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PISTON WITH WELD HARDENED RING GROOVE AND METHOD OF CONSTRUCTION THEREOF

  • US 20120304956A1
  • Filed: 06/06/2011
  • Published: 12/06/2012
  • Est. Priority Date: 06/06/2011
  • Status: Abandoned Application
First Claim
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1. A piston for an internal combustion engine, comprising:

  • a top part having an uppermost surface with annular outer upper joining surface depending from said uppermost surface;

    a bottom part having a pair of pin bosses providing a pair of laterally spaced pin bores aligned with one another along a pin bore axis and having an upwardly extending annular outer lower joining surface;

    a friction weld joint bonding said upper joining surface to said lower joining surface; and

    wherein at least one of said top part and said lower part has an annular ring groove configured for receipt of a piston ring, said ring groove having a thermally hardened surface within a heat affected zone of said friction weld joint.

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