CN220421565U

CN220421565U - Driving motor with cooling system

Info

Publication number: CN220421565U
Application number: CN202321914165.0U
Authority: CN
Inventors: 王艳坤; 何韬; 李乐
Original assignee: Suzhou Lvkon New Energy Technology Co ltd
Current assignee: Suzhou Lvkon New Energy Technology Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-01-30
Anticipated expiration: 2033-07-20

Abstract

The utility model relates to a drive motor with a cooling system, comprising: a shell provided with a cooling water channel; the first rotating shaft axially penetrates through the shell; the rotor is sleeved on the first rotating shaft; the balance plate assembly comprises a first balance plate and a second balance plate, and the first balance plate and the second balance plate are respectively arranged on two sides of the rotor; the stator is sleeved on the rotor; and an oil path passage provided to enter from the first shaft and pass through the first balance plate and the second balance plate to flow to a path of the stator. The utility model integrates an oil cooling system and a water cooling system to realize a composite cooling effect.

Description

Driving motor with cooling system

Technical Field

The utility model relates to the technical field of motors, in particular to a driving motor with a cooling system.

Background

The power limit capacity of the motor is often limited by the temperature rise limit of the motor, and the performance of the permanent magnet motor is reduced along with the temperature rise, so that the power density can be improved immediately by improving the cooling and heat dissipation capacity of the motor.

The existing new energy automobile motor cooling mode is mainly water-cooling, but has the problem that a heat source cannot be directly cooled, the heat dissipation efficiency is not ideal, and with the continuous development of an electric automobile, the power density of the motor is required to be continuously improved, so that an oil cooling technology with higher heat dissipation efficiency will be a trend.

For the existing oil cooling system, higher cost is required, in addition, some local excessive heat phenomenon can occur in the motor, and the oil path structure is complex and difficult to realize.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model discloses a driving motor with a cooling system.

The technical scheme adopted by the utility model is as follows:

a drive motor having a cooling system, comprising:

a housing;

the first rotating shaft axially penetrates through the shell;

the rotor is sleeved on the first rotating shaft;

the balance plate assembly comprises a first balance plate and a second balance plate, and the first balance plate and the second balance plate are respectively arranged on two sides of the rotor;

the stator is sleeved on the rotor;

and an oil path passage provided as a path that enters from the first shaft and flows to the stator through the first balance plate and the second balance plate.

A drive motor having a cooling system, comprising:

a shell provided with a cooling water channel;

the first rotating shaft axially penetrates through the shell;

the rotor is sleeved on the first rotating shaft;

the stator is sleeved on the rotor;

and an oil path passage provided as a path that enters from the first shaft, passes through the first balance plate and the second balance plate, and flows toward the stator.

In one embodiment of the utility model, the first rotating shaft comprises a first shaft body, and one end of the first shaft body is provided with a bearing end cover; a first oil hole is formed in one end of the first shaft body; the side wall of the first shaft body is provided with a second oil hole and a key groove, and the bearing end cover is provided with a third oil hole.

A drive motor having a cooling system, comprising:

a housing;

the second rotating shaft axially penetrates through the shell;

the shaft hub is sleeved on the second rotating shaft;

the rotor is sleeved on the shaft hub;

the stator is sleeved on the rotor;

and an oil path provided to be taken in by the second rotating shaft and to flow to the stator through the boss, the first balance plate and the second balance plate.

A drive motor having a cooling system, comprising:

a shell provided with a cooling water channel;

the second rotating shaft axially penetrates through the shell;

the shaft hub is sleeved on the second rotating shaft;

the rotor is sleeved on the shaft hub;

the stator is sleeved on the rotor;

In one embodiment of the present utility model, the second rotating shaft includes a second shaft body, and a fourth oil hole is formed at one end of the second shaft body; and a fifth oil hole and a sixth oil hole are formed in the side wall of the second shaft body.

In one embodiment of the utility model, two sides of the casing are respectively provided with an end cover, and an oil injection pipe is arranged in the end cover and is used for spraying the stator.

In one embodiment of the utility model, the oil injection pipe comprises an oil pipe, an oil inlet is formed in the oil pipe, a plurality of spraying holes are formed in the oil pipe, and the spraying holes are arranged towards the stator.

In one embodiment of the utility model, the tubing is arcuate in shape.

In one embodiment of the present utility model, the first balance plate and the second balance plate are annular plate bodies, and a plurality of oil passing channels are formed along the radial direction of the annular plate bodies.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. the oil cooling system and the water cooling system in the driving motor with the cooling system are highly integrated in a combined cooling way, so that the overall performance of the driving motor is improved, the volume of the driving motor is reduced, and the power density of the motor is greatly improved.

2. According to the driving motor with the cooling system, oil cooling spraying is realized in a mode of installing the oil spraying pipe in the end cover, so that stator slotting of a machine shell is avoided, and meanwhile, a complex oil collecting ring is omitted, so that the driving motor with the cooling system is simple and easy to realize.

3. The oil cooling system and the water cooling system in the driving motor with the cooling system can work simultaneously, and can also work independently, and the two cooling systems are mutually independent.

4. The oil cooling of the stator and the rotor in the driving motor with the cooling system can work simultaneously, and is suitable for a high-speed motor; the stator oil cooling device can also be used independently for stator oil cooling, and is suitable for low-speed motors.

5. The oil cooling circulation system in the driving motor with the cooling system has the advantages of simple structure, low processing difficulty coefficient, convenience in installation and higher operability.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.

Fig. 1 is a schematic view of a driving motor having a cooling system in the present utility model.

Fig. 2 is one of the sectional views of the driving motor having the cooling system in the present utility model.

Fig. 3 is a schematic diagram of the flow of cooling oil in fig. 2.

Fig. 4 is a schematic structural view of the first shaft in fig. 2.

Fig. 5 is a schematic structural view of a first balance plate in the present utility model.

Fig. 6 is a schematic structural view of a second balance plate according to the present utility model.

Fig. 7 is a schematic view of the structure of the first fuel injection pipe in the present utility model.

Fig. 8 is a schematic structural view of a second fuel injection pipe in the present utility model.

Fig. 9 is a second cross-sectional view of the drive motor with the cooling system of the present utility model.

Fig. 10 is a schematic diagram of the cooling oil flow in fig. 9.

Fig. 11 is a schematic structural view of the second shaft in fig. 9.

Fig. 12 is a schematic view of the structure of the hub of fig. 9.

Description of the specification reference numerals: 1. a driving motor; 2. a first end cap; 3. a housing; 401. a first rotating shaft; 4011. a first oil hole; 4012. a second oil hole; 4013. a third oil hole; 402. a second rotating shaft; 4021. a fourth oil hole; 4022. a fifth oil hole; 4023. a sixth oil hole; 501. a first oil passage; 502. a second oil passage; 503. a third oil passage; 504. a fourth oil passage; 505. a fifth oil passage; 506. a sixth oil passage; 507. a seventh oil passage; 508. an eighth oil passage; 6. a first balance plate; 601. a first oil passing hole; 602. a second oil passing hole; 7. a rotor; 8. a stator; 9. a first oil injection pipe; 901. a first oil inlet; 902. a first spray hole; 10. a junction box; 11. a cooling water channel; 12. the second oil injection pipe; 1201. a second oil inlet; 1202. a second spray hole; 13. a second balance plate; 1301. a third oil passing hole; 1302. a fourth oil passing hole; 14. a second end cap; 15. an oil outlet joint; 16. a hub; 1601. a fifth oil passing hole; 1602. a sixth oil passing hole; 1603. a seventh oil passing hole; 17. a first oil inlet joint; 18. a second oil inlet joint; 19. a cooling water joint; 20. and a third oil inlet joint.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

With respect to the foregoing and other features, aspects and advantages of the utility model, they will become apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the utility model, and furthermore, like reference numerals refer to like elements throughout the embodiments.

Example 1:

referring to fig. 1 and 2, a driving motor having a cooling system, comprising:

a housing 3;

the first rotating shaft 401 axially penetrates through the casing 3, a first oil duct 501 is formed along the axial direction of the first rotating shaft 401, and a second oil duct 502 communicated with the first oil duct 501 is formed along the radial direction of the first rotating shaft 401; the outer wall of the first rotating shaft 401 is provided with a third oil passage 503, and the third oil passage 503 is communicated with the second oil passage 502.

A rotor 7 sleeved on the first rotating shaft 401;

the balance plate assembly comprises a first balance plate 6 and a second balance plate 13, and the first balance plate 6 and the second balance plate 13 are respectively arranged on two sides of the rotor 7; the first balance plate 6 and the second balance plate 13 are provided with oil holes communicated with the third oil duct 503;

and the stator 8 is sleeved on the rotor 7.

The first rotating shaft 401 comprises a first shaft body, and a bearing end cover is arranged at one end of the first shaft body; one end of the first shaft body is provided with a first oil hole 4011; the side wall of the first shaft body is provided with a second oil hole 4012 and a key groove, and the bearing end cover is provided with a third oil hole 4013. The two ends of the first shaft body are respectively provided with a step shaft, and the number of steps is reduced as much as possible from the aspects of material utilization and processing man-hour. The first rotating shaft 401 can bear the rotating force and the radial force of the first shaft body, and the stability and the running stability of the first shaft body are guaranteed.

An oil seal is arranged at the oil inlet of the rotor 7 to prevent cooling oil from entering the cavity of the driving motor 1, ensure oil inlet pressure, realize the oil inlet function of the rotor 7 and simultaneously prevent the risk of mutual friction between the oil inlet and the rotor 7.

The both sides of casing 3 are equipped with first end cover 2 and second end cover 14 respectively, are equipped with first injection pipe 9 in the first end cover 2, are equipped with second injection pipe 12 in the second end cover 14, and first injection pipe 9 and second injection pipe 12 all are set up to spray cooling to stator 8. In addition, the casing 3 is further provided with a junction box 10, and the junction box 10 is convenient for the safety of the connection of the product and the power supply connector and performs necessary protection on the motor body.

The first end cap 2 is provided with a first oil inlet joint 17 and a second oil inlet joint 18, the second end cap 14 is provided with a third oil inlet joint 20, and the first oil inlet joint 17 is connected with the first oil hole 4011. The housing 3 is also provided with an oil outlet joint 15. The third oil inlet joint 20 of the second end cover 14 and the oil outlet joint 15 at the bottom of the casing 3 are connected and converged by utilizing an oil cavity, or can be connected and converged by adopting a three-way joint, so that the connection of an oil pump or an oil cooler is facilitated.

Further, there are two oil outlet connectors 15, and two oil outlet connectors 15 are respectively arranged at two sides of the stator 8, so that liquid accumulation at two sides of the interior of the casing 3 is prevented, and oil stirring loss is prevented from occurring due to no air gap.

Specifically, as shown in fig. 7, the first oil spray pipe 9 includes an arc-shaped first oil pipe, the first oil pipe is provided with a first oil inlet 901, the second oil inlet joint 18 is connected to the first oil inlet 901, and the first oil pipe is provided with a plurality of first spray holes 902, and the plurality of first spray holes 902 are provided toward the stator 8. Preferably, a plurality of first spraying holes 902 are uniformly distributed along the circumferential direction of the first oil pipe, so that sufficient coverage area is ensured, and the structure is simple and the installation is convenient.

As shown in fig. 8, the second oil spray pipe 12 includes a second oil pipe provided with a second oil inlet 1201, the third oil inlet joint 20 is connected to the second oil inlet 1201, and the second oil pipe is provided with a plurality of second spray holes 1202, and the plurality of second spray holes 1202 are disposed toward the stator 8. Preferably, a plurality of second spraying holes 1202 are uniformly distributed along the circumferential direction of the second oil pipe, so that sufficient coverage area is ensured, and the structure is simple and the installation is convenient.

It should be noted that, the first oil injection pipe 9 and the second oil injection pipe 12 may be installed inside the end cover through connection modes such as interference fit, press riveting, and fastening; further, according to the installation environment of the drive motor 1, the first oil inlet 901 is provided perpendicular to the first oil pipe, and the second oil inlet 1201 protrudes in the radial direction of the second oil pipe. Further, it is understood that the first oil jet pipe 9 and the second oil jet pipe 12 are in a state of being disposed opposite to each other.

Compared with the existing oil cooling scheme that an oil guide groove is formed in the surface of a stator, the stator punching sheet is required to be provided with 2-3 pairs of dies, so that the manufacturing cost is increased, the first oil injection pipe 9 and the second oil injection pipe 12 are designed in the embodiment, the stator of the machine shell 3 can be prevented from being grooved, and meanwhile, the complex oil collecting ring is omitted, and the method is simple and easy to realize.

As shown in fig. 5, the first balance plate 6 is an annular plate body, the first rotation shaft 401 passes through an annular channel of the first balance plate 6, a first oil passing hole 601 is formed in the inner wall of the first balance plate 6, a second oil passing hole 602 is formed in the outer wall of the first balance plate 6, and the first oil passing hole 601 and the second oil passing hole 602 are mutually communicated to form an oil passing channel. Further, in order to better adapt to the structural form of the first rotating shaft 401, the inner wall of the first balance plate 6 is provided with a first step, and the first step is used for being clamped to the first rotating shaft 401.

As shown in fig. 6, the second balance plate 13 is an annular plate body, the first rotating shaft 401 passes through an annular channel of the second balance plate 13, a third oil passing hole 1301 is formed in the inner wall of the second balance plate 13, a fourth oil passing hole 1302 is formed in the outer wall of the second balance plate 13, and the third oil passing hole 1301 and the fourth oil passing hole 1302 are communicated with each other to form an oil passing channel. Likewise, in order to better adapt to the structural form of the first rotating shaft 401, the inner wall of the second balancing plate 13 is provided with a second step, and the second step is used for being clamped to the first rotating shaft 401.

It should be noted that the first oil passing hole 601 and the second oil passing hole 602 may be one or more, and the third oil passing hole 1301 and the fourth oil passing hole 1302 may be one or more, so long as the number of the first oil passing holes 601 and the number of the second oil passing holes 602 are the same. The number of the third oil passing holes 1301 may be the same as the number of the fourth oil passing holes 1302.

The oil passage is preferably straight, but of course, the oil passage can also be designed as a curve.

As shown in fig. 3, the working principle of the present utility model is as follows:

after cooling oil enters the first oil inlet joint 17 and the third oil inlet joint 20 into the first oil injection pipe 9 and the second oil injection pipe 12 respectively, the end part or other designated positions of the stator 8 are sprayed by using the first spraying holes 902 and the second spraying holes 1202, so that a heat dissipation function is realized.

And, the cooling oil enters the first oil passage 501 of the first shaft 401 from the second oil inlet joint 18, and flows through the second oil passage 502 and the third oil passage 503 in this order. The first balance plate 6 and the second balance plate 13 are respectively provided with oil passing holes, the oil passing holes of the first balance plate 6 and the oil passing holes of the second balance plate 13 form a cooling oil channel, and cooling oil enters the oil passing holes of the first balance plate 6 and the oil passing holes of the second balance plate 13 from the third oil duct 503 to spray the inner side of a coil of the stator 8 so as to achieve a heat dissipation effect.

The cooling oil entering the inside of the driving motor 1 flows out of the driving motor 1 through an oil outlet joint 15 at the bottom of the driving motor 1, so that the cooling oil is circulated.

Example 2:

the difference from embodiment 1 is that the housing 3 is provided with a cooling water channel 11, and the housing 3 is provided with a cooling water joint 19, and the cooling water joint 19 is used for realizing the inlet and outlet of cooling water, thereby realizing the circulation of a water cooling system. Further, there are a plurality of cooling water passages 11, and the plurality of cooling water passages 11 are spirally arranged along the circumferential direction of the casing 3. In the embodiment, an oil cooling system and a water cooling system are integrated, so that a composite cooling effect is realized.

Example 3:

in connection with fig. 1 and 9, the difference from embodiment 1 is that the drive motor is provided with a hub. That is to say,

a drive motor having a cooling system, comprising:

a housing 3;

the second rotating shaft 402 axially passes through the casing 3, a fourth oil duct 504 is formed along the axial direction of the second rotating shaft 402, and a fifth oil duct 505 communicated with the fourth oil duct 504 is formed along the radial direction of the second rotating shaft 402;

a hub 16 sleeved on the second rotating shaft 402; hub 16 is provided with a seventh oil passage 507 in communication with fifth oil passage 505;

the rotor 7 is sleeved on the shaft hub 16;

the balance plate assembly comprises a first balance plate 6 and a second balance plate 13, and the first balance plate 6 and the second balance plate 13 are respectively arranged on two sides of the rotor 7; the first balance plate 6 and the second balance plate 13 are provided with an eighth oil passage 508, and the eighth oil passage 508 overflows the cooling oil of the seventh oil passage 507;

and the stator 8 is sleeved on the rotor 7.

The second rotating shaft 402 includes a second shaft body, and a fourth oil hole 4021 is formed at one end of the second shaft body; the second shaft body has a fifth oil hole 4022 and a sixth oil hole 4023 provided in a side wall thereof. The two ends of the second shaft body are respectively provided with a step shaft, and the number of steps is reduced as much as possible from the aspects of material utilization and processing time. The second rotating shaft 402 can bear the rotating force and the radial force of the first shaft body, and the stability and the running stability of the second shaft body are guaranteed.

Further, the second rotating shaft 402 is further provided with a sixth oil duct 506, and a central axis of the sixth oil duct 506 and a central axis of the fourth oil duct 504 are arranged at an included angle, that is, the sixth oil duct 506 is arranged obliquely, so that cooling oil dissipates heat and lubricates a bearing of the driving motor 1, and the cooling oil enters a central position of the second rotating shaft 402.

The inner wall of the hub 16 is provided with a fifth oil passing hole 1601, the outer wall of the hub 16 is provided with a sixth oil passing hole 1602, and the end of the hub 16 is provided with a seventh oil passing hole 1603.

An oil seal is arranged at the oil inlet of the rotor 7, so that cooling oil is prevented from entering the cavity of the driving motor 1, the oil inlet pressure is ensured, the oil inlet function of the rotor 7 is realized, and the risk of mutual friction between the oil inlet and the rotor is prevented.

Specifically, as shown in fig. 7, the first oil spray pipe 9 includes an arc-shaped first oil pipe, the first oil pipe is provided with a first oil inlet 901, the second oil inlet joint 18 is connected to the first oil inlet 901, and the first oil pipe is provided with a plurality of first spray holes 902, and the plurality of first spray holes 902 are provided toward the stator 8. Preferably, the plurality of first spraying holes 902 are uniformly distributed along the circumferential direction of the first oil pipe.

As shown in fig. 8, the second oil spray pipe 12 includes a second oil pipe provided with a second oil inlet 1201, the third oil inlet joint 20 is connected to the second oil inlet 1201, and the second oil pipe is provided with a plurality of second spray holes 1202, and the plurality of second spray holes 1202 are disposed toward the stator 8. Preferably, the plurality of second spraying holes 1202 are uniformly distributed along the circumferential direction of the second oil pipe.

The oil passage is preferably straight, so that the problem that the inclined hole is difficult to process is avoided, and the oil passage can be designed into a curve.

As shown in fig. 10, the working principle of the present utility model is as follows:

And, the cooling oil enters the fourth oil passage 504 of the second rotary shaft 402 from the second oil inlet joint 18, and flows through the fifth oil passage 505, the sixth oil passage 506, and the seventh oil passage 507 in this order. The first balance plate 6 and the second balance plate 13 are respectively provided with oil passing holes, the oil passing holes of the first balance plate 6 and the oil passing holes of the second balance plate 13 form a cooling oil channel, and cooling oil enters the oil passing holes of the first balance plate 6 and the oil passing holes of the second balance plate 13 from the seventh oil duct 507 to spray the inner side of a coil of the stator 8 so as to achieve a heat dissipation effect.

Compared with embodiment 1, the driving motor provided in embodiment 1 omits the fifth oil passing hole 1601, the sixth oil passing hole 1602 and the seventh oil passing hole 1603, which are small oil passage holes machined in the hub 16, and has a relatively simple oil passage structure, a reduced cost, and simplicity and easiness in implementation.

Example 4:

the difference from embodiment 3 is that the housing 3 is provided with a cooling water passage 11, and the housing 3 is provided with a cooling water joint 19, and cooling water is introduced through the cooling water joint 19. Further, there are a plurality of cooling water passages 11, which are spirally arranged along the circumferential direction of the casing 3. In the embodiment, an oil cooling system and a water cooling system are integrated, so that a composite cooling effect is realized.

The utility model also provides a vehicle, which comprises the driving motor 1 with the cooling system of the oil-water composite cooling system provided by any one of the embodiments 1-4.

The main design key point of the utility model is the structural improvement of the driving motor, and other structures of the vehicle, such as an electric connection part and a mechanical structure part of the vehicle are not described in detail.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should 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.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims

1. A drive motor having a cooling system, comprising:

a housing (3);

a first rotation shaft (401) passing axially through the housing (3);

a rotor (7) sleeved on the first rotating shaft (401);

the balance plate assembly comprises a first balance plate (6) and a second balance plate (13), wherein the first balance plate (6) and the second balance plate (13) are respectively arranged on two sides of the rotor (7);

a stator (8) sleeved on the rotor (7);

an oil passage is provided as a path which is entered from the first rotating shaft (401) and flows to the stator (8) through the first balance plate (6) and the second balance plate (13).

2. A drive motor having a cooling system, comprising:

a casing (3) provided with a cooling water channel (11);

a first rotation shaft (401) passing axially through the housing (3);

a rotor (7) sleeved on the first rotating shaft (401);

a stator (8) sleeved on the rotor (7);

3. The drive motor with a cooling system according to claim 1 or 2, characterized in that the first shaft (401) comprises a first shaft body, one end of which is provided with a bearing end cap; a first oil hole (4011) is formed in one end of the first shaft body; the side wall of the first shaft body is provided with a second oil hole (4012) and a key groove, and the bearing end cover is provided with a third oil hole (4013).

4. A drive motor having a cooling system, comprising:

a housing (3);

a second rotating shaft (402) axially penetrating the casing (3);

a hub (16) sleeved on the second rotating shaft (402);

a rotor (7) sleeved on the shaft hub (16);

a stator (8) sleeved on the rotor (7);

an oil passage is provided as a path that is entered by the second rotating shaft (402) and flows to the stator (8) through the boss (16), the first balance plate (6), and the second balance plate (13).

5. A drive motor having a cooling system, comprising:

a casing (3) provided with a cooling water channel (11);

a second rotating shaft (402) axially penetrating the casing (3);

a hub (16) sleeved on the second rotating shaft (402);

a rotor (7) sleeved on the shaft hub (16);

a stator (8) sleeved on the rotor (7);

6. The drive motor with a cooling system according to claim 4 or 5, characterized in that the second rotating shaft (402) comprises a second shaft body, one end of which is provided with a fourth oil hole (4021); the side wall of the second shaft body is provided with a fifth oil hole (4022) and a sixth oil hole (4023).

7. Drive motor with a cooling system according to any of claims 1, 2, 4 and 5, characterized in that the two sides of the housing (3) are provided with end caps, respectively, in which end caps are provided oil spray pipes, which are arranged to spray the stator (8).

8. The drive motor with a cooling system according to claim 7, characterized in that the oil injection pipe comprises an oil pipe, which is provided with an oil inlet, and which is provided with a plurality of spray holes, which are arranged towards the stator (8).

9. The drive motor with a cooling system according to claim 8, wherein the oil pipe is arc-shaped.

10. The drive motor with a cooling system according to any one of claims 1, 2, 4 and 5, characterized in that the first balancing plate (6) and the second balancing plate (13) are annular plate bodies, and a plurality of oil passing channels are formed along the radial direction of the annular plate bodies.