EP0612375B1 - Valve needle for an electromagnetically controlled valve and process for producing the same - Google Patents

Valve needle for an electromagnetically controlled valve and process for producing the same Download PDF

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Publication number
EP0612375B1
EP0612375B1 EP19930918902 EP93918902A EP0612375B1 EP 0612375 B1 EP0612375 B1 EP 0612375B1 EP 19930918902 EP19930918902 EP 19930918902 EP 93918902 A EP93918902 A EP 93918902A EP 0612375 B1 EP0612375 B1 EP 0612375B1
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EP
European Patent Office
Prior art keywords
valve
section
armature
closing element
needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP19930918902
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German (de)
French (fr)
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EP0612375A1 (en
Inventor
Peter Romann
Ferdinand Reiter
Martin Maier
Thomas Naeger
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Priority to DE19924230376 priority Critical patent/DE4230376C1/de
Priority to DE4230376 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE1993/000759 priority patent/WO1994007024A1/en
Publication of EP0612375A1 publication Critical patent/EP0612375A1/en
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Publication of EP0612375B1 publication Critical patent/EP0612375B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors 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
    • F02M51/0671Injectors 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
    • F02M51/0682Injectors 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 the body being hollow and its interior communicating with the fuel flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal

Abstract

In known electromagnetically controllable valves the valve needle consists of a tubular armature section, a tubular valve sleeve section and a valve closing member section. The armature section is linked to the first end of the valve sleeve section by means of a first solder and the valve closing member section is linked to the other end of the valve sleeve section by means of a second solder. This production process is relatively expensive and costly because of the two soldering operations required. In a new valve needle (58), a tubular actuating part (31) consisting of an armature section (36) and of a valve sleeve section (38) is produced by injection moulding followed by sintering, according to the metal injection moulding process. The actuating part (32) is then linked to a valve closing member section (46) by means of a solder, so that the valve needle (58) can thus be produced in a simple and economical manner. This valve needle is particularly suitable for injection valves in fuel injection systems of internal combustion engines.

Description

    Stand der Technik State of the art
  • Die Erfindung geht aus von einer Ventilnadel für ein elektromagnetisch betätigbares Ventil bzw. von einem Verfahren zur Herstellung einer Ventilnadel nach der Gattung des Anspruches 1 bzw. des Anspruches 4. Aus Patent Abstracts of Japan, Band 14, Nr. 49(M-927), 29. Januar 1990 und JP-A-1-277677 ist eine Ventilnadel für ein elektromagnetisch betätigbares Ventil bekannt, die aus einem Ankerabschnitt, einem Ventilschließgliedabschnitt und einem den Ankerabschnitt mit dem Ventilschließgliedabschnitt verbindenden Ventilhülsenabschnitt besteht. The invention relates to a valve needle for an electromagnetically actuable valve or by a method for producing a valve needle according to the preamble of claim 1 and of claim 4. From Patent Abstracts of Japan, Vol. 14, No. 49 (M-927) , January 29, 1990 and JP-a-1-277677 is a valve needle for an electromagnetically actuable valve is known that consists of an armature section, a valve-closing element section and an armature section to the valve closing member section connecting the valve sleeve section. Der Ankerabschnitt ist mit dem Ventilhülsenabschnitt mittels eines Metal-Injection-Molding-verfahrens als ein Teil hergestellt, während der Ventilschließgliedabschnitt mit dem Ventilhülsenabschnitt mittels einer Klemmverbindung oder einer Schweißverbindung verbunden ist. The anchor portion is formed with the valve sleeve portion by means of a metal injection molding process as a part, while the valve-closing member portion is connected to the valve sleeve portion by means of a clamping connection or a welded connection. Zur Herstellung der Ventilnadel sind also zwei Arbeitsgänge erforderlich, die zu einer relativ aufwendigen und teuren Fertigung der Ventilnadel führen. To prepare the valve needle two operations are thus required, leading to a relatively complex and expensive manufacturing of the valve needle. Zudem besteht die Gefahr, daß beim Herstellen der Schweißverbindung zwischen dem ventilschließgliedabschnitt und dem Ventilhülsenabschnitt Schweißspritzer entstehen, die sich an der inneren Wandung des Ventilhülsenabschnittes ablagern und die Funktion des Ventils beeinträchtigen. In addition, there is a risk that during production of the weld joint between the valve-closing element section and the valve sleeve section spatter, which are deposited on the inner wall of the valve sleeve section and impair the function of the valve.
  • Bekannt ist aus der US-A-4 197 996, die den nächstkommenden Stand der Technik bildet, eine Ventilnadel, die durch spanabtragende Verfahren als ein Teil mit einem Ankerabschnitt, einem Ventilhülsenabschnitt und einem Ventilschließgliedabschnitt hergestellt ist. is known from US-A-4,197,996 which forms the closest prior art, a valve needle which is produced by chip-removing method as one piece with an armature section, a valve sleeve section and a valve closing member section.
  • Vorteile der Erfindung Advantages of the Invention
  • Die erfindungsgemäße Ventilnadel mit den Merkmalen des Anspruches 1 bzw. das erfindungsgemäße Verfahren mit den Merkmalen des Anspruches 4 haben demgegenüber den Vorteil, daß eine solche Ventilnadel auf einfache und kostengünstige Art und Weise herstellbar ist. In contrast, the valve needle according to the invention with the features of claim 1 and the inventive method having the features of claim 4 have the advantage that such a valve needle in a simple and cost-effective manner can be produced. Die Zusammensetzung des verwendeten Metallpulvers kann dabei einfach auf optimale magnetische Eigenschaften des Ankerabschnittes abgestimmt werden. The composition of the metal powder used can thereby be easily tuned to optimum magnetic properties of the anchor portion.
  • Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Ventilnadel und des im Anspruch 4 angegebenen Verfahrens möglich. By the provisions recited in the dependent claims permit advantageous developments and improvements of the features indicated in claim 1 and of the valve needle specified in claim 4 process are possible.
  • Für eine gute Entformung aus den bei der Herstellung verwendeten Formwerkzeugen ist es vorteilhaft, wenn sich der Ventilhülsenabschnitt ausgehend von dem Ankerabschnitt in Richtung des Ventilschließgliedabschnittes verjüngt. For a good release from the used in the manufacture of molds, it is advantageous when the valve sleeve section tapers starting from the anchor portion in the direction of the valve closing member section.
  • Zur Reduzierung des Gewichtes der Ventilnadel ist es vorteilhaft, wenn in der Wandung der Längsöffnung des Ventilhülsenabschnittes Ausnehmungen ausgebildet sind, die sich in Richtung zu der Ventillängsachse erstrecken, so daß die Strömung durch die Längsöffnung des Ventilhülsenabschnittes nicht behindert wird. In order to reduce the weight of the valve needle, it is advantageous if the valve sleeve section recesses are formed in the wall of the longitudinal opening extending in the direction of the valve longitudinal axis, so that the flow is not hindered by the longitudinal opening of the valve sleeve section.
  • Von Vorteil ist es, wenn als Bindemittel ein Kunststoffbindemittel verwendet wird und, wenn dieses Bindemittel durch eine thermische Behandlung des Formteils aus diesem Formteil entfernt wird. It is advantageous if a plastic binder is used as a binder and, if this binder is removed by a thermal treatment of the molding of this molding. Auf diese Weise wird eine besonders einfache Herstellung eines die Ventilnadel bildenden Formteiles ermöglicht, das bereits eine hohe Gefügedichte aufweist. In this way, a particularly simple manufacture is made possible of the valve needle forming the molded article, which already has a high structural density.
  • Besonders vorteilhaft ist es, wenn das Formteil nach dem Sintern heißisostatisch gepreßt wird, so daß sich ein besonders dichtes Gefüge der Ventilnadel ergibt. It is particularly advantageous if the molded part is hot isostatically pressed following the sintering, so that a particularly dense structure results in the valve needle.
  • Zeichnung drawing
  • Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Embodiments of the invention are shown simplified in the drawing and explained in more detail in the following description. Es zeigen Figur 1 ein Brennstoffeinspritzventil mit einer bekannten Ventilnadel Figur 2 eine in ihre zweiteiligen Form bekannte Ventilnadel, Figur 3 eine Ventilnadel gemäß der vorliegenden Erfindung, Figur 4 ein erfindungsgemäßes Herstellungsverfahren einer Ventilnadel. 1 shows a fuel injector with a known valve needle in Figure 2 a known form of their two-part valve needle 3, a needle valve according to the present invention, Figure 4 is an inventive method of manufacturing a valve needle.
  • Beschreibung der Ausführungsbeispiele Description of Embodiments
  • Das in der Figur 1 beispielsweise dargestellte elektromagnetisch betätigbare Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Brennstoffeinlaßstutzen dienenden Kern 2. Die Magnetspule 1 mit einem Spulenkörper 3 ist zB mit einer Kunststoffumspritzung 5 versehen, wobei zugleich ein elektrischer Anschlußstecker 6 mitangespritzt ist. The in the Figure 1 example shown electromagnetically operable valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engine has a space surrounded by a magnet coil 1, as a fuel inlet fitting serving core 2. The magnet coil 1 with a bobbin 3 is provided for example by a plastic sheathing 5, wherein at the same time, an electrical connector is mitangespritzt. 6
  • Mit einem unteren Kernende 10 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 11 dicht ein rohrförmiges, metallenes Zwischenteil 12 beispielsweise durch Schweißen verbunden und übergreift dabei mit einem oberen Zylinderabschnitt 14 das Kernende 10 teilweise axial. With a lower core end 10 of the core 2 is concentric to a valve longitudinal axis 11 close a tubular metal intermediate part 12, for example by welding and thereby engages with an upper cylinder portion 14, the core end 10 partially axially. Der Spulenkörper 3 übergreift teilweise den Kern 2 und den oberen Zylinderabschnitt 14 des Zwischenteils 12. Das Zwischenteil 12 ist an seinem dem Kern 2 abgewandten Ende mit einem unteren Zylinderabschnitt 18 versehen, der einen rohrförmigen Düsenträger 19 übergreift und mit diesem beispielsweise durch Schweißen dicht verbunden ist. The bobbin 3 partially overlaps the core 2 and the upper cylinder portion 14 of the intermediate part 12. The intermediate part 12 is provided 2 facing away from the end with a lower cylinder portion 18 at its core which engages over a tubular nozzle holder 19 and, for example, tightly connected with this by welding , In das stromabwärts liegende Ende des Düsenträgers 19 ist in einer konzentrisch zu der Ventillängsachse 11 verlaufenden Durchgangsbohrung 20 ein zylinderförmiger Ventilsitzkörper 21 durch Schweißen dicht montiert. In the downstream end of the nozzle holder 19 in an extending concentrically to the valve longitudinal axis 11 of through bore 20, a cylindrical valve seat body 21 is tightly mounted by welding. Der Ventilsitzkörper 21 weist der Magnetspule 1 zugewandt einen festen Ventilsitz 22 auf, stromabwärts dessen im Ventilsitzkörper 21 zB zwei Abspritzöffnungen 23 ausgebildet sind. The valve seat body 21 comprises the solenoid coil 1 faces a fixed valve seat 22, downstream of which are formed in the valve seat body 21, for example two injection openings 23rd Stromabwärts der Abspritzöffnungen 23 hat der Ventilsitzkörper 21 eine sich in Strömungsrichtung kegelstumpfförmig erweiternde Aufbereitungsbohrung 24. Downstream of the spray-discharge openings 23 has the valve seat body 21 has a frusto-conically widening in the direction of flow treatment bore 24th
  • In eine konzentrisch zu der Ventillängsachse 11 verlaufende abgestufte Strömungsbohrung 25 des Kerns 2 ist zur Einstellung der Federkraft einer Rückstellfeder 26 eine rohrförmige Einstellbuchse 27 eingepreßt. In a running concentrically to the valve longitudinal axis 11 of graded flow bore 25 of the core 2 for adjusting the spring force of a return spring 26 is press-fitted a tubular adjusting bush 27th Die Rückstellfeder 26 liegt mit ihrem einen Ende an einer dem Ventilsitzkörper 21 zugewandten unteren Stirnseite 28 der Einstellbuchse 27 an. The return spring 26 is located with its one end on a valve-seat member 21 facing the lower end face 28 of the adjusting sleeve 27 at. Die Einpreßtiefe der Einstellbuchse 27 in die Strömungsbohrung 25 des Kerns 2 bestimmt die Federkraft der Rückstellfeder 26 und beeinflußt damit auch die dynamische, während des Öffnungs- und des Schließhubes des Ventils abgegebene Brennstoffmenge. The pressing depth of the adjusting sleeve 27 in the flow bore 25 of the core 2 determines the spring force of the return spring 26 and thus also influences the dynamic, during the opening and the closing stroke of the valve given amount of fuel. Mit ihrem der Einstellbuchse 27 abgewandten Ende stützt sich die Rückstellfeder 26 an einem Halteabsatz 30 eines rohrförmigen, zB konzentrisch zu der Ventillängsachse 11 angeordneten Betätigungsteiles 32 ab. With its end facing away from the adjusting bush 27, the restoring spring 26 of a tubular, for example, arranged concentrically to the valve longitudinal axis 11 of actuating member 32 is supported on a retaining shoulder 30th Das Betätigungsteil 32 weist eine Längsöffnung 34 auf, die dem Kern 2 zugewandt in den Halteabsatz 30 übergeht. The operating member 32 has a longitudinal opening 34 which faces the core 2 merges into the retaining shoulder 30th
  • Eine Ventilnadel 58, die von der in der Figur 1 dargetellten teilweise abweicht, ist in Figur 2 gezeigt. A valve needle 58 that partially deviates from the dargetellten in the figure 1 is shown in FIG. 2
  • Das rohrförmige Betätigungsteil 32 besteht aus einem rohrförmig ausgebildeten, dem Kern 2 zugewandten und mit dem Kern 2 sowie der Magnetspule 1 zusammenwirkenden Ankerabschnitt 36 und einem sich dem Ventilsitzkörper 21 zugewandt erstreckenden rohrförmigen Ventilhülsenabschnitt 38. Nahe ihres dem Ankerabschnitt 35 abgewandten Endes 39 ist in der Längsöffnung 34 des Betätigungsteils 32 ein Boden 40 ausgebildet. The tubular actuating member 32 consists of a tubular design, the core 2 facing and cooperating with the core 2 and the coil 1 anchor portion 36 and a to the valve seat body 21 faces extending tubular valve sleeve portion 38. Near its anchor portion 35 end 39 facing away in the longitudinal opening 34 of the operating part 32, a bottom 40 is formed. Der Boden 40 unterteilt die Längsöffnung 34 des Betätigungsteils 32 in einen dem Kern 2 zugewandten, eine Verlängerung der Strömungsbohrung 25 des Kerns 2 bildenden sacklochförmigen Strömungsabschnitt 42 sowie einen im Vergleich zu dem Strömungsabschnitt 42 nur eine geringe axiale Erstreckung aufweisenden Sacklochabschnitt 44. An dem Ende 39 des Ventilhülsenabschnittes 38 ist das Betätigungsteil 32 mit einem zB kugelförmigen Ventilschließgliedabschnitt 46 mittels einer Schweißverbindung 48 verbunden. The bottom 40 divides the longitudinal opening 34 of the actuating member facing in a core 2 32, an extension of the flow bore 25 of the core 2 forming a blind hole-shaped flow section 42 and one in comparison to the flow section 42, only a small axial extension having a blind hole portion 44. At the end 39 of the valve sleeve portion 38, the actuating part 32 connected to a valve closing member, for example, spherical portion 46 by a welded joint 48th Um eine möglichst gute Verbindung und eine exakte Zentrierung des kugelförmigen Ventilschließgliedabschnittes 46 gegenüber dem Betätigungsteil 32 zu erzielen, hat der Ventilhülsenabschnitt 38 des Betätigungsteiles 32 an seinem Ende 39 dem Halteabsatz 30 abgewandt eine stirnseitige, zB kalottenförmig ausgebildete Anlagefläche 49. Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 haben in der Regel einen geringeren Durchmesser als der Ankerabschnitt 36. Der beispielsweise kugelförmige Ventilschließgliedabschnitt 46 weist an seinem Umfang zB vier Abflachungen 50 auf, die das Strömen des Brennstoffs in Richtung des Ventilsitzes 22 des Ventilsitzkörpers 21 erleichtern. In order to achieve the best possible connection and a precise centering of the spherical valve-closing member portion 46 opposite the operating portion 32 of the valve sleeve portion 38 has the actuating part have turned 32 at its end 39 of the retaining shoulder 30 is an end, for example dome-formed bearing surface 49. Valve sleeve portion 38 and valve-closing element section 46 usually a smaller diameter than the anchor portion 36. for example, spherical valve-closing element section 46 has at its periphery, for example four flattened portions 50, 22 facilitate the flow of the fuel in the direction of the valve seat of the valve seat body 21st Zwischen dem Boden 40 des Sacklochabschnittes 44 und dem Ventilschließgliedabschnitt 46 ist ein Hohlraum 52 gebildet, in dem sich die bei der Herstellung der Schweißverbindung 48 zB mittels Laserschweißen entstehenden Schweißspritzer ansammeln. Between the bottom 40 of the blind hole portion 44 and the valve-closing element section 46 is a cavity 52 formed, the accumulate in the in the preparation of the weld joint 48, for example, by laser welding spatter generated. Diese Schweißspritzer können aus dem Hohlraum 52 nicht austreten und zB zu dem Ventilsitz 22 gelangen, so daß die Funktion des Ventils nicht gestört wird. This welding spatter can not escape from the cavity 52, and for example reach the valve seat 22, so that the function of the valve is not disturbed.
  • In Richtung der Ventillängsachse 11 zwischen dem Ankerabschnitt 36 und dem Boden 40 des Betätigungsteils 32 ist eine Mehrzahl von durch die Wandung des Ventilhülsenabschnittes 38 hindurchgehenden Durchgangsöffnungen 56 vorgesehen. In the direction of the longitudinal valve axis 11 between the anchor portion 36 and the bottom 40 of the operating part 32 is provided a plurality of passing through the wall of the valve sleeve portion 38 through openings 56th Diese Durchgangsöffnungen 56 ermöglichen ein Strömen des Brennstoffs durch die Strömungsbohrung 25 des Kerns 2 und die Längsöffnung 34 des Betätigungsteils 32 in Richtung des Ventilsitzes 22 des Ventilsitzkörpers 21. These through holes 56 allow the fuel to flow through the flow bore 25 of the core 2 and the longitudinal opening 34 of the actuating part 32 in the direction of the valve seat 22 of the valve seat body 21st
  • Das aus dem Ankerabschnitt 36 und dem Ventilhülsenabschnitt 38 bestehende Betätigungsteil 32 und auch der Ventilschließgliedabschnitt 46 der Ventilnadel 58 sind durch Spritzgießen und anschließendes Sintern hergestellt. The from the anchor portion 36 and the valve sleeve section 38 existing actuator portion 32 and the valve closure member portion 46 of the valve needle 58 are made by injection molding and subsequent sintering. Die Figur 4 zeigt in vereinfachter Art und Weise das erfindungsgemäße Verfahren zur Herstellung einer Ventilnadel. 4 shows in a simplified manner, the inventive method for producing a valve needle. Das auch als Metal-Injection-Molding (MIM) bezeichnete Verfahren umfaßt die Herstellung von Formteilen aus einem Metallpulver mit einem Bindemittel, zB einem Kunststoffbinäemittel beispielsweise auf konventionellen Kunststoffspritzgießmaschinen und das nachfolgende Entfernen des Bindemittels und Sintern des verbleibenden Metallpulvergerüstes. Referred to as Metal Injection Molding (MIM) process comprising the production of molded parts from a metal powder with a binder, for example a Kunststoffbinäemittel example, conventional plastic injection molding machines and the subsequent removal of the binder and sintering the remaining metal powder skeleton. Die Zusammensetzung des Metallpulvers kann dabei auf einfache Weise auf optimale magnetische Eigenschaften des aus Ankerabschnitt 36 und Ventilhülsenabschnitt 38 bestehenden Betätigungsteils 32 oder des Ventilschließgliedabschnittes 46 abgestimmt werden. The composition of the metal powder can thereby be tuned to optimum magnetic properties of the group consisting of anchor portion 36 and the valve sleeve portion 38 of actuating member 32 or the valve closure member portion 46 in a simple manner. Schwefel und/oder Kohlenstoff in dem Metallpulver können vermieden werden. Sulfur and / or carbon in the metal powder can be avoided. Zunächst wird das Metallpulver 61 mit dem als Bindemittel 62 verwendeten Kunststoff in einer Mischvorrichtung 63 gemischt und homogenisiert. First, the metal powder is mixed with 61 to 62 plastic used as the binder in a mixing device 63 and homogenized. Dieses Gemisch wird nun in einer Granuliervorrichtung 64 zu einem Granulat aufbereitet und in an sich bekannter Art und Weise mittels einer Kunststoffspritzgießmaschine 65 zu einem Formteil 66 weiterverarbeitet. This mixture is then processed in a pelletizer 64 to form a granulate and further processed in per se known manner by means of a plastics injection molding 65 to a 66th Aus dem spritzgegossenen Formteil 66 werden anschließend die Bestandteile des Kunststoffbinäemittels 62 durch thermische Verfahren beispielsweise unter Schutzgaseinfluß entfernt. the components of the Kunststoffbinäemittels 62 are then removed by thermal processes, for example under influence of inert gas from the injection-molded part 66th Das verbleibende Materialgerüst des Formteils 66 besteht nun zu ca. 60 Volumenprozent aus Metall. The remaining material skeleton of the molded article 66 is now about 60 percent by volume of metal. Um die Dichte des Formteils 66 zu erhöhen, wird das Formteil beispielsweise unter Schutzgaseinfluß in einer Sintervorrichtung 68 gesintert. The density of the shaped part to increase 66, the molding is, for example, sintered in a sintering apparatus 68 under influence of inert gas. Der Sintervorgang kann aber auch unter Wasserstoffeinfluß oder in einem Vakuum vorgenommen werden. but the sintering process can also be hydrogen influence or be made in a vacuum. Bei Bedarf kann das Formteil 66 dann durch heißisostatisches Pressen nachverdichtet werden, um den Anteil der Poren im Gefüge des Betätigungsteils 32 bzw. der Ventilnadel 58 auf etwa 1 % zu reduzieren. If necessary, the molded part 66 may be then densified by hot isostatic pressing to increase the proportion of the pores in the structure of the operating part 32 and the valve needle 58 to about 1% reduction.
  • Die Magnetspule 1 ist von wenigstens einem, beispielsweise als Bügel ausgebildeten, als ferromagnetisches Element dienenden Leitelement 81 wenigstens teilweise umgeben, das mit seinem einen Ende an dem Kern 2 und mit seinem anderen Ende an dem Düsenträger 19 anliegt und mit diesen zB durch Schweißen oder Löten verbunden ist. The coil 1 is surrounded at least partially by at least one, for example embodied as a bracket, serves as a ferromagnetic element guide element 81 which rests with its one end to the core 2 and with its other end to the nozzle carrier 19 and using this for example by welding or soldering, connected is. Ein Teil des Ventils ist von einer Kunststoffummantelung 83 umschlossen, die sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 mit Anschlußstecker 6 und das wenigstens eine Leitelement 81 erstreckt. A portion of the valve is surrounded by a plastic sheath 83, which extend from the core 2 starting extending least one conductive element 81 in the axial direction via the magnetic coil 1 with connector 6 and.
  • Das Betätigungsteil 32 gemäß Figur 2 ist derart ausgebildet, daß sich der Ventilhülsenabschnitt 38 ausgehend von dem Ankerabschnitt 36 in Richtung des Ventilschließgliedabschnittes 46 kegelstumpfförmig verjüngt. The actuating member 32 according to Figure 2 is designed such that the valve sleeve portion 38, starting tapered frusto-conical portion of the armature 36 toward the valve closing member section 46th Diese konische Form des Ventilhülsenabschnittes 38 erleichtert die Entformung des Betätigungsteiles 32 aus den zu seiner Herstellung verwendeten Werkzeugen, zB aus einer Form der Kunststoffspritzgießmaschine 65 oder der Sintervorrichtung 68. In der Längsöffnung 34 des Betätigungsteils 32 sind beispielsweise vier sich in Richtung der Ventillängsachse 11 erstreckende Ausnehmungen 85 ausgebildet, die eine Verringerung des Gewichts der Ventilnadel 58 ermöglichen, ohne ihre mechanische Festigkeit zu gefährden. This conical shape of the valve sleeve portion 38 facilitates the demolding of the operating member 32 from the used for its production tools, for example of one form of the injection molding machine 65 or the sintering apparatus 68. In the longitudinal opening 34 of the operating member 32 are, for example, four extending in the direction of the longitudinal valve axis 11 recesses 85 configured to allow a reduction in weight of the valve needle 58, without jeopardizing its mechanical strength. Zwischen jeweils zwei Ausnehmungen 85 werden auf diese Weise an der Wandung der Längsöffnung 34 des Betätigungsteils 32 in radialer Richtung nach innen weisende Stege 87 ausgeformt, die mit ihren dem Ventilschließgliedabschnitt 46 abgewandten Ende gemeinsam den Halteabsatz 30 für die Rückstellfeder 26 bilden. Between each two recesses 85 are formed in this manner on the wall of the longitudinal opening 34 of the actuating part 32 in the radial direction inwardly directed webs 87, which end with their valve closing member section 46 facing away together form the retaining shoulder 30 for the return spring 26th
  • Bei dem Ausführungsbeispiel einer erfindungsgemaßen Ventilnadel 58 nach Figur 3 sind Ankerabschnitt 36, Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 als ein Teil nach dem oben beschriebenen MIM-Verfahren hergestellt. In the embodiment of an inventive valve needle 58 of Figure 3, the anchor portion 36, the valve sleeve portion 38 and valve-closing element section 46 are made MIM-method as a part by the process described above. Dabei erstreckt sich vorteilhafterweise die Längsöffnung 34 bis in den Ventilschließgliedabschnitt 46. Schweißverbindungen sind bei dem Ausführungsbeispiel nach Figur 3 nicht vorhanden. In this case, advantageously, the longitudinal opening 34 extends to 46 in the valve-closing element section welded joints are not present in the embodiment according to FIG. 3
  • Die neue Ventilnadel mit einem durch Spritzgießen und anschließendes Sintern hergestellten, aus Ankerabschnitt 36 und Ventilhülsenabschnitt 38 bestehenden Betätigungsteil 32 und mit dem ebenfalls zugleich gefertigten Ventilschließglidabschnitt 46 hat den Vorteil einer sehr einfachen und kostengünstigen Herstellung, bei der der Schweißarbeitsgang zwischen Ankerabschnitt 36 und Ventilhülsenabschnitt 38 und zwischen Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 entfällt. produced the new valve needle with an injection molding, followed by sintering, from the anchor portion 36 and the valve sleeve portion 38 existing actuator portion 32 and with the likewise at the same time made Ventilschließglidabschnitt 46 has the advantage of a very simple and cost-effective production, in which the welding operation between the anchor portion 36 and the valve sleeve portion 38 and deleted between the valve sleeve portion 38 and valve-closing element section 46th

Claims (7)

  1. Valve needle for an electromagnetically actuated valve, in particular for an injection valve for fuel injection systems of internal combustion engines, which injection valve has a core (2), a solenoid coil (1) and a fixed valve seat (22) with which the valve needle (58) comprising an armature section (36), a valve sleeve section (38) and a valve-closing element section (46) interacts, the valve sleeve section (38) connecting the armature section (36) to the valve-closing element section (46) and a longitudinal opening (34) extending through the armature section (36) and the valve sleeve section (38), and the armature section (36), the valve sleeve section (38) and the valve-closing element section (46) of the valve needle (58) being manufactured as one part, characterized in that the armature section (36), valve sleeve section (38) and valve-closing element section (46) of the valve needle (58) are composed of sintered material and are manufactured according to the metal-injection-moulding method.
  2. Valve needle according to Claim 1, characterized in that the valve sleeve section (38) tapers conically in the direction of the valve-closing element section (46) starting from the armature section (36).
  3. Valve needle according to Claim 1 or 2, characterized in that cut-outs (85) extending in the direction of a valve longitudinal axis (11) are made in the wall of the longitudinal opening (34) of the valve sleeve section (38).
  4. Method for manufacturing a valve needle designed according to one of Claims 1 to 3, which valve needle comprises an armature section (36), a valve-closing element section (46) and a valve sleeve section (38) which connects the armature section (36) to the valve-closing element section (46), the armature section (36), the valve sleeve section (38) and the valve-closing element section (46) being constructed as one part, characterized in that, in accordance with the metal-injection-moulding method, in a first method step a metal powder (61) and a binding agent (62) are mixed with one another and homogenized, in a second method step, by means of injection-moulding, a moulded part (66) comprising the armature section (36), the valve sleeve section (38) and the valve-closing element section (46) is manufactured, in a third method step the binding agent (62) is removed from the moulded part (66) and in a fourth method step the moulded part (66) is sintered.
  5. Method according to Claim 4, characterized in that a plastic is used as binding agent.
  6. Method according to Claim 5, characterized in that the binding agent is removed from the moulded part (66) by means of a thermal treatment of this moulded part (66).
  7. Method according to Claims 4 to 6, characterized in that after the sintering the moulded part (66) is hot isostatically moulded.
EP19930918902 1992-09-11 1993-08-20 Valve needle for an electromagnetically controlled valve and process for producing the same Expired - Lifetime EP0612375B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19924230376 DE4230376C1 (en) 1992-09-11 1992-09-11
DE4230376 1992-09-11
PCT/DE1993/000759 WO1994007024A1 (en) 1992-09-11 1993-08-20 Valve needle for an electromagnetically controlled valve and process for producing the same

Publications (2)

Publication Number Publication Date
EP0612375A1 EP0612375A1 (en) 1994-08-31
EP0612375B1 true EP0612375B1 (en) 1997-06-18

Family

ID=6467717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930918902 Expired - Lifetime EP0612375B1 (en) 1992-09-11 1993-08-20 Valve needle for an electromagnetically controlled valve and process for producing the same

Country Status (6)

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US (1) US5566920A (en)
EP (1) EP0612375B1 (en)
JP (1) JPH07501377A (en)
DE (1) DE4230376C1 (en)
ES (1) ES2103485T3 (en)
WO (1) WO1994007024A1 (en)

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Also Published As

Publication number Publication date
EP0612375A1 (en) 1994-08-31
DE4230376C1 (en) 1993-04-22
JPH07501377A (en) 1995-02-09
ES2103485T3 (en) 1997-09-16
WO1994007024A1 (en) 1994-03-31
US5566920A (en) 1996-10-22

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