Multi-gear electric drive axle transmission device

Abstract

The invention discloses a multi-gear electric drive axle transmission device. Comprising a main motor, an auxiliary motor, a first half shaft, a second half shaft, a first clutch, a limited slip differential assembly connected with the first half shaft and the second half shaft, an intermediate shaft receiving power from the main motor and a first-gear transmission mechanism. The synchronizer is arranged on the intermediate shaft and selectively combined with the first-gear transmission mechanism and the second-gear transmission mechanism, and the first-gear transmission mechanism and the second-gear transmission mechanism are arranged to be used for transmitting power to the limited slip differential assembly. The first clutch is arranged to be used for controlling combination and separation between the auxiliary motor and the limited slip differential assembly. According to the multi-gear electric drive axle transmission device, the main motor and the auxiliary motor are combined, switching of three gears can be achieved, the main motor works in the normal running process, the double motors work at the same time in the climbing or accelerating process, the auxiliary motor works at the high speed, it can be guaranteed that the driving motor operates in the high-efficiency interval to the maximum extent, and the driving efficiency is improved. The high-efficiency interval of the motor is expanded, and the endurance mileage is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive axles, and in particular, relates to a multi-speed electric drive axle transmission device. Background Art

[0002] At present, rear-wheel drive electric axles have been rapidly applied in the fields of logistics vehicles and pickup trucks. The existing electric axles all adopt a single-speed structure, which cannot take into account the efficient operation of the motor in the two major working conditions of low-speed starting and high-speed driving. There are problems such as high requirements for the drive motor, insufficient power, and poor economy.

[0003] The Chinese patent application number 202310039177.1 discloses an electric drive axle transmission system, which realizes power output by dual motors with different speed ratios, so that the motors can fully work in the high-efficiency zone, improve the driving experience, and the vehicle layout is simple and low-cost. It includes: two motors, specifically EM-A motor and EM-B motor, EM-A motor is the driving motor of the main box, and EM-B motor is the driving motor of the auxiliary box; a reduction gear assembly; a set of two-speed gear assemblies; a set of planetary gear assembly, which includes a main reduction gear, a sun gear shaft, a sun gear, a planetary gear, and a planet carrier, the sun gear shaft is a hollow shaft, the input end of the sun gear shaft is equipped with the main reduction gear, and the output end of the sun gear shaft is fixed with a sun gear; a differential; and two half shafts, respectively a left half shaft and a right half shaft; the output end of the EM-B motor is connected to the input teeth of the reduction gear assembly, the output teeth of the reduction gear assembly are meshed and connected to the main reduction gear, and the outer circumference of the non-half shaft output end of the housing of the differential is fixed with a planet carrier.

[0004] It is desirable to provide an improved multi-speed electric drive axle transmission, particularly with regard to how to expand the high efficiency range of the motor and increase the cruising range. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a multi-speed electric drive axle transmission device, the purpose of which is to expand the high efficiency range of the motor and improve the cruising range.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-speed electric drive axle transmission device, including a main motor, an auxiliary motor, a first half shaft, a second half shaft, a first clutch, a limited slip differential assembly connected to the first half shaft and the second half shaft, an intermediate shaft receiving power from the main motor, a first gear transmission mechanism, a second gear transmission mechanism and a synchronizer arranged on the intermediate shaft and selectively combined with the first gear transmission mechanism and the second gear transmission mechanism, the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the limited slip differential assembly, and the first clutch is arranged to control the combination and separation between the auxiliary motor and the limited slip differential assembly.

[0007] The limited slip differential assembly includes a sun gear, a planet carrier, a differential ring gear, an inner planetary gear meshing with the sun gear, an outer planetary gear meshing with the inner planetary gear, and a differential ring gear meshing with the outer planetary gear, the inner planetary gear and the outer planetary gear are arranged on the planet carrier, and the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the differential ring gear.

[0008] The first gear transmission mechanism comprises a first gear driving gear, which is arranged on the intermediate shaft, and the first gear transmission mechanism is meshed with the differential gear ring.

[0009] The second-gear transmission mechanism comprises a meshing second-gear driving gear and a second-gear driven gear, the second-gear driving gear is arranged on the intermediate shaft, and the second-gear transmission mechanism is connected to the differential gear ring.

[0010] The synchronizer is located between the first-gear driving gear and the second-gear driving gear.

[0011] The limited slip differential assembly also includes a second clutch connected to the first half shaft and the second half shaft.

[0012] The second clutch is a dog clutch.

[0013] The limited slip differential assembly also includes a first support frame and a second support frame connected to the differential ring gear, the first half shaft passes through the first support frame, the second half shaft passes through the second support frame, and the first clutch is configured to control the engagement and separation between the auxiliary motor and the second support frame.

[0014] The main motor is connected to the main input shaft, and the main input shaft is connected to the intermediate shaft through a power transmission mechanism.

[0015] The power transmission mechanism is a gear transmission mechanism.

[0016] The multi-speed electric drive axle transmission device of the present invention combines a main motor with an auxiliary motor and can realize switching of three gears. The main motor works during normal driving, the two motors work simultaneously during climbing or accelerating, and the auxiliary motor works at high speed, which can maximize the guarantee that the drive motor operates in a high efficiency range, expand the high efficiency range of the motor, and improve the cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] This specification includes the following drawings, which show the following contents:

[0018] Figure 1 It is a structural schematic diagram of the multi-speed electric drive axle transmission device of the present invention;

[0019] Figure 2 It is a power flow chart of the first gear;

[0020] Figure 3 This is the second gear power flow chart;

[0021] Figure 4 It is a three-speed power flow chart;

[0022] Figure 5 It is the reverse gear power flow chart;

[0023] Figure 6 It is the limited slip force flow chart;

[0024] Figure 7 It is the parking power flow chart;

[0025] The markings in the figure are: 1. first half shaft; 2. main motor; 3. first gear; 4. intermediate shaft; 5. second gear; 6. first gear driving gear; 7. synchronizer; 8. second gear driving gear; 9. differential ring gear; 10. second gear driven gear; 11. planetary carrier; 12. outer planetary gear; 13. inner planetary gear; 14. sun gear; 15. auxiliary motor; 16. second half shaft; 17. second clutch; 18. first clutch; 19. parking mechanism; 20. second support frame; 21. first support frame; 100. limited slip differential assembly; 200. output shaft assembly. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0027] The following will refer to Table 1 and Figures 1 to 6 The transmission device is described in detail. Meanwhile, it should be noted that in the following description of the present invention, the clutch working means that the clutch connects the two components, and the clutch not working means that the two components are separated. It should be noted that in the following embodiments, the "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent a sequential execution order, but are only for the convenience of description.

[0028] like Figures 1 to 7As shown, the present invention provides a multi-speed electric drive axle transmission device, including a main motor 2, an auxiliary motor 15, a first half shaft 1, a second half shaft 16, a first clutch 18, a limited slip differential assembly 100 connected to the first half shaft 1 and the second half shaft 16, an intermediate shaft 4 receiving power from the main motor 2, a first gear transmission mechanism, a second gear transmission mechanism, and a synchronizer 7 arranged on the intermediate shaft 4 and selectively combined with the first gear transmission mechanism and the second gear transmission mechanism, the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the limited slip differential assembly 100, and the first clutch 18 is arranged to control the combination and separation between the auxiliary motor 15 and the limited slip differential assembly 100.

[0029] Specifically, if Figures 1 to 7 As shown, the main motor 2 is connected to the main input shaft, and the main input shaft is connected to the intermediate shaft 4 through a power transmission mechanism. The axis of the main input shaft is parallel to the axis of the intermediate shaft 4. The main motor 2 drives the main input shaft to rotate, and the main input shaft transmits power to the intermediate shaft 4 through the power transmission mechanism, driving the intermediate shaft 4 to rotate. The main motor 2 and the auxiliary motor 15 and the first half shaft 1 and the second half shaft 16 are coaxially arranged, and the limited slip differential assembly 100 is located between the main motor 2 and the auxiliary motor 15. The first half shaft 1 and the second half shaft 16 are respectively used to connect to two wheels, and the main motor 2 and the auxiliary motor 15 are located between the two wheels.

[0030] When the vehicle is running normally, only the main motor 2 works, and the main motor 2 provides driving force. When the vehicle is climbing or accelerating, the main motor 2 and the auxiliary motor 15 work at the same time, the first clutch 18 is in a coupled state, and the main motor 2 and the auxiliary motor 15 provide driving force. When the vehicle is running at high speed, the auxiliary motor 15 works, and the first clutch 18 is in a coupled state, which can maximize the operation of the drive motor in a high efficiency range and increase the battery life.

[0031] like Figures 1 to 7As shown, the limited slip differential assembly 100 includes a sun gear 14, a planet carrier 11, a differential ring gear 9, an inner planetary gear 13 meshing with the sun gear 14, an outer planetary gear 12 meshing with the inner planetary gear 13, and a differential ring gear 9 meshing with the outer planetary gear 12, the inner planetary gear 13 and the outer planetary gear 12 are rotatably arranged on the planet carrier 11, the sun gear 14 is coaxially fixedly connected to the first half shaft 1, the planet carrier 11 is coaxially fixedly connected to the second half shaft 16, and the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the differential ring gear 9. Multiple inner planetary gears 13 and outer planetary gears 12 are provided, and the axes of the inner planetary gears 13 and the outer planetary gears 12 are parallel to the axes of the sun gear 14 and the axes of the first semi-shaft 1 and the second semi-shaft 16. All inner planetary gears 13 are distributed around the sun gear 14, and the outer planetary gears 12 are located on the outside of the inner planetary gears 13. Each outer planetary gear 12 is distributed and meshed with an inner planetary gear 13. The differential gear ring 9 is an integrated structure, and the differential gear ring 9 includes an inner gear ring and an outer gear ring. The outer gear ring is located on the outside of the inner gear ring, and the outer planetary gears 12 are located on the inside of the inner gear ring, and the outer planetary gears 12 are meshed with the inner gear ring.

[0032] like Figures 1 to 7 As shown, the first gear transmission mechanism includes a first gear driving gear 6, which is arranged on the intermediate shaft 4, and the first gear transmission mechanism is meshed with the differential gear ring 9. The second gear transmission mechanism includes a second gear driving gear 8 and a second gear driven gear 10 which are meshed with each other, the second gear driving gear 8 is arranged on the intermediate shaft 4, and the second gear transmission mechanism is connected with the differential gear ring 9.

[0033] like Figures 1 to 7 As shown, the synchronizer 7 is located between the first gear driving gear 6 and the second gear driving gear 8, the first gear driving gear 6 and the second gear driving gear 8 are loosely sleeved on the intermediate shaft 4, the first gear driving gear 6 is meshed with the outer gear ring of the differential gear ring 9, and the second gear driven gear 10 is coaxially fixedly connected with the differential gear ring 9. When the synchronizer 7 is combined with the first gear driving gear 6, the intermediate shaft 4 drives the first gear driving gear 6 to rotate through the synchronizer 7, and the first gear driving gear 6 transmits power to the limited slip differential assembly 100, and the multi-speed electric drive axle transmission device is in the first gear state; when the synchronizer 7 is combined with the second gear driving gear 8, the intermediate shaft 4 drives the second gear driving gear 8 to rotate through the synchronizer 7, and the second gear driven gear 10 transmits power to the limited slip differential assembly 100, and the multi-speed electric drive axle transmission device is in the second gear state.

[0034] like Figures 1 to 7As shown, the limited slip differential assembly 100 also includes a second clutch 17 connected to the first half shaft 1 and the second half shaft 16, and the second clutch 17 is a dog clutch (also known as a dog clutch or a dog clutch). The working principle of the dog clutch is to achieve power transmission and disconnection between the first half shaft 1 and the second half shaft 16 through the engagement and separation of the dog teeth. When the dog clutch is in an engaged state, the first half shaft 1 and the second half shaft 16 are tightly connected through the dog teeth, and power can be transmitted between the first half shaft 1 and the second half shaft 16, and the first half shaft 1 and the second half shaft 16 can rotate synchronously. When the dog clutch is in a disengaged state, the first half shaft 1 and the second half shaft 16 are separated, and the first half shaft 1 and the second half shaft 16 can no longer rotate synchronously. The structure of the dog clutch is relatively simple and the manufacturing cost is low. The dog clutch has good durability, is suitable for high-load and high-speed working environments, and has a long service life. The engagement between the dog teeth can provide a stable connection, thereby ensuring the effective transmission of power.

[0035] like Figures 1 to 7 As shown, the limited slip differential assembly 100 also includes a first support frame 21 and a second support frame 20 connected to the differential gear ring 9, the first half shaft 1 passes through the first support frame 21, the second half shaft 16 passes through the second support frame 20, and the first clutch 18 is configured to control the combination and separation between the auxiliary motor 15 and the second support frame 20. The first support frame 21 and the second support frame 20 are arranged relative to each other, the first support frame 21 and the second support frame 20 are connected to the differential gear ring 9, and the three rotate synchronously. The differential gear ring 9, the second clutch 17, the sun gear 14, and the planet carrier 11 are coaxially arranged, and the two ends of the first support frame 21 and the second support frame 20 are supported by bearings respectively. The second clutch 17 is combined or separated to control the second half shaft 18 to be rigidly connected to the first half shaft 1 and the sun gear 14 to be rigidly connected to the planet carrier 11, thereby realizing the limited slip function of the differential. When the differential gear ring 9 rotates, the sun gear 14 and the planet carrier 11 are driven to rotate through the outer planetary gear 12 and the inner planetary gear 13 to realize power transmission. The first clutch 18 is located between the second support frame 20 and the auxiliary motor 15 , and is used to control the connection and separation between the second support frame 20 and the output end of the auxiliary motor 15 .

[0036] like Figures 1 to 7 As shown, in the embodiment of the present invention, the power transmission mechanism is a gear transmission mechanism. The power transmission mechanism includes a first gear 3 and a second gear 5 that are meshed with each other, the first gear 3 is coaxially fixedly connected to the main input shaft, the second gear 5 is coaxially fixedly connected to the intermediate shaft 4, the first gear 3 is located between the main motor 2 and the limited slip differential assembly 100, the power transmission mechanism plays a deceleration role, and the diameter of the first gear 3 is smaller than the diameter of the second gear 5.

[0037] In the embodiment of the present invention, a three-speed shifting function is achieved by providing a double-row planetary gear mechanism and a primary reduction mechanism.

[0038] In the embodiment of the present invention, the main motor 2 is combined with the auxiliary motor 15 to provide stronger power, expand the high-efficiency range of the motor, increase the battery life, and achieve a perfect combination of power and economy.

[0039] In the embodiment of the present invention, when the gear is switched, the auxiliary motor 15 immediately participates in the power transmission, so that there is no power interruption when shifting gears.

[0040] In the embodiment of the present invention, the limited slip differential structure adopts a double planetary gear mechanism, which not only has the advantages of a common limited slip differential but also requires a smaller axial space.

[0041] In the embodiment of the present invention, the reverse gear can be achieved by reversing the motor, and the structural arrangement is more compact.

[0042] In the embodiment of the present invention, Figures 1 to 7 As shown, a parking mechanism 19 is integrated into the transmission device. The parking mechanism 19 is installed on the intermediate shaft 4. In the parking state, the synchronizer is combined with the 1st gear. The parking mechanism 19 is used to lock the intermediate shaft 4 when the vehicle is parked to prevent the intermediate shaft 4 from rotating, which can effectively ensure the safe parking of the vehicle in a stationary state.

[0043] Table 1 - Power control strategy

[0044] 1 / 2 gear synchronizer First clutch C1 Second clutch C2 Remark 1st gear √ (Optional) (Optional) 2nd gear √ (Optional) (Optional) 3rd gear × √ (Optional) R √ × (Optional) Main motor reverse Parking √ × ×

[0045] As shown in Table 1 and Figure 2 As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the first gear, the synchronizer 7 is combined with the first gear driving gear 6, and the first clutch 18 is in a disengaged state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the first gear driving gear 6 and the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to achieve power transmission.

[0046] As shown in Table 1 and Figure 2As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the first gear, the synchronizer 7 is combined with the first gear driving gear 6, and the first clutch 18 is in the engaged state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the first gear driving gear 6 and the limited slip differential assembly 100, and the power generated by the auxiliary motor 15 is directly transmitted to the first half shaft 1 and the second half shaft 16 through the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to achieve power transmission.

[0047] As shown in Table 1 and Figure 3 As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the second gear, the synchronizer 7 is combined with the second gear driving gear 8, and the first clutch 18 is in a disengaged state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the first gear driving gear 6, the second gear driven gear 10 and the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to realize power transmission.

[0048] As shown in Table 1 and Figure 3 As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the second gear, the synchronizer 7 is combined with the second gear driving gear 8, and the first clutch 18 is in the engaged state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the second gear driving gear 8, the second gear driven gear 10 and the limited slip differential assembly 100, and the power generated by the auxiliary motor 15 is directly transmitted to the first half shaft 1 and the second half shaft 16 through the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to achieve power transmission.

[0049] As shown in Table 1 and Figure 4 As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the third gear, the synchronizer 7 is in the middle position, the synchronizer 7 is not combined with the first gear driving gear 6 and the second gear driving gear 8, the first clutch 18 is in the combined state, and the power generated by the auxiliary motor 15 is directly transmitted to the first half shaft 1 and the second half shaft 16 through the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to achieve power transmission.

[0050] As shown in Table 1 and Figure 5As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in reverse gear, the synchronizer 7 is combined with the first gear driving gear 6, and the first clutch 18 is in a disengaged state, the main motor 2 is reversed, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the first gear driving gear 6 and the limited slip differential assembly 100, so that the two wheels rotate. In this process, the differential ring gear 9 rotates, and the differential ring gear 9 drives the sun gear 14 and the planet carrier 11 to rotate synchronously through the outer planetary gear 12 and the inner planetary gear 13 to achieve power transmission.

[0051] like Figure 6 As shown, when the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the first gear, the synchronizer 7 is combined with the first gear driving gear 6, and the first clutch 18 is in a disengaged state, and the second clutch 17 is in a coupled state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the first gear driving gear 6 and the limited slip differential assembly 100, so that the two wheels rotate. At this time, the first half shaft 1 and the second half shaft 16 are connected as a whole, the sun gear 14 and the planetary carrier 11 are connected as a whole, and the limited slip differential assembly 100 is output as a whole, thereby realizing the limited slip function.

[0052] When the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the second gear, the synchronizer 7 is combined with the second gear driving gear 8, and the first clutch 18 is in a disengaged state, and the second clutch 17 is in a coupled state, and the power generated by the main motor 2 is sequentially transmitted to the first half shaft 1 and the second half shaft 16 through the power transmission mechanism, the second gear driving gear 8, the second gear driven gear 10 and the limited slip differential assembly 100, so that the two wheels rotate. At this time, the first half shaft 1 and the second half shaft 16 are connected as a whole, the sun gear 14 and the planetary carrier 11 are connected as a whole, and the limited slip differential assembly 100 is output as a whole, thereby realizing the limited slip function.

[0053] When the multi-speed electric drive axle transmission device of the embodiment of the present invention is in the third gear, the synchronizer 7 is in the middle position, the synchronizer 7 is not combined with the first gear driving gear 6 and the second gear driving gear 8, the first clutch 18 is in the combined state, the second clutch 17 is in the combined state, and the auxiliary motor 15 is directly transmitted to the first half shaft 1 and the second half shaft 16 through the limited slip differential assembly 100, so that the two wheels rotate. At this time, the first half shaft 1 and the second half shaft 16 are connected as a whole, the sun gear 14 and the planetary carrier 11 are connected as a whole, and the limited slip differential assembly 100 is output as a whole, thereby realizing the limited slip function.

[0054] When the multi-speed electric drive axle transmission device of the embodiment of the present invention is in parking state, the synchronizer 7 is engaged with the first gear driving gear 6, and the first clutch 18 and the second clutch 17 are in a disengaged state. At this time, the wheel force is transmitted from the first half shaft 1 and the second half shaft 16 to the limited slip differential assembly 100, the first gear driving gear 6, the intermediate shaft 4 and the parking mechanism 19 in sequence, thereby achieving safe parking.

[0055] The multi-speed electric drive axle transmission device of the embodiment of the present invention has the following advantages:

[0056] 1. The present invention adopts a dual-motor offset coaxial structure, which provides strong power while minimizing the offset between the overall center of gravity and the output shaft, effectively reducing the polarization and NVH problems caused by cantilever support;

[0057] 2. The present invention combines the main motor 2 with the auxiliary motor 15. The first and second gears adopt the traditional synchronizer shifting structure. During the switching process between the first and second gears, the auxiliary motor 15 works and the first clutch is in a coupled state to ensure that there is no power interruption during the switching. In the third gear, the auxiliary motor 15 directly drives the differential device mode. During normal driving, the main motor 2 works. When climbing a slope or accelerating, the two motors work at the same time. At high speed, the auxiliary motor 15 works, which can maximize the guarantee that the drive motor operates in a high-efficiency range and increase the battery life.

[0058] 3. The motor of the present invention is directly integrated with the input shaft gear, and the differential device uses a double-star planetary gear transmission structure, which has the advantages of compact structure, large transmission ratio, strong load-bearing capacity, etc.

[0059] 4. The differential ring gear is integrated with the second gear driven gear, and a double planetary gear and dog clutch are used. Under the premise of meeting the limited slip function, the required space is smaller and the structure is more compact;

[0060] 5. The present invention integrates the parking mechanism 19 on the intermediate shaft 4, which effectively ensures the safe parking of the vehicle in a stationary state;

[0061] 6. In the present invention, the speed difference between the left and right wheels can be limited at any time through the dog clutch, solving the problem of power transmission when one side of the wheel of the car slips.

[0062] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A multi-speed electric drive axle transmission device, characterized in that: The invention comprises a main motor, an auxiliary motor, a first half shaft, a second half shaft, a first clutch, a limited slip differential assembly connected to the first half shaft and the second half shaft, an intermediate shaft receiving power from the main motor, a first gear transmission mechanism, a second gear transmission mechanism and a synchronizer arranged on the intermediate shaft and selectively combined with the first gear transmission mechanism and the second gear transmission mechanism, wherein the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the limited slip differential assembly, and the first clutch is arranged to control the combination and separation between the auxiliary motor and the limited slip differential assembly.

2. The multi-speed electric drive axle transmission device according to claim 1, characterized in that: The limited slip differential assembly includes a sun gear, a planet carrier, a differential ring gear, an inner planetary gear meshing with the sun gear, an outer planetary gear meshing with the inner planetary gear, and a differential ring gear meshing with the outer planetary gear, the inner planetary gear and the outer planetary gear are arranged on the planet carrier, and the first gear transmission mechanism and the second gear transmission mechanism are arranged to transmit power to the differential ring gear.

3. The multi-speed electric drive axle transmission device according to claim 2, characterized in that: The first gear transmission mechanism comprises a first gear driving gear, which is arranged on the intermediate shaft, and the first gear transmission mechanism is meshed with the differential gear ring.

4. The multi-speed electric drive axle transmission device according to claim 3, characterized in that: The second-gear transmission mechanism comprises a meshing second-gear driving gear and a second-gear driven gear, the second-gear driving gear is arranged on the intermediate shaft, and the second-gear transmission mechanism is connected to the differential gear ring.

5. The multi-speed electric drive axle transmission device according to claim 4, characterized in that: The synchronizer is located between the first-gear driving gear and the second-gear driving gear.

6. The multi-speed electric drive axle transmission device according to any one of claims 2 to 5, characterized in that: The limited slip differential assembly also includes a second clutch connected to the first half shaft and the second half shaft.

7. The multi-speed electric drive axle transmission device according to claim 6, characterized in that: The second clutch is a dog clutch.

8. The multi-speed electric drive axle transmission device according to any one of claims 2 to 7, characterized in that: The limited slip differential assembly also includes a first support frame and a second support frame connected to the differential ring gear, the first half shaft passes through the first support frame, the second half shaft passes through the second support frame, and the first clutch is configured to control the engagement and separation between the auxiliary motor and the second support frame.

9. The multi-speed electric drive axle transmission device according to any one of claims 1 to 8, characterized in that: The main motor is connected to the main input shaft, and the main input shaft is connected to the intermediate shaft through a power transmission mechanism.

10. The multi-speed electric drive axle transmission device according to claim 9, characterized in that: The power transmission mechanism is a gear transmission mechanism.

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