According to the demands of continuously variable transmission(CVT)'s clamping force control strategy for CVT's reliability,a durability test bench is designed.In consideration of the characteristics of the speed shifiting mechanism and traditional clamping force control during sliding transmission,a clamping force test bench is devel-oped based on the method of using mechanical limit to fix the speed ratio.Based on the principle of metal strip slip and the results of friction coefficient test,the failure chart of the transmission mechanism is plotted with the help of Matlab,and the lurbricating oil selection standard for CVT is given.A real vehicle with CVT is tested on the road of 30000km to compare the metal ion contents in lubricating oil before and after the road test,and the inside com-ponent aging is predicted by using the iron spectrum method,resulting in the predicting error rate of only 1.02%. The simulation verified the effectiveness of the test bench.It has the better stability and robustness when testing CVT's reliability.%根据带式无级变速器(CVT)夹紧力控制策略对CVT可靠性的要求,设计了CVT耐久性测试试验台.结合滑摩传动时变速机构失效及传统夹紧力控制特点,利用机械限位固定速比的方式开发了夹紧力试验台.根据金属带滑移的工作原理及摩擦系数测试结果,借助Matlab绘制了变速机构失效图,并给出了变速器润滑油的选取标准.最后,进行3×104km道路实车试验,对比试验前后润滑油内金属元素含量;使用铁谱分析方法预测变速器内零部件早衰,误差仅为1.02%.结果表明:采用耐久测试试验台对变速器可靠性的评价具有一定试验支持,具有较好的鲁棒性和稳定能力.
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