Precision Harmonic Drive Bearer Failure Within The The Nie Output Ring Overloaded

The servo drive system in aerospace engineering must meet the requirements of small volume and light weight and very large load capacity, so general commercial products can hardly reach these standards; the conventional design of harmonic drive is based on mechanical model hypothesis and experimental formulas and there is little theory and trial for high-load precious harmonic drive mechanism. Considering the specialty of aerospace condition, this paper aimed at internal-engaged output and high-load capacity harmonic drive, theoretically studied the mechanics potential, load capacity and failure, trying to provide some necessary theoretical rudiments for the new products that aerospace need.Based on the precious capacity analysis of harmonic drive in aerospace this paper firstly obtained that the weak point in flexspline directly effect the load capacity. The flexspline's stress and deformation results of general theory and Abaqus simulation of the assembly compared differently and the finite element method could more truly show the real rule of stress and deformation. The effect rule of stress and deformation was obtained by changing the length-diameter ratio, thickness, input tooth width, output tooth width, etc.According to the specialty of aerospace condition, the variation rule of stress and deformation of the flexspline is obtained by simulation of the assembly under 1 to 5 times load rating and getting across area stress and deformation and finding the dangerous across area and its stress. The load capacity rule of the ring harmonic drive under 1,3 and 5 times load rating affected by the structural parameters was obtained after studying the factors of the length-diameter ratio, thickness, input tooth width, output tooth width, etc.The main failure form of the flexspline was obtained through the special analysis of the harmonic drive and the theoretical calculation formula for tooth abrasion of the internal-engaged Ring-flexspline was rationed according to its deformation trend as well as the main reason is nose interference of the flexspline under different high-overload.