Loads

Minimum load For additional information (→ Requisite minimum load)	Perform calculations The weight of the components supported by the bearing, together with external forces, generally exceed the requisite minimum load. If this is not the case, the bearing must be subjected to an additional axial load. However, the requisite minimum load can be neglected for bearings operating at relatively slow speeds, depending on the outside diameter (diagram 1). Example: A 29444 E bearing is to operate at 90 r/min, from diagram 1 with D = 420 mm the two lines converge below the blue line. Therefore, the minimum load requirement can be ignored.
Equivalent dynamic bearing load For additional information (→ Equivalent dynamic bearing load)	F_r ≤ 0,55 F_a and: if run-out in the bearing arrangement does not affect the load distribution in the spherical roller thrust bearing → P = 0,88 (F_a + X F_r) if run-out in the bearing arrangement affects the load distribution in the spherical roller thrust bearing (e.g. the run-out of another bearing that induces radial forces) → P = F_a + X F_r F_r > 0,55 F_a → Contact the SKF application engineering service. Perform calculations
Equivalent static bearing load For additional information (→ Equivalent static bearing load)	F_r ≤ 0,55 F_a → P₀ = F_a + X₀ F_r F_r > 0,55 F_a → Contact the SKF application engineering service. Perform calculations

Symbols

A	minimum load factor (→ product table)
C_r	load factor = 1,8 for 292 series = 2,0 for 293 series = 2,2 for 294 series
D	bearing outside diameter [mm]
d	bearing bore diameter [mm]
f₀	factor for lubrication method. For oil bath lubrication with a horizontal shaft and for grease lubrication: = 3 for 292 series = 3,5 for 293 series = 4 for 294 series For oil bath lubrication with a vertical shaft and for oil jet lubrication: = 6 for 292 series = 7 for 293 series = 8 for 294 series
F_am	minimum axial load [kN]
F_lub	axial load required to overcome lubricant drag [kN]
F_r	radial load [kN]
n	rotational speed [r/min]
P	equivalent dynamic bearing load [kN]
P₀	equivalent static bearing load [kN]
X	calculation factor = 1,1 for 292 series = 1,2 for 293 series = 1,3 for 294 series
X₀	calculation factor = 2,5 for 292 series = 2,7 for 293 series = 2,9 for 294 series
ν	actual operating viscosity of the lubricant [mm²/s]