Page 787 - Rollingbearings

Permissible speed
Temperature Permissible speed

limits
The speed ratings in the product table
indicate:
The permissible operating temperature for
spherical roller bearings can be limited by: • the reference speed, which enables a
quick assessment of the speed capabilities
• the dimensional stability of the bearing from a thermal frame of reference
rings • the limiting speed, which is a mechanical
• the seals limit that shoud not be exceeded unless
• the lubricant the bearing design and the application are
adapted for higher speeds
Where temperatures outside the permissible
range are expected, contact SKF For additional information, refer to
Operating temperature and speed, page 130
Bearing rings

SKF spherical roller bearings undergo a spe-
cial heat treatment The bearings are heat
stabilized up to at least 200 °C (390 °F).

Seals

The permissible operating temperature for
seals depends on the seal material:
• NBR: –40 to +90 °C (–40 to +195 °F)
Temperatures up to 120 °C (250 °F) can
be tolerated for brief periods
• HNBR: –40 to +150 °C (–40 to +300 °F)
• FKM: –30 to +200 °C (–20 to +390 °F)

Typically, temperature peaks are at the seal
lip

Lubricants
9
Temperature limits for the greases used in
sealed SKF spherical roller bearings are pro-
vided in table 1, page 777 For temperature
limits of other SKF greases, refer to Selecting
a suitable SKF grease, page 116
When using lubricants not supplied by
SKF, temperature limits should be evaluated
according to the SKF trafic light concept
(page 117)

785