Page 707 - SKF-bearing-housings

Design considerations

Load carrying capacity Additional housing support
When the housing is subjected to loads acting
Pillow (plummer) blocks parallel to the support surface, it may be nec-
SKF pillow block roller bearing units are essary to pin the housing to the support sur-
intended for loads acting perpendicularly face or to provide a stop to counter the load.
toward the support surface. If the bearing unit When loads act at angles between 55° and
is supported over its entire base and the loads 120°, or when the axial loads are greater than
are purely perpendicular, loads are limited 5% of P 180° († tables 4 to 6), the bearing unit
only by the bearing. should be pinned to the support surface. The
If loads acting in other directions occur, be dowel pins should be sufficiently strong to
sure that the magnitude of the load is permis- accommodate the loads acting parallel to the
sible for the housing and the attachment bolts. support surface.
Guideline values for the safe loads of the hous-
ings are provided in tables 4 to 6. The safe Flanged units
loads have been calculated using a safety fac- For the safe loads of flanged units, contact the
tor of 5 against fracture. SKF application engineering service.
If the bearing unit is not supported over its
entire base, the load carrying capacity for per-
pendicular loads may be affected. For addi-
tional information, contact the SKF application
engineering service.
For a purely axial force, static or dynamic,
the permissible load on the housing should not
exceed 65% of P 180° .

Table 6
Safe loads for FSYE series roller bearing units

P 90° P 135° P 180°
Shaft diameter Safe loads
from to in the direction of
P 90° P 135° P 180°
in. lbf.

2 7 /16 3 1 /2 17 200 8 800 9 500
2 11 /16 3 20 800 11 000 12 000
3 7 /16 3 1 /2 23 600 13 600 14 400
3 11 /16 4 26 800 16 200 16 600
4 7 /16 4 1 /2 29 600 18 600 19 200
4 15 /16 4 15 /16 32 800 20 600 21 200

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