The wave generator of the HCS-I series Harmonic Drive Reducer consists of a specially designed thin ball bearing mounted on an oval hub. This acts as a high-efficiency torque converter and serves as the input for the gear connected to the motor shaft.

The outer surface of the Wave Generator plug of the HCS-I series Harmonic Drive Reducer has an oval shape and is carefully machined to precise specifications. A wave generator is usually used as an input, usually connected to a servo motor.
The Flexspline of the HCS-I series Harmonic Drive Reducer is a thin cylindrical cup made of alloy steel with external teeth on the open end of the cup. The Flexspline is radially compliant but twists very stiffly. When the wave generator is inserted into the Flexspline, the gears have an oval shape. Flexspline is used as output and connected to the output flange.
NOTE: Although the steel Flexspline HCS-I series Harmonic Drive Reducer will bend during normal operation, there is no need to worry about fatigue failure. The resulting stress is well below the material's tolerance limit. Therefore, Flexspline will achieve a long life when used according to the catalog level.
Through the above introduction and analysis of the Gear of HCS-I series Harmonic Drive Reducer, hope it helps you.