基于ANSYS的C-EPS中扭杆的改进

Improvement of Torsion Bar of C-EPS Based on ANSYS

转向柱式电动助力转向系统(C-EPS)集节能、低质量、低噪、结构紧凑等诸多优点被广泛应用于乘用车上。其输入轴与输出轴之间尺寸较小的弹性扭杆强度是影响转向系统总体强度和疲劳的关键件。根据实验数据应用CATIA软件建立扭杆以及与之相连的输入轴和输出轴的三维结构模型,并将模型导入Hypermesh进行网格的划分和边界条件的设置,将网格模型导入ANSYS workbench,对扭杆进行静力学及疲劳计算,再根据获得的数据对扭杆结构进行改进及分析,经疲劳试验台实验验证,改进后的结构更为合理。

Electric Power Steering has many advantages such as energy saving,low weight,low noise,compact structure and so on,so it is widely used in passenger car. The smal size torsion bar between the input shaft and the output shaft in the C-EPS structure is the key part which has influence on the overall strength and fatigue of the steering system. According to the experimental data,this paper uses CATIA software to establish 3 D structure model of the torsion bar which is connected with the input shaft and output shaft. And the model is introduced into Hypermesh which is used to divide the grid and set up the boundary conditions. Then the mesh model is imported into ANSYS workbench,which is used to do the static and fatigue calculation of the torsion bar. And then according to the obtained data,the torsion bar structure is improved and analyzed. Through the fatigue test-bed experiment,it is proved that the improved structure is more reasonable.