Machinery's Handbook, 31st Edition
2432
Thrust Bearings
h min
a
b
U
1.45 h min 0.58 b
D 1 + D 2 2
b
D 1
D 2
Fig. 12. Basic Elements of Tilting Pad Thrust Bearing.* 1) Inside diameter, D 1 . Determined by shaft size and clearance. 2) Outside diameter, D 2 . Calculated from the formula D K p W D 4 g 2 1 2 π = + c m 1 ⁄ 2
where W = applied load, pounds K g = 0.8 p = unit load from Table 1 3) Radial pad width, a. Equal to one-half the difference between the inside and outside diameters: a D D 2 2 1 = − 4) Pitch-line circumference, B. Found from the mean diameter: B D D 2 1 2 π = + a k 5) Number of pads, i. The number of pads may be estimated from the formula i a BK g = Select the nearest even number. 6) Length of pad, b. Found from the formula b i BK g , 7) Pitch-line velocity, U . Calculated in feet per minute from the formula U BN = 12 8) Bearing unit load, p. Calculated from the formula p iab W = 9) Operating number, O. Calculated from the formula . O pb Z U 5 14510 7 2 = − where Z 2 = viscosity of oil at outlet temperature (inlet temperature plus assumed tem perature rise through the bearing). * See footnote on page 2418.
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