摩擦激励与多边形效应耦合作用下的链式CVT传动失稳机理研究

链式无级变速器(链式CVT)传动过程中，传动副摩擦激励与链条多边形效应相耦合，所诱发的载荷振荡、结构共振及传动噪声等失稳行为，是制约其平顺性和可靠性提升的瓶颈性问题。为此，项目依据摩擦学和动力学理论，探究链式CVT传动失稳行为的产生机理、影响因素及抑制技术。内容包括：①研究链式CVT摩擦副接触、润滑和摩擦特性，辨识摩擦副接触刚度、油膜阻尼、摩擦因数与工况参数的关联规律；②分析链传动总成系统动力学特性，揭示摩擦激励与多边形效应的耦合作用对链式CVT传动性能的影响机制；③明确传动失稳行为的表征指标和临界工况条件，构建链式CVT动力学稳定运行参数空间；④优化链条结构、润滑参数及控制参数，发展链式CVT传动失稳抑制技术。相关研究有望解决链式CVT易发生传动失稳的问题，为自主链式CVT平顺性和可靠性设计提供基础技术支撑。

During the transmission process of Chain Continuously Variable Transmission (Chain CVT), frictional excitation is coupled with the polygon effect, which induces instability behaviors such as system load oscillation, structural resonance, and transmission noise. It is the bottleneck problem that restricts its smoothness and reliability improvement. To this end, this project is based on tribology and dynamics theory to explore the mechanism, influencing factors and suppression methods of Chain CVT transmission instability behavior. The contents include: ①Research on the contact, lubrication and friction characteristics of the Chain CVT friction pair, identify the mapping relationship between the contact stiffness, oil film damping, friction factors and working condition parameters of the friction pair; ②Analyze the dynamic characteristics of the chain drive assembly and reveal the influence mechanism of the coupling effect of friction excitation and polygon effect on the Chain CVT transmission performance; ③Clarify the characterization indexes and critical working conditions of the transmission instability behavior, and construct the dynamic stable operation parameter space of the Chain CVT; ④Optimize chain structure, lubrication parameters and control parameters, and develop Chain CVT drive instability suppression technology. Related research is expected to solve the problem of Chain CVT prone to transmission instability, and provide basic technical support for the design of autonomous Chain CVT ride comfort and reliability.