Lateral electrode type spark plug with geometrical relationships

Details Lateral electrode type spark plug with geometrical relationships Lateral electrode type spark plug with geometrical relationships

1998-04-13

2000-07-18

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Spark plugs

Electrodes are pure figures of revolution about plug axis

313118, 313141, 313142, H01T 1320

Patent

active

060911859

ABSTRACT:
In a spark plug, a cylindrical metal shell (1) is provided whose inner wall has a rear section and a front section to respectively serve as a diameter-increased section and a diameter-decreased section with a seat portion (1) as a boundary therebetween. An insulator (2) is fixedly placed within the metal shell (1) so that a front end surface (21) of the insulator (2) extends beyond a front end surface (12) of the metal shell (1) with a shoulder portion (231) of an insulator nose (23) engaged against the seat portion (11) of the metal shell (1) by way of a packing (10). A center electrode (3) is fixedly placed within an axial bore (22) of the insulator (2), A ground electrode (4) is connected to the front end surface (12) of the metal shell (1), and bent so that a front end surface (41) of the ground electrode (4) opposes an outer surface (311) of the center electrode (3). The outer surface (311) and a front end surface (31) of the center electrode (3) are provided to respectively serve as a firing portion so as to form a spark discharge gap (Go) with the front end surface (41) of the ground electrode (4), the front end surface (41) of the ground electrode (4) forming an air gap (G) with an outer surface (25) of the insulator (2) so as to release creeping spark discharges along a front end surface (21) of the insulator (2).

REFERENCES:
patent: 3870918 (1975-03-01), Senda et al.
patent: 5109178 (1992-04-01), Yoshida et al.
patent: 5128583 (1992-07-01), Ma
patent: 5448130 (1995-09-01), Matsutani et al.
patent: 5731654 (1998-03-01), Benedikt et al.

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