Abstract: In order to reduce the fatigue risk of helical Torsen differential gear train, the influence of helical angle and pressure angle on gear meshing stress are investigated by finite element method. The simplified three-dimensional models of differential gear train with different helical angle and pressure angle are established, the mapped mesh method and frictionless contact behavior are adopted, and the static stress distribution of the gear train at different meshing positions are calculated. According to statistics, when the pressure angle remains unchanged and the helical angle increases, the maximum meshing stress of the gear train decreases from 564 MPa to 350 MPa. When the helical angle remains unchanged and the pressure angle increases, the maximum meshing stress of the wheel train decreases from 573 MPa to 478 MPa, so increasing the helical angle and pressure angle can reduce the meshing stress of the helical gear train of Torsen differential.

Key words: Helical gear Torsen differential; Meshing stress; Helical angle; Pressure angle

摘要： 为了降低斜齿托森差速器轮系齿面疲劳风险，采用有限元方法探索了斜齿轮螺旋角和 压力角对齿轮啮合应力的影响规律。建立了具有不同螺旋角和压力角参数的差速器轮系的简 化三维模型，划分六面体映射网格，设定轮齿接触面为无摩擦接触状态，计算轮系在一齿转 角周期内位于不同啮合位置的静态应力分布。统计各轮系的最大啮合应力随螺旋角和压力角 的变化规律可得，压力角不变，螺旋角增大时，轮系最大啮合应力从 564 MPa 降到 350 MPa； 螺旋角不变，压力角增大时，轮系最大啮合应力从 573 MPa 降到 478 MPa，所以增大螺旋角 和压力角均能降低轮系啮合应力。

关键词: 斜齿托森差速器；啮合应力；螺旋角；压力角