中空组合式凸轮轴滚花连接强度研究

Research on the knurling connection strength of hollow assembled camshaft

凸轮与轴体的连接强度是评价中空组合式凸轮轴的重要技术指标.本文介绍了中空组合式凸轮轴的技术优势和滚花连接的特点,通过有限元数值模拟并结合试验对滚花装配压装力和连接强度的影响因素进行了分析.结果表明,材料、过盈量、滚花连接区长度、滚花齿形和齿间距都是影响滚花压装力和连接强度的主要因素;凸轮与轴体材料的优化匹配、滚花齿形的合理选取以及装配过盈量和连接区长度的增大,都可提高滚花连接中空组合式凸轮轴的连接强度.

The key qualification of hollow assembled camshaft is connection strength between cam lobes and shaft. The connection mechanism and technical advantages of hollow assembled camshaft on knurling connection are introduced. The influencing factors of knurling connection strength and press-fit load are analyzed by FEM numerical simulation, press-fit experiments, static torque strength experiments and fatigue strength experiments. Results show some that the cam lobes,tube materials, interference, knurling width, knurling form and teeth space influence the press fit load and connection strength of knurling connection. In addition,the connection strength between cam lobes and shaft is increased by the optimized choice of cam lobes and tube material and proper manufacture of knurling form or augment of interference and knurling width.