43
1018856
08/2018 V04
7.3 Output Bearing
7.3.1 Lifetime Calculation for Continuous Operation
The operating life of the output bearing can be calculated using equation 43.1.
Equation 43.1
Table 43.2
with:
L
10
[h]
= Operating life
n
av
[rpm]
= Average output speed
C [N]
= Dynamic load rating,
see table “Output Bearing Ratings“
P
C
[N]
= Dynamic equivalent load
f
W
= Operating factor (Table 43.2)
Average output speed
n
av
=
|
n
1
|
t
1
+
|
n
2
|
t
2
+ ... +
|
n
n
|
t
n
t
1
+ t
2
+ ... + t
n
+ t
p
Load conditions
f
W
No impact loads or vibrations
1 ... 1.2
Normal rotating, normal loads
1.2 ... 1.5
Impact loads and/or vibrations
1.5 ... 3
Equation 43.3
Table 43.5
Type of bearing
B
Cross roller bearing
10/3
Four point bearing
3
At oscillating angles < 5° fretting corrosion may occur due to insufficient
lubrication. In this case please contact our sales engineer for counter-
measures.
Bearing type of selected products see “Output Bearing Ratings“ in the
appropriate product chapter.
Oscillating angle
Illustration 43.4
with:
L
OC
[h] = Operating life for oscillating motion
n
1
[cpm] = Number of oscillations/minute*
C [N] = Dynamic load rating. See table “Output Bearing“
in the appropriate product chapter
P
C
[N] = Dynamic equivalent load
ϕ
[Degree] = Oscillating angle
f
W
= Operating factor (Table 43.2)
* one oscillation means 2
ϕ
L
OC
=
10
6
60 . n
1
.
(
)
B
180
ϕ
.
C
f
w
. P
C
7.3.2 Lifetime Calculation for Oscillating Motion
The operating life at oscillating motion can be calculated using equation 43.3.
L
10
=
10
6
60 . n
av
.
( )
B
C
f
w
. P
C
