EP0718491B1 - Method for manufacturing a valve - Google Patents

Method for manufacturing a valve Download PDF

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Publication number
EP0718491B1
EP0718491B1 EP95114688A EP95114688A EP0718491B1 EP 0718491 B1 EP0718491 B1 EP 0718491B1 EP 95114688 A EP95114688 A EP 95114688A EP 95114688 A EP95114688 A EP 95114688A EP 0718491 B1 EP0718491 B1 EP 0718491B1
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EP
European Patent Office
Prior art keywords
valve seat
valve
shaped body
seat body
spray disc
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
EP95114688A
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German (de)
French (fr)
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EP0718491A1 (en
Inventor
Peter Dipl.-Ing. Romann (Fh)
Siegfried Dr. Ing. Rohde
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0718491A1 publication Critical patent/EP0718491A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • the invention is based on a method according to the genus Claim 1.
  • a valve closing body with one in a valve seat body trained valve seat surface cooperates. Downstream the valve seat surface is cup-shaped in a recess trained spray plate attached after has a bulge downstream.
  • the invention Method with the features of claim 1 has the advantage that in a simple manner the collecting space between the valve closing body and the bulge the spray plate reduced in volume and without abrupt changes in cross-section can be formed, whereby a more favorable flow through the collecting space and achieved better running behavior of the internal combustion engine becomes.
  • Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail.
  • 1 shows in one first embodiment a partially shown Fuel injector with an inventive manufactured spray plate, Figures 2 to 4 individual Manufacturing steps of the exemplary embodiment according to FIG. 1, Figures 5 to 7 individual manufacturing steps according to a second embodiment.
  • FIG. 1 shows an example of what is otherwise already known Valve in the form of a fuel injector for Fuel injection systems from mixture compressors spark-ignited internal combustion engines partially shown that is designed according to the invention as the first exemplary embodiment.
  • the injection valve has a tubular valve housing 1 in which A longitudinal opening 3 concentric with a valve longitudinal axis 2 is trained. In the longitudinal opening 3 is a z.
  • tubular valve needle 5 arranged on her downstream end 6 with a spherical Valve closing body 7, for example five on the circumference circular flats 8 are provided, is connected.
  • the injection valve is actuated in a known manner for example electromagnetic.
  • For the axial movement of the Valve needle 5 and thus for opening against the spring force of a Return spring, not shown, or closing the Injection valve serves an indicated electromagnetic Circle with a magnetic coil 10, an armature 11 and a core 12.
  • the armature 11 is connected to the valve closing body 7 opposite end of the valve needle 5 by z. B. a weld connected by means of a laser and aligned with the core 12.
  • valve seat body 16 To guide the valve closing body 7 during the axial movement serves a guide opening 15 of a valve seat body 16.
  • the scope of the Valve seat body 16 has a slightly smaller one Diameter on than the longitudinal opening 3 of the valve housing 1.
  • An its one, the valve closing body 7 facing away, lower The end face 17 is the valve seat body 16 with a base part 20 a z.
  • cup-shaped spray plate 21st concentrically and firmly connected so that the bottom part 20 with its upper end face 19 on the lower end face 17 of Valve seat body 16 abuts.
  • the bottom part 20 of the spray perforated disk 21 In its central area 24 the bottom part 20 of the spray perforated disk 21 has at least one, for example four formed by eroding or stamping Spray openings 25 on.
  • a circumferential holding edge 26 which is in extends axially away from the valve seat body 16 and is bent conically outwards until its end 27. Since the Circumferential diameter of the valve seat body 16 is smaller than that Diameter of the longitudinal opening 3 of the valve housing 1 is only between the longitudinal opening 3 and the slightly conical externally curved holding edge 26 of the spray plate 21 a radial pressure.
  • the insertion depth of the valve seat body 16 and cup-shaped Spray plate 21 existing valve seat part in the Longitudinal opening 3 determines the default stroke Valve needle 5, since the one end position of the valve needle 5 at non-excited solenoid 10 by the system of Valve closing body 7 on a valve seat surface 29 of the Valve seat body 16 is fixed.
  • the other end position of the Valve needle 5 is, for example, when solenoid 10 is excited fixed by the installation of the anchor 11 on the core 12. Of the Path between these two end positions of the valve needle 5 thus represents the hub.
  • the holding edge 26 of the spray disk 21 tightly and firmly connected to the wall of the longitudinal opening 3.
  • a circumferential weld seam 30 intended.
  • the bottom part 20 tightly the end face 17 of the valve seat body 16 connected.
  • valve seat body 16 and spray orifice plate 21 as well as from spray plate 21 and valve housing 1 required so that the fuel is not between the Longitudinal opening 3 of the valve housing 1 and the circumference of the Valve seat body 16 through to the spray openings 25 or between the longitudinal opening 3 of the valve seat support 1 and the Holding edge 26 of the cup-shaped spray perforated disk 21 therethrough directly into an air intake line of the internal combustion engine can flow.
  • the spherical valve closing body 7 acts with the in Direction of flow tapering in the shape of a truncated cone Valve seat surface 29 of the valve seat body 16 together, which in axial direction between the guide opening 15 and the lower End face 17 of the valve seat body 16 is formed.
  • Valve seat body 16 has a magnet coil 10 facing Valve seat body opening 34, which has a larger diameter has as the diameter of the guide opening 15 of the Valve seat body 16.
  • valve closing body 7 For exact guidance of the valve closing body 7 and thus the Valve needle 5 during the axial movement is the diameter the guide opening 15 formed so that the spherical Valve closing body 7 outside of its flattenings 8 Passing through guide opening 15 with a small radial distance.
  • the central area 24 of the bottom part 20 of the Spray plate 21 is in the downstream direction, that is in the direction pointing away from the valve closing body 7 the level of the bottom part 20 bent out so that there is a Bulge 36 results in the central area.
  • the valve seat surface 29 and the A bulge 37 is formed in the wall of the bulge 36, in the lifted off from the valve seat surface 29 Valve closing body 7 the fuel first arrives before he metered through the spray orifices 25 and into the Air intake line of the internal combustion engine is hosed down.
  • the bulge 36 is in the first embodiment Figure 1 formed in the form of a spherical shell, the inner wall 38 of the bulge 36 directly into the Valve seat surface 29, that is, without a shoulder, passes over.
  • the volume the collecting space 37 is by suitable choice of Course of the valve seat surface 29 and the inner wall 38 the bulge 36 with respect to the surface of the spherical valve closing body 37 as low as possible held.
  • FIGS 2 to 4 show in partial representations Process steps to achieve the bulge 36 and the Collecting space 37 according to the first embodiment Figure 1.
  • Figures 2 to 4 show in partial representations Process steps to achieve the bulge 36 and the Collecting space 37 according to the first embodiment Figure 1.
  • the same and equivalent parts find the same reference numerals as used in Figure 1 were used.
  • the valve housing 1 assembled state of the valve seat body 16 is initially which is completely flat, at least in its base part 20
  • Spray plate 21 with its upper end face 19 to the End face 17 of the valve seat body 16 created.
  • Which conical in the direction of flow in the form of a conical jacket tapered valve seat surface 29 ends directly at the upper end face 19 of the spray plate 21 and encloses the central region 24 of the spray orifice plate, from from which the spray openings 25 also emanate.
  • the Spray plate 21 is by means of the circumferential weld seam 31 outside the central area 24 close to the End face 17 of the valve seat body 16 connected.
  • a ball for example Valve closing body 7, as dashed in Figure 2 is inserted into the valve seat body 16, so he would on the upper face 19 of the spray orifice plate 21 but not with the valve seat surface 29 in Come into contact because of the diameter of the spherical Valve closing body 7 and the inclination of the valve seat surface 29 are designed so that the valve closing body 7 at System on the valve seat surface 29 on the end face 17 of the Valve seat body 16 protrudes.
  • valve closing body 7 a molded body 40 in the Valve seat body 16 inserted and to abut the upper Bring end face 19 of the spray orifice plate 21.
  • the Shaped body 40 has, for example, the same contour as that Valve closing body 7, that is in the embodiment Contour of a sphere, but it has a smaller one Cross section than the valve closing body 7. Then the Shaped body by means of in the direction of the spray orifice plate 21 acting on the molded body 40 force 41 so long the spray plate 21 moves until the Spray plate 21 in its central area 24 through plastic deformation the bulge 36 with the contour of the Shaped body 40 is formed and the inner wall 38 of the Bulge 36 directly into the wall of the Valve seat surface 29 merges.
  • the Radius of the spherical shaped body 40 may be chosen so that after completion of the bulge 36 a cone representing valve seat surface 29 tangentially into the adjacent inner wall 38 of the bulge 36 merges.
  • the one initially showing parallel walls Spray openings 25 deform at the Formation of the bulge 36 such that it in Flow direction a flared shape accept. So expanding in the direction of flow Spray openings, however, have the advantage that them to stable flows and a good one Perform fuel processing.
  • valve seat surface 29 and the cross section of the molded body 40 can also be chosen so that not only the Spray plate 21 in its central region 24 in the Generation of the bulge 36 is plastically deformed, but also an edge region of the valve seat body 16 in the Near the end face 17, which also gives an immediate seamless transition between the valve seat and the inner wall 38 of the bulge is generated. Finally, after removing the molded body 40, the Valve seat body in the longitudinal opening 3 of the valve housing 1 introduced and by means of the weld 30 in the above described way attached therein.
  • Figure 4 shows one Valve seat body 16 with an orifice plate attached to it 21, which has a bulge 36 produced according to the invention, in that of the adjacent valve seat surface 29 Valve closing body 7 projecting beyond the end face 17 extends, whereby a collecting space 37 with as much as possible low volume is achieved.
  • Shaped body 40 has approximately the cross section of the central one Area 24 or is slightly larger.
  • the conical contour of the shaped body 40 ' is now exposed to the force 41 moves the molded body downward and deforms it plastically the spray plate 21 in its central Area 24 so that there is a conical bulge 36 results, the inner wall 38 directly into the Valve seat surface 29 merges.
  • Figure 7 shows the conical Valve closing body 7 'when in contact with the valve seat surface 29, the tip over the end face 17 of the Valve seat body 16 into the conical bulge 36 protrudes, resulting in the smallest possible volume of the Collection room 37 results.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren nach der Gattung des Anspruches 1. Es ist bereits ein Einspritzventil zur Brennstoffeinspritzung bekannt (DE 38 41 142 A1), bei dem ein Ventilschließkörper mit einer in einem Ventilsitzkörper ausgebildeten Ventilsitzfläche zusammenwirkt. Stromabwärts der Ventilsitzfläche ist in einer Ausnehmung eine topfförmig ausgebildete Spritzlochscheibe befestigt, die nach stromabwärts eine Ausbuchtung aufweist.The invention is based on a method according to the genus Claim 1. There is already an injection valve Fuel injection known (DE 38 41 142 A1), in which a valve closing body with one in a valve seat body trained valve seat surface cooperates. Downstream the valve seat surface is cup-shaped in a recess trained spray plate attached after has a bulge downstream.

Durch die DE 42 21 185 A1 ist ebenfalls ein Brennstoffeinspritzventil mit einem Ventilsitzkörper bekannt, an dessen der Ventilsitzfläche stromabwärtiger Stirnfläche eine Spritzlochscheibe befestigt ist, die in ihrem mittleren Bereich eine nach stromabwärts gerichtete Ausbuchtung aufweist.From DE 42 21 185 A1 is also a Fuel injector with a valve seat body known, on the valve seat surface downstream Face of a perforated spray disk is attached, which in its central region is a downstream one Has bulge.

Bei diesen bekannten Brennstoffeinspritzventilen wird zwischen dem Ventilschließkörper, der Ventilsitzfläche, der Wandung des Ventilsitzkörpers und der Wandung der Ausbuchtung der Spritzlochscheibe ein Sammelraum eingeschlossen, der vor dem Abspritzen über die Abspritzöffnungen in der Spritzlochscheibe eine gewisse Brennstoffmenge aufnimmt. Diese Brennstoffmenge und damit der Sammelraum sollte so klein wie irgend möglich gehalten werden, denn nach dem Schließen des Ventiles wird in unerwünschter Weise durch den Unterdruck im Luftansaugsystem der Brennkraftmaschine bzw. durch Erwärmung der Brennstoff aus dem Sammelraum abgesaugt bzw. verdampft, was zu einer unerwünschten Veränderung der abgespritzten Brennstoffmenge führt, da bei erneuter Öffnung des Ventiles zunächst der Sammelraum mit Brennstoff gefüllt werden muß. Aus Fertigungs- und Toleranzgründen ergeben sich bei den bekannten Brennstoffeinspritzventilen relativ große Sammelräume, die neben den geschilderten Nachteilen auch noch dazu führen, daß an Absätzen im Sammelraum sogenannte "Totwasserzonen" in der Brennstoffströmung entstehen, die die Brennstoffzumessung und die Brennstoffstrahlen ungünstig beeinflussen.In these known fuel injection valves between the valve closing body, the valve seat surface, the Wall of the valve seat body and the wall of the Bulge of the spray hole disk a collecting room included who before hosing over the Spray openings in the spray plate a certain Takes up the amount of fuel. This amount of fuel and therefore the collection room should be kept as small as possible be because after closing the valve is in undesirable due to the negative pressure in the air intake system the internal combustion engine or by heating the fuel suctioned or evaporated from the collecting space, resulting in a undesirable change in the amount of fuel sprayed leads, because when the valve is opened again the Collection room must be filled with fuel. Out Manufacturing and tolerance reasons arise with the known fuel injectors relatively large Collection rooms, in addition to the disadvantages described still lead to so-called paragraphs in the collecting room "Dead water zones" arise in the fuel flow that fuel metering and fuel jets are unfavorable influence.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruches 1 hat demgegenüber den Vorteil, daß auf einfache Art und Weise der Sammelraum zwischen Ventilschließkörper und Ausbuchtung der Spritzlochscheibe in seinem Volumen verringert und ohne sprunghafte Querschnittsänderungen ausgebildet werden kann, wodurch eine günstigere Durchströmung des Sammelraumes und ein besseres Laufverhalten der Brennkraftmaschine erzielt wird.The invention Method with the features of claim 1 has the advantage that in a simple manner the collecting space between the valve closing body and the bulge the spray plate reduced in volume and without abrupt changes in cross-section can be formed, whereby a more favorable flow through the collecting space and achieved better running behavior of the internal combustion engine becomes.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 in einem ersten Ausführungsbeispiel ein teilweise dargestelltes Brennstoffeinspritzventil mit einer erfindungsgemäß hergestellten Spritzlochscheibe, Figuren 2 bis 4 einzelne Herstellungsschritte des Ausführungsbeispieles nach Figur 1, Figuren 5 bis 7 einzelne Herstellungsschritte gemäß eines zweiten Ausführungsbeispieles.Embodiments of the invention are in the drawing shown in simplified form and in the following Description explained in more detail. 1 shows in one first embodiment a partially shown Fuel injector with an inventive manufactured spray plate, Figures 2 to 4 individual Manufacturing steps of the exemplary embodiment according to FIG. 1, Figures 5 to 7 individual manufacturing steps according to a second embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist ein Beispiel eines sonst bereits bekannten Ventils in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt, das als erstes Ausführungsbeispiel erfindungsgemäß ausgebildet ist. Das Einspritzventil hat ein rohrförmiges Ventilgehäuse 1, in dem konzentrisch zu einer Ventil längsachse 2 eine Längsöffnung 3 ausgebildet ist. In der Längsöffnung 3 ist eine z. B. rohrförmige Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende 6 mit einem kugelförmigen Ventilschließkörper 7, an dessen Umfang beispielsweise fünf kreisförmige Abflachungen 8 vorgesehen sind, verbunden ist.FIG. 1 shows an example of what is otherwise already known Valve in the form of a fuel injector for Fuel injection systems from mixture compressors spark-ignited internal combustion engines partially shown that is designed according to the invention as the first exemplary embodiment. The injection valve has a tubular valve housing 1 in which A longitudinal opening 3 concentric with a valve longitudinal axis 2 is trained. In the longitudinal opening 3 is a z. B. tubular valve needle 5 arranged on her downstream end 6 with a spherical Valve closing body 7, for example five on the circumference circular flats 8 are provided, is connected.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise beispielsweise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen entgegen der Federkraft einer nicht dargestellten Rückstellfeder bzw. Schließen des Einspritzventils dient ein angedeuteter elektromagnetischer Kreis mit einer Magnetspule 10, einem Anker 11 und einem Kern 12. Der Anker 11 ist mit dem dem Ventilschließkörper 7 abgewandten Ende der Ventilnadel 5 durch z. B. eine Schweißnaht mittels eines Lasers verbunden und auf den Kern 12 ausgerichtet.The injection valve is actuated in a known manner for example electromagnetic. For the axial movement of the Valve needle 5 and thus for opening against the spring force of a Return spring, not shown, or closing the Injection valve serves an indicated electromagnetic Circle with a magnetic coil 10, an armature 11 and a core 12. The armature 11 is connected to the valve closing body 7 opposite end of the valve needle 5 by z. B. a weld connected by means of a laser and aligned with the core 12.

Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 15 eines Ventilsitzkörpers 16. In das stromabwärts liegende, dem Kern 11 abgewandte Ende des Ventilgehäuses 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsöffnung 3 der zylinderförmige Ventilsitzkörper 16 durch Schweißen dicht montiert. Der Umfang des Ventilsitzkörpers 16 weist einen geringfügig kleineren Durchmesser auf als die Längsöffnung 3 des Ventilgehäuses 1. An seiner einen, dem Ventilschließkörper 7 abgewandten, unteren Stirnseite 17 ist der Ventilsitzkörper 16 mit einem Bodenteil 20 einer z. B. topfförmig ausgebildeten Spritzlochscheibe 21 konzentrisch und fest verbunden, so daß das Bodenteil 20 mit seiner oberen Stirnseite 19 an der unteren Stirnseite 17 des Ventilsitzkörpers 16 anliegt. In seinem zentralen Bereich 24 weist das Bodenteil 20 der Spritzlochscheibe 21 wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 25 auf.To guide the valve closing body 7 during the axial movement serves a guide opening 15 of a valve seat body 16. In the downstream end of the core 11 facing away from the core Valve housing 1 is concentric with the valve longitudinal axis 2 extending longitudinal opening 3 of the cylindrical valve seat body 16 tightly assembled by welding. The scope of the Valve seat body 16 has a slightly smaller one Diameter on than the longitudinal opening 3 of the valve housing 1. An its one, the valve closing body 7 facing away, lower The end face 17 is the valve seat body 16 with a base part 20 a z. B. cup-shaped spray plate 21st concentrically and firmly connected so that the bottom part 20 with its upper end face 19 on the lower end face 17 of Valve seat body 16 abuts. In its central area 24 the bottom part 20 of the spray perforated disk 21 has at least one, for example four formed by eroding or stamping Spray openings 25 on.

An das Bodenteil 20 der topfförmigen Spritzlochscheibe 21 schließt sich ein umlaufender Halterand 26 an, der sich in axialer Richtung dem Ventilsitzkörper 16 abgewandt erstreckt und bis zu seinem Ende 27 hin konisch nach außen gebogen ist. Da der Umfangsdurchmesser des Ventilsitzkörpers 16 kleiner als der Durchmesser der Längsöffnung 3 des Ventilgehäuses 1 ist, liegt nur zwischen der Längsöffnung 3 und dem leicht konisch nach außen gebogenen Halterand 26 der Spritzlochscheibe 21 eine radiale Pressung vor.On the bottom part 20 of the cup-shaped spray perforated disk 21 is followed by a circumferential holding edge 26, which is in extends axially away from the valve seat body 16 and is bent conically outwards until its end 27. Since the Circumferential diameter of the valve seat body 16 is smaller than that Diameter of the longitudinal opening 3 of the valve housing 1 is only between the longitudinal opening 3 and the slightly conical externally curved holding edge 26 of the spray plate 21 a radial pressure.

Die Einschubtiefe des aus Ventilsitzkörper 16 und topfförmiger Spritzlochscheibe 21 bestehenden Ventilsitzteils in die Längsöffnung 3 bestimmt die Voreinstellung des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an einer Ventilsitzfläche 29 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar.The insertion depth of the valve seat body 16 and cup-shaped Spray plate 21 existing valve seat part in the Longitudinal opening 3 determines the default stroke Valve needle 5, since the one end position of the valve needle 5 at non-excited solenoid 10 by the system of Valve closing body 7 on a valve seat surface 29 of the Valve seat body 16 is fixed. The other end position of the Valve needle 5 is, for example, when solenoid 10 is excited fixed by the installation of the anchor 11 on the core 12. Of the Path between these two end positions of the valve needle 5 thus represents the hub.

An seinem Ende 27 ist der Halterand 26 der Spritzlochscheibe 21 mit der Wandung der Längsöffnung 3 dicht und fest verbunden. Hierfür ist zwischen dem Ende 27 des Halterandes 26 und der Wandung der Längsöffnung 3 eine umlaufende Schweißnaht 30 vorgesehen. Außerhalb des zentralen Bereiches 24 ist mit einer weiteren umlaufenden Schweißnaht 31 das Bodenteil 20 dicht mit der Stirnseite 17 des Ventilsitzkörpers 16 verbunden. Eine dichte Verbindung von Ventilsitzkörper 16 und Spritzlochscheibe 21 sowie von Spritzlochscheibe 21 und Ventilgehäuse 1 ist erforderlich, damit der Brennstoff nicht zwischen der Längsöffnung 3 des Ventilgehäuses 1 und dem Umfang des Ventilsitzkörpers 16 hindurch zu den Abspritzöffnungen 25 oder zwischen der Längsöffnung 3 des Ventilsitzträgers 1 und dem Halterand 26 der topfförmigen Spritzlochscheibe 21 hindurch unmittelbar in eine Luftansaugleitung der Brennkraftmaschine strömen kann.At its end 27 is the holding edge 26 of the spray disk 21 tightly and firmly connected to the wall of the longitudinal opening 3. For this is between the end 27 of the holding edge 26 and the Wall of the longitudinal opening 3 a circumferential weld seam 30 intended. Outside the central area 24 is with a further circumferential weld 31 the bottom part 20 tightly the end face 17 of the valve seat body 16 connected. A tight connection of valve seat body 16 and spray orifice plate 21 as well as from spray plate 21 and valve housing 1 required so that the fuel is not between the Longitudinal opening 3 of the valve housing 1 and the circumference of the Valve seat body 16 through to the spray openings 25 or between the longitudinal opening 3 of the valve seat support 1 and the Holding edge 26 of the cup-shaped spray perforated disk 21 therethrough directly into an air intake line of the internal combustion engine can flow.

Der kugelförmige Ventilschließkörper 7 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 29 des Ventilsitzkörpers 16 zusammen, die in axialer Richtung zwischen der Führungsöffnung 15 und der unteren Stirnseite 17 des Ventilsitzkörpers 16 ausgebildet ist. Der Ventilsitzkörper 16 weist der Magnetspule 10 zugewandt eine Ventilsitzkörperöffnung 34 auf, die einen größeren Durchmesser besitzt als den Durchmesser der Führungsöffnung 15 des Ventilsitzkörpers 16.The spherical valve closing body 7 acts with the in Direction of flow tapering in the shape of a truncated cone Valve seat surface 29 of the valve seat body 16 together, which in axial direction between the guide opening 15 and the lower End face 17 of the valve seat body 16 is formed. Of the Valve seat body 16 has a magnet coil 10 facing Valve seat body opening 34, which has a larger diameter has as the diameter of the guide opening 15 of the Valve seat body 16.

Zur exakten Führung des Ventilschließkörpers 7 und damit der Ventilnadel 5 während der Axialbewegung ist der Durchmesser der Führungsöffnung 15 so ausgebildet, daß der kugelförmige Ventilschließkörper 7 außerhalb seiner Abflachungen 8 die Führungsöffnung 15 mit geringem radialem Abstand durchragt. For exact guidance of the valve closing body 7 and thus the Valve needle 5 during the axial movement is the diameter the guide opening 15 formed so that the spherical Valve closing body 7 outside of its flattenings 8 Passing through guide opening 15 with a small radial distance.

Der zentrale Bereich 24 des Bodenteils 20 der Spritzlochscheibe 21 ist in stromabwärtiger Richtung, also in von dem Ventilschließkörper 7 wegweisender Richtung aus der Ebene des Bodenteils 20 herausgebogen, so daß sich eine Ausbuchtung 36 im zentralen Bereich ergibt. Zwischen dem Ventilschließkörper 7, der Ventilsitzfläche 29 und der Wandung der Ausbuchtung 36 wird ein Sammelraum 37 gebildet, in den bei von der Ventilsitzfläche 29 abgehobenem Ventilschließkörper 7 der Brennstoff zunächst gelangt, bevor er durch die Abspritzöffnungen 25 zugemessen und in die Luftansaugleitung der Brennkraftmaschine abgespritzt wird. Die Ausbuchtung 36 ist beim ersten Ausführungsbeispiel nach Figur 1 in Form einer Kugelschale ausgebildet, wobei die innere Wandung 38 der Ausbuchtung 36 unmittelbar in die Ventilsitzfläche 29, also ohne Absatz, übergeht. Das Volumen des Sammelraums 37 ist dabei durch geeignete Wahl des Verlaufs der Ventilsitzfläche 29 und der inneren Wandung 38 der Ausbuchtung 36 in bezug auf die Oberfläche des kugelförmigen Ventilschließkörpers 37 so gering wie möglich gehalten.The central area 24 of the bottom part 20 of the Spray plate 21 is in the downstream direction, that is in the direction pointing away from the valve closing body 7 the level of the bottom part 20 bent out so that there is a Bulge 36 results in the central area. Between the Valve closing body 7, the valve seat surface 29 and the A bulge 37 is formed in the wall of the bulge 36, in the lifted off from the valve seat surface 29 Valve closing body 7 the fuel first arrives before he metered through the spray orifices 25 and into the Air intake line of the internal combustion engine is hosed down. The bulge 36 is in the first embodiment Figure 1 formed in the form of a spherical shell, the inner wall 38 of the bulge 36 directly into the Valve seat surface 29, that is, without a shoulder, passes over. The volume the collecting space 37 is by suitable choice of Course of the valve seat surface 29 and the inner wall 38 the bulge 36 with respect to the surface of the spherical valve closing body 37 as low as possible held.

Die Figuren 2 bis 4 zeigen in Teildarstellungen Verfahrensschritte zur Erzielung der Ausbuchtung 36 bzw. des Sammelraums 37 gemäß dem ersten Ausführungsbeispiel nach Figur 1. Für gleiche und gleichwirkende Teile finden die gleichen Bezugszeichen Verwendung, wie sie in Figur 1 verwendet wurden. Im noch nicht in das Ventilgehäuse 1 montierten Zustand des Ventilsitzkörpers 16 wird zunächst die zumindest in ihrem Bodenteil 20 vollständig ebene Spritzlochscheibe 21 mit ihrer oberen Stirnseite 19 an die Stirnseite 17 des Ventilsitzkörpers 16 angelegt. Die sich konisch in Strömungsrichtung in Form eines Kegelmantels verjüngende Ventilsitzfläche 29 endet unmittelbar an der oberen Stirnseite 19 der Spritzlochscheibe 21 und umschließt dabei den zentralen Bereich 24 der Spritzlochscheibe, von dem aus auch die Abspritzöffnungen 25 ausgehen. Die Spritzlochscheibe 21 ist mittels der umlaufenden Schweißnaht 31 außerhalb des zentralen Bereiches 24 dicht mit der Stirnseite 17 des Ventilsitzkörpers 16 verbunden. Würde nun ein beispielsweise als Kugel ausgebildeter Ventilschließkörper 7, wie er gestrichelt in Figur 2 dargestellt ist, in den Ventilsitzkörper 16 eingeführt, so würde er an der oberen Stirnseite 19 der Spritzlochscheibe 21 anstoßen und nicht mit der Ventilsitzfläche 29 in Berührung kommen, da der Durchmesser des kugelförmigen Ventilschließkörpers 7 und die Neigung der Ventilsitzfläche 29 so ausgelegt sind, daß der Ventilschließkörper 7 bei Anlage an der Ventilsitzfläche 29 über die Stirnseite 17 des Ventilsitzkörpers 16 herausragt. In einem weiteren, in Figur 3 gezeigten Verfahrensschritt wird nun anstelle des Ventilschließkörpers 7 ein Formkörper 40 in den Ventilsitzkörper 16 eingeführt und zur Anlage an der oberen Stirnseite 19 der Spritzlochscheibe 21 gebracht. Der Formkörper 40 hat beispielsweise die gleiche Kontur wie der Ventilschließkörper 7, also beim Ausführungsbeispiel die Kontur einer Kugel, jedoch hat er einen kleineren Querschnitt als der Ventilschließkörper 7. Danach wird der Formkörper mittels einer in Richtung zur Spritzlochscheibe 21 hin am Formkörper 40 angreifenden Kraft 41 so lange auf die Spritzlochscheibe 21 hin bewegt, bis an der Spritzlochscheibe 21 in ihrem zentralen Bereich 24 durch plastische Verformung die Ausbuchtung 36 mit der Kontur des Formkörpers 40 gebildet ist und die innere Wandung 38 der Ausbuchtung 36 unmittelbar in die Wandung der Ventilsitzfläche 29 übergeht. Dabei kann beispielsweise der Radius des kugelförmigen Formkörpers 40 so gewählt sein, daß nach Fertigstellung der Ausbuchtung 36 die einen Kegelmantel darstellende Ventilsitzfläche 29 tangential in die angrenzende innere Wandung 38 der Ausbuchtung 36 übergeht. Um die plastische Verformung des zentralen Bereiches 24 durch den Formkörper 40 zu erleichtern, kann die Spritzlochscheibe 21 im zentralen Bereich 24 während der Verformung erwärmt werden. Nach Beendigung der Verformung wird der Formkörper 40 wieder aus dem Ventilsitzkörper 16 entfernt. Die zunächst parallele Wandungen aufweisenden Abspritzöffnungen 25 (siehe Figur 2) verformen sich bei der Bildung der Ausbuchtung 36 derart, daß sie in Strömungsrichtung eine sich konisch erweiternde Gestalt annehmen. Derart sich in Strömungsrichtung erweiternde Abspritzöffnungen bringen jedoch den Vorteil mit sich, daß sie zu stabilen Durchströmungen und einer guten Brennstoffaufbereitung führen. Der Verlauf der Ventilsitzfläche 29 und der Querschnitt des Formkörpers 40 kann auch so gewählt werden, daß nicht nur die Spritzlochscheibe 21 in ihrem zentralen Bereich 24 bei der Erzeugung der Ausbuchtung 36 plastisch verformt wird, sondern auch ein Randbereich des Ventilsitzkörpers 16 in der Nähe der Stirnseite 17, wodurch ebenfalls ein unmittelbarer absatzloser Übergang zwischen der Ventilsitzfläche und der inneren Wandung 38 der Ausbuchtung erzeugt wird. Abschließend wird nach dem Entfernen des Formkörpers 40 der Ventilsitzkörper in die Längsöffnung 3 des Ventilgehäuses 1 eingeführt und mittels der Schweißnaht 30 in der oben beschriebenen Weise darin befestigt. Figur 4 zeigt einen Ventilsitzkörper 16 mit daran befestigter Spritzlochscheibe 21, die eine erfindungsgemäß erzeugte Ausbuchtung 36 hat, in die der an der Ventilsitzfläche 29 anliegende Ventilschließkörper 7 über die Stirnseite 17 hinausragend sich erstreckt, wodurch ein Sammelraum 37 mit möglichst geringem Volumen erzielt wird.Figures 2 to 4 show in partial representations Process steps to achieve the bulge 36 and the Collecting space 37 according to the first embodiment Figure 1. For the same and equivalent parts find the same reference numerals as used in Figure 1 were used. Not yet in the valve housing 1 assembled state of the valve seat body 16 is initially which is completely flat, at least in its base part 20 Spray plate 21 with its upper end face 19 to the End face 17 of the valve seat body 16 created. Which conical in the direction of flow in the form of a conical jacket tapered valve seat surface 29 ends directly at the upper end face 19 of the spray plate 21 and encloses the central region 24 of the spray orifice plate, from from which the spray openings 25 also emanate. The Spray plate 21 is by means of the circumferential weld seam 31 outside the central area 24 close to the End face 17 of the valve seat body 16 connected. Would now a ball, for example Valve closing body 7, as dashed in Figure 2 is inserted into the valve seat body 16, so he would on the upper face 19 of the spray orifice plate 21 but not with the valve seat surface 29 in Come into contact because of the diameter of the spherical Valve closing body 7 and the inclination of the valve seat surface 29 are designed so that the valve closing body 7 at System on the valve seat surface 29 on the end face 17 of the Valve seat body 16 protrudes. In another, in figure 3 method step is now instead of Valve closing body 7 a molded body 40 in the Valve seat body 16 inserted and to abut the upper Bring end face 19 of the spray orifice plate 21. Of the Shaped body 40 has, for example, the same contour as that Valve closing body 7, that is in the embodiment Contour of a sphere, but it has a smaller one Cross section than the valve closing body 7. Then the Shaped body by means of in the direction of the spray orifice plate 21 acting on the molded body 40 force 41 so long the spray plate 21 moves until the Spray plate 21 in its central area 24 through plastic deformation the bulge 36 with the contour of the Shaped body 40 is formed and the inner wall 38 of the Bulge 36 directly into the wall of the Valve seat surface 29 merges. For example, the Radius of the spherical shaped body 40 may be chosen so that after completion of the bulge 36 a cone representing valve seat surface 29 tangentially into the adjacent inner wall 38 of the bulge 36 merges. The plastic deformation of the central area 24 by the molded body 40, the Spray plate 21 in the central area 24 during Deformation warmed. After the deformation has ended the molded body 40 becomes again from the valve seat body 16 away. The one initially showing parallel walls Spray openings 25 (see Figure 2) deform at the Formation of the bulge 36 such that it in Flow direction a flared shape accept. So expanding in the direction of flow Spray openings, however, have the advantage that them to stable flows and a good one Perform fuel processing. The course of the Valve seat surface 29 and the cross section of the molded body 40 can also be chosen so that not only the Spray plate 21 in its central region 24 in the Generation of the bulge 36 is plastically deformed, but also an edge region of the valve seat body 16 in the Near the end face 17, which also gives an immediate seamless transition between the valve seat and the inner wall 38 of the bulge is generated. Finally, after removing the molded body 40, the Valve seat body in the longitudinal opening 3 of the valve housing 1 introduced and by means of the weld 30 in the above described way attached therein. Figure 4 shows one Valve seat body 16 with an orifice plate attached to it 21, which has a bulge 36 produced according to the invention, in that of the adjacent valve seat surface 29 Valve closing body 7 projecting beyond the end face 17 extends, whereby a collecting space 37 with as much as possible low volume is achieved.

Bei dem in den Figuren 5 bis 7 dargestellten zweiten Ausführungsbeispiel des erfindungsgemäßen Verfahrens zur Herstellung einer Spritzlochscheibe 21 mit einer Ausbuchtung 36 sind die gegenüber den bisherigen Figuren gleichbleibenden und gleichwirkenden Teile durch die gleichen Bezugszeichen gekennzeichnet. Beim zweiten Ausführungsbeispiel hat der Ventilschließkörper 7' nicht eine Kugelform, sondern eine Kegelform, die in Figur 5 gestrichelt dargestellt ist. In Figur 5 ist zunächst gezeigt, wie die ebene Spritzlochscheibe 21 an der Stirnseite 17 des Ventilsitzkörpers 16 mittels der Schweißnaht 31 fixiert ist. In Figur 6 ist anstelle des Ventilschließkörpers 7' ein kegelförmiger Formkörper 40' in den Ventilsitzkörper 16 eingeführt und auf die obere Stirnseite 19 der Spritzlochscheibe 21 aufgesetzt. Der Formkörper 40' hat dabei etwa den Querschnitt des zentralen Bereiches 24 oder ist gering größer. Die kegelförmige Kontur des Formkörpers 40' wird nun bei Einwirkung der Kraft 41 auf den Formkörper nach unten bewegt und verformt dabei plastisch die Spritzlochscheibe 21 in ihrem zentralen Bereich 24, so daß sich eine kegelförmige Ausbuchtung 36 ergibt, deren innere Wandung 38 unmittelbar in die Ventilsitzfläche 29 übergeht. Danach wird der Formkörper 40' aus dem Ventilsitzkörper 16 entfernt und der Ventilsitzkörper 16 in der oben beschriebenen Weise am Ventilgehäuse 1 fixiert. Die Figur 7 zeigt den kegelförmigen Ventilschließkörper 7' bei Anlage an der Ventilsitzfläche 29, wobei die Spitze über die Stirnseite 17 des Ventilsitzkörpers 16 hinaus in die kegelförmige Ausbuchtung 36 ragt, wodurch sich ein möglichst geringes Volumen des Sammelraums 37 ergibt.In the second shown in Figures 5 to 7 Embodiment of the inventive method for Production of a spray perforated disk 21 with a bulge 36 are compared to the previous figures constant and equivalent parts through the marked with the same reference numerals. At the second time The valve closing body 7 'does not have an exemplary embodiment a spherical shape, but a conical shape, which is shown in FIG is shown in dashed lines. In Figure 5 is first shown how the flat spray plate 21 on the End face 17 of the valve seat body 16 by means of the Weld 31 is fixed. In Figure 6 is instead of Valve closing body 7 'a conical shaped body 40' in the valve seat body 16 inserted and on the upper Face 19 of the spray plate 21 placed. Of the Shaped body 40 'has approximately the cross section of the central one Area 24 or is slightly larger. The conical contour of the shaped body 40 'is now exposed to the force 41 moves the molded body downward and deforms it plastically the spray plate 21 in its central Area 24 so that there is a conical bulge 36 results, the inner wall 38 directly into the Valve seat surface 29 merges. Then the molded body 40 ' removed from the valve seat body 16 and the Valve seat body 16 in the manner described above on Valve housing 1 fixed. Figure 7 shows the conical Valve closing body 7 'when in contact with the valve seat surface 29, the tip over the end face 17 of the Valve seat body 16 into the conical bulge 36 protrudes, resulting in the smallest possible volume of the Collection room 37 results.

Claims (4)

  1. Method for the production of a valve, especially a fuel injection valve for fuel injection systems of internal combustion engines, with a valve housing (1), with a movable valve-closing element (7, 7') which interacts with a valve seat surface (29) formed in a valve seat body (16), with a perforated spray disc (21) which is arranged downstream of the valve seat surface (29), on one end (17) of the valve seat body (7, 7'), and, in a central area (24), in a direction away from the valve seat body (7, 7'), has a bulge (36) into which the valve-closing element (7, 7') projects and in which at least one spray opening (25) is provided, characterized in that the perforated spray disc (21), which is flat at least in its central area (24), is first of all laid against that end (17) of the valve seat body (16) which lies downstream of the valve seat surface (29) and as far as which the valve seat surface (29) extends, the perforated spray disc (21) is then fixed on the end (17) of the valve seat body (16) outside the central area (24), a shaped body (40, 40') which has the same profile as, but a smaller cross section than, the valve-closing element (7, 7') is then introduced into the valve seat body (16) and placed on the central area (24) of the perforated spray disc (21), the shaped body (40, 40') is then moved towards the perforated spray disc (21), by means of a force (41) acting on the shaped body (40, 40') in the direction of the perforated spray disc (21), until the bulge (36) with the profile of the shaped body (40, 40') is formed on the perforated spray disc (21) in its central area (24) by plastic deformation and the wall (38) of the bulge (36) facing the shaped body (40, 40') merges directly into the wall of the valve seat surface (29), after which the shaped body (40, 40') is removed from the valve seat body (16) and, finally, the valve seat body (16) is introduced into the valve housing (1) and fixed therein.
  2. Method according to Claim 1, characterized in that the shaped body (40) has a round profile on the side facing the perforated spray disc (21).
  3. Method according to Claim 2, characterized in that the shaped body (40) has, at least in part, the profile of a ball.
  4. Method according to Claim 1, characterized in that the shaped body (40') at least partially has the profile of a cone on the side facing the perforated spray disc (21).
EP95114688A 1994-12-20 1995-09-19 Method for manufacturing a valve Expired - Lifetime EP0718491B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4445358A DE4445358A1 (en) 1994-12-20 1994-12-20 Valve and method of making a valve
DE4445358 1994-12-20

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EP0718491A1 EP0718491A1 (en) 1996-06-26
EP0718491B1 true EP0718491B1 (en) 1998-12-23

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US (1) US5746376A (en)
EP (1) EP0718491B1 (en)
JP (1) JPH08254170A (en)
KR (1) KR960021161A (en)
BR (1) BR9505960A (en)
DE (2) DE4445358A1 (en)

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DE102016219782A1 (en) * 2016-10-12 2018-04-12 Ford Global Technologies, Llc Variable adjustable poppet valve
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JPH08254170A (en) 1996-10-01
DE4445358A1 (en) 1996-06-27
US5746376A (en) 1998-05-05
EP0718491A1 (en) 1996-06-26
BR9505960A (en) 1997-12-23
DE59504628D1 (en) 1999-02-04
KR960021161A (en) 1996-07-18

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