A dual-motor two-speed electric tractor transmission system and tractor

Abstract

The invention provides a dual-motor two-speed electric tractor transmission system and a tractor. A dual-motor two-speed electric tractor transmission system, wherein a first drive motor and a second drive motor are both connected to a low-speed driving gear shaft, a low-speed driving gear is provided on the low-speed driving gear shaft, a high-speed driving gear is installed on the low-speed driving gear shaft, a high-speed passive gear, a gear hub, a low-speed passive gear, and a four-wheel drive input gear are all installed on a small cone output shaft; the high-speed passive gear is meshed with the high-speed driving gear, the low-speed passive gear is meshed with the low-speed driving gear on the low-speed driving gear shaft, and a meshing sleeve is slidably installed on the small cone output shaft; a four-wheel drive output and parking common gear is meshed with a four-wheel drive input gear, a wet four-wheel drive clutch assembly is connected to a four-wheel drive output and parking common gear, and a front axle is connected to a wet four-wheel drive clutch assembly; a differential assembly is connected to the small cone output shaft, and a left final drive and a right final drive are both transmission-connected to the differential assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor transmission systems, and in particular to a dual-motor two-speed electric tractor transmission system and a tractor. Background Art

[0002] As a new type of agricultural machinery, electric tractors have the advantages of low pollution, low noise, high efficiency, and convenient stepless speed change. They are of great significance in alleviating exhaust emission pollution and promoting agricultural intelligence.

[0003] The electric tractor transmission system in the prior art has a complex structure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a dual-motor two-speed electric tractor transmission system and a tractor in view of the deficiencies in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a dual-motor two-speed electric tractor transmission system, comprising: a first drive motor, a second drive motor, a low-speed driving gear shaft, a high-speed driving gear, a high-speed passive gear, a meshing sleeve, a gear hub, a low-speed passive gear, a small tapered output shaft, a four-wheel drive input gear, a four-wheel drive output and parking common gear, a wet four-wheel drive clutch assembly, a front axle, a differential assembly, a left final drive, and a right final drive. The first drive motor and the second drive motor are both connected to the low-speed driving gear shaft in a transmission manner. The low-speed driving gear shaft is provided with a low-speed driving gear, and the high-speed driving gear is installed on the low-speed driving gear shaft. The high-speed passive gear, the high-speed driving gear, the high-speed driving gear and the high-speed driving gear are connected to the low-speed driving gear shaft. The gear hub, the low-gear driven gear, and the four-wheel drive input gear are all installed on the small tapered output shaft; the high-gear driven gear is meshed with the high-gear driving gear, the low-gear driven gear is meshed with the low-gear driving gear on the low-gear driving gear shaft, and the engagement sleeve is slidably installed on the small tapered output shaft; the four-wheel drive output and parking common gear is meshed with the four-wheel drive input gear, the wet four-wheel drive clutch assembly is transmission-connected with the four-wheel drive output and parking common gear, and the front axle is transmission-connected with the wet four-wheel drive clutch assembly; the differential assembly is transmission-connected with the small tapered output shaft, and the left final drive and the right final drive are both transmission-connected with the differential assembly.

[0006] The beneficial effects of the technical solution of the present invention are as follows: the two-speed electric tractor transmission system has the advantage of stepless speed change, simplifies the complex transmission structure of the gearbox, and only needs to retain two gears to meet the requirements of the operating speed of various working conditions. The two-speed electric tractor transmission system is not only simplified in structure and low in cost, but also can replace the stepless CVT gearbox. The electric tractor can be operated in two sections, and the power confluence of the dual motors can provide more reliable power transmission for the transmission system. If one motor is damaged, the other motor can also work. The dual motor input ensures that the drive system is more reliable and can operate in an environment with requirements for noise and emissions.

[0007] Furthermore, the first drive motor and the second drive motor are both connected to a motor controller, and the motor controller is connected to a power battery.

[0008] The beneficial effect of adopting the above further technical solution is that the motor controller is used to control the drive motor, and the power battery is used to provide electrical energy.

[0009] Further, the motor controller is connected to a PTO motor, and the PTO motor is connected to a PTO.

[0010] The beneficial effect of adopting the above further technical solution is that the independent PTO drive system can improve the PTO operation efficiency.

[0011] Furthermore, the first drive motor and the second drive motor are respectively connected to input gear shafts, an output gear is installed on the low gear driving gear shaft, and the input gear shaft transmission-connected to the first drive motor and the input gear shaft transmission-connected to the second drive motor are both transmission-connected to the output gear.

[0012] The beneficial effect of adopting the above further technical solution is: achieving power confluence of dual motor inputs.

[0013] Furthermore, the input gear shaft that is transmission-connected to the first drive motor and the input gear shaft that is transmission-connected to the second drive motor are respectively transmission-connected to an intermediate gear shaft, and the intermediate gear shaft that is transmission-connected to the first drive motor and the intermediate gear shaft that is transmission-connected to the second drive motor are both transmission-connected to the output gear; the output gear is mounted on the low-gear driving gear shaft via a spline.

[0014] The beneficial effect of adopting the above further technical solution is: achieving power confluence of dual motor inputs.

[0015] Furthermore, gears are installed on both the input gear shaft and the intermediate gear shaft, the input gear shaft is transmission-connected to the intermediate gear shaft via the gears, and the gears on the intermediate gear shaft are meshed with the output gear.

[0016] The beneficial effect of adopting the above further technical solution is that when dual motors are input, the power input from the dual motors is merged through the mutual meshing of the mechanical gears, the gears on the input gear shaft, the gears on the intermediate gear shaft and the output gears. Gear transmission improves the stability and reliability of the system.

[0017] Furthermore, the high-gear driving gear is mounted on the low-gear driving gear shaft via a spline.

[0018] The beneficial effect of adopting the above further technical solution is that it is convenient for the low-speed driving gear shaft to drive the high-speed driving gear to rotate synchronously.

[0019] Furthermore, the four-wheel drive output and parking common gear is installed on the transmission shaft, the wet four-wheel drive clutch assembly is coaxially arranged with the four-wheel drive output and parking common gear, and the transmission shaft of the four-wheel drive output and parking common gear is connected with a normally closed parking mechanism.

[0020] The beneficial effect of adopting the above-mentioned further technical solution is that the normally closed parking mechanism is normally closed when not started, the normally closed parking mechanism locks the four-wheel drive output and parking common gear, the four-wheel drive input gear and the four-wheel drive output and parking common gear are meshed with each other, so that the small cone output shaft cannot rotate; after power is turned on, the pressure oil compresses the normally closed parking mechanism spring to release the parking.

[0021] Furthermore, the engagement sleeve is connected with an automatic gear shift control mechanism.

[0022] The beneficial effect of adopting the above further technical solution is that the automatic gear shift control mechanism can control the meshing sleeve to slide left and right on the gear hub to engage with the high gear or low gear passive gear to realize the automatic gear shift function.

[0023] In addition, the present invention also provides a tractor, comprising a dual-motor two-speed electric tractor transmission system as described in any one of the above.

[0024] The beneficial effects of the technical solution of the present invention are as follows: the two-speed electric tractor transmission system has the advantage of stepless speed change, simplifies the complex transmission structure of the gearbox, and only needs to retain two gears to meet the requirements of the operating speed of various working conditions. The two-speed electric tractor transmission system is not only simplified in structure and low in cost, but also can replace the stepless CVT gearbox. The electric tractor can be operated in two sections, and the power confluence of the dual motors can provide more reliable power transmission for the transmission system. If one motor is damaged, the other motor can also work. The dual motor input ensures that the drive system is more reliable and can operate in an environment with requirements for noise and emissions.

[0025] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the structural schematic diagrams of the dual-motor two-speed electric tractor transmission system provided by an embodiment of the present invention.

[0027] Figure 2 The second structural schematic diagram of the dual-motor two-speed electric tractor transmission system provided in an embodiment of the present invention.

[0028] Figure 3 The third structural schematic diagram of the dual-motor two-speed electric tractor transmission system provided by an embodiment of the present invention.

[0029] Figure 4 The fourth structural schematic diagram of the dual-motor two-speed electric tractor transmission system provided in an embodiment of the present invention.

[0030] Figure 5 The fifth structural schematic diagram of the dual-motor two-speed electric tractor transmission system provided in an embodiment of the present invention.

[0031] Figure 6 The sixth structural schematic diagram of the dual-motor two-speed electric tractor transmission system provided in an embodiment of the present invention.

[0032] Explanation of the accompanying drawings: 1. Power battery; 2. Motor controller; 3. First drive motor; 4. Second drive motor; 5. Input gear shaft; 6. Intermediate gear shaft; 7. Output gear; 8. Low gear driving gear shaft; 9. High gear driving gear; 10. High gear passive gear; 11. Engagement sleeve; 12. Gear hub; 13. Low gear passive gear; 14. Small tapered output shaft; 15. Four-wheel drive input gear; 16. Four-wheel drive output and parking common gear; 17. Wet four-wheel drive clutch assembly; 18. Normally closed parking mechanism; 19. Front axle; 20. Differential assembly; 21. Left final drive; 22. Right final drive; 23. PTO motor; 24. PTO. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0034] like Figures 1 to 6As shown, the embodiment of the present invention provides a dual-motor two-speed electric tractor transmission system, including: a first drive motor 3, a second drive motor 4, a low-speed driving gear shaft 8, a high-speed driving gear 9, a high-speed passive gear 10, a meshing sleeve 11, a gear hub 12, a low-speed passive gear 13, a small cone output shaft 14, a four-wheel drive input gear 15, a four-wheel drive output and parking common gear 16, a wet four-wheel drive clutch assembly 17, a front axle 19, a differential assembly 20, a left final drive 21, and a right final drive 22. The first drive motor 3 and the second drive motor 4 are both connected to the low-speed driving gear shaft 8 in transmission, and the low-speed driving gear shaft 8 is provided with a low-speed driving gear. The high-speed driving gear 9 is installed on the low-speed driving gear shaft 8. The high-speed passive gear 10, the gear hub 12 , the low-speed passive gear 13 and the four-wheel drive input gear 15 are all installed on the small tapered output shaft 14; the high-speed passive gear 10 is meshed with the high-speed driving gear 9, the low-speed passive gear 13 is meshed with the low-speed driving gear on the low-speed driving gear shaft 8, and the engagement sleeve 11 is slidably installed on the small tapered output shaft 14; the four-wheel drive output and parking common gear 16 is meshed with the four-wheel drive input gear 15, the wet four-wheel drive clutch assembly 17 is transmission-connected with the four-wheel drive output and parking common gear 16, and the front axle 19 is transmission-connected with the wet four-wheel drive clutch assembly 17; the differential assembly 20 is transmission-connected with the small tapered output shaft 14, and the left final drive 21 and the right final drive 22 are both transmission-connected with the differential assembly 20.

[0035] The beneficial effects of the technical solution of the present invention are as follows: the two-speed electric tractor transmission system has the advantage of stepless speed change, simplifies the complex transmission structure of the gearbox, and only needs to retain two gears to meet the requirements of the operating speed of various working conditions. The two-speed electric tractor transmission system is not only simplified in structure and low in cost, but also can replace the stepless CVT gearbox. The electric tractor can be operated in two sections, and the power confluence of the dual motors can provide more reliable power transmission for the transmission system. If one motor is damaged, the other motor can also work. The dual motor input ensures that the drive system is more reliable and can operate in an environment with requirements for noise and emissions.

[0036] As a zero-emission, low-noise power system, the two-speed electric tractor transmission system (dual-motor two-speed electric tractor transmission system) can be used in some operating environments that require low noise and low pollution.

[0037] The two-speed electric tractor transmission system has the advantage of continuously variable speed, which simplifies the complex transmission structure of the gearbox. Only two gears need to be retained to meet the speed requirements of various working conditions. The two-speed electric tractor transmission system is not only simple in structure and low in cost, but can also replace the continuously variable CVT gearbox.

[0038] The embodiment of the present invention provides a dual-motor two-speed electric tractor transmission system, which can be the transmission system of a two-speed electric tractor and can enable the electric tractor to operate in two sections. The power confluence of the dual motors can provide more reliable power transmission for the transmission system. If one motor is damaged, the other motor can also work; the independent PTO drive system can improve the PTO operation efficiency.

[0039] Figure 2 , Figure 3 , Figure 5 and Figure 6 The arrows in the figure represent the power transmission trajectory and the power transmission direction.

[0040] like Figures 1 to 6 As shown, further, the first drive motor 3 and the second drive motor 4 are both connected to a motor controller 2 , and the motor controller 2 is connected to a power battery 1 .

[0041] The beneficial effect of adopting the above further technical solution is that the motor controller is used to control the drive motor, and the power battery is used to provide electrical energy.

[0042] like Figures 1 to 6 As shown, further, the motor controller 2 is connected to a PTO motor 23 , and the PTO motor 23 is connected to a PTO 24 .

[0043] The beneficial effect of adopting the above further technical solution is that the independent PTO drive system can improve the PTO operation efficiency.

[0044] like Figures 1 to 6 As shown, further, the first drive motor 3 and the second drive motor 4 are respectively connected to the input gear shaft 5, and the output gear 7 is installed on the low gear driving gear shaft 8, and the input gear shaft 5 transmission-connected to the first drive motor 3 and the input gear shaft 5 transmission-connected to the second drive motor 4 are both transmission-connected to the output gear 7.

[0045] The beneficial effect of adopting the above further technical solution is: achieving power confluence of dual motor inputs.

[0046] like Figures 1 to 6 As shown, further, the input gear shaft 5 connected to the first drive motor 3 and the input gear shaft 5 connected to the second drive motor 4 are respectively connected to the intermediate gear shaft 6, and the intermediate gear shaft 6 connected to the first drive motor 3 and the intermediate gear shaft 6 connected to the second drive motor 4 are both connected to the output gear 7; the output gear 7 is mounted on the low-gear driving gear shaft 8 through a spline.

[0047] The beneficial effect of adopting the above further technical solution is: achieving power confluence of dual motor inputs.

[0048] like Figures 1 to 6 As shown, further, gears are installed on the input gear shaft 5 and the intermediate gear shaft 6 , the input gear shaft 5 is transmission-connected to the intermediate gear shaft 6 via gears, and the gears on the intermediate gear shaft 6 are meshed with the output gear 7 .

[0049] The beneficial effect of adopting the above further technical solution is that when dual motors are input, the power input from the dual motors is merged through the mutual meshing of the mechanical gears, the gears on the input gear shaft, the gears on the intermediate gear shaft and the output gears. Gear transmission improves the stability and reliability of the system.

[0050] like Figures 1 to 6 As shown, further, the high-gear driving gear 9 is mounted on the low-gear driving gear shaft 8 through a spline.

[0051] The beneficial effect of adopting the above further technical solution is that it is convenient for the low-speed driving gear shaft to drive the high-speed driving gear to rotate synchronously.

[0052] like Figures 1 to 6 As shown, further, the four-wheel drive output and parking common gear 16 is installed on the transmission shaft, the wet four-wheel drive clutch assembly 17 is coaxially arranged with the four-wheel drive output and parking common gear 16, and the transmission shaft of the four-wheel drive output and parking common gear 16 is connected with a normally closed parking mechanism 18.

[0053] The beneficial effect of adopting the above-mentioned further technical solution is that the normally closed parking mechanism is normally closed when not started, the normally closed parking mechanism locks the four-wheel drive output and parking common gear, the four-wheel drive input gear and the four-wheel drive output and parking common gear are meshed with each other, so that the small cone output shaft cannot rotate; after power is turned on, the pressure oil compresses the normally closed parking mechanism spring to release the parking.

[0054] Furthermore, the engagement sleeve 11 is connected to an automatic gear shift control mechanism.

[0055] The beneficial effect of adopting the above further technical solution is that the automatic gear shift control mechanism can control the meshing sleeve to slide left and right on the gear hub to engage with the high gear or low gear passive gear to realize the automatic gear shift function.

[0056] The present invention provides a tractor transmission system structure (a dual-motor two-speed electric tractor transmission system) driven by a dual-motor two-speed gearbox and a PTO independently driven tractor.

[0057] like Figures 1 to 6As shown, 1. high-gear transmission route: the motor controller 2 controls the first drive motor 3 and the second drive motor 4 respectively → the input gear shaft 5 and the intermediate gear shaft 6 are meshed with each other; the intermediate gear shaft 6 and the output gear 7 are meshed again → the output gear 7 is assembled on the low-gear driving gear shaft 8 through a spline; → the high-gear driving gear 9 (assembled on the low-gear driving gear shaft 8 through a spline); → the high-gear driven gear 10 → the meshing sleeve 11 (the meshing sleeve 11 is slidably connected with the high-gear driven gear 10); → the gear hub 12 (the gear hub 12 is mounted on the small tapered output shaft 14); → transmitted all the way to the small tapered output shaft 14; → the differential assembly 20; → the left final drive 21 and the right final drive 22.

[0058] Transmitted all the way to the four-wheel drive input gear 15; → four-wheel drive output and parking shared gear 16 → wet four-wheel drive clutch assembly 17 is combined and transmitted to the front axle 19 through the transmission shaft; → front axle 19.

[0059] 2. Low gear transmission route: the motor controller 2 controls the first drive motor 3 and the second drive motor 4 respectively → the input gear shaft 5 and the gears on the intermediate gear shaft 6 are meshed with each other; the gears on the intermediate gear shaft 6 and the output gear 7 are meshed again → the output gear 7 is assembled on the low gear driving gear shaft 8 through a spline; → the low gear driving gear shaft 8; → the low gear driven gear 13 → the meshing sleeve 11 (the meshing sleeve 11 is slidably connected with the low gear driven gear 13); → the gear hub 12 (the gear hub 12 is mounted on the small tapered output shaft 14); → transmitted all the way to the small tapered output shaft 14; → the differential assembly 20; → the left final drive 21 and the right final drive 22.

[0060] Transmitted all the way to the four-wheel drive input gear 15; → four-wheel drive output and parking shared gear 16 → wet four-wheel drive clutch assembly 17 is combined and transmitted to the front axle 19 through the transmission shaft; → front axle 19.

[0061] 3. PTO driving route: the motor controller 2 controls the PTO motor 23 to directly drive → PTO 24.

[0062] 4. Electronic parking: The normally closed parking mechanism 18 is normally closed when not started. The normally closed parking mechanism 18 locks the four-wheel drive output and parking common gear 16, and the four-wheel drive input gear 15 and the four-wheel drive output and parking common gear 16 are meshed with each other, so that the small cone output shaft 14 cannot rotate; after power is turned on, the pressure oil compresses the spring of the normally closed parking mechanism 18 to release the parking.

[0063] 5. Automatic shifting function: The automatic shifting control mechanism (hydraulic cylinder or electronic shift fork) can control the meshing sleeve 11 to slide left and right on the gear hub 12 to engage with the high gear or low gear passive gear to realize the automatic shifting function.

[0064] 6. Power confluence: When dual motors are input, the power confluence of the dual motor inputs is achieved through the mutual meshing of mechanical gears, the gears on the input gear shaft 5, the gears on the intermediate gear shaft 6, and the output gear 7.

[0065] The dual-motor two-speed electric tractor transmission system provided in the embodiment of the present invention is a dual-motor driven two-speed tractor transmission (dual-motor two-speed electric tractor transmission system) with dual-motor input, power merging and motor direct-drive PTO.

[0066] The dual-motor driven two-speed tractor transmission (dual-motor two-speed electric tractor transmission system) has a simple structure. The dual-motor input ensures that the drive system is more reliable and can operate in environments with requirements on noise and emissions.

[0067] In addition, the present invention also provides a tractor, comprising a dual-motor two-speed electric tractor transmission system as described in any one of the above.

[0068] The beneficial effects of the technical solution of the present invention are as follows: the two-speed electric tractor transmission system has the advantage of stepless speed change, simplifies the complex transmission structure of the gearbox, and only needs to retain two gears to meet the requirements of the operating speed of various working conditions. The two-speed electric tractor transmission system is not only simplified in structure and low in cost, but also can replace the stepless CVT gearbox. The electric tractor can be operated in two sections, and the power confluence of the dual motors can provide more reliable power transmission for the transmission system. If one motor is damaged, the other motor can also work. The dual motor input ensures that the drive system is more reliable and can operate in an environment with requirements for noise and emissions.

[0069] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-motor two-speed electric tractor transmission system, characterized in that: include: A first drive motor (3), a second drive motor (4), a low-gear driving gear shaft (8), a high-gear driving gear (9), a high-gear passive gear (10), a meshing sleeve (11), a gear hub (12), a low-gear passive gear (13), a small tapered output shaft (14), a four-wheel drive input gear (15), a four-wheel drive output and parking common gear (16), a wet four-wheel drive clutch assembly (17), a front axle (19), a differential assembly (20), a left final drive (21), and a right final drive (22), wherein the first drive motor (3) and the second drive motor (4) are both connected to the low-gear The low-gear driving gear shaft (8) is connected in transmission connection, the low-gear driving gear shaft (8) is provided with a low-gear driving gear, the high-gear driving gear (9) is mounted on the low-gear driving gear shaft (8), the high-gear passive gear (10), the gear hub (12), the low-gear passive gear (13), and the four-wheel drive input gear (15) are all mounted on the small cone output shaft (14); the high-gear passive gear (10) meshes with the high-gear driving gear (9), the low-gear passive gear (13) meshes with the low-gear driving gear on the low-gear driving gear shaft (8), and the meshing sleeve ( 11) is slidably mounted on the small tapered output shaft (14); the four-wheel drive output and parking common gear (16) is meshed with the four-wheel drive input gear (15); the wet four-wheel drive clutch assembly (17) is drivingly connected to the four-wheel drive output and parking common gear (16); the front axle (19) is drivingly connected to the wet four-wheel drive clutch assembly (17); the differential assembly (20) is drivingly connected to the small tapered output shaft (14); the left final drive (21) and the right final drive (22) are both drivingly connected to the differential assembly (20); the first The drive motor (3) and the second drive motor (4) are both connected to a motor controller (2), and the motor controller (2) is connected to a power battery (1); the motor controller (2) is connected to a PTO motor (23), and the PTO motor (23) is connected to a PTO (24); the four-wheel drive output and parking common gear (16) is mounted on a transmission shaft, the wet four-wheel drive clutch assembly (17) is coaxially arranged with the four-wheel drive output and parking common gear (16), and the transmission shaft of the four-wheel drive output and parking common gear (16) is connected to a normally closed parking mechanism (18).

2. A dual-motor two-speed electric tractor transmission system according to claim 1, characterized in that: The first drive motor (3) and the second drive motor (4) are respectively connected to an input gear shaft (5); an output gear (7) is mounted on the low gear driving gear shaft (8); the input gear shaft (5) drivingly connected to the first drive motor (3) and the input gear shaft (5) drivingly connected to the second drive motor (4) are both drivingly connected to the output gear (7).

3. A dual-motor two-speed electric tractor transmission system according to claim 2, characterized in that: An input gear shaft (5) drivingly connected to the first drive motor (3) and an input gear shaft (5) drivingly connected to the second drive motor (4) are respectively drivingly connected to an intermediate gear shaft (6); the intermediate gear shaft (6) drivingly connected to the first drive motor (3) and the intermediate gear shaft (6) drivingly connected to the second drive motor (4) are both drivingly connected to the output gear (7); the output gear (7) is mounted on the low-speed driving gear shaft (8) via a spline.

4. A dual-motor two-speed electric tractor transmission system according to claim 3, characterized in that: Gears are mounted on both the input gear shaft (5) and the intermediate gear shaft (6); the input gear shaft (5) is transmission-connected to the intermediate gear shaft (6) via the gears; and the gears on the intermediate gear shaft (6) are meshed with the output gear (7).

5. The dual-motor two-speed electric tractor transmission system according to claim 1, characterized in that: The high-gear driving gear (9) is mounted on the low-gear driving gear shaft (8) via a spline.

6. A dual-motor two-speed electric tractor transmission system according to claim 1, characterized in that: The engagement sleeve (11) is connected to an automatic gear shift control mechanism.

7. A tractor, characterized in that: A dual-motor two-speed electric tractor transmission system comprising any one of claims 1 to 6 above.

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