Gear shift structure and tractor

Abstract

The utility model provides a gear shifting structure and tractor, include: gear shifting weld, operating handle, flexible axle, pull rod subassembly, select gear shaft, select gear shift head, select gear rocker, first shift fork axle, second shift fork axle, operating handle is along select gear shaft axial movement through flexible axle, select gear rocker drive select gear shift head, realize select gear shaft and first shift fork axle or second shift fork axle's connection, operating handle is through pull rod subassembly drive select gear shaft rotation, first shift fork axle or second shift fork axle axial movement, realize gear shifting operation, the utility model discloses through the cooperation of flexible axle and pull rod subassembly realizes the control to single operation weld to two shift fork axle, utilizes the control weld axial space, adopts axial pull select gear, saves tractor PTO operation horizontal operation space, while satisfying 3 gear's switching, greatly shortens the axial dimension of gear shifting mechanism, and then shortens the whole machine front and back length, reduces gear shifting total stroke simultaneously, improves the convenience of control.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery transmission technology, and in particular to a shifting structure and a tractor. Background Technology

[0002] In existing technologies, most tractor power take-off (PTO) devices are two-speed structures. With the continuous development of agricultural modernization in my country, farmers' demands for the functionality of machinery are constantly increasing, and the two-speed structure cannot meet the operational needs of users under different working conditions. In most cases, three-speed transmission shifting structures lack gear selection functionality. Switching between three or more gears requires more neutral positions, thus requiring more axial space, increasing the overall length of the vehicle, and raising manufacturing costs. Therefore, it is necessary to provide a shifting structure and tractor that overcomes the aforementioned shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a gear shifting structure and a tractor.

[0004] According to one aspect of the present invention, a shifting structure and a tractor are provided, comprising:

[0005] The shift welding includes a rotating part that can rotate along the mounting point and a sleeve part disposed above the rotating part;

[0006] An operating handle is inserted into the sleeve portion and can move axially along the sleeve portion;

[0007] A flexible shaft, one end of which passes through the shift welding point and is connected to the operating handle;

[0008] A pull rod assembly, one end of which is connected to a rotating part and rotates synchronously;

[0009] A gear selector shaft, one end of which is connected to the other end of the pull rod assembly, and the operating handle drives the gear selector shaft to rotate via the pull rod assembly;

[0010] A gear selector is sleeved on the gear selector shaft, and the gear selector can move along the axial direction of the gear selector shaft and rotate integrally with the gear selector shaft;

[0011] A gear selector rocker arm, one end of which is connected to the other end of the flexible shaft, and the other end of which is connected to the gear selector lever; the operating handle drives the gear selector lever to move axially along the gear selector shaft via the flexible shaft and the gear selector rocker arm;

[0012] A first shift fork shaft is provided with a first slot and a first shift fork. The first slot cooperates with the gear selection head, and the first shift fork is fixedly connected to the first shift fork shaft. The gear selection head is selectively engaged in the first slot, and the gear selection head drives the first shift fork shaft to move axially along the first shift fork shaft.

[0013] The second shift fork shaft has a second slot and a second shift fork. The second slot cooperates with the gear selector head, and the second shift fork is fixedly connected to the second shift fork shaft. The gear selector head is selectively engaged in the second slot, and the gear selector head drives the second shift fork shaft to move axially.

[0014] An input terminal assembly includes an input shaft, a first input gear, a second input gear, and a third input gear, wherein the input shaft drives the first input gear, the second input gear, and the third input gear to rotate synchronously.

[0015] An output end assembly, the output end assembly including an output shaft, a first output gear loosely fitted on the output shaft and meshing with a first input gear, a second output gear loosely fitted on the output shaft and meshing with a second input gear, and a third output gear loosely fitted on the output shaft and meshing with a third input gear;

[0016] A first meshing assembly is disposed on one side of the first output gear and controlled by the first shift fork, thereby enabling the connection or disconnection of the first output gear and the input shaft.

[0017] The second engagement assembly is located between the second output gear and the third output gear and is controlled by the second shift fork, thereby enabling the connection or disconnection of the second output gear and the input shaft, and the third output gear and the input shaft.

[0018] Preferably, it further includes a mounting base located in the tractor cab and a rotating shaft located on the mounting base, wherein the shift welding is rotatably mounted on the rotating shaft via a rotating part.

[0019] Preferably, the sleeve portion is provided with an axially shaped hole, and an anti-rotation pin is provided at the lower part of the operating handle, with both ends of the anti-rotation pin located inside the shaped hole.

[0020] Preferably, the pull rod assembly includes a first rocker arm that rotates integrally with the rotating part, a second rocker arm that is disposed on the gear selection shaft and rotates integrally with it, and a pull rod that connects the first rocker arm and the second rocker arm.

[0021] Preferably, an elastic element is sleeved on the gear selection shaft, and the elastic element is located on the side of the gear selection lever away from the gear selection rocker arm to keep the gear selection lever moving towards the gear selection rocker arm side.

[0022] Preferably, the first meshing assembly includes a first connecting seat, a first engaging portion, and a first connecting sleeve. The first connecting seat rotates synchronously with the output shaft. The first engaging portion is connected to the first output gear and is disposed adjacent to the first connecting seat. The first connecting sleeve is connected to the first shift fork.

[0023] The second engagement assembly includes a second connecting seat, a second engaging portion, a third engaging portion, and a second connecting sleeve. The second connecting seat is located between the second engaging portion and the third engaging portion and rotates synchronously with the output shaft. The second engaging portion is connected to the second output gear and is disposed adjacent to the second connecting seat. The third engaging portion is connected to the third output gear and is disposed adjacent to the second connecting seat. The second connecting sleeve is connected to the second shift fork.

[0024] Preferably, a first bushing is provided between the first output gear and the output shaft, a second bushing is provided between the second output gear and the output shaft, and a third bushing is provided between the third output gear and the output shaft. A lubricating oil passage is provided inside the output shaft, and the lubricating oil passage is connected to the first bushing, the second bushing and the third bushing respectively through branch oil passages.

[0025] Preferably, the diameter of the first input gear is larger than that of the second input gear, the diameter of the second input gear is larger than that of the third input gear, the second input gear is located between the first input gear and the third input gear, the diameter of the first output gear is smaller than that of the second output gear, the diameter of the second output gear is smaller than that of the third output gear, the second output gear is located between the first output gear and the third output gear, and the diameter of the third input gear is smaller than that of the first output gear.

[0026] Preferably, both ends of the input shaft and the output shaft are provided with bearings. The output shaft includes a main body and an output part. The main body includes a boss extending along the axial direction. The output part includes a countersunk hole corresponding to the boss. The main body and the output part are fixed by bolts.

[0027] According to another aspect of the present invention, a tractor is provided, including the aforementioned shifting mechanism.

[0028] Compared with the prior art, the shifting structure and tractor provided by this utility model have the following beneficial effects:

[0029] This invention achieves control of two shift fork shafts by a single operating welded together through the cooperation of a flexible shaft and a tie rod assembly. By utilizing the axial space of the operating welded together, the axial lifting gear selection is adopted, saving the lateral operating space of the tractor PTO operation. While satisfying the switching of three gears, it greatly shortens the axial dimension of the shifting mechanism, thereby shortening the front and rear length of the whole machine, reducing the total shifting stroke, and improving the ease of operation. Attached Figure Description

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] Figure 1 This is one of the structural schematic diagrams of the gear shifting structure in this utility model;

[0032] Figure 2 This is a schematic diagram of the welding operation in this utility model;

[0033] Figure 3 This is the second schematic diagram of the shifting structure in this utility model;

[0034] Figure 4 This is one of the structural schematic diagrams of the selector shaft in this utility model;

[0035] Figure 5 This is the second schematic diagram of the structure of the selector shaft in this utility model;

[0036] Figure 6 This is one of the structural schematic diagrams of the input terminal component and the output terminal component in this utility model;

[0037] Figure 7 This is the second schematic diagram of the input and output components of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Operating unit; 11. Gear shift welding; 111. Rotating part; 112. Sleeve part; 113. Waist-shaped hole; 12. Operating handle; 121. Anti-rotation pin; 13. Mounting base;

[0040] 2. Flexible shaft;

[0041] 3. Pull rod assembly; 31. First rocker arm; 32. Second rocker arm; 33. Pull rod;

[0042] 4. Gear selection unit; 41. Gear selection rocker arm; 42. Gear selection shaft; 43. Gear selection dial; 44. Elastic element;

[0043] 5. First shift fork shaft; 51. First slot; 52. First shift fork;

[0044] 6. Second shift fork shaft; 61. Second slot; 62. Second shift fork;

[0045] 7. Input end assembly; 71. Input shaft; 72. First input gear; 73. Second input gear; 74. Third input gear;

[0046] 8. Output end assembly; 81. Output shaft; 82. First output gear; 83. Second output gear; 84. Third output gear; 85. First meshing assembly; 86. Second meshing assembly; 851. First connecting seat; 852. First connecting part; 853. First connecting sleeve; 861. Second connecting seat; 862. Second connecting part; 863. Third connecting part; 864. Second connecting sleeve; 821. First bushing; 831. Second bushing; 841. Third bushing; 811. Main body; 812. Output part. Detailed Implementation

[0047] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0049] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0050] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0052] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0053] See appendix Figures 1 to 7 This embodiment discloses a shifting structure applied in the field of tractors. The shifting structure is a three-speed PTO for tractors. The shifting structure includes: an operating unit 1, a flexible shaft 2, a lever assembly 3, a gear selection unit 4, a first shift fork shaft 5, a second shift fork shaft 6, an input end assembly 7, and an output end assembly 8.

[0054] See appendix Figures 1 to 3 The shift welding 11 includes a rotating part 111 that can rotate along the mounting point and a sleeve part 112 disposed above the rotating part 111. The operating handle 12 is inserted into the sleeve part 112 and can move axially along the sleeve part 112. One end of the flexible shaft 2 passes through the shift welding 11 and is connected to the operating handle 12. One end of the pull rod assembly 3 is connected to the rotating part 111 and rotates synchronously. One end of the gear selection shaft 42 is connected to the other end of the pull rod assembly 3. The operating handle 12 drives the gear selection shaft 42 to rotate via the pull rod assembly 3.

[0055] See appendix Figure 4 One end of the gear selection shaft 42 is connected to the other end of the pull rod assembly 3. The operating handle 12 drives the gear selection shaft 42 to rotate via the pull rod assembly 3. The gear selection dial 43 is sleeved on the gear selection shaft 42. The gear selection dial 43 moves axially along the gear selection shaft 42 and can rotate integrally with the gear selection shaft 42. One end of the gear selection rocker arm 41 is connected to the other end of the flexible shaft 2. The other end of the gear selection rocker arm 41 is connected to the gear selection dial 43. The operating handle 12 drives the gear selection dial 43 to move axially along the gear selection shaft 42 via the flexible shaft 2 and the gear selection rocker arm 41.

[0056] A mounting base 13 is provided on the mudguard of the tractor cab, and a rotating shaft is provided on the mounting base 13. The shift welding 11 is rotatably mounted on the rotating shaft through the rotating part 111. The user is located in the cab and realizes control of the shifting structure.

[0057] See appendix Figure 2The sleeve portion 112 is provided with an axially shaped hole 113, and an anti-rotation pin 121 is provided at the lower part of the operating handle 12, with both ends of the anti-rotation pin 121 located inside the axially shaped hole 113. When the user pulls the shift weld 11 axially, it can play a limiting role and prevent the shift weld 11 from falling off.

[0058] See appendix Figure 2 , 4 The pull rod assembly 3 includes a first rocker arm 31 that rotates integrally with the rotating part 111, a second rocker arm that is mounted on the gear selection shaft 42 and rotates integrally with it, and a pull rod 33 that connects the first rocker arm 31 and the second rocker arm 32. The pull rod assembly 3 drives the gear selection shaft 42 to move axially.

[0059] See appendix Figure 4 An elastic element 44 is sleeved on the gear selection shaft 42. The elastic element 44 is located on the side of the gear selection dial 43 away from the gear selection rocker arm 41, which keeps the gear selection dial 43 moving toward the gear selection rocker arm 41.

[0060] When the user pulls the shift welding 11 axially along the shift welding 11, it drives the pull cable inside the flexible shaft 2 to move, thereby moving the shift selector head 43 axially. When the user rotates the shift welding 11 along the rotating part 111, it drives the pull rod assembly 3 to move, thereby moving the shift selector shaft 42 axially. When the lifting and rotating actions are coordinated, the shift structure is controlled to meet the user's different gear requirements.

[0061] See appendix Figure 5 The first shift fork shaft 5 is provided with a first slot 51 and a first shift fork 52. The first slot 51 cooperates with the gear selector head 43, and the first shift fork 52 is fixedly connected to the first shift fork shaft 5. The second shift fork shaft 6 is provided with a second slot 61 and a second shift fork 62. The second slot 61 cooperates with the gear selector head 43, and the second shift fork 62 is fixedly connected to the second shift fork shaft 6.

[0062] In neutral, the first slot 51 and the second slot 61 are flush, and the gear selector 43 can move back and forth between the first slot 51 and the second slot 61 to connect the gear selector shaft 42 to the first shift fork 52 or the second shift fork 62. In non-neutral, the first slot 51 and the second slot 61 are misaligned, and the gear selector 43 cannot move back and forth between the first slot 51 and the second slot 61.

[0063] The gear selector 43 is selectively engaged in the first slot 51, and the gear selector 43 drives the first shift fork shaft 5 to move axially along the first shift fork shaft 5. The gear selector 43 is selectively engaged in the second slot 61, and the gear selector 43 drives the second shift fork shaft 6 to move axially.

[0064] See appendix Figure 6 The input end assembly 7 includes an input shaft 71, a first input gear 72, a second input gear 73, and a third input gear 74. The input shaft 71 drives the first input gear 72, the second input gear 73, and the third input gear 74 to rotate synchronously. The output end assembly 8 includes an output shaft 81, a first output gear 82 loosely fitted on the output shaft 81 and meshing with the first input gear 72, a second output gear 83 loosely fitted on the output shaft 81 and meshing with the second input gear 73, and a third output gear 84 loosely fitted on the output shaft 81 and meshing with the third input gear 74.

[0065] The first engagement assembly 85 is disposed on one side of the first output gear 82 and controlled by the first shift fork 52, realizing the connection or disconnection of the first output gear 82 and the input shaft 71. The first engagement assembly 85 includes a first connecting seat 851, a first engaging portion 852 and a first connecting sleeve 853. The first connecting seat 851 rotates synchronously with the output shaft 81. The first engaging portion 852 is connected to the first output gear 82 and is disposed adjacent to the first connecting seat 851. The first connecting sleeve 853 is connected to the first shift fork 52.

[0066] The second engagement assembly 86 is disposed between the second output gear 83 and the third output gear 84 and is controlled by the second shift fork 62, realizing the connection or disconnection of the second output gear 83 and the input shaft 71, and the third output gear 84 and the input shaft 71. The second engagement assembly 86 includes a second connecting seat 861, a second engaging portion 862, a third engaging portion 863, and a second connecting sleeve 864. The second connecting seat 861 is located between the second engaging portion 862 and the third engaging portion 863 and rotates synchronously with the output shaft 81. The second engaging portion 862 is connected to the second output gear 83 and is disposed adjacent to the second connecting seat 861. The third engaging portion 863 is connected to the third output gear 84 and is disposed adjacent to the second connecting seat 861. The second connecting sleeve 864 is connected to the second shift fork 62.

[0067] The diameter of the first input gear 72 is larger than that of the second input gear 73, the diameter of the second input gear 73 is larger than that of the third input gear 74, and the second input gear 73 is located between the first input gear 72 and the third input gear 74. The diameter of the first output gear 82 is smaller than that of the second output gear 83, the diameter of the second output gear 83 is smaller than that of the third output gear 84, and the second output gear 83 is located between the first output gear 82 and the third output gear 84. The diameter of the third input gear 74 is smaller than that of the first output gear 82.

[0068] In neutral, the first slot 51 and the second slot 61 are flush, and the first dial can move back and forth between the first slot 51 and the second slot 61. The first connecting sleeve 853 is located radially outside the first connecting seat 851, and the second connecting sleeve 864 is located radially outside the second connecting seat 861. The output shaft 81 and the input shaft 71 are not connected by transmission.

[0069] In first gear, pulling up the operating handle 12 causes the gear selector 43 to engage with the first slot 51, connecting the shift shaft and the first shift fork shaft 5. The first shift fork 52 pushes the first connecting sleeve 853, drivingly connecting the first joint 852 and the first connecting seat 851. The second connecting sleeve 864 is located radially outside the second connecting seat 861. Power from the input shaft 71 is transmitted sequentially through the first input gear 72, the first output gear 82, the first connecting sleeve 853, and the first connecting seat 851 to the output shaft 81.

[0070] In the second gear position, pulling up the operating handle 12 causes the gear selector 43 to engage with the second slot 61, connecting the shift shaft and the second shift fork shaft 6. The first connecting sleeve 853 is located radially outside the first connecting part 852, and the second connecting sleeve 864 drivesly connects the second connecting part 862 and the second connecting seat 861. The power from the input shaft 71 is transmitted to the output shaft 81 sequentially through the second input gear 73, the second output gear 83, the second connecting sleeve 864, and the second connecting seat 861.

[0071] In the third gear position, pulling up the operating handle 12 causes the gear selector 43 to engage with the second slot 61, connecting the shift shaft and the second shift fork shaft 6. The first connecting sleeve 853 is located radially outside the first connecting seat 851. The second connecting sleeve 864 drivesly connects the third joint 863 and the second connecting seat 861. The power from the input shaft 71 is transmitted to the output shaft 81 sequentially through the third input gear 74, the third output gear 84, the second connecting sleeve 864, and the second connecting seat 861.

[0072] See appendix Figure 7 A first bushing 821 is provided between the first output gear 82 and the output shaft 81, a second bushing 831 is provided between the second output gear 83 and the output shaft 81, and a third bushing 841 is provided between the third output gear 84 and the output shaft 81. A lubricating oil passage is provided inside the output shaft 81, and the lubricating oil passage is connected to the first bushing 821, the second bushing 831 and the third bushing 841 respectively through branch oil passages.

[0073] See appendix Figure 7Both ends of the input shaft 71 and the output shaft 81 are provided with bearings. The output shaft 81 includes a main body 811 and an output part 812. The main body 811 includes a boss extending along the axial direction. The output part 812 includes a countersunk hole corresponding to the boss. The main body 811 and the output part 812 are fixed by bolts.

[0074] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A gear shifting structure, characterized in that, include: The shift welding includes a rotating part that can rotate along the mounting point and a sleeve part disposed above the rotating part; An operating handle is inserted into the sleeve portion and can move axially along the sleeve portion; A flexible shaft, one end of which passes through the shift welding point and is connected to the operating handle; A pull rod assembly, one end of which is connected to a rotating part and rotates synchronously; A gear selector shaft, one end of which is connected to the other end of the pull rod assembly, and the operating handle drives the gear selector shaft to rotate via the pull rod assembly; A gear selector is sleeved on the gear selector shaft, and the gear selector can move along the axial direction of the gear selector shaft and rotate integrally with the gear selector shaft; A gear selector rocker arm, one end of which is connected to the other end of the flexible shaft, and the other end of which is connected to the gear selector lever; the operating handle drives the gear selector lever to move axially along the gear selector shaft via the flexible shaft and the gear selector rocker arm; A first shift fork shaft is provided with a first slot and a first shift fork. The first slot cooperates with the gear selection head, and the first shift fork is fixedly connected to the first shift fork shaft. The gear selection head is selectively engaged in the first slot, and the gear selection head drives the first shift fork shaft to move axially along the first shift fork shaft. The second shift fork shaft has a second slot and a second shift fork. The second slot cooperates with the gear selector head, and the second shift fork is fixedly connected to the second shift fork shaft. The gear selector head is selectively engaged in the second slot, and the gear selector head drives the second shift fork shaft to move axially. An input terminal assembly includes an input shaft, a first input gear, a second input gear, and a third input gear, wherein the input shaft drives the first input gear, the second input gear, and the third input gear to rotate synchronously. An output end assembly, the output end assembly including an output shaft, a first output gear loosely fitted on the output shaft and meshing with a first input gear, a second output gear loosely fitted on the output shaft and meshing with a second input gear, and a third output gear loosely fitted on the output shaft and meshing with a third input gear; A first meshing assembly is disposed on one side of the first output gear and controlled by the first shift fork, thereby enabling the connection or disconnection of the first output gear and the input shaft. The second engagement assembly is located between the second output gear and the third output gear and is controlled by the second shift fork, thereby enabling the connection or disconnection of the second output gear and the input shaft, and the third output gear and the input shaft.

2. The shifting structure as described in claim 1, characterized in that, It also includes a mounting base located in the tractor cab and a rotating shaft located on the mounting base, wherein the shift welding is rotatably mounted on the rotating shaft via a rotating part.

3. The shifting structure as described in claim 2, characterized in that, The sleeve portion is provided with an axially shaped hole, and an anti-rotation pin is provided at the lower part of the operating handle, with both ends of the anti-rotation pin located inside the shaped hole.

4. The shifting structure as described in claim 1, characterized in that, The pull rod assembly includes a first rocker arm that rotates integrally with the rotating part, a second rocker arm that is mounted on the gear selection shaft and rotates integrally with it, and a pull rod that connects the first rocker arm and the second rocker arm.

5. The shifting structure as described in claim 4, characterized in that, An elastic element is sleeved on the gear selection shaft. The elastic element is located on the side of the gear selection lever away from the gear selection rocker arm, which keeps the gear selection lever moving towards the gear selection rocker arm.

6. The shifting structure as described in claim 1, characterized in that, The first meshing assembly includes a first connecting seat, a first engaging portion, and a first connecting sleeve. The first connecting seat rotates synchronously with the output shaft. The first engaging portion is connected to the first output gear and is disposed adjacent to the first connecting seat. The first connecting sleeve is connected to the first shift fork. The second engagement assembly includes a second connecting seat, a second engaging portion, a third engaging portion, and a second connecting sleeve. The second connecting seat is located between the second engaging portion and the third engaging portion and rotates synchronously with the output shaft. The second engaging portion is connected to the second output gear and is disposed adjacent to the second connecting seat. The third engaging portion is connected to the third output gear and is disposed adjacent to the second connecting seat. The second connecting sleeve is connected to the second shift fork.

7. The shifting structure as described in claim 6, characterized in that, A first bushing is provided between the first output gear and the output shaft, a second bushing is provided between the second output gear and the output shaft, and a third bushing is provided between the third output gear and the output shaft. A lubricating oil passage is provided inside the output shaft, and the lubricating oil passage is connected to the first bushing, the second bushing and the third bushing respectively through branch oil passages.

8. The shifting structure as described in claim 7, characterized in that, The diameter of the first input gear is greater than that of the second input gear, the diameter of the second input gear is greater than that of the third input gear, the second input gear is located between the first input gear and the third input gear, the diameter of the first output gear is smaller than that of the second output gear, the diameter of the second output gear is smaller than that of the third output gear, the second output gear is located between the first output gear and the third output gear, and the diameter of the third input gear is smaller than that of the first output gear.

9. The shifting structure as described in claim 8, characterized in that, Both ends of the input shaft and the output shaft are provided with bearings. The output shaft includes a main body and an output part. The main body includes a boss extending along the axial direction. The output part includes a countersunk hole corresponding to the boss. The main body and the output part are fixed by bolts.

10. A tractor, characterized in that, Includes the shifting structure as described in any one of claims 1 to 9.

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