PISTON AND METHOD OF MAKING A PISTON
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 14, 2013
filing date -
Mar 14, 2013
priority date (Note) -
Abandoned
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Abstract
A piston for an internal combustion engine is provided. The piston includes a pair of pin bosses formed of aluminum or an aluminum alloy spaced from one another in an axial direction. Each of the pin bosses has a generally circular opening for receiving a wrist pin. The pin bosses are formed integrally with surrounding areas of the piston, and each pin boss has a zone with increased hardness relative to the surrounding areas of the piston. The zone with increased hardness is at the inner periphery of the generally circular opening and resists deformation from forces between the piston and a wrist pin during operation of the internal combustion engine. Preferably, the zone with increased hardness has a dendritic microstructure with primary silicon crystallites dispersed throughout; are substantially free of pores and cracks; and have a Vickers Hardness Value of between 169 and 177.
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