The gasoline saw is generally composed of an engine, a transmission mechanism, and a sawing mechanism. During operation, the power drives the saw chain through the traditional mechanism, so that the saw chain moves continuously along the guide plate to cut wood.

Engine: Generally a single-cylinder air-cooled two-stroke high-speed gasoline engine. In order to adapt to the operation of the chain saw in different positions in different cutting directions, a pump diaphragm carburetor with an oil pump is used, and the diaphragm pump oil is driven by the pressure pulsation in the crankcase, so that the engine can supply oil normally at any position . In addition, new structures such as transistor non-contact magneto ignition system and one-way valve air intake system are increasingly widely used, thereby improving the performance of the engine.

Transmission mechanism: including centrifugal friction clutch and reducer. The reducer generally adopts a conical wheel reducer, which is convenient for horizontal and vertical adjustment of the sawing mechanism relative to the machine body to meet the needs of different sawing directions during logging and timber making.

Saw wood mechanism: It is the working part of the chain saw, including the driving sprocket, saw chain, guide plate, saw chain tensioning device and wood inserting teeth.

For gasoline saws, the future development trend will be to adopt new materials, new processes, and new structures to further reduce the weight of the chain saw; reduce noise and vibration, reduce air pollution, and improve operating conditions; add safety protection devices to increase use Reliability and safety, and will continue to improve the new chain saw and remote powered by a rotary engine.