一种新型大转矩传输CVT的性能分析与参数优化

Performance Analysis and Parameters Optimization of a Novel CVT with High-Torque Transmission

针对某新型CVT机构,提出以输入转矩分矩比、输入功率分流比、输出输入转矩比和速比变化宽度为指标的传动性能评价体系;分析有利于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;建立以两传动比为变量,以输入转矩分矩比小、输出输入转矩比大、速比变化宽度大为目标的数学模型,采用线性加权法和Fmincon函数得到多目标优化的非劣解。最后绘制非劣解下输入转矩分矩比、输出输入转矩比的曲线,并计算相应的速比变化宽度。结果表明,非劣解下的新型CVT机构具有大转矩输出、变速范围宽的特点。

For a novel continuously variable transmissions（ CVTs） mechanism,evaluation system of the transmission performance is put forward,whose indicators are the split-torque ratio of input torque,the split-power ratio of input power,the ratio of output torque to input torque and the variable width of speed ratio. 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 expectation objectives,were analyzed. The mathematical models characterizing the smaller split-torque ratio of input torque,the bigger ratio of output torque to input torque and the bigger variable width of speed ratio were developed,with these two transmission ratios considered as design variables. A non-inferior solution of the multi-objective optimization model was produced,by using the linear weighted method and Fmincon function. The curves on the split-torque ratio of input torque,the ratio of output torque to input torque were drawn under the non-inferior of these two transmission ratios. The corresponding variable widths of speed ratio were calculated. The result shows that the novel CVTs mechanism has the features of high output torque and large output speed range.