4
2.2 Static calculation
A static calculation is sufficient if the bearing is loaded at standstill. A bearing with sufficient load carrying capacity has been selected if the recom-
mended static safety is achieved.
1
F
a
F
r
M
+ +
C
oa
C
or
C
om
S
st
=
2. Calculation basis
All forces and moments acting on the bearing are to be summarized by vectorial addition into centrally acting forces F
a
and F
r
as well as resulting
moments M
a
. For complex load cases and load collectives with variable load and speed, we will be pleased to perform the calculation for you.
2.1 Terms, unit of measurement
C
dynamic load rating
(N)
C
0
static load rating
(N)
F
a
centrically acting axial force
(N)
F
r
centrically acting radial force
(N)
KKØ
Ball race diameter = (D + d)/2
(M)
L
n
nominal life
(h)
M
k
tilting moment
(Nm)
n
rotational speed
(min – 1)
P
dynamic equivalent load
(N)
P
0
statically equivalent laod
(N)
S
st
static safety
X
Radial factor
Y
Axial factor
Z
Moment faktor
2.2.1 Axial and radial factors
2.2.2 Recommended static safety S
st
X
0
Y
0
Alll bearing types
1.0
0.47
Ball diameter > 6
S
st
With quiet, vibration-free operation
> 1.8
During normal operation
> 2.5
With pronounced shock loads and high requirements on running accuracy
> 8.0