EP1125475B1 - Bougie-crayon de prechauffage ceramique - Google Patents

Bougie-crayon de prechauffage ceramique Download PDF

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Publication number
EP1125475B1
EP1125475B1 EP99955813A EP99955813A EP1125475B1 EP 1125475 B1 EP1125475 B1 EP 1125475B1 EP 99955813 A EP99955813 A EP 99955813A EP 99955813 A EP99955813 A EP 99955813A EP 1125475 B1 EP1125475 B1 EP 1125475B1
Authority
EP
European Patent Office
Prior art keywords
ceramic
glow plug
heating device
electrically conductive
combustion chamber
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.)
Expired - Lifetime
Application number
EP99955813A
Other languages
German (de)
English (en)
Other versions
EP1125475A2 (fr
Inventor
Albrecht Geissinger
Gert Lindemann
Christoph Haluschka
Thomas Nething
Wolfgang Dressler
Friederike Lindner
Horst Boeder
Matthias Rowek
Wolfgang Otterbach
Christoph Kern
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
Priority to SI9930615T priority Critical patent/SI1125475T1/xx
Publication of EP1125475A2 publication Critical patent/EP1125475A2/fr
Application granted granted Critical
Publication of EP1125475B1 publication Critical patent/EP1125475B1/fr
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 is based on a ceramic glow plug for diesel engines according to the genus of the main claim. It is such a glow plug from DE-OS 3 837 128 known in which a ceramic heater from the Tip of a cylindrical holder is held. The Ceramic heater is against the holder electrically isolated. On the side of the cylindrical Holder that is opposite the ceramic heater a connection device is provided, which with the Supply voltage is contacted.
  • the ceramic Heater consists of a U-shaped heating section, with the two ends of the U-shaped heating cutout are each contacted with the connection device.
  • the ceramic Heater applied a voltage such that a current from one end of the U-shaped heating section over the Combustion chamber tip of the heating section to the other end of the U-shaped heating section flows.
  • the current causes due to the resistance of the ceramic, the heating of the Heating section so that it glows and the fuel-air mixture is heated for inflammation.
  • the ceramic glow plug with the invention has the advantage that a very easy contacting of the ceramic heating element without additional sintered connection contacts is possible. Furthermore, the contacting of the ceramic Heater, which has the shape of a glow pencil, without cohesive connection by simple design of Contact surfaces in the insulation have the advantage that sintered metallic supply line can be dispensed with. This ensures that there is no weakening of the ceramic due to sintered foreign bodies or damage to the Ceramic or the contact is made during assembly. The Ultimately, manufacturing becomes easier and thus cost-effective. At the same time, by introducing a sealing packing between the inner wall of the housing and the outer wall the ceramic heater has a very good seal opposite the combustion chamber with a simultaneous improved contacting achieved.
  • the glow plug in area far away from the combustion chamber Diameter, because the shoulder thus created between the smaller diameter section and the Section with a larger diameter when inserting the Glow pin pushes the sealing material together in the housing and so a very good compression is guaranteed.
  • the Sealing the components of the glow plug far from the combustion chamber to the combustion chamber is significantly improved. At long last are used to achieve safe ground contact and engine compartment sealing necessary surface pressures minimized, which in turn reduces the tangential tensile stresses be reduced in the ceramic glow pencil.
  • the usage a contact spring for connecting the distant combustion chamber Face of one end of the U-shaped heater enables contacting with the supply voltage also a compensation of different layer thicknesses between the insulating layer and the recesses in this insulating layer.
  • FIG. 1 shows a longitudinal section through an inventive ceramic glow plug.
  • the glow plug is there here from a cylindrical tubular metal housing, which represents the candle housing 10.
  • the candle case 10 comprises a ceramic at its combustion chamber end 11 Heater 12.
  • This ceramic heater 12 is a glow pencil designed as a ceramic layer composite, which consists of an insulating composite ceramic layer L3, between two electrically conductive Composite ceramic layers 14 is there.
  • the electric conductive composite ceramic layers are essentially U-shaped arranged.
  • At the top of the ceramic Heater are the two electrically conductive Composite ceramic layers 14 through a thin web electrically conductive composite ceramic connected.
  • the Isolation and electrical contacting of the glow plug should are explained below with reference to FIG. 2.
  • the electrical resistance in the area of the glow tip is through a strong reduction in the electrically conductive Cross-section and / or by using a ceramic with higher specific electrical resistance higher than in the two legs of the u-shaped electrically conductive Kompositkeramik füren.
  • the glow current thus from the end of one leg of the u-shaped ceramic heater over the Combustion chamber tip in the other leg of the U-shaped ceramic heater where then over a electrical connection to the candle housing Ground contact is made.
  • the tip of the combustion chamber ceramic heater glows due to the design, that the resistance is greatest here, first.
  • the electrically conductive ceramic has suitable fillers a positive temperature coefficient of electrical Resistance, so that the electrical resistance with increasing temperature increases, which in turn causes the glow plug temperature regulates itself.
  • the Heating rate and the steady temperature of the Glow plug can essentially by that Resistance ratio of tip and lead, the Top geometry, the specific electrical resistance of the ceramic and the temperature coefficient of the ceramic can be set.
  • the ceramic heater 12, also with glow plug referred to, has in their cylindrical candle housing 10 covered an area larger rear portion Diameter 15 on.
  • the diameter of this rear Section of the glow plug is chosen so that the Glow plug when assembling the glow plug in the housing 10 is movable.
  • the glow pencil or the Ceramic heater 12 is cylindrical Candle housing 10 mounted so that between the Inner wall of the tubular metal housing 11 and the Outer wall of the ceramic heater 12 in the area of smaller diameter forms a cavity 17 which with a electrically conductive, compressible material 18 filled is.
  • This electrically conductive material 18 can for example graphite, a metal powder, a Powder mixture of ceramic and conductive particles or be a hollow cylinder wound from graphite foil.
  • the glow plug When assembling the glow plug, that is first electrically conductive material 18 from the combustion chamber Opening the candle housing 10 in the candle housing 10 in Form of a pre-pressed introduced and then the Glow plug inserted. To the ceramic heater 12 closes in the candle housing 10 remote from the combustion chamber Ceramic sleeve 19 and a metal ring 16 on. By applying force to these merged parts, the glow plug is pressed into the candle housing 10 in such a way that the electrically conductive material 18 is compressed. During the compression process, the cavity 17 in reduced in volume.
  • the ceramic heater 12 is separate shown.
  • the glow plug is continuous over its length except for the end section distant from the combustion chamber has a first diameter and at end distant from the combustion chamber, a section 15 larger Has diameter.
  • the glow plug is at least in that Area in which it is covered by the candle housing 10 with with an insulating layer 20, this insulating layer 20 by means of glazing is made, coated.
  • the area in which this insulating layer 20 is applied, is indicated in Figure 2 with a bracket.
  • For electrical Recesses 21 and 22 are provided in the insulating layer 20.
  • a first recess 21 is located on the end face of the combustion chamber Glow plug in such a way that contacting of the connecting bolt with a Leg of the U-shaped electrically conductive ceramic takes place.
  • the second electrical Contact is made on the lateral outer wall of the second leg of the U-shaped, electrically conductive ceramic.
  • the contact of this second recess 22 with the Candle housing 10 takes place via a sealing compound 18, as can be seen in FIG. 1 is.
  • the recesses 21 and 22 are each identified as a surface. It can then be clearly seen in FIG. 2 that the contact surfaces are selected such that when applying a voltage the glow current from one end of the u-shaped Heater 12 over the combustion chamber tip to the other end of the U-shaped Heater 12 flows.
  • the recesses 21 and 22 are each provided with a metal coating, for example nickel.

Landscapes

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

Claims (7)

  1. Bougie crayon de préchauffage céramique comprenant un boítier métallique tubulaire (10), qui à son extrémité (11) côté chambre de combustion porte en saillie un dispositif de chauffage (12) en U en forme d'un crayon de préchauffage, comprenant un boulon de raccordement disposé du côté éloigné de la chambre de combustion et étant en contact électrique avec le dispositif de chauffage céramique (12),
    caractérisée en ce que
    le dispositif de chauffage céramique (12), du moins dans la zone dans laquelle il est entouré par le boítier métallique (10), est revêtu d'une couche isolante (20), et dans cette couche isolante (20) des évidements (21, 22) sont prévus, un premier évidement (21) étant disposé sur une face frontale, éloignée de la chambre de combustion, de l'une extrémité du dispositif de chauffage céramique (12) en U, et un deuxième évidement (22) étant disposé latéralement sur la paroi extérieure de l'autre extrémité du dispositif de chauffage céramique (12) en U, et dans la zone du deuxième évidement (22) une masse d'étanchéité (18) électriquement conductrice est disposée est la paroi extérieure du dispositif de chauffage céramique (12) et la paroi intérieure du boítier métallique (10).
  2. Bougie crayon de préchauffage céramique selon la revendication 1,
    caractérisée en ce que
    le dispositif de chauffage céramique (12), dans la section entourée par le boítier métallique (10), dans une zone partielle (15) éloignée de la chambre de combustion, présente un diamètre plus grand, ce diamètre plus grand étant choisi de manière à permettre, lors d'un assemblage, de faire glisser le dispositif de chauffage céramique (12) depuis l'extrémité éloignée de la chambre de combustion dans le boítier métallique (10).
  3. Bougie crayon de préchauffage céramique selon la revendication 1 et/ou 2,
    caractérisée en ce que
    la couche isolante (20) est appliquée par vitrification.
  4. Bougie crayon de préchauffage céramique selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    les évidements (21, 22) sont métallisés dans la couche isolante (20).
  5. Bougie crayon de préchauffage céramique selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la masse d'étanchéité (18) électriquement conductrice est une poudre électriquement conductrice.
  6. Bougie crayon de préchauffage céramique selon la revendication 5,
    caractérisée en ce que
    la masse d'étanchéité (18) électriquement conductrice est du graphite, une poudre métallique ou un mélange de poudres en céramique avec des particules conductrices.
  7. Bougie crayon de préchauffage céramique selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    la masse d'étanchéité (18) électriquement conductrice est un cylindre creux bobiné en feuille de graphite.
EP99955813A 1998-09-28 1999-09-25 Bougie-crayon de prechauffage ceramique Expired - Lifetime EP1125475B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9930615T SI1125475T1 (en) 1998-09-28 1999-09-25 Ceramic sheathed element glow plug

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19844347 1998-09-28
DE19844347A DE19844347A1 (de) 1998-09-28 1998-09-28 Keramische Glühstiftkerze
PCT/DE1999/003098 WO2000019772A2 (fr) 1998-09-28 1999-09-25 Bougie-crayon de prechauffage ceramique

Publications (2)

Publication Number Publication Date
EP1125475A2 EP1125475A2 (fr) 2001-08-22
EP1125475B1 true EP1125475B1 (fr) 2004-05-19

Family

ID=7882458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99955813A Expired - Lifetime EP1125475B1 (fr) 1998-09-28 1999-09-25 Bougie-crayon de prechauffage ceramique

Country Status (9)

Country Link
US (1) US6621196B1 (fr)
EP (1) EP1125475B1 (fr)
JP (1) JP2002526737A (fr)
KR (1) KR100620262B1 (fr)
CZ (1) CZ298663B6 (fr)
DE (2) DE19844347A1 (fr)
ES (1) ES2222041T3 (fr)
SK (1) SK4112001A3 (fr)
WO (1) WO2000019772A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2231250T3 (es) 1999-08-27 2005-05-16 Robert Bosch Gmbh Bujia incandescente tipo espiga ceramica.
EP1125086B1 (fr) 1999-08-27 2004-04-21 Robert Bosch Gmbh Bougie crayon de prechauffage en ceramique
DE10228077A1 (de) * 2002-06-20 2004-01-08 Friedrich-Schiller-Universität Jena Verfahren zur Herstellung einer mechanisch stabilen und elektrisch leitfähigen Verbindung zwischen einem metallischen Aufnahmeelement und einem vorzugsweise stiftförmigen keramischen Element, insbesondere bei Glühkerzen für Dieselmotoren
DE10353972B4 (de) * 2003-11-19 2006-03-16 Beru Ag Verfahren zum Herstellen von keramischen Glühkerzen
DE102004011097A1 (de) * 2004-03-06 2005-09-22 Robert Bosch Gmbh Vorrichtung zur Erfassung des Brennraumdrucks bei einer Brennkraftmaschine
ATE544034T1 (de) * 2004-09-15 2012-02-15 Beru Ag Druckmessglühkerze für einen dieselmotor
DE102005017802A1 (de) * 2005-04-18 2006-10-19 Robert Bosch Gmbh Glühstiftkerze mit Brennraumdrucksensor und Dichtelement
DE102005024623B4 (de) * 2005-05-30 2007-08-23 Beru Ag Verfahren zum Herstellen eines keramischen Glühstiftes für eine Glühkerze
DE102005029839A1 (de) * 2005-06-27 2007-01-04 Robert Bosch Gmbh Glühstiftkerze
KR100918237B1 (ko) * 2007-10-31 2009-09-21 주식회사 유라테크 글로우 플러그
US8164241B2 (en) 2008-08-15 2012-04-24 Federal Mogul Ignition Company Extension-type spark plug
DE102013211689A1 (de) 2013-06-20 2014-12-24 Robert Bosch Gmbh Glühstiftkerze und Verfahren zu deren Herstellung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4312120A (en) * 1980-05-22 1982-01-26 Bendix Autolite Corporation Glow plug manufacture
US4418661A (en) * 1981-02-07 1983-12-06 Robert Bosch Gmbh Glow plug, particularly for diesel engine
US4661686A (en) 1984-04-12 1987-04-28 Ngk Spark Plug Co., Ltd Dual line ceramic glow plug
DE3817843A1 (de) * 1987-05-29 1988-12-08 Jidosha Kiki Co Gluehkerze fuer dieselmotoren
JPH04143518A (ja) * 1990-10-04 1992-05-18 Ngk Spark Plug Co Ltd 自己制御型セラミックグロープラグ
US5304778A (en) * 1992-11-23 1994-04-19 Electrofuel Manufacturing Co. Glow plug with improved composite sintered silicon nitride ceramic heater
DE19852785A1 (de) * 1998-09-28 2000-03-30 Bosch Gmbh Robert Keramische Glühstiftkerze

Also Published As

Publication number Publication date
DE19844347A1 (de) 2000-03-30
CZ298663B6 (cs) 2007-12-12
WO2000019772A3 (fr) 2000-07-27
KR100620262B1 (ko) 2006-09-13
ES2222041T3 (es) 2005-01-16
EP1125475A2 (fr) 2001-08-22
KR20010075281A (ko) 2001-08-09
CZ20011074A3 (cs) 2002-01-16
JP2002526737A (ja) 2002-08-20
DE59909539D1 (de) 2004-06-24
WO2000019772A2 (fr) 2000-04-06
US6621196B1 (en) 2003-09-16
SK4112001A3 (en) 2002-01-07

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