Chapter 5
Installation
29
When no straight shaft key is provided
For the wedge-type frictional coupling
The following is an example when fixing the input gear to the motor shaft using a wedge-type frictional
coupling.
Perform steps 1 to 5 by taking care regarding the following precautions.
• Avoid impact to the motor shaft when attaching the input gear.
• Check that there is no foreign matter adhering to the mounting surface.
• When attaching the wedge-type frictional coupling, apply the lubricant onto it.
• For the lubricant, use the one that does not contain molybdenum antifriction agent.
Avoid impact to the motor shaft when attaching the input gear, as it could damage the motor.
If there is foreign matter adhering to the mounting surface, appropriate installation accuracy cannot
be obtained. It could cause deterioration of performance, such as abnormal noise and vibration, and
also lead to damage of the motor.
The transmission torque of the wedge-type frictional coupling varies depending on the motor shaft
diameter. Due to this, the momentary maximum allowable torque or allowable
acceleration/deceleration torque may not be ensured.
Step 1
• Assemble the wedge-type frictional coupling into the input gear as shown in Fig. 5-15.
Step 2
• Assemble the plate into the input gear, and then temporarily secure it with the hexagon socket head
cap screws.
Step 3
• Press the hole base of the input gear onto the edge of the motor shaft completely. (During assembly,
the input gear should slide slightly.)
Step 4
• Tighten the hexagon socket head cap screws in a diagonal order with the specified tightening
torque. After tightening, check that the gap X is equal at each point along the circumference.
(Reference: Table 5-1 in “5.1 Bolt tightening torque”)
• Check dimensions C to see if the input gear has been assembled as in the specified dimensions. For
dimensions C, refer to “Outer dimensions” drawing.
If the hexagon socket head cap screws are not tightened with the specified torque, the reduction
gear does not deliver the designed performance. In addition, it could cause injury and damage to the
customer’s device and the reduction gear.
Note
