Assembled hollow rotor shaft having a cooling-medium distribution element
An assembled hollow rotor shaft for a rotor, which rotates about a longitudinal axis, of an electric machine, may include a cylinder jacket that surrounds a shaft cavity, and end flanges disposed on both sides on the cylinder jacket. A shaft journal is disposed on each of the end flanges. An inlet is provided in the shaft journal of one of the end flanges via which a cooling medium can be conducted into the shaft cavity and onto an inner surface of the cylinder jacket. A cooling-medium distribution element within the shaft cavity may be formed symmetrically perpendicularly to the longitudinal axis, may receive the cooling medium, which enters via the inlet, via a receiving region, may guide the cooling medium via a removal region in a direction of the inner surface of the cylinder jacket, and may discharge the cooling medium onto the inner surface via a discharging region.
1. An assembled hollow rotor shaft for a rotor, which rotates about a longitudinal axis, of an electric machine, the assembled hollow rotor shaft comprising:
a cylinder jacket that surrounds a shaft cavity;
end flanges disposed on both sides of the cylinder jacket;
a shaft journal disposed on each of the end flanges;
an inlet disposed in the shaft journal of one of the end flanges, via which inlet a cooling medium can be conducted into the shaft cavity and onto an inner surface of the cylinder jacket; and
a cooling-medium distribution element disposed within the shaft cavity, the cooling-medium distribution element being symmetrical perpendicular to the longitudinal axis, wherein the cooling-medium distribution element is configured to receive the cooling medium, which enters via the inlet, via a receiving region, guide the cooling medium via a removal region in a direction of the inner surface of the cylinder jacket, and discharge the cooling medium onto the inner surface via a discharging regions;
wherein the cooling-medium distribution element has a spheroidal design at least in some sections; and
wherein the discharging region is disposed in the removal region halfway between the end flanges.
2. The assembled hollow rotor shaft of claim 1 wherein the cooling-medium distribution element symmetrically divides the shaft cavity.
3. The assembled hollow rotor shaft of claim 1 wherein the cooling-medium distribution element extends within the shaft cavity at least from a first of the end flanges to a second of the end flanges.
4. The assembled hollow rotor shaft of claim 1 wherein the cooling-medium distribution element comprises a mounting region by which the cooling-medium distribution element is mounted on the end flange disposed opposite the end flange with the shaft journal with the inlet.
5. The assembled hollow rotor shaft of claim 1 wherein the discharging region comprises a plurality of radial outlet openings that are disposed equidistant from one another over an extent of the cooling-medium distribution element.
6. The assembled hollow rotor shaft of claim 1 wherein an inner wall of the cooling-medium distribution element comprises a structure configured to distribute the cooling medium over of the cooling-medium distribution element.
7. The assembled hollow rotor shaft of claim 6 wherein the structure on the inner wall of the cooling-medium distribution element is convex.
8. The assembled hollow rotor shaft of claim 1 wherein the cylinder jacket comprises a passage opening that permits the cooling medium to flow in a radial direction as the hollow rotor shaft is rotating and that permits wetting of a stator surrounding the rotor.
9. The assembled hollow rotor shaft of claim 8 comprising a plurality of passage openings that are distributed equally over a circumference of the cylinder jacket.
10. The assembled hollow rotor shaft of claim 8 comprising passage openings disposed in a first edge region of the cylinder jacket, wherein the passage openings are offset with respect to one another over a circumference of the cylinder jacket relative to passage openings that are disposed in a second edge region of the cylinder jacket.
11. A rotor comprising a hollow rotor shaft, which is equipped with lamination assemblies, wherein the hollow rotor shaft comprises:
a cylinder jacket that surrounds a shaft cavity;
end flanges disposed on both sides of the cylinder jacket;
a shaft journal disposed on each of the end flanges;
an inlet disposed in the shaft journal of one of the end flanges, via which inlet a cooling medium can be conducted into the shaft cavity and onto an inner surface of the cylinder jacket; and
a cooling-medium distribution element disposed within the shaft cavity, the cooling-medium distribution element being symmetrical perpendicular to a longitudinal axis, wherein the cooling-medium distribution element is configured to receive the cooling medium, which enters via the inlet, via a receiving region, guide the cooling medium via a removal region in a direction of the inner surface of the cylinder jacket, and discharge the cooling medium onto the inner surface via a discharging region;
wherein the cooling-medium distribution element has a spheroidal design at least in some sections; and
the discharging region is disposed in the removal region halfway between the end flanges.
12. An electric machine comprising an asynchronous motor or a permanently excited synchronous machine, the electric machine comprising the rotor of claim 11 .