Spark plug with electrodes having noble metal inserts

Details Spark plug with electrodes having noble metal inserts Spark plug with electrodes having noble metal inserts

1987-02-18

1988-09-13

Moore, David K.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313136, 445 7, H01T 1302, H01T 1320, H01T 1332, H01T 2102

Patent

active

047712104

ABSTRACT:
In a spark plug with center electrode and body electrode in which the cylindrical center electrode comprises in its end face a blind bore in which a pin-shaped small-volume noble metal insert is inserted and fixed by upsetting, it is provided that the front region (1a) of the center electrode (1), provided with end-side bore (2) and insert (3) disposed therein, is reduced radially over almost the entire length of the bore (2), the reduced region (1a) having a constant diameter, and that a further pin-shaped small-volume noble metal insert (5) is fixed in a bore (4) formed coaxially with the bore (2) in the body electrode (6). The production of the spark plug can proceed from commercially usual spark plug parts made on conventional production machines; the noble metal insert of the spark plug is securely attached in the center electrode and the body electrode part opposite the noble metal insert has a reduced burnup, thus increasing the life of the spark plug.

REFERENCES:
patent: 4488081 (1984-12-01), Kondo et al.
patent: 4540910 (1985-09-01), Kondo et al.

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