Machinery's Handbook, 31st Edition
Journal Bearings
2413
Table 5. X Factor versus Temperature of Mineral Oils Temperature X Factor 100 12.9 150 12.4 200 12.1 250 11.8 300 11.5 16) Bearing capacity number C n : This value is needed to obtain the flow factor and is calculated from the formula: C d l P 60 n 2 ′ = a k ⁄ 17) Flow factor q: This value is obtained from the curve in Fig. 10.
2.0
1.5
1.0
0.5 0 0 0.02 0.04 0.06 0.08 0.10
0.12 0.14 0.16 0.18 0.20 0.22
Bearing Capacity Number, Cn
Fig. 10. Flow Factor, q , versus Bearing Capacity Number, C n —Journal Bearings. 18) Hydrodynamic flow of lubricant Q 1 : This flow in gallons per minute is calculated from the formula: Q Nlc qd 294 d 1 = 19) Pressure flow of lubricant Q 2 : This flow in gallons per minute is calculated from the formula: Q Kp s c d 3 d (1 + 1.5 ε 2 ) Zl 2 = where K = 1.64 × 10 5 for single oil hole K = 2.35 × 10 5 for central groove p s = oil supply pressure
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