Electric drive axle assembly, gear shifting method and electric drive axle working method

Abstract

The invention relates to an electric drive axle assembly, a gear shifting method and an electric drive axle working method. The electric drive axle assembly is used for converting electric energy into mechanical energy and driving a vehicle to advance and comprises a driving motor assembly and at least one driving motor, the driving motor is matched with a speed reducer, and the speed reducer achieves multi-stage speed reduction through cooperation of a planet row and a cylindrical gear so as to cover the working condition requirement of the whole vehicle; the gear shifting assembly comprises a gear shifting tooth holder and a gear shifting tooth sleeve; the differential mechanism assembly comprises a differential mechanism and is used for distributing torque; the power output assembly comprises half shafts located on the two sides of the differential mechanism, and power is transmitted to wheels through the differential mechanism and the half shafts. According to the electric drive axle assembly, the driving motor assembly is matched with the gear shifting assembly, and the planet row is matched with the cylindrical gear to transmit power, so that switching of different gears is achieved, and different working condition requirements of a vehicle are met.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive axles, and in particular to an electric drive axle assembly, a shifting method, and an electric drive axle working method. Background Art

[0002] With the rapid advancement of global science and technology and the significant increase in public environmental awareness, the new energy vehicle industry is booming at an unprecedented rate. Technological innovation in this field is changing with each passing day, driving the automotive industry to transform in a greener and more efficient direction. Against this backdrop, the electric drive axle, as a core technical component in new energy vehicles, is increasingly used in the commercial vehicle field, becoming the key link between the battery pack and the wheel.

[0003] As the name implies, the electric drive axle is the "power heart" of new energy vehicles. It undertakes the important task of efficiently converting the electrical energy in the battery pack into mechanical energy, thereby driving the vehicle forward. Through advanced power electronics technology and precise mechanical structure design, the electric drive axle can achieve precise control of vehicle power output, allowing new energy vehicles to gradually approach or even surpass traditional fuel vehicles in performance.

[0004] However, despite the continuous expansion of the application scope of electric drive axles, their technological development still faces many challenges. In the actual use of new energy vehicles, vehicles need to adapt to a variety of complex working conditions. For example, when driving on the highway, the vehicle needs to maintain a high speed to reach the destination quickly and safely; when driving on rugged mountain roads, the vehicle needs to have a stronger power output to overcome complex and changeable road conditions. However, existing electric drive axle designs often find it difficult to meet these two completely different needs at the same time. How to ensure the stability of the vehicle at high speed while providing sufficient power support under complex road conditions has become a major problem that needs to be solved in the development of electric drive axle technology.

[0005] In addition, the design of the electric drive axle also needs to fully consider the structural layout and space utilization efficiency of the transmission system. As an important part of the electric drive axle, the rationality of the structural design of the transmission system directly affects the working efficiency and reliability of the electric drive axle. How to reasonably arrange the various components of the transmission system in a limited space to ensure that they can work closely together and operate efficiently is another major challenge in the design process of the electric drive axle. At the same time, in order to improve the overall performance of the vehicle and reduce costs, the various components of the electric drive axle also need to be installed as compactly as possible to reduce the impact on the overall layout of the vehicle.

[0006] In summary, with the rapid development of the new energy vehicle industry, the electric drive axle, as a key technical component, has become a key issue to be urgently addressed in the current research on electric drive axle technology, as to how to optimize the structural layout and space utilization efficiency of the transmission system while meeting the requirements of different vehicle working conditions. Summary of the invention

[0007] Based on this, it is necessary to provide an electric drive axle assembly, a shifting method and an electric drive axle working method to address the problem that existing electric drive axles are difficult to simultaneously meet the vehicle speed and power requirements under different working conditions.

[0008] An electric drive axle assembly, used to convert electrical energy into mechanical energy and drive a vehicle forward, comprising:

[0009] A drive motor assembly includes at least one drive motor, which is matched with a reducer. The reducer realizes multi-stage reduction through the cooperation of a planetary gear and a cylindrical gear to meet the working conditions of the whole vehicle;

[0010] A shift assembly, including a shift gear seat and a shift gear sleeve;

[0011] A differential assembly, including a differential, is used to distribute torque;

[0012] The power output assembly includes half shafts located on both sides of the differential. The power is transmitted to the wheels through the differential and the half shafts.

[0013] In one embodiment, the drive motor assembly includes a single motor to form a single-motor electric drive axle assembly.

[0014] In one of the embodiments, the single motor is matched with a reducer, which includes a planetary gear and a three-stage cylindrical gear transmission system; when the shift assembly switches to a high gear, a second-stage reduction is achieved by the planetary gear in combination with the first-stage cylindrical gear; when the shift assembly switches to a low gear, a fourth-stage reduction is achieved by the planetary gear in combination with the three-stage cylindrical gear.

[0015] In one embodiment, the drive motor assembly includes dual motors to form a dual-motor electric drive axle assembly.

[0016] In one of the embodiments, one of the two motors is matched with a reducer, and a primary planetary gear is used in conjunction with a primary cylindrical gear to achieve secondary reduction and a fixed speed ratio, so as to achieve a shifting process without power interruption;

[0017] Another motor in the dual motors is matched with another reducer, and the other reducer includes a planetary gear and a three-stage cylindrical gear transmission system. When the shift assembly switches to a high gear, a second-stage reduction is achieved by the planetary gear and the first-stage cylindrical gear. When the shift assembly switches to a low gear, a fourth-stage reduction is achieved by the planetary gear and the three-stage cylindrical gear.

[0018] In one embodiment, the structure of the planetary gear train includes a ring gear, planetary gears, a planet carrier and a sun gear.

[0019] In one of the embodiments, the planetary gear is embedded in the motor housing to reduce the size of the electric drive axle assembly.

[0020] In one of the embodiments, during the gear shifting process, the gear shift sleeve and the gear shift seat are engaged, and the gear shift seat is used to ensure the positioning and operation of the gear sleeve during the gear shifting process.

[0021] A shifting method of an electric drive axle assembly, using the above-mentioned electric drive axle assembly to shift gears, the process is as follows:

[0022] The drive motor assembly and the shift assembly work together to transmit power through the planetary gears and cylindrical gears to achieve switching between different gears to meet the different working conditions of the vehicle.

[0023] A method for operating an electric drive axle is disclosed, wherein at least one drive motor in the above-mentioned drive motor assembly is used to provide power, and the electric drive axle assembly is used to convert the electrical energy provided by the drive motor into mechanical energy for driving the vehicle forward.

[0024] The above-mentioned electric drive axle assembly transmits power through planetary gears and cylindrical gears to achieve switching between different gears, so as to achieve the shortest transmission path and the best speed ratio for each gear, so that the drive motor works in the optimal efficiency range, thereby meeting the different working conditions of the vehicle; at the same time, the planetary gear structure is embedded in the motor housing to rationally utilize the space and make the size of the electric drive axle assembly smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic diagram of the structure of an electric drive axle assembly provided in one embodiment of the present application.

[0026] FIG. 2 is a schematic diagram of the structure of an electric drive axle assembly provided in another embodiment of the present application. Description of Reference Numerals

[0027] 1. First drive motor; 2. First ring gear; 3. First planetary gear; 4. First planet carrier; 5. First sun gear; 6. First driving cylindrical gear; 7. First driven cylindrical gear; 8. Second ring gear; 9. Second planetary gear; 10. Second planet carrier; 11. Second sun gear; 12. Second driving cylindrical gear; 13. Second driven cylindrical gear; 14. Shifting gear seat; 15. Shifting gear sleeve; 16. Third driving cylindrical gear; 17. Third driven cylindrical gear; 18. Fourth driving cylindrical gear; 19. Differential; 20. Second drive motor; 21. Half shaft; 22. Wheel. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0034] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of an electric drive axle assembly in an embodiment of the present application. In some embodiments, an electric drive axle assembly is provided, which includes a drive motor assembly, in which only one second drive motor 20 is provided, and the second drive motor 20 is matched with a corresponding reducer, and the reducer includes a planetary gear and a three-stage cylindrical gear transmission system; specifically, a first-stage planetary gear is used in conjunction with a three-stage cylindrical gear to achieve a four-stage reduction; a first-stage planetary gear is used in conjunction with a first-stage cylindrical gear to achieve a two-stage reduction, so as to achieve the shortest transmission path for each gear and the best speed ratio;

[0035] Also includes:

[0036] The shift assembly includes a shift gear seat 14 and a shift gear sleeve 15; the differential assembly includes a differential 19 for distributing torque; the power output assembly includes half shafts 21 located on both sides of the differential 19, and the power is transmitted to the wheels 22 via the differential 19 and the half shafts 21.

[0037] Refer to FIG. 1 , in which the electric drive axle assembly is configured as a double-bridge single-motor configuration, and the double-bridge single-motor configuration of the electric drive axle assembly can be adapted to a 6×4 vehicle model.

[0038] Referring to FIG. 2 , FIG. 2 shows a schematic diagram of the structure of an electric drive axle assembly in another embodiment of the present application. In some embodiments, an electric drive axle assembly is provided, which includes a drive motor assembly, the drive motor assembly including a first drive motor 1 and a second drive motor 20; also includes a shift assembly, including a shift gear seat 14 and a shift gear sleeve 15; a differential assembly, including a differential 19 for distributing torque; a power output assembly, including half shafts 21 located on both sides of the differential 19, and power is transmitted to wheels 22 via the differential 19 and the half shafts 21.

[0039] The first drive motor 1 is matched with the first reducer to have a fixed speed ratio; the first reducer realizes speed reduction through the first planetary gear and the first cylindrical gear, and the first planetary gear includes the first ring gear 2, the first planetary gear 3, the first planet carrier 4, and the first sun gear 5;

[0040] The second drive motor 20 is matched with a second reducer, and the second reducer includes a second planetary gear and a three-stage cylindrical gear transmission system, which can realize a second-stage reduction by a first-stage planetary gear and a first-stage cylindrical gear, and can also realize a fourth-stage reduction by a first-stage planetary gear and a three-stage cylindrical gear, thereby combining three gear modes to cover all working conditions of the vehicle; specifically, the second planetary gear includes a second ring gear 8, a second planetary gear 9, a second planet carrier 10 and a second sun gear 11;

[0041] The gear shift assembly also includes a gear shifting assembly, which includes a gear shifting gear seat 14 and a gear shifting gear sleeve 15. The gear shifting gear seat 14 is used to fix and support the gear shifting mechanism, and can ensure the accurate positioning and stable operation of the gear shifting gear sleeve 15 during the gear shifting process; the gear shifting gear sleeve 15 is closely matched with the gear shifting gear seat 14 to ensure smooth meshing between the gear shifting gear sleeve 15 and the gear shifting gear seat 14, thereby achieving smooth gear shifting and efficient transmission of the vehicle under different working conditions;

[0042] It also includes a differential assembly, which includes a differential 19 for distributing torque; a power output assembly, which includes half shafts 21 located on both sides of the differential 19, and the power is transmitted to the wheels 22 via the differential 19 and the half shafts 21.

[0043] Specifically, the first planetary gear and the second planetary gear each include a ring gear, a planetary gear, a planetary carrier and a sun gear; Sun gear: Located at the center of the planetary row, it serves as the driving gear to receive power input. The sun gear meshes with the planetary gears through its teeth to transmit power. Planetary gears: Supported by the fixed shaft of the planetary carrier, the planetary gears are allowed to rotate on the supporting shaft while also revolving around the central axis of the sun gear. The planetary gears are in a constant meshing state with the adjacent sun gear and ring gear. Ring gear: An internal gear that is constantly meshed with the planetary gears. The meshing of the ring gear and the planetary gears allows power to be transmitted from the sun gear to the ring gear, or the size and number of teeth of the ring gear determine the speed and torque of the output shaft. Planetary carrier: One of the main components of the planetary gear transmission device. The planetary gear shaft or bearing is installed on the planetary carrier. The planetary carrier adjusts the path and speed of power transmission by connecting the sun gear and the ring gear to achieve the function of automatic shifting. After receiving the power input, the sun gear meshes with the planetary gears through its teeth to transmit the power to the planetary gears. The planetary gears then mesh with the ring gear to transmit the power to the ring gear, or output through the output shaft of the planetary carrier. In this way, a closed loop of power transmission is formed between the sun gear, the planetary gears and the ring gear.

[0044] In some embodiments, three gear modes can be realized by the cooperation of the first drive motor 1, the second drive motor 20, the first reducer and the second reducer, and the three gear modes are used to cover all working conditions of the vehicle;

[0045] In some embodiments, the first drive motor 1 has a fixed speed ratio, and the power is output by the first drive motor 1 and transmitted to the first driving cylindrical gear 6 via the first sun gear 5, the first planetary gear 3, and the first planetary carrier 4, and then transmitted to the first driven cylindrical gear 7 meshing with the first driving cylindrical gear 6, and finally coupled with the power output by the second drive motor 20 and output to the differential 19, and then transmitted to the wheel 22 through the half shaft 21; wherein, the fixed speed ratio of the first drive motor 1 can ensure that there is no power interruption during the gear shifting process.

[0046] In some embodiments, the three gear modes include first gear, second gear and neutral gear;

[0047] Furthermore, the first gear is realized as follows: the shifting gear sleeve 15 moves horizontally toward the third driven cylindrical gear 17 until the shifting gear sleeve 15 meshes with the shifting teeth of the third driven cylindrical gear 17. At this time, the transmission route of the power output by the second drive motor is as follows: the power is output by the second drive motor 20 and then transmitted to the shifting gear sleeve 15 through the second sun gear 11, the second planetary gear 9, the second planetary carrier 10, the second driving cylindrical gear 12, the second driven cylindrical gear 13, the third driving cylindrical gear 16, and the third driven cylindrical gear 17, and then transmitted to the fourth driving cylindrical gear 18 through the shifting gear seat 14, and then transmitted to the first driven cylindrical gear 7 meshing with the fourth driving cylindrical gear 18, and finally coupled with the power output by the first drive motor and output to the differential 19, and then transmitted to the wheel 22 through the half shaft 21. In the first gear working mode, four-stage deceleration can be achieved to meet the large torque requirements of the whole vehicle;

[0048] Furthermore, the second gear is realized as follows: the shifting gear sleeve 15 moves horizontally toward the second driving cylindrical gear 12 until the shifting gear sleeve 15 meshes with the shifting teeth of the second driving cylindrical gear 12. At this time, the transmission route of the power output by the second drive motor is as follows: the power is output by the second drive motor 20 and then transmitted to the fourth driving cylindrical gear 18 through the second sun gear 11, the second planetary gear 9, and the second planetary carrier 10, and then transmitted to the first driven cylindrical gear 7 meshing with the fourth driving cylindrical gear 18, and finally coupled with the power output by the first drive motor and output to the differential 19, and then transmitted to the wheel 22 through the half shaft 21. In the second gear working mode, the second power component can achieve two-stage deceleration to meet the high speed requirements of the whole vehicle;

[0049] Furthermore, the neutral gear is realized as follows: the second drive motor 20 is in neutral gear, at which time the shift sleeve 15 is in the position shown in FIG. 1 and does not move, the first drive motor 1 works alone, and the power is output by the first drive motor 1 and transmitted to the first driving cylindrical gear 6 through the first sun gear 5, the first planetary gear 3, and the first planetary carrier 4, and then transmitted to the first driven cylindrical gear 7 meshing with the first driving cylindrical gear 6, and finally output to the differential 19, and then transmitted to the wheel 22 through the half shaft 21, so that the whole bridge realizes secondary reduction.

[0050] In some embodiments, the working method of the electric drive axle assembly in the present application is as follows: when starting at a low speed, the second drive motor 20 is in the first gear, and the first drive motor 1 provides torque to start the vehicle; when accelerating, the second drive motor 20 switches to the second gear, and together with the first drive motor 1 provides power for acceleration; when cruising at high speed, the second drive motor 20 is in neutral gear, and is driven solely by the first drive motor 1;

[0051] This application realizes multiple working modes through three gears, so that the motor can work fully in the high-efficiency area, and combined with dual-motor torque distribution, it can improve the system efficiency performance.

[0052] Refer to FIG. 2 , in which the electric drive axle assembly is configured as a single-bridge dual-motor configuration, and the electric drive axle assembly of the single-bridge dual-motor configuration can be adapted to 4×2 vehicles.

[0053] In a specific embodiment, the planetary gear is embedded in the motor housing to reduce the size of the electric drive axle assembly.

[0054] In a specific embodiment, the first reducer adopts a first-stage planetary gear in combination with a first-stage cylindrical gear to achieve two-stage reduction, with a fixed speed ratio and no power interruption during gear shifting; the second reducer adopts a first-stage planetary gear in combination with a third-stage cylindrical gear to achieve four-stage reduction in gear I, and adopts a first-stage planetary gear in combination with a first-stage cylindrical gear to achieve two-stage reduction in gear II, thereby achieving the shortest transmission path for each gear, the optimal speed ratio, and the motor operating in the optimal efficiency range.

[0055] In a specific embodiment, the first drive motor 1 and the second drive motor 20 are arranged on the same side, and the two drive motors are arranged on the left or right side of the reducer.

[0056] In a specific embodiment, the first drive motor 1 and the second drive motor 20 are arranged on opposite sides, and the first drive motor 1 and the second drive motor 20 arranged on opposite sides are respectively located on both sides to achieve weight balance.

[0057] In a specific embodiment, the drive motor and the reducer may share a housing and a cooling and heat dissipation system, and may share a cavity and oil with the reducer housing, or may share a cavity but not oil, or may use independent cooling and heat dissipation systems separately;

[0058] The drive motor and reducer are set in the same housing to achieve a high degree of integration, which not only reduces the number of parts and the complexity of the system, but also makes the entire powertrain more compact and lighter, thereby improving the vehicle's energy efficiency and endurance.

[0059] The drive motor and reducer can share a cooling and heat dissipation system to achieve a common cavity and common oil design. This design can make full use of the circulation of coolant to efficiently dissipate heat from the drive motor and reducer, ensuring that they can maintain stable performance even when running under high load. At the same time, the common cavity and common oil design can also reduce the amount of coolant used, reducing the energy consumption and cost of the system;

[0060] Alternatively, it also includes a cooling and heat dissipation method in which the drive motor and the reducer share a cavity but do not share oil. In this method, due to the characteristic of not sharing oil, it is possible to ensure the heat dissipation effect while avoiding mutual contamination of coolant between different components, thereby improving the reliability and durability of the system.

[0061] In a specific embodiment, the axle housing of the electric drive axle assembly of the present application can adopt an integral punched and welded axle housing, borrowing the production resources of traditional axles;

[0062] Alternatively, in a specific embodiment, the bridge housing of the electric drive axle assembly of the present application may adopt a segmented cast bridge housing to achieve an integrated optimized design of the housing.

[0063] In a specific embodiment, the reducer housing and the motor housing of the present application can be made into an integrated housing to improve system integration;

[0064] Alternatively, in a specific embodiment, the reducer housing and the motor housing of the present application can be made into two independent housings to improve the convenience of installation and maintenance.

[0065] In a specific embodiment, the parameters of the driving cylindrical gear on the output shaft system of the first drive motor 1 can be the same as the parameters of the driving cylindrical gear on the output shaft system of the second drive motor 20 to achieve the same torque output;

[0066] Alternatively, in a specific embodiment, the parameters of the driving cylindrical gear on the output shaft system of the first driving motor 1 may be different from the parameters of the driving cylindrical gear on the output shaft system of the second driving motor 20 to achieve different torque outputs.

[0067] In a specific embodiment, the power source of the shift actuator used in the shift assembly of the present application may be electric;

[0068] Alternatively, the power source of the shift actuator used in the shift assembly of the present application may be pneumatic;

[0069] Alternatively, the power source of the shift actuator used in the shift assembly of the present application may be hydraulic shifting.

[0070] The electric drive axle assembly of the present application transmits power through a planetary gear and a cylindrical gear to achieve switching of different gears, so as to achieve the shortest transmission path and the best speed ratio for each gear, so that the drive motor operates in the optimal efficiency range, thereby meeting the different working conditions of the vehicle.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An electric drive axle assembly, used to convert electrical energy into mechanical energy and drive a vehicle forward, characterized in that: include: A drive motor assembly includes at least one drive motor, which is matched with a reducer. The reducer realizes multi-stage reduction through the cooperation of a planetary gear and a cylindrical gear to meet the working conditions of the whole vehicle; A shift assembly, including a shift gear seat and a shift gear sleeve; A differential assembly, including a differential, is used to distribute torque; The power output assembly includes half shafts located on both sides of the differential. The power is transmitted to the wheels through the differential and the half shafts.

2. The electric drive axle assembly according to claim 1, characterized in that: The drive motor assembly includes a single motor to form a single-motor electric drive axle assembly.

3. The electric drive axle assembly according to claim 2, characterized in that: The single motor is matched with a reducer, which includes a planetary gear and a three-stage cylindrical gear transmission system; When the shift assembly switches to high gear, the planetary gearbox cooperates with the primary cylindrical gear to achieve secondary deceleration; When the shift assembly switches to low gear, four-stage reduction is achieved through the planetary gear combination with the three-stage cylindrical gear.

4. The electric drive axle assembly according to claim 1, characterized in that: The drive motor assembly includes dual motors to form a dual-motor electric drive axle assembly.

5. The electric drive axle assembly according to claim 4, characterized in that: One of the dual motors is matched with a reducer, and a primary planetary gear is used in conjunction with a primary cylindrical gear to achieve secondary reduction and a fixed speed ratio, so as to achieve a shifting process without power interruption; Another motor in the dual motors is matched with another reducer, and the other reducer includes a planetary gear and a three-stage cylindrical gear transmission system. When the shift assembly switches to a high gear, a second-stage reduction is achieved by the planetary gear and the first-stage cylindrical gear. When the shift assembly switches to a low gear, a fourth-stage reduction is achieved by the planetary gear and the three-stage cylindrical gear.

6. The electric drive axle assembly according to claim 3 or 5, characterized in that: The structure of the planetary gear train includes a ring gear, planetary gears, a planet carrier and a sun gear.

7. The electric drive axle assembly according to claim 6, characterized in that: The planetary gear is embedded in the motor housing to reduce the size of the electric drive axle assembly.

8. The electric drive axle assembly according to claim 1, characterized in that: During the gear shifting process, the gear shift sleeve and the gear shift seat are engaged, and the gear shift seat is used to ensure the positioning and operation of the gear sleeve during the gear shifting process.

9. A shifting method for an electric drive axle assembly, characterized in that: The process of shifting gears using the electric drive axle assembly as described in any one of claims 1 to 8 is as follows: The drive motor assembly and the shift assembly work together to transmit power through the planetary gears and cylindrical gears to achieve switching between different gears to meet the different working conditions of the vehicle.

10. An electric drive bridge working method, characterized in that: Power is provided by at least one drive motor in the drive motor assembly, and the electric drive axle assembly as described in any one of claims 1 to 8 is used to convert the electrical energy provided by the drive motor into mechanical energy for driving the vehicle forward.

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