POWER LOSS

The power loss in the bearing due to viscous friction

where P in hp, F _? in lbf, and U in ft/min

where P in kW, F _? in kgf, U = ?dn' = velocity in m/s, d in m, and n in rps

where P in kW, F _? in N, and U in m/s

Table 24-15d: Values of factor k _g for grease lubrication at various rotational speeds
Journal speed, n in rpm	k _g
up to	100	0.1
	250	0.2
	500	0.4
	1000	1.0
Courtesy: Neale, M. J., Tribology Handbook, Newnes Butterworth

Figure 23-19: Journal inside the bearing under Load ( W) at speed ( n ?).

Figure 23-20: Variation of coefficient of friction variable ?/ ? with S for 60 partial journal bearing.

Figure 23-21: Variation of coefficient of friction variable ?/ ? with S for 120 partial journal bearing.

Figure 23-22: Variation of coefficient of friction variable ?/ ? with S for 180 partial journal bearing.

Figure 23-23: Variation of coefficient of friction variable ?/ ? with S for 360 partial journal bearing.

Figure 23-24: Variation of the coefficient of friction variable ? _? = ?/ ? with S for 360 journal bearing. [Boyd and Raimondi ⁵]

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Machine Design Databook, Second Edition