Bearing Design in Machinery: Engineering Tribology and by Roger Beck
By Roger Beck
Emphasizes simple actual thoughts in bearing adoption, association, housing, lubrication, and sealants; exchange bearing varieties for particular initiatives; and specified strategies to bearing layout difficulties. Textbook.
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Extra info for Bearing Design in Machinery: Engineering Tribology and Lubrication
During operation, the temperature of the rolling bearing outer ring is lower than that of the inner ring. In turn, there is uneven thermal expansion of the inner and outer rings, resulting in Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. thermal stresses in the form of a tight fit and higher contact stresses between the rolling elements and the races. The extra contact stresses further increase the level of friction and the temperature. This sequence of events can lead to an unstable closed-loop process, which can result in bearing failure by seizure.
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. b. Radial Bearing Calculation of Average Pressure P¼ Fr A Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. where A ¼ LD is the projected area of the bearing. Substitution yields P¼ Fr 1200 lbf ¼ 1200 psi ¼ LD 1 in: Â 1 in: Calculation of Journal Surface Velocity. The velocity is calculated as previously; however, this time the velocity required is the velocity at the surface of the 1-inch shaft, D=2.
Also, the chart is convenient for conversion between the unit systems. 5 VISCOSITY^TEMPERATURE CURVES A common means to determine the viscosity at various temperatures is the ASTM viscosity–temperature chart (ASTM D341). An example of such a chart is given Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. F IG. 2-2 Viscosity conversion chart from Saybolt universal seconds. in Fig. 2-3. The viscosity of various types of mineral oils is plotted as a function of temperature. These curves are used in the design of hydrodynamic journal bearings.