Appendix: Design Scheme of Input Gear
48
<Design example 2: For straight shafts (attached to motor shaft base)>
Note
1. When a tapped hole is not used for the motor shaft, fix the input gear to the motor shaft with a set screw.
2. If a clearance hole for the key slot cannot be drilled due to some reason, such as the plunge grinding area being located
on the outer periphery, create a recessed groove instead.
3. For the radial runout and the shaft hole position (LC), refer to “Dimensions after modification” in the “Dimensions”
table on pages 48 and 49.
4. Design the motor shaft hole diameter (d1) according to the motor shaft diameter to be used.
5. For the key slot width (k) and key slot height (a), refer to the specifications of the key to be used.
6. Design the diameter of the recessed groove for the key slot (d2) according to the following instructions.
• Recessed groove diameter for key slot
Set the diameter of the recessed groove (d2) so that it is larger than
the corner of the key slot.
Although the above calculation formula is used in this example,
design the diameter using appropriate values, based on the key groove
tolerance, processing tolerance, etc. The following is an example of
when the diameter of the recessed groove is selected based on the
above calculation formula. Use it as a reference when designing
Selection example of recessed groove diameter (d2)
(Unit: mm)
(Unit: mm)
Motor shaft
hole diameter
ød1
Key slot
width
k
Key slot
height
a
Recessed
groove
diameter
ød2
Motor shaft
hole diameter
ød1
Key slot
width
k
Key slot
height
a
Recessed
groove
diameter
ød2
8
3
9.4
12
22
8
25.3
31
9
3
10.4
13
24
8
27.3
33
10
4
11.8
15
25
8
28.3
34
11
4
12.8
16
28
8
31.3
37
14
5
16.3
20
32
10
35.3
41
15
5
17.3
21
35
10
38.3
44
16
5
18.3
22
38
10
41.3
47
17
6
19.8
24
38
12
41.3
47
19
6
21.8
26
42
12
45.3
51
2
2
2
2
1
k
d
a
5
.
0
2
2
1
2
2
2
2
k
d
a
d
≧
5
.
0
2
2
1
2
2
2
2
k
d
a
d
≧
Image of assembly
(Plunge grinding range)
Tapped hole for set screw
Drill both at
the same time
Installation
reference surface
Clearance
(Recessed groove diameter)
