某商用车变速器传动效率偏低原因分析及改进

Cause Analysis and Improvement on Low Efficiency of A Commercial Vehicle Transmission

以某变速器在产品开发过程中遇到的传动效率偏低问题为例,通过与对标样件试验数据对比分析,确定与载荷相关的损失偏大是导致该变速器效率偏低的主要因素。建立齿轮和轴承功率损失的数学模型,从齿轮参数及轴承选型的角度分析该变速器效率偏低的原因。利用遗传算法对齿轮参数进行优化设计,并更改轴承类型。改进后的试验结果表明,变速器效率提高了0.55%~0.70%,达到了对标变速器的效率水平。

In the product development, the problem of low transmission efficiency of a transmission was taken as example. By comparison with the test data of benchmarked transmission, the main factor that leads to the low efficiency of the transmission is bigger load-dependent loss. The mathematical model of gear and bearing power loss was established, the cause of low efficiency was analyzed in term of gear parameters and bearing selection. The parameters of the gear were optimized using genetic algorithm, and the bearing type was changed. The optimized test results showed that, transmission efficiency is increased by 0.55%-0.70%, meeting the transmission efficiency of the benchmarked transmission.