Patent ID: 8485088
Filing Date: 2013-07-16
Classification: B21K,B23P,F02F,Y10T

Abstract:
1. A method for producing one-piece steel piston with a small compression depth for an internal combustion engine which encloses a cooling channel adjacent an annular region, the method comprising the steps of: forging a piston blank with an extended inner wall of the cooling channel, creating a cooling channel located between the annular region and a combustion chamber recess by reshaping the extended inner wall; an open end of the extended inner wall of the cooling channel assigned to the combustion chamber bowl and shaped as an annular section coacting with an outer piston wall as the result of being formed over; supporting the annular section on a stepped section of the outer piston wall; forming a bevel in the outer piston wall defining an open ended gap between an upper edge of the outer piston wall and the reshaped end of the open end of the extended inner wall; using the open gap to seal a resulting joint to close the cooling channel; and forming the piston with at least one cavity in a piston shaft wall below the annular region.