Harmonic servo-gearbox FHG-III-25

coaxialhollow-shaft1000 - 5000 Nm

Introduction
The FHG-III harmonic drive series features a large hollow‑shaft design with an integrated sealed flange. Units are delivered pre‑filled with specialized lubricating grease and incorporate an internal high‑rigidity cross‑roller main bearing. Output configurations are typically fixed circular spline with flexspline output or fixed flexspline with circular spline output.

Key features

• Large hollow shaft enabling cable and optical line routing
• Integrated sealed flange, pre‑filled with specialized grease to simplify assembly
• Input via timing pulleys or gear shafts; coaxial input/output
• Excellent rotational and positioning accuracy; typical backlash ≤20 arc‑sec depending on model and ratio
• High torque capacity and high rigidity
• Available reduction ratios: 11, 14, 17, 20, 25, 32, 40

Performance & torque summary

• Models: FHG-14, FHG-17, FHG-20, FHG-25, FHG-32, FHG-40. Design bending moments (Mbdi) range approximately from 41 Nm (FHG-14) to 600 Nm (FHG-40); Mb max up to ≈1200 Nm
• Rated torque examples at 2000 r/min input vary by model and ratio: FHG-14 ≈7–10 Nm; FHG-17 ≈21–31 Nm; FHG-20 ≈33–52 Nm; FHG-25 ≈51–87 Nm; FHG-32 ≈99–178 Nm; FHG-40 ≈178–382 Nm
• Permissible input speeds (grease) and peak/start torques are model/ratio dependent (typ. ranges 4000–15000 r/min per specification tables)

Technical specifications

• Series: FHG-III (models FHG-14 to FHG-40)
• Structure: large hollow shaft for cable/optical routing; coaxial input/output; integrated sealed flange
• Bearing: internal high‑rigidity cross‑roller main bearing
• Inputs: timing pulleys or gear shafts
• Backlash: typically ≤20 arc‑sec (depends on model/ratio)
• Parameters available per model/ratio: rated torque, peak torque, permissible average torque, radial/axial loads (Ft, Fa), permissible input speed, weight, design life

Applications & installation
Designed for industrial applications requiring compact coaxial power transmission with space for cable or fiber routing through the hollow shaft. Pre‑greased sealed units reduce assembly time; install following manufacturer limits for input speed, torque and radial/axial loads and respect mounting and lubrication instructions.

Selection & ordering
Specify exact model (e.g. FHG-20), reduction ratio and operating conditions (input speed, torque, radial/axial loads) for correct selection. Refer to the detailed specification tables for exact values or contact technical support for drawings and application guidance.