Abstract
The present paper is about transmission gearbox's design, the vehicles speed change technology is the improvement, enhances the vehicles overall performance the key technologies, is in the world automobile industry more than 100 year development processes the most representative technology, simultaneously is also other technologies in vehicles technology manifestation. Along with science's and technology's rapid development, the vehicles speed change technology has also had the change which changes with each new day, the massive new technologies, the new achievement integrate unceasingly. This article in thorough inspection speed change technology application prospect foundation, according to similar vehicle type in typical road section actual random loading, with the statistical analytic method composition loading spectrum, carries on transmission gearbox's fatigue life computation. This reliability design method comparison tallies with the reality, if again the optimization design method choice related design variable and makes the optimum matching with the engine conditions, then may obtain by the smallest spare part size satisfies the life which and the performance design proposal the design requests. Sometimes may also auxiliary by the finite element analysis.