EP0560966B1 - Glow plug - Google Patents
Glow plug Download PDFInfo
- Publication number
- EP0560966B1 EP0560966B1 EP92921112A EP92921112A EP0560966B1 EP 0560966 B1 EP0560966 B1 EP 0560966B1 EP 92921112 A EP92921112 A EP 92921112A EP 92921112 A EP92921112 A EP 92921112A EP 0560966 B1 EP0560966 B1 EP 0560966B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- regulating
- heater plug
- coil
- plug according
- regulating coil
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- 239000010941 cobalt Substances 0.000 claims 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims 1
- 229910000531 Co alloy Inorganic materials 0.000 claims 1
- 229910000640 Fe alloy Inorganic materials 0.000 claims 1
- 229910017052 cobalt Inorganic materials 0.000 claims 1
- 238000010276 construction Methods 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 229940056345 tums Drugs 0.000 claims 1
- 230000007704 transition Effects 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 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 relates to a glow plug according to the preamble of Claim 1.
- Such a glow plug is described, for example, in DE-A-39 11 831.
- This glow plug has a glow tube, in which a filament is arranged, which with one in one Candle housing arranged connecting bolt is connected.
- This Connection is made through a central hole in the glow tube side End of the connecting bolt, this bore is an internal thread has, in which the filament, which is on its connection side End section with a smaller than the rest of the coil Diameter is provided, screwed in a form-fitting manner can be.
- DE-A-3825 013 discloses a glow plug in the control coil is formed in two or more pieces, the one section from known helical material and the other Section is made of a material that has a certain resistance ratio, based on a temperature ratio, and a sudden change in resistance in a certain temperature range having. This will significantly shorten the heating-up time with sufficient glow plug service life enables.
- the glow plugs known from the prior art Genus have the disadvantage that in the case of continuous annealing or prolonged glow in the running engine, which leads to more environmentally friendly Exhaust gas leads to low stability to the usual requirements for the stability of glow plugs are enough.
- the object of the invention is to circumvent the in the state the disadvantages shown in the art, a glow plug is available to provide the high stability even after prolonged afterglow having; at the same time, the preheat time that can be achieved so far are practically adhered to, as well as mass production can be done in the usual way and economically as before.
- This object is achieved by the glow plug according to claim 1 solved. Further advantageous embodiments of the invention result result from the following claims 2 to 11.
- the present invention provides a glow plug a glow tube is available, in which a heating element in the tip is arranged upstream of which a control element is, which is also arranged in the glow tube, the Control element made of a conductive material with positive Temperature resistance coefficient exists, and where the Inner pole of the glow plug with the control element, the control element with the heating element and the heating element with the glow tube tip are connected in series, characterized in that that to minimize heat transfer between the control element and the inner pole of the helical region has a winding diameter has less than half the diameter of the turns is the rule spiral.
- the wire length of area 3 preferably corresponds to about 1/10 to about 1/20 of the total wire length of the variable resistor at room temperature.
- the length of this part is preferably greater than approximately 2.5 to 4 mm, particularly preferably it has at least four Turns up.
- the winding diameter in area 3 should be the lower one Limit approximately four times the standard wire size.
- the slope of this part 3 is equal to or greater than that double wire thickness.
- control spiral area 2 (with a larger one Diameter) in one piece.
- it can or be formed in several pieces, the sub-areas in each case made of different alloys with different temperature resistance coefficients can exist.
- the solution according to the invention is particularly advantageous in the case where control coils with high temperature-resistance coefficients are used, for example where Resistance ratio of resistance greater at 20 ° C / 1,000 ° C than about 7.5 (at> 12 it becomes extremely critical); especially This also applies to control coils made of materials that are not a continuous but a sudden increase in the Have resistance, such as in the applications DE-A-38 25 013 and 39 23 582 is described. Under these Circumstances of the glow plugs according to the invention are permanent or longer glow in the running engine is particularly suitable.
- the embodiment according to FIG. 1 has a conventional inner pole 4 on.
- This inner pole 4 is particularly preferably made of a material that conducts electricity and has poor thermal conductivity produced.
- An example is a steel with a higher Cr-Ni content called, which, like others, the average specialist on the Alloy area is easily accessible. Since he's additionally through its composition is protected against rust, the cable connection needs (M5, M4 thread) not, as often required, with Rust protection.
- the invention which is not shown, is therefore the Inner pole from a current conducting and the heat bad conductive material.
- the intermediate area 3 can be dispensed with (or with an intermediate area 3 together, heat dissipation can be reduced even further).
- Fig. 2 shows a glow plug design according to the invention, in which the glow plug pin according to FIG. 1 is installed.
- the transition region 3 and the inner pole 4 by one per se known "plug connection" 8 with additional caulking together connected.
- control coil (s) 2 are practically the same temperature over their entire length can heat up, and that neither the axially refluxing heat from the area of the heating coil 7 still radially from the / Control coil (s) of heat spreading to the glow tube non-uniformly deducted and sufficient heat dissipation to the inner pole is severely disabled.
- the transition area 3 is in the standard version Invention in one piece and made of the same material like the adjacent control spiral area 2. According to the inventive However, this area 3 can also be designed from another Material than that of the adjoining area of the Control coil 2, the material of this area 3 then Current conductivity, but have low thermal conductivity should; such material and alloys are known per se and can also be, for example, the materials that were previously with regard to the inner pole, if this is small Has thermal conductivity.
- the Glow tube diameter about 6 mm; the diameter of the control coil 2 is approximately 3.8 mm and the diameter of the transition region 3 about 1.8 mm with a control wire thickness of about 0.35 mm.
- the Overall length of the control wire is 200 to 220 mm, whereby the length of the control wire in area 3 is approximately 12 mm.
- the solution according to the invention leads to the surprising Result that the maximum temperature of the glow pencil tip or Heating coil itself, in which the regulation begins, is lowered is so that on the one hand the preheating time is practically not reduced, the service life under afterglow conditions, however, is clear is increased.
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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)
Abstract
Description
Die Erfindung betrifft eine Glühkerze gemäß Oberbegriff des
Anspruchs 1.The invention relates to a glow plug according to the preamble of
Eine solche Glühkerze wird beispielsweise in der DE-A-39 11 831 beschrieben. Diese Glühkerze weist ein Glührohr auf, in dem eine Glühwendel angeordnet ist, die mit einem in einem Kerzengehäuse angeordneten Anschlußbolzen verbunden ist. Diese Verbindung erfolgt durch eine mittige Bohrung im glührohrseiti-gen Ende des Anschlußbolzens, wobei diese Bohrung ein Innengewinde aufweist, in das die Glühwendel, die an ihrem anschlußseitigen Endabschnitt mit einem gegenüber der übrigen Wendel verkleinerten Durchmesser versehen ist, formschlüssig eingeschraubt werden kann.Such a glow plug is described, for example, in DE-A-39 11 831. This glow plug has a glow tube, in which a filament is arranged, which with one in one Candle housing arranged connecting bolt is connected. This Connection is made through a central hole in the glow tube side End of the connecting bolt, this bore is an internal thread has, in which the filament, which is on its connection side End section with a smaller than the rest of the coil Diameter is provided, screwed in a form-fitting manner can be.
DE-A-3825 013 offenbart eine Glühkerze in der die Regelwendel zwei- oder mehrstückig ausgebildet ist, wobei der eine Abschnitt aus an sich bekanntem Regelwendelmaterial und der andere Abschnitt aus einem Material besteht, das ein bestimmtes Widerstandsverhältnis, bezogen auf ein Temperaturverhältnis, und eine sprunghafte Widerstandsänderung in einem bestimmten Temperaturbereich aufweist. Hierdurch wird eine wesentlich verkürzte Aufheizzeit bei gleichzeitig ausreichender Lebensdauer der Glühkerze ermöglicht.DE-A-3825 013 discloses a glow plug in the control coil is formed in two or more pieces, the one section from known helical material and the other Section is made of a material that has a certain resistance ratio, based on a temperature ratio, and a sudden change in resistance in a certain temperature range having. This will significantly shorten the heating-up time with sufficient glow plug service life enables.
Weitere Patentanmeldungen betreffen die thermische Entkopplung zwischen Regel- und Heizwendel, wodurch die Funktion von Glühkerzen weiter verbessert werden soll. Ein Beispiel hierfür sind Glühkerzen gemäß DE-PS 28 02 625. Diese Glühkerze weist ein Glührohr auf, in dem im Spitzenbereich eine Heizwendel und im anschlußseitigen Bereich eine Regelwendel in einem elektrisch isolierenden Stoff angeordnet ist.Other patent applications concern thermal decoupling between control and heating filament, whereby the function of Glow plugs should be further improved. An example of this are glow plugs according to DE-PS 28 02 625. This glow plug has a Glow tube on, in which a heating coil in the tip area and in connection-side area a control coil in an electrical insulating material is arranged.
Die aus dem Stand der Technik bekannten Glühkerzen dieser Gattung weisen den Nachteil auf, daß sie bei Dauerglühen bzw. längerem Glühen im laufenden Motor, das zu umweltverträglicheren Abgasen führt, zu geringe Standfestigkeit aufweisen, um den üblichen Anforderungen an die Standfestigkeit von Glühkerzen zu genügen.The glow plugs known from the prior art Genus have the disadvantage that in the case of continuous annealing or prolonged glow in the running engine, which leads to more environmentally friendly Exhaust gas leads to low stability to the usual requirements for the stability of glow plugs are enough.
Aufgabe der Erfindung ist es, unter Umgehung der im Stand
der Technik aufgezeigten Nachteile eine Glühkerze zur Verfügung
zu stellen, die hohe Standfestigkeit auch bei längerem Nachglühen
aufweist; gleichzeitig soll die bisher erreichbare Vorglühzeit
praktisch eingehalten werden, sowie eine Massenproduktion
in gewohnter Weise und wirtschaftlich wie bisher erfolgen können.
Diese Aufgabe wird durch die Glühkerze gemäß Anspruch 1
gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben
sich aus den nachfolgenden Ansprüchen 2 bis 11.The object of the invention is to circumvent the in the state
the disadvantages shown in the art, a glow plug is available
to provide the high stability even after prolonged afterglow
having; at the same time, the preheat time that can be achieved so far
are practically adhered to, as well as mass production
can be done in the usual way and economically as before.
This object is achieved by the glow plug according to claim 1
solved. Further advantageous embodiments of the invention result
result from the following
Intensive Untersuchungen haben gezeigt, daß Veränderungen an dem System Heizwendel/Regelwendel, insbesondere auch die vorgeschlagene thermische Entkopplung von Heiz- und Regelwendel nicht zu dem gewünschten Erfolg führen. Vielmehr wurde gefunden, daß ein möglicher Grund für die geringere Standfestigkeit der vorbekannten Glühkerzen darin zu sehen ist, daß die Temperaturverteilung über den Regelwiderstand ungleichmäßig ist, so daß sich örtliche Überhitzungen bilden, an denen sich zusätzlicher Energieumsatz konzentriert, wodurch eine weitere Temperaturerhöhung erfolgt und zu erhöhtem Verschleiß bzw. zum Abbrennen des Regel-Widerstands führt. Eine erfindungsgemäße Ursache dafür wurde in dem Umstand gefunden, daß im Bereich der Regelwendel, der am Innenpol der Glühkerze angeschlossen ist, der Innenpol diesen Bereich kühlt. Hierdurch entsteht nicht nur eine ungleichmäßige Temperaturverteilung über die Regelwendel; hinzu kommt, daß der kühlere Bereich niedrigohmiger bleibt und zur Abregelung des Glühkerzenstroms weniger beiträgt, als theoretisch bei "ungestörtem" Erwärmen dieses Regelwendelbereichs erfolgen würde.Intensive research has shown changes on the heating coil / control coil system, especially the Proposed thermal decoupling of the heating and control coil do not lead to the desired success. Rather, it was found that a possible reason for the lower stability of the previously known glow plugs can be seen in that the temperature distribution is uneven across the rheostat, so that local overheating forms, on which additional Energy turnover is concentrated, causing a further temperature increase takes place and to increased wear or to burn off the Control resistance leads. A cause for this according to the invention was found in the fact that in the area of the control coil, which is connected to the inner pole of the glow plug, the inner pole cools this area. This not only creates an uneven Temperature distribution via the control coil; added comes that the cooler area remains low impedance and Reduction of the glow plug current contributes less than theoretically with "undisturbed" heating of this control spiral area would be done.
Die Lösung der erfindungsgemäßen Aufgabe wird demnach darin gesehen, das System Innenpol/Übergang Innenpol-Regelwendel/Regelwendel derart zu gestalten, daß der nachteilige Kühleffekt durch den Innenpol minimiert wird, wobei gleichzeitig die anderen oben aufgeführten Anforderungen an eine Glühkerze erfüllt sein müssen, und wobei die übliche Geometrie von Glührohren bezüglich beispielsweise der Glührohrlänge, Länge und Geometrie der im Glührohr unterzubringenden Heiz- und Regelwendel usw. berücksichtigt werden muß.The solution to the problem according to the invention is accordingly therein seen the system inner pole / transition inner pole control spiral / control spiral to be designed in such a way that the disadvantageous cooling effect is minimized by the inner pole, while the others above requirements for a glow plug are met must be, and being the usual geometry of glow tubes regarding, for example, the glow tube length, length and geometry the heating and control coil etc. to be accommodated in the glow tube must be taken into account.
Demgemäß stellt die vorliegende Erfindung eine Glühkerze mit einem Glührohr zur Verfügung, in dem in der Spitze ein Heizelement angeordnet ist, dem ein Regelelement vorgeschaltet ist, das ebenfalls in dem Glührohr angeordnet ist, wobei das Regelelement aus einem stromleitenden Material mit positiven Temperatur-Widerstandskoeffizienten besteht, und wobei der Innenpol der Glühkerze mit dem Regelelement, das Regelelement mit dem Heizelement und das Heizelement mit der Glührohrspitze in Reihe verbunden sind, dadurch gekennzeichnet, daß zur Minimierung des Wärmeübergangs zwischen Regelelement und Innenpol der Wendelbereich einen Windungsdurchmesser aufweist, der kleiner als der halbe Durchmesser der Windungen der Regelwendel ist.Accordingly, the present invention provides a glow plug a glow tube is available, in which a heating element in the tip is arranged upstream of which a control element is, which is also arranged in the glow tube, the Control element made of a conductive material with positive Temperature resistance coefficient exists, and where the Inner pole of the glow plug with the control element, the control element with the heating element and the heating element with the glow tube tip are connected in series, characterized in that that to minimize heat transfer between the control element and the inner pole of the helical region has a winding diameter has less than half the diameter of the turns is the rule spiral.
Die Erfindung wird anhand der folgenden Figuren näher erläutert.
Der Heizstab gemäß Fig. 1 besteht in an sich bekannter
Weise aus dem Rohr 7, in dem die Heizwendel 1, die Regelwendel
2, der Innenpol 4 und der Abdichtring (O - Ring) in elektrisch
isolierendem Material (z.B. MgO) angeordnet sind. Die erfindungsgemäße
Entkopplung zwischen dem eigentlichen Regelwendelbereich
2 (mit Windungen größeren Durchmessers) und dem Innenpol 4
erfolgt über den Wendelbereich 3 (mit kleinerem Windungsdurchmesser).1 is known per se
Way from the
Die Drahtlänge des Bereiches 3 entspricht bevorzugt etwa 1/10 bis
etwa 1/20 der gesamten Drahtlänge des Regelwiderstands bei Raumtemperatur.
Bevorzugt ist die Länge dieses Teils größer als etwa
2,5 bis 4 mm, insbesonders bevorzugt weist es mindestens vier
Windungen auf.The wire length of
Der Windungsdurchmesser im Bereich 3 sollte als untere
Begrenzung etwa der vierfachen Regeldrahtstärke entsprechen.The winding diameter in
Die Steigung dieses Teils 3 ist gleich oder größer der
doppelten Drahtstärke. The slope of this
Die Abbildung zeigt den Regelwendelbereich 2 (mit größerem Durchmesser) einstückig. Tatsächlich kann er jedoch auch zwei- oder mehrstückig ausgebildet sein, wobei die Unterbereiche jeweils aus verschiedenen Legierungen mit unterschiedlichen Temperatur-Widerstands-Koeffizienten bestehen können.The illustration shows the control spiral area 2 (with a larger one Diameter) in one piece. In fact, it can or be formed in several pieces, the sub-areas in each case made of different alloys with different temperature resistance coefficients can exist.
Die erfindungsgemäße Lösung ist besonders vorteilhaft in dem Fall, in dem Regelwendeln mit hohen Temperatur-Widerstands-Koeffizienten verwendet werden, bei denen beispielsweise das Widerstandsverhältnis des Widerstandes bei 20° C/1.000° C größer als etwa 7,5 ist (bei >12 wird es extrem kritisch); insbesondere gilt dieses auch für Regelwendeln aus Materialien, die nicht einen kontinuierlichen sondern einen sprunghaften Anstieg des Widerstands aufweisen, wie es beispielsweise in den Anmeldungen DE-A-38 25 013 und 39 23 582 beschrieben wird. Unter diesen Umständen sind die erfindungsgemäßen Glühkerzen bei Dauerglühen bzw. längerem Glühen im laufenden Motor besonders geeignet.The solution according to the invention is particularly advantageous in the case where control coils with high temperature-resistance coefficients are used, for example where Resistance ratio of resistance greater at 20 ° C / 1,000 ° C than about 7.5 (at> 12 it becomes extremely critical); especially This also applies to control coils made of materials that are not a continuous but a sudden increase in the Have resistance, such as in the applications DE-A-38 25 013 and 39 23 582 is described. Under these Circumstances of the glow plugs according to the invention are permanent or longer glow in the running engine is particularly suitable.
Die Ausführungsform gemäß Fig. 1 weist einen üblichen Innenpol
4 auf. Besonders bevorzugt ist dieser Innenpol 4 aus
einem den Strom leitenden, schlecht wärmeleitenden Material
hergestellt. Als Beispiel sei ein Stahl mit höherem Cr-Ni-Anteil
genannt, der wie auch andere dem Durchschnittsfachmann auf dem
Legierungsgebiet leicht zugänglich ist. Da er zusätzlich durch
seine Zusammensetzung rostgeschützt ist, braucht der Kabelanschluß
(M5-, M4-Gewinde) nicht, wie oft gefordert wird, mit
Rostschutz versehen werden. Als eine besondere Ausführungsform
der Erfindung, die nicht abgebildet ist, besteht demnach der
Innenpol aus einem den Strom leitenden und die Wärme schlecht
leitendem Material. Bei dieser speziellen Ausführungsform kann
auf den Zwischenbereich 3 verzichtet werden (bzw. mit Zwischenbereich
3 zusammen ist Wärmeabführung noch weiter verringerbar).The embodiment according to FIG. 1 has a conventional
Fig. 2 zeigt eine erfindungsgemäße Glühkerzenausführung, in
der der Glühkerzenstift gemäß Fig. 1 eingebaut ist. Hierbei sind
der Übergangsbereich 3 und der Innenpol 4 durch einen an sich
bekannten "Steckanschluß" 8 mit zusätzlicher Verstemmung miteinander
verbunden.Fig. 2 shows a glow plug design according to the invention, in
which the glow plug pin according to FIG. 1 is installed. Here are
the
Bei dieser Ausführungsform wird deutlich, daß die Regelwendel(n)
2 sich praktisch über ganze Länge auf gleiche Temperatur
aufheizen kann, und daß weder die axial rückfließende Wärme
aus dem Bereich der Heizwendel 7 noch die sich radial von der/den
Regelwendel(n) ausbreitende Wärme zum Glührohr ungleichförmig
abgezogen und die Wärmeabführung zum Innenpol ausreichend
stark behindert wird.In this embodiment it is clear that the control coil (s)
2 are practically the same temperature over their entire length
can heat up, and that neither the axially refluxing heat
from the area of the
Der Übergangsbereich 3 ist bei der Standardausführung der
Erfindung einstückig und aus dem gleichen Material ausgebildet
wie der benachbarte Regelwendelbereich 2. Gemäß erfinderischer
Konzeption kann jedoch dieser Bereich 3 auch aus einem anderen
Material bestehen, als das des sich anschließenden Bereichs der
Regelwendel 2, wobei das Material dieses Bereiches 3 dann zwar
Stromleitfähigkeit, jedoch geringe Wärmeleitfähigkeit aufweisen
soll; derartiges Material und Legierungen sind an sich bekannt
und können beispielsweise auch die Materialien sein, die zuvor
bezüglich des Innenpols beschrieben wurden, wenn dieser geringe
Wärmeleitfähigkeit aufweist.The
Bei einer erfindungsgemäßen Ausführungsform beträgt der
Glührohrdurchmesser etwa 6 mm; der Durchmesser der Regelwendel 2
beträgt etwa 3,8 mm und der Durchmesser des Übergangsbereiches 3
etwa 1,8 mm bei einer Regeldrahtstärke von etwa 0,35 mm. Die
Länge des Regeldrahtes insgesamt beträgt 200 bis 220 mm, wobei
die Länge des Regeldrahtes im Bereich 3 etwa 12 mm beträgt.In one embodiment according to the invention, the
Glow tube diameter about 6 mm; the diameter of the
Die erfindungsgemäße Lösung führt zu dem überraschenden Ergebnis, daß die Maximaltemperatur der Glühstiftspitze bzw. der Heizwendel selbst, bei der das Abregeln einsetzt, erniedrigt wird, so daß einerseits die Vorglühzeit praktisch nicht vermindert, die Lebensdauer unter Nachglühbedingungen jedoch deutlich erhöht wird. The solution according to the invention leads to the surprising Result that the maximum temperature of the glow pencil tip or Heating coil itself, in which the regulation begins, is lowered is so that on the one hand the preheating time is practically not reduced, the service life under afterglow conditions, however, is clear is increased.
- 11
- HeizwendelHeating coil
- 22nd
- Regelwendel(n)Rule spiral (s)
- 33rd
- ÜbergangsteilTransition part
- 44th
- InnenpolInner pole
- 55
- O-RingO-ring
- 66
- Isoliermaterialinsulating material
- 77
- GlührohrGlow tube
- 88th
- Steckanschluß (Verbindung Innenpol-Regelwendel)Plug connection (connection inner pole control coil)
Claims (11)
- Heater plug having a hot tube (7) in the tip of which is arranged a heating element (1) in advance of which a regulating element (2) is arranged, the regulating element likewise being arranged in the hot tube (7), wherein the regulating element (2) consists of an electrically conductive material having a positive temperature coefficient of resistance, and wherein an internal pole (4) of the heater plug is connected in series with the regulating element (2), the regulating element (2) is connected in series with the heating element (1) and the heating element (1) is connected in series with the hot tube tip, characterised in that, to minimise the transfer of heat between regulating element (2) and internal pole (4), a coil region (3) has a turns diameter that is smaller than half the diameter of the turns of the regulating element (2).
- Heater plug according to claim 1, characterised in that the wire length of the region (3) corresponds to approximately 1/10 to 1/20 of the total wire length of the regulating resistor at room temperature.
- Heater plug according to claim 1 and/or 2, characterised in that the coiled region (3) is longer than 2.5 to 4 mm.
- Heater plug according to one of the preceding claims, characterised in that the tums diameter of the region (3) is the same as or greater than four times the wire thickness of the regulating coil (2).
- Heater plug according to one of the preceding claims, characterised in that the internal pole (4) consists of an electrically conductive material of poor thermal conduction.
- Heater plug according to one of the preceding claims, characterised in that an electrically conductive material of poor thermal conduction in wire or rod form is arranged between the internal pole (4) and the regulating coil (2).
- Heater plug according to one of the preceding claims, characterised in that the regulating coil (2) and regulating coil region (3) are of integral construction.
- Heater plug according to one of the preceding claims, characterised in that the regulating coil (2) is constructed in at least two parts, the individual parts of the regulating coil (2) consisting of different alloys having different temperature coefficients of resistance.
- Heater plug according to claim 8, characterised in that a material which is used for the regulating coil (2) or a part of the regulating coil (2) is formed of a resistive material and has a ratio of resistance at 20°C/1,000°C greater than about 7.5.
- Heater plug according to claim 9, characterised in that a material in which is used for the regulating coil (2) or a part of the regulating coil (2) is formed of a resistive material and has a ratio of resistance at 20°C/1,000°C equal to12.
- Heater plug according to claim 9 or 10, characterised in that the regulating coil consists of a cobalt/iron alloy having an iron content of 20 to 35 % by weight, the remainder cobalt and, optionally, nickel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4133338A DE4133338A1 (en) | 1991-10-08 | 1991-10-08 | GLOW PLUG |
| DE4133338 | 1991-10-08 | ||
| PCT/EP1992/002318 WO1993007423A1 (en) | 1991-10-08 | 1992-10-08 | Glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0560966A1 EP0560966A1 (en) | 1993-09-22 |
| EP0560966B1 true EP0560966B1 (en) | 1998-07-08 |
Family
ID=6442278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92921112A Expired - Lifetime EP0560966B1 (en) | 1991-10-08 | 1992-10-08 | Glow plug |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5521356A (en) |
| EP (1) | EP0560966B1 (en) |
| JP (1) | JP3243253B2 (en) |
| DE (2) | DE4133338A1 (en) |
| ES (1) | ES2118830T3 (en) |
| WO (1) | WO1993007423A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4334771C2 (en) * | 1993-10-12 | 1996-03-28 | Beru Werk Ruprecht Gmbh Co A | Glow plug |
| US6037568A (en) * | 1996-01-18 | 2000-03-14 | Jidosha Kiki Co., Ltd. | Glow plug for diesel engine with ptc control element disposed in small-diameter sheath section and connected to the distal end thereof |
| DE19630402C2 (en) * | 1996-07-26 | 2000-12-28 | Beru Ag | Pole flame glow plug |
| DE19755822A1 (en) * | 1997-12-16 | 1999-06-24 | Bosch Gmbh Robert | Glow plug |
| DE19833862A1 (en) * | 1998-07-28 | 2000-02-03 | Bosch Gmbh Robert | Heating element used for long plate type or lambda probes for measuring oxygen concentration in the exhaust gas of combustion engines |
| DE10041289B4 (en) * | 2000-08-22 | 2005-05-04 | Beru Ag | glow plug |
| DE10117641C2 (en) * | 2001-04-09 | 2003-02-27 | Beru Ag | glow plug |
| JP2002367760A (en) * | 2001-06-11 | 2002-12-20 | Ngk Spark Plug Co Ltd | Heater and glow plug |
| DE10248802A1 (en) * | 2002-10-19 | 2004-04-29 | Robert Bosch Gmbh | Glow plug with greatly shortened control coil |
| US6878903B2 (en) * | 2003-04-16 | 2005-04-12 | Fleming Circle Associates, Llc | Glow plug |
| US7332690B2 (en) * | 2003-09-05 | 2008-02-19 | Channel Products, Inc. | Hot wire igniter |
| JP4510588B2 (en) * | 2004-10-29 | 2010-07-28 | 日本特殊陶業株式会社 | Glow plug |
| GB0428297D0 (en) * | 2004-12-24 | 2005-01-26 | Heat Trace Ltd | Control of heating cable |
| DE102008015402B3 (en) * | 2008-03-22 | 2009-10-22 | Beru Ag | Glow plug for diesel engine, has regulating coil and heating coil adjacent to regulating coil, where regulating coil has two sections between which third section is provided |
| US8022337B2 (en) * | 2008-06-10 | 2011-09-20 | Locust, Usa, Inc. | Ignitor plug assembly |
| JP5584370B2 (en) * | 2012-04-16 | 2014-09-03 | 日本特殊陶業株式会社 | Glow plug |
| JP6279925B2 (en) * | 2014-02-14 | 2018-02-14 | 日本特殊陶業株式会社 | Glow plug |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2802625C3 (en) * | 1978-01-21 | 1985-07-18 | BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg | Glow plug |
| IT1175444B (en) * | 1984-03-09 | 1987-07-01 | Magneti Marelli Spa | SPARK PLUG FOR DIESEL ENGINES FOR VEHICLES |
| DE3502525C2 (en) * | 1985-01-25 | 1993-11-11 | Beru Werk Ruprecht Gmbh Co A | Glow element |
| JPS6217520A (en) * | 1985-07-15 | 1987-01-26 | Ngk Spark Plug Co Ltd | Self-control type glow plug |
| GB2220446B (en) * | 1988-04-06 | 1992-05-27 | Champion Spark Plug Europ | Glow plug for internal combustion engine |
| DE3825013A1 (en) * | 1988-07-22 | 1990-01-25 | Beru Werk Ruprecht Gmbh Co A | Heater plug |
| JP2745225B2 (en) * | 1989-02-15 | 1998-04-28 | 自動車機器株式会社 | Glow plug for diesel engine |
| DE3911831A1 (en) * | 1989-04-11 | 1990-10-18 | Bosch Gmbh Robert | Glow-plug for Diesel engine - has heating coil threaded into hollow end of contact shaft and embedded in insulating powder |
| JPH0814376B2 (en) * | 1989-09-11 | 1996-02-14 | 自動車機器株式会社 | Self temperature control glow plug |
| JPH03175210A (en) * | 1989-09-11 | 1991-07-30 | Jidosha Kiki Co Ltd | Glow plug of ceramic heater type |
| DE4014356A1 (en) * | 1990-05-04 | 1991-11-07 | Beru Werk Ruprecht Gmbh Co A | GLOW PLUG |
| JPH04143518A (en) * | 1990-10-04 | 1992-05-18 | Ngk Spark Plug Co Ltd | Self-regulative type ceramic glow plug |
| DE9112507U1 (en) * | 1991-10-08 | 1992-03-26 | BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg | Glow plug |
-
1991
- 1991-10-08 DE DE4133338A patent/DE4133338A1/en not_active Withdrawn
-
1992
- 1992-10-08 JP JP50662793A patent/JP3243253B2/en not_active Expired - Lifetime
- 1992-10-08 ES ES92921112T patent/ES2118830T3/en not_active Expired - Lifetime
- 1992-10-08 US US08/070,380 patent/US5521356A/en not_active Expired - Lifetime
- 1992-10-08 EP EP92921112A patent/EP0560966B1/en not_active Expired - Lifetime
- 1992-10-08 WO PCT/EP1992/002318 patent/WO1993007423A1/en active IP Right Grant
- 1992-10-08 DE DE59209406T patent/DE59209406D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5521356A (en) | 1996-05-28 |
| DE59209406D1 (en) | 1998-08-13 |
| JPH06503411A (en) | 1994-04-14 |
| ES2118830T3 (en) | 1998-10-01 |
| WO1993007423A1 (en) | 1993-04-15 |
| DE4133338A1 (en) | 1993-04-15 |
| JP3243253B2 (en) | 2002-01-07 |
| EP0560966A1 (en) | 1993-09-22 |
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