EP1005126B1 - Spark plug - Google Patents
Spark plug Download PDFInfo
- Publication number
- EP1005126B1 EP1005126B1 EP99117056A EP99117056A EP1005126B1 EP 1005126 B1 EP1005126 B1 EP 1005126B1 EP 99117056 A EP99117056 A EP 99117056A EP 99117056 A EP99117056 A EP 99117056A EP 1005126 B1 EP1005126 B1 EP 1005126B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- central electrode
- composite material
- section
- electrode
- ignition
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
Definitions
- the invention relates in particular to electrodes for ignition systems Spark plugs for high voltage ignitions at various Applications particularly in the ignition of internal combustion engines and spark plugs with such electrodes.
- Known center electrodes are e.g. from a coat made of nickel alloy and a core of copper metal. This Center electrodes have a lifespan of approximately 60,000 km designed. If this lifetime is to be extended, the Center electrode on the ignition surface, for example with precious metal be provided; the center electrode can also be solid from, for example, silver, silver-nickel fiber composite or the like. be executed.
- the object on which the invention is based is in contrast in that the precious metal reinforcement with a lower Manufacturing effort.
- this object is achieved by that at least on the ignition side, the electrode made of a composite material in doublé-bar-shaped or doublé-tube-section-shaped Training are made, the coat made of precious metal and the core in the form of a double bar section Training or the inner layer in the case of a double tube section Training consist of base metal.
- Electrodes are the subject of claims 2 and 3.
- a spark plug with at least one electrode according to the invention as well as particularly preferred embodiments of such Spark plugs are the subject of claims 4 to 7.
- the electrodes according to the invention and preferably from them Manufactured spark plugs show in terms of their manufacture and function have considerable advantages over the prior art on. For example, side electrode concepts are simple realizable; the previously difficult precious metal reinforcement the electrodes are omitted with the consequence of the simple Production of the center electrodes according to the invention; the Weldability of the material combinations used according to the invention is caused, for example, by the impact of nickel Nickel simplified.
- a center electrode which is made in one piece from a rod section or Sheathed wire with a sheath (2) made of precious metal such as platinum, a platinum alloy, Silver Palladium u. ⁇ .and a good heat-conducting core (1) made of oxidation-resistant Material, such as nickel or nickel alloy.
- the Diameter A of the electrode is preferably ⁇ 2 mm, preferably ⁇ 1.5 mm.
- the center electrode body consists of a standard center electrode body with a diameter of 2.0 to 3 mm with nickel jacket (3) and Copper core (4).
- the rod section-shaped composite material is on the ignition side of this body welded from nickel jacket (5) and platinum core (6).
- the sheathed wire section has a much smaller diameter (about 1.0 mm) than that conventional center electrode body with a diameter of 2.0 to 3 mm.
- FIG. 2a Another embodiment is shown in FIG. 2a; here is on the same known center electrode body in the front ignition area the sheathed wire section made of the composite material with the same Diameter dimensioning attached.
- the sheathed wire consists of the Precious metal jacket (7), for example made of platinum or silver-palladium, during the Core (8) is formed from an oxidation-resistant, good heat-conducting material.
- FIG. 3 Another embodiment of the invention is shown in FIG. 3.
- a conventional nickel jacket / copper core center electrode body formed an enlarged diameter, here the known per se Center electrode body in the ignition-side area at least partially annular from the Composite material in the form of a doublé pipe section is included; the coat (9) this doublé pipe section consists of precious metal and the inside (10) oxidation resistant material.
- Fig. 4 shows in partial cross section the ignition-side area of a spark plug with side electrodes again.
- the center electrode is designed according to FIG. 2a;
- the jacket (13) of the composite material which is in the form of a rod section exists here again made of precious metal.
- the welding on the usual center electrode body does not cause any difficulties, especially if the core (13a) of the attachment the same material, for example nickel, as the adjacent material of the Center electrode body is made.
- Fig. 5 gives a spark gap with a ring electrode made of double tube section with precious metal (14) as the inner area and oxidation-resistant material (15) as outer area.
- the opposite center electrode is also on the ignition side a doublé pipe section according to FIG. 3; the outer surface (16) here made of precious metal.
- FIG. 7 shows a spark plug with a spark gap arrangement as a sliding / air spark gap.
- the center electrode is preferably as in FIG Figure 2a described used.
- the center electrode consists of at the ignition end a sheathed wire section with a noble metal sheath, e.g. Platinum and has a core of oxidation-resistant, good heat-conducting core, e.g. Nickel.
- the sheathed wire section is on a conventional center electrode, consisting of a jacket made of a Nickel alloy and a copper core applied.
- the center electrode is on the ignition-side end is protected from wear by the burn-resistant precious metal jacket, so that long engine running times can be reliably achieved with this spark plug.
- the Body electrode can be positioned below the insulator tip as shown in position 17 be positioned, or as shown in position 18 with the lower edge of the body electrode and the insulator tip are on the same level to prevent wear of the ceramic counteract.
- Several 2, 3 or 4 side electrodes are conceivable, including one A combination of two pairs of electrodes of different heights is possible.
Landscapes
- Spark Plugs (AREA)
Abstract
Description
Die Erfindung betrifft Elektroden für Zündsysteme insbesondere Zündkerzen für Hochspannungszündungen bei verschiedenen Anwendungen insbesondere bei der Zündung von Verbrennungsmotoren sowie Zündkerzen mit derartigen Elektroden.The invention relates in particular to electrodes for ignition systems Spark plugs for high voltage ignitions at various Applications particularly in the ignition of internal combustion engines and spark plugs with such electrodes.
Aus DE-A-19705372 das als nächstliegender Stand der Technik angesehen wird, ist bereits eine Elektrode für Hochspannungszündvorrichtungen bekannt, die aus einer Nickellegierung mit einem Kern aus Kupfermetall besteht, wobei die Zündflächen mit Edelmetall armiert sind. Die Edelmetallarmierung wird in Form von Buchsen oder Hülsen durch Vorfertigung und Fixierung derselben im zündseitigen Bereich der Elektrode beispielsweise einer Mittelelektrode durchgeführt.From DE-A-19705372, which is considered to be the closest prior art, is already an electrode for high-voltage ignition devices known from a nickel alloy with a core made of copper metal, the ignition surfaces are armored with precious metal. The precious metal reinforcement is in Form of bushings or sleeves through prefabrication and fixation the same in the ignition-side area of the electrode, for example carried out a center electrode.
Bekannte Mittelelektroden bestehen z.B. aus einem Mantel aus Nickellegierung und einem Kern aus Kupfermetall. Diese Mittelelektroden sind auf eine Lebensdauer von etwa 60.000 km ausgelegt. Soll diese Lebenszeit verlängert werden, muss die Mittelelektrode an der Zündfläche beispielsweise mit Edelmetall versehen werden; die Mittelelektrode kann aber auch massiv aus beispielsweise Silber, Silber-Nickel-Faserverbund o. ä. ausgeführt sein.Known center electrodes are e.g. from a coat made of nickel alloy and a core of copper metal. This Center electrodes have a lifespan of approximately 60,000 km designed. If this lifetime is to be extended, the Center electrode on the ignition surface, for example with precious metal be provided; the center electrode can also be solid from, for example, silver, silver-nickel fiber composite or the like. be executed.
Bei Zündkerzen mit Seitenelektroden muss die Außenfläche der Mittelelektrode aus gleichen Gründen mit Edelmetall versehen werden; diese Edelmetallarmierungen erfordern einen hohen Fertigungsaufwand.In the case of spark plugs with side electrodes, the outer surface the center electrode with noble metal for the same reasons become; these precious metal reinforcements require a high level Production expense.
Hinzu kommt, dass bei Mittelelektroden mit Durchmessern von 2 mm und kleiner dieser Aufwand noch wesentlich höher ist, was wiederum einer wirtschaftlichen, insbesondere automatisierten Herstellung äußerst abträglich ist.Added to this is that with center electrodes with diameters of 2 mm and less this effort is much higher, which in turn is economical, especially automated Manufacturing is extremely detrimental.
Die der Erfindung zugrundeliegende Aufgabe besteht demgegenüber darin, die Edelmetallarmierung mit einem geringeren Aufwand herzustellen.The object on which the invention is based is in contrast in that the precious metal reinforcement with a lower Manufacturing effort.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, dass zumindest zündseitig die Elektrode aus einem Verbundwerkstoff in doublé-stababschnittförmiger oder doublé-rohrabschnittsförmiger Ausbildung hergestellt sind, wobei der Mantel aus Edelmetall und der Kern bei doublé-stababschnittsförmiger Ausbildung beziehungsweise die innere Schicht bei doublérohrabschnittsförmiger Ausbildung aus unedlem Metall bestehen.According to the invention, this object is achieved by that at least on the ignition side, the electrode made of a composite material in doublé-bar-shaped or doublé-tube-section-shaped Training are made, the coat made of precious metal and the core in the form of a double bar section Training or the inner layer in the case of a double tube section Training consist of base metal.
Besonders bevorzugte Ausgestaltungen der erfindungsgemäßen
Elektroden sind Gegenstand der Ansprüche 2 und 3.Particularly preferred embodiments of the invention
Electrodes are the subject of
Eine Zündkerze mit zumindest einer erfindungsgemäßen Elektrode sowie besonders bevorzugte Ausgestaltungen einer derartigen Zündkerze sind Gegenstand der Ansprüche 4 bis 7.A spark plug with at least one electrode according to the invention as well as particularly preferred embodiments of such Spark plugs are the subject of claims 4 to 7.
Die erfindungsgemäßen Elektroden und die vorzugsweise daraus gefertigten Zündkerzen weisen bezüglich ihrer Herstellung und Funktion erhebliche Vorteile gegenüber dem Stand der Technik auf. So werden beispielsweise in einfacher Weise Seitenelektroden-Konzepte realisierbar; die bisher schwierige Edelmetallarmierung der Elektroden entfällt mit der Folge der einfachen Herstellung der erfindungsgemäßen Mittelelektroden; die Schweißbarkeit der erfindungsgemäß verwendeten Werkstoffkombinationen wird durch beispielsweises Auftreffen von Nickel auf Nickel vereinfacht.The electrodes according to the invention and preferably from them Manufactured spark plugs show in terms of their manufacture and function have considerable advantages over the prior art on. For example, side electrode concepts are simple realizable; the previously difficult precious metal reinforcement the electrodes are omitted with the consequence of the simple Production of the center electrodes according to the invention; the Weldability of the material combinations used according to the invention is caused, for example, by the impact of nickel Nickel simplified.
Neben der Einsparung von Edelmetallen im Verhältnis zu
Massivelektroden tritt eine deutliche Steigerung der Lebensdauer
der aus den erfindungsgemäßen Elektroden gefertigten
Zündkerzen auf. Besonders vorteilhaft ist das erfindungsgemäße
Konzept bei Herstellung und Einsatz von dünnen Mittelelektroden
(Quenching) oder die Ausbildung von dicken Mittelektroden
durch die Verwendung von Edelmetall-Double-Rohrabschnitten,
was der Vergrößerung der Abbrandfläche dient. Weitere Vorteile
ergeben sich aus der nachfolgenden Beschreibung bevorzugter
Ausführungsformen.
Fig. 1 zeigt eine Mittelelektrode, die einstückig aus einem Stababschnitt bzw. Manteldraht mit einem Mantel (2) aus Edelmetall wie Platin, einer Platinlegierung, Silber- Palladium u. ä.und einem gut wärmeleitenden Kern (1) aus oxydationsbeständigen Werkstoff, beispielsweise Nickel oder Nickellegierung, besteht. Der Durchmesser A der Elektrode beträgt vorzugsweise < 2 mm vorzugsweise < 1,5 mm. Ein Vorteil besteht darin, daß die Mittelelektrode aus einem Manteldraht einfach durch Umformen herstellbar ist und sich mit bekannter Keramik-Metallverbindunastechnik mittels Glaseinschmelzverfahren montieren läßt.1 shows a center electrode which is made in one piece from a rod section or Sheathed wire with a sheath (2) made of precious metal such as platinum, a platinum alloy, Silver Palladium u. Ä.and a good heat-conducting core (1) made of oxidation-resistant Material, such as nickel or nickel alloy. The Diameter A of the electrode is preferably <2 mm, preferably <1.5 mm. One advantage is that the center electrode is made of a sheathed wire Forming can be produced using known ceramic-metal joining technology can be installed using the glass melting process.
Bei der in Fig. 2 dargestellen Mittelelektrode nach dem Stand der Technik besteht der Mittelelektrodenkörper aus einen serienmäßigen Mittelelektrodenkörper mit einem Durchmesser von 2,0 bis 3 mm mit Nickelmantel (3) und Kupferkern (4). An diesen Körper ist zündseitig der stababschnittsförmige Verbundwerkstoff aus Nickelmantel (5) und Platinkern (6) angeschweißt. Hierbei besitzt der Manteldrahtabschnitt einen wesentlich kleineren Durchmesser (etwa 1,0 mm) als der herkömmliche Mittelelektrodenkörper mit dem Durchmesser von 2,0 bis 3 mm.In the center electrode shown in FIG. 2 according to the prior art the center electrode body consists of a standard center electrode body with a diameter of 2.0 to 3 mm with nickel jacket (3) and Copper core (4). The rod section-shaped composite material is on the ignition side of this body welded from nickel jacket (5) and platinum core (6). Here owns the sheathed wire section has a much smaller diameter (about 1.0 mm) than that conventional center electrode body with a diameter of 2.0 to 3 mm.
Eine weitere Ausführungsform ist in der Figur 2a wiedergegeben; hier ist an dem gleichen an sich bekannten Mittelelektrodenkörper im stirnseitigen Zündspitzenbereich der Manteldrahtabschnitt aus dem Verbundwerkstoff mit der gleichen Durchmesserdimensionierung angebracht. Hierbei besteht der Manteldraht aus dem Edelmetallmantel (7), beispielsweise aus Platin oder Silber-Palladium, während der Kern (8) aus einem oxydationsbeständigen, gut wärmeleitenden Werkstoff gebildet ist.Another embodiment is shown in FIG. 2a; here is on the same known center electrode body in the front ignition area the sheathed wire section made of the composite material with the same Diameter dimensioning attached. Here, the sheathed wire consists of the Precious metal jacket (7), for example made of platinum or silver-palladium, during the Core (8) is formed from an oxidation-resistant, good heat-conducting material.
Eine andere erfindungsgemäße Ausführungsform stellt Fig. 3 dar. Hier ist der zündseitige Bereich eines üblichen Nickelmantel/Kuperkern-Mittelelektrodenkörpers mit einem vergrößerten Durchmesser ausgebildet, wobei hier der an sich bekannte Mittelelektrodenkörper im zündseitigen Bereich zumindest teilweise ringförmig von dem Verbundwerkstoff in Form eines Doublé-Rohrabschnitts umfaßt ist; der Mantel (9) dieses Doublé-Rohrabschnitts besteht aus Edelmetall und die Innenseite (10) aus oxydationsbeständigem Material. Auf diese Weise ist es möglich. Mittelelektroden im zündseitigen Bereich mit größeren Durchmessern, beispielsweise > 3 mm, in einfacher Weise herzustellen.Another embodiment of the invention is shown in FIG. 3. Here is the area on the ignition side of a conventional nickel jacket / copper core center electrode body formed an enlarged diameter, here the known per se Center electrode body in the ignition-side area at least partially annular from the Composite material in the form of a doublé pipe section is included; the coat (9) this doublé pipe section consists of precious metal and the inside (10) oxidation resistant material. This way it is possible. Center electrodes in the area on the ignition side with larger diameters, for example> 3 mm, in simpler Way to manufacture.
Fig. 4 gibt im teilweisen Querschnitt den zündseitigen Bereich einer Zündkerze mit Seitenelektroden wieder. Hierbei ist die Mittelelektrode gemäß Fig. 2a ausgebildet; der Mantel (13) des stababschnittsförmig ausgebildeten Verbundwerkstoffs besteht hier wiederum aus Edelmetall. Die Verschweißung auf dem üblichen Mittelelektrodenkörper bereitet keinerlei Schwierigkeiten, insbesondere wenn der Kern (13a) des Aufsatzes aus dem gleichen Material, beispielsweise Nickel, wie das anliegende Material des Mittelelektrodenkörpers besteht.Fig. 4 shows in partial cross section the ignition-side area of a spark plug with side electrodes again. Here, the center electrode is designed according to FIG. 2a; The jacket (13) of the composite material which is in the form of a rod section exists here again made of precious metal. The welding on the usual center electrode body does not cause any difficulties, especially if the core (13a) of the attachment the same material, for example nickel, as the adjacent material of the Center electrode body is made.
Fig. 5 gibt eine Funkenstrecke mit einer Ringelektrode aus Double-Rohrabschnitt mit Edelmetall (14) als innerem Bereich und oxydationsbeständigem Werkstoff (15) als äußerem Bereich. Die gegenüberliegende Mittelelektrode ist zündseitig ebenfalls mit einem Doublé-Rohrabschnitt gemäß Fig. 3 versehen; die Mantelfläche (16) besteht hierbei aus Edelmetall.Fig. 5 gives a spark gap with a ring electrode made of double tube section with precious metal (14) as the inner area and oxidation-resistant material (15) as outer area. The opposite center electrode is also on the ignition side a doublé pipe section according to FIG. 3; the outer surface (16) here made of precious metal.
Schließlich wird in Fig. 6 eine besonders bevorzugte Ausführungsform einer Zündkerze mit einer besonders dünnen Mittelelektrode aus dem stababschnittsförmigen Verbundwerkstoff mit einem Durchmesser A von < 1,2 mm wiedergegeben, die einstückig ausgebildet in dem Isolatorglas eingeschmolzen ist.Finally, a particularly preferred embodiment of a Spark plug with a particularly thin central electrode made of rod-shaped Composite material with a diameter A of <1.2 mm reproduced, the is integrally melted in the insulator glass.
Fig. 7 zeigt eine Zündkerze mit einer Funkenstreckenanordnung als Gleit/-Luftfunkenstrecke.
In dieser Anordnung ist vorzugsweise die Mittelelektrode wie in
Figur 2a beschrieben eingesetzt. Die Mittelelektrode besteht am zündseitigen Ende aus
einem Manteldrahtabschnitt mit Edelmetallmantel, z.B. Platin und hat einen Kern aus
oxidationsbeständigen, gut wärmeleitenden Kern, z.B. Nickel. Der Manteldrahtabschnitt
ist auf eine konventionelle Mittelelektrode, bestehend aus einem Mantel aus einer
Nickellegierung und einem Kupferkern aufgebracht. Die Mittelelektrode wird am
zündseitigen Ende durch den abbrandfesten Edelmetallmantel vor Verschleiß geschützt,
so daß mit dieser Zündkerze hohe Motorlaufzeiten sicher erreicht werden. Die
Körperelektrode kann wie in Position 17 dargestellt unterhalb der Isolatorfußspitze
positioniert sein, oder wie in Position 18 dargestellt mit der Unterkante der Körperelektrode
und der Isolatorfußspitze auf gleicher Ebene liegen, um Verschleiß der Keramik
entgegenzuwirken. Es sind mehrere 2, 3 oder 4 Seitenelektroden denkbar, auch eine
Kombination zweier Elektrodenpaare unterschiedlicher Höhe ist realisierbar.FIG. 7 shows a spark plug with a spark gap arrangement as a sliding / air spark gap.
In this arrangement, the center electrode is preferably as in FIG
Figure 2a described used. The center electrode consists of at the ignition end
a sheathed wire section with a noble metal sheath, e.g. Platinum and has a core of
oxidation-resistant, good heat-conducting core, e.g. Nickel. The sheathed wire section
is on a conventional center electrode, consisting of a jacket made of a
Nickel alloy and a copper core applied. The center electrode is on
the ignition-side end is protected from wear by the burn-resistant precious metal jacket,
so that long engine running times can be reliably achieved with this spark plug. The
Body electrode can be positioned below the insulator tip as shown in
Claims (7)
- Electrodes for ignition systems, in particular for spark plugs produced at least on the ignition side from a composite material in the form of a plated rod-shaped section or a plated tubular section, in which the shell consists of noble metal and, in the case of the plated rod-shaped section, the core or, in the case of the plated tubular section, the inner layer consists of base metal.
- Electrode according to claim 1, designed as a central electrode with diameters of 0.5 mm to 2 mm, in which the central electrode is formed in one piece from the composite material in the form of a rod-shaped section or in which the composite material in the form of a rod-shaped section is arranged on the end face of a copper-cored central electrode.
- Electrode according to claim 1, designed as a central electrode, the electrode diameter of which on the ignition side is greater than the diameter of the central electrode body, in which the composite material in the form of a plated tubular section at least partially embraces the end region of the central electrode body on the ignition side in an annular manner.
- Spark plug comprising at least one of the electrodes according to one of claims 1 to 3.
- Spark plug according to claim 4, comprising a central electrode, the electrode diameter of which on the ignition side is greater than that of the central electrode body, in which the composite material in the form of a plated tubular section at least partially embraces the end region of the central electrode body on the ignition side in an annular manner, the shell (16) consisting of noble metal and this central electrode being surrounded by an annular electrode formed from a plated tubular section, the inner region (14) of which is formed of noble metal and the outer region (15) of which is formed of oxidation-resistant material.
- Spark plug according to claim 4, comprising side electrodes, in which the central electrode body consists of a nickel shell and a copper core known per se, a rod section of the composite material is applied to the body on the ignition side by welding and the shell (13) consists of noble metal and the core (13a) consists of the same material, e.g. nickel, as the adjacent material of the central electrode body.
- Spark plug according to claim 4, in which the central electrode has a central electrode diameter of ≤ 1.2 mm, the composite material being in the form of a rod section of this diameter and being sealed in the insulator glass.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19854861A DE19854861A1 (en) | 1998-11-27 | 1998-11-27 | spark plug |
| DE19854861 | 1998-11-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1005126A1 EP1005126A1 (en) | 2000-05-31 |
| EP1005126B1 true EP1005126B1 (en) | 2004-08-11 |
Family
ID=7889288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99117056A Expired - Lifetime EP1005126B1 (en) | 1998-11-27 | 1999-08-30 | Spark plug |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1005126B1 (en) |
| AT (1) | ATE273579T1 (en) |
| DE (2) | DE19854861A1 (en) |
| ES (1) | ES2222642T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004033880A1 (en) * | 2004-07-13 | 2006-02-09 | Beru Ag | Spark plug for internal combustion engine has reinforcing layer consists of a ring or tubular element on the top of central electrode in insulator |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10156949B4 (en) * | 2001-11-20 | 2004-03-04 | Robert Bosch Gmbh | spark plug |
| DE202004006644U1 (en) * | 2004-04-27 | 2004-08-26 | Buderus Heiztechnik Gmbh | electrode |
| DE102013109612A1 (en) * | 2013-09-03 | 2014-09-25 | Federal-Mogul Ignition Gmbh | spark plug |
| US9948069B2 (en) | 2013-12-20 | 2018-04-17 | Ngk Spark Plug Co., Ltd. | Spark plug |
| DE102014226107A1 (en) * | 2014-12-16 | 2016-06-16 | Robert Bosch Gmbh | Spark plugs with center electrode |
| US10923887B2 (en) * | 2017-03-15 | 2021-02-16 | Tenneco Inc. | Wire for an ignition coil assembly, ignition coil assembly, and methods of manufacturing the wire and ignition coil assembly |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3452235A (en) * | 1966-08-17 | 1969-06-24 | Ford Motor Co | Spark plug having a short tip center electrode |
| DE2614274C3 (en) * | 1976-04-02 | 1980-06-19 | Beru-Werk Albert Ruprecht Gmbh & Co Kg, 7140 Ludwigsburg | High voltage spark plug |
| JPS59160988A (en) * | 1983-03-02 | 1984-09-11 | 日本特殊陶業株式会社 | Spark plug |
| DE8902032U1 (en) * | 1989-02-21 | 1989-05-18 | Jenbacher Werke AG, Jenbach, Tirol | spark plug |
| JPH03101086A (en) * | 1989-09-14 | 1991-04-25 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
| JP3301094B2 (en) * | 1991-12-13 | 2002-07-15 | 株式会社デンソー | Spark plug for internal combustion engine and method of manufacturing the same |
| DE4431143B4 (en) * | 1994-09-01 | 2004-09-23 | Robert Bosch Gmbh | Spark plug for an internal combustion engine |
| JP3692555B2 (en) * | 1994-12-16 | 2005-09-07 | 株式会社デンソー | Spark plug for internal combustion engine |
| JP4255519B2 (en) * | 1995-06-12 | 2009-04-15 | 株式会社デンソー | Spark plug for internal combustion engine and method for manufacturing the same |
| DE19705372C2 (en) * | 1997-02-12 | 2002-06-27 | Beru Werk Ruprecht Gmbh Co A | Spark plug for an internal combustion engine |
-
1998
- 1998-11-27 DE DE19854861A patent/DE19854861A1/en not_active Ceased
-
1999
- 1999-08-30 EP EP99117056A patent/EP1005126B1/en not_active Expired - Lifetime
- 1999-08-30 DE DE59910188T patent/DE59910188D1/en not_active Expired - Fee Related
- 1999-08-30 ES ES99117056T patent/ES2222642T3/en not_active Expired - Lifetime
- 1999-08-30 AT AT99117056T patent/ATE273579T1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004033880A1 (en) * | 2004-07-13 | 2006-02-09 | Beru Ag | Spark plug for internal combustion engine has reinforcing layer consists of a ring or tubular element on the top of central electrode in insulator |
| DE102004033880B4 (en) * | 2004-07-13 | 2009-12-31 | Beru Ag | Spark plug for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59910188D1 (en) | 2004-09-16 |
| ES2222642T3 (en) | 2005-02-01 |
| EP1005126A1 (en) | 2000-05-31 |
| DE19854861A1 (en) | 2000-05-31 |
| ATE273579T1 (en) | 2004-08-15 |
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