EP0811119B1 - Fuel injection valve for internal combustion engines - Google Patents

Fuel injection valve for internal combustion engines Download PDF

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Publication number
EP0811119B1
EP0811119B1 EP96922757A EP96922757A EP0811119B1 EP 0811119 B1 EP0811119 B1 EP 0811119B1 EP 96922757 A EP96922757 A EP 96922757A EP 96922757 A EP96922757 A EP 96922757A EP 0811119 B1 EP0811119 B1 EP 0811119B1
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EP
European Patent Office
Prior art keywords
valve
closure plate
fuel injection
pressure chamber
valve body
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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EP96922757A
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German (de)
French (fr)
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EP0811119A1 (en
Inventor
Detlev Potz
Guenter Lewentz
Uwe Gordon
Stefan Haug
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0811119A1 publication Critical patent/EP0811119A1/en
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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
    • F02M61/04—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3006—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being actuated by the pressure of the fluid to be sprayed
    • 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
    • F02M61/047—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 formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices

Definitions

  • the fuel injection valve according to the invention for internal combustion engines with the characterizing features of the claim 1 has the advantage that by arranging of the injection openings in a delimiting the pressure chamber Locking plate an individual adjustment of the position and number of injection openings to the respective requirements is made possible. Since the valve membrane is now none direct influence more on the shaping of the injection jet exercises, it can be very simple.
  • the valve member can be fixed at its center alternatively non-positive, e.g. Clamp between two Stops or cohesively, e.g. Welding on one Stop.
  • the injection openings are between the sealing seat Valve sealing surface and valve seat arranged downstream, the inlet openings radially outside the Coverage with the valve member or from its radial Edge can be arranged covered.
  • the overflow of fuel from the pressure chamber into one between the valve body face and that of the pressure chamber facing end face of the valve member included Space is advantageously by a sealing ring prevented, which is designed so that it takes off of the valve member is not affected by the seat.
  • the necessary opening pressure of the injection valve is through the Dimensioning the thickness of a spacer between the Valve body and the closure plate adjustable, via the the distance between the central fixation of the Valve member and its contact with the valve seat in the outer radial range is changeable.
  • Fuel injection valves for internal combustion engines are in shown in the drawing and are described in more detail below explained.
  • valve membrane formed disc-shaped valve member 11 On the end face of the pin 9 of the Valve body 1 is located as a curved valve membrane formed disc-shaped valve member 11 from a resilient material with its central area, where in Area of overlap with the inlet channel 5 in the pin 9 a through opening 13 is arranged in the valve member 11.
  • the closure plate having the second pin 15 is thereby disc-shaped and is one of their radially outer edge encompassing clamping nut 19 axially against the combustion chamber end face 7 of the valve body 1 clamped, between the closure plate and the End face 7 of valve member 1 has a spacer sleeve 21 is clamped.
  • the pin 15 of the closure plate 17 has one Connection channel 23 on the basis of its frontal overlap with the through opening 13 in Valve member 11 in a between the valve member 11 and the Sealing plate 17 formed pressure chamber 25 opens out.
  • the Connection channel 23 is preferably by an axial Blind bore and a transverse bore leading away from this educated.
  • the between the curved valve member 11 and the End of the closure plate 17 facing away from the combustion chamber limited pressure chamber 25 is due to the resilient contact of the free, radially outward facing edge area of the Sealed valve member 11 on the closure plate 17.
  • the radial outer wall area forms the Face of the valve member 11 facing the combustion chamber Valve sealing surface 27 under prestress (internal stress of the valve membrane) on one through part of the End face of the closure plate 17 facing away from the combustion chamber formed annular valve seat surface 29 sealing is present. These are on the system of valve seat 29 and valve sealing surface 27 formed sealing seat downstream Subsequent injection openings 31, which are considered radially outward bores in the sealing plate of the sealing seat are trained.
  • the fuel injector according to the invention for Internal combustion engines work in the following way.
  • the injection pressure can be dimensioned adjust the thickness of the spacer sleeve 21 over which the axial distance between the central fixation and the outer System of the valve member 11 and thus its biasing force is adjustable.
  • the second shown in a detail in Figure 3 Embodiment differs from the first Embodiment in the formation of the central fixation and attachment of the valve member 11 to the pin 9 of the Valve body 1, the valve member 11 here with the Pin 9 is welded, preferably laser-welded.
  • This attachment of the valve member 11 has the Advantage that on a pin on the closure plate 17th can be dispensed with, which is essential to their structure simplified.
  • FIG. 4 illustrated third embodiment covers that resilient valve member 11 with its outer, the Valve sealing surface 27 bearing the edge completely Entry opening of the injection opening 31 in the Closure plate 17, which here is in one piece with the spacer sleeve is trained.

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

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffeinspritzventil für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus. Bei einem derartigen, aus der Patentschrift US 4 635 849 bekannten Kraftstoffeinspritzventil ist am brennraumseitigen Ende ein ringförmiger Druckraum vorgesehen, der von der brennraumzugewandten Stirnseite des Ventilkörpers begrenzt wird und in den eine Kraftstoffzulaufleitung mündet. Der Druckraum ist radial einwärts durch einen Zapfen begrenzt, an dessen brennraumseitigen Ende ein Ventilglied in Form einer Ventilmembran fixiert ist, das scheibenförmig ausgebildet ist. Das Ventilglied bildet die brennraumseitige Begrenzung des Druckraums, wobei das Ventilglied an seinem radial äußeren Bereich eine Ventildichtfläche aufweist, mit der es an einem Ventilsitz, der am Ventilkörper ausgebildet ist, anliegt und den Druckraum somit gegen den Brennraum abdichtet.
Soll eine Einspritzung erfolgen, wird der Druckraum über die Zulaufleitung mit hohem Kraftstoffdruck beaufschlagt, der dabei die federnde Ventilmembran entgegen der Vorspannkraft mit ihrer Ventildichtfläche vom Ventilsitz abhebt. Über den dabei aufgesteuerten Ringspalt am radial äußeren Rand erfolgt in Folge die Kraftstoffeinspritzung. Das Ende des Einspritzvorganges wird durch das Beenden der Hochdruckzufuhr in den Druckraum gesteuert.
Dabei weist das bekannte Kraftstoffeinspritzventil jedoch den Nachteil auf, daß nur eine ringspaltförmige Einspritzöffnung möglich ist, über die sich der Kraftstoffstrahl relativ ungenau formen läßt. The invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1. In such a fuel injection valve known from US Pat. No. 4,635,849, an annular pressure chamber is provided at the end on the combustion chamber side, which is delimited by the end face of the valve body facing the combustion chamber and into which a fuel supply line opens. The pressure chamber is delimited radially inwards by a pin, at the end of which is a valve member in the form of a valve membrane, which is disk-shaped, is fixed. The valve member forms the combustion chamber-side boundary of the pressure chamber, the valve member having on its radially outer region a valve sealing surface with which it bears against a valve seat which is formed on the valve body and thus seals the pressure chamber against the combustion chamber.
If an injection is to take place, the pressure chamber is acted upon by high fuel pressure via the inlet line, which, in the process, lifts the resilient valve membrane against the preloading force with its valve sealing surface from the valve seat. The fuel injection takes place in succession via the ring gap which is opened at the radially outer edge. The end of the injection process is controlled by stopping the high pressure supply in the pressure chamber.
However, the known fuel injection valve has the disadvantage that only an annular-gap-shaped injection opening is possible, via which the fuel jet can be shaped relatively imprecisely.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß durch das Anordnen der Einspritzöffnungen in einer den Druckraum begrenzenden Verschlußplatte eine individuelle Anpassung der Lage und Anzahl der Einspritzöffnungen an die jeweiligen Erfordernisse ermöglicht wird. Da die Ventilmembran nunmehr keinen direkten Einfluß mehr auf die Formung des Einspritzstrahls ausübt, kann sie sehr einfach ausgebildet sein. The fuel injection valve according to the invention for internal combustion engines with the characterizing features of the claim 1 has the advantage that by arranging of the injection openings in a delimiting the pressure chamber Locking plate an individual adjustment of the position and number of injection openings to the respective requirements is made possible. Since the valve membrane is now none direct influence more on the shaping of the injection jet exercises, it can be very simple.

Die Fixierung des Ventilgliedes an seiner Mitte kann dabei alternativ kraftschlüssig, z.B. Einspannen zwischen zwei Anschlägen oder stoffschlüssig, z.B. Verschweißen an einem Anschlag erfolgen.The valve member can be fixed at its center alternatively non-positive, e.g. Clamp between two Stops or cohesively, e.g. Welding on one Stop.

Die Einspritzöffnungen sind dem Dichtsitz zwischen Ventildichtfläche und Ventilsitz stromabwärts nachgeordnet, wobei die Eintrittsöffnungen radial außerhalb der Überdeckung mit dem Ventilglied oder von dessen radialem Rand überdeckt angeordnet sein können.The injection openings are between the sealing seat Valve sealing surface and valve seat arranged downstream, the inlet openings radially outside the Coverage with the valve member or from its radial Edge can be arranged covered.

Das Überströmen von Kraftstoff aus dem Druckraum in einen zwischen der Ventilkörperstirnfläche und der dem Druckraum abgewandten Stirnfläche des Ventilgliedes eingeschlossenen Raum wird dabei in vorteilhafter Weise durch einen Dichtring verhindert, der dabei so ausgebildet ist, daß er das Abheben des Ventilgliedes vom Sitz nicht beeinträchtigt. Der notwendige Öffnungsdruck des Einspritzventils ist durch die Dimensionierung der Stärke einer Distanzhülse zwischen dem Ventilkörper und der Verschlußplatte einstellbar, über die der Abstand zwischen der mittigen Fixierung des Ventilgliedes und dessen Anlage am Ventilsitz im äußeren radialen Bereich veränderbar ist. The overflow of fuel from the pressure chamber into one between the valve body face and that of the pressure chamber facing end face of the valve member included Space is advantageously by a sealing ring prevented, which is designed so that it takes off of the valve member is not affected by the seat. The necessary opening pressure of the injection valve is through the Dimensioning the thickness of a spacer between the Valve body and the closure plate adjustable, via the the distance between the central fixation of the Valve member and its contact with the valve seat in the outer radial range is changeable.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Zeichnung, der Beschreibung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the The invention relates to the drawing, the Description and the claims removed.

Zeichnungdrawing

Drei Ausführungsbeispiele des erfindungsgemäßen Kraftstoffeinspritzventils für Brennkraftmaschinen sind in der Zeichnung dargestellt und werden im folgenden näher erläutert.Three embodiments of the invention Fuel injection valves for internal combustion engines are in shown in the drawing and are described in more detail below explained.

Es zeigen die Figur 1 einen Längsschnitt durch ein erstes Ausführungsbeispiel des Einspritzventils, die Figur 2 einen vergrößerten Ausschnitt aus der Figur 1 mit der Darstellung des erfindungswesentlichen Ventilgliedbereiches, die Figur 3 einen Ausschnitt aus einem zweiten Ausführungsbeispiel, bei dem das Ventilglied am Zapfen des Ventilkörpers verschweißt ist und die Figur 4 einen Ausschnitt aus einem dritten Ausführungsbeispiel, bei dem die Eintrittsöffnung der Einspritzöffnung vom Ventilglied (Ventilmembran) überdeckt wird.1 shows a longitudinal section through a first Embodiment of the injection valve, Figure 2 a enlarged section of Figure 1 with the illustration of the valve member area essential to the invention, FIG. 3 a section of a second embodiment which the valve member welded to the pin of the valve body and FIG. 4 is a section from a third Embodiment in which the inlet opening of the Injection opening covered by the valve member (valve membrane) becomes.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Das in der Figur 1 und in der Figur 2 in einem vergrößerten Ausschnitt dargestellte erste Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils weist einen rotationssymmetrischen Ventilkörper 1 auf, an dessen Zulaufende ein Anschluß 3 für eine nicht dargestellte, von einer Kraftstoffeinspritzpumpe abführende Kraftstoffeinspritzleitung vorgesehen ist. Der Ventilkörper 1 weist weiterhin einen mit der Kraftstoffeinspritzleitung verbundenen Zulaufkanal 5 auf, der durch eine axiale Durchgangsbohrung gebildet ist, die sich von der oberen Stirnseite im Bereich des Anschlusses 3 des Ventilkörpers 1 bis in einen axial von der unteren, brennraumseitigen Stirnfläche 7 des Ventilkörpers 1 vorstehenden Zapfen 9 erstreckt. An der Stirnfläche des Zapfens 9 des Ventilkörpers 1 liegt ein als gewölbte Ventilmembran ausgebildetes scheibenförmiges Ventilglied 11 aus einem federnden Werkstoff mit seinem mittigen Bereich an, wobei im Bereich der Überdeckung mit dem Zulaufkanal 5 im Zapfen 9 eine Durchgangsöffnung 13 im Ventilglied 11 angeordnet ist. An der dem Ventilkörper 1 abgewandten Stirnfläche des Ventilgliedes 11 liegt ein weiterer Zapfen 15 einer Verschlußplatte 17 am mittigen Bereich des Ventilgliedes 11 an, der den Anlagebereich des Zapfens 9 überdeckt, so daß das Ventilglied 11 zwischen den Zapfen 9 und 15 eingespannt und gegenüber dem Ventilkörper 1 in seiner Lage fixiert ist. Die den zweiten Zapfen 15 aufweisende Verschlußplatte ist dabei scheibenförmig ausgebildet und wird von einer ihren radial äußeren Rand umgreifenden Spannmutter 19 axial gegen die brennraumseitige Stirnfläche 7 des Ventilkörpers 1 verspannt, wobei zwischen der Verschlußplatte und der Stirnfläche 7 des Ventilgliedes 1 eine Distanzhülse 21 eingespannt ist.That in Figure 1 and in Figure 2 in an enlarged Excerpt shown first embodiment of the Fuel injector according to the invention has a rotationally symmetrical valve body 1, on the Inlet end a connection 3 for a, not shown, from a fuel injection pump Fuel injection line is provided. The valve body 1 also has one with the fuel injection line connected inlet channel 5, through an axial Through hole is formed, which extends from the upper Front side in the area of the connection 3 of the valve body 1 up to one axially from the lower, combustion chamber side End face 7 of the valve body 1 protruding pin 9 extends. On the end face of the pin 9 of the Valve body 1 is located as a curved valve membrane formed disc-shaped valve member 11 from a resilient material with its central area, where in Area of overlap with the inlet channel 5 in the pin 9 a through opening 13 is arranged in the valve member 11. On the end face of the valve body facing away from the Valve member 11 is another pin 15 one Closure plate 17 at the central area of the valve member 11 on, which covers the contact area of the pin 9, so that the valve member 11 clamped between the pins 9 and 15 and is fixed in position relative to the valve body 1. The closure plate having the second pin 15 is thereby disc-shaped and is one of their radially outer edge encompassing clamping nut 19 axially against the combustion chamber end face 7 of the valve body 1 clamped, between the closure plate and the End face 7 of valve member 1 has a spacer sleeve 21 is clamped.

Der Zapfen 15 der Verschlußplatte 17 weist einen Verbindungskanal 23 auf, der ausgehend von seiner stirnseitigen Überdeckung mit der Durchgangsöffnung 13 im Ventilglied 11 in einen zwischen dem Ventilglied 11 und der Verschlußplatte 17 gebildeten Druckraum 25 mündet. Der Verbindungskanal 23 ist dabei vorzugsweise durch eine axiale Sackbohrung und eine von dieser abführenden Querbohrung gebildet.The pin 15 of the closure plate 17 has one Connection channel 23 on the basis of its frontal overlap with the through opening 13 in Valve member 11 in a between the valve member 11 and the Sealing plate 17 formed pressure chamber 25 opens out. The Connection channel 23 is preferably by an axial Blind bore and a transverse bore leading away from this educated.

Der zwischen dem gewölbten Ventilglied 11 und der brennraumabgewandten Stirnseite der Verschlußplatte 17 begrenzte Druckraum 25 ist durch die federnde Anlage des freien, radial auswärts weisenden Randbereiches des Ventilgliedes 11 an der Verschlußplatte 17 abgedichtet. Dabei bildet der radiale Außenwandbereich der Brennraumzugewandten Stirnfläche des Ventilgliedes 11 eine Ventildichtfläche 27 die unter Vorspannung (Eigenspannung der Ventilmembran) an einer durch einen Teil der brennraumabgewandten Stirnfläche der Verschlußplatte 17 gebildeten ringförmigen Ventilsitzfläche 29 dichtend anliegt. Dabei sind diesem an der Anlage von Ventilsitz 29 und Ventildichtfläche 27 gebildeten Dichtsitz stromabwärts Einspritzöffnungen 31 nachgeordnet, die als radial auswärts des Dichtsitzes liegende Bohrungen in der Verschlußplatte 17 ausgebildet sind. Die Anzahl und Anordnung dieser in den Brennraum der zu versorgenden Brennkraftmaschine mündenden Einspritzöffnungen 31 ist dabei frei wählbar und kann an die jeweiligen Verhältnisse angepaßt werden. Zur Vermeidung eines Überströmens von Kraftstoff in einen zwischen der dem Druckraum 25 abgewandten Stirnseite des Ventilgliedes 11 und der Stirnfläche 7 des Ventilkörpers 1 eingeschlossenen Raumes 33 ist ein Dichtring 35 zwischen dem radial äußeren Rand der Verschlußplatte 17 und der Distanzhülse 21 eingespannt, der am druckraumabgewandten Rand des Ventilgliedes 11 anliegt und so ausgebildet ist, daß er die Abhebbewegung des freien Endes des Ventilgliedes 11 nicht beeinträchtigt. The between the curved valve member 11 and the End of the closure plate 17 facing away from the combustion chamber limited pressure chamber 25 is due to the resilient contact of the free, radially outward facing edge area of the Sealed valve member 11 on the closure plate 17. The radial outer wall area forms the Face of the valve member 11 facing the combustion chamber Valve sealing surface 27 under prestress (internal stress of the valve membrane) on one through part of the End face of the closure plate 17 facing away from the combustion chamber formed annular valve seat surface 29 sealing is present. These are on the system of valve seat 29 and valve sealing surface 27 formed sealing seat downstream Subsequent injection openings 31, which are considered radially outward bores in the sealing plate of the sealing seat are trained. The number and arrangement of these in the Combustion chamber of the internal combustion engine to be supplied opens Injection openings 31 can be freely selected and can be connected to the be adapted to the respective conditions. To avoid an overflow of fuel in between the Pressure chamber 25 facing away from the end face of the valve member 11 and the end face 7 of the valve body 1 enclosed Space 33 is a sealing ring 35 between the radially outer Edge of the closure plate 17 and the spacer sleeve 21 clamped on the edge of the Valve member 11 abuts and is designed so that it Lifting movement of the free end of the valve member 11 is not impaired.

Dabei ist am radial auswärts weisenden Randbereich der Verschlußplatte 17 vorzugsweise ein Ringabsatz 37 vorgesehen, über den sich die Stärke der Verschlußplatte 17 am äußeren Umfang in Richtung Ventilkörper 1 hin vergrößert.The radially outward-pointing edge region is the Closure plate 17, preferably a ring shoulder 37 provided, over which the thickness of the closure plate 17th enlarged on the outer circumference in the direction of valve body 1.

Das erfindungsgemäße Kraftstoffeinspritzventil für Brennkraftmaschinen arbeitet in folgender Weise.The fuel injector according to the invention for Internal combustion engines work in the following way.

Soll eine Kraftstoffeinspritzung am Einspritzventil erfolgen, wird dem Einspritzventil in bekannter Weise von der Einspritzpumpe über die Einspritzleitung ein Kraftstoffhochdruck zugeführt, der sich über den Zulaufkanal 5 in den kraftstoffgefüllten Druckraum 25 fortsetzt. Dort hebt der unter hohem Druck stehende Kraftstoff den freien Außenrand des Ventilgliedes 11 mit der Ventildichtfläche 27 entgegen der Vorspannkraft des federnden Ventilgliedes 11 (Ventilmembran) vom Ventilsitz 29 ab, so daß ein Öffnungsquerschnitt aufgesteuert wird, über den der Kraftstoff aus dem Druckraum 25 zu den Einspritzöffnungen 31 strömt, über die er weiter in den Brennraum der Brennkraftmaschine gelangt. Dabei unterbindet der vorzugsweise aus temperatur- und kraftstoffbeständigem Gummi ausgebildete Dichtring 35 ein Überströmen von Kraftstoff in den Raum 33.Should be a fuel injection at the injection valve take place, the injection valve in a known manner the injection pump via the injection line High-pressure fuel supplied, which is via the inlet channel 5 continues in the fuel-filled pressure chamber 25. There the fuel under high pressure lifts the free one Outer edge of the valve member 11 with the valve sealing surface 27 against the biasing force of the resilient valve member 11 (Valve membrane) from the valve seat 29, so that a Opening cross-section is controlled over which the Fuel from the pressure chamber 25 to the injection openings 31 flows over which it continues into the combustion chamber of the Comes to the internal combustion engine. This prevents the preferably made of temperature and fuel resistant rubber trained sealing ring 35 an overflow of fuel in room 33.

Die Kraftstoffeinspritzung wird beendet indem die Kraftstoffhochdruckzufuhr zum Einspritzventil unterbrochen wird und in Folge der Druck im Druckraum 25 unter den notwendigen Einspritzdruck absinkt, so daß das Ventilglied 11 mit seiner Ventildichtfläche 27 zur Anlage an die Ventilsitzfläche 29 zurückkehrt und das Einspritzventil schließt. Dabei sind in vorteilhafter Weise die Ventil-Funktion und die Rückstell-Funktion in einem Bauteil, nämlich dem Ventilglied 11 integriert.The fuel injection is stopped by the High-pressure fuel supply to the injector interrupted is and as a result the pressure in the pressure chamber 25 under the necessary injection pressure drops so that the valve member 11 with its valve sealing surface 27 for contact with the Valve seat 29 returns and the injector closes. The valve function is advantageous and the reset function in one component, namely integrated the valve member 11.

Der Einspritzdruck läßt sich dabei über die Dimensionierung der Dicke der Distanzhülse 21 einstellen, über die der axiale Abstand zwischen mittiger Fixierung und äußerer Anlage des Ventilgliedes 11 und somit seine Vorspannkraft einstellbar ist.The injection pressure can be dimensioned adjust the thickness of the spacer sleeve 21 over which the axial distance between the central fixation and the outer System of the valve member 11 and thus its biasing force is adjustable.

Das in der Figur 3 in einem Ausschnitt dargestellte zweite Ausführungsbeispiel unterscheidet sich zum ersten Ausführungsbeispiel in der Ausbildung der mittigen Fixierung und Befestigung des Ventilgliedes 11 am Zapfen 9 des Ventilkörpers 1, wobei das Ventilglied 11 hier mit dem Zapfen 9 verschweißt, vorzugsweise Laser-verschweißt ist. Dabei hat diese Befestigung des Ventilgliedes 11 den Vorteil, daß auf einen Zapfen an der Verschlußplatte 17 verzichtet werden kann, was deren Aufbau wesentlich vereinfacht.The second shown in a detail in Figure 3 Embodiment differs from the first Embodiment in the formation of the central fixation and attachment of the valve member 11 to the pin 9 of the Valve body 1, the valve member 11 here with the Pin 9 is welded, preferably laser-welded. This attachment of the valve member 11 has the Advantage that on a pin on the closure plate 17th can be dispensed with, which is essential to their structure simplified.

Bei dem in der Figur 4 in einem weiteren Ausschnitt dargestellten dritten Ausführungsbeispiel überdeckt das federnde Ventilglied 11 mit seinem äußeren, die Ventildichtfläche 27 tragenden Rand vollständig die Eintrittsöffnung der Einspritzöffnung 31 in der Verschlußplatte 17, die hier einstückig mit der Distanzhülse ausgebildet ist.In another section in FIG. 4 illustrated third embodiment covers that resilient valve member 11 with its outer, the Valve sealing surface 27 bearing the edge completely Entry opening of the injection opening 31 in the Closure plate 17, which here is in one piece with the spacer sleeve is trained.

Es ist somit mit dem erfindungsgemäßen Kraftstoffeinspritzventil auf konstruktiv einfache Weise möglich erhebliche Vorteile gegenüber bekannten sogenannten Membrandüsen hinsichtlich Beanspruchung und Spritzlochanordnung- und Geometrie zu erreichen.It is thus with the invention Fuel injection valve in a structurally simple manner possible considerable advantages over known so-called Membrane nozzles with regard to stress and To achieve spray hole arrangement and geometry.

Claims (10)

  1. Fuel injection valve for internal combustion engines, having a valve body (1) with an annular pressure chamber (25), which is connected to an inlet channel (5), being provided at its combustion-chamber end, the said pressure chamber being bounded by a resilient valve element (11) which bears under internal stress together with a valve-sealing surface (27) against a fixed valve seat (29) and can be raised from the latter by the pressure in the pressure chamber (25), the resilient valve element (11), which is designed as a diaphragm, being fixed in its centre with respect to the valve body (1) and forming, by means of its edge region which points radially outwards, the valve-sealing surface (27) which can be raised resiliently from the valve seat (29), characterized in that arranged downstream of the opening cross section, which is opened up in the process, is at least one injection opening (31) into the combustion chamber of the internal combustion engine, the valve element (11) being arranged between the valve body (1) and a closure plate (17) and the at least one injection opening (31) being formed in the closure plate (17).
  2. Fuel injection valve according to Claim 1, characterized in that the annular chamber enclosed between the closure plate (17) and the resilient valve element (11) forms the pressure chamber (25).
  3. Fuel injection valve according to Claim 2, characterized in that on the end surface of the pin (9) the inlet channel (5) in the valve body (1) borders onto a through opening (13) in the central region of the valve element (11), which through opening is adjoined at the other end by a connecting channel (23) in the pin (15) of the closure plate (17), the said connecting channel opening into the pressure chamber (25).
  4. Fuel injection valve according to Claim 3, characterized in that the connecting channel (23) in the pin (15) of the closure cap (17) is formed by an axial blind hole cut from a transverse hole.
  5. Fuel injection valve according to Claim 1, characterized in that the closure plate (17) is clamped axially against the valve body (1) by means of a clamping nut (19) gripping around its radially outer edge, a spacer sleeve (21) being clamped between the end surface (7) of the valve body (1) and the closure plate (17).
  6. Fuel injection valve according to Claim 2, characterized in that a circular ring-shaped valve-seat surface (29) is formed on a radially outer region of that end surface of the closure plate (17) which faces the pressure chamber (25), the valve element (11) bearing against the said valve-seat surface under prestress by means of its valve-sealing surface (27) arranged on the free, radially outer edge region.
  7. Fuel injection valve according to Claim 6, characterized in that on its radially outer edge region of the end surface facing the pressure chamber the closure plate (17) has an annular shoulder (37) via which the thickness of the closure plate (17) is increased in the edge region towards the valve body (1), a clearance remaining between the edge of the valve element (11) and the annular shoulder (37).
  8. Fuel injection valve according to Claim 6, characterized in that a multiplicity of injection openings (31) are provided in the closure plate (17), which injection openings lead radially outwards from the annular valve-seat surface (29), from that end surface of the closure plate (17) which bounds the pressure chamber (25), and open into the combustion chamber of the internal combustion engine.
  9. Fuel injection valve according to Claim 5, characterized in that a sealing ring (35) is provided between the closure plate (17) and the spacer sleeve (21), the said sealing ring, which bears against that end surface of the valve element (11) which faces away from the pressure chamber, preventing fuel from overflowing into a chamber (33) formed between the valve element (11) and the end surface (7) of the valve body (1).
  10. Fuel injection valve according to Claim 1, characterized in that the resilient valve element (11) is formed as a curved disc made of resilient material.
EP96922757A 1995-12-23 1996-07-09 Fuel injection valve for internal combustion engines Expired - Lifetime EP0811119B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19548540A DE19548540A1 (en) 1995-12-23 1995-12-23 Fuel injection valve for internal combustion engines
DE19548540 1995-12-23
PCT/DE1996/001234 WO1997023724A1 (en) 1995-12-23 1996-07-09 Fuel injection valve for internal combustion engines

Publications (2)

Publication Number Publication Date
EP0811119A1 EP0811119A1 (en) 1997-12-10
EP0811119B1 true EP0811119B1 (en) 2001-11-07

Family

ID=7781284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96922757A Expired - Lifetime EP0811119B1 (en) 1995-12-23 1996-07-09 Fuel injection valve for internal combustion engines

Country Status (7)

Country Link
EP (1) EP0811119B1 (en)
JP (1) JPH11501382A (en)
KR (1) KR19980702022A (en)
CN (1) CN1075871C (en)
DE (2) DE19548540A1 (en)
RU (1) RU2161723C2 (en)
WO (1) WO1997023724A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064802A1 (en) * 2000-12-22 2002-06-27 Bosch Gmbh Robert Fuel injection valve for combustion engine has valve sealing surface on radially outer edge of valve element biased in center section by holding element with respect to contact with valve seat
DE102014215475A1 (en) * 2014-08-05 2016-02-11 Robert Bosch Gmbh Injector, in particular injection injector for gaseous fuel
CN105396717B (en) * 2015-12-24 2017-10-24 上海震界自动化设备制造有限公司 Gas control diaphragm type nozzle
CN110538754B (en) * 2019-09-10 2021-06-08 魏新 Wood spraying device
CN111016434B (en) * 2019-12-25 2021-07-27 西安交通大学 Thin film type ink-jet printing head based on extrusion mode

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595624A (en) * 1924-03-17 1926-08-10 Scott Philip Lane Atomizer valve
US4635849A (en) * 1984-05-03 1987-01-13 Nippon Soken, Inc. Piezoelectric low-pressure fuel injector
DE9320433U1 (en) * 1993-04-10 1994-09-29 Robert Bosch Gmbh, 70469 Stuttgart Fuel injection nozzle for internal combustion engines

Also Published As

Publication number Publication date
KR19980702022A (en) 1998-07-15
CN1075871C (en) 2001-12-05
JPH11501382A (en) 1999-02-02
WO1997023724A1 (en) 1997-07-03
DE19548540A1 (en) 1997-06-26
DE59608146D1 (en) 2001-12-13
EP0811119A1 (en) 1997-12-10
CN1173911A (en) 1998-02-18
RU2161723C2 (en) 2001-01-10

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