Here, aiming at a thrust sliding bearing of a rolling bearing testing machine subjected to transient impact load, the dynamic model for the thrust bearing-rotor system and the simplified bearing pedestal structural deformation model were established. Reynolds equation for thrust bearing oil film was solved with the finite element method, the axial dynamic equation of the rotating shaft was solved using Euler integral method, and the structural deformation of bearing pedestal was solved with ANSYS simulation. Through the combined solving, variations of the thrust bearing’s oil film resultant force, minimum oil film thickness and flow rate with time varying in impact process were obtained. Impact responses of the thrust bearing considering and not considering structural deformation of bearing pedestal were compared. The results showed that effects of bearing pedestal elastic deformation on oil film resultant force and minimum oil film thickness can’t be ignored; without considering structural deformation, response speeds of oil film resultant force and minimum oil film thickness are much faster, and their response time decreases by about 22%; elastic deformation delays response process, it acts as a buffer and shortens the time required to reach the system’s steady state; when elastic deformation is considered or not, the maximum value of oil film resultant force and the minimum value of the minimum oil film thickness are basically the same; appropriate structural stiffness of bearing pedestal can improve the anti-impact ability of thrust bearing; the structural stiffness should not be less than a certain critical value, too small structural stiffness may cause the minimum oil film thickness of a certain tile to be very small and hard to bear large transient impact load; too large structural stiffness may cause bearing pedestal structure to be complex without buffering effect, and some connectors to fail too early.
Key words
thrust bearing /
impact resistance /
structural elastic deformation /
response analysis
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