一种新型大扭矩CVT的传动性能  

Research on transmission performance of a novel CVT with high-torque

作　　者：张庆功[1] 李华[2] 姚进[2] 喻俊馨[1] 

机构地区：[1]西华大学机械工程与自动化学院,四川成都610039 [2]四川大学制造科学与工程学院,四川成都610065

出　　处：《武汉大学学报（工学版）》2015年第6期857-861,866,共6页Engineering Journal of Wuhan University

基　　金：四川省重点实验室开放研究基金资助项目(编号:szjj2013-039);西华大学自然科学重点基金项目(编号:Z1410211)

摘　　要：针对某新型CVT机构,提出了由输入扭矩分矩比、输入功率分流比、输出输入扭矩比和输出输入转速比组成的评价系统传动性能的指标体系.通过分析定轴轮系传动比、双排差动轮系转换机构传动比的变化对各性能指标的影响,得出了有利于系统性能指标朝期望目标变化的定轴轮系传动比、双排差动轮系转换机构传动比的变化趋势.使用求导数的方法研究了各性能指标关于无级变速单元传动比的变化规律.建立了输入扭矩分矩比小、输出输入扭矩比大的多目标优化数学模型,采用线性加权法和Fmincon函数得到了多目标优化的非劣解.最后绘制了非劣解下的输入扭矩分矩比、输出输入扭矩比关于无级变速单元传动比的曲线.结果表明,新型CVT机构不仅能够承受较大的输入扭矩,而且具备更大的扭矩输出.For a novel continuously variable transmissions （CVTs） mechanism, the index system to evalu- ate the transmission performance was established, which was composed of the split-torque ratio of input torque, the split-power ratio of input power, the ratio of output torque to input torque and the ratio of out- put speed to input speed. By analyzing that how the transmission ratio variation of the fixed-axis gear train and the shifting mechanism of the double-row differential gear train influenced on the performance indica- tors, the variation trends of the transmission ratio of the fixed-axis gear train and the shifting mechanism of the double-row differential gear train, which helped to adjust the performance indicators towards the ex- pectation objectives, were obtained. Using derivation method, the changes of the performance indicators on the transmission ratio of continuously variable unit （CVU） were researched. Aiming at smaller split- torque ratio of input torque and bigger ratio of output torque to input torque, a mathematic model of multi- objective optimization was built. A non-inferior solution of the multi-objective optimization model was got- ten by using linear weighting method and Fmincon funciton. Finally, the curves for the split-torque ratio of input torque and for the ratio of output torque to input torque with respect to the transmission ratio of CVU under the non-inferior solution were drawn. The results show that the novel CVT mechanism can not only bear bigger input torque but also output much higher torque.

关 键 词：无级变速器 传动比 性能指标 参数优化 

分 类 号：TH132[机械工程—机械制造及自动化]