The flywheel ring gear assembly is the connecting part that transmits the starter power to the crankshaft, the main function is to realize the power transmission between the starter and the crankshaft, and provides the inertial flywheel for the engine is a disk with a large moment of inertia installed behind the engine crankshaft On the end flange, a ring gear is pressed on the outer edge of the flywheel to engage with the drive gear of the starter, and behind it is a joint surface of the clutch.