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, for example, by using springs.

Equivalent dynamic bearing load

For additional
information
(→ Equivalent dynamic bearing load)

Locating bearings to accommodate radial and axial load:


Fa/Fr ≤ e → P = Fr + Y1 Fa

Fa/Fr > e → P = X Fr + Y2 Fa 


For a proper function, SKF recommends:

  • Fa ≥ 1,27 Fr for bearings in the QJ 2, QJ 3 and QJ 10 series
  • Fa ≥ 1,78 Fr for bearings in the QJ 12 series

Thrust bearings with radial freedom in combination with a radial bearing (fig. 1):

  • P = 1,07 Fa for bearings in the QJ 2, QJ 3 and QJ 10 series
  • P = 0,81 Fa for bearings in the QJ 12 series


Perform calculations
Equivalent static bearing load

For additional
information
(→ Equivalent static bearing load)
P0 = Fr + Y0 Fa

Symbols

C0
basic static load rating [kN] (→ product table)
dmbearing mean diameter [mm]
= 0,5 (d + D)
e
calculation factor (→ product table)
Faaxial load [kN]
Famminimum axial load [kN]
kaminimum load factor (→ product table)
Frradial load [kN]
n
rotational speed [r/min]
P
equivalent dynamic bearing load [kN]
P0
equivalent static bearing load [kN]
X, Y0, Y1, Y2calculation factors (→ product table)
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