Machinery's Handbook, 31st Edition
2418
Thrust Bearings
Step
Flat Plate
Tapered Land
Tilting Pad
Fig. 1. Types of Thrust Bearings. Table 1. Thrust Bearing Loads*
Normal Unit Loads, lb/in 2
Maximum Unit Loads, lb/in 2
Type
Parallel surface
<75 200 200 200
<150 500 500
Step
Tapered land Tilting pad
500 Thrust Bearing Design Notation.— The symbols used in the design procedures that fol low for flat plate, step, tapered land, and tilting pad thrust bearings are as follows: a = radial width of pad, inches b = circumferential length of pad at pitch line, inches b 2 = pad step length B = circumference of pitch circle, inches c = specific heat of oil, Btu/gal/ ° F
D = diameter, inches e = depth of step, inch f = coefficient of friction g = depth of 45 ° chamfer, inches h = film thickness, inch i = number of pads
J = power loss coefficient K = film thickness factor K g = fraction of circumference occupied by the pads; usually 0.8 l = length of chamfer, inches M = horsepower per square inch N = revolutions per minute O = operating number p = bearing unit load, psi p s = oil-supply pressure, psi P f = friction horsepower Q = total flow, gpm * Reproduced with permission from Wilcock and Booser, Bearing Design and Applications, McGraw- Hill Book Co., Copyright © 1957.
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