Harmonic drive reducers are primarily composed of four basic components: wave generators, flexible gears, flexible bearings, and rigid gears. A harmonic drive reducer is a type of gear transmission that relies on the wave generator and flexible bearings to produce a controllable elastic deformation in the flexible gears, which then mesh with the rigid gears to transmit motion and power.

Harmonic Gear Drive Reducers are a new type of reducer developed based on the principle of planetary gear transmission, specifically within the fields of Mechanical Engineering (first-level discipline), Transmission (second-level discipline), and Gear Transmission (third-level discipline). Harmonic Gear Drive, commonly referred to as Harmonic Drive.