商用车电驱动齿轮疲劳寿命优化方法研究

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中图分类号：U463 DOI：10.20042/j.cnki.1009-4903.2025.03.025

Abstract：Toaddress the issue of gear fatigue failure in the electric driveaxle transmission system of 6×4 electric heavy-dutytrucks underhightorqueandfrequentshitingconditions，thisstudyestablishesaloadinputmodelforrepresentativeoperatingcodions. BasedontheS-Ncurveof2OCrMTisteelandMiner’slineardamageaccumulationtheoryamuliconditionfatiguelifeevaluation method isdeveloped.Finiteelementsimulationsareemployed toidentifystress concentrationzonesatthegearroot，pinpointing regionsmostsusceptibletoftiguefailure.Subsequentlymutibjectivetructuraloptimatioapproachcombiningesponseuace methodologyadgeneticagoritisimplementedtofinegearmoduletoothumberratioandtipeliefoficent，trebyducing localstressandenhancingstructuraltrength.Benchtestsandrealroadtriasconfimthatheoptimizeddesignextendsgearfatigue life by 3.2 times，reduces gearbox noise by 4.6 dB，and lowers energy consumption per kilometre by 3.4% .The results demonstrate that theproposedptimizationmethodoffrssignificantengineeringeffectivenessandpracticalvalueinimprovinggearftigueresistance and overall drivetrain performance in commercial electric trucks.

Key words： Electric drive axle; Gear fatigue; Structural optimization; Finite element simulation; Heavy-duty truck

0 引言

随着新能源商用车技术快速发展，电驱桥已逐步取代传统动力系统成为 6×4 牵引类重卡的主流配置。（剩余5007字）