WO1988009073A1 - Etanchement autocentreur pour structure a electrodes - Google Patents

Etanchement autocentreur pour structure a electrodes Download PDF

Info

Publication number
WO1988009073A1
WO1988009073A1 PCT/EP1987/000253 EP8700253W WO8809073A1 WO 1988009073 A1 WO1988009073 A1 WO 1988009073A1 EP 8700253 W EP8700253 W EP 8700253W WO 8809073 A1 WO8809073 A1 WO 8809073A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
insulating housing
glue
insulating
electrode structure
Prior art date
Application number
PCT/EP1987/000253
Other languages
English (en)
Inventor
Michael G. May
Original Assignee
May Michael G
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
Priority to US06/799,054 priority Critical patent/US4673455A/en
Application filed by May Michael G filed Critical May Michael G
Priority to PCT/EP1987/000253 priority patent/WO1988009073A1/fr
Publication of WO1988009073A1 publication Critical patent/WO1988009073A1/fr

Links

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
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes

Definitions

  • This invention relates to electrode structures , whereby electrons are conveyed through a conductor placed in an insulator in a substantially gas tight manner, as for example insulated electrical power conductors for spark plugs , flame-front sensors , ionization sensors, and the like, such as used in a generally automotive engineering context, and more particularly to a method and apparatus for fixing the central electrode of such devices within a surrounding insulating housing .
  • a method and apparatus in which the parts comprising an electrode structure used as a spark plug, sensing probe and the like, are dramatically reduced and only a very thin clearance between the parts is provided, so that centering procedures used for centering the center electrode within an insulating housing are eliminated .
  • the method and apparatus further provides for the use of a fluid glue to be used in a fixation zone between the center electrode and the insulating housing which may flow by capillary action to form a seal therebetween and which also prevents heat transfer between one end of the electrode exposed to combustion gases within a combustion chamber and the exterior end of the electrode.
  • Fig . 1 is a partial cross-section and elevation view of the electrode device constructed according to the invention ;
  • Fig . 2 is an enlarged schematic view of a portion of the embodiment as shown in Fig. 1 .
  • a sensor electrode including an electrode 1 fixed in an insulating housing 2 shown in turn is surrounded by an electrically conductive housing 3 having a shoulder portion 4 circumferentially extending therearound which serves to fix the housing in the wall face of a combustion chamber or a cylinder head of an engine or wherever the sensor electrode is to be used .
  • An electrical ground electrode 9 is shown in dotted lines extending from the housing 3. A thin annular space or gap exists between the electrode 1 and the insulating housing 2 , and between the insulating housing and the housing 3.
  • the electrode 1 is seen to have a portion that extends beyond the insulating housing on both ends thereof and has a knurled surface area 5 near one end portion thereof confined within the insulating housing and a circumferentially extending annular groove 6 is formed adjacent to one end of the knurled portion .
  • annular grooves 6' as shown in housing 3 may be used .
  • the very thin space or gap between the insulating housing and the knurle portion on the electrode can be termed as a fixation zone in which a fluid glue 7 can be introduced, by capillary action for fixing the relative parts with respect to each other , as well as improving the heat transfer.
  • a glue such as "LOCTITE RC/620" or similarly performing glues has been found to be suitable, even at room temperatures. Such glues can withstand temperatures up to 220°C, for example.
  • the annular groove 6 serves to limit the flow of glue and thus acts as a barrier for the glue as well as a barrier for heat flow.
  • a thin space between the housing 3 and the insulating portion 2 also receives a fluid glue, and the threaded portion 8 in the housing 3 serves to increase the contact adhesion surface between the insulating housing 2 and the housing 3.
  • the threaded portion 8 in the housing 3 serves to increase the contact adhesion surface between the insulating housing 2 and the housing 3.
  • Fig . 2 shows an embodiment of the invention in which guide shoulders 11 are shown on the center electrode 1 for guiding same within the insulating housing 2 , if such centering is desirable. Also, the glue is shown to have filler particles 10 included therein.
  • electrode structures such as flame- front sensors and the like, can be fabricated having only 3 mm, external diameter, which thus readily allows “through the deck” installation in existing cylinder heads and combustion chambers of internal combustion engines.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spark Plugs (AREA)

Abstract

Dans un procédé amélioré pour fabriquer des structures à électrodes, notamment des détecteurs de front de flammes, des bougies d'allumage et similaire, l'électrode centrale (1), son logement isolant (2), et un logement extérieur (3) sont dimensionnés de manière à ménager un faible écartement (7) entre chacune des parties; une colle fluide est introduite par capillarité dans l'écartement ou l'espacement ménagés dans une zone de fixation à une extrémité de la structure, de sorte que le dispositif est autocentreur, thermoscellé, et d'un diamètre non supérieur à 3 mm, facilitant ainsi un montage rapide dans les culasses et les chambres de combustion du moteur.
PCT/EP1987/000253 1984-05-10 1987-05-14 Etanchement autocentreur pour structure a electrodes WO1988009073A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/799,054 US4673455A (en) 1984-05-10 1985-11-18 Self-centering sealing for electrode structure
PCT/EP1987/000253 WO1988009073A1 (fr) 1987-05-14 1987-05-14 Etanchement autocentreur pour structure a electrodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1987/000253 WO1988009073A1 (fr) 1987-05-14 1987-05-14 Etanchement autocentreur pour structure a electrodes

Publications (1)

Publication Number Publication Date
WO1988009073A1 true WO1988009073A1 (fr) 1988-11-17

Family

ID=8165187

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000253 WO1988009073A1 (fr) 1984-05-10 1987-05-14 Etanchement autocentreur pour structure a electrodes

Country Status (1)

Country Link
WO (1) WO1988009073A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393497A (en) * 1943-03-06 1946-01-22 Firestone Tire & Rubber Co Spark plug
DE1098292B (de) * 1957-02-27 1961-01-26 Magneti Marelli Spa Verfahren zum teilweisen oder gaenzlichen Freilegen der Mittelelektrode einer Zuendkerze fuer Brennkraftmaschinen von dem sie umgebenden Befestigungskitt
FR1307229A (fr) * 1961-12-01 1962-10-19 Magneti Marelli Spa Bougie d'allumage avec écran
US4181549A (en) * 1977-03-10 1980-01-01 American Hospital Supply Corporation Solvent-bonded joint and method of making the same
US4482415A (en) * 1980-11-17 1984-11-13 United Aircraft Products, Inc. Sealing mechanical tube joints

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393497A (en) * 1943-03-06 1946-01-22 Firestone Tire & Rubber Co Spark plug
DE1098292B (de) * 1957-02-27 1961-01-26 Magneti Marelli Spa Verfahren zum teilweisen oder gaenzlichen Freilegen der Mittelelektrode einer Zuendkerze fuer Brennkraftmaschinen von dem sie umgebenden Befestigungskitt
FR1307229A (fr) * 1961-12-01 1962-10-19 Magneti Marelli Spa Bougie d'allumage avec écran
US4181549A (en) * 1977-03-10 1980-01-01 American Hospital Supply Corporation Solvent-bonded joint and method of making the same
US4482415A (en) * 1980-11-17 1984-11-13 United Aircraft Products, Inc. Sealing mechanical tube joints

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