| 摘要 |
PROBLEM TO BE SOLVED: To improve the output of an engine, by making the mixture gas start to be sucked to a crankcase at once from the intake port of the mixture gas, when the crankcase is started to be in a negative pressure by raising a piston from a bottom dead center, opening the above intake port perfectly by the piston in the vicinity of a piston top dead center, and increasing the intake of the mixture gas to the crankcase at a maximum amount. SOLUTION: An intake port 6 of the mixture gas furnishing a check valve 12 is formed on a cylinder inner wall 4a to be opened by a piston 7 in the vicinity of the top dead center of the piston 7, in order to feed a mixture gas of the fuel including a lubricating oil, and the air from a carburetor 5 to a cylinder 4, and a recessed groove 4b communicating with the suction port 6 is formed on the cylinder inner wall 4a, in order to generate a specific clearance between the piston 7, in the movement in other than the top dead center of the piston 7.
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