关键词: 齿轮强度；耐久试验；混合动力变速箱；齿轮疲劳断裂；六西格玛设计

Abstract: In order to solve the problem of bending fatigue fracture of the main reduction gear of a hybrid transmission in bench endurance test, the failure cause was determined and three measures were implemented through CAE and test comparison and fracture analysis. The simulation model based on MASTA software has been updated through carefully taking stiffness of abnormal gear shaft into account. Effect of stiffness change along circumferential direction on the gear fatigue strength has been studied, and simulated gear contact pattern matched test result now. A test standard which is suitable for this hybrid transmission is build. Taking stiffness of abnormal gear shaft as noise, design for six sigma method is used to design a high robust gear pair. The way to consider abnormal shaft, the method to build new dyna test standard and the procedure to design gear in this paper can be meaningful to engineering application of gear design.

Key words: Gear strength; Endurance test; Hybrid transmission; Gear fatigue fracture; Design for six sigma