How does Hanwha make money?
A harmonic drive—also known as a strain wave gear—operates on the principles of elastic mechanics to achieve exceptionally high gear reduction ratios within a compact, lightweight mechanical package. The mechanism consists of three core components: a stationary outer ring gear with internal teeth called the circular spline, a flexible steel cup with external teeth called the flexspline, and an elliptical ball bearing assembly known as the wave generator inserted inside the flexspline. As the wave generator rotates, it deforms the flexible cup into an elliptical shape, causing its teeth to engage with the outer circular spline at two opposite points. Because the flexible cup has slightly fewer teeth than the outer ring, every complete rotation of the wave generator forces the flexible cup to slip backward by a precise number of teeth, producing massive torque multiplication and high-precision motion without backlash.
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