Flywheel gear ring, flywheel gear ring structure and engine

The utility model relates to the field of engines, and discloses a flywheel gear ring, a flywheel gear ring structure and an engine, and the flywheel gear ring comprises arc units which are detachably connected to form an annular flywheel gear ring; any two adjacent arc-shaped units are connected through the connecting assemblies. According to the flywheel gear ring, an integral flywheel gear ring is not used, the mode that at least two arc-shaped units form the annular flywheel gear ring is adopted, in this way, the arc-shaped units are more convenient to transport, the connecting assemblies are additionally arranged at any two adjacent arc-shaped units to achieve fixation of the arc-shaped units, and when the flywheel gear ring needs to be installed on a flywheel, the flywheel gear ring can be installed on the flywheel conveniently. The flywheel does not need to be disassembled, each arc-shaped unit is directly installed on the flywheel, and the arc-shaped units are fixed through the connecting assemblies t