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Loads

There are no standardized calculation methods internationally for calculating basic load ratings for polymer ball bearings. According to the current state of technology, a bearing rating life calculation is not possible.
For low speeds (n < 25 r/min), the static load limit is to be used.
 Dynamic load limit The dynamic load limit is an indication of the operational load that the bearing can accommodate in the majority of applications under standard conditions. The dynamic load limit depends on the operating conditions and needs to be adjusted under the following conditions: operating temperature T > 50 °C (120 °F) rotational speed n > 20% of the limiting speed nlim (→ product table) The adjusted dynamic load limit can be estimated by using Clima = fT fn C Calculation example Bearing 6301/HR11TN, n = 650 r/min, T = 90 °C (195 °F) From the product table: Clim = 0,31 kN nlim = 1 300 r/min From diagram 1: with T = 90 °C (195 °F) and rings made of POM → fT ≈ 0,87 with n/nlim: (650/1 300) x 100 = 50% → fn ≈ 0,85 Clima = 0,87 x 0,85 x 0,31 = 0,229 kN Static load limit The static load limit is the maximum load that a bearing can accommodate at standstill without sustaining damage to the balls or raceways. It depends on the operating temperature and needs to be adjusted at operating temperatures T > 50 °C (120 °F). The adjusted static load limit can be estimated by using C0lima = fT C0

Symbols

 Clim dynamic load limit [kN] (→ product table) Clima adjusted dynamic load limit [kN] C0lim static load limit [kN] (→ product table) C0lima adjusted static load limit [kN] fn adjustment factor for speed (diagram 1) fT adjustment factor for operating temperature (diagram 1) n rotational speed [r/min] nlim limiting speed [r/min] (→ product table) T operating temperature [°C (°F)]