Planetary Reducer

Planetary Reducer
Planetary Reducer
Planetary Reducer
Planetary Reducer
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A precision planetary reducer is a high-accuracy, high-efficiency reduction device, with its core transmission structure comprising planetary gears, a sun gear, and an internal ring gear. Its primary functions are to reduce rotational speed, increase torque, and decrease the rotational inertia ratio of the load motor. These reducers are commonly installed on stepping motors and servo motors.

The planetary reducer represents an extension of Kean's gear technology into complete drive systems. Kean proudly introduces the KS140/180 planetary reducer, engineered with high-quality alloy steel (HRC57-60) and a helical gear design. The KS140/180 delivers high torque, low backlash, and smooth operation, all within a compact, easy-to-maintain unit. Leveraging Kean's 23 years of high-precision gear machining capabilities and experience, along with over 30 patents and advanced Gleason and ZEISS equipment, Kean ensures outstanding performance. Please refer to the parameter tables and dimension drawings below for detailed specifications!

Product Types
KS140 Planetary Reducer
Ratios i / 3 4 5 7 8 10
Nominal output torque T2N Nm 200 330 330 320 310 330
Emergency stop torque ② T2Not Nm 1250 1320 1320 1320 1250 1250
Max. acceleration torque ③ T2B Nm 460 790 790 790 640 640
Nominal input speed n1N rpm 2100 2100 2100 2600 2600 2600
Max. input speed nIMAX rpm 5000 5000 5000 5000 5000 5000
Max. backlash / arcmin ≤3
Torsional stiffness / Nm/arcmin 50
Max. axial force ④ F2AMax N 9700
Max. radial force ④ F2AMax N 9750
Efficiency η % 97
Life time / h >20000
Weight / kg 17.5
Noise emission / dB ≤65
Operation temperature / 90
Ambient temperature / -15 to 40
Lubrication / / Lifetime lubrication
Rotation direction / / Same rotation direction for input and output axes
Degree of gearbox protection / / IP65
Mass moment of inertia (input) J1 38 kgcm² 15 12.15 11.00 10.20 9.50 9.50
Technical Notes
  • ①: Dimensions depend on the motor; please contact us for details. D1 standard sizes: Ø38 (for KS140).
  • ②: Life cycle rating: ≤1000 times.
  • ③: Per hour rating: ≤1000 times.
  • ④: At an output speed of 100rpm, applied at the center position of the output shaft.
KS180 Planetary Reducer
Ratios i / 3 4 5 7 8 10
Nominal output torque T2N Nm 510 920 920 825 825 860
Emergency stop torque ② T2Not Nm 2750 2750 2750 2750 2750 2750
Max. acceleration torque ③ T2B Nm 1160 1450 1450 1450 1165 1165
Nominal input speed nIN rpm 1500 1500 1500 2300 2300 2300
Max. input speed nIMax rpm 4500 4500 4500 4500 4500 4500
Max. backlash / arcmin ≤3
Torsional stiffness / Nm/arcmin 165
Max. axial force ④ F2AMax N 13950
Max. radial force ④ F2QMax N 15200
Efficiency η % 97
Life time / h >20000
Weight / Kg 34
Noise emission / dB ≤65
Operation temperature / 90
Ambient temperature / -15 to 40
Lubrication / / Lifetime lubrication
Rotation direction / / Same rotation direction for input and output axes
Degree of gearbox protection / / IP65
Mass moment of inertia (input) J1 48 Kg/cm² 58.30 41.30 35.50 29.80 29.70 26.60
J1 55 66.00 50.00 44.10 38.70 38.70 35.60
Technical Notes
  • ①: Dimensions depend on the motor; please contact us for details. D1 standard sizes: Ø48/Ø55 (for KS180).
  • ②: Life cycle rating: ≤1000 times.
  • ③: Per hour rating: ≤1000 times.
  • ④: At an output speed of 100rpm, applied at the center position of the output shaft.
Precision Gear Design & Manufacturing
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