Gearhead

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

Spur gearhead

  1. base-plate
  2. kana (drive sprocket)
  3. guide
  4. spur (driven sprocket)
  5. bearing
  6. output shaft
  • 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

  1. base-plate
  2. planetary gear
  3. career plate
  4. internal gear
  5. bearing
  6. output shaft
  • 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.

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 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 SSG10-15 1 / 15.40 3 12 30 73 14 5.4
SSG10-29 1 / 29.25 4 12 30 66 16 6.2
SSG10-49 1 / 48.75 5 12 30 59 18 7
SSG10-93 1 / 93.43 5 12 30 59 18 7
SSG10-262 1 / 261.60 6 12 30 53 20 7.9
12 SSG12-16 1 / 15.78 3 12 30 73 14 8.3
SSG12-25 1 / 24.70 3 12 30 73 14 8.3
SSG12-47 1 / 47.35 4 15 30 66 16 9.2
SSG12-74 1 / 74.10 4 15 30 66 16 9.2
SSG12-94 1 / 93.86 4 15 30 66 16 9.2
SSG12-176 1 / 175.50 5 15 30 59 18 10.2
SSG12-282 1 / 281.58 5 15 30 59 18 10.2
15 SSG15-29 1 / 29.07 3 15 30 73 9.6 8.9
SSG15-49 1 / 48.58 4 24 60 66 11.6 10.3
SSG15-71 1 / 71.35 4 24 60 66 11.6 10.3
SSG15-94 1 / 93.68 4 24 60 66 11.6 10.3
SSG15-198 1 / 198.06 5 24 60 59 13.6 11.5
SSG10-15
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 15.40
Number of stage
3
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
73
Length[m]
14
Weight[g]
5.4
Rotation direction
SSG10-29
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 29.25
Number of stage
4
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
66
Length[m]
16
Weight[g]
6.2
Rotation direction
SSG10-49
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 48.75
Number of stage
5
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
59
Length[m]
18
Weight[g]
7
Rotation direction
SSG10-93
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 93.43
Number of stage
5
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
59
Length[m]
18
Weight[g]
7
Rotation direction
SSG10-262
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 261.60
Number of stage
6
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
53
Length[m]
20
Weight[g]
7.9
Rotation direction
SSG12-16
Dia.[mm]
12
Reduction Ratio (absolute value)
1 / 15.78
Number of stage
3
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
73
Length[m]
14
Weight[g]
8.3
Rotation direction
SSG12-25
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 24.70
Number of stage
3
Allowable Torque:Continous[mNm]
12
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
73
Length[m]
14
Weight[g]
8.3
Rotation direction
SSG12-47
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 47.35
Number of stage
4
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
66
Length[m]
16
Weight[g]
9.2
Rotation direction
SSG12-74
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 74.10
Number of stage
4
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
66
Length[m]
16
Weight[g]
9.2
Rotation direction
SSG12-94
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 93.86
Number of stage
4
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
66
Length[m]
16
Weight[g]
9.2
Rotation direction
SSG12-176
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 175.50
Number of stage
5
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
59
Length[m]
18
Weight[g]
10.2
Rotation direction
SSG12-282
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 281.58
Number of stage
5
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
59
Length[m]
18
Weight[g]
10.2
Rotation direction
SSG15-29
Dia.[mm]
15
Reduction Ratio (absolute value)
1 / 29.07
Number of stage
3
Allowable Torque:Continous[mNm]
15
Allowable Torque:Intermittent[mNm]
30
Efficiency[%]
73
Length[m]
9.6
Weight[g]
8.9
Rotation direction
SSG15-49
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 48.58
Number of stage
4
Allowable Torque:Continous[mNm]
24
Allowable Torque:Intermittent[mNm]
60
Efficiency[%]
66
Length[m]
11.6
Weight[g]
10.3
Rotation direction
SSG15-71
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 71.35
Number of stage
4
Allowable Torque:Continous[mNm]
24
Allowable Torque:Intermittent[mNm]
60
Efficiency[%]
66
Length[m]
11.6
Weight[g]
10.3
Rotation direction
SSG15-94
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 93.68
Number of stage
4
Allowable Torque:Continous[mNm]
24
Allowable Torque:Intermittent[mNm]
60
Efficiency[%]
66
Length[m]
11.6
Weight[g]
10.3
Rotation direction
SSG15-198
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 198.06
Number of stage
5
Allowable Torque:Continous[mNm]
24
Allowable Torque:Intermittent[mNm]
60
Efficiency[%]
59
Length[m]
13.6
Weight[g]
11.5
Rotation direction

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 SPG07-4.7 1 / 4.71 1 10 20 85 7.4 2.0
SPG07-22 1 / 22.22 2 10 20 72 9.6 2.5
SPG07-105 1 / 104.77 3 10 20 61 11.8 3.0
SPG07-494 1 / 493.93 4 10 20 52 14.1 3.5
10 SPG10-3.6 1 / 3.60 1 50 100 85 10.50 5.8
SPG10-4.70 1 / 4.70 1 50 100 85 10.50 7.1
SPG10-13 1 / 12.96 2 50 100 72 13.50 7.1
SPG10-22 1 / 22.22 2 50 100 72 13.50 8.4
SPG10-61 1 / 61.10 3 50 100 61 16.50 8.4
SPG10-105 1 / 104.77 3 50 100 61 16.50 9.7
SPG10-288 1 / 288.03 4 50 100 52 19.60 9.7
SPG10-493 1 / 493.93 4 50 100 52 19.6 11.6
12 SPG12-3.5 1 / 3.50 1 100 200 85 14.2 11.6
SPG12-4.8 1 / 4.80 1 100 200 85 14.2 14.1
SPG12-12 1 / 12.25 2 100 200 72 18.0 14.1
SPG12-23 1 / 22.56 2 100 200 72 18.0 16.6
SPG12-58 1 / 58.19 3 100 200 61 21.8 16.6
SPG12-107 1 / 107.17 3 100 200 61 21.8 19.1
SPG12-509 1 / 509.07 4 100 200 52 25.7 20
16 SPG16-3.6 1 / 3.60 1 200 400 85 15.3 20
SPG16-4.7 1 / 4.71 1 200 400 85 15.3 24.5
SPG16-13 1 / 12.96 2 200 400 72 19.5 24.5
SPG16-22 1 / 22.22 2 200 400 72 19.5 29
SPG16-61 1 / 61.10 3 200 400 61 23.7 29
SPG16-105 1 / 104.7 3 200 400 61 23.7 16.4
SPG07-4.7
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 4.71
Number of stage
1
Allowable Torque:Continous[mNm]
10
Allowable Torque:Intermittent[mNm]
20
Efficiency[%]
85
Length[m]
7.4
Weight[g]
2.0
Rotation direction
SPG07-22
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 22.22
Number of stage
2
Allowable Torque:Continous[mNm]
10
Allowable Torque:Intermittent[mNm]
20
Efficiency[%]
72
Length[m]
9.6
Weight[g]
2.5
Rotation direction
SPG07-105
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 104.77
Number of stage
3
Allowable Torque:Continous[mNm]
10
Allowable Torque:Intermittent[mNm]
20
Efficiency[%]
61
Length[m]
11.8
Weight[g]
3.0
Rotation direction
SPG07-494
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 493.93
Number of stage
4
Allowable Torque:Continous[mNm]
10
Allowable Torque:Intermittent[mNm]
20
Efficiency[%]
52
Length[m]
14.1
Weight[g]
3.5
Rotation direction
SPG10-3.6
Dia.[mm]
10
Reduction Ratio (absolute value)
1 / 3.60
Number of stage
1
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
85
Length[m]
10.50
Weight[g]
5.8
Rotation direction
SPG10-4.70
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 4.70
Number of stage
1
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
85
Length[m]
10.50
Weight[g]
7.1
Rotation direction
SPG10-13
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 12.96
Number of stage
2
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
72
Length[m]
13.50
Weight[g]
7.1
Rotation direction
SPG10-22
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 22.22
Number of stage
2
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
72
Length[m]
13.50
Weight[g]
8.4
Rotation direction
SPG10-61
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 61.10
Number of stage
3
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
61
Length[m]
16.50
Weight[g]
8.4
Rotation direction
SPG10-105
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 104.77
Number of stage
3
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
61
Length[m]
16.50
Weight[g]
9.7
Rotation direction
SPG10-288
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 288.03
Number of stage
4
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
52
Length[m]
19.60
Weight[g]
9.7
Rotation direction
SPG10-493
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 493.93
Number of stage
4
Allowable Torque:Continous[mNm]
50
Allowable Torque:Intermittent[mNm]
100
Efficiency[%]
52
Length[m]
19.6
Weight[g]
11.6
Rotation direction
SPG12-3.5
Dia.[mm]
12
Reduction Ratio (absolute value)
1 / 3.50
Number of stage
1
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
85
Length[m]
14.2
Weight[g]
11.6
Rotation direction
SPG12-4.8
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 4.80
Number of stage
1
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
85
Length[m]
14.2
Weight[g]
14.1
Rotation direction
SPG12-12
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 12.25
Number of stage
2
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
72
Length[m]
18.0
Weight[g]
14.1
Rotation direction
SPG12-23
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 22.56
Number of stage
2
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
72
Length[m]
18.0
Weight[g]
16.6
Rotation direction
SPG12-58
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 58.19
Number of stage
3
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
61
Length[m]
21.8
Weight[g]
16.6
Rotation direction
SPG12-107
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 107.17
Number of stage
3
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
61
Length[m]
21.8
Weight[g]
19.1
Rotation direction
SPG12-509
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 509.07
Number of stage
4
Allowable Torque:Continous[mNm]
100
Allowable Torque:Intermittent[mNm]
200
Efficiency[%]
52
Length[m]
25.7
Weight[g]
20
Rotation direction
SPG16-3.6
Dia.[mm]
16
Reduction Ratio (absolute value)
1 / 3.60
Number of stage
1
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
85
Length[m]
15.3
Weight[g]
20
Rotation direction
SPG16-4.7
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 4.71
Number of stage
1
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
85
Length[m]
15.3
Weight[g]
24.5
Rotation direction
SPG16-13
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 12.96
Number of stage
2
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
72
Length[m]
19.5
Weight[g]
24.5
Rotation direction
SPG16-22
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 22.22
Number of stage
2
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
72
Length[m]
19.5
Weight[g]
29
Rotation direction
SPG16-61
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 61.10
Number of stage
3
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
61
Length[m]
23.7
Weight[g]
29
Rotation direction
SPG16-105
Dia.[mm]
7
Reduction Ratio (absolute value)
1 / 104.7
Number of stage
3
Allowable Torque:Continous[mNm]
200
Allowable Torque:Intermittent[mNm]
400
Efficiency[%]
61
Length[m]
23.7
Weight[g]
16.4
Rotation direction
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