US Patent 10533375 Multiple speed drill bit assembly

A drill bit may include rings that are rotatable at different speeds along a single axis. The drill bit may be coupled to a motor using multiple driveshafts. Each driveshaft can be coupled to one of the rings. Each driveshaft may transmit a different amount of torque from the motor to the rings to allow each ring to rotate at a different speed. In some aspects, the driveshafts may include a center driveshaft coupled to a pilot ring of the drill bit and an outer driveshaft coupled to an outer ring of the drill bit. The drill bit may include additional rings coupled to the motor by additional driveshafts.