EP2864623B1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP2864623B1
EP2864623B1 EP13719487.4A EP13719487A EP2864623B1 EP 2864623 B1 EP2864623 B1 EP 2864623B1 EP 13719487 A EP13719487 A EP 13719487A EP 2864623 B1 EP2864623 B1 EP 2864623B1
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EP
European Patent Office
Prior art keywords
armature assembly
valve element
shaped body
cup
injection valve
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.)
Active
Application number
EP13719487.4A
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German (de)
French (fr)
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EP2864623A1 (en
Inventor
Olaf SCHOENROCK
Anselm Berg
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2864623A1 publication Critical patent/EP2864623A1/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to an injection valve, in particular for injecting fuel into a combustion chamber of an internal combustion engine.
  • injection valves with a linearly movable valve needle and a corresponding armature.
  • the magnet armature is moved via a magnetizable solenoid and a pole core.
  • the valve needle is separated from the armature and connected by a spring, so that a two-mass system is formed.
  • the valve needle has a so-called anchor free travel with respect to the armature.
  • the decoupling of armature and valve needle leads to a reduction of the bounce when closing the injector.
  • the injection valve comprises, inter alia, a housing with at least one injection opening, a linearly movable in the housing along a longitudinal axis anchor assembly, a magnetically acting on the armature assembly solenoid and a relation to the armature assembly and with respect to the housing linearly movable valve member for opening and closing the injection port.
  • a pin for limiting the movement of the valve element relative to the armature assembly is provided in an extension of the armature assembly.
  • the injection valve according to the invention with the features of claim 1 shows a novel possibility for connecting the valve element with an armature assembly, wherein further a relative movement between the valve element and the armature assembly is possible, so that a two-mass system is formed.
  • the valve element and the armature assembly are inserted into one another, wherein the relative movement between the armature assembly and the valve element is limited by means of a pin.
  • This arrangement according to the invention also makes possible, in particular, the advantageous embodiment of a damping chamber and / or the arrangement of a compression spring.
  • the inventive design of the injection valve thus reduces the bounce of the valve element, in particular when closing the spray opening.
  • an injection valve comprising a housing with at least one injection opening and an armature assembly movable in the housing along a longitudinal axis.
  • the armature assembly is moved by means of a solenoid energized.
  • a valve element which is linearly movable relative to the armature assembly and relative to the housing is provided in the housing for opening and closing the at least one injection opening.
  • a pin is arranged in order to limit the relative movement between the valve element and the armature assembly.
  • the at least one pin is arranged perpendicular to the longitudinal axis.
  • the pin can either be firmly connected to the armature assembly or fixed to the valve member.
  • the valve element is in the armature assembly.
  • the pin is firmly connected to the armature assembly and extends a recess, in particular a bore transverse to the longitudinal axis, in the valve element. This recess in the valve element is greater in the direction of the longitudinal axis than the diameter of the pin, so that to a limited extent the valve element can be moved relative to the armature assembly.
  • a damping space for damping the movement of the valve element is formed. This damping chamber fills when using the injector with the fluid to be injected.
  • the armature assembly comprises a cup-shaped body.
  • the cup-shaped body is formed by a bottom which is perpendicular to the longitudinal axis and a circumferential side wall.
  • the cup-shaped body opens to the combustion chamber facing side or to the injection opening.
  • the valve element is guided linearly movable in the cup-shaped body. Between the bottom of the cup-shaped body and the valve element in particular the damping space is formed.
  • At least one outflow bore for the fluid to be injected is preferably provided in the bottom of the cup-shaped body.
  • a compression spring is preferably arranged, which is supported with one end against the armature assembly and with the other end against the valve element. This compression spring presses the valve element in the closing direction.
  • the compression spring between the valve element and the bottom of the cup-shaped body is arranged.
  • the armature assembly preferably has a hollow needle as a central component. Through this hollow needle, the fluid to be injected flows. At least one flow-through opening for the fluid is particularly preferably provided on the hollow needle. At a combustion chamber remote from the end of the hollow needle, a magnet armature is mounted, which cooperates magnetically with an inner pole or with the magnetic coil. At the other end of the hollow needle of the cup-shaped body is used and in particular cohesively, for example by means of a welded connection, connected to the hollow needle.
  • a shoulder is provided in the cup-shaped body. This paragraph represents a surface facing the combustion chamber. This surface facing the combustion chamber faces a surface of the valve element facing away from the combustion chamber. Between these two surfaces thus a squish gap is formed. When moving the armature assembly to the Valve element reduces this nip. By appropriate dimensioning of the nip the damping effect is adjustable.
  • the pot-shaped body is manufactured in particular as a deep-drawn part. Alternatively, e.g. a production provided as a turned part.
  • the valve element preferably comprises a small valve needle, which is fixedly connected to a sealing element, in particular a ball.
  • FIG. 1 shows, in half section and schematically simplified, an injection valve 1 according to the first embodiment.
  • the injection valve 1 comprises a housing 2, which is shown only schematically, with at least one injection opening 3.
  • the side of the injection valve 1 with the injection opening 3 is referred to as the combustion chamber-facing side 4.
  • the other side of the injection valve 1 is referred to as side facing away from combustion chamber 5.
  • the injection valve 1 extends along a longitudinal axis 6.
  • a valve element 7 is arranged to be linearly movable within the housing 2.
  • the valve element 7 comprises a short valve needle 8, which is fixedly connected to a valve ball 9.
  • a recess 10 formed as a bore perpendicular to the longitudinal axis 6, is arranged.
  • the armature assembly 11 is movable by means of the magnetic coil 26. Furthermore, the armature assembly 11 is loaded by means of a closing pressure spring 12 in the closing direction or toward the side 4 facing the combustion chamber.
  • the armature assembly 11 comprises a hollow needle 13 with at least one flow opening 14 for the fuel.
  • a magnet armature 15 is mounted on the hollow needle 13.
  • the cup-shaped body 16 is fixedly connected to the hollow needle 13, in particular welded.
  • the cup-shaped body 16 comprises a bottom 17, which is perpendicular to the longitudinal axis 6.
  • a cylindrical side wall 18 of the cup-shaped body 16 connects.
  • the cup-shaped body 16 opens to the side facing the combustion chamber 4.
  • the valve element 7, in particular the short valve needle stuck 8. Fixed to the side wall 18, a pin 19 is connected.
  • the pin 19 extends perpendicular to the longitudinal axis 6 in the recess 10 in the short valve needle 8. By means of this pin 19, a movement of the valve member 7 relative to the cup-shaped body 16 is limited.
  • a compression spring 20 is arranged between the bottom 17 of the cup-shaped body 16 and a combustion chamber side facing away from the valve element 7. Furthermore, the space between the combustion chamber side facing away from the valve element 7 and the bottom 17 serves as a damping chamber 21 for the opening movement of the valve element 7. To adjust the corresponding damping effect, at least one outflow bore 22 in the bottom 17 is provided. The discharge bore 22 is dimensioned according to the desired damping effect.
  • the short valve needle 8 is guided along a guide 23 on the side wall 18.
  • FIG. 2 shows a detail of the injection valve 1 according to the second embodiment. Identical or functionally identical components are provided with the same reference numerals in all embodiments.
  • the cup-shaped body comprises a shoulder 24 on its side wall 18 in the second exemplary embodiment.
  • the shoulder 24 forms an annular area facing the combustion chamber. Between this annular surface and the combustion chamber facing away from the surface of the valve needle 8, a nip 25 is formed. Also via this nip 25, the damping effect of the damping chamber 21 can be regulated.
  • the armature assembly 11 In the de-energized state of the solenoid coil 26, the armature assembly 11 is pressed against the compression spring 20 by means of the closing pressure spring 12 against the valve element 7, so that the valve ball 9, the injection port 3 seals. After the start of the energization, as soon as the magnetic force is greater than the force of the closing compression spring 12 minus the force of the compression spring 20, the armature assembly 11 in the opening direction, in particular in the direction of an inner pole, not shown, accelerated until the pin 16 on a wall of the recess 10 abuts in the valve needle 8 and the pulse is transmitted to the valve element 7.
  • the following functional sequence results: As soon as the valve ball 9 touches the sealing seat, the armature assembly 11 can move further in the closing direction. In this case, the armature assembly 11 is braked by the compression spring 20. In addition, a pressure builds up between the valve element 7 and the bottom 17 of the pot-shaped body 16, that is to say in the damping space 21, which pressure is reduced via the nip 25 and / or the discharge bore 22. The diameter of the outflow bore 22 and the size of the nip 25 and the dimensioning of the entire damping chamber 21 define the damping experienced by the valve needle 7 and the armature assembly 11.

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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, insbesondere zum Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine. Bekannt sind Einspritzventile mit einer linear beweglichen Ventilnadel und einem entsprechenden Magnetanker. Der Magnetanker wird dabei über eine bestrombare Magnetspule und einen Polkern bewegt. Oftmals wird die Ventilnadel vom Magnetanker getrennt und über eine Feder verbunden, so dass ein Zweimassensystem entsteht. Dadurch hat die Ventilnadel gegenüber dem Magnetanker einen sogenannten Ankerfreiweg. Die Entkopplung von Magnetanker und Ventilnadel führt zu einer Reduktion des Prellens beim Schließen des Einspritzventils.The present invention relates to an injection valve, in particular for injecting fuel into a combustion chamber of an internal combustion engine. Are known injection valves with a linearly movable valve needle and a corresponding armature. The magnet armature is moved via a magnetizable solenoid and a pole core. Often the valve needle is separated from the armature and connected by a spring, so that a two-mass system is formed. As a result, the valve needle has a so-called anchor free travel with respect to the armature. The decoupling of armature and valve needle leads to a reduction of the bounce when closing the injector.

Aus der WO 02/053906 A1 ist bereits ein Einspritzventil, insbesondere zum Einspritzen von Brennstoff in einen Brennraum, bekannt. Das Einspritzventil umfasst u.a. ein Gehäuse mit zumindest einer Spritzöffnung, eine im Gehäuse entlang einer Längsachse linearbewegliche Ankerbaugruppe, eine magnetisch auf die Ankerbaugruppe wirkende Magnetspule sowie ein gegenüber der Ankerbaugruppe und gegenüber dem Gehäuse linearbewegliches Ventilelement zum Öffnen und Schließen der Spritzöffnung. Außerdem ist in einer Verlängerung der Ankerbaugruppe ein Stift zur Begrenzung der Bewegung des Ventilelementes gegenüber der Ankerbaugruppe vorgesehen.From the WO 02/053906 A1 is already an injection valve, in particular for injecting fuel into a combustion chamber, known. The injection valve comprises, inter alia, a housing with at least one injection opening, a linearly movable in the housing along a longitudinal axis anchor assembly, a magnetically acting on the armature assembly solenoid and a relation to the armature assembly and with respect to the housing linearly movable valve member for opening and closing the injection port. In addition, a pin for limiting the movement of the valve element relative to the armature assembly is provided in an extension of the armature assembly.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Einspritzventil mit den Merkmalen des Anspruchs 1 zeigt eine neuartige Möglichkeit zur Verbindung des Ventilelementes mit einer Ankerbaugruppe, wobei weiterhin eine Relativbewegung zwischen dem Ventilelement und der Ankerbaugruppe möglich ist, so dass ein Zweimassensystem entsteht. Erfindungsgemäß stecken das Ventilelement und die Ankerbaugruppe ineinander, wobei die Relativbewegung zwischen der Ankerbaugruppe und dem Ventilelement mittels eines Stiftes begrenzt wird. Diese erfindungsgemäße Anordnung ermöglicht insbesondere auch die vorteilhafte Ausbildung eines Dämpfungsraumes und/oder die Anordnung einer Druckfeder. Durch die erfindungsgemäße Ausbildung des Einspritzventils reduziert sich somit das Prellverhalten des Ventilelementes insbesondere beim Schließen der Spritzöffnung. Diese Vorteile werden erreicht durch ein Einspritzventil, umfassend ein Gehäuse mit zumindest einer Spritzöffnung und eine im Gehäuse entlang einer Längsachse bewegliche Ankerbaugruppe. Die Ankerbaugruppe wird mittels einer bestromten Magnetspule bewegt. Des Weiteren ist im Gehäuse ein gegenüber der Ankerbaugruppe und gegenüber dem Gehäuse linear bewegliches Ventilelement zum Öffnen und Schließen der zumindest einen Spritzöffnung vorgesehen. Um die Relativbewegung zwischen Ventilelement und der Ankerbaugruppe zu begrenzen, wird ein Stift angeordnet.The injection valve according to the invention with the features of claim 1 shows a novel possibility for connecting the valve element with an armature assembly, wherein further a relative movement between the valve element and the armature assembly is possible, so that a two-mass system is formed. According to the invention, the valve element and the armature assembly are inserted into one another, wherein the relative movement between the armature assembly and the valve element is limited by means of a pin. This arrangement according to the invention also makes possible, in particular, the advantageous embodiment of a damping chamber and / or the arrangement of a compression spring. The inventive design of the injection valve thus reduces the bounce of the valve element, in particular when closing the spray opening. These advantages are achieved by an injection valve, comprising a housing with at least one injection opening and an armature assembly movable in the housing along a longitudinal axis. The armature assembly is moved by means of a solenoid energized. Furthermore, a valve element which is linearly movable relative to the armature assembly and relative to the housing is provided in the housing for opening and closing the at least one injection opening. In order to limit the relative movement between the valve element and the armature assembly, a pin is arranged.

Es ist vorgesehen, dass der zumindest eine Stift senkrecht zur Längsachse angeordnet wird. Der Stift kann entweder fest mit der Ankerbaugruppe oder fest mit dem Ventilelement verbunden werden. In bevorzugter Ausführung steckt das Ventilelement in der Ankerbaugruppe. Der Stift wird fest mit der Ankerbaugruppe verbunden und erstreckt sich eine Ausnehmung, insbesondere eine Bohrung quer zur Längsachse, im Ventilelement. Diese Ausnehmung im Ventilelement ist in Richtung der Längsachse größer als der Durchmesser des Stiftes, so dass in begrenztem Umfang das Ventilelement gegenüber der Ankerbaugruppe bewegt werden kann.It is provided that the at least one pin is arranged perpendicular to the longitudinal axis. The pin can either be firmly connected to the armature assembly or fixed to the valve member. In a preferred embodiment, the valve element is in the armature assembly. The pin is firmly connected to the armature assembly and extends a recess, in particular a bore transverse to the longitudinal axis, in the valve element. This recess in the valve element is greater in the direction of the longitudinal axis than the diameter of the pin, so that to a limited extent the valve element can be moved relative to the armature assembly.

Innerhalb der Ankerbaugruppe wird ein Dämpfungsraum zum Dämpfen der Bewegung des Ventilelementes ausgebildet. Dieser Dämpfungsraum füllt sich bei Benutzung des Einspritzventils mit dem einzuspritzenden Fluid.Within the armature assembly, a damping space for damping the movement of the valve element is formed. This damping chamber fills when using the injector with the fluid to be injected.

Erfindungsgemäß umfasst die Ankerbaugruppe einen topfförmigen Körper. Der topfförmige Körper wird gebildet durch einen Boden, der senkrecht zur Längsachse steht und eine umlaufende Seitenwandung. Der topfförmige Körper öffnet sich zur brennraumzugewandten Seite bzw. zur Spritzöffnung hin. In diesem topfförmigen Körper steckt das Ventilelement. Das Ventilelement ist in dem topfförmigen Körper linear beweglich geführt. Zwischen dem Boden des topfförmigen Körpers und dem Ventilelement ist insbesondere der Dämpfungsraum ausgebildet.According to the invention, the armature assembly comprises a cup-shaped body. The cup-shaped body is formed by a bottom which is perpendicular to the longitudinal axis and a circumferential side wall. The cup-shaped body opens to the combustion chamber facing side or to the injection opening. In this cup-shaped body is the valve element. The valve element is guided linearly movable in the cup-shaped body. Between the bottom of the cup-shaped body and the valve element in particular the damping space is formed.

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

Zur Einstellung der Dämpfungswirkung ist bevorzugt im Boden des topfförmigen Körpers zumindest eine Abströmbohrung für das einzuspritzende Fluid vorgesehen.To adjust the damping effect, at least one outflow bore for the fluid to be injected is preferably provided in the bottom of the cup-shaped body.

Des Weiteren wird bevorzugt eine Druckfeder angeordnet, die sich mit einem Ende gegen die Ankerbaugruppe und mit dem anderen Ende gegen das Ventilelement stützt. Diese Druckfeder drückt das Ventilelement in Schließrichtung. Besonders bevorzugt ist die Druckfeder zwischen dem Ventilelement und dem Boden des topfförmigen Körpers angeordnet.Furthermore, a compression spring is preferably arranged, which is supported with one end against the armature assembly and with the other end against the valve element. This compression spring presses the valve element in the closing direction. Particularly preferably, the compression spring between the valve element and the bottom of the cup-shaped body is arranged.

Die Ankerbaugruppe weist bevorzugt als zentrales Bauteil eine Hohlnadel auf. Durch diese Hohlnadel strömt das einzuspritzende Fluid. Besonders bevorzugt ist an der Hohlnadel zumindest eine Durchströmöffnung für das Fluid vorgesehen. An einem brennraumabgewandten Ende der Hohlnadel ist ein Magnetanker montiert, der mit einem Innenpol bzw. mit der Magnetspule magnetisch zusammenwirkt. An dem anderen Ende der Hohlnadel ist der topfförmige Körper eingesetzt und insbesondere stoffschlüssig, beispielsweise mittels einer Schweißverbindung, mit der Hohlnadel verbunden.The armature assembly preferably has a hollow needle as a central component. Through this hollow needle, the fluid to be injected flows. At least one flow-through opening for the fluid is particularly preferably provided on the hollow needle. At a combustion chamber remote from the end of the hollow needle, a magnet armature is mounted, which cooperates magnetically with an inner pole or with the magnetic coil. At the other end of the hollow needle of the cup-shaped body is used and in particular cohesively, for example by means of a welded connection, connected to the hollow needle.

In einer weiter bevorzugten Ausführungsform ist ein Absatz im topfförmigen Körper vorgesehen. Dieser Absatz stellt eine brennraumzugewandte Fläche dar. Dieser brennraumzugewandten Fläche steht eine brennraumabgewandte Fläche des Ventilelementes gegenüber. Zwischen diesen beiden Flächen ist somit ein Quetschspalt ausgebildet. Beim Bewegen der Ankerbaugruppe auf das Ventilelement verringert sich dieser Quetschspalt. Durch eine entsprechende Dimensionierung des Quetschspaltes ist die Dämpfungswirkung einstellbar.In a further preferred embodiment, a shoulder is provided in the cup-shaped body. This paragraph represents a surface facing the combustion chamber. This surface facing the combustion chamber faces a surface of the valve element facing away from the combustion chamber. Between these two surfaces thus a squish gap is formed. When moving the armature assembly to the Valve element reduces this nip. By appropriate dimensioning of the nip the damping effect is adjustable.

Der topfförmige Körper wird insbesondere als Tiefziehteil gefertigt. Alternativ ist z.B. eine Fertigung als Drehteil vorgesehen.The pot-shaped body is manufactured in particular as a deep-drawn part. Alternatively, e.g. a production provided as a turned part.

Das Ventilelement umfasst bevorzugt eine kleine Ventilnadel, die mit einem Dichtelement, insbesondere einer Kugel, fest verbunden ist.The valve element preferably comprises a small valve needle, which is fixedly connected to a sealing element, in particular a ball.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

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

Figur 1
einen Halbschnitt eines erfindungsgemäßen Einspritzventils gemäß einem ersten Ausführungsbeispiel, und
Figur 2
ein Detail im Halbschnitt 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
a half-section of an injection valve according to the invention according to a first embodiment, and
FIG. 2
a detail in half section of the injection valve according to the invention according to a second embodiment.

Ausführungsformen der ErfindungEmbodiments of the invention

Figur 1 zeigt, im Halbschnitt und schematisch vereinfacht, ein Einspritzventil 1 gemäß dem ersten Ausführungsbeispiel. FIG. 1 shows, in half section and schematically simplified, an injection valve 1 according to the first embodiment.

Das Einspritzventil 1 umfasst ein lediglich schematisch dargestelltes Gehäuse 2 mit zumindest einer Spritzöffnung 3. Die Seite des Einspritzventils 1 mit der Spritzöffnung 3 wird als brennraumzugewandte Seite 4 bezeichnet. Die andere Seite des Einspritzventils 1 wird als brennraumabgewandte Seite 5 bezeichnet. Das Einspritzventil 1 erstreckt sich entlang einer Längsachse 6. Entlang dieser Längsachse 6 ist ein Ventilelement 7 innerhalb des Gehäuses 2 linear beweglich angeordnet. Das Ventilelement 7 umfasst eine kurze Ventilnadel 8, die fest verbunden ist mit einer Ventilkugel 9. In der Ventilnadel 8 ist eine Ausnehmung 10, ausgebildet als Bohrung senkrecht zur Längsachse 6, angeordnet.The injection valve 1 comprises a housing 2, which is shown only schematically, with at least one injection opening 3. The side of the injection valve 1 with the injection opening 3 is referred to as the combustion chamber-facing side 4. The other side of the injection valve 1 is referred to as side facing away from combustion chamber 5. The injection valve 1 extends along a longitudinal axis 6. Along this longitudinal axis 6, a valve element 7 is arranged to be linearly movable within the housing 2. The valve element 7 comprises a short valve needle 8, which is fixedly connected to a valve ball 9. In the valve needle 8, a recess 10, formed as a bore perpendicular to the longitudinal axis 6, is arranged.

Am Gehäuse 2 ist eine bestrombare Magnetspule 26 montiert.On the housing 2 a bestrombare solenoid 26 is mounted.

Des Weiteren befindet sich im Gehäuse 2 eine entlang der Längsachse 6 linear bewegliche Ankerbaugruppe 11. Die Ankerbaugruppe 11 ist mittels der Magnetspule 26 beweglich. Des Weiteren wird die Ankerbaugruppe 11 mittels einer Schließdruckfeder 12 in Schließrichtung bzw. zur brennraumzugewandten Seite 4 hin belastet. Die Ankerbaugruppe 11 umfasst eine Hohlnadel 13 mit zumindest einer Durchströmöffnung 14 für den Brennstoff. Auf der brennraumabgewandten Seite 5 ist ein Magnetanker 15 auf der Hohlnadel 13 befestigt. An der brennraumzugewandten Seite 4 steckt ein topfförmiger Körper 16 in der Hohlnadel 13.Furthermore, located in the housing 2 along the longitudinal axis 6 linearly movable armature assembly 11. The armature assembly 11 is movable by means of the magnetic coil 26. Furthermore, the armature assembly 11 is loaded by means of a closing pressure spring 12 in the closing direction or toward the side 4 facing the combustion chamber. The armature assembly 11 comprises a hollow needle 13 with at least one flow opening 14 for the fuel. On the side facing away from the combustion chamber 5, a magnet armature 15 is mounted on the hollow needle 13. On the side facing the combustion chamber 4 is a pot-shaped body 16 in the hollow needle thirteenth

Der topfförmige Körper 16 ist mit der Hohlnadel 13 fest verbunden, insbesondere verschweißt. Der topfförmige Körper 16 umfasst einen Boden 17, der senkrecht zur Längsachse 6 steht. An den Boden 17 schließt sich eine zylindrische Seitenwand 18 des topfförmigen Körpers 16 an.The cup-shaped body 16 is fixedly connected to the hollow needle 13, in particular welded. The cup-shaped body 16 comprises a bottom 17, which is perpendicular to the longitudinal axis 6. At the bottom 17, a cylindrical side wall 18 of the cup-shaped body 16 connects.

Der topfförmige Körper 16 öffnet sich zur brennraumzugewandten Seite 4 hin. In dem topfförmigen Körper 16 steckt das Ventilelement 7, insbesondere die kurze Ventilnadel 8. Fest mit der Seitenwand 18 ist ein Stift 19 verbunden. Der Stift 19 erstreckt sich senkrecht zur Längsachse 6 in die Ausnehmung 10 in der kurzen Ventilnadel 8. Mittels dieses Stiftes 19 wird eine Bewegung des Ventilelementes 7 gegenüber dem topfförmigen Körper 16 begrenzt.The cup-shaped body 16 opens to the side facing the combustion chamber 4. In the cup-shaped body 16, the valve element 7, in particular the short valve needle stuck 8. Fixed to the side wall 18, a pin 19 is connected. The pin 19 extends perpendicular to the longitudinal axis 6 in the recess 10 in the short valve needle 8. By means of this pin 19, a movement of the valve member 7 relative to the cup-shaped body 16 is limited.

Zwischen dem Boden 17 des topfförmigen Körpers 16 und einer brennraumabgewandten Seite des Ventilelementes 7 ist eine Druckfeder 20 angeordnet. Des Weiteren dient der Raum zwischen der brennraumabgewandten Seite des Ventilelementes 7 und dem Boden 17 als Dämpfungsraum 21 für die Öffnungsbewegung des Ventilelementes 7. Um die entsprechende Dämpfungswirkung einzustellen, ist zumindest eine Abströmbohrung 22 im Boden 17 vorgesehen. Die Abströmbohrung 22 wird entsprechend der gewünschten Dämpfungswirkung dimensioniert.Between the bottom 17 of the cup-shaped body 16 and a combustion chamber side facing away from the valve element 7, a compression spring 20 is arranged. Furthermore, the space between the combustion chamber side facing away from the valve element 7 and the bottom 17 serves as a damping chamber 21 for the opening movement of the valve element 7. To adjust the corresponding damping effect, at least one outflow bore 22 in the bottom 17 is provided. The discharge bore 22 is dimensioned according to the desired damping effect.

Die kurze Ventilnadel 8 ist entlang einer Führung 23 an der Seitenwand 18 geführt.The short valve needle 8 is guided along a guide 23 on the side wall 18.

Figur 2 zeigt einen Detailausschnitt des Einspritzventils 1 gemäß dem zweiten Ausführungsbeispiel. Gleiche bzw. funktional gleiche Bauteile sind in allen Ausführungsbeispielen mit denselben Bezugszeichen versehen. FIG. 2 shows a detail of the injection valve 1 according to the second embodiment. Identical or functionally identical components are provided with the same reference numerals in all embodiments.

Im Unterschied zum ersten Ausführungsbeispiel umfasst der topfförmige Körper an seiner Seitenwand 18 im zweiten Ausführungsbeispiel einen Absatz 24. Der Absatz 24 bildet eine ringförmige, brennraumzugewandte Fläche. Zwischen dieser ringförmigen Fläche und der brennraumabgewandten Fläche der Ventilnadel 8 ist ein Quetschspalt 25 ausgebildet. Auch über diesen Quetschspalt 25 kann die Dämpfungswirkung des Dämpfungsraums 21 reguliert werden.In contrast to the first exemplary embodiment, the cup-shaped body comprises a shoulder 24 on its side wall 18 in the second exemplary embodiment. The shoulder 24 forms an annular area facing the combustion chamber. Between this annular surface and the combustion chamber facing away from the surface of the valve needle 8, a nip 25 is formed. Also via this nip 25, the damping effect of the damping chamber 21 can be regulated.

Im zweiten Ausführungsbeispiel kann sowohl mittels des Quetschspaltes 25 als auch mittels der Dimensionierung des Dämpfungsraums 21 mit der Abströmbohrung 22 die Dämpfungswirkung eingestellt werden.In the second embodiment, both by means of the nip 25 and by means of the dimensioning of the damping chamber 21 with the discharge bore 22, the damping effect can be adjusted.

Im unbestromten Zustand der Magnetspule 26 wird die Ankerbaugruppe 11 mittels der Schließdruckfeder 12 entgegen der Druckfeder 20 auf das Ventilelement 7 gedrückt, so dass die Ventilkugel 9 die Spritzöffnung 3 abdichtet. Nach dem Beginn der Bestromung, sobald also die Magnetkraft größer der Kraft der Schließdruckfeder 12 abzüglich der Kraft der Druckfeder 20 ist, wird die Ankerbaugruppe 11 in Öffnungsrichtung, insbesondere in Richtung eines nicht dargestellten Innenpols, beschleunigt, bis der Stift 16 an einer Wandung der Ausnehmung 10 in der Ventilnadel 8 anschlägt und der Impuls auf das Ventilelement 7 übertragen wird.In the de-energized state of the solenoid coil 26, the armature assembly 11 is pressed against the compression spring 20 by means of the closing pressure spring 12 against the valve element 7, so that the valve ball 9, the injection port 3 seals. After the start of the energization, as soon as the magnetic force is greater than the force of the closing compression spring 12 minus the force of the compression spring 20, the armature assembly 11 in the opening direction, in particular in the direction of an inner pole, not shown, accelerated until the pin 16 on a wall of the recess 10 abuts in the valve needle 8 and the pulse is transmitted to the valve element 7.

Beim Schließen ergibt sich folgender Funktionsablauf: Sobald die Ventilkugel 9 den Dichtsitz berührt, kann die Ankerbaugruppe 11 sich weiter in Schließrichtung bewegen. Dabei wird die Ankerbaugruppe 11 durch die Druckfeder 20 abgebremst. Darüber hinaus baut sich zwischen dem Ventilelement 7 und dem Boden 17 des topfförmigen Körpers 16, also im Dämpfungsraum 21, ein Druck auf, der über den Quetschspalt 25 und/oder die Abströmbohrung 22 abgebaut wird. Der Durchmesser der Abströmbohrung 22 und die Größe des Quetschspaltes 25 sowie die Dimensionierung des gesamten Dämpfungsraums 21 definieren dabei die Dämpfung, die die Ventilnadel 7 und die Ankerbaugruppe 11 erfahren.When closing, the following functional sequence results: As soon as the valve ball 9 touches the sealing seat, the armature assembly 11 can move further in the closing direction. In this case, the armature assembly 11 is braked by the compression spring 20. In addition, a pressure builds up between the valve element 7 and the bottom 17 of the pot-shaped body 16, that is to say in the damping space 21, which pressure is reduced via the nip 25 and / or the discharge bore 22. The diameter of the outflow bore 22 and the size of the nip 25 and the dimensioning of the entire damping chamber 21 define the damping experienced by the valve needle 7 and the armature assembly 11.

Claims (7)

  1. Injection valve (1), in particular for injecting fuel into a combustion chamber, comprising
    a housing (2) with at least one spray opening (3),
    an armature assembly (11) which is movable linearly in the housing (2) along a longitudinal axis (11),
    a magnet coil (26) acting magnetically on the armature assembly (11),
    a valve element (7) which is movable linearly in relation to the armature assembly (11) and in relation to the housing (2) for opening and closing the spray opening (3), and
    a pin (19) extending perpendicularly to the longitudinal axis (6) for limiting the movement of the valve element (7) in relation to the armature assembly (11),
    characterized in that a damping chamber (21) which is fillable with fuel is provided in the armature assembly (11) for damping a movement of the armature assembly (11) with respect to the valve element (7), wherein the armature assembly (11) comprises a cup-shaped body (16) in which the valve element (7) is inserted and in which the damping chamber (21) is formed.
  2. Injection valve according to Claim 1, characterized in that the pin (19) is either connected fixedly to the armature assembly (11) or connected fixedly to the valve element (7).
  3. Injection valve according to Claims 1 or 2, characterized by a compression spring (20) between the armature assembly (11) and the valve element (7), said compression spring pressing the valve element (7) in the closing direction.
  4. Injection valve according to Claim 1 and 3, characterized in that the compression spring (20) is arranged in the cup-shaped body (16).
  5. Injection valve according to one of the preceding claims, characterized by at least one outflow opening (22) in a base (17) of the cup-shaped body (16).
  6. Injection valve according to one of the preceding claims, characterized in that the armature assembly (11) comprises a hollow needle (13), wherein a magnet armature (15) and the cup-shaped body (16) are mounted on the hollow needle (13).
  7. Injection valve according to one of the preceding claims, characterized by a shoulder (24) in the cup-shaped body (16) for forming a pinch gap (25) between the shoulder (24) and the valve element (7).
EP13719487.4A 2012-06-20 2013-04-24 Injection valve Active EP2864623B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012210424A DE102012210424A1 (en) 2012-06-20 2012-06-20 Injector
PCT/EP2013/058488 WO2013189639A1 (en) 2012-06-20 2013-04-24 Injection valve

Publications (2)

Publication Number Publication Date
EP2864623A1 EP2864623A1 (en) 2015-04-29
EP2864623B1 true EP2864623B1 (en) 2019-06-19

Family

ID=48227236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13719487.4A Active EP2864623B1 (en) 2012-06-20 2013-04-24 Injection valve

Country Status (5)

Country Link
US (1) US9394869B2 (en)
EP (1) EP2864623B1 (en)
JP (1) JP6028095B2 (en)
DE (1) DE102012210424A1 (en)
WO (1) WO2013189639A1 (en)

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Publication number Priority date Publication date Assignee Title
EP2947306A1 (en) * 2014-05-22 2015-11-25 Continental Automotive GmbH Injector for injecting fluid
DE102015209505A1 (en) * 2015-05-22 2016-11-24 Robert Bosch Gmbh fuel injector
DE102020212935A1 (en) * 2020-10-14 2022-04-14 Robert Bosch Gesellschaft mit beschränkter Haftung gas metering valve

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Also Published As

Publication number Publication date
US9394869B2 (en) 2016-07-19
EP2864623A1 (en) 2015-04-29
US20150176553A1 (en) 2015-06-25
WO2013189639A1 (en) 2013-12-27
JP2015519512A (en) 2015-07-09
JP6028095B2 (en) 2016-11-16
DE102012210424A1 (en) 2013-12-24

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