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EP2795098A1 - Fuel injection valve and method for forming ejection openings - Google Patents

Fuel injection valve and method for forming ejection openings

Info

Publication number
EP2795098A1
EP2795098A1 EP12783560.1A EP12783560A EP2795098A1 EP 2795098 A1 EP2795098 A1 EP 2795098A1 EP 12783560 A EP12783560 A EP 12783560A EP 2795098 A1 EP2795098 A1 EP 2795098A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
ejection
valve
ejection openings
injection valve
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
EP12783560.1A
Other languages
German (de)
French (fr)
Other versions
EP2795098B1 (en
Inventor
Dieter Maier
Gerhard Stransky
Andreas Schrade
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 EP2795098A1 publication Critical patent/EP2795098A1/en
Application granted granted Critical
Publication of EP2795098B1 publication Critical patent/EP2795098B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9092—Sintered materials

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1 and to a method for shaping injection orifices according to the preamble of claim 10.
  • a fuel injection valve which has a stepped injection opening.
  • the ejection opening is designed starting from a chamber-shaped valve interior in a first opening section with a very small flow-determining opening width, while a subsequent second opening section is significantly widened.
  • Opening portion may be formed either widening cylindrical or conical.
  • the ejection openings are introduced by means of conventional technology, such as drilling, milling, embossing or eroding.
  • valve needle with the so-called metal injection molding method (MIM method) is made.
  • MIM method metal injection molding method
  • the valve needle is a from an anchor section and a
  • Valve sleeve section existing tubular actuating part produced by injection molding and subsequent sintering. Subsequently, the actuating part is connected by means of a welded connection with a valve closing member section, so that the valve needle is composed only of two individual components.
  • a continuous inner longitudinal opening in which fuel can flow in the direction of the valve closing member portion, which then exits the valve closing member portion by transverse openings from the valve sleeve portion.
  • Binder components and by dispensing with wetting agents can be made of metal powders dense molded parts easily by injection molding and remove them from the binder, without causing shrinkage or distortion occurs.
  • D E 10 2005 036 951 AI a fuel injection valve, which is characterized in that the valve seat body is manufactured by means of metal injection molding process. Downstream of the valve seat surface are in the
  • Valve seat body formed a plurality of ejection openings.
  • the ejection openings comprise at least one upstream first ejection opening section and one downstream second ejection opening section with a different opening width.
  • Precursors of all spray orifices extends on a partial circle either parallel or at right angles to the longitudinal axis of the valve seat body having the spray orifices
  • the precursors of the spray orifices must be removed from the mold separately.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that it is particularly simple and inexpensive to produce. Ideally, this will have the ejection openings Valve member, in particular the valve seat body, produced by metal injection molding (MIM).
  • MIM metal injection molding
  • the present invention is characterized in that injection orifices having complex contours in large numbers can be formed in a tool-bound manner with high accuracy in a molded part produced by an MIM process, so that highly precise coextensive injection orifices extending coaxially to the respective hole longitudinal axes are present.
  • the arrangement and execution of the injection openings in the valve component according to the invention enables a simultaneous shaping of a plurality of reproducible ejection openings.
  • the inventive method for molding of spray-discharge openings with the characterizing features of claim 10 has the advantage that it is possible through the hole-individual formability of the injection openings along each individually differently aligned hole longitudinal axis, the contours of
  • FIG. 1 shows a schematic section through an embodiment of a fuel injection valve according to the invention formed
  • Fig. 2 shows the detail II in the region of a spray-discharge opening in Fig. 1 in a
  • FIG. 3 shows the enlarged view of the injection opening according to Figure 2 with two
  • FIG. 4 shows the enlarged view of a spray-discharge opening in a fourth embodiment.
  • FIG. 1 An embodiment of a fuel injection valve 1 shown in FIG. 1 is in the form of a fuel injection valve 1 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 is arranged with a valve seat body 5 on a
  • Valve seat surface 6 cooperates to a sealing seat.
  • Valve seat surface 6 cooperates to a sealing seat.
  • In the fuel injection valve 1 is in the embodiment is an inwardly opening
  • the nozzle body 2 is sealed by a seal 8 against a valve housing 9.
  • the drive is, for example, an electromagnetic circuit comprising a solenoid coil 10 as an actuator, which 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 valve housing 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
  • the magnetic coil 10 is connected via a line 19 from a via an electrical
  • Plug contact 17 energized electrical power.
  • 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 is an armature 20. This is connected via a first flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21.
  • a return spring 23 On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by an adjusting sleeve 24 to bias.
  • valve needle guide 14 in the armature 20 and on a guide body 41 extend fuel channels 30, 31 and 32.
  • the fuel is via a central
  • Fuel supply 16 supplied and filtered by a filter element 25.
  • Fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 36 against a cylinder head, not shown.
  • annular damping element 33 On the downstream side of the armature 20, an annular damping element 33, which consists of an elastomer material, arranged. It rests on a second flange 34 which is non-positively connected to the valve needle 3 via a weld seam 35.
  • Valve-closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which the armature 20th moved in the stroke direction against the spring force of the return spring 23, wherein the stroke is determined by a in the rest position between the inner pole 12 and the armature 20 located working gap 27.
  • the armature 20 takes the first flange 21, which is welded to the valve needle 3, also in the stroke direction with. The standing with the valve needle 3 in connection valve closing body 4 lifts from the
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the
  • Fuel injection valve 1 is closed.
  • the ejection openings 7 in the valve seat body 5 are designed specifically.
  • the valve seat body 5 is advantageously produced by means of the so-called MIM process.
  • MIM metal injection molding
  • the already known and also referred to as metal injection molding (MIM) method comprises the production of moldings from a metal powder with a binder, for.
  • a plastic binder which are mixed together and homogenized, for example, conventional
  • Metal powder can be easily optimized for optimal magnetic and
  • the present invention is characterized in that stepped or sectioned ejection orifices 7 in large numbers in a molded part produced by MIM process, here in the valve seat body 5, are particularly simple and
  • stepped or sectioned ejection openings 7 very precise.
  • 1 shows an enlarged view in a first embodiment of section II in the region of an injection opening 7 in FIG. 1, wherein it is clear that the injection opening 7 comprises two discharge opening sections 7 ', 7 "
  • the ejection opening section T has a significantly smaller opening width than the downstream second ejection opening section 7 ".
  • the alignment of the two ejection opening sections 7 ', 7" of one and the same ejection opening 7 is thereby identical, so that there is a completely coaxial with the longitudinal axis of the hole 50 extending spray opening 7.
  • FIG. 3 shows the enlarged view of the ejection opening 7 according to FIG. 2 with two additional alternative embodiments. All three embodiments of the ejection opening 7 are designed so that a step 43 in the form of a shoulder between the two Abspritzö Stammsabitese 7 ', 7 "different
  • Opening width is available.
  • the second downstream ejection opening section 7 "in the first embodiment extends with a cylindrical wall section 45, in the second embodiment shown in dashed lines on the right with an obliquely inclined conical wall section 46 and in the third dashed line on the left All embodiments have in common is that the ejection opening 7 extends over its entire length concentric with the longitudinal axis of the hole 50.
  • Spray orifices 7 at the same time tool-bound axially along the hole longitudinal axis 50 are demoldable.
  • the corresponding spray orifices 7 at the same time tool-bound axially along the hole longitudinal axis 50 are demoldable.
  • Tool pins are sealed either flat on the inner core or in the
  • the tool pins do not seal on the inner core, but leave a small gap between the tool tip and the inner core.
  • FIG. 4 shows the enlarged view of an injection opening 7 in a fourth
  • the wall portion 51 is formed parabolic or trumpet-shaped analogous to the embodiment shown in Figure 3. Alternatively, this wall portion 51 can extend with a taper.
  • Laser drilling can be omitted. With high quality features in compliance with all dimensional tolerances, shape tolerances and positional tolerances can be
  • the injection orifices 7 with their ejection opening sections 7 ', 7 " can be produced with high reproducibility .
  • the invention is not restricted to the illustrated exemplary embodiments and can be used, for example, for ejection openings 7 arranged in a different manner.

Landscapes

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

Abstract

The fuel injection valve (1) according to the invention for fuel injection systems of internal combustion engines has an excitable actuator (10) for actuating a valve closing body (4) which forms a sealing seat together with a valve seat surface (6) which is formed on a valve seat body (5). A plurality of ejection openings (7) are formed in the valve seat body (5) downstream of the valve seat surface (6). The fuel injection valve (1) is distinguished by the fact that the ejection openings (7) comprise at least one upstream first ejection opening section (7') and one downstream second ejection opening section (7'') with a different aperture width. Here, all the ejection opening sections (7', 7'') of the individual ejection openings (7) run coaxially with respect to the respective hole longitudinal axis (50). The ejection openings (7) are formed in a valve component which is produced as an MIM part (metal injection moulding part).

Description

Beschreibung  description
Titel title
Brennstoffeinspritzventil und Verfahren zur Ausformung von Abspritzöffnungen Fuel injection valve and method for forming injection openings
Stand der Technik State of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1 und von einem Verfahren zur Ausformung von Abspritzöffnungen nach der Gattung des Anspruchs 10. The invention relates to a fuel injection valve according to the preamble of claim 1 and to a method for shaping injection orifices according to the preamble of claim 10.
Aus der G B 1,088,666 A ist bereits ein Brennstoffeinspritzventil bekannt, das eine gestufte Abspritzöffnung aufweist. Dabei ist die Abspritzöffnung ausgehend von einem kammerförmigen Ventilinnenraum in einem ersten Öffnungsabschnitt mit einer sehr geringen durchflussbestimmenden Öffnungsweite ausgeführt, während ein sich anschließender zweiter Öffnungsabschnitt deutlich aufgeweitet ist. Der zweite From the G B 1,088,666 A, a fuel injection valve is already known, which has a stepped injection opening. In this case, the ejection opening is designed starting from a chamber-shaped valve interior in a first opening section with a very small flow-determining opening width, while a subsequent second opening section is significantly widened. The second
Öffnungsabschnitt kann entweder zylindrisch oder kegelförmig erweiternd ausgebildet sein. Die Abspritzöffnungen sind mittels konventioneller Technik, wie Bohren, Fräsen, Prägen oder Erodieren eingebracht. Opening portion may be formed either widening cylindrical or conical. The ejection openings are introduced by means of conventional technology, such as drilling, milling, embossing or eroding.
Aus der D E 42 30 376 Cl ist bereits ein Brennstoffeinspritzventil bekannt, dessen Ventilnadel mit dem so genannten Metal-Injection-Molding-Verfahren (MIM- Verfahren) hergestellt ist. Bei der Ventilnadel wird ein aus einem Ankerabschnitt und einem From D E 42 30 376 Cl a fuel injection valve is already known, the valve needle with the so-called metal injection molding method (MIM method) is made. In the valve needle is a from an anchor section and a
Ventilhülsenabschnitt bestehendes rohrförmiges Betätigungsteil durch Spritzgießen und anschließendes Sintern hergestellt. Anschließend wird das Betätigungsteil mittels einer Schweißverbindung mit einem Ventilschließgliedabschnitt verbunden, so dass die Ventilnadel nur noch aus zwei Einzelbauteilen zusammengesetzt ist. Im Ankerabschnitt und Ventilhülsenabschnitt ist dabei eine durchgehende innere Längsöffnung vorgesehen, in der Brennstoff in Richtung zum Ventilschließgliedabschnitt strömen kann, der dann nahe des Ventilschließgliedabschnittes durch Queröffnungen aus dem Ventilhülsenabschnitt austritt. Bei der Fertigung der Ventilnadel mit dem MIM- Verfahren sind also Schieberwerkzeuge nötig, um die Queröffnungen auszubilden. Valve sleeve section existing tubular actuating part produced by injection molding and subsequent sintering. Subsequently, the actuating part is connected by means of a welded connection with a valve closing member section, so that the valve needle is composed only of two individual components. In the anchor section and valve sleeve portion is provided a continuous inner longitudinal opening in which fuel can flow in the direction of the valve closing member portion, which then exits the valve closing member portion by transverse openings from the valve sleeve portion. In the manufacture of the valve needle with the MIM method so slide tools are needed to form the transverse openings.
Aus der D E 40 33 952 Cl ist bereits ein binäres Bindersystem nach Art der Solid- Polymer-Solutions für die Technik des Metal Injection Molding bekannt. Es zeichnet sich durch die Verwendung physiologisch unbedenklicher niedermolekularer From the D E 40 33 952 Cl a binary binder system in the manner of solid polymer solutions for the technology of metal injection molding is already known. It is characterized by the use of physiologically harmless low molecular weight
Binderkomponenten und durch den Verzicht auf Benetzungsmittel aus. Auf diese Weise lassen sich aus Metallpulvern dichte Formteile problemlos durch Spritzgießen herstellen und aus diesen der Binder entfernen, ohne dass dabei eine Schwindung oder ein Verzug auftritt. Bekannt ist bereits aus der D E 10 2005 036 951 AI ein Brennstoffeinspritzventil, das sich dadurch auszeichnet, dass der Ventilsitzkörper mittels Metal-Injection-Molding- Verfahren hergestellt ist. Stromabwärts der Ventilsitzfläche sind in dem Binder components and by dispensing with wetting agents. In this way, can be made of metal powders dense molded parts easily by injection molding and remove them from the binder, without causing shrinkage or distortion occurs. It is already known from D E 10 2005 036 951 AI a fuel injection valve, which is characterized in that the valve seat body is manufactured by means of metal injection molding process. Downstream of the valve seat surface are in the
Ventilsitzkörper mehrere Abspritzöffnungen ausgebildet. Die Abspritzöffnungen umfassen wenigstens einen stromaufwärtigen ersten Abspritzöffnungsabschnitt und einen stromabwärtigen zweiten Abspritzöffnungsabschnitt mit einer unterschiedlichen Öffnungsweite. Ein Wandungsbereich des zweiten Abspritzöffnungsbereichs Valve seat body formed a plurality of ejection openings. The ejection openings comprise at least one upstream first ejection opening section and one downstream second ejection opening section with a different opening width. A wall area of the second spray discharge area
(„Vorstufen") aller Abspritzöffnungen verläuft auf einem Teilkreis entweder parallel oder im rechten Winkel zur Längsachse des die Abspritzöffnungen aufweisenden Ventilsitzkörpers. Die Vorstufen der Abspritzöffnungen müssen separat entformt werden. ("Precursors") of all spray orifices extends on a partial circle either parallel or at right angles to the longitudinal axis of the valve seat body having the spray orifices The precursors of the spray orifices must be removed from the mold separately.
Vorteile der Erfindung Advantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass es besonders einfach und kostengünstig herstellbar ist. In idealer Weise wird das die Abspritzöffnungen aufweisende Ventilbauteil, insbesondere der Ventilsitzkörper, mittels Metal-Injection-Molding- Verfahren (MIM) hergestellt. Die vorliegende Erfindung zeichnet sich dadurch aus, dass Abspritzöffnungen mit komplexen Konturen in großer Anzahl in einem mittels MIM-Verfahren hergestellten Formteil mit hoher Genauigkeit werkzeuggebunden ausformbar sind, so dass hochpräzise, koaxial zu den jeweiligen Lochlängsachsen verlaufende Abspritzöffnungen vorliegen. Die erfindungsgemäße Anordnung und Ausführung der Abspritzöffnungen in dem Ventilbauteil ermöglicht eine zeitgleiche Ausformung einer Vielzahl von reproduzierbaren Abspritzöffnungen. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte The fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that it is particularly simple and inexpensive to produce. Ideally, this will have the ejection openings Valve member, in particular the valve seat body, produced by metal injection molding (MIM). The present invention is characterized in that injection orifices having complex contours in large numbers can be formed in a tool-bound manner with high accuracy in a molded part produced by an MIM process, so that highly precise coextensive injection orifices extending coaxially to the respective hole longitudinal axes are present. The arrangement and execution of the injection openings in the valve component according to the invention enables a simultaneous shaping of a plurality of reproducible ejection openings. The measures listed in the dependent claims are advantageous
Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Further developments and improvements specified in claim 1
Brennstoffeinspritzventils möglich. Fuel injection valve possible.
Das erfindungsgemäße Verfahren zur Ausformung von Abspritzöffnungen mit den kennzeichnenden Merkmalen des Anspruchs 10 hat den Vorteil, dass es durch die lochindividuelle Ausformbarkeit der Abspritzöffnungen entlang jeder einzelnen unterschiedlich ausgerichteten Lochlängsachse möglich ist, die Konturen der The inventive method for molding of spray-discharge openings with the characterizing features of claim 10 has the advantage that it is possible through the hole-individual formability of the injection openings along each individually differently aligned hole longitudinal axis, the contours of
Abspritzöffnungsabschnitte in einer sehr hohen Varianz in einem Spritzgießwerkzeug zu integrieren. Es ergeben sich erhebliche Kostenvorteile gegenüber bekannten Lösungen, da die Abspritzöffnungen mit ihren Abspritzöffnungsabschnitten Abspritzöffnungsabschnitte to integrate in a very high variance in an injection mold. There are significant cost advantages over known solutions, since the spray orifices with their Abspritzöffnungsabschnitten
werkzeuggebunden hergestellt werden können. Bekannte separate Arbeitsgänge zur Herstellung der Abspritzöffnungsabschnitte wie z.B. Stanzen, Bohren, Erodieren oder Laserbohren können entfallen. Mit hohen Qualitätsmerkmalen unter Einhaltung aller Maßtoleranzen, Formtoleranzen und Lagetoleranzen lassen sich die Abspritzöffnungen mit ihren Abspritzöffnungsabschnitten erfindungsgemäß mit hoher Reproduzierbarkeit herstellen. can be manufactured tool-bound. Known separate operations for producing the Abspritzöffnungsabschnitte such. Punching, drilling, eroding or laser drilling can be omitted. With high quality features in compliance with all dimensional tolerances, shape tolerances and position tolerances can be the injection orifices produced with their Abspritzöffnungsabschnitten invention with high reproducibility.
Zeichnung Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig. 1 einen schematischen Schnitt durch ein Ausführungsbeispiel eines Brennstoffeinspritzventils mit erfindungsgemäß ausgeformten Drawing embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it Fig. 1 shows a schematic section through an embodiment of a fuel injection valve according to the invention formed
Abspritzöffnungen in einem Ventilsitzkörper,  Spray openings in a valve seat body,
Fig. 2 den Ausschnitt II im Bereich einer Abspritzöffnung in Fig. 1 in einer Fig. 2 shows the detail II in the region of a spray-discharge opening in Fig. 1 in a
vergrößerten Darstellung, wobei die Abspritzöffnung in einer ersten  enlarged view, wherein the injection opening in a first
Ausführung ausgestaltet ist,  Execution is designed,
Fig. 3 die vergrößerte Ansicht der Abspritzöffnung gemäß Figur 2 mit zwei Fig. 3 shows the enlarged view of the injection opening according to Figure 2 with two
zusätzlichen alternativen Ausführungen und  additional alternative designs and
Fig. 4 die vergrößerte Ansicht einer Abspritzöffnung in einer vierten Ausführung. 4 shows the enlarged view of a spray-discharge opening in a fourth embodiment.
Beschreibung der Ausführungsbeispiele Description of the embodiments
Ein in Fig. 1 dargestelltes Ausführungsbeispiel eines Brennstoffeinspritzventils 1 ist der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine. Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht mit einem Ventilschließkörper 4 in Wirkverbindung, der mit einer an einem Ventilsitzkörper 5 angeordneten An embodiment of a fuel injection valve 1 shown in FIG. 1 is in the form of a fuel injection valve 1 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 is arranged with a valve seat body 5 on a
Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Valve seat surface 6 cooperates to a sealing seat. In the fuel injection valve 1 is in the embodiment is an inwardly opening
Brennstoffeinspritzventil 1, welches über wenigstens zwei Abspritzöffnungen 7 verfügt. Das Brennstoffeinspritzventil 1 ist jedoch idealerweise als Mehrloch- Einspritzventil ausgeführt und hat deshalb zwischen vier und dreißig Abspritzöffnungen 7. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen ein Ventilgehäuse 9 abgedichtet. Als Antrieb dient z.B. ein elektromagnetischer Kreis, der eine Magnetspule 10 als Aktuator umfasst, die in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt ist, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und das Ventilgehäuse 9 sind durch eine Verengung 26 voneinander getrennt und miteinander durch ein nicht ferromagnetisches Verbindungsbauteil 29 verbunden. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Fuel injection valve 1, which has at least two ejection openings 7. However, the fuel injection valve 1 is ideally designed as a multi-hole injection valve and therefore has between four and thirty ejection openings 7. The nozzle body 2 is sealed by a seal 8 against a valve housing 9. The drive is, for example, an electromagnetic circuit comprising a solenoid coil 10 as an actuator, which 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 valve housing 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29. The magnetic coil 10 is connected via a line 19 from a via an electrical
Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann. Plug contact 17 energized electrical power. 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. Auf der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen ersten Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem ersten Flansch 21 verbunden ist. Auf dem ersten Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Einstellhülse 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 is an armature 20. This is connected via a first flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 with the first flange 21. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by an adjusting sleeve 24 to bias.
In der Ventilnadelführung 14, im Anker 20 und an einem Führungskörper 41 verlaufen Brennstoffkanäle 30, 31 und 32. Der Brennstoff wird über eine zentrale In the valve needle guide 14, in the armature 20 and on a guide body 41 extend fuel channels 30, 31 and 32. The fuel is via a central
Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Das Fuel supply 16 supplied and filtered by a filter element 25. The
Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Brennstoffverteilerleitung und durch eine weitere Dichtung 36 gegen einen nicht weiter dargestellten Zylinderkopf abgedichtet. Fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 36 against a cylinder head, not shown.
Auf der stromabwärtigen Seite des Ankers 20 ist ein ringförmiges Dämpfungselement 33, welches aus einem Elastomerwerkstoff besteht, angeordnet. Es liegt auf einem zweiten Flansch 34 auf, welcher über eine Schweißnaht 35 kraftschlüssig mit der Ventilnadel 3 verbunden ist. On the downstream side of the armature 20, an annular damping element 33, which consists of an elastomer material, arranged. It rests on a second flange 34 which is non-positively connected to the valve needle 3 via a weld seam 35.
Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der In the idle state of the fuel injection valve 1, the armature 20 of the
Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, dass der Return spring 23 acted against its stroke direction so that the
Ventilschließkörper 4 an der Ventilsitzfläche 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den ersten Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Valve-closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon excitation of the magnetic coil 10, this builds up a magnetic field, which the armature 20th moved in the stroke direction against the spring force of the return spring 23, wherein the stroke is determined by a in the rest position between the inner pole 12 and the armature 20 located working gap 27. The armature 20 takes the first flange 21, which is welded to the valve needle 3, also in the stroke direction with. The standing with the valve needle 3 in connection valve closing body 4 lifts from the
Ventilsitzfläche 6 ab, und der Brennstoff wird durch die Abspritzöffnungen 7 Valve seat surface 6 from, and the fuel is through the ejection openings. 7
abgespritzt. hosed.
Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Verbindung stehende erste Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das 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 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the
Brennstoffeinspritzventil 1 geschlossen wird. Fuel injection valve 1 is closed.
Erfindungsgemäß sind die Abspritzöffnungen 7 im Ventilsitzkörper 5 spezifisch ausgeführt. Der Ventilsitzkörper 5 wird in vorteilhafter Weise mittels so genanntem MIM-Verfahren hergestellt. Das bereits bekannte und auch als Metal-Injection-Molding (MIM) bezeichnete Verfahren umfasst die Herstellung von Formteilen aus einem Metallpulver mit einem Bindemittel, z. B. einem Kunststoffbindemittel, die miteinander gemischt und homogenisiert werden, beispielsweise auf konventionellen According to the invention, the ejection openings 7 in the valve seat body 5 are designed specifically. The valve seat body 5 is advantageously produced by means of the so-called MIM process. The already known and also referred to as metal injection molding (MIM) method comprises the production of moldings from a metal powder with a binder, for. As a plastic binder, which are mixed together and homogenized, for example, conventional
Kunststoffspritzgießmaschinen und das nachfolgende Entfernen des Bindemittels und Sintern des verbleibenden Metallpulvergerüsts. Die Zusammensetzung des Plastic injection molding machines and the subsequent removal of the binder and sintering of the remaining metal powder scaffold. The composition of the
Metallpulvers kann dabei auf einfache Weise auf optimale magnetische und Metal powder can be easily optimized for optimal magnetic and
thermische Eigenschaften abgestimmt werden. thermal properties are matched.
Bei Brennstoffeinspritzventilen 1 zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine besteht ein erhebliches Risiko der Belagbildung an den stromabwärtigen Bauteilen, wie Spritzlochscheiben und Ventilsitzkörpern. Insbesondere sind die Abspritzöffnungen 7 anfällig gegen eine Verkokung des freien Querschnitts, so dass es in nachteiliger Weise zu Mindermengen gegenüber den gewünschten Abspritzmengen kommen kann. Entsprechend wünschenswert ist es, den Temperaturhaushalt im Bereich des stromabwärtigen Endes des In fuel injection valves 1 for injecting fuel directly into the combustion chamber of an internal combustion engine, there is a considerable risk of the formation of deposits on the downstream components, such as spray perforated disks and valve seat bodies. In particular, the ejection openings 7 are susceptible to coking of the free cross-section, so that it disadvantageously to small quantities compared to the desired spray rates can come. Accordingly, it is desirable, the temperature balance in the region of the downstream end of the
Brennstoffeinspritzventils 1 rund um den Ventilsitzkörper 5 gezielt einzustellen. Set fuel injection valve 1 around the valve seat body 5 targeted.
Außerdem soll bestmöglich sichergestellt werden, dass über die Abspritzöffnungen 7 über die gesamte Lebensdauer des Brennstoffeinspritzventils 1 eine konstante In addition, the best possible to ensure that the discharge openings 7 over the entire life of the fuel injection valve 1 a constant
Durchflussmenge abspritzbar ist. Es wurde herausgefunden, dass insbesondere bei gestuften Abspritzöffnungen 7, die in stromabwärtiger Richtung eine  Flow rate can be sprayed off. It has been found that, in particular in stepped injection orifices 7, which in the downstream direction
Öffnungsweitenvergrößerung besitzen, die Neigung zur Belagbildung, Verkokung und damit die Gefahr des Zusetzens des freien Querschnitts der Abspritzöffnungen 7 erheblich reduziert sind. Have opening width enlargement, the tendency to deposit formation, coking and thus the risk of adding the free cross section of the ejection openings 7 are considerably reduced.
Die vorliegende Erfindung zeichnet sich dadurch aus, dass gestufte bzw. in Abschnitte untergliederte Abspritzöffnungen 7 in großer Anzahl in einem mittels MIM -Verfahren hergestellten Formteil, hier in dem Ventilsitzkörper 5 besonders einfach und The present invention is characterized in that stepped or sectioned ejection orifices 7 in large numbers in a molded part produced by MIM process, here in the valve seat body 5, are particularly simple and
kostengünstig und mit hoher Genauigkeit werkzeuggebunden ausformbar sind. Bei bekannten Abspritzöffnungen von Brennstoffeinspritzventilen, die als Mehrloch-Ventile ausgeführt sind, besitzt jede Abspritzöffnung bzw. bei gestuften Abspritzöffnungen jeder stromabwärtige Abspritzöffnungsabschnitt einen eigenen Raumwinkel. Für eine optimierte und kostengünstige und damit zeitgleiche Ausformung einer Vielzahl von Abspritzöffnungen 7 ist eine solche Anordnung und Ausführung der Abspritzöffnungen 7 im Ventilsitzkörper 5 erschwerend. cost-effective and tool-bound with high accuracy can be formed. In known spray openings of fuel injection valves, which are designed as multi-hole valves, each injection or in stepped injection openings each downstream Abspritzöffnungsabschnitt has its own solid angle. For an optimized and cost-effective and thus simultaneous shaping of a multiplicity of ejection openings 7, such an arrangement and embodiment of the ejection openings 7 in the valve seat body 5 is aggravating.
Gemäß der Erfindung ist es möglich, in besonders vorteilhafter Weise gestufte oder in Abschnitte untergliederte Abspritzöffnungen 7 sehr präzise auszuformen. Figur 2 zeigt den Ausschnitt II im Bereich einer Abspritzöffnung 7 in Figur 1 in einer vergrößerten Darstellung in einer ersten Ausführung, wobei deutlich wird, dass die Abspritzöffnung 7 zwei Abspritzöffnungsabschnitte 7', 7" umfasst. Der stromaufwärtige erste According to the invention, it is possible to form in a particularly advantageous manner stepped or sectioned ejection openings 7 very precise. 1 shows an enlarged view in a first embodiment of section II in the region of an injection opening 7 in FIG. 1, wherein it is clear that the injection opening 7 comprises two discharge opening sections 7 ', 7 "
Abspritzöffnungsabschnitt T hat dabei eine deutlich kleinere Öffnungsweite als der stromabwärts folgende zweite Abspritzöffnungsabschnitt 7". Die Ausrichtung der beiden Abspritzöffnungsabschnitte 7', 7" ein und derselben Abspritzöffnung 7 ist dabei identisch, so dass also eine vollständig koaxial zur Lochlängsachse 50 verlaufende Abspritzöffnung 7 vorliegt. In this case, the ejection opening section T has a significantly smaller opening width than the downstream second ejection opening section 7 ". The alignment of the two ejection opening sections 7 ', 7" of one and the same ejection opening 7 is thereby identical, so that there is a completely coaxial with the longitudinal axis of the hole 50 extending spray opening 7.
In Figur 3 ist die vergrößerte Ansicht der Abspritzöffnung 7 gemäß Figur 2 mit zwei zusätzlichen alternativen Ausführungen gezeigt. Alle drei Ausführungsformen der Abspritzöffnung 7 sind dabei so ausgelegt, dass eine Stufe 43 in Form eines Absatzes zwischen den beiden Abspritzöffnungsabschnitte 7', 7" unterschiedlicher FIG. 3 shows the enlarged view of the ejection opening 7 according to FIG. 2 with two additional alternative embodiments. All three embodiments of the ejection opening 7 are designed so that a step 43 in the form of a shoulder between the two Abspritzöffnungsabschnitte 7 ', 7 "different
Öffnungsweite vorhanden ist. Von der Stufe 43 ausgehend erstreckt sich der zweite stromabwärtige Abspritzöffnungsabschnitt 7" in der ersten Ausführung mit einem zylindrischen Wandabschnitt 45, in der zweiten gestrichelt auf der rechten Seite dargestellten Ausführung mit einem schräg geneigten, konischen Wandabschnitt 46 bzw. in der dritten gestrichelt auf der linken Seite dargestellten Ausführung mit einem parabel- bzw. trompetenförmigen Wandabschnitt 47. Allen Ausführungsbeispielen gemeinsam ist, dass die Abspritzöffnung 7 über ihre gesamte Länge konzentrisch zur Lochlängsachse 50 verläuft. Opening width is available. Starting from the step 43, the second downstream ejection opening section 7 "in the first embodiment extends with a cylindrical wall section 45, in the second embodiment shown in dashed lines on the right with an obliquely inclined conical wall section 46 and in the third dashed line on the left All embodiments have in common is that the ejection opening 7 extends over its entire length concentric with the longitudinal axis of the hole 50.
Die Pfeile 44 in der Figur 2 sollen anzeigen, dass bei einer solchen Ausführung der Abspritzöffnungsabschnitte 7', 7" in idealer Weise im MIM-Prozess alle Arrows 44 in FIG. 2 are intended to indicate that in such an embodiment, spray discharge opening sections 7 ', 7 "are ideally all in the MIM process
Abspritzöffnungen 7 zugleich werkzeuggebunden axial entlang der Lochlängsachse 50 entformbar sind. Dazu wird in erfindungsgemäßer Weise das entsprechende Spray orifices 7 at the same time tool-bound axially along the hole longitudinal axis 50 are demoldable. For this purpose, according to the invention, the corresponding
Spritzgießwerkzeug derart ausgeführt, dass die Abspritzöffnungen 7 fertig fallend hergestellt werden. Das bedeutet, dass die jeweiligen nicht dargestellten  Injection mold executed such that the ejection openings 7 are made ready falling. This means that the respective not shown
Werkzeugstifte entweder plan am Innenkern abgedichtet sind oder in den Tool pins are sealed either flat on the inner core or in the
Werkzeuginnenkern eintauchen. Alternativ kann auch vorgesehen sein, dass die Werkzeugstifte nicht am Innenkern abdichten, sondern ein geringer Zwischenraum zwischen der Werkzeugstiftspitze und dem Innenkern belassen wird. Dieser Immerse tool core. Alternatively, it can also be provided that the tool pins do not seal on the inner core, but leave a small gap between the tool tip and the inner core. This
Zwischenraum ist mit Material gefüllt, der im Spritzzustand oder im fertigen MIM- Zustand noch entfernt werden muss. Figur 4 zeigt die vergrößerte Ansicht einer Abspritzöffnung 7 in einer vierten Gap is filled with material that still needs to be removed when sprayed or in the finished MIM condition. FIG. 4 shows the enlarged view of an injection opening 7 in a fourth
Ausführung. Bei diesem Ausführungsbeispiel liegt zwischen den Abspritzöffnungsabschnitten 7', 7" keine Stufe 43 vor. Vielmehr verläuft der erste stromaufwärtige Abspritzöffnungsabschnitt T in einer zylindrischen Gestalt, während sich von einer mittleren Lochebene beginnend der zweite stromabwärtige Execution. In this embodiment lies between the Ejection port portions 7 ', 7 "does not have a step 43. Rather, the first upstream ejection port portion T is in a cylindrical shape, while starting from a central hole plane, the second downstream
Abspritzöffnungsabschnitt 7" anschließt, dessen Wandabschnitt 51 analog dem in Figur 3 gezeigten Ausführungsbeispiel parabel- bzw. trompetenförmig ausgeformt ist. Alternativ kann auch dieser Wandabschnitt 51 mit einer Konizität verlaufen. Abspritzöffnungsabschnitt 7 "connects, the wall portion 51 is formed parabolic or trumpet-shaped analogous to the embodiment shown in Figure 3. Alternatively, this wall portion 51 can extend with a taper.
Durch die axiale Ausformbarkeit der gestuften bzw. in Abschnitte untergliederten Abspritzöffnungen 7 ist es möglich, die Konturen der Abspritzöffnungsabschnitte 7" in einer hohen Varianz in einem Spritzgießwerkzeug zu integrieren. Es ergeben sich erhebliche Kostenvorteile gegenüber bekannten Lösungen, da die Abspritzöffnungen 7 mit ihren Abspritzöffnungsabschnitten 7', 7" werkzeuggebunden hergestellt werden können. Bekannte separate Arbeitsgänge zur Herstellung der Due to the axial formability of the stepped or sectional injection openings 7, it is possible to integrate the contours of the ejection opening sections 7 "in a high variance in an injection molding tool ', 7 "can be made tool-bound. Known separate operations for the production of
Abspritzöffnungsabschnitte 7', 7" wie z.B. Stanzen, Bohren, Erodieren oder Abspritzöffnungsabschnitte 7 ', 7 "such as punching, drilling, eroding or
Laserbohren können entfallen. Mit hohen Qualitätsmerkmalen unter Einhaltung aller Maßtoleranzen, Formtoleranzen und Lagetoleranzen lassen sich die Laser drilling can be omitted. With high quality features in compliance with all dimensional tolerances, shape tolerances and positional tolerances can be
Abspritzöffnungen 7 mit ihren Abspritzöffnungsabschnitten 7', 7" erfindungsgemäß mit hoher Reproduzierbarkeit herstellen. Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. für andersartig angeordnete Abspritzöffnungen 7 anwendbar. In accordance with the invention, the injection orifices 7 with their ejection opening sections 7 ', 7 "can be produced with high reproducibility .The invention is not restricted to the illustrated exemplary embodiments and can be used, for example, for ejection openings 7 arranged in a different manner.

Claims

Ansprüche 1. Brennstoffeinspritzventil (1) für Brennstoffeinspritzanlagen von Claims 1. Fuel injection valve (1) for fuel injection systems of
Brennkraftmaschinen mit einem erregbaren Aktuator (10) zur Betätigung eines Ventilschließkörpers (4), der zusammen mit einer an einem Ventilsitzkörper (5) ausgebildeten Ventilsitzfläche (6) einen Dichtsitz bildet, und Abspritzöffnungen (7), die stromabwärts der Ventilsitzfläche (6) ausgebildet sind,  Internal combustion engine having an excitable actuator (10) for actuating a valve closing body (4) which forms a sealing seat together with a valve seat surface (6) formed on a valve seat body (5), and ejection openings (7) formed downstream of the valve seat surface (6) .
dadurch gekennzeichnet, characterized,
dass die Abspritzöffnungen (7) wenigstens einen stromaufwärtigen ersten in that the ejection openings (7) have at least one upstream first
Abspritzöffnungsabschnitt (7') und einen stromabwärtigen zweiten Abspritzöffnungsabschnitt (7 ') and a downstream second
Abspritzöffnungsabschnitt (7") mit einer unterschiedlichen Öffnungsweite umfassen, alle Abspritzöffnungsabschnitte (7', 7") der einzelnen Abspritzöffnungen (7) koaxial zur jeweiligen Lochlängsachse (50) verlaufen und die Abspritzöffnungen (7) in einem als MIM-Teil (Metal-Injection-Molding-Teil) hergestellten Ventilbauteil ausgeformt sind. Abspritzöffnungsabschnitt (7 ") having a different opening width, all Abspritzöffnungsabschnitte (7 ', 7") of the individual ejection openings (7) extend coaxially to the respective hole longitudinal axis (50) and the ejection openings (7) in a MIM part (Metal Injection Molded part) are formed.
2. Brennstoffeinspritzventil nach Anspruch 1, 2. Fuel injection valve according to claim 1,
dadurch gekennzeichnet, characterized,
dass das die Abspritzöffnungen (7) aufweisende Ventilbauteil der Ventilsitzkörper (5) ist. the valve component having the ejection openings (7) is the valve seat body (5).
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, 3. Fuel injection valve according to claim 1 or 2,
dadurch gekennzeichnet, characterized,
dass eine Stufe (43) in Form eines Absatzes zwischen den beiden a step (43) in the form of a shoulder between the two
Abspritzöffnungsabschnitten (7', 7") unterschiedlicher Öffnungsweite vorgesehen ist. Abspritzöffnungsabschnitten (7 ', 7 ") of different opening width is provided.
4. Brennstoffeinspritzventil nach Anspruch 3, 4. Fuel injection valve according to claim 3,
dadurch gekennzeichnet, dass sich von der Stufe (43) ausgehend der zweite stromabwärtige characterized, that from the stage (43) starting from the second downstream
Abspritzöffnungsabschnitt (7") der Abspritzöffnung (7) mit einem zylindrischen Wandabschnitt (45) erstreckt. Abspritzöffnungsabschnitt (7 ") of the ejection opening (7) with a cylindrical wall portion (45) extends.
5. Brennstoffeinspritzventil nach Anspruch 3, 5. Fuel injection valve according to claim 3,
dadurch gekennzeichnet, characterized,
dass sich von der Stufe (43) ausgehend der zweite stromabwärtige that from the stage (43) starting from the second downstream
Abspritzöffnungsabschnitt (7") der Abspritzöffnung (7) mit einem schräg geneigten, konischen Wandabschnitt (46) erstreckt. Abspritzöffnungsabschnitt (7 ") of the ejection opening (7) with an inclined, conical wall portion (46) extends.
6. Brennstoffeinspritzventil nach Anspruch 3, 6. Fuel injection valve according to claim 3,
dadurch gekennzeichnet, characterized,
dass sich von der Stufe (43) ausgehend der zweite stromabwärtige that from the stage (43) starting from the second downstream
Abspritzöffnungsabschnitt (7") der Abspritzöffnung (7) mit einem parabel- bzw. trompetenförmigen Wandabschnitt (47) erstreckt. Abspritzöffnungsabschnitt (7 ") of the ejection opening (7) with a parabolic or trumpet-shaped wall portion (47) extends.
7. Brennstoffeinspritzventil nach Anspruch 1 oder 2, 7. Fuel injection valve according to claim 1 or 2,
dadurch gekennzeichnet, characterized,
dass der erste stromaufwärtige Abspritzöffnungsabschnitt (7') in einer zylindrischen Gestalt verläuft, wobei sich von einer mittleren Lochebene beginnend der zweite stromabwärtige Abspritzöffnungsabschnitt (7") anschließt, dessen Wandabschnitt (51) parabel- bzw. trompetenförmig oder konisch ausgeformt ist. in that the first upstream ejection opening section (7 ') extends in a cylindrical shape, starting from a central hole plane starting from the second downstream ejection opening section (7 "), the wall section (51) of which has a parabolic or trumpet-shaped or conical shape.
8. Brennstoffeinspritzventil nach einem der vorhergehenden Ansprüche, 8. Fuel injection valve according to one of the preceding claims,
dadurch gekennzeichnet, characterized,
dass die Abspritzöffnungen (7) zugleich axial entlang ihrer Lochlängsachsen (50) entformbar sind. that the ejection openings (7) at the same time along its hole longitudinal axes (50) are demoulded axially.
9. Brennstoffeinspritzventil nach einem der vorhergehenden Ansprüche, 9. Fuel injection valve according to one of the preceding claims,
dadurch gekennzeichnet, dass zwischen zwei und dreißig Abspritzöffnungen (7) in dem entsprechenden MIM- Ventilbauteil vorgesehen sind. characterized, that between two and thirty ejection openings (7) are provided in the corresponding MIM valve component.
10. Verfahren zur Ausformung von Abspritzöffnungen (7) an einem Abspritzöffnungen (7) aufweisenden Ventilbauteil (5) eines Brennstoffeinspritzventils (1), 10. A method for forming spray-discharge openings (7) on a spray-discharge openings (7) having valve component (5) of a fuel injection valve (1),
dadurch gekennzeichnet, characterized,
dass das Ventilbauteil (5) mittels Metal-Injection-Molding-Verfahren mit den that the valve member (5) by means of metal injection molding method with the
Verfahrensschritten steps
- Mischen und Homogenisieren eines Metallpulvers und eines Bindemittels,  Mixing and homogenizing a metal powder and a binder,
- nachfolgendes Spritzgießen, subsequent injection molding,
- Entfernen des Bindemittels und  - Removal of the binder and
- Sintern des Metallpulvergerüsts  - sintering of the metal powder scaffold
hergestellt wird und die Abspritzöffnungen (7) darin derart ausgeformt werden, dass sie wenigstens einen stromaufwärtigen ersten Abspritzöffnungsabschnitt (7') und einen stromabwärtigen zweiten Abspritzöffnungsabschnitt (7") mit einer unterschiedlichen Öffnungsweite umfassen, wobei alle Abspritzöffnungsabschnitte (7', 7") der einzelnen Abspritzöffnungen (7) koaxial zur jeweiligen Lochlängsachse (50) verlaufen und die Abspritzöffnungen (7) zugleich entformt werden. and the ejection openings (7) are formed therein so as to include at least one upstream first ejection opening section (7 ') and a downstream second ejection opening section (7 ") having a different opening width, wherein all ejection opening sections (7', 7") individual ejection openings (7) extend coaxially to the respective hole longitudinal axis (50) and the ejection openings (7) are simultaneously removed from the mold.
EP12783560.1A 2011-12-20 2012-10-30 Fuel injection valve and method for forming ejection openings Not-in-force EP2795098B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089240A DE102011089240A1 (en) 2011-12-20 2011-12-20 Fuel injection valve and method for forming injection openings
PCT/EP2012/071446 WO2013091963A1 (en) 2011-12-20 2012-10-30 Fuel injection valve and method for forming ejection openings

Publications (2)

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EP2795098A1 true EP2795098A1 (en) 2014-10-29
EP2795098B1 EP2795098B1 (en) 2016-08-17

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EP12783560.1A Not-in-force EP2795098B1 (en) 2011-12-20 2012-10-30 Fuel injection valve and method for forming ejection openings

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US (1) US20150034053A1 (en)
EP (1) EP2795098B1 (en)
DE (1) DE102011089240A1 (en)
WO (1) WO2013091963A1 (en)

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DE102016222906A1 (en) 2016-11-21 2018-05-24 Robert Bosch Gmbh Valve for metering a fluid

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US20150034053A1 (en) 2015-02-05
EP2795098B1 (en) 2016-08-17
WO2013091963A1 (en) 2013-06-27
DE102011089240A1 (en) 2013-06-20

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