EP0223018A2 - Electromagnetically actuated fuel injection valve - Google Patents

Electromagnetically actuated fuel injection valve Download PDF

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Publication number
EP0223018A2
EP0223018A2 EP86113334A EP86113334A EP0223018A2 EP 0223018 A2 EP0223018 A2 EP 0223018A2 EP 86113334 A EP86113334 A EP 86113334A EP 86113334 A EP86113334 A EP 86113334A EP 0223018 A2 EP0223018 A2 EP 0223018A2
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EP
European Patent Office
Prior art keywords
fuel injection
spray opening
injection valve
electromagnetically actuated
actuated fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86113334A
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German (de)
French (fr)
Other versions
EP0223018A3 (en
EP0223018B1 (en
Inventor
Andreas Sausner
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.)
Mannesmann VDO AG
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Mannesmann VDO AG
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Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Priority to AT86113334T priority Critical patent/ATE42132T1/en
Publication of EP0223018A2 publication Critical patent/EP0223018A2/en
Publication of EP0223018A3 publication Critical patent/EP0223018A3/en
Application granted granted Critical
Publication of EP0223018B1 publication Critical patent/EP0223018B1/en
Expired legal-status Critical Current

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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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0675—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/06—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves being furnished at seated ends with pintle or plug shaped extensions
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the invention relates to an electromagnetically actuated fuel injection valve for injection systems for internal combustion engines, having a valve housing, a spray opening, a magnetic winding and a closing element which is connected to an armature assigned to the magnetic winding, a pin arranged in the spray opening having a conical region.
  • a well atomized fuel is particularly important for the combustion process in internal combustion engines.
  • Fuel injection valves are already known in which a swirl space is provided, in which the fuel runs tangentially in order to improve the atomization.
  • the maintenance of the swirl within the spray opening is supported by a pin-like extension of the injection needle.
  • Fuel injection valves have also become known in which a pin is provided within the spray opening, which pin can be adjusted axially with the aid of a holding member in order to be able to adjust the fuel metering. There are no special measures to improve atomization.
  • the object of the present invention is to provide an electromagnetically actuated fuel injection valve in which good atomization is ensured.
  • the electromagnetically actuated fuel injection valve according to the invention has the advantage that the fuel layer flowing on the wall of the spray opening is disturbed by particles emanating from the conical part of the pin before reaching the edge, as a result of which the fuel layer flowing along the wall is detached in the form of larger drops is prevented.
  • this results in good atomization of the fuel and at the same time a hollow spray cone.
  • the spray opening is conical in an outer region, the conical regions of the pin and the spray opening can be designed such that the free cross section decreases in the direction of the outer edge of the spray opening.
  • Another development is that the angle formed by the lateral surface and the axis of the conical region of the pin is greater than the opening angle of the conical region of the spray opening. This accelerates the fuel as it flows through the spray opening, which in turn contributes to better atomization.
  • the conical region of the pin is shorter in the axial direction than the conical region of the spray opening.
  • a special embodiment is that the generatrix of the conical region of the pin intersect the lateral surface of the conical region of the spray opening in the vicinity of the outer edge. This ensures that the liquid particles detaching from the surface of the conical part at the edge thereof are thrown by the radial component of their speed or, in the case of the swirl, by centrifugal force in the direction of the edge of the spray opening and disrupt the formation of a closed flow there.
  • the pin can be held in a holding body which has at least one bore.
  • the direction of the hole for generating a swirl can be one have tangential component.
  • the holding body can be arranged to be axially displaceable in the cylindrical region, as a result of which the spraying quantity can be easily adjusted.
  • An embodiment of this development consists in that the cylindrical region of the spray opening and the holding body are each provided with a thread.
  • a tube 1, a flange-like part 2 of the tube 1 and the housing 3 form a magnetically conductive core for the magnet coil 4, which is arranged on a winding body 5.
  • seals 6, 7 are provided between the winding body 5 on the one hand and the tube 1 and the housing 3 on the other hand seals 6, 7 are provided.
  • the tube 1 also serves as a connection for the fuel line.
  • a valve needle 12 is mounted in a guide part 11 and is pressed with its lower part against the valve seat 14 by a coil spring 13.
  • the valve seat 14 is part of a spray opening 15 provided in the guide part 11, which continues in an opening of the cap 16.
  • An armature 17 is provided at the end of the valve needle 12 opposite the spray opening 15, which armature is drawn against the spring force in the direction of the tube 1 when the solenoid 4 is energized and thus opens the valve.
  • the spray opening 15 has a conical region and a cylindrical region 21.
  • a holding body for a pin 19 is located in the cylindrical region 21.
  • the holding body 18 has one or more bores 22, preferably having a tangential component.
  • FIG. 2 shows an enlarged representation of the area of the spray opening 15.
  • the holding body 18 is screwed into the cylindrical area 21 of the spray opening 15 by means of a thread 23.
  • the pin 19 By rotating the pin 19, the axial position of the holding body 18 and the pin 19 can thus be adjusted precisely.
  • Known fuel injection valves namely the stroke of the valve needle 12 is very much in the amount of fuel to be metered with a stroke. It is therefore necessary in known valves to adhere to the amount of fuel to be metered by tight tolerances of the corresponding parts of the fuel injection valve and by additional reworking of the already assembled valve. This rework consists, for example, in that the valve bore is reground, and is time-consuming and therefore cost-intensive.
  • the static throughput in the region of the working stroke of the valve needle 12 as a result of a curved characteristic curve is relatively little dependent on the stroke.
  • the curvature of the characteristic curve results from the fact that with small strokes the opening annular gap between the closing member 25 and the valve seat 14 opposes the greatest resistance to the fuel flow, while with larger strokes the flow resistance of the one located between the pin 19 and the conical wall of the spray opening 15 Annular gap predominates.

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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)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

In an electromagnetically actuatable fuel-injection valve for injection systems for internal-combustion engines, the valve includes a valve housing, an ejection opening, a magnet winding, a closure element which is connected to an armature associated with the magnet winding, and a pin which is located in the ejection opening and has a conical region, the conical region being within or at a plane formed by the outer edge of the ejection opening. In this way, the formation of drops at the edge of the ejection opening is prevented so that a fine atomization is obtained.

Description

Die Erfindung bezieht sich auf ein elektromagnetisch betätigbares Kraftstoffeinspritzventil für Einspritz­anlagen für Brennkraftmaschinen mit einem Ventilge­häuse, einer Abspritzöffnung, einer Magnetwicklung und einem Schließglied, das mit einem der Magnet­wicklung zugeordneten Anker verbunden ist, wobei ein in der Abspritzöffnung angeordneter Zapfen einen konischen Bereich aufweist.The invention relates to an electromagnetically actuated fuel injection valve for injection systems for internal combustion engines, having a valve housing, a spray opening, a magnetic winding and a closing element which is connected to an armature assigned to the magnetic winding, a pin arranged in the spray opening having a conical region.

Für den Brennvorgang in Brennkraftmaschinen ist ein gut zerstäubter Kraftstoff besonders wichtig. Es sind bereits Kraftstoffeinspritzventile bekannt ge­worden, bei welchen ein Drallraum vorgesehen ist, in welchen der Kraftstoff tangential läuft, um die Zerstäubung zu verbessern. Dabei wird inner­halb der Abspritzöffnung die Aufrechterhaltung des Dralls durch eine zapfenartige Verlängerung der Ein­spritznadel unterstützt.A well atomized fuel is particularly important for the combustion process in internal combustion engines. Fuel injection valves are already known in which a swirl space is provided, in which the fuel runs tangentially in order to improve the atomization. The maintenance of the swirl within the spray opening is supported by a pin-like extension of the injection needle.

Es sind ferner Kraftstoffeinspritzventile bekannt geworden, bei welchen innerhalb der Abspritzöffnung ein Zapfen vorgesehen ist, welcher mit Hilfe eines Haltegliedes axial verstellbar ist, um die Kraft­stoffzumessung einstellen zu können. Spezielle Maß­nahmen zur Verbesserung der Zerstäubung sind dabei nicht vorgesehen.Fuel injection valves have also become known in which a pin is provided within the spray opening, which pin can be adjusted axially with the aid of a holding member in order to be able to adjust the fuel metering. There are no special measures to improve atomization.

Aufgabe der vorliegenden Erfindung ist es, ein elek­tromagnetisch betätigbares Kraftstoffeinspritzventil anzugeben, bei welchem eine gute Zerstäubung gewähr­leistet ist.The object of the present invention is to provide an electromagnetically actuated fuel injection valve in which good atomization is ensured.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der konische Bereich nicht über die von dem äußeren Rand der Abspritzöffnung gebildete Ebene hinausragt.This object is achieved in that the conical area does not protrude beyond the plane formed by the outer edge of the spray opening.

Das erfindungsgemäße elektromagnetisch betätigbare Kraftstoffeinspritzventil hat den Vorteil, daß die an der Wandung der Abspritzöffnung fließende Kraft­stoffschicht vor dem Erreichen des Randes durch von dem konischen Teil des Zapfens ausgehende Teilchen gestört wird, wodurch eine Ablösung der an der Wan­dung entlang fließenden Kraftstoffschicht in Form von größeren Tropfen verhindert wird. Insbesondere bei Einspritzanlagen, in welchen der Kraftstoff im Bereich der Drosselklappe in den Ansaugkanal ge­spritzt wird, ergibt sich dabei eine gute Zerstäu­bung des Kraftstoffs und gleichzeitig ein hohler Sprühkegel.The electromagnetically actuated fuel injection valve according to the invention has the advantage that the fuel layer flowing on the wall of the spray opening is disturbed by particles emanating from the conical part of the pin before reaching the edge, as a result of which the fuel layer flowing along the wall is detached in the form of larger drops is prevented. In particular in the case of injection systems in which the fuel is injected into the intake duct in the region of the throttle valve, this results in good atomization of the fuel and at the same time a hollow spray cone.

Eine Weiterbildung der Erfindung besteht darin, daß die Abspritzöffnung in einem äußeren Bereich konisch ausgebildet ist, wobei die konischen Bereiche des Zapfens und der Abspritzöffnung derart ausgebildet sein können, daß der freie Querschnitt in Richtung auf den äußeren Rand der Abspritzöffnung abnimmt. Eine andere Weiterbildung besteht darin, daß der von der Mantelfläche und der Achse des konischen Be­reichs des Zapfens gebildete Winkel größer als der Öffnungswinkel des konischen Bereichs der Abspritz­öffnung ist. Dadurch wird eine Beschleunigung des Kraftstoffs während des Durchströmens der Abspritz­öffnung erreicht, was wiederum zur besseren Zerstäu­bung beiträgt.A further development of the invention is that the spray opening is conical in an outer region, the conical regions of the pin and the spray opening can be designed such that the free cross section decreases in the direction of the outer edge of the spray opening. Another development is that the angle formed by the lateral surface and the axis of the conical region of the pin is greater than the opening angle of the conical region of the spray opening. This accelerates the fuel as it flows through the spray opening, which in turn contributes to better atomization.

Eine weitere Weiterbildung der Erfindung besteht darin, daß der konische Bereich des Zapfens in axia­ler Richtung kürzer als der konische Bereich der Abspritzöffnung ist. Dabei besteht eine besondere Ausgestaltung darin, daß die Erzeugenden des koni­schen Bereichs des Zapfens die Mantelfläche des konischen Bereichs der Abspritzöffnung in der Nähe des äußeren Randes schneiden. Damit wird erreicht, daß die sich von der Oberfläche des konischen Teils an dessen Rand ablösenden Flüssigkeitsteilchen durch die Radialkomponente ihrer Geschwindigkeit bzw. im Falle des Dralls durch die Fliehkraft in Richtung auf den Rand der Abspritzöffnung geschleudert werden und dort die Bildung einer geschlossenen Strömung stören.Another development of the invention is that the conical region of the pin is shorter in the axial direction than the conical region of the spray opening. A special embodiment is that the generatrix of the conical region of the pin intersect the lateral surface of the conical region of the spray opening in the vicinity of the outer edge. This ensures that the liquid particles detaching from the surface of the conical part at the edge thereof are thrown by the radial component of their speed or, in the case of the swirl, by centrifugal force in the direction of the edge of the spray opening and disrupt the formation of a closed flow there.

Gemäß einer anderen Weiterbildung der Erfindung kann der Zapfen in einem Haltekörper gehalten sein, der mindestens eine Bohrung aufweist. Dabei kann die Richtung der Bohrung zur Erzeugung eines Dralls eine tangentiale Komponente aufweisen.According to another development of the invention, the pin can be held in a holding body which has at least one bore. The direction of the hole for generating a swirl can be one have tangential component.

Schließlich kann der Haltekörper gemäß einer anderen Weiterbildung der Erfindung im zylindrischen Bereich axial verschiebbar angeordnet sein, wodurch eine einfache Justierbarkeit der Abspritzmenge erreicht wird. Eine Ausgestaltung dieser Weiterbildung be­steht darin, daß der zylindrische Bereich der Ab­spritzöffnung und der Haltekörper mit je einem Gewin­de versehen sind.Finally, according to another development of the invention, the holding body can be arranged to be axially displaceable in the cylindrical region, as a result of which the spraying quantity can be easily adjusted. An embodiment of this development consists in that the cylindrical region of the spray opening and the holding body are each provided with a thread.

Diese Weiterbildung trägt wesentlich zur einfachen und wirtschaftlichen Herstellbarkeit des erfindungs­gemäßen Kraftstoffeinspritzventils bei.This development contributes significantly to the simple and economical manufacturability of the fuel injection valve according to the invention.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung an Hand mehrerer Figuren dargestellt und nachfolgend be­schrieben. Es zeigt:

  • Fig. 1 einen Schnitt durch ein Kraftstoffeinspritz­ventil und
  • Fig. 2 in vergrößerter Darstellung den Bereich der Abspritzöffnung.
The invention allows numerous embodiments. One of them is shown schematically in the drawing using several figures and described below. It shows:
  • Fig. 1 shows a section through a fuel injector and
  • Fig. 2 in an enlarged view the area of the spray opening.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the figures.

Bei dem in Fig. 1 dargestellten Kraftstoffeinspritz­ventil bilden ein Rohr 1, ein flanschartiger Teil 2 des Rohres 1 und das Gehäuse 3 einen magnetisch lei­tenden Kern für die Magnetspule 4, welche auf einem Wickelkörper 5 angeordnet ist. Zwischen dem Wickel­körper 5 einerseits und dem Rohr 1 und dem Gehäuse 3 andererseits sind Dichtungen 6, 7 vorgesehen.In the fuel injector shown in FIG. 1, a tube 1, a flange-like part 2 of the tube 1 and the housing 3 form a magnetically conductive core for the magnet coil 4, which is arranged on a winding body 5. Between the winding body 5 on the one hand and the tube 1 and the housing 3 on the other hand seals 6, 7 are provided.

Das Rohr 1 dient mit seiner Verlängerung 8 gleichzei­tig als Anschluß für die Kraftstoffleitung. Ein Kunststoffkörper 9 bildet zusammen mit einem Kontakt den elektrischen Anschluß für die Magnetspule 4.With its extension 8, the tube 1 also serves as a connection for the fuel line. A plastic body 9, together with a contact, forms the electrical connection for the magnet coil 4.

In einem Führungsteil 11 ist eine Ventilnadel 12 ge­lagert, welche von einer Schraubenfeder 13 mit ihrem unteren Teil gegen den Ventilsitz 14 gepreßt wird.A valve needle 12 is mounted in a guide part 11 and is pressed with its lower part against the valve seat 14 by a coil spring 13.

Der Ventilsitz 14 ist Teil einer im Führungsteil 11 vorgesehenen Abspritzöffnung 15, welche sich in einer Öffnung der Kappe 16 fortsetzt.The valve seat 14 is part of a spray opening 15 provided in the guide part 11, which continues in an opening of the cap 16.

Am von der Abspritzöffnung 15 entgegengesetzten Ende der Ventilnadel 12 ist ein Anker 17 vorgesehen, welcher bei Bestromung der Magnetspule 4 entgegen der Federkraft in Richtung auf das Rohr 1 gezogen wird und damit das Ventil öffnet.An armature 17 is provided at the end of the valve needle 12 opposite the spray opening 15, which armature is drawn against the spring force in the direction of the tube 1 when the solenoid 4 is energized and thus opens the valve.

Die Abspritzöffnung 15 weist einen konischen Bereich und einen zylindrischen Bereich 21 auf. In dem zylindrischen Bereich 21 befindet sich ein Haltekör­per für einen Zapfen 19. Der Haltekörper 18 weist eine oder mehrere, vorzugsweise eine tangentiale Komponente aufweisende, Bohrungen 22 auf.The spray opening 15 has a conical region and a cylindrical region 21. A holding body for a pin 19 is located in the cylindrical region 21. The holding body 18 has one or more bores 22, preferably having a tangential component.

Fig. 2 zeigt eine vergrößerte Darstellung des Be­reichs der Abspritzöffnung 15. Bei dem in Fig. 2 dar­gestellten Ausführungsbeispiel ist der Haltekörper 18 mit Hilfe eines Gewindes 23 in den ebenfalls ein Gewinde 24 aufweisenden zylindrischen Bereich 21 der Abspritzöffnung 15 eingeschraubt. Durch Drehung des Zapfens 19 läßt sich somit die axiale Lage des Halte­körpers 18 und des Zapfens 19 genau justieren. Bei bekannten Kraftstoffeinspritzventilen geht nämlich der Hub der Ventilnadel 12 sehr stark in die jeweils mit einem Hub zuzumessende Kraftstoffmenge ein. Es ist deshalb bei bekannten Ventilen erforderlich, die zuzumessende Kraftstoffmenge durch enge Toleranzen der entsprechenden Teile des Kraftstoffeinspritzven­tils und durch zusätzliche Nacharbeit des bereits zusammengesetzten Ventils einzuhalten. Diese Nachar­beiten bestehen beispielsweise darin, daß die Ventil­bohrung nachgeschliffen wird, und sind zeitaufwendig und deshalb kostenintensiv.FIG. 2 shows an enlarged representation of the area of the spray opening 15. In the exemplary embodiment shown in FIG. 2, the holding body 18 is screwed into the cylindrical area 21 of the spray opening 15 by means of a thread 23. By rotating the pin 19, the axial position of the holding body 18 and the pin 19 can thus be adjusted precisely. At Known fuel injection valves namely the stroke of the valve needle 12 is very much in the amount of fuel to be metered with a stroke. It is therefore necessary in known valves to adhere to the amount of fuel to be metered by tight tolerances of the corresponding parts of the fuel injection valve and by additional reworking of the already assembled valve. This rework consists, for example, in that the valve bore is reground, and is time-consuming and therefore cost-intensive.

Bei dem in Fig. 2 dargestellten Kraftstoffeinspritz­ventil ist jedoch der statische Durchsatz im Bereich des Arbeitshubes der Ventilnadel 12 in Folge einer gekrümmten Kennlinie relativ wenig vom Hub abhängig. Die Krümmung der Kennlinie ergibt sich daraus, daß bei geringen Hüben der sich öffnende Ringspalt zwischen dem Schließglied 25 und dem Ventilsitz 14 der Kraftstoffströmung den größten Widerstand entge­gensetzt, während bei größeren Hüben der Strömungs­widerstand des zwischen dem Zapfen 19 und der ko­nischen Wand der Abspritzöffnung 15 befindlichen Ringspalts überwiegt.In the fuel injection valve shown in FIG. 2, however, the static throughput in the region of the working stroke of the valve needle 12 as a result of a curved characteristic curve is relatively little dependent on the stroke. The curvature of the characteristic curve results from the fact that with small strokes the opening annular gap between the closing member 25 and the valve seat 14 opposes the greatest resistance to the fuel flow, while with larger strokes the flow resistance of the one located between the pin 19 and the conical wall of the spray opening 15 Annular gap predominates.

Trotz des durch die schrägliegende Bohrung 22 ent­stehenden Dralls des Kraftstoffs in der Abspritzöff­nung 15 bzw. 20 ergibt sich an der Wandung 26 der Abspritzöffnung 20 eine geschlossene Strömung, was ohne die erfindungsgemäße Maßnahme dazu führen kann, daß sich am Rand 27 relativ große Tropfen bilden und vom Rand ablösen. Dieses wird mit Hilfe des koni­schen Bereichs 28 des Zapfens 19 verhindert. Und zwar werden die Flüssigkeitsteilchen, welche sich an der Mantelfläche des Zapfens 19 nach unten bewegen und sich von dem Rand des konischen Bereichs 28 ab­lösen, in Richtung auf die Wandung 26 der Abspritz­öffnung 20 geschleudert. Dort stören sie die ge­schlossene Strömung, welche an der Wandung 26 ent­langfließt, und verhindern somit die Bildung größe­rer Tropfen an der Kante 27.In spite of the swirl of the fuel in the spray opening 15 or 20 resulting from the inclined bore 22, there is a closed flow on the wall 26 of the spray opening 20, which, without the measure according to the invention, can result in relatively large drops forming at the edge 27 and detach from the edge. This is prevented by means of the conical area 28 of the pin 19. Namely, the liquid particles, which move downward on the lateral surface of the pin 19 and detach from the edge of the conical region 28, thrown in the direction of the wall 26 of the spray opening 20. There they disturb the closed flow that flows along the wall 26 and thus prevent the formation of larger drops on the edge 27.

Claims (10)

1. Elektromagnetisch betätigbares Kraftstoffein­spritzventil für Einspritzanlagen für Brennkraft­maschinen mit einem Ventilgehäuse, einer Abspritzöff­nung, einer Magnetwicklung und einem Schließglied, das mit einem der Magnetwicklung zugeordneten Anker verbunden ist, wobei ein in der Abspritzöffnung ange­ordneter Zapfen einen konischen Bereich aufweist, dadurch gekennzeichnet, daß der konische Bereich (28) nicht über die von dem äußeren Rand (27) der Abspritzöffnung (15) gebildete Ebene hinausragt.1. Electromagnetically actuated fuel injection valve for injection systems for internal combustion engines with a valve housing, a spray opening, a magnetic winding and a closing member which is connected to an armature associated with the magnetic winding, wherein a pin arranged in the spray opening has a conical area, characterized in that the conical Area (28) does not protrude beyond the plane formed by the outer edge (27) of the spray opening (15). 2. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 1, dadurch gekennzeich­net, daß die Abspritzöffnung (15) in einem äußeren Bereich (20) konisch ausgebildet ist.2. Electromagnetically actuated fuel injection valve according to claim 1, characterized in that the spray opening (15) is conical in an outer region (20). 3. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 2, dadurch gekennzeich­net, daß die konischen Bereiche (20, 28) des Zapfens (19) und der Abspritzöffnung (15) derart ausgebildet sind, daß der freie Querschnitt in Richtung auf den äußeren Rand (27) der Abspritzöffnung (15) abnimmt.3. Electromagnetically actuated fuel injection valve according to claim 2, characterized in that the conical regions (20, 28) of the pin (19) and the spray opening (15) are formed in this way are that the free cross-section decreases in the direction of the outer edge (27) of the spray opening (15). 4. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 3, dadurch gekennzeich­net, daß der von der Mantelfläche und der Achse des konischen Bereichs (28) des Zapfens (19) gebildete Winkel größer als der Öffnungswinkel des konischen Bereichs (20) der Abspritzöffnung (15) ist.4. Electromagnetically actuated fuel injection valve according to claim 3, characterized in that the angle formed by the lateral surface and the axis of the conical region (28) of the pin (19) is greater than the opening angle of the conical region (20) of the spray opening (15). 5. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 1, dadurch gekennzeich­net, daß der konische Bereich (28) des Zapfens (19) in axialer Richtung kürzer als der konische Bereich (20) der Abspritzöffnung (15) ist.5. Electromagnetically actuated fuel injection valve according to claim 1, characterized in that the conical region (28) of the pin (19) is shorter in the axial direction than the conical region (20) of the spray opening (15). 6. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 1, dadurch gekennzeich­net, daß die Erzeugenden des konischen Bereichs (28) des Zapfens (19) die Mantelfläche (26) des konischen Bereichs (20) der Abspritzöffnung (15) in der Nähe des äußeren Randes (27) schneiden.6. Electromagnetically actuated fuel injection valve according to claim 1, characterized in that the generatrix of the conical region (28) of the pin (19), the lateral surface (26) of the conical region (20) of the spray opening (15) in the vicinity of the outer edge (27 ) to cut. 7. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 1, dadurch gekennzeich­net, daß der Zapfen (19) in einem Haltekörper (18) gehalten ist, der mindestens eine Bohrung (22) auf­weist.7. Electromagnetically actuated fuel injection valve according to claim 1, characterized in that the pin (19) is held in a holding body (18) which has at least one bore (22). 8. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 7, dadurch gekennzeich­net, daß die Richtung der Bohrung (22) eine tangen­tiale Komponente aufweist.8. Electromagnetically actuated fuel injection valve according to claim 7, characterized in that the direction of the bore (22) has a tangential component. 9. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 7, dadurch gekennzeich­net, daß der Haltekörper (18) innerhalb eines zylin­drischen Bereichs (21) der Abspritzöffnung (15) in axialer Richtung einstellbar angeordnet ist.9. Electromagnetically actuated fuel injection valve according to claim 7, characterized in that the holding body (18) within a cylindrical region (21) of the spray opening (15) is arranged adjustable in the axial direction. 10. Elektromagnetisch betätigbares Kraftstoffein­spritzventil nach Anspruch 9, dadurch gekennzeich­net, daß der zylindrische Bereich (21) der Abspritz­öffnung (15) und der Haltekörper (18) mit je einem Gewinde (23, 24) versehen sind.10. Electromagnetically actuated fuel injection valve according to claim 9, characterized in that the cylindrical region (21) of the spray opening (15) and the holding body (18) are each provided with a thread (23, 24).
EP86113334A 1985-11-04 1986-09-27 Electromagnetically actuated fuel injection valve Expired EP0223018B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113334T ATE42132T1 (en) 1985-11-04 1986-09-27 ELECTROMAGNETICALLY ACTUATED FUEL INJECTION VALVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853539056 DE3539056A1 (en) 1985-11-04 1985-11-04 ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
DE3539056 1985-11-04

Publications (3)

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EP0223018A2 true EP0223018A2 (en) 1987-05-27
EP0223018A3 EP0223018A3 (en) 1987-11-11
EP0223018B1 EP0223018B1 (en) 1989-04-12

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ID=6285116

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EP86113334A Expired EP0223018B1 (en) 1985-11-04 1986-09-27 Electromagnetically actuated fuel injection valve

Country Status (6)

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US (1) US4753393A (en)
EP (1) EP0223018B1 (en)
JP (1) JPS62107266A (en)
AT (1) ATE42132T1 (en)
BR (1) BR8605410A (en)
DE (2) DE3539056A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005378A1 (en) * 1995-07-28 1997-02-13 Robert Bosch Gmbh Fuel injection valve
US5836521A (en) * 1995-03-09 1998-11-17 Dysekompagniet I/S Valve device with impact member and solenoid for atomizing a liquid

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
DE3723698C2 (en) * 1987-07-17 1995-04-27 Bosch Gmbh Robert Fuel injector and method for adjusting it
DE8802464U1 (en) * 1988-02-25 1989-06-22 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection valve
US5307991A (en) * 1990-10-09 1994-05-03 Ford Motor Company Fuel injector and method of manufacturing
DE19641785C2 (en) * 1996-10-10 1999-01-28 Bosch Gmbh Robert Valve needle for an injection valve

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US1694209A (en) * 1925-06-18 1928-12-04 Harry E Davis Device for spraying hydrocarbon fuel
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DE3023757A1 (en) * 1980-06-25 1982-01-21 Robert Bosch Gmbh, 7000 Stuttgart INJECTION VALVE
JPS60252164A (en) * 1984-05-30 1985-12-12 Automob Antipollut & Saf Res Center Solenoid-controlled type fuel injection valve
EP0188702A1 (en) * 1985-01-23 1986-07-30 VDO Adolf Schindling AG Electromagnetically actuated fuel injector

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US1694209A (en) * 1925-06-18 1928-12-04 Harry E Davis Device for spraying hydrocarbon fuel
DE2433691A1 (en) * 1974-07-12 1976-01-29 Int Harvester Co Needle valve for fuel injection in combustion engine - with opening of very large section and rapidly adjustable fuel throughput for optimum jet preparation
DE3023757A1 (en) * 1980-06-25 1982-01-21 Robert Bosch Gmbh, 7000 Stuttgart INJECTION VALVE
JPS60252164A (en) * 1984-05-30 1985-12-12 Automob Antipollut & Saf Res Center Solenoid-controlled type fuel injection valve
EP0188702A1 (en) * 1985-01-23 1986-07-30 VDO Adolf Schindling AG Electromagnetically actuated fuel injector

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Publication number Priority date Publication date Assignee Title
US5836521A (en) * 1995-03-09 1998-11-17 Dysekompagniet I/S Valve device with impact member and solenoid for atomizing a liquid
WO1997005378A1 (en) * 1995-07-28 1997-02-13 Robert Bosch Gmbh Fuel injection valve

Also Published As

Publication number Publication date
EP0223018A3 (en) 1987-11-11
JPS62107266A (en) 1987-05-18
DE3662804D1 (en) 1989-05-18
DE3539056A1 (en) 1987-05-14
ATE42132T1 (en) 1989-04-15
BR8605410A (en) 1987-08-11
EP0223018B1 (en) 1989-04-12
US4753393A (en) 1988-06-28

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