Page 103 - Rollingbearings
P. 103
Size selection based on rating life
Diagram 14
Estimation of the rated viscosity ν 1
Rated viscosity v [mm 2 /s]
1
1 000
2
500 5
10
Low nd area
m
200 20
50
100 100 n [r/min]
50 200
Bearing size
20 500
1 000
1 500
2 000
3 000
B.3
10 10 000
5 000
20 000
High nd area
m
5 100 000
50 000
10 20 50 100 200 500 1 000 2 000
d = 0,5 (d + D) [mm]
m
■ Low nd m area, where nd m ≤ 10 000 mm/min.
At these lower nd values, AW or EP additives are needed to reduce wear.
m
■ High nd area, where nd ≥ 500 000 mm/min for d ≤ 200 mm, and
m
m
m
nd ≥ 400 000 mm/min for d > 200 mm.
m
m
At these higher nd values, operating temperature must be given more attention.
m
Certain bearing types, such as spherical roller bearings, tapered roller bearings and
spherical roller thrust bearings, normally have a higher operating temperature than
others, such as deep groove ball bearings and cylindrical roller bearings, under com-
parable operating conditions.
101
