Electric tractor transmission system

Abstract

The present invention discloses an electric tractor transmission system, specifically relating to new energy vehicles, comprising: a main motor, which is connected to an output shaft through a speed reducer; a speed reducer, which includes a coupled first planetary gear set and a second planetary gear set; an energy storage flywheel, which provides an auxiliary motor with rotational drive; and an auxiliary coupling mechanism, which includes a movably arranged auxiliary gear, the auxiliary gear moving as the main motor torque is insufficient. The present invention uses the energy storage flywheel to drive the energy storage flywheel to rotate and store energy when a heavy load occurs during the output of the main motor. When the first heavy-load driving is performed, the auxiliary gear will move as the main motor torque is insufficient, driving the auxiliary gear to approach the first planetary gear set and the energy storage flywheel for coupling, thereby transmitting the power of the energy storage flywheel to the first planetary gear set, so as to increase the output torque of the speed reducer and thus compensate for the torque of the main motor for loaded driving.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an electric tractor transmission system. Background Art

[0002] Electric tractors, including pure electric and hybrid power modes, work through battery and motor drive. They have the advantages of energy saving and high efficiency, low operating costs, zero emissions and low noise.

[0003] According to patent application CN113682117A, published (announced) on November 23, 2021, an electric tractor transmission system is disclosed, which relates to the technical field of direct-connected electric tractor transmission structures. The present invention includes a rear axle assembly structure, a rotating structure, a gearbox structure, a power output structure, a power source structure, and a front drive assembly structure. One side surface of the rear wheel hub is connected to one side surface of the rotating shaft. The protective shell is mounted on the outer surface of the rotating shaft. The rotor assembly is mounted on the outer surface of the rotating shaft. The first gear is mounted on the outer surface of the first transmission shaft. One side surface of the connecting block is connected to one side surface of the first gear. The connecting block is mounted on the outer surface of the first transmission shaft. The electric tractor transmission system of the present invention successfully switches the tractor's power source from the engine to the motor by providing a power supply and a motor. The electric tractor has significant advantages such as energy saving and environmental protection. The electric tractor realizes the forward and reverse functions of the tractor through the forward and reverse rotation of the motor, saving the reverse shaft, reverse gear, and shift mechanism.

[0004] In the existing technologies including the above-mentioned patents, in the transmission system of pure electric tractors, the motor and the drive shaft are directly decelerated through a reducer, and no gearbox is required for speed change in the middle. However, the work of the tractor includes scenes requiring heavy loads such as bulldozing and plowing, and the direct drive of the motor is prone to insufficient torque, affecting normal operation. Summary of the Invention

[0005] The object of the present invention is to provide an electric tractor transmission system to solve the above problems.

[0006] In order to achieve the above object, the present invention provides the following technical solution: an electric tractor transmission system, comprising:

[0007] The main motor is connected to the output shaft through a reducer;

[0008] A speed reducer including a first planetary gear set and a second planetary gear set coupled;

[0009] an energy storage flywheel, which provides auxiliary motor drive rotation;

[0010] The auxiliary coupling mechanism includes a movably arranged auxiliary gear, which moves when the torque of the main motor is insufficient and is coupled to the first planetary gear set and the energy storage flywheel.

[0011] Preferably, after the auxiliary gear is coupled to the retaining frame on the first planetary gear set, it is continuously coupled to the rotating retaining frame.

[0012] Preferably, the main motor includes a main shaft, the first planetary gear set includes a main output shaft, the main shaft and the main output shaft are connected via a coupling, and when the torque is insufficient, the main shaft and the main output shaft are connected via the auxiliary gear.

[0013] Preferably, the energy storage flywheel is provided with racks in a circular array and intermittently coupled with the auxiliary gear.

[0014] Preferably, a coupling plate is provided on the auxiliary shaft of the auxiliary motor, the energy storage flywheel is coupled to the drive wheel ring gear, and the coupling plate is coupled to the elastic limiting plate in the drive wheel ring gear.

[0015] Preferably, it further includes a centrifugal impeller provided on the energy storage flywheel, which is assembled in an air guide cover, and the air outlet of the air guide cover is respectively directed towards the first planetary gear set and the second planetary gear set.

[0016] Preferably, an auxiliary gear ring is provided on the retaining frame, a retention groove is provided on the tooth side of the auxiliary gear ring, and an elastic retention buckle that is engaged with the retention groove is provided on the tooth side of the auxiliary gear.

[0017] Preferably, the main shaft has a flip rod in a circumferential array, and also includes a synchronous belt and a cam for driving the auxiliary gear to move; when the torque is insufficient, the flip rod flips to couple the synchronous belt and drive the cam to rotate and push against the auxiliary gear.

[0018] Preferably, the plurality of flip rods are rotatably connected to the reference ring, and the first ends of the plurality of flip rods are clamped with elastic rings.

[0019] Preferably, an air inlet connected to the air outlet of the wind guide cover is provided at the top center of the retaining frame in the first planetary gear set, and a helical planetary gear coupled to the main motor is rotatably connected in the retaining frame, and an air outlet groove is provided on the side of the retaining frame.

[0020] In the above technical solution, the present invention provides an electric tractor transmission system, which has the following beneficial effects: through the energy storage flywheel, when a heavy load occurs during the output of the main motor, the energy storage flywheel is driven by the auxiliary motor to rotate and store energy, and then when the first heavy-load driving is carried out, the auxiliary gear will move as the torque of the main motor is insufficient, driving the auxiliary gear to approach the first planetary gear set and the energy storage flywheel for coupling, thereby transmitting the power of the energy storage flywheel to the first planetary gear set, so as to increase the output torque of the reducer and compensate for the torque of the main motor for load driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 An overall schematic diagram provided for an embodiment of the present invention;

[0023] Figure 2 An exploded diagram of a first planetary gear set and a main engine shaft provided in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A in the middle is an enlarged schematic diagram;

[0025] Figure 4 A schematic diagram of an exploded structure of a cooling portion provided by an embodiment of the present invention;

[0026] Figure 5 An exploded diagram of the energy storage flywheel and auxiliary motor structure provided in an embodiment of the present invention;

[0027] Figure 6 for Figure 5 The enlarged schematic diagram of point B in the middle;

[0028] Figure 7 A schematic diagram of a retainer provided in an embodiment of the present invention;

[0029] Figure 8 An exploded schematic diagram of the auxiliary coupling mechanism provided in an embodiment of the present invention;

[0030] Figure 9 A schematic diagram of the structure of a second planetary gear set and an auxiliary coupling mechanism provided in an embodiment of the present invention;

[0031] Figure 10 for Figure 9 Enlarged schematic diagram at point C in the middle;

[0032] Figure 11A schematic cross-sectional view of a first planetary gear set and a main engine shaft provided in an embodiment of the present invention;

[0033] Figure 12 for Figure 11 The enlarged schematic diagram of point D in the middle;

[0034] Figure 13 An exploded diagram of a second planetary gear set provided by an embodiment of the present invention;

[0035] Figure 14 for Figure 8 Enlarged schematic diagram at point E in the middle.

[0036] Description of reference numerals:

[0037] 1. Main motor; 11. Main output shaft; 111. Internal coupling gear; 12. Main shaft; 121. Slideway; 13. Auxiliary motor; 131. Auxiliary shaft; 132. Clamping slot; 14. Coupling plate; 15. Drive gear ring; 151. Elastic limiting plate; 2. First planetary gear set; 21. Cage; 210. Auxiliary gear ring; 2101. Retention groove; 211. Exhaust groove; 212. Air inlet; 22. First helical gear ring; 23. Helical planetary gear; 3. Second planetary gear set; 31. Second helical gear ring; 32. First output shaft; 33. Second output shaft; 331. First spur gear; 322. Second spur gear; 4. Energy storage flywheel; 40. Counterweight; 41. Fixed tooth groove; 42. Rack; 43. Drive wheel gear; 5. Auxiliary coupling mechanism; 51. Outer sleeve; 52. Auxiliary gear; 521. Rotating slide shaft; 522. Elastic retention buckle; 523. Spring; 524. Push plate; 53. Cam; 54. Belt drive gear; 541. Synchronous belt; 55. Turning rod; 56. Reference ring; 561. Elastic ring; 57. Cone head stud; 571. Screw sleeve; 61. Cover plate; 62. Centrifugal impeller; 611. First cooling channel; 612. Second cooling channel; 63. Inner partition air intake hood; 64. Cooling hood. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] like Figure 1-14 As shown, an electric tractor transmission system includes:

[0040] Main motor 1, which is connected to the output shaft through a reducer;

[0041] A speed reducer including a first planetary gear set 2 and a second planetary gear set 3 coupled;

[0042] Energy storage flywheel 4, which provides auxiliary motor 13 with driving rotation;

[0043] The auxiliary coupling mechanism 5 includes a movable auxiliary gear 52 . The auxiliary gear 52 moves when the torque of the main motor 1 is insufficient, and is coupled to the first planetary gear set 2 and the energy storage flywheel 4 .

[0044] Specifically, the first planetary gear set 2 is connected to the main motor 1, and the output shaft is connected to the second planetary gear set 3, so that the force output by the main motor 1 is decelerated by the first planetary gear set 2 and the second planetary gear set 3 in sequence and then transmitted to the output shaft to drive the tires to move.

[0045] In the above technical solution, through the energy storage flywheel 4, when a heavy load occurs during the output of the main motor 1, the energy storage flywheel 4 is driven by the auxiliary motor 13 to rotate and store energy, and then when the first heavy-load driving is carried out, the auxiliary gear 52 will move as the torque of the main motor 1 is insufficient, driving the auxiliary gear 52 to couple close to the first planetary gear set 2 and the energy storage flywheel 4, thereby transmitting the power of the energy storage flywheel 4 to the first planetary gear set 2, so as to increase the output torque of the reducer and compensate for the torque of the main motor 1 for load driving.

[0046] Furthermore, the second planetary gear set 3 includes a second helical gear ring 31, and the output shaft includes a first output shaft 32 and a second output shaft 33. The first output shaft 32 and the second output shaft 33 are respectively provided with spur gears, and the spur gears are arranged in the second helical gear ring 31. The second helical gear ring 31 is rotatably connected with a second spur gear 322 and a first spur gear 331 that are coupled to each other. The second spur gear 322 is coupled to the first output shaft 32, and the first spur gear 331 is coupled to the second output shaft 33.

[0047] As an embodiment provided by the present invention, the first planetary gear set 2 includes a retaining frame 21, which serves as a sun frame for the helical planetary gear 23 in the first planetary gear set 2. When the torque of the main motor 1 is insufficient, the auxiliary gear 52 will move and couple with the retaining frame 21. After coupling, the auxiliary gear 52 will continue to be coupled to the rotating retaining frame 21 as the retaining frame 21 continues to rotate, and will not separate. It will only disengage after the retaining frame 21 rotates slowly, so as to maintain the smooth drive of the energy storage flywheel 4 during heavy-load driving.

[0048] Furthermore, a first helical gear ring 22 is provided on the retaining frame 21 , and the first helical gear ring 22 is coupled to the second helical gear ring 31 .

[0049] As an embodiment provided by the present invention, the main motor 1 includes a main shaft 12, and the first planetary gear set 2 includes a main output shaft 11. The main shaft 12 and the main output shaft 11 are connected by a coupling. The transmission connection of the coupling is a transmission connection that keeps the main shaft 12 and the main output shaft 11 rotating synchronously. When the torque is insufficient, the main shaft 12 is connected to the auxiliary gear 52. The transmission connection is that the rotation of the main shaft 12 drives the auxiliary gear 52 to slide, so that the auxiliary gear 52 couples the energy storage flywheel 4 and the retaining frame 21 to increase the output force.

[0050] As an embodiment provided by the present invention, a plurality of counterweights 40 are arranged in a circular array on the energy storage flywheel 4 to increase the inertia of the energy storage flywheel 4 during rotation. To cope with heavy load scenarios, the energy storage flywheel 4 is provided with fixed tooth grooves 41 in a circular array, and the fixed tooth grooves 41 are provided with racks 42 intermittently coupled with the auxiliary gear 52. When the auxiliary gear 52 couples the energy storage flywheel 4 and the retaining frame 21 due to insufficient torque, the auxiliary gear 52 is intermittently coupled to the energy storage flywheel 4 through the rack 42, and the auxiliary gear 52 is coupled at a fixed frequency to overcome the heavy load points that need to be overcome during the heavy load process (heavy load points such as stones encountered when plowing and bulldozing, such as uphill when pulling heavy objects) while maintaining the rotation speed of the energy storage flywheel 4, thereby facilitating the auxiliary motor 13 to continuously drive the energy storage flywheel 4 and reduce the load of the auxiliary motor 13.

[0051] As an embodiment provided by the present invention, a slot 132 is provided on the auxiliary shaft 131 of the auxiliary motor 13, and a coupling plate 14 is fixedly connected to the slot 132 by interference fit. A drive wheel gear 43 is provided on the energy storage flywheel 4, and the drive wheel gear 43 is coupled to the drive wheel ring gear 15. An elastic limiting plate 151 is provided in the drive wheel ring gear 15, and the coupling plate 14 is coupled to the elastic limiting plate 151. When encountering heavy load conditions, the auxiliary motor 13 is driven to rotate. At this time, the auxiliary shaft 131 rotates to drive the coupling plate 14 to couple with the elastic limiting plate 151. However, in the initial stage of driving, due to the large weight of the energy storage flywheel 4, the elastic limiting plate 151 will bend to protect the auxiliary motor 13, and the rotation speed of the energy storage flywheel 4 is slowly driven to continuously increase until the rotation speed reaches the specified rotation speed of the auxiliary shaft 131 to complete the driving of the energy storage flywheel 4.

[0052] As an embodiment provided by the present invention, it includes a centrifugal impeller 62 arranged on the energy storage flywheel 4, which is assembled in the air guide cover. The air guide cover includes an inner partition air suction cover 63 and a cover plate 61. The cover plate 61 covers the energy storage flywheel 4. The inner partition air suction cover 63 extends into the cover plate 61 and covers the centrifugal impeller 62. The inner partition air suction cover 63 and the cover plate 61 are fixedly connected. The cover plate 61 is symmetrically provided with air outlets, and the air outlets are respectively fixedly connected to a first cooling channel 611 connected to the first planetary gear set 2 and a second cooling channel 612 connected to the second planetary gear set 3. The second helical gear ring 31 is covered with a cooling cover 64, and the second cooling channel 612 is fixedly connected to the cooling cover 64. When the energy storage flywheel 4 rotates, it drives the centrifugal impeller 62 to rotate and generate negative pressure to suck the airflow in the inner partition air suction cover 63 into the interior of the energy storage flywheel 4, so as to transport the airflow along the first cooling channel 611 and the second cooling channel 612 to cool the first planetary gear set 2 and the second planetary gear set 3.

[0053] The cooling cover 64, the inner partition air suction cover 63 and the cover plate 61 are all fixed on the casing, which is an outer shell component.

[0054] As an embodiment provided by the present invention, an auxiliary gear ring 210 is provided on the retaining frame 21, and the auxiliary gear ring 210 is used to couple with the auxiliary gear 52 to transmit power. A retention groove 2101 is provided on both tooth sides of the auxiliary gear ring 210, and an elastic retention buckle 522 is provided on both tooth sides of the auxiliary gear 52 to be clamped on the retention groove 2101. When the tooth side of the auxiliary gear 52 and the tooth side of the auxiliary gear ring 210 are coupled, there will be a step of fitting and separation. When fitting, the elastic retention buckle 522 will The auxiliary gear 52 and the auxiliary gear ring 210 are compressed in the retention groove 2101. When the auxiliary gear ring 210 is separated, the elastic retention buckle 522 will rebound with the separation to be retained in the retention groove 2101. Then, the elastic retention buckle 522 on the adjacent tooth side will be stuck in the retention groove 2101 with the high rotation speed of the auxiliary gear ring 210 to achieve continuous coupling between the auxiliary gear 52 and the auxiliary gear ring 210. After the auxiliary gear ring 210 (that is, the retainer 21) slows down, the elastic retention buckle 522 on one side will have a gap during the rotation and separate from the auxiliary gear ring 210.

[0055] Furthermore, it also includes an outer sleeve 51 arranged on the casing, and a sliding shaft 521 is slidably connected to the outer sleeve 51, and the auxiliary gear 52 is rotatably connected to the sliding shaft 521. The outer sleeve 51 is fixedly connected to a push plate 524 through a spring 523, and the push plate 524 pushes the auxiliary gear 52 away from the auxiliary gear ring 210, so that after the auxiliary gear ring 210 slows down, the push plate 524 pushes the auxiliary gear 52 against the auxiliary gear 52 to cause the auxiliary gear 52 and the auxiliary gear ring 210 to separate.

[0056] As an embodiment provided by the present invention, a turning rod 55 is arranged in a circumferential array within the main shaft 12. The main shaft 12 is provided with two sets of slide grooves 121 corresponding to the ends of the turning rod 55 in a circumferential array. The main shaft 12 also includes a synchronous belt 541 and a cam 53 for driving the auxiliary gear 52 to move. The cam 53 is rotatably connected to the outer sleeve 51 via a rotating shaft. An inner rotating shaft is provided within the belt drive gear 54, and a synchronous belt 541 is sleeved between the inner rotating shaft and the rotating shaft.

[0057] When the torque is insufficient, the flip rod 55 will flip to extend out of the slide slot 121 and couple to the belt drive gear 54, thereby driving the synchronous belt 541 to rotate, causing the cam 53 to rotate and push against the auxiliary gear 52, overcoming the pushing force of the spring 523, so that the auxiliary gear 52 and the auxiliary gear ring 210 are coupled.

[0058] Furthermore, a plurality of flip rods 55 are rotatably connected to a reference ring 56, which is provided in the main shaft 12. The first ends of the plurality of flip rods 55 (the end close to the main output shaft 11 is the first end) are clamped on the elastic ring 561. A screw sleeve 571 is provided in the main shaft 12. A cone head stud 57 is threadedly connected to the screw sleeve 571. The cone head stud 57 is used to open the inner wall of the elastic ring 561 to limit the elasticity of the elastic ring 561 and adjust the force of driving the flip rod 55 to flip. The cone head stud 57 opens the elastic ring 561. 61 is pulled when rotating, so it is not easy to loosen. The inner wall of one end of the main output shaft 11 facing the flip rod 55 is provided with an inner coupling tooth 111 in a circumferential array. The first end of the flip rod 55 extends out of the slide groove 121 and fits with the inner coupling tooth 111 (that is, it is a coupling for transmitting power), and the fitting part is an inclined surface. When the torque is insufficient, the first end of the flip rod 55 will be squeezed along the inner coupling tooth 111 by the inclined surface to overcome the pushing force of the elastic ring 561 and flip, so that the other end of the flip rod 55 extends out of the slide groove 121 and is coupled to the belt drive gear 54.

[0059] As the best embodiment provided by the present invention, the top of the retainer 21 in the first planetary gear set 2 (with Figure 4 For reference, the top is the left end face) the center is provided with an air inlet 212 connected to the first cooling channel 611, the inside of the holder 21 is rotatably connected to the helical planetary gear 23 coupled to the main motor 1, the side of the holder 21 (with Figure 4 For reference, the side surface is an annular surface) and an air outlet groove 211 is opened. When the air guide cover supplies air to the air inlet 212, the airflow enters the retaining frame 21 and is located between the three helical planetary gears 23. When the helical planetary gears 23 are coupled, the inclined teeth will leave a channel. The airflow cools the three helical planetary gears 23 and the main output shaft 11 along the channel and flows out from the air outlet groove 211, achieving targeted cooling.

[0060] When not in use in heavy-load situations, the main motor 1 drives the first planetary gear set 2 and the second planetary gear set 3 to transmit the output shaft. When in use in heavy-load situations, the auxiliary motor 13 is started in advance, and the auxiliary shaft 131 is rotated to drive the coupling plate 14 to couple with the elastic limiting plate 151, so as to slowly drive the energy storage flywheel 4 to increase its rotation speed, and then form the vehicle's movement. In the pre-heavy-load situation, the first end of the flip rod 55 will flip as the inclined surface is squeezed along the inner coupling tooth 111 to overcome the pushing force of the elastic ring 561, so that the other end of the flip rod 55 extends out of the slide groove 121 and couples to the belt drive gear 54 to belt. The dynamic synchronous belt 541 rotates, causing the cam 53 to rotate and push against the auxiliary gear 52, overcoming the pushing force of the spring 523, so that the auxiliary gear 52 and the auxiliary gear ring 210 are coupled. At this time, the elastic retention buckle 522 will limit the rapid rotation of the auxiliary gear ring 210 and the continuous coupling of the auxiliary gear 52. At the same time, the energy storage flywheel 4 rotates and is intermittently coupled with the auxiliary gear 52 through the rack 42 to overcome the heavy load point that needs to be overcome during the heavy load process. After the use in the heavy load situation is over, the auxiliary gear ring 210 will slow down and the elastic retention buckle 522 on one side will appear a gap during the rotation and separate from the auxiliary gear ring 210, prompting the auxiliary gear 52 to separate from the auxiliary gear ring 210.

[0061] When the energy storage flywheel 4 rotates, it drives the centrifugal impeller 62 to rotate and generate negative pressure to suck the air flow in the inner air suction cover 63 into the interior of the energy storage flywheel 4, so as to transport the air flow along the first cooling channel 611 and the second cooling channel 612. The first cooling channel 611 guides the air flow into the retaining frame 21 and is located between the three helical planetary gears 23. When the helical planetary gears 23 are coupled, the air flow cools the three helical planetary gears 23 and the main output shaft 11 along the channel. The second cooling channel 612 transports the air into the cooling cover 64 to cool the second planetary gear set 3.

[0062] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. An electric tractor transmission system, characterized in that: include: The main motor is connected to the output shaft through a reducer; A speed reducer including a first planetary gear set and a second planetary gear set coupled; an energy storage flywheel, which provides auxiliary motor drive rotation; An auxiliary coupling mechanism, comprising a movably arranged auxiliary gear, wherein the auxiliary gear moves when the torque of the main motor is insufficient, and is coupled to the first planetary gear set and the energy storage flywheel; After the auxiliary gear is coupled to the retainer on the first planetary gear set, it is continuously coupled to the rotating retainer; The main motor includes a main shaft, and the first planetary gear set includes a main output shaft. The main shaft and the main output shaft are connected to each other through a coupling, and when the torque is insufficient, the main shaft and the main output shaft are connected to each other through a coupling. The retaining frame is provided with an auxiliary gear ring, a retention groove is provided on the tooth side of the auxiliary gear ring, and an elastic retention buckle is provided on the tooth side of the auxiliary gear to be clamped on the retention groove; The main shaft has a circumferential array of flip rods, and also includes a synchronous belt and a cam for driving the auxiliary gear to move; when the torque is insufficient, the flip rod flips to couple the synchronous belt and drive the cam to rotate and push against the auxiliary gear.

2. The electric tractor transmission system according to claim 1, characterized in that: The energy storage flywheel is provided with racks in a circumferential array and intermittently coupled with the auxiliary gear.

3. The electric tractor transmission system according to claim 1, characterized in that: A coupling plate is provided on the auxiliary shaft of the auxiliary motor, the energy storage flywheel is coupled to the drive wheel ring gear, and the coupling plate is coupled to the elastic limiting plate in the drive wheel ring gear.

4. The electric tractor transmission system according to claim 1, characterized in that: It also includes a centrifugal impeller arranged on the energy storage flywheel, which is assembled in an air scoop, and the air outlet of the air scoop is respectively directed towards the first planetary gear set and the second planetary gear set.

5. The electric tractor transmission system according to claim 1, characterized in that: The plurality of flip rods are rotatably connected to the reference ring, and the first ends of the plurality of flip rods are clamped with elastic rings.

6. The electric tractor transmission system according to claim 4, characterized in that: An air inlet connected to the air outlet of the wind guide cover is provided at the top center of the retaining frame in the first planetary gear set. A helical planetary gear coupled to the main motor is rotatably connected in the retaining frame, and an air outlet groove is provided on the side of the retaining frame.

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