EP1105639B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1105639B1
EP1105639B1 EP99962123A EP99962123A EP1105639B1 EP 1105639 B1 EP1105639 B1 EP 1105639B1 EP 99962123 A EP99962123 A EP 99962123A EP 99962123 A EP99962123 A EP 99962123A EP 1105639 B1 EP1105639 B1 EP 1105639B1
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EP
European Patent Office
Prior art keywords
fuel injection
spring
valve needle
valve
armature
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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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EP99962123A
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German (de)
French (fr)
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EP1105639A1 (en
Inventor
Ferdinand Reiter
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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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means

Definitions

  • the invention is based on a fuel injection valve according to the preamble of the main claim.
  • the fuel injection valve has one with a Valve needle connected valve closing body, with a valve seat surface formed on a valve seat body cooperates a sealing seat.
  • a Magnetic coil provided with a magnet armature interacts with the valve needle between a Movement of the armature in the stroke direction of the valve needle limiting first stop and one the movement of the Anchor against the stroke direction limiting second Stop is movable. That through the two stops fixed axial movement of the anchor leads in certain limits to a decoupling of the inertial mass of Valve needle and the valve closing body on the one hand and the inertial mass of the anchor on the other hand.
  • the fuel injection valve according to the invention with the Characteristic features of the main claim has the Advantage that any bumpers of the valve needle still can be avoided more effectively. It results in a high long-term stability, since the spring element against a Elastomer material has a long life and especially from the fuel is not destructible. A targeted adjustment of the damping properties is insofar possible that certain materials, shapes and Biases are used for the spring element.
  • the spring element first serves as a lower second stop for the anchor, secondly as a damping element that the Movement of the armature continuously slows down and on this Make a bouncing of the valve needle on the valve seat surface avoids or severely restricts, and third as Sliding spring, which attaches the anchor to its rest position presses on the first stop.
  • the one component of the spring element is a very high Function integration achieved.
  • the spring element according to the invention is in an advantageous manner easy and inexpensive to produce, in Fuel injector mounted on the valve needle and adjustable.
  • the spring element with a shaft and form a plurality of spring arms emanating from the shaft. It makes sense to use a spring steel sheet, which by deep drawing and punching in a desired Mushroom shape is brought.
  • FIG. 1 shows a Embodiment of an inventive Fuel injector in a cut Representation
  • Figure 2 shows a detail of Figure 1 around the anchor in an enlarged view
  • Figure 3 a Section along the line III-III in Figure 2
  • Figure 4 a alternative embodiment of serving as a damping spring Spring element in an analogous representation to Figure 3
  • Figure 5 is a plan view of a spring element.
  • FIG. 1 shows a section of an excerpt Representation of an inventive fuel injection valve 1.
  • the fuel injection valve 1 is for injecting Fuel in a mixture-compressing, spark-ignited Internal combustion engine.
  • the illustrated embodiment is as a high-pressure injector for direct injection of fuel, especially of gasoline, into the combustion chamber an internal combustion engine used.
  • the fuel injection valve 1 has an im Embodiment in one piece with a valve needle. 2 connected valve closing body 3, which with a on to a valve seat body 4 formed valve seat surface cooperates a sealing seat.
  • the valve seat body 4 is in a tubular valve seat carrier 5 is fixed, which in a Receiving bore of a cylinder head of the internal combustion engine is insertable and sealed by a seal 6.
  • the valve seat carrier 5 is at its inlet end. 7 used in a longitudinal bore 8 of a housing body 9 and against the housing body 9 by means of a sealing ring 10th sealed.
  • the end 7 of the valve seat carrier 5 is by means a threaded ring 11 biased, wherein between a Stage 12 of the housing body 9 and an upper end face 13 of the valve seat carrier 5 a Hubeinstellfit 14th is clamped.
  • a solenoid 15 For electromagnetic actuation of the Fuel injection valve 1 is a solenoid 15, the is wound on a bobbin 16.
  • electrical Excitation of the magnetic coil 15 is an armature 17 against a Stop surface 18 of the housing body 9 is pulled, the Housing body 9 upstream of the stop surface 18 as magnetic inner pole is formed, to which from the Stop surface 18 starting in the downstream direction a thin-walled magnetic throttle 19 connects.
  • at his lifting movement takes the armature 17 due to the plant its upstream face 35 at a first one Stop forming stop body 20 with the Stop body 20 firmly connected valve needle 2 and the Valve closing body 3 with.
  • the valve needle 2 is e.g. With the stopper body 20 is connected by a weld 22. The movement of the valve needle 2 takes place against a Return spring 23, between an adjusting sleeve 24 and the stopper body 20 is arranged.
  • the fuel flows through an axial bore 30 of the Housing body 9 and at least one provided in the armature 17 Axial bore 31 and over in a guide plate 32nd provided axial bores 33 in a longitudinal opening 34 of the Valve seat carrier 5 up to the sealing seat of Fuel injection valve 1.
  • the armature 17 is between the stopper body 20 and a according to the invention as a sliding spring and damping spring trained and serving as a second stop Spring element 25 arranged movably on the valve needle 2.
  • a sliding spring and damping spring trained and serving as a second stop Spring element 25 arranged movably on the valve needle 2.
  • the spring element 25 is advantageously with a tubular shaft 38 and with several outgoing therefrom Spring arms 39 formed.
  • the shaft 38 of the spring element 25 immediately surrounds the valve needle 2 and is applied this one.
  • the shaft 38 conceivable as the figures 3 and 4 clarify the sections along the line III-III in Figure 2 represent.
  • the Shaft 38 according to FIG. 4 with e.g. three axially extending Ribs 41 formed, which protrude from the valve needle 2 and are arranged at a respective distance of 120 °.
  • Valve needle 2 / spring element 25 with a press fit to Achieving a firm press connection, it is also possible for further securing in the region of the shaft 38 a or several weld points or seams 40 to put, as shown in Figure 2 is indicated on the right side.
  • the e.g. out stainless spring steel sheet molded spring element 25 is for example, by deep drawing and subsequent punching brought into its desired shape.
  • the real one Spring action is achieved by the spring arms 39, the off the shaft 38 emerge and from the valve needle. 2 abspreizen.
  • the spring arms 39 extend finger-like over the entire circumference of the shaft 38 away, wherein each individual spring arm 39 under a spring tension is arched.
  • the Spring arms 39 arched such that the armature 17 with his Edge region near the outer periphery at outer areas 42 to Attachment to the spring arms 39 comes, so that a tilting of the Ankers 17 can be excluded.
  • the radial end of the Spring arms 39 form behind the armature pad serving Outside 42 Federarmenden 44, the back of the anchor 17th are bent away, so that no sharp edges on the anchor 17th issue.
  • Figure 5 shows a plan view of a spring element 25 with six spring arms 39 distributed over the circumference. Another Number of spring arms 39 of the spring element 25 is however just as conceivable.
  • the spring arms 39 have e.g. corresponding of the bending moment curve radially outward one smaller width than the shaft 38 out.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention is based on a fuel injection valve according to the preamble of the main claim.

Aus der US-PS 5,299,776 ist bereits ein Brennstoffeinspritzventil nach dem Oberbegriff des Anspruchs 1 bekannt. Das Brennstoffeinspritzventil hat einen mit einer Ventilnadel verbundenen Ventilschließkörper, der mit einer an einem Ventilsitzkörper ausgebildeten Ventilsitzfläche zu einem Dichtsitz zusammenwirkt. Zur elektromagnetischen Betätigung des Brennstoffeinspritzventils ist eine Magnetspule vorgesehen, die mit einem Magnetanker zusammenwirkt, der an der Ventilnadel zwischen einem die Bewegung des Ankers in der Hubrichtung der Ventilnadel begrenzenden ersten Anschlag und einem die Bewegung des Ankers entgegen der Hubrichtung begrenzenden zweiten Anschlag beweglich ist. Das durch die beiden Anschläge festgelegte axiale Bewegungsspiel des Ankers führt in gewissen Grenzen zu einer Entkopplung der trägen Masse der Ventilnadel und des Ventilschließkörpers einerseits und der trägen Masse des Ankers andererseits. Dadurch wird einem Zurückprallen des Ventilschließkörpers von der Ventilsitzfläche beim Schließen des Brennstoffeinspritzventils in gewissen Grenzen entgegengewirkt. Preller der Ventilnadel bzw. des Ventilschließkörpers führen zu einem unkontrollierten, kurzzeitigen Öffnen des Brennstoffeinspritzventils und somit zu einer nicht reproduzierbaren Zumessmenge des Brennstoffs und zu einem unkontrollierten Einspritzverhalten. Da jedoch die axiale Lage des Ankers bezüglich der Ventilnadel durch die freie Beweglichkeit des Ankers gegenüber der Ventilnadel vollkommen undefiniert ist, werden Preller nur in beschränktem Maße vermieden. Insbesondere wird nicht vermieden, dass der Anker bei der Schließbewegung des Brennstoffeinspritzventils auf den dem Ventilschließkörper zugewandten Anschlag auftrifft und seinen Impuls schlagartig auf die Ventilnadel und somit auf den Ventilschließkörper überträgt.From US-PS 5,299,776 is already a Fuel injection valve according to the preamble of the claim 1 known. The fuel injection valve has one with a Valve needle connected valve closing body, with a valve seat surface formed on a valve seat body cooperates a sealing seat. To the electromagnetic Actuation of the fuel injection valve is a Magnetic coil provided with a magnet armature interacts with the valve needle between a Movement of the armature in the stroke direction of the valve needle limiting first stop and one the movement of the Anchor against the stroke direction limiting second Stop is movable. That through the two stops fixed axial movement of the anchor leads in certain limits to a decoupling of the inertial mass of Valve needle and the valve closing body on the one hand and the inertial mass of the anchor on the other hand. This will become one Rebound of the valve closing body of the Valve seat surface when closing the Fuel injection valve within certain limits counteracted. Preller the valve needle or the Valve closing bodies lead to an uncontrolled, short-term opening of the fuel injection valve and thus to a non-reproducible metering amount of the fuel and an uncontrolled injection behavior. However, since the axial position of the armature with respect to the valve needle through the free mobility of the armature relative to the valve needle is completely undefined, Preller are only in limited extent avoided. In particular, will not avoided that the anchor in the closing movement of the Fuel injection valve on the valve closing body facing stop hits and his pulse abruptly on the valve needle and thus on the valve closing body transfers.

Um das Aufprallen des Ankers auf dem dem Ventilschließkörper zugewandten Anschlag zu dämpfen, ist es aus der US-PS 4,766,405 bekannt, zwischen dem Anker und dem Anschlag einen Dämpfungskörper aus einem Elastomerwerkstoff, wie Gummi, anzuordnen. Solche Werkstoffe haben den Nachteil, dass diese in ihrem Dämpfungsverhalten stark temperaturabhängig sind und die Dämpfungswirkung mit einem Ansteigen der Temperatur abnimmt. Außerdem ist die Langzeitstabilität von Elastomeren begrenzt, insbesondere wenn diese mit dem abzuspritzenden Brennstoff in Berührung kommen. Die Montage einer Dämpfungsscheibe aus einem Elastomerwerkstoff ist zudem aufwendig. Eine gezielte Einstellung der Dämpfungseigenschaften ist ebenfalls nicht möglich.Around the bouncing of the anchor on the valve closing body to dampen facing stop, it is from the US PS 4,766,405 known between the anchor and the stop a Damping body of an elastomeric material, such as rubber, to arrange. Such materials have the disadvantage that these are strongly temperature-dependent in their damping behavior and the damping effect with an increase in temperature decreases. In addition, the long-term stability of elastomers limited, especially if this with the abzuspritzenden Fuel come into contact. The assembly of a Damping disc made of an elastomer material is also consuming. A targeted attitude of Damping properties is also not possible.

Aus der US-PS 5,236,173 ist es bekannt, zwischen dem Ventilsitzkörper und einem Ventilsitzträger, an welchem der Ventilsitzkörper montiert ist, eine Dämpfungsfeder in Form einer Tellerfeder vorzusehen, um zu erreichen, dass der Ventilschließkörper an der an dem Ventilsitzkörper ausgebildeten Ventilsitzfläche weich anschlägt. Diese Art der Dämpfung hat jedoch den Nachteil, dass der Ventilsitzkörper nach dem Anschlagen des Ventilschließkörpers in Abspritzrichtung durchschwingt, während der Ventilschließkörper entweder stehen bleibt oder aufgrund der Impulsumkehr sich sogar von dem Ventilsitzkörper entgegen der Abspritzrichtung zurückbewegt. Ventilpreller können deshalb bei dieser Bauform des Brennstoffeinspritzventils sogar noch in verstärktem Maße auftreten.From US-PS 5,236,173 it is known between the Valve seat body and a valve seat carrier to which the Valve seat body is mounted, a damping spring in shape to provide a diaphragm spring to achieve that Valve-closing body on the valve seat body soft trained valve seat surface. This kind However, the damping has the disadvantage that the Valve seat body after striking the Swinging valve closing body in Abspritzrichtung, while the valve closing body either stops or because of the momentum reversal even from the Valve seat body moved back against the Abspritzrichtung. Ventilpreller can therefore in this design of the Fuel injector even more occur.

Aus der US-PS 5,114,077 ist bereits ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen bekannt, das einen elektromagnetischen Kreis mit einer Magnetspule und einem durch die Magnetspule in eine Hubrichtung beaufschlagbaren Anker aufweist. Der Anker ist auf einer mit einem Ventilschließkörper in Verbindung stehenden Ventilnadel angeordnet. Der Anker ist dabei zwischen einem mit der Ventilnadel fest verbundenen, die Bewegung des Ankers in der Hubrichtung begrenzenden ersten Anschlag und einem mit der Ventilnadel fest verbundenen, die Bewegung des Ankers entgegen der Hubrichtung begrenzenden zweiten Anschlag (25) beweglich angeordnet. Auf dem zweiten Anschlag liegt lose eine Dämpfungsscheibe auf, die als federnde Unterlegscheibe eine gewisse Federwirkung besitzt.From US-PS 5,114,077 is already a fuel injection valve for Fuel injection systems of internal combustion engines known, the one electromagnetic circuit with a magnetic coil and a through the magnetic coil in Having a stroke direction acted upon anchor. The anchor is on one with one Valve closing body arranged in connection valve needle. The anchor is doing so between a firmly connected to the valve needle, the movement of the armature in the stroke direction limiting first stop and one with the valve needle firmly connected, the movement of the armature against the stroke direction limiting second Stop (25) arranged movably. On the second stop is loose one Damping disc on the spring washer as a certain spring action has.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, dass eventuelle Preller der Ventilnadel noch wirkungsvoller vermieden werden können. Es ergibt sich eine hohe Langzeitstabilität, da das Federelement gegenüber einem Elastomerwerkstoff eine hohe Lebensdauer hat und insbesondere vom Brennstoff nicht zerstörbar ist. Eine gezielte Einstellung der Dämpfungseigenschaften ist insofern möglich, dass bestimmte Materialien, Formen und Vorspannungen für das Federelement genutzt werden.The fuel injection valve according to the invention with the Characteristic features of the main claim has the Advantage that any bumpers of the valve needle still can be avoided more effectively. It results in a high long-term stability, since the spring element against a Elastomer material has a long life and especially from the fuel is not destructible. A targeted adjustment of the damping properties is insofar possible that certain materials, shapes and Biases are used for the spring element.

Das Federelement dient erstens als unterer zweiter Anschlag für den Anker, zweitens als Dämpfungselement, das die Bewegung des Ankers kontinuierlich abbremst und auf diese Weise ein Prellen der Ventilnadel an der Ventilsitzfläche vermeidet bzw. stark einschränkt, und drittens als Schiebefeder, die den Anker in seine Ruhestellung zur Anlage am ersten Anschlag drückt. In vorteilhafter Weise wird mit dem einen Bauteil des Federelements eine sehr hohe Funktionsintegration erreicht. The spring element first serves as a lower second stop for the anchor, secondly as a damping element that the Movement of the armature continuously slows down and on this Make a bouncing of the valve needle on the valve seat surface avoids or severely restricts, and third as Sliding spring, which attaches the anchor to its rest position presses on the first stop. Advantageously, with the one component of the spring element is a very high Function integration achieved.

Das erfindungsgemäße Federelement ist in vorteilhafter Weise einfach und kostengünstig herstellbar, im Brennstoffeinspritzventil auf der Ventilnadel montierbar und einstellbar.The spring element according to the invention is in an advantageous manner easy and inexpensive to produce, in Fuel injector mounted on the valve needle and adjustable.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.By the measures listed in the dependent claims are advantageous developments and improvements in the Main claim specified fuel injector possible.

Von Vorteil ist es, das Federelement mit einem Schaft und mehreren von dem Schaft ausgehenden Federarmen auszubilden. Dabei bietet es sich an, ein Federstahlblech zu verwenden, welches durch Tiefziehen und Stanzen in eine gewünschte Pilzform gebracht wird.It is advantageous, the spring element with a shaft and form a plurality of spring arms emanating from the shaft. It makes sense to use a spring steel sheet, which by deep drawing and punching in a desired Mushroom shape is brought.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils in einer geschnittenen Darstellung, Figur 2 einen Ausschnitt aus Figur 1 rund um den Anker in einer vergrößerten Darstellung, Figur 3 einen Schnitt entlang der Linie III-III in Figur 2, Figur 4 eine alternative Ausführung des als Dämpfungsfeder dienenden Federelements in einer analogen Darstellung zu Figur 3 und Figur 5 eine Draufsicht auf ein Federelement.Embodiments of the invention are in the drawing simplified and in the following Description explained in more detail. 1 shows a Embodiment of an inventive Fuel injector in a cut Representation, Figure 2 shows a detail of Figure 1 around the anchor in an enlarged view, Figure 3 a Section along the line III-III in Figure 2, Figure 4 a alternative embodiment of serving as a damping spring Spring element in an analogous representation to Figure 3 and Figure 5 is a plan view of a spring element.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 zeigt in einer auszugsweise geschnittenen Darstellung ein erfindungsgemäßes Brennstoffeinspritzventil 1. Das Brennstoffeinspritzventil 1 dient zum Einspritzen von Brennstoff bei einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine. Das dargestellte Ausführungsbeispiel ist dabei als Hochdruck-Einspritzventil zum direkten Einspritzen von Brennstoff, insbesondere von Benzin, in den Brennraum einer Brennkraftmaschine verwendbar.FIG. 1 shows a section of an excerpt Representation of an inventive fuel injection valve 1. The fuel injection valve 1 is for injecting Fuel in a mixture-compressing, spark-ignited Internal combustion engine. The illustrated embodiment is as a high-pressure injector for direct injection of fuel, especially of gasoline, into the combustion chamber an internal combustion engine used.

Das Brennstoffeinspritzventil 1 weist einen im Ausführungsbeispiel einstückig mit einer Ventilnadel 2 verbundenen Ventilschließkörper 3 auf, der mit einer an einem Ventilsitzkörper 4 ausgebildeten Ventilsitzfläche zu einem Dichtsitz zusammenwirkt. Der Ventilsitzkörper 4 ist in einem rohrförmigen Ventilsitzträger 5 befestigt, der in eine Aufnahmebohrung eines Zylinderkopfes der Brennkraftmaschine einführbar ist und mittels einer Dichtung 6 abgedichtet ist. Der Ventilsitzträger 5 ist an seinem zulaufseitigen Ende 7 in eine Längsbohrung 8 eines Gehäusekörpers 9 eingesetzt und gegen den Gehäusekörper 9 mittels eines Dichtrings 10 abgedichtet. Das Ende 7 des Ventilsitzträgers 5 ist mittels eines Gewinderings 11 vorgespannt, wobei zwischen einer Stufe 12 des Gehäusekörpers 9 und einer oberen Stirnfläche 13 des Ventilsitzträgers 5 eine Hubeinstellscheibe 14 eingespannt ist.The fuel injection valve 1 has an im Embodiment in one piece with a valve needle. 2 connected valve closing body 3, which with a on to a valve seat body 4 formed valve seat surface cooperates a sealing seat. The valve seat body 4 is in a tubular valve seat carrier 5 is fixed, which in a Receiving bore of a cylinder head of the internal combustion engine is insertable and sealed by a seal 6. The valve seat carrier 5 is at its inlet end. 7 used in a longitudinal bore 8 of a housing body 9 and against the housing body 9 by means of a sealing ring 10th sealed. The end 7 of the valve seat carrier 5 is by means a threaded ring 11 biased, wherein between a Stage 12 of the housing body 9 and an upper end face 13 of the valve seat carrier 5 a Hubeinstellscheibe 14th is clamped.

Zur elektromagnetischen Betätigung des Brennstoffeinspritzventils 1 dient eine Magnetspule 15, die auf einen Spulenträger 16 gewickelt ist. Bei elektrischer Erregung der Magnetspule 15 wird ein Anker 17 gegen eine Anschlagfläche 18 des Gehäusekörpers 9 gezogen, wobei der Gehäusekörper 9 stromaufwärts der Anschlagfläche 18 als magnetischer Innenpol ausgebildet ist, an den sich von der Anschlagfläche 18 ausgehend in stromabwärtiger Richtung eine dünnwandige magnetische Drosselstelle 19 anschließt. Bei seiner Hubbewegung nimmt der Anker 17 aufgrund der Anlage seiner stromaufwärtigen Stirnfläche 35 an einem einen ersten Anschlag bildenden Anschlagkörper 20 die mit dem Anschlagkörper 20 fest verbundene Ventilnadel 2 und den Ventilschließkörper 3 mit. Die Ventilnadel 2 ist z.B. mit dem Anschlagkörper 20 durch eine Schweißnaht 22 verbunden. Die Bewegung der Ventilnadel 2 erfolgt gegen eine Rückstellfeder 23, die zwischen einer Einstellhülse 24 und dem Anschlagkörper 20 angeordnet ist.For electromagnetic actuation of the Fuel injection valve 1 is a solenoid 15, the is wound on a bobbin 16. In electrical Excitation of the magnetic coil 15 is an armature 17 against a Stop surface 18 of the housing body 9 is pulled, the Housing body 9 upstream of the stop surface 18 as magnetic inner pole is formed, to which from the Stop surface 18 starting in the downstream direction a thin-walled magnetic throttle 19 connects. at his lifting movement takes the armature 17 due to the plant its upstream face 35 at a first one Stop forming stop body 20 with the Stop body 20 firmly connected valve needle 2 and the Valve closing body 3 with. The valve needle 2 is e.g. With the stopper body 20 is connected by a weld 22. The movement of the valve needle 2 takes place against a Return spring 23, between an adjusting sleeve 24 and the stopper body 20 is arranged.

Der Brennstoff strömt über eine Axialbohrung 30 des Gehäusekörpers 9 und wenigstens eine im Anker 17 vorgesehene Axialbohrung 31 sowie über in einer Führungsscheibe 32 vorgesehene Axialbohrungen 33 in eine Längsöffnung 34 des Ventilsitzträgers 5 bis hin zum Dichtsitz des Brennstoffeinspritzventils 1.The fuel flows through an axial bore 30 of the Housing body 9 and at least one provided in the armature 17 Axial bore 31 and over in a guide plate 32nd provided axial bores 33 in a longitudinal opening 34 of the Valve seat carrier 5 up to the sealing seat of Fuel injection valve 1.

Der Anker 17 ist zwischen dem Anschlagkörper 20 und einem erfindungsgemäß als Schiebefeder und Dämpfungsfeder ausgebildeten sowie als zweiten Anschlag dienenden Federelement 25 auf der Ventilnadel 2 beweglich angeordnet. Durch die Federkraftwirkung des Federelements 25 wird der Anker 17 in der nicht erregten Ruhestellung an dem Anschlagkörper 20 in Anlage gehalten. Das Federelement 25 ist fest mit der Ventilnadel 2 verbunden.The armature 17 is between the stopper body 20 and a according to the invention as a sliding spring and damping spring trained and serving as a second stop Spring element 25 arranged movably on the valve needle 2. By the spring force effect of the spring element 25 is the Anchor 17 in the unexcited resting position on the Stop body 20 held in contact. The spring element 25 is firmly connected to the valve needle 2.

Durch das zwischen dem Anschlagkörper 20 und dem Federelement 25 geschaffene Bewegungsspiel des Ankers 17 wird eine Entkopplung der trägen Massen des Ankers 17 einerseits und der Ventilnadel 2 und des Ventilschließkörpers 3 andererseits erreicht. Bei der Schließbewegung der Ventilnadel 2 schlägt an einer Ventilsitzfläche 26 des Ventilsitzkörpers 4 deshalb nur die träge Masse der Ventilnadel 2 an. Der Anker 17 wird bei dem Auftreffen des Ventilschließkörpers 3 an der Ventilsitzfläche 26 nicht abrupt verzögert, sondern bewegt sich gegen das Federelement 25, durch das der Anker 17 in seiner Bewegung abgebremst wird. Das Federelement 25 bewirkt eine Dämpfung des Anschlags des Ankers 17 am dem Anschlagkörper 20 gegenüberliegenden zweiten Ankeranschlag, der hier erfindungsgemäß das Federelement 25 selbst ist.By the between the stopper body 20 and the Spring element 25 created movement play of the armature 17th is a decoupling of the inertial masses of the armature 17th on the one hand and the valve needle 2 and the Valve closing body 3 on the other hand achieved. In the Closing movement of the valve needle 2 strikes a Valve seat surface 26 of the valve seat body 4 therefore only the inert mass of the valve needle 2 on. The armature 17 is at the Impact of the valve closing body 3 at the Valve seat surface 26 is not abruptly delayed, but moves against the spring element 25, through which the armature 17 in slowed down his movement. The spring element 25 causes an attenuation of the stop of the armature 17 at the Stopper 20 opposite second anchor stop, the here according to the invention, the spring element 25 itself.

In Figur 2 ist der erfindungsgemäße Ausschnitt rund um den Anker 17 in einem geänderten Maßstab dargestellt. Die Anordnung des axial beweglichen Ankers 17 zwischen seinen beiden Anschlägen wird dabei besonders deutlich, wobei der Anschlagkörper 20 in einer gegenüber Figur 1 vereinfachten Bauweise gezeigt ist. Das Federelement 25 dient erstens als unterer Anschlag für den Anker 17, zweitens als Dämpfungselement, das die Bewegung des Ankers 17 kontinuierlich abbremst und auf diese Weise ein Prellen der Ventilnadel 2 an der Ventilsitzfläche 26 vermeidet bzw. stark einschränkt, und drittens als Schiebefeder, die den Anker 17 in seine Ruhestellung zur Anlage am Anschlagkörper 20 drückt. In vorteilhafter Weise wird mit einem Bauteil eine sehr hohe Funktionsintegration erreicht.In Figure 2, the neck of the invention around the Anchor 17 shown in a modified scale. The Arrangement of the axially movable armature 17 between his Both attacks is particularly clear, the Stop body 20 in a simplified compared to Figure 1 Construction is shown. The spring element 25 serves first as bottom stop for the anchor 17, second as Damping element, the movement of the armature 17th decelerates continuously and in this way a bouncing of the Valve needle 2 on the valve seat surface 26 avoids or severely restricts, and third, as a sliding spring, the Anchor 17 in its rest position to rest on the stop body 20 presses. Advantageously, with a component achieved a very high functional integration.

Das Federelement 25 ist in vorteilhafter Weise mit einem rohrförmigen Schaft 38 und mit mehreren davon ausgehenden Federarmen 39 ausgebildet. Der Schaft 38 des Federelements 25 umgreift unmittelbar die Ventilnadel 2 und liegt an dieser an. Dabei sind zwei verschiedene Ausführungsformen des Schaftes 38 denkbar, wie die Figuren 3 und 4 verdeutlichen, die Schnitte entlang der Linie III-III in Figur 2 darstellen. Bei dem Beispiel gemäß Figur 3 liegt der Schaft 38 hülsenförmig an der einen kreisförmigen Querschnitt aufweisenden Ventilnadel 2 unmittelbar und in Umfangsrichtung vollständig umlaufend an. Dagegen ist der Schaft 38 gemäß Figur 4 mit z.B. drei axial verlaufenden Rippen 41 ausgebildet, die von der Ventilnadel 2 wegstehen und in einem jeweiligen Abstand von 120° angeordnet sind. Diese axialen Rippen 41 erhöhen die radiale Elastizität des Federelements 25 und erlauben größere Toleranzen für die zur Herstellung einer festen Verbindung auf der Ventilnadel 2 notwendige Presspassung. Außerdem wird auf diese Weise eine große Angriffsfläche geschaffen, um das Federelement 25 axial auf der Ventilnadel 2 verschieben zu können, was bei der Montage und der Einstellung des Federelements 25 erforderlich ist.The spring element 25 is advantageously with a tubular shaft 38 and with several outgoing therefrom Spring arms 39 formed. The shaft 38 of the spring element 25 immediately surrounds the valve needle 2 and is applied this one. There are two different embodiments the shaft 38 conceivable as the figures 3 and 4 clarify the sections along the line III-III in Figure 2 represent. In the example of Figure 3 is the Shank 38 sleeve-shaped on the one circular Cross-section valve needle 2 directly and in Circumferential direction completely circumferential. In contrast, the Shaft 38 according to FIG. 4 with e.g. three axially extending Ribs 41 formed, which protrude from the valve needle 2 and are arranged at a respective distance of 120 °. These axial ribs 41 increase the radial elasticity of the Spring element 25 and allow greater tolerances for the Production of a firm connection on the valve needle 2 necessary press fit. In addition, this way a created large attack surface to the spring element 25th to move axially on the valve needle 2, which is at the assembly and the adjustment of the spring element 25th is required.

Neben der bereits genannten Ausbildung der Paarung Ventilnadel 2/Federelement 25 mit einer Presspassung zur Erzielung einer festen Pressverbindung ist es zudem möglich, zur weiteren Sicherung im Bereich des Schaftes 38 einen oder mehrere Schweißpunkte oder -nähte 40 zu setzen, wie dies in Figur 2 auf der rechten Seite angedeutet ist. Das z.B. aus rostfreiem Federstahlblech ausgeformte Federelement 25 wird beispielsweise durch Tiefziehen und anschließendes Stanzen in seine gewünschte Form gebracht. Die eigentliche Federwirkung wird durch die Federarme 39 erzielt, die aus dem Schaft 38 hervorgehen und sich von der Ventilnadel 2 abspreizen. Die Federarme 39 erstrecken sich dabei fingerartig über den gesamten Umfang vom Schaft 38 weg, wobei jeder einzelne Federarm 39 unter einer Federspannung gewölbt ist. Wie Figur 2 zu entnehmen ist, sind die Federarme 39 derart gewölbt, dass der Anker 17 mit seinem Randbereich nahe des Außenumfangs an Außenbereichen 42 zur Anlage an den Federarmen 39 kommt, so dass ein Verkippen des Ankers 17 ausgeschlossen werden kann. Das radiale Ende der Federarme 39 bilden hinter den zur Ankerauflage dienenden Außenbereichen 42 Federarmenden 44, die wieder vom Anker 17 weggebogen sind, so dass keine scharfen Kanten am Anker 17 anliegen.In addition to the already mentioned training of mating Valve needle 2 / spring element 25 with a press fit to Achieving a firm press connection, it is also possible for further securing in the region of the shaft 38 a or several weld points or seams 40 to put, as shown in Figure 2 is indicated on the right side. The e.g. out stainless spring steel sheet molded spring element 25 is for example, by deep drawing and subsequent punching brought into its desired shape. The real one Spring action is achieved by the spring arms 39, the off the shaft 38 emerge and from the valve needle. 2 abspreizen. The spring arms 39 extend finger-like over the entire circumference of the shaft 38 away, wherein each individual spring arm 39 under a spring tension is arched. As can be seen from Figure 2, the Spring arms 39 arched such that the armature 17 with his Edge region near the outer periphery at outer areas 42 to Attachment to the spring arms 39 comes, so that a tilting of the Ankers 17 can be excluded. The radial end of the Spring arms 39 form behind the armature pad serving Outside 42 Federarmenden 44, the back of the anchor 17th are bent away, so that no sharp edges on the anchor 17th issue.

Figur 5 zeigt eine Draufsicht auf ein Federelement 25 mit sechs über den Umfang verteilten Federarmen 39. Eine andere Anzahl an Federarmen 39 des Federelements 25 ist jedoch ebenso denkbar. Die Federarme 39 weisen z.B. entsprechend des Biegemomentenverlaufs radial nach außen hin eine geringere Breite auf als zum Schaft 38 hin.Figure 5 shows a plan view of a spring element 25 with six spring arms 39 distributed over the circumference. Another Number of spring arms 39 of the spring element 25 is however just as conceivable. The spring arms 39 have e.g. corresponding of the bending moment curve radially outward one smaller width than the shaft 38 out.

Claims (8)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, having a solenoid (15), having an armature (17) on which the solenoid (15) acts in a travel direction, and having a valve needle (2) which is connected to a valve closing element (3), the armature (17) being movable between a first stop (20) which is connected to the valve needle (2) and bounds the movement of the armature (17) in the travel direction, and a second stop (25) which is connected to the valve needle (2) and bounds the movement of the armature (17) counter to the travel direction, and the second stop is formed by a spring element (25), characterized in that the spring element (25) is a spring washer or a damping spring which is firmly attached to the valve needle (2).
  2. Fuel injection valve according to Claim 1, characterized in that the spring element (25) is pressed onto the valve needle (2).
  3. Fuel injection valve according to Claim 2, characterized in that the spring element (25) is additionally secured to the valve needle (2) by means of at least one welding point (40) or one welding seam.
  4. Fuel injection valve according to one of the preceding claims, characterized in that the spring element (25) has a stem (38) which surrounds the valve needle (2), and a plurality of spring arms (39) which project from the stem (38).
  5. Fuel injection valve according to Claim 4, characterized in that the stem (38) has a plurality of axial ribs (41) over its circumference, which ribs (41) protrude from the valve needle (2).
  6. Fuel injection valve according to Claim 4 or 5, characterized in that the spring arms (39) are embodied so as to be curved with a spring stress.
  7. Fuel injection valve according to one of Claims 4 to 6, characterized in that the armature (17) comes to bear with its edge region on the edge of the outer circumference against the spring arms (39) at external regions (42) which are remote from the valve needle (2).
  8. Fuel injection valve according to one of the preceding claims, characterized in that the spring element (25) can be manufactured by deep drawing and punching from a piece of spring sheet steel.
EP99962123A 1999-06-18 1999-12-02 Fuel injection valve Expired - Lifetime EP1105639B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19927900A DE19927900A1 (en) 1999-06-18 1999-06-18 Fuel injection valve for direct injection IC engine has movement of armature limited by opposing stops attached to valve needle one of which is provided by spring element
DE19927900 1999-06-18
PCT/DE1999/003868 WO2000079120A1 (en) 1999-06-18 1999-12-02 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1105639A1 EP1105639A1 (en) 2001-06-13
EP1105639B1 true EP1105639B1 (en) 2005-01-26

Family

ID=7911710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99962123A Expired - Lifetime EP1105639B1 (en) 1999-06-18 1999-12-02 Fuel injection valve

Country Status (6)

Country Link
US (1) US6520434B1 (en)
EP (1) EP1105639B1 (en)
JP (1) JP2003502573A (en)
KR (1) KR20010072511A (en)
DE (2) DE19927900A1 (en)
WO (1) WO2000079120A1 (en)

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Also Published As

Publication number Publication date
DE59911528D1 (en) 2005-03-03
JP2003502573A (en) 2003-01-21
KR20010072511A (en) 2001-07-31
DE19927900A1 (en) 2000-12-21
WO2000079120A1 (en) 2000-12-28
US6520434B1 (en) 2003-02-18
EP1105639A1 (en) 2001-06-13

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