Dual-motor driving system for vehicle and vehicle

Abstract

The invention discloses a dual-motor driving system for a vehicle and the vehicle, and relates to the technical field of driving systems.The dual-motor driving system for the vehicle comprises a first motor, a second motor and a differential lock, and the first motor and the second motor are arranged in the first direction; the first motor output shaft and the second motor output shaft are used for being in transmission connection with a first wheel assembly and a second wheel assembly of a vehicle respectively, the differential lock comprises a first gear, a second gear and a joint part, the first gear is in transmission connection with the first motor output shaft, and the second gear is used for being in transmission connection with the second wheel assembly. The engagement portion is configured to engage or disengage the first gear and the second gear. According to the dual-motor driving system, the power distribution adjusting function and the differential speed adjusting function of the dual-motor driving system can be achieved easily, the efficient working interval of the first motor and the second motor can be increased, the escape capacity of the vehicle can be improved easily, and the space occupation of the dual-motor driving system can be reduced easily.

Description

Technical Field

[0001] This invention relates to the field of drive system technology, and in particular to a dual-motor drive system for a vehicle and a vehicle having the dual-motor drive system. Background Technology

[0002] In related technologies, existing dual-motor drive systems generally do not have differential locks, making it difficult for vehicles to get out of trouble when stuck. In addition, existing dual-motor drive systems have complex structures and large volumes, which affect the space utilization of vehicles. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a dual-motor drive system for vehicles, which facilitates the adjustment of power distribution and differential functions of the dual-motor drive system, improves the efficient operating range of the first and second motors, enhances the vehicle's ability to overcome obstacles, and reduces the space occupied by the dual-motor drive system.

[0004] The present invention also proposes a vehicle using the above-described dual-motor drive system for vehicles.

[0005] A dual-motor drive system for a vehicle according to a first aspect of the present invention includes: a first motor, a second motor, and a differential lock. The first motor and the second motor are arranged along a first direction. The first motor has a first motor output shaft, and the second motor has a second motor output shaft. Both the first motor output shaft and the second motor output shaft extend along a second direction. The first motor output shaft and the second motor output shaft are respectively used for drive connection to a first wheel assembly and a second wheel assembly of the vehicle. The first direction, the second direction, and the vertical direction are perpendicular to each other. The differential lock includes a first gear, a second gear, and an engagement portion. The first gear is drive-connected to the first motor output shaft, and the second gear is drive-connected to the second wheel assembly. The first gear and the second gear are opposite each other along the second direction. At least a portion of the engagement portion is located between the first gear and the second gear, and the engagement portion is configured to engage or disengage the first gear and the second gear.

[0006] According to the embodiments of this application, a dual-motor drive system for vehicles is provided, in which a joint selectively engages or disengages a first gear and a second gear. When the joint disengages the first and second gears, it facilitates the independent driving of the wheels of the first and second wheel assemblies by the first and second motors, thereby enabling the dual-motor drive system to adjust power distribution and perform differential functions. It also improves the high-efficiency operating range of the first and second motors, enhancing their driving and energy recovery efficiency, and ultimately improving the vehicle's economic efficiency. When the joint engages the first and second gears, it enhances the vehicle's ability to overcome obstacles, and the compact structure of the dual-motor drive system reduces its space requirements.

[0007] According to some embodiments of the present invention, along the second direction, the differential lock is located on one side of the first motor, and the differential lock further includes: a first rotating shaft, the first rotating shaft extending along the second direction, the first rotating shaft passing through the first gear and the second gear, one of the first gear and the second gear being fixed to the first rotating shaft, and the other being rotatable relative to the first rotating shaft.

[0008] According to some embodiments of the present invention, the engagement portion is annular and sleeved on the first rotating shaft, and the engagement portion is movably disposed on one of the first gear and the second gear along the second direction, so as to engage or disengage the first gear and the second gear by moving the engagement portion along the second direction.

[0009] According to some embodiments of the present invention, the dual-motor drive system further includes: a first reduction mechanism along the second direction, the first reduction mechanism being located on the other side of the first motor, the output shaft of the first motor being drive-connected to the first reduction mechanism, and the first reduction mechanism being used for drive-connection with the first wheel assembly.

[0010] According to some embodiments of the present invention, the first reduction mechanism includes: a first transmission part and a second transmission part, wherein the first transmission part is tractively connected between the first motor output shaft and the second transmission part, and the second transmission part is tractively connected to the first wheel assembly.

[0011] According to some embodiments of the present invention, the first transmission part includes: a plurality of first transmission gears, the plurality of first transmission gears being arranged sequentially along the first direction and any two adjacent first transmission gears meshing, one of the plurality of first transmission gears being drivenly connected to the output shaft of the first motor, and the other of the plurality of first transmission gears being drivenly connected to the second transmission part; and / or the second transmission part is a first planetary gear structure, the first sun gear of the first planetary gear structure being drivenly connected to the first transmission part, and the first planet carrier of the first planetary gear structure being drivenly connected to the first wheel assembly.

[0012] According to some embodiments of the present invention, the dual-motor drive system further includes: a second reduction mechanism, which is located on one side of the second motor along the second direction, and the output shaft of the second motor is connected to the second reduction mechanism for transmission, and the second reduction mechanism is used for transmission connection with the second wheel assembly.

[0013] According to some embodiments of the present invention, the second reduction mechanism includes a third transmission part and a fourth transmission part, the third transmission part being driveably connected between the output shaft of the second motor and the fourth transmission part, the fourth transmission part being driveably connected to the second wheel assembly, and the second gear being driveably connected to the third transmission part.

[0014] According to some embodiments of the present invention, the third transmission unit includes: a plurality of second transmission gears, the plurality of second transmission gears being arranged sequentially along the first direction and any two adjacent second transmission gears meshing, one of the plurality of second transmission gears being drive-connected to the output shaft of the second motor, and the other of the plurality of second transmission gears being drive-connected to both the fourth transmission unit and the second gear; and / or the fourth transmission unit is a second planetary gear structure, the second sun gear of the second planetary gear structure being drive-connected to the third transmission unit, and the second planet carrier of the second planetary gear structure being drive-connected to the second wheel assembly.

[0015] A vehicle according to a second aspect of the present invention includes the dual-motor drive system for a vehicle described in the above embodiments.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a dual-motor drive system according to an embodiment of this application.

[0018] Figure label: Dual-motor drive system 1, First motor 10, first motor output shaft 11 Second motor 20, second motor output shaft 21 Differential lock 30, first gear 31, second gear 32, engagement part 33, first rotating shaft 34. The system comprises a first reduction gear 40, a first transmission unit 41, a first transmission gear 411, a second transmission unit 42, a first sun gear 421, a first planet carrier 422, a first planet gear 423, and a first internal gear ring 424. The system comprises a second reduction gear 50, a third transmission unit 51, a second transmission gear 511, a fourth transmission unit 52, a second sun gear 521, a second planet carrier 522, a second planet gear 523, and a second internal gear ring 524. First connecting gear 60, First wheel assembly 2, second wheel assembly 3. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The following is for reference. Figure 1 A dual-motor drive system 1 for a vehicle according to an embodiment of the present invention is described. The dual-motor drive system 1 can be installed in a vehicle.

[0021] A dual-motor drive system 1 for a vehicle according to a first aspect embodiment of the present invention, such as Figure 1As shown, a dual-motor drive system 1 for a vehicle may include: a first motor 10, a second motor 20, and a differential lock 30. The first motor 10 and the second motor 20 are arranged along a first direction. The first motor 10 has a first motor output shaft 11, and the second motor 20 has a second motor output shaft 21. Both the first motor output shaft 11 and the second motor output shaft 21 extend along a second direction. The first motor output shaft 11 and the second motor output shaft 21 are respectively used for drive connection with a first wheel assembly 2 and a second wheel assembly 3 of the vehicle. The first direction, the second direction, and the vertical direction are perpendicular to each other. The differential lock 30 includes a first gear 31, a second gear 32, and an engagement portion 33. The first gear 31 is drive-connected to the first motor output shaft 11, and the second gear 32 is drive-connected to the second wheel assembly 3. The first gear 31 and the second gear 32 are opposite each other along the second direction. At least a portion of the engagement portion 33 is located between the first gear 31 and the second gear 32. The engagement portion 33 is configured to engage or disengage the first gear 31 and the second gear 32.

[0022] It should be noted that existing dual-motor drive systems generally do not have differential locks, making it difficult for vehicles to get out of trouble when stuck. In addition, existing dual-motor drive systems have complex structures and large volumes, which affect the space utilization of vehicles.

[0023] Based on this, this application proposes a dual-motor drive system 1 for a vehicle, wherein the first motor 10 and the second motor 20 can be arranged along a first direction, and when the dual-motor drive system 1 is as follows... Figure 1 When setting the direction, the first direction is Figure 1 In the X-direction, the first direction can be parallel to the length direction of the vehicle. The first motor 10 can have a first motor output shaft 11, and the second motor 20 can have a second motor output shaft 21. Both the first motor output shaft 11 and the second motor output shaft 21 can extend along the second direction. The first motor output shaft 11 and the second motor output shaft 21 can be arranged along the first direction, and the first motor output shaft 11 and the second motor output shaft 21 can be arranged in parallel. This is beneficial for shortening the distance between the first motor output shaft 11 and the second motor output shaft 21 along the first direction, which is beneficial for shortening the size of the dual-motor drive system 1 along the first direction, which is beneficial for reducing the space occupied by the dual-motor drive system 1 along the first direction, which is beneficial for improving the integration of the dual-motor drive system 1, and which is beneficial for providing space for the installation of other vehicle components. When the dual-motor drive system 1 is as follows... Figure 1 When setting the direction, the second direction is Figure 1In the vehicle's Y-direction, the second direction can be parallel to the vehicle's width direction. The first direction, the second direction, and the vertical direction are perpendicular to each other, and the vertical direction can be parallel to the vehicle's height direction. The first motor output shaft 11 can be used to drive the first wheel assembly 2 of the vehicle. The first motor output shaft 11 can be used to drive the wheels of the first wheel assembly 2 to rotate. The second motor output shaft 21 can be used to drive the second wheel assembly 3 of the vehicle. The second motor output shaft 21 can be used to drive the wheels of the second wheel assembly 3 to rotate.

[0024] The differential lock 30 may include a first gear 31, a second gear 32, and a coupling portion 33. The first gear 31 may be driven to rotate by the first motor output shaft 11, and the first motor output shaft 11 may drive the first gear 31 to rotate. The first gear 31 may be located on the side of the first motor output shaft 11 opposite to the first wheel assembly 2. As an example, the dual-motor drive system 1 may also include a first connecting gear 60, which may be fixed to the first motor output shaft 11 and may mesh with the first gear 31, thereby achieving the effect of driving connection between the first motor output shaft 11 and the first gear 31. The second gear 32 may be driven to rotate by the second wheel assembly 3. The first gear 31 and the second gear 32 may be opposite each other in a second direction. At least a portion of the coupling portion 33 may be located between the first gear 31 and the second gear 32, and at least a portion of the coupling portion 33 may be connected to the first gear 31 and the second gear 32 respectively. The engagement portion 33 can be configured to engage or disengage the first gear 31 and the second gear 32. When at least a portion of the engagement portion 33 is connected to the first gear 31 and the second gear 32 respectively, the engagement portion 33 engages the first gear 31 and the second gear 32. When at least a portion of the engagement portion 33 is separated from at least one of the first gear 31 and the second gear 32, the engagement portion 33 disengages the first gear 31 and the second gear 32.

[0025] When the engagement 33 disengages from the first gear 31 and the second gear 32, the first motor 10 and the second motor 20 are connected in parallel. The first motor 10 and the second motor 20 can independently drive the wheels of the first wheel assembly 2 and the second wheel assembly 3 to rotate. The motor controller can monitor the rotational speeds of the wheels of the first wheel assembly 2 and the second wheel assembly 3 in real time through wheel speed sensors. This facilitates the automatic adjustment of the output speed and torque of the first motor 10 and the second motor 20, enabling the dual-motor drive system 1 to perform power distribution and differential functions. It also improves the high-efficiency operating range of the first motor 10 and the second motor 20, enhancing their driving and energy recovery efficiency, and ultimately improving the vehicle's economic efficiency.

[0026] When the engagement part 33 engages the first gear 31 and the second gear 32, the first motor 10 and the second motor 20 are connected in series. When the vehicle is stationary or at a low speed, the engagement part 33 can engage the first gear 31 and the second gear 32, making the rotational speeds of the first motor output shaft 11 and the second motor output shaft 21 the same. The first motor 10 and the second motor 20 can provide power simultaneously, which is beneficial for achieving the effect of optimizing the torque distribution of the two motors through the differential lock 30 in the dual-motor drive system 1. When one wheel of the vehicle has high traction and the other wheel has low traction, i.e., when the vehicle is stuck, the torque cannot be transmitted to the wheel with low traction. The total torque of the first motor 10 and the second motor 20 can be directed to the wheel with high traction through the differential lock 30, which is beneficial for improving the vehicle's ability to get out of trouble.

[0027] As an example, when one wheel of a vehicle is stuck in mud, sand, or ice, meaning that one wheel has low traction and may be slightly spinning, the ground cannot provide sufficient reaction force to that wheel, and torque cannot be transferred to the wheel with low traction. Conversely, when the other wheel is on a solid surface, meaning that the other wheel has high traction, the ground can provide sufficient reaction force to that wheel, and the wheel with high traction can bear the full torque, thus enabling the vehicle to get out of trouble.

[0028] In this embodiment, the engagement portion 33 selectively engages or disengages the first gear 31 and the second gear 32. When the engagement portion 33 disengages the first gear 31 and the second gear 32, it facilitates the independent driving of the wheels of the first wheel assembly 2 and the second wheel assembly 3 by the first motor 10 and the second motor 20. This facilitates the adjustment of power distribution and differential function of the dual-motor drive system 1, and also improves the high-efficiency operating range of the first motor 10 and the second motor 20, thereby improving the driving and energy recovery efficiency of the first motor 10 and the second motor 20 and enhancing the vehicle's economic efficiency. When the engagement portion 33 engages the first gear 31 and the second gear 32, it improves the vehicle's ability to get out of trouble, and the compact structure of the dual-motor drive system 1 helps reduce its space occupation.

[0029] In some embodiments of the present invention, such as Figure 1 As shown, along the second direction, the differential lock 30 is located on one side of the first motor 10. The differential lock 30 may also include: a first rotating shaft 34, which extends along the second direction and passes through a first gear 31 and a second gear 32. One of the first gear 31 and the second gear 32 is fixed to the first rotating shaft 34, and the other is rotatable relative to the first rotating shaft 34.

[0030] The differential lock 30 is located on one side of the first motor 10 along the second direction, which helps to further shorten the size of the dual-motor drive system 1 along the first direction, further reduce the space occupied by the dual-motor drive system 1 along the first direction, further improve the integration of the dual-motor drive system 1, and further provide space for the installation of other vehicle components. The differential lock 30 may also include a first rotating shaft 34, which can extend along the second direction and can pass through the first gear 31 and the second gear 32. The rotation axes of the first rotating shaft 34, the first gear 31, and the second gear 32 are collinear. One of the first gear 31 and the second gear 32 can be fixed to the first rotating shaft 34, and the other of the first gear 31 and the second gear 32 can rotate relative to the first rotating shaft 34. When one of the first gear 31 and the second gear 32 rotates, the first gear 31 and the second gear 32 rotate synchronously with the first rotating shaft 34. When the other of the first gear 31 and the second gear 32 rotates, the other of the first gear 31 and the second gear 32 rotates relative to the first rotating shaft 34. This is beneficial to further realize the effect of disconnecting the first gear 31 and the second gear 32, and to further realize the effect of the first motor 10 and the second motor 20 independently driving the wheels of the first wheel assembly 2 and the wheels of the second wheel assembly 3 to rotate.

[0031] In some embodiments of the present invention, such as Figure 1 As shown, the joint 33 is annular and sleeved on the first rotating shaft 34. The joint 33 is movably disposed in one of the first gear 31 and the second gear 32 along the second direction. The first gear 31 and the second gear 32 are engaged or disengaged by the movement of the joint 33 along the second direction.

[0032] The engagement portion 33 can be constructed as a ring and can be sleeved on the first rotating shaft 34. The engagement portion 33 is movably disposed in one of the first gear 31 and the second gear 32 along a second direction, and can move relative to the first gear 31 and the second gear 32 in the second direction. When the engagement portion 33 moves along the second direction so that it is sleeved on the first rotating shaft 34 and connected to the other of the first gear 31 and the second gear 32, the engagement portion 33 engages the first gear 31 and the second gear 32. When the engagement portion 33 moves along the second direction so that it is sleeved on the first rotating shaft 34 and not connected to the other of the first gear 31 and the second gear 32, the engagement portion 33 disengages from the first gear 31 and the second gear 32. By setting the engagement portion 33 to move relative to the first rotating shaft 34 in the second direction, the effect of engaging or disengaging the first gear 31 and the second gear 32 can be achieved, which helps to simplify the structure of the differential lock 30 and reduce the cost of the dual-motor drive system 1.

[0033] In one embodiment, the second gear 32 is fixed to the first rotating shaft 34, and the first gear 31 is rotatable relative to the first rotating shaft 34. The second gear 32 can be fixedly connected to the first rotating shaft 34 via spline connection, welding, or other methods. The first rotating shaft 34 can pass through the first gear 31, allowing the first gear 31 to rotate relative to the first rotating shaft 34 when it rotates. When the second gear 32 rotates, it can drive the first rotating shaft 34 to rotate synchronously. A connecting portion 33 is sleeved on the first rotating shaft 34 and movably disposed on the second gear 32 along a second direction. The connecting portion 33 can move along the second direction toward the first gear 31 and connect with it, thereby achieving the effect of engaging the first gear 31 and the second gear 32. The connecting portion 33 can also move along the second direction away from the first gear 31 and separate from it, thereby achieving the effect of disconnecting the first gear 31 and the second gear 32.

[0034] As an example, the joint 33 can be constructed as an annular shape, or as a gear sleeve. The inner peripheral wall of the joint 33 can be formed with internal gear teeth, and the outer peripheral wall of the first rotating shaft 34 can be formed with a spline structure extending axially along the first rotating shaft 34. The internal gear teeth can mesh with the spline structure. The joint 33 can be fixedly connected to the first rotating shaft 34 via the spline structure, and the joint 33 can rotate synchronously with the first rotating shaft 34, and can move axially along the first rotating shaft 34.

[0035] As an example, the dual-motor drive system 1 may further include: a drive motor, a ball screw, and a shift fork. The drive motor may have a drive motor output shaft, which may be connected to one end of the ball screw via a sleeve, coupling, or the like. The nut of the ball screw may be fixedly connected to the shift fork, and the shift fork may be fixedly connected to the engagement portion 33. The drive motor can drive the drive motor output shaft to rotate the screw synchronously. The screw can drive the nut of the ball screw to move along the axial direction of the screw via the balls. The axial direction of the screw may be parallel to a second direction, thereby achieving the effect of the ball screw driving the shift fork to move along the second direction. The shift fork can drive the engagement portion 33 to move along the second direction, thereby achieving the effect of the engagement portion 33 engaging or disengaging the first gear 31 and the second gear 32.

[0036] In some embodiments of the present invention, such as Figure 1 As shown, the dual-motor drive system 1 may further include: a first reduction mechanism 40, which is located on the other side of the first motor 10 along the second direction, and the output shaft 11 of the first motor is connected to the first reduction mechanism 40 in a transmission connection. The first reduction mechanism 40 is used to be connected to the first wheel assembly 2 in a transmission connection.

[0037] The first reduction mechanism 40 can be located on the other side of the first motor 10 along the second direction. The output shaft 11 of the first motor can be connected to the first reduction mechanism 40 for transmission. The first reduction mechanism 40 can be used to be connected to the first wheel assembly 2 for transmission. The output torque of the first motor 10 can be transmitted to the first wheel assembly 2 through the first motor output shaft 11 and the first reduction mechanism 40. This is beneficial to shortening the transmission link between the first motor 10 and the first wheel assembly 2, improving transmission efficiency, reducing energy loss, and improving the reliability of the dual-motor drive system 1.

[0038] In some embodiments of the present invention, such as Figure 1 As shown, the first reduction mechanism 40 may include: a first transmission part 41 and a second transmission part 42. The first transmission part 41 is connected between the first motor output shaft 11 and the second transmission part 42, and the second transmission part 42 is used to be connected to the first wheel assembly 2.

[0039] The first transmission unit 41 and the second transmission unit 42 can be arranged along the first direction, which helps to reduce the size of the dual-motor drive system 1 along the second direction, reduces the space occupied by the dual-motor drive system 1 along the second direction, and further improves the integration of the dual-motor drive system 1. The first transmission unit 41 can be driven between the first motor output shaft 11 and the second transmission unit 42, and the second transmission unit 42 can be driven to the first wheel assembly 2. The output torque of the first motor 10 can be transmitted to the first wheel assembly 2 through the first motor output shaft 11, the first transmission unit 41 and the second transmission unit 42, which helps to further improve transmission efficiency, further reduce energy loss, and further improve the reliability of the dual-motor drive system 1.

[0040] As an example, when the first motor 10 starts, the power output by the first motor 10 can be transmitted to the first transmission unit 41 through the first motor output shaft 11. Then the power can be transmitted to the second transmission unit 42. After the second transmission ratio optimization, the power can be accurately transmitted to the first wheel assembly 2, thereby driving the wheels of the first wheel assembly 2 to rotate.

[0041] In some embodiments of the present invention, such as Figure 1 As shown, the first transmission unit 41 includes: a plurality of first transmission gears 411, the plurality of first transmission gears 411 being arranged sequentially along a first direction and any two adjacent first transmission gears 411 meshing, one of the plurality of first transmission gears 411 being connected to the output shaft 11 of the first motor, and another of the plurality of first transmission gears 411 being connected to the second transmission unit 42; and / or the second transmission unit 42 is a first planetary gear structure, the first sun gear 421 of the first planetary gear structure being connected to the first transmission unit 41, and the first planet carrier 422 of the first planetary gear structure being connected to the first wheel assembly 2.

[0042] The first transmission part 41 may include a plurality of first transmission gears 411, or the second transmission part 42 may be a first planetary gear structure, or the first transmission part 41 may include a plurality of first transmission gears 411 and the second transmission part 42 may be a first planetary gear structure. In this embodiment, the first transmission part 41 includes a plurality of first transmission gears 411 and the second transmission part 42 is a first planetary gear structure as an example for illustration.

[0043] The first transmission unit 41 may include a plurality of first transmission gears 411, which may be arranged sequentially along a first direction or in a linear series arrangement along the first direction. This arrangement is beneficial for further reducing the size of the dual-motor drive system 1 along the second direction, further reducing the space occupied by the dual-motor drive system 1 along the second direction, and further improving the integration of the dual-motor drive system 1. Any two adjacent first transmission gears 411 may mesh. One of the plurality of first transmission gears 411 may be connected to the output shaft 11 of the first motor via a spline or coupling, etc., and the corresponding first transmission gear 411 may be used to receive high-speed, low-torque power output from the first motor 10. Another of the plurality of first transmission gears 411 may be connected to the second transmission unit 42, thereby transmitting the adjusted power to the second transmission unit 42. Multiple first transmission gears 411 located between the first transmission gear 411 that is connected to the output shaft 11 of the first motor and the first transmission gear 411 that is connected to the second transmission unit 42 can achieve step-by-step power transmission through meshing.

[0044] The second transmission unit 42 can be a first planetary gear structure, which may include a first sun gear 421, a first planet gear 423, a first internal gear ring 424, and a first planet carrier 422. The first sun gear 421 of the first planetary gear structure is connected to the first transmission unit 41, that is, the first sun gear 421 can be connected to the first transmission gear 411 of the first transmission unit 41. The power transmitted from the first transmission unit 41 to the second transmission unit 42 can drive the first sun gear 421 to rotate. The first internal gear ring 424 is fixed, and the first planet carrier 422 and the first planet gear 423 are fixedly connected. The first sun gear 421 and the first planet gear 423 mesh, and the first sun gear 421 can drive the first planet gear 423 to rotate. The rotating first planet gear 423 can drive the first planet carrier 422 to move circumferentially along the first internal gear ring 424, that is, the rotating first planet gear 423 can drive the first planet carrier 422 to revolve around the central axis of the first sun gear 421. The first planetary carrier 422 can be used for transmission connection with the first wheel assembly 2. The first planetary carrier 422 can transmit the power after significant reduction and torque increase to the first wheel assembly 2, thereby driving the wheels of the first wheel assembly 2 to rotate. The first planetary gear structure is compact, which is conducive to further reducing the size of the dual-motor drive system 1 along the first direction and further reducing the space occupied by the dual-motor drive system 1 along the first direction.

[0045] As an example, the output shaft in the second transmission unit 42 for transmitting power to the first wheel assembly 2 can extend along the second direction, and the corresponding output shaft can be coaxially arranged with the second motor output shaft 21, which is beneficial to further improve the integration of the dual motor drive system 1 and further reduce the space occupation of the dual motor drive system 1.

[0046] In some embodiments of the present invention, such as Figure 1 As shown, the dual-motor drive system 1 may further include: a second reduction mechanism 50, which is located on one side of the second motor 20 along the second direction. The output shaft 21 of the second motor is connected to the second reduction mechanism 50 in a transmission connection. The second reduction mechanism 50 is used to be connected to the second wheel assembly 3 in a transmission connection.

[0047] The second reduction mechanism 50 can be located on one side of the second motor 20 along the second direction, and the second reduction mechanism 50 and the differential lock 30 can be located on the same side of the dual-motor drive system 1. The output shaft 21 of the second motor can be drivenly connected to the second reduction mechanism 50, and the second reduction mechanism 50 can be drivenly connected to the second wheel assembly 3. The output torque of the second motor 20 can be transmitted to the second wheel assembly 3 through the second motor output shaft 21 and the second reduction mechanism 50, which helps to shorten the transmission link between the second motor 20 and the second wheel assembly 3, further improves transmission efficiency, further reduces energy loss, and further improves the reliability of the dual-motor drive system 1.

[0048] In some embodiments of the present invention, such as Figure 1 As shown, the second reduction mechanism 50 may include a third transmission part 51 and a fourth transmission part 52. The third transmission part 51 is driven between the second motor output shaft 21 and the fourth transmission part 52. The fourth transmission part 52 is driven to be driven to the second wheel assembly 3, and the second gear 32 is driven to be driven to the third transmission part 51.

[0049] The third transmission unit 51 and the fourth transmission unit 52 can be arranged along the second direction, which helps to reduce the size of the second reduction mechanism 50 along the first direction, reduces the space occupied by the second reduction mechanism 50 along the first direction, provides installation space for the differential lock 30, allows the second reduction mechanism 50 to avoid the differential lock 30, and further reduces the size of the dual-motor drive system 1 along the first direction. The third transmission unit 51 can be driven between the second motor output shaft 21 and the fourth transmission unit 52, and the fourth transmission unit 52 can be driven to the second wheel assembly 3. The output torque of the second motor 20 can be transmitted to the second wheel assembly 3 through the second motor output shaft 21, the third transmission unit 51 and the fourth transmission unit 52, which helps to further improve transmission efficiency, further reduce energy loss, and further improve the reliability of the dual-motor drive system 1.

[0050] The second gear 32 can be connected to the third transmission unit 51. The output torque of the second motor 20 can be transmitted to the second gear 32 through the second motor output shaft 21 and the third transmission unit 51, thereby achieving the effect of the second motor 20 driving the second gear 32 to rotate.

[0051] In some embodiments of the present invention, such as Figure 1 As shown, the third transmission unit 51 may include: a plurality of second transmission gears 511, the plurality of second transmission gears 511 being arranged sequentially along a first direction and any two adjacent second transmission gears 511 meshing, one of the plurality of second transmission gears 511 being connected to the output shaft 21 of the second motor, and the other of the plurality of second transmission gears 511 being connected to both the fourth transmission unit 52 and the second gear 32; and / or the fourth transmission unit 52 is a second planetary gear structure, the second sun gear 521 of the second planetary gear structure is connected to the third transmission unit 51, and the second planet carrier 522 of the second planetary gear structure is used to be connected to the second wheel assembly 3.

[0052] The third transmission part 51 may include a plurality of second transmission gears 511, or the fourth transmission part 52 may be a second planetary gear structure. Alternatively, the third transmission part 51 may include a plurality of second transmission gears 511, and the fourth transmission part 52 may be a second planetary gear structure. In this embodiment, the example of the third transmission part 51 including a plurality of second transmission gears 511 and the fourth transmission part 52 being a second planetary gear structure is used for illustration.

[0053] The third transmission unit 51 may include multiple second transmission gears 511, which can be arranged sequentially along the first direction or linearly connected in series along the first direction. This arrangement helps to further reduce the size of the dual-motor drive system 1 along the second direction, further reduce the space occupied by the dual-motor drive system 1 along the second direction, and further improve the integration of the dual-motor drive system 1. Any two adjacent second transmission gears 511 can mesh. One of the multiple second transmission gears 511 can be connected to the output shaft 21 of the second motor via a spline or coupling, etc., and can be used to receive the torque power output by the second motor 20. Another of the multiple second transmission gears 511 can be connected to the fourth transmission unit 52, thereby transmitting the adjusted power to the fourth transmission unit 52. The other of the multiple second transmission gears 511 can also be connected to the second gear 32, thereby driving the second gear 32 to rotate. Multiple second transmission gears 511 located between the second transmission gear 511 that is connected to the output shaft 21 of the second motor and the second transmission gear 511 that is connected to the fourth transmission unit 52 can achieve step-by-step power transmission through meshing.

[0054] The fourth transmission unit 52 can be a second planetary gear structure, which includes a second sun gear 521, a second planetary gear 523, a second internal gear ring 524, and a second planetary carrier 522. The second sun gear 521 of the second planetary gear structure is connected to the third transmission unit 51, that is, the second sun gear 521 can be connected to the second transmission gear 511 of the third transmission unit 51. The power transmitted from the third transmission unit 51 to the fourth transmission unit 52 can drive the second sun gear 521 to rotate. The second internal gear ring 524 is fixed, and the second planetary carrier 522 and the second planetary gear 523 are fixedly connected. The second sun gear 521 and the second planetary gear 523 mesh, and the second sun gear 521 can drive the second planetary gear 523 to rotate. The rotating second planetary gear 523 can drive the second planetary carrier 522 to move circumferentially along the second internal gear ring 524, that is, the rotating second planetary gear 523 can drive the second planetary carrier 522 to revolve around the central axis of the second sun gear 521. The second planetary carrier 522 can be used for transmission connection with the second wheel assembly 3. The second planetary carrier 522 can transmit the power after significant reduction and torque increase to the second wheel assembly 3, thereby driving the wheels of the second wheel assembly 3 to rotate. The second planetary gear structure is compact, which is conducive to further reducing the size of the dual-motor drive system 1 along the second direction and further reducing the space occupied by the dual-motor drive system 1 along the second direction.

[0055] As an example, the output shaft in the fourth transmission unit 52 for transmitting power to the second wheel assembly 3 can extend in the second direction, and the corresponding output shaft can be coaxially arranged with the second motor output shaft 21, which is beneficial to further improve the integration of the dual motor drive system 1 and further reduce the space occupation of the dual motor drive system 1.

[0056] A vehicle according to a second aspect of the present invention includes the dual-motor drive system 1 for a vehicle described in the above embodiments.

[0057] According to the embodiments of this application, the use of the dual-motor drive system 1 for vehicles in the above embodiments is beneficial to improving the vehicle's ability to get out of trouble and to improving the vehicle's space utilization.

[0058] As an example, when the dual-motor drive system 1 is positioned at the front of the vehicle and connected to the left and right wheels located at the front of the vehicle, a dual-motor front-wheel drive mode can be achieved. When the dual-motor drive system 1 is positioned at the rear of the vehicle and connected to the left and right wheels located at the rear of the vehicle, a dual-motor rear-wheel drive mode can be achieved. When the vehicle has two sets of dual-motor drive systems 1, one of which is positioned at the front of the vehicle and connected to the left and right wheels located at the front of the vehicle, and the other of which is positioned at the rear of the vehicle and connected to the left and right wheels located at the rear of the vehicle, a dual-motor four-wheel drive mode can be achieved.

[0059] The dual-motor drive system 1 and other components and operations of the vehicle according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-motor drive system for a vehicle, characterized in that, include: A first motor (10) and a second motor (20) are arranged along a first direction. The first motor (10) has a first motor output shaft (11), and the second motor (20) has a second motor output shaft (21). Both the first motor output shaft (11) and the second motor output shaft (21) extend along a second direction. The first motor output shaft (11) and the second motor output shaft (21) are respectively used for transmission connection with the first wheel assembly (2) and the second wheel assembly (3) of the vehicle. The first direction, the second direction and the vertical direction are perpendicular to each other. A differential lock (30) includes a first gear (31), a second gear (32), and an engagement portion (33). The first gear (31) is driven to the first motor output shaft (11), and the second gear (32) is driven to the second wheel assembly (3). The first gear (31) and the second gear (32) are opposite each other in the second direction. At least a portion of the engagement portion (33) is located between the first gear (31) and the second gear (32). The engagement portion (33) is configured to engage or disengage the first gear (31) and the second gear (32).

2. The dual-motor drive system for vehicles according to claim 1, characterized in that, Along the second direction, the differential lock (30) is located on one side of the first motor (10). The differential lock (30) further includes: a first rotating shaft (34), which extends along the second direction and passes through the first gear (31) and the second gear (32). One of the first gear (31) and the second gear (32) is fixed to the first rotating shaft (34), and the other is rotatable relative to the first rotating shaft (34).

3. The dual-motor drive system for vehicles according to claim 2, characterized in that, The engagement part (33) is annular and sleeved on the first rotating shaft (34). The engagement part (33) is movably disposed on one of the first gear (31) and the second gear (32) along the second direction. The engagement part (33) moves along the second direction to engage or disengage the first gear (31) and the second gear (32).

4. The dual-motor drive system for vehicles according to claim 1, characterized in that, The dual-motor drive system (1) further includes: a first reduction mechanism (40), which is located on the other side of the first motor (10) along the second direction. The output shaft (11) of the first motor is connected to the first reduction mechanism (40) in a transmission connection. The first reduction mechanism (40) is used to be connected to the first wheel assembly (2) in a transmission connection.

5. The dual-motor drive system for a vehicle according to claim 4, characterized in that, The first deceleration mechanism (40) includes a first transmission part (41) and a second transmission part (42). The first transmission part (41) is connected between the first motor output shaft (11) and the second transmission part (42). The second transmission part (42) is used to be connected to the first wheel assembly (2).

6. The dual-motor drive system for a vehicle according to claim 5, characterized in that, The first transmission unit (41) includes: a plurality of first transmission gears (411), the plurality of first transmission gears (411) being arranged sequentially along the first direction and any two adjacent first transmission gears (411) meshing, one of the plurality of first transmission gears (411) being connected to the first motor output shaft (11) for transmission, and another of the plurality of first transmission gears (411) being connected to the second transmission unit (42); and / or The second transmission unit (42) is a first planetary gear structure. The first sun gear (421) of the first planetary gear structure is connected to the first transmission unit (41) for transmission. The first planet carrier (422) of the first planetary gear structure is used for transmission connection with the first wheel assembly (2).

7. The dual-motor drive system for a vehicle according to any one of claims 1-6, characterized in that, The dual-motor drive system (1) further includes: a second reduction mechanism (50), which is located on one side of the second motor (20) along the second direction. The output shaft (21) of the second motor is connected to the second reduction mechanism (50) in a transmission connection. The second reduction mechanism (50) is used to be connected to the second wheel assembly (3) in a transmission connection.

8. The dual-motor drive system for a vehicle according to claim 7, characterized in that, The second reduction mechanism (50) includes a third transmission part (51) and a fourth transmission part (52). The third transmission part (51) is connected between the output shaft (21) of the second motor and the fourth transmission part (52). The fourth transmission part (52) is used to be connected to the second wheel assembly (3). The second gear (32) is connected to the third transmission part (51).

9. The dual-motor drive system for a vehicle according to claim 8, characterized in that, The third transmission unit (51) includes: a plurality of second transmission gears (511), the plurality of second transmission gears (511) being arranged sequentially along the first direction and any two adjacent second transmission gears (511) meshing with each other; one of the plurality of second transmission gears (511) being connected to the output shaft (21) of the second motor; and another of the plurality of second transmission gears (511) being connected to both the fourth transmission unit (52) and the second gear (32); and / or The fourth transmission unit (52) is a second planetary gear structure. The second sun gear (521) of the second planetary gear structure is connected to the third transmission unit (51) for transmission. The second planet carrier (522) of the second planetary gear structure is used for transmission connection with the second wheel assembly (3).

10. A vehicle, characterized in that, Includes a dual-motor drive system (1) for a vehicle according to any one of claims 1-9.

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