EP0497931B1 - Fuel-injection valve and process for its manufacture - Google Patents

Fuel-injection valve and process for its manufacture Download PDF

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Publication number
EP0497931B1
EP0497931B1 EP19910912689 EP91912689A EP0497931B1 EP 0497931 B1 EP0497931 B1 EP 0497931B1 EP 19910912689 EP19910912689 EP 19910912689 EP 91912689 A EP91912689 A EP 91912689A EP 0497931 B1 EP0497931 B1 EP 0497931B1
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EP
European Patent Office
Prior art keywords
valve
body
seat
injection
welding seam
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP19910912689
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German (de)
French (fr)
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EP0497931A1 (en
Inventor
Dieter Vogt
Ferdinand Reiter
Martin Maier
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE4026721 priority Critical
Priority to DE19904026721 priority patent/DE4026721A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE1991/000589 priority patent/WO1992003653A1/en
Publication of EP0497931A1 publication Critical patent/EP0497931A1/en
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Publication of EP0497931B1 publication Critical patent/EP0497931B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/161Means for adjusting injection-valve lift
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853Orifice plates
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49405Valve or choke making
    • Y10T29/49412Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49416Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
    • Y10T29/49421Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metallurgical bonding
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49405Valve or choke making
    • Y10T29/49412Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49425Valve or choke making with assembly, disassembly or composite article making including metallurgical bonding
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49764Method of mechanical manufacture with testing or indicating
    • Y10T29/49771Quantitative measuring or gauging

Abstract

In prior art fuel-injection valves, the valve-needle stroke can be adjusted for example by grinding down one end of the valve-nozzle body or by varying the penetration depth of the valve-seat body inserted in a longitudinal aperture in the valve-seat support and subsequently rigidly secured to the valve-seat support. This method of adjustment is not possible with assembled valves however. If the valve-seat body is pressed into the longitudinal aperture, there is a danger of clip formation. In the new fuel-injection valve, a valve assembly comprising the valve-seat body (18) and the perforated body (22) joined to it is inserted in the longitudinal aperture (3) in the valve-seat support (1) and rigidly secured to it, the depth of insertion determining the initial setting of the valve-needle stroke. Exact adjustment of the needle stroke can be done with the assembled valve by bending the part of the valve located between the points of attachment (24, 30) of the perforated body (22) to the valve-seat support. The fuel-injection valve proposed and the method for its manufacture are particularly suitable for use in fuel-injection systems in mixture compressing spark ignition engines.

Description

    Stand der Technik. State of the art.
  • Die Erfindung geht aus von einem Einspritzventil und einem Verfahren zur Herstellung eines Einspritzventils nach dem Oberbegriff des Anspruches 1 bzw. 7. Aus der DE 37 10 467 A1 ist bereits ein Einspritzventil bekannt, das stromabwärts seiner Ventilsitzfläche einen topfförmigen Lochkörper aufweist. The invention relates to an injection valve and a method of manufacturing an injector according to the preamble of claim 1 and 7. From the DE 37 10 467 A1 a fuel injector is already known, having a pot-shaped perforated body downstream of its valve seat. Der Lochkörper ist zwischen dem Düsenkörper und einer Aufbereitungshülse fest eingespannt. The perforated body is fixedly clamped between the nozzle body and a preparation sleeve. Zur Einstellung des Hubes der Ventilnadel und damit der statischen, während des stationären Öffnungszustandes des Einspritzventils abgegebenen Strömungsmenge eines Mediums wird die Stirnfläche des Düsenkörpers, an der die den Restluftspalt des Ankers gegenüber dem Kern bestimmende Anschlagplatte anliegt, abgeschliffen. To adjust the stroke of the valve needle and thus the static discharged during the stationary opening state of the injector flow rate of a medium is the face of the nozzle body on which the abutting the residual air gap of the armature opposite the core defining stop plate, abraded. Dieses Ventil und das angewendete Herstellungsverfahren haben jedoch den Nachteil, daß die Stirnfläche des Düsenkörpers nur bei einem teilweise demontierten Ventil abgeschliffen werden kann, so daß die exakte Einstellung des Ventilnadelhubes sehr aufwendig ist. However, this valve and the applied manufacturing processes have the disadvantage that the end face of the nozzle body may be ground only in a partially disassembled valve, so that the accurate adjustment of the valve needle stroke is very expensive.
  • Die DE 38 41 142 A1 zeigt ein Einspritzventil mit einem topfförmigen Lochkörper der sich mit seinem Halterand in axialer Richtung der Ventilsitzfläche abgewandt erstreckt und mit dem Ende des Halterandes mit der Wandung der Aufnahmebohrung des Ventilsitzkörpers verbunden ist. The DE 38 41 142 A1 shows an injection valve with a pot-shaped perforated body which is extended turned away with its holding edge in the axial direction of the valve seat and connected to the end of the holding edge, with the wall of the receiving bore of the valve seat body. Der Ventilsitzkörper ist in die Längsöffnung des Sitzträgers eingeschoben und mit diesem fest verbunden, wobei die Einschubtiefe des Ventilsitzkörpers in die Längsöffnung des Sitzträgers den Ventilnadelhub bestimmt. The valve seat body is inserted into the longitudinal opening of the seat support and firmly connected thereto, wherein the insertion depth of the valve seat body is determined in the longitudinal opening of the seat carrier to the valve needle. Auch bei diesem Ventil kann im fertig montierten Zustand keine Einstellung des Ventilnadelhubes mehr vorgenommen werden, ohne das Ventil zumindest teilweise wieder zu demontieren. Also with this valve in the fully assembled state, no adjustment of the valve needle stroke more can be made without at least partially disassembling the valve.
  • Ein Einspritzventil mit einem Ventilsitzkörper, der wenigstens eine Abspritzöffnung aufweist, ist in der DE 38 31 196 A1 beschrieben. An injection valve having a valve seat body having at least one spray opening, is described in DE 38 31 196 A1. Der Ventilsitzkörper wird in die Längsöffnung des Sitzträgers eingepreßt, wobei die Einpreßtiefe den Ventilnadelhub bestimmt. The valve seat body is pressed into the longitudinal opening of the seat support, wherein the press-in depth determines the valve needle lift. Die Einstellung des Ventilnadelhubes kann zwar an dem fertig montierten Einspritzventil vorgenommen werden, bei dem Einpressen des Ventilsitzkörpers in den Sitzträger besteht jedoch die Gefahr der Spanbildung an dem Ventilsitzkörper und/oder dem Sitzträger. Although the setting of the valve needle stroke may be made to the fully assembled injector, however, consists in the pressing of the valve seat body in the seat support, the risk of chipping of the valve seat body and / or the seat support.
  • Vorteile der Erfindung Advantages of the Invention
  • Das erfindungsgemäße Einspritzventil mit den kennzeichnenden Merkmalen des Anspruches 1 bzw. das Verfahren zur Herstellung eines Einspritzventils mit den kennzeichnenden Merkmalen des Anspruches 7 haben durch das Verformen des aus Ventilsitzkörper und Lochkörper bestehenden Ventilsitzteiles in axialer Richtung im Bereich zwischen den Befestigungsstellen des Lochkörpers den Vorteil einer besonders einfachen und kostengünstigen, voll automatisierbaren und exakten Einstellung des Ventilnadelhubes und damit der statischen, während des stationären Öffnungszustandes des Einspritzventils abgegebenen Strömungsmenge eines Mediums. The injection valve according to the invention with the characterizing features of claim 1 and the method for manufacturing an injection valve having the characterizing features of claim 7 are by deformation of the group consisting of valve seat body and the perforated body valve seat member in the axial direction in the region between the attachment points of the perforated body the advantage of particularly simple and inexpensive, fully automated and precise adjustment of the valve needle stroke, and thus the static, discharged during the stationary opening state of the injector flow rate of a medium. Zudem ergibt sich eine einfache Konstruktion des Einspritzventils mit einer einfachen und kostengünstigen Herstellung des Ventilsitzkörpers und des Lochkörpers. In addition, a simple construction of the injection valve with a simple and cost-effective production of the valve seat body and the perforated body produces. Es ist gewährleistet, daß die axiale Erstreckung des Lochkörpers im Bereich der Löcher durch die Montage des Einspritzventils nicht verändert und die gewünschte, vorgegebene Abspritzcharakteristik erzielt wird. It is ensured that the axial extension of the perforated body in the region of the holes through the mounting of the injector does not change, and the desired, predetermined spraying characteristic is achieved.
  • Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Ventils und des im Anspruch 7 angegebenen Verfahrens möglich. By the provisions recited in the dependent claims permit advantageous developments and improvements of the features indicated in claim 1 and of the valve indicated in claim 7 method are possible.
  • Es ist vorteilhaft, wenn sich ein Halterand des topfförmigen Lochkörpers in axialer Richtung dem Ventilsitzkörper abgewandt erstreckt und der Halterand an seinem freien Ende mit der Wandung der Längsöffnung des Sitzträgers fest verbunden ist. It is advantageous when a retaining edge of the pot-shaped perforated body extends away in the axial direction of the valve seat body and the holding edge is fixedly connected at its free end with the wall of the longitudinal orifice of the seat carrier. So ist zum einen ein fester und sicherer Halt des aus Ventilsitzkörper und Lochkörper bestehenden Ventilteiles in der Längsöffnung des Sitzträgers gewährleistet, zum anderen kann der Lochkörper zur exakten Einstellung des Ventilnadelhubes in axialer Richtung auf einfache Art und Weise im Bereich zwischen seinen Befestigungsstellen verformt werden. On the one hand, a fixed and secure retention of the group consisting of valve seat body and the perforated body valve member is ensured in the longitudinal opening of the seat carrier, on the other hand the perforated body for the exact setting of the valve needle stroke in the axial direction in a simple way can be deformed in the region between its fastening points.
  • Besonders vorteilhaft ist es, wenn der Halterand des Lochkörpers zu seinem freien Ende hin nach außen gebogen ist, wodurch er an seinem Ende einen größeren Durchmesser aufweist als den Durchmesser der Längsöffnung des Sitzträgers, so daß der Halterand beim Einschieben des Ventilteils in die Längsöffnung des Sitzträgers eine radiale Federwirkung hat und mit einer leichten Pressung an der Wandung der Längsöffnung anliegt, ohne daß die Gefahr einer Spanbildung an dem Lochkörper und/oder der Längsöffnung des Sitzträgers besteht. It is particularly advantageous if the holding edge of the perforated body is bent toward its free end to the outside, thereby having a larger diameter at its end than the diameter of the longitudinal orifice of the seat carrier, is so that the retaining edge during the insertion of the valve member into the longitudinal opening of the seat carrier has a radial spring action and rests with a slight pressure on the wall of the longitudinal opening without the danger of chipping on the hole body and / or the longitudinal opening of the seat carrier is composed.
  • Dabei ist es von Vorteil, wenn der Umfang des Ventilsitzkörpers einen kleineren Durchmesser aufweist als den Durchmesser der Längsöffnung des Sitzträgers. It is of advantage if the circumference of the valve seat body has a smaller diameter than the diameter of the longitudinal orifice of the seat carrier. Dadurch wird vermieden, daß beim Einschieben des aus Ventilsitzkörper und Lochkörper bestehenden Ventilsitzteiles in den Sitzträger Späne an dem Ventilsitzkörper und/oder der Längsöffnung des Sitzträgers entstehen. This avoids that arise during insertion of the group consisting of valve seat body and the perforated body valve seat part in the seat support chips on the valve seat body and / or the longitudinal opening of the seat support. Außerdem ist bei der Herstellung nicht die Einhaltung einer engen Maßtoleranz an dem Umfang des Ventilsitzkörpers erforderlich, so daß die Herstellkosten des Ventilsitzkörpers wesentlich reduziert werden. In addition, non compliance with a close dimensional tolerance at the periphery of the valve seat body is required in the production, so that the production cost of the valve seat body are substantially reduced.
  • Um zu verhindern, daß das Medium zwischen dem Umfang des Ventilsitzkörpers und der Längsöffnung des Sitzträgers zu der wenigstens einen Abspritzöffnung und/oder zwischen dem Halterand des Lochkörpers und der Längsöffnung des Sitzträgers zu einer Ansaugleitung der Brennkraftmaschine strömen kann, ist es vorteilhaft, wenn der Lochkörper an seiner Stirnseite mit der Stirnseite des Ventilsitzkörpers mittels einer ersten umlaufenden Schweißnaht und an seinem Umfang mit der Wandung der Längsöffnung des Sitzträgers mittels einer zweiten umlaufenden Schweißnaht dicht verbunden ist. In order to prevent the medium between the periphery of the valve seat body and the longitudinal opening of the seat support to the can flow one spray orifice and / or between the holding edge of the perforated body and the longitudinal opening of the seat base to an intake of the engine at least, it is advantageous if the perforated body is tightly connected at its end face with the end face of the valve seat body by means of a first circumferential weld seam and at its periphery to the wall of the longitudinal orifice of the seat carrier by means of a second circumferential weld.
  • Besonders vorteilhaft ist es hierbei, wenn die erste Schweißnaht und die zweite Schweißnaht mittels Laserschweißen besonders sicher und zuverlässig und auf einfache Art und Weise ausgebildet werden. It is particularly advantageous here if the first weld and the second weld seam are formed by laser welding particularly safe and reliable and easy manner. Zudem erfolgt dabei nur eine geringe Erwärmung der miteinander zu verschweißenden Teile. In addition, while only a slight warming of the parts are to be welded together.
  • Zeichnung drawing
  • Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Die Figur zeigt ein teilweise dargestelltes Einspritzventil gemäß des Ausführungsbeispiels. The figure shows a partially illustrated injection valve according to the embodiment.
  • Beschreibung description
  • In der Figur ist beispielsweise ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. In the figure, a fuel injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines, for example, shown in part. Das Brennstoffeinspritzventil hat einen rohrförmigen Sitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsöffnung 3 ausgebildet ist. The fuel injection valve has a tubular seat carrier 1, in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis. 2 In der Längsöffnung 3 ist eine z. In longitudinal opening 3 is a z. B. rohrförmige Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende 6 mit einem kugelförmigen Ventilschließkörper 7 verbunden ist. B. a tubular valve needle 5 is arranged, which is connected at its downstream end 6 with a spherical valve closing body. 7 Die Betätigung des Brennstoffeinspritzventils erfolgt in bekannter Weise beispielsweise elektromagnetisch. The actuation of the fuel injection valve is for example electromagnetically, in known manner. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen bzw. Schließen des Brennstoffeinspritzventils 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 verbunden und auf den Kern 12 ausgerichtet. an indicated electromagnetic circuit is used for axial movement of the valve needle 5 and thus for opening or closing the fuel injection valve having a magnet coil 10, an armature 11 and a core 12. The armature 11 is connected to the valve closure member 7 facing away from the end of the valve needle 5 and aligned with the core 12th
  • Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 16 eines Ventilsitzkörpers 18. Der Umfang des Ventilsitzkörpers 18 weist einen kleineren Durchmesser als den Durchmesser der Längsöffnung 3 des Sitzträgers 1 auf. a guide hole serves to guide the valve closure member 7 during the axial movement 16 of a valve seat body 18. The periphery of the valve seat body 18 has a smaller diameter than the diameter of the longitudinal opening 3 of the seat support. 1 An seiner einen, dem Ventilschließkörper 7 abgewandten Stirnseite 19 ist der Ventilsitzkörper 18 mit einem Bodenteil 21 eines Lochkörpers 22 konzentrisch und fest verbunden, so daß das Bodenteil 21 mit seiner Stirnseite 20 an der Stirnseite 19 des Ventilsitzkörpers 18 anliegt. At its one, the valve closing body 7 facing away from end face 19 of the valve seat body is concentrically and fixedly connected 18 with a bottom part 21 of a perforated body 22, so that the bottom part 21 bears with its end face 20 at the end face 19 of valve seat body 18th Die Verbindung von Ventilsitzkörper 18 und Lochkörper 22 erfolgt beispielsweise durch eine umlaufende und dichte, zB mittels eines Lasers ausgebildete erste Schweißnaht 24. Bei der Werkstoffauswahl für den Lochkörper 22 ist aus diesem Grund auch auf eine gute Schweißbarkeit zu achten. The combination of valve seat body 18 and hole body 22 is effected for example by a continuous and dense, for example, formed by a laser first weld 24. In selecting materials for the hole body 22 is for this reason also to ensure good weldability. Durch diese Art der Montage ist die Gefahr einer Verformung des Bodenteils 21 im Bereich seiner wenigstens einen, beispielsweise zwei durch Erodieren ausgeformten Abspritzöffnungen 27 vermieden. With this type of assembly, the risk of deformation of the bottom part 21 in the region of at least one, for example two molded by eroding injection openings 27 is avoided.
  • Der Lochkörper 22 weist eine topfförmige Querschnittsform auf. The perforated body 22 has a cup-shaped cross-sectional shape. An das Bodenteil 21 des Lochkörpers 22 schließt sich ein umlaufender Halterand 23 an, der sich in axialer Richtung dem Ventilsitzkörper 18 abgewandt erstreckt und bis zu einem Ende 26 hin konisch nach außen gebogen ist. At the bottom part 21 of the perforated body 22 is a circumferential retaining edge 23 connects, which extends in the axial direction facing away from the valve seat body 18 and to an end 26 is conically bent outwardly. Dabei weist der Halterand 23 an seinem Ende 26 einen größeren Durchmesser auf als den Durchmesser der Längsöffnung 3 des Sitzträgers 1. In this case, the retainer edge 23 has at its end 26 has a larger diameter than the diameter of the longitudinal opening 3 of the seat support. 1
  • Bei in die Längsöffnung 3 des Sitzträgers 1 eingeschobener Ventilnadel 5 wird in die Längsöffnung 3 das aus Ventilsitzkörper 18 und Lochkörper 22 bestehende Ventilsitzteil eingeschoben. When in the longitudinal opening 3 of the seat carrier 1 an inserted valve needle 5 in the longitudinal opening 3 of the valve seat body 18 and hole body 22 existing valve seat member is inserted. Durch den im Vergleich zu der Längsöffnung 3 des Sitzträgers 1 geringeren Durchmesser des Umfanges des Ventilsitzkörpers 18 liegt nur zwischen der Längsöffnung 3 und dem leicht konisch nach außen gebogen ausgebildeten Halterand 23 des Lochkörpers 22 eine radiale Pressung vor, wobei der Halterand 23 eine radiale Federwirkung auf die Wandung der Längsöffnung 3 ausübt. Due to the reduced compared to the longitudinal opening 3 of the seat base 1 diameter of the circumference of the valve seat body 18 with the retaining edge 23, a radial spring action is only between the longitudinal opening 3 and the support rim 23 slightly conical bent outwardly formed of the perforated body 22, a radial compression prior to exerts the wall of the longitudinal opening. 3 Dadurch wird beim Einschieben des aus Ventilsitzkörper 18 und Lochkörper 22 bestehenden Ventilsitzteiles in die Längsöffnung 3 des Sitzträgers 1 eine Spanbildung sowohl an dem Ventilsitzteil als auch an der Längsöffnung 3 vermieden. Characterized a chip formation is prevented both at the valve seat portion as well as to the longitudinal opening 3 during insertion of the of the valve seat body 18 and hole body 22 existing valve seat member into the longitudinal opening 3 of the seat support. 1 Zudem ist bei der Herstellung des Ventilsitzkörpers 18 nicht die Einhaltung einer engen Maßtoleranz an seinem Umfang erforderlich, da der Ventilsitzkörper 18 in radialer Richtung ein kleines Spiel in der Längsöffnung 3 des Sitzträgers 1 hat, so daß die Herstellkosten gegenüber einem in die Längsöffnung 3 eingepreßten Ventilsitzkörper wesentlich reduziert werden. In addition, in the manufacture of valve seat body 18, the maintenance of a tight dimensional tolerance on its periphery is not necessary, because the valve seat body 18 in the radial direction has a small clearance in longitudinal opening 3 of the seat carrier 1, so that the manufacturing cost compared with a pressed-in into the longitudinal opening 3 Valve seat body be substantially reduced. Die Einschubtiefe des Ventilsitzteils in die Längsöffnung 3 des Sitzträgers 1 bestimmt die Voreinstellung des Hubes der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an einer Ventilsitzfläche 32 des Ventilsitzkörpers 18 festgelegt ist. The insertion depth of the valve seat part in the longitudinal opening 3 of the seat carrier 1 determines the presetting of the stroke of the valve needle 5, since the one end position of valve needle 5 is fixed in non-energized magnetic coil 10 by the contact of valve-closure member 7 to a valve seat surface 32 of valve seat body 18th Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 am Kern 12 festgelegt. The other end position of valve needle 5 is fixed, for example by the abutment of the armature 11 on the core 12 when energized magnetic coil 10 degrees. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt den Hub dar. The path between these two end positions of valve needle 5 represents the lift.
  • An seinem Ende 26, das an der Längsöffnung 3 des Sitzträgers 1 anliegt, ist der Halterand 23 des Lochkörpers 22 mit der Wandung der Längsöffnung 3 beispielsweise durch eine umlaufende und dichte zweite Schweißnaht 30 verbunden. At its end 26, which abuts the longitudinal opening 3 of the seat base 1, the retainer edge 23 of the perforated body 22 with the wall of the longitudinal opening 3 is connected, for example, by a circumferential weld and tight second thirtieth Die zweite Schweißnaht 30 ist genau wie die erste Schweißnaht 24 z. The second weld seam 30 is just like the first weld 24 z. B. mittels eines Lasers ausgebildet, so daß sich eine sichere und zuverlässige, auf einfache Art und Weise herstellbare Verschweißung ergibt, bei der die Erwärmung der miteinander zu verschweißenden Teile gering ist. formed for example by means of a laser, so that a safe and reliable, can be produced in a simple fashion welding results, in which the heating of the parts to be welded together is small.
  • Eine dichte Verschweißung von Ventilsitzkörper 18 und Lochkörper 22 sowie von Lochkörper 22 und Sitzträger 1 ist erforderlich, damit das verwendete Medium, beispielsweise ein Brennstoff, nicht zwischen der Längsöffnung 3 des Sitzträgers 1 und dem Umfang des Ventilsitzkörpers 18 hindurch zu den Abspritzöffnungen 27 oder zwischen der Längsöffnung 3 des Sitzträgers 1 und dem Halterand 23 des Lochkörpers 22 hindurch unmittelbar in eine Ansaugleitung der Brennkraftmaschine strömen kann. A tight welding of the valve seat body 18 and hole body 22, as well as perforated body 22 and the seat support 1 is required so that the medium used, for example a fuel, not between the longitudinal opening 3 of the seat carrier 1 and the periphery of the valve seat body 18 through the discharge orifices 27 or between the longitudinal opening 3 of the seat carrier 1 and the retaining edge 23 of the perforated body 22 therethrough can flow directly into an intake passage of the internal combustion engine.
  • Somit liegen am Lochkörper 22 zwei Befestigungsstellen vor, die eine Befestigungsstelle ist die erste Schweißnaht 24 mit dem Ventilsitzkörper 18 und die zweite Befestigungsstelle die zweite Schweißnaht 30 mit dem Sitzträger 1. Thus, lying on the perforated body 22 before two fastening points, which is an attachment point, the first weld bead 24 with the valve seat body 18 and the second attachment point, the second weld seam 30 to the seat carrier. 1
  • Der kugelförmige Ventilschließkörper 7 wirkt mit der sich in Strömungsrichtung kegelförmig verjüngenden Ventilsitzfläche 32 des Ventilsitzkörpers 18 zusammen, die in axialer Richtung zwischen der Führungsöffnung 16 und der Stirnseite 19 des Ventilsitzkörpers 18 ausgebildet ist. The spherical valve closing body 7 cooperates with the conically tapering in the flow direction of valve seat surface 32 of valve seat body 18 which is formed in the axial direction between the guide hole 16 and the end face 19 of valve seat body 18th Die Führungsöffnung 16 weist, wie links der Ventillängsachse 2 in der Figur dargestellt, wenigstens einen Strömungsdurchlaß 33 auf, der eine Strömung des Mediums von dem in radialer Richtung durch die Längsöffnung 3 des Sitzträgers 1 begrenzten Ventilinnenraum 35 zu einer in Strömungsrichtung zwischen der Führungsöffnung 16 und der Ventilsitzfläche 32 des Ventilsitzkörpers 18 ausgebildeten Ringnut 36 ermöglicht, die im geöffneten Zustand des Ventils mit den Abspritzöffnungen 27 der Lochplatte 22 in Verbindung steht. The guide hole 16 has, as the left the valve longitudinal axis 2 is shown in the figure, at least one flow passage 33, the flow of the medium from the restricted in the radial direction through the longitudinal opening 3 of the seat carrier 1 valve interior 35 to a direction of flow between the guide opening 16 and the valve seat surface 32 of valve seat body 18 annular groove 36 formed allows communicating in the open condition of the valve with the spray orifices 27 of the perforated plate 22nd Zur exakten Führung des Ventilschließkörpers 7 und damit der Ventilnadel 5 während der Axialbewegung ist der Durchmesser der Führungsöffnung 16 so ausgebildet, daß der kugelförmige Ventilschließkörper 7 die Führungsöffnung 16 mit geringem radialen Abstand durchragt. For exact guidance of the valve closure member 7 and thus the valve needle 5 during the axial movement of the diameter of the guide hole 16 is formed so that the spherical valve closing body 7 projects through the guide opening 16 with a small radial distance.
  • Die exakte Einstellung des Hubes der Ventilnadel 5 und damit der statischen, während des stationären Öffnungszustandes des Ventils abgegebenen Strömungsmenge des Mediums erfolgt an dem fertig montierten Einspritzventil, dh unter anderem, daß der mit dem Ventilsitzkörper 18 verschweißte Lochkörper 22 an seinem Halterand 23 mit dem Sitzträger 1 verschweißt ist. The exact adjustment of the stroke of the valve needle 5 and thus of the static, discharged during the stationary opening state of the valve flow rate of the medium is at the fully assembled injector, that is, inter alia, that the welded with the valve seat body 18 perforated body 22 at its support edge 23 to the seat carrier 1 is welded. Stimmt die statische, von dem Ventil abgegebene und mittels eines Meßgefäßes 37 gemessene Istmenge des Mediums nicht mit der gewünschten, vorgegebenen Sollmenge überein, so wird der Lochkörper 22 zur exakten Einstellung des Hubes der Ventilnadel 5 in axialer Richtung im Bereich zwischen der zweiten Schweißnaht 30 und der ersten Schweißnaht 24 mittels eines Werkzeuges 38 derart gestreckt und damit gegebenenfalls plastisch verformt, bis die gemessene Mediumistmenge mit der vorgegebenen Mediumsollmenge übereinstimmt. the static, discharged from the valve and measured by means of a measuring vessel 37 actual quantity of the medium does not match the desired predetermined desired quantity match, the perforated body 22 for precise adjustment of the stroke of the valve needle 5 in the axial direction in the region between the second weld seam 30, and is the first weld seam 24 in such stretched by means of a tool 38 and optionally plastically deformed until the measured Mediumistmenge coincides with the predetermined desired medium quantity.
  • Das erfindungsgemäße Einspritzventil und das erfindungsgemäße Verfahren zur Herstellung eines Einspritzventils erlauben auf einfache Art und Weise die exakte Einstellung der statischen, während des stationären Öffnungszustandes des Einspritzventils abgegebenen Strömungsmenge eines Mediums an dem fertig montierten Einspritzventil. The injection valve according to the invention and the inventive method for the preparation of an injection valve to allow a simple way to accurately set the static discharged during the stationary opening state of the injector flow rate of a medium to the completely assembled injector.
  • An dem Umfang des Sitzträgers 1 ist an seinem stromabwärtigen, der Magnetspule 10 abgewandten Ende eine Schutzkappe 45 angeordnet und mittels einer Rastverbindung 46 mit dem Umfang des Sitzträgers 1 verbunden. At the periphery of the seat carrier 1 a protective cap 45 is disposed and connected by means of a snap connection 46 to the periphery of the seat carrier 1 at its downstream, the magnet coil 10 facing away from the end. Die Schutzkappe 45 liegt mit einem ersten stirnseitigen Radialabschnitt 47 an einer Stirnseite 48 des Sitzträgers 1 an. The protective cap 45 is located on a first frontal radial portion 47 at one end face 48 of the seat support. 1 In der Magnetspule 10 zugewandter Richtung schließen sich an den ersten Radialabschnitt 47 der Schutzkappe 45 zunächst ein axial verlaufender Parallelabschnitt 49 und daran ein radial nach außen weisender zweiter Radialabschnitt 50 an. In the magnetic coil 10 facing the direction of the protective cap 45, first an axially extending portion 49 and parallel thereto, a radially outwardly facing second radial section 50 join at the first radial portion 47th Ein Dichtring 51 ist in einer Ringnut 53 angeordnet, deren Seitenflächen durch eine der Magnetspule 10 zugewandte Stirnseite 54 des zweiten Radialabschnittes 50 der Schutzkappe 45 und durch eine radial nach außen weisende Anlagefläche 55 des Sitzträgers 1 sowie deren Nutgrund 57 durch den Umfang des Sitzträgers 1 gebildet werden. A sealing ring 51 is disposed in an annular groove 53 whose side faces facing through one of the magnetic coil 10 end face 54 of the second radial portion 50 of the protective cap 45 and formed by a radially outwardly facing abutment surface 55 of the seat support 1 and whose groove bottom 57 by the periphery of the seat carrier 1 become. Der Dichtring 51 dient zur Abdichtung zwischen dem Umfang des Brennstoffeinspritzventils und einer nicht dargestellten Ventilaufnahme beispielsweise der Ansaugleitung der Brennkraftmaschine. The sealing ring 51 serves to seal between the periphery of the fuel injection valve and a valve receptacle, for example, the intake pipe of the internal combustion engine, not shown.

Claims (9)

  1. Injection valve, especially fuel-injection valve for fuel-injection systems of internal-combustion engines, with a movable valve needle (5), with a valve-seat body (18) which is arranged in a longitudinal orifice of a tubular seat carrier (1), the said longitudinal orifice being concentric to a valve longitudinal axis (2), and which has a valve-seat face (32) co-operating with the valve needle, as well as with a perforated body (22) arranged downstream of the valve-seat body (18) and having at least one injection orifice, characterized in that the perforated body (22) is fixedly connected, on its end face (20) confronting the valve-seat body (18), to one end face (19) of the valve-seat body (18) and, on its circumference, to the wall of the longitudinal orifice (3) of the seat carrier (1).
  2. Injection valve according to Claim 1, with a pot-shaped perforated body which has a peripheral holding edge, characterized in that the holding edge (23) of the perforated body (22) extends away from the valve-seat body (18) in the axial direction, and in that the holding edge (23) is fixedly connected at its free end (26) to the wall of the longitudinal orifice (3) of the seat carrier (1).
  3. Injection valve according to Claim 2, characterized in that the holding edge (23) of the perforated body (22) is bent outwards towards its end (26) and at its end (26) has a larger diameter than the diameter of the longitudinal orifice (3) of the seat carrier (1).
  4. Injection valve according to one of the preceding claims, characterized in that the circumference of the valve-seat body (18) has a smaller diameter than the diameter of the longitudinal orifice (3) of the seat carrier (1).
  5. Injection valve according to one of the preceding claims, characterized in that the perforated body (22) is sealingly connected, on its end face (20), to the end face (19) of the valve-seat body (18) by means of a first continuous welding seam (24) and, on its circumference, to the wall of the longitudinal orifice (3) of the seat carrier (1) by means of a second continuous welding seam (30).
  6. Injection valve according to Claim 5, characterized in that the first welding seam (24) and/or the second welding seam (3) are formed by laser welding.
  7. Process for the manufacture of an injection valve, especially a fuel-injection valve for fuel-injection systems of internal-combustion engines, with a tubular seat carrier (1) having a longitudinal orifice which is concentric to a valve longitudinal axis (2) and into which a movable valve needle (5) is inserted, with a valve-seat body (18) which has a valve-seat face (32) co-operating with the valve needle, and with a pot-shaped perforated body (22) which has at least one injection orifice (27), a bottom part (21) bearing on the valve-seat body and a peripheral holding edge (23), characterized in that, in a first process step, the valve-seat body (18), the circumference of which has a smaller diameter than the longitudinal orifice (3) of the seat carrier (1), is connected to the bottom part (21) of the perforated body (22) by means of a first welding seam (24), the holding edge (23) of the perforated body (22), the said holding edge being bent outwards away from the valve-seat body (18), having at its free end (26) a larger diameter than the diameter of the longitudinal orifice (3) of the seat carrier (1), in a second process step the valve-seat part consisting of the valve-seat body (18) and of the perforated body (22) is inserted into the longitudinal orifice (3) of the seat carrier (1) for the presetting of the stroke of the valve needle (5), in a third process step the perforated body (22) is fixedly connected, at the end (26) of its holding edge (23), to the wall of the longitudinal orifice (3) of the seat carrier (1) by means of a second welding seam (30), in a fourth process step the static actual quantity of medium discharged during the stationary opening state of the injection valve is measured and is compared with a desired predetermined desired quantity of medium, and in a fifth process step, for the exact setting of the valve-needle stroke, the perforated body (22) is deformed in the axial direction, in the region between the first welding seam (24) and the second welding seam (30), until the measured actual quantity of medium coincides with the predetermined desired quantity of medium.
  8. Process according to Claim 7, characterized in that the first welding seam (24) and the second welding seam (30) are formed continuously and sealingly.
  9. Process according to one of Claims 7 or 8, characterized in that the first welding seam (24) and/or the second welding seam (30) are formed by means of laser welding.
EP19910912689 1990-08-24 1991-07-17 Fuel-injection valve and process for its manufacture Expired - Lifetime EP0497931B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4026721 1990-08-24
DE19904026721 DE4026721A1 (en) 1990-08-24 1990-08-24 Injector and method for manufacturing an injection valve
PCT/DE1991/000589 WO1992003653A1 (en) 1990-08-24 1991-07-17 Fuel-injection valve and process for its manufacture

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EP0497931A1 EP0497931A1 (en) 1992-08-12
EP0497931B1 true EP0497931B1 (en) 1995-04-05

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EP (1) EP0497931B1 (en)
JP (1) JP3048634B2 (en)
KR (1) KR100190480B1 (en)
DE (1) DE4026721A1 (en)
ES (1) ES2072002T3 (en)
RU (1) RU2062347C1 (en)
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US4552312A (en) * 1983-01-14 1985-11-12 Tohoku Mikuni Kogyo Kabushiki Kaisha Fuel injection valve
DE3602956A1 (en) * 1986-01-31 1987-08-06 Vdo Schindling Electromagnetically actuated fuel injection valve
US4699323A (en) * 1986-04-24 1987-10-13 General Motors Corporation Dual spray cone electromagnetic fuel injector
DE3841142C2 (en) * 1988-12-07 1994-09-29 Bosch Gmbh Robert Injector
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998014701A1 (en) 1996-10-02 1998-04-09 Robert Bosch Gmbh Valve and method for the manufacture thereof

Also Published As

Publication number Publication date
JP3048634B2 (en) 2000-06-05
US5390411A (en) 1995-02-21
KR100190480B1 (en) 1999-06-01
WO1992003653A1 (en) 1992-03-05
EP0497931A1 (en) 1992-08-12
JPH05501748A (en) 1993-04-02
DE4026721A1 (en) 1992-02-27
US5263648A (en) 1993-11-23
RU2062347C1 (en) 1996-06-20
ES2072002T3 (en) 1995-07-01

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