Foil bearings are self-acting hydrodynamic bearings that use ambient air as the lubricant. They operate at high speeds (no diameter x speed (DN) limit) with a broad temperature range and tolerate misalignment and distortion.Analytical methods provide the opportunity to evaluate, refine, and optimize new designs in advance of hardware fabrication.
A journal foil bearing will support about one pound
per square inch of projected area, LxD
200 to 1200 °F. per inch of bearing diameter, D
per thousand rpm, N
Load = Dj(LxD)xDxN
Above: Large Diameter foil bearings and journal bearing shafts