EP0997687A1 - Tubular heating or measuring device - Google Patents

Tubular heating or measuring device Download PDF

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Publication number
EP0997687A1
EP0997687A1 EP99115285A EP99115285A EP0997687A1 EP 0997687 A1 EP0997687 A1 EP 0997687A1 EP 99115285 A EP99115285 A EP 99115285A EP 99115285 A EP99115285 A EP 99115285A EP 0997687 A1 EP0997687 A1 EP 0997687A1
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EP
European Patent Office
Prior art keywords
area
tube
glow plug
glow
bore
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Granted
Application number
EP99115285A
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German (de)
French (fr)
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EP0997687B1 (en
Inventor
Martin Eller
Martin Allgaier
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Publication date
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Publication of EP0997687A1 publication Critical patent/EP0997687A1/en
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Publication of EP0997687B1 publication Critical patent/EP0997687B1/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

Definitions

  • the invention relates to tubular or sleeve-shaped heating and Measuring devices, in particular glow plugs, heating plugs for water preheating, measuring and sensor elements.
  • the object of the present invention is to overcome the disadvantages described, in particular the Slimming down the glow plugs without impairing their function to allow runout deviations of these glow plugs reduce and possibly the construction of an annular gap Make glow plugs redundant. At the same time, the Number of components of such glow plugs can be reduced.
  • the glow plug from the prior art according to FIG. 1 consists of the glow plug body 15, in its front area the glow tube 16 is incorporated in the heating coil 4 and control coil 5 in an electrically insulating, thermally conductive Material such as MgO are embedded.
  • connection side In the area on the connection side there is a connecting conductor in the body 15 10 arranged. This area is opposite sealed the glow tube by a seal 2.
  • the cavity around the connecting conductor 10 is in the connection-side transition area for electrical connection 6 by another Seal 3 sealed; this area of the housing faces a thread 7 and a polygon 8.
  • Exit region of the glow tube 16 from the body 15 is through Enlargement of the diameter of the bore in body 15 Annular gap 14 formed.
  • Figure 2 shows a glow plug according to the invention, the consists in one piece of a tube (1).
  • the pipe (1) is gradually decreasing to pipe sections Diameter reduced.
  • Has in the front glow area 16 the pipe with the smallest diameter and houses the inside Glow element 4, for example in the form of a Incandescent filament.
  • the neighboring one in the connection side direction Pipe section 16a has a larger diameter than that Pipe area 16 on; the transition between the two pipe sections is characterized by a circumferential sealing surface 9a.
  • This sealing surface is provided with a corresponding one Sealing surface in a hole in the engine block to cooperate.
  • the control coil 5 may be arranged.
  • the one in In turn, the connecting pipe region 16b has a slightly larger diameter than the tube area 16a and houses a connecting conductor 10 through a seal 2 at the connection-side pipe end with the electrical Connection 6 connected or designed as such is.
  • Glow element 4 control coil 5 and connecting conductor are preferred 10 in a thermally conductive, electrically not conductive material, such as MgO stored.
  • the candle according to Figure 2 is on her connection-side end with a union nut 17 with an external thread and a cutting ring 19; the cap nut 17 is used for screwing into an internal thread 18 in a bore of the engine block to the candle in the bore to fix.
  • the cutting ring 19 closes under the insertion pressure the union nut 17 the free space between Bore inside wall and outside wall of the pipe 1.
  • the glow plug according to the invention has none Cutting ring on; rather, in an otherwise analogous way to Figure 3, a seal by hitting the sealing surface 9a on the pipe 1 according to FIG. 2 to a corresponding one Mating surface achieved in the bore of the engine block.
  • FIG. 5 shows a glow plug according to the invention, 3 with union nut in one corresponding hole in the engine block 12 can be fixed, wherein the reference symbols have the same meaning as before.
  • the sealing surface 9a of the glow plug cooperates a corresponding counter surface 9b in the bore in the engine block 12 sealing together; because the diameter of the bore areas slightly larger than the corresponding diameter Areas of the tube 1 are around the combustion chamber Area of the tube 1, an air gap 13 is formed; in the same way, an engine block forms an annular gap 14a, of the air gap 13 in the manner described through the sealing surface 9a and the counter surface in the bore is sealed.
  • the embodiment of the glow plug according to the invention, arranged in a corresponding bore in the engine block 12 6 essentially corresponds to FIG. 5 with the Difference that a glow plug is used, the one rolled thread 7 and an embossed polygon 8 according to FIG. 7.

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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)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The glow plug has an integral tube (1) providing a glow plug body and a sleeve enclosing heating and regulating coils (4,5). The tube has a glow plug body section (16) with a reduced diameter enclosing a glow element heating coil (4), a regulating section (16a) of slightly greater diameter, enclosing a regulating coil (5) and a connection section (16b) of greatest diameter enclosing a connection conductor (10).

Description

Die Erfindung betrifft rohr- oder hülsenformige Heiz- und Meßvorrichtungen, insbesondere Glühkerzen, Heizkerzen für Wasservorwärmung, Meß- und Sensorelemente.The invention relates to tubular or sleeve-shaped heating and Measuring devices, in particular glow plugs, heating plugs for water preheating, measuring and sensor elements.

Die Erfindung soll im folgenden zum besseren Verständnis am Beispiel von Stabglühkerzen beschrieben werden.The invention is intended for better understanding in the following are described using the example of glow plugs.

Es ist erwünscht, die erfindungsgemäßen Vorrichtungen, insbesondere auch Glühkerzen, aus Gründen der Minimierung von Materialaufwand, Raumbedarf und Gewicht möglichst schlank zu fertigen. Bei dem Betrieb von Glühkerzen treten jedoch Wärmespannungen auf, die um so mehr zu Beeinträchtigungen der Funktion der Glühkerzen führen, je schlanker und eng-dimensionierter die aus dem Stand der Technik bekannten Glühkerzen gefertigt werden. Bei üblichen, mit Ringspalt gefertigten Glühkerzen tritt im Ringspalt Dampfblasenbildung und Verkokung auf; bei entsprechend konstruierten Sensoren resultieren Fehlermessungen.It is desirable to use the devices of the invention, especially glow plugs, for reasons of minimization of materials, space and weight as possible slim to manufacture. Step when operating glow plugs however, thermal stresses that affect the more so the function of the glow plugs, the slimmer and narrow-dimensioned those known from the prior art Glow plugs are made. In the usual, with an annular gap manufactured glow plugs occurs in the annular gap vapor bubble formation and coking on; with appropriately designed sensors result in error measurements.

Durch die bei Verschlankung kleiner werdenden Durchmesser bei gleichzeitig häufiger Forderung nach längerer Dimensionierung von Stabglühkerzen ergeben sich bei den geforderten Toleranzen und der Notwendigkeit wirtschaftlicher Fertigung erhebliche technische Probleme, wie beispielsweise die Einhaltung der Rundlauftoleranzen, Schwierigkeiten bezüglich der Abdichtung zwischen Glühkerzenkörper und Glührohr sowie Raumprobleme im Regelwendelbereich bei Stabglühkerzen.Due to the smaller and smaller diameters with frequent demands for longer Dimensioning of glow plugs results in the required tolerances and the need for economic Manufacturing significant technical problems, such as compliance with concentricity tolerances, difficulties regarding the seal between the glow plug body and glow tube as well as space problems in the control coil area Glow plugs.

Die Aufgabe der vorliegenden Erfindung besteht darin, die geschilderten Nachteile zu überwinden, insbesondere die Verschlankung der Glühkerzen ohne Funktionsbeeinträchtigung zu ermöglichen, Rundlaufabweichungen dieser Glühkerzen zu vermindern und ggf. die Konstruktion eines Ringspalts bei Stabglühkerzen überflüssig zu machen. Gleichzeitig soll die Anzahl der Bauteile solcher Glühkerzen verringert werden.The object of the present invention is to overcome the disadvantages described, in particular the Slimming down the glow plugs without impairing their function to allow runout deviations of these glow plugs reduce and possibly the construction of an annular gap Make glow plugs redundant. At the same time, the Number of components of such glow plugs can be reduced.

Die erfindungsgemäße Aufgabe wird durch die Glühkerzen gemäß Anspruch 1 gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den nachfolgenden Ansprüchen 2 bis 9.The object of the invention is achieved by the glow plugs solved according to claim 1. Further advantageous configurations the invention result from the following claims 2 to 9.

Die Erfindung wird anhand der folgenden Figuren 1 bis 7 näher erläutert.

  • Figur 1 ist ein schematischer teilweiser Querschnitt durch eine Glühkerze aus dem Stand der Technik;
  • Figur 2 ist ein schematischer teilweiser Querschnitt durch eine Ausführungsform der erfindungsgemäßen Glühkerze;
  • Figur 3 zeigt im schematischen teilweisen Querschnitt den anschlußseitigen Bereich einer erfindungsgemäßen Glühkerze mit Überwurfmutter.
  • Figur 4 gibt eine andere Ausführungsform der erfindungsgemäßen Glühkerze mit Überwurfmutter wieder.
  • Figur 5 ist die schematische Darstellung einer erfindungsgemäßen Glühkerze mit Überwurfmutter und Schneidring im Motorblock.
  • Figur 6 zeigt eine andere erfindungsgemäße Stabglühkerze im Motorblock.
  • Figur 7 zeigt den anschlußseitigen Bereich einer erfindungsgemäßen Stabglühkerze mit aufgerolltem Gewinde und angeprägtem Vielkant.
    • The invention is explained in more detail with reference to the following FIGS. 1 to 7.
  • Figure 1 is a schematic partial cross section through a prior art glow plug;
  • Figure 2 is a schematic partial cross section through an embodiment of the glow plug according to the invention;
  • Figure 3 shows a schematic partial cross section of the connection-side area of a glow plug according to the invention with a union nut.
  • Figure 4 shows another embodiment of the glow plug according to the invention with a union nut.
  • Figure 5 is a schematic representation of a glow plug according to the invention with a union nut and cutting ring in the engine block.
  • Figure 6 shows another glow plug according to the invention in the engine block.
  • Figure 7 shows the connection-side area of a glow plug according to the invention with rolled thread and stamped polygon.

    • Die Glühkerze aus dem Stand der Technik gemäß Figur 1 besteht aus dem Glühkerzenkörper 15, in dessen vorderen Bereich das Glührohr 16 eingearbeitet ist, in dem Heizwendel 4 und Regelwendel 5 in einem elektrisch isolierenden, wärmeleitfähigen Material wie MgO eingebettet sind.The glow plug from the prior art according to FIG. 1 consists of the glow plug body 15, in its front area the glow tube 16 is incorporated in the heating coil 4 and control coil 5 in an electrically insulating, thermally conductive Material such as MgO are embedded.

    Im anschlußseitigen Bereich ist im Körper 15 ein Verbindungsleiter 10 angeordnet. Dieser Bereich ist gegenüber dem Glührohr durch eine Dichtung 2 abgedichtet. Der Hohlraum um den Verbindungsleiter 10 ist im anschlußseitigen Übergangsbereich zum elektrischen Anschluß 6 durch eine weitere Dichtung 3 abgedichtet; dieser Bereich des Gehäuses weist ein Gewinde 7 und einen Vielkant 8 auf. Im brennraumseitigen Austrittbereich des Glührohrs 16 aus dem Körper 15 ist durch Vergrößerung des Durchmessers der Bohrung in Körper 15 ein Ringspalt 14 ausgebildet.In the area on the connection side there is a connecting conductor in the body 15 10 arranged. This area is opposite sealed the glow tube by a seal 2. The cavity around the connecting conductor 10 is in the connection-side transition area for electrical connection 6 by another Seal 3 sealed; this area of the housing faces a thread 7 and a polygon 8. In the combustion chamber side Exit region of the glow tube 16 from the body 15 is through Enlargement of the diameter of the bore in body 15 Annular gap 14 formed.

    Figur 2 zeigt eine erfindungsgemäße Glühkerze, die einstückig aus einem Rohr (1) besteht.Figure 2 shows a glow plug according to the invention, the consists in one piece of a tube (1).

    Das Rohr (1) ist stufenweise zu Rohrabschnitten abnehmender Durchmesser reduziert. Im vorderen Glühbereich 16 hat das Rohr den geringsten Durchmesser und beherbergt das innenliegende Glühelement 4, beispielsweise in Form einer Glühwendel. Der in anschlußseitiger Richtung benachbarte Rohrabschnitt 16a weist einen größeren Durchmesser als der Rohrbereich 16 auf; der Übergang zwischen den beiden Rohrbereichen ist durch eine umlaufende Dichtfläche 9a gekennzeichnet. Diese Dichtfläche ist vorgesehen, mit einer entsprechenden Dichtfläche in einer Bohrung im Motorblock abdichtend zusammenzuwirken. In diesem Bereich 16a kann beispielsweise die Regelwendel 5 angeordnet sein. Der sich in Anschlußrichtung anschließende Rohrbereich 16b hat wiederum einen etwas größeren Durchmesser als der Rohrbereich 16a und beherbergt einen Verbindungsleiter 10, der durch eine Dichtung 2 am anschlußseitigen Rohrende hindurch mit dem elektrischen Anschluß 6 verbunden oder als ein solcher ausgebildet ist.The pipe (1) is gradually decreasing to pipe sections Diameter reduced. Has in the front glow area 16 the pipe with the smallest diameter and houses the inside Glow element 4, for example in the form of a Incandescent filament. The neighboring one in the connection side direction Pipe section 16a has a larger diameter than that Pipe area 16 on; the transition between the two pipe sections is characterized by a circumferential sealing surface 9a. This sealing surface is provided with a corresponding one Sealing surface in a hole in the engine block to cooperate. In this area 16a, for example the control coil 5 may be arranged. The one in In turn, the connecting pipe region 16b has a slightly larger diameter than the tube area 16a and houses a connecting conductor 10 through a seal 2 at the connection-side pipe end with the electrical Connection 6 connected or designed as such is.

    Bevorzugt sind Glühelement 4, Regelwendel 5 und Verbindungsleiter 10 in einem wärmeleitenden, elektrisch nicht leitenden Material, wie beispielsweise MgO gelagert.Glow element 4, control coil 5 and connecting conductor are preferred 10 in a thermally conductive, electrically not conductive material, such as MgO stored.

    Gemäß Figur 3 ist die Kerze gemäß Figur 2 auf ihrem anschlußseitigen Ende mit einer Überwurfmutter 17 mit Außengewinde sowie einem Schneidring 19 versehen; die Überwurfmutter 17 dient zum Eindrehen in ein Innengewinde 18 in einer Bohrung des Motorblocks, um die Kerze in der Bohrung zu fixieren. Der Schneidring 19 verschließt unter dem Eindrehdruck der Überwurfmutter 17 den freien Raum zwischen Bohrung Innenwand und Außenwand des Rohres 1.According to Figure 3, the candle according to Figure 2 is on her connection-side end with a union nut 17 with an external thread and a cutting ring 19; the cap nut 17 is used for screwing into an internal thread 18 in a bore of the engine block to the candle in the bore to fix. The cutting ring 19 closes under the insertion pressure the union nut 17 the free space between Bore inside wall and outside wall of the pipe 1.

    In Figur 4 weist die erfindungsgemäße Glühkerze keinen Schneidring auf; vielmehr wird, in im übrigen analoger Weise zu Figur 3, eine Abdichtung durch das Auftreffen der Dichtfläche 9a am Rohr 1 gemäß Figur 2 auf eine entsprechende Gegenfläche in der Bohrung des Motorblocks erzielt.In Figure 4, the glow plug according to the invention has none Cutting ring on; rather, in an otherwise analogous way to Figure 3, a seal by hitting the sealing surface 9a on the pipe 1 according to FIG. 2 to a corresponding one Mating surface achieved in the bore of the engine block.

    In Figur 5 wird eine erfindungsgemäße Glühkerze wiedergegeben, die gemäß Figur 3 mit Überwurfmutter in einer entsprechenden Bohrung im Motorblock 12 fixierbar ist, wobei die Bezugszeichen die gleiche Bedeutung wie zuvor besitzen.5 shows a glow plug according to the invention, 3 with union nut in one corresponding hole in the engine block 12 can be fixed, wherein the reference symbols have the same meaning as before.

    Hierbei wirkt die Dichtfläche 9a der Glühkerze mit einer entsprechenden Gegenfläche 9b in der Bohrung im Motorblock 12 abdichtend zusammen; da die Durchmesser der Bohrungsbereiche etwas größer als die Durchmesser der entsprechenden Bereiche des Rohres 1 sind, wird um den brennraumseitigen Bereich des Rohres 1 ein Luftspalt 13 gebildet; im Motorblock wird auf gleicher Weise ein Ringspalt 14a gebildet, der gegenüber dem Luftspalt 13 in beschriebener Weise durch die Dichtfläche 9a und die Gegenfläche in der Bohrung abgedicht ist.Here, the sealing surface 9a of the glow plug cooperates a corresponding counter surface 9b in the bore in the engine block 12 sealing together; because the diameter of the bore areas slightly larger than the corresponding diameter Areas of the tube 1 are around the combustion chamber Area of the tube 1, an air gap 13 is formed; in the In the same way, an engine block forms an annular gap 14a, of the air gap 13 in the manner described through the sealing surface 9a and the counter surface in the bore is sealed.

    Die Ausführungsform der erfindungsgemäßen Glühkerze, angeordnet in einer entsprechenden Bohrung im Motorblock 12 gemäß Figur 6 entspricht im wesentlichen der Figur 5 mit dem Unterschied, daß eine Glühkerze verwendet wird, die ein aufgerolltes Gewinde 7 und einen angeprägten Vielkant 8 gemäß Figur 7 aufweist.The embodiment of the glow plug according to the invention, arranged in a corresponding bore in the engine block 12 6 essentially corresponds to FIG. 5 with the Difference that a glow plug is used, the one rolled thread 7 and an embossed polygon 8 according to FIG. 7.

    Claims (9)

    Glühkerze mit einem Glühkerzenkörper und einem Rohr, in dem Heiz- und Regelwendeln angeordnet sind, dadurch gekennzeichnet, daß Glühkerzenkörper und Rohr einstückig als Rohr (1) ausgebildet sind, wobei Rohr (1) Bereiche mit unterschiedlichen Durchmessern wie den Glühbereich (16) mit innenliegendem Glühelement (4), den Regelbereich (16a) mit innenliegendem Regelelement(en) (5) bzw. den Verbindungsbereich (16b) mit innenliegendem Verbindungsleiter (10) zur Verbindung mit dem elektrischen Anschluß (6) aufweist.Glow plug with one glow plug body and one Pipe in which heating and control coils are arranged, thereby characterized in that the glow plug body and tube in one piece Tube (1) are formed, with tube (1) areas with different Diameters like the annealing area (16) with internal glow element (4), the control range (16a) with internal control element (s) (5) or the connection area (16b) with internal connecting conductor (10) for Has connection with the electrical connection (6). Glühkerze nach Anspruch 1, dadurch gekennzeichnet, daß der Übergang des Glührohrbereichs (16) zum sich anschließenden Rohrbereich (16a) größeren Durchmessers als Dichtfläche (9a) ausgebildet ist.Glow plug according to claim 1, characterized in that the transition of the glow tube area (16) to the subsequent Pipe area (16a) of larger diameter than Sealing surface (9a) is formed. Glühkerze nach Anspruch 1 und/oder Anspruch 2, dadurch gekennzeichnet, daß der Innenraum des Rohres (1) im anschlußseitigen Endbereich mit einer Dichtung (2), durch die der Verbindungsleiter (10) nach außen bzw. der elektrische Anschluß (6) in das Rohr (1) führt, verschlossen ist.Glow plug according to claim 1 and / or claim 2, characterized in that the interior of the tube (1) in connection-side end area with a seal (2), through the connecting conductor (10) to the outside or the electrical one Connection (6) leads into the tube (1), is closed. Glühkerze nach Anspruch 3, dadurch gekennzeichnet, daß das Rohr (1) vollständig mit wärmeleitendem, elektrisch nicht leitendem Material gefüllt ist, in dem Heiz- und Regelwendeln (4,5) und Verbindungsleiter (10) eingebettet sind.Glow plug according to claim 3, characterized in that the tube (1) completely with heat-conducting, electrical non-conductive material is filled in the heating and control coils (4,5) and connecting conductor (10) embedded are. Glühkerze nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rohr (1) im anschlußseitigen Endbereich mit einem Gewinde (7) und mit angeprägtem Vielkant (8) versehen ist. Glow plug according to at least one of the previous ones Claims, characterized in that the tube (1) in the connection side End area with a thread (7) and with embossed polygon (8) is provided. Glühkerze nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie zum Einbau in eine Gewindebohrung anschlußseitig mit einer Überwurfmutter (21) versehen ist.Glow plug according to one of claims 1 to 4, characterized characterized in that they can be installed in a threaded hole Provide a union nut (21) on the connection side is. Glühkerze nach Anspruch 6, dadurch gekennzeichnet, daß sie zusätzlich einen Schneidring (19) aufweist.Glow plug according to claim 6, characterized in that it additionally has a cutting ring (19). Glühkerze nach mindestens einem der vorhergehenden Ansprüche in Kombination mit einem Motorblock, der eine Bohrung aufweist, die in ihrem brennraumseitigen Bereich unter Ausbildung eines Luftspalts (13) zwischen Außenfläche des Glührohrs (16) und Innenfläche des umgebenden Bereichs der Bohrung einen etwas größeren Durchmesser als der Glührohrbereich (16) der Glühkerze aufweist; mit einer Dichtfläche zum abdichtenden Zusammenwirken mit der Dichtfläche (9a) des Rohres (1) beim Übergang der Bohrung des Bereichs zur Aufnahme des Glührohrbereichs (16) in den Bohrungsbereich zur Aufnahme des Rohrbereichs (16a), wobei der Durchmesser dieses Bohrungsbereichs etwas größer als der Durchmesser des Rohrbereichs (16a) unter Ausbildung eines Ringspalts (14a) im Motorblock (12) ist; wobei im Eingangsbereich der Bohrung zum Zusammenwirken mit der Überwurfmutter (17) ggf. im Zusammenwirken mit Schneidring (19) ein Gewinde (18) angeordnet ist, so daß durch Anziehen der Überwurfmutter (17) die Dichtfläche (9a) am Rohr auf die entsprechende Dichtfläche in der Bohrung abdichtend gepreßt wird, und wobei bei Verwendung des Schneidrings (19) dieser den Ringspalt (14a) abdichtet.Glow plug according to at least one of the previous ones Claims in combination with an engine block, the one Has bore in their combustion chamber area forming an air gap (13) between the outer surface of the glow tube (16) and inner surface of the surrounding area the bore has a slightly larger diameter than the glow tube area (16) the glow plug; with a sealing surface for sealing interaction with the sealing surface (9a) of the tube (1) at the transition of the bore of the area for receiving the glow tube area (16) in the bore area for receiving the tube area (16a), the diameter this bore area is slightly larger than the diameter of the tube area (16a) with the formation of an annular gap (14a) is in the engine block (12); being in the entrance area the hole for interaction with the union nut (17) a thread, possibly in cooperation with the cutting ring (19) (18) is arranged so that by tightening the union nut (17) the sealing surface (9a) on the pipe to the corresponding Sealing surface in the bore is pressed sealingly, and wherein when using the cutting ring (19) this the annular gap (14a) seals. Glühkerze nach Anspruch 8, dadurch gekennzeichnet, daß anstelle der Glühkerze mit Überwurfmutter die Glühkerze mit aufgerolltem Gewinde (7) und angeprägtem Vielkant (8) verwendet wird.Glow plug according to claim 8, characterized in that instead of the glow plug with union nut, the glow plug with rolled thread (7) and embossed polygon (8) is used.
    EP99115285A 1998-10-23 1999-08-02 Tubular heating or measuring device Expired - Lifetime EP0997687B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19849120A DE19849120C2 (en) 1998-10-23 1998-10-23 Glow plug
    DE19849120 1998-10-23

    Publications (2)

    Publication Number Publication Date
    EP0997687A1 true EP0997687A1 (en) 2000-05-03
    EP0997687B1 EP0997687B1 (en) 2004-03-17

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    US (1) US6314930B1 (en)
    EP (1) EP0997687B1 (en)
    JP (1) JP3844415B2 (en)
    AT (1) ATE262144T1 (en)
    DE (2) DE19849120C2 (en)
    ES (1) ES2213953T3 (en)

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    DE102007044967A1 (en) * 2007-09-19 2009-04-02 Beru Ag Glow plug with coking-optimized design, special annular gap formation

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    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1283394A2 (en) * 2001-08-10 2003-02-12 Ngk Spark Plug Co., Ltd. Heater
    EP1283394A3 (en) * 2001-08-10 2006-06-28 Ngk Spark Plug Co., Ltd. Heater

    Also Published As

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    DE19849120C2 (en) 2000-09-28
    ES2213953T3 (en) 2004-09-01
    DE19849120A1 (en) 2000-06-29
    EP0997687B1 (en) 2004-03-17
    JP2000130753A (en) 2000-05-12
    ATE262144T1 (en) 2004-04-15
    JP3844415B2 (en) 2006-11-15
    DE59908861D1 (en) 2004-04-22
    US6314930B1 (en) 2001-11-13

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