Chainsaw is of course an important power source of gasoline, of course, the main role is still used to cut wood. Senwart Chainsaw power part of the gasoline engine, chainsaw engine body is the main part of the power generation, it directly determines the chainsaw power capacity and duration of use, chainsaw engine body mainly consists of cylinders, pistons, connecting rods, crankshafts, crankcase and flywheel and other components.

1. Cylinder

Cylinder is for the piston in its movement of a cylinder, the combustion of the mixture burst in this place. In order to increase the wear resistance of the cylinder wall and increase the heat dissipation of the cylinder, the cylinder in general are aluminum alloy castings, chrome-plated walls. The upper part of the cylinder is the main workplace of the chainsaw engine, so the upper part of the cylinder wears faster, and at the same time, the connecting rod in the cylinder movement is swinging from side to side, the left and right sides of the wear and tear. Wear to a certain extent, then the cylinder will be scrapped.

2. Piston

Piston bear chainsaw engine working gas pressure, do reciprocating motion, and through the connecting rod will convey the pressure to the crankshaft mechanism. At the same time, driven by the connecting rod and crankshaft (by inertia) to complete the intake, compression and exhaust work. Piston engine piston top more for the arc shape, in order to facilitate the flow of the mixture, the upper part of the piston is subjected to higher temperatures, so the manufacture of the upper part of the diameter than the lower part of the diameter is smaller, to do for the expansion of the amount of retention. In order to ensure that the piston and cylinder wall surface of the close combination to ensure that the compression is good, in the piston on the ring groove in 2-4 piston ring, the opening gap of 0.10-0.15mm, as the expansion of the amount of retention.

3. Connecting rod

Connecting rod is used to connect the piston with the engine crankshaft, the piston is subjected to gas pressure to the crankshaft, and the reciprocating linear motion of the piston into the crankshaft rotary motion. Connecting rod small head and piston connection, large head and crankshaft connection.

4. Crankshaft

Crankshaft with the help of cylinders, pistons and connecting rods will change the linear motion of the piston into rotary motion. At the same time, it can also promote the piston, so that its reciprocating linear motion. In order to simplify the manufacture of the crankshaft, the crankshaft of the chainsaw engine is composed of two half-shafts, two crank garden machinery handle arm and a crank pin. The ends of the half shafts and the crank pin are pressed into the crank arm and finally connected to form the crankshaft. The crankshaft is normally mounted in the crankcase with the aid of ball bearings.

5. Flywheel

The basic function of the flywheel is to keep the engine running in a balanced manner. In addition, the flywheel makes the engine easy to start. At the beginning of the stroke, the crankshaft's rotational energy is stored, and when the piston passes the ignition, the upper dead center, and the mixture is compressed to the maximum, the flywheel releases the energy so that the crankshaft continues to rotate.

6. Crankcase and Flywheel housing

Crankcase is the base of the engine, above the installation of engine components and parts, such as cylinders, ignition devices. Two-stroke chainsaw engine crankcase in addition to the rotating parts of the engine for its rotation, but also play the role of the air pump. In order to maintain a certain pressure in the body, to avoid the body of the mixed fuel or vapor run out, between the crankshaft and shaft box There are oil seals. The outside of the flywheel has a flywheel shell, play a protective role, the outside of the flywheel shell has a spiral conduit, is a part of the chainsaw engine cooling system, therefore, the flywheel shell is also the shell of the blower.

Here should be a more detailed introduction, some of the theoretical knowledge about the chainsaw engine can be understood.