Jixie chuandong (Aug 2023)
Study of Internal Pressure Field Characteristics in Gearboxes of a Heavy-haul Locomotive Based on the Lattice Boltzmann Method
Abstract
In order to study the effect of pressure field characteristics on the lubrication and sealing of a heavy-haul locomotive gearbox, a simulation model of the gearbox internal pressure field is established by considering the sealing structure at the vent based on the computational fluid dynamics and the lattice Boltzmann method. Then the simulated results extracted at the vent are compared with the test data to verify the correctness of the simulation model. At last, the influence law of different factors on the gearbox internal pressure field is studied with this validated simulation model. The results show that the gear speed and gear steering have a great effect on the internal pressure field of the gearbox. The absolute values of the mean pressure difference or the mean values of the pressure at all the monitoring points are positively and nonlinearly correlated with the gear speed. The change of the gear steering will change the pressure difference between the upper and lower points of the gear meshing area. The pressure difference is larger when the gear rotates forward, and the gear steering also has a great impact on the pressure of other monitoring points. However, the immersion depth of the driven gear and the lubricating oil temperature (dynamic viscosity) have little effect on the gearbox internal pressure field. It can provide a theoretical basis for the operation and maintenance of the locomotive and the rational allocation of the lubricating oil.
