摘要
In order to eliminate the meshing interference between the flexspline and circular spline after the taper deformation of the flexspline,the radial deformation difference method,major and minor axis fitting method,and ellipse fitting method are used to modify the tooth thickness of the flexspline and analyze the performance indexes such as the assembly stress,transmission error,and fatigue life.Firstly,the conjugate tooth profile is solved based on the quadruple-circular-arc tooth profile and modified kinematic method.Then,based on the finite element radial deformation of the flexspline,the principle and characteristics of three modification methods are analyzed,and the modification amount of each section of the flexspline tooth is calculated.Finally,the influence of the three modification methods on the performance of the harmonic drive is compared.The results show that the radial deformation difference method can initially determine the modification amount.The minimum static assembly stress is 406.22 MPa by the major and minor axis fitting method.The ellipse fitting method has the best dynamic performance,small transmission error fluctuation,a peak-to-peak value of 3.060",and a maximum fatigue life of 10^(7.558)cycles.
为消除柔轮锥度变形后与刚轮的干涉啮合,使用径向变形量差值法、长短轴拟合法与椭圆拟合法对柔轮齿厚修形,并分析装配应力、传动误差和疲劳寿命等性能指标。首先,基于四圆弧齿形与改进运动学法进行共轭齿廓求解;其次,在柔轮有限元径向变形量的基础上,分析三种修形方法的原理和特点,并计算柔轮齿各截面的修形量;最后,对比三种修形方法对谐波减速器性能的影响。结果表明,径向变形量差值法可初步确定修形量;在静态下,通过长短轴拟合法获得的装配应力最小,为406.22 MPa;在动态下,通过椭圆拟合法获得的效果最优,传动误差波动小,峰峰值为3.060",柔轮疲劳寿命可循环次数最高,为10^(7.558)次。
