 3 bezüglich des Ventilschließkörpers 4 kann so der Abstand D variiert werden, was zu einer Änderung der zu durchströmenden rechteckähnlichen Fläche F führt, und somit letztlich eine Änderung der abzuspritzenden Brennstoffmenge zur Folge hat. Zur Änderung der axialen Position der hulsenformigen Ventilnadel 3 in Bezug auf den Ventilschließkörper 4 kann z. B. die Verbindung von Ventilschließkörper 4 und Ventilnadel 3 plastisch verformt werden. Dies kann auch im bereits fertig montierten Brennstoffeinspritzventil 1 erfolgen. Um bei einer plastischen Verformung der Verbindung das Risiko des Lösens von Ventilschließkörper 4 von der Ventilnadel 3 klein zu halten, kommt als Verbindungstechnik vorzugsweise ein materialschlüssiges Verfahren wie beispielsweise Schweißen zum Einsatz.By changing the axial position of the valve needle 3 with respect to the valve closing body 4, the distance D can be varied, which leads to a change in the rectangular area F to be flowed through, and thus ultimately to a change in the amount of fuel to be sprayed off. To change the axial position of the sleeve-shaped valve needle 3 in relation to the valve closing body 4, for. B. the connection of valve closing body 4 and valve needle 3 are plastically deformed. This can also take place in the fuel injector 1 which is already fully assembled. In order to keep the risk of the valve closing body 4 coming loose from the valve needle 3 in the event of a plastic deformation of the connection, a material-locking method such as welding is preferably used as the connection technique.
Fig. 3 zeigt einen Schnitt durch die hülsenfδrmige Ventilnadel 3 und den Ventilschließkörper 4 eines erfindungsgemäßen Ausführungsbeispiels . Im Ausführungsbeispiel sind vier Drallkanäle 36 gleichmäßig in dem Ventilschließkorper 4 angeordnet und weisen identische Querschnitte auf. Zur Erzeugung spezieller Eigenschaften des ausgebildeten Dralls können sich die Drallkanäle 36 sowohl hinsichtlich der Lage bezüglich des Ventilschließkörpers als auch hinsichtlich des Querschnitts unterscheiden. Fig. 3 shows a section through the sleeve-shaped valve needle 3 and the valve closing body 4 of an embodiment according to the invention. in the In the exemplary embodiment, four swirl channels 36 are arranged uniformly in the valve closing body 4 and have identical cross sections. To generate special properties of the swirl formed, the swirl channels 36 can differ both with regard to the position with respect to the valve closing body and with regard to the cross section.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) für1. Fuel injector (1) for
Brennstoffeinspritzanlagen von Brennkraftmaschinen mit einem Ventilsitzkörper (5) , der eine Ventilsitzfläche (6) aufweist, die mit einem kugelförmigen oder teilkugelförmigen Ventilschließkorper (4) zu einem Dichtsitz zusammenwirkt und mit einer hulsenformigen Ventilnadel (3) , die mit dem Ventilschließkorper (4) an einer Verbindungslinie (43) verbunden ist und deren inneres Volumen (42) mit in dem Ventilschließkorper (4) ausgebildeten Drallkanälen (36) in Verbindung steht, welche stromaufwärts des Dichtsitzes ausmünden, wobei die Drallkanäle (36) zur Erzeugung eines Dralls eine Tangentialkomponente aufweisen, dadurch gekennzeichnet, daß die Drallkanäle (36) als Schlitze (44) in den Ventilschließkorper (4) eingebracht sind und die Verbindungslinie (43) des Ventilschließkörpers (4) mit der hulsenformigen Ventilnadel (3) die Schlitze (44) so schneidet, daß eine Einlaßöffnung (36a) der Drallkanäle (36) innerhalb der hulsenformigen Ventilnadel (3) und eine Auslaßöffnung (36b) der Drallkanäle (36) außerhalb der hulsenformigen Ventilnadel (3) liegt.Fuel injection systems of internal combustion engines with a valve seat body (5) which has a valve seat surface (6) which cooperates with a spherical or partially spherical valve closing body (4) to form a sealing seat and with a sleeve-shaped valve needle (3) which connects with the valve closing body (4) on one Connection line (43) is connected and its inner volume (42) is connected to swirl channels (36) formed in the valve closing body (4), which open upstream of the sealing seat, the swirl channels (36) having a tangential component for generating a swirl, thereby characterized in that the swirl channels (36) are introduced as slots (44) in the valve closing body (4) and the connecting line (43) of the valve closing body (4) with the sleeve-shaped valve needle (3) cuts the slots (44) such that an inlet opening (36a) of the swirl channels (36) within the sleeve-shaped valve needle (3) and an outlet opening ng (36b) of the swirl channels (36) lies outside the sleeve-shaped valve needle (3).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Ventilnadel (3) mit dem Ventilschließkorper (4) verschweißt ist .2. Fuel injection valve according to claim 1, characterized in that that the valve needle (3) is welded to the valve closing body (4).
3. Brennstoffeinspritzventil nach einem der Ansprüche 1 oder 2 , dadurch gekennzeichnet, daß die Zumeßmenge des abzuspritzenden Brennstoffs durch die kleinste Strömungsquerschnittsfläche auf dem Strömungsweg des Brennstoffs innerhalb der Drallkanäle (36) einstellbar ist.3. Fuel injection valve according to one of claims 1 or 2, characterized in that the metered amount of the fuel to be sprayed is adjustable through the smallest flow cross-sectional area on the flow path of the fuel within the swirl channels (36).
4. Brennstoffeinspritzventil nach Anspruch 3 dadurch gekennzeichnet, daß das stromabwärtige Ende der Ventilnadel (3) ein Teil der Umfangslinie der kleinsten Strömungsquerschnittsfläche ist.4. Fuel injection valve according to claim 3, characterized in that the downstream end of the valve needle (3) is part of the circumferential line of the smallest flow cross-sectional area.
5. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß die Zumeßmenge durch plastische Verformung der Schweißnaht (41) von Ventilnadel (3) und Ventilschließkorper (4) einstellbar ist. 5. Fuel injection valve according to claim 2, characterized in that the metered amount by plastic deformation of the weld (41) of the valve needle (3) and valve closing body (4) is adjustable.
EP01988821A 2000-10-23 2001-10-23 Fuel injection valve Withdrawn EP1330602A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2000152486 DE10052486A1 (en) 2000-10-23 2000-10-23 Fuel injector
DE10052486 2000-10-23
PCT/DE2001/003977 WO2002035083A1 (en) 2000-10-23 2001-10-23 Fuel injection valve

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EP1330602A1 true EP1330602A1 (en) 2003-07-30

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ID=7660737

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EP (1) EP1330602A1 (en)
JP (1) JP2004512459A (en)
CN (1) CN1404551A (en)
DE (1) DE10052486A1 (en)
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JP5611449B2 (en) * 2011-03-30 2014-10-22 三菱重工業株式会社 Fuel gas supply device for gas engine
CN104074652B (en) * 2014-06-30 2016-09-07 福建省莆田市中涵机动力有限公司 The split type control valve of common-rail injector
JP6494452B2 (en) * 2015-07-08 2019-04-03 日立オートモティブシステムズ株式会社 Laser welding method, high-pressure fuel supply pump and fuel injection valve
EP4060183A1 (en) * 2016-05-16 2022-09-21 Cummins, Inc. Swirl injector plunger
EP3798439A1 (en) * 2019-09-30 2021-03-31 Andreas Stihl AG & Co. KG Fuel supply device

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Publication number Priority date Publication date Assignee Title
DE3624477A1 (en) 1986-07-19 1988-01-28 Bosch Gmbh Robert INJECTION VALVE
DE4018256A1 (en) 1990-06-07 1991-12-12 Bosch Gmbh Robert ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
US5199648A (en) * 1991-03-20 1993-04-06 Zexel Corporation Fuel injection valve
DE4408875A1 (en) * 1994-03-16 1995-09-21 Bosch Gmbh Robert Fuel injection valve for IC engine
DE19855568A1 (en) * 1998-12-02 2000-06-08 Bosch Gmbh Robert Fuel injector

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Title
See references of WO0235083A1 *

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CN1404551A (en) 2003-03-19

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