EP2649375B1 - Glow plug and method for the production thereof - Google Patents

Glow plug and method for the production thereof Download PDF

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Publication number
EP2649375B1
EP2649375B1 EP11776444.9A EP11776444A EP2649375B1 EP 2649375 B1 EP2649375 B1 EP 2649375B1 EP 11776444 A EP11776444 A EP 11776444A EP 2649375 B1 EP2649375 B1 EP 2649375B1
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EP
European Patent Office
Prior art keywords
glow
glow tube
tube
insulation layer
electrical insulation
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.)
Active
Application number
EP11776444.9A
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German (de)
French (fr)
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EP2649375A1 (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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2649375A1 publication Critical patent/EP2649375A1/en
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Publication of EP2649375B1 publication Critical patent/EP2649375B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

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 embodied with an incandescent tube and an incandescent tube arranged in the incandescent 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.
  • WO 2010/027697 It is known to use a metallic sealing ring as a sealing element between the glow tube and connecting bolt.
  • a metallic sealing ring 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.
  • From the EP 1041343 is a method of sealingly sealing a connection side. End region of a glow tube of a glow plug known.
  • the glow plug according to the invention and the inventive method for producing the glow plug have the advantage that a safe and inexpensive radiator seal can be achieved, which achieves high temperature resistance, because the operating temperature of the radiator seal is limited only by the properties of the electrical insulating layer. Depending on the material used for the electrical insulating layer, the operating temperature is limited only by the material for the glow tube, the connecting bolt and the housing. In this case, the connection-side region of the glow plug can be exposed to the same temperatures in extreme cases as in the annealing range of the glow plug.
  • the electrical insulating layer is formed at least in the region of the sealing portion on the connecting bolt and / or 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 has a diameter reduction at least in the region of the sealing portion, by means of which the glow tube is pressed onto the connecting bolt.
  • glow plug 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 electrically contacted at one end with the glow tube 16 and at the other end with a terminal bolt 17.
  • 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 radiator seal 30 is formed by at least one electrical insulating layer 33 and a press connection of the glow tube 16 in the region of the electrical insulating layer 33 with the connecting bolt 17.
  • the electrical insulating layer 33 is according to FIG. 2 formed at the connecting bolt 17 at least in the region of the sealing portion 23. However, the electrical insulating layer 33 may also be formed at least in the region of the sealing portion 23 on the inner wall of the glow tube 16 or 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.
  • the electrical insulating layer 33 may consist for example of glass, silicate, boron or Bosilikatglas, metal oxides, metal nitrides or metal oxynitrides.
  • the electrical insulation layer 33 is applied by methods known per se, e.g. by means of vapor deposition.
  • the electrical insulating layer 33 is first applied to the connecting bolt 17 and / or on the inner wall of the glow tube 16.
  • a gas-tight connection between the glow tube 16 and connecting bolt 17 in the region of the sealing portion 23 is produced.
  • the sealing section 23 extends exclusively to the region of the electrical insulating layer 33 so that no electrical short circuit between the connecting pin 17 and the glow tube 16 is formed.
  • the diameter of the glow tube 16 is provided in the sealing portion 23, for example by means of rotary swaging with a diameter reduction 26, by means of which the glow tube 16 is pressed with the diameter of the electrical insulating layer 33 on the connecting bolt 17.

Description

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 TechnikState of the art

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.The glow plugs of the prior art have a glow plug inserted into a metallic housing, which is embodied with an incandescent tube and an incandescent tube arranged in the incandescent 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.

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.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 Anschlussbolzen 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 gesintertes Metallpulver eingesetzt.Out WO 2010/027697 It is known to use a metallic sealing ring as a sealing element between the glow tube and 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.

Aus der EP 1041343 ist ein Verfahren zum abdichtenden Verschließen eines anschlussseitigen. Endbereichs eines Glührohrs einer Glühkerze bekannt.From the EP 1041343 is a method of sealingly sealing a connection side. End region of a glow tube of a glow plug known.

Offenbarung der ErfindungDisclosure 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 eine hohe Temperaturbeständigkeit erreicht, weil die Einsatztemperatur der Heizkörperdichtung nur durch die Eigenschaften der elektrischen Isolierschicht begrenzt wird. Je nach verwendetem Material für die elektrische Isolierschicht ist die Einsatztemperatur nur noch durch den Werkstoff für das Glührohr, den Anschlussbolzen und das Gehäuse begrenzt. In diesem Fall kann der anschlussseitige Bereich der Glühkerze im Extremfall gleichen Temperaturen ausgesetzt werden wie im Glühbereich des Glühstifts.The glow plug according to the invention and the inventive method for producing the glow plug have the advantage that a safe and inexpensive radiator seal can be achieved, which achieves high temperature resistance, because the operating temperature of the radiator seal is limited only by the properties of the electrical insulating layer. Depending on the material used for the electrical insulating layer, the operating temperature is limited only by the material for the glow tube, the connecting bolt and the housing. In this case, the connection-side region of the glow plug can be exposed to the same temperatures in extreme cases as in the annealing range of the glow plug.

Vorteilhafte Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche möglich.Advantageous developments of the invention are possible by the features of the subclaims.

Zweckmäßigerweise wird die elektrische Isolierschicht zumindest im Bereich des Dichtungsabschnitts am Anschlussbolzen und/oder an der Innenwand des Glührohres ausgebildet. Die Pressverbindung zwischen Glührohr, Dichtelement und Anschlussbolzen wird dadurch erzielt, indem das Glührohr zumindest im Bereich des Dichtungsabschnittes eine Durchmesserreduzierung aufweist, mittels welcher das Glührohr auf den Anschlussbolzen gepresst wird.Advantageously, the electrical insulating layer is formed at least in the region of the sealing portion on the connecting bolt and / or 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 has a diameter reduction at least in the region of the sealing portion, by means of which the glow tube is pressed onto the connecting bolt.

Ausführungsbeispielembodiment

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description.

Es zeigen:

  • Figur 1 eine Schnittdarstellung durch eine Glühkerze und
  • Figur 2 einen vergrößerten Abschnitt II der Glühkerze in Figur 1.
Show it:
  • FIG. 1 a sectional view through a glow plug and
  • FIG. 2 an enlarged section II of the glow plug in FIG. 1 ,

Die in Figur 1 dargestellte Glühkerze weist ein metallisches Gehäuse 10 mit einer durchgehenden Längsbohrung 12 auf, in der ein Glühstift 14 als Heizkörper eingepresst 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.In the FIG. 1 illustrated glow plug 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 electrically contacted at one end with the glow tube 16 and at the other end with a terminal bolt 17. 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.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.

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 einer Heizkörperdichtung 30 verschlossen. Die Heizkörperdichtung 30 wird von mindestens einer elektrischen Isolierschicht 33 und einer Pressverbindung des Glührohres 16 im Bereich der elektrischen Isolierschicht 33 mit dem Anschlussbolzen 17 gebildet.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 at least one electrical insulating layer 33 and a press connection of the glow tube 16 in the region of the electrical insulating layer 33 with the connecting bolt 17.

Die elektrische Isolierschicht 33 ist gemäß Figur 2 zumindest im Bereich des Dichtungsabschnitts 23 am Anschlussbolzen 17 ausgebildet. Die elektrische Isolierschicht 33 kann aber genauso zumindest im Bereich des Dichtungsabschnitts 23 an der Innenwand des Glührohres 16 oder zumindest im Bereich des Dichtungsabschnitts 23 am Anschlussbolzen 17 und an der Innenwand des Glührohres 16 ausgebildet sein.The electrical insulating layer 33 is according to FIG. 2 formed at the connecting bolt 17 at least in the region of the sealing portion 23. However, the electrical insulating layer 33 may also be formed at least in the region of the sealing portion 23 on the inner wall of the glow tube 16 or 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.

Die elektrische Isolierschicht 33 kann beispielsweise aus Glas, Silikat-, Bor- oder Bosilikatglas, Metalloxiden, Metallnitriden oder Metalloxynitriden bestehen. Aufgebracht wird die elektrische Isolierschicht 33 durch an sich bekannte Verfahren, z.B. mittels Gasphasenabscheidung.The electrical insulating layer 33 may consist for example of glass, silicate, boron or Bosilikatglas, metal oxides, metal nitrides or metal oxynitrides. The electrical insulation layer 33 is applied by methods known per se, e.g. by means of vapor deposition.

Zur Herstellung der Heizkörperdichtung 30 wird zunächst auf dem Anschlussbolzen 17 und/oder an der Innenwand des Glührohres 16 die elektrische Isolierschicht 33 aufgebracht. Zur Ausbildung der Heizkörperdichtung 30 wird eine gasdichte Verbindung zwischen Glührohr 16 und Anschlussbolzen 17 im Bereich des Dichtungsabschnitts 23 hergestellt. Der Dichtungsabschnitt 23 erstreckt sich dabei ausschließlich auf den Bereich der elektrischen Isolierschicht 33 damit kein elektrischer Kurzschluss zwischen Anschlussbolzen 17 und Glührohr 16 entsteht. Dazu wird der Durchmesser des Glührohres 16 im Dichtungsabschnitt 23 beispielsweise mittels Rundkneten mit einer Durchmesserreduzierung 26 versehen, mittels welcher das Glührohr 16 mit dem Durchmesser auf die elektrische Isolierschicht 33 am Anschlussbolzen 17 gepresst wird.To produce the radiator seal 30, the electrical insulating layer 33 is first applied to the connecting bolt 17 and / or on the inner wall of the glow tube 16. To form the radiator seal 30, a gas-tight connection between the glow tube 16 and connecting bolt 17 in the region of the sealing portion 23 is produced. The sealing section 23 extends exclusively to the region of the electrical insulating layer 33 so that no electrical short circuit between the connecting pin 17 and the glow tube 16 is formed. For this purpose, the diameter of the glow tube 16 is provided in the sealing portion 23, for example by means of rotary swaging with a diameter reduction 26, by means of which the glow tube 16 is pressed with the diameter of the electrical insulating layer 33 on the connecting bolt 17.

Claims (5)

  1. Glow plug having a metal housing (10) which has a longitudinal bore (12) in which a glow pencil (14) is accommodated, the said glow pencil having a glow tube (16) and a glow coil (18) which is arranged in the glow tube (16), wherein the glow tube (16) makes electrical contact with one end of the glow coil (18) and a connection pin (17) makes electrical contact with the other end of the said glow coil, wherein the connection pin (17) projects into an axial opening (22) in the glow tube (16) and there is connected to the glow tube (16) in an electrically insulating manner by means of a heating element seal (30) in a seal section (23), characterized in that at least one electrical insulation layer (33) is formed on the glow tube (16) and/or on the connection pin (17) at least in the seal section (23), and in that the glow tube (16) is pressed onto the connection pin (17) in the region of the electrical insulation layer (33), so that the heating element seal (30) is formed by the press connection and the electrical insulation layer (33).
  2. Glow plug according to Claim 1, characterized in that the electrical insulation layer (33) is formed on the inner wall of the glow tube (16).
  3. Glow plug according to either of the preceding claims, characterized in that the glow tube (16) has a reduced diameter (26) at least in the region of the seal section (23), the glow tube (16) being pressed with the connection pin (17) by means of the said reduced diameter.
  4. Method for producing the glow plug according to one of the preceding claims, characterized in that at least one electrical insulation layer (33) is applied to the glow tube (16) and/or to the connection pin (17) at least in the seal section (23), and in that the glow tube (16) is pressed onto the connection pin (17) in the region of the electrical insulation layer (33), so that the heating element seal (30) is formed by the press connection and the electrical insulation layer.
  5. Method according to Claim 4, characterized in that the glow tube (16) is given a reduced diameter (26) at least in the region of the seal section (23) by rotary swaging, the glow tube (16) being pressed with the connection pin (17) in the region of the electrical insulation layer (33) by virtue of the said reduced diameter.
EP11776444.9A 2010-12-06 2011-10-31 Glow plug and method for the production thereof Active EP2649375B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062443A DE102010062443A1 (en) 2010-12-06 2010-12-06 Glow plug and method for its production
PCT/EP2011/069086 WO2012076254A1 (en) 2010-12-06 2011-10-31 Glow plug and method for the production thereof

Publications (2)

Publication Number Publication Date
EP2649375A1 EP2649375A1 (en) 2013-10-16
EP2649375B1 true EP2649375B1 (en) 2016-05-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11776444.9A Active EP2649375B1 (en) 2010-12-06 2011-10-31 Glow plug and method for the production thereof

Country Status (4)

Country Link
EP (1) EP2649375B1 (en)
CN (1) CN103228992B (en)
DE (1) DE102010062443A1 (en)
WO (1) WO2012076254A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10670276B2 (en) * 2013-05-02 2020-06-02 Original Pellet Grill Company Llc Double-sealed high-temperature resistant DC ignitor for use with wood pellet burner assemblies
DE102014220235A1 (en) * 2014-10-07 2016-04-07 Robert Bosch Gmbh Radiator for an electrically heated glow plug with axially pressed heating insert, and associated manufacturing method
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
DE102017128885A1 (en) * 2017-12-05 2019-06-06 Schaeffler Technologies AG & Co. KG Electrically insulating rolling bearing

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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
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
CN1137330C (en) * 2000-08-24 2004-02-04 日本特殊陶业株式会社 Preheating plug and spark plug and its producing method
US6900412B2 (en) * 2002-08-12 2005-05-31 Ngk Spark Plug Co., Ltd. Glow plug
WO2005061963A1 (en) * 2003-12-19 2005-07-07 Bosch Corporation Ceramic heater-type glow plug
JP4309757B2 (en) * 2003-12-26 2009-08-05 日本特殊陶業株式会社 Ceramic heater
DE102005029839A1 (en) * 2005-06-27 2007-01-04 Robert Bosch Gmbh glow plug
US20090184101A1 (en) * 2007-12-17 2009-07-23 John Hoffman Sheathed glow plug
US20100059496A1 (en) 2008-09-08 2010-03-11 Federal-Mogul Ignition Company Metal sheath glow plug

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
CN103228992B (en) 2015-11-25
EP2649375A1 (en) 2013-10-16
WO2012076254A1 (en) 2012-06-14
CN103228992A (en) 2013-07-31
DE102010062443A1 (en) 2012-06-06

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