| 摘要 |
An inner mold for molding a cylinder having a bore-forming core for forming a cylinder bore, and a shell core for forming a recess in the cylinder that can serve as, for instance, a scavenging passage. Holes are formed in the bore-forming core for allowing the shell core to fittingly engage with the bore-forming core, and the bottom surfaces of each of the holes are arcuately concaved. |
