EP1125475A2 - Bougie-crayon de prechauffage ceramique - Google Patents

Bougie-crayon de prechauffage ceramique

Info

Publication number
EP1125475A2
EP1125475A2 EP99955813A EP99955813A EP1125475A2 EP 1125475 A2 EP1125475 A2 EP 1125475A2 EP 99955813 A EP99955813 A EP 99955813A EP 99955813 A EP99955813 A EP 99955813A EP 1125475 A2 EP1125475 A2 EP 1125475A2
Authority
EP
European Patent Office
Prior art keywords
ceramic
heating device
glow plug
combustion chamber
ceramic heating
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
EP99955813A
Other languages
German (de)
English (en)
Other versions
EP1125475B1 (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

Links

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 ceramic glow plug for diesel engines according to the preamble of the main claim.
  • a glow plug is already known from DE-OS 3 837 128, in which a ceramic heating device is held by the tip of a cylindrical holder. The ceramic heater is electrically isolated from the holder.
  • a ceramic heating device is held by the tip of a cylindrical holder.
  • the ceramic heater is electrically isolated from the holder.
  • the ceramic heating device consists of a U-shaped heating section, wherein the two ends of the U-shaped heating section are each contacted with the connection device.
  • a voltage is applied to the ceramic heating device such that a current flows from one end of the U-shaped heating section over the combustion chamber-side tip of the heating section to the other end of the U-shaped heating section. The current causes the heating section to heat up due to the resistance of the ceramic, so that it glows and the fuel-air mixture is heated for ignition.
  • the ceramic glow plug according to the invention with the features of the main claim has the advantage that a very simple contacting of the ceramic heating element without additional sintered connection contacts is possible. Furthermore, the contacting of the ceramic
  • Heating device which has the shape of a glow plug, without material connection by simple design of contact surfaces in the insulation, the advantage that sintered-in 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 during assembly. Ultimately, production becomes easier and therefore cheaper.
  • a sealing packing between the inner wall of the housing and the outer wall of the ceramic heating device a very good seal with respect to the combustion chamber is achieved with a simultaneous improved contact.
  • the glow plug has a section of larger diameter in the area remote from the combustion chamber, since the shoulder thus created pushes the sealing material together between the section with the smaller diameter and the section with a larger diameter when the glow plug is inserted into the housing, thus ensuring very good compression is.
  • the sealing of the components of the glow plug which are remote from the combustion chamber to the combustion chamber is thus significantly improved.
  • the surface pressures required to achieve safe ground contact and engine compartment sealing are minimized, which in turn reduces the tangential tensile stresses in the ceramic glow plug.
  • the use of a contact spring for connecting the distant combustion chamber also enables a compensation of different layer thicknesses between the insulating layer and the recesses in this insulating layer. This also ensures reliable contacting. Since the contact forces required for reliable contact are low in the glow plug according to the invention, no additional tensile stresses are generated in the ceramic glow plug.
  • the use of a powder seal as a sealing compound between the housing and the glow plug ensures that no special requirements are placed on the surface quality for sealing. This means that no stress increases due to surface roughness can occur.
  • FIG. 1 shows a longitudinal section through a ceramic glow plug according to the invention.
  • the glow plug consists of a cylindrical tubular metal housing, which represents the candle housing 10.
  • the candle housing 10 comprises a ceramic heating device 12 at its combustion chamber end 11.
  • This ceramic heating device 12 is a glow plug embodied as a ceramic layer composite, which consists of an insulating composite ceramic layer 13 which lies between two electrically conductive composite ceramic layers 14.
  • the electrically conductive composite ceramic layers are essentially u- arranged in a shape.
  • the two electrically conductive composite ceramic layers 14 are connected by a thin web made of electrically conductive composite ceramic. The insulation and electrical contacting of the glow plug will be explained below with reference to FIG. 2.
  • the electrical resistance in the region of the glow tip is higher than in the two legs of the U-shaped electrically conductive composite ceramic layers due to a strong reduction in the electrically conductive cross section and / or by using a ceramic with a higher specific electrical resistance.
  • the glow current therefore flows from the end of one leg of the U-shaped ceramic heating device via the tip on the combustion chamber side into the other leg of the U-shaped ceramic heating device, where the ground contact is then made via an electrical connection to the candle housing.
  • the combustion chamber tip of the ceramic heater glows first due to the design that the resistance is greatest here. Due to suitable fillers, the electrically conductive ceramic has a positive temperature coefficient of electrical resistance, so that the electrical resistance increases with increasing temperature, which in turn causes the glow plug temperature to regulate itself.
  • the heating rate and the steady-state temperature of the glow plug can essentially be set by the resistance ratio of tip and lead, the tip geometry, the specific electrical resistance of the ceramic and the temperature coefficient of the ceramic.
  • the ceramic heating device 12 also referred to as a glow plug, has a larger area in its rear section encompassed by the cylindrical candle housing 10 Diameter 15 on. The diameter of this rear section of the glow plug is selected so that the glow plug is displaceable in the housing 10 when the glow plug is assembled.
  • the glow plug or the ceramic heating device 12 is mounted in the cylindrical candle housing 10 in such a way that a cavity 17 is formed between the inner wall of the tubular metal housing 11 and the outer wall of the ceramic heating device 12 in the region of the smaller diameter, said cavity being made with an electrically conductive, compressible material 18 is filled out.
  • This electrically conductive material 18 can be, for example, graphite, a metal powder, a powder mixture of ceramic and conductive particles or a hollow cylinder wound from graphite foil.
  • the electrically conductive material 18 is first introduced into the candle housing 10 in the form of a preform from the opening of the candle housing 10 remote from the combustion chamber, and then the glow plug is inserted.
  • a ceramic sleeve 19 and further a metal ring 16 are connected to the ceramic heating device 12 in the candle housing 10 remote from the combustion chamber.
  • the glow plug is pressed into the candle housing 10 in such a way that the electrically conductive material 18 is compressed.
  • the volume 17 of the cavity 17 is reduced during the compression process.
  • the ceramic heater 12 is shown separately.
  • the glow plug has a first diameter throughout its length, except for the end section remote from the combustion chamber, and a section 15 of larger diameter at the end remote from the combustion chamber.
  • the glow plug is at least in the area in which it is encompassed by the candle housing 10 an insulating layer 20, this insulating layer being produced by means of glazing.
  • the area in which this insulating layer 20 is applied is hatched in FIG. 2.
  • For electrical contacting are in the insulating layer
  • the recesses 21 and 22 are each identified as a dark area. It can then be clearly seen in FIG. 2 that the contact surfaces are selected such that when a voltage is applied, the glow current flows from one end of the U-shaped heating device via the tip on the combustion chamber side to the other end of the U-shaped heating device.
  • the cutouts 21 and 22 can each be 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)

Abstract

L'invention concerne une bougie-crayon de préchauffage céramique. Selon l'invention, un support tubulaire métallique soutient en porte à faux un dispositif chauffant céramique en U et présente sur la face éloignée de la chambre de combustion un boulon connecteur pour appliquer une tension sur le dispositif chauffant céramique. Ce dernier présente à son extrémité entourée par le support, une section de diamètre plus important et est recouvert d'une couche isolante comportant des évidements pour une mise en contact électrique. Un évidement est prévu sur la face du dispositif chauffant céramique, éloignée de la chambre de combustion et un second évidement sur la paroi extérieure dudit dispositif chauffant céramique. Une matière d'étanchéité électroconductrice est placée entre la paroi extérieure du dispositif chauffant et la paroi intérieure du support.
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
DE19844347A DE19844347A1 (de) 1998-09-28 1998-09-28 Keramische Glühstiftkerze
DE19844347 1998-09-28
PCT/DE1999/003098 WO2000019772A2 (fr) 1998-09-28 1999-09-25 Bougie-crayon de prechauffage ceramique

Publications (2)

Publication Number Publication Date
EP1125475A2 true EP1125475A2 (fr) 2001-08-22
EP1125475B1 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
WO2001016529A1 (fr) 1999-08-27 2001-03-08 Robert Bosch Gmbh Bougie crayon de prechauffage en ceramique
HUP0202789A2 (en) 1999-08-27 2003-01-28 Bosch Gmbh Robert Ceramic sheathed element glow plug
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
EP1637806B1 (fr) * 2004-09-15 2012-02-01 Beru AG Bougie de préchauffage avec capteur de pression pour moteur diesel
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0019772A2 *

Also Published As

Publication number Publication date
SK4112001A3 (en) 2002-01-07
EP1125475B1 (fr) 2004-05-19
DE19844347A1 (de) 2000-03-30
KR20010075281A (ko) 2001-08-09
US6621196B1 (en) 2003-09-16
CZ20011074A3 (cs) 2002-01-16
KR100620262B1 (ko) 2006-09-13
DE59909539D1 (de) 2004-06-24
ES2222041T3 (es) 2005-01-16
WO2000019772A2 (fr) 2000-04-06
JP2002526737A (ja) 2002-08-20
WO2000019772A3 (fr) 2000-07-27
CZ298663B6 (cs) 2007-12-12

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