EP0401598A1 - Electrode centrale pour bougies d'allumage de moteurs à combustion interne - Google Patents

Electrode centrale pour bougies d'allumage de moteurs à combustion interne Download PDF

Info

Publication number: EP0401598A1
Authority: EP; European Patent Office
Prior art keywords: electrode according; separating layer; silver; center electrode; eutectic
Prior art date: 1989-06-05
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP90109777A

Other languages

German (de)

English (en)

Other versions

EP0401598B1 (fr

Inventor

Friedrich E. Dipl-Ing. Schneider

Peter Dr. Rer. Nat. Dipl.-Ing. Tautzenberger

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

G RAU GmbH and Co KG

Original Assignee

G RAU GmbH and Co KG

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1989-06-05

Filing date

1990-05-23

Publication date

1990-12-12

1990-05-23 Application filed by G RAU GmbH and Co KG filed Critical G RAU GmbH and Co KG

1990-12-12 Publication of EP0401598A1 publication Critical patent/EP0401598A1/fr

1992-10-28 Application granted granted Critical

1992-10-28 Publication of EP0401598B1 publication Critical patent/EP0401598B1/fr

2010-05-23 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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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 to a center electrode for spark plugs of internal combustion engines, which has a core made of a highly thermally conductive base metal material, which is provided in the area of the ignition tip with a noble metal coating which consists of silver or a silver alloy with a predominant silver content.
Silver appears particularly useful in the range of precious metals because it is resistant to oxidation in the required temperature range and can be used relatively inexpensively.
An ignition tip made of silver has so far not been able to be combined satisfactorily with a highly thermally conductive base metal core material, in particular with copper.
the reason for this is that silver has a high oxygen solubility at higher temperatures.
the high oxygen solubility causes the oxygen to diffuse through the silver even after short operating times of the electrode and to strike the base core lying underneath the silver, as a result of which the latter is oxidized at the interface.
such an oxidation layer destroys the heat-conducting metallic connection between silver and core material and significantly reduces the heat transfer.
the invention is based on the task of creating a center electrode for spark plugs of internal combustion engines, in which the favorable properties of the silver cladding of a core made of a highly thermally conductive base metal material can be fully utilized without the formation of an oxide or the formation of a eutectic in the area of the boundary layer.
the characteristic of the invention is to be seen in the fact that at the interface between the core material and the sheathing at least one oxygen-impermeable and / or the formation of a eutectic between the core material and the material of the sheathing is provided.
the formation of the eutectic is of less importance than the formation of oxides and vice versa, so that the effect of the separating layer can be restricted to avoiding the formation of a eutectic or to preventing the passage of oxygen, in most cases it appears to be of practical use to avoid both the oxide formation in the area of the boundary layer and the formation of a eutectic by a common or several combined separating layers.
the separating layer or layers the thickness of which can preferably be less than 50 ⁇ m, can be provided both as a coating of the core material and as a support on the inside of the casing or in mutual attachment.
This formation of one or more separating layers enables the production of a copper-silver composite electrode, whereby a reduction in the use of noble metals by at least 50% can be achieved compared to the previously known solid silver center electrode.
Copper is preferably used as the core material and silver as the material of the cladding.
silver is preferably used as the core material and silver as the material of the cladding.
other combinations between highly thermally conductive base metallic materials or alloys as the core material and silver or silver alloys with a predominant proportion of silver can advantageously be used.
the silver sheathing of the electrode can optionally advantageously be alloy additives, e.g. made of tin or aluminum, which reduce the oxygen permeability of the silver. If there is sufficient effectiveness, it may be possible to dispense with the formation of a special separating layer which prevents the passage of oxygen. However, most silver alloys with reduced oxygen solubility also result in reduced thermal conductivity, which limits the area of application for the stated purpose.
the separating layer for preventing the formation of a eutectic can advantageously consist of tantalum, iron, nickel or alloys of these materials or of an AgSn alloy.
An expedient embodiment can provide that only a single layer which is impermeable to oxygen and which prevents the interdiffusion of core material and material of the casing is arranged at the interface between the core material and the casing. Platinum is preferably suitable for this.
AuNi alloys can also be used advantageously as the only separating layer to prevent the passage of oxygen and the interdiffusion between the core material and the casing.
a center electrode for spark plugs is created in which a noble metal sheath forming the ignition tip, made of silver or an alloy with a predominant silver content, can be permanently connected to a core made of base metal without the risk of destruction in the area of the boundary layer entry.
FIG. 1 shows a spark plug in which a center electrode 2 is inserted into an insulating body 1.
the insulating body 1 is connected to a metallic screw-in part 3, which has a ground electrode 5 at the front end of a threaded section 4.
a core 7 made of copper As can be seen in FIG. 2, with a noble metal casing 8 made of silver, covered.
a platinum layer 9 of approximately 20 ⁇ m thickness As a separating layer, which prevents both the passage of oxygen from the silver cladding to the core material and the formation of a eutectic between the core material and the cladding material .
the sheathing of the core material can be carried out in various known processing methods, for example by deep drawing and common extrusion molding. This can result in different shapes at the interface between the core and the silver coating.
FIG. 3 An advantageous embodiment in which the silver casing tapers upwards from the ignition tip is shown in FIG. 3. This shape design results in an additional saving of the precious metal.

Landscapes

Spark Plugs (AREA)

EP90109777A 1989-06-05 1990-05-23 Electrode centrale pour bougies d'allumage de moteurs à combustion interne Expired - Lifetime EP0401598B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3918278		1989-06-05
DE3918278A DE3918278A1 (de)	1989-06-05	1989-06-05	Mittelelektrode fuer zuendkerzen und brennkraftmaschinen

Publications (2)

Publication Number	Publication Date
EP0401598A1 true EP0401598A1 (fr)	1990-12-12
EP0401598B1 EP0401598B1 (fr)	1992-10-28

Family

ID=6382088

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP90109777A Expired - Lifetime EP0401598B1 (fr)	1989-06-05	1990-05-23	Electrode centrale pour bougies d'allumage de moteurs à combustion interne

Country Status (3)

Country	Link
US (1)	US5107169A (fr)
EP (1)	EP0401598B1 (fr)
DE (2)	DE3918278A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0554792A3 (en) *	1992-02-05	1993-11-24	Beru Werk Ruprecht Gmbh Co A	Silver-nickel composite material for electrical contacts and electrodes
EP0559438A3 (fr) *	1992-03-03	1995-04-19	Ngk Spark Plug Co
WO2015090709A1 (fr) *	2013-12-17	2015-06-25	Robert Bosch Gmbh	Électrode de bougie d'allumage, bougie à usure par corrosion réduite et procédé de fabrication d'une électrode de bougie
WO2025132416A1 (fr) *	2023-12-21	2025-06-26	Robert Bosch Gmbh	Électrode de bougie d'allumage comprenant un élément d'allumage contenant un métal noble

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP2853111B2 (ja) *	1992-03-24	1999-02-03	日本特殊陶業株式会社	スパークプラグ
DE19845018C1 (de) *	1998-09-30	1999-12-16	Fein C & E	Kraftgetriebener Schrauber
US9083156B2 (en)	2013-02-15	2015-07-14	Federal-Mogul Ignition Company	Electrode core material for spark plugs
DE102014109532B4 (de)	2013-07-08	2020-04-23	Borgwarner Ludwigsburg Gmbh	Koronazündeinrichtung
JP7151350B2 (ja) *	2017-10-19	2022-10-12	株式会社デンソー	内燃機関用の点火プラグ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE354850C (de) *		1922-06-16	Jan Pieter Reijnhout	Verfahren zur Erhoehung der Lebensdauer der Elektroden fuer Zuendkerzen von Verbrennungskraftmaschinen
US2783409A (en) *	1952-03-31	1957-02-26	Gen Motors Corp	Spark plug electrode and process for making same
DE3730627A1 (de) *	1986-09-12	1988-03-24	Ngk Spark Plug Co	Mittelelektrodenanordnung fuer eine zuendkerze

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1515866A (en) *	1922-06-24	1924-11-18	Lena J Marten	Spark plug
US2321840A (en) *	1942-01-23	1943-06-15	Gen Motors Corp	Spark plug and method of making same
JPS48103445A (fr) *	1972-04-14	1973-12-25

1989
- 1989-06-05 DE DE3918278A patent/DE3918278A1/de not_active Withdrawn
1990
- 1990-05-23 DE DE9090109777T patent/DE59000401D1/de not_active Expired - Lifetime
- 1990-05-23 EP EP90109777A patent/EP0401598B1/fr not_active Expired - Lifetime
- 1990-05-30 US US07/530,664 patent/US5107169A/en not_active Expired - Fee Related

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE354850C (de) *		1922-06-16	Jan Pieter Reijnhout	Verfahren zur Erhoehung der Lebensdauer der Elektroden fuer Zuendkerzen von Verbrennungskraftmaschinen
US2783409A (en) *	1952-03-31	1957-02-26	Gen Motors Corp	Spark plug electrode and process for making same
DE3730627A1 (de) *	1986-09-12	1988-03-24	Ngk Spark Plug Co	Mittelelektrodenanordnung fuer eine zuendkerze

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0554792A3 (en) *	1992-02-05	1993-11-24	Beru Werk Ruprecht Gmbh Co A	Silver-nickel composite material for electrical contacts and electrodes
US5500304A (en) *	1992-02-05	1996-03-19	Beru Ruprecht Gmbh & Co. Kg	Silver-nickel composite material for electrical contacts and electrodes
EP0559438A3 (fr) *	1992-03-03	1995-04-19	Ngk Spark Plug Co
WO2015090709A1 (fr) *	2013-12-17	2015-06-25	Robert Bosch Gmbh	Électrode de bougie d'allumage, bougie à usure par corrosion réduite et procédé de fabrication d'une électrode de bougie
WO2025132416A1 (fr) *	2023-12-21	2025-06-26	Robert Bosch Gmbh	Électrode de bougie d'allumage comprenant un élément d'allumage contenant un métal noble

Also Published As

Publication number	Publication date
DE3918278A1 (de)	1990-12-06
DE59000401D1 (de)	1992-12-03
US5107169A (en)	1992-04-21
EP0401598B1 (fr)	1992-10-28

Legal Events

Date	Code	Title	Description
1990-10-27	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1990-12-12	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): BE DE FR GB IT
1991-02-06	17P	Request for examination filed	Effective date: 19901207
1992-05-13	17Q	First examination report despatched	Effective date: 19920327
1992-09-11	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1992-10-07	ITF	It: translation for a ep patent filed
1992-10-28	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): BE DE FR GB IT
1992-11-27	ET	Fr: translation filed
1992-12-02	GBT	Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
1992-12-03	REF	Corresponds to:	Ref document number: 59000401 Country of ref document: DE Date of ref document: 19921203
1993-08-28	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1993-08-28	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1993-10-20	26N	No opposition filed
1994-04-15	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19940415 Year of fee payment: 5
1994-04-29	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: BE Payment date: 19940429 Year of fee payment: 5
1994-05-17	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 19940517 Year of fee payment: 5
1995-05-23	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Effective date: 19950523
1995-05-31	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: BE Effective date: 19950531
1995-11-30	BERE	Be: lapsed	Owner name: G. RAU G.M.B.H. & CO. Effective date: 19950531
1996-01-24	GBPC	Gb: european patent ceased through non-payment of renewal fee	Effective date: 19950523
1996-02-29	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Effective date: 19960229
1996-04-05	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST
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1996-07-26	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 19960726 Year of fee payment: 7
1998-02-03	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980203
2005-05-23	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050523

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DE69304812T2 (de)	1997-01-30	Zündkerze
DE69400986T2 (de)	1997-03-27	Zündkerze zur Anwendung in einem Verbrennungsmotor
DE3038649C2 (de)	1984-07-19	Zündkerze
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DE69702424T2 (de)	2000-11-09	Zündkerze für Verbrennungsmotor
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DE69102957T2 (de)	1994-11-03	Massenelektrode für Zündkerze und ihr Herstellungsverfahren.
DD202937A5 (de)	1983-10-05	Gluehkerze fuer brennkraftmaschinen
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DE2854071A1 (de)	1979-06-21	Zuendkerzen-isolator
EP0401598B1 (fr)	1992-10-28	Electrode centrale pour bougies d'allumage de moteurs à combustion interne
DE69800364T2 (de)	2001-02-22	Zündkerze
DE1601428A1 (de)	1971-01-07	Zuendkerze mit einer Verbundelektrode aus Gold oder Goldlegierung sowie Verfahren zu deren Herstellung
DE3802233C2 (fr)	1989-02-23
DE112020004055T5 (de)	2022-08-18	Konfiguration einer masseelektrode für zündkerzen
DE4431143B4 (de)	2004-09-23	Zündkerze für eine Brennkraftmaschine
DE3434762C2 (fr)	1988-07-07
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