Spark plug and its manufacturing method

Details Spark plug and its manufacturing method Spark plug and its manufacturing method

1997-10-03

1999-11-09

Ramsey, Kenneth J.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313144, 445 7, H01T 2102

Patent

active

059820802

ABSTRACT:
A hole is formed on a central electrode. A chip has a leg portion. A distal end of the leg portion is entirely united with a bottom surface of the hole by resistance welding. A plurality of fused portions are formed at a boundary between the chip and the central electrode. The fused portions integrate the chip and the central electrode by fusing them together. Each fused portion extends in a radial direction of the chip. The entire periphery of a pointed end of each fused portion penetrates radially inside the outer cylindrical surface of the leg portion of the chip.

REFERENCES:
patent: 4684352 (1987-08-01), Clark et al.
patent: 5440198 (1995-08-01), Oshima et al.

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