The three-layer construction of the metal coil spring component enables high torque transmission to be achieved in a compact form factor.A type that uses SUM24L-equivalent material as the hub material and piano wire for the coil spring (the MM-K type) and a type that uses stainless steel for the hub and coil spring to boost corrosion resistance (the MM-K-S type) are available. Select the type suited to your usage environment.
Structure and Materials
[Specifications]
| Model | Torque | Misalignment | Max. rotation speed ［min-1］ | Torsional stiffness ［N・m/rad］ | Moment of inertia ［kg・m2］ | Mass ［kg］ | |||
|---|---|---|---|---|---|---|---|---|---|
| Nominal ［N・m］ | Max. ［N・m］ | Parallel ［mm］ | Angular ［°］ | Axial ［mm］ | |||||
| MM-6K | 2.5 | 5 | 0.3 | 3 | ＋0.6 | 20000 | 143 | 7.65×10-7 | 0.03 |
| MM-8K | 5 | 10 | 0.3 | 3 | ＋0.8 | 15000 | 286.5 | 4.08×10-6 | 0.07 |
| MM-12K | 10 | 20 | 0.4 | 3 | ＋1.0 | 12000 | 573 | 1.43×10-5 | 0.14 |
| MM-14K | 10 | 20 | 0.5 | 3 | ＋1.0 | 10000 | 573 | 2.47×10-5 | 0.15 |
| MM-16K | 20 | 40 | 0.6 | 3 | ＋1.2 | 9000 | 1146 | 6.12×10-5 | 0.30 |
| MM-19K | 20 | 40 | 0.7 | 3 | ＋1.2 | 8000 | 1146 | 8.42×10-5 | 0.32 |
| MM-20K | 40 | 80 | 0.7 | 3 | ＋1.6 | 7000 | 2292 | 1.99×10-4 | 0.70 |
| MM-24K | 40 | 80 | 0.9 | 3 | ＋1.6 | 7000 | 2292 | 2.63×10-4 | 0.75 |
| MM-25K | 90 | 180 | 0.9 | 3 | ＋2.0 | 6000 | 3438 | 5.66×10-4 | 1.25 |
| MM-28K | 90 | 180 | 1.0 | 3 | ＋2.0 | 6000 | 2865 | 5.77×10-4 | 1.35 |
| MM-30K | 150 | 300 | 1.1 | 3 | ＋2.5 | 5000 | 4297.5 | 1.39×10-4 | 2.10 |
| MM-35K | 220 | 440 | 1.2 | 3 | ＋3.2 | 4500 | 6303 | 3.01×10-4 | 3.50 |
| Model | Torque | Misalignment | Max. rotation speed ［min-1］ | Torsional stiffness ［N・m/rad］ | Moment of inertia ［kg・m2］ | Mass ［kg］ | |||
|---|---|---|---|---|---|---|---|---|---|
| Nominal ［N・m］ | Max. ［N・m］ | Parallel ［mm］ | Angular ［°］ | Axial ［mm］ | |||||
| MM-6K-S | 2.5 | 5 | 0.3 | 3 | ＋0.6 | 20000 | 143 | 7.65×10-7 | 0.03 |
| MM-8K-S | 5 | 10 | 0.3 | 3 | ＋0.8 | 15000 | 286.5 | 4.08×10-6 | 0.07 |
| MM-12K-S | 10 | 20 | 0.4 | 3 | ＋1.0 | 12000 | 573 | 1.43×10-5 | 0.14 |
| MM-16K-S | 20 | 40 | 0.6 | 3 | ＋1.2 | 9000 | 1146 | 6.12×10-5 | 0.30 |
| MM-20K-S | 40 | 80 | 0.7 | 3 | ＋1.6 | 7000 | 2292 | 1.99×10-4 | 0.70 |
| MM-25K-S | 90 | 180 | 0.9 | 3 | ＋2.0 | 6000 | 3438 | 5.66×10-4 | 1.25 |
*Max. rotation speed does not take into account dynamic balance.
*The moment of inertia and mass are measured for the maximum bore diameter.
[Dimensions]
Unit ［mm］
| Model | d1, d2 | D | L | L1 | E | F | ||
|---|---|---|---|---|---|---|---|---|
| Pilot bore | Min. | Max. | ||||||
| MM-6K | 2.5 | 3 | 8 | 16 | 20 | 6 | 11 | 15.5 |
| MM-8K | 3.5 | 4 | 8 | 21 | 35 | 11 | 13 | 19 |
| MM-12K | 5.5 | 6 | 12 | 26 | 50 | 16.5 | 16.5 | 24 |
| MM-14K | 5.5 | 7 | 14 | 30 | 50 | 16.5 | 20.5 | 28 |
| MM-16K | 5.5 | 10 | 16 | 35 | 65 | 22 | 22.4 | 32 |
| MM-19K | 5.5 | 10 | 19 | 38 | 65 | 22 | 26.4 | 36 |
| MM-20K | 5.5 | 10 | 20 | 45 | 80 | 27 | 28 | 40 |
| MM-24K | 5.5 | 14 | 24 | 48 | 80 | 27 | 33 | 45 |
| MM-25K | 5.5 | 14 | 25 | 55 | 100 | 33.5 | 35 | 50 |
| MM-28K | 5.5 | 14 | 28 | 55 | 100 | 33.5 | 37 | 52 |
| MM-30K | 5.5 | 16 | 30 | 65 | 125 | 40 | 40.8 | 60 |
| MM-35K | 5.5 | 20 | 35 | 75 | 150 | 48 | 46 | 70 |
Unit ［mm］
| Model | d1, d2 | D | L | L1 | E | F | ||
|---|---|---|---|---|---|---|---|---|
| Pilot bore | Min. | Max. | ||||||
| MM-6K-S | 2.5 | 3 | 8 | 17 | 25 | 9 | 11 | 15.5 |
| MM-8K-S | 3.5 | 4 | 8 | 21 | 35 | 11 | 13 | 19 |
| MM-12K-S | 5.5 | 6 | 12 | 26 | 50 | 16.5 | 16.5 | 24 |
| MM-16K-S | 5.5 | 10 | 16 | 35 | 65 | 22 | 22.4 | 32 |
| MM-20K-S | 5.5 | 10 | 20 | 45 | 80 | 27 | 28 | 40 |
| MM-25K-S | 5.5 | 14 | 25 | 55 | 100 | 32.5 | 35 | 50 |
*Pilot bores are to be drilled into the part.
[Standard Hole-drilling Standards]
Unit ［mm］
| Models compliant with the old JIS standards (Class 2) | Models compliant with the new JIS standards | Models compliant with the new motor standards | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal bore diameter | Bore diameter (d1, d2) | Keyway width (W1, W2) | Keyway height (T1, T2) | Set screw hole (M) | Nominal bore diameter | Bore diameter (d1, d2) | Keyway width (W1, W2) | Keyway height (T1, T2) | Set screw hole (M) | Nominal bore diameter | Bore diameter (d1, d2) | Keyway width (W1, W2) | Keyway height (T1, T2) | Set screw hole (M) |
| Tolerance | H7, H8 | E9 | +0.30 | -- | Tolerance | H7 | H9 | +0.30 | -- | Tolerance | G7 | H9 | +0.30 | -- |
| 4 | 4+0.0180 | -- | -- | 2-M3 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 5 | 5+0.0180 | -- | -- | 2-M3 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 6 | 6+0.0180 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 7 | 7+0.0220 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 8 | 8+0.0220 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 9 | 9+0.0220 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 10 | 10+0.0220 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 11 | 11+0.0180 | -- | -- | 2-M4 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 12 | 12+0.0180 | 4+0.050+0.020 | 13.5 | 2-M4 | 12H | 12+0.0180 | 4+0.0300 | 13.8 | 2-M4 | -- | -- | -- | -- | -- |
| 14 | 14+0.0180 | 5+0.050+0.020 | 16.0 | 2-M4 | 14H | 14+0.0180 | 5+0.0300 | 16.3 | 2-M4 | 14N | 14+0.024+0.006 | 5+0.0300 | 16.3 | 2-M4 |
| 15 | 15+0.0180 | 5+0.050+0.020 | 17.0 | 2-M4 | 15H | 15+0.0180 | 5+0.0300 | 17.3 | 2-M4 | -- | -- | -- | -- | -- |
| 16 | 16+0.0180 | 5+0.050+0.020 | 18.0 | 2-M4 | 16H | 16+0.0180 | 5+0.0300 | 18.3 | 2-M4 | -- | -- | -- | -- | -- |
| 17 | 17+0.0180 | 5+0.050+0.020 | 19.0 | 2-M4 | 17H | 17+0.0180 | 5+0.0300 | 19.3 | 2-M4 | -- | -- | -- | -- | -- |
| 18 | 18+0.0180 | 5+0.050+0.020 | 20.0 | 2-M4 | 18H | 18+0.0180 | 6+0.0300 | 20.8 | 2-M5 | -- | -- | -- | -- | -- |
| 19 | 19+0.0210 | 5+0.050+0.020 | 21.0 | 2-M4 | 19H | 19+0.0210 | 6+0.0300 | 21.8 | 2-M5 | 19N | 19+0.028+0.007 | 6+0.0300 | 21.8 | 2-M5 |
| 20 | 20+0.0210 | 5+0.050+0.020 | 22.0 | 2-M4 | 20H | 20+0.0210 | 6+0.0300 | 22.8 | 2-M5 | -- | -- | -- | -- | -- |
| 22 | 22+0.0210 | 7+0.061+0.025 | 25.0 | 2-M6 | 22H | 22+0.0210 | 6+0.0300 | 24.8 | 2-M5 | -- | -- | -- | -- | -- |
| 24 | 24+0.0210 | 7+0.061+0.025 | 27.0 | 2-M6 | 24H | 24+0.0210 | 8+0.0360 | 27.3 | 2-M6 | 24N | 24+0.028+0.007 | 8+0.0360 | 27.3 | 2-M6 |
| 25 | 25+0.0210 | 7+0.061+0.025 | 28.0 | 2-M6 | 25H | 25+0.0210 | 8+0.0360 | 28.3 | 2-M6 | -- | -- | -- | -- | -- |
| 28 | 28+0.0210 | 7+0.061+0.025 | 31.0 | 2-M6 | 28H | 28+0.0210 | 8+0.0360 | 31.3 | 2-M6 | 28N | 28+0.028+0.007 | 8+0.0360 | 31.3 | 2-M6 |
| 30 | 30+0.0210 | 7+0.061+0.025 | 33.0 | 2-M6 | 30H | 30+0.0210 | 8+0.0360 | 33.3 | 2-M6 | -- | -- | -- | -- | -- |
| 32 | 32+0.0250 | 10+0.061+0.025 | 35.5 | 2-M8 | 32H | 32+0.0250 | 10+0.0360 | 35.3 | 2-M8 | -- | -- | -- | -- | -- |
| 35 | 35+0.0250 | 10+0.061+0.025 | 38.5 | 2-M8 | 35H | 35+0.0250 | 10+0.0360 | 38.3 | 2-M8 | -- | -- | -- | -- | -- |
*The ø11 or below requirement under the new JIS standards and ø11 requirement for the new motor standards are the same as the old JIS standards (class 2)
Trịnh
Nguyễn Thanh Thủy
===============================
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