tailieunhanh - Rolling bearings P2

Schaeffler KG introduced the “Expanded calculation of the adjusted rating life” in 1997. This method is standardised in accordance with DIN ISO 281, Appendix 1. | Page Fitting and dismantling Handling. 167 Storage of rolling bearings . 167 Unpacking of rolling bearings . 168 Compatibility miscibility . 168 Cleaning of rolling bearings . 168 Fitting. 169 Guidelines for fitting . 169 Fitting of rolling bearings with cylindrical seats . 170 Fitting of rolling bearings with tapered bore . 173 Guidelines for dismantling. 174 Dismantling of rolling bearings on cylindrical seats. 175 Dismantling of rolling bearings with tapered bore . 177 Schaeffler Group Industrial HR1 I 31 Load carrying capacity and life Fatigue theory as a principle Caution Schaeffler KG introduced the Expanded calculation of the adjusted rating life in 1997. This method is standardised in accordance with DIN ISO 281 Appendix 1. The method will be incorporated in the next version of the international standard ISO 281. The basis of the rating life calculation in accordance with ISO 281 is Lundberg and Palmgren s fatigue theory which always gives a final rating life. However modern high quality bearings can exceed by a considerable margin the values calculated in accordance with ISO 281 under favourable operating conditions. Ioannides and Harris have developed a further model of fatigue in rolling contact that expands on the Lundberg Palmgren theory and gives a better description of the performance capability of modern bearings. The method Expanded calculation of the adjusted rating life takes account of the following influences the bearing load the fatigue limit of the material the extent to which the surfaces are separated by the lubricant the cleanliness in the lubrication gap additives in the lubricant the internal load distribution and frictional conditions in the bearing. The influencing factors especially those relating to contamination are extremely complex. A great deal of experience is essential for an accurate assessment. For further advice we recommend that you consult the engineering service of Schaeffler Group Industrial. The tables and diagrams can