Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1998-02-12
2000-05-16
Patel, Nimeshkumar D.
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313138, 313139, 445 7, H01T 1320
Patent
active
060641444
ABSTRACT:
A spark plug, especially one for a gas-fueled internal combustion engine has an electrically conducting spark plug body (1), a central electrode (3) which is located in the spark plug body (1) and which is electrically insulated from and projects away from the spark plug body (1), and a ground electrode (4) which is electrically connected to the spark plug body (1) and is made in the form of an annular electrode. The annular electrode (4) surrounds the front part of central electrode (3) such that an annular ignition gap (ZS) is formed between them. Surfaces of the central electrode (3) and the annular electrode (4) bordering the ignition gap (ZS) are provided with precious metal armorings in the form of sleeves (5, 6,), especially of platinum or a platinum alloy. This yields a spark plug with an extremely long service life. A method for producing this spark plug involves the steps of forming a concentric centering groove in the spark plug body for the ground electrode, forming welding cams on the ground electrode, and inserting the ground electrode with the welding cams into the centering groove of the spark plug body and welding the welding cams to the spark plug body.
REFERENCES:
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patent: 5014656 (1991-05-01), Leptich et al.
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patent: 5430346 (1995-07-01), Johnson
Patent abstracts of Japan, vol. 14, No. 070, (E-0886), Feb. 8, 1990 & JP 01 289084 A NGK Spark Plug Co. Ltd., Nov. 21, 1989, English Abstract.
Patent Abstracts of Japan, vol. 096, No. 011, Nov. 29, 1996, & JP 08 171976 A Nippondenso Co. Ltd., Jul. 2, 1996, English Abstract.
Ambacher Heinz
Knoll Harald
Niessner Werner
Schneck Erwin
Von Hacht Dirk
Beru AG
Hopper Todd Reed
Patel Nimeshkumar D.
Safran David S.
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