EP1606508B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1606508B1
EP1606508B1 EP04704534A EP04704534A EP1606508B1 EP 1606508 B1 EP1606508 B1 EP 1606508B1 EP 04704534 A EP04704534 A EP 04704534A EP 04704534 A EP04704534 A EP 04704534A EP 1606508 B1 EP1606508 B1 EP 1606508B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
valve according
actuator
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.)
Expired - Lifetime
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EP04704534A
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German (de)
French (fr)
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EP1606508A1 (en
Inventor
Hubert Stier
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the independent claim.
  • a metering valve for metering of liquids or gases in particular an injection valve for fuel injection systems in internal combustion engines, which has a piezo stack actuator, the change in length is transmitted upon application of an excitation voltage to a metering opening controlling valve needle and determines the stroke of the valve needle.
  • the substance to be metered is supplied via a supply line, which is designed in the form of a deep hole in the valve body.
  • a disadvantage of the publication DE 35 33 085 A1 known injection valve is that the housing of the injector is very solid and therefore heavy and bulky. It requires a large installation space and increased material and manufacturing costs.
  • the fuel injector includes an inlet port for providing fuel to the fuel injector, a piezoelectric or magnetostrictive actuator sealed to the fuel, and a valve closure member actuated by the actuator by means of a valve needle.
  • the fuel injector according to the invention with the characterizing features of the independent claim has the advantage that the fuel supply is arranged centrally and modularly constructed of a connecting piece, a pipe and the actuator base of the actuator, wherein the tube is inserted into a bore in the actuator base, whereby the fuel is guided through the interior of the fuel injection valve and a solid housing can be omitted with a deep hole.
  • a plastic extrusion of the fuel inlet with molded fastening and contact connections can be produced in a simple and cost-effective manner.
  • the individual components of the fuel feed are produced by turning and connected to one another by means of welding.
  • the fuel feed is constructed in two parts, wherein the individual components can be produced by turning or deep drawing and then welded together in the region of the tube.
  • the fuel inlet is sealed by means of labyrinth seals against the plastic extrusion.
  • Another advantage is that holes in the actuator base allow an encapsulation of the actuator for heat conduction after pre-assembly.
  • a fuel injection valve according to the prior art will be briefly explained in its essential components for better understanding.
  • This in Fig. 1 shown fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 comprises a housing 2, in which a provided with an Aktorumspritzung 3 piezoelectric or magnetostrictive actuator 4 is arranged.
  • the actuator 4 can by means of an electrical line 5, to which a protruding from the housing 2 electrical terminal 6 may be formed, an electrical voltage be supplied.
  • the actuator 4 is supported on the inflow side on an actuator base 7 and downstream on an actuator head 8.
  • a biasing spring 9 acts on the actuator 4 with a bias voltage.
  • the housing 2 has a bore 10, which serves the fuel line from an inlet nozzle 11 to a sealing seat of the fuel injection valve 1, not shown.
  • the bore 10 is introduced parallel to the actuator 4 in the housing 2 and executed in two parts.
  • a first portion 12 is inserted obliquely into the housing 2 and extends from the inlet nozzle 11 to a second portion 13, which extends in a straight line through the housing over its entire axial extent.
  • Reason for the two-part design is the impossibility to produce a kinking hole 10 in a single operation cost and easy.
  • the second section 13 is closed on the inflow side of a junction 14 in the first section 12 with a closure body 15.
  • a disadvantage of this manufacturing method for the bore 10 to the fuel line is the massive housing 2, which must have a minimum wall thickness, so that a bore 10 can be introduced with a sufficient diameter.
  • the fuel injection valve 1 is very solid.
  • a corresponding receiving bore in a cylinder head of the internal combustion engine must also be correspondingly large in order to accommodate the fuel injector 1 can.
  • Fig. 2A and 2 B show in two mutually perpendicular sectional planes along a longitudinal axis 16 of the fuel injection valve 1, a first embodiment of a fuel injection valve 1 according to the invention, which has a variably modifiable fuel inlet 17.
  • the fuel inlet 17 includes a tube 18 which is inserted into a bore 19 of the actuator base 7 and with the Actuator 7 is preferably connected via a weld 20.
  • a connecting piece 21 is placed and preferably also connected to the tube 18 by a weld 20.
  • the connecting piece 21 is z. B. made in a simple manner as a turned part.
  • the pre-assembled components 7, 18 and 21 are provided with a Kunststoffumspritzung 22, to which in the embodiment of the electrical connection 6 is formed.
  • the supplied through the connecting piece 21 fuel is passed through the pipe 18 and the bore 19 in the actuator base 7. Radial bores 23 in the actuator base 7 lead the fuel into an interior 24 of the fuel injection valve 1.
  • the fuel flows around an actuator cartridge 25, in which the actuator 2 provided with the actuator 3 is encapsulated together with the actuator head 8 and the biasing spring 9.
  • the actuator cartridge 25 is connected to the actuator base 7 via a further weld 20 downstream of the radial bores 23, as well as the housing 2 of the fuel injection valve 1 is connected to this inflow side via a weld 20.
  • Labyrinth seals 35 provide the seal between the plastic extrusion 22 and the actuator base 7 and with the connecting piece 21.
  • the actuator cartridge 25 is sealed by a seal 26, which may be 26, for example, as a corrugated pipe seal against the fuel.
  • the housing 2 of the fuel injection valve 1 is advantageously formed in one piece.
  • the advantage of a fuel supply 17 as in Fig. 2A in particular, the possibility of being able to adapt the fuel supply to individual installation situations by means of a modular construction without great effort is shown.
  • the elimination of a deep hole and the associated high wall thickness of the housing are advantageous.
  • the inventively designed fuel injector 1 is due to the thin-walled housing 2 slim and therefore does not require much installation space.
  • the cross-section of the tube 18 can be chosen so that pressure pulsations in the fuel injector 1 can be avoided and the metering dynamics can be improved.
  • the Kunststoffumspritsung 22 is variably formable and may include the plug connection 6 and other fasteners.
  • the fuel injection valve 1 has the downstream side of the actuator cartridge 25 via an actuating element 27 for a valve needle 28, which comprises at its downstream end a valve closing body 29 which forms a sealing seat with a formed on the housing 2 valve seat surface 30.
  • a return element 33 holds the fuel injection valve 1, which is formed in the present embodiment as an outwardly opening fuel injector 1, closed in the unloaded state of the actuator 4 and ensures after switching off the Excitation voltage for the return of the valve needle 28th
  • Fig. 2B shows to illustrate the measures according to the invention a further section through the in Fig. 2A illustrated fuel injector 1 along the line IIB-IIB in Fig. 2A ,
  • the actuator base has, in addition to the radial bores 23, at least one, in the exemplary embodiment, two axial bores 34, which can serve to introduce the actuator encapsulation 3 after the assembly of the actuator cartridge 25 and before the encapsulation of the fuel inlet 17. This mainly fulfills the task of heat dissipation from the actuator 2.
  • Fig. 3A shows a non-inventive fuel injection valve.
  • Fig. 3B to 3C show further advantageous embodiments of an inventively designed fuel injector 1.
  • the same components are provided in all figures with corresponding reference numerals.
  • Fig. 3A shows a Bremmscherinspritzventil not according to the invention, in which the connecting piece 21, the tube 18 and the actuator base 7 are formed as a one-piece rotary member.
  • the disadvantage here is compared to the individual production of said components, the long rotation time for the provided with several paragraphs and the labyrinth seals 35 rotary member.
  • Fig. 3B shows one opposite Fig. 3A slightly modified variant of the invention, which combines the advantages of a waiving weld 20 with ease of manufacture of two components to be combined together.
  • a first pipe section 36 of the pipe 18 and the connecting piece 21 are made in one piece by turning and connected by a weld 20 with a second pipe section 37 of the tube 18, which in turn is made in one piece with the actuator base 7 by turning.
  • the fuel feed 17 is also as in Fig. 3B formed in two parts, wherein the downstream component of Aktorfuß 7 and second pipe section 37 identical to Fig. 3B may be executed, the first pipe section 36, however, formed as a deep-drawn part with integrally formed collar 38 and also connected to the second pipe section 37 via a weld 20.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des unabhängigen Anspruchs.The invention relates to a fuel injection valve according to the preamble of the independent claim.

Aus der DE 35 33 085 A1 ist ein Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen, insbesondere ein Einspritzventil für Kraftstoff-Einspritzsysteme in Brennkraftmaschinen bekannt, welches einen Piezo-Stapelaktor aufweist, dessen Längenänderung bei Anlegen einer Erregerspannung auf eine eine Zumeßöffnung steuernde Ventilnadel übertragen wird und den Hubweg der Ventilnadel bestimmt. Der zuzumessende Stoff wird über eine Zuleitung zugeführt, welche in Form einer Tieflochbohrung im Ventilkörper ausgeführt ist.From the DE 35 33 085 A1 is a metering valve for metering of liquids or gases, in particular an injection valve for fuel injection systems in internal combustion engines, which has a piezo stack actuator, the change in length is transmitted upon application of an excitation voltage to a metering opening controlling valve needle and determines the stroke of the valve needle. The substance to be metered is supplied via a supply line, which is designed in the form of a deep hole in the valve body.

Nachteilig an dem aus der Druckschrift DE 35 33 085 A1 bekannten Einspritzventil ist, daß das Gehäuse des Einspritzventils sehr massiv und damit schwer und voluminös ist. Es erfordert einen großen Einbauraum sowie erhöhte Material- und Herstellungskosten.A disadvantage of the publication DE 35 33 085 A1 known injection valve is that the housing of the injector is very solid and therefore heavy and bulky. It requires a large installation space and increased material and manufacturing costs.

Dokument US 5 769 391 geht aus von einem Brennstoffeinspritzventil für Brennstoffeinspritzsysteme in Verbrennungsmaschinen. Das Brennstoffeinspritzventil umfasst einen Zulaufstutzen, um das Brennstoffeinspritzventil mit Brennstoff zu versorgen, einen piezoelektrischen oder magnetostriktiven Aktor, der gegenüber dem Brennstoff abgedichtet ist und einen Ventilschließkörper, der von dem Aktor mittels einer Ventilnadel betätigt wird.document US 5,769,391 assumes a fuel injection valve for fuel injection systems in internal combustion engines. The fuel injector includes an inlet port for providing fuel to the fuel injector, a piezoelectric or magnetostrictive actuator sealed to the fuel, and a valve closure member actuated by the actuator by means of a valve needle.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des unabhängigen Anspruchs hat demgegenüber den Vorteil, daß der Brennstoffzulauf zentral angeordnet und modular aus einem Anschlußstutzen, einem Rohr und dem Aktorfuß des Aktors aufgebaut ist, wobei das Rohr in eine Bohrung im Aktorfuß eingeschoben ist, wodurch der Brennstoff durch den Innenraum des Brennstoffeinspritzventils geführt wird und ein massives Gehäuse mit einer Tieflochbohrung entfallen kann. Eine Kunststoffumspritzung des Brennstoffzulaufs mit angeformten Befestigungs- und Kontaktanschlüssen ist dabei in einfacher und kostengünstiger Weise herstellbar.The fuel injector according to the invention with the characterizing features of the independent claim has the advantage that the fuel supply is arranged centrally and modularly constructed of a connecting piece, a pipe and the actuator base of the actuator, wherein the tube is inserted into a bore in the actuator base, whereby the fuel is guided through the interior of the fuel injection valve and a solid housing can be omitted with a deep hole. A plastic extrusion of the fuel inlet with molded fastening and contact connections can be produced in a simple and cost-effective manner.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im unabhängigen Anspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in the independent claim are possible.

Vorteilhafterweise sind die einzelnen Komponenten des Brennstoffzulaufs durch Drehen hergestellt und mittels Schweißen miteinander verbunden.Advantageously, the individual components of the fuel feed are produced by turning and connected to one another by means of welding.

In einer weiteren vorteilhaften Ausführungsvariante ist der Brennstoffzulauf zweiteilig aufgebaut, wobei die einzelnen Komponenten durch Drehen oder Tiefziehen herstellbar und dann im Bereich des Rohres miteinander verschweißt sind.In a further advantageous embodiment, the fuel feed is constructed in two parts, wherein the individual components can be produced by turning or deep drawing and then welded together in the region of the tube.

Der Brennstoffzulauf ist mittels Labyrinthdichtungen gegen die Kunststoffumspritzung abgedichtet.The fuel inlet is sealed by means of labyrinth seals against the plastic extrusion.

Von Vorteil ist außerdem, daß Bohrungen im Aktorfuß eine Umspritzung des Aktors zur Wärmeleitung nach der Vormontage erlauben.Another advantage is that holes in the actuator base allow an encapsulation of the actuator for heat conduction after pre-assembly.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch den zuströmseitigen Teil eines Brennstoffeinspritzventils gemäß dem Stand der Technik,
Fig. 2A-B
schematische Schnitte in zwei zueinander senkrechten Ebenen durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils und
Fig. 3A
schematischer Schnitt, nicht Gegenstand der Erfindung
Fig. 3B-C
schematische Schnitte durch weitere bevorzugte Ausführungsformen erfindungsgemäß ausgestalteter Brennstoffeinspritzventile.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through the upstream part of a fuel injection valve according to the prior art,
Fig. 2A-B
schematic sections in two mutually perpendicular planes through a first embodiment of a fuel injection valve according to the invention and
Fig. 3A
schematic section, not the subject of the invention
Fig. 3B-C
schematic sections through further preferred embodiments inventively ausgestalteter fuel injectors.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Nachfolgend werden Ausführungsbeispiele der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.Hereinafter, embodiments of the invention will be described by way of example. Matching components are provided in all figures with matching reference numerals.

Bevor die Erfindung anhand bevorzugter Ausführungsformen näher beschrieben wird, wird zum besseren Verständnis ein Brennstoffeinspritzventil gemäß dem Stand der Technik in seinen wesentlichen Bauteilen kurz erläutert. Das in Fig. 1 dargestellte Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.Before the invention is described in more detail with reference to preferred embodiments, a fuel injection valve according to the prior art will be briefly explained in its essential components for better understanding. This in Fig. 1 shown fuel injection valve 1 is designed in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 umfaßt ein Gehäuse 2, in welchem ein mit einer Aktorumspritzung 3 versehener piezoelektrischer oder magnetostriktiver Aktor 4 angeordnet ist. Dem Aktor 4 kann mittels einer elektrischen Leitung 5, an welcher ein aus dem Gehäuse 2 ragender elektrischer Anschluß 6 ausgebildet sein kann, eine elektrische Spannung zugeführt werden. Der Aktor 4 stützt sich zuströmseitig an einem Aktorfuß 7 und abströmseitig an einem Aktorkopf 8 ab. Eine Vorspannfeder 9 beaufschlagt den Aktor 4 mit einer Vorspannung.The fuel injection valve 1 comprises a housing 2, in which a provided with an Aktorumspritzung 3 piezoelectric or magnetostrictive actuator 4 is arranged. The actuator 4 can by means of an electrical line 5, to which a protruding from the housing 2 electrical terminal 6 may be formed, an electrical voltage be supplied. The actuator 4 is supported on the inflow side on an actuator base 7 and downstream on an actuator head 8. A biasing spring 9 acts on the actuator 4 with a bias voltage.

Das Gehäuse 2 weist eine Bohrung 10 auf, welche der Brennstoffleitung von einem Zulaufstutzen 11 zu einem nicht weiter dargestellten Dichtsitz des Brennstoffeinspritzventils 1 dient. Die Bohrung 10 ist dabei in dem Gehäuse 2 parallel zum Aktor 4 eingebracht und zweiteilig ausgeführt. Ein erster Abschnitt 12 ist schräg in das Gehäuse 2 eingebracht und erstreckt sich vom Zulaufstutzen 11 bis zu einem zweiten Abschnitt 13, welcher sich auf seiner gesamten axialen Ausdehnung geradlinig durch das Gehäuse erstreckt. Grund für die zweiteilige Ausbildung ist die Unmöglichkeit, eine abknickende Bohrung 10 in einem Arbeitsgang kostengünstig und einfach herzustellen. Der zweite Abschnitt 13 ist zuströmseitig einer Einmündung 14 in den ersten Abschnitt 12 mit einem Verschlußkörper 15 verschlossen.The housing 2 has a bore 10, which serves the fuel line from an inlet nozzle 11 to a sealing seat of the fuel injection valve 1, not shown. The bore 10 is introduced parallel to the actuator 4 in the housing 2 and executed in two parts. A first portion 12 is inserted obliquely into the housing 2 and extends from the inlet nozzle 11 to a second portion 13, which extends in a straight line through the housing over its entire axial extent. Reason for the two-part design is the impossibility to produce a kinking hole 10 in a single operation cost and easy. The second section 13 is closed on the inflow side of a junction 14 in the first section 12 with a closure body 15.

Nachteilig an diesem Herstellungsverfahren für die Bohrung 10 zur Brennstoffleitung ist das massive Gehäuse 2, welches eine Mindestwandstärke aufweisen muß, damit eine Bohrung 10 mit ausreichendem Durchmesser eingebracht werden kann. Dadurch ist das Brennstoffeinspritzventil 1 sehr massiv. Eine entsprechende Aufnahmebohrung in einem Zylinderkopf der Brennkraftmaschine muß ebenfalls entsprechend groß sein, um das Brennstoffeinspritzventil 1 aufnehmen zu können.A disadvantage of this manufacturing method for the bore 10 to the fuel line is the massive housing 2, which must have a minimum wall thickness, so that a bore 10 can be introduced with a sufficient diameter. As a result, the fuel injection valve 1 is very solid. A corresponding receiving bore in a cylinder head of the internal combustion engine must also be correspondingly large in order to accommodate the fuel injector 1 can.

Fig. 2A und 2B zeigen in zwei zueinander senkrechten Schnittebenen entlang einer Längsachse 16 des Brennstoffeinspritzventils 1 ein erstes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1, welches über einen variabel gestaltbaren Brennstoffzulauf 17 verfügt. Fig. 2A and 2 B show in two mutually perpendicular sectional planes along a longitudinal axis 16 of the fuel injection valve 1, a first embodiment of a fuel injection valve 1 according to the invention, which has a variably modifiable fuel inlet 17.

Der Brennstoffzulauf 17 umfaßt dabei ein Rohr 18, welches in eine Bohrung 19 des Aktorfußes 7 eingeschoben und mit dem Aktorfuß 7 vorzugsweise über eine Schweißnaht 20 verbunden ist. Auf einem zuströmseitigen Ende des Rohres 18 ist ein Anschlußstutzen 21 aufgesetzt und mit dem Rohr 18 vorzugsweise ebenfalls durch eine Schweißnaht 20 verbunden. Der Anschlußstutzen 21 ist z. B. in einfacher Weise als Drehteil hergestellt.The fuel inlet 17 includes a tube 18 which is inserted into a bore 19 of the actuator base 7 and with the Actuator 7 is preferably connected via a weld 20. On an inflow end of the tube 18, a connecting piece 21 is placed and preferably also connected to the tube 18 by a weld 20. The connecting piece 21 is z. B. made in a simple manner as a turned part.

Die vormontierten Bauteile 7, 18 und 21 sind mit einer Kunststoffumspritzung 22 versehen, an welche im Ausführungsbeispiel der elektrische Anschluß 6 angeformt ist.The pre-assembled components 7, 18 and 21 are provided with a Kunststoffumspritzung 22, to which in the embodiment of the electrical connection 6 is formed.

Der durch den Anschlußstutzen 21 zugeführte Brennstoff wird durch das Rohr 18 und die Bohrung 19 im Aktorfuß 7 geleitet. Radiale Bohrungen 23 im Aktorfuß 7 leiten den Brennstoff in einen Innenraum 24 des Brennstoffeinspritzventils 1. Der Brennstoff umströmt eine Aktorpatrone 25, in welcher der mit der Aktorumspritzung 3 versehene Aktor 2 gemeinsam mit dem Aktorkopf 8 und der Vorspannfeder 9 gekapselt ist. Die Aktorpatrone 25 ist mit dem Aktorfuß 7 über eine weitere Schweißnaht 20 abströmseitig der radialen Bohrungen 23 verbunden, ebenso, wie das Gehäuse 2 des Brennstoffeinspritzventils 1 mit diesem zuströmseitig über eine Schweißnaht 20 verbunden ist. Labyrinthdichtungen 35 sorgen für die Abdichtung zwischen der Kunststoffumspritzung 22 und dem Aktorfuß 7 sowie mit dem Anschlußstutzen 21. Die Aktorpatrone 25 ist mittels einer Dichtung 26, welche beispielsweise als Wellrohrdichtung 26 ausgeführt sein kann, gegen den Brennstoff abgedichtet. Das Gehäuse 2 des Brennstoffeinspritzventils 1 ist vorteilhafterweise einteilig ausgebildet.The supplied through the connecting piece 21 fuel is passed through the pipe 18 and the bore 19 in the actuator base 7. Radial bores 23 in the actuator base 7 lead the fuel into an interior 24 of the fuel injection valve 1. The fuel flows around an actuator cartridge 25, in which the actuator 2 provided with the actuator 3 is encapsulated together with the actuator head 8 and the biasing spring 9. The actuator cartridge 25 is connected to the actuator base 7 via a further weld 20 downstream of the radial bores 23, as well as the housing 2 of the fuel injection valve 1 is connected to this inflow side via a weld 20. Labyrinth seals 35 provide the seal between the plastic extrusion 22 and the actuator base 7 and with the connecting piece 21. The actuator cartridge 25 is sealed by a seal 26, which may be 26, for example, as a corrugated pipe seal against the fuel. The housing 2 of the fuel injection valve 1 is advantageously formed in one piece.

Der Vorteil einer Brennstoffzufuhr 17 wie in Fig. 2A dargestellt ist insbesondere die Möglichkeit, die Brennstoffzufuhr an individuelle Einbausituationen durch einen modularen Aufbau ohne großen Aufwand anpassen zu können. Auch der Wegfall einer Tieflochbohrung und die damit verbundene hohe Wandstärke des Gehäuses sind vorteilhaft. Das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil 1 ist bedingt durch das dünnwandige Gehäuse 2 schlank und benötigt daher nicht viel Einbauraum. Der Querschnitt des Rohres 18 kann so gewählt werden, daß Druckpulsationen im Brennstoffeinspritzventil 1 vermieden und die Zumeßdynamik verbessert werden können. Die Kunststoffumspritsung 22 ist variabel formbar und kann den Steckanschluß 6 sowie weitere Befestigungselemente umfassen.The advantage of a fuel supply 17 as in Fig. 2A in particular, the possibility of being able to adapt the fuel supply to individual installation situations by means of a modular construction without great effort is shown. The elimination of a deep hole and the associated high wall thickness of the housing are advantageous. The inventively designed fuel injector 1 is due to the thin-walled housing 2 slim and therefore does not require much installation space. The cross-section of the tube 18 can be chosen so that pressure pulsations in the fuel injector 1 can be avoided and the metering dynamics can be improved. The Kunststoffumspritsung 22 is variably formable and may include the plug connection 6 and other fasteners.

Das Brennstoffeinspritzventil 1 verfügt abströmseitig der Aktorpatrone 25 über ein Betätigungselement 27 für eine Ventilnadel 28, welche an ihrem abströmseitigen Ende einen Ventilschließkörper 29 umfaßt, der mit einer am Gehäuse 2 ausgebildeten Ventilsitzfläche 30 einen Dichtsitz bildet. Ein Führungselement 31 mit Brennstoffkanälen 32 zentriert die Ventilnadel 28 im Innenraum 24 des Brennstoffeinspritzventils 1. Eine Rückstellfeder 33 hält das Brennstoffeinspritzventil 1, welches im vorliegenden Ausführungsbeispiel als nach außen öffnendes Brennstoffeinspritzventil 1 ausgebildet ist, in unbelastetem Zustand des Aktors 4 geschlossen und sorgt nach Abschalten der Erregerspannung für die Rückstellung der Ventilnadel 28.The fuel injection valve 1 has the downstream side of the actuator cartridge 25 via an actuating element 27 for a valve needle 28, which comprises at its downstream end a valve closing body 29 which forms a sealing seat with a formed on the housing 2 valve seat surface 30. A return element 33 holds the fuel injection valve 1, which is formed in the present embodiment as an outwardly opening fuel injector 1, closed in the unloaded state of the actuator 4 and ensures after switching off the Excitation voltage for the return of the valve needle 28th

Fig. 2B zeigt zur Verdeutlichung der erfindungsgemäßen Maßnahmen einen weiteren Schnitt durch das in Fig. 2A dargestellte Brennstoffeinspritzventil 1 entlang der Linie IIB-IIB in Fig. 2A. Fig. 2B shows to illustrate the measures according to the invention a further section through the in Fig. 2A illustrated fuel injector 1 along the line IIB-IIB in Fig. 2A ,

Der Aktorfuß weist neben den radialen Bohrungen 23 zumindest eine, im Ausführungsbeispiel zwei axiale Bohrungen 34 auf, welche nach der Montage der Aktorpatrone 25 und vor der Umspritzung des Brennstoffzulaufs 17 zur Einbringung der Aktorumspritzung 3 dienen können. Diese erfüllt hauptsächlich die Aufgabe der Wärmeableitung vom Aktor 2.The actuator base has, in addition to the radial bores 23, at least one, in the exemplary embodiment, two axial bores 34, which can serve to introduce the actuator encapsulation 3 after the assembly of the actuator cartridge 25 and before the encapsulation of the fuel inlet 17. This mainly fulfills the task of heat dissipation from the actuator 2.

Fig. 3A zeigt ein nicht erfindungsgemäßes Brennstoffeinspritzventil. Fig. 3A shows a non-inventive fuel injection valve.

Fig. 3B bis 3C zeigen weitere vorteilhafte Ausführungsvarianten eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Gleiche Bauteile sind in allen Figuren mit übereinstimmenden Bezugszeichen versehen. Fig. 3B to 3C show further advantageous embodiments of an inventively designed fuel injector 1. The same components are provided in all figures with corresponding reference numerals.

Fig. 3A zeigt ein nicht erfindungsgemäßes Bremmstoffeinspritzventil, in welcher der Anschlußstutzen 21, das Rohr 18 und der Aktorfuß 7 als einteiliges Drehteil ausgebildet sind. Dadurch können zwei der in Fig. 2A und 2B dargestellten Schweißnähte 20 zwischen Anschlußstutzen 21 und Rohr 18 sowie zwischen Rohr 18 und Aktorfuß 7 entfallen. Nachteilig ist hierbei gegenüber der einzelnen Herstellung der genannten Bauteile die lange Drehzeit für das mit mehreren Absätzen und den Labyrinthdichtungen 35 versehene Drehteil. Fig. 3A shows a Bremmstoffeinspritzventil not according to the invention, in which the connecting piece 21, the tube 18 and the actuator base 7 are formed as a one-piece rotary member. This allows two of the Fig. 2A and 2 B illustrated welds 20 between the connecting piece 21 and pipe 18 and between the pipe 18 and actuator foot 7 omitted. The disadvantage here is compared to the individual production of said components, the long rotation time for the provided with several paragraphs and the labyrinth seals 35 rotary member.

Fig. 3B zeigt eine gegenüber Fig. 3A leicht abgewandelte erfindungsgemäße Variante, welche die Vorteile einer entfallenden Schweißnaht 20 mit einfacher Herstellbarkeit zweier miteinander zu kombinierender Bauteile verbindet. Ein erster Rohrabschnitt 36 des Rohrs 18 und der Anschlußstutzen 21 sind einteilig durch Drehen hergestellt und mittels einer Schweißnaht 20 mit einem zweiten Rohrabschnitt 37 des Rohrs 18 verbunden, welcher wiederum einstückig mit dem Aktorfuß 7 durch Drehen hergestellt ist. Fig. 3B shows one opposite Fig. 3A slightly modified variant of the invention, which combines the advantages of a waiving weld 20 with ease of manufacture of two components to be combined together. A first pipe section 36 of the pipe 18 and the connecting piece 21 are made in one piece by turning and connected by a weld 20 with a second pipe section 37 of the tube 18, which in turn is made in one piece with the actuator base 7 by turning.

In Fig. 3C ist der Brennstoffzulauf 17 ebenfalls wie in Fig. 3B zweiteilig ausgebildet, wobei das abströmseitige Bauteil aus Aktorfuß 7 und zweitem Rohrabschnitt 37 identisch zu Fig. 3B ausgeführt sein kann, der ersten Rohrabschnitt 36 jedoch als Tiefziehteil mit angeformtem Kragen 38 ausgebildet und mit dem zweiten Rohrabschnitt 37 ebenfalls über eine Schweißnaht 20 verbunden ist.In Fig. 3C the fuel feed 17 is also as in Fig. 3B formed in two parts, wherein the downstream component of Aktorfuß 7 and second pipe section 37 identical to Fig. 3B may be executed, the first pipe section 36, however, formed as a deep-drawn part with integrally formed collar 38 and also connected to the second pipe section 37 via a weld 20.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Bauformen von Brennstoffeinspritzventilen 1 geeignet entsprechend dem Gegenstand der beigefügten Ansprüche.The invention is not limited to the illustrated embodiments and suitable for any designs of fuel injectors 1 according to the subject of the appended claims.

Claims (18)

  1. Fuel injection valve (1), in particular fuel injection valve (1) for fuel injection systems of internal combustion engines, having a piezoelectric or magnetostrictive actuator (4) which actuates a valve closing body (29) which is arranged in a housing (2) and interacts with a valve seat surface (30) to form a sealing seat, and having a fuel inlet (17), with the fuel inlet (17) having a connecting pipe stub (21) and a pipe (18) which are fitted onto an actuator base (7) of the actuator (4) and are encased with a plastic injection-moulded encapsulation (22),
    characterized
    in that the pipe (18) is pushed into a bore (19) in the actuator base (7).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the pipe (18) is connected to the actuator base (7) by means of a weld seam (20).
  3. Fuel injection valve according to Claim 1 or 2,
    characterized
    in that the pipe (18) and the connecting pipe stub (21) are connected to one another by means of a weld seam (20).
  4. Fuel injection valve according to one of Claims 1 to 3,
    characterized
    in that at least one radial bore (23) is provided in the actuator base (7).
  5. Fuel injection valve according to Claim 4,
    characterized
    in that the pipe (18) is connected to an interior space (24) of the fuel injection valve (1) by means of the at least one radial bore (23).
  6. Fuel injection valve according to one of Claims 1 to 5,
    characterized
    in that the actuator (4) is encapsulated in an actuator cartridge (25).
  7. Fuel injection valve according to Claim 6,
    characterized
    in that the actuator base (7) has at least one axial bore (34).
  8. Fuel injection valve according to Claim 7,
    characterized
    in that the actuator cartridge (25) can be filled with an actuator injection-moulded encapsulation (3) through the at least one axial bore (34) in the actuator base (7).
  9. Fuel injection valve according to Claim 1 to 8,
    characterized
    in that the fuel inlet (17) is produced by turning.
  10. Fuel injection valve according to one of Claims 1 to 9,
    characterized
    in that the fuel inlet (17) formed by the actuator base (7), the pipe (18) and the connecting pipe stub (21) is formed in two parts.
  11. Fuel injection valve according to Claim 10,
    characterized
    in that a first pipe section (36) is formed in one piece with the connecting pipe stub (21).
  12. Fuel injection valve according to Claim 11,
    characterized
    in that the first pipe section (36) and the connecting pipe stub (21) are produced by turning.
  13. Fuel injection valve according to Claim 11,
    characterized
    in that the first pipe section (36) and the connecting pipe stub (21) are produced as a deep-drawn part.
  14. Fuel injection valve according to Claim 13,
    characterized
    in that the deep-drawn connecting pipe stub (21) has an integrally formed collar (38).
  15. Fuel injection valve according to one of Claims 11 to 14,
    characterized
    in that the first pipe section (36) and the second pipe section (37) are connected to one another by means of a weld seam (20).
  16. Fuel injection valve according to one of Claims 1 to 15,
    characterized
    in that the actuator base (7) is connected to the housing (2) by means of a weld seam (20).
  17. Fuel injection valve according to one of Claims 6 to 8,
    characterized
    in that the actuator cartridge (25) is connected to the actuator base (7) by means of a weld seam (20).
  18. Fuel injection valve according to one of Claims 1 to 17,
    characterized
    in that labyrinth seals (35) are provided between the plastic injection-moulded encapsulation (22) and the actuator base (7) and also between the plastic injection-moulded encapsulation (22) and the connecting pipe stub (21).
EP04704534A 2003-03-12 2004-01-23 Fuel injection valve Expired - Lifetime EP1606508B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2003110789 DE10310789A1 (en) 2003-03-12 2003-03-12 Fuel injection valve for IC engine fuel injection system has fuel feed with connection point and pipe extending to foot of actuator for movement of valve closure relative to valve seat surface
DE10310789 2003-03-12
PCT/DE2004/000099 WO2004081368A1 (en) 2003-03-12 2004-01-23 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1606508A1 EP1606508A1 (en) 2005-12-21
EP1606508B1 true EP1606508B1 (en) 2009-12-30

Family

ID=32892080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04704534A Expired - Lifetime EP1606508B1 (en) 2003-03-12 2004-01-23 Fuel injection valve

Country Status (3)

Country Link
EP (1) EP1606508B1 (en)
DE (2) DE10310789A1 (en)
WO (1) WO2004081368A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005015256A1 (en) * 2005-04-04 2006-10-05 Robert Bosch Gmbh Piezoelectric actuator with labyrinth seal for use in fuel injection valve, has plastic sealing formed with projections that are inserted and completely fill circulating grooves formed on head or base portion of piezoelectric component
DE102005033138B4 (en) * 2005-07-15 2017-12-14 Robert Bosch Gmbh Fuel injector
DE102005040199A1 (en) * 2005-08-25 2007-03-01 Robert Bosch Gmbh Piezo actuator with plug device and a method for its production
DE102007040509A1 (en) 2007-08-28 2009-03-05 Robert Bosch Gmbh Piezoelectric actuator with a sheath of the piezoelectric actuator and a method for its production
DE102008008847A1 (en) * 2008-02-13 2009-08-27 Robert Bosch Gmbh Fuel injector with a directly controlled valve needle
DE102012204302A1 (en) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Overmolded component with a sealing labyrinth
DE102020213842A1 (en) 2020-11-04 2022-05-05 Robert Bosch Gesellschaft mit beschränkter Haftung Injection valve for a water injection system of an internal combustion engine and water injection system with such an injection valve

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Publication number Priority date Publication date Assignee Title
DE3533085A1 (en) 1985-09-17 1987-03-26 Bosch Gmbh Robert METERING VALVE FOR DOSING LIQUIDS OR GASES
US5494225A (en) * 1994-08-18 1996-02-27 Siemens Automotive Corporation Shell component to protect injector from corrosion
DE19503821A1 (en) * 1995-02-06 1996-08-08 Bosch Gmbh Robert Electromagnetically actuated valve
DE19534445C2 (en) * 1995-09-16 1998-07-30 Man Nutzfahrzeuge Ag Injection valve for internal combustion engines
US5820099A (en) * 1997-05-20 1998-10-13 Siemens Automotive Corporation Fluid migration inhibitor for fuel injectors
DE19827136A1 (en) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Fuel injector
DE19843570A1 (en) * 1998-09-23 2000-03-30 Bosch Gmbh Robert Fuel injector
DE19912665A1 (en) * 1999-03-20 2000-09-21 Bosch Gmbh Robert Fuel injector
DE19932760A1 (en) * 1999-07-14 2001-01-18 Bosch Gmbh Robert Fuel injector
JP2002319715A (en) * 2001-04-19 2002-10-31 Denso Corp Piezoelectric element and injector using the same

Also Published As

Publication number Publication date
WO2004081368A1 (en) 2004-09-23
EP1606508A1 (en) 2005-12-21
DE502004010587D1 (en) 2010-02-11
DE10310789A1 (en) 2004-09-23

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