4
3. 3 Attaching Load
■
BH6G2-
,
BH6G2-
RA
Screw
The shaft of the gearhead has been machined to an outer diameter tolerance
of h7 and is provided with a key slot for connecting the transmission parts.
When connecting the transmission parts, ensure that the shaft and parts
have a clearance fit, and secure with a screw to prevent the parts from
wobbling.
Note
Do not use excessive force, or hammer the transmission parts onto
the gearmotor shaft as damage may occur.
When using the output axis tip screw hole of a gearhead
Use a screw hole [M6, effective depth 12 mm (0.47 in.)] provided at the tip of
the output shaft of the gearhead as an auxiliary means for preventing the
transfer mechanism from disengaging.
Fixed screw
Screw
Spacer
Transmission parts
■
BH6G2-
RH
(Hollow shaft type)
When the load shaft is stepped
Load shaft
Hollow shaft
Spacer
Flat washer
Spring washer
Groove for retaining ring
Screw(M6)
When the load shaft is not stepped
Hollow shaft
Spacer
Flat washer
Spring washer
Groove for retaining ring
Screw(M6)
Spacer
Load shaft
Refer to chart below for hollow shaft inside dimensions and the recommended
load shaft dimensions.
Attach the load according to load shaft conditions as shown in either figure
above or below. The hollow shaft inside dimension is processed to a
tolerance of H8, and incorporates a key slot for load shaft attachment. A load
shaft tolerance of h7 is recommended. Apply a lubricant such as
molybdenum disulphide grease etc. to the load shaft and to the inner
circumference of the hollow shaft.
Hollow shaft inside dimensions and recommended load shaft dimensions
[Unit: mm (inch)]
Gearhead Model
BH6G2-
RH
Hollow shaft inside dimensions (H8)
Ø25
+0.033
0
(
.9855DIA.
.9843DIA.
)
Recommended load shaft dimensions (h7)
Ø25
0
−0.021
(
.9843DIA.
.9834DIA.
)
After attaching the load, attach the safety cover.
Note
・
Do not apply excessive force when inserting the load shaft into the
gearhead. Excessive or abrupt force may damage the gearhead
internal bearings.
• When the hollow-shaft gearhead or solid-shaft gearhead with a low
gear ratio (5, 6, 7.5, or 9) is combined with a single-phase motor,
noise (resonasce sound) may occur during operation under no or
light load. This noise can be reduced by adding a frictional load.
3. 4 Disassembling the motor and gearhead (For only combination types)
Motor-gearhead assembly screws
(2-M4 hexagonal socket-head screws)
∗
Illustration shows parallel shaft type.
In combination types, motor and gearhead are attached by means of
motor-gearhead assembly screws (hexagonal sockethead screws).
These screws must be removed in order to replace the gearhead.
Once the gearhead has been replaced, reassemble the unit using the screws
included with the gearhead for this purpose.
To install the unit in machinery, use the mounting screws, and follow the
instructions given in section
. The screw tightening torque for
assembling motor and gearhead is shown in the below chart.
Motor model
Screw size
∗
Tightening torque
BH6G2-
M4
1.0N·m (8.8lb-in)
BH6G2-
RH
,
BH6G2-
RA
M8
10N·m (88lb-in)
∗
The number of screws is two for
BH6G2-
and four with other models.
