EP1472451B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1472451B1
EP1472451B1 EP02792621A EP02792621A EP1472451B1 EP 1472451 B1 EP1472451 B1 EP 1472451B1 EP 02792621 A EP02792621 A EP 02792621A EP 02792621 A EP02792621 A EP 02792621A EP 1472451 B1 EP1472451 B1 EP 1472451B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
lid
valve according
pot
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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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EP02792621A
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German (de)
French (fr)
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EP1472451A1 (en
Inventor
Ferdinand Reiter
Martin Maier
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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
    • 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
    • F02M61/16—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9084—Rheological fluids
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • a path transformer for a piezoelectric actuator in which the actuator transmits a lifting force to a master cylinder, which is closed by a cylinder carrier.
  • a slave piston In this master cylinder, a slave piston is guided, which also closes the master cylinder and thereby forms the hydraulic chamber.
  • a spring In the hydraulic chamber, a spring is arranged, which presses apart the master cylinder and the slave piston.
  • the slave piston mechanically transfers a lifting movement to, for example, a valve needle.
  • electrorheological fluid in a fuel injection valve which has a valve connected to the valve needle of the fuel injection valve damping element for modeling the injection curve or the injected fuel quantity, which upon excitation or deenergization of the electromagnet, a flow of electrorheological fluid in a damping chamber via a capacitive component causes.
  • the viscosity of the electrorheological fluid can be changed by means of the capacitive component such that the movement of the damping element takes place in such a way that the fuel sprayed off via the spray opening assumes a desired beam shape or in the desired manner in time is hosed.
  • the use of the rheological fluid for a compensation element for piezoelectric or magnetostrictive actuators is not described there.
  • the fuel injector according to the invention with the features of the independent claim 1 has the advantage that a closed, filled with a rheological fluid compensation element downstream of the piezoelectric or magnetostrictive actuator is arranged, which compensates on the one hand, the slow thermal expansion of the different components of a fuel injection valve and on the other hand fast switching movements of the actuator transmits as opening pulse on the valve needle.
  • the compensation element is formed from a pot and a lid, wherein the pot is rigid and the lid is flexible.
  • the lid is provided with beads which improve the elastic deformability of the lid.
  • a further advantage is that the pot of the compensating element is easy to produce by deep drawing.
  • the lid can be hermetically connected to the pot after filling, so that the filled compensating element can be mounted in a simple manner as a total component in the fuel injection valve.
  • FIG. 1 illustrated embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignited 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 an actuator 2, which is constructed, for example, of piezoelectric layers 3.
  • the actuator 2 is encapsulated in a housing 4, on which the actuator 2 is supported on the front side.
  • an actuating element 5 is arranged, which is stamp-shaped and rests against a compensating element 6.
  • a detailed description of the compensating element 6 and its operation are the description to Fig. 2 refer to.
  • a valve needle 7 Downstream of the compensating element 6, a valve needle 7 is arranged, with which a support disk 8 is non-positively connected. Between the support plate 8 and a housing shoulder 9, a return spring 10 is arranged, which acts on the valve needle 7 so that a connected to the valve needle 7 valve closing body 11 is held in sealing engagement with a valve seat surface 12, which at one in the embodiment with the housing 4 of the Fuel injection valve 1 integrated valve seat body 17 is formed.
  • the fuel injection valve 1 is energized via an electrical line, not shown, expand the piezoelectric layers 3 of the actuator 2, whereby the actuator body 5, the compensation element 6 and the valve needle 7 are moved against the force of the return spring 10 in the outflow direction.
  • the standing with the valve needle 7 in operative connection valve closing body 11 lifts off from the valve seat surface 12, whereby fuel is injected into the combustion chamber of the internal combustion engine, not shown.
  • the piezoelectric layers 3 contract, whereby the return spring 10 moves the valve needle 7 by pressure on the support disk 8 against the outflow direction.
  • the valve closing body 11 sets on the valve seat surface 12, whereby the fuel injection valve 1 is closed.
  • Fig. 2 shows in an enlarged, schematic view the in Fig. 1 with II designated cutout in the area of the compensation element. 6
  • the compensation element 6 has the task of compensating for slow changes in length due to thermal influences, in particular of the actuator 2, so that the valve closing body 11 does not lift off the valve seat surface 12 due to the slow thermal expansion of the actuator 2. Rapid changes in length of the actuator 2 by energizing to switch the fuel injection valve 1, however, are to be transferred to the valve needle 7.
  • the stamp-shaped actuating element 5 is supported on the inlet side, while the valve needle 7 bears against the cover 14.
  • the Pot 13 is filled with a rheological fluid 15 before closing, before the lid 14 is put on and the pot 13 is hermetically sealed.
  • the thickness of the material of the pot 13 is preferably selected so that the pot 13 is rigid, while the material of the lid 14 is thinner and thus more flexible chosen.
  • beads 16 may be provided which are, for example, annularly mounted on the lid 14. Due to the flexibility of the lid 14, it is possible that this is reversibly elastically deformed when heat different components of the fuel injection valve 1 by the thermal load during operation of the internal combustion engine and thereby undergo a change in length.
  • the entrapped rheological fluid 15 behaves at a slow strain rate like a liquid, i. H. the lid 14 is pressed by the counteracting forces of the expanding actuator 2 and the return spring 10 in the pot 13, so that the fuel injection valve 1 remains closed despite the thermal change in length.
  • the rheological fluid 15 behaves at high operating speed, ie in the energization of the actuator 2 for opening the fuel injection valve 1, such as a solid, so that the compensation element 6 reacts stiffly and transmits the stroke of the actuator 2 to the valve needle 7.
  • the compensating element 6 has the particular advantage that the compensation element 6 is simple and inexpensive to produce.
  • the compensating element 6 also has the advantage over a hydraulic coupler, that the functional scope of the piezoelectric actuator 2 is not limited. While in a hydraulic coupler, the coupling medium escapes between the pistons in two rapidly successive pulses and the time for the return flow is too short, the compensating element 6 with the rheological fluid 15 on react as quickly as desired successive opening pulses.
  • the invention is not limited to the illustrated embodiment and z. B. also suitable for magnetostrictive actuators 2 and for any other construction of fuel fine injection valves 1, which fall within the scope of the present invention, as defined in the appended claims.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Aus der EP 0 477 400 A1 ist ein Wegtransformator für einen piezoelektrischen Aktor bekannt, bei der der Aktor eine Hubkraft auf einen Geberzylinder überträgt, der durch einen Zylinderträger abgeschlossen ist. In diesem Geberzylinder wird ein Nehmerkolben geführt, der den Geberzylinder ebenfalls abschließt und hierdurch die Hydraulikkammer bildet. In der Hydraulikkammer ist eine Feder angeordnet, die den Geberzylinder und den Nehmerkolben auseinander drückt. Der Nehmerkolben überträgt eine Hubbewegung mechanisch auf beispielsweise eine Ventilnadel. Wenn der Aktor auf den Geberzylinder einen Hubbewegung überträgt, wird diese Hubbewegung durch den Druck eines Hydraulikfluids in der Hydraulikkammer auf den Nehmerkolben übertragen, da das Hydraulikfluid in der Hydraulikkammer sich nicht zusammenpressen läßt und nur ein ganz geringer Anteil des Hydraulikfluids durch den Ringspalt während des kurzen Zeitraumes eines Hubes entweichen kann. In der Ruhephase, wenn der Aktor keine Druckkraft auf den Geberzylinder ausübt, wird durch die Feder der Nehmerkolben aus dem Zylinder herausgedrückt und durch den entstehenden Unterdruck dringt über den Ringspalt das Hydraulikfluid in den Hydraulikraum ein und füllt diesen wieder auf. Dadurch stellt der Wegtransformator sich automatisch auf Längenausdehnungen und druckbedingte Dehnungen eines Brennstoffeinspritzventils ein.From the EP 0 477 400 A1 a path transformer for a piezoelectric actuator is known in which the actuator transmits a lifting force to a master cylinder, which is closed by a cylinder carrier. In this master cylinder, a slave piston is guided, which also closes the master cylinder and thereby forms the hydraulic chamber. In the hydraulic chamber, a spring is arranged, which presses apart the master cylinder and the slave piston. The slave piston mechanically transfers a lifting movement to, for example, a valve needle. When the actuator transmits to the master cylinder a lifting movement, this lifting movement is transmitted to the slave piston by the pressure of a hydraulic fluid in the hydraulic chamber, since the hydraulic fluid in the hydraulic chamber can not compress and only a very small portion of the hydraulic fluid through the annular gap during the short Period of a stroke can escape. In the resting phase, when the actuator exerts no pressure force on the master cylinder, the slave piston is pushed out of the cylinder by the spring and by the resulting Underpressure penetrates the hydraulic fluid into the hydraulic chamber via the annular gap and fills it up again. As a result, the path transformer automatically adjusts to length expansions and pressure-related expansions of a fuel injection valve.

Nachteilig an der aus der EP 0 477 400 A1 bekannten Koppleranordnung ist insbesondere der hohe Kostenaufwand bedingt durch die Forderung nach hoher Fertigungsgenauigkeit der Bauteile. Weiterhin entweicht bei eng aufeinanderfolgenden Öffnungsimpulsen das Kopplermedium aus dem Kopplerspalt und kann bedingt durch die geringe Weite der Leckagespalte nicht schnell genug nachströmen, so daß die Schaltdynamik von Brennstoffeinspritzventilen mit hydraulischen Kopplern begrenzt ist.A disadvantage of the EP 0 477 400 A1 Known coupler arrangement is particularly the high cost due to the demand for high manufacturing accuracy of the components. Furthermore escapes at closely spaced opening pulses, the coupler medium from the coupler gap and can not flow fast enough due to the small width of the leakage gaps, so that the switching dynamics of fuel injection valves with hydraulic couplers is limited.

Zwar ist aus der DE 197 35 232 A1 die Verwendung von elektrorheologischer Flüssigkeit in einem Brennstoffeinspritzventil bekannt, welches zur Modellierung des Einspritzverlaufs bzw. der eingespritzten Brennstoffmenge ein mit der Ventilnadel des Brennstoffeinspritzventils verbundenes Dämpfungselement aufweist, welches bei einer Erregung oder Entregung des Elektromagneten eine Strömung von elektrorheologischer Flüssigkeit in einem Dämpfungsraum über ein kapazitives Bauteil bewirkt. Dabei kann mittels eines elektronischen Steuergeräts in Abhängigkeit von Betriebskenngrößen der Brennkraftmaschine die Viskosität der elektrorheologischen Flüssigkeit mittels des kapazitiven Bauteils derart geändert werden, daß der Bewegungsverlauf des Dämpfungselements derart erfolgt, daß der über die Abspritzöffnung abgespritzte Brennstoff eine gewünschte Strahlform einnimmt bzw. in gewünschter Weise zeitlich abgespritzt wird. Die Verwendung der rheologischen Flüssigkeit für ein Ausgleichselement für piezoelektrische oder magnetostriktive Aktoren ist dort aber nicht beschrieben.Although is out of the DE 197 35 232 A1 the use of electrorheological fluid in a fuel injection valve is known, which has a valve connected to the valve needle of the fuel injection valve damping element for modeling the injection curve or the injected fuel quantity, which upon excitation or deenergization of the electromagnet, a flow of electrorheological fluid in a damping chamber via a capacitive component causes. In this case, by means of an electronic control unit in dependence on operating characteristics of the internal combustion engine, the viscosity of the electrorheological fluid can be changed by means of the capacitive component such that the movement of the damping element takes place in such a way that the fuel sprayed off via the spray opening assumes a desired beam shape or in the desired manner in time is hosed. The use of the rheological fluid for a compensation element for piezoelectric or magnetostrictive actuators is not described there.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des unabhängigen Anspruchs 1 hat demgegenüber den Vorteil, daß ein abgeschlossenes, mit einer rheologischen Flüssigkeit gefülltes Ausgleichselement abströmseitig des piezoelektrischen oder magnetostriktiven Aktors angeordnet ist, welches einerseits die langsame thermische Ausdehnung der unterschiedlichen Bauteile eines Brennstoffeinspritzventils ausgleicht und andererseits schnelle Schaltbewegungen des Aktors als Öffnungsimpuls auf die Ventilnadel überträgt.The fuel injector according to the invention with the features of the independent claim 1 has the advantage that a closed, filled with a rheological fluid compensation element downstream of the piezoelectric or magnetostrictive actuator is arranged, which compensates on the one hand, the slow thermal expansion of the different components of a fuel injection valve and on the other hand fast switching movements of the actuator transmits as opening pulse on the valve needle.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in the main claim are possible.

Vorteilhafterweise ist das Ausgleichselement aus einem Topf und einem Deckel ausgebildet, wobei der Topf biegesteif und der Deckel flexibel ist.Advantageously, the compensation element is formed from a pot and a lid, wherein the pot is rigid and the lid is flexible.

Von Vorteil ist außerdem, daß der Deckel mit Sicken versehen ist, welche die elastische Verformbarkeit des Deckels verbessern.Another advantage is that the lid is provided with beads which improve the elastic deformability of the lid.

Weiterhin ist von Vorteil, daß der Topf des Ausgleichselements durch Tiefziehen einfach herstellbar ist. Der Deckel kann nach dem Befüllen hermetisch mit dem Topf verbunden werden, so daß das befüllte Ausgleichselement in einfacher Weise als Gesamtbauteil im Brennstoffeinspritzventil montiert werden kann.A further advantage is that the pot of the compensating element is easy to produce by deep drawing. The lid can be hermetically connected to the pot after filling, so that the filled compensating element can be mounted in a simple manner as a total component in the fuel injection valve.

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 erfindungsgemäß ausgestalteten Brennstoffeinspritzventils, und
Fig. 2
einen schematischen Ausschnitt aus dem in Fig. 1 dargestellten Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of an inventively designed fuel injector, and
Fig. 2
a schematic section of the in Fig. 1 illustrated embodiment of the fuel injection valve according to the invention in the area II in Fig. 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein in Fig. 1 dargestelltes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 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.An in Fig. 1 illustrated embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignited 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 einen Aktor 2, welcher beispielsweise aus piezoelektrischen Schichten 3 aufgebaut ist. Der Aktor 2 ist in einem Gehäuse 4 gekapselt, an welchem sich der Aktor 2 stirnseitig abstützt.The fuel injection valve 1 comprises an actuator 2, which is constructed, for example, of piezoelectric layers 3. The actuator 2 is encapsulated in a housing 4, on which the actuator 2 is supported on the front side.

Abströmseitig des Aktors 2 ist ein Betätigungselement 5 angeordnet, welches stempelförmig ausgebildet ist und an einem Ausgleichselement 6 anliegt. Eine detaillierte Darstellung des Ausgleichselements 6 und seine Funktionsweise sind der Beschreibung zu Fig. 2 zu entnehmen.On the downstream side of the actuator 2, an actuating element 5 is arranged, which is stamp-shaped and rests against a compensating element 6. A detailed description of the compensating element 6 and its operation are the description to Fig. 2 refer to.

Abströmseitig des Ausgleichselements 6 ist eine Ventilnadel 7 angeordnet, mit welcher eine Stützscheibe 8 kraftschlüssig verbunden ist. Zwischen der Stützscheibe 8 und einer Gehäuseschulter 9 ist eine Rückstellfeder 10 angeordnet, welche die Ventilnadel 7 so beaufschlagt, daß ein mit der Ventilnadel 7 verbundener Ventilschließkörper 11 in dichtender Anlage an einer Ventilsitzfläche 12 gehalten wird, welche an einem im Ausführungsbeispiel mit dem Gehäuse 4 des Brennstoffeinspritzventils 1 integrierten Ventilsitzkörper 17ausgebildet ist.Downstream of the compensating element 6, a valve needle 7 is arranged, with which a support disk 8 is non-positively connected. Between the support plate 8 and a housing shoulder 9, a return spring 10 is arranged, which acts on the valve needle 7 so that a connected to the valve needle 7 valve closing body 11 is held in sealing engagement with a valve seat surface 12, which at one in the embodiment with the housing 4 of the Fuel injection valve 1 integrated valve seat body 17 is formed.

Wird das Brennstoffeinspritzventil 1 über eine nicht weiter dargestellte elektrische Leitung bestromt, dehnen sich die piezoelektrischen Schichten 3 des Aktors 2 aus, wodurch der Betätigungskörper 5, das Ausgleichselement 6 und die Ventilnadel 7 entgegen der Kraft der Rückstellfeder 10 in Abströmrichtung bewegt werden. Der mit der Ventilnadel 7 in Wirkverbindung stehende Ventilschließkörper 11 hebt von der Ventilsitzfläche 12 ab, wodurch Brennstoff in den nicht näher dargestellten Brennraum der Brennkraftmaschine eingespritzt wird.If the fuel injection valve 1 is energized via an electrical line, not shown, expand the piezoelectric layers 3 of the actuator 2, whereby the actuator body 5, the compensation element 6 and the valve needle 7 are moved against the force of the return spring 10 in the outflow direction. The standing with the valve needle 7 in operative connection valve closing body 11 lifts off from the valve seat surface 12, whereby fuel is injected into the combustion chamber of the internal combustion engine, not shown.

Wird die Bestromung des Aktors 2 eingestellt, ziehen sich die piezoelektrischen Schichten 3 zusammen, wodurch die Rückstellfeder 10 die Ventilnadel 7 durch Druck auf die Stützscheibe 8 entgegen der Abströmrichtung bewegt. Der Ventilschließkörper 11 setzt auf der Ventilsitzfläche 12 auf, wodurch das Brennstoffeinspritzventil 1 geschlossen wird.If the energization of the actuator 2 is adjusted, the piezoelectric layers 3 contract, whereby the return spring 10 moves the valve needle 7 by pressure on the support disk 8 against the outflow direction. The valve closing body 11 sets on the valve seat surface 12, whereby the fuel injection valve 1 is closed.

Fig. 2 zeigt in einer vergrößerten, schematischen Ansicht den in Fig. 1 mit II bezeichneten Ausschnitt im Bereich des Ausgleichselements 6. Fig. 2 shows in an enlarged, schematic view the in Fig. 1 with II designated cutout in the area of the compensation element. 6

Das Ausgleichselement 6 hat die Aufgabe, langsame Längenänderungen durch thermische Einflüsse insbesondere des Aktors 2 auszugleichen, damit der Ventilschließkörper 11 nicht bedingt durch die langsame thermische Ausdehnung des Aktors 2 von der Ventilsitzfläche 12 abhebt. Schnelle Längenänderungen des Aktors 2 durch Bestromen zum Schalten des Brennstoffeinspritzventils 1 sollen dagegen auf die Ventilnadel 7 übertragen werden.The compensation element 6 has the task of compensating for slow changes in length due to thermal influences, in particular of the actuator 2, so that the valve closing body 11 does not lift off the valve seat surface 12 due to the slow thermal expansion of the actuator 2. Rapid changes in length of the actuator 2 by energizing to switch the fuel injection valve 1, however, are to be transferred to the valve needle 7.

Erfindungsgemäß ist daher das Ausgleichselement 6 aus einem schalenförmigen Topf 13, welcher beispielsweise durch Tiefziehen herstellbar ist, und einem Deckel 14, welcher den Topf 13 abschließt und durch eine umlaufende Schweißnaht mit diesem verbunden sein kann, aufgebaut. An dem Topf 13 stützt sich zulaufseitig das stempelförmige Betätigungselement 5 ab, während an dem Deckel 14 die Ventilnadel 7 anliegt. Der Topf 13 wird vor dem Verschließen mit einer rheologischen Flüssigkeit 15 gefüllt, bevor der Deckel 14 aufgesetzt und der Topf 13 hermetisch abgeschlossen wird.According to the invention, therefore, the compensation element 6 of a cup-shaped pot 13, which can be produced for example by deep drawing, and a lid 14, which closes the pot 13 and may be connected by a circumferential weld with this built. On the pot 13, the stamp-shaped actuating element 5 is supported on the inlet side, while the valve needle 7 bears against the cover 14. Of the Pot 13 is filled with a rheological fluid 15 before closing, before the lid 14 is put on and the pot 13 is hermetically sealed.

Die Dicke des Materials des Topfes 13 ist dabei vorzugsweise so gewählt, daß der Topf 13 biegesteif ist, während das Material des Deckels 14 dünner und damit biegsamer gewählt ist. Zusätzlich können zur weiteren Erhöhung der Flexibilität des Deckels 14 Sicken 16 vorgesehen sein, welche beispielsweise ringförmig auf dem Deckel 14 angebracht sind. Durch die Flexibilität des Deckels 14 ist es möglich, daß dieser reversibel elastisch verformt wird, wenn sich verschiedene Bauteile des Brennstoffeinspritzventils 1 durch die thermische Belastung beim Betrieb der Brennkraftmaschine erwärmen und dadurch eine Längenänderung erfahren.The thickness of the material of the pot 13 is preferably selected so that the pot 13 is rigid, while the material of the lid 14 is thinner and thus more flexible chosen. In addition, to further increase the flexibility of the lid 14 beads 16 may be provided which are, for example, annularly mounted on the lid 14. Due to the flexibility of the lid 14, it is possible that this is reversibly elastically deformed when heat different components of the fuel injection valve 1 by the thermal load during operation of the internal combustion engine and thereby undergo a change in length.

Die eingeschlossene rheologische Flüssigkeit 15 verhält sich bei langsamer Beanspruchungsgeschwindigkeit wie eine Flüssigkeit, d. h. der Deckel 14 wird durch die einander entgegenwirkenden Kräfte des sich ausdehnenden Aktors 2 und der Rückstellfeder 10 in den Topf 13 hineingedrückt, so daß das Brennstoffeinspritzventil 1 trotz der thermischen Längenänderung geschlossen bleibt. Dagegen verhält sich die rheologische Flüssigkeit 15 bei hoher Betätigungsgeschwindigkeit, also bei der Bestromung des Aktors 2 zum Öffnen des Brennstoffeinspritzventils 1, wie ein Festkörper, so daß das Ausgleichselement 6 steif reagiert und den Hub des Aktors 2 auf die Ventilnadel 7 überträgt.The entrapped rheological fluid 15 behaves at a slow strain rate like a liquid, i. H. the lid 14 is pressed by the counteracting forces of the expanding actuator 2 and the return spring 10 in the pot 13, so that the fuel injection valve 1 remains closed despite the thermal change in length. In contrast, the rheological fluid 15 behaves at high operating speed, ie in the energization of the actuator 2 for opening the fuel injection valve 1, such as a solid, so that the compensation element 6 reacts stiffly and transmits the stroke of the actuator 2 to the valve needle 7.

Eine derartige Anordnung hat vor allem den Vorteil, daß das Ausgleichselement 6 einfach und kostengünstig herstellbar ist. Das Ausgleichselement 6 hat zudem den Vorteil gegenüber einem hydraulischen Koppler, daß der Funktionsumfang des piezoelektrischen Aktors 2 nicht eingeschränkt ist. Während bei einem hydraulischen Koppler das Kopplermedium zwischen den Kolben bei zwei schnell aufeinanderfolgenden Impulsen entweicht und die Zeit zum Rückströmen zu kurz ist, kann das Ausgleichselement 6 mit der rheologischen Flüssigkeit 15 auf beliebig schnell aufeinanderfolgende Öffnungsimpulse reagieren.Such an arrangement has the particular advantage that the compensation element 6 is simple and inexpensive to produce. The compensating element 6 also has the advantage over a hydraulic coupler, that the functional scope of the piezoelectric actuator 2 is not limited. While in a hydraulic coupler, the coupling medium escapes between the pistons in two rapidly successive pulses and the time for the return flow is too short, the compensating element 6 with the rheological fluid 15 on react as quickly as desired successive opening pulses.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und z. B. auch für magnetostriktive Aktoren 2 sowie für beliebige andere Bauweisen von Brennstof feinspritzventilen 1 geeignet, die in den Schutzbereich der vorliegenden Erfindung fallen, wie er in den beigefügten Ansprüchen definiert ist.The invention is not limited to the illustrated embodiment and z. B. also suitable for magnetostrictive actuators 2 and for any other construction of fuel fine injection valves 1, which fall within the scope of the present invention, as defined in the appended claims.

Claims (9)

  1. Fuel injection valve (1) for directly injecting fuel into the combustion chamber of a mixture-compression, spark-ignition internal combustion engine, having a piezoelectric or magnetostrictive actuator (2) and having a valve needle (7) which is operatively connected to the actuator (2) by means of a compensating element (6) and on which is formed a valve closing body (11) which interacts with a valve seat face (12) to form a sealing seat,
    characterized
    in that the compensating element (6) is filled with a rheological liquid (15).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the compensating element (6) has a pot (13) which is arched in the shape of a shell.
  3. Fuel injection valve according to Claim 2,
    characterized
    in that the compensating element (6) has a lid (14).
  4. Fuel injection valve according to Claim 3,
    characterized
    in that the lid (14) is hermetically connected to the pot (13).
  5. Fuel injection valve according to one of Claims 2 to 4,
    characterized
    in that the thickness of the material which forms the pot (13) is selected such that the pot (13) is bending-resistant.
  6. Fuel injection valve according to one of Claims 3 to 4,
    characterized
    in that the thickness of the material which forms the lid (14) is selected such that the lid (14) is elastically deformable.
  7. Fuel injection valve according to Claim 6,
    characterized
    in that the lid (14) has beads (16).
  8. Fuel injection valve according to Claim 7,
    characterized
    in that the beads (16) are formed in a ring shape on the lid (14).
  9. Fuel injection valve according to one of Claims 3, 4, 6, 7 or 8,
    characterized
    in that the lid (14) faces towards the valve needle (7) of the fuel injection valve (1).
EP02792621A 2002-01-30 2002-11-29 Fuel injection valve Expired - Lifetime EP1472451B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10203659 2002-01-30
DE10203659A DE10203659A1 (en) 2002-01-30 2002-01-30 Fuel injector
PCT/DE2002/004386 WO2003064846A1 (en) 2002-01-30 2002-11-29 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1472451A1 EP1472451A1 (en) 2004-11-03
EP1472451B1 true EP1472451B1 (en) 2008-03-26

Family

ID=7713422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792621A Expired - Lifetime EP1472451B1 (en) 2002-01-30 2002-11-29 Fuel injection valve

Country Status (6)

Country Link
US (1) US6932278B2 (en)
EP (1) EP1472451B1 (en)
JP (1) JP4456872B2 (en)
KR (1) KR100942670B1 (en)
DE (2) DE10203659A1 (en)
WO (1) WO2003064846A1 (en)

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DE102010019670B4 (en) 2010-05-07 2016-01-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Actuator with an actuator
US20130068200A1 (en) * 2011-09-15 2013-03-21 Paul Reynolds Injector Valve with Miniscule Actuator Displacement
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DE102012202909A1 (en) 2012-02-27 2013-08-29 Robert Bosch Gmbh Valve for metering fluid
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Also Published As

Publication number Publication date
KR20040077904A (en) 2004-09-07
JP2005516155A (en) 2005-06-02
KR100942670B1 (en) 2010-02-17
US6932278B2 (en) 2005-08-23
US20040159722A1 (en) 2004-08-19
WO2003064846A1 (en) 2003-08-07
JP4456872B2 (en) 2010-04-28
EP1472451A1 (en) 2004-11-03
DE50211993D1 (en) 2008-05-08
DE10203659A1 (en) 2003-07-31

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