Angular-Compliant Hydrodynamic Bearing Performance Under Dynamic Loads

Abstract

The study is focused on a dynamically loaded composite bearing, consisting of a hydrodynamic journal bearing inside the internal race of a rolling-element bearing. In this combination, the hydrodynamic bearing has an angular-compliant sleeve with a restricted freedom of rotation around its axis. Under static loads, the improvement is primarily in a significant reduction of friction and wear during the starting and stopping. Under periodical loads, our analysis shows that the performance depends on two dimensionless design parameters. Below particular critical values of these parameters, the results show a considerable improvement, demonstrated by a reduction of the maximum eccentricity. However, above the critical values, the bearing becomes unstable. These results indicate the significance of incorporating this computer assisted computation for each design.

Hydro-Roll: A Novel Bearing Design with Superior Thermal Characteristics

“…Calculations show that the temperature profile in the hydro-roll sleeve tends to be more uniform than conventional bearings so that hot spots are less likely to occur. Furthermore, Harnoy and Rachoor (19) recently showed that this bearing design offers significant advantages when operating under dynamic loads. T h e journal center trajectory has a lower maximum eccentricity compared to that of a conventional journal bearing with a stationary sleeve under equivalent dynamic loads.…”

The maximum dynamic eccentricity ratio of hydrodynamic rolling hybrid bearings

“…In order to restrict the rotation of the rolling bearing at high speeds, centrifugal devices such as friction clutch, [14][15][16] spring, 17,18 and frangible link 19 were added in those series configurations. However, the centrifugal lock devices may disturb the operation of the fluid bearing and the rotor especially at high speeds.…”