ENGINE AND ENGINE-POWERED TOOL EQUIPPED WITH SAME

摘要

The engine (1) has a combustion chamber (4) defined by wall surfaces (5 and 20) of the cylinder bore (3) and the top surface (24) of a piston (9) that reciprocates in the cylinder bore (3) between an upper dead point and a lower dead point. A plurality of protuberances (6) are integrally formed in the upper wall surface (5) of the cylinder bore (3) facing the top surface (24) of the piston (9).