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Gearhead

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   Namiki's high efficiency/low noise gear was made possible by the company’s high
   precision processing technology nurtured in watch parts making.

By attaching a reduction gear mechanism on the motor output shaft, it can generate high torque/low speed, which motor alone cannot achieve.
Compact motors usually feature high speed, but this speed can be reduced to requested level by combining with a gear head.
Because torque increases in proportion to gear ratio, high torque can be easily achieved even in a compact motor.
While a gear head can help generate high torque, it may influence durability and characteristics failure depending on its accuracy.
Using the precision processing technology nurtured in diamond processing/watch part processing, Namiki manufactures and delivers low noise, high efficiency precision gear heads.

Spur reduction gear
① base-plate
② kana (drive sprocket)
③ guide
④ spur (driven sprocket)
⑤ bearing
⑥ output shaft
 
Spur gear structure
 
Planetary reduction gear
① base-plate
② planetary gear
③ career plate
④ internal gear
⑤ bearing
⑥ output shaft

 
Planetary gear structure
 

Spur gearhead

  -  Most popular gearhead

  -  Gear shaft is aligned in parallel with the output shaft

  -  No thrust force is generated

  -  Rotating direction may differ between input shaft and
      output shaft depending on the stages.

 

Spur gear: Gear train using spur wheel, relatively simple structured with fewer number of parts, advantage is less mechanical noise.
 

Planetary gearhead

  -  Large reduction ratio can be achieved

  -  Considerable torque transmission

  -  Input shaft (motor shaft) and output shaft (gear shaft)
      are aligned in one straight line.

  -  Torque is distributed evenly to each planetary gear,
      so the gear is relatively strong in durability.

 

Planetary gear: It is called a planetary gear because it orbits around the sun gear. Due to large number of teeth, it is suited for high torque transfer.

 

* Gear head is sellable only in combination with motor.

 

Spur Gear

Dia.
[mm]
Products
Reduction
Ratio
(absolute
value)
Number
of stage
Allowable Torque
Efficiency
[%]
Length
[m]
Weight
[g]
Rotation
direction
Continous
[mNm]
Intermittent
[mNm]
10
1 / 15.40
3
12
30
73
14
5.4
1 / 29.25
4
12
30
66
16
6.2
1 / 48.75
5
12
30
59
18
7
1 / 93.43
5
12
30
59
18
7
1 / 261.60
6
12
30
53
20
7.9
12
1 / 15.78
3
12
30
73
14
8.3
1 / 24.70
3
12
30
73
14
8.3
1 / 47.35
4
15
30
66
16
9.2
1 / 74.10
4
15
30
66
16
9.2
1 / 93.86
4
15
30
66
16
9.2
1 / 175.50
5
15
30
59
18
10.2
1 / 281.58
5
15
30
59
18
10.2
15
1 / 29.07
3
15
30
73
9.6
8.9
1 / 48.58
4
24
60
66
11.6
10.3
1 / 71.35
4
24
60
66
11.6
10.3
1 / 93.68
4
24
60
66
11.6
10.3
1 / 198.06
5
24
60
59
13.6
11.5

 

Planetary Gear

Dia.
[mm]
Products
Reduction
Ratio
(absolute
value)
Number
of stage
Allowable Torque
Efficiency
[%]
Length
[m]
Weight
[g]
Rotation
direction
Continous
[mNm]
Intermittent
[mNm]
7
1 / 4.71
1
10
20
85
7.4
2.0
1 / 22.22
2
10
20
72
9.6
2.5
1 / 104.77
3
10
20
61
11.8
3.0
1 / 493.93
4
10
20
52
14.1
3.5
10
1 / 3.60
1
50
100
85
10.50
5.8
1 / 4.70
1
50
100
85
10.50
7.1
1 / 12.96
2
50
100
72
13.50
7.1
1 / 22.22
2
50
100
72
13.50
8.4
1 / 61.10
3
50
100
61
16.50
8.4
1 / 104.77
3
50
100
61
16.50
9.7
1 / 288.03
4
50
100
52
19.60
9.7
1 / 493.93
4
50
100
52
19.6
11.6
12
1 / 3.50
1
100
200
85
14.2
11.6
1 / 4.80
1
100
200
85
14.2
14.1
1 / 12.25
2
100
200
72
18.0
14.1
1 / 22.56
2
100
200
72
18.0
16.6
1 / 58.19
3
100
200
61
21.8
16.6
1 / 107.17
3
100
200
61
21.8
19.1
1 / 509.07
4
100
200
52
25.7
20
16
1 / 3.60
1
200
400
85
15.3
20
1 / 4.71
1
200
400
85
15.3
24.5
1 / 12.96
2
200
400
72
19.5
24.5
1 / 22.22
2
200
400
72
19.5
29
1 / 61.10
3
200
400
61
23.7
29
1 / 104.77
3
200
400
61
23.7
16.4
 
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