Harmonic Drive MMA Series, Руководство пользователя, Страница: 44 / 62

3-2 Notices on handling
3-3
Ins
ta
lling t
he
m
ot
or
3
Appe

Recommended tightening torque and transmission torque
Model
Item
MMAB09 MMAB12
Output
shaft
motor
Output
shaft
motor
Number of bolts, size
4-M3 6-M4 4-M3 6-M5
Bolt
installation
P.C.D.
mm
28 102 36 132
Tightening
torque
N
･
m
2.0 4.5 2.0 9.0
kgf
･
m 0.20 0.46 0.20 0.92
Transmission
torque
N
･
m 23 215 30 446
kgf
･
m 2.4 22.0 3.1 45.5
Model
Item
MMAB15 MMAA21A
Output
shaft
Motor
Output
shaft
Motor
Number of bolts, size 4-M4 6-M6 4-M5 8-M8
Bolt
installation
P.C.D.
mm 50 158 74 226
Tightening
torque
N
･
m 4.5 15.3 9.0 37.0
kgf
･
m 0.46 1.56 0.92 3.8
Transmission
torque
N
･
m
70 755 167 2630
kgf
･
m 7.2 77.1 17.0 268.2
Note 1: The female thread material is assumed to withstand the bolt tightening torque.
2: Recommended bolt: Hexagonal bolt per JIS B 1176 Strength category: JIS B 1051 12.9 or higher
3: Calculation conditions Torque efficiency: 0.2 Tightening efficiency: 1.4 Tightening friction coefficient:
0.15
Precautions on installation
When designing the assembly, note that application of any abnormal or excessive force that causes
deformation of the installation surface may result in performance drop. To deliver optimal performance
of the MMA series motors, pay attention to the following points:

Warping and deformation on the mounting surface

Blockage caused by foreign matter

Burrs, rising and abnormal position accuracy around tapped mounting holes

Insufficient chamfering of mounting faucet joint

Abnormal circularity of mounting faucet joint