EP1658429A1 - Fuel-injection valve - Google Patents

Fuel-injection valve

Info

Publication number
EP1658429A1
EP1658429A1 EP04738873A EP04738873A EP1658429A1 EP 1658429 A1 EP1658429 A1 EP 1658429A1 EP 04738873 A EP04738873 A EP 04738873A EP 04738873 A EP04738873 A EP 04738873A EP 1658429 A1 EP1658429 A1 EP 1658429A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
sleeve
seat body
fuel
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
EP04738873A
Other languages
German (de)
French (fr)
Other versions
EP1658429B1 (en
Inventor
Thomas Sebastian
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 EP1658429A1 publication Critical patent/EP1658429A1/en
Application granted granted Critical
Publication of EP1658429B1 publication Critical patent/EP1658429B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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 injection valve according to the preamble of the main claim, the z. B. is known from DE 195 27 049 AI.
  • the valve seat is manufactured in high quality by grinding and subsequent honing.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the valve seat body is held in the valve sleeve by a clamping sleeve without press fits with the resulting surface deterioration being required. This enables thermal decoupling and, at the same time, simple assembly with reliable tightness.
  • the clamping sleeve ' is advantageously elastic both in the radial and in the axial direction, as a result of which it remains in position itself on the one hand and on the other hand correctly positions the valve seat body and the spray orifice plate.
  • valve seat body is sealed against the valve sleeve in a simple and cost-effective manner by a sealing ring.
  • clamping sleeve can be produced in a simple manner by punching and bending.
  • FIG. 2A shows a schematic, excerpted section through the spray-side end of an exemplary embodiment of a fuel injector designed according to the invention
  • FIG. 2B shows a schematic perspective illustration of the clamping sleeve from the exemplary embodiment of a fuel injector designed according to the invention shown in FIG. 2A.
  • FIG. 1 first shows a longitudinal section through the part of a fuel injector 1 according to the prior art, which is particularly suitable for injecting fuel into an intake manifold (not shown) of an internal combustion engine, in a schematic sectional view.
  • the fuel injection valve 1 comprises an actuator in the exemplary embodiment in the form of a solenoid coil 2, which is wound on a coil carrier 3.
  • the coil carrier 3 is encapsulated in a valve housing 4.
  • the coil carrier 3 is penetrated by a valve sleeve 5, which is tubular and comprises a support tube 6, spread or welded therein, which serves as the inner pole of the magnet coil 2.
  • the valve housing 4 can serve, for example, as the outer pole of the magnetic coil 2.
  • An armature 7 is arranged on the outflow side of the support tube 6 and is integral with a valve needle 8 is trained .
  • through-flow openings 9 are provided which direct the fuel flowing through the fuel injection valve 1 to a sealing seat.
  • An annular filter 10 for filtering the fuel can be arranged in the area of the throughflow openings 9.
  • the valve needle 8 is preferably operatively connected by welding to a spherical valve closing body 11, which forms a sealing seat z with a valve seat body 12. Downstream of the sealing seat at least one Absprit zöf opening 14 is formed in a spray orifice plate 13, from which fuel is injected into the intake manifold not shown.
  • the armature 7 is acted upon by a return spring 15 in the idle state of the fuel injector 1 so that the fuel injector 1 is kept closed by the pressure of the valve closing body 11 on the valve seat body 12.
  • the return spring 15 is arranged in a recess 16 of the armature 7 or the support tube 6 and is preloaded by an adjusting sleeve (not shown).
  • the fuel injector 1 is closed as soon as the current exciting the magnet coil 2 is switched off and that Magnetic field has been reduced so far that the return spring 15 presses the armature 7 off the support tube 6, as a result of which the valve needle 8 moves in the outflow direction and the valve closing body 11 touches the valve seat body 12.
  • the fuel injection valve 1 shown in FIG. 1 is sealed off from the intake manifold of the internal combustion engine (not shown in more detail) by means of a preferably annular seal 18 which is pushed over a projecting edge 19 of the valve housing 4 and is secured against slipping off by means of a plastic extrusion coating 20.
  • Fuel injector 1 may be poor.
  • valve closing body 12 with the sealing seat formed thereon by grinding and honing achieves a high surface quality with a good seal associated therewith, this is achieved by the subsequent machining processes such as this
  • FIG. 1 An exemplary embodiment of a fuel injection valve 1 designed according to the invention shown in FIG. 1
  • the individual components are assembled in a simple manner.
  • the spray hole disk 13 is inserted into the valve sleeve 5 with a clearance fit.
  • the Valve seat body 12 mounted, which is sealed against the valve sleeve 5 via a sealing ring 24.
  • the valve seat body 12 also has a clearance fit with the valve sleeve 5.
  • the spray hole plate 13 is centered by a chamfer 25 on the side of the valve seat body 12 facing the spray hole plate 13.
  • the valve seat body 12 is fixed and, as a result, the fuel injector 1 is sealed by pressing the clamping sleeve 23 into the valve sleeve 5, which is supported on the valve seat body 12.
  • valve sleeve 5 deterioration in the surface quality of the valve sleeve 5 can be avoided on the one hand and the work steps of welding the valve seat body 12, the spray disk 13 and the valve sleeve 5 can also be saved. None of the components have to be manufactured with high precision, since only a clearance fit and no press fit is required.
  • valve seat body 12 This also achieves thermal decoupling of the valve seat body 12 from the valve sleeve 5, which enables improved hot behavior with respect to the fuel.
  • the clamping sleeve 23 is both radially and axially elastic and thus ensures its own correct position in the valve sleeve 5 as well as the positioning of the valve seat body 12 in the valve sleeve 5.
  • FIG. 2B The elasticity in two directions can be seen from FIG. 2B, in which the clamping sleeve 23 is shown in a perspective view in the unassembled state.
  • the clamping sleeve 23 has an axial slot 26, which determines the elasticity in the circumferential direction, as well as elastic tongues 27, which are formed on a side of the clamping sleeve 23 facing the valve seat body 12 and enable elastic support of the clamping sleeve 23 on the valve seat body 12.
  • the invention is not limited to the illustrated embodiment and for any construction of fuel fine injection valves 1 suitable, for. B. for fuel injection valves 1 with piezoelectric actuators. In particular, any combination of the individual features is possible.

Abstract

The invention relates to a fuel-injection valve (1) for fuel-injection systems of internal combustion engines. Said valve comprises a solenoid (2) and an armature (7) that can be excited by the solenoid (2) and that co-operates with a valve closing body (11), the latter forming a sealed seat with a valve seat body (12) that is located in a valve sleeve (5). The valve seat body (12) is fixed in the valve sleeve (5) by means of a clamping collar (23).

Description

Brennstoffeinspritzventil Fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinsprit zventil nach der Gattung des Hauptanspruchs, das z. B. aus der DE 195 27 049 AI bekannt ist.The invention relates to a fuel injection valve according to the preamble of the main claim, the z. B. is known from DE 195 27 049 AI.
Zur Abdichtung eines Brennstoffeinsprit zventils gegenüber seiner Umgebung sind Herstellungsprozesse erforderlich, welche eine hohe Oberflächenqualität und -geometrie gewährleisten. Der Ventilsitz wird dabei durch Schleifen und nachfolgendes Honen in hoher Qualität hergestellt.To seal a fuel injection valve from its surroundings, manufacturing processes are required which ensure a high surface quality and geometry. The valve seat is manufactured in high quality by grinding and subsequent honing.
Alle anschließenden Prozesse, wie z. B. das Einpressen des Ventilsitzes ins Ventilgehäuse oder das Verbinden des Ventilsitzes mit dem Ventilgehäuse durch eine Schweißnaht, verschlechtern die Qualität der Oberflächen und damit die Dichtigkeit des Brennstoffeinspritzventils . Insbesondere die für die Dichtigkeit wichtigen Rundheitswerte am Dichtdurchmesser verschlechtern sich. Dies wirkt sich nachteilig auf die Abgaswerte aus, da Brennstoff am Dichtsitz vorbei in das Saugrohr oder den Brennraum gelangen kann und dadurch ein zu fettes Gemisch mit resultierender schlechter Verbrennung und hoher Emission entsteht. Weiterhin ist bei den bekannten Brennstoffeinspritzventilen von Nachteil, daß eine großflächige thermische Anbindung des Ventilsitzes an die Ventilhülse vorliegt, wodurch sich das Heißverhalten gegenüber Brennstoff verschlechtert .All subsequent processes, such as B. the pressing of the valve seat into the valve housing or the connection of the valve seat to the valve housing by a weld, deteriorate the quality of the surfaces and thus the tightness of the fuel injector. In particular, the roundness values on the sealing diameter, which are important for tightness, deteriorate. This has a disadvantageous effect on the exhaust gas values, since fuel can get past the sealing seat and into the intake manifold or the combustion chamber, resulting in a mixture that is too rich, resulting in poor combustion and high emissions. A further disadvantage of the known fuel injection valves is that there is a large-area thermal connection of the valve seat to the valve sleeve, as a result of which the hot behavior towards fuel deteriorates.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Ventilsitzkorper durch eine Klemmhülse in der Ventilhülse gehalten wird, ohne daß Preßpassungen mit resultierender Oberflächenverschlechterung benötigt werden. Dadurch wird eine thermische Entkoppelung und gleichzeitig eine einfache Montage mit zuverlässiger Dichtigkeit ermöglicht.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that the valve seat body is held in the valve sleeve by a clamping sleeve without press fits with the resulting surface deterioration being required. This enables thermal decoupling and, at the same time, simple assembly with reliable tightness.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.Advantageous further developments and improvements of the fuel injector specified in the main claim are possible through the measures listed in the subclaims.
Vorteilhafterweise ist die Klemmhülse' sowohl in radialer als auch in axialer Richtung elastisch, wodurch sie einerseits selbst in Position bleibt und andererseits den Ventilsitzkorper und die Spritzlochscheibe korrekt positioniert .The clamping sleeve ' is advantageously elastic both in the radial and in the axial direction, as a result of which it remains in position itself on the one hand and on the other hand correctly positions the valve seat body and the spray orifice plate.
Weiterhin ist von Vorteil, daß der Ventilsitzkorper in einfacher und kostengünstiger Weise durch einen Dichtring gegen die Ventilhülse abgedichtet ist.Another advantage is that the valve seat body is sealed against the valve sleeve in a simple and cost-effective manner by a sealing ring.
Ebenso ist von Vorteil, daß die Klemmhülse in einfacher Weise durch Stanzen und Biegen herstellbar ist .Another advantage is that the clamping sleeve can be produced in a simple manner by punching and bending.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: Fig. 1 einen schematischen, auszugsweisen Schnitt durch ein Ausführungsbeispiel eines Brennstoffeinspritzventils gemäß dem Stand der Technik,An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it: 1 is a schematic, excerpted section through an embodiment of a fuel injector according to the prior art,
Fig. 2A einen schematischen, auszugsweisen Schnitt durch das abspritzseitige Ende eines Ausführungsbeispiels eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils, und2A shows a schematic, excerpted section through the spray-side end of an exemplary embodiment of a fuel injector designed according to the invention, and
Fig. 2B eine schematische perspektivische Darstellung der Klemmhülse aus dem in Fig. 2A dargestellten Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils .FIG. 2B shows a schematic perspective illustration of the clamping sleeve from the exemplary embodiment of a fuel injector designed according to the invention shown in FIG. 2A.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Fig. 1 zeigt zur besseren Verständlichkeit der erfindungsgemäßen Maßnahmen zunächst in einer ausschnittsweisen, schematisierten Schnittdarstellung einen Längsschnitt durch den abspritzseitigen Teil eines Brennstoffeinspritzventils 1 gemäß dem Stand der Technik, welches insbesondere zum Einspritzen von Brennstoff in ein nicht näher dargestelltes Saugrohr einer Brennkraftmaschine geeignet ist.For a better understanding of the measures according to the invention, FIG. 1 first shows a longitudinal section through the part of a fuel injector 1 according to the prior art, which is particularly suitable for injecting fuel into an intake manifold (not shown) of an internal combustion engine, in a schematic sectional view.
Das Brennstoffeinspritzventil 1 umfaßt einen Aktuator im Ausführungsbeispiel in Form einer Magnetspule 2, die auf einen Spulenträger 3 gewickelt ist. Der Spulenträger 3 ist in einem Ventilgehäuse 4 gekapselt .The fuel injection valve 1 comprises an actuator in the exemplary embodiment in the form of a solenoid coil 2, which is wound on a coil carrier 3. The coil carrier 3 is encapsulated in a valve housing 4.
Der Spulenträger 3 wird von einer Ventilhülse 5 durchgriffen, die rohrförmig ausgestaltet ist und ein darin eingespreiztes oder verschweißtes Stützrohr 6 umfaßt, welches als Innenpol der Magnetspule 2 dient. Als Außenpol der Magnetspule 2 kann beispielsweise das Ventilgehäuse 4 dienen. Abströmseitig des Stützrohres 6 ist ein Anker 7 angeordnet, der einstückig mit einer Ventilnadel 8 ausgebildet ist . In der Ventilnadel 8 sind Durchströmöf fnungen 9 vorgesehen, die den das Brennstof f einsprit zventil 1 durchströmenden Brennstoff zu einem Dichtsit z leiten .The coil carrier 3 is penetrated by a valve sleeve 5, which is tubular and comprises a support tube 6, spread or welded therein, which serves as the inner pole of the magnet coil 2. The valve housing 4 can serve, for example, as the outer pole of the magnetic coil 2. An armature 7 is arranged on the outflow side of the support tube 6 and is integral with a valve needle 8 is trained . In the valve needle 8, through-flow openings 9 are provided which direct the fuel flowing through the fuel injection valve 1 to a sealing seat.
Im Bereich der Durchströmöf fnungen 9 kann ein Ringf ilter 10 zur Filterung des Brennstof fs angeordnet sein . Die Ventilnadel 8 steht vorzugsweise durch Schweißen in Wirkverbindung mit einem im Ausführungsbeispiel kugelförmigen Vent il schl ießkörper 11 , der mit einem Ventilsit zkorper 12 einen Dichtsit z bildet . Stromabwärts des Dichtsitzes ist in einer Spritzlochscheibe 13 wenigstens eine Absprit zöf nung 14 ausgebildet , aus der Brennstoff in das nicht weiter dargestel lte Saugrohr eingespritzt wird .An annular filter 10 for filtering the fuel can be arranged in the area of the throughflow openings 9. The valve needle 8 is preferably operatively connected by welding to a spherical valve closing body 11, which forms a sealing seat z with a valve seat body 12. Downstream of the sealing seat at least one Absprit zöf opening 14 is formed in a spray orifice plate 13, from which fuel is injected into the intake manifold not shown.
Der Anker 7 ist im Ruhezustand des Brennstoffeinspritzventils 1 von einer Rückstellfeder 15 so beaufschlagt, daß das Brennstoffeinspritzventil 1 durch den Andruck des Ventilschließkörpers 11 auf den Ventilsitzkorper 12 geschlossen gehalten wird. Die Rückstellfeder 15 ist in einer Ausnehmung 16 des Ankers 7 bzw. des Stützrohres 6 angeordnet und wird durch eine nicht weiter dargestellte Einstellhülse auf Vorspannung gebracht.The armature 7 is acted upon by a return spring 15 in the idle state of the fuel injector 1 so that the fuel injector 1 is kept closed by the pressure of the valve closing body 11 on the valve seat body 12. The return spring 15 is arranged in a recess 16 of the armature 7 or the support tube 6 and is preloaded by an adjusting sleeve (not shown).
Wird der Magnetspule 2 über eine nicht weiter dargestellte elektrische Leitung ein elektrischer Strom zugeführt, baut sich ein magnetisches Feld auf, das bei ausreichender Stärke den Anker 7 entgegen der Kraft der Rückstellfeder 15 entgegen der Strömungsrichtung des Brennstoffs in die Magnetspule 2 hineinzieht. Dadurch wird ein zwischen dem Anker 7 und dem Stützrohr 6 ausgebildeter Arbeitsspalt 17 geschlossen. Durch die Bewegung des Ankers 7 wird auch die mit dem Anker 7 einstückig ausgebildete Ventilnadel 8 in Hubrichtung mitgenommen, so daß der Ventilschließkörper 11 vom Ventilsitzkorper 12 abhebt und Brennstoff zur Abspritzöffnung 14 geleitet wird.If an electrical current is supplied to the magnet coil 2 via an electrical line (not shown further), a magnetic field is built up which, with sufficient strength, pulls the armature 7 into the magnet coil 2 against the force of the return spring 15 against the direction of flow of the fuel. As a result, a working gap 17 formed between the armature 7 and the support tube 6 is closed. The movement of the armature 7 also causes the valve needle 8, which is formed in one piece with the armature 7, to be taken along in the stroke direction, so that the valve closing body 11 lifts off the valve seat body 12 and fuel is conducted to the spray opening 14.
Das Brennstoffeinspritzventil 1 wird geschlossen, sobald der die Magnetspule 2 erregende Strom abgeschaltet und das Magnetfeld soweit abgebaut ist, daß die Rückstellfeder 15 den Anker 7 vom Stützrohr 6 abdrückt, wodurch sich die Ventilnadel 8 in Abströmrichtung bewegt und der Ventilschließkörper 11 auf dem Ventilsitzkorper 12 aufsetzt.The fuel injector 1 is closed as soon as the current exciting the magnet coil 2 is switched off and that Magnetic field has been reduced so far that the return spring 15 presses the armature 7 off the support tube 6, as a result of which the valve needle 8 moves in the outflow direction and the valve closing body 11 touches the valve seat body 12.
Die Abdichtung des in Fig. 1 dargestellten Brennstoffeinspritzventils 1 gegen das nicht näher dargestellte Saugrohr der Brennkraftmaschine erfolgt mittels einer vorzugsweise ringförmigen Dichtung 18, welche über einen vorkragenden Rand 19 des Ventilgehauses 4 geschoben und mittels einer Kunststoffumspritzung 20 gegen Abrutschen gesichert ist.The fuel injection valve 1 shown in FIG. 1 is sealed off from the intake manifold of the internal combustion engine (not shown in more detail) by means of a preferably annular seal 18 which is pushed over a projecting edge 19 of the valve housing 4 and is secured against slipping off by means of a plastic extrusion coating 20.
Die innere Abdichtung des Brennstoffeinspritzventils 1 gegenüber dem Saugrohr ist bedingt durch dieThe inner seal of the fuel injector 1 with respect to the intake manifold is due to the
Bearbeitungsprozesse bei der Herstellung desMachining processes in the manufacture of the
Brennstoffeinspritzventils 1 unter Umständen nur mangelhaft.Fuel injector 1 may be poor.
Zwar wird durch die Fertigung des Ventilschließkörpers 12 mit dem daran ausgebildeten Dichtsitz durch Schleifen und Honen eine hohe Oberflächenqualität mit einer damit verbundenen guten Dichtigkeit erzielt, dies wird jedoch durch die nachfolgenden Bearbeitungsprozesse wie dasAlthough the manufacture of the valve closing body 12 with the sealing seat formed thereon by grinding and honing achieves a high surface quality with a good seal associated therewith, this is achieved by the subsequent machining processes such as this
Einpressen des Ventilsitzkörpers 12 in die Ventilhülse 5 sowie das Verbinden der genannten Bauteile mittels einer ersten Schweißnaht 21 sowie die Verbindung desPressing the valve seat body 12 into the valve sleeve 5 and connecting the components mentioned by means of a first weld seam 21 and connecting the
Ventilsitzkörpers 12 mit der Spritzlochscheibe 13 durch eine zweite Schweißnaht 22 wieder relativiert.Valve seat body 12 with the spray plate 13 relativized by a second weld 22 again.
Demgegenüber weist ein in Fig. 2A dargestelltes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 eine Klemmhülse 23 auf, welche anstelle der Schweißnähte 21 und 22 für den korrekten Sitz des Ventilsitzkörpers 12 in der Ventilhülse 5 sowie der Spritzlochscheibe 13 zwischen Ventilsitzkorper 12 und Ventilhülse 5 sorgt.By contrast, an exemplary embodiment of a fuel injection valve 1 designed according to the invention shown in FIG.
Die Montage der einzelnen Bauteile erfolgt dabei auf einfache Weise. Zunächst wird die Spritzlochscheibe 13 in Spielpassung in die Ventilhülse 5 eingelegt. Danach wird der Ventilsitzkorper 12 montiert, welcher über einen Dichtring 24 gegen die Ventilhülse 5 abgedichtet ist. Der Ventilsitzkorper 12 hat zur Ventilhülse 5 ebenfalls Spielpassung. Durch eine Fase 25 an dem der Spritzlochscheibe 13 zugewandten Seite des Ventilsitzkörpers 12 wird die Spritzlochscheibe 13 zentriert. Die Fixierung des Ventilsitzkörpers 12 sowie daraus resultierend die Abdichtung des Brennstoffeinspritzventils 1 erfolgt durch das Einpressen der Klemmhülse 23 in die Ventilhülse 5, die sich am Ventilsitzkorper 12 abstützt. Dadurch können einerseits Verschlechterungen der Oberflächenqualität der Ventilhülse 5 vermieden und zudem die Arbeitsschritte des Verschweißens von Ventilsitzkorper 12, Spritzlochscheibe 13 und Ventilhülse 5 eingespart werden. Keines der Bauteile muß hochpräzise hergestellt sein, da lediglich eine Spielpassung und keine Preßpassung erforderlich ist.The individual components are assembled in a simple manner. First, the spray hole disk 13 is inserted into the valve sleeve 5 with a clearance fit. Then the Valve seat body 12 mounted, which is sealed against the valve sleeve 5 via a sealing ring 24. The valve seat body 12 also has a clearance fit with the valve sleeve 5. The spray hole plate 13 is centered by a chamfer 25 on the side of the valve seat body 12 facing the spray hole plate 13. The valve seat body 12 is fixed and, as a result, the fuel injector 1 is sealed by pressing the clamping sleeve 23 into the valve sleeve 5, which is supported on the valve seat body 12. As a result, deterioration in the surface quality of the valve sleeve 5 can be avoided on the one hand and the work steps of welding the valve seat body 12, the spray disk 13 and the valve sleeve 5 can also be saved. None of the components have to be manufactured with high precision, since only a clearance fit and no press fit is required.
Dadurch wird zudem eine thermische Entkoppelung des Ventilsitzkörpers 12 von der Ventilhülse 5 erreicht, welche ein verbessertes Heißverhalten gegenüber dem Brennstoff ermöglicht .This also achieves thermal decoupling of the valve seat body 12 from the valve sleeve 5, which enables improved hot behavior with respect to the fuel.
Die Klemmhülse 23 ist sowohl radial als auch axial elastisch und sorgt somit einerseits für ihre eigene korrekte Position in der Ventilhülse 5 als auch für die Positionierung des Ventilsitzkörpers 12 in der Ventilhülse 5.The clamping sleeve 23 is both radially and axially elastic and thus ensures its own correct position in the valve sleeve 5 as well as the positioning of the valve seat body 12 in the valve sleeve 5.
Die Elastizität in zwei Richtungen ist aus Fig. 2B ersichtlich, in welcher die Klemmhülse 23 in einer perspektivischen Darstellung in unmontierten Zustand gezeigt ist. Die Klemmhülse 23 weist einen axialen Schlitz 26 auf, welcher die Elastizität in Umfangsrichtung bedingt, sowie elastische Zungen 27, welche an einer dem Ventilsitzkorper 12 zugewandten Seite der Klemmhülse 23 ausgebildet sind und eine elastische Abstützung der Klemmhülse 23 auf dem Ventilsitzkorper 12 ermöglichen.The elasticity in two directions can be seen from FIG. 2B, in which the clamping sleeve 23 is shown in a perspective view in the unassembled state. The clamping sleeve 23 has an axial slot 26, which determines the elasticity in the circumferential direction, as well as elastic tongues 27, which are formed on a side of the clamping sleeve 23 facing the valve seat body 12 and enable elastic support of the clamping sleeve 23 on the valve seat body 12.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und für beliebige Bauweisen von Brennstof feinspritzventilen 1 geeignet, z. B. für Brennstoffeinspritzventile 1 mit piezoelektrischen Aktoren. Insbesondere sind beliebige Kombinationen der einzelnen Merkmale möglich. The invention is not limited to the illustrated embodiment and for any construction of fuel fine injection valves 1 suitable, for. B. for fuel injection valves 1 with piezoelectric actuators. In particular, any combination of the individual features is possible.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1) für1. Fuel injector (1) for
Brennstoffeinspritzanlagen von Brennkraftmaschinen mit einemFuel injection systems of internal combustion engines with one
Aktuator (2), der mit einem Ventilschließkörper (11) inActuator (2) with a valve closing body (11) in
Wirkverbindung steht, welcher mit einem in einer Ventilhülse (5) angeordneten Ventilsitzkorper (12) einen Dichtsitz bildet, dadurch gekennzeichnet, daß der Ventilsitzkorper (12) mittels einer Klemmhülse (23) in der Ventilhülse (5) fixiert ist.There is an operative connection which forms a sealing seat with a valve seat body (12) arranged in a valve sleeve (5), characterized in that the valve seat body (12) is fixed in the valve sleeve (5) by means of a clamping sleeve (23).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß der Ventilsitzkorper (12) mittels eines Dichtrings (24) gegenüber der Ventilhülse (5) abgedichtet ist.2. Fuel injection valve according to claim 1, characterized in that the valve seat body (12) is sealed off from the valve sleeve (5) by means of a sealing ring (24).
3. Brennstoffeinspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Spritzlochscheibe (13) in Spielpassung mit einer Anfasung (25) des Ventilsitzkörpers (12) gehalten ist.3. Fuel injection valve according to claim 1 or 2, characterized in that a spray orifice plate (13) is held in a clearance fit with a chamfer (25) of the valve seat body (12).
4. Brennstoffeinspritzventil nach Anspruch 3 , dadurch gekennzeichnet, daß die Spritzlochscheibe (13) durch den Ventilsitzkorper (12) in der Ventilhülse (5) zentriert ist. 4. Fuel injection valve according to claim 3, characterized in that the spray orifice plate (13) by the valve seat body (12) in the valve sleeve (5) is centered.
5. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Klemmhülse (23) in die Ventilhülse (5) eingepreßt ist .5. Fuel injection valve according to one of claims 1 to 4, characterized in that the clamping sleeve (23) is pressed into the valve sleeve (5).
6. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Klemmhülse (23) einen axialen Schlitz (26) aufweist.6. Fuel injection valve according to one of claims 1 to 5, characterized in that the clamping sleeve (23) has an axial slot (26).
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Klemmhülse (23) elastische Zungen (27) aufweist.7. Fuel injection valve according to one of claims 1 to 6, characterized in that the clamping sleeve (23) has elastic tongues (27).
8. Brennstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß die elastischen Zungen (27) in Anlage an dem Ventilsitzkorper (12) sind.8. Fuel injection valve according to claim 7, characterized in that the elastic tongues (27) are in contact with the valve seat body (12).
9. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Klemmhülse (23) radial und axial elastisch ist.9. Fuel injection valve according to one of claims 1 to 8, characterized in that the clamping sleeve (23) is radially and axially elastic.
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis10. Fuel injection valve according to one of claims 1 to
9, dadurch gekennzeichnet, daß die Klemmhülse (23) durch Stanzen und Biegen herstellbar ist . 9, characterized in that the clamping sleeve (23) can be produced by punching and bending.
EP04738873A 2003-08-19 2004-07-07 Fuel-injection valve Expired - Fee Related EP1658429B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10338081A DE10338081A1 (en) 2003-08-19 2003-08-19 Fuel injector
PCT/DE2004/001451 WO2005019641A1 (en) 2003-08-19 2004-07-07 Fuel-injection valve

Publications (2)

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EP1658429A1 true EP1658429A1 (en) 2006-05-24
EP1658429B1 EP1658429B1 (en) 2007-05-23

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EP04738873A Expired - Fee Related EP1658429B1 (en) 2003-08-19 2004-07-07 Fuel-injection valve

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US (1) US8191797B2 (en)
EP (1) EP1658429B1 (en)
JP (1) JP2006513364A (en)
DE (2) DE10338081A1 (en)
WO (1) WO2005019641A1 (en)

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PL1975486T3 (en) * 2007-03-28 2015-05-29 Fillon Tech Sas Societe Par Actions Simplifiee Dispensing valve
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Also Published As

Publication number Publication date
US20070057088A1 (en) 2007-03-15
EP1658429B1 (en) 2007-05-23
US8191797B2 (en) 2012-06-05
DE502004003900D1 (en) 2007-07-05
JP2006513364A (en) 2006-04-20
DE10338081A1 (en) 2005-03-10
WO2005019641A1 (en) 2005-03-03

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