IBC Cylindrical Roller Bearings - Spekuma Kullager AB

Lubrication period t grease
Cylindrical roller bearing design
single row with cage
full complement
Lubrication periods 46-502
The grease fatigue life ascertained according to picture
40-506 decreases with the grease temperature coefficient
a 3f according to picture 40-504.
Besides the temperature, further grease service life-reduction
factors are also of importance:
– vertical shaft 0.5 – 0.7
– rotating outer ring 0.6
– shock impact loads, 0.1 – 0.9
strong vibrations, oscillations
– Influence of high loads 0.1 – 1.0
C/P between 3 and 10
– Impurity 0.9
– Air flow through the bearing 0.1 – 0.7
After comparing L na bearing with L h grease relubrication may
seem sensible according to the grease service life. This
depends on the ratio at of the grease operating temperature
(bearing temperature on the inner ring t b ) to the max.
grease temperature t limit . A service life reduction of the
grease is reached from t limit on (mostly from 70 °C = 1, e.g.,
with lithium soap greases on mineral oil basis; with synthetic
products a considerable deviation is possible).
(With lasting a t = 2 no considerable grease service life
is possible).
With long-term stress at short-term max. limit temperature
values as shown by grease manufacturers the grease
service life is extremely low.
Note
Changes in lubricant properties are possible, even with the
same lubricants and from order to order. Hence, IBC can
neither be held responsible for the lubricants themselves
nor for their operational steadiness.
IBC INDUSTRIAL BEARINGS AND COMPONENTS 17