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EP1319827A2 - Solenoid valve for controlling an injection valve of an internal combustion engine - Google Patents

Solenoid valve for controlling an injection valve of an internal combustion engine Download PDF

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Publication number
EP1319827A2
EP1319827A2 EP02026671A EP02026671A EP1319827A2 EP 1319827 A2 EP1319827 A2 EP 1319827A2 EP 02026671 A EP02026671 A EP 02026671A EP 02026671 A EP02026671 A EP 02026671A EP 1319827 A2 EP1319827 A2 EP 1319827A2
Authority
EP
European Patent Office
Prior art keywords
valve
armature
solenoid valve
valve seat
base part
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.)
Withdrawn
Application number
EP02026671A
Other languages
German (de)
French (fr)
Other versions
EP1319827A3 (en
Inventor
Rainer Haeberer
Ralf Maier
Stefan Haug
Juergen Keinath
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1319827A2 publication Critical patent/EP1319827A2/en
Publication of EP1319827A3 publication Critical patent/EP1319827A3/en
Withdrawn legal-status Critical Current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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a solenoid valve according to the Genus of claim 1.
  • Such a solenoid valve known from DE 197 01 879 A1 is used to control the fuel pressure in the control pressure chamber an injection valve, for example an injector a common rail injection system. at such injectors will check the fuel pressure controlled the movement of a valve piston in the control pressure chamber, with which an injection opening of the injection valve is opened or closed.
  • the well-known solenoid valve has an electromagnet arranged in the valve housing, one loaded by a closing spring, axially movable armature and a valve ball articulated to the armature on that with a valve seat of the solenoid valve interacts and so the fuel outflow from the control pressure chamber controls.
  • valve ball is held in a base part of the armature, that in the radial direction relative to an anchor plate the anchor is displaceable.
  • the anchor is in a mechanical Armature guide of the valve housing axially displaceable stored, which causes friction losses, which at Design of the overall system must be taken into account.
  • installation of the anchor guide in the Valve housing a mechanically quite complex overall structure required.
  • the valve member is preferably designed as a valve ball, the between the conical valve seat and one to Valve seat open centering of the armature axially is slidably mounted. Because the anchor has a stroke of only 40 ⁇ m, the valve ball is between the conical Valve seat and the inclusion of the armature axially displaceable held and found again with every switching operation exactly in the valve seat. That way abrasion of the spring on the magnetic core can be avoided that constant friction ratios over the term given are.
  • the reception of the armature is preferably dome-shaped, in particular hemispherical. Furthermore, the One-piece or two-piece anchor with one in one Anchor plate formed axially displaceably guided base part his.
  • Fig. 1 shows the upper part of an injection valve 1 , which is intended for use in a fuel injection system, in particular a common rail system for diesel fuel, which is equipped with a high-pressure fuel reservoir, which is continuously supplied with high-pressure fuel by a high-pressure feed pump.
  • the injection valve 1 has a valve housing 2 with a valve piece 3 , in the guide bore 4 of which a valve piston 5 is arranged so as to be axially displaceable, which acts with its lower end (not shown in FIG. 1) on a valve needle arranged in a nozzle body.
  • the valve needle is arranged in a pressure chamber, which is supplied with fuel under high pressure via a pressure bore.
  • the valve needle is raised against the closing force of a spring (not shown) by the high fuel pressure in the pressure chamber constantly acting on a pressure shoulder of the valve needle.
  • the fuel is then injected into the combustion chamber of the internal combustion engine through an injection opening which is then connected to the pressure chamber.
  • valve piston 5 By lowering the valve piston 5, the valve needle is pressed into a valve seat of the injection valve 1 in the closing direction and the injection process is thereby ended.
  • the end face of the valve piston 5 facing away from the valve needle delimits in the guide bore 4 a control pressure chamber 6 which is connected via an inlet channel 7 to a high-pressure fuel connection, not shown, and is therefore exposed to the high fuel pressure prevailing in the high-pressure accumulator.
  • Coaxial to the valve piston 5 branches off from the control pressure chamber 6 from a bore 8 extending in the valve piece 3, which merges into a fuel outlet channel 10 via an outlet throttle 9.
  • This fuel drain channel 10 opens into a relief chamber 11 , which is connected to a low-pressure fuel connection, not shown.
  • the fuel drain channel 10 emerges from the valve piece 3 in the region of the conically countersunk upper end face of the valve piece 3, which forms a conical valve seat 12 ( FIG. 2 ) for the valve member 13 of a solenoid valve which controls the injection valve 1 and is designed as a valve ball.
  • the valve member 13 is captively held between the valve seat 12 of the valve piece 3 and an armature 14 , which is axially movably mounted in the relief chamber 11 and is acted upon in the closing direction by a closing spring 15 , the armature 14 in the relief chamber 11 having neither an axial nor a radial guide ,
  • the armature 14 is formed in one piece with an anchor plate 16 and a base part 17 , which has a dome-shaped centering receptacle 18 for the valve member 13 on its underside.
  • the armature 14 and with it the valve member 13 are constantly acted upon in the closing direction by the closing spring 15 which is supported on the housing, so that the valve member 13 normally bears against the valve seat 12 in the closed position.
  • the armature 14 passes through that in the dome-shaped centering 18 radially centered valve member 13 each time radially in the valve seat 12 fixed and thus prevented from radially wandering away.
  • the anchor 14 makes a stroke of only about 40 microns, that is Valve member 13 between the conical valve seat 12 and the dome-shaped centering receptacle 18 of the armature 18 cannot be lost, but held axially displaceable and finds with every switching operation exactly in the valve seat 12.
  • the armature 114 is formed in two parts with an armature plate 116 and with the base part 117 , which is axially displaceably guided in a blind hole of the armature plate 116.
  • the closing spring 15 is supported on the anchor plate 16, the base part 117 being pressed permanently into the blind hole due to the flow forces.
  • FIG. 4 shows a further exemplary embodiment of the solenoid valve, in which the base part 217 of the armature 214 is guided in an axially displaceable manner in a through bore 220 of the armature plate 216 and the closing spring 15 acts on the base part 217.
  • the anchor plate 216 engages behind the base part 217 in the closing direction and is therefore coupled to this movement in the opening direction.
  • the anchor plate 216 is held in contact with the base part 217 by a soft compression spring 221 which is arranged in the relief chamber 11 and is supported on the valve piece 3 and is thus secured against falling off.
  • the armature 314 is formed in one piece with the armature plate 316 , base part 317 and hemispherical valve member 313 .

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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)
  • Magnetically Actuated Valves (AREA)

Abstract

The device has a valve seat with a conical seat face, an axially movable armature (14) between the valves seat and an electromagnet and an at least partly spherical valve element (13) for opening and closing a fuel outlet channel (10). The armature can move radially in the valve housing (2) without a mechanical guide arrangement and is radially fixed on the armature when the fuel outlet channel is closed.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Magnetventil nach der Gattung des Patentanspruchs 1. The invention relates to a solenoid valve according to the Genus of claim 1.

Ein solches aus der DE 197 01 879 A1 bekanntes Magnetventil wird zur Steuerung des Kraftstoffdrucks im Steuerdruckraum eines Einspritzventils, beispielsweise eines Injektors einer Common-Rail-Einspritzanlage, verwendet. Bei derartigen Einspritzventilen wird über den Kraftstoffdruck im Steuerdruckraum die Bewegung eines Ventilkolbens gesteuert, mit dem eine Einspritzöffnung des Einspritzventils geöffnet oder geschlossen wird. Das bekannte Magnetventil weist einen im Ventilgehäuse angeordneten Elektromagneten, einen von einer Schließfeder beaufschlagten, axial beweglichen Anker und eine am Anker angelenkte Ventilkugel auf, die mit einem Ventilsitz des Magnetventils zusammenwirkt und so den Kraftstoffabfluß aus dem Steuerdruckraum steuert.Such a solenoid valve known from DE 197 01 879 A1 is used to control the fuel pressure in the control pressure chamber an injection valve, for example an injector a common rail injection system. at such injectors will check the fuel pressure controlled the movement of a valve piston in the control pressure chamber, with which an injection opening of the injection valve is opened or closed. The well-known solenoid valve has an electromagnet arranged in the valve housing, one loaded by a closing spring, axially movable armature and a valve ball articulated to the armature on that with a valve seat of the solenoid valve interacts and so the fuel outflow from the control pressure chamber controls.

Die Ventilkugel ist in einem Sockelteil des Ankers gehalten, das in radialer Richtung relativ zu einer Ankerplatte des Ankers verschiebbar ist. Der Anker ist in einer mechanischen Ankerführung des Ventilgehäuses axial verschiebbar gelagert, wodurch Reibungsverluste entstehen, die bei der Auslegung des Gesamtsystems berücksichtigt werden müssen. Darüber hinaus macht der Einbau der Ankerführung in das Ventilgehäuse einen mechanisch recht aufwendigen Gesamtaufbau erforderlich.The valve ball is held in a base part of the armature, that in the radial direction relative to an anchor plate the anchor is displaceable. The anchor is in a mechanical Armature guide of the valve housing axially displaceable stored, which causes friction losses, which at Design of the overall system must be taken into account. In addition, the installation of the anchor guide in the Valve housing a mechanically quite complex overall structure required.

Vorteile der ErfindungAdvantages of the invention

Die Vorteile des erfindungsgemäßen Magnetventils bestehen im wesentlichen in der Einsparung der bisher verwendeten mechanischen Ankerführung und dem Wegfall der damit verbundenen Herstellungs- und Arbeitsschritte. Beim Schließen des ausgelenkten Ankers und dem Wiedereintauchen des radial fixierten Ventilglieds in den konischen Ventilsitz wird auch der Anker durch das Ventilglied jedesmal radial zum Ventilsitz fixiert und so an einem radialen Wegwandern gehindert.The advantages of the solenoid valve according to the invention exist essentially in the saving of the previously used mechanical anchor guidance and the elimination of the associated Manufacturing and work steps. While closing of the deflected anchor and the immersion of the radial fixed valve member in the conical valve seat also the armature through the valve member each time radially Valve seat fixed and thus prevented from wandering radially.

Vorzugsweise ist das Ventilglied als Ventilkugel ausgebildet, die zwischen dem konischen Ventilsitz und einer zum Ventilsitz hin offenen Zentrieraufnahme des Ankers axial verschiebbar gelagert ist. Da der Anker einen Hub von nur ca. 40 µm macht, ist die Ventilkugel zwischen dem konischen Ventilsitz und der Aufnahme des Ankers axial verschiebbar gehalten und findet bei jedem Schaltvorgang wieder genau in den Ventilsitz. Auf diese Art und Weise kann ein Scheuern der Feder am Magnetkern vermieden werden, so daß über die Laufzeit gleichbleibende Reibungsverhältnisse gegeben sind.The valve member is preferably designed as a valve ball, the between the conical valve seat and one to Valve seat open centering of the armature axially is slidably mounted. Because the anchor has a stroke of only 40 µm, the valve ball is between the conical Valve seat and the inclusion of the armature axially displaceable held and found again with every switching operation exactly in the valve seat. That way abrasion of the spring on the magnetic core can be avoided that constant friction ratios over the term given are.

Bevorzugt ist die Aufnahme des Ankers kalottenförmig, insbesondere halbkugelförmig ausgebildet. Weiterhin kann der Anker einteilig oder auch zweiteilig mit einem in einer Ankerplatte axial verschiebbar geführten Sockelteil ausgebildet sein.The reception of the armature is preferably dome-shaped, in particular hemispherical. Furthermore, the One-piece or two-piece anchor with one in one Anchor plate formed axially displaceably guided base part his.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the object the invention are the description, the drawing and removable from the claims.

Zeichnungdrawing

Vier Ausführungsbeispiele des erfindungsgemäßen Magnetventils sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Ausschnitt aus dem oberen Teil eines Einspritzventils mit einem ersten Ausführungsbeispiel des erfindungsgemäßen Magnetventils;
Fig. 2
eine vergrößerte Detailansicht des Magnetventils im Bereich seines Ventilglieds;
Fig. 3
ein zweites Ausführungsbeispiel des erfindungsgemäßen Magnetventils in einer Darstellung analog zu Fig. 1;
Fig. 4
ein drittes Ausführungsbeispiel des erfindungsgemäßen Magnetventils in einer Darstellung analog zu Fig. 1; und
Fig. 5
ein viertes Ausführungsbeispiel des erfindungsgemäßen Magnetventils in einer Darstellung analog zu Fig. 1.
Four embodiments of the solenoid valve according to the invention are shown in the drawing and are explained in more detail in the following description. Show it:
Fig. 1
a section of the upper part of an injection valve with a first embodiment of the solenoid valve according to the invention;
Fig. 2
an enlarged detail view of the solenoid valve in the region of its valve member;
Fig. 3
a second embodiment of the solenoid valve according to the invention in a representation analogous to FIG. 1;
Fig. 4
a third embodiment of the solenoid valve according to the invention in a representation analogous to FIG. 1; and
Fig. 5
a fourth embodiment of the solenoid valve according to the invention in a representation analogous to FIG. 1st

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt den oberen Teil eines Einspritzventils 1, welches zur Verwendung in einer Kraftstoffeinspritzanlage bestimmt ist, insbesondere eines Common-Rail-Systems für Dieselkraftstoff, welches mit einem Kraftstoffhochdruckspeicher ausgerüstet ist, der durch eine Hochdruckförderpumpe kontinuierlich mit Hochdruckkraftstoff versorgt wird. Fig. 1 shows the upper part of an injection valve 1 , which is intended for use in a fuel injection system, in particular a common rail system for diesel fuel, which is equipped with a high-pressure fuel reservoir, which is continuously supplied with high-pressure fuel by a high-pressure feed pump.

Das Einspritzventil 1 weist ein Ventilgehäuse 2 mit einem Ventilstück 3 auf, in dessen Führungsbohrung 4 ein Ventilkolben 5 axial verschiebbar angeordnet ist, der mit seinem in Fig. 1 nicht dargestellten unteren Ende auf eine in einem Düsenkörper angeordnete Ventilnadel einwirkt. Die Ventilnadel ist in einem Druckraum angeordnet, der über eine Druckbohrung mit unter Hochdruck stehendem Kraftstoff versorgt ist. Bei einer Öffnungshubbewegung des Ventilkolbens 5 wird die Ventilnadel durch den ständig an einer Druckschulter der Ventilnadel angreifenden Kraftstoffhochdruck im Druckraum entgegen der Schließkraft einer nicht dargestellten Feder angehoben. Durch eine dann mit dem Druckraum verbundene Einspritzöffnung erfolgt die Einspritzung des Kraftstoffs in den Brennraum der Brennkraftmaschine. Durch Absenken des Ventilkolbens 5 wird die Ventilnadel in Schließrichtung in einen Ventilsitz des Einspritzventils 1 gedrückt und dadurch der Einspritzvorgang beendet. Die von der Ventilnadel abgewandte Stirnseite des Ventilkolbens 5 begrenzt in der Führungsbohrung 4 einen Steuerdruckraum 6, der über einen Zulaufkanal 7 mit einem nicht dargestellten Kraftstoffhochdruckanschluß verbunden und somit dem im Hochdruckspeicher herrschenden hohen Kraftstoffdruck ausgesetzt ist. Koaxial zum Ventilkolben 5 zweigt aus dem Steuerdruckraum 6 eine im Ventilstück 3 verlaufende Bohrung 8 ab, die über eine Ablaufdrossel 9 in einen Kraftstoffablaufkanal 10 übergeht. Dieser Kraftstoffablaufkanal 10 mündet in einen Entlastungsraum 11, der mit einem nicht dargestellten Kraftstoffniederdruckanschluß verbunden ist. Der Austritt des Kraftstoffablaufkanals 10 aus dem Ventilstück 3 erfolgt im Bereich der kegelförmig angesenkten oberen Stirnseite des Ventilstücks 3, die einen konischen Ventilsitz 12 (Fig. 2) für das als Ventilkugel ausgebildetes Ventilglied 13 eines das Einspritzventil 1 steuernden Magnetventils bildet. Das Ventilglied 13 ist unverlierbar zwischen dem Ventilsitz 12 des Ventilstücks 3 und einem Anker 14 gehalten, der im Entlastungsraum 11 axial beweglich gelagert und mittels einer Schließfeder 15 in Schließrichtung beaufschlagt ist, wobei der Anker 14 im Entlastungsraum 11 weder eine axiale noch eine radiale Führung hat. Der Anker 14 ist einteilig mit einer Ankerplatte 16 und einem Sockelteil 17 ausgebildet, das an seiner Unterseite eine kalottenförmige Zentrieraufnahme 18 für das Ventilglied 13 hat. Der Anker 14 und mit ihm das Ventilglied 13 sind durch die gehäusefest abgestützte Schließfeder 15 ständig in Schließrichtung beaufschlagt, so daß das Ventilglied 13 normalerweise in Schließstellung am Ventilsitz 12 anliegt. Bei Erregung der Magnetspule 19 eines Elektromagneten wird der Anker 14 in axialer Richtung fort vom Ventilsitz 12 angehoben, wodurch das Ventilglied 13 durch den im Kraftstoffablaufkanal 10 herrschenden Kraftstoffdruck vom Ventilsitz 12 abgehoben wird und den Kraftstoffablaufkanal 10 zum Entlastungsraum 11 öffnet.The injection valve 1 has a valve housing 2 with a valve piece 3 , in the guide bore 4 of which a valve piston 5 is arranged so as to be axially displaceable, which acts with its lower end (not shown in FIG. 1) on a valve needle arranged in a nozzle body. The valve needle is arranged in a pressure chamber, which is supplied with fuel under high pressure via a pressure bore. During an opening stroke movement of the valve piston 5, the valve needle is raised against the closing force of a spring (not shown) by the high fuel pressure in the pressure chamber constantly acting on a pressure shoulder of the valve needle. The fuel is then injected into the combustion chamber of the internal combustion engine through an injection opening which is then connected to the pressure chamber. By lowering the valve piston 5, the valve needle is pressed into a valve seat of the injection valve 1 in the closing direction and the injection process is thereby ended. The end face of the valve piston 5 facing away from the valve needle delimits in the guide bore 4 a control pressure chamber 6 which is connected via an inlet channel 7 to a high-pressure fuel connection, not shown, and is therefore exposed to the high fuel pressure prevailing in the high-pressure accumulator. Coaxial to the valve piston 5 branches off from the control pressure chamber 6 from a bore 8 extending in the valve piece 3, which merges into a fuel outlet channel 10 via an outlet throttle 9. This fuel drain channel 10 opens into a relief chamber 11 , which is connected to a low-pressure fuel connection, not shown. The fuel drain channel 10 emerges from the valve piece 3 in the region of the conically countersunk upper end face of the valve piece 3, which forms a conical valve seat 12 ( FIG. 2 ) for the valve member 13 of a solenoid valve which controls the injection valve 1 and is designed as a valve ball. The valve member 13 is captively held between the valve seat 12 of the valve piece 3 and an armature 14 , which is axially movably mounted in the relief chamber 11 and is acted upon in the closing direction by a closing spring 15 , the armature 14 in the relief chamber 11 having neither an axial nor a radial guide , The armature 14 is formed in one piece with an anchor plate 16 and a base part 17 , which has a dome-shaped centering receptacle 18 for the valve member 13 on its underside. The armature 14 and with it the valve member 13 are constantly acted upon in the closing direction by the closing spring 15 which is supported on the housing, so that the valve member 13 normally bears against the valve seat 12 in the closed position. When the solenoid 19 of an electromagnet is energized, the armature 14 is raised in the axial direction away from the valve seat 12, as a result of which the valve member 13 is lifted from the valve seat 12 by the fuel pressure prevailing in the fuel outlet channel 10 and the fuel outlet channel 10 opens to the relief chamber 11.

Beim Schließen des Magnetventils wird der Anker 14 durch das in der kalottenförmigen Zentrieraufnahme 18 radial zentrierte Ventilglied 13 jedesmal radial im Ventilsitz 12 fixiert und so an einem radialen Wegwandern gehindert. Da der Anker 14 einen Hub von nur ca. 40 µm macht, ist das Ventilglied 13 zwischen dem konischen Ventilsitz 12 und der kalottenförmigen Zentrieraufnahme 18 des Ankers 18 unverlierbar, aber axial verschiebbar gehalten und findet bei jedem Schaltvorgang wieder genau in den Ventilsitz 12. When the solenoid valve closes, the armature 14 passes through that in the dome-shaped centering 18 radially centered valve member 13 each time radially in the valve seat 12 fixed and thus prevented from radially wandering away. There the anchor 14 makes a stroke of only about 40 microns, that is Valve member 13 between the conical valve seat 12 and the dome-shaped centering receptacle 18 of the armature 18 cannot be lost, but held axially displaceable and finds with every switching operation exactly in the valve seat 12.

Bei dem in Fig. 3 gezeigten Ausführungsbeispiel des Magnetventils ist der Anker 114 zweiteilig mit einer Ankerplatte 116 und mit dem Sockelteil 117 gebildet, das in einem Sackloch der Ankerplatte 116 axial verschiebbar geführt ist. Die Schließfeder 15 ist an der Ankerplatte 16 abgestützt, wobei das Sockelteil 117 aufgrund der Strömungskräfte permanent in das Sackloch gedrückt wird.In the embodiment of the solenoid valve shown in FIG. 3 , the armature 114 is formed in two parts with an armature plate 116 and with the base part 117 , which is axially displaceably guided in a blind hole of the armature plate 116. The closing spring 15 is supported on the anchor plate 16, the base part 117 being pressed permanently into the blind hole due to the flow forces.

Fig. 4 zeigt ein weiteres Ausführungsbeispiel des Magnetventils, bei dem das Sockelteil 217 des Ankers 214 in einer Durchgangsbohrung 220 der Ankerplatte 216 axial verschiebbar geführt ist und die Schließfeder 15 am Sockelteil 217 angreift. Die Ankerplatte 216 hintergreift in Schließrichtung das Sockelteil 217 und ist daher mit diesem in Öffnungsrichtung bewegungsgekoppelt. Durch eine im Entlastungsraum 11 angeordnete und am Ventilstück 3 abgestützte weiche Druckfeder 221 ist die Ankerplatte 216 in Anlage an das Sockelteil 217 gehalten und somit gegen ein Herunterfallen gesichert. FIG. 4 shows a further exemplary embodiment of the solenoid valve, in which the base part 217 of the armature 214 is guided in an axially displaceable manner in a through bore 220 of the armature plate 216 and the closing spring 15 acts on the base part 217. The anchor plate 216 engages behind the base part 217 in the closing direction and is therefore coupled to this movement in the opening direction. The anchor plate 216 is held in contact with the base part 217 by a soft compression spring 221 which is arranged in the relief chamber 11 and is supported on the valve piece 3 and is thus secured against falling off.

Bei dem in Fig. 5 gezeigten Ausführungsbeispiel des Magnetventils ist der Anker 314 einteilig mit Ankerplatte 316, Sockelteil 317 und halbkugelförmigem Ventilglied 313 ausgebildet.In the embodiment of the solenoid valve shown in FIG. 5 , the armature 314 is formed in one piece with the armature plate 316 , base part 317 and hemispherical valve member 313 .

Claims (8)

Magnetventil zur Steuerung eines Einspritzventils (1) einer Brennkraftmaschine, umfassend einen Ventilsitz (12) mit konischer Ventilsitzfläche, einen zwischen Ventilsitz (12) und einem Elektromagneten in einem Ventilgehäuse (2) axial beweglichen Anker (14; 114; 214; 314) und ein mit dem Anker (14; 114; 214; 314) bewegtes und mit dem Ventilsitz (12) zusammenwirkendes, zumindest teilkugelförmiges Ventilglied (13; 313) zum Öffnen und Schließen eines Kraftstoffablaufkanals (10),
dadurch gekennzeichnet, daß der Anker (14; 114; 214; 314) frei von mechanischen Führungsmitteln in radialer Richtung beweglich im Ventilgehäuse (2) angeordnet ist und daß zumindest bei verschlossenem Kraftstoffablaufkanal (10) das Ventilglied (13; 313) am Anker (14; 114; 214; 314) in radialer Richtung fixiert ist.Solenoid valve for controlling an injection valve (1) of an internal combustion engine, comprising a valve seat (12) with a conical valve seat surface, an armature (14; 114; 214; 314) axially movable between the valve seat (12) and an electromagnet in a valve housing (2) at least partially spherical valve member (13; 313) moved with the armature (14; 114; 214; 314) and cooperating with the valve seat (12) for opening and closing a fuel drain channel (10),
characterized in that the armature (14; 114; 214; 314) is arranged in the valve housing (2) such that it can move in the radial direction free of mechanical guide means and that the valve member (13; 313) on the armature (14 ; 114; 214; 314) is fixed in the radial direction. Magnetventil nach Anspruch 1, dadurch gekennzeichnet, daß das Ventilglied (13) als Ventilkugel ausgebildet ist, die zwischen dem konischen Ventilsitz (12) und einer zum Ventilsitz (12) hin offenen Zentrieraufnahme (18) des Ankers (14; 114; 214) axial verschiebbar gelagert ist.Solenoid valve according to claim 1, characterized in that the valve member (13) is designed as a valve ball which extends axially between the conical valve seat (12) and a centering receptacle (18) of the armature (14; 114; 214) which is open towards the valve seat (12) is slidably mounted. Magnetventil nach Anspruch 2, dadurch gekennzeichnet, daß die Zentrieraufnahme (18) des Ankers (14; 114; 214) kalottenförmig, insbesondere halbkugelförmig ausgebildet ist. Solenoid valve according to claim 2, characterized in that the centering receptacle (18) of the armature (14; 114; 214) is dome-shaped, in particular hemispherical. Magnetventil nach Anspruch 2, dadurch gekennzeichnet, daß die Zentrieraufnahme des Ankers in Richtung fort vom Ventilsitz (12) konisch zuläuft.Solenoid valve according to claim 2, characterized in that the centering receptacle of the armature tapers conically in the direction away from the valve seat (12). Magnetventil nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß die Zentrieraufnahme (18) an einem Sockelteil (117; 217) des Ankers (114; 214) vorgesehen ist, das in einer Ankerplatte (16) des Ankers (114; 214) axial verschiebbar geführt ist.Solenoid valve according to one of claims 2 to 4, characterized in that the centering receptacle (18) is provided on a base part (117; 217) of the armature (114; 214) which is in an armature plate (16) of the armature (114; 214) is guided axially. Magnetventil nach Anspruch 5, dadurch gekennzeichnet, daß das Sockelteil (217) in einer Durchgangsbohrung (220) der Ankerplatte (216) axial verschiebbar geführt und mit der Ankerplatte (216) nur in Ventilöffnungsrichtung bewegungsgekoppelt ist und daß eine in Ventilschließrichtung wirkende Ventilfeder (15) am Sockelteil (217) abgestützt ist und die Ankerplatte (216) in Anlage an das Sockelteil (217) durch eine gehäuseseitig abgestützte Feder (221) gehalten ist.Solenoid valve according to claim 5, characterized in that the base part (217) is axially displaceably guided in a through hole (220) of the armature plate (216) and is coupled to the armature plate (216) only in the valve opening direction and that a valve spring (15) acting in the valve closing direction is supported on the base part (217) and the anchor plate (216) is held in contact with the base part (217) by a spring (221) supported on the housing side. Magnetventil nach Anspruch 1, dadurch gekennzeichnet, daß der Anker (314) und das Ventilglied (313) einteilig ausgebildet sind.Solenoid valve according to claim 1, characterized in that the armature (314) and the valve member (313) are formed in one piece. Magnetventil nach einem der vorhergehenden Ansprüche, gekennzeichnet durch eine in Ventilschließrichtung auf den Anker (14; 114; 214; 314) wirkende Ventilfeder (15).Solenoid valve according to one of the preceding claims, characterized by a valve spring (15) acting in the valve closing direction on the armature (14; 114; 214; 314).
EP02026671A 2001-12-12 2002-11-29 Solenoid valve for controlling an injection valve of an internal combustion engine Withdrawn EP1319827A3 (en)

Applications Claiming Priority (2)

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DE10161002 2001-12-12
DE2001161002 DE10161002A1 (en) 2001-12-12 2001-12-12 Solenoid valve for controlling an injection valve of an internal combustion engine

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EP1319827A2 true EP1319827A2 (en) 2003-06-18
EP1319827A3 EP1319827A3 (en) 2004-12-29

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EP1319827A3 (en) 2004-12-29
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