高强化柴油机主轴承壁结构优化研究

Main Bearing Wall Optimization Study on a Highly-Strengthened Diesel Engine

某高强化柴油机机体疲劳试验发现:机体主轴承壁发生断裂故障,裂纹起始位置主要为第2档主轴承壁螺纹孔根部。针对此故障,采用有限元法进行主轴承壁疲劳强度计算,并进行螺纹子模型计算,根据计算分析结果,优化机体主轴承壁结构。结果表明:螺纹子模型仿真分析方法可以有效评估主轴承壁结构强度;螺栓尾部变形过大是造成主轴承壁断裂的主要原因,在一定范围内增加主轴承螺栓旋和长度可以有效解决主轴承壁断裂问题。

A Highly-Strengthened diesel engine fatigue test found that:Fracture failure appeared in main bearing wall of the block,the fracture position is mainly in the second main bearing wall.For the fault,the finite element method is used for the main bearing wall fatigue strength calculation and submodel of screw thread calculation.According to the results of calculation and analysis,optimize the main bearing wall structure of the block.The results show that,submodel of screw thread simulation method can effectively evaluate the main bearing wall structure strength.Bolt tail excessive stiffness are the main cause of the main bearing wall fracture.Increase the main bearing bolt screw can effectively solve the problem of main bearing wall fracture.