Strain wave servo-gearbox FSG-II-40

coaxialkeyed bore20 - 50 Nm

Introduction
The FSG-II series strain wave gear uses a cross-slider coupling mechanism for the wave generator. Cam shaft bore dimensions are customizable to fit specific motor models. The input shaft engages directly with the wave generator inner bore via a keyed connection. Typical installation fixes the circular spline at the base with the flexspline as the output.

Features

• Wave generator with integrated cam structure: improved tolerance to machining precision and self-alignment to maintain required coaxiality.
• Compact design with high torque capacity.
• High rotational and positioning accuracy; backlash typically ≤20 arc sec.
• Coaxial input and output layout.
• Designed for robot arm end-effectors and sealed rotary tables.

Starting torque table (unit: cNm)
Reduction ratio: 11 | 14 | 17 | 20 | 25 | 32 | 40
50: — | 4.5 | 6.7 | 8.6 | 17 | 34 | 61
80: — | 3.1 | 4.4 | 5.4 | 10 | 21 | 39
100: — | 2.8 | 3.7 | 4.7 | 8.8 | 20 | 34
120: — | — | 3.4 | 4.2 | 8 | 17 | 31
160: — | — | — | 3.6 | 6.9 | 15 | 26

Mechanical allowable loads by model (Sheet 2)
FSG-14: Mb di 20 Nm | Mb max 40 Nm; Ft di 180 N | Ft max 320 N; Fa di 180 N | Fa max 320 N
FSG-17: Mb di 30 Nm | Mb max 60 Nm; Ft di 230 N | Ft max 400 N; Fa di 230 N | Fa max 400 N
FSG-20: Mb di 42 Nm | Mb max 80 Nm; Ft di 270 N | Ft max 480 N; Fa di 270 N | Fa max 480 N
FSG-25: Mb di 80 Nm | Mb max 160 Nm; Ft di 440 N | Ft max 770 N; Fa di 440 N | Fa max 770 N
FSG-32: Mb di 220 Nm | Mb max 440 Nm; Ft di 900 N | Ft max 1600 N; Fa di 900 N | Fa max 1600 N
FSG-40: Mb di 320 Nm | Mb max 650 Nm; Ft di 1000 N | Ft max 1750 N; Fa di 1000 N | Fa max 1750 N

Performance and dimensional table (summary of Sheet 3)
Table columns: Model | Reduction ratio | Rated torque at 2000 r/min input (Nm | kgfm) | Permissible peak torque at start/stop (Nm | kgfm) | Permissible maximum average load torque (Nm | kgfm) | Permissible maximum momentary torque (Nm | kgfm) | Permissible maximum input rotational speed (r/min, Grease) | Permissible average input rotational speed (r/min, Grease) | Backlash (Arc Sec) | Weight (kg) | Design life (Hour) / Notes

Representative extracts (ratio = 50):
FSG-14: rated 7 Nm / 0.7 kgfm; peak 23 Nm / 2.3 kgfm; max average 9 Nm / 0.9 kgfm; momentary 46 Nm / 4.7 kgfm; max input speed 8500 r/min; average 3500 r/min; weight 0.51 kg; design life ≈10000 h.
FSG-17: rated 21 Nm / 2.1 kgfm; peak 44 Nm / 4.5 kgfm; max average 34 Nm / 3.4 kgfm; momentary 91 Nm / 9 kgfm; max input speed 7300 r/min; average 3500 r/min; weight 0.67 kg; design life ≈10000 h.
FSG-20: rated 33 Nm / 3.3 kgfm; peak 73 Nm / 7.4 kgfm; max average 44 Nm / 4.5 kgfm; momentary 127 Nm / 13 kgfm; max input speed 6500 r/min; average 3500 r/min; weight 0.96 kg; design life ≈10000 h.
FSG-25: rated 51 Nm / 5.2 kgfm; peak 127 Nm / 13 kgfm; max average 72 Nm / 7.3 kgfm; momentary 242 Nm / 25 kgfm; max input speed 5600 r/min; average 3500 r/min; weight 1.46 kg; design life ≈10000 h.
FSG-32: rated 99 Nm / 10 kgfm; peak 281 Nm / 29 kgfm; max average 140 Nm / 14 kgfm; momentary 497 Nm / 51 kgfm; max input speed 4800 r/min; average 3500 r/min; weight 3.11 kg; design life ≈15000 h.
FSG-40: rated 178 Nm / 18 kgfm; peak 523 Nm / 53 kgfm; max average 255 Nm / 26 kgfm; momentary 892 Nm / 91 kgfm; max input speed 4000 r/min; average 3000 r/min; weight 4.60 kg; design life ≈10000–15000 h depending on ratio.

Characteristics / Technical specifications

• Series: FSG-II strain wave gear.
• Wave generator: cross-slider coupling with integrated cam structure for self-alignment and relaxed machining tolerance.
• Cam shaft bore dimensions: customizable for specific motor models.
• Input connection: keyed between input shaft and wave generator inner bore.
• Typical installation: circular spline fixed at base, flexspline as output; coaxial input/output.
• Starting torque, allowable loads, rated and peak torques, permitted speeds, backlash, weights and design life are provided per model and reduction ratio (see tables above).
• Typical applications: robot arm end-effectors, sealed rotary tables requiring compact, coaxial, high-torque, high-precision reduction.