EP0222997B1 - Electromagnetically actuated fuel injector - Google Patents

Electromagnetically actuated fuel injector Download PDF

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Publication number
EP0222997B1
EP0222997B1 EP86112189A EP86112189A EP0222997B1 EP 0222997 B1 EP0222997 B1 EP 0222997B1 EP 86112189 A EP86112189 A EP 86112189A EP 86112189 A EP86112189 A EP 86112189A EP 0222997 B1 EP0222997 B1 EP 0222997B1
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EP
European Patent Office
Prior art keywords
fuel
core
injection valve
valve according
magnetic injection
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.)
Expired
Application number
EP86112189A
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German (de)
French (fr)
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EP0222997A1 (en
Inventor
Waldemar Ing. Hans
Wilhelm Dipl.-Ing. Kind
Heinrich Dipl.-Phys. Knapp
Wolfgang Ing. Kramer
Rudolf Dr.-Ing. Sauer
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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 EP0222997A1 publication Critical patent/EP0222997A1/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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • F02M51/0675—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection

Definitions

  • the invention relates to an electromagnetically actuated fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve is already known in which the fuel flowing to the valve seat first flows around the solenoid coil, on the one hand to cool it and on the other hand to carry vapor bubbles which may occur during such a flow through the fuel injection valve into a return flow line (GB-A-2 116 255).
  • the magnetic injection valve according to the invention with the characterizing features of the main claim has the advantage of injecting a largely vapor-bubble-free, ignitable fuel into the intake tract of an internal combustion engine even in the first decisive seconds after the hot start. This is achieved by a large, heat-absorbing surface of the interior of the magnetic injector, which is flushed with fuel. By redirecting the fuel flow between the connecting piece and the valve seat, the amount of thick juice stored in the valve at all times (meaning the gasoline without the volatile components) is increased, thus ensuring the availability of this important fuel for the first seconds after the hot start.
  • 1 denotes, in a first approximation, a pot-shaped valve housing, in which a magnet coil 3 is arranged on a coil carrier 2.
  • the magnet coil 3 has a contact lug 4, which leads out of the magnet coil 3 and the coil carrier 2.
  • the coil carrier 2 of the magnet coil 3 is seated in an interior 6 of the valve housing 1 on a core 7, which partly projects into the interior 6 of the valve housing 1 and closes the interior 6 with a flange 8.
  • the flange 8 is seated on the one hand on a shoulder 9 of the valve housing 1 and on the other hand is partially surrounded by a flange 10 of the valve housing 1 and pressed against the paragraph 9 by this flange 10.
  • the core 7 continues on the side of the flange 8 facing away from the magnet coil 3 in a connecting piece 11. Facing away from the flange 8 of the core 7, the interior 6 of the valve housing 1 is delimited by a magnetic flux guide shoulder 25 of the valve housing 1, which extends radially inwards and has a through hole 26 in alignment with the core 7.
  • the coil carrier 2 is seated on the magnetic flux guide paragraph 25. Aligned to the core 7, a ring-shaped armature 27 projects into the through bore 26 of the magnetic flux guide shoulder with little play.
  • the armature 27 has a first blind bore 23 aligned with the core 7 and a second blind bore 24 facing away from the core 7 and coaxial with the first blind bore 23 and the valve axis.
  • the first and second blind holes 23, 24 are connected to one another by a coaxial connecting hole 29 of smaller diameter than the diameter of the first and second blind holes 23, 24.
  • the second blind bore 24 of the armature 27 receives the head 30 of a nozzle needle 31 in a non-positive or positive manner.
  • the nozzle needle 31 extends away from the armature 27 into a guide bore 33 of a nozzle body 34 which is partially inserted into a holding bore 35 of the valve housing 1 and is pressed by a flange 36 formed on the valve housing 1 against a stop plate 37 which is attached to one by the magnetic flux guide 25 formed inner shoulder 38 of the valve housing 1 abuts.
  • the nozzle needle 31 penetrates a through opening 41 in the stop plate 37 with a constriction section 40 and projects out of an injection opening 43 of the nozzle body 34 with a needle pin 42.
  • a conical valve seat surface 44 is formed, which cooperates with a conical sealing section 45 on the nozzle needle 31.
  • a recess 46 is provided between the passage opening 41 and the circumference of the stop plate 37, the clear width of which is larger than the diameter of the constricted section 40 of the nozzle needle 31.
  • the constriction section 40 is adjoined by a stop shoulder 48 of the nozzle needle 31, by means of which the nozzle needle rests on the stop plate 37 when the armature 27 is attracted when the solenoid coil is energized, the sealing section 45 having lifted off the valve seat 44 and fuel being sprayed off via the injection opening 43 can.
  • a first guide section 49 of the nozzle needle 31 adjoins the stop shoulder 48, to which a cylinder section 50 and a second guide section 51 adjoin.
  • the guide sections 49 and 51 give the nozzle needle 31 guidance in the guide bore 33 and are designed, for example, as a square to ensure a flow around the nozzle needle 31 up to the sealing section 45.
  • blind hole 55 which, aligned coaxially with the core 7, opens towards it.
  • an obliquely mounted bypass bore 56 opens, which on the other hand opens to the fuel chamber between the head 30 and the stop shoulder 48 of the nozzle needle 31 and wel che allows backflow of fuel to the fuel backflow line and flushing out unwanted vapor bubbles.
  • the diameter of the blind hole 55 is dimensioned such that a compression spring 57 can be supported on the end face of the head 30 of the valve needle 31 formed between the blind hole 55 and the connecting bore 29 of the armature 27, which is supported on the other hand on an end face of a bushing 60 fastened in the connecting piece and which strives to act on the valve needle 31 in the direction of the valve seat surface 44 and thus to close the valve.
  • the attachment of the socket 60 in the connector 11 is such. B. accomplished by a pronounced on the outer edge of the socket 60 tooth profile with longitudinal teeth.
  • a seal between the socket 60 and the connection piece 11 or core 7 is found only at the end of the socket 60 facing the armature 27, otherwise a flow in an annular gap 62 is possible over the entire length of the socket 60 between the socket 60 and the connection piece 11.
  • the socket 60 still ends within the connecting piece 11, which in turn is closed off on its end face by a sieve 61 designed as a cap.
  • the valve housing 1 in the area of the flange 10 and the connecting piece 11 over part of its length are surrounded by a plastic ring 65.
  • This has, inter alia, a plug 66 which receives a plug connection 67 connected to the contact lug 4.
  • an annular fuel guiding body 70 adjoins the plastic ring 65, likewise enclosing the connecting piece 11.
  • the fuel guide body 70 seals against the outer jacket of the connecting piece 11, while in the opposite direction, starting from an annular collecting channel 71 incorporated in the fuel guide body 70, a cylindrical gap 72 remains between the fuel guide body 70 and the connecting piece 11.
  • At least one first connecting channel 73 leads from the collecting channel 71 in the direction facing the armature 27 to likewise at least one sleeve 74, which runs parallel to the connecting piece and serves for the fuel supply.
  • This sleeve 74 sits on the one hand in a first receiving bore 75 of the fuel guide body 70, which is connected to the first Connection channel 73 is connected or is identical to it, and on the other hand in a similar, second receiving bore 76 in the flange 8 of the core 7.
  • the second receiving bore 76 is located in a second connecting channel 77, which preferably runs coaxially therewith, in this way a connection producing the magnetic coil 3 accommodating interior space 6.
  • the sleeve 74 is also enclosed by the plastic ring 65.
  • the annular gap 72 of the fuel guide body 70 is closed off by a fuel filter 80.
  • This fuel filter 80 is seated, with a filter holder 81 partially encompassing a rim 82 of the fuel guide body 70, with this filter holder 81 on the outer jacket of the connecting piece 11.
  • the flow through the fuel filter 80 is radial.
  • an annular groove 83 is machined, into which a first sealing ring 84 is inserted, which serves to seal the fuel guide body 70 against a connecting flange 85 which partially surrounds it.
  • a supply element 90 The supply of the magnetic injection valve with fuel and the return of excess fuel is ensured by a supply element 90.
  • This supply element 90 can be designed, for example, as a metal profile with an inlet tract 91 and a return tract 92, the inlet tract 91 having an inlet opening 93 and the return tract having a return opening 94.
  • the inlet opening 93 coaxially surrounds the return opening 94 in such a way that the inlet opening 93 is sealingly connected to the connecting flange 85, while the return opening 94 radially surrounds the connecting piece 11 at its end facing away from the armature 27.
  • a second sealing ring 95 can be located between the return opening 94 and the connecting piece 11 for sealing.
  • the coil carrier 2 accommodated in the interior 6 of the valve housing 1 and accommodating the magnet coil 3 has a smaller outside diameter than the diameter of the interior 6, so that fuel is washed around the magnet coil 4 or coil carrier 2 on its outer jacket.
  • the supply of fuel into the interior 6 of the valve housing 1 takes place in the manner already described above via the second connecting channel 77 in the flange 8.
  • radially running channels 96 In each flat side of the coil carrier 2, which, facing the magnetic flux guide shoulder 25, faces the nozzle body 34, is located radially running channels 96, which continue in the area of the inner bore of the coil carrier 2 as axial channels 97 over a certain length of the coil carrier 2.
  • Openings 98 made radially in the coil carrier 2 connect these axial channels 97 to an annular space 99 formed between the coil carrier 2 and the outer jacket of the core 7.
  • the individual radially extending channels 96 and the axial channels 97 can each be connected to one another via transverse channels.
  • the annular space 99 is in turn connected to the annular gap 62 between the connecting piece 11 and the socket 60 by at least one outlet opening 100.
  • the flow through the injection valve takes place after flowing through the fuel filter 80 via the annular gap 72 and through the sleeve 74 into the interior 6 and further via the radial channels 96 and the axial channels 97 via the openings 98 into the annular space 99 and via the outlet openings 100 in the between the connecting pieces 11 and bushing 60 are annular gap 62.
  • the fuel continues to flow in the direction facing away from the valve, is guided around at the end of bushing 60 and its end face and then flows through bushing 60 to armature 27.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem elektromagnetisch betätigbaren Kraftstoffeinspritzventil nach der Gattung des Hauptanspruchs. Es ist bereits ein Kraftstoffeinspritzventil bekannt, bei welchem der zum Ventilsitz strömende Kraftstoff zunächst die Magnetspule umströmt, einerseits um diese zu kühlen und andererseits um bei einer solchen Durchströmung des Kraftstoffeinspritzventils eventuell auftretende Dampfblasen in eine Rückströmleitung mitzuführen (GB-A-2 116 255).The invention relates to an electromagnetically actuated fuel injection valve according to the preamble of the main claim. A fuel injection valve is already known in which the fuel flowing to the valve seat first flows around the solenoid coil, on the one hand to cool it and on the other hand to carry vapor bubbles which may occur during such a flow through the fuel injection valve into a return flow line (GB-A-2 116 255).

Beim Heissstart der Verbrennungskraftmaschine kann es jedoch zu Schwierigkeiten in der Gemischanpassung kommen, da in den ersten Sekunden nach dem Start auch mit Kraftstoffdampfblasen durchsetzter Kraftstoff zum Ventilsitz gelangt. Dieser Kraftstoff kann durch seine ausgeprägte Zündunwilligkeit die Betriebsbereitschaft einer Brennkraftmaschine stark beeinträchtigen.When the internal combustion engine is started hot, difficulties can arise in the mixture adaptation, since fuel which has been mixed with fuel vapor bubbles also reaches the valve seat in the first seconds after the start. Due to its pronounced unwillingness to ignite, this fuel can severely impair the operational readiness of an internal combustion engine.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemässe Magneteinspritzventil mit den kennzeichnenden Merkmale des Hauptanspruchs hat demgegenüber den Vorteil, auch in den ersten, entscheidenden Sekunden nach dem Heissstart einen weitgehend dampfblasenfreien, zündfähigen Kraftstoff in den Ansaugtrakt einer Brennkraftmaschine einzuspritzen. Erreicht wird dies durch eine grosse, wärmeaufnehmende Oberfläche des vom Kraftstoff durchspülten Innenraums des Magneteinspritzventils. Durch zweimalige Umlenkung des Kraftstoffflusses zwischen Anschlussstutzen und Ventilsitz wird ausserdem die Menge des jederzeit im Ventil gespeicherten Dicksaftes (gemeint ist damit das Benzin ohne die leichtflüchtigen Bestandteile) erhöht und auf diese Weise die Verfügbarkeit dieses wichtigen Treibstoffes für die ersten Sekunden nach dem Heissstart sichergestellt.In contrast, the magnetic injection valve according to the invention with the characterizing features of the main claim has the advantage of injecting a largely vapor-bubble-free, ignitable fuel into the intake tract of an internal combustion engine even in the first decisive seconds after the hot start. This is achieved by a large, heat-absorbing surface of the interior of the magnetic injector, which is flushed with fuel. By redirecting the fuel flow between the connecting piece and the valve seat, the amount of thick juice stored in the valve at all times (meaning the gasoline without the volatile components) is increased, thus ensuring the availability of this important fuel for the first seconds after the hot start.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Bei dem in der Zeichnung dargestellten Magneteinspritzventil zur Einsprizung von Kraftstoff, vorzugsweise in den Ansaugtrakt einer gemischverdichtenden Brennkraftmaschine, ist mit 1 ein in erster Näherung topfförmiges Ventilgehäuse bezeichnet, in dem auf einem Spulenträger 2 eine Magnetspule 3 angeordnet ist. Zur Stromzuführung besitzt die Magnetspule 3 eine Kontaktfahne 4, welche aus Magnetspule 3 und Spulenträger 2 herausführt. Der Spulenträger 2 der Magnetspule 3 sitzt in einem Innenraum 6 des Ventilgehäuses 1 auf einem Kern 7, derteilweise in den Innenraum 6 des Ventilgehäuses 1 ragt und mit einem Flansch 8 den Innenraum 6 abschliesst. Der Flansch 8 sitzt einerseits auf einem Absatz 9 des Ventilgehäuses 1 auf und wird andererseits durch eine Bördelung 10 des Ventilgehäuses 1 teilweise umfasst und durch diese Bördelung 10 gegen den Absatz 9 gepresst. Der Kern 7 setzt sich auf der der Magnetspule 3 abgewandten Seite des Flansches 8 in einem Anschlussstutzen 11 fort. Dem Flansch 8 des Kerns 7 abgewandt wird der Innenraum 6 des Ventilgehäuses 1 durch einen Magnetflussleitabsatz 25 des Ventilgehäuses 1 begrenzt, der sich radial nach innen erstreckt und fluchtend zum Kern 7 eine Durchgangsbohrung 26 aufweist. Der Spulenträger 2 sitzt auf dem Magnetflussleitabsatz 25 auf. Auf den Kern 7 ausgerichtet ragt mit geringem Spiel ein ringförmig ausgebildeter Anker 27 in die Durchgangsbohrung 26 des Magnetflussleitabsatzes. Der Anker 27 weist eine auf den Kern 7 ausgerichtete erste Sackbohrung 23 sowie eine koaxial zur ersten Sackbohrung 23 und zur Ventilachse ausgerichtete, dem Kern 7 abgewandte zweite Sackbohrung 24 auf. Die erste und zweite Sackbohrung 23, 24 werden durch eine koaxiale Verbindungsbohrung 29 kleineren Durchmessers als der Durchmesser von erster und zweiten Sackbohrung 23, 24 miteinander verbunden. Die zweite Sackbohrung 24 des Ankers 27 nimmt den Kopf 30 einer Düsennadel 31 kraft-oder formschlüssig auf. Die Düsennadel 31 erstreckt sich dem Anker 27 abgewandt in eine Führungsbohrung 33 eines Düsenkörpers 34, der teilweise in eine Haltebohrung 35 des Ventilgehäuses 1 eingesetzt ist und durch eine am Ventilgehäuse 1 ausgebildete Bördelung 36 gegen eine Anschlagplatte 37 gepresst wird, die an einer durch den Magnetflussleitabsatz 25 gebildeten Innenschulter 38 des Ventilgehäuses 1 anliegt. Die Düsennadel 31 durchdringt mit einem Einschnürungsabschnitt 40 eine Durchgangsöffnung 41 in der Anschlagplatte 37 und ragt mit einem Nadelzapfen 42 aus einer Einspritzöffnung 43 des Düsenkörpers 34 heraus. Zwischen der Führungsbohrung 33 des Düsenkörpers 34 und der Einspritzöffnung 43 ist eine kegelige Ventilsitzfläche 44 ausgebildet, die mit einem kegeligen Dichtabschnitt 45 an der Düsennadel 31 zusammenwirkt. Zwischen der Durchgangsöffnung 41 und dem Umfang der Anschlagplatte 37 ist eine Aussparung 46 vorgesehen, deren lichte Weite grösser als der Durchmesser des Einschnürungsabschnittes 40 der Düsennadel 31 ist. An den Einschnürungsabschnitt 40 schliesst sich eine Anschlagschulter 48 der Düsennadel 31 an, mit der die Düsennadel bei im erregten Zustand der Magnetspule angezogenem Anker 27 an der Anschlagplatte 37 anliegt, wobei der Dichtabschnitt 45 vom Ventilsitz 44 abgehoben hat und Kraftstoff über die Einspritzöffnung 43 abgespritzt werden kann. An die Anschlagschulter 48 schliesst sich ein erster Führungsabschnitt 49 der Düsennadel 31 an, an den sich ein Zylinderabschnitt 50 und ein zweiter Führungsabschnitt 51 anschliessen. Die Führungsabschnitte 49 und 51 geben der Düsennadel 31 in der Führungsbohrung 33 Führung und sind beispielsweise als Vierkante ausgebildet, um eine Umströmung der Düsennadel 31 bis zum Dichtabschnitt 45 zu gewährleisten.In the magnetic injection valve shown in the drawing for injecting fuel, preferably into the intake tract of a mixture-compressing internal combustion engine, 1 denotes, in a first approximation, a pot-shaped valve housing, in which a magnet coil 3 is arranged on a coil carrier 2. To supply power, the magnet coil 3 has a contact lug 4, which leads out of the magnet coil 3 and the coil carrier 2. The coil carrier 2 of the magnet coil 3 is seated in an interior 6 of the valve housing 1 on a core 7, which partly projects into the interior 6 of the valve housing 1 and closes the interior 6 with a flange 8. The flange 8 is seated on the one hand on a shoulder 9 of the valve housing 1 and on the other hand is partially surrounded by a flange 10 of the valve housing 1 and pressed against the paragraph 9 by this flange 10. The core 7 continues on the side of the flange 8 facing away from the magnet coil 3 in a connecting piece 11. Facing away from the flange 8 of the core 7, the interior 6 of the valve housing 1 is delimited by a magnetic flux guide shoulder 25 of the valve housing 1, which extends radially inwards and has a through hole 26 in alignment with the core 7. The coil carrier 2 is seated on the magnetic flux guide paragraph 25. Aligned to the core 7, a ring-shaped armature 27 projects into the through bore 26 of the magnetic flux guide shoulder with little play. The armature 27 has a first blind bore 23 aligned with the core 7 and a second blind bore 24 facing away from the core 7 and coaxial with the first blind bore 23 and the valve axis. The first and second blind holes 23, 24 are connected to one another by a coaxial connecting hole 29 of smaller diameter than the diameter of the first and second blind holes 23, 24. The second blind bore 24 of the armature 27 receives the head 30 of a nozzle needle 31 in a non-positive or positive manner. The nozzle needle 31 extends away from the armature 27 into a guide bore 33 of a nozzle body 34 which is partially inserted into a holding bore 35 of the valve housing 1 and is pressed by a flange 36 formed on the valve housing 1 against a stop plate 37 which is attached to one by the magnetic flux guide 25 formed inner shoulder 38 of the valve housing 1 abuts. The nozzle needle 31 penetrates a through opening 41 in the stop plate 37 with a constriction section 40 and projects out of an injection opening 43 of the nozzle body 34 with a needle pin 42. Between the guide bore 33 of the nozzle body 34 and the injection opening 43, a conical valve seat surface 44 is formed, which cooperates with a conical sealing section 45 on the nozzle needle 31. A recess 46 is provided between the passage opening 41 and the circumference of the stop plate 37, the clear width of which is larger than the diameter of the constricted section 40 of the nozzle needle 31. The constriction section 40 is adjoined by a stop shoulder 48 of the nozzle needle 31, by means of which the nozzle needle rests on the stop plate 37 when the armature 27 is attracted when the solenoid coil is energized, the sealing section 45 having lifted off the valve seat 44 and fuel being sprayed off via the injection opening 43 can. A first guide section 49 of the nozzle needle 31 adjoins the stop shoulder 48, to which a cylinder section 50 and a second guide section 51 adjoin. The guide sections 49 and 51 give the nozzle needle 31 guidance in the guide bore 33 and are designed, for example, as a square to ensure a flow around the nozzle needle 31 up to the sealing section 45.

Im Kopf 30 der Düsennadel 31 ist ein Sackloch 55 vorgesehen, welches sich, koaxial zum Kern 7 ausgerichtet, zu diesem hin öffnet. Am Boden des Sackloches 55 mündet eine schräg angebrachte Bypassbohrung 56, welche sich andererseits zum Kraftstoffraum zwischen dem Kopf 30 und der Anschlagschulter 48 der Düsennadel 31 hin öffnet und welche eine Rückströmung von Kraftstoff zur Kraftstoffrückströmleitung und eine Ausspülung unerwünschter Dampfblasen erlaubt. Der Durchmesser des Sackloches 55 ist so bemessen, dass sich auf der zwischen Sackloch 55 und Verbindungsbohrung 29 des Ankers 27 gebildeten Stirnfläche des Kopfes 30 der Ventilnadel 31 eine Druckfeder 57 abstützen kann, welche sich andererseits an einer Stirnfläche einer im Anschlussstutzen befestigten Buchse 60 abstützt und welche bestrebt ist, die Ventilnadel 31 in Richtung auf die Ventilsitzfläche 44 zu beaufschlagen und damit das Ventil zu schliessen. Die Befestigung der Buchse 60 im Anschlussstutzen 11 wird z. B. durch ein am Aussenrand der Buchse 60 ausgeprägtes Zahnprofil mit längs verlaufenden Zähnen bewerkstelligt. Eine Abdichtung zwischen Buchse 60 und Anschlussstutzen 11 bzw. Kern 7 findet sich nur an dem dem Anker 27 zugewandten Ende der Buchse 60, ansonsten ist auf der gesamten Länge der Buchse 60 zwischen dieser und dem Anschlussstutzen 11 eine Durchströmung in einem Ringspalt 62 möglich. In dem Anker 27 abgewandter Richtung endet die Buchse 60 noch innerhalb des Anschlussstutzens 11, welcher seinerseits durch ein als Kappe ausgebildetes Sieb 61 an seiner Stirnseite abgeschlossen wird.In the head 30 of the nozzle needle 31 there is a blind hole 55 which, aligned coaxially with the core 7, opens towards it. At the bottom of the blind hole 55, an obliquely mounted bypass bore 56 opens, which on the other hand opens to the fuel chamber between the head 30 and the stop shoulder 48 of the nozzle needle 31 and wel che allows backflow of fuel to the fuel backflow line and flushing out unwanted vapor bubbles. The diameter of the blind hole 55 is dimensioned such that a compression spring 57 can be supported on the end face of the head 30 of the valve needle 31 formed between the blind hole 55 and the connecting bore 29 of the armature 27, which is supported on the other hand on an end face of a bushing 60 fastened in the connecting piece and which strives to act on the valve needle 31 in the direction of the valve seat surface 44 and thus to close the valve. The attachment of the socket 60 in the connector 11 is such. B. accomplished by a pronounced on the outer edge of the socket 60 tooth profile with longitudinal teeth. A seal between the socket 60 and the connection piece 11 or core 7 is found only at the end of the socket 60 facing the armature 27, otherwise a flow in an annular gap 62 is possible over the entire length of the socket 60 between the socket 60 and the connection piece 11. In the armature 27 facing away from it, the socket 60 still ends within the connecting piece 11, which in turn is closed off on its end face by a sieve 61 designed as a cap.

Das Ventilgehäuse 1 im Bereich der Bördelung 10 und der Anschlussstutzen 11 auf einem Teil seiner Länge sind durch einen Kunststoffring 65 umgeben. Dieser weist unter anderem einen Stecker 66 auf, welcher einen mit der Kontaktfahne 4 verbundenen Steckanschluss 67 aufnimmt. In dem Anker 27 abgewandter Richtung schliesst sich an den Kunststoffring 65, ebenfalls den Anschlussstutzen 11 umschliessend, ein ringförmiger Kraftstoffleitkörper 70 an. In seinem dem Kunststoffring 65 zugewandten Bereich dichtet der Kraftstoffleitkörper 70 gegen den Aussenmantel des Anschlussstutzens 11 ab, während in entgegengesetzter Richtung, von einem im Kraftstoffleitkörper 70 eingearbeiteten ringförmigen Sammelkanal 71 ausgehend, zwischen Kraftstoffleitkörper 70 und Anschlussstutzen 11 ein zylindrischer Spalt 72 verbleibt. Von dem Sammelkanal 71 führt in dem Anker 27 zugewandter Richtung mindestens ein erster Verbindungskanal 73 zu ebenfalls mindestens einer, achsparallel zum Anschlussstutzen verlaufenden, der Kraftstoffzufuhr dienenden Hülse 74. Diese Hülse 74 sitzt einerseits in einer ersten Aufnahmebohrung 75 des Kraftstoffleitkörpers 70, welche mit dem ersten Verbindungskanal 73 in Verbindung steht oder mit diesem identisch ist, und andererseits in einer ähnlichen, zweiten Aufnahmebohrung 76 in dem Flansch 8 des Kerns 7. Die zweite Aufnahmebohrung 76 setzt sich in einem vorzugsweise koaxial hierzu verlaufenden zweiten Verbindungskanal 77, auf diese Weise eine Verbindung zum die Magnetspule 3 aufnehmenden Innenraum 6 herstellend, fort. Vorteilhafterweise ist die Hülse 74 ebenfalls durch den Kunststoffring 65 umschlossen. In dem Anker 27 abgewandter Richtung wird der Ringspalt 72 des Kraftstoffleitkörpers 70 durch einen Kraftstoffilter 80 abgeschlossen. Dieser Kraftstoffilter 80 sitzt, mit einem Filterhalter 81 einen Bord 82 des Kraftstoffleitkörpers 70 teilweise umgreifend, mit diesem Filterhalter 81 auf dem Aussenmantel des Anschlussstutzens 11 auf. Die Durchströmung des Kraftstoffilters 80 erfolgt dabei radial. Im Aussenmantel des Kraftstoffleitkörpers 70 ist eine ringförmige Nut 83 eingearbeitet, in welche ein erster Dichtring 84 eingelegt ist, welcher dazu dient, den Kraftstoffleitkörper 70 gegen einen diesen teilweise umfassenden Anschlussflansch 85 abzudichten.The valve housing 1 in the area of the flange 10 and the connecting piece 11 over part of its length are surrounded by a plastic ring 65. This has, inter alia, a plug 66 which receives a plug connection 67 connected to the contact lug 4. In the direction facing away from the armature 27, an annular fuel guiding body 70 adjoins the plastic ring 65, likewise enclosing the connecting piece 11. In its area facing the plastic ring 65, the fuel guide body 70 seals against the outer jacket of the connecting piece 11, while in the opposite direction, starting from an annular collecting channel 71 incorporated in the fuel guide body 70, a cylindrical gap 72 remains between the fuel guide body 70 and the connecting piece 11. At least one first connecting channel 73 leads from the collecting channel 71 in the direction facing the armature 27 to likewise at least one sleeve 74, which runs parallel to the connecting piece and serves for the fuel supply. This sleeve 74 sits on the one hand in a first receiving bore 75 of the fuel guide body 70, which is connected to the first Connection channel 73 is connected or is identical to it, and on the other hand in a similar, second receiving bore 76 in the flange 8 of the core 7. The second receiving bore 76 is located in a second connecting channel 77, which preferably runs coaxially therewith, in this way a connection producing the magnetic coil 3 accommodating interior space 6. Advantageously, the sleeve 74 is also enclosed by the plastic ring 65. In the armature 27 facing away from it, the annular gap 72 of the fuel guide body 70 is closed off by a fuel filter 80. This fuel filter 80 is seated, with a filter holder 81 partially encompassing a rim 82 of the fuel guide body 70, with this filter holder 81 on the outer jacket of the connecting piece 11. The flow through the fuel filter 80 is radial. In the outer jacket of the fuel guide body 70, an annular groove 83 is machined, into which a first sealing ring 84 is inserted, which serves to seal the fuel guide body 70 against a connecting flange 85 which partially surrounds it.

Die Versorgung des Magneteinspritzventils mit Kraftstoff sowie die Rückführung überschüssigen Kraftstoffes wird durch ein Versorgungsorgan 90 sichergestellt. Dieses Versorgungsorgan 90 kann beispielsweise als Metallprofil mit einem Zulauftrakt 91 und einem Rücklauftrakt 92 ausgeführt sein, wobei der Zulauftrakt 91 eine Zulauföffnung 93 und der Rücklauftrakt eine Rücklauföffnung 94 aufweist. Die Zulauföffnung 93 umschliesst koaxial die Rücklauföffnung 94 in der Weise, dass die Zulauföffnung 93 dichtend mit dem Anschlussflansch 85 verbunden ist, während die Rücklauföffnung 94 den Anschlussstutzen 11 an seinem dem Anker 27 abgewandten Ende radial umfasst. Zur Abdichtung kann sich zwischen Rücklauföffnung 94 und Anschlussstutzen 11 ein zweiter Dichtring 95 befinden.The supply of the magnetic injection valve with fuel and the return of excess fuel is ensured by a supply element 90. This supply element 90 can be designed, for example, as a metal profile with an inlet tract 91 and a return tract 92, the inlet tract 91 having an inlet opening 93 and the return tract having a return opening 94. The inlet opening 93 coaxially surrounds the return opening 94 in such a way that the inlet opening 93 is sealingly connected to the connecting flange 85, while the return opening 94 radially surrounds the connecting piece 11 at its end facing away from the armature 27. A second sealing ring 95 can be located between the return opening 94 and the connecting piece 11 for sealing.

Der in dem Innenraum 6 des Ventilgehäuses 1 untergebrachte, die Magnetspule 3 aufnehmende Spulenträger 2 weist einen geringeren Aussendurchmesser auf, als der Durchmesser des Innenraums 6, so dass Magnetspule 4 bzw. Spulenträger 2 an ihrem Aussenmantel von Kraftstoff umspült werden. Die Zufuhr von Kraftstoff in den Innenraum 6 des Ventilgehäuses 1 erfolgt dabei in oben bereits beschriebener Weise über den zweiten Verbindungskanal 77 im Flansch 8. In jeder Flachseite des Spulenträgers 2, welche, am Magnetflussleitabsatz 25 anliegend, dem Düsenkörper 34 zugewandt ist, befinden sich radial verlaufende Kanäle 96, welche sich im Bereich der Innenbohrung des Spulenträgers 2 als Axialkanäle 97 auf bestimmter Länge des Spulenträgers 2 fortsetzen. Radial im Spulenträger 2 angebrachte Öffnungen 98 verbinden diese Axialkanäle 97 mit einem zwischen Spulenträger 2 und Aussenmantel des Kerns 7 gebildeten Ringraum 99. Die einzelnen radial verlaufenden Kanäle 96 sowie die Axialkanäle 97 können untereinander jeweils über Querkanäle verbunden sein. Der Ringraum 99 wiederum ist mit dem zwischen Anschlussstutzen 11 und Buchse 60 liegenden Ringspalt 62 durch mindestens eine Austrittsöffnung 100 verbunden.The coil carrier 2 accommodated in the interior 6 of the valve housing 1 and accommodating the magnet coil 3 has a smaller outside diameter than the diameter of the interior 6, so that fuel is washed around the magnet coil 4 or coil carrier 2 on its outer jacket. The supply of fuel into the interior 6 of the valve housing 1 takes place in the manner already described above via the second connecting channel 77 in the flange 8. In each flat side of the coil carrier 2, which, facing the magnetic flux guide shoulder 25, faces the nozzle body 34, is located radially running channels 96, which continue in the area of the inner bore of the coil carrier 2 as axial channels 97 over a certain length of the coil carrier 2. Openings 98 made radially in the coil carrier 2 connect these axial channels 97 to an annular space 99 formed between the coil carrier 2 and the outer jacket of the core 7. The individual radially extending channels 96 and the axial channels 97 can each be connected to one another via transverse channels. The annular space 99 is in turn connected to the annular gap 62 between the connecting piece 11 and the socket 60 by at least one outlet opening 100.

Die Durchströmung des Einspritzventils erfolgt nach Durchfliessen des Kraftstoffilters 80 über Ringspalt 72 und durch die Hülse 74 in den Innenraum 6 und weiter über die radialen Kanäle 96 sowie die Axialkanäle 97 über die Öffnungen 98 in den Ringraum 99 und über die Austrittsöffnungen 100 in den zwischen Anschlussstutzen 11 und Buchse 60 liegenden Ringspalt 62. Hier fliesst der Kraftstoff in ventilabgewandter Richtung weiter, wird am Ende der Buchse 60 un deren Stirnfläche herumgeführt und fliesst dann durch die Buchse 60 hindurch zum Anker 27.The flow through the injection valve takes place after flowing through the fuel filter 80 via the annular gap 72 and through the sleeve 74 into the interior 6 and further via the radial channels 96 and the axial channels 97 via the openings 98 into the annular space 99 and via the outlet openings 100 in the between the connecting pieces 11 and bushing 60 are annular gap 62. Here the fuel continues to flow in the direction facing away from the valve, is guided around at the end of bushing 60 and its end face and then flows through bushing 60 to armature 27.

Eventuell im Kraftstoff gelöste Dampfblasen und leichterflüchtige Anteile werden durch die zentrale Bohrung der Buchse 60 hindurch zum Rücklauftrakt 92 des Versorgungsorgans 90 transportiert.Any vapor bubbles and more volatile components dissolved in the fuel are transported through the central bore of the bushing 60 to the return tract 92 of the supply member 90.

Durch die zweimalige Umlenkung des Kraftstoffes auf dem Weg vom Versorgungsorgan 90 zum Düsenkörper 34 unter gezielter Umströmung der Magnetspule 3 wird eine sehr gute Kühlung des Ventils bei einer grossen wärmeübertragenden Oberfläche erreicht. Durch das grosse Volumen des innerhalb des Ventils gebundenen, überwiegend dickflüssigen Kraftstoffes ist beim Heissstart der Brennkraftmaschine ein grosser Vorrat an gut zerstäubbarem Dicksaft vorhanden. Dieser Vorrat bietet eine ausreichende Reserve für die ersten kritischen Sekunden während der Heissstartphase.By deflecting the fuel twice on the way from the supply member 90 to the nozzle body 34 with targeted flow around the magnet coil 3, very good cooling of the valve is achieved with a large heat-transferring surface. Due to the large volume of the predominantly viscous fuel bound within the valve, when the internal combustion engine is started hot, a large supply of easily atomizable thick juice is available. This supply provides a sufficient reserve for the first critical seconds during the hot start phase.

Claims (12)

1. Magnetic injection valve, especially for the injection of fuel into the intake tract of a mixture-compressing internal-combustion engine, with a valve housing (1), a hollow fuel-conveying core (7) interacting with an armature (27) and produced from ferromagnetic material, a magnet coil (3) which is fastened on a coil form (2) and through which at least part of the core (7) passes axially and which is located in an inner space (6) of the valve housing through which fuel flows, a bush (60) which is arranged within the core (7) and forms an annular gap (62) between itself and the core (7) and which rests sealingly in the core (7) at its end facing the armature (27), and at least one orifice (100) connecting the annular gap (62) to the inner space (6) and located at the end of the annular gap (62) on the same side as the armature, characterized in that the inner space (6) is connected, via at least on channel preferably formed by a sleeve (74), to a feed tract (91) of a supply member (90) serving for supplying fuel to the magnetic injection valve, and in that the annular gap (62) and the interior of the bush (60) open, at the other common end facing away from the armature (27), into a fuel return (92) leading away from the magnetic injection valve, the interior of the bush (60) serving as a fuel feed to the armature (27).
2. Magnetic injection valve according to Claim 1, characterized in that the connection between the orifice (100) and the inner space (6) is made only when there is a virtually complete flow round the magnet coil (3).
3. Magnetic injection valve according to Claim 2, characterized in that channels are fashioned in the coil form (2) for the purpose of a flow round the magnet coil (3).
4. Magnetic injection valve according to Claim 3, characterized in that radially extending channels (96) are fashioned in that flat side of the coil form (2) which faces away from the supply member (90).
5. Magnetic injection valve according to Claim 4, characterized in that the radially extending channels (96) are connected to one another by means of transverse channels.
6. Magnetic injection valve according to one of Claims 3 to 5, characterized in that axially extending channels (97) are fashioned in the inner face of the coil form (2) resting against the core (60).
7. Magnetic injection valve according to Claim 6, characterized in that the axially extending channels (97) are connected to one another by means of transverse channels.
8. Magnetic injection valve according to one of the preceding claims, characterized in that, as seen in the direction of the supply member (90), the bush (60) terminates below the core (7).
9. Magnetic injection valve according to Claim 8, characterized in that a sieve (61) is fastened to the end of the core (7) facing away from the magnet coil (3).
10. Magnetic injection valve according to one of the preceding claims, characterized in that there rests on the core (7) a fuel-conveying body (70) which is designed as a cylindrical body and which has off-centre, in its end face facing the magnet coil (3), a receiving bore (75) receiving part of the sleeve (74) and has a collecting channel (71) which is connected to the receiving bore (75) and surrounds the core (7) in the form of a ring and from which a cylindrical gap (72) formed between the fuel-conveying body (70) and core (7) opens out in a direction facing away from the valve.
11. Magnetic injection valve according to Claim 10, characterized in that, resting against the end face of the fuel-conveying body (70) facing the supply member (90), there is a fuel filter (80) which at the same time partielly surrounds the core (7) and through which the fuel flows radially.
EP86112189A 1985-10-02 1986-09-03 Electromagnetically actuated fuel injector Expired EP0222997B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853535124 DE3535124A1 (en) 1985-10-02 1985-10-02 ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE
DE3535124 1985-10-02

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EP0222997A1 EP0222997A1 (en) 1987-05-27
EP0222997B1 true EP0222997B1 (en) 1988-12-07

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JP (1) JPS6287662A (en)
DE (2) DE3535124A1 (en)

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US4700891A (en) 1987-10-20
DE3535124A1 (en) 1987-04-02
DE3661371D1 (en) 1989-01-12
JPS6287662A (en) 1987-04-22
EP0222997A1 (en) 1987-05-27

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