Page 97 - Rollingbearings
P. 97
Size selection based on rating life
Diagram 8
Factors inluencing the life modiication factor, a SKF
qCw p
L nm = a 1 a SKF L 10 = a 1 a SKF K
<Pz
a
Life modiication factor a SKF
SKF
50,0
Area B
20,0
10,0
5,0
k = 4
2
2,0
Area C 1
0,8
0,6
1,0
0,5
0,4
0,5
0,3 Bearing size
Area A
Cooling or higher viscosity
0,2 0,2
B.3
0,15
0,1
0,1
0,05
0,005 0,01 0,02 0,05 0,1 0,2 0,5 1,0 2,0 5,0 SKF Basic
design
P bearings
u
ƞ –––
c
P
SKF
0,005 0,01 0,02 0,05 0,1 0,2 0,5 1,0 2,0 Explorer
P bearings
u
η –––
c
P
High load, dirty Low load, clean
Reduced load or larger bearing, or improved cleanliness
Increased load or smaller bearing, or reduced cleanliness
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