| 摘要 |
PURPOSE:To stabilize a condition of combustion by providing a supersonic vibrator in an exhaust passage positioned at least on the underside relative to a cylinder so as to equalize density of a mixed gas. CONSTITUTION:Carburetors 14A, 14B are connected to crank chambers 12A, 12B composed of a crank case 6 and a cylinder block 1 through intake pipes 13A, 13B with built-in reed valves. Supersonic vibrators 21A, 21B are arranged in the middle part of an outlet port side as the lowest level of underrunning gas passages 18A, 18B. When an engine is kept long in idling or trolling, mixed gas supplied from the carburetors 14A, 14B into crank chambers 12A, 12B is liquefied through its touch with the crank case 6 and a crankshaft 7 of low temperature. The abovementioned fuel collected in the underrunning gas passages 18A, 18B is atomized by the supersonic vibrators 21A, 21B and equalizes density of the mixed gas in the cylinder. |
