关键词: 极端工况；静压推力轴承；承载能力；动压补偿；模拟仿真与实验

Abstract: In order to study carrying capacity and hydrodynamic compensation of hydrostatic thrust bearing under extreme working condition， a hydrostatic thrust bearing having a new type tilting oil pad structure is put forward， and hydrostatic bearing capacity is compensated by using hydrodynamic， and high accuracy and stable operation of static pressure thrust bearing under high speed loading condition is achieved. For hydrostatic thrust bearing having aperture throttle double rectangular cavities， the reasons for the loss value and effect weight of carrying capacity by effected both oil film shear and squeeze in hydrostatic thrust bearing under high speed and heavy load working condition are analyzed by adopting hydrodynamic and hydrostatic mixing lubrication method based on the lubrication theory and tribology principle. The bottom structure of oil pad is optimized through designing connected type between pad and the base， the amount of the corresponding hydrodynamic is produced to adjust the deformation of the rotational worktable， hydrostatic carrying capacity is compensated， and a test rig is established and experiments are carried out. The calculated results qualitatively agree well with the experimental data， it has been found that when the bottom bearing length of tilting oil pad is oil pad length， and the width is 35 mm， the height is 1.5 mm， and uses clearance with 0.25mm double pins connection with the base， and the hydrodynamic effect is more obvious， and makes up for the inadequacy of hydrostatic bearing capacity， the error of experimental data and the simulation value is 5.2%， and effectively improves the running accuracy and stability of hydrostatic thrust bearing under extreme working condition.

Key words: Extreme working condition；Hydrostatic thrust bearing；Carrying capacity；Hydrodynamic compensation；Numerical and experimental study