Machinery's Handbook, 31st Edition
2416
Journal Bearings
11) Torque parameter: From Fig. 8, T' = 1.46 12) Friction torque: . . . . T
. 6900 13 146 115 77 4800 796inch-pounds per inch f 2 # # # # = =
13) Friction horsepower:
, 63 000 1 7 96 4800 1 9 1 15 horsepower . . .
P f # # # = = 14) Factor X: From Table 5, X = 12, approximately 15) Total flow of lubricant required: . . Q 20 R # = =
12 115 069gallon per minute
16) Bearing-capacity number:
. 60 043 083 . 2 #
=
=
. 0027
C
n
17) Flow factor: From Fig. 10, q = 1.43 18) Actual hydrodynamic flow of lubricant: . . . 19) Actual pressure flow of lubricant: . . . . . Q Q
. 294 4800 19 0003 143 23 0 306gallon per minute 1 # # # # = = .
. 77 19 164 10 30 0003 23 1 1 5 0 85 0044gallon per min 2 5 3 2 # # # # # # # = + = ^ h 20) Actual total flow of lubricant: . . . Q = 0306+ 0044 0350gallon per minute = 21) Actual bearing-temperature rise: . . . t F 0350 12 115 394 # ° ∆ = = . . 22) Comparison of actual and assumed temperature rises: Because Δ t a and Δ t differ by more than 5 ° F, a new Δ t a , midway between these two, of 30 ° F is assumed and Steps 7 through 22 are repeated. 7a) Assumed operating temperature: t F 200 30 230 b ° = + = 8a) Viscosity of lubricant: From Fig. 6, Z = 6.8 centipoises 9a) Bearing-pressure parameter: . . . . P 68 4800 69 13 1372 049 2 # # # ′ = = 10a) Eccentricity ratio: From Fig. 7, . 1 1 − ε = 7.4 and ε = 0.86 11a) Torque parameter: From Fig. 8, T' = 1.53 12a) Friction torque: . . . . . T 6900 13 153 115 68 4800 736inch-pounds per inch f 2 # # # # = = 13a) Friction horsepower: , . . . P 63 000 1 7 36 4800 1 9 1 07 horsepower f # # # = =
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