Ložiskové jednotky NTN-SNR

SNR Industry 27 For a simultaneously occurring radial and axial static load, an equivalent load (P 0 ) must be determined: P 0 = X 0 • F r + Y 0 • F a [kN] but: P 0 = Fr, if ≤ 0.8 P 0 = static equivalent load [kN] X 0 = static radial factor Y 0 = static axial factor For all bearing inserts, the following applies: X 0 = 0.6 Y 0 = 0.5 Using the ratio ƒs it can be checked if sufficient static dimensioning for the insert has been ensured: ƒs = Some standard values are: ƒs = 0.7 minimal demands for running smoothness and rotating movement ƒs = 1.0 occasional rotating bearing, normal demands for running smoothness ƒs = 2.0 high demands for running smoothness It should be noted that this ratio does not provide any assurance against a break or similar, but instead, it is assurance against excessive local deformation in the rolling contact (ball/raceway). Calculating bearing life When calculating bearing life for bearing units, the following applies: L 10 = ( ) 3 [10 6 revolutions] If the bearing life should be specified in hours, the following applies: L10 h = ( ) 3 · [h] n = speed [min -1 ] F a Static equivalent load Cr P Cr P C 0r P 0 F r 10 6 60n