EP2893182B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP2893182B1
EP2893182B1 EP13739435.9A EP13739435A EP2893182B1 EP 2893182 B1 EP2893182 B1 EP 2893182B1 EP 13739435 A EP13739435 A EP 13739435A EP 2893182 B1 EP2893182 B1 EP 2893182B1
Authority
EP
European Patent Office
Prior art keywords
stop
guide element
injection valve
valve needle
valve according
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
EP13739435.9A
Other languages
German (de)
French (fr)
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EP2893182A1 (en
Inventor
Philipp Rogler
Martin Scheffel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2893182A1 publication Critical patent/EP2893182A1/en
Application granted granted Critical
Publication of EP2893182B1 publication Critical patent/EP2893182B1/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
    • F02M51/0671—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
    • F02M51/0675—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 the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not 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
    • 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
    • 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies

Definitions

  • the present invention relates to an injection valve for injecting a medium, in particular for injecting fuel in a combustion chamber.
  • valves for the injection of gasoline with a valve needle which is moved by an actuator, such as an electromagnet or piezo actuator, against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber.
  • an injection valve is considered in which the armature is decoupled from the valve needle.
  • the armature should release itself quickly from the lower stop located on the valve needle, quickly overcome the armature free travel and quickly open the valve when hitting the upper stop. If the energization of the valve is terminated, the valve needle closes again. The armature, after the valve needle closes the valve seat, continues to move until it encounters the lower limit stop.
  • the armature bounces off one or more times if necessary, until it reaches its rest position again.
  • the time it takes for the armature to return to the rest position is critical to the ability of the valve to rapidly eject successive injections with high accuracy.
  • the injection valve according to the invention with the features of claim 1 allows a very fast recovery of the armature after closing the valve by an improved damping. This can do that Inject injection valve very precisely in quick succession.
  • the Ankerfreiweg is still adjustable.
  • the switching behavior and the quantitative metering of the injection valve are standardized and the actual values thus deviate as little as possible from the nominal value.
  • the costs for producing the valve needle can be reduced because the armature according to the invention is no longer guided on the valve needle, but on the guide element.
  • the valve needle therefore no longer has to be micromachined. It eliminates, for example, a grinding of the valve needle or it can be used without further reworking a rolled or drawn needle pin.
  • the injection valve which is used in particular for gasoline engines for duct or direct injection of fuel.
  • the injection valve comprises a housing with at least one injection opening on an outlet side, a magnetic coil and a magnetic armature that is linearly movable by the magnetic coil. Furthermore, a linearly movable valve needle for opening and closing the injection opening is provided.
  • the armature is linearly movable between a first stop and a second stop coaxial with the valve needle.
  • the valve needle is firmly connected to the guide element.
  • the outer surface of the guide element serves as a guide for the Linearbewegegung of the armature.
  • the second stop is an integral part of the guide element.
  • the guide of the magnet armature is formed integrally with the second stop.
  • the first stop is on the outlet side facing away from the armature and can thus be referred to as the upper stop.
  • the second stop is on the outlet side facing the armature and can thus be referred to as a lower stop.
  • a nip is defined between the armature and the second stop.
  • this nip there is the medium to be injected, so that the nip attenuates the movement of the armature when closing the injector and quickly restores the armature to its rest position.
  • the effectiveness of the nip depends on the minimum gap height of the nip.
  • the second stop is formed on a stop sleeve.
  • the stop sleeve in turn is welded to the valve needle.
  • the guide element, on which the second stop is formed is simultaneously used to guide the magnet armature. As a result, a predetermined angle between the second stop and the guide surface of the armature is fixed and remains unchanged even during the welding process.
  • the guide element is preferably designed as a plugged onto the valve needle sleeve.
  • the guide element extends as a solid body, the valve needle in the longitudinal direction.
  • the first stopper formed on a ring is attached to the guide element.
  • the ring is welded to the guide element. The distance between the two stops minus the height of the armature defines the armature free travel. This is set by positioning the ring on the guide element.
  • the ring is preferably designed in cross-section L-shaped.
  • the welding between the ring and guide element is preferably carried out on the side facing away from the outlet of the first stop.
  • the guide element is preferably welded to the valve needle.
  • the weld is preferably set only on the side facing the outlet of the second stop.
  • the guide element is made together with the second stop as a one-piece turned or milled part.
  • the second stop is perpendicular from the guide element.
  • the guide element has in particular a cylindrical outer surface on which the magnet armature is guided.
  • FIGS. 1 and 2 an injection valve 1 according to the first embodiment explained in detail. Identical or functionally identical components are provided with the same reference numerals in all embodiments.
  • the injection valve 1 comprises a housing 2.
  • the housing 2 is in FIG. 1 only partially and schematically shown. At least one injection opening 4 in the housing 2 is formed on an outlet side 3 of the injection valve 1. Furthermore, the housing 2 carries a magnetic coil 5.
  • the injection valve 1 further comprises a magnet armature 6 and a valve needle 7 with a ball 8.
  • the magnet armature 6 is linearly movable along a longitudinal axis 23 between a first stop 11 and a second stop 12. The distance between the two stops 11, 12 defines a Ankerokweg 13.
  • a first spring 9 loads the valve needle 7 in the direction of the outlet side 3.
  • a second spring 12 is connected via a spring cup 14 to the armature 6.
  • the second spring 10 also loads the magnet armature 6 via the spring cup 14 in the direction of the outlet side 3, so that the armature 6 rests against the second stop 12 by the force of the second spring 10.
  • channels 15 are formed. Through the channels 15 of the fuel to be injected can flow. Additionally or alternatively to the channels 15 and the valve needle 7 may be formed as a hollow needle.
  • FIG. 2 shows a detail of the injection valve 1. Based on FIG. 2 It is good to see that on the valve needle 7, a guide element 16, formed as a sleeve 16, inserted. An integral part of the guide member 16 is the second stop 12. The guide member 16 together with the second stop 12 is made as a one-piece rotary member. The guide element 16 extends over a guide element length 21. The magnet armature 6 extends over a magnet armature length 22. The lengths are measured parallel to the longitudinal axis 23. The guide element length 21 is substantially longer than the magnet armature length 22. As a result, the guide element 16 with its outer surface 18 completely guide the magnet armature 6. Due to the integral design of the second stop 12 on the guide element 16, a defined angle, in particular of 90 °, between the outer surface 18 and the second stop 12 is given.
  • the guide member 16 On the guide member 16 is a ring 17. At the ring 17, the first stop 11 is formed.
  • the ring 17 is L-shaped in cross section.
  • the ring 17 is connected via a first weld 19 with the guide member 16.
  • the guide element 16 in turn is connected to the valve needle 7 with a second weld 20.
  • Fig. 3 shows a detail of a second embodiment.
  • the guide member 16 is not formed as a sleeve, but as a solid body.
  • the valve needle 7 terminates below the guide element 16.
  • the guide element 16 extends the valve needle 7 along the longitudinal axis 23 at least to the ring 17.
  • the guide element 16 thus combines the guiding and stop function.
  • the embodiments can be constructed with a hollow or with a solid valve needle 7, which generally does not have to be symmetrical.
  • the guide member 16 is configured so that the serving for guiding outer surface 18 and the rectangular surface of the second stop 12 made in one setting, for example, rotated and / or ground can be.
  • the welds 19, 20 are preferably so far away from the guide and stop surface that these surfaces are not distorted by the welding process.

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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

Die vorliegende Erfindung betrifft ein Einspritzventil zum Einspritzen eines Mediums, insbesondere zum Einspritzen von Brennstoff in einem Brennraum.The present invention relates to an injection valve for injecting a medium, in particular for injecting fuel in a combustion chamber.

Der Stand der Technik zeigt Ventile zur Einspritzung von Ottokraftstoff mit einer Ventilnadel, die von einem Aktor, beispielsweise einem Elektromagneten oder Piezosteller, gegen eine Schließfeder so bewegt wird, dass eine gewünschte Kraftstoffmenge gezielt direkt in den Brennraum eingebracht wird. Im vorliegenden Fall wird ein Einspritzventil betrachtet, bei dem der Magnetanker von der Ventilnadel entkoppelt ist. Beim Öffnen des Ventils soll sich der Magnetanker schnell von dem an der Ventilnadel befindlichen unteren Anschlag lösen, den Ankerfreiweg schnell überwinden und beim Auftreffen auf den oberen Anschlag das Ventil schnell öffnen. Wird die Bestromung des Ventils beendet, schließt die Ventilnadel wieder. Der Magnetanker führt, nachdem die Ventilnadel den Ventilsitz wieder verschließt, seine Bewegung fort, bis er auf den unteren Anschlag trifft. Vom unteren Anschlag prellt der Magnetanker gegebenenfalls ein- oder mehrmals ab, bis er seine Ruheposition wieder erreicht. Die Zeit, bis der Magnetanker wieder in die Ruheposition zurückgestellt wird, ist entscheidend für die Fähigkeit des Ventils, schnell aufeinanderfolgende Einspritzungen mit hoher Genauigkeit abzusetzen.The prior art shows valves for the injection of gasoline with a valve needle, which is moved by an actuator, such as an electromagnet or piezo actuator, against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber. In the present case, an injection valve is considered in which the armature is decoupled from the valve needle. When the valve is opened, the armature should release itself quickly from the lower stop located on the valve needle, quickly overcome the armature free travel and quickly open the valve when hitting the upper stop. If the energization of the valve is terminated, the valve needle closes again. The armature, after the valve needle closes the valve seat, continues to move until it encounters the lower limit stop. From the bottom stop, the armature bounces off one or more times if necessary, until it reaches its rest position again. The time it takes for the armature to return to the rest position is critical to the ability of the valve to rapidly eject successive injections with high accuracy.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Einspritzventil mit den Merkmalen des Anspruchs 1 ermöglicht eine sehr schnelle Rückstellung des Magnetankers nach dem Schließen des Ventils durch eine verbesserte Dämpfung. Dadurch kann das Einspritzventil kurz nacheinander sehr präzise einspritzen. Der Ankerfreiweg ist dabei nach wie vor einstellbar. Das Schaltverhalten und die Mengenzumessung des Einspritzventils wird vereinheitlicht und die Istwerte weichen somit möglichst wenig vom Sollwert ab. Die Kosten zur Herstellung der Ventilnadel können reduziert werden, da der Magnetanker erfindungsgemäß nicht mehr auf der Ventilnadel, sondern auf dem Führungselement geführt wird. Die Ventilnadel muss deshalb nicht mehr feinstbearbeitet werden. Es entfällt beispielsweise ein Schleifen der Ventilnadel bzw. es kann ein gerollter oder gezogener Nadelstift ohne weitere Nachbearbeitung verwendet werden. All diese Vorteile werden erreicht durch das erfindungsgemäße Einspritzventil, welches insbesondere bei Ottomotoren zur Kanal- oder Direkteinspritzung von Kraftstoff genutzt wird. Das Einspritzventil umfasst ein Gehäuse mit zumindest einer Spritzöffnung an einer Auslassseite, eine Magnetspule und einen durch die Magnetspule linear beweglichen Magnetanker. Des Weiteren ist eine linearbewegliche Ventilnadel zum Öffnen und Schließen der Spritzöffnung vorgesehen. Der Magnetanker ist zwischen einem ersten Anschlag und einem zweiten Anschlag koaxial zur Ventilnadel linear beweglich. Erfindungsgemäß ist die Ventilnadel fest mit dem Führungselement verbunden. Die Außenfläche des Führungselements dient dabei als Führung für die Linearbewegegung des Magnetankers. Gleichzeitig ist der zweite Anschlag ein integraler Bestandteil des Führungselements. Somit ist die Führung des Magnetankers einstückig mit dem zweiten Anschlag ausgebildet. Der erste Anschlag ist auf der auslassabgewandten Seite des Magnetankers und kann somit als oberer Anschlag bezeichnet werden. Der zweite Anschlag ist auf der auslasszugewandten Seite des Magnetankers und kann somit als unterer Anschlag bezeichnet werden. Zwischen dem Magnetanker und dem zweiten Anschlag ist üblicherweise ein Quetschspalt definiert. In diesem Quetschspalt befindet sich das einzuspritzende Medium, so dass der Quetschspalt beim Schließen des Einspritzventils die Bewegung des Magnetankers dämpft und den Magnetanker schnell in seine Ruheposition zurückstellt. Die Wirksamkeit des Quetschspaltes hängt von der minimalen Spalthöhe des Quetschspaltes ab. Bei vorbekannten Einspritzventilen ist der zweite Anschlag an einer Anschlaghülse ausgebildet. Die Anschlaghülse wiederum ist auf der Ventilnadel verschweißt. Bei diesem Verschweißen erfolgt ein Verkippen der Anschlaghülse und somit auch des zweiten Anschlags gegenüber der Ventilnadel, wodurch die Spalthöhe des Quetschspaltes ungünstig verändert wird. Dies wird erfindungsgemäß dadurch vermieden, dass das Führungselement, an dem der zweite Anschlag ausgebildet ist, gleichzeitig zur Führung des Magnetankers verwendet wird. Infolgedessen ist ein vorbestimmter Winkel zwischen dem zweiten Anschlag und der Führungsfläche des Magnetankers fest vorgegeben und bleibt auch bei dem Schweißvorgang unverändert.The injection valve according to the invention with the features of claim 1 allows a very fast recovery of the armature after closing the valve by an improved damping. This can do that Inject injection valve very precisely in quick succession. The Ankerfreiweg is still adjustable. The switching behavior and the quantitative metering of the injection valve are standardized and the actual values thus deviate as little as possible from the nominal value. The costs for producing the valve needle can be reduced because the armature according to the invention is no longer guided on the valve needle, but on the guide element. The valve needle therefore no longer has to be micromachined. It eliminates, for example, a grinding of the valve needle or it can be used without further reworking a rolled or drawn needle pin. All these advantages are achieved by the injection valve according to the invention, which is used in particular for gasoline engines for duct or direct injection of fuel. The injection valve comprises a housing with at least one injection opening on an outlet side, a magnetic coil and a magnetic armature that is linearly movable by the magnetic coil. Furthermore, a linearly movable valve needle for opening and closing the injection opening is provided. The armature is linearly movable between a first stop and a second stop coaxial with the valve needle. According to the invention, the valve needle is firmly connected to the guide element. The outer surface of the guide element serves as a guide for the Linearbewegegung of the armature. At the same time, the second stop is an integral part of the guide element. Thus, the guide of the magnet armature is formed integrally with the second stop. The first stop is on the outlet side facing away from the armature and can thus be referred to as the upper stop. The second stop is on the outlet side facing the armature and can thus be referred to as a lower stop. Between the armature and the second stop usually a nip is defined. In this nip there is the medium to be injected, so that the nip attenuates the movement of the armature when closing the injector and quickly restores the armature to its rest position. The effectiveness of the nip depends on the minimum gap height of the nip. In prior art injectors, the second stop is formed on a stop sleeve. The stop sleeve in turn is welded to the valve needle. In this welding, a tilting of the stop sleeve and thus also the second stop against the valve needle, whereby the gap height of the nip is changed unfavorably. This is inventively avoided by that the guide element, on which the second stop is formed, is simultaneously used to guide the magnet armature. As a result, a predetermined angle between the second stop and the guide surface of the armature is fixed and remains unchanged even during the welding process.

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

Das Führungselement ist bevorzugt als eine auf die Ventilnadel aufgesteckte Hülse ausgebildet ist. Alternativ verlängert das Führungselement als massiver Körper die Ventilnadel in Längsrichtung.The guide element is preferably designed as a plugged onto the valve needle sleeve. Alternatively, the guide element extends as a solid body, the valve needle in the longitudinal direction.

Vorzugsweise ist vorgesehen, dass der erste Anschlag an einem Ring ausgebildet. Dieser Ring ist auf das Führungselement aufgesteckt. Insbesondere wird der Ring mit dem Führungselement verschweißt. Der Abstand zwischen den beiden Anschlägen abzüglich der Höhe des Magnetankers definiert den Ankerfreiweg. Dieser wird durch positionieren des Rings auf dem Führungselement eingestellt.It is preferably provided that the first stopper formed on a ring. This ring is attached to the guide element. In particular, the ring is welded to the guide element. The distance between the two stops minus the height of the armature defines the armature free travel. This is set by positioning the ring on the guide element.

Der Ring ist bevorzugt im Querschnitt L-förmig ausgestaltet. Die Verschweißung zwischen Ring und Führungselement erfolgt vorzugsweise auf der auslassabgewandten Seite des ersten Anschlags.The ring is preferably designed in cross-section L-shaped. The welding between the ring and guide element is preferably carried out on the side facing away from the outlet of the first stop.

Das Führungselement wird bevorzugt mit der Ventilnadel verschweißt. Die Schweißnaht wird dabei vorzugsweise lediglich auf der der auslasszugewandten Seite des zweiten Anschlags gesetzt.The guide element is preferably welded to the valve needle. The weld is preferably set only on the side facing the outlet of the second stop.

Des Weiteren ist bevorzugt vorgesehen, dass das Führungselement gemeinsam mit dem zweiten Anschlag als einstückiges Dreh- oder Frästeil gefertigt ist.Furthermore, it is preferably provided that the guide element is made together with the second stop as a one-piece turned or milled part.

Vorzugsweise steht der zweite Anschlag rechtwinklig vom Führungselement ab.Preferably, the second stop is perpendicular from the guide element.

Das Führungselement weist insbesondere eine zylindrische Außenfläche auf, auf der der Magnetanker geführt ist.The guide element has in particular a cylindrical outer surface on which the magnet armature is guided.

Kurze Beschreibung der ZeichnungShort description of the drawing

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

Figur 1
ein erfindungsgemäßes Einspritzventil gemäß allen Ausführungsbeispielen,
Figur 2
ein Detail des erfindungsgemäßen Einspritzventils gemäß einem ersten Ausführungsbeispiel, und
Figur
ein Detail des erfindungsgemäßen Einspritzventils gemäß einem zweiten Ausführungsbeispiel.
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 all embodiments,
FIG. 2
a detail of the injection valve according to the invention according to a first embodiment, and
figure
a detail of the injection valve according to the invention according to a second embodiment.

Ausführungsformen der ErfindungEmbodiments of the invention

Im Folgenden wird anhand der Figuren 1 und 2 ein Einspritzventil 1 nach dem ersten Ausführungsbeispiel im Detail erläutert. Gleiche bzw. funktional gleiche Bauteile sind in allen Ausführungsbeispielen mit denselben Bezugszeichen versehen.The following is based on the FIGS. 1 and 2 an injection valve 1 according to the first embodiment explained in detail. Identical or functionally identical components are provided with the same reference numerals in all embodiments.

Das Einspritzventil 1 umfasst ein Gehäuse 2. Das Gehäuse 2 ist in Figur 1 lediglich teilweise und schematisch dargestellt. An einer Auslassseite 3 des Einspritzventils 1 ist zumindest eine Spritzöffnung 4 im Gehäuse 2 ausgebildet. Des Weiteren trägt das Gehäuse 2 eine Magnetspule 5.The injection valve 1 comprises a housing 2. The housing 2 is in FIG. 1 only partially and schematically shown. At least one injection opening 4 in the housing 2 is formed on an outlet side 3 of the injection valve 1. Furthermore, the housing 2 carries a magnetic coil 5.

Das Einspritzventil 1 umfasst ferner einen Magnetanker 6 und eine Ventilnadel 7 mit einer Kugel 8.The injection valve 1 further comprises a magnet armature 6 and a valve needle 7 with a ball 8.

Der Magnetanker 6 ist entlang einer Längsachse 23 zwischen einem ersten Anschlag 11 und einem zweiten Anschlag 12 linear beweglich. Der Abstand zwischen den beiden Anschlägen 11, 12 definiert einen Ankerfreiweg 13. Eine erste Feder 9 belastet die Ventilnadel 7 in Richtung der Auslassseite 3. Eine zweite Feder 12 ist über einen Federtopf 14 an dem Magnetanker 6 angebunden. Die zweite Feder 10 belastet den Magnetanker 6 über den Federtopf 14 ebenfalls in Richtung der Auslassseite 3, so dass der Magnetanker 6 durch die Kraft der zweiten Feder 10 am zweiten Anschlag 12 anliegt.The magnet armature 6 is linearly movable along a longitudinal axis 23 between a first stop 11 and a second stop 12. The distance between the two stops 11, 12 defines a Ankerfreiweg 13. A first spring 9 loads the valve needle 7 in the direction of the outlet side 3. A second spring 12 is connected via a spring cup 14 to the armature 6. The second spring 10 also loads the magnet armature 6 via the spring cup 14 in the direction of the outlet side 3, so that the armature 6 rests against the second stop 12 by the force of the second spring 10.

Im Magnetanker 6 sind Kanäle 15 ausgebildet. Durch die Kanäle 15 kann der einzuspritzende Brennstoff fließen. Zusätzlich oder alternativ zu den Kanälen 15 kann auch die Ventilnadel 7 als Hohlnadel ausgebildet sein.In the armature 6 channels 15 are formed. Through the channels 15 of the fuel to be injected can flow. Additionally or alternatively to the channels 15 and the valve needle 7 may be formed as a hollow needle.

Figur 2 zeigt einen Detailausschnitt des Einspritzventils 1. Anhand von Figur 2 ist gut zu sehen, dass auf der Ventilnadel 7 ein Führungselement 16, ausgebildet als Hülse 16, steckt. Integraler Bestandteil des Führungselements 16 ist der zweite Anschlag 12. Das Führungselement 16 samt dem zweiten Anschlag 12 ist als ein einstückiges Drehteil gefertigt. Das Führungselement 16 erstreckt sich über eine Führungselementlänge 21. Der Magnetanker 6 erstreckt sich über eine Magnetankerlänge 22. Die Längen werden dabei parallel zur Längsachse 23 gemessen. Die Führungselementlänge 21 ist wesentlich länger als die Magnetankerlänge 22. Dadurch kann das Führungselement 16 mit seiner Außenfläche 18 den Magnetanker 6 vollständig führen. Durch die integrale Ausbildung des zweiten Anschlags 12 am Führungselement 16 ist ein definierter Winkel, insbesondere von 90°, zwischen der Außenfläche 18 und dem zweiten Anschlag 12 gegeben. FIG. 2 shows a detail of the injection valve 1. Based on FIG. 2 It is good to see that on the valve needle 7, a guide element 16, formed as a sleeve 16, inserted. An integral part of the guide member 16 is the second stop 12. The guide member 16 together with the second stop 12 is made as a one-piece rotary member. The guide element 16 extends over a guide element length 21. The magnet armature 6 extends over a magnet armature length 22. The lengths are measured parallel to the longitudinal axis 23. The guide element length 21 is substantially longer than the magnet armature length 22. As a result, the guide element 16 with its outer surface 18 completely guide the magnet armature 6. Due to the integral design of the second stop 12 on the guide element 16, a defined angle, in particular of 90 °, between the outer surface 18 and the second stop 12 is given.

Auf dem Führungselement 16 steckt ein Ring 17. An dem Ring 17 ist der erste Anschlag 11 ausgebildet. Der Ring 17 ist im Querschnitt L-förmig. Der Ring 17 ist über eine erste Schweißnaht 19 mit dem Führungselement 16 verbunden. Das Führungselement 16 wiederum ist mit einer zweiten Schweißnaht 20 mit der Ventilnadel 7 verbunden.On the guide member 16 is a ring 17. At the ring 17, the first stop 11 is formed. The ring 17 is L-shaped in cross section. The ring 17 is connected via a first weld 19 with the guide member 16. The guide element 16 in turn is connected to the valve needle 7 with a second weld 20.

Fig. 3 zeigt ein Detail eines zweiten Ausführungsbeispiels. Im zweiten Ausführungsbeispiel ist das Führungselement 16 nicht als Hülse, sondern als massiver Körper ausgebildet. Die Ventilnadel 7 endet unterhalb des Führungselements 16. Das Führungselement 16 verlängert die Ventilnadel 7 entlang der Längsachse 23 zumindest bis zum Ring 17. Fig. 3 shows a detail of a second embodiment. In the second embodiment, the guide member 16 is not formed as a sleeve, but as a solid body. The valve needle 7 terminates below the guide element 16. The guide element 16 extends the valve needle 7 along the longitudinal axis 23 at least to the ring 17.

Das erfindungsgemäße Führungselement 16 beider Ausführungsbeispiele vereint somit die Führungs- und Anschlagsfunktion. Die Ausführungsbeispiele können mit einer hohlen oder mit einer massiven Ventilnadel 7 gebaut werden, die im allgemeinen nicht symmetrisch sein muss. Der Ring 17 über die erste Schweißnaht 19 mit der Hülse 16 verbunden, wobei hier über verschieben des Rings 17 der gewünschte Ankerfreiweg 13 kostengünstig einstellbar ist.The guide element 16 according to the invention of both embodiments thus combines the guiding and stop function. The embodiments can be constructed with a hollow or with a solid valve needle 7, which generally does not have to be symmetrical. The ring 17 over the first Weld 19 connected to the sleeve 16, in which case the desired Ankerfreiweg 13 is cost-effectively adjustable by moving the ring 17.

Vorzugsweise wird das Führungselement 16 so ausgestaltet, dass die zur Führung dienende Außenfläche 18 und die dazu rechtwinklige Fläche des zweiten Anschlags 12 in einer Aufspannung gefertigt, beispielsweise gedreht und/oder geschliffen, werden können. Die Schweißnähte 19, 20 sind vorzugsweise so weit von der Führungs- und Anschlagsfläche entfernt, dass diese Flächen nicht durch den Schweißprozess verzogen werden.Preferably, the guide member 16 is configured so that the serving for guiding outer surface 18 and the rectangular surface of the second stop 12 made in one setting, for example, rotated and / or ground can be. The welds 19, 20 are preferably so far away from the guide and stop surface that these surfaces are not distorted by the welding process.

Claims (10)

  1. Injection valve (1) for injecting a medium, in particular for injecting fuel into a combustion chamber, comprising:
    - a housing (2) with at least one spray opening (4) on an outlet side (3),
    - a magnet coil (5),
    - a magnet armature (6) which can be moved linearly by way of the magnet coil (5),
    - a linearly movable valve needle (7) for opening and closing the spray opening (4),
    - a first stop (11) on a side of the magnet armature (6) which faces away from the outlet and a second stop (12) on a side of the magnet armature (6) which faces the outlet, the magnet armature (6) being linearly movable between the first stop (11) and the second stop (12) with respect to the valve needle (7), and
    - a guide element (16) which is joined to the valve needle (7), an outer face (18) of the guide element (16) serving as a guide for the linear movement of the magnet armature (6), and the second stop (12) being an integral constituent part of the guide element (16).
  2. Injection valve according to Claim 1, characterized in that the first stop (11) is configured on a ring (17), the ring (17) being plugged onto the guide element (16).
  3. Injection valve according to Claim 2, characterized in that the ring (17) is welded to the guide element (16).
  4. Injection valve according to either of Claims 2 and 3, characterized in that the ring (17) is of L-shaped cross section.
  5. Injection valve according to either of Claims 3 and 4, characterized in that the ring (17) is welded to the guide element (16) merely on that side of the first stop (11) which faces away from the outlet.
  6. Injection valve according to one of the preceding claims, characterized in that the guide element (16) is welded to the valve needle (7).
  7. Injection valve according to Claim 6, characterized in that the guide element (16) is welded to the valve needle (7) merely on that side of the second stop (12) which faces the outlet.
  8. Injection valve according to one of the preceding claims, characterized in that the guide element (16) is manufactured together with the second stop (12) as a single-piece turned or milled part.
  9. Injection valve according to one of the preceding claims, characterized in that the second stop (12) projects from the guide element (16) at a right angle.
  10. Injection valve according to one of the preceding claims, characterized in that the guide element (15) is configured as a sleeve which is plugged onto the valve needle (7), or in that the guide element (15) is configured as an element which extends the valve needle (7).
EP13739435.9A 2012-09-06 2013-07-22 Injection valve Not-in-force EP2893182B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012215779.4A DE102012215779A1 (en) 2012-09-06 2012-09-06 Injector
PCT/EP2013/065372 WO2014037142A1 (en) 2012-09-06 2013-07-22 Injection valve

Publications (2)

Publication Number Publication Date
EP2893182A1 EP2893182A1 (en) 2015-07-15
EP2893182B1 true EP2893182B1 (en) 2016-09-14

Family

ID=48808356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13739435.9A Not-in-force EP2893182B1 (en) 2012-09-06 2013-07-22 Injection valve

Country Status (6)

Country Link
US (1) US9518542B2 (en)
EP (1) EP2893182B1 (en)
JP (1) JP6111334B2 (en)
KR (1) KR102116698B1 (en)
DE (1) DE102012215779A1 (en)
WO (1) WO2014037142A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016042753A1 (en) * 2014-09-17 2016-03-24 株式会社デンソー Fuel injection valve
JP6544416B2 (en) * 2017-12-06 2019-07-17 株式会社デンソー Fuel injection valve
DE102018201951A1 (en) * 2018-02-08 2019-08-08 Robert Bosch Gmbh Valve for metering a fluid

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Publication number Priority date Publication date Assignee Title
DE19849210A1 (en) * 1998-10-26 2000-04-27 Bosch Gmbh Robert Fuel injection valve for internal combustion engine fuel injection system has armature movable between two stops, damping spring arranged between second stop and armature
US6123275A (en) * 1999-08-12 2000-09-26 Delphi Technologies, Inc. Dual gap fuel injector
DE19946602A1 (en) * 1999-09-29 2001-04-12 Bosch Gmbh Robert Fuel injector
DE19957172A1 (en) * 1999-11-27 2001-08-09 Bosch Gmbh Robert Fuel injector
DE10036811A1 (en) * 2000-07-28 2002-02-07 Bosch Gmbh Robert Fuel injector
DE10046304C1 (en) * 2000-09-19 2002-06-06 Bosch Gmbh Robert Method of manufacturing a valve seat body of a fuel injector
DE10108945A1 (en) 2001-02-24 2002-09-05 Bosch Gmbh Robert Fuel injector
DE10140795A1 (en) * 2001-08-20 2003-03-06 Bosch Gmbh Robert Fuel injector
DE102004024533A1 (en) 2004-05-18 2005-12-15 Robert Bosch Gmbh Fuel injector
JP2006017101A (en) 2004-06-02 2006-01-19 Denso Corp Fuel injection valve
KR100562874B1 (en) 2005-01-19 2006-03-23 주식회사 마이크로게이트 Method for assembling z-axis thin-film fluxgate device in a electronic compass
KR100950676B1 (en) 2008-01-07 2010-03-31 에스티에스반도체통신 주식회사 Tri-axis geo-magnetic sensor device and the method for fabricating the same
JP4637930B2 (en) * 2008-05-22 2011-02-23 三菱電機株式会社 Fuel injection valve
JP4637931B2 (en) * 2008-05-22 2011-02-23 三菱電機株式会社 Fuel injection valve
JP4588782B2 (en) * 2008-10-16 2010-12-01 三菱電機株式会社 Fuel injection valve and manufacturing method thereof
WO2013060717A1 (en) 2011-10-26 2013-05-02 Continental Automotive Gmbh Valve assembly for an injection valve and injection valve

Also Published As

Publication number Publication date
JP2015526646A (en) 2015-09-10
US9518542B2 (en) 2016-12-13
KR102116698B1 (en) 2020-06-01
US20150240765A1 (en) 2015-08-27
KR20150048145A (en) 2015-05-06
WO2014037142A1 (en) 2014-03-13
JP6111334B2 (en) 2017-04-05
EP2893182A1 (en) 2015-07-15
DE102012215779A1 (en) 2014-03-06

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