Load carrying capacity
SBD plummer block housings and THD take-up housings are designed to accommodate radial loads acting in all directions as well as axial loads acting in both directions on the locating bearing position.
For SBD housings, the permissible radial loads depend on the bearing, the housing and the attachment bolts. Loads acting perpendicularly to the support surface are limited only by the bearing. SBD housings must be supported over the entire base area.
For information about the load carrying capacity of THD take-up housings, contact SKF application engineering service.
Breaking loads and safety factors
Guideline values for the breaking loads of housings made of spheroidal graphite cast iron are provided in table 1. To obtain the permissible load for a housing, the appropriate breaking load value should be divided by a factor selected based on the safety requirements. In general engineering, a safety factor of 6 is typical (→ Load carrying capacity).
For SBD housings made of cast steel, the values obtained from table 1 should be multiplied by a factor of 1,25. For housings made of grey cast iron, the values should be multiplied by a factor of 0,63.
The load Pa is the axial breaking load of the housing. If the incorporated bearing is mounted on a sleeve, the permissible axial load for the sleeve must be checked.
Additional housing support for SBD plummer block housings
When the housing is subjected to loads acting parallel to the support surface, it may be necessary to provide a stop to counter the load.
When loads act at angles between 55° and 120°, or when the axial loads are greater than 5% of P180° (table 1), a stop should be provided to counter the load. The stop should be sufficiently strong to accommodate the loads acting parallel to the support surface.