Patent ID: 8807109
Filing Date: 2014-08-19
Classification: F02F,Y10T

Abstract:
1. A piston for an internal combustion engine, comprising: a top part having an uppermost surface with annular inner and outer upper joining surfaces 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 a pair of upwardly extending annular inner and outer lower joining surfaces joined by separate respective inner and outer weld joints to said inner and outer upper joining surfaces with an annular cooling gallery formed radially between said upper joining surfaces and radially between said lower joining surfaces, said bottom part having a combustion bowl wall recessed below said uppermost surface, said combustion bowl wall having an upper apex and an annular valley surrounding said upper apex and a lower apex underlying said upper apex; and wherein said inner weld joint is substantially coplanar with said lower apex.