基于齿条近似法的谐波传动空间齿廓设计方法

摘要

针对渐开线谐波传动齿廓设计中啮合侧隙过大造成传动精度降低以及柔轮轴向偏斜产生齿廓干涉等问题,提出一种基于齿条近似法的谐波传动齿廓设计方法.该方法考虑了实际啮合情况,利用齿条近似法对柔轮齿相对于刚轮齿的实际运动轨迹进行近似齿廓设计与修形.并考虑了柔轮在装配变形下的偏斜,对柔轮齿在主截面以外的其他截面进行空间齿廓设计.结果表明:基于齿条近似法设计的谐波传动齿廓啮合侧隙很小并且啮合范围很广,按照线性关系改变柔轮齿根处壁厚可以实现柔轮齿在空载状态下任意截面的无干涉啮合.%To solve the problems of transmission precision reduction caused by large meshing backslash and tooth profile interference caused by axial coning in the design of involute tooth profile of harmonic drive, a tooth profile new design method of harmonic drive based on rack approximation method was presented.The method considers the actual meshing situation and takes advantage of rack approximation design to design and correct the approximate tooth profile based on the actual movement route of flexspline relative to circular spline.The flexspline coning caused by assembly deformation is also considered to design the spatial tooth profile of flexspline at sections other than the main section.Results show that the tooth profile of harmonic drive designed by the proposed method has very small backslash and very wide-range meshing.Non-interfering engagement at arbitrary section can be achieved under no-load condition by changing the thickness of the tooth bottom rim of flexspline based on linear relationship.