Abstract
The insertion of a free-floating coaxial element between the shaft and the hydrostatic journal bearing allows the total relative speed at the facing surfaces to be split into two lower separate contributions. The rotating speed of the sleeve is self-controlled by the viscosity of the lifting fluid and its value can be imposed during the design process by an accurate calibration of the heights of the clearances. Both rigid and deformable theoretical models have been developed. Their numerical predictions are compared to results obtained from experimental tests on the prototype of an hydrostatic spindle provided with floating journal bearings.
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