By Avraham Harnoy
Overlaying the elemental rules of bearing choice, layout, and tribology, this booklet discusses uncomplicated actual ideas of bearing choice, lubrication, layout computations, complex bearings fabrics, association, housing, and seals, in addition to contemporary advancements in bearings for high-speed airplane engines. the writer explores particular recommendations to difficult layout difficulties and offers infrequent case stories, corresponding to hydrodynamic and rolling-element bearings in sequence and adjustable hydrostatic pads for giant bearings. He specializes in the layout issues and calculations particular to hydrodynamic magazine bearings, hydrostatic bearings, and rolling point bearings.
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Extra resources for Bearing Design in Machinery: Engineering Tribology and Lubrication (Dekker Mechanical Engineering)
Example text
The viscosity of synthetic oils is relatively less sensitive to temperature variations (in comparison to mineral oils). But the viscosity of synthetic oils also decreases with increasing temperature. During bearing operation, the temperature of the lubricant increases due to the friction, in turn, the oil viscosity decreases. For hydrodynamic bearings, the most important property of the lubricant is its viscosity at the operating bearing temperature. One of the problems in bearing design is the difficulty of precisely predicting the final temperature distribution and lubricant viscosity in the fluid film of the bearing.
Substituting yields Vth ¼ 2pNRav ¼ 2pN ðD1 þ DÞ ¼ 0:5pN ðD1 þ DÞ 4 Substitution in the foregoing equation yields Vth ¼ 0:5p  1000 rev=min ð0:1 þ 0:083Þ ft ¼ 287:5 ft=min This is well within the allowed limit of Vallowed ¼ 1180 ft=min. c. Calculation of Actual Average PV Value for the Thrust Bearing: PV ¼ 1736 psi  287:5 ft=min ¼ 500  103 psi-ft=min Remark. The imperial units for PV are of pressure, in psi, multiplied by velocity, in ft=min. Conclusion. Although the limits of the velocity and pressure are met, the PV value exceeds the allowed limit for self-lubricated sintered bronze bearing material, where the PV limit is 110,000 psi-ft=min.
Respectively. a. Find the axial reaction force on each of the two gears and the resultant axial force on each of the two bearings supporting the shaft. b. Find the three load components on each gear, Ft , Fr , and Fa . Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. 1 INTRODUCTION For hydrodynamic lubrication, the viscosity, m, is the most important characteristic of a fluid lubricant because it has a major role in the formation of a fluid film. However, for boundary lubrication the lubricity characteristic is important.