Appendix: Design Scheme of Input Gear
72
<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 keyway 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 69 and 70.
4. Design the motor shaft hole diameter (d1) according to the motor shaft diameter to be used.
5. For the keyway width (k) and keyway height (a), refer to the specifications of the key to be used.
6. Design the diameter of the recessed groove for the keyway (d2) according to the following instructions.
• Recessed groove diameter for keyway
Set the diameter of the recessed groove (d2) so that it is larger than
the corner of the keyway.
Although the following calculation formula is used in this example,
design the diameter using appropriate values, based on the keyway
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 examples of recessed groove diameter (d2)
(Unit: mm)
(Unit: mm)
Motor shaft
hole diameter
ød1
Keyway
width
k
Keyway
height
a
Recessed
groove
diameter
ød2
Motor shaft
hole diameter
ød1
Keyway
width
k
Keyway
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
Image of assembly
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
≧
Plunge grinding
range
Tapped hole for set screw
Drill both at
the same time
Clearance
Installation reference
surface
(Recessed groove diameter)
Содержание RV E Series
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