Page 920 - Rollingbearings

13 Spherical roller thrust bearings
Temperature Design contacting the housing during possible mis-
alignment SKF recommends the following
limits considerations guideline values for the recess diameter:

• D + 15 mm for bearings with an outside
The permissible operating temperature for Abutment diameter D ≤ 380 mm
spherical roller thrust bearings can be dimensions • D + 20 mm for bearings with an outside
limited by: diameter D > 380 mm

• the dimensional stability of the bearing The abutment dimensions d a min and D a max
washers listed in the product table, page 922, apply
• the lubricant for axial bearing loads F ≤ 0,1 C . Axial clearance in
a
0
For heavier bearing loads, it may be nec- bearing
Where temperatures outside the permissible essary to support the shaft and housing
range are expected, contact SKF washers over their entire side faces (d = d arrangements
a
1
and D = D ).
1
a
Bearing washers For heavy loads, where P > 0,1 C , the SKF spherical roller thrust bearings in face­
0
shaft washer bore must be fully supported to­face or back­to­back arrangements should
The washers of SKF spherical roller thrust by the shaft, preferably by an interference it be preloaded However, at the relatively low
bearings are heat stabilized up to 200 °C Even the housing washer should be radially speeds shown within the green area in
(390 °F) supported (ig. 4) diagram 1, the application can be designed
For additional information about dimen- to operate with a small axial clearance For
Lubricants sioning washer supports, contact the SKF these applications, bearings with a modiied
application engineering service shaft washer (designation sufix VU029)
For temperature limits of SKF greases, refer should be used Small axial clearance enables
to Selecting a suitable SKF grease, page 116 simple and cost­effective bearing arrange­
When using lubricants not supplied by ments to be used, e g for horizontal shaft
SKF, temperature limits should be evaluated Recessed housing applications at relatively low speeds, as no
according to the SKF trafic light concept bore for bearings external preload is necessary
(page 117) For additional information about bearing
with a stamped steel arrangements with axial clearance, contact
the SKF application engineering service
cage
Permissible speed For bearings itted with a stamped steel

window-type cage, the housing bore must
The speed ratings in the product table, be recessed (ig. 5) to prevent the cage from
page 922, indicate:

• the reference speed, which enables a
quick assessment of the speed capabilities Fig. 4 Fig. 5
from a thermal frame of reference Abutment dimensions Recessed housing bore for bearings with
• the limiting speed, which is a mechanical a stamped steel cage
limit that should not be exceeded unless
the bearing design and the application are
adapted for higher speeds

For additional information, refer to Operating
temperature and speed, page 130

D a D 1 F a d a d 1
D

13

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