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Loads

Minimum load

For additional information
→ Requisite minimum load


Perform calculations

Equivalent dynamic bearing load

For additional information
→ Equivalent dynamic bearing load, P
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 functionality, 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 clearance in the housing 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 load
P0 = Fr + Y0 Fa

Symbols

A
minimum load factor (→ product table)
dmbearing mean diameter [mm]
= 0,5 (d + D)
e
calculation factor (→ product table)
Faaxial load [kN]
Famminimum axial load [kN]
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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