液压压紧式牵引传动装置的滑动特性

研究了液压压紧式牵引传动装置的变速原理,以及内、外摩擦副的牵引系数与传动比之间的变化规律,探讨了该传动装置的滑动特性分析方法.基于弹流动力润滑理论建立了传动装置牵引特性计算模型与研究方法,分析了不同滑滚比和法向压紧力下摩擦副的功率特性,在此基础上推导出了传动装置输入功率、输出功率与总滑动率的关系.结果表明:在同一滑动率下,液压压紧式牵引传动装置的传动功率随着法向压紧力的增加而增大,当剪切应力接近极限剪切应力时传动功率趋于稳定；在同一法向压紧力下,传动功率随着滑动率的增加呈现先增大后减小的趋势；在传递相同功率时,可通过增大法向压紧力来减小滑动率,以提高传动效率.

Sliding Characteristics of Traction Drive Device Under Hydraulic Pressing

In this paper,the transmission principle of the traction drive device under hydraulic pressing was analyzed,and the variations of the traction coefficients of the inner and outer friction pairs with the transmission ratio were explored.Then,a method to analyze the sliding characteristics of the traction drive device was investigated.Moreover,a mathematical model and a method to investigate the transmission traction characteristics were proposed based on the elasto-hydrodynamic lubrication theory,which were then used to explore the power characteristics of the friction pairs under different slide-roll ratios and normal pressing forces and to obtain the input and output powers at different total sliding rates.The results show that(1) at a constant sliding rate,the transmission power of the traction drive device under hydraulic pressing increases with the normal pressing force and tends to a constant when the shear stress approaches the ultimate value;(2) under a constant normal pressing force,the transmission power first increases and then decreases with the increase in the sliding rate;and(3) at a constant transmission power,the sliding rate decreases with the increase in the normal pressing force,which may result in high transmission efficiency.