Strain wave gear reducer FHG series

coaxialkeyed bore5 - 10 Nm

Introduction
The FHG-II series strain wave drive integrates a cross-roller bearing coupling for the wave generator to enable automatic fine adjustment of coaxiality. The camshaft bore can be adapted to the customer's motor model. The input shaft fits directly into the inner bore of the wave generator and connects via a flat key. A built-in high-rigidity cross-roller main bearing supports the assembly. Typical connection methods are rigid wheel end fixed with flexspline output, or flexspline fixed with rigid wheel end output.

Key features

• Wave generator with cross-roller bearing coupling for simplified installation and automatic coaxial fine-tuning.
• Excellent rotational and positioning accuracy (low backlash).
• High torque capacity across multiple reduction ratios.
• High structural rigidity with integrated cross-roller main bearing.
• Coaxial input and output for compact drivetrain integration.
• Input shaft direct-fit with flat key; camshaft bore size customizable to motor models.

Starting torque (unit: cNm)
Representative starting torque values by reduction ratio (see full tables for complete data):
Reduction ratios | 11 | 14 | 17 | 20 | 25 | 32 | 40
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

Moment load capacities
Design values and instant permissible maxima (examples by model):
FHG-14 — Mb design 41 Nm (Mb max 80 Nm); Ft design 270 N (Ft max 490 N); Fa design 270 N (Fa max 490 N).
FHG-17 — Mb design 72 Nm (Mb max 140 Nm); Ft design 400 N (Ft max 700 N); Fa design 400 N (Fa max 700 N).
FHG-20 — Mb design 140 Nm (Mb max 280 Nm); Ft design 650 N (Ft max 1150 N); Fa design 650 N (Fa max 1150 N).
FHG-25 — Mb design 243 Nm (Mb max 480 Nm); Ft design 900 N (Ft max 1600 N); Fa design 900 N (Fa max 1600 N).
FHG-32 — Mb design 460 Nm (Mb max 900 Nm); Ft design 1350 N (Ft max 2300 N); Fa design 1350 N (Fa max 2300 N).
FHG-40 — Mb design 600 Nm (Mb max 1200 Nm); Ft design 2000 N (Ft max 3500 N); Fa design 2000 N (Fa max 3500 N).

Performance summary

• Performance tables provide rated torque at 2000 rpm input, permissible peak torque at start/stop, permissible maximum average-load torque, permissible maximum input speed (grease), backlash (arc sec), weight (kg) and design life (hours) per model and reduction ratio.
• Example rated torque ranges (selected): Model 14 (50–120 ratios) — rated torques from ~7 to ~36 Nm depending on ratio; Model 17 — higher rated torques (e.g., 21–70 Nm); Model 20/25/32/40 — progressively higher rated torques up to several hundred Nm as size increases.

Downloads
Model-specific drawings and datasheets available for download (3D/PDF): examples include FHG-14-XX-U-II, FHG-17-XX-U-II, FHG-20-XX-U-II, FHG-25-XX-U-II, FHG-32-XX-U-II.

Technical specifications

• Series: FHG-II (strain wave drive).
• Coupling: wave generator with cross-roller bearing coupling for automatic coaxial fine-tuning.
• Bearing: built-in high-rigidity cross-roller main bearing.
• Input shaft: direct-fit into inner bore; connection via flat key; camshaft bore size adjustable for customer motor models.
• Connection methods: rigid wheel end fixed / flexspline output or flexspline fixed / rigid wheel end output.
• Included data: starting torque (cNm) by ratio; moment/load tables (Mb, Ft, Fa design and maxima); full performance tables (rated torque, peak torque, permissible average-load torque, max input speeds, backlash, weight, design life).

Notes
All values depend on selected model and reduction ratio. Refer to the detailed specification tables and downloadable datasheets for exact numerical values and configuration-specific limits.