Mechanical Components--Harmonic Drive Gear

1. Large transmission speed ratio.
The single-stage harmonic gear transmission speed ratio ranges from 70 to 320, in some devices it can reach 1000, and the multi-stage transmission speed ratio can reach more than 30,000. It can be used not only for speed reduction, but also for speed increase occasions.

2. High carrying capacity.
This is because the number of teeth meshed at the same time in the harmonic gear drive is large, and the number of teeth meshed at the same time in the double-wave drive can reach more than 30% of the total number of teeth. Moreover, the flexspline uses high-strength materials, and the teeth and teeth are in surface contact.

3. High transmission accuracy.
This is because the number of teeth meshed at the same time in the harmonic gear transmission is large, and the error is averaged, that is, multi-tooth meshing has a mutual compensation effect on the error, so the transmission accuracy is high. In the case of the same gear accuracy grade, the transmission error is only about 1/4 of that of ordinary cylindrical gear transmission. At the same time, the radius of the wave generator can be changed slightly to increase the deformation of the flexspline so that the backlash is small, and even the backlash-free meshing can be achieved, so the harmonic gear reducer has a small idle stroke and is suitable for reverse rotation.

4. High transmission efficiency and smooth movement.
Due to the uniform radial movement of the flexspline gear teeth during the transmission process, even if the input speed is very high, the relative slip speed of the gear teeth is still extremely low (so it is one percent of the ordinary involute gear transmission) Therefore, the gear teeth are less worn and the efficiency is high (up to 69%~96%). Also, because both sides of the gear participate in the work when engaging in and out, there is no impact phenomenon and the movement is stable.

5. Simple structure, few parts and convenient installation.
There are only three basic components, and the input and output shafts are coaxial, so the structure is simple and the installation is convenient.

6. Small size and lightweight.
Compared with the general reducer, when the output torque is the same, the volume of the harmonic gear reducer can be reduced by 2/3, and the weight can be reduced by 1/2.

7. Can transmit motion to confined space.
Using the flexible characteristics of the flexspline, this valuable advantage of the wheel drive is unmatched by other existing drives.

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