Page 412 - SKF-bearing-housings

Split pillow blocks SAF and SAW series

Shaft specifications Lubrication
Table 6 lists the recommended shaft diameter
tolerances. The values d a , d b and d c are listed SAF and SAW pillow (plummer) blocks can
in the product tables starting on page 418. accommodate grease, oil bath or circulating
The tolerance class for the bearing shaft seat oil lubrication systems. Any sealing solution
should be selected from the SKF catalogue can be used with grease lubrication, while for
Rolling bearings. oil lubrication SKF does not recommend using
labyrinth rings in the LER series.
The lubricant should be selected based on
Attachment bolt recommendations the operating conditions of the bearing. For
In typical applications, 8.8 class (SAE J429, additional information about lubricant selec-
Grade 5) hexagon head bolts can be used tion, refer to the product information available
together with washers. If the load does not act online at skf.com/bearings.
perpendicularly toward the base, it may be
necessary to use stronger, 10.9 class
(SAE J429, Grade 8) bolts. Initial grease fill
SKF housings can withstand loads resulting If no other requirements exist, the free space
from tightening the attachment bolts to the in the bearing should be completely filled with
torque values recommended by bolt manufac- grease and the free space in the housing
turers. SKF cannot guarantee that tightening should be filled to 20 to 40% of its volume.
to the recommended value will provide suffi- A 40% grease fill is required when bearings
cient anchoring. Make sure that attachment have to be relubricated from the side, while
bolts, dowels or stops, and a sufficiently a 20% grease fill is used when bearings are
strong support can accommodate all occurring relubricated via the outer ring.
loads. For highly contaminated environments and
slow speeds, fill the housing to 70 to 80%. For
best protection again contaminants, use the
SKF three-barrier solution († page 39). For
additional information, contact the SKF appli-
cation engineering service.
Table 6
Quantities for 20% and 40% grease fills are
Recommended shaft diameter tolerances listed in tables 7 and 8. The values are valid
3
for a typical lithium grease (about 0.57 oz/in ).
Nominal Diameter tolerance limits
diameter Adapter Cylindrical mounting The grease to fill labyrinth seals or taconite
over incl. mounting heavy-duty seals is not included. For sealed
d a d b and d c
high low high low bearings, the values have to be adjusted.
In most applications, the initial grease fill
in.
will adequately lubricate the bearing until the
grease is exchanged during the next planned
1 0.000 –0.002 – –
1 /2
maintenance interval.
1 2 0.000 –0.003 0.000 –0.003
2 4 0.000 –0.004 0.000 –0.003
4 6 0.000 –0.005 0.000 –0.003
6 10 0.000 –0.006 0.000 –0.004
10 15 0.000 –0.006 0.000 –0.005
15 0.000 –0.006 0.000 –0.006

408