Chapter 2 Installing of Motor
3
Chapter 2
Installing of Motor
A precision cross roller bearing is built in the unit type and the gear head type to directly support the
external load (output flange) (precision 4-point contact ball bearing for the CSF-mini series).
Check the maximum load moment load, life of the bearing and static safety coefficient to fully bring out
the performance of the unit type.
2-1 Checking procedure
(1) Checking the maximum load moment load
Obtain the maximum load moment load (Mmax).
⇓
Maximum load moment load (Mmax)
≤
permissible moment (Mc)
(2) Checking the life
Obtain the average radial load (Frav) and the average axial load (Faav).
⇓
Obtain the radial load coefficient (x) and the axial load coefficient (y).
⇓
Calculate the life and check it.
(3) Checking the static safety coefficient
Obtain the static equivalent radial load coefficient (Po).
⇓
Check the static safety coefficient.
2-2 Main bearing specification
Table 1 Specification
M
odel
N
o.
Ball pitch
circle
diameter
（
dp
）
Offset
（
R
）
Basic rated load
Moment
load
Moment rigidity
Tolerable radial
load
Tolerable
thrust load
Basic dynamic
rated load
Basic static rated
load
m
m
×10
２
N
×10
２
N
Nm
Nm
／
rad
N
N
3
0.0077
0.0041
6.65
4.24
0.27
0.9×10
2
36
130
