Load carrying capacity
SONL housings are intended for loads acting perpendicularly toward the support surface. The housings should always be supported over the entire base. Perpendicular loads acting towards the base are limited only by the bearing. If loads acting in other directions occur, be sure that the magnitude of the load is permissible for the housing, the cap bolts and the attachment bolts. When housings are subjected to cyclic loads or dynamic imbalance, contact the SKF application engineering service.
Breaking loads and safety factors
Guideline values for the breaking loads P for housings made of grey cast iron are listed in the product tables for bearings on an adapter sleeve and for bearings on a cylindrical seat. To obtain the permissible load for a housing, the appropriate breaking load value should be divided by a factor based on the safety requirements. In general engineering, a safety factor of 6 is typical (→ Load carrying capacity). The permissible load can only be exploited if the cap bolts are tightened at least to the torque values listed in table 1. The load Pa is the axial breaking load of the housing. If the incorporated bearing is mounted on a sleeve, check the permissible axial load for the sleeve.
For housings made of spheroidal graphite cast iron, the values obtained from table 1 should be multiplied by a factor of 1,8.
Additional housing support
When loads act at angles between 55° and 120°, or when the axial loads are greater than 5% of P180° (product tables for bearings on an adapter sleeve and for bearings on a cylindrical seat), the housing should be pinned to the support surface or a stop should be provided to counter the load. The dowel pins or stop 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 2.
Load carrying capacity of the cap bolts
Approximate values for the yield points for four cap bolts are provided in table 3. The values apply to 8.8 class cap bolts, which are supplied with SONL housings.