Strain Wave Gears
LHD Ultra-Flat Hollow-Shaft Flexspline Strain Wave Gear
Ref: LHD

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.

Product details
Parameters


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


ModelReduction
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·mN·mN·mN·marcsecr/minr/min
14503.7124.823≤1085003500
805.4167.735
1005.4197.735
175011231848≤1073003500
8015291961
10016372771
12016372771
205017392469≤1065003500
8024513389
10028573495
12028603495
16028643495
2550276938127≤1056003500
80449660179
1004711075184
1204711775204
1604712375204
32505315175268≤1048003500
8083213117398
10096233151420
12096247151445
16096261151445
405096281137480≤1040003000
80144364198686
100185398260700
120205432315765
160206453316765


ModelReduction
Ratio

Starting

Torque

Backdring

Toque

Ratcheting

Torque

Hysteresis

loss

Torsional RigidityAngle
Transmission
Accuracy
Buckling
Torque
K1K2K3
cN·mN·mN·marcsec×10⁴ N·m/radarcsecN·m
14506.23.7881500.290.370.4790130
8054.31101200.40.440.61
1004.85.884
175019111501200.670.881.290260
801615200600.840.941.3
1001721160
1201328120
205025152201201.11.3260470
802321350601.31.72.5
1002227260
1202233240
1602242220
2550392445012022.73.760850
803632680602.73.74.7
1003441500
1203451470
1603364450
325060369801204.76.18.4601800
8055461400606.17.811
10050601000
1204868980
1604791980
4050955718001208.81115603600
808372280060111420
10078942100
120771131900
160741431800