In addition, the crankshaft bears the maximum load and all the power in the engine, the bending moment and torque which are constantly changing in the strong direction, and the wear of high-speed running for a long time. The fillet transition is in the weak link, and the transition between the main journal and the fillet is more serious. In the working process of crankshaft, the reciprocating inertia force and centrifugal force make it bear great bending torsion stress, the surface of journal is easy to wear, and the transition fillet between journal and crank arm is the weakest. In addition to the material and processing factors of crankshaft, the working conditions (temperature, environmental medium, load characteristics) of crankshaft are important factors affecting the service of crankshaft. Therefore, appropriate materials and heat treatment process are needed to ensure that it can meet the required performance indexes.<br>
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