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Minimal Tooth Number of Flexspline in Harmonic Gear Drive with External Wave Generator - October 2013

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Archive > 2013 > October 2013 > Minimal Tooth Number of Flexspline in Harmonic Gear Drive with External Wave Generator

The article "Minimal Tooth Number of Flexspline in Harmonic Gear Drive with External Wave Generator" appeared in the October 2013 issue of Gear Technology.

Summary
Wave generators are located inside of flexsplines in most harmonic gear drive devices. Because the teeth on the wheel rim of the flexspline are distributed radially, there is a bigger stress concentration on the tooth root of the flexspline meshing with a circular spline, where a fatigue fracture is more likely to occur under the alternating force exerted by the wave generator. The authors' solution to this problem is to place the wave generator outside of the flexspline, which is a scheme named harmonic gear drive (HGD) with external wave generator (EWG).

Keywords
harmonic drive, flexspline, wave generator, harmonic gears, harmonic gear drives

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