Machinery's Handbook, 31st Edition
2426
Thrust Bearings
3) Radial pad width.
2 = 3 1 1inch − =
a
4) Pitch-line circumference.
. 2 3 1 6 28 inches π = + = ^ h 5) Number of pads. Assuming a minimum groove width of 0.062 inch, . . . i 1 0062 628 59 app = + = Take i = 6. 6) Length of pad. . . . b 6 628 0062 0985 = − = 7) Pitch-line velocity. . U 12 6 28 5,000 2,620 fpm # = = 8) Film thickness. . . h 25 2 0910 6 1 2,620 25 0 0057 inch 9 3 # # # # = = − 9) Depth of step. . . . e 0 7 0 0057 0 004 inch # = = 10) Power loss. . . . P 00057 7 3510 6 1 2,620 25 0 133 hp f 13 2 2 # # # # = = − 11) Pad step length. . . . . b 22 1 2 0 985 0 537 inch 2 # = = 12) Total hydrodynamic oil flow. . . . Q 6 6510 6 1 0 0057 2,620 0 060 gpm 4 # # # # = = − 13) Temperature rise. . . . . t F 34 0060 424 0133 28 # # ° ∆ = = B
Tapered Land Thrust Bearing Design.— The following steps define the performance of a tapered land thrust bearing, one section of which is shown in Fig. 7. Although each bear ing section is wedge shaped, as shown in Fig. 7, right, for the purposes of design calcula tion, it is considered to be a rectangle with a length b equal to the circumferential length along the pitch line of the section being considered and a width a equal to the difference in the external and internal radii. General Parameters: Usually, the taper extends to only 80 percent of the pad length with the remainder being flat, thus: b 2 = 0.8 b and b 1 = 0.2 b .
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