Spark plug for use in internal combustion engine

Details Spark plug for use in internal combustion engine Spark plug for use in internal combustion engine

1991-08-27

1993-08-24

Demeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313143, H01T 1320

Patent

active

052392252

ABSTRACT:
A spark plug for an internal combustion engine includes a metallic shell within which a tubular insulator is placed, a center electrode is provided within the insulator to form a spark gap between a front end of the center electrode and an outer electrode extending from the metallic shell. First and second stepped portions are provided near a front portion of the center electrode to form a clearance between an outer wall of the center electrode and an inner wall of the insulator. The stepped portions have a progressively decreasing diameter toward the front end of the center electrode. A tapered portion is provided at an inner wall of the insulator by bevelling a front open end of the insulator. This maintains high insulation of the insulator with significantly low carbon deposit, thus avoiding ignition failure of the spark plug.

REFERENCES:
patent: 2353620 (1944-07-01), Weinerth
patent: 4122366 (1978-10-01), Stutterheim et al.
patent: 4845400 (1989-07-01), Takamura et al.
patent: 5124612 (1992-06-01), Takamura et al.

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