Strain wave gear reducer FHG-II-17

coaxialkeyed bore5 - 10 Nm

Introduction
The FHG-II series strain wave drive integrates a cross‑roller bearing coupling on the wave generator to enable automatic fine adjustment of coaxiality. The cam‑shaft bore can be tailored to the customer's motor; the input shaft fits into the wave‑generator inner bore and is connected with a flat key. A built‑in cross‑roller main bearing provides structural rigidity. Typical output configurations are: rigid wave wheel fixed with flexspline output, or flexspline fixed with rigid wheel output.

Features

• Wave generator with cross‑roller bearing coupling for simplified installation and alignment.
• Excellent rotational and positioning accuracy (low backlash).
• High torque capacity across model range.
• High structural rigidity via integrated main bearing.
• Coaxial input and output for compact drive integration.

Specification — Starting torque (Sheet 1, unit: cNm)
Available reduction ratios: 11, 14, 17, 20, 25, 32, 40. Example starting torque values by housing size (cNm): size 50: —, 8.8, 27, 36, 56, 85, 136; size 80: —, 7.5, 25, 33, 50, 74, 117; size 100: —, 6.9, 24, 32, 49, 72, 112; size 120: —, 6.9, 24, 31, 48, 68, 110; size 160: —, —, —, 31, 47, 67, 105.

Specification — Moment load table (Sheet 2)

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

Specification — Performance / Rated torque (Sheet 3, excerpts)
Sheet 3 details per‑model rated torque at 2000 r/min input, permissible peak torques for start/stop, permissible average load torque, maximum permissible input speed (grease), backlash (Arc‑sec), weight and design life. Example excerpts: Model 14 @50 rated torque 7 Nm (peak 23 Nm), allowable input speed entries up to 8500–15000 r/min; Model 17 @50 rated 21 Nm (peak 44 Nm); Model 20 @50 rated 33 Nm; Model 25 @50 rated 51 Nm; Model 32 @50 rated 99 Nm; Model 40 @50 rated 178 Nm. Backlash typically ≤20 Arc‑sec; design life and max input speeds vary by variant and lubrication (examples 10000–15000 h, grease speeds 3500–15000 r/min depending on size/ratio).

Application / Mounting notes
The cam‑shaft bore can be machined to match the customer's motor interface. Input shaft is inserted into the inner bore of the wave generator and secured by a flat key. Common connection modes: rigid wave wheel fixed with flexspline output, or flexspline fixed with rigid wheel output. Coaxial arrangement simplifies drivetrain integration.

Technical characteristics / specifications

• Series: FHG (variants include FHG‑I to FHG‑V; FHG‑II described here).
• Wave generator coupling: cross‑roller bearing coupling enabling automatic coaxial fine‑tuning.
• Main bearing: integrated cross‑roller high‑rigidity main bearing.
• Input/output: coaxial arrangement; input shaft keyed into wave generator bore; cam‑shaft bore adjustable.
• Performance highlights: low backlash (≤20 Arc‑sec typical), wide range of reduction ratios and torque capacities across FHG‑14 to FHG‑40.
• Data availability: detailed tables provide starting torque, rated torque, peak/persistent torque limits, radial/axial load limits (Ft/Fa), permissible input speeds and design life per model.