Liquid-cooled rotor for an electromechanical energy converter

Patent metadata

Field	Value
Publication number	US-12206293-B2
Application number	US-202117802028-A
Country	US
Kind code	B2
Filing date	Feb 24, 2021
Priority date	Mar 19, 2020
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A liquid-cooled rotor for an electromechanical energy converter has a rotor shaft designed, at least in portions, as a hollow shaft and having a first, open axial end, a liquid-guiding device extending through the first end into the rotor shaft, wherein an annular liquid space is between the liquid-guiding device and the rotor shaft in the radial direction, and the liquid-guiding device has an interior space for guiding liquid and a liquid inlet opening into the interior space and arranged at a first axial end of the liquid-guiding device, the liquid-guiding device, at a second axial end, is received in the rotor shaft and guiding relative to the rotor shaft, and has a liquid outlet opening fluidically connecting the interior space to the annular liquid space, and the liquid outlet opening is between the first and second ends of the liquid-guiding device in the axial direction.

First claim

The invention claimed is:

1. A liquid-cooled rotor for an electromechanical energy converter, wherein the liquid-cooled rotor is mounted rotatably about a rotor axis, and wherein the liquid-cooled rotor comprises:
a rotor shaft which is designed, at least in portions, as a hollow shaft and has a first, open axial end; and
a liquid-guiding device which extends through the first, open axial end into the rotor shaft,
wherein, in a radial direction, a liquid annulus space is formed between the liquid-guiding device and the rotor shaft, and
wherein the liquid-guiding device has an interior for guiding liquid and a liquid inlet opening in the interior, wherein the liquid inlet opening is arranged at a first axial end of the liquid-guiding device, wherein the liquid-guiding device is accommodated in the rotor shaft indirectly or directly at a second axial end, which is opposite the first axial end of the liquid-guiding device, and is thus guided relative to the rotor shaft,
wherein the liquid-guiding device has at least one liquid outlet opening through which the interior of the liquid-guiding device is fluidically connected to the liquid annulus space,
wherein the liquid outlet opening is arranged in an axial direction between the first and second ends of the liquid-guiding device,
wherein the liquid-guiding device has a liquid guide tube and an output shaft component,
wherein the liquid inlet opening is arranged at a first axial end of the output shaft component and the liquid guide tube is arranged at a second axial end of the output shaft component, and the liquid guide tube is received with a first axial end at the output shaft component,
wherein the at least one liquid outlet opening extends through a wall of the liquid guide tube,
wherein the output shaft component is received in the rotor shaft in a rotor connection region,
wherein, at least one liquid-guiding channel is arranged in the rotor connection region, by which the liquid annulus space is fluidically connected to an environment surrounding the liquid-cooled rotor
wherein the connection region has a torque transmission region and a centering region,
wherein the torque transmission region and the centering region are spaced apart from one another in the axial direction along the rotor axis, and
wherein the liquid-guiding channel in the centering region is designed as a recess on the rotor shaft or on the output shaft component.

2. The liquid-cooled rotor according to claim 1 , wherein the liquid guide tube is received with a second axial end of the liquid guide tube at the rotor shaft end piece.

3. An electromechanical energy converter comprising the liquid-cooled rotor according to claim 1 ,
wherein the electromechanical energy converter is mounted rotatably in a housing device,
wherein an energy converter rotor is connected to the rotor shaft for conjoint rotation,
wherein an output pinion is arranged on the liquid-cooled rotor,
wherein, in a normal installation position of the electromechanical energy converter, the output pinion meshes with a mating gear for power transmission, wherein the mating gear is surrounded, at least in portions in the radial direction, by a liquid collection portion of a liquid-supply device, and wherein the liquid collection portion is arranged such that at least one tangent to the mating gear in the liquid collection portion runs in a direction of the first axial end of the liquid-guiding device, and
wherein, in normal operation in a direction of rotation of the mating gear, liquid is conveyed by the mating gear from the liquid collection portion to the liquid inlet opening.

4. The electromechanical energy converter according to claim 3 , wherein a radially circumferential and radially inwardly projecting accumulation portion is formed at the liquid inlet opening.

5. The electromechanical energy converter according to claim 3 ,
wherein the liquid supply device has a liquid supply portion, and
wherein the liquid supply portion is designed as a raised portion on the liquid supply device and extends in the axial direction through the liquid inlet opening into the liquid-guiding device.

6. The electromechanical energy converter according to claim 5 , wherein the liquid supply portion extends in the axial direction beyond the accumulation portion into the interior of the liquid-guiding device.

7. An electromechanical energy converter comprising:
a liquid-cooled rotor for an electromechanical energy converter, wherein the liquid-cooled rotor is mounted rotatably about a rotor axis, and wherein the liquid-cooled rotor comprises:
a rotor shaft which is designed, at least in portions, as a hollow shaft and has a first, open axial end; and
a liquid-guiding device which extends through the first, open axial end into the rotor shaft,
wherein, in a radial direction, a liquid annulus space is formed between the liquid-guiding device and the rotor shaft, and
wherein the liquid-guiding device has an interior for guiding liquid and a liquid inlet opening in the interior, wherein the liquid inlet opening is arranged at a first axial end of the liquid-guiding device, wherein the liquid-guiding device is accommodated in the rotor shaft indirectly or directly at a second axial end, which is opposite the first axial end of the liquid-guiding device, and is thus guided relative to the rotor shaft,
wherein the liquid-guiding device has at least one liquid outlet opening through which the interior of the liquid-guiding device is fluidically connected to the liquid annulus space, and
wherein the liquid outlet opening is arranged in an axial direction between the first and second ends of the liquid-guiding device,
wherein the electromechanical energy converter is mounted rotatably in a housing device,
wherein an energy converter rotor is connected to the rotor shaft for conjoint rotation,
wherein an output pinion is arranged on the liquid-cooled rotor,
wherein, in a normal installation position of the electromechanical energy converter, the output pinion meshes with a mating gear for power transmission, wherein the mating gear is surrounded, at least in portions in the radial direction, by a liquid collection portion of a liquid-supply device, and wherein the liquid collection portion is arranged such that at least one tangent to the mating gear in the liquid collection portion runs in a direction of the first axial end of the liquid-guiding device, and
wherein, in normal operation in a direction of rotation of the mating gear, liquid is conveyed by the mating gear from the liquid collection portion to the liquid inlet opening.

8. The electromechanical energy converter according to claim 7 , wherein a radially circumferential and radially inwardly projecting accumulation portion is formed at the liquid inlet opening.

9. The electromechanical energy converter according to claim 7 ,
wherein the liquid supply device has a liquid supply portion, and
wherein the liquid supply portion is designed as a raised portion on the liquid supply device and extends in the axial direction through the liquid inlet opening into the liquid-guiding device.

10. The electromechanical energy converter according to claim 9 , wherein the liquid supply portion extends in the axial direction beyond the accumulation portion into the interior of the liquid-guiding device.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Krank Benjamin
• Puschmann Florian
• Strasinsky Simon
• Wolf Bernhard

Classifications

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K7/116

  with gears · CPC title

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K1/32 Primary

  with channels or ducts for flow of cooling medium · CPC title