关键词: 变速箱扭矩扩容；MASTA 建模分析；齿轮强力喷丸；微观参数修形

Abstract: With the research purpose of increasing and expanding the rated input torque of a 5MT gearbox from 300 Nm to 350 Nm, firstly, through bench tests and MASTA modeling analysis on the original transmission respectively, the components with insufficient strength such as gears, shafts, bearings, synchronizers, and housings and their weak points are identified. Then, the optimized designs and process schemes such as powerful shot peening and microscopic parameters for gears, thickening of the weak journal of the shaft, raw materials and heat treatment methods with better switching performance of bearings, powder metallurgy forged steel parts for synchronizer tooth hubs and adding surface treatment, and optimizing the arrangement of reinforcing ribs for the shell are proposed. Finally, bench tests and MASTA analyses are conducted on the gearboxes with enhanced measures implemented. The results show that the optimized gearbox can meet the requirements of the 350 Nm input torque working condition and achieve the purpose of torque expansion.

Key words: torque expansion of gearbox; MASTA modeling analysis; gear powerful shot peening;microscopic parameters shaping