Optimization Study of Dynamic Stiffness of Double-Row Angular Contact Ball Hub Bearings
Aiming at the current situation that the stiffness performance of wheel bearing units will directly affect the service performance of automobiles,the stiffness characteristics of wheel bearings are investiga-ted,and a method based on the analysis of dynamic stiffness characteristics of non-standard wheel bearings by Romax and an design method based on particle swarm algorithm(PSO)are proposed.By using Romax software to simulate the non-standard wheel bearings,the influence of preload,contact angle and two-row spherical centre distance on the dynamic stiffness matrix of a certain type of wheel bearings is investigated and verified by theory and test.The results show that:with the increase of preload,the dynamic stiffness of the bearing shows an overall increasing trend;with the increase of contact angle,the radial stiffness decrea-ses,and the axial stiffness and angular stiffness increase;with the increase of the two rows of ball distance,the radial stiffness and axial stiffness decrease slightly,and the angular stiffness increases.Taking the maxi-mum angular stiffness of the wheel bearing unit as the optimization objective,the internal structural parame-ters of the bearing are optimized and designed,and the angular stiffness increases by 14.4%after the opti-mization,which achieves the optimization objective of increasing the angular stiffness,and provides meth-odological support for the design and optimization of the wheel bearing structure.
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