| 摘要 |
PROBLEM TO BE SOLVED: To prevent a damage due to thermal stress of a cylinder containing a plurality of exhaust ports in a cylinder of a two-cycle internal combustion engine.SOLUTION: In a two-cycle internal combustion engine containing a plurality of exhaust ports 10a formed in a cylinder block 3, a reinforcing wall 12 between a plurality of exhaust ports has a temperature increased by exhaust of combustion gas and expands in a reciprocating direction of a piston. When a temperature in the vicinity of the exhaust port is reduced, the reinforcing wall shrinks. In this state, the expansion and shrinkage of the reinforcing wall in the reciprocating direction of the piston are not hindered by providing a slit 21 in a cylinder block or cylinder liner. |
