EP0294586B1 - Fuel injection nozzle for internal combustion engines - Google Patents

Fuel injection nozzle for internal combustion engines Download PDF

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Publication number
EP0294586B1
EP0294586B1 EP19880107193 EP88107193A EP0294586B1 EP 0294586 B1 EP0294586 B1 EP 0294586B1 EP 19880107193 EP19880107193 EP 19880107193 EP 88107193 A EP88107193 A EP 88107193A EP 0294586 B1 EP0294586 B1 EP 0294586B1
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EP
European Patent Office
Prior art keywords
contact
cap nut
injection nozzle
nozzle
insulating body
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 - Lifetime
Application number
EP19880107193
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German (de)
French (fr)
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EP0294586A3 (en
EP0294586A2 (en
Inventor
Bernhard. Dipl.-Ing. Kaczyinski
Alfred Dipl.-Ing. Schmidt
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0294586A3 publication Critical patent/EP0294586A3/en
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Publication of EP0294586B1 publication Critical patent/EP0294586B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • 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

Definitions

  • the invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim.
  • injection nozzles of this type DE-A1 35 02 098
  • the contact lug attached to the contact ring is directly connected by soldering to the wall section of the conductor element leading to the incandescent body which projects into the area of the wall opening of the union nut.
  • this version it is not easy to securely isolate the live parts in the wall opening of the union nut and to seal the wall opening watertight.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the current-carrying parts are perfectly insulated from the wall opening and this is sealed watertight, these means also facilitate contacting the current-carrying parts.
  • the assembly of the parts is facilitated if the insulating body inserted into the wall opening of the union nut is integrally formed on the ring sleeve carrying the contact ring via a web part.
  • the molded part forming the insulating body, the web part and the ring sleeve can be produced simply in a two-part tool if the molded part is designed in the initial state so that the web part has a right-angled deflection and the recess in the insulating body which serves to accommodate the contact element is parallel to the axis of the Ring cuff runs.
  • FIG. 1 shows the exemplary embodiment enlarged in longitudinal section
  • FIG. 2 shows the conductor element of the exemplary embodiment in longitudinal section
  • FIG. 3 shows a plan view of the conductor element according to FIG. 2
  • FIG. 4 shows a molded part used in the exemplary embodiment in the initial state
  • FIG. 5 shows a plan view of the molded part according to FIG. 4 .
  • the injection nozzle has a nozzle body 10, in which a valve seat is formed and a valve needle is slidably mounted.
  • the nozzle body 10 and an intermediate disk 12 which limits the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16 in which a closing spring which presses 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.
  • an annealing insert designated as a whole by reference number 24, bears.
  • the latter has a filament 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 do not wet the incandescent body 26, but do produce an injector effect, by means of 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 disk 46, a second insulating body 48 and a metallic retaining ring 50 are successively fastened to the flange 36 of the socket 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 55 of the contact disk 46 is drawn conically 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 by the Incandescent 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 (FIG. 2), the downstream edge section 69 of which is drawn in conically inwards in accordance with the design of the contact disk 46.
  • a sleeve 68 (FIG. 2)
  • the sleeve 68 extends in an annular gap 74 which is between a smaller diameter section of the nozzle body 10 and the wall a first bore section 76 of the union nut 14 is formed. 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 insulating coverings 84 (FIG. 1), which have been omitted in FIGS. 2 and 3 for the sake of simplicity.
  • 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, which extends over two 120 ° divisions and is recessed over the length of the third 120 ° divisions.
  • the contact tongues 72 correspond to three wall openings 92 of the union nut 14, in each of which a bush-like insulating body 98 with a contact member 100 stuck therein is pressed.
  • the contact ring 64 is molded into a ring sleeve 102 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66.
  • Connected to the contact ring 64 are three contact lugs 103 offset by 120 °, each of which extends through a recess 104 in a ring collar 105 of the ring sleeve 102 and presses in a contacting manner against the spherical end face of the associated contact member 100.
  • On the other face of the Contact members 100 resiliently rest the slightly bent outward end sections of the three contact tongues 72 with sufficient pressure.
  • the contact lugs 103 and contact tongues 72 can also be connected to the contact members 100 by soldering or welding.
  • the three insulating bodies 98 are each integrally formed on the ring sleeve 102 via a web part 106.
  • the molded part 108 which forms the insulating bodies 98, the web parts 106 and the annular sleeve 102 is designed in the initial state in such a way that the web parts 106 have a right-angled deflection 110 and the cutouts 112 in the insulating bodies 98 used to receive the contact members 100 parallel to the axis of the ring cuff 102.
  • the molded part 108 can be produced in a simple, two-part tool.
  • the contact members 100 which can also be designed as a ball, for example, and possibly also the contact ring 64, are advantageously molded or molded onto the molded part 108 when it is produced.
  • the insulating bodies 98 are bent back accordingly and then pressed together with the contact members 100 into the wall openings 96 of the union nut 14.
  • the insulators 98 are provided on the inward-facing sides with lugs 114, which keep the contact points of the contact tongues 72 with the contact members 100 away from the outer surface of the washer 12 and center these with sufficient accuracy before tightening the union nut 14.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse für Brennkraftmaschinen nach der Gattung des Hauptanspruchs. Bei bekannten Einspritzdüsen dieser Gattung (DE-A1 35 02 098) ist die am Kontaktring angebrachte Kontaktfahne mit dem in den Bereich des Wanddurchbruches der Überwurfmutter ragenden Wandabschnitt des zum Glühkörper führenden Leiterelementes durch Löten unmittelbar verbunden. Bei dieser Ausführung ist es nicht ganz einfach, die stromführenden Teile im Wanddurchbruch der Überwurfmutter sicher zu isolieren und den Wanddurchbruch wasserdicht zu verschließen.The invention relates to a fuel injector for internal combustion engines according to the preamble of the main claim. In known injection nozzles of this type (DE-A1 35 02 098), the contact lug attached to the contact ring is directly connected by soldering to the wall section of the conductor element leading to the incandescent body which projects into the area of the wall opening of the union nut. With this version it is not easy to securely isolate the live parts in the wall opening of the union nut and to seal the wall opening watertight.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß mit einfachen Mitteln die stromführenden Teile gegenüber dem Wanddurchbruch einwandfrei isoliert sind und dieser wasserdicht verschlossen ist, wobei diese Mittel auch die Kontaktierung der stromführenden Teile erleichtern.The arrangement according to the invention with the characterizing features of the main claim has the advantage that the current-carrying parts are perfectly insulated from the wall opening and this is sealed watertight, these means also facilitate contacting the current-carrying parts.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des Gegenstandes des Hauptanspruchs möglich.Advantageous further developments of the subject matter of the main claim are possible through the measures listed in the subclaims.

Der Zusammenbau der Teile wird erleichtert, wenn der in den Wanddurchbruch der Überwurfmutter eingesetzte Isolierkörper über einen Stegteil einstückig an die den Kontaktring tragende Ringmanschette angeformt ist.The assembly of the parts is facilitated if the insulating body inserted into the wall opening of the union nut is integrally formed on the ring sleeve carrying the contact ring via a web part.

Das den Isolierkörper, den Stegteil und die Ringmanschette bildende Formteil kann einfach in einem zweiteiligen Werkzeug hergestellt werden, wenn das Formteil im Ausgangszustand so gestaltet ist, daß der Stegteil eine rechtwinklige Umlenkung aufweist und die zur Aufnahme des Kontaktglieds dienende Aussparung im Isolierkörper parallel zur Achse der Ringmanschette verläuft.The molded part forming the insulating body, the web part and the ring sleeve can be produced simply in a two-part tool if the molded part is designed in the initial state so that the web part has a right-angled deflection and the recess in the insulating body which serves to accommodate the contact element is parallel to the axis of the Ring cuff runs.

Weitere vorteilhafte Ausgetaltungen der Anordnung nach dem Hauptanspruch sind in den Ansprüchen 4 bis 6 enthalten.Further advantageous embodiments of the arrangement according to the main claim are contained in claims 4 to 6.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 das Ausführungsbeispiel vergrößert im Längsschnitt, Figur 2 das Leiterelement des Ausführungsbeispiels im Längsschnitt, Figur 3 eine Draufsicht auf das Leiterelement nach Figur 2, Figur 4 ein beim Ausführungsbeispiel verwendetes Formteil im Ausgangszustand und Figur 5 eine Draufsicht auf das Formteil nach Figur 4.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows the exemplary embodiment enlarged in longitudinal section, FIG. 2 shows the conductor element of the exemplary embodiment in longitudinal section, FIG. 3 shows a plan view of the conductor element according to FIG. 2, FIG. 4 shows a molded part used in the exemplary embodiment in the initial state, and FIG. 5 shows a plan view of the molded part according to FIG. 4 .

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einspritzdüse hat einen Düsenkörper 10, in welchem 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 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 has a nozzle body 10, in which a valve seat is formed and a valve needle is slidably mounted. The nozzle body 10 and an intermediate disk 12 which limits the stroke of the valve needle are clamped by a union nut 14 to a nozzle holder 16 in which a closing spring which presses 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 a central component, the latter has a filament 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 do not wet the incandescent body 26, but do produce an injector effect, by means of 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 ein metallischer Haltering 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 55 der Kontaktscheibe 46 ist konisch 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 disk 46, a second insulating body 48 and a metallic retaining ring 50 are successively fastened to the flange 36 of the socket 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 55 of the contact disk 46 is drawn conically 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 by the Incandescent 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 einen Teil seiner Länge als Hülse 68 (Figur 2) ausgebildet, deren stromabliegender Randabschnitt 69 entsprechend der Ausbildung der Kontaktscheibe 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 Isolierbelägen 84 (Figur 1) versehen, die in den Figuren 2 und 3 der Einfachheit halber weggelassen sind.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 (FIG. 2), 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 between a smaller diameter section of the nozzle body 10 and the wall a first bore section 76 of the union nut 14 is formed. 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 insulating coverings 84 (FIG. 1), which have been omitted in FIGS. 2 and 3 for the sake of simplicity.

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 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, which extends over two 120 ° divisions and is recessed over the length of the third 120 ° divisions.

Die Kontaktzungen 72 korrespondieren mit drei Wanddurchbrüchen 92 der Überwurfmutter 14, in welchen je ein buchsenartiger Isolierkörper 98 mit einem darin festsitzenden Kontaktglied 100 eingepreßt ist. Der Kontaktring 64 ist in eine aus Isolierstoff bestehende Ringmanschette 102 eingeformt, die ihrerseits oberhalb des Einschraubgewindes 66 formschlüssig auf der Überwurfmutter 14 befestigt ist. Mit dem Kontaktring 64 sind drei um 120° versetzte Kontaktfahnen 103 verbunden, die je durch eine Aussparung 104 in einem Ringbund 105 der Ringmanschette 102 hindurchgreifen und kontaktgebend gegen die eine, ballig ausgeführte Stirnfläche des zugeordneten Kontaktglieds 100 drücken. An der anderen Stirnfläche der Kontaktglieder 100 liegen die leicht nach außen abgebogenen Endabschnitte der drei Kontaktzungen 72 mit ausreichendem Druck federnd an. Die Kontaktfahnen 103 und Kontaktzungen 72 können auch durch Löten bzw. Schweißen mit den Kontaktgliedern 100 verbunden sein.The contact tongues 72 correspond to three wall openings 92 of the union nut 14, in each of which a bush-like insulating body 98 with a contact member 100 stuck therein is pressed. The contact ring 64 is molded into a ring sleeve 102 made of insulating material, which in turn is positively fastened on the union nut 14 above the screw thread 66. Connected to the contact ring 64 are three contact lugs 103 offset by 120 °, each of which extends through a recess 104 in a ring collar 105 of the ring sleeve 102 and presses in a contacting manner against the spherical end face of the associated contact member 100. On the other face of the Contact members 100 resiliently rest the slightly bent outward end sections of the three contact tongues 72 with sufficient pressure. The contact lugs 103 and contact tongues 72 can also be connected to the contact members 100 by soldering or welding.

Die drei Isolierkörper 98 sind je über einen Stegteil 106 einstückig an die Ringmanschette 102 angeformt. Gemäß Figur 4 ist das die Isolierkörper 98, die Stegteile 106 und die Ringmanschette 102 bildende Formteil 108 im Ausgangszustand so gestaltet, daß die Stegteile 106 eine rechtwinklige Umlenkung 110 aufweisen und die zur Aufnahme der Kontaktglieder 100 dienenden Aussparungen 112 in den Isolierkörpern 98 parallel zur Achse der Ringmanschette 102 verlaufen. Dadurch kann das Formteil 108 in einem einfachen, zweiteiligen Werkzeug hergestellt werden. Die Kontaktglieder 100, die beispielsweise auch als Kugel ausgebildet sein können, und gegebenenfalls auch der Kontaktring 64, werden vorteilhaft bei Herstellung des Formteils 108 mit an dieses ein- bzw. angeformt.The three insulating bodies 98 are each integrally formed on the ring sleeve 102 via a web part 106. According to FIG. 4, the molded part 108 which forms the insulating bodies 98, the web parts 106 and the annular sleeve 102 is designed in the initial state in such a way that the web parts 106 have a right-angled deflection 110 and the cutouts 112 in the insulating bodies 98 used to receive the contact members 100 parallel to the axis of the ring cuff 102. As a result, the molded part 108 can be produced in a simple, two-part tool. The contact members 100, which can also be designed as a ball, for example, and possibly also the contact ring 64, are advantageously molded or molded onto the molded part 108 when it is produced.

Beim Aufschieben des Formteils 108 auf die Überwurfmutter 14 werden die Isolierkörper 98 entsprechend zurückgebogen und dann zusammen mit den Kontaktgliedern 100 in die Wanddurchbrüche 96 der Überwurfmutter 14 eingepreßt. Die Isolierkörper 98 sind auf den nach dem Einpressen nach innen gekehrten Seiten mit Ansätzen 114 versehen, welche die Kontaktstellen der Kontaktzungen 72 mit den Kontaktgliedern 100 entfernt von der Mantelfläche der Zwischenscheibe 12 halten und diese vor dem Festziehen der Überwurfmutter 14 mit ausreichender Genauigkeit zentrieren.When the molded part 108 is pushed onto the union nut 14, the insulating bodies 98 are bent back accordingly and then pressed together with the contact members 100 into the wall openings 96 of the union nut 14. The insulators 98 are provided on the inward-facing sides with lugs 114, which keep the contact points of the contact tongues 72 with the contact members 100 away from the outer surface of the washer 12 and center these with sufficient accuracy before tightening the union nut 14.

Claims (6)

  1. Fuel injection nozzle for internal combustion engines, having a nozzle body (10) clamped by a cap nut (14) to a nozzle holder (16), and a glow element (26), which is arranged downstream of the nozzle body and forms a passage for the spray jets (30) and is connected to an electrical conductor element (62), which is constructed at least over a portion of its length as a sleeve which extends in an insulated fashion in an annular gap between the nozzle body and cap nut and is provided with at least one wall section (72), which projects into the region of a wall opening (96) of the cap nut and is connected there in an electrically conductive fashion to a contact lug (103) of a contact ring (64), which is fastened to an annular sleeve (102) arranged on the outer circumference of the cap nut and consisting of insulating material, characterised in that inserted to fit in the wall opening (96) of the cap nut (14) is an insulating body (98) which grips a metallic contact element (100) which is contacted on the outside by the contact lug (103) provided on the contact ring (64), and on the inside by the section (72), projecting into the region of the wall opening (96), of the conductor element leading to the glow element (26).
  2. Injection nozzle according to Claim 1, characterised in that the insulating body (98) inserted into the wall opening (96) of the cap nut (14) is integrally formed in one piece via a web part (106) on the annular sleeve (102) carrying the contact ring (64).
  3. Injection nozzle according to Claim 2, characterised in that the moulded part (108, Figure 4) forming the insulating body (98), the web part (106) and the annular sleeve (102) is configured in the initial state such that the web part (106) has a right-angled deflection (110), and the recess (112) in the insulating body (98) serving to accommodate the contact element (100) extends parallel to the axis of the annular sleeve (102).
  4. Injection nozzle according to one of Claims 1 to 3, characterised in that the contact element (100) and the contact ring (64), if necessary, is formed as the insulating body (98) or the moulded part (108) is being produced.
  5. Injection nozzle according to one of the preceding claims, in which the wall opening or openings, serving the purpose of contacting, in the cap nut are arranged at the level of a distance piece, which is clamped between the nozzle body and nozzle holder and serves to limit the stroke of a needle valve guided in the nozzle body, characterised in that the insulating body or bodies (98) are provided on their side facing the nozzle axis with attachments (114) which project beyond the corresponding contact surface of the contact element (120), avoid contact between the wall section (72), bearing against the contact element (100), of the conductor element (62) and the distance piece (12), and preferably also serve to centre the same.
  6. Injection nozzle according to one of the preceding claims, characterised in that the contact lugs (103) provided on the contact ring (64) engage through edge recesses (104) of an annular flange (106) of the annular sleeve (102), which flange projects beyond the adjacent end face edge of the contact ring (64).
EP19880107193 1987-06-11 1988-05-05 Fuel injection nozzle for internal combustion engines Expired - Lifetime EP0294586B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3719458 1987-06-11
DE19873719458 DE3719458A1 (en) 1987-06-11 1987-06-11 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Publications (3)

Publication Number Publication Date
EP0294586A2 EP0294586A2 (en) 1988-12-14
EP0294586A3 EP0294586A3 (en) 1990-01-31
EP0294586B1 true EP0294586B1 (en) 1991-12-18

Family

ID=6329472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880107193 Expired - Lifetime EP0294586B1 (en) 1987-06-11 1988-05-05 Fuel injection nozzle for internal combustion engines

Country Status (3)

Country Link
EP (1) EP0294586B1 (en)
JP (1) JPS6419167A (en)
DE (2) DE3719458A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993390A (en) * 1988-05-27 1991-02-19 Mitsubishi Jidosha Kogyo Akbushiki Kaisha Injector positioning device
JPH0437980U (en) * 1990-07-25 1992-03-31
US5730109A (en) * 1995-11-02 1998-03-24 Tag Co., Ltd. Exhaust gas purification system in combustion engine
JP3033499B2 (en) * 1996-08-22 2000-04-17 三菱自動車工業株式会社 Cylinder head sealing device
DE19743103A1 (en) * 1997-09-30 1999-04-01 Bosch Gmbh Robert Heat protection sleeve
DE19838748B4 (en) * 1998-08-26 2008-06-19 Daimler Ag On the combustion chamber of an internal combustion engine injecting fuel injection nozzle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207147B (en) * 1962-12-22 1965-12-16 Beru Werk Ruprecht Gmbh Co A Starting aid for internal combustion engines
DE3502098A1 (en) * 1985-01-23 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES

Also Published As

Publication number Publication date
EP0294586A3 (en) 1990-01-31
JPS6419167A (en) 1989-01-23
DE3866956D1 (en) 1992-01-30
EP0294586A2 (en) 1988-12-14
DE3719458A1 (en) 1988-12-29

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