Static characteristics of hydrostatic thrust bearing considering the inertia effect on the region of supply hole

Abstract

In the previous studies on the hydrostatic thrust bearing, the differences between the theoretical results and experimental results are obvious when the inertia parameter S and the ratio of supply hole radius to bearing radius r0/ R become large enough. To explain the differences, in this study, the inertia effect on the region of supply hole is considered in discussing the static characteristics of hydrostatic thrust bearing, and then new expressions of pressure, load capacity, and flow rate are given. For the continuous parallel bearing, the results of this study agree well with experiments, thus there is no need for the extra modified inertia theory. For the step bearing with a large inertia parameter (e.g., S = 2), the results of this study agree with experiments on the recess region, and are closer to the experimental results than those of old method on the region of bearing land. So when the inertia parameter S and the ratio of supply hole radius to bearing radius r0/ R are large enough, the inertia effect on the region of supply hole cannot be ignored in discussing the static characteristics of hydrostatic thrust bearing.

Influence of shape errors and inertia effects on the error motion of the aerostatic spindle

“…25,26 By comparing the theoretical and experimental results of the static performance of a hydrostatic thrust bearing, Tian et al noted that when the ratio of the radii of the supply hole and bearing and the inertia parameter are sufficiently large, the inertia effect on the region of the supply hole cannot be ignored. 27 Ma et al calculated the effects of fluid inertia and cavitation on the performance of spiral-grooved mechanical face seals, and the results showed that the inertia effect owing to film thickness discontinuities improved the load capacity and increased the leakage rate. 28 Chen et al studied the combined effects of manufacturing errors, misalignment, and inertia effects on bearing performance.…”

Investigation of the Static Performance of Hydrostatic Thrust Bearings Considering Non-Gaussian Surface Topography

“…Hydrostatic bearings have a number of advantages, such as high loading capacity, stiffness, and low frictional wear, which makes them ideal for heavy and precision mechanical equipment [1]. Thus, hydrostatic bearings are used widely in the spindles of machine tools such as high-precision lathes and grinding machines; optimizing the design of hydrostatic bearings is an important way to improve the performance of machine tools [2,3].…”

Mathematical Analysis of Effects of Surface Roughness on Steady Performance of Hydrostatic Thrust Bearings Lubricated with Rabinowitsch Type Fluids

“…Several investigations have been carried out to analyse the dependence of different performance properties of these bearings on rotational inertia, fluid compressibility and temperature variation of the fluid (Coombs and Dowso 1964;Peterson et al 1994;Kapur and Verma 1979). Optimization of design of hydrostatic thrust bearings with special consideration on shape and radii of recess and supply hole, and different operating conditions have been done time-to-time (Singh et al 1983;Sharma et al 2002;Tian et al 2018;Younes 1993;Bakker and van Ostayen 2010;Sawano et al 2015). Yadav and Kapur (1981) considered the simultaneous effects of temperature and rotational inertia of fluid on the overall performance of hydrostatic step thrust bearings.…”