EP0817341B2 - Zündkerze - Google Patents

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Publication number
EP0817341B2
EP0817341B2 EP97110583A EP97110583A EP0817341B2 EP 0817341 B2 EP0817341 B2 EP 0817341B2 EP 97110583 A EP97110583 A EP 97110583A EP 97110583 A EP97110583 A EP 97110583A EP 0817341 B2 EP0817341 B2 EP 0817341B2
Authority
EP
European Patent Office
Prior art keywords
alloy
spark plug
central electrode
spark
igniting portion
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
Application number
EP97110583A
Other languages
English (en)
French (fr)
Other versions
EP0817341A1 (de
EP0817341B1 (de
Inventor
Wataru Matsutani
Junichi Kagawa
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.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26504866&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0817341(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Priority to EP99122560A priority Critical patent/EP0975075A3/de
Publication of EP0817341A1 publication Critical patent/EP0817341A1/de
Application granted granted Critical
Publication of EP0817341B1 publication Critical patent/EP0817341B1/de
Publication of EP0817341B2 publication Critical patent/EP0817341B2/de
Anticipated expiration legal-status Critical
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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
    • 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 present invention relates to a spark plug for use in internal combustion engines of the type as indicated in the preamble portion of claim 1.
  • a spark plug of this type is disclosed in EP-A-0 243529.
  • Ir is easy to oxidize and evaporate in a high temperature range of 900 to 1,000°C. Therefore, if it is directly used in the igniting portion of the electrode, it is more consumed by oxidation and evaporation than by spark. Therefore, the spark plug using Ir in the igniting portion of an electrode is highly durable under low-temperature conditions as in driving on city roads but their endurance drops considerably during continuous running at high speed.
  • high temperature articles like rocket nozzles or spark plug electrodes are known formed from an alloy from the Pt-Ir-Rh system.
  • Preferred alloys are Rh-Ir alloys in which the content of rhodium is up to 60 wt%, more preferably up to 40 wt%.
  • an electrode for a spark plug comprising one atomic equivalent of Ir with one atomic equivalent of Rh, resulting in an alloy comprising 65.1 wt% Ir and 34.9 wt% Rh.
  • a spark plug which the igniting portion is made of a noble metal, i.e. of platinum, iridium, platinum-iridium alloy or iridium-based alloy.
  • the igniting portion of an electrode which forms a spark discharge gap is made of an alloy that is mainly made of Ir and which contains an amount of Rh in the stated range. Therefore, the consumption due to oxidation and evaporation of the Ir component at high temperatures is effectively retarded to thereby realize a highly durable spark plug.
  • the spark plug according to the present invention has a central electrode; an insulator provided exterior to said central electrode; a metallic shell provided exterior to said insulator; a ground electrode having one end coupled to the main metallic shell and having another end facing said central electrode; and an igniting portion that is secured to at least one of said central electrode and said ground electrode for forming a sparked discharge gap, wherein said igniting portion is made of Rh-containing alloy based on Ir, said alloy containing Rh in an amount ranging from 15 to 25 wt%.
  • the present inventors have found that if the igniting portion of an electrode which forms a spark discharge gap is made of an alloy that is mainly made of Ir and which contains an amount of Rh in the stated range, the consumption due to oxidation and evaporation ofthe Ir component at high temperatures is effectively retarded to thereby realize a highly durable spark plug.
  • a chip made of a metal having the stated composition may be joined by welding to the ground electrode and/or the central electrode.
  • the term "igniting portion" as used herein shall refer to that part of the joined chip which has not been subject to the effect of the compositional change due to welding (e.g., the portion other than that which has been alloyed with the constituent material of the ground or central electrode upon welding).
  • the Rh content of the alloy is less than 3%, the effectiveness of Rh in retarding the oxidation and evaporation of Ir is insufficient to prevent premature consumption of the igniting portion. Hence, the endurance of the spark plug is reduced. In this case, the igniting portion is consumed primarily in the tip end face of the chip welded to the central electrode and/or the ground electrode. However, the lateral sides of the chip may also be consumed if the Rh content is reduced.
  • the Rh content of the alloy is desirably adjusted to lie within such a range that the consumption of the igniting portion is unlikely to occur not only in the tip end face of the chip but also on its lateral sides.
  • the Rh content of the alloy is adjusted to lie within the range of 15 to 25 wt%, most desirably 18 to 22 wt%.
  • a spark plug 100 has a tubular main metallic shell 1, an insulator 2 fitted into the metallic shell 1 in such a way that the tip end 21 protrudes from the metallic shell 1, a central electrode 3 provided within the insulator 2 in such a way that the igniting portion 31 formed at the tip end protrudes from the insulator 2, and a ground electrode 4 coupled at one end to the main metallic shell 1 as by welding and which has the other end bent laterally such that its lateral side faces the tip end of the central electrode 3.
  • the ground electrode 4 has an igniting portion 32 formed in such a way that it faces the igniting portion 31 of the central electrode 3; the clearance between the two igniting portions 31 and 32 forms a spark discharge gap g.
  • the insulator 2 is a sinter of a ceramic material such as alumina or aluminum nitride as a main constituent, and it has an axial bore 6 through which the central electrode 3 is to be fitted.
  • the main metallic shell 1 is a cylinderical form made of a metal such as a low-carbon steel and which provides a housing for the spark plug 100.
  • the circumference of the metallic shell 1 has a threaded portion 7 formed to assist in the mounting of the spark plug 100 on an engine block (not shown).
  • the main body 3a of the central electrode 3 and the main body 4a of the ground electrode 4 are both typically made of a Ni alloy.
  • the igniting portion 31 of the central electrode 3 and the opposed firing portion 32 of the ground electrode 4 are both made of an alloy based on Ir and which contains Rh in an amount ranging from 15 to 25 wt%, most desirably 18 to 22 wt%.
  • the main body 3a of the central electrode 3 tapers at the tip end and its tip end face is formed flat.
  • a disk-shaped chip having an alloy formula for the igniting portion 31 in placed on the flat tip end face and laser welding, electron beam welding, resistance welding or other suitable welding technique is applied to the periphery of the joined surfaces to tom a weld line W, whereby the chip is securely fixed to the tip end face of the central electrode 3 to form the igniting portion 31.
  • a similar chip is placed on the ground electrode 4 in registry with the position of the igniting portion 31 and a weld line W is similarly formed on the periphery of the joined surfaces, whereby the chip is securely fitted to the ground electrode 4 to form the igniting portion 32.
  • the chips may be formed from a molten material obtained by mixing the necessary alloy ingredients to give the stated formula and melting the mixture; alternatively, the chips may be formed from a sinter obtained by shaping into a compact a suitable alloy powder or a mixture of the powders of elemental metal components in specified proportions and sintering the compact.
  • a raw material made of the molten alloy may be subjected to a working process including at least one of rolling, forging, drawing, cutting, shearing and blanking steps, whereby the chips are produced in a specified shape. Steps such as rolling, forging and cutting may be performed with the alloy being heated to a specified temperature (to effect "hot” or “warm” working). The temperature for these steps which is variable with the alloy composition may typically be at least 700°C.
  • a molten alloy may be hot rolled to a sheet, which is hot blanked to chips of a specified shape; alternatively, the molten alloy may be hot rolled or forged to a wire or rod shape, which is cut to chips of a specified length.
  • the iridium (Ir) which is the chief component of the chips has low ductility or malleability in its elemental form; however, in the presence of added Rh, the workability of the Ir is improved such that the resulting alloy can be rolled or forged into a sheet, a rod or a wire with great ease compared to the case where Rh is not added.
  • defects such as cracking are less likely to occur in the raw alloy material being in the process of rolling or forging and this in turn contributes to improvements in the efficiency of chip production and the materials yield. It should be noted here that the workability of the raw alloy material will increase with increasing Rh addition.
  • either one of the two opposed igniting portions 31 and 32 may be omitted. If this is the case, the spark discharge gap g is formed between the igniting portion 31 (or the opposed igniting portion 32) and the ground electrode 4 (or the central electrode 3).
  • the spark plug 100 operates according to the following mode of action.
  • the spark 100 is fitted on an engine block by means of the threaded portion 7 and used as a source to ignite an air-fuel mixture that is supplied into the combustion chamber.
  • the igniting portion 31 and the opposed igniting portion 32 define the spark discharge gap g; since both igniting portions are made of the aforementioned alloy, their consumption due to the oxidation and evaporation of Ir is sufficiently retarded to ensure that the spark discharge gap g will not increase for a prolonged period, thereby extending the life of the spark plug 100.
  • the result is shown in Fig. 3 in terms of the relationship between the Rh content of the alloy and the increase in the spark discharge gap.
  • the result is shown in Fig. 5 in terms of the relationship between the Rh content of the alloy and the increase in the spark discharge gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (2)

  1. Zündkerze, die umfaßt: eine Mittelelektrode (3); einen Isolator (2), der außerhalb der Mittelelektrode angeordnet ist; ein Metallgehäuse (1), das außerhalb des Isolators angeordnet ist; eine Masseelektrode (4), deren eines Ende an dem Hauptmetallgehäuse angebracht ist, und deren anderes Ende der Mittelelektrode zugewandt ist; sowie einen Zündabschnitt (31,32), der wenigstens an der Mittelelektrode (3) oder der Masseelektrode (4) befestigt ist, so daß ein Funkenentladungsspalt (g) entsteht, wobei der Zündabschnitt (31,32) aus Rh-haltiger Legierung auf Ir-Basis besteht,
    dadurch gekennzeichnet, daß:
    die Legierung Rh in einer Menge enthält, die von 15 bis 25 Gew.-% reicht.
  2. Zündkerze nach Anspruch 1, wobei die Legierung Rh in einer Menge enthält, die von 18 bis 22 Gew.-% reicht.
EP97110583A 1996-06-28 1997-06-27 Zündkerze Expired - Lifetime EP0817341B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99122560A EP0975075A3 (de) 1996-06-28 1997-06-27 Herstellungsverfahren einer Zündkerze

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP18834796 1996-06-28
JP18834796 1996-06-28
JP188347/96 1996-06-28
JP33511996 1996-11-28
JP33511996A JP3461670B2 (ja) 1996-06-28 1996-11-28 スパークプラグ及びその製造方法
JP335119/96 1996-11-28

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP99122560A Division EP0975075A3 (de) 1996-06-28 1997-06-27 Herstellungsverfahren einer Zündkerze

Publications (3)

Publication Number Publication Date
EP0817341A1 EP0817341A1 (de) 1998-01-07
EP0817341B1 EP0817341B1 (de) 2000-09-06
EP0817341B2 true EP0817341B2 (de) 2003-12-10

Family

ID=26504866

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97110583A Expired - Lifetime EP0817341B2 (de) 1996-06-28 1997-06-27 Zündkerze
EP99122560A Withdrawn EP0975075A3 (de) 1996-06-28 1997-06-27 Herstellungsverfahren einer Zündkerze

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP99122560A Withdrawn EP0975075A3 (de) 1996-06-28 1997-06-27 Herstellungsverfahren einer Zündkerze

Country Status (6)

Country Link
US (1) USRE43758E1 (de)
EP (2) EP0817341B2 (de)
JP (1) JP3461670B2 (de)
KR (1) KR100355886B1 (de)
CN (1) CN1059293C (de)
DE (1) DE69703011T3 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002231412A (ja) * 2001-01-31 2002-08-16 Ngk Spark Plug Co Ltd スパークプラグの製造方法及び製造装置
JP4121342B2 (ja) * 2001-11-13 2008-07-23 日本特殊陶業株式会社 クロメート被膜付きプラグ用金属部品及びその製造方法
JP4607253B2 (ja) * 2008-03-27 2011-01-05 日本特殊陶業株式会社 スパークプラグ及びスパークプラグの製造方法
DE102010032412B4 (de) * 2010-07-27 2012-03-08 Dkt Verwaltungs-Gmbh Verfahren zum Herstellen einer Zündelektrode für eine Vorkammerzündkerze und Vorkammerzündkerze
JP7057935B2 (ja) * 2016-12-22 2022-04-21 石福金属興業株式会社 耐熱性Ｉｒ合金

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB479540A (en) † 1936-09-30 1938-02-08 Alan Richard Powell Improvements in electrodes for sparking plugs
EP0575163A1 (de) † 1992-06-17 1993-12-22 Ngk Spark Plug Co., Ltd Zündkerze
EP0702093A1 (de) † 1994-09-16 1996-03-20 Johnson Matthey Public Limited Company Hochtemperaturbeständiger Formkörper

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US1850819A (en) 1931-03-06 1932-03-22 Wilson H A Co Alloy
US4324588A (en) 1979-08-17 1982-04-13 Engelhard Corporation Arc erosion resistant composite materials and processes for their manufacture
JPS57130384A (en) 1981-02-04 1982-08-12 Nippon Denso Co Spark plug for internal combustion engine
US4699600A (en) 1981-04-30 1987-10-13 Nippondenso Co., Ltd. Spark plug and method of manufacturing the same
DE3563498D1 (en) 1984-08-07 1988-07-28 Ngk Spark Plug Co Spark plug
JPS6258114A (ja) 1985-09-09 1987-03-13 Toshiba Corp ロ−ドサ−ベイシステム
JPS62226592A (ja) * 1986-03-28 1987-10-05 日本特殊陶業株式会社 点火プラグ
DE3725228A1 (de) 1987-07-30 1989-02-09 Bayer Ag Verfahren zur gewinnung von reinen aromaten
CN1009840B (zh) * 1988-10-14 1990-10-03 中国有色金属工业总公司昆明贵金属研究所 火花塞用铂基合金
JPH03101086A (ja) * 1989-09-14 1991-04-25 Ngk Spark Plug Co Ltd 内燃機関用スパークプラグ
JPH03110779A (ja) 1989-09-25 1991-05-10 Ngk Spark Plug Co Ltd 光センサ内蔵型スパークプラグ
JPH04329286A (ja) 1991-04-30 1992-11-18 Nippondenso Co Ltd スパークプラグの製造方法
JP2902186B2 (ja) 1991-12-04 1999-06-07 日本特殊陶業株式会社 気体燃料機関用スパークプラグ
JPH05335066A (ja) 1992-06-01 1993-12-17 Nippondenso Co Ltd 内燃機関用スパークプラグ
US5320569A (en) 1992-07-27 1994-06-14 Ngk Spark Plug Co., Ltd. Method of making a spark plug
US5465022A (en) * 1992-08-12 1995-11-07 Nippondenso Co., Ltd. Spark plug for internal-combustion engine and manufacture method of the same
JP3344737B2 (ja) * 1992-09-10 2002-11-18 日本特殊陶業株式会社 スパークプラグの製造方法
JP3265067B2 (ja) 1993-07-23 2002-03-11 日本特殊陶業株式会社 スパークプラグ
JPH0737673A (ja) 1993-07-23 1995-02-07 Ngk Spark Plug Co Ltd スパークプラグ用電極
JPH0737674A (ja) 1993-07-26 1995-02-07 Ngk Spark Plug Co Ltd スパークプラグ
JPH07268574A (ja) 1994-03-25 1995-10-17 Tanaka Kikinzoku Kogyo Kk イリジウム線の製造方法
JP3562533B2 (ja) 1994-08-03 2004-09-08 株式会社デンソー 内燃機関用スパークプラグ
GB2302367B (en) * 1995-06-15 1998-11-25 Nippon Denso Co Spark plug for internal combustion engine
JP2877035B2 (ja) 1995-06-15 1999-03-31 株式会社デンソー 内燃機関用スパークプラグ
JPH09219274A (ja) * 1995-12-06 1997-08-19 Denso Corp スパークプラグ
US5973443A (en) 1996-05-06 1999-10-26 Alliedsignal Inc. Spark plug electrode tip for internal combustion engine
JP3000955B2 (ja) 1996-05-13 2000-01-17 株式会社デンソー スパークプラグ
GB2479540A (en) 2010-04-13 2011-10-19 Adam Ford Corrupting and erasing data on a storage device when computer casing is broken

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB479540A (en) † 1936-09-30 1938-02-08 Alan Richard Powell Improvements in electrodes for sparking plugs
EP0575163A1 (de) † 1992-06-17 1993-12-22 Ngk Spark Plug Co., Ltd Zündkerze
EP0702093A1 (de) † 1994-09-16 1996-03-20 Johnson Matthey Public Limited Company Hochtemperaturbeständiger Formkörper

Also Published As

Publication number Publication date
DE69703011T3 (de) 2004-05-27
USRE43758E1 (en) 2012-10-23
EP0975075A2 (de) 2000-01-26
EP0817341A1 (de) 1998-01-07
EP0817341B1 (de) 2000-09-06
DE69703011T2 (de) 2001-01-11
KR980006677A (ko) 1998-03-30
CN1170980A (zh) 1998-01-21
EP0975075A3 (de) 2000-02-02
JP3461670B2 (ja) 2003-10-27
CN1059293C (zh) 2000-12-06
DE69703011D1 (de) 2000-10-12
KR100355886B1 (ko) 2002-12-26
JPH1074575A (ja) 1998-03-17

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