Improvement on load performance of externally pressurized gas journal bearings by opening pressure-equalizing grooves

Design and analysis of aerostatic spindle with high load characteristics for large ultra-precision drum lathe

“…This trend is particularly evident when eccentricity ratio is more than 0.2. The similar result can be found in some literature [20]. Additionally, carrying capacity and stiffness will both increase with the increase of the gas supply pressure, but excessive gas supply pressure will cause supersonic zone.…”

“…Additionally, several previous investigations proved that porous resistance inserted in feeding system could improve the load characteristics, but gas flow characteristics of porous material had not been fully understood, and the design and fabrication of the porous material also added more complexity [17][18][19]. The research result of Du et al [20], who studied the relationship between pressure-equalizing groove and load characteristics of aerostatic journal bearings, showed that pressureequalizing groove both in circumferential and axial directions could improve the load capacity and stiffness. Long et al [21] carried out some research on the entrance effect of aerostatic thrust bearing, and the research results showed that for orifice compensated aerostatic bearing, feeding pocket can improve load capacity with the same geometric parameters.…”

CFD based investigation on influence of orifice chamber shapes for the design of aerostatic thrust bearings at ultra-high speed spindles

“…The nonlinear Reynolds equation was derived and solved to study the pressure distribution and load capacity of aerostatic bearings [5][6][7]. It was noted that the throttle orifices all acted as point sources, which could not provide detailed characteristics of the fluid flow, especially the flow field near the outlet of the orifice restrictor in aerostatic bearings.…”

Numerical Simulation and Experimental Study on the Gas-Solid Coupling of the Aerostatic Thrust Bearing with Elastic Equalizing Pressure Groove

“…Figure 2(a) is the bearing of the EEPG processing schematic. Firstly, high pressure gas is injected into the bearing to make the elastic deformation of the elastic thin plate, as shown in Figure 2(a) (1). And then grind the convex part of the elastic thin plate, as shown in Figures 2(a)(2) and 2(a) (3).…”

“…Aerostatic bearings are widely used in the field of high speed and high accuracy due to their good performance [1,2]. However, because the air has obvious compressibility, aerostatic bearing is difficult to obtain high stiffness, so that its application field is confined to the condition of light load.…”