Oil cooling system for electric machine, electric drive assembly system and vehicle

Patent metadata

Field	Value
Publication number	US-12556065-B2
Application number	US-202318456106-A
Country	US
Kind code	B2
Filing date	Aug 25, 2023
Priority date	Aug 25, 2022
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

An oil cooling system for an electric machine that includes a housing and a stator accommodated in the housing, the stator having a first end part and a second end part in an axial direction of the electric machine. The oil cooling system includes an oil inlet, for receiving external cooling oil; a first annular oil application pipe, located at the first end part and in fluid communication with the oil inlet; and a second annular oil application pipe, located at the second end part and in fluid communication with the oil inlet. An axial oil application part is located between the first end part and the second end part and formed by a housing inner wall and a stator outer wall. The axial oil application part receives cooling oil from at least one of the first annular oil application pipe and the second annular oil application pipe.

First claim

The invention claimed is:

1 . An oil cooling system for electric machine, the electric machine comprising a housing and a stator accommodated in the housing, the stator having a first end part and a second end part in an axial direction of the electric machine, the oil cooling system comprising:
an oil inlet, for receiving external cooling oil; a first annular oil application pipe, located at the first end part and in fluid communication with the oil inlet; a second annular oil application pipe, located at the second end part and in fluid communication with the oil inlet; an axial oil application part, located between the first end part and the second end part and formed by a housing inner wall and a stator outer wall, the axial oil application part receiving cooling oil from at least one of the first annular oil application pipe and the second annular oil application pipe, wherein the first annular oil application pipe is in fluid communication with the oil inlet via a first connecting pipeline formed by the housing inner wall, and the second annular oil application pipe is in fluid communication with the oil inlet via a second connecting pipeline formed by the housing inner wall.

2 . The oil cooling system according to claim 1 , wherein the first annular oil application pipe and the second annular oil application pipe are separate components.

3 . The oil cooling system according to claim 1 , wherein the first annular oil application pipe and the second annular oil application pipe are both provided with oil application holes.

4 . The oil cooling system according to claim 3 , wherein the oil application holes apply cooling oil to stator wire bundles at the first end part and the second end part.

5 . The oil cooling system according to claim 1 , wherein at least one of the first annular oil application pipe and the second annular oil application pipe has an opening for spraying oil towards the axial oil application part.

6 . The oil cooling system according to claim 1 , wherein at least one cooling channel is further formed between the housing inner wall and the stator outer wall, the at least one cooling channel being in fluid communication with the axial oil application part.

7 . The oil cooling system according to claim 6 , wherein the at least one cooling channel is a groove formed on the housing inner wall in a circumferential direction.

8 . The oil cooling system according to claim 6 , wherein the axial oil application part is disposed at an upper part of the at least one cooling channel in the direction of gravity.

9 . The oil cooling system according to claim 1 , wherein the oil cooling system further comprises an oil collection groove for collecting cooling oil, the oil collection groove having an oil outlet.

10 . The oil cooling system according to claim 5 , wherein at least one of the first annular oil application pipe and the second annular oil application pipe has at least one axially extending section, and the opening is provided on the axially extending section.

11 . The oil cooling system according to claim 1 , wherein an oil baffle is provided at least at the first end part.

12 . The oil cooling system according to claim 11 , wherein the oil baffle comprises:
a metal framework; and an elastic covering part.

13 . An electric drive assembly system comprising the oil cooling system for an electric machine according to claim 1 .

14 . A vehicle comprising the electric drive assembly system according to claim 13 .

15 . The oil cooling system according to claim 4 , wherein at least one cooling channel is further formed between the housing inner wall and the stator outer wall, the at least one cooling channel being in fluid communication with the axial oil application part.

16 . The oil cooling system according to claim 5 , wherein an oil baffle is provided at least at the first end part.

17 . An electric drive assembly system comprising the oil cooling system for an electric machine according to claim 2 .

18 . An electric drive assembly system comprising the oil cooling system for an electric machine according to claim 1 .

19 . An electric drive assembly system comprising the oil cooling system for an electric machine according to claim 3 .

20 . An oil cooling system for electric machine, the electric machine comprising a housing and a stator accommodated in the housing, the stator having a first end part and a second end part in an axial direction of the electric machine, the oil cooling system comprising:
an oil inlet, for receiving external cooling oil; a first annular oil application pipe, located at the first end part and in fluid communication with the oil inlet; a second annular oil application pipe, located at the second end part and in fluid communication with the oil inlet; an axial oil application part, located between the first end part and the second end part and formed by a housing inner wall and a stator outer wall, the axial oil application part receiving cooling oil from at least one of the first annular oil application pipe and the second annular oil application pipe, wherein an oil baffle is provided at least at the first end part.

Assignees

• Valeo Eautomotive Germany Gmbh

Inventors

• Zhang Shu
• Wang Wenhui
• Jin Yejin
• Zhao Wanchao
• Sun Yawei

Classifications

• H02K5/203 Primary

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

• 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

• B60K2001/006

  the electric motors · CPC title

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02K9/20

  wherein the cooling medium vaporises within the machine casing · CPC title