Flywheel is a disk with a large moment of inertia. Its main function is to store part of the kinetic energy input to the crankshaft in the power stroke, so as to overcome the resistance in other strokes,

Flywheel effect refers to that in order to make the stationary flywheel rotate, you must make a lot of force at the beginning, push it repeatedly in circles, and every turn is very laborious,

At the power output end of the crankshaft, that is, the side connecting the gearbox and the working equipment. The main function of flywheel is to store the energy and inertia outside the power stroke of engine.