Patent ID: 6279455
Filing Date: 2001-08-28
Classification: F02F,F05C,Y10T

Abstract:
A two piece unitary piston, said two piece unitary piston defining an axis and comprising:a head member being made of a material having a preestablished material strength, having a bottom surface and an inner support portion defining a support surface;a skirt member being made of a material having a preestablished material strength being substantially the same as the preestablished material strength of said head member, having an upper outer support surface aligned with the bottom surface forming an interface and an inner support portion defining an upper inner support surface forming an interface and each of said interfaces being in contacting and supporting relationship with said bottom surface and said support surface of said head member respectively;at least one of said interface of said bottom surface and said upper outer support surface and said interface of said support surface and said upper inner support surface being oriented at an angle other than 90 degrees to said axis;said interface formed by said upper inner support surface being aligned with said support surface being joined by a welding process;said interface formed by said upper outer support surface being aligned with said bottom surface being joined by said welding process; anda piston cooling gallery being formed by said upper inner support surface and said support surface interface and said upper outer support surface being aligned with said bottom surface interface.