EP2864624B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP2864624B1
EP2864624B1 EP13724604.7A EP13724604A EP2864624B1 EP 2864624 B1 EP2864624 B1 EP 2864624B1 EP 13724604 A EP13724604 A EP 13724604A EP 2864624 B1 EP2864624 B1 EP 2864624B1
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EP
European Patent Office
Prior art keywords
tension spring
injection valve
valve
valve element
armature
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.)
Not-in-force
Application number
EP13724604.7A
Other languages
German (de)
French (fr)
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EP2864624A1 (en
Inventor
Philipp Rogler
Martin Scheffel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2864624A1 publication Critical patent/EP2864624A1/en
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Publication of EP2864624B1 publication Critical patent/EP2864624B1/en
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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
    • 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
    • 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
    • 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
    • F02M51/0628—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a stepped armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring

Definitions

  • a fuel injection valve for directly injecting fuel into the combustion chamber of a mixture-compression, spark-ignited internal combustion engine.
  • the injection valve comprises an armature, which cooperates with a magnet coil, and a valve pin which is connected non-positively to the armature, on which a valve closing body is provided, which forms a sealing seat together with a valve seat surface.
  • the armature is mounted by a spring swinging on the valve needle.
  • the spring is a compression spring which is clamped between a lower stop flange on the valve needle and a pot bottom of a spring mounted on the anchor pot.
  • the present invention relates to an injection valve, in particular for injecting fuel into an internal combustion engine.
  • a compression spring 107 is supported at one end against a fixedly mounted on the valve needle 101 sleeve 106. The other end of the compression spring 107 is supported against the spring cup 105.
  • the compression spring 107 causes the armature 104 is applied to the sleeve 106. The armature 104 is thus pressed by the compression spring 107 in the rest position.
  • the spring cup 105 transmits the force of the compression spring 107 to the armature 104.
  • the injection valve according to the invention in particular for injecting fuel into an internal combustion engine, comprising a housing with at least one injection opening and a magnet armature linearly movable in the housing.
  • An energizable solenoid coil acts on the magnet armature.
  • a pole core can still be provided in the housing.
  • a linearly movable valve element is provided for opening and closing the injection opening.
  • the valve element is linearly movable both with respect to the housing and with respect to the armature.
  • a first stop is formed on the valve element. It is provided a tension spring which pulls the armature against the first stop. By definition, a tension spring is loaded to train and contracts again by itself.
  • the armature is on the valve element.
  • the valve element itself is preferably composed of a valve needle which acts on a valve ball. On the valve needle sits the armature and is movable with respect to the valve needle.
  • a first bearing surface facing away from the combustion chamber is formed on the magnet armature.
  • the tension spring can rest with one end on this first bearing surface.
  • a second, combustion chamber-facing bearing surface is formed on the valve element, in particular on the sleeve which forms the first stop.
  • the tension spring can rest with its second end on this second bearing surface.
  • a circumferential groove is preferably formed on the first and / or on the second bearing surface.
  • the ends of the spring can be positively received in these grooves.
  • these grooves are semicircular, so that the wire of a spiral spring can be positively accommodated therein.
  • the first bearing surface on the armature is particularly preferably formed by a puncture in the armature.
  • the magnet armature thus has a radially inwardly pointing shoulder on which the first bearing surface is formed. This reduces the mass of the armature and thus improves the valve dynamics and noise.
  • the puncture on the armature is designed so that the magnetic flux from the magnetic coil or from the inner pole is influenced only insignificantly by the armature and thus the magnetic force is only slightly reduced.
  • a cohesive connection of the tension spring with the armature and / or with the valve element is provided.
  • the tension spring is welded.
  • the tension spring is designed in particular as a self-contracting spiral spring.
  • a closing pressure spring acting on the valve element in the closing direction is provided.
  • This closing pressure spring acts against a further sleeve on the valve element.
  • the magnet armature is preferably arranged between the sleeve forming the first stop and the further sleeve on the valve element.
  • FIG. 1 shows in half section an injection valve 100 according to the first embodiment.
  • the representation is simplified schematically.
  • a housing 2 of the injection valve 1 is merely indicated.
  • a valve element 5 extends in the housing 2 along a longitudinal axis 4.
  • the valve element 5 comprises a valve needle 6, which acts on a valve ball 7.
  • a spray opening 3 in the housing 2 is formed on the combustion chamber facing side of the housing 2.
  • Fuel can be injected from the interior of the housing 2 into a combustion chamber via this injection opening 3.
  • the Valve ball 7 of the valve element 5 forms a valve seat 8 for sealing the injection opening 3 in the lower region of the housing 2.
  • a magnet armature 12 is mounted on the valve needle 6.
  • the armature 12 is linearly movable between the first stop 9 and the second stop 10 along the longitudinal axis 4 relative to the valve element 5.
  • a magnetic coil 13 is provided which acts magnetically on the magnet armature 12 and thus sets the magnet armature 12 in motion.
  • About the first stop 9 and the second stop 10 of the armature 12 takes the valve element 5, so that the valve element 5 is moved along the longitudinal axis 4.
  • a combustion chamber facing side of the first stop 9 is referred to as a second support surface 16.
  • the other end of the tension spring 14 rests on this second bearing surface 16.
  • injection valve 1 In the following, further embodiments of the injection valve 1 will be explained. Identical or functionally identical components are provided with the same reference numerals in all embodiments. In the FIGS. 2 to 4 only a detail of the respective injection valve 1 is shown.
  • FIG. 2 shows the injection valve 1 according to the second embodiment.
  • each circumferential groove 18 are provided in the first support surface 15 and in the second support surface 16.
  • the contour of the groove 18 corresponds to the ends of the tension spring 14.
  • the tension spring 14 is formed as a spiral spring. Accordingly, the tension spring 14 is formed by a bent wire having a round cross section.
  • the grooves 18 have a corresponding semicircular cross-section. The grooves 18 take the tension spring 14 in a form-fitting manner.
  • FIG. 4 shows the injection valve 1 according to the fourth embodiment.
  • a weld joint 20 between the tension spring 14 and the armature 12 is shown.
  • Such a welded joint 20 is possible in all embodiments, both between the tension spring 14 and the armature 12 and between the tension spring 14 and the first stop 9.

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

Description

Stand der TechnikState of the art

Aus der DE 10 2004 024 533 A1 ist bereits ein Brennstoffeinspritzventil zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine bekannt. Das Einspritzventil umfasst einen Anker, der mit einer Magnetspule zusammenwirkt, und eine kraftschlüssig mit dem Anker verbundene Ventilnadel, an der ein Ventilschließkörper vorgesehen ist, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet. Der Anker ist durch eine Feder schwingend auf der Ventilnadel gelagert. Bei der Feder handelt es sich um eine Druckfeder, die zwischen einem unteren Anschlagflansch an der Ventilnadel und einem Topfboden eines an dem Anker befestigten Federaufnahmetopfes eingespannt ist.From the DE 10 2004 024 533 A1 For example, a fuel injection valve for directly injecting fuel into the combustion chamber of a mixture-compression, spark-ignited internal combustion engine is already known. The injection valve comprises an armature, which cooperates with a magnet coil, and a valve pin which is connected non-positively to the armature, on which a valve closing body is provided, which forms a sealing seat together with a valve seat surface. The armature is mounted by a spring swinging on the valve needle. When the spring is a compression spring which is clamped between a lower stop flange on the valve needle and a pot bottom of a spring mounted on the anchor pot.

Die vorliegende Erfindung betrifft ein Einspritzventil, insbesondere zum Einspritzen von Brennstoff in eine Brennkraftmaschine.The present invention relates to an injection valve, in particular for injecting fuel into an internal combustion engine.

Der Stand der Technik kennt Einspritzventile unter anderem zum Direkteinspritzen von Ottokraftstoff, mit einer Ventilnadel, die von einem Aktor gegen eine Schließfeder so bewegt wird, dass eine gewünschte Kraftstoffmenge gezielt direkt in den Brennraum eingebracht wird. Dabei kann bei einem Magnetventil der Magnetanker von der Ventilnadel entkoppelt sein, so dass die Ventilnadelgruppe einen Ankerfreiweg besitzt. Solch ein vorbekanntes Einspritzventil 100 zeigt Figur 5. Das vorbekannte Einspritzventil 100 weist ein Gehäuse 102 und eine am Gehäuse 102 angeordnete Ventilnadel 101 auf. Die Ventilnadel 101 steckt in einem Magnetanker 104. Der Magnetanker 104 wird über eine Magnetspule 103 bewegt. An dem Magnetanker 104 ist ein Federtopf 105 befestigt. Eine Druckfeder 107 stützt sich mit einem Ende gegen eine auf der Ventilnadel 101 fest montierte Hülse 106. Das andere Ende der Druckfeder 107 stützt sich gegen den Federtopf 105. Die Druckfeder 107 bewirkt, dass der Magnetanker 104 an der Hülse 106 anliegt. Der Magnetanker 104 wird also von der Druckfeder 107 in die Ruheposition gedrückt. Der Federtopf 105 überträgt die Kraft der Druckfeder 107 auf den Magnetanker 104.The prior art knows injection valves, inter alia, for direct injection of gasoline, with a valve needle which is moved by an actuator against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber. In this case, in the case of a solenoid valve, the magnet armature can be decoupled from the valve needle, so that the valve needle group has an armature free path. Such a prior art injector 100 shows FIG. 5 , The previously known injection valve 100 has a housing 102 and a valve needle 101 arranged on the housing 102. The valve needle 101 is inserted in a magnet armature 104. The magnet armature 104 is moved via a magnetic coil 103. At the armature 104, a spring cup 105 is attached. A compression spring 107 is supported at one end against a fixedly mounted on the valve needle 101 sleeve 106. The other end of the compression spring 107 is supported against the spring cup 105. The compression spring 107 causes the armature 104 is applied to the sleeve 106. The armature 104 is thus pressed by the compression spring 107 in the rest position. The spring cup 105 transmits the force of the compression spring 107 to the armature 104.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Einspritzventil mit den Merkmalen des Anspruchs 1 nutzt eine Zugfeder, um den Magnetanker in seine Ruheposition an einem Anschlag am Ventilelement zu ziehen. Erfindungsgemäß bedarf das Zweimassensystem aus Magnetanker und Ventilelement keines Federtopfes. Dadurch reduziert sich die Anzahl der Bauteile. Des Weiteren reduziert sich die Anzahl der Schweißnähte, da kein Federtopf mehr befestigt wird und somit vereinfacht sich auch die Herstellung des Einspritzventils. Die erfindungsgemäß verwendete Zugfeder muss nicht mehr, wie die vorbekannte Druckfeder, stirnseitig angeschliffen werden, wodurch sich die Einzelteilkosten für die Feder reduzieren. Des Weiteren reduziert sich die Masse der Magnetankergruppe, da der Federtopf entfällt. Die dadurch verbesserte Ventildynamik reduziert das Geräuschverhalten des Ventils. All diese Vorteile werden erreicht durch das erfindungsgemäße Einspritzventil, insbesondere zum Einspritzen von Brennstoff in eine Brennkraftmaschine, umfassend ein Gehäuse mit zumindest einer Spritzöffnung und einen im Gehäuse linear beweglichen Magnetanker. Auf den Magnetanker wirkt eine bestrombare Magnetspule. Zusätzlich kann noch ein Polkern im Gehäuse vorgesehen werden. In dem Gehäuse ist ein linear bewegliches Ventilelement zum Öffnen und Verschließen der Spritzöffnung vorgesehen. Das Ventilelement ist sowohl gegenüber dem Gehäuse als auch gegenüber dem Magnetanker linear beweglich. An dem Ventilelement ist ein erster Anschlag ausgebildet. Es ist eine Zugfeder vorgesehen, die den Magnetanker gegen den ersten Anschlag zieht. Gemäß Definition wird eine Zugfeder auf Zug belastet und kontrahiert wieder von selbst.The injection valve according to the invention with the features of claim 1 uses a tension spring to pull the armature in its rest position on a stop on the valve element. According to the invention requires the two-mass system from magnet armature and valve element no spring cup. This reduces the number of components. Furthermore, the number of welds is reduced, since no more spring pot is attached and thus simplifies the production of the injection valve. The tension spring used in the invention no longer needs to be ground, as the previously known compression spring, the front side, thereby reducing the item costs for the spring. Furthermore, the mass of the magnet armature group is reduced because the spring cup is eliminated. The resulting improved valve dynamics reduce the noise behavior of the valve. All of these advantages are achieved by the injection valve according to the invention, in particular for injecting fuel into an internal combustion engine, comprising a housing with at least one injection opening and a magnet armature linearly movable in the housing. An energizable solenoid coil acts on the magnet armature. In addition, a pole core can still be provided in the housing. In the housing, a linearly movable valve element is provided for opening and closing the injection opening. The valve element is linearly movable both with respect to the housing and with respect to the armature. On the valve element, a first stop is formed. It is provided a tension spring which pulls the armature against the first stop. By definition, a tension spring is loaded to train and contracts again by itself.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Bevorzugt steckt der Magnetanker auf dem Ventilelement. Das Ventilelement selbst setzt sich bevorzugt zusammen aus einer Ventilnadel, die auf eine Ventilkugel wirkt. Auf der Ventilnadel sitzt der Magnetanker und ist bezüglich der Ventilnadel beweglich.Preferably, the armature is on the valve element. The valve element itself is preferably composed of a valve needle which acts on a valve ball. On the valve needle sits the armature and is movable with respect to the valve needle.

Die Zugfeder ist insbesondere radial klemmend ausgebildet. Dadurch ist eine sichere Verbindung der Enden der Zugfeder mit dem Magnetanker bzw. mit dem Ventilelement möglich. Insbesondere ist vorgesehen, dass ein erstes Ende der Zugfeder direkt mit dem Magnetanker verbunden ist und dass ein zweites Ende der Zugfeder direkt mit dem ersten Anschlag verbunden ist. Dieser erste Anschlag wird insbesondere als eine fest mit dem Ventilelement verbundene Hülse ausgebildet.The tension spring is formed in particular radially clamping. As a result, a secure connection of the ends of the tension spring with the armature or with the valve element is possible. In particular, it is provided that a first end of the tension spring is connected directly to the armature and that a second end of the tension spring is directly connected to the first stop. This first stop is designed, in particular, as a sleeve fixedly connected to the valve element.

Für die genaue Verbindung zwischen Zugfeder und Magnetanker bzw. zwischen Zugfeder und Ventilelement gibt es verschiedene Ausgestaltungen. Diese verschiedenen Ausgestaltungen sind untereinander auch kombinierbar.For the exact connection between tension spring and armature or between tension spring and valve element, there are various configurations. These different configurations can also be combined with one another.

So ist insbesondere vorgesehen, dass am Magnetanker eine erste, brennraumabgewandte Auflagefläche ausgebildet ist. Die Zugfeder kann mit einem Ende auf dieser ersten Auflagefläche aufliegen.It is thus provided, in particular, that a first bearing surface facing away from the combustion chamber is formed on the magnet armature. The tension spring can rest with one end on this first bearing surface.

Des Weiteren ist vorgesehen, dass am Ventilelement, insbesondere an der Hülse die den ersten Anschlag bildet, eine zweite, brennraumzugewandte Auflagefläche ausgebildet ist. Die Zugfeder kann mit ihrem zweiten Ende auf dieser zweiten Auflagefläche aufliegen.Furthermore, it is provided that on the valve element, in particular on the sleeve which forms the first stop, a second, combustion chamber-facing bearing surface is formed. The tension spring can rest with its second end on this second bearing surface.

Auf der ersten und/oder auf der zweiten Auflagefläche wird bevorzugt eine umlaufende Nut ausgebildet. Die Enden der Feder können in diesen Nuten formschlüssig aufgenommen werden. Insbesondere sind diese Nuten halbrund, so dass der Draht einer spiralförmigen Feder darin formschlüssig aufgenommen werden kann.On the first and / or on the second bearing surface, a circumferential groove is preferably formed. The ends of the spring can be positively received in these grooves. In particular, these grooves are semicircular, so that the wire of a spiral spring can be positively accommodated therein.

Die erste Auflagefläche am Magnetanker wird besonders bevorzugt durch einen Einstich im Magnetanker gebildet. Der Magnetanker weist also einen radial nach innen zeigenden Absatz auf, an dem die erste Auflagefläche ausgebildet ist. Dadurch wird die Masse des Magnetankers reduziert und somit die Ventildynamik und die Geräuschentwicklung verbessert. Der Einstich am Magnetanker wird so gestaltet, dass der magnetische Fluss von der Magnetspule bzw. vom Innenpol durch den Magnetanker nur unwesentlich beeinflusst wird und dadurch die Magnetkraft nur unwesentlich reduziert wird.The first bearing surface on the armature is particularly preferably formed by a puncture in the armature. The magnet armature thus has a radially inwardly pointing shoulder on which the first bearing surface is formed. This reduces the mass of the armature and thus improves the valve dynamics and noise. The puncture on the armature is designed so that the magnetic flux from the magnetic coil or from the inner pole is influenced only insignificantly by the armature and thus the magnetic force is only slightly reduced.

Zusätzlich oder alternativ zur Auflage der Zugfeder auf der ersten und/oder zweiten Auflagefläche ist eine stoffschlüssige Verbindung der Zugfeder mit dem Magnetanker und/oder mit dem Ventilelement vorgesehen. Insbesondere wird die Zugfeder verschweißt.Additionally or alternatively to the support of the tension spring on the first and / or second bearing surface, a cohesive connection of the tension spring with the armature and / or with the valve element is provided. In particular, the tension spring is welded.

Die Zugfeder wird insbesondere als selbstkontrahierende Spiralfeder ausgebildet.The tension spring is designed in particular as a self-contracting spiral spring.

Des Weiteren ist eine auf das Ventilelement in Schließrichtung wirkende Schließdruckfeder vorgesehen. Diese Schließdruckfeder wirkt gegen eine weitere Hülse am Ventilelement. Der Magnetanker ist bevorzugt zwischen der den ersten Anschlag bildenden Hülse und der weiteren Hülse auf dem Ventilelement angeordnet.Furthermore, a closing pressure spring acting on the valve element in the closing direction is provided. This closing pressure spring acts against a further sleeve on the valve element. The magnet armature is preferably arranged between the sleeve forming the first stop and the further sleeve on the valve element.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Nachfolgend werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. Dabei zeigen:

Figur 1
ein erfindungsgemäßes Einspritzventil gemäß einem ersten Ausführungsbeispiel,
Figur 2
ein Detail eines erfindungsgemäßen Einspritzventils gemäß einem zweiten Ausführungsbeispiel;
Figur 3
ein Detail eines erfindungsgemäßen Einspritzventils gemäß einem dritten Ausführungsbeispiel;
Figur 4
ein Detail eines erfindungsgemäßen Einspritzventils gemäß einem vierten Ausführungsbeispiel, und
Figur 5
ein Einspritzventil gemäß dem Stand der Technik.
Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings. Showing:
FIG. 1
an inventive injection valve according to a first embodiment,
FIG. 2
a detail of an injection valve according to the invention according to a second embodiment;
FIG. 3
a detail of an injection valve according to the invention according to a third embodiment;
FIG. 4
a detail of an injection valve according to the invention according to a fourth embodiment, and
FIG. 5
an injection valve according to the prior art.

Ausführungsformen der ErfindungEmbodiments of the invention

Figur 1 zeigt im Halbschnitt ein Einspritzventil 100 gemäß dem ersten Ausführungsbeispiel. Die Darstellung ist schematisch vereinfacht. Insbesondere ein Gehäuse 2 des Einspritzventils 1 ist lediglich angedeutet. FIG. 1 shows in half section an injection valve 100 according to the first embodiment. The representation is simplified schematically. In particular, a housing 2 of the injection valve 1 is merely indicated.

In dem Gehäuse 2 erstreckt sich entlang einer Längsachse 4 ein Ventilelement 5. Das Ventilelement 5 umfasst eine Ventilnadel 6, die auf eine Ventilkugel 7 wirkt. An der brennraumzugewandten Seite des Gehäuses 2 ist eine Spritzöffnung 3 im Gehäuse 2 ausgebildet. Über diese Spritzöffnung 3 kann Brennstoff aus dem Innenraum des Gehäuses 2 in einen Brennraum eingespritzt werden. Die Ventilkugel 7 des Ventilelementes 5 bildet im unteren Bereich des Gehäuses 2 einen Ventilsitz 8 zum Abdichten der Spritzöffnung 3.A valve element 5 extends in the housing 2 along a longitudinal axis 4. The valve element 5 comprises a valve needle 6, which acts on a valve ball 7. On the combustion chamber facing side of the housing 2, a spray opening 3 in the housing 2 is formed. Fuel can be injected from the interior of the housing 2 into a combustion chamber via this injection opening 3. The Valve ball 7 of the valve element 5 forms a valve seat 8 for sealing the injection opening 3 in the lower region of the housing 2.

Auf dem Ventilelement 5, insbesondere auf der Ventilnadel 6, ist ein erster Anschlag 9, ausgebildet als erste Hülse, befestigt. Des Weiteren befindet sich auf der Ventilnadel 6 ein zweiter Anschlag 10, ausgebildet als zweite Hülse. Die erste und/oder zweite Hülse können als separate Bauteile fest auf der Ventilnadel 6 montiert werden. Alternativ kann eine der beiden Hülsen integral mit der Ventilnadel 6 gefertigt werden. Am zweiten Anschlag 10 greift eine Schließdruckfeder 11 an, die das Ventilelement 5 in Schließrichtung drückt.On the valve element 5, in particular on the valve needle 6, a first stop 9, designed as a first sleeve, attached. Furthermore, located on the valve needle 6, a second stop 10, designed as a second sleeve. The first and / or second sleeve can be mounted as separate components fixed on the valve needle 6. Alternatively, one of the two sleeves can be made integral with the valve needle 6. At the second stop 10 engages a closing pressure spring 11, which presses the valve element 5 in the closing direction.

Zwischen dem ersten Anschlag 9 und dem zweiten Anschlag 10 ist ein Magnetanker 12 auf der Ventilnadel 6 montiert. Der Magnetanker 12 ist zwischen dem ersten Anschlag 9 und dem zweiten Anschlag 10 entlang der Längsachse 4 gegenüber dem Ventilelement 5 linear beweglich. Des Weiteren ist eine Magnetspule 13 vorgesehen, die magnetisch auf den Magnetanker 12 wirkt und somit den Magnetanker 12 in Bewegung versetzt. Über den ersten Anschlag 9 und den zweiten Anschlag 10 nimmt der Magnetanker 12 das Ventilelement 5 mit, so dass auch das Ventilelement 5 entlang der Längsachse 4 bewegt wird.Between the first stop 9 and the second stop 10, a magnet armature 12 is mounted on the valve needle 6. The armature 12 is linearly movable between the first stop 9 and the second stop 10 along the longitudinal axis 4 relative to the valve element 5. Furthermore, a magnetic coil 13 is provided which acts magnetically on the magnet armature 12 and thus sets the magnet armature 12 in motion. About the first stop 9 and the second stop 10 of the armature 12 takes the valve element 5, so that the valve element 5 is moved along the longitudinal axis 4.

Zwischen dem ersten Anschlag 9 und dem Magnetanker 12 ist eine radial klemmende Zugfeder 14 angeordnet. Diese Zugfeder 14 zieht den Magnetanker 12 auf den ersten Anschlag 9. Somit kann die Zugfeder 14 auch als Ankerfreiwegsfeder bezeichnet werden.Between the first stop 9 and the armature 12, a radially clamping tension spring 14 is arranged. This tension spring 14 pulls the armature 12 to the first stop 9. Thus, the tension spring 14 may also be referred to as Ankerfreiwegsfeder.

Im Magnetanker 12 ist ein Einstich 21 vorgesehen. Durch diesen Einstich 21 ist ein radial nach innen zeigender Absatz 17 am Magnetanker 12 ausgebildet. Auf diesem Absatz 17 ist eine erste, brennraumabgewandte Auflagefläche 15 ausgebildet. Ein erstes Ende der Zugfeder 14 liegt auf dieser ersten Auflagefläche 15 auf.In magnet armature 12, a recess 21 is provided. By this recess 21, a radially inwardly pointing paragraph 17 is formed on the armature 12. On this paragraph 17, a first combustion chamber facing away from support surface 15 is formed. A first end of the tension spring 14 rests on this first bearing surface 15.

Eine dem Brennraum zugewandte Seite des ersten Anschlags 9 wird als zweite Auflagefläche 16 bezeichnet. Das andere Ende der Zugfeder 14 liegt auf dieser zweiten Auflagefläche 16 auf.A combustion chamber facing side of the first stop 9 is referred to as a second support surface 16. The other end of the tension spring 14 rests on this second bearing surface 16.

Erfindungsgemäß ist also keine Druckfeder als Ankerfreiwegsfeder vorgesehen. Demgemäß bedarf es keines Federtopfes, wie im Stand der Technik. Dadurch reduziert sich die Bauteilanzahl und infolgedessen auch das Gewicht und die Herstellkosten für das erfindungsgemäße Einspritzventil 1.According to the invention therefore no compression spring is provided as Ankerfreiwegsfeder. Accordingly, it does not require a spring cup, as in the prior art. This reduces the number of components and, as a result, also the weight and the manufacturing costs for the injection valve 1 according to the invention.

Im Folgenden werden weitere Ausführungsbeispiele des Einspritzventils 1 erläutert. Gleiche bzw. funktional gleiche Bauteile sind in allen Ausführungsbeispielen mit denselben Bezugszeichen versehen. In den Figuren 2 bis 4 wird lediglich ein Detail des jeweiligen Einspritzventils 1 gezeigt.In the following, further embodiments of the injection valve 1 will be explained. Identical or functionally identical components are provided with the same reference numerals in all embodiments. In the FIGS. 2 to 4 only a detail of the respective injection valve 1 is shown.

Figur 2 zeigt das Einspritzventil 1 gemäß dem zweiten Ausführungsbeispiel. Im zweiten Ausführungsbeispiel sind in der ersten Auflagefläche 15 und in der zweiten Auflagefläche 16 jeweils umlaufende Nut 18 vorgesehen. Die Kontur der Nut 18 entspricht den Enden der Zugfeder 14. Im gezeigten Beispiel ist die Zugfeder 14 als Spiralfeder ausgebildet. Dementsprechend ist die Zugfeder 14 durch einen gebogenen Draht mit einem runden Querschnitt gebildet. Die Nuten 18 haben einen entsprechenden halbrunden Querschnitt. Die Nuten 18 nehmen die Zugfeder 14 formschlüssig auf. FIG. 2 shows the injection valve 1 according to the second embodiment. In the second embodiment, each circumferential groove 18 are provided in the first support surface 15 and in the second support surface 16. The contour of the groove 18 corresponds to the ends of the tension spring 14. In the example shown, the tension spring 14 is formed as a spiral spring. Accordingly, the tension spring 14 is formed by a bent wire having a round cross section. The grooves 18 have a corresponding semicircular cross-section. The grooves 18 take the tension spring 14 in a form-fitting manner.

Figur 3 zeigt das Einspritzventil gemäß dem dritten Ausführungsbeispiel. Im dritten Ausführungsbeispiel ist im ersten Anschlag 9 ein weiterer Einstich 19 vorgesehen. Durch den weiteren Einstich 19 wird die Zugfeder 14 am ersten Anschlag 9 formschlüssig aufgenommen und ein Verrutschen der Zugfeder 14 radial nach innen begrenzt. FIG. 3 shows the injection valve according to the third embodiment. In the third embodiment, a further recess 19 is provided in the first stop 9. By the further recess 19, the tension spring 14 is positively received on the first stop 9 and slipping of the tension spring 14 is limited radially inwardly.

Figur 4 zeigt das Einspritzventil 1 gemäß dem vierten Ausführungsbeispiel. Im vierten Ausführungsbeispiel ist eine Schweißverbindung 20 zwischen der Zugfeder 14 und dem Magnetanker 12 gezeigt. Solch eine Schweißverbindung 20 ist in allen Ausführungsbeispielen sowohl zwischen der Zugfeder 14 und dem Magnetanker 12 als auch zwischen der Zugfeder 14 und dem ersten Anschlag 9 möglich. FIG. 4 shows the injection valve 1 according to the fourth embodiment. In the fourth embodiment, a weld joint 20 between the tension spring 14 and the armature 12 is shown. Such a welded joint 20 is possible in all embodiments, both between the tension spring 14 and the armature 12 and between the tension spring 14 and the first stop 9.

Claims (10)

  1. Injection valve (1), in particular for the injection of fuel into an internal combustion engine, comprising
    - a housing (2) with at least one spray opening (3),
    - a magnet armature (12) which is linearly movable in the housing (2),
    - a magnet coil (13) which exerts a magnetic action on the magnet armature (12),
    - a valve element (5) which is linearly movable relative to the housing (2) and relative to the magnet armature (13), which valve element forms, together with the at least one spray opening (3), a valve seat (8),
    - a first stop (9) on the valve element (5), and
    - a tension spring (14) which pulls the magnet armature (12) against the first stop (9).
  2. Injection valve according to Claim 1, characterized in that the magnet armature (12) is plugged onto the valve element (5).
  3. Injection valve according to one of the preceding claims, characterized in that the first end of the tension spring (14) is connected directly to the magnet armature (12), and the second end of the tension spring (14) is connected directly to the first stop (9) .
  4. Injection valve according to one of the preceding claims, characterized by a first support surface (15), which is averted from the combustion chamber, on the magnet armature (12), wherein the tension spring (14) lies on the first support surface (15).
  5. Injection valve according to one of the preceding claims, characterized by a second support surface (16), which faces toward the combustion chamber, on the valve element (5), wherein the tension spring (14) lies on the second support surface (16) .
  6. Injection valve according to either of Claims 4 and 5, characterized in that, in the first support surface (15) and/or in the second support surface (16), there is formed an encircling groove (18) for receiving the tension spring (14) in positively locking fashion.
  7. Injection valve according to one of the preceding claims, characterized in that the tension spring (14) is connected cohesively to the magnet armature (12) and/or to the valve element (5).
  8. Injection valve according to one of the preceding claims, characterized in that the valve element (5) comprises a valve needle (6), wherein the first stop (9) is formed on a sleeve on the valve needle (6).
  9. Injection valve according to one of the preceding claims, characterized in that the tension spring (14) is formed as a self-contracting spiral spring.
  10. Injection valve according to one of the preceding claims, characterized by a closing compression spring (11) which acts on the valve element (5) in a closing direction.
EP13724604.7A 2012-06-20 2013-05-24 Injection valve Not-in-force EP2864624B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012210415A DE102012210415A1 (en) 2012-06-20 2012-06-20 Injector
PCT/EP2013/060761 WO2013189690A1 (en) 2012-06-20 2013-05-24 Injection valve

Publications (2)

Publication Number Publication Date
EP2864624A1 EP2864624A1 (en) 2015-04-29
EP2864624B1 true EP2864624B1 (en) 2016-04-27

Family

ID=48483094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13724604.7A Not-in-force EP2864624B1 (en) 2012-06-20 2013-05-24 Injection valve

Country Status (6)

Country Link
US (1) US9353715B2 (en)
EP (1) EP2864624B1 (en)
JP (1) JP6092375B2 (en)
KR (1) KR102075334B1 (en)
DE (1) DE102012210415A1 (en)
WO (1) WO2013189690A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2015039859A1 (en) * 2013-09-18 2015-03-26 Continental Automotive Gmbh Valve assembly for an injection valve and injection valve
US20170254304A1 (en) * 2014-09-17 2017-09-07 Denso Corporation Fuel injection valve
DE102015213216A1 (en) 2015-07-15 2017-01-19 Robert Bosch Gmbh Valve for metering a fluid
EP3260695B8 (en) 2016-06-24 2019-07-17 CPT Group GmbH Valve assembly for an injection valve and injection valve
FR3073903B1 (en) * 2017-11-23 2021-07-30 Delphi Int Operations Luxembourg Sarl FUEL INJECTOR

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Publication number Priority date Publication date Assignee Title
US3871615A (en) 1974-02-19 1975-03-18 Deltrol Corp Solenoid operated wedge gate valve
DE19816315A1 (en) * 1998-04-11 1999-10-14 Bosch Gmbh Robert Fuel injector
DE19855547A1 (en) * 1998-12-02 2000-06-08 Bosch Gmbh Robert Electromagnetically actuated valve
DE19950761A1 (en) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Fuel injection valve has supporting ring between elastomeric ring and armature that supports elastomeric ring axially near opening of fuel channel in armature and radially on shoulder
US6454191B1 (en) * 2000-01-10 2002-09-24 Delphi Technologies, Inc. Electromagnetic fuel injector dampening device
DE10108974A1 (en) * 2001-02-24 2002-09-05 Bosch Gmbh Robert Fuel injector
DE10108945A1 (en) * 2001-02-24 2002-09-05 Bosch Gmbh Robert Fuel injector
DE10136808A1 (en) * 2001-07-27 2003-02-13 Bosch Gmbh Robert IC engine fuel injection valve, has magnetic coils and two cooperating armatures with respective positioning springs between latter and valve needle flanges
DE10256948A1 (en) * 2002-12-05 2004-06-24 Robert Bosch Gmbh Fuel injector
DE60328355D1 (en) * 2003-03-19 2009-08-27 Continental Automotive Gmbh Injection valve with a spring biased needle
DE102004024533A1 (en) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Fuel injector
JP4576345B2 (en) * 2006-02-17 2010-11-04 日立オートモティブシステムズ株式会社 Electromagnetic fuel injection valve
DE102009002483A1 (en) * 2009-04-20 2010-10-21 Robert Bosch Gmbh Method for operating an injection valve

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JP2015519514A (en) 2015-07-09
KR102075334B1 (en) 2020-02-10
DE102012210415A1 (en) 2013-12-24
JP6092375B2 (en) 2017-03-08
KR20150023420A (en) 2015-03-05
EP2864624A1 (en) 2015-04-29
WO2013189690A1 (en) 2013-12-27
US9353715B2 (en) 2016-05-31
US20150152822A1 (en) 2015-06-04

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