Page 447 - Rollingbearings

Temperature limits

Loads

Minimum load Symbols
q ν n ⎞ 2/3 q d m w 2
⎝ 100 ⎠
For additional F rm = k r ——— —— B bearing width [mm]
⎝ 1 000 ⎠

information d bearing bore diameter [mm]
† page 106
d m bearing mean diameter [mm]
= 0,5 (d + D)
Axial load carrying Bearings mounted on an adapter sleeve on plain shafts without
e calculation factor (product tables,
capacity a ixed abutment: page 450)
F = 0,003 B d F axial load [kN]
ap
provided the bearings are correctly mounted a
F ap maximum permissible axial load
[kN] 4
Equivalent F /F ≤ e † P = F + Y F F radial load [kN]
a
r
1 a
r
dynamic bearing F /F > e † P = 0,65 F + Y F F r minimum radial load [kN]
r
2 a
a
r
load rm
k r minimum load factor (product
tables)
For additional n rotational speed [r/min]
information P equivalent dynamic bearing load
† page 91
[kN]
P equivalent static bearing load [kN]
0
Equivalent static P = F + Y F Y , Y , Y calculation factors (product tables)
0 a
r
0
bearing load 0 1 2
ν oil viscosity at operating tempera-
ture [mm 2 /s]
For additional
information
† page 105
Temperature Cages Lubricants
Steel or brass cages can be used at the same Temperature limits for the greases used in
limits operating temperatures as the bearing rings sealed SKF self-aligning ball bearings are
and balls For temperature limits of polymer provided in table 1, page 441 For tempera-
cages, refer to Polymer cages, page 188 ture limits of other SKF greases, refer to
The permissible operating temperature for Selecting a suitable SKF grease, page 116
self-aligning ball bearings can be limited by: Seals When using lubricants not supplied by
SKF, temperature limits should be evaluated
• the dimensional stability of the bearing The permissible operating temperature for according to the SKF trafic light concept
rings and balls NBR seals is –40 to +100 °C (–40 to (page 117)
• the cage +210 °F) Temperatures up to 120 °C
• the seals (250 °F) can be tolerated for brief periods
• the lubricant Typically, temperature peaks are at the
seal lip
Where temperatures outside the permissible
range are expected, contact SKF

Bearing rings and balls
SKF self-aligning ball bearings are heat
stabilized up to 120 °C (250 °F)

445