Coaxial type three-gear sequence shifting commercial vehicle electric drive axle integrated with planet row differential speed reducer

Abstract

The invention relates to the technical field of commercial vehicle electric drive axles, and discloses a coaxial three-gear sequence gear shifting commercial vehicle electric drive axle integrated with a planet row differential reducer, which comprises a motor, a gear shifting system assembly, a speed reduction planet row assembly, a differential reduction planet row assembly and a differential lock assembly, the differential reduction planet row assembly is connected with the speed reduction planet row assembly, the differential lock assembly is arranged on one side of the differential reduction planet row assembly, a left half shaft and a right half shaft are connected to the differential reduction planet row assembly, one end of the left half shaft is located on the outer side of the gear shifting system assembly, and one end of the right half shaft is located in the differential lock assembly. The gear shifting system assembly is connected with the motor and the speed reduction planet row assembly. The sequential gear shifting structure is used, only one gear shifting system is designed, the number and weight of parts are reduced, the assembly and after-sale fault risks are reduced, and through sequential gear shifting, the possibility that a mechanical structure is fool-proof and gear skipping does not occur is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of commercial vehicle electric drive axles, and in particular to a coaxial three-speed sequential shifting commercial vehicle electric drive axle with an integrated planetary differential reducer. Background Art

[0002] Currently, due to structural and technical limitations, commercial vehicle electric drive axles mostly use a complete parallel shaft deceleration solution or a parallel shaft + planetary gearbox deceleration solution, and match the conventional bevel gear differential to achieve the electric drive axle deceleration torque increase and wheel-end differential functions. This combination structure has the disadvantages of a very large overall size and heavy weight of the electric drive axle, which is very unfavorable for the layout and use of the vehicle. In addition, the powertrain center of mass will be offset from the power output center line of the electric drive axle, requiring a very complex shell structure to enhance the shell strength and make up for a series of disadvantages caused by the power center of mass offset.

[0003] Currently, the electric drive axle with three gears usually needs to design two sets of shift mechanisms, which include parts such as shift fork, gear hub, gear sleeve, and combination gear. Two sets of shift actuators are needed. The whole shift system is very complicated and has many parts. The overall structure is complicated. There are disadvantages such as large size, heavy weight, and large number of parts in the whole shift system. There are two sets of shift mechanisms for three gears. Usually, one set of gear hub and gear sleeve is used for 1st and 2nd gears, and one set of gear hub and gear sleeve is used for 3rd gear. When TCU control is inaccurate, there is a possibility of gear shifting in the gearbox.

[0004] At present, for electric drive axles with three gears, the shifting system is usually designed and arranged together with the reducer. The design and assembly layout of the entire shifting system are very difficult, and it is also very inconvenient to assemble the whole machine, troubleshoot and after-sales maintenance. When maintenance is required, it is usually necessary to open the entire electric drive axle gearbox body and remove the reducer gear shaft part to troubleshoot the shifting system fault. The maintenance project is huge and is very unfriendly to the after-sales market.

[0005] At present, the differentials on electric drive axles all adopt a bevel gear differential structure. The entire system only plays a simple role in realizing wheel-end differential. Not only is the overall function single, but the entire differential system is very complex, with a large number of parts, a complex overall structure, a large overall size, and a heavy weight. At present, the differential lock usually adopts a pneumatic dog tooth meshing structure. The whole set of differential lock structures includes an air intake nozzle, a cylinder, a shift fork, a sealing ring, a wear-resistant ring, a meshing sleeve, a return spring, a differential lock signal sensor and other parts. The meshing sleeve is driven by the cylinder, or the cylinder acts on the shift fork to drive the meshing sleeve to lock one side of the half shaft and the differential housing to achieve the purpose of the left and right half shafts being at the same speed. The whole set of differential lock systems is complex, with a large number of parts, a complex overall structure, cumbersome assembly, and a heavy weight. In addition, the whole vehicle needs to arrange an air path for the differential lock air intake nozzle, which increases the design requirements of the OEM and also increases the air control valves, joints, pipelines and other components of the whole vehicle. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the existing three-gear electric drive axle has a complex structure, a large weight, and is inconvenient to assemble and maintain.

[0007] In order to solve the above technical problems, the technical solution of the present invention is to provide a coaxial three-speed sequential shift commercial vehicle electric drive axle with an integrated planetary gearbox, including a motor, a gearshift system assembly, a reduction planetary gearbox assembly, a differential reduction planetary gearbox assembly, a differential lock assembly and an external housing. The motor, the gearshift system assembly, the reduction planetary gearbox assembly, the differential reduction planetary gearbox assembly and the differential lock assembly are all arranged in the external housing. The motor includes a hollow rotor shaft of the motor. The reduction planetary gearbox assembly is located on the right side of the motor and is connected to the hollow rotor shaft of the motor. The differential reduction planetary gear assembly is located on the right side of the reduction planetary gear assembly and is connected to the reduction planetary gear assembly. The differential lock assembly is arranged on the side of the differential reduction planetary gear assembly that is not connected to the reduction planetary gear assembly. A left half shaft and a right half shaft are connected to the differential reduction planetary gear assembly. One end of the left half shaft passes through the hollow rotor shaft of the motor and is located outside the gear shifting system assembly. One end of the right half shaft is located in the differential lock assembly. The gear shifting system assembly is located on the left side of the motor, and the gear shifting system assembly is connected to the hollow rotor shaft of the motor and the reduction planetary gear assembly.

[0008] Optionally, the reduction planetary row assembly includes a first reduction planetary row and a second reduction planetary row, the first reduction planetary row including a first reduction planetary row sun gear, a first reduction planetary row planetary gear, a first reduction planetary row outer ring gear and a first reduction planetary row planetary carrier, the second reduction planetary row including a second reduction planetary row outer ring gear, a second reduction planetary row planetary gear, a second reduction planetary row sun gear and a second reduction planetary row planetary carrier, the first reduction planetary row sun gear is connected to the hollow rotor shaft of the motor, the first reduction planetary row planetary gear is mounted on the first reduction planetary row planetary carrier and meshed with the first reduction planetary row sun gear and the first reduction planetary row outer ring gear, the second reduction planetary row outer ring gear is connected to the first reduction planetary row planetary carrier, the second reduction planetary row planetary gear is mounted on the second reduction planetary row planetary carrier and meshed with the second reduction planetary row outer ring gear and the second reduction planetary row sun gear.

[0009] Optionally, the sun gear of the first reduction planetary row is connected to the hollow rotor shaft of the motor via a spline, the planetary gear of the first reduction planetary row is connected to the planetary carrier of the first reduction planetary row via a pin shaft, the outer ring gear of the first reduction planetary row is fixed to the external housing via a spline, the planetary gear of the second reduction planetary row is installed on the planetary carrier of the second reduction planetary row via a pin shaft, and the outer ring gear of the second reduction planetary row is welded to the planetary carrier of the first reduction planetary row.

[0010] Optionally, the differential reduction planetary gear assembly includes a first differential reduction planetary gear and a second differential reduction planetary gear, the first differential reduction planetary gear includes a first differential reduction planetary gear sun gear, a first differential reduction planetary gear, a first differential reduction planetary gear outer ring gear and a first differential reduction planetary gear carrier, the second differential reduction planetary gear includes a second differential reduction planetary gear sun gear, a second differential reduction planetary gear, a second differential reduction planetary gear outer ring gear and a second differential reduction planetary gear carrier, the first differential reduction planetary gear is installed on the first differential reduction planetary gear carrier through a pin shaft, and is meshed with the first differential reduction planetary gear sun gear and the first differential reduction planetary gear outer ring gear, the second differential reduction planetary gear is installed on the second differential reduction planetary gear carrier through a pin shaft, and is meshed with the second differential reduction planetary gear sun gear and the second differential reduction planetary gear outer ring gear, the first differential reduction planetary gear outer ring gear is connected to the second differential reduction planetary gear sun gear, and the first differential reduction planetary gear is connected to the second reduction planetary gear carrier.

[0011] Optionally, the outer gear ring of the first differential planetary gear set is connected to the sun gear of the second differential planetary gear set via a spline, the planet carrier of the second differential planetary gear set is fixed to an external housing via bolts, the left half shaft is connected to the planet carrier of the first differential planetary gear set via a spline, and the right half shaft is connected to the outer gear ring of the second differential planetary gear set via a spline.

[0012] Optionally, the differential lock assembly includes a differential lock engagement sleeve and a differential lock solenoid valve, the differential lock solenoid valve is mounted on an external housing, and the differential lock engagement sleeve is disposed on an outer gear ring of the second differential planetary gearbox and connected to the differential lock solenoid valve.

[0013] Optionally, the shift system assembly includes a first gear shaft, a second gear shaft, a third gear shaft, a shift gear sleeve, a shift motor and a shift fork, the shift fork is connected between the shift gear sleeve and the shift motor, a shell bracket is provided in the external shell, the first gear shaft, the second gear shaft and the third gear shaft are all hollow structures and pass through the hollow rotor shaft of the motor, one end of the first gear shaft, the second gear shaft and the third gear shaft are provided with coupling teeth with inverted cone angles, the end of the shell bracket, the coupling teeth of the first gear shaft, the coupling teeth of the second gear shaft and the coupling teeth of the third gear shaft are all located in the shift gear sleeve, the other end of the third gear shaft is connected to the hollow rotor shaft of the motor, and the other ends of the first gear shaft and the second gear shaft are both connected to the reduction planetary gear assembly.

[0014] Optionally, the third gear shaft is connected to the hollow rotor shaft of the motor via a spline, the second gear shaft is connected to the outer gear ring of the second reduction planetary row via a spline, and the first gear shaft is connected to the sun gear of the second reduction planetary row via a spline.

[0015] In summary, the present invention has at least one of the following beneficial effects:

[0016] 1. The present invention realizes a 3-speed coaxial electric drive axle solution by using a hollow shaft motor + two-row reduction planetary gear assembly + integrated differential and reduction planetary gear assembly + electronic differential lock + sequential shifting system, and realizes the functions of electric drive axle deceleration and torque increase, wheel-end differential, electronic shifting, and escape locking. The overall structural size is very small, especially the longitudinal and vertical dimensions are particularly small, which is very advantageous for heavy trucks matching air suspension and composite suspension, and greatly improves the ground clearance and departure angle of the whole vehicle, which is very convenient for the installation and matching of the whole vehicle, and solves the shortcomings of large overall size and heavy weight of commercial vehicle electric drive axles. By adopting a hollow rotor shaft motor, the power output half shaft can pass through the motor rotor shaft, so that the center of mass of the electric drive axle is completely on the power output shaft, which solves a series of disadvantages such as weak shell strength and poor system NVH caused by center of mass offset.

[0017] 2. The present invention uses a sequential shifting structure and cleverly designs the first-gear, second-gear, and third-gear gear hubs together. Only one set of shifting system is designed, which reduces the number and weight of parts, reduces assembly, and reduces the risk of after-sales failure. In addition, the sequential shifting has a fool-proof mechanical structure and will not cause gear skipping.

[0018] 3. The present invention arranges the coupling teeth on the shift shaft on the left side of the motor through structural design and utilizing the unique structure of the hollow rotor shaft motor, and then arranges the entire shift system on the left side of the motor, thereby solving the difficulties in shift system design and assembly design and layout, and complete machine assembly. When a fault occurs in the shift system, only the left shift system part and the corresponding housing need to be disassembled, without disassembling the entire electric drive axle assembly, thereby solving a series of problems caused by integration, such as fault detection and after-sales maintenance.

[0019] 4. The present invention designs a novel planetary gear structure integrating a reducer and a differential, and realizes the function of reducing speed and increasing torque as well as the function of a differential through the combination of two planetary gears. Two functions are realized through one structure, and the structure has the advantages of simple structure, small overall size, and light weight.

[0020] 5. This patent uses a solenoid valve and a meshing sleeve to form an electronic differential lock system. When the solenoid valve is powered on, the electromagnet pushes the meshing sleeve to move through the principle of repulsion between the same and directly locks the left and right half-axles to achieve the wheel-end differential locking function. The entire differential lock system is simple, with a small number of parts, simple assembly, and light weight. Only a power plug-in and sensor wiring harness need to be arranged on the vehicle end, which is very convenient for matching with the vehicle application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the first gear power transmission of the present invention;

[0023] Figure 3 It is a schematic diagram of the second gear power transmission of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-speed power transmission of the present invention;

[0025] In the figure: 1, motor hollow rotor shaft; 2, motor; 3, first reduction planetary row sun gear; 4, first reduction planetary row planetary gear; 5, first reduction planetary row outer gear ring; 6, first reduction planetary row planet carrier; 7, second reduction planetary row outer gear ring; 8, second reduction planetary row planetary gear; 9, second reduction planetary row sun gear; 10, second reduction planetary row planet carrier; 11, first differential planetary row sun gear; 12, first differential planetary row planetary gear; 13, first differential planetary row outer gear ring; 14, first differential planetary row planetary gear; 1. The second differential planetary gear rack; 2. The second differential planetary gear rack; 3. The second differential planetary gear rack; 4. The second differential planetary gear rack; 5. The second differential planetary gear rack; 6. The second differential planetary gear rack; 7. The second differential planetary gear rack; 8. The second differential planetary gear rack; 9. The second gear shaft; 10. The first gear shaft; 11. The third gear shaft; 12. The housing bracket; 13. The shift gear sleeve; 14. The shift motor; 15. The shift fork; 16. The left half shaft; 17. The right half shaft; 18. The differential lock engagement sleeve; 19. The differential lock solenoid valve; 20. The shift system assembly; 21. The reduction planetary gear assembly; 22. The differential planetary gear assembly; 23. The second differential planetary gear rack; 24. The first gear shaft; 25. The third gear shaft; 26. The second differential planetary gear rack; 27. The second differential planetary gear rack; 28. The differential lock solenoid valve; 30. The shift system assembly; 31. The reduction planetary gear assembly; 32. The differential planetary gear assembly. DETAILED DESCRIPTION

[0026] The following combination Figure 1-4 The present invention is described in further detail.

[0027] The present invention discloses a coaxial three-speed sequential shifting commercial vehicle electric drive axle with integrated planetary differential reducer, referring to Figure 1 , including motor 2, shift system assembly 30, reduction planetary gear assembly 31, differential reduction planetary gear assembly 32, differential lock assembly and external housing. Motor 2, shift system assembly 30, reduction planetary gear assembly 31, differential reduction planetary gear assembly 32 and differential lock assembly are all arranged in the external housing. It can be equipped with sanitation vehicles, logistics trucks, tractors, buses for tourism and other vehicles used in different scenarios, and has strong adaptability. Among them,

[0028] The motor 2 includes a hollow rotor shaft 1 of the motor, a reduction planetary gear assembly 31 is located on the right side of the motor 2 and is connected to the hollow rotor shaft 1 of the motor, a differential reduction planetary gear assembly 32 is located on the right side of the reduction planetary gear assembly 31 and is connected to the reduction planetary gear assembly 31, a differential lock assembly is arranged on the side of the differential reduction planetary gear assembly 32 which is not connected to the reduction planetary gear assembly 31, a left half shaft 26 and a right half shaft 27 are connected to the differential reduction planetary gear assembly 32, one end of the left half shaft 26 passes through the hollow rotor shaft 1 of the motor and is located outside the shift system assembly 30, one end of the right half shaft 27 is located in the speed lock assembly, the shift system assembly 30 is located on the left side of the motor 2, and the shift system assembly 30 is connected to the hollow rotor shaft 1 of the motor and the reduction planetary gear assembly 31.

[0029] In a further embodiment, the reduction planetary row assembly 31 includes a first reduction planetary row and a second reduction planetary row, the first reduction planetary row includes a first reduction planetary row sun gear 3, a first reduction planetary row planetary gear 4, a first reduction planetary row outer gear ring 5 and a first reduction planetary row planet carrier 6, the second reduction planetary row includes a second reduction planetary row outer gear ring 7, a second reduction planetary row planetary gear 8, a second reduction planetary row sun gear 9 and a second reduction planetary row planet carrier 10, the first reduction planetary row sun gear 3 is connected to the hollow rotor shaft 1 of the motor by a spline, the first reduction planetary row planetary gear 4 is installed on the first reduction planetary row planet carrier 6 by a pin shaft, and is meshed with the first reduction planetary row sun gear 3 and the first reduction planetary row outer gear ring 5 for transmitting power, the first reduction planetary row outer gear ring 5 is fixed to the external housing by a spline, the second reduction planetary row outer gear ring 7 is connected to the first reduction planetary row planet carrier 6 by laser welding, the second reduction planetary row planetary gear 8 is installed on the second reduction planetary row planet carrier 10 by a pin shaft, and is meshed with the second reduction planetary row outer gear ring 7 and the second reduction planetary row sun gear 9 for transmitting power.

[0030] In a further embodiment, the differential planetary gear assembly 32 includes a first differential planetary gear and a second differential planetary gear, the first differential planetary gear includes a first differential planetary gear sun gear 11, a first differential planetary gear 12, a first differential planetary gear outer ring gear 13 and a first differential planetary gear carrier 14, the second differential planetary gear includes a second differential planetary gear sun gear 15, a second differential planetary gear 16, a second differential planetary gear outer ring gear 17 and a second differential planetary gear carrier 18, the first differential planetary gear 12 is installed on the first differential planetary gear carrier 14 through a pin shaft, and is connected to the first differential planetary gear sun gear 11 and the first differential planetary gear outer ring gear 17. The ring 13 is meshed and connected to transmit power, the second differential planetary gear 16 is installed on the second differential planetary gear carrier 18 through a pin shaft, and is meshed and connected with the second differential planetary gear sun gear 15 and the second differential planetary gear outer ring 17 to transmit power, the first differential planetary gear outer ring 13 is connected to the second differential planetary gear sun gear 15 through a spline, the first differential planetary gear sun gear 11 is connected to the second reduction planetary gear carrier 10, the second differential planetary gear carrier 18 is fixed to the external housing by bolts, the left half shaft 26 is connected to the first differential planetary gear carrier 14 through a spline, and the right half shaft 27 is connected to the second differential planetary gear outer ring 17 through a spline.

[0031] In a further embodiment, the differential lock assembly includes a differential lock engagement sleeve 28 and a differential lock solenoid valve 29. The differential lock solenoid valve 29 is installed on an external housing. The differential lock engagement sleeve 28 is arranged on the outer gear ring 17 of the second differential planetary gear and is connected to the differential lock solenoid valve 29. When the differential lock solenoid valve 29 is energized, the principle of like repels like is used to push the differential lock engagement sleeve 28 to move, directly locking the left and right half shafts, making the left and right wheel ends move at the same speed, thereby achieving the function of getting out of trouble.

[0032] In a further embodiment, the shift system assembly 30 includes a first gear shaft 20, a second gear shaft 19, a third gear shaft 21, a shift gear sleeve 23, a shift motor 24 and a shift fork 25, the shift fork 25 is connected between the shift gear sleeve 23 and the shift motor 24, a housing bracket 22 is provided in the external housing, the first gear shaft 20, the second gear shaft 19 and the third gear shaft 21 are all hollow structures and pass through the hollow rotor shaft 1 of the motor, one end of the first gear shaft 20, the second gear shaft 19 and the third gear shaft 21 is provided with a coupling tooth with an inverted cone angle, and the housing bracket 22 is provided with a housing bracket 22. The end of the body bracket 22, the coupling teeth of the first gear shaft 20, the coupling teeth of the second gear shaft 19 and the coupling teeth of the third gear shaft 21 are all located in the shift gear sleeve 23. The other end of the third gear shaft 21 is connected to the hollow rotor shaft 1 of the motor. The other ends of the first gear shaft 20 and the second gear shaft 19 are connected to the reduction planetary gear assembly 31. The third gear shaft 21 is connected to the hollow rotor shaft 1 of the motor through a spline. The second gear shaft 19 is connected to the second reduction planetary gear ring 7 through a spline. The first gear shaft 20 is connected to the second reduction planetary gear sun gear 9 through a spline.

[0033] When the electric drive bridge of the present invention is working, under the first gear working condition, refer to Figure 2 , the shift motor 24 drives the shift fork 25 and then drives the shift gear sleeve 23 to move to the left. At this time, the first gear shaft 20 is connected to the housing bracket 22 through the shift gear sleeve 23. Because the first gear shaft 20 is connected to the second reduction planetary row sun gear 9 through a spline, the second reduction planetary row sun gear 9 is fixed and has no speed. The power flow is through the motor hollow rotor 1→the first reduction planetary row sun gear 3→the first reduction planetary row planet carrier 6→the second reduction planetary row outer gear ring 7→the second reduction planetary row planet carrier 10→the first differential reduction planetary row sun gear 11. After the first differential reduction planetary row sun gear 11, the power is divided into the left and right ends, wherein the power flow at the left end is: the first differential reduction planetary row sun gear 11→the first differential reduction planetary row planet carrier 14→the left half shaft 26, and the power flow at the right end is: the first differential reduction planetary row sun gear 11→the first differential reduction planetary row outer gear ring 13→the second differential reduction planetary row sun gear 15→the second differential reduction planetary row outer gear ring 17→the right half shaft 27;

[0034] In the second gear, Figure 3 As shown, the shift motor 24 drives the shift fork 25 and then drives the shift gear sleeve 23 to remain in the middle position. At this time, the first gear shaft 20 is connected to the second gear shaft 19 through the shift gear sleeve 23. At this time, the second reduction planetary row outer gear ring 7 is connected to the second reduction planetary row sun gear 9. The various parts of the second reduction planetary row have no relative speed. At this time, the speed ratio is 1, and the power flow is through the motor hollow rotor 1→the first reduction planetary row sun gear 3→the first reduction planetary row planet carrier 6→the second reduction planetary row. After the second reduction planetary row, the power is divided into the left and right ends, wherein the left end power flow is: the first differential reduction planetary row sun gear 11→the first differential reduction planetary row planet carrier 14→the left half shaft 26, and the right end power flow is: the first differential reduction planetary row sun gear 11→the first differential reduction planetary row outer gear ring 13→the second differential reduction planetary row sun gear 15→the second differential reduction planetary row outer gear ring 17→the right half shaft 27;

[0035] Under the third gear working condition, refer to Figure 4, the shift motor 24 drives the shift fork 25 and then drives the shift gear sleeve 23 to move to the right. At this time, the first gear shaft 20 is connected to the third gear shaft 21 through the shift gear sleeve 23, and the power is compounded in the reduction planetary gear assembly 31. The power flows into the second reduction planetary gear carrier 10 in parallel. One power flow is the motor hollow rotor 1→the first reduction planetary gear sun gear 3→the first reduction planetary gear carrier 6→the second reduction planetary gear outer ring 7→the second reduction planetary gear carrier 10; the other power flow is the motor hollow rotor 1→the second reduction planetary gear sun gear 9→ The two powers of the second reduction planetary gear carrier 10 merge into the row and flow from the second reduction planetary gear carrier 10 into the first differential planetary gear sun gear 11. After flowing through the first differential planetary gear sun gear 11, the power is divided into the left and right ends, wherein the power flow at the left end is: first differential planetary gear sun gear 11 → first differential planetary gear carrier 14 → left half shaft 26, and the power flow at the right end is: first differential planetary gear 11 → first differential planetary gear outer ring 13 → second differential planetary gear sun gear 15 → first differential planetary gear outer ring 17 → right half shaft 27.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer, characterized in that: The invention comprises a motor (2), a gear shifting system assembly (30), a speed reducing planetary gear assembly (31), a differential reduction planetary gear assembly (32), a differential lock assembly and an external housing, wherein the motor (2), the gear shifting system assembly (30), the speed reducing planetary gear assembly (31), the differential reduction planetary gear assembly (32) and the differential lock assembly are all arranged in the external housing, the motor (2) comprises a motor hollow rotor shaft (1), the speed reducing planetary gear assembly (31) is located on the right side of the motor (2) and is connected to the motor hollow rotor shaft (1), the differential reduction planetary gear assembly (32) is located on the right side of the speed reducing planetary gear assembly (31) and is connected to the speed reducing planetary gear assembly (32). The gear shift system assembly (30) is connected to the motor (2), the differential lock assembly is arranged on the side of the differential reduction planetary gear assembly (32) that is not connected to the reduction planetary gear assembly (31), the differential reduction planetary gear assembly (32) is connected to a left half shaft (26) and a right half shaft (27), one end of the left half shaft (26) passes through the hollow rotor shaft (1) of the motor and is located outside the gear shift system assembly (30), one end of the right half shaft (27) is located in the differential lock assembly, the gear shift system assembly (30) is located on the left side of the motor (2), and the gear shift system assembly (30) is connected to the hollow rotor shaft (1) of the motor and the reduction planetary gear assembly (31).

2. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 1, characterized in that: The reduction planetary gear assembly (31) comprises a first reduction planetary gear and a second reduction planetary gear. The first reduction planetary gear comprises a first reduction planetary gear sun gear (3), a first reduction planetary gear (4), a first reduction planetary gear outer ring gear (5) and a first reduction planetary gear carrier (6). The second reduction planetary gear comprises a second reduction planetary gear outer ring gear (7), a second reduction planetary gear (8), a second reduction planetary gear sun gear (9) and a second reduction planetary gear carrier (10). The first reduction planetary gear sun gear (3) is connected to the hollow rotor shaft (1) of the motor. The first reduction planetary gear (4) is mounted on the first reduction planetary gear carrier (6) and meshed with the first reduction planetary gear sun gear (3) and the first reduction planetary gear outer ring gear (5). The second reduction planetary gear outer ring gear (7) is connected to the first reduction planetary gear carrier (6). The second reduction planetary gear (8) is mounted on the second reduction planetary gear carrier (10) and meshed with the second reduction planetary gear outer ring gear (7) and the second reduction planetary gear sun gear (9).

3. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 2, characterized in that: The first reduction planetary gear sun gear (3) is connected to the hollow rotor shaft (1) of the motor via a spline, the first reduction planetary gear (4) is connected to the first reduction planetary gear carrier (6) via a pin shaft, the first reduction planetary gear outer ring (5) is fixed to the external housing via a spline, the second reduction planetary gear (8) is mounted on the second reduction planetary gear carrier (10) via a pin shaft, and the second reduction planetary gear outer ring (7) is welded to the first reduction planetary gear carrier (6).

4. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 2, characterized in that: The differential planetary gear assembly (32) comprises a first differential planetary gear and a second differential planetary gear, wherein the first differential planetary gear comprises a first differential planetary gear sun gear (11), a first differential planetary gear (12), a first differential planetary gear outer ring gear (13) and a first differential planetary gear carrier (14), and the second differential planetary gear comprises a second differential planetary gear sun gear (15), a second differential planetary gear (16), a second differential planetary gear outer ring gear (17) and a second differential planetary gear carrier (18), wherein the first differential planetary gear (12) is mounted on the first differential planetary gear sun gear (11), a first differential planetary gear planetary gear (12), a first differential planetary gear outer ring gear (13) and a first differential planetary gear carrier (14), and the second differential planetary gear comprises a second differential planetary gear sun gear (15), a second differential planetary gear planetary gear (16), a second differential planetary gear outer ring gear (17) and a second differential planetary gear carrier (18). The first differential planetary gear (14) is mounted on the first differential planetary gear carrier (14) and meshed with the first differential planetary gear sun gear (11) and the first differential planetary gear outer ring gear (13); the second differential planetary gear (16) is mounted on the second differential planetary gear carrier (18) through a pin shaft and meshed with the second differential planetary gear sun gear (15) and the second differential planetary gear outer ring gear (17); the first differential planetary gear outer ring gear (13) is connected to the second differential planetary gear sun gear (15); and the first differential planetary gear sun gear (11) is connected to the second reduction planetary gear carrier (10).

5. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 4, characterized in that: The first differential planetary gear outer ring (13) is connected to the second differential planetary gear sun gear (15) via a spline, the second differential planetary gear carrier (18) is fixed to the external housing via bolts, the left half shaft (26) is connected to the first differential planetary gear carrier (14) via a spline, and the right half shaft (27) is connected to the second differential planetary gear outer ring (17) via a spline.

6. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 4, characterized in that: The differential lock assembly comprises a differential lock engagement sleeve (28) and a differential lock solenoid valve (29), wherein the differential lock solenoid valve (29) is mounted on an external housing, and the differential lock engagement sleeve (28) is arranged on the second differential planetary gear outer ring (17) and connected to the differential lock solenoid valve (29).

7. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 4, characterized in that: The shift system assembly (30) comprises a first gear shaft (20), a second gear shaft (19), a third gear shaft (21), a shift gear sleeve (23), a shift motor (24) and a shift fork (25), wherein the shift fork (25) is connected between the shift gear sleeve (23) and the shift motor (24), a housing bracket (22) is provided in the external housing, and the first gear shaft (20), the second gear shaft (19) and the third gear shaft (21) are all hollow structures and pass through the hollow rotor shaft (1) of the motor. One end of the first gear shaft (20), the second gear shaft (19) and the third gear shaft (21) is provided with a coupling tooth with an inverted cone angle; the end of the housing bracket (22), the coupling tooth of the first gear shaft (20), the coupling tooth of the second gear shaft (19) and the coupling tooth of the third gear shaft (21) are all located in the shift gear sleeve (23); the other end of the third gear shaft (21) is connected to the hollow rotor shaft (1) of the motor; and the other ends of the first gear shaft (20) and the second gear shaft (19) are both connected to the reduction planetary gear assembly (31).

8. The coaxial three-speed sequential shift commercial vehicle electric drive axle with integrated planetary differential reducer according to claim 7, characterized in that: The third gear shaft (21) is connected to the hollow rotor shaft (1) of the motor via a spline, the second gear shaft (19) is connected to the outer gear ring (7) of the second reduction planetary gear row via a spline, and the first gear shaft (20) is connected to the sun gear (9) of the second reduction planetary gear row via a spline.

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