EP1125475B1 - Ceramic sheathed element glow plug - Google Patents
Ceramic sheathed element glow plug Download PDFInfo
- 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
Links
- 239000000919 ceramic Substances 0.000 title claims description 60
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 4
- 239000002131 composite material Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- LNUFLCYMSVYYNW-ZPJMAFJPSA-N [(2r,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6r)-6-[(2r,3r,4s,5r,6r)-6-[(2r,3r,4s,5r,6r)-6-[[(3s,5s,8r,9s,10s,13r,14s,17r)-10,13-dimethyl-17-[(2r)-6-methylheptan-2-yl]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1h-cyclopenta[a]phenanthren-3-yl]oxy]-4,5-disulfo Chemical compound O([C@@H]1[C@@H](COS(O)(=O)=O)O[C@@H]([C@@H]([C@H]1OS(O)(=O)=O)OS(O)(=O)=O)O[C@@H]1[C@@H](COS(O)(=O)=O)O[C@@H]([C@@H]([C@H]1OS(O)(=O)=O)OS(O)(=O)=O)O[C@@H]1[C@@H](COS(O)(=O)=O)O[C@H]([C@@H]([C@H]1OS(O)(=O)=O)OS(O)(=O)=O)O[C@@H]1C[C@@H]2CC[C@H]3[C@@H]4CC[C@@H]([C@]4(CC[C@@H]3[C@@]2(C)CC1)C)[C@H](C)CCCC(C)C)[C@H]1O[C@H](COS(O)(=O)=O)[C@@H](OS(O)(=O)=O)[C@H](OS(O)(=O)=O)[C@H]1OS(O)(=O)=O LNUFLCYMSVYYNW-ZPJMAFJPSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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)
Description
Die Erfindung geht aus von einer keramischen Glühstiftkerze für Dieselmotoren nach der Gattung des Hauptanspruchs. Es ist schon eine solche Glühstiftkerze aus der DE-OS 3 837 128 bekannt, bei welcher eine keramische Heizvorrichtung von der Spitze eines zylidrischen Halters gehalten wird. Die keramische Heizvorrichtung ist hierbei gegen den Halter elektrisch isoliert. Auf der Seite des zylindrischen Halters, die der keramischen Heizvorrichtung gegenüber liegt ist eine Anschlußvorrichtung vorgesehen, welche mit der Versorgungsspannung kontaktiert ist. Die keramische Heizvorrichtung besteht aus einem U-förmigen Heizabschnitt, wobei die beiden Enden des U-förmigen Heizausschnittes jeweils mit der Anschlußvorrichtung kontaktiert sind. Während eines Glühvorganges wird an die keramische Heizvorrichtung eine Spannung derart angelegt, daß ein Strom von einem Ende des U-förmigen Heizabschnittes über die brennraumseitige Spitze des Heizabschnittes zum anderen Ende des U-förmigen Heizabschnittes fließt. Der Strom bewirkt aufgrund des Widerstandes der Keramik die Erwärmung des Heizabschnittes, so daß dieser glüht und das Brennstoff-Luft-Gemisch für eine Entzündung erwärmt wird.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. During an annealing process, 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.
Die erfindungsgemäße keramische Glühstiftkerze mit den Merkmalen des Hauptanspruchs hat den Vorteil, daß eine sehr einfache Kontaktierung des keramischen Heizelementes ohne zusätzliche eingesinterte Anschlußkontakte möglich ist. Ferner hat die Kontaktierung der keramischen Heizvorrichtung, welche die Form eines Glühstiftes hat, ohne stoffschlüssige Verbindung durch einfache Gestaltung von Kontaktflächen in der Isolierung den Vorteil, daß auf eingesinterte metallische Zuleitung verzichtet werden kann. Damit ist sichergestellt, daß keine Schwächung der Keramik durch eingesinterte Fremdkörper oder eine Beschädigung der Keramik oder des Kontaktes bei der Montage erfolgt. Die Fertigung wird letztendlich einfacher und damit kostengünstiger. Gleichzeitig wird durch das Einbringen einer Dichtpackung zwischen Gehäuseinnenwand und Außenwand der keramischen Heizvorrichtung eine sehr gute Abdichtung gegenüber dem Brennraum mit einer gleichzeitigen verbesserten Kontaktierung erreicht.The ceramic glow plug with the invention Features of the main claim 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.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen keramischen Glühstiftkerze möglich.By the measures listed in the subclaims advantageous developments and improvements in Main claim specified ceramic glow plug possible.
Besonders vorteilhaft ist, daß der Glühstift im brennraumfernen Bereich einen Abschnitt größeren Durchmessers aufweist, da die so entstehende Schulter zwischen dem Abschnitt mit geringerem Durchmesser und dem Abschnitt mit größerem Durchmesser beim Einsetzen des Glühstiftes in das Gehäuse das Dichtmaterial zusammenschiebt und so eine sehr gute Verdichtung gewährleistet ist. Die Abdichtung der brennraumfernen Bauteile der Glühstiftkerze zum Brennraum ist damit wesentlich verbessert. Letztendlich werden die zur Erreichung einer sicheren Massekontaktierung und Motorraumabdichtung notwendigen Flächenpressungen minimiert, wodurch wiederum die tangentialen Zugspannungen in dem Keramikglühstift verringert werden. Die Verwendung einer Kontaktfeder für die Anbindung der brennraumfernen Stirnseite des einen Endes der u-förmigen Heizvorrichtung zur Kontaktierung mit der Versorgungsspannung ermöglicht außerdem einen Ausgleich von unterschiedlichen Schichtdicken zwischen der isolierenden Schicht und den Aussparungen in dieser isolierenden Schicht. Damit wird ebenfalls eine sichere Kontaktierung gewährleistet. Da die für einen sicheren Kontakt notwendigen Anpresskräfte bei dem erfindungsgemäßen Glühstift gering sind, werden keine zusätzlichen Zugspannungen im dem Keramikglühstift erzeugt. Die Verwendung einer Pulverdichtung als Dichtmasse zwischen Gehäuse und Glühstift stellt sicher, daß keine besonderen Anforderungen an die Oberflächengüte zur Abdichtung gestellt werden. Dadurch können keine Spannungsüberhöhungen durch eine Oberflächenrauheit entstehen.It is particularly advantageous that 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. This also becomes a secure contacting guaranteed. Because for one necessary contact forces at the contact Glow pencil according to the invention are low, none generated additional tensile stresses in the ceramic glow pencil. The use of a powder seal as a sealant between Housing and glow plug ensures that no special ones Requirements placed on the surface quality for sealing become. As a result, no voltage increases can occur surface roughness arise.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 die erfindungsgemäße Glühstiftkerze und Figur 2 den keramischen Glühstift.Embodiments of the invention are in the drawing shown and in the description below explained. 1 shows the invention Glow plug and Figure 2 the ceramic glow plug.
Figur 1 zeigt einen Längsschnitt durch eine erfindungsgemäße
keramische Glühstiftkerze. Die Glühstiftkerze besteht
hierbei aus einem zylindrischen rohrförmigen Metallgehäuse,
welches das Kerzengehäuse 10 darstellt. Das Kerzengehäuse 10
umfaßt an seinem brennraumseitigen Ende 11 eine keramische
Heizvorrichtung 12. Diese keramische Heizvorrichtung 12 ist
ein als keramischer Schichtverbund ausgeführter Glühstift,
welcher aus einer isolierenden Kompositkeramikschicht L3,
die zwischen zwei elektrisch leitenden
Kompositkeramikschichten 14 liegt, besteht. Die elektrisch
leitenden Kompositkeramikschichten sind im wesentlichen u-förmig
angeordnet. An der Spitze der keramischen
Heizvorrichtung sind die beiden elektrisch leitenden
Kompositkeramikschichten 14 durch einen dünnen Steg aus
elektrisch leitender Kompositkeramik verbunden. Die
Isolation und elektrische Kontaktierung des Glühstiftes soll
weiter unten anhand von Figur 2 erläutert werden. Der
elektrische Widerstand im Bereich der Glühspitze ist durch
eine starke Verringerung des elektrisch leitenden
Querschnittes und/oder durch Verwendung einer Keramik mit
höherem spezifischen elektrischen Widerstand höher als in
den beiden Schenkeln der u-förmigen elektrisch leitenden
Kompositkeramikschichten. Beim Anlegen einer Spannung fließt
der Glühstrom damit vom Ende des einen Schenkels der u-förmigen
keramischen Heizvorrichtung über die
brennraumseitige Spitze in den anderen Schenkel der u-förmigen
keramischen Heizvorrichtung, wo dann über eine
elektrische Anbindung an das Kerzengehäuse die
Massekontaktierung erfolgt. Die brennraumseitige Spitze der
keramischen Heizvorrichtung glüht aufgrund der Gestaltung,
daß der Widerstand hier am größten ist, zuerst. Die
elektrisch leitfähige Keramik hat durch geeignete Füllstoffe
einen positiven Temperaturkoeffizienten des elektrischen
Widerstandes, so daß der elektrische Widerstand mit
zunehmender Temperatur ansteigt, was wiederum bewirkt, daß
sich die Glühstifttemperatur selbst regelt. Die
Aufheizgeschwindigkeit und die Beharrungstemperatur des
Glühstiftes können im wesentlich durch das
Widerstandsverhältnis von Spitze und Zuleitung, die
Spitzengeometrie, den spezifischen elektrischen Widerstand
der Keramik und den Temperaturkoeffizienten der Keramik
eingestellt werden.Figure 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
Die keramische Heizvorrichtung 12, auch mit Glühstift
bezeichnet, weist in ihrem vom zylindrischen Kerzengehäuse
10 umfaßten hinteren Abschnitt einen Bereich größeren
Durchmessers 15 auf. Der Durchmesser dieses hinteren
Abschnittes des Glühstiftes ist so gewählt, daß der
Glühstift beim Zusammenbau der Glühstiftkerze im Gehäuse 10
verschiebbar ist. Der Glühstift beziehungsweise die
keramische Heizvorrichtung 12 wird im zylindrischen
Kerzengehäuse 10 so montiert, daß sich zwischen der
Innenwand des rohrförmigen Metallgehäuses 11 und der
Außenwand der keramischen Heizvorrichtung 12 im Bereich des
kleineren Durchmessers ein Hohlraum 17 bildet, der mit einem
elektrisch leitfähigen, verdichtbarem Material 18 ausgefüllt
ist. Dieses elektrisch leitfähige Material 18 kann
beispielsweise Graphit, ein Metallpulver, eine
Pulvermischung aus Keramik und leitfähigen Partikeln oder
ein aus Graphitfolie gewickelter Hohlzylinder sein.The
Bei der Montage der Glühstiftkerze wird zunächst das
elektrisch leitende Material 18 von der brennraumfernen
Öffnung des Kerzengehäuses 10 in das Kerzengehäuse 10 in
Form eines Vorpreßlings eingebracht und anschließend der
Glühstift eingesetzt. An die keramische Heizvorrichtung 12
schließt sich brennraumfern im Kerzengehäuse 10 eine
Keramikhülse 19 und im weiteren ein Metallring 16 an.
Mittels Krafteinwirkung auf diese zusammengeführten Teile,
wird der Glühstift so in das Kerzengehäuse 10 eingedrückt,
daß das elektrisch leitfähige Material 18 verdichtet wird.
Während des Verdichtungsprozesses wird der Hohlraum 17 in
seinem Volumen verkleinert.When assembling the glow plug, that is first
electrically
In Figur 2 ist die keramische Heizvorrichtung 12 separat
dargestellt. Bei dieser Darstellung ist deutlich zu sehen,
daß der Glühstift über seine Länge durchgehend bis auf den
brennraumfernen Endabschnitt einen ersten Durchmesser und am
brennraumfernen Ende einen Abschnitt 15 größeren
Durchmessers aufweist. Der Glühstift ist zumindest in dem
Bereich, in welchem er vom Kerzengehäuse 10 umfaßt wird, mit
mit einer isolierenden Schicht 20, wobei diese isolierende Schicht 20 mittels Verglasen
hergestellt ist, überzogen. Der Bereich, in welchem diese isolierende Schicht 20
aufgebracht ist, ist in der Figur 2 mit einer Klammer gekennzeichnet. Zur elektrischen
Kontaktierung sind in der isolierenden Schicht 20 Aussparungen 21 und 22 angebracht.
Eine erste Aussparung 21 befindet sich auf der brennraumfemen Stirnseite des
Glühstiftes und zwar so, daß eine Kontaktierung des Anschlußbolzens mit einem
Schenkel der u-förmigen elektrisch leitenden Keramik erfolgt. Der zweite elektrische
Kontakt erfolgt an der seitlichen Außenwand des zweiten Schenkels der u-förmigen,
elektrisch leitenden Keramik. Der Kontakt dieser zweiten Aussparung 22 mit dem
Kerzengehäuse 10 erfolgt über eine Dichtmasse 18, wie dies der Figur 1 zu entnehmen
ist. In Figur 2 sind die Aussparungen 21 und 22 jeweils als Fläche gekennzeichnet.
Hierbei ist dann in Figur 2 gut zu erkennen, daß die Kontaktflächen so gewählt sind, daß
beim Anlegen einer Spannung der Glühstrom von einem Ende der u-förmigen
Heizvorrichtung 12 über die brennraumseitige Spitze zum anderen Ende der u-förmigen
Heizvorrichtung 12 fließt. Für eine gute Kontaktierung können die Aussparungen 21 und
22 jeweils mit einem Metallüberzug, beispielsweise Nickel, versehen werden.In Figure 2, the
Claims (7)
- Ceramic glow plug with a tubular metal housing (10) which, at its combustion-chamber side end (11), holds a ceramic, u-shaped heating device (12) in the form of a glow pin in a cantilevered manner, with a terminal stud, which is arranged on the side remote from the combustion chamber and makes electrical contact with the ceramic heating device (12), characterized in that the ceramic heating device (12), at least in the region in which it is surrounded by the metal housing (10), is covered by an insulating layer (20), and cutouts (21, 22) are provided in this insulating layer (20), a first cutout (21) being arranged on that end side of one end of the u-shaped ceramic heating device (12) which is remote from the combustion chamber and a second cutout (22) being arranged laterally on the outer wall of the other end of the u-shaped ceramic heating device (12), and an electrically conductive sealing compound (18) being arranged in the region of the second cutout (22) between the outer wall of the ceramic heating device (12) and the inner wall of the metal housing (10).
- Ceramic glow plug according to Claim 1, characterized in that the ceramic heating device (12), in the section surrounded by the metal housing (10) in a partial region (15) remote from the combustion chamber has a larger diameter, this larger diameter being selected in such a way that the ceramic heating device (12), during assembly, can be pushed into the metal housing (10) from the end remote from the combustion chamber.
- Ceramic glow plug according to Claim 1 and/or 2, characterized in that the insulating layer (20) is applied by means of glazing.
- Ceramic glow plug according to one of Claims 1 to 3, characterized in that the cutouts (21, 22) in the insulating layer (20) are metallized.
- Ceramic glow plug according to one of the preceding claims, characterized in that the electrically conductive sealing compound (18) is an electrically conductive powder.
- Ceramic glow plug according to Claim 5, characterized in that the electrically conductive sealing compound (18) is graphite, a metal powder or a powder mixture of ceramic with conductive particles.
- Ceramic glow plug according to one of Claims 1 to 4, characterized in that the electrically conductive sealing compound (18) is a hollow cylinder wound out of a graphite sheet.
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 (en) | 1998-09-28 | 1998-09-28 | Ceramic glow plug |
| PCT/DE1999/003098 WO2000019772A2 (en) | 1998-09-28 | 1999-09-25 | Ceramic sheathed element glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1125475A2 EP1125475A2 (en) | 2001-08-22 |
| EP1125475B1 true EP1125475B1 (en) | 2004-05-19 |
Family
ID=7882458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99955813A Expired - Lifetime EP1125475B1 (en) | 1998-09-28 | 1999-09-25 | Ceramic sheathed element glow plug |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6621196B1 (en) |
| EP (1) | EP1125475B1 (en) |
| JP (1) | JP2002526737A (en) |
| KR (1) | KR100620262B1 (en) |
| CZ (1) | CZ298663B6 (en) |
| DE (2) | DE19844347A1 (en) |
| ES (1) | ES2222041T3 (en) |
| SK (1) | SK4112001A3 (en) |
| WO (1) | WO2000019772A2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6660970B1 (en) | 1999-08-27 | 2003-12-09 | Robert Bosch Gmbh | Ceramic sheathed element glow plug |
| HU224369B1 (en) | 1999-08-27 | 2005-08-29 | Robert Bosch Gmbh. | Ceramic sheathed element glow plug and method production of its |
| DE10228077A1 (en) * | 2002-06-20 | 2004-01-08 | Friedrich-Schiller-Universität Jena | Method for forming electrically conductive connection between metal ring or sleeve and ceramic element, especially for diesel engine glow-plug, using compact and highly porous material-elastic, electrically conductive intermediate layer |
| DE10353972B4 (en) | 2003-11-19 | 2006-03-16 | Beru Ag | Method for producing ceramic glow plugs |
| DE102004011097A1 (en) * | 2004-03-06 | 2005-09-22 | Robert Bosch Gmbh | Device for detecting the combustion chamber pressure in an internal combustion engine |
| EP1637806B1 (en) * | 2004-09-15 | 2012-02-01 | Beru AG | Glow plug with pressure sensor for a diesel engine |
| DE102005017802A1 (en) * | 2005-04-18 | 2006-10-19 | Robert Bosch Gmbh | Glow plug with combustion chamber pressure sensor and sealing element |
| DE102005024623B4 (en) * | 2005-05-30 | 2007-08-23 | Beru Ag | Method for producing a ceramic glow plug for a glow plug |
| DE102005029839A1 (en) | 2005-06-27 | 2007-01-04 | Robert Bosch Gmbh | glow plug |
| KR100918237B1 (en) * | 2007-10-31 | 2009-09-21 | 주식회사 유라테크 | Glow plug |
| US8164241B2 (en) * | 2008-08-15 | 2012-04-24 | Federal Mogul Ignition Company | Extension-type spark plug |
| DE102013211689A1 (en) | 2013-06-20 | 2014-12-24 | Robert Bosch Gmbh | Sheathed-type glow plug and method for its production |
Family Cites Families (7)
| 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 (en) * | 1987-05-29 | 1988-12-08 | Jidosha Kiki Co | GLOW PLUG FOR DIESEL ENGINES |
| JPH04143518A (en) | 1990-10-04 | 1992-05-18 | Ngk Spark Plug Co Ltd | Self-regulative type ceramic glow plug |
| US5304778A (en) * | 1992-11-23 | 1994-04-19 | Electrofuel Manufacturing Co. | Glow plug with improved composite sintered silicon nitride ceramic heater |
| DE19852785A1 (en) * | 1998-09-28 | 2000-03-30 | Bosch Gmbh Robert | Ceramic glow plug |
-
1998
- 1998-09-28 DE DE19844347A patent/DE19844347A1/en not_active Withdrawn
-
1999
- 1999-09-25 KR KR1020017003656A patent/KR100620262B1/en not_active Expired - Fee Related
- 1999-09-25 JP JP2000573129A patent/JP2002526737A/en active Pending
- 1999-09-25 SK SK411-2001A patent/SK4112001A3/en unknown
- 1999-09-25 DE DE59909539T patent/DE59909539D1/en not_active Expired - Lifetime
- 1999-09-25 ES ES99955813T patent/ES2222041T3/en not_active Expired - Lifetime
- 1999-09-25 WO PCT/DE1999/003098 patent/WO2000019772A2/en not_active Ceased
- 1999-09-25 EP EP99955813A patent/EP1125475B1/en not_active Expired - Lifetime
- 1999-09-25 CZ CZ20011074A patent/CZ298663B6/en not_active IP Right Cessation
- 1999-09-25 US US09/806,272 patent/US6621196B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19844347A1 (en) | 2000-03-30 |
| ES2222041T3 (en) | 2005-01-16 |
| US6621196B1 (en) | 2003-09-16 |
| WO2000019772A3 (en) | 2000-07-27 |
| KR20010075281A (en) | 2001-08-09 |
| DE59909539D1 (en) | 2004-06-24 |
| JP2002526737A (en) | 2002-08-20 |
| CZ20011074A3 (en) | 2002-01-16 |
| EP1125475A2 (en) | 2001-08-22 |
| CZ298663B6 (en) | 2007-12-12 |
| SK4112001A3 (en) | 2002-01-07 |
| KR100620262B1 (en) | 2006-09-13 |
| WO2000019772A2 (en) | 2000-04-06 |
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