EP0244619A1 - Apparatus for injecting fuel into the combustion chamber of an internal-combustion engine - Google Patents

Apparatus for injecting fuel into the combustion chamber of an internal-combustion engine Download PDF

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Publication number
EP0244619A1
EP0244619A1 EP87104392A EP87104392A EP0244619A1 EP 0244619 A1 EP0244619 A1 EP 0244619A1 EP 87104392 A EP87104392 A EP 87104392A EP 87104392 A EP87104392 A EP 87104392A EP 0244619 A1 EP0244619 A1 EP 0244619A1
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EP
European Patent Office
Prior art keywords
ring
contact
nozzle
ceramic body
collar
Prior art date
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Granted
Application number
EP87104392A
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German (de)
French (fr)
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EP0244619B1 (en
Inventor
Bernhard Dipl.-Ing. Kaczynski
Alfred Dr. Schmitt
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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 EP0244619A1 publication Critical patent/EP0244619A1/en
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Publication of EP0244619B1 publication Critical patent/EP0244619B1/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 device for injecting fuel according to the preamble of the main claim.
  • the two two-dimensional contact elements serving to contact the heating element are designed as ring-segment-shaped sheets, both of which are fastened to the ceramic body on the upper end face of the annular collar facing the nozzle body.
  • the spring ring clamped between the nozzle body and the ceramic body is supported on the ceramic body by an insulating disk covering both contact elements, and both contact elements are each electrically conductively connected to the power supply line or the nozzle body via a contact pin penetrating the insulating disk and the central bore of the spring ring.
  • This training is relatively sensitive to tolerances and also requires increased manufacturing and assembly costs.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage of a lower Emp sensitivity to tolerance deviations of the parts, because these are completely absorbed and compensated by the spring washer. It is also achieved that the contacting of the heating element can take place via sufficiently large contact surfaces which can be produced for production, as a result of which local overheating of current-carrying line elements can easily be avoided.
  • the contacting of the first contact element connected to the combustion chamber-side connection of the heating element, which is located on the lower ring side of the ring collar on the ceramic body, is facilitated if the line element, which connects the first contact element to the power supply line, has a metallic contact washer located under the ring collar of the ceramic body which has at least one contact tongue which laterally circumferentially surrounds the ring collar.
  • the assembly of the device is facilitated if the ceramic body, the contact ring washer and a ring-shaped insulating body arranged underneath, and optionally a pressure ring on the ceramic body, are inserted and fastened in a sleeve, and if the assembly thus formed as a whole is attached to the end face of the union nut on the combustion chamber side is attached.
  • the injection nozzle has a nozzle body 10 which is fastened to a nozzle holder (not shown) by a union nut 12.
  • a valve seat is formed in the nozzle body 10 and a valve needle is displaceably mounted, which is loaded in the opening direction by the fuel pressure and in the opposite direction by a closing spring.
  • the injection nozzle is inserted into a bore 14 of a machine housing 16, which merges at an annular shoulder 18 into a narrowed bore section 20 which leads into a combustion chamber.
  • the installation gap is sealed by a sealing ring 22 which bears against an annular shoulder 24 of the union nut 12 and is pressed by the latter against the annular shoulder 18 of the machine housing 16.
  • the nozzle body 10 is followed by an annealing insert, designated as a whole by the reference number 26, which is installed in an end collar 28 of the union nut 12, which begins at the annular shoulder 24 and projects into the narrowed bore section 20.
  • the glow insert 26 has as its central component a sleeve-shaped ceramic body 30, which forms a passage 32 for the spray jets 34 and is provided with an annular flange 36 at the top.
  • the ceramic body 30 serves as a support for a printed or otherwise, e.g. heating element 40 applied by vapor deposition, preferably subsequently provided with a glass coating, which in the exemplary embodiment consists of a plurality of annular heating conductor surfaces connected in parallel on the inner wall of ceramic body 30.
  • the heating element 40 can also be designed differently than shown to adapt to the respective application, e.g. as a helically rising heating conductor surface with the same or different surface width.
  • the heating element 40 has as the first connection a conductor track 42 attached to the outer jacket of the ceramic body 30, which is connected to a contact covering 44 covering the lower ring surface of the ring collar 36.
  • the other connection of the heating element 40 is designed as a conductor track 46 which extends on the inner wall of the ceramic body 30 and is connected to a contact covering 48 which covers the entire circumference of the ring collar 36.
  • Ceramic body 30 are also provided below the annular flange 36 a plurality of holes 50 through which the spray jets 34 suck air from the combustion chamber due to the injector effect.
  • the end collar 28 of the union nut 12 has an inwardly directed annular shoulder 52, on which a metallic mounting sleeve 54 is seated, which is connected to the union nut 12 via an annular weld seam 56.
  • the mounting sleeve 54 modeled on the inner contour of the ring collar 28 carries an electrically insulating ceramic ring 58, on the upper end face of which a metallic contact ring disk 60 is seated, on which the ceramic body 30 rests with its contact coating 44.
  • the contact ring disk 60 has a laterally projecting and upwardly angled contact tongue 62 which passes through a local recess 64 in the mounting sleeve 54 and is connected to a power supply line 66 which is insulated and passed through the injection nozzle.
  • a metallic pressure ring 68 on which the middle ring area of a spring ring 70 is supported, the inner ring edge of which resiliently presses against the flat end face of the nozzle body 10 and the outer ring edge of which rests on a conical wall surface of the nozzle body 10 centered.
  • the ceramic ring 58, the contact ring disk 60, the ceramic body 30 already provided with the heating element 40 and its connecting elements 42 to 48 are first and the pressure ring 68 inserted in the order described in the mounting sleeve 54 and then firmly connected to it, for example by a soldering process. Then this group of parts forms the glow insert 26, which is inserted as a whole into the union nut 12 from its upper end face, advanced to the annular shoulder 52 and then welded to the union nut 12.
  • the spring 70 and the nozzle body 10 can be inserted into the union nut 12 and clamped by this to the nozzle holder, as a result of which the spring ring 70 is braced in the desired manner and seals the annular gap between the nozzle body 10 and union nut 12 to the passage 32 and to the combustion chamber.

Abstract

1. Apparatus for injecting fuel into the combustion chamber of an internal-combustion engine, having an injection nozzle and a following flow element which has a sleeve-shaped ceramic element (30) which forms a passage (32) for the fuel spray jets (34) and supports an electric heater element (40), the two terminals (42, 46) of which are connected to laminar contact elements (44, 48) which are arranged fixed on a ring collar (36) of the ceramic element (30) and of which one is in contact with the nozzle element (10) of the injection nozzle and the other with an electric lead (66) insulated relative to the injection nozzle, and also having a spring ring (70) clamped between the nozzle element (10) and the ring collar (36) of the ceramic element (30) which seals the ring gap between these parts, characterized in that the first contact element (44) which is connected to one terminal (42) of the heater element (40) is arranged on the lower ring side of the ring collar (36) on the ceramic element (30) facing away from the nozzle element (10) and is connected to the electric lead (66) by a conductor element (60, 62) which bypasses insulated the second contact element (48) which is connected to the other terminal (46) of the heater element (40) and which is arranged in known manner on the upper end face of the ring collar (36) on the ceramic element (30) which faces the nozzle element (10) and is in contact with the nozzle element (10) via the spring ring (70).

Description

Stand der TechnikState of the art

Die Erfindung bezieht sich auf eine Einrichtung zum Einspritzen von Kraftstoff nach der Gattung des Hauptanspruchs. Bei einer bekannten Einrichtung dieser Gattung (DE-A1 33 07 666) sind die beiden zur Kontaktierung des Heizelementes dienenden flächenhaften Kontaktelemente als ringsegmentförmige Bleche ausgebildet, die beide auf der dem Düsenkörper zugekehrten oberen Stirnseite des Ringbundes am Keramikkörper befestigt sind. Der zwischen dem Düsenkörper und dem Keramikkörper eingespannte Federring ist über eine beide Kontaktelemente überdeckende Isolierscheibe am Keramikkörper abgestützt und beide Kontaktelemente sind je über einen die Isolierscheibe und die zentrale Bohrung des Federrings durchsetzenden Kontaktstift mit der Stromzuleitung bzw. dem Düsenkörper elektrisch leitend verbunden. Diese Ausbildung ist verhältnismäßig toleranzempfindlich und erfordert auch einen erhöhten Fertigungs- und Montageaufwand.The invention relates to a device for injecting fuel according to the preamble of the main claim. In a known device of this type (DE-A1 33 07 666), the two two-dimensional contact elements serving to contact the heating element are designed as ring-segment-shaped sheets, both of which are fastened to the ceramic body on the upper end face of the annular collar facing the nozzle body. The spring ring clamped between the nozzle body and the ceramic body is supported on the ceramic body by an insulating disk covering both contact elements, and both contact elements are each electrically conductively connected to the power supply line or the nozzle body via a contact pin penetrating the insulating disk and the central bore of the spring ring. This training is relatively sensitive to tolerances and also requires increased manufacturing and assembly costs.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil einer geringeren Empfindlichkeit gegen Toleranzabweichungen der Teile, weil diese vollständig durch den Federring aufgenommen und ausgeglichen werden. Ferner ist erreicht, daß die Kontaktierung des Heizelementes über ausreichend große, fertigungsgerecht herstellbare Kontaktflächen erfolgen kann, wodurch sich örtliche Uberhitzungen von stromführenden Leitungselementen leicht vermeiden lassen.The arrangement according to the invention with the characterizing features of the main claim has the advantage of a lower Emp sensitivity to tolerance deviations of the parts, because these are completely absorbed and compensated by the spring washer. It is also achieved that the contacting of the heating element can take place via sufficiently large contact surfaces which can be produced for production, as a result of which local overheating of current-carrying line elements can easily be avoided.

Durch die in den Unteransprüchen enthaltenen Maßnahmen sind vorteilhafte Weiterbildungen des Gegenstandes des Hauptanspruchs möglich.The measures contained in the subclaims allow advantageous developments of the subject matter of the main claim.

Die Kontaktierung des mit dem brennraumseitigen Anschluß des Heizelementes verbundenen ersten Kontaktelementes, das sich an der unteren Ringseite des Ringbundes am Keramikkörper befindet, wird erleichtert, wenn das Leitungselement, welches das erste Kontaktelement mit der Stromzuleitung verbindet, eine unter dem Ringbund des Keramikkörpers liegende metallische Kontaktringscheibe ist, die mindestens eine den Ringbund seitlich umgehende Kontaktzunge hat.The contacting of the first contact element connected to the combustion chamber-side connection of the heating element, which is located on the lower ring side of the ring collar on the ceramic body, is facilitated if the line element, which connects the first contact element to the power supply line, has a metallic contact washer located under the ring collar of the ceramic body which has at least one contact tongue which laterally circumferentially surrounds the ring collar.

Der Zusammenbau der Einrichtung wird erleichtert, wenn der Keramikkörper, die Kontaktringscheibe und ein darunter angeordneter ringförmiger Isolierkörper, sowie gegebenenfalls ein Druckring auf dem Keramikkörper in eine Hülse eingesetzt und darin befestigt sind, und wenn die so gebildete Baugruppe als Ganzes an dem brennraumseitigen Stirnende der Uberwurfmutter befestigt ist.The assembly of the device is facilitated if the ceramic body, the contact ring washer and a ring-shaped insulating body arranged underneath, and optionally a pressure ring on the ceramic body, are inserted and fastened in a sleeve, and if the assembly thus formed as a whole is attached to the end face of the union nut on the combustion chamber side is attached.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt in vergrößertem Maßstab einen Längsschnitt durch das brennraumseitige Ende einer Einspritzdüse mit integriertem Glüheinsatz.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The only figure shows, on an enlarged scale, a longitudinal section through the combustion chamber end of an injection nozzle with an integrated glow insert.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Einspritzdüse hat einen Düsenkörper 10, der durch eine Überwurfmutter 12 an einem nicht dargestellten Düsenhalter befestigt ist. Im Düsenkörper 10 ist ein Ventilsitz gebildet und eine Ventilnadel verschiebbar gelagert, die in Öffnungsrichtung vom Kraftstoffdruck und entgegengesetzt dazu von einer Schließfeder belastet ist. Die Einspritzdüse ist in eine Bohrung 14 eines Maschinengehäuses 16 eingesetzt, welche an einer Ringschulter 18 in einen verengten Bohrungsabschnitt 20 übergeht, der in einen Brennraum führt. Der Einbauspalt ist durch einen Dichtring 22 abgedichtet, der an einer Ringschulter 24 der Überwurfmutter 12 anliegt und von dieser gegen die Ringschulter 18 des Maschinengehäuses 16 gepreßt ist.The injection nozzle has a nozzle body 10 which is fastened to a nozzle holder (not shown) by a union nut 12. A valve seat is formed in the nozzle body 10 and a valve needle is displaceably mounted, which is loaded in the opening direction by the fuel pressure and in the opposite direction by a closing spring. The injection nozzle is inserted into a bore 14 of a machine housing 16, which merges at an annular shoulder 18 into a narrowed bore section 20 which leads into a combustion chamber. The installation gap is sealed by a sealing ring 22 which bears against an annular shoulder 24 of the union nut 12 and is pressed by the latter against the annular shoulder 18 of the machine housing 16.

Dem Düsenkörper 10 ist ein als Ganzes mit der Bezugszahl 26 bezeichneter Glüheinsatz nachgeschaltet, der in einen an der Ringschulter 24 beginnenden und in den verengten Bohrungsabschnitt 20 hineinragenden Stirnkragen 28 der Überwurfmutter 12 eingebaut ist. Der Glüheinsatz 26 hat als zentrales Bauelement einen hülsenförmigen Keramikkörper 30, der einen Durchgang 32 für die Spritzstrahlen 34 bildet und oben mit einem Ringflansch 36 versehen ist. Der Keramikkörper 30 dient als Träger für ein aufgedrucktes oder auf andere Weise, z.B. durch Aufdampfen aufgebrachtes, vorzugsweise nachträglich mit einem Glasüberzug versehenes Heizelement 40, welches beim Ausführungsbeispiel aus mehreren elektrisch parallelgeschalteten ringförmigen Heizleiterflächen an der Innenwand des Keramikkörpers 30 besteht. Das Heizelement 40 kann auch in Anpassung an den jeweiligen Anwendungsfall anders als dargestellt.ausgebildet sein, z.B. als eine wendelförmig ansteigende Heizleiterfläche mit gleicher oder unterschiedlicher Flächenbreite.The nozzle body 10 is followed by an annealing insert, designated as a whole by the reference number 26, which is installed in an end collar 28 of the union nut 12, which begins at the annular shoulder 24 and projects into the narrowed bore section 20. The glow insert 26 has as its central component a sleeve-shaped ceramic body 30, which forms a passage 32 for the spray jets 34 and is provided with an annular flange 36 at the top. The ceramic body 30 serves as a support for a printed or otherwise, e.g. heating element 40 applied by vapor deposition, preferably subsequently provided with a glass coating, which in the exemplary embodiment consists of a plurality of annular heating conductor surfaces connected in parallel on the inner wall of ceramic body 30. The heating element 40 can also be designed differently than shown to adapt to the respective application, e.g. as a helically rising heating conductor surface with the same or different surface width.

Das Heizelement 40 hat als ersten Anschluß eine am Außenmantel des Keramikkörpes 30 angebrachte Leiterbahn 42, die mit einem die untere Ringfläche des Ringbundes 36 bedeckenden Kontaktbelag 44 verbunden ist. Der andere Anschluß des Heizelementes 40 ist als eine sich an der Innenwand des Keramikkörpers 30 erstreckende Leiterbahn 46 ausgeführt, die mit einem die obere Ringfläche des Ringbundes 36 über den gesamten Umfang bedeckenden Kontaktbelag 48 verbunden ist. Im . Keramikkörper 30 sind ferner unterhalb des Ringflansches 36 mehrere Bohrungen 50 vorgesehen, durch welche die Spritzstrahlen 34 infolge Injektorwirkung Luft aus dem Brennraum ansaugen.The heating element 40 has as the first connection a conductor track 42 attached to the outer jacket of the ceramic body 30, which is connected to a contact covering 44 covering the lower ring surface of the ring collar 36. The other connection of the heating element 40 is designed as a conductor track 46 which extends on the inner wall of the ceramic body 30 and is connected to a contact covering 48 which covers the entire circumference of the ring collar 36. In the . Ceramic body 30 are also provided below the annular flange 36 a plurality of holes 50 through which the spray jets 34 suck air from the combustion chamber due to the injector effect.

Der Stirnkragen 28 der Überwurfmutter 12 hat eine nach innen gekehrte Ringschulter 52, auf der eine metallische Montagehülse 54 aufsitzt, die über eine ringförmige Schweißnaht 56 mit der Überwurfmutter 12 verbunden ist. Die der Innenkontur des Ringkragens 28 nachgebildete Montagehülse 54 trägt einen elektrisch isolierenden Keramikring 58, auf dessen oberer Stirnfläche eine metallische Kontaktringscheibe 60 sitzt, auf welcher der Keramikkörper 30 mit seinem Kontaktbelag 44 aufliegt. Die Kontaktringscheibe 60 hat eine seitlich abstehende und nach oben abgewinkelte Kontaktzunge 62, welche durch eine örtliche Aussparung 64 in der Montagehülse 54 hindurchtritt und mit einer isoliert durch die Einspritzdüse hindurchgeführten Stromzuleitung 66 verbunden ist. Auf dem oberen Kontaktbelag 48 des Keramikkörpers 30 liegt ein metallischer Druckring 68 auf, an den sich der mittlere Ringbereich eines Federringes 70 abstützt, dessen innerer Ringrand federnd gegen die ebene Stirnseite des Düsenkörpers 10 drückt und dessen äußerer Ringrand sich an einer konischen Wandfläche des Düsenkörpers 10 zentriert.The end collar 28 of the union nut 12 has an inwardly directed annular shoulder 52, on which a metallic mounting sleeve 54 is seated, which is connected to the union nut 12 via an annular weld seam 56. The mounting sleeve 54 modeled on the inner contour of the ring collar 28 carries an electrically insulating ceramic ring 58, on the upper end face of which a metallic contact ring disk 60 is seated, on which the ceramic body 30 rests with its contact coating 44. The contact ring disk 60 has a laterally projecting and upwardly angled contact tongue 62 which passes through a local recess 64 in the mounting sleeve 54 and is connected to a power supply line 66 which is insulated and passed through the injection nozzle. On the upper contact surface 48 of the ceramic body 30 there is a metallic pressure ring 68 on which the middle ring area of a spring ring 70 is supported, the inner ring edge of which resiliently presses against the flat end face of the nozzle body 10 and the outer ring edge of which rests on a conical wall surface of the nozzle body 10 centered.

Beim Zusammenbau der Einspritzdüse werden zunächst der Keramikring 58, die Kontaktringscheibe 60, der bereits mit dem Heizelement 40 und dessen Anschlußelementen 42 bis 48 versehene Keramikkörper 30, sowie der Druckring 68 in der beschriebenen Reihenfolge in die Montagehülse 54 eingesetzt und danach mit dieser fest verbunden, z.B. durch einen Lötprozess. Danach bildet diese Teilegruppe den Glüheinsatz 26, welcher als Ganzes in die Überwurfmutter 12 von deren oberer Stirnseite her eingesetzt, bis zur Ringschulter 52 vorgeschoben und danach an der Uberwurfmutter 12 verschweißt wird. Danach können der Federing 70 und der Düsenkörper 10 in die Überwurfmutter 12 eingesetzt und durch diese am Düsenhalter festgespannt werden, wodurch sich der Federring 70 in der gewünschten Weise verspannt und den Ringspalt zwischen Düsenkörper 10 und Überwurfmutter 12 zum Durchgang 32 und zum Brennraum hin abdichtet.When assembling the injection nozzle, the ceramic ring 58, the contact ring disk 60, the ceramic body 30 already provided with the heating element 40 and its connecting elements 42 to 48 are first and the pressure ring 68 inserted in the order described in the mounting sleeve 54 and then firmly connected to it, for example by a soldering process. Then this group of parts forms the glow insert 26, which is inserted as a whole into the union nut 12 from its upper end face, advanced to the annular shoulder 52 and then welded to the union nut 12. Then the spring 70 and the nozzle body 10 can be inserted into the union nut 12 and clamped by this to the nozzle holder, as a result of which the spring ring 70 is braced in the desired manner and seals the annular gap between the nozzle body 10 and union nut 12 to the passage 32 and to the combustion chamber.

Claims (4)

1. Einrichtung zum Einspritzen von Kraftstoff in Brennräume von Brennkraftmaschinen, mit einer Einspritzdüse und einem nachgeschalteten Glühkörper, der einen hülsenförmigen Keramikkörper hat, welcher einen Durchgang für die Kraftstoff-Spritzstrahlen bildet und ein elektrisches Heizelement trägt, dessen beide Anschlüsse mit flächenhaften Kontaktelementen verbunden sind, die an einem Ringbund des Keramikkörpers fest angeordnet sind und von denen das eine mit dem Düsenkörper der Einspritzdüse und das andere mit einer gegenüber der Einspritzdüse isolierten Stromzuleitung kontaktiert ist, und ferner mit einem zwischen dem Düsenkörper und dem Ringbund des Keramikkörpers eingespannten Federring, der den Ringspalt zwischen diesen Teilen abdichtet, dadurch gekennzeichnet, daß das mit dem einen Anschluß (42) des Heizelementes (40) verbundene erste Kontaktelement (44) auf der vom Düsenkörper (10) abgekehrten unteren Ringseite des Ringbundes (36) am Keramikkörper (30) angeordnet und mit der Stromzuleitung (66) über ein Leitungselement (60, 62) verbunden ist, welches das mit dem anderen Anschluß (46) des Heizelementes (40) verbundene zweite Kontaktelement (48) isoliert umgeht, welches in bekannter Weise auf der dem Düsenkörper (10) zugekehrten oberen.Stirnseite des Ringbundes (36) am Keramikkörper (30) angeordnet und über den Federring (70) mit dem Düsenkörper (101'kontaktiert ist.1. Device for injecting fuel into combustion chambers of internal combustion engines, with an injection nozzle and a downstream incandescent body which has a sleeve-shaped ceramic body which forms a passage for the fuel spray jets and carries an electrical heating element, the two connections of which are connected to planar contact elements, which are fixedly arranged on an annular collar of the ceramic body and of which one is in contact with the nozzle body of the injection nozzle and the other with a power supply line which is insulated from the injection nozzle, and further with a spring ring clamped between the nozzle body and the annular collar of the ceramic body, which forms the annular gap Seals between these parts, characterized in that the first contact element (44) connected to the one connection (42) of the heating element (40) is arranged on the ceramic body (30) on the lower ring side of the ring collar (36) facing away from the nozzle body (10) and with the Stromz uleitung (66) is connected via a line element (60, 62), which bypasses the second contact element (48) connected to the other connection (46) of the heating element (40), which in a known manner faces the nozzle body (10) the upper end face of the collar (36) is arranged on the ceramic body (30) and is in contact with the nozzle body (101 ') via the spring ring (70). 2: Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Leitungselement (60, 62), welches das erste Kontaktelement (44) mit der Stromzuleitung (66) verbindet, eine unter dem Ringbund (36) des Keramikkörpers (30) liegende metallische Kontaktringscheibe (60) ist, die mindestens eine den Ringbund (36) seitlich umgehende Kontaktzunge (62) hat.2: Device according to claim 1, characterized in that the line element (60, 62), which connects the first contact element (44) to the power supply line (66), a metallic contact ring disc (under the ring collar (36) of the ceramic body (30)) 60) which has at least one contact tongue (62) which laterally circumferentially surrounds the annular collar (36). 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwischen dem Keramikkörper (30) und dem Federring (70) ein auf dem zweiten Kontaktelement (48) aufliegender metallischer Druckring (68) angeordnet ist.3. Device according to claim 1 or 2, characterized in that between the ceramic body (30) and the spring ring (70) on the second contact element (48) lying metallic pressure ring (68) is arranged. 4. Einrichtung nach Anspruch 2 oder 3, mit einer Einspritzdüse, dessen Düsenkörper durch eine Uberwurfmutter an einem Düsenhalter festgespannt ist, dadurch gekennzeichnet, daß der Keramikkörper (30), die Kontaktringscheibe (60) und ein darunter angeordneter ringförmiger Isolierkörper (58), sowie gegebenenfalls der Druckring (68) in eine Hülse (54) eingesetzt und darin befestigt sind, und daß die so gebildete Baueinheit (26) als Ganzes am brennraumseitigen Stirnende (28) der Überwurfmutter (12) befestigt ist.4. Device according to claim 2 or 3, with an injection nozzle, the nozzle body is clamped by a union nut to a nozzle holder, characterized in that the ceramic body (30), the contact ring disc (60) and an annular insulating body (58) arranged underneath, and optionally the pressure ring (68) is inserted into a sleeve (54) and fastened therein, and that the structural unit (26) thus formed is fastened as a whole to the front end (28) of the union nut (12) on the combustion chamber side.
EP87104392A 1986-04-26 1987-03-25 Apparatus for injecting fuel into the combustion chamber of an internal-combustion engine Expired EP0244619B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614226 1986-04-26
DE19863614226 DE3614226A1 (en) 1986-04-26 1986-04-26 DEVICE FOR INJECTING FUEL IN THE COMBUSTION ROOM OF INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0244619A1 true EP0244619A1 (en) 1987-11-11
EP0244619B1 EP0244619B1 (en) 1989-06-28

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EP87104392A Expired EP0244619B1 (en) 1986-04-26 1987-03-25 Apparatus for injecting fuel into the combustion chamber of an internal-combustion engine

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EP (1) EP0244619B1 (en)
JP (1) JP2513677B2 (en)
DE (2) DE3614226A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6543333B2 (en) 2001-06-01 2003-04-08 Visteon Global Technologies, Inc. Enriched cobalt-tin swashplate coating alloy

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307666A1 (en) * 1983-03-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Device for the injection of fuel into combustion chambers, especially combustion chambers of diesel engines
EP0129676A1 (en) * 1983-06-23 1985-01-02 Allied Corporation An improved glow plug having a resistive surface film heater
DE3414201A1 (en) * 1984-04-14 1985-10-17 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR INJECTING FUEL IN COMBUSTION ROOMS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307666A1 (en) * 1983-03-04 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Device for the injection of fuel into combustion chambers, especially combustion chambers of diesel engines
EP0129676A1 (en) * 1983-06-23 1985-01-02 Allied Corporation An improved glow plug having a resistive surface film heater
DE3414201A1 (en) * 1984-04-14 1985-10-17 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR INJECTING FUEL IN COMBUSTION ROOMS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6543333B2 (en) 2001-06-01 2003-04-08 Visteon Global Technologies, Inc. Enriched cobalt-tin swashplate coating alloy

Also Published As

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DE3614226A1 (en) 1987-10-29
JPS62261666A (en) 1987-11-13
DE3760281D1 (en) 1989-08-03
JP2513677B2 (en) 1996-07-03
EP0244619B1 (en) 1989-06-28

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