A pure electric tractor gearbox assembly

Abstract

The application discloses a pure electric tractor gearbox assembly and belongs to the technical field of gearbox assemblies. The pure electric tractor gearbox assembly comprises a main motor input shaft, an auxiliary motor input shaft, a PTO transmission unit, a walking transmission unit, a planetary reduction unit and a gear shifting control unit. The auxiliary motor input shaft is coaxially arranged outside the main motor input shaft. The main motor input shaft is provided with a main motor input gear. The auxiliary motor input shaft is provided with an auxiliary motor input gear. The application adopts a main and auxiliary dual-motor input structure, can flexibly switch single motor driving and dual-motor coupling output modes, is suitable for various working conditions, is matched with a wet clutch and a meshing sleeve control, can realize 15 power combination modes, is flexible in power distribution, and effectively improves the working condition adaptability and working versatility of the whole machine.

Description

Technical Field

[0001] This invention relates to the field of gearbox assembly technology, and more particularly to a gearbox assembly for a pure electric tractor. Background Technology

[0002] With the continuous leap in the level of agricultural mechanization in my country, tractors, as the core power equipment for field operations, are constantly expanding their application scenarios and increasing their operational demands. From spring plowing and tilling to autumn harvest and transportation, the attendance intensity and load requirements of tractors have significantly increased, becoming a key support for ensuring food production security and improving agricultural operation efficiency. The upgrading of agricultural machinery and equipment is profoundly changing traditional farming methods and promoting my country's agriculture to move towards large-scale and intensive development.

[0003] Currently, my country's pure electric tractor industry is in its initial stage. Existing products generally use a single-motor, single-input transmission architecture, which has problems such as narrow power coverage and insufficient energy consumption control. Due to the physical bottleneck of battery energy density, the single-motor configuration is caught in a dilemma between generating strong power and maintaining long-term range: if heavy-duty deep plowing is desired, the range will be drastically reduced; if long-term operation is desired, the power will be weak. It is difficult to achieve both, which hinders the comprehensive replacement and in-depth promotion of electric tractors in field operations. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that the range and power of a single motor configuration are difficult to meet the needs of the application scenario due to the physical bottleneck of battery energy density. Therefore, this invention proposes a pure electric tractor gearbox assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pure electric tractor gearbox assembly includes a main motor input shaft, an auxiliary motor input shaft, a PTO transmission unit, a travel transmission unit, a planetary reduction unit, and a shift control unit. The auxiliary motor input shaft is coaxially sleeved on the outside of the main motor input shaft. A main motor input gear is mounted on the main motor input shaft, and an auxiliary motor input gear is mounted on the auxiliary motor input shaft. The PTO transmission unit includes a PTO input shaft, a wet clutch I, a wet clutch III, an auxiliary motor PTO driven gear I, an auxiliary motor PTO driving gear II, and an auxiliary motor PTO driven gear III. Gear 2, a double driven gear and a double driving gear; the auxiliary motor input gear meshes with the auxiliary motor PTO driven gear 1, and a wet clutch 1 is located between the auxiliary motor PTO driven gear 1 and the auxiliary motor PTO driving gear 2, used to control the power supply from the auxiliary motor to the PTO input shaft; the main motor input gear meshes with the auxiliary motor PTO driven gear 2, and a wet clutch 3 is located between the auxiliary motor PTO driven gear 2 and the auxiliary motor PTO driving gear 2, used to control the power supply from the main motor to the PTO input shaft; the auxiliary motor PTO driving gear 2 meshes with the double driven gear, the double driven gear and the double driving gear are coaxially fixedly connected, and the double driving gear is driven by the PTO input shaft.

[0006] Preferably, the walking transmission unit includes a second wet clutch, a fourth wet clutch, a secondary motor driven gear, a primary motor input driven gear, and a small bevel gear; the secondary motor input gear is meshed with the secondary motor driven gear, the fourth wet clutch is located between the secondary motor driven gear and the input end of the planetary reduction unit, and is used to control the power supply from the secondary motor to the walking end; the primary motor input gear is simultaneously meshed with the primary motor input driven gear, and the second wet clutch is located between the primary motor input driven gear and the other input end of the planetary reduction unit, and is used to control the power supply from the primary motor to the walking end.

[0007] Preferably, the planetary reduction unit includes a coaxially arranged ring gear, a sun gear, planetary gears, and a planet carrier. The planetary gears mesh with the external teeth of the sun gear and the internal teeth of the ring gear. The planetary gears are mounted on the planet carrier via pins. The ring gear is connected to the auxiliary motor side power, the sun gear is connected to the main motor side power, and the planet carrier serves as the unified output end for the walking power.

[0008] Preferably, the shift control unit includes a power distribution engagement sleeve and a high / low gear engagement sleeve; the power distribution engagement sleeve is circumferentially fixedly connected to the gearbox housing, and the power distribution engagement sleeve can slide axially, used to lock or unlock the sun gear and the ring gear relative to each other in the gearbox housing; the high / low gear engagement sleeve is axially slidably disposed between the planetary carrier and the small bevel gear; in the high gear position, the planetary carrier is directly connected to the small bevel gear for transmission; in the low gear position, the planetary carrier is transmitted to the small bevel gear after two stages of reduction through the low gear driving gear, the double driven gear, the double driving gear, and the low gear driven gear.

[0009] Preferably, the gearbox is equipped with two independent power sources, namely a high-power main motor and a low-power auxiliary motor. The two motors can be powered individually or coupled simultaneously.

[0010] Preferably, the wet clutch one, wet clutch two, wet clutch three, and wet clutch four are all hydraulically independently controlled, each corresponding to control the on / off state of a power transmission path.

[0011] Preferably, the double driven gear and the double driving gear are fixedly connected to the same support shaft to form a double gear set, which participates in both PTO transmission and low-gear deceleration transmission.

[0012] Compared with the prior art, the present invention provides a pure electric tractor gearbox assembly, which has the following beneficial effects: 1. The pure electric tractor's gearbox assembly adopts a dual-motor independent input architecture, which can flexibly switch between single-motor independent drive and dual-motor coupled output modes according to the working load. It has a wider power coverage range and can adapt to various different working conditions such as light-load road transport, medium-load field sowing, and heavy-load plowing and rotary tillage. With the combined control of four sets of wet clutches and shift engagement sleeves, it can realize a total of 15 power combination modes, including single-motor PTO output, single-motor travel output, dual-motor coupled output, and dual-motor split drive PTO and travel. The power distribution is highly flexible and can fully meet the power needs of pure electric tractors in different working scenarios, improving the adaptability and versatility of the whole machine.

[0013] 2. This pure electric tractor gearbox assembly can match the corresponding transmission ratio according to the working load and driving speed, and adjust the motor speed to the efficient working range, effectively reducing unnecessary power loss, alleviating the pain point of insufficient range of pure electric tractors, and extending the working time of a single charge. Under single input conditions, the power end in the non-working state can be directly locked to the gearbox housing through the power distribution engagement sleeve, without the need for additional independent braking devices. This simplifies the overall transmission structure, reduces the number of parts and assembly costs, and makes the gearbox layout more compact and the transmission link shorter, further improving the reliability and transmission efficiency of the whole machine.

[0014] The parts not covered in this device are the same as or can be implemented using existing technologies. This invention adopts a main and auxiliary dual-motor input architecture, which can flexibly switch between single-motor drive and dual-motor coupled output modes, adapting to various working conditions. With the help of wet clutch and engagement sleeve control, it can realize 15 power combination modes, with flexible power distribution, effectively improving the adaptability and versatility of the whole machine. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram illustrating the principle of the present invention.

[0016] In the diagram: 1. Main motor input shaft; 2. Auxiliary motor input shaft; 3. Auxiliary motor input gear; 4. Auxiliary motor PTO driven gear one; 5. Wet clutch one; 6. Wet clutch two; 7. Main motor input gear; 8. Auxiliary motor PTO driving gear two; 9. Wet clutch three; 10. Auxiliary motor PTO driven gear two; 11. Double driven gear; 12. PTO input shaft; 13. Double driving gear; 14. Auxiliary motor driven gear; 15. Wet clutch four; 16. Power distribution engagement sleeve; 17. Main motor input driven gear; 18. Gear ring; 19. Planetary gear; 20. Sun gear; 21. Planetary carrier; 22. Low-gear driving gear; 23. High-low gear engagement sleeve; 24. Low-gear driven gear; 25. Small bevel gear. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Example: Reference Figures 1-2A pure electric tractor gearbox assembly includes a main motor input shaft 1, an auxiliary motor input shaft 2, a PTO transmission unit, a travel transmission unit, a planetary reduction unit, and a shift control unit. The auxiliary motor input shaft 2 is coaxially sleeved on the outside of the main motor input shaft 1. A main motor input gear 7 is mounted on the main motor input shaft 1, and an auxiliary motor input gear 3 is mounted on the auxiliary motor input shaft 2. The PTO transmission unit includes a PTO input shaft 12, a wet clutch 5, a wet clutch 9, an auxiliary motor PTO driven gear 4, an auxiliary motor PTO driven gear 8, an auxiliary motor PTO driven gear 10, a double driven gear 11, and a double driven gear 13. The auxiliary motor input gear 3 and the auxiliary motor PTO drive gear 2... The PTO driven gear 14 is engaged with the auxiliary motor PTO driven gear 14 and the auxiliary motor PTO driving gear 28, and is used to control the power supply from the auxiliary motor to the PTO input shaft 12; the main motor input gear 7 is engaged with the auxiliary motor PTO driven gear 20, and the wet clutch 3 9 is used to control the power supply from the main motor to the PTO input shaft 12; the auxiliary motor PTO driving gear 28 is engaged with the double driven gear 11, the double driven gear 11 is coaxially fixedly connected with the double driving gear 13, and the double driving gear 13 is engaged with the PTO input shaft 12.

[0020] In this embodiment, two sets of wet clutches independently control the power input from the main and auxiliary motors to the PTO, enabling single-source drive and dual-source power coupling of the PTO output. The transmission form of constant mesh gears combined with the clutch on and off ensures that the gears remain engaged during power switching, preventing gear grinding and ensuring smooth power connection. After the dual power sources converge into the same drive gear, they are transmitted to the PTO input shaft 12 via a double gear set. The transmission link is simple, the output speed is stable, and it can adapt to the constant speed operation requirements of agricultural machinery with different power levels. The clutch is located at the front end of the transmission path, which can prevent the rear gear from moving unloaded when the power is cut off, reducing useless friction loss. At the same time, the PTO output end can stop quickly, improving the safety of operation.

[0021] Reference Figure 1 and Figure 2As shown, the walking transmission unit includes a second wet clutch 6, a fourth wet clutch 15, a secondary motor driven gear 14, a primary motor input driven gear 17, and a small bevel gear 25. The secondary motor input gear 3 is meshed with the secondary motor driven gear 14. The fourth wet clutch 15 is located between the secondary motor driven gear 14 and the input end of the planetary reduction unit, and is used to control the power supply from the secondary motor to the walking end. The primary motor input gear 7 is also meshed with the primary motor input driven gear 17. The second wet clutch 6 is located between the primary motor input driven gear 17 and the other input end of the planetary reduction unit, and is used to control the power supply from the primary motor to the walking end.

[0022] In this embodiment, the walking power adopts a dual-path independent front-mounted clutch layout. The main and auxiliary motor power are respectively connected to the two independent input ends of the planetary reduction mechanism through their respective gear pairs and clutches. The power on / off control is directly front-mounted, which can complete the engagement and disengagement of walking power while the motor is running continuously, without the need for frequent motor start-stop. In the single-motor drive mode, the other unconnected transmission chain is in a stationary state, which can avoid the oil churning of idle gears and the friction loss of bearings during idle rotation, effectively improving the transmission efficiency. The two power paths are respectively connected to the two input ends of the planetary mechanism, and the two transmission paths do not interfere with each other, resulting in smooth power transmission. This provides a stable structural foundation for the subsequent dual-motor power coupling and has a strong load-bearing capacity. It is worth noting that the dual motors can theoretically achieve 15 operating modes to meet more usage scenarios, such as the following operating modes: In the following description, motor 1 refers to the main motor, and motor 2 refers to the auxiliary motor. Motor 1 ➡ PTO Motor 1 ➡ Walking Motor 1 ➡ PTO + Walking Motor 2 ➡ PTO Motor 2 ➡ Walking Motor 2 ➡ PTO + Walking Motor 1+2 → PTO Motor 1+2 → Travel Motor 1+2 → PTO + Travel Motor 1 → PTO, Motor 2 → Walking Motor 1 → PTO, Motor 2 → PTO + Walking Motor 1 → Walking, Motor 2 → PTO Motor 1 → Walking, Motor 2 → PTO + Walking Motor 1 → PTO + Walking, Motor 2 → PTO Motor 1 → PTO + Walking, Motor 2 → Walking.

[0023] Reference Figure 1 and Figure 2As shown, the planetary reduction unit includes a coaxially arranged ring gear 18, a sun gear 20, a planetary gear 19, and a planet carrier 21. The planetary gear 19 meshes with the external teeth of the sun gear 20 and the internal teeth of the ring gear 18. The planetary gear 19 is mounted on the planet carrier 21 via a pin. The ring gear 18 is connected to the auxiliary motor side power, the sun gear 20 is connected to the main motor side power, and the planet carrier 21 serves as the unified output end for the walking power.

[0024] In this embodiment, an NGW-type planetary gear 19 transmission system is used to achieve dual-path power convergence. The gear ring 18 and the sun gear 20 serve as two independent input ends, respectively connected to the auxiliary motor and the main motor. After the power is evenly distributed by multiple planetary gears 19, it is uniformly output by the planetary carrier 21. The coaxial arrangement reduces the radial dimension of the gearbox, resulting in high structural compactness and adaptability to the limited installation space of the tractor chassis. The structure with multiple planetary gears 19 sharing the load can distribute the tooth surface load, improve the overall load-bearing capacity and impact resistance, and adapt to the heavy-load and bumpy working conditions of tractor field operations. At the same time, the dual-input planetary carrier 21 structure can simultaneously achieve the dual functions of power coupling and deceleration and torque increase, resulting in high transmission efficiency and power density that is significantly better than ordinary fixed-axis gear transmission structures.

[0025] Reference Figure 1 and Figure 2 As shown, the shift control unit includes a power distribution engagement sleeve 16 and a high / low gear engagement sleeve 23. The power distribution engagement sleeve 16 is circumferentially fixed to the gearbox housing and can slide axially to lock or unlock the sun gear 20 and the ring gear 18 relative to each other in the gearbox housing. The high / low gear engagement sleeve 23 is axially slidably disposed between the planetary carrier 21 and the small bevel gear 25. In the high gear position, the planetary carrier 21 is directly connected to the small bevel gear 25 for transmission. In the low gear position, the planetary carrier 21 is transmitted to the small bevel gear 25 after passing through two stages of reduction: the low gear drive gear (22), the double driven gear 11, the double drive gear 13, and the low gear driven gear 24.

[0026] In this embodiment, the shift control unit adopts a scheme of two sets of meshing sleeves working together. The power distribution meshing sleeve 16 is circumferentially fixed to the gearbox housing and can only slide axially. It locks the sun gear 20 or the gear ring 18 respectively through internal and external spline meshing. It can directly fix the reaction element of the planetary mechanism when a single motor input is used, without the need to set up an additional independent brake, which simplifies the overall structure. The high and low gear meshing sleeve 23 is set at the output end of the planet carrier 21. It achieves two-speed mechanical adjustment of high and low gears by switching between two paths: direct output and two-stage reduction output. It effectively expands the torque and speed coverage range of the walking output. Both sets of meshing sleeves adopt a spline fit structure, which is reliable in positioning, transmits large torque, and has a simple structure that is easy to process. It is suitable for the low cost and easy maintenance requirements of agricultural machinery. It is worth noting that the power distribution engagement sleeve 16 has three working positions: when it slides to the leftmost end, the power distribution engagement sleeve 16 simultaneously engages the housing fixing spline and the external spline of the sun gear 20, locking the sun gear 20 in place. At this time, the gear ring 18 inputs power, the sun gear 20 is fixed, and the planet carrier 21 outputs deceleration power. When the power distribution engagement sleeve 16 is slid to the far right, it engages the housing fixing spline and the external spline of the gear ring 18, locking the gear ring 18 in place. At this time, the sun gear 20 inputs power, the gear ring 18 is fixed, and the planet carrier 21 outputs deceleration power. When in the middle position, both the sun gear 20 and the ring gear 18 are in a free state and can be powered simultaneously. After power coupling is achieved in the planetary mechanism, the power is output by the planet carrier 21. The high and low gear meshing sleeve 23 is also set with three working positions: when it slides to the high position on the left end, the spline on the end of the planet carrier 21 directly meshes with the spline on the end of the small bevel gear 25, and the power is directly output to the small bevel gear 25. When sliding to the right end low gear position, the power of the planetary carrier 21 is first transmitted to the low gear drive gear 22, and then through the two-stage fixed-axis reduction mechanism composed of the double driven gear 11, the double drive gear 13, and the low gear driven gear 24 to reduce speed and increase torque, and then transmitted to the small bevel gear 25 to output greater torque. When in the middle position, it is in neutral, and the power transmission between the planetary carrier 21 and the small bevel gear 25 is interrupted.

[0027] Reference Figure 1 and Figure 2 As shown, the gearbox is equipped with two independent power sources: a high-power main motor and a low-power auxiliary motor. The two motors can input power individually or simultaneously.

[0028] In this embodiment, a dual power source configuration is adopted, consisting of a high-power main motor and a low-power auxiliary motor. The two power sources are independent of each other and can be started, stopped, and speed adjusted independently, providing a flexible power input basis for the gearbox. It is worth noting that during light-load transfers and low-load operations, starting only a small-power auxiliary motor is sufficient to meet the power requirements, avoiding the inefficiency of high-power motors operating at low loads; under heavy-load plowing, rotary tillage, and other working conditions, starting both motors simultaneously and outputting power through power coupling can provide sufficient high-torque operating power. The combination of large and small power configurations optimizes the distribution range of motor operating points, expanding the coverage of the high-efficiency operating range compared to single-motor solutions, and providing structural support for overall energy consumption optimization.

[0029] Reference Figure 1 and Figure 2As shown, wet clutch 1 (5), wet clutch 2 (6), wet clutch 3 (9), and wet clutch 4 (15) are all hydraulically independently controlled, each corresponding to control the on / off state of a power transmission path.

[0030] In this embodiment, all four wet clutches adopt a hydraulic independent control scheme. Each clutch corresponds to an independent power transmission path. The clamping force and engagement speed of the friction plates can be precisely controlled through the hydraulic system, resulting in fast power on / off response and high control precision. Wet friction plates work in an oil environment, have excellent heat dissipation performance, can withstand long-term sliding friction and frequent engagement operations, and can adapt to the frequent switching of working conditions of tractors. The independently controlled layout allows for the individual switching on and off of any power path, providing high flexibility in power combinations. Furthermore, the clutch adopts an integrated layout structure, offering excellent sealing performance and a long maintenance cycle, making it adaptable to harsh working environments such as dusty and humid conditions in the field.

[0031] Reference Figure 1 and Figure 2 As shown, the double driven gear 11 and the double driving gear 13 are fixedly connected to the same support shaft to form a double gear set, which participates in both PTO transmission and low-gear reduction transmission for travel.

[0032] In this embodiment, the double-drive gear 11 and the double-drive gear 13 are used together, serving as the intermediate reduction stage of the PTO transmission and the intermediate reduction stage of the low-gear transmission. This achieves a reuse design where one set of gears serves two transmission paths simultaneously. This structure can reduce the setting of a set of independent intermediate gear shafts, effectively compress the axial and radial space inside the gearbox, improve the overall integration, increase the commonality of parts, reduce the types of parts and mold investment, and reduce production and manufacturing costs.

[0033] In this invention, a transmission architecture with coaxial nested input of main and auxiliary dual motors is adopted. Power is output through the input shaft 1 of the main motor and the input shaft 2 of the auxiliary motor respectively. The on and off of each power path is controlled by four sets of independently hydraulically controlled wet clutches, which can flexibly realize various power combinations such as PTO output, walking output and a combination of both. In the PTO transmission path, the power of the main and auxiliary motors is fed into the auxiliary motor PTO drive gear 8 through the corresponding gear pairs and wet clutches, and then transmitted to the PTO input shaft 12 after being reduced by the double gear set. This can realize independent drive of a single motor or coupled drive of a dual motor to the PTO. The power switching is smooth without gear impact, which is suitable for the constant speed operation requirements of agricultural machinery of different power levels. In the travel transmission path, the main and auxiliary motor power is connected to the sun gear 20 and the ring gear 18 of the planetary reduction unit through the corresponding gear pairs and wet clutches, respectively. By axial sliding switching of the power distribution meshing sleeve 16, the sun gear 20 or the ring gear 18 can be locked to realize single motor reduction input, or both ends can be unlocked to realize dual motor power coupling input. After the power is uniformly output through the planetary carrier 21, the high and low gear meshing sleeve 23 selects to directly connect to the high gear or two-stage reduction low gear, and finally transmits it to the small bevel gear 25 to output to the rear axle of the travel. The system can generate a variety of working modes through the dual-motor configuration, multi-clutch switching and the coordinated control of two sets of meshing sleeves. With two-speed mechanical speed regulation, the motor can maintain a high-efficiency working range, which combines high power output and low energy consumption. The gear reuse design also simplifies the overall structure and improves integration, making it suitable for the diverse field operation conditions of tractors.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pure electric tractor gearbox assembly, characterized in that, It includes the main motor input shaft (1), the auxiliary motor input shaft (2), the PTO transmission unit, the walking transmission unit, the planetary reduction unit and the shift control unit; The auxiliary motor input shaft (2) is coaxially sleeved on the outside of the main motor input shaft (1). The main motor input shaft (1) is provided with a main motor input gear (7), and the auxiliary motor input shaft (2) is provided with an auxiliary motor input gear (3). The PTO transmission unit includes a PTO input shaft (12), a wet clutch one (5), a wet clutch three (9), a secondary motor PTO driven gear one (4), a secondary motor PTO driving gear two (8), a secondary motor PTO driven gear two (10), a double driven gear (11) and a double driving gear (13). The auxiliary motor input gear (3) is meshed with the auxiliary motor PTO driven gear one (4), and the wet clutch one (5) is located between the auxiliary motor PTO driven gear one (4) and the auxiliary motor PTO driving gear two (8) to control the power supply of the auxiliary motor to the PTO input shaft (12). The main motor input gear (7) is meshed with the auxiliary motor PTO driven gear two (10), and the wet clutch three (9) is located between the auxiliary motor PTO driven gear two (10) and the auxiliary motor PTO driving gear two (8) to control the power supply from the main motor to the PTO input shaft (12). The auxiliary motor PTO drive gear 2 (8) is meshed with the double passive gear (11), the double passive gear (11) is coaxially fixedly connected with the double drive gear (13), and the double drive gear (13) is driven by the PTO input shaft (12).

2. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The walking transmission unit includes a wet clutch 2 (6), a wet clutch 4 (15), a secondary motor driven gear (14), a main motor input driven gear (17), and a small bevel gear (25). The secondary motor input gear (3) is meshed with the secondary motor driven gear (14). The wet clutch 4 (15) is located between the secondary motor driven gear (14) and the input end of the planetary reduction unit, and is used to control the power supply from the secondary motor to the walking end. The main motor input gear (7) is also meshed with the main motor input driven gear (17). The wet clutch 2 (6) is located between the main motor input driven gear (17) and the other input end of the planetary reduction unit, and is used to control the power supply from the main motor to the walking end.

3. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The planetary reduction unit includes a coaxially arranged ring gear (18), a sun gear (20), a planetary gear (19), and a planet carrier (21). The planetary gear (19) meshes with the external teeth of the sun gear (20) and the internal teeth of the ring gear (18). The planetary gear (19) is mounted on the planet carrier (21) via a pin. The ring gear (18) is connected to the auxiliary motor side power, and the sun gear (20) is connected to the main motor side power. The planet carrier (21) serves as the unified output end for the walking power.

4. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The shift control unit includes a power distribution engagement sleeve (16) and a high-low gear engagement sleeve (23). The power distribution engagement sleeve (16) is circumferentially fixed to the gearbox housing and can slide axially. It is used to lock or unlock the sun gear (20) and the ring gear (18) relative to each other in the gearbox housing. The high-low gear engagement sleeve (23) is axially slidably arranged between the planet carrier (21) and the small bevel gear (25). In the high gear position, the planet carrier (21) is directly connected to the small bevel gear (25) for transmission. In the low gear position, the planet carrier (21) is transmitted to the small bevel gear (25) after passing through the low gear drive gear (22), the double driven gear (11), the double drive gear (13), and the low gear driven gear (24) in two stages of reduction.

5. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The gearbox is equipped with two independent power sources: a high-power main motor and a low-power auxiliary motor. The two motors can be powered individually or coupled simultaneously.

6. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The wet clutches 1 (5), 2 (6), 3 (9), and 4 (15) are all hydraulically independently controlled, each corresponding to the control of the opening and closing of a power transmission path.

7. The pure electric tractor gearbox assembly according to claim 1, characterized in that, The double-drive gear (11) and the double-drive gear (13) are fixedly connected on the same support shaft to form a double gear set, which participates in both PTO transmission and low-gear deceleration transmission.

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