EP2905460B1 - Residual air dividing disc for a magnetic assembly of a solenoid valve and method for producing a residual air dividing disc - Google Patents

Residual air dividing disc for a magnetic assembly of a solenoid valve and method for producing a residual air dividing disc Download PDF

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Publication number
EP2905460B1
EP2905460B1 EP15152803.1A EP15152803A EP2905460B1 EP 2905460 B1 EP2905460 B1 EP 2905460B1 EP 15152803 A EP15152803 A EP 15152803A EP 2905460 B1 EP2905460 B1 EP 2905460B1
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EP
European Patent Office
Prior art keywords
residual air
air gap
gap disc
disc
magnet
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Not-in-force
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EP15152803.1A
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German (de)
French (fr)
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EP2905460A1 (en
Inventor
Jochen Wessner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2905460A1 publication Critical patent/EP2905460A1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • 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
    • F02M2200/9053—Metals
    • F02M2200/9069—Non-magnetic metals
    • 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 magnetic assembly of a solenoid valve with a residual air gap disk according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a residual air gap disk according to the invention.
  • a magnetic assembly with a residual air gap disk according to the preamble of claim 1 is known from DE 10 2009 003 213 A1 the applicant known.
  • the known residual air gap disc is made in the form of a metal foil made of a ferromagnetic or non-magnetic material and formed in the form of a circular ring.
  • Such a residual air gap disc is used in a magnetic assembly of a solenoid valve to prevent magnetic adhesion of the armature on the front side of the magnetic core when the armature is in the magnetic core facing the end position in which the residual air gap disc forms a mechanical stop.
  • Such an end position is typically taken in an injection valve with a magnet assembly when an at least indirectly actuated by means of the armature injection member for injecting fuel is lifted from a valve seat.
  • the invention has the object, a magnetic assembly of a solenoid valve with a residual air gap according to the preamble of claim 1 such that a comparison with the prior art simplified handling with relatively simple and cost manufacturability of the residual air gap disc is made possible.
  • This object is achieved in a magnetic assembly with a residual air gap disc with the features of claim 1, characterized in that the residual air gap disc is at least substantially rigid and consists of a consisting of ferromagnetic material body, which is connected to a non-magnetic element.
  • the residual air gap disc according to the invention has a significantly greater thickness to allow the desired rigidity of the residual air gap disc.
  • the residual air gap disk next to the non-magnetic element instead of a
  • consisting of a non-magnetic material, foil-like residual air gap disc in addition, consisting of a ferromagnetic material base member which serves to allow the required stiffness of the residual air gap disc.
  • Substantially rigid is understood according to the invention to mean that the residual air gap disk has such a rigidity that it can be elastically deformed either only with relatively great force and is otherwise plastically deformable.
  • Such a design of a residual air gap disc according to the invention makes it possible on the one hand, due to the great rigidity or thickness of the residual air gap disc, to incorporate these into the manufacturing process of the magnet assembly in a particularly simple manner and, in particular, to enable relatively simple handling.
  • the high rigidity furthermore achieves the advantage that, for example, a frictional connection between the residual air gap disk and a magnetic armature or a magnetic core can be produced particularly easily.
  • the non-magnetic element is formed as a cladding.
  • the advantage of plating is in particular that a relatively simple adjustment of the thickness of the non-magnetic element is made possible, and that a connection between the base body and the non-magnetic element is made possible in an economically advantageous manner without additional connecting means.
  • the geometric dimensions of the residual air gap disk provide that the thickness of the main body is between 0.15 mm and 1.75 mm, the thickness of the non-magnetic element between 5 ⁇ m and 75 ⁇ m. Such a dimensioning of the base body and the non-magnetic element allows for a formation of the required stiffness of the residual air gap disc and beyond the desired thin or small residual air gap between the magnetic core and the armature.
  • the residual air gap disc within the magnet assembly occupies a defined position that does not change during operation. Due to the high rigidity of the residual air gap disc, a large variety of possible connection techniques with the armature or the magnetic core is made possible. Thus, it is conceivable in a first embodiment that the residual air gap disc is adapted to be connected to the magnetic core by a non-positive and / or positive connection. Alternatively, however, it is also possible that the residual air gap disc is designed to be connected to the magnetic core by a non-positive and / or positive connection.
  • the residual air gap disk has an uneven surface shape on the side facing the magnet core or the magnet armature.
  • Such an uneven surface shape can be used, for example, for damping the movement of the magnet armature and can be particularly easily achieved, for example, by an embossing process of the residual air gap disk.
  • the invention also includes a method for producing a residual air gap disk for a magnet assembly according to the invention.
  • a non-magnetic, also formed as an endless belt element is applied to an existing ferromagnetic material formed as an endless belt body by plating, and then that the residual air gap disc is produced by punching out of the formed by the two bands raw tape ,
  • Such a method according to the invention enables a particularly simple and cost-effective production of residual air gap disks according to the invention.
  • the residual air gap disk is deformed at least in regions.
  • Such deformation serves, as stated above, in particular for forming an uneven surface shape of the residual air gap disk for influencing functional properties of the magnet assembly.
  • a solenoid assembly 100 of a solenoid valve is shown, which is part of a fuel injector 1 for injecting fuel into the combustion chamber of an internal combustion engine, in particular in the combustion chamber of a self-igniting internal combustion engine.
  • the magnet assembly 100 is arranged within a housing 11, in particular the injector housing, and comprises at least one magnetic core 12 in the form of a disc in the exemplary embodiment, in which a magnetic coil 13 is inserted in an annular circumferential depression.
  • the magnetic core 12 and the magnetic coil 13 cooperate with a likewise substantially disk-shaped magnet armature 15, which merges on the side facing away from the magnetic core 12 in a pin-shaped portion 16 which as Valve member is formed in the form of a nozzle needle or at least indirectly operatively connected to a valve member (nozzle needle) is arranged to release the nozzle needle for releasing injection openings, not shown in the housing 11 and to close.
  • Valve member is formed in the form of a nozzle needle or at least indirectly operatively connected to a valve member (nozzle needle) is arranged to release the nozzle needle for releasing injection openings, not shown in the housing 11 and to close.
  • the magnetic core 12 has a centrally disposed through hole 17 which is penetrated by a compression spring 18, whose one end abuts against the end face of the armature 15 and this pushes away in the direction of the magnetic core 12 to the (not shown) injection openings through the valve member close.
  • the magnet coil 13 When the magnet coil 13 is energized, the armature 15 is pulled against the spring force of the compression spring 18 in the direction of the magnet core 12.
  • a residual air gap disc according to the invention 10 arranged.
  • the substantially ring-shaped or disc-shaped residual air gap disc 10 as in particular with reference to the Fig. 2 It can be seen from a basic body 21 made of ferromagnetic material and a non - magnetic material element 22 connected to the main body 21.
  • the element 22 is arranged on the side facing the magnet armature 15.
  • the non-magnetic element 22, which is in the form of a cladding 23 provides and is connected to the main body 21, for the magnetic separation between the armature 15 and the magnetic core 12.
  • the non-magnetic element 22 is made of, for example, a stainless steel material or the like. and has a thickness between 5 ⁇ m and 75 ⁇ m.
  • the residual air gap disc 10 for example, on a pitch circle diameter arranged, small recesses 24 or a slot 25, several thin slits o.ä. exhibit.
  • the residual air gap disc 10 for this purpose by way of example, and not limiting, extending in the longitudinal direction, radially encircling edge 26 which engages in a formed on the magnetic core 12, also radially circumferential recess 27 in the form of a groove, for example, caused by a crimping tool or similar
  • edge 26 is merely in the form of webs or the like. is formed, wherein the webs are preferably arranged at equal angular intervals to each other.
  • the attachment of the residual air gap disk 10 can additionally or alternatively take place on the inner circumference of the magnetic core 12.
  • connection between the residual air gap disk 10 and the magnetic core 12 is thus designed as a non-positive and / or positive connection.
  • a residual air gap disk 10a is shown, in which the residual air gap disk 10a is connected to the magnet armature 15a.
  • the connection between the residual air gap disk 10a and the magnet armature 15a takes place analogously to the connection between the residual air gap disk 10 and the magnetic core 12 in the case of Fig. 2 by a radially encircling edge 28 of the residual air gap disc 10a, which projects in regions radially inwardly into a recess 29 of the magnet armature 15a.
  • the element 22 is arranged on the side facing away from the magnet armature 15a.
  • FIG. 2 shows a part of a production device 50 for producing residual air gap disks 10, 10a for a magnet assembly according to the invention.
  • the manufacturing device 50 comprises two parallel The two press rolls 51, 52 are supplied to each other covering sections of the main body 21 and of the nonmagnetic element 22 which are stored in the form of endless belts 53, 54, wherein a corresponding arrangement of the two press rolls 51, 52 with a small gap between the two press rollers 51, 52, the non-magnetic element 22 is rolled onto the ferromagnetic base body 21, this process being referred to as plating.
  • plating this case, an intimate connection of the material of the main body 21 with the material of the non-magnetic element 22 takes place.
  • the residual air gap disks 10, 10a are punched out of the (one-piece) raw strip 55 by a stamping process.

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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)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Magnetbaugruppe eines Magnetventils mit einer Restluftspaltscheibe nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung ein Verfahren zum Herstellen einer erfindungsgemäßen Restluftspaltscheibe.The invention relates to a magnetic assembly of a solenoid valve with a residual air gap disk according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a residual air gap disk according to the invention.

Eine Magnetbaugruppe mit einer Restluftspaltscheibe nach dem Oberbegriff des Anspruchs 1 ist aus der DE 10 2009 003 213 A1 der Anmelderin bekannt. Die bekannte Restluftspaltscheibe ist in Form einer Metallfolie aus einem ferromagnetischen oder nicht-magnetischen Material gefertigt und in Form eines Kreisrings ausgebildet. Eine derartige Restluftspaltscheibe dient in einer Magnetbaugruppe eines Magnetventils dazu, ein magnetisches Anhaften des Magnetankers an der Stirnseite des Magnetkerns zu verhindern, wenn sich der Magnetanker in der dem Magnetkern zugewandten Endposition befindet, in der die Restluftspaltscheibe einen mechanischen Anschlag ausbildet. Eine derartige Endposition wird bei einem Einspritzventil mit einer Magnetbaugruppe typischerweise dann eingenommen, wenn ein mittels des Magnetankers zumindest mittelbar betätigbares Einspritzglied zum Einspritzen von Kraftstoff von einem Ventilsitz abgehoben ist. Wünschenswert sind relativ geringe Axialspalte zwischen dem Magnetanker und dem Magnetkern, so dass in der Praxis die Restluftspaltscheiben beispielsweise eine Dicke von etwa 0,05 mm aufweisen. Bei einer derartigen Dicke einer Restluftspaltscheibe ergibt sich zwangsläufig eine hohe Flexibilität der Restluftspaltscheibe, die das Handling insofern erschwert, als dass eine Montage der Restluftspaltscheibe am Magnetanker bzw. am Magnetkern relativ komplex und aufwendig ist. Darüber hinaus ist alleine schon die Montage derartig dünner Restluftspaltscheiben aufgrund der hohen Elastizität relativ schwierig und bedarf spezieller Werkzeuge.A magnetic assembly with a residual air gap disk according to the preamble of claim 1 is known from DE 10 2009 003 213 A1 the applicant known. The known residual air gap disc is made in the form of a metal foil made of a ferromagnetic or non-magnetic material and formed in the form of a circular ring. Such a residual air gap disc is used in a magnetic assembly of a solenoid valve to prevent magnetic adhesion of the armature on the front side of the magnetic core when the armature is in the magnetic core facing the end position in which the residual air gap disc forms a mechanical stop. Such an end position is typically taken in an injection valve with a magnet assembly when an at least indirectly actuated by means of the armature injection member for injecting fuel is lifted from a valve seat. Desirable are relatively small axial gaps between the armature and the magnetic core, so that in practice the residual air gap disks, for example, have a thickness of about 0.05 mm. With such a thickness of a residual air gap disk inevitably results in a high flexibility of the residual air gap disc, which complicates the handling insofar as that a mounting of the residual air gap disc on the armature or on the magnetic core is relatively complex and expensive. In addition, even the installation of such thin residual air gap discs is relatively difficult due to the high elasticity and requires special tools.

Weiterhin ist es insbesondere bei solchen Restluftspaltscheiben, die aus einem ferromagnetischen Material bestehen, bekannt, entweder den Magnetanker oder den Magnetkern auf der der Restluftspaltscheibe zugewandten Seite mit einer nichtmagnetischen Beschichtung zu versehen, um das oben angesprochene Anhaften der Bauteile zu vermeiden. Eine derartige Beschichtung, insbesondere im Bereich einer Stirnfläche des Magnetkerns bzw. des Magnetankers ist jedoch ebenfalls relativ aufwendig und kostenintensiv.
Aus der DE 10 2009 001 706 A1 sowie der DE 10 2008 001 891 der Anmelderin sind weitere, gattungsgemäße Magnetbaugruppen mit Restluftspaltscheiben bekannt, die insbesondere relativ großflächige Aussparungen bzw. Einschnitte aufweisen, was deren Herstellung sowie Handling zusätzlich erschwert. DE 3501973 offenbart eine weitere Magnetbaugruppe eines Magnetventils.Furthermore, it is particularly known in such residual air gap disks, which consist of a ferromagnetic material, to provide either the magnet armature or the magnetic core on the side facing the residual air gap disk with a non-magnetic coating in order to avoid the above-mentioned adhesion of the components. However, such a coating, in particular in the region of an end face of the magnetic core or of the magnet armature, is likewise relatively complicated and cost-intensive.
From the DE 10 2009 001 706 A1 as well as the DE 10 2008 001 891 The Applicant further generic magnet assemblies are known with residual air gap discs, which in particular have relatively large recesses or incisions, which further complicates their production and handling. DE 3501973 discloses another solenoid assembly of a solenoid valve.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Magnetbaugruppe eines Magnetventils mit einer Restluftspaltscheibe nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass ein gegenüber dem Stand der Technik vereinfachtes Handling bei relativ einfacher und kostengünstiger Herstellbarkeit der Restluftspaltscheibe ermöglicht wird.
Diese Aufgabe wird erfindungsgemäß bei einer Magnetbaugruppe mit einer Restluftspaltscheibe mit den Merkmalen des Anspruchs 1 dadurch gelöst, dass die Restluftspaltscheibe zumindest im Wesentlichen starr ausgebildet ist und aus einem aus ferromagnetischem Material bestehenden Grundkörper besteht, der mit einem nichtmagnetischen Element verbunden ist. Mit anderen Worten gesagt bedeutet dies, dass anstelle einer gemäß dem Stand der Technik aus einer zur Erzielung eines möglichst kleinen Restluftspalts dünnen Restluftspaltscheibe die erfindungsgemäße Restluftspaltscheibe eine bedeutend größere Dicke aufweist, um die gewünschte Starrheit der Restluftspaltscheibe zu ermöglichen. Um darüber hinaus trotz der relativ großen Dicke der Restluftspaltscheibe einen möglichst geringen Restluftspalt einstellen zu können, weist die Restluftspaltscheibe neben dem nichtmagnetischen Element, das anstelle einer aus einem nichtmagnetischen Material bestehenden, folienartigen Restluftspaltscheibe verwendet wird, zusätzlich ein aus ferromagnetischem Material bestehendes Grundelement auf, das dazu dient, die benötigte Steifigkeit der Restluftspaltscheibe zu ermöglichen. Unter "im Wesentlichen starr" wird erfindungsgemäß verstanden, dass die Restluftspaltscheibe eine derartige Steifigkeit aufweist, das sich diese entweder nur mit verhältnismäßig großer Kraft elastisch verformen lässt und ansonsten plastisch verformbar ist.
Eine derartige Ausbildung einer erfindungsgemäßen Restluftspaltscheibe ermöglicht es zum einen, durch die große Steifigkeit bzw. Dicke der Restluftspaltscheibe diese besonders einfach in den Fertigungsprozess der Magnetbaugruppe einzugliedern und insbesondere ein relativ einfaches Handling zu ermöglichen. Weiterhin wird durch die hohe Steifigkeit darüber hinaus der Vorteil erzielt, dass beispielsweise eine kraftschlüssige Verbindung zwischen der Restluftspaltscheibe und einem Magnetanker oder einem Magnetkern besonders einfach herstellbar ist.
Vorteilhafte Weiterbildungen der erfindungsgemäßen Magnetbaugruppe eines Magnetventils mit einer Restluftspaltscheibe sind in den Unteransprüchen aufgeführt. Erfindungsgemäß ist es vorgesehen, dass das nichtmagnetische Element als Plattierung ausgebildet ist. Der Vorteil einer Plattierung besteht insbesondere darin, dass eine relativ einfache Einstellung der Dicke des nichtmagnetischen Elements ermöglicht wird, und dass ohne zusätzliche Verbindungsmittel eine Verbindung zwischen dem Grundkörper und dem nichtmagnetischen Element auf wirtschaftlich vorteilhafte Art und Weise ermöglicht wird. Erfindungsgemäß sehen die geometrischen Dimensionierungen der Restluftspaltscheibe vor, dass die Dicke des Grundkörpers zwischen 0,15mm und 1,75mm die Dicke des nichtmagnetischen Elements zwischen 5µm und 75µm beträgt. Eine derartige Dimensionierung des Grundkörpers sowie des nichtmagnetischen Elements ermöglicht zum einen die Ausbildung der benötigten Steifigkeit der Restluftspaltscheibe und darüber hinaus den gewünscht dünnen bzw. kleinen Restluftspalt zwischen dem Magnetkern und dem Magnetanker.Based on the illustrated prior art, the invention has the object, a magnetic assembly of a solenoid valve with a residual air gap according to the preamble of claim 1 such that a comparison with the prior art simplified handling with relatively simple and cost manufacturability of the residual air gap disc is made possible.
This object is achieved in a magnetic assembly with a residual air gap disc with the features of claim 1, characterized in that the residual air gap disc is at least substantially rigid and consists of a consisting of ferromagnetic material body, which is connected to a non-magnetic element. In other words, this means that instead of a according to the prior art from a thin residual air gap to achieve the smallest possible residual air gap, the residual air gap disc according to the invention has a significantly greater thickness to allow the desired rigidity of the residual air gap disc. In order to be able to set the smallest possible residual air gap despite the relatively large thickness of the residual air gap disc, the residual air gap disk next to the non-magnetic element, instead of a In addition, consisting of a non-magnetic material, foil-like residual air gap disc, in addition, consisting of a ferromagnetic material base member which serves to allow the required stiffness of the residual air gap disc. "Substantially rigid" is understood according to the invention to mean that the residual air gap disk has such a rigidity that it can be elastically deformed either only with relatively great force and is otherwise plastically deformable.
Such a design of a residual air gap disc according to the invention makes it possible on the one hand, due to the great rigidity or thickness of the residual air gap disc, to incorporate these into the manufacturing process of the magnet assembly in a particularly simple manner and, in particular, to enable relatively simple handling. Furthermore, the high rigidity furthermore achieves the advantage that, for example, a frictional connection between the residual air gap disk and a magnetic armature or a magnetic core can be produced particularly easily.
Advantageous developments of the magnetic assembly according to the invention of a solenoid valve with a residual air gap disc are listed in the subclaims. According to the invention it is provided that the non-magnetic element is formed as a cladding. The advantage of plating is in particular that a relatively simple adjustment of the thickness of the non-magnetic element is made possible, and that a connection between the base body and the non-magnetic element is made possible in an economically advantageous manner without additional connecting means. According to the invention, the geometric dimensions of the residual air gap disk provide that the thickness of the main body is between 0.15 mm and 1.75 mm, the thickness of the non-magnetic element between 5 μm and 75 μm. Such a dimensioning of the base body and the non-magnetic element allows for a formation of the required stiffness of the residual air gap disc and beyond the desired thin or small residual air gap between the magnetic core and the armature.

Wichtig ist es, dass die Restluftspaltscheibe innerhalb der Magnetbaugruppe eine definierte Position einnimmt, die sich während des Betriebs nicht ändert. Durch die hohe Steifigkeit der Restluftspaltscheibe wird eine hohe Vielfalt an möglichen Verbindungstechniken mit dem Magnetanker oder dem Magnetkern ermöglicht. So ist es in einer ersten Ausgestaltung denkbar, dass die Restluftspaltscheibe dazu ausgebildet ist, mit dem Magnetkern durch eine kraft- und/oder formschlüssige Verbindung verbunden zu werden. Alternativ ist es jedoch auch möglich, dass die Restluftspaltscheibe dazu ausgebildet ist, mit dem Magnetkern durch eine kraft- und/oder formschlüssige Verbindung verbunden zu werden.It is important that the residual air gap disc within the magnet assembly occupies a defined position that does not change during operation. Due to the high rigidity of the residual air gap disc, a large variety of possible connection techniques with the armature or the magnetic core is made possible. Thus, it is conceivable in a first embodiment that the residual air gap disc is adapted to be connected to the magnetic core by a non-positive and / or positive connection. Alternatively, however, it is also possible that the residual air gap disc is designed to be connected to the magnetic core by a non-positive and / or positive connection.

Eine weitere Beeinflussung von Funktionseigenschaften der Magnetbaugruppe besteht darin, wenn die Restluftspaltscheibe auf der dem Magnetkern oder dem Magnetanker zugewandten Seite eine unebene Oberflächenform aufweist. Eine derartige unebene Oberflächenform kann beispielsweise zur Dämpfung der Bewegung des Magnetankers verwendet werden und lässt sich besonders einfach beispielsweise durch einen Prägeprozess der Restluftspaltscheibe erzielen.Another influencing of functional properties of the magnet assembly is when the residual air gap disk has an uneven surface shape on the side facing the magnet core or the magnet armature. Such an uneven surface shape can be used, for example, for damping the movement of the magnet armature and can be particularly easily achieved, for example, by an embossing process of the residual air gap disk.

Die Erfindung umfasst auch ein Verfahren zum Herstellen einer Restluftspaltscheibe für eine erfindungsgemäße Magnetbaugruppe. Hierbei ist es erfindungsgemäß vorgesehen, dass auf einem aus ferromagnetischem Material bestehenden, als endloses Band ausgebildeten Grundkörper durch Plattieren ein nichtmagnetisches, ebenfalls als endloses Band ausgebildetes Element aufgebracht wird, und dass anschließend die Restluftspaltscheibe durch Ausstanzen aus dem durch die beiden Bänder ausgebildeten Rohband erzeugt wird. Ein derartiges erfindungsgemäßes Verfahren ermöglicht eine besonders einfache und kostengünstige Herstellung von erfindungsgemäßen Restluftspaltscheiben.The invention also includes a method for producing a residual air gap disk for a magnet assembly according to the invention. In this case, it is provided according to the invention that a non-magnetic, also formed as an endless belt element is applied to an existing ferromagnetic material formed as an endless belt body by plating, and then that the residual air gap disc is produced by punching out of the formed by the two bands raw tape , Such a method according to the invention enables a particularly simple and cost-effective production of residual air gap disks according to the invention.

Dabei wird nach oder beim Ausstanzen der Restluftspaltscheibe die Restluftspaltscheibe zumindest bereichsweise verformt. Eine derartige Verformung dient, wie oben angeführt, insbesondere zum Ausbilden einer unebenen Oberflächenform der Restluftspaltscheibe zur Beeinflussung von Funktionseigenschaften der Magnetbaugruppe.In this case, after or during punching of the residual air gap disk, the residual air gap disk is deformed at least in regions. Such deformation serves, as stated above, in particular for forming an uneven surface shape of the residual air gap disk for influencing functional properties of the magnet assembly.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung. Diese zeigt in:

Fig. 1
einen Ausschnitt aus einem Kraftstoffinjektor im Bereich einer erfindungsgemäßen Magnetbaugruppe unter Verwendung einer Restluftspaltscheibe in einem Längsschnitt,
Fig. 2
ein Detail der Fig. 1 in vergrößerter Darstellung, ebenfalls im Längsschnitt,
Fig. 3
eine Darstellung einer an einem Magnetanker befestigten Restluftspaltscheibe im Längsschnitt,
Fig. 4
eine Draufsicht auf eine Restluftspaltscheibe und
Fig. 5
eine vereinfachte perspektivische Darstellung einer Einrichtung zum Verbinden eines Grundelements der Restluftspaltscheibe mit einem nichtmagnetischen Element.
Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. This shows in:
Fig. 1
a detail of a fuel injector in the region of a magnetic assembly according to the invention using a residual air gap disk in a longitudinal section,
Fig. 2
a detail of Fig. 1 in an enlarged view, also in longitudinal section,
Fig. 3
a representation of a fixed to a magnet armature residual air gap disk in longitudinal section,
Fig. 4
a plan view of a residual air gap disc and
Fig. 5
a simplified perspective view of a device for connecting a basic element of the residual air gap disc with a non-magnetic element.

Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen.The same elements or elements with the same function are provided in the figures with the same reference numerals.

In der Fig. 1 ist eine Magnetbaugruppe 100 eines Magnetventils dargestellt, das Bestandteil eines Kraftstoffinjektors 1 zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine, insbesondere in den Brennraum einer selbstzündenden Brennkraftmaschine ist. Die Magnetbaugruppe 100 ist innerhalb eines Gehäuses 11, insbesondere dem Injektorgehäuse, angeordnet, und umfasst zumindest einen im Ausführungsbeispiel scheibenförmig ausgebildeten Magnetkern 12, in dem in einer ringförmigen umlaufenden Vertiefung eine Magnetspule 13 eingesetzt ist. Der Magnetkern 12 bzw. die Magnetspule 13 wirken mit einem ebenfalls im Wesentlichen scheibenförmig ausgebildeten Magnetanker 15 zusammen, der auf der dem Magnetkern 12 abgewandten Seite in einen stiftförmigen Abschnitt 16 übergeht, der als Ventilglied in Form einer Düsennadel ausgebildet ist oder zumindest mittelbar mit einem Ventilglied (Düsennadel) wirkverbunden angeordnet ist, um die Düsennadel zum Freigeben von nicht dargestellten Einspritzöffnungen in dem Gehäuse 11 freizugeben bzw. zu verschließen.In the Fig. 1 a solenoid assembly 100 of a solenoid valve is shown, which is part of a fuel injector 1 for injecting fuel into the combustion chamber of an internal combustion engine, in particular in the combustion chamber of a self-igniting internal combustion engine. The magnet assembly 100 is arranged within a housing 11, in particular the injector housing, and comprises at least one magnetic core 12 in the form of a disc in the exemplary embodiment, in which a magnetic coil 13 is inserted in an annular circumferential depression. The magnetic core 12 and the magnetic coil 13 cooperate with a likewise substantially disk-shaped magnet armature 15, which merges on the side facing away from the magnetic core 12 in a pin-shaped portion 16 which as Valve member is formed in the form of a nozzle needle or at least indirectly operatively connected to a valve member (nozzle needle) is arranged to release the nozzle needle for releasing injection openings, not shown in the housing 11 and to close.

Der Magnetkern 12 weist eine mittig angeordnete Durchgangsbohrung 17 auf, die von einer Druckfeder 18 durchsetzt ist, deren eine Ende an der Stirnseite des Magnetankers 15 anliegt und diesen in Richtung von dem Magnetkern 12 wegdrückt, um die (nicht dargestellten) Einspritzöffnungen durch das Ventilglied zu verschließen. Bei einer Bestromung der Magnetspule 13 wird der Magnetanker 15 entgegen der Federkraft der Druckfeder 18 in Richtung zum Magnetkern 12 gezogen. Um insbesondere bei einer anschließenden, zum Schließen der Einspritzöffnungen erforderlichen Rückbewegung des Magnetankers 15 bei unbestromter Magnetspule 13 ein magnetisches Anhaften des Magnetankers 15 an dem Magnetkern 12 zu vermeiden, ist zwischen der dem Magnetanker 15 zugewandten Stirnseite des Magnetkerns 12 und dem Magnetanker 15 eine erfindungsgemäße Restluftspaltscheibe 10 angeordnet.The magnetic core 12 has a centrally disposed through hole 17 which is penetrated by a compression spring 18, whose one end abuts against the end face of the armature 15 and this pushes away in the direction of the magnetic core 12 to the (not shown) injection openings through the valve member close. When the magnet coil 13 is energized, the armature 15 is pulled against the spring force of the compression spring 18 in the direction of the magnet core 12. In order to avoid a magnetic adhesion of the armature 15 to the magnetic core 12, in particular in a subsequent, required to close the injection openings return movement of the magnet armature 15 in the energized magnetic coil 13, between the armature 15 facing the front side of the magnetic core 12 and the armature 15, a residual air gap disc according to the invention 10 arranged.

Die im Wesentlichen ring- bzw. scheibenförmig ausgebildete Restluftspaltscheibe 10 besteht, wie insbesondere anhand der Fig. 2 ersichtlich ist, aus einem aus - ferromagnetischem Material bestehenden Grundkörper 21 und einem mit dem Grundkörper 21 verbundenen, aus nichtmagnetischem Material bestehenden Element 22. Vorzugsweise ist das Element 22 auf der dem Magnetanker 15 zugewandten Seite angeordnet. Der Grundkörper 21, der beispielsweise eine Dicke zwischen 0,15mm und 1,75mm aufweist, besteht beispielsweise aus Blech bzw. Stahl und sorgt für die erfindungsgemäß gewünschte Steifigkeit der Restluftspaltscheibe 10. Demgegenüber sorgt das nichtmagnetische Element 22, das in Form einer Plattierung 23 ausgebildet und mit dem Grundkörper 21 verbunden ist, für die magnetische Trennung zwischen dem Magnetanker 15 und dem Magnetkern 12. Das nichtmagnetische Element 22 besteht beispielsweise aus einem Edelstahlmaterial o.ä. und weist eine Dicke zwischen 5µm und 75µm auf.The substantially ring-shaped or disc-shaped residual air gap disc 10, as in particular with reference to the Fig. 2 It can be seen from a basic body 21 made of ferromagnetic material and a non - magnetic material element 22 connected to the main body 21. Preferably, the element 22 is arranged on the side facing the magnet armature 15. The main body 21, which has, for example, a thickness between 0.15 mm and 1.75 mm, consists for example of sheet metal or steel and provides the inventively desired stiffness of the residual air gap disc 10. In contrast, the non-magnetic element 22, which is in the form of a cladding 23 provides and is connected to the main body 21, for the magnetic separation between the armature 15 and the magnetic core 12. The non-magnetic element 22 is made of, for example, a stainless steel material or the like. and has a thickness between 5μm and 75μm.

Wie darüber hinaus anhand der Darstellung der Fig. 4 erkennbar ist, kann die Restluftspaltscheibe 10 beispielsweise auf einem Teilkreisdurchmesser angeordnete, kleine Aussparungen 24 oder einen Schlitz 25, mehrere dünne Schlitze o.ä. aufweisen.In addition, based on the presentation of the Fig. 4 can be seen, the residual air gap disc 10, for example, on a pitch circle diameter arranged, small recesses 24 or a slot 25, several thin slits o.ä. exhibit.

Bei dem in den Fig. 1 und 2 dargestellten Ausführungsbeispiel der Restluftspaltscheibe 10 ist diese mit dem Magnetkern 12 fest verbunden. Im dargestellten Ausführungsbeispiel weist die Restluftspaltscheibe 10 hierzu beispielhaft, und nicht einschränkend, einen sich in Längsrichtung erstreckenden, radial umlaufenden Rand 26 auf, der in eine, an dem Magnetkern 12 ausgebildete, ebenfalls radial umlaufende Vertiefung 27 in Form einer Nut eingreift, beispielsweise hervorgerufen durch ein Bördelwerkzeug o.ä.In the in the Fig. 1 and 2 illustrated embodiment of the residual air gap disc 10, this is firmly connected to the magnetic core 12. In the illustrated embodiment, the residual air gap disc 10 for this purpose by way of example, and not limiting, extending in the longitudinal direction, radially encircling edge 26 which engages in a formed on the magnetic core 12, also radially circumferential recess 27 in the form of a groove, for example, caused by a crimping tool or similar

Ergänzend wird erwähnt, dass anstelle eines (vollständig) radial umlaufenden Randes 26 es auch vorgesehen sein kann, dass der Rand 26 lediglich in Form von Stegen o.ä. ausgebildet ist, wobei die Stege vorzugsweise in gleichmäßigen Winkelabständen zueinander angeordnet sind. Ferner kann die Befestigung der Restluftspaltescheibe 10 zusätzlich oder alternativ am Innenumfang des Magnetkerns 12 erfolgen.In addition, it is mentioned that instead of a (completely) radially encircling edge 26, it may also be provided that the edge 26 is merely in the form of webs or the like. is formed, wherein the webs are preferably arranged at equal angular intervals to each other. Furthermore, the attachment of the residual air gap disk 10 can additionally or alternatively take place on the inner circumference of the magnetic core 12.

Die Verbindung zwischen der Restluftspaltscheibe 10 und dem Magnetkern 12 ist somit als kraft- und/oder formschlüssige Verbindung ausgebildet.The connection between the residual air gap disk 10 and the magnetic core 12 is thus designed as a non-positive and / or positive connection.

In der Fig. 3 ist eine Restluftspaltscheibe 10a dargestellt, bei der die Restluftspaltscheibe 10a mit dem Magnetanker 15a verbunden ist. Die Verbindung zwischen der Restluftspaltscheibe 10a und dem Magnetanker 15a erfolgt in analoger Weise zur Verbindung zwischen der Restluftspaltscheibe 10 und dem Magnetkern 12 bei der Fig. 2 durch einen radial umlaufenden Rand 28 der Restluftspaltscheibe 10a, der bereichsweise radial nach innen in eine Vertiefung 29 des Magnetankers 15a hineinragt. Auch bei dem in der Fig. 3 dargestellten Ausführungsbeispiel erfolgt somit eine kraft- und/oder formschlüssige Verbindung zwischen der Restluftspaltscheibe 10a und dem Magnetanker 15a. Bei der Restluftspaltscheibe 10a ist das Element 22 auf der dem Magnetanker 15a abgewandten Seite angeordnet.In the Fig. 3 a residual air gap disk 10a is shown, in which the residual air gap disk 10a is connected to the magnet armature 15a. The connection between the residual air gap disk 10a and the magnet armature 15a takes place analogously to the connection between the residual air gap disk 10 and the magnetic core 12 in the case of Fig. 2 by a radially encircling edge 28 of the residual air gap disc 10a, which projects in regions radially inwardly into a recess 29 of the magnet armature 15a. Also in the in the Fig. 3 illustrated embodiment thus takes place a positive and / or positive connection between the residual air gap disc 10a and the armature 15a. In the residual air gap disk 10a, the element 22 is arranged on the side facing away from the magnet armature 15a.

In der Fig. 5 ist ein Teil einer Fertigungseinrichtung 50 zum Herstellen von Restluftspaltscheiben 10, 10a für eine erfindungsgemäße Magnetbaugruppe dargestellt. Insbesondere umfasst die Fertigungseinrichtung 50 zwei parallel zueinander angeordnete und zusammenwirkende Presswalzen 51, 52. Den beiden Presswalzen 51, 52 werden einander überdeckende, in Form von endlosen Bändern 53, 54 bevorratete Abschnitte des Grundkörpers 21 sowie des nichtmagnetischen Elements 22 zugeführt, wobei durch eine entsprechend ausgebildete Anordnung der beiden Presswalzen 51, 52 mit einem geringen Spalt zwischen den beiden Presswalzen 51, 52 das nichtmagnetische Element 22 auf den ferromagnetischen Grundkörper 21 aufgewalzt wird, wobei dieser Vorgang als Plattierung bezeichnet wird. Hierbei findet eine innige Verbindung des Materials des Grundkörpers 21 mit dem Material des nichtmagnetischen Elements 22 statt. Nach Durchlaufen der beiden Presswalzen 51, 52 werden aus dem (einstückigen) Rohband 55 durch einen Stanzvorgang die Restluftspaltscheiben 10, 10a ausgestanzt. Darüber hinaus kann es vorgesehen sein, dass die Restluftspaltscheiben 10, 10a, entweder bereits während des Stanzprozesses, oder durch ein nachgeordnetes Werkzeug mit einer unebenen Oberfläche versehen werden, um Funktionseigenschaften der Magnetbaugruppe 10, beispielsweise Dämpfungseigenschaften, zu beeinflussen.In the Fig. 5 FIG. 2 shows a part of a production device 50 for producing residual air gap disks 10, 10a for a magnet assembly according to the invention. In particular, the manufacturing device 50 comprises two parallel The two press rolls 51, 52 are supplied to each other covering sections of the main body 21 and of the nonmagnetic element 22 which are stored in the form of endless belts 53, 54, wherein a corresponding arrangement of the two press rolls 51, 52 with a small gap between the two press rollers 51, 52, the non-magnetic element 22 is rolled onto the ferromagnetic base body 21, this process being referred to as plating. In this case, an intimate connection of the material of the main body 21 with the material of the non-magnetic element 22 takes place. After passing through the two press rolls 51, 52, the residual air gap disks 10, 10a are punched out of the (one-piece) raw strip 55 by a stamping process. In addition, provision may be made for the residual air gap disks 10, 10a, either already during the stamping process or by a downstream tool, to be provided with an uneven surface in order to influence the functional properties of the magnet assembly 10, for example damping properties.

Claims (8)

  1. Magnet assembly (100) of a magnetic valve, in particular in a fuel injector (1), with a residual air gap between a face side of a magnet core (12) and an armature (15; 15a) which at least indirectly actuates a valve element (16) being set by means of a residual air gap disc (10; 10a; 10b; 10c), wherein the residual air gap disc (10; 10a; 10b; 10c) is of at least substantially rigid form and has a main body (21) which is composed of a ferromagnetic material and which is connected to a non-magnetic element (22),
    characterized
    in that the non-magnetic element (22) is formed as a plating (23), and the thickness of the main body (21) is 0.15 mm to 1.75 mm and the thickness of the non-magnetic element (22) is 5 µm to 75 µm.
  2. Magnet assembly (100) according to Claim 1,
    characterized
    in that the residual air gap disc (10a; 10b; 10c) is designed to be connected to the magnet core (12) by means of a non-positively locking and/or positively locking connection.
  3. Magnet assembly (100) according to Claim 1,
    characterized
    in that the residual air gap disc (10a) is designed to be connected to the magnet armature (15a) by means of a non-positively locking and/or positively locking connection.
  4. Magnet assembly (100) according to one of Claims 1 to 3,
    characterized
    in that the residual air gap disc (10; 10a; 10b; 10c) has an uneven surface form on the side facing toward the magnet core (12) or toward the magnet armature (15; 15a).
  5. Magnet assembly (100) according to one of Claims 1 to 4,
    characterized
    in that the residual air gap disc (10b; 10c) has at least one section (34) which extends at least substantially concentrically with respect to a longitudinal axis (33), and two sections (31, 32) which extend radially in relation to the longitudinal axis (33).
  6. Magnet assembly (100) according to one of Claims 1 to 5,
    characterized
    in that the residual air gap disc (10; 10a; 10b; 10c) has at least one recess or one slot (36 to 38).
  7. Magnet assembly (100) according to Claim 6,
    characterized
    in that the residual air gap disc (10c) is of ring-shaped or sleeve-shaped form and has a slot (38) which extends in a radial direction and which is formed as a slot (38) extending all the way through and which divides the residual air gap disc (10c) in the circumferential direction.
  8. Method for producing a residual air gap disc for a magnet assembly (100) according to one of Claims 1 to 7,
    characterized
    in that, on a main body (21) which is composed of ferromagnetic material and which is formed as an endless strip (53), a non-magnetic element (22) which is likewise formed as an endless strip (54) is applied by plating, and in that, subsequently, the residual air gap disc (10; 10a) is generated by punching out from the unprocessed strip (55; 55a) composed of the two strips (53, 54), wherein the residual air gap disc (10; 10a; 10b; 10c) is at least regionally deformed after or during the punching-out process.
EP15152803.1A 2014-02-10 2015-01-28 Residual air dividing disc for a magnetic assembly of a solenoid valve and method for producing a residual air dividing disc Not-in-force EP2905460B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014202333 2014-02-10
DE102014215589.4A DE102014215589A1 (en) 2014-02-10 2014-08-06 Residual air gap disk for a magnetic assembly of a solenoid valve and method for producing a residual air gap disk

Publications (2)

Publication Number Publication Date
EP2905460A1 EP2905460A1 (en) 2015-08-12
EP2905460B1 true EP2905460B1 (en) 2018-03-14

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EP15152803.1A Not-in-force EP2905460B1 (en) 2014-02-10 2015-01-28 Residual air dividing disc for a magnetic assembly of a solenoid valve and method for producing a residual air dividing disc

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Publication number Priority date Publication date Assignee Title
DE102015223167A1 (en) * 2015-11-24 2017-05-24 Robert Bosch Gmbh Switching valve for a fuel injector and fuel injector
DE102016203516A1 (en) * 2016-03-03 2017-09-07 Robert Bosch Gmbh Electromagnetically actuated inlet valve and high-pressure pump with inlet valve
DE102016206180A1 (en) * 2016-04-13 2017-10-19 Robert Bosch Gmbh Valve, in particular suction valve, in a high-pressure pump of a fuel injection system
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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US2273073A (en) * 1940-02-28 1942-02-17 Empire Electric Brake Corp Electromagnet
DE3501973A1 (en) * 1984-01-23 1985-07-25 Nippondenso Co., Ltd., Kariya, Aichi Fuel injection nozzle
JPS60153468A (en) * 1984-01-23 1985-08-12 Nippon Denso Co Ltd Electromagnetic fuel injection valve
JPH1177336A (en) * 1997-09-12 1999-03-23 Kawai Musical Instr Mfg Co Ltd Production of inlaid type clad material
JP2003156169A (en) * 2001-09-04 2003-05-30 Denso Corp Electromagnetic fluid control device
DE202005006296U1 (en) * 2005-04-20 2005-07-07 Bürkert Werke GmbH & Co. KG Electromagnetic unit e.g. for solenoid valve, has floor of magnet housing comprised of multilayered transformer laminations
DE102008001891A1 (en) 2008-05-21 2009-11-26 Robert Bosch Gmbh Residual air gap disc
DE102009001706A1 (en) 2009-03-20 2010-09-23 Robert Bosch Gmbh Residual air gap disc
DE102009003213A1 (en) 2009-05-19 2010-11-25 Robert Bosch Gmbh Residual air gap disc
DE102011089935A1 (en) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Magnetic component for magnetic valve for operating fuel injectors, has residual air gap disk positively connected with armature or magnetic core by using plugging connection such that air gap disk is positionally fixed
DE102012210956A1 (en) * 2012-06-27 2014-01-02 Robert Bosch Gmbh Method for producing a housing, in particular a valve housing

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EP2905460A1 (en) 2015-08-12

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