Motor thermal management system

Abstract

The motor thermal management system comprises a motor, a gearbox and a heat dissipation unit, the motor comprises an end cover and an output rotating shaft, the side, facing the motor, of the end cover is the inner side, the side, facing the gearbox, of the end cover is the outer side, a through hole is formed in the center of the end cover, and the output rotating shaft extends out of the through hole; the gearbox and the motor are separated by the end cover; the heat dissipation unit comprises a heat conduction module arranged on the end cover, heat generated in the motor is conducted into the gearbox through the heat conduction module of the end cover, and then heat dissipation is conducted through the gearbox. Compared with the prior art, the heat dissipation effect of the motor heat management system is obviously improved, a series of problems caused by overheating of the motor are solved, and the service life of the motor and related components is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and in particular to an electric motor thermal management system. Background Art

[0002] Electric motors are relatively commonly used driving devices. In industrial production, electric motors are crucial for ensuring the normal operation of the devices they drive. An electric motor generally includes a motor housing, a front end cover and a rear end cover at both ends of the motor housing. Inside the motor housing, there is a motor body, including a stator, a rotor and other components.

[0003] The motor control system is responsible for controlling the motor and driving the motor according to the control instructions of the electric lawn mower control system. The DC-DC converter, inverter and control circuit in the motor control system are easily affected by heat. During operation, power switching devices generate heat losses and need to be cooled in a timely manner. If the thermal management is improper, it may lead to control failure, component failure and vehicle operation failure. Usually, the electric control system is connected to the cooling system of the electric lawn mower to maintain the optimal temperature.

[0004] Since the wheels of the electric lawn mower are driven by the electric motor, the operating temperature of the electric motor is crucial for the performance of the vehicle. As the load increases, the heat generated by the electric motor also increases. During the operation of the electric motor, due to high-speed rotation, coil resistance heating, mechanical friction heating, etc., the temperature of the electric motor will rise, especially for an inner rotor electric motor. The whole electric motor is in a relatively enclosed space, and heat will accumulate rapidly in a short time. At the light level, it will reduce the insulation coefficient, and seriously, when the temperature exceeds a certain limit, it will break down the insulation and burn out the electric motor. In order to ensure the performance of the electric vehicle, the electric motor must be cooled.

[0005] How to reduce the temperature of the electric motor has become a major problem in the industry. To ensure the safe operation of the electric motor, guarantee the performance of the motor, and enable it to stably output, generally, the heat dissipation area of the motor housing is increased. The existing motor aluminum shell usually uses an aluminum shell housing plus radial ribs to increase the outer surface area of the motor shell, and installs heat sinks on the aluminum shell to improve the heat dissipation performance of the motor aluminum shell. However, the heat sinks installed on the motor aluminum shell are prone to blockage after long-term use, affecting the normal operation of the motor and being unfavorable for the discharge of heat inside the motor aluminum shell, so improvements are needed.

[0006] However, when the power of the motor is large, both of these methods seem to be insufficient. Therefore, there is an urgent need in the current market to develop an efficient heat dissipation system to meet the needs of high-power or high-speed motors. Most of the existing technologies focus on the motor itself, and the heat dissipation efficiency achieved is almost at its limit. However, people have overlooked the gearbox connected to the motor, which also has the potential to become the "main force" of heat dissipation. Thermal management powered by an electric gearbox is very important because it affects the performance, reliability, and stability of these vehicles. The optimal operating temperature is crucial for the normal operation of the battery pack, electronic control system, and motor of an electric lawn mower. When maintained at the optimal temperature, it can delay the decay of the battery's power, health, and capacity. At the optimal temperature, the electronic control and the motor can also operate in their best states.

[0007] This patent is obtained after research and exploration in the above background. Summary of the Invention

[0008] The purpose of this application is to address the above-mentioned needs by providing a motor thermal management system, which includes a motor, a gearbox, and a heat dissipation unit. The motor includes an end cover and an output rotating shaft. The side of the end cover facing the motor is the inner side, and the side facing the gearbox is the outer side. There is a through hole in the center of the end cover, and the output rotating shaft extends out from the through hole; the gearbox and the motor are separated by the end cover; the heat dissipation unit includes a heat conduction module arranged on the end cover. The heat generated inside the motor is conducted to the inside of the gearbox through the heat conduction module of the end cover, and then dissipated through the gearbox. Compared with the prior art, the heat dissipation effect is significantly improved, solving a series of problems caused by overheating of the motor and extending the service life of the motor and related components.

[0009] The advantage of this application lies in providing a motor thermal management system, in which a bearing and a sealing ring are arranged between the end cover and the output rotating shaft, and the output rotating shaft, the bearing, and the sealing ring are on the same axis. In this way, the oil in the gearbox is isolated from the motor, thus protecting the internal components of the motor. The contact area between the motor and the gearbox is increased, and the heat inside the motor is mainly transferred to the outside of the motor through heat conduction and heat radiation. Due to the convex structure of the end cover, the heat dissipation effect is improved by 2%.

[0010] The advantage of this application lies in providing a motor thermal management system, in which the compartment structure on the outer side of the end cover is arranged in an annular array, avoiding the generation of noise. At the same time, it also indirectly increases the contact area between the motor and the gearbox, improving the heat dissipation effect.

[0011] The advantage of this application lies in providing a motor thermal management system, in which the heat conduction module includes at least one heat dissipation cavity, which extends from the end cover towards the inner side. The integrally formed design reduces the production and assembly of parts, saving costs.

[0012] The advantage of this application is to provide a motor thermal management system. The gearbox includes a first housing, a second housing, and a gear transmission assembly. The first housing is located between the end cover and the second housing. The gear transmission assembly is meshed and connected to the output rotating shaft. A plurality of gears are configured in the gearbox. During operation, the high-speed rotation of the gears can tumble and splash the oil in the gearbox to the outer shell of the gearbox, thereby taking the heat away. In addition, the convex structure at the first end of the first housing increases the contact area between the gearbox and the outside world, thus improving the heat dissipation effect, and the heat dissipation effect is increased by 3%.

[0013] The advantage of this application is to provide a motor thermal management system. At least one S-shaped oil passage is formed on the inner surface of the first housing from top to bottom. The time for the oil in the gearbox to flow from the top of the first housing to the bottom of the first housing is delayed. After the oil in the gearbox is stirred, it stays in the top area of the inner surface of the first housing. Due to the action of gravity, the oil quickly slides down along the first housing wall to the bottom. The time for the oil to dissipate heat through the top of the first housing is short, and the temperature of the oil cannot be fully conducted to the outside through the top of the first housing. The S-shaped oil passage extends the sliding time of the oil from the top area to the bottom area of the first housing by presetting the sliding path of the oil, and the oil has sufficient time to complete heat conduction in the top area of the first housing, and the heat dissipation effect is increased by 2%.

[0014] The advantage of this application is to provide a motor thermal management system. At least one arc-shaped oil passage is formed in the top area of the inner surface of the first housing. The plane where each arc-shaped oil passage is located is perpendicular to the output rotating shaft. Whenever the oil is stirred and splashed to the inner area of the inner surface of the first housing by the gears, the oil stays in the arc-shaped oil passage for a short time, thereby extending the contact time between the oil and the first housing and increasing the contact area between the oil and the first housing. The heat conduction of the oil at the top is more sufficient, and the heat dissipation effect is increased by 2%. In addition, with the continuous stirring of the gears, the oil that previously stayed in the arc-shaped oil passage is squeezed by the subsequent oil, and the oil keeps flowing in the arc-shaped oil passage, improving the heat conduction efficiency of the oil.

[0015] The advantage of this application is to provide a motor thermal management system. The output rotating shaft is a hollow shaft, and a cylindrical cavity is formed along the axial direction of the output rotating shaft. The oil can enter the cylindrical cavity to take away the heat source at the motor. The oil keeps flowing in the hollow shaft. The oil has a relatively high specific heat capacity compared with the metal. The heat source at the motor is fully absorbed by the oil and continuously taken away through the end cover. Compared with a solid output rotating shaft, the hollow shaft concept of this application is unique, and the heat dissipation effect is increased by 3%.

[0016] The advantage of this application is to provide a motor thermal management system. At least one oil guiding hole is opened in the first housing part where the output rotating shaft is located, and the oil guiding hole communicates with the column cavity. The oil liquid in the column cavity can flow through the oil guiding hole. The oil liquid can not only oscillate and flow in the column cavity, but also continuously and fully exchange with the oil liquid inside the transmission box through the oil guiding hole and roll up and down, forming multiple oil guiding circuits in effect, and the heat dissipation effect is improved by 1%.

[0017] The advantage of this application is to provide a motor thermal management system. The heat conduction module includes at least one heat dissipation cavity, which extends inward from the end cover. The gearbox includes a first housing, a second housing and a gear transmission component. The first housing is located between the end cover and the second housing. The gear transmission component is meshed and connected with the output rotating shaft. At least one S-shaped oil passage is formed on the inner surface of the first housing from top to bottom. The time for the oil liquid in the gearbox to flow from the top of the first housing to the bottom of the first housing is delayed. The output rotating shaft is a hollow shaft, and a column cavity is formed along the axis of the output rotating shaft. Oil liquid can enter the column cavity to take away the heat source at the motor. At least one oil guiding hole is opened in the part of the output rotating shaft located in the first housing, and the oil guiding hole communicates with the column cavity. The oil liquid in the column cavity can flow through the oil guiding hole. A blowing part is arranged inside the motor. The blowing part is coaxially connected with the rotating module of the motor and can rotate synchronously. The blowing part is located on the side of the motor far from the end cover, and the air outlet direction of the blowing part faces the end cover side. Compared with the prior art, the heat dissipation efficiency of this motor thermal management system is improved by at least 10%.

[0018] In another aspect of this application, this application further provides a motor thermal management system, a motor. The motor includes an end cover and an output rotating shaft. The inner side of the end cover faces the motor, and the outer side of the end cover faces the gearbox. A through hole is formed in the center of the end cover, and the output rotating shaft extends out from the through hole; a gearbox, the gearbox and the motor are separated by the end cover; a heat dissipation unit; the heat dissipation unit includes a heat conduction module arranged on the end cover. The heat generated inside the motor is conducted to the inside of the gearbox through the heat conduction module of the end cover, and then dissipated through the gearbox.

[0019] According to an embodiment of this application, a bearing and a sealing ring are arranged between the end cover and the output rotating shaft, and the output rotating shaft, the bearing and the sealing ring are on the same axis.

[0020] According to an embodiment of this application, an array of compartments is formed on the outer side of the end cover, and each compartment narrows in the direction of the through hole.

[0021] According to an embodiment of the present application, the heat conduction module includes at least one heat dissipation cavity, which is formed by extending inward from the end cover.

[0022] According to an embodiment of the present application, the transmission includes a first housing, a second housing, and a gear transmission assembly. The gear transmission assembly is meshed and connected to the output rotating shaft. The first housing has a first end close to the motor and a second end close to the wheel shaft. The first end protrudes outward to form a hollow arc surface, and the second housing is connected to the outside of the first housing.

[0023] According to an embodiment of the present application, at least one S-shaped oil passage is formed on the inner surface of the first housing from top to bottom, so that the time for the oil fluid in the transmission to flow from the top of the first housing to the bottom of the first housing is retarded.

[0024] According to an embodiment of the present application, at least one arc-shaped oil passage is formed in the top region of the inner surface of the first housing, and the plane where each arc-shaped oil passage is located is perpendicular to the output rotating shaft.

[0025] According to an embodiment of the present application, the output rotating shaft is a hollow shaft, and a column cavity is formed along the axial direction of the output rotating shaft, so that the oil fluid can enter the column cavity to carry away the heat source at the motor.

[0026] According to an embodiment of the present application, at least one oil guiding hole is opened in the part of the first housing where the output rotating shaft is located, and the oil guiding hole is communicated with the column cavity, so that the oil fluid in the column cavity can flow through the oil guiding hole.

[0027] According to an embodiment of the present application, a blowing part is arranged inside the motor. The blowing part is coaxially connected to the rotating module of the motor and can rotate synchronously. The blowing part is located on the side of the motor away from the end cover, and the air outlet direction of the blowing part faces the end cover side.

[0028] According to an embodiment of the present application, the heat conduction module includes at least one heat dissipation cavity, which is formed by extending inward from the end cover. The gearbox includes a first housing, a second housing, and a gear transmission assembly. The first housing is located between the end cover and the second housing. The gear transmission assembly is meshed and connected with the output rotating shaft. The inner surface of the first housing forms at least one S-shaped oil passage from top to bottom, so that the time for the oil in the gearbox to flow from the top of the first housing to the bottom of the first housing is retarded. The output rotating shaft is a hollow shaft, and a column cavity is formed along the axial direction of the output rotating shaft, so that oil can enter the column cavity to take away the heat source at the motor. At least one oil guiding hole is provided in the part of the output rotating shaft located in the first housing, and the oil guiding hole is communicated with the column cavity, so that the oil in the column cavity can flow through the oil guiding hole. A blowing part is arranged inside the motor, and the blowing part is coaxially connected with the rotating module of the motor and can rotate synchronously. The blowing part is located on the side of the motor away from the end cover, and the air outlet direction of the blowing part faces the end cover side.

[0029] The above and other features and advantages of the exemplary embodiments of the present application will become more obvious from the following detailed description in conjunction with the drawings, and the description and drawings are only for exemplary purposes and do not limit the scope of the present application in any way. Description of the Drawings

[0030] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0031] Figure 1 It refers to a schematic diagram of a zero-turn drive axle in some embodiments of the present disclosure;

[0032] Figure 2 is based on Figure 1 of the motor structure diagram;

[0033] Figure 3 It is a structural cross-sectional view of the motor thermal management system of the present disclosure;

[0034] Figure 4 It is a structural diagram of the first perspective of the end cover provided in some embodiments of the present disclosure;

[0035] Figure 5 is based on Figure 3 provided by the second perspective structural diagram of the end cover;

[0036] Figure 6 It is a schematic diagram of the first housing provided in some embodiments of the present disclosure;

[0037] Figure 7Schematic diagram of another alternative first housing provided by some embodiments of the present disclosure;

[0038] Figure 8 Structural diagram of the output rotating shaft provided by some embodiments of the present disclosure;

[0039] Figure 9 Schematic diagram of the horizontal direction of the motor heat dissipation path provided by the present disclosure;

[0040] Figure 10 Schematic diagram of the vertical direction of the motor heat dissipation path provided by the present disclosure;

[0041] Figure 11 Schematic diagram of the motor heat flow provided by the present disclosure. Detailed Description of the Invention

[0042] The following provides a detailed description of the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not intended to limit the present disclosure.

[0043] In the present disclosure, unless otherwise stated, the orientation terms such as "inner" and "outer" refer to "inner" and "outer" relative to the contour of the corresponding component itself. In addition, the terms "first", "second", "third", etc. used in the present disclosure are used to distinguish one element from another, and do not have an order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements. The above definitions are only for explaining and illustrating the present disclosure, and should not be construed as a limitation to the present disclosure.

[0044] The hydraulic fluid mentioned in this application can be one or a combination of lubricating oil, lubricating fluid, cooling oil, and coolant. The main function of the hydraulic fluid is to provide lubrication, reduce the friction of gears, shafts, and other components, thereby reducing the attenuation of power, and at the same time improving the service life of the components. Secondly, due to the fluidity characteristics of the hydraulic fluid, it has a certain specific heat capacity, so it has a good effect of absorbing heat and can avoid excessive local temperature in the entire motor thermal management system.

[0045] Such as Figures 1 to 10As shown in the figure, in order to achieve the above object, in the first aspect of the present application, a motor thermal management system is provided, which includes a motor (10), a gearbox (20), and a heat dissipation unit (30). The motor (10) includes an end cover (11) and an output rotating shaft (12). The side of the end cover (11) facing the motor (10) is the inner side, and the side of the end cover (11) facing the gearbox (20) is the outer side. A through hole (110) is provided at the center of the end cover (11), and the output rotating shaft (12) extends out from the through hole (110). The gearbox (20) and the motor (10) are separated by the end cover (11). The heat dissipation unit (30) includes a heat conduction module (31) disposed on the end cover (11). The heat generated inside the motor (10) is conducted to the inside of the gearbox (20) through the heat conduction module of the end cover (11), and then dissipated through the gearbox (20).

[0046] Figure 1 It is a schematic diagram of a zero-turn drive axle of some embodiments of the present disclosure. The zero-turn drive axle is usually applied to a lawn mower in garden equipment. The motor thermal management system involved in the present application is a part of the zero-turn drive axle. The number of zero-turn drive axles is generally two. Each zero-turn drive axle can drive the wheels on one side of the vehicle body. By independently controlling the two zero-turn drive axles, the in-situ steering of the lawn mower can be achieved.

[0047] Figure 2 is based on Figure 1 motor structure diagram.

[0048] In the prior art, the conventional technical means for motor heat dissipation is to arrange dense heat sinks on the outer shell of the motor. The heat inside the motor is conducted to the heat sinks through the motor outer shell, thereby achieving the effect of temperature reduction. However, as the motor power increases, the control components of the motor are gradually increasing. Simply relying on motor heat dissipation has reached the physical limit. However, a motor is often not an independent device and needs to be used in cooperation with other devices. The motor thermal management system involved in the present application precisely grasps this key point, conducts a considerable part of the heat of the motor to the outside through the gearbox connected to the motor, and the heat dissipation effect is significantly improved. A series of problems caused by motor overheating are solved, and the service life of the motor and related components is improved. The gearbox designed in the present application can also be other devices closely connected to the motor, or a box that only plays a transmission and driving role without speed change. The core essence is that it can share and conduct the heat from the motor.

[0049] such as Figure 10As shown, during the operation of the motor (10), heat will continuously accumulate. The blowing part (13) rotates synchronously with the output rotating shaft (12) of the motor (10). The blowing part (13) takes the heat from the right end of the motor (10) to the left end of the motor (10). In other words, the heat is transferred to the side of the end cover (11) close to the motor (10). The end cover (11) is made of aluminum material with excellent thermal conductivity, and can efficiently conduct the heat inside the motor (10) to the inside of the transmission (20) through the end cover (11). A large number of shafts and gears are usually arranged inside the transmission (20). The power of the motor (10) is transmitted to the inside of the transmission (20) through the output rotating shaft (12). The shafts and gears inside the transmission (20) rotate at high speed, and finally transmit the power to the wheel shaft and drive the tire on the wheel shaft to run. It is worth mentioning that under normal working conditions, a certain amount of oil is configured inside the transmission (20). After the heat reaches the transmission (20), the first part of the heat is absorbed by the oil, and the second part of the heat is absorbed by the transmission (20), especially the upper part of the transmission (20). With the fluidity of the oil, the first part of the heat can be carried away to other areas of the transmission (20), such as the first housing (21), the second housing (22) and the wheel shaft, and is conducted to the outside air through the outer surface of the housing of the transmission (20). The second part of the heat is directly conducted to the outside air through the housing of the transmission (20). The part of the first part of the heat in the oil is brought to the upper part of the first housing (21) by the high-speed rotating gears, shafts, etc. Many grooves are further formed in the upper part of the first housing (21), and the oil stays at the grooves for a longer time, so as to conduct the heat in the oil to the outside air through the housing of the transmission (20).

[0050] As Figure 11 shown, a schematic diagram of the heat flow of the motor. After the heat is generated, it reaches the end cover (11) from the motor (10), then reaches the transmission (20), and finally is conducted to the outside through the housing of the transmission (20).

[0051] A bearing and a sealing ring are arranged between the end cover (11) and the output rotating shaft (12). The output rotating shaft (12), the bearing and the sealing ring are on the same axis. Further, the output rotating shaft (12) is supported by the bearing at the through hole (110). The sealing ring is sleeved outside the through hole (110), improving the sealing effect. The oil inside the transmission (20) cannot enter the inside of the motor (10) from the through hole (110), thus playing a role in protecting the motor (10).

[0052] Figure 3It is a structural sectional view of the motor thermal management system of the present disclosure.

[0053] Figure 4 It is a structural diagram of the first perspective of the end cover provided by some embodiments of the present disclosure. The heat conduction module (31) includes at least one heat dissipation cavity (310), and the heat dissipation cavity (310) is formed by extending inward from the end cover (11). The number of heat dissipation cavities (310) in this embodiment is 6.

[0054] Figure 5 It is based on Figure 3 It is a structural diagram of the second perspective of the end cover provided. An array of compartments (111) is formed on the outer side of the end cover (11). The dense compartments are equivalent to a large number of sound-absorbing structures, reducing the noise of the motor (10) and avoiding resonance. Each compartment (111) narrows in the direction of the through hole (110). In other words, the closer to the center of the end cover (11), the narrower the compartment (111), so as to make the most of the surface space of the end cover (11).

[0055] The transmission (20) includes a first housing (21), a second housing (22), and a gear transmission assembly (23). The gear transmission assembly (23) is meshed and connected to the output rotating shaft (12). The first housing (21) has a first end (210) close to the motor (10) and a second end (211) close to the wheel shaft. The first end (210) protrudes outward to form a hollow arc surface, thereby increasing the contact area between the first housing (21) and heat. The second housing (22) is connected to the outer side of the first housing (21).

[0056] Figure 6 It is a schematic diagram of the first housing provided by some embodiments of the present disclosure. At least one S-shaped oil passage (32) is formed on the inner surface of the first housing (21) from top to bottom, delaying the time for the oil fluid in the transmission (20) to flow from the top of the first housing (21) to the bottom of the first housing (21).

[0057] Figure 7 It is a schematic diagram of another alternative first housing provided by some embodiments of the present disclosure. At least one arc-shaped oil passage (33) is formed in the top region of the inner surface of the first housing (21), and the plane where each arc-shaped oil passage (33) is located is perpendicular to the output rotating shaft (12).

[0058] Under normal operating conditions, a certain amount of oil fluid exists at the bottom of the transmission (20), and its height generally does not exceed the center of the output rotating shaft (12). The oil fluid plays a role in lubrication and heat conduction.

[0059] The first housing of the traditional gearbox has a smooth inner surface. After the oil reaches the upper part of the gearbox, it will stay briefly on the inner surface of the first housing. During this period, the oil fully contacts the first housing and conducts heat to the outside. Due to gravity, after the oil is stirred to the upper part of the gearbox, it will quickly slide down along the inner surface of the first housing to the bottom of the gearbox. In other words, during the heat conduction process of the upper part of the gearbox, the proportion of heat dissipated through the oil is very small, and most of the heat in the oil is conducted to the outside through the outer housing of the lower part of the gearbox.

[0060] The S-shaped oil passage (32) described in this application has a tortuous shape and extends from the top to the bottom of the inner surface of the gearbox (20). When the oil is stirred and splashed to the upper part of the gearbox (20), the oil will slide along the S-shaped oil passage (32). In this way, it will take more time for the oil to reach the bottom of the gearbox (20). The longer residence time of the oil in the upper part of the gearbox (20) will bring a stronger heat exchange effect. In this way, it makes up for the defect of the waste of the inner surface space of the upper part of the gearbox (20), and fully utilizes the heat conduction function of the oil here. The arc-shaped oil passage (33) is another alternative to the S-shaped oil passage (32). The arc-shaped oil passage (33) makes the oil slide along a preset trajectory. As the oil is continuously stirred and splashed to the upper part of the gearbox (20), at the same position, the later-arriving oil can squeeze the previously arrived oil, and the previously arrived oil will not stay at a certain position forever. It will always be squeezed by the later-arriving oil. In this way, it solves the problem of the oil staying in the upper part of the gearbox (20) for too long.

[0061] The output rotating shaft (12) is a hollow shaft. The output rotating shaft (12) forms a cylindrical cavity (120) along the axial direction, and the oil can enter the cylindrical cavity (120) to take away the heat source at the motor (10).

[0062] At least one oil guiding hole (121) is opened in the part of the output rotating shaft (12) located in the first housing (21). The oil guiding hole (121) communicates with the cylindrical cavity (120), and the oil located in the cylindrical cavity (120) can flow through the oil guiding hole (121). The oil guiding hole (121) in this embodiment penetrates the cylindrical cavity (120).

[0063] A blowing part (13) is arranged inside the motor (10). The blowing part (13) is coaxially connected with the rotating module of the motor (10) and can rotate synchronously. The blowing part (13) is located on the side of the motor (10) away from the end cover (11), and the air outlet direction of the blowing part (13) faces the side of the end cover (11).

[0064] The best solution of this application is to integrate the technical features involved in this embodiment into a motor thermal management system. The heat conduction module (31) includes at least one heat dissipation cavity (310), and the heat dissipation cavity (310) extends inward from the end cover (11). The gearbox (20) includes a first housing (21), a second housing (22), and a gear transmission assembly (23). The first housing (21) is located between the end cover (11) and the second housing (22). The gear transmission assembly (23) is meshed and connected to the output rotating shaft (12). The inner surface of the first housing (21) forms at least one S-shaped oil passage from top to bottom, so that the time for the oil in the gearbox (20) to flow from the top of the first housing (21) to the bottom of the first housing (21) is retarded. The output rotating shaft (12) is a hollow shaft, and an axial column cavity (120) is formed along the axis of the output rotating shaft (12), so that oil can enter the column cavity (120) to take away the heat source at the motor (10). At least one oil guide hole (121) is provided in the part of the output rotating shaft (12) located in the first housing (21), and the oil guide hole (121) is communicated with the column cavity (120), so that the oil in the column cavity (120) can flow through the oil guide hole (121). A blowing part (13) is arranged inside the motor (10), and the blowing part (13) is coaxially connected to the rotating module of the motor (10) and can rotate synchronously. The blowing part (13) is located on the side of the motor (10) away from the end cover (11), and the air outlet direction of the blowing part (13) faces the side of the end cover (11).

[0065] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solutions of this application, and these simple modifications all fall within the protection scope of this disclosure.

[0066] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, this application does not separately describe various possible combination methods.

[0067] In addition, any combination can be made among various different embodiments of this application as long as it does not violate the idea of this application, and it should also be regarded as the content disclosed in this application.

Claims

1. A motor thermal management system, characterized in that: It comprises a motor (10), a gearbox (20), and a heat dissipation unit (30). The motor (10) comprises an end cover (11) and an output rotating shaft (12), wherein the side of the end cover (11) facing the motor (10) is an inner side, and the side of the end cover (11) facing the gearbox (20) is an outer side, and a through hole (110) is provided at the center of the end cover (11), and the output rotating shaft (12) protrudes from the through hole (110); The gearbox (20) and the motor (10) are separated by the end cover (11); The heat dissipation unit (30) comprises a heat conduction module (31) arranged on the end cover (11), and the heat generated inside the motor (10) is conducted to the gearbox (20) through the heat conduction module of the end cover (11), and then the heat is dissipated through the gearbox.

2. The motor thermal management system according to claim 1, characterized in that: A bearing and a sealing ring are arranged between the end cover (11) and the output rotating shaft (12); the output rotating shaft (12), the bearing and the sealing ring are located on the same axis.

3. The motor thermal management system according to claim 1, characterized in that: An array of compartments (111) is formed on the outer side of the end cover (11), and each of the compartments (111) narrows toward the through hole (110).

4. The motor thermal management system according to claim 1, characterized in that: The heat conduction module (31) comprises at least one heat dissipation hole (310), and the heat dissipation hole (310) is formed by extending the end cover (11) toward the inside.

5. The motor thermal management system according to claim 1, characterized in that: The gearbox (20) comprises a first shell (21), a second shell (22) and a gear transmission assembly (23); the gear transmission assembly (23) is meshingly connected with the output shaft (12); the first shell (21) has a first end (210) close to the motor (10) and a second end (211) close to the wheel shaft; the first end (210) is convex outward to form a hollow arc surface; the second shell (22) is connected to the outer side of the first shell (21).

6. The motor thermal management system according to claim 5, characterized in that: At least one S-shaped oil passage (32) is formed on the inner surface of the first shell (21) from top to bottom, so that the time for the oil in the gearbox (20) to move from the top of the first shell (21) to the bottom of the first shell (21) is delayed.

7. The motor thermal management system according to claim 5, characterized in that: At least one arc-shaped oil passage (33) is formed in the top area of ​​the inner surface of the first shell (21), and the plane where each arc-shaped oil passage (33) is located is perpendicular to the output shaft (12).

8. The motor thermal management system according to claim 5, characterized in that: The output rotating shaft (12) is a hollow shaft, and a column cavity (120) is formed along the axial direction of the output rotating shaft (12), and oil can enter the column cavity (120) to take away the heat source at the motor (10).

9. The motor thermal management system according to claim 8, characterized in that: The output shaft (12) is provided with at least one oil guide hole (121) in the portion of the first shell (21); the oil guide hole (121) is in communication with the column cavity (120), and the oil in the column cavity (120) can flow through the oil guide hole (121).

10. The motor thermal management system according to claim 1, characterized in that: The motor (10) is internally provided with a blowing section (13), the blowing section (13) being coaxially connected to a rotating module of the motor (10) so as to be able to rotate synchronously, the blowing section (13) being located on a side of the motor (10) away from the end cover (11), and the air outlet direction of the blowing section (13) being toward a side of the end cover (11).

11. The motor thermal management system according to claim 3, characterized in that: The heat conduction module (31) comprises at least one heat dissipation hole (310), and the heat dissipation hole (310) is formed by extending the end cover (11) toward the inside. The gearbox (20) comprises a first shell (21), a second shell (22) and a gear transmission assembly (23), the first shell (21) is located between the end cover (11) and the second shell (22), the gear transmission assembly (23) is meshingly connected with the output shaft (12), and the inner surface of the first shell (21) forms at least one S-shaped oil passage from top to bottom, so that the time for the oil in the gearbox (20) to travel from the top of the first shell (21) to the bottom of the first shell (21) is delayed, and the output shaft (12) is a hollow shaft, and the output shaft (12) is connected along the inner surface of the first shell (21). A column cavity (120) is formed axially, and oil can enter the column cavity (120) to take away the heat source at the motor (10). The output shaft (12) is located in the first shell (21) and has at least one oil guide hole (121). The oil guide hole (121) is connected to the column cavity (120), and the oil in the column cavity (120) can flow through the oil guide hole (121). A blowing part (13) is arranged inside the motor (10). The blowing part (13) is coaxially connected with the rotating module of the motor (10) and can rotate synchronously. The blowing part (13) is located on a side of the motor (10) away from the end cover (11), and the air outlet direction of the blowing part (13) is toward the side of the end cover (11).

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