EP0937945A1 - Sheathed-element glow plug - Google Patents

Sheathed-element glow plug Download PDF

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Publication number
EP0937945A1
EP0937945A1 EP99100628A EP99100628A EP0937945A1 EP 0937945 A1 EP0937945 A1 EP 0937945A1 EP 99100628 A EP99100628 A EP 99100628A EP 99100628 A EP99100628 A EP 99100628A EP 0937945 A1 EP0937945 A1 EP 0937945A1
Authority
EP
European Patent Office
Prior art keywords
glow plug
plug according
candle housing
connection
candle
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
EP99100628A
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German (de)
French (fr)
Other versions
EP0937945B1 (en
Inventor
Johannes Locher
Werner Teschner
Steffen Schott
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 EP0937945A1 publication Critical patent/EP0937945A1/en
Application granted granted Critical
Publication of EP0937945B1 publication Critical patent/EP0937945B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 Arrangement in the combustion chamber of air-compressing internal combustion engines according to the genus of the main claim.
  • glow plugs meet in the upper area between the connecting pin and glow plug essentially the three components round plug (round nut), insulating washer and double seal different functions.
  • round connector forms by force and / or form-fitting Connection the connecting element between the Connection pin of the glow plug and the plug of the engine side harness.
  • the metallic and therefore conductive material of the circular connector also serves the contacting and power supply between the wiring harness and the connecting bolt.
  • the insulating washer made of temperature-resistant and electrical Non-conductive material is used for electrical insulation between candle housing and round plug.
  • the so-called Double seal is used in addition to the electrical insulation between the candle housing and the round plug as well as the centering the connecting bolt in the candle housing mainly the Sealing the inside of the candle case against the Surroundings.
  • the double seal is both by a Sealing surface to the inside of the candle housing as well Characterized sealing surface to the connecting bolt. Out of it to recognize that there are three different components different material are necessary.
  • the glow plug according to the invention with the characteristic has the advantage that for the above functions and requirements only a single component - the so-called insulating sleeve - is required becomes.
  • This component can be made of electrically insulating Material or electrically conductive material with electrically insulating coating exist.
  • this component can have both the sealing function compared to the candle housing and the connecting bolt as well the centering function of the connecting bolt compared to the Ensure candle housing.
  • the electrical contact between the connector of the engine side wiring harness and the Glow plugs can be plugged in directly the end protruding from the sleeve-shaped insulating sleeve of the metallic connecting bolt.
  • the Plug can be in addition to the described friction of the plug contact by an appropriately designed Positive locking element fixed to the outer jacket of the insulating sleeve become.
  • FIG Glow plug in Figure 2 on an enlarged scale Individual part according to the invention in half-longitudinal section.
  • the glow plug 10 consists in a known manner of a tubular candle housing 11 made of metallic and therefore electrically conductive material.
  • a connection pin 12 In the longitudinal bore 11A of the candle housing 11 is a connection pin 12 with the same axis used.
  • the connecting bolt protrudes from the candle housing with its upper end and serves to contact the motor-side connector and the Power supply.
  • the tubular element 15 is so on Connection bolts 12 inserted into the candle housing 11 that both a contact surface between the tubular element and the Connection bolts as well as a contact surface between the Pipe element 15 and the inner contour of the longitudinal bore 11A of the Candle housing is formed.
  • the contact area can by pressing with subsequent axial fixation of the Inner and / or outer edge of the tubular element in the area of into the inside of the candle housing facing towards you Cone on the inner bore of the candle housing and / or the Connection bolt are generated.
  • a circumferential bead 23 of any geometry formed which as a positive locking element for the plug of the engine side cable harness.
  • the pipe element according to Embodiment Figure 1 or Figure 2 points as Joint connection to the connecting bolt 12 has an internal thread 16 on. This goes in the inside of the candle housing End of the tubular element in a bore with a Inside diameter greater than that of the Thread diameter.
  • the seal after this the exemplary embodiment takes place via the inner and outer sealing surface (sealing surface) 18, 19 of the ins Candle housing inside directed end of the raw element.
  • the tubular element according to embodiment 2 has two cylindrical surfaces on the inside and outside diameter, either directly through press fits or indirectly through Joining aids of the above methods as Joint connection with sealing function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

The glow pin plug has a tubular metal housing (11) with a glow pin (13) sealed in its longitudinal bore (11A) with a part of its length sealed and a connection bolt (12) which delivers current. The connection bolt is connected to the housing in sealed manner via a one-piece tube (15) with two sealing surfaces (18,19) on its housing end and a shape locking rib (23) on its outer surface.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Glühstiftkerze zur Anordnung im Brennraum luftverdichtender Brennkraftmaschinen nach der Gattung des Hauptanspruchs. Bei derartigen bekannten Glühstiftkerzen erfüllen im oberen Bereich zwischen Anschlußbolzen und Glühstiftkerze im wesentlichen die drei Bauteile Rundstecker (Rundmutter), Isolierscheibe und Doppeldichtung unterschiedliche Funktionen. Der Rundstecker bildet durch Kraft und/oder formschlüssige Verbindung das Verbindungselement zwischen dem Anschlußbolzen der Glühstiftkerze und dem Stecker des motorseitigen Kabelbaums. Der metallische und dadurch leitfähige Werkstoff des Rundsteckers dient darüberhinaus der Kontaktierung und Stromzuführung zwischen dem Kabelbaum und dem Anschlußbolzen.The invention relates to a glow plug Arrangement in the combustion chamber of air-compressing internal combustion engines according to the genus of the main claim. With such known glow plugs meet in the upper area between the connecting pin and glow plug essentially the three components round plug (round nut), insulating washer and double seal different functions. Of the Round connector forms by force and / or form-fitting Connection the connecting element between the Connection pin of the glow plug and the plug of the engine side harness. The metallic and therefore conductive material of the circular connector also serves the contacting and power supply between the wiring harness and the connecting bolt.

Die Isolierscheibe aus temperaturbeständigem und elektrisch nicht leitendem Werkstoff dient der elektrischen Isolation zwischen Kerzengehäuse und Rundstecker. Die sogenannte Doppeldichtung dient neben der elektrischen Isolation zwischen Kerzengehäuse und Rundstecker sowie der Zentrierung des Anschlußbolzens im Kerzengehäuse hauptsächlich der Andichtung des Inneren des Kerzengehäuses gegenüber der Umgebung. Die Doppeldichtung ist sowohl durch eine Dichtfläche zum Inneren des Kerzengehäuses als auch einer Dichtfläche zum Anschlußbolzen charakterisiert. Daraus ist zu erkennen, daß hierfür drei verschiedene Bauteile unterschiedlichen Werkstoffs notwendig sind.The insulating washer made of temperature-resistant and electrical Non-conductive material is used for electrical insulation between candle housing and round plug. The so-called Double seal is used in addition to the electrical insulation between the candle housing and the round plug as well as the centering the connecting bolt in the candle housing mainly the Sealing the inside of the candle case against the Surroundings. The double seal is both by a Sealing surface to the inside of the candle housing as well Characterized sealing surface to the connecting bolt. Out of it to recognize that there are three different components different material are necessary.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Glühstiftkerze mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß für die obengenannten Funktionen und Anforderungen nur ein einziges Bauteil -die sogenannte Isolierhülse- benötigt wird. Dieses Bauteil kann aus elektrisch isolierendem Werkstoff oder elektrisch leitfähigem Werkstoff mit elektrisch isolierender Beschichtung bestehen.The glow plug according to the invention with the characteristic In contrast, features of the main claim have the advantage that for the above functions and requirements only a single component - the so-called insulating sleeve - is required becomes. This component can be made of electrically insulating Material or electrically conductive material with electrically insulating coating exist.

Weiterhin kann dieses Bauteil sowohl die Dichtfunktion gegenüber dem Kerzengehäuse und dem Anschlußbolzen als auch die Zentrierfunktion des Anschlußbolzens gegenüber dem Kerzengehäuse gewährleisten. Der elektrische Kontakt zwischen dem Stecker des motorseitigen Kabelbaums und der Glühstiftkerze kann durch einen direkten Steckkontakt mit dem aus der hülsenförmigen Isolierhülse herausragenden Ende des metallischen Anschlußbolzens verwirktlicht werden. Der Stecker kann dabei zusätzlich zum beschriebenen Reibschluß des Steckkontakts durch ein entsprechend gestaltetes Formschlußelement am Außenmantel der Isolierhülse fixiert werden.Furthermore, this component can have both the sealing function compared to the candle housing and the connecting bolt as well the centering function of the connecting bolt compared to the Ensure candle housing. The electrical contact between the connector of the engine side wiring harness and the Glow plugs can be plugged in directly the end protruding from the sleeve-shaped insulating sleeve of the metallic connecting bolt. Of the Plug can be in addition to the described friction of the plug contact by an appropriately designed Positive locking element fixed to the outer jacket of the insulating sleeve become.

Die Reduzierung der Teilevielfalt von bislang drei auf ein einziges Bauteil ermöglicht eine einfachere und kostengünstigere Montage durch Reduzierung der Anzahl der Montageoperationen und Prüfschritte. Der Ersatz der bislang drei Bauteile, Rundstecker (Rundmutter), Isolierscheibe und Doppeldichtung durch ein einziges Bauteil ermöglicht, außerdem eine deutiche Reduzierung der Stoffkosten.Reducing the number of parts from three to one single component enables a simpler and less expensive assembly by reducing the number of Assembly operations and test steps. The replacement of the so far three components, round plug (round nut), insulating washer and Double seal made possible by a single component, also a significant reduction in material costs.

Zeichnungdrawing

Die Zeichnung zeigt in Figur 1 einen Teillängsschnitt einer Glühstiftkerze, in Figur 2 in vergrößertem Maßstab das erfindungsgemäße Einzelteil im Halb-Längsschnitt.The drawing shows a partial longitudinal section in FIG Glow plug, in Figure 2 on an enlarged scale Individual part according to the invention in half-longitudinal section.

Die Glühstiftkerze 10 besteht in bekannter Weise aus einem rohrförmigen Kerzengehäuse 11 aus metallischem und damit elektrisch leitfähigen Werkstoff. In der Längsbohrung 11A des Kerzengehäuses 11 ist achsgleich ein Anschlußbolzen 12 eingesetzt. Außerdem befindet sich im Kerzengehäuse 11 ein in der Regel eingepreßter Glühstift 13. Der Anschlußbolzen ragt mit seinem oberen Ende aus dem Kerzengehäuse heraus und dient der Kontaktierung des motorseitigen Steckers sowie der Stromzuführung.The glow plug 10 consists in a known manner of a tubular candle housing 11 made of metallic and therefore electrically conductive material. In the longitudinal bore 11A of the candle housing 11 is a connection pin 12 with the same axis used. There is also a candle housing 11 usually pressed in glow plug 13. The connecting bolt protrudes from the candle housing with its upper end and serves to contact the motor-side connector and the Power supply.

Das erfindungsgemäße Rohrelement 15 wird derart über den Anschlußbolzen 12 in das Kerzengehäuse 11 eingeführt, daß sowohl eine Kontaktfläche zwischen dem Rohrelement und dem Anschlußbolzen als auch eine Kontaktfläche zwischen dem Rohrelement 15 und der Innenkontur der Längsbohrung 11A des Kerzengehäuses ausgebildet wird. Die Kontaktfläche kann durch Anpressen mit anschließender axialer Fixierung der Innen- und/oder Außenkante des Rohrelements im Bereich der in das Kerzengehäuseinnere weisenden Stirnfläche gegen einen Konus an der Innenbohrung des Kerzengehäuses und/oder des Anschlußbolzens erzeugt werden.The tubular element 15 according to the invention is so on Connection bolts 12 inserted into the candle housing 11 that both a contact surface between the tubular element and the Connection bolts as well as a contact surface between the Pipe element 15 and the inner contour of the longitudinal bore 11A of the Candle housing is formed. The contact area can by pressing with subsequent axial fixation of the Inner and / or outer edge of the tubular element in the area of into the inside of the candle housing facing towards you Cone on the inner bore of the candle housing and / or the Connection bolt are generated.

Diese Kontaktflächen an der inneren und äußeren Manteloberfläche des Rohrelements 15 dienen der Zentrierung des oberen Bereichs des Anschlußbolzens bezüglich der Längsbohrung 11A sowie der Abdichtung des Inneren des Kerzengehäuses gegenüber der Umgebung. Hierzu wird auf Figur 2 verwiesen, in welcher unten am Rohrelement eine äußere Dichtfläche 18 und eine innere Dichtfläche 19 zu erkennen sind. Die Abdichtung erfolgt hier also direkt durch das Rohrelement, kann aber durch ein, je nach Art des eingesetzten Fügeverfahrens, verwendetes Fügehilfsmittel, wie z.B. Klebstoff erfolgen. Die Figur 2 zeigt in vergrößertem Maßstab das Rohrelement 15 nach dem Ausführungsbeispiel der Figur 1. Dieses Bauteil kann aus elektrisch isolierendem Werkstoff oder elektrisch leitfähigem Werkstoff mit elektrisch isolierender Beschichtung hergestellt sein. Am Außenumfang des aus dem Kerzengehäuse 11 herausragenden Bereichs des Rohrelements 15 ist ein umlaufender Wulst 23 beliebiger Geometrie ausgebildet, welcher als Formschlußelement für den Stecker des motorseitigen Kabelbaums dient. Das Rohrelement gemäß Ausführungsbeispiel Figur 1 bzw. Figur 2 weist als Fügeverbindung zum Anschlußbolzen 12 ein Innengewinde 16 auf. Dieses geht in dem ins Kerzengehäuseinnere gerichteten Ende des Rohrelements in eine Bohrung mit einem Innendurchmesser über, der größer als der des Gewindedurchmessers ist. Die Abdichtung nach diesem Ausführungsbeispiel erfolgt -wie bereits erwähnt- über die innere und äußere Dichtfläche (Dichtfläche) 18, 19 des ins Kerzengehäuseinnere gerichteten Endes des Rohelements.These contact surfaces on the inner and outer Shell surface of the tubular element 15 are used for centering the upper area of the connecting bolt with respect to the Longitudinal bore 11A and the seal of the interior of the Candle case against the environment. For this, see Figure 2 referenced, in which an outer at the bottom of the tubular element Sealing surface 18 and an inner sealing surface 19 can be seen are. The sealing is done directly by the Pipe element, but can, depending on the type of joining method used, joining aid used, such as. Glue. Figure 2 shows in on an enlarged scale, the tubular element 15 after Embodiment of Figure 1. This component can be made electrically insulating material or electrical conductive material with electrically insulating Coating be made. On the outer circumference of the from the Candle housing 11 protruding area of the tubular element 15th is a circumferential bead 23 of any geometry formed which as a positive locking element for the plug of the engine side cable harness. The pipe element according to Embodiment Figure 1 or Figure 2 points as Joint connection to the connecting bolt 12 has an internal thread 16 on. This goes in the inside of the candle housing End of the tubular element in a bore with a Inside diameter greater than that of the Thread diameter. The seal after this As already mentioned, the exemplary embodiment takes place via the inner and outer sealing surface (sealing surface) 18, 19 of the ins Candle housing inside directed end of the raw element.

Das Rohrelement gemäß Ausführungsbeispiel 2 weist zwei zylinderförmige Flächen am Innen- und Außendurchmesser auf, die entweder direkt durch Preßpassungen oder indirekt durch Fügehilfsmittel der oben genannten Verfahren als Fügeverbindung mit Dichtfunktion wirken.The tubular element according to embodiment 2 has two cylindrical surfaces on the inside and outside diameter, either directly through press fits or indirectly through Joining aids of the above methods as Joint connection with sealing function.

Claims (7)

Glühstiftkerze (10) zur Anordnung im Brennraum luftverdichtender Brennkraftmaschinen, mit einem rohrförmigen, metallischen Kerzengehäuse (11), in dessen Längsbohrung (11A) ein Glühstift (13) mit einem Teil seiner Länge abdichtend fixiert ist, sowie mit einem zur Stromzuführung dienenden Anschlußbolzen, dadurch gekennzeichnet, daß der Anschlußbolzen (12) mittels eines einstückigen Rohrelementes (15), das an seinem am Kerzengehäuse (11) liegenden Ende zwei Dichtflächen (18, 19) und an seiner außenliegenden Mantelfläche ein Formschlußelement (23) aufweist, mit dem Kerzengehäuse abdichtend verbunden ist.Glow plug (10) for arrangement in the combustion chamber air-compressing internal combustion engines, with one tubular, metallic candle housing (11), in the Longitudinal bore (11A) a glow plug (13) with part of it Length is fixed sealingly, as well as with a Power supply connecting bolts, thereby characterized in that the connecting bolt (12) by means of a one-piece tubular element (15) which on its Candle housing (11) end two sealing surfaces (18, 19) and on its outer surface Has positive locking element (23) with the candle housing is sealingly connected. Glühstiftkerze nach Anspruch 1, dadurch gekennzeichnet, daß die abdichtende Verbindung (16) zwischen Anschlußbolzen (12) und Rohrelement (15) ein Gewinde ist,Glow plug according to claim 1, characterized in that the sealing connection (16) between connection bolts (12) and pipe element (15) is a thread, Glühstiftkerze nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindung (16) zwischen Anschlußbolzen (12) und Rohrelement (15) eine Schweiß-, Klebe-, Einpreß- oder Verstemmverbindung ist.Glow plug according to claim 1, characterized in that the connection (16) between the connecting bolts (12) and Pipe element (15) a welding, gluing, pressing or Caulking connection is. Glühstiftkerze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Formschlußelement (23) ein an der Außenseite des Rohrelements (15) ausgebildeter Wulst (23) beliebiger Geometrie und zugleich Fixiermittel des Steckers des motorseitigen Kabelbaums ist.Glow plug according to one of claims 1 to 3, characterized characterized in that the positive locking element (23) on the Bulge (23) formed on the outside of the tubular element (15) Any geometry and at the same time fixative of the connector of the engine side harness. Glühstiftkerze nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß an der innenliegenden Stirnseite des Rohrelements (15) eine außenliegende und eine innenliegende Dichtfläche (18,19) ausgebildet ist.Glow plug according to one of claims 1 to 4, characterized characterized in that on the inner face of the Pipe element (15) an outside and an inside Sealing surface (18,19) is formed. Glühstiftkerze nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Rohrelement (15) auch eine elektrische Isolation zwischen Anschlußbolzen (12) und Kerzengehäuse (11) bildet.Glow plug according to one of claims 1 to 5, characterized characterized in that the tubular element (15) also a electrical insulation between the connecting bolts (12) and Candle housing (11) forms. Glühstiftkerze nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Rohrelement (15) auch ein Zentriermittel für den Anschlußbolzen bezüglich des Kerzengehäuses ist.Glow plug according to one of claims 1 to 6, characterized characterized in that the tubular element (15) also a Centering means for the connecting bolt with respect to the Candle case is.
EP99100628A 1998-02-12 1999-01-14 Sheathed-element glow plug Expired - Lifetime EP0937945B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19805578A DE19805578C1 (en) 1998-02-12 1998-02-12 Glow pin plug for internal combustion engine
DE19805578 1998-02-12

Publications (2)

Publication Number Publication Date
EP0937945A1 true EP0937945A1 (en) 1999-08-25
EP0937945B1 EP0937945B1 (en) 2003-05-14

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Application Number Title Priority Date Filing Date
EP99100628A Expired - Lifetime EP0937945B1 (en) 1998-02-12 1999-01-14 Sheathed-element glow plug

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EP (1) EP0937945B1 (en)
JP (1) JPH11281058A (en)
DE (2) DE19805578C1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3021094A1 (en) * 2014-05-13 2015-11-20 Bosch Gmbh Robert PREHEATING ELECTRODE WITH INSULATION SEAL

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53141840A (en) * 1977-05-16 1978-12-11 Ngk Spark Plug Co Ltd Manufacturing method of sheathed glow plug
US4281451A (en) * 1978-02-10 1981-08-04 General Motors Corporation Electric heater -method of making
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
EP0745808A1 (en) * 1995-05-31 1996-12-04 Cooper Industries Italia S.p.A. A seal for sealing and automatically cleaning a sheathed element of a heater plug for Diesel engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231321A (en) * 1983-06-13 1984-12-26 Ngk Spark Plug Co Ltd Self-control type glow plug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53141840A (en) * 1977-05-16 1978-12-11 Ngk Spark Plug Co Ltd Manufacturing method of sheathed glow plug
US4281451A (en) * 1978-02-10 1981-08-04 General Motors Corporation Electric heater -method of making
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
EP0745808A1 (en) * 1995-05-31 1996-12-04 Cooper Industries Italia S.p.A. A seal for sealing and automatically cleaning a sheathed element of a heater plug for Diesel engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 003, no. 016 (M - 048) 10 February 1979 (1979-02-10) *

Also Published As

Publication number Publication date
EP0937945B1 (en) 2003-05-14
DE59905520D1 (en) 2003-06-18
DE19805578C1 (en) 1999-04-22
JPH11281058A (en) 1999-10-15

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