Motor cooling structure, electric drive system and vehicle

Abstract

The utility model relates to a motor cooling structure, an electric drive system and a vehicle. The motor cooling structure comprises a motor shell, a stator is arranged in the motor shell, a rotor is arranged in the stator, one end of a rotating shaft of the rotor is hinged to a front end cover through a front bearing, the other end of the rotating shaft of the rotor is hinged to a rear end cover through a rear bearing, and the front end cover and the rear end cover are fixed to the front end and the rear end of the motor shell respectively; and a heat conduction sheath is arranged between the rear bearing and the rear end cover. The utility model also provides an electric drive system which comprises the motor cooling structure provided by the utility model. The utility model further provides a vehicle which comprises the electric drive system. According to the utility model, the heat dissipation capability of the cooling structure of the water-cooled motor on the bearing is effectively improved, and the heat dissipation capability of the stator and the winding is also effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water -cooled motor technical field, concretely relates to a motor cooling structure, electric drive system and vehicle. BACKGROUND

[0002] With the rapid development of new energy automobile industry, the core component "drive motor" of electric vehicle is also experiencing greater challenges. The power density demand of motor is increasing, and the higher heat generation and temperature field distribution non-uniformity follow. Excessive temperature will cause the performance of motor to decline, and in extreme cases, it will even cause the motor to burn; the non-uniformity of temperature field will produce thermal stress concentration in some areas of the motor, affect its structural stability, and in severe cases, it may cause structural failure, and thus directly affect the power performance of the vehicle.

[0003] In the prior art, the water-cooled motor cooling system of the electric drive system of the new energy vehicle mainly relies on the design of the embedded water channel in the shell. The cooling liquid flows in from one end and flows out from the other end to achieve heat dissipation of the motor. The existing water-cooled motor mainly improves the heat dissipation effect by improving the structure, shape and flow direction of the embedded water channel in the shell. Although this method can improve the heat dissipation capacity of the stator + winding part of the motor to a certain extent, it has very limited improvement on the heat dissipation of the rotor part, especially the bearing part. As one of the most easily damaged components in the motor, poor heat dissipation of the bearing will worsen the reliability of the bearing and shorten the service life of the bearing. SUMMARY

[0004] Therefore, the utility model aims at providing a motor cooling structure, electric drive system and vehicle to improve the heat dissipation capacity of the water-cooled motor cooling structure on the bearing and also improve the heat dissipation capacity of the stator + winding.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A motor cooling structure, comprising a motor shell, a stator is arranged in the motor shell, a rotor is arranged in the stator, one end of a rotating shaft of the rotor is hinged to a front end cover through a front bearing, the other end is hinged to a rear end cover through a rear bearing, and the front end cover and the rear end cover are fixed to the front end and the rear end of the motor shell respectively;

[0007] A heat-conducting sleeve is arranged between the rear bearing and the rear end cover.

[0008] Based on the aforementioned technical means, by installing a heat-conducting sleeve between the rear bearing and the rear end cover, the heat generated by the rear bearing can be rapidly conducted to the rear end cover, and then exchanged with the external environment through the rear end cover. This effectively reduces the temperature of the rear bearing, preventing bearing damage due to excessive temperature, thereby enhancing bearing reliability and further extending bearing life. It also improves the overall heat dissipation effect of the motor, ensuring stable motor operation, and thus enhancing the heat dissipation capacity of the water-cooled motor cooling structure for the bearing.

[0009] The motor cooling structure of this invention is particularly suitable for cooling water-cooled motors.

[0010] Preferably, the area of ​​the inner cavity wall of the thermally conductive sheath is larger than the area of ​​the outer wall of the rear bearing.

[0011] By setting the inner wall area of ​​the heat-conducting sleeve to be larger than the outer wall area of ​​the rear bearing, the heat-conducting sleeve can more comprehensively cover the rear bearing, increasing the contact area for heat conduction and improving heat conduction efficiency. This allows the heat generated by the rear bearing to be transferred away more quickly and effectively through the heat-conducting sleeve, thereby achieving effective cooling of the rear bearing. This extends the service life of the rear bearing and improves the overall performance and reliability of the motor.

[0012] Preferably, a limiting protrusion is formed on the outer wall of the heat-conducting sheath to cooperate with the limiting of the rear end cover.

[0013] By forming a limiting protrusion on the outer wall of the thermal conductive sleeve and achieving a limiting fit with the rear end cover, not only is the accurate positioning of the thermal conductive sleeve during installation ensured, but the stability and robustness of the structure are also greatly enhanced.

[0014] Preferably, the rear bearing and the thermally conductive sleeve are interference fit.

[0015] The interference fit between the rear bearing and the thermally conductive sleeve ensures a tight connection between them, effectively preventing loosening due to vibration or thermal expansion and improving the stability and reliability of the structure. At the same time, the interference fit also reduces thermal resistance during heat transfer, allowing the heat generated by the bearing to be dissipated more efficiently through the thermally conductive sleeve, thus enhancing the cooling effect.

[0016] Preferably, the thermally conductive sheath is made of aluminum alloy.

[0017] By using aluminum alloy to make the thermally conductive jacket, the excellent thermal conductivity and light weight of aluminum alloy are fully utilized. The high thermal conductivity of aluminum alloy allows for rapid heat transfer from the bearing to the surrounding environment, improving cooling efficiency. At the same time, the relatively light weight of aluminum alloy helps reduce the overall weight of the motor cooling structure, making the motor more energy-efficient and effective during operation.

[0018] Preferably, the front bearing is pressed and fixed to the front end cover by a heat-conducting pressure plate.

[0019] The front bearing is pressed and fixed to the front cover by a heat-conducting pressure plate, which not only ensures the stability and reliability of the front bearing, but also effectively improves the heat transfer efficiency.

[0020] Preferably, the front bearing and the front end cover are interference fit.

[0021] The front bearing and front cover are fitted with an interference fit, which further enhances the connection strength and stability between them. The interference fit reduces bearing loosening or displacement caused by vibration or external forces, thereby improving the smoothness and safety of motor operation. At the same time, the interference fit also helps improve heat transfer efficiency, as the tight contact surface reduces obstacles to heat transfer.

[0022] Preferably, a hollow cavity is formed inside the rotating shaft.

[0023] By designing the shaft with a hollow cavity structure, the heat transfer between the front and rear bearings of the shaft is effectively reduced. At the same time, the hollow cavity design effectively reduces the amount of raw materials used in the shaft, improves material utilization, and reduces production costs.

[0024] Furthermore, the hollow cavity design can also serve as a cooling medium flow channel, further improving cooling efficiency and flexibly adapting to the needs of different cooling media, such as water and oil, providing more options and possibilities for motor cooling. At the same time, this design also facilitates the replacement and maintenance of the cooling medium, improving the reliability and service life of the motor.

[0025] Preferably, the closest distance from the cavity wall of the hollow cavity to the rear end cover is less than the closest distance from the thermally conductive sheath to the rear end cover.

[0026] By designing the shortest distance from the cavity wall of the hollow cavity to the rear end cover to be smaller than the shortest distance from the thermally conductive sheath to the rear end cover, the heat transfer of the swivel shaft to the rear bearing is further reduced.

[0027] Preferably, the diameter of the hollow cavity is 1 / 2 of the outer diameter of the rotating shaft.

[0028] By designing the diameter of the hollow cavity to be half the outer diameter of the shaft, the strength of the shaft is effectively guaranteed while minimizing heat transfer, thus improving the overall performance of the motor.

[0029] Preferably, a cooling channel is formed inside the motor housing, and guide ribs are formed on the wall of the cooling channel.

[0030] By forming cooling channels within the motor housing, effective cooling of the motor's internal components is achieved. Furthermore, the formation of guide ribs on the walls of these cooling channels further enhances the cooling effect, thereby effectively improving the stator's heat dissipation capacity.

[0031] Preferably, the motor housing is provided with a coolant inlet and a coolant outlet connected to the cooling channel.

[0032] The cooling channels formed inside the motor housing are manufactured by extrusion molding, which simplifies the manufacturing process and saves on manufacturing costs.

[0033] This utility model also provides an electric drive system, including the motor cooling structure described in this utility model.

[0034] This utility model also provides a vehicle including the electric drive system described in this utility model.

[0035] The beneficial effects of this utility model are:

[0036] This utility model's motor cooling structure, by incorporating a heat-conducting sleeve between the rear bearing and the rear end cover, rapidly transfers heat generated by the rear bearing to the rear end cover. The heat is then exchanged with the external environment through the rear end cover, effectively reducing the rear bearing temperature and preventing bearing damage due to overheating. This enhances bearing reliability and extends bearing life. It improves the overall heat dissipation of the motor, ensuring stable operation and enhancing the heat dissipation capacity of the water-cooled motor cooling structure for the bearing. Furthermore, it boasts the advantages of simple structure and ease of implementation, making it valuable for widespread application in the field of water-cooled motor technology. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the motor cooling structure of this utility model;

[0038] Figure 2 This is a schematic diagram of the motor housing.

[0039] Figure 3 This is a magnified view of a portion of the motor housing;

[0040] Figure 4 This is a schematic diagram of the rotating shaft.

[0041] Figure 5 This is a cross-sectional view of the shaft;

[0042] Figure 6 This is a schematic diagram of the assembly of the front bearing and the heat-conducting pressure plate.

[0043] Figure 7 A schematic diagram of the front bearing and the heat-conducting pressure plate assembly from another angle;

[0044] Figure 8 A schematic diagram of the assembly of the rear bearing and the thermally conductive protective sleeve;

[0045] Among them, 1-motor housing, 11-cooling channel, 12-guide rib, 13-coolant inlet, 14-coolant outlet; 2-stator; 3-shaft, 31-hollow cavity; 4-front bearing; 5-front end cover; 6-rear bearing; 7-rear end cover; 8-heat-conducting sleeve, 81-limiting protrusion; 9-heat-conducting pressure plate. Detailed Implementation

[0046] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0047] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. Example

[0048] like Figures 1 to 8 As shown, a motor cooling structure includes a motor housing 1, a stator 2 inside the motor housing 1, a rotor inside the stator 2, one end of the rotor shaft 3 is hinged to the front end cover 5 via a front bearing 4, and the other end is hinged to the rear end cover 7 via a rear bearing 6. The front end cover 5 and the rear end cover 7 are respectively fixed to the front end and the rear end of the motor housing 1.

[0049] A heat-conducting sleeve 8 is provided between the rear bearing 6 and the rear end cover 7.

[0050] By incorporating a heat-conducting sleeve between the rear bearing and the rear end cover, the sleeve rapidly transfers heat generated by the rear bearing to the rear end cover. From there, heat exchange occurs between the rear end cover and the external environment, effectively reducing the rear bearing temperature and preventing damage due to overheating. This enhances bearing reliability and extends its lifespan. Furthermore, it improves the overall heat dissipation of the motor, ensuring stable operation and enhancing the heat dissipation capacity of the water-cooled motor's cooling structure for the bearing.

[0051] The above-mentioned motor cooling structure is particularly suitable for water-cooled motors.

[0052] In some embodiments, to allow the thermally conductive sleeve 8 to more fully cover the rear bearing 6, thereby increasing the contact area for heat conduction and improving heat conduction efficiency, the area of ​​the inner cavity wall of the thermally conductive sleeve 8 is set to be larger than the area of ​​the outer wall of the rear bearing 6. This design allows the heat generated by the rear bearing 6 to be transferred away more quickly and effectively through the thermally conductive sleeve 8, thereby achieving effective cooling of the rear bearing 6, extending the service life of the rear bearing, and improving the overall performance and reliability of the motor.

[0053] In some embodiments, to ensure accurate positioning of the thermally conductive sleeve 8 during installation and enhance structural stability and robustness, a limiting protrusion 81 is designed on the outer wall of the thermally conductive sleeve 8 to engage with the rear end cover 7. As a physical limiting device, the limiting protrusion 81 effectively prevents displacement or loosening of the thermally conductive sleeve 8 during use, thereby ensuring the continued effectiveness and reliability of the motor cooling structure. This feature is of great significance for improving the overall performance of the motor and extending its service life.

[0054] In some embodiments, to ensure a tight connection between the two and effectively prevent loosening due to vibration or thermal expansion, thereby improving the stability and reliability of the structure, the rear bearing 6 and the thermally conductive sleeve 8 are configured with an interference fit. The interference fit also reduces thermal resistance during heat transfer, allowing the heat generated by the bearing to be dissipated more efficiently through the thermally conductive sleeve, thus enhancing the cooling effect.

[0055] For example, the thermally conductive sleeve 8 is made of aluminum alloy. Aluminum alloy has a high thermal conductivity, which can quickly conduct the heat generated by the bearing to the surrounding environment, improving cooling efficiency. At the same time, aluminum alloy is relatively lightweight, which helps to reduce the weight of the entire motor cooling structure, making the motor more energy-efficient and effective during operation.

[0056] For example, the thermally conductive sheath 8 is made of aluminum alloy materials with good thermal conductivity, such as 6061 aluminum alloy and ADC12 aluminum alloy.

[0057] In some embodiments, to ensure the stability and reliability of the front bearing 4 and to improve heat transfer efficiency, a heat-conducting pressure plate 9 is provided to press and fix the front bearing 4 onto the front end cover 5. The heat-conducting pressure plate 9, as a medium for heat transfer, can quickly transfer the heat generated by the front bearing to the front end cover 5 or other heat dissipation structures, thereby contributing to the overall heat dissipation effect of the motor.

[0058] In some embodiments, to enhance the connection strength and stability between the front bearing 4 and the front end cover 5, the front bearing 4 and the front end cover 5 are configured with an interference fit. An interference fit can reduce bearing loosening or displacement caused by vibration or external forces, thereby improving the smoothness and safety of motor operation. Simultaneously, an interference fit also helps improve heat transfer efficiency, as the tight contact surface reduces obstacles to heat transfer.

[0059] In some embodiments, to reduce heat transfer between the front bearing 4 and the rear bearing 6 of the shaft 3, the shaft 3 is designed as a hollow cavity 31. Simultaneously, the hollow cavity 31 design effectively reduces the amount of raw material used in the shaft, improving material utilization and lowering production costs. Furthermore, the hollow cavity 31 can also serve as a cooling medium flow channel, further improving cooling efficiency and flexibly adapting to the needs of different cooling media, such as water and oil, providing more options and possibilities for motor cooling. This design also facilitates the replacement and maintenance of the cooling medium, improving the reliability and service life of the motor.

[0060] In some embodiments, in order to further reduce the heat transfer from the rotating shaft 3 to the rear bearing 6, the closest distance from the cavity wall of the hollow cavity 31 to the rear end cover 7 is set to be less than the closest distance from the thermally conductive sheath 8 to the rear end cover 7.

[0061] For example, in order to effectively ensure the strength of the shaft and improve the overall performance of the motor while minimizing heat transfer, the diameter of the hollow cavity 31 is set to be 1 / 2 of the outer diameter of the shaft 3.

[0062] In some embodiments, to achieve effective cooling of the motor's interior, a cooling channel 11 is formed within the motor housing 1, and guide ribs 12 are formed on the walls of the cooling channel 11. The design of the cooling channel 11 allows the coolant to flow smoothly through the motor's interior, carrying away the heat generated during motor operation, thereby ensuring the motor's normal operation and long-term stability. Simultaneously, the guide ribs guide the flow direction of the coolant, making the flow of coolant within the cooling channel 11 more uniform and sufficient, thus improving cooling efficiency. Furthermore, the guide ribs 12 increase the contact area between the coolant and the inner wall of the motor housing 1, further enhancing heat transfer and effectively improving the stator's heat dissipation capacity. This design offers advantages such as high cooling efficiency, simple structure, and ease of implementation, effectively solving the heat dissipation problem during motor operation and improving the motor's operational stability and service life.

[0063] For example, the motor housing 1 is provided with a coolant inlet 13 and a coolant outlet 14 connected to the cooling channel 11.

[0064] The cooling channel 11 formed inside the motor housing 1 is manufactured by extrusion molding, which is simple to manufacture and saves manufacturing costs.

[0065] In some embodiments, an electric drive system is also provided, including the motor cooling structure of any of the above embodiments.

[0066] In some embodiments, a vehicle is also provided, including the electric drive system of any of the above embodiments.

[0067] In summary, the motor cooling structure of this invention, by incorporating a heat-conducting sleeve between the rear bearing and the rear end cover, rapidly transfers the heat generated by the rear bearing to the rear end cover, thereby facilitating effective heat exchange between the rear end cover and the external environment. This design significantly reduces the temperature of the rear bearing, effectively preventing bearing damage caused by overheating, thus improving bearing reliability and extending its service life. Furthermore, this structure improves the overall heat dissipation performance of the motor, ensuring stable motor operation and enhancing the heat dissipation efficiency of the water-cooled motor cooling structure for the bearing. This design also boasts advantages such as simple structure and ease of implementation, making it valuable for widespread application in the field of water-cooled motor technology.

[0068] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A motor cooling structure, comprising a motor housing (1), wherein a stator (2) is disposed within the motor housing (1), and a rotor is disposed within the stator (2), characterized in that, One end of the rotor shaft (3) is hinged to the front end cover (5) via the front bearing (4), and the other end is hinged to the rear end cover (7) via the rear bearing (6). The front end cover (5) and the rear end cover (7) are respectively fixed to the front end and the rear end of the motor housing (1). A heat-conducting sleeve (8) is provided between the rear bearing (6) and the rear end cover (7).

2. The motor cooling structure according to claim 1, characterized in that, The area of ​​the inner cavity wall of the thermally conductive sheath (8) is greater than the area of ​​the outer wall of the rear bearing (6).

3. The motor cooling structure according to claim 1, characterized in that, The outer wall of the heat-conducting sheath (8) has a limiting protrusion (81) that is matched with the limiting protrusion of the rear end cover (7).

4. The motor cooling structure according to claim 1, characterized in that, The rear bearing (6) and the heat-conducting sleeve (8) are interference fit; And / or, the thermally conductive sheath (8) is made of aluminum alloy.

5. The motor cooling structure according to claim 1, characterized in that, The front bearing (4) is pressed and fixed onto the front end cover (5) by a heat-conducting pressure plate (9); And / or, the front bearing (4) and the front end cover (5) are interference fit.

6. The motor cooling structure according to claim 1, characterized in that, A hollow cavity (31) is formed inside the rotating shaft (3).

7. The motor cooling structure according to claim 6, characterized in that, The closest distance from the cavity wall of the hollow cavity (31) to the rear end cover (7) is less than the closest distance from the thermally conductive sheath (8) to the rear end cover (7); And / or, the diameter of the hollow cavity (31) is 1 / 2 of the outer diameter of the rotating shaft (3).

8. The motor cooling structure according to claim 1, characterized in that, A cooling channel (11) is formed inside the motor housing (1), and guide ribs (12) are formed on the wall of the cooling channel (11).

9. An electric drive system, characterized in that, Includes the motor cooling structure as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Including the electric drive system as described in claim 9.

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