EP2464852B1 - Fuel metering device for a fuel injection system - Google Patents

Fuel metering device for a fuel injection system Download PDF

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Publication number
EP2464852B1
EP2464852B1 EP10728180.0A EP10728180A EP2464852B1 EP 2464852 B1 EP2464852 B1 EP 2464852B1 EP 10728180 A EP10728180 A EP 10728180A EP 2464852 B1 EP2464852 B1 EP 2464852B1
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EP
European Patent Office
Prior art keywords
metering device
housing
fuel metering
fuel
valve piston
Prior art date
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Application number
EP10728180.0A
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German (de)
French (fr)
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EP2464852A1 (en
Inventor
Tobias Landenberger
Tilman Miehle
Jochen Wessner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2464852A1 publication Critical patent/EP2464852A1/en
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/445—Selection of particular materials
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the invention relates to a fuel metering device for a fuel injection system for internal combustion engines according to the preamble of claim 1.
  • Such a fuel metering device is, for example, by the DE 10 2005 025 872 A1 known.
  • the fuel metering device is used for suction-side flow rate control of a fuel pump, which is part of a fuel injection device of an internal combustion engine.
  • the known fuel metering device has an actuated by an electromagnet control valve with a valve piston, through which different flow cross sections can be adjusted in the intake of the high-pressure fuel pump. As a result, the flow rate of the fuel pump is controlled.
  • the solenoid has an armature and a movable armature pin which actuates the valve piston.
  • Anchor bolt and control valve are arranged coaxially one behind the other; the armature is arranged on a control valve opposite end of the anchor bolt.
  • the fuel metering device conventionally comprises a molded plastic part and a hydraulic control part preferably formed by steel parts.
  • the housing from a plastic overmoulding. This expands the housing for the hydraulic control circuit.
  • the case can handle it
  • the fuel metering can be made more compact and cheaper with the same functionality.
  • the technical properties such as formability, hardness, elasticity, breaking strength, temperature resistance and resistance to fuel, by the selection of starting materials, production processes and admixtures of additives within wide limits. So almost every mechanical and / or thermal requirement has to be met.
  • plastic has a low specific weight compared to metal and is relatively inexpensive. Magnetic flows are not affected by plastic.
  • the plastic version allows both the cost-effective production of standard metering units in large quantities as well as the production of smaller special series in which, for example, the socket for electrical contacting is designed differently from the large series, as these jacks later and at a reasonable cost can be connected by welding to the plastic housing.
  • the socket for electrical contacting is designed differently from the large series, as these jacks later and at a reasonable cost can be connected by welding to the plastic housing.
  • the length of the fuel metering device can be reduced by a material-compatible construction, the length of the fuel metering device.
  • the housing has at least one opening for introducing components of the fuel metering device, wherein the openings can each be closed by a cover.
  • the covers which are also preferably made of plastic, sealingly connected to the housing, preferably laser welded.
  • the housing with the covers is a completely sealed unit. It prevents fuel that can occur in the form of leaks in principle everywhere in the interior of the fuel metering device, escaping to the outside.
  • the housing causes a favorable damping with respect to vibrations.
  • an anchor bolt of the actuating device is axially guided by at least one bearing, preferably at least one bearing bush.
  • the axial guidance can be improved by two bushings are arranged at a relatively large distance from each other in the interior of the fuel metering device.
  • tilting of the armature can be prevented and, in particular, radially acting force components exerted on the armature by the actuating device (for example by an electromagnet) can be absorbed.
  • the anchor bolt and the bushings may be made of metal or plastic, wherein the anchor bolt and the bearing bushes may be made of different materials.
  • valve piston is guided axially in a separate metal sleeve.
  • the metal sleeve can ensure a sufficiently good mobility of the valve piston with low frictional forces.
  • the valve piston may be axially guided in a guide of the housing. Since the plastic material of the housing can be made very smooth, a good mobility of the valve piston is guaranteed here. In addition, this embodiment is particularly easy.
  • a plug receptacle for electrical contacting is provided on the housing, wherein the plug receptacle is formed as a separate component, preferably made of plastic, and that the plug receptacle sealingly connected to the housing, preferably laser welded, is.
  • the plug receptacle is an integral part of the plastic housing, or that the plug receptacle is a separate component. This can be used on a standard housing different plug receptacles (according to different standards) for the fuel metering.
  • FIG. 1 shows a first embodiment of a metering device 10 according to the invention in vertical section.
  • the metering device 10 is preferably arranged in a high-pressure fuel pump for operating an internal combustion engine (not shown).
  • the metering device 10 comprises on an actuating device 12 and an integrated control valve 14.
  • the actuating device 12 essentially consists of a magnetic coil 16, an armature 18 with anchor bolt 20 and a magnet pot 22 which partially surrounds the magnetic coil 16 and the armature 18.
  • the anchor bolt 20 may be made of metal or plastic.
  • the magnet pot 22 serves as a magnetic conclusion.
  • FIG. 1 is disposed below the magnetic coil 16, a magnetic cone 24.
  • the anchor bolt 20 is axially guided by a first bearing bush 26 and a second bearing bush 28, wherein the bearing bushes 26 and 28 are each arranged in the region of the two ends of the anchor bolt 20.
  • the bushings 26 and 28 may be made of metal or plastic.
  • Above the second bearing bush 28 is in FIG. 1 a residual air gap disc 30 is arranged.
  • the magnetic coil 16 on the right side has an electrical contact point 32 in the upper area, to which a first contact pin 34 connects, which leads the electrical contact via a second contact pin 36 into a plug receptacle 38.
  • the breakthrough point of the first contact pin 34 to the interior of the metering device 10 is sealed by an O-ring 40 to protect the contact pin 34 from a short circuit as well as the entire connector receptacle 38 from corrosive fuel.
  • the control valve 14 has a displaceable, sleeve-shaped valve piston 42, which bears against the anchor bolt 20 and is actuated by the anchor bolt 20.
  • a compression spring 44 is arranged, which counteracts the force of the armature pin 20 moving actuator 12.
  • the entire metering device 10 (actuator 12 and control valve 14) is enclosed by a plastic housing 46.
  • the plastic housing 46 thereby fixes the magnetic coil 16, the first and second bearing bushes 26 and 28, the electrical contact pins 34 and 36 with the plug receptacle 38 and provides a guide for the movable valve piston 42.
  • the plastic housing 46 may be an individual housing, the can be produced by an encapsulation; it can also be a standard housing (universal housing).
  • the plastic housing 46 has a first mounting opening 48.
  • the plastic housing 46 has a second mounting opening 50.
  • the mounting openings 48 and 50 are closed by cover-like cover caps 52 and 54 and laser welded to the plastic housing 46 (see reference numerals 56 and 58).
  • the plastic housing 46 with the caps 52 and 54 is a completely sealed unit.
  • the compression spring 44 is supported on the front side on a bottom 60 of the valve piston 42 and on the rear side on a part of the plastic housing 46, which is designed as a spring plate 62.
  • the spring plate 62 has in the center an inlet opening 64, which the interior of the valve piston 42 with a (not shown) prefeed pump of a fuel injection system of a Internal combustion engine connects.
  • the plastic housing 46 in a lateral region on in FIG. 1 Upper region of the valve piston 42 has a radially directed outlet opening 66 to the fuel high pressure pump, not shown in a hydraulic operative connection.
  • radial passage openings for discharging the fuel flowing through the inlet opening 64 are arranged in the wall of the valve piston.
  • the passage opening may be a laser-cut slot in almost any shape or as a bore.
  • an axially sealing O-ring 68 is arranged above the outlet opening 66, wherein a radially sealing O-ring 70 is arranged in the region of the inlet opening 64.
  • the flow-through in the metering device 10 can also be reversed (not shown).
  • the opening 64 would then be hydraulically connected to the high-pressure fuel pump, while the opening 66 would be connected to the pressure side of the prefeed pump and thus would form the inlet into the metering device 10.
  • FIG. 2 shows a second embodiment of the metering device 10 in vertical section.
  • the valve piston 42 is guided in a metal sleeve 72.
  • the metering device 10 has an axially displaceable adjusting member 74, which acts on the one hand as a spring plate 62 and on the other hand to bias the compression spring 44 according to an installation accordingly. After installation of the compression spring 44, the adjustment member 74 is fixed inextricably.
  • FIG. 3 shows a third embodiment of the metering device 10 in vertical section.
  • the illustration shows left of a center line 76, the metering device 10 in the open position and right of the center line 76, the metering device 10 in the closed position.
  • the metering device 10 is installed in this embodiment in a universal plastic housing.
  • the universal housing has a spacer sleeve 78 in order to fasten the metering device 10 in the high-pressure fuel pump, for example with a screw connection.
  • the universal housing initially comprises no plug receptacle, but only a profile 80 for inserting a standardized plug receptacle 38 as a separate component, as well as a possibility for inserting at least the first electrical contact 34.
  • the metering device 10 can be adapted to different plug-in systems.
  • the plug receptacle 38 is laser welded to the plastic housing 46, wherein the profile 80 is part of the plastic housing 46.

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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

Die Erfindung betrifft eine Kraftstoffzumesseinrichtung für eine Kraftstoffeinspritzanlage für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel metering device for a fuel injection system for internal combustion engines according to the preamble of claim 1.

Stand der TechnikState of the art

Eine solche Kraftstoffzumesseinrichtung ist bspw. durch die DE 10 2005 025 872 A1 bekannt. Die Kraftstoffzumesseinrichtung dient zur saugseitigen Fördermengenregelung einer Kraftstoffpumpe, die Teil einer Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine ist. Die bekannte Kraftstoffzumesseinrichtung weist ein von einem Elektromagneten betätigtes Regelventil mit einem Ventilkolben auf, durch das im Ansaugbereich der Kraftstoffhochdruckpumpe unterschiedliche Durchflussquerschnitte eingestellt werden können. Dadurch wird die Fördermenge der Kraftstoffpumpe gesteuert. Der Elektromagnet weist einen Anker und einen beweglichen Ankerbolzen auf, der den Ventilkolben betätigt. Ankerbolzen und Regelventil sind koaxial hintereinander angeordnet; der Anker ist dabei an einem dem Regelventil entgegengesetzten Ende des Ankerbolzens angeordnet. Die Kraftstoffzumesseinrichtung umfasst üblichervveise einen mit Kunststoff umspritzten Magnetteil und einen vorzugsweise durch Stahlteile gebildeten hydraulischen Regelteil.Such a fuel metering device is, for example, by the DE 10 2005 025 872 A1 known. The fuel metering device is used for suction-side flow rate control of a fuel pump, which is part of a fuel injection device of an internal combustion engine. The known fuel metering device has an actuated by an electromagnet control valve with a valve piston, through which different flow cross sections can be adjusted in the intake of the high-pressure fuel pump. As a result, the flow rate of the fuel pump is controlled. The solenoid has an armature and a movable armature pin which actuates the valve piston. Anchor bolt and control valve are arranged coaxially one behind the other; the armature is arranged on a control valve opposite end of the anchor bolt. The fuel metering device conventionally comprises a molded plastic part and a hydraulic control part preferably formed by steel parts.

Dokument DE 10 2004 057 011 A1 offenbart ein Steuerventil für ein Benzindirekteinspritzsystem mit einer Hochdruckpumpe.document DE 10 2004 057 011 A1 discloses a control valve for a gasoline direct injection system with a high pressure pump.

Dokument DE 10 2007 057 503 A1 offenbart eine Zumesseinheit, die in ein separates angeflanschtes Verteilerelement einer Radialkolbenpumpe integriert ist.document DE 10 2007 057 503 A1 discloses a metering unit integrated into a separate flanged distributor element of a radial piston pump.

Offenbarung der ErfindungDisclosure of the invention

Bei der erfindungsgemäßen Kraftstoffzumesseinrichtung wird vorgeschlagen, das Gehäuse aus einer Umspritzung aus Kunststoff herzustellen. Damit wird das Gehäuse für den hydraulischen Regelkreis erweitert. Das Gehäuse kann damitIn the fuel metering device according to the invention, it is proposed to produce the housing from a plastic overmoulding. This expands the housing for the hydraulic control circuit. The case can handle it

eine Abdichtfunktion nach außen hinsichtlich des Kraftstoffs übernehmen.. Die Kraftstoffzumesseinrichtung kann dadurch bei gleicher Funktionalität kompakter und kostengünstiger hergestellt werden. Dabei lassen sich die technischen Eigenschaften, wie Formbarkeit, Härte, Elastizität, Bruchfestigkeit, Temperaturbeständigkeit sowie die Beständigkeit gegenüber Kraftstoff, durch die Auswahl von Ausgangsmaterialien, Herstellungsverfahren und Beimischungen von Additiven in weiten Grenzen einstellen. So ist nahezu jede mechanische und/oder thermische Anforderung zu erfüllen. Außerdem weist Kunststoff ein im Vergleich zu Metall geringes spezifisches Gewicht auf und ist vergleichsweise preisgünstig. Magnetische Flüsse werden durch Kunststoff nicht beeinflusst.take over a sealing function to the outside with respect to the fuel .. The fuel metering can be made more compact and cheaper with the same functionality. In this case, the technical properties, such as formability, hardness, elasticity, breaking strength, temperature resistance and resistance to fuel, by the selection of starting materials, production processes and admixtures of additives within wide limits. So almost every mechanical and / or thermal requirement has to be met. In addition, plastic has a low specific weight compared to metal and is relatively inexpensive. Magnetic flows are not affected by plastic.

Die Ausführung aus Kunststoff ermöglicht sowohl die kostengünstige Herstellung von Standard-Zumesseinheiten in großen Stückzahlen als auch die Herstellung kleinere Sonder-Serien bei denen zum Beispiel die Buchse zur elektrischen Kontaktierung abweichend von der Groß-Serie gestaltet wird, da diese Buchsen nachträglich und mit vertretbarem Kostenaufwand durch Schweißen mit dem Kunststoff-Gehäuse verbunden werden können. Zudem kann durch eine werkstoffgerechte Konstruktion die Baulänge der Kraftstoffzumesseinrichtung reduziert werden.The plastic version allows both the cost-effective production of standard metering units in large quantities as well as the production of smaller special series in which, for example, the socket for electrical contacting is designed differently from the large series, as these jacks later and at a reasonable cost can be connected by welding to the plastic housing. In addition, can be reduced by a material-compatible construction, the length of the fuel metering device.

Vorteilhafte Weiterbildungen finden sich in den Unteransprüchen.Advantageous developments can be found in the subclaims.

Erfindungsgemäß weist das Gehäuse mindestens eine Öffnung zum Einführen von Bauteilen der Kraftstoffzumesseinrichtung auf, wobei die Öffnungen jeweils durch einen Deckel verschließbar sind. Nach einer Montage der Kraftstoffzumesseinrichtung werden die Deckel, die ebenfalls bevorzugt aus Kunststoff hergestellt sind, mit dem Gehäuse dichtend verbunden, bevorzugt laserverschweißt. Somit stellt das Gehäuse mit den Deckeln eine komplett abgedichtete Einheit dar. Es wird dadurch verhindert, dass Kraftstoff, der in Form von Leckagen prinzipiell überall im Innenraum der Kraftstoffzumesseinrichtung auftreten kann, nach außen austritt. Außerdem bewirkt das Gehäuse eine vorteilhafte Dämpfung in Bezug auf Schwingungen.According to the invention, the housing has at least one opening for introducing components of the fuel metering device, wherein the openings can each be closed by a cover. After assembly of the fuel metering device, the covers, which are also preferably made of plastic, sealingly connected to the housing, preferably laser welded. Thus, the housing with the covers is a completely sealed unit. It prevents fuel that can occur in the form of leaks in principle everywhere in the interior of the fuel metering device, escaping to the outside. In addition, the housing causes a favorable damping with respect to vibrations.

Ferner ist vorteilhaft, dass ein Ankerbolzen der Betätigungseinrichtung durch mindestens ein Lager, bevorzugt mindestens eine Lagerbuchse, axial geführt ist. Die axiale Führung kann dadurch verbessert werden, indem zwei Lagerbuchsen in einem relativ weiten Abstand zueinander im Innern der Kraftstoffzumesseinrichtung angeordnet sind. Dadurch kann ein Verkanten des Ankers verhindert werden und es können insbesondere von der Betätigungseinrichtung (bspw. von einem Elektromagneten) auf den Anker ausgeübte radial wirkende Kraftkomponenten aufgefangen werden. Der Ankerbolzen sowie die Lagerbuchsen können aus Metall oder aus Kunststoff gefertigt sein, wobei der Ankerbolzen und die Lagerbuchsen aus unterschiedlichen Materialien hergestellt sein können.Furthermore, it is advantageous that an anchor bolt of the actuating device is axially guided by at least one bearing, preferably at least one bearing bush. The axial guidance can be improved by two bushings are arranged at a relatively large distance from each other in the interior of the fuel metering device. As a result, tilting of the armature can be prevented and, in particular, radially acting force components exerted on the armature by the actuating device (for example by an electromagnet) can be absorbed. The anchor bolt and the bushings may be made of metal or plastic, wherein the anchor bolt and the bearing bushes may be made of different materials.

Besonders vorteilhaft ist es, wenn der Ventilkolben in einer separaten Metallhülse axial geführt ist. Die Metallhülse kann dabei eine hinreichend gute Beweglichkeit des Ventilkolbens mit geringen Reibungskräften gewährleisten. Alternativ hierzu kann der Ventilkolben auch in einer Führung des Gehäuses axial geführt sein. Da das Kunststoffmaterial des Gehäuses sehr glatt ausgeführt werden kann, ist auch hier eine gute Beweglichkeit des Ventilkolbens gewährleistet. Außerdem ist diese Ausführungsform besonders leicht.It is particularly advantageous if the valve piston is guided axially in a separate metal sleeve. The metal sleeve can ensure a sufficiently good mobility of the valve piston with low frictional forces. Alternatively, the valve piston may be axially guided in a guide of the housing. Since the plastic material of the housing can be made very smooth, a good mobility of the valve piston is guaranteed here. In addition, this embodiment is particularly easy.

Weiterhin ist vorteilhaft, dass ein magnetischer Übergang zu einem Anker der Betätigungseinrichtung in einem inneren Bereich einer Magnetspule der Betätigungseinrichtung erfolgt. Damit muss nur die Ankerlagerung außerhalb der Magnetspule angebracht sein. Vorteilhafterweise kann daher die Bauhöhe der Kraftstoffzumesseinrichtung minimiert werden.Furthermore, it is advantageous that a magnetic transition to an armature of the actuating device takes place in an inner region of a magnetic coil of the actuating device. Thus, only the armature bearing must be mounted outside the solenoid. Advantageously, therefore, the height of the fuel metering device can be minimized.

Außerdem ist möglich, dass an dem Gehäuse eine Steckeraufnahme zur elektrischen Kontaktierung vorgesehen ist, wobei die Steckeraufnahme als separates Bauteil, bevorzugt aus Kunststoff, ausgebildet ist, und dass die Steckeraufnahme mit dem Gehäuse dichtend verbunden, bevorzugt laserverschweißt, ist. Zur elektrischen Kontaktierung ist es also möglich, dass die Steckeraufnahme integraler Bestandteil des Kunststoffgehäuses ist, oder dass die Steckeraufnahme ein separates Bauteil darstellt. Damit können an einem Standard-Gehäuse unterschiedliche Steckeraufnahmen (nach unterschiedlichen Normen) für die Kraftstoffzumesseinrichtung eingesetzt werden.It is also possible that a plug receptacle for electrical contacting is provided on the housing, wherein the plug receptacle is formed as a separate component, preferably made of plastic, and that the plug receptacle sealingly connected to the housing, preferably laser welded, is. For electrical contacting, it is thus possible that the plug receptacle is an integral part of the plastic housing, or that the plug receptacle is a separate component. This can be used on a standard housing different plug receptacles (according to different standards) for the fuel metering.

Nachfolgend werden anhand der Figuren Ausführungsbeispiele der Erfindung beispielhaft erläutert. Es zeigen:

Figur 1
eine schematische Darstellung einer ersten Ausführungsform einer erfindungsgemäßen Kraftstoffzumesseinrichtung im Vertikalschnitt;
Figur 2
eine schematische Darstellung einer zweiten Ausführungsform der erfindungsgemäßen Kraftstoffzumesseinrichtung im Vertikalschnitt; und
Figur 3
eine schematische Darstellung einer dritten Ausführungsform der erfindungsgemäßen Kraftstoffzumesseinrichtung im Vertikalschnitt.
Hereinafter, exemplary embodiments of the invention will be explained by way of example with reference to FIGS. Show it:
FIG. 1
a schematic representation of a first embodiment of a fuel metering device according to the invention in vertical section;
FIG. 2
a schematic representation of a second embodiment of the fuel metering device according to the invention in vertical section; and
FIG. 3
a schematic representation of a third embodiment of the fuel metering device according to the invention in vertical section.

Detaillierte FigurenbeschreibungDetailed description of the figures

Figur 1 zeigt eine erste Ausführungsform einer erfindungsgemäßen Zumesseinrichtung 10 im Vertikalschnitt. Die Zumesseinrichtung 10 ist vorzugsweise in einer Kraftstoff-Hochdruckpumpe zum Betreiben einer Brennkraftmaschine angeordnet (nicht dargestellt). FIG. 1 shows a first embodiment of a metering device 10 according to the invention in vertical section. The metering device 10 is preferably arranged in a high-pressure fuel pump for operating an internal combustion engine (not shown).

Die Zumesseinrichtung 10 umfasst auf einer Betätigungseinrichtung 12 und ein integriertes Regelventil 14. Im Einzelnen besteht die Betätigungseinrichtung 12 im Wesentlichen aus einer Magnetspule 16, einem Anker 18 mit Ankerbolzen 20 und einem Magnettopf 22, der die Magnetspule 16 und den Anker 18 teilweise umschließt. Der Ankerbolzen 20 kann aus Metall oder aus Kunststoff hergestellt sein. Der Magnettopf 22 dient als magnetischer Rückschluss.The metering device 10 comprises on an actuating device 12 and an integrated control valve 14. In detail, the actuating device 12 essentially consists of a magnetic coil 16, an armature 18 with anchor bolt 20 and a magnet pot 22 which partially surrounds the magnetic coil 16 and the armature 18. The anchor bolt 20 may be made of metal or plastic. The magnet pot 22 serves as a magnetic conclusion.

In Figur 1 ist unterhalb der Magnetspule 16 ein Magnetkonus 24 angeordnet. Der Ankerbolzen 20 wird von einer ersten Lagerbuchse 26 und einer zweiten Lagerbuchse 28 axial geführt, wobei die Lagerbuchsen 26 und 28 jeweils im Bereich der beiden Enden des Ankerbolzens 20 angeordnet sind. Die Lagerbuchsen 26 und 28 können aus Metall oder aus Kunststoff gefertigt sein. Oberhalb der zweiten Lagerbuchse 28 ist in Figur 1 eine Restluftspaltscheibe 30 angeordnet.In FIG. 1 is disposed below the magnetic coil 16, a magnetic cone 24. The anchor bolt 20 is axially guided by a first bearing bush 26 and a second bearing bush 28, wherein the bearing bushes 26 and 28 are each arranged in the region of the two ends of the anchor bolt 20. The bushings 26 and 28 may be made of metal or plastic. Above the second bearing bush 28 is in FIG. 1 a residual air gap disc 30 is arranged.

In Figur 1 weist die Magnetspule 16 auf der rechten Seite im oberen Bereich eine elektrische Kontaktierungsstelle 32 auf, an der sich ein erster Kontaktstift 34 anschließt, die den elektrischen Kontakt über einen zweiten Kontaktstift 36 in eine Steckeraufnahme 38 führt. Die Durchbruchstelle des ersten Kontaktstifts 34 zum Innenraum der Zumesseinrichtung 10 ist durch einen O-Ring 40 abgedichtet, um den Kontaktstift 34 von einem Kurzschluss sowie die gesamte Steckeraufnahme 38 vor korrosivem Kraftstoff zu schützen.In FIG. 1 For example, the magnetic coil 16 on the right side has an electrical contact point 32 in the upper area, to which a first contact pin 34 connects, which leads the electrical contact via a second contact pin 36 into a plug receptacle 38. The breakthrough point of the first contact pin 34 to the interior of the metering device 10 is sealed by an O-ring 40 to protect the contact pin 34 from a short circuit as well as the entire connector receptacle 38 from corrosive fuel.

Das Regelventil 14 weist einen verschiebbaren, hülsenförmigen Ventilkolben 42 auf, der an dem Ankerbolzen 20 anliegt und durch den Ankerbolzen 20 betätigt wird. Im Innenraum des hülsenförmigen Ventilkolbens 42 ist eine Druckfeder 44 angeordnet, die der Kraft der den Ankerbolzen 20 bewegenden Betätigungseinrichtung 12 entgegenwirkt.The control valve 14 has a displaceable, sleeve-shaped valve piston 42, which bears against the anchor bolt 20 and is actuated by the anchor bolt 20. In the interior of the sleeve-shaped valve piston 42, a compression spring 44 is arranged, which counteracts the force of the armature pin 20 moving actuator 12.

Die gesamte Zumesseinrichtung 10 (Betätigungseinrichtung 12 und Regelventil 14) ist von einem Kunststoffgehäuse 46 umschlossen. Das Kunststoffgehäuse 46 fixiert dabei die Magnetspule 16, die erste und zweite Lagerbuchse 26 und 28, die elektrischen Kontaktstifte 34 und 36 mit der Steckeraufnahme 38 und stellt eine Führung für den beweglichen Ventilkolben 42 dar. Dabei kann das Kunststoffgehäuse 46 ein individuelles Gehäuse sein, das durch eine Umspritzung hergestellt werden kann; es kann auch ein Standardgehäuse (Universalgehäuse) sein. Zum Einführen der Bauteile im Innern der Zumesseinrichtung 10 weist das Kunststoffgehäuse 46 eine erste Montageöffnung 48 auf. Zum Einsetzen des elektrischen Kontaktstifts 34 und dessen Verbindung zum zweiten Kontaktstift 36 weist das Kunststoffgehäuse 46 eine zweite Montageöffnung 50 auf. Die Montageöffnungen 48 und 50 sind durch deckelartige Abdeckkappen 52 und 54 verschlossen und mit dem Kunststoffgehäuse 46 laserverschweißt (vgl. Bezugszeichen 56 und 58). Somit stellt das Kunststoffgehäuse 46 mit den Abdeckkappen 52 und 54 eine komplett abgedichtete Einheit dar.The entire metering device 10 (actuator 12 and control valve 14) is enclosed by a plastic housing 46. The plastic housing 46 thereby fixes the magnetic coil 16, the first and second bearing bushes 26 and 28, the electrical contact pins 34 and 36 with the plug receptacle 38 and provides a guide for the movable valve piston 42. In this case, the plastic housing 46 may be an individual housing, the can be produced by an encapsulation; it can also be a standard housing (universal housing). For introducing the components in the interior of the metering device 10, the plastic housing 46 has a first mounting opening 48. For insertion of the electrical contact pin 34 and its connection to the second contact pin 36, the plastic housing 46 has a second mounting opening 50. The mounting openings 48 and 50 are closed by cover-like cover caps 52 and 54 and laser welded to the plastic housing 46 (see reference numerals 56 and 58). Thus, the plastic housing 46 with the caps 52 and 54 is a completely sealed unit.

Die Druckfeder 44 stützt sich vorderseitig an einem Boden 60 des Ventilkolbens 42 und rückseitig an einem Teil des Kunststoffgehäuses 46 ab, der als ein Federteller 62 ausgebildet ist. Der Federteller 62 weist mittig eine Einlassöffnung 64 auf, welche den Innenraum des Ventilkolbens 42 mit einer (nicht dargestellten) Vorförderpumpe eines Kraftstoffeinspritzsystems einer Brennkraftmaschine verbindet. Außerdem weist das Kunststoffgehäuse 46 in einem seitlichen Bereich am in Figur 1 oberen Bereich des Ventilkolbens 42 eine radial gerichtete Auslassöffnung 66 zu der nicht gezeigten Kraftstoff-Hochdruckpumpe in einer hydraulischen Wirkverbindung auf.The compression spring 44 is supported on the front side on a bottom 60 of the valve piston 42 and on the rear side on a part of the plastic housing 46, which is designed as a spring plate 62. The spring plate 62 has in the center an inlet opening 64, which the interior of the valve piston 42 with a (not shown) prefeed pump of a fuel injection system of a Internal combustion engine connects. In addition, the plastic housing 46 in a lateral region on in FIG. 1 Upper region of the valve piston 42 has a radially directed outlet opening 66 to the fuel high pressure pump, not shown in a hydraulic operative connection.

Im Bereich der Auslassöffnung 66 sind in der Wandung des Ventilkolbens 42 radiale Durchlassöffnungen (nicht dargestellt) zum Austritt des durch die Einlassöffnung 64 einströmenden Kraftstoffs angeordnet. Die Durchlassöffnung kann ein lasergeschnittener Schlitz in nahezu beliebiger Form oder auch als Bohrung ausgebildet sein. In Figur 1 ist oberhalb der Auslassöffnung 66 ein axialdichtender O-Ring 68 angeordnet, wobei im Bereich der Eintrittsöffnung 64 ein radial-dichtender O-Ring 70 angeordnet ist.In the region of the outlet opening 66, radial passage openings (not shown) for discharging the fuel flowing through the inlet opening 64 are arranged in the wall of the valve piston. The passage opening may be a laser-cut slot in almost any shape or as a bore. In FIG. 1 an axially sealing O-ring 68 is arranged above the outlet opening 66, wherein a radially sealing O-ring 70 is arranged in the region of the inlet opening 64.

Das Durchströmprinzip in der Zumesseinrichtung 10 kann auch umgekehrt werden (nicht dargestellt). Hierbei wäre dann die Öffnung 64 mit der Kraftstoff-Hochdruckpumpe hydraulisch verbunden, während die Öffnung 66 mit der Druckseite der Vorförderpumpe verbunden wäre und somit den Zulauf in die Zumesseinrichtung 10 bilden würde.The flow-through in the metering device 10 can also be reversed (not shown). In this case, the opening 64 would then be hydraulically connected to the high-pressure fuel pump, while the opening 66 would be connected to the pressure side of the prefeed pump and thus would form the inlet into the metering device 10.

Die Zumesseinrichtung 10 funktioniert im Wesentlichen folgendermaßen:

  • Die Magnetkraft der bestromten Magnetspule 16 wirkt über den Ankerbolzen 20 auf den Ventilkolben 42 und bewegt diesen entgegen des Widerstandes der Druckfeder 44 kontinuierlich in eine Schließstellung des Regelventils 14.
  • Umgekehrt vermag die Druckfeder 44 den Ventilkolben 42 in Öffnungsstellung kontinuierlich zu verschieben, wenn die Bestromung die Magnetspule 16 und
  • damit dessen auf Anker 18 und Ankerbolzen 20 wirkende Magnetkraft entsprechend verringert wird. Dabei wird der Durchflussquerschnitt der nicht dargestellten Durchlassöffnung in der Wandung des Ventilkolbens 42 verändert und somit die Durchflussmenge an Kraftstoff variiert. Durch die Ausgestaltung der Durchlassöffnung sowie die lokale Position des Ventilkolbens 46 kann eine hydraulische Kennlinie der Zumesseinrichtung 10 beeinflusst werden.
The metering device 10 functions essentially as follows:
  • The magnetic force of the energized solenoid 16 acts on the armature piston 20 on the valve piston 42 and moves it against the resistance of the compression spring 44 continuously in a closed position of the control valve fourteenth
  • Conversely, the compression spring 44, the valve piston 42 in the open position to move continuously when the energization of the solenoid 16 and
  • so that its armature 18 and anchor bolt 20 acting magnetic force is reduced accordingly. In this case, the flow cross-section of the passage opening, not shown, in the wall of the valve piston 42 is changed and thus the flow rate of fuel is varied. Due to the design of the passage opening and the local position of the valve piston 46, a hydraulic characteristic of the metering device 10 can be influenced.

Figur 2 zeigt eine zweite Ausführungsform der Zumesseinrichtung 10 im Vertikalschnitt. Dabei und für die nachfolgende Figur gilt, dass solche Elemente und Bereiche, welche funktionsäquivalent sind zu Elementen und Bereichen der Zumesseinrichtung von Figur 1, die gleichen Bezugszeichen tragen und nicht nochmals im Detail erläutert werden. In der zweiten Ausführungsform der Zumesseinrichtung 10 wird der Ventilkolben 42 in einer Metallhülse 72 geführt. Außerdem weist die Zumesseinrichtung 10 ein axial verschiebbares Einstellelement 74 auf, das einerseits als Federteller 62 wirkt und um andererseits die Druckfeder 44 nach einem Einbau entsprechend vorspannen zu können. Nach dem Einbau der Druckfeder 44 wird das Einstellelement 74 unlösbar fixiert. FIG. 2 shows a second embodiment of the metering device 10 in vertical section. In this case, and for the following figure, it applies that such elements and areas which are functionally equivalent to elements and areas of the metering device of FIG. 1 , bear the same reference numerals and not will be explained again in detail. In the second embodiment of the metering device 10, the valve piston 42 is guided in a metal sleeve 72. In addition, the metering device 10 has an axially displaceable adjusting member 74, which acts on the one hand as a spring plate 62 and on the other hand to bias the compression spring 44 according to an installation accordingly. After installation of the compression spring 44, the adjustment member 74 is fixed inextricably.

Figur 3 zeigt eine dritte Ausführungsform der Zumesseinrichtung 10 im Vertikalschnitt. Die Darstellung zeigt links einer Mittellinie 76 die Zumesseinrichtung 10 in geöffneter Stellung und rechts der Mittellinie 76 die Zumesseinrichtung 10 in geschlossener Stellung. Die Zumesseinrichtung 10 ist in dieser Ausführungsform in einem Universalgehäuse aus Kunststoff eingebaut. FIG. 3 shows a third embodiment of the metering device 10 in vertical section. The illustration shows left of a center line 76, the metering device 10 in the open position and right of the center line 76, the metering device 10 in the closed position. The metering device 10 is installed in this embodiment in a universal plastic housing.

Das Universalgehäuse weist eine Distanzhülse 78 auf, um die Zumesseinrichtung 10 in der Kraftstoff-Hochdruckpumpe, bspw. mit einer Schraubverbindung, zu befestigen. Das Universalgehäuse umfasst zunächst keine Steckeraufnahme, sondern lediglich ein Profil 80 zum Einsetzen einer genormten Steckeraufnahme 38 als separates Bauelement, sowie eine Möglichkeit zum Einsetzen zumindest des ersten elektrischen Kontakts 34. So kann die Zumesseinrichtung 10 an verschiedene Stecksysteme angepasst werden. Die Steckeraufnahme 38 wird mit dem Kunststoffgehäuse 46 laserverschweißt, wobei das Profil 80 Teil des Kunststoffgehäuses 46 ist.The universal housing has a spacer sleeve 78 in order to fasten the metering device 10 in the high-pressure fuel pump, for example with a screw connection. The universal housing initially comprises no plug receptacle, but only a profile 80 for inserting a standardized plug receptacle 38 as a separate component, as well as a possibility for inserting at least the first electrical contact 34. Thus, the metering device 10 can be adapted to different plug-in systems. The plug receptacle 38 is laser welded to the plastic housing 46, wherein the profile 80 is part of the plastic housing 46.

Claims (9)

  1. Fuel metering device (10) for an injection system for injecting fuel into an internal combustion engine, having a housing (46), wherein the fuel metering device (10) has a regulating valve (14) which is actuated by an actuation device (12) and which has a valve piston (42), and the housing (46) is composed of a plastic injection-moulded encapsulation, characterized in that the housing (46) has at least one opening (48, 50) for the insertion of components of the fuel metering device (10), wherein the at least one opening (48, 50) can be closed off in each case by means of a cover (52, 54).
  2. Fuel metering device (10) according to Claim 1, characterized in that the housing (46) performs a sealing function to the outside with regard to the fuel.
  3. Fuel metering device (10) according to Claim 2, characterized in that the at least one cover (52, 54) is sealingly connected, preferably by laser welding, to the housing (46).
  4. Fuel metering device (10) according to one of the preceding claims, characterized in that an armature pin (20) of the actuation device (12) is guided axially by at least one bearing, preferably at least one bearing bushing (26, 28).
  5. Fuel metering device (10) according to one of Claims 1 to 4, characterized in that the valve piston (42) is guided axially in a separate metal sleeve (72).
  6. Fuel metering device (10) according to one of Claims 1 to 4, characterized in that the valve piston (42) is guided axially in a guide of the housing (46).
  7. Fuel metering device (10) according to one of the preceding claims, characterized in that a magnetic transition to an armature (18) of the actuation device (12) takes place in an inner region of a magnet coil (16) of the actuation device (12).
  8. Fuel metering device (10) according to one of the preceding claims, characterized in that a plug socket (38) for producing electrical contact is provided on the housing (46).
  9. Fuel metering device (10) according to Claim 8, characterized in that the plug socket (38) is formed as a separate component, preferably from plastic, and in that the plug socket (38) is sealingly connected, preferably by laser welding, to the housing (46).
EP10728180.0A 2009-08-13 2010-06-22 Fuel metering device for a fuel injection system Active EP2464852B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910028501 DE102009028501A1 (en) 2009-08-13 2009-08-13 Fuel metering device for a fuel injection system
PCT/EP2010/058791 WO2011018265A1 (en) 2009-08-13 2010-06-22 Fuel metering device for a fuel injection system

Publications (2)

Publication Number Publication Date
EP2464852A1 EP2464852A1 (en) 2012-06-20
EP2464852B1 true EP2464852B1 (en) 2013-08-14

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US (1) US8925522B2 (en)
EP (1) EP2464852B1 (en)
JP (1) JP5474192B2 (en)
CN (1) CN102725508B (en)
DE (1) DE102009028501A1 (en)
ES (1) ES2426477T3 (en)
IN (1) IN2012DN00752A (en)
RU (1) RU2561355C2 (en)
WO (1) WO2011018265A1 (en)

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CN102725508A (en) 2012-10-10
JP2013501879A (en) 2013-01-17
IN2012DN00752A (en) 2015-06-19
ES2426477T3 (en) 2013-10-23
EP2464852A1 (en) 2012-06-20
US20120152208A1 (en) 2012-06-21
WO2011018265A1 (en) 2011-02-17
RU2012109100A (en) 2013-10-20
RU2561355C2 (en) 2015-08-27
DE102009028501A1 (en) 2011-02-17
US8925522B2 (en) 2015-01-06
CN102725508B (en) 2015-05-20
JP5474192B2 (en) 2014-04-16

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