关键词: 圆弧齿廓, 谐波传动, 齿轮, 侧隙, 仿真, 干涉检查, 装配模型

Abstract: To ensure uniqueness, geometry invariability and continuity of tooth profile expression, a representation for circular-arc tooth profile based on arc length coordinate was proposed, and Heaviside function was used to present common tangent double circular-arc tooth profile. Assembly models of harmonic drive with circular-arc tooth profile were built under different wave generators. In these models, flexspline tooth could reflect the real working state of deformed flexspline. Using coordinate transformation, meshing simulation was executed by determining the relative position of engaged teeth profile. Then, gear backlash distribution of engaged teeth profile during assembly was obtained. And interference check was carried out according to the backlash. Experimental results showed that harmonic drive with double circular-arc tooth profile had wider meshing range and uniform backlash distribution. The change of maximum radial displacement of flexspline would lead to larger influence on backlash distribution, even cause teeth rofile interference.

Key words: circular-arc tooth profile, harmonic drive, gear, backlash, simulation, interference check, assemble model