PISTON FOR INTERNAL COMBUSTION ENGINE AND DEVICE FOR MANUFACTURING SAME

摘要

PROBLEM TO BE SOLVED: To reduce manufacturing cost and increase degree of freedom in a shape of a recessed part in a piston for an internal combustion engine casted and formed with having the recessed part opening on a crown surface on a crown part. SOLUTION: The recessed part 13 is formed by molds 22, 25 with inclining at least part of a circumference wall 13a of the recessed part 13 to form an under cut shape. COPYRIGHT: (C)2007,JPO&INPIT