摩擦式自动张紧器的设计与优化

Design and optimization of friction automatic tensioner

以某型柴油机附件传动系统作为研究对象,分析附件传动系统主要零部件张紧器卡滞现象的产生机理。建立该摩擦式自动张紧器在静态激励下加载和卸载时库伦摩擦扭矩曲线的计算模型,分析张紧器摩擦力矩和弹簧力矩在卡滞现象中的作用。开展张紧器对照试验,通过张紧器在衰减弹簧刚度、较大弹簧刚度和高摩擦力矩情况下的运动表现,研究卡滞现象的原因。通过建立摩擦式自动张紧器的参数化模型,提供了优化张紧器弹簧刚度和摩擦力矩的设计途径,对防止摩擦式自动张紧器卡滞具有参考价值。

Taking the accessory drive system of a diesel engine as the research object,the mecha⁃nism of the main component⁃tensioner stucking was analyzed.The calculation model of Coulomb friction torque curve of the friction automatic tensioner was established when the tensioner was loaded and unloa⁃ded under static excitation,and the effects of the friction torque and spring torque of the tensioner on the stuck phenomenon were analyzed.The tensioner control group test was carried out,and the cause of the stuck phenomenon through the motion performance of the tensioner under the condition of attenuated spring stiffness,large spring stiffness and high friction torque was studied.By establishing the parametric model of the friction automatic tensioner,a design approach to optimize the spring stiffness and friction torque of the tensioner is provided,which can prevent the tensioner from being stuck.