Ring Gear / DMF fly wheel

│Ring Gear│

As of the reduction gear of the car, I say the original gear plate no (arm) arm also boss (boss) of (shape)

│DMF fly wheel│

Is what is referred to as the inertia wheel, the rotational force of the crankshaft (torque), dirt, and also include steam engines, or internal combustion engine, in the mechanism the crank and the piston
dead center at both ends (dead point) some. In order to facilitate passing therethrough, and is used to average the rotational force. Thus, by thickening the surrounding wheel which is mounted to the crankshaft is relatively heavy.