PISTON WITH WELD HARDENED RING GROOVE AND METHOD OF CONSTRUCTION THEREOF
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
Jun 6, 2011
filing date -
Jun 6, 2011
priority date (Note) -
Abandoned
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Abstract
A piston and method of construction is provided. The piston includes a top part and a bottom part fixed to one another. The bottom part includes a pair of pin bosses providing a pair of laterally spaced pin bores aligned with one another along a pin bore axis. A friction weld joint bonds the top part to the bottom part. The top part and/or the lower part has an annular ring groove configured for receipt of a piston ring, wherein the ring groove has a thermally hardened surface formed by a hardened region of the heat affected zone.
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