Wheel drive system and vehicle

Abstract

The application relates to the technical field of vehicles, in particular to a wheel-side driving system and a vehicle. The wheel-side driving system comprises a driving motor with a motor shaft, a transmission comprising an input shaft, an output shaft and a gear transmission mechanism connected between the input shaft and the output shaft, the input shaft and the output shaft being located on opposite sides of the transmission respectively, the input shaft being connected with the motor shaft, and the output shaft being configured to be connected with a wheel; the motor shaft, the input shaft and the output shaft are coaxially arranged; wherein the driving motor is an axial flux motor. In combination with the transmission, the mass and size are smaller under the condition of equal power output, which is beneficial to reducing the unsprung mass of the vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a wheel-side drive system and vehicle. Background Technology

[0002] With the development of vehicle technology, more and more vehicles are equipped with wheel-side drive systems. A wheel-side drive system is a distributed drive technology that places the drive motor directly near the vehicle's wheels, achieving efficient power output and flexible handling by independently controlling the motor of each drive wheel.

[0003] Currently, wheel-side drive systems include a drive motor and a transmission. The transmission has an input shaft and an output shaft. The input shaft of the transmission is connected to the motor shaft of the drive motor, and the output shaft of the transmission is connected to the vehicle's wheels. The drive motor drives the wheels to rotate through the transmission.

[0004] However, the wheel-side drive system occupies a large space in the radial direction of the motor shaft, and the wheel-side drive system results in a large unsprung mass of the vehicle. Utility Model Content

[0005] Based on this, this application provides a wheel-side drive system and vehicle to solve the problems in the related art where the wheel-side drive system occupies a large space in the radial direction of the motor shaft and results in a large unsprung mass of the vehicle.

[0006] In a first aspect, embodiments of this application provide a wheel-side drive system, including:

[0007] A drive motor, having a motor shaft;

[0008] The transmission includes an input shaft, an output shaft, and a gear transmission mechanism connecting the input shaft and the output shaft. The input shaft and the output shaft are located on opposite sides of the transmission. The input shaft is connected to a motor shaft, and the output shaft is configured to connect to a wheel.

[0009] The motor shaft, input shaft, and output shaft are arranged coaxially.

[0010] The drive motor is an axial flux motor, and the motor body is arranged radially on the motor shaft.

[0011] In one possible implementation, the transmission further includes a first drive shaft and a second drive shaft. The gear transmission mechanism includes a driving gear, a driven gear, a first transmission gear, a second transmission gear, and a planetary gear unit. The driving gear is mounted on the input shaft, the driven gear and the first transmission gear are respectively mounted on the first drive shaft, the driven gear meshes with the driving gear, and the second transmission gear is mounted on the second drive shaft and meshes with the first transmission gear. The second drive shaft and the output shaft are driven by the planetary gear unit.

[0012] The second drive shaft is arranged coaxially with the input shaft, and the first drive shaft is located on the same side as the second drive shaft and the input shaft.

[0013] In one possible implementation, there are at least two first drive shafts, which are evenly arranged around the axis of the second drive shaft, and each first drive shaft is provided with a driven gear and a first drive gear.

[0014] In one possible implementation, the driving gear includes a first driving gear and a second driving gear respectively mounted on the input shaft, and the driven gear includes a first driven gear and a second driven gear respectively mounted on the first transmission shaft;

[0015] A first shifting mechanism is mounted on the input shaft. The first shifting mechanism is configured to control the first driving gear to mesh with the first driven gear or to control the second driving gear to mesh with the second driven gear.

[0016] In one possible implementation, both the first driven gear and the second driven gear are located on the side of the first transmission gear facing the input shaft.

[0017] In one possible implementation, the first transmission gear includes a first transmission large gear and a first transmission small gear respectively mounted on the first transmission shaft, and the second transmission gear includes a second transmission large gear and a second transmission small gear respectively mounted on the second transmission shaft.

[0018] A second shifting mechanism is mounted on the first drive shaft. The second shifting mechanism is configured to control the engagement of the first large drive gear with the second small drive gear or to control the engagement of the first small drive gear with the second large drive gear.

[0019] In one possible implementation, the number of planetary gear units is at least two, and the at least two planetary gear units are arranged along the axial direction of the input shaft;

[0020] In two adjacent planetary gear units, a connecting shaft connects the planet carrier of one planetary gear unit to the sun gear of the other planetary gear unit;

[0021] The second drive shaft is connected to the sun gear of the planetary gear unit facing the input shaft, and the output shaft is connected to the planet carrier of the planetary gear unit facing away from the input shaft.

[0022] In one possible implementation, the driving gear, driven gear, first transmission gear, and second transmission gear are all helical gears.

[0023] In one possible implementation, the wheel-side drive system also includes a linkage, one end of which is connected to the output shaft via a universal joint, and the other end of which is connected to the wheel via a universal joint.

[0024] Secondly, embodiments of this application provide a vehicle including the aforementioned wheel-side drive system.

[0025] This application provides a wheel-side drive system and vehicle, which includes a drive motor and a transmission. The motor shaft of the drive motor is connected to the input shaft of the transmission, and the output shaft of the transmission is used to connect the wheels. The input and output shafts are connected via a gear transmission mechanism. The motor shaft, input shaft, and output shaft are coaxially arranged, and an axial flux motor is used as the drive motor, with the motor body arranged radially on the motor shaft. Compared to ordinary radial flux motors, axial flux motors have higher power density. For the same output power, using a low-speed, high-torque axial flux motor allows for a smaller transmission. The coaxial arrangement of the transmission's input and output shafts with the motor shaft further reduces the space occupied by the transmission radially on the motor shaft. This results in a smaller overall size and lower mass for the wheel-side drive system, which helps reduce the vehicle's unsprung mass. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a first wheel-side drive system provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of a second wheel-side drive system provided in an embodiment of this application;

[0029] Figure 3 A schematic diagram of a third wheel-side drive system provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of a fourth wheel-side drive system provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Drive motor; 110 - Motor shaft; 120 - Motor shaft;

[0033] 200 - Transmission; 210 - Input shaft; 220 - Output shaft; 230 - First drive shaft; 240 - Second drive shaft; 251 - Driving gear; 2511 - First driving gear; 2512 - Second driving gear; 252 - Driven gear; 2521 - First driven gear; 2522 - Second driven gear; 253 - First transmission gear; 2531 - First transmission large gear; 2532 - First transmission small gear; 254 - Second transmission gear; 2541 - Second transmission large gear; 2542 - Second transmission small gear; 255 - Planetary gear unit; 2551 - Sun gear; 2552 - Planet carrier; 261 - First shifting mechanism; 262 - Second shifting mechanism; 270 - Connecting rod; 280 - Universal joint; 290 - Connecting shaft;

[0034] 300 - Wheels. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction 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.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] The terms “first,” “second,” and “third” (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0039] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0040] In existing technology, wheel-side drive systems include a drive motor and a transmission. The transmission has an input shaft and an output shaft. The input shaft of the transmission is connected to the motor shaft of the drive motor, and the output shaft of the transmission is connected to the vehicle's wheels. The drive motor drives the wheels to rotate through the transmission. However, the power of the drive system is limited by its inability to meet the power requirements of the wheel-side components, and the excessive unsprung mass leads to significant vibration and impact. Currently, there are two types of wheel-side drive systems: one uses a high-torque, low-speed drive motor paired with a low-gear transmission. This solution has a relatively large drive motor mass, resulting in significant unsprung mass. The second type uses a conventional radial high-speed, low-torque drive motor paired with a multi-gear transmission. In this solution, the multi-gear transmission has a relatively large mass, which also increases unsprung mass. To reduce unsprung mass in the second solution, the motor shaft of the drive motor is offset from the output shaft of the transmission, allowing the drive motor to be positioned above the springs of the suspension structure. However, this results in the wheel-side drive system occupying a large amount of space radially on the motor shaft.

[0041] After repeated consideration and verification, the inventors discovered that by arranging the motor shaft of the drive motor coaxially with the output shaft of the transmission, the radial space occupied by the wheel-side drive system on the motor shaft can be reduced. Using an axial flux motor as the drive motor, compared to a conventional radial flux motor, the axial flux motor has a higher power density. At the same output power, a low-speed, high-torque axial flux motor can be paired with a smaller transmission. Simultaneously, the transmission losses are lower, and the transmission efficiency is higher. Thus, the entire wheel-side drive system has a smaller size and lower mass, which helps reduce the unsprung mass of the vehicle.

[0042] The technical solutions of the wheel-side drive system and vehicle provided in the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0043] Reference Figure 1As shown, the wheel-side drive system provided in this embodiment includes a drive motor 100 and a transmission 200. The drive motor 100 has a motor shaft 110. When the motor shaft 110 rotates, it can drive the vehicle wheels 300 to rotate via the transmission 200. The drive motor 100 can be arranged below the springs of the suspension structure, which is beneficial to improving the transmission efficiency of the wheel-side drive system.

[0044] The transmission 200 includes an input shaft 210, an output shaft 220, and a gear transmission mechanism connecting the input shaft 210 and the output shaft 220. The input shaft 210 and the output shaft 220 are located on opposite sides of the transmission 200. The input shaft 210 is connected to the motor shaft 110, and the output shaft 220 is configured to connect to the wheel 300.

[0045] Schematic illustration: The transmission 200 also includes a housing, within which a gear transmission mechanism can be arranged. The input shaft 210 and output shaft 220 extend from opposite sides of the housing. Optionally, the input shaft 210 can be connected to the motor shaft 110 via a flange or coupling, etc., without limitation. When the motor shaft 110 drives the input shaft 210 to rotate, the input shaft 210 can drive the output shaft 220 to rotate via the gear transmission mechanism, and the speed ratio between the input shaft 210 and the output shaft 220 can be set via the gear transmission mechanism. After the output shaft 220 is connected to the wheel 300, it can drive the wheel 300 to rotate relative to the vehicle body.

[0046] The motor shaft 110, input shaft 210, and output shaft 220 are arranged coaxially. Compared to the prior art where the motor shaft 110 and output shaft 220 are offset (parallel but not on the same axis), arranging the three shafts coaxially reduces the space occupied by the gear transmission mechanism in the radial direction of the motor shaft 110, and thus reduces the space occupied by the transmission 200 in the radial direction of the motor shaft 110.

[0047] The drive motor 100 is an axial flux motor, and its body 120 is arranged radially on the motor shaft 110. Those skilled in the art will understand that, compared to radial flux motors, axial flux motors have smaller weight and radial dimensions, and higher power density and torque. For the same output power, using a low-speed, high-torque axial flux motor allows for a smaller transmission 200, and the gears in the gear transmission mechanism can be relatively smaller, which is beneficial for improving the transmission efficiency of the wheel-side drive system.

[0048] The wheel-side drive system provided in this embodiment has its motor shaft 110, input shaft 210, and output shaft 220 arranged coaxially, and uses an axial flux motor as the drive motor 100. The body 120 of the drive motor 100 is arranged radially on the motor shaft 110. Compared with ordinary radial flux motors, axial flux motors have higher power density. Under the same output power, using a low-speed, high-torque axial flux motor allows for a smaller transmission 200. The input shaft 210 and output shaft 220 of the transmission 200 are arranged coaxially with the motor shaft 110, which also reduces the space occupied by the transmission 200 radially on the motor shaft 110. This results in a smaller size and lower mass for the entire wheel-side drive system, which is beneficial for reducing the unsprung mass of the vehicle. The transmission 200 is less prone to mechanical failures due to vibration. The wheel-side drive system provided in this embodiment can improve the NVH performance of the vehicle. The wheel-side drive system can balance unsprung mass and wheel-side power requirements, and is suitable for vehicles with high wheel-side power requirements, such as commercial vehicles.

[0049] In one embodiment, such as Figure 1 As shown, the transmission 200 also includes a first drive shaft 230 and a second drive shaft 240. The gear transmission mechanism includes a driving gear 251, a driven gear 252, a first transmission gear 253, a second transmission gear 254, and a planetary gear unit 255. The driving gear 251 is mounted on the input shaft 210, and the driven gear 252 and the first transmission gear 253 are respectively mounted on the first drive shaft 230. The driven gear 252 meshes with the driving gear 251.

[0050] Schematic illustration: the driving gear 251 is coaxially arranged with the input shaft 210, and the driven gear 252 and the first transmission gear 253 are coaxially arranged with the first transmission shaft 230. Along the axial direction of the first transmission shaft 230, there may be a gap between the driven gear 252 and the first transmission gear 253. When the motor shaft 110 drives the input shaft 210 to rotate, the input shaft 210 drives the first transmission shaft 230 to rotate through the meshing between the driving gear 251 and the driven gear 252, thereby driving the first transmission gear 253 on the first transmission shaft 230 to rotate.

[0051] The second transmission gear 254 is mounted on the second transmission shaft 240 and meshes with the first transmission gear 253. Schematic, the second transmission gear 254 is coaxially arranged with the second transmission shaft 240. When the first transmission shaft 230 rotates, the meshing between the first transmission gear 253 and the second transmission gear 254 drives the second transmission shaft 240 to rotate.

[0052] The second drive shaft 240 and the output shaft 220 are driven by a planetary gear unit. Schematic, the second drive shaft 240 is connected to the sun gear 2551 of the planetary gear unit 255, and the output shaft 220 is connected to the planet carrier 2552 of the planetary gear unit 255. The sun gear 2551 of the planetary gear unit 255 can be connected to the end of the second drive shaft 240 and is coaxially arranged with the second drive shaft 240. The planetary gear unit 255 also includes multiple planet gears and a ring gear. The multiple planet gears are arranged around the sun gear 2551, and each planet gear meshes with the sun gear 2551. The planet carrier 2552 of the planetary gear unit 255 is connected to each of the multiple planet gears, and the ring gear surrounds the outside of the multiple planet gears and meshes with each planet gear. When the second drive shaft 240 rotates, it can drive the sun gear 2551 of the planetary gear unit 255 to rotate, thereby driving the planet carrier 2552 of the planetary gear unit 255 and the output shaft 220 connected to the planet carrier 2552 to rotate. With the above settings, when the motor shaft 110 of the drive motor 100 can provide a large torque, the wheel-side drive system can meet the wheel-side power requirements of the vehicle.

[0053] The second drive shaft 240 is coaxially arranged with the input shaft 210, and the first drive shaft 230 is located on the same side as the second drive shaft 240 and the input shaft 210. The axis of the first drive shaft 230 is parallel to both the axis of the second drive shaft 240 and the axis of the input shaft 210. This arrangement allows the motor shaft 110 to be coaxial with the output shaft 220, reducing the space occupied by the transmission 200 in the radial direction of the motor shaft 110.

[0054] In a specific embodiment, such as Figure 1 As shown, there are at least two first drive shafts 230, and the at least two first drive shafts 230 are evenly arranged around the axis of the second drive shaft 240. The number of first drive shafts 230 can be two, three, or four, etc., and is not limited to one.

[0055] Each first drive shaft 230 is provided with a driven gear 252 and a first drive gear 253. That is to say, the driven gear 252 on each first drive shaft 230 meshes with the driving gear 251 on the motor shaft 110, and the first drive gear 253 on each first drive shaft 230 meshes with the second drive gear 254 on the second drive shaft 240.

[0056] With the above configuration, when the motor shaft 110 of the drive motor 100 rotates, the multiple first transmission shafts 230 can share the load, which helps to improve the service life of the transmission 200 and at the same time avoids the second transmission shaft 240 from being overloaded.

[0057] In a specific embodiment, such as Figure 1As shown, the driving gear 251 includes a first driving gear 2511 and a second driving gear 2512 respectively mounted on the input shaft 210, and the driven gear 252 includes a first driven gear 2521 and a second driven gear 2522 respectively mounted on the first transmission shaft 230. The first driving gear 2511 and the second driving gear 2512 are coaxial with the input shaft 210 and spaced apart along the axial direction of the input shaft 210, while the first driven gear 2521 and the second driven gear 2522 are coaxial with the first transmission shaft 230 and spaced apart along the axial direction of the first transmission shaft 230.

[0058] A first shifting mechanism 261 is mounted on the input shaft 210. The first shifting mechanism 261 is configured to control the meshing of the first driving gear 2511 with the first driven gear 2521 or to control the meshing of the second driving gear 2512 with the second driven gear 2522. The first shifting mechanism 261 can use commercially available shifting mechanisms. The first shifting mechanism 261 can achieve first and second gear switching, and can selectively link the input shaft 210 with the first driving gear 2511 and the second driving gear 2512.

[0059] Those skilled in the art will understand that the drive motor 100 transmits power to the vehicle through the transmission 200, and the torque of the drive motor 100 can be used to perform a first gear power transmission process through the first gear shift mechanism 261, or it can be used to perform a second gear power transmission process through the first gear shift mechanism 261.

[0060] The torque of the drive motor 100 is transmitted to the first gear through the first shifting mechanism 261 as follows: the motor shaft 110 of the drive motor 100 drives the input shaft 210 to rotate, the input shaft 210 drives the first drive gear 2511 to rotate, the first drive gear 2511 drives the first driven gear 2521 to rotate, the first driven gear 2521 drives the first transmission shaft 230 to rotate, the first transmission shaft 230 drives the first transmission gear 253 to rotate, the first transmission gear 253 drives the second transmission gear 254 to rotate, the second transmission gear 254 drives the second transmission shaft 240 to rotate, the second transmission shaft 240 drives the sun gear 2551 of the planetary gear unit 255 to rotate, the sun gear 2551 drives the planet carrier 2552 of the planetary gear unit 255 to rotate, the planet carrier 2552 drives the output shaft 220 to rotate, and the output shaft 220 drives the wheel 300 to rotate.

[0061] The torque of the drive motor 100 is transmitted to the second gear through the first shifting mechanism 261 as follows: the motor shaft 110 of the drive motor 100 drives the input shaft 210 to rotate, the input shaft 210 drives the second drive gear 2512 to rotate, the second drive gear 2512 drives the second driven gear 2522 to rotate, the second driven gear 2522 drives the first transmission shaft 230 to rotate, the first transmission shaft 230 drives the first transmission gear 253 to rotate, the first transmission gear 253 drives the second transmission gear 254 to rotate, the second transmission gear 254 drives the second transmission shaft 240 to rotate, the second transmission shaft 240 drives the sun gear 2551 of the planetary gear unit 255 to rotate, the sun gear 2551 drives the planet carrier 2552 of the planetary gear unit 255 to rotate, the planet carrier 2552 drives the output shaft 220 to rotate, and the output shaft 220 drives the wheel 300 to rotate.

[0062] With the above settings, two different speed ratios can be achieved between the motor shaft 110 and the output shaft 220 of the drive motor 100, and the wheel-side drive system can meet different wheel-side power requirements, enabling the vehicle to cope with more usage scenarios.

[0063] In one specific implementation, such as Figure 1 As shown, the first driven gear 2521 and the second driven gear 2522 are both located on the side of the first transmission gear 253 facing the input shaft 210.

[0064] Figure 1 As shown, both the first drive gear 2511 and the second drive gear 2512 are located on the side of the second transmission gear 254 facing the motor shaft 110. The portion of the second transmission shaft 240 on which the second transmission gear 254 is located does not extend between the first drive gear 2511 and the second drive gear 2512, thus avoiding interference between the input shaft 210 and the second transmission shaft 240 and improving the reliability of the transmission 200. Schematic, there is a gap between the input shaft 210 and the second transmission shaft 240 in the axial direction of the second transmission shaft 240.

[0065] In one possible implementation, such as Figure 2 As shown, the first transmission gear 253 includes a first transmission large gear 2531 and a first transmission small gear 2532 respectively mounted on the first transmission shaft 230, and the second transmission gear 254 includes a second transmission large gear 2541 and a second transmission small gear 2542 respectively mounted on the second transmission shaft 240.

[0066] The first transmission large gear 2531 and the first transmission small gear 2532 are coaxial with the first transmission shaft 230 and are spaced apart along the axial direction of the first transmission shaft 230, and the second transmission large gear 2541 and the second transmission small gear 2542 are coaxial with the second transmission shaft 240 and are spaced apart along the axial direction of the second transmission shaft 240.

[0067] A second shifting mechanism 262 is mounted on the first drive shaft 230. The second shifting mechanism 262 is configured to control the first drive gear 2531 to mesh with the second drive gear 2542 or to control the first drive gear 2532 to mesh with the second drive gear 2541.

[0068] The structure of the second shifting mechanism 262 can be the same as that of the first shifting mechanism 261. The second shifting mechanism 262 can achieve two different speed ratios between the first drive shaft 230 and the second drive shaft 240 by controlling the meshing of the first large drive gear 2531 with the second small drive gear 2542 or by controlling the meshing of the first small drive gear 2532 with the second large drive gear 2541.

[0069] With the above settings, four different speed ratios can be achieved between the motor shaft 110 and the output shaft 220 of the drive motor 100, enabling the vehicle to cope with more usage scenarios.

[0070] In one embodiment, such as Figure 3 As shown, the number of planetary gear units 255 is at least two, and at least two planetary gear units 255 are arranged along the axial direction of the input shaft 210. Specifically, the number of planetary gear units 255 can be two, three, or four, etc., and is not limited to one.

[0071] In two adjacent planetary gear units 255, a connecting shaft 290 connects the planet carrier 2552 of one planetary gear unit 255 to the sun gear 2551 of the other planetary gear unit 255. The connecting shaft 290 is coaxially arranged with the motor shaft 110. The end of the connecting shaft 290 facing the motor shaft 110 is connected to the planet carrier 2552 of one planetary gear unit 255, and the end of the connecting shaft 290 away from the motor shaft 110 is connected to the sun gear 2551 of the other planetary gear unit 255.

[0072] The second drive shaft 240 is connected to the sun gear 2551 of the planetary gear unit 255 facing the input shaft 210, and the output shaft 220 is connected to the planet carrier 2552 of the planetary gear unit 255 facing away from the input shaft 210.

[0073] With this structure, the wheel-side drive system can achieve a large transmission ratio through at least two planetary gear units 255. The shared load-bearing capacity and impact resistance of the wheel-side drive system are improved by having at least two planetary gear units 255 share the load.

[0074] In one possible implementation, the driving gear 251, the driven gear 252, the first transmission gear 253, and the second transmission gear 254 are all helical gears.

[0075] Those skilled in the art will understand that the meshing between the driving gear 251 and the driven gear 252, as well as the meshing between the first transmission gear 253 and the second transmission gear 254, is smoother, resulting in less noise when the motor shaft 110 of the drive motor 100 drives the output shaft 220 to rotate via the transmission 200. Compared to a configuration where the driving gear 251, driven gear 252, first transmission gear 253, and second transmission gear 254 are spur gears, the transmission 200 has a higher load-bearing capacity.

[0076] In one embodiment, such as Figure 4 As shown, the wheel-side drive system also includes a connecting rod 270, one end of which is connected to the output shaft 220 via a universal joint 280, and the other end of which is connected to the wheel 300 via a universal joint 280.

[0077] This embodiment does not limit the specific structure of the universal joint 280. Those skilled in the art can select a suitable universal joint 280 or use an existing universal joint 280 on the market as needed.

[0078] In this embodiment, when the vehicle is traveling on uneven roads or turning, the universal joint 280 can compensate for the angular changes between the output shaft 220 and the wheel 300 caused by the movement of the suspension structure. It can also compensate for the slight length changes of the output shaft 220 caused by the extension and retraction of the suspension when the vehicle is bumpy. This ensures smooth, continuous, and reliable power transmission between the drive motor 100 and the wheel 300.

[0079] This application also provides a vehicle including the aforementioned wheel-side drive system.

[0080] The vehicle provided in this application, due to the adoption of the aforementioned wheel-side drive system, occupies less space in the radial direction of the motor shaft 110, resulting in higher space utilization. Simultaneously, the vehicle has lower unsprung mass, leading to improved handling, stability, and ride comfort. Furthermore, the transmission 200 of the wheel-side drive system is less prone to mechanical failures due to vibration.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A wheel-side drive system, characterized in that, include: A drive motor, having a motor shaft; A transmission includes an input shaft, an output shaft, and a gear transmission mechanism connecting the input shaft and the output shaft, the input shaft and the output shaft being located on opposite sides of the transmission, the input shaft being connected to the motor shaft, and the output shaft being configured to connect to a wheel; The motor shaft, the input shaft, and the output shaft are arranged coaxially; The drive motor is an axial flux motor, and the motor body is arranged radially on the motor shaft.

2. The wheel-side drive system according to claim 1, characterized in that, The transmission further includes a first drive shaft and a second drive shaft. The gear transmission mechanism includes a driving gear, a driven gear, a first transmission gear, a second transmission gear, and a planetary gear unit. The driving gear is mounted on the input shaft. The driven gear and the first transmission gear are respectively mounted on the first drive shaft. The driven gear meshes with the driving gear. The second transmission gear is mounted on the second drive shaft and meshes with the first transmission gear. The second drive shaft and the output shaft are connected by the planetary gear unit; The second drive shaft is arranged coaxially with the input shaft, and the first drive shaft is located on the same side as the second drive shaft and the input shaft.

3. The wheel-side drive system according to claim 2, characterized in that, The number of the first drive shafts is at least two, and the at least two first drive shafts are evenly arranged around the axis of the second drive shaft. Each first drive shaft is provided with a driven gear and a first drive gear.

4. The wheel-side drive system according to claim 2, characterized in that, The driving gear includes a first driving gear and a second driving gear respectively mounted on the input shaft, and the driven gear includes a first driven gear and a second driven gear respectively mounted on the first transmission shaft; A first shifting mechanism is mounted on the input shaft. The first shifting mechanism is configured to control the first driving gear to mesh with the first driven gear or to control the second driving gear to mesh with the second driven gear.

5. The wheel-side drive system according to claim 4, characterized in that, Both the first driven gear and the second driven gear are located on the side of the first transmission gear facing the input shaft.

6. The wheel-side drive system according to claim 4, characterized in that, The first transmission gear includes a first transmission large gear and a first transmission small gear respectively mounted on the first transmission shaft, and the second transmission gear includes a second transmission large gear and a second transmission small gear respectively mounted on the second transmission shaft; A second shifting mechanism is mounted on the first drive shaft. The second shifting mechanism is configured to control the first large drive gear to mesh with the second small drive gear or to control the first small drive gear to mesh with the second large drive gear.

7. The wheel-side drive system according to claim 2, characterized in that, The number of planetary gear units is at least two, and at least two planetary gear units are arranged along the axial direction of the input shaft; In two adjacent planetary gear units, a connecting shaft connects the planet carrier of one planetary gear unit to the sun gear of the other planetary gear unit; The second drive shaft is connected to the sun gear of the planetary gear unit facing the input shaft, and the output shaft is connected to the planet carrier of the planetary gear unit facing away from the input shaft.

8. The wheel-side drive system according to claim 2, characterized in that, The driving gear, the driven gear, the first transmission gear, and the second transmission gear are all helical gears.

9. The wheel-side drive system according to any one of claims 1-8, characterized in that, The wheel-side drive system also includes a connecting rod, one end of which is connected to the output shaft via a universal joint, and the other end of which is connected to the wheel via a universal joint.

10. A vehicle, characterized in that, The wheel-side drive system includes any one of claims 1-9.

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