Testing safety factor of flexible gear rim in harmonic gear drive by the finite element method
Keywords:
Harmonic drive, Flex-spline, FEM, External force, Transposition, Safety factorAbstract
In wave transmission, the flexible gear (flex-spline) is a complex stage that has a decisive effect on the working capacity and durability of the transmission. In the absence of finite element software, the Russians came up with formulas to determine the factor of safety for flexible gears. The question is how this coefficient will change when using finite element software. This paper has the purpose of determining the external force acting on the flexible gear rim by performing an estimate to calculate the external force, then using this mechanical and external force to specify the safety factor of the flexible gear on the finite element software. The insignificant differences between the traditional calculation and the modern calculation suggest the reliability of both. Nowadays, with the wide applications of industrial robots, the harmonic drive is very common, in which the problem mentioned here is one of the key points of design.
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