SMRTR TechMar 11, 2026Daily.dev

3D Printing A Harmonic Pin-Ring Gearing Drive

SMRTR summary

Traditional cycloidal drives used in speed reduction require many components, but a newer harmonic pin-ring design used in TQ electric bicycles simplifies this to just two discs that work 180° out of sync to cancel wobble and create a more compact system. This strain wave gearing technology, originally patented in 1957 and famously used in NASA's Lunar Rover, is now gaining renewed attention for its efficiency and space-saving benefits.

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