what are the types of harmonic drives

 Harmonic reducer has a series of advantages such as large transmission ratio, simple structure, small size, light weight and high precision. Harmonic gear transmission technology and devices are used in radar communications, industrial robots, precision machine tools, instrumentation, textile printing, precision optical equipment, medical equipment and other fields. So what are the types of harmonic drives and what are the classifications?

1. According to the principle of action of flexible wheel and wave generator, it is classified into electromagnetic coupling type and mechanical connection type. The deforming force of the electromagnetic coupling type flexspline is generated by electromagnetic coupling between the wave generator and the uniform device on the coils on the circumference of the flexspline. The mechanical connection type uses mechanical force to make the flexible wheel move.

2. According to the configuration of the wave generator of the harmonic reducer relative to the flexible wheel, it is classified into an external wave generator and an internal wave generator. The external wave generator has large structure size and large moment of inertia, so it is not suitable for high speed. The internal type is generally used when a fixed deformation wave generator is used.

3. According to the transmission form, it is classified into end face harmonic gear drive, radial harmonic gear drive and harmonic spiral drive. The end face harmonic gear drive is a type of spatial gearing. This type of drive has a small axial size and a large torsional rigidity of the flexspline. Radial harmonic gear transmission belongs to the plane toothing type.

4. According to the deformation wave number, it is classified into single wave, double wave and triple wave transmission. The gear transmission wave number of the harmonic reducer refers to the number of cycles that a certain point on the flexible wheel deforms when the wave generator rotates one circle. The deformation of the flexspline of the single-wave gear transmission is asymmetrical, so the design requirements for the tooth profile and the cam profile of the wave generator are too high. The number of teeth of the flexible wheel and the rigid wheel of the double-wave gear transmission differs by 2, and the structure is relatively simple and commonly used. The three-wave alignment is good, the eccentricity error is small, but the processing is complicated, and the number of repeated bending of the flexspline increases, so the fatigue life of the flexspline is relatively low. Generally rarely used.

With the development of the times, the continuous upgrading of industrial intelligent robots, medical equipment, radio communications, CNC machine tools and other equipment, the requirements continue to increase, so the transmission requirements of the harmonic reducer will also become higher and higher. Research on the harmonic gear Classification helps to select and use more suitable harmonic reducer types.

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