US 12,273,011 B2
Electric motor shaft including inner helix pattern
Peter Rentfrow, Doylestown, OH (US); Eric Ubelhart, Orrville, OH (US); and Charles Clark, Clinton, OH (US)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Filed on Feb. 6, 2023, as Appl. No. 18/106,459.
Prior Publication US 2024/0266908 A1, Aug. 8, 2024
Int. Cl. H02K 7/00 (2006.01); H02K 9/19 (2006.01)
CPC H02K 7/003 (2013.01) [H02K 9/19 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An induction motor rotor shaft assembly for an induction motor, the induction motor rotor shaft assembly comprising:
an induction motor rotor shaft rotatable about a center axis, the induction motor rotor shaft including a hollow cylindrical base including an outer circumferential surface, an inner circumferential surface, a first axial end and a second axial end, the induction motor rotor shaft including helical structure extending about the center axis on or in the inner circumferential surface; and
a coolant supply for providing coolant inside of the hollow cylindrical base onto the helical structure for flow axially inside the hollow cylindrical base away from the first axial end and toward the second axial end along the helical structure as the induction motor rotor shaft rotates about the center axis.