Ložiskové jednotky NTN-SNR

The bearing life of a UCP210 ball bearing unit under the following conditions: Radial load: F r = 2 kN Axial load: F a = 1.7 kN Normal operating condition speed: n = 1800 min -1 UCP210 ball bearing unit data: C r = 35.1 kN C 0 r = 23.2 kN Dynamic equivalent bearing load: P = X • F r + Y • F a [kN] with = = 0.073 and = = 0.85 From Table 1: with Fa/C 0r = 0.073, e is determined to be ≈ 0.28 with Fa/Fr = 0.85 > e = 0.28 → X=0.56 Y=1.55 P = 0.56 • 2 kN + 1.55 • 1.7 kN = 3.76 kN L 10h = ( ) • ( ) [h] it follows L 10h = ( ) • ( ) = 7532 h The theoretical bearing life of the bearing unit, under normal operating conditions, is 7532 hours. Example calculation Life calculation SNR Ball Bearing Units SNR Industry 28 F a C 0r 1.7 kN 23.2 kN C r P 35.1 3.76 10 6 60n 10 6 60x1800 F a F r 1.7 kN 2 kN 3 3