EP1613857B1 - Method for producing and fixing a perforated disk - Google Patents

Method for producing and fixing a perforated disk Download PDF

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Publication number
EP1613857B1
EP1613857B1 EP04707869A EP04707869A EP1613857B1 EP 1613857 B1 EP1613857 B1 EP 1613857B1 EP 04707869 A EP04707869 A EP 04707869A EP 04707869 A EP04707869 A EP 04707869A EP 1613857 B1 EP1613857 B1 EP 1613857B1
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EP
European Patent Office
Prior art keywords
perforated disc
sheet
stamping
valve seat
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP04707869A
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German (de)
French (fr)
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EP1613857A1 (en
Inventor
Markus Gesk
Martin Maier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1613857A1 publication Critical patent/EP1613857A1/en
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Publication of EP1613857B1 publication Critical patent/EP1613857B1/en
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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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M61/16—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
    • F02M61/1853—Orifice plates

Definitions

  • the invention is based on a method for producing and fixing a perforated disc according to the preamble of the main claim.
  • a fuel injection valve which has a valve seat body on which a fixed valve seat is formed. With this valve seat formed in the valve seat body acts in the injection valve axially movable valve closing body together.
  • the valve seat body is adjoined in the downstream direction by a flat nozzle straightening plate in which an H-shaped depression facing the valve seat is provided as the inlet region.
  • Four injection ports are connected to the H-shaped inlet region in the downstream direction, so that a fuel to be sprayed can be distributed over the inlet region as far as the spray-discharge holes.
  • An influence of the flow geometry in the nozzle orifice plate through the valve seat body should not occur. Instead, a flow passage downstream of the valve seat in the valve seat body is designed so far that the valve seat body has no influence on the opening geometry of the nozzle guide plate.
  • the inventive method for producing and fixing a perforated disc having the features of the main claim has the advantage that in a simple manner particularly low perforated disc thicknesses or thicknesses can be achieved. Since, according to the invention, the ejection openings are introduced in the thickness-reduced middle region of the orifice plate, it is possible, while maintaining known and customary ratios of length to diameter, to form a plurality of injection orifices with very small injection orifice diameters in the perforated disc. As a consequence, a perforated disk produced according to the invention and attached to a fuel injection valve guarantees a uniform atomization of the fuel, a particularly high degree of atomization being achieved and jet shaping adapted to the respective requirements.
  • the stamping or punching applied to the thickness reduction of the perforated disk can advantageously be used in very large numbers for the production of perforated disks at low cost.
  • the perforated disc produced according to the invention is mounted on a fuel injection valve such that the perforated disc arranged downstream of a valve seat has an opening geometry for a complete axial passage of the fuel, which is bounded by a valve seat body comprising the fixed valve seat.
  • the valve seat body already takes over the function of a flow influencing in the perforated disc.
  • an S-blow is achieved in the flow for atomization improvement of the fuel, as the Valve seat body covered with a lower end face the spray openings of the perforated disc.
  • valve seat body and perforated disc S-blow in the flow allows the formation of strange beam shapes with a high Zerstäubungsgüte.
  • the perforated discs, in conjunction with correspondingly designed valve seat bodies for single, dual and multi-jet sprays, enable beam cross sections in innumerable variations. With such a fuel injection valve, the exhaust emission of the engine can be reduced and also a reduction in fuel consumption can be achieved.
  • FIG. 1 a partially illustrated injection valve with a perforated disc downstream of the valve seat body
  • FIG. 2 the valve seat part consisting of valve seat body and perforated disc in an enlarged view
  • FIG. 3 schematically the process step of embossing or enforcing.
  • FIG. 1 a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignited internal combustion engines is partially shown.
  • the injection valve has a tubular valve seat carrier 1, in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2 is.
  • a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2 is.
  • the actuation of the injection valve takes place in a known manner, for example electromagnetically.
  • a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
  • the armature 11 is connected to the valve closing body. 7 opposite end of the valve needle 5 by z. B. connected by means of a laser weld and aligned with the core 12.
  • a guide opening 15 of a valve seat body 16 which is mounted in the downstream, the core 12 remote from the end of the valve seat support 1 in the concentric with the valve longitudinal axis 2 extending longitudinal opening 3 by welding tight.
  • lower end face 17 of the valve seat body 16 On its side facing away from the valve closing body 7, lower end face 17 of the valve seat body 16 with a z.
  • pot-shaped perforated disc 20 concentrically and firmly connected.
  • the perforated disc 20 is designed with a bottom part 24 and a retaining edge 26.
  • the retaining edge 26 extends in the axial direction facing away from the valve seat body 16 and is bent conically outward to its end.
  • valve seat body 16 and perforated disc 20 for example, by a circumferential and dense, formed by a laser first weld 25 in an outer annular region of the bottom part 24.
  • the perforated disc should 20 in this mounting area have a thickness of at least 0.2 mm.
  • the perforated disc 20 is connected in the region of the retaining edge 26 of the other with the wall of the longitudinal opening 3 in the valve seat carrier 1, for example by a circumferential and dense second weld 30.
  • a middle region 33 of the bottom part 24 of the perforated disc 20 is reduced in thickness relative to the outer annular region of the bottom part 24 or opposite the retaining edge 26.
  • At least one, but ideally a plurality of spray-discharge openings 34 is introduced in this central region 33.
  • the injection openings 34 are advantageously located in the outer edge area of the thickness-reduced middle area 33, which is e.g. is formed circular, so that the lower end face 17 of the valve seat body 16 covers the ejection openings 34, whereby the fuel flow downstream of the valve seat 29 between an outlet opening 31 in the valve seat body 16 and the ejection openings 34 in the perforated disc 20 takes a respective S-shaped course.
  • valve seat body 16 and cup-shaped perforated disc 20 valve seat part in the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 in non-energized solenoid 10 by the system of the valve closing body 7 at the downstream conically tapered valve seat 29 of the valve seat body 16 is fixed.
  • the other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12.
  • the path between these two end positions of the valve needle 5 thus represents the stroke.
  • the valve closing body 7 cooperates with the valve seat 29.
  • the valve seat body 16 is formed with its lower outlet opening 31 such that the lower Front side 17 of the valve seat body 16 partially forms an upper cover of an emerging through the recess in the central region 33 of the perforated disc 20 inlet portion 40 of the perforated disc 20 and thus defines the entrance surface of the fuel in the perforated disc 20.
  • the outlet opening 31 has a smaller diameter than the diameter of an imaginary circle on which the ejection openings 34 of the perforated disc 20 are located. Due to the radial offset of the spray openings 34 with respect to the outlet opening 31 results in an S-shaped flow pattern of the medium, here the fuel, to each injection port 34 out, in FIG. 2 indicated by arrows 36.
  • FIG. 2 the valve member formed from the valve seat body 16 and the perforated disc 20 is shown in an enlarged view in order to make clear the S-shaped flow pattern, marked with arrows 36, to each spray opening 34 out.
  • FIG. 3 schematically shows the process step of embossing.
  • a flat metallic sheet 20 'with a constant thickness is provided.
  • This sheet 20 ' for example, has a thickness of about 0.2 mm, which remains maintained even after application of the method steps according to the invention outside the range 33.
  • the sheet 20 ' is, for example, a stainless steel material, such as 1.4404, 1.4301 or SUS304, with a tensile strength of 500 to 700 N / mm 2 and an initial hardness of 160 +/- 15 HV.
  • the perforated disc 20 should at least in its annular region of the bottom part 24, in which the attachment of the perforated disc 20 is provided on the valve seat body 16 by means of the weld 25, have a minimum thickness of 0.2 mm.
  • the spray hole diameters are also largely predetermined with a minimum value for a given minimum thickness.
  • a plurality of spray openings 34 are formed with very small spray hole diameters, for example less than 0.2 mm in the perforated disc 20 for reasons of improved atomization and spray treatment, it is advantageous in the region 33 of the spray openings 34, a thickness reduction on the sheet 20 ', from the later perforated disc 20 is formed to make.
  • a reduction in thickness is achieved by stamping, whereby a recess 40 'is formed in the sheet 20' ( FIG. 3 ).
  • This recess 40 ' has, for example, a frusto-conical inclined or cylindrical boundary wall on.
  • the reduction in thickness in the area 33 made by stamping may be about 0.05 mm to 0.1 mm with an initial thickness of the sheet 20 'of 0.12 mm to 0.25 mm.
  • Symbolic is in FIG. 3 an embossing tool 41 indicated.
  • the reduction in thickness of the sheet metal 20 'in the area 33 in which the ejection openings 34 are arranged can also be realized by so-called embossing. It is a deep-drawing-like punching-bending process as another way of cold forming a metal.
  • the passage through to the formation of the inlet region 40 of the perforated disc 20 is suitable if the hardness of the material to be deformed is greater than or substantially greater than 160 HV.
  • This supernatant material will be described below, e.g. removed by grinding, so that a flat bottom of the sheet 20 'and the perforated disc 20 is present.
  • the at least one spray-discharge opening 34 is introduced after the reduction in thickness by stamping off or passing through in a further method step in the region 33 of the sheet 20 '. Thereafter, the sheet 20 'is finished until the perforated disc 20 with their predetermined Outside dimensions is present. However, the perforated disc 20 can also be provided with the desired external dimensions prior to introduction of the ejection openings 34, for example, by punching them from the metal sheet 20 'or the like. is isolated.
  • the introduction of the at least one spray-discharge opening 34 takes place by means of stamping, erosion or laser drilling.
  • FIG. 1 By way of example, a cup-shaped perforated disc 20 mounted on the fuel injection valve is shown, which can be installed in a particularly secure and reliable manner due to its holder end 26.
  • the method steps according to the invention for producing a perforated disk 20 are by no means limited to such geometric designs of perforated disks 20. Rather, completely flat or otherwise bent perforated disks 20 can be reduced according to the invention in a region 33 in terms of their thickness.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zur Herstellung und Befestigung einer Lochscheibe nach der Gattung des Hauptanspruchs.The invention is based on a method for producing and fixing a perforated disc according to the preamble of the main claim.

Aus der DE 41 21 310 A1 ist bereits ein Brennstoffeinspritzventil bekannt, das einen Ventilsitzkörper besitzt, an dem ein fester Ventilsitz ausgebildet ist. Mit diesem im Ventilsitzkörper ausgebildeten Ventilsitz wirkt ein im Einspritzventil axial beweglicher Ventilschließkörper zusammen. An den Ventilsitzkörper schließt sich in stromabwärtiger Richtung eine flache Düsenrichtplatte an, in der dem Ventilsitz zugewandt eine H-förmige Vertiefung als Einlassbereich vorgesehen ist. An den H-förmigen Einlassbereich schließen sich in stromabwärtiger Richtung vier Abspritzlöcher an, so dass sich ein abzuspritzender Brennstoff über den Einlassbereich bis hin zu den Abspritzlöchern verteilen kann. Eine Beeinflussung der Strömungsgeometrie in der Düsenrichtplatte durch den Ventilsitzkörper soll dabei nicht erfolgen. Vielmehr ist ein Strömungsdurchlass stromabwärts des Ventilsitzes im Ventilsitzkörper so weit ausgeführt, dass der Ventilsitzkörper keinen Einfluss auf die Öffnungsgeometrie der Düsenrichtplatte hat.From the DE 41 21 310 A1 A fuel injection valve is already known which has a valve seat body on which a fixed valve seat is formed. With this valve seat formed in the valve seat body acts in the injection valve axially movable valve closing body together. The valve seat body is adjoined in the downstream direction by a flat nozzle straightening plate in which an H-shaped depression facing the valve seat is provided as the inlet region. Four injection ports are connected to the H-shaped inlet region in the downstream direction, so that a fuel to be sprayed can be distributed over the inlet region as far as the spray-discharge holes. An influence of the flow geometry in the nozzle orifice plate through the valve seat body should not occur. Instead, a flow passage downstream of the valve seat in the valve seat body is designed so far that the valve seat body has no influence on the opening geometry of the nozzle guide plate.

Aus der DE 4 221 185 A ist bereits ein Verfahren zur Herstellung und Befestigung einer Lochscheibe für ein Brennstoffeinspritzventil bekannt.From the DE 4 221 185 A A method for producing and fixing a perforated disc for a fuel injection valve is already known.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zur Herstellung und Befestigung einer Lochscheibe mit den Merkmalen des Hauptanspruchs hat den Vorteil, dass auf einfache Art und Weise besonders geringe Lochscheibenstärken bzw. -dicken erzielbar sind. Da erfindungsgemäß die Abspritzöffnungen im dickenreduzierten mittleren Bereich der Lochscheibe eingebracht werden, ist es möglich, unter Beibehaltung bekannter und üblicher Verhältnisse von Länge zu Durchmesser jeder einzelnen Abspritzöffnung, eine Vielzahl von Abspritzöffnungen mit sehr geringen Spritzlochdurchmessern in der Lochscheibe auszuformen. In der Konsequenz garantiert eine erfindungsgemäß hergestellte und an einem Brennstoffeinspritzventil angebaute Lochscheibe eine gleichmäßige Feinstzerstäubung des Brennstoffs, wobei eine besonders hohe Zerstäubungsgüte und eine an die jeweiligen Erfordernisse angepasste Strahlformung erzielt wird.The inventive method for producing and fixing a perforated disc having the features of the main claim has the advantage that in a simple manner particularly low perforated disc thicknesses or thicknesses can be achieved. Since, according to the invention, the ejection openings are introduced in the thickness-reduced middle region of the orifice plate, it is possible, while maintaining known and customary ratios of length to diameter, to form a plurality of injection orifices with very small injection orifice diameters in the perforated disc. As a consequence, a perforated disk produced according to the invention and attached to a fuel injection valve guarantees a uniform atomization of the fuel, a particularly high degree of atomization being achieved and jet shaping adapted to the respective requirements.

Das zur Dickenreduzierung der Lochscheibe angewendete Abprägen bzw. Durchstellen kann in vorteilhafter Weise mit geringem Kostenaufwand zur Ausformung von Lochscheiben in sehr großen Stückzahlen zum Einsatz kommen.The stamping or punching applied to the thickness reduction of the perforated disk can advantageously be used in very large numbers for the production of perforated disks at low cost.

In besonders vorteilhafter Weise wird die erfindungsgemäß hergestellte Lochscheibe derart an einem Brennstoffeinspritzventil montiert, dass die stromabwärts eines Ventilsitzes angeordnete Lochscheibe eine Öffnungsgeometrie für einen vollständigen axialen Durchgang des Brennstoffs aufweist, die durch einen den festen Ventilsitz umfassenden Ventilsitzkörper begrenzt wird. Damit übernimmt der Ventilsitzkörper bereits die Funktion einer Strömungsbeeinflussung in der Lochscheibe. In besonders vorteilhafter Weise wird ein S-Schlag in der Strömung zur Zerstäubungsverbesserung des Brennstoffs erreicht, da der Ventilsitzkörper mit einer unteren Stirnseite die Abspritzöffnungen der Lochscheibe überdeckt.In a particularly advantageous manner, the perforated disc produced according to the invention is mounted on a fuel injection valve such that the perforated disc arranged downstream of a valve seat has an opening geometry for a complete axial passage of the fuel, which is bounded by a valve seat body comprising the fixed valve seat. Thus, the valve seat body already takes over the function of a flow influencing in the perforated disc. In a particularly advantageous manner, an S-blow is achieved in the flow for atomization improvement of the fuel, as the Valve seat body covered with a lower end face the spray openings of the perforated disc.

Der durch die geometrische Anordnung von Ventilsitzkörper und Lochscheibe erzielte S-Schlag in der Strömung erlaubt die Ausbildung bizarrer Strahlformen mit einer hohen Zerstäubungsgüte. Die Lochscheiben ermöglichen in Verbindung mit entsprechend ausgeführten Ventilsitzkörpern für Ein-, Zwei- und Mehrstrahlsprays Strahlquerschnitte in unzähligen Varianten. Mit einem solchen Brennstoffeinspritzventil kann die Abgasemission der Brennkraftmaschine reduziert und ebenso eine Verringerung des Brennstoffverbrauchs erzielt werden.The achieved by the geometric arrangement of valve seat body and perforated disc S-blow in the flow allows the formation of bizarre beam shapes with a high Zerstäubungsgüte. The perforated discs, in conjunction with correspondingly designed valve seat bodies for single, dual and multi-jet sprays, enable beam cross sections in innumerable variations. With such a fuel injection valve, the exhaust emission of the engine can be reduced and also a reduction in fuel consumption can be achieved.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim method are possible.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes Einspritzventil mit einer Lochscheibe stromabwärts des Ventilsitzkörpers, Figur 2 das Ventilsitzteil bestehend aus Ventilsitzkörper und Lochscheibe in einer vergrößerten Darstellung und Figur 3 schematisch den Verfahrensschritt des Abprägens bzw. des Durchstellens.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 a partially illustrated injection valve with a perforated disc downstream of the valve seat body, FIG. 2 the valve seat part consisting of valve seat body and perforated disc in an enlarged view and FIG. 3 schematically the process step of embossing or enforcing.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist ein Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Einspritzventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsöffnung 3 ausgebildet ist. In der Längsöffnung 3 ist eine z. B. rohrförmige Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende 6 mit einem z. B. kugelförmigen Ventilschließkörper 7, an dessen Umfang beispielsweise fünf Abflachungen 8 zum Vorbeiströmen des Brennstoffs vorgesehen sind, fest verbunden ist.In the FIG. 1 a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignited internal combustion engines is partially shown. The injection valve has a tubular valve seat carrier 1, in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2 is. In the longitudinal opening 3 is a z. B. tubular valve needle 5, which at its downstream end 6 with a z. B. spherical valve-closing body 7, at the periphery of which, for example, five flats 8 are provided for flowing past the fuel, is firmly connected.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise, beispielsweise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen entgegen der Federkraft einer nicht dargestellten Rückstellfeder bzw. Schließen des Einspritzventils dient ein schematisch angedeuteter elektromagnetischer Kreis mit einer Magnetspule 10, einem Anker 11 und einem Kern 12. Der Anker 11 ist mit dem dem Ventilschließkörper 7 abgewandten Ende der Ventilnadel 5 durch z. B. eine mittels eines Lasers ausgebildete Schweißnaht verbunden und auf den Kern 12 ausgerichtet.The actuation of the injection valve takes place in a known manner, for example electromagnetically. For axial movement of the valve needle 5 and thus to open against the spring force of a return spring or closing the injector, not shown, is a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12. The armature 11 is connected to the valve closing body. 7 opposite end of the valve needle 5 by z. B. connected by means of a laser weld and aligned with the core 12.

Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 15 eines Ventilsitzkörpers 16, der in das stromabwärts liegende, dem Kern 12 abgewandte Ende des Ventilsitzträgers 1 in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsöffnung 3 durch Schweißen dicht montiert ist. An seiner dem Ventilschließkörper 7 abgewandten, unteren Stirnseite 17 ist der Ventilsitzkörper 16 mit einer z. B. topfförmig ausgebildeten Lochscheibe 20 konzentrisch und fest verbunden. Die Lochscheibe 20 ist mit einem Bodenteil 24 und einem Halterand 26 ausgeführt. Der Halterand 26 erstreckt sich in axialer Richtung dem Ventilsitzkörper 16 abgewandt und ist bis zu seinem Ende hin konisch nach außen gebogen. Die Verbindung von Ventilsitzkörper 16 und Lochscheibe 20 erfolgt beispielsweise durch eine umlaufende und dichte, mittels eines Lasers ausgebildete erste Schweißnaht 25 in einem äußeren Ringbereich des Bodenteils 24. Aus Gründen der Dauerfestigkeit des Einspritzventils sollte die Lochscheibe 20 in diesem Befestigungsbereich eine Dicke von wenigstens 0,2 mm aufweisen. Die Lochscheibe 20 ist im Bereich des Halterandes 26 des weiteren mit der Wandung der Längsöffnung 3 im Ventilsitzträger 1 beispielsweise durch eine umlaufende und dichte zweite Schweißnaht 30 verbunden.To guide the valve closing body 7 during the axial movement is a guide opening 15 of a valve seat body 16, which is mounted in the downstream, the core 12 remote from the end of the valve seat support 1 in the concentric with the valve longitudinal axis 2 extending longitudinal opening 3 by welding tight. On its side facing away from the valve closing body 7, lower end face 17 of the valve seat body 16 with a z. B. pot-shaped perforated disc 20 concentrically and firmly connected. The perforated disc 20 is designed with a bottom part 24 and a retaining edge 26. The retaining edge 26 extends in the axial direction facing away from the valve seat body 16 and is bent conically outward to its end. The connection of valve seat body 16 and perforated disc 20, for example, by a circumferential and dense, formed by a laser first weld 25 in an outer annular region of the bottom part 24. For reasons of fatigue strength of the injector, the perforated disc should 20 in this mounting area have a thickness of at least 0.2 mm. The perforated disc 20 is connected in the region of the retaining edge 26 of the other with the wall of the longitudinal opening 3 in the valve seat carrier 1, for example by a circumferential and dense second weld 30.

Ein mittlerer Bereich 33 des Bodenteils 24 der Lochscheibe 20 ist erfindungsgemäß dickenreduziert gegenüber dem äußeren Ringbereich des Bodenteils 24 bzw. gegenüber dem Halterand 26. Wenigstens eine, idealerweise jedoch eine Vielzahl von Abspritzöffnungen 34 ist in diesem mittleren Bereich 33 eingebracht. Die Abspritzöffnungen 34 befinden sich in vorteilhafter Weise dabei im äußeren Randbereich des dickenreduzierten mittleren Bereichs 33, der z.B. kreisförmig ausgebildet ist, so dass die untere Stirnseite 17 des Ventilsitzkörpers 16 die Abspritzöffnungen 34 überdeckt, wodurch die Brennstoffströmung stromabwärts des Ventilsitzes 29 zwischen einer Austrittsöffnung 31 im Ventilsitzkörper 16 und den Abspritzöffnungen 34 in der Lochscheibe 20 einen jeweils S-förmigen Verlauf nimmt.According to the invention, a middle region 33 of the bottom part 24 of the perforated disc 20 is reduced in thickness relative to the outer annular region of the bottom part 24 or opposite the retaining edge 26. At least one, but ideally a plurality of spray-discharge openings 34 is introduced in this central region 33. The injection openings 34 are advantageously located in the outer edge area of the thickness-reduced middle area 33, which is e.g. is formed circular, so that the lower end face 17 of the valve seat body 16 covers the ejection openings 34, whereby the fuel flow downstream of the valve seat 29 between an outlet opening 31 in the valve seat body 16 and the ejection openings 34 in the perforated disc 20 takes a respective S-shaped course.

Die Einschubtiefe des aus Ventilsitzkörper 16 und topfförmiger Lochscheibe 20 bestehenden Ventilsitzteils in die Längsöffnung 3 bestimmt die Größe des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an dem sich stromabwärts konisch verjüngenden Ventilsitz 29 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar. Der Ventilschließkörper 7 wirkt mit dem Ventilsitz 29 zusammen.The insertion depth of the consisting of valve seat body 16 and cup-shaped perforated disc 20 valve seat part in the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 in non-energized solenoid 10 by the system of the valve closing body 7 at the downstream conically tapered valve seat 29 of the valve seat body 16 is fixed. The other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke. The valve closing body 7 cooperates with the valve seat 29.

Der Ventilsitzkörper 16 ist mit seiner unteren Austrittsöffnung 31 derart ausgeformt, dass die untere Stirnseite 17 des Ventilsitzkörpers 16 teilweise eine obere Abdeckung eines durch die Vertiefung im mittleren Bereich 33 der Lochscheibe 20 entstehenden Einlassbereichs 40 der Lochscheibe 20 bildet und somit die Eintrittsfläche des Brennstoffs in die Lochscheibe 20 festlegt. Bei dem in der Figur 1 dargestellten Ausführungsbeispiel besitzt die Austrittsöffnung 31 einen kleineren Durchmesser als den Durchmesser eines gedachten Kreises, auf dem die Abspritzöffnungen 34 der Lochscheibe 20 liegen. Aufgrund des radialen Versatzes der Abspritzöffnungen 34 gegenüber der Austrittsöffnung 31 ergibt sich ein S-förmiger Strömungsverlauf des Mediums, hier des Brennstoffs, zu jeder einzelnen Abspritzöffnung 34 hin, der in Figur 2 mit Pfeilen 36 kenntlich gemacht ist.The valve seat body 16 is formed with its lower outlet opening 31 such that the lower Front side 17 of the valve seat body 16 partially forms an upper cover of an emerging through the recess in the central region 33 of the perforated disc 20 inlet portion 40 of the perforated disc 20 and thus defines the entrance surface of the fuel in the perforated disc 20. In the in the FIG. 1 illustrated embodiment, the outlet opening 31 has a smaller diameter than the diameter of an imaginary circle on which the ejection openings 34 of the perforated disc 20 are located. Due to the radial offset of the spray openings 34 with respect to the outlet opening 31 results in an S-shaped flow pattern of the medium, here the fuel, to each injection port 34 out, in FIG. 2 indicated by arrows 36.

Durch den sogenannten S-Schlag innerhalb der Lochscheibe 20 mit mehreren starken Strömungsumlenkungen wird der Strömung eine starke, zerstäubungsfördernde Turbulenz aufgeprägt. Der Geschwindigkeitsgradient quer zur Strömung ist dadurch besonders stark ausgeprägt. Er ist ein Ausdruck für die Änderung der Geschwindigkeit quer zur Strömung, wobei die Geschwindigkeit in der Mitte der Strömung deutlich größer ist als in der Nähe der Wandungen. Die aus den Geschwindigkeitsunterschieden resultierenden erhöhten Scherspannungen im Fluid begünstigen den Zerfall in feine Tröpfchen nahe der Abspritzöffnungen 34. Da die Strömung im Auslass aufgrund der aufgeprägten Radialkomponente einseitig abgelöst ist, erfährt sie wegen fehlender Konturführung keine Strömungsberuhigung. Eine besonders hohe Geschwindigkeit weist das Fluid an der abgelösten Seite auf. Die zerstäubungsfördernden Turbulenzen und Scherspannungen werden somit im Austritt nicht vernichtet. Durch den S-Schlag wird in dem Fluid eine hochfrequente Turbulenz erzeugt, welche den Strahl unmittelbar nach Austritt aus der Lochscheibe 20 in entsprechend feine Tröpfchen zerfallen lässt.Due to the so-called S-impact within the perforated disc 20 with several strong flow deflections of the flow is a strong, atomization promoting turbulence impressed. The velocity gradient across the flow is thus particularly pronounced. It is an expression of the change in the velocity across the stream, with the velocity in the middle of the flow much greater than that in the vicinity of the walls. The resulting from the differences in speed increased shear stresses in the fluid favor the disintegration into fine droplets near the spray openings 34. Since the flow in the outlet is detached on one side due to the impressed radial component, it undergoes no flow calming due to lack of contour guidance. A particularly high speed has the fluid on the detached side. The sputtering turbulences and shear stresses are thus not destroyed in the exit. Due to the S-blow, a high-frequency turbulence is generated in the fluid, which causes the jet to disintegrate into correspondingly fine droplets immediately after emerging from the perforated disk 20.

In Figur 2 ist das aus dem Ventilsitzkörper 16 und der Lochscheibe 20 gebildete Ventilteil in einer vergrößerten Darstellung gezeigt, um den S-förmigen Strömungsverlauf, gekennzeichnet mit Pfeilen 36, zu jeder Abspritzöffnung 34 hin deutlich zu machen. Figur 3 zeigt schematisch den Verfahrensschritt des Abprägens.In FIG. 2 the valve member formed from the valve seat body 16 and the perforated disc 20 is shown in an enlarged view in order to make clear the S-shaped flow pattern, marked with arrows 36, to each spray opening 34 out. FIG. 3 schematically shows the process step of embossing.

In einem ersten nicht dargestellten Verfahrensschritt wird ein flaches metallisches Blech 20' mit einer konstanter Dicke bereitgestellt. Dieses Blech 20' weist beispielsweise eine Dicke von ca. 0,2 mm auf, die auch nach Anwendung der erfindungsgemäßen Verfahrensschritte außerhalb des Bereichs 33 beibehalten bleibt. Bei dem Blech 20' handelt es sich beispielsweise um einen Edelstahlwerkstoff, wie 1.4404, 1.4301 oder SUS304, mit einer Zugfestigkeit von 500 bis 700 N/mm2 und einer Ausgangshärte von 160+/-15 HV. Aus Gründen der Dauerfestigkeit des Brennstoffeinspritzventils sollte die Lochscheibe 20 zumindest in ihrem Ringbereich des Bodenteils 24, in dem die Befestigung der Lochscheibe 20 am Ventilsitzkörper 16 mittels der Schweißnaht 25 vorgesehen ist, eine Mindestdicke von 0,2 mm aufweisen. Um das Verhältnis von Länge zu Durchmesser jeder einzelnen Abspritzöffnung 34 strömungstechnisch optimal einzuhalten, sind bei vorgegebener Mindestdicke die Spritzlochdurchmesser ebenfalls mit einem Mindestwert weitgehend vorgegeben. Soll nun eine Vielzahl von Abspritzöffnungen 34 mit sehr geringen Spritzlochdurchmessern z.B. kleiner als 0,2 mm in der Lochscheibe 20 aus Gründen verbesserter Zerstäubung und Sprayaufbereitung ausgeformt werden, ist es von Vorteil, im Bereich 33 der Abspritzöffnungen 34 eine Dickenreduzierung am Blech 20', aus dem die spätere Lochscheibe 20 geformt ist, vorzunehmen.In a first process step, not shown, a flat metallic sheet 20 'with a constant thickness is provided. This sheet 20 ', for example, has a thickness of about 0.2 mm, which remains maintained even after application of the method steps according to the invention outside the range 33. The sheet 20 'is, for example, a stainless steel material, such as 1.4404, 1.4301 or SUS304, with a tensile strength of 500 to 700 N / mm 2 and an initial hardness of 160 +/- 15 HV. For reasons of fatigue strength of the fuel injection valve, the perforated disc 20 should at least in its annular region of the bottom part 24, in which the attachment of the perforated disc 20 is provided on the valve seat body 16 by means of the weld 25, have a minimum thickness of 0.2 mm. In order to optimally maintain the ratio of length to diameter of each individual spray opening 34 in terms of flow, the spray hole diameters are also largely predetermined with a minimum value for a given minimum thickness. If now a plurality of spray openings 34 are formed with very small spray hole diameters, for example less than 0.2 mm in the perforated disc 20 for reasons of improved atomization and spray treatment, it is advantageous in the region 33 of the spray openings 34, a thickness reduction on the sheet 20 ', from the later perforated disc 20 is formed to make.

In einem weiteren Verfahrensschritt erfolgt eine Dickenreduzierung durch Abprägen, wodurch eine Vertiefung 40' im Blech 20' gebildet wird (Figur 3). Diese Vertiefung 40' weist z.B. eine kegelstumpfförmig geneigte oder zylindrische Begrenzungswand auf. Die mittels Abprägen vorgenommene Dickenreduzierung im Bereich 33 kann ca. 0,05 mm bis 0,1 mm betragen bei einer Ausgangsdicke des Blechs 20' von 0,12 mm bis 0,25 mm. Symbolhaft ist in Figur 3 ein Prägewerkzeug 41 angedeutet. Beim Abprägen wird eine plastische Deformation vorgenommen und Material des Blechs 20' verschoben und geringfügig auf der Eingriffsseite des Prägewerkzeugs 41 um die Vertiefung 40' herum aufgeworfen. Dieses verschobene Material kann auf einfache Weise in einem Walzvorgang verteilt werden. Durch dieses Walzen bzw. auch "Stempeln" genannte Verfahren wird der Aufwurf um den abgeprägten Bereich 33 herum gleichmäßig radial nach außen verteilt, was zu einer geringfügigen Dickenzunahme im Bereich unmittelbar außerhalb des abgeprägten Bereichs 33 führt.In a further method step, a reduction in thickness is achieved by stamping, whereby a recess 40 'is formed in the sheet 20' ( FIG. 3 ). This recess 40 'has, for example, a frusto-conical inclined or cylindrical boundary wall on. The reduction in thickness in the area 33 made by stamping may be about 0.05 mm to 0.1 mm with an initial thickness of the sheet 20 'of 0.12 mm to 0.25 mm. Symbolic is in FIG. 3 an embossing tool 41 indicated. When stamping a plastic deformation is made and moved material of the sheet 20 'and slightly raised on the engaging side of the stamping tool 41 around the recess 40' around. This shifted material can be easily distributed in a rolling process. By means of this rolling or "stamping" method, the layup is distributed uniformly radially outwards around the embossed region 33, which leads to a slight increase in thickness in the region immediately outside the embossed region 33.

Alternativ zum Abprägen kann die Dickenreduzierung des Blechs 20' im Bereich 33, in dem die Abspritzöffnungen 34 angeordnet werden, auch durch das so genannte Durchstellen (engl. Embossing) realisiert werden. Dabei handelt es sich um einen tiefziehähnlichen Stanz-Biege-Vorgang als eine weitere Möglichkeit der Kaltverformung eines Metalls. Insbesondere ist das Durchstellen zur Ausformung des Einlassbereichs 40 der Lochscheibe 20 geeignet, wenn die Härte des zu verformenden Materials größer oder wesentlich größer als 160 HV ist. Beim Durchstellen wird Material auf der der Eingriffsseite des Durchstellwerkzeugs 41' abgewandten Unterseite des Blechs 20' herausgeschoben. Dieses überstehende Material wird nachfolgend z.B. mittels Schleifen wieder entfernt, so dass eine ebene Unterseite des Blechs 20' bzw. der Lochscheibe 20 vorliegt.As an alternative to embossing, the reduction in thickness of the sheet metal 20 'in the area 33 in which the ejection openings 34 are arranged can also be realized by so-called embossing. It is a deep-drawing-like punching-bending process as another way of cold forming a metal. In particular, the passage through to the formation of the inlet region 40 of the perforated disc 20 is suitable if the hardness of the material to be deformed is greater than or substantially greater than 160 HV. When passing through material on the engagement side of the punch-through tool 41 'facing away underside of the sheet 20' is pushed out. This supernatant material will be described below, e.g. removed by grinding, so that a flat bottom of the sheet 20 'and the perforated disc 20 is present.

Die wenigstens eine Abspritzöffnung 34 wird nach der Dickenreduzierung durch Abprägen bzw. Durchstellen in einem weiteren Verfahrensschritt im Bereich 33 des Blechs 20' eingebracht. Danach wird das Blech 20' derart endbearbeitet bis die Lochscheibe 20 mit ihren vorgegebenen Außenabmessungen vorliegt. Die Lochscheibe 20 kann allerdings auch bereits vor dem Einbringen der Abspritzöffnungen 34 mit den gewünschten Außenmaßen versehen werden, indem sie beispielsweise aus dem Blech 20' durch Ausstanzen, Ausschneiden o.ä. vereinzelt wird. Das Einbringen der wenigstens einen Abspritzöffnung 34 erfolgt mittels Stanzen, Erodieren oder Laserbohren.The at least one spray-discharge opening 34 is introduced after the reduction in thickness by stamping off or passing through in a further method step in the region 33 of the sheet 20 '. Thereafter, the sheet 20 'is finished until the perforated disc 20 with their predetermined Outside dimensions is present. However, the perforated disc 20 can also be provided with the desired external dimensions prior to introduction of the ejection openings 34, for example, by punching them from the metal sheet 20 'or the like. is isolated. The introduction of the at least one spray-discharge opening 34 takes place by means of stamping, erosion or laser drilling.

Wie oben bereits ausführlich beschrieben, erfolgt abschließend die erfindungsgemäße Befestigung der Lochscheibe 20 in der Weise, dass die Abspritzöffnungen 34 S-förmig angeströmt werden, da Material des Ventilsitzkörpers 16 im montierten Zustand der Lochscheibe 20 die Abspritzöffnungen 34 radial nach innen überragt.As already described in detail above, finally, the attachment according to the invention of the perforated disc 20 in such a way that the injection openings 34 are flowed in an S-shape, since material of the valve seat body 16 in the assembled state of the perforated disc 20, the spray openings 34 projects radially inwardly.

In Figur 1 ist beispielhaft eine am Brennstoffeinspritzventil montierte topfförmige Lochscheibe 20 gezeigt, die aufgrund ihres Halterndes 26 besonders sicher und zuverlässig verbaubar ist. Die erfindungsgemäßen Verfahrensschritte zur Herstellung einer Lochscheibe 20 sind jedoch keineswegs auf solche geometrischen Ausführungen von Lochscheiben 20 begrenzt. Vielmehr sind auch vollständig flache oder anderweitig abgebogene Lochscheiben 20 in einem Bereich 33 in ihrer Dicke erfindungsgemäß reduzierbar.In FIG. 1 By way of example, a cup-shaped perforated disc 20 mounted on the fuel injection valve is shown, which can be installed in a particularly secure and reliable manner due to its holder end 26. However, the method steps according to the invention for producing a perforated disk 20 are by no means limited to such geometric designs of perforated disks 20. Rather, completely flat or otherwise bent perforated disks 20 can be reduced according to the invention in a region 33 in terms of their thickness.

Claims (7)

  1. Method for producing and fixing a perforated disc (20) for a fuel injection valve for fuel injection systems of internal combustion engines, the perforated disc (20) having such an opening contour that complete passage of a fluid is ensured,
    comprising the method steps of:
    a) providing a flat metallic sheet (20') of a constant thickness,
    b) reducing the thickness in a region (33) of the sheet (20') by means of stamping or forcing through,
    c) introducing at least one spray orifice (34) in the region (33) of reduced thickness,
    d) machining the sheet (20') until a perforated disc (20) with predetermined outer dimensions is achieved,
    e) fixing the perforated disc (20) on a valve seat body (16) of the fuel injection valve in such a way that said body protrudes with a lower end face (17) over an inlet region (40) of the perforated disc (20), created by the thickness reduction, in such a way that the at least one spray orifice (34) is covered.
  2. Method according to Claim 1, characterized in that the sheet (20') provided for the stamping consists of a material with a tensile strength of 500 to 700 N/mm2 and a hardness of 160+/-15 HV.
  3. Method according to Claim 1 or 2, characterized in that the material thrown up on the sheet (20') by the stamping on the engagement side of a stamping tool (41) is distributed by means of rolling.
  4. Method according to Claim 1, characterized in that the sheet (20') provided for the forcing through consists of a material with a hardness greater than 160 HV.
  5. Method according to Claim 1 or 4, characterized in that the material pushed out by the forcing through on the underside of the sheet (20') facing away from the engagement side of a forcing-through tool (41') is removed by means of grinding.
  6. Method according to one of the preceding claims, characterized in that a thickness reduction in the region (33) by 0.05 mm to 0.1 mm is performed by means of stamping or forcing through.
  7. Method according to Claim 1, characterized in that the introduction of the at least one spray orifice (34) is performed by means of punching, eroding or laser drilling.
EP04707869A 2003-04-01 2004-02-04 Method for producing and fixing a perforated disk Expired - Lifetime EP1613857B1 (en)

Applications Claiming Priority (2)

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DE10314670A DE10314670A1 (en) 2003-04-01 2003-04-01 Process for manufacturing and fastening a perforated disc
PCT/DE2004/000178 WO2004088124A1 (en) 2003-04-01 2004-02-04 Method for producing and fixing a perforated disk

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EP1613857A1 EP1613857A1 (en) 2006-01-11
EP1613857B1 true EP1613857B1 (en) 2008-10-15

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EP (1) EP1613857B1 (en)
JP (1) JP4510804B2 (en)
CN (1) CN100523478C (en)
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WO (1) WO2004088124A1 (en)

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JP4592793B2 (en) * 2008-09-25 2010-12-08 三菱電機株式会社 Fuel injection valve
US8341631B2 (en) * 2009-04-10 2012-12-25 Open Invention Network Llc System and method for application isolation
DE102012211665A1 (en) * 2011-08-18 2013-02-21 Robert Bosch Gmbh Valve for a flowing fluid
JP6338662B2 (en) * 2014-06-10 2018-06-06 日立オートモティブシステムズ株式会社 Fuel injection valve
CN110541780A (en) * 2019-09-23 2019-12-06 南岳电控（衡阳）工业技术股份有限公司 Methanol ejector nozzle structure

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CN1771391A (en) 2006-05-10
DE10314670A1 (en) 2004-10-14
US20070007366A1 (en) 2007-01-11
CN100523478C (en) 2009-08-05
JP2006522253A (en) 2006-09-28
JP4510804B2 (en) 2010-07-28
EP1613857A1 (en) 2006-01-11
DE502004008268D1 (en) 2008-11-27
WO2004088124A1 (en) 2004-10-14

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