EP2649374A1 - Glow plug having a graphite seal and an electric insulating layer - Google Patents

Glow plug having a graphite seal and an electric insulating layer

Info

Publication number
EP2649374A1
EP2649374A1 EP11775780.7A EP11775780A EP2649374A1 EP 2649374 A1 EP2649374 A1 EP 2649374A1 EP 11775780 A EP11775780 A EP 11775780A EP 2649374 A1 EP2649374 A1 EP 2649374A1
Authority
EP
European Patent Office
Prior art keywords
glow tube
glow
pressed
graphite
connecting bolt
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.)
Granted
Application number
EP11775780.7A
Other languages
German (de)
French (fr)
Other versions
EP2649374B1 (en
Inventor
Andreas Reissner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2649374A1 publication Critical patent/EP2649374A1/en
Application granted granted Critical
Publication of EP2649374B1 publication Critical patent/EP2649374B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Definitions

  • the invention relates to a glow plug according to the preamble of claim 1 and a method for producing the glow plug.
  • the glow plugs of the prior art have a glow plug inserted into a metallic housing, which is designed with an glow tube and an incandescent tube arranged in the glow tube.
  • the incandescent filament is electrically contacted at one end in an opening of the glow tube with a connecting bolt and at the other end with the metallic glow tube.
  • the opening of the glow tube is sealed between glow tube and connecting bolt to protect the filament by means of a radiator seal against ambient air. So that no short circuit occurs between the glow tube and connecting bolt, the radiator seal is performed by a sealing element made of an elastomer.
  • the maximum temperature for the elastomeric sealing element is limited to 1000 hours for long-term use at 200 ° C.
  • a metallic sealing ring as a sealing element between the glow tube and the connecting bolt.
  • For electrical insulation of the metallic sealing ring of the connecting bolt is provided in the sealing area with an electrical insulating layer.
  • the metallic sealing ring is used as a solder joint, welded joint or sintered metal powder.
  • a glow plug by means of a sealing element made of graphite in a housing of
  • Glow plug is known from WO 2006/027280 AI known.
  • the glow plug according to the invention and the inventive method for producing the glow plug have the advantage that a safe and cost-effective radiator seal can be achieved, which withstands higher temperatures and manages without an additional cohesive connection.
  • the seal is achieved in that the sealing element made of graphite in the form of a pre-pressed Grafitrings is pushed in the region of the sealing portion on an insulating layer formed on the connecting bolt and the glow tube is pressed in the sealing portion on the graphite ring.
  • the pre-pressed graphite ring is much easier to reshape than a metallic sealing ring and also adapts better to the contiguous shapes of the glow tube and connecting bolt.
  • the electrical insulating layer is at least in the region of
  • the press connection between glow tube, sealing element and connecting bolt is achieved by the glow tube at least in the region of the sealing section has a diameter reduction, by means of which the sealing element is pressed as a graphite ring between the glow tube and connecting bolt.
  • An expedient method is a reduction in diameter of the glow tube which is carried out after assembly of the pre-pressed graphics, whereby the glow tube is pressed onto the graphite ring by rotary swaging.
  • Figure 2 shows an enlarged portion II of the glow plug in Figure 1 with a first embodiment of a radiator seal
  • FIG 3 shows the enlarged portion II of the glow plug in Figure 1 with a second embodiment of a Schuetzldichtung.
  • the glow plug shown in Figure 1 has a metallic housing 10 with a continuous longitudinal bore 12 in which a glow plug 14 is pressed as a radiator.
  • the glow plug 14 consists of a metallic glow tube 16, in which an incandescent filament 18 is arranged, which is contacted at one end with the glow tube 16 and at the other end with a terminal bolt 17 electrically.
  • the connecting bolt 17, which is led out of the housing 10 at the opposite end to the glow plug 14 with a connection 21, is surrounded within the housing 10 by an annular space 13, which in turn is sealed off from the surroundings.
  • the glow tube 16 is closed at the pointing into a combustion chamber of an internal combustion engine end and has at the opposite end to the annular space 13 toward an opening 22.
  • the connection bolt 17 is provided, for example, with an end bore 24 in which the incandescent filament 18 is inserted with a centering turn 25.
  • Essential for the life of the filament 18 is that the material of the filament 18 is protected from an oxidizing and nitriding atmosphere.
  • the interior of the glow tube 16 is closed at the opening 22 with a radiator seal 30.
  • the radiator seal 30 is formed by a sealing element 31 made of graphite and at least one electrical insulation.
  • the sealing element 31 made of graphite is electrically insulated in a sealing section 23 between the glow tube 16 and the connecting bolt 17 and pressed there, wherein the electrical insulation, the sealing element 31 made of graphite at least in the region of the sealing portion 23 against the
  • the sealing element 31 made of graphite encloses with the inner surface of the connecting bolt 17. On the outer peripheral surface of the sealing element 31 made of graphite, the glow tube 16 is pressed. The electrical insulation is necessary because graphite electrical see is conductive and a short circuit between the glow tube 16 and connecting bolt
  • the glow tube 16 at least in the region of the sealing portion 23 has a diameter reduction 26, by means of which the sealing element 31 is pressed from graphite between the glow tube 16 and the terminal bolt 17.
  • the electrical insulation is formed by an electrical insulating layer 32 applied to the connecting bolt 17.
  • the sealing element 31 made of graphite is pressed between the insulating layer 32 and the glow tube 16.
  • the electrical insulation is carried out by an electrical insulation layer 33 formed in the opening 22 in the region of the sealing section 23 on the inner wall of the glow tube 16.
  • the sealing element 31 made of graphite is pressed between the insulating layer 33 and the connecting bolt 17.
  • the electrical insulation layers 32 and 33 may consist, for example, of glass, silicate, borosilicate or bosilicate glass, metal oxides, metal nitrides or metal oxynitrides and be deposited by means of processes known per se, for example by means of gas phase deposition on the connection bolts 17 and / or on the inner wall of the glow tube 16 applied.
  • An effective radiator seal 30 between glow tube 16 and connecting bolt 17 is realized by the sealing element 31 is pushed in the form of a pre-pressed Grafitrings on the connecting bolt 17 in the region of the electrical insulation layer 32, 33, so that the pre-pressed graphite ring in the opening 22nd of the glow tube 16 in the region of the sealing portion 23 is located. Subsequently, the glow tube 16 is reduced, for example, by swaging in diameter in the form of the diameter reduction 26, whereby the glow tube 16 is pressed in the region of the sealing portion 23 on the pre-pressed graphite ring. As a result, the pre-pressed graphite ring in the opening 22 of the glow tube 16 in the region of the sealing portion 23 between the glow tube 16 and terminal bolt 17 is pressed. The graphite ring used in vorgepresster form is deformed, thereby forming between the glow tube 16 and connecting bolt 17, the sealing element 31 made of graphite and thus the radiator seal 30 is formed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Gasket Seals (AREA)

Abstract

The invention relates to a glow plug comprising a sheathed element which is accommodated in a metallic housing. The sheathed element comprises a glow tube (16) and a coiled element (18) arranged in the glow tube (16), wherein one end of the coiled element (18) is in electrical contact with the glow tube (16) and the other end is in electrical contact with a connecting pin (17). The connecting pin (17) protrudes into an axial opening (22) of the glow tube (16) where it is connected in a sealing section (23) to the glow tube (16) in an electrically insulating manner by means of a heating body seal (30). The heating body seal (30) is embodied with a sealing element (31) made of graphite and at least one electric insulating layer (32), wherein the glow tube (16) is pressed with the sealing element (31) made of graphite on the connecting pin (17). In order to produce the heating body seal (30), a pre-pressed graphite ring (31) is pressed in the opening (22) of the glow tube (16) in the sealing section (23) between glow tube (16) and connecting pin (17).

Description

GLÜHKERZE MIT GRAPHITDICHTUNG UND ELEKTRISCHER ISOLIERSCHICHT  GLOW PLUG WITH GRAPHITE SEAL AND ELECTRIC INSULATION LAYER
Die Erfindung betrifft eine Glühkerze nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zur Herstellung der Glühkerze. The invention relates to a glow plug according to the preamble of claim 1 and a method for producing the glow plug.
Stand der Technik Die Glühkerzen des Standes der Technik weisen einen in ein metallisches Gehäuse eingesetzten Glühstift auf, der mit einem Glührohr und einer im Glührohr angeordneten Glühwendel ausgeführt ist. Die Glühwendel ist an einem Ende in einer Öffnung des Glührohres mit einem Anschlussbolzen und am anderen Ende mit dem metallischen Glührohr elektrisch kontaktiert. Die Öffnung des Glührohres ist zwischen Glührohr und Anschlussbolzen zum Schutz der Glühwendel mittels einer Heizkörperdichtung gegen Umgebungsluft abgedichtet. Damit zwischen dem Glührohr und Anschlussbolzen kein Kurzschluss entsteht ist die Heizkörperdichtung durch ein Dichtelement aus einem Elastomer ausgeführt. Die Maximaltemperatur für das Dichtelement aus Elastomer ist bei langfristigem Einsatz bei 200 °C auf 1000 Stunden beschränkt. Beim Einsatz in Verbrennungsmotoren spielt diese Einsatzgrenze eine untergeordnete Rolle, da der Zylinderkopf der Verbrennungsmotoren, in die Glühkerze mit dem Gehäuse eingeschraubt wird, unter 200 °C gekühlt wird. Es ist auch denkbar, Glühkerzen außerhalb des gekühlten Motorblocks einzusetzen, z. B. im Abgasstrang eines Kraftfahrzeugs, in Injektionsbrennern zum Beheizen des Abgasstrangs, in Zuheizeinrichtungen für Kraftfahrzeuge oder für Anwendungsbereiche außerhalb von Kraftfahrzeugen, z. B. als Zündquelle für Pellet-Heizungen. Bei derartigen Anwendungen, in denen die Umgebung der Glühkerze nicht mehr gekühlt wird, kann ein Elastomer nicht mehr als Dichtelement eingesetzt werden. PRIOR ART The glow plugs of the prior art have a glow plug inserted into a metallic housing, which is designed with an glow tube and an incandescent tube arranged in the glow tube. The incandescent filament is electrically contacted at one end in an opening of the glow tube with a connecting bolt and at the other end with the metallic glow tube. The opening of the glow tube is sealed between glow tube and connecting bolt to protect the filament by means of a radiator seal against ambient air. So that no short circuit occurs between the glow tube and connecting bolt, the radiator seal is performed by a sealing element made of an elastomer. The maximum temperature for the elastomeric sealing element is limited to 1000 hours for long-term use at 200 ° C. When used in internal combustion engines, this use limit plays a minor role, since the cylinder head of the internal combustion engines, is screwed into the glow plug with the housing, cooled below 200 ° C. It is also conceivable to use glow plugs outside of the cooled engine block, z. B. in the exhaust system of a motor vehicle, in injection burners for heating the exhaust line, in Zuheizeinrichtungen for motor vehicles or for applications outside of motor vehicles, eg. B. as an ignition source for pellet heaters. In such applications where the environment of the Glow plug is no longer cooled, an elastomer can not be used as a sealing element.
Aus WO 2010/027697 ist bekannt, als Dichtelement zwischen Glührohr und An- schlussbolzen einen metallischen Dichtring einzusetzen. Zur elektrischen Isolierung des metallischen Dichtring ist der Anschlussbolzen im Dichtbereich mit einer elektrischen Isolierschicht versehen. Der metallische Dichtring wird dabei als Lötverbindung, Schweißverbindung oder als gesinteres Metallpulver eingesetzt. Einen Glühstift mittels eines Dichtelements aus Grafit in einem Gehäuse derFrom WO 2010/027697 it is known to use a metallic sealing ring as a sealing element between the glow tube and the connecting bolt. For electrical insulation of the metallic sealing ring of the connecting bolt is provided in the sealing area with an electrical insulating layer. The metallic sealing ring is used as a solder joint, welded joint or sintered metal powder. A glow plug by means of a sealing element made of graphite in a housing of
Glühkerze dicht aufzunehmen ist aus WO 2006/027280 AI bekannt. Glow plug is known from WO 2006/027280 AI known.
Offenbarung der Erfindung Disclosure of the invention
Die erfindungsgemäße Glühkerze und das erfindungsgemäße Verfahren zur Herstellung der Glühkerze haben den Vorteil, dass eine sichere und kostengünstige Heizkörperdichtung erzielbar ist, die höheren Temperaturen standhält und ohne eine zusätzliche stoffschlüssige Verbindung auskommt. Die Abdichtung kommt dabei dadurch zustande, dass das Dichtelement aus Grafit in Form eines vorgepressten Grafitrings im Bereich des Dichtungsabschnitts auf eine am Anschlussbolzen ausgebildete Isolationsschicht aufgeschoben wird und das Glührohr im Bereich Dichtungsabschnitts auf den Grafitring aufgepresst wird. Der vor- gespresste Grafitring lässt sich wesentlich einfacher umformen als ein metallischer Dichtring und passt sich außerdem besser an die angrenzenden Formen von Glührohr und Anschlussbolzen an. The glow plug according to the invention and the inventive method for producing the glow plug have the advantage that a safe and cost-effective radiator seal can be achieved, which withstands higher temperatures and manages without an additional cohesive connection. The seal is achieved in that the sealing element made of graphite in the form of a pre-pressed Grafitrings is pushed in the region of the sealing portion on an insulating layer formed on the connecting bolt and the glow tube is pressed in the sealing portion on the graphite ring. The pre-pressed graphite ring is much easier to reshape than a metallic sealing ring and also adapts better to the contiguous shapes of the glow tube and connecting bolt.
Vorteilhafte Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche möglich. Zweckmäßigerweise wird die elektrische Isolierschicht zumindest im Bereich desAdvantageous developments of the invention are possible by the features of the subclaims. Conveniently, the electrical insulating layer is at least in the region of
Dichtungsabschnitts am Anschlussbolzen und/oder zumindest im Bereich des Dichtungsabschnitts in der Öffnung an der Innenwand des Glührohres ausgebildet. Die Pressverbindung zwischen Glührohr, Dichtelement und Anschlussbolzen wird dadurch erzielt, indem das Glührohr zumindest im Bereich des Dichtungs- abschnittes eine Durchmesserreduzierung aufweist, mittels welcher das Dichtelement als Grafitring zwischen Glührohr und Anschlussbolzen verpresst wird. Seal portion formed on the connecting bolt and / or at least in the region of the sealing portion in the opening on the inner wall of the glow tube. The press connection between glow tube, sealing element and connecting bolt is achieved by the glow tube at least in the region of the sealing section has a diameter reduction, by means of which the sealing element is pressed as a graphite ring between the glow tube and connecting bolt.
Als zweckmäßiges Verfahren eignet sich eine nach der Montage des vorgepress- ten Grafitrings durchgeführte Durchmesserreduzierung des Glührohres, wodurch das Glührohr auf den Grafitring durch Rundkneten auf gepresst wird. An expedient method is a reduction in diameter of the glow tube which is carried out after assembly of the pre-pressed graphics, whereby the glow tube is pressed onto the graphite ring by rotary swaging.
Ausführungsbeispiele embodiments
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
Es zeigen: Show it:
Figur 1 eine Schnittdarstellung durch eine Glühkerze,  1 shows a sectional view through a glow plug,
Figur 2 einen vergrößerten Abschnitt II der Glühkerze in Figur 1 mit einer ersten Ausführungsform einer Heizkörperdichtung und  Figure 2 shows an enlarged portion II of the glow plug in Figure 1 with a first embodiment of a radiator seal and
Figur 3 der vergrößerte Abschnitt II der Glühkerze in Figur 1 mit einer zweiten Ausführungsform einer Heizwendeldichtung.  3 shows the enlarged portion II of the glow plug in Figure 1 with a second embodiment of a Heizwendeldichtung.
Die in Figur 1 dargestellte Glühkerze weist ein metallisches Gehäuse 10 mit einer durchgehenden Längsbohrung 12 auf, in der ein Glühstift 14 als Heizkörper ein- gepresst ist. Der Glühstift 14 besteht aus einem metallischen Glührohr 16, in dem ein Glühwendel 18 angeordnet ist, die an einem Ende mit dem Glührohr 16 und am anderen Ende mit einem Anschlussbolzen 17 elektrisch kontaktiert ist. Der Anschlussbolzen 17, der an dem zum Glühstift 14 gegenüberliegenden Ende mit einem Anschluss 21 aus dem Gehäuse 10 herausgeführt ist, ist innerhalb des Gehäuses 10 von einem Ringraum 13 umgeben, der wiederum gegenüber der Umgebung abgeschlossen ist. The glow plug shown in Figure 1 has a metallic housing 10 with a continuous longitudinal bore 12 in which a glow plug 14 is pressed as a radiator. The glow plug 14 consists of a metallic glow tube 16, in which an incandescent filament 18 is arranged, which is contacted at one end with the glow tube 16 and at the other end with a terminal bolt 17 electrically. The connecting bolt 17, which is led out of the housing 10 at the opposite end to the glow plug 14 with a connection 21, is surrounded within the housing 10 by an annular space 13, which in turn is sealed off from the surroundings.
Das Glührohr 16 ist an dem in einen Brennraum einer Brennkraftmaschine weisenden Ende geschlossen und weist am dazu gegenüberliegenden Ende zum Ringraum 13 hin eine Öffnung 22 auf. Zur Kontaktierung der Glühwendel 18 ist gemäß Figur 2 und 3 der Anschlussbolzen 17 zum Beispiel mit einer stirnseitigen Bohrung 24 versehen, in der die Glühwendel 18 mit einer Zentrierwindung 25 eingesetzt ist. Wesentlich für die Lebensdauer der Glühwendel 18 ist, dass das Material der Glühwendel 18 gegenüber einer oxidierenden und nitrierenden Atmosphäre geschützt ist. Dazu ist der Innenraum des Glührohres 16 an der Öffnung 22 mit ei- ner Heizkörperdichtung 30 verschlossen. Die Heizkörperdichtung 30 wird von einem Dichtelement 31 aus Grafit und mindestens einer elektrischen Isolierung gebildet. Das Dichtelement 31 aus Graphit ist in einem Dichtungsabschnitt 23 zwischen dem Glührohr 16 und dem Anschlussbolzen 17 elektrisch isoliert angeordnet und dort verpresst, wobei die elektrische Isolierung das Dichtelement 31 aus Grafit zumindest im Bereich des Dichtungsabschnitts 23 gegenüber demThe glow tube 16 is closed at the pointing into a combustion chamber of an internal combustion engine end and has at the opposite end to the annular space 13 toward an opening 22. In order to make contact with the incandescent filament 18, according to FIGS. 2 and 3, the connection bolt 17 is provided, for example, with an end bore 24 in which the incandescent filament 18 is inserted with a centering turn 25. Essential for the life of the filament 18 is that the material of the filament 18 is protected from an oxidizing and nitriding atmosphere. For this purpose, the interior of the glow tube 16 is closed at the opening 22 with a radiator seal 30. The radiator seal 30 is formed by a sealing element 31 made of graphite and at least one electrical insulation. The sealing element 31 made of graphite is electrically insulated in a sealing section 23 between the glow tube 16 and the connecting bolt 17 and pressed there, wherein the electrical insulation, the sealing element 31 made of graphite at least in the region of the sealing portion 23 against the
Glührohr 16 und/oder dem Anschlussbolzen 17 elektrisch isoliert. Der Dichtelement 31 aus Grafit umschließt dabei mit der inneren Fläche den Anschlussbolzen 17. Auf die äußere Umfangsfläche des Dichtelements 31 aus Grafit wird das Glührohr 16 gepresst. Die elektrische Isolierung ist notwendig, weil Grafit elektri- sehe leitend ist und ein Kurzschluss zwischen Glührohr 16 und AnschlussbolzenGlow tube 16 and / or the connection pin 17 electrically isolated. The sealing element 31 made of graphite encloses with the inner surface of the connecting bolt 17. On the outer peripheral surface of the sealing element 31 made of graphite, the glow tube 16 is pressed. The electrical insulation is necessary because graphite electrical see is conductive and a short circuit between the glow tube 16 and connecting bolt
17 vermieden werden muss. Zur Ausbildung der Heizkörperdichtung 30 weist das Glührohr 16 zumindest im Bereich des Dichtungsabschnitts 23 eine Durchmesserreduzierung 26 auf, mittels welcher das Dichtelement 31 aus Grafit zwischen Glührohr 16 und dem Anschlussbolzen 17 verpresst ist. 17 must be avoided. To form the radiator seal 30, the glow tube 16 at least in the region of the sealing portion 23 has a diameter reduction 26, by means of which the sealing element 31 is pressed from graphite between the glow tube 16 and the terminal bolt 17.
Beim Ausführungsbeispiel gemäß Figur 2 ist die elektrische Isolierung von einer auf dem Anschlussbolzen 17 aufgebrachten elektrischen Isolationsschicht 32 gebildet. Das Dichtelement 31 aus Grafit ist zwischen Isolationsschicht 32 und Glührohr 16 verpresst. In the embodiment according to FIG. 2, the electrical insulation is formed by an electrical insulating layer 32 applied to the connecting bolt 17. The sealing element 31 made of graphite is pressed between the insulating layer 32 and the glow tube 16.
Beim Ausführungsbeispiel gemäß Figur 3 ist die elektrische Isolierung von einer in der Öffnung 22 im Bereich des Dichtungsabschnitts 23 an der Innenwand des Glührohres 16 ausgebildeten elektrischen Isolationsschicht 33 ausgeführt. Das Dichtelement 31 aus Grafit ist zwischen Isolationsschicht 33 und Anschlussbol- zen 17 verpresst. In the embodiment according to FIG. 3, the electrical insulation is carried out by an electrical insulation layer 33 formed in the opening 22 in the region of the sealing section 23 on the inner wall of the glow tube 16. The sealing element 31 made of graphite is pressed between the insulating layer 33 and the connecting bolt 17.
Es ist aber auch denkbar sowohl am Anschlussbolzen 17 als auch an der Innenwand des Glührohres 16 jeweils eine elektrische Isolationsschicht 32, 33 auszubilden und das Dichtelement 31 aus Grafit dann zwischen den Isolationsschich- ten zu verpressen. Die elektrischen Isolationsschichten 32 und 33 können beispielsweise aus Glas, Silikat-, Bor- oder Bosilikatglas, Metalloxiden, Metallnitride oder Metalloxynitride bestehen und werden durch an sich bekannten Verfahren, z.B. mittels Gaspha- senabscheidung auf den Anschlussbolzen 17 und/oder an der Innenwand des Glührohres 16 aufgebracht. However, it is also conceivable to form an electrical insulation layer 32, 33 both on the connection bolt 17 and on the inner wall of the glow tube 16 and then press the sealing element 31 made of graphite between the insulation layers. The electrical insulation layers 32 and 33 may consist, for example, of glass, silicate, borosilicate or bosilicate glass, metal oxides, metal nitrides or metal oxynitrides and be deposited by means of processes known per se, for example by means of gas phase deposition on the connection bolts 17 and / or on the inner wall of the glow tube 16 applied.
Eine wirksame Heizkörperdichtung 30 zwischen Glührohr 16 und Anschlussbolzen 17 wird dadurch realisiert, indem das Dichtelement 31 im Form eines vorge- pressten Grafitrings auf den Anschlussbolzen 17 im Bereich der elektrischen Isolationsschicht 32, 33 aufgeschoben wird, so dass sich der vorgepresste Grafitring in der Öffnung 22 des Glührohres 16 im Bereich des Dichtungsabschnitts 23 befindet. Nachfolgend wird das Glührohr 16 beispielsweise durch Rundkneten im Durchmesser in Form der Durchmesserreduzierung 26 reduziert, wodurch sich das Glührohr 16 im Bereich des Dichtungsabschnitts 23 auf den vorgepressten Grafitring presst. Dadurch wird der vorgepresste Grafitring in der Öffnung 22 des Glührohres 16 im Bereich des Dichtungsabschnitts 23 zwischen Glührohr 16 und Anschlussbolzen 17 verpresst. Der in vorgepresster Form eingesetzte Grafitring wird dabei verformt, wodurch sich zwischen Glührohr 16 und Anschlussbolzen 17 das Dichtelement 31 aus Grafit ausbildet und dadurch die Heizkörperdichtung 30 entsteht. An effective radiator seal 30 between glow tube 16 and connecting bolt 17 is realized by the sealing element 31 is pushed in the form of a pre-pressed Grafitrings on the connecting bolt 17 in the region of the electrical insulation layer 32, 33, so that the pre-pressed graphite ring in the opening 22nd of the glow tube 16 in the region of the sealing portion 23 is located. Subsequently, the glow tube 16 is reduced, for example, by swaging in diameter in the form of the diameter reduction 26, whereby the glow tube 16 is pressed in the region of the sealing portion 23 on the pre-pressed graphite ring. As a result, the pre-pressed graphite ring in the opening 22 of the glow tube 16 in the region of the sealing portion 23 between the glow tube 16 and terminal bolt 17 is pressed. The graphite ring used in vorgepresster form is deformed, thereby forming between the glow tube 16 and connecting bolt 17, the sealing element 31 made of graphite and thus the radiator seal 30 is formed.

Claims

Ansprüche claims
1. Glühkerze mit einem metallischen Gehäuse (10), welches eine Längsbohrung (12) aufweist, in der ein Glühstift (14) aufgenommen ist, welcher ein Glührohr (16) und eine im Glührohr (16) angeordnete Glühwendel (18) aufweist, wobei die Glühwendel (18) an einem Ende mit dem Glührohr (16) und am anderen Ende mit einem Anschlussbolzen (17) elektrisch kontaktiert ist, wobei der Anschlussbolzen (17) in eine axiale Öffnung (22) des Glührohres (16) hineinragt und dort in einem Dichtungsabschnitt (23) mittels einer Heizkörperdichtung (30) elektrisch isolierend mit dem Glührohr (16) verbunden ist, dadurch gekennzeichnet, dass die Heizkörperdichtung (30) mit einem Dichtelement (31) aus Grafit und mindestens einer elektrischen Isolierschicht (32, 33) ausgeführt ist, und dass das Glührohr (16) mit dem Dichtelement (31) aus Grafit auf den Anschlussbolzen (17) gepresst ist. Has a glow plug with a metallic housing (10) having a longitudinal bore (12) in which a glow plug (14) is accommodated, which has a glow tube (16) and in the glow tube (16) arranged incandescent filament (18) the filament (18) at one end with the glow tube (16) and at the other end with a connecting bolt (17) is electrically contacted, wherein the connecting bolt (17) projects into an axial opening (22) of the glow tube (16) and there in a sealing section (23) by means of a radiator seal (30) is electrically insulating connected to the glow tube (16), characterized in that the radiator seal (30) with a sealing element (31) made of graphite and at least one electrical insulating layer (32, 33) is, and that the glow tube (16) is pressed with the sealing element (31) made of graphite on the connecting bolt (17).
2. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, dass die elektrische Isolierschicht (32) zumindest im Bereich des Dichtungsabschnitts (23) am Anschlussbolzen (17) ausgebildet ist. 2. Glow plug according to claim 1, characterized in that the electrical insulating layer (32) is formed at least in the region of the sealing portion (23) on the connecting bolt (17).
3. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, dass die elektrische Isolierschicht (33) zumindest im Bereich des Dichtungsabschnitts (23) an der Innenwand des Glührohres (16) ausgebildet ist. 3. Glow plug according to claim 1, characterized in that the electrical insulating layer (33) is formed at least in the region of the sealing portion (23) on the inner wall of the glow tube (16).
4. Glühkerze nach Anspruch 1, dadurch gekennzeichnet, dass zumindest im Bereich des Dichtungsabschnitts (23) am Anschlussbolzen (17) und an der Innenwand des Glührohres (16) jeweils eine elektrische Isolierschicht (32, 33) ausgebildet ist. 4. A glow plug according to claim 1, characterized in that at least in the region of the sealing portion (23) on the connecting bolt (17) and on the inner wall of the glow tube (16) each having an electrical insulating layer (32, 33) is formed.
Glühkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Glührohr (16) zumindest im Bereich des Dichtungsab- Schnitts (23) eine Durchmesserreduzierung (26) aufweist, mittels welcher das Dichtelement (31) aus Grafit mit dem Anschlussbolzen (17) verpresst ist. Glow plug according to one of the preceding claims, characterized in that the glow tube (16) at least in the region of the sealing Ab- Section (23) has a diameter reduction (26), by means of which the sealing element (31) made of graphite with the connecting bolt (17) is pressed.
6. Verfahren zur Herstellung der Glühkerze nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Dichtelement (31) in Form eines vorgepressten Grafitrings auf den Anschlussbolzen (17) im Bereich des Dichtungsabschnitts (23) angeordnet wird, und dass anschließend der vorgepresste Grafitring in der Öffnung (22) des Glührohres (16) im Dichtungsabschnitt (23) zwischen Glührohr (16) und Anschlussbolzen (17) verpresst wird. 6. A method for producing the glow plug according to one of the preceding claims, characterized in that the sealing element (31) in the form of a pre-pressed Grafitrings on the connecting bolt (17) in the region of the sealing portion (23) is arranged, and that subsequently the pre-pressed graphite ring in the opening (22) of the glow tube (16) in the sealing portion (23) between the glow tube (16) and connecting bolt (17) is pressed.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Glührohr (16) zumindest im Bereich des Dichtungsabschnitts (23) durch Rundkneten eine Durchmesserreduzierung (26) erfährt, durch die der vorgepresste Grafitring zwischen Glührohr (16) und Anschlussbolzen (17) verpresst wird. 7. The method according to claim 6, characterized in that the glow tube (16) at least in the region of the sealing portion (23) by swaging a diameter reduction (26) experiences, by which the pre-pressed graphite ring between the glow tube (16) and terminal bolt (17) is pressed ,
EP11775780.7A 2010-12-06 2011-10-26 Glow plug having a graphite seal and an electric insulating layer Active EP2649374B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062438A DE102010062438A1 (en) 2010-12-06 2010-12-06 Glow plug and method for its production
PCT/EP2011/068708 WO2012076246A1 (en) 2010-12-06 2011-10-26 Glow plug having a graphite seal and an electric insulating layer

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EP2649374A1 true EP2649374A1 (en) 2013-10-16
EP2649374B1 EP2649374B1 (en) 2014-10-08

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EP (1) EP2649374B1 (en)
CN (1) CN103250002B (en)
DE (1) DE102010062438A1 (en)
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Publication number Priority date Publication date Assignee Title
FR3025153B1 (en) * 2014-09-01 2016-12-09 Bosch Gmbh Robert GLOW PLUG
CN104439693A (en) * 2014-12-08 2015-03-25 西安创新精密仪器研究所 Rotary forging connection process for homogeneous or heterogeneous metal tubes and bars
DE102015205665A1 (en) * 2015-03-30 2016-10-06 Robert Bosch Gmbh Glow plug with a glow plug and internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE1119597B (en) * 1958-11-13 1961-12-14 Bosch Gmbh Robert Glow plug for internal combustion engines
DE4335292A1 (en) * 1993-10-15 1995-04-20 Beru Werk Ruprecht Gmbh Co A Glow plug
IT235871Y1 (en) * 1995-05-31 2000-07-18 Cooper Ind Inc SELF-CLEANING OSCILLATING GASKET FOR AN ARMORED RESISTANCE OF A PRE-HEATING CANDLE FOR DIESEL ENGINES
DE19914619A1 (en) * 1999-03-31 2000-10-12 Beru Ag Method for sealing the connection-side end region of the glow tube of a glow plug and glow plugs with a closure according to the method
DE102004043874A1 (en) 2004-09-10 2006-03-16 Robert Bosch Gmbh Device for detecting the pressure in a combustion chamber of an internal combustion engine
US20090184101A1 (en) * 2007-12-17 2009-07-23 John Hoffman Sheathed glow plug
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Also Published As

Publication number Publication date
EP2649374B1 (en) 2014-10-08
WO2012076246A1 (en) 2012-06-14
CN103250002B (en) 2015-04-01
CN103250002A (en) 2013-08-14
DE102010062438A1 (en) 2012-06-06

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