US Patent 10224798 Magnetic spiral bevel gear

A magnetic spiral bevel gear including a frustoconical housing with a rotational axis and magnets arranged around an outer surface of the frustoconical housing. The magnets are arranged in spirals on the outer surface, with each spiral alternating polarity. Each may be formed by a single continuous magnet of by discrete magnets. Gear assemblies as disclosed including a two-gear assembly, a four-gear assembly, and a six-gear assembly. Gear assemblies are arranged such that the gear surfaces are parallel without touching, and rotation of one gear causes rotation of the remaining gears.