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14. SERVO MOTOR
14.6.4 Servo motors with special shafts
The standard shaft of the servo motor is straight without a keyway. Shafts with keyway and D cut are
also available. Except for the servo motor with reduction gear.
These shafts are not appropriate for applications where the servo motor is started and stopped frequently.
Use a friction coupling or the like with such keys since we cannot guarantee such trouble as broken shafts
due to loose keys.
Shaft Shape
Servo Motor
Keyway D cut Straight
HC-SFE52 to 202
(Note 2)
(Note 3)
HC-KFE13
(Note 3)
HC-KFE23 to 73
(Note 1)
(Note 3)
Note: 1. With a key.
2. Without a key.
3. This is a standard. For shape, refer to Section 14.9.
(1) Keyway
(a) With key
R
Q
QL
QK
A
A
HC-MF23K to 73K
R
HC-UF23K to 73K
QL
QK
A
A
Q
H
W
U
S
Y
Section A-A
[Unit: mm]
([Unit: in])
Variable Dimensions
Servo Motor Model
S R Q W QK QL U H Y
HC-KFE23K 43K
14h6
(14)
30
(1.18)
27
(1.06)
5
(0.20)
20
(0.79)
3
(0.12)
3
(0.12)
5
(0.20)
M4 Depth 15
(0.59)
HC-KFE73K
19h6
(19)
40
(1.57)
37
(1.46)
6
(0.24)
25
(0.98)
5
(0.20)
3.5
(0.14)
6
(0.24)
M5 Depth 20
(0.79)
(b) Without key
[Unit: mm]
([Unit: in])
Variable Dimensions
Servo motor
S R Q W QK QL U r
HC-SFE52K to 152K
24h6
(0.94)
55
(2.17)
50
(1.97)
8
0
0.036
(0.31)
36
(1.42)
5
(0.20)
4
0.2
0
(0.16)
4
(0.16)
HC-SFE202K
35
(1.38)
79
(3.11)
-
10
0
0.036
(0.39)
55
(2.17)
5
(0.20)
5
0.2
0
(0.20)
5
(0.20)
R
Q
QLQK
S
U
A
A
r
W
Section A-A
M8 threads
Depth 20(0.79
)
14.6.5 D cut
[Unit: mm]
([Unit: in])
Variable Dimensions
Servo Motor Model
RQKS
HC-KFE053D 13D 25(0.98) 20.5(0.81) 8h(0.32)
R
S
QK
1(0.039)