SKF Cooper split roller bearings and bearing units

Plummer (pillow) block housings, also known as pedestals, are the most common method of mounting split roller bearings in cartridges. Designs and variants Plummer block housings can be used for both the locating and non-locating bearing position and are available in the following designs: • two-bolt housings • four-bolt housings ( fig. 1 ) • interchangeable housings – SNC500 series – SDC3100 series – SAFC500 series • interchangeable angled housings – SNQ series – SDQ series – SAFQ series ( fig. 2 ) Interchangeable housings Interchangeable housings are designed with height-to-centre and bolt hole configura- tions that match industry standard SN, SD, and SAF plummer block units. However, the footprint, overall height, and length on the shaft may differ and should be checked against the available space. The housings: • may be used to economically replace existing units with non-split bearings • may be incorporated into new machinery where the envelope dimensions of these housings are desirable • typically contain split cylindrical roller bearings in the 01/01E or 02/02E series • may accommodate bearings and car- tridges of different series and sizes if the loading conditions permit • sometimes contain bearings and car- tridges with a reduced outside diameter in order to provide adequate plummer block base thickness. However, the load ratings of the standard bearings of the same bore size still apply. Angled housings Angled housings are designed for a location where there is a particularly difficult access for mounting the plummer block base. The angled joint (tenon-style) of the plummer block allows the housing base to be slid into position under the shaft without the need to hoist it, and is therefore suitable where: • there is no other means (such as remova- ble packing) to create extra height between the mounting structure and the shaft • there is no possibility of putting the hous- ing base under the shaft in an area of greater clearance and moving axially into position. Housing materials SDC, SAFC, SNQ, SDQ, and SAFQ housings are made of ductile iron (grade EN-GJS-400/18 in accordance with BS EN 1563), as standard. All other housings, including SNC series are made of: • grey cast iron (grade EN-GJL-250 in accordance with BS EN 1561), as standard • ductile iron, e.g. for impact or pulsating loads, available on request • steel, e.g. for impact or pulsating loads, available on request Fig. 2 Angled plummer block housing (SAFQ) Fig. 1 Four-bolt plummer block housing 4 Plummer block housings 106