Strain wave servo-gearbox FHG-II-25

coaxialkeyed borelow-backlash

Introduction
The FHG-II strain wave drive (series FHG) integrates a wave generator with a cross-roller bearing coupling, enabling automatic fine-tuning of coaxiality. The cam shaft hole diameter is adaptable to customer motor models; the input shaft fits directly into the wave generator bore and secures with a flat key. A built-in high-rigidity cross-roller main bearing supports high radial and torsional stiffness. Typical connection methods are: rigid wheel fixed / flexspline output or flexspline fixed / rigid wheel output.

Features

• Wave generator with cross-roller bearing coupling simplifies installation and alignment.
• Excellent rotational and positioning accuracy (backlash ≤ 20 Arc Sec typical).
• High torque capacity across FHG-14 to FHG-40 sizes.
• High torsional and radial rigidity due to integrated cross-roller main bearing.
• Coaxial input and output for compact motor integration.

Starting torque of FHG series (unit: cNm)
Type / Reduction ratio : 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 FHG series
FHG-14 — Mbdi 41 Nm; Mb max 80 Nm; Ftdi 270 N (Ft max 490 N); Fadi 270 N (Fa max 490 N).
FHG-17 — Mbdi 72 Nm; Mb max 140 Nm; Ftdi 400 N (Ft max 700 N); Fadi 400 N (Fa max 700 N).
FHG-20 — Mbdi 140 Nm; Mb max 280 Nm; Ftdi 650 N (Ft max 1150 N); Fadi 650 N (Fa max 1150 N).
FHG-25 — Mbdi 243 Nm; Mb max 480 Nm; Ftdi 900 N (Ft max 1600 N); Fadi 900 N (Fa max 1600 N).
FHG-32 — Mbdi 460 Nm; Mb max 900 Nm; Ftdi 1350 N (Ft max 2300 N); Fadi 1350 N (Fa max 2300 N).
FHG-40 — Mbdi 600 Nm; Mb max 1200 Nm; Ftdi 2000 N (Ft max 3500 N); Fadi 2000 N (Fa max 3500 N).

Performance & rated values (selected entries)
Model | Reduction ratio | Rated torque at 2000 r/min input (Nm) | Permissible peak torque (Nm) | Permissible average load torque (Nm) | Permissible max input speed (r/min) | Backlash (Arc Sec) | Design life (h)
FHG-14 — Reduction 50: Rated 7 Nm; Peak 23 Nm; Average 9 Nm; Input speed 8500 / 3500; Backlash ≤20; Design life 10000 h.
FHG-17 — Reduction 50: Rated 21 Nm; Peak 44 Nm; Average 34 Nm; Input speed 7300 / 3500; Backlash ≤20; Design life 10000 h.
FHG-20 — Reduction 50: Rated 33 Nm; Peak 73 Nm; Average 44 Nm; Input speed 6500 / 3500; Backlash ≤20; Design life 10000 h.
FHG-25 — Reduction 50: Rated 51 Nm; Peak 127 Nm; Average 72 Nm; Input speed 5600 / 3500; Backlash ≤20; Design life 10000 h.
FHG-32 — Reduction 50: Rated 99 Nm; Peak 281 Nm; Average 140 Nm; Input speed 4800 / 3500; Backlash ≤20; Design life 10000 h.
FHG-40 — Reduction 50: Rated 178 Nm; Peak 523 Nm; Average 255 Nm; Input speed 4000 / 3000; Backlash ≤20; Design life 10000 h.

Characteristics / technical specifications

• Series: FHG (FHG-II variant described).
• Wave generator: cross-roller bearing coupling enabling automatic coaxiality fine-tuning.
• Main bearing: built-in high-rigidity cross-roller bearing.
• Cam shaft hole: adjustable to customer motor models; input shaft connects via flat key.
• Connection methods: rigid wheel fixed / flexspline output or flexspline fixed / rigid wheel output.
• Key performance: high rigidity, high torque capacity, excellent rotational and positioning accuracy; backlash ≤20 Arc Sec.
• Provided data: starting torque values, moment load capacities (Mb, Ft, Fa), rated and peak torques, permissible speeds, variant weights and design life (typically 10000 h).