Finite element analysis of a vehicle diesel engine crankshaft

The crankshaft is the largest moving part in the engine and one of the most important parts in the engine. It bears the force transmitted from the connecting rod and converts this force into torque. The working conditions of the crankshaft are harsh, and its stress conditions are quite complicated. The stress concentration phenomenon is quite serious under the effect of bending and torsion loads, especially in the rounded transition area from the crank to the journal. In addition, the crankshaft has a significant impact on the overall size, weight, reliability, and manufacturing cost of the engine Therefore, the fatigue strength, stiffness, and wear resistance of the journal must be strictly checked and analyzed during the design of the crankshaft. In this paper, the finite element method is used as the main research method to analyze the static strength of a diesel engine crankshaft. The pre-processing software is used to optimize the topology of the crankshaft 1/2 single turn and the tetrahedral meshing. Then the finite element analysis software is imported to set the boundary Condition and apply the load, and finally submit the calculation. According to the working conditions, the crank pin load and the main journal support reaction force are calculated. Through the analysis of the results of crankshaft statics simulation, the weak links of the stress distribution of the crankshaft under dangerous conditions are found, which provides a theoretical basis for the structural design of the crankshaft.