REXNORD - MARBETT - MCC
B76
fs
Co
Po
Co
Po
fs = ——
5
1
2
0,4
0,5
1
2
0,5
≥ 1,5
≥ 1,5
≥ 2
≥ 1
Po
Fr
Fa
Yo
A
B
C
D
Po = 0,6 • Fr + 0,5 • Fa
Po =
Fr + Yo • Fa
1200
Fr
Fa
Fa
Fr
Calculation data
Static load capacity control
Statically stressed bearings
In rolling-contact bearing technology the condition of static load is considered to exists when:
- The bearing does not rotate and is subjected to permanent loads or intermittent ones (impacts).
- The bearing is subjected to loads and slow oscillating movements.
- The bearing rotates under load at a very low speed and for short periods.
- The bearing rotates under load and must withstand strong impacts acting in the course of
one revolution.
The static safety coefIcient fs must not exceed the recommended values given in Table 5 in
order to obtain a satisfactory performance of the bearings. CoefIcient fs gives the safety margin
against excessive permanent deformation of the revolving parts of the bearing.
Equivalent static load Po
calculation
Table 5
- Static safety coefIcient fs for MB bearings
= static safety coefIcient.
= static load coefIcient (N). The values are given in the support
dimensional tables.
= equivalent static load (N). See calculation formula given below.
Revolving bearings
Type of
operation
Noise level
not important
Normal noise
level operation
²ow noise
level operation
Non revolving
bearings
Smooth operation without vibration
Normal operation
Impact loads operation
= equivalent static load (N).
= radial load on the bearing (N).
= axial load on the bearing (N).
= see table 4.
Bearing
type
²oad direction on
the bearing
Equivalent dynamic load P (N)
calculation formula
±f Po < Fr, then assume Po = Fr.