Patent ID: 8240039
Filing Date: 2012-08-14
Classification: B21K,B23P,F02F,F16J,Y10T

Abstract:
1. A method for producing a piston for an internal-combustion engine, the piston including a crown having an annular cavity for flowing cooling liquid therethrough and a skirt, the method comprising the steps of: forming the crown and the skirt individually; forming an annular groove for the annular cavity in the crown and an annular rib adjacent an opening of the annular groove; bending the rib toward the opening of the annular groove by application of pressure to close the opening of the annular groove to thereby form the annular cavity; and joining the crown and the skirt together to form a burr adjacent joined surfaces of the crown and the skirt, the burr creating a seal between the rib and the crown, thereby sealing the annular cavity.