Electric machine

Patent metadata

Field	Value
Publication number	US-12009722-B2
Application number	US-201917276118-A
Country	US
Kind code	B2
Filing date	Jul 24, 2019
Priority date	Sep 13, 2018
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

An electric machine for a vehicle is disclosed. The electric machine includes a stator and a rotor rotatable relative to the stator about a rotational axis that defines an axial direction. A housing at least partially surrounds a housing interior and includes a first housing part and a second housing part that bound the housing interior. The rotor is rotatably mounted on the first housing part and the second housing part via a bearing device. At least one heat transmission body is arranged along the axial direction between at least one of the first and second housing parts and the rotor. The heat transmission body bounds, together with the at least one of the first and second housing parts, a coolant space through which a coolant can flow.

First claim

The invention claimed is:

1. An electric machine for a vehicle, comprising:
a stator and a rotor rotatable relative to the stator about a rotational axis that defines an axial direction,
a housing at least partially surrounding a housing interior, wherein the housing includes a first housing part and a second housing part that bound the housing interior, and the rotor is rotatably mounted on the first housing part and the second housing part via a bearing device,
at least one heat transmission body is arranged along the axial direction between at least one of the first housing part and the second housing part and the rotor, the at least one heat transmission body bounds, together with the at least one of the first housing part and the second housing part, a coolant space through which a coolant can flow,
wherein the bearing device comprises a first bearing element and a second bearing element that are arranged at an axial distance from one another, such that the rotor is arranged axially between the first bearing element and the second bearing element, and
wherein the axial position of the first bearing element and the second bearing element is defined such that that less than about 35% of the radial forces taken up by the first bearing element and the second bearing element are passed on to the at least one heat transmission body.

2. The machine as claimed in claim 1 , wherein the at least one heat transmission body is provided separately from the first housing part and the second housing part.

3. The machine as claimed in claim 1 , wherein at least one of:
the at least one heat transmission body and the first housing part and the second housing part are provided non-uniformly in respect of material,
a material of the at least one heat transmission body has a higher thermal conductivity than a material of at least one of the first housing part and the second housing part, and
a material of at least one of the first housing part and the second housing part has at least one of a higher upper yield strength and a higher creep limit than a material of the at least one heat transmission body.

4. The machine as claimed in claim 1 , wherein the at least one heat transmission body and the rotor comprise a heat transmission structure for transmitting heat from the rotor to the at least one heat transmission body.

5. The machine as claimed in claim 4 , wherein the heat transmission structure and the first housing part and the second housing part are provided non-uniformly in respect of material.

6. The machine as claimed in claim 4 , wherein a material of the heat transmission structure has a higher thermal conductivity than a material of at least one of the first housing part and the second housing part.

7. The machine as claimed in claim 4 , wherein the at least one heat transmission body and the heat transmission structure are provided uniformly in respect of material.

8. The machine as claimed in claim 4 , wherein the rotor is not mounted on the first housing part and the second housing part via the heat transmission structure or via the at least one heat transmission body.

9. The machine as claimed in claim 1 , wherein the rotor is mounted directly on the first housing part and the second housing part.

10. The machine as claimed in claim 1 , wherein a wall thickness, measured in the axial direction, of at least one of the first housing part and the second housing part is at least twice a wall thickness of the at least one heat transmission body.

11. The machine as claimed in claim 1 , wherein the at least one heat transmission body includes two heat transmission bodies bounding the coolant space,
wherein a first heat transmission body of the two heat transmission bodies is arranged along the axial direction between the first housing part and the rotor, and a second heat transmission body of the two heat transmission bodies is arranged along the axial direction between the rotor and the second housing part.

12. The machine as claimed in claim 1 , wherein the stator is attached to at least one of the first housing part and the second housing part.

13. The machine as claimed in claim 1 , wherein the stator is arranged at a distance from the at least one heat transmission body.

14. The machine as claimed in claim 1 , wherein one of:
the at least one heat transmission body is attached to the at least one of the first housing part and the second housing part; and
the at least one heat transmission body and the at least one of the first housing part and the second housing part are provided in one piece.

15. The machine as claimed in claim 1 , further comprising a heat transmission structure for transmitting waste heat from the rotor to the at least one heat transmission body, wherein the heat transmission structure comprises at least two projections that protrude axially from the rotor toward the at least one heat transmission body and engage in complementary recesses that are provided on the at least one heat transmission body.

16. The machine as claimed in claim 15 , wherein the at least two projections are structured as a comb.

17. The machine as claimed in claim 1 , further comprising a heat transmission structure for transmitting waste heat from the rotor to the at least one heat transmission body, wherein the heat transmission structure comprises at least two projections that protrude axially from the at least one heat transmission body to the rotor and engage in complementary recesses that are provided on the rotor.

18. The machine as claimed in claim 1 , further comprising a heat transmission structure for transmitting waste heat from the rotor to the at least one heat transmission body, wherein a distance, which is measured in a region of the heat transmission structure, between the at least one heat transmission body and the rotor along the axial direction, is at maximum 1 mm.

19. The machine as claimed in claim 1 , wherein the first housing part and the second housing part are composed of a different material than the at least one heat transmission body.

20. The machine as claimed in claim 1 , wherein a material of at least one of the first housing part and the second housing part has a thermal conductivity which is lower than a thermal conductivity of the at least one heat transmission body.

21. The machine as claimed in claim 1 , wherein a material of the at least one heat transmission body has a thermal conductivity of at least 100 W/(m*k).

22. The machine as claimed in claim 1 , wherein the housing further includes a third housing part formed radially limited and from plastic via encapsulation of the stator by injection molding.

23. The machine as claimed in claim 1 , wherein an annular gap, which is part of the coolant space, is provided between winding end sections that project into the coolant space.

24. An electric machine for a vehicle, comprising:
a stator and a rotor rotatable relative to the stator about a rotational axis that defines an axial direction,
a housing at least partially surrounding a housing interior, wherein the housing includes a first housing part and a second housing part that bound the housing interior, and the rotor is rotatably mounted on the first housing part and the second housing part via a bearing device,
at least one heat transmission body is arranged along the axial direction between at least one of the first housing part and the second housing part and the rotor, the at least one heat transmi

Assignees

• Mahle Int Gmbh

Inventors

• Sever Peter

Classifications

• H02K9/22

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K9/227 Primary

  Heat sinks · CPC title

• H02K5/18

  with ribs or fins for improving heat transfer · CPC title

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title