EP3469207A1 - 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

Info

Publication number
EP3469207A1
EP3469207A1 EP17725915.7A EP17725915A EP3469207A1 EP 3469207 A1 EP3469207 A1 EP 3469207A1 EP 17725915 A EP17725915 A EP 17725915A EP 3469207 A1 EP3469207 A1 EP 3469207A1
Authority
EP
European Patent Office
Prior art keywords
air gap
residual air
face
gap disc
electromagnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17725915.7A
Other languages
German (de)
French (fr)
Other versions
EP3469207B1 (en
Inventor
Thomas Nierychlo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3469207A1 publication Critical patent/EP3469207A1/en
Application granted granted Critical
Publication of EP3469207B1 publication Critical patent/EP3469207B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

  • Residual air gap disc for a solenoid valve and fuel in jektor with one
  • the invention relates to a residual air gap disc for a solenoid valve according to the preamble of claim 1. Furthermore, the invention relates to a fuel injector using a residual air gap disc according to the invention.
  • a residual air gap disk according to the preamble of claim 1 is known from DE 10 2009 003 213 A1 of the Applicant.
  • the known, consisting of metal residual air gap disc is characterized by formed on the outer circumference, radially outwardly projecting tongues, an axial
  • a residual air gap disk for a solenoid valve with the features of claim 1 has the advantage that a lower or no hydraulic adhesion between the armature and the residual air gap disc occurs without the damping behavior during the opening process of
  • Magnetic armature which is usually part of a valve seat for controlling a liquid flow, is significantly deteriorated, 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
  • Residual air gap disk always adheres to the electromagnet or the magnetic core. This leads to an avoidance of the o.g. Closing stops during operation of a fuel injector equipped with a solenoid valve.
  • the invention is based on the idea by structuring the
  • the front side of the structure having the rest of the air gap disc forms well-known or defined ratios at the relevant end face of the residual air gap disc
  • Restluftspaltis outside the structuring is flat or at least has a ridge.
  • the burr can arise in particular by a manufacturing process of the residual air gap disc when punching the same from a sheet metal coil. Due to the fact that the ridge on the
  • Electromagnet remote end face of the residual air gap disc is also ensured that the electromagnet
  • Manufacturing process is usually trained, especially good
  • the entire, the magnet armature facing the end face of the residual air gap disc need not be provided with the structuring, but it is sufficient or has proven to be advantageous if the surface of the structuring between 20% and 60%, preferably between 25% and 50% of the front side of the residual air gap disc is.
  • This has the advantage that it is not necessary to provide the entire front side subsequently or during the production process of the residual air gap disk with the structuring. As a result, the production time required for the formation of the structuring is reduced or the manufacturing costs are reduced.
  • the structuring must have particularly large depths or elevations, which are possibly 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 residual air gap disk, have depths between 1 ⁇ and 5 ⁇ .
  • the fluid located between the residual air gap disk and the magnet armature can flow off radially inwards and outwards in order to avoid hydraulic adhesion. Therefore, it is preferable provided that the structuring comprises radially extending grooves extending from an inner circumferential surface to an outer peripheral surface of the residual air gap disc.
  • the structure described so far with structural elements having a depth between 1 ⁇ and 5 ⁇ can be produced in a first preferred embodiment by an etching process, with the help of which structure depths can be generated up to 5 ⁇ .
  • a further preferred embodiment of the residual air gap disc provides that it is formed in the circumferential direction in cross-section on its outer peripheral surface in the circumferential direction. This has the advantage that fuel can flow out in the direction of the low-pressure region via longitudinal grooves formed in the region of the magnetic core, when the indentations on the circumferential surface in
  • the invention also includes a fuel injector with a
  • Solenoid valve with a residual air disc according to the invention. This has the above-mentioned advantages of avoiding Sch.dauersprüngen during operation of the fuel injector.
  • Fig. 1 shows the essential components of a solenoid valve for a
  • Fig. 1 is a solenoid valve 10 as part of a fuel! Njektors 100 shown with its essential components.
  • the fuel injector 100 is, in particular, a fuel injector 100, as it is known
  • Component of a so-called common rail injection system for injecting fuel into the combustion chamber of a self-igniting internal combustion engine is used.
  • a magnetic core 12 In a recess 13 of the magnetic core 12, which is formed in the form of an annular groove, a magnetic coil 14 is arranged as part of an electromagnet 15. Furthermore, the annular magnetic core 12 has a
  • Magnetic core 14 and the electromagnet 15 is subjected to force.
  • a magnet armature 25 is arranged on the anchor bolt 17.
  • the magnet armature 25 has, on the side facing the magnetic core 14, a plane end face 26 which, in the energized state of the electromagnet 15, bears against a residual air gap disk 30 in regions. Between the end face 26 and the opposite end face 31 of the magnetic core 14, a residual air gap 32 is formed.
  • the annular residual air gap disk 30 has an inner peripheral surface 33 and an outer peripheral surface 34. As best seen with reference to FIGS. 2 and 3, the outer peripheral surface 34 in plan view in the circumferential direction formed wavy, while the inner peripheral surface 33 is circular.
  • the residual air gap disc 30 is made in particular of steel and is in
  • the end face 35 of the residual air gap disk 30 facing the magnetic core 12 is planar or smooth, the roughness or flatness of the end face 35 being determined solely by the primary molding process of the residual air gap disk 30 or possibly provided processing steps .
  • the magnet armature 25 facing end face 36 of the residual air gap disk 30 has a structuring 38.
  • the structuring 38 comprises a plurality of grooves 39 extending radially between the inner circumferential surface 33 and the outer peripheral surface 34 as structural elements.
  • the grooves 39 are formed, for example, by an etching process or by a laser beam treatment, and have a depth between 1 ⁇ and ⁇ , depending on the manufacturing process for forming the structuring 38, compared to the areas 40, in which no structuring 38 is provided ,
  • the surface 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 of equal size
  • Angular distances to the longitudinal axis of the residual air gap disc 30 is arranged. Possibly. has the residual air gap disc 30 on the end face 36 in the region of the inner peripheral surface 33 and the outer peripheral surface 34 perpendicular to

Landscapes

  • 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)

Abstract

The invention relates to a residual air gap disk (30) for a solenoid valve (10), wherein the solenoid valve (10) serves to control a liquid flow in a fuel injector (100), comprising a first end face (35) associated with an electromagnet (15) and a second end face (36) associated with a magnet armature (25), wherein the first end face (35) is designed to lie against the electromagnet (15) and the second end face (36) is designed either to be in contact with the magnet armature (25) or to be spaced apart therefrom in accordance with the energization of the electromagnet (15). According to the invention, the first end face (35) of the residual air gap disk (30) is preferably flat and the second end face (36) of the residual air gap disk (30) is provided with a structure (38).

Description

Beschreibung  description
Restluftspaltscheibe für ein Magnetventil und Kraftstoff in jektor mit einer Residual air gap disc for a solenoid valve and fuel in jektor with one
Restluftspaltscheibe Residual air gap disc
Stand der Technik State 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 disc for a solenoid valve according to the preamble of claim 1. Furthermore, the invention relates to a fuel injector using a residual air gap disc 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 A residual air gap disk according to the preamble of claim 1 is known from DE 10 2009 003 213 A1 of the Applicant. The known, consisting of metal residual air gap disc is characterized by formed on the outer circumference, radially outwardly projecting tongues, an axial
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. Allow jamming or positioning of the residual air gap disk in the region of a pinch point of a magnetic sleeve. The production of such a residual air disc and their assembly in a solenoid valve are relatively expensive. Furthermore, the geometry of the magnetic sleeve must be adjusted with a view to the entrapment of the residual 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. Furthermore, it is known from DE 10 2013 2012 238 A1 of the applicant, a further residual air gap disc, which consists of a ceramic material which is very heat resistant and does not deform plastically. This ensures a particularly high reliability of the function over the entire service life of a solenoid valve equipped with such a residual air gap disk.
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 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 adhesion of the magnet armature to the residual air gap disk should be prevented or avoided in a position in which the electromagnet attracts the magnet armature. In the residual air gap discs, which are not axially fixed by frictional connection in contrast to the aforementioned residual air gap disc However, hydraulic adhesion or adhesion can take place, which, depending on the obliquity between the electromagnet and the magnet armature facing end face of the residual air gap disk causes the
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 Restluftspaltscheibe either on the magnetic core of the electromagnet, or in the region of the armature adheres to this. This undefined adhesion behavior of the residual air gap disc results during operation of the solenoid valve when installed in a fuel injector different
Schließdauern einer Düsennadel, sogenannte Schließdauersprünge. Closing times of a nozzle needle, so-called Schließdauersprünge.
Offenbarung der Erfindung Disclosure 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 A residual air gap disk for a solenoid valve with the features of claim 1 has the advantage that a lower or no hydraulic adhesion between the armature and the residual air gap disc occurs without the damping behavior during the opening process of
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. Magnetic armature, which is usually part of a valve seat for controlling a liquid flow, is significantly deteriorated, 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
Anhaftverhalten zwischen dem Elektromagneten bzw. dessen Magnetkern und der Restluftspaltscheibe beibehalten, damit sichergestellt ist, dass die Maintain adhesion behavior between the electromagnet or its magnetic core and the residual air gap disc, in order to ensure that the
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. Residual air gap disk always adheres to the electromagnet or the magnetic core. This leads to an avoidance of the o.g. Closing stops during operation of a fuel injector equipped with a solenoid valve.
Der Erfindung liegt die Idee zugrunde, durch eine Strukturierung der dem The invention is based on the idea by structuring the
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. Vorteilhafte Weiterbildungen der erfindungsgemäßen Restluftspaltscheibe sind in den Unteransprüchen aufgeführt. Magnetanker facing end side of the residual air gap disc to prevent hydraulic adhesion or sticking of the residual air gap disc to the armature. In particular, such structuring effects a reduction in the contact area between the residual air gap disk and the magnet armature or in an enlargement of a hydraulic gap in the region of depressions of the structuring and the magnet armature. As a result, the hydraulic adhesion action between the residual air gap disk and the magnet armature on the mutually facing end faces is reduced. Advantageous 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 To outside the textured areas of the
Restluftspaltscheibe an der betreffenden Stirnseite der Restluftspaltscheibe bekannte bzw. definierte Verhältnisse auszubilden, ist es darüber hinaus vorgesehen, dass die die Strukturierung aufweisende Stirnseite der It is moreover provided that the front side of the structure having the rest of the air gap disc forms well-known or defined ratios at the relevant end face of the residual air gap disc
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 Restluftspaltscheibe outside the structuring is flat or at least has a ridge. The burr can arise in particular by a manufacturing process of the residual air gap disc when punching the same from a sheet metal coil. Due to the fact that the ridge on the
Elektromagneten abgewandten Stirnseite der Restluftspaltscheibe angeordnet ist, wird darüber hinaus sichergestellt, dass die dem Elektromagneten Electromagnet remote end face of the residual air gap disc is also ensured that the electromagnet
zugewandte Stirnseite der Restluftspaltscheibe, welche durch den facing end face of the residual air gap disk, which by the
Fertigungsprozess üblicherweise eben ausgebildet ist, besonders gut Manufacturing process is usually trained, especially good
(hydraulisch) an dem Elektromagneten anhaftet. (Hydraulic) adheres 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, the magnet armature facing the end face of the residual air gap disc need not be provided with the structuring, but it is sufficient or has proven to be advantageous if the surface of the structuring between 20% and 60%, preferably between 25% and 50% of the front side of the residual air gap disc is. This has the advantage that it is not necessary to provide the entire front side subsequently or during the production process of the residual air gap disk with the structuring. As a result, the production time required for the formation of the structuring is reduced or the manufacturing 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 1 μηι und 5μηι aufweisen. Furthermore, it is not necessary that the structuring must have particularly large depths or elevations, which are possibly 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 residual air gap disk, have depths between 1 μηι and 5μηι.
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 bevorzugt 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 disk and the magnet armature can flow off radially inwards and outwards in order to avoid hydraulic adhesion. Therefore, it is preferable provided that the structuring comprises radially extending grooves extending from an inner circumferential surface to an outer peripheral surface of the residual air gap disc.
Die soweit beschriebene Strukturierung mit Strukturelementen mit einer Tiefe zwischen 1 μηι und 5μηι lassen sich in einer ersten bevorzugten Ausgestaltung durch einen Ätzprozess erzeugen, mit dessen Hilfe sich Strukturtiefen bis zu 5μηι erzeugen lassen. The structure described so far with structural elements having a depth between 1 μηι and 5μηι can be produced in a first preferred embodiment by an etching process, with the help of which structure depths can be generated up to 5μηι.
Alternativ ist es auch denkbar, die Strukturierung durch eine Laserbearbeitung zu erzeugen. Mit einem derartigen Verfahren lassen sich typischerweise Alternatively, it is also conceivable to produce the structuring by laser processing. With such a method can be typically
Strukturtiefen bis 2μηι erzielen. Achieve structure depths of up to 2 μm.
Eine weitere bevorzugte 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 A further preferred embodiment of the residual air gap disc provides that it is formed in the circumferential direction in cross-section on its outer peripheral surface in the circumferential direction. This has the advantage that fuel can flow out in the direction of the low-pressure region via longitudinal grooves formed in the region of the magnetic core, when the indentations on the circumferential surface in
Überdeckung mit den Längsschlitzen befinden. Cover with the longitudinal slots are located.
Zuletzt umfasst die Erfindung auch einen Kraftstoffinjektor mit einem Finally, the invention also includes a fuel injector with a
Magnetventil mit einer erfindungsgemäßen Restluftspaltscheibe. Dieser weist die eingangs erwähnten Vorteile der Vermeidung von Schließdauersprüngen während des Betriebs des Kraftstoffinjektors auf. Solenoid valve with a residual air disc according to the invention. This has the above-mentioned advantages of avoiding Schließdauersprüngen 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 will become apparent from the following description of preferred embodiments and from the drawing.
Diese zeigt in: This shows in:
Fig. 1 die wesentlichen Bestandteile eines Magnetventils für einen Fig. 1 shows the essential components of a solenoid valve for a
Kraftstoffinjektor im Längsschnitt,  Fuel injector in longitudinal section,
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. Fig. 2, the magnet armature of the solenoid valve of FIG. 1 facing end face of a residual air gap disc in plan view and Fig. 3, the electromagnet of the solenoid valve of FIG. 1 facing end side of the residual air gap disc in plan view.
Gleiche Elemente bzw. Element mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen. Identical elements or elements with the same function are provided in the figures with the same reference numerals.
In der Fig. 1 ist ein Magnetventil 10 als Bestandteil eines Kraftstoff! njektors 100 mit seinen wesentlichen Bestandteilen dargestellt. Bei dem Kraftstoffinjektor 100 handelt es sich insbesondere um einen Kraftstoffinjektor 100, wie er als In Fig. 1 is a solenoid valve 10 as part of a fuel! Njektors 100 shown with its essential components. The fuel injector 100 is, in particular, a fuel injector 100, as it is known
Bestandteil eines sogenannten Common-Rail-Einspritzsystems zum Einspritzen von Kraftstoff in den Brennraum einer selbstzündenden Brennkraftmaschine verwendet wird. Component of a so-called common rail injection system for injecting fuel into the combustion chamber of a self-igniting internal combustion engine is used.
Zur Steuerung eines Flüssigkeitsstroms bzw. der Einspritzmenge des For controlling a liquid flow or the injection quantity of
Kraftstoffinjektors 100 in den Brennraum der Brennkraftmaschine weist das Magnetventil 10 ein Gehäuse 1 1 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 Fuel injector 100 in the combustion chamber of the internal combustion engine, the solenoid valve 10, a housing 1 1, in which a magnetic core 12 is arranged. In a recess 13 of the magnetic core 12, which is formed in the form of an annular groove, a magnetic coil 14 is arranged as part of an electromagnet 15. Furthermore, the annular magnetic core 12 has a
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 Longitudinal bore in the form of a through hole 16 in which an anchor bolt 17 is arranged. On a collar 18 of the anchor bolt 17, a compression spring 20 is supported, which the anchor bolt 17 in a direction away from the
Magnetkern 14 bzw. den Elektromagneten 15 kraftbeaufschlagt. Magnetic core 14 and the electromagnet 15 is subjected to force.
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 compression spring 20 opposite side of the collar 18, a magnet armature 25 is arranged on the anchor bolt 17. The magnet armature 25 has, on the side facing the magnetic core 14, a plane end face 26 which, in the energized state of the electromagnet 15, bears against a residual air gap disk 30 in regions. Between the end face 26 and the opposite end face 31 of the magnetic core 14, a residual air gap 32 is formed.
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. As best seen with reference to FIGS. 2 and 3, the outer peripheral surface 34 in plan view in the circumferential direction formed wavy, while the inner peripheral surface 33 is circular.
Die Restluftspaltscheibe 30 besteht insbesondere aus Stahl und ist im The residual air gap disc 30 is made in particular of steel and is in
Stanzverfahren aus einem Blechband bzw. -coil durch Ausstanzen hergestellt.Punching of a sheet metal strip or -coil produced by punching.
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. It can be seen from FIG. 3 that the end face 35 of the residual air gap disk 30 facing the magnetic core 12 is planar or smooth, the roughness or flatness of the end face 35 being determined solely by the primary molding process of the residual air gap disk 30 or possibly provided processing steps , In contrast, according to FIG. 2, the magnet armature 25 facing end face 36 of the residual air gap disk 30 has a structuring 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 1 μηι und δμηη, 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 The structuring 38 comprises a plurality of grooves 39 extending radially between the inner circumferential surface 33 and the outer peripheral surface 34 as structural elements. The grooves 39 are formed, for example, by an etching process or by a laser beam treatment, and have a depth between 1 μηι and δμηη, depending on the manufacturing process for forming the structuring 38, compared to the areas 40, in which no structuring 38 is provided , The surface 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 of equal size
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 Angular distances to the longitudinal axis of the residual air gap disc 30 is arranged. Possibly. has the residual air gap disc 30 on the end face 36 in the region of the inner peripheral surface 33 and the outer peripheral surface 34 perpendicular to
Zeichenrichtung der Fig. 2 verlaufende Grate 41 , 42 auf, die durch den Drawing direction of FIG. 2 extending ridges 41, 42, which through the
Stanzprozess hervorgerufen sind, und die über die Bereiche 40 ohne die Stamping process are caused, and over the areas 40 without the
Strukturierung 38 herausragen. Striking structure 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 departing from the spirit of the invention.

Claims

Ansprüche  claims
1 . Restluftspaltscheibe (30) für ein Magnetventil (10), wobei das Magnetventil (10) zur Steuerung eines Flüssigkeitsstroms in einem Kraftstoffinjektor (100) dient, mit einer einem Elektromagneten (15) zugeordneten ersten Stirnseite1 . A residual air gap disc (30) for a solenoid valve (10), the solenoid valve (10) serving to control a fluid flow in a fuel injector (100) with a first end face associated with an electromagnet (15)
(35) und einer einem Magnetanker (25) zugeordneten zweiten Stirnseite(35) and a magnet armature (25) associated second end face
(36) , wobei die erste Stirnseite (35) dazu ausgebildet ist, an dem (36), wherein the first end face (35) is formed on the
Elektromagneten (15) anzuliegen und die zweite Stirnseite (36) dazu ausgebildet ist, in Abhängigkeit von der Bestromung des Elektromagneten (15) entweder in Kontakt mit dem Magnetanker (25) oder zu diesem beabstandet zu sein, dadurch gekennzeichnet, dass die erste Stirnseite (35) der Restluftspaltscheibe (30) vorzugsweise eben ausgebildet ist und die zweite Stirnseite (36) der Restluftspaltscheibe (30) mit einer Strukturierung (38) versehen ist.  Electromagnet (15) abut and the second end face (36) is adapted to be in dependence on the energization of the electromagnet (15) either in contact with the armature (25) or spaced therefrom, characterized in that the first end face ( 35) of the residual air gap disc (30) is preferably flat and the second end face (36) of the residual air gap disc (30) is provided with a structuring (38).
2. Restluftspaltscheibe nach Anspruch 1 , 2. residual air gap disc according to claim 1,
dadurch gekennzeichnet,  characterized,
dass die zweite Stirnseite (36) außerhalb der Strukturierung (38) Bereiche (40) aufweist, die eben ausgebildet sind oder wenigstens einen Grat (41 , 42) aufweisen.  the second end face (36) outside the structuring (38) has regions (40) which are flat or have at least one ridge (41, 42).
3. Restluftspaltscheibe nach Anspruch 1 oder 2, 3. residual air gap disc according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass die Fläche der Strukturierung (38) zwischen 20% und 60%,  that the area of structuring (38) is between 20% and 60%,
vorzugsweise zwischen 25% und 50% der Fläche der zweiten Stirnseite (36) beträgt.  preferably between 25% and 50% of the area of the second end face (36).
4. Restluftspaltscheibe nach einem der Ansprüche 1 bis 3, 4. residual air gap disc according to one of claims 1 to 3,
dadurch gekennzeichnet,  characterized,
dass die Tiefe der Strukturelemente (39) der Strukturierung (38) zwischen 1 μηι und 5μηι beträgt. Restluftspaltscheibe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, that the depth of the structural elements (39) of the structuring (38) is between 1 μηι and 5μηι. Residual air gap disc according to one of Claims 1 to 4, characterized
dass die Strukturelemente (39) radial angeordnete Nuten umfassen, die sich von einer inneren Umfangsfläche (33) bis zu einer äußeren Umfangsfläche (34) der Restluftspaltscheibe (30) erstrecken.  in that 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).
6. Restluftspaltscheibe nach einem der Ansprüche 1 bis 5, 6. residual air gap disc according to one of claims 1 to 5,
dadurch gekennzeichnet,  characterized,
dass die Strukturierung (38) durch einen Ätzprozeß erzeugt ist.  the structuring (38) is produced by an etching process.
7. Restluftspaltscheibe nach einem der Ansprüche 1 bis 5, 7. residual air gap disc according to one of claims 1 to 5,
dadurch gekennzeichnet,  characterized,
dass die Strukturierung (38) durch eine Laserbearbeitung erzeugt ist.  the structuring (38) is produced by laser processing.
8. Restluftspaltscheibe nach einem der Ansprüche 1 bis 7, 8. residual air gap disc according to one of claims 1 to 7,
dadurch gekennzeichnet,  characterized,
dass die Restluftspaltscheibe (30) als Stanzteil ausgebildet ist. 9. Restluftspaltscheibe nach einem der Ansprüche 1 bis 8,  the residual air gap disk (30) is formed as a stamped part. 9. residual air gap disc according to one of claims 1 to 8,
dadurch gekennzeichnet,  characterized,
dass die Restluftspaltscheibe (30) im Querschnitt an ihrer äußeren  that the residual air gap disc (30) in cross-section at its outer
Umfangsfläche (34) in Umfangsrichtung gewellt ausgebildet ist. 10. Kraftstoffinjektor (100), mit einem Elektromagneten (10) zur Erzeugung einer magnetischen Kraft und einem beweglich angeordneten Magnetanker (25), wobei der Magnetanker (25) durch Bestromung eines Elektromagneten (15) in einer Längsrichtung entgegen einer Rückstell kraft eines Federelements (20) bewegbar ist, und mit einer Restluftspaltscheibe (30), die zwischen dem Elektromagneten (15) und dem Magnetanker (25) angeordnet ist, wobei die Peripheral surface (34) is formed corrugated in the circumferential direction. 10. Fuel injector (100), with an electromagnet (10) for generating a magnetic force and a movably arranged magnet armature (25), wherein the magnet armature (25) by energizing an electromagnet (15) in a longitudinal direction against a restoring force of a spring element ( 20) is movable, and with a residual air gap disc (30) which is arranged between the electromagnet (15) and the magnet armature (25), wherein the
Restluftspaltscheibe (30) nach einem der Ansprüche 1 bis 9 ausgebildet ist. Residual air gap disc (30) according to one of claims 1 to 9 is formed.
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 true EP3469207A1 (en) 2019-04-17
EP3469207B1 EP3469207B1 (en) 2020-10-14

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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)

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

Families Citing this family (2)

* 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
DE102022200978A1 (en) 2022-01-31 2023-08-03 Robert Bosch Gesellschaft mit beschränkter Haftung Magnet assembly for a fuel injector and fuel injector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245789A (en) * 1979-05-03 1981-01-20 General Motors Corporation Electromagnetic fuel injector
US5381965A (en) * 1993-02-16 1995-01-17 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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EP3469207B1 (en) 2020-10-14
WO2017215861A1 (en) 2017-12-21

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