Output Bearing Operating Life - Harmonic Drive SHG Series Manual

4.7 Output Bearing Operating Life

The operating life of the output bearing can be calculated using equation 42.1.
Equation 42.1
with:
L [h] = Operating life
10
n [rpm] = Average output speed (equation 42.2)
av
C [N] = Dynamic load rating see section 3.3.6
P [N] = Dynamic equivalent load (equation 43.1)
C
f = Operating factor (table 42.3)
W
B = Bearing type (table 42.4)
Average Output Speed
Equation 42.2
Table 42.3
Load conditions
No impact loads or vibrations
Normal rotating, normal loads
Impact loads and / or vibrations
Table 42.4
Bearing type
Cross roller bearings
Four point contact bearings
42
10 C
6 B
( )
.
L =
60 . n . P
f
10
av w C
| n | t + | n | t + ... + | n | t
1 1 2 2 n n
n =
t + t + ... + t + t
av
1 2 n p
f
W
1 ...1.2
1.2 ... 1.5
1.5 ... 3
B
10
3
3
1021387 12/2018 V02