Dynamic axial load carrying capacity

High-capacity cylindrical roller bearings with flanges on both the inner and outer rings can support axial loads up to Fa ≤ 0,5 Fr in addition to radial loads.
The axial load carrying capacity is determined by the ubrication condition, operating temperature and heat dissipation at the roller end / flange contact.
The formulae below are valid for normal operating conditions, i.e.:
  • ΔT ≈ 60 °C between the bearing operating and ambient temperature
  • specific heat loss ≈ 0,5 mW/mm2
  • viscosity ratio κ ≥ 2
  • misalignment ≤ 1 minute of arc
    For misalignment > 1 minute of arc, contact the SKF application engineering service.

Permissible axial loads

ConditionsMechanical limitationsThermal limitations
ContinuousFap max ≤ 0,0035 D1,7Circulating oil lubrication


Other lubrication
  • Reference surface A ≤ 50 000 mm2
  • Reference surface A > 50 000 mm2
Brief periods

Fap brief ≤ 2 (Fap, Fap oil, Fap max)

  • provided it does not increase the bearing operating temperature > 5 °C temporarily
  • “brief period” is the approximate time for 1 000 revolutions to take place

Occasionalpeak loadsFap peak ≤ 0,0085 D1,7

Symbols

Areference surface [mm2]
= π B (D + d)
Bbearing width [mm]
C0
basic static load rating [kN] (→ product table)
d
bearing bore diameter [mm]
D
bearing outside diameter [mm]
ΔTS
temperature difference between incoming and outgoing oil flow [°C]
Faaxial load [kN]
Fappermissible axial load [kN]
Fap brief
maximal axial load for brief periods [kN]
Fap peakmaximal occasional axial peak load [kN
Fap maxmaximal constantly acting axial load [kN]
Fap oil
maximum permissible axial load in circulating oil applications [kN]
Frradial load [kN]
k1lubrication factor
= 1,5 for oil lubrication
= 1 for grease lubrication
k2lubrication factor
= 0,15 for oil lubrication
= 0,1 for grease lubrication
nrotational speed [r/min]
VS
amount of oil flow [l/min]
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