| 摘要 |
PURPOSE:To improve the heat reduction of a piston and the efficiency of filling in the end of exhaust stroke by forming an exhaust hole cooling water path on the outer periphery of the exhaust hole in a crank case compression type 2 cycle engine. CONSTITUTION:An exhaust hole in a cylinder of a 2 cycle engine is provided on the outer periphery with a cooling water path 13 at the underside of an exhaust path, a communicating path 14 at the side of the exhaust path, a cooling water path 15 at the upperside of the exhaust path, etc. and further on the periphery of a scavenging port with a scavenging path cooling water path 18. Thus, even if the top of a piston is heated in the end of exhaust stroke, the temperature of peripheral wall of the cylinder is lowered to improve the heat reduction of the piston and the efficiency of filling fresh air while the rise of scavenging temperature is restrained to block the reduction of weight of filled fresh air.
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