Dual-motor drive axle system and vehicle

Abstract

The utility model discloses a dual-motor drive axle system and a vehicle. A first output shaft of a first drive motor and a second output shaft of a second drive motor are hollow shafts, the second output shaft is arranged on the outer side of the first output shaft in a sleeving mode, and the first output shaft is arranged on the outer side of a half shaft in a sleeving mode; the second output shaft is in transmission connection with the first planetary gear train, and the first output shaft is in disconnectable transmission connection with the first planetary gear train through a first sliding sleeve; the first planetary gear train is in transmission connection with the second planetary gear train, and the second sliding sleeve is used for selecting the first planetary gear train or the second planetary gear train to transmit power to the half shaft. The first output shaft is inserted into the second output shaft, and the half shaft is inserted into the first output shaft, so that the first output shaft, the second output shaft and the half shaft are coaxially arranged, the offset mass is reduced, the impact of an impact load transmitted from a road surface to the electric drive bridge system is reduced, and the anti-fatigue effect of the electric drive bridge system is improved; and the problem of oil leakage caused by breakage of the electric drive axle shell is avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a dual-motor drive axle system and a vehicle. Background Art

[0002] With the continuous development of new energy vehicle technology, electric drive axle systems with high transmission efficiency and high structural integration have become the mainstream structure for vehicle matching.

[0003] The current electric drive axle system usually adopts two integrated solutions: "single motor + reducer + drive axle" and "dual motor + reducer + drive axle". Among them, the rotating shafts of the two motors, the transmission shafts of the reducer and the half shafts of the current dual motor drive axle system are mostly staggered. For the dual motor drive axle system, the larger the offset mass, the larger the eccentricity of the center of mass, and the greater the impact load transmitted from the road surface on the electric drive axle system, which will cause fatigue failure of the electric drive axle system, and then cause the electric drive axle housing to rupture, resulting in oil leakage.

[0004] Therefore, how to provide a dual-motor drive axle system to achieve coaxial arrangement of the motor output shaft and half-shaft and reduce eccentric mass is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of the above problems, the present application provides a dual-motor drive axle system to achieve the coaxial arrangement of the motor output shaft and the half shaft, thereby reducing the eccentric mass. The specific solution is as follows:

[0006] A first aspect of the present application provides a dual-motor drive axle system, comprising:

[0007] A first drive motor, wherein a first output shaft of the first drive motor is a hollow shaft;

[0008] A second drive motor, wherein the second output shaft of the second drive motor is a hollow shaft, and the second output shaft is sleeved on the outer side of the first output shaft;

[0009] A half shaft, wherein the half shaft is connected to the wheels at both sides, and the first output shaft is sleeved on the outer side of the half shaft;

[0010] a motor selection assembly, the motor selection assembly comprising a first planetary gear train and a first sliding sleeve, the first planetary gear train being sleeved on the outer side of the half shaft, the second output shaft being transmission-connected to the first planetary gear train, and the first output shaft being transmission-connected to the first planetary gear train via the first sliding sleeve in a severable manner;

[0011] A shift assembly, the shift assembly includes a second planetary gear train and a second sliding sleeve, the second planetary gear train is sleeved on the outside of the half shaft, and the first planetary gear train is transmission-connected with the second planetary gear train, and the second sliding sleeve is used to select the first planetary gear train or the second planetary gear train to transmit power to the half shaft.

[0012] Preferably, in the above dual-motor drive axle system, the first planetary gear train includes:

[0013] A first sun gear, the first sun gear is connected to the end of the first output shaft, and the first sun gear is sleeved on the outer side of the half shaft;

[0014] A first planetary gear, the first planetary gear is meshed with the first sun gear for transmission;

[0015] A first inner gear ring, the first inner gear ring is meshed with the first planetary gear for transmission, and the first inner gear ring is sleeved on the outer side of the half shaft;

[0016] A first planet carrier, wherein one end of the first planet carrier is connected to the axle of the first planetary wheel, and the other end is provided with a first planet carrier gear, and the first sliding sleeve fixes the axle of the first planetary wheel by connecting the first planet carrier gear and the brake gear.

[0017] Preferably, in the above dual-motor drive axle system, the motor selection component further comprises:

[0018] a second motor output shaft gear, the second motor output shaft gear being arranged at the end of the second output shaft and sleeved on the outer side of the first output shaft, and the first sliding sleeve being connected to the second motor output shaft gear and the first planetary carrier gear to realize the rotation of the axle of the first planetary gear around the first sun gear;

[0019] The second motor output shaft gear, the first planetary carrier gear and the brake gear are arranged side by side in sequence, and the first sleeve can slide along the axial direction of the half shaft to select the second motor output shaft gear or the brake gear to be connected to the first planetary carrier gear.

[0020] Preferably, in the above dual-motor drive axle system, the shift assembly further comprises:

[0021] A synchronizer gear, wherein the synchronizer gear is sleeved on the half shaft, the synchronizer gear is connected to the housing of the differential, and the differential is connected to the half shaft; the second sliding sleeve is used to select the first planetary gear train or the second planetary gear train to be connected to the synchronizer gear.

[0022] Preferably, in the above dual-motor drive axle system, the shift assembly further comprises:

[0023] The second sun gear synchronous ring gear is connected to the first inner ring gear, and the second sun gear synchronous ring gear is sleeved on the outer side of the half shaft, and the second sliding sleeve realizes power transmission between the first planetary gear train and the half shaft by connecting the second sun gear synchronous ring gear and the synchronizer gear.

[0024] Preferably, in the above dual-motor drive axle system, the second planetary gear train includes:

[0025] A second sun gear, the second sun gear is connected to the first inner gear ring, and the second sun gear is sleeved on the outer side of the half shaft;

[0026] A second planetary gear, the second planetary gear is meshed with the second sun gear for transmission;

[0027] a second inner gear ring, the second inner gear ring is meshed with the second planetary gear for transmission;

[0028] a second planet carrier, one end of which is connected to the axle of the second planetary gear, and the other end of which is provided with a second planet carrier synchronous ring gear, and the second sliding sleeve can realize power transmission between the second planetary gear train and the half shaft by connecting the second planet carrier synchronous ring gear and the synchronizer gear;

[0029] The second sun gear synchronous ring gear, the synchronizer gear and the second planet carrier synchronous ring gear are arranged in sequence along the axial direction of the half shaft, and the second sliding sleeve is used to select the second sun gear synchronous ring gear or the second planet carrier synchronous ring gear to be connected to the synchronizer gear.

[0030] A second aspect of the present application provides a vehicle, comprising a dual-motor drive axle system, wherein the dual-motor drive axle system is the dual-motor drive axle system described above.

[0031] Preferably, the above vehicle further comprises:

[0032] A battery is electrically connected to the first drive motor and the second drive motor, and the battery can be charged during the reverse rotation of the first drive motor and the second drive motor.

[0033] Preferably, the above vehicle further comprises:

[0034] A remote information control unit is communicatively connected with the first sliding sleeve and the second sliding sleeve, and is used to control the positions of the first sliding sleeve and the second sliding sleeve.

[0035] Preferably, the above vehicle further comprises:

[0036] A vehicle controller is communicatively connected with the remote information control unit and is used to control the remote information control unit to send control information to the first sliding sleeve and the second sliding sleeve.

[0037] By means of the above-mentioned technical scheme, the first output shaft of the first drive motor and the second output shaft of the second drive motor of the dual-motor drive axle system provided by the present application are both hollow shafts, and the first output shaft is inserted into the second output shaft, and the half-shaft is inserted into the first output shaft, that is, the first output shaft is sleeved on the outside of the half-shaft, and the second output shaft is sleeved on the outside of the first output shaft, so that the first output shaft, the second output shaft and the half-shaft are coaxially arranged, reducing the offset mass, thereby reducing the impact size of the impact load transmitted from the road surface on the electric drive axle system, thereby improving the anti-fatigue effect of the electric drive axle system and avoiding oil leakage problems caused by rupture of the electric drive axle housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0039] Figure 1 A schematic diagram of the structure of a dual-motor drive axle system provided in this application;

[0040] Figure 2 A schematic diagram of the partial structure of the dual-motor drive axle system provided in this application;

[0041] Figure 3 A schematic diagram of the structure of the dual-motor drive axle system provided in the present application in the dual-motor drive 2nd gear state;

[0042] Figure 4 A schematic diagram of the structure of the dual-motor drive axle system provided in the present application in the dual-motor drive 1st gear state;

[0043] Figure 5 A schematic diagram of the structure of the dual-motor drive axle system provided in this application when the single-motor drive is in the 1st gear state;

[0044] Figure 6 This is a schematic diagram of the structure of the dual-motor drive axle system provided in this application when in the single-motor drive 2nd gear state.

[0045] Reference numerals:

[0046] 1 is the first drive motor, 2 is the second drive motor, 31 is the second motor output shaft gear, 32 is the first planetary carrier gear, 33 is the brake gear, 34 is the first sleeve, 41 is the first sun gear, 42 is the first planetary gear, 43 is the first inner ring gear, 44 is the first planetary carrier, 51 is the second sun gear, 52 is the second planetary gear, 53 is the second inner ring gear, 54 is the second planetary carrier, 61 is the second sun gear synchronous ring gear, 62 is the synchronizer ring gear, 63 is the second planetary carrier synchronous ring gear, 64 is the second sleeve, 7 is the differential, 8 is the half shaft, 9 is the wheel-side reducer, and 10 is the wheel. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0048] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0049] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0050] The current electric drive axle system usually adopts two integrated solutions: "single motor + reducer + drive axle" and "dual motor + reducer + drive axle". Among them, the rotating shafts of the two motors, the transmission shaft of the reducer and the half shaft of the drive axle of the current dual motor drive axle system are mostly staggered. For the dual motor drive axle system, the larger the offset mass, the greater the eccentricity of the center of mass, and the greater the impact load transmitted from the road surface on the electric drive axle system, which will cause fatigue failure of the electric drive axle system, and then cause the electric drive axle housing to rupture, resulting in oil leakage.

[0051] Based on the above problems, the present application provides a dual-motor drive axle system, in which the half-shaft, the rotating shafts of the two motors and the transmission shaft of the reducer are coaxially arranged, thereby reducing the mass of the eccentric arrangement of the dual-motor drive system, thereby reducing the impact force of the impact load on the electric drive axle system and alleviating the problem of fatigue failure of the dual-motor drive axle system.

[0052] Combination Figure 1 As shown, the dual-motor drive axle system in the present application includes a first drive motor 1 , a second drive motor 2 , a motor selection component, a shift component, a half shaft 8 , a wheel-side reducer 9 and a wheel 10 .

[0053] Among them, the motor selection component includes: a second motor output shaft gear 31, a first planetary carrier gear 32, a brake gear 33, a first sleeve 34 and a first planetary gear train; the shifting component includes a second planetary gear train, a second sun gear synchronous ring gear 61, a synchronizer ring gear 62, a second planetary carrier synchronous ring gear 63 and a second sleeve 64.

[0054] The first drive motor 1 and the second drive motor 2 can transmit power to the differential 7 through the motor selection component and the shift component. The differential 7 transmits power to the wheels 10 through the half shaft 8 and the wheel-side reducer 9 to realize the driving of the vehicle.

[0055] In some embodiments, the first output shaft of the first drive motor 1 and the second output shaft of the second drive motor 2 are both hollow shafts, and the first output shaft is inserted into the second output shaft, and the half-shaft 8 is inserted into the first output shaft, that is, the first output shaft is sleeved on the outside of the half-shaft 8, and the second output shaft is sleeved on the outside of the first output shaft, so that the first output shaft, the second output shaft and the half-shaft 8 are coaxially arranged and can all rotate relative to each other.

[0056] In the present application, the first output shaft of the first drive motor 1 and the second output shaft of the second drive motor 2 are both hollow shafts, and the first output shaft is inserted into the second output shaft, and the half-shaft 8 is inserted into the first output shaft. Therefore, the coaxial arrangement of the first output shaft, the second output shaft and the half-shaft 8 can be achieved, thereby reducing the offset mass, thereby reducing the impact load transmitted from the road surface on the electric drive axle system, thereby improving the anti-fatigue effect of the electric drive axle system and avoiding the oil leakage problem caused by the rupture of the electric drive axle housing.

[0057] The first planetary gear train includes: a first sun gear 41 , a first planetary gear 42 , a first inner gear ring 43 and a first planet carrier 44 ; the second planetary gear train includes: a second sun gear 51 , a second planetary gear 52 , a second inner gear ring 53 and a second planet carrier 54 .

[0058] The end of the first output shaft of the first drive motor 1 is connected to the first sun gear 41, and the first inner gear ring 43 is rotatably mounted on the half shaft 8. The inner ring of the first inner gear ring 43 is provided with gear teeth, and a first planetary gear 42 is provided between the first inner gear ring 43 and the first sun gear 41. The first planetary gear 42 is meshed with the first sun gear 41 and the first inner gear ring 43 to achieve power transmission.

[0059] The first sun gear 41 , the first planetary gears 42 and the first internal gear ring 43 are meshed and driven to form a first planetary gear structure.

[0060] The end of the second output shaft of the second drive motor 2 is connected with the second motor output shaft gear 31, the first planetary carrier 44 is rotatably sleeved on the outside of the first output shaft, and one end of the first planetary carrier 44 is fixedly connected to the first planetary gear 42, and the other end of the first planetary carrier 44 is provided with the first planetary carrier gear 32. The brake gear 33 is sleeved on the outside of the first planetary carrier 44, along the axis direction of the half shaft 8, the second motor output shaft gear 31, the first planetary carrier gear 32 and the brake gear 33 are arranged side by side in sequence, and the first sliding sleeve 34 is provided on the outside of the first planetary carrier gear 32, the first sliding sleeve 34 can slide along the axis direction of the half shaft 8, and move in the direction toward the second motor output shaft gear 31, so as to realize the transmission connection between the second motor output shaft gear 31 and the first planetary carrier gear 32, and the reverse sliding can realize the transmission connection between the brake gear 33 and the first planetary carrier gear 32.

[0061] Combination Figure 3 and Figure 4 As shown, when the second motor output shaft gear 31 and the first planetary carrier gear 32 are in a transmission connection state, the second motor output shaft gear 31 is connected to the first planetary carrier gear 32, and the first planetary carrier gear 32 is connected to the first planetary gear 42, so that the second drive motor 2 drives the first planetary gear 42 to revolve through the second motor output shaft gear 31 and the first planetary carrier gear 32. The end of the second output shaft of the first drive motor 1 is connected to the first sun gear 41, and the first sun gear 41 drives the first planetary gear 42 to rotate, and the first inner gear ring 43 is driven to rotate through the rotation and revolution of the first planetary gear 42. Thus, the power of the first drive motor 1 and the power of the second drive motor 2 are coupled at the first planetary gear system, and the power output of the dual motors is realized.

[0062] Combination Figure 5 and Figure 6 As shown, when the brake gear 33 and the first planetary carrier gear 32 are in transmission connection state, the second motor output shaft gear 31 is idling, and the first planetary gear 42 is connected to the brake gear 33 through the first planetary carrier 44, so that the position of the first planetary gear 42 is fixed and cannot revolve, and can only realize self-rotation by meshing with the first sun gear 41, that is, the power of the second drive motor 2 cannot be transmitted to the first inner ring gear 43. The power of the first drive motor 1 is transmitted to the first inner ring gear 43 through the first sun gear 41 and the first planetary gear 42, realizing the power output of the first drive motor 1, thereby realizing the driving of only the first drive motor 1.

[0063] It should be noted that the number of teeth of the first planetary gear 42 is smaller than the number of teeth of the first inner gear ring 43 , thereby achieving a reduced speed drive of the first drive motor 1 .

[0064] In the present application, the sliding of the first sliding sleeve 34 can be used to determine whether the power of the second drive motor 2 is transmitted outward. Combined with the first drive motor 1, dual-motor drive or single-motor drive can be achieved to meet different drive requirements.

[0065] The second sun gear 51 is sleeved on the half shaft 8, and the second sun gear 51 is relatively fixedly connected to the first inner gear ring 43 to realize the power transmission of the first inner gear ring 43 to the second sun gear 51. The outer periphery of the second sun gear 51 is meshed with the second inner gear ring 53 through the second planetary gear 52 to realize the power transmission.

[0066] The second sun gear synchronous ring gear 61 is fixedly connected to the second sun gear 51 to achieve that the power of the second sun gear 51 can be transmitted to the second sun gear synchronous ring gear 61, and the second sun gear synchronous ring gear 61 is rotatably sleeved on the half shaft 8; the synchronizer ring gear 62 is sleeved on the half shaft 8 and arranged side by side with the second sun gear synchronous ring gear 61, and the synchronizer ring gear 62 is connected to the housing of the differential 7 to achieve the transmission of power to the differential 7; one end of the second planetary carrier 54 is connected to the second planetary gear 52, and the other end is provided with a second planetary carrier synchronous ring gear 63; along the axial direction of the half shaft 8, the second sun gear synchronous ring gear 61, the synchronizer ring gear 62 and the second planetary carrier synchronous ring gear 63 are arranged side by side in sequence, the initial position of the second sleeve 64 is opposite to the synchronizer ring gear 62, and the second sleeve 64 can slide along the axial direction of the half shaft 8.

[0067] Combination Figure 4 and Figure 5 As shown, during the sliding movement of the second sliding sleeve 64 along the axis direction of the half shaft 8 toward the direction of the second planetary carrier synchronous ring gear 63, power transmission between the second planetary carrier synchronous ring gear 63 and the synchronizer ring gear 62 can be achieved, so that the power of the first internal gear ring 43 is transmitted to the differential 7 through the second sun gear 51, the second planetary gear 52, the second planetary carrier synchronous ring gear 63 and the synchronizer ring gear 62. When the second sliding sleeve 64 in this article connects the second planetary carrier synchronous ring gear 63 and the synchronizer ring gear 62, the dual-motor drive axle system is in the first gear mode.

[0068] Combination Figure 3 and Figure 6 As shown, during the sliding movement of the second sliding sleeve 64 along the axis direction of the half shaft 8 toward the second sun gear synchronous ring gear 61, power transmission between the second sun gear synchronous ring gear 61 and the synchronizer ring gear 62 can be realized, so that the power of the first internal gear ring 43 is transmitted to the differential 7 through the second sun gear synchronous ring gear 61 and the synchronizer ring gear 62. When the second sliding sleeve 64 in this article connects the second sun gear synchronous ring gear 61 and the synchronizer ring gear 62, the dual-motor drive axle system is in the 2nd gear mode.

[0069] The present application can change the rotation speed of the power transmission of the first inner gear ring 43 and realize the switching of different gears by providing the second planetary gear train and the second sliding sleeve 64.

[0070] The power coupling device and reduction device of the dual-motor drive axle system in this application both adopt planetary gear trains, which can ensure smooth power switching and high transmission efficiency; the components are small in size and weight, making it easy to achieve high power density; the mass is small, which is beneficial to improving the handling and comfort of the entire vehicle.

[0071] In addition, the present application also discloses a vehicle, including a dual-motor drive axle system, and the dual-motor drive axle system is the dual-motor drive axle system disclosed in the above-mentioned embodiment. Therefore, the vehicle with the dual-motor drive axle system also has all the above-mentioned technical effects, which will not be repeated here one by one.

[0072] The vehicle in the present application further includes a power battery 11 , a microcontroller unit (MCU) 12 , a telematics control unit (TCU) 13 and a vehicle control unit (VCU) 14 .

[0073] The battery 11 provides a power source for the first drive motor 1 and the second drive motor 2, and stores the power generated by the first drive motor 1 and the second drive motor 2 during the braking process of the vehicle. That is, when the vehicle is braking or going downhill, the rotation of the wheel 10 reversely drives the first drive motor 1 and the second drive motor 2 to generate electricity, thereby charging the battery 11.

[0074] The VCU receives and processes vehicle input information and interacts with various controllers of the system, sends control instructions to the TCU, and the TCU performs the gear shifting action. The VCU also controls the MCU to change the working state of the first drive motor 1 and the second drive motor 2. The dotted lines in the figures of this article are control signal lines, so the VCU and TCU, the VCU and MCU, the VCU and the battery 11, and the TCU and the first and second sliding sleeves are all signal connections.

[0075] The battery 11 is connected to the MCU using positive and negative high-voltage wires, and the MCU is connected to the first drive motor 1 and the second drive motor 2 using three-phase high-voltage wires, respectively.

[0076] Through the above analysis, it can be known that the first sliding sleeve 34 and the second sliding sleeve 64 disclosed in the present application can move along the axial direction of the half shaft 8, so as to realize multiple working modes such as dual-motor two-gear driving, first drive motor two-gear driving and braking recovery of the dual-motor drive axle system.

[0077] The specific working modes and component status are shown in the table below.

[0078] Working Mode First drive motor 1 Second drive motor 2 First slide 34 Second sliding sleeve 64 Dual motor drive 1 gear drive drive Left right Dual motor drive 2 gears drive drive Left Left The first drive motor drives the 1st gear drive Stall right right The first drive motor drives 2 gears drive Stall right Left Dual motor feed 1 gear Power Generation Power Generation Left right Dual motor feed 2 gears Power Generation Power Generation Left Left The first drive motor feeds 1st gear Power Generation Stall right right Second drive motor feed 2 gear Power Generation Stall right Left

[0079] It should be noted that the working mode of the dual-motor drive axle system in this article requires the vehicle controller 14 to make a judgment based on the throttle, brake, vehicle speed and other states and the logic preset in the VCU. When a gear shift is required, the VCU makes the judgment, and the TCU and MCU execute the specific execution, respectively controlling the gear shift mechanism and the motor to work in the correct state, so as to smoothly realize the gear shift process.

[0080] For the switching and selection of the working mode of the dual-motor drive axle system, reference can be made to the control logic of the existing known dual-motor drive axle system, which will not be described in detail in this article. The core of this article is to improve the structure of the dual-motor drive axle system.

[0081] In combination with the above-disclosed dual-motor drive axle system, this article exemplifies the selection of the working mode of the dual-motor drive axle system. Take the acceleration of a vehicle from a stationary start to a high-speed cruising state as an example: after the vehicle is powered on, it enters the dual-motor 1st gear drive mode by default; according to the depth of the driver's depression of the accelerator pedal, the VCU obtains the driver's required torque and vehicle speed, and the MCU determines the relationship between the dual-motor speeds, and controls the dual motors (including the first drive motor 1 and the second drive motor 2) to work in the best high-efficiency zone. When the vehicle accelerates to a certain speed, the VCU sends a request to the TCU to shift up, and the second slide 64 moves to the right (by Figure 1 The vehicle enters the dual motor 2nd gear driving mode to ensure optimal economy. The shifting process is as follows: the MCU controls the dual motors to clear torque, the TCU controls the shift actuator to complete the upshift, and the MCU re-determines the dual motor speed according to the principle of maximum efficiency. When the vehicle enters high-speed steady-state operation and the driving torque demand is not large, the VCU sends a request to enter the single motor 2nd gear driving mode, and the TCU controls the first sliding sleeve 34 to move right (in Figure 1 The first planetary carrier gear 32 is locked, and the vehicle enters a high-speed cruising state.

[0082] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0083] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-motor drive axle system, characterized in that: include: A first drive motor, wherein a first output shaft of the first drive motor is a hollow shaft; A second drive motor, wherein the second output shaft of the second drive motor is a hollow shaft, and the second output shaft is sleeved on the outer side of the first output shaft; A half shaft, wherein the half shaft is connected to the wheels at both sides, and the first output shaft is sleeved on the outer side of the half shaft; a motor selection assembly, the motor selection assembly comprising a first planetary gear train and a first sliding sleeve, the first planetary gear train being sleeved on the outer side of the half shaft, the second output shaft being transmission-connected to the first planetary gear train, and the first output shaft being transmission-connected to the first planetary gear train via the first sliding sleeve in a severable manner; A shift assembly, the shift assembly includes a second planetary gear train and a second sliding sleeve, the second planetary gear train is sleeved on the outside of the half shaft, and the first planetary gear train is transmission-connected with the second planetary gear train, and the second sliding sleeve is used to select the first planetary gear train or the second planetary gear train to transmit power to the half shaft.

2. The dual-motor drive axle system according to claim 1, characterized in that: The first planetary gear train comprises: A first sun gear, the first sun gear is connected to the end of the first output shaft, and the first sun gear is sleeved on the outer side of the half shaft; A first planetary gear, the first planetary gear is meshed with the first sun gear for transmission; A first inner gear ring, the first inner gear ring is meshed with the first planetary gear for transmission, and the first inner gear ring is sleeved on the outer side of the half shaft; A first planet carrier, wherein one end of the first planet carrier is connected to the axle of the first planetary wheel, and the other end is provided with a first planet carrier gear, and the first sliding sleeve fixes the axle of the first planetary wheel by connecting the first planet carrier gear and the brake gear.

3. The dual-motor drive axle system according to claim 2, characterized in that: The motor selection component also includes: a second motor output shaft gear, the second motor output shaft gear being arranged at the end of the second output shaft and sleeved on the outer side of the first output shaft, and the first sliding sleeve being connected to the second motor output shaft gear and the first planetary carrier gear to realize the rotation of the axle of the first planetary gear around the first sun gear; The second motor output shaft gear, the first planetary carrier gear and the brake gear are arranged side by side in sequence, and the first sleeve can slide along the axial direction of the half shaft to select the second motor output shaft gear or the brake gear to be connected to the first planetary carrier gear.

4. The dual-motor drive axle system according to claim 2, characterized in that: The shift assembly further comprises: A synchronizer gear, wherein the synchronizer gear is sleeved on the half shaft, the synchronizer gear is connected to the housing of the differential, and the differential is connected to the half shaft; the second sliding sleeve is used to select the first planetary gear train or the second planetary gear train to be connected to the synchronizer gear.

5. The dual-motor drive axle system according to claim 4, characterized in that: The shift assembly further comprises: The second sun gear synchronous ring gear is connected to the first inner ring gear, and the second sun gear synchronous ring gear is sleeved on the outer side of the half shaft, and the second sliding sleeve realizes power transmission between the first planetary gear train and the half shaft by connecting the second sun gear synchronous ring gear and the synchronizer gear.

6. The dual-motor drive axle system according to claim 5, characterized in that: The second planetary gear train comprises: A second sun gear, the second sun gear is connected to the first inner gear ring, and the second sun gear is sleeved on the outer side of the half shaft; A second planetary gear, the second planetary gear is meshed with the second sun gear for transmission; a second inner gear ring, the second inner gear ring is meshed with the second planetary gear for transmission; a second planet carrier, one end of which is connected to the axle of the second planetary gear, and the other end of which is provided with a second planet carrier synchronous ring gear, and the second sliding sleeve can realize power transmission between the second planetary gear train and the half shaft by connecting the second planet carrier synchronous ring gear and the synchronizer gear; The second sun gear synchronous ring gear, the synchronizer gear and the second planet carrier synchronous ring gear are arranged in sequence along the axial direction of the half shaft, and the second sliding sleeve is used to select the second sun gear synchronous ring gear or the second planet carrier synchronous ring gear to be connected to the synchronizer gear.

7. A vehicle comprising a dual motor drive axle system, characterized in that: The dual-motor drive axle system is the dual-motor drive axle system as claimed in any one of claims 1 to 6.

8. The vehicle according to claim 7, characterized in that Also includes: A battery is electrically connected to the first drive motor and the second drive motor, and the battery can be charged during the reverse rotation of the first drive motor and the second drive motor.

9. The vehicle according to claim 7, characterized in that Also includes: A remote information control unit is communicatively connected with the first sliding sleeve and the second sliding sleeve, and is used to control the positions of the first sliding sleeve and the second sliding sleeve.

10. The vehicle according to claim 9, characterized in that Also includes: A vehicle controller is communicatively connected with the remote information control unit and is used to control the remote information control unit to send control information to the first sliding sleeve and the second sliding sleeve.

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