To explore the distribution and parameter optimization method for the oil-air two-phase flow field of the intermediate gearbox under splash lubrication, a numerical model of the intermediate gearbox under splash lubrication was established based on Computational Fluid Dynamics (CFD) firstly. The Volume of Fluid (VOF) multiphase flow model and dynamic mesh model were used to calculate the oil distribution in the gearbox and the oil flow rate of the oil guide tube. The influences of the oil immersion depth and rotational speed on the lubrication effect of the gear face and bearing (reflected by the oil flow rate of the oil guide tube) were analyzed. Furthermore, an experiment was conducted on the intermediate gearbox transmission test-rig to verify the feasibility of the simulation. Results show that it is recommended that the oil immersion depth and rotational speed are in the ranges of 17-26 mm and 4 000-6 000 r/min, respectively. The flow trend of the oil in the four oil guide tubes was consistent with the CFD simulation results, while no oil was collected in one oil guide tube, showing the unreasonableness of the structure of this oil guide tube.
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