Dynamic axial load carrying capacity
Double row and double row full complement cylindrical roller bearings with flanges on both the inner and outer rings can support axial loads up to Fa ≤ 0,25 Fr in addition to radial loads.
The axial load carrying capacity is determined by the lubrication condition, operating temperature and heat dissipation at the roller end / flange contact.
The formulae below are valid for normal operating conditions:
- ΔT ≈ 60 °C between the bearing operating and ambient temperature
- specific heat loss ≈ 0,5 mW/mm2
- viscosity ratio κ ≥ 2
Permissible axial loads
| Conditions | Mechanical limitations | Thermal limitations |
| Continuous |
Fap max ≤ 0,0023 D1,7
|
|
| Brief periods |
Fap brief ≤ 2 (Fap, Fap oil, Fap max)
|
|
| Occasional peak loads | Fap peak ≤ 3 (Fap, Fap oil, Fap max) | |
Symbols
| A | reference surface [mm2]
= π B (D + d) |
| B | bearing 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]
|
| Fap | permissible axial load [kN]
|
| Fap brief
| permissible axial load for brief periods [kN]
|
| Fap max | maximum permissible axial load set by mechanical limitations [kN]
|
| Fap oil
| permissible axial load in circulating oil applications [kN]
|
| Fap peak | permissible axial peak load [kN] |
| Fr | radial load [kN] |
| k1 | lubrication factor
= 0,35 for oil lubrication = 0,2 for grease lubrication |
| k2 | lubrication factor
= 0,1 for oil lubrication = 0,06 for grease lubrication |
| n | rotational speed [r/min] |
| VS
| amount of oil flow [l/min] |
