Chapter 2 Installing Of Motor; Checking Procedure; Main Bearing Specification - Harmonic Drive CSF-3 Series Manual

Chapter 2
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)
(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
Ball pitch
circle Offset
diameter
（R）
（dp）
m m
3 0.0077 0.0041

Chapter 2 Installing of Motor

Installing of Motor
permissible moment (Mc)
≤
Basic rated load
Basic dynamic Basic static rated
rated load load
×10 N ×10
２
6.65 4.24
Moment
Moment rigidity
load
N Nm Nm／rad
２
0.27 0.9×10
3
Tolerable radial
load thrust load
N
2 36
Tolerable
N
130