Engine crankshaft flywheel shaft system structure

The engine crankshaft flywheel shaft system structure comprises a crankshaft assembly and a flywheel assembly connected to one end of the crankshaft assembly, and the crankshaft assembly comprises a main journal, a connecting rod journal and a crank. The cranks comprise a first crank, a second crank, a third crank, a fourth crank, a fifth crank, a sixth crank, a seventh crank and an eighth crank which are respectively connected between the main journals and the connecting rod journals which are adjacent, and the first crank, the fourth crank, the fifth crank and the eighth crank are respectively fan-shaped balance blocks; the second crank, the third crank, the sixth crank and the seventh crank are short connecting blocks connected to the main journal and the connecting rod journal respectively, and the flywheel assembly is composed of a flywheel and a starting gear ring integrated on the flywheel. According to the crankshaft flywheel shaft system, the weight of the crankshaft flywheel shaft system can be grea