Numerical analysis of film thickness loss and film temperature of variable viscosity hydrostatic bearing

In this study, Q1-224 double rectangular cavity hydrostatic plain bearing was selected as the research object, theoretical analysis, variable viscosity simulation and experimental verification is adopted as study method. The 6DOF Dynamic Mesh and compile UDF program for boundary motion and variable viscosity conditions were used to simulate oil film temperature of hydrostatic bearing with variable film thickness under different working conditions. The simulation results showed that under the same initial film thickness, the pressure loss caused by the increase of rotation speed would make the film thickness thinner and caused the “oil loss phenomenon.” The rotational speed range increases from 40 r/min to 120 r/min, and the oil film thickness loss rate increases from 5% to 17%. With the increase of rotation speed, the oil film temperature gradually increased, the oil film thickness loss was greater and the oil film temperature rise was more serious, the oil film temperature rise was greatly affected by the oil film thickness loss. Finally, the correctness of the theoretical findings was proved by designing experiments. The research conclusion of this paper provided a theoretical reference for lubrication design of variable viscosity hydrostatic bearings.