EP0718490A2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP0718490A2
EP0718490A2 EP95114024A EP95114024A EP0718490A2 EP 0718490 A2 EP0718490 A2 EP 0718490A2 EP 95114024 A EP95114024 A EP 95114024A EP 95114024 A EP95114024 A EP 95114024A EP 0718490 A2 EP0718490 A2 EP 0718490A2
Authority
EP
European Patent Office
Prior art keywords
carrier
valve seat
section
perforated
seat body
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.)
Withdrawn
Application number
EP95114024A
Other languages
German (de)
French (fr)
Other versions
EP0718490A3 (en
Inventor
Assadollah Dipl.-Ing. Awarzamani
Norbert Dipl.-Ing. Belzner (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0718490A2 publication Critical patent/EP0718490A2/en
Publication of EP0718490A3 publication Critical patent/EP0718490A3/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injector is already known from DE-OS 38 41 142, in which a perforated disk is fastened to a valve seat body by means of a circumferential weld seam.
  • the weld seam must be far away from the spray openings to avoid deformation of the thin perforated disc.
  • the relatively thick perforated disk is cup-shaped in order to prevent the perforated disk from lifting off due to the prevailing fuel pressure, as a result of which the spray pattern of the sprayed fuel changes in an undesired manner.
  • the effort for the manufacture and assembly of the perforated disc is very large.
  • a fuel injector is already known from DE-OS 41 23 692, in which a thinner perforated disk is used, which in turn is supported by a thicker support disk downstream of the perforated disk, which has a central through opening.
  • the support disc is pot-shaped and together with the Perforated disc welded to the valve seat body by means of a circumferential weld seam.
  • the supporting disk mainly has the function of improving the stability of the perforated disk, and it is firmly connected to a perforated disk.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a very good variation in the use of perforated disks with different dimensions, in particular different thickness and diameter, is possible in a simple and inexpensive manner, whereby the flow rates of the perforated disks with very little effort can be easily varied and different beam patterns can also be generated.
  • a perforated disk carrier is provided downstream of a valve seat surface and has a carrier section shaped in such a way that a plurality of perforated disks with different dimensions can be inserted into it in a simple form.
  • the perforated disk carrier in a pot-shaped manner and to connect its circumferential retaining edge in a tight and firm manner with a valve seat carrier in its axial position after the setting of the valve seat body, so that this makes it possible to adjust the valve stroke. It is also advantageous to design the bottom part of the perforated disc carrier in a cup-shaped manner in order to be precisely in this cup-shaped support section to receive a perforated disc.
  • this support section is either frustoconical or truncated pyramid-shaped or with a plurality of axially successive step sections.
  • perforated disc carrier By using a perforated disc carrier, perforated discs with comparatively small dimensions can be used, so that material for the perforated discs can be saved in an advantageous manner.
  • FIG. 1 shows a partially illustrated injection valve
  • FIG. 2 shows a perforated disk carrier with a conical carrier section
  • FIG. 3 shows a perforated disk carrier with stepped carrier section
  • FIG. 4 perforated disks for the perforated disk carrier according to FIG. 2
  • FIG. 5 perforated disks for the perforated disk carrier according to FIG. 3
  • FIG. 6 shows a plan view a perforated disc carrier for square perforated discs
  • Figure 9 is a perforated disc with areas of different thickness.
  • the injection valve has a tubular valve 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.
  • the flats 8 on the valve closing body 7 allow fuel to flow in the direction of a valve seat surface 9.
  • the injection valve 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 against the spring force of a return spring, not shown, or for closing the injection valve.
  • the armature 11 is connected to the Valve closing body 7 facing away from the valve needle 5 by z. B. a weld seam connected by a laser and aligned with the core 12.
  • a guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement.
  • the cylindrical valve seat body 16 is arranged in the longitudinal opening 3 concentric to the longitudinal axis 2 of the valve.
  • the circumference of the valve seat body 16 has a slightly smaller diameter than the diameter of the longitudinal opening 3 of the valve seat carrier 1.
  • valve seat body 16 On its one lower end face 17 facing away from the valve closing body 7, the valve seat body 16 is provided with an outer ring portion 19 of a bottom part 20 of an inventive one, of which Thick disc-shaped perforated disc carrier 21 concentrically and firmly connected, so that the bottom part 20 rests with its upper end face 22 in the region of the ring portion 19 on the lower end face 17 of the valve seat body 16.
  • valve seat body 16 and z. B. cup-shaped perforated disc carrier 21 is carried out, for example, by a circumferential and tight, by means of a laser-formed first weld 23, which necessarily extends annularly on the ring portion 19.
  • the base part 20 has a cup-shaped, lower-lying support section 25, which extends at an axial distance from the lower end face 17 of the valve seat body 16 and into which a perforated disk 26 is inserted.
  • a circumferential retaining edge 28 which extends in the axial direction away from the valve seat body 16 and is conically bent outwards to the end thereof.
  • the holding edge 28 exerts a radial spring action on the wall of the longitudinal opening 3. This prevents chip formation on the valve seat part and on the longitudinal opening 3 when the valve seat part consisting of valve seat body 16, perforated disk 26 and perforated disk carrier 21 is inserted into the longitudinal opening 3 of the valve seat carrier 1.
  • the holding edge 28 of the perforated disc carrier 21 is connected at its free end to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30.
  • valve seat body 16 and perforated disk carrier 21 and of perforated disk carrier 21 and valve seat carrier 1 is required so that the medium used, for example a fuel, does not pass between the longitudinal opening 3 of the valve seat carrier 1 and the circumference of the valve seat body 16 or between the longitudinal opening 3 of the valve seat carrier 1 and the holding edge 28 of the perforated disc carrier 21 can flow directly into an intake line of the internal combustion engine.
  • medium used for example a fuel
  • the insertion depth of the valve seat part consisting of valve seat body 16, perforated disk 26 and perforated disk carrier 21 into the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid 10 is not excited due to the application of the Valve closing body 7 is fixed to the valve seat surface 9 of the valve seat body 16.
  • 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 thus represents the stroke.
  • the spherical valve closing body 7 interacts with the valve seat surface 9 of the valve seat body 16 which tapers in the shape of a truncated cone, which is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.
  • a protective cap 32 is arranged on the circumference of the valve seat support 1 at its downstream end facing away from the solenoid 10 and is connected to the valve seat support 1 by means of, for example, a snap-in connection.
  • a sealing ring 33 serves to seal between the circumference of the injection valve and a valve receptacle, not shown, for example the intake line of the internal combustion engine.
  • FIGS. 2 and 3 show two exemplary embodiments of the perforated disk carrier 21 according to the invention together with the valve seat body 16 in the valve seat carrier 1, the position of the components relative to one another and the shape of the perforated disk carrier 21 mainly being explained, which is why the perforated disks 26 and the weld seams 23, 30 is dispensed with in the figures.
  • the cup-shaped carrier section 25 of the base part 20 is largely conical or frustoconical.
  • the base part 20 does not extend further radially on the lower end face 17 of the valve seat body 16, but also with an axial component, so that there is a frustoconical taper 34 of the support section 25 in the direction away from the valve seat surface 9.
  • the frusto-conical taper 34 of the carrier section 25 ends at an axial distance of approximately 0.2 to 0.3 mm from the end face 17.
  • This conical taper 34 of the carrier section 25 is then joined to the longitudinal axis of the valve again by a flat, radially running, parallel to the ring section 19 and perpendicular to the longitudinal axis 2 of the bottom section 35, in which, for example, a circular, elliptical or square passage opening 36 is introduced in the center.
  • the fuel sprayed out of the perforated disk 26 to be metered ultimately emerges through this through opening 36.
  • the perforated disk carrier 21 in FIG. 3 differs from that shown in FIG. 2 only in the design of the carrier section 25.
  • the taper 34 of the carrier section 25 is not conical, but rather step-like.
  • the individual steps 37 of the support section 25 are designed, for example, in such a way that the respective circular step sections regularly decrease in diameter from the end face 17 to the bottom section 35. This means that both the axial extent of each step 37 and the extent of the reduction in diameter from one step 37 to the next step 37 should be constant.
  • three ( Figure 3) or four steps 37 are provided in the carrier section 25; however, a different number of stages 37 can be implemented at any time. In a training of the support section 25 with four stages 37 z.
  • each the axial distances of each step 37 to the end face 17 of the valve seat body 16 are meant.
  • four perforated disks 26 of different sizes can consequently be used in the carrier section 25 which tends to be cup-shaped despite the stages 37.
  • a through opening 36 is again provided in the bottom section 35 of the support section 25.
  • FIG. 4 illustrates the shape of the perforated disks 26, which are particularly suitable for use with perforated disk carriers 21 according to FIGS. 1 and 2.
  • the perforated disks 26 also have a conical peripheral surface 39 as an outer radial boundary, which has the same inclination as the frustoconical taper 34 of the perforated disk carrier 21.
  • the peripheral surfaces 39 of the perforated disks 26 lie completely against the conical surface of the taper 34.
  • an upper end face 40 of the perforated disk 26 facing the valve seat surface 9 has such a large diameter as the largest free diameter of the carrier section 25 surrounded by the ring section 19 directly on the end face 17 of the valve seat body 16, so that the perforated disk 26 also its end face 40 always abuts the end face 17.
  • the various perforated disks 26 which can be used in the carrier sections 25 of the perforated disk carrier 21 consequently differ in their axial thickness d and thus also in the size of the conical peripheral surface 39 and in their diameter of the lower end face 41 opposite the upper end face 40.
  • Corresponding to the axial distance from Bottom section 35 to the end face 17 can perforated disks 26 z.
  • the four spray orifices 27, for example, are located e.g. B. symmetrical about the valve longitudinal axis 2 in Distributed shape of corner points of a square and thus have the same distance to each other and to the valve longitudinal axis 2.
  • the perforated disks 26 shown in FIG. 5 are particularly suitable for use in perforated disk carriers 21 with a stepped carrier section 25, as shown in FIG. 3. These perforated disks 26 in turn have dimensions such that they always rest with their upper end face 40 on the end face 17 of the valve seat body 16 in the installed state. With each step 37 located further downstream in the perforated disk carrier 21, the diameter of the insertable perforated disk 26 is reduced, while the thickness d of the perforated disks 26 increases with each step 37 in accordance with the axial distances of the steps 37 from the end face 17.
  • Thicknesses d of perforated disks 26 of 0.075 mm to 0.3 mm are also conceivable in this exemplary embodiment; however, according to the specified gradations in the perforated disk carrier 21.
  • the distance between the first step 37 and the end face 17 is, for example, 0.1 mm, a perforated disk 26 with a thickness d of z. B. 0.105 mm or 0.11 mm.
  • the circumferential surfaces 39 run parallel to the longitudinal valve axis 2. The individual perforated disks 26 therefore differ in their axial thickness d and their diameter.
  • FIG. 6 shows a perforated disk carrier 21 in plan view, which differs from the ones shown so far in that it has square, especially also square perforated disks 26 can be used.
  • the ring section 19 Due to the square-shaped carrier section 25, the ring section 19 is no longer circular, but is characterized on the outside by a circular and on the inside by a square-shaped boundary. However, it fulfills the same functions as hitherto, since its tight fit on the end face 17 of the valve seat body 16 enables the tight weld seam 23 to be applied in a ring shape.
  • the carrier sections 25 can also be designed to accommodate square perforated disks 26.
  • a truncated pyramid-shaped taper (not shown) can now be provided, while corresponding to the circular steps 37, square steps 37 (FIG. 6) are now implemented.
  • the square-shaped perforated disks 26 are varied analogously to the possibilities described with the circular perforated disks 26 which are shown in FIGS. 4 and 5.
  • the circular through opening 36 shown in FIG. 6 can also have a square cross section.
  • FIG. 7 shows a perforated disk 26 on which means for unambiguous Position fixation and anti-rotation are provided. Two possibilities are indicated in the same figure on the perforated disk 26.
  • the perforated disk 26 has a notch-like groove 42, in which an axially bead-like elevation of the support section 25 can engage, while on the left side of the perforated disk 26, as another variant, a z. B. axially extending elevation 43 is provided, which can penetrate into a groove of the support portion 25.
  • d is understood to mean the thickness of the perforated disk 26 at least in the area of the clamping in the step section of the support section 25 and d' represents the thickness of the perforated disk 26 in the region of the spray openings 27.
  • the carrier section 25 in the base part 20 of the perforated disc carrier 21 is produced, for example, by shaping the frustoconical or truncated pyramid-shaped taper 34 or the step structure 37 by one or more embossing processes, the perforated disc carrier 21 having to be clamped in a corresponding tool for this purpose. With the same tool z. B. the through opening 36 can be introduced by means of a punch.
  • the perforated disk carrier 21 is only fixed to the valve seat body 16 with the weld seam 23 when the perforated disk 26 selected in accordance with the requirements is inserted in the cup-shaped carrier section 25 of the perforated disk carrier 21. There is therefore no fixed connection between valve seat body 16 and perforated disk 26.

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

Abstract

The fuel injection valve has a longitudinal axis, a valve closure body, a valve seat body (16) with a valve seat surface which works in conjunction with the closure body and a thin hole plate (26) with at least one ejection opening downstream of the valve seat surface. A holed disc carrier (21) is partially in contact with a lower end (17) of the valve seat body and is rigidly connected to the valve seat body. The holed disc carrier has an inner, bowl-shaped carrier extending at an axial distance from the lower end of the valve seat body. The greatest axial separation is formed between a base section of the carrier section (25) and the end and the holed disc is inserted between the end and the carrier section.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs. Es ist bereits ein Brennstoffeinspritzventil aus der DE-OS 38 41 142 bekannt, bei dem eine Lochscheibe an einem Ventilsitzkörper mittels einer umlaufenden Schweißnaht befestigt ist. Dabei muß die Schweißnaht weit weg von den Abspritzöffnungen liegen, um Verformungen der dünnen Lochscheibe zu vermeiden. Die relativ dicke Lochscheibe ist napfförmig ausgebildet, um ein Abheben der Lochscheibe aufgrund des herrschenden Brennstoffdruckes zu verhindern, wodurch sich in ungewollter Weise das Strahlbild des abgespritzten Brennstoffs ändert. Der Aufwand für die Herstellung und Montage der Lochscheibe ist sehr groß.The invention relates to a fuel injector according to the preamble of the main claim. A fuel injector is already known from DE-OS 38 41 142, in which a perforated disk is fastened to a valve seat body by means of a circumferential weld seam. The weld seam must be far away from the spray openings to avoid deformation of the thin perforated disc. The relatively thick perforated disk is cup-shaped in order to prevent the perforated disk from lifting off due to the prevailing fuel pressure, as a result of which the spray pattern of the sprayed fuel changes in an undesired manner. The effort for the manufacture and assembly of the perforated disc is very large.

Außerdem ist schon aus der DE-OS 41 23 692 ein Brennstoffeinspritzventil bekannt, bei dem eine dünnere Lochscheibe verwendet wird, die wiederum von einer dickeren, stromabwärts der Lochscheibe folgenden Stützscheibe, die eine zentrale Durchgangsöffnung aufweist, abgestützt wird. Bei der Befestigung der Lochscheibe wird so ein unerwünschtes Durchbiegen derselben verhindert. Die Stützscheibe ist topfförmig ausgeführt und zusammen mit der Lochscheibe mittels einer umlaufenden Schweißnaht an den Ventilsitzkörper angeschweißt. Der Stützscheibe kommt hauptsächlich die Funktion der Stabilitätsverbesserung der Lochscheibe zu, und sie ist jeweils mit einer Lochscheibe fest verbunden.In addition, a fuel injector is already known from DE-OS 41 23 692, in which a thinner perforated disk is used, which in turn is supported by a thicker support disk downstream of the perforated disk, which has a central through opening. When attaching the perforated disc, undesired bending of the same is prevented. The support disc is pot-shaped and together with the Perforated disc welded to the valve seat body by means of a circumferential weld seam. The supporting disk mainly has the function of improving the stability of the perforated disk, and it is firmly connected to a perforated disk.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß in einfacher und kostengünstiger Weise eine sehr gute Variation in der Verwendung von Lochscheiben mit unterschiedlichen Abmessungen, insbesondere unterschiedlicher Dicke und Durchmesser, möglich ist, wodurch mit sehr geringem Aufwand die Durchflußmengen der Lochscheiben einfach variiert werden können und auch verschiedene Strahlbilder erzeugbar sind. Dies wird erfindungsgemäß dadurch erreicht, daß ein Lochscheibenträger stromabwärts einer Ventilsitzfläche vorgesehen ist, der einen derart geformten Trägerabschnitt aufweist, daß eine Vielzahl von Lochscheiben mit unterschiedlichen Abmessungen in einfacher Form in ihn einsetzbar ist.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that a very good variation in the use of perforated disks with different dimensions, in particular different thickness and diameter, is possible in a simple and inexpensive manner, whereby the flow rates of the perforated disks with very little effort can be easily varied and different beam patterns can also be generated. This is achieved according to the invention in that a perforated disk carrier is provided downstream of a valve seat surface and has a carrier section shaped in such a way that a plurality of perforated disks with different dimensions can be inserted into it in a simple form.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the subclaims allow advantageous developments and improvements of the fuel injector specified in the main claim.

Besonders vorteilhaft ist es, den Lochscheibenträger topfförmig auszubilden und dessen umlaufenden Halterand nach der Einstellung des Ventilsitzkörpers in seiner axialen Lage mit einem Ventilsitzträger dicht und fest zu verbinden, so daß hierdurch die Einstellung des Ventilhubes möglich ist. Von Vorteil ist es zudem, das Bodenteil des Lochscheibenträgers napfförmig auszubilden, um genau in diesem napfförmigen Trägerabschnitt eine Lochscheibe aufzunehmen. In vorteilhafter Weise ist dieser Trägerabschnitt entweder kegelstumpfförmig bzw. pyramidenstumpfförmig oder mit mehreren axial aufeinanderfolgenden Stufenabschnitten ausgebildet.It is particularly advantageous to design the perforated disk carrier in a pot-shaped manner and to connect its circumferential retaining edge in a tight and firm manner with a valve seat carrier in its axial position after the setting of the valve seat body, so that this makes it possible to adjust the valve stroke. It is also advantageous to design the bottom part of the perforated disc carrier in a cup-shaped manner in order to be precisely in this cup-shaped support section to receive a perforated disc. Advantageously, this support section is either frustoconical or truncated pyramid-shaped or with a plurality of axially successive step sections.

Vorteilhaft ist es ebenfalls, wenn im Trägerabschnitt des Lochscheibenträgers Mittel wie Nuten oder wulstähnliche Erhebungen, vorgesehen sind, durch deren Zusammenwirken mit an der Lochscheibe entsprechend entgegengesetzten Mitteln definierte Einbaulagen garantiert sind und für eine Verdrehsicherung gesorgt ist.It is also advantageous if means, such as grooves or bead-like elevations, are provided in the carrier section of the perforated disk carrier, through their interaction with appropriately opposed means on the perforated disk correspondingly defined installation positions are guaranteed and an anti-rotation device is provided.

Durch die Verwendung eines Lochscheibenträgers können Lochscheiben mit vergleichsweise kleinen Abmessungen eingesetzt werden, so daß in vorteilhafter Weise Material für die Lochscheiben gespart werden kann.By using a perforated disc carrier, perforated discs with comparatively small dimensions can be used, so that material for the perforated discs can be saved in an advantageous manner.

Ein besonderer Vorteil ist auch dadurch gegeben, daß die einzubauende Lochscheibe weder mit dem Ventilsitzkörper noch mit dem Lochscheibenträger fest verbunden ist, so daß ein Schweißverzug der Lochscheibe oder andere sich durch die herkömmlichen Fügeverfahren ergebenden Nachteile völlig ausgeschlossen sind. Nun liegt eine vollständige Trennung der Funktionen von Befestigung (Lochscheibenträger) und Zumessung (Lochscheibe) an den verschiedenen Bauteilen vor. Aufgrund des vorgegebenen Lochscheibenträgers ist es möglich, für die verschiedenen einsetzbaren Lochscheiben immer den gleichen Hubeinstellungsvorgang durchzuführen. Die Durchflußstreuungen können so sehr gering gehalten werden.A particular advantage is also given by the fact that the perforated disk to be installed is not firmly connected to the valve seat body or to the perforated disk carrier, so that welding distortion of the perforated disk or other disadvantages resulting from the conventional joining process are completely eliminated. There is now a complete separation of the functions of fastening (perforated disc carrier) and metering (perforated disc) on the various components. Due to the specified perforated disc carrier, it is always possible to carry out the same stroke adjustment process for the various perforated discs that can be used. The flow scatter can be kept very low.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes Einspritzventil, Figur 2 einen Lochscheibenträger mit konischem Trägerabschnitt, Figur 3 einen Lochscheibenträger mit gestuftem Trägerabschnitt, Figur 4 Lochscheiben für den Lochscheibenträger nach Figur 2, Figur 5 Lochscheiben für den Lochscheibenträger nach Figur 3, Figur 6 eine Draufsicht auf einen Lochscheibenträger für viereckige Lochscheiben, Figuren 7 und 8 Beispiele von Lochscheiben mit Mitteln zum definierten Einbau und Figur 9 eine Lochscheibe mit Bereichen unterschiedlicher Dicke.Embodiments of the invention are shown in simplified form in the drawing and in the following Description explained in more detail. FIG. 1 shows a partially illustrated injection valve, FIG. 2 shows a perforated disk carrier with a conical carrier section, FIG. 3 shows a perforated disk carrier with stepped carrier section, FIG. 4 perforated disks for the perforated disk carrier according to FIG. 2, FIG. 5 perforated disks for the perforated disk carrier according to FIG. 3, and FIG. 6 shows a plan view a perforated disc carrier for square perforated discs, Figures 7 and 8 examples of perforated discs with means for defined installation and Figure 9 is a perforated disc with areas of different thickness.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist als ein Ausführungsbeispiel ein Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise dargestellt. Das Einspritzventil hat einen rohrförmigen Ventilsitzträger 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 z. B. kugelförmigen Ventilschließkörper 7, an dessen Umfang beispielsweise fünf Abflachungen 8 vorgesehen sind, verbunden ist. Die Abflachungen 8 am Ventilschließkörper 7 ermöglichen einen Brennstofffluß in Richtung einer Ventilsitzfläche 9.1 shows, as an exemplary embodiment, a valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines. The injection valve has a tubular valve 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. tubular valve needle 5 arranged at its downstream end 6 with a z. B. spherical valve closing body 7, on the circumference of which, for example, five flats 8 are provided, is connected. The flats 8 on the valve closing body 7 allow fuel to flow in the direction of a valve seat surface 9.

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

Zur Führung des Ventilschließkörpers 7 während der Axialbewegung dient eine Führungsöffnung 15 eines Ventilsitzkörpers 16. In dem stromabwärts liegenden, dem Kern 11 abgewandten Ende des Ventilsitzträgers 1 ist in der konzentrisch zur Ventillängsachse 2 verlaufenden Längsöffnung 3 der zylinderförmige Ventilsitzkörper 16 angeordnet. Der Umfang des Ventilsitzkörpers 16 weist einen geringfügig kleineren Durchmesser auf als den Durchmesser der Längsöffnung 3 des Ventilsitzträgers 1. An seiner einen, dem Ventilschließkörper 7 abgewandten, unteren Stirnseite 17 ist der Ventilsitzkörper 16 mit einem äußeren Ringabschnitt 19 eines Bodenteils 20 eines erfindungsgemäßen, von der Dicke her scheibenförmigen Lochscheibenträgers 21 konzentrisch und fest verbunden, so daß das Bodenteil 20 mit seiner oberen Stirnseite 22 im Bereich des Ringabschnitts 19 an der unteren Stirnseite 17 des Ventilsitzkörpers 16 anliegt.A guide opening 15 of a valve seat body 16 is used to guide the valve closing body 7 during the axial movement. In the downstream end of the valve seat carrier 1 facing away from the core 11, the cylindrical valve seat body 16 is arranged in the longitudinal opening 3 concentric to the longitudinal axis 2 of the valve. The circumference of the valve seat body 16 has a slightly smaller diameter than the diameter of the longitudinal opening 3 of the valve seat carrier 1. On its one lower end face 17 facing away from the valve closing body 7, the valve seat body 16 is provided with an outer ring portion 19 of a bottom part 20 of an inventive one, of which Thick disc-shaped perforated disc carrier 21 concentrically and firmly connected, so that the bottom part 20 rests with its upper end face 22 in the region of the ring portion 19 on the lower end face 17 of the valve seat body 16.

Die Verbindung von Ventilsitzkörper 16 und z. B. topfförmig ausgebildetem Lochscheibenträger 21 erfolgt beispielsweise durch eine umlaufende und dichte, mittels eines Lasers ausgebildete erste Schweißnaht 23, die sich zwangsläufig ringförmig an dem Ringabschnitt 19 erstreckt. Das Bodenteil 20 weist neben dem äußeren Ringabschnitt 19 einen napfförmigen, tiefer liegenden und mit axialem Abstand zur unteren Stirnseite 17 des Ventilsitzkörpers 16 verlaufenden Trägerabschnitt 25 auf, in den eine Lochscheibe 26 eingesetzt ist. In der Lochscheibe 26 befinden sich wenigstens eine, beispielsweise vier durch Stanzen oder Erodieren ausgeformte Anspritzöffnungen 27. Durch die Art der Montage mit dem Anbringen der Schweißnaht 23 im Ringabschnitt 19 des Lochscheibenträgers 21 ist die Gefahr einer unerwünschten Verformung des Bodenteils 20 in seinem inneren Trägerabschnitt 25 und damit auch der Lochscheibe 26 vollständig vermieden.The connection of valve seat body 16 and z. B. cup-shaped perforated disc carrier 21 is carried out, for example, by a circumferential and tight, by means of a laser-formed first weld 23, which necessarily extends annularly on the ring portion 19. In addition to the outer ring section 19, the base part 20 has a cup-shaped, lower-lying support section 25, which extends at an axial distance from the lower end face 17 of the valve seat body 16 and into which a perforated disk 26 is inserted. There are at least one, for example four, injection openings 27 formed by punching or eroding in the perforated disk 26. Due to the type of assembly with the attachment of the weld seam 23 Ring section 19 of the perforated disk carrier 21, the risk of undesired deformation of the base part 20 in its inner carrier section 25 and thus also the perforated disk 26 is completely avoided.

An das Bodenteil 20 des beispielsweise topfförmigen Lochscheibenträgers 21 schließt sich nach außen ein umlaufender Halterand 28 an, der sich in axialer Richtung dem Ventilsitzkörper 16 abgewandt erstreckt und bis zu seinem Ende hin konisch nach außen gebogen ist. Der Halterand 28 übt eine radiale Federwirkung auf die Wandung der Längsöffnung 3 aus. Dadurch wird beim Einschieben des aus Ventilsitzkörper 16, Lochscheibe 26 und Lochscheibenträger 21 bestehenden Ventilsitzteils in die Längsöffnung 3 des Ventilsitzträgers 1 eine Spanbildung am Ventilsitzteil und an der Längsöffnung 3 vermieden. Der Halterand 28 des Lochscheibenträgers 21 ist an seinem freien Ende mit der Wandung der Längsöffnung 3 beispielsweise durch eine umlaufende und dichte zweite Schweißnaht 30 verbunden.At the bottom part 20 of the cup-shaped perforated disc carrier 21, for example, adjoins to the outside a circumferential retaining edge 28 which extends in the axial direction away from the valve seat body 16 and is conically bent outwards to the end thereof. The holding edge 28 exerts a radial spring action on the wall of the longitudinal opening 3. This prevents chip formation on the valve seat part and on the longitudinal opening 3 when the valve seat part consisting of valve seat body 16, perforated disk 26 and perforated disk carrier 21 is inserted into the longitudinal opening 3 of the valve seat carrier 1. The holding edge 28 of the perforated disc carrier 21 is connected at its free end to the wall of the longitudinal opening 3, for example by a circumferential and tight second weld seam 30.

Eine dichte Verschweißung von Ventilsitzkörper 16 und Lochscheibenträger 21 sowie von Lochscheibenträger 21 und Ventilsitzträger 1 ist erforderlich, damit das verwendete Medium, beispielsweise ein Brennstoff, nicht zwischen der Längsöffnung 3 des Ventilsitzträgers 1 und dem Umfang des Ventilsitzkörpers 16 hindurch oder zwischen der Längsöffnung 3 des Ventilsitzträgers 1 und dem Halterand 28 des Lochscheibenträgers 21 hindurch unmittelbar in eine Ansaugleitung der Brennkraftmaschine strömen kann.A tight weld of valve seat body 16 and perforated disk carrier 21 and of perforated disk carrier 21 and valve seat carrier 1 is required so that the medium used, for example a fuel, does not pass between the longitudinal opening 3 of the valve seat carrier 1 and the circumference of the valve seat body 16 or between the longitudinal opening 3 of the valve seat carrier 1 and the holding edge 28 of the perforated disc carrier 21 can flow directly into an intake line of the internal combustion engine.

Die Einschubtiefe des aus Ventilsitzkörper 16, Lochscheibe 26 und Lochscheibenträger 21 bestehenden Ventilsitzteils in die Längsöffnung 3 bestimmt die Größe des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließkörpers 7 an der Ventilsitzfläche 9 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar.The insertion depth of the valve seat part consisting of valve seat body 16, perforated disk 26 and perforated disk carrier 21 into the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the solenoid 10 is not excited due to the application of the Valve closing body 7 is fixed to the valve seat surface 9 of the valve seat body 16. 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 thus represents the stroke.

Der kugelförmige Ventilschließkörper 7 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 9 des Ventilsitzkörpers 16 zusammen, die in axialer Richtung zwischen der Führungsöffnung 15 und der unteren Stirnseite 17 des Ventilsitzkörpers 16 ausgebildet ist.The spherical valve closing body 7 interacts with the valve seat surface 9 of the valve seat body 16 which tapers in the shape of a truncated cone, which is formed in the axial direction between the guide opening 15 and the lower end face 17 of the valve seat body 16.

Am Umfang des Ventilsitzträgers 1 ist an seinem stromabwärtigen, der Magnetspule 10 abgewandten Ende eine Schutzkappe 32 angeordnet und mittels beispielsweise einer Rastverbindung mit dem Ventilsitzträger 1 verbunden. Ein Dichtring 33 dient zur Abdichtung zwischen dem Umfang des Einspritzventils und einer nicht dargestellten Ventilaufnahme, beispielsweise der Ansaugleitung der Brennkraftmaschine.A protective cap 32 is arranged on the circumference of the valve seat support 1 at its downstream end facing away from the solenoid 10 and is connected to the valve seat support 1 by means of, for example, a snap-in connection. A sealing ring 33 serves to seal between the circumference of the injection valve and a valve receptacle, not shown, for example the intake line of the internal combustion engine.

In den Figuren 2 und 3 sind zwei Ausführungsbeispiele der erfindungsgemäßen Lochscheibenträger 21 zusammen mit dem Ventilsitzkörper 16 im Ventilsitzträger 1 dargestellt, wobei hauptsächlich die Lage der Bauteile zueinander sowie die Form des Lochscheibenträgers 21 verdeutlicht werden sollen, weshalb auf die Lochscheiben 26 und die Schweißnähte 23, 30 in den Figuren verzichtet wird. Bei dem ersten Ausführungsbeispiel des Lochscheibenträgers 21 in den Figuren 1 und 2 ist der napfförmige Trägerabschnitt 25 des Bodenteils 20 weitgehend konisch bzw. kegelstumpfförmig ausgeführt. Vom Ringabschnitt 19 des Bodenteils 20 ausgehend erstreckt sich das Bodenteil 20 radial nicht weiter an der unteren Stirnseite 17 des Ventilsitzkörpers 16 anliegend, sondern auch mit einer axialen Komponente, so daß eine kegelstumpfförmige Verjüngung 34 des Trägerabschnitts 25 in der Ventilsitzfläche 9 abgewandter Richtung vorliegt. In einem axialen Abstand von rund 0,2 bis 0,3 mm von der Stirnseite 17 endet die kegelstumpfförmige Verjüngung 34 des Trägerabschnitts 25. An diese konische Verjüngung 34 des Trägerabschnitts 25 schließt sich nun zur Ventillängsachse 2 hin wieder ein ebener, radial verlaufender, parallel zum Ringabschnitt 19 und senkrecht zur Ventillängsachse 2 ausgebildeter Bodenabschnitt 35 an, in dem beispielsweise mittig eine kreisförmige, elliptische oder auch viereckige Durchgangsöffnung 36 eingebracht ist. Durch diese Durchgangsöffnung 36 tritt letztlich der aus der zumessenden Lochscheibe 26 abgespritzte Brennstoff aus.FIGS. 2 and 3 show two exemplary embodiments of the perforated disk carrier 21 according to the invention together with the valve seat body 16 in the valve seat carrier 1, the position of the components relative to one another and the shape of the perforated disk carrier 21 mainly being explained, which is why the perforated disks 26 and the weld seams 23, 30 is dispensed with in the figures. In the first embodiment of the perforated disc carrier 21 in FIGS. 1 and 2, the cup-shaped carrier section 25 of the base part 20 is largely conical or frustoconical. Starting from the ring section 19 of the base part 20, the base part 20 does not extend further radially on the lower end face 17 of the valve seat body 16, but also with an axial component, so that there is a frustoconical taper 34 of the support section 25 in the direction away from the valve seat surface 9. The frusto-conical taper 34 of the carrier section 25 ends at an axial distance of approximately 0.2 to 0.3 mm from the end face 17. This conical taper 34 of the carrier section 25 is then joined to the longitudinal axis of the valve again by a flat, radially running, parallel to the ring section 19 and perpendicular to the longitudinal axis 2 of the bottom section 35, in which, for example, a circular, elliptical or square passage opening 36 is introduced in the center. The fuel sprayed out of the perforated disk 26 to be metered ultimately emerges through this through opening 36.

Der Lochscheibenträger 21 in der Figur 3 unterscheidet sich von dem in der Figur 2 dargestellten nur in der Ausbildung des Trägerabschnitts 25. An seiner inneren, der Stirnseite 17 des Ventilsitzkörpers 16 zugewandten Seite ist die Verjüngung 34 des Trägerabschnitts 25 nicht konisch ausgeführt, sondern stufenförmig. Die einzelnen Stufen 37 des Trägerabschnitts 25 sind dabei z.B. so ausgebildet, daß sich die jeweiligen kreisförmigen Stufenabschnitte von der Stirnseite 17 ausgehend bis zum Bodenabschnitt 35 hin regelmäßig in ihrem Durchmesser verkleinern. Damit ist gemeint, daß sowohl die axiale Erstreckung jeder Stufe 37 als auch das Maß der Verringerung des Durchmessers von einer Stufe 37 zur nächsten Stufe 37 jeweils für sich konstant sein sollen. Typischerweise sind in dem Trägerabschnitt 25 drei (Figur 3) oder vier Stufen 37 vorgesehen; eine andere Anzahl an Stufen 37 ist jedoch jederzeit realisierbar. Bei einer Ausbildung des Trägerabschnitts 25 mit vier Stufen 37 bietet sich z. B. die folgende Abstufung an: 0,1 mm; 0,15 mm; 0,2 mm; 0,25 mm, wobei mit diesen Angaben jeweils die axialen Abstände einer jeden Stufe 37 bis zur Stirnseite 17 des Ventilsitzkörpers 16 gemeint sind. Entsprechend den vier Stufen 37 können folglich vier verschieden groß ausgebildete Lochscheiben 26 in dem trotz der Stufen 37 von der Tendenz her napfförmigen Trägerabschnitt 25 eingesetzt werden. In dem Bodenabschnitt 35 des Trägerabschnitts 25 ist wiederum eine Durchgangsöffnung 36 vorgesehen.The perforated disk carrier 21 in FIG. 3 differs from that shown in FIG. 2 only in the design of the carrier section 25. On its inner side facing the end face 17 of the valve seat body 16, the taper 34 of the carrier section 25 is not conical, but rather step-like. The individual steps 37 of the support section 25 are designed, for example, in such a way that the respective circular step sections regularly decrease in diameter from the end face 17 to the bottom section 35. This means that both the axial extent of each step 37 and the extent of the reduction in diameter from one step 37 to the next step 37 should be constant. Typically, three (Figure 3) or four steps 37 are provided in the carrier section 25; however, a different number of stages 37 can be implemented at any time. In a training of the support section 25 with four stages 37 z. For example, the following gradation: 0.1 mm; 0.15 mm; 0.2 mm; 0.25 mm, with this information each the axial distances of each step 37 to the end face 17 of the valve seat body 16 are meant. Corresponding to the four stages 37, four perforated disks 26 of different sizes can consequently be used in the carrier section 25 which tends to be cup-shaped despite the stages 37. A through opening 36 is again provided in the bottom section 35 of the support section 25.

Die Figur 4 verdeutlicht die Form der Lochscheiben 26, die für den Einsatz bei Lochscheibenträgern 21 nach den Figuren 1 und 2 besonders geeignet sind. Entsprechend der konischen Ausbildung des Trägerabschnitts 25 weisen auch die Lochscheiben 26 eine konische Umfangsfläche 39 als äußere radiale Begrenzung auf, die die gleiche Neigung wie die kegelstumpfförmige Verjüngung 34 des Lochscheibenträgers 21 besitzt. Die Umfangsflächen 39 der Lochscheiben 26 liegen also im eingebauten Zustand vollständig an der konischen Fläche der Verjüngung 34 an. Außerdem weist eine obere, der Ventilsitzfläche 9 zugewandte Stirnfläche 40 der Lochscheibe 26 jeweils einen solch großen Durchmesser auf, wie der größte freie, durch den Ringabschnitt 19 umgebene Durchmesser des Trägerabschnitts 25 unmittelbar an der Stirnseite 17 des Ventilsitzkörpers 16, so daß die Lochscheibe 26 mit ihrer Stirnfläche 40 immer an der Stirnseite 17 anliegt. Die verschiedenen, in den Trägerabschnitten 25 des Lochscheibenträgers 21 einsetzbaren Lochscheiben 26 unterscheiden sich demzufolge in ihrer axialen Dicke d und damit auch in der Größe der konischen Umfangsfläche 39 sowie in ihrem Durchmesser der der oberen Stirnfläche 40 gegenüberliegenden unteren Stirnfläche 41. Entsprechend dem axialen Abstand vom Bodenabschnitt 35 zur Stirnseite 17 können Lochscheiben 26 z. B. mit Dicken d von 0,075 mm bis 0,3 mm in feinsten Dickenabstufungen zum Einsatz kommen. Die beispielsweise vier Abspritzöffnungen 27 befinden sich z. B. symmetrisch um die Ventillängsachse 2 in Form von Eckpunkten eines Quadrates verteilt und besitzen damit jeweils den gleichen Abstand zueinander und zur Ventillängsachse 2.FIG. 4 illustrates the shape of the perforated disks 26, which are particularly suitable for use with perforated disk carriers 21 according to FIGS. 1 and 2. Corresponding to the conical design of the carrier section 25, the perforated disks 26 also have a conical peripheral surface 39 as an outer radial boundary, which has the same inclination as the frustoconical taper 34 of the perforated disk carrier 21. In the installed state, the peripheral surfaces 39 of the perforated disks 26 lie completely against the conical surface of the taper 34. In addition, an upper end face 40 of the perforated disk 26 facing the valve seat surface 9 has such a large diameter as the largest free diameter of the carrier section 25 surrounded by the ring section 19 directly on the end face 17 of the valve seat body 16, so that the perforated disk 26 also its end face 40 always abuts the end face 17. The various perforated disks 26 which can be used in the carrier sections 25 of the perforated disk carrier 21 consequently differ in their axial thickness d and thus also in the size of the conical peripheral surface 39 and in their diameter of the lower end face 41 opposite the upper end face 40. Corresponding to the axial distance from Bottom section 35 to the end face 17 can perforated disks 26 z. B. with thicknesses d of 0.075 mm to 0.3 mm in the finest thickness gradations are used. The four spray orifices 27, for example, are located e.g. B. symmetrical about the valve longitudinal axis 2 in Distributed shape of corner points of a square and thus have the same distance to each other and to the valve longitudinal axis 2.

Die in der Figur 5 gezeigten Lochscheiben 26 eignen sich besonders zum Einsatz in Lochscheibenträgern 21 mit gestuftem Trägerabschnitt 25, wie in der Figur 3 gezeigt. Auch diese Lochscheiben 26 weisen wiederum solche Abmessungen auf, daß sie im eingebauten Zustand stets mit ihrer oberen Stirnfläche 40 an der Stirnseite 17 des Ventilsitzkörpers 16 anliegen. Mit jeder weiter stromabwärts liegenden Stufe 37 im Lochscheibenträger 21 verringert sich also der Durchmesser der einbaubaren Lochscheibe 26, während die Dicke d der Lochscheiben 26 mit jeder Stufe 37 entsprechend den axialen Abständen der Stufen 37 zur Stirnseite 17 größer wird. Auch bei diesem Ausführungsbeispiel sind Dicken d der Lochscheiben 26 von 0,075 mm bis 0,3 mm denkbar; jedoch entsprechend den vorgegebenen Abstufungen im Lochscheibenträger 21. Um eine vor dem Verrutschen vollständig sichere Klemmung der Lochscheibe 26 im Trägerabschnitt 25 des Lochscheibenträgers 21 zu gewährleisten, ist es sinnvoll, den axialen Abstand einer Stufe 37 zur Stirnseite 17 minimal kleiner vorzusehen als die Dicke d der einzusetzenden Lochscheibe 26. Beträgt der Abstand der ersten Stufe 37 zur Stirnseite 17 beispielsweise 0,1 mm, so bietet sich eine Lochscheibe 26 mit einer Dicke d von z. B. 0,105 mm oder 0,11 mm an. Bei den Lochscheiben 26 nach Figur 5 verlaufen die Umfangsflächen 39 parallel zur Ventillängsachse 2. Die einzelnen Lochscheiben 26 unterscheiden sich also in ihrer axialen Dicke d und ihrem Durchmesser.The perforated disks 26 shown in FIG. 5 are particularly suitable for use in perforated disk carriers 21 with a stepped carrier section 25, as shown in FIG. 3. These perforated disks 26 in turn have dimensions such that they always rest with their upper end face 40 on the end face 17 of the valve seat body 16 in the installed state. With each step 37 located further downstream in the perforated disk carrier 21, the diameter of the insertable perforated disk 26 is reduced, while the thickness d of the perforated disks 26 increases with each step 37 in accordance with the axial distances of the steps 37 from the end face 17. Thicknesses d of perforated disks 26 of 0.075 mm to 0.3 mm are also conceivable in this exemplary embodiment; however, according to the specified gradations in the perforated disk carrier 21. In order to ensure that the perforated disk 26 is completely securely clamped in the carrier section 25 of the perforated disk carrier 21 before it slips, it is expedient to provide the axial distance between a step 37 and the end face 17 to be minimally smaller than the thickness d Perforated disk to be used 26. If the distance between the first step 37 and the end face 17 is, for example, 0.1 mm, a perforated disk 26 with a thickness d of z. B. 0.105 mm or 0.11 mm. In the case of the perforated disks 26 according to FIG. 5, the circumferential surfaces 39 run parallel to the longitudinal valve axis 2. The individual perforated disks 26 therefore differ in their axial thickness d and their diameter.

In der Figur 6 ist ein Lochscheibenträger 21 in der Draufsicht dargestellt, der sich von den bisher gezeigten dadurch unterscheidet, daß in ihn viereckige, speziell auch quadratische Lochscheiben 26 einsetzbar sind. Der Ringabschnitt 19 ist nun aufgrund des viereckförmigen Trägerabschnitts 25 nicht mehr kreisringförmig ausgebildet, sondern zeichnet sich außen durch eine kreisförmige und innen durch eine viereckförmige Begrenzung aus. Er erfüllt jedoch die gleichen Funktionen wie bisher, da durch sein Anliegen an der Stirnseite 17 des Ventilsitzkörpers 16 die dichte Schweißnaht 23 ringförmig angebracht werden kann. Ähnlich den kegelstumpfförmigen und gestuften Trägerabschnitten 25 der Lochscheibenträger 21 in den Figuren 1 bis 3 können die Trägerabschnitte 25 auch für die Aufnahme von viereckförmigen Lochscheiben 26 ausgebildet sein. Anstelle der kegelstumpfförmigen Verjüngung 34 kann nun eine pyramidenstumpfförmige Verjüngung (nicht gezeigt) vorgesehen sein, während entsprechend den kreisförmigen Stufen 37 nun viereckförmige Stufen 37 (Figur 6) ausgeführt sind. Die Variation der viereckförmigen Lochscheiben 26 erfolgt analog den beschriebenen Möglichkeiten mit den kreisförmigen Lochscheiben 26, die in den Figuren 4 und 5 dargestellt sind. Die in der Figur 6 gezeigte kreisförmige Durchgangsöffnung 36 kann durchaus auch einen viereckigen Querschnitt besitzen.FIG. 6 shows a perforated disk carrier 21 in plan view, which differs from the ones shown so far in that it has square, especially also square perforated disks 26 can be used. Due to the square-shaped carrier section 25, the ring section 19 is no longer circular, but is characterized on the outside by a circular and on the inside by a square-shaped boundary. However, it fulfills the same functions as hitherto, since its tight fit on the end face 17 of the valve seat body 16 enables the tight weld seam 23 to be applied in a ring shape. Similar to the frustoconical and stepped carrier sections 25 of the perforated disk carriers 21 in FIGS. 1 to 3, the carrier sections 25 can also be designed to accommodate square perforated disks 26. Instead of the frustoconical taper 34, a truncated pyramid-shaped taper (not shown) can now be provided, while corresponding to the circular steps 37, square steps 37 (FIG. 6) are now implemented. The square-shaped perforated disks 26 are varied analogously to the possibilities described with the circular perforated disks 26 which are shown in FIGS. 4 and 5. The circular through opening 36 shown in FIG. 6 can also have a square cross section.

Um eine eindeutige Einbaulage der Lochscheibe 26 im Trägerabschnitt 25 des Lochscheibenträgers 21 zu garantieren, ist es zweckmäßig, eine viereckförmige Lochscheibe 26 mit einer einen Radius aufweisenden Umfangsfläche 39' vorzusehen (Figur 7), die dann in einen entsprechend ausgeformten Stufenabschnitt des Trägerabschnitts 25 genau eingepaßt wird. Umgekehrt sind auch kreisförmige Lochscheiben 26 denkbar, die an einer Stelle eine Abflachung aufweisen, die dann mit einer eben solchen Abflachung im Trägerabschnitt 25 zusammenwirkt und somit einen definierten Einbau ermöglicht. Auch die Figur 8 zeigt eine Lochscheibe 26, an der Mittel zur eindeutigen Lagefixierung und Verdrehsicherung vorgesehen sind. Dabei sind gleich zwei Möglichkeiten in ein und derselben Figur an der Lochscheibe 26 angedeutet. Auf der rechten Hälfte besitzt die Lochscheibe 26 eine kerbenähnliche Nut 42, in die eine axialwulstähnliche Erhebung des Trägerabschnitts 25 eingreifen kann, während auf der linken Seite der Lochscheibe 26 als eine andere Variante eine z. B. axial verlaufende Erhebung 43 vorgesehen ist, die in eine Nut des Trägerabschnitts 25 eindringen kann. Weitere Variationsmöglichkeiten ergeben sich, wie in Figur 9 gezeigt, durch Bereiche unterschiedlicher Dicke d, d' an ein und derselben Lochscheibe 26, wobei mit d die Dicke der Lochscheibe 26 zumindest im Bereich des Einklemmens im Stufenabschnitt des Trägerabschnitts 25 verstanden werden soll und d' die Dicke der Lochscheibe 26 im Bereich der Abspritzöffnungen 27 darstellt.In order to guarantee a clear installation position of the perforated disk 26 in the carrier section 25 of the perforated disk carrier 21, it is expedient to provide a square-shaped perforated disk 26 with a circumferential surface 39 'having a radius (FIG. 7), which then fits exactly into a correspondingly shaped step section of the carrier section 25 becomes. Conversely, circular perforated disks 26 are also conceivable, which have a flattening at one point, which then interacts with such a flattening in the carrier section 25 and thus enables a defined installation. FIG. 8 also shows a perforated disk 26 on which means for unambiguous Position fixation and anti-rotation are provided. Two possibilities are indicated in the same figure on the perforated disk 26. On the right half, the perforated disk 26 has a notch-like groove 42, in which an axially bead-like elevation of the support section 25 can engage, while on the left side of the perforated disk 26, as another variant, a z. B. axially extending elevation 43 is provided, which can penetrate into a groove of the support portion 25. As shown in FIG. 9, further variation possibilities result from areas of different thicknesses d, d 'on one and the same perforated disk 26, with d being understood to mean the thickness of the perforated disk 26 at least in the area of the clamping in the step section of the support section 25 and d' represents the thickness of the perforated disk 26 in the region of the spray openings 27.

Die Herstellung des Trägerabschnitts 25 im Bodenteil 20 des Lochscheibenträgers 21 mit dem Ausformen der kegelstumpfförmigen bzw. pyramidenstumpfförmigen Verjüngung 34 bzw. der Stufenstruktur 37 erfolgt beispielsweise durch einen oder mehrere Prägevorgänge, wobei der Lochscheibenträger 21 dazu in einem entsprechenden Werkzeug eingespannt sein muß. Mit dem gleichen Werkzeug kann z. B. auch die Durchgangsöffnung 36 mittels eines Stanzstempels eingebracht werden. Die Fixierung des Lochscheibenträgers 21 an dem Ventilsitzkörper 16 mit der Schweißnaht 23 erfolgt erst dann, wenn die den Erfordernissen entsprechend ausgewählte Lochscheibe 26 im napfförmigen Trägerabschnitt 25 des Lochscheibenträgers 21 eingesetzt ist. Es liegt damit keine feste Verbindung von Ventilsitzkörper 16 und Lochscheibe 26 vor.The carrier section 25 in the base part 20 of the perforated disc carrier 21 is produced, for example, by shaping the frustoconical or truncated pyramid-shaped taper 34 or the step structure 37 by one or more embossing processes, the perforated disc carrier 21 having to be clamped in a corresponding tool for this purpose. With the same tool z. B. the through opening 36 can be introduced by means of a punch. The perforated disk carrier 21 is only fixed to the valve seat body 16 with the weld seam 23 when the perforated disk 26 selected in accordance with the requirements is inserted in the cup-shaped carrier section 25 of the perforated disk carrier 21. There is therefore no fixed connection between valve seat body 16 and perforated disk 26.

Claims (8)

Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen, mit einer Ventillängsachse, mit einem Ventilschließkörper, mit einem Ventilsitzkörper, der eine mit dem Ventilschließkörper zusammenwirkende Ventilsitzfläche aufweist, mit einer stromabwärts der Ventilsitzfläche angeordneten, wenigstens eine Aspritzöffnung aufweisenden dünnen Lochscheibe, dadurch gekennzeichnet, daß an einer unteren Stirnseite (17) des Ventilsitzkörpers (16) ein Lochscheibenträger (21) teilweise anliegt und mit dem Ventilsitzkörper (16) fest verbunden ist, daß der Lochscheibenträger (21) einen inneren, napfförmigen Trägerabschnitt (25) besitzt, der sich mit axialem Abstand von der unteren Stirnseite (17) des Ventilsitzkörpers (16) erstreckt, wobei der größte axiale Abstand zwischen einem Bodenabschnitt (35) des Trägerabschnitts (25) und der Stirnseite (17) gebildet ist, und zwischen der Stirnseite (17) und dem Trägerabschnitt (25) die Lochscheibe (26) eingesetzt ist.Fuel injection valve for fuel injection systems of internal combustion engines, with a longitudinal valve axis, with a valve closing body, with a valve seat body, which has a valve seat surface interacting with the valve closing body, with a thin perforated disk which is arranged downstream of the valve seat surface and has at least one injection opening, characterized in that on a lower end face ( 17) of the valve seat body (16), a perforated disk carrier (21) partially abuts and is firmly connected to the valve seat body (16), that the perforated disk carrier (21) has an inner, cup-shaped carrier section (25), which is located at an axial distance from the lower end face (17) of the valve seat body (16), the greatest axial distance being formed between a bottom section (35) of the support section (25) and the end face (17), and between the end face (17) and the support section (25) the perforated disk (26) used i st. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß der Lochscheibenträger (21) topfförmig ausgebildet ist und einen umlaufenden Halterand (28) aufweist, der sich in axialer Richtung dem Ventilsitzkörper (16) abgewandt erstreckt und an seinem freien Ende mit der inneren Wandung eines Ventilsitzträgers (1) dicht verbunden ist.Fuel injection valve according to Claim 1, characterized in that the perforated disc carrier (21) is cup-shaped is formed and has a circumferential retaining edge (28) which extends in the axial direction facing away from the valve seat body (16) and is tightly connected at its free end to the inner wall of a valve seat support (1). Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Lochscheibenträger (21) mit einem Ringabschnitt (19) ausgebildet ist, mit dem der Lochscheibenträger (21) am Ventilsitzkörper (16) anliegt und der den inneren Trägerabschnitt (25) vollständig umgibt, wobei vom Ringabschnitt (19) ausgehend der Trägerabschnitt (25) mit einer kegelstumpfförmigen bzw. pyramidenstumpfförmigen Verjüngung (34) versehen ist, die am Bodenabschnitt (35) endet.Fuel injection valve according to Claim 1 or 2, characterized in that the perforated disk carrier (21) is formed with an annular section (19) with which the perforated disk carrier (21) bears against the valve seat body (16) and which completely surrounds the inner carrier section (25), wherein starting from the ring section (19), the carrier section (25) is provided with a truncated cone-shaped or truncated pyramid-shaped taper (34) which ends at the bottom section (35). Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Lochscheibenträger (21) mit einem Ringabschnitt (19) ausgebildet ist, mit dem der Lochscheibenträger (21) am Ventilsitzkörper (16) anliegt und der den inneren Trägerabschnitt (25) vollständig umgibt, wobei vom Ringabschnitt (19) ausgehend bis zum einen axialen Abstand zur Stirnseite (17) des Ventilsitzkörpers (16) aufweisenden Bodenabschnitt (35) an der der Stirnseite (17) zugewandten inneren Seite einer Verjüngung (34) des Lochscheibenträgers (21) Stufen (37) vorgesehen sind.Fuel injection valve according to Claim 1 or 2, characterized in that the perforated disk carrier (21) is formed with an annular section (19) with which the perforated disk carrier (21) bears against the valve seat body (16) and which completely surrounds the inner carrier section (25), wherein starting from the ring section (19) up to an axial distance from the end face (17) of the valve seat body (16) having a bottom section (35) on the inner side of the tapered end (17) facing a taper (34) of the perforated disc carrier (21) steps (37) are provided. Brennstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß die in dem Trägerabschnitt (25) des Lochscheibenträgers (21) einsetzbaren Lochscheiben (26) entsprechend der Neigung des Trägerabschnitts (25) Umfangsflächen (39) haben, die die gleiche Neigung besitzen.Fuel injection valve according to Claim 3, characterized in that the perforated disks (26) which can be inserted in the carrier section (25) of the perforated disk carrier (21) have circumferential surfaces (39) which have the same inclination, in accordance with the inclination of the carrier section (25). Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß an dem Lochscheibenträger (21) und an der Lochscheibe (26) einander zugeordnete Mittel (39', 42, 43) zur gegenseitigen Verdrehsicherung vorgesehen sind.Fuel injection valve according to claim 1, characterized in that on the perforated disc carrier (21) and on means (39 ', 42, 43) associated with the perforated disk (26) are provided for the purpose of securing each other against rotation. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß die axiale Erstreckung jeder einzelnen Stufe (37) im Trägerabschnitt (25) des Lochscheibenträgers (21) konstant ist.Fuel injection valve according to Claim 4, characterized in that the axial extent of each individual step (37) in the carrier section (25) of the perforated disc carrier (21) is constant. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß im montierten Zustand die Lochscheibe (26) zwischen dem Trägerabschnitt (25) des Lochscheibenträgers (21) und dem Ventilsitzkörper (16) eingeklemmt ist und an der Stirnseite (17) des Ventilsitzkörpers (16) anliegt.Fuel injection valve according to Claim 1, characterized in that, in the assembled state, the perforated disc (26) is clamped between the carrier section (25) of the perforated disc carrier (21) and the valve seat body (16) and bears against the end face (17) of the valve seat body (16).
EP95114024A 1994-12-23 1995-09-07 Fuel injection valve Withdrawn EP0718490A3 (en)

Applications Claiming Priority (2)

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DE4446241A DE4446241A1 (en) 1994-12-23 1994-12-23 Fuel injector
DE4446241 1994-12-23

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EP0718490A2 true EP0718490A2 (en) 1996-06-26
EP0718490A3 EP0718490A3 (en) 1997-10-01

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JP (1) JP3811206B2 (en)
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Also Published As

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JP3811206B2 (en) 2006-08-16
BR9505987A (en) 1997-12-23
EP0718490A3 (en) 1997-10-01
JPH08218982A (en) 1996-08-27
US5718387A (en) 1998-02-17
DE4446241A1 (en) 1996-06-27

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