Flywheel (flying wheel), a disc-shaped part with a large moment of inertia, functions like an energy storage. For a four-stroke engine, work is done once every four piston strokes, that is, only the power stroke does work, and the exhaust, intake and compression strokes all consume work. Therefore, the external output torque of the crankshaft changes periodically, and the crankshaft speed is also unstable. In order to improve this situation, a flywheel is installed at the rear end of the crankshaft.
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