Patent ID: 8662026

Claim:
A piston for an internal combustion engine, comprising: a body extending along a longitudinal central axis, said body including an upper combustion wall providing an upper combustion surface, a cylindrical outer wall with a ring belt region depending from said upper combustion surface, a pair of pin bosses beneath said upper combustion wall; a first cooling gallery in radial alignment with said ring belt region, said first cooling gallery having an upper wall adjacent said upper combustion surface and a lower wall; a cooling medium contained in said first cooling gallery; and an insert member fixed to said body, said insert member being spaced axially beneath said lower wall and bounding a second cooling gallery between said insert member and said lower wall of said first cooling gallery, said insert member having an inlet opening configured to allow oil to flow into said second cooling gallery against said lower wall of said first cooling gallery and an outlet opening configured to allow the oil to flow outwardly from said second cooling gallery.