EP1062421A1 - Fuel injector - Google Patents

Fuel injector

Info

Publication number
EP1062421A1
EP1062421A1 EP99955826A EP99955826A EP1062421A1 EP 1062421 A1 EP1062421 A1 EP 1062421A1 EP 99955826 A EP99955826 A EP 99955826A EP 99955826 A EP99955826 A EP 99955826A EP 1062421 A1 EP1062421 A1 EP 1062421A1
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.)
Granted
Application number
EP99955826A
Other languages
German (de)
French (fr)
Other versions
EP1062421B1 (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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of 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

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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 injector according to the preamble of claim 1.
  • an electromagnetically actuated fuel injection valve which, among other things, has a non-magnetic sleeve as a 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 runs over its entire axial length with a constant outside diameter and a constant inside diameter and accordingly has inlet openings of the same size at both ends.
  • the core and the valve seat body are designed with an outer diameter such 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 protruding areas.
  • a valve needle with an armature moves in the axial direction, which is guided through the sleeve.
  • the fixed connections of the sleeve to the core and the valve seat body are, for. B. achieved by welding. With The volume and weight of the fuel injector can be reduced with the help of the tubular sleeve.
  • a fuel injector which has an elongated, thin-walled, non-magnetic sleeve which, in addition to its jacket section, also has a bottom section.
  • the bottom section runs largely perpendicular to the otherwise axial extension of the sleeve along the longitudinal axis of the valve.
  • A can be in a through opening of the sleeve
  • a valve closing body which is fixedly connected to the valve needle interacts with a valve seat surface provided on a valve seat body, the valve seat body being pressed into the sleeve and directly or indirectly abutting the bottom portion of the sleeve with a perforated disk.
  • a tubular core serving as an inner pole is arranged in the through opening of the sleeve and is designed as a turned part. The core is firmly connected to the sleeve in a desired position by welding.
  • a similar arrangement of a tubular core in a valve sleeve is also known from DE-OS 197 12 590.
  • Magnetic cores for fuel injectors are produced by machining surface removal, with turning, milling, drilling and finishing steps being the known methods for producing these magnetic cores.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that it can be manufactured in a very simple manner is mountable. Rolling or bending is a comparatively simple and inexpensive manufacturing process with relatively little material.
  • the inner pole is advantageously produced from a simple metallic strip.
  • the strip results in an axially running longitudinal slot on the inner pole, which in turn results in a reduction in the eddy currents, as a result of which a higher efficiency of the magnetic circuit is achieved.
  • the assembly of the inner pole in the valve sleeve and the stroke adjustment with the help of the inner pole are significantly simplified.
  • the inner pole After rolling or bending, the inner pole is on the one hand from the outset under a radial preload, which allows the inner pole to be simply fixed in the valve sleeve.
  • the size of the inner pole can be changed radially due to its longitudinal slot, so that burr formation is advantageously avoided when the inner pole is inserted into the valve sleeve.
  • the inner pole can also be moved correspondingly simply for adjusting the stroke of a valve needle in the valve sleeve using an adjusting tool.
  • the valve sleeve advantageously has a shoulder near the inner pole, on which an adjusting tool can act as well as on the inner pole.
  • FIG. 1 shows a fuel injection valve with an inner pole according to the invention
  • FIG. 2 shows the valve assembly having the inner pole on a changed scale
  • FIG. 3 shows a plan view of the inner pole.
  • the electromagnetically actuated valve according to the invention in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2 surrounded by a magnet coil 1, serving as an inner pole and partly as a fuel flow , sleeve-shaped and stepped, z.
  • the magnet coil 1, the core 2 and the valve jacket 5 together form an electrically excitable actuating element.
  • the core 2 is introduced into an inner opening 11 of the valve sleeve 6, which is concentric with a longitudinal axis 10 of the valve.
  • the ferritic valve sleeve 6, for example, is elongated and thin-walled and has a jacket section 12 and a bottom section 13, the jacket section 12 in the circumferential direction and the bottom section 13 in the axial direction at its downstream end opening 11 limit.
  • the opening 11 also serves as a guide opening for a valve needle 14 that is axially movable along the longitudinal axis 10 of the valve.
  • valve seat body 15 which e.g. sits on the bottom section 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 section 17, a likewise tubular needle section 18 and a spherical valve closing body 19, the
  • Valve closing body 19 e.g. is firmly connected to the needle section 18 by means of a weld seam.
  • On the downstream end of the valve seat body 15 is, for. B. in a frustoconical recess 20 a flat spray washer 21 is arranged, the fixed connection of valve seat body 15 and spray orifice plate 21 z. B. is realized by a circumferential dense weld.
  • One or more transverse openings 22 are provided in the needle section 18 of the valve needle 14, so that fuel flowing through the armature section 17 in an inner longitudinal bore 23 escapes and, e.g. can flow along flats 24 to the valve seat surface 16.
  • the injection valve is actuated electromagnetically in a known manner.
  • the electromagnetic circuit with the magnet coil 1, the inner core 2, the outer valve jacket 5 and the armature section 17 is used Anchor section 17 is with the Valve closing body 19 facing away from the core 2.
  • the spherical valve closing body 19 acts with the conically tapering in the direction of flow
  • Valve seat surface 16 of the valve seat body 15 together, which is formed in the axial direction downstream of a guide opening in the valve seat body 15.
  • the spray hole disk 21 has at least one, for example four, spray openings 27 formed by eroding, laser drilling or punching.
  • the insertion depth of the core 2 in the injection valve is, among other things, decisive for the stroke of the valve needle 14.
  • the one end position of the valve needle 14 when the magnet coil 1 is not energized is determined by the valve closing body 19 resting against the valve seat surface 16 of the valve seat body 15, while the other The end position of the valve needle 14 when the solenoid coil 1 is excited results from the contact of the armature section 17 at the downstream core end.
  • the stroke is adjusted by axially displacing the core 2 in the valve sleeve 6, which is firmly connected to the valve sleeve 6 in accordance with the desired position.
  • the core 2 has a small diameter compared to the inner diameter of the valve sleeve 6
  • the fixation of the core 2 and thus the setting of the valve needle stroke is therefore preferably self-locking.
  • the core 2 can also be attached to the valve sleeve 6 with a weld spot or a circumferential weld seam.
  • adjusting element in the form in a flow bore 28 of the core 2, which runs concentrically to the valve longitudinal axis 10 and serves to supply the fuel in the direction of the valve seat surface 16 an adjusting spring 29 inserted.
  • the adjusting spring 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting spring 29, which in turn is supported with its opposite side on the valve needle 14, the dynamic spray quantity also being adjusted using the adjusting spring 29.
  • the adjusting element can also be designed as an adjusting bolt, adjusting sleeve etc. instead of an adjusting spring.
  • the injection valve described so far is characterized by its particularly compact design, so that a very small, handy injection valve is created.
  • These components form a pre-assembled, independent assembly, which is referred to below as functional part 30.
  • the functional part 30 thus essentially comprises the electromagnetic circuit 1, 2, 5 and a sealing valve (valve closing body 19, valve seat body 15) with a subsequent jet processing element (spray hole disk 21).
  • the coil space formed between the valve jacket 5 and the valve sleeve 6 and almost completely filled by the magnet coil 1 is limited in the direction facing the valve seat body 15 by a stepped radial region 32 of the valve jacket 5, while the closure on the side facing away from the valve seat body 15 is limited by a disk-shaped cover element 33 is guaranteed.
  • the coil body 3 extends through it in a recess in the cover element 33. In this area, for example, two contact pins 34 protrude from the plastic of the coil former 3.
  • the electrical contacting of the magnetic coil 1 and thus its excitation takes place via the electrical contact pins 34.
  • a second assembly is produced, which is referred to below as the connecting part 40.
  • the connecting part 40 is characterized above all by the fact that it comprises the electrical and the hydraulic connection of the fuel injector.
  • the connection part 40 which is largely designed as a plastic part, therefore has an as
  • a fuel filter 45 is inserted or pressed into a flow bore 43 of an inner tube 44 in the base body 42, which runs concentrically to the longitudinal axis 10 of the valve and through which the fuel flows in the axial direction from the inflow end of the fuel injection valve.
  • connection part 40 and functional part 30 are achieved in the fully assembled fuel injection valve in that the flow bores 43 and 28 of both assemblies are brought together so that an unimpeded flow of fuel is ensured.
  • An inner opening 46 in the cover element 33 allows the valve sleeve 6 and thus also the core 2 to be designed such that both protrude through the opening 46 and at least the valve sleeve 6 projects significantly beyond the cover element 33 in the direction of the connecting part 40.
  • a lower end 47 of the tube 44 projects into the projecting part of the valve sleeve 6 to increase the connection stability into the opening 11 of the valve sleeve 6.
  • the base body 42 sits, for example, on the cover element 33 and the upper end of the valve jacket 5.
  • the base body 42 also includes an integrally molded electrical connector 56.
  • the electrical contact elements 55 end at one end as exposed contact pins of the electrical connector 56, which are connected to a corresponding electrical connector, not shown, such as, for. B. a contact strip, can be connected for complete electrical contacting of the injection valve.
  • the contact elements 55 form an electrical connection with the corresponding contact pins 34.
  • FIG. 2 shows a valve assembly of the entire fuel injection valve, this valve assembly being essentially formed by the valve sleeve 6 and the fixed and axially movable components within the valve sleeve 6.
  • the core 2 is completely immersed in the valve sleeve 6, which means that it is surrounded by the valve sleeve 6 over its entire axial length in the circumferential direction.
  • the valve sleeve 6, which guarantees complete tightness to the outside, makes it possible to use a core 2 which can be produced by rolling or bending.
  • the core 2 is made according to the invention from a metallic strip with a uniform thickness, which is punched out of sheet metal in the form of a square, in particular a rectangle, and then rolled or bent into the desired shape, for example with the aid of a mandrel-shaped tool is, so that it ultimately has an annular cross section.
  • Strip ends 61, 62 have an axially extending longitudinal slot 63, since they lie opposite one another at a slight distance, as FIG. 3 shows as a top view of the core 2.
  • a core 2 shaped in this way has several advantages over the known cores in fuel injection valves which are designed as turned parts. Rolling or bending is a comparatively simple and inexpensive manufacturing process with relatively little material.
  • the axial longitudinal slot 63 of the core 2 results in a reduction in the eddy currents, as a result of which a higher efficiency of the magnetic circuit is achieved.
  • the assembly of the core 2 in the valve sleeve 6 and the stroke adjustment with the aid of the core 2 is significantly simplified.
  • the core 2 After rolling or bending, the core 2 has an outer diameter that is slightly larger than the diameter of the opening 11 of the valve sleeve 6.
  • the core 2 is radially preloaded from the outset, which simply places the core 2 in the valve sleeve 6 can be fixed.
  • the size of the core 2 can be changed radially to a small extent, so that when the core 2 is inserted into the valve sleeve 6, burr formation is advantageously avoided.
  • the core 2 can also be moved correspondingly simply for adjusting the stroke of the valve needle 14 in the valve sleeve 6 with an adjusting 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. Upstream of the shoulder 65, the valve sleeve 6 has a larger diameter than downstream of the shoulder 65, that is to say in the area in which the core 2 is introduced into the opening 11.
  • an adjusting tool acts, for example, on the core 2 and the valve sleeve 6 in such a way 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 are applied, whereby a non-positive connection between the valve sleeve 6 and the core 2 is achieved.
  • Arrows with the formula symbol F symbolize this force effect in FIG. 2.

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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)

Abstract

The invention relates to a fuel injector for fuel injection systems of internal combustion engines. Said fuel injector comprises an electromagnetic actuating element with a magnet coil (1), a tubular inner pole (2) and an outer magnetic circuit component (5), a thin-walled valve sleeve (6) having an inner opening (11) and a mobile valve closing body (19) which cooperates with a valve seat (16) which is assigned to a valve seat body (15). The valve seat body (15) and inner pole (2) are fixedly positioned in the inner opening (11) of the valve sleeve (6). The inner pole (2) has a longitudinal slit (63) which is formed by the production of said pole by rolling or bending.

Description

BrennstoffeinspritzventilFuel injector
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 injector 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 US Pat. No. 4,946,107, an electromagnetically actuated fuel injection valve is already known, which, among other things, has a non-magnetic sleeve as a 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 runs over its entire axial length with a constant outside diameter and a constant inside diameter and accordingly has inlet openings of the same size at both ends. The core and the valve seat body are designed with an outer diameter such 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 protruding areas. Inside the sleeve, a valve needle with an armature moves in the axial direction, which is guided through the sleeve. The fixed connections of the sleeve to the core and the valve seat body are, for. B. achieved by welding. With The volume and weight of the fuel injector can be reduced with the help of the tubular sleeve.
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 eineAlso known from DE-OS 195 47 406 is a fuel injector which has an elongated, thin-walled, non-magnetic sleeve which, in addition to its jacket section, also has a bottom section. The bottom section runs largely perpendicular to the otherwise axial extension of the sleeve along the longitudinal axis of the valve. A can be in a through opening of the sleeve
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.Move valve needle axially. A valve closing body which is fixedly connected to the valve needle interacts with a valve seat surface provided on a valve seat body, the valve seat body being pressed into the sleeve and directly or indirectly abutting the bottom portion of the sleeve with a perforated disk. In addition to the axially movable valve needle and the valve seat body, a tubular core serving as an inner pole is arranged in the through opening of the sleeve and is designed as a turned part. The core is firmly connected to the sleeve in a desired position by welding. A similar arrangement of a tubular core in a valve sleeve is also known from DE-OS 197 12 590.
Üblicherweise werden derartige als Innenpole dienendeSuch are usually used as inner poles
Magnetkerne für Brennstoffeinspritzventile durch spanendes Oberflächenabtragen hergestellt, wobei Drehen, Fräsen, Bohren und Feinbearbeitungsschritte die bekannten Verfahren zur Herstellung dieser Magnetkerne sind.Magnetic cores for fuel injectors are produced by machining surface removal, with turning, milling, drilling and finishing steps being the known methods for producing these magnetic cores.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden 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 injector according to the invention with the characterizing features of claim 1 has the advantage that it can be manufactured in a very simple manner is mountable. Rolling or bending is a comparatively simple and inexpensive manufacturing process with relatively little material.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.Advantageous further developments and improvements of the fuel injector specified in claim 1 are possible through the measures listed in the subclaims.
In vorteilhafter Weise wird der Innenpol aus einem einfachen metallischen Streifen hergestellt. Durch das Rollen diesesThe inner pole is advantageously produced from a simple metallic strip. By rolling this
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 strip results in an axially running longitudinal slot on the inner pole, which in turn results in a reduction in the eddy currents, as a result of which a higher efficiency of the magnetic circuit is achieved.
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 assembly of the inner pole in the valve sleeve and the stroke adjustment with the help of the inner pole are significantly simplified. After rolling or bending, the inner pole is on the one hand from the outset under a radial preload, which allows the inner pole to be simply fixed in the valve sleeve. On the other hand, the size of the inner pole can be changed radially due to its longitudinal slot, so that burr formation is advantageously avoided when the inner pole is inserted into the valve sleeve.
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 .The inner pole can also be moved correspondingly simply for adjusting the stroke of a valve needle in the valve sleeve using an adjusting tool. For this purpose, the valve sleeve advantageously has a shoulder near the inner pole, on which an adjusting tool can act as well as on the inner pole.
Auf diese Weise ist eine kraftschlüssige Verbindung zwischen der Ventilhülse und dem Innenpol erzielbar. ZeichnungIn this way, a non-positive connection between the valve sleeve and the inner pole can be achieved. drawing
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. FIG. 1 shows a fuel injection valve with an inner pole according to the invention, FIG. 2 shows the valve assembly having the inner pole on a changed scale, and FIG. 3 shows 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.The electromagnetically actuated valve according to the invention, shown by way of example in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2 surrounded by a magnet coil 1, serving as an inner pole and partly as a fuel flow , sleeve-shaped and stepped, z. B. ferromagnetic valve jacket 5, which represents an outer pole or an outer magnetic circuit component, completely surrounded in the circumferential direction. The magnet coil 1, the core 2 and the valve jacket 5 together form an electrically excitable actuating element.
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 the magnet coil 1 embedded in a coil former 3 surrounds a valve sleeve 6 from the outside, the core 2 is introduced into an inner opening 11 of the valve sleeve 6, which is concentric with a longitudinal axis 10 of the valve. The ferritic valve sleeve 6, for example, is elongated and thin-walled and has a jacket section 12 and a bottom section 13, the jacket section 12 in the circumferential direction and the bottom section 13 in the axial direction at its downstream end opening 11 limit. The opening 11 also serves as a guide opening for a valve needle 14 that is axially movable along the longitudinal axis 10 of the valve.
Neben dem Kern 2 und der Ventilnadel 14 ist in der ÖffnungIn addition to the core 2 and the valve needle 14 is in the opening
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 der11 further arranged a valve seat body 15 which e.g. sits on the bottom section 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 section 17, a likewise tubular needle section 18 and a spherical valve closing body 19, the
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.Valve closing body 19 e.g. is firmly connected to the needle section 18 by means of a weld seam. On the downstream end of the valve seat body 15 is, for. B. in a frustoconical recess 20 a flat spray washer 21 is arranged, the fixed connection of valve seat body 15 and spray orifice plate 21 z. B. is realized by a circumferential dense weld. One or more transverse openings 22 are provided in the needle section 18 of the valve needle 14, so that fuel flowing through the armature section 17 in an inner longitudinal bore 23 escapes and, e.g. can flow along flats 24 to the valve seat surface 16.
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 injection valve is actuated electromagnetically in a known manner. For the axial movement of the valve needle 14 and thus for opening against the spring force of a return spring 25 acting on the valve needle 14 or closing the injection valve, the electromagnetic circuit with the magnet coil 1, the inner core 2, the outer valve jacket 5 and the armature section 17 is used Anchor section 17 is with the Valve closing body 19 facing away from the core 2.
Der kugelförmige Ventilschließkörper 19 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngendenThe spherical valve closing body 19 acts with the conically tapering in the direction of flow
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.Valve seat surface 16 of the valve seat body 15 together, which is formed in the axial direction downstream of a guide opening in the valve seat body 15. The spray hole disk 21 has at least one, for example four, spray openings 27 formed by eroding, 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 geringesThe insertion depth of the core 2 in the injection valve is, among other things, decisive for the stroke of the valve needle 14. The one end position of the valve needle 14 when the magnet coil 1 is not energized is determined by the valve closing body 19 resting against the valve seat surface 16 of the valve seat body 15, while the other The end position of the valve needle 14 when the solenoid coil 1 is excited results from the contact of the armature section 17 at the downstream core end. The stroke is adjusted by axially displacing the core 2 in the valve sleeve 6, which is firmly connected to the valve sleeve 6 in accordance with the desired position. For this purpose, the core 2 has a small diameter compared to the inner diameter of the valve sleeve 6
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.Excess. The fixation of the core 2 and thus the setting of the valve needle stroke is therefore preferably self-locking. Alternatively, the core 2 can also be attached to the valve sleeve 6 with a weld spot 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 addition to the return spring 25, there is an adjusting element in the form in a flow bore 28 of the core 2, which runs concentrically to the valve longitudinal axis 10 and serves to supply the fuel in the direction of the valve seat surface 16 an adjusting spring 29 inserted. The adjusting spring 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting spring 29, which in turn is supported with its opposite side on the valve needle 14, the dynamic spray quantity also being adjusted using the adjusting spring 29. The adjusting element can also be designed as an adjusting bolt, adjusting sleeve etc. instead of an adjusting spring.
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 injection valve described so far is characterized by its particularly compact design, so that a very small, handy injection valve is created. These components form a pre-assembled, independent assembly, which is referred to below as functional part 30. The functional part 30 thus essentially comprises the electromagnetic circuit 1, 2, 5 and a sealing valve (valve closing body 19, valve seat body 15) with a subsequent jet processing element (spray hole 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. 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 alsThe coil space formed between the valve jacket 5 and the valve sleeve 6 and almost completely filled by the magnet coil 1 is limited in the direction facing the valve seat body 15 by a stepped radial region 32 of the valve jacket 5, while the closure on the side facing away from the valve seat body 15 is limited by a disk-shaped cover element 33 is guaranteed. The coil body 3 extends through it in a recess in the cover element 33. In this area, for example, two contact pins 34 protrude from the plastic of the coil former 3. The electrical contacting of the magnetic coil 1 and thus its excitation takes place via the electrical contact pins 34. Completely independently of the functional part 30, a second assembly is produced, which is referred to below as the connecting part 40. The connecting part 40 is characterized above all by the fact that it comprises the electrical and the hydraulic connection of the fuel injector. The connection part 40, which is largely designed as a plastic part, therefore has an as
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.A fuel filter 45 is inserted or pressed into a flow bore 43 of an inner tube 44 in the base body 42, which runs concentrically to the longitudinal axis 10 of the valve and through which the fuel flows in the axial direction from the inflow end of the fuel injection valve.
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 connection part 40 and functional part 30 is achieved in the fully assembled fuel injection valve in that the flow bores 43 and 28 of both assemblies are brought together so that an unimpeded flow of fuel is ensured. An inner opening 46 in the cover element 33 allows the valve sleeve 6 and thus also the core 2 to be designed such that both protrude through the opening 46 and at least the valve sleeve 6 projects significantly beyond the cover element 33 in the direction of the connecting part 40. When the connecting part 40 is mounted on the functional part 30, a lower end 47 of the tube 44 projects into the projecting part of the valve sleeve 6 to increase the connection stability into the opening 11 of the valve sleeve 6. In the assembled state, the base body 42 sits, for example, on the cover element 33 and the upper end of the valve jacket 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 connecting part 40, which during the Plastic injection molding process of the base body 42 are encapsulated and subsequently present embedded in the plastic. The base body 42 also includes an integrally molded electrical connector 56. The electrical contact elements 55 end at one end as exposed contact pins of the electrical connector 56, which are connected to a corresponding electrical connector, not shown, such as, for. B. a contact strip, can be connected for complete electrical contacting of the injection valve. At their end opposite the connector 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.FIG. 2 shows a valve assembly of the entire fuel injection valve, this valve assembly being essentially formed by the valve sleeve 6 and the fixed and axially movable components within the valve sleeve 6. As can be seen in FIG. 2, the core 2 is completely immersed in the valve sleeve 6, which means that it is surrounded by the valve sleeve 6 over its entire axial length in the circumferential direction. The valve sleeve 6, which guarantees complete tightness to the outside, makes it possible to use a core 2 which can be produced by rolling 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 from a metallic strip with a uniform thickness, which is punched out of sheet metal in the form of a square, in particular a rectangle, and then rolled or bent into the desired shape, for example with the aid of a mandrel-shaped tool is, so that it ultimately has an annular 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, since they lie opposite one another at a slight distance, as FIG. 3 shows as a top view of the core 2.
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.A core 2 shaped in this way has several advantages over the known cores in fuel injection valves which are designed as turned parts. Rolling or bending is a comparatively simple and inexpensive manufacturing process with relatively little material. The axial longitudinal slot 63 of the core 2 results in a reduction in the eddy currents, as a result of which 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 with the aid of the core 2 is significantly simplified. After rolling or bending, the core 2 has an outer diameter that is slightly larger than the diameter of the opening 11 of the valve sleeve 6. Thus, on the one hand, the core 2 is radially preloaded from the outset, which simply places the core 2 in the valve sleeve 6 can be fixed. On the other hand, due to its longitudinal slot 63, the size of the core 2 can be changed radially to a small extent, so that when the core 2 is inserted into the valve sleeve 6, burr formation is advantageously avoided. The core 2 can also be moved correspondingly simply for adjusting the stroke of the valve needle 14 in the valve sleeve 6 with an adjusting 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 indicated in FIG. 2, 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 the shoulder 65, the valve sleeve 6 has a larger diameter than downstream of the shoulder 65, that is to say in the area in which the core 2 is introduced into the opening 11. When the core 2 is axially displaced to adjust the stroke, an adjusting tool acts, for example, on the core 2 and the valve sleeve 6 in such a way 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 are applied, whereby a non-positive connection between the valve sleeve 6 and the core 2 is achieved. Arrows with the formula symbol F symbolize this force effect in FIG. 2.

Claims

Patentansprüche claims
1. Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen, mit einem elektromagnetischen1. Fuel injection valve for fuel injection systems of internal combustion engines, with an electromagnetic
Betätigungselement, das wenigstens eine Magnetspule (1) , einen rohrförmigen Innenpol (2) und ein äußeres Magnetkreisbauteil (5) umfasst, mit einer eine innere Öffnung (11) aufweisenden Ventilhülse (6), mit einem Ventilschließkörper (19), der mit einem einemActuating element, which comprises at least one magnetic coil (1), a tubular inner pole (2) and an outer magnetic circuit component (5), with a valve sleeve (6) having an inner opening (11), with a valve closing body (19) which is connected to a
Ventilsitzkörper (15) zugeordneten Ventilsitz (16) zusammenwirkt, wobei der Ventilsitzkörper (15) und der Innenpol (2) fest sowie der Ventilschließkörper (19) bewegbar in der inneren Öffnung (11) der Ventilhülse (6) angeordnet sind, dadurch gekennzeichnet, dass der Innenpol (2) mittels Rollen bzw. Biegen hergestellt ist.Valve seat body (15) associated valve seat (16) cooperates, the valve seat body (15) and the inner pole (2) fixed and the valve closing body (19) are arranged movably in the inner opening (11) of the valve sleeve (6), characterized in that the inner pole (2) is made by rolling or bending.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Innenpol (2) als ein kreisförmig gerollter metallischer Streifen ausgebildet ist.2. Fuel injection valve according to claim 1, characterized in that the inner pole (2) is designed as a circular rolled metal strip.
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass die in Bewegungsrichtung des Innenpols (2) verlaufenden Streifenenden (61, 62) des Innenpols (2) einen Längsschlitz (63) bildend mit Abstand einander gegenüberliegen .3. Fuel injection valve according to claim 2, characterized in that the strip ends (61, 62) of the inner pole (2) extending in the direction of movement of the inner pole (2) forming a longitudinal slot (63) at a distance from one another.
4. Brennstoffeinspritzventil nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Innenpol (2) über seine gesamte axiale Erstreckungslänge in4. Fuel injection valve according to one of the preceding claims, characterized in that the inner pole (2) over its entire axial extension length in
Umfangsrichtung von der Ventilhülse (6) umgeben ist.Circumferential direction is surrounded by the valve sleeve (6).
5. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Innenpol (2) eine stromaufwärtige Stirnfläche (64) hat und nahe der Stirnfläche (64) ein Absatz (65) in der Ventilhülse (6) vorgesehen ist.5. Fuel injection valve according to claim 1, characterized in that the inner pole (2) has an upstream end face (64) and near the end face (64) a shoulder (65) is provided in the valve sleeve (6).
6. Brennstoffeinspritzventil nach Anspruch 5, dadurch gekennzeichnet, dass die Ventilhülse (6) stromaufwärts des Absatzes (65) einen größeren Durchmesser aufweist als im Bereich der Ventilhülse (6), in dem der Innenpol (2) eingebracht ist.6. Fuel injection valve according to claim 5, characterized in that the valve sleeve (6) upstream of the shoulder (65) has a larger diameter than in the region of the valve sleeve (6) in which the inner pole (2) is introduced.
7. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Ventilschließkörper (19) Teil einer axial bewegbaren Ventilnadel (14) ist und die Bewegungsstrecke der Ventilnadel (14) durch ein Verschieben des Innenpols (2) einstellbar ist.7. Fuel injection valve according to claim 1, characterized in that the valve closing body (19) is part of an axially movable valve needle (14) and the movement distance of the valve needle (14) is adjustable by moving the inner pole (2).
8. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Innenpol (2) kraftschlüssig mit der Ventilhülse (6) verbunden ist. 8. Fuel injection valve according to claim 1, characterized in that the inner pole (2) is non-positively connected to the valve sleeve (6).
EP99955826A 1999-01-08 1999-10-01 Fuel injector Expired - Lifetime EP1062421B1 (en)

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DE19900406A DE19900406A1 (en) 1999-01-08 1999-01-08 Fuel injector
DE19900406 1999-01-08
PCT/DE1999/003157 WO2000040855A1 (en) 1999-01-08 1999-10-01 Fuel injector

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WO (1) WO2000040855A1 (en)

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Also Published As

Publication number Publication date
KR20010052203A (en) 2001-06-25
JP2002534638A (en) 2002-10-15
WO2000040855A1 (en) 2000-07-13
US6679435B1 (en) 2004-01-20
DE19900406A1 (en) 2000-07-13
EP1062421B1 (en) 2008-03-05
JP4597376B2 (en) 2010-12-15
DE59914674D1 (en) 2008-04-17

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