EP1966484B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1966484B1
EP1966484B1 EP06807772A EP06807772A EP1966484B1 EP 1966484 B1 EP1966484 B1 EP 1966484B1 EP 06807772 A EP06807772 A EP 06807772A EP 06807772 A EP06807772 A EP 06807772A EP 1966484 B1 EP1966484 B1 EP 1966484B1
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EP
European Patent Office
Prior art keywords
valve
valve seat
fuel injection
closing body
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
EP06807772A
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German (de)
French (fr)
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EP1966484A1 (en
Inventor
Ferdinand Reiter
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
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Robert Bosch GmbH
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Publication date
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Publication of EP1966484A1 publication Critical patent/EP1966484A1/en
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Publication of EP1966484B1 publication Critical patent/EP1966484B1/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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/042—The valves being provided with fuel passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • FIG. 1 a known fuel injection valve of the prior art is shown, which has a classic three-part construction of an inner metal flow guide member and at the same time housing component.
  • This inner valve tube is formed from an inlet port forming an inner pole, a nonmagnetic intermediate part and a valve seat carrier receiving a valve seat.
  • an axially movable valve needle is arranged, which comprises an armature and a spherical valve closing body and a connecting tube connecting the armature with the valve closing body.
  • the three individual components of the valve needle are firmly connected to each other by means of a cohesive joining process, in particular welding.
  • an axially movable valve needle is arranged, which comprises a sleeve-shaped armature and a spherical valve closing body and a connecting tube connecting the armature with the valve closing body.
  • the Connecting pipe is firmly connected by means of welds with the armature and also with the valve closing body.
  • the valve closing body cooperates with a frusto-conical valve seat surface of a metal valve seat body.
  • the valve seat body is firmly connected by means of a weld with the valve seat carrier.
  • the fuel injection valve has a spherical valve closing body cooperating with a valve seat, which is attached to a closing body carrier in the form of a plastic tube, while at the opposite end of the valve closing body, an anchor is attached to the plastic tube. Together, these components form an axially movable valve needle.
  • the lower end of the plastic tube is dome-shaped, wherein in the curved recess of the valve closing body is positively held by means of a snap connection.
  • the plastic tube is designed to be resilient in the region of the lower recess, since holding jaws have to embrace the valve closing body.
  • the spherical valve closing body may be made of steel, a ceramic or a plastic.
  • the valve closing body cooperates with a frusto-conical valve seat surface of a metal valve seat body.
  • the valve seat body is firmly connected by means of a weld with the valve seat carrier.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that a simplified and cost-effective production and automatic assembly of the valve and in particular of the valve seat body can be realized because of cohesive joining methods, such as welding, which have the disadvantage of heat distortion, and complex positive connection techniques can be waived. Rather, particularly advantageous press connections between a metal component partner and a non-metallic component partner can be used, which are simple and very safe and reliable attachable.
  • the arrangement according to the invention also has the advantage of reducing the structure-borne noise and thus the noise development compared with known solutions.
  • valve seat body it is particularly advantageous to fasten the valve seat body by pressing into the valve seat carrier.
  • the valve seat body is made of a ceramic material, whereby the mass of the fuel injection valve can be reduced.
  • the valve seat carrier is made of a plastic. From the reduced mass of these components, there are the advantages of better dynamics of the valve and a reduced noise.
  • the plastic-ceramic press connections can be produced particularly reliably and reliably if the sawtooth-like structures are optimally formed in the overlapping areas of valve seat body and valve seat carrier.
  • the sawtooth-like structure of the ceramic component valve seat body penetrates into the plastic of the valve seat carrier, and the plastic relaxes subsequently.
  • FIG. 1 a fuel injection valve in a known embodiment according to the prior art
  • FIG. 2 an embodiment of a fuel injection valve according to the invention
  • FIG. 3 a valve seat body in the inventive design
  • FIG. 4 a plan view of the valve seat body according to FIG. 3 ,
  • FIG. 1 For the sake of better understanding of the invention, a fuel injection valve in a known embodiment according to the prior art is shown. That in the FIG. 1
  • electromagnetically actuated valve in the form of an injector for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines has a magnetic coil 1, serving as a fuel inlet nozzle and inner pole core 2, which is for example tubular here and over its entire length has a constant outer diameter.
  • a coil body 3 stepped in the radial direction accommodates a winding of the magnet coil 1 and, in conjunction with the core 2, enables a compact construction of the injection valve in the region of the magnet coil 1.
  • a lower core end 9 of the core 2 is concentric with a valve longitudinal axis 10 tightly connected to a tubular metal non-magnetic intermediate part 12, for example by welding and surrounds the core end 9 partially axially.
  • the stepped bobbin 3 partially overlaps the core 2 and with a step 15 of larger diameter, the intermediate part 12 at least partially axially.
  • Downstream of the bobbin 3 and the intermediate part 12 extends a tubular valve seat support 16 which is fixedly connected to the intermediate part 12.
  • a tubular valve needle 19 is arranged, which is provided at its downstream end 20 with a spherical valve closing body 21, on whose circumference, for example, five flats 22 are provided for flowing past the fuel, for example by welding.
  • the valve needle 19 represents the movable actuating part of the fuel injection valve.
  • the actuation of the injection valve takes place in a known manner electromagnetically.
  • the electromagnetic circuit For axial movement of the valve needle 19 and thus to open against the spring force of a return spring 25 and closing the injector is the electromagnetic circuit with the solenoid 1, the core 2 and an armature 27.
  • the armature 27 is remote from the valve closing body 21 end of Valve needle 19 is connected by a weld 28 and aligned with the core 2.
  • the core 2 remote from the end of the valve seat support 16 is in the longitudinal bore 17, a cylindrical metal valve seat body 29 having a fixed valve seat 30, mounted by welding tight.
  • valve closing body 21 For guiding the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the valve longitudinal axis 10 serves a guide opening 32 of the valve seat body 29.
  • the spherical valve closing body 21 cooperates with the frusto-conical in the flow direction valve seat of the valve seat body 29.
  • the valve seat body 29 At its end facing away from the valve closing body 21, the valve seat body 29 is provided with an injection-molded perforated disc 34, for example in the shape of a pot concentric and firmly connected.
  • the spray perforated disk 34 In the bottom part of the spray perforated disk 34 extends at least one, for example, four formed by eroding or punching ejection openings 39th
  • the depth of insertion of the valve seat body 29 with the cup-shaped spray disk 34 determines the default setting of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 is fixed at non-energized solenoid 1 by the system of the valve closing body 21 on the valve seat of the valve seat body 29, while the other end position the valve needle 19 results in excited magnetic coil 1 by the system of the armature 27 at the core end 9.
  • the injection valve is largely enclosed by a plastic extrusion coating 50.
  • a plastic filter 61 protrudes into the flow bore 46 of the core 2 at its inlet end 55 and ensures the filtering out of such fuel constituents that could cause blockages or damage due to their size in the injection valve.
  • FIG. 2 an embodiment of a fuel injection valve according to the invention is shown.
  • the fuel injection valve is designed with a particularly simple and lightweight construction.
  • a plurality of components of the fuel injection valve are made for example of a plastic or of a ceramic material, whereby a mass reduction of the fuel injection valve is made possible.
  • the components valve seat carrier 16 and valve needle 19 are formed from a plastic. From a plastic injection of the fuel injection valve in the classical sense can therefore no longer be spoken, as several of the valve housing forming components themselves are made directly from plastic.
  • a plastic connecting piece 51 forms, for example, the inflow channel of the fuel injection valve and takes up the fuel filter 61.
  • the bobbin 3 is for example, such that it integrally emerges from the electrical connector 52 with him.
  • the valve needle 19 consists in the embodiment shown of three individual components, which together form the component valve needle 19.
  • the anchor 27, e.g. is formed as a rotating part, thereby forming a first individual component, while a spherical valve-closure member 21 is a second individual component of the valve needle 19.
  • a connecting tube 23 connecting the armature 27 to the valve closing body 21 constitutes a closing body carrier.
  • the connecting tube 23 is e.g. produced by plastic injection molding and has an inner longitudinal opening, from which open several transverse openings.
  • the transverse openings may optionally be provided with a mesh fabric 80 made of plastic or metal, which is attached in the injection molding process of the connecting tube 23 as an insert.
  • the armature 27 has a sawtooth-like structure 63a with a "Christmas tree profile".
  • This structure 63a corresponds to an upper flared end of the connecting pipe 23 made of plastic.
  • the armature 27 is pressed with its structure 63 a in the connecting pipe 23, in such a way that the structure 63 a firmly, securely and rotationally fixed hooked at the end of the connecting pipe 23 and braced.
  • the connecting tube 23 is provided with a curved or dome-shaped recess 78.
  • the arched receiving surface of the recess 78 ideally has a slightly smaller diameter than the diameter of the spherical valve closing body 21, whereby after attaching the valve closing body 21 by applying a low contact force, a frictional connection between the connecting pipe 23 and the valve closing body 21 is formed.
  • the valve closing body 21 is pulled safely, reliably and reproducibly out of the valve seat 30 of the valve seat body 29 via the connecting tube 23 when the solenoid coil 1 is energized, although the valve closing body 21 is held "loosely" on the connecting tube 23.
  • a ceramic material for example, Si 3 N 4 offers.
  • the valve closing body 21 may be metallic or ceramic or made of a plastic.
  • sawtooth-like structure 63 a with a "fir tree profile” can for the production of secure connections between Fuel injection valve components made of metal and plastic further sawtooth-like structures 63 may be provided.
  • the core 2 at its two axial ends in each case a sawtooth-like structure 63b, 63c, which ensures that when pressed core 2 both a secure and reliable solid connection to the connecting piece 51 made of plastic and the bobbin 3 made of plastic is ensured.
  • Two further sawtooth-like structures 63d, 63e with "Christmas tree profile” are provided on a metal, magnetically conductive intermediate part 13, which is arranged below the bobbin 3 in the axial extension region of the armature 27.
  • This annular intermediate part 13 is formed, for example, in profile T-form, wherein two legs of the T-profile, the structures 63 d, 63 e have and thus provide a firm secure connection to the bobbin 3 and the valve seat carrier 16.
  • the third radially outwardly directed leg of the T-section of the intermediate part 13 is connected to a magnetic pot 14, which constitutes an outer magnet component and through which the magnetic circuit is closed.
  • valve seat body 29 is inserted into the lower end of the existing plastic valve seat carrier 16, which consists of a ceramic material.
  • the ceramic material Si 3 N 4 offers. Such a material has only about 1/3 of the mass of a comparably large component made of steel, as it is commonly used.
  • the valve seat body 29 is formed on its outer periphery with a sawtooth-like structure 63 f, which may be referred to as a "Christmas Tree Profile".
  • valve seat body 29 To establish a firm connection between the valve seat body 29 and the valve seat carrier 16, the valve seat body 29 is pressed with its structure 63 f in the valve seat carrier 16, in such a way that the structure 63 f hooked firmly, securely and rotationally fixed at the lower end of the Ventilitztitzitatis 16 and spreads.
  • the sawtooth-like structure 63f of the ceramic component valve seat body 29 thus penetrates into the plastic of the valve seat carrier 16, and the plastic subsequently relaxes.
  • FIG. 3 is a valve seat body 29 shown as a single component in an enlarged view.
  • Different design possibilities of the saw-tooth-like structure 63f are common in FIG. 3 shown. From the FIG. 3 It can be seen that the tooth form of the structure 63f can be directly pointed (Za), obliquely and perpendicularly tapered (Zb) or curved (Zc) or formed in combinations.
  • FIG. 4 is a plan view of the valve seat body 29 according to FIG. 3 , From the top view, it is clear that the guide opening 32 for the axially movable valve needle 19 may be interrupted several times with the valve closing body 21. In this respect, the guide opening 32 forms only individual guide sections, which are formed circumferentially alternately with larger diameter flow grooves 33. Through the flow grooves 33, the fuel can be passed freely in the direction of the valve seat 30. It can also be provided only a flow groove 33.
  • the energizable actuator of the fuel injection valve as the electromagnetic circuit with the solenoid coil 1, the core 2, the intermediate part 13, the magnet pot 14 and the armature 27 may e.g. also be designed as a piezoelectric or magnetostrictive drive.

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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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.

In der Figur 1 ist ein bekanntes Brennstoffeinspritzventil aus dem Stand der Technik dargestellt, das einen klassischen dreiteiligen Aufbau eines inneren metallenen Strömungsführungsteils und zugleich Gehäusebauteils besitzt. Dieses innere Ventilrohr wird aus einem einen Innenpol bildenden Einlassstutzen, einem nichtmagnetischen Zwischenteil und einem einen Ventilsitz aufnehmenden Ventilsitzträger gebildet. In dem Ventilsitzträger ist eine axial bewegbare Ventilnadel angeordnet, die einen Anker und einen kugelförmigen Ventilschließkörper sowie ein den Anker mit dem Ventilschließkörper verbindendes Verbindungsrohr umfasst. Die drei Einzelkomponenten der Ventilnadel sind mittels eines stoffschlüssigen Fügeverfahrens, insbesondere Schweißen, miteinander fest verbunden.In the FIG. 1 a known fuel injection valve of the prior art is shown, which has a classic three-part construction of an inner metal flow guide member and at the same time housing component. This inner valve tube is formed from an inlet port forming an inner pole, a nonmagnetic intermediate part and a valve seat carrier receiving a valve seat. In the valve seat carrier, an axially movable valve needle is arranged, which comprises an armature and a spherical valve closing body and a connecting tube connecting the armature with the valve closing body. The three individual components of the valve needle are firmly connected to each other by means of a cohesive joining process, in particular welding.

Aus der DE 40 08 675 A1 ist bereits ein solches elektromagnetisch betätigbares Ventil in Form eines Brennstoffeinspritzventils bekannt. Das innere Ventilrohr bildet das Grundgerüst des gesamten Einspritzventils und besitzt in seiner Gesamtheit aus den drei Einzelbauteilen eine wesentliche Stützfunktion. Das nichtmagnetische Zwischenteil ist durch Schweißnähte sowohl dicht und fest mit dem Einlassstutzen als auch mit dem Ventilsitzträger verbunden. Die Wicklungen einer Magnetspule sind in einem Spulenträger aus Kunststoff eingebracht, der wiederum in Umfangsrichtung einen Teil des als Innenpol dienenden Einlassstutzens und auch das Zwischenteil umgibt. In dem Ventilsitzträger ist eine axial bewegbare Ventilnadel angeordnet, die einen hülsenförmigen Anker und einen kugelförmigen Ventilschließkörper sowie ein den Anker mit dem Ventilschließkörper verbindendes Verbindungsrohr umfasst. Das Verbindungsrohr ist mittels Schweißnähten fest mit dem Anker und auch mit dem Ventilschließkörper verbunden. Der Ventilschließkörper wirkt mit einer kegelstumpfförmig verlaufenden Ventilsitzfläche eines metallenen Ventilsitzkörpers zusammen. Der Ventilsitzkörper ist mittels einer Schweißnaht fest mit dem Ventilsitzträger verbunden.From the DE 40 08 675 A1 Such an electromagnetically operable valve in the form of a fuel injection valve is already known. The inner valve tube forms the backbone of the entire injection valve and has in its entirety of the three individual components an essential support function. The non-magnetic intermediate part is connected by welds both tight and tight with the inlet port and with the valve seat carrier. The windings of a magnetic coil are introduced into a plastic coil bobbin, which in turn surrounds in the circumferential direction a part of the inlet port serving as inner pole and also the intermediate part. In the valve seat carrier, an axially movable valve needle is arranged, which comprises a sleeve-shaped armature and a spherical valve closing body and a connecting tube connecting the armature with the valve closing body. The Connecting pipe is firmly connected by means of welds with the armature and also with the valve closing body. The valve closing body cooperates with a frusto-conical valve seat surface of a metal valve seat body. The valve seat body is firmly connected by means of a weld with the valve seat carrier.

Aus der DE 195 03 224 A1 ist ein weiteres elektromagnetisch betätigbares Ventil in der Form eines Brennstoffeinspritzventils bekannt. Das Brennstoffeinspritzventil besitzt einen mit einem Ventilsitz zusammenwirkenden kugelförmigen Ventilschließkörper, der an einem Schließkörpernäger in Form eines Kunststoffrohres angebracht ist, während an dem dem Ventilschließkörper gegenüberliegenden Ende ein Anker an dem Kunststoffrohr befestigt ist. Zusammen bilden diese Bauteile eine axial bewegbare Ventilnadel. Das untere Ende des Kunststoffrohres ist kalottenförmig ausgebildet, wobei in der gewölbten Ausnehmung der Ventilschließkörper formschlüssig mittels einer Schnappverbindung festgehalten wird. Das Kunststoffrohr ist im Bereich der unteren Ausnehmung federelastisch ausgeführt, da Haltebacken den Ventilschließkörper umgreifen müssen. Der kugelförmige Ventilschließkörper kann aus Stahl, einer Keramik oder einem Kunststoff hergestellt sein. Der Ventilschließkötper wirkt mit einer kegelstumpfförmig verlaufenden Ventilsitzfläche eines metallenen Ventilsitzkörpers zusammen. Der Ventilsitzkörper ist mittels einer Schweißnaht fest mit dem Ventilsitzträger verbunden.From the DE 195 03 224 A1 For example, another electromagnetically operable valve in the form of a fuel injector is known. The fuel injection valve has a spherical valve closing body cooperating with a valve seat, which is attached to a closing body carrier in the form of a plastic tube, while at the opposite end of the valve closing body, an anchor is attached to the plastic tube. Together, these components form an axially movable valve needle. The lower end of the plastic tube is dome-shaped, wherein in the curved recess of the valve closing body is positively held by means of a snap connection. The plastic tube is designed to be resilient in the region of the lower recess, since holding jaws have to embrace the valve closing body. The spherical valve closing body may be made of steel, a ceramic or a plastic. The valve closing body cooperates with a frusto-conical valve seat surface of a metal valve seat body. The valve seat body is firmly connected by means of a weld with the valve seat carrier.

Aus der US 5,967,424 A ist bereits ein Brennstoffeinspritzventil, insbesondere für Brennstoffeinspritzanlagen von Brennkraftmaschinen bekannt, das einen Elektromagnetkreis als erregbaren, Aktuator aufweist. Mit dem Elektromagneten ist ein Betätigungsteil bewegbar, das einen Ventilschließkörper aufweist, der mit einem festen Ventilsitz zusammenwirkt, wobei der Ventilsitz an einem Ventilsitzkörper ausgeformt ist. Der Ventilsitzkörper ist fest und verliersicher mittels einer Schraubverbindung in einem Ventilsitzträger eingebracht. Die Schraubverbindung wird in bekannter Weise dadurch erzielt, dass das an dem Ventilsitzkörper ausgebildete Außengewinde mit einem Innengewinde an der inneren Wandung des Ventilsitzträgers korrespondiert. Das Außengewinde besitzt dabei in bekannter Weise nach radial außen stehende gewendelte Flanken.From the US 5,967,424 A is already a fuel injection valve, in particular for fuel injection systems of internal combustion engines known, which has an electromagnetic circuit as an excitable, actuator. With the electromagnet, an actuating part is movable, which has a valve closing body which cooperates with a fixed valve seat, wherein the valve seat is formed on a valve seat body. The valve seat body is firmly and captively inserted by means of a screw in a valve seat carrier. The screw connection is achieved in a known manner in that the external thread formed on the valve seat body corresponds with an internal thread on the inner wall of the valve seat carrier. The external thread has in a known manner radially outwardly standing coiled flanks.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, dass eine vereinfachte und kostengünstige Herstellung und automatische Montage des Ventils und insbesondere des Ventilsitzkörpers realisierbar ist, da auf stoffschlüssige Fügeverfahren, wie Schweißen, die den Nachteil eines Wärmeverzugs besitzen, und aufwändige formschlüssige Verbindungstechniken verzichtet werden kann. Vielmehr können besonders vorteilhafte Pressverbindungen zwischen einem metallenen Bauteilpartner und einem nichtmetallenen Bauteilpartner eingesetzt werden, die einfach und sehr sicher und zuverlässig anbringbar sind. Die erfindungsgemäße Anordnung hat zudem den Vorteil einer Reduktion des Körperschalls und damit der Geräuschentwicklung gegenüber bekannten Lösungen.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that a simplified and cost-effective production and automatic assembly of the valve and in particular of the valve seat body can be realized because of cohesive joining methods, such as welding, which have the disadvantage of heat distortion, and complex positive connection techniques can be waived. Rather, particularly advantageous press connections between a metal component partner and a non-metallic component partner can be used, which are simple and very safe and reliable attachable. The arrangement according to the invention also has the advantage of reducing the structure-borne noise and thus the noise development compared with known solutions.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim fuel injector are possible.

Besonders vorteilhaft ist es, den Ventilsitzkörper durch Einpressen in dem Ventilsitzträger zu befestigen. In vorteilhafter Weise ist dabei der Ventilsitzkörper aus einem keramischen Werkstoff hergestellt, wodurch die Masse des Brennstoffeinspritzventils reduziert werden kann. Zur weiteren Reduzierung der Masse des Brennstoffeinspritzventils ist der Ventilsitzträger aus einem Kunststoff gefertigt. Aus der verringerten Masse dieser Bauteile ergeben sich die Vorteile einer besseren Dynamik des Ventils und einer verringerten Geräuschentwicklung.It is particularly advantageous to fasten the valve seat body by pressing into the valve seat carrier. Advantageously, while the valve seat body is made of a ceramic material, whereby the mass of the fuel injection valve can be reduced. To further reduce the mass of the fuel injection valve, the valve seat carrier is made of a plastic. From the reduced mass of these components, there are the advantages of better dynamics of the valve and a reduced noise.

Die Kunststoff-Keramik-Pressverbindungen können besonders sicher und zuverlässig hergestellt werden, wenn in den Überlappungsbereichen von Ventilsitzkörper und Ventilsitzträger die sägezahnähnlichen Strukturen optimiert ausgebildet sind. Die sägezahnähnliche Struktur des Keramik-Bauteils Ventilsitzkörper dringt in den Kunststoff des Ventilsitzträgers ein, und der Kunststoff relaxiert nachfolgend.The plastic-ceramic press connections can be produced particularly reliably and reliably if the sawtooth-like structures are optimally formed in the overlapping areas of valve seat body and valve seat carrier. The sawtooth-like structure of the ceramic component valve seat body penetrates into the plastic of the valve seat carrier, and the plastic relaxes subsequently.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Brennstoffeinspritzventil in einer bekannten Ausführung gemäß dem Stand der Technik, Figur 2 ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils, Figur 3 einen Ventilsitzkörper in erfindungsgemäßer Ausführung und Figur 4 eine Draufsicht auf den Ventilsitzkörper gemäß Figur 3.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 a fuel injection valve in a known embodiment according to the prior art, FIG. 2 an embodiment of a fuel injection valve according to the invention, FIG. 3 a valve seat body in the inventive design and FIG. 4 a plan view of the valve seat body according to FIG. 3 ,

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist zum besseren Verständnis der Erfindung ein Brennstoffeinspritzventil in einer bekannten Ausführung gemäß dem Stand der Technik gezeigt. Das in der Figur 1 beispielsweise dargestellte elektromagnetisch betätigbare Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Brennstoffeinlassstutzen und Innenpol dienenden Kern 2, der beispielsweise hier rohrförmig ausgebildet ist und über seine gesamte Länge einen konstanten Außendurchmesser aufweist.In the FIG. 1 For the sake of better understanding of the invention, a fuel injection valve in a known embodiment according to the prior art is shown. That in the FIG. 1 For example, shown electromagnetically actuated valve in the form of an injector for fuel injection systems of mixture-compressing, spark-ignition internal combustion engines has a magnetic coil 1, serving as a fuel inlet nozzle and inner pole core 2, which is for example tubular here and over its entire length has a constant outer diameter.

Ein in radialer Richtung gestufter Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht in Verbindung mit dem Kern 2 einen kompakten Aufbau des Einspritzventils im Bereich der Magnetspule 1.A coil body 3 stepped in the radial direction accommodates a winding of the magnet coil 1 and, in conjunction with the core 2, enables a compact construction of the injection valve in the region of the magnet coil 1.

Mit einem unteren Kernende 9 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 10 dicht ein rohrförmiges metallenes nichtmagnetisches Zwischenteil 12 beispielsweise durch Schweißen verbunden und umgibt dabei das Kernende 9 teilweise axial. Der gestufte Spulenkörper 3 übergreift teilweise den Kern 2 und mit einer Stufe 15 größeren Durchmessers das Zwischenteil 12 zumindest teilweise axial. Stromabwärts des Spulenkörpers 3 und des Zwischenteils 12 erstreckt sich ein rohrförmiger Ventilsitzträger 16, der fest mit dem Zwischenteil 12 verbunden ist. In dem Ventilsitzträger 16 verläuft eine Längsbohrung 17, die konzentrisch zu der Ventillängsachse 10 ausgebildet ist. In der Längsbohrung 17 ist eine rohrförmige Ventilnadel 19 angeordnet, die an ihrem stromabwärtigen Ende 20 mit einem kugelförmigen Ventilschließkörper 21, an dessen Umfang beispielsweise fünf Abflachungen 22 zum Vorbeiströmen des Brennstoffs vorgesehen sind, beispielsweise durch Schweißen verbunden ist. Die Ventilnadel 19 stellt das bewegbare Betätigungsteil des Brennstoffeinspritzventils dar.With a lower core end 9 of the core 2 is concentric with a valve longitudinal axis 10 tightly connected to a tubular metal non-magnetic intermediate part 12, for example by welding and surrounds the core end 9 partially axially. The stepped bobbin 3 partially overlaps the core 2 and with a step 15 of larger diameter, the intermediate part 12 at least partially axially. Downstream of the bobbin 3 and the intermediate part 12 extends a tubular valve seat support 16 which is fixedly connected to the intermediate part 12. In the valve seat carrier 16 extends a longitudinal bore 17, which is formed concentrically to the valve longitudinal axis 10. In the longitudinal bore 17, a tubular valve needle 19 is arranged, which is provided at its downstream end 20 with a spherical valve closing body 21, on whose circumference, for example, five flats 22 are provided for flowing past the fuel, for example by welding. The valve needle 19 represents the movable actuating part of the fuel injection valve.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 19 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 25 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2 und einem Anker 27. Der Anker 27 ist mit dem dem Ventilschließkörper 21 abgewandten Ende der Ventilnadel 19 durch eine Schweißnaht 28 verbunden und auf den Kern 2 ausgerichtet. In das stromabwärts liegende, dem Kern 2 abgewandte Ende des Ventilsitzträgers 16 ist in der Längsbohrung 17 ein zylinderförmiger metallener Ventilsitzkörper 29, der einen festen Ventilsitz 30 aufweist, durch Schweißen dicht montiert.The actuation of the injection valve takes place in a known manner electromagnetically. For axial movement of the valve needle 19 and thus to open against the spring force of a return spring 25 and closing the injector is the electromagnetic circuit with the solenoid 1, the core 2 and an armature 27. The armature 27 is remote from the valve closing body 21 end of Valve needle 19 is connected by a weld 28 and aligned with the core 2. In the downstream, the core 2 remote from the end of the valve seat support 16 is in the longitudinal bore 17, a cylindrical metal valve seat body 29 having a fixed valve seat 30, mounted by welding tight.

Zur Führung des Ventilschließkörpers 21 während der Axialbewegung der Ventilnadel 19 mit dem Anker 27 entlang der Ventillängsachse 10 dient eine Führungsöffnung 32 des Ventilsitzkörpers 29. Der kugelförmige Ventilschließkörper 21 wirkt mit dem sich in Strömungsrichtung kegelstumpfförmig verjüngenden Ventilsitz des Ventilsitzkörpers 29 zusammen. An seiner dem Ventilschließkörper 21 abgewandten Stirnseite ist der Ventilsitzkörper 29 mit einer beispielsweise topfförmig ausgebildeten Spritzlochscheibe 34 konzentrisch und fest verbunden. Im Bodenteil der Spritzlochscheibe 34 verläuft wenigstens eine, beispielsweise verlaufen vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 39.For guiding the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the valve longitudinal axis 10 serves a guide opening 32 of the valve seat body 29. The spherical valve closing body 21 cooperates with the frusto-conical in the flow direction valve seat of the valve seat body 29. At its end facing away from the valve closing body 21, the valve seat body 29 is provided with an injection-molded perforated disc 34, for example in the shape of a pot concentric and firmly connected. In the bottom part of the spray perforated disk 34 extends at least one, for example, four formed by eroding or punching ejection openings 39th

Die Einschubtiefe des Ventilsitzkörpers 29 mit der topfförmigen Spritzlochscheibe 34 bestimmt die Voreinstellung des Hubs der Ventilnadel 19. Dabei ist die eine Endstellung der Ventilnadel 19 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkörpers 21 am Ventilsitz des Ventilsitzkörpers 29 festgelegt, während sich die andere Endstellung der Ventilnadel 19 bei erregter Magnetspule 1 durch die Anlage des Ankers 27 am Kernende 9 ergibt.The depth of insertion of the valve seat body 29 with the cup-shaped spray disk 34 determines the default setting of the stroke of the valve needle 19. The one end position of the valve needle 19 is fixed at non-energized solenoid 1 by the system of the valve closing body 21 on the valve seat of the valve seat body 29, while the other end position the valve needle 19 results in excited magnetic coil 1 by the system of the armature 27 at the core end 9.

Eine in eine konzentrisch zur Ventillängsachse 10 verlaufende Strömungsbohrung 46 des Kerns 2 eingeschobene Einstellhülse 48, die beispielsweise aus gerolltem Federstahlblech ausgeformt ist, dient zur Einstellung der Federvorspannung der an der Einstellhülse 48 anliegenden Rückstellfeder 25, die sich wiederum mit ihrer gegenüberliegenden Seite an der Ventilnadel 19 abstützt. Das Einspritzventil ist weitgehend mit einer Kunststoffumspritzung 50 umschlossen. Zu dieser Kunststoffumspritzung 50 gehört beispielsweise ein mitangespritzter elektrischer Anschlussstecker 52. Ein Brennstofffilter 61 ragt in die Strömungsbohrung 46 des Kerns 2 an dessen zulaufseitigem Ende 55 hinein und sorgt für die Herausfiltrierung solcher Brennstoffbestandteile, die aufgrund ihrer Größe im Einspritzventil Verstopfungen oder Beschädigungen verursachen könnten.An inserted into a concentric with the longitudinal axis of the valve 10 flow bore 46 of the core 2 inserted adjusting sleeve 48, which is formed for example of rolled spring steel, is used to adjust the spring bias of the adjusting sleeve 48 restoring spring 25, which in turn with its opposite side to the valve needle 19th supported. The injection valve is largely enclosed by a plastic extrusion coating 50. A plastic filter 61 protrudes into the flow bore 46 of the core 2 at its inlet end 55 and ensures the filtering out of such fuel constituents that could cause blockages or damage due to their size in the injection valve.

In der Figur 2 ist ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils gezeigt. Das Brennstoffeinspritzventil ist mit einem besonders einfachen und leichten Aufbau ausgeführt. Dazu sind mehrere Bauteile des Brennstoffeinspritzventils beispielsweise aus einem Kunststoff oder aus einem Keramikwerkstoff gefertigt, wodurch eine Massereduzierung des Brennstoffeinspritzventils ermöglicht ist. Während bei dem bekannten Brennstoffeinspritzventil gemäß Figur 1 ausschließlich die Kunststoffumspritzung 50 mit dem Anschlussstecker 52 sowie der Spulenkörper 3 aus einem Kunststoff ausgeführt sind, sind z.B. bei dem erfindungsgemäßen Ausführungsbeispiel noch die Bauteile Ventilsitzträger 16 und Ventilnadel 19 aus einem Kunststoff geformt. Von einer Kunststoffumspritzung des Brennstoffeinspritzventils im klassischen Sinne kann deshalb nicht mehr gesprochen werden, da mehrere der das Ventilgehäuse bildenden Bauteile selbst unmittelbar aus Kunststoff hergestellt sind. Ein Anschlussstutzen 51 aus Kunststoff bildet z.B. den Einströmkanal des Brennstoffeinspritzventils und nimmt dabei den Brennstofffilter 61 auf. Der Spulenkörper 3 ist z.B. dermaßen ausgebildet, dass aus ihm einteilig der elektrische Anschlussstecker 52 mit hervorgeht.In the FIG. 2 an embodiment of a fuel injection valve according to the invention is shown. The fuel injection valve is designed with a particularly simple and lightweight construction. For this purpose, a plurality of components of the fuel injection valve are made for example of a plastic or of a ceramic material, whereby a mass reduction of the fuel injection valve is made possible. While in the known fuel injection valve according to FIG. 1 Only the plastic extrusion coating 50 with the connector 52 and the bobbin 3 are made of a plastic, for example, in the embodiment of the invention, the components valve seat carrier 16 and valve needle 19 are formed from a plastic. From a plastic injection of the fuel injection valve in the classical sense can therefore no longer be spoken, as several of the valve housing forming components themselves are made directly from plastic. A plastic connecting piece 51 forms, for example, the inflow channel of the fuel injection valve and takes up the fuel filter 61. The bobbin 3 is for example, such that it integrally emerges from the electrical connector 52 with him.

Die Ventilnadel 19 besteht bei der gezeigten Ausführung aus drei Einzelkomponenten, die zusammen das Bauteil Ventilnadel 19 bilden. Der Anker 27, der z.B. als Drehteil ausgebildet ist, bildet dabei eine erste Einzelkomponente, während ein kugelförmiger Ventilschließkörper 21 eine zweite Einzelkomponente der Ventilnadel 19 darstellt. Ein den Anker 27 mit dem Ventilschließkörper 21 verbindendes Verbindungsrohr 23 stellt einen Schließkörperträger dar. Das Verbindungsrohr 23 ist z.B. mittels Kunststoffspritzgießen hergestellt und besitzt eine innere Längsöffnung, aus der mehrere Queröffnungen ausmünden. Die Queröffnungen können optional mit einem Siebgewebe 80 aus Kunststoff oder Metall versehen sein, das im Spritzgussprozess des Verbindungsrohrs 23 als Einlegeteil mit angebracht wird.The valve needle 19 consists in the embodiment shown of three individual components, which together form the component valve needle 19. The anchor 27, e.g. is formed as a rotating part, thereby forming a first individual component, while a spherical valve-closure member 21 is a second individual component of the valve needle 19. A connecting tube 23 connecting the armature 27 to the valve closing body 21 constitutes a closing body carrier. The connecting tube 23 is e.g. produced by plastic injection molding and has an inner longitudinal opening, from which open several transverse openings. The transverse openings may optionally be provided with a mesh fabric 80 made of plastic or metal, which is attached in the injection molding process of the connecting tube 23 as an insert.

Am dem Ventilschließkörper 21 zugewandten unteren Ende weist der Anker 27 eine sägezahnähnliche Struktur 63a mit einem "Tannenbaumprofil" auf. Diese Struktur 63a korrespondiert mit einem oberen aufgeweiteten Ende des Verbindungsrohres 23 aus Kunststoff. Zur Herstellung einer festen Verbindung zwischen dem Anker 27 und dem Verbindungsrohr 23 wird der Anker 27 mit seiner Struktur 63a in das Verbindungsrohr 23 eingepresst, und zwar in der Weise, dass sich die Struktur 63a fest, sicher und verdrehfixiert am Ende des Verbindungsrohrs 23 verhakt und verspreizt. Zur Aufnahme des Ventilschließkörpers 21 ist das Verbindungsrohr 23 mit einer gewölbten bzw. kalottenförmigen Ausnehmung 78 versehen. Die gewölbte Aufnahmefläche der Ausnehmung 78 weist idealerweise einen geringfügig kleineren Durchmesser auf als den Durchmesser des kugelförmigen Ventilschließkörpers 21, wodurch nach dem Anbringen des Ventilschließkörpers 21 unter Aufbringung einer geringen Kontaktkraft eine kraftschlüssige Verbindung zwischen dem Verbindungsrohr 23 und dem Ventilschließkörper 21 entsteht. Der Ventilschließkörper 21 wird über das Verbindungsrohr 23 beim Bestromen der Magnetspule 1 sicher, zuverlässig und reproduzierbar aus dem Ventilsitz 30 des Ventilsitzkörpers 29 gezogen, obwohl der Ventilschließkörper 21 "lose" an dem Verbindungsrohr 23 gehalten wird. Als Material für den als Vollkugel ausgebildeten Ventilschließkörper 21 bietet sich ein keramischer Werkstoff, z.B. Si3N4 an. Allerdings kann der Ventilschließkörper 21 metallisch oder keramisch oder aus einem Kunststoff sein.At the lower end facing the valve closing body 21, the armature 27 has a sawtooth-like structure 63a with a "Christmas tree profile". This structure 63a corresponds to an upper flared end of the connecting pipe 23 made of plastic. To establish a firm connection between the armature 27 and the connecting tube 23, the armature 27 is pressed with its structure 63 a in the connecting pipe 23, in such a way that the structure 63 a firmly, securely and rotationally fixed hooked at the end of the connecting pipe 23 and braced. For receiving the valve closing body 21, the connecting tube 23 is provided with a curved or dome-shaped recess 78. The arched receiving surface of the recess 78 ideally has a slightly smaller diameter than the diameter of the spherical valve closing body 21, whereby after attaching the valve closing body 21 by applying a low contact force, a frictional connection between the connecting pipe 23 and the valve closing body 21 is formed. The valve closing body 21 is pulled safely, reliably and reproducibly out of the valve seat 30 of the valve seat body 29 via the connecting tube 23 when the solenoid coil 1 is energized, although the valve closing body 21 is held "loosely" on the connecting tube 23. As a material for the designed as a solid ball valve closing body 21, a ceramic material, for example, Si 3 N 4 offers. However, the valve closing body 21 may be metallic or ceramic or made of a plastic.

Vergleichbar mit der am Anker 27 ausgebildeten sägezahnähnlichen Struktur 63a mit einem "Tannenbaumprofil" können zur Herstellung von sicheren Verbindungen zwischen Brennstoffeinspritzventilbauteilen aus Metall und Kunststoff weitere sägezahnähnliche Strukturen 63 vorgesehen sein. So weist der Kern 2 an seinen beiden axialen Enden jeweils eine sägezahnähnliche Struktur 63b, 63c auf, die dafür sorgt, dass bei eingepresstem Kern 2 sowohl eine sichere und zuverlässige feste Verbindung zum Anschlussstutzen 51 aus Kunststoff als auch zum Spulenkörper 3 aus Kunststoff gewährleistet ist. Zwei weitere sägezahnähnliche Strukturen 63d, 63e mit "Tannenbaumprofil" sind an einem metallenen, magnetisch leitenden Zwischenteil 13 vorgesehen, das unterhalb des Spulenkörpers 3 im axialen Erstreckungsbereich des Ankers 27 angeordnet ist. Dieses ringförmige Zwischenteil 13 ist z.B. im Profil T-formit ausgebildet, wobei zwei Schenkel des T-Profils die Strukturen 63d, 63e aufweisen und somit für eine feste sichere Verbindung mit dem Spulenkörper 3 und mit dem Ventilsitzträger 16 sorgen. Der dritte radial nach außen gerichtete Schenkel des T-Profils des Zwischenteils 13 ist mit einem ein äußeres Magnetbauteil darstellenden Magnettopf 14 verbunden, durch den der Magnetkreis geschlossen wird.Similar to the armature 27 formed sawtooth-like structure 63 a with a "fir tree profile" can for the production of secure connections between Fuel injection valve components made of metal and plastic further sawtooth-like structures 63 may be provided. Thus, the core 2 at its two axial ends in each case a sawtooth-like structure 63b, 63c, which ensures that when pressed core 2 both a secure and reliable solid connection to the connecting piece 51 made of plastic and the bobbin 3 made of plastic is ensured. Two further sawtooth-like structures 63d, 63e with "Christmas tree profile" are provided on a metal, magnetically conductive intermediate part 13, which is arranged below the bobbin 3 in the axial extension region of the armature 27. This annular intermediate part 13 is formed, for example, in profile T-form, wherein two legs of the T-profile, the structures 63 d, 63 e have and thus provide a firm secure connection to the bobbin 3 and the valve seat carrier 16. The third radially outwardly directed leg of the T-section of the intermediate part 13 is connected to a magnetic pot 14, which constitutes an outer magnet component and through which the magnetic circuit is closed.

Erfindungsgemäß ist in das untere Ende des aus Kunststoff bestehenden Ventilsitzträgers 16 der Ventilsitzkörper 29 eingesetzt, der aus einem Keramikwerkstoff besteht. Als Material für den Ventilsitzkörper 29 bietet sich der keramische Werkstoff Si3N4 an. Ein solcher Werkstoff besitzt nur ca. 1/3 der Masse eines vergleichbar großen Bauteils aus Stahl, wie er üblicherweise verwendet wird. Auch der Ventilsitzkörper 29 ist an seinem Außenumfang mit einer sägezahnähnlichen Struktur 63f ausgebildet, die als "Tannenbaumprofil" bezeichnet werden kann. Zur Herstellung einer festen Verbindung zwischen dem Ventilsitzkörper 29 und dem Ventilsitzträger 16 wird der Ventilsitzkörper 29 mit seiner Struktur 63f in den Ventilsitzträger 16 eingepresst, und zwar in der Weise, dass sich die Struktur 63f fest, sicher und verdrehfixiert am unteren Ende des Ventilsitztzträgers 16 verhakt und verspreizt. Die sägezahnähnliche Struktur 63f des Keramik-Bauteils Ventilsitzkörper 29 dringt also in den Kunststoff des Ventilsitzträgers 16 ein, und der Kunststoff relaxiert nachfolgend.According to the valve seat body 29 is inserted into the lower end of the existing plastic valve seat carrier 16, which consists of a ceramic material. As a material for the valve seat body 29, the ceramic material Si 3 N 4 offers. Such a material has only about 1/3 of the mass of a comparably large component made of steel, as it is commonly used. Also, the valve seat body 29 is formed on its outer periphery with a sawtooth-like structure 63 f, which may be referred to as a "Christmas Tree Profile". To establish a firm connection between the valve seat body 29 and the valve seat carrier 16, the valve seat body 29 is pressed with its structure 63 f in the valve seat carrier 16, in such a way that the structure 63 f hooked firmly, securely and rotationally fixed at the lower end of the Ventilitztitzträgers 16 and spreads. The sawtooth-like structure 63f of the ceramic component valve seat body 29 thus penetrates into the plastic of the valve seat carrier 16, and the plastic subsequently relaxes.

In der Figur 3 ist ein Ventilsitzkörper 29 als Einzelbauteil in vergrößerter Darstellung gezeigt. Dabei sind verschiedene Ausgestaltungsmöglichkeiten der sägezahnähnlichen Struktur 63f gemeinsam in Figur 3 dargestellt. Aus der Figur 3 ist zu erkennen, dass die Zahnform der Struktur 63f unmittelbar spitz zulaufend (Za), schräg und senkrecht mit Knick zulaufend (Zb) oder gewölbt zulaufend (Zc) oder in Kombinationen ausgebildet sein kann.In the FIG. 3 is a valve seat body 29 shown as a single component in an enlarged view. Different design possibilities of the saw-tooth-like structure 63f are common in FIG. 3 shown. From the FIG. 3 It can be seen that the tooth form of the structure 63f can be directly pointed (Za), obliquely and perpendicularly tapered (Zb) or curved (Zc) or formed in combinations.

Figur 4 ist eine Draufsicht auf den Ventilsitzkörper 29 gemäß Figur 3. Aus der Draufsicht wird deutlich, dass die Führungsöffnung 32 für die axial bewegliche Ventilnadel 19 mit dem Ventilschließkörper 21 mehrfach unterbrochen sein kann. Insofern bildet die Führungsöffnung 32 nur einzelne Führungsabschnitte, die alternierend mit durchmessergrößeren Strömungsnuten 33 umfangsmäßig ausgebildet sind. Durch die Strömungsnuten 33 kann der Brennstoff ungehindert in Richtung Ventilsitz 30 geleitet werden. Es kann auch nur eine Strömungsnut 33 vorgesehen sein. FIG. 4 is a plan view of the valve seat body 29 according to FIG. 3 , From the top view, it is clear that the guide opening 32 for the axially movable valve needle 19 may be interrupted several times with the valve closing body 21. In this respect, the guide opening 32 forms only individual guide sections, which are formed circumferentially alternately with larger diameter flow grooves 33. Through the flow grooves 33, the fuel can be passed freely in the direction of the valve seat 30. It can also be provided only a flow groove 33.

Der erregbare Aktuator des Brennstoffeinspritzventils als elektromagnetischer Kreis mit der Magnetspule 1, dem Kern 2, dem Zwischenteil 13, dem Magnettopf 14 und dem Anker 27 kann z.B. auch als piezoelektrischer oder magnetostriktiver Antrieb ausgeführt sein.The energizable actuator of the fuel injection valve as the electromagnetic circuit with the solenoid coil 1, the core 2, the intermediate part 13, the magnet pot 14 and the armature 27 may e.g. also be designed as a piezoelectric or magnetostrictive drive.

Claims (9)

  1. Fuel injection valve, in particular for fuel injection systems of internal combustion engines, having a valve longitudinal axis (10), having an excitable actuator (1, 2, 13, 14, 27), having a movable actuating part (19) which has a valve closing body (21) which interacts with a fixed valve seat (30), with the valve seat (30) being formed on a valve seat body (29), and having a valve seat carrier (16) into which the valve seat body (29) is inserted,
    characterized in that the valve seat body (29) has on its outer circumference a sawtooth-like structure (63f) for producing a fixed connection to the valve seat carrier (16), which sawtooth-like structure (63f) is such that the valve seat body (29) can be inserted into the valve seat carrier (16) by being pressed in.
  2. Fuel injection valve according to Claim 1,
    characterized in that the valve seat body (29) is composed of a ceramic material, in particular Si3N4.
  3. Fuel injection valve according to Claim 1 or 2,
    characterized in that the valve seat carrier (16) is produced from a plastic.
  4. Fuel injection valve according to one of the preceding claims, characterized in that the tooth shape of the structure (63f) is formed so as to taper directly to a tip (Za), so as to taper obliquely and vertically with a bend (Zb) or so as to taper in a curved fashion (Zc) or combinations of these.
  5. Fuel injection valve according to one of the preceding claims, characterized in that a guide opening (32) for the valve closing body (21) is provided in the valve seat body (29), which valve closing body (21) has at least one discontinuity as a flow groove (33).
  6. Fuel injection valve according to one of the preceding claims, characterized in that the valve closing body (21) is composed of a metallic or ceramic material.
  7. Fuel injection valve according to one of the preceding claims, characterized in that a connecting pipe (23), as part of a valve needle (19), constitutes an individual component composed of plastic, with the connecting pipe (23) connecting an armature (27) to the valve closing body (21).
  8. Fuel injection valve according to Claim 7,
    characterized in that a sawtooth-like structure (63a) is provided on the armature (27), which structure is pressed into the connecting pipe (23) in order to produce a fixed connection to the connecting pipe (23).
  9. Fuel injection valve according to one of the preceding claims, characterized in that the valve closing body (21) is held loosely and without auxiliary means on the connecting pipe (23) of the valve needle (19).
EP06807772A 2005-12-22 2006-11-08 Fuel injection valve Active EP1966484B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061424A DE102005061424A1 (en) 2005-12-22 2005-12-22 Fuel injection valve for internal combustion engine, has movable actuating part with valve seat body including saw-tooth structure at outer periphery to provide firm connection with valve seat carrier
PCT/EP2006/068216 WO2007073975A1 (en) 2005-12-22 2006-11-08 Fuel injection valve

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EP1966484A1 EP1966484A1 (en) 2008-09-10
EP1966484B1 true EP1966484B1 (en) 2010-06-23

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US (1) US20090301442A1 (en)
EP (1) EP1966484B1 (en)
JP (1) JP4909358B2 (en)
CN (1) CN101341330B (en)
DE (2) DE102005061424A1 (en)
WO (1) WO2007073975A1 (en)

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CN101341330A (en) 2009-01-07
JP4909358B2 (en) 2012-04-04
EP1966484A1 (en) 2008-09-10
DE502006007293D1 (en) 2010-08-05
WO2007073975A1 (en) 2007-07-05
CN101341330B (en) 2011-09-07
JP2009520149A (en) 2009-05-21
US20090301442A1 (en) 2009-12-10

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