(19)
(11) EP 0 987 435 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.06.2002 Bulletin 2002/25

(43) Date of publication A2:
22.03.2000 Bulletin 2000/12

(21) Application number: 99117884.9

(22) Date of filing: 10.09.1999
(51) International Patent Classification (IPC)7: F02P 3/02
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 14.09.1998 JP 25969798

(71) Applicant: NGK SPARK PLUG CO., LTD.
Nagoya-shi, Aichi 467-0872 (JP)

(72) Inventor:
  • Yoshida, Mitsutaka, c/o NGK Spark Plug Co., Ltd.
    Nagoya-shi, Aichi 467-0872 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Spark plug ignition coil assembly for direct ignition system


(57) A spark plug and ignition coil assembly for a direct ignition system is provided. The assembly comprises a spark plug having an insulator, the insulator having a hollow upper end portion having at an outer periphery thereof a first joining section, an ignition coil, a rubber molding embedding therein the ignition coil so as to cooperate with the ignition coil to constitute an integral unit, the rubber molding having a hollow lower end portion in which the upper end portion of the insulator is fitted, the lower end portion of the rubber molding having at an inner periphery there of a second joining section joined with the first engagement section, and fastening means for fastening the first and second joining sections together. The fastening means comprises a projection provided to one of the first and second joining sections and a recess provided to the other of the first and second joining sections.






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