EP0188746B1 - Device for the injection of fuel into a combustion chamber of an internal combustion engine - Google Patents

Device for the injection of fuel into a combustion chamber of an internal combustion engine Download PDF

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Publication number
EP0188746B1
EP0188746B1 EP85115989A EP85115989A EP0188746B1 EP 0188746 B1 EP0188746 B1 EP 0188746B1 EP 85115989 A EP85115989 A EP 85115989A EP 85115989 A EP85115989 A EP 85115989A EP 0188746 B1 EP0188746 B1 EP 0188746B1
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EP
European Patent Office
Prior art keywords
contact
nozzle
ring
injection
check nut
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
EP85115989A
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German (de)
French (fr)
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EP0188746A3 (en
EP0188746A2 (en
Inventor
Bernhard Dipl.-Ing. Kaczynski
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0188746A2 publication Critical patent/EP0188746A2/en
Publication of EP0188746A3 publication Critical patent/EP0188746A3/en
Application granted granted Critical
Publication of EP0188746B1 publication Critical patent/EP0188746B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • 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
    • F02M53/06—Injectors with heating, cooling, or thermally-insulating means with fuel-heating means, e.g. for vaporising
    • 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

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • the contact element is designed as a soldering point on a nozzle holder or a union nut of the injection nozzle or as a bare wire end or as a cable lug of a cable tail and connected to a conductor leading to the incandescent body, which is pressure-tight passed through the union nut or through a flange part carrying the incandescent body and clamped between the injection nozzle and a shoulder of the machine housing and to which a connection end of the incandescent body is soldered directly or via a further contact element.
  • the arrangement of a soldering support has the disadvantage that when removing the injection nozzle for the purpose of replacing the nozzle body or adjusting the injection pressure must be soldered.
  • a cable tail on the injection nozzle or a flange part carrying the incandescent body complicates the assembly if it emerges from the side of the union nut or the flange part and has to be passed through a bore in the machine housing.
  • the contact element is attached to an end face of a support element in the immediate vicinity of a fuel connection piece.
  • the power supply to the glow plug must be routed through the entire injection nozzle.
  • the direct juxtaposition of fuel and heating current connection can complicate assembly.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that both a soldering point and a cable tail on the injection nozzle or on a flange part carrying the glow element is omitted and the external heating current supply by simple screwing, clamping or the like Contact ring trained contact element can be connected.
  • the contact ring is attached to the union nut upstream of a screw-in thread.
  • the contact ring is accessible from all sides even when the injector is installed, so that its entire contact surface can be used to make contact by using clamps or the like.
  • the mating contact element connected to the external heating current supply can be a contact pin, which is arranged radially to the injection nozzle in a bore in the machine housing and which presses resiliently or clamped against the contact ring.
  • the contact ring is expediently provided with a contact tab which projects into the area of a wall opening in the union nut and is connected there to a conductor element leading to the incandescent body.
  • FIG. 1 shows an enlarged partial longitudinal section through the injection nozzle of the first exemplary embodiment
  • FIG. 2 shows an enlarged partial longitudinal section through the second exemplary embodiment.
  • the injection nozzle according to FIG. 1 has a nozzle body 10, in which, as is known, a valve seat is formed and a valve needle is displaceably mounted.
  • the nozzle body 10 and an intermediate disk 12 limiting the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16, in which u. a. a closing spring pressing the valve needle against the valve seat is accommodated.
  • the nozzle body 10 is provided with a conical wall section 18 which merges into a flat end wall 20.
  • the union nut 14 is extended on the combustion chamber side beyond the nozzle body 10 and is provided downstream of its end wall 20 with an inner support shoulder 22, against which an annealing insert, designated as a whole by reference number 24, bears.
  • this has a glow body 26 designed as a wire coil, which forms a passage 28 for the spray jets 30.
  • the incandescent body 26 is dimensioned such that the spray jets 30 the incandescent body by 26 do not wet, but cause an injector effect, through which air is sucked out of the combustion chamber into the interior of the incandescent body 26 or into the edge zones of the spray jets passing through the incandescent body 26.
  • the incandescent body 26 is surrounded by a metallic bush 32, which is fitted into a bore 34 of the union nut 14 and is provided with a flange 36 which bears against the support shoulder 22.
  • the bushing 32 has a flanged collar 38 which is folded outwards and holds the bushing 32 in the bore 34 without play.
  • the bushing 32 has an inwardly directed annular collar 40, which is provided with bores 42 and holds the end of the incandescent body 26 centered on the combustion chamber.
  • a first insulating body 44, a contact washer 46, a second insulating body 48 and a metallic holding washer 50 are successively attached to the flange 36 of the bushing 32 by gluing or soldering, an auxiliary tool centering the parts mutually.
  • the contact disk 46 is provided with bores 52 and an inner flanged collar 54 which contacts the upstream end of the incandescent body 26 and holds it in a centered manner.
  • the outer ring edge portion 50 of the contact disk 46 is drawn conically (cone 55) upwards.
  • a heat protection ring 56 is clamped, the conically raised outer ring edge 58 of which rests on the conical wall section 18 of the nozzle body 10.
  • the spray jets 30 passing through the incandescent body 26 produce an injector effect, through which air is sucked in from the combustion chamber through the bores 42 into an annular space 60 surrounding the incandescent body 26 and from there into the peripheral zones of the spray jets, in cooperation with the heating the glow body 26 gives a good mixture preparation.
  • a conductor element designated as a whole by reference number 62, which connects the contact disk 46 to a contact ring 64, which is fastened on the union nut 14 above a screw thread 66.
  • the conductor element 62 is formed over part of its length as a sleeve 68, the downstream edge section 69 of which is drawn in conically inwards in accordance with the design of the contact disk 46.
  • the sleeve 68 extends in an annular gap 74 which is formed between a section of the nozzle body 10 which is smaller in diameter and the wall of a first bore section 76 of the union nut 14. At a clamping shoulder 78, this merges into a second bore section 80, which comprises a larger diameter section of the nozzle body 10 with an annular gap 82, in which the contact tongues 72 extend.
  • the sleeve 68 and the contact tongues 72 are provided on the inside and outside with an insulating coating 84.
  • a pressure ring 88 is arranged, via which the union nut 14 clamps the nozzle body 10 and the washer 12 against the nozzle holder 16.
  • the pressure ring 88 three recesses 90 are provided, which are offset by 120 ° to each other, through which the contact tongues 72 with their bent portions 92 pass in an isolated manner.
  • the contact tongues 72 are connected to a ring web 94, which also has an insulating coating, and which extends over two 120 ° divisions. B. is recessed over the length of the third 120 ° division.
  • One of the contact tongues 72 corresponds to a wall opening 96 of the union nut 14, into which the free end of the contact tongue 72, which is slightly bent outwards, projects.
  • the contact ring 64 is molded into a ring sleeve 98 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66.
  • a contact tab 99 is formed on the contact ring 64, which protrudes into the wall opening 96 of the union nut 14 and is soldered there to the one contact tongue 72 of the conductor element 62.
  • the contact ring 64 can also be provided with two or three contact tabs 99, which are connected to contact tongues 72 of the conductor element 62 in the region of further wall openings in the union nut 14.
  • the glow insert 24 When assembling the injection nozzle according to FIG. 1, the glow insert 24 is first prefabricated and connected to the conductor element 62 by soldering. Thereafter, the pressure ring 88 is inserted into the conductor element 62, temporarily widening the contact tongue ring until it bears against the bends 92. Subsequently, the glow insert 24 together with the conductor element 62 and the pressure ring 88 is inserted into the union nut 14, the flange collar 38 of the socket 32 is folded over and the contact tongue 72 is connected to the contact tab 99 of the contact ring 64. Through these operations, one connection end of the filament 26 is connected to the contact ring 64 and the other connection end of the filament 26 is contacted with ground.
  • the heat protection ring 56 is placed on the nozzle body 10 and then the union nut 14 'is put on the parts and screwed onto the nozzle holder 16. In this case, the heat protection ring 56 is clamped and the nozzle body 10 and the intermediate disk 12 are firmly connected to the nozzle holder 16 via the pressure ring 88.
  • the heat protection ring 56 seals the installation space of the incandescent body 26 against the annular gap 74, so that no additional sealing elements and measures have to be provided for this.
  • the conductor element 62 is an inherently rigid structure de that it can be handled well and integrated into the production process.
  • the annular web 94 gives the conductor element 62 a sufficiently high rigidity in the area of the contact tongues 72, without making the insertion of the pressure ring 88 noticeably more difficult.
  • the arrangement of the pressure ring 88 eliminates cutouts in the ring shoulder 78 for the passage of the contact tongues 72, which would require increased production costs.
  • the conductor element 62 can be connected to the glow insert 24 before it is installed in the union nut 14 and the forces exerted by the tensioned heat protection ring 56 on the glow insert 24 are received in a dimensionally stable manner by the support shoulder 22 of the union nut 14.
  • a contact pin 120 is provided, which is seated in a clamping nut 122, which is screwed into a threaded bore arranged radially to the receiving bore for the injection nozzle in the cylinder head 124 of the machine.
  • the contact pin 120 has an annular collar 126 which bears against an annular shoulder 130 of the clamping nut 122 with the interposition of an insulating disk 128.
  • an insulating bush 132 bears against the collar 126, against which a threaded piece 134 screwed into the head of the clamping nut 122 presses.
  • the contact pin 120 is fixed in the clamping nut 122 in an insulated manner via the threaded piece 134, and the necessary contact pressure between the contact pin 120 and the contact ring 106 is generated by tightening the clamping nut 122.
  • the heating current supply can be fastened to the end section of the contact pin 120 which projects freely from the clamping nut 122 by means of known connecting elements.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Einrichtung nach der Gattung des Hauptanspruchs. Bei bekannten Einrichtungen dieser Gattung (DE-A1-33 07 109) ist das Kontaktelement als Lötstützpunkt an einem Düsenhalter bzw. einer Überwurfmutter der Einspritzdüse oder als blankes Drahtende bzw. als Kabelschuh eines Kabelschwanzes ausgebildet und mit einem zum Glühkörper führenden Leiter verbunden, der druckdicht durch die Überwurfmutter oder durch ein den Glühkörper tragendes, zwischen Einspritzdüse und einer Schulter des Maschinengehäuses eingespanntes Flanschteil hindurchgeführt und an das eine Anschlußende des Glühkörpers unmittelbar oder über ein weiteres Kontaktelement angelötet ist. Die Anordnung eines Lötstützpunktes hat den Nachteil, daß beim Ausbauen der Einspritzdüse zum Zwecke des Auswechselns des Düsenkörpers oder Nachstellens des Einspritzdruckes gelötet werden muß. Ein Kabelschwanz an der Einspritzdüse oder einen den Glühkörper tragenden Flanschteil erschwert die Montage, wenn er seitlich aus der Überwurfmutter bzw. dem Flanschteil heraustritt und durch eine Bohrung im Maschinengehäuse hindurchgeführt werden muß.The invention relates to a device according to the preamble of the main claim. In known devices of this type (DE-A1-33 07 109), the contact element is designed as a soldering point on a nozzle holder or a union nut of the injection nozzle or as a bare wire end or as a cable lug of a cable tail and connected to a conductor leading to the incandescent body, which is pressure-tight passed through the union nut or through a flange part carrying the incandescent body and clamped between the injection nozzle and a shoulder of the machine housing and to which a connection end of the incandescent body is soldered directly or via a further contact element. The arrangement of a soldering support has the disadvantage that when removing the injection nozzle for the purpose of replacing the nozzle body or adjusting the injection pressure must be soldered. A cable tail on the injection nozzle or a flange part carrying the incandescent body complicates the assembly if it emerges from the side of the union nut or the flange part and has to be passed through a bore in the machine housing.

Bei den Einspritzeinrichtungen nach der US-A-4 245 589 und der GB-A-2 131 539 ist das Kontaktelement an einer Stirnseite eines Tragelementes in unmittelbarer Nähe eines Kraftstoff-Anschlußstutzens befestigt. Dadurch muß die Stromzuführung zum Glühvorsatz durch die gesamte Einspritzdüse hindurchgeführt werden. Auch kann die unmittelbare Nebeneinanderanordnung von Kraftstoff- und Heizstromanschluß die Montage erschweren.In the case of the injection devices according to US-A-4 245 589 and GB-A-2 131 539, the contact element is attached to an end face of a support element in the immediate vicinity of a fuel connection piece. As a result, the power supply to the glow plug must be routed through the entire injection nozzle. The direct juxtaposition of fuel and heating current connection can complicate assembly.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß sowohl ein Lötstützpunkt als auch ein Kabelschwanz an der Einspritzdüse bzw. an einen den Glühkörper tragenden Flanschteil entfällt und die externe Heizstromzuführung durch einfaches Schrauben, Klemmen oder dgl. lösbar mit dem als Kontaktring ausgebildeten Kontaktelement verbunden werden kann.The arrangement according to the invention with the characterizing features of the main claim has the advantage that both a soldering point and a cable tail on the injection nozzle or on a flange part carrying the glow element is omitted and the external heating current supply by simple screwing, clamping or the like Contact ring trained contact element can be connected.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der im Hauptanspruch angegebenen Anordnung möglich.Advantageous developments of the arrangement specified in the main claim are possible through the measures listed in the subclaims.

Bei Einrichtungen, bei welchen der Glühkörper in die über das brennraumseitige Stirnende des Düsenkörpers verlängerte Überwurfmutter integriert ist, ergibt sich eine einfache und montagefreundlich Ausführung, wenn der Kontaktring auf dem den Düsenkörper radial umgreifenden Bereich der Überwurfmutter befestigt ist.In devices in which the incandescent body is integrated into the union nut extended over the end of the nozzle body on the combustion chamber side, a simple and easy-to-assemble design results if the contact ring is fastened on the region of the union nut which radially encompasses the nozzle body.

Besonders vorteilhaft ist es, wenn der Kontaktring stromauf eines Einschraubgewindes auf der Überwurfmutter befestigt ist. Bei dieser Anordnung ist der Kontaktring auch bei eingebauter Einspritzdüse von außen allseitig zugänglich, so daß seine gesamte Kontaktfläche durch Verwendung von Klemmschellen oder dgl. zur Kontaktgabe genutzt werden kann.It is particularly advantageous if the contact ring is attached to the union nut upstream of a screw-in thread. In this arrangement, the contact ring is accessible from all sides even when the injector is installed, so that its entire contact surface can be used to make contact by using clamps or the like.

Eine einfachere innere Verbindung zwischen dem Kontaktring und dem Glühkörper ergibt sich, wenn der Kontaktring zwischen dem Einschraubgewinde und dem brennraumseitigen Stirnende auf der Überwurfmutter befestigt ist. In diesem Fall kann das mit der externen Heizstromzuführung verbundene Gegenkontaktelement ein in einer Bohrung des Maschinengehäuses radial zur Einspritzdüse angeordneter Kontaktstift sein, der federnd oder festgespannt gegen den Kontaktring drückt.A simpler internal connection between the contact ring and the incandescent body is obtained if the contact ring is fastened on the union nut between the screw-in thread and the end face on the combustion chamber side. In this case, the mating contact element connected to the external heating current supply can be a contact pin, which is arranged radially to the injection nozzle in a bore in the machine housing and which presses resiliently or clamped against the contact ring.

Der Kontaktring wird zweckmäßig mit einer Kontaktfahne versehen, die in den Bereich eines Wanddurchbruchs der Überwurfmutter hineinragt und dort mit einem zum Glühkörper führenden Leiterelement verbunden ist.The contact ring is expediently provided with a contact tab which projects into the area of a wall opening in the union nut and is connected there to a conductor element leading to the incandescent body.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur 1 zeigt einen vergrößerten Teil-Längsschnitt durch die Einspritzdüse des ersten Ausführungsbeispiels und in Figur 2 ist ein vergrößerter Teil-Längsschnitt durch das zweite Ausführungsbeispiel dargestellt.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows an enlarged partial longitudinal section through the injection nozzle of the first exemplary embodiment, and FIG. 2 shows an enlarged partial longitudinal section through the second exemplary embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Einspritzdüse nach Figur 1 hat einen Düsenkörper 10, in welchem wie bekannt ein Ventilsitz gebildet und eine Ventilnadel verschiebbar gelagert ist. Der Düsenkörper 10 und eine den Hub der Ventilnadel begrenzende Zwischenscheibe 12 sind durch eine Überwurfmutter 14 an einem Düsenhalter 16 festgespannt, in welchem u. a. eine die Ventilnadel gegen den Ventilsitz pressende Schließfeder untergebracht ist. Am brennraumseitigen Stirnende ist der Düsenkörper 10 mit einem konischen Wandabschnitt 18 versehen, welcher in eine ebene Stirnwand 20 übergeht.The injection nozzle according to FIG. 1 has a nozzle body 10, in which, as is known, a valve seat is formed and a valve needle is displaceably mounted. The nozzle body 10 and an intermediate disk 12 limiting the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16, in which u. a. a closing spring pressing the valve needle against the valve seat is accommodated. At the front end on the combustion chamber side, the nozzle body 10 is provided with a conical wall section 18 which merges into a flat end wall 20.

Die Überwurfmutter 14 ist brennraumseitig über den Düsenkörper 10 hinaus verlängert und stromab von dessen Stirnwand 20 mit einer inneren Stützschulter 22 versehen, an welcher ein als Ganzes mit der Bezugszahl 24 bezeichneter Glüheinsatz anliegt. Dieser hat als zentrales Bauelement einen als Drahtwendel ausgeführten Glühkörper 26, der einen Durchgang 28 für die Spritzstrahlen 30 bildet. Der Glühkörper 26 ist so bemessen, daß die Spritzstrahlen 30 den Glühkörper 26 nicht benetzen, jedoch eine Injektorwirkung hervorrufen, durch welche Luft aus dem Brennraum in das Innere des Glühkörpers 26 bzw. in die Randzonen der den Glühkörper 26 durchsetzenden Spritzstrahlen angesaugt wird.The union nut 14 is extended on the combustion chamber side beyond the nozzle body 10 and is provided downstream of its end wall 20 with an inner support shoulder 22, against which an annealing insert, designated as a whole by reference number 24, bears. As the central component, this has a glow body 26 designed as a wire coil, which forms a passage 28 for the spray jets 30. The incandescent body 26 is dimensioned such that the spray jets 30 the incandescent body by 26 do not wet, but cause an injector effect, through which air is sucked out of the combustion chamber into the interior of the incandescent body 26 or into the edge zones of the spray jets passing through the incandescent body 26.

Der Glühkörper 26 ist von einer metallischen Buchse 32 umgeben, die passend in eine Bohrung 34 der Überwurfmutter 14 eingesetzt und mit einem Flansch 36 versehen ist, welcher an der Stützschulter 22 anliegt. Am brennraumseitigen Stirnende hat die Buchse 32 einen nach außen umgelegten Bördelkragen 38, welcher die Buchse 32 spielfrei in der Bohrung 34 festhält. Am selben Stirnende hat die Buchse 32 einen nach innen gerichteten Ringbund 40, der mit Bohrungen 42 versehen ist und das brennraumseitige Ende des Glühkörpers 26 zentriert festhält.The incandescent body 26 is surrounded by a metallic bush 32, which is fitted into a bore 34 of the union nut 14 and is provided with a flange 36 which bears against the support shoulder 22. At the front end on the combustion chamber side, the bushing 32 has a flanged collar 38 which is folded outwards and holds the bushing 32 in the bore 34 without play. At the same end, the bushing 32 has an inwardly directed annular collar 40, which is provided with bores 42 and holds the end of the incandescent body 26 centered on the combustion chamber.

Auf den Flansch 36 der Buchse 32 sind aufeinanderfolgend ein erster Isolierkörper 44, eine Kontaktscheibe 46, ein zweiter Isolierkörper 48 und eine metallische Haltescheibe 50 durch Kleben bzw. Löten befestigt, wobei ein Hilfswerkzeug die Teile gegenseitig zentriert. Die Kontaktscheibe 46 ist mit Bohrungen 52 und einem inneren Bördelkragen 54 versehen, der das stromaufliegende Ende des Glühkörpers 26 kontaktiert und zentriert festhält. Der äußere Ringrandabschnitt 50 der Kontaktscheibe 46 ist konisch (Konus 55) nach oben gezogen. Zwischen Haltering 50 und der Stirnwand 20 des Düsenkörpers 10 ist ein Wärmeschutzring 56 eingespannt, dessen konisch hochgestellter äußerer Ringrand 58 am konischen Wandabschnitt 18 des Düsenkörpers 10 anliegt.A first insulating body 44, a contact washer 46, a second insulating body 48 and a metallic holding washer 50 are successively attached to the flange 36 of the bushing 32 by gluing or soldering, an auxiliary tool centering the parts mutually. The contact disk 46 is provided with bores 52 and an inner flanged collar 54 which contacts the upstream end of the incandescent body 26 and holds it in a centered manner. The outer ring edge portion 50 of the contact disk 46 is drawn conically (cone 55) upwards. Between the retaining ring 50 and the end wall 20 of the nozzle body 10, a heat protection ring 56 is clamped, the conically raised outer ring edge 58 of which rests on the conical wall section 18 of the nozzle body 10.

Die den Glühkörper 26 durchsetzenden Spritzstrahlen 30 rufen eine Injektorwirkung hervor, durch die Luft aus dem Brennraum durch die Bohrungen 42 in einen den Glühkörper 26 umgebenden Ringraum 60 und von dort in die Randzonen der Spritzstrahlen eingesaugt wird, wobei sich .im Zusammenwirken mit der Aufheizung durch den Glühkörper 26 eine gute Gemischaufbereitung ergibt.The spray jets 30 passing through the incandescent body 26 produce an injector effect, through which air is sucked in from the combustion chamber through the bores 42 into an annular space 60 surrounding the incandescent body 26 and from there into the peripheral zones of the spray jets, in cooperation with the heating the glow body 26 gives a good mixture preparation.

Zum Zuführen des Heizstromes ist ein als Ganzes mit der Bezugszahl 62 bezeichnetes Leiterelement vorgesehen, welches die Kontaktscheibe 46 mit einem Kontaktring 64 verbindet, der oberhalb eines Einschraubgewindes 66 auf der Überwurfmutter 14 befestigt ist. Das Leiterelement 62 ist über ein Teil seiner Länge als Hülse 68 ausgebildet, deren stromabliegender Randabschnitt 69 entsprechend der Ausbildung der Kontakscheibe 46 konisch nach innen eingezogen ist. An den stromaufliegenden Rand 70 der Hülse 68 sind drei um je 120° zueinander versetzte Kontaktzungen 72 angeformt. Die Hülse 68 erstreckt sich in einem Ringspalt 74, der zwischen einem im Durchmesser kleineren Abschnitt des Düsenkörpers 10 und der Wand eines ersten Bohrungsabschnittes 76 der Überwurfmutter 14 gebildet ist. Dieser geht an einer Spannschulter 78 in einen zweiten Bohrungsabschnitt 80 über, der einen im Durchmesser größeren Abschnitt des Düsenkörpers 10 mit einem Ringspalt 82 umfaßt, in welchem sich die Kontaktzungen 72 erstrecken. Die Hülse 68 und die Kontaktzungen 72 sind innen und außen mit einem Isolierbelag 84 versehen.To supply the heating current, a conductor element, designated as a whole by reference number 62, is provided, which connects the contact disk 46 to a contact ring 64, which is fastened on the union nut 14 above a screw thread 66. The conductor element 62 is formed over part of its length as a sleeve 68, the downstream edge section 69 of which is drawn in conically inwards in accordance with the design of the contact disk 46. On the upstream edge 70 of the sleeve 68, three contact tongues 72, each offset by 120 °, are formed. The sleeve 68 extends in an annular gap 74 which is formed between a section of the nozzle body 10 which is smaller in diameter and the wall of a first bore section 76 of the union nut 14. At a clamping shoulder 78, this merges into a second bore section 80, which comprises a larger diameter section of the nozzle body 10 with an annular gap 82, in which the contact tongues 72 extend. The sleeve 68 and the contact tongues 72 are provided on the inside and outside with an insulating coating 84.

Zwischen der Spannschulter 78 der Überwurfmutter 14 und einer Ringschulter 86 des Düsenkörpers 10 ist ein Druckring 88 angeordnet, über welchen die Überwurfmutter 14 den Düsenkörper 10 und die Zwischenscheibe 12 gegen den Düsenhalter 16 spannt. Im Druckring 88 sind drei um 120° zueinander versetzte Aussparungen 90 vorgesehen, durch welche die Kontaktzungen 72 mit ihren Abkröpfungen 92 isoliert hindurchtreten. Oberhalb der Abkröpfungen 92 sind die Kontaktzungen 72 mit einem ebenfalls einen Isolierbelag tragenden Ringsteg 94 verbunden, der sich über zwei 120°Teilungen erstreckt und z. B. über die Länge der dritten 120°-Teilung ausgespart ist.Between the clamping shoulder 78 of the union nut 14 and an annular shoulder 86 of the nozzle body 10, a pressure ring 88 is arranged, via which the union nut 14 clamps the nozzle body 10 and the washer 12 against the nozzle holder 16. In the pressure ring 88 three recesses 90 are provided, which are offset by 120 ° to each other, through which the contact tongues 72 with their bent portions 92 pass in an isolated manner. Above the bends 92, the contact tongues 72 are connected to a ring web 94, which also has an insulating coating, and which extends over two 120 ° divisions. B. is recessed over the length of the third 120 ° division.

Eine der Kontaktzungen 72 korrespondiert mit einem Wanddurchbruch 96 der Überwurfmutter 14, in welchen das leicht nach außen abgebogene freie Ende der Kontaktzunge 72 hineinragt. Der Kontaktring 64 ist in eine aus Isolierstoff bestehende Ringmanschette 98 eingeformt, die ihrerseits oberhalb des Einschraubgewindes 66 formschlüssig auf der Überwurfmutter 14 befestigt ist. Am Kontaktring 64 ist eine Kontaktlasche 99 angeformt, welche in den Wanddurchbruch 96 der Überwurfmutter 14 hineinragt und dort mit der einen Kontaktzunge 72 des Leiterelementes 62 verlötet ist. Der Kontaktring 64 kann auch mit zwei oder drei Kontaktlaschen 99 versehen sein, die im Bereich weiterer Wanddurchbrüche der Überwurfmutter 14 mit Kontaktzungen 72 des Leiterelementes 62 verbunden sind.One of the contact tongues 72 corresponds to a wall opening 96 of the union nut 14, into which the free end of the contact tongue 72, which is slightly bent outwards, projects. The contact ring 64 is molded into a ring sleeve 98 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66. A contact tab 99 is formed on the contact ring 64, which protrudes into the wall opening 96 of the union nut 14 and is soldered there to the one contact tongue 72 of the conductor element 62. The contact ring 64 can also be provided with two or three contact tabs 99, which are connected to contact tongues 72 of the conductor element 62 in the region of further wall openings in the union nut 14.

Beim Zusammenbau der Einspritzdüse nach Figur 1 wird zunächst der Glüheinsatz 24 vorgefertigt und mit dem Leiterelement 62 durch Löten verbunden. Danach wird der Druckring 88 unter vorübergehender Aufweitung des Kontaktzungenkranzes bis zur Anlage an die Abkröpfungen 92 in das Leiterelement 62 eingeschoben. Anschließend wird der Glüheinsatz 24 samt Leiterelement 62 und Druckring 88 in die Überwurfmutter 14 eingesetzt, der Bördelkragen 38 der Buchse 32 umgelegt und die Kontaktzunge 72 mit der Kontaktlasche 99 des Kontakrings 64 verbunden. Durch diese Arbeitsgänge wird das eine Anschlußende des Glühkörpers 26 mit dem Kontaktring 64 verbunden und das andere Anschlußende des Glühkörpers 26 mit Masse kontaktiert.When assembling the injection nozzle according to FIG. 1, the glow insert 24 is first prefabricated and connected to the conductor element 62 by soldering. Thereafter, the pressure ring 88 is inserted into the conductor element 62, temporarily widening the contact tongue ring until it bears against the bends 92. Subsequently, the glow insert 24 together with the conductor element 62 and the pressure ring 88 is inserted into the union nut 14, the flange collar 38 of the socket 32 is folded over and the contact tongue 72 is connected to the contact tab 99 of the contact ring 64. Through these operations, one connection end of the filament 26 is connected to the contact ring 64 and the other connection end of the filament 26 is contacted with ground.

Bei der Fertigmontage der Einspritzdüse werden der Düsenhalter 16, die Zwischenscheibe 12 und der Düsenkörper 10 in der beschriebenen Reihenfolge aufeinandergesetzt, der Wärmeschutzring 56 auf den Düsenkörper 10 aufgelegt und danach die Überwurfmutter 14' auf die Teile aufgestülpt und auf den Düsenhalter 16 aufgeschraubt. Dabei werden der Wärmeschutzring 56 verspannt und über den Druckring 88 der Düsenkörper 10 und die Zwischenscheibe 12 fest mit dem Düsenhalter 16 verbunden. Der Wärmeschutzring 56 dichtet den Einbauraum des Glühkörpers 26 gegen den Ringspalt 74 ab, so daß hierfür keine zusätzlichen Dichtelemente und - maßnahmen vorgesehen werden müssen.During the final assembly of the injection nozzle, the nozzle holder 16, the washer 12 and the nozzle body 10 are placed one on top of the other in the sequence described, the heat protection ring 56 is placed on the nozzle body 10 and then the union nut 14 'is put on the parts and screwed onto the nozzle holder 16. In this case, the heat protection ring 56 is clamped and the nozzle body 10 and the intermediate disk 12 are firmly connected to the nozzle holder 16 via the pressure ring 88. The heat protection ring 56 seals the installation space of the incandescent body 26 against the annular gap 74, so that no additional sealing elements and measures have to be provided for this.

Das Leiterelement 62 ist ein eigensteifes Gebilde, daß sich gut handhaben und in den Fertigungsablauf integrieren läßt. Der Ringsteg 94 verleiht dem Leiterelement 62 auch im Bereich der Kontaktzungen 72 eine genügend große Steifigkeit, ohne das Einsetzen des Druckringes 88 nennenswert zu erschweren. Durch die Anordnung des Druckringes 88 entfallen.Aussparungen in der Ringschulter 78 für den Durchgang der Kontaktzungen 72, die einen erhöhten Fertigungsaufwand bedingen würden. Das Leiterelement 62 kann mit dem Glüheinsatz 24 vor dessen Einbau in die Überwurfmutter 14 verbunden werden und die vom verspannten Wärmeschutzring 56 auf den Glüheinsatz 24 ausgeübten Kräfte werden von der Stützschulter 22 der Überwurfmutter 14 formstabil aufgenommen. Durch die Ausbildung des Kontaktelementes für den äußeren Anschlußleiter als Kontaktring 64 werden ein Kabelschwanz an der Einspritzdüse vermieden und eine große Kontaktfläche geschaffen, auf welcher ein als Klemmschelle oder dgl. ausgebildetes Gegenkontaktelement fest aufgespannt werden kann.The conductor element 62 is an inherently rigid structure de that it can be handled well and integrated into the production process. The annular web 94 gives the conductor element 62 a sufficiently high rigidity in the area of the contact tongues 72, without making the insertion of the pressure ring 88 noticeably more difficult. The arrangement of the pressure ring 88 eliminates cutouts in the ring shoulder 78 for the passage of the contact tongues 72, which would require increased production costs. The conductor element 62 can be connected to the glow insert 24 before it is installed in the union nut 14 and the forces exerted by the tensioned heat protection ring 56 on the glow insert 24 are received in a dimensionally stable manner by the support shoulder 22 of the union nut 14. By designing the contact element for the outer connecting conductor as a contact ring 64, a cable tail on the injection nozzle is avoided and a large contact surface is created on which a mating contact element designed as a clamp or the like can be firmly clamped.

Die Einspritzdüse nach Figur 2 hat eine den Düsenkörper 10 spannende Überwurfmutter 102, die stromab ihres Einschraubgewindes 104 einen aus zwei Hälften zusammengesetzen Kontaktring 106 trägt. Dieser ist in einen Isolierkörper 108 eingebettet, der in eine Ringnut am Umfang der Überwurfmutter 102 eingeformt ist. Jede Hälfte des Kontaktringes 106 ist mit einer axial gerichteten Kontaktfahne 110 versehen, die in den Bereich eines Wanddurchbruches 112 der Überwurfmutter 102 ragt und dort mit einem Ansatz 114 einer Kontaktscheibe 116 verbunden ist, die im übrigen wie die Kontaktscheibe 46 des ersten Ausführungsbeispieles ausgebildet und in einen in die Überwurfmutter 102 eingesetzten Glüheinsatz 24a integriert ist.The injection nozzle according to FIG. 2 has a union nut 102 which grips the nozzle body 10 and which, downstream of its screw-in thread 104, carries a contact ring 106 composed of two halves. This is embedded in an insulating body 108 which is formed in an annular groove on the circumference of the union nut 102. Each half of the contact ring 106 is provided with an axially directed contact lug 110, which projects into the area of a wall opening 112 of the union nut 102 and is connected there to an extension 114 of a contact disk 116, which, moreover, is formed like the contact disk 46 of the first exemplary embodiment and in an annealing insert 24a inserted into the union nut 102 is integrated.

Zum Verbinden einer externen Heizstromzuführung mit dem Kontaktring 106 ist ein Kontaktstift 120 vorgesehen, der in einer Spannmutter 122 sitzt, welche in eine radial zur Aufnahmebohrung für die Einspritzdüse angeordnete Gewindebohrung im Zylinderkopf 124 der Maschine eingeschraubt ist. Der Kontaktstift 120 hat einen Ringbund 126, der unter Zwischenlage einer Isolierscheibe 128 an einer Ringschulter 130 der Spannmutter 122 anliegt. Auf der anderen Seite liegt eine Isolierbuchse 132 am Ringbund 126 an, gegen die ein in den Kopf der Spannmutter 122 eingeschraubtes Gewindestück 134 drückt. Über das Gewindestück 134 wird der Kontaktstift 120 in der Spannmutter 122 isoliert festgelegt und durch Anziehen der Spannmutter 122 wird der nötige Kontaktdruck zwischen Kontaktstift 120 und Kontaktring 106 erzeugt. An den frei aus der Spannmutter 122 herausragenden Endabschnitt des Kontaktstiftes 120 kann die Heizstromzuführung mittels bekannter Anschlußglieder befestigt werden.To connect an external heating current supply to the contact ring 106, a contact pin 120 is provided, which is seated in a clamping nut 122, which is screwed into a threaded bore arranged radially to the receiving bore for the injection nozzle in the cylinder head 124 of the machine. The contact pin 120 has an annular collar 126 which bears against an annular shoulder 130 of the clamping nut 122 with the interposition of an insulating disk 128. On the other side, an insulating bush 132 bears against the collar 126, against which a threaded piece 134 screwed into the head of the clamping nut 122 presses. The contact pin 120 is fixed in the clamping nut 122 in an insulated manner via the threaded piece 134, and the necessary contact pressure between the contact pin 120 and the contact ring 106 is generated by tightening the clamping nut 122. The heating current supply can be fastened to the end section of the contact pin 120 which projects freely from the clamping nut 122 by means of known connecting elements.

Claims (4)

1. Device for the injection of fuel into a combustion chamber of an internal-combustion engine, having an injection nozzle which has a nozzle element (10) which is clamped to a nozzle holder (16) by a check nut (14, 102) and having a glow element (26) following the injection nozzle, which glow element has a passage (28) surrounded by heatable structures for the spray jets (30) and the one connection end of which is connected to a contact element (64) insulated to earth, which serves as connection for an external heating current supply, characterized in that the contact element is constructed as a contact ring (64, 106) fastened to the jacket circumference of the check nut (14, 102), preferably coaxially with the injection nozzle.
2. Device according to Claim 1, characterized in that the glow element (26) is integrated into the check nut (14, 102) which is prolonged beyond the combustion chamber side end face of the nozzle element (10) and the contact ring (64, 106) is fastened on the region of the check nut (14,102) which embraces the nozzle element (10) radially (Figure 2).
3. Device according to Claim 1, characterized in that the contact ring (64) is fastened on the check nut (14) upstream of an engagement screw-thread (66) (Figure 1).
4. Device according to one of the preceding claims, characterized in that the contact ring (64, 106) is provided with a contact lug (99,110) which projects into the region of a wall perforation (96, 112) of the check nut (14, 102) and is connected there to a conductor element (46, 116) which leads to the glow element (26).
EP85115989A 1985-01-23 1985-12-14 Device for the injection of fuel into a combustion chamber of an internal combustion engine Expired EP0188746B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502112 DE3502112A1 (en) 1985-01-23 1985-01-23 DEVICE FOR INJECTING FUEL INTO THE COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE
DE3502112 1985-01-23

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EP0188746A2 EP0188746A2 (en) 1986-07-30
EP0188746A3 EP0188746A3 (en) 1987-04-15
EP0188746B1 true EP0188746B1 (en) 1989-04-26

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EP85115989A Expired EP0188746B1 (en) 1985-01-23 1985-12-14 Device for the injection of fuel into a combustion chamber of an internal combustion engine

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EP (1) EP0188746B1 (en)
JP (1) JPS61169658A (en)
DE (2) DE3502112A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD228598A1 (en) * 1984-05-11 1985-10-16 Karl Marx Stadt Automobilbau GLUEHEN CURVE ASSEMBLY, PREFERABLY FOR PRE-CHAMBER INTERNAL COMBUSTION ENGINES
DE3502098A1 (en) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3502109A1 (en) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3615635A1 (en) * 1986-05-09 1987-11-12 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3615634A1 (en) * 1986-05-09 1987-11-12 Bosch Gmbh Robert DEVICE FOR INJECTING FUEL INTO THE COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE
DE3617354A1 (en) * 1986-05-23 1987-11-26 Bosch Gmbh Robert DEVICE FOR INJECTING FUEL INTO THE COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE
JP2801003B2 (en) * 1987-06-26 1998-09-21 株式会社日立製作所 Organic matter removal equipment
DE3731231A1 (en) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Device for the injection of fuel into the combustion chamber of an internal combustion engine

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3307109A1 (en) * 1982-08-14 1984-03-15 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR INJECTING FUEL INTO COMBUSTION ROOMS, IN PARTICULAR SELF-IGNITION COMBUSTION ENGINES

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Publication number Priority date Publication date Assignee Title
US4245589A (en) * 1978-07-18 1981-01-20 Ryan Joseph C Exothermic injector adapter
GB2131539B (en) * 1982-12-02 1986-04-16 Lucas Ind Plc Electric starting aids for internal combustion engines

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
DE3307109A1 (en) * 1982-08-14 1984-03-15 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR INJECTING FUEL INTO COMBUSTION ROOMS, IN PARTICULAR SELF-IGNITION COMBUSTION ENGINES

Also Published As

Publication number Publication date
JPS61169658A (en) 1986-07-31
EP0188746A3 (en) 1987-04-15
DE3569783D1 (en) 1989-06-01
DE3502112A1 (en) 1986-07-24
EP0188746A2 (en) 1986-07-30

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