2-3 Verifying and examining load weights
Selection guidelines
2-6
1
2
3
4
5
6
7
8
9
10
11
Apx
Sel
ect
ion gui
del
ines
Static equivalent radial load
Static safety coefficient
Generally, the static equivalent load is limited by the basic static rated load (Co). However, the specific limit should
be calculated according to the using conditions and required conditions. In this case, calculate the static safety
coefficient (fs) by formula (10).
Table 4 shows general values representing using conditions. Calculate the static equivalent radial load (Po) by
formula (9).
Formula (10): Static safety coefficient
Po
Co
fs
=
Symbols used in the formulas
fs
Static safety coefficient ―
See Table 4.
Co
Basic static rated load
N(kgf)
See Table 1.
Po
Static equivalent radial
load
N(kgf)
Obtained by formula
(9).
Formula (9): Static equivalent radial load
max
max
max
0.44Fa
dp
2M
Fr
Po
+
+
=
Symbols used in the formulas
Fr
max
Max. radial load
N(kgf)
See Fig.1.
Fa
max
Max. axial load
N(kgf)
See Fig.1.
M
max
Max. moment load
N·m
(kgf·m)
Refer to the
maximum load
weight
calculation
methods.
dp
Pitch circle diameter of
a roller
mm
See Table 1.
Table 4 Static safety coefficient
Using conditions
fs
High rotational
accuracy is required,
etc.
≥3
Operation subject to
impact/vibration
≥2
Normal operation
≥1.5
