EP0937202A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP0937202A1
EP0937202A1 EP98940057A EP98940057A EP0937202A1 EP 0937202 A1 EP0937202 A1 EP 0937202A1 EP 98940057 A EP98940057 A EP 98940057A EP 98940057 A EP98940057 A EP 98940057A EP 0937202 A1 EP0937202 A1 EP 0937202A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
sealing
sealing elements
plastic encapsulation
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.)
Granted
Application number
EP98940057A
Other languages
German (de)
French (fr)
Other versions
EP0937202B1 (en
Inventor
Dieter Maier
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 EP0937202A1 publication Critical patent/EP0937202A1/en
Application granted granted Critical
Publication of EP0937202B1 publication Critical patent/EP0937202B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • Numerous fuel injection valves are already known, for example from EP-PS 0 348 786 or from DE-OS 40 08 118, which have a plurality of sealing rings on their outer peripheries, which are usually designed as O-rings.
  • the geometrical arrangement or the position of the sealing rings which represent independent components and are to be assembled separately depends on the installation conditions on the internal combustion engine or the embodiments of the valves, which can be designed, for example, as top feed injectors or bottom feed injectors.
  • the desired sealing with the sealing rings takes place against an intake manifold, a cylinder head or receiving sleeves or a fuel rail, a distribution line or the like.
  • the sealing rings are placed on the fuel injector in specially designed installation spaces, such as ring grooves, on the valve housing, on the nozzle body, on front bodies or on the plastic encapsulation.
  • installation spaces such as ring grooves, on the valve housing, on the nozzle body, on front bodies or on the plastic encapsulation.
  • DE-OS 195 12 339 it is already known to provide hose-like sealing elements on fuel injection valves with plastic encapsulation, which are present at the ends of the plastic encapsulation directly on metal parts of the valve.
  • the sealing elements surround the respective metallic part of the valve completely radially and are at least partially radially surrounded by the plastic encapsulation.
  • Fuel injection valve to the outside for example with respect to a fuel rail, a distribution line or an intake manifold or a cylinder head, is guaranteed. Sealing is carried out by sealing elements according to the invention, which are generated in a plastic injection molding tool before or together with or after the plastic injection molding of the fuel injector. With such a tool, e.g. advantageously after the plastic injection molding of the valve jacket, a second injection process, in which the sealing elements on the
  • Plastic extrusion molded on that at least one flat contact area is formed.
  • a material connection is present in the contact areas of the sealing material of the sealing element with the plastic of the plastic extrusion coating.
  • a one-sided flat contact can be achieved at one end of the plastic encapsulation, a two-sided flat contact at a step section of the plastic encapsulation and a three-sided flat contact in ring grooves on the outer circumference of the plastic encapsulation.
  • the thicknesses and widths (axial extension lengths) of the sealing elements can be varied slightly.
  • a large variety of shapes is easy to produce, with curved, rounded or flat outer contours and contours provided with sealing lips or sealing ribs being useful.
  • FIG. 1 shows a fuel injector with various sealing elements
  • FIG. 2 shows a sealing element with several sealing lips however, it is only shown as a separate component for better illustration of the geometry.
  • the fuel injection valve according to the invention for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines shown by way of example and partially in simplified form in FIG.
  • the base body 2 is designed with multiple steps and largely constitutes a valve housing of the fuel injector.
  • the solenoid 1 is composed of at least one, for example two, guide elements designed as brackets and serving as ferromagnetic elements or guide elements 6 surround. Each guide element 6 partially surrounds the magnetic coil 1 in the circumferential direction and can be connected to the base body 2 by welding, soldering or gluing with one end each above and below the magnetic coil 1.
  • the base body 2 has an inner longitudinal opening 11, which runs concentrically to a longitudinal valve axis 10 and serves as a fuel flow channel in an upstream region 11a and additionally at least partially as a guide opening for a valve needle 12 axially movable along the longitudinal valve axis 10 in a downstream region 11b.
  • the area 11b has a larger diameter than the area 11a, since a step shoulder 13 is provided in the longitudinal opening 11 in the axial extension area of the magnet coil 1.
  • the base body 2 has a thin-walled magnetic throttle point 16.
  • a valve seat body 14 is introduced, which has a fixed valve seat surface 15 as the valve seat.
  • the valve seat body 14 is fixedly connected to the base body 2 by means of a weld seam, for example produced by means of a laser.
  • the lower region 11b of the longitudinal opening 11 serves to receive the valve needle 12, which is formed by an armature 17 and a spherical valve closing body 18.
  • a flat spray perforated disk 20 is arranged on the downstream end face of the valve seat body 14.
  • the armature 17 serving as a closing body support is firmly connected at its downstream end facing the spraying orifice plate 20 to the spherical valve closing body 18, for example by a weld seam.
  • the injection valve is actuated electromagnetically in a known manner.
  • the electromagnetic circuit with the magnet coil 1, the inner base body 2, the guide elements 6 and the armature 17 is used.
  • the armature 17 is corresponding to the Step paragraph 13 of the base body 2 aligned.
  • the return spring 25 extends in the longitudinal opening 11, for example, both downstream and upstream of the stepped shoulder 13, that is to say in both regions 11a and 11b.
  • the spherical valve closing body 18 interacts with the valve seat surface 15 of the valve seat body 14 which tapers in the shape of a truncated cone and which in the axial direction is downstream of a guide opening in the Valve seat body 14 is formed.
  • the spray plate 20 has at least one, for example four, spray openings 27 formed by erosion or stamping.
  • Injection valve is, among other things, decisive for the stroke of the valve needle 12.
  • the one end position of the valve needle 12 when the magnet coil 1 is not energized is determined by the valve closing body 18 resting on the valve seat surface 15 of the valve seat body 14, while the other end position of the valve needle 12 is established when the valve needle 12 is energized Magnetic coil 1 results from the system of the armature 17 on the step shoulder 13 of the base body 2.
  • the stroke is adjusted by axially displacing the valve seat body 14 in accordance with the desired one
  • an adjusting sleeve 29 is inserted into the upper region 11a of the longitudinal opening 11.
  • Adjusting sleeve 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting sleeve 29, which is supported with its opposite side on a bottom region 30 of an inner recess 31 in the armature 17, the dynamic injection quantity also being adjusted using the adjusting sleeve 29.
  • At least one through opening 35 is formed in the armature 17, for example two or four through openings 35 are formed, which extend obliquely to the valve axis 10 to the outside.
  • the armature 17 tapers in the downstream direction, the outer contour being frustoconical. This design of the armature 17 enables that of the valve seat surface 15
  • the fuel to be supplied can first flow freely through the recess 31 inside and after exiting the through openings 35 outside the valve needle 12.
  • the fuel injector is largely with a
  • Plastic encapsulation 38 enclosed, which extends almost completely in the axial direction over the base body 2 and thereby also the guide elements 6.
  • This plastic encapsulation 38 includes, for example, an injection-molded electrical connector 39, in which e.g. two contact pins 40 starting from the magnetic coil 1 end. The electrical contacting of the magnetic coil 1 and thus the excitation thereof takes place via the electrical connector 39.
  • sealing elements 45, 45a-d connected to the plastic encapsulation 38 are provided on the outer circumference of the fuel injector do not represent seal components that can be assembled independently. Rather, these sealing elements 45 occur before or immediately during or after the attachment of the
  • Plastic injection molded 38 A two-substance spraying technique is necessary for such a procedure.
  • a particularly preferred procedure is described in more detail below.
  • a second injection process is carried out with the same tool, in which the sealing elements 45 are produced.
  • the plastic injection molding in Plastic injection mold removed at the locations of the sealing elements 45 to be produced slide.
  • the plastic encapsulation 38 must already have a certain stability and shape retention, the plastic still having such a softness that an optimal material connection with the material of the desired sealing elements 45 takes place.
  • Various types of rubber (elastomers) or elastic plastics as are known, for example, from O-rings or other sealing rings on injection valves, are particularly suitable as materials for the sealing elements 45.
  • a very flexible shape and spatial arrangement can be made in the formation of the sealing elements 45 by means of injection molding.
  • FIG. 1 several examples relating to the shape and arrangement of the sealing elements 45 are shown on the fuel injector, which are identified by additional letters from a to d. Only a single sealing element 45 can be provided on the fuel injection valve; however, several sealing elements 45 molded on according to the invention can also be present on one and the same fuel injector. This can be varied depending on the installation conditions.
  • the sealing element 45a on the inlet-side upper end of the plastic encapsulation 38 is injection-molded, for example, in such a way that, on the one hand, it lies directly against the base body 2 with a flat inside 47 and, on the other hand, is available with a curved outside 48 for sealing against another component (for example fuel rail).
  • the sealing element 45a also has direct surface contact with an upper end face 52 of the plastic encapsulation 38.
  • Another injection variant of the sealing element 45 is shown at the injection-side end of the plastic encapsulation 38, in which the sealing element 45d is sprayed directly onto the plastic encapsulation 38, specifically in a step section 55 provided for this purpose.
  • Sealing element 45d now lies with the flat inner side 47 against the plastic encapsulation 38, while the at least partially curved outer side 48 is ready for sealing against another component (e.g. suction pipe). With a flat, flat upper side 50, the sealing element 45d also lies directly against a shoulder 56 of the step section 55 of the plastic encapsulation 38. In contrast to the sealing element 45a, the sealing element 45d thus has two contact surfaces with the plastic encapsulation 38.
  • sealing element 45 Two further variants for the formation of a sealing element 45 on the circumference of the fuel injection valve and in this case specifically on the circumference of the plastic encapsulation 38 are shown with the sealing elements 45b and 45c.
  • 38 annular grooves 58 are provided in the plastic encapsulation, into which the sealing elements 45b and 45c are injected. These annular grooves 58 are located in the middle part of the axial extension of the plastic encapsulation 38, e.g. in the
  • Extension area of the magnetic coil 1 or the adjusting sleeve 29 At least on the groove base of the ring grooves 58 there is a flat, cohesive contact of the inner sides 47 of the sealing elements 45 with the plastic encapsulation 38.
  • the outer sides 48 of the sealing elements 45 can be curved
  • sealing element 45b or rather flat with rounded edges (sealing element 45c) or completely flat.
  • the thicknesses and the widths (axial extension lengths) of the sealing elements 45 can be varied slightly.
  • the arrangement of such middle sealing elements 45b and 45c results in the advantage of a very large variability in the installation position with one and the same fuel injection valve. Without changes in
  • Valve group (e.g. on the base body 2 or on the valve needle 12), for example, can be used at any time with a valve of this type to provide a further injection point, if necessary, by moving the valve further into the intake manifold.
  • the suction pipe-side seal is then taken over by the sealing element 45c, for example, instead of the sealing element 45d. Since the sealing elements 45 can be formed very easily with different thicknesses, it is possible to use different sealing elements 45b, 45c, 45d for sealing against the opening despite different valve outer diameters (e.g. largest diameter in the area of the solenoid coil 1, smallest diameter in the area of the valve closing body 18) a suction pipe socket with a constant diameter.
  • the sealing elements 45 can also have contours other than those shown in FIG. 1.
  • a plurality of sealing lips 60 or sealing ribs can be provided on the outer sides 48 of the sealing elements 45, as can be seen from the sealing element 45 shown in FIG. 2.
  • the individual sealing lips 60 run around the outer circumference of the sealing element 45, for example in a ring.
  • the sealing element 45 is shown as a separate component separated from the plastic encapsulation 38 only for better verification of its geometry, but according to the invention is not present as an independently mountable sealing component.

Abstract

The invention relates to a fuel injection valve, comprising a valve housing (2) and a plastic extrusion coat (38) which at least partly surrounds the valve housing (2). The invention provides for sealing elements (45) on the outer circumference of the fuel injection valve for sealing said fuel injection valve in relation to a fuel rail, suction pipe or such like. Each of the sealing elements (45) is at least partly in level contact with the surface of the plastic extrusion coat (38). Said sealing elements (45) are injected against the plastic extrusion coat (38) or injected into recesses (55, 58) of said plastic extrusion coat (38). The fuel injection valve is especially suited for use in fuel injection systems of mixture-compressing spark-ignited internal combustion engines.

Description

BrennstoffeinspritzventilFuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injector according to the preamble of the main claim.
Bekannt sind bereits zahlreiche Brennstoffeinspritzventile, so beispielsweise aus der EP-PS 0 348 786 oder aus der DE-OS 40 08 118, die an ihren äußeren Umfangen mehrere Dichtringe, die meist als O-Ringe ausgeführt sind, aufweisen. Die geometrische Anordnung bzw. die Lage der eigenständige Bauteile darstellenden und separat zu montierenden Dichtringe ist abhängig von den Einbaubedingungen an der Brennkraftmaschine bzw. den Ausführungsformen der Ventile, die z.B. als Top-Feed-Injektoren oder Bottom-Feed-Injektoren ausgebildet sein können. Bei diesen bekannten Brennstoffeinspritzventilen erfolgt die mit den Dichtringen gewünschte Abdichtung gegenüber einem Saugrohr, einem Zylinderkopf oder Aufnahmehülsen bzw. einem Fuel Rail, einer Verteilerleitung oder ähnlichem. Die Dichtringe werden an dem Brennstoffeinspritzventil in speziell dafür vorgesehenen Einbauräumen, wie z.B. Ringnuten, am Ventilgehäuse, am Düsenkörper, an Vorsatzkörpern oder an der Kunststoffumspritzung eingebracht . Aus der DE-OS 195 12 339 ist bereits bekannt, an Brennstoffeinspritzventilen mit Kunststoffumspritzung schlauchähnliche Dichtelemente vorzusehen, die an den Enden der Kunststoffumspritzung unmittelbar an metallenen Teilen des Ventils vorliegen. Die Dichtelemente umgeben dabei das jeweilige metallene Teil des Ventils vollständig radial und werden zumindest teilweise selbst radial von der Kunststoffumspritzung umgeben.Numerous fuel injection valves are already known, for example from EP-PS 0 348 786 or from DE-OS 40 08 118, which have a plurality of sealing rings on their outer peripheries, which are usually designed as O-rings. The geometrical arrangement or the position of the sealing rings which represent independent components and are to be assembled separately depends on the installation conditions on the internal combustion engine or the embodiments of the valves, which can be designed, for example, as top feed injectors or bottom feed injectors. In these known fuel injection valves, the desired sealing with the sealing rings takes place against an intake manifold, a cylinder head or receiving sleeves or a fuel rail, a distribution line or the like. The sealing rings are placed on the fuel injector in specially designed installation spaces, such as ring grooves, on the valve housing, on the nozzle body, on front bodies or on the plastic encapsulation. From DE-OS 195 12 339 it is already known to provide hose-like sealing elements on fuel injection valves with plastic encapsulation, which are present at the ends of the plastic encapsulation directly on metal parts of the valve. The sealing elements surround the respective metallic part of the valve completely radially and are at least partially radially surrounded by the plastic encapsulation.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß auf einfache Art und Weise eine kostengünstige und sichere sowie effektiv herstellbare Abdichtung desThe fuel injector according to the invention with the characterizing features of the main claim has the advantage that an inexpensive and safe and effectively producible seal of the
Brennstoffeinspritzventils nach außen hin, beispielsweise gegenüber einem Fuel Rail, einer Verteilerleitung bzw. einem Saugrohr oder einem Zylinderkopf, gewährleistet ist. Die Abdichtung erfolgt durch erfindungsgemäße Dichtelemente, die in einem Kunststoffspritzgießwerkzeug zeitlich vor oder zusammen mit oder zeitlich nach der Kunststoffumspritzung des Brennstoffeinspritzventils erzeugt werden. Mit einem solchen Werkzeug erfolgt z.B. in vorteilhafter Weise nach dem KunststoffSpritzguß des Ventilmantels ein zweiter Spritzvorgang, bei dem die Dichtelemente so an derFuel injection valve to the outside, for example with respect to a fuel rail, a distribution line or an intake manifold or a cylinder head, is guaranteed. Sealing is carried out by sealing elements according to the invention, which are generated in a plastic injection molding tool before or together with or after the plastic injection molding of the fuel injector. With such a tool, e.g. advantageously after the plastic injection molding of the valve jacket, a second injection process, in which the sealing elements on the
Kunststoffumspritzung angeformt werden, daß wenigstens ein flächiger Kontaktbereich gebildet ist . In den Kontaktbereichen des Dichtmaterials des Dichtelements mit dem Kunststoff der Kunststoffumspritzung liegt ein StoffSchluß vor. In besonders vorteilhafter Weise kann bei der Ausbildung der Dichtelemente mittels Anspritzen eine sehr flexible Formgestaltung und räumliche Anordnung vorgenommen werden. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Wei erbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.Plastic extrusion molded on that at least one flat contact area is formed. A material connection is present in the contact areas of the sealing material of the sealing element with the plastic of the plastic extrusion coating. In a particularly advantageous manner, a very flexible design and spatial arrangement can be carried out when the sealing elements are formed by means of injection molding. The measures listed in the subclaims allow advantageous developments and improvements of the fuel injector specified in the main claim.
Von Vorteil ist es, daß auf sehr einfache Art und Weise variiert werden kann, mit wieviel Seiten das Dichtelement flächigen Kontakt mit der Kunststoffumspritzung haben soll. An einem Ende der Kunststoffumspritzung ist so ein einseitiger flächiger Kontakt, an einem Stufenabschnitt der Kunststoffumspritzung ein zweiseitiger flächiger Kontakt und in Ringnuten am äußeren Umfang der Kunststoffumspritzung ein dreiseitiger flächiger Kontakt erzielbar.It is advantageous that it can be varied in a very simple manner with how many sides the sealing element should have surface contact with the plastic encapsulation. A one-sided flat contact can be achieved at one end of the plastic encapsulation, a two-sided flat contact at a step section of the plastic encapsulation and a three-sided flat contact in ring grooves on the outer circumference of the plastic encapsulation.
Mit der Anordnung von Dichtelementen in mittleren axialen Bereichen des Brennstoffeinspritzventils ergibt sich der Vorteil einer sehr großen Variabilität der Einbaulage mit ein und demselben Ventil .The arrangement of sealing elements in central axial areas of the fuel injector results in the advantage of a very large variability of the installation position with one and the same valve.
In vorteilhaf er Weise sind die Dicken und Breiten (axiale Erstreckungslängen) der Dichtelemente leicht variierbar. Außerdem ist eine große Formenvielfalt einfach herstellbar, wobei gewölbte, abgerundete oder flache Außenkonturen sowie mit Dichtlippen oder Dichtrippen versehene Konturen zweckmäßig sind.In an advantageous manner, the thicknesses and widths (axial extension lengths) of the sealing elements can be varied slightly. In addition, a large variety of shapes is easy to produce, with curved, rounded or flat outer contours and contours provided with sealing lips or sealing ribs being useful.
Zeichnungdrawing
Ausführungsbeispiele von Dichtelementen an einem erfindungsgemäßen Brennstoffeinspritzventil sind in derEmbodiments of sealing elements on a fuel injector according to the invention are in the
Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert . Es zeigen Figur 1 ein Brennstoffeinspritzventil mit verschiedenen Dichtelementen und Figur 2 ein Dichtelement mit mehreren Dichtlippen, das jedoch nur zur besseren Veranschaulichung der Geometrie als separates Bauteil dargestellt ist.Drawing shown in simplified form and explained in more detail in the following description. FIG. 1 shows a fuel injector with various sealing elements and FIG. 2 shows a sealing element with several sealing lips however, it is only shown as a separate component for better illustration of the geometry.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Das in der Figur 1 beispielhaft und teilweise vereinfacht dargestellte, erfindungsgemäße Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen hat einen einteiligen, von einer Magnetspule 1 umgebenen, als Innenpol und alsThe fuel injection valve according to the invention for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines, shown by way of example and partially in simplified form in FIG
Brennstoffeinlaß bzw. -durchfluß sowie als Ventilsitzträger dienenden weitgehend rohrförmigen metallenen Grundkörper 2. Der Grundkörper 2 ist mehrfach gestuft ausgeführt und stellt weitgehend ein Ventilgehäuse des Brennstoffeinspritzventils dar. Die Magnetspule 1 ist von wenigstens einem, beispielsweise zwei als Bügel ausgebildeten und als ferromagnetische Elemente dienenden Leitelement bzw. Leitelementen 6 umgeben. Jedes Leitelement 6 umgibt die Magnetspule 1 in Umfangsrichtung teilweise sowie ist mit jeweils einem Ende oberhalb und unterhalb der Magnetspule 1 an dem Grundkörper 2 durch Schweißen, Löten oder Kleben verbindbar .Fuel inlet or flow as well as largely tubular metal base body 2 serving as a valve seat support. The base body 2 is designed with multiple steps and largely constitutes a valve housing of the fuel injector. The solenoid 1 is composed of at least one, for example two, guide elements designed as brackets and serving as ferromagnetic elements or guide elements 6 surround. Each guide element 6 partially surrounds the magnetic coil 1 in the circumferential direction and can be connected to the base body 2 by welding, soldering or gluing with one end each above and below the magnetic coil 1.
Der Grundkörper 2 besitzt eine innere, konzentrisch zu einer Ventillängsachse 10 verlaufende Längsöffnung 11, die in einem stromaufwärtigen Bereich 11a als BrennstoffStrömungskanal und in einem stromabwärtigen Bereich 11b noch zusätzlich wenigstens teilweise als Führungsöffnung für eine entlang der Ventillängsachse 10 axial bewegliche Ventilnadel 12 dient. Der Bereich 11b weist einen größeren Durchmesser auf als der Bereich 11a, da im axialen Erstreckungsbereich der Magnetspule 1 ein Stufenabsatz 13 in der Längsöffnung 11 vorgesehen ist. Unmittelbar stromabwärts des Stufenabsatzes 13 folgend besitzt der Grundkörper 2 eine dünnwandige magnetische Drosselstelle 16.The base body 2 has an inner longitudinal opening 11, which runs concentrically to a longitudinal valve axis 10 and serves as a fuel flow channel in an upstream region 11a and additionally at least partially as a guide opening for a valve needle 12 axially movable along the longitudinal valve axis 10 in a downstream region 11b. The area 11b has a larger diameter than the area 11a, since a step shoulder 13 is provided in the longitudinal opening 11 in the axial extension area of the magnet coil 1. Immediately following the step 13 the base body 2 has a thin-walled magnetic throttle point 16.
Am stromabwärtigen Ende des Bereichs 11b der Längsöffnung 11 des als Ventilsitzträger dienenden Grundkörpers 2 ist ein Ventilsitzkörper 14 eingebracht, der eine feste Ventilsitzfläche 15 als Ventilsitz aufweist. Der Ventilsitzkörper 14 ist mit einer beispielsweise mittels eines Lasers erzeugten Schweißnaht fest mit dem Grundkörper 2 verbunden. Ansonsten dient der untere Bereich 11b der Längsöffnung 11 der Aufnahme der Ventilnadel 12, die von einem Anker 17 und einem kugelförmigen Ventilschließkörper 18 gebildet wird. An der stromabwärtigen Stirnseite des Ventilsitzkörpers 14 ist eine flache Spritzlochscheibe 20 angeordnet. Der als Schließkörperträger dienende Anker 17 ist an seinem stromabwärtigen, der Spritzlochscheibe 20 zugewandten Ende mit dem kugelförmigen Ventilschließkörper 18 beispielsweise durch eine Schweißnaht fest verbunden.At the downstream end of the region 11b of the longitudinal opening 11 of the base body 2 serving as the valve seat support, a valve seat body 14 is introduced, which has a fixed valve seat surface 15 as the valve seat. The valve seat body 14 is fixedly connected to the base body 2 by means of a weld seam, for example produced by means of a laser. Otherwise, the lower region 11b of the longitudinal opening 11 serves to receive the valve needle 12, which is formed by an armature 17 and a spherical valve closing body 18. A flat spray perforated disk 20 is arranged on the downstream end face of the valve seat body 14. The armature 17 serving as a closing body support is firmly connected at its downstream end facing the spraying orifice plate 20 to the spherical valve closing body 18, for example by a weld seam.
Die Betätigung des Einspritzventils erfolgt in bekannter Weise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 12 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 25 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem inneren Grundkörper 2, den Leitelementen 6 und dem Anker 17. Der Anker 17 ist entsprechend auf den Stufenabsatz 13 des Grundkörpers 2 ausgerichtet. Die Rückstellfeder 25 erstreckt sich in der Längsöffnung 11 beispielsweise sowohl stromabwärts als auch stromaufwärts des Stufenabsatzes 13 , also in beiden Bereichen 11a und 11b.The injection valve is actuated electromagnetically in a known manner. For the axial movement of the valve needle 12 and thus for opening against the spring force of a return spring 25 or closing the injection valve, the electromagnetic circuit with the magnet coil 1, the inner base body 2, the guide elements 6 and the armature 17 is used. The armature 17 is corresponding to the Step paragraph 13 of the base body 2 aligned. The return spring 25 extends in the longitudinal opening 11, for example, both downstream and upstream of the stepped shoulder 13, that is to say in both regions 11a and 11b.
Der kugelförmige Ventilschließkörper 18 wirkt mit der sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitzfläche 15 des Ventilsitzkörpers 14 zusammen, die in axialer Richtung stromabwärts einer Führungsöffnung im Ventilsitzkörper 14 ausgebildet ist. Die Spritzlochscheibe 20 besitzt wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 27.The spherical valve closing body 18 interacts with the valve seat surface 15 of the valve seat body 14 which tapers in the shape of a truncated cone and which in the axial direction is downstream of a guide opening in the Valve seat body 14 is formed. The spray plate 20 has at least one, for example four, spray openings 27 formed by erosion or stamping.
Die Einschubtiefe des Ventilsitzkörpers 14 imThe insertion depth of the valve seat body 14 in
Einspritzventil ist unter anderem entscheidend für den Hub der Ventilnadel 12. Dabei ist die eine Endstellung der Ventilnadel 12 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 18 an der Ventilsitzfläche 15 des Ventilsitzkörpers 14 festgelegt, während sich die andere Endstellung der Ventilnadel 12 bei erregter Magnetspule 1 durch die Anlage des Ankers 17 an dem Stufenabsatz 13 des Grundkörpers 2 ergibt. Die Hubeinstellung erfolgt durch ein axiales Verschieben des Ventilsitzkörpers 14, der entsprechend der gewünschtenInjection valve is, among other things, decisive for the stroke of the valve needle 12. The one end position of the valve needle 12 when the magnet coil 1 is not energized is determined by the valve closing body 18 resting on the valve seat surface 15 of the valve seat body 14, while the other end position of the valve needle 12 is established when the valve needle 12 is energized Magnetic coil 1 results from the system of the armature 17 on the step shoulder 13 of the base body 2. The stroke is adjusted by axially displacing the valve seat body 14 in accordance with the desired one
Position nachfolgend fest mit dem Grundkörper 2 verbunden wird.Position is then firmly connected to the base body 2.
In den oberen Bereich 11a der Längsöffnung 11 ist außer der Rückstellfeder 25 eine Einstellhülse 29 eingeschoben. DieIn addition to the return spring 25, an adjusting sleeve 29 is inserted into the upper region 11a of the longitudinal opening 11. The
Einstellhülse 29 dient zur Einstellung der Federvorspannung der an der Einstellhülse 29 anliegenden Rückstellfeder 25, die sich mit ihrer gegenüberliegenden Seite an einem Bodenbereich 30 einer inneren Vertiefung 31 im Anker 17 abstützt, wobei auch eine Einstellung der dynamischen Abspritzmenge mit der Einstellhülse 29 erfolgt.Adjusting sleeve 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting sleeve 29, which is supported with its opposite side on a bottom region 30 of an inner recess 31 in the armature 17, the dynamic injection quantity also being adjusted using the adjusting sleeve 29.
Vom Bodenbereich 30 der Vertiefung 31 ausgehend ist in dem Anker 17 mindestens eine Durchgangsöffnung 35, beispielsweise sind zwei oder vier Durchgangsöffnungen 35 ausgeformt, die sich schräg zur Ventilachse 10 nach außen erstrecken. Im Bereich der Durchgangsöffnungen 35 verjüngt sich der Anker 17 in Stromabwärtiger Richtung, wobei die Außenkontur kegelstumpfförmig ist. Diese Ausbildung des Ankers 17 ermöglicht es, daß der der Ventilsitzflache 15 zuzuführende Brennstoff zuerst durch die Vertiefung 31 innerhalb und nach dem Austritt aus den Durchgangsöffnungen 35 außerhalb der Ventilnadel 12 ungehindert strömen kann.Starting from the base region 30 of the recess 31, at least one through opening 35 is formed in the armature 17, for example two or four through openings 35 are formed, which extend obliquely to the valve axis 10 to the outside. In the area of the through openings 35, the armature 17 tapers in the downstream direction, the outer contour being frustoconical. This design of the armature 17 enables that of the valve seat surface 15 The fuel to be supplied can first flow freely through the recess 31 inside and after exiting the through openings 35 outside the valve needle 12.
Das Brennstoffeinspritzventil ist weitgehend mit einerThe fuel injector is largely with a
Kunststoffumspritzung 38 umschlossen, die sich in axialer Richtung fast vollständig über den Grundkörper 2 und dabei auch die Leitelemente 6 erstreckt . Zu dieser Kunststoffumspritzung 38 gehört beispielsweise ein mitangespritzter elektrischer Anschlußstecker 39, in dem z.B. zwei von der Magnetspule 1 ausgehende Kontaktpins 40 enden. Über den elektrischen Anschlußstecker 39 erfolgt die elektrische Kontaktierung der Magnetspule 1 und damit deren Erregung .Plastic encapsulation 38 enclosed, which extends almost completely in the axial direction over the base body 2 and thereby also the guide elements 6. This plastic encapsulation 38 includes, for example, an injection-molded electrical connector 39, in which e.g. two contact pins 40 starting from the magnetic coil 1 end. The electrical contacting of the magnetic coil 1 and thus the excitation thereof takes place via the electrical connector 39.
Zur Abdichtung des Brennstoffeinspritzventils zulaufseitig gegenüber einem Fuel Rail, einer Verteilerleitung oder ähnlichem bzw. abspritzseitig gegenüber einem Saugrohr, einem dort angeordneten Anschlußstutzen oder einem Zylinderkopf einer Brennkraftmaschine sind am äußeren Umfang des Brennstoffeinspritzventils mit der Kunststoffumspritzung 38 verbundene Dichtelemente 45, 45a-d vorgesehen, die keine eigenständig montierbaren Dichtungsbauteile darstellen. Vielmehr werden diese Dichtelemente 45 zeitlich vor oder unmittelbar beim oder nach dem Anbringen derTo seal the fuel injection valve on the inlet side against a fuel rail, a distribution line or the like or on the injection side against an intake manifold, a connecting piece arranged there or a cylinder head of an internal combustion engine, sealing elements 45, 45a-d connected to the plastic encapsulation 38 are provided on the outer circumference of the fuel injector do not represent seal components that can be assembled independently. Rather, these sealing elements 45 occur before or immediately during or after the attachment of the
Kunststoffumspritzung 38 mitangespritzt. Für eine solche Vorgehensweise ist eine Zweistoffspritztechnik nötig.Plastic injection molded 38. A two-substance spraying technique is necessary for such a procedure.
Eine besonders bevorzugte Verfahrensweise wird im folgenden näher beschrieben. Nachdem die Kunststoffumspritzung 38 in bekannter Weise mit Hilfe eines Kunststoffspritzgießwerk- zeugs auf dem metallenen Grundkörper 2 aufgebracht ist, wird mit demselben Werkzeug ein zweiter Spritzvorgang vorgenommen, bei dem die Dichtelemente 45 erzeugt werden. Dazu werden die beim KunststoffSpritzgießen im Kunststoffspritzgießwerkzeug an den Stellen der zu erzeugenden Dichtelemente 45 vorhandenen Schieber entfernt. Zum Zeitpunkt des zweiten Spritzvorgangs muß die Kunststoffumspritzung 38 bereits eine gewisse Stabilität und Formtreue aufweisen, wobei der Kunststoff noch eine solche Weichheit besitzt, daß ein optimaler StoffSchluß mit dem Material der gewünschten Dichtelemente 45 erfolgt. Als Materialien für die Dichtelemente 45 eignen sich besonders verschiedene Gummiarten (Elastomere) bzw. elastische Kunststoffe, wie sie z.B. bereits von O-Ringen oder anderen Dichtringen an Einspritzventilen bekannt sind. In besonders vorteilhafter Art und Weise kann bei der Ausbildung der Dichtelemente 45 mittels Anspritzen eine sehr flexible Formgestaltung und räumliche Anordnung vorgenommen werden.A particularly preferred procedure is described in more detail below. After the plastic encapsulation 38 has been applied to the metal base body 2 in a known manner with the aid of a plastic injection molding tool, a second injection process is carried out with the same tool, in which the sealing elements 45 are produced. For this, the plastic injection molding in Plastic injection mold removed at the locations of the sealing elements 45 to be produced slide. At the time of the second injection process, the plastic encapsulation 38 must already have a certain stability and shape retention, the plastic still having such a softness that an optimal material connection with the material of the desired sealing elements 45 takes place. Various types of rubber (elastomers) or elastic plastics, as are known, for example, from O-rings or other sealing rings on injection valves, are particularly suitable as materials for the sealing elements 45. In a particularly advantageous manner, a very flexible shape and spatial arrangement can be made in the formation of the sealing elements 45 by means of injection molding.
In der Figur 1 sind an dem Brennstoffeinspritzventil mehrere Beispiele bezüglich Formgebung und Anordnung der Dichtelemente 45 dargestellt, die mit zusätzlichen Buchstaben von a bis d gekennzeichnet sind. Es kann sowohl nur ein einzelnes Dichtelement 45 am Brennstoffeinspritzventil vorgesehen sein; es können aber auch mehrere erfindungsgemäß angeformte Dichtelemente 45 an ein und demselben Brennstoffeinspritzventil vorhanden sein. Entsprechend den Einbaubedingungen kann dies variiert werden. Das Dichtelement 45a am Zulaufseitigen oberen Ende der Kunststoffumspritzung 38 ist beispielsweise derart angespritzt, daß es einerseits mit einer ebenen Innenseite 47 unmittelbar am Grundkörper 2 anliegt und andererseits mit einer gewölbten Außenseite 48 zum Abdichten gegenüber einem anderen Bauteil (z.B. Fuel Rail) bereitsteht. Mit einer Unterseite 49 besitzt das Dichtelement 45a außerdem unmittelbar flächigen Kontakt zu einer oberen Stirnfläche 52 der Kunststoffumspritzung 38. Eine andere Anspritzvariante des Dichtelements 45 ist am abspritzseitigen Ende der Kunststoffumspritzung 38 dargestellt, bei der das Dichtelement 45d direkt auf die Kunststoffumspritzung 38, und zwar in einem dafür vorgesehenen Stufenabschnitt 55, aufgespritzt wird. DasIn FIG. 1, several examples relating to the shape and arrangement of the sealing elements 45 are shown on the fuel injector, which are identified by additional letters from a to d. Only a single sealing element 45 can be provided on the fuel injection valve; however, several sealing elements 45 molded on according to the invention can also be present on one and the same fuel injector. This can be varied depending on the installation conditions. The sealing element 45a on the inlet-side upper end of the plastic encapsulation 38 is injection-molded, for example, in such a way that, on the one hand, it lies directly against the base body 2 with a flat inside 47 and, on the other hand, is available with a curved outside 48 for sealing against another component (for example fuel rail). With an underside 49, the sealing element 45a also has direct surface contact with an upper end face 52 of the plastic encapsulation 38. Another injection variant of the sealing element 45 is shown at the injection-side end of the plastic encapsulation 38, in which the sealing element 45d is sprayed directly onto the plastic encapsulation 38, specifically in a step section 55 provided for this purpose. The
Dichtelement 45d liegt nun mit der ebenen Innenseite 47 an der Kunststoffumspritzung 38 an, während die zumindest teilweise gewölbte Außenseite 48 zum Abdichten gegenüber einem anderen Bauteil (z.B. Saugrohr) bereitsteht. Mit einer flachen, ebenen Oberseite 50 liegt das Dichtelement 45d außerdem unmittelbar an einer Schulter 56 des Stufenabschnitts 55 der Kunststoffumspritzung 38 an. Im Gegensatz zum Dichtelement 45a weist das Dichtelement 45d also zwei Kontaktflächen mit der Kunststoffumspritzung 38 auf .Sealing element 45d now lies with the flat inner side 47 against the plastic encapsulation 38, while the at least partially curved outer side 48 is ready for sealing against another component (e.g. suction pipe). With a flat, flat upper side 50, the sealing element 45d also lies directly against a shoulder 56 of the step section 55 of the plastic encapsulation 38. In contrast to the sealing element 45a, the sealing element 45d thus has two contact surfaces with the plastic encapsulation 38.
Zwei weitere Varianten für die Ausbildung eines Dichtelements 45 am Umfang des Brennstoffeinspritzventils und dabei speziell am Umfang der Kunststoffumspritzung 38 sind mit den Dichtelementen 45b und 45c dargestellt. Zur Aufnahme der Dichtelemente 45b und 45c sind in der Kunststoffumspritzung 38 Ringnuten 58 vorgesehen, in die die Dichtelemente 45b und 45c eingespritzt werden. Diese Ringnuten 58 befinden sich im mittleren Teil der axialen Erstreckung der Kunststoffumspritzung 38, so z.B. imTwo further variants for the formation of a sealing element 45 on the circumference of the fuel injection valve and in this case specifically on the circumference of the plastic encapsulation 38 are shown with the sealing elements 45b and 45c. To accommodate the sealing elements 45b and 45c, 38 annular grooves 58 are provided in the plastic encapsulation, into which the sealing elements 45b and 45c are injected. These annular grooves 58 are located in the middle part of the axial extension of the plastic encapsulation 38, e.g. in the
Erstreckungsbereich der Magnetspule 1 oder der Einstellhülse 29. Zumindest am Nutgrund der Ringnuten 58 liegt ein flächiger, Stoffschlüssiger Kontakt der Innenseiten 47 der Dichtelemente 45 mit der Kunststoffumspritzung 38 vor. Die Außenseiten 48 der Dichtelemente 45 können gewölbtExtension area of the magnetic coil 1 or the adjusting sleeve 29. At least on the groove base of the ring grooves 58 there is a flat, cohesive contact of the inner sides 47 of the sealing elements 45 with the plastic encapsulation 38. The outer sides 48 of the sealing elements 45 can be curved
(Dichtelement 45b) oder eher flach mit Abrundungen in den Randbereichen (Dichtelement 45c) oder vollständig flach ausgeführt sein. Wie die Figur 1 zeigt, sind die Dicken sowie die Breiten (axiale Erstreckungslängen) der Dichtelemente 45 leicht variierbar. Mit der Anordnung solcher mittlerer Dichtelemente 45b und 45c ergibt sich der Vorteil einer sehr großen Variabilität der Einbaulage mit ein und demselben Brennstoffeinspritzventil . Ohne Veränderungen der(Sealing element 45b) or rather flat with rounded edges (sealing element 45c) or completely flat. As FIG. 1 shows, the thicknesses and the widths (axial extension lengths) of the sealing elements 45 can be varied slightly. The arrangement of such middle sealing elements 45b and 45c results in the advantage of a very large variability in the installation position with one and the same fuel injection valve. Without changes in
Ventilgruppe (z.B. am Grundkörper 2 oder an der Ventilnadel 12) kann beispielsweise jederzeit mit einem solchen Ventil ein weiter vorgesetzter Abspritzpunkt bei Bedarf realisiert werden, indem das Ventil weiter in das Saugrohr hineinverschoben wird. Die saugrohrseitige Abdichtung wird dann beispielsweise anstelle des Dichtelements 45d vom Dichtelement 45c übernommen. Da die Dichtelemente 45 sehr einfach mit unterschiedlichen Dicken ausgebildet werden können, ist es möglich, trotz unterschiedlicher Ventilaußendurchmesser (z.B. größter Durchmesser im Bereich der Magnetspule 1, kleinster Durchmesser im Bereich des Ventilschließkörpers 18) verschiedene Dichtelemente 45b, 45c, 45d zur Abdichtung gegenüber der Öffnung eines SaugrohrStutzens mit konstantem Durchmesser zu nutzen.Valve group (e.g. on the base body 2 or on the valve needle 12), for example, can be used at any time with a valve of this type to provide a further injection point, if necessary, by moving the valve further into the intake manifold. The suction pipe-side seal is then taken over by the sealing element 45c, for example, instead of the sealing element 45d. Since the sealing elements 45 can be formed very easily with different thicknesses, it is possible to use different sealing elements 45b, 45c, 45d for sealing against the opening despite different valve outer diameters (e.g. largest diameter in the area of the solenoid coil 1, smallest diameter in the area of the valve closing body 18) a suction pipe socket with a constant diameter.
Die Dichtelemente 45 können auch andere Konturen als die in der Figur 1 dargestellten aufweisen. So können an den Außenseiten 48 der Dichtelemente 45 beispielsweise mehrere Dichtlippen 60 oder Dichtrippen vorgesehen sein, wie es dem in Figur 2 dargestellten Dichtelement 45 entnehmbar ist. Die einzelnen Dichtlippen 60 laufen dabei am äußeren Umfang des Dichtelements 45 beispielsweise ringförmig um. Es soll darauf verwiesen werden, daß das Dichtelement 45 nur zur besseren Verdeu lichung seiner Geometrie als separates, von der Kunststoffumspritzung 38 abgetrenntes Bauteil gezeigt ist, jedoch erfindungsgemäß nicht als eigenständig montierbares Dichtungsbauteil vorliegt. The sealing elements 45 can also have contours other than those shown in FIG. 1. For example, a plurality of sealing lips 60 or sealing ribs can be provided on the outer sides 48 of the sealing elements 45, as can be seen from the sealing element 45 shown in FIG. 2. The individual sealing lips 60 run around the outer circumference of the sealing element 45, for example in a ring. It should be pointed out that the sealing element 45 is shown as a separate component separated from the plastic encapsulation 38 only for better verification of its geometry, but according to the invention is not present as an independently mountable sealing component.

Claims

Patentansprüche claims
1. Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen, mit einer Ventillängsachse, mit einem Ventilgehäuse, mit einer axial bewegbaren Ventilnadel sowie mit einem Ventilschließkörper, der zum Öffnen und Schließen des Ventils mit einem festen Ventilsitz zusammenwirkt, mit einer das Ventilgehäuse zumindest teilweise umgebenden Kunststoffumspritzung und mit Dichtelementen, die das Brennstoffeinspritzventil nach außen hin abdichten, dadurch gekennzeichnet, daß wenigstens eines der Dichtelemente (45) einen flächigen und Stoffschlüssigen Kontakt zur Kunststoffumspritzung (38) aufweist, indem das wenigstens eine Dichtelement (45) und die Kunststoffumspritzung (38) aneinander angespritzt sind.1.Fuel injector for fuel injection systems of internal combustion engines, with a valve longitudinal axis, with a valve housing, with an axially movable valve needle and with a valve closing body which interacts to open and close the valve with a fixed valve seat, with a plastic encapsulation at least partially surrounding the valve housing and with sealing elements , which seal the fuel injection valve from the outside, characterized in that at least one of the sealing elements (45) has a flat and integral contact with the plastic encapsulation (38), in that the at least one sealing element (45) and the plastic encapsulation (38) are molded onto one another.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtelemente (45) aus Elastomer ausgebildet sind.2. Fuel injection valve according to claim 1, characterized in that the sealing elements (45) are made of elastomer.
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dichtelemente (45) jeweils eine der Ventillängsachse (10) abgewandte Außenseite (48) besitzen, die zumindest teilweise gewölbt ist. 3. Fuel injector according to claim 1 or 2, characterized in that the sealing elements (45) each have a valve longitudinal axis (10) facing away from the outside (48) which is at least partially curved.
4. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß wenigstens eines der Dichtelemente (45a) derart an der Kunststoffumspritzung (38) angespritzt ist, daß nur eine Oberseite (50) des Dichtelements (45) oder nur eine Unterseite (49) des Dichtelements (45a) , die weitgehend senkrecht zu einer der Ventillängsachse (10) zugewandten Innenseite (47) verläuft, einen flächigen Kontakt mit der Kunststoffumspritzung (38) besitzt .4. Fuel injection valve according to one of claims 1 to 3, characterized in that at least one of the sealing elements (45a) is molded onto the plastic extrusion coating (38) in such a way that only an upper side (50) of the sealing element (45) or only an underside (49 ) of the sealing element (45a), which runs largely perpendicular to an inner side (47) facing the valve longitudinal axis (10), has a flat contact with the plastic encapsulation (38).
5. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eines der Dichtelemente (45b, 45c) in einer umlaufenden Ringnut (58) am Umfang der Kunststoffumspritzung (38) eingespritzt ist, so daß zumindest eine der Ventillängsachse (10) zugewandte5. Fuel injection valve according to one of claims 1 to 3, characterized in that one of the sealing elements (45b, 45c) is injected in a circumferential annular groove (58) on the circumference of the plastic encapsulation (38), so that at least one of the valve longitudinal axis (10) faces
Innenseite (47) des Dichtelements (45b, 45c) einen flächigen Kontakt mit der Kunststoffumspritzung (38) besitzt.The inside (47) of the sealing element (45b, 45c) has a flat contact with the plastic encapsulation (38).
6. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß wenigstens eines der6. Fuel injection valve according to one of claims 1 to 3, characterized in that at least one of the
Dichtelemente (45d) in einen Stufenabschnitt (55) der Kunststoffumspritzung (38) eingebettet ist, so daß wenigstens zwei Seiten des Dichtelements (45d) einen flächigen Kontakt mit der Kunststoffumspritzung (38) besitzen.Sealing elements (45d) is embedded in a step section (55) of the plastic encapsulation (38), so that at least two sides of the sealing element (45d) have surface contact with the plastic encapsulation (38).
7. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß wenigstens ein Dichtelement (45) eine der Ventillängsachse (10) abgewandte Außenseite (48) besitzt, an der mehrere Dichtlippen (60) ausgebildet sind.7. Fuel injection valve according to claim 1 or 2, characterized in that at least one sealing element (45) has one of the valve longitudinal axis (10) facing away from the outside (48) on which a plurality of sealing lips (60) are formed.
8. Brennstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß die Dichtlippen (60) ringförmig an der Außenseite (48) des Dichtelements (45) umlaufen. 8. Fuel injection valve according to claim 7, characterized in that the sealing lips (60) circulate annularly on the outside (48) of the sealing element (45).
EP98940057A 1997-09-06 1998-06-26 Fuel injection valve Expired - Lifetime EP0937202B1 (en)

Applications Claiming Priority (3)

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DE19739150 1997-09-06
DE19739150A DE19739150A1 (en) 1997-09-06 1997-09-06 Fuel injector
PCT/DE1998/001757 WO1999013213A1 (en) 1997-09-06 1998-06-26 Fuel injection valve

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EP0937202A1 true EP0937202A1 (en) 1999-08-25
EP0937202B1 EP0937202B1 (en) 2002-03-20

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JP (1) JP4083244B2 (en)
DE (2) DE19739150A1 (en)
WO (1) WO1999013213A1 (en)

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US6076802A (en) 2000-06-20
JP4083244B2 (en) 2008-04-30
DE59803427D1 (en) 2002-04-25
DE19739150A1 (en) 1999-03-11
EP0937202B1 (en) 2002-03-20
JP2001504916A (en) 2001-04-10

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