Mitsubishi Electric GM-SHY, Instruction Manual

4.Connection 

4.1 When using it as a solid shaft 

(1)

To properly connect the Geared Motor to the machine, reduce the 

eccentricity between the motor and machine to 0.05mm or less. 

Use the flexible coupling to easily connect the motor to the 

machine. 

(2)

Adjust deflection amount of the chain to 4% of the span(refer to 

Fig.1). If the deflection amount is too large, a great shock may 

be applied at starting, and the geared motor may be damaged by 

the shock. 

(3)

 To prevent damage caused by the overhang load, adjust the 

positions of the sprocket, gear, pulley, etc. so that the loading 

position can be closer to the joint of the output shaft and the gear 

case (refer to Fig. 2). 

(4)

 The tolerance for the holes of the sprocket, coupling, etc. 

should be H8. Smoothly install the sprocket, coupling etc. using 

the tap on the output shaft (refer to Fig. 3).

(5)

  Do not use any hammer for installation. Application of a large 

force may damage the bearing, gear, etc.

4.2 For hollow shaft 

Prepare the parts shown in Fig. 4 to easily connect the motor. We cannot supply any tools necessary for attachment or removal. Please prepare these 

tools by yourself. 

Attach an attached protective cover in an opposite drive side.

（

Insert striking lightly into the slot processed on the case flange face.

）

1.Connection to hollow shaft

Before connection, Please insert it after spreading the printing prevention 

medicine (molybdenum disulfide etc.) on the driven shaft and the inside 

diameter of the hollow shaft when you insert driven shaft 

If the shafts are too tight to be engaged each other, tap the hollow shaft 

(output shaft) with a shock-less hammer. If you use the jigs and tools shown 

in the figure, you can connect the shafts more easily. 

The inner diameer of the hollow shaft is machined while observing the H8 

tolerance grade. For general engagement, the tolerance of h7 is recommended 

for the driven shaft. If a large shock or a large radial load is to be applied to 

the shafts, tightly engage the shafts. 

2.Fixing of hollow shaft 

  (a) If driven shaft has steps 

(b) If driven shaft does not have any steps 

Firmly fix the driven shaft to the hollow 

shaft. 

3.Removal from hollow shaft 

If you manufacture the tools shown in the 

figure, the shaft can be smoothly removed. 

Fig. 4    Hollow shaft and driven shaft 

Spacer

Bearing 

Nut

Bolt 

Spacer

Spacer 

Bolt 

Snap ring 

Snap ring

Bolt 

Snap ring 

Bolt 

Spacer 

Cross section of spacer 

0.04× L or less 

L 

Fig. 1 deflection amount of chain

Fig.2 

Sprocket 

position            Fig. 

3 

Sprocket 

installation 

φd 

3

×

φ

d 

or

 m

or

e 

－ 4 －