China best Harmonic Drive, Actuator, Reducer Gearbox, Ultra-Thin Series, Hmhd-14-III cycloidal gearbox

Product Description


Product Description

The HMHD-lll series harmonic reducer has a ultra-thin compact structure. The axial length has been cut by 50% compared to HMHS series. The flexible spline adopts an ultra-thin hollow flanged structure, assembled with high rigidity cross roller bearings in the output end. Very suitable for applications that require flat designs. It’s currently available in specifications ranging from 14 to 32 sizes. Mainly used in high precision fields such as aerospace, robotics, semiconductors, power inspection, and automation equipment.

Principle of harmonic gear transmission
The harmonic gear drive was invented by the American inventor C.W.Musser in 1955. It is a new transmission mode using the elastic deformation of flexible working components to carry out movement or power transmission. It breaks through the mode of mechanical transmission using rigid components and uses a flexible component to achieve mechanical transmission. Thus, a series of special functions that are difficult to achieve with other drives are obtained. Because the deformation process of the intermediate flexible component is basically a symmetrical harmonic, it is named. In addition to the Soviet Union called this transmission waveform drive or flexible wheel drive, the United States, Britain, Germany, Japan and other countries are called “harmonic drive”.

Harmonic deceleration principle
The deceleration principle of harmonic gear transmission refers to the use of the relative motion of the flexwheel, rigid wheel and wave generator, mainly the controllable elastic deformation of the flexwheel to achieve motion and power transmission. The elliptic CAM in the wave generator rotates in the flexwheel so that the flexwheel deforms. When the flexwheel teeth and rigid wheel teeth at both ends of the long axis of the elliptic CAM of the wave generator are engaged, the flexwheel teeth at both ends of the short axis are detached from the rigid wheel teeth. The teeth between the long axis and the short axis of the wave generator are in a semi-meshing state that gradually enters the snapping along different sections of the perimeter of the flexwheel and the rigid wheel, which is called the snapping; In a semi-meshing state that gradually withdraws from engagement, it is called snapping out. When the wave generator continuously rotates, the flexwheel constantly deforms, so that the 2 wheel teeth in the biting, meshing, biting out and disengaging 4 kinds of motion constantly change their original working state, resulting in the wrong tooth movement, to achieve the active wave generator to the flexwheel movement transmission.

Product Parameters


Model Reduction ratio Rated torque at input 2000r/min Permissible CHINAMFG torque at start/stop Permissible max.value of ave.load torque instantaneous permissible max. torque Permissible max.input rotational speed Permissible max.input rotational speed Backlash(arc sec) Transmission accuracy(arc sec)
Nm Nm Nm Nm r/min r/min
14 50 3.5 11.4 4.6 23 8000 3500 20 90
80 5.1 15 6.2 29 20 90
100 5.1 18 7 33 20 90
17 50 10.5 22 17 46 7000 3500 20 90
80 14 29 21 54 20 90
100 15 35 26 67 20 90
20 50 16 37 23 66 6000 3500 20 90
80 23 49 28 78 10 90
100 27 54 32 90 10 90
25 50 26 66 36 121 5500 3500 20 60
80 42 91 62 157 10 60
100 45 105 71 175 10 60
32 50 50 143 71 255 4500 3500 20 60
80 79 202 126 350 10 60
100 91 221 143 399 10 60


Detailed Photos



Company Profile


HangZhou Yijiaang Automation Technology Co., Ltd. was established in 2018, specializing in the application development, sales and technical services of transmission components. Main business: planetary reducer, harmonic reducer, RV reducer, DD motor, linear motor, linear module, rotary spline screw, hollow rotary platform, CAM splitter and other products. Widely used in: CNC machine tools, packaging machinery, printing machinery, automation equipment, joint robots, medical equipment, AGV and many other fields. The company regards “providing quality products and services” as its due responsibility.
The company adheres to the spirit of technological innovation and customer service, with a positive attitude of continuous endeavour, creates the value of “quality is the core”, establishes the goal of “professional perfection”, and achieves the corporate vision of “making the world move”. Focus on transmission products technical services.



Q: What should I provide when I choose gearbox/speed reducer?
A: The best way is to provide the motor drawing with parameter. Our engineer will check and recommend the most suitable gearbox model for your refer.
Or you can also provide below specification as well:
1) Type, model and torque.
2) Ratio or output speed
3) Working condition and connection method
4) Input mode and input speed

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Application: Machinery, Agricultural Machinery, Car, Robot
Hardness: Hardened Tooth Surface
Installation: Horizontal Type
Layout: Coaxial
Gear Shape: Cylindrical Gear
Step: Single-Step
US$ 220/Piece
1 Piece(Min.Order)

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Common Problems with Gearboxes and How to Troubleshoot Them

Gearboxes can encounter various issues over time. Here are some common problems and troubleshooting steps:

  1. Noise and Vibration: Excessive noise or vibration may indicate misalignment, worn gears, or insufficient lubrication. Check alignment, inspect gears for wear, and ensure proper lubrication.
  2. Overheating: Overheating can be caused by high friction, inadequate lubrication, or overloading. Verify lubrication levels, reduce loads, and ensure proper ventilation.
  3. Leakage: Oil leaks may result from worn seals or gaskets. Inspect and replace damaged seals, and ensure proper sealing.
  4. Reduced Performance: Decreased performance could be due to worn gears, damaged bearings, or misalignment. Inspect components, replace damaged parts, and realign as needed.
  5. Gear Wear and Tooth Damage: Wear on gear teeth can result from excessive loads or poor lubrication. Replace worn gears and ensure proper lubrication.
  6. Shaft Misalignment: Shaft misalignment can lead to increased wear and noise. Realign shafts using precision measurement tools.
  7. Lubrication Issues: Inadequate or contaminated lubrication can cause premature wear. Regularly check and replace lubricant, and use the correct type for your gearbox.
  8. Bearing Failure: Bearing failure may result from overload, misalignment, or inadequate lubrication. Replace worn bearings and address underlying issues.
  9. Seal Damage: Damaged seals can lead to leaks and contamination. Replace seals and ensure proper installation.
  10. Gearbox Lockup: Gearbox lockup may occur due to foreign objects or damaged components. Disassemble and inspect the gearbox, removing any obstructions and replacing damaged parts.

Regular maintenance, proper lubrication, and timely troubleshooting are key to addressing gearbox problems and ensuring smooth operation.

China best Harmonic Drive, Actuator, Reducer Gearbox, Ultra-Thin Series, Hmhd-14-III   cycloidal gearbox	China best Harmonic Drive, Actuator, Reducer Gearbox, Ultra-Thin Series, Hmhd-14-III   cycloidal gearbox
editor by CX 2024-01-26