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

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