(1) The transmission speed ratio is large.The single-stage harmonic gear transmission speed ratio ranges from 70 to 320, and can reach 1,000 in some devices, and the multi-stage transmission speed ratio can reach more than 30,000.It can be used not only for deceleration, but also for speeding up.
(2) High carrying capacity.This is because the number of teeth meshing at the same time in the harmonic gear transmission is large, and the number of teeth meshing at the same time in the double wave transmission can reach more than 30% of the total number of teeth, and the flexible spline is made of high-strength materials, and the teeth are in surface contact.
(3) High transmission precision.This is because the number of teeth meshing at the same time in the harmonic gear transmission is large, and the errors are averaged, that is, the multi-teeth meshing has a mutual compensation effect on the errors, so the transmission accuracy is high.In the case of the same gear precision 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 slightly changed to increase the deformation of the flexspline, so that the backlash is very small, and even meshing without backlash can be achieved. Therefore, the transmission space of the harmonic gear reducer is small, and it is suitable for reverse rotation.
(4) High transmission efficiency and smooth movement.Since the gear teeth of the flexspline move uniformly in the radial direction during the transmission process, even if the input speed is high, the relative slip speed of the gear teeth is still extremely low (so it is 100% of that of ordinary involute gear transmission) , Therefore, the tooth wear is small and the efficiency is high (up to 69%~96%).And because both sides of the gear participate in the work when the gear is engaged in and out, there is no impact phenomenon and the movement is stable.
(5) The structure is simple, the number of parts is small, and the installation is convenient.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 light weight.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) It can transmit motion to the confined space.Utilizing the flexible characteristics of the flexible spline, this valuable advantage of the wheel drive is unmatched by other existing drives.
