Harmonic servo-gearbox FHG-III-17

coaxialhollow-shaft500 - 1000 Nm

Introduction
The FHG-III series harmonic drive is a compact, integrated reducer with a large hollow shaft design. It features a sealed flange assembly pre-filled with specialized grease and an internal high‑rigidity cross‑roller main bearing. Typical configurations include fixed circular spline with flexspline output or fixed flexspline with circular spline output, enabling straightforward mechanical integration.

Features

• Large hollow shaft for cable and optical line routing
• Fully sealed integrated flange, factory pre-filled with specialized lubricating grease
• Input interfaces via timing pulleys or gear shafts
• Excellent rotational and positioning accuracy (backlash ≤ 20 arc sec where specified)
• High torque capacity and rigidity
• Coaxial input and output for compact system design

Starting torque (FHG series, unit: cNm)
Reduction ratios: 11, 14, 17, 20, 25, 32, 40
50: -, 8.8, 27, 36, 56, 85, 136
80: -, 7.5, 25, 33, 50, 74, 117
100: -, 6.9, 24, 32, 49, 72, 112
120: -, 6.9, 24, 31, 48, 68, 110
160: -, -, -, 31, 47, 67, 105

Moment load table (selected values)
FHG-14: Mb nominal 41 Nm; Mb max 80 Nm; Ft nominal 270 N; Ft max 490 N; Fa nominal 270 N; Fa max 490 N
FHG-17: Mb nominal 72 Nm; Mb max 140 Nm; Ft nominal 400 N; Ft max 700 N; Fa nominal 400 N; Fa max 700 N
FHG-20: Mb nominal 140 Nm; Mb max 280 Nm; Ft nominal 650 N; Ft max 1150 N; Fa nominal 650 N; Fa max 1150 N
FHG-25: Mb nominal 243 Nm; Mb max 480 Nm; Ft nominal 900 N; Ft max 1600 N; Fa nominal 900 N; Fa max 1600 N
FHG-32: Mb nominal 460 Nm; Mb max 900 Nm; Ft nominal 1350 N; Ft max 2300 N; Fa nominal 1350 N; Fa max 2300 N
FHG-40: Mb nominal 600 Nm; Mb max 1200 Nm; Ft nominal 2000 N; Ft max 3500 N; Fa nominal 2000 N; Fa max 3500 N

Performance highlights

• Rated torque and permissible peak values depend on model and reduction ratio; consult model tables for exact figures
• Permissible maximum input speed (with grease): model-dependent, values up to 15000 r/min in selected configurations
• Backlash typically ≤ 20 arc sec where specified
• Design life and weight vary by model and reduction; reference detailed tables for selection

Technical specifications (selected)

• Series: FHG-III
• Type: Harmonic drive with large hollow shaft
• Structure: Integrated sealed flange, hollow shaft
• Lubrication: Factory pre-filled with specialized grease
• Main bearing: Integrated high‑rigidity cross‑roller bearing
• Output options: Fixed circular spline with flexspline output or fixed flexspline with circular spline output
• Input connections: Timing pulleys or gear shafts
• Reduction ratios available: examples include 11, 14, 17, 20, 25, 32, 40, 50, 80, 100, 120, 160
• Typical backlash: ≤ 20 arc sec (model-dependent)
• Permissible input speed: typically 4000–15000 r/min depending on model and ratio

Applications and notes
The FHG-III series is suited to precision robotics, actuators and equipment requiring coaxial drive layouts, internal cable routing, and compact integration. For final sizing, consult the detailed model tables for torque, moment loads, permissible speeds and expected weight and lifetime values.