Page 366 - SKF-bearing-housings

Split plummer block housings SONL series

capacity, page 44). The permissible load can Operating speed
only be exploited if the cap bolts are tightened The permissible operating speed of the incor-
at least to the torque values listed in table 3. porated bearing is not limited by the housing.
The load P a is the axial breaking load of the
housing. If the incorporated bearing is
mounted on a sleeve, check the permissible Shaft specifications
axial load for the sleeve. For bearings mounted on an adapter sleeve,
For housings made of spheroidal graphite the recommended shaft tolerance class is
cast iron, the values obtained from table 2 h9V E . A cylindricity tolerance of IT5/2 is satis-
on page 361 should be multiplied by a factor factory. The same specifications are applicable
of 1,8. for the seats of labyrinth seal shaft sleeves.
For bearings mounted on a cylindrical seat on
Additional housing support stepped shafts († fig. 12), follow the guide-
When loads act at angles between 55° and lines in the SKF catalogue Rolling bearings for
120°, or when the axial loads are greater than the bearing seat. The bore of the shaft sleeve
5% of P 180° († table 2 on page 361), the hous- of the inboard labyrinth seal is in accordance
ing should be pinned to the support surface or with the F7 tolerance class and fits bearing
a stop should be provided to counter the load. seats machined to typical tolerances. The bore
The dowel pins or stop should be sufficiently of the shaft sleeve of the outboard labyrinth
strong to accommodate the loads acting par- seal is in accordance with the H7 t olerance
allel to the support surface. class and fits shafts machined to the h9V E tol-
Recommendations for the position and size erance class.
of the holes to accommodate dowel pins are For bearings mounted on a cylindrical seat
provided in table 8 on page 368. on plain shafts, the bore of the shaft sleeves of
the labyrinth seals is in accordance with
Load carrying capacity of the cap bolts F7 tolerance class and fits bearing seats
Approximate values for the yield points for four machined to typical tolerances.
cap bolts are provided in table 3. The values in
table 3 apply to 8.8 class cap bolts, which are
supplied with SONL housings.
Fig. 12
Operating temperature
Shaft specifications
The permissible operating temperature is
mainly limited by the seals († table 1, page Outboard shaft Inboard shaft sleeve,
bore tolerance
357), the oil level gauge and the lubricant. For sleeve, bore class F7
tolerance class H7
temperature limits of SKF bearings and lubri-
cants, refer to the product information avail-
able online at skf.com/bearings. The permis-
sible operating temperature for the oil level
gauge is 110 °C (230 °F).
The housing material does not have any (tolerance
additional temperature limits, except for very d b h9 E d a class as for
low temperature applications where impact the bearing
seat)
strength could be a factor.
The housing paint is heat resistant up to
80 °C (175 °F) material temperature or 100 °C
(210 °F) ambient temperature.
When temperatures outside the permissible
range are expected, contact the SKF application
engineering service.

362