5-34
5-2-4 Allowable Loads on Servomotor Shafts
The allowable loads on Servomotor shafts are shown in the following table. Operate the Servomotor at
no more than the allowable radial and thrust loads. At the time of assembly, assemble the Servomotor at
no more than the momentary maximum radial and thrust loads (static pressure).
Servomotor
Momentary allowable
radial load
(static pressure)
Momentary allowable
thrust load
(static pressure)
Allowable radial
load
Allowable thrust
load
N
N
N
N
R88M-U03030
j
186
127
68
54
R88M-U05030
j
186
127
68
54
R88M-U10030
j
186
127
78
54
R88M-U20030
j
490
176
245
74
R88M-U30030
j
490
176
245
74
R88M-U40030
j
490
176
245
74
R88M-U75030
j
735
392
392
147
Note 1. The allowable loads are the same for motors with brakes.
Note 2. The allowable radial load is the value at a point 5 mm from the end of the shaft.
Radial load
Thrust load
5 mm
Note 3. The allowable radial and thrust loads are values determined with a service life of 20,000 hours
taken as a criteria.
Note 4. The service life of bearing grease is 20,000 hours at a Servomotor ambient temperature of
40
°
C, and under the rated operating conditions.
Note 5. Absolutely do not impact the Servomotor or the output shaft by striking them with an imple-
ment such as a hammer. Doing so will damage the Servomotor and encoder bearings.
Note 6. Make sure that the radial load is within the allowable range when there is a radial load applied.
If the Servomotor is operated at more than the allowable radial load, the shaft may suffer dam-
age due to fatigue.
Note 7. Applying an excessive load even once can damage the bearings and eventually cause a
breakdown.
Specifications
Chapter 5
