EP2795635B1 - Solenoid assembly with a residual air gap disc for a solenoid valve, solenoid valve as well as a method for producing a residual air gap disc - Google Patents

Solenoid assembly with a residual air gap disc for a solenoid valve, solenoid valve as well as a method for producing a residual air gap disc Download PDF

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Publication number
EP2795635B1
EP2795635B1 EP12803514.4A EP12803514A EP2795635B1 EP 2795635 B1 EP2795635 B1 EP 2795635B1 EP 12803514 A EP12803514 A EP 12803514A EP 2795635 B1 EP2795635 B1 EP 2795635B1
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EP
European Patent Office
Prior art keywords
air gap
residual air
gap disc
solenoid valve
magnet assembly
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EP12803514.4A
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German (de)
French (fr)
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EP2795635A1 (en
Inventor
Andreas Ellenschlaeger
Holger Rapp
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1638—Armatures not entering the winding
    • 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
    • F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts
    • 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
    • F02M2200/08—Fuel-injection apparatus having special means for influencing magnetic flux, e.g. for shielding or guiding magnetic flux
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F2007/1661—Electromagnets or actuators with anti-stick disc

Definitions

  • the invention relates to a magnet assembly for a solenoid valve for actuating fuel injectors having the features of the preamble of claim 1.
  • a magnet assembly comprises a residual air gap disc for forming a stroke stop for a liftable armature.
  • the invention furthermore relates to a method for producing a residual air gap disk for a magnet assembly according to the invention and to a magnet valve having such a magnet assembly.
  • the publication DE 10 2008 040 073 A1 describes a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve with a magnet assembly comprising a solenoid, a magnetic core and a liftable armature. Between the magnetic core and the armature, a residual air gap disk made of an amagnetic material is arranged as a stroke stop for the armature.
  • a residual air gap disc for a magnet assembly for actuating a fuel injector forth which is made of a ferromagnetic or non-magnetic material, such as a metallic foil, and has a simple geometry.
  • the arranged between the magnetic core and the armature residual air gap plate causes an attenuation of the armature stop and thus counteracts unwanted bouncing of the armature.
  • this can be arranged between the inner pole or the outer pole of the magnetic core and the armature.
  • the distance between the magnetic core and the armature minus the thickness of the residual air gap disc indicates the maximum armature stroke.
  • the contact of the stop surfaces with the fuel can lead to the formation of deposits, which change the armature stroke and thus lead to a different opening and closing behavior of the fuel injector.
  • the formation of deposits is conditioned by the aging or the reduced oxidation stability of the fuel.
  • Zinc or sodium in the fuel for example, can lead to the formation of aging polymers and metal soaps, which deposit on the surfaces.
  • additives, such as detergents, which actually serve to stabilize the biofuels can promote deposit formation.
  • an increased temperature contributes to the formation of deposits.
  • a magnet assembly for a solenoid valve is to be specified, in which the aforementioned problems do not occur or at least to a significantly reduced extent.
  • a magnet assembly with the features of claim 1 is proposed.
  • Advantageous developments of the invention are specified in the subclaims.
  • the object is further achieved by a solenoid valve having the features of claim 7.
  • a method for producing a residual air gap disc for a magnet assembly according to the invention is proposed.
  • the proposed for a solenoid valve for actuating fuel injectors magnetic assembly comprises a magnetic coil and an inner pole and an outer pole having magnetic core. Furthermore, the magnet assembly comprises a cooperating with the solenoid liftable armature and one between the armature and the magnetic core arranged residual air gap disc to form a stroke stop.
  • the residual air gap disk is made of covering-repellent plastic or contains such. The covering-repellent plastic contributes to the fact that on the surfaces of the residual air gap disc, in particular at the stop or contact surfaces of the residual air gap disc with the armature and / or the magnetic core, does not or at least to a significantly reduced extent to form undesirable deposits through which the Anchor stroke could be influenced or changed.
  • the magnetic assembly according to the invention supports a consistent opening and closing behavior of the fuel injector.
  • the scale-repellent plastic is or contains a silicone or a polyfluorinated hydrocarbon polymer, in particular polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • Such plastics have a very low surface tension, so that they have a coating repellent effect.
  • PTFE is very inert, so that surfaces formed therefrom are also protected against aggressive substances.
  • the coating-repellent plastic nanoscale aggregates lead to a roughness of the surfaces, which also counteracts a deposit formation.
  • the thickness of the residual air gap disc is adapted to the requirements of the respective material.
  • the residual air gap disc has a thickness of less than 80 microns, more preferably less than 50 microns.
  • a reinforcement in particular a metal grid, is embedded in the material of the residual air gap disk.
  • the reinforcement increases the robustness of the residual air gap disc.
  • the reinforcement counteracts an undesired deformation of the residual air gap disk, which likewise could influence or change the armature stroke.
  • Such a reinforcement has an advantageous effect, in particular with very thin residual air gap disks.
  • a method for producing a residual air gap disk of a magnet assembly according to the invention is proposed.
  • a metal mesh is coated with a coating-repellent plastic and then cured the plastic.
  • a coating-repellent plastic is coated with a coating-repellent plastic and then cured the plastic.
  • a solenoid valve for actuating fuel injectors with a magnetic assembly according to the invention is also proposed.
  • the magnet assembly according to the invention contributes to a consistent opening and closing behavior of the fuel injector.
  • the in the Fig. 1 illustrated magnet assembly 7 comprises a magnetic core 4, which forms an annular inner pole 2 and an annular outer pole 3. Between the inner pole 2 and the outer pole 3, a magnetic coil 1 is arranged. The solenoid coil 1 cooperates with a liftable armature 5, which is guided via an anchor bolt 8. The anchor bolt 8 passes through a central bore 9 of the magnetic core 4, in which further a supported on the anchor bolt 8 compression spring 10 is received for returning the armature 5.
  • the outer pole 3 of the magnetic core 4 is surrounded by a housing part 11.
  • the residual air gap disk 6 is in the present case made of a covering-repellent plastic.
  • the lining-repellent plastic contains In addition, nanoscale additives, which leads to a surface roughness of the residual air gap disc 6, which also acts as a repellent coating.
  • kidney-shaped recesses 12 which serve as flow openings. Number, shape and position of the recesses 12 may vary, so that in the Fig. 2 shown concrete embodiment of the residual air gap disc 6 is only an example.

Description

Die Erfindung betrifft eine Magnetbaugruppe für ein Magnetventil zur Betätigung von Kraftstoffinjektoren mit den Merkmalen des Oberbegriffs des Anspruchs 1. Eine solche Magnetbaugruppe umfasst eine Restluftspaltscheibe zur Ausbildung eines Hubanschlags für einen hubbeweglichen Anker. Gegenstand der Erfindung ist ferner ein Verfahren zur Herstellung einer Restluftspaltscheibe für eine erfindungsgemäße Magnetbaugruppe sowie ein Magnetventil mit einer solchen Magnetbaugruppe.The invention relates to a magnet assembly for a solenoid valve for actuating fuel injectors having the features of the preamble of claim 1. Such a magnet assembly comprises a residual air gap disc for forming a stroke stop for a liftable armature. The invention furthermore relates to a method for producing a residual air gap disk for a magnet assembly according to the invention and to a magnet valve having such a magnet assembly.

Stand der TechnikState of the art

Die Offenlegungsschrift DE 10 2008 040 073 A1 beschreibt ein Magnetventil zur Steuerung des Kraftstoffdrucks in einem Steuerraum eines Einspritzventils mit einer Magnetbaugruppe, welche eine Magnetspule, einen Magnetkern und einen hubbeweglichen Anker umfasst. Zwischen dem Magnetkern und dem Anker ist eine Restluftspaltscheibe aus einem amagnetischen Material als Hubanschlag für den Anker angeordnet.The publication DE 10 2008 040 073 A1 describes a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve with a magnet assembly comprising a solenoid, a magnetic core and a liftable armature. Between the magnetic core and the armature, a residual air gap disk made of an amagnetic material is arranged as a stroke stop for the armature.

Aus der Offenlegungsschrift DE 10 2009 003 213 A1 geht ferner eine Restluftspaltscheibe für eine Magnetbaugruppe zur Betätigung eines Kraftstoffinjektors hervor, welche aus einem ferromagnetischen oder nicht-magnetischen Material, beispielsweise einer metallischen Folie, hergestellt ist und eine einfache Geometrie besitzt.From the publication DE 10 2009 003 213 A1 Furthermore, a residual air gap disc for a magnet assembly for actuating a fuel injector forth, which is made of a ferromagnetic or non-magnetic material, such as a metallic foil, and has a simple geometry.

Aus der WO 03/002868 A1 ist eine Distanzscheibe aus einem nicht-magnetischen Material bekannt. Weiter ist aus der DE 10 2008 001891 A1 eine Distanzscheibe bekannt, deren Dicke zwischen 50 µm und 200 µm liegt.From the WO 03/002868 A1 a spacer made of a non-magnetic material is known. Next is from the DE 10 2008 001891 A1 a spacer known whose thickness is between 50 microns and 200 microns.

Die zwischen dem Magnetkern und dem Anker angeordnete Restluftspaltscheibe bewirkt eine Dämpfung des Ankeranschlags und wirkt somit unerwünschten Prellvorgängen des Ankers entgegen. In Abhängigkeit von der konkreten Ausgestaltung der Restluftspaltscheibe kann diese zwischen dem Innenpol oder dem Außenpol des Magnetkerns und dem Anker angeordnet sein. Der Abstand zwischen Magnetkern und Anker abzüglich der Dicke der Restluftspaltscheibe gibt den maximalen Ankerhub an.The arranged between the magnetic core and the armature residual air gap plate causes an attenuation of the armature stop and thus counteracts unwanted bouncing of the armature. Depending on the specific design of the residual air gap disk this can be arranged between the inner pole or the outer pole of the magnetic core and the armature. The distance between the magnetic core and the armature minus the thickness of the residual air gap disc indicates the maximum armature stroke.

Bei Einsatz einer solchen Magnetbaugruppe in einem Magnetventil zur Betätigung eines Kraftstoffinjektors kann der Kontakt der Anschlagflächen mit dem Kraftstoff dazu führen, dass sich Beläge ausbilden, welche den Ankerhub verändern und auf diese Weise zu einem abweichenden Öffnungs- und Schließverhalten des Kraftstoffinjektors führen. In der Regel ist die Belagbildung durch die Alterung bzw. die verminderte Oxidationsstabilität des Kraftstoffs bedingt. Zink- oder Natriumanteile im Kraftstoff können beispielsweise zur Ausbildung von Alterungspolymeren und Metallseifen führen, die sich an den Oberflächen ablagern. Durch die zunehmende Beimischung von Biokraftstoff zum Dieselkraftstoff kann es zudem vermehrt zu Ablagerungen kommen. Insbesondere können Additive, wie beispielsweise Detergenzien, die eigentlich der Stabilisierung der Biokraftstoffe dienen, eine Belagbildung fördern. Ferner trägt eine erhöhte Temperatur zur Belagbildung bei.When using such a magnet assembly in a solenoid valve for actuating a fuel injector, the contact of the stop surfaces with the fuel can lead to the formation of deposits, which change the armature stroke and thus lead to a different opening and closing behavior of the fuel injector. In general, the formation of deposits is conditioned by the aging or the reduced oxidation stability of the fuel. Zinc or sodium in the fuel, for example, can lead to the formation of aging polymers and metal soaps, which deposit on the surfaces. The increasing addition of biofuel to diesel fuel can also lead to increased deposits. In particular, additives, such as detergents, which actually serve to stabilize the biofuels, can promote deposit formation. Furthermore, an increased temperature contributes to the formation of deposits.

Ausgehend von dem vorstehend genannten Stand der Technik soll eine Magnetbaugruppe für ein Magnetventil angegeben werden, bei welcher die vorstehend genannten Probleme nicht oder zumindest in deutlich vermindertem Maße auftreten.Based on the above-mentioned prior art, a magnet assembly for a solenoid valve is to be specified, in which the aforementioned problems do not occur or at least to a significantly reduced extent.

Zur Lösung der Aufgabe wird eine Magnetbaugruppe mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Die Aufgabe wird ferner gelöst durch ein Magnetventil mit den Merkmalen des Anspruchs 7. Darüber hinaus wird ein Verfahren zur Herstellung einer Restluftspaltscheibe für eine erfindungsgemäße Magnetbaugruppe vorgeschlagen.To solve the problem, a magnet assembly with the features of claim 1 is proposed. Advantageous developments of the invention are specified in the subclaims. The object is further achieved by a solenoid valve having the features of claim 7. In addition, a method for producing a residual air gap disc for a magnet assembly according to the invention is proposed.

Offenbarung der ErfindungDisclosure of the invention

Die für ein Magnetventil zur Betätigung von Kraftstoffinjektoren vorgeschlagene Magnetbaugruppe umfasst eine Magnetspule sowie einen Innenpol und einen Außenpol aufweisenden Magnetkern. Ferner umfasst die Magnetbaugruppe einen mit der Magnetspule zusammenwirkenden hubbeweglichen Anker sowie eine zwischen dem Anker und dem Magnetkern angeordnete Restluftspaltscheibe zur Ausbildung eines Hubanschlags. Erfindungsgemäß ist die Restluftspaltscheibe aus belagabweisendem Kunststoff hergestellt oder enthält einen solchen. Der belagabweisende Kunststoff trägt dazu bei, dass es an den Oberflächen der Restluftspaltscheibe, insbesondere an den Anschlag- bzw. Kontaktflächen der Restluftspaltscheibe mit dem Anker und/oder dem Magnetkern, nicht oder zumindest in deutlich vermindertem Maße zur Ausbildung unerwünschter Beläge kommt, durch welche der Ankerhub beeinflusst bzw. verändert werden könnte. Vorzugsweise bestehen daher zumindest die Anschlag- bzw. Kontaktflächen der Restluftspaltscheibe mit dem Anker und/oder dem Magnetkern aus belagabweisendem Kunststoff. In einem Magnetventil zur Betätigung eines Kraftstoffinjektors unterstützt die erfindungsgemäße Magnetbaugruppe ein gleich bleibendes Öffnungs- und Schließverhalten des Kraftstoffinjektors.The proposed for a solenoid valve for actuating fuel injectors magnetic assembly comprises a magnetic coil and an inner pole and an outer pole having magnetic core. Furthermore, the magnet assembly comprises a cooperating with the solenoid liftable armature and one between the armature and the magnetic core arranged residual air gap disc to form a stroke stop. According to the invention, the residual air gap disk is made of covering-repellent plastic or contains such. The covering-repellent plastic contributes to the fact that on the surfaces of the residual air gap disc, in particular at the stop or contact surfaces of the residual air gap disc with the armature and / or the magnetic core, does not or at least to a significantly reduced extent to form undesirable deposits through which the Anchor stroke could be influenced or changed. Preferably, therefore, there are at least the stop or contact surfaces of the residual air gap disc with the armature and / or the magnetic core of lining-repellent plastic. In a solenoid valve for actuating a fuel injector, the magnetic assembly according to the invention supports a consistent opening and closing behavior of the fuel injector.

Vorzugsweise ist oder enthält der belagabweisende Kunststoff ein Silikon oder ein polyflouriertes Kohlenwasserstoffpolymer, insbesondere Polytetrafluorethylen (PTFE). Derartige Kunststoffe weisen eine sehr niedrige Oberflächenspannung auf, so dass sie belagabweisend wirken. PTFE ist darüber hinaus sehr reaktionsträge, so dass hieraus ausgebildete Oberflächen zudem vor aggressiven Substanzen geschützt sind.Preferably, the scale-repellent plastic is or contains a silicone or a polyfluorinated hydrocarbon polymer, in particular polytetrafluoroethylene (PTFE). Such plastics have a very low surface tension, so that they have a coating repellent effect. In addition, PTFE is very inert, so that surfaces formed therefrom are also protected against aggressive substances.

Gemäß einer bevorzugten Ausführungsform der Erfindung enthält der belagabweisende Kunststoff nanoskalige Zuschläge. Die nanoskaligen Zuschläge führen zu einer Rauhigkeit der Oberflächen, welche ebenfalls einer Belagbildung entgegen wirkt.According to a preferred embodiment of the invention, the coating-repellent plastic nanoscale aggregates. The nanoscale additives lead to a roughness of the surfaces, which also counteracts a deposit formation.

Die Dicke der Restluftspaltscheibe wird den Erfordernissen des jeweiligen Werkstoffs angepasst. Vorzugsweise besitzt die Restluftspaltscheibe eine Dicke von weniger als 80 µm, weiterhin vorzugsweise von weniger als 50 µm.The thickness of the residual air gap disc is adapted to the requirements of the respective material. Preferably, the residual air gap disc has a thickness of less than 80 microns, more preferably less than 50 microns.

Erfindungsgemäß ist in den Werkstoff der Restluftspaltscheibe eine Armierung, insbesondere ein Metallgitter, eingebettet.According to the invention, a reinforcement, in particular a metal grid, is embedded in the material of the residual air gap disk.

Durch die Armierung wird die Robustheit der Restluftspaltscheibe erhöht. Insbesondere wirkt die Armierung einer unerwünschten Verformung der Restluftspaltscheibe entgegen, welche ebenfalls den Ankerhub beeinflussen bzw. verändern könnte. Eine solche Armierung wirkt sich insbesondere bei sehr dünnen Restluftspaltscheiben als vorteilhaft aus.The reinforcement increases the robustness of the residual air gap disc. In particular, the reinforcement counteracts an undesired deformation of the residual air gap disk, which likewise could influence or change the armature stroke. Such a reinforcement has an advantageous effect, in particular with very thin residual air gap disks.

Des Weiteren wird ein Verfahren zur Herstellung einer Restluftspaltscheibe einer erfindungsgemäßen Magnetbaugruppe vorgeschlagen. Bei diesem Verfahren wird ein Metallgitter mit einem belagabweisenden Kunststoff umspritzt und der Kunststoff anschließend ausgehärtet. Auf diese Weise lassen sich sehr dünne und zugleich robuste, insbesondere formsteife, Restluftspaltscheiben herstellen.Furthermore, a method for producing a residual air gap disk of a magnet assembly according to the invention is proposed. In this method, a metal mesh is coated with a coating-repellent plastic and then cured the plastic. In this way it is possible to produce very thin and at the same time robust, in particular dimensionally stable, residual air gap disks.

Zur Lösung der eingangs genannten Aufgabe wird ferner ein Magnetventil zur Betätigung von Kraftstoffinjektoren mit einer erfindungsgemäßen Magnetbaugruppe vorgeschlagen. Die erfindungsgemäße Magnetbaugruppe trägt zu einem gleich bleibendem Öffnungs- und Schließverhalten des Kraftstoffinjektors bei.To solve the object mentioned above, a solenoid valve for actuating fuel injectors with a magnetic assembly according to the invention is also proposed. The magnet assembly according to the invention contributes to a consistent opening and closing behavior of the fuel injector.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

  • Fig. 1 einen schematischen Längsschnitt durch ein Magnetventil mit einer erfindungsgemäßen Magnetbaugruppe und
  • Fig. 2 eine Draufsicht auf die Restluftspaltscheibe der Magnetbaugruppe der Fig. 1.
A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings. These show:
  • Fig. 1 a schematic longitudinal section through a solenoid valve with a magnetic assembly according to the invention and
  • Fig. 2 a plan view of the residual air gap disk of the magnet assembly of Fig. 1 ,

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in der Fig. 1 dargestellte erfindungsgemäße Magnetbaugruppe 7 umfasst einen Magnetkern 4, welcher einen ringförmigen Innenpol 2 und einen ringförmigen Außenpol 3 ausbildet. Zwischen dem Innenpol 2 und dem Außenpol 3 ist eine Magnetspule 1 angeordnet. Die Magnetspule 1 wirkt mit einem hubbeweglichen Anker 5 zusammen, welcher über einen Ankerbolzen 8 geführt ist. Der Ankerbolzen 8 durchsetzt eine zentrale Bohrung 9 des Magnetkerns 4, in welcher ferner eine am Ankerbolzen 8 abgestützte Druckfeder 10 zur Rückstellung des Ankers 5 aufgenommen ist. Der Außenpol 3 des Magnetkerns 4 ist von einem Gehäuseteil 11 umgeben.The in the Fig. 1 illustrated magnet assembly 7 according to the invention comprises a magnetic core 4, which forms an annular inner pole 2 and an annular outer pole 3. Between the inner pole 2 and the outer pole 3, a magnetic coil 1 is arranged. The solenoid coil 1 cooperates with a liftable armature 5, which is guided via an anchor bolt 8. The anchor bolt 8 passes through a central bore 9 of the magnetic core 4, in which further a supported on the anchor bolt 8 compression spring 10 is received for returning the armature 5. The outer pole 3 of the magnetic core 4 is surrounded by a housing part 11.

Am Außenpol 3 des Magnetkerns 4 liegt eine Restluftspaltscheibe 6 an, welche der Ausbildung eines Hubanschlags dient. Die Restluftspaltscheibe 6 ist vorliegend aus einem belagabweisenden Kunststoff hergestellt. Der belagabweisende Kunststoff enthält zudem nanoskalige Zuschläge, welche zu einer Oberflächenrauhigkeit der Restluftspaltscheibe 6 führt, die ebenfalls belagabweisend wirkt.At the outer pole 3 of the magnetic core 4 is a residual air gap disk 6, which serves to form a stroke stop. The residual air gap disc 6 is in the present case made of a covering-repellent plastic. The lining-repellent plastic contains In addition, nanoscale additives, which leads to a surface roughness of the residual air gap disc 6, which also acts as a repellent coating.

Wie der in der Fig. 2 dargestellten Draufsicht auf die Restluftspaltscheibe 6 der Magnetbaugruppe 7 zu entnehmen ist, weist diese drei nierenförmige Ausnehmungen 12 auf, welche als Durchströmöffnungen dienen. Anzahl, Form und Lage der Ausnehmungen 12 können variieren, so dass die in der Fig. 2 dargestellte konkrete Ausgestaltung der Restluftspaltscheibe 6 nur beispielhaft ist.Like the one in the Fig. 2 shown plan view of the residual air gap disk 6 of the magnet assembly 7 can be seen, has these three kidney-shaped recesses 12, which serve as flow openings. Number, shape and position of the recesses 12 may vary, so that in the Fig. 2 shown concrete embodiment of the residual air gap disc 6 is only an example.

Claims (6)

  1. Magnet assembly for a solenoid valve for actuating fuel injectors, comprising magnet core (4) which has a magnet coil (1) and an inner pole (2) and an outer pole (3), furthermore comprising an armature (5) which interacts with the magnet coil (1) and which can perform stroke movements, and a residual air gap disc (6) which is arranged between the armature (5) and the magnet core (4) and which serves for forming a stroke stop, wherein the residual air gap disc (6) is produced from or comprises film-repellent plastic, characterized in that a reinforcement, in particular a metal mesh, is embedded into the material of the residual air gap disc (6).
  2. Magnet assembly according to Claim 1, characterized in that the film-repellent plastic is or comprises a silicone or a polyfluorinated hydrocarbon polymer.
  3. Magnet assembly according to Claim 1 or 2, characterized in that the film-repellent plastic comprises nanoscale additives.
  4. Magnet assembly according to any of the preceding claims,
    characterized in that the residual air gap disc (6) has a thickness of less than 80 µm, preferably of less than 50 µm.
  5. Method for producing a residual air gap disc (6) of a magnet assembly (7) according to any of the preceding claims,
    characterized in that a metal mesh is encapsulated with a film-repellent plastic, and the plastic is subsequently cured.
  6. Solenoid valve for actuating fuel injectors having a magnet assembly (7) according to any of Claims 1 to 4.
EP12803514.4A 2011-12-20 2012-12-17 Solenoid assembly with a residual air gap disc for a solenoid valve, solenoid valve as well as a method for producing a residual air gap disc Active EP2795635B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089127A DE102011089127A1 (en) 2011-12-20 2011-12-20 Magnetic assembly with a residual air gap disc for a solenoid valve, solenoid valve and method for producing a residual air gap disc
PCT/EP2012/075713 WO2013092461A1 (en) 2011-12-20 2012-12-17 Solenoid assembly with a residual air gap disc for a solenoid valve, solenoid valve as well as a method for producing a residual air gap disc

Publications (2)

Publication Number Publication Date
EP2795635A1 EP2795635A1 (en) 2014-10-29
EP2795635B1 true EP2795635B1 (en) 2019-02-27

Family

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EP12803514.4A Active EP2795635B1 (en) 2011-12-20 2012-12-17 Solenoid assembly with a residual air gap disc for a solenoid valve, solenoid valve as well as a method for producing a residual air gap disc

Country Status (4)

Country Link
EP (1) EP2795635B1 (en)
CN (1) CN104025214B (en)
DE (1) DE102011089127A1 (en)
WO (1) WO2013092461A1 (en)

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DE102013212238A1 (en) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Solenoid valve and fuel injector with such a solenoid valve
DE102014218594A1 (en) * 2014-09-16 2016-03-17 Robert Bosch Gmbh Piston pump with an area with a non-magnetic material in the magnetic circuit
CN105895299B (en) * 2016-05-19 2018-04-17 哈尔滨工程大学 Non-crystaline amorphous metal composite iron core high-speed electro-magnet
DE102018200848A1 (en) * 2018-01-19 2019-07-25 Continental Automotive Gmbh Electromagnetic switching valve
CN108278168A (en) * 2018-03-28 2018-07-13 南岳电控（衡阳）工业技术股份有限公司 A kind of fuel oil injector with modified power transmission component
DE102021133281A1 (en) * 2021-12-15 2023-06-15 Liebherr-Components Deggendorf Gmbh Electromagnetic valve, in particular for switching a fuel injector

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DE10131199A1 (en) * 2001-06-28 2003-01-16 Bosch Gmbh Robert Solenoid valve for controlling an injection valve of an internal combustion engine
DE10131201A1 (en) * 2001-06-28 2003-01-16 Bosch Gmbh Robert Solenoid valve for controlling an injection valve of an internal combustion engine
DE102008001891A1 (en) * 2008-05-21 2009-11-26 Robert Bosch Gmbh Residual air gap disc
DE102008040073A1 (en) 2008-07-02 2010-01-07 Robert Bosch Gmbh Air gap limitation with solenoid valve
PL2197002T3 (en) * 2008-12-15 2012-02-29 Kendrion Eibiswald Gmbh Electromagnet with cushioning disc
DE102009003213A1 (en) 2009-05-19 2010-11-25 Robert Bosch Gmbh Residual air gap disc
CN201515037U (en) * 2009-07-10 2010-06-23 陈士俊 Strengthening rib hot-melting clamp core
CN102241890A (en) * 2011-06-08 2011-11-16 周良文 Nano plastic powder

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Also Published As

Publication number Publication date
EP2795635A1 (en) 2014-10-29
CN104025214A (en) 2014-09-03
CN104025214B (en) 2018-01-09
DE102011089127A1 (en) 2013-06-20
WO2013092461A1 (en) 2013-06-27

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