Patent ID: 9334958
Filing Date: 2016-05-10
CPC Classification: B21K,F02F,F05C,F16J,Y10T

Claim Text:
1. A piston comprising: a lower crown; an upper crown joined to said lower crown, said upper crown being fabricated of a metal material and having a complex shaped combustion bowl on an upper side thereof and an oil gallery channel on a lower side thereof, wherein said oil gallery channel has a corresponding complex shape and includes a machine-formed circular radially outward wall surface and a radially inward wall surface, said radially inward wall surface having substantially the same complex-shaped configuration as said combustion bowl, and said radially inward wall surface having first machine formed portions and second as-formed portions, wherein said machine-formed circular radially outward wall surface extends axially above all of said radially inward wall surfaces, and wherein said radially inward wall surface comprises multiple radially inward recessed as formed portions separated circumferentially from one another by intervening sections of machine-formed wall surface portions.