EP1062421B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP1062421B1
EP1062421B1 EP99955826A EP99955826A EP1062421B1 EP 1062421 B1 EP1062421 B1 EP 1062421B1 EP 99955826 A EP99955826 A EP 99955826A EP 99955826 A EP99955826 A EP 99955826A EP 1062421 B1 EP1062421 B1 EP 1062421B1
Authority
EP
European Patent Office
Prior art keywords
valve
inner pole
sleeve
fuel injection
core
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.)
Expired - Lifetime
Application number
EP99955826A
Other languages
German (de)
French (fr)
Other versions
EP1062421A1 (en
Inventor
Klaus Noller
Peter Asslaender
Hubert Stier
Hans Weidler
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 EP1062421A1 publication Critical patent/EP1062421A1/en
Application granted granted Critical
Publication of EP1062421B1 publication Critical patent/EP1062421B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49428—Gas and water specific plumbing component making
    • Y10T29/49432—Nozzle making
    • Y10T29/49433—Sprayer

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • an electromagnetically operable fuel injection valve which, inter alia, has a non-magnetic sleeve as the connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body. The sleeve extends over its entire axial length with a constant outer diameter and a constant inner diameter and has correspondingly at its two ends the same size inlet openings.
  • the core and the valve seat body are formed with such an outer diameter that they extend into the sleeve at the two ends, so that the sleeve completely surrounds the two components core and valve seat body in these projecting areas.
  • a valve needle with an armature In the interior of the sleeve moves in the axial direction, a valve needle with an armature, which is guided by the sleeve.
  • the solid connections of the sleeve with the core and the valve seat body are z. B. achieved by welding.
  • a fuel injection valve having an elongated, thin-walled, non-magnetic sleeve, which still has a bottom portion next to its shell portion. The bottom portion is largely perpendicular to the otherwise axial extent of the sleeve along the valve longitudinal axis.
  • a valve needle can move axially.
  • a fixedly connected to the valve needle valve closing body cooperates with a provided on a valve seat body valve seat surface, wherein the valve seat body is pressed into the sleeve and rests directly or indirectly with a perforated disc at the bottom portion of the sleeve.
  • tubular core is arranged in the through hole of the sleeve, which is designed as a rotating part.
  • the core is fixedly connected to the sleeve in a desired position by welding.
  • a similar arrangement of a tubular core in a valve sleeve is also from the DE-OS 197 12 590 known.
  • a fuel injection valve which has a setting bush, with the aid of which the spring force of a built-in in the fuel injection valve return spring is adjusted.
  • This adjusting bushing is manufactured by means of rollers.
  • the adjusting bushing and the return spring are arranged in a flow bore of a serving as an inner pole fixed core, the return spring is provided without radial contact in the flow bore, while the adjusting bush is pressed in the inner pole with a certain radial spring tension through an axially extending longitudinal slot.
  • the adjusting bushing is a small metallic component which has the sole function of biasing the return spring.
  • a function in the electromagnetic drive of the fuel injection valve does not have this adjusting bushing.
  • the core as a magnetic component of the electromagnetic drive is formed in a known manner by turning as a hollow cylindrical component.
  • such serving as inner poles magnetic cores for fuel injection valves are produced by cutting surface ablation, wherein turning, milling, drilling and finishing steps are the known methods for producing these magnetic cores.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that it can be produced in a very simple manner and can be mounted. When rolling or bending is a relatively simple and inexpensive manufacturing process with relatively little cost of materials.
  • the inner pommel is made of a simple metallic strip. By rolling this strip results in an axially extending longitudinal slot at the inner pole, which in turn results in a reduction of the eddy currents, whereby a higher efficiency of the magnetic circuit is achieved.
  • the installation of the inner pole in the valve sleeve and the stroke adjustment using the inner pole is significantly simplified.
  • the inner pole After rolling or bending the inner pole is on the one hand from the outset under a radial bias, which can easily fix the inner pole in the valve sleeve.
  • the inner pole is due to its longitudinal slot in a small way radially variable in size, so that when inserting the inner pole in the valve sleeve advantageously a burr is avoided.
  • the inner pole can also be moved to adjust the stroke of a valve needle in the valve sleeve with an adjustment.
  • the valve sleeve advantageously near the inner pole has a shoulder on which an adjustment tool can attack as well as the inner pole.
  • FIG. 1 a fuel injection valve with an inner pole according to the invention
  • FIG. 2 the inner pole having valve assembly in a different scale
  • FIG. 3 a plan view of the inner pole.
  • electromagnetically operable valve according to the invention in the form of an injection valve for fuel injection systems of mixture-compression, spark-ignition internal combustion engines has a tubular core 2 surrounded by a magnetic coil 1, serving as réellepol and partially as fuel flow.
  • the solenoid 1 is of an outer, sleeve-shaped and stepped running , z.
  • the magnetic coil 1, the core 2 and the valve shell 5 together form an electrically excitable actuator.
  • solenoid coil 1 surrounds a valve sleeve 6 from the outside, the core 2 in an inner, concentric with a valve longitudinal axis 10 extending opening 11 of the valve sleeve 6 is introduced.
  • the example ferritic valve sleeve 6 is elongated and thin-walled and has a shell portion 12 and a bottom portion 13, wherein the shell portion 12 in the circumferential direction and the bottom portion 13 in the axial direction at its downstream end the opening 11th limit.
  • the opening 11 also serves as a guide opening for a valve needle 14 which is axially movable along the valve longitudinal axis 10.
  • valve seat body 15 which may be e.g. is seated on the bottom portion 13 of the valve sleeve 6 and has a fixed valve seat surface 16 as a valve seat.
  • the valve needle 14 is formed for example by a tubular anchor portion 17, a likewise tubular needle portion 18 and a spherical valve-closing body 19, wherein the valve closing body 19, for example. is firmly connected to the needle portion 18 by means of a weld.
  • a flat spray disk 21 is arranged, wherein the solid compound of valve seat body 15 and spray orifice plate 21 z.
  • one or more transverse openings 22 are provided, so that the armature portion 17 in an inner longitudinal bore 23 fuel passing outwards and on the valve closing body 19, for. can flow along flats 24 to the valve seat surface 16 along.
  • the actuation of the injection valve takes place in a known manner electromagnetically.
  • the electromagnetic circuit with the solenoid coil 1, the inner core 2, the outer valve shell 5 and the anchor portion 17 is used Anchor portion 17 is connected to the Valve-closure member 19 facing away from the end of the core 2.
  • the spherical valve closing body 19 cooperates with the valve seat surface 16 of the valve seat body 15, which tapers in the direction of the flow in the direction of flow and which is formed in the axial direction downstream of a guide opening in the valve seat body 15.
  • the spray perforated disc 21 has at least one, for example, four ejection openings 27 formed by erosion, laser drilling or punching.
  • the insertion depth of the core 2 in the injection valve is decisive for the stroke of the valve needle 14.
  • the one end position of the valve needle 14 is fixed in the non-energized magnetic coil 1 by the contact of the valve closing body 19 on the valve seat surface 16 of the valve seat body 15, while the other End position of the valve needle 14 results in energized solenoid coil 1 by the system of the anchor portion 17 at the downstream end of the core.
  • the stroke is adjusted by an axial displacement of the core 2 in the valve sleeve 6, which is connected according to the desired position fixed to the valve sleeve 6.
  • the core 2 has a relation to the inner diameter of the valve sleeve 6 small excess.
  • the fixation of the core 2 and thus the adjustment of the valve needle stroke is therefore preferably self-locking.
  • the core 2 can also be fastened to the valve sleeve 6 with a welding point or a circumferential weld seam.
  • a set spring 29 is inserted in a concentric with the valve longitudinal axis 10 extending flow bore 28 of the core 2, which serves to supply the fuel in the direction of the valve seat surface 16, except the return spring 25 is an adjusting element in the form a set spring 29 is inserted.
  • the adjusting spring 29 is used to adjust the spring preload applied to the adjusting spring 29 return spring 25, which in turn is supported with its opposite side to the valve needle 14, wherein an adjustment of the dynamic Abspritzmenge with the adjusting spring 29.
  • the adjusting element may also be designed instead of a setting spring as an adjusting bolt, adjusting sleeve, etc.
  • the injector described so far is characterized by its particularly compact design, so that a very small, handy injection valve is created.
  • These components form a preassembled independent assembly, which is called function part 30 below.
  • the functional part 30 therefore essentially comprises the electromagnetic circuit 1, 2, 5 and a sealing valve (valve closing body 19, valve seat body 15) with a subsequent jet treatment element (spray perforated disk 21).
  • the coil space formed between the valve jacket 5 and the valve sleeve 6 and almost completely filled by the magnetic coil 1 is limited in the valve seat body 15 facing direction by a stepped radial portion 32 of the valve shell 5, while the conclusion on the valve seat body 15 side facing away by a disc-shaped cover 33 is guaranteed. In a recess of the cover 33 this is penetrated by the bobbin 3. In this area, for example, two pins 34 are made of the plastic of the bobbin 3 out. About the electrical contact pins 34, the electrical contacting of the magnetic coil 1 and thus the excitation.
  • connection part 40 is characterized above all by the fact that it comprises the electrical and the hydraulic connection of the fuel injection valve.
  • the largely designed as a plastic part connector 40 therefore has a fuel inlet nozzle serving as a tubular body 42.
  • a fuel filter 45 is inserted or pressed.
  • a hydraulic connection of connecting part 40 and functional part 30 is achieved in the fully assembled fuel injection valve in that the flow holes 43 and 28 of both modules are brought to each other so that an unimpeded flow through the fuel is ensured.
  • An inner opening 46 in the cover 33 allows the valve sleeve 6 and thus also the core 2 to be formed such that both project through the opening 46 and at least the valve sleeve 6 projects clearly beyond the cover element 33 in the direction of the connection part 40.
  • a lower end 47 of the tube 44 projects into the protruding part of the valve sleeve 6 to increase the connection stability into the opening 11 of the valve sleeve 6.
  • the main body 42 sits in the mounted state, for example on the cover 33 and the upper end of the valve shell 5.
  • connection part 40 two electrical contact elements 55 are provided in the connection part 40, which during the Plastic injection molding process of the body 42 are injected and subsequently embedded embedded in the plastic.
  • the electrical contact elements 55 terminate at one end as exposed contact pins of the electrical connector plug 56, which is connected to a corresponding electrical connection element, not shown, such. B. a contact strip, can be connected for complete electrical contacting of the injector.
  • the contact elements 55 form an electrical connection with the corresponding contact pins 34.
  • valve assembly of the entire fuel injection valve is shown, said valve assembly is essentially formed by the valve sleeve 6 and the fixed and axially movable components within the valve sleeve 6.
  • the core 2 completely immersed in the valve sleeve 6, which means that it is surrounded over its entire axial extension length in the circumferential direction of the valve sleeve 6.
  • the valve sleeve 6, which completely ensures a tightness towards the outside, makes it possible to use a core 2 which can be produced by means of rollers or bending.
  • the core 2 is made according to the invention of a metallic strip with a uniform thickness, which is stamped out of a plate according to the required dimensions in the form of a quadrilateral, in particular a rectangle and then rolled or bent about with the aid of a mandrel-shaped tool in the desired shape is, so that it ultimately has a circular cross-section.
  • Strip ends 61, 62 have an axially extending longitudinal slot 63, as they face each other at a slight distance, such as FIG. 3 as a plan view of the core 2 shows.
  • Such a shaped core 2 has several advantages over the known formed as a rotating parts cores in fuel injection valves. When rolling or bending is a relatively simple and inexpensive manufacturing process with relatively little cost of materials. By the axially extending longitudinal slot 63 of the core 2 results in a reduction of the eddy currents, whereby a higher efficiency of the magnetic circuit is achieved.
  • the assembly of the core 2 in the valve sleeve 6 and the stroke adjustment by means of the core 2 is significantly simplified.
  • the core 2 has after rolling or bending to an outer diameter which is slightly larger than the diameter of the opening 11 of the valve sleeve 6.
  • the core 2 is on the one hand from the outset under a radial bias, the core 2 simply in the valve sleeve. 6 fix it.
  • the core 2 is due to its longitudinal slot 63 in a small way radially variable in size, so that when inserting the core 2 in the valve sleeve 6 advantageously a burr formation is avoided.
  • the core 2 can also be moved to the stroke adjustment of the valve needle 14 in the valve sleeve 6 with a setting tool.
  • valve sleeve 6 it is advantageous to provide a shoulder 65 in the valve sleeve 6 near an upstream end face 64 of the core 2.
  • the valve sleeve 6 has a larger diameter than downstream of the shoulder 65, ie in the area in which the core 2 is inserted in the opening 11.
  • an adjustment tool engages, for example, on the core 2 and on the valve sleeve 6, such that, on the one hand, a force in the downstream direction on the core 2 and, on the other hand, a counterforce in the upstream direction on the shoulder 65 of the valve sleeve 6 be applied, whereby a positive connection between the valve sleeve 6 and the core 2 is achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Aus der US-PS 4,946,107 ist bereits ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, das unter anderem eine unmagnetische Hülse als Verbindungsteil zwischen einem Kern und einem Ventilsitzkörper aufweist. Mit ihren beiden axialen Enden ist die Hülse fest mit dem Kern und mit dem Ventilsitzkörper verbunden. Die Hülse verläuft über ihre gesamte axiale Länge mit einem konstanten Außendurchmesser und einem konstanten Innendurchmesser und besitzt entsprechend an ihren beiden Enden gleich große Eintrittsöffnungen. Der Kern und der Ventilsitzkörper sind mit einem solchen Außendurchmesser ausgebildet, dass sie in die Hülse an den beiden Enden hineinreichen, so dass die Hülse die beiden Bauteile Kern und Ventilsitzkörper in diesen hineinragenden Bereichen vollständig umgibt. Im Inneren der Hülse bewegt sich in axialer Richtung eine Ventilnadel mit einem Anker, der durch die Hülse geführt wird. Die festen Verbindungen der Hülse mit dem Kern und dem Ventilsitzkörper werden z. B. mittels Schweißen erzielt. Mit Hilfe der rohrförmigen Hülse lässt sich das Volumen und das Gewicht des Brennstoffeinspritzventiles reduzieren.From the U.S. Patent 4,946,107 For example, an electromagnetically operable fuel injection valve is known which, inter alia, has a non-magnetic sleeve as the connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body. The sleeve extends over its entire axial length with a constant outer diameter and a constant inner diameter and has correspondingly at its two ends the same size inlet openings. The core and the valve seat body are formed with such an outer diameter that they extend into the sleeve at the two ends, so that the sleeve completely surrounds the two components core and valve seat body in these projecting areas. In the interior of the sleeve moves in the axial direction, a valve needle with an armature, which is guided by the sleeve. The solid connections of the sleeve with the core and the valve seat body are z. B. achieved by welding. With Help the tubular sleeve can reduce the volume and weight of the fuel injection valve.

Bekannt ist aus der DE-OS 195 47 406 außerdem ein Brennstoffeinspritzventil, das eine langgestreckte, dünnwandige, nichtmagnetische Hülse aufweist, die neben ihrem Mantelabschnitt noch einen Bodenabschnitt besitzt. Der Bodenabschnitt verläuft weitgehend senkrecht zur ansonsten axialen Erstreckung der Hülse entlang der Ventillängsachse. In einer Durchgangsöffnung der Hülse kann sich eine Ventilnadel axial bewegen. Ein fest mit der Ventilnadel verbundener Ventilschließkörper wirkt mit einer an einem Ventilsitzkörper vorgesehenen Ventilsitzfläche zusammen, wobei der Ventilsitzkörper in der Hülse eingepresst ist und direkt oder indirekt mit einer Lochscheibe an dem Bodenabschnitt der Hülse anliegt. Neben der axial beweglichen Ventilnadel und dem Ventilsitzkörper ist in der Durchgangsöffnung der Hülse ein als Innenpol dienender rohrförmiger Kern angeordnet, der als Drehteil ausgebildet ist. Der Kern wird in einer gewünschten Position durch Schweißen fest mit der Hülse verbunden. Eine ähnliche Anordnung eines rohrförmigen Kerns in einer Ventilhülse ist auch aus der DE-OS 197 12 590 bekannt.Is known from the DE-OS 195 47 406 In addition, a fuel injection valve having an elongated, thin-walled, non-magnetic sleeve, which still has a bottom portion next to its shell portion. The bottom portion is largely perpendicular to the otherwise axial extent of the sleeve along the valve longitudinal axis. In a passage opening of the sleeve, a valve needle can move axially. A fixedly connected to the valve needle valve closing body cooperates with a provided on a valve seat body valve seat surface, wherein the valve seat body is pressed into the sleeve and rests directly or indirectly with a perforated disc at the bottom portion of the sleeve. In addition to the axially movable valve needle and the valve seat body serving as an inner pole tubular core is arranged in the through hole of the sleeve, which is designed as a rotating part. The core is fixedly connected to the sleeve in a desired position by welding. A similar arrangement of a tubular core in a valve sleeve is also from the DE-OS 197 12 590 known.

Aus der DE 41 08 665 A1 ist bereits ein Brennstoffeinspritzventil bekannt, das eine Einstellbuchse aufweist, mit deren Hilfe die Federkraft einer in dem Brennstoffeinspritzventil eingebauten Rückstellfeder eingestellt wird. Diese Einstellbuchse wird mittels Rollen hergestellt. Die Einstellbuchse und die Rückstellfeder sind dabei in einer Strömungsbohrung eines als Innenpol dienenden festen Kerns angeordnet, wobei die Rückstellfeder ohne radiale Berührung in der Strömungsbohrung vorgesehen ist, während die Einstellbuchse im Innenpol mit gewisser radialer Federspannung durch einen axial verlaufenden Längsschlitz eingepresst ist. Die Einstellbuchse ist ein kleines metallisches Bauteil, das alleinig die Funktion hat, die Rückstellfeder vorzuspannen. Eine Funktion im elektromagnetischen Antrieb des Brennstoffeinspritzventils hat diese Einstellbuchse nicht. Der Kern als Magnetbauteil des elektromagnetischen Antriebs ist in bekannter Weise mittels Drehen als hohlzylindrisches Bauteil ausgeformt.From the DE 41 08 665 A1 A fuel injection valve is already known, which has a setting bush, with the aid of which the spring force of a built-in in the fuel injection valve return spring is adjusted. This adjusting bushing is manufactured by means of rollers. The adjusting bushing and the return spring are arranged in a flow bore of a serving as an inner pole fixed core, the return spring is provided without radial contact in the flow bore, while the adjusting bush is pressed in the inner pole with a certain radial spring tension through an axially extending longitudinal slot. The adjusting bushing is a small metallic component which has the sole function of biasing the return spring. A function in the electromagnetic drive of the fuel injection valve does not have this adjusting bushing. The core as a magnetic component of the electromagnetic drive is formed in a known manner by turning as a hollow cylindrical component.

Üblicherweise werden derartige als Innenpole dienende Magnetkerne für Brennstoffeinspritzventile durch spanendes Oberflächenabtragen hergestellt, wobei Drehen, Fräsen, Bohren und Feinbearbeitungsschritte die bekannten Verfahren zur Herstellung dieser Magnetkerne sind.Usually, such serving as inner poles magnetic cores for fuel injection valves are produced by cutting surface ablation, wherein turning, milling, drilling and finishing steps are the known methods for producing these magnetic cores.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass es auf sehr einfache Art und Weise herstellbar und montierbar ist. Bei dem Rollen bzw. Biegen handelt es sich um ein vergleichsweise einfaches und kostengünstiges Herstellungsverfahren mit relativ geringem Materialaufwand.The fuel injection valve according to the invention with the features of claim 1 has the advantage that it can be produced in a very simple manner and can be mounted. When rolling or bending is a relatively simple and inexpensive manufacturing process with relatively little cost of materials.

Der Innenpoll wird aus einem einfachen metallischen Streifen hergestellt. Durch das Rollen dieses Streifens ergibt sich ein axial verlaufender Längsschlitz am Innenpol, durch den sich wiederum eine Reduzierung der Wirbelströme ergibt, wodurch eine höhere Effizienz des Magnetkreises erzielt wird.The inner pommel is made of a simple metallic strip. By rolling this strip results in an axially extending longitudinal slot at the inner pole, which in turn results in a reduction of the eddy currents, whereby a higher efficiency of the magnetic circuit is achieved.

Durch die in den abhägigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements and improvements of claim 1 fuel injector are possible.

Außerdem wird die Montage des Innenpols in der Ventilhülse sowie die Hubeinstellung mit Hilfe des Innenpols deutlich vereinfacht. Nach dem Rollen bzw. Biegen steht der Innenpol einerseits von vornherein unter einer radialen Vorspannung, die den Innenpol einfach in der Ventilhülse fixieren lässt. Andererseits ist der Innenpol aufgrund seines Längsschlitzes in geringer Weise radial in seiner Größe veränderbar, so dass beim Einschieben des Innenpols in die Ventilhülse in vorteilhafter Weise eine Gratbildung vermieden wird.In addition, the installation of the inner pole in the valve sleeve and the stroke adjustment using the inner pole is significantly simplified. After rolling or bending the inner pole is on the one hand from the outset under a radial bias, which can easily fix the inner pole in the valve sleeve. On the other hand, the inner pole is due to its longitudinal slot in a small way radially variable in size, so that when inserting the inner pole in the valve sleeve advantageously a burr is avoided.

Entsprechend einfach kann der Innenpol auch zur Hubeinstellung einer Ventilnadel in der Ventilhülse mit einem Einstellwerkzeug verschoben werden. Dazu besitzt die Ventilhülse in vorteilhafter Weise nahe des Innenpols einen Absatz, an dem ein Einstellwerkzeug ebenso angreifen kann wie am Innenpol.Correspondingly simple, the inner pole can also be moved to adjust the stroke of a valve needle in the valve sleeve with an adjustment. For this purpose, the valve sleeve advantageously near the inner pole has a shoulder on which an adjustment tool can attack as well as the inner pole.

Auf diese Weise ist eine kraftschlüssige Verbindung zwischen der Ventilhülse und dem Innenpol erzielbar.In this way, a frictional connection between the valve sleeve and the inner pole can be achieved.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Brennstoffeinspritzventil mit einem erfindungsgemäßen Innenpol, Figur 2 die den Innenpol aufweisende Ventilbaugruppe in einem veränderten Maßstab und Figur 3 eine Draufsicht auf den Innenpol.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 a fuel injection valve with an inner pole according to the invention, FIG. 2 the inner pole having valve assembly in a different scale and FIG. 3 a plan view of the inner pole.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Das in der Figur 1 beispielhaft dargestellte, erfindungsgemäße elektromagnetisch betätigbare Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Innenpol und teilweise als Brennstoffdurchfluss dienenden rohrförmigen Kern 2. Die Magnetspule 1 ist von einem äußeren, hülsenförmigen und gestuft ausgeführten, z. B. ferromagnetischen Ventilmantel 5, der einen Außenpol bzw. ein äußeres Magnetkreisbauteil darstellt, in Umfangsrichtung vollständig umgeben. Die Magnetspule 1, der Kern 2 und der Ventilmantel 5 bilden zusammen ein elektrisch erregbares Betätigungselement.That in the FIG. 1 by way of example, electromagnetically operable valve according to the invention in the form of an injection valve for fuel injection systems of mixture-compression, spark-ignition internal combustion engines has a tubular core 2 surrounded by a magnetic coil 1, serving as Innenpol and partially as fuel flow. The solenoid 1 is of an outer, sleeve-shaped and stepped running , z. B. ferromagnetic valve jacket 5, which is an outer pole or an outer magnetic circuit component, completely surrounded in the circumferential direction. The magnetic coil 1, the core 2 and the valve shell 5 together form an electrically excitable actuator.

Während die in einem Spulenkörper 3 eingebettete Magnetspule 1 eine Ventilhülse 6 von außen umgibt, ist der Kern 2 in einer inneren, konzentrisch zu einer Ventillängsachse 10 verlaufenden Öffnung 11 der Ventilhülse 6 eingebracht. Die z.B. ferritische Ventilhülse 6 ist langgestreckt und dünnwandig ausgeführt und besitzt einen Mantelabschnitt 12 und einen Bodenabschnitt 13, wobei der Mantelabschnitt 12 in Umfangsrichtung und der Bodenabschnitt 13 in axialer Richtung an ihrem stromabwärtigen Ende die Öffnung 11 begrenzen. Die Öffnung 11 dient auch als Führungsöffnung für eine entlang der Ventillängsachse 10 axial bewegliche Ventilnadel 14.While embedded in a bobbin 3 solenoid coil 1 surrounds a valve sleeve 6 from the outside, the core 2 in an inner, concentric with a valve longitudinal axis 10 extending opening 11 of the valve sleeve 6 is introduced. The example ferritic valve sleeve 6 is elongated and thin-walled and has a shell portion 12 and a bottom portion 13, wherein the shell portion 12 in the circumferential direction and the bottom portion 13 in the axial direction at its downstream end the opening 11th limit. The opening 11 also serves as a guide opening for a valve needle 14 which is axially movable along the valve longitudinal axis 10.

Neben dem Kern 2 und der Ventilnadel 14 ist in der Öffnung 11 des weiteren ein Ventilsitzkörper 15 angeordnet, der z.B. auf dem Bodenabschnitt 13 der Ventilhülse 6 aufsitzt und eine feste Ventilsitzfläche 16 als Ventilsitz aufweist. Die Ventilnadel 14 wird beispielsweise von einem rohrförmigen Ankerabschnitt 17, einem ebenfalls rohrförmigen Nadelabschnitt 18 und einem kugelförmigen Ventilschließkörper 19 gebildet, wobei der Ventilschließkörper 19 z.B. mittels einer Schweißnaht fest mit dem Nadelabschnitt 18 verbunden ist. An der stromabwärtigen Stirnseite des Ventilsitzkörpers 15 ist z. B. in einer kegelstumpfförmig verlaufenden Vertiefung 20 eine flache Spritzlochscheibe 21 angeordnet, wobei die feste Verbindung von Ventilsitzkörper 15 und Spritzlochscheibe 21 z. B. durch eine umlaufende dichte Schweißnaht realisiert ist. Im Nadelabschnitt 18 der Ventilnadel 14 sind eine oder mehrere Queröffnungen 22 vorgesehen, so dass den Ankerabschnitt 17 in einer inneren Längsbohrung 23 durchströmender Brennstoff nach außen treten und am Ventilschließkörper 19 z.B. an Abflachungen 24 entlang bis zur Ventilsitzfläche 16 strömen kann.In addition to the core 2 and the valve needle 14, a valve seat body 15, which may be e.g. is seated on the bottom portion 13 of the valve sleeve 6 and has a fixed valve seat surface 16 as a valve seat. The valve needle 14 is formed for example by a tubular anchor portion 17, a likewise tubular needle portion 18 and a spherical valve-closing body 19, wherein the valve closing body 19, for example. is firmly connected to the needle portion 18 by means of a weld. At the downstream end side of the valve seat body 15 z. B. in a frusto-conical recess 20 a flat spray disk 21 is arranged, wherein the solid compound of valve seat body 15 and spray orifice plate 21 z. B. is realized by a circumferential tight weld. In the needle portion 18 of the valve needle 14, one or more transverse openings 22 are provided, so that the armature portion 17 in an inner longitudinal bore 23 fuel passing outwards and on the valve closing body 19, for. can flow along flats 24 to the valve seat surface 16 along.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 14 und damit zum Öffnen entgegen der Federkraft einer an der Ventilnadel 14 angreifenden Rückstellfeder 25 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem inneren Kern 2, dem äußeren Ventilmantel 5 und dem Ankerabschnitt 17. Der Ankerabschnitt 17 ist mit dem dem Ventilschließkörper 19 abgewandten Ende auf den Kern 2 ausgerichtet.The actuation of the injection valve takes place in a known manner electromagnetically. For axial movement of the valve needle 14 and thus to open against the spring force of an acting on the valve needle 14 return spring 25 and closing the injector, the electromagnetic circuit with the solenoid coil 1, the inner core 2, the outer valve shell 5 and the anchor portion 17 is used Anchor portion 17 is connected to the Valve-closure member 19 facing away from the end of the core 2.

Der kugelförmige Ventilschließkörper 19 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 16 des Ventilsitzkörpers 15 zusammen, die in axialer Richtung stromabwärts einer Führungsöffnung im Ventilsitzkörper 15 ausgebildet ist. Die Spritzlochscheibe 21 besitzt wenigstens eine, beispielsweise vier durch Erodieren, Laserbohren oder Stanzen ausgeformte Abspritzöffnungen 27.The spherical valve closing body 19 cooperates with the valve seat surface 16 of the valve seat body 15, which tapers in the direction of the flow in the direction of flow and which is formed in the axial direction downstream of a guide opening in the valve seat body 15. The spray perforated disc 21 has at least one, for example, four ejection openings 27 formed by erosion, laser drilling or punching.

Die Einschubtiefe des Kerns 2 im Einspritzventil ist unter anderem entscheidend für den Hub der Ventilnadel 14. Dabei ist die eine Endstellung der Ventilnadel 14 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 19 an der Ventilsitzfläche 16 des Ventilsitzkörpers 15 festgelegt, während sich die andere Endstellung der Ventilnadel 14 bei erregter Magnetspule 1 durch die Anlage des Ankerabschnitts 17 am stromabwärtigen Kernende ergibt. Die Hubeinstellung erfolgt durch ein axiales Verschieben des Kerns 2 in der Ventilhülse 6, der entsprechend der gewünschten Position fest mit der Ventilhülse 6 verbunden wird. Der Kern 2 besitzt dazu ein gegenüber dem Innendurchmesser der Ventilhülse 6 geringes Übermaß. Die Fixierung des Kerns 2 und somit die Einstellung des Ventilnadelhubs geschieht deshalb vorzugsweise selbsthemmend. Alternativ kann der Kern 2 aber auch mit einem Schweißpunkt oder einer umlaufenden Schweißnaht an der Ventilhülse 6 befestigt werden.Among other things, the insertion depth of the core 2 in the injection valve is decisive for the stroke of the valve needle 14. The one end position of the valve needle 14 is fixed in the non-energized magnetic coil 1 by the contact of the valve closing body 19 on the valve seat surface 16 of the valve seat body 15, while the other End position of the valve needle 14 results in energized solenoid coil 1 by the system of the anchor portion 17 at the downstream end of the core. The stroke is adjusted by an axial displacement of the core 2 in the valve sleeve 6, which is connected according to the desired position fixed to the valve sleeve 6. The core 2 has a relation to the inner diameter of the valve sleeve 6 small excess. The fixation of the core 2 and thus the adjustment of the valve needle stroke is therefore preferably self-locking. Alternatively, however, the core 2 can also be fastened to the valve sleeve 6 with a welding point or a circumferential weld seam.

In eine konzentrisch zu der Ventillängsachse 10 verlaufende Strömungsbohrung 28 des Kerns 2, die der Zufuhr des Brennstoffs in Richtung der Ventilsitzfläche 16 dient, ist außer der Rückstellfeder 25 ein Einstellelement in der Form einer Einstellfeder 29 eingeschoben. Die Einstellfeder 29 dient zur Einstellung der Federvorspannung der an der Einstellfeder 29 anliegenden Rückstellfeder 25, die sich wiederum mit ihrer gegenüberliegenden Seite an der Ventilnadel 14 abstützt, wobei auch eine Einstellung der dynamischen Abspritzmenge mit der Einstellfeder 29 erfolgt. Das Einstellelement kann auch anstelle einer Einstellfeder als Einstellbolzen, Einstellhülse usw. ausgeführt sein.In a concentric with the valve longitudinal axis 10 extending flow bore 28 of the core 2, which serves to supply the fuel in the direction of the valve seat surface 16, except the return spring 25 is an adjusting element in the form a set spring 29 is inserted. The adjusting spring 29 is used to adjust the spring preload applied to the adjusting spring 29 return spring 25, which in turn is supported with its opposite side to the valve needle 14, wherein an adjustment of the dynamic Abspritzmenge with the adjusting spring 29. The adjusting element may also be designed instead of a setting spring as an adjusting bolt, adjusting sleeve, etc.

Das bis hierher beschriebene Einspritzventil zeichnet sich durch seinen besonders kompakten Aufbau aus, so dass ein sehr kleines, handliches Einspritzventil entsteht. Diese Bauteile bilden eine vormontierte eigenständige Baugruppe, die nachfolgend Funktionsteil 30 genannt wird. Das Funktionsteil 30 umfasst also im wesentlichen den elektromagnetischen Kreis 1, 2, 5 sowie ein Dichtventil (Ventilschließkörper 19, Ventilsitzkörper 15) mit einem nachfolgenden Strahlaufbereitungselement (Spritzlochscheibe 21).The injector described so far is characterized by its particularly compact design, so that a very small, handy injection valve is created. These components form a preassembled independent assembly, which is called function part 30 below. The functional part 30 therefore essentially comprises the electromagnetic circuit 1, 2, 5 and a sealing valve (valve closing body 19, valve seat body 15) with a subsequent jet treatment element (spray perforated disk 21).

Der zwischen dem Ventilmantel 5 und der Ventilhülse 6 gebildete und durch die Magnetspule 1 fast vollständig ausgefüllte Spulenraum ist in dem Ventilsitzkörper 15 zugewandter Richtung durch einen gestuften Radialbereich 32 des Ventilmantels 5 begrenzt, während der Abschluss auf der dem Ventilsitzkörper 15 abgewandten Seite durch ein scheibenförmiges Abdeckelement 33 gewährleistet ist. In einer Ausnehmung des Abdeckelements 33 wird dieses von dem Spulenkörper 3 durchragt. In diesem Bereich stehen beispielsweise zwei Kontaktstifte 34 aus dem Kunststoff des Spulenkörpers 3 heraus. Über die elektrischen Kontaktstifte 34 erfolgt die elektrische Kontaktierung der Magnetspule 1 und damit deren Erregung.The coil space formed between the valve jacket 5 and the valve sleeve 6 and almost completely filled by the magnetic coil 1 is limited in the valve seat body 15 facing direction by a stepped radial portion 32 of the valve shell 5, while the conclusion on the valve seat body 15 side facing away by a disc-shaped cover 33 is guaranteed. In a recess of the cover 33 this is penetrated by the bobbin 3. In this area, for example, two pins 34 are made of the plastic of the bobbin 3 out. About the electrical contact pins 34, the electrical contacting of the magnetic coil 1 and thus the excitation.

Völlig unabhängig vom Funktionsteil 30 wird eine zweite Baugruppe hergestellt, die im folgenden als Anschlussteil 40 bezeichnet wird. Das Anschlussteil 40 zeichnet sich vor allen Dingen dadurch aus, dass es den elektrischen und den hydraulischen Anschluss des Brennstoffeinspritzventils umfasst. Das weitgehend als Kunststoffteil ausgeführte Anschlussteil 40 besitzt deshalb einen als Brennstoffeinlassstutzen dienenden rohrförmigen Grundkörper 42. In eine konzentrisch zur Ventillängsachse 10 verlaufende Strömungsbohrung 43 eines inneren Rohres 44 im Grundkörper 42, die von dem zuströmseitigen Ende des Brennstoffeinspritzventils aus in axialer Richtung vom Brennstoff durchströmt wird, ist beispielsweise ein Brennstofffilter 45 eingeschoben oder eingepresst.Completely independent of the functional part 30, a second assembly is produced, which is referred to below as the connection part 40. The connection part 40 is characterized above all by the fact that it comprises the electrical and the hydraulic connection of the fuel injection valve. The largely designed as a plastic part connector 40 therefore has a fuel inlet nozzle serving as a tubular body 42. In a concentric with the valve longitudinal axis 10 extending flow bore 43 of an inner tube 44 in the base body 42, which is flowed through from the inflow end of the fuel injection valve in the axial direction of the fuel For example, a fuel filter 45 is inserted or pressed.

Eine hydraulische Verbindung von Anschlussteil 40 und Funktionsteil 30 wird beim vollständig montierten Brennstoffeinspritzventil dadurch erreicht, dass die Strömungsbohrungen 43 und 28 beider Baugruppen so zueinander gebracht werden, dass ein ungehindertes Durchströmen des Brennstoffs gewährleistet ist. Eine innere Öffnung 46 im Abdeckelement 33 erlaubt es, die Ventilhülse 6 und somit auch den Kern 2 so auszubilden, dass beide die Öffnung 46 durchragen und zumindest die Ventilhülse 6 in Richtung zum Anschlussteil 40 deutlich über das Abdeckelement 33 hinaussteht. Bei der Montage des Anschlussteils 40 an dem Funktionsteil 30 ragt ein unteres Ende 47 des Rohres 44 in den überstehenden Teil der Ventilhülse 6 zur Erhöhung der Verbindungsstabilität in die Öffnung 11 der Ventilhülse 6 hinein. Der Grundkörper 42 sitzt im montierten Zustand beispielsweise auf dem Abdeckelement 33 und dem oberen Ende des Ventilmantels 5 auf.A hydraulic connection of connecting part 40 and functional part 30 is achieved in the fully assembled fuel injection valve in that the flow holes 43 and 28 of both modules are brought to each other so that an unimpeded flow through the fuel is ensured. An inner opening 46 in the cover 33 allows the valve sleeve 6 and thus also the core 2 to be formed such that both project through the opening 46 and at least the valve sleeve 6 projects clearly beyond the cover element 33 in the direction of the connection part 40. When mounting the connection part 40 on the functional part 30, a lower end 47 of the tube 44 projects into the protruding part of the valve sleeve 6 to increase the connection stability into the opening 11 of the valve sleeve 6. The main body 42 sits in the mounted state, for example on the cover 33 and the upper end of the valve shell 5.

Außerdem sind im Anschlussteil 40 zwei elektrische Kontaktelemente 55 vorgesehen, die während des Kunststoffspritzgussprozesses des Grundkörpers 42 umspritzt werden und nachfolgend im Kunststoff eingebettet vorliegen. Zu dem Grundkörper 42 gehört auch ein mitangespritzter elektrischer Anschlussstecker 56. Die elektrischen Kontaktelemente 55 enden an ihrem einen Ende als freiliegende Kontaktpins des elektrischen Anschlusssteckers 56, der mit einem entsprechenden nicht gezeigten elektrischen Anschlusselement, wie z. B. einer Kontaktleiste, zur vollständigen elektrischen Kontaktierung des Einspritzventils verbunden werden kann. An ihrem dem Anschlussstecker 56 gegenüberliegenden Ende bilden die Kontaktelemente 55 eine elektrische Verbindung mit den korrespondierenden Kontaktstiften 34.In addition, two electrical contact elements 55 are provided in the connection part 40, which during the Plastic injection molding process of the body 42 are injected and subsequently embedded embedded in the plastic. To the base body 42 includes a mitangespritzter electrical connector 56. The electrical contact elements 55 terminate at one end as exposed contact pins of the electrical connector plug 56, which is connected to a corresponding electrical connection element, not shown, such. B. a contact strip, can be connected for complete electrical contacting of the injector. At their end opposite the connection plug 56, the contact elements 55 form an electrical connection with the corresponding contact pins 34.

In der Figur 2 ist eine Ventilbaugruppe des gesamten Brennstoffeinspritzventils dargestellt, wobei diese Ventilbaugruppe im wesentlichen von der Ventilhülse 6 und den festen sowie axial beweglichen Bauteilen innerhalb der Ventilhülse 6 gebildet wird. Wie Figur 2 zu entnehmen ist, taucht der Kern 2 vollständig in die Ventilhülse 6 ein, was bedeutet, dass er über seine gesamte axiale Erstreckungslänge in Umfangsrichtung von der Ventilhülse 6 umgeben ist. Die vollständig eine Dichtheit nach außen hin garantierende Ventilhülse 6 ermöglicht es, einen Kern 2 einzusetzen, der mittels Rollen bzw. Biegen herstellbar ist.In the FIG. 2 a valve assembly of the entire fuel injection valve is shown, said valve assembly is essentially formed by the valve sleeve 6 and the fixed and axially movable components within the valve sleeve 6. As FIG. 2 can be seen, the core 2 completely immersed in the valve sleeve 6, which means that it is surrounded over its entire axial extension length in the circumferential direction of the valve sleeve 6. The valve sleeve 6, which completely ensures a tightness towards the outside, makes it possible to use a core 2 which can be produced by means of rollers or bending.

Der Kern 2 ist erfindungsgemäß aus einem metallischen Streifen mit einer gleichmäßigen Dicke gefertigt, der entsprechend den erforderlichen Maßen in Form eines Vierecks, insbesondere eines Rechtecks, aus einem Blech ausgestanzt ist und anschließend etwa unter Zuhilfenahme eines dornförmigen Werkzeugs in die gewünschte Form gerollt bzw. gebogen ist, so dass er letztlich einen kreisringförmigen Querschnitt aufweist. Dabei bilden die beiden in Bewegungsrichtung des Kerns 2 verlaufenden Streifenenden 61, 62 einen sich axial erstreckenden Längsschlitz 63, da sie mit einem geringfügigen Abstand einander gegenüberliegen, wie Figur 3 als Draufsicht auf den Kern 2 zeigt.The core 2 is made according to the invention of a metallic strip with a uniform thickness, which is stamped out of a plate according to the required dimensions in the form of a quadrilateral, in particular a rectangle and then rolled or bent about with the aid of a mandrel-shaped tool in the desired shape is, so that it ultimately has a circular cross-section. The two form in the direction of movement of the core 2 Strip ends 61, 62 have an axially extending longitudinal slot 63, as they face each other at a slight distance, such as FIG. 3 as a plan view of the core 2 shows.

Ein derartig ausgeformter Kern 2 weist mehrere Vorteile gegenüber den bekannten als Drehteile ausgebildeten Kernen in Brennstoffeinspritzventilen auf. Bei dem Rollen bzw. Biegen handelt es sich um ein vergleichsweise einfaches und kostengünstiges Herstellungsverfahren mit relativ geringem Materialaufwand. Durch den axial verlaufenden Längsschlitz 63 des Kerns 2 ergibt sich eine Reduzierung der Wirbelströme, wodurch eine höhere Effizienz des Magnetkreises erzielt wird.Such a shaped core 2 has several advantages over the known formed as a rotating parts cores in fuel injection valves. When rolling or bending is a relatively simple and inexpensive manufacturing process with relatively little cost of materials. By the axially extending longitudinal slot 63 of the core 2 results in a reduction of the eddy currents, whereby a higher efficiency of the magnetic circuit is achieved.

Außerdem wird die Montage des Kerns 2 in der Ventilhülse 6 sowie die Hubeinstellung mit Hilfe des Kerns 2 deutlich vereinfacht. Der Kern 2 weist nach dem Rollen bzw. Biegen einen Außendurchmesser auf, der geringfügig größer ist als der Durchmesser der Öffnung 11 der Ventilhülse 6. Somit steht der Kern 2 einerseits von vornherein unter einer radialen Vorspannung, die den Kern 2 einfach in der Ventilhülse 6 fixieren lässt. Andererseits ist der Kern 2 aufgrund seines Längsschlitzes 63 in geringer Weise radial in seiner Größe veränderbar, so dass beim Einschieben des Kerns 2 in die Ventilhülse 6 in vorteilhafter Weise eine Gratbildung vermieden wird. Entsprechend einfach kann der Kern 2 auch zur Hubeinstellung der Ventilnadel 14 in der Ventilhülse 6 mit einem Einstellwerkzeug verschoben werden.In addition, the assembly of the core 2 in the valve sleeve 6 and the stroke adjustment by means of the core 2 is significantly simplified. The core 2 has after rolling or bending to an outer diameter which is slightly larger than the diameter of the opening 11 of the valve sleeve 6. Thus, the core 2 is on the one hand from the outset under a radial bias, the core 2 simply in the valve sleeve. 6 fix it. On the other hand, the core 2 is due to its longitudinal slot 63 in a small way radially variable in size, so that when inserting the core 2 in the valve sleeve 6 advantageously a burr formation is avoided. Correspondingly simple, the core 2 can also be moved to the stroke adjustment of the valve needle 14 in the valve sleeve 6 with a setting tool.

Wie in Figur 2 angedeutet ist, ist es vorteilhaft, nahe einer stromaufwärtigen Stirnfläche 64 des Kerns 2 einen Absatz 65 in der Ventilhülse 6 vorzusehen. Stromaufwärts des Absatzes 65 weist die Ventilhülse 6 einen größeren Durchmesser auf als stromabwärts des Absatzes 65, also in dem Bereich, in dem der Kern 2 in der Öffnung 11 eingebracht ist. Beim axialen Verschieben des Kerns 2 zur Einstellung des Hubes greift ein Einstellwerkzeug z.B. derart am Kern 2 und an der Ventilhülse 6 an, dass einerseits eine Kraft in stromabwärtiger Richtung auf den Kern 2 und andererseits eine Gegenkraft in stromaufwärtiger Richtung auf den Absatz 65 der Ventilhülse 6 aufgebracht werden, wodurch eine kraftschlüssige Verbindung zwischen der Ventilhülse 6 und dem Kern 2 erzielt wird. Pfeile mit dem Formelzeichen F symbolisieren in Figur 2 diese Kraftwirkung.As in FIG. 2 is indicated, it is advantageous to provide a shoulder 65 in the valve sleeve 6 near an upstream end face 64 of the core 2. Upstream of paragraph 65, the valve sleeve 6 has a larger diameter than downstream of the shoulder 65, ie in the area in which the core 2 is inserted in the opening 11. During axial displacement of the core 2 for adjusting the stroke, an adjustment tool engages, for example, on the core 2 and on the valve sleeve 6, such that, on the one hand, a force in the downstream direction on the core 2 and, on the other hand, a counterforce in the upstream direction on the shoulder 65 of the valve sleeve 6 be applied, whereby a positive connection between the valve sleeve 6 and the core 2 is achieved. Arrows with the symbol F symbolize in FIG. 2 this force effect.

Claims (6)

  1. Fuel injection valve for fuel injection systems of internal combustion engines, having an electromagnetic operating element which comprises at least one magnet coil (1), a tubular inner pole (2) and an outer magnetic circuit component (5), having a valve sleeve (6) which has an inner opening (11), having a valve-closing body (19) which interacts with a valve seat (16) which is associated with a valve seat body (15), with the valve seat body (15) and the inner pole (2) being fixedly arranged, and the valve-closing body (19) being moveably arranged, in the inner opening (11) in the valve sleeve (6),
    characterized
    in that the inner pole (2) is in the form of a metal strip which is rolled or bent in the form of a ring, with the strip ends (61, 62) of the inner pole (2) which run in the movement direction of the inner pole during the rolling or bending process being situated opposite and at a distance from one another so as to form a longitudinal slot (63) in the installed state.
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the inner pole (2) is surrounded over its entire axial length of extent in the circumferential direction by the valve sleeve (6).
  3. Fuel injection valve according to Claim 1,
    characterized
    in that the inner pole (2) has an upstream end face (64) and a shoulder (65) is provided in the valve sleeve (6) close to the end face (64).
  4. Fuel injection valve according to Claim 3,
    characterized
    in that the valve sleeve (6) has a larger diameter upstream of the shoulder (65) than in the region of the valve sleeve (6) in which the inner pole (2) is inserted.
  5. Fuel injection valve according to Claim 1,
    characterized
    in that the valve-closing body (19) is part of an axially moveable valve needle (14) and the movement path of the valve needle (14) can be adjusted by displacing the inner pole (2).
  6. Fuel injection valve according to Claim 1,
    characterized
    in that the inner pole (2) is connected to the valve sleeve (6) in a force-fitting manner.
EP99955826A 1999-01-08 1999-10-01 Fuel injector Expired - Lifetime EP1062421B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19900406 1999-01-08
DE19900406A DE19900406A1 (en) 1999-01-08 1999-01-08 Fuel injector
PCT/DE1999/003157 WO2000040855A1 (en) 1999-01-08 1999-10-01 Fuel injector

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EP1062421A1 EP1062421A1 (en) 2000-12-27
EP1062421B1 true EP1062421B1 (en) 2008-03-05

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US (1) US6679435B1 (en)
EP (1) EP1062421B1 (en)
JP (1) JP4597376B2 (en)
KR (1) KR20010052203A (en)
DE (2) DE19900406A1 (en)
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US6679435B1 (en) 2004-01-20
KR20010052203A (en) 2001-06-25
DE59914674D1 (en) 2008-04-17
DE19900406A1 (en) 2000-07-13
JP4597376B2 (en) 2010-12-15
EP1062421A1 (en) 2000-12-27
JP2002534638A (en) 2002-10-15
WO2000040855A1 (en) 2000-07-13

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