Analysis on three-point contact ball bearing's stiffness characteristics with elastohydrodynamic lubrication effect taken into consideration
The influence of the electrohydrodynamic lubrication effect on the bearing stiffness should be considered,in order to accurately identify the three-point contact ball bearing's stiffness characteristics under the lubricated conditions.In this article,based on the proposed quasi-static model,with the high-speed centrifugal force and the gyroscopic moment taken into account,both the normal contact load between the rolling element and the inner ring or the outer ring and the speed of each component are calculated,according to the given bearing's structural parameters and working conditions.The calculation results of the quasi-static model and the lubricating medium's parameters are substituted into the electrohydrodynamic lubrication model.The pres-sure distribution and the oil-film thickness distribution between the rolling element and the inner-and-outer rings are solved.Ef-forts are made to explore the effects of the rotational speed,the axial load,and the lubricant's initial viscosity on the oil-film pressure and the minimum oil-film thickness.The effect of the rotational speed and the axial load on the bearing's contact stiff-ness and synthetical stiffness is analyzed based on the electrohydrodynamic lubrication theory.The results show that the ever-growing rotational speed will significantly increase the lubricant oil-film thickness;the lubricant's ever-growing initial viscosity will increase the oil-film thickness;the bearing's overall axial stiffness and axial oil-film stiffness will decrease with the bearing's rotational speed;the bearing's axial stiffness and axial oil-film stiffness will increase with the ever-growing axial load,and the difference won't change significantly.
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