Flywheel ring gear assembly is the power delivered to the starter motor crank shaft fittings, main effect is to realize the power transfer between starter and crankshaft,
for engine inertia moment of inertia of the flywheel is a large disk, installed on the engine crankshaft back-end flange, flywheel on the outer pressure have a gear ring,
but with the starter motor gear mesh, At the same time behind it is a clutch joint.