EP0200865A1 - Injection valve - Google Patents

Injection valve Download PDF

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Publication number
EP0200865A1
EP0200865A1 EP86102633A EP86102633A EP0200865A1 EP 0200865 A1 EP0200865 A1 EP 0200865A1 EP 86102633 A EP86102633 A EP 86102633A EP 86102633 A EP86102633 A EP 86102633A EP 0200865 A1 EP0200865 A1 EP 0200865A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection valve
armature
valve
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.)
Withdrawn
Application number
EP86102633A
Other languages
German (de)
French (fr)
Inventor
Eckhart Kern
Reiner Weingärtner
Jürgen Luft
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.)
Mannesmann VDO AG
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Mannesmann VDO AG
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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0200865A1 publication Critical patent/EP0200865A1/en
Withdrawn legal-status Critical Current

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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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0646—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube
    • F02M51/065—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube the valve being spherical or partly spherical
    • 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
    • F02M51/0667—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 acting as a valve or having a short valve body attached thereto
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices

Definitions

  • the invention relates to an injection valve, in particular for fuel injection systems of internal combustion engines, with a magnetic winding, a magnetic core, an armature which is connected to a movable valve part which cooperates with a valve seat, and with means for generating a swirl when the fuel is to be injected .
  • Electromagnetically actuated injection valves are already known, in which means are provided for generating a swirl in the fuel to be injected. These means consist in that oblique bores are provided in the nozzle body forming the valve seat, which impart a tangential speed component to the escaping fuel.
  • the object of the present invention is to improve the atomization of the fuel and at the same time to prevent contamination of means for generating a swirl.
  • valve is part of a fuel circuit and that the means for generating the swirl are arranged such that they are in the fuel circuit and fuel flows through them even when the injection valve is closed.
  • This inventive design of the injection valve ensures that a swirl movement is constantly maintained by the continuous flow and does not have to be built up only when the valve is opened. There is also the advantage that contamination of the swirl channels is avoided.
  • a magnetic core consisting of an upper core part 2 and a lower core part 3 is held concentrically in a cup-shaped housing 1.
  • the upper core part 2 is designed in the manner of a shell core made of soft magnetic material and is centered at the top by a shoulder 4 within the housing 1. While the lower centering of the upper core part 2 and the lower core part 3 is carried out by a plurality of beads 5 distributed around the circumference of the housing 1.
  • Both the housing 1 and the upper core part have a flange-like edge.
  • all of the inner parts are first inserted into the valve and then the flange-like edges of the upper core part 2 and the housing are fixed by flanging the cover 11 and thus the injection valve is closed.
  • the magnetic coil 7 is arranged on the coil carrier 6, preferably made of plastic, within the upper core part.
  • the electrical connections 8 of the magnetic coil are guided to the outside in a tubular continuation 9 of the coil carrier 6, an annular seal 10 being provided between the cover 11 of the injection valve and the upper core part 2.
  • a guide bushing 12 made of non-magnetizable material for the armature 13 is inserted into a cylindrical bore of the lower core part 3.
  • the armature 13 consists of a substantially cylindrical part 14, which ver on the circumference has divided flats 15 so that fuel can flow past the anchor, as will be described in detail later.
  • the non-flattened parts 16 of the peripheral surface serve as sliding surfaces of the armature.
  • At the lower end of the armature is the movable valve part 17, which is conical.
  • the conical part of the movable valve part acts together with the valve seat 18 which, like the guide sleeve 12, is inserted concentrically into the lower core part 3.
  • the armature 13 is pressed against the valve seat 18 by a compression spring 19.
  • the compression spring 19 is supported on a bearing part 21 which is pressed into a central bore 20 of the upper core part 2.
  • the lid 11 is formed in the middle part as a housing for a further compression spring 22, which is part of a pressure regulator, which further consists of a membrane 23 and two disks 24, 25, which together with a sleeve 26 form a valve.
  • the fuel supplied at 27 initially reaches the outer space 28 of the injection valve. From there it flows through the swirl channels 29 into the inner space of the lower core part 3.
  • a swirl is already generated in this way, in contrast to the known injection valves with swirl devices.
  • the fuel is guided past the armature through bores 30, 31 in the inner part 32 of the upper core part 2 and passes through the intermediate space 37 between the coil carrier 6 and the inner core part 32 and through a throttle point 33 to the bore 34, which forms the return of the fuel.
  • paragraph 4 of the upper core part is formed obliquely.
  • the vapor bubbles then migrate via the channel 36 to the pressure regulator without getting into the other cavities of the injection valve and are fed from there to the fuel return.
  • the armature 13 moves upwards under the action of the magnetic lines of force.
  • a ring 37 made of non-magnetic material is provided so that it does not stick to the inner part 32 of the upper core part 2 after the current has been switched off again.
  • FIG. 2 shows a cross section through the injection valve according to FIG. 1 in the plane labeled AB in FIG. 1.
  • the lower core part 3 can be seen with four swirl channels which open tangentially into the inner cavity of the lower core part.
  • the area of the throttle point 33 can also be matched to the area of the spraying point in such a way that there is an optimal pressure at the spraying point for spraying.
  • a valve is shown in FIG. 3, which also has a flat armature in contrast to the injection valve according to FIG. 1.
  • the cover 11, the pressure regulator 22, 23, 24, 25, 26, the coil support 6 and the magnet coil 7 and their parts 8, 9, 10 for current supply are constructed in accordance with the injection valve according to FIG. 1 and therefore do not need to be explained again. to become.
  • 3 is also cup-shaped and has a concentric opening 41 in the base plate. In the lower part of the housing wall there are beads 42 for centering the parts described below.
  • the magnetic core 43 is made of soft magnetic material in the form of a shell core and has a shoulder 44 in its upper part for centering. The lower part is centered by the beads 42.
  • a non-magnetizable circular ring element 46 is inserted, which in the axial direction extends beyond the magnetic core 43 so that the armature 47 does not "stick" to the magnetic core 43.
  • the anchor is stamped in the form shown in FIG. 3 and has a multiplicity of bores in order to facilitate the passage of the fuel.
  • the spherical segment-shaped movable valve part 48 is connected to the armature 47 in a form-fitting manner. It has a bore 49 in which a compression spring 50 engages. On the side facing away from the movable valve part, the compression spring is mounted in a part 52 which is pressed into a bore 51 of the inner core part. The spring 50 presses the movable valve member 48 against a seat member 53 which is made of hard material to reduce wear.
  • a membrane 54 used to center the movable valve part 48 is clamped on its outer edge between a spacer ring 55 and a disk-shaped element 56. Both the membrane 54, as well as the spacer ring 55 and the element 56 are centered by the beads 42 during the assembly of the injection valve.
  • the disc-shaped element 56 serves to separate the outer cavity 57 from the inner cavity 58 of the valve. Swirl grooves 59 connect the two cavities to one another.
  • the fuel led from the inlet 60 through the outer cavity 57 passes through the swirl grooves 49 and generates a swirl around the movable valve part 48. Fuel then flows in the internal cavity 58 around the solenoid through the throttle place 61 and the bore 62 to the return 63.
  • the armature 47 By supplying electric current to the solenoid 7, the armature 47 is moved in the direction of the magnetic core 43 against the tension of the compression spring 50. This opens the ejection opening. The fuel in the swirl is atomized out of the swirl immediately at the beginning of the injection process.
  • FIG. 4 shows a cross section in the plane drawn with AB in FIG. 3.
  • Four swirl grooves 49 are arranged in the disc-shaped element 56.
  • the housing 40 is provided with centering beads 42.
  • the section in the plane CD shown in FIG. 5 (FIG. 3) shows a part of the housing 40 and the membrane 54.

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

Abstract

In an injection valve, in particular for fuel injection systems of internal-combustion engines, having a magnet winding (7), a magnet core (2, 3) and an armature (13) which is connected to a movable valve part (17) which interacts with a valve seat (18), means (29) for producing a swirl within the injection valve are arranged in such a way that they lie in the fuel circuit and that fuel flows through them even when the injection valve is closed. Good atomisation of the fuel is thereby achieved immediately at the beginning of each injection process. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Einspritzventil, insbesondere für Kraftstoff-Einspritzanlagen von Brennkraftmaschinen, mit einer Magnetwicklung, einem Magnetkern, einem Anker, welcher mit einem beweglichen Ventilteil verbunden ist, das mit einem Ventilsitz zusammenwirkt, und mit Mittel zur Erzeugung eines Dralls beim einzuspritzenden Kraftstoff. Es sind bereits elektromagnetisch betätigbare Einspritzventile bekannt, bei welchen Mittel zur Erzeugung eines Dralls beim einzuspritzenden Kraftstoff vorgesehen sind. Diese Mittel bestehen darin, daß in dem den Ventilsitz bildenden Düsenkörper schrägverlaufende Bohrungen vorgesehen sind, welche dem austretenden Kraftstoff eine tangentiale Geschwindigkeitskomponente erteilen.The invention relates to an injection valve, in particular for fuel injection systems of internal combustion engines, with a magnetic winding, a magnetic core, an armature which is connected to a movable valve part which cooperates with a valve seat, and with means for generating a swirl when the fuel is to be injected . Electromagnetically actuated injection valves are already known, in which means are provided for generating a swirl in the fuel to be injected. These means consist in that oblique bores are provided in the nozzle body forming the valve seat, which impart a tangential speed component to the escaping fuel.

Diese bekannten Einspritzventile haben jedoch den Nachteil, daß durch die Anordnung der Drallkanäle ein Verschmutzen während der Schließphasen des Einspritzventils von außen her möglich ist. Ferner ist bei den bekannten Einspritzventilen nachteilig, daß sich der Drall bei jedem Öffnungsvorgang erneut aufbauen muß.However, these known injection valves have the disadvantage that, due to the arrangement of the swirl channels, they become dirty during the closing phases of the one spray valve from the outside is possible. A further disadvantage of the known injection valves is that the swirl has to build up again with each opening process.

Aufgabe der vorliegenden Erfindung ist es, die Zerstäubung des Kraftstoffs zu verbessern und gleichzeitig eine Verschmutzung von Mitteln zur Erzeugung eines Dralls zu verhindern.The object of the present invention is to improve the atomization of the fuel and at the same time to prevent contamination of means for generating a swirl.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Innenraum des Ventils Teil eines Kraftstoff-Kreislaufs ist und daß die Mittel zur Erzeugung des Dralls derart angeordnet sind, daß sie im Kraftstoff-Kreislauf liegen und auch bei geschlossenem Einspritzventil von Kraftstoff durchströmt werden.This object is achieved in that the interior of the valve is part of a fuel circuit and that the means for generating the swirl are arranged such that they are in the fuel circuit and fuel flows through them even when the injection valve is closed.

Durch diese erfindungsgemäße Gestaltung des Einspritzventils wird erreicht, daß durch die kontinuierliche Durchströmung eine Drallbewegung ständig aufrechterhalten wird und nicht erst beim Öffnen des Ventils aufgebaut werden muß. Außerdem besteht der Vorteil, daß eine Verschmutzung der Drallkanäle vermieden wird.This inventive design of the injection valve ensures that a swirl movement is constantly maintained by the continuous flow and does not have to be built up only when the valve is opened. There is also the advantage that contamination of the swirl channels is avoided.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zwei davon sind schematisch in der Zeichnung an Hand mehrerer Figuren dargestellt und nachfolgend beschrieben. Es zeigt:

  • Fig. 1 ein erstes Ausführungsbeispiel im Längsschnitt,
  • Fig. 2 einen Querschnitt des ersten Ausführungsbeispiels,
  • Fig. 3 ein zweites Ausführungsbeispiel im Längsschnitt,
  • Fig. 4 einen ersten Schnitt und
  • Fig. 5 einen zweiten Schnitt durch das zweite Ausführungsbeispiel.
The invention allows numerous embodiments. Two of these are shown schematically in the drawing using several figures and described below. It shows:
  • 1 shows a first embodiment in longitudinal section,
  • 2 shows a cross section of the first exemplary embodiment,
  • 3 shows a second embodiment in longitudinal section,
  • Fig. 4 shows a first section and
  • Fig. 5 shows a second section through the second embodiment.

Bei dem Einspritzventil nach Fig. 1 wird in einem becherförmigen Gehäuse 1 ein Magnetkern, bestehend aus einem oberen Kernteil 2 und einem unteren Kernteil 3 konzentrisch gehalten. Das obere Kernteil 2 ist in der Art eines Schalenkerns aus weichmagnetischem Material ausgeführt und wird oben durch einen Absatz 4 innerhalb des Gehäuses 1 zentriert. Während die untere Zentrierung des oberen Kernteils 2 sowie des unteren Kernteils 3 durch mehrere am Umfang des Gehäuses 1 verteilte Sicken 5 erfolgt.1, a magnetic core consisting of an upper core part 2 and a lower core part 3 is held concentrically in a cup-shaped housing 1. The upper core part 2 is designed in the manner of a shell core made of soft magnetic material and is centered at the top by a shoulder 4 within the housing 1. While the lower centering of the upper core part 2 and the lower core part 3 is carried out by a plurality of beads 5 distributed around the circumference of the housing 1.

Sowohl das Gehäuse 1 als auch das obere Kernteil weisen einen flanschartigen Rand auf. Bei der Herstellung des Einspritzventils werden zunächst alle Innenteile in das Ventil eingelegt und danach die flanschartigen Ränder des oberen Kernteils 2 und des Gehäuses durch Umbördelung des Deckels 11 festgelegt und damit das Einspritzventil verschlossen.Both the housing 1 and the upper core part have a flange-like edge. In the manufacture of the injection valve, all of the inner parts are first inserted into the valve and then the flange-like edges of the upper core part 2 and the housing are fixed by flanging the cover 11 and thus the injection valve is closed.

Innerhalb des oberen Kernteils ist auf einem vorzugsweise aus Kunststoff gefertigten Spulenträger 6 die Magnetspule 7 angeordnet. Die elektrischen Anschlüsse 8 der Magnetspule werden in einer rohrförmigen Fortsetzung 9 des Spulenträgers 6 nach außen geführt, wobei eine Ringdichtung 10 zwischen dem Deckel 11 des Einspritzventils und dem oberen Kernteil 2 vorgesehen ist. In eine zylindrische Bohrung des unteren Kernteils 3 ist eine Führungsbuchse 12 aus nichtmagnetisierbarem Material für den Anker 13 eingefügt. Der Anker 13 besteht aus einem im wesentlichen zylindrischen Teil 14, welches am Umfang verteilte Abflachungen 15 aufweist, damit Kraftstoff am Anker vorbeiströmen kann, wie später noch im einzelnen beschrieben wird. Die nicht abgeflachten Teile 16 der Umfangsfläche dienen als Gleitflächen des Ankers. Am unteren Ende des Ankers befindet sich das bewegliche Ventilteil 17, welches kegelförmig ausgebildet ist. Der kegelförmige Teil des beweglichen Ventilteils wirkt zusammen mit dem Ventilsitz 18, welches wie die Führungshülse 12 konzentrisch in das untere Kernteil 3 eingelegt ist.The magnetic coil 7 is arranged on the coil carrier 6, preferably made of plastic, within the upper core part. The electrical connections 8 of the magnetic coil are guided to the outside in a tubular continuation 9 of the coil carrier 6, an annular seal 10 being provided between the cover 11 of the injection valve and the upper core part 2. A guide bushing 12 made of non-magnetizable material for the armature 13 is inserted into a cylindrical bore of the lower core part 3. The armature 13 consists of a substantially cylindrical part 14, which ver on the circumference has divided flats 15 so that fuel can flow past the anchor, as will be described in detail later. The non-flattened parts 16 of the peripheral surface serve as sliding surfaces of the armature. At the lower end of the armature is the movable valve part 17, which is conical. The conical part of the movable valve part acts together with the valve seat 18 which, like the guide sleeve 12, is inserted concentrically into the lower core part 3.

Fließt kein Strom durch die Magnetspule 7, so wird der Anker 13 von einer Druckfeder 19 gegen den Ventilsitz 18 gepreßt. Die Druckfeder 19 stützt sich auf einem in eine zentrische Bohrung 20 des oberen Kernteils 2 eingepreßten Lagerteil 21 ab.If no current flows through the magnet coil 7, the armature 13 is pressed against the valve seat 18 by a compression spring 19. The compression spring 19 is supported on a bearing part 21 which is pressed into a central bore 20 of the upper core part 2.

Der Deckel 11 ist im mittleren Teil als Gehäuse für eine weitere Druckfeder 22 ausgebildet, welche Teil eines Druckreglers ist, der im weiteren aus einer Membran 23 und zwei Scheiben 24, 25 besteht, welche zusammen mit einer Hülse 26 ein Ventil bilden.The lid 11 is formed in the middle part as a housing for a further compression spring 22, which is part of a pressure regulator, which further consists of a membrane 23 and two disks 24, 25, which together with a sleeve 26 form a valve.

Der bei 27 zugeführte Kraftstoff gelangt zunächst in den äußeren Raum 28 des Einspritzventils. Von dort strömt er durch die Drallkanäle 29 in den inneren Raum des unteren Kernteils 3. Bei geschlossenem Ventil wird hierdurch - im Gegensatz zu den bekannten Einspritzventilen mit Dralleinrichtungen - bereits ein Drall erzeugt. Der Kraftstoff wird bei weiterhin geschlossenem Ventil am Anker vorbei durch Bohrungen 30, 31 im inneren Teil 32 des oberen Kernteils 2 hindurchgeleitet und gelangt durch den Zwischenraum 37 zwischen dem Spulenträger 6 und dem inneren Kernteil 32 und durch eine Drosselstelle 33 zur Bohrung 34, welche den Rücklauf des Kraftstoffs bildet.The fuel supplied at 27 initially reaches the outer space 28 of the injection valve. From there it flows through the swirl channels 29 into the inner space of the lower core part 3. When the valve is closed, a swirl is already generated in this way, in contrast to the known injection valves with swirl devices. With the valve still closed, the fuel is guided past the armature through bores 30, 31 in the inner part 32 of the upper core part 2 and passes through the intermediate space 37 between the coil carrier 6 and the inner core part 32 and through a throttle point 33 to the bore 34, which forms the return of the fuel.

Da sich bei dem geringen Systemdruck derartiger Kraftstoff-Einspritzsysteme im Kraftstoff Dampfblasen bilden können, ist der Absatz 4 des oberen Kernteils schräg ausgebildet. Die Dampfblasen wandern dann, ohne in die anderen Hohlräume des Einspritzventils zu gelangen, über den Kanal 36 zum Druckregler und werden von dort dem Kraftstoffrücklauf zugeleitet.Since vapor bubbles can form in the fuel at the low system pressure of such fuel injection systems, paragraph 4 of the upper core part is formed obliquely. The vapor bubbles then migrate via the channel 36 to the pressure regulator without getting into the other cavities of the injection valve and are fed from there to the fuel return.

Wird der Magnetspule 7 Strom zugeführt, so bewegt sich der Anker 13 unter Wirkung der magnetischen Kraftlinien nach oben. Damit er nicht am inneren Teil 32 des oberen Kernteils 2 nach dem Wiederabschalten des Stroms klebenbleibt, ist ein Ring 37 aus nichtmagnetischem Material vorgesehen. Ist der Anker 13 an dem dadurch gebildeten Anschlag angelangt, so wird der Kraftstoffrückfluß durch die Bohrungen 30 und 31 unterbrochen.If the magnetic coil 7 is supplied with current, the armature 13 moves upwards under the action of the magnetic lines of force. A ring 37 made of non-magnetic material is provided so that it does not stick to the inner part 32 of the upper core part 2 after the current has been switched off again. When the armature 13 has reached the stop formed thereby, the fuel return flow through the bores 30 and 31 is interrupted.

Da jedoch bereits zu Beginn der Ankerbewegung das Ventil geöffnet wird, findet ein ununterbrochener Kraftstoffzufluß durch die Drallkanäle 29 statt. Der in dem Innenraum des unteren Kernteils 3 befindliche Drall wird sowohl während der Schließ- als auch während der Öffnungsphase des Ventils ununterbrochen aufrechterhalten. Beim Öffnen des Ventils wird also sofort der Drall des Kraftstoffs wirksam, was zu einer besseren Zerstäubung und dadurch unter anderem zu einer geringeren Abgasemission der Brennkraftmaschine führt.However, since the valve is opened at the beginning of the armature movement, there is an uninterrupted flow of fuel through the swirl channels 29. The swirl located in the interior of the lower core part 3 is continuously maintained both during the closing and during the opening phase of the valve. When the valve is opened, the swirl of the fuel is immediately effective, which leads to better atomization and thus, among other things, to lower exhaust gas emissions from the internal combustion engine.

Fig. 2 zeigt einen Querschnitt durch das Einspritzventil nach Fig. 1 in der in Fig. 1 mit AB bezeichneten Ebene. Innerhalb des Gehäuses 1 ist das untere Kernteil 3 erkennbar mit vier Drallkanälen, welche tangential in den inneren Hohlraum des unteren Kernteils einmünden.FIG. 2 shows a cross section through the injection valve according to FIG. 1 in the plane labeled AB in FIG. 1. Inside the housing 1, the lower core part 3 can be seen with four swirl channels which open tangentially into the inner cavity of the lower core part.

Anstelle des Verschließens des Rücklaufs beim Öffnen des Ventils kann die Fläche der Drosselstelle 33 auch derart auf die Fläche der Abspritzstelle abgestimmt sein, daß sich ein zum Abspritzen optimaler Druck an der Abspritzstelle ergibt. Ein derartiges Ventil ist in Fig. 3 dargestellt, welches außerdem zum Unterschied zum Einspritzventil nach Fig. 1 einen Flachanker aufweist.Instead of closing the return line when the valve is opened, the area of the throttle point 33 can also be matched to the area of the spraying point in such a way that there is an optimal pressure at the spraying point for spraying. Such a valve is shown in FIG. 3, which also has a flat armature in contrast to the injection valve according to FIG. 1.

Der Deckel 11, der Druckregler 22, 23, 24, 25, 26, der Spulenträger 6 und die Magnetspule 7 sowie deren Teile 8, 9, 10 zur Stromführung sind entsprechend dem Einspritzventil nach Fig. 1 aufgebaut und brauchen deshalb nicht noch einmal erläutert- zu werden. Das Gehäuse des Einspritzventils nach Fig. 3 ist ebenfalls becherförmig aufgebaut und weist in der Grundplatte eine konzentrische Öffnung 41 auf. Im unteren Teil der Gehäusewandung befinden sich Sicken 42 zur Zentrierung der im folgenden beschriebenen Teile.The cover 11, the pressure regulator 22, 23, 24, 25, 26, the coil support 6 and the magnet coil 7 and their parts 8, 9, 10 for current supply are constructed in accordance with the injection valve according to FIG. 1 and therefore do not need to be explained again. to become. 3 is also cup-shaped and has a concentric opening 41 in the base plate. In the lower part of the housing wall there are beads 42 for centering the parts described below.

Der Magnetkern 43 ist aus weichmagnetischem Material in Form eines Schalenkerns ausgebildet und weist in seinem oberen Teil einen Absatz 44 zur Zentrierung auf. Der untere Teil wird durch die Sicken 42 zentriert. In eine umlaufende Ausnehmung 45 des Magnetkerns 43 ist ein nichtmagnetisierbares Kreisringelement 46 eingefügt, welches in axialer Richtung über den Magnetkern 43 hinausragt, damit der Anker 47 nicht am Magnetkern 43 "klebt". Der Anker ist in der in Fig. 3 gezeigten Form geprägt und weist eine Vielzahl von Bohrungen auf, um den Durchtritt des Kraftstoffs zu erleichtern.The magnetic core 43 is made of soft magnetic material in the form of a shell core and has a shoulder 44 in its upper part for centering. The lower part is centered by the beads 42. In a circumferential recess 45 of the magnetic core 43, a non-magnetizable circular ring element 46 is inserted, which in the axial direction extends beyond the magnetic core 43 so that the armature 47 does not "stick" to the magnetic core 43. The anchor is stamped in the form shown in FIG. 3 and has a multiplicity of bores in order to facilitate the passage of the fuel.

Das Kugelsegment-förmige bewegliche Ventilteil 48 ist konzentrisch mit dem Anker 47 formschlüssig verbunden. Es weist eine Bohrung 49 auf, in welche eine Druckfeder 50 eingreift. Auf der dem beweglichen Ventilteil abgewandte Seite ist die Druckfeder in einem Teil 52 gelagert, welches in eine Bohrung 51 des inneren Kernteils eingepreßt ist. Die Feder 50 drückt das bewegliche Ventilteil 48 gegen ein Sitzelement 53, welches zur Verringerung der Abnutzung aus hartem Material hergestellt ist.The spherical segment-shaped movable valve part 48 is connected to the armature 47 in a form-fitting manner. It has a bore 49 in which a compression spring 50 engages. On the side facing away from the movable valve part, the compression spring is mounted in a part 52 which is pressed into a bore 51 of the inner core part. The spring 50 presses the movable valve member 48 against a seat member 53 which is made of hard material to reduce wear.

Eine zur Zentrierung des beweglichen Ventilteils 48 dienende Membran 54 ist an ihrem äußeren Rand zwischen einem Abstandsring 55 und einem scheibenförmigen Element 56 eingespannt. Sowohl die Membran 54, als auch der Abstandsring 55 und das Element 56 werden durch die Sicken 42 beim Zusammenbau des Einspritzventils zentriert.A membrane 54 used to center the movable valve part 48 is clamped on its outer edge between a spacer ring 55 and a disk-shaped element 56. Both the membrane 54, as well as the spacer ring 55 and the element 56 are centered by the beads 42 during the assembly of the injection valve.

Das scheibenförmige Element 56 dient zur Trennung des äußeren Hohlraums 57 vom inneren Hohlraum 58 des Ventils. Drallnuten 59 verbinden beide Hohlräume miteinander.The disc-shaped element 56 serves to separate the outer cavity 57 from the inner cavity 58 of the valve. Swirl grooves 59 connect the two cavities to one another.

Der vom Zulauf 60 durch den äußeren Hohlraum 57 geführte Kraftstoff gelangt durch die Drallnuten 49 und erzeugt um das bewegliche Ventilteil 48 herum einen Drall. Kraftstoff fließt dann im inneren Hohlraum 58 um die Magnetspule herum durch die Drosselstelle 61 und die Bohrung 62 zum Rücklauf 63.The fuel led from the inlet 60 through the outer cavity 57 passes through the swirl grooves 49 and generates a swirl around the movable valve part 48. Fuel then flows in the internal cavity 58 around the solenoid through the throttle place 61 and the bore 62 to the return 63.

Durch Zuführung elektrischen Stroms zur Magnetspule 7 wird der Anker 47 entgegen der Spannung der Druckfeder 50 in Richtung auf den Magnetkern 43 bewegt. Damit wird die Ausspritzöffnung freigegeben. Der sich im Drall befindliche Kraftstoff wird sofort zu Beginn des Einspritzvorgangs aus dem Drall heraus entsprechend fein zerstäubt.By supplying electric current to the solenoid 7, the armature 47 is moved in the direction of the magnetic core 43 against the tension of the compression spring 50. This opens the ejection opening. The fuel in the swirl is atomized out of the swirl immediately at the beginning of the injection process.

Fig. 4 zeigt einen Querschnitt in der in Fig. 3 mit AB gezeichneten Ebene. Im scheibenförmigen Element 56 sind vier Drallnuten 49 angeordnet. Das Gehäuse 40 ist mit Zentriersicken 42 versehen. Der in Fig. 5 dargestellte Schnitt in der Ebene CD (Fig. 3) zeigt einen Teil des Gehäuses 40 und die Membran 54.FIG. 4 shows a cross section in the plane drawn with AB in FIG. 3. Four swirl grooves 49 are arranged in the disc-shaped element 56. The housing 40 is provided with centering beads 42. The section in the plane CD shown in FIG. 5 (FIG. 3) shows a part of the housing 40 and the membrane 54.

Claims (9)

1. Einspritzventil insbesondere für Kraftstoff-Einspritzanlagen von Brennkraftmaschinen, mit einer Magnetwicklung, einem Magnetkern, einem Anker, welcher mit einem beweglichen Ventilteil verbunden ist, das mit einem Ventilsitz zusammenwirkt, und mit innerhalb des Einspritzventils angeordneten Mitteln zur Erzeugung eines Dralls beim einzuspritzenden Kraftstoff, dadurch gekennzeichnet, daß der Innenraum des Ventils Teil eines Kraftstoff-Kreislaufs ist und daß die Mittel (29, 59) zur Erzeugung des Dralls derart angeordnet sind, daß sie im Kraftstoff-Kreislauf liegen und auch bei geschlossenem Einspritzventil von Kraftstoff durchströmt werden.1.Injection valve, in particular for fuel injection systems of internal combustion engines, with a magnetic winding, a magnetic core, an armature which is connected to a movable valve part which interacts with a valve seat, and with means arranged within the injection valve for generating a swirl in the fuel to be injected, characterized in that the interior of the valve is part of a fuel circuit and that the means (29, 59) for generating the swirl are arranged in such a way that they lie in the fuel circuit and fuel flows through them even when the injection valve is closed. 2. Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel (29, 59) zur Erzeugung des Dralls von Kanälen (29, 59) gebildet werden, welche mit tangentialer Komponente eine den Raum um das bewegliche Ventilteil und die Kraftstoffzuführung trennende Zwischenwand (3, 56) durchdringen.2. Injector according to claim 1, characterized in that the means (29, 59) for generating the swirl of channels (29, 59) are formed, which with a tangential component, the space around the movable valve part and the fuel supply penetrate the separating partition (3, 56). 3. Einspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß der Magnetkern (2, 3; 43) und gegebenenfalls andere gleichachsig angeordnete ringförmige Teile (46, 54, 55, 56) den Innenraum des Ventils in einen äußeren Hohlraum (25; 57), in welchen der Kraftstoff zuführbar ist, und einen inneren Hohlraum (37, 58) teilen und daß dem inneren Hohlraum (37, 58) Kraftstoff für den Rücklauf entnehmbar ist.3. Injection valve according to claim 2, characterized in that the magnetic core (2, 3; 43) and optionally other coaxially arranged annular parts (46, 54, 55, 56) the interior of the valve into an outer cavity (25; 57), in which the fuel can be supplied and share an inner cavity (37, 58) and that the inner cavity (37, 58) fuel for the return can be removed. 4. Einspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß der Kraftstoff für den Rücklauf über eine Drosselstelle (33, 61) entnehmbar ist.4. Injection valve according to claim 3, characterized in that the fuel for the return via a throttle point (33, 61) can be removed. 5. Einspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß der äußere Hohlraum (25, 57) und der innere Hohlraum (37, 58) ferner durch einen Druckregler (22-26) verbunden sind.5. Injection valve according to claim 3, characterized in that the outer cavity (25, 57) and the inner cavity (37, 58) are further connected by a pressure regulator (22-26). 6. Einspritzventil nach Anspruch 3, gekennzeichnet durch eine Vorrichtung zur Unterbrechung des Kraftstoffrückflusses während der Öffnungsphase des Einspritzventils.6. Injection valve according to claim 3, characterized by a device for interrupting the fuel reflux during the opening phase of the injection valve. 7. Einspritzventil nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Anker als Flachanker (47) ausgebildet ist und daß das bewegliche Ventilteil (48) die Form eines Kugelabschnittes aufweist und mit dem Anker (47) formschlüssig verbunden ist.7. Injection valve according to one of the preceding claims, characterized in that the armature is designed as a flat armature (47) and that the movable valve part (48) has the shape of a spherical section and is positively connected to the armature (47). 8. Einspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Magnetkern aus zwei Teilen (2, 3) besteht, wobei das eine, die Magnetwicklung (7) umfassende Teil (2) nach Art eines Schalenkerns geformt ist und das andere, mit dem einen gleichachsige Teil (3) eine zylindrische Bohrung aufweist, welche einen im wesentlichen zylinderförmigen Anker (13) beweglich aufnimmt, daß der Anker (13) an dem von der Magnetspule (7) abgewandten Ende als bewegliches Ventilteil geformt ist, das mit einem Ventilsitz (18) zusammenwirkt, und daß die zylindrische Bohrung mit einer Buchse (12) aus nichtmagnetischem Material versehen ist.8. Injection valve according to one of claims 1 to 6, characterized in that the magnetic core consists of two parts (2, 3), wherein one, the magnetic winding (7) comprising part (2) is shaped in the manner of a shell core and the other , with which a coaxial part (3) has a cylindrical bore which receives a substantially cylindrical armature (13) so that the armature (13) is shaped as a movable valve part at the end facing away from the magnet coil (7) a valve seat (18) cooperates, and that the cylindrical bore is provided with a sleeve (12) made of non-magnetic material. 9. Einspritzventil nach Anspruch 8, dadurch gekennzeichnet, daß ein Mittelschenkel des als Schalenkern ausgebildeten Kernteils (2) eine konzentrische Bohrung (20) aufweist und an der Stirnfläche mit einem Ring (37) aus nichtmagnetischem Material versehen ist und daß der Ring (37) zusammen mit dem Anker (13) ein Ventil bildet, das den Kraftstoffrückfluß unterbricht, wenn das Einspritzventil geöffnet ist.9. Injection valve according to claim 8, characterized in that a central leg of the core part (2) formed as a shell core has a concentric bore (20) and is provided on the end face with a ring (37) made of non-magnetic material and that the ring (37) together with the armature (13) forms a valve which interrupts the fuel return flow when the injector is open.
EP86102633A 1985-05-07 1986-02-28 Injection valve Withdrawn EP0200865A1 (en)

Applications Claiming Priority (2)

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DE19853516337 DE3516337A1 (en) 1985-05-07 1985-05-07 INJECTION VALVE
DE3516337 1985-05-07

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003226A1 (en) * 1986-10-30 1988-05-05 Allied Corporation Injector with swirl chamber return
FR2616485A1 (en) * 1987-06-09 1988-12-16 Weber Srl ATOMIZATION AND FUEL DOSING VALVE FOR A FUEL INJECTION DEVICE OF AN INTERNAL COMBUSTION ENGINE
US4805837A (en) * 1986-10-30 1989-02-21 Allied Corporation Injector with swirl chamber return
EP0536774A1 (en) * 1991-10-11 1993-04-14 WEBER S.r.l. An electromagnetically actuated fuel atomising and metering valve of very small dimensions
WO1999023383A1 (en) * 1997-11-03 1999-05-14 Slowik Guenter Method and injection nozzle for injecting fuel into the combustion chamber of an internal combustion engine
WO2003027482A1 (en) * 2001-09-05 2003-04-03 Robert Bosch Gmbh Fuel injection valve
WO2009034338A3 (en) * 2007-09-14 2009-06-04 Scion Sprays Ltd Internal combustion engine with a fuel injection system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0634609Y2 (en) * 1988-09-14 1994-09-07 株式会社ユニシアジェックス Electromagnetic fuel injection valve for internal combustion engine
DE102012209229A1 (en) 2012-05-31 2013-12-05 Robert Bosch Gmbh fuel injector

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FR1535190A (en) * 1966-08-27 1968-08-02 Fuel injection installation for internal combustion combustion engines, and engines fitted with said installation
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DE3148978A1 (en) * 1981-12-10 1983-06-23 Aisan Industry Co., Ltd., Obu, Aichi Fuel feed device for internal combustion engines
DE3303507A1 (en) * 1982-02-18 1983-08-25 Aisan Kogyo K.K., Obu, Aichi ELECTROMAGNETIC FUEL INJECTOR

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Publication number Priority date Publication date Assignee Title
FR1408212A (en) * 1963-05-01 1965-08-13 Ass Eng Ltd Fuel injection valves
FR1535190A (en) * 1966-08-27 1968-08-02 Fuel injection installation for internal combustion combustion engines, and engines fitted with said installation
FR2241008A1 (en) * 1973-08-17 1975-03-14 Tech Haute Precision Electro-magnetic petrol injector with rapid action - has accurately controlled annular fuel passage
FR2267458A1 (en) * 1974-04-13 1975-11-07 Daimler Benz Ag
FR2417646A1 (en) * 1978-02-18 1979-09-14 Bosch Gmbh Robert ELECTRO-MAGNETIC FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES
US4292947A (en) * 1978-11-07 1981-10-06 Kabushiki Kaisha Toyota Chuo Kenkyusho Spill type swirl injector
DE3111938A1 (en) * 1981-03-26 1982-10-07 Robert Bosch Gmbh, 7000 Stuttgart ELECTROMAGNET
GB2107784A (en) * 1981-10-16 1983-05-05 Bosch Gmbh Robert Fuel injector installation in an air intake throttle body
DE3148978A1 (en) * 1981-12-10 1983-06-23 Aisan Industry Co., Ltd., Obu, Aichi Fuel feed device for internal combustion engines
DE3303507A1 (en) * 1982-02-18 1983-08-25 Aisan Kogyo K.K., Obu, Aichi ELECTROMAGNETIC FUEL INJECTOR

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003226A1 (en) * 1986-10-30 1988-05-05 Allied Corporation Injector with swirl chamber return
US4805837A (en) * 1986-10-30 1989-02-21 Allied Corporation Injector with swirl chamber return
FR2616485A1 (en) * 1987-06-09 1988-12-16 Weber Srl ATOMIZATION AND FUEL DOSING VALVE FOR A FUEL INJECTION DEVICE OF AN INTERNAL COMBUSTION ENGINE
EP0536774A1 (en) * 1991-10-11 1993-04-14 WEBER S.r.l. An electromagnetically actuated fuel atomising and metering valve of very small dimensions
US5263649A (en) * 1991-10-11 1993-11-23 Weber S.R.L. Electromagetically actuated fuel atomising and metering valve of very small dimensions
WO1999023383A1 (en) * 1997-11-03 1999-05-14 Slowik Guenter Method and injection nozzle for injecting fuel into the combustion chamber of an internal combustion engine
US6311900B1 (en) * 1997-11-03 2001-11-06 SLOWIK GüNTER Procedure and injection nozzle for injecting fuel, in particular into the combustion chamber of an internal combustion engine
WO2003027482A1 (en) * 2001-09-05 2003-04-03 Robert Bosch Gmbh Fuel injection valve
US7093779B2 (en) 2001-09-05 2006-08-22 Robert Bosch Gmbh Fuel injection valve
WO2009034338A3 (en) * 2007-09-14 2009-06-04 Scion Sprays Ltd Internal combustion engine with a fuel injection system
US8479708B2 (en) 2007-09-14 2013-07-09 Robert Bosch Gmbh Internal combustion engine with a fuel injection system

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DE3516337A1 (en) 1986-11-13

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