Numerical Simulation Of Gearbox Seal System

The high-speed train has played an irreplaceable role with the continuous development of China’s urbanization process. With the continuous improvement of the speed, it also brings a lot of problems at the same time. Due to too many tunnels and harsh environment for the high-speed trains running in the Wuhan-Guangzhou line, the gearbox imported from Germany appeared the phenomenon of oil channeling and leakage. This not only causes a waste of resources, but also threats to the safe running of high-speed trains. So, the study of the gearbox sealing system has a very important significance in order to make it adapt to the working environment of our country and provide reliable basis to promote the localization of gearbox sealing system key technology.In this paper, the calculation models of the sealing system on the input and output side were built, using the gearbox sealing system of a model high-speed train as the research object. And then the numerical analysis was made about the internal velocity field and pressure field on the input and output side respectively. The studies show that:reducing the temperature of the gearbox, the leakage will be reduced by more than60%, reducing the sealing gap, the leakage will be reduced by more than90%,when the train is running at the speed of100Km/h. Reducing the sealing gap, the leakage will be reduced by more than80%when the train was running at the speed of250Km/h. Therefore, the most effective way to reduce the leakage is to reduce the sealing gap. And we also make a simple assessment about the original sealing system in this paper.At last in this paper, the through-type axial labyrinth sealing system was optimized. The affect on leakage caused by the changing of cavity length (L), the tooth height (H) and the tooth width (B) was studied on the basis of the original model. And the studies show that:the leakage will be reduced to the minimum when choosing the optimum values of the cavity length, the tooth height and the tooth width. Summing up all the factors, we make an optimization design of the sealing system and conclude that, the leakage will be reduced by10.4%after optimization.