车辆方向盘自主回正系统机械部分的建模与分析

Modeling and Analysis of Mechanical Parts of Autonomous Steering Wheel Return System for Vehicles

为验证车辆静态下方向盘自主回正系统中机械结构部分设计的可行性,本课题采用SolidWorks对车轮以及电动助力转向系统中(EPS)的(齿轮齿条)转向器进行三维建模分析,计算出了车辆方向盘自主回正状态下横拉杆至少要提供228.58 Nm的转向力矩,通过力矩公式可得齿轮齿条扭矩为18.10 Nm,再对其进行有限元分析,得出该齿轮齿条在相应扭矩作用下的最大应力值为7.575e 08 Pa,最大位移量为3.194e−01 mm,最大应变量为1.896e−03,均在可承受范围内,故该设计是合理的。

In order to verify the feasibility of the design of the mechanical structure part of the autonomous steering wheel return system under the static condition of the vehicle, this project adopts SolidWorks to analyze the three-dimensional modeling of the wheels as well as the (rack-and-pinion) steering gear of the electric power steering system (EPS), and calculates that the cross-tie bar under the autonomous steering wheel return state of the vehicle has to provide the steering torque of at least 228.58 Nm, which can be obtained by the torque equation. The torque of the rack and pinion is 18.10 Nm, and then the finite element analysis is carried out, and it is concluded that the maximum stress value of the rack and pinion under the corresponding torque is 7.575e 08 Pa, the maximum displacement is 3.194e−01 mm, and the maximum strain is 1.896e−03, all of which are in the tolerable range, and therefore the design is reasonable.