Power assembly and electric vehicle

Patent metadata

Field	Value
Publication number	US-12275296-B2
Application number	US-202217994630-A
Country	US
Kind code	B2
Filing date	Nov 28, 2022
Priority date	May 27, 2020
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

A power assembly includes a rotor iron core, a gear set, a rotating shaft, and an oil-pumping system. The rotating shaft is fixedly connected to the rotor iron core and a driving gear in the gear set. The housing has an oil storage pool at a bottom and an oil collection tank at a high location, a part of a structure of a first gear in the gear set is located in the oil storage pool, and the first gear rotates to drive cooling oil in the oil storage pool to be raised and collected by the oil collection tank. The rotating shaft has a cooling oil channel inside. The cooling oil in the oil collection tank flows to the cooling oil channel, to dissipate heat from the rotor iron core.

First claim

What is claimed is:

1. A power assembly, comprising:
a housing comprising an oil storage pool and an oil collection tank;
a rotor iron core;
a rotating shaft fixed to the rotor iron core and comprising a cooling oil channel, wherein the cooling oil channel comprises a sidewall at a first end and proximate to an oil inlet, wherein the sidewall comprises helical guiding channel, and wherein the helical guiding channel is configured to transfer cooling oil into the cooling oil channel along the helical guiding channel;
a first oil channel;
a gear set comprising:
a first gear having at least a portion located in the oil storage pool; and
a driving gear fixed to the rotating shaft; and

an oil-pumping system disposed in the housing and comprising an oil pump, wherein the oil pump comprises:
an oil inlet channel that communicates with the oil storage pool; and
an oil outlet channel coupled to the cooling oil channel, wherein the oil outlet channel comprises:
a second end that extends into the cooling oil channel; and
an outer wall spaced from the helical guiding channel by a uniform distance in a radial direction,

wherein the oil collection tank is located on a side that is of the rotating shaft and that is away from the oil storage pool,
wherein the oil collection tank is configured to collect the cooling oil from the oil storage pool when the gear set rotates,
wherein the oil collection tank communicates with the cooling oil channel using the first oil channel, and
wherein the first oil channel is configured to transfer the cooling oil in the oil collection tank to the cooling oil channel.

2. The power assembly of claim 1 , wherein the oil outlet channel is connected to the oil collection tank.

3. The power assembly of claim 1 , wherein the oil outlet channel is connected to the cooling oil channel.

4. The power assembly of claim 1 , wherein the oil outlet channel is connected to the first oil channel.

5. The power assembly of claim 1 , further comprising a flow valve disposed in the oil outlet channel and configured to adjust a flow of the cooling oil in the oil outlet channel.

6. The power assembly of claim 1 , wherein the oil-pumping system further comprises a heat exchanger disposed in the oil inlet channel or the oil outlet channel.

7. The power assembly of claim 1 , wherein the oil-pumping system further comprises a filter disposed in the oil inlet channel.

8. The power assembly of claim 1 , further comprising a flow guiding tank disposed between the oil collection tank and the first gear and configured to guide, to the oil collection tank, the cooling oil from the first gear.

9. The power assembly of claim 8 , wherein an outer wall surface that is of the oil collection tank and that faces the flow guiding tank is an arc-shaped surface.

10. The power assembly of claim 1 , wherein the helical guiding channel penetrates through the cooling oil channel.

11. The power assembly of claim 1 , further comprising a second oil channel coupled to the oil collection tank, wherein an oil outlet of the second oil channel is opposite to the gear set, and wherein the second oil channel is configured to transfer the cooling oil in the oil collection tank to the gear set in order to lubricate the gear set.

12. The power assembly of claim 11 , wherein the oil collection tank has a baffle that separates the oil collection tank into a plurality of oil areas.

13. The power assembly of claim 1 , further comprising a third oil channel coupled to the oil collection tank, wherein an oil outlet of the third oil channel is opposite to a bearing, and wherein the third oil channel is configured to transfer the cooling oil in the oil collection tank to the bearing in order to lubricate the gear set.

14. The power assembly of claim 1 , further comprising:
a stator iron core disposed in the housing, wherein the stator iron core has a cooling channel; and
a fourth oil channel, wherein the oil collection tank communicates with the cooling channel using the fourth oil channel, and wherein fourth oil channel is configured to transfer the cooling oil in the oil collection tank to the cooling channel.

15. An electric vehicle comprising:
a power assembly comprising:
a housing comprising an oil storage pool and an oil collection tank;
a rotor iron core;
a rotating shaft fixed to the rotor iron core and comprising a cooling oil channel, wherein the cooling oil channel comprises a sidewall at a first end and proximate to an oil inlet, wherein the sidewall comprises helical guiding channel, and wherein the helical guiding channel is configured to transfer cooling oil into the cooling oil channel along the helical guiding channel;
a first oil channel;
a gear set comprising:
a first gear having at least a portion located in the oil storage pool; and
a driving gear fixed to the rotating shaft; and

an oil-pumping system disposed in the housing and comprising an oil pump, wherein the oil pump comprises:
an oil inlet channel that communicates with the oil storage pool; and
an oil outlet channel coupled to the cooling oil channel, wherein the oil outlet channel comprises:
a second end that extends into the cooling oil channel; and
an outer wall spaced from the helical guiding channel by a uniform distance in a radial direction,

wherein the oil collection tank is located on a side that is of the rotating shaft and that is away from the oil storage pool,
wherein the oil collection tank is configured to collect the cooling oil brought out of the oil storage pool when the gear set rotates,
wherein the oil collection tank communicates with the cooling oil channel using the first oil channel, and
wherein first oil channel is configured to transfer the cooling oil in the oil collection tank to the cooling oil channel.

16. The electric vehicle of claim 15 , wherein the oil outlet channel is coupled to the oil collection tank.

17. The electric vehicle of claim 15 , wherein the oil outlet channel is coupled to the cooling oil channel.

18. The electric vehicle of claim 15 , wherein the oil outlet channel is coupled to the first oil channel.

19. The electric vehicle of claim 15 , wherein the helical guiding channel penetrates through the cooling oil channel.

20. The electric vehicle of claim 15 , wherein the power assembly further comprises a second oil channel coupled to the oil collection tank, wherein an oil outlet of the second oil channel is opposite to the gear set, and wherein the second oil channel is configured to transfer the cooling oil in the oil collection tank to the gear set in order to lubricate the gear set.

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Yang Shaobo
• Xu Haisong
• Wang Jiangang
• Chen Jun

Classifications

• B60K2001/006

  the electric motors · CPC title

• H02K5/203

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

• B60Y2306/03

  Lubrication · CPC title

• B60K2001/001

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