Research on the dynamic pressure effect of clearance oil film of stepped hydrostatic thrust bearing

Abstract

The dynamic pressure effect of the clearance oil film of stepped hydrostatic thrust bearing is studied by taking the double rectangular cavity oil cushion as an example. According to the hydrodynamics theory, the average dynamic pressure of lubricating oil film in different clearance height regions is theoretically deduced and calculated, and the dynamic pressure effect of the clearance oil film in the stepped hydrostatic thrust bearing is studied through the combination of theoretical calculation, simulation, and experimental verification. It is found that the theoretical value of the average dynamic pressure of the clearance oil film and the rotational speed show a linear growth relationship with a slope of 275.2. The simulated value of the average dynamic pressure and the rotational speed follow the growth law of the Fourier 1 model. The experimental value of the average dynamic pressure is between the theoretical value and the simulated value, which is basically not affected by the load. In the speed range of 0r/min-200r/min, compared with the viscosity of lubricating oil, the speed is the main factor affecting the dynamic pressure of the oil film of the stepped hydrostatic thrust bearing. The dynamic pressure value of the clearance oil film increases in a stepped fashion along the radial direction of the double rectangular cavity oil cushion. The dynamic pressure value has an obvious upward trend at the junction of the circumferential right oil cavity and the sealing edge and then decreases to 0 after reaching the peak value.