US 12,289,038 B2
Systems and methods for providing direct spray cooling in an electric motor
Louis Lambourg, Valenciennes (FR)
Assigned to DANA BELGIUM N.V., Bruges (BE)
Filed by Dana Belgium N.V., Flanders (BE)
Filed on Oct. 25, 2023, as Appl. No. 18/494,245.
Application 18/494,245 is a division of application No. 17/806,399, filed on Jun. 10, 2022, granted, now 11,881,757.
Application 17/806,399 is a division of application No. 16/807,857, filed on Mar. 3, 2020, granted, now 11,431,227, issued on Aug. 30, 2022.
Prior Publication US 2024/0072610 A1, Feb. 29, 2024
Int. Cl. H02K 9/19 (2006.01); H02K 1/276 (2022.01); H02K 1/30 (2006.01)
CPC H02K 9/19 (2013.01) [H02K 1/276 (2013.01); H02K 1/30 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A rotor assembly of an electric motor, comprising:
a shaft including an oil conduit extending axially therein and a plurality of openings fluidically coupling the oil conduit to an external surface of the shaft;
a rotor positioned coaxial with the shaft, an inner diameter of the rotor greater than an outer diameter of the shaft; and
a gas-filled chamber bounded by an inner surface of the rotor and the external surface of the shaft, the gas filled chamber fluidically coupled to the oil conduit via the plurality of openings, and a pressure of a gas in the gas-filled chamber lower than a pressure of oil in the oil conduit;
wherein, responsive to the pressure of the gas in the gas-filled chamber lower than the pressure of the oil in the oil conduit, oil sprays from the oil conduit into the gas filled chamber via the plurality of openings, the oil impinging on an internal surface of the rotor, the internal surface of the rotor including a plurality of rotor laminations, the plurality of rotor laminations is in direct contact with the oil sprays; and
wherein the rotor is fixedly coupled to a rotor hub extending axially therein, the rotor hub fixedly coupled to the shaft, and a greatest outer diameter of the rotor hub approximately equal to an inner diameter of the rotor, the greatest outer diameter extending through an axis of rotation of the shaft between positions having a maximum radial extent from the axis of rotation.