Internal-combustion engines – Igniters – Sparkers
Patent
1996-02-16
1997-12-16
Dolinar, Andrew M.
Internal-combustion engines
Igniters
Sparkers
313137, 313143, 313144, 445 7, H01T 1308
Patent
active
056973349
ABSTRACT:
A spark plug (11) having a center conductive path (21) with a cylindrical body having a tip (33, 51, 77) at one end and a terminal (23) near the other end has an insulator (41, 45) radially surrounding the center electrode and a substantially cylindrical body with at least first and second diameter sections separated by a shoulder (29). A ground shield (37) surrounds the insulator first diameter section and including near one end a frustoconical section (31) juxtaposed with the insulator shoulder. There is a ground electrode (55, 57, 73) near the other end having a portion thereof (53, 75) aligned with the center electrode tip to form a spark gap. An annular retainer (59) surrounds the insulator second diameter section and including a threaded portion (61) threadedly engaging the threaded portion (17) of a generally cylindrical opening in the head of an internal combustion engine. The retainer includes a frustoconical portion (63) overlapping the ground shield frustoconical section and juxtaposed insulator shoulder securing the ground shield and retainer together with the insulator captured therebetween. The annular retainer has a sidewall thickness in the region of the threaded portion which is substantially greater than the sidewall thickness in the region overlapping the ground shield.
REFERENCES:
patent: 2944178 (1960-07-01), Schaub
patent: 4730582 (1988-03-01), Linsay
patent: 4901688 (1990-02-01), Kashiwara et al.
patent: 4989557 (1991-02-01), Penney
patent: 5014656 (1991-05-01), Leptich et al.
patent: 5091672 (1992-02-01), Below
patent: 5258684 (1993-11-01), Matesco
Allied-Signal Inc.
Dolinar Andrew M.
Massung Howard G.
Vo Hieu T.
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