Bearing Design in Machinery: Engineering Tribology and by Avraham Harnoy

By Avraham Harnoy

Overlaying the elemental rules of bearing choice, layout, and tribology, this e-book discusses uncomplicated actual rules of bearing choice, lubrication, layout computations, complex bearings fabrics, association, housing, and seals, in addition to fresh advancements in bearings for high-speed airplane engines. the writer explores specific suggestions to not easy layout difficulties and provides infrequent case experiences, equivalent to hydrodynamic and rolling-element bearings in sequence and adjustable hydrostatic pads for big bearings. He specializes in the layout issues and calculations particular to hydrodynamic magazine bearings, hydrostatic bearings, and rolling point bearings.

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Additional info for Bearing Design in Machinery: Engineering Tribology and Lubrication (Dekker Mechanical Engineering)

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It is interesting to note that although most rolling bearings are selected by considering their fatigue life, only 5% to 10% of the bearings actually fail by fatigue. At high-speed operation, a frequent cause for rolling bearing failure is overheating. The heat generated by friction losses is dissipated in the bearing, resulting in uneven temperature distribution in the bearing. 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.

The radial force on the gear (Fr in Fig 1-1) is: Fr ¼ Ft tan f Fr ¼ 418 N Â tan 20 Fr ¼ 152 N b. Calculation of the Thrust Load, Fa : The axial force on the gear is calculated by the equation, Fa ¼ Ft tan c ¼ 418 N Â tan 30 ¼ 241 N Ft ¼ 418 N Fr ¼ 152 N Fa ¼ 241 N Large gear The same procedure is used for the large gear, and the results are: Ft ¼ 140 N Fr ¼ 51 N Fa ¼ 81 N Thrust Force on a Bearing One bearing supports the total thrust force on the shaft. The resultant thrust load on one bearing is the difference of the two axial loads on the two gears, because the thrust reaction forces in the two gears are in opposite directions (see Fig.

Bearings from the aforementioned list can be selected, namely, rolling-element bearings or fluid film bearings. In most applications, the sliding surfaces of the bearing are lubricated. However, bearings with dry surfaces are used in unique situations where lubrication is not desirable. Examples are in the food and pharmaceutical industries, where the risk of contamination by the lubricant forbids its application. The sliding speed, V , and the average pressure in the bearing, P, limit the use of dry or boundary lubrication.

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