Double-motor electric driving device and vehicle

Abstract

The utility model provides a double-motor electric drive device and a vehicle, and relates to the technical field of vehicle parts, the double-motor electric drive device comprises two motors, two planet row mechanisms and two half shafts; the planet row mechanism comprises a planet carrier, a sun gear, a plurality of first-stage planet gears, a plurality of second-stage planet gears, a first-stage inner gear ring and a second-stage inner gear ring, one of the planet carrier and the first-stage inner gear ring is configured as a fixing piece, each first-stage planet gear is meshed with the sun gear and the first-stage inner gear ring, and each second-stage planet gear is meshed with the second-stage inner gear ring; sun gears of the two planet row mechanisms are in transmission connection with motor shafts of the two motors respectively, and secondary inner gear rings of the two planet row mechanisms are in transmission connection with the two half shafts respectively. In this way, the torque output by the motor is transmitted to the half shaft through the duplex planet row structure, so that the speed ratio and efficiency of the electric driving device are improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, and more specifically, to a dual-motor electric drive device and a vehicle. Background Technology

[0002] Currently, electric drive systems on the market typically employ a parallel shaft structure, using a parallel shaft reduction mechanism to transmit the torque output from the motor. Due to space constraints within the vehicle, the speed ratio of the parallel shaft design is relatively small, resulting in a higher peak torque requirement from the motor when the entire electric drive system needs to output more torque. To achieve a higher speed ratio, electric drive systems using the parallel shaft design require multi-stage transmission, but this leads to a decrease in the overall system efficiency. Utility Model Content

[0003] The problem this invention addresses is: how to improve the speed ratio and efficiency of an electric drive system.

[0004] To solve the above problems, this utility model provides a dual-motor electric drive device and vehicle.

[0005] In the first aspect, this utility model provides a dual-motor electric drive device, including two motors, two planetary gear mechanisms, and two half-shafts;

[0006] The planetary gear mechanism includes a planet carrier, a sun gear, multiple first-stage planetary gears, multiple second-stage planetary gears, a first-stage internal gear ring, and a second-stage internal gear ring. One of the planet carrier and the first-stage internal gear ring is configured as a fixed component. The multiple first-stage planetary gears and the multiple second-stage planetary gears are arranged on the planet carrier and are arranged in a one-to-one correspondence. The corresponding first-stage planetary gears and second-stage planetary gears are coaxially connected. Each first-stage planetary gear meshes with the sun gear and the first-stage internal gear ring, and each second-stage planetary gear meshes with the second-stage internal gear ring.

[0007] The sun gears of the two planetary gear sets are respectively connected to the motor shafts of the two motors, and the secondary internal gear rings of the two planetary gear sets are respectively connected to the two half-shafts.

[0008] Optionally, the dual-motor electric drive device further includes a coupling mechanism disposed between the two motors for connecting or separating the motor shafts of the two motors.

[0009] Optionally, the dual-motor electric drive device further includes a housing, in which the motor, the planetary gear mechanism, the half-shaft and the coupling mechanism are all disposed, and the primary internal gear ring is fixedly connected to the housing, and the planetary carrier is rotatably connected to the housing.

[0010] Optionally, the first-stage planetary gear includes a first-stage planetary gear body and a first-stage planetary shaft. The first-stage planetary gear body is sleeved outside the first-stage planetary shaft and is drivenly connected to the first-stage planetary shaft. The second-stage planetary gear includes a second-stage planetary gear body and a second-stage planetary shaft. The second-stage planetary gear body is sleeved outside the second-stage planetary shaft and is drivenly connected to the second-stage planetary shaft. The first-stage planetary gear body and the second-stage planetary gear body are integrally connected, and / or the first-stage planetary shaft and the second-stage planetary shaft are integrally connected.

[0011] Optionally, the number of teeth on the first-stage planetary gear body is greater than the number of teeth on the second-stage planetary gear body.

[0012] Optionally, the outer diameter of the first-stage planetary gear body is larger than the outer diameter of the second-stage planetary gear body.

[0013] Optionally, the planetary carrier is connected to the housing and the secondary internal gear ring at both ends along its axial direction via a first bearing and a second bearing, respectively.

[0014] Optionally, the motor shaft of the motor is integrally connected to the sun gear of the corresponding planetary gear mechanism, and / or, the half shaft and the corresponding secondary internal gear ring are connected by a spline structure.

[0015] Optionally, the engagement mechanism is one of an electromagnetic clutch, a multi-mode clutch, a dog clutch, and a synchronizer.

[0016] Secondly, this utility model provides a vehicle including the dual-motor electric drive device described above.

[0017] The beneficial effects of the dual-motor electric drive device of this utility model are as follows: by setting two motors, two planetary gear mechanisms, and two half-shafts, and by connecting the sun gears of the two planetary gear mechanisms to the motor shafts of the two motors respectively, and connecting the secondary internal gear rings of the two planetary gear mechanisms to the two half-shafts respectively, the left drive wheel and the right drive wheel of the vehicle can each be driven by one motor, thereby increasing the torque of the drive wheels. In this way, the dual-motor electric drive device can meet the usage requirements of high torque conditions and improve the off-road capability of the vehicle. Meanwhile, by configuring the planetary gear set mechanism to include a planet carrier, a sun gear, multiple first-stage planetary gears, multiple second-stage planetary gears, a first-stage internal gear ring, and a second-stage internal gear ring, the planetary gear set mechanism is essentially a double planetary gear set structure. Compared to the traditional parallel shaft reduction mechanism used to transmit torque, transmitting the torque output from the motor to the half-shaft through a double planetary gear set structure can improve the speed ratio and efficiency of the dual-motor electric drive device, and can also effectively reduce the size of the dual-motor electric drive device, improving the flexibility of the device's layout on the vehicle. Moreover, by configuring one of the planet carrier and the first-stage internal gear ring as a fixed component, it is ensured that the first-stage planetary gears can rotate around their own axes or rotate around their own axes while simultaneously rotating around the axis of the sun gear. By setting multiple first-stage planetary gears and multiple second-stage planetary gears on the planet carrier and arranging them one-to-one, and The corresponding first-stage and second-stage planetary gears are coaxially connected, allowing each second-stage planetary gear to rotate around its own axis along with the corresponding first-stage planetary gear, or to rotate around its own axis while simultaneously rotating around the axis of the sun gear. By meshing each first-stage planetary gear with the sun gear and the first-stage internal gear ring, and each second-stage planetary gear with the second-stage internal gear ring, the torque transmitted to the sun gear is sequentially transmitted through the first-stage planetary gears, second-stage planetary gears, and second-stage internal gear ring to the half-shaft, and then to the corresponding drive wheel, thus propelling the vehicle. Furthermore, connecting the second-stage internal gear rings of the two planetary gear sets to the two half-shafts respectively, with the second-stage internal gear ring having a much larger number of teeth than the sun gear, serves as the output end of the double planetary gear set structure to output torque to the half-shafts. This allows for a larger speed ratio, further increasing the output torque and power of the device. Additionally, the dual-motor electric drive eliminates the traditional differential structure, allowing for further reduction in the overall size and weight of the dual-motor electric drive, which not only reduces production costs but also decreases energy consumption, improving the efficiency of the electric drive system. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the dual-motor electric drive device in an embodiment of the present invention.

[0019] Figure 2 This is a partial cross-sectional view of the dual-motor electric drive device at the planetary gear mechanism in an embodiment of this utility model.

[0020] Figure 3This is a schematic diagram illustrating the principle of the dual-motor electric drive device in the embodiment of this utility model when the engagement mechanism is separated;

[0021] Figure 4 This is a schematic diagram of the power transmission route of the dual-motor electric drive device in this embodiment of the invention when the engagement mechanism is separated.

[0022] Figure 5 This is a schematic diagram illustrating the principle of the dual-motor electric drive device in the engagement mechanism during engagement, as described in this utility model embodiment.

[0023] Figure 6 This is a schematic diagram of the power transmission route of the dual-motor electric drive device in the embodiment of this utility model when the engagement mechanism is engaged.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Motor; 11. Motor shaft; 12. Rotor; 13. Stator; 2. Planetary gear mechanism; 21. Planet carrier; 22. Sun gear; 23. First-stage planetary gear; 231. First-stage planetary gear body; 232. First-stage planetary shaft; 24. Second-stage planetary gear; 241. Second-stage planetary gear body; 242. Second-stage planetary shaft; 25. First-stage internal gear ring; 26. Second-stage internal gear ring; 3. Half shaft; 4. Engagement mechanism; 5. First bearing; 6. Second bearing; 7. Third bearing; 8. Fourth bearing. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0027] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0028] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0029] In related technologies, electric drive systems typically employ a parallel-shaft structure, using a parallel-shaft reduction mechanism to transmit the torque output from the motor. Due to space constraints within the vehicle, the speed ratio of the parallel-shaft scheme is relatively small, resulting in a higher peak torque requirement from the motor when the entire electric drive system needs to output more torque. To achieve a higher speed ratio, electric drive systems using the parallel-shaft scheme require multi-stage transmission, but this leads to a decrease in the overall system efficiency.

[0030] To address the problems existing in the aforementioned related technologies, this utility model provides a dual-motor electric drive device and vehicle.

[0031] Combination Figure 1 , Figures 3 to 6 As shown, the present invention provides a dual-motor electric drive device (hereinafter referred to as electric drive device), which includes two motors 1, two planetary gear mechanisms 2 and two half-shafts 3;

[0032] The planetary gear mechanism 2 includes a planet carrier 21, a sun gear 22, multiple first-stage planetary gears 23, multiple second-stage planetary gears 24, a first-stage internal gear ring 25, and a second-stage internal gear ring 26. One of the planet carrier 21 and the first-stage internal gear ring 25 is configured as a fixed member. The multiple first-stage planetary gears 23 and the multiple second-stage planetary gears 24 are arranged on the planet carrier 21 and are arranged in a corresponding manner. The corresponding first-stage planetary gears 23 and second-stage planetary gears 24 are coaxially connected. Each first-stage planetary gear 23 meshes with the sun gear 22 and the first-stage internal gear ring 25, and each second-stage planetary gear 24 meshes with the second-stage internal gear ring 26.

[0033] The sun gears 22 of the two planetary gear sets 2 are respectively connected to the motor shafts 11 of the two motors 1, and the secondary internal gear rings 26 of the two planetary gear sets 2 are respectively connected to the two half shafts 3.

[0034] It should be noted that for vehicles with front wheels as drive wheels, the dual-motor electric drive unit can be installed at the front axle; for vehicles with rear wheels as drive wheels, the dual-motor electric drive unit can be installed at the rear axle; and for vehicles with both front and rear wheels as drive wheels, one dual-motor electric drive unit can be installed at both the front and rear axles.

[0035] Specifically, the two motors 1 can be referred to as the left motor and the right motor, the two planetary gear mechanisms can be referred to as the left planetary gear mechanism and the right planetary gear mechanism, and the two half-shafts 3 can be referred to as the left half-shaft and the right half-shaft. The motor shaft 11 of the left motor is driven by the input end (i.e., the sun gear 22) of the left planetary gear mechanism, and the output end (i.e., the second-stage internal gear ring 26) of the left planetary gear mechanism is driven by the left half-shaft. The left half-shaft is used to connect with the left drive wheel to transmit the power output from the left motor to the left drive wheel. The motor shaft 11 of the right motor is driven by the input end (i.e., the sun gear 22) of the right planetary gear mechanism, and the output end (i.e., the second-stage internal gear ring 26) of the right planetary gear mechanism is driven by the right half-shaft. The right half-shaft is used to connect with the right drive wheel to transmit the power output from the right motor to the right drive wheel.

[0036] More specifically, the motor 1 includes a motor shaft 11, a rotor 12, and a stator 13. One end of the motor shaft 11 is connected to the input end (i.e., the sun gear 22) of the corresponding planetary gear set mechanism 2. The torque generated by the rotor 12 is transmitted to the motor shaft 11 for power output. The planetary gear set mechanism 2 is a double planetary gear set structure, which includes a planet carrier 21, a sun gear 22, multiple first-stage planetary gears 23, multiple second-stage planetary gears 24, a first-stage internal gear ring 25, and a second-stage internal gear ring 26. The sun gear 22 is drivenly connected to the motor shaft 11 of the corresponding motor 1. The multiple first-stage planetary gears 23 and multiple second-stage planetary gears 24 are all mounted on the planet carrier 21. The multiple first-stage planetary gears 23 are spaced apart circumferentially along the sun gear 22 and mesh with the sun gear 22 respectively. At the same time, the multiple first-stage planetary gears 23 also mesh with the first-stage internal gear ring 25 respectively. The number of planetary gears 24 is the same, and they are arranged in a one-to-one correspondence. The corresponding first-stage planetary gears 23 and second-stage planetary gears 24 are coaxially connected, allowing each second-stage planetary gear 24 to rotate around its own axis along with the corresponding first-stage planetary gear 23, or to rotate around its own axis while simultaneously rotating around the axis of the sun gear 22. Multiple second-stage planetary gears 24 mesh with second-stage internal gear rings 26, which are respectively connected to their corresponding half-shafts 3. Furthermore, one of the planet carrier 21 and the first-stage internal gear ring 25 is configured as a fixed component, meaning that one of the planet carrier 21 or the first-stage internal gear ring 25 is fixed or does not rotate. For example… Figures 3 to 6The example given is where the first-stage internal gear ring 25 is a fixed component. In this case, the first-stage planetary gear 23 rotates around its own axis while simultaneously driving the planet carrier 21 to rotate around the axis of the sun gear 22. In other examples, the planet carrier 21 can also be a fixed component. In this case, the first-stage planetary gear 23 rotates around its own axis while simultaneously driving the first-stage internal gear ring 25 to rotate around the axis of the sun gear 22. For ease of description, the motor 1, planetary gear set 2, and half-shaft 3, which are connected in sequence, are considered as a single drive assembly. In this drive assembly, the torque generated by the motor 1 is transmitted sequentially through the motor shaft 11, sun gear 22, first-stage planetary gear 23, second-stage planetary gear 24, and second-stage internal gear ring 26 to the half-shaft 3, and then to the corresponding drive wheels, thereby enabling the vehicle to move.

[0037] In this embodiment, the dual-motor electric drive device can be configured with two motors 1, two planetary gear sets 2, and two half-shafts 3. The sun gears 22 of the two planetary gear sets 2 are respectively connected to the motor shafts 11 of the two motors 1, and the secondary internal gear rings 26 of the two planetary gear sets 2 are respectively connected to the two half-shafts 3. This allows the left and right drive wheels of the vehicle to be driven by one motor 1, thereby increasing the torque of the drive wheels. As a result, the dual-motor electric drive device can meet the usage requirements of high torque conditions and improve the off-road capability of the vehicle. Meanwhile, by configuring the planetary gear set 2 to include a planet carrier 21, a sun gear 22, multiple first-stage planetary gears 23, multiple second-stage planetary gears 24, a first-stage internal gear ring 25, and a second-stage internal gear ring 26, the planetary gear set 2 is essentially a double planetary gear set structure. Compared with the traditional parallel shaft reduction mechanism for transmitting torque, transmitting the torque output by the motor 1 to the half-shaft 3 through the double planetary gear set structure can improve the speed ratio and efficiency of the dual-motor electric drive device, and can also effectively reduce the size of the dual-motor electric drive device, improving the flexibility of the device's layout on the vehicle. Moreover, by configuring one of the planet carrier 21 and the first-stage internal gear ring 25 as a fixed component, it is ensured that the first-stage planetary gear 23 can rotate around its own axis or rotate around its own axis while simultaneously rotating around the axis of the sun gear 22. By setting multiple first-stage planetary gears 23 and multiple second-stage planetary gears 24 on the planet carrier 21 and correspondingly setting them one by one, and by setting the corresponding... The first-stage planetary gear 23 and the second-stage planetary gear 24 are coaxially connected, allowing each second-stage planetary gear 24 to rotate around its own axis along with the corresponding first-stage planetary gear 23, or to rotate around its own axis while simultaneously rotating around the axis of the sun gear 22. By meshing each first-stage planetary gear 23 with the sun gear 22 and the first-stage internal gear ring 25, and each second-stage planetary gear 24 with the second-stage internal gear ring 26, the torque transmitted to the sun gear 22 can be sequentially transmitted through the first-stage planetary gear 23, the second-stage planetary gear 24, and the second-stage internal gear ring 26 to the half-shaft 3, and then to the corresponding drive wheel, thus enabling the vehicle to move. Furthermore, by connecting the second-stage internal gear rings 26 of the two planetary gear sets 2 to the two half-shafts 3 respectively, the second-stage internal gear ring 26, which has a much larger number of teeth than the sun gear 22, serves as the output end of the double planetary gear set structure to output torque to the half-shafts 3, thereby achieving a larger speed ratio and further improving the output torque and power of the device. In addition, the dual-motor electric drive eliminates the traditional differential structure, which allows for a further reduction in the size and weight of the entire dual-motor electric drive. This not only reduces production costs but also decreases energy consumption and improves the efficiency of the electric drive system.

[0038] Optionally, combined Figure 1 , Figures 3 to 6 As shown, the dual-motor electric drive device also includes a coupling mechanism 4, which is disposed between the two motors 1 and is used to connect or separate the motor shafts 11 of the two motors 1.

[0039] Specifically, one end of the motor shaft 11 is connected to the coupling mechanism 4, and the other end is connected to the input end (i.e., the sun gear 22) of the corresponding planetary gear mechanism 2. The motor shafts 11 of the two motors 1 can be connected and separated under the action of the coupling mechanism 4. When the vehicle is driving normally, such as Figure 3 and Figure 4 As shown ( Figure 4 (The blue and red arrows in the diagram represent the power transmission routes of the left and right motors, respectively.) With the engagement mechanism 4 in the disconnected state, the motor shafts 11 of the two motors 1 are separated. At this time, the power output from the left motor is transmitted sequentially to the left drive wheel via the left planetary gear set and the left half-shaft, and the power output from the right motor is transmitted sequentially to the right drive wheel via the right planetary gear set and the right half-shaft. When one drive wheel slips, the engagement mechanism 4 can connect the motor shafts 11 of the two motors 1, allowing the motor 1 driving the slipping drive wheel to transmit power to the motor shaft 11 of the other motor 1, and then via the planetary gear set 2 and the half-shaft 3 to the drive wheel that is not slipping. This increases the torque of the drive wheel that is not slipping, thereby helping the vehicle to get out of trouble. For example... Figure 5 and Figure 6 As shown ( Figure 6 The blue and red arrows in the diagram represent the power transmission routes of the left and right motors, respectively. When the left drive wheel slips, the engagement mechanism 4 can be switched to the engagement state to connect the motor shafts 11 of the two motors 1. This allows the torque output by the left motor to be transmitted to the motor shaft 11 of the right motor via the engagement mechanism 4, and then to the right drive wheel via the right planetary gear mechanism and the right half-shaft, thus helping the vehicle get out of trouble.

[0040] In this optional embodiment, by providing a coupling mechanism 4 between the motor shafts 11 of the two motors 1, the motor shafts 11 of the two motors 1 can be connected and separated under the action of the coupling mechanism 4. In this way, when one drive wheel of the vehicle slips, the coupling mechanism 4 can be used to connect the motor shafts 11 of the two motors 1, so that the motor 1 driving the slipping drive wheel can transmit torque to the motor shaft 11 of the other motor 1, and then transmit it to the drive wheel that has not slipped through the planetary gear mechanism 2 and the half shaft 3, thereby increasing the torque of the drive wheel that has not slipped, thereby helping the vehicle to get out of trouble.

[0041] Optionally, the engagement mechanism 4 can be one of an electromagnetic clutch, a multi-mode clutch, a dog clutch, and a synchronizer. An electromagnetic clutch engages and disengages using electromagnetic force, resulting in rapid operation and suitability for scenarios requiring frequent switching (e.g., real-time power distribution). It eliminates the need for traditional mechanical linkages, reducing energy transmission loss and system complexity. A synchronizer uses friction synchronization rings to pre-match rotational speeds, reducing impact and wear during engagement and extending component lifespan. However, it requires a certain operating time, has a slower response speed than an electromagnetic clutch, and is relatively complex and expensive. A multi-mode clutch engages and disengages by controlling the clamping or disengagement of friction plates using hydraulic pressure or electromagnetic force, enabling seamless switching and supporting multiple power transmission modes and adapting to complex operating conditions. However, it requires high-precision machining, resulting in high manufacturing costs. A dog clutch (i.e., a claw clutch) engages directly through end-face tooth meshing, can withstand greater torque, and is compact, simple, easy to maintain, and highly reliable. However, it requires synchronized rotational speeds of the motor shafts 11 of the two motors 1 during engagement; otherwise, impact will occur, making it unsuitable for scenarios with frequent switching. In this embodiment, an electromagnetic clutch, a multi-mode clutch, a dog clutch, and a synchronizer can all be selected as the engagement mechanism 4. However, considering factors such as economy, application scenarios, and reliability, an electromagnetic clutch is usually preferred as the engagement mechanism 4 in practical applications.

[0042] Optionally, the dual-motor electric drive device also includes a housing (not shown in the figure), in which the motor 1, planetary gear mechanism 2, half shaft 3 and engagement mechanism 4 are all disposed within the housing, and the first-stage internal gear ring 25 is fixedly connected to the housing, and the planetary carrier 21 is rotatably connected to the housing.

[0043] In this optional embodiment, the housing protects the motor 1, planetary gear set 2, half-shaft 3, and engagement mechanism 4, and allows the electric drive unit to be integrated into a single unit, facilitating overall assembly. The primary internal gear ring 25 can be fixedly connected to the housing using, for example, a key connection, ensuring that the primary internal gear ring 25 does not rotate relative to the housing. The planetary carrier 21 can be rotatably connected to the housing using, for example, a bearing or shaft hole structure. In other words, the primary internal gear ring 25 is fixed within the housing as a fixed component, while the planetary carrier 21 can rotate relative to the housing. Compared to using the planetary carrier 21 as a fixed component, this avoids the need for structural modifications to the relatively complex planetary carrier 21 to fix it, thus simplifying its structure and improving the ease of assembly of the planetary gear set 2.

[0044] Optionally, combined Figure 2As shown, the planetary carrier 21 is connected to the housing and the secondary internal gear ring 26 at both ends along its axial direction via a first bearing 5 and a second bearing 6, respectively. This achieves a rotational connection between the planetary carrier 21 and the housing, and also provides axial support for both ends of the planetary carrier 21 using the first bearing 5 and the second bearing 6, ensuring the planetary carrier 21 is securely installed within the housing. Furthermore, connecting one end of the planetary carrier 21 along its axial direction to the secondary internal gear ring 26 via the second bearing 6 allows that axial end of the planetary carrier 21 to support the secondary internal gear ring 26, thereby ensuring the secure installation of the secondary internal gear ring 26 within the housing and its reliable rotational operation.

[0045] Furthermore, combined Figure 1 As shown, each end of the motor shaft 11 of the motor 1 is rotatably connected to the housing via a third bearing 7. This ensures that the motor shaft 11 can rotate relative to the housing, and also provides support for both ends of the motor shaft 11 using the third bearing 7. The end of the half-shaft 3 near the secondary internal gear ring 26 is rotatably connected to the housing via a fourth bearing 8. This ensures that the half-shaft 3 can rotate relative to the housing, and also provides support for one end of the half-shaft 3 using the fourth bearing 8.

[0046] Optionally, combined Figure 1 As shown, the motor shafts 11 of the two motors 1 are coaxially arranged. In this way, on the one hand, it is convenient for the motor shafts 11 of the two motors 1 to be connected and separated through the coupling mechanism 4, and on the other hand, it can reduce the size of the electric drive device and facilitate the arrangement of the electric drive device on the vehicle.

[0047] Optionally, combined Figure 2 As shown, the first-stage planetary gear 23 includes a first-stage planetary gear body 231 and a first-stage planetary shaft 232. The first-stage planetary gear body 231 is sleeved on the outside of the first-stage planetary shaft 232 and is connected to the first-stage planetary shaft 232 for transmission. The second-stage planetary gear 24 includes a second-stage planetary gear body 241 and a second-stage planetary shaft 242. The second-stage planetary gear body 241 is sleeved on the outside of the second-stage planetary shaft 242 and is connected to the second-stage planetary shaft 242 for transmission. The first-stage planetary gear body 231 and the second-stage planetary gear body 241 are integrally connected, and / or the first-stage planetary shaft 232 and the second-stage planetary shaft 242 are integrally connected.

[0048] In this optional embodiment, the first-stage planetary gear body 231 meshes with the first-stage internal gear ring 25, and the second-stage planetary gear body 241 meshes with the second-stage internal gear ring 26. A spline structure can be used to achieve the transmission connection between the first-stage planetary gear body 231 and the first-stage planetary shaft 232, and between the second-stage planetary gear body 241 and the second-stage planetary shaft 242. The connection between the first-stage planetary gear body 231 and the second-stage planetary gear body 241, and / or between the first-stage planetary shaft 232 and the second-stage planetary shaft 242, can be achieved by methods such as welding or integral molding. This not only improves the robustness of the connection between the first-stage planetary gear body 231 and the second-stage planetary gear body 241, and / or between the first-stage planetary shaft 232 and the second-stage planetary shaft 242, reducing power transmission losses, but also reduces the number of parts and improves assembly convenience and efficiency.

[0049] Optionally, the number of teeth on the first-stage planetary gear body 231 is greater than the number of teeth on the second-stage planetary gear body 241. For gear transmission, the speed ratio refers to the gear ratio of the reducer (i.e., the planetary gear set mechanism 2 in this embodiment), and the gear ratio of the planetary gear set mechanism 2 is: 1 + number of teeth on the first-stage internal gear ring 25 × number of teeth on the first-stage planetary gear 23 / (number of teeth on the sun gear 22 × number of teeth on the second-stage planetary gear 24). If the number of teeth on the first-stage planetary gear body 231 is less than the number of teeth on the second-stage planetary gear body 241, the gear ratio of the planetary gear set mechanism 2 will decrease, thereby reducing the speed ratio of the electric drive device. Therefore, in this embodiment, by setting the number of teeth on the first-stage planetary gear body 231 to be greater than the number of teeth on the second-stage planetary gear body 241, that is, the number of teeth on the first-stage internal gear ring 25 is greater than the number of teeth on the second-stage planetary gear 24, the transmission ratio of the planetary gear set mechanism 2 is increased, thereby improving the speed ratio of the electric drive device.

[0050] Optionally, combined Figure 2 As shown, the outer diameter of the first-stage planetary gear body 231 is larger than the outer diameter of the second-stage planetary gear body 241. This allows for a reduction in the diameter of the second-stage internal gear ring 26, which meshes with the second-stage planetary gear body 241, thereby reducing the weight and material usage of the second-stage internal gear ring 26 and lowering production costs.

[0051] Optionally, combined Figure 2 As shown, the motor shaft 11 of motor 1 is integrally connected to the sun gear 22 of the corresponding planetary gear mechanism 2. The integral connection between the motor shaft 11 of motor 1 and the corresponding sun gear 22 can be achieved through methods such as welding or integral molding. This not only improves the robustness of the connection between the motor shaft 11 of motor 1 and the corresponding sun gear 22, reducing power transmission losses, but also reduces the number of parts, improving assembly convenience and efficiency.

[0052] Optionally, combined Figure 2As shown, the half-shaft 3 and the corresponding secondary internal gear ring 26 are connected by a spline structure. This ensures that the half-shaft 3 and the secondary internal gear ring 26 can maintain a certain degree of coaxiality while also withstanding a large torque load, thus better transmitting large torque.

[0053] This utility model provides a vehicle including a dual-motor electric drive device as described above.

[0054] The beneficial effects of the vehicle in this embodiment are the same as those of the dual-motor electric drive device described above, and will not be repeated here.

[0055] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A dual-motor electric drive device, characterized in that, It includes two motors (1), two planetary gear sets (2), and two half shafts (3); The planetary gear mechanism (2) includes a planet carrier (21), a sun gear (22), multiple first-stage planetary gears (23), multiple second-stage planetary gears (24), a first-stage internal gear ring (25), and a second-stage internal gear ring (26). One of the planet carrier (21) and the first-stage internal gear ring (25) is configured as a fixed member. The multiple first-stage planetary gears (23) and the multiple second-stage planetary gears (24) are arranged on the planet carrier (21) and are arranged in a corresponding manner. The corresponding first-stage planetary gears (23) and second-stage planetary gears (24) are coaxially connected. Each first-stage planetary gear (23) meshes with the sun gear (22) and the first-stage internal gear ring (25), and each second-stage planetary gear (24) meshes with the second-stage internal gear ring (26). The sun gears (22) of the two planetary gear mechanisms (2) are respectively connected to the motor shafts (11) of the two motors (1), and the secondary internal gear rings (26) of the two planetary gear mechanisms (2) are respectively connected to the two half shafts (3).

2. The dual-motor electric drive device according to claim 1, characterized in that, It also includes a coupling mechanism (4), which is disposed between the two motors (1) for connecting or separating the motor shafts (11) of the two motors (1).

3. The dual-motor electric drive device according to claim 2, characterized in that, It also includes a housing, in which the motor (1), the planetary gear mechanism (2), the half shaft (3) and the engagement mechanism (4) are all disposed, and the first-stage internal gear ring (25) is fixedly connected to the housing, and the planetary carrier (21) is rotatably connected to the housing.

4. The dual-motor electric drive device according to claim 1, characterized in that, The first-stage planetary gear (23) includes a first-stage planetary gear body (231) and a first-stage planetary shaft (232). The first-stage planetary gear body (231) is sleeved on the first-stage planetary shaft (232) and is connected to the first-stage planetary shaft (232) for transmission. The second-stage planetary gear (24) includes a second-stage planetary gear body (241) and a second-stage planetary shaft (242). The second-stage planetary gear body (241) is sleeved on the second-stage planetary shaft (242) and is connected to the second-stage planetary shaft (242) for transmission. The first-stage planetary gear body (231) and the second-stage planetary gear body (241) are integrally connected, and / or the first-stage planetary shaft (232) and the second-stage planetary shaft (242) are integrally connected.

5. The dual-motor electric drive device according to claim 4, characterized in that, The number of teeth on the first-stage planetary gear body (231) is greater than the number of teeth on the second-stage planetary gear body (241).

6. The dual-motor electric drive device according to claim 4, characterized in that, The outer diameter of the first-stage planetary gear body (231) is larger than the outer diameter of the second-stage planetary gear body (241).

7. The dual-motor electric drive device according to claim 3, characterized in that, The planetary carrier (21) is connected to the housing and the secondary internal gear ring (26) at both ends along its axial direction via a first bearing (5) and a second bearing (6), respectively.

8. The dual-motor electric drive device according to claim 1, characterized in that, The motor shaft (11) of the motor (1) is integrally connected to the sun gear (22) of the corresponding planetary gear mechanism (2), and / or, the half shaft (3) and the corresponding secondary internal gear ring (26) are connected by a spline structure.

9. The dual-motor electric drive device according to claim 2, characterized in that, The engagement mechanism (4) is one of an electromagnetic clutch, a multi-mode clutch, a dog clutch, and a synchronizer.

10. A vehicle, characterized in that, Includes the dual-motor electric drive device as described in any one of claims 1-9.

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