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 EP91912689A EP91912689A EP0497931B1 EP 0497931 B1 EP0497931 B1 EP 0497931B1 EP 91912689 A EP91912689 A EP 91912689A EP 91912689 A EP91912689 A EP 91912689A EP 0497931 B1 EP0497931 B1 EP 0497931B1
Authority
EP
European Patent Office
Prior art keywords
valve
seat
injection
welding seam
perforated
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
EP91912689A
Other languages
German (de)
French (fr)
Other versions
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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Publication date
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Publication of EP0497931A1 publication Critical patent/EP0497931A1/en
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Publication of EP0497931B1 publication Critical patent/EP0497931B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
    • Y10T29/49421—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metallurgical bonding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
    • Y10T29/49425—Valve or choke making with assembly, disassembly or composite article making including metallurgical bonding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49764—Method of mechanical manufacture with testing or indicating
    • Y10T29/49771—Quantitative measuring or gauging

Definitions

  • the invention is based on an injection valve and a method for producing an injection valve according to the preamble of claims 1 and 7, respectively.
  • an injection valve is already known which has a cup-shaped perforated body downstream of its valve seat surface. The perforated body is firmly clamped between the nozzle body and a processing sleeve.
  • the end face of the nozzle body, against which the stop plate determining the residual air gap of the armature with respect to the core lies is ground.
  • this valve and the manufacturing process used have the disadvantage that the end face of the nozzle body can only be ground with a partially dismantled valve, so that the exact setting of the valve needle stroke is very complex.
  • DE 38 41 142 A1 shows an injection valve with a cup-shaped perforated body which extends with its holding edge facing away from the valve seat surface in the axial direction and is connected with the end of the holding edge to the wall of the receiving bore of the valve seat body.
  • the valve seat body is in the longitudinal opening of the seat carrier inserted and firmly connected to it, the insertion depth of the valve seat body in the longitudinal opening of the seat carrier determines the valve needle stroke. With this valve, too, the valve needle stroke can no longer be adjusted in the fully assembled state without at least partially dismantling the valve again.
  • valve seat body that has at least one spray opening is described in DE 38 31 196 A1.
  • the valve seat body is pressed into the longitudinal opening of the seat carrier, the press-in depth determining the valve needle stroke.
  • the setting of the valve needle stroke can be carried out on the fully assembled injection valve, but when the valve seat body is pressed into the seat carrier there is a risk of chip formation on the valve seat body and / or the seat carrier.
  • the injection valve according to the invention with the characterizing features of claim 1 and the method for producing an injection valve with the characterizing features of claim 7 have the advantage of a particularly by the deformation of the valve seat part consisting of valve seat body and perforated body in the axial direction in the area between the fastening points of the perforated body simple and inexpensive, fully automatable and exact setting of the valve needle stroke and thus the static flow quantity of a medium given off during the stationary opening state of the injection valve.
  • there is a simple construction of the injection valve with a simple and inexpensive manufacture of the valve seat body and the perforated body It is ensured that the axial extension of the perforated body in the area of the holes does not change due to the assembly of the injection valve and the desired, predetermined spray characteristic is achieved.
  • a holding edge of the pot-shaped perforated body extends away from the valve seat body in the axial direction and the holding edge is firmly connected at its free end to the wall of the longitudinal opening of the seat carrier.
  • the holding edge of the perforated body is bent outwards towards its free end, as a result of which it has a larger diameter at its end than the diameter of the longitudinal opening of the seat support, so that the holding edge when the valve part is inserted into the longitudinal opening of the seat support has a radial spring action and lies with a slight pressure on the wall of the longitudinal opening without the risk of chip formation on the perforated body and / or the longitudinal opening of the seat support.
  • the circumference of the valve seat body has a smaller diameter than the diameter of the longitudinal opening of the seat carrier. This prevents chips from being formed on the valve seat body and / or the longitudinal opening of the seat carrier when the valve seat part consisting of valve seat body and perforated body is inserted into the seat carrier. In addition, it is not necessary to maintain a narrow dimensional tolerance on the circumference of the valve seat body during manufacture, so that the manufacturing costs of the valve seat body are substantially reduced.
  • the perforated body is tightly connected on its end face to the end face of the valve seat body by means of a first circumferential weld seam and on its circumference to the wall of the longitudinal opening of the seat carrier by means of a second circumferential weld seam.
  • first weld seam and the second weld seam are designed to be particularly safe and reliable and in a simple manner by means of laser welding.
  • the parts to be welded are only slightly heated.
  • FIG. 1 An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.
  • the figure shows a partially illustrated injection valve according to the embodiment.
  • a fuel injector for fuel injection systems of mixture-compressing spark-ignition internal combustion engines is partially shown.
  • the fuel injector has a tubular seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2.
  • tubular valve needle 5 which is connected at its downstream end 6 to a spherical valve closing body 7.
  • the fuel injector is actuated in a known manner, for example electromagnetically.
  • An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening or closing the fuel injection valve.
  • the armature 11 is connected to the end of the valve needle 5 facing away from the valve closing body 7 and on the core 12 aligned.
  • a guide opening 16 of a valve seat body 18 serves to guide the valve closing body 7 during the axial movement.
  • the circumference of the valve seat body 18 has a smaller diameter than the diameter of the longitudinal opening 3 of the seat carrier 1.
  • the valve seat body 18 On its one end face 19 facing away from the valve closing body 7, the valve seat body 18 is concentrically and firmly connected to a bottom part 21 of a perforated body 22, so that the end part 20 of the bottom part 21 bears against the end face 19 of the valve seat body 18.
  • the valve seat body 18 and the perforated body 22 are connected, for example, by a circumferential and tight, e.g. first weld seam 24 formed by a laser. For this reason, good weldability must also be ensured when selecting the material for the perforated body 22. This type of installation avoids the risk of deformation of the base part 21 in the region of its at least one, for example two, spray openings 27 formed by eroding.
  • the perforated body 22 has a cup-shaped cross-sectional shape.
  • the base part 21 of the perforated body 22 is adjoined by a circumferential holding edge 23 which extends in the axial direction away from the valve seat body 18 and is conically bent outwards up to one end 26.
  • the holding edge 23 has a larger diameter at its end 26 than the diameter of the longitudinal opening 3 of the seat support 1.
  • valve seat part consisting of the valve seat body 18 and the perforated body 22 is inserted into the longitudinal opening 3. Due to the smaller diameter of the circumference of the valve seat body 18 compared to the longitudinal opening 3 of the seat support 1, there is only radial pressure between the longitudinal opening 3 and the slightly conical outwardly bent retaining edge 23 of the perforated body 22, the retaining edge 23 having a radial spring action the wall of the longitudinal opening 3 exerts. As a result, chip insertion both at the valve seat part and at the longitudinal opening 3 is avoided when the valve seat part consisting of valve seat body 18 and perforated body 22 is inserted into the longitudinal opening 3 of the seat carrier 1.
  • valve seat body 18 In addition, in the manufacture of the valve seat body 18 it is not necessary to maintain a narrow dimensional tolerance on its circumference, since the valve seat body 18 has a slight play in the radial opening in the longitudinal opening 3 of the seat carrier 1, so that the manufacturing costs compared to a valve seat body pressed into the longitudinal opening 3 be significantly reduced.
  • the insertion depth of the valve seat part into the longitudinal opening 3 of the seat support 1 determines the presetting of the stroke of the valve needle 5, since the one end position of the valve needle 5 is fixed when the solenoid coil 10 is not energized by the valve closing body 7 resting on a valve seat surface 32 of the valve seat body 18.
  • the other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The path between these two end positions of the valve needle 5 represents the stroke.
  • the holding edge 23 of the perforated body 22 is connected to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30.
  • the second weld 30 is exactly like the first weld 24 z. B. formed by means of a laser, so that there is a safe and reliable weld which can be produced in a simple manner and in which the heating of the parts to be welded to one another is low.
  • valve seat body 18 and perforated body 22 and of perforated body 22 and seat support 1 is required so that the medium used, for example a fuel, does not pass between the longitudinal opening 3 of the seat support 1 and the circumference of the valve seat body 18 to the spray openings 27 or between the Longitudinal opening 3 of the seat support 1 and the holding edge 23 of the perforated body 22 can flow directly into an intake line of the internal combustion engine.
  • medium used for example a fuel
  • fastening points on the perforated body 22 there are two fastening points on the perforated body 22, one fastening point being the first weld 24 with the valve seat body 18 and the second fastening point the second weld 30 with the seat support 1.
  • the spherical valve closing body 7 interacts with the valve seat surface 32 of the valve seat body 18, which tapers conically in the flow direction and is formed in the axial direction between the guide opening 16 and the end face 19 of the valve seat body 18.
  • the guide opening 16 as shown on the left of the longitudinal valve axis 2 in the figure, has at least one flow passage 33 which prevents a flow of the medium from the valve interior 35 delimited in the radial direction by the longitudinal opening 3 of the seat support 1 to a flow direction between the guide opening 16 and the valve seat surface 32 of the valve seat body 18 formed annular groove 36 which is in the open state of the valve with the spray openings 27 of the perforated plate 22 in connection.
  • the diameter of the guide opening is 16 designed so that the spherical valve closing body 7 projects through the guide opening 16 with a small radial distance.
  • the perforated body 22 is used for the exact adjustment of the stroke of the valve needle 5 in the axial direction in the area between the second weld seam 30 and of the first weld seam 24 is stretched in this way by means of a tool 38 and, if necessary, is plastically deformed until the measured actual medium quantity corresponds to the predetermined medium target quantity.
  • the injection valve according to the invention and the method according to the invention for producing an injection valve allow in a simple manner the exact setting of the static flow quantity of a medium which is emitted during the stationary opening state of the injection valve at the fully assembled injection valve.
  • a protective cap 45 is arranged on the periphery of the seat carrier 1 at its downstream end facing away from the magnet coil 10 and is connected to the periphery of the seat carrier 1 by means of a latching connection 46.
  • the protective cap 45 rests with a first radial section 47 on an end face 48 of the seat support 1.
  • the first radial section 47 of the protective cap 45 is initially followed by an axially extending parallel section 49 and then by a radially outwardly pointing section second radial section 50.
  • a sealing ring 51 is arranged in an annular groove 53, the side surfaces of which are formed by an end face 54 of the second radial section 50 of the protective cap 45 facing the magnetic coil 10 and by a radially outwardly facing contact surface 55 of the seat support 1 and the groove base 57 thereof by the circumference of the seat support 1 become.
  • the sealing ring 51 serves to seal between the circumference of the fuel injection valve and a valve receptacle, not shown, for example the intake line of the internal combustion engine.

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. Der Lochkörper ist zwischen dem Düsenkörper und einer Aufbereitungshülse fest eingespannt. 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. 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.The invention is based on an injection valve and a method for producing an injection valve according to the preamble of claims 1 and 7, respectively. From DE 37 10 467 A1 an injection valve is already known which has a cup-shaped perforated body downstream of its valve seat surface. The perforated body is firmly clamped between the nozzle body and a processing sleeve. In order to adjust the stroke of the valve needle and thus the static flow quantity of a medium given off during the stationary opening state of the injection valve, the end face of the nozzle body, against which the stop plate determining the residual air gap of the armature with respect to the core lies, is ground. However, this valve and the manufacturing process used have the disadvantage that the end face of the nozzle body can only be ground with a partially dismantled valve, so that the exact setting of the valve needle stroke is very complex.

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. 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. Auch bei diesem Ventil kann im fertig montierten Zustand keine Einstellung des Ventilnadelhubes mehr vorgenommen werden, ohne das Ventil zumindest teilweise wieder zu demontieren.DE 38 41 142 A1 shows an injection valve with a cup-shaped perforated body which extends with its holding edge facing away from the valve seat surface in the axial direction and is connected with the end of the holding edge to the wall of the receiving bore of the valve seat body. The valve seat body is in the longitudinal opening of the seat carrier inserted and firmly connected to it, the insertion depth of the valve seat body in the longitudinal opening of the seat carrier determines the valve needle stroke. With this valve, too, the valve needle stroke can no longer be adjusted in the fully assembled state without at least partially dismantling the valve again.

Ein Einspritzventil mit einem Ventilsitzkörper, der wenigstens eine Abspritzöffnung aufweist, ist in der DE 38 31 196 A1 beschrieben. Der Ventilsitzkörper wird in die Längsöffnung des Sitzträgers eingepreßt, wobei die Einpreßtiefe den Ventilnadelhub bestimmt. 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.An injection valve with a valve seat body that has at least one spray opening is described in DE 38 31 196 A1. The valve seat body is pressed into the longitudinal opening of the seat carrier, the press-in depth determining the valve needle stroke. The setting of the valve needle stroke can be carried out on the fully assembled injection valve, but when the valve seat body is pressed into the seat carrier there is a risk of chip formation on the valve seat body and / or the seat carrier.

Vorteile der ErfindungAdvantages 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. Zudem ergibt sich eine einfache Konstruktion des Einspritzventils mit einer einfachen und kostengünstigen Herstellung des Ventilsitzkörpers und des Lochkörpers. 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.The injection valve according to the invention with the characterizing features of claim 1 and the method for producing an injection valve with the characterizing features of claim 7 have the advantage of a particularly by the deformation of the valve seat part consisting of valve seat body and perforated body in the axial direction in the area between the fastening points of the perforated body simple and inexpensive, fully automatable and exact setting of the valve needle stroke and thus the static flow quantity of a medium given off during the stationary opening state of the injection valve. In addition, there is a simple construction of the injection valve with a simple and inexpensive manufacture of the valve seat body and the perforated body. It is ensured that the axial extension of the perforated body in the area of the holes does not change due to the assembly of the injection valve and the desired, predetermined spray 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.The measures listed in the subclaims enable advantageous developments and improvements of the valve specified in claim 1 and of the method specified in claim 7.

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. 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.It is advantageous if a holding edge of the pot-shaped perforated body extends away from the valve seat body in the axial direction and the holding edge is firmly connected at its free end to the wall of the longitudinal opening of the seat carrier. On the one hand, a firm and secure hold of the valve part consisting of valve seat body and perforated body is ensured in the longitudinal opening of the seat carrier, on the other hand, the perforated body can be deformed in a simple manner in the area between its fastening points for exact adjustment of the valve needle stroke in the axial direction.

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 outwards towards its free end, as a result of which it has a larger diameter at its end than the diameter of the longitudinal opening of the seat support, so that the holding edge when the valve part is inserted into the longitudinal opening of the seat support has a radial spring action and lies with a slight pressure on the wall of the longitudinal opening without the risk of chip formation on the perforated body and / or the longitudinal opening of the seat support.

Dabei ist es von Vorteil, wenn der Umfang des Ventilsitzkörpers einen kleineren Durchmesser aufweist als den Durchmesser der Längsöffnung des Sitzträgers. 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. 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.It is advantageous if the circumference of the valve seat body has a smaller diameter than the diameter of the longitudinal opening of the seat carrier. This prevents chips from being formed on the valve seat body and / or the longitudinal opening of the seat carrier when the valve seat part consisting of valve seat body and perforated body is inserted into the seat carrier. In addition, it is not necessary to maintain a narrow dimensional tolerance on the circumference of the valve seat body during manufacture, so that the manufacturing costs 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 from flowing between the circumference of the valve seat body and the longitudinal opening of the seat carrier to the at least one spray opening and / or between the holding edge of the perforated body and the longitudinal opening of the seat carrier to an intake line of the internal combustion engine, it is advantageous if the perforated body is tightly connected on its end face to the end face of the valve seat body by means of a first circumferential weld seam and on its circumference to the wall of the longitudinal opening of the seat carrier by means of a second circumferential weld seam.

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. Zudem erfolgt dabei nur eine geringe Erwärmung der miteinander zu verschweißenden Teile.It is particularly advantageous here if the first weld seam and the second weld seam are designed to be particularly safe and reliable and in a simple manner by means of laser welding. In addition, the parts to be welded are only slightly heated.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur zeigt ein teilweise dargestelltes Einspritzventil gemäß des Ausführungsbeispiels.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. The figure shows a partially illustrated injection valve according to the embodiment.

Beschreibungdescription

In der Figur ist beispielsweise ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Brennstoffeinspritzventil hat einen rohrförmigen Sitzträger 1, in dem konzentrisch zu einer Ventillängsachse 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 verbunden ist. Die Betätigung des Brennstoffeinspritzventils erfolgt in bekannter Weise beispielsweise elektromagnetisch. 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.In the figure, for example, a fuel injector for fuel injection systems of mixture-compressing spark-ignition internal combustion engines is partially shown. The fuel injector has a tubular seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2. In the longitudinal opening 3 is a z. B. arranged tubular valve needle 5, which is connected at its downstream end 6 to a spherical valve closing body 7. The fuel injector is actuated in a known manner, for example electromagnetically. An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 is used for the axial movement of the valve needle 5 and thus for opening or closing the fuel injection valve. The armature 11 is connected to the end of the valve needle 5 facing away from the valve closing body 7 and on the core 12 aligned.

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. 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. Die Verbindung von Ventilsitzkörper 18 und Lochkörper 22 erfolgt beispielsweise durch eine umlaufende und dichte, z.B. 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. 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.A guide opening 16 of a valve seat body 18 serves to guide the valve closing body 7 during the axial movement. The circumference of the valve seat body 18 has a smaller diameter than the diameter of the longitudinal opening 3 of the seat carrier 1. On its one end face 19 facing away from the valve closing body 7, the valve seat body 18 is concentrically and firmly connected to a bottom part 21 of a perforated body 22, so that the end part 20 of the bottom part 21 bears against the end face 19 of the valve seat body 18. The valve seat body 18 and the perforated body 22 are connected, for example, by a circumferential and tight, e.g. first weld seam 24 formed by a laser. For this reason, good weldability must also be ensured when selecting the material for the perforated body 22. This type of installation avoids the risk of deformation of the base part 21 in the region of its at least one, for example two, spray openings 27 formed by eroding.

Der Lochkörper 22 weist eine topfförmige Querschnittsform auf. 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. Dabei weist der Halterand 23 an seinem Ende 26 einen größeren Durchmesser auf als den Durchmesser der Längsöffnung 3 des Sitzträgers 1.The perforated body 22 has a cup-shaped cross-sectional shape. The base part 21 of the perforated body 22 is adjoined by a circumferential holding edge 23 which extends in the axial direction away from the valve seat body 18 and is conically bent outwards up to one end 26. The holding edge 23 has a larger diameter at its end 26 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. 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. 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. 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. 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. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 am Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt den Hub dar.When the valve needle 5 is inserted into the longitudinal opening 3 of the seat support 1, the valve seat part consisting of the valve seat body 18 and the perforated body 22 is inserted into the longitudinal opening 3. Due to the smaller diameter of the circumference of the valve seat body 18 compared to the longitudinal opening 3 of the seat support 1, there is only radial pressure between the longitudinal opening 3 and the slightly conical outwardly bent retaining edge 23 of the perforated body 22, the retaining edge 23 having a radial spring action the wall of the longitudinal opening 3 exerts. As a result, chip insertion both at the valve seat part and at the longitudinal opening 3 is avoided when the valve seat part consisting of valve seat body 18 and perforated body 22 is inserted into the longitudinal opening 3 of the seat carrier 1. In addition, in the manufacture of the valve seat body 18 it is not necessary to maintain a narrow dimensional tolerance on its circumference, since the valve seat body 18 has a slight play in the radial opening in the longitudinal opening 3 of the seat carrier 1, so that the manufacturing costs compared to a valve seat body pressed into the longitudinal opening 3 be significantly reduced. The insertion depth of the valve seat part into the longitudinal opening 3 of the seat support 1 determines the presetting of the stroke of the valve needle 5, since the one end position of the valve needle 5 is fixed when the solenoid coil 10 is not energized by the valve closing body 7 resting on a valve seat surface 32 of the valve seat body 18. The other end position of the valve needle 5 is determined when the solenoid 10 is excited, for example by the armature 11 resting on the core 12. The path between these two end positions of the valve needle 5 represents the stroke.

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. Die zweite Schweißnaht 30 ist genau wie die erste Schweißnaht 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.At its end 26, which bears against the longitudinal opening 3 of the seat support 1, the holding edge 23 of the perforated body 22 is connected to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30. The second weld 30 is exactly like the first weld 24 z. B. formed by means of a laser, so that there is a safe and reliable weld which can be produced in a simple manner and in which the heating of the parts to be welded to one another is low.

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 valve seat body 18 and perforated body 22 and of perforated body 22 and seat support 1 is required so that the medium used, for example a fuel, does not pass between the longitudinal opening 3 of the seat support 1 and the circumference of the valve seat body 18 to the spray openings 27 or between the Longitudinal opening 3 of the seat support 1 and the holding edge 23 of the perforated body 22 can flow directly into an intake line 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 there are two fastening points on the perforated body 22, one fastening point being the first weld 24 with the valve seat body 18 and the second fastening point the second weld 30 with the seat support 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. 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. 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.The spherical valve closing body 7 interacts with the valve seat surface 32 of the valve seat body 18, which tapers conically in the flow direction and is formed in the axial direction between the guide opening 16 and the end face 19 of the valve seat body 18. The guide opening 16, as shown on the left of the longitudinal valve axis 2 in the figure, has at least one flow passage 33 which prevents a flow of the medium from the valve interior 35 delimited in the radial direction by the longitudinal opening 3 of the seat support 1 to a flow direction between the guide opening 16 and the valve seat surface 32 of the valve seat body 18 formed annular groove 36 which is in the open state of the valve with the spray openings 27 of the perforated plate 22 in connection. For exact guidance of the valve closing body 7 and thus the valve needle 5 during the axial movement, the diameter of the guide opening is 16 designed 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, d.h. unter anderem, daß der mit dem Ventilsitzkörper 18 verschweißte Lochkörper 22 an seinem Halterand 23 mit dem Sitzträger 1 verschweißt ist. 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 exact setting of the stroke of the valve needle 5 and thus the static flow quantity of the medium which is emitted during the stationary opening state of the valve is carried out on the fully assembled injection valve, i.e. among other things, that the perforated body 22 welded to the valve seat body 18 is welded to the seat support 1 at its holding edge 23. If the static actual quantity of the medium emitted by the valve and measured by means of a measuring vessel 37 does not match the desired, predetermined target quantity, then the perforated body 22 is used for the exact adjustment of the stroke of the valve needle 5 in the axial direction in the area between the second weld seam 30 and of the first weld seam 24 is stretched in this way by means of a tool 38 and, if necessary, is plastically deformed until the measured actual medium quantity corresponds to the predetermined medium target 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 method according to the invention for producing an injection valve allow in a simple manner the exact setting of the static flow quantity of a medium which is emitted during the stationary opening state of the injection valve at the fully assembled injection valve.

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. Die Schutzkappe 45 liegt mit einem ersten stirnseitigen Radialabschnitt 47 an einer Stirnseite 48 des Sitzträgers 1 an. 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. 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. Der Dichtring 51 dient zur Abdichtung zwischen dem Umfang des Brennstoffeinspritzventils und einer nicht dargestellten Ventilaufnahme beispielsweise der Ansaugleitung der Brennkraftmaschine.A protective cap 45 is arranged on the periphery of the seat carrier 1 at its downstream end facing away from the magnet coil 10 and is connected to the periphery of the seat carrier 1 by means of a latching connection 46. The protective cap 45 rests with a first radial section 47 on an end face 48 of the seat support 1. In the direction facing the magnet coil 10, the first radial section 47 of the protective cap 45 is initially followed by an axially extending parallel section 49 and then by a radially outwardly pointing section second radial section 50. A sealing ring 51 is arranged in an annular groove 53, the side surfaces of which are formed by an end face 54 of the second radial section 50 of the protective cap 45 facing the magnetic coil 10 and by a radially outwardly facing contact surface 55 of the seat support 1 and the groove base 57 thereof by the circumference of the seat support 1 become. The sealing ring 51 serves to seal between the circumference of the fuel injection valve and a valve receptacle, not shown, for example the intake line of the internal combustion engine.

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.
EP91912689A 1990-08-24 1991-07-17 Fuel-injection valve and process for its manufacture Expired - Lifetime EP0497931B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4026721A DE4026721A1 (en) 1990-08-24 1990-08-24 INJECTION VALVE AND METHOD FOR PRODUCING AN INJECTION VALVE
DE4026721 1990-08-24
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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US (2) US5263648A (en)
EP (1) EP0497931B1 (en)
JP (1) JP3048634B2 (en)
KR (1) KR100190480B1 (en)
DE (2) DE4026721A1 (en)
ES (1) ES2072002T3 (en)
RU (1) RU2062347C1 (en)
WO (1) WO1992003653A1 (en)

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KR100190480B1 (en) 1999-06-01
DE4026721A1 (en) 1992-02-27
EP0497931A1 (en) 1992-08-12
KR920702466A (en) 1992-09-04
JPH05501748A (en) 1993-04-02
US5390411A (en) 1995-02-21
WO1992003653A1 (en) 1992-03-05
DE59105118D1 (en) 1995-05-11
ES2072002T3 (en) 1995-07-01
RU2062347C1 (en) 1996-06-20
JP3048634B2 (en) 2000-06-05
US5263648A (en) 1993-11-23

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