Loads

Minimum load

For additional information → Requisite minimum load

The minimum load requirements can be ignored for bearings operating at the relatively low speeds shown within the green area in diagram 1.

For operating speeds outside the green area use:

Catalogue image - Fam - minimum load

Catalogue image - Flub for v n gt or eq 2000

Catalogue image - Flub for v n lt 2000

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 → Use an additional bearing, which accommodates the radial load.

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 → Use an additional bearing, which accommodates the radial load.

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]