EP1966482B1 - Plastic-metal connection - Google Patents

Plastic-metal connection Download PDF

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Publication number
EP1966482B1
EP1966482B1 EP06807642A EP06807642A EP1966482B1 EP 1966482 B1 EP1966482 B1 EP 1966482B1 EP 06807642 A EP06807642 A EP 06807642A EP 06807642 A EP06807642 A EP 06807642A EP 1966482 B1 EP1966482 B1 EP 1966482B1
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EP
European Patent Office
Prior art keywords
valve
plastic
valve seat
fuel injection
metal
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
EP06807642A
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German (de)
French (fr)
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EP1966482A1 (en
Inventor
Ferdinand Reiter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1966482A1 publication Critical patent/EP1966482A1/en
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Publication of EP1966482B1 publication Critical patent/EP1966482B1/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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8007—Storing data on fuel injection apparatus, e.g. by printing, by using bar codes or EPROMs
    • 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
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals

Definitions

  • the invention relates to a plastic-metal compound according to the preamble of claim 1.
  • 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.
  • a fuel injection valve in particular for fuel injection systems of internal combustion engines known, which has an electromagnetic circuit as an excitable actuator.
  • 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 fuel injection valve having the valve body has at least one metallic member having on its outer periphery a sawtooth-like structure in the form of a plurality of ribs for establishing a fixed connection with a corresponding plastic component.
  • the plastic part is a main body of an annular filter element, which is pushed captive onto the metal component (valve body).
  • the plastic-metal compound according to the invention with the features of claim 1 has the advantage that it is simple and inexpensive to produce and still an automatic assembly is guaranteed.
  • the plastic-metal press-fit connections can be produced in a particularly reliable and reliable manner by designing sawtooth-like structures at least on the metal component in the overlapping areas of the respective components to be connected.
  • the sawtooth-like structure of the metal component penetrates into the plastic of the corresponding component and deforms it elastically, whereby a relaxation of the plastic in the sawtooth-like structure takes place.
  • the inventive construction guarantees high security against loosening of the connection by pulling against the mounting direction and also offers a very high security against rotation, which is particularly desirable when the two corresponding components must remain in a certain rotational position to each other. In addition, a chip formation during assembly is excluded.
  • the plastic-metal press connections can be made particularly secure and reliable if, in the overlapping areas of the respective components to be connected, sawtooth-like structures are formed optimized at least on the metal component.
  • the sawtooth-like structure of the metal component penetrates into the plastic of the corresponding component and deforms it elastically, whereby a relaxation of the plastic in the sawtooth-like structure takes place.
  • This profiled area is designed as a knurl, which is formed by a plurality of parallel, distributed over the circumference of vertical or oblique grooves, grooves or Auf theoryfen. With this profiled area is ensured in an advantageous manner that the metal component positively, and absolutely secure against rotation in the sleeve-shaped plastic component is fixed. In this case, the profiled area can be provided at both ends of the saw-tooth-like structure of the metal component.
  • FIG. 1 a fuel injection valve in a known embodiment according to the prior art
  • FIG. 2 An embodiment of a fuel injection valve with a plurality of solid plastic-metal connections between each two components of the fuel injection valve
  • FIG. 3 A first embodiment of a plastic-metal compound in a detailed view
  • FIG. 4 a second further embodiment of a plastic-metal compound
  • FIG. 5 a third further embodiment of a plastic-metal compound.
  • 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 concentrically and firmly connected to an injection-molded perforated disk 34, for example of cup shape.
  • injection-molded perforated disk 34 for example of cup shape.
  • 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 Another example of a fuel injector 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, so designed that it integrally emerges from the electrical connector 52 with.
  • 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 into 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 63a Comparable with the sawtooth-like structure 63a with a "Christmas tree profile" formed on the armature 27, further sawtooth-like structures 63 may be provided to produce secure connections between fuel injection valve components made of metal and plastic.
  • 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-shaped, wherein two legs of the T-profile, the structures 63 d, 63 e 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.
  • the inner walls of the bobbin 3 and the valve seat carrier 16 are formed with a slightly offset, largely flat surface. These surfaces of the bobbin 3 and the valve seat carrier 16 correspond to the sawtooth-like structure 63d, 63e on the intermediate part 13.
  • the intermediate part 13 is pressed into these components for the purpose of making firm connections with the bobbin 3 and the valve seat carrier 16, in such a way that that the structure 63d, 63e firmly and securely locked and fixed in rotation on the surfaces of the bobbin 3 and the valve seat support 16 and spreads.
  • the press-in depth of the intermediate part 13 can be set in these components, where the intermediate part 13 then rests in the pressed state.
  • the guide of the axially movable armature 27 takes place, for example, in the inner opening 66 of the intermediate part 13.
  • valve seat body 29 In the lower end of the plastic valve seat carrier 16, the valve seat body 29 is inserted, which consists of a metal or 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 valve seat carrier 16 and spreads.
  • the sawtooth-like structure 63f of the valve seat body 29 thus penetrates into the plastic of the valve seat carrier 16 and deforms it elastically, whereby a relaxation of the plastic into the sawtooth-like structure 63f takes place.
  • plastic-metal compound are each shown in a detailed view. These connection areas can be provided at any point in the fuel injection valve, at which components made of plastic and metal to a fixed connection with each other.
  • plastic-metal compounds which are characterized solely by their sawtooth-like structure 63, have in the FIGS. 3 and 4 shown plastic-metal compounds on another profiled area 70.
  • This profiled area 70 is designed, for example, as knurling, which is characterized by a plurality of parallel, distributed over the circumference of vertical or oblique grooves, grooves or Aufalismfen is formed.
  • the profiled region 70 it is advantageously ensured that the metal component is fixed positively and absolutely secure against rotation in the sleeve-shaped plastic component.
  • the profiled area 70 may be provided at both ends of the sawtooth-like structure 63 of the metal component, as the FIGS. 3 and 4 clarify.
  • FIG. 5 a non-inventive example of a plastic-metal compound is shown in a detailed view.
  • the sawtooth-like structure 63 is interrupted again and again by cylindrical sections 73.
  • Such a structure 63 with intervening sections 73 may also be additionally provided according to the invention with a profiled area 70.
  • the tooth form of the sawtooth-like structures 63 may be directly tapered, tapered and tapered or tapered, tapered or formed in combinations.
  • the saw-tooth-like structure 63 is each formed by a plurality of circumferential teeth, which are formed sequentially. In particular, 2 to 15 circumferential teeth are provided in a structure 63.
  • the structure 63 may be sharp-edged or smoothly tapering (FIG. FIG. 5 ).
  • 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)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

The invention relates to a fuel injection valve, especially for fuel injection systems of internal combustion engines. Said valve is characterized by a magnetic circuit comprising a core (2), a solenoid (1), an armature (27), and a mobile valve needle (19) having a valve closing element (21) that interacts with a stationary valve seat (30), said valve seat (30) being formed on a valve seat element (29), and a valve seat support (16) into which the valve seat element (29) is introduced. The outer periphery of at least one metal component of the fuel injection valve has a serrated structure (63a-f) for establishing a solid connection to a corresponding plastic component. The connecting piece (51), the valve seat support (16), the coil body (3) and a connecting tube (23) of the valve needle (19) can be made of plastic. The fuel injection valve is especially suitable for use in fuel injection systems of mixture-compressing spark ignition engines.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kunststoff-Metall-Verbindung nach der Gattung des Anspruchs 1 .The invention relates to a plastic-metal compound according to the preamble of claim 1.

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 Schließkörperträger 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 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 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 DE 10 2004 010 174 A1 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. Außerdem besitzt das Brennstoffeinspritzventil mit dem Ventilkörper wenigstens ein metallenes Bauteil, das an seinem äußeren Umfang eine sägezahnähnliche Struktur in Form von mehreren Rippen zur Herstellung einer festen Verbindung mit einem korrespondierenden Bauteil aus Kunststoff aufweist. Bei dem Kunststoffteil handelt es sich hier um einen Grundkörper eines ringförmigen Filterelements, der auf das metallene Bauteil (Ventilkörper) verliersicher aufgeschoben ist.From the DE 10 2004 010 174 A1 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. In addition, the fuel injection valve having the valve body has at least one metallic member having on its outer periphery a sawtooth-like structure in the form of a plurality of ribs for establishing a fixed connection with a corresponding plastic component. The plastic part is a main body of an annular filter element, which is pushed captive onto the metal component (valve body).

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kunststoff-Metall-Verbindung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass sie einfach und kostengünstig herstellbar ist und trotzdem eine automatische Montage gewährleistet ist. Die Kunststoff-Metall-Pressverbindungen können besonders sicher und zuverlässig dadurch hergestellt werden, dass in den Überlappungsbereichen der jeweils zu verbindenden Bauteile sägezahnähnliche Strukturen zumindest an dem metallenen Bauteil optimiert ausgebildet sind. Die sägezahnähnliche Struktur des metallenen Bauteils dringt in den Kunststoff des korrespondierenden Bauteils ein und verformt dieses elastisch, wodurch eine Relaxation des Kunststoffs in die sägezahnähnliche Struktur hinein erfolgt. Die erfindungsgemäße Ausbildung garantiert eine hohe Sicherheit gegen ein Lösen der Verbindung durch Ausziehen gegen die Montagerichtung und bietet zudem eine sehr hohe Verdrehsicherheit, die besonders wünschenswert ist, wenn die beiden korrespondierenden Bauteile in einer bestimmten Drehlage zueinander verbleiben müssen. Zudem ist eine Spanbildung bei der Montage ausgeschlossen.The plastic-metal compound according to the invention with the features of claim 1 has the advantage that it is simple and inexpensive to produce and still an automatic assembly is guaranteed. The plastic-metal press-fit connections can be produced in a particularly reliable and reliable manner by designing sawtooth-like structures at least on the metal component in the overlapping areas of the respective components to be connected. The sawtooth-like structure of the metal component penetrates into the plastic of the corresponding component and deforms it elastically, whereby a relaxation of the plastic in the sawtooth-like structure takes place. The inventive construction guarantees high security against loosening of the connection by pulling against the mounting direction and also offers a very high security against rotation, which is particularly desirable when the two corresponding components must remain in a certain rotational position to each other. In addition, a chip formation during assembly is excluded.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Kunststoff-Metall-Verbindung möglich.The measures listed in the dependent claims advantageous refinements and improvements of claim 1 plastic-metal compound are possible.

Die Kunststoff-Metall-Pressverbindungen können besonders sicher und zuverlässig hergestellt werden, wenn in den Überlappungsbereichen der jeweils zu verbindenden Bauteile sägezahnähnliche Strukturen zumindest an dem metallenen Bauteil optimiert ausgebildet sind. Die sägezahnähnliche Struktur des metallenen Bauteils dringt in den Kunststoff des korrespondierenden Bauteils ein und verformt dieses elastisch, wodurch eine Relaxation des Kunststoffs in die sägezahnähnliche Struktur hinein erfolgt.The plastic-metal press connections can be made particularly secure and reliable if, in the overlapping areas of the respective components to be connected, sawtooth-like structures are formed optimized at least on the metal component. The sawtooth-like structure of the metal component penetrates into the plastic of the corresponding component and deforms it elastically, whereby a relaxation of the plastic in the sawtooth-like structure takes place.

Vorteilhaft ist es zudem, an der sägezahnähnlichen Struktur einen weiteren profilierten Bereich auszubilden. Dieser profilierte Bereich ist als Rändelung ausgeführt, die durch eine Vielzahl von parallelen, über den Umfang verteilten senkrechten oder schrägen Rillen, Riefen oder Aufwürfen gebildet ist. Mit diesem profilierten Bereich wird in vorteilhafter Weise sichergestellt, dass das Metallbauteil formschlüssig, und absolut verdrehsicher in dem hülsenförmigen Kunststoffbauteil fixiert ist. Dabei kann der profilierte Bereich an beiden Enden der sägezahnähnlichen Struktur des metallenen Bauteils vorgesehen sein.It is also advantageous to form on the sawtooth-like structure another profiled area. This profiled area is designed as a knurl, which is formed by a plurality of parallel, distributed over the circumference of vertical or oblique grooves, grooves or Aufwürfen. With this profiled area is ensured in an advantageous manner that the metal component positively, and absolutely secure against rotation in the sleeve-shaped plastic component is fixed. In this case, the profiled area can be provided at both ends of the saw-tooth-like structure of the metal component.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind 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 Brennstoffeinspritzventils mit einer Vielzahl von festen Kunststoff-Metall-Verbindungen zwischen jeweils zwei Bauteilen des Brennstoffeinspritzventils, Figur 3 ein erstes Ausführungsbeispiel einer Kunststoff-Metall-Verbindung in einer Detailansicht, Figur 4 ein zweites weiteres Ausführungsbeispiel einer Kunststoff-Metall-Verbindung und Figur 5 ein drittes weiteres Ausführungsbeispiel einer Kunststoff-Metall-Verbindung.Embodiments of the invention are shown in simplified form in the drawings 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 with a plurality of solid plastic-metal connections between each two components of the fuel injection valve, FIG. 3 A first embodiment of a plastic-metal compound in a detailed view, FIG. 4 a second further embodiment of a plastic-metal compound and FIG. 5 a third further embodiment of a plastic-metal compound.

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. 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.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. 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 is 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 concentrically and firmly connected to an injection-molded perforated disk 34, for example of cup shape. 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 weiteres Beispiel eines 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 weiteren Beispiel 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 Another example of a fuel injector 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 50 with the connector 52 and the bobbin 3 are made of a plastic, for example, in the further example, 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, so designed that it integrally emerges from the electrical connector 52 with.

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 pipe 23, the armature 27 is pressed with its structure 63 a into 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. Durch das Einpressen des Kerns 2 in den Anschlussstutzen 51 und den Spulenkörper 3 dringt die sägezahnähnliche Struktur 63b, 63c des metallischen Bauteils Kern 2 in den Kunststoff des jeweils korrespondierenden Fügepartners ein, und der Kunststoff relaxiert nachfolgend, so dass eine sichere und zuverlässige feste Verbindung zwischen diesen Bauteilen gewährleistet ist.Comparable with the sawtooth-like structure 63a with a "Christmas tree profile" formed on the armature 27, further sawtooth-like structures 63 may be provided to produce secure connections between fuel injection valve components made of metal and plastic. 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. By pressing the core 2 into the connecting piece 51 and the bobbin 3 penetrates the sawtooth-like structure 63 b, 63 c of the metallic component core 2 in the plastic of the corresponding joining partner, and the plastic relaxes below, so that a secure and reliable solid connection between This component is guaranteed.

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-förmig 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. Zumindest in einem gewissen Überlappungsbereich von Zwischenteil 13 und Spulenkörper 3 bzw. Ventilsitzträger 16 sind die inneren Wandungen des Spulenkörpers 3 und des Ventilsitzträgers 16 mit einer etwas versetzten, weitgehend ebenen Oberfläche ausgeformt. Diese Oberflächen des Spulenkörpers 3 und des Ventilsitzträgers 16 korrespondieren mit der sägezahnähnlich ausgelegten Struktur 63d, 63e am Zwischenteil 13. Das Zwischenteil 13 wird zur Herstellung von festen Verbindungen mit dem Spulenkörper 3 und dem Ventilsitzträger 16 in diese Bauteile eingepresst, und zwar in der Weise, dass sich die Struktur 63d, 63e fest, sicher und verdrehfixiert an den Oberflächen des Spulenkörpers 3 und des Ventilsitzträgers 16 verhakt und verspreizt. Durch entsprechende Absätze 64, 65 am Spulenkörper 3 und Ventilsitzträger 16 kann die Einpresstiefe des Zwischenteils 13 in diese Bauteile festgelegt werden, an denen das Zwischenteil 13 im eingepressten Zustand dann anliegt. Die Führung des axial beweglichen Ankers 27 erfolgt z.B. in der Innenöffnung 66 des Zwischenteils 13.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-shaped, wherein two legs of the T-profile, the structures 63 d, 63 e 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. At least in a certain overlap region of the intermediate part 13 and bobbin 3 or valve seat carrier 16, the inner walls of the bobbin 3 and the valve seat carrier 16 are formed with a slightly offset, largely flat surface. These surfaces of the bobbin 3 and the valve seat carrier 16 correspond to the sawtooth-like structure 63d, 63e on the intermediate part 13. The intermediate part 13 is pressed into these components for the purpose of making firm connections with the bobbin 3 and the valve seat carrier 16, in such a way that that the structure 63d, 63e firmly and securely locked and fixed in rotation on the surfaces of the bobbin 3 and the valve seat support 16 and spreads. By appropriate paragraphs 64, 65 on the bobbin 3 and valve seat support 16, the press-in depth of the intermediate part 13 can be set in these components, where the intermediate part 13 then rests in the pressed state. The guide of the axially movable armature 27 takes place, for example, in the inner opening 66 of the intermediate part 13.

In das untere Ende des aus Kunststoff bestehenden Ventilsitzträgers 16 ist der Ventilsitzkörper 29 eingesetzt, der aus einem Metall- oder 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 Ventilsitzträgers 16 verhakt und verspreizt. Die sägezahnähnliche Struktur 63f des Ventilsitzkörpers 29 dringt also in den Kunststoff des Ventilsitzträgers 16 ein und verformt diesen elastisch, wodurch eine Relaxation des Kunststoffs in die sägezahnähnliche Struktur 63f hinein erfolgt.In the lower end of the plastic valve seat carrier 16, the valve seat body 29 is inserted, which consists of a metal or 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 valve seat carrier 16 and spreads. The sawtooth-like structure 63f of the valve seat body 29 thus penetrates into the plastic of the valve seat carrier 16 and deforms it elastically, whereby a relaxation of the plastic into the sawtooth-like structure 63f takes place.

In den Figuren 3 und 4 sind Ausführungsbeispiele einer Kunststoff-Metall-Verbindung jeweils in einer Detailansicht gezeigt. Diese Verbindungsbereiche können an beliebigen Stellen im Brennstoffeinspritzventil vorgesehen sein, an denen Bauteile aus Kunststoff und Metall zu einer festen Verbindung miteinander korrespondieren. Zusätzlich zu den bereits in der Figur 2 angedeuteten Kunststoff-Metall-Verbindungen, die sich ausschließlich durch ihre sägezahnähnliche Struktur 63 auszeichnen, weisen die in den Figuren 3 und 4 dargestellten Kunststoff-Metall-Verbindungen einen weiteren profilierten Bereich 70 auf. Dieser profilierte Bereich 70 ist z.B. als Rändelung ausgeführt, die durch eine Vielzahl von parallelen, über den Umfang verteilten senkrechten oder schrägen Rillen, Riefen oder Aufwürfen gebildet ist. Mit diesem profilierten Bereich 70 wird in vorteilhafter Weise sichergestellt, dass das Metallbauteil formschlüssig und absolut verdrehsicher in dem hülsenförmigen Kunststoffbauteil fixiert ist. Dabei kann der profilierte Bereich 70 an beiden Enden der sägezahnähnlichen Struktur 63 des metallenen Bauteils vorgesehen sein, wie die Figuren 3 und 4 verdeutlichen.In the FIGS. 3 and 4 Embodiments of a plastic-metal compound are each shown in a detailed view. These connection areas can be provided at any point in the fuel injection valve, at which components made of plastic and metal to a fixed connection with each other. In addition to those already in the FIG. 2 indicated plastic-metal compounds, which are characterized solely by their sawtooth-like structure 63, have in the FIGS. 3 and 4 shown plastic-metal compounds on another profiled area 70. This profiled area 70 is designed, for example, as knurling, which is characterized by a plurality of parallel, distributed over the circumference of vertical or oblique grooves, grooves or Aufwürfen is formed. With this profiled region 70 it is advantageously ensured that the metal component is fixed positively and absolutely secure against rotation in the sleeve-shaped plastic component. In this case, the profiled area 70 may be provided at both ends of the sawtooth-like structure 63 of the metal component, as the FIGS. 3 and 4 clarify.

In der Figur 5 ist ein nicht erfindungsgemäßes Beispiel einer Kunststoff-Metall-Verbindung in einer Detailansicht dargestellt. Die sägezahnähnliche Struktur 63 ist dabei immer wieder durch zylindrische Abschnitte 73 unterbrochen. Eine solche Struktur 63 mit dazwischen liegenden Abschnitten 73 kann ebenso zusätzlich erfindungsgemäß mit einem profilierten Bereich 70 versehen sein.In the FIG. 5 a non-inventive example of a plastic-metal compound is shown in a detailed view. The sawtooth-like structure 63 is interrupted again and again by cylindrical sections 73. Such a structure 63 with intervening sections 73 may also be additionally provided according to the invention with a profiled area 70.

Die Zahnform der sägezahnähnlichen Strukturen 63 kann unmittelbar spitz zulaufend, schräg und senkrecht mit Knick zulaufend oder gewölbt zulaufend oder in Kombinationen ausgebildet sein. Die sägezahnähnliche Struktur 63 wird jeweils von mehreren umlaufenden Zähnen gebildet, die aufeinanderfolgend ausgebildet sind. Insbesondere sind 2 bis 15 umlaufende Zähne bei einer Struktur 63 vorgesehen.The tooth form of the sawtooth-like structures 63 may be directly tapered, tapered and tapered or tapered, tapered or formed in combinations. The saw-tooth-like structure 63 is each formed by a plurality of circumferential teeth, which are formed sequentially. In particular, 2 to 15 circumferential teeth are provided in a structure 63.

Zum jeweiligen zylindrischen Abschnitt 73 hin kann die Struktur 63 scharfkantig oder sanft auslaufend ausgebildet sein (Figur 5).For the respective cylindrical portion 73, the structure 63 may be sharp-edged or smoothly tapering (FIG. FIG. 5 ).

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 (5)

  1. Plastic-metal connection between a metal component and a component made of a plastic, wherein the metal component corresponds to the component made of the plastic for the formation of a secure, fixed connection and the metal component is pressed into the component made of plastic, wherein a serrated structure (63) is provided at least on the metal component in the overlapping region with the component made of plastic,
    characterized
    in that a further, profiled region (70) is formed on the serrated structure (63) and this profiled region (70) is embodied as knurling which is formed by a multiplicity of parallel perpendicular or inclined grooves, furrows or ridges distributed over the circumference on at least one of the two ends of the structure (63).
  2. Plastic-metal connection according to Claim 1,
    characterized in that a plurality of circumferential teeth successively form the structure (63).
  3. Plastic-metal connection according to Claim 2,
    characterized in that 2 to 15 circumferential teeth form the structure (63).
  4. Plastic-metal connection according to one of the preceding claims,
    characterized in that the serrated structure (63) is interrupted by cylindrical portions (73) between the teeth.
  5. Plastic-metal connection according to one of the preceding claims,
    characterized in that the tooth shape of the serrated structure (63) is formed so as to taper directly to a tip, so as to taper obliquely and perpendicularly with a bend or so as to taper in a curved manner or in combinations of these.
EP06807642A 2005-12-22 2006-10-30 Plastic-metal connection Active EP1966482B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061408A DE102005061408A1 (en) 2005-12-22 2005-12-22 Combined plastic and metal component e.g. automotive fuel injection valve has serrated metal edge to plastic interface
PCT/EP2006/067909 WO2007073963A1 (en) 2005-12-22 2006-10-30 Plastic-metal connection and fuel injection valve comprising a plastic-metal connection

Publications (2)

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EP1966482A1 EP1966482A1 (en) 2008-09-10
EP1966482B1 true EP1966482B1 (en) 2011-03-16

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JP (1) JP5334589B2 (en)
CN (2) CN101346543B (en)
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WO (1) WO2007073963A1 (en)

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JP5334589B2 (en) 2013-11-06
WO2007073963A1 (en) 2007-07-05
DE102005061408A1 (en) 2007-06-28
CN101346543A (en) 2009-01-14
US20090179090A1 (en) 2009-07-16
CN101346543B (en) 2012-07-04
JP2009520171A (en) 2009-05-21
CN102383994B (en) 2015-04-29
US20120318892A1 (en) 2012-12-20
CN102383994A (en) 2012-03-21
EP1966482A1 (en) 2008-09-10
US8596562B2 (en) 2013-12-03
DE502006009127D1 (en) 2011-04-28
US8287007B2 (en) 2012-10-16

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