Driving device and vehicle with same

Abstract

The driving device comprises an output shaft, a motor and a cooling channel, the motor is provided with a rotor and a rotor shaft, the rotor is arranged on the periphery of the rotor shaft in a sleeving mode, the interior of the rotor shaft is hollow, the output shaft is arranged in the rotor shaft, and the cooling channel is suitable for being filled with cooling liquid. The cooling channel comprises a first cooling channel formed in the output shaft and a second cooling channel formed between the output shaft and the rotor shaft, and the first cooling channel and the second cooling channel are communicated through a first communication opening in the output shaft. Therefore, the rotor shaft and the rotor sleeved on the rotor shaft are cooled, the cooling effect is ensured to a certain extent, the service life of the motor is prolonged, and the working performance of the motor is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle drive technology, and in particular to a drive device and a vehicle having the same. Background Technology

[0002] As the power unit of a vehicle, the drive unit typically transmits power effectively to the wheels of the vehicle, thereby generating driving force and enabling the vehicle to move normally.

[0003] As vehicle drive systems gradually develop towards higher power density, motors also develop towards higher power density and higher speed, resulting in increasing heat generation in motors.

[0004] In the prior art, in order to reduce the heat generated by the motor, coolant is usually introduced into the drive device to cool the motor. However, the cooling flow path of the existing drive device is relatively complex and the cooling effect is poor, which affects the cooling effect of the motor and thus affects the working performance of the drive device. Utility Model Content

[0005] This application provides a drive device and a vehicle having the same, which can improve the cooling effect on the motor.

[0006] In a first aspect, embodiments of this application provide a driving device, comprising: an output shaft; a motor having a rotor and a rotor shaft, the rotor being sleeved on the outer periphery of the rotor shaft, the rotor shaft being hollow inside, and the output shaft being disposed inside the rotor shaft; and a cooling channel adapted to be filled with coolant, the cooling channel including a first cooling channel formed inside the output shaft and a second cooling channel formed between the output shaft and the rotor shaft, the first cooling channel and the second cooling channel being connected through a first communication port on the output shaft.

[0007] In the above technical solution, by setting a first cooling channel inside the output shaft and a first connecting port on the output shaft connecting the first cooling channel and the second cooling channel, while delivering coolant between the output shaft and the rotor shaft, the coolant is positioned close to and / or located at the axial center of the rotor shaft when it enters the area between the output shaft and the rotor shaft. This allows the coolant entering the area between the output shaft and the rotor shaft to be quickly and evenly distributed along the axial direction of the rotor shaft, thereby improving the heat dissipation effect of the coolant on the rotor shaft and the rotor. This also makes the rotor run more smoothly at high speeds, ensuring the working performance of the motor to a certain extent, extending the service life of the motor, and thus extending the service life of the drive device and improving the driving performance of the drive device. As a result, the drive device performs well in terms of high efficiency, high stability and long life.

[0008] In some embodiments, the first communication port is disposed near the axial center of the rotor shaft; and / or, the first communication port is directly opposite the axial center of the rotor shaft.

[0009] In the above technical solution, the coolant entering between the output shaft and the rotor shaft can be effectively delivered to the axial center position near the rotor shaft and / or directly delivered to the axial center position of the rotor shaft, thereby enabling the coolant entering between the output shaft and the rotor shaft to be quickly and evenly distributed in the axial direction of the rotor shaft, improving the heat dissipation effect of the coolant on the rotor shaft and the rotor, and making the rotor more stable when running at high speed.

[0010] In some embodiments, the first communication port includes a plurality of first communication ports arranged at circumferential intervals along the output shaft.

[0011] In the above technical solution, by setting multiple first connection ports, the connection area of ​​the first cooling channel and the second cooling channel can be increased, so that the coolant in the first cooling channel can flow effectively into the second cooling channel, and to a certain extent, the flow rate of the coolant entering the second cooling channel can be guaranteed, thereby improving the cooling effect on the motor.

[0012] In some embodiments, the drive device further includes a housing, at least a portion of which extends out of the rotor shaft, the housing being disposed on the outer periphery of the output shaft to support the output shaft.

[0013] In the above technical solution, by using the housing to support the output shaft, the positional stability of the output shaft can be improved, and the working performance of the output shaft can be guaranteed to a certain extent.

[0014] In some embodiments, the cooling channel further includes a third cooling channel, which is disposed in the housing and connects to the external space of the housing and the first cooling channel.

[0015] In the above technical solution, the coolant outside the shell can be transported to the first cooling channel through the third cooling channel, so as to achieve the purpose of transporting coolant toward the first cooling channel, thereby facilitating the transport of coolant from the first cooling channel to the second cooling channel and reducing the difficulty of liquid inlet to the first and second cooling channels.

[0016] In some embodiments, a second through-hole is provided on the peripheral wall of the output shaft, and the third cooling channel is connected to the first cooling channel through the second through-hole.

[0017] In the above technical solution, the third cooling channel and the first cooling channel can be connected in a coordinated manner, and the difficulty of connecting the third cooling channel and the first cooling channel can be reduced, thereby facilitating the use of the third cooling channel to transport the coolant outside the shell to the first cooling channel.

[0018] In some embodiments, the housing has a guide column disposed between the peripheral wall of the housing and the output shaft, the guide column being hollow to form the third cooling channel, and the guide column surrounding the outer periphery of the second communication port.

[0019] In the above technical solution, by using guide columns to define the third cooling channel, the molding difficulty of the third cooling channel can be reduced, and the flow direction of the third cooling channel can be restricted, so that the coolant outside the shell can be effectively transported to the first cooling channel using the third cooling channel.

[0020] In some embodiments, a first seal is provided between the guide column and the output shaft.

[0021] In the above technical solution, the first sealing element can be used to achieve a sealing fit between the guide column and the output shaft, which to a certain extent prevents the coolant from overflowing at the contact point between the guide column and the output shaft, thereby preventing coolant leakage to a certain extent. This allows the coolant in the third cooling channel to flow effectively into the first cooling channel, improving the coolant inlet efficiency and ensuring the flow rate of the coolant entering the first cooling channel to a certain extent, thus improving the cooling effect of the coolant.

[0022] In some embodiments, a mounting cavity is formed between the peripheral wall of the housing and the output shaft, and a first support bearing and an oil seal are installed in the mounting cavity, which is connected to the third cooling channel.

[0023] In the above technical solution, by connecting the mounting cavity to the third cooling channel, it is convenient to transport some of the coolant in the third cooling channel to the mounting cavity, thereby realizing the use of coolant to lubricate the first support bearing and oil seal, reducing the friction between the first support bearing, oil seal and output shaft, making the rotation of the output shaft smoother, and also helping to extend the service life of the first support bearing and oil seal. By installing the first support bearing and oil seal in the mounting cavity, the first support bearing can prevent direct contact between the housing and the output shaft, which helps to reduce friction, heat generation and wear between the housing and the output shaft, and the first support bearing can also support the output shaft, making the rotation of the output shaft smoother. The oil seal mainly prevents coolant from leaking from the gap between the housing and the output shaft, so that the coolant entering the mounting cavity can effectively lubricate the first support bearing and oil seal, ensuring the lubrication effect to a certain extent.

[0024] In some embodiments, the peripheral wall of the guide column is provided with a guide port that penetrates through it, and the guide port is respectively connected to the mounting cavity and the third cooling channel.

[0025] In the above technical solution, while realizing the connection between the mounting cavity and the third cooling channel, the difficulty of connecting the mounting cavity and the third cooling channel can also be reduced, thereby facilitating the delivery of some coolant in the third cooling channel to the mounting cavity.

[0026] In some embodiments, the motor further includes a stator, which is sleeved on the outer periphery of the rotor and coupled to the rotor; a third through-hole is provided on the peripheral wall of the rotor shaft, which connects to the second cooling channel and is used to deliver the coolant toward the stator and / or the rotor.

[0027] In the above technical solution, by using the third connection port to deliver coolant to the stator and / or rotor, the coolant is used to cool the stator and / or rotor, thereby reducing the temperature of the stator and / or rotor, ensuring the working performance of the stator and / or rotor to a certain extent, and helping to extend the service life of the stator and / or rotor.

[0028] In some embodiments, the rotor of the motor is not directly opposite the third communication port in the radial direction.

[0029] In the above technical solution, by setting the rotor and the third connecting port to be non-directly opposite in the radial direction of the motor, the rotor can avoid obstructing the delivery of coolant from the third connecting port to the stator to a certain extent. This means that some of the coolant in the second cooling channel can be effectively output to the stator through the third connecting port, so as to use the coolant to cool the stator and reduce the cooling difficulty of the stator, thereby ensuring the working performance of the stator to a certain extent.

[0030] In some embodiments, the third communication port includes at least two, the at least two third communication ports are spaced apart along the axial direction of the rotor shaft, the distance between the at least two third communication ports is greater than the axial length of the rotor, and the rotor is located between two adjacent third communication ports in the axial direction of the motor.

[0031] In the above technical solution, by placing the rotor between two adjacent third connecting ports along the axial direction of the motor, the rotor is prevented from obstructing the delivery of coolant from the third connecting ports to the stator to a certain extent, thereby reducing the difficulty of cooling the stator.

[0032] In some embodiments, the outer periphery of the rotor shaft is provided with a second support bearing to support it, and the peripheral wall of the rotor shaft is provided with a fourth through port, the fourth through port being directly opposite the second support bearing and communicating with the second cooling channel.

[0033] In the above technical solution, at least a portion of the coolant in the second cooling channel can be transported to the second support bearing through the fourth connecting port, thereby lubricating the second support bearing, reducing friction between the second support bearing and the rotor shaft, making the rotor shaft rotate more smoothly, and also helping to extend the service life of the second support bearing. At the same time, by setting the second support bearing on the outer periphery of the rotor shaft to support it, the rotation of the rotor shaft is made smoother, ensuring the normal operation of the rotor shaft, and preventing direct contact between the rotor shaft and the housing of the drive device. This helps to reduce friction, heat generation and wear between the rotor shaft and the housing of the drive device, and extend the service life of the rotor shaft and the housing of the drive device.

[0034] In some embodiments, the first cooling channel extends along the axial direction of the output shaft, and the extension length of the first cooling channel is less than the extension direction of the output shaft.

[0035] In the above technical solution, while forming a first cooling channel inside the output shaft, it can also avoid reducing the structural strength of the output shaft too much due to opening the first cooling channel, thereby extending the service life of the output shaft and ensuring the working performance of the output shaft to a certain extent.

[0036] In some embodiments, the first cooling channel extends through the output shaft along its axial direction.

[0037] In the above technical solution, on the one hand, the molding difficulty of the first cooling channel can be reduced, and on the other hand, some coolant can be directly delivered to the differential through the first cooling channel to provide active lubrication to the components of the differential that require lubrication, thereby ensuring the working performance of the differential to a certain extent.

[0038] In some embodiments, a second seal is provided at each of the opposite ends of the first cooling channel, and an outlet is provided through the second seal near the differential. The outlet communicates with the first cooling channel, and the radial dimension of the outlet is smaller than the inner diameter of the first cooling channel.

[0039] In the above technical solution, by providing second seals at both ends of the first cooling channel, the sealing effect of the first cooling channel can be guaranteed to a certain extent, so that the coolant entering the first cooling channel can effectively enter the second cooling channel through the first connecting port; by providing an outlet through the second seal near the differential, and setting the radial dimension of the outlet to be smaller than the inner diameter of the first cooling channel, some coolant in the first cooling channel can be discharged through the outlet, so that coolant can be delivered towards the differential through the outlet, thereby providing active lubrication to the components of the differential that require lubrication.

[0040] Secondly, embodiments of this application provide a vehicle including the aforementioned drive unit.

[0041] In the above technical solution, by adopting the aforementioned drive device, the heat dissipation effect of the vehicle's drive device can be improved to a certain extent, thereby ensuring the vehicle's working performance to a certain extent.

[0042] Additional aspects and advantages of this application will become apparent from the description which follows, or may be learned by practice of this application. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a vehicle according to some embodiments of this application.

[0045] Figure 2 This is an exploded view of a battery according to some embodiments of this application.

[0046] Figure 3 This is a cross-sectional view of a portion of the structure of a drive device according to some embodiments of the first aspect of this application.

[0047] Figure 4 for Figure 3 A magnified view of a portion of region I in the middle.

[0048] Figure 5 This is an enlarged view of a portion of the structure when the rotor shaft and output shaft are engaged according to some embodiments of this application.

[0049] Figure 6 This is a cross-sectional view of a portion of the structure of a drive device according to some embodiments of the second aspect of this application.

[0050] Figure 7 This is a cross-sectional view of a portion of the structure of a drive device according to some embodiments of the third aspect of this application.

[0051] Figure label:

[0052] 1000, vehicles;

[0053] 100. Drive unit;

[0054] 110. Electric motor;

[0055] 111. Rotor;

[0056] 112. Rotor shaft; 1121. Third connecting port; 1122. Fourth connecting port;

[0057] 113. Stator;

[0058] 120. Output shaft;

[0059] 121. First connecting port;

[0060] 122, Second connecting port; 1221, Connecting loop; 1222, Connecting hole;

[0061] 130. Cooling passage;

[0062] 131. First cooling channel; 132. Second cooling channel; 133. Third cooling channel;

[0063] 140. Shell; 141. Flow guide column; 1411. Flow guide port;

[0064] 151. First sealing element;

[0065] 152. Second seal; 1521. Outlet port;

[0066] 160. Installation cavity;

[0067] 171. First support bearing;

[0068] 172. Second support bearing;

[0069] 180. Oil seal;

[0070] 200. Battery;

[0071] 210. Box body; 211. First part; 212. Second part;

[0072] 220. Battery cell. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0075] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0077] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0078] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0079] In this application, "multiple" means two or more, including two.

[0080] It should be noted that when a drive unit is applied to a vehicle, its main function is to effectively transmit power to the vehicle's wheels, thereby generating driving force so that the vehicle can move normally.

[0081] As the new energy vehicle market continues to expand and technology continues to advance, more and more electric drive devices are being used in electric and hybrid vehicles. In order to reduce the number of connecting parts and redundant components and improve the overall performance and efficiency of the electric drive device, the motor, reducer and differential of the electric drive device are usually arranged coaxially to form a coaxial electric drive device.

[0082] However, in coaxial electric drive systems, the compact layout of components such as the motor, reducer, and differential makes the heat dissipation problem of the motor more prominent. If the heat of the motor cannot be effectively dissipated, it will continue to accumulate inside the motor. As the heat accumulates, the power output capability of the motor will gradually decrease, affecting the overall performance of the electric drive system.

[0083] In the prior art, in order to dissipate heat from the motor, a cooling channel is usually set on the outer periphery of the motor, and coolant is circulated in the cooling channel. The coolant exchanges heat with the motor to achieve the purpose of dissipating heat from the battery.

[0084] However, the applicant found that the existing cooling channel layout is quite complex, which increases the manufacturing difficulty of the electric drive unit and thus the difficulty of heat dissipation of the motor. At the same time, because the coaxial electric drive unit has a half-shaft in the middle, it restricts the flow of coolant into the motor rotor shaft, causing the coolant to only flow into the rotor shaft from one end. This results in the coolant not being able to be distributed quickly and evenly within the rotor shaft, which not only affects the heat dissipation effect on the motor but also affects the stability of the motor when running at high speed, reducing the motor's working performance.

[0085] To solve the above problems, combined with Figures 3-7 As shown in the figure, this application embodiment provides a drive device 100. The drive device 100 has cooling channels 130 (first cooling channel 131 and second cooling channel 132) both inside the output shaft 120 and between the output shaft 120 and the rotor shaft 112. The first cooling channel 131 formed inside the output shaft 120 and the second cooling channel 132 formed between the output shaft 120 and the rotor shaft 112 are connected through a first connecting port 121 on the output shaft 120. This allows the first cooling channel 131 and the first connecting port 121 to deliver coolant into the rotor shaft 112. This facilitates the rapid and uniform distribution of coolant entering the rotor shaft 112, improves the heat dissipation effect on the motor 110, and makes the motor 110 more stable when running at high speed. To a certain extent, this ensures the working performance of the motor 110, extends the service life of the motor 110, and thus extends the service life of the drive device 100 and improves the driving performance of the drive device 100. As a result, the drive device 100 performs well in terms of high efficiency, high stability and long life.

[0086] like Figure 1 As shown, this application embodiment also provides a vehicle 1000 using the above-mentioned drive device 100. The drive device 100 is provided inside the vehicle 1000 as the power system of the vehicle 1000. It is mainly used to convert electrical energy into mechanical energy and output the mechanical energy to the wheels of the vehicle 1000 to drive the vehicle 1000 to move.

[0087] The vehicle 1000 mentioned here can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc.

[0088] In some embodiments, combined with Figure 1 and Figure 2 As shown, the vehicle 1000 is equipped with a battery 200, which is used to provide power to the drive unit 100. The battery 200 can be located at the bottom, front or rear of the vehicle 1000.

[0089] In some embodiments, such as Figure 2 As shown, the battery 200 includes a battery cell 220 and a housing 210, with the battery cell 220 housed within the housing 210. This allows the housing 210 to support and protect the battery cell 220, improving its structural stability, extending its lifespan, and enhancing its safety during use.

[0090] The housing 210 can adopt various structures.

[0091] In some embodiments, such as Figure 2 As shown, the housing 210 may include a first part 211 and a second part 212, the first part 211 and the second part 212 cover each other, and the first part 211 and the second part 212 together define a receiving cavity for accommodating the battery cell 220, so as to reduce the molding difficulty of the housing 210 and facilitate the placement of the battery cell 220 inside the housing 210.

[0092] In this design, the first part 211 can be a hollow structure open at one end, and the second part 212 can be a plate-like structure. The second part 212 covers the open side of the first part 211 (not shown in the example figure), so that the first part 211 and the second part 212 together define a receiving cavity; or, the second part 212 can be a hollow structure open at one end, and the first part 211 can be a plate-like structure (not shown in the example figure). The first part 211 covers the open side of the second part 212, so that the first part 211 and the second part 212 can also cooperate to define a receiving cavity; or, as... Figure 2As shown, both the first part 211 and the second part 212 are hollow structures with one side open. The open side of the first part 211 covers the open side of the second part 212 to define the receiving cavity.

[0093] It should be noted that the box 210 formed by the first part 211 and the second part 212 can be of various shapes, such as cylinder, cube or cuboid; the battery cell 220 can be of various shapes, such as cylinder or square.

[0094] In some embodiments, the housing 210 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 210 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 210 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0095] Of course, in some other embodiments, the battery 200 may not have a housing 210, but may only include battery cells 220. Multiple battery cells 220 are electrically connected and assembled into the vehicle 1000 after being formed into a whole by a fixed structure.

[0096] In a specific example, the drive unit 100 is installed in the engine compartment of the vehicle 1000.

[0097] Wherein, when vehicle 1000 is a front-wheel drive vehicle, drive unit 100 is installed in the front engine compartment of vehicle 1000 and is used to output the aforementioned mechanical energy to the front wheels of vehicle 1000 to drive vehicle 1000; when vehicle 1000 is a rear-wheel drive vehicle, drive unit 100 is installed in the rear engine compartment of vehicle 1000 and is used to output the aforementioned mechanical energy to the rear wheels of vehicle 1000 to drive vehicle 1000; when vehicle 1000 is a four-wheel drive vehicle, there are two drive units 100: one electric drive unit 100 is installed in the front engine compartment of vehicle 1000 and is used to output the aforementioned mechanical energy to the front wheels of vehicle 1000, and the other drive unit 100 is installed in the rear engine compartment of vehicle 1000 and is used to output the aforementioned mechanical energy to the rear wheels of vehicle 1000 to drive vehicle 1000.

[0098] The driving device 100 according to an embodiment of this application is described below with reference to the accompanying drawings.

[0099] Combination Figure 3 and Figure 5 As shown, the drive unit 100 includes an output shaft 120, a motor 110, and a cooling channel 130.

[0100] Among them, such as Figure 3As shown, the motor 110 has a rotor 111 and a rotor shaft 112. The rotor 111 is sleeved on the outer periphery of the rotor shaft 112, and the rotor shaft 112 is hollow inside. The output shaft 120 is located inside the rotor shaft 112. That is, the rotor 111 is located on the outer periphery of the rotor shaft 112, and the rotor shaft 112 is hollow inside and has an output shaft 120. This facilitates the use of the rotor 111 to drive the rotor shaft 112 to rotate, and also helps to achieve the coaxial arrangement of the motor 110, the reducer, and the differential. As a result, the drive device 100 has advantages such as high efficiency, lightweight, high space utilization, and easy integration.

[0101] In some embodiments, the rotor 111 can be connected to the outer periphery of the rotor shaft 112 by means of bonding, snap-fitting or bolting, so that the relative position of the rotor 111 and the rotor shaft 112 is stable, thereby facilitating the use of the rotor 111 to drive the rotor shaft 112 to rotate.

[0102] In a specific example, the motor 110 is mainly used to convert the electrical energy provided by the battery 200 into mechanical energy.

[0103] Specifically, the drive unit 100 also includes a reducer and a differential. The motor 110, as the power source of the drive unit 100, converts electrical energy into mechanical energy to generate rotational torque, thereby driving the input shaft of the reducer to rotate together. At this time, the reducer converts the high-speed, low-torque power of the motor 110 into low-speed, high-torque power through a series of gears or planetary gear mechanisms and other transmission elements. Then, the reducer transmits the power to the differential, and the differential transmits the power to the wheels through the output shaft 120 and other transmission elements to drive the vehicle 1000 forward or backward.

[0104] Combination Figure 3 and Figure 5 As shown, the cooling channel 130 is suitable for being filled with coolant. The cooling channel 130 includes a first cooling channel 131 and a second cooling channel 132. The first cooling channel 131 is formed inside the output shaft 120, and the second cooling channel 132 is formed between the output shaft 120 and the rotor shaft 112. The first cooling channel 131 and the second cooling channel 132 are connected through a first connecting port 121 on the output shaft 120. This means that the output shaft 120 is provided with a first connecting port 121, which connects the first cooling channel 131 and the second cooling channel 132 respectively, thereby achieving communication between the first cooling channel 131 and the second cooling channel 132. This reduces the difficulty of connecting the first cooling channel 131 and the second cooling channel 132, allowing the coolant in the first cooling channel 131 and the second cooling channel 132 to circulate between them.

[0105] In a specific example, the first cooling channel 131 is adapted to communicate with the external space of the drive device 100, so that external coolant can be delivered into the first cooling channel 131. The coolant entering the first cooling channel 131 then flows into the second cooling channel 132 through the first connecting port 121, so as to use the second cooling channel 132 to cool the rotor shaft 112, reduce the temperature of the rotor shaft 112, which is beneficial to reduce the temperature of the motor 110, extend the service life of the motor 110, and to a certain extent ensure the working performance of the motor 110.

[0106] It should be noted that since the rotor 111 of the motor 110 is sleeved on the outer circumference of the rotor shaft 112, when the coolant cools the rotor shaft 112, the temperature of the rotor shaft 112 decreases. The decreased temperature can be transferred to the rotor 111 to cool the rotor 111, thereby achieving the purpose of cooling and heat dissipation of the rotor 111 and ensuring the working performance of the rotor 111 to a certain extent.

[0107] In other words, the coolant in the second cooling channel 132 can not only cool the rotor shaft 112, but also the rotor 111, so as to reduce the temperature of the rotor shaft 112 and the rotor 111, thereby reducing the temperature of the motor 110.

[0108] It should be emphasized that by utilizing the heat transfer between the rotor shaft 112 and the rotor 111 to cool and dissipate heat from the rotor 111, compared to the prior art of opening a hole in the rotor shaft 112 and directly introducing coolant into the rotor 111, the wear of the rotor 111 can be reduced, and the efficiency loss of the rotor 111 can be avoided to a certain extent, thereby ensuring the working performance of the rotor 111 to a certain extent.

[0109] Furthermore, by providing a first cooling channel 131 inside the output shaft 120 and a first connecting port 121 on the output shaft 120 to connect the first cooling channel 131 and the second cooling channel 132, when supplying coolant between the output shaft 120 and the rotor shaft 112, the inlet position between the output shaft 120 and the rotor shaft 112 can be set near the axial center of the rotor shaft 112 and / or located at the axial center of the rotor shaft 112 through the first connecting port 121. This allows the coolant entering between the output shaft 120 and the rotor shaft 112 to be quickly and evenly distributed along the axial direction of the rotor shaft 112. This not only improves the heat dissipation effect of the coolant on the rotor shaft 112 and the rotor 111, but also makes the rotor 111 more stable when running at high speed, thus ensuring the working performance of the motor 110 to a certain extent, extending the service life of the motor 110, and consequently extending the service life of the drive device 100 and improving the driving performance of the drive device 100. As a result, the drive device 100 performs well in terms of high efficiency, high stability and long life.

[0110] In some embodiments, combined with Figure 3 and Figure 5 As shown, the first connecting port 121 is provided on the peripheral wall of the output shaft 120 and passes through the output shaft 120, so as to realize the first cooling channel 131 and the second cooling channel 132 by means of the first connecting port 121.

[0111] As can be seen from the above structure, the drive device 100 of this application embodiment, by placing the output shaft 120 inside the rotor shaft 112, facilitates the coaxial arrangement of the motor 110, the reducer and the differential, thereby giving the drive device 100 advantages such as high efficiency, lightweight, high space utilization and easy integration.

[0112] Meanwhile, by providing a first cooling channel 131 inside the output shaft 120 and a first connecting port 121 on the output shaft 120 connecting the first cooling channel 131 and the second cooling channel 132, while delivering coolant between the output shaft 120 and the rotor shaft 112, the coolant entering between the output shaft 120 and the rotor shaft 112 is positioned close to and / or located at the axial center of the rotor shaft 112. This allows the coolant entering between the output shaft 120 and the rotor shaft 112 to be quickly and evenly distributed along the axial direction of the rotor shaft 112, thereby improving the heat dissipation effect of the coolant on the rotor shaft 112 and the rotor 111. This also makes the rotor 111 more stable when running at high speed, ensuring the working performance of the motor 110 to a certain extent, extending the service life of the motor 110, and thus extending the service life of the drive device 100 and improving the driving performance of the drive device 100.

[0113] Understandably, compared to the prior art where coolant is introduced from one end of the rotor shaft 112, this application provides a first cooling channel 131 inside the output shaft 120, and a first connecting port 121 connecting the first cooling channel 131 and the second cooling channel 132 on the output shaft 120. This allows the coolant to enter the area between the output shaft 120 and the rotor shaft 112 at a position close to and / or located at the axial center of the rotor shaft 112. This enables the coolant entering the area between the output shaft 120 and the rotor shaft 112 to be quickly and evenly distributed along the axial direction of the rotor shaft 112, thereby improving the heat dissipation effect of the coolant on the rotor shaft 112 and the rotor 111, and making the rotor 111 more stable when operating at high speed.

[0114] The coolant mentioned in this application may be cooling water, cooling oil, etc.

[0115] In some embodiments, combined with Figure 3 and Figure 5As shown, the interior of the output shaft 120 is at least partially hollow to form a first cooling channel 131 inside the output shaft 120 and reduce the difficulty of forming the first cooling channel 131.

[0116] In some embodiments, combined with Figure 3 and Figure 5 As shown, at least a portion of the rotor shaft 112 is spaced apart from the output shaft 120 in the radial direction of the rotor shaft 112, so as to form a second cooling channel 132 between the output shaft 120 and the rotor shaft 112 and reduce the forming difficulty of the second cooling channel 132.

[0117] In some embodiments, combined with Figure 3 and Figure 5 As shown, the first connecting port 121 is located near the axial center of the rotor shaft 112. When coolant is supplied between the output shaft 120 and the rotor shaft 112 via the first connecting port 121, the coolant is first supplied to the position near the axial center of the rotor shaft 112. Subsequently, the coolant entering between the output shaft 120 and the rotor shaft 112 moves towards both ends of the rotor shaft 112 under the centrifugal force of the rotor 111. This not only cools the rotor shaft 112 and the rotor 111, but also allows the coolant entering between the output shaft 120 and the rotor shaft 112 to be quickly and evenly distributed along the axial direction of the rotor shaft 112. This improves the heat dissipation effect of the coolant on the rotor shaft 112 and the rotor 111, and makes the rotor 111 more stable during high-speed operation, thus ensuring the working performance of the motor 110 to a certain extent.

[0118] The axial middle part of the rotor shaft 112 mentioned here can be understood as the position close to the axial center of the rotor shaft 112 along its axial direction.

[0119] In other embodiments, the first connecting port 121 is directly opposite the axial center of the rotor shaft 112. That is, the first connecting port 121 is positioned directly opposite the axial center of the rotor shaft 112 in the radial direction. In this way, when coolant is supplied between the output shaft 120 and the rotor shaft 112 via the first connecting port 121, the coolant is first supplied to the axial center of the rotor shaft 112. Subsequently, the coolant entering between the output shaft 120 and the rotor shaft 112 moves towards both ends of the rotor shaft 112 under the centrifugal force of the rotor 111. This achieves the cooling of the rotor shaft 112 and the rotor 111 with coolant, while also enabling the coolant entering between the output shaft 120 and the rotor shaft 112 to be quickly and uniformly distributed in the axial direction of the rotor shaft 112.

[0120] In some other embodiments, a plurality of first connecting ports 121 are provided in the axial direction of the output shaft 120. Some of the first connecting ports 121 are located near the axial center of the rotor shaft 112, while others are directly opposite the axial center of the rotor shaft 112 (not shown in this example figure). This means that when a plurality of first connecting ports 121 are provided in the axial direction of the output shaft 120, some of the first connecting ports 121 are located near the axial center of the rotor shaft 112, while others are directly opposite the axial center of the rotor shaft 112. This allows the coolant entering between the output shaft 120 and the rotor shaft 112 to be delivered to the location near the axial center of the rotor shaft 112 and directly to the location directly opposite the axial center of the rotor shaft 112, respectively, so that the coolant entering between the output shaft 120 and the rotor shaft 112 can be quickly and uniformly distributed in the axial direction of the rotor shaft 112.

[0121] Furthermore, by providing multiple first connecting ports 121 along the axial direction of the output shaft 120, the cooperation of multiple first connecting ports 121 can increase the connection area of ​​the first cooling channel 131 and the second cooling channel 132, thereby enabling the coolant in the first cooling channel 131 to flow effectively into the second cooling channel 132, and to a certain extent ensuring the flow rate of the coolant entering the second cooling channel 132, so as to use the coolant to cool the rotor shaft 112 and the rotor 111, thereby improving the cooling effect.

[0122] In some embodiments, such as Figure 5 As shown, the first connecting port 121 includes multiple ports, which are arranged at intervals along the circumference of the output shaft 120. This means that multiple spaced-apart first connecting ports 121 are provided along the circumference of the output shaft 120. The combination of these multiple circumferential first connecting ports 121 increases the communication area between the first cooling channel 131 and the second cooling channel 132, thereby allowing the coolant in the first cooling channel 131 to effectively flow into the second cooling channel 132 and ensuring, to a certain extent, the flow rate of coolant entering the second cooling channel 132, thus improving the cooling effect on the motor 110.

[0123] In some embodiments, the output shaft 120 is provided with a plurality of spaced first communication ports 121 (not shown in the example figure) in both the circumferential and axial directions to maximize the connection area of ​​the first cooling channel 131 and the second cooling channel 132.

[0124] In some embodiments, such as Figure 3As shown, the drive device 100 also includes a housing 140, with at least a portion of the output shaft 120 extending out of the rotor shaft 112. The housing 140 is disposed on the outer periphery of the output shaft 120 to support the output shaft 120. This improves the positional stability of the output shaft 120 and, to a certain extent, ensures the working performance of the output shaft 120.

[0125] In some embodiments, combined with Figure 3 , Figure 4 and Figure 5 As shown, the cooling channel 130 also includes a third cooling channel 133, which is located in the housing 140 and connects to the external space of the housing 140 and the first cooling channel 131. This allows the third cooling channel 133 to transport coolant from outside the housing 140 to the first cooling channel 131, thus facilitating the transport of coolant from the first cooling channel 131 to the second cooling channel 132 and reducing the difficulty of liquid intake into both channels.

[0126] Meanwhile, since the housing 140 itself has a certain structural strength and structural stability, by setting the third cooling channel 133 in the housing 140, the structural stability of the third cooling channel 133 can be improved, so that the coolant outside the housing 140 can be effectively transported to the first cooling channel 131 by the third cooling channel 133, reducing the difficulty of liquid inlet in the first cooling channel 131 and improving the liquid inlet effect.

[0127] In some embodiments, a liquid storage tank is provided on the outside of the housing 140, and a third cooling channel 133 is connected to the liquid storage tank so as to transport the coolant outside the housing 140 to the first cooling channel 131 by means of the third cooling channel 133.

[0128] In a specific example, when cooling of the rotor shaft 112 and rotor 111 is required, external coolant can first be supplied to the first cooling channel 131 through the third cooling channel 133. When the coolant enters the first cooling channel 131, it flows along the extension direction of the first cooling channel 131. When the coolant flows to the first connecting port 121, it is supplied to the second cooling channel 132 through the first connecting port 121, thereby achieving the supply of coolant between the output shaft 120 and the rotor shaft 112. Simultaneously, because the first... The connecting port 121 is located near the axial center of the rotor shaft 112 and / or the first connecting port 121 is located directly opposite the axial center of the rotor shaft 112. In this way, when the coolant enters between the output shaft 120 and the rotor shaft 112, the coolant can move towards both ends of the rotor shaft 112 under the action of centrifugal force, so as to realize the use of coolant to cool the rotor shaft 112 and the rotor 111. At the same time, the coolant entering between the output shaft 120 and the rotor shaft 112 can be quickly and uniformly distributed in the axial direction of the rotor shaft 112.

[0129] In some embodiments, combined with Figure 3 and Figure 4 As shown, a second connecting port 122 is provided on the peripheral wall of the output shaft 120, through which the third cooling channel 133 is connected to the first cooling channel 131 via the second connecting port 122. This enables the third cooling channel 133 and the first cooling channel 131 to be connected, and reduces the difficulty of connecting the third cooling channel 133 and the first cooling channel 131, thereby facilitating the use of the third cooling channel 133 to transport the coolant outside the housing 140 to the first cooling channel 131.

[0130] In some embodiments, combined with Figure 3 and Figure 4 As shown, the housing 140 has a guide column 141 disposed between the peripheral wall of the housing 140 and the output shaft 120. The guide column 141 is hollow to form a third cooling channel 133, and the guide column 141 surrounds the outer periphery of the second communication port 122. By using the guide column 141 to define the third cooling channel 133, the molding difficulty of the third cooling channel 133 can be reduced, and the guiding direction of the third cooling channel 133 can be restricted, so that the coolant outside the housing 140 can be effectively transported to the first cooling channel 131 through the third cooling channel 133.

[0131] Meanwhile, by surrounding the second connecting port 122 with the guide column 141, the third cooling channel 133 can be positioned directly opposite the second connecting port 122, thereby facilitating the connection between the third cooling channel 133 and the second connecting port 122, reducing the difficulty of connecting the third cooling channel 133 and the second connecting port 122, and further reducing the difficulty of connecting the third cooling channel 133 and the first cooling channel 131.

[0132] It should be noted that since the guide column 141 is located between the peripheral wall of the housing 140 and the output shaft 120, the peripheral wall of the housing 140 and the output shaft 120 can be used to support the guide column 141, thereby improving the structural stability of the guide column 141. In this way, when the guide column 141 defines the third cooling channel 133, the structural stability of the third cooling channel 133 can be improved, so that the coolant outside the housing 140 can be effectively transported to the first cooling channel 131 through the third cooling channel 133.

[0133] In some embodiments, the guide column 141 is fixedly connected to one of the peripheral wall of the housing 140 and the output shaft 120, and rotates with the other. While realizing the support of the guide column 141 by the cooperation of the peripheral wall of the housing 140 and the output shaft 120, it can also avoid the guide column 141 restricting the rotation of the output shaft 120 relative to the housing 140, thus ensuring the working performance of the output shaft 120 to a certain extent.

[0134] In some embodiments, such as Figure 4 As shown, the guide column 141 is fixedly connected to the peripheral wall of the housing 140, and the guide column 141 is rotatably engaged with the output shaft 120. The fixed connection between the guide column 141 and the peripheral wall of the housing 140 can be welding, bonding, snap-fitting, bolting, or integral molding, etc.

[0135] Optionally, such as Figure 4 As shown, the guide column 141 and the peripheral wall of the housing 140 are integrally formed. While achieving a fixed connection between the guide column 141 and the peripheral wall of the housing 140, the connection difficulty between the guide column 141 and the housing 140 can also be reduced and the connection quality can be improved, so that the housing 140 can stably support the guide column 141 and improve the positional stability of the guide column 141.

[0136] In other embodiments, the guide column 141 is fixedly connected to the output shaft 120, and the guide column 141 is rotatably engaged with the peripheral wall of the housing 140 (not shown in the example figure). The fixed connection between the guide column 141 and the output shaft 120 can also be welding, bonding, snap-fitting, bolting, or integral molding, etc., which will not be elaborated here.

[0137] In some embodiments, combined with Figure 3 and Figure 4As shown, the second connecting port 122 includes a connecting ring 1221 and a connecting hole 1222. The connecting ring 1221 is disposed on the outer surface of the peripheral wall of the output shaft 120 and extends along the circumference of the output shaft 120 to form an annular structure. The connecting hole 1222 is disposed on the inner surface of the peripheral wall of the output shaft 120 and connects to the connecting ring 1221. The connecting ring 1221 and the connecting hole 1222 cooperate to penetrate the peripheral wall of the output shaft 120. When the third cooling channel 133 delivers coolant to the first cooling channel 131 through the second connecting port 122, the coolant first enters the connecting ring 1221 and flows around the circumference of the output shaft 120. When the coolant flows to the connecting ring 1221, the coolant flows to the first cooling channel 131 through the connecting ring 1221, so as to achieve the purpose of delivering coolant to the first cooling channel 131 using the third cooling channel 133.

[0138] In some embodiments, the connecting holes 1222 include a plurality of holes, which are arranged at intervals along the circumference of the output shaft 120. The plurality of connecting holes 1222 cooperate to increase the communication area between the third cooling channel 133 and the first cooling channel 131, thereby enabling the coolant in the third cooling channel 133 to flow effectively into the first cooling channel 131 and ensuring the flow rate of the coolant entering the first cooling channel 131 to a certain extent, so as to use the coolant to cool the rotor shaft 112 and the rotor 111 and improve the cooling effect.

[0139] In some embodiments, combined with Figure 3 and Figure 4 As shown, a first seal 151 is provided between the guide column 141 and the output shaft 120. This can be understood as follows: when the guide column 141 and the output shaft 120 are rotated together, the first seal 151 is provided between them. The first seal 151 is used to achieve a sealing fit between the guide column 141 and the output shaft 120, preventing coolant from overflowing at the contact point between the guide column 141 and the output shaft 120 to a certain extent. This prevents coolant leakage to a certain extent, allowing the coolant in the third cooling channel 133 to effectively flow into the first cooling channel 131. While improving the coolant inlet efficiency, it also ensures the flow rate of coolant entering the first cooling channel 131 to a certain extent, thus improving the cooling effect of the coolant.

[0140] It should be noted that when the guide column 141 and the housing 140 are rotated together, the first sealing element 151 is located between the guide column 141 and the housing 140.

[0141] In some embodiments, the first seal 151 is a sealing ring, which is sleeved on the outer periphery of the output shaft 120 and located between the guide column 141 and the output shaft 120 to achieve a sealing fit between the guide column 141 and the output shaft 120.

[0142] In some embodiments, such as Figure 4 As shown, the outer periphery of the output shaft 120 is provided with two first seals 151. The two first seals 151 are spaced apart axially on the second connecting port 122 so that the second connecting port 122 is located between the two first seals 151. In this way, when the coolant is delivered from the third cooling channel 133 to the first cooling channel 131, the coolant can be prevented from moving axially along the output shaft 120 to a certain extent, thereby enabling the coolant in the third cooling channel 133 to be effectively delivered to the first cooling channel 131, improving the liquid inlet efficiency and liquid inlet volume.

[0143] In some embodiments, an installation groove (not shown in the figure) is provided on the outer periphery of the output shaft 120, and the first seal 151 is disposed in the installation groove to improve the connection strength between the first seal 151 and the output shaft 120, thereby improving the positional stability of the first seal 151 and ensuring the sealing performance of the first seal 151 to a certain extent.

[0144] When the first seal 151 is located on the outer periphery of the output shaft 120, the first seal 151 can be fixedly connected to the output shaft 120 by means of bonding, snap-fitting or bolting, thereby further improving the positional stability of the first seal 151.

[0145] In some embodiments, combined with Figure 3 and Figure 4 As shown, a mounting cavity 160 is formed between the peripheral wall of the housing 140 and the output shaft 120. A first support bearing 171 and an oil seal 180 are installed within the mounting cavity 160, which is connected to a third cooling channel 133. This facilitates the transfer of some coolant from the third cooling channel 133 to the mounting cavity 160. Because the first support bearing 171 and oil seal 180 are located within the mounting cavity 160, the coolant can lubricate them, reducing friction between the first support bearing 171, oil seal 180, and the output shaft 120, resulting in smoother rotation of the output shaft 120 and extending the service life of the first support bearing 171.

[0146] In some embodiments, the coolant is cooling oil. This allows for the use of coolant to lubricate the first support bearing 171 and ensures a certain level of lubrication effectiveness.

[0147] The first support bearing 171 is mainly used to prevent direct contact between the housing 140 and the output shaft 120. This helps to reduce friction, heat generation, and wear between the housing 140 and the output shaft 120, thereby extending the service life of the housing 140 and the output shaft 120. The first support bearing 171 also supports the output shaft 120, making the rotation of the output shaft 120 smoother and ensuring the normal operation of the output shaft 120. The oil seal 180 mainly prevents coolant from leaking from the gap between the housing 140 and the output shaft 120, so that the coolant entering the mounting cavity 160 can effectively lubricate the first support bearing 171 and the oil seal 180, and to a certain extent avoid coolant loss. The oil seal 180 can also prevent dust, dirt, water, and other contaminants that may damage the first support bearing 171 from entering the interior of the first support bearing 171, extending the service life of the first support bearing 171 and ensuring its working performance to a certain extent.

[0148] In some embodiments, combination and Figure 3 and Figure 4 As shown, the oil seal 180 is located on the side of the first support bearing 171 away from the third cooling channel 133. On the one hand, this allows the first support bearing 171 to be positioned close to the third cooling channel 133, facilitating lubrication of the first support bearing 171 with coolant. On the other hand, the oil seal 180 also prevents leakage of coolant that enters the mounting cavity 160 to lubricate the first support bearing 171, avoiding coolant loss and improving lubrication efficiency.

[0149] In some embodiments, the first support bearing 171 is an open bearing, which facilitates lubrication of the first support bearing 171 with coolant and simplifies the structure of the first support bearing 171.

[0150] In some embodiments, such as Figure 4 As shown, the peripheral wall of the guide column 141 is provided with a through-hole 1411, which connects the mounting cavity 160 and the third cooling channel 133 respectively. This enables the connection between the mounting cavity 160 and the third cooling channel 133 and reduces the difficulty of connecting the mounting cavity 160 and the third cooling channel 133, thereby facilitating the delivery of coolant from the third cooling channel 133 to the mounting cavity 160.

[0151] It should be noted that, as Figure 6As shown, when the oil seal 180 is located between the first support bearing 171 and the third cooling channel 133, the first support bearing 171 is formed as a closed grease-lubricated bearing, so that the oil seal 180 can be lubricated by its own structure. At this time, the guide port 1411 does not need to be provided on the peripheral wall of the guide column 141. The leakage of the first seal 151 is mainly used to transport part of the coolant in the third cooling channel 133 to the mounting cavity 160, so as to lubricate the oil seal 180, reduce the friction between the oil seal 180 and the output shaft 120, and make the rotation of the output shaft 120 smoother.

[0152] Meanwhile, eliminating the flow inlet 1411 on the peripheral wall of the flow guide column 141 simplifies the structure of the flow guide column 141 and reduces the molding difficulty of the flow guide column 141.

[0153] Of course, in some other embodiments, when the oil seal 180 is located between the first support bearing 171 and the third cooling channel 133, a guide port 1411 can also be provided on the peripheral wall of the guide column 141 to deliver part of the coolant in the third cooling channel 133 to the mounting cavity 160, so as to lubricate the oil seal 180 and ensure the lubrication effect of the oil seal 180 to a certain extent.

[0154] In some embodiments, such as Figure 3 As shown, the motor 110 also includes a stator 113, which is sleeved on the outer periphery of the rotor 111 and coupled to the rotor 111. This allows the stator 113 to drive the rotor 111 to rotate, thereby facilitating the conversion of electrical energy provided by the battery 200 into mechanical energy by the motor 110, and ensuring the working performance of the drive device 100 to a certain extent.

[0155] The motor 110 in this application may be an axial flux motor, a radial flux motor, a servo motor, a brushed motor, or a brushless motor, etc., and no specific limitation is made here.

[0156] Optionally, combined Figure 3 and Figure 5 As shown, a third connecting port 1121 is provided on the peripheral wall of the rotor shaft 112, which connects to the second cooling channel 132. The third connecting port 1121 is used to supply coolant to the stator 113 and / or the rotor 111. This means that when the third connecting port 1121 is connected to the second cooling channel 132, coolant can be supplied to the stator 113 and / or the rotor 111 through the third connecting port 1121, thereby facilitating the cooling of the stator 113 and / or the rotor 111, reducing the temperature of the stator 113 and / or the rotor 111, ensuring the working performance of the stator 113 and / or the rotor 111 to a certain extent, and extending the service life of the stator 113 and / or the rotor 111.

[0157] Meanwhile, by providing a third through-hole 1121 on the peripheral wall of the rotor shaft 112 to cool the stator 113 and / or the rotor 111, compared with the prior art of setting a separate cooling channel to cool the stator 113 and / or the rotor 111, it can not only reduce the cooling difficulty of the stator 113 and / or the rotor 111, but also simplify the structure of the cooling channel 130, reduce the forming difficulty of the cooling channel 130, thereby reducing the assembly difficulty of the drive device 100 and improving the assembly efficiency.

[0158] In some embodiments, the third communication port 1121 is positioned radially opposite at least a portion of the stator winding 113 to facilitate the delivery of coolant toward the stator winding via the third communication port 1121, thereby facilitating the cooling of the stator winding and improving its performance while reducing the difficulty of cooling it.

[0159] Specifically, when the coolant enters between the output shaft 120 and the rotor shaft 112, the coolant moves toward both ends of the rotor shaft 112. When the coolant flows to the third connecting port 1121, a portion of the coolant can be delivered toward the stator winding through the third connecting port 1121 to achieve the purpose of cooling the stator winding.

[0160] In some embodiments, combined with Figure 3 and Figure 5 As shown, in the radial direction of the motor 110, the rotor 111 and the third connecting port 1121 are not directly opposite each other. This can also be understood as the rotor 111 and the third connecting port 1121 being arranged at intervals in the axial direction of the motor 110. Since the rotor 111 is located between the stator 113 and the third connecting port 1121 in the radial direction of the motor 110, this arrangement can, to a certain extent, prevent the rotor 111 from obstructing the delivery of coolant from the third connecting port 1121 to the stator 113. In other words, it allows some of the coolant in the second cooling channel 132 to be effectively output to the stator 113 through the third connecting port 1121, so as to facilitate the cooling of the stator 113 with coolant and reduce the cooling difficulty of the stator 113, thus ensuring the working performance of the stator 113 to a certain extent.

[0161] In some embodiments, combined with Figure 3 and Figure 5As shown, the third connecting port 1121 includes at least two, which are spaced apart along the axial direction of the rotor shaft 112. The distance between the at least two third connecting ports 1121 is greater than the axial length of the rotor 111. In the axial direction of the motor 110, the rotor 111 is positioned between two adjacent third connecting ports 1121. It can be understood that setting the distance between the at least two third connecting ports 1121 to be greater than the axial length of the rotor 111 ensures that after the rotor 111 is assembled, in the axial direction of the motor 110, the rotor 111 can be positioned between two adjacent third connecting ports 1121. This prevents the rotor 111 and the third connecting ports 1121 from being directly opposite each other in the radial direction of the motor 110, thereby avoiding the rotor 111 from obstructing the delivery of coolant from the third connecting ports 1121 to the stator 113 and reducing the cooling difficulty of the stator 113.

[0162] Meanwhile, by setting the third connection port 1121 to include at least two, the number of third connection ports 1121 can be increased. This is beneficial to use at least two third connection ports 1121 to cooperate in delivering more coolant toward the stator 113, thereby improving the cooling effect.

[0163] In other embodiments, at least one third communication port 1121 is disposed radially toward the rotor 111 (not shown in the example figure). This allows coolant to be delivered toward the rotor 111 via the third communication port 1121, thereby cooling the rotor 111.

[0164] In some embodiments, combined with Figure 3 and Figure 5 As shown, a second support bearing 172 is provided on the outer periphery of the rotor shaft 112 to support it. A fourth connecting port 1122 is provided on the peripheral wall of the rotor shaft 112, which is directly opposite the second support bearing 172 and connects to the second cooling channel 132. This allows at least a portion of the coolant in the second cooling channel 132 to be transported to the second support bearing 172 through the fourth connecting port 1122. This lubricates the second support bearing 172 with coolant, reduces friction between the second support bearing 172 and the rotor shaft 112, makes the rotation of the rotor shaft 112 smoother, and also helps to extend the service life of the second support bearing 172.

[0165] Meanwhile, by providing a second support bearing 172 on the outer periphery of the rotor shaft 112, the rotor shaft 112 can be supported by the second support bearing 172, while preventing direct contact between the rotor shaft 112 and the housing of the drive device 100. This helps to further reduce friction, heat generation and wear between the rotor shaft 112 and the housing of the drive device 100, thereby extending the service life of the rotor shaft 112 and the housing of the drive device 100.

[0166] It should be noted that the main purpose of using the second support bearing 172 to support the rotor shaft 112 is to make the rotation of the rotor shaft 112 smoother and ensure the normal operation of the rotor shaft 112.

[0167] In some embodiments, such as Figure 5 As shown, the fourth connecting port 1122 is provided on the peripheral wall of the rotor shaft 112 and extends obliquely along the axial direction of the rotor shaft 112, so that the fourth connecting port 1122 can be positioned directly opposite the second support bearing 172, thereby facilitating the delivery of coolant to the second support bearing 172 through the fourth connecting port 1122, and ensuring the delivery effect of coolant to a certain extent, thereby improving the lubrication effect on the second support bearing 172.

[0168] In some embodiments, the coolant is cooling oil. This allows for the use of coolant to lubricate the second support bearing 172 and ensures a certain level of lubrication effectiveness.

[0169] In some embodiments, the second support bearing 172 is an open bearing, which facilitates lubrication of the second support bearing 172 with coolant and simplifies the structure of the second support bearing 172.

[0170] With the above configuration, in a specific example, when the motor 110 needs cooling, external coolant can first be supplied to the third cooling channel 133. The coolant flows along the extension direction of the third cooling channel 133 as it enters. When the coolant flows to the guide port 1411 and the first seal 151, at least a portion of the coolant in the third cooling channel 133 can flow into the mounting cavity 160 to lubricate the first support bearing 171 and / or oil seal 180. Simultaneously, a portion of the coolant in the third cooling channel 133 continues to flow along the extension direction of the third cooling channel 133. When the coolant flows to the second connecting port 122, the coolant passes through the second connecting port 122... 2. The coolant is delivered to the first cooling channel 131. When the coolant enters the first cooling channel 131, it can flow along the extension direction of the first cooling channel 131. When the coolant flows to the first connecting port 121, the coolant is delivered to the second cooling channel 132 through the first connecting port 121, so as to deliver the coolant between the output shaft 120 and the rotor shaft 112. At the same time, since the first connecting port 121 is located near the axial center of the rotor shaft 112 and / or the first connecting port 121 is directly opposite the axial center of the rotor shaft 112, when the coolant enters between the output shaft 120 and the rotor shaft 112, the coolant can move towards the axial ends of the rotor shaft 112 under the action of centrifugal force, so as to cool the rotor shaft 112 and the rotor 111 using the coolant.

[0171] During the process of the coolant moving towards both ends of the rotor shaft 112, when the coolant flows to the third connecting port 1121, at least a portion of the coolant in the second cooling channel 132 can be transported to the stator winding through the third connecting port 1121 to achieve the purpose of cooling the stator winding. When the coolant flows to the fourth connecting port 1122, at least a portion of the coolant in the second cooling channel 132 can be transported to the second support bearing 172 through the fourth connecting port 1122 to achieve the purpose of lubricating the second support bearing 172.

[0172] Meanwhile, some of the coolant between the output shaft 120 and the rotor shaft 112 can be drained into the oil pan through the gap between the output shaft 120 and the rotor shaft 112.

[0173] In some embodiments, such as Figure 3 and Figure 6 As shown, the first cooling channel 131 extends along the axial direction of the output shaft 120, and the extension length of the first cooling channel 131 is less than the extension direction of the output shaft 120. In this way, while forming the first cooling channel 131 inside the output shaft 120, it can also avoid excessively reducing the structural strength of the output shaft 120 due to the opening of the first cooling channel 131, thereby extending the service life of the output shaft 120 and ensuring the working performance of the output shaft 120 to a certain extent.

[0174] In some embodiments, such as Figure 7 As shown, the first cooling channel 131 extends through the output shaft 120 along its axial direction. That is, it is not limited to setting the extension length of the first cooling channel 131 to be less than the extension direction of the output shaft 120; the extension length of the first cooling channel 131 can also be set to be equal to the extension direction of the output shaft 120, so that the first cooling channel 131 can extend through the output shaft 120 along its axial direction. This reduces the difficulty of forming the first cooling channel 131 and also allows some coolant to be directly delivered to the differential through the first cooling channel 131, providing active lubrication to the components of the differential that require lubrication, thus ensuring the differential's performance to a certain extent.

[0175] In some embodiments, such as Figure 7As shown, a second seal 152 is provided at each of the opposite ends of the first cooling channel 131. A through outlet 1521 is provided on the second seal 152 near the differential, connecting to the first cooling channel 131. The radial dimension of the outlet 1521 is smaller than the inner diameter of the first cooling channel 131. By providing second seals 152 at each of the opposite ends of the first cooling channel 131, the sealing effect of the first cooling channel 131 can be guaranteed to a certain extent, allowing the coolant entering the first cooling channel 131 to effectively enter the second cooling channel 132 through the first connecting port 121. This enables the coolant to be transported between the output shaft 120 and the rotor shaft 112 through the first cooling channel 131, achieving the purpose of cooling the motor 110.

[0176] Meanwhile, by providing an outlet 1521 that connects to the first cooling channel 131 on the second seal 152 near the differential, and setting the radial dimension of the outlet 1521 to be smaller than the inner diameter of the first cooling channel 131, some of the coolant in the first cooling channel 131 can be discharged through the outlet 1521. In this way, coolant can be delivered towards the differential through the outlet 1521 to provide active lubrication to the components of the differential that require lubrication, thereby ensuring the working performance of the differential to a certain extent.

[0177] It should be noted that the above can be understood as follows: when the first cooling channel 131 passes through the output shaft 120 along the axial direction of the output shaft 120, a second seal 152 is provided at both ends of the first cooling channel 131, and an outlet 1521 is provided on the second seal 152 near the differential so as to deliver part of the coolant in the first cooling channel 131 to the parts of the differential that need lubrication.

[0178] Among them, combined Figure 3 , Figure 5 and Figure 6 As shown, when the extension length of the first cooling channel 131 is less than the extension direction of the output shaft 120, the second seal 152 can be provided only on the side of the first cooling channel 131 near the housing 140, and the second seal 152 is located on the side of the second connection port 122 away from the first connection port 121. In this way, when the coolant in the third cooling channel 133 enters the first cooling channel 131 through the second connection port 122, it can prevent the coolant from flowing in the direction away from the first connection port 121 and overflowing to a certain extent. This allows the coolant entering the first cooling channel 131 to flow effectively to the first connection port 121, and then the coolant is transported to the second cooling channel 132 through the first connection port 121 to achieve the purpose of transporting the coolant between the output shaft 120 and the rotor shaft 112 to cool the motor 110.

[0179] In some embodiments, the second seal 152 is a sealing sheet or sealing plate, etc., and the second seal 152 is fixedly connected in the first cooling channel 131 to seal the first cooling channel 131.

[0180] In some embodiments, the second seal 152 is fixedly connected to the inner peripheral wall of the output shaft 120 by means of welding, bonding, snap-fitting or bolting, so as to fix the second seal 152 in the first cooling channel 131, which helps to improve the positional stability of the second seal 152 and thus improve the sealing effect of the second seal 152.

[0181] The vehicle 1000 of this application is described below with reference to the accompanying drawings.

[0182] like Figure 1 As shown, the vehicle 1000 of this application embodiment includes the drive device 100 of the above embodiment.

[0183] Since the drive device 100 of the present application embodiment has the above-mentioned technical effects, the vehicle 1000 of the present application embodiment also has the above-mentioned technical effects. That is, by adopting the drive device 100 of the present application, the heat dissipation effect of the drive device 100 of the vehicle 1000 can be improved to a certain extent, thereby ensuring the working performance of the vehicle 1000 to a certain extent.

[0184] It is understood that the specific structure and working principle of the drive device 100 and other components of the vehicle 1000 having it, such as the motor 110, reducer and differential, according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0185] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0186] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A driving device, characterized in that, include: Output shaft (120); The motor (110) has a rotor (111) and a rotor shaft (112). The rotor (111) is sleeved on the outer periphery of the rotor shaft (112). The rotor shaft (112) is hollow inside. The output shaft (120) is located inside the rotor shaft (112). A cooling channel (130) is provided, the cooling channel (130) being adapted to be filled with coolant, the cooling channel (130) including a first cooling channel (131) formed inside the output shaft (120) and a second cooling channel (132) formed between the output shaft (120) and the rotor shaft (112), the first cooling channel (131) and the second cooling channel (132) being connected through a first communication port (121) on the output shaft (120).

2. The driving device according to claim 1, characterized in that, The first communication port (121) is located near the axial center of the rotor shaft (112); and / or, the first communication port (121) is directly opposite the axial center of the rotor shaft (112).

3. The driving device according to claim 1 or 2, characterized in that, The first communication port (121) includes a plurality of ports, and the plurality of first communication ports (121) are arranged at circumferential intervals along the output shaft (120).

4. The driving device according to any one of claims 1-3, characterized in that, It also includes a housing (140), at least a portion of which extends out of the rotor shaft (112), the housing (140) being disposed on the outer periphery of the output shaft (120) to support the output shaft (120).

5. The driving device according to claim 4, characterized in that, The cooling channel (130) further includes a third cooling channel (133), which is located in the housing (140) and connects the external space of the housing (140) and the first cooling channel (131).

6. The driving device according to claim 5, characterized in that, The output shaft (120) has a second through port (122) on its peripheral wall, and the third cooling channel (133) is connected to the first cooling channel (131) through the second through port (122).

7. The driving device according to claim 6, characterized in that, The housing (140) has a guide column (141) disposed between the peripheral wall of the housing (140) and the output shaft (120). The guide column (141) is hollow inside to form the third cooling channel (133). The guide column (141) surrounds the outer periphery of the second communication port (122).

8. The driving device according to claim 7, characterized in that, A first seal (151) is provided between the flow guide column (141) and the output shaft (120).

9. The driving device according to claim 7 or 8, characterized in that, A mounting cavity (160) is formed between the peripheral wall of the housing (140) and the output shaft (120). A first support bearing (171) and an oil seal (180) are installed in the mounting cavity (160). The mounting cavity (160) is connected to the third cooling channel (133).

10. The driving device according to claim 9, characterized in that, The peripheral wall of the guide column (141) is provided with a guide port (1411) that penetrates it, and the guide port (1411) is connected to the mounting cavity (160) and the third cooling channel (133) respectively.

11. The driving device according to any one of claims 1-10, characterized in that, The motor (110) also includes a stator (113), which is sleeved on the outer periphery of the rotor (111) and is coupled to the rotor (111); The rotor shaft (112) has a third through port (1121) on its peripheral wall. The third through port (1121) is connected to the second cooling channel (132). The third through port (1121) is used to deliver the coolant toward the stator (113) and / or the rotor (111).

12. The driving device according to claim 11, characterized in that, In the radial direction of the motor (110), the rotor (111) is not directly opposite the third communication port (1121).

13. The driving device according to claim 12, characterized in that, The third communication port (1121) includes at least two, and the at least two third communication ports (1121) are arranged at an axial distance along the rotor shaft (112). The distance between the at least two third communication ports (1121) is greater than the axial length of the rotor (111). In the axial direction of the motor (110), the rotor (111) is located between two adjacent third communication ports (1121).

14. The driving device according to any one of claims 1-13, characterized in that, The rotor shaft (112) is provided with a second support bearing (172) on its outer periphery. The rotor shaft (112) is provided with a fourth connecting port (1122) that passes through it. The fourth connecting port (1122) is directly opposite the second support bearing (172) and is connected to the second cooling channel (132).

15. The driving device according to any one of claims 1-14, characterized in that, The first cooling channel (131) extends along the axial direction of the output shaft (120), and the extension length of the first cooling channel (131) is less than the extension direction of the output shaft (120).

16. The driving device according to any one of claims 1-14, characterized in that, The first cooling channel (131) extends through the output shaft (120) along the axial direction of the output shaft (120).

17. The driving device according to claim 16, characterized in that, The first cooling channel (131) is provided with a second seal (152) at both ends. The second seal (152) near the differential is provided with an outlet (1521) that passes through it. The outlet (1521) is connected to the first cooling channel (131). The radial dimension of the outlet (1521) is smaller than the inner diameter of the first cooling channel (131).

18. A vehicle, characterized in that, Includes the drive device according to any one of claims 1-17.

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