EP1606509A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1606509A1
EP1606509A1 EP04704537A EP04704537A EP1606509A1 EP 1606509 A1 EP1606509 A1 EP 1606509A1 EP 04704537 A EP04704537 A EP 04704537A EP 04704537 A EP04704537 A EP 04704537A EP 1606509 A1 EP1606509 A1 EP 1606509A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
actuator
valve according
valve
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
EP04704537A
Other languages
German (de)
French (fr)
Other versions
EP1606509B1 (en
Inventor
Hubert Stier
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 EP1606509A1 publication Critical patent/EP1606509A1/en
Application granted granted Critical
Publication of EP1606509B1 publication Critical patent/EP1606509B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a metering valve for metering 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 of which when an excitation voltage is applied is transmitted to a valve needle controlling a feed opening and determines the stroke of the valve needle.
  • the substance to be measured is fed via a feed line, which is designed in the form of a deep hole in the valve body.
  • a disadvantage of the metering valve known from DE 35 33 085 AI is the floating mounting of the hydraulic coupler between the fuel inlet and the actuator, as a result of which the coupler is exposed to fluctuations in the fuel pressure.
  • the electrical lines required to make contact with the actuator have to be laid in a complex manner in order not to be stressed by the changes in position.
  • the cables have to be laid around the coupler, which makes them both longer and more installation space claim. This makes the valve housing bulky and in turn requires a larger installation space in the cylinder head.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the hydraulic coupler is fixed between the actuator and a valve group, so that the electrical contacting of the actuator does not have to take place past the actuator and length changes caused by changes in the position of the coupler are eliminated.
  • the actuator is advantageously firmly connected to the valve housing, as a result of which a stationary relative position of the actuator with respect to the housing is achieved.
  • the electrical lines run through bores in an actuator base and are fixed and protected by plastic encapsulation.
  • the plug in which the electrical lines are arranged, is advantageously molded onto the plastic encapsulation.
  • the coupler advantageously acts on the valve needle via a spherical cap, so that offsets can be compensated for.
  • FIG. 1 shows a schematic section through an exemplary embodiment of a fuel injection valve according to the invention along a sectional plane
  • FIG. 2 shows a schematic section through the exemplary embodiment of a fuel injector according to the invention shown in FIG. 1 along a second sectional plane
  • FIGS. 1 and 2 shows a detail of the pivotable mounting of the coupler between the actuator and the valve needle of the fuel injector according to the invention shown in FIGS. 1 and 2.
  • a fuel injector 1 shown in FIGS. 1 and 2 in two mutually perpendicular sectional views along a longitudinal axis is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited
  • Fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
  • the fuel injector 1 comprises a housing 2, in which one is provided with an actuator coating 3 piezoelectric or magnetostrictive actuator 4 is arranged.
  • the actuator 4 is preloaded by a tubular spring 5 in order to enable non-destructive assembly and a reproducible actuation of the actuator 4.
  • An electrical voltage can be supplied to the actuator 4 by means of an electrical line 6.
  • the actuator 4 is supported on the inflow side on an actuator base 7 and on the outflow side on an actuator head 8.
  • the actuator 4 is encapsulated in an actuator housing 9.
  • the fuel injection valve 1 has a hydraulic coupler 10 on the downstream side of the actuator 4, which is mounted without pressure between the actuator 4 and a valve module 11.
  • the hydraulic coupler 10 is designed as a second medium coupler 10 and comprises a master piston 12 and a slave piston 13, which are urged against one another by a coupler spring 14.
  • the hydraulic coupler 10 is sealed against an interior 16 of the fuel injector 1 by a corrugated-tube seal 15, for example.
  • the slave piston 13 of the hydraulic coupler 10 rests on a calotte 17 which interacts with a valve needle 19 via an actuating element 18.
  • the calotte 17 compensates for offsets of the valve needle 19 during the operation of the fuel injector 1.
  • the valve needle 19 has a valve closing body 20 at its downstream end, which cooperates with a valve seat surface 21 to form a sealing seat.
  • the fuel injection valve 1 opens outward.
  • the actuator 4 Due to the fact that the actuator 4 is not floating, but is fixedly mounted, it is possible to achieve a fixed thermal connection of the actuator 4 to the housing 2, as a result of which a gap between the actuator 4 and the housing 2 can be eliminated. As a result, the temperature of the actuator 4 can be reduced by better heat dissipation. In addition, the fixed mounting of the actuator 2 can move Cable routing between the actuator 4 and the electrical plug contact 6 along the coupler 10 is eliminated.
  • the electrical line 6 passes through the actuator base 7 through bores 22 which are formed in the actuator base 7. Because the hydraulic coupler 10 is arranged on the downstream side of the actuator 4, the electrical lines 6 can be laid on the actuator 4 shorter and without movement-compensating cable guides.
  • the valve housing 2 can be slimmer because the electrical lines 6 do not have to be routed around the hydraulic coupler 10.
  • the fuel is supplied via a central inlet connection 23, in which a filter 24 can be arranged.
  • the fuel is conducted to the sealing seat via bores 25 and a gap 26 formed between the actuator housing 9 and the valve housing 2.
  • the inlet connection 23 is provided in FIG. 2 with a plastic encapsulation 27, on which a plug 28 for the electrical lines 6 is molded.
  • 3A and 3B show detailed views of the plug 28 in a view of the fuel injection valve 1 in the outflow direction of the fuel.
  • the fuel injector 1 is shown without plastic encapsulation 27 as in FIG. 1.
  • the electrical lines 6 are led straight and straight into the actuator base 7 and run parallel to the bore 25 through which the fuel is supplied from the inlet connection 23.
  • Fig. 3B the connector 28 is shown after the encapsulation of the inlet connector 23 with plastic 27 in the same view.
  • the plastic encapsulation 27 and the plug 28 can be produced simply and inexpensively in one process step.
  • the electrical lines 6 are through the plastic encapsulation 27 at the inlet connection 23 and fixed to the actuator foot 7 and protected from damage.
  • the coupler 10 is pivotably mounted between the actuator head 8 and valve needle 19 by means of a spherical cap 17.
  • the cap 17 is arranged in FIGS. 1 and 2 between the hydraulic coupler 10 and an actuating element 18, which is in operative connection with the valve needle 19.
  • the invention is not restricted to the exemplary embodiment shown and is suitable for any designs of fuel injection valves 1.

Landscapes

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

Abstract

The invention relates to a fuel injection valve (1), particularly a fuel injection valve (1) for fuel injection systems of internal combustion engines, comprising a piezoelectric or magnetostrictive actuator (4), which can be excited via an electrical lead (6) and which actuates a valve closing body (20) situated inside a housing (2). This valve closing body interacts with a valve seating surface (21) to form a sealing seat. The fuel injection valve also comprises a hydraulic coupler (10). The hydraulic coupler (10) is mounted in a fixed manner between the actuator (4) and a valve subassembly (11) comprising the valve seating surface (21).

Description

Brennetoffeinspritzventil Brennetoffeinspritzventil
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.
Aus der DE 35 33 085 AI 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 Zu eßöffnung 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 DE 35 33 085 AI a metering valve for metering liquids or gases, in particular an injection valve for fuel injection systems in internal combustion engines, is known, which has a piezo stack actuator, the change in length of which when an excitation voltage is applied is transmitted to a valve needle controlling a feed opening and determines the stroke of the valve needle. The substance to be measured is fed via a feed line, which is designed in the form of a deep hole in the valve body.
Nachteilig an dem aus der DE 35 33 085 AI bekannten Zumeßventil ist die schwimmende Lagerung des hydraulischen Kopplers zwischen BrennstoffZulauf und Aktor, wodurch der Koppler Schwankungen im Brennstoffdruck ausgesetzt ist. Die zur Kontaktierung des Aktors benötigten elektrischen Leitungen müssen aufwendig verlegt werden, um nicht durch die Lageänderungen auf Zug beansprucht zu werden. Zudem müssen die Leitungen um den Koppler herum verlegt werden, wodurch sie sowohl länger werden als auch mehr Einbauraum beanspruchen. Das Ventilgehäuse wird dadurch voluminös und beansprucht seinerseits einen größeren Einbauraum im Zylinderkopf.A disadvantage of the metering valve known from DE 35 33 085 AI is the floating mounting of the hydraulic coupler between the fuel inlet and the actuator, as a result of which the coupler is exposed to fluctuations in the fuel pressure. The electrical lines required to make contact with the actuator have to be laid in a complex manner in order not to be stressed by the changes in position. In addition, the cables have to be laid around the coupler, which makes them both longer and more installation space claim. This makes the valve housing bulky and in turn requires a larger installation space in the cylinder head.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der hydraulische Koppler fest zwischen dem Aktor und einer Ventilgruppe angeordnet ist, so daß die elektrische Kontaktierung des Aktors nicht am Aktor vorbei erfolgen muß und durch Lageänderungen des Kopplers verursachte Längenänderungen entfallen.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that the hydraulic coupler is fixed between the actuator and a valve group, so that the electrical contacting of the actuator does not have to take place past the actuator and length changes caused by changes in the position of the coupler are eliminated.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the subclaims allow advantageous further developments of the fuel injector specified in the main claim.
Vorteilhafterweise ist der Aktor fest mit dem Ventilgehäuse verbunden, wodurch eine ortsfeste relative Lage des Aktors bezüglich des Gehäuses erzielt wird.The actuator is advantageously firmly connected to the valve housing, as a result of which a stationary relative position of the actuator with respect to the housing is achieved.
Von Vorteil ist außerdem, daß die elektrischen Leitungen durch Bohrungen in einem Aktorfuß verlaufen und durch eine Kunststoffumspritzung fixiert und geschützt sind.It is also advantageous that the electrical lines run through bores in an actuator base and are fixed and protected by plastic encapsulation.
Vorteilhafterweise ist der Stecker, in welchem die elektrischen Leitungen angeordnet sind, an der Kunststoffumspritzung angeformt.The plug, in which the electrical lines are arranged, is advantageously molded onto the plastic encapsulation.
Der Koppler wirkt vorteilhafterweise über eine Kalotte auf die Ventilnadel ein, so daß Versätze ausgeglichen werden können .The coupler advantageously acts on the valve needle via a spherical cap, so that offsets can be compensated for.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: Fig. 1 einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils entlang einer •-rsr.en Schnittebene,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 shows a schematic section through an exemplary embodiment of a fuel injection valve according to the invention along a sectional plane,
Fig. 2 einen schematischen Schnitt durch das in Fig. 1 dargestellte Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils entlang einer zweiten Schnittebene,2 shows a schematic section through the exemplary embodiment of a fuel injector according to the invention shown in FIG. 1 along a second sectional plane,
Fig. 3A-B Ansichten des Steckkontaktes des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils ohne und mit Kunststoffumspritzung, und3A-B views of the plug contact of the fuel injector designed according to the invention without and with plastic extrusion, and
Fig. 4 eine ausschnittsweise Darstellung der schwenkbaren Lagerung des Kopplers zwischen Aktor und Ventilnadel des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils gemäß Fig. 1 und 2.4 shows a detail of the pivotable mounting of the coupler between the actuator and the valve needle of the fuel injector according to the invention shown in FIGS. 1 and 2.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.A preferred exemplary embodiment of the invention is described below by way of example. Matching components are provided with matching reference numerals in all figures.
Ein in den Fig. 1 und 2 in zwei zueinander senkrechten Schnittansichten entlang einer Längsachse dargestelltes Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündetenA fuel injector 1 shown in FIGS. 1 and 2 in two mutually perpendicular sectional views along a longitudinal axis is in the form of a fuel injector 1 for fuel injection systems of mixture-compressing, spark-ignited
Brennkraftmaschinen ausgeführt. DasRunning internal combustion engines. The
Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.Fuel injection valve 1 is particularly suitable for injecting fuel directly 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. Der Aktor 4 ist durch eine Rohrfeder 5 vorgespannt, um eine zerstörungsfreie Montage und eine reproduzierbare Betätigung des Aktors 4 zu ermöglichen. Dem Aktor 4 kann mittels einer elektrischen Leitung 6 eine elektrische Spannung zugeführt werden. Der Aktor 4 stützt sich zuströmseitig an einem Aktorfuß 7 und abströmseitig an einem Aktorkopf 8 ab. Der Aktor 4 ist in einem Aktorgehäuse 9 gekapselt .The fuel injector 1 comprises a housing 2, in which one is provided with an actuator coating 3 piezoelectric or magnetostrictive actuator 4 is arranged. The actuator 4 is preloaded by a tubular spring 5 in order to enable non-destructive assembly and a reproducible actuation of the actuator 4. An electrical voltage can be supplied to the actuator 4 by means of an electrical line 6. The actuator 4 is supported on the inflow side on an actuator base 7 and on the outflow side on an actuator head 8. The actuator 4 is encapsulated in an actuator housing 9.
Erfindungsgemäß weist das Brennstoffeinspritzventil 1 abströmseitig des Aktors 4 einen hydraulischen Koppler 10 auf, welcher drucklos zwischen dem Aktor 4 und einem Ventilmodul 11 gelagert ist. Der hydraulische Koppler 10 ist als Zweitmediumskoppler 10 ausgebildet und umfaßt einen Geberkolben 12 und einen Nehmerkolben 13, die durch eine Kopplerfeder 14 gegeneinander beaufschlagt sind. Der hydraulische Koppler 10 ist durch eine beispielsweise wellröhrförmige Dichtung 15 gegen einen Innenraum 16 des Brennstoffeinspritzventils 1 abgedichtet.According to the invention, the fuel injection valve 1 has a hydraulic coupler 10 on the downstream side of the actuator 4, which is mounted without pressure between the actuator 4 and a valve module 11. The hydraulic coupler 10 is designed as a second medium coupler 10 and comprises a master piston 12 and a slave piston 13, which are urged against one another by a coupler spring 14. The hydraulic coupler 10 is sealed against an interior 16 of the fuel injector 1 by a corrugated-tube seal 15, for example.
Der Nehmerkolben 13 des hydraulischen Kopplers 10 liegt an einer Kalotte 17 an, die über ein Betätigungselement 18 mit einer Ventilnadel 19 zusammenwirkt. Die Kalotte 17 sorgt für den Ausgleich von Versätzen der Ventilnadel 19 während des Betriebs des Brennstoffeinspritzventils 1. Die Ventilnadel 19 weist an ihrem abströmseitigen Ende einen Ventilschließkörper 20 auf, der mit einer Ventilsitzfläche 21 zu einem Dichtsitz zusammenwirkt. Im Ausführungsbeispiel handelt es sich um ein nach außen öffnendes Brennstoffeinspritzventil 1.The slave piston 13 of the hydraulic coupler 10 rests on a calotte 17 which interacts with a valve needle 19 via an actuating element 18. The calotte 17 compensates for offsets of the valve needle 19 during the operation of the fuel injector 1. The valve needle 19 has a valve closing body 20 at its downstream end, which cooperates with a valve seat surface 21 to form a sealing seat. In the exemplary embodiment, the fuel injection valve 1 opens outward.
Bedingt dadurch, daß der Aktor 4 nicht schwimmend, sondern fest gelagert ist, ist es möglich, eine feste thermische Anbindung des Aktors 4 an das Gehäuse 2 zu erreichen, wodurch ein Spalt zwischen dem Aktor 4 und dem Gehäuse 2 entfallen kann. Dadurch kann die Temperatur des Aktors 4 durch bessere Wärmeableitung gesenkt werden. Zudem können durch die feste Lagerung des Aktors 2 bewegliche Kabelführungen zwischen dem Aktor 4 und dem elektrischen Steckkontakt 6 entlang des Kopplers 10 entfallen.Due to the fact that the actuator 4 is not floating, but is fixedly mounted, it is possible to achieve a fixed thermal connection of the actuator 4 to the housing 2, as a result of which a gap between the actuator 4 and the housing 2 can be eliminated. As a result, the temperature of the actuator 4 can be reduced by better heat dissipation. In addition, the fixed mounting of the actuator 2 can move Cable routing between the actuator 4 and the electrical plug contact 6 along the coupler 10 is eliminated.
Die elektrische Leitung 6 durchgreift den Aktorfuß 7 durch Bohrungen 22, die in dem Aktorfuß 7 ausgebildet sind. Dadurch, daß der hydraulische Koppler 10 abströmseitig des Aktors 4 angeordnet ist, können die elektrischen Leitungen 6 kürzer und ohne bewegungskompensierende Kabelführungen am Aktor 4 verlegt werden. Das Ventilgehäuse 2 kann dadurch schlanker ausfallen, da die elektrischen Leitungen 6 nicht um den hydraulischen Koppler 10 herumgeführt werden müssen.The electrical line 6 passes through the actuator base 7 through bores 22 which are formed in the actuator base 7. Because the hydraulic coupler 10 is arranged on the downstream side of the actuator 4, the electrical lines 6 can be laid on the actuator 4 shorter and without movement-compensating cable guides. The valve housing 2 can be slimmer because the electrical lines 6 do not have to be routed around the hydraulic coupler 10.
Die BrennstoffZuleitung erfolgt über einen zentralen Zulaufstutzen 23, in welchem ein Filter 24 angeordnet sein kann. Über Bohrungen 25 und einen zwischen dem Aktorgehäuse 9 und dem Ventilgehäuse 2 ausgebildeten Spalt 26 wird der Brennstoff zum Dichtsitz geleitet. Der Zulaufstutzen 23 ist in Fig. 2 mit einer Kunststoffumspritzung 27 versehen, an welcher ein Stecker 28 für die elektrischen Leitungen 6 angeformt ist.The fuel is supplied via a central inlet connection 23, in which a filter 24 can be arranged. The fuel is conducted to the sealing seat via bores 25 and a gap 26 formed between the actuator housing 9 and the valve housing 2. The inlet connection 23 is provided in FIG. 2 with a plastic encapsulation 27, on which a plug 28 for the electrical lines 6 is molded.
Die Fig. 3A und 3B zeigen Detailansichten des Steckers 28 in Aufsicht auf das Brennstoffeinspritzventil 1 in Abströmrichtung des Brennstoffs.3A and 3B show detailed views of the plug 28 in a view of the fuel injection valve 1 in the outflow direction of the fuel.
In Fig. 3A ist dabei das Brennstoffeinspritzventil 1 ohne Kunststoffumspritzung 27 wie in Fig. 1 dargestellt. Die elektrischen Leitungen 6 werden direkt und gerade in den Aktorfuß 7 geführt und verlaufen parallel zu der Bohrung 25, durch welche der Brennstoff vom Zulaufstutzen 23 zugeleitet wird .In FIG. 3A, the fuel injector 1 is shown without plastic encapsulation 27 as in FIG. 1. The electrical lines 6 are led straight and straight into the actuator base 7 and run parallel to the bore 25 through which the fuel is supplied from the inlet connection 23.
In Fig. 3B ist in gleicher Ansicht der Stecker 28 nach der Umspritzung des ZulaufStutzens 23 mit Kunststoff 27 dargestellt. Die Kunststoffumspritzung 27 und der Stecker 28 sind dabei in einem Verfahrensschritt einfach und kostengünstig herstellbar. Die elektrischen Leitungen 6 werden durch die Kunststoffumspritzung 27 am Zulaufstutzen 23 und am Aktorfuß 7 fixiert und vor Beschädigungen geschützt.In Fig. 3B, the connector 28 is shown after the encapsulation of the inlet connector 23 with plastic 27 in the same view. The plastic encapsulation 27 and the plug 28 can be produced simply and inexpensively in one process step. The electrical lines 6 are through the plastic encapsulation 27 at the inlet connection 23 and fixed to the actuator foot 7 and protected from damage.
Wie bereits aus Fig. 1 und 2 hervorgehend ist der Koppler 10 zwischen dem Aktorkopf 8 und Ventilnadel 19 mittels einer Kalotte 17 schwenkbar gelagert. Die Kalotte 17 ist dabei in Fig. 1 und 2 zwischen dem hydraulischen Koppler 10 und einem Betätigungselement 18, welches mit der Ventilnadel 19 in Wirkverbindung steht, angeordnet.As already apparent from FIGS. 1 and 2, the coupler 10 is pivotably mounted between the actuator head 8 and valve needle 19 by means of a spherical cap 17. The cap 17 is arranged in FIGS. 1 and 2 between the hydraulic coupler 10 and an actuating element 18, which is in operative connection with the valve needle 19.
In Fig. 4 ist eine weitere Möglichkeit der Anordnung der Kalotte 17 zwischen dem hydraulischen Koppler 10 und dem Aktorkopf 8 dargestellt. Beide Möglichkeiten sorgen für den Ausgleich von Versätzen der Ventilnadel 19 beim Betrieb des Brennstoffeinspritzventils 1, welche sonst zu Fehlfunktionen des Brennstoffeinspritzventils 1 durch Verklemmen der Ventilnadel 19 oder durch Zerstörung des Aktors 4 durch Scherkräfte bei Versätzen führen können.4 shows a further possibility of arranging the cap 17 between the hydraulic coupler 10 and the actuator head 8. Both options ensure the compensation of offsets of the valve needle 19 during operation of the fuel injector 1, which can otherwise lead to malfunctions of the fuel injector 1 by jamming the valve needle 19 or by destruction of the actuator 4 due to shear forces in the event of offsets.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und für beliebige Bauformen von Brennstoffeinspritzventilen 1 geeignet. The invention is not restricted to the exemplary embodiment shown and is suitable for any designs of fuel injection valves 1.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1), insbesondere Brennstoffeinspritzventil (1) für Brennstoffeinspritzanlagen von Brennkraftmaschinen, mit einem über zumindest eine elektrische Leitung (6) erregbaren piezoelektrischen oder magnetostriktiven Aktor (4), der einen in einem Gehäuse (2) angeordneten Ventilschließkörper (20) betätigt, der mit einer Ventilsitzfläche (21) zu einem Dichtsitz zusammenwirkt, und mit einem hydraulischen Koppler (10) , dadurch gekennzeichnet, daß der hydraulische Koppler (10) ortsfest zwischen dem Aktor (4) und einer den Ventilschließkörper (20) und die Ventilsitzfläche (21) umfassenden Ventilbaugruppe (11) angeordnet ist.1. Fuel injection valve (1), in particular fuel injection valve (1) for fuel injection systems of internal combustion engines, with a piezoelectric or magnetostrictive actuator (4) which can be excited via at least one electrical line (6) and which actuates a valve closing body (20) arranged in a housing (2) , which cooperates with a valve seat surface (21) to form a sealing seat, and with a hydraulic coupler (10), characterized in that the hydraulic coupler (10) is stationary between the actuator (4) and one of the valve closing body (20) and the valve seat surface ( 21) comprising valve assembly (11) is arranged.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß der Aktor (4) sich mit einem zuströmseitigen Ende an einem Aktorfuß (7) abstützt.2. Fuel injection valve according to claim 1, characterized in that the actuator (4) is supported with an upstream end on an actuator base (7).
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß der Aktorfuß (7) mit dem Gehäuse (2) verbunden ist.3. Fuel injection valve according to claim 2, characterized in that the actuator base (7) is connected to the housing (2).
4. Brennstoffeinspritzventil nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Aktor (4) sich mit einem abströmseitigen Ende an einem Aktorkopf (8) abstützt.4. Fuel injection valve according to claim 2 or 3, characterized in that that the actuator (4) is supported with an outflow end on an actuator head (8).
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß der Aktorkopf (7) mit dem hydraulischen Koppler (10) verbunden ist.5. Fuel injection valve according to claim 4, characterized in that the actuator head (7) with the hydraulic coupler (10) is connected.
6. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, daß der hydraulische Koppler (10) auf dem Aktorkopf (8) mittels einer Kalotte (17) schwenkbar gelagert ist.6. Fuel injection valve according to claim 4, characterized in that the hydraulic coupler (10) on the actuator head (8) by means of a spherical cap (17) is pivotally mounted.
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der hydraulische Koppler (10) auf einer Ventilnadel (19) mittels einer Kalotte (17) schwenkbar gelagert ist.7. Fuel injection valve according to one of claims 1 to 6, characterized in that the hydraulic coupler (10) on a valve needle (19) by means of a spherical cap (17) is pivotally mounted.
8. Brennstoffeinspritzventil nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß in dem Aktorfuß (7) zumindest eine axiale Bohrung (22) ausgebildet ist.8. Fuel injection valve according to one of claims 2 to 7, characterized in that in the actuator base (7) at least one axial bore (22) is formed.
9. Brennstoffeinspritzventil nach Anspruch 8, dadurch gekennzeichnet, daß die elektrischen Leitungen (6) in der zumindest einen axialen Bohrung (22) angeordnet sind.9. Fuel injection valve according to claim 8, characterized in that the electrical lines (6) are arranged in the at least one axial bore (22).
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Brennstoffeinspritzventil (1) an einem zulaufseifigen Ende von einer Kunststoffumspritzung (27) versehen ist.10. Fuel injection valve according to one of claims 1 to 9, characterized in that the fuel injection valve (1) is provided at an inlet-soap end by a plastic coating (27).
11. Brennstoffeinspritzventil nach Anspruch 10, dadurch gekennzeichnet, daß an der Kunststoffumspritzung (27) ein Stecker (28) angeformt ist.11. Fuel injection valve according to claim 10, characterized in that that a plug (28) is molded onto the plastic extrusion coating (27).
12. Brennstoffeinspritzventil nach Anspruch 11, dadurch gekennzeichnet, daß die elektrischen Leitungen (6) in dem Stecker (28) ausmünden .12. Fuel injection valve according to claim 11, characterized in that the electrical lines (6) open into the plug (28).
13. Brennstoffeinspritzventil nach Anspruch 12, dadurch gekennzeichnet, daß die elektrischen Leitungen (6) achsparallel zu einer Längsachse des Brennstoffeinspritzventils (1) und des Aktors (4) verlaufen. 13. Fuel injection valve according to claim 12, characterized in that the electrical lines (6) run axially parallel to a longitudinal axis of the fuel injection valve (1) and the actuator (4).
EP04704537A 2003-03-12 2004-01-23 Fuel injection valve Expired - Lifetime EP1606509B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10310790 2003-03-12
DE2003110790 DE10310790A1 (en) 2003-03-12 2003-03-12 Fuel injection valve for IC engine fuel injection system, has hydraulic coupler between actuator and valve group incorporating valve closure and valve seat surface
PCT/DE2004/000098 WO2004081367A1 (en) 2003-03-12 2004-01-23 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1606509A1 true EP1606509A1 (en) 2005-12-21
EP1606509B1 EP1606509B1 (en) 2007-08-29

Family

ID=32892081

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Application Number Title Priority Date Filing Date
EP04704537A Expired - Lifetime EP1606509B1 (en) 2003-03-12 2004-01-23 Fuel injection valve

Country Status (7)

Country Link
US (1) US7635093B2 (en)
EP (1) EP1606509B1 (en)
JP (1) JP2006513363A (en)
CN (1) CN100404846C (en)
BR (1) BRPI0407942A (en)
DE (2) DE10310790A1 (en)
WO (1) WO2004081367A1 (en)

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Also Published As

Publication number Publication date
BRPI0407942A (en) 2006-02-21
EP1606509B1 (en) 2007-08-29
CN1759237A (en) 2006-04-12
DE10310790A1 (en) 2004-09-23
DE502004004809D1 (en) 2007-10-11
US20060175438A1 (en) 2006-08-10
JP2006513363A (en) 2006-04-20
WO2004081367A1 (en) 2004-09-23
US7635093B2 (en) 2009-12-22
CN100404846C (en) 2008-07-23

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