CN220874359U - Electric motor water cooling structure and motor assembly - Google Patents

Abstract

The utility model provides a water cooling structure of an electric motor and a motor assembly, which relate to the technical field of related equipment of water-cooled motor shells. The utility model relieves the difficulty in demolding and sand removal of the cast and formed shell in the prior art and has low working efficiency; or the inner and outer shells are nested and formed, the process is complex, the cost is high, and the like.

Description

Electric motor water cooling structure and motor assembly

Technical Field

The utility model relates to the technical field of water-cooled motor shell related equipment, in particular to a water-cooled structure of an electric motor and a motor assembly.

Background

The lightweight automotive industry has long sought a breakthrough in technology. After entering the new energy era, the requirements of vehicle enterprises on light weight are more strict, and meanwhile, the requirements on the power density of the motor are also higher.

However, the higher power density of the motor generally causes serious temperature rise problems; therefore, in order to solve the temperature rising problem of the motor, the water-cooled motor is rapidly developed.

The water channel of the motor shell is generally in an integral casting mode, and the cast shell often has the defects of sand holes, air holes and the like due to the fact that the inside of the cast shell is provided with a complex water channel structure; meanwhile, the integrated molding has the defects of difficult demolding and sand discharge and low efficiency.

Another type of common water-cooling shell is a motor shell in which an inner shell and an outer shell are respectively cast and processed, and then the inner shell and the outer shell are matched with an assembled water channel, and the shell solves the problems of difficult demoulding, sand discharge and the like, but the two end surfaces of the inner shell and the outer shell need to be sealed in a friction welding mode; therefore, a welding process is added in the production process, and two sets of dies for the inner shell and the outer shell are needed, so that the material consumption is increased, and finally the production cost is increased.

Disclosure of utility model

The utility model aims to provide a water cooling structure of an electric motor and a motor assembly, which are used for relieving the difficulty in demolding and sand discharge of a cast molding shell in the prior art and have low working efficiency; or the inner and outer shells are nested and formed, the process is complex, the cost is high, and the like.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

In a first aspect, the utility model provides a water cooling structure of an electric motor, which comprises a motor shell structure, a front end cover and a rear end cover, wherein the motor shell structure is respectively connected with the front end cover and the rear end cover, the motor shell structure is used for being coated on the outer wall of an externally connected motor stator, a water passing channel is arranged in the motor shell structure, and water in the water passing channel is used for exchanging heat with the motor stator so as to cool the motor stator.

Further, the motor housing structure comprises a housing assembly, a front end cover and a rear end cover, one end of the housing assembly is connected with the front end cover, the other end of the housing assembly is connected with the rear end cover, the housing assembly is of an integrated structure, and the housing assembly, the front end cover and the rear end cover enclose to be used for accommodating the water passing channel.

Further, the shell assembly comprises an outer shell and an inner shell, wherein the outer shell is sleeved on the outer side of the inner shell, and the outer shell and the inner shell are both arranged between the front end cover and the rear end cover and are respectively connected with the front end cover and the rear end cover;

The inner shell is sleeved on the outer wall of the motor stator.

Further, the shell assembly further comprises a rib assembly, the rib assembly is arranged in the water passing channel, so that the water passing channel is of an S-shaped structure, and the rib assembly is respectively connected with the front end cover, the rear end cover, the outer shell and the inner shell.

Further, the rib assembly comprises a first rib, a plurality of second ribs and a plurality of third ribs, wherein the first rib, the second ribs and the third ribs are all connected with the outer shell and the inner shell, and the first rib is used for isolating the water passing channel along the motor shell structure extension line;

The second ribs and the third ribs are alternately distributed at intervals along the circumferential direction of the outer wall of the inner shell, and the second ribs are arranged at one end of the inner shell, which faces the front end cover, and are connected with the front end cover;

And the third ribs are arranged at one end of the inner shell, which faces the rear end cover, and are connected with the rear end cover.

Further, the motor shell structure further comprises a water inlet and outlet piece, the water inlet and outlet piece is connected with the outer shell, the water inlet and outlet piece is provided with a water inlet and a water outlet, and the water inlet and the water outlet are communicated with the water passing channel.

Further, one end of the motor shell structure is provided with a first annular groove along the circumferential direction of the outer wall of the motor shell structure, and the other end of the motor shell structure is provided with a second annular groove along the circumferential direction of the outer wall of the motor shell structure;

the water cooling structure of the electric motor further comprises at least two first sealing rings, wherein one first sealing ring is arranged in the first annular groove and is used for sealing the joint of the motor shell structure and the front end cover;

the other first sealing ring is arranged in the second annular groove and used for sealing the joint of the motor shell structure and the rear end cover.

Further, a third annular groove is formed in the front end cover along the circumferential direction of the inner wall of the connecting part of the front end cover;

The rear end cover is provided with a fourth annular groove along the circumferential direction of the inner wall of the connecting part of the rear end cover;

The water cooling structure of the electric motor further comprises at least two second sealing rings, wherein one second sealing ring is arranged in the third annular groove and is used for sealing the joint of the motor shell structure and the front end cover;

the other second sealing ring is arranged in the fourth annular groove and is used for sealing the joint of the motor shell structure and the rear end cover.

Further, a plurality of cooling fins are sequentially arranged on the outer wall of the outer shell along the circumferential direction of the outer wall.

In a second aspect, the present utility model provides a motor assembly comprising an electric motor water cooling structure as described in any one of the preceding embodiments.

The utility model can realize the following beneficial effects:

In a first aspect, the utility model provides a water cooling structure of an electric motor, comprising a motor shell structure, a front end cover and a rear end cover, wherein the motor shell structure is respectively connected with the front end cover and the rear end cover, the motor shell structure is used for being coated at the outer wall of an externally connected motor stator, a water passing channel is arranged in the motor shell structure, and water in the water passing channel is used for exchanging heat with the motor stator to cool the motor stator; the front end cover is used for being connected with an externally connected motor body; the rear end cover is used for being connected with the motor body.

In the utility model, the motor shell structure is connected with the motor body through the front end cover and the rear end cover, and is sleeved on the outer wall of the motor stator, and the cooling water flowing through the motor shell structure exchanges heat with the motor stator to realize the technical effect of cooling the motor stator.

Compared with the prior art, the water cooling structure of the electric motor provided by the utility model can realize heat exchange with the motor stator through the cooling water passing through the water passing channel inside the motor shell structure which is sleeved on the motor stator, so that the motor stator is cooled effectively.

In conclusion, the utility model at least relieves the difficulty in demolding and sand removal of the cast molding shell in the prior art, and has low working efficiency; or the inner and outer shells are nested and formed, the process is complex, the cost is high, and the like.

In addition, the second aspect of the utility model also provides a motor assembly, which comprises the water cooling structure of the electric motor provided by the first aspect; because the motor assembly provided by the utility model comprises the electric motor water cooling structure provided by the first aspect, the motor assembly provided by the utility model can achieve all the beneficial effects achieved by the electric motor water cooling structure provided by the first aspect.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a motor housing part of a water cooling structure of an electric motor according to an embodiment of the present utility model;

fig. 2 is a schematic cross-sectional view of a water cooling structure of an electric motor according to an embodiment of the present utility model in an installed state;

FIG. 3 is an enlarged schematic view of the portion A of FIG. 2;

Fig. 4 is a schematic perspective view of a water channel in a motor housing of a water cooling structure of an electric motor according to an embodiment of the present utility model.

Icon: 1-a motor housing structure; 11-an outer shell; 111-heat sinks; 12-rib assemblies; 121-first ribs; 122-second ribs; 123-third ribs; 13-an inner housing; 14-water inlet and outlet parts; 141-a water inlet; 142-water outlet; 15-a water passing channel; 151-water inlet end; 152-water outlet end; 2-a front end cover; 3-a rear end cover; 4-a first sealing ring; 5-a second sealing ring; 6-motor stator.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in place when the inventive product is used, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Example 1

The embodiment provides an electric motor water cooling structure, refer to fig. 1 or fig. 2, this electric motor water cooling structure includes motor housing structure 1, front end housing 2 and rear end housing 3, motor housing structure 1 is connected with front end housing 2 and rear end housing 3 respectively, motor housing structure 1 is used for the cladding to be equipped with water channel 15 in motor housing structure 1 in the outer wall department of external motor stator, water in the water channel 15 is used for with motor stator heat transfer so that motor stator cooling.

The embodiment of the utility model at least relieves the difficulty in demolding and sand removal of the cast and formed shell in the prior art, and has low working efficiency; or the inner and outer shells are nested and formed, the process is complex, the cost is high, and the like.

In the embodiment of the utility model, the motor shell structure 1 is connected with the motor stator 6 through the front end cover 2 and the rear end cover 3, the motor shell structure 1 is sleeved on the outer wall of the motor stator, and cooling water flowing through the motor shell structure exchanges heat with the motor stator to realize the technical effect of cooling the motor stator.

Compared with the prior art, the water cooling structure of the electric motor provided by the embodiment of the utility model can realize heat exchange with the motor stator through the cooling water passing through the water passing channel 15 in the motor shell structure 1 which is sleeved on the motor stator, so that the motor stator is cooled effectively.

In an alternative implementation manner of this embodiment, the motor housing structure 1 includes a housing assembly, a front end cover and a rear end cover, one end of the housing assembly is connected with the front end cover, the other end is connected with the rear end cover, and the housing assembly, the front end cover and the rear end cover enclose a water channel 15 for accommodating water.

Specific: the housing assembly is preferably of a circular tubular structure and is used for being sleeved on a motor stator, and the front end cover and the rear end cover are connected with two ends of the housing assembly, so that a water passing channel 15 arranged in the housing assembly is of a closed structure.

And preferably, the joint of the shell component and the front end cover and the rear end cover is coated with waterproof glue, so as to avoid water leakage at the joint of the shell component and the front end cover and the rear end cover.

Further, the shell assembly comprises an outer shell 11 and an inner shell 13, the outer shell 11 is sleeved on the outer side of the inner shell 13, and the outer shell 11 and the inner shell 13 are both arranged between the front end cover 2 and the rear end cover 3 and are respectively connected with the front end cover 2 and the rear end cover 3; the inner shell 13 is sleeved on the outer wall of the motor stator.

Specific: the outer shell 11 is sleeved on the outer side of the inner shell 13, and the outer shell 11 and the inner shell 13 are both arranged between the front end cover 2 and the rear end cover 3 and are respectively connected with the front end cover 2 and the rear end cover 3; the inner shell 13 is sleeved on the outer wall of the motor stator. Preferably, the outer shell 11 and the inner shell 13 may have a ring structure, and the outer shell 11 is sleeved outside the inner shell 13, and a gap is formed between the outer shell and the inner shell; and forms a closed space with the front end cover 2 and the rear end cover 3, namely, the closed space is a water channel 15.

Further, referring to fig. 1, the housing assembly further includes a rib assembly 12, the rib assembly 12 is disposed in the water channel 15, so that the water channel 15 presents an S-shaped structure, and the rib assembly 12 is respectively connected with the front end cover 2, the rear end cover 3 and the housing assembly.

Specific: the rib assembly 12 is arranged in the water passing channel 15, and the rib assembly 12 is respectively connected with the front end cover, the rear end cover, the outer shell 11 and the inner shell 13; preferably, the rib assembly 12 includes a plurality of ribs, and the ribs are equidistantly distributed between the outer housing 11 and the inner housing 13, and are used for supporting the outer housing 11 and the inner housing 13, and also for realizing fixed connection with the front end cover 2 and the rear end cover 3; importantly, the plurality of rib assemblies 12 provide the water passage 15 with an S-shaped configuration such that the cooling water may flow at a reduced rate as it passes through the water passage 15 of the S-shaped configuration for sufficient heat exchange with the motor stator 6.

Further, referring to fig. 1, the rib assembly 12 includes a first rib 121, a plurality of second ribs 122, and a plurality of third ribs 123, where the first rib 121, the second rib 122, and the third rib 123 are connected to the outer casing 11 and the inner casing 13, and the first rib 121 is used to partition the water channel 15 along the motor casing structure 1; the second ribs 122 and the third ribs 123 are alternately distributed at intervals along the circumferential direction of the outer wall of the inner shell 13, and the second ribs 122 are all arranged at one end of the inner shell 13 facing the front end cover and are connected with the front end cover; the third ribs 123 are all disposed at one end of the inner housing 13 facing the rear end cover and are connected to the rear end cover.

Specific: the first ribs 121 are used for isolating the water passage 15 from the line extending along the motor housing structure 1; the second ribs 122 and the third ribs 123 are alternately distributed at intervals along the circumferential direction of the outer wall of the inner shell 13, and the second ribs 122 are all arranged at one end of the inner shell 13 facing the front end cover and are connected with the front end cover; the third ribs 123 are all disposed at one end of the inner housing 13 facing the rear end cover and are connected to the rear end cover. Preferably, the first ribs 121 are disposed along the extending direction of the inner housing 13, and two ends of the first ribs are respectively connected with the front end cover and the rear end cover, so as to realize an annular space stage of enclosing the motor housing structure 1; the second ribs 122 and the third ribs 123 are provided with a plurality of second ribs 122 and are alternately distributed at intervals, the second ribs 122 are preferably the same as the third ribs 123 in length, and during distribution, one ends of all the second ribs 122 are connected with the front end cover, one ends of all the third ribs 123 are connected with the rear end cover, so that the stiff annular space is further modified into annular serpentine space, namely, the water passing channel 15 in reference to fig. 4 is formed.

In an alternative implementation manner of this embodiment, referring to fig. 1, the motor housing structure 1 further includes a water inlet and outlet member 14, the water inlet and outlet member 14 is connected to the outer housing 11, and the water inlet and outlet member 14 is provided with a water inlet 141 and a water outlet 142, and the water inlet 141 and the water outlet 142 are both communicated with the water channel 15.

Specific: the water inlet and outlet piece 14 is connected with the outer shell 11, the water inlet and outlet piece 14 is provided with a water inlet 141 and a water outlet 142, and the water inlet 141 and the water outlet 142 are communicated with the water channel 15; preferably, the water inlet 141 is located at one side of the first rib 121, and the water outlet 142 is located at the other side of the first rib 121, and in use, the water supply device injects cooling water from the water inlet 141 into the water inlet end 151 of the water channel 15, and the cooling water is discharged through the water outlet end 152 after passing through the water channel 15 to exchange heat with the motor stator.

In an alternative implementation manner of this embodiment, referring to fig. 2 or fig. 3, one end of the motor housing structure 1 is provided with a first annular groove along the circumferential direction of its outer wall, and the other end is provided with a second annular groove along the circumferential direction of its outer wall; the water cooling structure of the electric motor further comprises at least two first sealing rings 4, wherein one first sealing ring 4 is arranged in the first annular groove and is used for sealing the joint of the motor shell structure 1 and the front end cover 2; the other first sealing ring 4 is arranged in the second annular groove and is used for sealing the joint of the motor shell structure 1 and the rear end cover 3.

Specific: the outer walls at the two ends of the motor shell structure 1 are respectively provided with a first annular groove and a second annular groove along the circumferential direction, and the first sealing rings 4 are respectively arranged in the two annular grooves, so that when the motor shell structure 1 is respectively connected with the front end cover 2 and the rear end cover 3, the first sealing rings 4 at the two ends are respectively abutted with the front end cover 2 and the rear end cover 3, and the joint between the motor shell structure 1 and the front end cover 2 and the rear end cover 3 is sealed.

In an alternative implementation manner of this embodiment, referring to fig. 2 or fig. 3, the front end cover 2 is provided with a third annular groove along the circumferential direction of the inner wall of the connecting portion thereof; the rear end cover 3 is provided with a fourth annular groove along the circumferential direction of the inner wall of the connecting part; the water cooling structure of the electric motor further comprises at least two second sealing rings 5, wherein one second sealing ring 5 is arranged in the third annular groove and is used for sealing the joint of the motor shell structure 1 and the front end cover 2; the other second sealing ring 5 is arranged in the fourth annular groove and is used for sealing the joint of the motor shell structure 1 and the rear end cover 3.

Specific: the inside circumference of the connecting portion of front end housing 2 and motor housing structure 1 is equipped with the third annular groove, and the inside circumference of the connecting portion of rear end housing 3 and motor housing structure 1 is equipped with the fourth annular groove, and third annular groove is the same with fourth annular groove specification, and all is equipped with second sealing washer 5 in the two, and the second sealing washer 5 of both sides cooperatees with first sealing washer 4 to realize the junction double seal to motor housing structure 1 and front end housing 2 and rear end housing 3, improved the sealed effect of connection greatly.

Preferably, both ends of the motor housing structure 1 are coated with sealant, and the end faces of the front end cover 2 and the rear end cover 3 facing the motor housing structure 1 are also coated with sealant, so as to achieve the function of further improving the sealing effect.

In an alternative implementation of this embodiment, referring to fig. 1, a plurality of heat dissipation fins 111 are sequentially provided on the outer wall of the outer housing 11 along the circumferential direction thereof.

Specific: a plurality of heat radiating fins 111 are sequentially provided on the outer wall of the outer case 11 along the circumferential direction thereof; preferably, the plurality of cooling fins 111 are sequentially arranged on the outer wall of the outer housing 11, and the cooling effect is better by cooling the cooling fins 111 while cooling the cooling fins.

Example two

The present embodiment provides a motor assembly, including the water cooling structure of an electric motor provided in any one of the alternative embodiments of the first embodiment.

Because the motor assembly provided in this embodiment includes the water-cooling structure of the electric motor described in embodiment one, the motor assembly provided in this embodiment can achieve all the advantages achieved by the water-cooling structure of the electric motor in embodiment one, and the specific structure and the effects that can be achieved can be obtained by referring to each optional or preferred implementation mode in embodiment one.

Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are only required to be seen with each other; the above embodiments in the present specification are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The utility model provides an electricity motor water-cooling structure that rubs, its characterized in that, including motor housing structure (1), front end housing (2) and rear end cap (3), motor housing structure (1) respectively with front end housing (2) with rear end cap (3) are connected, motor housing structure (1) are used for the cladding to be in the outer wall department of external motor stator (6), be equipped with in motor housing structure (1) and cross water channel (15), cross water in water channel (15) be used for with motor stator (6) heat transfer so that motor stator (6) cooling.

2. The water cooling structure of an electric motor according to claim 1, wherein the motor housing structure (1) comprises a housing assembly, one end of the housing assembly is connected with the front end cover (2), the other end of the housing assembly is connected with the rear end cover (3), the housing assembly is in an integrally formed structure, and the housing assembly encloses with the front end cover (2) and the rear end cover (3) to be used for accommodating the water passing channel (15).

3. The water cooling structure of an electric motor according to claim 2, wherein the housing assembly comprises an outer housing (11) and an inner housing (13), the outer housing (11) is sleeved outside the inner housing (13), and the outer housing (11) and the inner housing (13) are both arranged between the front end cover (2) and the rear end cover (3) and are respectively connected with the front end cover (2) and the rear end cover (3);

the inner shell (13) is sleeved on the outer wall of the motor stator.

4. A water cooling structure of an electric motor according to claim 3, wherein the motor housing structure (1) further comprises a rib assembly (12), the rib assembly (12) is arranged in the water passing channel (15), so that the water passing channel (15) presents an S-shaped structure, and the rib assembly (12) is respectively connected with the front end cover (2), the rear end cover (3) and the housing assembly.

5. The electric motor water cooling structure according to claim 4, characterized in that the rib assembly (12) comprises a first rib (121), a plurality of second ribs (122) and a plurality of third ribs (123), the first rib (121), the second rib (122) and the third rib (123) are all connected with the outer housing (11) and the inner housing (13), and the first rib (121) is used for extending the water passage (15) along the motor housing structure (1) to be shielded from a line;

The second ribs (122) and the third ribs (123) are alternately distributed at intervals along the circumferential direction of the outer wall of the inner shell (13), and the second ribs (122) are all arranged at one end of the inner shell (13) facing the front end cover and are connected with the front end cover;

The third ribs (123) are all arranged at one end of the inner shell (13) facing the rear end cover and are connected with the rear end cover.

6. A water cooling structure of an electric motor according to claim 3, characterized in that the motor housing structure (1) further comprises a water inlet and outlet member (14), the water inlet and outlet member (14) is connected with the outer housing (11), the water inlet (141) and the water outlet (142) are formed in the water inlet and outlet member (14), and the water inlet (141) and the water outlet (142) are both communicated with the water passing channel (15).

7. The water cooling structure of an electric motor according to claim 2, wherein one end of the motor housing structure (1) is provided with a first annular groove along the circumferential direction of the outer wall thereof, and the other end is provided with a second annular groove along the circumferential direction of the outer wall thereof;

The water cooling structure of the electric motor further comprises at least two first sealing rings (4), wherein one first sealing ring (4) is arranged in the first annular groove and is used for sealing the joint of the motor shell structure (1) and the front end cover (2);

the other first sealing ring (4) is arranged in the second annular groove and is used for sealing the joint of the motor shell structure (1) and the rear end cover (3).

8. The water cooling structure of the electric motor according to claim 2, wherein the front end cover (2) is provided with a third annular groove along the circumferential direction of the inner wall of the connecting part;

The rear end cover (3) is provided with a fourth annular groove along the circumferential direction of the inner wall of the connecting part;

The water cooling structure of the electric motor further comprises at least two second sealing rings (5), wherein one second sealing ring (5) is arranged in the third annular groove and is used for sealing the joint of the motor shell structure (1) and the front end cover (2);

The other second sealing ring (5) is arranged in the fourth annular groove and is used for sealing the joint of the motor shell structure (1) and the rear end cover (3).

9. A water cooling structure of an electric motor according to claim 3, characterized in that a plurality of cooling fins (111) are provided on the outer wall of the outer housing (11) in sequence along the circumferential direction thereof.

10. An electric motor assembly comprising the electric motor water cooling structure of any one of claims 1 to 9.