Load carrying capacity
SKF ConCentra roller bearing units are intended for loads acting perpendicularly toward the support surface. If the bearing unit is supported over its entire base and the loads are purely perpendicular, loads are limited only by the bearing. If loads acting in other directions occur, or if the bearing unit is not supported over its entire base, be sure that the magnitude of the load is permissible for the housing and the attachment bolts. If heavy loads, not acting perpendicularly toward the support surface, are expected, additional supports are recommended to relieve the attachment bolts of the load.
Breaking loads and safety factorsGuideline values for the breaking loads of housings in the SYNT series are listed in table 1. Guideline values for the breaking loads of housings in the FYNT series are listed in table 2. To obtain the permissible load for a housing, the appropriate breaking load should be divided by a factor based on the safety requirements. In general engineering, a safety factor of 6 is typical (Load carrying capacity).
Axial holding powerThe axial holding power of an SKF ConCentra roller bearing unit depends on the friction between the shaft and stepped sleeve. It is therefore also dependent on the number of grub (set) screws in the mounting collar (table 3).
When mounted correctly, the bearing units can withstand typical shock loads equivalent to the requisite axial holding force. However, the maximum operating axial load is limited by the rated bearing life through the equivalent bearing load P (Relubrication).
Additional housing support for bearing units in the SYNT seriesWhen the housing is subjected to loads acting parallel to the support surface, it may be necessary to pin the housing to the support surface or to provide a stop to counter the load.
In cases where the resultant radial load is between 55° and 120° or when the axial load is greater than 5% of P180° (table 1), the bearing unit should be pinned to its support surface. The dowel pins should be sufficiently strong to accommodate the loads acting parallel to the support surface.
Recommendations for the position and size of the holes to accommodate dowel pins are provided in table 4.