EP2472096A1 - Injection valve for injecting a fluid - Google Patents
Injection valve for injecting a fluid Download PDFInfo
- Publication number
- EP2472096A1 EP2472096A1 EP11195734A EP11195734A EP2472096A1 EP 2472096 A1 EP2472096 A1 EP 2472096A1 EP 11195734 A EP11195734 A EP 11195734A EP 11195734 A EP11195734 A EP 11195734A EP 2472096 A1 EP2472096 A1 EP 2472096A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection valve
- spring
- anchor pin
- armature
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
Definitions
- the invention relates to an injection valve for injecting a fluid, in particular for injecting fuel into the combustion chamber of an internal combustion engine or for injecting a reducing agent, such as an aqueous urea solution, into the exhaust gas line of a motor vehicle.
- the injection valve comprises a liftable injection valve member for releasing or closing at least one injection opening and a solenoid actuator for actuating the injection valve member.
- An injection valve of the aforementioned type is from the published patent application DE 196 26 576 A1 out.
- a liftable injection valve member is a valve needle which is connected at its end remote from the injection opening with an anchor.
- the armature cooperates with a solenoid to close and open the injector.
- a bobbin receives the winding of the solenoid.
- the stepped bobbin itself is received in a housing part of the injection valve and at least partially overlaps a core.
- Both the armature and the core and the housing are made of a ferromagnetic material. Through the core, the armature and the housing, a closed magnetic flux circuit is formed, wherein the armature is pulled at electrical excitation of the magnetic coil in the direction of the core.
- valve needle is lifted against the spring force of a return spring from its seat, causing an opening of the injector.
- the return spring is supported on the one hand on the valve needle, on the other hand on a support plate.
- the return spring is therefore on the side of the armature, which faces away from the core.
- magnetic coil and core that is, for the formation of the magnetic circuit, therefore, the entire diameter of the injection valve to disposal.
- a larger actuator force can be achieved.
- the present invention seeks to provide an injection valve with a solenoid actuator for direct actuation of an injection valve member, the efficiency is improved at the same installation space.
- the proposed injection valve comprises a hubbewegliches injection valve member for releasing or closing at least one injection port and a magnetic actuator with a coil, an inner pole and a lifting armature, which is energized against the spring force of a spring in the direction of the inner pole when energizing the coil, wherein the spring on the Side of the armature is arranged, which faces away from the inner pole.
- the armature comprises an anchor plate and an anchor pin, wherein the anchor pin is hydraulically coupled via a control volume with the injection valve member.
- the control volume as a hydraulic coupler volume allows depending on the selected area ratio of the hydraulic effective surfaces formed on the injection valve member and the anchor pin a force or displacement ratio.
- the force or displacement transmission allows the use of a smaller Magnetaktors or higher injection pressures with the same size Magnetaktor.
- the dynamics of the armature is increased by releasing the composite of armature and injection valve member.
- the spring for returning the armature is designed as a helical compression spring. This can then be arranged so that it surrounds the anchor pin of the armature. In this way, a space-saving compact arrangement is created.
- the spring for returning the armature is supported directly or indirectly on the anchor pin.
- a radially extending shoulder for supporting the spring is formed on the anchor pin or on a disk-shaped component connected to the anchor pin.
- the anchor pin can therefore also be constructed in several parts. If the radially extending shoulder is formed directly on the anchor pin itself, this is preferably done in the form of a section-wise increase in diameter.
- the anchor pin can also have an increase in diameter as a support surface for such a disk-shaped component.
- the anchor pin may have a circumferential groove or cut (two-flattened) into which the disk-shaped component is inserted. Preferably, the insertion takes place with installation of the injection valve.
- the disc-shaped component connected to the anchor pin has a central opening for receiving the anchor pin, wherein the central opening is guided radially outward, so that the disk-shaped component is interrupted. Due to the interruption, it is possible to postpone the disc-shaped component from the side.
- This type of connection facilitates in particular the insertion of the disk-shaped component in a circumferential groove of the anchor pin.
- the disc-shaped component has a centering, by means of which it is secured against radial displacement.
- a fixation of the spring over the disc-shaped member is permanently ensured.
- a passage hole or blind hole may be provided in the anchor plate into which the anchor pin is inserted.
- An inserted into a blind hole anchor pin has the advantage that with worse soft magnetic properties of the material of the anchor pin against the material of the anchor plate, the actuator force can be further increased.
- the spring is preferably supported with a further end on a housing part or on a plate-shaped component connected to a housing part.
- the housing part or the plate-shaped component has a central bore for receiving the anchor pin, which is guided through the housing part or the plate-shaped component. This can also be designed as a guide for the anchor pin.
- the side facing away from the spring of the housing part or the plate-shaped component can serve as a stop surface for the anchor plate and thus the stroke limit of the armature. In order to avoid stray fluxes over the back of the housing part or the plate-shaped component, this is preferably made of an amagnetic material. As a result, the actuator force can also be increased.
- the housing part or the plate-shaped component can have openings through which the fluid to be injected can flow. Thus, hydraulic deflections are avoided and ensures optimum flow control.
- the composite of anchor pin, anchor plate, spring and possibly plate-shaped member for supporting the spring can first be mounted outside of the space and then used as a part.
- the spring can then be axially biased, so that all parts are easy to assemble.
- the anchor pin is further surrounded by a liftable sleeve, which serves as a hydraulic translator and is hydraulically coupled to the force and / or Wegverstärkung with the injection valve member.
- a liftable sleeve which serves as a hydraulic translator and is hydraulically coupled to the force and / or Wegverstärkung with the injection valve member.
- the sleeve can be inserted in a guide bore of a housing part of the injection valve, preferably in a guide bore of the valve body, and possibly supported on the housing part via a collar region.
- the sleeve also be supported on a further housing part of the injection valve, preferably on the nozzle body.
- the injection valve according to the invention is composed of several housing parts.
- a first housing part is the nozzle body 15, in which a needle-shaped injection valve member 1 is received, via the lifting movement at least one injection port (not shown) is releasable or closable.
- a high pressure line 14 the side is formed in the nozzle body 15, the fluid to be injected is guided in the direction of the injection opening.
- the injection valve member 1 limits the nozzle body 15, a control volume 7, via which the injection valve member 1 with an armature 5 of a solenoid actuator 2 is hydraulically coupled.
- the armature 5 is designed as a replacement anchor and has an anchor plate 5. 1 and an anchor pin 5.2 connected thereto.
- the armature 5 is received in a further housing part 11, which is attached to the nozzle body 15 and connected by means of a clamping nut 18 with this.
- a valve body which is designed in several parts in the illustrated embodiment. Between two parts of the valve body, a plate-shaped member 12 is inserted with a central bore through which the anchor pin 5.2 of the armature 5 is guided.
- the anchor plate 5.1 is arranged on the injection valve member 1 side facing away from the plate-shaped member 12.
- the plate-shaped component 12 serves to support a spring 6, whose spring force acts on the armature 5 in a direction which is opposite to the opening stroke of the injection valve member 1. To raise the injection valve member 1, therefore, the spring force of the spring 6 must be overcome.
- a coil 3 of the magnetic actuator 2 is energized, resulting in the formation of a magnetic circuit extending over an inner pole 4 of the magnetic actuator 2. Since the inner pole 4 - apart from flow channels, not shown, such as one or more grooves or an annular gap - is formed as a solid body, the entire cross section of the inner pole 4 for forming the magnetic circuit is available, which causes a high force acting on the armature 5 magnetic force , The armature 5 moves against the spring force of the spring 6 in the direction of the inner pole 4. If the energization of the coil 3 is completed, the spring 6 ensures the return of the armature 5 in its initial position. For this purpose, the spring 6 is supported with its other end on a radially extending shoulder 9 of the anchor pin 5.2.
- the hydraulic coupling of the injection valve member 1 with the armature 5 has the advantage that on the area ratio of the hydraulically active surfaces, a force or path gain can be achieved, so that the use of a magnetic actuator 2 for direct actuation of the injection valve member 1 is possible.
- a force amplification is effected.
- the area ratio is chosen vice versa, a path gain is effected.
- Fig. 2 shows a development of the embodiment of the Fig. 1 , which additionally comprises a liftable sleeve 13 as a distinguishing feature, which surrounds the anchor pin 5.2.
- the sleeve 13 is also hydraulically coupled via the control volume 7 with the injection valve member 1, so that a further hydraulically effective surface is available for the realization of a force and / or path gain.
- the sleeve 13 is designed as a collar sleeve, the collar of the support of the sleeve 13 on the housing part 11 and thus the stroke limit is used.
- the sleeve 13 can also be supported on its end face on the nozzle body 15, so that the federal government can be omitted.
- This variant is exemplary in the Fig. 3 shown.
- the injection valve member 1 can be acted upon in the opening direction by the spring force of a spring 16, as shown in the Fig. 2 is indicated.
- Fig. 3 is different from that of Fig. 2 further characterized in that the anchor pin 5.2 is inserted in a blind hole of the anchor plate 5.1. If the anchor pin 5.2 is made of a material which has poorer soft magnetic properties than that of the anchor plate 5.1, this nevertheless has no negative influence on the actuatable actuator force. In this case, the in Fig. 3 illustrated embodiment against the of Fig. 2 the advantage of increased actuator power.
- Fig. 4 shows a further preferred embodiment of the invention.
- the sleeve 13 is again designed as a simple sleeve and supported on the nozzle body 15.
- the opening stroke of the injection valve member 1 is supported by the spring force of a spring 16.
- the housing part 11 and the valve body is made in one piece, so that a separate plate-shaped component 12 is dispensable. This advantageously reduces the number of high pressure sealing points.
- a sealing ring 17 is inserted.
- the valve body has instead of a separate plate-shaped member 12 has a radially inwardly projecting shoulder, which at the same time as a guide 19 serves for the anchor pin 5.2. This is executed in several parts, in contrast to the previous examples and comprises a disc-shaped member 8 for forming a radially extending shoulder 9, on which the spring 6 is supported.
- a circumferential groove or key surfaces can be formed on the anchor pin 5.2, into which the disk-shaped component 8 is inserted.
- the anchor pin 5.2 can also be a paragraph formed by a first disc-shaped member 8.1, which is fixedly connected to the anchor pin 5.2 and serves to receive a second disk-shaped member 8.2.
- This variant is exemplary in the Fig. 5 shown.
- this is provided with an opening 10 which is formed asymmetrically and the component breaks through 8.2 (see Fig. 6 ).
- the spring 5 serving to restore the armature 5 can be fixed during the assembly of the injection valve.
- the two disc-shaped components 8.1 and 8.2 may also be designed as a component 8.
- the component 8 preferably has a centering 20, via which it is secured against radial displacement (see Fig. 7 ).
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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)
Abstract
Description
Die Erfindung betrifft ein Einspritzventil zum Einspritzen eines Fluids, insbesondere zum Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine oder zum Einspritzen eines Reduktionsmittels, wie beispielsweise einer wässrigen Harnstofflösung, in den Abgasstrang eines Kraftfahrzeuges. Das Einspritzventil umfasst ein hubbewegliches Einspritzventilglied zum Freigeben oder Verschließen wenigstens einer Einspritzöffnung sowie einen Magnetaktor zur Betätigung des Einspritzventilgliedes.The invention relates to an injection valve for injecting a fluid, in particular for injecting fuel into the combustion chamber of an internal combustion engine or for injecting a reducing agent, such as an aqueous urea solution, into the exhaust gas line of a motor vehicle. The injection valve comprises a liftable injection valve member for releasing or closing at least one injection opening and a solenoid actuator for actuating the injection valve member.
Ein Einspritzventil der vorstehend genannten Art geht aus der Offenlegungsschrift
Mit steigenden Einspritzdrücken steigt jedoch die zur direkten Betätigung des Einspritzventilgliedes erforderliche Aktorkraft, so dass der Einsatz größerer und damit stärkerer Magnetaktoren notwendig ist. Dies scheitert in der Regel jedoch daran, dass der Bauraum begrenzt ist.With increasing injection pressures, however, increases the required for direct actuation of the injection valve member actuator force, so that the use of larger and thus stronger magnetic actuators is necessary. This usually fails, however, because the space is limited.
Ausgehend von dem vorstehend genannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Einspritzventil mit einem Magnetaktor zur direkten Betätigung eines Einspritzventilgliedes bereit zu stellen, dessen Wirkungsgrad bei gleichbleibendem Bauraum verbessert ist.Based on the above-mentioned prior art, the present invention seeks to provide an injection valve with a solenoid actuator for direct actuation of an injection valve member, the efficiency is improved at the same installation space.
Zur Lösung der Aufgabe wird ein Einspritzventil mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind in den auf Anspruch 1 direkt oder indirekt rückbezogenen Unteransprüchen angegeben.To solve the problem, an injection valve with the features of
Das vorgeschlagene Einspritzventil umfasst ein hubbewegliches Einspritzventilglied zum Freigeben oder Verschließen wenigstens einer Einspritzöffnung sowie einen Magnetaktor mit einer Spule, einem Innenpol und einem hubbeweglichen Anker, der bei Bestromung der Spule entgegen der Federkraft einer Feder in Richtung des Innenpols bewegbar ist, wobei die Feder auf der Seite des Ankers angeordnet ist, welche vom Innenpol abgewandt ist. Erfindungsgemäß umfasst der Anker einen Ankerteller und einen Ankerstift, wobei der Ankerstift über ein Steuervolumen mit dem Einspritzventilglied hydraulisch koppelbar ist. Das Steuervolumen als hydraulisches Kopplervolumen ermöglicht in Abhängigkeit vom jeweils gewählten Flächenverhältnis der am Einspritzventilglied und am Ankerstift ausgebildeten hydraulisch wirksamen Flächen eine Kraft- oder Wegübersetzung. Die Kraft- oder Wegübersetzung erlaubt den Einsatz eines kleineren Magnetaktors bzw. höhere Einspritzdrücke bei gleich großem Magnetaktor. Zudem wird durch Lösen des Verbunds aus Anker und Einspritzventilglied die Dynamik des Ankers erhöht.The proposed injection valve comprises a hubbewegliches injection valve member for releasing or closing at least one injection port and a magnetic actuator with a coil, an inner pole and a lifting armature, which is energized against the spring force of a spring in the direction of the inner pole when energizing the coil, wherein the spring on the Side of the armature is arranged, which faces away from the inner pole. According to the invention, the armature comprises an anchor plate and an anchor pin, wherein the anchor pin is hydraulically coupled via a control volume with the injection valve member. The control volume as a hydraulic coupler volume allows depending on the selected area ratio of the hydraulic effective surfaces formed on the injection valve member and the anchor pin a force or displacement ratio. The force or displacement transmission allows the use of a smaller Magnetaktors or higher injection pressures with the same size Magnetaktor. In addition, the dynamics of the armature is increased by releasing the composite of armature and injection valve member.
Vorteilhafterweise ist die Feder zur Rückstellung des Ankers als Schraubendruckfeder ausgebildet. Diese kann dann derart angeordnet werden, dass sie den Ankerstift des Ankers umgibt. Auf diese Weise wird eine bauraumschonende kompakte Anordnung geschaffen.Advantageously, the spring for returning the armature is designed as a helical compression spring. This can then be arranged so that it surrounds the anchor pin of the armature. In this way, a space-saving compact arrangement is created.
Bevorzugt ist die Feder zur Rückstellung des Ankers unmittelbar oder mittelbar am Ankerstift abgestützt. Weiterhin bevorzugt ist hierzu am Ankerstift oder an einem mit dem Ankerstift verbundenen scheibenförmigen Bauteil ein radial verlaufender Absatz zur Abstützung der Feder ausgebildet. Der Ankerstift kann demnach auch mehrteilig aufgebaut sein. Sofern der radial verlaufende Absatz direkt am Ankerstift selbst ausgebildet ist, erfolgt dies bevorzugt in Form einer abschnittsweisen Durchmesservergrößerung. Darüber hinaus kann der Ankerstift auch eine Durchmesservergrößerung als Auflagefläche für ein solches scheibenförmiges Bauteil aufweisen. Alternativ oder ergänzend zu einer Durchmesservergrößerung kann der Ankerstift eine Umfangsnut oder Anfräsung (Zweiflach) aufweisen, in welche das scheibenförmige Bauteil eingelegt ist. Vorzugsweise erfolgt das Einlegen mit Montage des Einspritzventils.Preferably, the spring for returning the armature is supported directly or indirectly on the anchor pin. Further preferred for this purpose, a radially extending shoulder for supporting the spring is formed on the anchor pin or on a disk-shaped component connected to the anchor pin. The anchor pin can therefore also be constructed in several parts. If the radially extending shoulder is formed directly on the anchor pin itself, this is preferably done in the form of a section-wise increase in diameter. In addition, the anchor pin can also have an increase in diameter as a support surface for such a disk-shaped component. Alternatively or in addition to an increase in diameter, the anchor pin may have a circumferential groove or cut (two-flattened) into which the disk-shaped component is inserted. Preferably, the insertion takes place with installation of the injection valve.
Zur Vereinfachung der Montage wird vorgeschlagen, dass das mit dem Ankerstift verbundene scheibenförmige Bauteil eine zentrale Öffnung zur Aufnahme des Ankerstifts besitzt, wobei die zentrale Öffnung nach radial außen geführt ist, so dass das scheibenförmige Bauteil unterbrochen ist. Durch die Unterbrechung ist es möglich, das scheibenförmige Bauteil von der Seite aufzuschieben. Diese Art der Verbindung erleichtert insbesondere das Einsetzen des scheibenförmigen Bauteils in eine Umfangsnut des Ankerstifts.To simplify the assembly, it is proposed that the disc-shaped component connected to the anchor pin has a central opening for receiving the anchor pin, wherein the central opening is guided radially outward, so that the disk-shaped component is interrupted. Due to the interruption, it is possible to postpone the disc-shaped component from the side. This type of connection facilitates in particular the insertion of the disk-shaped component in a circumferential groove of the anchor pin.
Ferner wird vorgeschlagen, dass das scheibenförmige Bauteil eine Zentrierung aufweist, mittels welcher es gegen radiales Verschieben gesichert ist. Somit ist eine Fixierung der Feder über das scheibenförmige Bauteil dauerhaft sichergestellt.It is also proposed that the disc-shaped component has a centering, by means of which it is secured against radial displacement. Thus, a fixation of the spring over the disc-shaped member is permanently ensured.
Zur Verbindung des Ankerstifts mit dem Ankerteller kann im Ankerteller eine Durchgangs- oder Sacklochbohrung vorgesehen sein, in welche der Ankerstift eingesetzt ist.To connect the anchor pin to the anchor plate, a passage hole or blind hole may be provided in the anchor plate into which the anchor pin is inserted.
Ein in eine Sacklochbohrung eingesetzter Ankerstift weist den Vorteil auf, dass bei schlechteren weichmagnetischen Eigenschaften des Materials des Ankerstifts gegenüber dem Material des Ankertellers die Aktorkraft weiter erhöht werden kann.An inserted into a blind hole anchor pin has the advantage that with worse soft magnetic properties of the material of the anchor pin against the material of the anchor plate, the actuator force can be further increased.
Bevorzugt ist die Feder mit einem weiteren Ende an einem Gehäuseteil oder an einem mit einem Gehäuseteil verbundenen tellerförmigen Bauteil abgestützt. Das Gehäuseteil bzw. das tellerförmige Bauteil weist zur Aufnahme des Ankerstifts, welcher durch das Gehäuseteil oder das tellerförmige Bauteil hindurch geführt ist, eine zentrale Bohrung auf. Diese kann ferner als Führung für den Ankerstift ausgelegt sein. Des Weiteren kann die der Feder abgewandte Seite des Gehäuseteils bzw. des tellerförmigen Bauteils als Anschlagfläche für den Ankerteller und damit der Hubbegrenzung des Ankers dienen. Um Streuflüsse über die Rückseite des Gehäuseteils bzw. des tellerförmigen Bauteils zu vermeiden, ist dieses bevorzugt aus einem amagnetischen Material gefertigt. Dadurch kann ebenfalls die Aktorkraft erhöht werden. Ferner kann das Gehäuseteil oder das tellerförmige Bauteil Durchbrüche aufweisen, durch welche das einzuspritzenden Fluid hindurch strömen kann. Somit werden hydraulische Umlenkungen vermieden und eine optimale Strömungsführung gewährleistet.The spring is preferably supported with a further end on a housing part or on a plate-shaped component connected to a housing part. The housing part or the plate-shaped component has a central bore for receiving the anchor pin, which is guided through the housing part or the plate-shaped component. This can also be designed as a guide for the anchor pin. Furthermore, the side facing away from the spring of the housing part or the plate-shaped component can serve as a stop surface for the anchor plate and thus the stroke limit of the armature. In order to avoid stray fluxes over the back of the housing part or the plate-shaped component, this is preferably made of an amagnetic material. As a result, the actuator force can also be increased. Furthermore, the housing part or the plate-shaped component can have openings through which the fluid to be injected can flow. Thus, hydraulic deflections are avoided and ensures optimum flow control.
Der Verbund von Ankerstift, Ankerteller, Feder und ggf. tellerförmiges Bauteil zur Abstützung der Feder kann zunächst außerhalb des Bauraums montiert und danach als ein Teil eingesetzt werden. Mittels eines seitlich aufschiebbaren scheibenförmigen Bauteils kann dann die Feder axial vorgespannt werden, so dass sämtliche Teile leicht zu montieren sind.The composite of anchor pin, anchor plate, spring and possibly plate-shaped member for supporting the spring can first be mounted outside of the space and then used as a part. By means of a laterally slidable disc-shaped component, the spring can then be axially biased, so that all parts are easy to assemble.
Wird die Abstützung der Feder über ein Gehäuseteil, beispielsweise den Ventilkörper, bewirkt, ist ein separates tellerförmiges Bauteil entbehrlich. Dies wirkt sich vorteilhaft aus, da zusätzliche Hochdruckdichtstellen entfallen.If the support of the spring via a housing part, such as the valve body, causes a separate plate-shaped component is unnecessary. This has an advantageous effect, since additional high-pressure sealing points are eliminated.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Ankerstift ferner von einer hubbeweglichen Hülse umgeben, welche als hydraulischer Übersetzer dient und zur Kraft-und/oder Wegverstärkung mit dem Einspritzventilglied hydraulisch koppelbar ist. Die Hülse kann hierzu in einer Führungsbohrung eines Gehäuseteils des Einspritzventils, vorzugsweise in einer Führungsbohrung des Ventilkörpers, eingesetzt und ggf. über einen Bundbereich am Gehäuseteil abgestützt sein. Des Weiteren kann die Hülse auch an einem weiteren Gehäuseteil des Einspritzventils, vorzugsweise am Düsenkörper, abgestützt sein.According to a preferred embodiment of the invention, the anchor pin is further surrounded by a liftable sleeve, which serves as a hydraulic translator and is hydraulically coupled to the force and / or Wegverstärkung with the injection valve member. For this purpose, the sleeve can be inserted in a guide bore of a housing part of the injection valve, preferably in a guide bore of the valve body, and possibly supported on the housing part via a collar region. Furthermore, the sleeve also be supported on a further housing part of the injection valve, preferably on the nozzle body.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher beschrieben. Diese zeigen:
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Fig. 1 einen Längsschnitt durch ein erstes erfindungsgemäßes Einspritzventil im Bereich des Magnetaktors, -
Fig. 2 einen Längsschnitt durch ein zweites erfindungsgemäßes Einspritzventil im Bereich des Magnetaktors, -
Fig.3 einen Längsschnitt durch ein drittes erfindungsgemäßes Einspritzventil im Bereich des Magnetaktors, -
Fig. 4 einen Längsschnitt durch ein viertes erfindungsgemäßes Einspritzventil im Bereich des Magnetaktors, -
Fig. 5 einen Längsschnitt durch ein fünftes erfindungsgemäßes Einspritzventil im Bereich der Federabstützung, -
Fig. 6 eine Draufsicht auf ein scheibenförmiges Bauteil zur Abstützung der Feder und -
Fig. 7 einen Längsschnitt durch ein sechstes erfindungsgemäßes Einspritzventil im Bereich der Federabstützung.
-
Fig. 1 a longitudinal section through a first inventive injection valve in the region of the magnetic actuator, -
Fig. 2 a longitudinal section through a second injection valve according to the invention in the region of the magnetic actuator, -
Figure 3 a longitudinal section through a third injection valve according to the invention in the region of the magnetic actuator, -
Fig. 4 a longitudinal section through a fourth injection valve according to the invention in the region of the magnetic actuator, -
Fig. 5 a longitudinal section through a fifth injection valve according to the invention in the spring support, -
Fig. 6 a plan view of a disc-shaped member for supporting the spring and -
Fig. 7 a longitudinal section through a sixth injection valve according to the invention in the spring support.
Dem Längsschnitt der
Das Einspritzventilglied 1 begrenzt im Düsenkörper 15 ein Steuervolumen 7, über welches das Einspritzventilglied 1 mit einem Anker 5 eines Magnetaktors 2 hydraulisch koppelbar ist. Der Anker 5 ist als Tauschanker ausgeführt und weist einen Ankerteller 5. 1 sowie einen hiermit verbundenen Ankerstift 5.2 auf. Der Anker 5 ist in einem weiteren Gehäuseteil 11 aufgenommen, welcher an den Düsenkörper 15 angesetzt und mittels einer Spannmutter 18 mit diesem verbunden ist. Bei dem weiteren Gehäuseteil 11 handelt es sich um einen Ventilkörper, welcher im dargestellten Ausführungsbeispiel mehrteilig ausgeführt ist. Zwischen zwei Teilen des Ventilkörpers ist ein tellerförmiges Bauteil 12 mit einer zentralen Bohrung eingesetzt, durch welche der Ankerstift 5.2 des Ankers 5 hindurch geführt ist. Der Ankerteller 5.1 ist auf der dem Einspritzventilglied 1 abgewandten Seite des tellerförmigen Bauteils 12 angeordnet. Das tellerförmige Bauteil 12 dient der Abstützung einer Feder 6, deren Federkraft den Anker 5 in eine Richtung beaufschlagt, welche dem Öffnungshub des Einspritzventilgliedes 1 entgegengesetzt ist. Zum Anheben des Einspritzventilgliedes 1 muss demnach die Federkraft der Feder 6 überwunden werden.The
Um ein Anheben des Einspritzventilgliedes 1 zu bewirken, wird eine Spule 3 des Magnetaktors 2 bestromt, was zur Ausbildung eines Magnetkreises führt, der sich über einen Innenpol 4 des Magnetaktors 2 erstreckt. Da der Innenpol 4 - abgesehen von nicht dargestellten Strömungskanälen, wie beispielsweise eine oder mehrere Nuten oder einen Ringspalt - als Vollkörper ausgebildet ist, steht der gesamte Querschnitt des Innenpols 4 zur Ausbildung des Magnetkreises zur Verfügung, was eine hohe auf den Anker 5 wirkende Magnetkraft bewirkt. Der Anker 5 bewegt sich entgegen der Federkraft der Feder 6 in Richtung des Innenpols 4. Wird die Bestromung der Spule 3 beendet, gewährleistet die Feder 6 die Rückstellung des Ankers 5 in seine Ausgangsposition. Die Feder 6 ist hierzu mit ihrem anderen Ende an einem radial verlaufenden Absatz 9 des Ankerstifts 5.2 abgestützt.In order to cause lifting of the
Die hydraulische Kopplung des Einspritzventilgliedes 1 mit dem Anker 5 weist den Vorteil auf, dass über das Flächenverhältnis der hydraulisch wirksamen Flächen eine Kraft- oder Wegverstärkung erzielbar ist, so dass der Einsatz eines Magnetaktors 2 zur direkten Betätigung des Einspritzventilgliedes 1 möglich ist. Denn ist die hydraulisch wirksame Fläche am Ankerstift 5.2 kleiner als die am Einspritzventilglied 1 ausgebildete hydraulisch wirksame Fläche gewählt, wird eine Kraftverstärkung bewirkt. Ist das Flächenverhältnis umgekehrt gewählt, wird eine Wegverstärkung bewirkt.The hydraulic coupling of the
Das Ausführungsbeispiel der
Zur Verbindung des scheibenförmigen Bauteils 8 mit dem Ankerstift 5.2 können am Ankerstift 5.2 eine Umfangsnut oder Schlüsselflächen ausgebildet sein, in welche das scheibenförmige Bauteil 8 eingesetzt ist. Am Ankerstift 5.2 kann aber auch ein Absatz durch ein erstes scheibenförmiges Bauteil 8.1 ausgebildet sein, das fest mit dem Ankerstift 5.2 verbunden ist und der Aufnahme eines zweiten scheibenförmigen Bauteils 8.2 dient. Diese Variante ist beispielhaft in der
Darüber hinaus können bei Einbringen einer Umfangsnut oder Schlüsselfläche in den Ankerstift 5.2 die beiden scheibenförmigen Bauteile 8.1 und 8.2 auch als ein Bauteil 8 ausgeführt sein. Das Bauteil 8 weist vorzugsweise eine Zentrierung 20 auf, über welche es gegen radiales Verschieben gesichert ist (siehe
Die Fixierung der Feder 6 über ein separates scheibenförmiges Bauteil 8, das erst bei der Montage auf den Ankerstift 5.2 aufgeschoben wird, besitzt gegenüber einem am Ankerstift 5.2 ausgebildeten vorspringenden Bund entsprechend dem Beispiel der
Claims (8)
dadurch gekennzeichnet, dass die Feder (6) als Schraubendruckfeder ausgebildet ist und den Ankerstift (5.2) umgibt.Injection valve according to claim 1,
characterized in that the spring (6) is designed as a helical compression spring and the anchor pin (5.2) surrounds.
dadurch gekennzeichnet, dass die Feder (6) unmittelbar oder mittelbar am Ankerstift (5.2) abgestützt ist.Injection valve according to one of the preceding claims,
characterized in that the spring (6) is supported directly or indirectly on the anchor pin (5.2).
dadurch gekennzeichnet, dass am Ankerstift (5.2) oder an einem mit dem Ankerstift (5.2) verbundenen scheibenförmigen Bauteil (8) ein radial verlaufender Absatz (9) zur Abstützung der Feder (6) ausgebildet ist.Injection valve according to one of the preceding claims,
characterized in that a radially extending shoulder (9) for supporting the spring (6) is formed on the anchor pin (5.2) or on a disc-shaped component (8) connected to the anchor pin (5.2).
dadurch gekennzeichnet, dass das mit dem Ankerstift (5.2) verbundene scheibenförmige Bauteil (8) eine zentrale Öffnung (10) zur Aufnahme des Ankerstifts (5.2) besitzt, wobei die zentrale Öffnung (10) nach radial außen geführt ist, so dass das scheibenförmige Bauteil (8) unterbrochen ist.Injection valve according to claim 4,
characterized in that the disc-shaped component (8) connected to the anchor pin (5.2) has a central opening (10) for receiving the anchor pin (5.2) has, wherein the central opening (10) is guided radially outward, so that the disc-shaped member (8) is interrupted.
dadurch gekennzeichnet, dass das scheibenförmige Bauteil (8) mittels einer Zentrierung (20) gegen radiales Verschieben gesichert ist.Injection valve according to claim 4 or 5,
characterized in that the disk-shaped component (8) by means of a centering (20) is secured against radial displacement.
dadurch gekennzeichnet, dass die Feder (6) mit einem weiteren Ende an einem Gehäuseteil (11) oder an einem mit einem Gehäuseteil (11) verbundenen tellerförmigen Bauteil (12) abgestützt ist.Injection valve according to one of the preceding claims,
characterized in that the spring (6) with a further end on a housing part (11) or on a with a housing part (11) connected plate-shaped member (12) is supported.
dadurch gekennzeichnet, dass der Ankerstift (5.2) von einer hubbeweglichen Hülse (13) umgeben ist, welche als hydraulischer Übersetzer dient und zur Kraft-und/oder Wegverstärkung mit dem Einspritzventilglied (1) hydraulisch koppelbar ist.Injection valve according to one of the preceding claims,
characterized in that the anchor pin (5.2) by a liftable sleeve (13) is surrounded, which serves as a hydraulic translator and for force and / or Wegverstärkung with the injection valve member (1) is hydraulically coupled.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110002422 DE102011002422A1 (en) | 2011-01-04 | 2011-01-04 | Injection valve for injecting a fluid |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2472096A1 true EP2472096A1 (en) | 2012-07-04 |
Family
ID=45495677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11195734A Withdrawn EP2472096A1 (en) | 2011-01-04 | 2011-12-27 | Injection valve for injecting a fluid |
Country Status (2)
Country | Link |
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EP (1) | EP2472096A1 (en) |
DE (1) | DE102011002422A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8097967B2 (en) | 2008-06-30 | 2012-01-17 | Demand Energy Networks, Inc. | Energy systems, energy devices, energy utilization methods, and energy transfer methods |
DE102013224863A1 (en) | 2013-12-04 | 2015-06-11 | Robert Bosch Gmbh | Magnetic actuator for a fuel injector and fuel injector |
DE102016206882A1 (en) * | 2016-04-22 | 2017-10-26 | Zf Friedrichshafen Ag | Magnetic actuator, valve and locking device with a pressure booster |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19626576A1 (en) | 1996-07-02 | 1998-01-08 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engine |
DE102007002758A1 (en) * | 2006-04-04 | 2007-10-11 | Robert Bosch Gmbh | fuel injector |
DE102009047559A1 (en) * | 2009-12-07 | 2011-06-09 | Robert Bosch Gmbh | fuel injector |
EP2386746A2 (en) * | 2010-05-11 | 2011-11-16 | Robert Bosch GmbH | Fuel injector |
-
2011
- 2011-01-04 DE DE201110002422 patent/DE102011002422A1/en not_active Withdrawn
- 2011-12-27 EP EP11195734A patent/EP2472096A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19626576A1 (en) | 1996-07-02 | 1998-01-08 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engine |
DE102007002758A1 (en) * | 2006-04-04 | 2007-10-11 | Robert Bosch Gmbh | fuel injector |
DE102009047559A1 (en) * | 2009-12-07 | 2011-06-09 | Robert Bosch Gmbh | fuel injector |
EP2386746A2 (en) * | 2010-05-11 | 2011-11-16 | Robert Bosch GmbH | Fuel injector |
Also Published As
Publication number | Publication date |
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DE102011002422A1 (en) | 2012-07-05 |
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