EP2746565A1 - Magnet module for a fuel injector, method for producing a magnet module and fuel injector - Google Patents

Magnet module for a fuel injector, method for producing a magnet module and fuel injector Download PDF

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Publication number
EP2746565A1
EP2746565A1 EP13191504.3A EP13191504A EP2746565A1 EP 2746565 A1 EP2746565 A1 EP 2746565A1 EP 13191504 A EP13191504 A EP 13191504A EP 2746565 A1 EP2746565 A1 EP 2746565A1
Authority
EP
European Patent Office
Prior art keywords
pole tube
magnetic
magnet
armature
outer pole
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
EP13191504.3A
Other languages
German (de)
French (fr)
Other versions
EP2746565B1 (en
Inventor
Michael Krause
Lars Olems
Matthias Horn
Marco Beier
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2746565A1 publication Critical patent/EP2746565A1/en
Application granted granted Critical
Publication of EP2746565B1 publication Critical patent/EP2746565B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/128—Encapsulating, encasing or sealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/08—Fuel-injection apparatus having special means for influencing magnetic flux, e.g. for shielding or guiding magnetic flux
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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

Definitions

  • the invention relates to a magnet assembly for a fuel injector according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a magnet assembly according to the invention and a fuel injector using a magnet assembly according to the invention.
  • a magnet assembly according to the preamble of claim 1 is known from DE 10 2010 001 486 A1 the applicant known.
  • the fuel discharge from a control chamber is influenced in a fuel injector, whereby a stroke movement of a nozzle needle is controlled.
  • a magnetic coil is inserted in a magnetic core, which are arranged on a front side in registration with a magnet armature.
  • the magnet armature is pulled in the direction of the magnet coil so that the magnet armature releases a sealing seat on the side opposite the magnet coil, via which fuel can flow out of the addressed control chamber.
  • both the armature and the magnetic coil and the magnetic core are arranged in a portion of the fuel injector, in which the fuel is located.
  • the fuel thus comes into contact in particular with the magnetic coil, so that it must be specially designed.
  • relatively high temperatures of the fuel which may be up to 190 ° C. at a system pressure of, for example, 2000 bar, are a problem.
  • the sealing of the bobbin or its connection pins in the direction of the electrical connections for controlling the Magnetic module critical.
  • the magnetic coil of the armature Although one could try to hydraulically separate by a corresponding separator, the magnetic coil of the armature, however, the increased axial distance between the magnetic coil and the magnetic core, however, lowers the efficiency of the magnet assembly or makes it necessary to use a larger solenoid coil to achieve a certain magnetic force in turn, which in turn entails a number of disadvantages, in particular with regard to the installation space and the manufacturing costs of the magnet assembly.
  • the present invention seeks to develop a magnetic assembly for a fuel injector according to the preamble of claim 1 such that in addition to the hydraulic separation between the area is arranged in the armature of the area in which the Magnetic coil and the magnetic core are, even when using relatively small or weak magnetic coils, a relatively high magnetic force can be achieved on the armature.
  • a magnetic assembly for a fuel injector with the features of claim 1, characterized in that the magnetic core and the magnetic coil are accommodated in a pole tube housing, which consists of a mecanicpolrohr and a participatpolrohr, which are arranged concentrically to each other, wherein between the inner pole tube and the outer pole tube on the magnet armature side facing a preferably arranged perpendicular to the longitudinal axis of the magnet armature partition is formed in which in at least partial overlap with the end face of the magnetic coil, a non-magnetic intermediate element is arranged, wherein the pole tube housing in the region of the partition in at least partial coverage with the magnetic core has at least one magnetically active wall section or at least one magnetically active pole body, and wherein the partition wall, a hydraulic seal between a pressure chamber for the armature and a recording eraum for the magnetic coil and the magnetic core is formed.
  • the invention thus makes it possible on the one hand, a hydraulic separation between the fuel-carrying region in which the magnet armature is located from the region of the magnetic coil and the Form magnetic core, and on the other hand by a magnetically formed region which is arranged in register with the end face of the magnetic coil on the side facing the magnet armature, to influence the magnetic flux such that the magnetic field lines are guided over the magnetically active region of the partition wall, whereby the increases magnetic field strength and thus can achieve an increased magnetic force on the armature.
  • the inner pole tube and the outer pole tube consist of magnetic material.
  • a magnetic material is meant in particular a ferromagnetic material which has the desired magnetic properties by appropriate magnetization.
  • Such a design has the advantage that only one non-magnetic intermediate element has to be arranged between the adjoining radial regions of the inner pole tube and the outer pole tube in the region of the dividing wall. As a result, the number of components or components for receiving the magnetic coil and the magnetic core can be reduced.
  • the inner pole tube and the outer pole tube consist of nonmagnetic material, and that the inner pole tube and the outer pole tube are connected in the region of the dividing wall with two magnetic ring bodies, between which the nonmagnetic intermediate element is arranged.
  • Such a design has the advantage that the outer pole tube and the inner pole tube can be made of aluminum, for example, so that a particularly low weight of the magnet assembly is achieved.
  • the non-magnetic intermediate element in the direction of the longitudinal axis of the magnet armature has a tapering towards the magnet armature cross-section.
  • solder material thus causes the connection and sealing in the region of the partition wall between the inner pole tube and the outer pole tube, and moreover has the advantage that it adapts particularly well when present component tolerances in its application by its temporary liquefaction.
  • a structural design of the magnet assembly is particularly preferred in which the outer pole tube forms part of the receiving space for the magnet armature, and that the pole tube housing is at least partially encapsulated by plastic on the side remote from the magnet armature, which at the same time forms a connector connection region.
  • Such a design has the advantage that no separate housing part has to be provided for the radial sheathing of the magnet assembly, but that this function is primarily fulfilled by the outer pole tube.
  • it is possible to form a fuel injector which is particularly compact in terms of diameter and, moreover, can be produced in a particularly simple and cost-effective manner due to the reduced number of components (lack of external housing in this area).
  • the invention also encompasses a method for producing a magnet assembly according to the invention, wherein a non-magnetic intermediate element is arranged between an inner pole tube and an outer pole tube in a partition wall.
  • the dividing wall is machined, at least in the region of the nonmagnetic intermediate element, by a cutting material removal.
  • a one-piece component is used to form the inner pole tube and the outer pole tube, that in the region of the partition in an end face of Component is formed at least one radially encircling annular groove, that the at least one annular groove is filled with solder material, and that then at least on the at least one annular groove opposite end of the component material removal takes place, such that the material of the component into the region of the solder Will get removed.
  • Such a design has the particular advantage that a positioning of the intendpolrohrs to mecanicpolrohr is not required, since the two components are realized by a one-piece component, which is processed only in the course of the manufacturing process by the cutting material removal such that from the one-piece component the two outer pole tube and the inner pole tube forming areas arise.
  • the invention also includes a fuel injector using a magnet assembly according to the invention.
  • a fuel injector has the advantage that it does not require high requirements with respect to its magnetic coil, in particular that it can be used even at relatively high system pressures or fuel temperatures, the magnet assembly, despite the use of a relatively small magnetic coil, the required forces for actuating the magnet armature applies.
  • a fuel injector 100 is shown in some areas, as it is used as part of a common rail injection system in a self-igniting internal combustion engine.
  • a fuel injector 100 is designed, for example, to a system pressure of 1800 bar and more.
  • a switching valve with a magnet assembly 10 which serves for actuating a magnet armature 11 designed as a flat armature.
  • the armature 11 is arranged in a pressure chamber 12 filled with fuel and connected to a pin-shaped valve element 13, which regulates a fuel drain from a control chamber, not shown in the figures.
  • valve element 13 is accommodated radially inside a valve housing 14, which has a stepped receiving bore 15 for receiving an outer pole tube 16.
  • the outer pole tube 16 is part of a Polrohrgepuruses 19 and hydraulically sealed received in the receiving bore 15 via a arranged in an annular groove 17 sealing ring 18 and axially clamped by means of a union nut 20 with the valve housing 14.
  • the magnetic pole outer pole tube 16 has a ring-shaped and concentric with the longitudinal axis 21 of the fuel injector 100 and the armature 11 arranged first wall portion 22 in which the annular groove 17 is formed. At the first portion 22 is followed on the side facing away from the valve housing 14 on a radially inwardly projecting, perpendicular to the longitudinal axis 21 arranged wall portion 23 at. On the side opposite the wall portion 23 of the first portion 22, a concentric with the longitudinal axis 21 arranged, annular second section 24 connects. The pressure chamber 12 is bounded radially by the first wall section 22 of the outer pole tube 16.
  • the magnet assembly 10 Concentric with the outer pole tube 16, the magnet assembly 10 has an inner pole tube 25 made of magnetic material.
  • the substantially sleeve-shaped mecanicpolrohr 25 has a through hole 26 for receiving a compression spring 27, which is axially indirectly supported on a step 28 of the through hole 26 and the armature 11 in the direction of the valve housing 12 subjected to force.
  • the through hole 26 opens into a return pipe 29 which is connectable to the low pressure region of the fuel system. About the through hole 26 and the return pipe 29 can flow out of the control chamber fuel flowing, which is located within the pressure chamber 12, via at least one formed in the armature 11 hole 30.
  • the inner pole tube 25 On the side facing the valve housing 14, the inner pole tube 25 has a radially outwardly projecting wall section 31, which is located at the same axial height as the wall section 23 of the outer pole tube 16, wherein both wall sections 23, 31 have the same thickness. Between the two wall sections 23, 31, an annular intermediate region 32 is formed, which consists of non-magnetic material, in particular non-magnetic solder consists.
  • the cross section of the intermediate region 32 is V-shaped or has two conically arranged side surfaces, such that the width of the intermediate region 32 decreases in the direction of the magnet armature 11.
  • the two wall sections 23, 31 form, together with the intermediate region 32, a closed partition wall 35, which forms an axial boundary of the pressure chamber 12.
  • annular receiving space 36 On the opposite side of the pressure chamber 12 of the partition wall 35 of the outer pole tube 16 and the inner pole tube 25, an annular receiving space 36 is formed.
  • a likewise annular magnetic core 37 is arranged, which has an annular groove-like opening 38 for receiving a magnetic coil 40 on the side facing the partition wall 35.
  • the magnet coil 40 is connected via contact pins 41 (in the illustration of FIG Fig. 1 only a single contact pin 41 can be seen) connected to plug lugs 42 for the electrical control of the solenoid coil 40, which is arranged in a plastic connector connection portion 43.
  • a partial longitudinal section of the magnet assembly 10 in the region of the partition 35 is shown enlarged.
  • the nonmagnetic intermediate region 32 is arranged in alignment with and overlapping the end face 44 of the magnet coil 40 and has the same ring width on the side facing the magnet coil 40 as the magnet coil 40.
  • the lines 45 indicate the flux of the magnetic field lines in the magnet assembly 10 shown. It can be seen that both the inner pole tube 25 and the outer pole tube 16 are penetrated by the lines 45, that is, that both are part of the magnetic circuit. In particular, it can be seen that the lines 45 on the side facing the magnet armature 11 are deflected by the two wall sections 23, 31.
  • Fig. 3 is one opposite the Fig. 1 modified magnetic assembly 10a shown.
  • the wall portion 23a of the Jardinpolrohrs 16a formed in its radial extent reduced in size, and the inner pole tube 25a has no radially outwardly projecting portion at the level of the wall portion 23a.
  • both the outer pole tube 16a and the inner pole tube 25a are made of non-magnetic material such as aluminum.
  • the partition wall 35 is formed by two annular, consisting of magnetic material, in particular of magnetic solder material pole body 46, 47, between which the non-magnetic material existing intermediate region 32a is arranged.
  • the two pole bodies 46, 47 assume the function of the (magnetic) wall sections 23, 31 of the magnet assembly 10.
  • the magnet assembly 10 can be manufactured particularly easy to produce if, according to the representation of Fig. 4 an initially integrally formed member 50 is used, which consists of magnetically active material, and the outer pole tube 16 and the mecanicpolrohr 25 forms after the now described finishing.
  • a V-shaped annular groove 52 is formed in a horizontally encircling annular wall region 51 on the side facing the receiving space 36, into which the (non-magnetic) solder material forming the intermediate region 32 is subsequently introduced.
  • the wall region 51 is machined from both sides by machining material (in particular grinding), whereby the wall thickness of the wall region 51 is reduced and at the same time flat end faces 53, 54 are formed.
  • the intermediate region 32 forms a part of the end faces 53, 54.
  • the magnetic assemblies 10, 10a or the fuel injector 100 described so far can be modified or modified in many ways without deviating from the inventive concept.
  • the magnetic assembly 10a with the in the 4 and 5 to manufacture then, for which purpose a plurality of annular grooves are formed, which are filled with the material of the intermediate region 32a and the pole body 46, 47.

Abstract

The magnet assembly (10) has a magnet armature (11) which is arranged between inner and outer pipes (25,16). A partition wall (35) is arranged on the side facing the armature, vertically to the longitudinal axis (21) of the armature. A V-shaped non-magnetic intermediate portion (32) is formed between wall sections (23,31) or magnetic effective polar structures, and arranged in the region of partition wall so as to overlap with the front end of the magnetic coil (40). A hydraulic seal is formed between a pressure chamber (12) and a magnetic coil receiving space (36). An independent claim is included for method for manufacturing magnet assembly.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Magnetbaugruppe für einen Kraftstoffinjektor nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung ein Verfahren zum Herstellen einer erfindungsgemäßen Magnetbaugruppe sowie einen Kraftstoffinjektor unter Verwendung einer erfindungsgemäßen Magnetbaugruppe.The invention relates to a magnet assembly for a fuel injector according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a magnet assembly according to the invention and a fuel injector using a magnet assembly according to the invention.

Eine Magnetbaugruppe nach dem Oberbegriff des Anspruchs 1 ist aus der DE 10 2010 001 486 A1 der Anmelderin bekannt. Mittels der bekannten Magnetbaugruppe wird in einem Kraftstoffinjektor der Kraftstoffabfluss aus einem Steuerraum beeinflusst, wodurch eine Hubbewegung einer Düsennadel gesteuert wird. Hierzu ist eine Magnetspule in einem Magnetkern eingesetzt, die an einer Stirnseite in Überdeckung mit einem Magnetanker angeordnet sind. Bei einer Bestromung der Magnetspule wird der Magnetanker in Richtung der Magnetspule gezogen, so dass der Magnetanker auf der der Magnetspule gegenüberliegenden Seite einen Dichtsitz freigibt, über den Kraftstoff aus dem angesprochenen Steuerraum abfließen kann. Nachteilig dabei ist, dass sowohl der Magnetanker als auch die Magnetspule und der Magnetkern in einem Teilbereich des Kraftstoffinjektors angeordnet sind, in dem sich der Kraftstoff befindet. Der Kraftstoff gelangt somit in Kontakt insbesondere mit der Magnetspule, so dass diese besonders ausgebildet sein muss. Problematisch sind dabei insbesondere relativ hohe Temperaturen des Kraftstoffs, die bei einem Systemdruck von beispielsweise 2000bar bis zu 190°C betragen können. Darüber hinaus ist die Abdichtung des Spulenkörpers bzw. dessen Anschlusspins in Richtung der elektrischen Anschlüsse zur Ansteuerung der Magnetbaugruppe kritisch. Man könnte nun zwar versuchen, durch ein entsprechendes Trennelement die Magnetspule von dem Magnetanker hydraulisch zu trennen, der dadurch vergrößerte axiale Abstand zwischen der Magnetspule und dem Magnetkern senkt jedoch den Wirkungsgrad der Magnetbaugruppe bzw. macht es erforderlich, eine größere Magnetspule zur Erzielung einer bestimmten Magnetkraft zu verwenden, was wiederum eine Reihe von Nachteilen, insbesondere bezüglich des Bauraums und der Herstellkosten der Magnetbaugruppe, nach sich zieht.A magnet assembly according to the preamble of claim 1 is known from DE 10 2010 001 486 A1 the applicant known. By means of the known magnet assembly, the fuel discharge from a control chamber is influenced in a fuel injector, whereby a stroke movement of a nozzle needle is controlled. For this purpose, a magnetic coil is inserted in a magnetic core, which are arranged on a front side in registration with a magnet armature. When the magnet coil is energized, the magnet armature is pulled in the direction of the magnet coil so that the magnet armature releases a sealing seat on the side opposite the magnet coil, via which fuel can flow out of the addressed control chamber. The disadvantage here is that both the armature and the magnetic coil and the magnetic core are arranged in a portion of the fuel injector, in which the fuel is located. The fuel thus comes into contact in particular with the magnetic coil, so that it must be specially designed. In particular, relatively high temperatures of the fuel, which may be up to 190 ° C. at a system pressure of, for example, 2000 bar, are a problem. In addition, the sealing of the bobbin or its connection pins in the direction of the electrical connections for controlling the Magnetic module critical. Although one could try to hydraulically separate by a corresponding separator, the magnetic coil of the armature, however, the increased axial distance between the magnetic coil and the magnetic core, however, lowers the efficiency of the magnet assembly or makes it necessary to use a larger solenoid coil to achieve a certain magnetic force in turn, which in turn entails a number of disadvantages, in particular with regard to the installation space and the manufacturing costs of the magnet assembly.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Magnetbaugruppe für einen Kraftstoffinjektor nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass neben der hydraulischen Trennung zwischen dem Bereich, in dem Magnetanker angeordnet ist von dem Bereich, in dem sich die Magnetspule und der Magnetkern befinden, selbst bei Verwendung relativ kleiner bzw. schwacher Magnetspulen eine relativ hohe magnetische Kraft auf dem Magnetanker erzielt werden kann. Diese Aufgabe wird erfindungsgemäß bei einer Magnetbaugruppe für einen Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 dadurch gelöst, dass der Magnetkern und die Magnetspule in einem Polrohrgehäuse aufgenommen sind, das aus einem Innenpolrohr und einem Außenpolrohr besteht, die konzentrisch zueinander angeordnet sind, wobei zwischen dem Innenpolrohr und dem Außenpolrohr auf der dem Magnetanker zugewandten Seite eine vorzugsweise senkrecht zur Längsachse des Magnetankers angeordnete Trennwand ausgebildet ist, in der in zumindest teilweiser Überdeckung mit der Stirnseite der Magnetspule ein nichtmagnetisches Zwischenelement angeordnet ist, wobei das Polrohrgehäuse im Bereich der Trennwand in zumindest teilweiser Überdeckung mit dem Magnetkern wenigstens einen magnetisch wirksamen Wandabschnitt oder wenigstens einen magnetisch wirksamen Polkörper aufweist, und wobei die Trennwand eine hydraulische Abdichtung zwischen einem Druckraum für den Magnetanker und einem Aufnahmeraum für die Magnetspule und den Magnetkern ausbildet. Die Erfindung ermöglicht es somit, einerseits eine hydraulische Trennung zwischen dem kraftstoffführenden Bereich, in dem sich der Magnetanker befindet von dem Bereich der Magnetspule und dem Magnetkern auszubilden, und andererseits durch einen magnetisch ausgebildeten Bereich, der in Überdeckung mit der Stirnseite der Magnetspule auf der dem Magnetanker zugewandten Seite angeordnet ist, den Magnetfluss derart zu beeinflussen, dass die Magnetfeldlinien über den magnetisch wirksamen Bereich der Trennwand geführt werden, wodurch sich die magnetische Feldstärke erhöht und somit eine erhöhte Magnetkraft auf den Magnetanker erzielen lässt. Dadurch lässt sich trotz des im Vergleich zum Stand der Technik vergrößerten axialen Abstands zwischen der Stirnseite der Magnetspule und dem Magnetanker auf den Magnetanker eine genügend hohe Magnetkraft erzielen, die es ermöglicht, beispielsweise eine Magnetspule derselben Baugröße zu verwenden wie beim Stand der Technik.Based on the illustrated prior art, the present invention seeks to develop a magnetic assembly for a fuel injector according to the preamble of claim 1 such that in addition to the hydraulic separation between the area is arranged in the armature of the area in which the Magnetic coil and the magnetic core are, even when using relatively small or weak magnetic coils, a relatively high magnetic force can be achieved on the armature. This object is achieved with a magnetic assembly for a fuel injector with the features of claim 1, characterized in that the magnetic core and the magnetic coil are accommodated in a pole tube housing, which consists of a Innenpolrohr and a Außenpolrohr, which are arranged concentrically to each other, wherein between the inner pole tube and the outer pole tube on the magnet armature side facing a preferably arranged perpendicular to the longitudinal axis of the magnet armature partition is formed in which in at least partial overlap with the end face of the magnetic coil, a non-magnetic intermediate element is arranged, wherein the pole tube housing in the region of the partition in at least partial coverage with the magnetic core has at least one magnetically active wall section or at least one magnetically active pole body, and wherein the partition wall, a hydraulic seal between a pressure chamber for the armature and a recording eraum for the magnetic coil and the magnetic core is formed. The invention thus makes it possible on the one hand, a hydraulic separation between the fuel-carrying region in which the magnet armature is located from the region of the magnetic coil and the Form magnetic core, and on the other hand by a magnetically formed region which is arranged in register with the end face of the magnetic coil on the side facing the magnet armature, to influence the magnetic flux such that the magnetic field lines are guided over the magnetically active region of the partition wall, whereby the increases magnetic field strength and thus can achieve an increased magnetic force on the armature. As a result, despite the increased axial distance between the end face of the magnetic coil and the magnet armature on the magnet armature in comparison to the prior art, a sufficiently high magnetic force can be achieved, which makes it possible, for example, to use a magnet coil of the same size as in the prior art.

Vorteilhafte Weiterbildungen der erfindungsgemäßen Magnetbaugruppe sind in den Unteransprüchen aufgeführt.Advantageous developments of the magnetic assembly according to the invention are listed in the subclaims.

In einer ersten konstruktiven Ausbildung des magnetisch wirksamen Bereichs im Bereich der Trennwand wird vorgeschlagen, dass das Innenpolrohr und das Außenpolrohr aus magnetischem Material bestehen. Unter einem magnetischen Material wird dabei insbesondere ein ferromagnetisches Material verstanden, das durch entsprechende Magnetisierung die gewünschten magnetischen Eigenschaften aufweist. Eine derartige Ausbildung hat den Vorteil, dass zwischen den einander anschließenden radialen Bereichen des Innenpolrohrs und des Außenpolrohrs im Bereich der Trennwand lediglich ein nichtmagnetisches Zwischenelement angeordnet werden muss. Dadurch lässt sich die Anzahl der Bauelemente bzw. Bauteile zur Aufnahme der Magnetspule und des Magnetkerns reduzieren.In a first structural design of the magnetically active region in the region of the partition wall, it is proposed that the inner pole tube and the outer pole tube consist of magnetic material. By a magnetic material is meant in particular a ferromagnetic material which has the desired magnetic properties by appropriate magnetization. Such a design has the advantage that only one non-magnetic intermediate element has to be arranged between the adjoining radial regions of the inner pole tube and the outer pole tube in the region of the dividing wall. As a result, the number of components or components for receiving the magnetic coil and the magnetic core can be reduced.

In alternativer konstruktiver Ausgestaltung wird vorgeschlagen, dass das Innenpolrohr und das Außenpolrohr aus unmagnetischem Material bestehen, und dass das Innenpolrohr und das Außenpolrohr im Bereich der Trennwand mit zwei magnetischen Ringkörpern verbunden sind, zwischen denen das nichtmagnetische Zwischenelement angeordnet ist. Eine derartige Ausbildung hat den Vorteil, dass das Außenpolrohr und das Innenpolrohr beispielsweise aus Aluminium bestehen können, so dass ein besonders geringes Gewicht der Magnetbaugruppe erzielt wird.In an alternative constructive embodiment, it is proposed that the inner pole tube and the outer pole tube consist of nonmagnetic material, and that the inner pole tube and the outer pole tube are connected in the region of the dividing wall with two magnetic ring bodies, between which the nonmagnetic intermediate element is arranged. Such a design has the advantage that the outer pole tube and the inner pole tube can be made of aluminum, for example, so that a particularly low weight of the magnet assembly is achieved.

Zur Optimierung der magnetischen Feldstärke bzw. zur Orientierung/Umlenkung der magnetischen Feldlinien ist es vorgesehen, dass das nichtmagnetische Zwischenelement in Richtung der Längsachse des Magnetankers einen sich zum Magnetanker hin verjüngenden Querschnitt aufweist.To optimize the magnetic field strength or for orientation / deflection of the magnetic field lines, it is provided that the non-magnetic intermediate element in the direction of the longitudinal axis of the magnet armature has a tapering towards the magnet armature cross-section.

In einer besonders bevorzugten Ausgestaltung des nichtmagnetischen Zwischenelements wird vorgeschlagen, dass dieses aus Lotmaterial besteht. Das Lotmaterial bewirkt somit die Verbindung und Abdichtung im Bereich der Trennwand zwischen dem Innenpolrohr und dem Außenpolrohr, und hat darüber hinaus den Vorteil, dass es sich bei seiner Anwendung durch seiner zeitweise Verflüssigung besonders gut ggf. vorhandenen Bauteiletoleranzen anpasst.In a particularly preferred embodiment of the non-magnetic intermediate element, it is proposed that this consists of solder material. The solder material thus causes the connection and sealing in the region of the partition wall between the inner pole tube and the outer pole tube, and moreover has the advantage that it adapts particularly well when present component tolerances in its application by its temporary liquefaction.

Besonders bevorzugt ist darüber hinaus eine konstruktive Ausgestaltung der Magnetbaugruppe, bei der das Außenpolrohr einen Teil des Aufnahmeraums für den Magnetanker ausbildet, und dass das Polrohrgehäuse auf der dem Magnetanker abgewandten Seite zumindest bereichsweise von Kunststoff umspritzt ist, der gleichzeitig einen Steckeranschlussbereich ausbildet. Eine derartige Ausbildung hat den Vorteil, dass kein separates Gehäuseteil zur radialen Ummantelung der Magnetbaugruppe vorgesehen werden muss, sondern dass diese Funktion primär von dem Außenpolrohr erfüllt wird. Dadurch lässt sich ein insbesondere bezüglich des Durchmessers besonders kompakter Kraftstoffinjektor ausbilden, der sich darüber hinaus aufgrund der reduzierten Bauteileanzahl (fehlendes Außengehäuse in diesem Bereich) besonders einfach und kostengünstig herstellen lässt.In addition, a structural design of the magnet assembly is particularly preferred in which the outer pole tube forms part of the receiving space for the magnet armature, and that the pole tube housing is at least partially encapsulated by plastic on the side remote from the magnet armature, which at the same time forms a connector connection region. Such a design has the advantage that no separate housing part has to be provided for the radial sheathing of the magnet assembly, but that this function is primarily fulfilled by the outer pole tube. As a result, it is possible to form a fuel injector which is particularly compact in terms of diameter and, moreover, can be produced in a particularly simple and cost-effective manner due to the reduced number of components (lack of external housing in this area).

Die Erfindung umfasst auch ein Verfahren zum Herstellen einer erfindungsgemäßen Magnetbaugruppe, wobei zwischen einem Innenpolrohr und einem Außenpolrohr in einer Trennwand ein nicht magnetisches Zwischenelement angeordnet wird. Erfindungsgemäß ist es vorgesehen, dass die Trennwand zumindest im Bereich des nichtmagnetischen Zwischenelements durch einen spanenden Materialabtrag bearbeitet wird. Eine derartige Ausbildung ermöglicht es unter Verwendung eines Lotmaterials fertigungstechnisch bedingte Unebenheiten der Oberfläche an den beiden Stirnseiten (auf der der Magnetspule sowie auf der dem Magnetanker zugewandten Seite) besonders einfach auszugleichen und plane Oberflächen zu realisieren.The invention also encompasses a method for producing a magnet assembly according to the invention, wherein a non-magnetic intermediate element is arranged between an inner pole tube and an outer pole tube in a partition wall. According to the invention, it is provided that the dividing wall is machined, at least in the region of the nonmagnetic intermediate element, by a cutting material removal. Such a design makes it possible using a solder material production-related unevenness of the surface at the two end faces (on the magnetic coil and on the magnet armature side facing) particularly easy to compensate and to realize flat surfaces.

In einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens, das die Verwendung von nichtmagnetischen Bauteilen für das Außenpolrohr und das Innenpolrohr ermöglicht, wird vorgeschlagen, dass zwischen dem Außenpolrohr und dem Innenpolrohr jeweils aus magnetischem Lot bestehende Ringkörper ausgebildet werden, zwischen denen das aus nicht magnetischem Lot bestehende Zwischenelement angeordnet ist.In a further embodiment of the method according to the invention, which enables the use of non-magnetic components for the outer pole tube and the inner pole tube, it is proposed that between the outer pole tube and the inner pole tube each consisting of magnetic solder ring body are formed, between which the existing non-magnetic solder intermediate element is arranged.

Um das Lot an den gewünschten (kreis- bzw. ringförmigen) Bereichen anzuordnen und gleichzeitig einen besonders vorteilhaften Herstellungsprozess vorzuschlagen, ist es vorgesehen, dass zur Ausbildung des Innenpolrohrs und des Außenpolrohrs ein einstückiges Bauteil verwendet wird, dass im Bereich der Trennwand in eine Stirnseite des Bauteils wenigstens eine radial umlaufende Ringnut ausgebildet wird, dass die wenigstens eine Ringnut mit Lotmaterial ausgefüllt wird, und dass anschließend zumindest auf der der wenigstens einen Ringnut gegenüberliegenden Stirnseite des Bauteils ein Materialabtrag erfolgt, derart, dass das Material des Bauteils bis in den Bereich des Lots entfernt wird. Eine derartige Ausbildung hat insbesondere den Vorteil, dass eine Positionierung des Außenpolrohrs zu dem Innenpolrohr nicht erforderlich ist, da die beiden Bauteile durch ein einstückiges Bauteil realisiert werden, welches erst im Laufe des Fertigungsprozesses durch den spanenden Materialabtrag derart bearbeitet wird, dass aus dem einstückigen Bauteil die beiden das Außenpolrohr und das Innenpolrohr bildenden Bereiche entstehen.In order to arrange the solder at the desired (circular or annular) areas and at the same time to propose a particularly advantageous production process, it is provided that a one-piece component is used to form the inner pole tube and the outer pole tube, that in the region of the partition in an end face of Component is formed at least one radially encircling annular groove, that the at least one annular groove is filled with solder material, and that then at least on the at least one annular groove opposite end of the component material removal takes place, such that the material of the component into the region of the solder Will get removed. Such a design has the particular advantage that a positioning of the Außenpolrohrs to Innenpolrohr is not required, since the two components are realized by a one-piece component, which is processed only in the course of the manufacturing process by the cutting material removal such that from the one-piece component the two outer pole tube and the inner pole tube forming areas arise.

Die Erfindung umfasst auch einen Kraftstoffinjektor unter Verwendung einer erfindungsgemäßen Magnetbaugruppe. Ein derartiger Kraftstoffinjektor hat den Vorteil, dass er bezüglich seiner Magnetspule keine hohen Anforderungen benötigt, insbesondere, dass er auch bei relativ hohen Systemdrücken bzw. Kraftstofftemperaturen einsetzbar ist, wobei die Magnetbaugruppe trotz der Verwendung einer relativ klein bauenden Magnetspule die benötigten Kräfte zur Betätigung des Magnetankers aufbringt.The invention also includes a fuel injector using a magnet assembly according to the invention. Such a fuel injector has the advantage that it does not require high requirements with respect to its magnetic coil, in particular that it can be used even at relatively high system pressures or fuel temperatures, the magnet assembly, despite the use of a relatively small magnetic coil, the required forces for actuating the magnet armature applies.

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:

Fig. 1
einen Teilbereich eines Kraftstoffinjektors unter Verwendung einer ersten erfindungsgemäßen Magnetbaugruppe in einem Längsschnitt,
Fig. 2
einen Teillängsschnitt im Bereich einer erfindungsgemäßen Magnetbaugruppe,
Fig. 3
eine gegenüber der Fig. 1 abgewandelte Magnetbaugruppe unter Verwendung eines nicht magnetischen Außenpolrohrs und eines nichtmagnetischen Innenpolrohrs, ebenfalls im Längsschnitt und
Fig. 4 und Fig. 5
jeweils Teillängsschnitte zur Verdeutlichung eines möglichen Herstellungsverfahrens der Magnetbaugruppe gemäß Fig. 1 im Bereich einer Trennwand zwischen der Magnetspule und einem Magnetanker.
This shows in:
Fig. 1
a portion of a fuel injector using a first magnetic assembly according to the invention in a longitudinal section,
Fig. 2
a partial longitudinal section in the range of a magnet assembly according to the invention,
Fig. 3
one opposite the Fig. 1 modified magnetic assembly using a non-magnetic Außenpolrohrs and a non-magnetic Innenpolrohrs, also in longitudinal section and
4 and FIG. 5
each partial longitudinal sections to illustrate a possible manufacturing method of the magnetic assembly according to Fig. 1 in the region of a partition wall between the magnet coil and a magnet armature.

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 bereichsweise ein Kraftstoffinjektor 100 dargestellt, wie er als Bestandteil eines Common-Rail-Einspritzsystems in einer selbstzündenden Brennkraftmaschine verwendet wird. Ein derartiger Kraftstoffinjektor 100 ist beispielsweise auf einen Systemdruck von 1800bar und mehr ausgelegt.In the Fig. 1 a fuel injector 100 is shown in some areas, as it is used as part of a common rail injection system in a self-igniting internal combustion engine. Such a fuel injector 100 is designed, for example, to a system pressure of 1800 bar and more.

Innerhalb des Kraftstoffinjektors 100 ist ein Schaltventil mit einer erfindungsgemäßen Magnetbaugruppe 10 angeordnet, die zum Betätigen eines als Flachanker ausgebildeten Magnetankers 11 dient. Der Magnetanker 11 ist in einem mit Kraftstoff befüllten Druckraum 12 angeordnet und mit einem stiftförmigen Ventilelement 13 verbunden, das einen Kraftstoffabfluss aus einem in den Figuren nicht dargestellten Steuerraum regelt. Über die Beeinflussung des Kraftstoffabflusses des Steuerraums lässt sich in bekannter Art und Weise die Bewegung einer Düsennadel beeinflussen, die in dem Kraftstoffinjektor 100 ausgebildete Einspritzöffnungen öffnet bzw. verschließt.Within the fuel injector 100, a switching valve with a magnet assembly 10 according to the invention is arranged, which serves for actuating a magnet armature 11 designed as a flat armature. The armature 11 is arranged in a pressure chamber 12 filled with fuel and connected to a pin-shaped valve element 13, which regulates a fuel drain from a control chamber, not shown in the figures. By influencing the fuel outflow of the control chamber, the movement of a nozzle needle which opens or closes injection openings formed in the fuel injector 100 can be influenced in a known manner.

Das Ventilelement 13 ist radial innerhalb eines Ventilgehäuses 14 aufgenommen, das eine stufenartige Aufnahmebohrung 15 zur Aufnahme eines Außenpolrohrs 16 aufweist. Das Außenpolrohr 16 ist Bestandteil eines Polrohrgehäuses 19 und über einen in einer Ringnut 17 angeordneten Dichtring 18 in der Aufnahmebohrung 15 hydraulisch abgedichtet aufgenommen und mittels einer Überwurfmutter 20 mit dem Ventilgehäuse 14 axial verspannt.The valve element 13 is accommodated radially inside a valve housing 14, which has a stepped receiving bore 15 for receiving an outer pole tube 16. The outer pole tube 16 is part of a Polrohrgehäuses 19 and hydraulically sealed received in the receiving bore 15 via a arranged in an annular groove 17 sealing ring 18 and axially clamped by means of a union nut 20 with the valve housing 14.

Das aus magnetischem Material bestehende Außenpolrohr 16 weist einen ringförmig ausgebildeten und konzentrisch zur Längsachse 21 des Kraftstoffinjektors 100 bzw. des Magnetankers 11 angeordneten ersten Wandabschnitt 22 auf, in dem auch die Ringnut 17 ausgebildet ist. An den ersten Abschnitt 22 schließt sich auf der dem Ventilgehäuse 14 abgewandten Seite ein radial nach innen ragender, senkrecht zur Längsachse 21 angeordneter Wandabschnitt 23 an. Auf der dem Wandabschnitt 23 gegenüberliegenden Seite des ersten Abschnitts 22 schließt sich ein konzentrisch zur Längsachse 21 angeordneter, ringförmiger zweiter Abschnitt 24 an. Der Druckraum 12 ist radial von dem ersten Wandabschnitt 22 des Außenpolrohrs 16 begrenzt.The magnetic pole outer pole tube 16 has a ring-shaped and concentric with the longitudinal axis 21 of the fuel injector 100 and the armature 11 arranged first wall portion 22 in which the annular groove 17 is formed. At the first portion 22 is followed on the side facing away from the valve housing 14 on a radially inwardly projecting, perpendicular to the longitudinal axis 21 arranged wall portion 23 at. On the side opposite the wall portion 23 of the first portion 22, a concentric with the longitudinal axis 21 arranged, annular second section 24 connects. The pressure chamber 12 is bounded radially by the first wall section 22 of the outer pole tube 16.

Konzentrisch zum Außenpolrohr 16 weist die Magnetbaugruppe 10 ein aus magnetischem Material bestehendes Innenpolrohr 25 auf. Das im wesentlichen hülsenförmig ausgebildete Innenpolrohr 25 weist eine Durchgangsbohrung 26 zur Aufnahme einer Druckfeder 27 auf, die sich mittelbar an einer Stufe 28 der Durchgangsbohrung 26 axial abstützt und den Magnetanker 11 in Richtung des Ventilgehäuses 12 kraftbeaufschlagt. Die Durchgangsbohrung 26 mündet in einen Rücklaufstutzen 29, der mit dem Niederdruckbereich des Kraftstoffsystems verbindbar ist. Über die Durchgangsbohrung 26 sowie den Rücklaufstutzen 29 kann aus dem Steuerraum ausströmender Kraftstoff, der sich innerhalb des Druckraums 12 befindet, über wenigstens eine in dem Magnetanker 11 ausgebildete Bohrung 30 abströmen.Concentric with the outer pole tube 16, the magnet assembly 10 has an inner pole tube 25 made of magnetic material. The substantially sleeve-shaped Innenpolrohr 25 has a through hole 26 for receiving a compression spring 27, which is axially indirectly supported on a step 28 of the through hole 26 and the armature 11 in the direction of the valve housing 12 subjected to force. The through hole 26 opens into a return pipe 29 which is connectable to the low pressure region of the fuel system. About the through hole 26 and the return pipe 29 can flow out of the control chamber fuel flowing, which is located within the pressure chamber 12, via at least one formed in the armature 11 hole 30.

Auf der dem Ventilgehäuse 14 zugewandten Seite weist das Innenpolrohr 25 einen radial nach außen ragenden Wandabschnitt 31 auf, der sich in gleicher axialer Höhe wie der Wandabschnitt 23 des Außenpolrohrs 16 befindet, wobei beide Wandabschnitte 23, 31 dieselbe Dicke aufweisen. Zwischen den beiden Wandabschnitten 23, 31 ist ein ringförmiger Zwischenbereich 32 ausgebildet, der aus nichtmagnetischem Material, insbesondere aus nichtmagnetischem Lot besteht. Der Querschnitt des Zwischenbereichs 32 ist V-förmig bzw. weist zwei konisch zueinander angeordnete Seitenflächen auf, derart, dass die Breite des Zwischenbereichs 32 in Richtung zum Magnetanker 11 hin abnimmt. Die beiden Wandabschnitte 23, 31 bilden zusammen mit dem Zwischenbereich 32 eine geschlossene Trennwand 35 aus, die eine axiale Begrenzung des Druckraums 12 bildet.On the side facing the valve housing 14, the inner pole tube 25 has a radially outwardly projecting wall section 31, which is located at the same axial height as the wall section 23 of the outer pole tube 16, wherein both wall sections 23, 31 have the same thickness. Between the two wall sections 23, 31, an annular intermediate region 32 is formed, which consists of non-magnetic material, in particular non-magnetic solder consists. The cross section of the intermediate region 32 is V-shaped or has two conically arranged side surfaces, such that the width of the intermediate region 32 decreases in the direction of the magnet armature 11. The two wall sections 23, 31 form, together with the intermediate region 32, a closed partition wall 35, which forms an axial boundary of the pressure chamber 12.

Auf der dem Druckraum 12 gegenüberliegenden Seite der Trennwand 35 wird von dem Außenpolrohr 16 und dem Innenpolrohr 25 ein ringförmiger Aufnahmeraum 36 ausgebildet. In dem Aufnahmeraum 36 ist ein ebenfalls ringförmiger Magnetkern 37 angeordnet, der auf der der Trennwand 35 zugewandten Seite eine ringnutartige Öffnung 38 zur Aufnahme einer Magnetspule 40 aufweist. Die Magnetspule 40 ist über Kontaktpins 41 (wobei in der Darstellung der Fig. 1 lediglich ein einziger Kontaktpin 41 erkennbar ist) mit Steckerfahnen 42 zur elektrischen Ansteuerung der Magnetspule 40 verbunden, die in einem aus Kunststoff bestehenden Steckeranschlussbereich 43 angeordnet ist. Darüber hinaus sind ein axialer Teilbereich des Magnetkerns 37, das Innenpolrohr 25, der Rücklaufstutzen 29 sowie der obere axiale Endbereich des zweiten Abschnitts 24 des Außenpolrohrs 16 vom Kunststoff des Steckeranschlussbereichs 43 umgeben, der somit einen Teil des Gehäuses des Kraftstoffinjektors 100 ausbildet.On the opposite side of the pressure chamber 12 of the partition wall 35 of the outer pole tube 16 and the inner pole tube 25, an annular receiving space 36 is formed. In the receiving space 36, a likewise annular magnetic core 37 is arranged, which has an annular groove-like opening 38 for receiving a magnetic coil 40 on the side facing the partition wall 35. The magnet coil 40 is connected via contact pins 41 (in the illustration of FIG Fig. 1 only a single contact pin 41 can be seen) connected to plug lugs 42 for the electrical control of the solenoid coil 40, which is arranged in a plastic connector connection portion 43. In addition, an axial portion of the magnetic core 37, the Innenpolrohr 25, the return port 29 and the upper axial end portion of the second portion 24 of the Außenpolrohrs 16 surrounded by plastic of the male connection portion 43, which thus forms part of the housing of the fuel injector 100.

In der Fig. 2 ist ein Teillängsschnitt der Magnetbaugruppe 10 im Bereich der Trennwand 35 vergrößert dargestellt. Insbesondere erkennt man, dass der nichtmagnetische Zwischenbereich 32 fluchtend und in Überdeckung zur Stirnseite 44 der Magnetspule 40 angeordnet ist und auf der der Magnetspule 40 zugewandten Seite dieselbe Ringbreite aufweist wie die Magnetspule 40. Durch die Linien 45 ist der Fluss der Magnetfeldlinien in der Magnetbaugruppe 10 dargestellt. Man erkennt, dass sowohl das Innenpolrohr 25 als auch das Außenpolrohr 16 von den Linien 45 durchsetzt ist, d.h., dass beide Bestandteil des Magnetkreises sind. Insbesondere erkennt man, dass die Linien 45 auf der dem Magnetanker 11 zugewandten Seite durch die beiden Wandabschnitte 23, 31 umgelenkt werden.In the Fig. 2 a partial longitudinal section of the magnet assembly 10 in the region of the partition 35 is shown enlarged. In particular, it can be seen that the nonmagnetic intermediate region 32 is arranged in alignment with and overlapping the end face 44 of the magnet coil 40 and has the same ring width on the side facing the magnet coil 40 as the magnet coil 40. The lines 45 indicate the flux of the magnetic field lines in the magnet assembly 10 shown. It can be seen that both the inner pole tube 25 and the outer pole tube 16 are penetrated by the lines 45, that is, that both are part of the magnetic circuit. In particular, it can be seen that the lines 45 on the side facing the magnet armature 11 are deflected by the two wall sections 23, 31.

In der Fig. 3 ist eine gegenüber der Fig. 1 abgewandelte Magnetbaugruppe 10a dargestellt. Bei der Magnetbaugruppe 10a ist der Wandabschnitt 23a des Außenpolrohrs 16a in seiner radialer Erstreckung verkleinert ausgebildet, und das Innenpolrohr 25a weist keinen radial nach außen ragenden Abschnitt in Höhe des Wandabschnitts 23a aus. Darüber hinaus bestehen sowohl das Außenpolrohr 16a als auch das Innenpolrohr 25a aus nichtmagnetischem Material, beispielsweise aus Aluminium. Die Trennwand 35 ist gebildet durch zwei ringförmige, aus magnetischem Material, insbesondere aus magnetischem Lotmaterial bestehende Polkörper 46, 47, zwischen denen der aus nichtmagnetischem Material bestehende Zwischenbereich 32a angeordnet ist. Die beiden Polkörper 46, 47 übernehmen die Funktion der (magnetischen) Wandabschnitte 23, 31 der Magnetbaugruppe 10.In the Fig. 3 is one opposite the Fig. 1 modified magnetic assembly 10a shown. In the magnet assembly 10a, the wall portion 23a of the Außenpolrohrs 16a formed in its radial extent reduced in size, and the inner pole tube 25a has no radially outwardly projecting portion at the level of the wall portion 23a. In addition, both the outer pole tube 16a and the inner pole tube 25a are made of non-magnetic material such as aluminum. The partition wall 35 is formed by two annular, consisting of magnetic material, in particular of magnetic solder material pole body 46, 47, between which the non-magnetic material existing intermediate region 32a is arranged. The two pole bodies 46, 47 assume the function of the (magnetic) wall sections 23, 31 of the magnet assembly 10.

Die Magnetbaugruppe 10 lässt sich fertigungstechnisch besonders einfach herstellen, wenn entsprechend der Darstellung der Fig. 4 ein zunächst einstückig ausgebildetes Bauteil 50 verwendet wird, das aus magnetisch wirksamen Material besteht, und das nach der nunmehr beschriebenen Endbearbeitung das Außenpolrohr 16 und das Innenpolrohr 25 ausbildet. Hierzu wird in einem ersten Schritt in einem horizontal umlaufenden, ringförmigen Wandbereich 51 auf der dem Aufnahmeraum 36 zugewandten Seite eine V-förmige Ringnut 52 ausgebildet, in die anschließend das (nichtmagnetische) Lotmaterial, das den Zwischenbereich 32 ausbildet, eingebracht wird. Anschließend wird entsprechend der Fig. 5 der Wandbereich 51 von beiden Seiten her durch eine spanende Materialbearbeitung (insbesondere Schleifen) bearbeitet, wodurch sich die Wandstärke des Wandbereichs 51 reduziert und gleichzeitig ebene Stirnflächen 53, 54 ausgebildet werden. Durch die Reduzierung der Wandstärke des Wandbereichs 51 bildet der Zwischenbereich 32 einen Teil der Stirnflächen 53, 54 aus.The magnet assembly 10 can be manufactured particularly easy to produce if, according to the representation of Fig. 4 an initially integrally formed member 50 is used, which consists of magnetically active material, and the outer pole tube 16 and the Innenpolrohr 25 forms after the now described finishing. For this purpose, in a first step, a V-shaped annular groove 52 is formed in a horizontally encircling annular wall region 51 on the side facing the receiving space 36, into which the (non-magnetic) solder material forming the intermediate region 32 is subsequently introduced. Subsequently, according to the Fig. 5 the wall region 51 is machined from both sides by machining material (in particular grinding), whereby the wall thickness of the wall region 51 is reduced and at the same time flat end faces 53, 54 are formed. By reducing the wall thickness of the wall region 51, the intermediate region 32 forms a part of the end faces 53, 54.

Die soweit beschriebene Magnetbaugruppen 10, 10a bzw. der Kraftstoffinjektor 100 können in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen. Insbesondere ist es auch denkbar, auch die Magnetbaugruppe 10a mit dem in den Fig. 4 und 5 beschriebenen Verfahren herzustellen, wozu dann mehrere Ringnuten ausgebildet werden, die mit dem Material des Zwischenbereichs 32a sowie der Polkörper 46, 47 ausgefüllt werden.The magnetic assemblies 10, 10a or the fuel injector 100 described so far can be modified or modified in many ways without deviating from the inventive concept. In particular, it is also conceivable that the magnetic assembly 10a with the in the 4 and 5 to manufacture then, for which purpose a plurality of annular grooves are formed, which are filled with the material of the intermediate region 32a and the pole body 46, 47.

Claims (10)

Magnetbaugruppe (10; 10a) für einen Kraftstoffinjektor (100), mit einer in einem Magnetkern (37) angeordneten Magnetspule (40), die mit einem Magnetanker (11) zusammenwirkt, der gegenüberliegend zu einer Stirnseite (44) der Magnetspule (40) angeordnet ist, und der zumindest mittelbar der Beeinflussung eines Kraftstoffflusses dient,
dadurch gekennzeichnet,
dass der Magnetkern (37) und die Magnetspule (40) in einem Polrohrgehäuse (19) aufgenommen sind, das aus einem Innenpolrohr (25; 25a) und einem Außenpolrohr (16; 16a) besteht, die konzentrisch zueinander angeordnet sind, wobei zwischen dem Innenpolrohr (25; 25a) und dem Außenpolrohr (16; 16a) auf der dem Magnetanker (11) zugewandten Seite eine vorzugsweise senkrecht zur Längsachse (21) des Magnetankers (11) angeordnete Trennwand (35) ausgebildet ist, in der in zumindest teilweiser Überdeckung mit der Stirnseite (44) der Magnetspule (40) ein nichtmagnetisches Zwischenelement (32; 32a) angeordnet ist, wobei das Polrohrgehäuse (19) im Bereich der Trennwand (35) in zumindest teilweiser Überdeckung mit dem Magnetkern (37) wenigstens einen magnetisch wirksamen Wandabschnitt (23; 23a, 31) oder wenigstens einen magnetisch wirksamen Polkörper (46, 47) aufweist, und wobei die Trennwand (35) eine hydraulische Abdichtung zwischen einem Druckraum (12) für den Magnetanker (11) und einem Aufnahmeraum (36) für die Magnetspule (40) und den Magnetkern (37) ausbildet.A magnet assembly (10; 10a) for a fuel injector (100) comprising a magnetic coil (40) disposed in a magnetic core (37) and cooperating with a magnetic armature (11) disposed opposite an end face (44) of the magnetic coil (40) is, and which at least indirectly serves to influence a fuel flow,
characterized,
in that the magnet core (37) and the magnet coil (40) are accommodated in a pole tube housing (19) which consists of an inner pole tube (25; 25a) and an outer pole tube (16; 16a) which are arranged concentrically with one another, wherein between the inner pole tube (25; 25a) and the outer pole tube (16; 16a) on the side facing the magnet armature (11) a preferably perpendicular to the longitudinal axis (21) of the magnet armature (11) arranged partition wall (35) is formed, in at least partially overlap with a non-magnetic intermediate element (32; 32a) is arranged on the end face (44) of the magnet coil (40), wherein the pole tube housing (19) at least partially covers the magnet core (37) in at least partially overlapping the magnet core (37). 23, 23 a, 31) or at least one magnetically active polar body (46, 47), and wherein the partition (35) has a hydraulic seal between a pressure chamber (12) for the armature (11) and an up receiving space (36) for the magnetic coil (40) and the magnetic core (37) is formed. Magnetbaugruppe nach Anspruch 1,
dadurch gekennzeichnet,
dass das Innenpolrohr (25) und das Außenpolrohr (16) aus magnetisch wirksamen Material bestehen.Magnet assembly according to claim 1,
characterized,
in that the inner pole tube (25) and the outer pole tube (16) consist of magnetically active material. Magnetbaugruppe nach Anspruch 1,
dadurch gekennzeichnet,
dass das Innenpolrohr (25a) und das Außenpolrohr (16a) aus nichtmagnetischem Material bestehen, und dass das Innenpolrohr (25a) und das Außenpolrohr (16a) im Bereich der Trennwand (35) mit zwei aus magnetisch wirksamen Material bestehenden, ringförmigen Polkörpern (46, 47) verbunden sind, zwischen denen das nichtmagnetische Zwischenelement (32a) angeordnet ist.Magnet assembly according to claim 1,
characterized,
in that the inner pole tube (25a) and the outer pole tube (16a) are made of non-magnetic material, and in that the inner pole tube (25a) and the outer pole tube (16a) are provided in the region of the dividing wall (35) with two annular magnet bodies (46, 46) made of magnetically active material. 47) are connected, between which the non-magnetic intermediate element (32 a) is arranged. Magnetbaugruppe nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass das nichtmagnetische Zwischenelement (32; 32a) in Richtung der Längsachse (21) des Magnetankers (11) einen sich zum Magnetanker (11) hin verjüngenden Querschnitt aufweist.Magnetic assembly according to one of claims 1 to 3,
characterized,
in that the nonmagnetic intermediate element (32; 32a) has a cross section which narrows towards the magnet armature (11) in the direction of the longitudinal axis (21) of the magnet armature (11). Magnetbaugruppe nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
dass das nichtmagnetische Zwischenelement (32; 32a) aus Lotmaterial besteht.Magnet assembly according to one of claims 1 to 4,
characterized,
that the non-magnetic intermediate element (32; 32a) consists of solder material. Magnetbaugruppe nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
dass das Außenpolrohr (16; 16a) einen Teil des Aufnahmeraums für den Magnetanker (11) ausbildet, und dass das Polrohrgehäuse (19) auf der dem Magnetanker (11) abgewandten Seite zumindest bereichsweise von Kunststoff umspritzt ist, der gleichzeitig einen Steckeranschlussbereich (42) ausbildet.Magnetic assembly according to one of claims 1 to 5,
characterized,
that the outer pole tube (16; 16a) forms part of the receiving space for the magnet armature (11), and that the pole tube housing (19) is at least partially encapsulated by plastic on the side facing away from the magnet armature (11), which at the same time has a plug connection region (42). formed. Verfahren zum Herstellen einer Magnetbaugruppe (10; 10a) nach einem der Ansprüche 1 bis 6, bei dem zwischen einem Innenpolrohr (25; 25a) und einem Außenpolrohr (16; 16a) in einer Trennwand (35) ein nichtmagnetisches Zwischenelement (32; 32a) angeordnet wird,
dadurch gekennzeichnet,
dass die Trennwand (35) zumindest im Bereich des nichtmagnetischen Zwischenelements (32; 32a) durch einen spanenden Materialabtrag bearbeitet wird.Method for producing a magnet assembly (10; 10a) according to one of Claims 1 to 6, in which a nonmagnetic intermediate element (32; 32a) is provided between an inner pole tube (25; 25a) and an outer pole tube (16; 16a) in a dividing wall (35). is arranged
characterized,
in that the dividing wall (35) is machined, at least in the region of the nonmagnetic intermediate element (32; 32a), by a cutting material removal. Verfahren nach Anspruch 7,
dadurch gekennzeichnet,
dass zwischen dem Außenpolrohr (16a) und dem Innenpolrohr (25a) jeweils aus magnetischem Lot bestehende Polkörper (46, 47) ausgebildet werden, zwischen denen das aus nichtmagnetischem Lot bestehende Zwischenelement (32a) angeordnet ist.Method according to claim 7,
characterized,
in that between the outer pole tube (16a) and the inner pole tube (25a) there are respectively formed magnetic bodies (46, 47) between which the intermediate element (32a) made of nonmagnetic solder is arranged. Verfahren nach Anspruch 7 oder 8,
dadurch gekennzeichnet,
dass zur Ausbildung des Innenpolrohrs (25; 25a) und des Außenpolrohrs (16; 16a) ein einstückiges Bauteil (50) verwendet wird, dass im Bereich der Trennwand (35) in eine Stirnseite des Bauteils (50) wenigstens eine radial umlaufende Ringnut (52) ausgebildet wird, dass die wenigstens eine Ringnut (52) mit Lotmaterial ausgefüllt wird, und dass anschließend zumindest auf der der wenigstens einen Ringnut (52) gegenüberliegenden Stirnseite des Bauteils (50) ein Materialabtrag erfolgt, derart, dass das Material des Bauteils (50) bis in den Bereich des Lots entfernt wird.Method according to claim 7 or 8,
characterized,
in that an integral component (50) is used for forming the inner pole tube (25; 25a) and the outer pole tube (16), that at least one radially encircling annular groove (52) is provided in the region of the dividing wall (35) in an end face of the component (50) ) is formed, that the at least one annular groove (52) is filled with solder material, and that then at least on the at least one annular groove (52) opposite end side of the component (50) takes place a material removal, such that the material of the component (50 ) is removed to the area of the solder. Kraftstoffinjektor (100) mit einer Magnetbaugruppe (10; 10a) nach einem der Ansprüche 1 bis 9.A fuel injector (100) comprising a magnet assembly (10; 10a) according to any one of claims 1 to 9.
EP13191504.3A 2012-12-21 2013-11-05 Magnet module for a fuel injector, method for producing a magnet module and fuel injector Not-in-force EP2746565B1 (en)

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DE112017003766T5 (en) 2016-07-28 2019-04-11 Denso Corporation Fuel injection valve

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CN109488505B (en) * 2018-11-01 2021-04-06 零八一电子集团四川力源电子有限公司 Connection structure and connection method for tailstock and shell of high-voltage common-rail high-speed electromagnet

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DE102012224203A1 (en) 2014-06-26

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