Development of measures for resisting forces reduction while roller bearings operation
Aeronautical and Space-Rocket Engineering
Аuthors*, , **
Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia
The presented article deals with the matters related to operation of the roller bearings, functioning as part of rotors of the single-shaft and multi-shaft aircraft gas turbine engines, as well as methods of their hydraulic resistance reduction by the mating surfaces profiling. It presents examples of the developed roller bearing structures and results of their examining.
The goal, consisted in developing measures for the energy losses reduction while the bearing operation, has been achieved. For this purpose, the authors are solving the problem of the hydraulic resistance and internal friction reducing in the oil layers. To develop a physical model of the oil wedge hydrodynamic process they used the results of thermal imaging and temperature measuring on the operating bearing instrumented with the fiber-optic sensor, which is a new approach to this matter.
The developed roller bearings structure with the oil-removing grooves (which realizes oil bypass from the oil wedge zone with high pressure to the zone with reduced pressure) enables losses reduction on the internal friction in the oil layers, and avoid cavitation in the zone of oil wedge rarefaction. Analysis of the experimental determination results of the bearing temperature variation, that demonstrated its notable reduction, serves as a confirmation of this conclusion.
The obtained results attest to the possibility of employing the roller bearings with grooves, made on the mating surfaces of rolling elements and bearing tracks, to increase their operation efficiency by reducing the energy losses, as well as decreasing the heat liberation and functional noise.
Such bearings are expected to be employed in the structure of rotor supports in the aircraft and ground-based gas turbine engines. The proposed design may be expanded as well to the high-load bearings of different engineering products, especially operated under conditions of higher requirements to the absence of vibration and noise.
Keywords:roller bearing, lubrication system, oil wedge, bearing losses
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