Abstract: As the core load-transmitting component of a commercial vehicle's chassis suspension system, the torque rod plays a critical role in transmitting longitudinal and lateral forces, suppressing axle displacement, and maintaining wheel alignment parameters. It is responsible for transferring push-pull balance forces and constraining side-bending torque to restrict axle movement, thereby enhancing the overall stability and rigidity of the chassis suspension. Traditional friction-welded torque rods suffer from issues such as excessive connection points, susceptibility to loosening, and heavy weight. To address this, this paper designs an integrated torque rod assembly structure. Under the premise of ensuring strength and reliability, this design reduces stress concentration. Compared with traditional tubular friction-welded structures, it eliminates welding defects between components, resulting in a more uniform stress distribution. This also increases fatigue resistance, improving the vehicle's driving stability, operational safety, and component service life. Through finite elementsimulation and fatigue durability experimental analysis, the stress distribution, modal characteristics, and fatigue life of the integrated torque rod under typical load spectra are simulated and verified. This provides a theoretical basis and engineering reference for the lightweight, high-reliability design of commercial vehicle suspension torque rods.

Key words: integrated thrust rod; chassis suspension system; handling stability; lightweight torque rod

摘要： 推力杆作为商用车底盘悬架系统的核心传力部件，承担着传递纵向/横向力、抑制车桥 位移、维持车轮定位参数的关键功能，负责传递推拉平衡力、侧弯扭矩约束车桥的运动，提 高悬架整体稳定性，提升底盘悬架整体刚性。传统的摩擦焊结构推力杆，存在连接点多、易 松动、质量大等问题，文章设计了一种一体式推力杆总成结构，在保证强度与可靠性的前提 下，降低应力集中现象，与传统的管状摩擦焊结构比较，其设计消除了摩擦焊零部件间组合 焊接缺陷，使得整体受力更加均匀，也增加了其抗疲劳性能，提高了车辆的行驶稳定性、操 控安全性与零部件使用寿命。通过有限元仿真和疲劳耐久实验分析，对一体式推力杆在典型 载荷谱下的应力分布、模态特性及疲劳寿命进行模拟验证，为商用车悬架推力杆的轻量化、 高可靠性设计提供了理论依据与工程参考。

关键词: 一体式推力杆；底盘悬架系统；操控稳定性；轻量化推力杆