Patent ID: 7341037

Claim:
An engine piston comprising a prefabricated outer shell constructed as one piece of material, said shell including a crown centered on a longitudinal piston axis and a tubular side wall providing a piston skirt extending axially with respect to the periphery of the crown to an open end; and a prefabricated mounting member constructed as a separate piece of material from said shell and being within the tubular side wall of the shell, said mounting member carrying gudgeon pin bosses and extending transversely to the longitudinal piston axis, said mounting member interfacing with the crown at a radially extending interface, said interface providing an axial location reference, said mounting member interfacing with the side wall spaced from the crown and providing a transversely extending closure plate member substantially closing a peripheral chamber in the crown, the mounting member being bonded permanently to the crown at said radially extending interface and bonded permanently to the side wall at an axially extending peripheral interface.