EP3469207B1 - Residual air gap disk for a solenoid valve and fuel injector having a residual air gap disk - Google Patents

Residual air gap disk for a solenoid valve and fuel injector having a residual air gap disk Download PDF

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Publication number
EP3469207B1
EP3469207B1 EP17725915.7A EP17725915A EP3469207B1 EP 3469207 B1 EP3469207 B1 EP 3469207B1 EP 17725915 A EP17725915 A EP 17725915A EP 3469207 B1 EP3469207 B1 EP 3469207B1
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EP
European Patent Office
Prior art keywords
air gap
residual air
gap disc
structuring
electromagnet
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EP17725915.7A
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German (de)
French (fr)
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EP3469207A1 (en
Inventor
Thomas Nierychlo
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating 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
    • 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
    • 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
    • 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 residual air gap disk for a solenoid valve according to the preamble of claim 1. Furthermore, the invention relates to a fuel injector using a residual air gap disk according to the invention.
  • a residual air gap disc according to the preamble of claim 1 is from DE 10 2009 003 213 A1 known to the applicant.
  • the known residual air gap disk made of metal is characterized by tongues which are formed on the outer circumference and project radially outward and which enable axial clamping or positioning of the residual air gap disk in the area of a clamping point of a magnet sleeve.
  • the manufacture of such a residual air disc and its assembly in a solenoid valve are relatively complex.
  • the geometry of the magnet sleeve must be adapted with a view to the jamming of the remaining air gap disc.
  • a residual air gap disk for a solenoid valve with the features of claim 1 has the advantage that there is less or no hydraulic adhesion or sticking between the armature and the residual air gap disk without the damping behavior during the opening process of the armature, which is usually part of a valve seat Control of a liquid flow is, is significantly impaired, and without a mechanical frictional connection between the residual air gap disc and a component of the solenoid valve is required. Furthermore, the adhesive or adhesive behavior between the electromagnet or its magnetic core and the residual air gap disc is maintained, so that it is ensured that the residual air gap disc always adheres to the electromagnet or the magnetic core. This leads to the avoidance of the above Jumps in closing duration during operation of a fuel injector equipped with a solenoid valve.
  • the invention is based on the idea of preventing the residual air gap disk from hydraulically sticking or sticking to the magnet armature by structuring the end face of the residual air gap disk facing the magnet armature.
  • a structuring brings about, in particular, a reduction in the contact area between the remaining air gap disc and the magnet armature or an enlargement of a hydraulic gap in the area of recesses in the structuring and the magnet armature. This reduces the hydraulic adhesion effect between the residual air gap disc and the magnet armature on the end faces facing one another.
  • the end face of the remaining air gap disc having the structure is flat outside the structuring or has at least one burr.
  • the burr can arise in particular through a manufacturing process of the residual air gap disk when it is punched out of a sheet metal coil.
  • the fact that the burr is arranged on the end face of the residual air gap disc facing away from the electromagnet also ensures that the end face of the residual air gap disc facing the electromagnet, which is usually flat due to the manufacturing process, adheres particularly well (hydraulically) to the electromagnet.
  • the entire end face of the remaining air gap disc facing the magnet armature does not have to be provided with the structuring; rather, it is sufficient or has proven to be advantageous if the area of the structuring is between 20% and 60%, preferably between 25% and 50% of the face on the remaining air gap disc.
  • the structuring it is not necessary for the structuring to have particularly great depths or elevations, which may be relatively difficult to implement with corresponding manufacturing processes. Rather, it is sufficient if the structural elements of the structuring, based on the surface of the remaining air gap disc, have depths between 1 ⁇ m and 5 ⁇ m.
  • the fluid located between the residual air gap disc and the magnet armature can flow radially inwards and outwards in order to avoid hydraulic adhesion. Therefore it is according to the invention provided that the structuring comprises radially extending grooves which extend from an inner circumferential surface to an outer circumferential surface of the residual air gap disc.
  • the structuring described so far with structure elements with a depth between 1 ⁇ m and 5 ⁇ m can be produced in a first preferred embodiment by an etching process, with the aid of which structure depths of up to 5 ⁇ m can be produced.
  • the embodiment of the residual air gap disk according to the invention provides that it is designed to be corrugated in cross section on its outer circumferential surface in the circumferential direction. This has the advantage that fuel can flow out in the direction of the low-pressure area via longitudinal grooves formed in the area of the magnet core when the indentations on the circumferential surface are in overlap with the longitudinal slots.
  • the invention also comprises a fuel injector with a solenoid valve with a residual air gap disk according to the invention. This has the advantages mentioned at the beginning of avoiding jumps in the closing duration during operation of the fuel injector.
  • a solenoid valve 10 is shown as part of a fuel injector 100 with its essential components.
  • the fuel injector 100 is, in particular, a fuel injector 100 of the kind used as part of a so-called common rail injection system for injecting fuel into the combustion chamber of a compression-ignition internal combustion engine.
  • the solenoid valve 10 has a housing 11 in which a magnetic core 12 is arranged.
  • a magnet coil 14 is arranged as part of an electromagnet 15.
  • the annular magnetic core 12 has a longitudinal bore in the form of a through bore 16 in which an anchor bolt 17 is arranged.
  • a compression spring 20 is supported on a collar 18 of the armature bolt 17 and acts on the armature bolt 17 in a direction away from the magnet core 14 or the electromagnet 15.
  • a magnet armature 25 is arranged on the armature bolt 17.
  • the magnet armature 25 On the side facing the magnet core 14, the magnet armature 25 has a flat end face 26 which, when the electromagnet 15 is energized, rests against a residual air gap disk 30 in some areas.
  • a residual air gap 32 is formed between the end face 26 and the opposite end face 31 of the magnet core 14.
  • the annular residual air gap disk 30 has an inner peripheral surface 33 and an outer peripheral surface 34. How best with the Figs. 2 and 3 can be seen, the outer circumferential surface 34 is in plan view in the circumferential direction formed corrugated, while the inner peripheral surface 33 is formed circular.
  • the residual air gap disk 30 consists in particular of steel and is produced in the punching process from a sheet metal strip or coil by punching out. Based on Fig. 3 It can be seen that the end face 35 of the residual air gap disk 30 facing the magnet core 12 is flat or smooth, the roughness or flatness of the end face 35 being determined solely by the primary forming process of the residual air gap disk 30 or possibly provided processing steps. In contrast, the Fig. 2 the end face 36 of the residual air gap disk 30 facing the magnet armature 25 has a structure 38.
  • the structuring 38 comprises a plurality of grooves 39 running radially between the inner circumferential surface 33 and the outer circumferential surface 34 as structural elements.
  • the grooves 39 are formed, for example, by an etching process or by laser beam treatment, and have a depth of between 1 ⁇ m and 5 ⁇ m compared to the areas 40 in which no structuring 38 is provided, depending on the manufacturing process for forming the structuring 38.
  • the area of the structuring 38 is between 20% and 60%, preferably between 25% and 50% of the area of the end face 36.
  • the individual grooves 39 are preferably arranged at equal angular distances from the longitudinal axis of the remaining air gap disk 30. Possibly.
  • the residual air gap disk 30 described so far can be modified or modified in many ways without deviating from the inventive concept.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Restluftspaltscheibe für ein Magnetventil nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung einen Kraftstoffinjektor unter Verwendung einer erfindungsgemäßen Restluftspaltscheibe.The invention relates to a residual air gap disk for a solenoid valve according to the preamble of claim 1. Furthermore, the invention relates to a fuel injector using a residual air gap disk according to the invention.

Eine Restluftspaltscheibe nach dem Oberbegriff des Anspruchs 1 ist aus der DE 10 2009 003 213 A1 der Anmelderin bekannt. Die bekannte, aus Metall bestehende Restluftspaltscheibe zeichnet sich durch am Außenumfang ausgebildete, radial nach außen ragende Zungen aus, die ein axiales Verklemmen bzw. Positionieren der Restluftspaltscheibe im Bereich einer Einklemmstelle einer Magnethülse ermöglichen. Die Fertigung einer derartigen Restluftscheibe und deren Montage in einem Magnetventil sind relativ aufwendig. Weiterhin muss die Geometrie der Magnethülse mit Blick auf die Einklemmung der Restluftspaltscheibe angepasst werden.A residual air gap disc according to the preamble of claim 1 is from DE 10 2009 003 213 A1 known to the applicant. The known residual air gap disk made of metal is characterized by tongues which are formed on the outer circumference and project radially outward and which enable axial clamping or positioning of the residual air gap disk in the area of a clamping point of a magnet sleeve. The manufacture of such a residual air disc and its assembly in a solenoid valve are relatively complex. Furthermore, the geometry of the magnet sleeve must be adapted with a view to the jamming of the remaining air gap disc.

Weiterhin ist es aus der DE 10 2013 2012 238 A1 der Anmelderin eine weitere Restluftspaltscheibe bekannt, die aus einem keramischen Material besteht, das sehr hitzebeständig ist und sich plastisch nicht verformt. Dadurch ist eine besonders hohe Zuverlässigkeit der Funktion über die gesamte Lebensdauer eines mit einer derartigen Restluftspaltscheibe ausgestatteten Magnetventils sichergestellt. Weitere Restluftspaltscheiben offenbaren die US5372313 A und die DE102011 086284 A1 .Furthermore, it is from the DE 10 2013 2012 238 A1 The applicant knows another residual air gap disc which consists of a ceramic material which is very heat-resistant and does not deform plastically. This ensures particularly high reliability of the function over the entire service life of a solenoid valve equipped with such a residual air gap disk. Further residual air gap disks reveal the US5372313 A and the DE102011 086284 A1 .

Bei Restluftspaltscheiben, die in dem Axialspalt zwischen dem Magnetanker und dem Magnetkern des Elektromagneten angeordnet sind, soll ein magnetisches Kleben bzw. Anhaften des Magnetankers an der Restluftspaltscheibe in einer Stellung, bei der der Elektromagnet den Magnetanker anzieht, verhindert bzw. vermieden werden. Bei den Restluftspaltscheiben, die im Gegensatz zu der eingangs genannten Restluftspaltscheibe nicht durch Kraftschluss axial fixiert sind, kann jedoch ein hydraulisches Kleben bzw. Anhaften stattfinden, was je nach Schiefstand zwischen dem Elektromagneten und der dem Magnetanker zugewandten Stirnseite der Restluftspaltscheibe dazu führt, dass die Restluftspaltscheibe entweder am Magnetkern des Elektromagneten, oder aber im Bereich des Magnetankers an diesem anhaftet. Aus diesem undefinierten Haftverhalten der Restluftspaltscheibe resultieren während des Betriebs des Magnetventils bei Einbau in einem Kraftstoffinjektor unterschiedliche Schließdauern einer Düsennadel, sogenannte Schließdauersprünge.In the case of residual air gap disks which are arranged in the axial gap between the magnet armature and the magnet core of the electromagnet, magnetic sticking or sticking of the magnet armature to the residual air gap disk in a position in which the electromagnet attracts the magnet armature should be prevented or avoided. In the case of the residual air gap discs, which, in contrast to the residual air gap disc mentioned at the beginning, are not axially fixed by a force fit However, hydraulic sticking or sticking can take place, which, depending on the inclination between the electromagnet and the end face of the residual air gap disc facing the magnet armature, leads to the residual air gap disk sticking either to the magnet core of the electromagnet or to the magnet armature in the area of the magnet armature. This undefined adhesive behavior of the residual air gap disc results in different closing times of a nozzle needle during operation of the solenoid valve when it is installed in a fuel injector, so-called closing time jumps.

Offenbarung der ErfindungDisclosure of the invention

Eine Restluftspaltscheibe für ein Magnetventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass ein geringeres bzw. kein hydraulisches Anhaften bzw. Kleben zwischen dem Magnetanker und der Restluftspaltscheibe auftritt, ohne dass das Dämpfungsverhalten während des Öffnungsvorgangs des Magnetankers, der üblicherweise Bestandteil eines Ventilsitzes zur Steuerung eines Flüssigkeitsstroms ist, signifikant verschlechtert wird, und ohne dass ein mechanischer Kraftschluss zwischen der Restluftspaltscheibe und einem Bauteil des Magnetventils erforderlich ist. Weiterhin wird das Klebe- bzw. Anhaftverhalten zwischen dem Elektromagneten bzw. dessen Magnetkern und der Restluftspaltscheibe beibehalten, damit sichergestellt ist, dass die Restluftspaltscheibe stets am Elektromagneten bzw. dem Magnetkern anhaftet. Dies führt zu einer Vermeidung der o.g. Schließdauersprünge während des Betriebs eines mit einem Magnetventil ausgestatteten Kraftstoffinjektors.A residual air gap disk for a solenoid valve with the features of claim 1 has the advantage that there is less or no hydraulic adhesion or sticking between the armature and the residual air gap disk without the damping behavior during the opening process of the armature, which is usually part of a valve seat Control of a liquid flow is, is significantly impaired, and without a mechanical frictional connection between the residual air gap disc and a component of the solenoid valve is required. Furthermore, the adhesive or adhesive behavior between the electromagnet or its magnetic core and the residual air gap disc is maintained, so that it is ensured that the residual air gap disc always adheres to the electromagnet or the magnetic core. This leads to the avoidance of the above Jumps in closing duration during operation of a fuel injector equipped with a solenoid valve.

Der Erfindung liegt die Idee zugrunde, durch eine Strukturierung der dem Magnetanker zugewandten Stirnseite der Restluftspaltscheibe ein hydraulisches Anhaften bzw. Kleben der Restluftspaltscheibe an dem Magnetanker zu verhindern. Eine derartige Strukturierung bewirkt insbesondere eine Verringerung der Kontaktfläche zwischen der Restluftspaltscheibe und dem Magnetanker bzw. zu einer Vergrößerung eines hydraulischen Spalts im Bereich von Vertiefungen der Strukturierung und dem Magnetanker. Dadurch wird die hydraulische Adhäsionswirkung zwischen der Restluftspaltscheibe und dem Magnetanker an den einander zugewandten Stirnseiten vermindert.The invention is based on the idea of preventing the residual air gap disk from hydraulically sticking or sticking to the magnet armature by structuring the end face of the residual air gap disk facing the magnet armature. Such a structuring brings about, in particular, a reduction in the contact area between the remaining air gap disc and the magnet armature or an enlargement of a hydraulic gap in the area of recesses in the structuring and the magnet armature. This reduces the hydraulic adhesion effect between the residual air gap disc and the magnet armature on the end faces facing one another.

Vorteilhafte Weiterbildungen der erfindungsgemäßen Restluftspaltscheibe sind in den Unteransprüchen aufgeführt.Advantageous further developments of the residual air gap disc according to the invention are listed in the subclaims.

Um außerhalb der mit der Strukturierung versehenen Bereiche der Restluftspaltscheibe an der betreffenden Stirnseite der Restluftspaltscheibe bekannte bzw. definierte Verhältnisse auszubilden, ist es darüber hinaus vorgesehen, dass die die Strukturierung aufweisende Stirnseite der Restluftspaltscheibe außerhalb der Strukturierung eben ausgebildet ist oder wenigstens einen Grat aufweist. Der Grat kann dabei insbesondere durch einen Fertigungsprozess der Restluftspaltscheibe beim Ausstanzen derselben aus einem Blechcoil entstehen. Dadurch, dass der Grat auf der dem Elektromagneten abgewandten Stirnseite der Restluftspaltscheibe angeordnet ist, wird darüber hinaus sichergestellt, dass die dem Elektromagneten zugewandte Stirnseite der Restluftspaltscheibe, welche durch den Fertigungsprozess üblicherweise eben ausgebildet ist, besonders gut (hydraulisch) an dem Elektromagneten anhaftet.In order to form known or defined conditions outside the areas of the residual air gap disc provided with the structuring on the relevant end face of the remaining air gap disc, it is also provided that the end face of the remaining air gap disc having the structure is flat outside the structuring or has at least one burr. The burr can arise in particular through a manufacturing process of the residual air gap disk when it is punched out of a sheet metal coil. The fact that the burr is arranged on the end face of the residual air gap disc facing away from the electromagnet also ensures that the end face of the residual air gap disc facing the electromagnet, which is usually flat due to the manufacturing process, adheres particularly well (hydraulically) to the electromagnet.

Wie bereits erläutert, muss nicht die gesamte, dem Magnetanker zugewandte Stirnseite der Restluftspaltscheibe mit der Strukturierung versehen sein, vielmehr genügt es bzw. hat es sich als vorteilhaft herausgestellt, wenn die Fläche der Strukturierung zwischen 20% und 60%, vorzugsweise zwischen 25% und 50% der Stirnseite an der Restluftspaltscheibe beträgt. Dies hat den Vorteil, dass nicht die gesamte Stirnseite nachträglich oder während des Fertigungsprozesses der Restluftspaltscheibe mit der Strukturierung versehen werden muss. Dadurch wird die zur Ausbildung der Strukturierung erforderliche Fertigungszeit verringert bzw. die Herstellkosten reduziert.As already explained, the entire end face of the remaining air gap disc facing the magnet armature does not have to be provided with the structuring; rather, it is sufficient or has proven to be advantageous if the area of the structuring is between 20% and 60%, preferably between 25% and 50% of the face on the remaining air gap disc. This has the advantage that the entire face does not have to be provided with the structuring subsequently or during the manufacturing process of the remaining air gap disc. As a result, the production time required to form the structuring is reduced or the production costs are reduced.

Weiterhin ist es nicht erforderlich, dass die Strukturierung besonders große Tiefen bzw. Erhebungen aufweisen muss, welche ggf. mit entsprechenden Fertigungsverfahren relativ schwierig realisierbar sind. Vielmehr genügt es, wenn die Strukturelemente der Strukturierung, bezogen auf die Oberfläche der Restluftspaltscheibe, Tiefen zwischen 1µm und 5µm aufweisen.Furthermore, it is not necessary for the structuring to have particularly great depths or elevations, which may be relatively difficult to implement with corresponding manufacturing processes. Rather, it is sufficient if the structural elements of the structuring, based on the surface of the remaining air gap disc, have depths between 1 μm and 5 μm.

Ganz besonders bevorzugt ist es, wenn das zwischen der Restluftspaltscheibe und dem Magnetanker befindliche Fluid radial nach innen und außen abströmen kann, um ein hydraulisches Anhaften zu vermeiden. Daher ist es erfindungsgemäß vorgesehen, dass die Strukturierung radial verlaufende Nuten umfasst, die sich von einer inneren Umfangsfläche bis zu einer äußeren Umfangsfläche der Restluftspaltscheibe erstrecken.It is very particularly preferred if the fluid located between the residual air gap disc and the magnet armature can flow radially inwards and outwards in order to avoid hydraulic adhesion. Therefore it is according to the invention provided that the structuring comprises radially extending grooves which extend from an inner circumferential surface to an outer circumferential surface of the residual air gap disc.

Die soweit beschriebene Strukturierung mit Strukturelementen mit einer Tiefe zwischen 1µm und 5µm lassen sich in einer ersten bevorzugten Ausgestaltung durch einen Ätzprozess erzeugen, mit dessen Hilfe sich Strukturtiefen bis zu 5µm erzeugen lassen.The structuring described so far with structure elements with a depth between 1 μm and 5 μm can be produced in a first preferred embodiment by an etching process, with the aid of which structure depths of up to 5 μm can be produced.

Alternativ ist es auch denkbar, die Strukturierung durch eine Laserbearbeitung zu erzeugen. Mit einem derartigen Verfahren lassen sich typischerweise Strukturtiefen bis 2µm erzielen.Alternatively, it is also conceivable to generate the structuring by laser processing. With such a method, structure depths of up to 2 μm can typically be achieved.

Die erfindungsgemäße Ausgestaltung der Restluftspaltscheibe sieht vor, dass diese im Querschnitt an ihrer äußeren Umfangsfläche in Umfangsrichtung gewellt ausgebildet ist. Dies hat den Vorteil, dass über im Bereich des Magnetkerns ausgebildete Längsnuten Kraftstoff in Richtung des Niederdruckbereichs abströmen kann, wenn sich die Einbuchtungen an der Umfangsfläche in Überdeckung mit den Längsschlitzen befinden.The embodiment of the residual air gap disk according to the invention provides that it is designed to be corrugated in cross section on its outer circumferential surface in the circumferential direction. This has the advantage that fuel can flow out in the direction of the low-pressure area via longitudinal grooves formed in the area of the magnet core when the indentations on the circumferential surface are in overlap with the longitudinal slots.

Zuletzt umfasst die Erfindung auch einen Kraftstoffinjektor mit einem Magnetventil mit einer erfindungsgemäßen Restluftspaltscheibe. Dieser weist die eingangs erwähnten Vorteile der Vermeidung von Schließdauersprüngen während des Betriebs des Kraftstoffinjektors auf.Finally, the invention also comprises a fuel injector with a solenoid valve with a residual air gap disk according to the invention. This has the advantages mentioned at the beginning of avoiding jumps in the closing duration during operation of the fuel injector.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung.Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawing.

Diese zeigt in:

Fig. 1
die wesentlichen Bestandteile eines Magnetventils für einen Kraftstoffinjektor im Längsschnitt,
Fig. 2
die dem Magnetanker des Magnetventils gemäß Fig. 1 zugewandte Stirnseite einer Restluftspaltscheibe in Draufsicht und
Fig. 3
die dem Elektromagneten des Magnetventils gemäß Fig. 1 zugewandte Stirnseite der Restluftspaltscheibe in Draufsicht.
This shows in:
Fig. 1
the essential components of a solenoid valve for a fuel injector in longitudinal section,
Fig. 2
according to the armature of the solenoid valve Fig. 1 facing end face of a residual air gap disc in plan view and
Fig. 3
according to the electromagnet of the solenoid valve Fig. 1 facing end face of the remaining air gap disc in plan view.

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

In der Fig. 1 ist ein Magnetventil 10 als Bestandteil eines Kraftstoffinjektors 100 mit seinen wesentlichen Bestandteilen dargestellt. Bei dem Kraftstoffinjektor 100 handelt es sich insbesondere um einen Kraftstoffinjektor 100, wie er als Bestandteil eines sogenannten Common-Rail-Einspritzsystems zum Einspritzen von Kraftstoff in den Brennraum einer selbstzündenden Brennkraftmaschine verwendet wird.In the Fig. 1 a solenoid valve 10 is shown as part of a fuel injector 100 with its essential components. The fuel injector 100 is, in particular, a fuel injector 100 of the kind used as part of a so-called common rail injection system for injecting fuel into the combustion chamber of a compression-ignition internal combustion engine.

Zur Steuerung eines Flüssigkeitsstroms bzw. der Einspritzmenge des Kraftstoffinjektors 100 in den Brennraum der Brennkraftmaschine weist das Magnetventil 10 ein Gehäuse 11 auf, in dem ein Magnetkern 12 angeordnet ist. In einer Ausnehmung 13 des Magnetkerns 12, die in Form einer Ringnut ausgebildet ist, ist eine Magnetspule 14 als Bestandteil eines Elektromagneten 15 angeordnet. Weiterhin weist der ringförmige Magnetkern 12 eine Längsbohrung in Form einer Durchgangsbohrung 16 auf, in der ein Ankerbolzen 17 angeordnet ist. An einem Bund 18 des Ankerbolzens 17 stützt sich eine Druckfeder 20 ab, die den Ankerbolzen 17 in eine Richtung weg von dem Magnetkern 14 bzw. den Elektromagneten 15 kraftbeaufschlagt.To control a liquid flow or the injection quantity of the fuel injector 100 into the combustion chamber of the internal combustion engine, the solenoid valve 10 has a housing 11 in which a magnetic core 12 is arranged. In a recess 13 of the magnet core 12, which is designed in the form of an annular groove, a magnet coil 14 is arranged as part of an electromagnet 15. Furthermore, the annular magnetic core 12 has a longitudinal bore in the form of a through bore 16 in which an anchor bolt 17 is arranged. A compression spring 20 is supported on a collar 18 of the armature bolt 17 and acts on the armature bolt 17 in a direction away from the magnet core 14 or the electromagnet 15.

Auf der der Druckfeder 20 gegenüberliegenden Seite des Bunds 18 ist ein Magnetanker 25 auf dem Ankerbolzen 17 angeordnet. Der Magnetanker 25 weist auf der dem Magnetkern 14 zugewandten Seite eine plane Stirnfläche 26 auf, die in bestromten Zustand des Elektromagneten 15 an einer Restluftspaltscheibe 30 bereichsweise anliegt. Zwischen der Stirnfläche 26 und der gegenüberliegenden Stirnfläche 31 des Magnetkerns 14 ist ein Restluftspalt 32 ausgebildet.On the side of the collar 18 opposite the compression spring 20, a magnet armature 25 is arranged on the armature bolt 17. On the side facing the magnet core 14, the magnet armature 25 has a flat end face 26 which, when the electromagnet 15 is energized, rests against a residual air gap disk 30 in some areas. A residual air gap 32 is formed between the end face 26 and the opposite end face 31 of the magnet core 14.

Die ringförmige Restluftspaltscheibe 30 weist eine innere Umfangsfläche 33 und eine äußere Umfangsfläche 34 auf. Wie am besten anhand der Fig. 2 und 3 erkennbar ist, ist die äußere Umfangsfläche 34 in Draufsicht in Umfangsrichtung gewellt ausgebildet, während die innere Umfangsfläche 33 kreisförmig ausgebildet ist.The annular residual air gap disk 30 has an inner peripheral surface 33 and an outer peripheral surface 34. How best with the Figs. 2 and 3 can be seen, the outer circumferential surface 34 is in plan view in the circumferential direction formed corrugated, while the inner peripheral surface 33 is formed circular.

Die Restluftspaltscheibe 30 besteht insbesondere aus Stahl und ist im Stanzverfahren aus einem Blechband bzw. -coil durch Ausstanzen hergestellt. Anhand der Fig. 3 ist erkennbar, dass die dem Magnetkern 12 zugewandte Stirnseite 35 der Restluftspaltscheibe 30 eben bzw. glatt ausgebildet ist, wobei die Rauheit bzw. Ebenheit der Stirnseite 35 allein durch den Urformprozess der Restluftspaltscheibe 30 bzw. ggf. vorgesehene Bearbeitungsschritte bestimmt ist. Demgegenüber weist entsprechend der Fig. 2 die dem Magnetanker 25 zugewandte Stirnseite 36 der Restluftspaltscheibe 30 eine Strukturierung 38 auf.The residual air gap disk 30 consists in particular of steel and is produced in the punching process from a sheet metal strip or coil by punching out. Based on Fig. 3 It can be seen that the end face 35 of the residual air gap disk 30 facing the magnet core 12 is flat or smooth, the roughness or flatness of the end face 35 being determined solely by the primary forming process of the residual air gap disk 30 or possibly provided processing steps. In contrast, the Fig. 2 the end face 36 of the residual air gap disk 30 facing the magnet armature 25 has a structure 38.

Die Strukturierung 38 umfasst eine Vielzahl von radial zwischen der inneren Umfangsfläche 33 und der äußeren Umfangsfläche 34 verlaufende Nuten 39 als Strukturelemente auf. Die Nuten 39 sind beispielsweise durch einen Ätzvorgang, oder aber durch eine Laserstrahlbehandlung ausgebildet, und weisen gegenüber den Bereichen 40, in denen keine Strukturierung 38 vorgesehen ist, eine Tiefe zwischen 1µm und 5µm, abhängig von dem Fertigungsverfahren zur Ausbildung der Strukturierung 38, auf. Die Fläche der Strukturierung 38 beträgt zwischen 20% und 60%, vorzugsweise zwischen 25% und 50% der Fläche der Stirnseite 36. Weiterhin sind die einzelnen Nuten 39 vorzugsweise in gleichgroßen Winkelabständen zur Längsachse der Restluftspaltscheibe 30 angeordnet. Ggf. weist die Restluftspaltscheibe 30 auf der Stirnseite 36 im Bereich der inneren Umfangsfläche 33 bzw. der äußeren Umfangsfläche 34 senkrecht zur Zeichenrichtung der Fig. 2 verlaufende Grate 41, 42 auf, die durch den Stanzprozess hervorgerufen sind, und die über die Bereiche 40 ohne die Strukturierung 38 herausragen.The structuring 38 comprises a plurality of grooves 39 running radially between the inner circumferential surface 33 and the outer circumferential surface 34 as structural elements. The grooves 39 are formed, for example, by an etching process or by laser beam treatment, and have a depth of between 1 μm and 5 μm compared to the areas 40 in which no structuring 38 is provided, depending on the manufacturing process for forming the structuring 38. The area of the structuring 38 is between 20% and 60%, preferably between 25% and 50% of the area of the end face 36. Furthermore, the individual grooves 39 are preferably arranged at equal angular distances from the longitudinal axis of the remaining air gap disk 30. Possibly. shows the residual air gap disk 30 on the end face 36 in the area of the inner circumferential surface 33 or the outer circumferential surface 34 perpendicular to the drawing direction of the Fig. 2 running burrs 41, 42 which are caused by the stamping process and which protrude beyond the regions 40 without the structuring 38.

Die soweit beschriebene Restluftspaltscheibe 30 kann in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen.The residual air gap disk 30 described so far can be modified or modified in many ways without deviating from the inventive concept.

Claims (8)

  1. Residual air gap disc (30) for a solenoid valve (10), wherein the solenoid valve (10) serves for controlling a liquid flow in a fuel injector (100), having a first face side (35), which is assigned to an electromagnet (15), and having a second face side (36), which is assigned to a magnet armature (25), wherein the first face side (35) is designed to lie against the electromagnet (15), and the second face side (36) is designed to be either in contact with the magnet armature (25), or spaced apart therefrom, in a manner dependent on the electrical energization of the electromagnet (15),
    characterized
    in that the first face side of the residual air gap disc (30) is preferably of planar form and the second face side (36) of the residual air gap disc (30) is provided with a structuring (38), wherein the structural elements (39) comprise radially arranged grooves which extend from an inner peripheral surface (33) to an outer peripheral surface (34) of the residual air gap disc (30), and the residual air gap disc (30) is, in cross section, of undulating form in a peripheral direction at its outer peripheral surface (34).
  2. Residual air gap disc according to Claim 1,
    characterized
    in that the second face side (36) has, outside the structuring (38), regions (40) which are of planar form or which have at least one burr (41, 42).
  3. Residual air gap disc according to Claim 1 or 2,
    characterized
    in that the area of the structuring (38) amounts to between 20% and 60%, preferably between 25% and 50%, of the area of the second face side (36).
  4. Residual air gap disc according to any of Claims 1 to 3,
    characterized
    in that the depth of the structural elements (39) of the structuring (38) amounts to between 1 µm and 5 µm.
  5. Residual air gap disc according to any of Claims 1 to 4,
    characterized
    in that the structuring (38) is produced by means of an etching process.
  6. Residual air gap disc according to any of Claims 1 to 4,
    characterized
    in that the structuring (38) is produced by means of a laser machining process.
  7. Residual air gap disc according to any of Claims 1 to 6,
    characterized
    in that the residual air gap disc (30) is formed as a punched part.
  8. Fuel injector (100), having an electromagnet (10) for generating a magnetic force and having a movably arranged magnet armature (25), wherein the magnet armature (25) is movable in a longitudinal direction, counter to a resetting force of a spring element (20), by electrical energization of an electromagnet (15), and having a residual air gap disc (30) which is arranged between the electromagnet (15) and the magnet armature (25), wherein the residual air gap disc (30) is designed according to any of Claims 1 to 7.
EP17725915.7A 2016-06-13 2017-05-16 Residual air gap disk for a solenoid valve and fuel injector having a residual air gap disk Active EP3469207B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016210393.8A DE102016210393A1 (en) 2016-06-13 2016-06-13 Residual air gap disc for a solenoid valve and fuel injector with a residual air gap disc
PCT/EP2017/061653 WO2017215861A1 (en) 2016-06-13 2017-05-16 Residual air gap disk for a solenoid valve and fuel injector having a residual air gap disk

Publications (2)

Publication Number Publication Date
EP3469207A1 EP3469207A1 (en) 2019-04-17
EP3469207B1 true EP3469207B1 (en) 2020-10-14

Family

ID=58772865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17725915.7A Active EP3469207B1 (en) 2016-06-13 2017-05-16 Residual air gap disk for a solenoid valve and fuel injector having a residual air gap disk

Country Status (3)

Country Link
EP (1) EP3469207B1 (en)
DE (1) DE102016210393A1 (en)
WO (1) WO2017215861A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023144362A1 (en) 2022-01-31 2023-08-03 Robert Bosch Gmbh Magnet assembly for a fuel injector, and fuel injector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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US4245789A (en) * 1979-05-03 1981-01-20 General Motors Corporation Electromagnetic fuel injector
US5372313A (en) * 1993-02-16 1994-12-13 Siemens Automotive L.P. Fuel injector
DE102009003213A1 (en) 2009-05-19 2010-11-25 Robert Bosch Gmbh Residual air gap disc
DE102010064097A1 (en) * 2010-12-23 2012-06-28 Robert Bosch Gmbh Electromagnetically actuatable valve e.g. fuel injection valve of internal combustion engine, has movable valve needle with lower stopper comprising top stop face with elevations and depressions on which armature rests
JP2012246789A (en) * 2011-05-25 2012-12-13 Denso Corp Fuel injection valve
DE102011086284A1 (en) * 2011-11-14 2013-05-16 Robert Bosch Gmbh Solenoid valve with a magnet assembly
KR101280133B1 (en) 2012-07-25 2013-06-28 김도희 Pad spring for disc brake and manufacturing method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023144362A1 (en) 2022-01-31 2023-08-03 Robert Bosch Gmbh Magnet assembly for a fuel injector, and fuel injector
DE102022200978A1 (en) 2022-01-31 2023-08-03 Robert Bosch Gesellschaft mit beschränkter Haftung Magnet assembly for a fuel injector and fuel injector

Also Published As

Publication number Publication date
WO2017215861A1 (en) 2017-12-21
EP3469207A1 (en) 2019-04-17
DE102016210393A1 (en) 2017-12-14

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