Paper 11: Hot Oil Carry-Over in Thrust Bearings:

Six sets of experimental results concerning 14 different thrust bearing assemblies of varying type and size are analysed to find the extent of hot oil carry-over. Temperature readings from 729 pads are used in the analysis. The percentage of exit heat carried over k is shown to vary between 80 and 60 per cent, depending on sliding speed and bearing type. The temperature at entry to the pad is shown to be higher than the housing supply temperature by a simple multiple of k applied to the temperature rise along the pad. Since no formal method exists at present for the calculation of operating viscosity in thrust bearings, it is hoped that this work will form a contribution in the design procedures for thrust bearings.