EP1114249B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1114249B1
EP1114249B1 EP00951262A EP00951262A EP1114249B1 EP 1114249 B1 EP1114249 B1 EP 1114249B1 EP 00951262 A EP00951262 A EP 00951262A EP 00951262 A EP00951262 A EP 00951262A EP 1114249 B1 EP1114249 B1 EP 1114249B1
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EP
European Patent Office
Prior art keywords
fuel injection
valve
injection valve
connection part
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP00951262A
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German (de)
French (fr)
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EP1114249A1 (en
Inventor
Ferdinand Reiter
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • a Fuel injector known to be very slim is executed, for example, with the spray side Valve end in an intake manifold of an internal combustion engine protrude.
  • the electromagnetically actuated valve is characterized by the fact that both a valve seat support as well as a valve needle are elongated. So the spray point of the valve is set far ahead, with which a very targeted spraying is possible.
  • a den Anchor and connecting the valve closing body The connecting part of the valve needle is a stamped-bent part executed and has most of its axial Extend an open, circular cross-section deviating profile.
  • the valve seat support is as sleeve-shaped, thin-walled component.
  • EP 0 690 224 A1 describes a fuel injection valve known that has a nozzle opening, which in the built Condition of the valve already inside an intake duct lies so that avoiding wall wetting Hosing largely directly onto an inlet valve Internal combustion engine is possible.
  • the fuel injector according to the invention with the characteristic features of the main claim has the Advantage that a simple and inexpensive increased rigidity compared to the known elongated Valves is achieved.
  • a Distortion or kinking of the spray side Valve end prevented.
  • the valve end has a high Resilience against bending and kinking.
  • By the increased Strength of the thin-walled valve seat bracket Connecting part of the invention Fuel injector it is possible to use one Fuel injector also compared to the Intake manifold injection to operate higher system pressures.
  • the fuel injector according to the invention is suitable therefore especially as a so-called Direct fuel injection valve for direct injection of Fuel in a combustion chamber of a mixture compression spark ignition internal combustion engine.
  • connection part It is particularly advantageous to cover the scope of the Connection part several longitudinal recesses in Form the shape of longitudinal beads.
  • Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail.
  • 1 shows a first Embodiment of a designed according to the invention Valve
  • Figure 2 shows a second embodiment of a 3 designed a valve Section through the valve seat support along the line III-III in Figure 1 and Figure 2.
  • the electromagnetic part shown in Figure 1 actuatable valve in the form of a Fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited Internal combustion engines are particularly suitable for direct Injecting fuel into a not shown Combustion chamber.
  • the fuel injector has one of one Magnetic coil 1 surrounding tubular core 2 as a so-called Pole.
  • a bobbin 3 takes a winding Magnetic coil 1 and allows in connection with the core 2 a particularly compact structure of the injection valve in the Magnetic coil area 1.
  • excitable actuators are also suitable instead of an electromagnetic circuit Piezo actuators or magnetostrictive actuators.
  • a valve longitudinal axis 10 With a lower core end 9 of the core 2 is concentric a valve longitudinal axis 10 tightly a tubular metal Intermediate part 12 connected, for example, by welding and partially surrounds the core end 9 axially. Downstream of the Coil body 3 and the intermediate part 12 extends inventive tubular valve seat support 16, the for example, is firmly connected to the intermediate part 12.
  • inventive tubular valve seat support 16 In the serving as a connector and a tubular and thin-walled sleeve valve seat support 16 extends a longitudinal opening 18.
  • a e.g. rod-shaped valve needle 19 which at its downstream End has a valve closing section 21, arranged.
  • the injection valve is actuated in a known manner Way e.g. electromagnetically.
  • a return spring 25 or closing the injection valve serves the electromagnetic circuit with the magnetic coil 1, the core 2 and an anchor 26.
  • the anchor 26 is with the Valve closing section 21 facing away from the end of the valve needle 19 connected by a weld seam and onto the core 2 aligned.
  • opposite end of the valve seat support 16 is in the Longitudinal opening 18 through a guide and seat unit Welding tightly assembled.
  • This guide and seat unit comprises three disk-shaped Elements that face each other directly lie.
  • a guide element 27, a swirl element 28 and a Valve seat element 29 follow each other in the downstream direction.
  • the valve seat element 29 projects with a stepped outer contour only partially into the longitudinal opening 18 into it.
  • the valve seat element 29 firmly and tightly with the Valve seat support 16 on its downstream end face connected.
  • the guide element 27, the swirl element 28 and the valve seat element 29 are also fixed to one another connected, with a weld on the outer circumference of the offers three elements 27, 28 and 29.
  • a guide opening serves along the longitudinal valve axis 10 of the intermediate part 12 and a guide opening in Guide element 27.
  • the downstream e.g. conical tapered valve closing section 21 acts with a tapered in the direction of flow Valve seat surface 32 of the valve seat element 29 together.
  • the illustrated embodiment is the outlet opening 33 inclined to the valve longitudinal axis 10, which in a convex spray area of the Valve seat element 29 ends.
  • the outlet opening 33 fuel flowing through is swirling, because it in front of the Valve seat surface 32 in the swirl element 28 in which for example, several tangential swirl channels are provided, an atomization-improving Swirl component is impressed.
  • valve needle 19 An end position of the valve needle 19 is when it is not excited Solenoid 1 through the installation of the valve closing section 21 fixed to the valve seat surface 32 while the other end position of the valve needle 19 when excited Magnetic coil 1 by the armature 26 resting on the core end 9 of core 2 results.
  • the magnet coil 1 is one Cup-shaped valve housing 35 surround the so-called External pole serves. With its valve seat element 29 facing lower end, the valve housing 35 is firmly on the valve seat support 16 e.g. by means of a weld seam applied.
  • valve seat carrier 16 encloses this axially movable valve part consisting of armature 26 and valve needle 19 with the valve closing section 21 and partially Management and seating unit.
  • the valve seat support 16 is elongated, the valve seat support 16 even half or more of the total axial Extension length of the injector can make up. With this design of the valve seat support 16 can Injection point of the injection valve can be set far ahead what is due to certain internal combustion engines idiosyncratic design and limited installation space may be desirable.
  • the Fuel injection valve as a direct injection valve can the spray point optimally to a desired location of the Combustion chamber.
  • Valve seat support 16 By using the relatively cheap sleeve for the Valve seat support 16 it becomes possible to in Injector valves usual turned parts, due to their larger outer diameter more voluminous and at the Manufacturing are more expensive than the valve seat support 16, too dispense.
  • a Fuel injector with an elongated thin-walled valve seat support 16 there is a certain Risk of bending or kinking the spray side Valve end.
  • Valve seat support 16 With the training of the invention Valve seat support 16, the rigidity is increased, so that in advantageously twisting or kinking the spray-side valve end is prevented.
  • the valve seat support 16 has a number of circumferences distributed shapes that increase rigidity of longitudinal beads 38 on.
  • Figure 3 shows a sectional view a section along the line III-III in Figure 1
  • the axially extending longitudinal beads 38 are e.g. introduced at a distance of 120 ° from each other. A smaller or larger number of is also conceivable Longitudinal beads 38.
  • the longitudinal beads 38 face the actual sleeve shape represents recessed formations that over a considerable part (e.g. as in Figures 1 and 2 represented over approx. 50%) of the axial extension length of the Valve seat support 16 can run.
  • the valve seat support 16 is on the one hand by deep drawing producible or on the other hand from a tube through a Forming process.
  • a tubular Starting body come e.g. hydromechanical or hydrostatic forming processes in question.
  • Magnetic forming is the desired shape of the Valve seat support 16 achievable.
  • sealing element 41 is used for Seal between the circumference of the injector and a valve seat, not shown, in the cylinder head or on an intake line of the internal combustion engine.
  • the Sealing element 41 is e.g. made of a plastic, such as PTFE manufactured.
  • the radial depth of the groove 40 corresponds for example the depth of the longitudinal beads 38.
  • FIG 2 is a second embodiment of a Fuel injector shown that essentially coincides with the valve shown in Figure 1. in the only the differences are explained below.
  • the Valve housing 35 is pot-shaped in this embodiment trained that it is not directly on the valve seat support 16 is present. Rather, below the solenoid 1 is a Magnetic flux closing bottom part 43 is provided with the both the valve housing 35 and the valve seat support 16 is firmly connected.
  • the armature 26 is axial, for example movable on the valve needle 19 between an upper and a lower needle-fixed stop 44 and 45 are arranged. to Avoiding the bouncing of the valve needle 19 when closing of the valve is e.g. between anchor 26 and the lower one Stop 45 introduced a damping element.
  • the guide and seat unit is also minor modified.
  • the guide element 27, the Swirl element 28 and also the valve seat element 29 completely arranged within the longitudinal opening 18.
  • Downstream of the valve seat member 29 is a disk-shaped spray body 46 is provided.
  • the spray body 46 has the outlet opening 33 on.
  • the spray body 46 and the valve seat element 29 are e.g. via a weld seam achieved by means of laser welding firmly connected, the welding in one annular circumferential recess 47 is made.
  • the Spray body 46 is also fixed by a weld connected to the valve seat support 16.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention is based on a fuel injector according to the genus of the main claim.

Aus der DE 196 32 196 A1 ist bereits ein Brennstoffeinspritzventil bekannt, das sehr schlank ausgeführt ist, um beispielsweise mit dem abspritzseitigen Ventilende in ein Saugrohr einer Brennkraftmaschine hineinzuragen. Das elektromagnetisch betätigbare Ventil zeichnet sich dadurch aus, dass sowohl ein Ventilsitzträger als auch eine Ventilnadel langgestreckt ausgebildet sind. Damit wird der Abspritzpunkt des Ventils weit vorgesetzt, womit ein sehr gezieltes Abspritzen möglich ist. Ein den Anker und den Ventilschließkörper verbindendes Verbindungsteil der Ventilnadel ist als Stanz-Biege-Teil ausgeführt und weist über den größten Teil seiner axialen Erstreckung ein offenes, von einem kreisförmigen Querschnitt abweichendes Profil auf. Der Ventilsitzträger ist als hülsenförmiges, dünnwandiges Bauteil ausgeführt.From DE 196 32 196 A1 is already a Fuel injector known to be very slim is executed, for example, with the spray side Valve end in an intake manifold of an internal combustion engine protrude. The electromagnetically actuated valve is characterized by the fact that both a valve seat support as well as a valve needle are elongated. So the spray point of the valve is set far ahead, with which a very targeted spraying is possible. A den Anchor and connecting the valve closing body The connecting part of the valve needle is a stamped-bent part executed and has most of its axial Extend an open, circular cross-section deviating profile. The valve seat support is as sleeve-shaped, thin-walled component.

Aus der EP 0 690 224 A1 ist ein Brennstoffeinspritzventil bekannt, das eine Düsenöffnung besitzt, die im eingebauten Zustand des Ventils bereits im Inneren eines Ansaugkanals liegt, so dass unter Vermeidung einer Wandbenetzung ein Abspritzen weitgehend direkt auf ein Einlassventil einer Brennkraftmaschine möglich ist. Eine Vorverlagerung des Abspritzpunktes erhöht durch die Verlängerung des massiv ausgebildeten Ventilsitzträgers die Masse und das Volumen des Einspritzventils.EP 0 690 224 A1 describes a fuel injection valve known that has a nozzle opening, which in the built Condition of the valve already inside an intake duct lies so that avoiding wall wetting Hosing largely directly onto an inlet valve Internal combustion engine is possible. An advance of the Spray point increased by the extension of the massive trained valve seat support the mass and volume of the injector.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, dass auf einfache Art und Weise kostengünstig eine erhöhte Steifigkeit gegenüber den bekannten langgestreckten Ventilen erzielt wird. In vorteilhafter Weise wird ein Verwinden oder ein Abknicken des abspritzseitigen Ventilendes verhindert. Das Ventilende besitzt eine hohe Belastbarkeit gegen Biegung und Knickung. Durch die erhöhte Festigkeit des dünnwandigen, als Ventilsitzträger dienenden Anschlussteils des erfindungsgemäßen Brennstoffeinspritzventils ist es möglich, ein solches Brennstoffeinspritzventil auch bei gegenüber der Saugrohreinspritzung höheren Systemdrücken zu betreiben. Das erfindungsgemäße Brennstoffeinspritzventil eignet sich deshalb insbesondere als sogenanntes Benzindirekteinspritzventil zum direkten Einspritzen von Brennstoff in einen Brennraum einer gemischverdichtenden fremdgezündeten Brennkraftmaschine.The fuel injector according to the invention with the characteristic features of the main claim has the Advantage that a simple and inexpensive increased rigidity compared to the known elongated Valves is achieved. Advantageously, a Distortion or kinking of the spray side Valve end prevented. The valve end has a high Resilience against bending and kinking. By the increased Strength of the thin-walled valve seat bracket Connecting part of the invention Fuel injector it is possible to use one Fuel injector also compared to the Intake manifold injection to operate higher system pressures. The The fuel injector according to the invention is suitable therefore especially as a so-called Direct fuel injection valve for direct injection of Fuel in a combustion chamber of a mixture compression spark ignition internal combustion engine.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich. By the measures listed in the subclaims advantageous developments and improvements in Main claim specified fuel injector possible.

Besonders vorteilhaft ist es, über den Umfang des Anschlussteils mehrere längs verlaufende Vertiefungen in Form von Längssicken auszuformen.It is particularly advantageous to cover the scope of the Connection part several longitudinal recesses in Form the shape of longitudinal beads.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Ventils, Figur 2 ein zweites Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Ventils und Figur 3 einen Schnitt durch den Ventilsitzträger entlang der Linie III-III in Figur 1 bzw. Figur 2.Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows a first Embodiment of a designed according to the invention Valve, Figure 2 shows a second embodiment of a 3 designed a valve Section through the valve seat support along the line III-III in Figure 1 and Figure 2.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in der Figur 1 teilweise dargestellte elektromagnetisch betätigbare Ventil in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht gezeigten Brennraum. Das Brennstoffeinspritzventil hat einen von einer Magnetspule 1 umgebenen, rohrförmigen Kern 2 als sogenannten Innenpol. Ein Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht in Verbindung mit dem Kern 2 einen besonders kompakten Aufbau des Einspritzventils im Bereich der Magnetspule 1. Als erregbare Betätigungselemente eignen sich anstelle eines elektromagnetischen Kreises auch Piezoaktoren oder magnetostriktive Aktoren.The electromagnetic part shown in Figure 1 actuatable valve in the form of a Fuel injection valve for fuel injection systems of mixture-compressing, spark-ignited Internal combustion engines are particularly suitable for direct Injecting fuel into a not shown Combustion chamber. The fuel injector has one of one Magnetic coil 1 surrounding tubular core 2 as a so-called Pole. A bobbin 3 takes a winding Magnetic coil 1 and allows in connection with the core 2 a particularly compact structure of the injection valve in the Magnetic coil area 1. As excitable actuators are also suitable instead of an electromagnetic circuit Piezo actuators or magnetostrictive actuators.

Mit einem unteren Kernende 9 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 10 dicht ein rohrförmiges metallenes Zwischenteil 12 beispielsweise durch Schweißen verbunden und umgibt das Kernende 9 teilweise axial. Stromabwärts des Spulenkörpers 3 und des Zwischenteils 12 erstreckt sich ein erfindungsgemäßer rohrförmiger Ventilsitzträger 16, der beispielsweise fest mit dem Zwischenteil 12 verbunden ist. In dem als Anschlussteil dienenden und eine rohrförmige und dünnwandige Hülse darstellenden Ventilsitzträger 16 verläuft eine Längsöffnung 18. In der Längsöffnung 18 ist eine z.B. stangenförmige Ventilnadel 19, die an ihrem stromabwärtigen Ende einen Ventilschließabschnitt 21 aufweist, angeordnet.With a lower core end 9 of the core 2 is concentric a valve longitudinal axis 10 tightly a tubular metal Intermediate part 12 connected, for example, by welding and partially surrounds the core end 9 axially. Downstream of the Coil body 3 and the intermediate part 12 extends inventive tubular valve seat support 16, the for example, is firmly connected to the intermediate part 12. In the serving as a connector and a tubular and thin-walled sleeve valve seat support 16 extends a longitudinal opening 18. In the longitudinal opening 18 a e.g. rod-shaped valve needle 19, which at its downstream End has a valve closing section 21, arranged.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise z.B. elektromagnetisch. Zur axialen Bewegung der Ventilnadel 19 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 25 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2 und einem Anker 26. Der Anker 26 ist mit dem dem Ventilschließabschnitt 21 abgewandten Ende der Ventilnadel 19 durch eine Schweißnaht verbunden und auf den Kern 2 ausgerichtet. In das stromabwärts liegende, dem Kern 2 abgewandte Ende des Ventilsitzträgers 16 ist in der Längsöffnung 18 eine Führungs- und Sitzeinheit durch Schweißen dicht montiert.The injection valve is actuated in a known manner Way e.g. electromagnetically. For the axial movement of the Valve needle 19 and thus to open against the spring force a return spring 25 or closing the injection valve serves the electromagnetic circuit with the magnetic coil 1, the core 2 and an anchor 26. The anchor 26 is with the Valve closing section 21 facing away from the end of the valve needle 19 connected by a weld seam and onto the core 2 aligned. In the downstream core 2 opposite end of the valve seat support 16 is in the Longitudinal opening 18 through a guide and seat unit Welding tightly assembled.

Diese Führungs- und Sitzeinheit umfasst drei scheibenförmige Elemente, die mit ihren Stirnflächen unmittelbar aneinander liegen. In stromabwärtiger Richtung folgen dabei aufeinander ein Führungselement 27, ein Drallelement 28 und ein Ventilsitzelement 29. Während das Führungselement 27 und das Drallelement 28 vollständig innerhalb der Längsöffnung 18 angeordnet sind, ragt das Ventilsitzelement 29 mit einer gestuften Außenkontur nur teilweise in die Längsöffnung 18 hinein. Im Bereich einer nach außen ragenden Schulter 30 ist das Ventilsitzelement 29 fest und dicht mit dem Ventilsitzträger 16 an dessen stromabwärtiger Stirnseite verbunden. Das Führungselement 27, das Drallelement 28 und das Ventilsitzelement 29 sind untereinander ebenfalls fest verbunden, wobei sich eine Schweißnaht am äußeren Umfang der drei Elemente 27, 28 und 29 anbietet.This guide and seat unit comprises three disk-shaped Elements that face each other directly lie. Follow each other in the downstream direction a guide element 27, a swirl element 28 and a Valve seat element 29. While the guide element 27 and the Swirl element 28 completely within the longitudinal opening 18 are arranged, the valve seat element 29 projects with a stepped outer contour only partially into the longitudinal opening 18 into it. In the area of an outwardly projecting shoulder 30 the valve seat element 29 firmly and tightly with the Valve seat support 16 on its downstream end face connected. The guide element 27, the swirl element 28 and the valve seat element 29 are also fixed to one another connected, with a weld on the outer circumference of the offers three elements 27, 28 and 29.

Zur Führung der Ventilnadel 19 während der Axialbewegung entlang der Ventillängsachse 10 dient eine Führungsöffnung des Zwischenteils 12 sowie eine Führungsöffnung im Führungselement 27. Der sich stromabwärts z.B. kegelförmig verjüngende Ventilschließabschnitt 21 wirkt mit einer sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 32 des Ventilsitzelements 29 zusammen. Von der Ventilsitzfläche 32 ausgehend erstreckt sich wenigstens eine Austrittsöffnung 33 durch das Ventilsitzelement 29. Im dargestellten Ausführungsbeispiel ist die Austrittsöffnung 33 schräg geneigt zur Ventillängsachse 10 ausgeführt, die in einem konvex gewölbten Abspritzbereich des Ventilsitzelements 29 endet. Der die Austrittsöffnung 33 durchströmende Brennstoff ist drallbehaftet, da ihm vor der Ventilsitzfläche 32 im Drallelement 28, in dem beispielsweise mehrere tangential verlaufende Drallkanäle vorgesehen sind, eine zerstäubungsverbessernde Drallkomponente aufgeprägt wird.To guide the valve needle 19 during the axial movement A guide opening serves along the longitudinal valve axis 10 of the intermediate part 12 and a guide opening in Guide element 27. The downstream e.g. conical tapered valve closing section 21 acts with a tapered in the direction of flow Valve seat surface 32 of the valve seat element 29 together. Of starting from the valve seat surface 32 extends at least an outlet opening 33 through the valve seat element 29. Im The illustrated embodiment is the outlet opening 33 inclined to the valve longitudinal axis 10, which in a convex spray area of the Valve seat element 29 ends. The outlet opening 33 fuel flowing through is swirling, because it in front of the Valve seat surface 32 in the swirl element 28 in which for example, several tangential swirl channels are provided, an atomization-improving Swirl component is impressed.

Eine Endstellung der Ventilnadel 19 ist bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließabschnitts 21 an der Ventilsitzfläche 32 festgelegt, während sich die andere Endstellung der Ventilnadel 19 bei erregter Magnetspule 1 durch die Anlage des Ankers 26 am Kernende 9 des Kerns 2 ergibt. Die Magnetspule 1 ist von einem topfförmigen Ventilgehäuse 35 umgeben, das als sogenannter Außenpol dient. Mit seinem dem Ventilsitzelement 29 zugewandten unteren Ende ist das Ventilgehäuse 35 fest auf dem Ventilsitzträger 16 z.B. mittels einer Schweißnaht aufgebracht. An end position of the valve needle 19 is when it is not excited Solenoid 1 through the installation of the valve closing section 21 fixed to the valve seat surface 32 while the other end position of the valve needle 19 when excited Magnetic coil 1 by the armature 26 resting on the core end 9 of core 2 results. The magnet coil 1 is one Cup-shaped valve housing 35 surround the so-called External pole serves. With its valve seat element 29 facing lower end, the valve housing 35 is firmly on the valve seat support 16 e.g. by means of a weld seam applied.

Der z. B. aus einem ferritischen, den Magnetfluss leitenden Material bestehende Ventilsitzträger 16 umschließt das axial bewegliche Ventilteil bestehend aus Anker 26 und Ventilnadel 19 mit dem Ventilschließabschnitt 21 sowie teilweise die Führungs- und Sitzeinheit. Der Ventilsitzträger 16 ist langgestreckt ausgeführt, wobei der Ventilsitzträger 16 sogar die Hälfte oder mehr der gesamten axialen Erstreckungslänge des Einspritzventils ausmachen kann. Mit dieser Ausbildung des Ventilsitzträgers 16 kann der Abspritzpunkt des Einspritzventils weit vorgesetzt werden, was bei bestimmten Brennkraftmaschinen aufgrund eigenwilliger Formgebung und begrenzten Bauraums wünschenswert sein kann. Bei Verwendung des Brennstoffeinspritzventils als Direkteinspritzventil kann der Abspritzpunkt so optimal an eine gewünschte Stelle des Brennraums gesetzt werden. Bei üblichen Einbaulagen von Einspritzventilen für die Saugrohreinspritzung bedeutet eine solche Ausführung, dass das Brennstoffeinspritzventil mit seinem stromabwärtigen Ende und damit mit seinem Zumess- und Abspritzbereich deutlich in das Ansaugrohr hineinreicht. Hierdurch kann durch das gezielte Abspritzen auf ein oder mehrere Einlaßventile eine Wandbenetzung des Ansaugrohrs weitgehend vermieden und als Folge daraus die Abgasemission der Brennkraftmaschine reduziert werden.The z. B. from a ferritic, the magnetic flux conductive Material existing valve seat carrier 16 encloses this axially movable valve part consisting of armature 26 and valve needle 19 with the valve closing section 21 and partially Management and seating unit. The valve seat support 16 is elongated, the valve seat support 16 even half or more of the total axial Extension length of the injector can make up. With this design of the valve seat support 16 can Injection point of the injection valve can be set far ahead what is due to certain internal combustion engines idiosyncratic design and limited installation space may be desirable. When using the Fuel injection valve as a direct injection valve can the spray point optimally to a desired location of the Combustion chamber. With the usual installation positions of Injectors for intake manifold injection means one such design that the fuel injector with its downstream end and thus with its metering and Spray area clearly extends into the intake pipe. As a result, targeted spraying on or several inlet valves a wall wetting of the intake pipe largely avoided and, as a result, exhaust emissions the internal combustion engine can be reduced.

Durch den Einsatz der relativ billigen Hülse für den Ventilsitzträger 16 wird es möglich, auf in Einspritzventilen übliche Drehteile, die aufgrund ihres größeren Außendurchmessers voluminöser und bei der Herstellung teurer als der Ventilsitzträger 16 sind, zu verzichten. Bei der Ausbildung eines Brennstoffeinspritzventils mit einem langgestreckten dünnwandigen Ventilsitzträger 16 besteht jedoch eine gewisse Gefahr einer Biegung oder Knickung des abspritzseitigen Ventilendes. Mit der erfindungsgemäßen Ausbildung des Ventilsitzträgers 16 wird die Steifigkeit erhöht, so dass in vorteilhafter Weise ein Verwinden oder ein Abknicken des abspritzseitigen Ventilendes verhindert wird.By using the relatively cheap sleeve for the Valve seat support 16 it becomes possible to in Injector valves usual turned parts, due to their larger outer diameter more voluminous and at the Manufacturing are more expensive than the valve seat support 16, too dispense. When training a Fuel injector with an elongated thin-walled valve seat support 16, however, there is a certain Risk of bending or kinking the spray side Valve end. With the training of the invention Valve seat support 16, the rigidity is increased, so that in advantageously twisting or kinking the spray-side valve end is prevented.

Der Ventilsitzträger 16 weist mehrere über den Umfang verteilte, die Steifigkeit erhöhende Ausformungen in Form von Längssicken 38 auf. Figur 3 zeigt als Schnittdarstellung eines Schnitts entlang der Linie III-III in Figur 1 ein Beispiel eines Ventilsitzträgers 16 mit drei Längssicken 38. Dabei sind die sich axial erstreckenden Längssicken 38 z.B. mit einem Abstand von jeweils 120° voneinander eingebracht. Denkbar ist auch eine kleinere oder größere Anzahl von Längssicken 38. Die Längssicken 38 stellen gegenüber der eigentlichen Hülsenform vertiefte Ausformungen dar, die über einen erheblichen Teil (z.B. wie in den Figuren 1 und 2 dargestellt über ca. 50%) der axialen Erstreckungslänge des Ventilsitzträgers 16 verlaufen können.The valve seat support 16 has a number of circumferences distributed shapes that increase rigidity of longitudinal beads 38 on. Figure 3 shows a sectional view a section along the line III-III in Figure 1 Example of a valve seat support 16 with three longitudinal beads 38. The axially extending longitudinal beads 38 are e.g. introduced at a distance of 120 ° from each other. A smaller or larger number of is also conceivable Longitudinal beads 38. The longitudinal beads 38 face the actual sleeve shape represents recessed formations that over a considerable part (e.g. as in Figures 1 and 2 represented over approx. 50%) of the axial extension length of the Valve seat support 16 can run.

Der Ventilsitzträger 16 ist einerseits durch Tiefziehen herstellbar oder andererseits aus einem Rohr durch einen Umformprozess. Für das Umformen eines rohrförmigen Ausgangskörpers kommen z.B. hydromechanische oder hydrostatische Umformverfahren in Frage. Auch mittels Magnetumformen ist die gewünschte Gestalt des Ventilsitzträgers 16 erzielbar.The valve seat support 16 is on the one hand by deep drawing producible or on the other hand from a tube through a Forming process. For forming a tubular Starting body come e.g. hydromechanical or hydrostatic forming processes in question. Also by means of Magnetic forming is the desired shape of the Valve seat support 16 achievable.

Ein in einer am äußeren Umfang des Ventilsitzträgers 16 eingebrachten Nut 40 angeordnetes Dichtelement 41 dient zur Abdichtung zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme im Zylinderkopf oder an einer Ansaugleitung der Brennkraftmaschine. Das Dichtelement 41 ist z.B. aus einem Kunststoff, wie PTFE hergestellt. Die radiale Tiefe der Nut 40 entspricht beispielsweise der Tiefe der Längssicken 38. One in an on the outer periphery of the valve seat carrier 16 introduced groove 40 arranged sealing element 41 is used for Seal between the circumference of the injector and a valve seat, not shown, in the cylinder head or on an intake line of the internal combustion engine. The Sealing element 41 is e.g. made of a plastic, such as PTFE manufactured. The radial depth of the groove 40 corresponds for example the depth of the longitudinal beads 38.

In Figur 2 ist ein zweites Ausführungsbeispiel eines Brennstoffeinspritzventils dargestellt, das im wesentlichen mit dem in Figur 1 gezeigten Ventil übereinstimmt. Im folgenden werden nur die Unterschiede erläutert. Das Ventilgehäuse 35 ist bei dieser Ausführung derart topfförmig ausgebildet, dass es nicht unmittelbar am Ventilsitzträger 16 anliegt. Vielmehr ist unterhalb der Magnetspule 1 ein den Magnetfluss schließendes Bodenteil 43 vorgesehen, mit dem sowohl das Ventilgehäuse 35 als auch der Ventilsitzträger 16 fest verbunden ist. Der Anker 26 ist beispielsweise axial beweglich auf der Ventilnadel 19 zwischen einem oberen und einem unteren nadelfesten Anschlag 44 und 45 angeordnet. Zur Vermeidung des Prellens der Ventilnadel 19 beim Schließen des Ventils ist z.B. zwischen dem Anker 26 und dem unteren Anschlag 45 ein Dämpfungselement eingebracht.In Figure 2 is a second embodiment of a Fuel injector shown that essentially coincides with the valve shown in Figure 1. in the only the differences are explained below. The Valve housing 35 is pot-shaped in this embodiment trained that it is not directly on the valve seat support 16 is present. Rather, below the solenoid 1 is a Magnetic flux closing bottom part 43 is provided with the both the valve housing 35 and the valve seat support 16 is firmly connected. The armature 26 is axial, for example movable on the valve needle 19 between an upper and a lower needle-fixed stop 44 and 45 are arranged. to Avoiding the bouncing of the valve needle 19 when closing of the valve is e.g. between anchor 26 and the lower one Stop 45 introduced a damping element.

Auch die Führungs- und Sitzeinheit ist geringfügig modifiziert ausgestaltet. Das Führungselement 27, das Drallelement 28 und auch das Ventilsitzelement 29 sind vollständig innerhalb der Längsöffnung 18 angeordnet. Stromabwärts des Ventilsitzelements 29 ist ein scheibenförmiger Abspritzkörper 46 vorgesehen. In diesem Fall weist der Abspritzkörper 46 die Austrittsöffnung 33 auf. Der Abspritzkörper 46 und das Ventilsitzelement 29 sind z.B. über eine mittels Laserschweißen erzielte Schweißnaht fest miteinander verbunden, wobei die Verschweißung in einer ringförmig umlaufenden Vertiefung 47 vorgenommen ist. Der Abspritzkörper 46 ist außerdem durch eine Schweißnaht fest mit dem Ventilsitzträger 16 verbunden.The guide and seat unit is also minor modified. The guide element 27, the Swirl element 28 and also the valve seat element 29 completely arranged within the longitudinal opening 18. Downstream of the valve seat member 29 is a disk-shaped spray body 46 is provided. In this In this case, the spray body 46 has the outlet opening 33 on. The spray body 46 and the valve seat element 29 are e.g. via a weld seam achieved by means of laser welding firmly connected, the welding in one annular circumferential recess 47 is made. The Spray body 46 is also fixed by a weld connected to the valve seat support 16.

Claims (9)

  1. Fuel injection valve, with a fuel inlet, with an excitable actuating device (1, 2, 26, 35) by means of which a valve-closing member (21) can be moved, with a fixed valve seat (32) which is formed on a valve-seat element (29) and with which the valve-closing member (21) cooperates in order to open and close the valve, with a fuel outlet (33) provided downstream of the valve seat (32), and with a sleeve-shaped connection part (16) having an inner longitudinal orifice (18) and receiving the valve-seat element (29), characterized in that the connection part (16) has rigidity-increasing shaped portions (38) in the form of depressions running longitudinally.
  2. Fuel injection valve according to Claim 1, characterized in that the connection part (16) has a largely annular cross section, the shaped portions (38) being depressed from the circular circumference.
  3. Fuel injection valve according to Claim 1 or 2, characterized in that more than one shaped portion (28) is introduced over the circumference of the connection part (16).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the shaped portions are designed as longitudinal beads (38).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that the connection part (16) can be shaped by deep-drawing.
  6. Fuel injection valve according to one of Claims 1 to 4, characterized in that the connection part (16) can be shaped out of a tube by hydromechanical or hydrostatic forming.
  7. Fuel injection valve according to one of Claims 1 to 4, characterized in that the connection part (16) can be shaped out of a tube by magnetic forming.
  8. Fuel injection valve according to one of the preceding claims, characterized in that the connection part (16) consists of a ferritic material conducting the magnetic flux.
  9. Fuel injection valve according to one of the preceding claims, characterized in that the shaped portions (38) extend over approximately half the axial length of extent from the connection part (16).
EP00951262A 1999-07-14 2000-07-13 Fuel injection valve Expired - Lifetime EP1114249B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19932763 1999-07-14
DE19932763A DE19932763A1 (en) 1999-07-14 1999-07-14 Fuel injector
PCT/DE2000/002277 WO2001006113A1 (en) 1999-07-14 2000-07-13 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1114249A1 EP1114249A1 (en) 2001-07-11
EP1114249B1 true EP1114249B1 (en) 2004-10-06

Family

ID=7914650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00951262A Expired - Lifetime EP1114249B1 (en) 1999-07-14 2000-07-13 Fuel injection valve

Country Status (6)

Country Link
US (1) US6494389B1 (en)
EP (1) EP1114249B1 (en)
JP (1) JP2003504558A (en)
CN (1) CN1127615C (en)
DE (2) DE19932763A1 (en)
WO (1) WO2001006113A1 (en)

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Also Published As

Publication number Publication date
DE50008091D1 (en) 2004-11-11
US6494389B1 (en) 2002-12-17
EP1114249A1 (en) 2001-07-11
WO2001006113A1 (en) 2001-01-25
JP2003504558A (en) 2003-02-04
CN1318133A (en) 2001-10-17
DE19932763A1 (en) 2001-01-18
CN1127615C (en) 2003-11-12

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