An Analysis of the Parallel-Surface Thrust Bearing

Abstract The well-known Reynolds differential equation for the pressure obtaining in a hydrodynamic bearing, operating under steady conditions of load and speed, is rederived for a fluid of variable density. When this equation is applied to the parallel-surface thrust bearing, a definite load capacity is found to exist. This result is not obtained from the original Reynolds equation but is in agreement with the observed performance of parallel-surface thrust bearings operating at moderate speeds. However, even this extension of the theory does not explain the performance characteristics of the parallel-surface bearing at very high rotative speeds. The parallel-surface thrust bearing is analyzed with respect to pressure distribution, load capacity, and friction characteristics, these results being compared on a nondimensional basis with those for a comparable tilting-pad bearing.