Strain wave servo-gearbox FHG-II-20

coaxialkeyed borelow-backlash

Introduction
The FHG-II strain wave drive (series FHG) integrates a wave generator with a cross-roller bearing coupling that enables automatic fine-tuning of coaxiality. The cam-shaft bore can be adjusted to match the customer's motor; the input shaft fits into the wave generator inner bore and connects via a flat key. A built-in cross-roller main bearing provides the primary support. Typical connection methods are: rigid wheel fixed with flexspline output, or flexspline fixed with rigid wheel output.

Key features

• Wave generator with cross-roller bearing coupling for simplified installation.
• Excellent rotational accuracy and positioning precision.
• High torque capacity across available models.
• High structural rigidity with coaxial input and output.
• Adjustable cam-shaft bore to suit customer motor interfaces; direct input-shaft fitting with flat key.

Performance & tables (summary)
Detailed technical tables are provided per model (FHG-14, FHG-17, FHG-20, FHG-25, FHG-32, FHG-40) and per reduction ratio. Available data include:

• Starting torque table (unit: cNm) by type and reduction ratio.
• Rated torque at 2000 r/min input, permissible peak torque at start/stop, and permissible average-load torque.
• Permissible maximum input speed, backlash (Arc Sec), weight and design life for each model/ratio.
• Moment load capacities (Mb, Ft, Fa) and instant permissible values per model.

Connection & mechanical notes

• Cam-shaft bore size is adaptable to customer motor models.
• Input shaft inserts directly into the wave generator inner bore and is secured with a flat key.
• Standard integration: either rigid-wheel fixed / flexspline output or flexspline fixed / rigid-wheel output depending on installation.

Technical specifications

• Series: FHG (FHG-II reference).
• Wave generator coupling: cross-roller bearing coupling for automatic coaxial fine-tuning.
• Main bearing: built-in cross-roller high-rigidity main bearing.
• Input/output: coaxial arrangement; direct input-shaft interface.
• Covered models: FHG-14, FHG-17, FHG-20, FHG-25, FHG-32, FHG-40 (see tables for exact values by ratio).
• Typical backlash: ≤ 20 arc sec depending on model/configuration.
• Performance data: rated and peak torques, radial/axial load limits, permissible speeds, weights and design life documented in technical tables.