Power transmission shaft on the piston group of the crankshaft, connecting rod, the top (up) when the piston to the cylinder movement, crankcase produce negative pressure, air through the air filter, fuel with the carburetor.Through inhalation of crankcase inlet valve, when the department (down) to deviate from the cylinder piston movement, the gas is compressed in the crankcase, when scavenging port open, can sweep gas by airway pressure into the cylinder, piston upward movement again, combustible gas is compressed in the cylinder, pressure and temperature increase, the electric ignition burning, further improve the heated gas pressure, gas expansion, pushing the piston movement of the crankshaft rotates, output power, when the vent opening, after combustion of waste gas by pressure, first by scavenging air flow displacement sweep again out of the cylinder, the muffler exhaust closed, air intake, compression, expansion and exhaust, and the crankshaft will revolve to do work.
Crankshaft idle speed, the clutch is separated, the crankshaft is not drive shaft, meet the needs of the stop transmission shaft without downtime.When the crankshaft speed rise to clutch combine speed above, clutch, transmission shaft rotation, drive the machine work, the machine drive or park, fast or slow controlled by the throttle control.
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