| Previous and new -a comparison The performance enhancements of SKF Explorer cylindrical roller bearings manufacturer can best be demonstrated by life calculations for the bearing NU 207 ECP. For the same operating conditions the life of •the previous standard NU 207 ECP with - a basic dynamic load rating C = 48,4 kN, and - a fatigue load limit Pu = 6,1 kN and • the SKF Explorer bearing NU 207 ECP with - a basic dynamic load rating C = 56 kN, and - a fatigue load limit Pu = 6,1 kN are calculated. The operating conditions are assumed to be • an equivalent dynamic bearing load P = 4,8 kN, • a viscosity ratio k = 2, and • a contamination level r)c = 0,4. Previous standard bearing For rc (Pu/P) = 0,4 (6,1/4,8) = 0,5 using the black values on the x axis in diagram M and k = 2 aSKF « 3,2 so that the life becomes L10m = asKF (C/P)10/3= 3,2 (48,4/4,8)10/3 = 7 080 millions of revolutions SKF Explorer bearing For rc (Pu/P) = 0,4 (6,1/4,8) = 0,5 using the blue values on the x axis in diagram pj and k = 2 asKF - 6,2 so that the life becomes L10m = asKF (C/P)10/3 = 6,2 (56/4,8)10/3 = 22 320 millions of revolutions |