Integrated main transmission control assembly structure and tractor

Abstract

The utility model relates to the field of tractor, more particularly to an integrated main speed change control assembly structure and tractor, and the first end and the last end of gear selecting mechanism are provided with gear selecting soft axle and gear selecting lever respectively, and the first end and the last end of gear shifting mechanism are provided with gear shifting soft axle and gear shifting lever respectively; the main speed change control lever is connected with gear selecting mechanism and gear shifting mechanism through switching assembly respectively, gear shifting lever is connected with gear shifting lever transmission, and gear shifting lever is used for driving corresponding shift fork; when the main speed change control lever swings left and right, gear selecting mechanism can drive gear shifting lever to swing left and right, and gear selecting is realized; when the main speed change control lever swings forward and backward, gear shifting mechanism can drive shift fork to swing forward and backward, and gear shifting is realized. It can be applied to semi-suspension or suspension type cab, and adapt to dynamic displacement change between cab and chassis.

Description

Technical Field

[0001] This utility model relates to the field of tractors, and more specifically, to an integrated main transmission control assembly structure and a tractor. Background Technology

[0002] With the continuous improvement of agricultural mechanization and modernization, the driving comfort of tractors is receiving increasing attention. To reduce the impact of vibration and noise on the driver, semi-floating or floating cabs are gradually being used in high-end tractor models. These cabs are connected to the chassis through elastic elements, enabling them to generate significant relative displacement during operation. The amount of change in clearance between the cab and the chassis can be 3-5 times that of traditional fixed cabs.

[0003] In traditional tractor design, the main transmission control mechanism generally employs a rigid linkage transmission. This mechanical linkage structure, by directly connecting the control lever in the cab to the chassis gearbox, offers advantages such as high transmission efficiency and clear control feedback. However, when applied to semi-floating or floating cabs, the dynamic displacement changes between the cab and chassis can cause additional stress on the linkage mechanism, potentially leading to abnormally increased operating force, shifting sticking, and in severe cases, even breakage of connecting parts. Furthermore, frequent relative motion accelerates component wear, significantly shortening the service life of the control system. Utility Model Content

[0004] The purpose of this invention is to provide an integrated main transmission control assembly structure that can be applied to semi-floating or floating cabs and adapt to dynamic displacement changes between the cab and the chassis.

[0005] Another objective of this invention is to provide a tractor whose main transmission control assembly structure can be applied to a semi-floating or floating cab to adapt to dynamic displacement changes between the cab and the chassis.

[0006] The technical solution of this utility model is implemented as follows: An integrated main transmission control assembly structure is applicable to tractors with semi-suspended or suspended cabs, which defines the forward and backward directions and the left and right directions according to the forward direction of the tractor. It includes: a main transmission control lever, a switching assembly, a gear selection mechanism, a gear shifting mechanism, and a shift fork. The gear selection mechanism is provided with a gear selection flexible shaft and a gear selection lever at its first and last ends, respectively; the gear shifting mechanism is provided with a gear shift flexible shaft and a gear shift lever at its first and last ends, respectively. The main transmission control lever is connected to the gear selection mechanism and the gear shifting mechanism respectively through the switching assembly. The gear selection lever is connected and driven by the gear shift lever, and the gear shift lever is used to move the corresponding shift fork. When the main transmission control lever swings left and right, it can drive the shift lever to swing left and right through the gear selection mechanism to achieve gear selection; when the main transmission control lever swings back and forth, it can drive the shift fork to swing back and forth through the shift mechanism to achieve gear shifting.

[0007] Furthermore, the switching assembly includes: Main transmission control bracket; A first gear selection shaft is rotatably mounted on the main transmission control bracket; A rotating bracket includes a U-shaped portion, the U-shaped portion including a middle plate and two side plates, the middle plate being rotatably connected to the main transmission control bracket via a first gear selection shaft, the rotating bracket being able to swing left and right via the first gear selection shaft, and the two side plates having shaft mounting holes in the left and right directions; The first shift shaft is rotatably installed in the shaft mounting hole, and a shift sleeve is provided on the outer side of the first shift shaft. The shift sleeve is located between the two side plates, and the bottom of the main gear control lever is fixedly connected to the shift sleeve.

[0008] Furthermore, the rotating bracket also includes a horizontal part and a connecting part, the horizontal part is disposed below the U-shaped part, and the horizontal part is connected to the U-shaped part through the connecting part; A bracket is provided on the main transmission control bracket and below the horizontal part. A buffer spring is connected between the bracket and the horizontal part, and a limiting post is vertically provided on the bracket. The lower part of the buffer spring is located outside the limiting post.

[0009] Furthermore, the gear selection mechanism includes a gear selection flexible shaft, a first gear selection rocker arm, a gear selection linkage, a second gear selection rocker arm, a second gear selection rotating shaft, and a gear selection lever connected in sequence for transmission; The first end of the gear selection flexible shaft is connected to the first gear shifting shaft via a spherical bearing, and the second end is rotatably connected to the first gear selection rocker arm via a pin assembly.

[0010] Furthermore, the shifting mechanism includes a shift lever rocker arm, a shift flexible shaft, a first shift rocker arm, a shift linkage, a second shift rocker arm, a second shift rotating shaft, and a shift lever connected in sequence for transmission. The first end of the shift flexible shaft is connected and fixed to the bottom end of the main transmission control lever or the shift shaft sleeve via the shift lever rocker arm.

[0011] Furthermore, it also includes a rocker arm support; The rocker arm bracket is provided with a third gear selection shaft and a third gear shifting shaft. The first gear selection rocker arm is fixedly connected to the third gear selection shaft. The third gear selection shaft is also provided with a third gear selection rocker arm. The third gear selection rocker arm is connected to the second gear selection rocker arm through the gear selection linkage. The first shift rocker arm is fixedly connected to the third shift shaft, and the third shift shaft is also provided with a third shift rocker arm. The third shift rocker arm is connected to the second shift rocker arm through the shift linkage.

[0012] Furthermore, this also includes manipulating the sub-assemblies; The control subassembly includes a housing and a second gear selection shaft, a gear selection lever, a second shift shaft, and a shift lever disposed within the housing. The second shift rocker arm is connected to the second shift shaft, and the second shift shaft is connected to the shift lever via a locking pin. An axial compression spring is provided between the shift lever and the second shift shaft. The shift lever is provided with a toggle part, which is used to aggle different shift fork shafts to select gears.

[0013] Furthermore, the first gear selection shaft, the gear selection flexible shaft, the first gear selection rocker arm, and the first gear shift shaft, the gear shift flexible shaft, and the first main gear shift rocker arm are located on one side of the tractor cab; The second gear selector rocker arm, the second gear selector shaft, and the second gear shift rocker arm and the second gear shift shaft are located on one side of the tractor chassis.

[0014] Furthermore, a gear selection sleeve is provided on the first gear selection shaft.

[0015] A tractor including the aforementioned integrated main transmission control assembly structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This application provides an integrated main transmission control assembly structure. The main transmission control lever is connected to the gear selection mechanism and the shifting mechanism respectively through a switching assembly. When the main transmission control lever swings left and right, it can drive the gear selection mechanism through the switching assembly, and the gear selection mechanism can drive the shift lever to swing left and right to achieve gear selection. When the main transmission control lever swings back and forth, it can drive the shifting mechanism through the switching assembly, and the shift lever of the shifting mechanism can drive the shift fork to swing back and forth to achieve gear shifting. Because the gear selection and shifting flexible shafts themselves can undergo flexible bending deformation, they can adapt to the suspension amount of the semi-suspended or suspended cab and adapt to the dynamic displacement changes between the cab and the chassis, thus making them suitable for tractors with semi-suspended or suspended cabs. In addition, the bending flexibility of the gear selection and shifting flexible shafts can offset vibration, avoid the transmission of vibration between the transmission components of the main transmission control assembly structure, reduce noise and failure rate, and improve operating comfort. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of the integrated main transmission control assembly of this utility model; Figure 2 This is a schematic diagram of the integrated main transmission control assembly structure from another perspective. Figure 3 This is a front view of the integrated main transmission control assembly structure of this utility model; Figure 4 This is a right view of the integrated main transmission control assembly structure of this utility model; Figure 5 This is a top view of the integrated main transmission control assembly structure of this utility model; Figure 6 This is a schematic diagram of the internal structure of the control subassembly of this utility model; Figure 7 This is a cross-sectional view of the control sub-assembly of this utility model; Figure 8 This is a partial structural diagram of the switching assembly of this utility model.

[0019] In the picture: 1-Main transmission control lever; 2-First shift shaft; 3-Shift shaft sleeve; 4-Rotating bracket; 401-U-shaped part; 4011-Intermediate plate; 4012-Side plate; 4013-Shaft mounting hole; 402-Horizontal part; 403-Connecting part; 5-First gear selector shaft; 6-Gear selector bushing; 7-Main transmission control bracket; 701-Bracket; 8-Gear selector flexible shaft; 9-Gear shift lever rocker arm; 10-Gear shift flexible shaft; 11-Gear selection linkage; 12-Gear shift linkage; 13-First gear selection rocker arm; 14-First shift rocker arm; 15-Rocker arm bracket; 16-Second shift rocker arm; 17-Second shift rocker arm; 18-Control sub-assembly; 19-Second shift shaft; 20-Second gear selector shaft; 21-Shift fork shaft; 22-Shift fork; 23-Gear selector lever; 24-Locking pin; 25-Axial compression spring; 26-Gear shift lever; 2601-Actuating part; 27-Buffer spring; 28-Third gear selector rocker arm; 29-Third gear shift rocker arm; 30-Limit post; 31 - Third gear selector shaft; 32 - Third gear shift shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0026] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1 Reference Figures 1-8 This embodiment provides an integrated main transmission control assembly structure, which is suitable for tractors with semi-suspended or suspended cabs. The forward and backward directions and left and right directions are defined according to the forward direction of the tractor. It includes: main transmission control lever 1, switching assembly, gear selection mechanism, gear shifting mechanism and shift fork 22. The gear selection mechanism is provided with a gear selection flexible shaft 8 and a gear selection lever 23 at its first and last ends, respectively; the gear shifting mechanism is provided with a gear shift flexible shaft 10 and a gear shift lever 26 at its first and last ends, respectively. The main transmission control lever 1 is connected to the gear selection mechanism and the gear shifting mechanism respectively through the switching assembly. The switching assembly is used to drive the gear selection mechanism and the gear shifting mechanism respectively when the main transmission control lever 1 swings left and right or back and forth. The gear selection lever 23 is connected to the gear shift lever 26 for transmission, and the gear shift lever 26 is used to move the corresponding shift fork 22. When the main transmission control lever 1 swings left and right, it can drive the shift lever 26 to swing left and right through the gear selection mechanism to achieve gear selection; when the main transmission control lever 1 swings back and forth, it can drive the shift fork 22 to swing back and forth through the gear shift mechanism to achieve gear shifting.

[0028] Specifically, the assembly switching includes: The main transmission control bracket 7 is located on the side of the tractor cab; The first gear selection shaft 5 is rotatably mounted on the main transmission control bracket 7, and the first gear selection shaft 5 is axially limited by a limiting component. The first gear selection shaft 5 is also provided with a gear selection bushing 6. The rotating bracket 4 includes a U-shaped part 401, a horizontal part 402, and a connecting part 403. The U-shaped part 401 includes a middle plate 4011 and two side plates 4012 on both sides. The middle plate 4011 is rotatably connected to the main transmission control bracket 7 through a first gear selection shaft 5. The rotating bracket 4 can swing left and right through the first gear selection shaft 5. The two side plates 4012 have shaft mounting holes 4013 in the left and right directions. The horizontal part 402 is provided below the U-shaped part 401, and the horizontal part 402 is fixedly connected to the middle plate 4011 of the U-shaped part 401 through the connecting part 403. The first shift shaft 2 passes through and is rotatably mounted in the two shaft mounting holes 4013. Limiting members are provided at both ends of the first shift shaft 2 to limit its axial movement. The axial direction of the first shift shaft 2 is left and right. A shift sleeve 3 is provided on the outer side of the first shift shaft 2 and is located between the two side plates 4012. The bottom of the main gear shift lever 1 is fixedly connected to the shift sleeve 3.

[0029] A bracket 701 is mounted on the main transmission control bracket 7 and located below the horizontal part 402. A buffer spring 27 is connected between the bracket 701 and the horizontal part 402, and a limiting post 30 is vertically mounted on the bracket 701. The lower part of the buffer spring 27 is located outside the limiting post 30. A spring groove is also formed at the bottom of the horizontal part 402 to accommodate the buffer spring 27 and to radially limit the buffer spring 27. The spring groove is a circular groove, and the diameter of the spring groove is the same as the outer diameter of the top end of the buffer spring 27, so that the buffer spring 27 is perfectly fitted into the spring groove.

[0030] The gear selection mechanism includes a gear selection flexible shaft 8, a first gear selection rocker arm 13, a gear selection connecting rod 11, a second gear selection rocker arm 16, a second gear selection rotating shaft 20, and a gear selection lever 23, which are connected in sequence for transmission. The first end of the gear selection flexible shaft 8 is connected to the first gear shift shaft 2 via a spherical bearing, and the second end is rotatably connected to the first gear selection rocker arm 13 via a pin assembly.

[0031] The shifting mechanism includes a shift lever rocker arm 9, a shift flexible shaft 10, a first shift rocker arm 14, a shift connecting rod 12, a second shift rocker arm 17, a second shift rotating shaft 19, and a shift lever 26, which are connected in sequence for transmission. The first end of the shift flexible shaft 10 is connected and fixed to the bottom end of the main transmission control lever 1 or the shift shaft sleeve 3 via the shift lever rocker arm 9.

[0032] The integrated main transmission control assembly structure also includes a rocker arm bracket 15 and a control sub-assembly 18; A third gear selection shaft 31 and a third gear shift shaft 32 are provided on the rocker arm bracket 15. The third gear selection shaft 31 and the third gear shift shaft 32 are rotatably mounted on the rocker arm bracket 15, and the two ends of the third gear selection shaft 31 and the two ends of the third gear shift shaft 32 are axially limited by limiting members. The first gear selection rocker arm 13 is fixedly connected to the third gear selection shaft 31. The third gear selection shaft 31 is also provided with a third gear selection rocker arm 28. The third gear selection rocker arm 28 is connected to the second gear selection rocker arm 16 through the gear selection linkage 11. The first gear selection rocker arm 13 can drive the third gear selection shaft 31 to rotate and drive the third gear selection rocker arm 28, and then drive the second gear selection rocker arm 16 through the gear selection linkage 11.

[0033] The first shift rocker arm 14 is fixedly connected to the third shift shaft 32. The third shift shaft 32 is also provided with a third shift rocker arm 29. The third shift rocker arm 29 is connected to the second shift rocker arm 17 through the shift linkage 12. The first shift rocker arm 14 can drive the third shift shaft 32 to rotate and drive the third shift rocker arm 29, and then drive the second shift rocker arm 17 through the shift linkage 12.

[0034] The control assembly 18 includes a housing and a second gear selection shaft 20, a gear selection lever 23, a second gear shift shaft 19, and a gear shift lever 26 disposed within the housing. Figure 1 and Figure 7 As shown, the second shift rocker arm 17 is connected to the second shift shaft 19. The second shift shaft 19 is connected to the shift lever 26 via a locking pin 24. An axial compression spring 25 is provided between the shift lever 26 and the second shift shaft 19. The shift lever 26 is provided with a toggle part 2601, which is used to aggle different shift fork shafts 21 to select gears. The second shift rocker arm 17 is connected to the shift lever 26 via the second shift shaft 19 and the locking pin 24. The shift lever 26 is aligned with the groove of the shift fork shaft 21. The shift fork 22 is set on the shift fork shaft 21. The shift fork shaft 21 and the shift fork 22 are connected by hexagon socket bolts. (The shift lever 26 is in the groove of the shift fork shaft 21. By driving the shift lever 26 to different positions, different shift fork shafts 21 and shift forks 22 can be driven. This is existing technology and common knowledge, and the specific structure will not be described in detail.)

[0035] The first gear selection shaft 5, the gear selection flexible shaft 8, the first gear selection rocker arm 13, the first gear shift shaft 2, the gear shift flexible shaft 10, and the first gear shift rocker arm 14 are located on one side of the tractor cab; The second gear selector rocker arm 16, the second gear selector shaft 20, the second gear shift rocker arm 17, and the second gear shift shaft 19 are located on one side of the tractor chassis.

[0036] When a gear shift is needed, first manipulate the main transmission control lever 1 to swing left and right, which in turn drives the rotating bracket 4 to swing left and right around the first gear selection shaft 5, thereby pulling the gear selection flexible shaft 8. Then, the first gear selection rocker arm 13, the gear selection linkage 11, the third gear selection rocker arm 28, and the second gear selection rocker arm 16 swing back and forth under the action of the gear selection flexible shaft 8, which in turn drives the second gear selection shaft 20 and the gear selection lever 23 to swing. The shift lever 26 swings left and right under the action of the shift lever 23, aligning with the groove of the corresponding shift fork shaft 21. There are three shift fork shafts 21 in total. When the shift lever 26 is in different shift fork shafts 21... When the gear selector is in the groove of gear 1 and different shift fork shafts 21 are moved, gear selection is achieved for gears 1-6. After gear selection is completed, the main gear control lever 1 drives the shift rocker arm 9 to swing back and forth through the shift shaft sleeve 3 and the first shift shaft 2, which in turn pulls the shift flexible shaft 10. Then, the first shift rocker arm 14, the shift linkage 12, the third shift rocker arm 29, and the second shift rocker arm 17 swing back and forth under the drive of the shift flexible shaft 10, which in turn drives the second shift shaft 19 to drive the shift lever 26 to swing back and forth through the locking pin 24, which in turn drives the shift fork shaft 21 to move back and forth, thus completing the gear shift.

[0037] Example 2 A tractor including the aforementioned integrated main transmission control assembly structure.

[0038] This solution introduces an integrated main transmission control assembly structure for tractors. Its core function is to allow the driver to shift gears in the cab using a control lever. It can be used stably, especially in semi-floating or floating cabs where there is a large displacement change between the cab and the chassis.

[0039] This solution uses an indirect control method with a gear selection flexible shaft 8 and a gear shift flexible shaft 10, which avoids the problems caused by rigid connection. The flexible shaft has a certain degree of flexibility and extensibility, which can adapt to the displacement changes between the cab and the chassis, thereby ensuring stable and reliable gear shifting operation.

[0040] The beneficial effects of the technical solution of this utility model are: In simple terms, traditional methods use rigid linkages to connect the cab control levers and the chassis transmission. However, when the cab is a suspended or semi-suspended structure, the relative movement between the cab and the chassis can cause the rigid linkages to malfunction or even be damaged. The integrated main transmission control assembly provided in this solution indirectly controls the transmission in the tractor chassis through the selection flexible shaft 8 and the shift flexible shaft 10. Because the selection flexible shaft 8 and the shift flexible shaft 10 can flexibly bend and deform, they can adapt to the suspension amount of a semi-suspended or suspended cab and the dynamic displacement changes between the cab and the chassis. This makes it suitable for tractors with semi-suspended or suspended cabs, ensuring that the movement of the main transmission control lever 1 is accurately transmitted to the chassis transmission device. This allows the cab to stably and accurately control the transmission even when it is floating up and down, improving driving comfort and operational reliability. Furthermore, the bending flexibility of the selection flexible shaft 8 and the shift flexible shaft 10 can offset vibrations, preventing the transmission of vibrations between the transmission components of the main transmission control assembly, reducing noise and failure rates, and improving operating comfort.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated main transmission control assembly structure, suitable for tractors with semi-suspended or suspended cabs, defining the forward and backward directions and the left and right directions according to the tractor's forward direction, characterized in that, include: Main transmission control lever (1), switching assembly, gear selection mechanism, gear shifting mechanism and shift fork (22); The gear selection mechanism is provided with a gear selection flexible shaft (8) and a gear selection lever (23) at its first and last ends, respectively, and the gear shifting mechanism is provided with a gear shift flexible shaft (10) and a gear shift lever (26) at its first and last ends, respectively. The main transmission control lever (1) is connected to the gear selection mechanism and the gear shifting mechanism respectively through the switching assembly. The gear selection lever (23) is connected to the gear shift lever (26) for transmission, and the gear shift lever (26) is used to move the corresponding shift fork (22). When the main transmission control lever (1) swings left and right, it can drive the shift lever (26) to swing left and right through the gear selection mechanism to achieve gear selection; when the main transmission control lever (1) swings back and forth, it can drive the shift fork (22) to swing back and forth through the gear selection mechanism to achieve gear shifting.

2. The integrated main transmission control assembly structure according to claim 1, characterized in that, The switching assembly includes: Main transmission control bracket (7); The first gear selection shaft (5) is rotatably mounted on the main transmission control bracket (7). The rotating bracket (4) includes a U-shaped part (401), the U-shaped part (401) includes a middle plate (4011) and two side plates (4012) on both sides. The middle plate (4011) is rotatably connected to the main transmission control bracket (7) through the first gear selection shaft (5). The rotating bracket (4) can swing left and right through the first gear selection shaft (5). The two side plates (4012) have shaft mounting holes (4013) in the left and right directions. The first shift shaft (2) is rotatably installed in the shaft mounting hole (4013), and a shift sleeve (3) is provided on the outer side of the first shift shaft (2), and the shift sleeve (3) is located between the two side plates (4012). The bottom of the main gear shift lever (1) is fixedly connected to the shift sleeve (3).

3. The integrated main transmission control assembly structure according to claim 2, characterized in that, The rotating bracket (4) further includes a horizontal part (402) and a connecting part (403). The horizontal part (402) is disposed below the U-shaped part (401), and the horizontal part (402) is connected to the U-shaped part (401) through the connecting part (403). A bracket (701) is provided on the main transmission control bracket (7) and below the horizontal part (402). A buffer spring (27) is connected between the bracket (701) and the horizontal part (402). A limiting post (30) is vertically provided on the bracket (701), and the lower part of the buffer spring (27) is located outside the limiting post (30).

4. The integrated main transmission control assembly structure according to claim 3, characterized in that, The gear selection mechanism includes a gear selection flexible shaft (8), a first gear selection rocker arm (13), a gear selection linkage (11), a second gear selection rocker arm (16), a second gear selection rotating shaft (20), and a gear selection lever (23) connected in sequence for transmission. The first end of the gear selection flexible shaft (8) is connected to the first gear shifting shaft (2) through a joint bearing, and the last end is rotatably connected to the first gear selection rocker arm (13) through a pin assembly.

5. The integrated main transmission control assembly structure according to claim 4, characterized in that, The shifting mechanism includes a shifting rocker arm (9), a shifting flexible shaft (10), a first shifting rocker arm (14), a shifting connecting rod (12), a second shifting rocker arm (17), a second shifting rotating shaft (19), and a shift lever (26) connected in sequence for transmission. The first end of the shift flexible shaft (10) is connected and fixed to the bottom end of the main transmission control lever (1) or the shift sleeve (3) through the shift lever rocker arm (9).

6. The integrated main transmission control assembly structure according to claim 5, characterized in that, It also includes a rocker arm bracket (15); The rocker arm bracket (15) is provided with a third gear selection shaft (31) and a third gear shifting shaft (32). The first gear selection rocker arm (13) is fixedly connected to the third gear selection shaft (31). The third gear selection shaft (31) is also provided with a third gear selection rocker arm (28). The third gear selection rocker arm (28) is connected to the second gear selection rocker arm (16) through the gear selection connecting rod (11). The first shift rocker arm (14) is fixedly connected to the third shift shaft (32), and the third shift shaft (32) is also provided with a third shift rocker arm (29), which is connected to the second shift rocker arm (17) through the shift linkage (12).

7. The integrated main transmission control assembly structure according to claim 5, characterized in that, It also includes the control sub-assembly (18); The control subassembly (18) includes a housing and a second gear selection shaft (20), a gear selection lever (23), a second gear shift shaft (19), and a gear shift lever (26) disposed within the housing. The second gear shift rocker arm (17) is connected to the second gear shift shaft (19). The second gear shift shaft (19) is connected to the gear shift lever (26) via a locking pin (24). An axial compression spring (25) is provided between the gear shift lever (26) and the second gear shift shaft (19). The gear shift lever (26) is provided with a toggle part (2601), which is used to toggle different shift fork shafts (21) to achieve gear selection.

8. The integrated main transmission control assembly structure according to claim 5, characterized in that, The first gear selection shaft (5), the gear selection flexible shaft (8), the first gear selection rocker arm (13), the first gear shift shaft (2), the gear shift flexible shaft (10), and the first gear shift rocker arm (14) are located on one side of the tractor cab; The second gear selector rocker arm (16), the second gear selector shaft (20), the second gear shift rocker arm (17), and the second gear shift shaft (19) are located on one side of the tractor chassis.

9. The integrated main transmission control assembly structure according to claim 2, characterized in that, A gear selection bushing (6) is provided on the first gear selection shaft (5).

10. A tractor, characterized in that, Includes the integrated main transmission control assembly structure as described in any one of claims 1-9.

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