Simple Definition of flywheel
: a heavy wheel that is part of a machine and that controls the speed of machinery
Full Definition of flywheel
: a heavy wheel for opposing and moderating by its inertia any fluctuation of speed in the machinery with which it revolves; also : a similar wheel used for storing kinetic energy (as for motive power)
Did You Know?
A heavy wheel attached to a rotating shaft, a flywheel smooths out delivery of power from a motor to a machine. The inertia of the flywheel moderates fluctuations in the speed of the engine and stores the excess energy for intermittent use. In automobile engines, the flywheel smooths out the pulses of energy provided by combustion in the cylinders, and provides energy for the compression stroke of the pistons. In power presses, the punching, shearing, and forming are done in a fraction of the operating cycle. During the rest of the cycle, the speed of the flywheel is built up by a comparatively low-powered motor, and most of the required energy for the cycle is provided by the flywheel.
First Known Use of flywheel
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