EP1706631B1 - Liquid injection valve - Google Patents

Liquid injection valve Download PDF

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Publication number
EP1706631B1
EP1706631B1 EP04703786A EP04703786A EP1706631B1 EP 1706631 B1 EP1706631 B1 EP 1706631B1 EP 04703786 A EP04703786 A EP 04703786A EP 04703786 A EP04703786 A EP 04703786A EP 1706631 B1 EP1706631 B1 EP 1706631B1
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EP
European Patent Office
Prior art keywords
valve
injection
needle
injection valve
valve needle
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
Application number
EP04703786A
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German (de)
French (fr)
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EP1706631A1 (en
Inventor
Heribert O. Geisser
Peter Klaus Affolter
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Dualon International Holding SA
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Dualon International Holding SA
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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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the present invention relates to a valve for liquid injection, in particular for internal combustion engines, with an injection valve which is to be opened and closed for the liquid injection by means of an injection valve needle, which is movable via a control valve.
  • the DE 197 17 833 discloses a hydraulic servo control element for injection injectors in which a control piston is movable via a solenoid to control the movement of an injection valve needle via the servo control element.
  • the control by the servo control element can be improved, in particular the control for high pressures and short injection times in the accuracy is even better tuned.
  • the DE 199 58 239 discloses a hydraulic valve having a valve housing having a valve seat and a shut-off body movably disposed thereon. In this case, no separate actuator is provided to lift the shut-off against the holding force of the spring element from the valve seat, wherein the stroke of the shut-off is limited by stops.
  • the shut-off is freely movable and not stored on a valve needle.
  • the DE 199 37 559 shows a solenoid valve, in which a ball via a shut-off device closes a drainage channel.
  • the ball is mounted on a pressure element which is biased by a spring in the closed position.
  • the shut-off device can lift the ball and open access to the drainage channel.
  • a radial clearance of the ball holder is not provided.
  • the control valve has a valve housing with flow channels, a pressure chamber arranged in the axial direction adjacent to the injection valve needle for controlling the axial movement of the injection valve needle and a self-centering valve body for opening and closing a discharge channel of the pressure chamber, so that by means of the self-centering valve body a particularly precise control of the Fluid flow can take place.
  • the guide of the valve body is particularly simplified in the region of a valve seat, since the valve body is self-centering and even at high pressures for the liquid injection, for example, between 1,000 and 1,500 bar, a precise movement of the valve body for controlling the injector needle is achieved.
  • valve body may have a ball for closing the discharge channel, which can then be pressed onto the valve seat.
  • the valve body has a valve needle arranged in a cylindrical guide of the valve housing.
  • the ball may be mounted on a pressure piece, which is arranged with radial clearance in the cylindrical guide for the valve needle.
  • a valve seat is formed on the discharge channel frusto-conical. Then, the valve body can be centered by the shape of the valve seat.
  • valve body of the control valve is movable by means of a solenoid, so that an electronic control of the valve is made possible with high accuracy.
  • the opening and closing movement can be defined carry out.
  • the spring force for biasing the valve body is adjustable, so that the properties of the control valve for a specific opening and closing of the injection valve depending on other factors, such as viscosity of the fluid, pressure, temperature, etc. can be determined.
  • valve leading to the pressure chamber discharge channel is recessed in a plate. This plate can then be replaced relatively easily when worn.
  • a valve 1 comprises an injection valve 2 for liquid injection, in particular for internal combustion engines, such as diesel engines, in which the fuel is injected at injection pressures of e.g. more than 1,300 bar takes place in order to keep the pollutant emissions low.
  • the injection valve 2 comprises an injection valve needle 4, by means of which one or more injection openings 5 can be closed.
  • the injection valve needle 4 is movably mounted in the axial direction.
  • a high pressure passage 6 is provided, which is supplied through a port 7 with pressurized fluid.
  • the injection valve needle 4 is biased by a spring 8 in the closed position.
  • a control valve 3 For the control of the movement of the injection valve needle 4, a control valve 3 is provided, which has a valve needle 11 which is mounted axially movably in a cylindrical guide in a housing 10. The movement of the valve needle 11 is activated via a solenoid 13, wherein a stop disc 12 is provided to limit the movement stroke.
  • a hard bush 15 is arranged, in which a compression spring 16 is positioned which is supported on the one hand on the stop plate 12 and on the other hand on an intermediate piece 17.
  • the intermediate piece 17 is movable via an adjusting screw 18, so that the bias of the compression spring 16 is adjustable.
  • the adjusting screw 18 is secured by a lock nut 19.
  • the hard sleeve 15 is slightly protruding and abuts against the stopper plate 12, so that a residual air gap 31 between the solenoid 13 and stopper plate 12 remains. Axial forces are thus added to a protruding portion 14 of the sleeve 15.
  • the valve body of the control valve 3 comprises in addition to the valve needle 11 a pressure piece 20 which has a slightly smaller diameter than the valve needle 11, so that the cylindrical guide in the housing 10 is given a slight radial clearance.
  • a ball 25 is mounted at one end portion, which is provided for the sealing of a discharge channel 24.
  • the arranged on the pressure body 20 ball 25 closes the discharge channel 24, which opens into the pressure chamber 23.
  • the pressure chamber 23 is limited to a side wall of the injection valve needle 4 and at a pressure change in the pressure chamber 23 moves according to the injection valve needle 4th
  • the ball 25 is in a closed position, builds up in the pressure chamber 23 due to a flow channel 22, a pressure on which the supply line 6 corresponds to the liquid to be injected.
  • the forces acting on the injection valve needle 4 in the axial direction due to the fluid under high pressure cancel each other out, so that due to the force of the spring 8, the injection valve needle 4 also remains in the closed position. If, due to actuation of the solenoid 13, the valve needle 11 moves slightly upwards, the ball 25 lifts from the discharge channel 24 and there is a pressure drop in the pressure chamber 23, due to the formation of the inlet channel 22 as a throttle, the pressure drop is not complete to the Inlet channel 6 is forwarded.
  • the fluid contained in the pressure chamber 23 can then be fed back to the fluid circuit via the discharge channel 24 in the plate 21 recessed radial flow channel 27 and a flow channel 28. Due to the pressure drop acting on the injection valve needle 4 axial forces in the figures from bottom to top are greater than the force of the spring 8 and thus lift the injection valve needle 4 from the injection ports 5 from. As a result, an outflow of the high-pressure fluid can take place.
  • valve needle 11 with the ball 25 If the valve needle 11 with the ball 25 is moved into the closed position by a further actuation of the solenoid 13, fluid flows out of the supply line 6 through the inlet channel 22 designed as a throttle and a pressure builds up again in the pressure chamber 23, which is the Pressure in the front region of the injection valve needle 4 corresponds approximately. Due to the pressure equalization, the injection valve needle 4 closes again due to the force of the spring 8.
  • FIG. 4 the closed position of the valve needle 11 is shown, in which the ball 25 closes the discharge channel 24.
  • the sealing surface is formed by an annular region which forms between the ball 25 and a valve seat 26.
  • FIG. 5 the open position of the valve 2 is shown, the frusto-conical valve seat 26 is visible.
  • an axial movement of the ball 25 to the valve seat 26 is a self-centering, so that a secure closing of the discharge channel 24 is ensured even with lateral forces.

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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)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Disclosed is a liquid injection valve (1), particularly for internal combustion engines, comprising an injection valve (2) that is to be opened and closed by means of an injection valve needle (4) for injecting liquid, said injection valve needle being movable via a pilot valve (3). The pilot valve (3) encompasses a valve housing (10) with flow channels, a pressure chamber (23) located adjacent to the injection valve needle (4) in an axial direction for controlling the axial movement of the injection valve needle (4), and a self-centering valve member (11, 20, 25) for opening and closing a discharge duct (24) of the pressure chamber (23). The injection valve needle can be controlled with precision by means of the valve member which preferably comprises a ball (25) and a valve needle (11).

Description

Die vorliegende Erfindung betrifft ein Ventil für die Flüssigkeitseinspritzung, insbesondere für Verbrennungskraftmaschinen, mit einem Einspritzventil, das für die Flüssigkeitseinspritzung mittels einer Einspritzventilnadel zu öffnen und zu schließen ist, die über ein Steuerventil bewegbar ist.The present invention relates to a valve for liquid injection, in particular for internal combustion engines, with an injection valve which is to be opened and closed for the liquid injection by means of an injection valve needle, which is movable via a control valve.

Die DE 197 17 833 offenbart ein hydraulisches Servosteuerelement für Einspritzinjektoren bei dem ein Steuerkolben über ein Solenoid bewegbar ist, um über das Servosteuerelement die Bewegung einer Einspritzventilnadel zu steuern. Die Ansteuerung durch das Servosteuerelement kann jedoch verbessert werden, insbesondere ist die Ansteuerung für hohe Drücke und kurze Einspritzzeiten in der Genauigkeit noch besser abzustimmen.The DE 197 17 833 discloses a hydraulic servo control element for injection injectors in which a control piston is movable via a solenoid to control the movement of an injection valve needle via the servo control element. However, the control by the servo control element can be improved, in particular the control for high pressures and short injection times in the accuracy is even better tuned.

Die DE 199 58 239 offenbart ein hydraulisches Ventil mit einem Ventilgehäuse, das einen Ventilsitz und einen daran beweglich angeordneten Absperrkörper aufweist. Dabei ist kein gesondertes Betätigungselement vorgesehen, um den Absperrkörper gegen die Haltekraft des Federelements vom Ventilsitz abzuheben, wobei der Hub des Absperrkörpers durch Anschläge begrenzt ist. Der Absperrkörper ist dabei frei beweglich und nicht an einer Ventilnadel gelagert.The DE 199 58 239 discloses a hydraulic valve having a valve housing having a valve seat and a shut-off body movably disposed thereon. In this case, no separate actuator is provided to lift the shut-off against the holding force of the spring element from the valve seat, wherein the stroke of the shut-off is limited by stops. The shut-off is freely movable and not stored on a valve needle.

Die DE 199 37 559 zeigt ein Magnetventil, bei dem eine Kugel über eine Absperreinrichtung einen Abflusskanal verschließt. Die Kugel ist an einem Druckelement gelagert, das durch eine Feder in die geschlossene Position vorgespannt ist. Durch Betätigung eines Elektromagneten kann die Absperreinrichtung die Kugel abheben und den Zugang zum Abflusskanal öffnen. Ein radiales Spiel der Kugelhalterung ist nicht vorgesehen.The DE 199 37 559 shows a solenoid valve, in which a ball via a shut-off device closes a drainage channel. The ball is mounted on a pressure element which is biased by a spring in the closed position. By actuating an electromagnet, the shut-off device can lift the ball and open access to the drainage channel. A radial clearance of the ball holder is not provided.

Es ist daher Aufgabe der vorliegenden Erfindung ein Ventil für die Flüssigkeitseinspritzung zu schaffen, das ein Steuerventil mit hoher Ansprechgenauigkeit aufweist.It is therefore an object of the present invention to provide a valve for liquid injection, which has a control valve with high response accuracy.

Diese Aufgabe wird mit einem Ventil mit den Merkmalen des Anspruches 1 gelöst.This object is achieved with a valve having the features of claim 1.

Erfindungsgemäß weist das Steuerventil ein Ventilgehäuse mit Strömungskanälen, einen in axialer Richtung benachbart zu der Einspritzventilnadel angeordneten Druckraum zur Steuerung der axialen Bewegung der Einspritzventilnadel und einen selbstzentrierenden Ventilkörper zum Öffnen und Verschließen eines Entladekanals des Druckraumes auf, sodass mittels des selbstzentrierenden Ventilkörpers eine besonders genaue Steuerung des Fluidstromes erfolgen kann. Die Führung des Ventilkörpers wird insbesondere im Bereich eines Ventilsitzes vereinfacht, da der Ventilkörper selbstzentrierend ausgebildet ist und auch bei hohen Drücken für die Flüssigkeitseinspritzung, beispielsweise zwischen 1.000 und 1.500 bar, eine genaue Bewegung des Ventilkörpers zur Steuerung der Einspritzventilnadel erreicht wird.According to the invention, the control valve has a valve housing with flow channels, a pressure chamber arranged in the axial direction adjacent to the injection valve needle for controlling the axial movement of the injection valve needle and a self-centering valve body for opening and closing a discharge channel of the pressure chamber, so that by means of the self-centering valve body a particularly precise control of the Fluid flow can take place. The guide of the valve body is particularly simplified in the region of a valve seat, since the valve body is self-centering and even at high pressures for the liquid injection, for example, between 1,000 and 1,500 bar, a precise movement of the valve body for controlling the injector needle is achieved.

Insbesondere kann der Ventilkörper zum Verschließen des Entladekanals eine Kugel aufweisen, die dann auf den Ventilsitz anpressbar ist.In particular, the valve body may have a ball for closing the discharge channel, which can then be pressed onto the valve seat.

Vorzugsweise weist der Ventilkörper eine in einer zylindrischen Führung des Ventilgehäuses angeordnete Ventilnadel auf. Dabei kann die Kugel an einem Druckstück gelagert sein, das mit radialem Spiel in der zylindrischen Führung für die Ventilnadel angeordnet ist. Dadurch lässt sich die Bewegung der Kugel durch die Ventilnadel in axialer Richtung mit minimalem radialen Spiel steuern, und für ein genaues Verschließen des Entladekanals erfolgt die Selbstzentrierung an dem Ventilsitz. Der Zeitpunkt des Schließens und des Öffnens lässt sich damit besonders genau festlegen.Preferably, the valve body has a valve needle arranged in a cylindrical guide of the valve housing. In this case, the ball may be mounted on a pressure piece, which is arranged with radial clearance in the cylindrical guide for the valve needle. As a result, the movement of the ball through the valve needle in the axial direction with minimal radial clearance can be controlled, and for an accurate closing of the discharge channel, the self-centering takes place at the valve seat. The time of closing and opening can thus be set very precisely.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist ein Ventilsitz an dem Entladekanal kegelstumpfförmig ausgebildet. Dann kann der Ventilkörper durch die Form des Ventilsitzes zentriert werden.According to a preferred embodiment of the invention, a valve seat is formed on the discharge channel frusto-conical. Then, the valve body can be centered by the shape of the valve seat.

Vorzugsweise ist der Ventilkörper des Steuerventils mittels eines Solenoids bewegbar, sodass eine elektronische Steuerung des Ventils mit hoher Genauigkeit ermöglicht wird.Preferably, the valve body of the control valve is movable by means of a solenoid, so that an electronic control of the valve is made possible with high accuracy.

Wenn der Ventilkörper durch eine Federkraft in die den Entladekanal verschließende Position vorgespannt ist, lässt sich die Öffnungs- und Schließbewegung definiert durchführen. Vorzugsweise ist die Federkraft zum Vorspannen des Ventilkörpers einstellbar, sodass die Eigenschaften des Steuerventils für ein gezieltes Öffnen und Schließen des Einspritzventils abhängig von weiteren Faktoren, wie Viskosität des Fluides, Druck, Temperatur etc. bestimmt werden können.When the valve body is biased by a spring force into the closing position of the discharge channel, the opening and closing movement can be defined carry out. Preferably, the spring force for biasing the valve body is adjustable, so that the properties of the control valve for a specific opening and closing of the injection valve depending on other factors, such as viscosity of the fluid, pressure, temperature, etc. can be determined.

Für eine einfache Montage des Ventils ist der zu dem Druckraum führende Entladekanal in einer Platte ausgespart. Diese Platte lässt sich dann bei einem Verschleiß vergleichsweise einfach auswechseln.For easy installation of the valve leading to the pressure chamber discharge channel is recessed in a plate. This plate can then be replaced relatively easily when worn.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels mit Bezug auf die beigefügten Zeichnungen näher erläutert. Es zeigen:

Figur1
eine geschnittene Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Ventils;
Figur 2
eine vergrößerte Detailansicht eines Steuerventils des in Figur 1 gezeigten Ventils;
Figur 3
eine vergrößerte Detailansicht im Bereich des Druckraumes des Steuerventils der Figur 2;
Figur 4
eine vergrößerte Detailansicht des Steuerventils mit geschlossenem Ventilsitz, und
Figur 5
eine vergrößerte Detailansicht des Steuerventils mit geöffnetem Ventil.
The invention will be explained in more detail below with reference to an embodiment with reference to the accompanying drawings. Show it:
Figur1
a sectional view of an embodiment of a valve according to the invention;
FIG. 2
an enlarged detail view of a control valve of in FIG. 1 shown valve;
FIG. 3
an enlarged detail view in the region of the pressure chamber of the control valve of the FIG. 2 ;
FIG. 4
an enlarged detail of the control valve with closed valve seat, and
FIG. 5
an enlarged detail view of the control valve with the valve open.

Ein Ventil 1 umfasst ein Einspritzventil 2 für die Flüssigkeitseinspritzung, insbesondere für Verbrennungskraftmaschinen wie Dieselmotoren, bei denen der Kraftstoff mit Einspritzdrucken von z.B. mehr als 1.300 bar erfolgt, um die Schadstoffemissionen gering zu halten. Das Einspritzventil 2 umfasst eine Einspritzventilnadel 4, mittels der ein oder mehrere Einspritzöffnungen 5 verschließbar sind. Hierfür ist die Einspritzventilnadel 4 in axiale Richtung bewegbar gelagert. An dem Einspritzventil 2 ist ein Hochdruckkanal 6 vorgesehen, der durch einen Anschluss 7 mit unter Druck stehender Flüssigkeit versorgt wird. Die Einspritzventilnadel 4 ist über eine Feder 8 in die geschlossene Position vorgespannt.A valve 1 comprises an injection valve 2 for liquid injection, in particular for internal combustion engines, such as diesel engines, in which the fuel is injected at injection pressures of e.g. more than 1,300 bar takes place in order to keep the pollutant emissions low. The injection valve 2 comprises an injection valve needle 4, by means of which one or more injection openings 5 can be closed. For this purpose, the injection valve needle 4 is movably mounted in the axial direction. On the injection valve 2, a high pressure passage 6 is provided, which is supplied through a port 7 with pressurized fluid. The injection valve needle 4 is biased by a spring 8 in the closed position.

Für die Steuerung der Bewegung der Einspritzventilnadel 4 ist ein Steuerventil 3 vorgesehen, das eine Ventilnadel 11 aufweist, die in einer zylindrischen Führung in einem Gehäuse 10 axial beweglich gelagert ist. Die Bewegung der Ventilnadel 11 ist über ein Solenoid 13 aktivierbar, wobei zur Begrenzung des Bewegungshubes eine Anschlagscheibe 12 vorgesehen ist.For the control of the movement of the injection valve needle 4, a control valve 3 is provided, which has a valve needle 11 which is mounted axially movably in a cylindrical guide in a housing 10. The movement of the valve needle 11 is activated via a solenoid 13, wherein a stop disc 12 is provided to limit the movement stroke.

Wie in Figur 2 zu sehen ist, befindet sich innerhalb des Gehäuses 10 das Solenoid 13, welcher in Abhängigkeit eines elektrischen Impulses während einer bestimmten Zeit den Anker und die mit ihm verbundene Ventilnadel 11 anzieht, um eine Bewegung der Einspritzventilnadel 4 zu steuern. Innerhalb des Solenoids 13 ist eine harte Büchse 15 angeordnet, in der eine Druckfeder 16 positioniert ist die einerseits an der Anschlagscheibe 12 und andererseits an einem Zwischenstück 17 abgestützt ist. Das Zwischenstück 17 ist über eine Einstellschraube 18 bewegbar, sodass die Vorspannung der Druckfeder 16 einstellbar ist. Die Einstellschraube 18 ist über eine Kontermutter 19 gesichert.As in FIG. 2 can be seen, is located within the housing 10, the solenoid 13, which attracts the armature and the associated valve needle 11 in response to an electrical pulse for a certain time to control a movement of the Einspritzventilnadel 4. Within the solenoid 13, a hard bush 15 is arranged, in which a compression spring 16 is positioned which is supported on the one hand on the stop plate 12 and on the other hand on an intermediate piece 17. The intermediate piece 17 is movable via an adjusting screw 18, so that the bias of the compression spring 16 is adjustable. The adjusting screw 18 is secured by a lock nut 19.

An dem Solenoid 13 ist die harte Büchse 15 leicht hervorstehend ausgebildet und liegt an der Anschlagscheibe 12 an, sodass ein Restluftspalt 31 zwischen Solenoid 13 und Anschlagscheibe 12 verbleibt. Axialkräfte sind somit an einem hervorstehenden Abschnitt 14 der Büchse 15 aufgenommen.On the solenoid 13, the hard sleeve 15 is slightly protruding and abuts against the stopper plate 12, so that a residual air gap 31 between the solenoid 13 and stopper plate 12 remains. Axial forces are thus added to a protruding portion 14 of the sleeve 15.

Der Ventilkörper des Steuerventils 3 umfasst neben der Ventilnadel 11 ein Druckstück 20, das einen etwas geringeren Durchmesser als die Ventilnadel 11 aufweist, sodass zur zylindrischen Führung in dem Gehäuse 10 ein leichtes radiales Spiel gegeben ist. Am Druckstück 20 ist an einem Endabschnitt eine Kugel 25 gelagert, die für die Abdichtung eines Entladekanals 24 vorgesehen ist.The valve body of the control valve 3 comprises in addition to the valve needle 11 a pressure piece 20 which has a slightly smaller diameter than the valve needle 11, so that the cylindrical guide in the housing 10 is given a slight radial clearance. At the pressure piece 20, a ball 25 is mounted at one end portion, which is provided for the sealing of a discharge channel 24.

Wie insbesondere in Figur 3 ersichtlich ist, verschließt die an dem Druckkörper 20 angeordnete Kugel 25 den Entladekanal 24, der in den Druckraum 23 mündet. Der Druckraum 23 ist an einer Seitenwand der Einspritzventilnadel 4 begrenzt und bei einer Druckänderung in dem Druckraum 23 bewegt sich entsprechend die Einspritzventilnadel 4.As in particular in FIG. 3 it can be seen, the arranged on the pressure body 20 ball 25 closes the discharge channel 24, which opens into the pressure chamber 23. The pressure chamber 23 is limited to a side wall of the injection valve needle 4 and at a pressure change in the pressure chamber 23 moves according to the injection valve needle 4th

Befindet sich die Kugel 25 in einer geschlossenen Stellung, baut sich in dem Druckraum 23 aufgrund eines Strömungskanals 22 ein Druck auf, der demjenigen der Zulaufleitung 6 für die einzuspritzende Flüssigkeit entspricht. Die in Axialrichtung auf die Einspritzventilnadel 4 wirkenden Kräfte aufgrund des unter hohem Druck stehenden Fluides heben sich in etwa auf, sodass aufgrund der Kraft der Feder 8 die Einspritzventilnadel 4 ebenfalls in der geschlossenen Position verbleibt. Wird nun aufgrund einer Betätigung des Solenoids 13 die Ventilnadel 11 geringfügig nach oben bewegt, hebt die Kugel 25 von dem Entladekanal 24 ab und es erfolgt ein Druckabfall in dem Druckraum 23, wobei aufgrund der Ausbildung des Zulaufkanals 22 als Drossel der Druckabfall nicht vollständig zu dem Zulaufkanal 6 weitergeleitet wird. Das in der Druckkammer 23 enthaltene Fluid kann dann über den Entladekanal 24 in der Platte 21 ausgesparten radialen Strömungskanal 27 sowie einen Strömungskanal 28 dem Fluidkreislauf wieder zugeführt werden. Durch den Druckabfall sind die auf die Einspritzventilnadel 4 wirkenden Axialkräfte in den Figuren von unten nach oben größer als die Kraft der Feder 8 und heben somit die Einspritzventilnadel 4 von den Einspritzöffnungen 5 ab. Dadurch kann ein Ausströmen des unter hohem Druck stehenden Fluides erfolgen.The ball 25 is in a closed position, builds up in the pressure chamber 23 due to a flow channel 22, a pressure on which the supply line 6 corresponds to the liquid to be injected. The forces acting on the injection valve needle 4 in the axial direction due to the fluid under high pressure cancel each other out, so that due to the force of the spring 8, the injection valve needle 4 also remains in the closed position. If, due to actuation of the solenoid 13, the valve needle 11 moves slightly upwards, the ball 25 lifts from the discharge channel 24 and there is a pressure drop in the pressure chamber 23, due to the formation of the inlet channel 22 as a throttle, the pressure drop is not complete to the Inlet channel 6 is forwarded. The fluid contained in the pressure chamber 23 can then be fed back to the fluid circuit via the discharge channel 24 in the plate 21 recessed radial flow channel 27 and a flow channel 28. Due to the pressure drop acting on the injection valve needle 4 axial forces in the figures from bottom to top are greater than the force of the spring 8 and thus lift the injection valve needle 4 from the injection ports 5 from. As a result, an outflow of the high-pressure fluid can take place.

Wird durch eine weitere Betätigung des Solenoids 13 die Ventilnadel 11 mit der Kugel 25 in die geschlossene Stellung bewegt, strömt durch den als Drossel ausgebildeten Zulaufkanal 22 Fluid aus der Zulaufleitung 6 nach und es baut sich wieder ein Druck in der Druckkammer 23 auf, der dem Druck im vorderen Bereich der Einspritzventilnadel 4 in etwa entspricht. Durch den Druckausgleich schließt die Einspritzventilnadel 4 wieder aufgrund der Kraft der Feder 8.If the valve needle 11 with the ball 25 is moved into the closed position by a further actuation of the solenoid 13, fluid flows out of the supply line 6 through the inlet channel 22 designed as a throttle and a pressure builds up again in the pressure chamber 23, which is the Pressure in the front region of the injection valve needle 4 corresponds approximately. Due to the pressure equalization, the injection valve needle 4 closes again due to the force of the spring 8.

In Figur 4 ist die geschlossene Stellung der Ventilnadel 11 gezeigt, bei der die Kugel 25 den Entladekanal 24 verschließt. Die Dichtfläche ist dabei durch einen ringförmigen Bereich gebildet, der sich zwischen der Kugel 25 und einem Ventilsitz 26 ausbildet.In FIG. 4 the closed position of the valve needle 11 is shown, in which the ball 25 closes the discharge channel 24. The sealing surface is formed by an annular region which forms between the ball 25 and a valve seat 26.

In Figur 5 ist die geöffnete Position des Ventils 2 gezeigt, wobei der kegelstumpfförmige Ventilsitz 26 sichtbar ist. Bei einer Axialbewegung der Kugel 25 zu dem Ventilsitz 26 erfolgt eine Selbstzentrierung, sodass auch bei seitlichen Kräften ein sicheres Schließen des Entladekanals 24 gewährleistet ist.In FIG. 5 the open position of the valve 2 is shown, the frusto-conical valve seat 26 is visible. In an axial movement of the ball 25 to the valve seat 26 is a self-centering, so that a secure closing of the discharge channel 24 is ensured even with lateral forces.

Claims (7)

  1. Valve (1) for the injection of liquid, in particular for internal combustion engines, having an injection valve (2) which is to be opened and closed for the injection of liquid by means of an injection valve needle (4) which can be moved by means of a control valve (3), with the control valve (3) having a valve housing (10) with flow ducts, a pressure space (23), which is arranged adjacent to the injection valve needle (4) in the axial direction, for controlling the axial movement of the injection valve needle (4), and a self-centring valve body (11, 20, 25) for opening and closing off a relief duct (24) of the pressure space (23), with the valve body having a ball (25) and a valve needle (11), which is arranged in a cylindrical guide of the valve housing (10), for closing off the relief duct (24), and with the ball (25) being mounted on a thrust piece (20), characterized in that the thrust piece (20) is arranged with radial play in the cylindrical guide for the valve needle (11).
  2. Valve according to Claim 1, characterized in that a valve seat (26) at the relief duct (24) is of frustoconical design.
  3. Valve according to one of Claims 1 or 2,
    characterized in that the valve body (11, 20, 25) of the control valve (3) can be moved by means of a solenoid.
  4. Valve according to one of Claims 1 to 3,
    characterized in that the valve body (11, 20, 25) is preloaded by a spring force into the position which closes off the relief duct (24).
  5. Valve according to Claim 4, characterized in that the spring force for preloading the valve body (11, 20, 25) is adjustable.
  6. Valve according to one of Claims 1 to 5,
    characterized in that the relief duct (24) which leads to the pressure space (23) is cut out in a plate (21).
  7. Valve according to one of Claims 1 to 6,
    characterized in that the movement of the valve body (11, 20, 25) is limited by means of a stop disc (12).
EP04703786A 2004-01-21 2004-01-21 Liquid injection valve Expired - Lifetime EP1706631B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/000434 WO2005071253A1 (en) 2004-01-21 2004-01-21 Liquid injection valve

Publications (2)

Publication Number Publication Date
EP1706631A1 EP1706631A1 (en) 2006-10-04
EP1706631B1 true EP1706631B1 (en) 2008-07-23

Family

ID=34802723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04703786A Expired - Lifetime EP1706631B1 (en) 2004-01-21 2004-01-21 Liquid injection valve

Country Status (4)

Country Link
EP (1) EP1706631B1 (en)
AT (1) ATE402336T1 (en)
DE (1) DE502004007701D1 (en)
WO (1) WO2005071253A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3584554B2 (en) * 1995-07-26 2004-11-04 株式会社デンソー Accumulation type fuel injection device
US5626325A (en) * 1995-09-14 1997-05-06 Cummins Engine Company, Inc. High pressure control valve for a fuel injection system
DE19717833A1 (en) 1996-05-12 1997-11-20 Dualon International S A Hydraulic servo control element
DE19937559A1 (en) * 1999-08-09 2001-03-01 Bosch Gmbh Robert Two-stage solenoid valve in a compact design for an injector of an injection system for internal combustion engines
DE19958239A1 (en) * 1999-12-03 2001-06-21 Siemens Ag Hydraulic valve for IC engine fuel injection valve
DE10131125A1 (en) * 2001-06-28 2002-09-12 Bosch Gmbh Robert Magnetic valve has damped, one-piece armature with armature plate and bolt, element damping upward motion of armature in valve seat associated with underside of armature plate

Also Published As

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WO2005071253A1 (en) 2005-08-04
ATE402336T1 (en) 2008-08-15
DE502004007701D1 (en) 2008-09-04
EP1706631A1 (en) 2006-10-04

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