Patent ID: 8863718
Filing Date: 2014-10-21
Classification: F02F,F05C,Y10T

Abstract:
1. A piston for an internal combustion engine, comprising: an upper crown constructed as a monolithic piece of a 400 series or 600 series stainless steel having a thermal conductivity within a range of about 7 to 25 W/m-K, said upper crown having an upper combustion surface with an upper land depending therefrom, said upper land having at least one annular ring groove configured for receipt of a piston ring; and a lower piston portion welded directly to said upper crown, said lower piston portion being constructed of a low grade steel alloy material having a thermal conductivity higher than said upper crown, said lower piston portion having a pair of pin bosses providing a pair of laterally spaced, axially aligned pin bores.