Numerical Simulation of Aerospace Microminiaturization Decelerator Transmission Scheme Selection and Structural Design

Several kinds of reducing gears probably with small space and great transmission ratio are analyzed and compared. Transmission with small teeth difference which is equipped with the first level bevel gear pair and the second level beveloid gear is adopted as the transmission mode of the microminiaturization reducing gear. Besides, the vertical shaft transmission power is also adopted. Meanwhile, second level transmission with small teeth difference is introduced for beveloid gear considering reducing the vibration and return difference. The characteristics of the beveloid gear are also analyzed in this thesis. In the meantime, the thesis provides selection for main parts materials, efficiency calculation, bearing selection, and shaft design as well as assembly diagram. This paper constructs mathematical models for the backlash of bevel gear pair, beveloid gear pair and drive system according to the structural features of reducer. Through the analyses on the influencing factors of bevel gear backlash and the influence of adjusted clearance quantum of beveloid gear on the whole machine backlash of reducer, the influencing parameters of backlash are found out, the calculation on backlash is adjusted, and finally a quantitative calculation is conducted. The design results ensure that the backlash of reducer can achieve the predetermined design requirements, and also ensure the operating requirements from large gear ratio, high torque and large bending moment of the whole reducer system.