Temperature Field And Pressure Field Digital Simulation Of Transmission Gear For Locomotives

The temperature of locomotive transmission gearbox will be increase when it is working, because of the power losing by gears transmission and churning oil, friction heat caused by bearing transmission surface. The oil in cabinet lubricates and cools down the gear and the various components in the form of high-speed splashing. At the same time, disclosure phenomenon and other sealing problems will be occurred at the sealing parts and loophole of gearbox caused by the oil impacts the gearbox.Study the distribution of temperature and pressure field for high-speed locomotive transmission gearbox thought the dynamic simulation, which can analysis the fluid flow within the gearbox, and search the discipline of fluid motion by visualization window. This is very important in improving sealing performance and providing realistic significance for the gearbox thermal design.In this paper, the heat transfer model of the transmission gearbox for the locomotives is established. Through analyzing the heating mechanism, heat power losing and heat transfer coefficient in different condition, establishing the heat balance energy equation, and the temperature field for the transmission gearbox is saluted.The results show that the maximum value of temperature in gearbox intracavity appeared at two gears engaged, where is the center, temperature field decreasing to outward at a certain gradient; The thermal equilibrium temperature of gearbox increases linearly with the rotation speed and circumstance temperature, but, it no longer follows linear law increasing with the depth of immersion oil.The minimum value of temperature in gearbox intracavity appeared in the regions of the depth of immersion oil between 0.75 and 1.0multiple tooth; In the regions of the depth between 1.0 and 1.75multiple tooth, the thermal equilibrium temperature of gearbox increases with the depth of immersion oil, but between 0.25 and 1.75 multiple tooth, the thermal equilibrium temperature of gearbox decreases with the depth of immersion oil.Dynamic simulation for flow field of gearbox, which can reproduce flowing and eroding tank Details of oil when the gear whirls in high speed. The work of simulating was done on Fluent, which establishes Two-phase turbulence model for gearbox using the dynamic mesh.The value of pressure in gearbox intracavity starts dropping with the gearbox running, the value near the loophole decreases from a standard atmospheric pressure to the regions fluctuations in between 0.0825MPa and 0.087MPa; as the gearbox operating stably, the value of pressure in gearbox intracavity increases with the motor rotation speed.It is very important to study the Distribution of temperature and pressure field, the laws of the actual working conditions about the gearbox for effectively prevent overheating and leaking of gearbox, and also, it can provide important reference data and theoretical support for structural optimization in gearbox design.