EP0865574A1 - Fuel injection valve and method of producing the same - Google Patents

Fuel injection valve and method of producing the same

Info

Publication number
EP0865574A1
EP0865574A1 EP97923728A EP97923728A EP0865574A1 EP 0865574 A1 EP0865574 A1 EP 0865574A1 EP 97923728 A EP97923728 A EP 97923728A EP 97923728 A EP97923728 A EP 97923728A EP 0865574 A1 EP0865574 A1 EP 0865574A1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
injection valve
sleeve
plastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97923728A
Other languages
German (de)
French (fr)
Other versions
EP0865574B1 (en
Inventor
Stefan Maier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0865574A1 publication Critical patent/EP0865574A1/en
Application granted granted Critical
Publication of EP0865574B1 publication Critical patent/EP0865574B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1 and a method for producing a fuel injection valve according to the preamble of claim 10.
  • This inner valve part is ultimately surrounded by a plurality of further individual components in the assembled state of the injection valve, at least one cup-shaped housing part, a magnet coil with coil body, a cup-shaped coil housing and a plug part being required.
  • the arrangement and design of the many individual parts surrounding the valve part is relatively complex.
  • a large number of connections must be made between the outer individual parts and the inner valve part.
  • a fuel injector which has a non-magnetic thin-walled sleeve as a valve seat support.
  • the entire, completely set fuel injector, including the sleeve, is largely enclosed with a plastic extrusion coating, which extends from the core in the axial direction over the solenoid coil to the downstream end of the injection valve.
  • the deep-drawn sleeve has only a very small wall thickness ( ⁇ 0.3 mm) in order to conduct the magnetic flux over the non-magnetic sleeve with as little loss as possible.
  • high encapsulation pressures up to 350 bar
  • are required which can lead to deformation of the sleeve, which can lead to assembly and functional problems of the injection valve.
  • the fuel injector according to the invention with the characterizing features of claim 1 has the advantage that it can be assembled inexpensively in a simple manner.
  • this simplified assembly of the fuel injector is achieved in that two main components of the injector, a valve part and a plastic part, are manufactured and adjusted separately from one another.
  • the inner valve part is advantageously carried out, inter alia, with a non-magnetic, thin-walled sleeve, the use of which brings cost savings compared to known valves, since material savings are possible and the joining for connecting individual components can be partially dispensed with.
  • the outer plastic part has an inner through opening into which the valve part can be inserted very easily and can be fastened by a simple but nevertheless secure snap-in connection.
  • the latching connection is advantageously produced by engaging, latching or clipping a latching element on the plastic part into a groove on the outer circumference of the valve part.
  • the locking elements can have a wide variety of contours, z. B. be angular or rounded.
  • FIG. 1 shows a fuel injection valve according to the invention
  • FIG. 2 shows an outer tubular plastic part
  • FIG. 3 shows an inner valve part, the parts of FIGS. 2 and 3 being assembled and connected to one another result in a fuel injection valve according to FIG. 1.
  • the electromagnetically actuated valve for example shown in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2, which is surrounded by a magnet coil 1 and serves as a fuel inlet port and enables m connection with the core 2 a particularly compact structure of the injection valve in the area of the magnet coil 1.
  • the magnet coil 1 is surrounded with its coil body 3 by at least one guiding element 5, for example designed as a bracket and serving as a ferromagnetic element, which surrounds the magnet coil 1 at least in the circumferential direction partially surrounds and abuts the core 2 with its upper end 6.
  • the at least one guide element 5 is designed in steps such that an axially parallel main section 7 and the upper end 6 are connected by a radially extending connecting section 8.
  • the connecting section 8 represents a cover of the magnetic coil area upwards.
  • the guide element 5 is at its lower end 9 z. B. connected to a cross-sectionally L-shaped guide ring 9, for example by one or more welding spots, which represents the boundary of the magnetic coil region downwards or in the downstream direction.
  • the parts of the guide element 5 and guide ring 10 which conduct the magnetic flux enclose the magnet coil 1, which is wound onto the coil body 3, at least in part in a pot shape.
  • the upper end of the core 2 is concentrically sealed to a valve longitudinal axis 16 as a
  • the coil former 3 overlaps the sleeve section 19 of the sleeve 18 at least partially axially.
  • the coil body 3 has namely over its entire axial extent a larger inner diameter than the diameter of the sleeve 18 in its upper sleeve section 19.
  • the tubular sleeve 18 made of, for example, non-magnetic steel extends downstream with a lower sleeve section 20 to the downstream end of the fuel injector, the lower sleeve section 20 has a slightly smaller diameter than the diameter of the upper sleeve section 19.
  • the diameter reduction in the form of a small shoulder 23 is located in the area of the upper end of the guide ring 10, since the guide ring 10 has a minimally smaller inside diameter than the inside diameter of the coil body 3. This configuration contributes to the safe assembly of the injection valve, which will be described in detail later.
  • the sleeve 18 is thus tubular over its entire axial length.
  • the sleeve 18 forms a through-opening 21 with a largely constant diameter apart from the shoulder 23 over its entire axial extent, which runs concentrically to the valve longitudinal axis 16.
  • the sleeve 18 surrounds an armature 24 and further downstream a valve seat body 25.
  • a valve seat body 25 which is fixedly connected to the valve seat body 25 on its downstream end face, for.
  • pot-shaped Sp ⁇ tz perforated disk 26 is also surrounded by the sleeve 18 in the circumferential direction, the fixed connection of the valve seat body 25 and spray perforated disk 26 z.
  • the sleeve 18 is thus not only a connecting part, but it also fulfills holding or carrying functions, in particular for the valve seat body 25, so that the sleeve 18 is really also a valve seat support.
  • In the passage opening 21 is a z. B. tubular valve needle 28 arranged at its downstream, the spray hole 26 facing end 29 with a z. B. spherical valve closing body 30, on the circumference of which, for example, five flattenings 31 are provided for the fuel to be sprayed to flow past, for example connected by welding.
  • the injection valve is actuated electromagnetically in a known manner.
  • a return spring 33 or closing the injection valve serves the electromagnetic circuit with the magnet coil 1, the core 2, the at least one guide element 5, the guide ring 10 and the armature 24.
  • the armature 24 is connected to the end of the valve needle 28 facing away from the valve closing body 30, for . B. connected by a weld and aligned to the core 2.
  • a guide opening 34 of the valve seat body 25 serves to guide the valve closing body 30 during the axial movement of the valve needle 28 with the armature 24 along the valve longitudinal axis 16.
  • the armature 24 is guided in the sleeve 18 during the axial movement.
  • the spherical valve closing body 30 acts with a conical taper in the flow direction
  • Valve seat surface 35 of the valve seat body 25 together, which is formed in the axial direction downstream of the guide opening 34.
  • the pot-shaped spray perforated disk 26 has a circumferential, downstream holding edge 43.
  • the holding edge 43 is conically bent outwards downstream , so that it bears against the inner wall of the sleeve 18, which is determined by the through opening 21, a radial pressure being present.
  • the holding edge 43 of the spray disk 26 with the wall of the sleeve 18 is, for example, by a circumferential and dense z.
  • valve needle 28 The end position of the valve needle 28 when the solenoid coil 1 is not excited is due to the valve closing body 30 resting on the valve seat surface 35 of the valve seat body 25 fixed, while the other end position of the valve needle 28 results when the magnet coil 1 is excited by the contact of the armature 24 at the core end 15.
  • the stroke adjustment takes place by the axial displacement of the core 2 pressed in with a slight oversize in the upper sleeve section 19 of the sleeve 18.
  • the core 2 is subsequently firmly connected to the sleeve 18 in the desired position, with laser welding on the circumference of the sleeve 18 makes sense.
  • the interference fit of the press fit can also be chosen to be sufficiently large so that the forces which arise can be absorbed and complete tightness is guaranteed, as a result of which welding can be omitted.
  • An adjusting sleeve 39 is inserted into a stepped flow bore 38 of the core 2, which runs concentrically to the longitudinal valve axis 16 and serves to supply the fuel in the direction of the valve seat, especially the valve seat surface 35.
  • the adjusting sleeve 39 is used to adjust the spring preload of the return spring 33 abutting the adjusting sleeve 39, which in turn is supported on the valve needle 28 with its opposite side.
  • a fuel filter 40 protrudes into the flow bore 38 of the core 2 at its inlet end and ensures that
  • the completely set and assembled injection valve is largely surrounded by a plastic jacket 50, which extends from the core 2 in the axial direction via the magnetic coil 1 to the immediate termination of the sleeve 18, with this plastic jacket 50 having a co-molded electrical connector 51. About the electrical connector 51, the electrical contact generation of the solenoid 1 and thus their excitation.
  • the plastic jacket 50 is a tubular plastic rope, which differs considerably from plastic fuel injection valves of known fuel injection valves.
  • FIG. 2 shows an outer tubular plastic part 60 with the magnetic coil assembly, which is mainly formed by the plastic jacket 50 with the connector 51.
  • This plastic part 60 consists specifically of the magnet coil 1, the coil body 3 carrying the windings of the magnet coil 1 made of plastic, the at least one z.
  • the tubular plastic jacket 50 includes the conventionally designed connector 51, for example two
  • Contact pins 52 which are used for electrical excitation of the solenoid l. These contact pins 52 extend out of the coil body 3 up to the connector plug 51.
  • the plastic jacket 50 is shaped in such a way that an axially extending inner through opening 54 is formed.
  • the inner through opening 54 of the plastic part 60 is not completely defined by the inner diameter of the plastic jacket 50, but also by the inner diameter of the upper end 6 of the guide element 5 Inner diameter of the bobbin 3 and the inner diameter of the guide ring 10.
  • the diameter of the through-opening 54 is determined by the plastic of the plastic jacket 50, the inside diameter of the opening area 55 located upstream of the magnet coil 1 being larger than the inner diameter of the opening area 56 lying downstream of the magnet coil 1.
  • the plastic jacket 50 not only surrounds the magnet coil assembly in the circumferential direction and in the axial direction, but also extends in the region of the at least one guide element 5 between such a guide element 5 and the magnet coil 1 or the coil body 3.
  • the plastic jacket 50 is directly above the coil body 3 on the through opening 54 executed such that a protruding into the through opening 54, for. B. by 360 ° circumferential locking element 58 slightly reduces the cross section of the through opening 54.
  • This locking element 58 can be designed in the form of a circumferential nose, an inner bead or an inner collar and can have an angular or rounded contour. Likewise, several latching lugs arranged over the circumference of the through opening 54 are conceivable.
  • the outer contour of the plastic jacket 50 is adapted to the desired installation conditions, z. B. on the lower En ⁇ e of the plastic jacket 50, an annular groove 59 is provided, in which a sealing ring 62 ( Figure 1) can be used.
  • the valve part 70 mainly comprises the components core 2, fuel filter 40, adjusting sleeve 39, return spring 33, valve needle 28 with valve closing body 30, armature 24, sleeve 18 and
  • Valve seat body 25 with spray perforated disk 26 The individual components interact in the manner described above or are connected to one another in accordance with the explanations given above with reference to FIG.
  • the use of the relatively inexpensive sleeve 18 makes it possible to dispense with rotating parts that are common in injection valves, such as valve seat supports or nozzle holders, which are more voluminous due to their larger outer diameter and more expensive to manufacture than the sleeve 18.
  • the thin-walled sleeve 18 (wall thickness, for example, 0.3 mm) was formed, for example, by deep drawing, the material being a non-magnetic material, e.g. B. a rust-resistant CrNi steel is used.
  • the sleeve 18 present as a deep-drawn part serves, as already mentioned, due to their large extent to accommodate the valve seat body 25, the spray orifice plate 26, the valve needle 28 with the armature 24, the return spring 33 and at least partially of the core 2 and consequently also the stop area of armature 24 and core 2 to limit the stroke.
  • the sleeve 18 has, for example, a slightly radially outwardly curved peripheral edge 64 at its upper axial end. The peripheral edge 64 is created by separating the material overflow during deep drawing and serves to establish a secure snap-in connection in the injection valve.
  • valve part 70 After the stroke adjustment and the assembly of the individual components to form the valve part 70, the complete valve part 70 is inserted into the through opening 54 of the plastic part 60 from the top
  • the valve part 70 and the plastic part 60 enter into a fixed latching connection with the desired insertion length.
  • the latching element 58 of the plastic part 60 engages in a groove 66 formed between the peripheral edge 64 of the sleeve 18 and an outer core shoulder 65.
  • This can be an intervention, a snap-in or a clip-in.
  • the groove 66 can also be formed at another location on the circumference of the core 2.
  • the geometries of the locking element 58 or the groove 66 are provided in such a way that an absolutely secure, slip-free connection is produced. It is no longer possible to loosen the connection without additional tools.
  • This type of assembly has the great advantage that the high encapsulation pressure (up to 350 bar) required for plastic encapsulation cannot lead to deformation of the thin-walled sleeve 18, since it is only subsequently integrated in the plastic part 60 together with the entire valve part 70.

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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)

Abstract

The invention concerns a fuel injection valve for fuel injection systems of internal combustion engines. The fuel injection valve is composed of two main components: an inner valve part (70) comprises all the individual components lying directly in the fuel flow path, whilst an outer plastics part (60) is formed predominantly by a magnet coil subassembly and a plastics casing (50). The valve part (70) comprises inter alia a thin-walled non-magnetic sleeve (18) which is highly sensitive to mechanical and thermal influences. The valve part (70) is therefore produced and adjusted separately from the plastics part (60). The complete valve part (70) is subsequently inserted into a through-hole (54) in the plastics part (60), a fixed connection between the plastics part (60) and valve part (70) being brought about by engagement, locking or clipping in place. The fuel injection valve is particularly suitable for use in fuel injection systems of mixture-compressing spark-ignition internal combustion engines.

Description

Brennstoffeinspntzventil und Verfahren zur HerstellungFuel injection valve and manufacturing method
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspntzventil nach der Gattung des Anspruchs 1 und einem Verfahren zur Herstellung eines Brennstoffemspπtzventils nach der Gattung des Anspruchs 10.The invention relates to a fuel injection valve according to the preamble of claim 1 and a method for producing a fuel injection valve according to the preamble of claim 10.
Aus der US-PS 4,946,107 ist bereits ein elektromagnetisch betätigbares Brennstoffeinspntzventil bekannt, das unter anderem eine unmagnetische Hülse als Verbindungsteil zwischen einem Kern und einem Ventilsitzkorper aufweist. Mit ihren beiden axialen Enden st die Hülse fest mit dem Kern und mit dem Ventilsitzkorper verbunden. Die Hülse verläuft über ihre gesamte axiale Länge mit einem konstanten Außendurchmesser und einem konstanten Innendurchmesser. Der Kern und der Ventilsitzkorper sind mit einem solchenFrom US Pat. No. 4,946,107 an electromagnetically actuated fuel injection valve is already known, which among other things has a non-magnetic sleeve as a connecting part between a core and a valve seat body. With its two axial ends, the sleeve is firmly connected to the core and to the valve seat body. The sleeve runs over its entire axial length with a constant outside diameter and a constant inside diameter. The core and the valve seat body are with one
Außendurchmesser ausgebildet, daß sie in die Hülse an den beiden Enden hineinreichen, so daß die Hülse die beiden Bauteile Kern und Ventilsitzkorper in diesen hineinragenden Bereichen vollständig umgibt. Im Inneren der Hülse bewegt sich in axialer Richtung eine Ventilnadel mit einem Anker, der durch die Hülse geführt wird. Die festen Verbindungen der Hülse m t dem Kern und dem Ventilsitzkorper werden z. B. mittels Schweißen erzielt. Der Kern und die unmagnetische Hülse begrenzen zusammen ein inneres Ventilteil nach außen, das separat gefertigt und eingestellt wird und später das Innere des Brennstoffeinspritzventils bildet. Dieses innere Ventilteil ist letztlich von mehreren weiteren Einzelbauteilen im zusammengebauten Zustand des Einspritzventils umgeben, wobei wenigstens ein topfförmiges Gehäuseteil, eine Magnetspule mit Spulenkörper, ein becherförmiges Spulengehäuse sowie ein Steckerteil benötigt werden. Die Anordnung und Gestaltung der vielen, das Ventilteil umgebenden Einzelteile ist dabei relativ aufwendig. Außerdem muß eine Vielzahl von Verbindungen zwischen den äußeren Einzelteilen und dem inneren Ventilteil hergestellt werden.Outside diameter formed so that they extend into the sleeve at the two ends, so that the sleeve completely surrounds the two components core and valve seat body in these protruding areas. Inside the sleeve, a valve needle with an armature moves in the axial direction, which is guided through the sleeve. The fixed connections of the sleeve mt the core and the valve seat body z. B. achieved by welding. The core and the non-magnetic sleeve together delimit an inner valve part, which is manufactured and adjusted separately and later forms the inside of the fuel injector. This inner valve part is ultimately surrounded by a plurality of further individual components in the assembled state of the injection valve, at least one cup-shaped housing part, a magnet coil with coil body, a cup-shaped coil housing and a plug part being required. The arrangement and design of the many individual parts surrounding the valve part is relatively complex. In addition, a large number of connections must be made between the outer individual parts and the inner valve part.
Aus der DE-OS 43 10 819 ist ebenso ein Brennstoffeinspritzventil bekannt, welches eine unmagnetische dünnwandige Hülse als Ventilsitzträger aufweist. Das gesamte, fertig eingestellte Brennstoffeinspritzventil , einschließlich der Hülse, ist weitgehend mit einer Kunststoffumspritzung umschlossen, die sich vom Kern ausgehend in axialer Richtung über die Magnetspule bis zum st romabwärtigen Abschluß des Einspritzventils erstreckt. Die tiefgezogene Hülse weist eine nur sehr geringe Wandstärke (< 0,3 mm) auf, um den magnetischen Fluß mit möglichst geringen Verlusten über die unmagnetische Hülse zu führen. Zur Umspritzung des Einspritzventils mit Kunststoff sind hohe Umspritzungsdrücke (bis 350 bar) erforderlich, die zu Verformungen der Hülse führen können, wodurch Montage- und Funktionsprobleme des Einspritzventils auftreten können. Vorteile der ErfindungFrom DE-OS 43 10 819 a fuel injector is also known which has a non-magnetic thin-walled sleeve as a valve seat support. The entire, completely set fuel injector, including the sleeve, is largely enclosed with a plastic extrusion coating, which extends from the core in the axial direction over the solenoid coil to the downstream end of the injection valve. The deep-drawn sleeve has only a very small wall thickness (<0.3 mm) in order to conduct the magnetic flux over the non-magnetic sleeve with as little loss as possible. In order to encapsulate the injection valve with plastic, high encapsulation pressures (up to 350 bar) are required, which can lead to deformation of the sleeve, which can lead to assembly and functional problems of the injection valve. Advantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, daß es auf einfache Art und Weise kostengünstig montierbar ist. Erfindungsgemäß wird diese vereinfachte Montage des Brennstoffeinspritzventils dadurch erreicht, daß zwei Hauptbauteile des Einspritzventils, ein Ventilteil und ein Kunststoffteil, separat voneinander hergestellt und eingestellt werden. Das innere Ventilteil wird dabei in vorteilhafter Weise unter anderem mit einer nichtmagnetischen, dünnwandigen Hülse ausgeführt, deren Einsatz eine Kostenersparnis gegenüber bekannten Ventilen bringt, da Materialeinsparungen möglich sind und auf das Fügen zum Verbinden einzelner Bauteile teilweise verzichtet werden kann. Vorteilhaft ist zudem, daß das äußere Kunststoffteil eine innere Durchgangsöffnung aufweist, in die das Ventilteil sehr einfach einsetzbar und durch eine einfache und trotzdem sichere Rastverbindung befestigbar ist.The fuel injector according to the invention with the characterizing features of claim 1 has the advantage that it can be assembled inexpensively in a simple manner. According to the invention, this simplified assembly of the fuel injector is achieved in that two main components of the injector, a valve part and a plastic part, are manufactured and adjusted separately from one another. The inner valve part is advantageously carried out, inter alia, with a non-magnetic, thin-walled sleeve, the use of which brings cost savings compared to known valves, since material savings are possible and the joining for connecting individual components can be partially dispensed with. It is also advantageous that the outer plastic part has an inner through opening into which the valve part can be inserted very easily and can be fastened by a simple but nevertheless secure snap-in connection.
Durch diese Trennung in zwei Hauptbauteile ergibt sich der besondere Vorteil, daß alle negativen Einflüsse beim Herstellen der Kunststoffumspritzung (große Umspritzungsdrücke, Wärmeentwicklung) von den die wichtigen Ventilfunktionen ausübenden Bauteilen des Ventilteils ferngehalten werden. Eine Verformung der dünnwandigen Hülse des Ventilteils durch den Umspritzungsdruck ist somit vollständig ausgeschlossen. Der relativ schmutzige Umspritzungsvorgang kann in vorteilhafter Weise außerhalb der Montagelinie des Ventilteils (Sauberraum) erfolgen.This separation into two main components results in the particular advantage that all negative influences during the production of the plastic encapsulation (high encapsulation pressures, heat development) are kept away from the components of the valve part which perform the important valve functions. Deformation of the thin-walled sleeve of the valve part due to the extrusion pressure is therefore completely ruled out. The relatively dirty encapsulation process can advantageously take place outside the assembly line of the valve part (clean room).
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich. In vorteilhafter Weise erfolgt die Herstellung der RastVerbindung durch das Eingreifen, Einrasten oder Einklipsen eines Rastelements am Kunststoffteil in eine Nut am äußeren Umfang des Ventilteils. Die Rastelemente können dazu die verschiedensten Konturen aufweisen, z. B. eckig oder abgerundet sein.Advantageous further developments and improvements of the fuel injector specified in claim 1 are possible through the measures listed in the subclaims. The latching connection is advantageously produced by engaging, latching or clipping a latching element on the plastic part into a groove on the outer circumference of the valve part. The locking elements can have a wide variety of contours, z. B. be angular or rounded.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erfindungsgemäßes Brennstoffeinspntzventil, Figur 2 ein äußeres rohrförmiges Kunststoffteil und Figur 3 ein inneres Ventilteil, wobei die Teile der Figuren 2 und 3 montiert und miteinander verbunden ein Brennstoffeinspntzventil gemäß Figur 1 ergeben.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a fuel injection valve according to the invention, FIG. 2 shows an outer tubular plastic part and FIG. 3 shows an inner valve part, the parts of FIGS. 2 and 3 being assembled and connected to one another result in a fuel injection valve according to FIG. 1.
Beschreibung des AusführungsbeispielsDescription of the embodiment
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 dienenden rohrförmigen Kern 2. Ein in radialer Richtung gestufter Spulenkörper 3 nimmt eine Bewicklung der Magnetspule 1 auf und ermöglicht m Verbindung mit dem Kern 2 einen besonders kompakten Aufbau des Einspritzventils im Bereich der Magnetspule 1. Die Magnetspule 1 ist mit ihrem Spulenkörper 3 von wenigstens einem, beispielsweise als Bügel ausgebildeten und als ferromagnetisches Element dienenden Leitelement 5 umgeben, das die Magnetspule 1 m Umfangsrichtung wenigstens teilweise umgibt und mit seinem oberen Ende 6 an dem Kern 2 anliegt. Das wenigstens eine Leitelement 5 ist derart gestuft ausgeführt, daß ein achsparallel verlaufender Hauptabschnitt 7 sowie das obere Ende 6 durch einen radial verlaufenden Verbindungsabschnitt 8 verbunden sind. Der Verbindungsabschnitt 8 stellt einen Deckel des Magnetspulenbereichs nach oben hin dar. Zum Schließen des magnetischen Kreises ist das Leitelement 5 an seinem unteren Ende 9 z. B. mit einem im Querschnitt L-förmigen Leitring 9 beispielsweise durch einen oder mehrere Schweißpunkte verbunden, der die Begrenzung des Magnetspulenbereichs nach unten hin bzw. in stromabwärtiger Richtung darstellt. Die den magnetischen Fluß leitenden Teile Leitelement 5 und Leitring 10 umschließen die auf den Spulenkörper 3 gewickelte Magnetspule 1 zumindest teilweise topfförmig.The electromagnetically actuated valve, for example shown in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines has a tubular core 2, which is surrounded by a magnet coil 1 and serves as a fuel inlet port and enables m connection with the core 2 a particularly compact structure of the injection valve in the area of the magnet coil 1. The magnet coil 1 is surrounded with its coil body 3 by at least one guiding element 5, for example designed as a bracket and serving as a ferromagnetic element, which surrounds the magnet coil 1 at least in the circumferential direction partially surrounds and abuts the core 2 with its upper end 6. The at least one guide element 5 is designed in steps such that an axially parallel main section 7 and the upper end 6 are connected by a radially extending connecting section 8. The connecting section 8 represents a cover of the magnetic coil area upwards. To close the magnetic circuit, the guide element 5 is at its lower end 9 z. B. connected to a cross-sectionally L-shaped guide ring 9, for example by one or more welding spots, which represents the boundary of the magnetic coil region downwards or in the downstream direction. The parts of the guide element 5 and guide ring 10 which conduct the magnetic flux enclose the magnet coil 1, which is wound onto the coil body 3, at least in part in a pot shape.
Mit einem unteren Kernende 15 des Kerns 2, das einen etwas geringeren Außendurchmesser aufweist als das Zulaufseitige , als Brennstoffeinlaß dienende obere Ende des Kerns 2, ist konzentrisch zu einer Ventillängsachse 16 dicht eine alsWith a lower core end 15 of the core 2, which has a slightly smaller outer diameter than the inlet side, serving as fuel inlet, the upper end of the core 2, is concentrically sealed to a valve longitudinal axis 16 as a
Verbindungsteil dienende rohrförmige und dünnwandige Hülse 18, beispielsweise durch Schweißen, verbunden und umgibt dabei mit einem oberen Hülsenabschnitt 19 das Kernende 15 teilweise axial. Der Spulenkörper 3 übergreift den Hülsenabschnitt 19 der Hülse 18 zumindest teilweise axial.Connecting part serving tubular and thin-walled sleeve 18, for example by welding, connected and thereby partially surrounds the core end 15 axially with an upper sleeve portion 19. The coil former 3 overlaps the sleeve section 19 of the sleeve 18 at least partially axially.
Der Spulenkörper 3 besitzt nämlich über seine gesamte axiale Erstreckung einen größeren Innendurchmesser als den Durchmesser der Hülse 18 in ihrem oberen Hülsenabschnitt 19. Die rohrförmige Hülse 18 aus beispielsweise nichtmagnetischem Stahl erstreckt sich stromabwärts mit einem unteren Hülsenabschnitt 20 bis zum stromabwärtigen Abschluß des Brennstoffeinspritzventils, wobei der untere Hülsenabschnitt 20 einen geringfügig kleineren Durchmesser besitzt als der Durchmesser des oberen Hülsenabschnitts 19. Die Durchmesserreduzierung in Form eines kleinen Absatzes 23 befindet sich dabei im Bereich des oberen Endes des Leitrings 10, da der Leitring 10 einen minimal kleineren Innendurchmesser aufweist als der Innendurchmesser des Spulenkörpers 3. Diese Ausgestaltung tragt zur sicheren Montage des Einspritzventils bei, die spater ausführlich beschrieben wird.The coil body 3 has namely over its entire axial extent a larger inner diameter than the diameter of the sleeve 18 in its upper sleeve section 19. The tubular sleeve 18 made of, for example, non-magnetic steel extends downstream with a lower sleeve section 20 to the downstream end of the fuel injector, the lower sleeve section 20 has a slightly smaller diameter than the diameter of the upper sleeve section 19. The diameter reduction in the form of a small shoulder 23 is located in the area of the upper end of the guide ring 10, since the guide ring 10 has a minimally smaller inside diameter than the inside diameter of the coil body 3. This configuration contributes to the safe assembly of the injection valve, which will be described in detail later.
Die Hülse 18 ist also über ihre gesamte axiale Länge rohrformig ausgebildet. Dabei bildet die Hülse 18 über ihre gesamte axiale Ausdehnung eine Durchgangsoffnung 21 mit abgesehen vom Absatz 23 weitgehend konstantem Durchmesser, die konzentrisch zu der Ventillängsachse 16 verlauft. Mit ihrem dem Absatz 23 stromabwärts folgenden Hulsenabschnitt umgibt die Hülse 18 einen Anker 24 und weiter stromabwärts einen Ventilsitzkorper 25. Eine mit dem Ventilsitzkorper 25 an dessen stromabwartiger Stirnseite fest verbundene z. B. topfformige Spπtzlochscheibe 26 wird von der Hülse 18 in Umfangsrichtung ebenso umschlossen, wobei die feste Verbindung von Ventilsitzkorper 25 und Spritzlochscheibe 26 z. B. durch eine umlaufende dichte Schweißnaht realisiert ist. Die Hülse 18 ist somit nicht nur ein Verbindungsteil, sondern sie erfüllt auch Halte- bzw. Tragerfunktionen, insbesondere für den Ventilsitzkorper 25, so daß die Hülse 18 wirklich auch Ventilsitztrager ist. In der Durchgangsoffnung 21 ist eine z. B. rohrförmige Ventilnadel 28 angeordnet, die an ihrem stromabwärtigen, der Spritzlochscheibe 26 zugewandten Ende 29 mit einem z. B. kugelförmigen Ventilschließkόrper 30, an dessen Umfang beispielsweise fünf Abflachungen 31 zum Vorbeiströmen des abzuspritzenden Brennstoffs vorgesehen sind, beispielsweise durch Schweißen verbunden ist.The sleeve 18 is thus tubular over its entire axial length. In this case, the sleeve 18 forms a through-opening 21 with a largely constant diameter apart from the shoulder 23 over its entire axial extent, which runs concentrically to the valve longitudinal axis 16. With its sleeve section following the paragraph 23 downstream, the sleeve 18 surrounds an armature 24 and further downstream a valve seat body 25. A valve seat body 25 which is fixedly connected to the valve seat body 25 on its downstream end face, for. B. pot-shaped Spπtz perforated disk 26 is also surrounded by the sleeve 18 in the circumferential direction, the fixed connection of the valve seat body 25 and spray perforated disk 26 z. B. is realized by a circumferential dense weld. The sleeve 18 is thus not only a connecting part, but it also fulfills holding or carrying functions, in particular for the valve seat body 25, so that the sleeve 18 is really also a valve seat support. In the passage opening 21 is a z. B. tubular valve needle 28 arranged at its downstream, the spray hole 26 facing end 29 with a z. B. spherical valve closing body 30, on the circumference of which, for example, five flattenings 31 are provided for the fuel to be sprayed to flow past, for example connected by welding.
Die Betätigung des Einspritzventils erfolgt in bekannter Weise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 28 und damit zum Öffnen entgegen der Federkraft einer Rückstellfeder 33 bzw. Schließen des Einspritzventils dient der elektromagnetische Kreis mit der Magnetspule 1, dem Kern 2, dem wenigstens einen Leitelement 5, dem Leitring 10 und dem Anker 24. Der Anker 24 ist mit dem dem Ventilschließkörper 30 abgewandten Ende der Ventilnadel 28 z. B. durch eine Schweißnaht verbunden und auf den Kern 2 ausgerichtet. Zur Führung des Ventilschließkörpers 30 während der Axialbewegung der Ventilnadel 28 mit dem Anker 24 entlang der Ventillängsachse 16 dient eine Führungsöffnung 34 des Ventilsitzkörpers 25. Außerdem wird der Anker 24 während der Axialbewegung in der Hülse 18 geführt .The injection valve is actuated electromagnetically in a known manner. For the axial movement of the valve needle 28 and thus for opening against the spring force a return spring 33 or closing the injection valve serves the electromagnetic circuit with the magnet coil 1, the core 2, the at least one guide element 5, the guide ring 10 and the armature 24. The armature 24 is connected to the end of the valve needle 28 facing away from the valve closing body 30, for . B. connected by a weld and aligned to the core 2. A guide opening 34 of the valve seat body 25 serves to guide the valve closing body 30 during the axial movement of the valve needle 28 with the armature 24 along the valve longitudinal axis 16. In addition, the armature 24 is guided in the sleeve 18 during the axial movement.
Der kugelförmige Ventilschließkörper 30 wirkt mit einer sich in Strömungsrichtung kegelstumpfförmig verjüngendenThe spherical valve closing body 30 acts with a conical taper in the flow direction
Ventilsitzfläche 35 des Ventilsitzkörpers 25 zusammen, die in axialer Richtung stromabwärts der Führungsöffnung 34 ausgebildet ist. Die topfformige Spritzlochscheibe 26 besitzt neben einem Bodenteil 41, an dem der Ventilsitzkorper 25 befestigt ist und in dem wenigstens eine, beispielsweise vier durch Erodieren oder Stanzen ausgeformte Abspritzöffnungen 42 verlaufen, einen umlaufenden stromabwärts verlaufenden Halterand 43. Der Halterand 43 ist stromabwärts konisch nach außen gebogen, so daß dieser an der durch die Durchgangsöffnung 21 bestimmten inneren Wandung der Hülse 18 anliegt, wobei eine radiale Pressung vorliegt. An seinem stromabwärtigen Ende ist der Halterand 43 der Spritzlochscheibe 26 mit der Wandung der Hülse 18 beispielsweise durch eine umlaufende und dichte z. B. mittels eines Lasers erzeugte Schweißnaht verbunden. Ein unmittelbares Durchströmen des Brennstoffs in eine Ansaugleitung der Brennkraf maschine außerhalb der Abspritzöffnungen 42 wird durch die Schweißnähte an der ≤pritzlochscheibe 26 vermieden. Die Einschubtiefe des Ventilsitzkörpers 25 mit der Spritzlochscheibe 26 in der Hülse 18 ist unter anderem entscheidend für den Hub der Ventilnadel 28. Dabei ist die eine Endstellung der Ventilnadel 28 bei nicht erregter Magnetspule 1 durch die Anlage des Ventilschließkorpers 30 an der Ventilsitzflache 35 des Ventilsitzkörpers 25 festgelegt, wahrend sich die andere Endstellung der Ventilnadel 28 bei erregter Magnetspule 1 durch die Anlage des Ankers 24 am Kernende 15 ergibt. Außerdem erfolgt die Hubemstellung durch das axiale Verschieben des mit geringem Übermaß eingepreßten Kerns 2 in dem oberen Hülsenabschnitt 19 der Hülse 18. Der Kern 2 wird in der entsprechend gew nschten Position nachfolgend fest mit der Hülse 18 verbunden, wobei eine Laserschweißung am Umfang der Hülse 18 sinnvoll ist. Das Fügeubermaß der Preßpassung kann auch ausreichend groß gewählt werden, so daß die auftretenden Kräfte aufgenommen werden können und die vollständige Dichtheit garantiert ist, wodurch auf eine Schweißung verzichtet werden kann.Valve seat surface 35 of the valve seat body 25 together, which is formed in the axial direction downstream of the guide opening 34. In addition to a base part 41, to which the valve seat body 25 is fastened and in which at least one, for example four, spray openings 42 formed by erosion or stamping run, the pot-shaped spray perforated disk 26 has a circumferential, downstream holding edge 43. The holding edge 43 is conically bent outwards downstream , so that it bears against the inner wall of the sleeve 18, which is determined by the through opening 21, a radial pressure being present. At its downstream end, the holding edge 43 of the spray disk 26 with the wall of the sleeve 18 is, for example, by a circumferential and dense z. B. connected by a laser generated weld. A direct flow of fuel into an intake line of the internal combustion engine outside the spray openings 42 is avoided by the welds on the pr injection perforated disk 26. The insertion depth of the valve seat body 25 with the spray orifice disk 26 in the sleeve 18 is decisive, among other things, for the stroke of the valve needle 28. The end position of the valve needle 28 when the solenoid coil 1 is not excited is due to the valve closing body 30 resting on the valve seat surface 35 of the valve seat body 25 fixed, while the other end position of the valve needle 28 results when the magnet coil 1 is excited by the contact of the armature 24 at the core end 15. In addition, the stroke adjustment takes place by the axial displacement of the core 2 pressed in with a slight oversize in the upper sleeve section 19 of the sleeve 18. The core 2 is subsequently firmly connected to the sleeve 18 in the desired position, with laser welding on the circumference of the sleeve 18 makes sense. The interference fit of the press fit can also be chosen to be sufficiently large so that the forces which arise can be absorbed and complete tightness is guaranteed, as a result of which welding can be omitted.
In eine konzentrisch zu der Ventillangsachse 16 verlaufende abgestufte Stromungsbohrung 38 des Kerns 2, die der Zufuhr des Brennstoffs in Richtung des Ventilsitzes, speziell der Ventilsitzflache 35 dient, ist eine Einstellhulse 39 eingeschoben. Die Einstellhülse 39 dient zur Einstellung der Federvorspannung der an der Einstellhulse 39 anliegenden Rückstellfeder 33, die sich wiederum mit ihrer gegenüberliegenden Seite an der Ventilnadel 28 abstutzt. Ein Brennstoffilter 40 ragt in die Stromungsbohrung 38 des Kerns 2 an dessen zulaufseitigem Ende und sorgt für dieAn adjusting sleeve 39 is inserted into a stepped flow bore 38 of the core 2, which runs concentrically to the longitudinal valve axis 16 and serves to supply the fuel in the direction of the valve seat, especially the valve seat surface 35. The adjusting sleeve 39 is used to adjust the spring preload of the return spring 33 abutting the adjusting sleeve 39, which in turn is supported on the valve needle 28 with its opposite side. A fuel filter 40 protrudes into the flow bore 38 of the core 2 at its inlet end and ensures that
Herausflltrierung solcher Brennstoffbestandteile, die aufgrund ihrer Größe im Einspritzventil Verstopfungen oder Beschädigungen verursachen konnten. Das fertig eingestellte und montierte Einspritzventil ist weitgehend von einem Kunststoffmantel 50 umgeben, der sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 bis zum stro abwartigen Abschluß der Hülse 18 erstreckt, wobei zu diesem Kunststoffmantel 50 ein mitangespritzter elektrischer Anschlußstecker 51 gehört. Über den elektrischen Anschlußstecker 51 erfolgt die elektrische Kontakt erung der Magnetspule 1 und damit deren Erregung. Wie die Figur 2 zeigt, handelt es sich bei dem Kunststoffmantel 50 um ein rohrförmiges Kunststoff eil , das sich erheblich von Kunststoffumspπtzungen bekannter Brennstoffeinspntzventile unterscheidet .Filter out those fuel components that could cause blockages or damage due to their size in the injection valve. The completely set and assembled injection valve is largely surrounded by a plastic jacket 50, which extends from the core 2 in the axial direction via the magnetic coil 1 to the immediate termination of the sleeve 18, with this plastic jacket 50 having a co-molded electrical connector 51. About the electrical connector 51, the electrical contact generation of the solenoid 1 and thus their excitation. As FIG. 2 shows, the plastic jacket 50 is a tubular plastic rope, which differs considerably from plastic fuel injection valves of known fuel injection valves.
In der Figur 2 ist ein äußeres rohrförmiges Kunststoffteil 60 mit der Magnetspulenbaugruppe dargestellt, das hauptsachlich von dem Kunststoffmantel 50 mit dem Anschlußstecker 51 gebildet wird. Dieses Kunststoffteil 60 besteht konkret aus der Magnetspule 1, dem die Wicklungen der Magnetεpule 1 tragenden Spulenkorper 3 aus Kunststoff, dem wenigstens einen z. B. bügeif rmigen Leitelement 5, dem Leitring 10 und dem diese als Magnetspulenbaugruppe bezeichenbare Anordnung in Umfangsrichtung nach außen hin vollständig umschließenden Kunststoffmantel 50 Der rohrförmige Kunststoffmantel 50 umfaßt dabei den herkömmlich ausgebildeten Anschlußstecker 51, der beispielsweise zweiFIG. 2 shows an outer tubular plastic part 60 with the magnetic coil assembly, which is mainly formed by the plastic jacket 50 with the connector 51. This plastic part 60 consists specifically of the magnet coil 1, the coil body 3 carrying the windings of the magnet coil 1 made of plastic, the at least one z. B. Bügif-shaped guide element 5, the guide ring 10 and this designation as a magnetic coil assembly in the circumferential direction to the outside completely enclosing plastic jacket 50 The tubular plastic jacket 50 includes the conventionally designed connector 51, for example two
Kontaktstif e 52 aufweist, die der elektrischen Erregung der Magnetspule l dienen. Diese Kontaktstifte 52 erstrecken sich aus dem Spulenkörper 3 heraus bis zum Anschlußstecker 51.Contact pins 52, which are used for electrical excitation of the solenoid l. These contact pins 52 extend out of the coil body 3 up to the connector plug 51.
Der Kunststoffmantel 50 ist so ausgeformt, daß eine axial verlaufende, innere Durchgangsöffnung 54 gebildet ist. Die innere Durchgangsöffnung 54 des Kunststoffteils 60 wird dabei nicht vollständig durch den Innendurchmesser des Kunststoffmantels 50 festgelegt, sondern auch durch den Innendurchmesser des oberen Endes 6 des Leitelements 5, den Innendurchmesser des Spulenkόrpers 3 sowie den Innendurchmesser des Leitrings 10. Entsprechend der bereits beschriebenen minimalen Unterschiede der Innendurchmesser der Bauteile 3, 5 und 10 ergibt sich eine mehrfach leicht gestufte Durchgangsöffnung 54 des Kunststoffteils 60.The plastic jacket 50 is shaped in such a way that an axially extending inner through opening 54 is formed. The inner through opening 54 of the plastic part 60 is not completely defined by the inner diameter of the plastic jacket 50, but also by the inner diameter of the upper end 6 of the guide element 5 Inner diameter of the bobbin 3 and the inner diameter of the guide ring 10. Corresponding to the minimal differences in the inner diameters of the components 3, 5 and 10 already described, there is a through-opening 54 of the plastic part 60 which is stepped several times.
Außerhalb der Magnetspulenbaugruppe wird der Durchmesser der Durchgangsöffnung 54 durch den Kunststoff des Kunststoffmantels 50 festgelegt, wobei der Innendurchmesser des stromaufwärts der Magnetspule 1 liegenden Öffnungsbereichs 55 größer st als der Innendurchmesser des stromabwärts der Magnetspule 1 liegenden Offnungsbereichs 56.Outside the magnet coil assembly, the diameter of the through-opening 54 is determined by the plastic of the plastic jacket 50, the inside diameter of the opening area 55 located upstream of the magnet coil 1 being larger than the inner diameter of the opening area 56 lying downstream of the magnet coil 1.
Der Kunststoffmantel 50 umschließt die Magnetspulenbaugruppe nicht nur in Umfangsrichtung und in axialer Richtung, sondern er erstreckt sich auch im Bereich des wenigstens einen Leitelements 5 zwischen einem solchen Leitelement 5 und der Magnetspule 1 bzw. dem Spulenkorper 3 Unmittelbar oberhalb des Spulenkorpers 3 ist der Kunststoffmantel 50 an der Durchgangsöffnung 54 derart ausgeführt, daß ein in die Durchgangsöffnung 54 hineinragendes, z. B. um 360° umlaufendes Rastelement 58 den Querschnitt der Durchgangsöffnung 54 etwas verkleinert. Dieses Rastelement 58 kann in Form einer umlaufenden Nase, einer Innenwulst bzw. eines inneren Kragens ausgebildet sein und eine eckige oder abgerundete Kontur aufweisen. Ebenso sind mehrere über den Umfang der Durchgangsöffnung 54 angeordnete Rastnasen denkbar. Die äußere Kontur des Kunststoffmantels 50 ist den gewünschten Einbaubedingungen angepaßt, wobei z. B. am unteren Enαe des Kunststoffmantels 50 eine Ringnut 59 vorgesehen ist, in die ein Dichtring 62 (Figur 1) einsetzbar is .The plastic jacket 50 not only surrounds the magnet coil assembly in the circumferential direction and in the axial direction, but also extends in the region of the at least one guide element 5 between such a guide element 5 and the magnet coil 1 or the coil body 3. The plastic jacket 50 is directly above the coil body 3 on the through opening 54 executed such that a protruding into the through opening 54, for. B. by 360 ° circumferential locking element 58 slightly reduces the cross section of the through opening 54. This locking element 58 can be designed in the form of a circumferential nose, an inner bead or an inner collar and can have an angular or rounded contour. Likewise, several latching lugs arranged over the circumference of the through opening 54 are conceivable. The outer contour of the plastic jacket 50 is adapted to the desired installation conditions, z. B. on the lower Enαe of the plastic jacket 50, an annular groove 59 is provided, in which a sealing ring 62 (Figure 1) can be used.
Die Ausbildung eines solchen Kunststoffteils 60 mit dem Rastelement 58 gemäß Figur 2 ermöglicht eine für Brennstoffeinspritzventile neuartige und vereinfachte Montage. Die den magnetischen Fluß leitenden Teile Leitelement 5 und Leitring 10 werden zuerst an dem Spulenkörper 3 mit der Magnetspule 1 beispielsweise durch eine Clipverbindung oder durch Schweißpunkte fest verbunden. Diese Magnetspulenbaugruppe wird nachfolgend mit Kunststoff umspritzt, so daß die bereits ausführlich beschriebene Kontur des Kunststoffteils 60 entsteht. Dabei wird die innere Durchgangsöffnung 54 erzielt, indem im Kunststoffumspritzungswerkzeug ein Dorn vorgesehen ist, der ein in der Figur 3 dargestelltes inneres Ventilteil 70 simulier .The formation of such a plastic part 60 with the latching element 58 according to FIG. 2 enables one for Fuel injectors new and simplified assembly. The parts of the guide element 5 and guide ring 10 which conduct the magnetic flux are first firmly connected to the coil body 3 with the magnet coil 1, for example by a clip connection or by welding points. This solenoid assembly is subsequently encapsulated with plastic, so that the contour of the plastic part 60, which has already been described in detail, is created. In this case, the inner through opening 54 is achieved in that a mandrel is provided in the plastic extrusion molding tool, which simulates an inner valve part 70 shown in FIG. 3.
Das in der Figur 3 gezeigte, separat vom Kunststoffteil 60 hergestellte und eingestellte Ventilteil 70 entspricht der inneren Baugruppe des in Figur 1 dargestellten Brennstoffeinspritzventils . Das Ventilteil 70 umfaßt hauptsächlich die Bauteile Kern 2, Brennstoffilter 40, Einstellhülse 39, Rückstellfeder 33, Ventilnadel 28 mit Ventilschließkörper 30, Anker 24, Hülse 18 undThe valve part 70 shown in FIG. 3, manufactured and adjusted separately from the plastic part 60, corresponds to the inner assembly of the fuel injector shown in FIG. The valve part 70 mainly comprises the components core 2, fuel filter 40, adjusting sleeve 39, return spring 33, valve needle 28 with valve closing body 30, armature 24, sleeve 18 and
Ventilsitzkorper 25 mit Spritzlochscheibe 26. Die einzelnen Bauteile wirken in oben beschriebener Weise zusammen bzw. sind entsprechend den zuvor bezüglich Figur 1 gemachten Erläuterungen miteinander verbunden.Valve seat body 25 with spray perforated disk 26. The individual components interact in the manner described above or are connected to one another in accordance with the explanations given above with reference to FIG.
Durch den Einsatz der relativ billigen Hülse 18 wird es möglich, auf in Einspritzventilen übliche Drehteile, wie Ventilsitzträger oder Düsenhalter, die aufgrund ihres größeren Außendurchmessers voluminöser und bei der Herstellung teurer als die Hülse 18 sind, zu verzichten. Die dünnwandige Hülse 18 (Wandstärke z. B. 0,3 mm) ist beispielsweise durch Tiefziehen ausgebildet worden, wobei als Werkstoff ein nichtmagnetisches Material, z. B. ein rostbeständiger CrNi-Stahl verwendet ist. Die als Blechtiefziehteil vorliegende Hülse 18 dient, wie bereits erwähnt, aufgrund ihrer großen Erstreckung zur Aufnahme des Ventilsitzkörpers 25, der Spritzlochscheibe 26, der Ventilnadel 28 mit dem Anker 24, der Rückstellfeder 33 sowie zumindest teilweise des Kerns 2 und folglich auch des Anschlagbereichs von Anker 24 und Kern 2 zur Begrenzung des Hubes. Die Hülse 18 besitzt an ihrem oberen axialen Ende beispielsweise einen leicht radial nach außen gebogenen Umlaufrand 64. Der Umlaufrand 64 entsteht durch das Abtrennen des Stoffüberlaufs beim Tiefziehen und dient der Herstellung einer sicheren Rastverbindung im Einspritzventil .The use of the relatively inexpensive sleeve 18 makes it possible to dispense with rotating parts that are common in injection valves, such as valve seat supports or nozzle holders, which are more voluminous due to their larger outer diameter and more expensive to manufacture than the sleeve 18. The thin-walled sleeve 18 (wall thickness, for example, 0.3 mm) was formed, for example, by deep drawing, the material being a non-magnetic material, e.g. B. a rust-resistant CrNi steel is used. The sleeve 18 present as a deep-drawn part serves, as already mentioned, due to their large extent to accommodate the valve seat body 25, the spray orifice plate 26, the valve needle 28 with the armature 24, the return spring 33 and at least partially of the core 2 and consequently also the stop area of armature 24 and core 2 to limit the stroke. The sleeve 18 has, for example, a slightly radially outwardly curved peripheral edge 64 at its upper axial end. The peripheral edge 64 is created by separating the material overflow during deep drawing and serves to establish a secure snap-in connection in the injection valve.
Nach der Hubeinstellung und der Montage der Einzelbauteile zum Ventilteil 70 wird das komplette Ventilteil 70 in die Durchgangsöffnung 54 des Kunststoffteils 60 vom oberenAfter the stroke adjustment and the assembly of the individual components to form the valve part 70, the complete valve part 70 is inserted into the through opening 54 of the plastic part 60 from the top
Öffnungsbereich 55 her eingeschoben. Das Ventilteil 70 und das Kunststoffteil 60 gehen bei entsprechend gewünschter Einschublänge eine feste Rastverbindung ein. Dazu greift das Rastelement 58 des Kunststoffteils 60 in eine zwischen dem Umlaufrand 64 der Hülse 18 und einem äußeren Kernabsatz 65 gebildete Nut 66 ein. Dabei kann es sich um ein Eingreifen, ein Einrasten oder ein Einklipsen handeln. Die Nut 66 kann auch an einer anderen Stelle am Umfang des Kerns 2 ausgebildet sein. Die Geometrien des Rastelements 58 bzw. der Nut 66 sind dabei so vorgesehen, daß eine absolut sichere, verrutschungsfreie Verbindung entsteht. Ein Lösen der Verbindung ohne zusätzliches Werkzeug ist nicht mehr möglich. Diese Art der Montage hat den großen Vorteil, daß der beim Kunststoffumspritzen erforderliche hohe Umspritzungsdruck (bis 350 bar) nicht zu Verformungen der dünnwandigen Hülse 18 führen kann, da diese erst nachträglich zusammen mit dem gesamten Ventilteil 70 im Kunststoffteil 60 integriert wird. Opening area 55 inserted here. The valve part 70 and the plastic part 60 enter into a fixed latching connection with the desired insertion length. For this purpose, the latching element 58 of the plastic part 60 engages in a groove 66 formed between the peripheral edge 64 of the sleeve 18 and an outer core shoulder 65. This can be an intervention, a snap-in or a clip-in. The groove 66 can also be formed at another location on the circumference of the core 2. The geometries of the locking element 58 or the groove 66 are provided in such a way that an absolutely secure, slip-free connection is produced. It is no longer possible to loosen the connection without additional tools. This type of assembly has the great advantage that the high encapsulation pressure (up to 350 bar) required for plastic encapsulation cannot lead to deformation of the thin-walled sleeve 18, since it is only subsequently integrated in the plastic part 60 together with the entire valve part 70.

Claims

Patentansprüche claims
1. Brennstoffeinspntzventil für Brennstoffemspritzanlagen von Brennkraftmaschinen, mit einer Ventillängsachse, mit einem rohrformigen Kern, mit einer Magnetspule, mit wenigstens einem einen elektromagnetischen Kreis schließenden Leitelement, mit einem Ventilschließkörper, der Teil einer axial entlang der Ventillängsachse bewegbaren Ventilnadel ist und der mit einem an einem Ventilsitzkorper vorgesehenen Ventilsitz zusammenwirkt, mit einer dünnwandigen, sich axial erstreckenden, nichtmagnetischen Hülse, in der sich die Ventilnadel axial bewegt und die fest m t dem Kern verbunden ist, wobei der Kern und die Hülse zusammen ein Ventilteil nε.ch außen hin begrenzen, und mit einer zumindest teilweise das Brennstoffe spritzventil umschließenden Kunststoffumspritzung, dadurch gekennzeichnet, daß a) die Kunststoffumspritzung als Kunststoffmantel (50) die Magnetspule (1) und das wenigstens eine Leitelement (5, 10) zumindest teilweise umgibt und mit diesen zusammen ein eigenständig gefertigtes Kunststoffteil (60) bildet, b) das Kunststoffteil (60) eine innere Durchgangsöffnung (54) aufweist und c) das eigenständig gefertigte Ventilteil (70) in der Durchgangsöffnung (54) durch eine Rastverbindung fest mit dem Kunststoffteil (60) verbunden ist1. Fuel injection valve for fuel injection systems of internal combustion engines, with a longitudinal valve axis, with a tubular core, with a magnetic coil, with at least one guiding element closing an electromagnetic circuit, with a valve closing body which is part of a valve needle which can be moved axially along the longitudinal valve axis and with one on one Valve seat body provided valve seat cooperates with a thin-walled, axially extending, non-magnetic sleeve in which the valve needle moves axially and which is firmly connected to the core, the core and the sleeve together delimiting a valve part nε.ch on the outside, and with an at least partially surrounding the fuel injection valve plastic encapsulation, characterized in that a) the plastic encapsulation as a plastic jacket (50) at least partially surrounds the magnetic coil (1) and the at least one guide element (5, 10) and together with them an independently g finished plastic part (60), b) the plastic part (60) has an inner through opening (54) and c) the independently manufactured valve part (70) in the through opening (54) is firmly connected to the plastic part (60) by a snap-in connection
2. Brennstoffeinspntzventil nach Anspruch 1, dadurch gekennzeichnet, daß in der Durchgangsöffnung (54) des Kunststoffteils (60) wenigstens ein Rastelement (58) vorgesehen ist.2. Fuel injection valve according to claim 1, characterized in that in the through opening (54) of the plastic part (60) at least one latching element (58) is provided.
3. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß am Umfang des Ventilteils (70) wenigstens eine Nut (66) vorgesehen ist3. Fuel injection valve according to claim 1, characterized in that at least one groove (66) is provided on the circumference of the valve part (70)
4. Brennstoffeinspntzventil nach Anspruch 2 und 3, dadurch gekennzeichnet, daß durch Eingreifen, Einrasten oder4. Fuel injection valve according to claim 2 and 3, characterized in that by intervention, engagement or
Emklipsen des wenigstens einen Rastelements (58) in die wenigstens eine Nut (66) die feste Rastverbindung herstellbar ist.Unclipping the at least one locking element (58) into the at least one groove (66) enables the fixed locking connection to be produced.
5. Brennstoffeinspntzventil nach Anspruch 2 oder 4, dadurch gekennzeichnet, daß das Rastelement (58) eine in die Durchgangsöffnung (54) hineinragende, umlaufende Rastnase5. Fuel injection valve according to claim 2 or 4, characterized in that the latching element (58) projects into the through opening (54), encircling latching nose
6. Brennstoffeinspntzventil nach Anspruch 2 oder 4, dadurch gekennzeichnet, daß das wenigstens eine Rastelement (58) mehrere über den Umfang der Durchgangsöffnung (54) angeordnete Rastnasen sind.6. Fuel injection valve according to claim 2 or 4, characterized in that the at least one locking element (58) are a plurality of locking lugs arranged over the circumference of the through opening (54).
7. Brennstoffeinspntzventil nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß die Hülse (18) an ihrem oberen Ende einen Umlaufrand (64) aufweist, der teilweise eine Nut (66) am äußeren Umfang des Ventilteils (70) begrenzt. 7. Fuel injection valve according to claim 1 or 3, characterized in that the sleeve (18) has at its upper end a peripheral edge (64) which partially delimits a groove (66) on the outer circumference of the valve part (70).
8. Brennstoffeinspritzventil nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß die wenigstens eine Nut (66) am Umfang des Kerns (2) vorgesehen ist.8. Fuel injection valve according to claim 1 or 3, characterized in that the at least one groove (66) is provided on the circumference of the core (2).
9. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Hülse (18) des Ventilteils (70) ein Blechtiefziehteil darstellt.9. Fuel injection valve according to claim 1, characterized in that the sleeve (18) of the valve part (70) is a sheet metal deep-drawn part.
10. Verfahren zur Herstellung eines Brennstoffeinspritz- ventils nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß in einem Verfahrensschritt ein eigenständiges Ventilteil (70) und in einem weiteren Verfahrensschritt ein eigenständiges Kunststoffteil (60) hergestellt werden und in einem abschließenden Verfahrensschritt das Ventilteil (70) und das Kunststoffteil (60) mittels einer Rastverbindung zusammengefügt werden.10. A method for producing a fuel injection valve according to one of claims 1 to 9, characterized in that in a process step, an independent valve part (70) and in a further process step, an independent plastic part (60) are manufactured and in a final process step, the valve part (70) and the plastic part (60) are joined together by means of a snap connection.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Rastverbindung durch ein Eingreifen, Einrasten oder Einklipsen des Ventilteils (70) im Kunststoffteil (60) erzielt wird. 11. The method according to claim 10, characterized in that the latching connection is achieved by engaging, latching or clipping the valve part (70) in the plastic part (60).
EP97923728A 1996-08-02 1997-04-08 Fuel injection valve and method of producing the same Expired - Lifetime EP0865574B1 (en)

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DE19631280 1996-08-02
DE19631280A DE19631280A1 (en) 1996-08-02 1996-08-02 Fuel injector and manufacturing method
PCT/DE1997/000710 WO1998005861A1 (en) 1996-08-02 1997-04-08 Fuel injection valve and method of producing the same

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EP0865574A1 true EP0865574A1 (en) 1998-09-23
EP0865574B1 EP0865574B1 (en) 2002-02-20

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KR (1) KR100482905B1 (en)
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US6012655A (en) 2000-01-11
KR19990063902A (en) 1999-07-26
CN1198199A (en) 1998-11-04
JP3737130B2 (en) 2006-01-18
EP0865574B1 (en) 2002-02-20
DE19631280A1 (en) 1998-02-05
RU2177074C2 (en) 2001-12-20
DE59706434D1 (en) 2002-03-28
JPH11513101A (en) 1999-11-09
CN1078668C (en) 2002-01-30
ES2172788T3 (en) 2002-10-01
KR100482905B1 (en) 2005-07-25
WO1998005861A1 (en) 1998-02-12

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