Transmission system of pure electric tractor

Abstract

The invention provides a pure electric tractor transmission system which comprises a first motor, a second motor, a walking output shaft, a clutch and a PTO main output shaft, an output shaft of the second motor is in transmission connection with the walking output shaft, and a rear central gear is fixed to one end of the walking output shaft; the first end of an output shaft of the first motor is in transmission connection with a transmission shaft, the transmission shaft coaxially penetrates through an output shaft of the second motor and is rotationally connected with the output shaft of the second motor, the transmission shaft is in transmission connection with the input end of the clutch, and the output end of the clutch is in transmission connection with a PTO main output shaft. According to the invention, the PTO output rotating speed and the walking rotating speed of the tractor are independently controlled through the first motor and the second motor, so that a complicated transfer link in a transmission process is omitted, the structure is simple, and the operation is convenient; the first motor and the second motor operate independently and do not interfere with each other, and reliability is good.

Description

Technical Field

[0001] This invention relates to the field of tractor transmission system technology, and specifically to a pure electric tractor transmission system. Background Technology

[0002] Modern agriculture is developing towards intelligent and unmanned operations. The zero-emission nature of electric tractors makes them an important direction for green agriculture. Electric platforms are easier to integrate with systems such as autonomous driving, remote monitoring, and precision operations, providing an ideal platform for intelligent agricultural machinery. At the same time, agricultural machinery drivers are increasingly valuing operational comfort, and electric tractors, with their smooth operation, low noise, and low vibration, significantly improve the driving experience.

[0003] Existing electric tractors use the same motor for both PTO output and travel power, which not only makes the transmission and distribution process complex, but also makes it difficult to independently control the PTO output speed and travel speed, resulting in inconvenient operation. Summary of the Invention

[0004] To solve at least one of the above technical problems, the present invention provides a pure electric tractor transmission system.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides a pure electric tractor transmission system, including a first motor, a second motor, a travel output shaft, a clutch, and a PTO main output shaft. The output shaft of the second motor is drivenly connected to the travel output shaft, and a rear central gear is fixed at one end of the travel output shaft. A drive shaft is drivenly connected to the first end of the output shaft of the first motor. The drive shaft coaxially passes through the output shaft of the second motor and is rotatably connected to the output shaft of the second motor. The drive shaft is drivenly connected to the input end of the clutch, and the output end of the clutch is drivenly connected to the PTO main output shaft.

[0006] The beneficial effects of this invention are: This invention utilizes a second motor to drive the travel output shaft and provide travel power to the tractor, while the first motor drives the PTO (Power Towing Unit) output shaft via a transmission shaft, providing power to the tractor's PTO. This achieves independent control of the PTO output speed and travel speed, eliminating the complex split-drive links in the transmission process. This not only simplifies the structure but also makes operation convenient. The transmission shaft coaxially passes through and rotates through the output shaft of the second motor, allowing the first and second motors to operate independently without interference, ensuring high reliability. Furthermore, the first and second motors can be independently controlled in terms of output speed, thus achieving stepless speed change and avoiding cumbersome frequent gear shifting.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, it also includes a centrally located PTO output shaft, which is connected to the output end of the clutch in a transmission manner.

[0009] The center-mounted PTO output shaft obtains power from the output end of the clutch, realizing the coexistence of center-mounted PTO output and rear-mounted PTO output of the tractor, and is independent of the tractor's walking power. The structure is simplified and the operation is convenient.

[0010] Furthermore, the output end of the clutch is provided with two fixed gears, and the PTO main output shaft is provided with two loose gears. The two loose gears correspond one-to-one with the two fixed gears and mesh with each other. A first meshing device is provided between the two loose gears. The first meshing device is drivenly connected to the PTO main output shaft and can slide axially to engage or disengage with the shifting gear of one of the loose gears. One of the loose gears is drivenly connected to the centrally located PTO output shaft.

[0011] Power can be transmitted to the centrally located PTO output shaft through one of the slip gears, realizing the transmission between the centrally located PTO output shaft and the clutch; at the same time, the transmission relationship between the two slip gears and the PTO main output shaft can be controlled through the first meshing device, realizing the control of the PTO main output shaft speed independently of the centrally located PTO output shaft, which has good flexibility.

[0012] Furthermore, a central PTO gear is movably sleeved on the central PTO output shaft, and the central PTO gear is connected to the loose gear in a transmission connection; a second mesher is provided on one side of the central PTO gear, and the second mesher is connected to the central PTO output shaft in a transmission connection, and can slide axially to engage or disengage with the shifting gear of the central PTO gear.

[0013] It realizes the transmission connection between the central PTO output shaft and the loose gear, which has good transmission reliability; through the second meshing device and the central PTO gear, it is easy to control the power on and off of the central PTO, which is flexible in operation and safe.

[0014] Furthermore, a torsional damper is provided between the drive shaft and the input end of the clutch. The input end of the torsional damper is connected to the drive shaft, and the output end of the torsional damper is connected to the input end of the clutch.

[0015] By filtering the vibrations generated by the drive shaft and the first motor through the torsional damper, the smoothness of the clutch input power is improved, and noise and wear are reduced.

[0016] Furthermore, it also includes a front drive shaft, which is connected to the travel output shaft via a transmission.

[0017] The front drive shaft obtains power from the travel output shaft and can transmit the power to the front axle of the tractor, thus realizing the four-wheel drive function; moreover, the four-wheel drive force and the PTO power are independent of each other, the structure is simplified, and the operation is convenient.

[0018] Furthermore, a front drive gear is movably sleeved on the front drive shaft, and the front drive gear is connected to the travel output shaft for transmission; a shift coupling is provided on one side of the front drive gear, and a third engagement device is provided on the shift coupling, which can slide axially to engage or disengage with the front drive shaft.

[0019] The third engagement mechanism works with the front drive gear to easily control the switching of the tractor's front drive force, enabling the switching between two-wheel drive and four-wheel drive, providing good flexibility.

[0020] Furthermore, a power take-off (PTO) gearbox is also fixed on the first motor. The input shaft of the PTO gearbox is connected to the second end of the output shaft of the first motor, and the output shaft of the PTO gearbox is connected to a front-mounted PTO assembly.

[0021] The power take-off (PTO) gearbox obtains power from the output shaft of the first motor and drives the front PTO assembly, enabling the coexistence of the front and rear PTO outputs of the tractor without affecting the coexistence of the mid-mounted PTO output, thus achieving various combined operating modes.

[0022] Furthermore, an output shaft sleeve is also fitted on the drive shaft, and the output shaft sleeve is connected to the drive shaft through a needle roller bearing; one end of the output shaft sleeve is connected to the output shaft of the second motor, and both the inside of one end of the output shaft sleeve and the inside of the output shaft of the second motor are provided with oil seals, which are fitted on the drive shaft; the output shaft sleeve is connected to the travel output shaft.

[0023] The drive shaft can rotate relative to the output shaft of the second motor. The middle part of the drive shaft is supported by needle roller bearings, which occupies little space, reduces the deflection and vibration of the drive shaft, and improves the stability of the drive shaft. In addition, there is space left at the docking part between the output shaft cylinder and the output shaft of the second motor to install components such as oil seals and needle roller bearings, which facilitates installation and avoids the leakage of lubricating oil in the output shaft cylinder.

[0024] Furthermore, a travel output gear is fixed on the output shaft cylinder, and a travel input gear is fixed on the travel output shaft, with the travel input gear meshing with the travel output gear.

[0025] It realizes the transmission between the output shaft cylinder and the travel output shaft, and the transmission is reliable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the transmission relationship of the PTO's main output shaft.

[0028] Figure 3 This is an enlarged schematic diagram of the transmission relationship of the output shaft of the second motor.

[0029] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-First motor; 2-Second motor; 3-Travel output shaft; 4-Rear central gear; 5-Clutch; 51-Fixed gear; 6-PTO main output shaft; 61-Loop gear; 62-First meshing device; 7-Drive shaft; 8-Central PTO output shaft; 81-Central PTO gear; 82-Second meshing device; 9-Idler gear; 10-Torsion damper; 11-Front drive shaft; 12-Front drive gear; 13-Third meshing device; 14-Power take-off transmission box; 15-Front PTO assembly; 16-Output shaft sleeve; 17-Travel output gear; 18-Travel input gear; 19-Rear central transmission assembly. Detailed Implementation

[0030] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] See also: This invention Figure 1-3 .

[0032] This invention provides a pure electric tractor transmission system, including a first motor 1, a second motor 2, a travel output shaft 3, a clutch 5, and a PTO total output shaft 6. The output shaft of the second motor 2 is drivenly connected to the travel output shaft 3, and a rear central gear 4 is fixed at one end of the travel output shaft 3. A transmission shaft 7 is drivenly connected to the first end of the output shaft of the first motor 1. The transmission shaft 7 coaxially passes through the output shaft of the second motor 2 and is rotatably connected to the output shaft of the second motor 2. The transmission shaft 7 is drivenly connected to the input end of the clutch 5, and the output end of the clutch 5 is drivenly connected to the PTO total output shaft 6.

[0033] principle: During installation, the travel output shaft 3 is rotatably connected to the tractor frame, and the rear central gear 4 is driven by the input shaft of the rear central drive assembly 19 to provide travel power to the tractor; the rear central drive assembly 19 is an existing structure on the tractor. The PTO main output shaft 6 is rotatably connected to the rear-mounted PTO assembly or the tractor frame to connect external implements and provide power to them; the rear-mounted PTO assembly is an existing structure on the tractor.

[0034] During operation, the output shaft of the second motor 2 drives the travel output shaft 3, which in turn drives the tractor's central drive assembly, providing power for the tractor's movement. The output shaft of the first motor 1 transmits power to the input end of the clutch 5 via the drive shaft 7. When the clutch 5 is engaged, its output end transmits power to the PTO main output shaft 6, enabling the electric tractor to independently drive the PTO output. The output shafts of the first motor 1 and the second motor 2 are rotatably connected, allowing the first motor 1 to rotate independently of the second motor 2's output shaft, without affecting the others.

[0035] Preferably, the first motor 1 and the second motor 2 are arranged coaxially and fixedly connected, which saves space. Furthermore, the drive shaft 7 extends into the first end of the output shaft of the first motor 1 and is connected to the first end of the output shaft of the first motor 1 via a spline.

[0036] By employing this invention, the second motor 2 drives the travel output shaft 3 and provides travel power to the tractor, while the first motor 1 drives the PTO total output shaft 6 through the transmission shaft 7, providing power to the tractor's PTO. This achieves independent control of the PTO output speed and travel speed, eliminating the complex split-drive links in the transmission process. This not only simplifies the structure but also makes operation convenient. The transmission shaft 7 coaxially passes through the output shaft of the second motor 2 and is rotatably connected to it, allowing the first motor 1 and the second motor 2 to operate independently without interference, ensuring high reliability. Furthermore, the first motor 1 and the second motor 2 can independently control their output speeds, thereby achieving stepless speed change and avoiding cumbersome frequent gear shifting.

[0037] Furthermore, such as Figure 1-2 As shown: It also includes a centrally located PTO output shaft 8, which is connected to the output end of the clutch 5 for transmission.

[0038] Note: The centrally mounted PTO output shaft 8 can be rotatably connected to the housing of the centrally mounted PTO assembly or the frame of the tractor. Its output end is located in the middle of the tractor and can be used to connect external implements such as lawnmowers and provide them with power. The centrally mounted PTO assembly is an existing structure on tractors.

[0039] The centrally located PTO output shaft 8 obtains power from the output end of the clutch 5, realizing the coexistence of the centrally located PTO output and the rearly located PTO output of the tractor, and is independent of the tractor's walking power. The structure is simple and the operation is convenient.

[0040] Furthermore, the output end of the clutch 5 is provided with two fixed gears 51, and the PTO main output shaft 6 is provided with two loose gears 61. The two loose gears 61 correspond one-to-one with the two fixed gears 51 and mesh with each other. A first meshing device 62 is provided between the two loose gears 61. The first meshing device 62 is connected to the PTO main output shaft 6 for transmission and can slide axially to engage or disengage with the shifting gear of one of the loose gears 61. One of the loose gears 61 is connected to the centrally located PTO output shaft 8 for transmission.

[0041] Note: The shift coupling is a boss structure in the middle of the movable gear. This boss is equipped with an external spline for transmission with the meshing device.

[0042] Power can be transmitted to the central PTO output shaft 8 through one of the loose gears 61, realizing the transmission between the central PTO output shaft 8 and the clutch 5; at the same time, the transmission relationship between the two loose gears 61 and the PTO main output shaft 6 can be controlled through the first meshing device 62, realizing the control of the speed of the PTO main output shaft 6 independently of the central PTO output shaft 8, which has good flexibility.

[0043] Furthermore, a central PTO gear 81 is movably sleeved on the central PTO output shaft 8, and the central PTO gear 81 is connected to the loose gear 61 in a transmission connection; a second meshing device 82 is provided on one side of the central PTO gear 81, and the second meshing device 82 is connected to the central PTO output shaft 8 in a transmission connection, and can slide axially to engage or disengage with the central PTO gear 81 in a shifting engagement.

[0044] Preferably, the central PTO gear 81 is connected to the idler gear 61 via the idler gear 9, that is, the central PTO gear 81, the idler gear 9 and the idler gear 61 mesh in sequence.

[0045] The transmission connection between the central PTO output shaft 8 and the loose gear 61 is realized, and the transmission reliability is good. The second meshing device 82 cooperates with the central PTO gear 81, which facilitates the control of the power on and off of the central PTO, making the operation flexible and safe.

[0046] Furthermore, a torsional damper 10 is provided between the drive shaft 7 and the input end of the clutch 5. The input end of the torsional damper 10 is connected to the drive shaft 7, and the output end of the torsional damper 10 is connected to the input end of the clutch 5.

[0047] Preferably, the input end of the torsional damper 10 is connected to the drive shaft 7 via a spline drive, and the output end of the torsional damper 10 is connected to the input end of the clutch 5 via a spline drive. The torsional damper 10 is an existing product.

[0048] By filtering the vibrations generated by the drive shaft 7 and the first motor 1 through the torsional damper 10, the input power smoothness of the clutch 5 is improved, and noise and wear are reduced.

[0049] Furthermore, such as Figure 1 As shown: It also includes a front drive shaft 11, which is connected to the walking output shaft 3 in a transmission manner.

[0050] Note: The front drive shaft 11 can be rotatably mounted in a separate transmission box or on the tractor frame. One end of the front drive shaft 11 is used to connect to the tractor's front axle or front central drive assembly, both of which are existing structures on the tractor.

[0051] The front drive shaft 11 obtains power from the travel output shaft 3 and can transmit the power to the front axle of the tractor, thus realizing the four-wheel drive function; and the four-wheel drive force and PTO power are independent of each other, with a simplified structure and convenient operation.

[0052] Furthermore, a front drive gear 12 is movably sleeved on the front drive shaft 11, and the front drive gear 12 is connected to the travel output shaft 3 in a transmission manner; a shift coupling is provided on one side of the front drive gear 12, and a third engagement device 13 is provided on the shift coupling, which can slide axially to engage or disengage with the front drive shaft 11.

[0053] Note: The shift coupling and the third engagement 13 are connected via a spline drive. Alternatively, the third engagement 13 can also be connected to the front drive shaft 11 and can slide axially to engage or disengage with the shift coupling of the front drive gear 12. Preferably, the other end of the travel output shaft 3 is provided with a front drive output gear, which is connected to the front drive gear 12 via an idler gear 9.

[0054] The third engagement 13 engages with the front drive gear 12, which facilitates the control of the tractor's front drive force, enabling the switching between two-wheel drive and four-wheel drive, and providing good flexibility.

[0055] Furthermore, a power take-off (PTO) gearbox 14 is also fixed on the first motor 1. The input shaft of the PTO gearbox 14 is connected to the second end of the output shaft of the first motor 1. The output shaft of the PTO gearbox 14 is connected to the front PTO assembly 15.

[0056] Note: The output shaft of the first motor 1 passes through both ends of its housing. The front-mounted PTO assembly 15 is an existing structure on tractors, used to provide power to implements at the front of the tractor. Preferably, the input shaft of the power take-off box 14 is connected to the second end of the output shaft of the first motor 1 via a spline drive; the output shaft of the power take-off box 14 is connected to the input shaft of the front-mounted PTO assembly 15 via a coupling.

[0057] The power take-off transmission box 14 obtains power from the output shaft of the first motor 1 and drives the front PTO assembly 15, realizing the coexistence of the front PTO and rear PTO outputs of the tractor, while not affecting the coexistence of the middle PTO output, thus realizing multiple combined operation modes.

[0058] Furthermore, such as Figure 3 As shown: The transmission shaft 7 is also fitted with an output shaft sleeve 16, which is connected to the transmission shaft 7 by a needle roller bearing; one end of the output shaft sleeve 16 is connected to the output shaft of the second motor 2, and both the inside of one end of the output shaft sleeve 16 and the inside of the output shaft of the second motor 2 are provided with oil seals, which are fitted on the transmission shaft 7; the output shaft sleeve 16 is connected to the travel output shaft 3.

[0059] Preferably, one end of the output shaft cylinder 16 is connected to the second motor 2 via an internal spline sleeve; two needle roller bearings are provided and located inside both ends of the output shaft cylinder 16. The output shaft cylinder 16 can be mounted on an external transmission housing or on the tractor frame via bearings.

[0060] The drive shaft 7 can rotate relative to the output shaft of the second motor 2. The middle part of the drive shaft 7 is supported by a needle roller bearing, which occupies little space, reduces the deflection and vibration of the drive shaft 7, and improves the stability of the drive shaft 7. In addition, there is space left at the docking part between the output shaft cylinder 16 and the output shaft of the second motor 2 to install components such as oil seals and needle roller bearings, which is convenient for installation and avoids the leakage of lubricating oil in the output shaft cylinder 16.

[0061] Furthermore, a travel output gear 17 is fixed on the output shaft cylinder 16, and a travel input gear 18 is fixed on the travel output shaft 3. The travel input gear 18 meshes with the travel output gear 17.

[0062] The transmission between the output shaft cylinder 16 and the traveling output shaft 3 is realized, and the transmission is reliable.

[0063] In the description of this invention, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this invention and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0064] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixation," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixation" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this invention can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0066] In this invention, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" could mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Those skilled in the art can understand the specific meaning of the above descriptive terms in this invention based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0067] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A transmission system for a pure electric tractor, characterized in that: It includes a first motor (1), a second motor (2), a travel output shaft (3), a clutch (5) and a PTO total output shaft (6). The output shaft of the second motor (2) is connected to the travel output shaft (3) in a transmission connection. One end of the travel output shaft (3) is fixed with a rear central gear (4). The first end of the output shaft of the first motor (1) is connected to a transmission shaft (7). The transmission shaft (7) coaxially passes through the output shaft of the second motor (2) and is rotatably connected to the output shaft of the second motor (2). The transmission shaft (7) is connected to the input end of the clutch (5) in a transmission connection. The output end of the clutch (5) is connected to the PTO total output shaft (6) in a transmission connection.

2. The pure electric tractor transmission system according to claim 1, characterized in that: It also includes a centrally located PTO output shaft (8), which is connected to the output end of the clutch (5) via a transmission connection.

3. The pure electric tractor transmission system according to claim 2, characterized in that: The output end of the clutch (5) is provided with two fixed gears (51), and the PTO main output shaft (6) is provided with two loose gears (61). The two loose gears (61) correspond one-to-one with the two fixed gears (51) and mesh with each other. A first meshing device (62) is provided between the two loose gears (61). The first meshing device (62) is connected to the PTO main output shaft (6) and can slide along the axial direction to mesh or disengage with the shifting gear of one of the loose gears (61). One of the loose gears (61) is connected to the central PTO output shaft (8).

4. The pure electric tractor transmission system according to claim 3, characterized in that: A central PTO gear (81) is movably sleeved on the central PTO output shaft (8), and the central PTO gear (81) is connected to the loose gear (61) in a transmission connection; a second mesher (82) is provided on one side of the central PTO gear (81), and the second mesher (82) is connected to the central PTO output shaft (8) in a transmission connection, and can slide along the axial direction to engage or disengage with the central PTO gear (81) in a shifting engagement.

5. The pure electric tractor transmission system according to claim 1, characterized in that: A torsional damper (10) is also provided between the drive shaft (7) and the input end of the clutch (5). The input end of the torsional damper (10) is connected to the drive shaft (7) and the output end of the torsional damper (10) is connected to the input end of the clutch (5).

6. The pure electric tractor transmission system according to claim 1, characterized in that: It also includes a front drive shaft (11), which is connected to the walking output shaft (3) in a transmission manner.

7. The pure electric tractor transmission system according to claim 6, characterized in that: A front drive gear (12) is movably sleeved on the front drive shaft (11), and the front drive gear (12) is connected to the walking output shaft (3) in a transmission connection; a shifting coupling is provided on one side of the front drive gear (12), and a third engagement device (13) is provided on the shifting coupling. The third engagement device (13) can slide along the axial direction to engage or disengage with the front drive shaft (11).

8. The pure electric tractor transmission system according to claim 1, characterized in that: The first motor (1) is also fixed with a power take-off transmission box (14). The input shaft of the power take-off transmission box (14) is connected to the second end of the output shaft of the first motor (1). The output shaft of the power take-off transmission box (14) is connected to the front PTO assembly (15).

9. The pure electric tractor transmission system according to claim 1, characterized in that: The drive shaft (7) is also fitted with an output shaft sleeve (16), which is connected to the drive shaft (7) by a needle roller bearing. One end of the output shaft sleeve (16) is connected to the output shaft of the second motor (2), and both the inside of one end of the output shaft sleeve (16) and the inside of the output shaft of the second motor (2) are provided with oil seals, which are fitted on the drive shaft (7). The output shaft sleeve (16) is connected to the walking output shaft (3).

10. The pure electric tractor transmission system according to claim 9, characterized in that: The output shaft cylinder (16) is fixed with a walking output gear (17), and the walking output shaft (3) is fixed with a walking input gear (18). The walking input gear (18) meshes with the walking output gear (17).

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