Harmonic servo-gearbox FHG-III-20

coaxialhollow-shaft5 - 10 Nm

Introduction
The FHG-III series harmonic drive is a precision reduction unit featuring a large hollow shaft design and an integrated sealed flange. Components are delivered as a single pre-filled assembly with specialist lubricating grease and an internal high-rigidity cross roller bearing, simplifying machine integration and cabling. Units are available with either fixed circular spline + flexspline output or fixed flexspline + circular spline output.

Features

• Large hollow shaft for routing cables and optical lines through the drive
• Integrated sealed flange, pre-filled with specialized grease for simplified assembly
• Input interface via timing pulleys or gear shafts
• High rotational and positioning accuracy
• High torque capacity and structural rigidity
• Coaxial input and output for compact integration

Starting torque of FHG series (excerpt)
Type / 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 of FHT(FHG) series (excerpt)
Model / Design value / Instant permissible value
FHG-14: Mb di 41 Nm; Mb max 80 Nm; Ft di 270 N; Ft max 490 N; Fa di 270 N; Fa max 490 N
FHG-17: Mb di 72 Nm; Mb max 140 Nm; Ft di 400 N; Ft max 700 N; Fa di 400 N; Fa max 700 N
FHG-20: Mb di 140 Nm; Mb max 280 Nm; Ft di 650 N; Ft max 1150 N; Fa di 650 N; Fa max 1150 N
FHG-25: Mb di 243 Nm; Mb max 480 Nm; Ft di 900 N; Ft max 1600 N; Fa di 900 N; Fa max 1600 N
FHG-32: Mb di 460 Nm; Mb max 900 Nm; Ft di 1350 N; Ft max 2300 N; Fa di 1350 N; Fa max 2300 N
FHG-40: Mb di 600 Nm; Mb max 1200 Nm; Ft di 2000 N; Ft max 3500 N; Fa di 2000 N; Fa max 3500 N

Performance / Rated torque and related values (selected excerpts)
Manufacturer tables provide rated torque (Nm), permissible peak torque at start/stop (Nm), permissible maximum average load torque (Nm), permissible max input speed (rev/min), backlash (Arc Sec) and weight (kg) per model and reduction ratio. Example extracts:
Model 14 (reductions 50/80/100/120): rated torque @2000 r/min input ~7–10 Nm; permissible peak torque ~23–36 Nm; permissible max average torque ~9–14 Nm; permissible max input speed (grease) up to 8500–15000 r/min depending on reduction and variant; Backlash ≤20 Arc Sec.
Models 17, 20, 25, 32, 40: detailed matrices list rated torque, peak torque, permissible average torque, max input speed, backlash, weight and design life per reduction ratio and model size (see product tables).

Applications / Notes
The integrated sealed flange and large hollow bore are suitable where cabling or optical routing through the drive is required. Configurable output arrangements and multiple reduction ratios support precision positioning, indexing and high-torque industrial applications such as robotics, rotary tables, camera/antenna positioning and automated machinery.

Technical specifications (summary)

• Product series: FHG-III
• Structure: Large hollow shaft; coaxial input/output
• Design: Integrated sealed flange, pre-filled with specialized lubricating grease
• Main bearing: High-rigidity cross roller bearing (integrated)
• Input connection: Timing pulleys or gear shafts
• Performance: High torque capacity, high rigidity, excellent rotational and positioning accuracy
• Available model sizes: FHG-14, FHG-17, FHG-20, FHG-25, FHG-32, FHG-40
• Reduction ratios (examples): 11, 14, 17, 20, 25, 32, 40
• Moment load data, rated/peak torques, permissible input speeds, backlash and design life: see model-specific tables in product documentation