EP0487916A1 - Method for mounting a filter on a valve - Google Patents

Method for mounting a filter on a valve Download PDF

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Publication number
EP0487916A1
EP0487916A1 EP19910118482 EP91118482A EP0487916A1 EP 0487916 A1 EP0487916 A1 EP 0487916A1 EP 19910118482 EP19910118482 EP 19910118482 EP 91118482 A EP91118482 A EP 91118482A EP 0487916 A1 EP0487916 A1 EP 0487916A1
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EP
European Patent Office
Prior art keywords
valve
filter
circumference
valve body
plastic
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
EP19910118482
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German (de)
French (fr)
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EP0487916B1 (en
Inventor
Udo Dipl.-Ing. Hafner (Fh)
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0487916A1 publication Critical patent/EP0487916A1/en
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Publication of EP0487916B1 publication Critical patent/EP0487916B1/en
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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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/794—With means for separating solid material from the fluid
    • Y10T137/8085—Hollow strainer, fluid inlet and outlet perpendicular to each other

Definitions

  • the invention is based on a method for mounting a filter on the circumference of a valve body delimiting a valve in the radial direction outward, or on a valve according to the preamble of claims 1 and 6, for example.
  • a filter element is pushed onto the valve housing so that the at least one through opening formed on the circumference of the valve housing is covered by the filter fabric in the area of the throughflow openings of the filter element.
  • the filter element is produced by extrusion-coating a filter fabric with plastic in an injection mold.
  • diameter gradations with rounded edges are required on the valve body in order to enable the filter element to be pushed onto the valve body, for example onto the valve housing of the valve.
  • the formation of these diameters increases the manufacturing costs of a valve manufactured in this way.
  • the inventive method for mounting a filter on the circumference of a valve in the radial direction outwardly delimiting valve body with the characterizing features of claim 1 and the valve with the characterizing features of claim 6 have the advantage that the contamination of the valve interior is avoided , since the filter is not pushed onto the valve body, so that no material particles can scrape off.
  • the tightness between the plastic encapsulation serving as a tissue holder and the valve body is achieved by shrinking the plastic encapsulation onto the valve body immediately after the spraying process due to the cooling of the plastic material.
  • Another advantage is that the valve can be manufactured more simply and cost-effectively, since no diameter gradations with rounded edges on the circumference of the valve body are required for mounting the filter.
  • valve body has at least one recess on its circumference, which is filled by the plastic encapsulation. This ensures a secure and reliable hold of the filter on the circumference of the valve body.
  • valve body has at least one flattened portion on its periphery, which is closely surrounded by the plastic encapsulation of the filter. This effectively prevents the filter from rotating around the circumference of the valve body.
  • FIG. 1 shows a first exemplary embodiment of a valve with a filter mounted according to the invention
  • FIG. 2 shows a partial section of the first exemplary embodiment shown in FIG. 1
  • FIG. 3 shows a second
  • FIG. 4 shows a third exemplary embodiment of a valve with a filter mounted according to the invention.
  • valves shown in FIGS. 1 to 4 in the form of electromagnetically actuated fuel injection valves for fuel injection systems of, for example, mixture-compression-ignition internal combustion engines have a filter 1 mounted according to the invention, which is used to filter a fluid supplied to the valve.
  • the same and equivalent parts are identified in the four figures by the same reference numerals.
  • the filter 1 is arranged on the circumference of a tubular nozzle body 5 which limits the valve in the radial direction towards the outside.
  • the nozzle body 5 has at least one, for example two through openings 7 in the form of partially circumferential slots on its circumference, all of which are at least approximately at the same axial height of the nozzle body 5.
  • These through openings 7 serve for supply e.g. of a fuel into the interior of the tubular nozzle body 5.
  • this has at one end an electrical connector 11, which serves to contact a magnetic coil, not shown.
  • a seat body 13 is inserted into a longitudinal opening 14 of the nozzle body 5, which is concentric with a longitudinal valve axis 9.
  • the seat body 13 is connected on its periphery to the wall of the longitudinal opening 14 at its end facing away from the electrical connector 11, for example by a laser weld 16.
  • the seat body 13 has, in the upstream direction, the through openings 7 of the nozzle body 5, a guide bore 15 which runs concentrically to the longitudinal valve axis 9 and in which a ball 17 serving as a valve closing body is slidably mounted. Downstream of the guide bore 15, a fixed valve seat 19 is formed in the seat body 13, which cooperates with the ball 17.
  • the wall of the guide bore 15 is interrupted by fuel channels 21 running in the axial direction, which enable fuel flow to the valve seat 19.
  • Downstream of the valve seat 19, for example, two spray openings 23 are formed in the seat body 13, which spray the fuel into a treatment bore 25 of the seat body 13 which extends concentrically to the longitudinal valve axis 9 and widens in the downstream direction.
  • the ball 17 serving as the valve closing body is connected to the valve seat 19, directly connected to a tubular armature 27, for example by laser welding.
  • the armature 27 interacts with the magnet coil and a core (not shown) of the valve and serves to actuate the valve.
  • a retaining shoulder 31 is formed, on which a return spring 33 is supported, facing the valve seat 19 of the seat body 13.
  • the return spring 33 strives to act as a valve closing body serving ball 17 to move in the direction of its valve seat 19 and thus close the valve.
  • a filter fabric 35 is arranged on the circumference of the nozzle body 5 in a first method step according to the invention such that the two through openings 7 of the nozzle body 5 are covered by the filter fabric 35, for example.
  • an annular filter fabric 35 In order to enable simple assembly of the filter fabric 35 on the circumference of the nozzle body 5 and to ensure that the filter fabric 35 is held on the nozzle body 5 until the filter 1 is finished, it is expedient to use an annular filter fabric 35.
  • Such a filter fabric 35 can be e.g. by welding the two ends of a band-shaped filter fabric.
  • FIG. 3 shows a second exemplary embodiment of a valve according to the invention
  • the filter fabric pieces thus only partially extend over the circumference of the nozzle body 5.
  • At least one recess 37 is formed on the circumference of the nozzle body 5, for example in the area covered by the filter fabric 35, which has the shape of a circumferential groove in the first exemplary embodiment shown.
  • the nozzle body 5 is provided in the region of the filter fabric 35 with a plastic overmold 39 which partially covers the filter fabric 35 and cools and shrinks after the spraying process, so that the filter fabric 35 is fixed in its position in relation to the through openings 7 of the nozzle body 5 and the plastic extrusion 39 sealingly encloses the nozzle body 5.
  • the most The circumference of the nozzle body 5 formed recess 37 is filled by the plastic extrusion 39 and thus a particularly firm and secure hold of the filter 1 consisting of filter fabric 35 and plastic extrusion 39 is achieved in the axial direction on the circumference of the nozzle body 5.
  • at least one flattening 38 is formed on the circumference of the nozzle body 5 in the region of the plastic encapsulation 39, which is caused by the plastic encapsulation 39 is closely surrounded.
  • the plastic encapsulation 39 of the filter 1 has an upper collar 40 at its end facing away from the valve seat 19 and a lower collar 42 at its end facing the valve seat 19.
  • flow openings 48 are formed in the plastic encapsulation 39, which cover the filter fabric 35 in the region of the through openings 7 of the nozzle body 5 and thus serve to supply the valve with fuel.
  • the throughflow openings 48 are delimited by axially extending webs 50, which connect the upper collar 40 and the lower collar 42 of the plastic encapsulation 39 of the filter 1 to each other, support the filter fabric 35 of the filter 1 and securely and reliably at the periphery in the region of the throughflow openings 48 hold the nozzle body 5.
  • the nozzle body 5 In the area of the laser weld seam 16 running in a circumferential reduction in cross section 52 of the nozzle body 5, the nozzle body 5 is surrounded by a retaining collar 54.
  • the circumferential retaining collar 54 becomes partial when a valve is formed in the axial direction surrounding plastic sheath 56 applied.
  • the plastic material of the retaining collar 54 fills the circumferential reduction in cross section 52 of the nozzle body 5 and thus protects the laser weld 16 in a simple manner against external damage.
  • a sealing ring 58 is arranged on the circumference of the nozzle body 5 in the axial direction between the lower collar 42 of the filter 1 and the retaining collar 54.
  • the sealing ring 58 serves to seal between the circumference of the valve and a valve receptacle, not shown, for example an intake line of the internal combustion engine.
  • FIG. 4 shows a third exemplary embodiment of a valve designed, for example, as a fuel injection valve with a filter 1 mounted according to the invention.
  • the filter 1 is arranged on the circumference of a valve housing 61 which limits the valve in the radial direction towards the outside.
  • the valve housing 61 has on its circumference, for example, six through openings 7 in the form of bores, all of which are at least approximately at the same axial height and which are used for supplying e.g. a fuel through the wall of the valve housing 61 into the interior of the valve or the outflow of excess fuel from the valve.
  • the filter fabric 35 for example in the form of a ring, is arranged on the circumference of the valve housing 61 in a first method step according to the invention such that the six through openings 7 are covered by the filter fabric 35.
  • the valve housing 61 is provided in the region of the filter fabric 35 with a plastic coating 39 which partially covers the filter fabric 35 and cools and shrinks after the injection process, so that the filter fabric 35 is held in its position in relation to the through openings 7 of the valve housing 61 and the plastic extrusion 39 sealingly encloses the valve housing 61.
  • the upper collar 40 and the lower collar 42 of the plastic encapsulation 39 of the filter 1 essentially serve to hold the filter 1 on the circumference of the valve housing 61.
  • Flow openings 48 are formed which cover the filter fabric 35 in the area of the passage openings 7 of the valve body 5.
  • the webs 50 formed in the axial direction between the upper collar 40 and the lower collar 42 limit the throughflow openings 48 in the circumferential direction of the filter 1, support the filter fabric 35 of the filter 1 and hold it on the circumference of the valve housing 61.
  • a sealing ring 63 is arranged on the circumference of the valve housing 61.
  • the axial mobility of the sealing ring 63 is limited by the upper end face 44 of the upper collar 40 of the filter 1 and a holding flange 65 of the plastic jacket 56 of the valve, which faces the electrical connector 11 of the valve.
  • the method according to the invention has the advantage that a filter 1 is formed in a simple manner by directly applying the plastic encapsulation 39 to the circumference of the valve body 5, 61 in the region of the filter fabric 35, soiling of the valve interior being avoided.

Abstract

In known valves, a filter element composed of plastic and having a filter fabric is pushed onto the circumference of a valve body provided with passage openings and there is the risk that the interior of the valve will be contaminated by plastic material of the filter element during the process of pushing on. <??>In the method according to the invention, for mounting a filter on a valve, the filter fabric (35) is arranged in such a way on the circumference of a valve body (5) that the filter fabric (35) covers the passage openings (7) of the valve body (5). The valve body (5) is then provided with a plastic encapsulation (39) in order to fix the filter fabric (35) in its position relative to the through openings (7). In this way, contamination of the interior of the valve by plastic particles is avoided. <??>The method according to the invention is suitable particularly for fuel injection valves for fuel injection systems of internal combustion engines. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zur Montage eines Filters an den Umfang eines ein Ventil in radialer Richtung nach außen begrenzenden Ventilkörpers bzw. von einem Ventil nach dem Oberbegriff des Anspruches 1 bzw. 6. Bei einem z.B. aus der DE 38 41 010 Al bekannten Ventil wird ein Filterelement auf das Ventilgehäuse aufgeschoben, so daß die wenigstens eine am Umfang des Ventilgehäuses ausgebildete durchgehende Öffnung durch das Filtergewebe im Bereich der Durchströmöffnungen des Filterelementes überdeckt ist. Das Filterelement wird hergestellt, indem ein Filtergewebe in einem Spritzwerkzeug mit Kunststoff umspritzt wird. Bei der Montage des Filterelementes auf den Ventilkörper besteht die Gefahr, daß sich an dem Filterelement Grate, die beim Entformen des Spritzwerkzeuges entstehen, lösen und das Ventil im Innern verschmutzen können. Zudem besteht allein durch den Fügevorgang die Möglichkeit des Materialabtrags auf der Innenseite des Filterelementes, da zur Fixierung der Lage eine Verpressung des Filters auf dem Ventilgehäuse erforderlich ist.The invention is based on a method for mounting a filter on the circumference of a valve body delimiting a valve in the radial direction outward, or on a valve according to the preamble of claims 1 and 6, for example. In one known from DE 38 41 010 Al Valve, a filter element is pushed onto the valve housing so that the at least one through opening formed on the circumference of the valve housing is covered by the filter fabric in the area of the throughflow openings of the filter element. The filter element is produced by extrusion-coating a filter fabric with plastic in an injection mold. When mounting the filter element on the valve body, there is a risk that burrs that arise when the injection mold is removed from the filter element can come loose and contaminate the valve inside. In addition, there is the possibility of material removal on the inside of the filter element solely by the joining process, since a compression of the filter on the valve housing is required to fix the position.

Außerdem sind an dem Ventilkörper Durchmesserabstufungen mit gerundeten Kanten erforderlich, um ein Aufschieben des Filterelementes auf den Ventilkörper, beispielsweise auf das Ventilgehäuse des Ventils, zu ermöglichen. Die Ausbildung dieser Durchmesserabstufungen erhöht die Herstellkosten eines derart hergestellten Ventils.In addition, diameter gradations with rounded edges are required on the valve body in order to enable the filter element to be pushed onto the valve body, for example onto the valve housing of the valve. The formation of these diameters increases the manufacturing costs of a valve manufactured in this way.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zur Montage eines Filters an den Umfang eines ein Ventil in radialer Richtung nach außen begrenzenden Ventilkörpers mit den kennzeichnenden Merkmalen des Anspruches 1 bzw. das Ventil mit den kennzeichnenden Merkmalen des Anspruches 6 haben demgegenüber den Vorteil, daß die Verschmutzung des Ventilinneren vermieden wird, da kein Aufschieben des Filters auf den Ventilkörper erfolgt, so daß sich auch keine Materialteilchen abschaben können. Die Dichtheit zwischen der als Gewebehalterung dienenden Kunststoffumspritzung und dem Ventilkörper wird durch das Aufschrumpfen der Kunststoffumspritzung auf den Ventilkörper unmittelbar nach dem Spritzvorgang aufgrund der Abkühlung des Kunststoffmaterials erzielt. Als weiterer Vorteil ergibt sich eine einfachere und kostengünstigere Herstellung des Ventils, da zu der Montage des Filters keine Durchmesserabstufungen mit abgerundeten Kanten an dem Umfang des Ventilkörpers erforderlich sind.The inventive method for mounting a filter on the circumference of a valve in the radial direction outwardly delimiting valve body with the characterizing features of claim 1 and the valve with the characterizing features of claim 6 have the advantage that the contamination of the valve interior is avoided , since the filter is not pushed onto the valve body, so that no material particles can scrape off. The tightness between the plastic encapsulation serving as a tissue holder and the valve body is achieved by shrinking the plastic encapsulation onto the valve body immediately after the spraying process due to the cooling of the plastic material. Another advantage is that the valve can be manufactured more simply and cost-effectively, since no diameter gradations with rounded edges on the circumference of the valve body are required for mounting the filter.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des Verfahrens nach Anspruch 1 bzw. des Ventils nach Anspruch 6 möglich.Advantageous further developments and improvements of the method according to claim 1 and of the valve according to claim 6 are possible through the measures listed in the subclaims.

Besonders vorteilhaft ist es, wenn der Ventilkörper an seinem Umfang zumindest eine Ausnehmung aufweist, die durch die Kunststoffumspritzung ausgefüllt wird. Hierdurch wird ein sicherer und zuverlässiger Halt des Filters an dem Umfang des Ventilkörpers gewährleistet.It is particularly advantageous if the valve body has at least one recess on its circumference, which is filled by the plastic encapsulation. This ensures a secure and reliable hold of the filter on the circumference of the valve body.

Vorteilhaft ist es ebenfalls, wenn der Ventilkörper an seinem Umfang zumindest eine Abflachung aufweist, die durch die Kunststoffumspritzung des Filters eng umgeben ist. Ein Verdrehen des Filters am Umfang des Ventilkörpers wird so wirkungsvoll verhindert.It is also advantageous if the valve body has at least one flattened portion on its periphery, which is closely surrounded by the plastic encapsulation of the filter. This effectively prevents the filter from rotating around the circumference of the valve body.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel eines Ventils mit einem erfindungsgemäß montierten Filter, Figur 2 einen Teilschnitt des in Figur 1 dargestellten ersten Ausführungsbeispiels und Figur 3 ein zweites sowie Figur 4 ein drittes Ausführungsbeispiel eines Ventils mit einem erfindungsgemäß montierten Filter.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a first exemplary embodiment of a valve with a filter mounted according to the invention, FIG. 2 shows a partial section of the first exemplary embodiment shown in FIG. 1, and FIG. 3 shows a second and FIG. 4 shows a third exemplary embodiment of a valve with a filter mounted according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die in den Figuren 1 bis 4 dargestellten Ventile in Form von elektromagnetisch betätigbaren Brennstoffeinspritzventilen für Brennstoffeinspritzanlagen von beispielsweise gemischverdichtenden fremdgezündeten Brennkraftmaschinen weisen einen erfindungsgemäß montierten Filter 1 auf, der zur Filterung eines dem Ventil zugeführten Fluids dient. Gleiche und gleichwirkende Teile sind in den vier Figuren durch die gleichen Bezugszeichen gekennzeichnet.The valves shown in FIGS. 1 to 4 in the form of electromagnetically actuated fuel injection valves for fuel injection systems of, for example, mixture-compression-ignition internal combustion engines have a filter 1 mounted according to the invention, which is used to filter a fluid supplied to the valve. The same and equivalent parts are identified in the four figures by the same reference numerals.

Bei dem in den Figuren 1 und 2 dargestellten ersten Ausführungsbeispiel ist der Filter 1 an dem Umfang eines das Ventil in radialer Richtung nach außen hin begrenzenden rohrförmigen Düsenkörpers 5 angeordnet. Der Düsenkörper 5 weist an seinem Umfang wenigstens eine, beispielsweise zwei Durchgangsöffnungen 7 in Form von teilweise umlaufenden Schlitzen auf, die sich alle zumindest in etwa auf der gleichen axialen Höhe des Düsenkörpers 5 befinden.In the first exemplary embodiment shown in FIGS. 1 and 2, the filter 1 is arranged on the circumference of a tubular nozzle body 5 which limits the valve in the radial direction towards the outside. The nozzle body 5 has at least one, for example two through openings 7 in the form of partially circumferential slots on its circumference, all of which are at least approximately at the same axial height of the nozzle body 5.

Diese Durchgangsöffnungen 7 dienen zur Zufuhr z.B. eines Brennstoffs in das Innere des rohrförmigen Düsenkörpers 5. Zur Betätigung des Ventils weist dieses an seinem einen Ende einen elektrischen Anschlußstecker 11 auf, der zur Kontaktierung einer nicht dargestellten Magnetspule dient. An seinem dem Anschlußstecker 11 abgewandten Ende ist in eine konzentrisch zu einer Ventillängsachse 9 verlaufende Längsöffnung 14 des Düsenkörpers 5 ein Sitzkörper 13 eingeschoben. Der Sitzkörper 13 ist an seinem Umfang mit der Wandung der Längsöffnung 14 an deren dem elektrischen Anschlußstecker 11 abgewandten Ende beispielsweise durch eine Laserschweißnaht 16 verbunden.These through openings 7 serve for supply e.g. of a fuel into the interior of the tubular nozzle body 5. To actuate the valve, this has at one end an electrical connector 11, which serves to contact a magnetic coil, not shown. At its end facing away from the connector 11, a seat body 13 is inserted into a longitudinal opening 14 of the nozzle body 5, which is concentric with a longitudinal valve axis 9. The seat body 13 is connected on its periphery to the wall of the longitudinal opening 14 at its end facing away from the electrical connector 11, for example by a laser weld 16.

Der Sitzkörper 13 weist in stromaufwärtiger Richtung den Durchgangsöffnungen 7 des Düsenkörpers 5 zugewandt eine konzentrisch zu der Ventillängsachse 9 verlaufende Führungsbohrung 15 auf, in der eine als Ventilschließkörper dienende Kugel 17 gleitbar gelagert ist. Stromabwärts der Führungsbohrung 15 ist im Sitzkörper 13 ein fester Ventilsitz 19 ausgebildet, der mit der Kugel 17 zusammenwirkt. Die Wandung der Führungsbohrung 15 ist durch in axialer Richtung verlaufende Brennstoffkanäle 21 unterbrochen, die eine Brennstoffströmung zu dem Ventilsitz 19 ermöglichen. Stromabwärts des Ventilsitzes 19 sind in dem Sitzkörper 13 beispielsweise zwei Abspritzöffnungen 23 ausgebildet, die den Brennstoff in eine konzentrisch zu der Ventillängsachse 9 verlaufende, sich in stromabwärtiger Richtung erweiternde Aufbereitungsbohrung 25 des Sitzkörpers 13 abspritzen.The seat body 13 has, in the upstream direction, the through openings 7 of the nozzle body 5, a guide bore 15 which runs concentrically to the longitudinal valve axis 9 and in which a ball 17 serving as a valve closing body is slidably mounted. Downstream of the guide bore 15, a fixed valve seat 19 is formed in the seat body 13, which cooperates with the ball 17. The wall of the guide bore 15 is interrupted by fuel channels 21 running in the axial direction, which enable fuel flow to the valve seat 19. Downstream of the valve seat 19, for example, two spray openings 23 are formed in the seat body 13, which spray the fuel into a treatment bore 25 of the seat body 13 which extends concentrically to the longitudinal valve axis 9 and widens in the downstream direction.

Die als Ventilschließkörper dienende Kugel 17 ist dem Ventilsitz 19 abgewandt unmittelbar mit einem rohrförmigen Anker 27 beispielsweise durch Laserschweißen verbunden. Der Anker 27 wirkt mit der Magnetspule und einem nicht dargestellten Kern des Ventils zusammen und dient zur Betätigung des Ventils. In einer Durchgangsbohrung 29 des Ankers 27 ist ein Halteabsatz 31 ausgebildet, an dem sich dem Ventilsitz 19 des Sitzkörpers 13 zugewandt eine Rückstellfeder 33 abstützt. Die Rückstellfeder 33 ist bestrebt, die als Ventilschließkörper dienende Kugel 17 in Richtung ihres Ventilsitzes 19 zu bewegen und so das Ventil zu schließen.The ball 17 serving as the valve closing body is connected to the valve seat 19, directly connected to a tubular armature 27, for example by laser welding. The armature 27 interacts with the magnet coil and a core (not shown) of the valve and serves to actuate the valve. In a through bore 29 of the armature 27, a retaining shoulder 31 is formed, on which a return spring 33 is supported, facing the valve seat 19 of the seat body 13. The return spring 33 strives to act as a valve closing body serving ball 17 to move in the direction of its valve seat 19 and thus close the valve.

Zur Montage des Filters 1 an den Umfang des Düsenkörpers 5 wird in einem ersten erfindungsgemäßen Verfahrensschritt ein Filtergewebe 35 so an dem Umfang des Düsenkörpers 5 angeordnet, daß die beispielsweise zwei Durchgangsöffnungen 7 des Düsenkörpers 5 durch das Filtergewebe 35 überdeckt sind. Um eine einfache Montage des Filtergewebes 35 auf den Umfang des Düsenkörpers 5 zu ermöglichen und einen Halt des Filtergewebes 35 an dem Düsenkörper 5 bis zur Fertigstellung des Filters 1 zu gewährleisten, ist es zweckmäßig, ein ringförmiges Filtergewebe 35 zu verwenden. Solch ein Filtergewebe 35 läßt sich in bekannter Weise z.B. durch das Verschweißen der beiden Enden eines bandförmigen Filtergewebes herstellen.To mount the filter 1 on the circumference of the nozzle body 5, a filter fabric 35 is arranged on the circumference of the nozzle body 5 in a first method step according to the invention such that the two through openings 7 of the nozzle body 5 are covered by the filter fabric 35, for example. In order to enable simple assembly of the filter fabric 35 on the circumference of the nozzle body 5 and to ensure that the filter fabric 35 is held on the nozzle body 5 until the filter 1 is finished, it is expedient to use an annular filter fabric 35. Such a filter fabric 35 can be e.g. by welding the two ends of a band-shaped filter fabric.

Es ist auch möglich, wie in der Figur 3, die ein zweites Ausführungsbeispiel eines erfindungsgemäßen Ventils zeigt, dargestellt, die Durchgangsöffnungen 7 des Düsenkörpers 5 durch einzelne Filtergewebestücke zu überdecken, die etwas größer als der Querschnitt der jeweiligen Durchgangsöffnung 7 sind und eine runde, rechteckige, ovale oder andere Form haben können. Die Filtergewebestücke erstrecken sich also nur teilweise über den Umfang des Düsenkörpers 5.It is also possible, as shown in FIG. 3, which shows a second exemplary embodiment of a valve according to the invention, to cover the through openings 7 of the nozzle body 5 with individual filter fabric pieces which are somewhat larger than the cross section of the respective through opening 7 and a round, rectangular one , oval or other shape. The filter fabric pieces thus only partially extend over the circumference of the nozzle body 5.

An dem Umfang des Düsenkörpers 5 ist beispielsweise in dem von dem Filtergewebe 35 überdeckten Bereich zumindest eine Ausnehmung 37 ausgebildet, die in dem dargestellten ersten Ausführungsbeispiel die Form einer umlaufenden Nut hat. In einem zweiten Verfahrensschritt wird der Düsenkörper 5 im Bereich des Filtergewebes 35 mit einer das Filtergewebe 35 teilweise überdeckenden Kunststoffumspritzung 39 versehen, die sich nach dem Abspritzvorgang abkühlt und zusammenschrumpft, so daß das Filtergewebe 35 in seiner Lage gegenüber den Durchgangsöffnungen 7 des Düsenkörpers 5 fixiert ist und die Kunststoffumspritzung 39 den Düsenkörper 5 dichtend umschließt. Die am Umfang des Düsenkörpers 5 ausgebildete Ausnehmung 37 wird durch die Kunststoffumspritzung 39 ausgefüllt und so ein besonders fester und sicherer Halt des aus Filtergewebe 35 und Kunststoffumspritzung 39 bestehenden Filters 1 in axialer Richtung an dem Umfang des Düsenkörpers 5 erzielt. Um ein Verdrehen des Filters 1 an dem Umfang des Düsenkörpers 5 zu verhindern, ist es auch möglich, wie in Figur 3 dargestellt, daß an dem Umfang des Düsenkörpers 5 im Bereich der Kunststoffumspritzung 39 zumindest eine Abflachung 38 ausgebildet ist, die durch die Kunststoffumspritzung 39 eng umgeben ist.At least one recess 37 is formed on the circumference of the nozzle body 5, for example in the area covered by the filter fabric 35, which has the shape of a circumferential groove in the first exemplary embodiment shown. In a second method step, the nozzle body 5 is provided in the region of the filter fabric 35 with a plastic overmold 39 which partially covers the filter fabric 35 and cools and shrinks after the spraying process, so that the filter fabric 35 is fixed in its position in relation to the through openings 7 of the nozzle body 5 and the plastic extrusion 39 sealingly encloses the nozzle body 5. The most The circumference of the nozzle body 5 formed recess 37 is filled by the plastic extrusion 39 and thus a particularly firm and secure hold of the filter 1 consisting of filter fabric 35 and plastic extrusion 39 is achieved in the axial direction on the circumference of the nozzle body 5. In order to prevent the filter 1 from rotating on the circumference of the nozzle body 5, it is also possible, as shown in FIG. 3, for at least one flattening 38 to be formed on the circumference of the nozzle body 5 in the region of the plastic encapsulation 39, which is caused by the plastic encapsulation 39 is closely surrounded.

Die Kunststoffumspritzung 39 des Filters 1 weist an ihrem dem Ventilsitz 19 abgewandten Ende einen oberen Bund 40 und an ihrem dem Ventilsitz 19 zugewandten Ende einen unteren Bund 42 auf. Der Filter 1 liegt mit seiner einen, durch den oberen Bund 40 der Kunststoffumspritzung 39 gebildeten oberen Stirnseite 44 an einer den Filter 1 zugewandten, radial nach außen weisenden Haltefläche 46 des Düsenkörpers 5 an.The plastic encapsulation 39 of the filter 1 has an upper collar 40 at its end facing away from the valve seat 19 and a lower collar 42 at its end facing the valve seat 19. The filter 1, with its one upper end face 44 formed by the upper collar 40 of the plastic extrusion 39, bears against a holding surface 46 of the nozzle body 5 facing the filter 1 and pointing radially outwards.

Zwischen dem oberen Bund 40 und dem unteren Bund 42 der Kunststoffumspritzung 39 sind in der Kunststoffumspritzung 39 Durchströmöffnungen 48 ausgebildet, die das Filtergewebe 35 im Bereich der Durchgangsöffnungen 7 des Düsenkörpers 5 überdecken und so der Brennstoffversorgung des Ventils dienen. Die Durchströmöffnungen 48 sind durch axial verlaufende Stege 50 begrenzt, die den oberen Bund 40 und den unteren Bund 42 der Kunststoffumspritzung 39 des Filters 1 miteinander verbinden, das Filtergewebe 35 des Filters 1 stützen und es im Bereich der Durchströmöffnungen 48 sicher und zuverlässig an dem Umfang des Düsenkörpers 5 halten.Between the upper collar 40 and the lower collar 42 of the plastic encapsulation 39, flow openings 48 are formed in the plastic encapsulation 39, which cover the filter fabric 35 in the region of the through openings 7 of the nozzle body 5 and thus serve to supply the valve with fuel. The throughflow openings 48 are delimited by axially extending webs 50, which connect the upper collar 40 and the lower collar 42 of the plastic encapsulation 39 of the filter 1 to each other, support the filter fabric 35 of the filter 1 and securely and reliably at the periphery in the region of the throughflow openings 48 hold the nozzle body 5.

In dem Bereich der in einer umlaufenden Querschnittsverringerung 52 des Düsenkörpers 5 verlaufenden Laserschweißnaht 16 ist der Düsenkörper 5 von einem Haltebund 54 umgeben. Der umlaufende Haltebund 54 wird bei der Ausbildung einer das Ventil in axialer Richtung teilweise umgebenden Kunststoffummantelung 56 mitaufgebracht. Das Kunststoffmaterial des Haltebundes 54 füllt die umlaufende Querschnittsverringerung 52 des Düsenkörpers 5 aus und schützt so die Laserschweißnaht 16 auf einfache Art und Weise vor äußeren Beschädigungen.In the area of the laser weld seam 16 running in a circumferential reduction in cross section 52 of the nozzle body 5, the nozzle body 5 is surrounded by a retaining collar 54. The circumferential retaining collar 54 becomes partial when a valve is formed in the axial direction surrounding plastic sheath 56 applied. The plastic material of the retaining collar 54 fills the circumferential reduction in cross section 52 of the nozzle body 5 and thus protects the laser weld 16 in a simple manner against external damage.

An dem Umfang des Düsenkörpers 5 ist in axialer Richtung zwischen dem unteren Bund 42 des Filters 1 und dem Haltebund 54 ein Dichtring 58 angeordnet. Der Dichtring 58 dient zur Abdichtung zwischen dem Umfang des Ventils und einer nicht dargestellten Ventilaufnahme beispielsweise einer Ansaugleitung der Brennkraftmaschine.A sealing ring 58 is arranged on the circumference of the nozzle body 5 in the axial direction between the lower collar 42 of the filter 1 and the retaining collar 54. The sealing ring 58 serves to seal between the circumference of the valve and a valve receptacle, not shown, for example an intake line of the internal combustion engine.

Die Figur 4 zeigt ein drittes Ausführungsbeispiel eines beispielsweise als Brennstoffeinspritzventil ausgestalteten Ventils mit einem erfindungsgemäß montierten Filter 1. Bei diesem Ausführungsbeispiel ist der Filter 1 an dem Umfang eines das Ventil in radialer Richtung nach außen hin begrenzenden Ventilgehäuses 61 angeordnet. Das Ventilgehäuse 61 weist an seinem Umfang beispielsweise sechs Durchgangsöffnungen 7 in Form von Bohrungen auf, die sich alle zumindest in etwa auf der gleichen axialen Höhe befinden und die der Zufuhr z.B. eines Brennstoffes durch die Wand des Ventilgehäuses 61 hindurch in das Innere des Ventils oder dem Abströmen von überschüssigem Brennstoff aus dem Ventil dienen.FIG. 4 shows a third exemplary embodiment of a valve designed, for example, as a fuel injection valve with a filter 1 mounted according to the invention. In this exemplary embodiment, the filter 1 is arranged on the circumference of a valve housing 61 which limits the valve in the radial direction towards the outside. The valve housing 61 has on its circumference, for example, six through openings 7 in the form of bores, all of which are at least approximately at the same axial height and which are used for supplying e.g. a fuel through the wall of the valve housing 61 into the interior of the valve or the outflow of excess fuel from the valve.

Zur Montage des Filters 1 an den Umfang des Ventilgehäuses 61 wird in einem ersten erfindungsgemäßen Verfahrensschritt das beispielsweise in Form eines Ringes vorliegende Filtergewebe 35 so an den Umfang des Ventilgehäuses 61 angeordnet, daß die sechs Durchgangsöffnungen 7 durch das Filtergewebe 35 überdeckt sind. In einem zweiten Verfahrensschritt wird das Ventilgehäuse 61 im Bereich des Filtergewebes 35 mit einer das Filtergewebe 35 teilweise überdeckenden Kunststoffumspritzung 39 versehen, die sich nach dem Spritzvorgang abkühlt und zusammenschrumpft, so daß das Filtergewebe 35 in seiner Lage gegenüber den Durchgangsöffnungen 7 des Ventilgehäuses 61 gehalten ist und die Kunststoffumspritzung 39 das Ventilgehäuse 61 dichtend umschließt.To mount the filter 1 on the circumference of the valve housing 61, the filter fabric 35, for example in the form of a ring, is arranged on the circumference of the valve housing 61 in a first method step according to the invention such that the six through openings 7 are covered by the filter fabric 35. In a second process step, the valve housing 61 is provided in the region of the filter fabric 35 with a plastic coating 39 which partially covers the filter fabric 35 and cools and shrinks after the injection process, so that the filter fabric 35 is held in its position in relation to the through openings 7 of the valve housing 61 and the plastic extrusion 39 sealingly encloses the valve housing 61.

Der obere Bund 40 und der untere Bund 42 der Kunststoffumspritzung 39 des Filters 1 dienen dabei im wesentlichen zum Halten des Filters 1 an dem Umfang des Ventilgehäuses 61. Zur Brennstoffversorgung des Ventils sind zwischen dem oberen Bund 40 und dem unteren Bund 42 in der Kunststoffumspritzung 39 Durchströmöffnungen 48 ausgebildet, die das Filtergewebe 35 im Bereich der Durchgangsöffnungen 7 des Ventilkörpers 5 überdecken. Die in axialer Richtung zwischen dem oberen Bund 40 und dem unteren Bund 42 ausgebildeten Stege 50 begrenzen die Durchströmöffnungen 48 in Umfangsrichtung des Filters 1, stützen das Filtergewebe 35 des Filters 1 ab und halten es am Umfang des Ventilgehäuses 61.The upper collar 40 and the lower collar 42 of the plastic encapsulation 39 of the filter 1 essentially serve to hold the filter 1 on the circumference of the valve housing 61. To supply the valve with fuel, there are between the upper collar 40 and the lower collar 42 in the plastic encapsulation 39 Flow openings 48 are formed which cover the filter fabric 35 in the area of the passage openings 7 of the valve body 5. The webs 50 formed in the axial direction between the upper collar 40 and the lower collar 42 limit the throughflow openings 48 in the circumferential direction of the filter 1, support the filter fabric 35 of the filter 1 and hold it on the circumference of the valve housing 61.

An dem Umfang des Ventilgehäuses 61 ist ein Dichtring 63 angeordnet. Die axiale Bewegbarkeit des Dichtringes 63 wird durch die obere Stirnseite 44 des oberen Bundes 40 des Filters 1 und einen Halteflansch 65 der Kunststoffummantelung 56 des Ventils begrenzt, der dem elektrischen Anschlußstecker 11 des Ventils zugewandt ist.A sealing ring 63 is arranged on the circumference of the valve housing 61. The axial mobility of the sealing ring 63 is limited by the upper end face 44 of the upper collar 40 of the filter 1 and a holding flange 65 of the plastic jacket 56 of the valve, which faces the electrical connector 11 of the valve.

Das erfindungsgemäße Verfahren bietet den Vorteil, daß durch das direkte Aufbringen der Kunststoffumspritzung 39 auf den Umfang des Ventilkörpers 5, 61 im Bereich des Filtergewebes 35 auf einfache Art und Weise ein Filter 1 gebildet wird, wobei ein Verschmutzen des Ventilinnern vermieden wird.The method according to the invention has the advantage that a filter 1 is formed in a simple manner by directly applying the plastic encapsulation 39 to the circumference of the valve body 5, 61 in the region of the filter fabric 35, soiling of the valve interior being avoided.

Claims (10)

Verfahren zur Montage eines Filters an den Umfang eines ein Ventil, insbesondere ein Brennstoffeinspritzventil in radialer Richtung nach außen hin begrenzenden Ventilkörpers, der an seinem Umfang wenigstens eine Durchgangsöffnung aufweist, dadurch gekennzeichnet, daß in einem ersten Verfahrensschritt ein Filtergewebe (35) so an dem Umfang des Ventilkörpers (5, 61) angeordnet wird, daß die wenigstens eine Durchgangsöffnung (7) durch das Filtergewebe (35) überdeckt ist und in einem zweiten Verfahrensschritt der Ventilkörper (5, 61) zumindest im Bereich des Filtergewebes (35) mit einer teilweisen Kunststoffumspritzung versehen wird, um so das Filtergewebe (35) in seiner Lage gegenüber dem Ventilkörper (5, 61) zu fixieren.Method for mounting a filter on the circumference of a valve body, in particular a fuel injection valve, delimiting in the radial direction towards the outside and having at least one through opening on its circumference, characterized in that in a first method step a filter fabric (35) is arranged on the circumference the valve body (5, 61) is arranged in such a way that the at least one through opening (7) is covered by the filter fabric (35) and in a second process step the valve body (5, 61) at least in the area of the filter fabric (35) with a partial plastic coating is provided so as to fix the filter fabric (35) in its position relative to the valve body (5, 61). Verfahren nach Anspruch 1, wobei der Ventilkörper an seinem Umfang zumindest eine Ausnehmung aufweist, dadurch gekennzeichnet, daß die Ausnehmung (37) durch die Kunststoffumspritzung (39) ausgefüllt wird.Method according to claim 1, wherein the valve body has at least one recess on its circumference, characterized in that the recess (37) is filled by the plastic extrusion coating (39). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Ventilkörper an seinem Umfang zumindest eine Abflachung (38) aufweist, die durch die Kunststoffumspritzung (39) des Filters (1) eng umgeben wird.Method according to Claim 1 or 2, characterized in that the valve body has at least one flattened portion (38) on its circumference, which is closely surrounded by the plastic encapsulation (39) of the filter (1). Verfahren nach einem der Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß es sich bei dem Ventilkörper (5, 61) um einen Düsenkörper (5) des Ventils handelt.Method according to one of claims 1 to 3, characterized in that the valve body (5, 61) is a nozzle body (5) of the valve. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es sich bei dem Ventilkörper (5, 61) um ein Ventilgehäuse (61) des Ventils handelt.Method according to one of claims 1 to 3, characterized in that the valve body (5, 61) is a valve housing (61) of the valve. Ventil, insbesondere Brennstoffeinspritzventil, das in radialer Richtung nach außen hin von einem Ventilkörper begrenzt ist, der an seinem Umfang wenigstens eine Durchgangsöffnung sowie einen Filter mit einer Kunststoffumspritzung aufweist, dessen Filtergewebe die wenigstens eine Durchgangsöffnung überdeckt, insbesondere nach einem Verfahren nach den Ansprüchen 1 bis 5 hergestelltes Ventil, dadurch gekennzeichnet, daß das Filtergewebe durch die zusammen mit dem Filtergewebe (35) den Filter (1) bildende und direkt auf den Ventilkörper (5, 61) aufgespritzte Kunststoffumspritzung (39) an dem Umfang des Ventilkörpers (5, 61) gehalten ist.Valve, in particular fuel injection valve, which is bounded in the radial direction towards the outside by a valve body which has at least one through opening on its circumference and a filter with a plastic extrusion coating, the filter fabric of which covers the at least one through opening, in particular according to a method according to claims 1 to 5 manufactured valve, characterized in that the filter fabric on the circumference of the valve body (5, 61) through the plastic coating (39) forming the filter (1) and sprayed directly onto the valve body (5, 61) together with the filter fabric (35) is held. Ventil nach Anspruch 6, mit einer an dem Umfang des Ventilkörpers ausgebildeten Ausnehmung, dadurch gekennzeichnet, daß die Ausnehmung (37) durch die Kunststoffumspritzung (39) ausgefüllt ist.Valve according to claim 6, with a recess formed on the circumference of the valve body, characterized in that the recess (37) is filled by the plastic extrusion coating (39). Ventil nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Ventilkörper (5, 61) an seinem Umfang zumindest eine Abflachung (38) aufweist, die durch die Kunststoffumspritzung (39) des Filters (1) eng umgeben ist.Valve according to Claim 6 or 7, characterized in that the valve body (5, 61) has at least one flattened portion (38) on its circumference, which is closely surrounded by the plastic encapsulation (39) of the filter (1). Ventil nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß es sich bei dem Ventilkörper (5, 61) um einen Düsenkörper (5) des Ventils handelt.Valve according to one of claims 6 to 8, characterized in that the valve body (5, 61) is a nozzle body (5) of the valve. Ventil nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß es sich bei dem Ventilkörper (5, 61) um ein Ventilgehäuse (61) des Ventils handelt.Valve according to one of claims 6 to 8, characterized in that the valve body (5, 61) is a valve housing (61) of the valve.
EP19910118482 1990-11-29 1991-10-30 Method for mounting a filter on a valve Expired - Lifetime EP0487916B1 (en)

Applications Claiming Priority (2)

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DE19904037952 DE4037952A1 (en) 1990-11-29 1990-11-29 METHOD FOR MOUNTING A FILTER ON A VALVE AND VALVE
DE4037952 1990-11-29

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EP0487916A1 true EP0487916A1 (en) 1992-06-03
EP0487916B1 EP0487916B1 (en) 1995-01-04

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Also Published As

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US5186882A (en) 1993-02-16
US5330649A (en) 1994-07-19
JPH04272469A (en) 1992-09-29
DE4037952A1 (en) 1992-06-04
EP0487916B1 (en) 1995-01-04
DE59104149D1 (en) 1995-02-16

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