Pistons made using additive manufacturing techniques

摘要

PROBLEM TO BE SOLVED: To cost-effectively provide a monoblock piston body for an internal combustion engine. A piston body (20) includes a first piece including a pair of skirt portions (24) and a pair of pin bosses (26) and a second portion including a crown portion (22) having an upper combustion surface and an at least partially enclosed oil gallery. Including pieces and. The first and second pieces are joined together at a joint located on the side of the oil gallery 32 opposite the upper combustion surface. The first piece is made by casting or forging and the second piece is made by an additional manufacturing process such as direct metal laser sintering. [Selection diagram] Fig. 7