Strain wave servo-gearbox FHG-I-20

coaxialkeyed borekeyed shaft

Introduction
The FHG-I series strain wave gearbox integrates a cam‑type wave generator. The cam shaft bore diameter is adjustable to match the customer's motor model. The input shaft inserts into the inner bore of the wave generator and is secured by a flat key. A built‑in cross‑roller main bearing supports the assembly. Typical connection methods use either the rigid wheel fixed with the flexspline as output, or the flexspline fixed with the rigid wheel as output.

Features

• Integrated cam wave generator for flexible mounting options.
• High positioning and rotational accuracy (backlash values in arc‑seconds provided per model).
• Significant torque capacity across the FHG range.
• Rigid main support via built‑in cross‑roller bearing.
• Coaxial input and output layout simplifies system integration.
• Cam shaft bore size configurable to customer motor; input shaft connection via flat key.

Moment load data (selected)

• FHG‑14 — Design Mbdi: 41 Nm; Instant Mb max: 80 Nm; Ft di 270 N / Ft max 490 N; Fa di 270 N / Fa max 490 N.
• FHG‑17 — Design Mbdi: 72 Nm; Instant Mb max: 140 Nm; Ft di 400 N / Ft max 700 N; Fa di 400 N / Fa max 700 N.
• FHG‑20 — Design Mbdi: 140 Nm; Instant Mb max: 280 Nm; Ft di 650 N / Ft max 1150 N; Fa di 650 N / Fa max 1150 N.
• FHG‑25 — Design Mbdi: 243 Nm; Instant Mb max: 480 Nm; Ft di 900 N / Ft max 1600 N; Fa di 900 N / Fa max 1600 N.
• FHG‑32 — Design Mbdi: 460 Nm; Instant Mb max: 900 Nm; Ft di 1350 N / Ft max 2300 N; Fa di 1350 N / Fa max 2300 N.
• FHG‑40 — Design Mbdi: 600 Nm; Instant Mb max: 1200 Nm; Ft di 2000 N / Ft max 3500 N; Fa di 2000 N / Fa max 3500 N.

Performance — selected values by reduction ratio

• Ratio 14 (size 50–120) — Rated torque examples: 7–10 Nm @ reference speeds; peak torque up to ~36 Nm; max input speeds vary by size (e.g. 46–70 r/min entries in table); backlash and design life given per configuration.
• Ratio 17 (size 50–120) — Rated torque examples: 21–31 Nm; peak torque up to ~70 Nm; max input speed range reported up to ~143 r/min for some sizes.
• Ratio 20 (size 50–160) — Rated torque examples: 33–52 Nm; peak torque up to ~120 Nm; max input speed and rated speeds vary by size (tables list exact values).
• Ratio 25 (size 50–120) — Rated torque examples: 51–87 Nm; peak torque up to ~217 Nm; max input speeds reported up to ~395 r/min for larger sizes.
• Ratio 32 (size 50–120) — Rated torque examples: 99–178 Nm; peak torque up to ~459 Nm; max input speeds reported up to ~892 r/min.
• Ratio 40 (size 50–120) — Rated torque examples: 178–382 Nm; peak torque up to ~802 Nm; max input speeds reported up to ~1530 r/min depending on size.

Mounting and design notes

• Input shaft inserts into the wave generator bore and is fixed by a flat key; cam bore size can be adapted to the motor model.
• Multiple mounting options enabled by the integrated cam structure.
• Main bearing is a built‑in cross‑roller type for high stiffness in shaft support.
• Detailed tables on starting torque, permissible moments (Mb, Ft, Fa), permissible speeds, backlash, weight and design life are provided per model and reduction ratio — consult the product sheet for exact figures for each configuration.
• Series designation: FHG (FHG‑I noted on sheet).