Electrical axle drive for a vehicle

Patent metadata

Field	Value
Publication number	US-10933725-B2
Application number	US-201716310663-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
Priority date	Jun 17, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The present invention relates to an axle drive for a vehicle, said axle drive comprising at least one electrical machine, at least one power electronics system and at least one transmission, which are arranged in a housing, a first housing partition being situated between the at least one electrical machine and the at least one power electronics system. A further second housing partition is situated between the at least one electrical machine and the at least one transmission. The first housing partition consists of a first material, and/or the second housing partition consists of a second material.

First claim

The invention claimed is:

1. An axle drive ( 11 ) for a vehicle ( 10 ), said axle drive comprising at least one electrical machine ( 12 ), at least one power electronics system ( 13 ) and at least one transmission ( 14 ), which are arranged in a housing ( 15 ), wherein a first housing partition ( 16 ) is situated between the at least one electrical machine ( 12 ) and the at least one power electronics system ( 13 ), wherein a second housing partition ( 17 ) is situated between the at least one electrical machine ( 12 ) and the at least one transmission ( 14 ), wherein the first housing partition ( 16 ) is made of a first material (M1) configured to insulate the at least one power electronics system ( 13 ) from heat generated by the at least one electrical machine ( 12 ) to avoid unwanted heating of the at least one power electronics system ( 13 ) by waste heat from the at least one electrical machine ( 12 ), and the second housing partition ( 17 ) is made of a second material (M2) configured to facilitate heat exchange between the at least one electrical machine ( 12 ) and the at least one transmission ( 14 ) to heat the at least one transmission ( 14 ) with the waste heat from the at least one electrical machine ( 12 ) such that the at least one transmission ( 14 ) is used as a heat buffer, and wherein the second material (M2) is different from the first material (M1).

2. The axle drive ( 11 ) as claimed in claim 1 , wherein the first material (M1) of the first housing partition ( 16 ) is thermally insulating.

3. The axle drive ( 11 ) as claimed in claim 2 , wherein the second material (M2) of the second housing partition ( 17 ) has a very high thermal conductivity.

4. The axle drive ( 11 ) as claimed in claim 3 , wherein a third housing partition ( 18 ) made of a third material (M 3 ) is situated between the at least one transmission ( 14 ) and the at least one power electronics system ( 13 ).

5. The axle drive ( 11 ) as claimed in claim 4 , wherein the third material (M 3 ) of the third housing partition ( 18 ) is thermally insulating.

6. The axle drive ( 11 ) as claimed in claim 4 , wherein the third housing partition ( 18 ) is smooth on at least one side.

7. The axle drive ( 11 ) as claimed in claim 1 wherein the second material (M2) is made of copper or of a copper alloy.

8. The axle drive ( 11 ) as claimed in claim 1 , wherein the first housing partition ( 16 ) is smooth on at least one side.

9. The axle drive ( 11 ) as claimed in claim 1 , wherein the second housing partition ( 17 ) is rough on at least one side.

10. The axle drive ( 11 ) as claimed in claim 1 , wherein the second housing partition ( 17 ) has at least one cooling fin ( 19 ).

11. The axle drive ( 11 ) as claimed in claim 10 , wherein the surface of the cooling fin is rough.

12. The axle drive ( 11 ) as claimed in claim 1 , wherein one housing outer wall ( 20 ) is rough.

13. The axle drive ( 11 ) as claimed in claim 1 , wherein the housing outer wall ( 20 ) has at least one cooling fin ( 19 ).

14. The axle drive ( 11 ) as claimed in claim 1 , wherein the housing outer wall ( 20 ) is cooled by cooling air ( 21 ).

15. The axle drive ( 11 ) as claimed in claim 1 , wherein an interior region ( 22 ) of the housing ( 15 ) is cooled by cooling air ( 21 ).

16. The axle drive ( 11 ) as claimed in claim 1 , wherein a third housing partition ( 18 ) made of a third material (M3) is situated between the at least one transmission ( 14 ) and the at least one power electronics system ( 13 ).

17. The axle drive ( 11 ) as claimed in claim 16 , wherein the third material (M3) of the third housing partition ( 18 ) is thermally insulating.

18. An axle drive ( 11 ) for a vehicle ( 10 ), said axle drive comprising at least one electrical machine ( 12 ), at least one power electronics system ( 13 ) and at least one transmission ( 14 ), which are arranged in a housing ( 15 ), wherein a first housing partition ( 16 ) is situated between the at least one electrical machine ( 12 ) and the at least one power electronics system ( 13 ), wherein a second housing partition ( 17 ) is situated between the at least one electrical machine ( 12 ) and the at least one transmission ( 14 ), and wherein the first housing partition ( 16 ) is made of a first material (M1) configured to insulate the at least one power electronics system ( 13 ) from heat generated by the at least one electrical machine ( 12 ) to avoid unwanted heating of the at least one power electronics system ( 13 ) by waste heat from the at least one electrical machine ( 12 ), the second housing partition ( 17 ) is made of a second material (M2) configured to facilitate heat exchange between the at least one electrical machine ( 12 ) and the at least one transmission ( 14 ) to heat the at least one transmission ( 14 ) with the waste heat from the at least one electrical machine ( 12 ) such that the at least one transmission ( 14 ) is used as a heat buffer, the second material (M2) being different than the first material (M1), and the first material (M1) having a lower thermal conductivity than a material of the housing ( 15 ).

19. The axle drive ( 11 ) as claimed in claim 18 , wherein the first material (M1) of the first housing partition ( 16 ) is thermally insulating, wherein the first housing partition ( 16 ) includes at least one of an air chamber structure or a honeycomb sandwich structure.

20. The axle drive ( 11 ) as claimed in claim 18 , wherein the second material (M2) of the second housing partition ( 17 ) has a very high thermal conductivity.

Assignees

• Bosch Gmbh Robert

Inventors

• Ries-Mueller Klaus
• Eckert Bernd

Classifications

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title

• B60K11/06

  with air cooling · CPC title

• B60K2001/003

  with means for cooling the electrical propulsion units · CPC title

• B60Y2306/05

  Cooling · CPC title

• B60K1/00 Primary

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title