EP0646292A1 - Elektrisch leitende dichtungsmasse für zündkerzen. - Google Patents
Elektrisch leitende dichtungsmasse für zündkerzen.Info
- Publication number
- EP0646292A1 EP0646292A1 EP94906837A EP94906837A EP0646292A1 EP 0646292 A1 EP0646292 A1 EP 0646292A1 EP 94906837 A EP94906837 A EP 94906837A EP 94906837 A EP94906837 A EP 94906837A EP 0646292 A1 EP0646292 A1 EP 0646292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- center electrode
- sealant
- graphite
- sealing compound
- electrically conductive
- 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.)
- Granted
Links
- 150000001875 compounds Chemical class 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 title claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 21
- 239000011521 glass Substances 0.000 claims abstract description 11
- 239000000565 sealant Substances 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims 2
- 239000000203 mixture Substances 0.000 description 9
- 239000012212 insulator Substances 0.000 description 8
- 239000004071 soot Substances 0.000 description 7
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229920001353 Dextrin Polymers 0.000 description 2
- 239000004375 Dextrin Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000005388 borosilicate glass Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 235000019425 dextrin Nutrition 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910007921 Li-Ca Inorganic materials 0.000 description 1
- 229910008298 Li—Ca Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000006234 thermal black Substances 0.000 description 1
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
- H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
-
- 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
- H01T13/40—Sparking plugs structurally combined with other devices
- H01T13/41—Sparking plugs structurally combined with other devices with interference suppressing or shielding means
Definitions
- the invention relates to an electrically conductive sealant for a contact package for spark plugs according to the preamble of the main claim. Sealing compounds serve to seal the center electrode in the insulator body of the spark plug and to suppress sparks.
- the meltdown is also referred to as resistance meltdown.
- the resistance fuse consists of an electrically well-conductive contact package on the connection-side and on the ignition-side part of the center electrode and an intermediate resistance package.
- the resistance package consists of glass and other inorganic additives as fillers, which do not melt at the melting temperatures used, and of carbon as an electrically conductive component.
- the carbon is added as carbon black and / or by means of a carbon-forming organic binder. From DE-PS 32 26 340 u. a. known to use carboxymethyl cellulose (CMC) as organic binder.
- CMC carboxymethyl cellulose
- the sealing compound according to the invention for the contact package with the characterizing features of claim 1 has the advantage that the sealing compound used to produce the contact package can be prepared much better than with the finely divided soot that tends to agglomerate.
- the measures specified in the subclaims make advantageous developments of the resistance melting specified in the main claim possible. Because of the higher tendency of fine-grained graphite to oxidize, it is particularly advantageous if the graphite has as small a grain fraction as possible below 5 nm. To The grain size is limited at the top by the number of contact points between the graphite grains, which becomes smaller and smaller as the grain size increases. A particularly narrow particle size distribution with an average particle size between approximately 20 and 50 l cm, preferably from 30 to 40 ⁇ m, is particularly expedient, the proportion of the particle size below 10 ⁇ m being less than 5% and the particle size above 96 - X ⁇ below 10% should be.
- the contact package can contain up to 4% by volume of fine-grained aluminum powder as a reducing agent. Particularly good stability at high electrical loads is achieved if, after the sealing compound has melted, the contact package on the connection-side part of the center electrode is stronger than the contact package on the ignition-side center electrode.
- the spark plug shown consists of an insulator 11 flanged in a gas-tight manner in a metallic plug housing 10, in the insulator bore 12 of which a connection-side center electrode 13 and an ignition-side center electrode 14 are inserted.
- a resistance seal 15, 16, 17 is inserted, which electrically connects the connection-side center electrode 13 to the ignition-side center electrode 14.
- the resistance fuse consists of a first center electrode 13 on the connection side Adjacent contact package 15, a second contact package 15 in contact with the ignition-side center electrode 14 and a resistor package 17 arranged between the two contact packages 15, 16.
- the composition of the contact packages 15 and 16 and the resistance package 17 will be discussed further below.
- the ground electrode of the spark plug is designated 18.
- the minimum height between the ignition-side center electrode 14 and the resistance package 17 is 0.5 mm and between the resistance package 17 and the connection-side center electrode 13 2 mm.
- the reason for this requirement lies in the sealing function of the contact packets 15, 16 against the ingress of oxygen during the melting process.
- oxygen penetrates to the resistance package 17 part of the carbon is oxidized, whereby the resistance value is partially increased.
- more energy is converted at the point with the increased resistance value. This increases the temperature at this point, which can lead to the failure of the candle.
- Resistance or electrically conductive sealing compounds are used for the two contact packages 15, 16 and the resistance package 17.
- the sealing compounds of both the contact packs 15, 16 and the resistor pack 17 contain a Li-Ca borosilicate glass of the following composition in mass percent:
- the electrically conductive sealing compound used to produce the contact packets 15, 16 has the following composition in% by volume:
- SiC grain size 150 to 210 LLC ⁇
- a resistance premix is produced to produce the resistance mass.
- the resistance premix for a 6 kiloohm resistor has the following composition in mass percent:
- the resistance premix is finally combined with additional glass and fused alumina in the following composition in vol.%:
- the glass and the fused alumina are mixed dry.
- the pre-ground resistance premix is then coated onto the coarse glass and corundum grains using an aqueous solution of purified Ca-carboxymethyl cellulose (CMC).
- CMC Ca-carboxymethyl cellulose
- the proportion of CMC in the finished resistance mass is 0.1 to 1.0 mass%, preferably 0.2 mass%.
- the mixture is finally dried and the coarse constituents are destroyed or separated off by sieving.
- the resistance value of the resistor package 17 can be adjusted by changing the amount of soot, the resistance premix and the amount of CMC.
- the electrically conductive sealing compound of the ignition-side contact package 16, then the resistance compound of the resistor package 17 and finally the electrically conductive sealing compound of the contact package 15 are inserted into the insulator bore 12 of the insulator 11 with the ignition-side center electrode 14 inserted filled and pre-pressed by means of a stamp.
- the connection-side center electrode 13 is placed and pressed onto the upper contact package 15.
- the pre-assembled insulator 11 is heated to a temperature of 850 to 900 ° C. At these temperatures, the connection-side center electrode 13 is pressed into the softened contact mass of the contact package 15.
- the filling quantities of the electrically conductive sealing compounds and the resistance compound are selected so that after filling and pressing, the connection-side center electrode 13 protrudes about 6 to 8 mm beyond the end face of the insulator 11, and that after heating and pressing in the center electrode 13, the following Package heights are obtained:
- Spark plugs with the resistance meltdown according to the invention were operated in comparison to spark plugs with soot and graphite as the conductive phase in the contact package in an engine at high thermal load.
- resistance increases of up to> 20 megohms occurred after only about 200 hours of operation.
- a clear, porous seam around the center electrode head was recognizable, which was created by burning out soot due to the high thermal load during engine operation.
- the spark plugs with the resistance melting according to the invention described in the exemplary embodiment described showed only slight changes in resistance even after 500 operating hours and no porosity was discernible around the central electrode head, which would have indicated oxidation of the graphite.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4306402 | 1993-03-02 | ||
DE4306402A DE4306402A1 (de) | 1993-03-02 | 1993-03-02 | Elektrisch leitende Dichtungsmasse für Zündkerzen |
PCT/DE1994/000115 WO1994021015A1 (de) | 1993-03-02 | 1994-02-05 | Elektrisch leitende dichtungsmasse für zündkerzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0646292A1 true EP0646292A1 (de) | 1995-04-05 |
EP0646292B1 EP0646292B1 (de) | 1997-07-16 |
Family
ID=6481692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94906837A Expired - Lifetime EP0646292B1 (de) | 1993-03-02 | 1994-02-05 | Elektrisch leitende dichtungsmasse für zündkerzen |
Country Status (7)
Country | Link |
---|---|
US (1) | US5565730A (de) |
EP (1) | EP0646292B1 (de) |
JP (1) | JPH07506698A (de) |
KR (1) | KR100289758B1 (de) |
CN (1) | CN1038628C (de) |
DE (2) | DE4306402A1 (de) |
WO (1) | WO1994021015A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19612508C2 (de) * | 1996-03-29 | 2000-05-04 | Bremi Auto Elektrik Ernst Brem | Verbindungsstecker |
JP3813708B2 (ja) | 1996-09-12 | 2006-08-23 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP3819586B2 (ja) * | 1997-04-23 | 2006-09-13 | 日本特殊陶業株式会社 | 抵抗体入りスパークプラグ、スパークプラグ用抵抗体組成物及び抵抗体入りスパークプラグの製造方法 |
US6467756B1 (en) * | 1998-05-20 | 2002-10-22 | Western Profiles Limited | Post and rail system using extrudable plastic posts |
US6426586B1 (en) | 1999-02-12 | 2002-07-30 | Alliedsignal Inc. | Contact glass composition for use in spark plugs |
US7365480B2 (en) | 2004-04-30 | 2008-04-29 | Ngk Spark Plug Co., Ltd. | Spark plug |
JP4922980B2 (ja) * | 2008-03-31 | 2012-04-25 | 日本特殊陶業株式会社 | スパークプラグ |
DE102011101769A1 (de) * | 2011-05-17 | 2012-11-22 | Minebea Co., Ltd. | Spindelmotor mit fluiddynamischem Lagersystem |
DE102014112225B4 (de) * | 2014-08-26 | 2016-07-07 | Federal-Mogul Ignition Gmbh | Zündkerze mit Entstörelement |
JP6612499B2 (ja) * | 2014-11-25 | 2019-11-27 | 株式会社デンソー | スパークプラグ |
JP6628767B2 (ja) | 2017-07-20 | 2020-01-15 | 日本特殊陶業株式会社 | スパークプラグ |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2245404C3 (de) * | 1972-09-15 | 1978-08-31 | Robert Bosch Gmbh, 7000 Stuttgart | Massewiderstand, insbesondere für Zündkerzen, sowie Verfahren zur Herstellung desselben |
DE2245403C2 (de) * | 1972-09-15 | 1984-04-05 | Robert Bosch Gmbh, 7000 Stuttgart | Elektrisch leitende Dichtungsmasse für Zündkerzen, sowie Verfahren zur Herstellung derselben |
JPS534131A (en) * | 1976-06-29 | 1978-01-14 | Ngk Spark Plug Co Ltd | Ignition plug containing low noise resistance |
US4193012A (en) * | 1978-10-10 | 1980-03-11 | Champion Spark Plug Company | Spark plug seal |
JPS5613687A (en) * | 1979-07-13 | 1981-02-10 | Hitachi Ltd | Resistance glass sealed ignition plug |
JPS5812302A (ja) * | 1981-07-16 | 1983-01-24 | 日本特殊陶業株式会社 | 抵抗入り点火栓用抵抗体組成物 |
DE3147291A1 (de) * | 1981-11-28 | 1983-06-01 | Robert Bosch Gmbh, 7000 Stuttgart | Sensor |
US4795944A (en) * | 1987-08-10 | 1989-01-03 | General Motors Corporation | Metallized glass seal resistor composition |
-
1993
- 1993-03-02 DE DE4306402A patent/DE4306402A1/de not_active Withdrawn
-
1994
- 1994-02-05 KR KR1019940703898A patent/KR100289758B1/ko not_active IP Right Cessation
- 1994-02-05 US US08/313,100 patent/US5565730A/en not_active Expired - Fee Related
- 1994-02-05 CN CN94190101A patent/CN1038628C/zh not_active Expired - Fee Related
- 1994-02-05 EP EP94906837A patent/EP0646292B1/de not_active Expired - Lifetime
- 1994-02-05 WO PCT/DE1994/000115 patent/WO1994021015A1/de active IP Right Grant
- 1994-02-05 JP JP6519439A patent/JPH07506698A/ja active Pending
- 1994-02-05 DE DE59403368T patent/DE59403368D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9421015A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1103540A (zh) | 1995-06-07 |
EP0646292B1 (de) | 1997-07-16 |
JPH07506698A (ja) | 1995-07-20 |
CN1038628C (zh) | 1998-06-03 |
KR100289758B1 (ko) | 2001-05-15 |
DE59403368D1 (de) | 1997-08-21 |
DE4306402A1 (de) | 1994-09-08 |
WO1994021015A1 (de) | 1994-09-15 |
US5565730A (en) | 1996-10-15 |
KR950701462A (ko) | 1995-03-23 |
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