EP0871822B1 - Electromagnetically controlled valve - Google Patents

Electromagnetically controlled valve Download PDF

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Publication number
EP0871822B1
EP0871822B1 EP97924897A EP97924897A EP0871822B1 EP 0871822 B1 EP0871822 B1 EP 0871822B1 EP 97924897 A EP97924897 A EP 97924897A EP 97924897 A EP97924897 A EP 97924897A EP 0871822 B1 EP0871822 B1 EP 0871822B1
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EP
European Patent Office
Prior art keywords
valve
connecting part
valve seat
middle region
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97924897A
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German (de)
French (fr)
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EP0871822A1 (en
Inventor
Ferdinand Reiter
Hubert Stier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0871822A1 publication Critical patent/EP0871822A1/en
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    • 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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an electromagnetically operable valve according to the preamble of claim 1.
  • a valve needle for an electromagnetically operable valve consisting of an armature, a valve closure member and the armature with the z. B.
  • spherical valve closure member connecting sleeve-shaped connecting part with fixed connections of the individual needle components z. B. are achieved by laser welding.
  • the armature engages around the connecting part completely radially and at least partially axially, since the connecting part is fixed in a continuous longitudinal opening of the armature.
  • the connecting part itself also has a continuous inner longitudinal opening in which fuel can flow in the direction of the valve closure member, which then exits near the valve closure member through introduced in the wall of the connecting part, radially extending transverse openings.
  • the tubular connecting part has over its entire axial length a constant diameter, so that viewed in the axial direction throughout circular cross section is present, which is interrupted only by a narrow longitudinal slot and transverse openings.
  • an electromagnetically operable valve which has a valve needle, which is also composed of an armature, a valve closure member and a connecting both needle components connecting part.
  • the connecting part is made of semi-finished profile and allows fluid flow only outside the profile.
  • the profile arms of the profiled connecting part are designed so that there are cross, Y, triangular, circular section and other cross sections. Due to the massive training of the semi-finished profile made of connecting parts, the mass of the valve needle is relatively large.
  • the electromagnetically actuated valve according to the invention with the features of claim 1 has the advantage that in a simple manner cost-effective reduction of the mass of the valve is achieved with respect to valves of the same size.
  • This is inventively achieved in that a connecting part of a valve needle is used as a punching-bending part made of sheet metal over at least 75% of the total length of its axial extent has an open, in cross-section eg deviating from a circular shape profile having a smaller outer circumference than the perimeters of the annular profile of the ends of the connecting part or profiles of comparable known connecting parts or valve pins.
  • Another advantage of the valve needle according to the invention lies in the ease of manufacture by bending and stamping processes.
  • the formation of the profiled connection part can lead to a mass reduction of about 30% compared to continuously tubular formed with annular cross-section connecting parts or an even greater mass reduction compared to massively executed valve needles.
  • This mass saving is particularly important for elongated valves where the valve's injection point is far superior.
  • the Abspritz Scheme ranges so z. B. in the intake passage of an internal combustion engine clearly.
  • a wall wetting of the intake pipe can be easily avoided by a possible targeted spraying on one or more intake valves, whereby the exhaust emission of the internal combustion engine and the fuel consumption can be reduced. Since the wear forces on the valve seat of the valve behave proportionally to the mass of the valve needle, reducing the mass can significantly reduce the wear on the valve seat.
  • Particularly suitable profiles for the connecting part of the valve needle have U-, C-, V- or clasp-shaped cross sections. These geometries of the connecting parts have a high resistance to bending and buckling.
  • valve seat carrier is therefore a thin-walled non-magnetic sleeve, in the inner longitudinal opening, the valve needle moves axially.
  • FIG. 2 shows a section through the valve needle and the valve seat carrier along the line II-II in Figure 1 and Figures 3a to 3d embodiments of profiles of the connecting parts with U, C, V and clasp-shaped cross-sections.
  • the electromagnetically operable valve in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines, for example, shown in FIG. 1 has a tubular core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet nozzle, as a so-called inner pole.
  • a bobbin 3 receives a winding of the magnetic coil 1 and allows in conjunction with the core 2 a particularly compact design of the injection valve in the field of solenoid coil 1.
  • the core 2 is stepped and has in the axial extent of the magnetic coil 1 a paragraph 5, as Stop surface for an anchor 6 is used.
  • the core 2 extends over the Paragraph 5 also in the downstream direction, so that a downstream of the solenoid assembly arranged sleeve-shaped valve seat carrier 10 need not be connected in the region of the paragraph 5 with the core 2.
  • the core 2 has a likewise tubular, but a much thinner wall than the other wall thickness of the core 2 having magnetic throttle 13.
  • a lower core end 14 which in turn has a much greater wall thickness as the throttle point 13 has.
  • valve seat carrier 10 In the serving as a connecting part and a tubular and thin-walled sleeve performing valve seat carrier 10 extends a longitudinal opening 18, which is also formed concentrically to the valve longitudinal axis 15.
  • the valve seat carrier 10 With the lower core end 14 of Kerns 2, the valve seat carrier 10 is sealed, for example, by welding and surrounds it with an upper sleeve portion 24 a portion of the core end 14 axially.
  • the z. B. nonmagnetic steel valve seat carrier 10 encloses next to the core end 14 and at its opposite end a valve seat body 29 and a spray hole attached to it 34.
  • the valve seat carrier 10 is elongated, wherein the valve seat carrier 10 even half or more of the entire axial extension length of Can make injection valve.
  • the injection point of the injection valve is far superior. In conventional installation positions of injection valves in internal combustion engines, this means that the injection valve extends with its downstream end and thus with its metering and Abspritz Scheme significantly into the intake manifold. As a result, wall wetting of the intake pipe can be largely avoided by targeted spraying on one or more intake valves and as a result, the exhaust emission of the internal combustion engine can be reduced.
  • the actuation of the injection valve takes place in a known manner electromagnetically.
  • the electromagnetic circuit with the solenoid coil 1, the core 2 and the armature 6.
  • the armature 6 is with the valve closing body 21 remote from the end 40 of the connecting part 19 'connected by a weld and aligned with the core 2.
  • the armature 6 wraps around the end 40 of the connecting part 19 'at least partially.
  • the core 2 opposite end of the valve seat carrier 10 is in the longitudinal opening 18 of the z.
  • cylindrical valve seat body 29 having a fixed valve seat 30, mounted by welding tight.
  • valve closing body 21 To guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 6 along the valve longitudinal axis 15 serves a guide opening 32 of the valve seat body 29.
  • the armature 6 is guided even during the axial movement in the core 2, especially in the region of the magnetic throttle 13.
  • At the outer periphery of the armature 6 can z. B. be provided a specially trained guide surface.
  • the spherical valve closing body 21 cooperates with the valve seat 30 of the valve seat body 29, which tapers in the direction of the flow in the direction of flow.
  • cup-shaped spray perforated disk 34 At its the valve closing body 21 facing away from the valve seat body 29 with the z. B.
  • the spray perforated disk 34 has at least one, for example, four ejection openings 35 formed by eroding, punching or etching. A retaining edge of the spray perforated disk 34 is conically bent outwards, so that it bears against the inner wall of the valve seat support 10 defined by the longitudinal opening 18, wherein a radial Pressing is present.
  • the spray perforated disk 34 is connected to the wall of the valve seat carrier 10, for example, by a circumferential and dense z. B. connected by means of a laser weld. An immediate flow of the fuel into an intake line of the internal combustion engine outside of the injection openings 35 is avoided by the weld seams on the spray perforated disk 34.
  • the depth of insertion of the valve seat body 29 with the spray perforated disk 34 into the valve seat carrier 10 determines the size of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 is not energized Solenoid 1 fixed by the system of the valve closing body 21 on the valve seat 30, while the other end position of the valve needle 19 results in energized solenoid coil 1 by the plant of the armature 6 on the heel 5 of the core 2.
  • the magnetic coil 1 is surrounded by at least one, for example, designed as a bracket and serving as ferromagnetic element guide element 45 which surrounds the magnetic coil 1 in the circumferential direction at least partially and with its two ends to the core 2 upstream and downstream of the throttle body 13 and with this z , B. is connected by welding, soldering or gluing.
  • the electromagnetically actuated valve is largely enclosed outside the valve seat carrier 10 with a plastic extrusion coating 50, which extends from the core 2 in the axial direction via the magnetic coil 1 and the at least one guide element 45 to the valve seat carrier 10, wherein the at least one guide element 45 completely axially and is covered in the circumferential direction.
  • Kunststoffumspritzung 50 includes, for example, a mitangespritzter electrical connector 52. About the electrical connector 52, the electrical contacting of the magnetic coil 1 and thus their excitation.
  • valve seat carrier 10 Through the use of the relatively cheap sleeve for the valve seat carrier 10, it is possible to dispense with conventional in injection valves rotary parts, which are due to their larger outer diameter voluminous and more expensive to manufacture than the valve seat carrier 10. This is particularly advantageous if, as in the case of the present valve, the discharge point should be far advanced / upstream since the material savings compared to known solid valve seat carriers or nozzle holders are considerable.
  • the thin-walled valve seat carrier 10 is For example, have been formed by deep drawing, as a non-magnetic material, for. As a stainless steel CrNi steel is used.
  • the elongated valve seat carrier 10 has near the lower end 55 of the plastic extrusion coating 50, formed by folding, outwardly peripheral annular bead 56.
  • annular groove 57 A arranged in the annular groove 57 sealing ring 58 serves to seal between the circumference of the injector and a valve receptacle, not shown, for example Intake line of the internal combustion engine.
  • the Abspritzddling the injector downstream of the valve closing body 21 is z. B. far further from the solenoid coil 1 and the stopper area of the core 2 and armature 6 as an inlet-side end 59 of the core 2 and the entire injection valve of the solenoid coil 1 and the abovementioned abutment region.
  • the valve needle 19 has a considerable length compared to the entire valve length, the z. B. extends over more than half the valve length and should be carried out by suitable measures particularly light, but still stable and inexpensive.
  • the connecting part 19 'z. B made of austenitic steel.
  • the two axial ends 20 and 40 of the connecting part 19 ' are designed to facilitate attachment of the armature 6 and the valve closing body 21 to them in a known manner tubular, so that in section results in an annular profile, which is interrupted for example only by a narrow axially extending slot 60.
  • the connecting part 19 ' resembles a known from DE 40 08 675 A valve needle. Over the greater part of the extension length of the connecting part 19 ', however, another profile is provided.
  • a central, at least 75% with respect to the total length range 61 of the connecting part 19 ' has an embossed profile whose cross-section (extent, dimension) is significantly smaller than the cross-sections of the ends 20 and 40. This is achieved in that in the area 61 of outer circumference of the connecting part 19 'relative to the outer periphery of the ends 20 and 40 is reduced.
  • the outer circumference is to be understood as meaning only one contour line which runs away from the valve longitudinal axis 15 and thus does not encompass the respective inner wall facing the valve longitudinal axis 15.
  • FIG. 2 shows, as a sectional illustration through the valve seat carrier 10 and the connecting part 19 'along the line II-II in FIG. 1, an example of a possible profile of the connecting part 19'.
  • the profiles according to the invention of the connecting part 19 ' are characterized in that they are open on one side and thus have U-, V-, C-shaped or possessed by these slightly modified or modified forms cross-sections.
  • the connecting parts 19 ' may have cross sections according to FIGS. 3a to 3d.
  • connecting parts 19 ' are stamped and bent parts, which are formed from originally flat sheet metal parts.
  • both the ends 20 and 40 with their circular cross-sections and the central regions 61 with their special cross-sections can be formed.
  • the final contour of the connecting part 19 ' is achieved by bending and stamping processes.
  • a mass reduction of about 30% is possible.
  • the wear forces on the valve seat 30 can be reduced in an advantageous manner by the lower mass of the valve needle 19.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem elektromagnetisch, betätigbaren Ventil nach der Gattung des Anspruch 1.The invention relates to an electromagnetically operable valve according to the preamble of claim 1.

Aus der DE 40 08 675 A ist bereits eine Ventilnadel für ein elektromagnetisch betätigbares Ventil bekannt, die aus einem Anker, einem Ventilschließglied und einem den Anker mit dem z. B. kugelförmigen Ventilschließglied verbindenden hülsenförmigen Verbindungsteil besteht, wobei feste Verbindungen der einzelnen Nadelbauteile z. B. durch Laserschweißen erzielt sind. Der Anker umgreift das Verbindungsteil vollständig radial und zumindest teilweise axial, da das Verbindungsteil in einer durchgehenden Längsöffnung des Ankers befestigt ist. Das Verbindungsteil weist selbst auch eine durchgehende innere Längsöffnung auf, in der Brennstoff in Richtung zum Ventilschließglied strömen kann, der dann nahe des Ventilschließglieds durch in der Wandung des Verbindungsteils eingebrachte, radial verlaufende Queröffnungen austritt. Das rohrförmige Verbindungsteil weist über seine gesamte axiale Länge einen konstanten Durchmesser auf, so daß ein in axialer Richtung gesehen durchweg kreisförmiger Querschnitt vorhanden ist, der nur durch einen schmalen Längsschlitz und Queröffnungen unterbrochen ist.From DE 40 08 675 A, a valve needle for an electromagnetically operable valve is already known, consisting of an armature, a valve closure member and the armature with the z. B. spherical valve closure member connecting sleeve-shaped connecting part, with fixed connections of the individual needle components z. B. are achieved by laser welding. The armature engages around the connecting part completely radially and at least partially axially, since the connecting part is fixed in a continuous longitudinal opening of the armature. The connecting part itself also has a continuous inner longitudinal opening in which fuel can flow in the direction of the valve closure member, which then exits near the valve closure member through introduced in the wall of the connecting part, radially extending transverse openings. The tubular connecting part has over its entire axial length a constant diameter, so that viewed in the axial direction throughout circular cross section is present, which is interrupted only by a narrow longitudinal slot and transverse openings.

Aus der DE 44 20 176 A ist bereits ein elektromagnetisch betätigbares Ventil bekannt, das eine Ventilnadel besitzt, die sich ebenfalls aus einem Anker, einem Ventilschließglied und einem beide Nadelbauteile verbindenden Verbindungsteil zusammensetzt. Das Verbindungsteil ist dabei aus einem Profilhalbzeug hergestellt und erlaubt eine Fluidströmung nur außerhalb des Profils. Die Profilarme des profilierten Verbindungsteils sind so ausgeführt, daß sich kreuz-, Y-, dreieck-, kreisabschnittförmige und andere Querschnitte ergeben. Durch die massive Ausbildung der aus Profilhalbzeugen gefertigten Verbindungsteile ist die Masse der Ventilnadel vergleichsweise groß.From DE 44 20 176 A an electromagnetically operable valve is already known, which has a valve needle, which is also composed of an armature, a valve closure member and a connecting both needle components connecting part. The connecting part is made of semi-finished profile and allows fluid flow only outside the profile. The profile arms of the profiled connecting part are designed so that there are cross, Y, triangular, circular section and other cross sections. Due to the massive training of the semi-finished profile made of connecting parts, the mass of the valve needle is relatively large.

Des weiteren ist aus der EP 0 690 224 A bereits ein Brennstoffeinspritzventil bekannt, das eine Düsenöffnung besitzt, die im eingebauten Zustand des Ventils bereits im Inneren eines Ansaugkanals liegt, so daß unter Vermeidung einer Wandbenetzung ein Abspritzen weitgehend direkt auf ein Einlaßventil einer Brennkraftmaschine möglich ist. Eine Vorverlagerung des Abspritzpunktes erhöht unter Umständen durch die Verlängerung einzelner Ventilbauteile die Masse und das Volumen des Einspritzventils.Furthermore, from EP 0 690 224 A a fuel injection valve is already known, which has a nozzle opening, which is already in the installed state of the valve in the interior of a suction channel, so that while avoiding wall wetting a spray largely directly to an intake valve of an internal combustion engine is possible , A forward displacement of the Abspritzpunktes increases possibly by the extension of individual valve components, the mass and the volume of the injection valve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße elektromagnetisch betätigbare Ventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, daß auf einfache Art und Weise kostengünstig eine Reduzierung der Masse des Ventils gegenüber Ventilen gleicher Baugröße erzielt wird. Dies wird erfindungsgemäß dadurch erreicht, daß ein Verbindungsteil einer Ventilnadel als Stanz-Biege-Teil aus Blech verwendet ist, das über mindestens 75% der Gesamtlänge seiner axialen Erstreckung ein offenes, im Querschnitt ein z.B. von einer Kreisringform abweichendes Profil besitzt, das einen kleineren äußeren Umfang hat als die Umfänge des kreisringförmigen Profils der Enden des Verbindungsteils bzw. von Profilen vergleichbarer bekannter Verbindungsteile oder Ventilnadeln. Ein weiterer Vorteil der erfindungsgemäßen Ventilnadel liegt in der einfachen Herstellbarkeit durch Biege- und Prägeprozesse. Die Ausbildung des profilierten Verbindungsteils kann zu einer Massenreduzierung von ca. 30 % gegenüber durchgehend rohrförmig mit kreisringförmigem Querschnitt ausgebildeten Verbindungsteilen bzw. einer noch größeren Massenreduzierung gegenüber massiv ausgeführten Ventilnadeln führen. Diese Einsparung an Masse ist besonders bedeutsam für langgestreckte Ventile, bei denen der Abspritzpunkt des Ventils weit vorgesetzt ist. Der Abspritzbereich reicht so z. B. in den Ansaugkanal einer Brennkraftmaschine deutlich hinein. Eine Wandbenetzung des Ansaugrohrs kann durch ein ermöglichtes gezieltes Abspritzen auf ein oder mehrere Einlaßventile auf einfache Weise vermieden werden, wodurch die Abgasemission der Brennkraftmaschine und der Brennstoffverbrauch reduziert werden. Da sich die Verschleißkräfte am Ventilsitz des Ventils proportional zur Masse der Ventilnadel verhalten, kann durch die Reduzierung der Masse eine deutliche Verschleißverringerung am Ventilsitz erreicht werden.The electromagnetically actuated valve according to the invention with the features of claim 1 has the advantage that in a simple manner cost-effective reduction of the mass of the valve is achieved with respect to valves of the same size. This is inventively achieved in that a connecting part of a valve needle is used as a punching-bending part made of sheet metal over at least 75% of the total length of its axial extent has an open, in cross-section eg deviating from a circular shape profile having a smaller outer circumference than the perimeters of the annular profile of the ends of the connecting part or profiles of comparable known connecting parts or valve pins. Another advantage of the valve needle according to the invention lies in the ease of manufacture by bending and stamping processes. The formation of the profiled connection part can lead to a mass reduction of about 30% compared to continuously tubular formed with annular cross-section connecting parts or an even greater mass reduction compared to massively executed valve needles. This mass saving is particularly important for elongated valves where the valve's injection point is far superior. The Abspritzbereich ranges so z. B. in the intake passage of an internal combustion engine clearly. A wall wetting of the intake pipe can be easily avoided by a possible targeted spraying on one or more intake valves, whereby the exhaust emission of the internal combustion engine and the fuel consumption can be reduced. Since the wear forces on the valve seat of the valve behave proportionally to the mass of the valve needle, reducing the mass can significantly reduce the wear on the valve seat.

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

Besonders geeignete Profile für das Verbindungsteil der Ventilnadel weisen U-, C-, V- oder spangenförmige Querschnitte auf. Diese Geometrien der Verbindungsteile besitzen eine hohe Belastbarkeit gegen Biegung und Knickung.Particularly suitable profiles for the connecting part of the valve needle have U-, C-, V- or clasp-shaped cross sections. These geometries of the connecting parts have a high resistance to bending and buckling.

Von Vorteil ist es ebenso, weitere langgestreckte Bauteile des Ventils möglichst massearm auszubilden. Als Ventilsitzträger eignet sich deshalb eine dünnwandige nichtmagnetische Hülse, in deren innerer Längsöffnung sich die Ventilnadel axial bewegt.It is also advantageous to design further elongated components of the valve with as little mass as possible. As a valve seat carrier is therefore a thin-walled non-magnetic sleeve, in the inner longitudinal opening, the valve needle moves axially.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Ventils, Figur 2 einen Schnitt durch die Ventilnadel und den Ventilsitzträger entlang der Linie II-II in Figur 1 und Figuren 3a bis 3d Ausführungsbeispiele von Profilen der Verbindungsteile mit U-, C-, V- und spangenförmigen Querschnitten.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. 2 shows a section through the valve needle and the valve seat carrier along the line II-II in Figure 1 and Figures 3a to 3d embodiments of profiles of the connecting parts with U, C, V and clasp-shaped cross-sections.

Beschreibung der AusführungsbeispieleDescription of the 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 rohrförmigen Kern 2 als sogenannten Innenpol. Ein Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht in Verbindung mit dem Kern 2 einen besonders kompakten Aufbau des Einspritzventils im Bereich der Magnetspule 1. Der Kern 2 ist gestuft ausgeführt und besitzt im axialen Erstreckungsbereich der Magnetspule 1 einen Absatz 5, der als Anschlagfläche für einen Anker 6 dient. Im Gegensatz zu bekannten Einspritzventilen verläuft der Kern 2 über den Absatz 5 hinaus weiter in stromabwärtiger Richtung, so daß ein stromabwärts der Magnetspulenbaugruppe angeordneter hülsenförmiger Ventilsitzträger 10 nicht im Bereich des Absatzes 5 mit dem Kern 2 verbunden sein muß. Vom Absatz 5 ausgehend besitzt der Kern 2 eine ebenfalls rohrförmige, jedoch eine wesentlich dünnere Wandung als die sonstige Wandungsstärke des Kerns 2 aufweisende magnetische Drosselstelle 13. An die Drosselstelle 13 schließt sich in stromabwärtiger Richtung ein unteres Kernende 14 an, das wiederum eine deutlich größere Wandstärke als die Drosselstelle 13 besitzt.The electromagnetically operable valve in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines, for example, shown in FIG. 1 has a tubular core 2, which is surrounded by a magnetic coil 1 and serves as a fuel inlet nozzle, as a so-called inner pole. A bobbin 3 receives a winding of the magnetic coil 1 and allows in conjunction with the core 2 a particularly compact design of the injection valve in the field of solenoid coil 1. The core 2 is stepped and has in the axial extent of the magnetic coil 1 a paragraph 5, as Stop surface for an anchor 6 is used. In contrast to known injectors, the core 2 extends over the Paragraph 5 also in the downstream direction, so that a downstream of the solenoid assembly arranged sleeve-shaped valve seat carrier 10 need not be connected in the region of the paragraph 5 with the core 2. Starting from the paragraph 5, the core 2 has a likewise tubular, but a much thinner wall than the other wall thickness of the core 2 having magnetic throttle 13. At the throttle point 13 is followed in the downstream direction, a lower core end 14, which in turn has a much greater wall thickness as the throttle point 13 has.

Aus dem Absatz 5 des Kerns 2 geht konzentrisch zu einer Ventillängsachse 15, um die sich auch der Kern 2 und der Ventilsitzträger 10 z. B. konzentrisch erstrecken, die magnetische Drosselstelle 13 hervor. In diesem bei bekannten Einspritzventilen dem Kernende unmittelbar stromabwärts folgenden Bereich sind beim Stand der Technik metallene, unmagnetische Zwischenteile vorgesehen, die für eine magnetische Trennung von Kern 2 und Ventilsitzträger 10 sorgen. Durch die Ausbildung des Kerns 2 mit einer magnetischen Drosselstelle 13 kann auf ein solches nichtmagnetisches Zwischenteil verzichtet werden.From the paragraph 5 of the core 2 is concentric with a valve longitudinal axis 15, around which also the core 2 and the valve seat carrier 10 z. B. concentric, the magnetic throttle 13 out. In this area, which is immediately downstream of the core end in the case of known injection valves, metal, non-magnetic intermediate parts are provided in the prior art which ensure magnetic separation of core 2 and valve seat carrier 10. Due to the design of the core 2 with a magnetic throttle body 13 can be dispensed with such a non-magnetic intermediate part.

In dem als Verbindungsteil dienenden und eine rohrförmige und dünnwandige Hülse darstellenden Ventilsitzträger 10 verläuft eine Längsöffnung 18, die ebenfalls konzentrisch zu der Ventillängsachse 15 ausgebildet ist. In der Längsöffnung 18 ist eine erfindungsgemäße Ventilnadel 19 mit einem langgestreckten Verbindungsteil 19' angeordnet, die an ihrem stromabwärtigen Ende 20 mit einem z. B. kugelförmigen Ventilschließkörper 21, an dessen Umfang beispielsweise fünf Abflachungen 22 zum Vorbeiströmen eines Fluids, insbesondere von Brennstoff, vorgesehen sind, beispielsweise durch Schweißen verbunden ist. Mit dem unteren Kernende 14 des Kerns 2 ist der Ventilsitzträger 10 beispielsweise durch Schweißen dicht verbunden und umgibt dabei mit einem oberen Hülsenabschnitt 24 einen Teil des Kernendes 14 axial.In the serving as a connecting part and a tubular and thin-walled sleeve performing valve seat carrier 10 extends a longitudinal opening 18, which is also formed concentrically to the valve longitudinal axis 15. In the longitudinal opening 18, a valve needle 19 according to the invention with an elongated connecting part 19 'is arranged, which at its downstream end 20 with a z. B. spherical valve closing body 21, on the circumference, for example, five flats 22 are provided for flowing past a fluid, in particular fuel, is connected, for example by welding. With the lower core end 14 of Kerns 2, the valve seat carrier 10 is sealed, for example, by welding and surrounds it with an upper sleeve portion 24 a portion of the core end 14 axially.

Der z. B. aus nichtmagnetischem Stahl bestehende Ventilsitzträger 10 umschließt neben dem Kernende 14 auch an seinem gegenüberliegenden Ende einen Ventilsitzkörper 29 und eine an ihm befestigte Spritzlochscheibe 34. Der Ventilsitzträger 10 ist langgestreckt ausgeführt, wobei der Ventilsitzträger 10 sogar die Hälfte oder mehr der gesamten axialen Erstreckungslänge des Einspritzventils ausmachen kann. Mit dieser Ausbildung des Ventilsitzträgers 10 wird der Abspritzpunkt des Einspritzventils weit vorgesetzt. Bei üblichen Einbaulagen von Einspritzventilen in Brennkraftmaschinen bedeutet dies, daß das Einspritzventil mit seinem stromabwärtigen Ende und damit mit seinem Zumeß- und Abspritzbereich deutlich in das Ansaugrohr hineinreicht. Hierdurch kann durch das gezielte Abspritzen auf ein oder mehrere Einlaßventile eine Wandbenetzung des Ansaugrohrs weitgehend vermieden und als Folge daraus die Abgasemission der Brennkraftmaschine reduziert werden.The z. B. nonmagnetic steel valve seat carrier 10 encloses next to the core end 14 and at its opposite end a valve seat body 29 and a spray hole attached to it 34. The valve seat carrier 10 is elongated, wherein the valve seat carrier 10 even half or more of the entire axial extension length of Can make injection valve. With this design of the valve seat carrier 10, the injection point of the injection valve is far superior. In conventional installation positions of injection valves in internal combustion engines, this means that the injection valve extends with its downstream end and thus with its metering and Abspritzbereich significantly into the intake manifold. As a result, wall wetting of the intake pipe can be largely avoided by targeted spraying on one or more intake valves and as a result, the exhaust emission of the internal combustion engine can be reduced.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise elektromagnetisch. Zur axialen Bewegung der alle in der Längsöffnung 18 bewegbaren Teile umfassenden Ventilnadel 19 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 25 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2 und dem Anker 6. Der Anker 6 ist mit dem dem Ventilschließkörper 21 abgewandten Ende 40 des Verbindungsteils 19' durch eine Schweißnaht verbunden und auf den Kern 2 ausgerichtet. Der Anker 6 umhüllt dabei das Ende 40 des Verbindungsteils 19' zumindest teilweise. In das stromabwärts liegende, dem Kern 2 abgewandte Ende des Ventilsitzträgers 10 ist in der Längsöffnung 18 der z. B. zylinderförmige Ventilsitzkörper 29, der einen festen Ventilsitz 30 aufweist, durch Schweißen dicht montiert.The actuation of the injection valve takes place in a known manner electromagnetically. For axial movement of all the movable in the longitudinal opening 18 parts valve needle 19 and thus to open against the spring force of a return spring 25 and closing the injector is the electromagnetic circuit with the solenoid coil 1, the core 2 and the armature 6. The armature 6 is with the valve closing body 21 remote from the end 40 of the connecting part 19 'connected by a weld and aligned with the core 2. The armature 6 wraps around the end 40 of the connecting part 19 'at least partially. In the downstream, the core 2 opposite end of the valve seat carrier 10 is in the longitudinal opening 18 of the z. B. cylindrical valve seat body 29 having a fixed valve seat 30, mounted by welding tight.

Zur Führung des Ventilschließkörpers 21 während der Axialbewegung der Ventilnadel 19 mit dem Anker 6 entlang der Ventillängsachse 15 dient eine Führungsöffnung 32 des Ventilsitzkörpers 29. Der Anker 6 wird selbst während der Axialbewegung im Kern 2, besonders im Bereich der magnetischen Drosselstelle 13 geführt. Am äußeren Umfang des Ankers 6 kann dafür z. B. eine besonders ausgebildete Führungsfläche vorgesehen sein. Der kugelförmige Ventilschließkörper 21 wirkt mit dem sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitz 30 des Ventilsitzkörpers 29 zusammen. An seiner dem Ventilschließkörper 21 abgewandten Stirnseite ist der Ventilsitzkörper 29 mit der z. B. topfförmigen Spritzlochscheibe 34 fest verbunden. Die Spritzlochscheibe 34 besitzt wenigstens eine, beispielsweise vier durch Erodieren, Stanzen oder Ätzen ausgeformte Abspritzöffnungen 35. Ein Halterand der Spritzlochscheibe 34 ist konisch nach außen gebogen, so daß dieser an die durch die Längsöffnung 18 bestimmten inneren Wandung des Ventilsitzträgers 10 anliegt, wobei eine radiale Pressung vorliegt. Die Spritzlochscheibe 34 ist mit der Wandung des Ventilsitzträgers 10 beispielsweise durch eine umlaufende und dichte z. B. mittels eines Lasers erzeugte Schweißnaht verbunden. Ein unmittelbares Durchströmen des Brennstoffs in eine Ansaugleitung der Brennkraftmaschine außerhalb der Abspritzöffnungen 35 wird durch die Schweißnähte an der Spritzlochscheibe 34 vermieden.To guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 6 along the valve longitudinal axis 15 serves a guide opening 32 of the valve seat body 29. The armature 6 is guided even during the axial movement in the core 2, especially in the region of the magnetic throttle 13. At the outer periphery of the armature 6 can z. B. be provided a specially trained guide surface. The spherical valve closing body 21 cooperates with the valve seat 30 of the valve seat body 29, which tapers in the direction of the flow in the direction of flow. At its the valve closing body 21 facing away from the valve seat body 29 with the z. B. cup-shaped spray perforated disk 34 firmly connected. The spray perforated disk 34 has at least one, for example, four ejection openings 35 formed by eroding, punching or etching. A retaining edge of the spray perforated disk 34 is conically bent outwards, so that it bears against the inner wall of the valve seat support 10 defined by the longitudinal opening 18, wherein a radial Pressing is present. The spray perforated disk 34 is connected to the wall of the valve seat carrier 10, for example, by a circumferential and dense z. B. connected by means of a laser weld. An immediate flow of the fuel into an intake line of the internal combustion engine outside of the injection openings 35 is avoided by the weld seams on the spray perforated disk 34.

Die Einschubtiefe des Ventilsitzkörpers 29 mit der Spritzlochscheibe 34 in den Ventilsitzträger 10 bestimmt die Größe des Hubs der Ventilnadel 19. Dabei ist die eine Endstellung der Ventilnadel 19 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 21 am Ventilsitz 30 festgelegt, während sich die andere Endstellung der Ventilnadel 19 bei erregter Magnetspule 1 durch die Anlage des Ankers 6 am Absatz 5 des Kerns 2 ergibt. Die Magnetspule 1 ist von wenigstens einem, beispielsweise als Bügel ausgebildeten und als ferromagnetisches Element dienenden Leitelement 45 umgeben, das die Magnetspule 1 in Umfangsrichtung wenigstens teilweise umgibt sowie mit seinen beiden Enden an dem Kern 2 stromaufwärts und stromabwärts der Drosselstelle 13 anliegt und mit diesem z. B. durch Schweißen, Löten bzw. Kleben verbindbar ist.The depth of insertion of the valve seat body 29 with the spray perforated disk 34 into the valve seat carrier 10 determines the size of the stroke of the valve needle 19. In this case, the one end position of the valve needle 19 is not energized Solenoid 1 fixed by the system of the valve closing body 21 on the valve seat 30, while the other end position of the valve needle 19 results in energized solenoid coil 1 by the plant of the armature 6 on the heel 5 of the core 2. The magnetic coil 1 is surrounded by at least one, for example, designed as a bracket and serving as ferromagnetic element guide element 45 which surrounds the magnetic coil 1 in the circumferential direction at least partially and with its two ends to the core 2 upstream and downstream of the throttle body 13 and with this z , B. is connected by welding, soldering or gluing.

Das elektromagnetisch betätigbare Ventil ist außerhalb des Ventilsitzträgers 10 weitgehend mit einer Kunststoffumspritzung 50 umschlossen, die sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 und das wenigstens eine Leitelement 45 bis zum Ventilsitzträger 10 erstreckt, wobei das wenigstens eine Leitelement 45 vollständig axial und in Umfangsrichtung überdeckt ist. Zu dieser Kunststoffumspritzung 50 gehört beispielsweise ein mitangespritzter elektrischer Anschlußstecker 52. Über den elektrischen Anschlußstecker 52 erfolgt die elektrische Kontaktierung der Magnetspule 1 und damit deren Erregung.The electromagnetically actuated valve is largely enclosed outside the valve seat carrier 10 with a plastic extrusion coating 50, which extends from the core 2 in the axial direction via the magnetic coil 1 and the at least one guide element 45 to the valve seat carrier 10, wherein the at least one guide element 45 completely axially and is covered in the circumferential direction. For this Kunststoffumspritzung 50 includes, for example, a mitangespritzter electrical connector 52. About the electrical connector 52, the electrical contacting of the magnetic coil 1 and thus their excitation.

Durch den Einsatz der relativ billigen Hülse für den Ventilsitzträger 10 wird es möglich, auf in Einspritzventilen übliche Drehteile, die aufgrund ihres größeren Außendurchmessers voluminöser und bei der Herstellung teurer als der Ventilsitzträger 10 sind, zu verzichten. Dies ist besonders vorteilhaft, wenn wie bei dem vorliegenden Ventil der Abspritzpunkt weit vorgesetzt/vorgelagert sein soll, da die Materialeinsparung gegenüber bekannten massiven Ventilsitzträgern oder Düsenhaltern erheblich ist. Der dünnwandige Ventilsitzträger 10 ist beispielsweise durch Tiefziehen ausgebildet worden, wobei als Werkstoff ein nichtmagnetisches Material, z. B. ein rostbeständiger CrNi-Stahl verwendet ist. Der langgestreckte Ventilsitzträger 10 weist nahe des unteren Endes 55 der Kunststoffumspritzung 50 eine durch Faltung gebildete, nach außen stehende umlaufende Ringwulst 56 auf. Das Ende 55 der Kunststoffumspritzung 50 und die Ringwulst 56 bilden zusammen mit der äußeren Wandung des Ventilsitzträgers 10 in diesem Bereich eine Ringnut 57. Ein in der Ringnut 57 angeordneter Dichtring 58 dient zur Abdichtung zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme, beispielsweise der Ansaugleitung der Brennkraftmaschine.Through the use of the relatively cheap sleeve for the valve seat carrier 10, it is possible to dispense with conventional in injection valves rotary parts, which are due to their larger outer diameter voluminous and more expensive to manufacture than the valve seat carrier 10. This is particularly advantageous if, as in the case of the present valve, the discharge point should be far advanced / upstream since the material savings compared to known solid valve seat carriers or nozzle holders are considerable. The thin-walled valve seat carrier 10 is For example, have been formed by deep drawing, as a non-magnetic material, for. As a stainless steel CrNi steel is used. The elongated valve seat carrier 10 has near the lower end 55 of the plastic extrusion coating 50, formed by folding, outwardly peripheral annular bead 56. The end 55 of the plastic extrusion coating 50 and the annular bead 56 together with the outer wall of the valve seat carrier 10 in this area an annular groove 57. A arranged in the annular groove 57 sealing ring 58 serves to seal between the circumference of the injector and a valve receptacle, not shown, for example Intake line of the internal combustion engine.

Der Wunsch nach einem weit vorgesetzten bzw. vorgelagerten Abspritzpunkt, der im eingebauten Zustand des Einspritzventils deutlich in eine Ansaugleitung hineinragen kann, erfordert Maßnahmen zur Herabsetzung der Volumina bzw. Massen der nun langgestreckten Bauteile des Einspritzventils. Der Abspritzpunkt des Einspritzventils stromabwärts des Ventilschließkörpers 21 liegt z. B. deutlich weiter entfernt von der Magnetspule 1 bzw. dem Anschlagbereich von Kern 2 und Anker 6 als ein zulaufseitiges Ende 59 des Kerns 2 bzw. des gesamten Einspritzventils von der Magnetspule 1 bzw. dem oben genannten Anschlagbereich. Neben dem Ventilsitzträger 10 weist auch die Ventilnadel 19 eine im Vergleich zur gesamten Ventillänge erhebliche Länge auf, die sich z. B. über mehr als die Hälfte der Ventillänge erstreckt und durch geeignete Maßnahmen besonders leicht, aber trotzdem stabil und kostengünstig ausgeführt sein soll.The desire for a far superior or upstream Abspritzpunkt that can protrude significantly in the installed state of the injector into a suction line, requires measures to reduce the volumes or masses of the now elongated components of the injector. The Abspritzpunkt the injector downstream of the valve closing body 21 is z. B. far further from the solenoid coil 1 and the stopper area of the core 2 and armature 6 as an inlet-side end 59 of the core 2 and the entire injection valve of the solenoid coil 1 and the abovementioned abutment region. In addition to the valve seat carrier 10, the valve needle 19 has a considerable length compared to the entire valve length, the z. B. extends over more than half the valve length and should be carried out by suitable measures particularly light, but still stable and inexpensive.

Um die Hubänderung in Abhängigkeit von der Temperatur minimal zu halten, ist das Verbindungsteil 19' z. B. aus austenitischem Stahl gefertigt. Die beiden axialen Enden 20 und 40 des Verbindungsteils 19' sind zur einfacheren Befestigung des Ankers 6 und des Ventilschließkörpers 21 an ihnen in bereits bekannter Weise rohrförmig ausgeführt, so daß sich im Schnitt ein kreisringförmiges Profil ergibt, das beispielsweise nur durch einen schmalen axial verlaufenden Schlitz 60 unterbrochen ist. An seinen Enden 20 und 40 ähnelt das Verbindungsteil 19' einer aus der DE 40 08 675 A bekannten Ventilnadel. Über den größten Teil der Erstreckungslänge des Verbindungsteils 19' ist jedoch ein anderes Profil vorgesehen. Ein mittlerer, mindestens 75 % bezüglich der Gesamtlänge umfassender Bereich 61 des Verbindungsteils 19' besitzt ein geprägtes Profil, dessen Querschnitt (Ausmaß, Abmaß) deutlich geringer ist als die Querschnitte der Enden 20 und 40. Dies wird dadurch erreicht, daß im Bereich 61 der äußere Umfang des Verbindungsteils 19' gegenüber dem äußeren Umfang der Enden 20 und 40 verringert wird. Unter dem äußeren Umfang soll dabei nur eine Konturlinie verstanden werden, die von der Ventillängsachse 15 abgewandt verläuft und also die jeweils innere, der Ventillängsachse 15 zugewandte Wandung nicht mitumfaßt.In order to minimize the stroke change as a function of the temperature, the connecting part 19 'z. B. made of austenitic steel. The two axial ends 20 and 40 of the connecting part 19 'are designed to facilitate attachment of the armature 6 and the valve closing body 21 to them in a known manner tubular, so that in section results in an annular profile, which is interrupted for example only by a narrow axially extending slot 60. At its ends 20 and 40, the connecting part 19 'resembles a known from DE 40 08 675 A valve needle. Over the greater part of the extension length of the connecting part 19 ', however, another profile is provided. A central, at least 75% with respect to the total length range 61 of the connecting part 19 'has an embossed profile whose cross-section (extent, dimension) is significantly smaller than the cross-sections of the ends 20 and 40. This is achieved in that in the area 61 of outer circumference of the connecting part 19 'relative to the outer periphery of the ends 20 and 40 is reduced. The outer circumference is to be understood as meaning only one contour line which runs away from the valve longitudinal axis 15 and thus does not encompass the respective inner wall facing the valve longitudinal axis 15.

Die Figur 2 zeigt als Schnittdarstellung durch den Ventilsitzträger 10 und das Verbindungsteil 19' entlang der Linie II-II in Figur 1 ein Beispiel für ein mögliches Profil des Verbindungsteils 19'. Die erfindungsgemäßen Profile des Verbindungsteils 19' zeichnen sich dadurch aus, daß sie einseitig offen sind und somit U-, V-, C-förmige bzw. von diesen leicht abgewandelte bzw. modifizierte Formen besitzende Querschnitte aufweisen. Neben dem in Figur 2 dargestellten krampenförmigen Profil können die Verbindungsteile 19' Querschnitte gemäß den Figuren 3a bis 3d besitzen.FIG. 2 shows, as a sectional illustration through the valve seat carrier 10 and the connecting part 19 'along the line II-II in FIG. 1, an example of a possible profile of the connecting part 19'. The profiles according to the invention of the connecting part 19 'are characterized in that they are open on one side and thus have U-, V-, C-shaped or possessed by these slightly modified or modified forms cross-sections. In addition to the cramp-shaped profile shown in FIG. 2, the connecting parts 19 'may have cross sections according to FIGS. 3a to 3d.

Dabei handelt es sich um ein U-förmiges Profil (Figur 3a), bei dem Variationen durch Abrunden der Ecken möglich sind, ein C-förmiges Profil (Figur 3b), das auch weiter geschlossen sein und so z. B. 75 % eines vollständig kreisringförmigen Querschnitts darstellen kann, ein V-förmiges Profil (Figur 3c), bei dem die beiden Schenkel 62 entweder spitz direkt zueinander stehen oder die beiden Schenkel 62 über einen abgerundeten bzw. geraden Grundbereich 63 verbunden sind, ein greiferähnliches, klauenförmiges, krampenförmiges bzw. spangenförmiges Profil (Figuren 2 und 3d), bei dem die Schenkel 62 gerade oder abgerundet verlaufen und an ihren Enden beispielsweise abgewinkelte, umgebogene, hakenähnliche Knickungen 64 besitzen.It is a U-shaped profile (Figure 3a), in which variations by rounding the corners are possible, a C-shaped profile (Figure 3b), which also be further closed and z. B. 75% of a completely annular cross-section, a V-shaped profile (Figure 3c), in which the two legs 62 are either pointed directly to each other or the two legs 62 are connected via a rounded or straight base portion 63, a gripper-like , claw-shaped, cramp-shaped or clasp-shaped profile (Figures 2 and 3d), in which the legs 62 extend straight or rounded and at their ends, for example, angled, bent, hook-like bends 64 have.

Bei allen diesen Beispielen der Verbindungsteile 19' handelt es sich um Stanz-Biege-Teile, die aus ursprünglich ebenen Blechteilen geformt werden. In einem speziellen Biegewerkzeug lassen sich sowohl die Enden 20 und 40 mit ihren kreisringförmigen Querschnitten als auch die mittleren Bereiche 61 mit ihren besonderen Querschnitten umformen. Die endgültige Kontur des Verbindungsteils 19' wird durch Biege- und Prägeprozesse erreicht. Im Vergleich zu durchgehend kreisringförmig profilierten Verbindungsteilen 19' ist erfindungsgemäß eine Massenreduzierung von ca. 30 % möglich. Die Verschleißkräfte am Ventilsitz 30 können in vorteilhafter Weise durch die geringere Masse der Ventilnadel 19 reduziert werden.In all these examples of the connecting parts 19 'are stamped and bent parts, which are formed from originally flat sheet metal parts. In a special bending tool, both the ends 20 and 40 with their circular cross-sections and the central regions 61 with their special cross-sections can be formed. The final contour of the connecting part 19 'is achieved by bending and stamping processes. Compared to continuously annular profiled connecting parts 19 'according to the invention a mass reduction of about 30% is possible. The wear forces on the valve seat 30 can be reduced in an advantageous manner by the lower mass of the valve needle 19.

Claims (9)

  1. Electromagnetically operable valve, in particular an injection valve for fuel injection systems of internal combustion engines, having a core (2) surrounded by a solenoid (1), having an armature (6) facing the core (2), having a fixed valve seat (30) with which a valve needle (19) comprising the armature (6), a connecting part (19') and a valve-closing member (21), cooperates, the connecting part (19') being a bent sheet-metal punched part and the two ends (20, 40), to which the armature (6) and the valve-closing member (21) are permanently connected by means of the connecting part (19'), having a largely circumferential annular cross section, a middle region (61), situated between the two ends (20, 40), of the connecting part (19') having an open profile having a smaller outer circumference than the outer circumference of the annular cross section of the two ends (20, 40), characterized in that the middle region (61) makes up at least 75% of the total length of the connecting part (19').
  2. Valve according to Claim 1, characterized in that the middle region (61) of the connecting part (19') has a U-shaped profile.
  3. Valve according to Claim 1, characterized in that the middle region (61) of the connecting part (19') has a C-shaped profile.
  4. Valve according to Claim 1, characterized in that the middle region (61) of the connecting part (19') has a V-shaped profile.
  5. Valve according to Claim 1, characterized in that the middle region (61) of the connecting part (19') has a profile in the shape of a gripper, claw, cramp or clasp.
  6. Valve according to one of the preceding claims, characterized in that the valve needle (19) has a length which represents more than half the total length of the valve.
  7. Valve according to Claim 1, characterized in that the injection point of the valve downstream of the valve-closing member (21) is situated further from the solenoid (1) than an inlet-side end (59) of the valve is situated from the solenoid (1).
  8. Valve according to one of the preceding claims, characterized in that the connecting part (19') can be produced by means of bending processes and embossing processes.
  9. Valve according to Claim 1, characterized in that a valve seat support (10) accommodating the fixed valve seat (30) is designed as a thin-walled sleeve.
EP97924897A 1996-08-09 1997-05-16 Electromagnetically controlled valve Expired - Lifetime EP0871822B1 (en)

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DE19632196 1996-08-09
DE19632196A DE19632196B4 (en) 1996-08-09 1996-08-09 Electromagnetically actuated valve
PCT/DE1997/001006 WO1998006939A1 (en) 1996-08-09 1997-05-16 Electromagnetically controlled valve

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EP0871822B1 true EP0871822B1 (en) 2006-08-23

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EP (1) EP0871822B1 (en)
JP (1) JP2000500218A (en)
KR (1) KR19990064075A (en)
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DE19632196B4 (en) 2004-11-04
KR19990064075A (en) 1999-07-26
RU2177075C2 (en) 2001-12-20
CN1198799A (en) 1998-11-11
CN1077652C (en) 2002-01-09
EP0871822A1 (en) 1998-10-21
DE59712713D1 (en) 2006-10-05
DE19632196A1 (en) 1998-02-12
JP2000500218A (en) 2000-01-11
US5975436A (en) 1999-11-02
WO1998006939A1 (en) 1998-02-19

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