Study on lubrication performance of hydrostatic clearance oil film considering multi-factor coupling.

The lubricating performance of the clearance oil film determines the machining accuracy of the hydrostatic thrust bearing and the stability of the oil film. From the perspective of working parameters and cavity structure, based on tribological principles and lubrication theory, the clearance oil film temperature rise equation, pressure equation, and viscosity-temperature equation are deduced, and the relationship between load-rotating speed-oil film thickness for different cavity shapes is matched. Through the combination of simulation and experiment, the multi-factor coupling influences on the lubricating performance of the clearance oil film are studied. The study found that the degree of influence on the clearance oil film temperature is in order: rotational speed, hydraulic oil viscosity, load, and cavity depth, and the degree of influence on the clearance oil film pressure is in order: load, hydraulic oil viscosity, rotational speed, and cavity depth. This work provides a theoretical basis for the research and optimization of the lubrication performance of hydrostatic thrust bearings, and provides a research direction for the machining accuracy and running stability of high-speed and heavy-duty CNC equipment. • The lubricating performance of the hydrostatic clearance oil film coupled with multiple factors is studied. • The temperature rise equation, pressure equation and viscosity-temperature relationship of different models are deduced. • The coupling relationship of load-rotating speed-oil film thickness under different cavity shapes is matched. • The pressure field and temperature field with different cavity shapes are obtained under the multi-factor coupling. • The optimal suggestions for the lubrication performance of hydrostatic thrust bearings in practical engineering are given. [ABSTRACT FROM AUTHOR]