EP1279896A1 - Glow plugs and method of production - Google Patents

Glow plugs and method of production Download PDF

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Publication number
EP1279896A1
EP1279896A1 EP02013624A EP02013624A EP1279896A1 EP 1279896 A1 EP1279896 A1 EP 1279896A1 EP 02013624 A EP02013624 A EP 02013624A EP 02013624 A EP02013624 A EP 02013624A EP 1279896 A1 EP1279896 A1 EP 1279896A1
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EP
European Patent Office
Prior art keywords
glow
plunge
glow tube
heating coil
tube
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
EP02013624A
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German (de)
French (fr)
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EP1279896B1 (en
Inventor
Paul Keller
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.)
BorgWarner Ludwigsburg GmbH
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Beru AG
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Filing date
Publication date
Application filed by Beru AG filed Critical Beru AG
Publication of EP1279896A1 publication Critical patent/EP1279896A1/en
Application granted granted Critical
Publication of EP1279896B1 publication Critical patent/EP1279896B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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
    • F23Q2007/004—Manufacturing or assembling methods

Definitions

  • the invention relates to methods for producing glow plugs and new glow plugs.
  • Glow plugs usually have a glow tube, in which a heating coil is arranged, which is embedded in a ceramic filling.
  • a heating coil is arranged, which is embedded in a ceramic filling.
  • the area is reduced in the so-called feed method, whereby either continuous cylinders or a linear taper to the heating rod tip are achieved.
  • the glow plug is inserted into the rotary hammer tool; for this purpose, the tools have an insertion bevel, the diameter being reduced by the rotary hammering process and the axial advance of the glow tube.
  • the object of the invention is to significantly improve the compression in the glow tube tip while avoiding the disadvantages known from the prior art; At the same time, a new shape of the glow tube tip area is intended to open up further possible uses, in particular the possibility of attaching further components.
  • an essential feature of the invention is to effect the compression or deformation by means of the plunge reduction method;
  • the glow tube is positioned in the tool so that the punches can act radially on the glow tube and compress the glow tube to the desired diameter, with a more uniform compression, since in this compression phase there is no axial feed, so that with only radial action the Tool stamp Material and filament of the glow tube cannot be moved axially.
  • a conventional glow plug has a glow tube 5 with an internal heating coil 4, which is embedded in a ceramic filling 3 and is connected to the glow tube 5 at the combustion chamber end by welding 6; at the opposite end the heating coil 4 is connected to the connection pole 1.
  • the front region 5a of the glow tube 5 on the combustion chamber side is reduced in a cylindrical manner by the known feed method.
  • a possible starting form is a glow rod according to FIG. 2 / 2.1 without additional tapering and without additional compression of the glow rod tip.
  • the glow rod tip can be reduced from the diameter D1 to the diameter D2 in the tip area by the method from the prior art.
  • FIG 4 the deformation of the combustion chamber-side region 5a of the glow tube 5 according to the invention is shown schematically in longitudinal section.
  • this area has a band-shaped constriction 12 directly above the glow tube tip.
  • This area is particularly highly compressed and, due to the proximity of the glow tube wall to the heating coil 4, leads to a band-shaped area 12 of particularly rapid heating when current flows through the heating coil 4.
  • FIG 4.1 also in a schematic longitudinal section, the manufacturing process of the glow plug according to the invention according to Figure 4 is shown; this is where Reduce plunge cut using plunge tool 8; the front surface 11 of the piercing tool 8 acting on the glow tube wall is divided into three flat areas which are angled with respect to one another.
  • the piercing tools 8 of the piercing device not shown, oscillate with a small stroke in the direction X as in the feed method, but without axial feed; A radial feed movement (X (v)) is superimposed on this movement, the diameter of the glow tube area being further reduced with each stroke. In this way, the glow tube area is deformed in accordance with the orientation of the front surface 11 of the piercing tool 8.
  • a fixed stop 9 prevents the material from escaping in the region of the glow tube tip.
  • the tool is chamfered or rounded in the edge areas to allow a certain movement of the material.
  • FIG. 4.2 shows a schematic view of a glow tube tip deformed according to the invention, which is produced with a tool according to FIG. 4.3 and has jaws of different lengths (11, 12, 13), W1 and W2 indicating the angulation of the front surfaces with respect to the direction of insertion.
  • FIG. 5 shows a schematic longitudinal section of the region 5a on the combustion chamber side of a glow tube 5 of another glow plug according to the invention, which has a groove-shaped constriction 12 above the glow tube tip; the plunge reduction method using plunge tools 8 with differently curved front surfaces 11 of different radii R 1 , R 2 and R 3 is shown in FIG. 5.1, reference being made here to the description of FIG. 3.

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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)
  • Spark Plugs (AREA)

Abstract

To produce a heater plug, the sealing of the burning zone (5a) with its heating coil embedded in a ceramic filling is given a reduced cross section at the center with radial expansion at the leading end. The shaping is by pressure pads from both sides, with convex and/or concave curved surfaces pressing against the plug.

Description

Die Erfindung betrifft Verfahren zur Herstellung von Glühkzerzen und neue Glühkerzen.The invention relates to methods for producing glow plugs and new glow plugs.

Glühkerzen weisen üblicherweise ein Glührohr auf, in dem eine Heizwendel angeordnet ist, die in einer Keramikfüllung eingebettet ist. Zur Verbesserung der Verdichtung im brennraumseitigen Bereich des Glührohres, insbesondere in der Glührohrspitze, wird der Bereich im sogenannten Vorschubverfahren reduziert, wobei entweder durchgehende Zylinder oder eine lineare Verjüngung zur Heizstabspitze erzielt werden. Bei diesem Verfahren wird der Glühstab in das Rundhämmerwerkzeug eingeschoben; hierfür weisen die Werkzeuge eine Einführungsschräge auf, wobei durch den Rundhämmervorgang und den axialen Vorschub des Glührohres der Durchmesser reduziert wird.Glow plugs usually have a glow tube, in which a heating coil is arranged, which is embedded in a ceramic filling. To improve the compression in the combustion chamber-side area of the glow tube, in particular in the tip of the glow tube, the area is reduced in the so-called feed method, whereby either continuous cylinders or a linear taper to the heating rod tip are achieved. In this process, the glow plug is inserted into the rotary hammer tool; for this purpose, the tools have an insertion bevel, the diameter being reduced by the rotary hammering process and the axial advance of the glow tube.

Die Reduzierung nach dem Vorschubverfahren führt jedoch gerade im kritischen Bereich direkt hinter der Verschweißung von Heizwendel und Glührohrspitze zu nicht befriedigender Verdichtung. Ebensowenig sind komplexere Formbildungen des brennraumseitigen Glührohrbereichs, die Glühverhalten, Glühverteilung und Lebensdauer der Glühkerze beeinflussen, oder neue Anwendungsmöglichkeiten der Glühkerze erschließen, möglich.However, the reduction using the feed method leads to unsatisfactory compression, especially in the critical area directly behind the welding of the heating coil and glow tube tip. Nor are more complex forms of the Combustion chamber-side glow tube area, which influence the glow behavior, glow distribution and service life of the glow plug, or open up new applications for the glow plug.

Aufgabe der Erfindung ist es, unter Umgehung der aus dem Stand der Technik bekannten Nachteile die Verdichtung in der Glührohrspitze deutlich zu verbessern; gleichzeitig soll eine neue Formgebung des Glührohrspitzenbereichs weitere Anwendungsmöglichkeiten, insbesondere die Möglichkeit der Anbringung weiterer Bauteile, erschließen.The object of the invention is to significantly improve the compression in the glow tube tip while avoiding the disadvantages known from the prior art; At the same time, a new shape of the glow tube tip area is intended to open up further possible uses, in particular the possibility of attaching further components.

Die erfindungsgemäße Aufgabe wird durch die Verfahren gemäß Ansprüchen 1 bis 4 bzw. die Glühkerzen nach Ansprüchen 5 und 6 gelöst. Demnach besteht ein erfindungswesentliches Merkmal darin, die Verdichtung bzw. Verformung mittels des Einstechreduzierverfahren zu bewirken; hierbei wird das Glührohr im Werkzeug positioniert, so daß die Stempel radial auf das Glührohr einwirken können und das Glührohr auf den gewünschten Durchmesser verdichten, wobei eine gleichmäßigere Verdichtung erfolgt, da in dieser Verdichtungsphase ein axialer Vorschub nicht erfolgt, so daß bei nur radialer Einwirkung der Werkzeugstempel Material und Wendel des Glührohrs nicht axial verschoben werden.The object of the invention is achieved by the method according to claims 1 to 4 or the glow plugs according to claims 5 and 6. Accordingly, an essential feature of the invention is to effect the compression or deformation by means of the plunge reduction method; Here, the glow tube is positioned in the tool so that the punches can act radially on the glow tube and compress the glow tube to the desired diameter, with a more uniform compression, since in this compression phase there is no axial feed, so that with only radial action the Tool stamp Material and filament of the glow tube cannot be moved axially.

Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Hierbei zeigen

  • Figur 1 schematisch im Längsschnitt das Glührohr einer Glühkerze aus dem Stand der Technik;
  • Figur 2 und Figur 2.1 sind schematische Wiedergaben eines Glührohrspitzenbereichs ohne zusätzliche Verjüngung bzw. Verdichtung;
  • Figur 3/Figur 3.1 sind schematische Ansichten eines Glühstabes mit zusätzlicher Verjüngung (D1/D2) der Glühstabspitze;
  • Figur 4/Figur 4.1 in schematischem Längsschnitt des brennraumseitigen Bereichs einer erfindungsgemäß verformten bzw. verdichteten Glühkerze mit Werkzeugen für das Einstechkneten;
  • Figur 4.2/4.3 zeigt eine weitere Ausführungsform einer Glühstabspitze mit zusätzlicher Verjüngung durch Einstechkneten mit bereichsweiser unterschiedlichen Längen;
  • Figur 5/5.1 eine andere Ausführungsform einer erfindungsgemäßen zusätzlicher Verjüngung durch Einstechkneten einer Glühstabspitze mit einem Werkzeug mit unterschiedlichen Radien der Frontflächen der Werkzeugbacken.
The invention is explained in more detail with reference to the following figures. Show here
  • Figure 1 shows schematically in longitudinal section the glow tube of a glow plug from the prior art;
  • FIG. 2 and FIG. 2.1 are schematic representations of a glow tube tip region without additional tapering or compression;
  • Figure 3 / Figure 3.1 are schematic views of a glow rod with additional taper (D1 / D2) of the glow rod tip;
  • FIG. 4 / FIG. 4.1 in a schematic longitudinal section of the region on the combustion chamber side of a region deformed according to the invention or compressed glow plug with tools for plunge kneading;
  • FIG. 4.2 / 4.3 shows a further embodiment of a glow rod tip with additional tapering by means of plunge kneading with different lengths in some areas;
  • Figure 5 / 5.1 another embodiment of an additional taper according to the invention by kneading a glow rod tip with a tool with different radii of the front surfaces of the tool jaws.

Nach Figur 1 weist eine übliche Glühkerze ein Glührohr 5 mit innenliegender Heizwendel 4 auf, die in einer Keramikfüllung 3 eingebettet und am brennraumseitigen Ende des Glührohres 5 mit diesem durch Verschweißung 6 verbunden ist; am gegenüberliegenden Ende ist die Heizwendel 4 mit dem Anschlußpol 1 verbunden. Der vordere brennraumseitige Bereich 5a des Glührohres 5 ist nach dem bekannten Vorschubverfahren zylinderförmig reduziert.According to FIG. 1, a conventional glow plug has a glow tube 5 with an internal heating coil 4, which is embedded in a ceramic filling 3 and is connected to the glow tube 5 at the combustion chamber end by welding 6; at the opposite end the heating coil 4 is connected to the connection pole 1. The front region 5a of the glow tube 5 on the combustion chamber side is reduced in a cylindrical manner by the known feed method.

Mögliche Ausgangsform ist ein Glühstab gemäß Figur 2/2.1 ohne zusätliche Verjüngung und ohne zusätzliche Verdichtung der Glühstabspitze.A possible starting form is a glow rod according to FIG. 2 / 2.1 without additional tapering and without additional compression of the glow rod tip.

Gemäß Figur 3/3.1 kann die Glühstabspitze durch das Verfahren aus dem Stand der Technik von dem Durchmesser D1 auf den Durchmesser D2 im Spitzenbereich reduziert werden.According to FIG. 3 / 3.1, the glow rod tip can be reduced from the diameter D1 to the diameter D2 in the tip area by the method from the prior art.

In Figur 4 wird die erfindungsgemäße Verformung des brennraumseitigen Bereiches 5a des Glührohres 5 schematisch im Längsschnitt wiedergegeben. Hierbei weist dieser Bereich unmittelbar oberhalb der Glührohrspitze eine bandförmige Einschnürung 12 auf. Dieser Bereich ist besonders stark verdichtet und führt durch die Nähe der Glührohrwandung zur Heizwendel 4 zu einem bandförmigen Bereich 12 besonders schneller Erwärmung bei Stromfluß durch die Heizwendel 4.In Figure 4, the deformation of the combustion chamber-side region 5a of the glow tube 5 according to the invention is shown schematically in longitudinal section. Here, this area has a band-shaped constriction 12 directly above the glow tube tip. This area is particularly highly compressed and, due to the proximity of the glow tube wall to the heating coil 4, leads to a band-shaped area 12 of particularly rapid heating when current flows through the heating coil 4.

In Figur 4.1 wird, ebenfalls in schematischem Längsschnitt, das Herstellungsverfahren der erfindungsgemäßen Glühkerze gemäß Figur 4 wiedergegeben; hierbei wird das Einstechreduzieren mittels des Einstechwerkzeuges 8 dargestellt; die auf die Glührohrwandung einwirkende Frontfläche 11 des Einstechwerkzeugs 8 ist in drei plane Bereiche aufgeteilt, die zueinander gewinkelt sind. Die Einstechwerkzeuge 8 der nicht abgebildeten Einstechvorrichtung oszillieren mit kleinem Hub in der Richtung X wie bei dem Vorschubverfahren, jedoch ohne axialen Vorschub; dieser Bewegung ist eine radiale Vorschubbewegung (X(v)) überlagert, wobei mit jedem Hub der Durchmesser des Glührohrbereiches weiter verringert wird. Auf diese Weise wird der Glührohrbereich entsprechend der Ausrichtung der Frontfläche 11 des Einstechwerkzeugs 8 verformt. Hierbei verhindert ein Festanschlag 9 ein Ausweichen des Werkstoffes im Bereich der Glührohrspitze. Hierbei ist das Werkzeug in den Randbereichen angeschrägt oder gerundet, um eine gewisse Bewegung des Materials zu ermöglichen. Schließlich kann das reine Einstechverfahren in Kombination mit dem Vorschubverfahren durchgeführt werden, wobei der axiale Vorschub des bearbeiteten Werkstücks in mit Pfeil angedeuteter Richtung erfolgt.In Figure 4.1, also in a schematic longitudinal section, the manufacturing process of the glow plug according to the invention according to Figure 4 is shown; this is where Reduce plunge cut using plunge tool 8; the front surface 11 of the piercing tool 8 acting on the glow tube wall is divided into three flat areas which are angled with respect to one another. The piercing tools 8 of the piercing device, not shown, oscillate with a small stroke in the direction X as in the feed method, but without axial feed; A radial feed movement (X (v)) is superimposed on this movement, the diameter of the glow tube area being further reduced with each stroke. In this way, the glow tube area is deformed in accordance with the orientation of the front surface 11 of the piercing tool 8. Here, a fixed stop 9 prevents the material from escaping in the region of the glow tube tip. The tool is chamfered or rounded in the edge areas to allow a certain movement of the material. Finally, the pure plunge process can be carried out in combination with the feed process, with the machined workpiece being fed axially in the direction indicated by the arrow.

Figur 4.2 zeigt in schematischer Ansicht eine erfindungsgemäß verformte Glührohrspitze auf, die mit einem Werkzeug nach Figur 4.3 hergestellt wird, das Backen unterschiedlicher Länge (11, 12, 13) aufweist, wobei W1 und W2 die Winkelung der Frontflächen bezüglich der Einstechrichtung angeben.FIG. 4.2 shows a schematic view of a glow tube tip deformed according to the invention, which is produced with a tool according to FIG. 4.3 and has jaws of different lengths (11, 12, 13), W1 and W2 indicating the angulation of the front surfaces with respect to the direction of insertion.

Figur 5 zeigt in schematischem Längsschnitt des brennraumseitigen Bereiches 5a eines Glührohres 5 einer anderen erfindungsgemäßen Glühkerze, die oberhalb der Glührohrspitze eine riefenförmige Einschnürung 12 aufweist; das Einstechreduzierungsverfahren mittels Einstechwerkzeugen 8 mit unterschiedlich gewölbten Frontflächen 11 unterschiedlicher Radien R1, R2 und R3 wird in Figur 5.1 dargestellt, wobei hier im übrigen Bezug auf die Beschreibung der Figur 3 genommen wird.FIG. 5 shows a schematic longitudinal section of the region 5a on the combustion chamber side of a glow tube 5 of another glow plug according to the invention, which has a groove-shaped constriction 12 above the glow tube tip; the plunge reduction method using plunge tools 8 with differently curved front surfaces 11 of different radii R 1 , R 2 and R 3 is shown in FIG. 5.1, reference being made here to the description of FIG. 3.

Claims (6)

Verfahren zur Herstellung von Glühkerzen in ansich bekannter Weise, dadurch gekennzeichnet, daß man eine Verdichtung des brennraumseitigen Bereichs (5a) des Glührohres (5) einer an sich bekannten Glühkerze mit innenliegender Heizwendel (4), gegebenenfalls in Verbindung mit Regelwendeln, die in einer Keramikfüllung (3) eingebettet ist (sind), durch Einstechreduzieren mit radialem Vorschub bewirkt.Process for the production of glow plugs in a manner known per se, characterized in that compression of the region (5a) of the glow tube (5) on the combustion chamber side of a glow plug known per se with an internal heating coil (4), optionally in connection with control coils, in a ceramic filling (3) is (are) caused by reduced plunge cut with radial feed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Einstechreduzieren mit Einstechwerkzeugbacken (8/10) durchführt, deren Frontflächen insgesamt unplan sind.Method according to claim 1, characterized in that the plunge reduction is carried out with plunging tool jaws (8/10), the front surfaces of which are overall unplanar. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man das Einstechreduzieren mit Einstechwerkzeugbacken (8/10) durchführt, deren Frontflächen konvex und/oder konkav gewölbt sind.Method according to claim 2, characterized in that the plunge reduction is carried out with plunge tool jaws (8/10) whose front surfaces are convex and / or concave. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man das Einstechreduzieren mit Einstechwerkzeugbacken (8/10) durchführt, deren Frontflächen bereichsweise plan ausgebildet sind, wobei die planen Flächenbereiche gegeneinander gewinkelt angeordnet sind.Method according to claim 2, characterized in that the plunge reduction is carried out with plunge tool jaws (8/10), the front surfaces of which are flat in some areas, the flat surface areas being arranged at an angle to one another. Glühkerze mit einem Glührohr (5) mit innenliegender Heizwendel (4), gegebenenfalls in Verbindung mit Regelwendeln, die in einer Keramikfüllung (3) eingebettet ist (sind), dadurch gekennzeichnet, daß der brennraumseitige Bereich (5a) des Glührohres (5) bandförmige oder riefenförmige Einschnürungen (12) aufweist.Glow plug with a glow tube (5) with an internal heating coil (4), optionally in connection with control coils which are (are) embedded in a ceramic filling (3), characterized in that the combustion chamber-side area (5a) of the glow tube (5) is band-shaped or has groove-shaped constrictions (12). Glühkerze nach Anspruch 5, dadurch gekennzeichnet, daß sie nach einem der Verfahren nach Anspruch 1-4 hergestellt ist.Glow plug according to claim 5, characterized in that it is produced by one of the methods according to claims 1-4.
EP02013624A 2001-07-23 2002-06-19 Glow plugs and method of production Expired - Lifetime EP1279896B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134956A DE10134956A1 (en) 2001-07-23 2001-07-23 Glow plugs and process for their manufacture
DE10134956 2001-07-23

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EP1279896A1 true EP1279896A1 (en) 2003-01-29
EP1279896B1 EP1279896B1 (en) 2005-10-05

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US (1) US6753505B2 (en)
EP (1) EP1279896B1 (en)
JP (1) JP2003042450A (en)
KR (1) KR100765414B1 (en)
AT (1) ATE306053T1 (en)
DE (2) DE10134956A1 (en)
ES (1) ES2245712T3 (en)

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Publication number Priority date Publication date Assignee Title
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

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US7400193B2 (en) 2006-06-29 2008-07-15 Itt Manufacturing Enterprises, Inc. Ultra wide band, differential input/output, high frequency active splitter in an integrated circuit
JP5170894B2 (en) * 2009-01-15 2013-03-27 日本特殊陶業株式会社 Method of manufacturing heater tube for glow plug and glow plug
DE102010027468A1 (en) * 2010-07-17 2012-01-19 Borgwarner Beru Systems Gmbh Glow plug for diesel engine, has glow pin that protrudes from housing, where glow plug comprises sequence of elevations and depressions on surface at outer side of housing, where glow pin comprises thick and thin portions
JP5965179B2 (en) * 2012-03-29 2016-08-03 日本特殊陶業株式会社 Glow plug and manufacturing method thereof

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EP0438097A1 (en) * 1990-01-16 1991-07-24 B 80 S.r.l. Glow plug for diesel engines particularly of motor vehicles, with a tubular sheath having a diameter reduction at the closed end
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Publication number Priority date Publication date Assignee Title
EP0324627A2 (en) * 1988-01-14 1989-07-19 Wellman Automotive Products Ltd Glow plug
EP0438097A1 (en) * 1990-01-16 1991-07-24 B 80 S.r.l. Glow plug for diesel engines particularly of motor vehicles, with a tubular sheath having a diameter reduction at the closed end
JP2000111048A (en) * 1998-10-09 2000-04-18 Ngk Spark Plug Co Ltd Glow plug

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Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 07 29 September 2000 (2000-09-29) *

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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US20030034343A1 (en) 2003-02-20
EP1279896B1 (en) 2005-10-05
ES2245712T3 (en) 2006-01-16
KR100765414B1 (en) 2007-10-11
KR20030011609A (en) 2003-02-11
DE10134956A1 (en) 2003-02-20
JP2003042450A (en) 2003-02-13
DE50204443D1 (en) 2005-11-10
US6753505B2 (en) 2004-06-22
ATE306053T1 (en) 2005-10-15

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