Type 121 (20G) (Clutch/Brake)

三木プーリのクラッチ・ブレーキユニット 121[20G]タイプ 製品画像（電磁クラッチブレーキ一体型・高応答制御・産業用駆動機器）
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This is an open-type electromagnetic clutch and brake unit in which the electromagnetic clutch and brake are mounted on the outer surface of a light alloy drum via a through-shaft structure. Power is supplied from the input hub and is constantly transmitted through the output shaft; braking of the output shaft is achieved by energizing the brake when the clutch is disengaged. The design is highly resistant to radial loads.

[Specifications]

Model Size Dynamic friction torque Td [N·m] Static friction torque Ts [N·m] Coil (at 20°C) Temperature Class Maximum rotational speed [min⁻¹] Rotating mass moment of inertia J [kg·m²] Total work until air gap readjustment ET [J] Armature attraction time ta [s] Torque rise time tp [s] Torque decay time td [s] Mass [kg]
Voltage [V] Power [W] Current [A] Resistance [Ω]
121-06-20G 06 5 5.5 DC24 11 0.46 52 B 3000 1.43×10⁻⁴ 36×10⁶ C: 0.020 / B: 0.015 C: 0.041 / B: 0.033 C: 0.020 / B: 0.015 1.5
121-08-20G 08 10 11 DC24 15 0.63 38 B 3000 4.23×10⁻⁴ 60×10⁶ C: 0.023 / B: 0.016 C: 0.051 / B: 0.042 C:0.030 / B:0.025 2.7
121-10-20G 10 20 22 DC24 20 0.83 29 B 3000 1.42×10⁻³ 130×10⁶ C: 0.025 / B: 0.018 C: 0.063 / B: 0.056 C:0.050 / B:0.030 5.5
121-12-20G 12 40 45 DC24 25 1.04 23 B 3000 4.18×10⁻³ 250×10⁶ C: 0.040 / B: 0.027 C: 0.115 / B: 0.090 C:0.065 / B:0.050 9.6
121-16-20G 16 80 90 DC24 35 1.46 16 B 3000 1.34×10⁻² 470×10⁶ C: 0.050 / B: 0.035 C: 0.160 / B: 0.127 C:0.085 / B:0.055 18.5
121-20-20G 20 160 175 DC24 45 1.88 13 B 2500 4.13×10⁻² 10×10⁸ C: 0.090 / B: 0.065 C: 0.250 / B: 0.200 C:0.130 / B:0.070 35
121-25-20G 25 320 350 DC24 60 2.50 9.6 B 2000 1.02×10⁻¹ 20×10⁸ C: 0.115 / B: 0.085 C:0.335 / B:0.275 C:0.210 / B:0.125 64
  • The dynamic friction torque Td is the value at a relative speed of 100 min⁻¹. Additionally, depending on the initial torque characteristics, a break-in period may be required.

[Dimensions]

三木プーリのクラッチ・ブレーキユニット121モデル20Gタイプ寸法図 外形寸法および取付寸法を示す寸法図
Unit [mm]
Size Unit Dimensions Shaft Dimensions
A1 A2 B1 B2 C D E F G H J1 J2 K L M N Z1 Z2 Q1 Q2 S1 S2 U1 U2 V1 V2 X1 X2 W1,2
6 52.5 75 80 90 55 80 27.5 53 2.6 95 65.5 40.5 105.5 181 47 33 13.5 6.5 25 20 11 38 12.5 39.5 M4×0.7, depth 8 3-M4×0.7 depth 4 3-120° 60° 4
8 65 90 90 105 65 100 27.5 61 2.6 115 78.5 48.5 126.5 217 57 37 13.5 6.5 30 25 14 45 16 47 M4×0.7, depth 8 3-M4×0.7 depth 6 3-120° 60° 5
10 80 110 110 130 80 125 32.5 72 3.2 142.5 98 62 154 270 72 47 15.5 9 40 30 19 55 21 57 M6×1, depth 11 4-M4×0.7, depth 8 4-90° 45° 5
12 105 135 140 160 90 150 35 81 3.2 165 121 73.5 184 330 92 52 20 11.5 50 40 24 64 27 67 M6×1, depth 11 4-M4×0.7 depth 8 4-90° 45° 7
16 135 160 175 185 112 190 43 97 4.5 207 149 90 221 399 113 62 24.5 11.5 60 50 28 75 31 78 M6×1, depth 11 6-M5×0.8 depth 8 6-60° 30° 7
20 155 200 200 230 132 230 45 109 6 247 187 117 276 504 142 74.5 28 14 80 60 38 90 41.5 93.5 M10×1.5, depth 17 4-M6×1, depth 12 4-90° 45° 10
25 195 240 240 270 160 290 47.5 124 20 305 238 154 334 632 183 101.5 28 14 110 70 42 115 45.5 118.5 M10×1.5, depth 17 8-M6×1, depth 12 8-45° 22.5° 12
  • The keyways on the input and output shafts comply with the old JIS Type 2 standard, while the keys comply with the old JIS Type 1 standard. Please note that the keyway dimensions for the unit hub section do not comply with JIS standards. Please refer to the dimension table above.
  • When installing pulleys or similar components on the input or output shafts, please use the included installation kit.
  • The base of the 121-25-20G is made of cast metal.
三木プーリの121モデル 20Gタイプ クラッチブレーキユニット ご注文時の型式構成説明図