SPARK PLUG SHELL AND METHOD OF MANUFACTURE
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United States of America Patent
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Issued Date -
May 26, 2022
app pub date -
Apr 9, 2020
filing date -
Apr 9, 2020
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Abstract
A metal shell for a spark plug is made from a steel material that has increased carbon content and, in some embodiments, boron as well. The steel material is well-suited for extrusion because of its ductility, while maintaining requisite strength. The spark plug shell may have a reduced outer diameter (ODHL) at a crimped hot lock region, such as the case when the shell is used in smaller diameter spark plugs, such as M8 and M10 plugs. According to a non-limiting example, the spark plug shell steel material comprises 0.20-0.55 wt % carbon, inclusive.
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