Machinery's Handbook, 31st Edition
Journal Bearings
2411
3.2
2.8
1.0 1/d = 2.0
2.4
0.8
0.6
2.0
0.5
0.4
1.6
0.3
0.2
1.2
0.1
0.8
0.4 0
8 1216202428323640 l/(1 – ε )
0
4
Fig. 7. Bearing Parameter P ′ , versus Eccentricity Ratio 1/(1 − ε ) — Journal Bearings. 11) Torque parameter T ′ : This value is obtained from Fig. 8 or Fig. 9 using 1/(1 − ε ) and l / d . 12) Friction torque T: This value is calculated from the formula: T m T r ZN 6900 1000 2 ′ = ^ h where r = journal radius, inches 13) Friction horsepower P f : This value is calculated from the formula: , P KTNl 63 000 f = where K = 1 for single oil hole, 2 for central groove. 14) Factor X: This factor is used in the calculation of the lubricant flow and can either be obtained from Table 5 or calculated from the formula: . X c 01837 α = where α = oil density in pounds per cubic inch c = specific heat of lubricant in Btu/lb/ ° F 15) Total flow of lubricant required Q R : This is calculated from the formula: Q t X P R a f ∆ = ^ h
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