The LHD series represents an ultra-flat strain wave reducer engineered specifically to overcome tight axial space limitations. Its design achieves an axial length approximately 50% shorter than the standard LHS/LHSG series, enabling a dramatically thinner transmission module. This series capitalizes on its structural strengths—including a lightweight build, super-flat profile, and large hollow bore—to deliver a compact, high-performance solution ideal for advanced robotics and precision motion systems where space-saving is paramount.
The LHD ultra-flat hollow-shaft flexspline strain wave gear has an ultra-flat structure, thin profile, and low weight. In operation, it maintains high rigidity, ultra-low backlash, and a substantial load-bearing capacity.
Leaderdrive supplies stain wave gears to industrial enterprises and research institutes around the world. If you would like to know more about our ultra-flat hollow-shaft models, please contact our technical team.
Applications:
The LHD ultra-flat hollow-shaft flex spline strain wave gear can be widely used in robots, humanoid robots, printed circuit manufacturing equipment, metal machine tools, and other fields.
Models:
The LHD ultra-flat hollow-shaft flex spline strain wave gear series is divided into two models according to the different connection form of the input end and the wave generator cam:
LHD-I: The input shaft is directly matched and connected with the inner hole of the wave generator.
LHD-III: There is a large-diameter hollow shaft hole in the middle of the wave generator cam. The gear is designed with a supporting bearing inside, and the fully sealed structure is easy to install.
Superior Performance Characteristics:
High Torque & Stiffness: Maintains high torque capacity and torsional stiffness despite its reduced size, ensuring robust and reliable power transmission.
Exceptional Motion Accuracy: Delivers zero-backlash operation combined with high positioning accuracy and repeatability, which is critical for precise motion control
Coaxial Input & Output: Preserves a simple and space-efficient inline shaft configuration for straightforward integration with motors and driven elements.
Structural Advantages:
Super-Flat, Hollow Structure: Integrates an exceptionally low-profile design with a large through-bore. This hollow shaft allows for the passage of cables, tubing, or other components, simplifying machine design and routing.
Lightweight & Compact: The optimized flat structure contributes to significant weight and volume savings, facilitating integration into sleek and modern mechanical assemblies.
If you want to know more about our products, you can download our Product Introduction Manual and 3D Model here.
LHD Series Technical Parameters
| Model | Reduction Ratio | Rated Torque | Allowable Peak Torque at Start/Stop | Allowable Max. Value of Ave. Load Torque | Max. Allowable Peak Torque | Max. Backlash | Max. Allowable Input Speed | Rated Input Speed |
| N·m | N·m | N·m | N·m | arcsec | r/min | r/min | ||
| 14 | 50 | 3.7 | 12 | 4.8 | 23 | ≤10 | 8500 | 3500 |
| 80 | 5.4 | 16 | 7.7 | 35 | ||||
| 100 | 5.4 | 19 | 7.7 | 35 | ||||
| 17 | 50 | 11 | 23 | 18 | 48 | ≤10 | 7300 | 3500 |
| 80 | 15 | 29 | 19 | 61 | ||||
| 100 | 16 | 37 | 27 | 71 | ||||
| 120 | 16 | 37 | 27 | 71 | ||||
| 20 | 50 | 17 | 39 | 24 | 69 | ≤10 | 6500 | 3500 |
| 80 | 24 | 51 | 33 | 89 | ||||
| 100 | 28 | 57 | 34 | 95 | ||||
| 120 | 28 | 60 | 34 | 95 | ||||
| 160 | 28 | 64 | 34 | 95 | ||||
| 25 | 50 | 27 | 69 | 38 | 127 | ≤10 | 5600 | 3500 |
| 80 | 44 | 96 | 60 | 179 | ||||
| 100 | 47 | 110 | 75 | 184 | ||||
| 120 | 47 | 117 | 75 | 204 | ||||
| 160 | 47 | 123 | 75 | 204 | ||||
| 32 | 50 | 53 | 151 | 75 | 268 | ≤10 | 4800 | 3500 |
| 80 | 83 | 213 | 117 | 398 | ||||
| 100 | 96 | 233 | 151 | 420 | ||||
| 120 | 96 | 247 | 151 | 445 | ||||
| 160 | 96 | 261 | 151 | 445 | ||||
| 40 | 50 | 96 | 281 | 137 | 480 | ≤10 | 4000 | 3000 |
| 80 | 144 | 364 | 198 | 686 | ||||
| 100 | 185 | 398 | 260 | 700 | ||||
| 120 | 205 | 432 | 315 | 765 | ||||
| 160 | 206 | 453 | 316 | 765 |
| Model | Reduction Ratio | Starting Torque | Backdring Toque | Ratcheting Torque | Hysteresis loss | Torsional Rigidity | Angle Transmission Accuracy | Buckling Torque | ||
| K1 | K2 | K3 | ||||||||
| cN·m | N·m | N·m | arcsec | ×10⁴ N·m/rad | arcsec | N·m | ||||
| 14 | 50 | 6.2 | 3.7 | 88 | 150 | 0.29 | 0.37 | 0.47 | 90 | 130 |
| 80 | 5 | 4.3 | 110 | 120 | 0.4 | 0.44 | 0.61 | |||
| 100 | 4.8 | 5.8 | 84 | |||||||
| 17 | 50 | 19 | 11 | 150 | 120 | 0.67 | 0.88 | 1.2 | 90 | 260 |
| 80 | 16 | 15 | 200 | 60 | 0.84 | 0.94 | 1.3 | |||
| 100 | 17 | 21 | 160 | |||||||
| 120 | 13 | 28 | 120 | |||||||
| 20 | 50 | 25 | 15 | 220 | 120 | 1.1 | 1.3 | 2 | 60 | 470 |
| 80 | 23 | 21 | 350 | 60 | 1.3 | 1.7 | 2.5 | |||
| 100 | 22 | 27 | 260 | |||||||
| 120 | 22 | 33 | 240 | |||||||
| 160 | 22 | 42 | 220 | |||||||
| 25 | 50 | 39 | 24 | 450 | 120 | 2 | 2.7 | 3.7 | 60 | 850 |
| 80 | 36 | 32 | 680 | 60 | 2.7 | 3.7 | 4.7 | |||
| 100 | 34 | 41 | 500 | |||||||
| 120 | 34 | 51 | 470 | |||||||
| 160 | 33 | 64 | 450 | |||||||
| 32 | 50 | 60 | 36 | 980 | 120 | 4.7 | 6.1 | 8.4 | 60 | 1800 |
| 80 | 55 | 46 | 1400 | 60 | 6.1 | 7.8 | 11 | |||
| 100 | 50 | 60 | 1000 | |||||||
| 120 | 48 | 68 | 980 | |||||||
| 160 | 47 | 91 | 980 | |||||||
| 40 | 50 | 95 | 57 | 1800 | 120 | 8.8 | 11 | 15 | 60 | 3600 |
| 80 | 83 | 72 | 2800 | 60 | 11 | 14 | 20 | |||
| 100 | 78 | 94 | 2100 | |||||||
| 120 | 77 | 113 | 1900 | |||||||
| 160 | 74 | 143 | 1800 | |||||||







