US 11,973,406 B2
Rotor and electric motor with such a rotor
Rayk Gersten, Friedrichshafen (DE); Stefan Spühler, Friedrichshafen (DE); David Wörzler, Langenargen (DE); Martin Christians, Friedrichshafen (DE); Martin Jelinewski, Nonnenhorn (DE); and Alexander Baur, Deggenhausertal (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Dec. 16, 2021, as Appl. No. 17/552,917.
Claims priority of application No. 10 2020 216 237.9 (DE), filed on Dec. 18, 2020.
Prior Publication US 2022/0200406 A1, Jun. 23, 2022
Int. Cl. H02K 9/197 (2006.01); H02K 1/276 (2022.01); H02K 1/32 (2006.01)
CPC H02K 9/197 (2013.01) [H02K 1/2766 (2013.01); H02K 1/32 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A rotor for an electric machine comprising:
a rotor support which is mounted to rotate about a rotational axis, which axis defines an axial direction and a radial direction that extends around the axial direction,
wherein the rotor support has a cylindrical inner shell facing toward the rotational axis and a cylindrical outer shell opposite the cylindrical inner shell,
a magnetic flux-carrying rotor component which the cylindrical outer shell supports,
the magnetic flux-carrying rotor component has a first end face at one axial end thereof and a second end face at an axially opposite end thereof,
a rotationally symmetrical shaft section, the rotationally symmetrical shaft section extends in the axial direction and the rotationally symmetrical shaft section is arranged in an inside space of the rotor support, and the rotationally symmetrical shaft section is mounted coaxially with the rotor support,
in a circumferential direction, at least in an area of the first end face, the cylindrical outer shell has radial first teeth, which radial first teeth face toward the magnetic flux-carrying rotor component, and a first tooth base between respective pairs of the radial first teeth,
in a circumferential direction, at least in an area of the second end face, the cylindrical outer shell has radial second teeth, which radial second teeth face toward the magnetic flux-carrying rotor component, and a second tooth base between respective pairs of the radial second teeth,
the rotationally symmetrical shaft section is designed to convey a fluid to the cylindrical inner shell of the rotor support,
first radial outlet openings are provided in the area of the first end face in the rotor support, which first radial outlet openings are arranged in each case in the first tooth base, and which are in the form of radial perforations in the rotor support,
the radial perforations are arranged uniformly in the circumferential direction of the rotor support so that when the rotor is rotating, the fluid emerges through the first radial outlet openings in the radial direction,
second radial outlet openings are provided in the area of the second end face in the rotor support, which second radial outlet openings are arranged in each case in the second tooth base, and which are in the form of further radial perforations in the rotor support, and
the further radial perforations are arranged uniformly in the circumferential direction of the rotor support so that when the rotor is rotating, the fluid emerges through the second radial outlet openings in the radial direction.