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EP2628941A1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP2628941A1
EP2628941A1 EP13152627.9A EP13152627A EP2628941A1 EP 2628941 A1 EP2628941 A1 EP 2628941A1 EP 13152627 A EP13152627 A EP 13152627A EP 2628941 A1 EP2628941 A1 EP 2628941A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
fuel injection
armature
injection valve
combustion chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13152627.9A
Other languages
German (de)
French (fr)
Other versions
EP2628941B1 (en
Inventor
Michael Kleindl
Cornelia Giessler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2628941A1 publication Critical patent/EP2628941A1/en
Application granted granted Critical
Publication of EP2628941B1 publication Critical patent/EP2628941B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear

Definitions

  • the present invention relates to a fuel injector, in particular for direct injection of fuel into a combustion chamber.
  • valves for direct injection of fuel or fuel are usually moved by means of an actuator against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber.
  • a valve needle is usually moved by means of an actuator against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber.
  • the fuel injection valve according to the invention with the features of claim 1 makes it possible to reduce the wear on the armature and / or the valve needle. This prolongs the life of the fuel injection valve.
  • the sleeves used have only a very small volume and thus a low mass.
  • the mass reduction reduces the impact of closing the fuel injector, which also reduces the tendency to bounce. Due to the large number of closing and opening operations it comes Over the life to a build-up of wear between the valve needle and valve seat. This wear is reduced by the low masses. All of these advantages are achieved by a fuel injection valve, in particular for the direct injection of fuel in a combustion chamber, comprising a housing with at least one combustion chamber-side spray opening. About this at least one injection port, the fuel from the fuel injection valve is introduced into the combustion chamber.
  • the fuel injection valve comprises a linearly movable valve needle, a magnetic coil and a magnetic armature linearly movable by the magnetic coil.
  • the linearly movable valve needle is used to open and close the at least one injection opening.
  • the valve needle comprises a main body extending along the longitudinal axis of the fuel injection valve.
  • a first sleeve is attached on the magnet armature.
  • This first sleeve is made separately from the armature and is firmly attached to the armature.
  • a first, the combustion chamber facing stop surface is formed.
  • a second, facing away from the combustion chamber tee surface is formed.
  • the first stop surface and the second stop surface are arranged so that they strike against each other during the linear movement of the valve needle and / or the armature.
  • the two stop surfaces are thus opposite.
  • the two stop surfaces are formed as annular surfaces. If the magnet armature is moved by means of the magnet coil in the opening direction, and thus to the side of the fuel injection valve facing away from the combustion chamber, then the first abutment surface strikes against the second abutment surface and the armature takes the valve needle in the opening direction.
  • the magnet armature has a continuous recess and the sleeve is arranged on the wall of the recess. Furthermore, the valve needle preferably extends through this recess. In particular, this recess is formed as a round through hole coaxial with the longitudinal axis of the fuel injection valve.
  • the recess has a uniform diameter over its entire length, measured parallel to the longitudinal axis.
  • a simply configured sleeve can be fastened to the wall of the recess.
  • a groove is formed in the wall of the recess.
  • This groove is in particular fully formed circumferentially.
  • the first sleeve is placed in this groove.
  • the first sleeve is in particular designed so that it protrudes beyond the wall of the recess. In particular, this projecting portion of the first sleeve forms the first stop surface.
  • the groove is open on the combustion chamber side facing away from the armature. This ensures that the entire combustion chamber side facing away from the first sleeve can be used as a first stop surface. Furthermore, a simple mounting of the first sleeve in the armature is possible through the laterally open groove.
  • the second stop surface may be formed in a first variant directly on the main body of the valve needle. Alternatively, it is preferably provided to attach a second sleeve to the main body of the valve needle. At this second sleeve, the second stop surface is formed. In particular, the second sleeve is located at a combustion chamber facing away from the end of the main body of the valve needle.
  • the first sleeve and / or the second sleeve are preferably made of a hard material or are coated to form a hardened surface. It is particularly preferably provided that the first sleeve is made of a stronger material than the armature, and / or the second sleeve of a stronger material than the remaining components, in particular the main body of the valve needle.
  • the first sleeve and / or the second sleeve are preferably fastened by means of positive locking and / or frictional engagement and / or material connection on the armature or on the main body of the valve needle.
  • the valve needle can be designed as a hollow needle or as a full needle.
  • FIG. 1 shows the fuel injection valve 1 in a parallel to the longitudinal axis 6 cut representation.
  • the fuel injection valve 1 comprises a housing 2, which comprises at least one injection opening 5 on a combustion chamber-facing side 3. About this injection port 5 fuel is injected into a combustion chamber.
  • the combustion chamber facing side 3 is opposite to a side facing away from the combustion chamber 4.
  • a valve needle 7 is guided linearly movable coaxially to the longitudinal axis 6.
  • This valve needle 7 has a base body 8.
  • This base 8 is hollow inside and has openings 9.
  • a spherical closure body 10 is pressed onto the injection opening 5.
  • the valve needle 7 is moved in the direction of the combustion chamber 4 facing away. Then, the closure body 10 lifts off from the spray opening 5 and fuel can be injected.
  • a magnetic coil 11 and an annular inner pole 12 are arranged in the housing 2.
  • a magnet armature 13 via the magnetic coil 11 of the inner pool 12 is magnetized and thus moves the armature 13 linear to the longitudinal axis 6.
  • a plug connection 14 of the fuel injection valve is shown.
  • FIGS. 2 to 5 Based on FIGS. 2 to 5 four embodiments of the fuel injection valve 1 are shown.
  • the FIGS. 2 to 5 show in each case the marked with II-V detail FIG. 1 , Identical or functionally identical components are provided with the same reference numerals in all embodiments.
  • FIG. 2 shows a detail of the fuel injection valve 1 according to the first embodiment. Shown is the armature 13 with an inner, continuous recess 20. On the wall of the recess 20, a first sleeve 15 is introduced. This first sleeve 15 is fixedly connected to the armature 13. Furthermore, the valve needle 7 is inserted in the recess 20. At the end of the main body 8 of the valve needle 7 facing away from the combustion chamber, a thickening 19 is formed.
  • the first sleeve 15 has on its combustion chamber side facing away from a first stop surface 16. At the thickening 19, a second, combustion chamber facing stop surface 18 is formed. During a movement of the magnet armature 13 and / or the valve needle 7, the two abutment surfaces 16, 18 abut one another.
  • the first sleeve 15 is made of a harder material than the magnet armature 13. As a result, wear on the first stop surface 16 is largely avoided.
  • FIG. 2 a length 21 of the recess 20, measured parallel to the longitudinal axis 6, and a diameter 22 of the recess 20.
  • the outer diameter of the first sleeve 15 corresponds to the diameter 22 of the recess 20.
  • the length of the first sleeve 15 is shorter than the length 21 of the recess 20.
  • An overall length of the first sleeve 15 and the thickening 19, measured parallel to the longitudinal axis 6, corresponds to the length 21 of the recess 20th
  • FIG. 3 shows a detail of the fuel injection valve 1 according to the second embodiment.
  • the armature 13 has a circumferential groove 23 on.
  • the first sleeve 15 is inserted.
  • the first sleeve 15 in this case has in particular a square cross-section.
  • the diameter of the recess 20 on the combustion chamber side of the groove 23 is smaller than the diameter of the recess 20 on the combustion chamber side facing away from the groove 23.
  • the first sleeve 15 projects beyond the wall of the recess 20 and at least a portion of the first sleeve 15 can as a first stop surface 16th be used.
  • FIG. 4 shows a detail of the fuel injection valve 1 according to the third embodiment.
  • the groove 23 is formed at a combustion chamber facing away from the end of the armature 13.
  • the groove 23 is open both toward the combustion chamber side 4 and towards the longitudinal axis 6.
  • This groove 23 allows a relatively simple assembly of the first sleeve 15 and at the same time allows the entire combustion chamber side facing away from the first sleeve 15 is available as the first stop surface 16.
  • FIG. 5 shows a detail of the fuel injection valve 1 according to the fourth embodiment.
  • the first sleeve 15 and the armature 13 are the same as in the first embodiment.
  • a second sleeve 17 fixed to the main body 8 of the valve needle 7 is connected.
  • this second sleeve 17 is made of a hardened material or comprises a hardened surface, so that the wear on the second stop surface 18 is reduced.

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

Abstract

The injector (1) has a linearly movable valve needle (7) e.g. hollow or solid needle, for opening and closing a combustion-chamber side injection aperture (5) of housing (2). A solenoid (11) linearly moves an armature (13). A sleeve is attached to the armature, and made from a solid material than the armature. A stop surface facing away from a combustion chamber is formed on the sleeve. Another stop surface facing the combustion chamber is formed on a valve needle, where the stop surfaces are struck with each other when one of the valve needle and the armature is linearly moved.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Brennstoffeinspritzventil, insbesondere zum direkten Einspritzen von Brennstoff in einen Brennraum.The present invention relates to a fuel injector, in particular for direct injection of fuel into a combustion chamber.

Der Stand der Technik kennt diverse Ventile zum Direkteinspritzen von Brennstoff oder Kraftstoff. Dabei wird in der Regel mittels eines Aktors eine Ventilnadel gegen eine Schließfeder so bewegt, dass eine gewünschte Kraftstoffmenge gezielt direkt in den Brennraum eingebracht wird. Bei schnell schließenden Brennstoffeinspritzventilen kommt es zu einer hohen Dynamik mit den daraus resultierenden Kräften. Diese Kräfte führen in Verbindung mit den weichmagnetischen Werkstoffen bei Magnetanker und Innenpol zu einem hohen Verschleiß. Durch diesen Verschleiß kommt es im Betrieb zu Abweichungen des Ventils bezüglich der Spezifikation. Im Stand der Technik wird teilweise vorgeschlagen, den Magnetanker gegen eine Anschlagplatte zu bewegen. Diese Anschlagplatten haben jedoch einen relativ großen Platzbedarf zur Folge und erhöhen das Gewicht und damit die Prellneigung des Ventils. Weiterhin führen diese erhöhten Massen zu einem vergrößerten Verschleiß an den Komponenten des Ventils.The prior art knows various valves for direct injection of fuel or fuel. In this case, a valve needle is usually moved by means of an actuator against a closing spring so that a desired amount of fuel is introduced directly targeted into the combustion chamber. With fast-closing fuel injection valves, there is a high level of dynamics with the resulting forces. These forces, in conjunction with the magnetically soft materials in the case of magnet armatures and inner pole, lead to high wear. As a result of this wear, deviations of the valve with respect to the specification occur during operation. In the prior art, it is sometimes proposed to move the armature against a stop plate. However, these stop plates have a relatively large footprint result and increase the weight and thus the bounce of the valve. Furthermore, these increased masses lead to increased wear on the components of the valve.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 ermöglicht es, den Verschleiß am Magnetanker und/oder der Ventilnadel zu reduzieren. Dadurch verlängert sich die Lebensdauer des Brennstoffeinspritzventils. Die verwendeten Hülsen weisen nur ein sehr geringes Volumen und somit eine geringe Masse auf. Durch die Massenreduzierung wird der Stoß beim Schließen des Brennstoffeinspritzventils gemindert, wodurch ebenfalls die Neigung zum Prellen reduziert wird. Durch die große Anzahl von Schließ- und Öffnungsvorgängen kommt es über die Lebensdauer zu einer Verschleißbildung zwischen Ventilnadel und Ventilsitz. Auch diese Verschleißbildung wird durch die geringen Massen reduziert. All diese Vorteile werden erreicht durch ein Brennstoffeinspritzventil, insbesondere zum direkten Einspritzen von Brennstoff in einem Brennraum, umfassend ein Gehäuse mit zumindest einer brennraumseitigen Spritzöffnung. Über diese zumindest eine Spritzöffnung wird der Brennstoff aus dem Brennstoffeinspritzventil in den Brennraum eingebracht. Des Weiteren umfasst das Brennstoffeinspritzventil eine linearbewegliche Ventilnadel, eine Magnetspule und einen durch die Magnetspule linear beweglichen Magnetanker. Die linearbewegliche Ventilnadel dient zum Öffnen und Schließen der zumindest einen Spritzöffnung. Insbesondere umfasst die Ventilnadel einen sich entlang der Längsachse des Brennstoffeinspritzventils erstreckenden Grundkörper. An dem Magnetanker ist eine erste Hülse befestigt. Diese erste Hülse ist separat von dem Magnetanker gefertigt und wird fest an dem Magnetanker befestigt. An der ersten Hülse ist eine erste, dem Brennraum zugewandte Anschlagfläche ausgebildet. An der Ventilnadel ist eine zweite, dem Brennraum abgewandte Abschlagfläche ausgebildet. Die erste Anschlagfläche und die zweite Anschlagfläche sind so angeordnet, dass sie bei der Linearbewegung der Ventilnadel und/oder des Magnetankers aneinander anschlagen. Die beiden Anschlagflächen liegen sich somit gegenüber. Insbesondere sind die beiden Anschlagflächen als ringförmige Flächen ausgebildet. Wird der Magnetanker mittels der Magnetspule in Öffnungsrichtung, und somit zur brennraumabgewandten Seite des Brennstoffeinspritzventils bewegt, so schlägt die erste Anschlagfläche an der zweiten Anschlagfläche an und der Magnetanker nimmt die Ventilnadel in Öffnungsrichtung mit.The fuel injection valve according to the invention with the features of claim 1 makes it possible to reduce the wear on the armature and / or the valve needle. This prolongs the life of the fuel injection valve. The sleeves used have only a very small volume and thus a low mass. The mass reduction reduces the impact of closing the fuel injector, which also reduces the tendency to bounce. Due to the large number of closing and opening operations it comes Over the life to a build-up of wear between the valve needle and valve seat. This wear is reduced by the low masses. All of these advantages are achieved by a fuel injection valve, in particular for the direct injection of fuel in a combustion chamber, comprising a housing with at least one combustion chamber-side spray opening. About this at least one injection port, the fuel from the fuel injection valve is introduced into the combustion chamber. Furthermore, the fuel injection valve comprises a linearly movable valve needle, a magnetic coil and a magnetic armature linearly movable by the magnetic coil. The linearly movable valve needle is used to open and close the at least one injection opening. In particular, the valve needle comprises a main body extending along the longitudinal axis of the fuel injection valve. On the magnet armature, a first sleeve is attached. This first sleeve is made separately from the armature and is firmly attached to the armature. On the first sleeve, a first, the combustion chamber facing stop surface is formed. At the valve needle, a second, facing away from the combustion chamber tee surface is formed. The first stop surface and the second stop surface are arranged so that they strike against each other during the linear movement of the valve needle and / or the armature. The two stop surfaces are thus opposite. In particular, the two stop surfaces are formed as annular surfaces. If the magnet armature is moved by means of the magnet coil in the opening direction, and thus to the side of the fuel injection valve facing away from the combustion chamber, then the first abutment surface strikes against the second abutment surface and the armature takes the valve needle in the opening direction.

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

Bevorzugt ist vorgesehen, dass der Magnetanker eine durchgehende Ausnehmung aufweist und die Hülse an der Wandung der Ausnehmung angeordnet ist. Des Weiteren erstreckt sich bevorzugt die Ventilnadel durch diese Ausnehmung hindurch. Insbesondere ist diese Ausnehmung als rundes Durchgangsloch koaxial zur Längsachse des Brennstoffeinspritzventils ausgebildet.It is preferably provided that the magnet armature has a continuous recess and the sleeve is arranged on the wall of the recess. Furthermore, the valve needle preferably extends through this recess. In particular, this recess is formed as a round through hole coaxial with the longitudinal axis of the fuel injection valve.

Des Weiteren ist vorteilhafterweise vorgesehen, dass die Ausnehmung über ihre gesamte Länge, gemessen parallel zur Längsachse, einen einheitlichen Durchmesser aufweist. Dadurch kann eine einfach ausgestaltete Hülse an der Wandung der Ausnehmung befestigt werden.Furthermore, it is advantageously provided that the recess has a uniform diameter over its entire length, measured parallel to the longitudinal axis. As a result, a simply configured sleeve can be fastened to the wall of the recess.

Des Weiteren ist bevorzugt vorgesehen, dass in der Wandung der Ausnehmung eine Nut ausgebildet ist. Diese Nut ist insbesondere voll umfänglich ausgebildet. Die erste Hülse wird in dieser Nut angeordnet. Mittels dieser Nut ist insbesondere ein Formschluss zwischen Hülse und Magnetanker gegeben.Furthermore, it is preferably provided that a groove is formed in the wall of the recess. This groove is in particular fully formed circumferentially. The first sleeve is placed in this groove. By means of this groove in particular a positive connection between the sleeve and magnet armature is given.

Die erste Hülse ist insbesondere so ausgebildet, dass sie über die Wandung der Ausnehmung hervorsteht. Insbesondere dieser hervorstehende Anteil der ersten Hülse bildet die erste Anschlagfläche.The first sleeve is in particular designed so that it protrudes beyond the wall of the recess. In particular, this projecting portion of the first sleeve forms the first stop surface.

Des Weiteren ist bevorzugt vorgesehen, dass die Nut auf der brennraumabgewandten Seite des Magnetankers offen ist. Dadurch wird gewährleistet, dass die gesamte brennraumabgewandte Seite der ersten Hülse als erste Anschlagfläche genutzt werden kann. Des Weiteren ist durch die seitlich offene Nut eine einfache Montage der ersten Hülse im Magnetanker möglich.Furthermore, it is preferably provided that the groove is open on the combustion chamber side facing away from the armature. This ensures that the entire combustion chamber side facing away from the first sleeve can be used as a first stop surface. Furthermore, a simple mounting of the first sleeve in the armature is possible through the laterally open groove.

Die zweite Anschlagfläche kann in einer ersten Variante direkt am Grundkörper der Ventilnadel ausgebildet sein. Alternativ dazu ist es bevorzugt vorgesehen, am Grundkörper der Ventilnadel eine zweite Hülse zu befestigen. An dieser zweiten Hülse ist die zweite Anschlagfläche ausgebildet. Insbesondere befindet sich die zweite Hülse an einem brennraumabgewandten Ende des Grundkörpers der Ventilnadel.The second stop surface may be formed in a first variant directly on the main body of the valve needle. Alternatively, it is preferably provided to attach a second sleeve to the main body of the valve needle. At this second sleeve, the second stop surface is formed. In particular, the second sleeve is located at a combustion chamber facing away from the end of the main body of the valve needle.

Die erste Hülse und/oder die zweite Hülse bestehen bevorzugt aus einem harten Werkstoff oder sind zum Ausbilden einer gehärteten Oberfläche beschichtet. Besonders bevorzugt ist vorgesehen, dass die erste Hülse aus einem festeren Material besteht als der Magnetanker, und/oder die zweite Hülse aus einem festeren Material besteht als die restlichen Bestandteile, insbesondere der Grundkörper der Ventilnadel.The first sleeve and / or the second sleeve are preferably made of a hard material or are coated to form a hardened surface. It is particularly preferably provided that the first sleeve is made of a stronger material than the armature, and / or the second sleeve of a stronger material than the remaining components, in particular the main body of the valve needle.

Die erste Hülse und/oder die zweite Hülse werden bevorzugt mittels Formschluss und/oder Reibschluss und/oder Stoffschluss am Magnetanker bzw. am Grundkörper der Ventilnadel befestigt.The first sleeve and / or the second sleeve are preferably fastened by means of positive locking and / or frictional engagement and / or material connection on the armature or on the main body of the valve needle.

Die Ventilnadel kann als Hohlnadel oder als Vollnadel ausgeführt sein.The valve needle can be designed as a hollow needle or as a full needle.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

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

Figur 1
ein erfindungsgemäßes Brennstoffeinspritzventil gemäß einem ersten bis vierten Ausführungsbeispiel,
Figur 2
ein Detail des erfindungsgemäßen Brennstoffeinspritzventils gemäß dem ersten Ausführungsbeispiel,
Figur 3
ein Detail des erfindungsgemäßen Brennstoffeinspritzventils gemäß dem zweiten Ausführungsbeispiel,
Figur 4
ein Detail des erfindungsgemäßen Brennstoffeinspritzventils gemäß dem dritten Ausführungsbeispiel, und
Figur 5
ein Detail des erfindungsgemäßen Brennstoffeinspritzventils gemäß dem vierten Ausführungsbeispiel.
Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings. Showing:
FIG. 1
an inventive fuel injection valve according to a first to fourth embodiment,
FIG. 2
a detail of the fuel injection valve according to the invention according to the first embodiment,
FIG. 3
a detail of the fuel injection valve according to the invention according to the second embodiment,
FIG. 4
a detail of the fuel injection valve according to the invention according to the third embodiment, and
FIG. 5
a detail of the fuel injection valve according to the invention according to the fourth embodiment.

Ausführungsformen der ErfindungEmbodiments of the invention

Anhand von Figur 1 wird der grundsätzliche Aufbau des Brennstoffeinspritzventils 1 für die nachfolgend beschriebenen vier Ausführungsbeispiele erläutert.Based on FIG. 1 the basic structure of the fuel injection valve 1 is explained for the four embodiments described below.

Figur 1 zeigt das Brennstoffeinspritzventil 1 in einer parallel zur Längsachse 6 geschnittenen Darstellung. Das Brennstoffeinspritzventil 1 umfasst eine Gehäuse 2, das auf einer brennraumzugewandten Seite 3 zumindest eine Spritzöffnung 5 umfasst. Über diese Spritzöffnung 5 wird Brennstoff in eine Brennkammer eingespritzt. Der brennraumzugewandten Seite 3 liegt eine brennraumabgewandte Seite 4 gegenüber. FIG. 1 shows the fuel injection valve 1 in a parallel to the longitudinal axis 6 cut representation. The fuel injection valve 1 comprises a housing 2, which comprises at least one injection opening 5 on a combustion chamber-facing side 3. About this injection port 5 fuel is injected into a combustion chamber. The combustion chamber facing side 3 is opposite to a side facing away from the combustion chamber 4.

In dem Gehäuse 2 ist eine Ventilnadel 7 koaxial zur Längsachse 6 linearbeweglich geführt. Diese Ventilnadel 7 weist einen Grundkörper 8 auf. Dieser Grundkörper 8 ist innen hohl und weist Öffnungen 9 auf. Mittels der Ventilnadel 7 wird ein kugelförmiger Verschlusskörper 10 auf die Spritzöffnung 5 gedrückt. Zum Öffnen des Brennstoffeinspritzventils wird die Ventilnadel 7 in Richtung der brennraumabgewandten Seite 4 bewegt. Daraufhin hebt der Verschlusskörper 10 von der Spritzöffnung 5 ab und Brennstoff kann eingespritzt werden.In the housing 2, a valve needle 7 is guided linearly movable coaxially to the longitudinal axis 6. This valve needle 7 has a base body 8. This base 8 is hollow inside and has openings 9. By means of the valve needle 7, a spherical closure body 10 is pressed onto the injection opening 5. To open the fuel injection valve, the valve needle 7 is moved in the direction of the combustion chamber 4 facing away. Then, the closure body 10 lifts off from the spray opening 5 and fuel can be injected.

Des Weiteren sind im Gehäuse 2 eine Magnetspule 11 und ein ringförmiger Innenpol 12 angeordnet. Auf dem Grundkörper 8 des Ventils 7 steckt ein Magnetanker 13. Über die Magnetspule 11 wird der Innenpool 12 magnetisiert und bewegt somit den Magnetanker 13 linear zur Längsachse 6. Ferner ist in Figur 1 ein Steckeranschluss 14 des Brennstoffeinspritzventils dargestellt.Furthermore, a magnetic coil 11 and an annular inner pole 12 are arranged in the housing 2. On the main body 8 of the valve 7 is a magnet armature 13 via the magnetic coil 11 of the inner pool 12 is magnetized and thus moves the armature 13 linear to the longitudinal axis 6. Further, in FIG. 1 a plug connection 14 of the fuel injection valve is shown.

Anhand der Figuren 2 bis 5 werden vier Ausführungsbeispiele des Brennstoffeinspritzventils 1 gezeigt. Die Figuren 2 bis 5 zeigen dabei jeweils das mit II-V gekennzeichnete Detail aus Figur 1. Gleiche bzw. funktional gleiche Bauteile sind in allen Ausführungsbeispielen mit denselben Bezugszeichen versehen.Based on FIGS. 2 to 5 four embodiments of the fuel injection valve 1 are shown. The FIGS. 2 to 5 show in each case the marked with II-V detail FIG. 1 , Identical or functionally identical components are provided with the same reference numerals in all embodiments.

Figur 2 zeigt ein Detail des Brennstoffeinspritzventils 1 gemäß dem ersten Ausführungsbeispiel. Gezeigt ist der Magnetanker 13 mit einer inneren, durchgehenden Ausnehmung 20. An der Wandung der Ausnehmung 20 ist eine erste Hülse 15 eingebracht. Diese erste Hülse 15 ist fest mit dem Magnetanker 13 verbunden. Des Weiteren steckt in der Ausnehmung 20 die Ventilnadel 7. Am brennraumabgewandten Ende des Grundkörpers 8 der Ventilnadel 7 ist eine Verdickung 19 ausgebildet. FIG. 2 shows a detail of the fuel injection valve 1 according to the first embodiment. Shown is the armature 13 with an inner, continuous recess 20. On the wall of the recess 20, a first sleeve 15 is introduced. This first sleeve 15 is fixedly connected to the armature 13. Furthermore, the valve needle 7 is inserted in the recess 20. At the end of the main body 8 of the valve needle 7 facing away from the combustion chamber, a thickening 19 is formed.

Die erste Hülse 15 weist auf ihrer brennraumabgewandten Seite eine erste Anschlagfläche 16 auf. An der Verdickung 19 ist eine zweite, brennraumzugewandte Anschlagfläche 18 ausgebildet. Bei einer Bewegung des Magnetankers 13 und/oder der Ventilnadel 7 schlagen die beiden Anschlagflächen 16, 18 aneinander an. Die erste Hülse 15 ist aus einem härteren Material gefertigt als der Magnetanker 13. Dadurch wird ein Verschleiß an der ersten Anschlagfläche 16 weitgehend vermieden.The first sleeve 15 has on its combustion chamber side facing away from a first stop surface 16. At the thickening 19, a second, combustion chamber facing stop surface 18 is formed. During a movement of the magnet armature 13 and / or the valve needle 7, the two abutment surfaces 16, 18 abut one another. The first sleeve 15 is made of a harder material than the magnet armature 13. As a result, wear on the first stop surface 16 is largely avoided.

Des Weiteren zeigt Figur 2 eine Länge 21 der Ausnehmung 20, gemessen parallel zur Längsachse 6, und einen Durchmesser 22 der Ausnehmung 20. Der Außendurchmesser der ersten Hülse 15 entspricht dem Durchmesser 22 der Ausnehmung 20. Die Länge der ersten Hülse 15 ist kürzer ausgebildet als die Länge 21 der Ausnehmung 20. Eine Gesamtlänge der ersten Hülse 15 und der Verdickung 19, gemessen parallel zur Längsachse 6, entspricht der Länge 21 der Ausnehmung 20.Further shows FIG. 2 a length 21 of the recess 20, measured parallel to the longitudinal axis 6, and a diameter 22 of the recess 20. The outer diameter of the first sleeve 15 corresponds to the diameter 22 of the recess 20. The length of the first sleeve 15 is shorter than the length 21 of the recess 20. An overall length of the first sleeve 15 and the thickening 19, measured parallel to the longitudinal axis 6, corresponds to the length 21 of the recess 20th

Figur 3 zeigt ein Detail des Brennstoffeinspritzventils 1 gemäß dem zweiten Ausführungsbeispiel. Im zweiten Ausführungsbeispiel weist der Magnetanker 13 eine umlaufende Nut 23 auf. In diese umlaufenden Nut 23 ist die erste Hülse 15 eingesetzt. Die erste Hülse 15 weist hierbei insbesondere einen quadratischen Querschnitt auf. Der Durchmesser der Ausnehmung 20 brennraumseitig der Nut 23 ist kleiner dem Durchmesser der Ausnehmung 20 auf der brennraumabgewandten Seite der Nut 23. Dadurch steht die erste Hülse 15 über die Wandung der Ausnehmung 20 über und zumindest ein Teil der ersten Hülse 15 kann als erste Anschlagfläche 16 genutzt werden. FIG. 3 shows a detail of the fuel injection valve 1 according to the second embodiment. In the second embodiment, the armature 13 has a circumferential groove 23 on. In this circumferential groove 23, the first sleeve 15 is inserted. The first sleeve 15 in this case has in particular a square cross-section. The diameter of the recess 20 on the combustion chamber side of the groove 23 is smaller than the diameter of the recess 20 on the combustion chamber side facing away from the groove 23. Thus, the first sleeve 15 projects beyond the wall of the recess 20 and at least a portion of the first sleeve 15 can as a first stop surface 16th be used.

Figur 4 zeigt ein Detail des Brennstoffeinspritzventils 1 gemäß dem dritten Ausführungsbeispiel. Hier ist die Nut 23 an einem brennraumabgewandten Ende des Magnetankers 13 ausgebildet. Dadurch ist die Nut 23 sowohl zur brennraumabgewandten Seite 4 hin als auch zur Längsachse 6 hin offen. Diese Nut 23 ermöglicht eine relativ einfache Montage der ersten Hülse 15 und ermöglicht gleichzeitig, dass die gesamte brennraumabgewandte Seite der ersten Hülse 15 als erste Anschlagfläche 16 zur Verfügung steht. FIG. 4 shows a detail of the fuel injection valve 1 according to the third embodiment. Here, the groove 23 is formed at a combustion chamber facing away from the end of the armature 13. As a result, the groove 23 is open both toward the combustion chamber side 4 and towards the longitudinal axis 6. This groove 23 allows a relatively simple assembly of the first sleeve 15 and at the same time allows the entire combustion chamber side facing away from the first sleeve 15 is available as the first stop surface 16.

Figur 5 zeigt ein Detail des Brennstoffeinspritzventils 1 gemäß dem vierten Ausführungsbeispiel. Die erste Hülse 15 und der Magnetanker 13 sind genauso wie im ersten Ausführungsbeispiel ausgebildet. Anstatt der Verdickung 19 am Grundkörper 8 der Ventilnadel 7 ist hier eine zweite Hülse 17 fest mit dem Grundkörper 8 der Ventilnadel 7 verbunden. Bevorzugt besteht diese zweite Hülse 17 aus einem gehärteten Material oder umfasst eine gehärtete Oberfläche, sodass auch der Verschleiß an der zweiten Anschlagfläche 18 reduziert wird. Wie in Figur 5 gezeigt wird, beträgt eine Gesamtlänge der ersten Hülse 15 und der zweiten Hülse 17, gemessen parallel zur Längsachse 6, den gleichen Wert wie die Länge 21 der Ausnehmung 20. FIG. 5 shows a detail of the fuel injection valve 1 according to the fourth embodiment. The first sleeve 15 and the armature 13 are the same as in the first embodiment. Instead of the thickening 19 on the main body 8 of the valve needle 7 is here a second sleeve 17 fixed to the main body 8 of the valve needle 7 is connected. Preferably, this second sleeve 17 is made of a hardened material or comprises a hardened surface, so that the wear on the second stop surface 18 is reduced. As in FIG. 5 is shown, an overall length of the first sleeve 15 and the second sleeve 17, measured parallel to the longitudinal axis 6, the same value as the length 21 of the recess 20th

Claims (9)

Brennstoffeinspritzventil (1), insbesondere zum direkten Einspritzen von Brennstoff in einen Brennraum, umfassend: - ein Gehäuse (2) mit zumindest einer brennraumseitigen Spritzöffnung (5), - eine linearbewegliche Ventilnadel (7) zum Öffnen und Schließen der Spritzöffnung (5), - eine Magnetspule (11), - einen durch die Magnetspule (11) linearbeweglichen Magnetanker (13), und - eine erste, am Magnetanker (13) befestigte Hülse (15), - wobei an der ersten Hülse (15) eine erste, brennraumabgewandte Anschlagfläche (16) ausgebildet ist, und an der Ventilnadel (7) eine zweite, brennraumzugewandte Anschlagfläche (18) ausgebildet ist, und - wobei die erste Anschlagfläche (16) und die zweite Anschlagfläche (18) bei der Linearbewegung der Ventilnadel (7) und/oder des Magnetankers (13) aneinander anschlagen. Fuel injection valve (1), in particular for direct injection of fuel into a combustion chamber, comprising: a housing (2) with at least one combustion chamber-side spray opening (5), a linearly movable valve needle (7) for opening and closing the injection opening (5), a magnetic coil (11), - One by the magnetic coil (11) linearly movable armature (13), and a first sleeve (15) fixed to the magnet armature (13), - Wherein on the first sleeve (15), a first combustion chamber facing away from abutment surface (16) is formed, and on the valve needle (7), a second combustion chamber facing stop surface (18) is formed, and - Wherein the first stop surface (16) and the second stop surface (18) abut each other in the linear movement of the valve needle (7) and / or the armature (13). Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Magnetanker (13) eine durchgehende Ausnehmung (20) aufweist und die erste Hülse (15) an der Wandung der Ausnehmung (20) angeordnet ist.Fuel injection valve according to claim 1, characterized in that the magnet armature (13) has a continuous recess (20) and the first sleeve (15) on the wall of the recess (20) is arranged. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass die Ausnehmung (20) über ihre gesamte Länge (21) einen einheitlichen Durchmesser (22) aufweist.Fuel injection valve according to claim 2, characterized in that the recess (20) over its entire length (21) has a uniform diameter (22). Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, dass in der Wandung der Ausnehmung (20) eine Nut (23) ausgebildet ist, wobei die erste Hülse (15) in der Nut (23) angeordnet ist.Fuel injection valve according to claim 2, characterized in that in the wall of the recess (20) has a groove (23) is formed, wherein the first sleeve (15) in the groove (23) is arranged. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet, dass die erste Hülse (15) über die Wandung der Ausnehmung (20) hervorsteht.Fuel injection valve according to claim 4, characterized in that the first sleeve (15) projects beyond the wall of the recess (20). Brennstoffeinspritzventil nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die Nut (23) auf der brennraumabgewandten Seite (4) des Magnetankers (13) offen ist.Fuel injection valve according to one of claims 4 or 5, characterized in that the groove (23) on the side facing away from the combustion chamber (4) of the magnet armature (13) is open. Brennstoffeinspritzventil nach einem der vorhergehenden Ansprüche,
gekennzeichnet durch eine an einem Grundkörper (8) der Ventilnadel (7) befestigte zweite Hülse (17), wobei an der zweiten Hülse (17) die zweite Anschlagsfläche (18) ausgebildet ist.Fuel injection valve according to one of the preceding claims,
characterized by a on a base body (8) of the valve needle (7) fixed second sleeve (17), wherein on the second sleeve (17), the second stop surface (18) is formed. Brennstoffeinspritzventil nach einem der vorhergehende Ansprüche,
dadurch gekennzeichnet, dass die erste Hülse (15) aus einem festeren Material besteht als der Magnetanker (13), und/oder die zweite Hülse (17) aus einem festeren Material besteht als die restlichen Bestandteile der Ventilnadel (7).Fuel injection valve according to one of the preceding claims,
characterized in that the first sleeve (15) is made of a stronger material than the armature (13), and / or the second sleeve (17) is made of a stronger material than the remaining components of the valve needle (7). Brennstoffeinspritzventil nach einem der vorhergehende Ansprüche,
dadurch gekennzeichnet, dass die erste Hülse (15) mittels Formschluss und/oder Reibschluss und/oder Stoffschluss am Magnetanker (11) befestigt ist, und/oder die zweite Hülse (17) mittels Formschluss und/oder Reibschluss und/oder Stoffschluss an der Ventilnadel (7) befestigt istFuel injection valve according to one of the preceding claims,
characterized in that the first sleeve (15) by means of positive locking and / or frictional engagement and / or material connection to the armature (11) is attached, and / or the second sleeve (17) by means of positive locking and / or frictional engagement and / or material connection to the valve needle (7) is attached
EP13152627.9A 2012-02-15 2013-01-25 Fuel injection valve Not-in-force EP2628941B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012202253A DE102012202253A1 (en) 2012-02-15 2012-02-15 Fuel injector

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EP2628941A1 true EP2628941A1 (en) 2013-08-21
EP2628941B1 EP2628941B1 (en) 2014-09-03

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EP (1) EP2628941B1 (en)
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EP2628941B1 (en) 2014-09-03
US10428779B2 (en) 2019-10-01
US20130206872A1 (en) 2013-08-15

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